Focus on CNC lathe
Clamping the workpiece means positioning and clamping the workpiece on the CNC lathe or in the fixture CNC lathe in the turning process, the workpiece must rotate with the CNC lathe spindle, therefore, it is required that when clamping on the CNC lathe, the axis of the workpiece to be machined and the axis of the CNC lathe spindle must be coaxial, and the workpiece should be clamped to avoid the workpiece loosening or falling off under the action of the cutting force and causing accidents.
According to the shape, size and processing quantity of the workpiece, different clamping methods can be used to clamp the workpiece on the CNC lathe. The attachments used to load workpieces on CNC lathe are the same as self-centering chuck/single-action chuck, center, arbor, center frame, follow tool holder, chuck and angle iron, etc.
1. CNC lathe self-centering chuck clamping work
CNC lathe self-centering chuck is mounted on the spindle through the flange to clamp the workpiece. The small bevel gear rotates by inserting a square-head wrench into the square hole of the self-centering chuck, which drives the large bevel gear to rotate, and the large bevel gear drives the three jaws which are threaded with the disc on the back to move along the radial direction synchronously.
The characteristics of CNC lathe self-centering chuck are that the three jaws can automatically center the workpiece, and it is easy to clamp and correct the workpiece, but the clamping force is small, and it cannot clamp large and irregular workpieces.
The method of CNC lathe self-centering chuck to load workpieces has positive grip and reverse grip to load workpieces, when reverse grip clamping, the three grips will be removed and jumping installation can reverse grip to load larger diameter workpieces.
The jaws of the chuck are called hard jaws, which are hardened to have hardness. The claw made of non-hardened steel or copper and aluminum is called soft claw, generally welded on the hard claw, which is well positioned and not easy to pinch the workpiece, to be processed before use, turning or grinding can be.
2. CNC lathe single-action chuck for clamping workpiece
The four jaws of CNC lathe single-action chuck can move independently, because the back of each jaw has a half-flap internal thread and the screw engages, and the screw has a hole at the end.
When the chuck wrench is used to turn a certain side hole, the corresponding screw is driven to turn, and the jaws can be clamped or loosened. Therefore, the single-action chuck of CNC lathe can clamp workpieces with square/rectangular/elliptical cross-section and irregular shape, and can also turn eccentric shafts and holes. Therefore, the clamping force of single-action chuck for CNC lathe is larger than that of self-setting new chuck master long for clamping normal round workpiece with larger diameter.
CNC lathe with single-action chuck for clamping workpiece, because the four jaws are not synchronized can not be automatically centered, it needs to be carefully corrected so that the axis of the workpiece is aligned with the spindle rotation axis. The positioning accuracy is 0.2-0.5mm with the scribing disc according to the inner and outer round surface of the workpiece or the pre-drawn processing line; the positioning accuracy of 0.01-0.02mm can be achieved with the percentage table according to the finishing surface of the workpiece.
When the machining allowance of each part of the workpiece is uneven, focus on the part with less allowance, otherwise the workpiece will be easily scrapped.
CNC lathe single-action chuck can all use the positive grip or reverse grip to clamp the workpiece, but also can use one or two reverse grips, the rest still use the positive grip to clamp the workpiece.