Forum Posts

• August 19, 2022 11:57 AM +05

  in the topic Lin Zhenggang: How important are the two in the forum News and Announcements

  Original title: Lin Zhenggang: How important are the two L's? Last night's small kitchen finally ushered in a "breakthrough". The importance of the "two Ls" has always been emphasized, but the students who have not yet started do not understand it. I guess most people are still "watching the fun",mining dth bit, but last night I finally saw the "breakthrough" of the two Ls. The problem of the two L's is where to find "possible customers". In the process of finding possible customers, the easiest pit for everyone to step on is "overreach". Everyone will say that "the market out of reach is poison",dth rock bit, but in practice, everyone starts their own "fantasy" machine, and the behavior of "thinking is reaching" is everywhere. The most reliable description comes from Peng Zong,Borehole Drill Bits, who said that there have been only more than 40 customers in recent years, and now more than 100 customers can be "confirmed". This figure ratio is reliable, because more than 100 customers can indeed be "reached", and the possibility of customers is two or three times that of target customers, which is a 300-200% coverage. This coverage should ensure that there is a basis for "customer optimization". If the L2C of the enterprise is like mining equipment, the ability of the two L is the mining drill bit of the mining equipment. If the drill bit is not sharp enough, it can only find diamond powder in the original stone. At present, the whole L2C process has been detailed enough, and the commit report version can fully cooperate. Now we need to learn to "focus",Tapered Rock Bit, find a reasonable proportion of "possible customers/target customers", and let the whole process run. This is the first step of "where to hit where". Okay, that's all for today. Everyone is welcome to give feedback in the comments section! Return to Sohu to see more Responsible Editor:. wt-dthtools.com 
• August 19, 2022 11:57 AM +05

  in the topic See how Wassara, a mining company in the forum News and Announcements

  Original title: See how Wassara, a mining company, uses metal 3D printing to solve deep drilling problems? The mining industry needs new drilling solutions to cope with increasing cost versus benefit pressures. Compared with the current drilling scheme, the new scheme is not only more environmentally friendly, but also more economically advantageous. Many existing underground mines are close to the limit of mining depth, so it is difficult to ensure the controllability of various costs by current drilling methods. The new deposits are deeper and less productive. The combination of various factors requires mining enterprises to realize the rational planning and large-scale exploitation of mineral resources, so the adoption of more efficient and accurate drilling methods has become an inevitable choice. Background Wassara, a mining equipment company from Sweden, has a number of innovative products that minimize the negative impact on the environment while mining ore. Wassara's core technology is a down-the-hole (DTH) hammer driven by a high-pressure water jet. Wassara's hydraulic down-the-hole hammer is the most environmentally friendly method of percussive drilling available. Dth hammers are driven by high-pressure water jets and do not use grease for lubrication, so they do not pollute the air or groundwater. In addition, high-pressure water is effective in suppressing dust. The incompressibility of water is a key factor in the efficient operation of the Wassara Dth hammer. Wassara's technology results in significant energy cost savings compared to relatively conventional pneumatic Dth hammer technology because less energy is required to drive a hydraulic Dth hammer. High pressure water was selected by Wassara as the transmission medium due to its ability to drive the hammer to produce high frequency, high energy impact motion. In addition, when the flow leaves the hammer, it is fast enough to bring the drilled core and debris back to the surface and clean the hole. This technology has many excellent advantages, such as high drilling efficiency, good borehole quality, and strong wall protection ability for drilling rock formation. With the addition of liquid drive Dth hammer technology, mining enterprises have more choices when choosing the most suitable mining method for ore body characteristics, which is regarded as a big step towards scientific mining. Expand the full text Challenge Each down-the-hole hammer is made up of a number of complex components. The core component of the down-the-hole hammer is a sliding shell which provides two-way high-pressure water diversion for the piston assembly, dth drilling hammer , and the inside of the shell requires a plurality of high-pressure water flow holes; due to the complexity