JPH04129588U - Spot welding strength confirmation device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a spot welding strength confirmation device with a simple structure and easy attachment and detachment of test pieces. [Configuration] Fixed gripping means Cf and movable gripping means C on the substrate 3
m, and the ends of two test pieces P welded together are brought into contact with the inclined gripping surfaces 18a of both gripping means Cm and Cf, and fixed with press bolts 19. Hydraulic cylinder 1
2, when the movable gripping means Cm is pushed in the direction away from the fixed gripping means Cf, the two test pieces P are pulled left and right and separated, and the hydraulic pressure acting on the hydraulic cylinder 12 at that time It is detected by the pressure gauge 17. By slanting the gripping surface 18a that grips the test piece P with respect to the pulling direction, even if the tightening force of the press bolt 19 is small, the test piece P can be reliably fixed against the pulling force. .

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention uses multiple pieces of welding to check whether spot welding is being performed normally. One end of the test piece is overlapped and spot welded, and the other end of the two A spot welding device that measures fracture strength by gripping and applying tensile force. Related to contact strength confirmation device.

0002

[Conventional technology]

For example, in automobile production lines, welding robots or stationary spot Welding of the car body is carried out using a welding machine, but the molten metal used for spot welding is The welding tip deteriorates with repeated use, reducing welding performance, so It is necessary to check the strength of the welded parts every time the welding of a number of car bodies is completed. For this reason Conventionally, spot welding strength has been confirmed using test pieces.

0003 In other words, as shown in Figures 4 and 5, the material and plate thickness are the same as the workpieces in mass production. A plurality of (for example, three) strip-shaped test pieces P having a Then, they are spot welded under the same conditions as during mass production. And said Tess After separating the top piece P by manually pulling it left and right, the diameter of the nugget at the welded part is When measured, if the nugget diameter exceeds the standard value, the welding strength of mass-produced products can be guaranteed. It was.

0004

[Problem that the idea aims to solve]

However, in the conventional manual method described above, the test piece is thin. Although it is possible to check the welding strength without spending a lot of effort, As the thickness of the test piece increases, it becomes difficult to separate the test piece manually. Moreover, indirect strength confirmation by measuring the nugget diameter does not reveal the actual fracture strength of the weld. There was a problem that I could not know.

[0005] For this purpose, the strength of the test piece was confirmed using an Amsler universal testing machine. However, the Amsler universal testing machine, which is a large and expensive multifunctional general-purpose machine, Installing one on each welding line is problematic in terms of cost and space. Or, it takes time to hold the test piece in the chuck, and the test cannot be completed in a short time. The problem is that it is difficult to

[0006] The present invention was developed in view of the above-mentioned circumstances. The purpose of the present invention is to provide a spot weld strength confirmation device that is easy to remove.

[0007]

[Means to solve the problem]

In order to achieve the above object, the present invention overlaps one end and spot welds the other. The two other ends of the plurality of test pieces are gripped by a pair of gripping means, and the The fracture strength of the welded part is measured by moving these gripping means relatively apart from each other using a driving source. A spot welding strength confirmation device configured to measure the strength of a spot weld, wherein each of the gripping means There is a gripping surface that forms an obtuse angle with the surface of the test piece, and the other end of the test piece is attached to this gripping surface. The first feature is that it has a pressing member that presses and fixes the parts.

[0008] In addition to the above-mentioned first feature, the present invention has a conical projection at the tip of the pressing member. An annular pressing surface surrounding the protrusion is provided, and a position corresponding to the protrusion on the gripping surface is provided. The second feature is that a recess is provided in the position.

[0009]

【Example】

Embodiments of the present invention will be described below based on the drawings.

0010 Figures 1 to 3 show one embodiment of the present invention, and Figure 1 shows the spot welding strength measurement. Figure 2 is a cross-sectional view taken along the line 2-2 in Figure 1, and Figure 3 is an enlarged view of the main parts of Figure 1. be.

