CN108732992B - Method for detecting errors of rotary table of machine tool of numerical control machining center - Google Patents
Method for detecting errors of rotary table of machine tool of numerical control machining center Download PDFInfo
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- CN108732992B CN108732992B CN201810342713.4A CN201810342713A CN108732992B CN 108732992 B CN108732992 B CN 108732992B CN 201810342713 A CN201810342713 A CN 201810342713A CN 108732992 B CN108732992 B CN 108732992B
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- rotary table
- main shaft
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/401—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by control arrangements for measuring, e.g. calibration and initialisation, measuring workpiece for machining purposes
Abstract
A detection method for errors of a rotary table of a machine tool of a numerical control machining center comprises a detection pin rod, wherein the end part of the detection pin rod is connected with a lever meter for detection; clamping and fixing the other end of the detection pin rod on a spring knife handle of the machine tool spindle, and returning the deflection angle of the machine tool spindle to zero; the machine tool main shaft is arranged in the center of the theoretical position of the machine tool rotary table, the Z-direction displacement of the machine tool main shaft is adjusted to enable the testing head of the lever meter to be arranged in the center hole of the machine tool rotary table, the testing head contacts the inner wall of the center hole of the machine tool rotary table, the machine tool main shaft is rotated, the testing head of the lever meter rotates for a circle around the inner wall of the center hole of the machine tool rotary table, and whether the machine tool rotary table has a rotation error and the error value is judged through the reading of the lever dial.
Description
Technical Field
The invention relates to a detection method of mechanical numerical control machining equipment, in particular to a method for detecting errors of a workbench of a numerical control machining center with a rotary workbench.
Background
In the field of current mechanical numerical control machining, due to the increasingly high requirements for digital manufacturing technology and product performance, a large number of high-precision numerical control machining centers are applied to actual production. The numerical control machining center, particularly the five-axis numerical control machining center, has the characteristics of a deflection type main shaft (a rotating shaft is attached to a machine tool main shaft) and a revolving body workbench (the rotating shaft is attached to the machine tool workbench), can freely convert machining stations on the premise of clamping parts once through the rotation of the main shaft and the workbench, has multiple parts to be machined and high dimensional precision, particularly has very obvious advantages in actual machining for machining a multi-cavity complex structural part with an opening and closing angle structure in multiple stations, can better realize the precision machining of products, and meets the requirement of product design.
The numerical control machining center has high requirements on precision, and a numerical control machine tool with excellent performance has the characteristics of small radial run-out of a main shaft, small axial play, small angle deflection error, small clearance error of rotation of a rotary worktable and each servo transmission link, high sensitivity, stable coordinate axis linkage function performance, small geometric precision error and the like. However, since the numerical control machine tool usually operates continuously, the precision of the machine tool is gradually reduced after the machine tool is used for two years due to unreasonable operation modes and errors of numerical control programs, such as unreasonable cutting parameters in the machining process, long-time large-allowance cutting, tool collision in the machining process and the like, one of the most common problems is that an error is generated when the rotary worktable operates, the accuracy of the rotary angle of the worktable cannot be guaranteed, the fault cannot be fed back to an operator through the numerical control machine tool, the operator cannot detect the rotary error through naked eyes, and the phenomenon of the size of a part is out of tolerance in the part machining process, so that the machining quality of a product is affected.
Therefore, a quick and simple detection method for the error of the rotary table is searched, and the method is very necessary for the precise machining of parts in the actual production process.
Disclosure of Invention
The invention aims to design a special tool, a method for simply and quickly detecting the error of a rotary worktable of a five-axis numerical control machine tool, and the method can be used for preventing the machine tool from influencing the processing quality of a product due to the error of the machine tool in daily work, so that the manufacturing requirement of the product is ensured.
A method for detecting errors of a rotary table of a machine tool of a numerical control machining center is characterized by comprising the following steps:
1) the end part of the detection pin rod is connected with a lever meter for detection;
2) clamping and fixing the other end of the detection pin rod on a spring knife handle of the machine tool spindle, and returning the deflection angle of the machine tool spindle to zero;
3) an operator moves the X axis and the Y axis of the rotary worktable of the machine tool back to zero, so that the main shaft of the machine tool is arranged in the center of the theoretical position of the rotary worktable of the machine tool, adjusts the Z-direction displacement of the main shaft of the machine tool to enable the side contact of the lever meter to be arranged in the central hole of the rotary worktable of the machine tool, the side contact is contacted with the inner wall of the central hole of the rotary worktable of the machine tool, the main shaft of the machine tool is rotated to enable the side contact of the lever meter to rotate for a circle around the inner wall of the central hole of the rotary worktable of the machine tool, and the rotation error.
The beneficial effect of this application lies in: the error of the rotary table of the machine tool is judged by utilizing the change of the fitting numerical value of the lateral contact of the lever indicator and the detected central hole, so that the error of the rotary table of the numerical control machine tool is quickly detected, the problem that the machined product generates large error due to the reduction of the precision of the machine tool in long-time continuous operation of the machine tool is avoided, and the product quality of machine tool machining can be effectively improved.
