According to the manufacturer of pilot CNC lathes, the main reasons for fixture errors in the operation of CNC lathes are the low manufacturing precision and installation precision of each fixture component, as well as the wear of the working appearance of the fixture in the process of use. The fixture error will directly affect the bearing accuracy and calibration accuracy of the workpiece surface, and the bearing accuracy of the machined surface will be affected more.

Pilot CNC lathe manufacturers said that CNC lathe jig precision error control often used useful methods are: reduce the surface roughness of the diameter of the contact surface; Increase the touch area; Appropriate preload; Reduce touch deformation, improve touch hardness; Appropriate layout bar, improve the rigidity of some parts; Increase the auxiliary support, improve the workpiece stiffness, such as using the center frame or tool rest turning slender shaft, improve the workpiece stiffness; Reasonable clamping workpiece, reduce clamping deformation. For example, when machining thin-wall sleeves, open transition rings or special grippers are used for clamping.


These are the effective measures often taken for precision errors of CNC lathe fixtures. The following development also uses error reduction.


Step 1 Standardize
CNC lathe manufacturers said that under the premise of universality, in order to reduce the cost of CNC machine tool jig, should develop to the direction of standardization, that is, on the basis of the current national general jig and combination of jig, the development of processing standards applicable to all kinds of jig, so that the jig becomes a standardized machine tool supporting equipment, conducive to promoting the commercialization and scale production of machine tool jig, Reduce fixture cost.


Step 2 Be precise
With the continuous improvement of product precision requirements in all walks of life, the requirements of CNC machine tool fixture to high precision direction. The precision of fixture is mainly reflected in the design of fixture structure. At present, more mature fixture structure has three claws self-centering chuck, multi - toothed disc, etc. The design of fixture should give full play to the subjective initiative to achieve high precision machining development.


3. High efficiency
With the increasingly fierce competition in the modern machining industry, the machining enterprises are required to improve the work efficiency to the greatest extent, so the CNC machine tool fixture put forward higher requirements. First of all, as a machine tool fixture, should be able to meet the requirements of high-speed processing, as far as possible to reduce the auxiliary time of fixture, in order to improve the labor productivity of machine tools, to maintain the continuity of processing and production safety, with machinery instead of manpower, thus greatly reducing the labor load of workers. For example, the use of three claws self-centering chuck on high-speed lathes to clamp the workpiece, can adapt to the high-speed processing conditions of nearly ten thousand revolutions per minute. Again, if the use of electric vise clamping workpiece, more than 5 times higher than human tool pliers efficiency, greatly improve the production efficiency of mechanical processing, help to achieve the profit goal of the enterprise.


Step 4 Be flexible
CNC lathe manufacturers said that fixture flexibility is through the scientific design of fixture structure, the non-detachable mechanism into a detachable mechanism, so that it through its own combination and adjustment to meet the needs of various processes. All kinds of combination fixture, group fixture is the representative of flexibility. However, with the modern machining of high precision, high speed requirements, simple flexible design has been powerless, so it is necessary to design more reasonable structure, higher precision, automatic disassembly and replacement of the fixture detachable part.