KR20160036417A - Apparatus for detecting omission of welding spotting - Google Patents

Apparatus for detecting omission of welding spotting Download PDF

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Publication number
KR20160036417A
KR20160036417A KR1020140128669A KR20140128669A KR20160036417A KR 20160036417 A KR20160036417 A KR 20160036417A KR 1020140128669 A KR1020140128669 A KR 1020140128669A KR 20140128669 A KR20140128669 A KR 20140128669A KR 20160036417 A KR20160036417 A KR 20160036417A
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KR
South Korea
Prior art keywords
brightness
welding
spot
spot welding
detecting
Prior art date
Application number
KR1020140128669A
Other languages
Korean (ko)
Inventor
양진석
Original Assignee
주식회사 호원
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 주식회사 호원 filed Critical 주식회사 호원
Priority to KR1020140128669A priority Critical patent/KR20160036417A/en
Publication of KR20160036417A publication Critical patent/KR20160036417A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/24—Electric supply or control circuits therefor
    • B23K11/25—Monitoring devices

Abstract

The present invention relates to an apparatus to detect omission of a welding spot and, more specifically, relates to a simple and rapid detection by identifying the omission of the welding spot by a brightness level by detecting the brightness of the welded spot on a component of a vehicle body before a subsequent process, where the spot welded part shows changes in color resulting in a reduced amount of light reflected in the same area. According to the present invention, the apparatus to detect omission of the welding spot in a steel component of the vehicle welded to have at least one spot welding point thereon comprises: an insertion detecting unit to detect whether the component of the vehicle is inserted after spot welding in a preceding spot welding process; a brightness detecting unit to detect the brightness of the vehicle component surface upon detecting the insertion by the insertion detecting unit, to output a normal signal when the detected value of brightness is within a predefined range of a normal value, and to output an error signal when the detected value of brightness is within a predefined range of the error value; and a control unit to control to continuously proceed the process upon receiving the normal signal from the brightness detecting unit, and to stop the process upon receiving the error signal from the same.

Description

[0001] APPARATUS FOR DETECTING OMISSION OF WELDING SPOTING [0002]

[0001] The present invention relates to a spot welding omission detecting apparatus, and more particularly, to a spot welding apparatus for detecting a spot welding defect in a body part before a subsequent process by focusing on the fact that spot welding of a vehicle body part is discolored, And detecting a missing part of the spot by detecting the brightness of the spot, and confirming the welding omission easily and quickly.

Generally, a vehicle body of a vehicle is divided into an underbody holding a lower body skeleton of a vehicle, left and right side bodies constituting a side skeleton of the under body, and a roof panel constituting an upper skeleton of the body, And the panels thus divided are welded together to form a single body.

The above-mentioned body panels are formed by welding a plurality of body parts, mainly by using electric resistance welding. Electric resistance welding is a method of generating heat by using contact resistance and resistivity generated when two base metals to be bonded are brought into contact with each other and then current is passed through. Recently, Spot welding is widely used by resistance welding.

It is very important to check the absence of spot welding and to manage the body assembly process so that the spot welding is not missed because the quality of the vehicle body is greatly affected if the spot welding is missed in the assembly of the vehicle body.

In order to control the quality of spot welding, as in Korean Patent Laid-Open No. 10-2010-0102935 (apparatus for preventing the spotting of welding spots), conventionally, the normal and lower limit ranges of the short- The welding noise is generated when the welding current is out of the specified range of the welding current, and the welder is stopped and the worker visually confirms whether or not the workpiece is welded in the stopped state.

As described above, the visual inspection using the welding tester has an advantage in that it can confirm the welding defect by detecting the current intensity. However, if the welding process is omitted due to the omission of the welding process itself, Still have.

On the other hand, as in Korean Patent Laid-Open No. 10-2001-0068067 (system for preventing spot welding and spot missing) and Korean Utility Model Registration No. 20-1995-0032444 There is a method of sensing a welded portion by detecting an ultrasonic sensor to detect a welded portion. However, the above-described technique is a method of detecting a portion of a structure such as a nut that protrudes or protrudes by welding, It is difficult to apply the method of the present invention.

Korean Patent Laid-Open No. 10-2010-0102935: Device for preventing welding spot missing Korean Patent Laid-Open No. 10-2001-0068067: Nut and spotting prevention system Korean Utility Model Registration Open No. 20-1995-0032444: Automatic Missing Inspection Apparatus

The present invention has been made in recognition of the above points, and it is an object of the present invention to provide a method of manufacturing a vehicle body part, which is capable of reducing the amount of light reflected from the part of the body part, The present invention is to provide a spot welding omission detecting device which can detect the welding omission easily and quickly by detecting the brightness of the spot where the spot welding is performed and confirming the welding omission by the brightness.

In order to accomplish the above object, there is provided a spot welding omission detecting apparatus according to the present invention, wherein a spot weld defect is detected in a body part of a steel material welded to have at least one spot welding spot on its surface, A detection unit for detecting whether or not a body part to be inserted by spot welding in a previous spot welding process is inserted; and a controller for detecting brightness of the surface of the body part when the body part is detected by the input detection part A brightness detector for outputting a normal signal when the detected brightness value is within a preset normal range value and outputting an abnormal signal when the detected value is within a preset abnormal range value; Controls the process to proceed continuously when a signal is transmitted, And a control unit for controlling so that the process of transmitting an abnormal signal from the running out is stopped.

In addition, the spot welding missing apparatus according to the present invention may further include an alarm unit which is controlled to generate a light emission or a warning sound by the control unit when an abnormal signal is transmitted from the brightness detection unit.

