Numerical control system and method for improving thread turning speed and machining precision

Abstract

The invention relates to a numerical control system and method for improving the thread turning speed and machining precision. A thread machining program is input to a numerical control device which is used for controlling a tool of a machining device to operate, a thread type is input to the numerical control device, the tool retracting time of a solid moving shaft X and a solid moving shaft Z of the tool is calculated according to the thread type, the axial stroke planning of the solid moving shaft X and the solid moving shaft Z is carried out according to the tool retracting time, a shaft X interpolation command and a shaft Z interpolation command are generated respectively after interpolation calculation, the shaft X interpolation command and the shaft Z interpolation command are integrated to be a tool retracting program, and the tool retracting program and the thread machining program are integrated to be the final machining program. The purposes of improving machining efficiency, lowering development cost and simplifying the production procedure are achieved.

Description

technical field [0001] The invention relates to a numerical control system and a method thereof, in particular to a numerical control system and a method for improving thread turning speed and machining accuracy. Background technique [0002] The main application of lathe processing is mostly thread turning, but the current problems faced by thread turning are to improve the machining accuracy of the thread and the quality of the tool retraction during thread processing. The generation of complete teeth, where the invalid tooth refers to the pitch of the produced thread is less than the set thread pitch during thread turning. Pulling out the knife will leave an incomplete thread with too shallow thread depth; on the contrary, if the thread pitch and thread depth are both correct, it is called an effective thread. [0003] In general numerical control systems for lathes, the G codes of lathes can be divided into three systems: A, B, and C. The lathe G codes of system A are u...

AI Technical Summary

Problems solved by technology

When the tool 11 moves from the starting point 1C of tool retraction to the end point 1D of tool retraction, the movement of the tool 11 along the entity motion axis X and the entity motion axis Z must maintain a synchronous relationship. Therefore, in the relationship between the entity motion axis X and the entity motion axis Z Speed ​​planning needs to meet the speed in the composite direction. However, the speed of the tool 11 in the X direction of the physical motion axis starts to accelerate from a static state, and during the initial period of acceleration, it cannot reach the target speed in real time. Therefore, the tool 11 in the Z direction of the physical motion axis Reduced speed, which increases overall machining time and also leads to wrong thread pitch

[0009] like image 3 , the process of thread turning cycle processing: first, as shown in step 201, first input a thread turning cycle processing instruction, and then execute step 202, input a thread lead angle and a thread lead angle value according to the final required thread specification Afterwards, step 203 is executed, that is, according to the thread turning cycle processing command, thread lead angle and thread lead angle value input in step 201 and step 202, a thread turning cycle is first performed, and when a thread turning cycle is finished, Then go to step 204 to check whether the result of a thread turning cycle meets the specification. If not, go to step 205, that is, readjust the thread lead angle and the thread lead angle value again, and return to step 202 to input the thread again. lead angle and thread lead angle value, and execute steps 203 and 204 in sequence, and repeat steps 202 to 205 until the thread turning cycle processing results meet the specifications, then proceed to step 206, that is, according to the correct thread lead angle and thread lead angle The value of the lead angle of the thread starts to produce a large number of threaded workpieces. During the thread turning cycle process, the product specification must depend on the user's practical experience, but it is easy to cause processing errors based on the user's practical experience. In addition, repeated Correcting the thread lead angle and thread lead angle value and checking the thread processing results will also increase the overall processing time, which is not in line with the automation of numerical control

[0010] In the process of thread turning cycle processing, repeatedly adjusting the thread lead angle value and thread lead angle angle will not only increase the material consumption of the workpiece, but also increase the production cost, and because the processing process also depends on the user's practical experience, if the production is different For standard threads, it is also necessary to reset the thread lead angle value and thread lead angle angle and check the processing results again; in addition, the tool retraction path of the thread turning cycle processing path must be lowered along the Z direction of the entity movement axis, which will also cause The overall processing time increases, which not only increases the production cost in the long run, but also reduces the production efficiency

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