In the processing of automobile stamping die, what influence does the precision requirement of die have on the processing technology?

The precision requirement of automobile stamping die directly affects the selection of processing technology, the configuration of equipment and the quality control measures during processing. The following are the specific impacts:

Influence on the selection of processing technology

Ordinary precision requirements: When the precision requirements of the die are relatively low, such as some stamping dies with simple structures, and the tolerance range is above ±0.1mm, ordinary cutting processes, such as ordinary milling and drilling, can be adopted. These processes have low cost and high efficiency, and can meet the general accuracy requirements. For example, for some simple dies of small stamping parts, the required accuracy can be achieved by using ordinary milling machines to process cavities and mounting holes.

Medium accuracy requirement: If the mold requires high accuracy and the tolerance is between 0.05 mm and 0.1 mm, CNC milling and EDM are usually used. CNC milling can process complex shapes and high-precision surfaces through accurate programming and control systems. EDM is suitable for machining cavities with complex shapes and high precision, which can control the machining size and surface quality well. For example, CNC milling combined with EDM is often used to ensure the accuracy of some key cavities of automobile panel dies.

High-precision requirements: For molds with extremely high precision requirements, the tolerance is within 0.05 mm. In addition to using high-precision CNC machining equipment, it may be necessary to combine precision grinding, WEDM and other processes for finishing. Precision grinding can obtain high dimensional accuracy and surface smoothness, which is used to process the key mating surface and molding surface of the mold. WEDM, on the other hand, can process high-precision straight wall profiles and narrow slits. For example, in some precision stamping dies, in order to ensure the fit clearance between punch and die within ±0.02mm, WEDM is often used to process punch and die, and then precise grinding is carried out to ensure the surface quality and dimensional accuracy.

Influence on processing equipment configuration

Precision testing equipment: with the improvement of mold precision requirements, it is necessary to equip with higher precision testing equipment. For ordinary precision molds, it is possible to use ordinary calipers, micrometers and other measuring tools for testing. However, for high-precision molds, it is necessary to use precision measuring equipment such as three-coordinate measuring instrument and laser interferometer to monitor and control the machining accuracy in real time and find and correct the machining errors in time.

Machine tool accuracy: In order to meet the processing requirements of high-precision molds, it is necessary to use a higher-precision processing machine tool. For example, a high-precision CNC machining center has higher positioning accuracy and repeated positioning accuracy, which can ensure the dimensional accuracy and shape and position tolerance of the mold during machining. At the same time, the stability and rigidity of the machine tool are also very important to reduce the vibration and deformation during machining and ensure the consistency of machining accuracy.

Influence on quality control of machining process

Optimization of process parameters: In high-precision mold processing, it is necessary to control the process parameters more strictly. Taking milling as an example, the selection of parameters such as cutting speed, feed and cutting depth may be relatively loose for ordinary precision molds, but for high-precision molds, it is necessary to optimize them accurately according to factors such as mold materials and tool performance to reduce machining errors and surface roughness.

Tool selection: High-precision die machining requires higher tools, so it is necessary to choose tools with high precision, good rigidity and strong wear resistance. For example, the use of high-precision cemented carbide tools or diamond tools can ensure the dimensional stability and cutting accuracy of the tools during machining, and reduce the impact of tool wear on mold accuracy.

Clamping and positioning: in order to ensure the machining accuracy of the mold, high-precision fixtures and positioning devices are needed in the process of clamping and positioning to ensure the position accuracy of the mold in the machining process. For some complicated molds, it may be necessary to adopt multiple positioning benchmarks and precision fixtures to ensure the relative position accuracy between various machining parts.

Environmental control: high-precision mold processing usually needs to be carried out in a constant temperature and humidity environment to reduce the influence of environmental factors on mold accuracy. Changes in temperature and humidity may lead to thermal expansion and cold contraction of die materials and machine tool parts, thus affecting machining accuracy. Therefore, it is necessary to equip corresponding environmental control equipment, such as air conditioning system and dehumidifier, to control the temperature and humidity of the processing environment within a certain range.