Fine metal stamping is now talking about the fine processing refers to the micro parts processing technology. The definition of micro parts usually refers to the size less than 100 m in at least one direction, which has an unparalleled application prospect compared with the conventional manufacturing technology. Micro-robot, micro-aircraft, micro-satellite, satellite gyro, micro-chestnut, micro-instrument and meter, micro-sensor, integrated...

 

Fine metal stamping processing

 

Fine metal stamping processing

Now the micro - machining refers to the micro - parts processing technology. The definition of micro parts usually refers to the size less than 100 m in at least one direction, which has an unparalleled application prospect compared with the conventional manufacturing technology. Made with the technology of micro robot, the micro plane, miniature satellites, satellite gyroscope, micro chestnut, miniature instruments and meters, miniature sensors, integrated circuit and so on, in many areas of modern science and technology have good application, he can bring new development and breakthrough, to many areas will no doubt on the future of our country and had a profound influence on national defense science and technology, the world is incalculable role in promoting the development of science and technology. For example, the micro-robot can complete the optical fiber lead, bonding, docking and other complex operations and the detection of small pipes, circuits, but also integrated chip production, assembly and so on, this is not difficult to glimpse the attractive charm of micro-processing.

Developed industrial countries attach great importance to the research and development of micro-processing and have invested a large amount of manpower, material resources and financial resources. Some forward-looking and famous universities and companies have also joined the ranks of this group. China has also done a lot of research in this field. It is reasonable to believe that in the 21st century, micro-processing will surely bring great changes and profound influence to the whole world just like microelectronics technology. For the die industry, due to the miniaturization of stamping parts and the continuous improvement of precision requirements, the die technology has put forward higher requirements. The reason is that microparts are much more difficult to form than traditional parts is because:

(1) The smaller the parts, the surface area and volume ratio increases rapidly;

(2) The adhesion between the workpiece and the tool, surface tension and other significantly increased;

The influence of grain size is significant, and it is no longer isotropic uniform continuum;

It is relatively difficult to store lubricant on the surface of workpiece.

An important aspect of micro stamping is punching holes, such as micro machines, micro instruments and meters have a lot of holes to press. Therefore, the study of small hole stamping should be a very important problem in micro - stamping. The research of punching hole focuses on: first, how to reduce the punch size; The second is how to increase the strength and stiffness of the micro-punch (in addition to the materials and processing techniques involved, the most commonly used method is to increase the guidance and protection of the micro-punch). Although there are still many problems to be studied in punching holes, many gratifying achievements have been made. Some data show that the foreign developed micro-stamping machine is 111mm long, 62mm wide and 170mm high, equipped with an AC servo motor, which can produce 3KN pressure. The pressure machine is equipped with continuous stamping die, which can achieve blanking and bending. A stomach WFDG technology was used to produce the punch and die for microstamping in The University of Tokyo, Japan. By using this die for microstamping, non-circular microholes with a width of 40 m were punched out of 50 m polyamide plastic sheet.

Tsinghua University has made a good start in drawing ultra-thin-walled metal cylindrical parts. The key of ultra-thin wall drawing technology is to have a high-precision forming machine. They developed a precise forming testing machine with microcomputer control function in the forming of ultra-thin-walled metal cylinder with a wall thickness of 0.001mm~0.1mm, so that the alignment precision of punch and die can reach 1m during the processing, thus effectively solving the problem that the ultra-thin-walled metal cylinder is prone to wrinkle and fracture and cannot be operated normally. Brass and pure aluminum with initial wall thickness of 03mm are processed by this machine in a series of thinning and deep drawing. A series of ultra-thin-wall metal cylinders with inner diameter of 16mm, wall thickness of 0.015mm~0.08mm and length of 30mm are produced. The test results show that the thickness difference of the superthin-walled cylinder is less than 2 m and the surface roughness is 30.057 m, which greatly improves the precision of the instrument and the performance of the whole machine.