CN-117260388-B - Real-time part excircle size compensation method based on off-board measurement

CN117260388BCN 117260388 BCN117260388 BCN 117260388BCN-117260388-B

Abstract

The invention belongs to the field of machining, and relates to a real-time compensation method for the outer circle size of a part based on off-machine measurement. The method of the invention is as follows, the actual excircle size and design tolerance of the part are obtained in real time, the real-time calculation of the compensation value is convenient, and the real-time compensation processing of the part is ensured. The method has the advantages that the compensation value of the outer circle size of the part is determined according to the actual outer circle size and the design tolerance of the part, the accuracy of the compensation value is guaranteed, the calculation efficiency of the compensation value is high, the calculation result is accurate, and the machining accuracy of the part is further guaranteed. Compensating the size of the outer circle of the part and the part is transmitted back to the machine tool to continue processing. The whole process realizes automatic closed-loop processing of processing, measuring and compensating processing, avoids stop line inspection of a production line, and improves production efficiency.

Inventors

Pan Tianhang
Ma Xuyao
KOU ZHIDA
SHI XIAOLIANG
ZHAO WENCHANG
TANG YONGPENG
Ji Menchen
ZHAO HAOHAO

Assignees

陕西法士特齿轮有限责任公司

Dates

Publication Date: 20260512
Application Date: 20231031

Claims (6)

1. The real-time part excircle size compensation method based on off-board measurement is characterized by comprising the following steps of: acquiring the actual excircle size and design tolerance of the part in real time; After the actual outer circle size of the part is obtained in real time, judging the reason of the outer circle size out of tolerance of the part by combining the actual outer circle size, if the reason of the out of tolerance is caused by tool tipping and workpiece chip winding, stopping the machine and alarming operation, and processing after checking and processing by an operator; determining a part excircle size compensation value according to the actual excircle size and design tolerance of the part, wherein the part excircle size compensation value is specifically as follows: setting a control tolerance on the basis of the design tolerance, wherein the control tolerance is smaller than the design tolerance, and calculating a part excircle size compensation value when the actual excircle size of the part exceeds the design tolerance so as to compensate the part size; the excircle size compensation value of the part is transmitted back to the machine tool to continue to process the part; the compensation value calculation formula is as follows: When the actual outside dimensions of the part are outside of design tolerances, Wherein: a compensation value for the over-design bias; The compensation value of the deviation under the super design is adopted; Is an actual measurement value; is a correction coefficient; is a control parameter; when the actual outside dimensions of the part are outside of the control tolerances and not outside of the design tolerances, Wherein: a compensation value for overriding the upper deviation; Is the compensation value of the deviation under the override; the range formula of the control tolerance is as follows: Wherein, the To control the upper deviation; to control the lower deviation; For design bias; For the design lower bias; Is the upper deviation offset; Is the lower offset.
2. The real-time compensation method for the outer circle size of the part based on off-machine measurement according to claim 1, wherein the cutter tipping judgment conditions are as follows: If the cutter is broken, then If the cutter is normal Wherein, the Is an actual measurement value; Is the deviation on the part; in order to adjust the coefficient of the power supply, 。
3. The real-time compensation method for the outer circle size of the part based on off-machine measurement according to claim 1, wherein the workpiece winding scrap judgment conditions are as follows: if the workpiece is entangled with scraps, then If the workpiece is normal Wherein, the As a result of the actual measurement value, In order to adjust the coefficient of the winding scraps, 。
4. The real-time compensation method for the outer circle size of the part based on off-machine measurement according to claim 1, wherein the compensation value is transmitted back to the machine tool in real time through a TCP/IP technology, and the actual outer circle size of the part is obtained in real time through the TCP/IP technology.
5. The method for real-time compensation of the outer circle size of a part based on off-machine measurement according to claim 1, wherein the machining error of the machine tool is required to be within a design tolerance.
6. The method for compensating the outer circle size of the part in real time based on off-machine measurement according to claim 5, wherein the machining error is the sum of machine tool positioning accuracy, thermal error, error caused by tool wear, machine tool dynamic error and measurement error.

