CN104677990A - Nondestructive testing device and method for automatic testing of sheet spot welding quality - Google Patents

Nondestructive testing device and method for automatic testing of sheet spot welding quality Download PDF

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Publication number
CN104677990A
CN104677990A CN201510099819.2A CN201510099819A CN104677990A CN 104677990 A CN104677990 A CN 104677990A CN 201510099819 A CN201510099819 A CN 201510099819A CN 104677990 A CN104677990 A CN 104677990A
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probe
mouth
solenoid valve
cover
water pump
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CN201510099819.2A
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Chinese (zh)
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CN104677990B (en
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华林
王彬
汪小凯
刘亚丽
宋雨珂
梁思成
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武汉理工大学
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Abstract

The invention discloses a nondestructive testing device for automatic testing of sheet spot welding quality. The nondestructive testing device comprises a control circuit, a coupling agent injection mechanism, at least one test probe mechanism and a quality assessment mechanism, wherein a coupling agent supply mechanism comprises a water tank, a water pump and an electromagnetic valve; the control circuit controls the water pump and the electromagnetic valve to be started and shut down, a port P of the electromagnetic valve is connected with the water pump, and the water pump is connected with the water tank which is connected with a port T of the electromagnetic valve; each test probe mechanism comprises a high-frequency ultrasonic probe and a probe cover, the probe cover is provided with a liquid inlet hole and a liquid outlet hole, the liquid inlet hole is connected with a port A of the electromagnetic valve, and the liquid outlet hole is connected with a port B of the electromagnetic valve; the quality assessment mechanism comprises an ultrasonic testing device and a computer, the ultrasonic testing device is connected with the high-frequency ultrasonic probe, and the computer is connected with the ultrasonic testing device. According to the nondestructive testing device, automatic online detection of the spot welding quality of large sheets can be realized.

Description

The cannot-harm-detection device of a kind of automatic detection thin plate point quality and method

Technical field

The invention belongs to ultrasound wave lift-off technology field, be specifically related to a kind of lossless detection method and device of automatic detection thin plate point quality, it utilizes ultrasound wave local immersion method to detect, and is applicable to the online automatic detection of car load factory large-scale vehicle body Sheet resistance spot welding Joining Technology.

Background technology

In the manufacture process of body of a motor car, welding is main Joining Technology method, especially resistance spot welding.Solder joint number on a finished automotive vehicle body nearly several thousand, the quality of these solder joints directly affects body quality and vehicle performance, ensure that the quality of spot welding is one of main method improving vehicle safety performance, therefore the quality testing of resistance spot welding is significant.

Along with the fast development of point quality on-line monitoring and postwelding lossless detection method, at present, the equipment that can realize online automatic detection quality of welding spot is urgently found by car load factory, to guarantee the qualification of every platform product quality of welding spot.Utilize the parameter directly affecting quality of welding spot in monitoring pinpoint welding procedure, and the parameter feedback recorded is called point quality on-line real time monitoring to control system to the method controlling its welding quality, online automatic detection must cost low, efficiency is high, easy and simple to handle, strong adaptability, accuracy of detection are high, reliability is strong, the equipment not condition such as cracky.But due to complicacy and the uncertainty of resistance spot welding process, in production run, the Real-Time Monitoring of point quality is more difficult, and postwelding Non-Destructive Testing is as popular research topic in recent years, it realizes comparatively easy, but due to the uniqueness of its operating environment, is also more difficultly applied to on-line checkingi.How postwelding Non-Destructive Testing principle is applied in online automatic detection, produces point quality on-line automatic monitoring system, and the condition meeting online automatic detection is the key that the present invention will study.

Summary of the invention

The object of the present invention is to provide a kind of lossless detection method and device of automatic detection thin plate point quality, it utilizes ultrasound wave local immersion method to realize the online automatic detection of large-scale thin plate point quality, has that cost is low, efficiency is high, easy and simple to handle, strong adaptability, accuracy of detection are high, reliability is strong, an equipment not advantage such as cracky.

