KR100878650B1 - Apparatus for testing Tension of welded materials - Google Patents

Abstract

Provided is a high speed tensile testing apparatus for bonding materials in which the bonding of materials, in particular, high-speed tensile testing of welding properties, is effected to affect the durability of the structure made of the bonded material.

The high-speed tensile test apparatus for the bonding material, the first and second jig means comprising a first and second grip connection portion connected to the first and second jig portion to which the joined material is fixed and the grip means respectively; And a first grip means provided as an upper jig of a fixed type which is fixedly arranged while being fixedly connected with the first grip connection part, and a second grip means which is provided in a movable type while having a jaw member to which the second grip connection part is fixedly connected. The second grip means includes a split upper body having jaw members fixed between the second grip connection part, and a lower part integrally extended downwardly from a lower part thereof and connected to a driving source at a lower end thereof. body; And a lower jig including a fastening means fastened through the upper body to fix the second grip connection portion as the jaw member.

According to the present invention, a high-speed tensile test for measuring the physical properties of spot welds, i.e., material joints, of steel sheets affecting the durability of automobiles can be performed more precisely, and an improved effect of simplifying the measurement work can be obtained. Can be.

Bonding strength, automotive steel plate, spot welding of steel sheet, tensile material tensile test

Description

Apparatus for testing Tension of welded materials

1 is a block diagram showing the overall configuration of the high-speed tensile testing apparatus of the bonding material according to the present invention

Figure 2 is a block diagram showing an operating state of the device of the present invention of FIG.

3A and 3B are a perspective view and a structural view showing the jig means and the specimens fixed thereto according to the present invention

4 is a perspective view of a second grip means in the device of the invention;

5 is a plan view of FIG.

6 is a side view of FIG. 4

7 is a configuration diagram showing a request state of the strain gauge to the first jig means in Figure 3a

8a and 8b are graphs showing the test results and the strain gauge measurement results of the apparatus of the present invention.

Explanation of symbols on the main parts of the drawings

1 .... High Speed Tensile Testing Equipment of Bonding Materials

10,30 .... first and second jig means 12,32 .... first and second jig means

14,34 .... First and second grip connections 50 .... First grip means

70 .... second grip means 72 .... jaw member

74a, 74b .... upper body 76 .... lower body

78 .... Tightening means 80 .... Driving source

90 .... grip control 92 .... wedge

93a, 93b .... Guide block 94 .... Wedge stop

96 .... Guide rod

The present invention relates to a high-speed tensile test apparatus of a bonded material for testing the bonding properties of the materials affecting the durability of the structure implemented by the material bonding, more specifically to measure the physical properties of the spot welds of the steel sheet as a vehicle material The present invention relates to a high-speed tensile test apparatus for a joining material which makes a high-speed tensile test to be more precise and facilitates the measurement operation.

In the case of forming a structure by joining materials by welding or the like, the durability of the structure is influenced by the physical property of the joint portion of the material, that is, the tensile strength, which is the bonding strength.

For example, such a bond strength is a representative example of the durability of the structure, the bond strength of the automotive steel plate used as the (frame) material of the vehicle and spot welded by the robot operation affects the durability of the vehicle.

That is, excellent characteristics of the bonding strength and the breaking strength of the spot welding portion for various kinds of materials used in automobiles are required.

By the way, the joint strength of the material such as spot welding of the steel sheet is welded to the steel sheet under the same conditions as the actual product in advance, and a test is performed to measure the tensile force of these welds.

For example, the welded steel sheets are forcibly pulled in opposite directions and the tensile strength is measured to test the strength characteristics of the welded portion in advance.

However, the bond strength test fixtures known to date have been mostly pulled by pulling specimens from both sides and applying tension.

Therefore, most of the conventional material joints, for example, spot weld joint strength test of steel sheets, were not in the form of high speed tensile test.

As a result, this type of tensile test has a limit in responding to the demands of consumers who demand better bonding properties.

That is, in the prior art, the material properties such as bonding strength through a tensile tester were made, but a high speed tensile test apparatus having a high speed was not proposed.

For example, there are many kinds of steel parts used in automobiles, and in order to combine these parts, it is common to adopt a joining method using spot welding to make parts with safe durability.

To evaluate the proper welding condition for spot welding used in the joining method of many parts, the method used so far is to separate the welding part by a simple separation device, measure the nugget size of the welding part, and determine the welding characteristics. Although the welding strength is evaluated by the tester, the weld strength evaluation at the high speed is not properly tested.

