Metal plate forming testing machine

Abstract

The utility model belongs to the technical field of metal plate forming experiments, and particularly relates to a metal plate forming testing machine which comprises a forming testing machine operation bottom table, a supporting frame is connected to the top of the forming testing machine operation bottom table in a welded mode, and a metal plate limiting assembly is installed on the side of the supporting frame. A metal plate pressing and bending assembly is installed on the inner wall of the supporting frame, a first supporting table is fixedly connected to one end of the forming testing machine operation bottom table, a first rotating shaft is fixedly connected to the top end of the first supporting table, and a rotating carrier roller is rotationally connected to the outer portion of the first rotating shaft; sliding friction force is converted into rolling friction force, the friction force between a metal plate and a bottom cushion block in the downward bending forming process of the metal plate is conveniently reduced, meanwhile, the metal plate limiting assembly is arranged, it is conveniently guaranteed that the middle position of the metal plate right faces the spherical punch in the experiment process, and the experiment efficiency is improved. And uniform stress during downward bending forming is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of metal plate forming experiments, in particular to a metal plate forming testing machine. Background Art

[0002] The sheet forming testing machine is a testing machine specially used to identify and distinguish the plastic forming (stamping) performance of metal sheets. It is a powerful tool for controlling the rolling quality of sheets and rationally selecting stamping sheets.

[0003] In Chinese Patent 202121620965.2, the utility model belongs to the field of ductility testing of sheet materials, and specifically discloses a sheet forming test machine mold, including a spherical punch, a pressing mold, a cushion mold and an oil cylinder, wherein a first through hole and a second through hole are provided in the cushion mold, the spherical punch is provided in the first through hole, a movable connecting shaft is provided in the second through hole, the connecting shaft is sealed and connected to the second through hole, one end of the connecting shaft is connected to the spherical punch, and the other end of the connecting shaft is connected to the oil cylinder; a third through hole is provided on the surface of the spherical punch that penetrates the spherical punch, and a lubricant is stored in the first through hole, and the lubricant submerges the spherical punch. With the utility model, the spherical punch can be automatically coated with lubricant to improve the test efficiency of the sheet material.

[0004] The existing metal sheet forming test machine has the problem that when the metal sheet is subjected to a bending test, the friction between the bottom of the sheet and the bottom pad will be very large because the middle of the sheet needs to be pressed downward by gravity. This results in the metal sheet requiring more pressure to be bent downward due to the large friction. In addition, when the metal sheet is bent and formed, the metal sheet may not be aligned directly below the spherical punch (406), and the uneven force during pressing may affect the experiment.

[0005] Therefore, a metal sheet forming testing machine is proposed to solve the above problems. Utility Model Content

[0006] In order to make up for the shortcomings of the existing technology, the problem that when the existing metal sheet forming test machine performs a bending test on the metal sheet, the friction between the bottom of the sheet and the bottom pad will be very large because the middle position of the sheet needs to be pressed downward by gravity, which results in the metal sheet needing to consume more pressure when bending downward due to the large friction, and when the metal plate is bent and formed, the metal sheet may not be aligned with the bottom of the spherical punch (406), and the uneven force during pressing may affect the experiment.

[0007] The technical solution adopted by the utility model to solve the technical problem is as follows: the metal sheet forming test machine described in the utility model comprises an operating base of the forming test machine, the top of the operating base of the forming test machine is welded to a support frame, and a metal sheet limiting assembly is installed on the side of the support frame, and a metal sheet pressing and bending assembly is installed on the inner wall of the support frame, one end of the operating base of the forming test machine is fixedly connected to a first support platform, and the top of the first support platform is fixedly connected to a first rotating shaft, and the outer side of the first rotating shaft is rotatably connected to a rotating roller, and the forming test The other end of the machine operating base is fixedly connected to a second support platform, and an observation component is installed on the top of the second support platform. The rotating roller forms a rotating structure with the first support platform through a first rotating shaft, and two rotating rollers are symmetrically arranged about the vertical center axis of the support frame. The metal plate limiting component includes a limiting push rod, a limiting push block, a limiting hole, a limiting nail, and a supporting block. The end of the limiting push rod is integrally connected to the limiting push block, and a limiting hole is opened inside the limiting push rod. The limiting nail passes through the inside of the limiting hole, and the top of the limiting nail is engaged and connected with the supporting block.

