Many people are not very familiar with the selection criteria of bmc mold raw materials. Today I will explain it for everyone.

1. Molded parts refer to the parts made by the overall mold of the prefabricated components that directly contact the plastic to produce the product, such as the concave mold, the core, the guide rail slider, the insert, the slope, the side pull, and so on.

2. The material of the formed part is immediately related to the quality and service life of the bmc mold, which determines the appearance and internal quality of the formed plastic product. Bixu is based on the contract terms and customer regulations, and carefully selects them according to the specifications and characteristics of the products and bmc molds.

3. The selection criteria of forming raw materials are: according to the type of forming plastic, the appearance of the product and the precision of specifications, the appearance quality of the product and the application regulations, the size of the manufacturing batch number, etc. Taking into account the various characteristics of raw materials, such as laser cutting, grinding and polishing, electric welding, etching, deformation, wear resistance, etc. Fully consider the rationality of bmc molds, manufacturing standards and production and processing methods, and select different types of stainless steel plates.

4.For bmc molds used to form fully transparent plastic products, the die and core should be made of imported gaoji stainless steel plates with high polishing characteristics, such as 718 (P20Ni), NAK80 (P21), S136 (420), H13 steel, etc. Among them, 718 and NAK80 are in the condition of pre-hardened bottoming, and no heat treatment process is required; after quenching, the strength of S136 and H13 steel is generally HB160-200. After the initial processing, it must be heat treated and quenched with a vacuum pump. S136 steel is generally HRC40-50, and H13 steel is generally HRC45-55 (it can be specified according to the actual model).

5.For bmc molds with high quality requirements, long service life, and mass production, the raw materials of the formed parts are as follows:

Hard condition, no heat treatment process.

a) Imported P20 or P20 nickel steel, such as 618, 738, 2738, 638, 318, etc. It can be used as a transformer core. All of them are in the pre-hardened bottoming situation; for small and large-scale production of bmc molds, domestic plastic bmc mold steels or imported Youzhi carbon steels such as S50C and S55C can also be used.

6.For the bmc molds with general appearance quality regulations, the raw materials of the formed parts are selected as follows:

a) The cavities and cores of small and medium-sized jingmibmc molds should be made of primary imported P20 or P20 nickel steel.

b) Large, medium and small bmc molds, forming plastics have no special requirements for stainless steel plates. The concave mold can be imported low and medium grade P20 or P20Ni steel; low-end imported P20 steel or imported Youzhi carbon steel S50C, S55C, etc. It can also be used as core board or domestic plastic bmc die steel.

c) For decayed teeth with etching processing lines, try to reduce the selection of P20Ni2738 (738) well-known brands when applying pear-shaped grounding wires in etching processing

7.For internal parts without external quality regulations and bmc molds without special requirements for stainless steel plates, the raw materials of the formed parts are as follows:

a) For large, medium and small bmc molds, the concave mold can be made of low-grade imported P20 or P20Ni steel, imported Youzhi carbon steel S55C and S50C, or domestic P20 or P20Ni plastic bmc mold steel; the transformer core can be imported or domestic Youzhi carbon Made of steel. 

b) For small and medium-sized bmc molds, if the production volume is high and the structure is cumbersome, the concave mold can be made of low-grade imported P20 or P20Ni steel or domestic P20 or P20Ni plastic bmc mold steel; the core can be made of domestic plastic bmc mold steel. c) For small and medium-sized BMC molds with simple structure and low production volume, domestic plastic BMC mold steel or Youzhi carbon steel can be used as the concave mold core.

8.Corrosive plastics used to produce fluorine and chlorine. For various plastics with halogen-free flame retardants, imported anti-corrosion steel can be adopted for high commodity regulations, and domestic anti-corrosion steel can be adopted for general regulations.

9.Plastic forming bmc molds have strong friction and impact effects on stainless steel plates. For example, bmc molds injected with polyester fiberglass raw materials should be imported or domestic H13 steel, which has super wear resistance, high sintering compressive strength and high wear resistance. The advantages.

10.Rubber and plastic products software is generally made of the same raw materials as the software. For the parts that cannot be refrigerated or must have high actual effect of refrigeration in the bmc mold, beryllium bronze or aluminum alloy profiles should be used as the raw materials for the inserts.

11.The selection criteria for the raw materials of the theme activity components that participate in the forming in the 11bmc mold are as follows:

a) All transparent parts should be made of gaoji imported stainless steel plates with excellent polishing characteristics, such as 718 and NAK80.

b) Carry out high-frequency quenching to solve the problem, the depth of the high-frequency quenching layer is 0.15-0.2mm, and the strength is HV700-900.

c) If the BMC mold regulations are low, low-grade imported steel or domestic steel can also be used. The strength of high-frequency quenching is generally HV600-800.