The technical solution adopted for the present invention to solve the technical problems is:

There is provided the cannot-harm-detection device of a kind of automatic detection thin plate point quality, this device comprises: control circuit, couplant injecting mechanism, at least one detection probe mechanism and quality evaluation mechanism;

Described couplant organization of supply comprises tank, water pump and solenoid valve, described control circuit is performed by Control water pump and solenoid valve and opens and closes action, described solenoid valve comprises A, B, P, T tetra-mouths, the P mouth of described solenoid valve is connected with water pump by pipeline, described water pump is connected with tank by pipeline, the T mouth of described solenoid valve is connected with tank by pipeline, splendid attire couplant in described tank;

Described detection probe mechanism comprises high frequency ultrasound probe and probe outer cover, described high frequency ultrasound probe is provided with delay block, described high frequency ultrasound probe is arranged in probe outer cover, described probe outer cover is provided with inlet opening and fluid hole, described inlet opening is connected with the A mouth of solenoid valve by pipeline, and described fluid hole is connected with the B mouth of solenoid valve by pipeline;

Described quality evaluation mechanism comprises supersonic reflectoscope and computing machine, and described supersonic reflectoscope is connected with high frequency ultrasound probe, and described computing machine is connected with supersonic reflectoscope.

By technique scheme, described control circuit comprises PLC, three self-resetting switch and two relays, and the input end of described PLC is connected with three self-resetting switch respectively, and the output terminal of described PLC is connected with two relays respectively.

By technique scheme, the wafer diameter of described high frequency ultrasound probe equals the minimum dot weld nugget diameter of thin plate to be measured.

By technique scheme, described probe outer cover is made up of transparent organic plastics.

By technique scheme, between described probe outer cover and thin plate to be measured, rubber ring is installed.

By technique scheme, the inlet opening of described probe outer cover and fluid hole are the cylindrical hole of outwardly convex.

By technique scheme, described pipeline is rubber tube.

Accordingly, the present invention also provides a kind of lossless detection method of automatic detection thin plate point quality, comprises the following steps:

S1, device according to claim 1 and solder joint to be measured carried out mating and locates, probe outer cover is placed on solder joint place to be measured, apply will pop one's head in outer cover and thin plate to be measured of pressure at right angle to compress, and ensure that the wafer plane of high frequency ultrasound probe is parallel with the plate face of thin plate to be measured;

S2, control circuit perform breakdown action by Control water pump and solenoid valve, make couplant be full of all pipelines and probe outer cover, with the air in discharge line by solenoid valve under the effect of water pump;

The ultrasonic signal detected is sent to supersonic reflectoscope by S3, high frequency ultrasound probe, supersonic reflectoscope converts these ultrasonic signals to ultrasonic reflection waveform figure, and this ultrasonic reflection waveform figure is sent to computing machine, computing machine obtains the required parameter such as nugget thickness, depth of cup, ultrasonic attenuation coefficient, nugget size after treatment, reevaluates these parameters and show that quality of welding spot is reported;

S4, carry out next solder joint when detecting, repeat step S1, control circuit performs breakdown action by Control water pump and solenoid valve, makes couplant be full of probe outer cover, then repeats step S3;

S5, repetition step S4, until complete the quality testing of residue solder joint.

By technique scheme, described step S2 is specially: control circuit first performs breakdown action by Control water pump, and now the P mouth of solenoid valve is connected with T mouth, and couplant enters P mouth by tank through water pump and flows back in tank through T mouth again; Control circuit performs breakdown action by Control solenoid valve again, now the P mouth of solenoid valve and A mouth are connected, T mouth and B mouth are connected, couplant is first flowed into by inlet opening in probe outer cover through P mouth and A mouth again, then flow back in tank through B mouth and T mouth again by fluid hole, until couplant is full of all pipelines and probe outer cover, after being discharged completely by the air in pipeline.