[0008] Preferably, the limiting pins, the supporting blocks and the limiting holes all form a snap-fitting structure, and the supporting blocks and the supporting frame are integrated, the limiting holes are arranged at equal intervals inside the limiting push rod, and the limiting push rod and the supporting frame form a sliding structure, and two limiting push rods are symmetrically arranged about the vertical center axis of the support frame.

[0009] Preferably, the metal sheet press-down bending assembly includes a hydraulic cylinder, a cylinder push rod, a fixed threaded groove, a fixed nut, a fixed threaded protrusion, and a spherical punch. The bottom end of the hydraulic cylinder is equipped with a cylinder push rod, and the bottom end of the cylinder push rod is fixedly connected to the fixed threaded groove, and the external thread of the fixed threaded groove is connected to the fixing nut, the internal snap-fit ​​connection of the fixed threaded groove is connected to the fixed threaded protrusion, and the bottom end of the fixed threaded protrusion is fixedly connected to the spherical punch.

[0010] Preferably, the spherical punch forms a detachable structure through a fixed threaded protrusion, a fixed threaded groove and a cylinder push rod, and the spherical punch forms a lifting structure through a hydraulic cylinder, a cylinder push rod and a support frame, and the vertical center axis of the spherical punch and the vertical center axis of the support frame are arranged to coincide.

[0011] Preferably, the observation assembly includes a magnifying glass, a handle, a second rotating shaft, a spring, a support rod, a third rotating shaft, and a rotating roller. The side of the magnifying glass is fixedly connected to the handle, and the end of the handle is rotatably connected to the second rotating shaft, and the bottom of the handle is fixedly connected to the spring, the top of the magnifying glass is fixedly connected to the support rod, and the top end of the support rod is fixedly connected to the third rotating shaft, and the outside of the third rotating shaft is rotatably connected to the rotating roller.

[0012] Preferably, the rotating roller forms a rotating structure with the support rod through the third rotating shaft, and the support rod and the magnifying glass are vertically arranged, the handle forms an elastic structure with the second support platform through a spring, and the handle forms a rotating structure with the second support platform through the third rotating shaft.

[0013] The utility model is beneficial in that:

[0014] 1. The utility model is provided with a rotating roller, which can be rotated by a first rotating shaft to support the metal sheet. When the middle position of the metal sheet is bent downward, the bottoms of both sides thereof need to slide downward. When the bottom of the metal sheet slides on the rotating roller, it can rotate with the rotating roller, thereby converting the sliding friction between the rotating rollers into a rotating friction, thereby reducing the friction between the metal sheet and the testing machine when bending downward, so as to improve the bending forming efficiency of the metal sheet;

[0015] 2. The utility model is provided with a metal sheet limiting assembly, which uses two slidably adjustable limiting push rods to limit the position of the metal sheet, so that the metal sheet can be adjusted to face the bottom of the spherical punch, so that when the spherical punch presses the metal sheet downward, the middle position of the metal sheet is pressed, so as to prevent the metal sheet from being subjected to uneven force and affecting the experimental results of bending forming;

[0016] 3. The utility model is provided with a metal sheet pressing and bending assembly, which is driven by a hydraulic cylinder and a cylinder push rod to facilitate the downward movement of the spherical punch, thereby facilitating the pressing of the metal sheet at the bottom to bend it, and the spherical punch is fixed by the cooperation of a fixed thread groove, a fixed nut and a fixed thread protrusion, and can be disassembled and assembled by simply twisting the fixed nut, with a simple structure and convenient operation;

[0017] 4. The utility model is provided with an observation component. When the metal plate under experiment is bent, the magnifying glass will also rotate and rise along with the raised metal plate, thereby facilitating the magnification of the side surface of the metal plate. When cracks appear, the cracks can be magnified, so that the experimenter can observe the cracks appearing on the surface of the metal plate in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1It is a schematic diagram of the three-dimensional structure of the utility model as a whole from the side;

[0020] Figure 2 It is a three-dimensional structural schematic diagram of the metal plate limiting component part of the utility model;

[0021] Figure 3 It is a schematic diagram of the exploded structure of the metal sheet press-down bending component of the utility model;

[0022] Figure 4 It is a three-dimensional structural schematic diagram of the observation component part of the utility model;

[0023] Figure 5 for Figure 4 Schematic diagram of the enlarged structure at point A in the middle.