of the design, a plurality of processed parts must be jointed together to manufacture a complete shell. The complex design also makes the component relatively expensive to manufacture. In addition, the total cost of ownership of the down-the-hole hammer is further increased by the frequent occurrence of non-conforming products during the joining process, as well as equipment failures due to component wear or pitting during use, which increases maintenance costs. Solutions Wassara approached Renishaw to find out whether additive manufacturing (AM) technology could be a suitable alternative manufacturing solution in order to reduce costs and improve the reliability of sliding enclosure components. One of the significant advantages of metal additive manufacturing is the ability to combine discrete parts into a complex 3D geometry and simplify the processing steps, for example, when processing cross-holes requiring blind plugs or welding at one end. When there is no significant difference in design between the components manufactured by additive method and the components manufactured by traditional method, they can be tested in the same application environment, and the results can be used as an ideal basis for verifying the usability of metal additive components. A detailed comparison of the performance of the two types of components under standard test conditions, with any significant differences in the results directly attributable to changes in manufacturing technology. The geometry of the Wassara sliding enclosure has been redesigned to incorporate the benefits of additive manufacturing in terms of design freedom. The next challenge to overcome with a metal additive manufacturing solution is the use of the appropriate metal alloy for the particular application. In this case, the component originally used standard alloy steel 527 M20, an alloy structural steel that would not normally be used for metal additive manufacturing due to its medium carbon content.The alloy steel more suitable for additive manufacturing is 316L stainless steel. However, although this alloy steel has better corrosion resistance, it is not expected to guarantee sufficient corrosion and erosion resistance during service. Another alternative proposed by Renishaw was to produce test parts using maraging alloy steels. Maraging steels are age-hardening tool steels with a wide range of applications; they can be heat treated to obtain material properties tailored to the requirements of specific applications by adjusting the process temperature. This is the first test and application of this type of steel in the field of mining, so the sliding shell was heat treated after machining to ensure maximum hardness. Result To test the performance of the additive sliding shell, Wassara assembled it into a complete down-the-hole hammer for test use under standard mining conditions, i.e., drilling a typical long passage hole in a selected rock face. Routine visual inspection and maintenance of the down-the-hole hammer followed, and the additively manufactured sliding housing showed no signs of pitting and minimal wear compared to the conventional housing. The down-the-hole hammer was then reassembled and more drilling operations continued. Upon completion of the above work, Wassara performed a second inspection of the additively manufactured sliding enclosure and found that there were indeed some signs of wear, but other than that, there was no pitting on the surface of the component (the second most common cause of equipment failure). A third drill test was then carried out by Wassara,dth button bits, this time for a duration well beyond the normal Dth hammer cycle, in order to establish as far as possible whether there was any evidence of pitting, but there was still no pitting. This leads to the preliminary conclusion that additive components made of maraging steel have superior potential pitting resistance compared to conventional sliding enclosures made of standard alloy steel. Return to Sohu to see more Article Source: Renishaw Responsible Editor:. wt-dthtools.com
• August 19, 2022 11:56 AM +05

  in the topic The most complete knowledge of open-pit in the forum News and Announcements

