CN116214259A

CN116214259A - Multi-station five-axis machining workpiece position compensation method based on-machine measurement technology

Info

Publication number: CN116214259A
Application number: CN202111468352.6A
Authority: CN
Inventors: 于亮; 姚连梅; 冉伟亮; 刘军; 位忠生
Original assignee: Xi'an Jingdiao Software Technology Co ltd
Current assignee: Xi'an Jingdiao Software Technology Co ltd
Priority date: 2021-12-04
Filing date: 2021-12-04
Publication date: 2023-06-06

Abstract

A multi-station five-axis machining workpiece position compensation method based on an on-machine measurement technology comprises the following steps: 1) Establishing workpiece position deviation; 2) Selecting a workpiece position deviation processing mode; 3) Selecting a specific workpiece position deviation for compensation by a processing path; 4) Setting an angle limit of an active turntable; 5) And outputting a post-processing file, importing the file into machine tool system software, and automatically measuring and compensating the position deviation of the workpiece by the software according to the post-processing file. The invention provides an independent workpiece position deviation function, simplifies manual operation, supports the establishment of a plurality of workpiece position deviations and is suitable for multi-station working conditions, and supports various measurement characteristics and cyclic compensation, thereby improving measurement accuracy, and the output post-processing file can directly run on a machine tool to improve measurement operation efficiency and safety.

Description

Multi-station five-axis machining workpiece position compensation method based on-machine measurement technology

Technical Field

The invention relates to the field of multi-station five-axis machining, in particular to a multi-station five-axis machining workpiece position compensation method based on an on-machine measurement technology.

Background

How to obtain accurate workpiece position deviation and compensate is a very painful problem for production technicians, which is more prominent in five-axis machining, especially for workpieces with fuzzy references, and causes 'costly, time-consuming and material-consuming' effects. The existing solution is gradually changed from the combination of a precise jig and manual surface marking to on-machine measurement compensation at the end of a numerical control machine tool. The representative numerical control machine tool is a five-axis machining center (using Siemens 840D numerical control system) of the DMG DMU 50, and the workpiece position compensation of the workpiece with simple shape, higher feeding precision and small workpiece position deviation can be realized by using the manual combination of three functions of a calibration plane, a calibration edge and an edge of the numerical control system.

The traditional numerical control machine tool has few measurement characteristic types supported by the on-machine measurement compensation mode and has limitation in the measurement direction, and for workpieces with complex characteristics or special directivity requirements, the traditional mode can only be used for backing off, secondly, measuring the workpiece jig with simple characteristics, replacing the workpiece position deviation of the workpiece with the workpiece position deviation of the workpiece jig, and only compensating the workpiece with low precision. The traditional mode can only establish one workpiece position deviation compensation at a time, and is not suitable for the condition of multi-station processing. The traditional mode has no independent workpiece position deviation compensation function, a plurality of independent functions are required to be combined manually, each measuring point in the measuring operation process is required to be positioned to a safe position manually, the functions are dispersed, the operation is easy to make mistakes, the error is difficult to detect, and the measuring operation efficiency is low.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides a workpiece position compensation method for multi-station five-axis machining based on an on-machine measurement technology, which supports various measurement characteristics, can circularly compensate to improve measurement accuracy, simultaneously supports to establish a plurality of workpiece position deviations, can be applied to multi-station five-axis machining working conditions, can reduce manual operation, and can directly generate a related measurement path in software to improve measurement operation efficiency.

In order to achieve the above purpose, the technical scheme adopted by the invention comprises the following steps:

1) Establishing workpiece position deviation;

2) Selecting a workpiece position deviation processing mode;

3) Selecting a specific workpiece position deviation for compensation by a processing path;

4) Setting an angle limit of an active turntable;

5) Outputting a post-processing file, importing the file into machine tool system software, and automatically measuring and compensating the position deviation of the workpiece by the software according to the post-processing file;

further, step 1) establishes six ways of workpiece position deviation, including custom, three-face method, upper line point, two circles, revolution body, one groove, and the user selects one way to establish workpiece position deviation according to specific working condition.

Further, the two processing methods for selecting the workpiece position deviation in the step 2) are: a high-precision workpiece position deviation method and a high-efficiency workpiece position deviation method, one of which can be selected by a user. The high-precision workpiece position deviation processing mode comprises the following steps: and (3) controlling the circulation matching precision, and stopping measuring the related elements of the workpiece position deviation when the number of measurement circulation times is reached or the measurement precision is reached. The high-efficiency workpiece position deviation processing method comprises the following steps: in the process of the work piece position deviation loop iteration, only the first reference element is measured in a loop, and other elements are measured for 1 time.

Furthermore, step 1), step 2) and step 3) can simultaneously establish one or more workpiece position deviations, and the machining path can freely select any one of the workpiece position deviations for compensation.

Further, step 4) can ensure the safety of the machine tool movement when the workpiece position deviation is compensated to the machine tool by setting the active turntable angle limit.

Compared with the prior art, the invention has the beneficial effects that: the method supports various measurement characteristics, solves the problem that complex characteristics and characteristics with special directivity requirements cannot be directly measured, and expands the measurement range; the support is used for establishing a plurality of workpiece position deviations for compensating different stations in the workpiece, so that the compensation range is enlarged; the work piece position deviation establishment mode is simple and complete, the functions are concentrated, the manual participation degree is low, the operation program is automatically output, the stability of the operation result is improved, and the error rate is reduced.

