A tool for measuring cross-sectional dimension of self-piercing riveting joint and a quality evaluation method

Abstract

The application provides a tool for measuring cross-sectional size of a self-piercing riveting joint and a quality evaluation method, which comprises a workbench, a pressing stop block, a positioning block, a supporting block and a cutting table; a riveting sample to be measured is installed on a cutting area on the side of the workbench, the riveting sample to be measured is placed on the supporting block and fixed through the positioning block, a sliding rail is arranged on a table panel of the workbench, the pressing stop block is slidingly installed on the sliding rail, the pressing stop block is used for transversely slidingly positioning and fixing the riveting sample to be measured, the cutting table is arranged above the workbench and used for cutting the riveting sample to be measured, the method and the tool can accurately obtain a meridian cutting detection surface of the riveting joint, can accurately, intuitively and reliably evaluate joint quality, can be used as a basis for analyzing causes of poor riveting quality, have important guiding significance for improving joint performance reliability, and have great significance for providing data analysis.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of whole vehicle parts design and test technology, in particular to a tool for accurately measuring the cross-sectional size of a self-piercing riveted joint and an evaluation method. BACKGROUND

[0002] With the increasing demand for lightweight vehicles, steel-aluminum body structures are becoming more and more popular, and the quality of the connection cannot be ignored, and the quality of the joint needs to be controlled. One of the main connection methods for steel-aluminum body structures is self-piercing riveting.

[0003] Self-piercing riveting is a mechanical connection, which is a cold connection technology used to connect two or more metal plates. After a specially designed rivet penetrates the top plate, the hollow structure at the tail of the rivet expands and penetrates the bottom plate under the action of the riveting die, thereby forming a firm riveting point. Thus, the purpose of material connection is achieved, and it is widely used in the connection of dissimilar materials.

[0004] With the increasing application of lightweight steel-aluminum body structures, the self-piercing riveting connection technology between steel-aluminum materials is also being used more and more, and the quality of the riveting directly affects the safety of the vehicle. Therefore, how to accurately and reasonably evaluate the quality of the self-piercing riveted joint is crucial, and it has extremely important significance for evaluating the rationality of the process and improving the reliability of the joint. SUMMARY

[0005] In view of the problems in the prior art, the present application provides a tool for accurately measuring the cross-sectional size of a self-piercing riveted joint and an evaluation method, thereby achieving the purpose of accurately and reasonably evaluating the quality of the self-piercing riveted joint.

[0006] The present application is achieved by the following technical solutions:

[0007] A tool for measuring the cross-sectional size of a self-piercing riveted joint, comprising,

[0008] a workbench, a pressing stop block, a positioning block, a support block, and a cutting table;

[0009] The riveted sample to be measured is installed on the side of the workbench in the cutting area, the riveted sample to be measured is placed on the support block and fixed by the positioning block, the workbench has a sliding rail on the top panel, the pressing stop block is slidingly installed on the sliding rail, the pressing stop block is used to horizontally slide and fix the riveted sample to be measured, and the cutting table is arranged above the workbench and used to cut the riveted sample to be measured.

[0010] Preferably, the positioning block is provided with a positioning hole, and the positioning hole is matched and fixed with the protruding part on the back of the rivet point of the riveted sample to be measured.

[0011] Preferably, the positioning block is in a T-shaped structure, and the workbench is in an L-shaped structure.

[0012] Preferably, the positioning block is provided with scale marks.

[0013] Preferably, the support block is provided with a cutting groove, and the support block is provided with a step for supporting the riveting sample.

[0014] A quality evaluation method for measuring the cross-sectional size of a self-piercing riveting joint, comprising,

[0015] After the riveting joint sample is cut by the self-piercing riveting joint cross-sectional size tool, the cut riveting joint sample is polished, and the cross-sectional size of the cut riveting joint sample is observed and measured by a microscope, and the quality performance of the riveting joint is evaluated by the single evaluation of each measurement index.

[0016] The related indexes include the base material specification T, the overlap gap, the rivet head height H, the interlock value IL / IR, the minimum thickness of the remaining material tmin, and the defect size.

[0017] Preferably, the base material specification T is consistent with the material defined specification, and the overlap gap and the defect size are additional evaluation bases for the riveting joint.

[0018] Preferably, the rivet head height H is qualified when it is -0.1 to +0.1 mm or -0.5 to +0.3 mm, otherwise it is unqualified.

[0019] Preferably, the interlock value IL / IR is qualified when it is greater than or equal to 0.1 mm or greater than or equal to 0.2 mm, otherwise it is unqualified.

[0020] Preferably, the minimum thickness of the remaining material tmin is qualified when it is greater than or equal to 0.1 mm or greater than or equal to 0.2 mm, otherwise it is unqualified.

