CN114295546A - Device and method for detecting bonding strength between molded shaft sleeve end face gasket and substrate - Google Patents
Device and method for detecting bonding strength between molded shaft sleeve end face gasket and substrate Download PDFInfo
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- CN114295546A CN114295546A CN202210127009.3A CN202210127009A CN114295546A CN 114295546 A CN114295546 A CN 114295546A CN 202210127009 A CN202210127009 A CN 202210127009A CN 114295546 A CN114295546 A CN 114295546A
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000000758 substrate Substances 0.000 title claims description 14
- 238000006073 displacement reaction Methods 0.000 claims abstract description 31
- 238000005520 cutting process Methods 0.000 claims abstract description 25
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 238000005070 sampling Methods 0.000 claims description 6
- 238000003384 imaging method Methods 0.000 claims description 3
- 230000005389 magnetism Effects 0.000 claims 1
- 238000000465 moulding Methods 0.000 abstract description 8
- 239000000463 material Substances 0.000 description 4
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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Abstract
The invention discloses a device and a method for detecting the bonding strength of an end face gasket and a base body of a molding type shaft sleeve, wherein the device comprises a workbench, and a portal frame and a precision vice are fixed on the table surface of the workbench; the shaft sleeve is fixed on the precision vice, and the end face of the liner on the end face of the shaft sleeve is arranged upwards; the upper part of the portal frame is provided with a linear motor module which is horizontally and transversely arranged; a dynamometer clamp is fixed on the working flat plate, a dynamometer is fixed on the dynamometer clamp, a vertical feeding module is fixed on the dynamometer, and a semicircular push cutting block driven by the vertical feeding module to do lifting motion is fixedly connected to the bottom of the vertical feeding module; and a linear displacement sensor is fixed on the linear motor module, and a detection screw rod of the linear displacement sensor is connected to the dynamometer clamp. The invention has simple structure and high detection precision, can meet the requirement of the instant detection of the bonding strength of the molded liner on the end surface of the finished shaft sleeve, and can effectively and accurately evaluate the bonding strength performance of the molded self-lubricating shaft sleeve liner.
Description
Technical Field
The invention relates to the technical field of gasket bonding strength detection, in particular to a device and a method for detecting the bonding strength of a molded shaft sleeve end surface gasket and a base body.
Background
The self-lubricating shaft sleeve has wide application scenes. Self-lubricating liner materials for self-lubricating sleeves often use solid self-lubricating materials, which are mainly classified into fabric types and molding types. The liner is an important component for realizing the self-lubricating function of the shaft sleeve.
The bonding strength of the gasket is an important index for evaluating the performance of the self-lubricating shaft sleeve, the lubricating performance and the service life of the shaft sleeve are influenced, the lubricating performance of the shaft sleeve is reduced and even fails due to the fact that the gasket is separated caused by insufficient bonding strength of the gasket, and abnormal abrasion and even failure of the shaft sleeve and a matching piece of the shaft sleeve are caused.
The method of testing the bond strength of the fabric-type self-lubricating liner to the substrate is generally referred to the american society of automotive engineers air standard SAE-AS-81820D-2014, which is tested primarily in a peel-off form.
At present, the method is limited by a peeling detection mode of clamping the liner at two ends, the detection method of the liner peeling strength can only be used for detecting part of specially-made molded liner samples, and the bonding strength of the molded self-lubricating liner and a base body of the end face of the finished shaft sleeve cannot be detected, and the main reasons are as follows:
the preparation process of the molding type gasket mainly comprises the steps of forming a cavity by extrusion forming, and then filling a self-lubricating material to form the molding type gasket, wherein the process method can refer to (ZL 2019104069174).
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a device and a method for detecting the bonding strength between an end face gasket and a base body of a molding type shaft sleeve, which have simple structure and high detection precision.
