Precision aluminum die casting mold professional customization

2.2 Die casting mold and pouring system planning The mold adopts a six-sided core pulling structure, which is mainly composed of the fixed mold part, the moving mold part, the forming part, the pouring system, the core pulling organization, the ejecting organization, the exhaust system, the heating and insulation equipment, and the positioning and guiding system. Die casting die material is 3Cr2W8V and H13 steel, the core rod can be selected titanium alloy or superalloy, after heat treatment of its hardness (HRC) to more than 45, after surface nitriding treatment, die casting die life can reach more than 100,000 times.

First, optimize the alloying ingredients, supplemented by the essence treatment, to achieve the intention of purifying the alloy liquid; Secondly, the pouring and overflow system is rationally arranged, the low temperature and dirty alloy liquid filled in the front end is introduced into the slag collection bag, and the tooth-shaped chill exhaust block is selected to exhaust, and the slag collection effect is excellent. Shrinkage is characterized by tissue shrinkage, discontinuity, and can be holes and loose areas. The reason is that when the alloy liquid fills the cavity, the pressure cannot be transferred in time to ensure the alloy liquid to cool and condense under pressure, and there is a phenomenon that the liquid metal shrinkage is greater than the solid shrinkage in some thick-walled areas. The method of eliminating shrinkage and loosening, first of all, in the process planning must follow the sequence filling, sequence condensation, timely pressure building criteria, to ensure that all parts of the casting under the pressure pressure to get the alloy liquid timely and effectively make up; Secondly, the selection of reducing the mold temperature of part of the forming part, partial pressurization, high-pressure water cooling and other methods can effectively improve the forming quality of the surrounding.

Features: The spots on the surface of the casting that are different from the base metal are generally composed of paint carbides. Causes: 1, the paint is not pure or excessive amount. 2, the painting contains too much graphite. Elimination method: 1, the paint should be thin and uniform, can not accumulate, to be blown with compressed air. 2, reduce the graphite content of the painting or choose non-graphite water based paint. Pockmarked features: The fine pockmarked distribution area formed on the surface of the casting under conditions similar to underpressure because the mold temperature or alloy liquid temperature is too low during the filling process.

Precision aluminum die casting mold professional customization Welcome to call,2.4.3 casting system finishing selection of automatic hydraulic trimming machine and trimming die, cutting the pouring system, overflow system and cylinder hole flash. 2.5 Residual stress of heat treatment cylinder block casting includes thermal stress, phase change stress and shrinkage stress. The residual stress reduces the mechanical properties of castings and affects the machining accuracy of castings. After 24h natural aging T5 treatment, the intention of eliminating residual stress can be reached. Is T5 processing curve. T5 treatment will cause the hardness of the casting (HB) to decrease by 8~10, after improving the content of Cu, Si, Mn and properly reducing the temperature of T5 treatment, the casting hardness can be obtained. In the meantime, the increase of Cu content and the increase of hardness are significant, but the data cost is high, and the orthogonal experiment of chemical composition and temperature is required to confirm the process plan.