With the rapid development of modern manufacturing technology, the application of numerical control technology is more and more common. CNC lathe has become an important production equipment of various machinery manufacturers, playing an irreplaceable role in production.
CNC lathes generally use a hydraulic chuck to hold the workpiece. Hydraulic chucks are usually equipped with unquenched jaws, so-called soft claws. The soft claw is divided into two types: inner clamp and outer clamp. The soft claw for clamping the workpiece when the chuck is closed is the inner clamp type soft claw, and the soft claw for supporting the workpiece when the chuck is opened is the outer clamp type soft claw. As shown in Fig. 1, the soft claw 1 is positioned by the face tooth groove and the claw base 3, and is fixed to the claw base 3 by a Screw and a T-nut in the claw base. When the hydraulic chuck is working, the soft claw is closed or opened by the claw seat to clamp or loosen the workpiece. When clamping different workpieces, change the clamping size of the hydraulic chuck by changing the position of the soft jaws on the jaws.
In the processing of large quantities of shaft or disc parts, in order to prevent damage to the machined surface and ensure the coaxiality of the workpiece between the clamping surface and the machined surface, the clamping surface of the hydraulic chuck soft claw must be turned a bit. The conventional method of turning the inner clamp type soft claw is as shown in Fig. 1. First, a circular support plate 5 is clamped inside the hydraulic chuck soft claw to support the soft claw, and then the clamping surface of the soft claw is turned, so that The diameter of the soft jaw clamping surface is approximately equal to the diameter of the workpiece being clamped. In order to make the central part of the soft-claw stroke the position of the workpiece, the soft-claws with different turning and clamping sizes are required to use different diameters of the support plate. Therefore, before turning the inner-claw soft claw, a variety of different sizes are required. Support plate. Since the support plate is clamped inside the soft claw, the clamping surface of the soft claw cannot be completely turned, and once the machining size is excessive, the new support plate has to be replaced, and the soft claw is reworked. When the soft claw is turned, the support plate is clamped inside the soft claw, and when the hydraulic chuck is actually working, the workpiece is clamped to the outside of the soft claw. Since the position of the soft claw is different, the grip surface of the soft jaw will become the shape of the bell when the workpiece is actually clamped, thereby affecting the reliable positioning and clamping of the workpiece.
In response to the above problems, we have designed a fixture for turning the hydraulic chuck of the hydraulic chuck through theoretical analysis and trial and error. The clamp can accurately fix the hydraulic chuck soft claw without the support plate and the collar, thereby turning the hydraulic chuck soft claw. The structural principle and usage of the fixture are now described below.
The jig is composed of a clip body 1, a slider type fixing pin 2, and a stopper 3. In the ring clamp 1 having a thickness of 10 to 15 mm and an outer diameter smaller than the diameter of the chuck, three arcuate grooves of different centers are respectively arranged in the circumference of the third, and each of the arc grooves is provided with a space in the groove. The sliding slider-type fixing pin 2 is fixed to the slider-type fixing pin 2 by screws. Three slider-type fixing pins will be inserted into the screw counterbore of the three soft jaws of the hydraulic chuck. When the hydraulic chuck is clamped, the three slider-type fixing pins can be automatically adjusted to the optimum position, so that the three soft jaws of the chuck are subjected to the same force. The sliding type fixing pin has a long slidable stroke in the curved groove, so the clamp can not only fix the soft claws of different clamping sizes, save the support plates of various different sizes, and can perform stepless fine adjustment. Minimize soft claw consumption. Since there is no obstruction of the support plate, the clamping faces of the soft claws can all be turned, so that when the workpiece is actually clamped, the deformation of the soft jaw clamping surface is small, and the clamping precision is high.
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