1. Rough thread surface

Fault analysis: The main reason for this problem is that the cutting edge of the turning tool is not smooth enough, the cutting fluid, cutting speed and processing data do not match, or it may be caused by vibration during the cutting process.

Solution: Use oil or grinding wheel to polish the tool, select the matching cutting fluid and cutting speed, adjust the position of various parts, ensure the accuracy of the clearance of each guide rail, and prevent vibration during cutting.

2. Knife

Fault analysis: The main reason is that the installation position of the turning tool is wrong, either too high or too low, and the workpiece clamping is not strong, and the turning tool wears too much

Solution: Adjust the height of the turning tool so that the tool tip is the same height as the axis of the workpiece

3, random buckle

Fault analysis: The cause of the occurrence is that when the lead screw rolls for a week, the workpiece is not loaded with integers.

Solution:

(1) When the ratio of the lead screw pitch of the lathe to the workpiece pitch is not an integral multiple, if the tool is retracted, the opening and closing nut is selected and the saddle is shaken to the starting position. Then, when the opening and closing nut is closed again, a car will occur. The tip of the knife is not in the spiral groove made by the previous knife, resulting in random buckles. The solution is to use the forward and reverse turning method to retract the tool, that is, at the end of the first stroke, without lifting the opening and closing nut, after withdrawing the tool in the radial direction, reverse the spindle to make the turning tool retract in the longitudinal direction, and then carry out the first step. The second stroke, so that during the reciprocating process, because the transmission between the spindle, the lead screw and the tool holder has not been separated, the turning tool has been in the original spiral groove, and there will be no random buckles.

 (2) For the threaded workpiece and the lead screw whose ratio of the lead screw pitch of the turning part is an integral multiple of the workpiece pitch ratio, both the lead screw and the lead screw are rotating. After lifting the opening and closing nut, at least wait for the lead screw to turn once before opening and closing from the beginning. nut, so that when the lead screw turns one turn, the workpiece turns an integral multiple, and the turning tool can enter the spiral groove of the previous turning tool, and there will be no random buckles, so you can choose to open the opening and closing nut, and manually retract it. Knife. In this way, the tool retracts quickly, which is conducive to improving productivity and maintaining the accuracy of the lead screw, and the lead screw is also safer.

4. The pitch is wrong

Troubleshooting and solutions:

(1) Improper matching of the hanging wheel or the wrong position of the handle of the feeding box, resulting in the wrong full length of the thread, you can check the position of the handle of the feeding box or check the hanging wheel from the beginning.

(2) The part is incorrect, because the lead screw of the lathe itself is partially wrong, and the lead screw can be replaced or partially repaired.

5. The Chinese classics are wrong

Fault analysis: The reason is that the knife is too large, the dial is inaccurate, and it is not measured in time.

Solution: Check whether the dial is loose during fine turning, the fine turning allowance should be appropriate, the cutting edge of the turning tool should be sharp, and it should be measured in time.