Dongguan Da Ling Shan Chang Sheng processing hardware store causes: the holes caused by: The main mechanism of stomatal and contraction of the metal shell HDMI, porosity is often rounded zinc alloy plate, but the majority are irregular contractions. (1) pores causes: a liquid metal zinc alloy medal in the filling and solidification process, due to gas invasion, leading to the casting surface or internally generated holes. b paint out of the volatile gas intrusion. c alloy liquid gas content is too high, the precipitation during solidification. When the cavity in the gas, the coating volatile gases, gases evolved solidification, when the mold exhaust bad, eventually left in the pores formed in the casting. (2) shrinkage causes: a liquid metal zinc alloy solidification process, due to the volume reduction or final solidification of liquid metal parts are not feeding, and produce shrinkage. What Dongguan Da Ling Shan Chang Sheng processing hardware store zinc alloy die-casting and aluminum die casting is the biggest difference? From a single die casting process, I think the biggest difference is as follows: 1, the temperature of molten metal alloy of two different machining, zinc alloy at 400 degrees, aluminum go to over 700 degrees for the job. 2, the processing equipment is different, though called die-casting machine, but not completely generic. 3, process and parameters are different. Zinc alloy handle, Chang Sheng Hardware (certified), zinc alloy provided by Dongguan Da Ling Shan Chang Sheng processing hardware store. Dongguan Da Ling Shan Chang Sheng processing hardware store (shop1379091614724.1688.com) is Dongguan, hardware accessories leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Chang Sheng Hardware in leadership with the staff warmly welcome all inquiries negotiations to create Chang Sheng Hardware a better future.