A grid printing tool for sheet metal test samples

Abstract

A kind of metal sheet experimental sample grid printing tool, belong to metal sheet detection equipment technical field, for clamping experimental sample carries out grid printing.The technical scheme is: the upper top surface center position of base is fixed with adsorption disk, sample is adsorbed on adsorption disk, grid plate moving frame is placed above the top surface of base, grid plate moving frame center has grid plate fixed clamp, grid plate is clamped in grid plate fixed clamp, the upper part of four lead screws is respectively connected with the screw hole of grid plate moving frame, the lower part of four lead screws is respectively fixedly connected with four driven gear sleeves in base box, motor is vertically fixed in the lower center of base box, driving gear is sleeved on motor shaft, and the circumference of driving gear is respectively engaged with four driven gears.This novel type guarantees the fixing of experimental sample and grid plate relative position, effectively avoids the failure of grid printing due to the position movement of grid plate or sample, and realizes the secondary repair function of grid printing.

Description

Technical Field

[0001] This utility model relates to a grid printing fixture for metal sheet forming limit test samples, belonging to the technical field of metal sheet testing equipment. Background Technology

[0002] The forming limit test for thin metal sheets is mainly used to determine the forming limit diagram (FLD) of thin metal sheets to assess the material's formability and provide a reference for early part design and forming process development. This test is widely used in the automotive and home appliance manufacturing industries and is an essential step in the selection and development of automotive and home appliance components. According to the experimental requirements in the national standard GB-T15825.8-2008, conducting the forming limit test for thin metal sheets requires preparing nine specimens of different sizes, with three parallel specimens for each size. To determine the material's ultimate strain, a strain analysis grid needs to be fabricated on the surface of each specimen. The clarity of the grid determines the accuracy of the experimental data. Currently, the main method for grid fabrication is electrochemical etching, using an electro-etching marking machine and a grid plate for manual printing. However, this method is significantly affected by human factors during operation and cannot determine the grid clarity during printing, making it impossible to guarantee the quality of the grid printing in a single pass. Furthermore, since manual operation cannot guarantee that the grid on the grid plate will completely overlap with the grid printed in the first pass, it is impossible to repair grids with poor initial printing quality. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a grid printing fixture for metal sheet experimental samples. This grid printing fixture can improve the grid printing efficiency and clarity of metal sheet experimental samples, and improve the accuracy of experimental data.

[0004] The technical solution to the above technical problem is: A grid printing fixture for experimental samples of thin metal sheets includes a base, an adsorption disk, a grid plate moving frame, a grid plate fixing clamp, lead screws, a motor, a driving gear, and driven gears. The base is a vertically placed box with a square top surface. An adsorption disk is fixed at the center of the top surface of the base, and the sample is adsorbed onto the adsorption disk. The grid plate moving frame is a square plate frame located above the top surface of the base. A grid plate fixing clamp is located at the center of the grid plate moving frame, and the grid plate is held in the grid plate fixing clamp. There are screw holes at the four corners of the grid plate moving frame and lead screw sliding holes at the four corners of the top surface of the base. Four lead screws pass through the lead screw sliding holes, and the upper parts of the four lead screws are threaded to the screw holes at the four corners of the grid plate moving frame. The lower parts of the four lead screws are fixedly connected to four driven gears in the box of the base. The motor is vertically fixed at the center of the lower part of the box of the base, and a driving gear is mounted on the motor shaft. The circumference of the driving gear meshes with the four driven gears.

[0005] The above-mentioned metal sheet experimental sample grid printing fixture, wherein the adsorption disk is connected to the top surface of the base by bolts, the adsorption disk is connected to the disk switch, and the disk switch is installed on the side wall of the base.

[0006] The grid printing fixture for the above-mentioned metal sheet experimental sample has screw holes at the four corners of the grid plate moving frame, which are composed of round holes and threaded sleeves. The four corners of the grid plate moving frame have round holes with a diameter larger than that of the lead screw. The four threaded sleeves are fixed above the round holes and mesh with the four lead screws respectively.

