CN206353101U - A kind of universal fixturing of material tensile test - Google Patents

Abstract

The utility model discloses a general fixture for material tensile test, which comprises a test piece and two oppositely arranged clamping mechanisms. The clamping mechanism comprises a clamping piece, a positioning load-bearing block, a locking screw, and an outer ring. The clamping piece is threaded on one side of the outer ring, and the positioning load-bearing block is fixed in the inner cavity of the outer ring with locking screws. The positioning load-bearing block is penetrated with a cross groove, and the middle part of the cross groove is provided with a circular through hole. The horizontal grooves in the cross grooves are straight through grooves, the longitudinal grooves in the cross grooves are V-shaped grooves, the two ends of the test piece are respectively inserted into the two horizontal grooves of the cross grooves of the positioning load-bearing block, and after rotating 90 degrees, The side of the test piece fits with the inner wall of the V-shaped groove in the positioning load-bearing block. The utility model has a cross groove through the positioning load-bearing block, through the cooperation of the straight groove of the cross groove and the V-shaped groove, the fixation of the test piece is realized, and the experimental method of clamping by friction force is changed, and the structure is simple and compact, and the manufacturing It has the advantages of simple process, low cost, etc., and has a wide range of applications.

Description

A Universal Fixture for Material Tensile Test

technical field

The utility model relates to a clamp, in particular to a universal clamp for material tensile test.

Background technique

Tensile test is a common technical method for new material preparation and material performance inspection. The data obtained by tensile test can be used to determine the tensile strength, elongation, area reduction, yield strength and other tensile performance indicators of the material. Commonly, for the tensile test of metal materials, the vise-type chucks of the hydraulic tensioning machine are generally used to clamp the two ends of the specimen through friction. increases, the clamping force increases accordingly. For the wedge-shaped grip, the friction between the sample surface and the grip is used as the clamping force, the initial clamping force is small, and the clamping force gradually increases with the increase of the test force. These two methods are easy to operate and low in cost, but there are also some problems. For example, if the clamping force is too large during the stretching process, the end of the specimen may be easily broken; Slippage and scratches on the surface of the sample will easily lead to the scrapping of the sample, requiring repeated clamping, resulting in increased cost of the test, low test efficiency, and affect the accuracy of the test data.

Contents of the invention

In order to solve the above-mentioned technical problems, the utility model provides a universal jig for tensile testing of materials with simple structure and low cost.

The technical solution of the utility model to solve the above-mentioned problems is: a general fixture for material tensile test, including a test piece and two oppositely arranged clamping mechanisms, the clamping mechanism includes a clamping piece, a positioning load-bearing block, a lock Tighten the screw and the outer ring, the clamping piece is threaded on one side of the outer ring, the positioning load-bearing block is fixed in the inner cavity of the outer ring with locking screws, the positioning load-bearing block is penetrated with a cross groove, and the middle part of the cross groove is set There are circular through holes, the horizontal grooves in the cross grooves are straight through grooves, the vertical grooves in the cross grooves are V-shaped grooves, and the two ends of the test piece are respectively inserted into the horizontal grooves of the cross grooves of the two positioning load-bearing blocks. , after rotating 90 degrees, the side of the test piece fits with the inner wall of the V-shaped groove in the positioning load-bearing block.

In the general fixture for the tensile test of the above materials, the outer surface of the fixture is provided with diamond-shaped knurling.

The general fixture for the tensile test of the above materials, the other side of the outer ring is provided with an annular sealing plate, and the sealing plate is symmetrically provided with two screw holes for passing through the fastening screws and two for positioning the top of the load-bearing block. The through hole of the outer ring.

In the general fixture for the tensile test of the above-mentioned materials, the groove width of the through groove is greater than the thickness of the test piece.

In the general fixture for the tensile test of the above materials, the included angle of the V-shaped groove is equal to the included angle of the side of the test piece, and the diameter of the bottom of the V-shaped groove is greater than or equal to the width of the tested part of the tested piece.

The general fixture for the tensile test of the above-mentioned materials, the test piece is flat and has two large ends and a small middle.

The beneficial effect of the utility model is that: the utility model has a cross groove through the positioning load-bearing block, and the fixation of the test piece is realized through the cooperation of the straight groove of the cross groove and the V-shaped groove, which changes the experimental method of clamping by friction force. The method has the advantages of simple and compact structure, simple manufacturing process, low cost, etc., and has a wide range of applications.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the utility model.

Figure 2 is an exploded view of Figure 1.

Figure 3 is a schematic diagram of the structure of the test piece in Figure 2.

FIG. 4 is a schematic structural diagram of the clamping member in FIG. 2 .