This application is described in further detail below with reference to the accompanying drawings of embodiments:
description of the drawings:
FIG. 1 is a schematic view of a detecting pin structure
FIG. 2 is a schematic diagram of a method for error detection of a rotary table of a CNC machining center
FIG. 3 is a schematic diagram of the principle of error monitoring for a rotary table of a CNC machining center
The numbering in the figures illustrates: 1 detecting pin rod, 3 machine tool main shaft, 4 rotary worktable, 5 lever indicator and 6 center hole
Detailed Description
Referring to the attached figure 1, the detection pin 1 is an alloy cylindrical rod with the diameter of 30mm multiplied by 400mm, and a threaded hole 2 is drilled at the bottom of the detection pin 1 and used for being connected with a lever indicator 5. The straightness requirement of the detection pin rod 1 is not more than 0.02, and the detection precision is guaranteed.
During detection, the lever meter 5 is fixed on the threaded hole 2 of the detection pin rod 1, the other end of the detection pin rod is clamped and fixed on the spring knife handle of the machine tool spindle 3, and the deflection angle of the machine tool spindle is reset to zero.
An operator moves the X axis and the Y axis of the rotary worktable of the machine tool back to zero, so that the main shaft of the machine tool is arranged in the center of the theoretical position of the rotary worktable of the machine tool, the Z-direction displacement of the main shaft of the machine tool is adjusted to enable the test head of the lever meter to be arranged in the center hole 6 of the rotary worktable 4 of the machine tool, the test head contacts the inner wall of the center hole 6 of the worktable, the main shaft of the machine tool is rotated, the test head of the lever meter rotates for a circle around the inner wall of the center hole 6 of the rotary worktable of the machine tool, the main shaft of the machine tool reads the numerical value on the dial (see figure 3), if the original point of the rotary worktable.
When the deviation value is within the allowable error range, the precision machining of the part can be carried out, and when the deviation value exceeds the allowable error range, a machine tool manufacturer customer service staff is required to carry out professional detection and correction zeroing on the machine tool precision.
Claims (2)
1. A method for detecting errors of a rotary table of a machine tool of a numerical control machining center is characterized by comprising the following steps:
1) the end part of the detection pin rod is connected with a lever meter for detection;
2) clamping and fixing the other end of the detection pin rod on a spring knife handle of the machine tool spindle, and returning the deflection angle of the machine tool spindle to zero;
3) an operator makes the X-axis and the Y-axis of the rotary worktable of the machine tool move back to zero, so that the main shaft of the machine tool is arranged in the center of the theoretical position of the rotary worktable of the machine tool, the Z-direction displacement of the main shaft of the machine tool is adjusted to make the testing head of the lever indicator arranged in the central hole of the rotary worktable of the machine tool, the testing head contacts the inner wall of the central hole of the rotary worktable of the machine tool, the main shaft of the machine tool is rotated, the testing head of the lever indicator rotates for a circle around the inner wall of the central hole of the rotary worktable of the machine tool, and the rotation.
2. The method for detecting the error of the rotary table of the machine tool of the numerical control machining center as claimed in claim 1, wherein the detection pin is a cylindrical rod with the diameter of 30mm x 400mm, a threaded hole is drilled in the bottom of the detection pin and used for being connected with the lever indicator, and the straightness of the pin is not more than 0.02.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810342713.4A CN108732992B (en) | 2018-04-16 | 2018-04-16 | Method for detecting errors of rotary table of machine tool of numerical control machining center |
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| CN201810342713.4A CN108732992B (en) | 2018-04-16 | 2018-04-16 | Method for detecting errors of rotary table of machine tool of numerical control machining center |
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| CN108732992B true CN108732992B (en) | 2021-02-09 |
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| CN114063563B (en) * | 2020-07-31 | 2023-12-15 | 富鼎电子科技(嘉善)有限公司 | Processing position compensation method, electronic device and storage medium |
| CN115338691B (en) * | 2022-06-17 | 2023-07-21 | 中航西安飞机工业集团股份有限公司 | Method for measuring feeding shaft error of numerical control machine tool |
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| CN101387495A (en) * | 2008-10-23 | 2009-03-18 | 天津大学 | Cylinder liner intelligent detection device |
| CN102476327A (en) * | 2010-11-22 | 2012-05-30 | 大连创达技术交易市场有限公司 | Novel method for eliminating positioning error of numerical control machine tool workbench |
| CN103372666B (en) * | 2012-04-26 | 2015-05-13 | 昆山江锦机械有限公司 | Processing method and concentricity measuring tool for coaxial hole of diesel engine oil supply unit casing |
| CN102756236B (en) * | 2012-07-11 | 2014-06-25 | 武汉船用机械有限责任公司 | Method for machining linear saddle groove of main cable saddle of suspension bridge |
| CN104827113A (en) * | 2014-11-27 | 2015-08-12 | 王晓冬 | Method of processing impeller on five-axis machining center |
| CN104759941B (en) * | 2015-04-02 | 2017-03-01 | 中航飞机股份有限公司西安飞机分公司 | A kind of detection method for numerical control machining center main shaft offset error |
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