Contact Us
Heat Treatment Characteristics Of Custom Molds For Plastic

Heat Treatment Characteristics Of Custom Molds For Plastic

1. For custom molds for plastic with high hardness, high wear resistance and high toughness, carburized steel should be selected for manufacture, and carburizing, quenching and low-temperature tempering should be taken as final heat treatment.


2. For the requirement of the carburizing layer, the thickness of the carburizing layer is 0.8-1.5mm in general, 1.3-1.5mm in mould when pressing plastics with hard fillers, and 0.8-1.2mm in soft custom molds for plastic. The best carbon content of the carburized layer is 0.7%~1.0%. If carbonitriding is used, the wear resistance, corrosion resistance, oxidation resistance, and stickiness resistance will be better.


3. The carburizing temperature is generally 900-920 ℃. The small custom molds for plastic with complex cavity can be carburized at 840-860 C at medium temperature. The holding time of carburizing is 5 to 10 hours, which should be selected according to the requirement of the thickness of the carburizing layer. The optimum carburizing process is graded carburizing, i.e. the high-temperature stage (900-920 ℃) is to rapidly infiltrate the carbon into the surface of the parts; the medium temperature stage (820-840 ℃) is to increase the thickness of the carburizing layer, so that a uniform and reasonable gradient distribution of carbon concentration can be established in the carburizing layer, which is convenient for direct quenching.


4. The quenching process after carburizing is different according to the steel type. After carburizing, the following methods can be adopted: reheating quenching; direct quenching after grading carburizing (such as alloy carburizing steel); direct quenching after medium temperature carbonitriding (such as small precision die formed by cold extrusion of industrial pure iron or low carbon steel); air quenching after carburizing (such as large and medium dies made of high alloy carburizing steel).


Related News
  • Advantages of Chinese Mould Enterprises

    Advantages of Chinese Mould Enterprises

    October 28, 2019China Mould Company has obvious advantages in labor cost and equipment scale. On average, employees of China mould company work more than two hours a day than those of German mould enterprises, and th...view
  • Laser Heat Treatment Improvs the Quality of Automotive Mold Manufacturing

    Laser Heat Treatment Improvs the Quality of Automotive Mold Manufacturing

    May 26, 2020Compared with American OEM manufacturers, the automotive mold makers all over Europe are providing the same auto mold at a faster speed, with higher quality and lower cost. The reason lies in laser he...view
  • Prototype Mold Background Technology

    Prototype Mold Background Technology

    April 21, 2020The mold refers to various molds and tools of the desired product, which are obtained by industrial injection molding, blow molding, extrusion, die casting or forging molding, smelting, stamping and o...view
  • Classification of CNC Plastic Mold

    Classification of CNC Plastic Mold

    October 28, 2019There are many kinds of CNC plastic molds, which can be classified according to forming material, forming process, loading and unloading mode, cavity number, parting surface characteristics, forming p...view
  • The Main Scope of Mold Modeling Services

    The Main Scope of Mold Modeling Services

    April 21, 2020Mold modeling service: It usually refers to the 3D modeling of the product, focusing on the use of software. The 3D modeling of the mold structure is more focused on the test of the 3D design software...view
  • Insert Moulding Process

    Insert Moulding Process

    April 21, 2020Insert moulding refers to the moulding method in which the mould is filled with pre-prepared inserts of different materials, injected with resin, and the molten material is joined with the inserts to ...view
Plastic Injection Moulds
Plastic Parts Gallery