[0011] The right half of the top surface of the board 3 supported via the buffer member 2 on the top of the pedestal 1 set up on the floor. A pair of guide rails 4 are laid along the longitudinal direction of the board 3. Ga A movable base 6 is slidably supported on the idle rail 4 via a linear block 5. , a bottom plate 7a, a pair of side plates 7b, a front plate 7c, a support plate 7d, and a reinforcing plate 7e are assembled. A holding means support part 7 which stands upright is provided. At the right end of the board 3, there is a A stopper 8 made of a contactable elastic material is provided via a bracket 9.

0012 On the left side of the top surface of the board 3 are a bottom plate 10a, a pair of side plates 10b, a front plate 10c, and A gripping means support part 10 is provided by assembling a support plate 10d, and a pair of side plates thereof A hydraulic cylinder 12 is supported between 10b via a bracket 11. hydraulic cylinder The conductor 12 penetrates the front plate 10c and extends to the right side, and its tip is implanted in the substrate 3. It is supported by the head of the support bolt 13. Not shown inside the hydraulic cylinder 12 A piston rod that protrudes to the right due to pressure oil supplied from a manual hydraulic pump. 14 slide together, and the tip thereof has an abutment that presses the front plate 7c of the right gripping means support part 7. Member 15 is attached. A pair of side plates 10e and a rear plate 10f are provided on the bottom plate 10a. After that, the backup bolt 16 screwed onto the plate 10f is inserted into the hydraulic cylinder 12. By bringing it into contact with the rear end, the reaction force acting on the hydraulic cylinder 12 is received. Ru. The hydraulic cylinder 12 is equipped with a needle-type pressure gauge 17, which is used as a test piece to be described later. The magnitude of the oil pressure when the spring P is separated is detected.

[0013] The test pieces P used in this device are aligned so that the two pieces are aligned in a straight line. The spot is overlapped at the end, and the spot plate P' is further overlapped on top of it. Welded. One test piece P is attached to the support plate 7d of one gripping means support part 7. A movable gripping means Cm for gripping the gripping portion Pc is provided, and the other gripping means support The support plate 10d of the holding part 10 has a support plate 10d for holding the holding part Pc of the other test piece P. A fixed gripping means Cf is provided. Both gripping means Cm and Cf have the same structure. and are arranged so as to face each other.

[0014] FIG. 3 shows the fixed gripping means Cf, which includes a gripping block fixed to the support plate 10d. A slit into which the gripping part Pc of the test piece P is inserted is formed in the hole 18. A gripping surface 18a for fixing the gripping portion Pc is formed on one wall surface of the slit. It will be done. A pressing member is inserted into the gripping block 18 from the opposite side of the gripping surface 18a. Press bolt 19 is screwed in. There is a conical projection 1 at the center of the tip of the pressing bolt 19. 9a, and an annular pressing surface 19b surrounding the outer periphery thereof. Also, the gripping tab The gripping surface 18a of the lock 18 has a conical shape corresponding to the protrusion 19a of the pressing bolt 19. A recess 18b is formed. As is clear from FIG. 1, the gripping block 18 The gripping surface 18a is inclined at an obtuse angle α with respect to the surface of the test piece P. is formed.

[0015] Since the structure of the movable gripping means Cm is the same as that of the fixed gripping means Cf, Duplicate explanations will be omitted.

[0016] Next, an embodiment of the above-mentioned present invention will be described.

[0017] Bend the gripping part Pc of the two test pieces P welded together, and Pc is inserted into the slits of the gripping blocks 18 of the movable gripping means Cm and the fixed gripping means cf. Insert each. Next, when the pressure bolt 19 is tightened, the circle formed at its tip The gripping portion Pc pressed by the conical projection 19a is slightly deformed and forms a recess in the gripping surface 18a. 18b, and the pressing surface 19b and gripping surface 18 around the protrusion 19a. The gripping portion Pc of the test piece P is clamped and fixed between the portions a.

