CN108608104B - Rapid detection device and method for space state of resistance spot welding electrode - Google Patents

Abstract

The invention relates to a device and method for rapid detection of the space state of resistance spot welding electrodes. A two-dimensional laser ranging sensor is used for non-contact measurement, an electrode contour curve is generated by a special software algorithm, and the angle offset and end of the upper and lower electrodes are automatically calculated. It can provide technical means for on-line detection and adjustment of spot welding electrodes. The detection device is composed of a two-dimensional laser ranging sensor, an adjustment base, a rotating arm, a portable detector, a rotary encoder and a bracket. The rotary encoder is installed in the center of the bracket, and its output shaft end is equipped with a rotary arm. The swivel arm can rotate 360° around the center of the stand, and its angular coordinates are determined by a rotary encoder. A sensor adjustment seat is installed on the upper end of the rotating arm, and a two-dimensional laser ranging sensor is installed on the adjustment seat. A portable detector is installed on the rotating arm, with its own display screen, which can display the detection curve of the electrode profile and the calculated values such as angle offset and end lateral offset in real time.

Description

Device and method for rapid detection of space state of resistance spot welding electrodes

technical field

The invention relates to the field of welding quality control, in particular to a technology for rapid detection of the space state of resistance spot welding electrodes in the technical field of equipment manufacturing and welding, in particular to a device and method for rapid detection of the space state of resistance spot welding electrodes.

Background technique

At present, the main welding process used in the production of traffic vehicle body is resistance spot welding, and each vehicle contains about thousands of welding points. Stable and reliable spot welding joints are the key to reflect the level of body manufacturing. Online monitoring of welding parameters during the welding process is already a key technology in the field of spot welding quality control.

In the process parameters of resistance spot welding, the spatial state of the upper and lower electrodes has a very important influence on the formation process of the nugget inside the spot welding joint. With the progress of the welding process, the upper and lower electrodes continue to accumulate a certain degree of wear, thickening, and bending. As a result, the contact state, pressure state and current distribution of the electrodes and the workpiece to be welded will affect the welding process, thereby affecting the joint welding. quality. Therefore, in the welding production process, the space state of the upper and lower electrodes needs to be checked regularly to ensure that their neutral, angular offset and other shapes meet the process requirements. At present, most of the detection methods for the spatial state of spot welding electrodes are qualitative methods such as templates, which are insufficient in detection accuracy, which seriously restricts the development of spot welding quality control. Therefore, how to quickly and accurately perform online detection and adjustment of the spot welding electrode space state is the key technology to further improve the welding quality of resistance spot welding.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a rapid detection device and method for the space state of a resistance spot welding electrode, which solves the above problems existing in the prior art. The invention uses a two-dimensional laser ranging sensor to perform non-contact measurement, generates electrode contour curves through software algorithms, and automatically calculates the angular offset of the upper and lower electrodes, the lateral offset of the ends and other spatial states, which is the online detection and detection of spot welding electrodes. Adjustment provides technical means.

The above-mentioned purpose of the present invention is achieved through the following technical solutions:

The resistance spot welding electrode space state rapid detection device includes a two-dimensional laser ranging sensor 1, an adjustment base 2, a rotating arm 3, a portable detector 4, a rotary encoder 5 and a bracket 6, and the rotary encoder 5 is installed on the bracket. 6 center, a rotating arm 3 is installed on the output shaft end of the bracket 6; a portable detector 4 is installed on the rotating arm 3; 5. Determine its rotation angle; the upper end of the rotating arm 3 is provided with an adjustment seat 2 of the sensor, and the two-dimensional laser ranging sensor 1 is installed on the adjustment seat 2.

The two-dimensional laser ranging sensor 1 is a high-precision linear profile measurement sensor, which can feed back the position of each profile point on a straight line through the time difference of laser propagation during the laser emission and reception process.

The rotary encoder 5 is a photoelectric rotary encoder, which can output the rotation angle of the output shaft to the portable detector 4 .

The portable detector 4 has its own display screen 41, which is connected to the two-dimensional laser ranging sensor 1 and the rotary encoder 5 through a signal line, and can display the detection curve of the electrode contour, the angle offset, the lateral offset of the end, etc. in real time. Calculated.