  Original title: The most complete knowledge of open-pit mines has been collected by miners! Strip mining is the extraction of valuable minerals from open pits. Mechanical mining: mining hard ore and rock, with deep-hole blasting and mechanical mining as the main means to obtain ore. Manual mining: Prohibited by An Wei Ban No.17 Civilization Order. Simulated appearance of open pit 1. Classification of closed circle and open-pit mine Closed circle: the plane closed curve of the surface of the open pit. It can be divided into hillside open-pit mine and sunken open-pit mine according to the topographic conditions of deposit burial and the surface closed circle of open-pit mining boundary. Above the surface closed circle of the hillside open-pit mine; Below the surface closed circle of the sunken open-pit mine. Expand the full text Sketch map of hillside open pit and sunken open pit A — hillside open-pit mine, B — sunken open-pit mine, 1 — elevation of surface closed circle 2. Three elements of open-pit mine Bench: The ore rock is divided into horizontal layers of a certain thickness, and the working levels form a ladder shape in space during the mining process. Each step is called a step, and its height becomes the step height. Bench slope: the inclined surface on the side of the bench facing the goaf. The angle between the inclined plane and the horizontal plane is called the bench slope angle. Platform (flat plate): The space on the horizontal plane between the slope bottom line and the slope top line of the step. The width between the slope bottom line and the slope top line is called the platform width. The platform for blasting, shoveling and transportation operations is called the working platform. The width between the blasting pile edge and the slope top line is called the working platform height. The platform for intercepting sliding rocks is called safety (cleaning) platform. 3. Mining technology of open-pit mine The mining technology of open-pit mine is relatively simple, mainly including drilling, blasting, mining, loading and transportation, and rock dumping. Next, we will talk about the mining technology of open-pit mines in detail. I. Perforation work Perforation is the first working procedure of open pit mining. In the whole process of open pit mining, the cost of perforation accounts for about 10%-15% of the total production cost. 1. Down-the-hole drill The down-the-hole drilling machine has the advantages of large drilling angle change range, high mechanization degree, reduction of auxiliary operation time, improvement of the operation rate of the drilling machine, flexibility of the down-the-hole drilling machine, light equipment weight and low investment cost, and particularly can control the ore grade by drilling various inclined holes, eliminate toes, reduce large blocks and improve the blasting quality. Therefore, the down-the-hole drill is widely used in small and medium-sized mines at home and abroad, which is suitable for medium hard rock drilling. 2. Rotary drill Rotary drilling rig is a new type of drilling equipment developed on the basis of rotary drilling rig, which has the characteristics of high drilling efficiency, low operation cost,rock drilling tools, high degree of mechanization and automation, and is suitable for drilling operations of various hardness of ore and rock. At present, it has become a common drilling equipment used in open-pit mines all over the world. 3. Rock drilling jumbo Drill jumbo is a new type of drilling equipment with the development of mining industry. One or a plurality of rock drills are arranged on a special drill boom or a rack together with an automatic propeller, and a traveling mechanism is arranged, so that the operation of the rock drill is mechanized. II. Blasting work The purpose of blasting work is to break the hard solid ore rock and provide the excavation material with appropriate size for mining and loading work. In the total cost of open-pit mining, blasting cost accounts for about 15% -20%. The quality of blasting not only directly affects the efficiency of mining, transportation, coarse crushing and other equipment, but also affects the total cost of the mine. 1. Shallow hole blasting The diameter of the hole used in shallow hole blasting is small, generally about 30-75 mm,Borehole Drill Bits, and the depth of the hole is generally less than 5 meters, sometimes up to about 8 meters. If the drilling jumbo is used for drilling, the depth of the hole can be increased. Shallow-hole blasting is mainly used for the excavation of open-pit mines or quarries, caverns and tunnels with small production scale, secondary blasting, the treatment of new open-pit mine hills, the formation of hillside open-pit single-wall ditch transportation channels and other special blasting. 2. Deep-hole blasting Deep-hole blasting is a blasting method that uses drilling equipment to drill deeper boreholes as the charging space of mining explosives. The deep-hole blasting of open-pit mine is mainly the production blasting of bench. Drilling equipment for deep-hole blasting mainly includes down-the-hole drill and roller drill. It can be used to drill vertical deep holes or inclined blast holes.The charging of inclined blast holes is more uniform, and the blasting quality of ore and rock is better, which creates good conditions for mining and loading work. In order to reduce the seismic effect and improve the blasting quality, such measures as millisecond blasting in large area, interval charging in blastholes or bottom air interval charging can be taken under certain conditions, so as to reduce the blasting cost and obtain better economic benefit. 