Since the end of the 20th century, modern manufacturing technology and mechanical manufacturing process automation have made considerable progress. In the constant innovation of machine tool fixtures, its functions are still very significant. Machine tool fixtures have a direct impact on the quality, productivity and product cost of parts processing. Therefore, no matter in traditional manufacturing or modern manufacturing systems, fixtures are important process equipment.
The correct selection of machine tool fixtures is conducive to ensuring the processing accuracy of the workpiece and stable product quality; it is conducive to improving labor productivity and reducing costs; it is conducive to improving the working conditions of workers and ensuring safe production; it is conducive to expanding the range of machine tools and achieving "one machine with multiple uses ".
I would like to recommend three types of CNC machine tool fixtures that can be prioritized for mass production:
1. Modular fixture
Modular fixture is also called "building block fixture". It consists of a series of standardized design, different functions, and different specifications and sizes of machine tool fixture components. Customers can quickly assemble various types of fixtures according to processing requirements, just like "building blocks". Types of machine tool fixtures. Because the modular fixture saves the time for designing and manufacturing special fixtures, and greatly shortens the production preparation time, it effectively shortens the small batch production cycle, that is, improves the production efficiency. In addition, the modular fixture also has the advantages of high positioning accuracy, large clamping flexibility, repeated use, energy saving and material saving in manufacturing, and low use cost.
Small batch processing, especially when the shape of the product is more complex, can give priority to using modular fixtures.
2. Electric permanent magnet fixture
The electric permanent magnet fixture is a new type of fixture designed by using new permanent magnet materials such as neodymium iron boron as the magnetic source and using modern magnetic circuit principles. A large number of machining practices show that electric permanent magnet fixtures can greatly improve the comprehensive machining efficiency of CNC machine tools and machining centers. The clamping and unclamping process of the electro-permanent magnet fixture only takes about 1 second, so the clamping time is greatly shortened; the positioning components and clamping elements of the conventional machine tool fixture take up a large space, while the electro-permanent magnet fixture does not take up space. Therefore, compared with conventional machine tool fixtures, electro-permanent magnet fixtures have a larger clamping range, which is conducive to making full use of the worktable and processing stroke of CNC machine tools, and is conducive to improving the comprehensive processing efficiency of CNC machine tools. The suction force of the electric permanent magnet fixture is generally 15~18Kgf/cm2, so it is necessary to ensure that the suction (clamping force) is sufficient to resist the cutting force. Generally, the suction area should not be less than 30cm², that is, the clamping force should not be less than 450Kgf.
3. CNC machine tool fixtures suitable for mass processing
Hydraulic/pneumatic fixture
The hydraulic/pneumatic fixture is a special fixture that uses oil pressure or air pressure as the power source to realize the positioning, support and compression of the workpiece through hydraulic or pneumatic components. The hydraulic/pneumatic fixture can accurately and quickly determine the mutual position of the workpiece, the machine tool, and the tool. The position accuracy of the workpiece is guaranteed by the fixture, and the machining accuracy is high; the positioning and clamping process is fast, which greatly saves the clamping and releasing of the workpiece. Time; At the same time, it has the advantages of compact structure, multi-station clamping, high-speed heavy cutting, and automatic control.
The above advantages of hydraulic/pneumatic fixtures make them particularly suitable for use in CNC machine tools, machining centers, and flexible production lines, especially for mass processing.
In summary, if a CNC machining enterprise wants to ensure the efficiency and quality of processing, it needs to scientifically determine the CNC machining plan according to the actual production and operation of the enterprise, reasonably determine the machine parameters, cutting parameters and processing routes and other indicators, and do a good job in the design of the fixture. Work, comply with the relevant technological process of CNC machining, so as to give full play to the advantages and characteristics of CNC machining, and help enterprises achieve higher economic benefits.