[0021] Compared with the prior art, the present application has the following beneficial technical effects:

[0022] The present application provides a tool and an evaluation method for testing the cross-sectional size of a self-piercing riveting joint, which comprises a workbench, a pressing block, a positioning block, a support block, and a cutting table.

[0023] The to-be-tested riveting sample is installed on the to-be-cut area of the side of the workbench, is placed on the support block, and is fixed through the positioning block. A sliding rail is arranged on the table panel of the workbench, and the pressing block is slidably installed on the sliding rail. The pressing block is used for transversely sliding and positioning and fixing the to-be-tested riveting sample. The cutting table is arranged above the workbench and is used for cutting the to-be-tested riveting sample. The riveting joint meridian section detection surface with high precision can be obtained by using the tooling and method, and the measurement error caused by the sample preparation error is avoided, and the wrong conclusion is made. The joint section is measured by using the metallographic microscope, and the measurement items include but are not limited to the bottom thickness, the interlocking value, the head height and the like. The effectiveness of the riveting process is evaluated by using the data.

[0024] After the to-be-tested riveting sample is cut by using the tooling for measuring the riveting joint section size, the to-be-tested riveting sample is polished after being cut, and each related index of the cross section of the to-be-tested riveting sample is observed and measured by using the microscope. After each related index is measured and recorded, each measurement related index is evaluated for the qualification, and finally the quality performance of the riveting joint is evaluated by comprehensively evaluating each related index. The method and tooling can accurately obtain the riveting joint meridian section detection surface, can accurately, intuitively and reliably evaluate the joint quality, can be used as a basis for analyzing the riveting quality, has important guiding significance for improving the joint performance reliability, has high accuracy of the test result, has great significance for providing data analysis, can accurately reflect the riveting quality of the self-piercing riveting joint, can evaluate the rationality of the used process, and can give the opinion and suggestion for optimizing the riveting process, so that the joint performance is improved.

[0025] Further, the tooling has simple structure, low cost, good universality, fast and convenient installation and use, ensures the stability and accuracy of the sample preparation process, and improves the sample preparation efficiency.

[0026] Further, the support block of the tooling is provided with a cutting groove, so that the support block body is not damaged during cutting after being fixed.

[0027] Further, the positioning block of the tooling is provided with a scale mark, so that the positioning block can be quickly and tightly matched with the to-be-tested sample.

[0028] Further, the sliding rail is arranged on the workbench of the tooling, and the pressing block slides on the sliding rail, so that the to-be-tested sample can be tightly fixed. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The structure schematic view of the tooling for accurately measuring the self-piercing riveting joint section size in the embodiment of the application is shown in FIG. 1.

[0030] Figure 2 The structure schematic view of the workbench 1 in the embodiment of the application is shown in FIG. 2.

[0031] Figure 3 : schematic diagram of the structure of the pressing stopper 2 in the embodiment of the present application;

[0032] Figure 4 : schematic diagram of the structure of the positioning block 3 in the embodiment of the present application;

[0033] Figure 5 : schematic diagram of the structure of the supporting block 4 in the embodiment of the present application;

[0034] Figure 6 : schematic diagram of the structure of the cutting table 5 in the embodiment of the present application;

[0035] In the figure: workbench 1, pressing stopper 2, positioning block 3, supporting block 4, cutting table 5, to-be-tested riveting sample 6. DETAILED DESCRIPTION

[0036] The present application will be further described in detail below with specific examples, which are intended to explain but not limit the present application.

[0037] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts should fall within the protection scope of the present application.

[0038] The present application provides a tool for accurately measuring the cross-sectional size of a self-piercing riveting joint and an evaluation method.

[0039] As shown in Figure 1 , the tool for accurately measuring the cross-sectional size of a self-piercing riveting joint comprises a workbench 1, a pressing stopper 2, a positioning block 3, a supporting block 4, and a cutting table 5.

[0040] The to-be-tested riveting sample 6 is installed on the side of the workbench 1 to be cut, is placed on the supporting block 4, and is fixed by the positioning block 3. The workbench 1 is provided with a slide rail on the table panel. The pressing stopper 2 is slidably installed on the slide rail to horizontally slide and fix the to-be-tested riveting sample 6. The cutting table 5 is installed on the upper part of the workbench 1 to cut the to-be-tested riveting sample 6 to obtain a riveting joint meridian cross-section detection surface.

[0041] The workbench 1 comprises a side plate and a table panel. The workbench 1 is provided with a cutting groove on the side plate. The table panel of the workbench 1 is provided with a slide rail. The pressing stopper 2 is slidably installed on the slide rail.