3. Chamber blasting Chamber blasting is a blasting method in which more or a large amount of explosives are loaded in the tunnel of the blasting chamber. Open-pit mines are used only during the capital construction period and under specific conditions, and quarries are used when conditions permit and when the demand for mining is high. 4. Multi-row hole millisecond blasting method In recent years, with the rapid increase of the excavator bucket capacity and the production capacity of the open-pit mine, the normal excavation blasting of the open-pit mine requires more and more blasting quantity each time. Therefore, large-scale blasting methods such as multi-row-hole millisecond blasting and multi-row-hole millisecond extrusion blasting are widely used in open-pit mining at home and abroad. Advantages of multi-row millisecond blasting: The blasting quantity at one time is large, the blasting times and the blasting avoidance time are reduced, and the utilization rate of the stope equipment is improved The broken quality of ore and rock is improved, Mining Drilling Equipment ,Tapered Rock Bit, and the large block rate is reduced by 40% -50% compared with the single-row hole blasting. The efficiency of perforating equipment is increased by about 10% -15%, which is due to the increase of working time utilization factor and the decrease of the number of operations of perforating equipment and filling area after blasting. Improve the efficiency of mining and transportation equipment by about 10% -15%. 5. Multi-row hole differential extrusion blasting method It refers to the multi-row millisecond blasting in the case of residual muckpile in the working face. The existence of the muck pile creates conditions for extrusion. On the one hand, it can prolong the effective action time of blasting and improve the utilization of explosive energy and crushing effect; on the other hand, it can control the width of the muck pile and avoid the scattering of ore and rock. The millisecond interval of multi-row hole millisecond extrusion blasting should be 30% ~ 50% longer than that of ordinary millisecond blasting, and 50 ~ 100ms is often used in open-pit mines in China. The advantages of multi-row hole millisecond extrusion blasting are as follows: (1) The ore rock crushing effect is better. This is mainly because the front is blocked by the slag heap, and each row of boreholes, including the first row, can increase the charge and be fully crushed under the extrusion of the slag heap; (2) The muckpile is more concentrated. For mines using railway transportation, the road can not be removed before blasting, so as to improve the efficiency of mining, loading and transportation equipment. The disadvantages of multi-row hole millisecond extrusion blasting are that the consumption of explosive is large, the working platform is required to be wider to accommodate the muck pile, and the height of the muck pile is large, which may affect the safety of excavator operation. III. Blasting measures near the slope With the downward extension of open-pit mine, the problem of slope stability has become increasingly prominent. In order to protect the slope, the blasting near the slope should be strictly controlled. According to the experience at home and abroad, the main measures are millisecond blasting, presplitting blasting and smooth blasting. 1. Adopt millisecond blasting to reduce vibration One of the main functions of millisecond blasting is to reduce the seismic effect of blasting. In order to give full play to the shock absorption effect of millisecond blasting, the key is to try to increase the number of blasting segments and control the millisecond interval. 2. Adopt presplitting blasting to isolate the slope. The presplitting blasting near the slope is to drill a row of dense parallel boreholes along the slope boundary, fill each hole with a small amount of explosives, and detonate before the excavation zone is blasted, so as to obtain a crack with a certain width and running through each borehole. Due to the separation of the excavation zone from the slope by the pre-fracture, the seismic wave of the subsequent excavation blasting will produce a strong reflection on the fracture surface, which will greatly reduce the seismic wave passing through it, thus protecting the slope. 