[0007] The above-mentioned metal sheet experimental sample grid printing fixture consists of an L-shaped clamping plate, clamping springs, and pull rods. The center of the grid plate moving frame has a square slot. Four L-shaped clamping plates are placed on the inner sides of the four sides of the square slot. The two ends of four sets of clamping springs are fixedly connected to the rear of the four L-shaped clamping plates and the four walls of the square slot. The front ends of four pull rods are fixedly connected to the rear of the four L-shaped baffles. There are horizontal circular holes that penetrate vertically through the four walls of the grid plate moving frame on the four walls of the square slot. The rods of the four pull rods pass through the circular holes in the four walls of the square slot and reach the outside of the four side walls of the grid plate moving frame. The rods of the pull rods and the circular holes of the grid plate moving frame are in sliding fit.

[0008] In the above-mentioned metal sheet experimental sample grid printing fixture, the four driven gears are respectively mounted on the lower ends of the four lead screws, and the locking nuts fix the four driven gears to the lower ends of the four lead screws respectively.

[0009] The above-mentioned metal sheet experimental sample grid printing fixture has a motor connected to a motor forward switch and a motor reverse switch, which are fixed on the side wall of the base.

[0010] The beneficial effects of this utility model are: The adsorption disk of this invention can fix and adsorb the sample, keeping the sample in a stable position; the grid fixing clamp at the center of the grid plate moving frame can stably hold the grid plate through the L-shaped clamping plate and clamping spring, keeping the grid plate fixed in the center of the grid plate moving frame and precisely corresponding to the sample; the four corners of the grid plate moving frame are engaged with four lead screws, and the rotation of the lead screws can move the grid plate moving frame up and down; the lead screws are connected to the motor through driven gears and driving gears, and the motor can drive the lead screws to rotate, so as to achieve the purpose of moving the grid plate moving frame and the grid plate up and down.

[0011] This utility model has a reasonable structure and is easy to use. It can accurately align the grid plate with the sample and press it firmly, ensuring the fixation of the relative position of the test sample and the grid plate. It realizes the secondary repair function of grid printing and effectively avoids grid printing failure due to the movement of the grid plate or sample position during the grid printing process. It improves the grid quality of the test sample and increases the accuracy of the test data. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 yes Figure 1 Cross-sectional view; Figure 3 yes Figure 1 Top view; Figure 4 This is a sectional view of the grid plate moving frame; Figure 5 This is a structural diagram of the base.

[0013] The following are the markings in the diagram: 1. Base, 2. Adsorption disk, 3. Sample, 4. Grid plate moving frame, 5. Grid plate fixing clamp, 6. Grid plate, 7. Lead screw, 8. Motor, 9. Drive gear, 10. Driven gear, 11. Threaded sleeve, 12. Square slot, 13. Lead screw sliding hole, 14. L-shaped clamp, 15. Clamping spring, 16. Pull rod, 17. Grid switch, 18. Motor forward switch, 19. Motor reverse switch, 20. Locking nut. Detailed Implementation

[0014] This utility model consists of a sample fixing unit, a grid plate fixing unit, and a height adjustment unit.

[0015] The sample fixing unit includes a base 1 and an adsorption disk 2. The sample fixing unit is used to fix the sample 3.

[0016] The grid plate fixing unit includes a grid plate moving frame 4 and a grid plate fixing clamp 5. The grid plate fixing unit is used to clamp the grid plate 6 so that the sample 3 can be grid printed through the grid plate 6.

[0017] The height adjustment unit includes a lead screw 7, a motor 8, a drive gear 9, and a driven gear 10. The height adjustment unit is used to raise and lower the grid plate fixing unit, and to move the grid plate 6 above the sample 3 for grid printing.

[0018] Figure 1 , 5 The sample fixing unit's base 1 is a vertically placed box. The top surface of the base 1 is square, and an adsorption disk 2 is fixed at the center of the top surface. The adsorption disk 2 is connected to the top surface of the base 1 by bolts. The adsorption disk 2 is also connected to a disk switch 17, which is mounted on the side wall of the base 1. Turning on the disk switch 17 will adsorb the sample 3 onto the adsorption disk 2.

[0019] Figure 1 , 2 As shown in Figures 3 and 4, the grid plate moving frame 4 of the grid plate fixing unit is a square frame, located above the top surface of the base 1. The grid plate moving frame 4 has a square slot 12 in its center, and the grid plate fixing clamp 5 is installed in the square slot 12, holding the grid plate 6 within the clamp 5. The grid plate moving frame 4 has screw holes at its four corners, each consisting of a round hole and a threaded sleeve 11. The round holes are located at the four corners of the grid plate moving frame 4, and their diameter is larger than the diameter of the lead screw 7. Four threaded sleeves 11 are fixed above the round holes, and each of the four threaded sleeves 11 engages with one of the four lead screws 7. The lead screws 7 can drive the grid plate moving frame 4 to move up and down via the threaded sleeves 11.

