Magnesium alloy sheet plastic forming performance testing device

Abstract

The utility model discloses a magnesium alloy sheet plastic forming performance testing device which comprises a heating box, a punch, a descending plate, a sliding rod and a convex pressing plate, the punch is fixedly arranged at the inner bottom of the heating box and used for jacking a test piece, the sliding rod is arranged in the heating box and used for supporting the descending plate to ascend and descend, and the sliding rod is sleeved with a spring; the spring is located between the descending plate and the inner bottom of the heating box, the top of the descending plate is fixedly provided with a base plate for placing a test piece, the descending plate and the base plate are provided with through holes penetrating through the descending plate and the base plate, and the pressure plate is arranged in the heating box and located above the base plate. According to the application, the air cylinder is adopted to apply pressure, the pressure plate presses the test piece while applying pressure, the test piece can be fastened while applying pressure, so that the fastened test piece deforms, and the larger the pressure applying force is, the more stable the test piece is fastened, therefore, the test piece does not need to be fastened by a fastener, and the application is more convenient.

Description

Technical Field

[0001] The present application relates to the technical field of plastic forming of light alloy sheet materials, and particularly to a device for testing the plastic forming performance of magnesium alloy sheet materials. Background Art

[0002] The plastic forming performance of magnesium alloy sheet materials is the basis for determining the hot stamping forming process of magnesium alloys and determines the success or failure of their processing. In order to measure the hot stamping forming ability of different magnesium alloy materials, it is necessary to measure the plastic forming performance of magnesium alloy sheet materials. When magnesium alloy sheet materials are stamped and formed, the sheet materials need to be heated to a certain temperature (about 150 - 300 °C), so it is necessary to measure the plastic forming performance of magnesium alloy sheet materials at different temperatures, which is different from the methods and devices for measuring the plastic forming performance of forming materials under normal temperature conditions.

[0003] Existing plastic forming performance testing devices need fasteners such as bolts to fix the test pieces. When the temperature in the heating box is relatively high, it is not convenient to screw the bolts, so it is not conducive to use. Summary of the Invention

[0004] The purpose of the present application is to provide a device for testing the plastic forming performance of magnesium alloy sheet materials to solve the above problems. The pressure for testing is used to press and fasten the test piece synchronously. The greater the applied pressure, the more firmly the test piece will be fastened, and there is no need to screw bolts, making it more convenient to use.

[0005] The present application realizes the above purpose through the following technical solutions:

[0006] A device for testing the plastic forming performance of magnesium alloy sheet materials includes a heating box, a punch, a descending plate, a sliding rod, and a convex pressing plate. A punch is fixedly arranged at the bottom inside the heating box to jack up the test piece. The sliding rod is arranged inside the heating box to support the lifting of the descending plate. A spring is sleeved outside the sliding rod, and the spring is between the descending plate and the bottom inside the heating box. A cushion plate is fixedly arranged at the top of the descending plate for placing the test piece. Through holes are opened in the descending plate and the cushion plate to penetrate both of them. A pressing plate is arranged inside the heating box and is above the cushion plate. The bottom of the pressing plate is fixedly connected with a convex pressing plate. Deformation grooves are arranged on the pressing plate and the convex pressing plate to penetrate both of them, and the deformation grooves correspond to the spring. The pressing plate is connected with a driving component for driving its lifting.

[0007] Further, the driving component includes a linkage rod, a fixing plate, a bracket, and a cylinder. Linkage rods are fixedly connected to the four corners of the pressing plate. The linkage rods are arranged vertically. The linkage rods penetrate the top of the heating box and are fixedly connected with the fixing plate. The bracket is fixedly connected with the top of the heating box. The cylinder is fixedly installed on the bracket, and the telescopic end of the cylinder is fixedly connected with the fixing plate.

[0008] Further, a limit pad is fixedly connected to the top end of the sliding rod.

[0009] Further, the punch is vertically arranged, and the top end is hemispherical.

[0010] Further, there are two sliding rods, which are vertically arranged, and the bottom ends are fixedly connected to the heating box. The sliding rods penetrate through the descending plate, and the descending plate is slidably matched with the sliding rods.

[0011] Further, the aperture of the deformation groove gradually decreases so that the bulging part of the test piece can pass through.

