Ultra-narrow U-shaped workpiece bending die with automatic material returning structure

Abstract

The utility model provides an ultra-narrow U-shaped workpiece bending die with an automatic material returning structure, which relates to the field of bending dies and comprises an upper die, a lower die and a guide pillar between the upper die and the lower die. The upper die comprises an upper die plate, an upper cutting die fixing plate and an upper cutting die, the upper cutting die fixing plate and the upper cutting die are arranged below the upper die plate, the lower die comprises a lower forming die, a floating material ejecting block and a lower forming die insert, and a material returning bent plate receding groove is formed in the middle of a material returning bent plate, a workpiece positioning plate, the lower die plate and the upper cutting die which are located on the lower forming die. The upper part of the material returning bent plate is bent towards the upper cutting die; a workpiece forming cavity is formed in the middle of the lower forming die, a spring is arranged between the bottom face of the workpiece forming cavity and the floating material ejecting block, a guide pin is fixed to the lower end of the floating material ejecting block, and the compressed distance of the spring in work is smaller than the distance between the lower end of the guide pin and the lower die plate. And the guide pin is in clearance fit with the lower forming die. According to the material returning structure, a product is automatically demolded by utilizing the material returning bent plate, so that the working efficiency is improved, and the industrial injury risk is reduced.

Description

Technical Field

[0001] The utility model relates to the field of bending dies, in particular to an ultra-narrow U-shaped workpiece bending die equipped with an automatic material-removing structure. Background Art

[0002] Ultra-narrow U-shaped workpieces are common parts in metal products, but it is difficult to complete processing with a bending tool on a bending machine. The main reason is that the bottom of this kind of workpiece after bending is too narrow, resulting in a lack of bending tools of suitable thickness to process this kind of workpiece. If the bending tool is designed to be too thin, it will lead to insufficient bearing capacity. In view of this, a stamping die is required to complete the one-time forming of this product. However, after the stamping die is formed once, the product is often completely wrapped on the upper die of the stamping die, making it inconvenient to remove the part, and there are also safety risks.

[0003] Therefore, a simple and practical material return structure is designed in this stamping die. When the upper die moves upward after stamping, the upper end of the product contacts the material return structure, and the upper die continues to move upward. The product will be pushed away from the upper die by the material return structure, and the automatic part removal is completed. This structural die can complete the forming of ultra-narrow U-shaped workpieces in one go and solve the problem of difficult part removal. Utility Model Content

[0004] The utility model aims to provide an ultra-narrow U-shaped workpiece bending die equipped with an automatic material-removing structure to solve the problem that the workpiece is difficult to be automatically taken out from the upper cutting die after being bent.

[0005] In order to achieve the above purpose, the adopted technical solution is: an ultra-narrow U-shaped workpiece bending mold equipped with an automatic material withdrawal structure, which consists of an upper mold, a lower mold and a guide column movably connected therebetween.

[0006] The upper die comprises an upper die plate, an upper die plate and an upper die plate installed below the upper die plate, the lower die mainly comprises a lower forming die, a floating ejecting block fixed in the middle of the lower forming die, a lower forming die insert fixed on the periphery of the floating ejecting block, a stripping bending plate located on the lower forming die, a workpiece positioning plate fixed on the upper surface of the lower forming die, and a lower die plate, wherein the lower forming die is fixed on the lower die plate; a stripping bending plate avoidance groove is provided in the middle of the upper die plate, and the upper part of the stripping bending plate is bent toward the upper die plate;

[0007] A workpiece forming cavity is provided in the middle of the lower forming die, in which the floating top material block and the lower forming die insert are fixed; a spring is provided between the bottom surface of the workpiece forming cavity and the floating top material block, and a guide pin is fixed at the lower end of the floating top material block to limit the horizontal displacement of the floating top material block during operation, and the distance by which the spring is compressed is smaller than the distance from the lower end of the guide pin to the lower template; there is a clearance fit between the guide pin and the lower forming die.

[0008] Specifically, the lower end of the stripping bent plate is movably connected to the lower forming die through a transverse guide rail. A position sensor is installed at a position close to the lower forming die insert on the inner side of the guide rail.

[0009] As a further improvement, the workpiece positioning plate is fixed to the lower forming die by bolts; and the lower forming die insert is fixed to the lower forming die by bolts.

[0010] Specifically improved, the stripping bent plate is fixed to the side surface of the lower forming die by means of bolts.