Description

Real-time part excircle size compensation method based on off-board measurement Technical Field The invention belongs to the field of machining, and relates to a real-time compensation method for the outer circle size of a part based on off-machine measurement. Background With the development of industrial automation, the closed-loop production mode of processing-measuring-compensating in the production line is a research hot spot at home and abroad in recent years. The traditional three-coordinate off-line detection method is commonly used for precision detection of precision parts, but has the problems of errors caused by workpiece secondary clamping and limitation of overlong waiting for measurement results. In order to avoid similar problems, the cutter is replaced by the measuring head after the machining is finished, the error of a part is directly measured in the machine tool, the problems of three-coordinate secondary clamping and incapability of real-time compensation are avoided, and the realization of a machining-measuring-compensating integrated machining mode of a production line is facilitated. However, machine tool errors, namely geometric errors, thermal errors and the like, are introduced in the in-machine measurement, so that the measurement result does not coincide with the true value of the part, and the part is seriously disqualified. Therefore, according to the characteristics of the machined parts, corresponding detection equipment is additionally arranged in the production line, so that the size of the parts can be measured in real time, and meanwhile, the detection precision is ensured. Under the general condition, when the precision of the detected parts does not meet the design tolerance due to cutter abrasion, thermal errors and uncertain errors, the mechanical arm can pick the parts out and give an alarm to remind site workers of checking. The on-site workers need to stop the line to check whether the process system is abnormal or not, and adjust the tool compensation value to avoid the out-of-tolerance of parts. The method has the advantages that under the conditions of large part processing size and heavy production task, the processing beat of a production line is seriously influenced, and the production efficiency is influenced. Disclosure of Invention In order to overcome the defects of the prior art, the invention aims to provide a real-time compensation method for the outer circle size of a part based on off-machine measurement. In order to achieve the above purpose, the invention is realized by adopting the following technical scheme: the invention discloses a real-time compensation method for the outer circle size of a part based on off-board measurement, which comprises the following steps: acquiring the actual excircle size and design tolerance of the part in real time; determining a part excircle size compensation value according to the actual excircle size and the design tolerance of the part; compensating the size of the outer circle of the part and the part is transmitted back to the machine tool to continue processing. Further, after the actual outer circle size of the part is obtained in real time, the reason for the out-of-tolerance of the outer circle size of the part needs to be judged by combining the actual outer circle size, if the out-of-tolerance is caused by tool tipping and workpiece chip winding, a shutdown alarm operation needs to be carried out, and after the operation personnel check and process, the operation personnel process the workpiece. Further, the cutter tipping judgment conditions are as follows: If the cutter is broken, then di≥(1+λ)·dul,i;(i∈[1,4]) If the cutter is normal di<(1+λ)·dul,i;(i∈[1,4]) Wherein d i is the actual measured value, d ul is the part upper difference, lambda is the adjustment coefficient, lambda epsilon 0.001,0.005. Further, the workpiece winding scrap judging conditions are as follows: if the workpiece is entangled with scraps, then di≥(1+β)·dul,i;(i∈[1,4]) If the workpiece is normal di<(1+β)·dul,i;(i∈[1,4]) Wherein d i is the actual measurement value, beta is the regulation factor of the winding scraps, and beta is [2,15]. Further, determining the external circle size compensation value of the part according to the actual external circle size and the design tolerance of the part is specifically as follows: Setting a control tolerance on the basis of the design tolerance, wherein the control tolerance is smaller than the design tolerance, and calculating a part excircle size compensation value when the actual excircle size of the part is larger than the design tolerance so as to compensate the part size. Further, the compensation value is calculated as follows: when the actual outside circular dimensions of the part are greater than the design tolerances, Wherein Deltad ul is the compensation value of the over-design difference, deltad dl is the compensation value of the over-design difference, d is the actual measu