Key words: punch die process, geometric position tolerance    At present, China's economy continues to develop at a high speed, and the machinery manufacturing industry has gradually shifted from traditional operational control to digital control. The foundation of digital control technology is also the basic technology of processing technology, so the milling technology is more important. In order to enable students to better understand and master the operation technology of CNC milling machines and machining centers, it is indispensable to carry out the basic techniques and skill operation training of strict ordinary milling machines. Milling of molds is one of the key and difficult points for students to learn processing technology. After many years of teaching practice, the following is an introduction to the milling process and quality analysis of the mold.    Milling of molds is complicated, and complex mold parts are generally formed on a copy milling machine. With the rapid development of the machinery manufacturing industry, most of them are now processed on CNC milling machines or machining centers. Relatively simple small-to-medium molds or single-piece molds are often machined on end mills.    The mold can be divided into two types: punch and die. The following describes the method and steps of milling the punch and die in the end mill: One. Punch milling    Taking Figure A-1 as an example, the milling process of the punch is introduced.    1. Milling hexagonal body Milling hexagonal body with end mill on end milling machine, grinding allowance of 0.3mm on both base surfaces A, B and C, and then smoothing on surface grinder    2. Before milling the contour face milling mold, the reference line and the machining contour line should be drawn according to the technical requirements shown in Figure A, and the eye should be punched. The workpiece is then clamped to a rotary machine vise with a disc base, and the end face is milled with an end mill on an end mill. Figure A-1 Milling of the punch    As shown in Figure A-1, the steps for milling the contour surface are as follows: (1) Adjust the relative position of the end mill and the workpiece, and roughly mill the four steps of the 1, 3, 5 and 6 shown in Figure A-1. Rough milling of 85.9 ~ 86mm, 39.5 ~ 39.7mm, depth of 22mm platform. Then adjust the vise installation position according to the line to find the forward slant line parallel to the longitudinal feed direction of the table, and mill out the 2 and 4 slopes. (4) The upper plane is milled, and a boss of 10.5×5.5 mm (R5 boss position) is left at a distance of 32 mm from the base surface B.    3. Detect the workpiece and measure the size with a vernier caliper according to the requirements of Figure A-1 Next page Din934 Hex Nut,Hex Nuts,M4 Hex Nuts,M6 Hex Nuts Chuangtuo Jinggong (Jiangsu) Co., LTD , https://www.chtofastener.com
,width 
, 59mm high. 
(2) Mount the workpiece with a circular turntable and mill the R10 arc surface to the pattern requirements. To ensure the length of 85.9 ~ 86mm.
(3) Milling the arc surface of two R5s to the pattern requirements.
(5) R5 concave semicircular milling cutter on horizontal milling machine, R5 convex arc surface to the requirements. And to ensure that the center of the R5 to the base B is 32mm, to the stage is 22mm. 
Whether 42mm is within the dimensional tolerance. Whether the parallelism is within 0.05mm. Use R gauge or template to check whether R5 and R10 meet the process requirements.
Milling process and quality analysis of molds in milling teaching (Figure)
Abstract: With the development of China's economy and industrial modernization, the talents who master the processing technology have become the shortage of talents in the society. The numerical control technology developed in recent years has developed more space and more rapid. Vocational education schools aim to train the society with the skills and skills that are in short supply for the society. In the mechanical manufacturing industry, milling is one of the types of cutting operations. Milling machines have a wide range of processing and high precision. The technology of the machining center is also a comprehensive door technology that combines several types of work technology based on milling technology. Therefore, milling technology is one of the main technologies that are indispensable. The mold processing and quality analysis described in this article is a summary of the author's experience in the past few years. There are certain tips and references for mastering mold milling.