3. Adopt smooth blasting to protect the slope. Smooth blasting near the slope is to drill a row of dense parallel boreholes along the boundary line, fill a small amount of explosives in the holes, and then blast after the excavation of boreholes, so as to form parallel rock walls along the dense boreholes. The difference between smooth blasting and presplitting blasting lies mainly in the initiation time. The initiation of the smooth blasthole is later than that of the previous rows of excavation holes, usually 50 to 75 ms later. In addition, another measure is to control the blasting of the last few rows of boreholes. The explosive quantity and resistance line of the last rows of boreholes near the slope should be reduced, which is called "buffer blasting", which can reduce the damage of drilling blasting to the slope.IV. Purchase, loading and transportation Mining and loading operation is to use loading machinery to excavate ore rock directly from the ground or blasting pile, and load it into the carriage of transport machinery or unload it directly to the designated place. It is the central link in the process of open-pit mining, and other production processes such as drilling and blasting, transportation and so on serve for mining and loading. Main mining and loading equipment: excavator, dragline, hydraulic shovel and rubber-tyred front loader. In the process of open-pit mining, the capital construction investment of mine transportation accounts for about 60% of the total investment of mine capital construction, and the transportation cost and labor volume account for more than half of the total ore cost and labor volume respectively, which shows the important position of transportation in open-pit mining. Transportation modes of open-pit mines: automobile transportation, railway transportation, belt transportation, slope skip lifting transportation and combined transportation, among which dump truck transportation is the most common. Mining and transportation are inseparable, and they influence and restrict each other. At present, the development trend of mining and transportation technology is mainly reflected in the large-scale of mining and transportation equipment, the integration and continuity of mining, loading and transportation links, and computer automation. 5. Rock discharge Rock dumping is the operation of the transport terminal, which transports the stripped topsoil and waste rock to the waste rock yard for disposal. Rock dumping process: rock dumping by railway transportation, road transportation and belt transportation 6. Dump Waste dump (waste rock dump): a place where stripped materials are piled up, which refers to the place where mining wastes are discharged in a centralized manner. According to the stacking sequence, the dump can be divided into single-bench dump, covering multi-bench dump and slope-pressing multi-bench dump. The dump is mainly divided into road transport dump, railway transport dump, belt transport dump and hydraulic transport dump according to the dumping process. Source: Mining Engineering Disclaimer: The content contained in this article is online information, and the copyright owner cannot be contacted. If there is infringement in the text and pictures of the article,fastest dth hammer, please contact the public number operator, WeChat ID: zjks2016, and we will delete it! Return to Sohu to see more Responsible Editor:. wt-dthtools.com
• August 19, 2022 11:55 AM +05

  in the topic The hardest metal VS the strongest in the forum News and Announcements

  Original title: The hardest metal VS the strongest drill bit, the process is so wonderful, the result is a big surprise! In Fukuoka Prefecture, Japan, there is a company called Tungsten Company, which claims to produce the hardest metal in the world, and no drill can drill holes in it. Words are full, afraid of breaking the tongue. A Japanese company that produces drill bits is not convinced. The result is that under the witness of the media, the two sides openly PK. The rule is a 20mm thick square metal. If a hole is successfully drilled through, it is the victory of the drill bit. If it can not be drilled through, it is the victory of the metal. The result is frustrating. The strongest metal that talks big is really superior. The blade of the super-hard alloy drill bit is damaged, but the metal is not damaged. However, the matter is not over,mining drill bit, the major enterprises in the drilling industry have come to challenge one after another, and have fought a total of six battles. The result of 2 to 6 battles: In the second battle, the diamond abrasive particles of the drill bit peeled off. The metal is cut to some extent. In the third battle, the blade of the super-hard alloy drill bit was damaged. No damage to the metal. In the fourth battle, the metal was broken in the middle of cutting. The metal side thinks it has lost. The drill bit side thinks that the damage to the workpiece caused before drilling the hole is also negative. So it's a tie. In the fifth battle,dth hammer bit, the drill bit drew lessons from the previous competition and designed a method to recover the chips. After 1hr20min of cutting, when there is 3mm left before penetration, the machine stops because the drill bit is completely worn. In the sixth battle, the hardness of the metal side evolves again (above HV2100). In response, the drill bit side adopted slow cutting tactics, and after 7 hours