Another object of the present invention is to provide a method for rapidly detecting the space state of a resistance spot welding electrode, comprising the following steps:

Step (1), during the detection, place the whole set of resistance spot welding electrode space state rapid detection device under the welding tongs, so that the rotation center of the bracket 6 faces the electrode;

Step (2), adjust the posture of the adjustment seat 2 left and right, so that the auxiliary light 11 emitted by the two-dimensional laser ranging sensor 1 coincides with the axis of the upper electrode or the axis of the lower electrode;

Step (3), rotate the rotating arm 3 to drive the two-dimensional laser ranging sensor 1 to the first angular position to be detected;

Step (4), at the first detection angle position, the two-dimensional laser ranging sensor 1 emits an auxiliary light 11 along the electrode axis and projects it to the side of the electrode, and simultaneously measures the side profile of the electrode corresponding to the auxiliary light 11; the two-dimensional laser ranging sensor 1. The distance direction from the electrode is the X direction, and the electrode axis direction is the Z direction; the display screen 41 of the portable detector 4 displays the electrode side profile curve corresponding to the auxiliary light 11 in real time, and automatically calculates the upper and lower electrodes at the current detection angle position. The relative axis inclination angle θ of the upper and lower electrodes and the end offset Δ of the upper and lower electrodes;

Step (5), manually adjust the angle position of the rotating arm 3, so that the two-dimensional laser ranging sensor 1 rotates to the second detection angle position along the electrode axis, and the angle value is obtained by the encoder 5 at the same time; repeat step (4), measure the second Detect the contour curve at the angular position and calculate the relative axis inclination and the offset of the electrode end;

Step (6), repeat step (5) until the detection of all required angular positions is completed.

The beneficial effect of the present invention is that: according to the requirement of fast detection of the working state of the resistance spot welding electrode, the present invention realizes the convenient online detection of the upper and lower electrodes of the resistance spot welding equipment through the non-contact measurement of the outer contour of the electrode and the rapid calculation of the axis, which greatly improves the The quality control effect of resistance spot welding.

Description of drawings

The accompanying drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The schematic examples of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

1 is a schematic structural diagram of a device for rapid detection of the working state of a resistance spot welding electrode according to the present invention;

Fig. 2 is the schematic diagram of end adjustment and motor space state detection of the device for rapid detection of the working state of the resistance spot welding electrode according to the present invention;

3 is a schematic diagram of the measurement angle transformation of the resistance spot welding electrode working state rapid detection device of the present invention;

FIG. 4 is a schematic diagram of the electrode axis and end offset calculation principle of the present invention.

In the figure: 1. Two-dimensional laser ranging sensor; 11. Auxiliary light; 2. Adjustment base; 3. Rotating arm; 4. Portable detector; 41. Display screen; 5. Rotary encoder; 6. Bracket; θ , the relative axis inclination angle of the upper and lower electrodes; Δ, the end offset of the upper and lower electrodes.

Detailed ways

The details of the present invention and the specific implementations thereof will be further described below with reference to the accompanying drawings.

Referring to Figures 1 to 4, the device and method for rapid detection of the space state of resistance spot welding electrodes of the present invention use a two-dimensional laser ranging sensor for non-contact measurement, generate electrode contour curves through special software algorithms, and automatically calculate the upper and lower Spatial states such as the angular offset of the electrode and the lateral offset of the end provide technical means for the on-line detection and adjustment of spot welding electrodes. The detection device is composed of a two-dimensional laser ranging sensor, an adjustment base, a rotating arm, a portable detector, a rotary encoder and a bracket. The rotary encoder is installed in the center of the bracket, and its output shaft end is equipped with a rotary arm. The swivel arm can rotate 360° around the center of the stand, and its angular coordinates are determined by a rotary encoder. A sensor adjustment seat is installed on the upper end of the rotating arm, and a two-dimensional laser ranging sensor is installed on the adjustment seat. A portable detector is installed on the rotating arm, with its own display screen, which can display the detection curve of the electrode profile and the calculated values such as angle offset and end lateral offset in real time.

1, the resistance spot welding electrode space state rapid detection device of the present invention includes a two-dimensional laser ranging sensor 1, an adjustment base 2, a rotating arm 3, a portable detector 4, a rotary encoder 5 and a bracket 6, The rotary encoder 5 is installed in the center of the bracket 6, and the output shaft end of the bracket 6 is equipped with a rotating arm 3; the rotating arm 3 is equipped with a portable detector 4; Rotate 360°, and determine its rotation angle through the rotary encoder 5; the upper end of the rotating arm 3 is equipped with a sensor adjustment base 2, and the two-dimensional laser ranging sensor 1 is installed on the adjustment base 2.