[0042] Further, as shown in Figure 2 The workbench 1 comprises two slide rails; the two pressing blocks 2 are block-shaped structures, and the side in contact with the tabletop panel of the workbench 1 is provided with a protrusion, which is installed in the track of the slide rail, and the two pressing blocks 2 slide on the two slide rails to facilitate fastening of the riveting sample 6 to be tested. The height of the protrusion matches the depth of the slide rail;

[0043] Further, as shown in Figure 3 The positioning block 3 is in T-shaped structure and tightly cooperates with the side cutting area of the workbench 1; the positioning block 3 is provided with a positioning hole; the positioning hole is arranged on the vertical surface, and cooperates with the rivet point back protruding part of the riveting sample 6 to be tested to be fixed. The vertical direction of the positioning block 3 is provided with scale marks at both ends of the positioning hole to facilitate quick fastening cooperation with the riveting sample 6 to be tested.

[0044] Further, as shown in Figure 4 The support block 4 is used to support the riveting sample 6 to be tested to be stably fastened for cutting; the support block 4 is provided with a cutting groove to facilitate cutting without damaging the support block 4 after being fixed. The support block 4 is a thick plate structure, and the contact part of the support block 4 and the riveting sample 6 to be tested is provided with a step for placing the edge of the riveting sample 6 to be tested on the step to support the riveting sample 6 to be tested. The cutting groove of the support block 4 is on a horizontal line with the cutting groove on the workbench 1.

[0045] Further, the evaluation method for accurately measuring the cross-sectional size of the self-piercing riveting joint utilizes the tool for accurately measuring the cross-sectional size of the self-piercing riveting joint to accurately process the riveting sample.

[0046] Further, after polishing the cutting sample, the microscope is used to observe and measure various indicators of the cross section of the cutting sample.

[0047] Further, the various measurement indicators of the cross section of the sample include, but are not limited to, the base material specification T, the overlap gap, the head height H of the rivet, the interlocking value IL / IR, the minimum thickness tmin of the remaining material, the defect size, etc. The tool for accurately processing the riveting joint according to the present application can accurately obtain the meridian cross-sectional detection surface of the riveting joint, and can accurately, intuitively and reliably evaluate the joint quality. The rationality of the riveting process can be evaluated, which can be used as a basis for analyzing the causes of poor riveting quality, and has important guiding significance for improving the performance reliability of the joint.

[0048] Embodiment 1,

[0049] The present application relates to a tool for accurately measuring the cross-sectional size of a self-piercing riveting joint and a quality evaluation method, which comprises a tool for accurately measuring the cross-sectional size of a self-piercing riveting joint and an evaluation method. The sample preparation and evaluation steps are as follows:

[0050] Preparation before sample preparation:

[0051] In this embodiment, the protruding part of the rivet point back of the riveted sample 6 to be tested is positioned through the positioning hole of the positioning block 3, and placed on the support block 4 as shown in the figure. After the sliding positioning of the two pressing blocks 2 placed on the workbench 1, the positioning block 3 is tightened and fixed. The riveted sample 6 to be tested is cut through the cutting table 5 as shown in the figure to accurately obtain the riveted joint meridian section detection surface. Figure 4 Figure 5 After the sample is cut, the treatment: Figure 2 Figure 6 In this embodiment, after the riveted sample is polished after cutting, the cross section of the sample is observed and measured by microscope. The relevant indicators include but are not limited to the specification T of the base material, the overlap gap, the head height H of the rivet, the interlocking value IL / IR, the minimum thickness tmin of the remaining material, the defect size, etc.

[0052] Joint quality evaluation:

[0053] In this embodiment, after measuring and recording each index, each measurement index is evaluated singly, and the joint performance is finally evaluated comprehensively.

[0054] Joint quality evaluation:

[0055] In this embodiment, the specification T of the base material is consistent with the specification defined by the material, otherwise it needs to be verified and confirmed.

[0056] In this embodiment, the overlap gap and the defect size are used as additional evaluation basis for whether the joint is qualified or not.

[0057] In this embodiment, the head height H of the rivet is the height difference between the upper end of the rivet and the upper end of the base material. The head height H of the rivet needs to be controlled within-0.1~+0.1mm, -0.5~+0.3mm, otherwise it is considered unqualified.

[0058] In this embodiment, the interlocking value IL / IR is the horizontal distance between the left / right side tip of the rivet tail and the cutting point of the rivet cutting into the bottom plate. The interlocking value IL / IR needs to be greater than or equal to 0.1mm, greater than or equal to 0.2mm, otherwise it is considered unqualified.

[0059] In this embodiment, the minimum thickness tmin of the remaining material is the plastic deformation of the lower plate after riveting near the edge of the riveting die. The thinnest part of the remaining material is the minimum thickness of the remaining material. The minimum thickness tmin of the remaining material needs to be greater than or equal to 0.1mm, greater than or equal to 0.2mm, otherwise it is considered unqualified.