of fierce fighting, the drill bit was worn by abrasive particles and failed again. Despite varying degrees of damage, the metal did not fail. Just when everyone was convinced of defeat, the seventh challenger came with his drawings. What is the outcome of the prediction? First watch the video (with Chinese subtitles), then listen to the detailed explanation. You must have seen the simple drill drawing of the seventh challenger in the video. ↓↓ Expand the full text Unfortunately, dhd drill bit ,dth drill bits, the challenger only has an empty drawing. Without the ability to produce such a drill. He said that as long as he could produce the drill he designed. I'm sure I can win. The challenger is Iwata Tool's president, Iwata, the owner of a small company with 40 employees, who is at a loss to design and calculate his own drawings without the ability to produce them. At this time, a miracle appeared. 76 drill bit companies volunteered to join the team to produce this kind of drill bit. They have different high-end cutting technologies. They are willing to give their unique skills to make the strongest drill bit together. President Iwata took out his own design drawings and began to enter the research and development stage with the strongest drill bit team. We analyzed the hardness of the strongest metal in the first six times: It turns out that the strongest metals are not the same. Metal hardness and strength improved with each PK The hardness of the first metal is 1700 HV For the sixth time, the hardness of the metal reached 2119HV. Next, the hardness of the metal should increase against the sky. At this time, the abrasive particles need to be carefully selected. Achieve super resistance and wear resistance Many holes are drilled on the upper side of the drill bit designed by President Iwata, and abrasive particles are buried in the holes, so the difficulty of design and production can be imagined. Start making the drill bit The first thing to be made is the main part of the drill bit. This can be done at IwataTool. Through a unique heat treatment process, An ultra-hard drill bit body is produced The next step is to punch a hole in the side of the drill bit. This requires a professional company to produce. This is technology at the micron level. Then another company inserts abrasive particles into the drilled side hol Next, another company attached abrasive particles to the side of the drill bit. After the drill bit is produced The drill bit is fully inspected by another company of the team. The next step is to test the produced drill bits to deal with various hardness materials, and then to summarize the test, improve the technology and improve the details. Sometimes we will discuss until the early morning. At the end of the drill, a black technology is added: gold plating technology.It is to bond the drill bit and the abrasive particles together to the greatest extent possible. To resist prolonged grinding. The following is the finished super drill bit ↓ ↓ Give a close-up ↓ ↓ This super drill is made to punch through metal with a hardness of 2200 HV. Beyond the hardness of the sixth This hardness is the highest hardness that everyone estimates for superhard metals. And the wear of the super drill bit is very slight. The pressure has completely come to the strongest metal. Nakagauchi, the head of Tungsten's strongest metals, has been in the limelight for the first six times. 31-year-olds think. The hardness of the first six strongest metals is public data. Opponents must be able to build a drill that breaks through the sixth hardness. Will come to challenge. Nakagawa is trying to develop a metal that exceeds the sixth hardness of 2119HV. However, he failed again and again. At this time, the president of Tungsten Company made a surprising move. He wants to change the coach temporarily. The person in charge of the strongest metal was replaced by Matsubara, who was only 29 years old. For honor It's also a fight. Matsubara changes the way the strongest metals are made He sacrificed strength to increase hardness. As a result, the strongest metal he made went against the sky. The hardness has reached 2334HV. Just when Songyuan was developing the strongest metal. President Iwata has not been idle with his strongest drill team. They tried to improve on the way the holes were drilled. Drilling from top to bottom may cause the drilling to stop because the debris cannot be discharged in time. If the drill bit is placed laterally to drill the hole, Debris will be removed in a more timely manner If the rotary table of the drill bit with the strongest metal is kept rotating at this time, At this time, the grinding ability of drilling will be greatly improved. Of course, abrasive particles will also fall off faster. A balance must be found. Finally, after many tests. It was decided to start the turret turning procedure when the drilling depth reached 