The two-dimensional laser ranging sensor 1 is a high-precision linear profile measurement sensor, which can feed back the position of each profile point on a straight line through the time difference of laser propagation during the laser emission and reception process.

The rotary encoder 5 is a photoelectric rotary encoder, which can output the rotation angle of the output shaft to the portable detector 4 .

The portable detector 4 has its own display screen 41, which is connected to the two-dimensional laser ranging sensor 1 and the rotary encoder 5 through a signal line, and can display the detection curve of the electrode contour, the angle offset, the lateral offset of the end, etc. in real time. Calculated.

Referring to FIG. 2 and FIG. 3 , the method for quickly detecting the space state of a resistance spot welding electrode of the present invention includes the following steps:

Step (1), during the detection, place the whole set of resistance spot welding electrode space state rapid detection device under the welding tongs, so that the rotation center of the bracket 6 faces the electrode;

Step (2), adjust the posture of the adjustment seat 2 left and right, so that the auxiliary light 11 emitted by the two-dimensional laser ranging sensor 1 coincides with the axis of the upper electrode or the axis of the lower electrode;

Step (3), rotate the rotating arm 3 to drive the two-dimensional laser ranging sensor 1 to the first angular position to be detected;

Step (4), at the first detection angle position, the two-dimensional laser ranging sensor 1 emits an auxiliary light 11 along the electrode axis and projects it to the side of the electrode, and simultaneously measures the side profile of the electrode corresponding to the auxiliary light 11; the two-dimensional laser ranging sensor 1. The distance direction from the electrode is the X direction, and the electrode axis direction is the Z direction; the display screen 41 of the portable detector 4 displays the electrode side profile curve corresponding to the auxiliary light 11 in real time, and automatically calculates the upper and lower electrodes at the current detection angle position. The relative axis inclination angle θ of the upper and lower electrodes and the end offset Δ of the upper and lower electrodes;

Step (5), manually adjust the angle position of the rotating arm 3, so that the two-dimensional laser ranging sensor 1 rotates to the second detection angle position along the electrode axis, and the angle value is obtained by the encoder 5 at the same time; repeat step (4), measure the second Detect the contour curve at the angular position and calculate the relative axis inclination and the offset of the electrode end;

Step (6), repeat step (5) until the detection of all required angular positions is completed.

Referring to FIG. 4 , when detecting at the angular position to be detected, the two-dimensional laser sensor 1 measures the side profile of the electrode corresponding to the auxiliary light 11 in real time, and generates a profile curve. The distance direction from the two-dimensional laser sensor 1 to the electrode is the X direction, and the electrode axis direction is the Z direction. The profile curve is displayed on the display screen 41 of the portable detector 4 in real time, and the relative axis inclination angle θ of the upper and lower electrodes and the end offset Δ of the upper and lower electrodes are automatically calculated.

Example:

The following is an example of the detection of welding tongs used in the production of spot welding of stainless steel car bodies:

(1) The type of welding tongs is C type, the detection range is 0~180°, and there is a detection position every 30°. The two-dimensional laser sensor 1 has an X-direction range of 50mm, a Z-direction range of 120mm, and a measurement accuracy of 50um.

(2) When testing, place the entire set of resistance spot welding electrode space state rapid detection device under the welding tongs, so that the rotation center of the bracket 6 faces the electrode.

(3) Adjust the posture of the adjusting seat 2 left and right so that the auxiliary light 11 emitted by the two-dimensional laser ranging sensor 1 coincides with the axis of the upper electrode or the axis of the lower electrode.

(4) Rotate the rotating arm 3 to drive the two-dimensional laser ranging sensor 1 to the angle to be detected.

(5) At the angular position to be detected, the two-dimensional laser ranging sensor 1 emits an auxiliary ray 11 along the electrode axis and projects it to the side of the electrode, and simultaneously measures the profile of the side of the electrode corresponding to the auxiliary ray 11 . The distance direction from the two-dimensional laser ranging sensor 1 to the electrode is the X direction, and the electrode axis direction is the Z direction. The profile curve is displayed on the display screen 41 of the portable detector 4 in real time, and the relative axis inclination angle θ of the upper and lower electrodes in this direction and the end offset Δ of the upper and lower electrodes are automatically calculated.