Drawings

FIG. 1 is a flow chart of a method of compensating for workpiece position for multi-station five-axis machining of the present invention;

FIG. 2 is a schematic view of the present invention for generating a workpiece position deviation;

FIG. 3 is a schematic diagram of the custom method of the present invention;

FIG. 4 is a schematic representation of a three-sided process of the present invention;

FIG. 5 is a schematic diagram of the facial line dotting method of the invention;

FIG. 6 is a schematic diagram of a one-sided two-round approach of the present invention;

FIG. 7 is a schematic diagram of a gyratory body method of the present invention;

FIG. 8 is a schematic diagram of a one-slot process according to one aspect of the present invention;

FIG. 9 is a schematic diagram of a high precision process of the present invention;

FIG. 10 is a schematic diagram of a high efficiency process of the present invention;

FIG. 11 is a schematic diagram of a process path selection workpiece position deviation compensation according to the present invention;

FIG. 12 is a schematic view of the present invention with active turret angle limiting.

Detailed Description

The invention will be described in further detail with reference to the accompanying drawings, and the overall flow chart is shown in fig. 1.

1. Referring to FIG. 2, a workpiece positional offset is established

The method for establishing the position deviation of the workpiece is divided into a custom, three-face method, upper thread point, two circles on one face, a revolving body and one groove on one face.

1) Referring to fig. 3, the custom method is the basis of the rest modes, is flexible to use, and can be used for complex working conditions.

2) Referring to fig. 4, the three-sided method is applied to a condition with reference to three planes.

3) Referring to fig. 5, the upper line points apply to the reference, line, point conditions.

4) Referring to fig. 6, the one-face two-circle method is applied to the working condition of two circles with reference to one plane.

5) Referring to fig. 7, the gyrorotor method is applied to a condition where the workpiece geometry is a gyrorotor.

6) Referring to fig. 8, a one-sided slot approach is applied to conditions that are referenced to a face and slot type geometry.

2. Selecting a workpiece position deviation processing mode

1) Referring to fig. 9, a high precision processing method

And (3) controlling the circulation matching precision, and stopping measuring the related elements of the workpiece position deviation when the number of measurement circulation times is reached or the measurement precision is reached. And in the high-precision mode, all elements are circularly measured in the process of workpiece position deviation circular iteration. I.e., assuming a number of cycles of N, the number of measurements for all elements is the same (. Ltoreq.N). The high-precision processing method is used for working conditions with high precision requirements.

2) Referring to fig. 10, a high efficiency processing method

In the process of the work piece position deviation loop iteration, the high-efficiency mode only circularly measures the first reference element, and other elements are only measured for 1 time. Assuming that the number of loops is N, the first reference element loops N times, while the other elements are measured only 1 time. The high-efficiency processing method is used for working conditions with small rotation deviation of the workpiece position and high efficiency requirements.

3. The machining path selects a specific workpiece position deviation to compensate.

Referring to fig. 11, the processing path may select a corresponding workpiece position deviation for compensation processing.

4. Setting active turret angle limits

Referring to fig. 12, the active turntable angle limit is filled in, and when the active turntable angle exceeds the limit each time the workpiece position deviation is calculated, the machine tool can give an alarm prompt to determine the measurement operation safety.

5. And outputting a post-processing file, importing the file into machine tool system software, and automatically measuring and compensating the position deviation of the workpiece by the software according to the post-processing file, wherein the process does not need to be interfered manually.

Claims

1. The multi-station five-axis machining workpiece position compensation method based on the on-machine measurement technology is characterized by comprising the following steps of:

1) Establishing workpiece position deviation;

2) Selecting a workpiece position deviation processing mode;

4) Setting an angle limit of an active turntable;

5) And outputting a post-processing file, importing the file into machine tool system software, and automatically measuring and compensating the position deviation of the workpiece by the software according to the post-processing file.

2. The method for compensating the position of a multi-station five-axis machining workpiece based on the on-machine measurement technology according to claim 1, wherein the method comprises the following steps: the step 1) establishes six modes of workpiece position deviation, including self definition, three-face method, upper thread point, two circles on one face, revolving body and one groove on the other face.

3. The method for compensating the position of a workpiece for multi-station five-axis machining based on the on-machine measuring technique according to claim 1, wherein the selecting the workpiece position deviation processing mode in the step 2) includes two modes, wherein the high-precision workpiece position deviation processing method comprises the following steps: the circulation matching precision control is carried out, and when the measurement cycle times are reached or the measurement precision is reached, the measurement of the relevant elements of the position deviation of the workpiece is stopped; the high-efficiency workpiece position deviation processing method comprises the following steps: in the process of the work piece position deviation loop iteration, the high-efficiency mode only circularly measures the first reference element, and other elements are only measured for 1 time.

4. The method for compensating the position of a multi-station five-axis machining workpiece based on the on-machine measurement technology according to claim 1, wherein the method comprises the following steps: the steps 1), 2) and 3) can simultaneously establish one or more workpiece position deviations, and the machining path can freely select any workpiece position deviation for compensation.

5. The method for compensating the position of a multi-station five-axis machining workpiece based on the on-machine measurement technology according to claim 1, wherein the method comprises the following steps: and 4) ensuring the safety of the machine tool movement when the workpiece position deviation is compensated to the machine tool by using a method for limiting the rotation angle of the driving shaft.