[0020] Figure 1 , 2 As shown in Figures 3 and 4, the grid fixing clamp 5 in the central square slot 12 of the grid plate moving frame 4 consists of an L-shaped clamping plate 14, a clamping spring 15, and a pull rod 16. The four L-shaped clamping plates 14 are respectively placed inside the four sides of the square slot 12. The front ends of the four sets of clamping springs 15 abut against the rear of the four L-shaped clamping plates 14, and the rear ends of the clamping springs 15 abut against the four walls of the square slot 12. The front ends of the four pull rods 16 are respectively fixedly connected to the rear of the four L-shaped clamping plates 14. There are horizontal circular holes that penetrate vertically through the four walls of the grid plate moving frame 4 on the four walls of the square slot 12. The rods of the four pull rods 16 pass through the circular holes in the four walls of the square slot 12 to reach the outside of the four side walls of the grid plate moving frame 4. The rods of the pull rods 16 and the circular holes of the grid plate moving frame 4 are in sliding fit. Pulling the lever 16 backward will move the L-shaped baffle 14 backward to place the grid plate 6, and the clamping spring 15 will push the L-shaped baffle 14 forward to clamp the grid plate 6.

[0021] Figure 1 , 2As shown in sections 3 and 5, the upper part of the four lead screws 7 of the height adjustment unit drives the grid plate moving frame 4 of the grid plate fixing unit to move up and down. The lower part of the four lead screws 7 is connected to four driven gears 10 in the housing of the base 1. The four driven gears 10 are respectively fitted on the lower end of the four lead screws 7, and the locking nut 20 fixes the four driven gears 10 to the lower end of the four lead screws 7. The motor 8 is vertically fixed to the lower center of the housing of the base 1. The motor shaft is fitted with a drive gear 9. All four driven gears 10 mesh with the drive gear 9 and have the same transmission ratio. The motor 8 is connected to the motor forward switch 18 and the motor reverse switch 19, which are fixed to the side wall of the base 1.

[0022] The usage process of this utility model is as follows: First, place sample 3 on adsorption disk 2, adjust the position of sample 3, and turn on disk switch 17 of base 1 to adsorb and fix sample 3; Then, pull the lever 16 of the mesh fixing clamp 5 backward to move the L-shaped baffle 14 of the mesh fixing clamp 5 backward, place the mesh plate 6 in the square slot 12 of the mesh plate moving frame 4, slowly release the lever 16, and the clamping spring 15 pushes the L-shaped baffle 14 forward to clamp the mesh plate 6. When the motor forward switch 18 of the base 1 is activated, the motor 8 rotates, which drives the drive gear 9 to rotate. The drive gear 9 drives the driven gear 10 to rotate, and the driven gear 10 drives the four lead screws 7 to rotate. The four lead screws 7 drive the grid plate moving frame 4 to move downward through the threaded sleeve 13. When the grid plate moving frame 4 moves to a position above the sample 3, the grid plate 6 held in the middle of the grid plate moving frame 4 will come into full contact with the surface of the sample 3, and the motor 8 will stop rotating. Finally, using an electro-etching marking machine, a grid pattern is printed on the surface of experimental sample 3. After printing, press the motor reverse switch 19 to raise the grid plate moving frame 4 and check the grid quality of experimental sample 3. If the grid quality does not meet the requirements, press the motor forward switch 18 to lower the grid plate moving frame 4 again for a second repair printing until the grid quality meets the requirements. Then press the motor reverse switch 19 again, turn off the disk switch 17, and take out the printed experimental sample 3.

