阅读说明：本技术 一种薄壁环形零件的在线测量补偿方法 (Online measurement compensation method for thin-wall annular part ) 是由 周代忠 袁昊 刘培科 刘德生 栗生锐 于 2021-08-06 设计创作，主要内容包括：一种薄壁环形零件的在线测量补偿方法,属于数控加工技术领域。所述一种薄壁环形零件的在线测量补偿方法包括：对机床内部在线测量系统的测头长度进行校准,校准后,使测头在线测量结果与对刀后刀具加工结果相同、同时精车加工环形零件的第一环带部位以及内型面以及加工环形零件外型面的第二环带部位。所述薄壁环形零件的在线测量补偿方法能够实现薄壁环形零件壁厚加工的有效控制。(An online measurement compensation method for a thin-wall annular part belongs to the technical field of numerical control machining. The online measurement compensation method for the thin-wall annular part comprises the following steps: and calibrating the length of a measuring head of an online measuring system in the machine tool, after calibration, enabling the online measuring result of the measuring head to be the same as the processing result of the tool after tool setting, and simultaneously finely turning a first annular belt part and an inner profile of the annular part and a second annular belt part for processing the outer profile of the annular part. The online measurement compensation method for the thin-wall annular part can effectively control the wall thickness processing of the thin-wall annular part.)

1. An online measurement compensation method for a thin-wall annular part is characterized by comprising the following steps:

s1, calibrating the length of a measuring head of the online measuring system in the machine tool;

s2, processing a first ring belt part of the outer profile of the annular part, specifically:

simultaneously, finely turning a first ring belt part and an inner molded surface of the annular part;

s3, processing a second ring belt part of the outer profile of the annular part, specifically:

s3.1, setting a plurality of measuring points on the surface of the first annular belt part close to the second annular belt part by taking the surface shape of the first annular belt part after finish turning as a reference;

s3.2, carrying out online measurement on each measuring point through a measuring head to obtain the measuring radius of each measuring point, and inputting the measuring radius of each measuring point into a set machine tool variable to form a group of continuous variable values;

s3.3, adjusting the outer profile milling program, and adjusting the fixed radius value of each measuring point to a corresponding variable value;

and S3.4, milling the second annular belt part according to the adjusted milling program.

2. The on-line measurement compensation method for the thin-wall annular part, according to claim 1, wherein in the step S2, the wall thickness tolerance of the annular part is within one half of the median difference during finish turning.

3. The method of claim 1, wherein the outer profile of the annular part comprises a first annulus region and a second annulus region; the first ring belt part is a part needing turning on the outer molded surface of the annular part, and the second ring belt part is a part needing milling on the outer molded surface of the annular part.

Technical Field

The invention relates to the technical field of numerical control machining, in particular to an online measurement compensation method for a thin-wall annular part.

Background

The annular case on the engine is basically a thin-wall part, the wall thickness tolerance of part of parts is required to be controlled to be about 0.1mm, for some annular parts with larger diameters, the deformation of the parts is often larger than a tolerance control value due to factors such as part structural rigidity and processing stress, especially the outer surfaces of some parts need to be milled in large quantity, the wall thickness control is difficult, the traditional method is to leave a margin for processing a knife, after the measurement by a wall thickness caliper, manual compensation and reprocessing are carried out, the parts with batch output can be designed into a special supporting clamp to reduce the processing difference of the wall thickness of the parts, but due to cutter relieving and other reasons, the wall thickness control also has problems, the processing process also needs manual measurement, and a new processing technology is urgently needed to solve the wall thickness control problem without manual intervention in the processing process.

Disclosure of Invention

In order to solve the technical problems in the prior art, the invention provides an online measurement compensation method for a thin-wall annular part, which enables the wall thickness processing of the thin-wall annular part to be effectively controlled.

In order to achieve the purpose, the technical scheme of the invention is as follows:

an online measurement compensation method for a thin-wall annular part comprises the following steps:

s1, calibrating the length of a measuring head of an online measuring system in the machine tool, and after calibration, enabling the online measuring result of the measuring head to be the same as the processing result of the tool after tool setting;

s2, processing a first ring belt part of the outer profile of the annular part, specifically:

simultaneously, finely turning a first ring belt part and an inner molded surface of the annular part;

s3, processing a second ring belt part of the outer profile of the annular part, specifically:

s3.1, setting a plurality of measuring points on the surface of the first annular belt part close to the second annular belt part by taking the surface shape of the first annular belt part after finish turning as a reference;

s3.2, carrying out online measurement on each measuring point through a measuring head to obtain the measuring radius of each measuring point, and inputting the measuring radius of each measuring point into a set machine tool variable to form a group of continuous variable values;

s3.3, adjusting the outer profile milling program, and adjusting the fixed radius value of each measuring point to a corresponding variable value;

and S3.4, milling the second annular belt part according to the adjusted milling program.

Further, in step S2, when finish machining is performed, the wall thickness tolerance of the annular part is within one-half of the median difference.

Further, the outer profile of the annular part comprises a first annulus region and a second annulus region; the first ring belt part is a part needing turning on the outer molded surface of the annular part, and the second ring belt part is a part needing milling on the outer molded surface of the annular part.

