The main reasons for fixture errors in the operation of water wheel rotary transfer machine are the low manufacturing accuracy of each fixture component, the low installation accuracy and the wear of the working surface of the fixture during use. The fixture error will directly affect the azimuth accuracy and scale accuracy of the workpiece surface, and the azimuth accuracy of the machining surface is more affected.

Under the effect of cutting force, power transmission, inertia force, clamping force and gravity, the general process system will have corresponding deformation, and then destroy the correct orientation between the adjusted tool and the workpiece, so that the workpiece has several shape errors and scale errors.

For example, when the water wheel rotary transfer machine turns a slender shaft, under the effect of cutting force, the workpiece presents the phenomenon of "letting the knife" due to elastic deformation, so that the workpiece has a cylindrical error. For example, when grinding the hole with the transverse cutting method on the internal grinder, because of the bending deformation of the main shaft of the internal grinding head, the grinding hole will show a cylindricity error with taper.

The useful methods often adopted in the production practice of water wheel rotary transfer machine are: reducing the surface roughness value of the diameter of the touch surface; Increase the touch area; Proper pre-tightening; Reduce touch deformation and improve touch stiffness; Reasonable placement of floor to improve the stiffness of part; Add auxiliary supports to improve workpiece stiffness, such as using center frame or tool holder to improve workpiece stiffness when turning slender shaft; Reasonable clamping workpiece, reduce clamping deformation, such as the use of open transition rings or special clamping jaws when processing thin-walled sleeves.

The above is the effective measures often taken for the accuracy error of the water wheel rotary transfer machine fixture. In fact, the water wheel rotary transfer machine clip has the accuracy error in addition to the above frequently taken measures. The development of the entire industry is also being promoted. The following four modernizations have emerged.

1. Standardization

Under the premise of universality, in order to reduce the cost of the fixture itself, it should be developed in the direction of standardization, that is, should be in the current national general fixture, combination fixture on the basis of the development of processing standards suitable for all kinds of fixtures, so that the machine tool fixture becomes a standardized machine tool supporting equipment, It is conducive to promoting the commercialization and large-scale production of the machine tool fixture itself and reducing the cost of the fixture itself.

2. Precision

With the higher and higher precision requirements of mechanical processing products in various industries, it is required that the CNC machine tool fixture should be developed in the direction of high precision, the precision of the fixture is mainly reflected in the design of the fixture structure, the current more precise fixture structure has three claws self-centering chuck, multi-toothed disc, etc., in the structural design of the fixture to give full play to the subjective initiative, In order to realize the development of machining in the direction of higher precision.

3. High efficiency

With the increasingly fierce competition in the modern machining industry, machining enterprises are required to maximize work efficiency, so the CNC machine tool fixture also put forward higher requirements, first of all, as the machine tool fixture to adapt to the requirements of high-speed processing, and minimize the auxiliary time of the fixture, in order to improve the labor productivity of the machine tool, maintain the continuity of processing and safe production, Replacing manpower with machinery greatly reduces the labor load of workers. For example, the use of three-jaw self-centering chuck on high-speed lathes to clamp the workpiece can adapt to the high speed processing conditions of nearly 10,000 RPM, and if the use of electric vise to clamp the workpiece, the efficiency is more than 5 times higher than that of human tooling, greatly improving the production efficiency of mechanical processing, which is conducive to achieving the profit goal of the enterprise.

4. Be flexible

The flexibility of fixture is through the scientific design of the structure of the fixture, the non-detachable mechanism into a detachable mechanism, so that it can meet the needs of various processes through its own combination and adjustment, a variety of combination fixtures, groups of fixtures are representative of flexibility, but with the high precision and high speed needs of modern machining. Simple flexible design has been powerless, so to design a more reasonable structure, higher precision, and can be automatically disassembled, replace the removable part of the fixture will greatly improve the efficiency of the fixture, so as to provide better support for modern processing.

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