[0011] As a further improvement, the material stripping and bending plate avoidance groove is located in the middle of the upper cutting die, and its width is narrower than the width of the bent part product.

[0012] Preferably, the guide pin is a cylindrical pin whose upper portion is threadedly connected to the floating lift block.

[0013] As a further improvement, the stripping bending plate is bent at 90° toward the upper cutting die direction.

[0014] Preferably, the floating top material block is an inverted T-shaped structure, which is convenient for floating up and down.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The material-returning structure effectively avoids the problem of difficult forming caused by the U-shaped bend of the bent part being too narrow, and the product can be automatically separated from the upper die through the design of the material-returning bending plate, thereby improving work efficiency and reducing the risk of work-related injuries. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a left side view of the overall structure of the embodiment of the utility model;

[0018] Figure 2 These are the front view and left view of the upper cutting die, showing the position of the material withdrawal bend plate avoidance groove milled in the middle part of the upper cutting die.

[0019] Figure 3 This is a state diagram of the lower die when the spring is not compressed in Example 1;

[0020] Figure 4 This is a state diagram of the lower die when the punch press runs to the bottom dead center in Example 1;

[0021] Figure 5 It is a top view of the lower mold of Example 2;

[0022] Figure 6 These are the front view and left view of the bent product.

[0023] Markings in the figure: 1. Upper template, 2. Upper cutting die fixing plate, 3. Upper cutting die, 4. Guide column, 5. Stripping bending plate, 6. Workpiece positioning plate, 7. Lower template, 8. Lower forming die, 9. Lower forming die insert, 10. Floating ejector block, 11. Spring, 12. Cylindrical pin, 13. Bending part, 14. Stripping bending plate avoidance groove, 15. Position sensor, 16. Guide rail. DETAILED DESCRIPTION

[0024] The present invention will be further explained and illustrated below in conjunction with the accompanying drawings and embodiments.

[0025] Example 1: Figure 1 and Figure 2 As shown, an ultra-narrow U-shaped workpiece bending die equipped with an automatic material stripping structure is composed of an upper die, a lower die and a guide column 4 movably and slidably connected to the upper die.

[0026] The upper die includes an upper die plate 1, an upper cutting die fixing plate 2 and an upper cutting die 3 installed below the upper die plate 1; the lower die includes a lower forming die 8, a T-shaped floating ejecting block 10 fixed in the middle of the lower forming die 8, a lower forming die insert 9 fixed by bolts on the outer periphery of the floating ejecting block 10, a stripping bending plate 5 located on the outer side of the lower forming die 8, and a workpiece positioning plate 6; the lower forming die 8 is fixed on the lower die plate 1.

[0027] The lower part of the stripping bend plate 5 is connected to the lower forming die 8 by bolts, and the upper part is bent toward the upper cutting die 3. The bending angle of the stripping bend plate 5 is 90°, and the upper front end thereof is close to the upper cutting die 3. In order to make way for the stripping bend plate 5, a stripping bend plate avoidance groove is provided in the middle part of the upper cutting die 3. A workpiece forming cavity is provided in the middle of the lower forming die 8, and the floating ejector block 10 and the lower forming die insert 9 are fixed therein. A spring 11 is provided between the bottom surface of the workpiece forming cavity and the upper floating ejector block 10.

[0028] A cylindrical pin 12 is threadedly connected to the lower end of the floating ejector block 10 to limit the horizontal displacement of the floating ejector block during stamping; there is a clearance fit between the cylindrical pin 12 and the lower forming die 8. When the cylindrical pin 12 moves downward to the lowest point along with the floating ejector block 10, its lower end is still some distance away from the lower die plate 7. The workpiece positioning plate 6 is fixed to the lower forming die 8 by bolts.

[0029] Working process of embodiment 1: Figure 3 and Figure 4As shown, first, one end of the raw material of the bending part 13 is pushed against the workpiece positioning plate 6, and then the upper die begins to move downward. When the upper die 3 contacts the raw material of the bending part 13, it continues to move downward. At this time, the spring 11 is compressed, and the flat-plate-shaped raw material of the bending part 13 is pressed into an ultra-narrow U-shaped bending part 13 product by the joint action of the upper die 3 and the lower forming die insert 9. In this process, the floating ejector block 10 and the cylindrical pin 12 move downward together with the bending part 13. After the workpiece is formed, the upper die 3 begins to move upward with the upper template 1 and gradually moves out of the lower forming die 8. At this time, the floating ejector block 10 will also move upward against the bending part 13 under the action of the spring 11 until the force of the spring is completely released. Thereafter, the upper die 3 continues to move upward with the bending part 13 product until the upper end of the bending part 13 product contacts the material stripping bending plate 5, and the upper die 3 continues to move upward. The bending part 13 product is separated from the upper die 3 under the push of the material stripping bending plate 5, and the automatic removal operation of the bending part 13 product is completed.

