The 20L Bucket Mould seems very simple; actually there are many factors to consider.
Plastic bucket mold cooling system design: The design of the cooling system is a relatively complicated work. We need consider the cooling effect and the uniformity, as well as the influence of the cooling system on the overall structure of the mold. The determination of specific position and size of the cooling system; key parts such as moving mold plate, cooling of inserts; cooling of side slides and side cores; design of cooling elements and selection of cooling standard components. Our company began to analyze these series of problems during mold design. The mold uses circulating water to flow in every part of the mold, reducing the cooling time during injection molding, improving the production efficiency of the product and greatly reducing the production cost.
The construction of the plastic pail mold: the pail mold adopts the I-shaped die structure, the cavity and core are 2738HH, the slider, the guide groove and the insert are 2316 or 718H, the guide post, the guide sleeve, the sprue sleeve, the pulling rod and the reset rod are SKD standard parts. The pail mold base adopts a standard base. With great corrosion resistance, toughness, thermal conductivity and hardness of good materials make polishing easier, saving production cycles, extending mold life, reducing maintenance and repair time, reducing the risk of cracking and increasing production effectiveness.
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A. Good thermostability
The mould components are complicated in shapes and it is difficult to processing after quenching. That's why our first choice is the mould with good thermo stability. bucket mould can easily become small after heat treatment as for the expansion coefficient is relatively small, the rate of dimensional change will be reduced due to the temperature difference. If the bucket mould has a stable structure and dimension, then require no longer processing which can guarantee the mould dimensional accuracy and surface roughness requirements.
B. Sufficient surface hardness and wear resistance
Plastic bucket mould hardness is usually within 50-60HRC. The mould surface shall be sufficient in hardness after heat treatment so that the mould can have sufficient rigidity. The mould has to withstand greater compressive stress and friction as for the plastic mold filling and flow in the injection production, it requires the mould must have high shape and dimension stability, so the mould life can be ensured. However, the mould wear resistance depends on the steel chemical composition and heat treatment hardness; therefore to improve the mould hardness is conducive to improve the wear resistance.
C. Good polishing properties
The high quality bucket requires the 18L Bucket Mould cavity surface roughness must be small. For example, the surface roughness of the injection mould cavity should be less Ra0.1~0.25, the optical surface should be Ra<0.1nm, the cavity shall be polished, thereby reducing the surface roughness value. Therefore the bucket mold steel should reach to these requirements: less material impurities, fine homogeneous organization, no fiber directionality, no pitting or defects in polishing.
