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Compensation method for perpendicularity error between feed shafts

A compensation method and verticality technology, which can be used in instruments, computer control, simulators, etc., and can solve problems such as long interpolation period.

Inactive Publication Date: 2014-09-10
江俊逢
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The complexity of the problem makes the imputation cycle significantly longer and unbearable

Method used

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  • Compensation method for perpendicularity error between feed shafts
  • Compensation method for perpendicularity error between feed shafts
  • Compensation method for perpendicularity error between feed shafts

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0142] Specific Embodiment 1 Perpendicularity Error Compensation for Incremental Associated Data Streams

[0143] The data flow correlation control found that in the real-time control process of the tool path curve, L division, as the digital image of the tool path curve, is a geometric invariant in discrete motion. There is no coupling relationship between the L division and the T division. The L division determines the geometric characteristics of the tool path curve, and the T division determines the processing efficiency and quality.

[0144] Therefore, the planning process of L-division and T-division is a non-real-time process. The core task of the PC system is to plan the L division and T division of the tool path curve.

[0145] L division and T division only depend on the geometric characteristics of the tool path curve and the kinematics / dynamic characteristics of the feed axis, and have nothing to do with the interpolation period of the real-time operating system. ...

specific Embodiment approach 2

[0167] Specific Embodiment 2 Perpendicularity Error Compensation of Step-Type Associated Data Stream

[0168] Step-by-step associative data flow fully embodies the essence of digital control. In particular, in the real-time control of the tool path curve, the synchronization of the start point and the end point is the intrinsic property of the step-type associated data flow. For the step-type associated data flow, the relevant feed axis either feeds a feed equivalent or does not feed, and its discrete position information is in the form of "1" and "0".

[0169] Table 2

[0170]

[0171] Table 2 is a schematic diagram of the 2-dimensional step-by-step associated data flow of the toolpath curve in the orthogonal discrete coordinate system x / y, where the x-axis is the active axis and the y-axis is the linkage axis. The discrete scale is e, and the tool path curve is a function of x and y.

[0172] In Table 2, time T is discretized into n timing points: t i (i=1,...,n). Th...

specific Embodiment approach 3

[0216] Specific Implementation Mode 3 Perpendicularity Error Compensation of Existing CNC System

[0217] In the existing CNC system based on the IEEE definition, the usual orthogonal coordinate system x / y is used. Under the control of the real-time operating system, in an interpolation cycle T i Perform real-time interpolation within to obtain the micro-line segment △L i The end point coordinates of or the step-by-step associative data flow of the relevant feed axis. Obviously, if the interpolation cycle is long enough or the main frequency of the CPU is high enough, the micro-line segment △L i The X coordinate compensation value of the end point △x i Compensation value with Y coordinate △y i , and the generation of the stepwise associated data stream can be performed in one interpolation cycle T i processed in real time. In this case, the above two perpendicularity error compensation methods are applicable to existing CNC systems based on IEEE definitions.

[0218] Th...

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Abstract

According to a numerically-controlled machine tool, the processing error and assembly error of components and the thermal deformation of components often lead to a problem that feed shafts are not vertical to each other, and then the resultant displacement of the feed shafts would generate a position error. According to an X-axis and a Y-axis in an X / Y coordinate workbench, a compensation method for a perpendicularity error between feed shafts is used for compensating the perpendicularity error due to the fact that feed shafts in a CNC system are not vertical to each other.

Description

technical field [0001] The invention belongs to the field of advanced manufacturing, and relates to a method for compensating perpendicularity errors in a computer numerical control system (Computer Numerical Control, CNC). technical background [0002] In the machinery manufacturing industry, especially in the machine tool manufacturing industry, how to minimize the geometric errors generated in the manufacturing process is always a very creative technical challenge. After the numerical control system came into being, it has become one of the core technologies in the numerical control system to use digital control technology to compensate the geometric error in real time when controlling the mechanical movement. [0003] Based on the existing CNC system defined by IEEE, the compensation of geometric errors in the mechanical system, such as backlash compensation, pitch error compensation, etc., is a necessary technical means to improve machining accuracy. In general, these ...

Claims

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Application Information

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IPC IPC(8): G05B19/404
Inventor 江俊逢
Owner 江俊逢
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