Bending die

Abstract

The utility model discloses a bending die. The bending die is characterized by comprising a workbench, a left block, a right block, a sliding seat and a driving cylinder, the left block and the right block are fixed to the two sides of the workbench respectively. A guide rod is horizontally arranged between the left block and the right block; the sliding seat is in sliding fit with the guide rod and is driven by the driving cylinder to slide; a U-shaped male die is fixedly arranged on the left block; a first forming groove is formed in the outer side wall of the U-shaped male die. A U-shaped female die is fixedly arranged on the sliding seat; a second forming groove is formed in the inner side wall of the U-shaped female die. A front limiting table and a rear limiting table are fixedly arranged on the portions, located on the front side and the rear side of the U-shaped male die, of the workbench correspondingly. The straight pipe forming device can bend a straight pipe into a U-shaped bent pipe at a time, the forming process is simpler, and the straight pipe forming device has the advantages of being high in production efficiency, high in forming precision, easy to operate and the like.

Description

Technical Field

[0001] The utility model belongs to a bending die. Background Art

[0002] There is an existing air conditioning elbow, which is installed on the automobile air conditioner. Figure 1 ) is to process a straight tube N into a U-shaped bent tube M during production. The original method uses rotary bending (such as CN111496031A) and adopts bilateral simultaneous rotary molding. Compared with the present application, it has the following shortcomings and is analyzed as follows:

[0003] First, in the existing (such as CN111496031A) bending and forming of the bent portion in the middle of the bent pipe, the bending constraint groove, the third arc-shaped bending constraint groove and the second arc-shaped bending constraint groove are spliced ​​together. Since the three parts are combined and spliced ​​together instead of being integrated, it is difficult to control the accuracy at the same time, and it is easy to have a large gap at the splicing point. In addition, the forming process is very complicated, and the rotation angle of the two gears, the rising height of the third guide groove seat, etc. are required to be very precise, which affects the forming accuracy.

[0004] Secondly, since the existing ones (such as CN111496031A) only constrain the inner side of the bent tube during bending, but not the outer side, it is easy to bulge outwards when subjected to force, thereby affecting the size and shape accuracy. Utility Model Content

[0005] The utility model provides a bending die to solve the problems of complex forming process and low forming precision in the prior art;

[0006] In order to achieve the above-mentioned purpose, the scheme of the utility model is: a bending mold, characterized in that: it includes a workbench, a left block, a right block, a slide and a driving cylinder; the left block and the right block are respectively fixed on both sides of the workbench; a guide rod is horizontally arranged between the left block and the right block; the slide and the guide rod are slidably matched and driven by the driving cylinder to slide and displace; a U-shaped punch is fixedly arranged on the left block; a first molding groove is provided on the outer side wall of the U-shaped punch; a U-shaped die is fixedly arranged on the slide; a second molding groove is provided on the inner side wall of the U-shaped die; a front limit platform and a rear limit platform are respectively fixedly arranged on the workbench at the front and rear sides of the U-shaped punch.

[0007] Furthermore, two front ends of the U-shaped die are respectively provided with two semicircular parts; and transitional forming grooves connected with the second forming grooves are provided on the side walls of the two semicircular parts.

[0008] Furthermore, the guide rods are provided with two and are distributed in parallel with a front-back interval.

[0009] Furthermore, the driving cylinder is a booster cylinder.

[0010] Furthermore, the rear limiting platform has a first supporting plane, a first stop surface and a second stop surface.

[0011] Furthermore, the front limiting platform has a second supporting plane and a third stop surface.

[0012] Beneficial effects of the utility model:

[0013] First, the utility model adopts a push-bending method, which is different from the existing rotation bending method, and can accurately form a straight tube into a U-shaped bent tube at one time, which has the advantages of simple operation, simple forming process, high forming accuracy, and high production efficiency;

[0014] Second, in this embodiment, since the first forming groove of the U-shaped male mold and the second forming groove of the U-shaped female mold are combined to form, the bent pipe is constrained by the inner and outer double forming and will not bulge outward, which can improve the size and shape accuracy of the bent pipe after forming;

[0015] Third, in this embodiment, since the U-shaped female mold moves while the U-shaped male mold is fixed, the guide of the U-shaped female mold moves linearly and moves toward the U-shaped male mold for mold closing and forming. Since only the U-shaped female mold moves linearly, it is easy to control and the bending accuracy can be guaranteed.

