Shenyang Machine Tool provides high quality machine tools for 3C product processing
Guosheng Tao, Zhongjie Drilling and Boring Machine Factory, Shenyang Machine Tool Co., Ltd.
As China's demand for 3C products continues to expand, the requirements for equipment used to produce 3C products are also increasing. Whether it is the processing of 3C product parts or the mold processing of 3C products, it has put forward higher requirements for its processing equipment. The following is a description of a machine tool TC500 vertical machining center (see photo) of the Zhongji Lijia Division of Shenyang Machine Tool Co., Ltd., and briefly describes the current 3C product requirements for equipment performance.
TC500 vertical machining center
This machine is used in Foxconn (hereinafter referred to as Foxconn) in Singapore to process the back of the iPhone. At the beginning, when I received the order specification of Foxconn's machine tool, I was worried that our high-speed and high-precision performance indicators could not meet the requirements, because Foxconn received a profit from the processing orders of the 4S rear case processed by Apple's mobile phone company. Low, about a few cents per piece of profit, and the processing technology Apple has basically determined (including the tools used, process steps and tolerances of various dimensions, etc.). In this way, if Foxconn wants to make more profit, it must increase the processing speed. Each processing center processes more than 500 pieces per day, and at the same time, it must control the reject rate below one ten thousandth.
As the person in charge of the project, I understand the importance of the design level. For this performance requirement, the positioning accuracy of the machine tool is set to 0.01mm, and the repeating positioning accuracy is 0.006mm.
The CNC system adopts the Fi yang control system independently developed by Shenyang Machine Tool, because the minimum pulse equivalent of the system can reach the machine tool requirement of 0.001mm; the compensation function is comprehensive, such as backlash compensation, screw pitch error compensation, arc reverse spike compensation Static friction compensation, sliding friction compensation, tool length, tool radius compensation, etc.
In terms of CNC programming, a large number of fixed cycles of drilling, boring and milling processes have automatic corner multiplying/deceleration functions; in order to increase the machining speed, the maximum spindle speed is increased from the original 12 000 r/min to 20 000 r/min, and the rated power is 7.5. kW, rated torque 47.8N·m; X, Y, Z three linear coordinate guides are imported linear rolling guides, strong rigidity, flexible and light, no crawling; digital AC servo motor-ball wire for all moving parts Bar drag, X, Y, Z can get high-speed movement of 20m / min; X, Y, Z feed coordinates use AC servo motor to drive ball screw stepless drive, AC servo feed motor as power source, ball wire The bar is used as the transmission component. The ball screw is fixedly supported at one end, floating support at one end, and equipped with a grating ruler to ensure the precision of the screw feed. The machine tool is equipped with quantitative concentrated grease lubrication, which can regularly lubricate each ball screw nut. The action is automatically controlled by the numerical control system and can be detected and alarmed; the detecting elements of the three coordinates of the machine tool X, Y and Z are equipped with a grating ruler, which can achieve high positioning accuracy; The bed is fully enclosed and has sliding doors on the front and side for easy and safe operation. The X, Y and Z axes are protected to prevent the erosion of iron scraps on the guide rails, protect the guide rails and the lead screws, and improve the service life.
After nearly three months of repeated processing tests, our company's special research team finally delivered 10 machining centers that meet the requirements of Foxconn. After the follow-up investigation, Foxconn applied our processing center to complete the order of Apple as scheduled.
In addition to setting appropriate design parameters, the quality of machine tools is also affected by the advantages and disadvantages of bed materials, machining level, component quality, assembly quality and production control. The quality of machine tool assembly is always guaranteed by manual. The level of assembly mechanics also determines the final accuracy of the entire machine.
Unfortunately, the main components of this high-performance machining center rely on imports, and domestically produced parts can not meet the performance of this machining center. I hope that after a period of hard work, we can make all the important functional parts localized.
At present, advanced technology such as bed thermostat technology, linear motor drive technology, ball screw center cooling technology, center of gravity drive technology, ultra-fast tool change and high-speed electric spindle are used in the company. I hope that the company's products can become a product that can be recognized by users without advertising, and strive to provide valuable products for users' needs. To be able to convince users, the services they receive from the company are better than the services they get from anywhere else.
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