[0060] In this embodiment, the minimum thickness tmin of the remaining material is the plastic deformation of the lower plate after riveting near the edge of the riveting die. The thinnest part of the remaining material is the minimum thickness of the remaining material. The minimum thickness tmin of the remaining material needs to be greater than or equal to 0.1mm, greater than or equal to 0.2mm, otherwise it is considered unqualified.

[0061] ​​It has to be understood that the terms "comprising", "having", "including" and any other similar referential terms as used in the description and in the claims of the present application are used in the sense of "including at least the recited step or element, but not excluding others". It has to be understood that the terms "comprising", "having", "including" and any other similar referential terms as used in the description and in the claims of the present application are used in the sense of "including at least the recited step or element, but not excluding others".

[0062] It has to be understood that when an element as a component is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. In addition, when an element is referred to as being "connected" to or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements can also be present. In addition, when an element is referred to as being "positioned on" another element, it can be directly on the other element or intervening elements can also be present.

[0063] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this description, the singular forms "a", "an" and "the" include plural references unless the context clearly dictates otherwise. The term "and / or" includes any and all combinations of one or more of the associated listed items.

[0064] The above description is only preferred embodiments of the present application, and is not intended to limit the present application in any form. Any person skilled in the art can easily implement the present application according to the drawings and the above description. However, any equivalent changes, modifications and variations of the present application made by those skilled in the art without departing from the scope of the present application, which is defined by the appended claims, are intended to be within the scope of the present application.

Claims

1. A tooling for measuring the cross-sectional dimensions of a self-piercing riveting joint, characterized in that, include, Workbench (1), clamping block (2), positioning block (3), support block (4) and cutting table (5); The riveting sample (6) to be tested is installed on the side of the workbench (1) in the area to be cut. The riveting sample (6) to be tested is placed on the support block (4) and fixed by the positioning block (3). The clamping block (2) is slidably installed on the tabletop of the workbench (1) to fix the riveting sample (6) to be tested laterally. The cutting table (5) is set above the workbench (1) to cut the riveting sample (6) to be tested. The positioning block (3) is provided with a positioning hole, which is fixed in conjunction with the protruding part on the back of the rivet point of the riveting sample (6) to be tested; The workbench (1) is provided with a slide rail on its tabletop, and the clamping block (2) is slidably installed on the slide rail. The clamping block (2) is used to laterally slide and fix the riveted sample (6) to be tested. The positioning block (3) is provided with scale markings. The positioning block (3) has a T-shaped structure, and the worktable (1) has an L-shaped structure. The support block (4) is provided with a cutting groove, and the support block (4) is provided with a step for supporting the riveted sample (6) to be tested.

2. A quality evaluation method for measuring the cross-sectional dimensions of a self-piercing riveting joint, based on the tooling for measuring the cross-sectional dimensions of a self-piercing riveting joint as described in claim 1, characterized in that, include, After cutting the riveting sample (6) to be tested using the tooling for the cross-sectional dimensions of the self-piercing riveting joint, the riveting sample (6) to be tested is obtained by meridional sectioning and inspection. After grinding and polishing the cut riveting sample (6), the cross-section of the cut riveting sample (6) to be tested is observed and measured using a microscope. After measuring and recording the relevant indicators, the qualification of each measured relevant indicator is evaluated individually. Finally, the quality performance of the riveting joint is evaluated by comprehensively considering all relevant indicators. The relevant indicators include the base material specification T, lap gap, rivet head height H, interlocking value IL / IR, minimum remaining material thickness tmin, and defect size.

3. In the quality evaluation method for measuring the cross-sectional dimensions of a self-piercing riveting joint according to claim 2, the base material specification T must be consistent with the material definition specification, and the lap gap and defect size serve as additional evaluation criteria for whether the riveting joint is qualified.

4. In the quality evaluation method for measuring the cross-sectional dimensions of a self-piercing riveting joint according to claim 2, the head height H of the rivet is considered qualified when it is between -0.1 and +0.1 mm or between -0.5 and +0.3 mm, otherwise it is considered unqualified.

5. In the quality evaluation method for measuring the cross-sectional dimensions of a self-piercing riveting joint according to claim 2, the interlocking value IL / IR is considered qualified when it is greater than or equal to 0.1 mm or greater than or equal to 0.2 mm, otherwise it is considered unqualified.

6. In the quality evaluation method for measuring the cross-sectional dimensions of a self-piercing riveted joint according to claim 2, the minimum thickness tmin of the remaining material is considered qualified when it is greater than or equal to 0.1 mm or greater than or equal to 0.2 mm, otherwise it is considered unqualified.

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