[0016] Fourth, the utility model is very convenient to take out because when the driving cylinder drives the slide to move rightward and reset to its position, the bent pipe M can be pulled out rightward from the U-shaped punch and taken away;

[0017] Fifth, the utility model is that the front and rear parts of the straight tube are respectively placed on the front limit platform and the rear limit platform for positioning, and the straight tube is located on the right side of the U-shaped punch and close to the contact; at this time, the position and direction of the straight tube can be accurately positioned, and the operation is also very easy;

[0018] Sixth, when bending, the two semicircular parts on the U-shaped die of the utility model first contact the straight tube and are extruded through two transition forming grooves, and then smoothly transition and are extruded and bent by the second forming groove. This can avoid the problem of friction damage when the two front ends of the U-shaped die are in direct contact with the straight tube, and prevent the outer surface of the bent tube from being scratched. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a comparison diagram of the states when a straight tube is bent into a curved tube.

[0020] Figure 2-4 It is a structural schematic diagram of a bending die in the utility model.

[0021] Figure 5-7 This is a working state diagram of a bending mold in the utility model in step S10.

[0022] Figure 8-9 This is a working state diagram of a bending mold in the utility model in step S20. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0024] Example: See Figure 2-4 A bending mold includes a workbench 1, a left block 2, a right block 3, a slide seat 4 and a driving cylinder 5.

[0025] Among them, the left block 2 and the right block 3 are respectively fixedly installed on the left and right sides of the workbench 1; a guide rod 6 is horizontally arranged between the left block 2 and the right block 3; specifically, the left and right ends of the guide rod 6 are respectively fixedly connected to the left block 2 and the right block 3; the slide seat 4 is slidably matched with the guide rod 6 and is driven to slide and displace by the drive cylinder 5.

[0026] In this embodiment, the guide rods 6 are provided with two guide holes which are spaced apart from each other and are parallel to each other. Specifically, the slide 4 is provided with two guide holes which are respectively slidably matched with the two guide rods 6. The slide 4 can slide along the two guide rods 6 to realize double guidance, which can further improve the linear motion accuracy and the bending accuracy.

[0027] Among them, a U-shaped punch 7 is fixedly arranged on the left block 2; a first molding groove 7-1 is opened on the outer wall of the U-shaped punch 7; a U-shaped die 8 is fixedly arranged on the slide seat 4; a second molding groove 8-1 is opened on the inner wall of the U-shaped die 8.

[0028] In addition, a front stopper 9 and a rear stopper 10 are fixedly arranged on the workbench 1 at the front and rear sides of the U-shaped punch 7. Before bending, the front and rear ends of the straight tube N are placed on the front stopper 9 and the rear stopper 10 for position limiting, which can ensure that the position of the stress-deformed part during bending is accurate, and the direction of the straight tube N is accurate to ensure symmetrical forming.

[0029] In this embodiment, the driving cylinder 5 is a booster cylinder.

[0030] In other embodiments, the driving cylinder 5 may be a hydraulic telescopic cylinder.

[0031] Furthermore, the rear limit platform 10 has a first support plane 10-1, a first stop surface 10-2, and a second stop surface 10-3. Specifically, before bending, the rear portion of the straight tube N is horizontally supported by the first support plane 10-1 and positioned in height, while the rear end surface of the straight tube N contacts the first stop surface 10-2 and is precisely limited in the front-to-back direction, and the rear side wall of the straight tube N contacts the second stop surface 10-3 and is precisely limited in the left-to-right direction. The front limit platform 9 has a second support plane 9-1 and a third stop surface 9-2. Specifically, before bending, the front portion of the straight tube N is horizontally supported by the second support plane 9-1 and positioned in height, while the front side wall of the straight tube N contacts the third stop surface 9-2 and is precisely limited in the left-to-right direction. Before bending, the straight tube N can be positioned by the rear limit platform 10 and the front limit platform 9, and the position and direction of the straight tube N can be precisely located (see Figure 5-7 ) to ensure the position accuracy and forming accuracy of subsequent bending.

