Method for improving cone circle or cone hole machining speed

Abstract

The invention relates to a method for improving cone circle or cone hole machining speed. The method for improving the cone circle or cone hole machining speed comprises the following steps: (1) setting the center of the end face of a chuck as the original point of a tube blank workpiece, taking the axial direction of the tube blank as the Z axis direction and taking the radial direction of the tube blank as the X axis direction; (2) fixing the tube blank on the chuck and clamping the tube blank closely with a jack catch, the length of the portion extending out of the chuck of the tube blank is L+ delta1, wherein the L is the length of the portion extending out of the end face of the chuck of the tube blank after machining is completed and the delta1 is the allowance of the machining end face; (3) machining the end face of the tube blank and the external chamfer of that well successively; (4) setting the cutting starting point; (5) grilling the external circle of the tube blank with the order G34 by changing the screw pitch and increasing the feeding amount of a blade on the Z axis gradually in the external circle grilling process. When the method for improving the cone circle or cone hole machining speed is adopted in machining a cone circle, the machining speed of the cone circle is fast and production efficiency is high.

Description

technical field [0001] The invention relates to a production method for cold machining a cone or a tapered hole, in particular to a production method for increasing the processing speed of a cone or a tapered hole. Background technique [0002] When using CNC lathe to process the outer cone or inner cone hole, the programming method of FANUC CNC system is to pick up the outer cone or inner cone hole in the way of command G01X_Z_F_, followed by G01 (linear interpolation) followed by the F value of the cutting speed, no matter it is every Feed per minute, or feed per revolution, this F value is constant. [0003] The existing method of removing the outer cone or inner cone hole with G01X_Z_F_programming method has the following problems: [0004] (1) The processing speed is slow: the cone is as round as figure 1 As shown, the tapered hole is as figure 2 As shown, when cutting the tapered circle and the tapered hole, such as image 3 , Figure 4 As shown, the cutting amou...

AI Technical Summary

Problems solved by technology

[0004] (1) The processing speed is slow: the cone is as round as figure 1 As shown, the tapered hole is as figure 2 As shown, when cutting the tapered circle and the tapered hole, such as image 3 , Figure 4 As shown, the cutting amount is large at the beginning, and the F value of the feed rate at this time cannot be fast, otherwise the tool will be easily broken or the tool will be worn quickly. Tool life, the F feed rate is relatively low in general programming, which is obviously a waste of processing time;

[0005] (2) The service life of the tool is unstable: if only the processing speed of the entire outer cone or the outer cone hole is considered, the cutting speed F value is faster at the beginning of processing, the cutting amount is large, and the tool is prone to chipping;

[0006] (3) The precision of the processed product is poor: when processing the outer cone or inner cone hole, due to the change of the cross-sectional size, when the material cannot be displaced when it is clamped, its geometric shape and size will change, and when the material is deformed Internal reaction forces of equal size but opposite directions are generated to resist external forces, that is, stress

And when the workpiece is deformed due to temperature, humidity changes, etc. during processing, an interactive internal force is generated between the various parts of the object to resist the effect of this external cause, and try to make the object return from the deformed position to the pre-deformed position. position, due to the large amount of cutting at the beginning and the fast cutting speed, it is difficult to offset the change of internal stress (torsional stress, thermal stress, self-stress, etc.), resulting in large deformation of the material and increased ovality

When the thread is processed, it will produce a "cutting knife", which will cause the ellipticity of the processed thread to increase, which will increase the effective pitch diameter of the external thread and ring gauge of the pipe, and reduce the effective pitch diameter of the internal thread and plug gauge. This will affect the true close distance of the ring gauge. When the internal and external threads are mated, the torque curve will become a wavy curve, and the screwing torque is difficult to control, and the sealing performance of the internal and external threads will be reduced.

Images