[0024] In the figure: 1. forming test machine operating base; 2. supporting frame; 3. metal sheet limiting assembly; 4. metal sheet pressing and bending assembly; 5. first supporting platform; 6. first rotating shaft; 7. rotating roller; 8. second supporting platform; 9. observation assembly; 301. limiting push rod; 302. limiting push block; 303. limiting hole; 304. limiting pin; 305. supporting block; 401. hydraulic cylinder; 402. cylinder push rod; 403. fixed thread groove; 404. fixed nut; 405. fixed thread protrusion; 406. spherical punch; 901. magnifying glass; 902. handle; 903. second rotating shaft; 904. spring; 905. support rod; 906. third rotating shaft; 907. rotating roller. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Embodiment 1

[0027] See also Figure 1As shown, a metal sheet forming test machine comprises a forming test machine operating base 1, a supporting frame 2 is welded on the top of the forming test machine operating base 1, a metal sheet limiting assembly 3 is installed on the side of the supporting frame 2, and a metal sheet pressing and bending assembly 4 is installed on the inner wall of the supporting frame 2, one end of the forming test machine operating base 1 is fixedly connected to a first supporting platform 5, and the top of the first supporting platform 5 is fixedly connected to a first rotating shaft 6, and the outer part of the first rotating shaft 6 is rotatably connected to a rotating roller 7, the other end of the forming test machine operating base 1 is fixedly connected to a second supporting platform 8, and an observation assembly 9 is installed on the top of the second supporting platform 8, The rotating roller 7 forms a rotating structure with the first rotating shaft 6 and the first supporting platform 5, and two rotating rollers 7 are symmetrically arranged about the vertical center axis of the supporting frame 2. The rotating rollers 7 that can be rotated through the first rotating shaft 6 are used to support the metal sheet. When the middle position of the metal sheet is bent downward, the bottoms on both sides need to slide downward. When the bottom of the metal sheet slides on the rotating rollers 7, it can rotate with the rotating rollers 7, and then convert the sliding friction between the rotating rollers 7 into rotational friction, thereby reducing the friction between the metal sheet and the testing machine when bending downward, so as to improve the bending forming efficiency of the metal sheet.

[0028] See also Figure 2 As shown, a metal sheet forming testing machine is provided, wherein the metal sheet limiting assembly 3 is used to make the metal sheet face the spherical punch 406 during the experiment, the limiting nail 304 and the supporting block 305 and the limiting hole 303 all constitute a snap-fit ​​structure, and the supporting block 305 and the supporting frame 2 are integrated, the limiting holes 303 are arranged at equal intervals inside the limiting push rod 301, and the limiting push rod 301 and the supporting frame 2 constitute a sliding structure, and two limiting push rods 301 are symmetrically arranged about the vertical center axis of the supporting frame 2, and the two slidably adjustable limiting push rods 301 are used to limit the position of the metal sheet, and to adjust the metal sheet to face the bottom of the spherical punch 406, so that when the spherical punch 406 presses the metal sheet downward, the middle position of the metal sheet is pressed, so as to prevent the metal sheet from being subjected to uneven force and affecting the experimental results of bending forming.

[0029] See also Figure 3As shown, a metal sheet forming test machine, a metal sheet pressing and bending assembly 4 is used to press the metal sheet, a cylinder push rod 402 is installed at the bottom end of the hydraulic cylinder 401, and the bottom end of the cylinder push rod 402 is fixedly connected with a fixed thread groove 403, and the external thread of the fixed thread groove 403 is connected with a fixed nut 404, the internal snap connection of the fixed thread groove 403 is connected with a fixed thread protrusion 405, and the bottom end of the fixed thread protrusion 405 is fixedly connected with a spherical punch 406, and the spherical punch 406 forms a detachable structure through the fixed thread protrusion 405, the fixed thread groove 403 and the cylinder push rod 402 The spherical punch 406 forms a lifting structure with the support frame 2 through the hydraulic cylinder 401 and the cylinder push rod 402, and the vertical center axis of the spherical punch 406 is coincident with the vertical center axis of the support frame 2. Driven by the hydraulic cylinder 401 and the cylinder push rod 402, it is convenient to move the spherical punch 406 downward, and then it is convenient to press the metal sheet at the bottom to make it bend. The spherical punch 406 is fixed by the fixed thread groove 403, the fixed nut 404, and the fixed thread protrusion 405. Only by twisting the fixed nut 404, it can be disassembled and installed. The structure is simple and the operation is convenient.