[0032] The working steps of this bending mold when in use are as follows:

[0033] S10, the front and rear parts of the straight tube N are placed on the front limit platform 9 and the rear limit platform 10 for positioning, and the straight tube N is located on the right side of the U-shaped punch 7 and close to the contact; at this time, the position and direction of the straight tube N are accurately positioned (see Figure 5-7 );

[0034] S20, then start the drive cylinder 5 to work and drive the slide 4 to move leftward until the U-shaped female mold 8 moves to the U-shaped male mold 7 to completely close the mold; at this time, the straight tube N is bent into a U-shaped bent tube M at one time (see Figure 8-9 );

[0035] S30, restart the drive cylinder 5 to drive the slide 4 to move rightward and reset to its position, then pull the bent pipe M out of the U-shaped punch 7 to the right and take it away.

[0036] Then, the above steps S10-S30 are repeated to achieve repeated bending processing of the next straight tube N.

[0037] In this embodiment, the first molding groove 7-1 of the U-shaped punch 7 and the second molding groove 8-1 of the U-shaped die 8 are combined to form the bent pipe, so that the bent pipe is double-constrained inside and outside and will not bulge outward, thereby improving the size and shape accuracy of the bent pipe after forming.

[0038] In this embodiment, the U-shaped die 8 moves while the U-shaped punch 7 is fixed, and the guide of the U-shaped die 8 moves linearly and moves toward the U-shaped punch 7 for mold closing. Since only the U-shaped die 8 moves linearly, it is easy to control and the bending accuracy can be guaranteed.

[0039] In the utility model, when the driving cylinder 5 drives the slide seat 4 to move rightward and reset to the right position, the bent pipe M can be pulled out rightward from the U-shaped punch 7 and taken away, so the taking of the parts is very convenient.

[0040] In the present invention, the front and rear parts of the straight tube N are respectively placed on the front limit platform 9 and the rear limit platform 10 for positioning, and the straight tube N is located on the right side of the U-shaped punch 7 and is close to the contact; at this time, the position and direction of the straight tube N can be accurately positioned, and the operation is also very convenient.

[0041] Embodiment 2: This embodiment is based on the embodiment 1 and further improved:

[0042] See also Figure 3-4 In this embodiment, two semicircular portions 8-2 are respectively provided at the two front ends of the U-shaped die 8; and transitional forming grooves 8-3 connected with the second forming grooves 8-1 are provided on the side walls of the two semicircular portions 8-2.

[0043] See also Fig. 9 In the above step S20, the two semicircular parts 8-2 on the U-shaped die 8 first contact the straight tube N and are extruded through the two transition forming grooves 8-3, and then smoothly transition and are extruded and bent by the second forming groove 8-1. This can avoid the problem of friction damage when the two front ends of the U-shaped die 8 are in direct contact with the straight tube N, and prevent the outer surface of the bent tube from being scratched.

[0044] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. A bending die, characterized in that: The machine comprises a workbench (1), a left block (2), a right block (3), a slide seat (4) and a drive cylinder (5); the left block (2) and the right block (3) are respectively fixed on two sides of the workbench (1); a guide rod (6) is horizontally arranged between the left block (2) and the right block (3); the slide seat (4) and the guide rod (6) are slidably matched and driven by the drive cylinder (5) to slide and move; A U-shaped punch (7) is fixedly arranged on the left block (2); a first molding groove (7-1) is provided on the outer side wall of the U-shaped punch (7); A U-shaped die (8) is fixedly arranged on the slide seat (4); a second molding groove (8-1) is provided on the inner side wall of the U-shaped die (8); The workbench (1) is fixedly provided with a front limit platform (9) and a rear limit platform (10) respectively at the front and rear sides of the U-shaped punch (7).

2. A bending die according to claim 1, characterized in that: Two front ends of the U-shaped die (8) are respectively provided with two semicircular portions (8-2); and transitional forming grooves (8-3) connected with the second forming grooves (8-1) are provided on the side walls of the two semicircular portions (8-2).

3. A bending die according to claim 1, characterized in that: The guide rods (6) are provided with two guide rods (6) which are spaced apart and distributed in parallel in front and back.

4. A bending die according to claim 1, characterized in that: The driving cylinder (5) is a booster cylinder.

5. A bending die according to claim 1, characterized in that: The rear limiting platform (10) is provided with a first supporting plane (10-1), a first stop surface (10-2) and a second stop surface (10-3).

6. A bending die according to any one of claims 1 to 5, characterized in that: The front limiting platform (9) is provided with a second supporting plane (9-1) and a third blocking surface (9-2).

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