CNC machining technology is the core of mould manufacturing technology

Moulds present a complex structure of surfaces, high requirements for precision, the hardness of the materials used, and an exceptionally short manufacturing cycle.Mould ManufacturingIt is a complex production process with extremely tight cycle times and demanding technical means. Each mould is a completely new project with different structural characteristics. Therefore, formachiningThe level of technical level is quite high. Traditional machining technology and equipment have certain limitations, relatively low level of craftsmanship, lack of precision, and long production cycle, which directly affects the production efficiency and quality of mould manufacturing.numerical control machiningTechnology towards diversified direction, which covers CNC milling, CNC EDM, and CNC EDM wire cutting, CNC turning, plus CNC grinding, and even contains some other CNC machining methods of in-depth investigation, it can provide a wealth of production means for mould manufacturing. One of the most used is CNC milling machine and machining centre, followed by CNC wire cutting, and CNC EDM in the mould CNC machining application is also extremely common. It can be said that CNC machining technology is the core application of mould manufacturing technology.

1, the characteristics of mould CNC processing

Mould manufacturing is a single piece of production, each pair of moulds have certain differences in structural characteristics, and in the manufacturing process, there is almost no possibility to repeat the opening of the mould, so in the number of programming and machine tool control have higher requirements, in the processing of more complex moulds, it is often necessary to use a third-party mechanical software to carry out automated programming, and then by the mould manufacturing process to be revised.

(2) the design and development of the mould, not as a final product, but for the new product project research and development services, so in the development of the number of unfixed, in the development of time is also not fixed, manufacturing randomness is relatively strong, so the mould design and manufacturing personnel should have a strong adaptive capacity, and to have a wealth of practical experience. At the same time, for the complex processing of the mould cavity surface, the process requires the processing of the cavity surface to achieve sufficient accuracy, to minimize the mould clamp repair work, it is best to avoid manual polishing work.

Mould processing, its manufacturing precision requirements are very high, in order to ensure that the precision of formed products can be guaranteed, mould processing errors must be effectively controlled, otherwise, the error on the mould will be amplified in the product, the mould tolerance range of 1/5 to 1/10 of the formed products, and in the matching at the precision requirements are higher, only to achieve sufficient accuracy to ensure that there will be no overflow.

In the mould manufacturing contains special machining, usually speaking, the internal structure of the mould is more complex, for the sharp corners, ribs and other parts, there is no way to machine it to the appropriate degree, in addition, some products with special requirements, need to carry out EDM, and EDM is to use electrodes, electrode machining needs to be set when the discharge gap. Mould electrodes are often used pure copper or graphite, graphite has easy to process, electrical processing speed and cheap characteristics, however, during the CNC machining, graphite dust for the machine tool is extremely damaging to have a special dust-absorbing device, or immersed in liquid for processing, and to use special CNC graphite machining centre.

2, CNC machining technology in the mould manufacturing applications

By the study of mould CNC machining can know, mould manufacturing, on the machining technology is a relatively high demand, CNC machining belongs to the modern mechanical processing methods, it can meet the special requirements of mould manufacturing, especially digital control technology and precision accuracy has been improved CNC machine tools. In the case of mould CNC manufacturing, the application of CNC machining can play a role in improving machining accuracy, shorten the manufacturing cycle, reduce manufacturing costs, also because of the large number of CNC machining, can reduce the mould clamping experience of the kind of excessive dependence. Therefore, the use of CNC machining in moulds has brought about changes of a transformative nature to mould manufacturing. Today, those in a leading position in the mould manufacturing company, are relying on CNC machining as the main way to build moulds, and around the key point of CNC technology processing to plan the process of mould manufacturing.

2.1 CNC turning

Generally speaking, CNC turning processing in the mould manufacturing for shaft standard parts, such as all kinds of rod parts, including the top, guide pillar, etc., at the same time, can also be used for the manufacture of rotary moulds, such as bottles, pots of injection moulds, shafts, discs, parts of the forging die, stamping mould punches and so on. CNC lathe in view of the limitations of the processing plane, often can only be used for some parts of the mould processing manufacturing.

2.2 CNC Milling

Most of the external structure of the mould is a flat structure, and more concave and convex profile and surface processing, so the application of CNC milling machine is more CNC milling machine can be used to process the profile is more complex or with a curved surface of the mould, such as EDM processing with electrodes, injection moulds, die-casting moulds, etc., can also be used in CNC milling processing. Due to the continuous development of CNC machining technology, nowadays large-scale digital milling machining centre is more commonly used in mould manufacturing.

2.3 CNC EDM

CNC EDM is often used for rapid prototyping, which has high machining accuracy and relatively low programming difficulty. CNC EDM has obvious advantages in the machining of micro-complex shapes, special material moulds, plastic insert cavities and inserts, and moulds with shaped slots. WEDM is mainly used in various straight-walled mould processing fields, such as concave-convex moulds in stamping moulds, inserts and sliders in injection moulds, and electrodes for EDM processing.

3 Conclusion

Nowadays, CNC machining technology has been widely used in various production areas of mould manufacturing, especially in home appliances, light industry, automotive, medical equipment, handicrafts, children's toys and other industries have a fuller application, and the current advanced CNC machining technology in foreign countries has begun to be used in wind power, hydropower, nuclear power, railway transportation and aerospace and other fields to manufacture moulds. In short, the mould has a complex structure, complex surface, high precision requirements, the use of high material hardness, short manufacturing cycle and other characteristics. The application of CNC machining mould can greatly improve the processing accuracy, reduce manual operation, improve processing efficiency, shorten the mould manufacturing cycle. At the same time, the CNC machining of moulds has a certain degree of typicality, compared with the CNC machining of ordinary products, has higher requirements.