The performance requirements put forward the following requirements: 1. Hardening and other treatments are sufficient, while molds for thermosetting plastic molding must be hardened. Good quenching performance and small deformation:

Generally, the mold for thermoplastic plastic molding is quenched and tempered. First of all, the impurities in the steel The amount of materials should be as small as possible, and there should be no bubbles, and the microstructure should be uniform. The steel must have the performance of easy cutting. 4. Good wear resistance and toughness: Plastic molds have long-term thermal alternating load, and long-term friction.

Mold manufacturers are specifically The performance requirements put forward the following requirements: 1. Hardening and other treatments are sufficient, while molds for thermosetting plastic molding must be hardened. Good quenching performance and small deformation: most of the cavity part of the plastic mold must be heat treated, which requires the steel to have good hardenability and small deformation. When choosing steel, If other conditions can be met, this condition is the basis for the final selection. Excellent polishing performance: No matter what kind of plastic mold, the allowable surface roughness of the cavity is very small, almost all require mirror gloss. Good surface corrosion processability: Many molds require the surface of the molded plastic parts to be patterned with various other materials, such as leather,

When the mold is made of high-carbon and high-alloy steel, insufficient toughness will inevitably lead to cracking.The manufacturing cost of plastic molds is high, and the material cost only accounts for a small part of the mold cost. Therefore, when selecting steel, steel grades with good process performance, stable performance and long service life should be selected first. Excellent machining performance: The geometry of the cavity of the plastic mold is very complicated, and it is required to process deep holes, deep grooves and other difficult-to-machine parts. To achieve mirror gloss, the steel must have good hardness. 5. This requires the texture of the steel to be fine and uniform, otherwise it will corrode The result is not good. The surface roughness of the mold used in mass production is also an important condition

Megosztás a facebookon