KR200488202Y1 - Jig apparatus for strength test - Google Patents

Abstract

The present invention relates to a jig device for strength testing for testing the strength of a stud welded test piece.
The jig device for strength testing according to the present invention comprises a yoke which is fixed to one side of a strength tester and is pulled, a retaining rod which is sandwiched between the yoke and a welding test piece is caught, a gap holding member which is sandwiched between the retaining rod and the welding test piece, To the welded test specimen to fix the welded test specimen and to prevent the deformation and fracture of the tube ring of the welded specimen to obtain accurate strength test results and to apply to welded specimens having tube rings of various sizes And facilitates bonding and separation of the welding test pieces before and after the strength test.

Description

[0001] The present invention relates to a jig apparatus for strength test,

The present invention relates to a jig device for strength testing for testing the strength of a stud welded test piece.

Stud welding is the arc welding of welding elements such as threaded studs, pins, tapped pads, etc., without additional material, which generates an arc between the surface of the welding element and the surface of the workpiece , And when the contact portion between the welding element and the workpiece is melted by the arc, the welding element is welded by pressing the surface of the workpiece.

Stud welding results in the strength of the joint being stronger than that of the workpiece itself or the welding element, since the entire contact surface of the welding element is bonded to the workpiece. Stud welding is used in the fields of sheet metal processing, electronics industry, mining / switchboard, laboratory and medical equipment, beverage / food processing industry, consumer electronics, telecom engineering, vending machines, windows, glass manufacturing, insulation materials technology, kitchen furniture, Marine, structural and civil engineering, power plants and heating, boiler and plant equipment, insulation and windows.

The welded part welded with the welded element and the workpiece is subjected to the strength test to measure the welded force. For the strength test, weld test specimens are prepared and welded test specimens are mounted on tensile tester or shear tester. For example, the tensile test was conducted by ASME Sect. IX (QW.192).

The test specimens for the test are in the form of studs welded to the outer surface of the tube ring. The tube ring is hooked on the jig of the jig of the tensile tester and the tensile test is carried out by pulling the stud. In this way, during the tensile test, the tube portion of the welded test piece may be deformed or broken, so that accurate test results may not be obtained.

Korean Patent Publication No. 10-1999-028099 (published on April 15, 1999).

The object of the present invention is to provide a jig device for strength testing that can prevent the deformation and breakage of the tube ring of the welded test piece during the strength test of the stud welded test piece to obtain accurate strength test results.

A strength testing jig apparatus according to an embodiment of the present invention includes a yoke, a retaining rod, a gap holding member, and a fixing means. The jig apparatus is a strength testing jig apparatus to which a welding test piece having a stud welded to the outer peripheral surface of a tube ring is mounted. The yoke is fixed to one side of the strength tester and pulled. The retaining rod is a member that is sandwiched between the yoke and the welding test piece. The gap holding member is sandwiched between the retaining rod and the welding test piece to maintain a gap therebetween. The fixing means fixes the welding test piece by bringing the gap holding member into close contact with the welding test piece.

The inner surface of the latching bar of the jig device for strength testing according to an embodiment of the present invention may be provided with concavities and convexities.

The gap holding member of the jig device for strength testing according to an embodiment of the present invention may include a body fitted to the engagement rod and a detachable piece which is detachably fitted to the body and is in close contact with the inner surface of the welded test piece.

The fixing means of the jig device for strength testing according to one embodiment of the present invention comprises a finishing plate which is closed in close contact with a side surface of a flange or a locking bar of the yoke, a fixing bar which is installed through the inside of the locking bar, Includes nuts.

The inner side surface of the gap holding member of the jig device for strength testing according to an embodiment of the present invention is formed as a circular arc surface and a pressurizing portion is provided in the middle of the stationary rod to press the gap holding member in close contact with the arc surface.