[0018] In this way, the gripping portions Pc of the two test pieces P are moved by the movable gripping means Cm. After the piston rod is gripped by the fixed gripping means Cf, the hydraulic cylinder 12 is driven to remove the piston rod. 14, the front plate 7c is pressed by the abutting member 15 of the piston rod 14. The movable gripping means Cm moves away from the fixed gripping means Cf together with the movable base 6. As the two test pieces P move, they are pulled left and right and are broken at the welded portion Pw. At the same time as the welded part Pw of the test piece P breaks, the pressure of the hydraulic cylinder 12 causes the welded part Pw to break. The movable gripping means Cm pushed out in the direction prevents the movable base 6 from coming into contact with the stopper 8. It will stop due to Then, when the welded part Pw of the test piece P breaks, the hydraulic system The magnitude of the hydraulic pressure acting on the cylinder 12 is detected by a needle type pressure gauge 17. , The strength of the weld is confirmed by the detection results.

[0019] Now, as mentioned above, grip the test piece P with both gripping means Cm and Cf and pull it. When pulling the test piece P, hold it against the surface of the test piece Since the gripping surface 18a of the holding block 18 is inclined, the gripping portion P of the test piece P Even if the gripping force of c is small, it can sufficiently resist the pulling force, and by that much Both gripping means Cm and Cf can be made smaller and lighter.

[0020] In addition, the test was performed using the protrusion 19a of the pressing bolt 19 and the recess 18b of the gripping surface 18a. While slightly deforming the gripping portion Pc of the piece P, the pressing surface 1 of the pressing bolt 19 Since the gripping portion Pc is sandwiched and fixed between the gripping surface 9b and the gripping surface 18a, the above-mentioned tilting is avoided. Coupled with the effect of the slanted gripping surface 18a, the tip can be held with a slight tightening force of the pressing bolt 19. The stop piece P can be gripped reliably.

[0021] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments. There are various inventions without departing from the present invention as stated in the claims for utility model registration. It is possible to make small design changes.

[0022] For example, instead of the pressing bolt 19, a pressing member having the same tip shape can be used in the cylinder. The forward and backward movement may be driven by an actuator such as the above. It also drives the hydraulic cylinder 12. An electric hydraulic pump is used instead of a manual hydraulic pump as a source of hydraulic pressure for Also good.

[0023]

[Effect of the idea]

As described above, according to the first feature of the present invention, the gripping means faces the surface of the test piece. A gripping surface that forms an obtuse angle, and a pusher that presses and fixes the other end of the test piece to this gripping surface. Since it has a pressure member, it is possible to securely fix the test piece with a small gripping force. As a result, the gripping means can be made smaller and lighter, and the test piece can be gripped easily. It can be done quickly.

[0024] Further, according to the second feature of the present invention, a conical projection and the projection are provided at the tip of the pressing member. A surrounding annular pressing surface is provided, and a recess corresponding to the protrusion of the gripping surface is provided. Therefore, the test piece is partially deformed by the protrusion and recess, and the deformed part is The outer periphery of the handle can be clamped between the pressing surface and the gripping surface to ensure secure fixation.

[Brief explanation of drawings]

[Figure 1] Overall side view of spot welding strength confirmation device

[Figure 2] Cross-sectional view taken along line 2-2 in Figure 1

[Figure 3] Enlarged view of main parts of Figure 1

[Figure 4] Side view of conventional test piece

[Figure 5] Plan view of conventional test piece

[Explanation of symbols]

18a...Gripping surface 18b... recess 19... Pressing bolt (pressing member) 19a...Protrusion 19b...pressure surface Cf...Gripping means (fixed gripping means) Cm...gripping means (movable gripping means) P...Test piece

Claims (2)

[Scope of utility model registration request] Claim 1: A pair of gripping means (Cm, Cf) grips the two other ends of a plurality of test pieces (P) whose one ends are overlapped and spot welded, and the gripping means (Cm, Cf) ) is a spot welding strength confirmation device configured to measure the fracture strength of a weld by relatively moving the gripping means (C) away from each other using a drive source,
m, Cf) form an obtuse angle with respect to the surface of the test piece (P), and a pressing member (1) that presses and fixes the other end of the test piece (P) to this grip surface (18a).
9) A spot welding strength confirmation device comprising: 2. A conical projection (19a) and an annular pressing surface (19b) surrounding the projection (19a) are provided at the tip of the pressing member (19), and the projection (19a) of the gripping surface (18a) 2. The spot welding strength confirmation device according to claim 1, further comprising a recessed portion (18b) at a position corresponding to the spot welding strength confirmation device.