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The most important ten items for mold design learning: mold steel, structural design, mold processing, standard parts, flying mold, polishing / leather, mold assembly, cooling water path, and mold maintenance. 1. Die steel Steel is the decisive factor of mold quality, and selecting reasonable steel is the most important. The criteria for selecting steel are: ① Requirements for injection molding materials - different plastics should use different steels, such as requirements for high polishing and corrosion resistance; ② Price - steel properties are good as long as they can be used, not the more expensive the better; Considering the cost…

◆ common sense of sand blasting and rust removal Sand blasting and rust removal is to use compressed air as power to form a high-speed jet beam to spray materials (copper ore sand, quartz sand, carborundum, iron sand and Hainan sand) onto the surface of the workpiece to be treated at high speed, so that the appearance or shape of the outer surface of the workpiece surface changes. Due to the impact and cutting effect of the abrasive on the workpiece surface, the surface of the workpiece can obtain a certain degree of cleanliness and different roughness, The mechanical properties…

Metal: a material with good thermal conductivity and conductivity, which is opaque and metallic luster, and whose conductivity decreases with the increase of temperature, and is rich in ductility and expansibility. A solid (i.e., a crystal) in which atoms in a metal are arranged regularly. Alloy: a substance with metallic properties composed of two or more metals or the fusion of metals and nonmetals. Phase: refers to the independent and uniform components in the metal or alloy with the same chemical composition, the same lattice structure, or the same atomic aggregation state, and a clear interface with other parts. Organization:…

1、 Comparison of temperature resistance between PPR water pipe and PE water pipe Under normal use, the maximum stable temperature of PE water pipeline is 70 ℃, and the minimum temperature is - 30 ℃. In other words, in such a temperature range, long-term use of PE water pipes is safe and reliable. Under normal use, the maximum stable temperature of PPR water pipeline is 70 ℃, and the minimum temperature is - 10 ℃. It also shows that the long-term use of PPR water pipeline is safe and reliable within such temperature range. It is concluded that PE water…

In recent years, with the support of national policies, housing industrialization has developed rapidly. A batch of industrial houses have sprung up, and housing industrialization has entered the fast lane of development. In particular, the development of information technology has promoted the development of housing industrialization towards automation, integration and intelligence. The appearance of 3D printed concrete buildings fully shows the bright prospect of future residential industrial development. The realization of Intelligent Manufacturing in the construction industry is not a castle in the air. Not long ago, a construction company in Shanghai built two buildings with 3D printers. One is…

For coating construction, the film thickness is the most important control factor in the coating process, and its significance lies in:  (1) Prevent coating defects caused by improper film thickness. According to experience, more than half of the appearance defects of the coating in the field production are caused by improper control of the coating film thickness. Some common coating defects such as sagging, thin paint layer and exposed bottom color are directly related to the out of control of film thickness, and some defects are also indirectly related to this. For example, if the film thickness of the first…

What is a cylindrical milling cutter? A milling cutter is a rotary cutter with one or more cutter teeth for milling. We commonly use 45 degree chamfering milling cutter for machining plane on horizontal milling machine. The cylindrical milling cutter has the cutter teeth distributed on the circumference of the milling cutter. Cylindrical milling cutters are divided into straight teeth and spiral teeth according to the tooth shape, and coarse teeth and fine teeth according to the number of teeth. The spiral tooth coarse tooth milling cutter has few teeth, high tooth strength and large chip space, which is suitable…

What are the reasons for the throwing and picking failure of the patch machine? How to solve it? First of all, it is necessary to make clear whether the feeding of the patch machine is uneven and unable to get the material, or whether the suction nozzle is of the wrong size. Is it because the suction nozzle is deformed or the position is wrong? What do you think of the throwing material of the mounter? It is suggested that in case of material throwing or picking failure, stop the operation of the mounter first, and then check and eliminate…

As we all know, when using a mechanical device, we must first understand what it is, what it is used for, and how to install it. Next, this article will focus on introducing the installation method of the framework oil seal and the matters needing attention in the process of using it? Children's shoes who want to understand quickly follow me to have a look! 1. Installation method of framework oil seal in shell hole When assembling the skeleton oil seal, check whether the inner wall is free of debris, scratches, dust and casting sand. Use special tools to smoothly…

Tool holder is the simplest automatic tool changing device of lathe, and it is also a very important component. The structural form of the tool rest is generally rotary. The tool is installed on the tool rest along the circumferential direction, and radial turning tools, axial turning tools, drill bits and boring tools can be installed. The turning center can also be equipped with axial milling cutter and radial milling cutter. The tool rest of a few CNC lathes is in-line, and the tools are installed along a straight line. Next, the quick screen editor will introduce the use method…