In order to achieve the purpose, the invention adopts the following technical scheme:
the device for detecting the bonding strength of the end face gasket and the base body of the molding type shaft sleeve comprises a workbench, wherein a portal frame and a precision vice are fixed on the table top of the workbench;
the shaft sleeve is fixed on the precision vice, and the end face of the liner on the end face of the shaft sleeve is arranged upwards;
the upper part of the portal frame is provided with a linear motor module which is horizontally and transversely arranged, the linear motor module is connected with a working flat plate which is driven by the linear motor module to horizontally and transversely move, the linear motor module is connected to a linear motor controller, the linear motor controller is used for controlling the linear movement speed and time of the working flat plate, and the linear movement information of the working flat plate is input into a computer for real-time debugging, analysis and processing;
a dynamometer clamp is fixed on the working flat plate, a dynamometer is fixed on the dynamometer clamp, the dynamometer is connected to a signal collector and a signal amplifier, and collected push-cut force signals are input to a computer for analysis and processing; a vertical feeding module is fixed on the dynamometer, a semicircular push cutting block driven by the vertical feeding module to do lifting motion is fixedly connected to the bottom of the vertical feeding module, and the opening end of the semicircular push cutting block faces to the liner on the end face of the shaft sleeve;
the linear motor module is fixedly provided with a linear displacement sensor, a detection screw of the linear displacement sensor is connected to the dynamometer clamp, and displacement information detected by the linear displacement sensor is displayed and recorded by the displacement sensing display controller and is input into a computer for analysis and processing.
Furthermore, the vertical feed module comprises a vertical feed clamp, a vertical feed push rod is sleeved inside the vertical feed clamp in a sliding mode, the bottom of the vertical feed push rod extends out of the vertical feed clamp and is fixedly provided with a push rod connecting piece, the push rod connecting piece is fixedly connected with the semicircular push cutting block, a casing type differential head is fixed at the upper end of the vertical feed clamp, a micrometer screw of the casing type differential head is inserted into the vertical feed clamp and abuts against the top of the vertical feed push rod, a spring sleeved on the vertical feed push rod is arranged inside the vertical feed clamp, the lower end of the spring abuts against the inner wall of the vertical feed clamp, and the upper end of the spring abuts against a boss on the vertical feed push rod.
Furthermore, the vertical feeding clamp consists of two parts which are symmetrically split left and right, the left part and the right part are locked and fixed through bolts, a cylindrical inner groove is formed in the left part and the right part, and the inner groove is used for accommodating the vertical feeding push rod and the spring.
Furthermore, a plurality of T-shaped grooves are formed in the table board of the workbench, and the portal frame and the precision vice are respectively locked and fixed on the corresponding T-shaped grooves through bolt and nut assemblies.
Further, the radius of the semicircular push-cut block is equal to that of the outer ring of the gasket.
The tool setting and detecting device further comprises a high-definition camera, wherein the high-definition camera is fixedly clamped by a magnetic gauge stand adsorbed on the table top of the workbench and is connected to a computer and used for displaying and recording image information of tool setting and detecting processes in real time.
Furthermore, two clamping end parts of the precision vice are fixed with V-shaped blocks, and the shaft sleeve is fixed between the two V-shaped blocks.
