Stainless steel turning parts are the most commonly used technology for the turning of stainless steel parts. Take the common faults and solutions of thread turning as an example. In the actual thread turning, due to various reasons, there are problems in a certain link of the movement between the spindle and the tool, which causes the failure of turning thread and affects the normal production. It should be solved in time. Let us take a look at the common faults and solutions.
Failure analysis: The main reason for this problem is that the cutting edge of the turning tool is not smooth enough, or the cutting fluid, the cutting speed and the processing material do not match. Or the problem is cause by the vibration generated during the cutting of stainless steel turning parts.
Solution: Use oil or grinding wheel to fine grind the tool, select the matching cutting fluid and cutting speed, adjust the position of various parts to ensure the accuracy of the gap between guide rails, so as to prevent vibration during cutting.
Failure analysis: It is mainly due to the wrong installation position of the turning tool, either too high or too low, and the clamping of workpiece is not firm enough, and the turning tool wears too much.
Solution: Adjust the height of the turning tool so that the tip of the tool is as high as the axis of the workpiece.
Failure analysis: The cause is that when the lead screw rotates one circle, the workpiece has not rotated for an integer number of revolutions.
Solution:
(1) When the ratio of the lead screw pitch of the lathe to the screw pitch of workpiece is not an integral multiple, if the tool is retracted, the split nut is opened and the saddle is rocked to the starting position, and the split nut is closed again, then the tip of the tool will not be in the spiral groove that was cut out by the previous tool, resulting in disorder thread.
The solution is to use the forward and reverse turning method to retract the tool, that is, at the end of the first stroke, do not lift the split nut, after the tool is retracted in the radial direction, the main shaft is reversed, and the turning tool is retracted in the longitudinal direction, and then the second stroke begins. During the reciprocating process, because the transmission between the spindle, the lead screw and the tool post has not been separated, the turning tool is always in the original spiral groove, and there will be no disorder thread.
(2) For the thread whose ratio of the lead screw pitch of the stainless steel turning part to the wheel base of the workpiece is an integral multiple, the workpiece and the lead screw are rotating, after lifting the split nut, you must wait for the lead screw to turn at least one turn before closing the split nut again. In this way, when the lead screw is rotated once, the workpiece is rotated by an integer multiple times, and the turning tool can enter the spiral groove of the previous turning, and there will be no random buckling. In this way, the tool can be retracted manually by opening the split nut. In this way, the tool retracts quickly, which is beneficial to improve productivity and maintain the precision of the lead screw, and the lead screw is also safer.
Failure analysis and solutions:
(1) Improper matching of the hanging wheels or the wrong position of the handle of the feed box, resulting in the wrong thread length. You can re-check the position of the handle of the feeding box or check the change gear.
(2) Partially incorrect situation. Due to the local error of the screw pitch of lead screw of the lathe, the lead screw can be replaced or partially repaired.
Failure analysis: the penetration of the cutting tool is too big, the dial is inaccurate, and it is not measured in time.
Solution: During finish turning, check whether the dial is loose, ensure the finish turning margin is appropriate, the cutting edge of the turning tool is sharp, and that it should be measured in time.