Shear device and method for detecting magnetic pulse welding connector performance

[0034] Example one

[0035] A specific embodiment of the present invention, such as Figure 1 to Figure 3 As shown, a shearing device for testing the performance of magnetic pulse welding joints is disclosed, including a compression rod 1, a sample positioning piece 4, a compression block 5 and a base 6; the base 6 is used to fix the entire shearing device, the base 6 Compression block 5 and sample positioning sheet 4 are arranged from bottom to top, that is, the pressure block 5 is located above the base 6 and the sample positioning sheet 4 is located above the pressure block 5; the pressure block 5 is provided with a first aperture The sample positioning sheet 4 is provided with a second through hole with a second aperture, the first aperture is smaller than the second aperture, and the first through hole and the second through hole are arranged concentrically; the first aperture is larger than that of the inner tube 8 The outer diameter is smaller than the outer diameter of the outer tube 9; the rod diameter of the pressure rod 1 is smaller than the outer diameter of the inner tube 8 and larger than the inner diameter of the inner tube 8; the second aperture is larger than the outer diameter of the outer tube 9; the inner circumference of the pressure block 5 exceeds The part of the inner circumference of the sample positioning piece 4 is an annular shearing part; the pressing rod 1 acts on the inner tube 8, the shearing part acts on the outer tube 9, and the pressing rod 1 and the shearing part together complete the shearing of the welding sample slice 7 . Among them, the function of the shearing part is embodied in two aspects. On the one hand, it cooperates with the pressure bar 1 to shear and separate the welding sample slice 7; on the other hand, it is used to support the welding sample slice 7; the welding sample slice 7 is a cylindrical overall Shape, including inner tube 8 and outer tube 9. The inner tube 8 is fixed to the inner wall of the outer tube 9 by magnetic pulse welding. The inner tube 8 can be a tubular structure or a rod-shaped structure, such as Figure 4 to Figure 5 As shown, when the inner tube is a rod-shaped structure, the inner diameter of the inner tube is zero.

[0036] During the implementation, before the shearing experiment, fix the pressure block 5 and the sample positioning piece 4 on the base 6; place the welding sample slice 7 in the second through hole of the sample positioning piece 4, and weld the sample slice The outer tube 9 of 7 is placed on the annular shearing part, and the positioning block 2 is fixed by fixing bolts 3 or buckles or other methods. The pressing rod 1 is pressed into the welding sample slice 7 through the third through hole of the positioning block 2 Pipe fitting 8; put the entire shearing device on the electronic universal testing machine, start the electronic universal testing machine, the indenter of the electronic universal testing machine will directly apply the pressure on the pressure rod 1, when the pressure rod 1 and the shearing part will work together When the inner tube 8 and the outer tube 9 of the welded sample slice 7 fracture and separate, the electronic universal machine stops loading, and finally the shear strength and distribution characteristics of the welded joint area are obtained.

[0037] Compared with the prior art, the shearing device for detecting the performance of the magnetic pulse welding joint provided by this embodiment has simple structure and convenient installation and disassembly. The shearing device provided by this embodiment for detecting the performance of the magnetic pulse welding joint is used. It can test the overall shear strength of welded joints of pipe fittings, as well as the axial connection strength distribution of welded joints of pipe fittings. It has important scientific significance for the research of magnetic pulse welding experiment of pipe parts, which is helpful to the innovation and innovation of welding technology. development of. In addition, each part of the shearing device can be changed according to the specific size of the pipe welding joint, which can meet the detection of various types of pipe parts and has a wide range of versatility.

[0038] In this embodiment, the sample positioning sheet 4 and the pressure block 5 are fixed on the base. Preferably, the sample positioning sheet 4 and the pressure block 5 are fixed on the base by fixing bolts 3, and there are at least two fixing bolts 3, and It is symmetrically arranged on the base 6 to ensure that the center holes of the 4 sample positioning pieces and the 5 compression block are concentric. It can also be fixed by a buckle connection. Specifically, the compression block 5 is provided with a locking part, the base 6 is provided with a restricting part, and the locking part provided on the compression block 5 and the restricting part provided on the base 6 cooperate to Realize the fixation of the pressure block 5 and the base 6. Similarly, the sample positioning piece 4 is clamped on the pressure block 5, so that the sample positioning piece 4 and the pressure block 5 are fixed on the base. The above two kinds of fixed connection The methods are all detachable connection methods, and each part of the shearing device with detachable structure is an independent part, that is, between the pressure rod 1, the sample positioning piece 4, the pressure block 5 and the positioning block 3 of the shearing device They are independent components, which can be selected according to the specific size of the welded joints of the pipe fittings to be inspected, which can meet the inspection of various types of pipe parts and have wide versatility.

[0039] In order to avoid the loss of parts, one end of the sample positioning piece 4 and the pressure block 5 is set on the base 6 through a vertical rotating shaft, and the other end of the sample positioning piece 4 and the pressure block 5 is connected to the base 6 through a fixing bolt 3 It is fixed, so in the continuous experiment process, it is not necessary to disassemble all the parts, just unscrew the fixing bolt 3, and move the sample positioning piece 4 and the pressure block 5 along the vertical axis to realize the shearing device Quick disassembly. After replacing the welded joint, you only need to move the sample positioning piece 4 and the pressure block 5 along the vertical axis, and fix the other end of the sample positioning piece 4 and the pressure block 5 to the base 6 by the fixing bolt 3 , Convenient and fast, avoiding the loss of parts, shortening the experiment time and saving experiment costs. Further, in order to directly and closely contact the sample positioning piece 4, the pressure block 5 and the base 6 during the experiment, the vertical rotating shaft provided on the base 6 can move a certain distance in the vertical direction, such as screw tightening. The method of further tightening ensures the working reliability of the shearing device.

