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Length comparison difference value measurement method without accurate positioning

A measurement method and precise positioning technology, applied in the direction of measuring devices, instruments, optical devices, etc., can solve the problems of high price of measuring equipment, low measurement accuracy, cumbersome process, etc., achieve simple and feasible measurement method, reduce measurement conditions, The effect of improving measurement accuracy

Pending Publication Date: 2017-11-10
浙江机电职业技术学院
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Problems solved by technology

The process of measuring the shape and position tolerance of complex parts by this method is cumbersome and requires specialized personnel to measure, which has low efficiency and high price
[0005] Visual measurement method: A measurement system composed of digital camera, lens, light source, processing software, etc. is used to complete the size measurement of the measured workpiece. The measurement accuracy of this method is affected by changes in lens specifications, resolution, focal length, depth of field, light source, mechanism, etc. , the installation and debugging are more troublesome, the measurement accuracy of the size of the larger workpiece is not high, and the price of the measuring equipment is relatively high

Method used

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  • Length comparison difference value measurement method without accurate positioning
  • Length comparison difference value measurement method without accurate positioning
  • Length comparison difference value measurement method without accurate positioning

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Embodiment Construction

[0018] Below in conjunction with accompanying drawing, the present invention will be further described:

[0019] 1. Definition of standard workpiece length

[0020] like figure 1 As shown, the distance between any two points parallel to the datum plane on the plane is the principle of the plane length.

[0021] 1. Determine a standard workpiece whose length is L0.

[0022] 2. Select two points a and b as required, and the length between the two points is L0.

[0023] 3. Moving standard workpieces such as figure 2 , first make the measurement reference plane perpendicular to the measured reference plane, let the laser sensor measure to point a, and obtain a measurement reading Lma. Take the origin of the measuring platform as the coordinate origin to obtain the coordinate value Xa of the X-axis when point a is obtained, that is, point a (Lma, Xa).

[0024] 4. Move the standard workpiece to rotate 180° such as image 3 , let the laser sensor measure point b, obtain a meas...

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Abstract

The invention discloses a length comparison difference value measurement method without accurate positioning. The length comparison difference value measurement method without accurate positioning comprises steps of determining a standard workpiece, wherein the length of the workpiece is L0, also known as Lab, making a measurement reference plane perpendicular to a measured reference plane, making a laser sensor measure to an a point, obtaining reference data a point (Lma,Xa), rotating the standard workpiece for 180 degrees, making the laser sensor measure to b point (Lmb,Xb), using the above method to establish a relation between the standard workpiece, the length of which is L0, and the a point (Lma,Xa) and b point (Lmb,Xb), using the measurement method to measure data of two points a1, b1 that a workpiece having an unknown length chooses, obtaining data of the a1 point (Lma1,Xa1) and the b1 point (Lmb1,Xb1) through measurement, calculating a length of the workpiece through a following formula: a practical workpiece length La1b1=(Xa1-Xa)+(Lma1-Lma)+(Xb1-Xb)+(Lmb1-Lmb)+Lab. The length comparison difference value measurement method without accurate positioning uses a comparison difference value to calculate, reduces measurement conditions, improves measurement accuracy and improves a measurement speed.

Description

technical field [0001] The invention belongs to the field of non-contact measurement, and in particular relates to a method for measuring length comparison difference based on a laser sensor without precise positioning. Background technique [0002] At present, there are many methods for non-contact measurement of the geometric dimensions of workpieces, such as light curtain measurement method, multi-point measurement method, visual measurement method and so on. [0003] Light curtain measurement method: emit a beam of light from one end of the workpiece to be measured, illuminate the workpiece, and receive light from the other end of the workpiece to measure the size of the workpiece. This method is fast and accurate, and the workpiece does not need to be accurately positioned, as long as the workpiece is within the measurement range. Limited by the width of the measuring light source, the size of the parts detected by this method is limited; limited by the measurement met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/03
CPCG01B11/03
Inventor 黄文广张耀
Owner 浙江机电职业技术学院
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