(6) Manually adjust the angular position of the rotating arm 3, so that the two-dimensional laser ranging sensor 1 rotates along the electrode axis by a certain angle (the angle value is obtained by the rotary encoder 5). Repeat the previous step, measure the profile curve in the angular direction and calculate the relative axis inclination and the offset of the electrode end until the detection of all required angular positions is completed.

Under the normal use conditions described in this example, the electrode angle error is less than or equal to 0.1°, the end offset error is less than or equal to 0.05mm, and the time consumed for each position detection is less than or equal to 5s. .

The above descriptions are only preferred examples of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made to the present invention shall be included within the protection scope of the present invention.

Claims (5)

1. A resistance spot welding electrode space state rapid detection device, characterized in that it comprises a two-dimensional laser ranging sensor (1), an adjustment base (2), a rotating arm (3), a portable detector (4), a rotating An encoder (5) and a bracket (6), the rotary encoder (5) is installed in the center of the bracket (6), and a rotating arm (3) is installed at the output shaft end of the bracket (6); the rotating arm (3) is installed on the There is a portable detector (4); the rotating arm (3) can drive the portable detector (4) to rotate 360° around the center of the bracket (6), and the rotating arm (3) determines its rotation angle through the rotary encoder (5); An adjustment seat (2) of a two-dimensional laser ranging sensor is installed on the upper end of the rotating arm (3), and the two-dimensional laser ranging sensor (1) is installed on the adjustment seat (2). 2 . The rapid detection device for the spatial state of resistance spot welding electrodes according to claim 1 , wherein the two-dimensional laser ranging sensor ( 1 ) is a high-precision linear profile measurement sensor, which can transmit and receive laser light. 3 . The time difference of laser propagation in the process feeds back the position of each contour point on a straight line. 3. The resistance spot welding electrode space state rapid detection device according to claim 1, characterized in that: the rotary encoder (5) is a photoelectric rotary encoder, which can output the rotation angle of the output shaft to the portable detection device Instrument (4). 4. The resistance spot welding electrode space state rapid detection device according to claim 1, characterized in that: the portable detector (4) has its own display screen (41), which is connected to a two-dimensional laser ranging sensor through a signal line (1) It is connected with the rotary encoder (5), and the detection curve of the electrode profile, as well as the angle offset and the end lateral offset are displayed in real time. 5. A resistance spot welding electrode space state rapid detection method using the resistance spot welding electrode space state rapid detection device described in any one of claims 1-4, characterized in that: comprising the steps: Step (1), during the detection, place the entire set of resistance spot welding electrode space state rapid detection device under the welding tongs, so that the rotation center of the bracket (6) faces the electrode; Step (2), adjusting the posture of the adjusting seat (2) left and right, so that the auxiliary light (11) emitted by the two-dimensional laser ranging sensor (1) coincides with the axis of the upper electrode or the axis of the lower electrode; Step (3), rotating the rotating arm (3) to drive the two-dimensional laser ranging sensor (1) to the first angle position to be detected; Step (4), at the first detection angle position, the two-dimensional laser ranging sensor (1) emits an auxiliary light ray (11) along the electrode axis to project the side surface of the electrode, and simultaneously measures the profile of the electrode side surface corresponding to the auxiliary light ray (11); The distance direction from the two-dimensional laser ranging sensor (1) to the electrode is the X direction, and the electrode axis direction is the Z direction; the display screen (41) of the portable detector (4) displays the side surface of the electrode corresponding to the auxiliary light (11) in real time. contour curve, and automatically calculate the relative axis inclination angle θ of the upper and lower electrodes at the current detection angle position and the end offset Δ of the upper and lower electrodes; Step (5), manually adjust the angle position of the rotating arm (3), so that the two-dimensional laser ranging sensor (1) rotates to the second detection angle position along the electrode axis, and the angle value is obtained by the rotary encoder (5) at the same time; repeat the steps (4), measure the profile curve at the second detection angle position and calculate the relative axis inclination and the offset of the electrode end; Step (6), repeat step (5) until the detection of all required angular positions is completed.

Images