[0030] See also Figure 4 and Figure 5 As shown, a metal sheet forming test machine, the observation component 9 is used to magnify the cracks on the side of the metal sheet, the side of the magnifying glass 901 is fixedly connected to a handle 902, and the end of the handle 902 is rotatably connected to a second rotating shaft 903, and the bottom of the handle 902 is fixedly connected to a spring 904, the top of the magnifying glass 901 is fixedly connected to a support rod 905, and the top of the support rod 905 is fixedly connected to a third rotating shaft 906, and the outside of the third rotating shaft 906 is rotatably connected to a rotating roller 907, and the rotating roller 907 is rotated by the third rotating shaft 906 and the support rod 905 form a rotating structure, and the support rod 905 and the magnifying glass 901 are vertically arranged, the handle 902 forms an elastic structure with the second support platform 8 through the spring 904, and the handle 902 forms a rotating structure with the second support platform 8 through the third rotating shaft 906. When the metal sheet being tested is bent, the magnifying glass 901 will also rotate and rise with the raised metal sheet, thereby facilitating the magnification of the side surface of the metal sheet. When cracks appear, it is convenient to magnify the cracks, so that the experimenter can observe the cracks on the surface of the metal sheet in time.

[0031] Working principle: First, place the metal sheet to be formed and tested flat on the two rotating rollers 7, and slide the two limit push rods 301 to the middle position at the same time, until the limit push block 302 at the end of the limit push rod 301 is close to the side of the sheet, and the lengths of the two limit push rods 301 can be compared according to the number of limit holes 303 extending out of the support frame 2 to see if they are the same. If they are different, they can be slid and adjusted, and the position of the metal sheet can also be adjusted to make the distance between the metal sheet and the two sides of the support frame 2 equal. Then, the limit nails 304 are inserted into the limit holes 303 corresponding to the bottom of the support block 305, so that the limit push rods 301 can be limited and fixed;

[0032] Then the hydraulic cylinder 401 is started, and the hydraulic cylinder 401 drives the cylinder push rod 402 to push downward, and then the spherical punch 406 moves downward to press the metal plate facing its bottom. After the middle position of the metal plate is subjected to force, it will bend downward. While bending downward, the two sides of the metal plate need to move downward, and then the bottom walls on both sides will slide toward the middle position on the rotating roller 7. At the same time, the rotating roller 7 can be rotated toward the middle position under the force, thereby reducing the friction between the bottom wall of the metal plate and the rotating roller 7. When the middle position of the metal plate bends downward, its two sides will slowly tilt upward. When its sides tilt upward, the magnifying glass 901 will move along with the metal plate under the elastic force of the spring 904. The raised side of the metal sheet rotates upward, and the rotating roller 907 is attached to the side of the metal sheet and rotates. The support rod 905 supports the magnifying glass 901 to keep a certain distance from the metal sheet. When the spherical punch 406 moves downward continuously and the metal sheet is bent toward the middle continuously, the experimenter can observe in real time through the magnifying glass 901 whether there are cracks on the outer wall of the metal sheet. When cracks appear on the side, the hydraulic cylinder 401 is closed, and then the metal sheet is removed from the test machine, and its thickness and the fillet radius after bending are measured. The minimum relative bending radius can be obtained by dividing the minimum fillet radius of the metal sheet by the thickness of the sheet, and the minimum bending radius is used to represent the bending performance of the metal sheet.

[0033] When it is necessary to bend to a different angle and replace the spherical punch (406), the fixing nut (404) only needs to be rotated upwards to disengage the inner wall of the fixing nut (404) from the contact position between the fixing thread groove (403) and the fixing thread protrusion (405). After the outer walls of the fixing thread groove (403) and the fixing thread protrusion (405) are disengaged from the limitation of the fixing nut (404), the fixing thread protrusion (405) and the spherical punch (406) can be removed and replaced.