The beneficial effect that the present invention produces is: 1, the couplant pipeline of this device forms closed circuit, ensures couplant reusable edible, can not pollute measured workpiece and working environment, reduce costs; 2, this device adopts at least one detection probe mechanism, and can detect the quality of multiple solder joint as required, efficiency is high, and reaction velocity is fast simultaneously; 3, this device realizes full process automatization detection by control circuit, easy and simple to handle; 4, couplant is liquid, and solder joint directly contacts with couplant, and in probe outer cover, clearances all between wafer and solder joint can be coupled agent and fills, and can detect that impression is irregular, jagged, the solder joint of plate face injustice, strong adaptability; 5, the ultrasound examination of local immersion method avoids the interference of machinery and human factor, and ripe ultrasonic detection technology makes that its accuracy of detection is high, reliability is strong; 6, consumable accessory-ultrasonic probe wafer has delay block to protect, not cracky.The present invention can meet all requirements of large-scale automotive bobdy sheet metal point quality online automatic detection.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:

Fig. 1 is the structural representation of the embodiment of the present invention;

Fig. 2 is the structural scheme of mechanism of control circuit.

In figure: 1-solenoid valve, 2-pipeline, 3-water pump, 4-tank, 5-supersonic reflectoscope, 6-computing machine, 7-high frequency ultrasound probe, 8-delay block, 9-pop one's head in outer cover, 901-inlet opening, 902-fluid hole, 10-thin plate to be measured, 11-three-way connection, 12-solder joint to be measured.

Embodiment

In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.

As shown in Figure 1, the cannot-harm-detection device of a kind of automatic detection thin plate point quality, this device comprises: control circuit, couplant injecting mechanism, at least one detection probe mechanism and quality evaluation mechanism;

Couplant organization of supply comprises tank 4, water pump 3 and solenoid valve 1, control circuit is performed by Control water pump 3 and solenoid valve 1 and opens and closes action, solenoid valve 1 comprises A, B, P, T tetra-mouths, the P mouth of solenoid valve 1 is connected with water pump 3 by pipeline, water pump 3 is connected with tank 4 by pipeline, the T mouth of solenoid valve 1 is connected with tank 4 by pipeline, splendid attire couplant in tank 4;

Detection probe mechanism comprises high frequency ultrasound probe 7 and probe outer cover 9, high frequency ultrasound probe 7 is provided with delay block 8, high frequency ultrasound probe 7 is arranged in probe outer cover 9, probe outer cover 9 is provided with inlet opening 901 and fluid hole 902, inlet opening 901 is connected with the A mouth of solenoid valve 1 by pipeline, and fluid hole 901 is connected with the B mouth of solenoid valve 1 by pipeline;

Quality evaluation mechanism comprises supersonic reflectoscope 5 and computing machine 6, and supersonic reflectoscope 5 is connected with high frequency ultrasound probe 7, and computing machine 6 is connected with supersonic reflectoscope 5.

In a preferred embodiment of the invention, as shown in Figure 2, control circuit comprises PLC, three self-resetting switch (K1, K2, K3) and two relays (KA1, KA2), the input end of PLC is connected with three self-resetting switch respectively, and the output terminal of PLC is connected with two relays respectively.

In a preferred embodiment of the invention, the wafer diameter of high frequency ultrasound probe equals the minimum dot weld nugget diameter of thin plate to be measured.

In a preferred embodiment of the invention, probe outer cover is made up of transparent organic plastics, is convenient to observe this device and pad localization situation, does precision adjustment, and organic plastics not cracky.

In a preferred embodiment of the invention, be provided with rubber ring between probe outer cover 9 and thin plate to be measured 10, concrete, this rubber ring sticks to probe outer cover bottom, thinner, plays a part to seal couplant, can also strengthen the adaptability of this device to out-of-flatness plane.

In a preferred embodiment of the invention, as shown in Figure 1, the inlet opening 901 of probe outer cover 9 and fluid hole 902 are the cylindrical hole of outwardly convex, are convenient to the access of rubber water pipe, are also beneficial to the clamping of mechanical arm.

In a preferred embodiment of the invention, as shown in Figure 1, pipeline 2 is rubber tube.