[0030] Example 2: Figure 5 As shown, a position sensor 15 is installed on the inner side of the guide rail 16, and the guide rail 16 passes through the middle of the workpiece positioning plate 6. The stripping bending plate 5 is slidably connected to the lower forming die 8 through the guide rail 16, and the stripping bending plate 5 can move from one end of the guide rail 16 to the other end. The other structures of this bending mold are consistent with those of Example 1.

[0031] Working process of Example 2: When the upper cutting die 3 completes the bending operation and moves upward to leave the floating forming block 6, the position sensor 15 sends a signal, and the stripping bending plate 5 moves inward from the outside of the lower forming block 8 until its upper part is close to the upper cutting die 3, and then the upper cutting die 3 moves upward with the upper template 1, and the bent part 13 product contacts the lower surface of the stripping bending plate 5, and then the upper cutting die 3 continues to move upward, and the stripping bending plate 5 pushes the bent part 13 product away from the upper cutting die 3, completing the automatic removal operation of the bent part 13 product.

[0032] The products processed by the utility model are as follows Figure 6 shown.

[0033] Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present utility model.

[0034] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary, but not restrictive, and the scope of the present invention is defined by the appended claims rather than the above explanations and descriptions, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. At the same time, any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. An ultra-narrow U-shaped workpiece bending die equipped with an automatic material stripping structure, comprising an upper die, a lower die and a guide column (4) movably connected therebetween, wherein the upper die comprises an upper die plate (1), an upper die fixing plate (2) and an upper die plate (3) below the upper die plate (1), the lower die comprises a lower forming die (8), a floating ejecting block (10) fixed in the middle of the lower forming die (8), a lower forming die insert (9) fixed on the periphery of the floating ejecting block (10), a workpiece positioning plate (6) fixed on the upper surface of the lower forming die (8), and a lower die plate (7), wherein the lower forming die (8) is fixed on the lower die plate (7), and characterized in that: The upper cutting die (3) is provided with a stripping bend plate avoidance groove (14), and also includes a stripping bend plate (5) located on the lower forming die (8), the upper part of the stripping bend plate (5) being bent toward the upper cutting die (3); a workpiece forming cavity is provided in the middle of the lower forming die (8), and the floating ejector block (10) and the lower forming die insert (9) are fixed inside the workpiece forming cavity; A spring (11) is provided between the bottom surface of the workpiece forming cavity and the floating ejection block (10), and a guide pin is provided at the lower end of the floating ejection block (10) for limiting the horizontal displacement of the floating ejection block (10) during operation. The distance that the spring is compressed is smaller than the distance from the lower end of the guide pin to the lower mold plate (7); and there is a clearance fit between the guide pin and the lower molding die (8).

2. The bending die according to claim 1, characterized in that: The workpiece positioning plate (6) is fixed to the lower forming die (8) by means of bolts; and the lower forming die insert (9) is fixed to the lower forming die (8) by means of bolts.

3. The bending die according to claim 1, characterized in that: The stripping bent plate (5) is connected to the side of the lower forming die (8) by means of bolts.

4. The bending die according to claim 1, characterized in that: The lower end of the stripping bent plate (5) is movably connected to the lower forming die (8) via a transverse guide rail (16); a position sensor (15) is installed on the inner side of the guide rail (16) near the lower forming die insert (9).

5. The bending die according to claim 1, characterized in that: The material stripping bending plate avoidance groove (14) is located in the middle of the upper cutting die (3), and its width is narrower than the width of the bending part (13) product.

6. The bending die according to claim 1, characterized in that: The guide pin is a cylindrical pin (12) whose upper part is threadedly connected to the floating top material block (10).

7. The bending die according to claim 1, characterized in that: The upper part of the stripping bending plate (5) is bent 90 degrees toward the upward cutting die (3).

8. The bending die according to claim 1, characterized in that: The floating top material block (10) is an inverted T-shaped structure, which is convenient for floating up and down.

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