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On-line measurement method of indentation depth on solder joint surface based on displacement signal between electrodes

A technology of displacement measurement and displacement signal, which is applied in the direction of measuring devices, welding equipment, auxiliary welding equipment, etc., can solve problems such as low efficiency, difficulty in meeting the needs of automatic production, and large impact on results, and achieve accurate measurement, fast calculation speed, hardware The effect of low system requirements

Active Publication Date: 2020-09-29
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the prior art, manual sampling is often used to check the indentation depth. This method is extremely inefficient, and the results are greatly affected by human factors, making it difficult to meet the needs of large-scale automated production.

Method used

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  • On-line measurement method of indentation depth on solder joint surface based on displacement signal between electrodes
  • On-line measurement method of indentation depth on solder joint surface based on displacement signal between electrodes
  • On-line measurement method of indentation depth on solder joint surface based on displacement signal between electrodes

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Experimental program
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Effect test

Embodiment 1

[0020] Such as figure 1 As shown, the present embodiment specifically measures the surface indentation depth of the spot welding joint through the following steps:

[0021] 1) Build a displacement measurement device to obtain the displacement-time evolution curve between electrodes.

[0022] Such as figure 2 As shown, the displacement measurement device includes: a first electrode 1, a second electrode 2, a first displacement sensor 3, a second displacement sensor 4, a signal acquisition module 5 and a calculation and analysis module 6, wherein: the electrodes 1 and 2 and the displacement sensor 3 and 4 are connected correspondingly through the installation aid 7, the input end of the signal acquisition module 5 is connected with the two displacement sensors 3 and 4 respectively, and the output end of the signal acquisition module 5 is connected with the calculation and analysis module 6, so as to realize the connection between the two electrodes 1 and 2 The displacement va...

Embodiment 2

[0036] Compared with Embodiment 1, the first electrode displacement sensor 3 adopts a reflective baffle, the second electrode displacement sensor 4 adopts a laser displacement sensor, the reflector is installed opposite to the laser displacement sensor, and the laser displacement sensor outputs an electrical signal, and The sensitivity is 1V / mm and the resolution is 1μm. The signal acquisition module 5 directly collects the electrical signal output by the second electrode displacement sensor 4 , and converts the unit to obtain an inter-electrode displacement-time evolution curve, and transmits it to the calculation and analysis module 6 .

[0037] The fitting function of this embodiment is: f(x)=A(1 / arctan(x+B)-2 / π)+C1, wherein: A, B, and C1 are undetermined coefficients and A is greater than 0. Since A(1 / arctan(x+B)-2 / π) is 0 when the independent variable x tends to infinity, C1 is the function value when the independent variable tends to infinity. The predicted value of the...

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Abstract

The present invention provides an online measurement method of a solder joint surface indentation depth based on displacement signals between electrodes. The real-time change of the relative positionof two electrodes in the process of resistance spot welding is measured to form a displacement-time curve chart, the curve is divided into five stags according to the curve features on the curve chart, the curve in the pressure maintaining stage after welding is subjected to curve fitting by employing the least square method to obtain a fitting function expression and calculate and correct the limit value of the fitting function, and the limit value is subtracted by the displacement measurement value between the electrodes in the prepressing stage prior to welding to obtain the predicted surface indentation depth of the solder joint. The linear association between the indentation depth prediction value and an actually measured value is good so that the depth of the surface indentation of the solder joint can be online predicted with high precision; the prediction method is fast in computing speed and low in hardware system requirement; and moreover, the problem is considered that the thickness of the workpiece is changed due to cooling shrinkage of the workpiece after the electrodes leave from the workpiece to make the prediction of the indentation depth more accurate.

Description

technical field [0001] The invention relates to a technique in the field of welding, in particular to an online measurement method for the indentation depth on the surface of a solder joint based on displacement signals between electrodes. Background technique [0002] The metal softens at high temperature, and under the action of the electrode pressure, an indentation on the surface of the solder joint will be formed. The indentation depth of solder joints is an important parameter index for evaluating the quality of resistance spot welding joints. If there is no indentation or the indentation is too shallow, it indicates that the joint nugget is formed or the nugget is too small, and the mechanical properties of the joint cannot meet the standard; if the indentation is too deep, it will affect the surface quality of the workpiece, increase the warping deformation of the workpiece, and affect the mechanical properties of the parts. Dimensional accuracy is often judged as a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/22B23K37/00
Inventor 夏裕俊苏泽炜楼铭周朗沈衍李永兵
Owner SHANGHAI JIAOTONG UNIV
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