Accordingly, as shown in Figure 1, the present invention also provides a kind of lossless detection method of automatic detection thin plate point quality, comprises the following steps:

S1, above-mentioned device carried out mating with solder joint 12 to be measured and locates, probe outer cover 9 is placed on solder joint 12 place to be measured, apply pressure at right angle probe outer cover 9 and thin plate 10 to be measured are compressed, and ensure that the wafer plane of high frequency ultrasound probe 7 is parallel with the plate face of thin plate 10 to be measured;

S2, control circuit perform breakdown action by Control water pump 3 and solenoid valve 1, make couplant be full of all pipelines 2 and probe outer cover 9, with the air in discharge line by solenoid valve 1 under the effect of water pump 3;

The ultrasonic signal detected is sent to supersonic reflectoscope 5 by S3, high frequency ultrasound probe 7, supersonic reflectoscope 5 converts these ultrasonic signals to ultrasonic reflection waveform figure, and this ultrasonic reflection waveform figure is sent to computing machine 6, computing machine 6 obtains the required parameter such as nugget thickness, depth of cup, ultrasonic attenuation coefficient, nugget size after treatment, reevaluates these parameters and show that quality of welding spot is reported;

S4, carry out next solder joint detect time, repeat step S1, control circuit performs breakdown action by Control water pump 3 and solenoid valve 1, make couplant be full of probe outer cover 9, then repeat step S3;

S5, repetition step S4, until complete the quality testing of residue solder joint.

In a preferred embodiment of the invention, as shown in Figure 1, step S2 is specially: control circuit first performs breakdown action by Control water pump, and now the P mouth of solenoid valve is connected with T mouth, and couplant enters P mouth by tank through water pump and flows back in tank through T mouth again; Control circuit performs breakdown action by Control solenoid valve again, now the P mouth of solenoid valve and A mouth are connected, T mouth and B mouth are connected, couplant is first flowed into by inlet opening in probe outer cover through P mouth and A mouth again, then flow back in tank through B mouth and T mouth again by fluid hole, until couplant is full of all pipelines and probe outer cover, after being discharged completely by the air in pipeline.

As shown in Figure 1 and Figure 2, the present invention is when embody rule, such as quality testing is carried out to the spot welding of 1mm+1mm dual phase sheet steel DP590, the device adopted includes solenoid valve 1, rubber tubing, micro pump, tank 4, supersonic reflectoscope 5, computing machine 6, high frequency ultrasound probe 7, the delay block 8 of wafer diameter 4mm, pop one's head in outer cover 9 and three-way connection 11, installs this device by the annexation of Fig. 1;

During original state, couplant-antirust solution is filled with in tank 4, open supersonic reflectoscope 5, computing machine 6, the detection probe mechanism that high frequency ultrasound probe 7, delay block 8, probe outer cover 9 form is in running order, manipulator clamping probe outer cover is utilized to navigate on solder joint 12, applying pressure at right angle compresses, the wafer plane of high frequency ultrasound probe 7 and plate face keeping parallelism;

Open PLC, K1, K2, K3 is three self-resetting switch, get an electric shock in non-action position and disconnect, press K switch 1, PLC input current I0.0 powers on, trigger output circuit Q0.0 powers on, engage relay KA1, micro pump is started working, antirust solution is by the P of tank 4 through rubber tubing and solenoid valve 1, T mouth flows back in tank, form closed circuit, press K switch 2, input circuit I0.1 powers on, trigger output circuit Q0.1 powers on, engage relay KA2, PLC Controlling solenoid valve YV is energized after 10s, disconnect electromagnetic valve circuit, during commutation connected by solenoid valve, P, A mouth is connected, B, mouth T connects, antirust solution flows in probe outer cover 9 through rubber tubing, play coupling, unnecessary antirust solution is through solenoid valve B, T mouth flows back in tank 4, also form closed circuit, be convenient to couplant recycling, this stage is water route initial phase, object allows coupling liquid flow through whole rubber tubing and probe outer cover, with the air in purging line, continue to press K switch 3, input circuit I0.1 powers on, trigger output circuit Q0.1 powers on, engage relay KA2, PLC Controlling solenoid valve YV is energized after 1s, couplant is full of probe outer cover 9, disconnect electromagnetic valve circuit,