According to the present invention, it is possible to obtain the accurate strength test result by preventing the deformation and fracture of the tube ring of the welded specimen during the strength test of the stud welded specimen and to apply to the welded test specimen having the tube ring of various sizes, Thereby facilitating the bonding and separation of the welding test piece.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a configuration diagram showing a stud welding test piece to which a jig device for strength testing according to the present invention is applied.
2 is a configuration diagram showing a jig device for strength testing according to a first embodiment of the present invention.
3 is a cross-sectional view of the state where the yoke and the welding test piece are removed in Fig.
4 is a sectional view taken along the line AA in Fig.
5 is a cross-sectional view taken along line BB in Fig.
Fig. 6 is a perspective view showing the gap holding member of Fig. 3;
7 is an explanatory diagram for explaining the operation of the jig device for strength testing according to the first embodiment of the present invention.
8 is a cross-sectional view showing a retaining bar of a jig device for strength testing according to a second embodiment of the present invention.
9 is a cross-sectional view showing a state in which a gap holding member of a jig device for strength testing according to a third embodiment of the present invention is coupled to a retaining bar.
10 is a perspective view showing the gap holding member in Fig.
11 is a perspective view showing a gap holding member of a jig apparatus for strength testing according to a fourth embodiment of the present invention.
12 is a photograph showing a state in which a jig device for strength testing and a welded test piece according to a comparative example for comparison with the embodiment of the present invention are mounted on a tensile testing machine.
13 is a photograph showing a state in which the welding test piece mounted on the tensile testing machine of Fig. 12 is deformed and broken.

The present invention is capable of various modifications and various embodiments, and it is intended to illustrate and explain the specific embodiments in detail. It should be understood, however, that the intention is not to limit the invention to the particular embodiments, but to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terminology used in this specification is used only to describe a specific embodiment and is not intended to limit the present invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" are intended to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, or combinations thereof. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. Note that, in the drawings, the same components are denoted by the same reference symbols as possible. Further, detailed descriptions of known functions and configurations that may obscure the gist of the present invention will be omitted. For the same reason, some of the components in the drawings are exaggerated, omitted, or schematically illustrated.

Fig. 1 is a configuration diagram showing a stud welding test piece to which a jig device for strength testing according to the present invention is applied, Fig. 2 is a configuration diagram showing a jig device for strength testing according to a first embodiment of the present invention, Sectional view showing a state in which the yoke and the welding test piece are removed.

1, a welding test piece 10 for strength testing is formed by welding a stud 12 to the outer circumferential surface of a tube ring 11 so as to protrude along a radial direction, It is a specimen to be tested. 2, the welding test piece 10 is installed on the retaining rod 120 of the jig device 100 for strength testing by way of a gap retaining member 130. As shown in FIG. Hereinafter, the tensile strength test of the welding test piece 10 will be described as an example.

2 and 3, the jig apparatus 100 for strength testing according to the first embodiment of the present invention includes a yoke 110, a retaining rod 120, a gap holding member 130, and a fixing means 140, .

The yoke 110 is fixed on one side of the strength tester and is pulled and fixed to a yoke 111 having a flange 111a on which the stopper rod 120 is mounted and a web 111b of the yoke 111 And a connecting rod 112 connected to the strength tester. The connecting rod 112 is screwed to and detachable from the web 111b of the yoke 111 and may be fixed to the web 111b.

2 and 3, the engaging rod 120 is fitted in a flange 111a formed in the yoke 111 of the yoke 110 so that the welding test piece 10 is caught by the gap holding member 130 Member. The engaging rod 120 has a cylindrical portion 121 fitted to the flange 111a of the yoke 111 and a base plate portion 122 formed at one end of the cylindrical portion 121 and engaged with the outer surface of the flange 111a .

On the circumferential surface of the cylindrical portion 121, a plurality of slits 121a into which the spacing member 130 is movably fitted are formed along the longitudinal direction of the cylindrical portion 121 (see FIG. 4). In the first embodiment, the slit 121a is formed in four places. In the center of the base plate portion 122, there is formed a hole through which the fixing rod 140 of the fixing means 140 passes, which will be described later.

2, 3, 5, and 6, the gap holding member 130 is a member that is sandwiched between the engaging rod 120 and the welding test piece 10 to maintain a gap therebetween, and the slit 121a To move along. The inner surface (the bottom surface 131 in FIG. 6) of the gap holding member 130 is in contact with the outer surface of the conical pressing portion of the fixing means 140 It forms an arc surface. The circular arc surface of the inner side surface 131 has a radius of curvature along the longitudinal direction in conformity with the outer surface of the cone of the pressing portion. The outer side surface 132 of the gap holding member 130 forms an arc surface of a curvature which is fitted to the inner surface of the tube ring 111 of the welded test piece 10.