[0012] Compared with the prior art, the present application uses a cylinder to apply pressure. While applying pressure, the pressing plate presses the test piece, which can apply pressure while fastening the test piece, so that the fastened test piece deforms. The greater the pressing force, the more stable the test piece is fastened. Therefore, there is no need to use fasteners to fasten the test piece, which is more convenient to use. Description of the Drawings

[0013] The drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present application, but do not constitute a limitation to the present application. In the drawings:

[0014] Figure 1 is a schematic structural diagram of the present application;

[0015] Figure 2 is a schematic diagram of the internal structure of the heating box of the present application;

[0016] Figure 3 is a schematic diagram of the deformation groove structure of the present application.

[0017] The description of the reference numerals in the drawings is as follows:

[0018] 1. Heating box; 2. Punch; 3. Descending plate; 4. Cushion plate; 5. Perforation; 6. Pressing plate; 7. Sliding rod; 8. Spring; 9. Limiting pad; 10. Convex pressing plate; 11. Deformation groove; 12. Linking rod; 13. Fixed plate; 14. Bracket; 15. Cylinder. Detailed Description of the Embodiments

[0019] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

[0020] In the description of the present application, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. are all based on the attached Figure 1, and only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operate in a specific orientation, and thus cannot be construed as a limitation on the present application.

[0021] As Figures 1-3 shown, a device for testing the plastic forming performance of a magnesium alloy sheet includes a heating box 1, a punch 2, a descending plate 3, a sliding rod 7, and a convex pressing plate 10. A punch 2 is fixedly arranged at the inner bottom of the heating box 1 for jacking up the specimen. The sliding rod 7 is arranged inside the heating box 1 to support the lifting and lowering of the descending plate 3. A spring 8 is sleeved outside the sliding rod 7, and the spring 8 is located between the descending plate 3 and the inner bottom of the heating box 1. A backing plate 4 for placing the specimen is fixedly arranged at the top of the descending plate 3. Through holes 5 penetrating both of them are formed in the descending plate 3 and the backing plate 4. A pressing plate 6 is arranged inside the heating box 1 and is located above the backing plate 4. A convex pressing plate 10 is fixedly connected to the bottom of the pressing plate 6. Deformation grooves 11 penetrating both of them are arranged on the pressing plate 6 and the convex pressing plate 10, and the deformation grooves 11 correspond to the spring 8. The pressing plate 6 is connected with a driving assembly for driving its lifting and lowering.

[0022] Specifically, drive the pressing plate 6 to descend, and then the convex pressing plate 10 descends. After contacting the specimen, continue to apply pressure and descend. The punch 2 releases the upward jacking of the specimen to cause bulging. When cracks occur in the magnesium alloy specimen or the test force suddenly drops, immediately stop the machine and record the movement stroke of the punch 2, that is, the bulging height of the magnesium alloy specimen. The descending plate 3 slides on the sliding rod 7 when descending to keep the lifting and lowering of the descending plate 3 stable by the sliding rod 7. At the same time, the descending plate 3 squeezes the spring 8 when descending. When the pressure applied by the convex pressing plate 10 is released, the spring 8 pushes the descending plate 3 back to its original position to facilitate placing the specimen on the backing plate 4.

[0023] Furthermore, the driving assembly includes a linkage rod 12, a fixing plate 13, a bracket 14, and a cylinder 15. Linkage rods 12 are fixedly connected to the four corners of the pressing plate 6. The linkage rods 12 are arranged vertically. The linkage rods 12 penetrate the top of the heating box 1 and are fixedly connected to the fixing plate 13. The bracket 14 is fixedly connected to the top of the heating box 1. The cylinder 15 is fixedly installed on the bracket 14. The telescopic end of the cylinder 15 is fixedly connected to the fixing plate 13.

[0024] Specifically, start the cylinder 15 to telescopically drive the fixing plate 13 to lift and lower. When the fixing plate 13 descends, it synchronously drives the linkage rods 12 to descend. Then the pressing plate 6 descends to make the convex pressing plate 10 follow and descend. Then the convex pressing plate 10 contacts the magnesium alloy specimen placed on the backing plate 4 to apply pressure to the specimen.

[0025] Furthermore, a limit pad 9 is fixedly connected to the top end of the sliding rod 7 for limiting.

[0026] Furthermore, the punch 2 is arranged vertically, and the top end is hemispherical for jacking up the specimen to cause bulging.

[0027] Further, there are two sliding rods 7. The two sliding rods 7 are arranged vertically, and the bottom ends are fixedly connected to the heating box 1. The sliding rods 7 penetrate through the descending plate 3, and the descending plate 3 is in sliding fit with the sliding rods 7. When the descending plate 3 descends, it slides on the two sliding rods 7 to keep the lifting of the descending plate 3 stable.