Detection probe mechanism starts working, supersonic reflectoscope 5 there is the ultrasonic reflection waveform of solder joint, remove detection probe mechanism, this oscillogram is real-time transmitted in computing machine 6 by network interface with the form of picture, utilize the software processing graphics write, obtain desired parameters, these parameters of further evaluation, obtain the evaluation indexes such as nugget thickness, depth of cup, ultrasonic attenuation coefficient, nugget size, finally assess these evaluation indexes, provided the quality testing situation of this solder joint by computing machine, and be saved in software;

Locate next solder joint, press K switch 3, there is oscillogram in supersonic reflectoscope, import in computing machine and process, evaluate quality of welding spot, so repeatedly, until detected all solder joints, press K switch 1, close micro pump, three-way connection 11 can be shunted the couplant in rubber tubing, make antirust solution be full of two probe outer covers simultaneously, complete the quality testing of two solder joints simultaneously, also can change three-way connection into multiple-pass joint, realize the synchronous online quality control of multiple solder joint, greatly improve detection efficiency.

The beneficial effect that the present invention produces is: 1, the couplant pipeline of this device forms closed circuit, ensures couplant reusable edible, can not pollute measured workpiece and working environment, reduce costs; 2, this device adopts at least one detection probe mechanism, and can detect the quality of multiple solder joint as required, efficiency is high, and reaction velocity is fast simultaneously; 3, this device realizes full process automatization detection by control circuit, easy and simple to handle; 4, couplant is liquid, and solder joint directly contacts with couplant, and in probe outer cover, clearances all between wafer and solder joint can be coupled agent and fills, and can detect that impression is irregular, jagged, the solder joint of plate face injustice, strong adaptability; 5, the ultrasound examination of local immersion method avoids the interference of machinery and human factor, and ripe ultrasonic detection technology makes that its accuracy of detection is high, reliability is strong; 6, consumable accessory-ultrasonic probe wafer has delay block to protect, not cracky.The present invention can meet all requirements of large-scale automotive bobdy sheet metal point quality online automatic detection.

Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to claims of the present invention.

Claims (9)