The invention has the beneficial effects that:

1) the invention realizes that the wall thickness control in milling can be automatically compensated according to the deformation condition of the part, the processing process is not interrupted, the automatic processing capability and efficiency are improved, the problems of manual intervention, compensation input error and the like caused by manual compensation processing while measuring by adopting wall thickness calipers in the prior art are eliminated, and the development requirement of automatic processing is met.

2) The invention solves the technical problems that the wall thickness control requirement of part of large-scale thin-wall annular parts is higher, but the wall thickness control of the parts is very difficult due to the processing deformation of the parts in the process of repeated turning and milling process conversion by means of optimizing process and program and on-line measurement and the like;

3) the invention is applied to engine parts in batches, successfully solves the problem of wall thickness processing, is common to aeronautical engine, has low dependence on equipment and meets the requirement of automatic development, and therefore has wider application prospect.

Additional features and advantages of the invention will be set forth in part in the detailed description which follows.

Drawings

FIG. 1 is a flow chart of an online measurement compensation method for a thin-wall annular part provided by the invention;

fig. 2 is a schematic illustration of a typical part according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In order to solve the problems in the prior art, as shown in fig. 1, the invention provides an online measurement compensation method for a thin-wall annular part, which comprises the following steps:

s1, calibrating the length of a measuring head of an online measuring system in the machine tool, and after calibration, enabling the online measuring result of the measuring head to be the same as the processing result of the tool after tool setting;

s2, processing a first ring belt part of the outer profile of the annular part, specifically:

simultaneously, the first annular belt part and the inner molded surface of the annular part are precisely machined, and the wall thickness tolerance of the annular part is within one half of the range of the median difference during the precise machining;

s3, processing a second ring belt part of the outer profile of the annular part, specifically:

s3.1, setting a plurality of measuring points on the surface of the first annular belt part close to the second annular belt part by taking the surface shape of the first annular belt part after finish turning as a reference;

s3.2, carrying out online measurement on each measuring point through a measuring head to obtain the measuring radius of each measuring point, and inputting the measuring radius of each measuring point into a set machine tool variable to form a group of continuous variable values, such as R1, R2, R3 and … of a Siemens numerical control system;

s3.3, adjusting the outer profile milling program, and adjusting the fixed radius value of each measuring point to a corresponding variable value;

and S3.4, milling the second annular belt part according to the adjusted milling program.

In the invention, the outer profile of the annular part comprises a first annular belt part and a second annular belt part; the first ring belt part is a part needing turning on the outer molded surface of the annular part, and the second ring belt part is a part needing milling on the outer molded surface of the annular part.

Example (b):

as shown in fig. 2, taking machining a typical part as an example:

firstly, calibrating the measuring head length of an online measuring system in a machine tool and the length of tool setting in the machine tool, so that the processing result of the tool after tool setting in the machine tool is the same as the online measuring result (part radius value);

secondly, the processing technology design of the annular part is carried out, the outer molded surface of the annular part comprises a first annular belt part and a second annular belt part, wherein,

when the first annular belt part is machined, the first annular belt part and the whole inner profile of the annular part are subjected to finish turning, the wall thickness of the part is ensured by turning in one process, and the tolerance of the wall thickness is close to the median difference as much as possible during machining;

before the second annular belt part is machined, namely before the final wall thickness control machining is carried out, the surface shape of the first outer annular belt part after turning is taken as a reference, the second outer annular belt part of the outer profile is milled to control the wall thickness, in order to enable the milling machining size and the turning machining surface to be synchronous, a wall thickness measuring point is set on the surface of the first annular belt part close to the second annular belt part at intervals of a rotating angle according to the deformation condition of a part, if the part is deformed greatly, the interval angle between two adjacent measuring points is small, for example, one measuring point is set at 10 degrees of the circumference, and 36 measuring points are set on the whole circumference; if the part deformation is small, the interval angle between two adjacent measuring points is large, for example, every 60 degrees of one measuring point is needed, and the whole part only needs to measure 6 points;

then, a measuring head of an online measuring system is adopted to perform online measurement on each measuring point to obtain a measuring radius, and the measuring radius is input into a set machine tool variable to form a group of continuous variable values, such as R1, R2, R3 and … of a Siemens numerical control system;

and finally, adjusting the milling program of the second annular belt part of the outer profile surface, adjusting the fixed radius value of each measuring point in the wall thickness control processing program of the milling program to the variable value corresponding to the measuring point, and milling the second annular belt part.

In the outer profile milling process, partial program codes of a fixed radius value are replaced by variable values:

......

N0060 G00 G90 X27.18 Y21.99 B61.92 S600 M03

N0070 Z750.11

N0080 Z550.11

N0090 G01 X0.0 Y12.1 Z＝R4 F50；Z542.17 F50

B80Z ═ R5; the variable value of the measuring point is used for replacing the original fixed radius value

B100Z ═ R6; the variable value of the measuring point is used for replacing the original fixed radius value

N0470B 118.008Z ═ R7; the variable value of the measuring point is used for replacing the original fixed radius value

Y12.5F100

N0500 G00 Z543.17

......

According to the invention, by using a numerical control machining program with compensation variables, no tool joint exists between the milling and turning of the outer profile of the annular part, and the outer profile of the annular part is completely connected with the surface of the deformed part, so that the wall thickness of the part is stably controlled.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.