Common problems and maintenance methods of die casting die

Die casting mold is widely used in furniture accessories, architectural decoration, electronic and digital accessories, bathroom accessories, lighting accessories, luggage accessories, all kinds of metal buckle and other industries. Different surface treatment processes require different surface quality of castings and good surface treatment performance. The common defect of die casting mold is surface bubbling. 

 Surface foam characteristics: surface foam of die casting billet, polishing or foam processing after die casting, oil injection or electroplating after die casting surface treatment. Cause: 

 Small bubbles appeared on the surface layer of aluminum billet, and the abrasive tool was thrown out early; 2. High temperature when abrasive tool is thrown out; 3. The design of abrasive flow channel is not scientific and the water flow is not smooth. Due to the existence of a large number of bubbles in the process of die casting, when the metal solidification time is not enough, the strength is not certain enough, but the die casting mold is too early to open the top of the casting, compressed air bubble expansion makes the surface of the casting bulge, resulting in thermal cracks. Common solutions: adjust the die casting process parameters, extend the mold retention time, reduce the mold temperature in the defect area, and improve the design of the feed channel. 

2: After polishing or machining the die casting mold, the quality of the die casting must be checked before mechanical polishing. Inappropriate mold design and casting process can produce defects in the surface layer, such as clearance, subcutaneous blister, porosity, crack, etc., are factors that affect the corrosion potential of the source and quality of electroplating, one of the required quality of die casting, cleaning, the surface of the grinding process after wrong, dense, smooth, no cold tendons, pore-free zinc alloy polishing, mainly to take hemp wheel, Use the cloth wheel again (if the water outlet is not large or do not want to let the object too much loss, you can directly use the cloth wheel to throw). 

3: foam after surface treatment of die casting mold, a. Pretreatment process and processing process, here take the common electroplating process for example, common process flow is as follows: pretreatment → Cleaning & rarr; Basic copper plating → Cleaning & rarr; Pyrophosphate copper plating → Cleaning & rarr; Acid copper plating → Cleaning & rarr; Semi-gloss nickel → Full gloss nickel → Cleaning & rarr; Chromium plating & rarr; Drying. Different surface treatment and processing methods are different, should refer to die casting surface treatment process standard operating procedure. In addition, poor polishing is also an important reason for bubbling after surface treatment. 

the die casting mould for outside of the aluminum alloy casting aluminum die casting, die casting mould with surface foaming condition, its features and roughly similar aluminum die-casting zinc alloy die casting, die casting surface bubbles must look for the sake of accurate and various improvements, integration, knowledge and understanding of the basis of die castings is more practical and solve the die-casting mould various shortcomings, improve product quality.