The fixing means 140 fixes the welding test piece 10 by bringing the gap maintaining member 130 into close contact with the inner surface of the tube ring 111 of the welding test piece 10 and attaching the finishing plate 141, And includes a nut 143 and a pressing portion 144.

2 and 3, the finishing plate 141 is in close contact with the flange 111 of one side of the yoke 110 or the side surface of the end of the cylindrical portion 121 of the engaging rod 120. [ A hole through which the fixing rod 142 passes is formed at the center of the finishing plate 141. The fixing rod 142 is installed to penetrate the inside of the engaging rod 120 and threaded portions (right and left threads) in opposite directions to which the nuts 143 and 143 'are screwed are formed at both side ends of the pressing portion 144, And is tightened or loosened with a turret buckle. The pressing portion 144 is provided in the middle of the fixing rod 142 and the fixing rod 142 is fixed through the pressing portion 144 or the fixing rod 142 is fixed to both sides of the pressing portion 144 . The pressing portion 144 is conical and closely contacts the inner surface 131 of the gap holding member 130 to press the gap holding member 130 radially outward.

In the jig apparatus 100 for strength testing according to the first embodiment of the present invention configured as described above, as the nuts 143 and 143 'screwed to the fixing rod 142 are screwed and loosened, The gap holding member 130 is brought into close contact with the inner surface of the tube ring 111 of the welding test piece 10 to fix the welding test piece 10.

Fig. 7 is an explanatory view for explaining the operation of the jig apparatus 100 for strength testing. 7 shows a state in which the clamping means 140 is released and the gap holding member 130 is movable in the up and down direction before the welding test piece 10 is sandwiched and the test preparation is performed. (140) is tightened so that the gap holding member (130) fixes the welding test piece (10).

When the nuts 143 and 143 'of the fixing means 140 are loosened after the strength test, the gap holding member 130 is movable in the vertical direction so that the welding test piece 10 can be easily removed. The gap holding member 130 can be used in various sizes depending on the size (inner diameter) of the tube ring of the welded test piece. Therefore, it is possible to easily perform the test with the different size of the welding specimen, and the gap holding member 130 prevents the deformation and fracture of the tube ring 12 of the welded test piece 10, .

8 is a cross-sectional view showing a retaining bar of a jig device for strength testing according to a second embodiment of the present invention.

The engaging rod 220 of the jig apparatus for strength testing according to the second embodiment has a shape in which the concave and convex portions 223 are formed on the inner surface of the cylindrical portion. According to the concavo-convex structure of the second embodiment, the rigidity of the hollow engaging rod 220 is increased to reduce the weight of the jig device, and effectively prevent deformation of the engaging rod 220 at the time of the strength test (tensile test).

The protrusions 223 are formed in a plurality of strips along the inner surface length direction of the cylindrical portion of the stopper rod 220. In the present embodiment (Embodiment 2), protruding strips are formed in two lines between adjacent slots 121a to form irregularities 223. The remaining structure of the latching rods 220 is the same as that of the first embodiment shown in Figs. 3 and 4, and thus a detailed description thereof will be omitted.

Fig. 9 is a cross-sectional view showing a state in which a gap holding member of a jig device for strength testing according to a third embodiment of the present invention is coupled to a holding bar, and Fig. 10 is a perspective view showing the gap holding member of Fig.

The outer side portion 333 of the gap maintaining member 330 of the jig apparatus for strength testing of the third embodiment has a thickness that fits in the width of the slot 121a and the inner side portion 334 is formed to have a wider width than the slot, And is caught by the inner surface of the cylindrical portion 121 of the rod 120. The gap holding member 330 of the third embodiment is moved in the longitudinal direction of the engaging rod to be pulled out or fitted.

