The machine tool industry provides the "working machine" to the machinery industry, which is the basis of the machinery industry. The mainstream product of the modern machine tool industry is CNC machine tools. It brings together the most advanced technologies of various disciplines, featuring high efficiency, high precision, high automation and high flexibility. It is developing in the direction of intelligence and integration. It is a contemporary machine. The foundation and core of manufacturing.
Pneumatic technology, full name pneumatic transmission and control technology, is one of the most effective means of automation and mechanization of production process. It has the advantages of high speed, high efficiency, long life, low cost, easy maintenance and anti-overload. In many fields of industrial sector, it is positive. Get more and more widely used applications.
In CNC machine tools, pneumatic technology is mainly used in the following devices due to its easy realization of high frequency commutation, wide range speed regulation, space saving, and simplified machine structure:
1. The movement of machine parts is mainly used for feed motion transmission, such as the movement of the spindle and table.
2. Among the auxiliary devices in CNC machine tools, such as fixed cycle, automatic tool change, clamping release of worktable, opening and closing of automatic door, blowing, workpiece clamping, automatic loading and unloading of workpieces, transfer stacking, etc. At the same time, it can shorten the processing auxiliary time, reduce the labor intensity of workers, and give full play to the high-efficiency performance of numerical control equipment.
3, automatic blowing, such as workpieces, exchange workbench, tool positioning surface, etc.
4. Balance of moving parts, such as the gravity balance of the headstock, the balancing device of the robot and the tool magazine.
5. Detection functions, such as confirmation of workpiece position and confirmation of tool defects.
Because the working environment of the machine tool is generally more complicated and harsh, especially the atmosphere of coolant splashing, if improper pneumatic components are used, abnormal phenomena often occur, and CNC machine tools usually integrate mechanical, electrical, hydraulic, pneumatic and other functions. The integrated processing equipment has a close relationship with each part of the machine tool. Any part of the fault will affect the normal operation of other parts. There are thousands of components in the large CNC machine tool. It is difficult to check and repair the fault. It has always been one of the most difficult problems. Therefore, in the pneumatic design and application of machine tools, reliable and practical manufacturers and products must be selected.
NORGREN provides an automatic tool change solution for a machining center in Switzerland (see Figure 1). It uses ISO/VDMA cylinders designed according to the machine tool industry for tool selection and tool change. The cylinder is unique. The piston rod is made of austenitic stainless steel, which has good corrosion resistance, heat resistance and mechanical properties. The piston rod seal adopts special seals for waterproofing and oil proofing to ensure long-term trouble-free use of the cylinder. The valve adopts the precision sealed spool valve in accordance with ISO standard. The valve sleeve of the valve is hard anodized, with low friction, fast switching, and IP65 dustproof and waterproof grade, which can achieve long-term trouble-free use.
NORGREN is an application example of a machining center, using Norgren's patented products (see Figure 2, Figure 3), two Twin-Lintra rodless cylinders for automatic door opening and closing, this rodless cylinder has double slip The characteristics of the platform and the double stroke, the installation space only needs one quarter of the general cylinder, the speed can reach 2 m / s, the reciprocating stroke thrust balance, the speed is uniform, achieving the highest flexibility and space saving.
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