[0023] The embodiment of this utility model is a grid printing device designed for the standard template described in GB / T 15825.8-2008 "Forming properties and test methods of sheet metal - Part 8: Guide to the determination of forming limit diagram (FLD)", and the specific parameters are as follows: The sample in GB_T 15825.8-2008 "Metallic sheet forming properties and test methods - Part 8: Guide to the determination of forming limit diagram (FLD)" is sample 3 in this utility model, with specific dimensions of 180mm*180mm; The base 1 described in this utility model has a length of 750mm, a width of 750mm, and a height of 700mm; The size of the grid plate 6 is 300mm*300mm, the length of the grid plate moving frame 4 is 700mm, the width is 700mm, and the thickness is 70mm. The square slot 12 is 450mm long and 450mm wide. The L-shaped clamp 14 of the grid plate fixing clamp 5 has a length of 295mm and a width of 295mm. The clamping spring 15 has a diameter of 25mm, a length of 100mm, and can be compressed to 30mm. The pull rod 16 has a diameter of 20mm. The diameter of lead screw 7 is 30mm and its length is 300mm; The motor uses a servo motor to directly drive the gear mechanism. The driving gear 9 has a diameter of 600mm and a thickness of 35mm; the driven gear 10 has a diameter of 150mm and a thickness of 37mm.

Claims

1. A grid printing tool for sheet metal test samples, characterized by: It includes a base (1), an adsorption disk (2), a grid plate moving frame (4), a grid plate fixing clamp (5), a lead screw (7), a motor (8), a driving gear (9), and a driven gear (10). The base (1) is a vertically placed box with a square top surface. An adsorption disk (2) is fixed at the center of the top surface of the base (1), and the sample (3) is adsorbed onto the adsorption disk (2). The grid plate moving frame (4) is a square plate frame located above the top surface of the base (1). A grid plate fixing clamp (5) is located at the center of the grid plate moving frame (4), and the grid plate (6) is clamped onto the grid plate. In the fixed clamp (5), there are screw holes at the four corners of the grid plate moving frame (4), and there are screw sliding holes (13) at the four corners of the top surface of the base (1). Four screws (7) are inserted into the screw sliding holes (13). The upper part of the four screws (7) is threaded to the screw holes at the four corners of the grid plate moving frame (4). The lower part of the four screws (7) is fixedly connected to four driven gears (10) in the housing of the base (1). The motor (8) is vertically fixed at the lower center of the housing of the base (1). The motor shaft is fitted with a drive gear (9). The circumference of the drive gear (9) meshes with the four driven gears (10).

2. The grid printing tool for sheet metal test coupons of claim 1, wherein: The adsorption disk (2) is connected to the top surface of the base (1) by bolts. The adsorption disk (2) is connected to the disk switch (17), and the disk switch (17) is installed on the side wall of the base (1).

3. The grid printing tooling for sheet metal test coupons of claim 1, wherein: The screw holes at the four corners of the grid plate moving frame (4) are composed of round holes and threaded sleeves (11). The four corners of the grid plate moving frame (4) have round holes with a diameter larger than that of the lead screw (7). The four threaded sleeves (11) are fixed above the round holes respectively, and the four threaded sleeves (11) mesh with the four lead screws (7) respectively.

4. The grid printing tooling for sheet metal test coupons of claim 1, wherein: The grid fixing clamp (5) described above consists of an L-shaped clamp (14), a clamping spring (15), and a pull rod (16). The center of the grid plate moving frame (4) has a square slot (12). The four L-shaped clamps (14) are placed on the inner sides of the four sides of the square slot (12). The two ends of the four sets of clamping springs (15) are fixedly connected to the rear of the four L-shaped clamps (14) and the four walls of the square slot (12). The front ends of the four pull rods (16) are fixedly connected to the rear of the four L-shaped baffles (14). There are horizontal round holes that penetrate the four walls of the grid plate moving frame (4) vertically on the four walls of the square slot (12). The rods of the four pull rods (16) pass through the round holes of the four walls of the square slot (12) to reach the outside of the four side walls of the grid plate moving frame (4). The rods of the pull rods (16) and the round holes of the grid plate moving frame (4) are in sliding fit.

5. The grid printing tooling for sheet metal test coupons of claim 1, wherein: The four driven gears (10) are respectively fitted onto the lower ends of the four lead screws (7), and the locking nuts (20) fix the four driven gears (10) to the lower ends of the four lead screws (7).

6. The grid printing tooling for sheet metal test coupons of claim 1, wherein: The motor (8) is connected to a motor forward switch (18) and a motor reverse switch (19) respectively. The motor forward switch (18) and the motor reverse switch (19) are fixed on the side wall of the base (1).

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