For example, the machines in the camshaft production line use the current top systems such as Siemens 840D and FANUC18i to realize the automatic control of FMS; through the joint research of Chery's technicians and the developers of machine tools and control systems, new extensions are made on the original platform. And developed a variety of control functions and software. For example, the end face machining unit has a control system of Siemens 840D. In order to match the large-capacity tool storage unit required for multi-variety production and tool life management in high-speed cutting, the ARTIS tool detection software is added to the Siemens CNC system to detect during the cutting process. The change of the torque of the spindle motor is monitored by simulation and comparison to ensure the reliability and stability of the machining. At the same time, the automatic control system of the production line also expands the active detection function, detects the machining dimensions in real time during the cutting process, and feeds the data back to the control system to randomly correct the cutting parameters to ensure the machining accuracy.
The storage technology is directly related to the automation degree and reliability of the FMS, affecting the logistics, opening rate and variety switching cycle of the production line. The shaft production line uses the high-speed gantry robot and the transfer bin with the workpiece identification function to form the storage system of the production line. The manipulator can run at an speed of 120m/min on the X axis, and can also send the loading signal according to each processing unit. In the control system, through the high-speed, high-precision calculation, the loading sequence of the optimized path is determined within 0.01s to ensure the processing cycle of the production line.
The storage system of the camshaft production line also takes into account the characteristics of high-humidity environment and regional foundation, and increases the automatic compensation of temperature and the compensation function of foundation sinking. The system can periodically detect the changes of the external environment and the difference of its own precision. Through the calculation of the modular software in the system, it can self-diagnose and compensate, and reduce the positioning deviation.
The camshaft production line can process a variety of camshafts in a collinear manner. The machining range covers camshafts for three-cylinder/four-cylinder steam/diesel engines with a length range of 300-600mm. It can be said that such a flexible production line is established, which is equivalent to the establishment of 7 The traditional cam axis above the strip, its significance has not only been a flexible manufacturing system, but a centralized factory for camshaft manufacturing.
The main feature of FMS is the ability to achieve multi-variety collinear production, and the switching between varieties can be completed quickly and easily. This line is the most convenient changeover by finding and comparing the common positioning and clamping standards of multiple models.
Figure 3 camshaft production line
Flexible processing case
According to market demand, Chery developed a new cast iron engine in 2006. In order to shorten the production cycle, the company decided to carry out collinear production on the original cast aluminum cylinder line. Through the comparative analysis of the products, we have adjusted and replaced the jaws of the manipulator, the positioning pins and jaws of the clamp, and at the same time, added corresponding tools, modified the machining program and the robot's conveying control program, and extended the workpiece model device. In terms of control, we have expanded the selection of the machining type on the machine operation interface, and added a key switch to select the machining type on the robot system. In the production changeover, the NC program on the switching machine selects the product program of 1.6L, 1.8L or 2.0L, and selects the corresponding cast iron or cast aluminum workpiece on the robot. The control system will automatically control the model identification device to release the corresponding workpiece. The robot automatically calls the loading and unloading program, and automatically adjusts the loading and unloading position, and the machine tool processes according to the program. The consistency of the entire unit is coordinated and controlled by the robot's control system. Since the production line uses three relatively independent flexible manufacturing units, it is possible to change one unit and one unit, that is, when the second and third processing units are still processing the aluminum cylinder, the first processing unit has been cast iron. Production of cylinders.
Chery's 72 series engine is a self-developed engine mounted on the QQ series. In 2005, with the hot sale of QQ, in order to supplement the capacity of the 72 series engine, we extracted part of the 481 cylinder head line of the engine factory. The machining center processes the 72 series products. Due to the large difference between the two products, we adopted the method of replacing the fixture. The fixture of the 372 was installed on the tray of the 481 machining center, and the original CNC machining program of the 372 device was directly copied and put into production.
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