Further, in the spot welding dropout detecting apparatus according to the present invention, the brightness detecting unit may include a color sensor.

With the above-described structure, the spot welding omission detecting apparatus according to the present invention has a problem in that spot welding of the body part is discolored and the amount of light reflected from the part is reduced, It is possible to confirm the welding omission easily and quickly by checking the brightness of the portion where the welding is performed and confirming the welding omission by the brightness.

1 is a block diagram schematically showing a spot welding dropout detecting apparatus according to an embodiment of the present invention.
2 is a view conceptually showing an operation of detecting a brightness of a welding part of a brightness sensing part in a spot welding omission detecting device according to an embodiment of the present invention

Hereinafter, a spot welding dropout detecting apparatus according to the present invention will be described in detail with reference to the embodiments shown in the drawings.

FIG. 1 is a conceptual diagram illustrating a spot welding omission sensing apparatus according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a brightness of a welding portion of a brightness sensing unit in a spot welding omission sensing apparatus according to an exemplary embodiment of the present invention. Fig. 2 is a conceptual diagram showing an operation for sensing the operation.

The spot welding omission detecting apparatus according to the present invention detects whether or not the spot welding is missed before the subsequent welding process is performed on the steel body body part P of steel which is welded to have at least one spot welding point S on the surface Referring to the drawings, a spot welding omission detecting apparatus according to an embodiment of the present invention includes an input sensing unit 10, a brightness sensing unit 20, a control unit 30, and an alarm unit 40 .

The input sensing part 10 is mounted on a jig J which is spot-welded in a previous spot welding process in a process of detecting the absence of welding in a series of body welding processes, It is a configuration for detecting whether or not it is inserted. In general, the input sensing unit 10 is constructed in such a manner that a limit switch or a proximity sensor is attached to the jig J, and the body part P is inserted by the input sensing unit 10, The control unit 30 receives the signal and controls the brightness sensing unit 20 to detect the brightness of the welding part of the body part P. [

The brightness detecting unit 20 detects the input of the body part P by the input sensing unit 10 and receives the operation signal of the control unit 30 to receive the surface of the body part P, Detects the brightness of the welding spot S where spot welding is performed, and detects whether or not the spot is missing. The brightness detector 20 outputs a normal signal (OK signal) to the controller 30 when the detected brightness value is within a preset normal range value, and when the detected value is within a preset abnormal range value And outputs an abnormal signal (NG signal) to the control unit 30. [ For example, since the welding spot S welded under the spot welding condition for welding a normal body part is discolored dark, the brightness detection value to be detected is detected to have a value within the range of 1600 to 1800 Lux set to the normal range value , And when the welding is not performed, the detected portion is detected as having a value of 3000 Lux or more, which is set to an abnormal range value because the portion is bright. It is preferable that the brightness detecting unit 20 be easily controlled and use a color sensor because the reliability of brightness detection is excellent even in a harsh environment such as a body assembly process.

The control unit 30 receives the signal when the vehicle body part P is sensed as being input from the input sensing unit 10 and receives the signal so that the brightness sensing unit 20 detects the brightness of the welding spot S And controls the operation of the brightness detection unit 20 to detect the brightness. When a normal signal (OK signal) is transmitted from the brightness detecting unit 20, the control unit controls the entire or part of the body assembling process to proceed continuously, Thereby controlling the entire or part of the assembling process to be interrupted.

The alarm unit 40 is configured to notify the operator that measures are taken when welding is missed. That is, the alarm unit 40 receives a signal from the controller 30 when an abnormal signal (NG signal) is transmitted from the brightness detector 20, and generates a light or a warning sound.

The spot welding dropout detection device described above and shown in the drawings is only one embodiment for carrying out the present invention and should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is defined only by the matters set forth in the following claims, and the embodiments improved and changed without departing from the gist of the present invention are obvious to those having ordinary skill in the art to which the present invention belongs It will be understood that the invention is not limited thereto.

Jig type
B Body panel (body)
P body parts
S welding spot
10 Input detection unit
20 Brightness sensing unit
30 control unit
40 Alarm section

Claims (3)

A spot welding omission detection device for detecting whether or not spot welding is missed in a body part of a steel material welded to a surface so as to have at least one spot welding point,
An input sensing unit for sensing whether a body part to be inserted by spot welding in a previous spot welding process is input,
And detecting a brightness of a surface of the vehicle body component when the input sensing unit senses that the vehicle body component is inserted, outputting a normal signal when the detected brightness value is within a preset normal range value, A brightness detector for outputting an anomaly signal when the value is within a set abnormal range value,
Wherein the control unit controls the process to proceed continuously when the normal signal is transmitted from the brightness detection unit and controls the process of transmitting the abnormal signal from the brightness detection unit to be stopped. The method according to claim 1,
And an alarm unit controlled to generate a light or a warning sound by the control unit when an abnormal signal is transmitted from the brightness detection unit. 3. The method according to claim 1 or 2,
Wherein the brightness detection unit comprises a color sensor.
KR1020140128669A 2014-09-25 2014-09-25 Apparatus for detecting omission of welding spotting KR20160036417A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020140128669A KR20160036417A (en) 2014-09-25 2014-09-25 Apparatus for detecting omission of welding spotting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020140128669A KR20160036417A (en) 2014-09-25 2014-09-25 Apparatus for detecting omission of welding spotting

Publications (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113959960A (en) * 2021-10-27 2022-01-21 青岛华翔汽车金属部件有限公司 Online detection method for automobile outer threshold reinforcement

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113959960A (en) * 2021-10-27 2022-01-21 青岛华翔汽车金属部件有限公司 Online detection method for automobile outer threshold reinforcement

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