Accordingly, there has been a demand for a high-speed tensile test apparatus for a bonded material that can test the joint strength of the material, in particular, the spot weld joint strength of the automotive steel sheet at a high speed of at least 2 m / s or more, thereby providing optimum spot welding characteristics. There has been a need for an apparatus that allows for the production of products that have been tested and that provide optimum bonding properties.

The present invention has been made in order to improve the above-mentioned conventional problems, and an object of the present invention is to make a high-speed tensile test for measuring the physical properties of the joint material, that is, the spot welded portion of a steel sheet for automobiles, and at the same time, to measure the precision thereof. An object of the present invention is to provide a high-speed tensile test apparatus for joining materials that facilitates operation.

As a technical aspect for achieving the above object, the present invention includes a first and second grip connection portion is connected to the first and second jig portion to which the bonded material is independently seated and fixed and respectively connected to the grip means First and second jig means; And a first grip means provided as an upper jig of a fixed type which is fixedly arranged while being fixedly connected with the first grip connection part, and a second grip means which is provided in a movable type while having a jaw member to which the second grip connection part is fixedly connected. Including,
The second grip means, the upper body of the divided form having the jaw member is fixed between the second grip connecting portion; and the lower body is integrally extended downwardly from the lower portion of the upper body is connected to each other A lower body to which the driving source is connected to the connection portion; And a fastening means fastened through the upper body to fix the second grip connection part as the jaw member.
Preferably, the material is provided as a steel sheet specimen, the steel sheet specimens are cross-welded in a cross shape to facilitate attachment to the first and second jig means to test the welding strength of the steel sheet to the first and second It is fixed to the jig means.
More preferably, the first and second grip connecting portions of the first and second jig means are integrally vertically connected to the first and second jig parts, and the jaw members provided in the first grip means and the second grip means. In each linkage is fixed.
The first grip means is fixedly disposed on an upper portion of the tensile test apparatus while the first grip connection part vertically connected to the first jig portion to which the bonding material is fixed is connected and fixed.
And a wedge configured to form a gap between the jaw member and the second grip connection part at a first position while being disposed between the guide blocks respectively provided on the upper body of the second grip means. And a wedge is released from the guide block of the upper body while the wedge is passed in the vertical direction and the lower body of the second grip means is driven down by the driving source in the second position so that the jaw member is connected to the second grip. It is configured to enable a high speed descending of the second grip means from the first position to the second position, including a guide rod having a wedge stopper provided to secure the fitting.
In addition, the contact surface between the wedge is sandwiched between the guide block and the wedge provided in the upper body of the second grip means is formed to be inclined to facilitate the wedge separation.
Preferably, a strain gauge is attached to at least one of the first and second grip connections of the first and second jig means, to which the bonding material is fixed, respectively.
More preferably, the driving source is driven in response to a predetermined test condition, but is provided as an electric power or hydraulically driven actuator that is connected to the device control unit to control the driving.

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Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In the high speed tensile test apparatus of the joining material of the present invention, it is primarily an apparatus for testing the joining strength of the welded portion, for example, by spot welding the steel sheet crosswise to the welded portion at high speed.

To this end, unlike the known methods, the tensile test is performed at high speed to evaluate the welding characteristics such as nugget size and breaking bond strength.For the durability of the parts, welding current, pressing force, welding time, which are point welding conditions Optimum conditions such as the above can be applied to a material under test, for example, a steel sheet for automobiles (plated steel sheet), thereby making it possible to secure basic data that makes it possible to produce steel having excellent spot welding characteristics.

For example, in order to evaluate the spot welding strength of steel produced in automobiles and industries, a spot welded tensile specimen is made crosswise on the material in a spot welder with welding conditions set, and a high-speed tension with high speed using the cross-shaped specimen is made. Test specimens are placed in the tester and subjected to a high-speed tensile test to evaluate the tensile bond strength at high speed of the spot welds.

Hereinafter, a preferred embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

First, Figure 1 and Figure 2 shows the overall configuration of the high-speed tensile test device 1 of the bonding material of the present invention, Figure 1 shows the test standby state, Figure 2 shows the state of testing completed. .

That is, the high-speed tensile test apparatus 1 of the bonding material of the present invention, the first and second jig means 10 and 30 for respectively independently fixing the large welded material, and the first and second jig means (10) (30) are each characterized in that it comprises a first and second grip means (50) 70, which are fixedly connected and one is fixedly arranged, the other is provided to be movable.

