Plastic mold processing performance and service life and the use of a great relationship between materials must pay attention to the choice of mold materials, in general, mold materials should have the following properties.

1、 good thermal conductivity

In the plastic molding process, good mold temperature control on the quality of plastic parts a great impact. In general, copper alloys have better thermal conductivity than alloy steels, but have lower elastic modulus, hardness and durability.

2、high corrosion resistance

Many plastic additives, such as flame retardants, etc., and even the chemical action of the melt itself will corrode the mold cavity. When the plastic raw materials mixed with abrasive fillers and reinforcing materials, it is easier to exacerbate the mold damage, therefore, it is best to use corrosion-resistant clay on the surface of the mold plating, chrome or nickel.

3、good polish

Plastic mold on the molding parts of the roughness requirements are high to meet the requirements of good surface gloss of plastic parts, for this, generally to be polished, it requires the mold material to be easy to polish, there can not be mixed with gas quality defects.

4、good dimensional stability

In the plastic molding process, the mold type

The temperature of the cavity can be as high as 300 ℃ or more, the temperature difference is so large, easy to make micro-changes in the cavity structure, resulting in mold size changes, making the size of plastic parts instability, for which the appropriate tempering treatment of tool steel, steel. In order to improve the hardness and wear resistance, the general mold parts must be heat treatment. However, this heat treatment should minimize the size of the mold, can be used to cut the pre-hardened steel, the steel after machining without heat treatment.

5、 high wear resistance

In order to increase the rigidity and mechanical properties of plastic parts, in the plastic formulations widely used glass fiber, inorganic filler to enhance, and they melt plastic injection mold cavity, the mold cavity of the friction is very large, easy to make the cavity by Excessive wear and tear, therefore, the production of plastic mold parts of the material should have a good wear resistance.