The invention relates to a method for detecting the bonding strength of an end face gasket and a base body of a molding type shaft sleeve, which comprises the following steps:
1) tool setting: detecting the average thickness h of the gasket by using a microscope; in an initial state, the semicircular push cutting block is positioned right above the liner, and the center line of the liner is superposed with the center line of the semicircular push cutting block by adjusting the precision vice; adjusting the vertical feeding clamp to enable the bottom of the semicircular push cutting block to be close to and contact with the upper surface of the gasket, and enabling the semicircular push cutting block to exit from the upper surface of the gasket in the horizontal direction by utilizing the linear motor module; then the semicircular push-cut block vertically moves downwards for 0.85 h-0.98 h under the driving of a vertical feeding module, the thickness g of the semicircular push-cut block is 1.2 h-1.8 h, finally a linear motor module is started to push the semicircular push-cut block to slowly attach to the outer circumferential surface of the gasket, and the tool setting can be completed by means of real-time imaging of a high-definition camera;
2) and (3) detecting the binding strength: starting a linear motor module and a linear displacement sensor, wherein the linear motor module drives a semicircular push-cut block to push a liner, the semicircular push-cut block continuously pushes the liner on the end face of a shaft sleeve to peel off and displace until the liner is completely pushed by the semicircular push-cut block to peel off the upper surface of the shaft sleeve, in the process, the linear displacement sensor detects displacement information of the liner in real time and inputs the displacement information into a computer for analysis and processing, and meanwhile, a dynamometer detects push-cut force signals generated by the push-cut liner in real time and inputs the push-cut force signals into the computer for analysis and processing after passing through a signal collector and a signal amplifier;
3) analysis and treatment:
after the push cutting process is completed, the comprehensive bonding strength sigma of the gasket and the substrate is calculated as follows:
wherein, FiThe signal value of the ith effective sampling push-cut force is detected by the dynamometer when the push-cut force is detected, i is 1,2 and 3 … N, N is the total effective sampling times, D is the diameter of the outer ring of the liner on the end face of the shaft sleeve, and D is the diameter of the inner hole of the shaft sleeve.
The invention has simple structure and high detection precision, can meet the requirement of the instant detection of the bonding strength of the molded liner on the end surface of the finished shaft sleeve, and can effectively and accurately evaluate the bonding strength performance of the molded self-lubricating shaft sleeve liner.
Drawings
The invention is described in further detail below with reference to the accompanying drawings and the detailed description;
FIG. 1 is a schematic view of a detecting device according to the present invention;
FIG. 2 is a schematic view of a vertical feed module;
FIG. 3 is a schematic view of the detection of the binding strength of the present invention;
fig. 4 is a graph of push-to-cut liner force versus push-to-cut displacement.
Detailed Description
Referring to fig. 1-3, the device for detecting the bonding strength between the end face liner and the substrate of the molded shaft sleeve comprises a workbench 1, wherein a portal frame 8 and a precision vice 23 are fixed on the table top of the workbench 1;
the shaft sleeve 25 is fixed on the precision vice 23, and the end face of the liner 24 on the end face of the shaft sleeve 25 is arranged upwards;
the upper part of the portal frame 8 is provided with a linear motor module 9 which is horizontally arranged, the linear motor module 9 is connected with a working flat plate 10 which is driven by the linear motor module to horizontally move, the linear motor module 9 is connected to a linear motor controller, the linear motor controller is used for controlling the linear movement speed and time of the working flat plate 10, and the linear movement information of the working flat plate 10 is input into a computer for real-time debugging, analysis and processing;
a dynamometer clamp 11 is fixed on the working flat plate 10, a dynamometer 12 is fixed on the dynamometer clamp 11, the dynamometer 12 is connected to a signal collector and a signal amplifier, and collected push-cut force signals are input to a computer for analysis and processing; a vertical feeding module is fixed on the dynamometer 12, a semicircular push cutting block 22 driven by the vertical feeding module to move up and down is fixedly connected to the bottom of the vertical feeding module, preferably, the radius of the semicircular push cutting block 22 is equal to the radius of the outer ring of the gasket 24, and the opening end of the semicircular push cutting block 22 faces the gasket 24 on the end face of the shaft sleeve 25;
the linear motor module 9 is fixed with a linear displacement sensor 7, a detection screw 6 of the linear displacement sensor 7 is connected to a dynamometer clamp 11, and displacement information detected by the linear displacement sensor 7 is displayed and recorded by a displacement sensing display controller of the gasket 24 and is input into a computer for analysis and processing.
