Irregular machine plus parts processing calibration, no longer use rigid method

In machining machining parts, the workpiece alignment is the first step. The purpose is to make the workpiece centerline coincide with the machine center of rotation to ensure that the outer surface of the workpiece is concentric with the reference. The machining process of machine-added parts seems to be simple. In fact, the method of calibration and the speed of calibration adjustment play a key role in the processing quality and production efficiency of parts. This process can be easily done for parts with a relatively regular shape and calibration basis, but most of the parts are rough before processing, some of them are still irregular, the benchmark is difficult to find, and the difficulty of calibration is Large, especially irregular large parts, the problem is even more prominent.

First, the conventional calibration method

Since the workpiece is a blank forging, the shape is not only flat, but the margin is also uneven, so the calibration is very difficult. Before going to the lathe, the dash method is usually used to find the reference of the blank, that is, the workpiece is placed on the scribing table, and the waist line in both horizontal and vertical directions is drawn under the premise of ensuring the machining allowance everywhere. That is, the two center planes perpendicular to each other) XX, YY, as the calibration basis before turning. Then the workpiece is placed on the lathe, one end is clamped to the left end of the workpiece by the front chuck, and the other end is clamped to the tailstock with a small four-jaw chuck, and the plane where the calibration reference XX is located is roughly flattened, and is served at XX. Take two points A and B (the farther the two points are, the better), and then use the stylus to measure whether the two points are equal. If it is not equal, you can level the two points by adjusting the claws at both ends. Then move the stylus to the opposite side of the workpiece and check if the same waistline is equal to the front. If it is not equal, turn the chuck and change the height of the stylus to make the front and rear waistlines equal. At this time, only the plane where XX is corrected is parallel to the horizontal plane of the machine tool, and the workpiece is rotated through 180°. Check whether the height of the original waistline and the stylus disc are the same. If they are inconsistent, adjust the chucks at both ends. , repeated so many times, until the XX horizontal waist line coincides with the horizontal centerline of the machine tool. Then turn the workpiece through 90° to turn the other waistline Y-Y to the horizontal position. In the same way, the waist line is adjusted to coincide with the horizontal center plane of the machine tool, and the calibration process of the workpiece is completed at this time, which is time consuming and laborious.

Second, the improved calibration method If you use another method, the situation has changed a lot. The specific method is as follows: before the lathe on the workpiece, the small end center hole is first processed on the trampoline according to the scoring reference, and then the lathe is mounted on the lathe, and the workpiece is roughly flattened (visual inspection) after being clamped by a clip and a top. Then, by adjusting the height of the claws and the stylus disc, any two of the XX waist lines are moved away from the points M and N to the same height, as shown, thus completing the calibration in one direction. Then the workpiece is rotated through 90°, the other waist line Y-Y is leveled in the same way, and finally the adjustment process is completed to complete the entire calibration process, without the need to make a 180° turn-over calibration. Machine and parts processing can be completed.