The control of the surface temperature of the die-casting mold is very important for the production of high-quality die-casting parts. Uneven or inappropriate die-casting mold temperature will also lead to dimensional instability of the casting, and deformation of the casting during the production process, resulting in defects such as thermal pressure, mold sticking, surface depression, internal shrinkage cavities, and thermal bubbles. When the mold temperature difference is large, the variables in the production cycle, such as filling time, cooling time and spraying time, have different degrees of influence.
(1) According to the material categories used by the product, the shape and precision of the product, and other indicators, the product is subjected to process analysis, and the process is determined.
(2) Determine the position of the product in the mold cavity, and analyze and design the parting surface, the overflow system and the gating system.
(3) Design the core assembly method and fixing method for each activity.
(4) Design of core pulling distance and force.
(5) Design of ejector mechanism.
(6) Determine the die casting machine, design the mold base and cooling system.
(7) Check the relevant dimensions of the mold and the die-casting machine, and draw the process drawing of the mold and each component.
(8) The design is completed.
With the rapid development of the automobile and motorcycle industry, the die-casting industry has ushered in a new era of development, and at the same time, higher requirements have been placed on the comprehensive mechanical properties and life of die-casting molds. Luo Baihui, secretary general of the International Mould Association, believes that it is still difficult to meet the ever-increasing performance requirements only by the application of new mould materials. Various surface treatment technologies must be applied to the surface treatment of die-casting moulds in order to achieve high efficiency, high precision and long life requirements for die-casting moulds. Among various molds, the working conditions of die-casting molds are relatively harsh. Die casting is to make molten metal fill the mold cavity under high pressure and high speed for die casting, and repeatedly contact with hot metal during the working process. Therefore, the die casting mold is required to have high thermal fatigue resistance, thermal conductivity, wear resistance, and corrosion resistance, impact toughness, red hardness, good mold release, etc. Therefore, the technical requirements for the surface treatment of die-casting molds are relatively high.
In the context of increasingly fierce competition in the international die-casting mold market, the Japanese die-casting mold industry is also working hard to reduce production costs. In terms of market size, the decline in output or demand is the most obvious in Japan. Japanese mold manufacturers attach more importance to polishing and grinding processes in technology, while German mold manufacturers start by improving the accuracy and efficiency of machining and electrical discharge machining to reduce manual processing time. Japan's die-casting mold industry is gradually shifting low-tech molds to production in areas with low labor costs, and only producing high-tech products in the country. Japan's trend of accelerating its transfer to foreign countries has increased the use of die-casting molds in Japan.