10 mm Maximize drilling capacity The seventh strongest duel finally began when all sides were ready. The strongest metal really lives up to its reputation. Under the galloping rotation of the strongest drill bit, the cutting fluid turns into an oval shape. However, the strongest metal still defends freely. That's when the miracle happened. The sound of metal rubbing changed. This change was first discovered by President Iwata. At this time, the turntable began to rotate. That is to say The strongest bit has drilled a hole depth of 10 mm The final battle has begun. The strongest metal is just too hard. Rotation of the rotary table increases the risk of breaking the drill bit At this time, the most worrying thing is President Iwata. He even said it. I can't I can't. Result As you can see. The strongest metal has been penetrated. At this time, the strongest drill bit still has a golden body. This wonderful match shows the strength of Japanese small and medium-sized enterprises and the strength of unity,dth rock bit, and the final is at this level. In fact, there is no loser, and both sides have shown their strongest selves. Source: Intuitive Mechanics Editor: Changda Return to Sohu to see more Responsible Editor:. wt-dthtools.com
• August 19, 2022 11:55 AM +05

  in the topic Drill bit specifications are complete in the forum News and Announcements

  Original title: The specifications of the drill bit are complete, and the arrangement is too complete. Drill is a tool used to drill through holes or blind holes in solid materials and to ream existing holes. The commonly used drill bits are twist drill, flat drill, center drill, deep hole drill and trepanning drill. It is customary to classify reamers and counterbores as drill bits, although they cannot make holes in solid material.The specifications of various drill bits are shown in the table below Drill size 180 degrees Specification Small diameter Large diameter Full length Small diameter Blade Long handle diameter M33.46.565136.5 M44.58.075188 M55.59.585229.5 M66.611.0902511 M89.014.01002812 M1011.017.51103012 M1214.020.01153212 1/46.8511.0902511 5/168.5514.01002812 3/810.115.01103012 1/213.520.01153212 Drill size 90 degree Specification Small diameter Large diameter Full length Small diameter Blade Long handle diameter M33.46.465356.4 M44.58.475428.4 M55.510.4855010.4 M66.612.5905312.0 M89.016.51005312.0 Drill size 180 degrees Specification Small diameter Large diameter Full length Small diameter Blade Long handle diameter M33.46.565136.5 M44.58.075188 M55.59.585229.5 M66.611.0902511 M89.014.01002812 M1011.017.51103012 M1214.020.01153212 1/46.8511.0902511 5/168.5514.01002812 3/810.115.01103012 1/213.520.01153212 Drill size 90 degree Specification Small diameter Large diameter Full length Small diameter Blade Long handle diameter M33.46.465356.4 M44.58.475428.4 M55.510.4855010.4 M66.612.5905312.0 M89.016.51005312.0 Bit outer diameter bit length bit outer diameter bit length φ20mm350mmφ102mm350mm/420mm φ22mm350mmφ108mm350mm/420mm φ24mm350mmφ110mm350mm/420mm φ26mm350mm/420mmφ114mm350mm/420mm φ28mm350mm/420mmφ120mm350mm/420mm φ30mm350mm/420mmφ127mm350mm/420mm φ32mm350mm/420mmφ132mm350mm/420mm φ38mm350mm/420mmφ150mm350mm/420mm φ40mm350mm/420mmφ159mm350mm/420mm φ44mm350mm/420mmφ166mm350mm/420mm φ50mm350mm/420mmφ180mm350mm/420mm φ57mm350mm/420mmφ200mm350mm/420mm φ63mm350mm/420mmφ220mm350mm/420mm φ76mm350mm/420mmφ250mm350mm/420mm φ83mm350mm/420mmφ275mm350mm/420mm φ89mm350mm/420mmφ300mm350mm/420mm Drill size 180 degrees Expand the full text Specification Small diameter Large diameter Full length Small diameter Blade Long handle diameterM33.46.565136.5 M44.58.075188 M55.59.585229.5 M66.611.0902511 M89.014.01002812 M1011.017.51103012 M1214.020.01153212 1/46.8511.0902511 5/168.5514.01002812 3/810.115.01103012 1/213.520.01153212 Drill size 90 degree Specification Small diameter Large diameter Full length Small diameter Blade Long handle diameter M33.46.465356.4 M44.58.475428.4 M55.510.4855010.4 M66.612.5905312.0 M89.016.51005312.0 Specification table for center bit Blade diameter (d) Blade diameter tolerance Blade length (L2) Shank diameter (D) Overall length (L) 0.40.05-0.050.53.031 0.50.05-0.050.63.031 0.60.05-0.050.73.536 0.70.05-0.050.83.536 0.80.05-0.050.94.036 0.90.05-0.051.04.036 1.00.05-0.051.24.036 1.24.0100 1.20.05-0.051.45.042 1.50.05-0.051.85.042 1.85.0100 1.85.0150 1.85.0200 2.00.08-0.082.45.042 2.46.0100 2.46.0150 2.46.0200 2.50.08-0.083.06.047 3.08.0100 3.08.0150 3.08.0200 3.00.08-0.083.67.757 3.610.0100 3.610.0150 3.610.0200 3.20.08-0.083.87.757 4.00.08-0.084.810.069 4.810.0100 4.810.0150 4.810.0200 5.00.12-0.126.011.069 6.012.0100 6.012.0150 6.012.0200 6.00.12-0.128.016.090 8.00.12-0.1210.018.0100 10.00.12-0.1212.018.0100 12.00.12-0.1215.022.0110 High-speed steel hollow drill bit, also known as core drill bit or hole opener, drill bit classification: high-speed steel drill bit, hard alloy