The gap holding member 330 of the third embodiment is not easily separated from the engagement rod 120 when it is sandwiched therebetween. Therefore, it is suitable for continuously testing welded test pieces of the same size. The remaining structure including the inner side surface 331 and the outer side surface 332 of the gap maintaining member 330 is similar to that of the first embodiment shown in Figs. 5 and 6, and thus a detailed description thereof will be omitted.

11 is a perspective view showing a gap holding member of a jig apparatus for strength testing according to a fourth embodiment of the present invention.

The gap holding member 430 of the jig apparatus for strength testing according to the fourth embodiment is detachably fitted on the upper surface of the body 435 and a body 435 fitted to the slit 121 of the engaging rod 120, 10 which are in contact with each other.

 The inner surface (bottom surface in FIG. 11, 435a) of the body 435 forms an arc surface that closely contacts the outer surface of the conical pressing portion 144 of the fixing means 140. The circular arc surface of the inner side surface 435a has a different radius of curvature along the longitudinal direction in conformity with the outer surface of the conical portion of the pressing portion 144. [

A dovetail 436a is formed on the bottom surface of the detachable piece 436 so as to fit into the dovetail groove 435b formed along the longitudinal direction on the upper surface of the body 435. The upper surface 436b of the detachable piece 436 is welded 10 of the outer circumferential surface of the tube ring 111. It is preferable that the width of the detachable piece 436 is larger than the width of the body 435.

The gap holding member 430 of the fourth embodiment can facilitate replacement of the gap holding member 430 when only the attaching / detaching member 436 is inserted while the body 435 is fitted in the engagement rod 120. The remaining configuration of the gap retaining member 430 is similar to that of the first embodiment shown in Figs. 5 and 6, and thus a detailed description thereof will be omitted.

12 is a photograph showing a state in which a jig device 1 and a welded test piece 2 of the comparative example for comparison with the embodiment of the present invention are mounted on a tensile tester and the tube ring 2b ) Is mounted on the latching rods of the jig device 1. As shown in Fig. 13 is a photograph showing a state in which the tube ring 2b of the welding test piece 2 mounted on the tensile testing machine of Fig. 12 is deformed and broken at the time of the tensile test.

When the jig device 100 for strength testing according to the embodiment of the present invention is used in comparison with the jig device 1 for strength testing of the comparative example, It is possible to obtain a precise strength test result by preventing the deformation and fracture of the ring 11 and to apply it to the welded test piece 10 having the tube rings 11 of various sizes, (See Figs. 1 to 7).

It will be apparent to those skilled in the art that various modifications and additions, additions, substitutions, and additions may be made to the components without departing from the spirit of the invention as set forth in the appended claims. It is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

10: welding test piece 11: tube ring
12: Stud
100: Jig device for strength test
110: yoke 111: yoke part
112: connecting rod 120, 220:
121: cylindrical portion 122: base plate portion
130, 230, 330, 430: spacing member 140:
141: Finishing plate 142: Fixing rod
143, 144 ': Nut 144:

Claims (5)

A jig device for strength testing for a strength test of a welded portion of a welded test piece in which a member is welded to the outer circumferential surface of a tube ring so as to protrude along a radial direction,
A yoke which is fixed and pulled on one side of the strength tester; a holding rod which is sandwiched between the yoke and the welding test piece is caught; a gap holding member which is sandwiched between the holding rod and the welding test piece to maintain a gap therebetween; And fixing means for fixing the welding test piece to the welding test piece,
Wherein the fixing means comprises a finishing plate which is closed at one side flange of the yoke or at a side face of the engaging rod and is finished, a fixing bar which is installed to penetrate the inside of the engaging rod, and a nut screwed to the fixing rod,
And a conical pressing portion for pressing the gap holding member is provided in the middle of the fixing rod,
Wherein the inner surface of the gap holding member is formed as an arc surface having a radius of curvature different from that of the outer surface of the conical pressing portion along the longitudinal direction,
Wherein the outer surface of the gap holding member is a circular arc surface having a curvature which is fitted to the inner surface of the tube ring of the welding test piece. The method according to claim 1,
And an uneven surface is formed on the inner surface of the latching bar. The method according to claim 1,
The gap holding member
A body fitted to the latching bar,
And a detachable piece which is detachably fitted to the body and is in close contact with the inner surface of the welding test piece. delete delete

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