Common Faults and Solutions on Threading by Turning
Threading is one of the most important machining operations for turning shafts, pipes, or other cylindrical parts with helical grooves, and is widely used in the manufacturing processes of motors, valves and other machines. Here are some common problems about threading with turning and the corresponding solutions.
1. Poor Thread Pitch
Problem: During the threading of the turning, the screw thread pitch is not consistent.
Solution:
(1) Proper adjustment of tool nose angle is essential.
(2) Changing the threading cutting speed will affect the value of thread pitch.
(3) Correctly set the threading range.
(4) Reasonable selection of the cutting tool and its parameters.
2. Poor Thread Quality
Problem: The quality of screw thread caused by turning is poor, with a rough surface, unequal depth and improper angle, as well as scratches and chip accumulations on the processed surface.
Solution:
(1) Reasonable selection and adjustment of the cutting parameters.
(2) Grasp the feed amount correctly according to different materials of the workpiece.
(3) Use the correct cutting tool.
(4) Make sure the auxiliary equipment is good and the lubrication works properly.
3. Tool Breakage
Problem: During turning threading, the cutting tool break suddenly.
Solution:
(1) Carefully check the size and quality of the cutting tool.
(2) Adjust the cutting speed, feed and cutting depth.
(3) Make sure there is enough pressure for the cutting tool.
(4) Select appropriate chip breaker.
(5) Check the workpiece material and its hardening condition.
(6) Make sure the lubrication works properly.
4. Poor Wear Resistance
Problem: The wear resistance of the cutting tools nose and flank surface is poor during the turning threading, leading to greatly reduced cutting performance.
Solution:
(1) Correctly select the cutting tool material.
(2) Pay attention to the feed rate and cutting speed to lower the cutting temperature.
(3) Apply enough pressure to the cutting tool.
(4) Make sure the lubrication works properly.
(5) Clean the surface of the cutting tool regularly.
As can be seen from the above discussions, there are various problems that may occur during the threading of turning, often due to wrong cutting tool selection and improper operation. Therefore, it is essential for practitioners to understand the characteristics of the workpiece materials, and make appropriate selection and adjustment for the cutting tool and its parameters.