In this case, as shown in Figure 3a and 3b, the material to be tested is provided as a steel sheet specimen (2a) (2b), for example, a steel sheet specimen cut in a rectangular form for automotive steel sheet, the steel sheet specimen (2a) ) 2b may be provided crosswise in the center of the spot weld (W).

Therefore, the apparatus of the present invention basically attaches the steel plate specimens to the first and second jig means 10 and 30 in the form of a cross in the state of spot welding (W), respectively, and the first and second jig means 10 One of the first and second grip means 50 and 70 to which the 30 are respectively connected is fixed, and the other is moved at high speed (specifically, lowering) to spot welding in the process of mutual separation of the spot welded specimens. The characteristic is to get the physical properties of the site.

Next, FIG. 3 shows the first and second jig means 10 and 30 for attaching the steel plate specimens 2a and 2b of the present invention.

For example, as illustrated in FIGS. 3A and 3B, the first and second jig means 10 and 30 may include first and second jig portions 12 and 32 to which steel sheet specimens, which are materials, are respectively seated and fixed. The first and second grip connecting portions 14 and 34 are integrally formed with the jig parts 12 and 32 and integrally fixed to the first and second grip means 50 and 70.

At this time, the first jig means 10 is actually an upper jig, the second jig means 30 is provided as a lower jig, bolts to be seated and fixed to the jig portion in each steel plate specimen (2a) (2b) Holes h to which B and nut N are fastened are formed.

That is, the jig parts 12 and 32 of the first and second jig means 10 and 30 are alternately arranged crosswise to match the steel plate specimens welded in the cross shape, and the first and second jig means 10 are disposed at the center of the jig parts. 2 grip connecting portions 14 and 34 are vertically integrally connected, and the grip connecting portion is inserted between the first grip means 50 on the upper side and the jaw member 72 of the second grip means 70 on the lower side. It may be a plate to be fixed in association.

Of course, as shown in Figure 3b, the steel sheet specimen (2a) (2b) is the spot welding (W) in the center portion of the pre-set welding conditions, for example, welding current, pressing force, welding time, etc. .

1 and 3A, the first grip means 50 is provided as an upper grip means in which the grip connecting portion 14 of the first jig means 10 is connected and fixed and fixedly arranged.

That is, the grip connecting portion 14 of the first jig means 10 is connected and fixed to the first grip means 50.

4 to 6 show a second grip means 70, i.e., a lower grip means, which enables high-speed tensile characteristics testing in the apparatus 1 of the present invention.

That is, as shown in Figures 4 and 5, in the device of the present invention, the second grip means 70, the jaw member 72 for fixing the grip connection portion 34 of the second jig means 30 The upper body 74a (74b) of the divided form provided with each, and the lower body 76 is connected to the lower portion extending downward of the upper body and the drive source 80 is connected to the connection portion, and the upper body It includes a fastening means 78 is fastened through the fastening means to secure the grip means connecting portion of the second jig means as a jaw member.

In this case, the driving source 80 is driven in response to a test condition set in advance, and is connected to an apparatus control unit (not shown) and is provided as an electric power or hydraulically driven actuator that is controlled to be driven and connected to the lower body 76. It consists of an actuating rod (80b) and the actuator body (80a) connected to the 76a.

Therefore, as the driving source 80 is operated, the lower body 76 is lowered integrally at a high speed, and at this time, the grip connecting portion 34 of the second jig means fixed to the jaw member 72 is pulled downward integrally. Under the force, the welded portions of the steel plate specimens 2a and 2b are separated, and thus the welding strength, that is, the joining characteristics, is converted into data, thereby obtaining test data, that is, load data as shown in FIG. 8A.

By the way, in the apparatus 1 of the present invention, the jaw member 72 initially has the second jig means so that the second grip means 70 allows the high-speed tensile test to be possible more than when the second grip means 70 is lowered. While the grip connecting portion 34 of the lowering state is not fixed, the jaw member after the predetermined time, and further comprises a grip control means 90 to instantaneously fix the grip connection portion to implement the high speed of falling.

That is, the grip control means 90 of the present invention is disposed between the upper body of the second grip means 70 and the grip connection portion of the jaw member 72 and the second jig means in the first position P1. Wedge 92 allowing a gap (G in FIG. 1) to be formed between the 34 and the wedge 92 in the vertical direction, and at the second position P2, the wedge when the second grip means is lowered. A guide rod 96 is provided with a wedge stopper 94 for blocking the lowering of the wedge while being taken by 92.

