Heat resistance With the advent of high-speed molding machines, the production speed of plastic products has accelerated. Since the molding temperature is generally between 160 and 350 °C, some of them have poor fluidity and fast forming speed, which will cause the surface temperature of the mold part to exceed 400 °C in a very short time. When the working temperature of the mold is high, the hardness and strength of the mold will decrease, resulting in early wear of the mold or plastic deformation and failure. In order to ensure the precision and small deformation of the mold during use, the mold steel should have high heat resistance. In order to reduce the temperature rise, the die steel should have good thermal conductivity and low thermal expansion coefficient.
Most of the working conditions of the mold with sufficient temperature at the working temperature are very harsh, and some often bear a large load, resulting in brittle fracture. The extrusion molding pressure is relatively large, generally 10~35MPa. Therefore, in order to prevent sudden brittle fracture of mold parts during operation, the mold must have high strength and toughness.
Wear resistance With the expansion of the use of plastic products, automotive stamping parts often need to add inorganic materials such as glass fiber to plastics to enhance plasticity. Due to the addition of additives, the fluidity of plastics is greatly reduced, resulting in mold wear. Therefore, the mold is required to have good wear resistance.
Corrosion resistance Adding flame retardants and polyvinyl chloride to abs resin may emit corrosive gas during the molding process, and sometimes the mold is rusted and damaged at the air runner mouth, so the mold steel is required to have good corrosion resistance.
Good Machining Performance With the enlargement of plastic products, the complexity and precision of the shape, the mold steel is required to have good cutting performance and less work hardening during the cutting process. In order to avoid the deformation of the mold and affect the accuracy, it is hoped that the residual stress during fabrication can be controlled to a minimum.
Mirror polishing processability The inner surface of the mold cavity is smooth, and the molding surface needs to be polished into a mirror surface, and the surface roughness is lower than Ra0.4μm to ensure the appearance of the plastic pressed part and facilitate demolding.
Dimensional accuracy Mold inserts have high machining accuracy and high matching accuracy, and the dimensional accuracy of the cavity is generally 3 to 5 grades. The joint surface of the mosaic cavity needs to be tightly closed to prevent the molten material from entering the gap and causing material leakage.
Pattern pattern photo-erosion performance Many plastic products have added patterns on their surface in order to beautify. In the leather industry, large-scale leather pattern embossed plates are used, which requires mold steel to have good pattern photo-erosion.
Therefore, the mold steel should meet the strength, hardness, wear resistance, heat resistance, corrosion resistance and other performance properties; at the same time, it should also have good polishing properties, dimensional stability, easy nitriding and small heat treatment deformation and other process properties; good thermal conductivity And physical properties such as small linear expansion coefficient, etc.
Pintejin Sheet Metal shop offers a cost-effective solution for a wide range of industries with our custom metal stamping and custom sheet metal fabrication capabilities. Our stampnig operations include a variety of sheet-metal forming manufacturing processes, such as punching, blanking, embossing, bending, flanging, and coining. Our professional, experienced and well-trained engineers can execute the complex metal stamping operations with precision and accuracy.
No matter what your metal fabrication needs are, Pintejin can offer the right solution: from single sheet metal part or sub-assembly of stamped metal parts to turnkey solutions for mechanical and electrical assemblies. We have the technology, equipment and the experience to fabricate customised metal products from aluminium sheet metal fabrication, steel, zinc plated steel, stainless steel sheet metal fabrication, brass and copper. Designs that require CNC machining of surfaces or components can be accommodated. We can supply polished, galvanized, zinc coated or powder coated finishes for any sheet metal work or stamped metal components. Coupled with our accurate and reliable metal fabricating equipment, we guarantee precision and repeatability in custom sheet metal work. You’ll be taking advantage of the best sheet metal fabrication china can produce.