1. automatically detect a cannot-harm-detection device for thin plate point quality, it is characterized in that, this device comprises: control circuit, couplant injecting mechanism, at least one detection probe mechanism and quality evaluation mechanism;
Described couplant organization of supply comprises tank, water pump and solenoid valve, described control circuit is performed by Control water pump and solenoid valve and opens and closes action, described solenoid valve comprises A, B, P, T tetra-mouths, the P mouth of described solenoid valve is connected with water pump by pipeline, described water pump is connected with tank by pipeline, the T mouth of described solenoid valve is connected with tank by pipeline, splendid attire couplant in described tank;
Described detection probe mechanism comprises high frequency ultrasound probe and probe outer cover, described high frequency ultrasound probe is provided with delay block, described high frequency ultrasound probe is arranged in probe outer cover, described probe outer cover is provided with inlet opening and fluid hole, described inlet opening is connected with the A mouth of solenoid valve by pipeline, and described fluid hole is connected with the B mouth of solenoid valve by pipeline;
Described quality evaluation mechanism comprises supersonic reflectoscope and computing machine, and described supersonic reflectoscope is connected with high frequency ultrasound probe, and described computing machine is connected with supersonic reflectoscope.
2. device according to claim 1, it is characterized in that, described control circuit comprises PLC, three self-resetting switch and two relays, and the input end of described PLC is connected with three self-resetting switch respectively, and the output terminal of described PLC is connected with two relays respectively.
3. device according to claim 1, is characterized in that, the wafer diameter of described high frequency ultrasound probe equals the minimum dot weld nugget diameter of thin plate to be measured.
4. device according to claim 1, is characterized in that, described probe outer cover is made up of transparent organic plastics.
5. device according to claim 1, is characterized in that, is provided with rubber ring between described probe outer cover and thin plate to be measured.
6. device according to claim 1, is characterized in that, the inlet opening of described probe outer cover and fluid hole are the cylindrical hole of outwardly convex.
7. device according to claim 1, is characterized in that, described pipeline is rubber tube.
8. automatically detect a lossless detection method for thin plate point quality, comprise the following steps:
S1, device according to claim 1 and solder joint to be measured carried out mating and locates, probe outer cover is placed on solder joint place to be measured, apply will pop one's head in outer cover and thin plate to be measured of pressure at right angle to compress, and ensure that the wafer plane of high frequency ultrasound probe is parallel with the plate face of thin plate to be measured;
S2, control circuit perform breakdown action by Control water pump and solenoid valve, make couplant be full of all pipelines and probe outer cover, with the air in discharge line by solenoid valve under the effect of water pump;
The ultrasonic signal detected is sent to supersonic reflectoscope by S3, high frequency ultrasound probe, supersonic reflectoscope converts these ultrasonic signals to ultrasonic reflection waveform figure, and this ultrasonic reflection waveform figure is sent to computing machine, computing machine obtains the required parameter such as nugget thickness, depth of cup, ultrasonic attenuation coefficient, nugget size after treatment, reevaluates these parameters and show that quality of welding spot is reported;
S4, carry out next solder joint when detecting, repeat step S1, control circuit performs breakdown action by Control water pump and solenoid valve, makes couplant be full of probe outer cover, then repeats step S3;
S5, repetition step S4, until complete the quality testing of residue solder joint.
9. method according to claim 8, it is characterized in that, described step S2 is specially: control circuit first performs breakdown action by Control water pump, and now the P mouth of solenoid valve is connected with T mouth, and couplant enters P mouth by tank through water pump and flows back in tank through T mouth again; Control circuit performs breakdown action by Control solenoid valve again, now the P mouth of solenoid valve and A mouth are connected, T mouth and B mouth are connected, couplant is first flowed into by inlet opening in probe outer cover through P mouth and A mouth again, then flow back in tank through B mouth and T mouth again by fluid hole, until couplant is full of all pipelines and probe outer cover, after being discharged completely by the air in pipeline.
CN201510099819.2A 2015-03-06 2015-03-06 A kind of the cannot-harm-detection device and method of automatic detection thin plate point quality CN104677990B (en)

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CN105181802A (en) * 2015-10-09 2015-12-23 湖南湖大艾盛汽车技术开发有限公司 Portable ultrasonic welding spot inspection equipment provided with one host and multiple slaves
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CN106643591A (en) * 2016-12-12 2017-05-10 大连理工大学 Probe adaptively adjusted thin-wall part on-machine ultrasonic thickness measuring method
CN107525481A (en) * 2017-08-18 2017-12-29 中国航发贵州黎阳航空动力有限公司 A kind of plug welding point ultrasonic detection device and method
CN107727739A (en) * 2017-10-12 2018-02-23 吉林大学 Point quality fully-automatic supersonic non-destructive detecting device and method
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CN105181802A (en) * 2015-10-09 2015-12-23 湖南湖大艾盛汽车技术开发有限公司 Portable ultrasonic welding spot inspection equipment provided with one host and multiple slaves
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CN106643591A (en) * 2016-12-12 2017-05-10 大连理工大学 Probe adaptively adjusted thin-wall part on-machine ultrasonic thickness measuring method
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CN107525481A (en) * 2017-08-18 2017-12-29 中国航发贵州黎阳航空动力有限公司 A kind of plug welding point ultrasonic detection device and method
CN107525481B (en) * 2017-08-18 2020-03-13 中国航发贵州黎阳航空动力有限公司 Ultrasonic detection device and method for plug welding point
CN107727739A (en) * 2017-10-12 2018-02-23 吉林大学 Point quality fully-automatic supersonic non-destructive detecting device and method
CN107967004A (en) * 2017-11-27 2018-04-27 四川共享铸造有限公司 A kind of UT probes of energy stability contorting dynamics

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