The vertical feeding module comprises a vertical feeding clamp 14, a vertical feeding push rod 19 is sleeved in the vertical feeding clamp 14 in a sliding mode, the bottom of the vertical feeding push rod 19 extends out of the vertical feeding clamp 14 and is fixed with a push rod connecting piece 21, the push rod connecting piece 21 is fixedly connected with a semicircular push cutting block 22, the upper end of the vertical feeding clamp 14 is fixed with a sleeve type differential head 13, a micrometer screw 27 of the sleeve type differential head 13 is inserted into the vertical feeding clamp 14 and abuts against the top of the vertical feeding push rod 19, a spring 29 sleeved on the vertical feeding push rod 19 is arranged in the vertical feeding clamp 14, the lower end of the spring 29 abuts against the inner wall of the vertical feeding clamp 14, and the upper end of the spring 29 abuts against a boss 28 on the vertical feeding push rod 19. During vertical feeding, the rotating sleeve type differential head 13 drives the micrometer screw 27 at the bottom to move downwards, the boss 28 on the vertical feeding push rod 19 is pushed to compress the spring 29 to feed downwards, and then the connecting piece and the semicircular push cutting block 22 are pushed to feed downwards.
The vertical feed jig 14 is composed of two parts which are symmetrically opened from left to right and are locked by bolts, and a cylindrical inner groove is formed in the inside thereof for accommodating the vertical feed push rod 19 and the spring 29.
A plurality of T-shaped grooves 2 are formed in the table top of the workbench 1, and the portal frame 8 and the precision vice 23 are respectively locked and fixed on the corresponding T-shaped grooves 2 through the bolt and nut assemblies 3.
The tool setting and detecting device also comprises a high-definition camera 5, wherein the high-definition camera 5 is fixedly clamped by a magnetic gauge stand 4 adsorbed on the table top of the workbench 1, and the high-definition camera 5 is connected to a computer and used for displaying and recording image information of tool setting and detecting processes in real time.
Two clamping end parts of the precision vice 23 are respectively fixed with a V-shaped block 26, the shaft sleeve 25 is fixed between the two V-shaped blocks 26, and the V-shaped blocks 26 can realize self-centering clamping of the shaft sleeve 25.
The material hardness of the semicircular push-cut block 22 should have a hardness not greater than the hardness of the pad 24, and is preferably nylon.
The invention relates to a method for detecting the bonding strength of an end face gasket and a base body of a molding type shaft sleeve, which comprises the following steps:
1) before the bonding strength is detected, the tool is required to be set so as to accurately determine the contact area between the semicircular push-cutting block 22 and the gasket 24, and the specific tool setting method is as follows: detecting the average thickness h of the gasket by using a microscope; in the initial state, the semicircular push-cut block 22 is positioned right above the liner 24, and the central line of the liner 24 is superposed with the central line of the semicircular push-cut block 22 by adjusting the precision vice 23; the bottom of the semicircular push-cut block 22 is enabled to be close to and contacted with the upper surface of the gasket 24 by adjusting the vertical feeding clamp 14, and then the semicircular push-cut block 22 is enabled to be withdrawn from the upper surface of the gasket 24 in the horizontal direction by utilizing the linear motor module 9; then the semicircular push-cut block 22 vertically moves downwards for 0.85 h-0.98 h through the driving of the vertical feeding module, the thickness g of the semicircular push-cut block 22 is 1.2 h-1.8 h (preferably, g is 1.3h), finally the linear motor module 9 is started, the semicircular push-cut block 22 is pushed to slowly attach to the outer circumferential surface close to the gasket 24, and the cutter setting can be completed by means of real-time imaging of the high-definition camera 5;
2) and (3) detecting the binding strength: starting a linear motor module 9 and a linear displacement sensor 7, wherein the linear motor module 9 drives a semicircular push-cut block 22 to push a liner 24, the semicircular push-cut block 22 continuously pushes the liner 24 on the end face of a shaft sleeve 25 to peel off and displace until the liner 24 is completely pushed and separated from the upper surface of the shaft sleeve 25 by the semicircular push-cut block 22, in the process, the linear displacement sensor 7 detects displacement information of the liner 24 in real time and inputs the displacement information into a computer for analysis and processing, and meanwhile, a force measuring instrument 12 detects push-cut force signals generated by the push-cut liner 24 in real time and inputs the push-cut force signals into the computer for analysis and processing after passing through a signal collector and a signal amplifier; the relationship between the push-cut force and the displacement curve collected in the detection process is shown in fig. 4;
3) analysis and treatment:
after the push cutting process is completed, the comprehensive bonding strength sigma of the gasket and the substrate is calculated as follows:
wherein, FiThe signal value of the ith effective sampling force is detected by the dynamometer when the push-cut force is detected, i is 1,2 and 3 … N, N is the total effective sampling times, D is the diameter of the outer ring of the liner on the end face of the shaft sleeve, and D is the diameter of the inner hole of the shaft sleeve.
