1. Preventive measures in the design of valve chip die casting mold
During the design stage of valve chip die casting mold, full consideration should be given to preventing processing defects. First, the parting surface of valve chip die casting mold should be reasonably designed to ensure that its selection can enable the parts to be demolded smoothly without causing problems such as strain. For valve pieces with complex shapes, detailed demolding analysis should be carried out. Secondly, a uniform cooling system should be designed to avoid cracks or deformation caused by thermal stress concentration of valve chip die casting mold due to uneven cooling. The diameter, spacing and layout of the cooling pipe should be accurately calculated based on the size of the valve piece and the die casting process parameters so that the various parts of the valve chip die casting mold can dissipate heat evenly during the die casting process. Furthermore, the design of the gate and runner should ensure the smooth flow of the molten metal to avoid turbulence, air entrainment and other phenomena. The gate position and runner shape can be optimized through simulation software to reduce defects such as pores and shrinkage caused by flow problems.
2. Control of the processing process
The precise execution of the processing technology is crucial to preventing defects. In mechanical processing, the processing accuracy should be strictly controlled, such as milling, EDM and other processes, to ensure that the dimensional tolerance and surface roughness of the Valve chip die casting mold cavity meet the design requirements. For key dimensions, multiple measurements and compensation processing methods can be used. In EDM, the electrode material and discharge parameters should be reasonably selected to prevent the surface of the Valve chip die casting mold from being burned or micro-cracked due to excessive discharge energy. At the same time, the processing sequence also needs to be optimized, such as rough processing before fine processing, and rough processing leaves a suitable margin for fine processing to avoid stress deformation during fine processing due to uneven margins.
3. Material quality and processing
Material quality is the basis of Valve chip die casting mold quality. To select high-quality Valve chip die casting mold steel materials, its purity, hardness, toughness and other indicators must meet the requirements of valve die casting. When purchasing materials, the quality certificates of the materials should be strictly inspected and necessary physical and chemical tests should be carried out. The pretreatment of materials before processing should not be ignored, such as forging to improve the internal structure of the materials and eliminate defects such as looseness. Heat treatment after forging should be carried out strictly in accordance with process specifications to ensure that the material obtains appropriate hardness and strength, laying the foundation for stable performance in subsequent processing and die-casting.
4. Adjustment and maintenance during die-casting
During the die-casting process of the valve chip, the status of the Valve chip die casting mold should be monitored in real time. Regularly check the wear of the Valve chip die casting mold, especially the vulnerable parts, such as the core and cavity surface. When slight wear is found, repair or adjust it in time, such as repair welding, grinding and other methods. Die-casting parameters should also be adjusted according to actual conditions, such as die-casting pressure, temperature, speed, etc., to avoid excessive impact or sticking of the Valve chip die casting mold due to unreasonable parameters, to ensure the smooth progress of the die-casting process, and to reduce the occurrence of processing defects of the Valve chip die casting mold.