[0028] Further, the aperture of the deformation groove 11 gradually decreases so that the bulging part of the specimen can pass through.

[0029] In the above structure, the opening and closing heating box 1 can be used to place and take out the magnesium alloy material. Place the magnesium alloy sheet specimen on the backing plate 4, close the door of the heating box 1, and then start the heating box 1 to heat the magnesium alloy specimen inside. After heating, start the telescopic drive of the cylinder 15 to lift and lower the fixed plate 13. When the fixed plate 13 descends, it drives the linkage rod 12 to descend synchronously. Then the pressing plate 6 descends, causing the convex pressing plate 10 to follow and descend. Then the convex pressing plate 10 contacts the magnesium alloy specimen placed on the backing plate 4, continues to descend and press the backing plate 4, causing the backing plate 4 to descend along the sliding rod 7, so that the magnesium alloy specimen contacts the top of the punch 2. Continuing to descend, the magnesium alloy specimen undergoes pure bulging deformation under the action of the punch 2. When cracks occur in the magnesium alloy specimen or the test force suddenly drops, immediately stop the machine and record the moving stroke of the punch 2, that is, the bulging height of the magnesium alloy specimen. The magnitude of this height value reflects the plastic forming performance of the magnesium alloy sheet at the current temperature. After recording, start the contraction of the fixed plate 13. At this time, the descending plate 3 is reset under the action of the spring 8, and at the same time, the pressing plate 6 is driven by the linkage rod 12 to rise and reset, preparing for the next test. When it is necessary to determine the influence of the lubricant on the forming performance, the lubricant can be applied to the top of the punch 2 and the magnesium alloy specimen.

[0030] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present application. Without departing from the spirit and scope of the present application, the present application will have various changes and improvements, and these changes and improvements all fall within the scope of the present application claimed. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A magnesium alloy sheet plastic forming performance testing device, characterized in that: The invention comprises a heating box (1), a punch (2), a descending plate (3), a slide bar (7), and a convex pressure plate (10). The bottom of the heating box (1) is fixedly provided with a punch (2) for pushing up a test piece. The slide bar (7) is arranged in the heating box (1) for supporting the descending plate (3) to rise and fall. A spring (8) is sleeved on the outer side of the slide bar (7), and the spring (8) is located between the descending plate (3) and the bottom of the heating box (1). A pad (4) is fixedly provided on the top of the descending plate (3) for placing a test piece. The test piece comprises a descending plate (3) and a pad (4) each having a through hole (5) extending through the two. The pressure plate (6) is arranged in the heating box (1) and is located above the pad (4). The bottom of the pressure plate (6) is fixedly connected to a convex pressure plate (10). The pressure plate (6) and the convex pressure plate (10) are provided with a deformation groove (11) extending through the two. The deformation groove (11) corresponds to the spring (8). The pressure plate (6) is connected to a driving component for driving the pressure plate to rise and fall.

2. A magnesium alloy sheet material plastic forming performance testing device according to claim 1, characterized in that: The driving assembly comprises a linkage rod (12), a fixing plate (13), a bracket (14) and a cylinder (15). The four corners of the pressure plate (6) are fixedly connected to the linkage rods (12). The linkage rods (12) are arranged vertically. The linkage rods (12) pass through the top of the heating box (1) and are fixedly connected to the fixing plate (13). The bracket (14) is fixedly connected to the top of the heating box (1). The cylinder (15) is fixedly mounted on the bracket (14). The telescopic end of the cylinder (15) is fixedly connected to the fixing plate (13).

3. The magnesium alloy sheet material plastic forming performance testing device according to claim 1, characterized in that: The top end of the slide bar (7) is fixedly connected to a limit pad (9).

4. The magnesium alloy sheet material plastic forming performance testing device according to claim 1, characterized in that: The punch (2) is arranged vertically and has a hemispherical top.

5. The magnesium alloy sheet material plastic forming performance testing device according to claim 1, characterized in that: There are two slide bars (7), which are arranged vertically and have bottom ends fixedly connected to the heating box (1). The slide bars (7) penetrate the descending plate (3), and the descending plate (3) and the slide bars (7) are slidably matched.

6. The magnesium alloy sheet material plastic forming performance testing device according to claim 1, characterized in that: The aperture of the deformation groove (11) is gradually reduced so as to allow the bulged portion of the test piece to pass through.

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