[0040] In order to improve the test accuracy and the reliability of the test device, the shearing device also includes a positioning block 2 for vertically limiting the pressure rod 1. The positioning block 2 is provided with a third through hole with a third aperture, and the third through hole is along the positioning block The third aperture is equal to the rod diameter of the pressure rod 1. The pressure rod 1 can be pressed against the welding sample slice 7 through the third through hole of the positioning block 2 and can move vertically up and down in the third through hole. It is ensured that the force of the pressure rod 1 acting on the welding sample slice 7 is uniform, thereby ensuring the test accuracy and the experimental results more reliable.

[0041] Considering that the positioning block 2 is used to vertically limit the pressure bar 1, it is only necessary to ensure that the positioning block remains relatively fixed on the plane. Therefore, the positioning block 2 can be installed in the following two ways. The first installation method is positioning block The size of 2 is the same as the size of the sample positioning piece 4, then the positioning block 2 is provided with a screw hole matching the fixing bolt 3. The positioning block 2 is fixedly connected to the sample positioning piece 4 or the base 6 through the fixing bolt 3. In one installation method, the bolt head of the fixing bolt 3 is pressed against the upper surface of the positioning block 2, and the positioning block 2 cannot move vertically during the test; in the second installation method, the size of the positioning block 2 is smaller than the sample positioning piece 4 The two ends of the positioning block 2 are symmetrically provided with semi-circular limit grooves, and the limit grooves are adapted to the shape of the bolt head of the fixing bolt 3. In the second installation method, part of the bolt head of the fixing bolt 3 is located in the positioning In the semicircular limit groove of block 2, the positioning block 2 is installed between the bolt heads of the two fixing bolts 3 to position the pressure rod 1 and limit the horizontal movement of the positioning block 2. When replacing the welding specimen At the same time, it can be directly removed from the top along the pressure rod 1. The second installation method is more convenient for installation and disassembly, while reducing the amount of material used and reducing production costs.

[0042] In order to improve the application versatility of the shearing device, the thickness of the sample positioning piece 4 is greater than or equal to the thickness of the welding sample slice 7 to ensure that the welding sample slice 7 is located in the central through hole of the sample positioning piece 4, that is, the welding sample The thickness of the slice 7 is smaller than the longitudinal height of the second through hole of the sample positioning sheet 4. Preferably, the thickness of the sample positioning sheet 4 can be adjusted according to the thickness of the welding sample slice 7. Specifically, the welding sample slice 7 is composed of multiple thin slices with the same structure, so that it can meet welding tests of different heights. The test requirements of sample slice 7 are more widely used.

[0043] In order to shorten the test time, the base 6 is a hollow cylinder as a whole, and a leakage hole is provided in the middle of the base 6 to leak the material to be sheared. The diameter of the leakage hole is larger than the first through hole of the pressure block 5. With the aperture, the compressed block 5 can be placed on the base 6. The shearing device of this structure can continuously perform multiple shearing experiments without repeatedly moving the base, thereby saving experimental testing time and improving test efficiency.

[0044] Example two

[0045] Another specific embodiment of the present invention discloses a method for detecting the performance of a magnetic pulse welded joint. Specifically, the shearing device for detecting the performance of a magnetic pulse welded joint in the first embodiment is used for the performance of the magnetic pulse welded joint. , Including the following steps:

[0046] Step 1: Before the shearing experiment, fix the pressure block 5 and the sample positioning sheet 4 on the base 6, and the sample positioning sheet 4 is located between the base 6 and the pressure block 5;

[0047] Step 2: Place the welding sample slice 7 in the second through hole of the sample positioning sheet 4, and place the outer tube 9 of the welding sample slice 7 on the annular shearing part, using other methods such as fixing bolts 3 or snaps Fix the positioning block 2 with at least two fixing bolts 3 and symmetrically arranged; the pressing rod 1 is pressed against the inner tube 8 of the welding sample slice 7 through the third through hole of the positioning block 2, and the pressing rod 1 can be Vertical movement in the third through hole of the positioning block 2;

[0048] Step 3: Put the entire shearing device on the electronic universal testing machine, start the electronic universal testing machine, the indenter of the electronic universal testing machine will directly act on the pressure bar 1, and the pressure bar 1 will transmit the pressure to the welding specimen slice 7. On the surface of the inner pipe 8, the pressure rod 1 pushes the inner pipe 8 to move downward, and the shearing part will hinder the downward movement of the outer pipe 9. The outer pipe 9 is always relatively static with respect to the pressure block 5, as the pressure rod 1 acts on the inside The pressure on the pipe 8 gradually increases. When the inner pipe 8 and the outer pipe 9 of the welded sample slice 7 are fractured and separated under the combined action of the pressure rod 1 and the shearing part, the electronic universal machine stops loading and finally obtains the welded joint area The shear strength and distribution characteristics.

[0049] In this embodiment, the parts of the shearing device used are independent of each other, that is, the pressure rod 1, the sample positioning piece 4, the pressure block 5 and the positioning block 3 are independent parts of each other, and the joints can be welded according to the pipe to be tested Select the corresponding parts for the specific size.