While the invention has been described in connection with the above embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, which are illustrative and not restrictive, and that those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (8)
1. The detection device for the bonding strength between the molded shaft sleeve end face gasket and the base body is characterized in that: the automatic clamping device comprises a workbench, wherein a portal frame and a precision vice are fixed on the table top of the workbench;
the shaft sleeve is fixed on the precision vice, and the end face of the liner on the end face of the shaft sleeve is arranged upwards;
the upper part of the portal frame is provided with a linear motor module which is horizontally and transversely arranged, the linear motor module is connected with a working flat plate which is driven by the linear motor module to horizontally and transversely move, the linear motor module is connected to a linear motor controller, the linear motor controller is used for controlling the linear movement speed and time of the working flat plate, and the linear movement information of the working flat plate is input into a computer for real-time debugging, analysis and processing;
a dynamometer clamp is fixed on the working flat plate, a dynamometer is fixed on the dynamometer clamp, the dynamometer is connected to a signal collector and a signal amplifier, and collected push-cut force signals are input to a computer for analysis and processing; a vertical feeding module is fixed on the dynamometer, a semicircular push cutting block driven by the vertical feeding module to do lifting motion is fixedly connected to the bottom of the vertical feeding module, and the opening end of the semicircular push cutting block faces to the liner on the end face of the shaft sleeve;
the linear motor module is fixedly provided with a linear displacement sensor, a detection screw of the linear displacement sensor is connected to the dynamometer clamp, and displacement information detected by the linear displacement sensor is displayed and recorded by a displacement sensing display controller, is generated by pushing and cutting the gasket and is input into a computer for analysis and processing.
2. The apparatus for testing the bonding strength of a molded bushing end face gasket to a substrate of claim 1, wherein: the vertical feed module comprises a vertical feed clamp, a vertical feed push rod is sleeved in the vertical feed clamp in a sliding mode, the bottom of the vertical feed push rod extends out of the vertical feed clamp and is fixedly provided with a push rod connecting piece, the push rod connecting piece is fixedly connected with a semicircular push cutting block, a casing type differential head is fixed at the upper end of the vertical feed clamp, a micrometer screw of the casing type differential head is inserted into the vertical feed clamp and abuts against the top of the vertical feed push rod, a spring sleeved on the vertical feed push rod is arranged in the vertical feed clamp, the lower end of the spring abuts against the inner wall of the vertical feed clamp, and the upper end of the spring abuts against a boss on the vertical feed push rod.
3. The apparatus for testing the bonding strength of a molded bushing end face gasket to a substrate of claim 2, wherein: the vertical feeding clamp is composed of two parts which are symmetrically arranged in a left-right split mode, the left part and the right part are locked and fixed through bolts, a cylindrical inner groove is formed in the left part and the right part, and the inner groove is used for containing a vertical feeding push rod and a spring.
4. The apparatus for testing the bonding strength of a molded bushing end face gasket to a substrate of claim 1, wherein: the table-board of the working table is provided with a plurality of T-shaped grooves, and the portal frame and the precision vice are respectively fixed on the corresponding T-shaped grooves through the locking of the bolt and nut components.
5. The apparatus for testing the bonding strength of a molded bushing end face gasket to a substrate of claim 1, wherein: the radius of the semicircular push-cut block is equal to that of the outer ring of the gasket.
6. The apparatus for testing the bonding strength of a molded bushing end face gasket to a substrate of claim 1, wherein: it still includes high definition digtal camera, and this high definition digtal camera carries out fixed centre gripping by the magnetism gauge stand that adsorbs on the workstation mesa, high definition digtal camera is connected to the computer for real-time display and record tool setting and the image information of testing process.
