CN-118123578-B - Approach detection processing method for machined part

CN118123578BCN 118123578 BCN118123578 BCN 118123578BCN-118123578-B

Abstract

The invention discloses an approach detection processing method for machined parts, which comprises the following steps of S1, machining two end faces of a large end and a small end of the machined part to be detected, S2, taking the small end face as a mounting end face and the large end face as a measuring reference face, taking a circle at the position of 5mm and the position of 10mm downwards along the inner circle surface of the small end face, measuring the diameter value of the small end face, and finally calculating a diameter calculated value of the inner circle surface at the measuring reference face according to the diameter measured value in a back-pushing manner, and calculating a theoretical diameter height value, S3, manufacturing a test form, S4, filling an actual measured value of the diameter in the test form, S5, machining the large end face again according to the theoretical diameter height P value, S6, repeating the steps S2 to S4, S7, machining the large end face again according to the theoretical diameter height P value until the P value approaches zero, and finishing the detection processing of the machined part. The approach detection processing method provides a new solution for processing the irregular thermal expansion parts.

Inventors

Pan Zhaochun
DAI SHULIN
TANG HAO
ZHAO XIN

Assignees

贵州欣宇泰科精密科技有限公司

Dates

Publication Date: 20260505
Application Date: 20240319

Claims (4)

1. The approach detection processing method for the machined part is characterized by comprising the following steps of: s1, machining a part to be detected, and machining two end faces of the large end and the small end of the part at one time by adopting a numerical control lathe; S2, firstly placing the machined part on a detection table, selecting a small end face as an installation end face, a large end face as a three-coordinate measurement reference face, taking a circle at a position 5mm and 10mm downwards along the inner circle surface of the measurement reference face as a measurement position, marking the circle as a point A and a point B respectively, measuring the diameter value of the point A as dA and the diameter value of the point B as dB, and reversely calculating the diameter calculated value of the point C on the inner circle surface at the measurement reference face by using the same taper and same inclination principle of a cone according to a three-point busbar fixing mode, marking the diameter calculated value as dC, determining the theoretical diameter position of the point C according to the diameter calculated value dC of the point C, and calculating the theoretical diameter height value P of the point C; S3, the inspector makes a check table according to the numerical value in the step S2, wherein the contents of the check table comprise a serial number, a theoretical diameter height P from the point C to the theoretical diameter position of the check table, a theoretical diameter value of the point C and an actual measured value of the diameter of the point C; s4, filling in an actual measurement value of the diameter of the C point at a corresponding position in the inspection form by an inspector; S5, according to the obtained value in the inspection table, a lathe operator reserves 5mm machining allowance according to the value of the theoretical diameter height P and reprocesss the large end face; S6, repeating the steps S2 to S4 by the inspector; s7, according to the obtained value in the inspection table, the lathe operator processes the large end face again according to the value of the theoretical diameter height P until the value of P approaches zero, and then the detection processing of the machined part is completed.
2. The method of claim 1, wherein in the step S2, when rounding is performed at a position 5mm and a position 10mm down along the inner circle surface of the machined part to be inspected, at least three sets of diameter values are required to be measured along the circumferential directions of the points A and B, respectively, and the diameter calculation value dC of the point C of the inner circle surface at the measurement reference plane is calculated by measuring the points on the plurality of equal-height sections so as to reduce errors and by reversing the measured values for each set of diameter values.
3. The approach detection processing method for machined parts according to claim 1, wherein in the step S5, a lathe operator performs milling for a plurality of times by adopting a numerical control lathe according to the obtained value in a check table, such as the theoretical diameter height P value is larger than 10mm, the machining allowance of 5mm, such as the theoretical diameter height P value is between 5 and 10mm, the machining allowance of 5mm is reserved, the numerical control lathe performs milling for the outer circumferential surface of the large end face of the machined part according to the milling thickness of 1mm, the numerical control lathe performs milling for a plurality of times until the theoretical diameter height P value is between 5 and 6mm, and the numerical control lathe performs milling for the outer circumferential surface of the large end face of the machined part according to the milling thickness of 0.1mm, so as to obtain the machining allowance.
4. The method of claim 1, wherein in step S7, the operator of the lathe performs milling on the outer circumferential surface of the large end face of the machined part by using a numerically controlled lathe in such a manner that the milling thickness is 1mm according to the obtained value in the inspection table, such as the theoretical diameter height P value is between 0 and 5mm, and the milling is performed until the P value approaches zero, thereby completing the inspection of the machined part.

