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Measuring method of outer contour shape of metal part and detecting method of processing precision

A technology of metal parts and measurement methods, applied in metal processing equipment, metal processing machinery parts, point coordinate measurement, etc., can solve the problem of low measurement accuracy and achieve high measurement accuracy

Inactive Publication Date: 2012-04-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention aims at the problem of low measurement accuracy caused by the limitation of the outer contour shape of the part and the radiation of the material of the part existing in the existing measurement method of the outer contour size of the part. The invention provides a method for measuring the outer contour shape of the metal part and Testing method of machining accuracy

Method used

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  • Measuring method of outer contour shape of metal part and detecting method of processing precision
  • Measuring method of outer contour shape of metal part and detecting method of processing precision
  • Measuring method of outer contour shape of metal part and detecting method of processing precision

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specific Embodiment approach 1

[0028] Specific embodiment one: a kind of method for measuring the outer contour shape of a metal part described in this embodiment, its specific steps are:

[0029] Step 1: Install the metal part to be tested on the CNC axis of the CNC machine tool, and make the distance between the end of the probe 2 and the surface of the metal part to be tested be greater than 10 μm;

[0030] Step 2: Apply a 5V DC voltage between the probe 2 and the metal part;

[0031] Step 3: Select multiple measurement points on the surface of the metal part to be measured;

[0032] Step 4: Obtain the coordinate parameters of each measurement point one by one, and complete the measurement of the external dimension parameters of the metal parts. The process of obtaining the coordinate parameters of each measurement point is:

[0033] Step 41: move the measuring head 2 to the normal line, the normal line is the normal line of the surface where the point to be measured is located and passes through the po...

specific Embodiment approach 2

[0040] Specific embodiment two: the detection method of the machining accuracy of a kind of metal part described in this embodiment, its concrete steps are:

[0041] Step A: Use 3D modeling software to carry out solid modeling of the standard data of the external dimensions of the metal parts to obtain a model of the standard data;

[0042] Step B: Establish a detection coordinate system according to the model of the standard data obtained in step A;

[0043] Step C: In the established detection coordinate system, perform path planning on the standard data, and obtain path planning information;

[0044] Step D: According to the path planning information obtained in step C, a method for measuring the outer contour shape of the metal part of the present invention is used to obtain the detection data of the outer dimension of the metal part to be measured;

[0045] Step E: comparing the detection data obtained in step D with the standard data obtained in step A, and obtaining th...

example 1

[0052] Example 1: The nominal size required by a feature of the design part is 10mm, and the error range is between -0.1mm--+0.1mm; when the measured data is within the range of 9.9mm--10.1mm, the part is considered to be Qualified; when the measured data is between 9.8mm---10.2mm, it is considered to be out of tolerance.

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Abstract

The invention provides a measuring method of outer contour shape of a metal part and a detecting method of processing precision, and relate to a precision detecting method of a metal part with contour features of a free-form surface. The method solves the problem of low measuring precision caused by limitations of the outer contour shape of the part and radiation of the part material of the existing measuring method of the outer contour size of the part. The measuring method comprises the following steps: enabling the distance between a metal part to be measured and a measuring probe to be more than 10mu m; adding 5V direct current voltage between the measuring probe and the metal part; selecting a plurality of measuring points on the surface to be measured; and obtaining the coordinate parameters of each measuring point. The detecting method of processing precision comprises the following steps: modeling the normal data of the part by a three-dimensional modeling software, analyzing the model of the normal data and obtaining detecting data by the measuring method; and analyzing the error of two kinds of data and obtaining the detecting result of the part. The invention is appliedto the precision detecting method of the part with contour features of the free-form surface.

Description

technical field [0001] The invention relates to a method for measuring the outer contour shape of a metal part and a detection method for machining accuracy, in particular to a precision detection method for a metal part with free-form surface contour features. Background technique [0002] Generally, in the quality inspection of parts, it is first necessary to check whether the outer contour size meets the design requirements; if it exceeds the design tolerance range, it is a substandard product. If the detection part is used as the detection standard of other parts or used to process other parts, the accuracy requirements of its outer contour dimensions are more stringent; taking EDM as an example, the accuracy of the forming electrode directly affects the accuracy of the processed parts , if the detected parts do not meet the design requirements, it will inevitably lead to out-of-tolerance of the corresponding processed parts or the workpieces to be tested in a single or ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23Q17/20G01B7/012
Inventor 王振龙迟关心李茂盛黄海鹏
Owner HARBIN INST OF TECH
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