One of the most common procedures for turning a part when turning a thread. This article uses the faults and solutions that are commonly encountered with turning threads. In the actual turning of the thread, due to various reasons, causing some problems in the movement between the spindle and the tool, causing a failure when turning the thread to affect the normal production, it should be promptly resolved. Here we come to understand the common faults and solutions
1, rough surface
Failure analysis: The main reason for this problem is that the cutting edge of the turning tool is not smooth enough, the cutting fluid, the cutting speed do not match the machining material, or the vibration generated during the cutting process.
Solution: Use oil or abrasive wheel to polish the tool and select the matching cutting fluid and cutting speed to adjust the position of various parts to ensure the accuracy of the gaps of each guide, so as to prevent the vibration generated during cutting.
2, sickle
Failure analysis: mainly due to the wrong position of the turning tool, either too high or too low, and the workpiece clamping is not solid, the tool wear too much
Solution: adjust the height of the turning tool so that the height of the tool tip and the workpiece axis first stroke, the lifting nut is not lifted, and after the knife is retracted in the radial direction, the spindle is reversed and the turning tool is retracted in the longitudinal direction. In the second stroke, during the reciprocating process, the drive between the spindle, the screw and the tool post is not separated, and the turning tool is always in the original spiral groove, and there will be no disorderly buckle.
(2) For threaded workpieces and screw rods where the screw pitch of the lathe turned to an integral multiple of the workpiece's value, the screw and the screw are rotating. After lifting the opening and closing nut, wait at least one turn for the screw to reclose the opening and closing. The nut, so that when the screw rotates one turn, the workpiece rotates an integral multiple, the turning tool can enter the spiral groove of the previous tool, and there will be no disorderly buckle, so that the opening nut can be used to manually retract Knife. This quick retraction will help improve productivity and maintain screw accuracy, while the screw is also safer.
4, the wrong pitch
Failure analysis and solution:
(1) Improper collocation of the hanging wheel or incorrect position of the feed box handle, resulting in wrong overall thread length, recheck the position of the feed box handle or checking the hanging wheel.
(2) Partially incorrect, due to the local error of the thread pitch of the lathe screw, the screw can be replaced or partially repaired.
5, the Central Plains are wrong
Fault analysis: The reason is that the knife is too large, the dial is not accurate, and it is not measured in time.
Solution: When finishing the car, it is necessary to check in detail whether the dial is loose, the remaining amount of the finishing car should be appropriate, the cutting edge of the turning tool should be sharp, and it is necessary to measure in time
3, buckle
Fault analysis: The reason for this is that when the screw rotates one revolution, the workpiece is not loaded with an integer.
Solution:
(1) When the ratio of the lead screw pitch of the lathe to the workpiece pitch is not an integral multiple, if the retracting nut is used to open the opening nut, the saddle will be shaken to the initial position. Then, when the closing nut is closed again, the car will happen. The tip of the knife is not in the spiral groove of the previous knife's car, resulting in disorderly buckles. The solution is to use the positive and negative method to retract the knife, that is, at the end of the