[0034] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A metal sheet forming testing machine, characterized in that: The molding test machine comprises an operating base (1), the top of the molding test machine operating base (1) is welded to a support frame (2), the side of the support frame (2) is installed with a metal plate limit assembly (3), and the inner wall of the support frame (2) is installed with a metal plate downward bending assembly (4), one end of the molding test machine operating base (1) is fixedly connected to a first support platform (5), the top of the first support platform (5) is fixedly connected to a first rotating shaft (6), and the outside of the first rotating shaft (6) is rotatably connected to a rotating roller (7), the other end of the molding test machine operating base (1) is fixedly connected to a second support platform (8), and the top of the second support platform (8) is installed with an observation assembly (9); The rotating roller (7) forms a rotating structure with the first supporting platform (5) through the first rotating shaft (6), and two rotating rollers (7) are symmetrically arranged about the vertical center axis of the supporting frame (2); The metal plate limiting assembly (3) comprises a limiting push rod (301), a limiting push block (302), a limiting hole (303), a limiting pin (304), and a supporting block (305); the end of the limiting push rod (301) is integrally connected to the limiting push block (302), and the limiting hole (303) is provided inside the limiting push rod (301); the limiting pin (304) passes through the inside of the limiting hole (303), and the top end of the limiting pin (304) is snap-connected with the supporting block (305).

2. A metal sheet forming testing machine according to claim 1, characterized in that: The limiting pin (304) and the supporting block (305) and the limiting hole (303) all form a snap-fit ​​structure, and the supporting block (305) and the supporting frame (2) are integrated, the limiting holes (303) are arranged at equal intervals inside the limiting push rod (301), and the limiting push rod (301) and the supporting frame (2) form a sliding structure, and two limiting push rods (301) are symmetrically arranged about the vertical center axis of the supporting frame (2).

3. A metal sheet forming testing machine according to claim 1, characterized in that: The metal sheet press-down bending assembly (4) comprises a hydraulic cylinder (401), a cylinder push rod (402), a fixed thread groove (403), a fixed nut (404), a fixed thread protrusion (405), and a spherical punch (406). The bottom end of the hydraulic cylinder (401) is equipped with a cylinder push rod (402), and the bottom end of the cylinder push rod (402) is fixedly connected to the fixed thread groove (403), and the external thread of the fixed thread groove (403) is connected to the fixed nut (404), the inside of the fixed thread groove (403) is snap-fitted and connected to the fixed thread protrusion (405), and the bottom end of the fixed thread protrusion (405) is fixedly connected to the spherical punch (406).

4. A metal sheet forming testing machine according to claim 3, characterized in that: The spherical punch (406) forms a detachable structure through a fixed threaded protrusion (405), a fixed threaded groove (403) and a cylinder push rod (402), and the spherical punch (406) forms a lifting structure through a hydraulic cylinder (401), a cylinder push rod (402) and a support frame (2), and the vertical center axis of the spherical punch (406) and the vertical center axis of the support frame (2) are arranged to overlap.

5. The metal sheet forming testing machine according to claim 1, characterized in that: The observation assembly (9) comprises a magnifying glass (901), a handle (902), a second rotating shaft (903), a spring (904), a support rod (905), a third rotating shaft (906), and a rotating roller (907); the side of the magnifying glass (901) is fixedly connected to the handle (902), the end of the handle (902) is rotatably connected to the second rotating shaft (903), the bottom of the handle (902) is fixedly connected to the spring (904), the top of the magnifying glass (901) is fixedly connected to the support rod (905), the top of the support rod (905) is fixedly connected to the third rotating shaft (906), and the outside of the third rotating shaft (906) is rotatably connected to the rotating roller (907).

6. A metal sheet forming testing machine according to claim 5, characterized in that: The rotating roller (907) forms a rotating structure with the support rod (905) via the third rotating shaft (906), and the support rod (905) and the magnifying glass (901) are vertically arranged; the handle (902) forms an elastic structure with the second support platform (8) via the spring (904), and the handle (902) forms a rotating structure with the second support platform (8) via the third rotating shaft (906).

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