The manufacturing of precision mould can not do without those advanced processing equipment. The main process of precision mold manufacturing includes CNC milling, WEDM, EDM, grinding, turning, measurement, automation and so on.
1、 CNC milling
From the traditional ordinary milling machine to three-axis machining center, and then to today's five axis high-speed milling, no matter how complex the processing of three-dimensional surface parts can almost become a reality, the hardness of the material is no longer a limited problem. The main cavity and surface of plastic mold are processed by CNC milling. The rapid development of plastic mold manufacturing industry mainly benefits from the innovation of CNC milling technology.
2、 Slow moving wire cutting process
It is mainly used for processing various kinds of two-dimensional and three-dimensional ruled surface parts such as stamping die, plastic die and powder metallurgy die. Among them, the proportion of processing stamping die is the largest. The processing of punch, punch fixed plate, die and discharge plate and many other precision holes, slow wire cutting is an indispensable key technology. In the manufacturing of injection mold, the common applications are insert hole, thimble hole, inclined top hole, cavity cleaning angle and slider processing. Generally speaking, the processing accuracy requirement is not as high as that of stamping mold.
Slow wire processing is a high precision processing method, high-end machine tools can achieve less than 3 μ The surface roughness can reach ra0.05 μ m。 At present, the automatic threading and cutting of 0.02-0.03 mm electrode wire can be realized, and the practical cutting efficiency can reach about 200 mm 2 / min.
3、 Electrical discharge machining
EDM is suitable for machining precision small cavity, narrow slot, groove, corner and other complex parts. When it is difficult for the tool to reach the complex surface, EDM is superior to milling where deep cutting is needed and where the aspect ratio is particularly high. For the machining of high-tech parts, the re discharge of milling electrode can improve the success rate. Compared with the high cost of cutting tools, the re discharge machining is more suitable. In addition, EDM is used to provide the surface of spark lines where EDM finishing is required.
4、 Grinding machine processing
Grinder is a kind of precision equipment for finishing parts, especially for hardened parts. The grinding machines used in mold processing are mainly plane grinding machine, universal internal and external grinding machine, coordinate grinding machine (PG optical curve grinding machine).
Small flat grinding machine is mainly used to process small-size mold parts, such as precision insert, precision die core, slider and so on. Large water grinder is often used for large size template processing. Now, the surface grinder grinding wheel linear speed and table movement speed has become a common trend, due to the use of linear guide, linear motor, hydrostatic screw and other advanced functional components technology, the movement speed has made great progress, in addition, the grinding wheel dressing technology has been continuously improved.
5、 CNC lathe
CNC lathe is also a common processing equipment in mold workshop. Its processing range is all revolving parts. Due to the high development of numerical control technology, the complex shape of the revolving body can be easily realized by programming, and the machine tool can automatically change the tool, greatly improving the production efficiency. The machining accuracy and manufacturing technology of CNC lathe are becoming more and more perfect, and even there is a trend of turning instead of grinding. It is commonly used to process round inserts, support heads, positioning rings and other parts in molds, and is widely used in pen molds and bottle mouth molds. In fact, the function of advanced CNC lathe is no longer limited to "turning", it has been expanded to turn milling machine tool, a complex, multi process parts, even can be processed all at once.
6、 Measurement
High precision measuring equipment plays an important role from the digital mapping involved in the early stage of mold design, to mold processing process measurement, to mold acceptance measurement and later mold repair measurement
7、 Rapid clamping and positioning system and automation
A mold part often needs to use a variety of processes to be manufactured. In this process, parts need to be clamped and corrected continuously, which takes a lot of time. The machine tool is idle, and the processing capacity of expensive equipment has not been fully utilized. With the increasingly fierce competition in the field of manufacturing industry. Shorter production cycle is the trend. Foreign fixture manufacturers use a set of stable and accurate benchmark system to realize the unified benchmark exchange of milling, turning, measuring, EDM and other processes. It only takes about one minute to quickly complete the electrode clamping and alignment on the machine tool, and the repeated positioning accuracy is within 3 μ The setting time is shortened to the maximum and the actual running time of the machine is greatly improved. Facts have proved that this is an indispensable condition for modern production.