drill bit, tungsten steel drill bit; cutting depth: 35MM, 50MM, 100M; suitable for drilling machine: imported magnetic seat drill, magnetic drill,overburden drilling systems, domestic magnetic seat drill, magnet drill, magnet drill, steel plate drill, magnetic drill,down the hole bit, machine tool, bench drill, seat drill and so onDiameter specification: 12mm to 100mm; the main material of drill bit is high-speed steel. Powder metallurgy; Cemented carbide. The axis of the drill bit shall be inclined at an angle of 60 ° to the grinding wheel surface. This angle is the point angle of the drill. If the angle is not correct, it will directly affect the size of the point angle of the drill, the shape of the main cutting edge and the bevel of the chisel edge. This refers to the position relationship between the axial line of the drill bit and the surface of the grinding wheel. It is OK to take 60 °, which is generally more accurate. Attention shall be paid to the relative horizontal position and angle position of the drill before sharpening. The two positions shall be considered as a whole. Do not neglect to set the angle for the sake of setting the cutting edge, or neglect to set the cutting edge for the sake of setting the angle. The greater the ratio of the length to the diameter of the drill bit, the greater its tendency to bend. The bending force can be reduced by reducing the length-diameter ratio, thereby avoiding the breakage of the drill bit and the increase of the hole diameter error. Deeper holes require drill sizes with larger length to diameter ratios. Usually, a hole with a depth of more than three times the diameter is a "deep hole", DHD Drill bit ,mining dth bit, and the depth of a micro-drill generally exceeds this limit. Specification of electric hammer bit: 6mm, 8mm X 110mm; 8mmx160mm; 8mm,10mm,12mmx210mm,10mm,12mm,16mm,20mmx450mm。 The main body of the hard alloy electric hammer drill is made of high-quality alloy steel, and the tool bit is welded with hard alloy. Used together with various electric hammers, suitable for drilling on hard building materials such as concrete, brick, etc. It is a widely used and highly efficient punching tool in the construction and installation industry. Specification of electric hammer bit set: 5110mm × 6 Specification of electric hammer bit set: 5110mm, 6110mm, 6160mm, 8160mm, 10160 mm Round shank and square shank of electric hammer bit 6MM 8MM 10MM 12MM 14MM 16MM-28MM is Through-wall drill length 350 MM 16MM 18MM 20MM 22MM 25MM 28MM Drill bit type A. Classification by structure (1) Integral drill bit: the drill top, the drill body and the drill shank are integrally made of the same material. (2) End welding type drill bit, the drill top part is welded by carbide. Ｂ． Classification by drill (1) Straight shank drill bit: the drill bit diameter is less than ψ 13.0. Below mm, straight shanks are used. (2) Taper shank drill bit: the shank of the drill bit is tapered, and generally its taper is Morse taper. Ｃ． Classified by use (1) Center drill bit: It is generally used to drill the center point before drilling. The front conical surface is 60 °, 75 °, 90 °, etc. In order to use the tailstock to support the lathe during operation, the 60 ° center drill bit should be matched with the lathe tailstock center at 60 °. (2) Twist drill bit: It is the most widely used drill bit in industrial manufacturing, and we generally use twist drill bit. (3) Superhard drill bit: The front end of the drill body or all of it is made of superhard alloy tool material, which is used for drilling and processing materials. (4) Oil hole drill bit: The drill body has two small holes through which the cutting agent reaches the cutting edge to take away heat and chips. With this drill bit, the workpiece is generally rotated while the drill bit is stationary. (5) Deep-hole drill bit: It was first used for the drilling of gun barrels and stone barrels, also known as gun barrel drill bit. The deep hole drill is of a straight flute type, and a quarter of a strong portion is cut off in a circular tube to produce chip removal at the cutting edge. (6) Drill bit reamer: In order to meet the needs of mass production, the front end is a drill bit and the rear end is a reamer. The diameter of the drill bit and the diameter of the reamer are only the margin of reaming. There are also drill bits used in combination with screw tapping, so they are also called mixed drill bits. (7) Taper drill: Taper drill can be used when machining the feed inlet of the mold. (8) Cylindrical hole drill: We call it a countersunk end mill. The front end of this kind of drill has a part with a smaller diameter,mining dth bit, which is called the lead. (9) Taper hole drill: It is used for drilling taper holes. Its front end angle is 90 °, 60 °, etc. The chamfering cutter we use is a kind of taper hole drill. 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