7. The apparatus for testing the bonding strength of a molded bushing end face gasket to a substrate of claim 1, wherein: two clamping end parts of the precision vice are respectively fixed with a V-shaped block, and the shaft sleeve is fixed between the two V-shaped blocks.
8. The method for testing the bonding strength of a molded sleeve end face gasket to a substrate using the device for testing the bonding strength of a molded sleeve end face gasket as claimed in any one of claims 1 to 7, wherein: which comprises the following steps:
1) tool setting: detecting the average thickness h of the gasket by using a microscope; in an initial state, the semicircular push cutting block is positioned right above the liner, and the center line of the liner is superposed with the center line of the semicircular push cutting block by adjusting the precision vice; adjusting the vertical feeding clamp to enable the bottom of the semicircular push cutting block to be close to and contact with the upper surface of the gasket, and enabling the semicircular push cutting block to exit from the upper surface of the gasket in the horizontal direction by utilizing the linear motor module; then the semicircular push-cut block vertically moves downwards for 0.85 h-0.98 h under the driving of a vertical feeding module, the thickness g of the semicircular push-cut block is 1.2 h-1.8 h, finally a linear motor module is started to push the semicircular push-cut block to slowly attach to the outer circumferential surface of the gasket, and the tool setting can be completed by means of real-time imaging of a high-definition camera;
2) and (3) detecting the binding strength: starting a linear motor module and a linear displacement sensor, wherein the linear motor module drives a semicircular push-cut block to push a liner, the semicircular push-cut block continuously pushes the liner on the end face of a shaft sleeve to peel off and displace until the liner is completely pushed by the semicircular push-cut block to peel off the upper surface of the shaft sleeve, in the process, the linear displacement sensor detects displacement information of the liner in real time and inputs the displacement information into a computer for analysis and processing, and meanwhile, a dynamometer detects push-cut force signals generated by the push-cut liner in real time and inputs the push-cut force signals into the computer for analysis and processing after passing through a signal collector and a signal amplifier;
3) analysis and treatment:
after the push cutting process is completed, the comprehensive bonding strength sigma of the gasket and the substrate is calculated as follows:
wherein, FiThe signal value of the ith effective sampling push-cut force is detected by the dynamometer when the push-cut force is detected, i is 1,2 and 3 … N, N is the total effective sampling times, D is the diameter of the outer ring of the liner on the end face of the shaft sleeve, and D is the diameter of the inner hole of the shaft sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210127009.3A CN114295546A (en) | 2022-01-24 | 2022-01-24 | Device and method for detecting bonding strength between molded shaft sleeve end face gasket and substrate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210127009.3A CN114295546A (en) | 2022-01-24 | 2022-01-24 | Device and method for detecting bonding strength between molded shaft sleeve end face gasket and substrate |
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| CN114295546A true CN114295546A (en) | 2022-04-08 |
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| CN202210127009.3A Pending CN114295546A (en) | 2022-01-24 | 2022-01-24 | Device and method for detecting bonding strength between molded shaft sleeve end face gasket and substrate |
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| CN108254266A (en) * | 2018-03-22 | 2018-07-06 | 华侨大学 | A kind of measuring apparatus and method of the abrasive grain bond strength of fixed grain tool |
| CN211785044U (en) * | 2019-12-23 | 2020-10-27 | 深圳同兴达科技股份有限公司 | Holding clamp for viscosity test |
| CN113533081A (en) * | 2020-04-15 | 2021-10-22 | Oppo（重庆）智能科技有限公司 | Intensity detection device and method and computer storage medium |
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2022
- 2022-01-24 CN CN202210127009.3A patent/CN114295546A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008111739A (en) * | 2006-10-31 | 2008-05-15 | Oji Paper Co Ltd | Tool for thickness-wise shear test on sheet-like material and thickness-wise shear test machine |
| CN102359935A (en) * | 2011-09-29 | 2012-02-22 | 台州科锦轴承有限公司 | Curve peeling fixture and braided bearing gasket curve bonding quality testing method and system thereof |
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