Description

Approach detection processing method for machined part Technical Field The invention relates to the technical field of numerical control machine part detection, in particular to an approach detection processing method for machine parts. Background The machined part shown in fig. 1 is an irregular thermal expansion part and comprises a horn-shaped part with one end being a straight cylinder and the other end being a spline curve, wherein the part is made of a 4mm plate material with a blank and is manufactured through the procedures of plate rolling, welding, thermal expansion, manual correction and the like, and the thermal expansion process is to expand the straight cylinder part through a die by adopting a hot pressing process so as to form the horn-shaped part with one end being the straight cylinder and the other end being the spline curve. The difference in expansion amplitude causes uneven overall wall thickness of the part, and the larger the diameter, the thinner the wall thickness. Because the machined part is a thermal expansion part, the uniformity of the inner diameter of the part cannot be guaranteed due to the fact that the difference of manual correction is large although the manual correction is performed. In the concrete processing process, after the machining sequence is finished, the two ends of the part are required to be welded in a combined mode, the inner surface of the part after the combined welding is not processed, and the inner surface runner is smooth after the final part is welded, so that the requirement on the inner diameter dimensional tolerance of the two ends of the part is very high. As shown in figures 2 and 3, the inner diameter of one end of the section of the part is a straight line, the uniformity of the inner diameter of the part can be ensured by a thermal expansion die, machining is not needed, the other end of the section is a spline curve, and when the inner diameter of the end surface of the part is measured by adopting the conventional means, the main problems are that firstly, the inner diameter of the end surface of the part cannot be measured by directly using a caliper, the inner wall of the curved surface cannot be detected, and the inner diameter cannot be fixed and detected by adopting three-coordinate measurement, secondly, the inner diameter cannot be measured by adopting an indirect measurement method of subtracting the wall thickness dimension from the measured outer diameter, and the influence of the chamfer burrs of the outer diameter and the uncertainty of the wall thickness dimension are eliminated. Therefore, the existing conventional means cannot meet the requirement of directly measuring the inner diameter of the end face of the part, so that the inspection and measurement difficulty is increased. Therefore, in order to meet the processing and use requirements of such parts, the inspection and measurement difficulty is reduced, so that a detection processing method different from the prior art is provided to solve the above problems. Disclosure of Invention The invention aims at solving the problems in the background technology, thereby providing an approach detection processing method, which not only can reduce the inspection and measurement difficulty, but also can improve the processing efficiency and the processing precision of irregular thermal expansion parts by utilizing the principle of the same taper and the same inclination of a cone and by two approach measurements, thereby meeting the use requirements of the irregular thermal expansion parts, in particular to an approach detection processing method for machining the parts. In order to solve the technical problems, the technical scheme adopted by the invention is that the approach detection processing method for the machined part comprises the following steps of: s1, machining a part to be detected, and machining two end faces of the large end and the small end of the part at one time by adopting a numerical control lathe; S2, firstly placing the machined part on a detection table, selecting a small end face as an installation end face, a large end face as a three-coordinate measurement reference face, taking a circle at a position 5mm and 10mm downwards along the inner circle surface of the measurement reference face as a measurement position, marking the circle as a point A and a point B respectively, measuring the diameter value of the point A as dA and the diameter value of the point B as dB, and reversely calculating the diameter calculated value of the point C on the inner circle surface at the measurement reference face by using the same taper and same inclination principle of a cone according to a three-point busbar fixing mode, marking the diameter calculated value as dC, determining the theoretical diameter position of the point C according to the diameter calculated value dC of the point C, and calculating the theoretical diameter height value P of the point C; S3, the i