A method of turning and repairing external threads using a CNC lathe under the condition of variable spindle speed

Abstract

A method for turning and repairing external threads using a numerically controlled lathe under the condition of variable spindle speeds, comprising: on a reference workpiece at a spindle speed n 1 , n 2 Turning the helix T with the same lead as the thread to be repaired 1 , T 2 ;Position tool tip at T 1 Middle part; turn the spindle to an angle so that the tip of the tool points to T 1 ;Move the tool tip so that it points to T 1 Adjacent T 2 ;pass A 1 、A 2 Calculate the coordinates of T 1 , T 2 Axial or circumferential deviation between, corrected in n 2 The following turning repair program to eliminate the axial or circumferential deviation; remove the reference workpiece; install the workpiece to be repaired and rotate the spindle to the angle position; move the tool tip to point to the tooth bottom position B of the thread to be repaired; calculate BA 1 The axial offset distance or circumferential deviation between, eliminate the axial offset distance or circumferential deviation; 1 , n 2 Get out of the car and fix it. The above method can be used to adjust the turning trajectory of the turning tool at different spindle speeds, so that the turning trajectory of the turning tool coincides with the trajectory of the thread to be repaired.

Description

technical field [0001] The invention relates to a thread maintenance method, in particular to a method for turning and repairing external threads using a numerically controlled lathe under the condition of variable spindle speed. Background technique [0002] A large number of threads are processed and repaired by oil drilling technology service companies every year. Oil pipe thread repair service itself is very necessary for the drilling industry to control equipment costs. Maintenance can prolong the service life of oil pipes and save equipment investment. The technical key point of oil pipe thread repair is to machine along the original helical line of the thread, not to completely remove and reprocess. [0003] For a long time, the industry has generally used special pipe lathes to process threads. Its advantages are simple structure and strong applicability. Its disadvantages are also obvious. The labor intensity of operators is high, the working environment is poor, an...

AI Technical Summary

Problems solved by technology

[0009] In view of the above-mentioned problems, it is necessary to provide a method for turning and repairing external threads using a CNC lathe under the condition of variable spindle speed, so as to solve the problem of thread chaotic thread threading when the CNC lathe is turning and repairing threads at variable spindle speeds, resulting in turning at different speeds. There is a deviation between the helical lines, resulting in the technical problem that the turning track of the turning tool does not coincide with the track of the thread to be repaired

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