Fig. 5 is a structural schematic diagram of the positioning load-bearing block in Fig. 2 .

Fig. 6 is a front view of Fig. 5 .

FIG. 7 is a cross-sectional view of FIG. 5 .

FIG. 8 is a schematic structural diagram of the outer ring in FIG. 2 .

detailed description

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

As shown in Figures 2-8, the utility model includes a test piece 5 and two opposite clamping mechanisms 11. The clamping mechanism 11 includes a clamping piece 1, a positioning load-bearing block 2, and an outer ring 4. The clamping part 1 is threaded on one side of the outer ring 4, and the outer surface of the clamping part 1 is provided with diamond-shaped knurling to improve the clamping friction; the other side of the outer ring 4 is provided with an annular sealing plate 6, the sealing plate Two screw holes 42 and two through holes 41 are arranged symmetrically on the upper side. The two through holes 41 are used to pass through the locking screws 3 to fix the positioning load-bearing block 2 on the outer ring 4. The two screw holes 42 are used to replace the positioning When the load-bearing block 2 is used, the positioning load-bearing block 2 is pushed out of the outer ring 4, and the positioning load-bearing block 2 is designed to be replaceable through the screw hole 42 and the through hole 41. The three parameters of part width C and clamping end width A can be replaced with different types of positioning load-bearing blocks 2 within a certain range, so as to improve the versatility of the fixture. The positioning load-bearing block 2 is fixed in the inner cavity of the outer ring 4 with locking screws 3, the positioning load-bearing block 2 is penetrated with a cross groove 7, and the middle part of the cross groove 7 is provided with a circular through hole 8. In the cross groove 7 The horizontal groove of the cross groove is a straight-through groove, and the groove width of the straight-through groove is slightly larger than the thickness of the test piece 5. The vertical groove in the cross groove 7 is a V-shaped groove, and the included angle β of the V-shaped groove is equal to the included angle α of the side surface of the tested piece 5, V The diameter c of the groove bottom is greater than or equal to the width C of the tested part of the test piece 5. The test piece 5 is flat with two ends large and the middle small. The two ends of the test piece 5 are respectively inserted into two positioning load-bearing blocks 2 cross grooves In the transverse groove of 7, after rotating 90 degrees, the side of the test piece 5 fits with the inner wall of the V-shaped groove in the positioning load-bearing block 2.

The working principle of the utility model is as follows: fix the positioning load-bearing block 2 on the outer ring 4, screw the clamping part 1 into the outer ring 4, and then insert one end of the test piece 5 into the straight-through groove of the cross groove 7 of the positioning load-bearing block 2 Then rotate 90 degrees, pull down the test piece 5, fit the angled surface of the side of the test piece 5 with the inner wall of the V-shaped groove in the positioning load-bearing block 2, and fix the other end of the test piece 5 with the same steps , the preparatory work for the material stretching experiment was completed, and the clamping part 1 was clamped with the vise of the material stretching hydraulic machine to realize the material stretching experiment. Different types of positioning load-bearing blocks 2 can be replaced within a certain range according to three parameters such as the included angle α of the side of the test piece 5, the width C of the tested part of the test piece 5, and the width A of the clamping end.

Claims (6)

1. a kind of universal fixturing of material tensile test, it is characterised in that：Including by test specimen and two clamping machines being oppositely arranged Structure, the clamp system includes holder, positioning bearing block, lock-screw, outer shroud, and the holder is threaded in outer shroud one Side, the positioning bearing block is fixed in outer shroud inner chamber with lock-screw, and cross recess is through with positioning bearing block, cross recess The translot that middle part is provided with manhole, the cross recess is that the pod in direct through groove, cross recess is V-shaped groove, described by test specimen Two ends insert respectively two positioning bearing block cross recess translots in, after being rotated by 90 °, by test specimen side and positioning bearing block Interior V-shaped groove inwall fits.

2. the universal fixturing of material tensile test according to claim 1, it is characterised in that：The holder outer surface is set There is diamond-shaped knurling.

3. the universal fixturing of material tensile test according to claim 1, it is characterised in that：The outer shroud opposite side is provided with Two are arranged with ring sealing plate, shrouding is used for through the screw of trip bolt and 2 for positioning bearing block ejection is outer The through hole of ring.

4. the universal fixturing of material tensile test according to claim 1, it is characterised in that：The groove width of the direct through groove is big In by specimen thickness.

5. the universal fixturing of material tensile test according to claim 1, it is characterised in that：Angle of the V-shaped groove etc. In by test specimen side angle, V-groove groover rot diameter is more than or equal to by test specimen subject position width.

6. the universal fixturing of material tensile test according to claim 1, it is characterised in that：Institute by test specimen in flat and The big centre in two is small.