Thus, as shown in Figures 2, 4 and 5, the guide rod 96 has a lower end fixed to the bottom and the stopper portion 94 is formed in a shape that protrudes more from the guide rod, When the lower body 76 of the second grip means is lowered, the wedge 92 fixed between the divided bodies 74a and 74b is supported while reaching the guide rod stopper 94 and is no longer supported. And only the lower body is lowered.

That is, the departure from the upper body of the wedge 92 is generated.

At this time, the fastening means 78, ie, the bolt 78a and the nut 78b, which are fastened by passing through the divided bodies 74a and 74b of the second grip means 70, is used as a pretension bolt. Since the upper parts of the wedge 92 are tightened through each other, the grip connecting portion 34 of the second jig means 30 has a gap between the jaw members 72 in the first position of the wedge 92 (see P1 in FIG. 1). As described above, when the wedge 92 is supported at the upper end of the guide rod stopper 94 when the lower body is lowered and is separated between the upper bodies, the jaw member 72 at this moment is the fastening means 78. The second grip connection portion 34 of the second jig means 30 is tightly tightened while the clamping force is transmitted. Therefore, the jaw member integrally with the lower body and the divided upper body which are lowered by the driving source tighten the second grip connection portion. Pulled downward while fixed.

As a result, upon detachment of the split top body of the wedge from the second position of the guide rod stopper 94 (see P2 in FIG. 2), the second grip connection part 34 is fixed by the jaw member. The lower body lowering speed by the driving source can be realized between the first position P1 and the second position P2 of the guide rod stopper 94 at a high speed.

That is, since the jaw member does not fix the grip connection part of the second jig means from the beginning, but rather descends from the P1 position of FIG. 1 to the P2 position of FIG. 2 and then the jaw member catches the grip connection part of the second jig means. Descent speed by width, i.e. high speed tensile testing.

In addition, the guide rods 96 are disposed on both sides of the guide rods 96 while passing through the wedges 92 in a state of being fixed between the divided upper bodies 74a and 74b in the initial first position P1 as shown in FIG. 1. Grip means 70, that is, serves as a guide when lowering the lower grip means.

At this time, as shown in FIGS. 1,2 and 4, the wedge 92 is fitted between the guide block (93a) (93b) provided in the second grip means upper body (74a, 74b), respectively. The contact surface of the wedge and the guide block is formed to be inclined upward to restrict the wedge grip direction of the wedge.

Thus, as shown in FIG. 2, the wedge 92 is guide blocks 93a and 93b in a second position P2 where the wedge 92 contacts the vertical guide rod stopper 94 and is separated from the divided upper body. Easily separated upward along the inclined surface of the), in this case, the second grip connection portion 34 of the second jig means 30 is quickly fixed by the jaw member 72.

In this case, as shown in FIG. 8B, a vibration phenomenon may occur at high speed due to the characteristics of the high-speed tensile test apparatus such as the apparatus of the present invention, and the first grip connecting portion 14 of the first jig means 10 may be formed. When the strain gauge S is attached and tested, vibration-free load data can be obtained at high speed. That is, FIG. 8B is load data obtained by the high-speed tensile test of steel sheet specimens when a strain gauge is used.

On the other hand, summarized the work steps of the high-speed tensile test device, namely, the spot welding high-speed tensile test of the bonding material of the present invention described so far as follows.

1 and 2, the first grip connecting portion 14 of the first jig 10, which is the upper jig, is inserted into and fixed to the upper grip, which is the first grip means 50, and is spot welded crosswise. (W) The produced steel plate specimens 2a and 2b are fastened and fixed to bolts and nuts to the first and second jig parts 12 and 32 of the first and second jig means, respectively.

At this time, the lower end portion of the second grip connecting portion 34 of the second jig means 30 is inserted between the jaw member 72 of the second grip means 70, and the wedge 92 passes through the guide rod 96. Prepare the test in one state.

Then, when the test is started by controlling the device, that is, when the operation rod 80b of the actuator, which is the driving source 80, is moved downward, the lower body 76 and the divided upper body 74a of the second grip means 70 are operated. 74b and the jaw member 72 between them descend integrally with the clearance of the lip connection part 34 of the 2nd jig | tool 30. As shown in FIG.

At this time, when the wedge 92 is in contact with the guide rod stopper 94 and is no longer lowered and is separated between the divided upper bodies that continue to descend, the split body of the fastening bolt 78, which is a pretension bolt, is instantaneous. As the tightening force is transmitted to the jaw member 72, the grip connection of the second jig means between the jaw members is fixed by a minute gap, and at this moment, a high-speed tensile test of the device of the present invention is made, and the points of the cross-shaped steel sheet specimens are pulled by the tension force. When the welded part is removed and the set condition is completed, the operation of the driving source is stopped through the device control unit (not shown) and the load data is displayed as shown in FIG. 8A.

Meanwhile, as shown in FIGS. 1, 2 and 4, the lower end of the stopper 94 and the actuator 80 of the guide rod 96 are mounted on the lower base G2, and the second grip means is disposed on the upper portion thereof. An upper base G1 having an opening through which the lower body 76 of the 70 and the guide rod vertically pass may be provided.

At this time, the upper base (G1) serves as a work table for mounting the device of the specimen, the lower base (G2) may be a factory floor where the device is disposed.

Thus, according to the high speed tensile test apparatus of the joining material of the present invention, the high-speed tensile test for measuring the physical properties of the spot welds of the steel sheet, which is the automotive material, is more precise, and the measurement operation is convenient.

In particular, since the specimen is pulled instantaneously in a state where high speed is implemented after a predetermined time at the position where the initial specimen is bitten by the device, more precise steel plate welding characteristics are tested to enable a high-speed tensile test.

While the invention has been shown and described in connection with specific embodiments so far, it will be appreciated that the invention can be varied and modified without departing from the spirit or scope of the invention as set forth in the claims below. It will be appreciated that those skilled in the art can easily know.

Claims (9)

A first and second grip connection parts 14 and 34 connected to the first and second jig parts 12 and 32 to which the joined materials are independently seated and fixed, respectively; Two jig means (10, 30); And a jaw member 72 in which the first grip means 50 is provided as a fixed upper jig which is fixedly arranged while the first grip connection part 14 is connected and fixed, and the second grip connection part 34 is connected and fixed. Includes; and the second grip means 70 provided to be movable while having, The second grip means 70 may include: split upper bodies 74a and 74b having the jaw members 72 to which the second grip connection portion 34 is secured therebetween; and the upper body Lower body 76 which is integrally extended downward from the lower side of the field but connected to each other while the lower end 76 is connected to the drive source 80; And fastening means 78 fastened through the upper bodies 74a and 74b to fix the second grip connection portion 34 as the jaw member 72. High speed tensile test equipment for bonding materials. The method of claim 1, wherein the material is provided as a steel sheet specimen, the steel sheet specimen is welded to the cross (W) in the form of cross (W) to facilitate the separate attachment to the first and second jig means (10, 30) of the steel sheet A high-speed tensile test apparatus for a joining material, characterized in that the welding strength is fixed to the first and second jig means to test. The first and second grip connecting portions 14 and 34 of the first and second jig means are integrally vertically connected to the first and second jig parts 12 and 32 and the first grip. High speed tensile testing apparatus of the bonding material, characterized in that the means (50) and the jaw member (72) provided in the second grip means (70), respectively. According to claim 1 or claim 3, wherein the first grip means 50, the first grip connecting portion 14 connected perpendicular to the first jig portion 12 to which the bonding material is fixed while the tensile test A high speed tensile test device for bonding material, characterized in that it is fixedly placed on top of the device. delete According to claim 1, wherein the jaw member in the first position (P1) is disposed between the guide blocks (93a, 93b) provided in the upper body (74a, 74b) of the second grip means (70), respectively 72 and a wedge 92 configured to form a gap G between the second grip connection portion 34; And, Pass the wedge 92 in the vertical direction and the wedge is caught when the lower body of the second grip means by the drive source 80 is lowered in the second position (P2) is configured to be released from the guide block of the upper body A guide rod 96 having a wedge stopper 94 provided to secure the jaw member to fit the second grip connection portion 34; And a grip control means (90) configured to enable a high speed descending of the second grip means from the first position to the second position, including. The contact surface of the wedge and the guide block (93a) (93b) of the wedge 92 is sandwiched between the wedge 92 and provided on the upper body (74a) (74b) of the second grip means High-speed tensile test device for a bonding material, characterized in that formed to be inclined to facilitate the separation. The strain gauge (S) is attached to at least one of the first and second grip connecting portions (14, 34) of the first and second jig means (10) (30) to which the bonding material is fixed. High speed tensile test apparatus of the bonding material, characterized in that. According to claim 1, wherein the drive source 80 is driven in response to a predetermined test condition, the high-speed tension of the bonding material, characterized in that it is provided as an electric power or hydraulically driven actuator connected to the device control unit is controlled to drive tester.

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