Arc-shaped pipe bending die

Abstract

The arc-shaped pipe bending die comprises an upper die body and a lower die body which are matched with each other in the height direction, a forming protrusion is arranged in the middle of the bottom of the upper die body, and an inclined slope is arranged from the forming protrusion to the outer side end of the upper die body. The lower die comprises a mounting plate and two limiting plates, the two limiting plates are located in the same height direction and right face the upper die, the two limiting plates are symmetrically connected to the mounting plate through hinge shafts in a hinged mode, a preset gap is formed between the two limiting plates, and the limiting plates are located in the same height direction and right face the upper die. And when the upper die is pressed downwards, the forming protrusions can be matched with the inclined limiting plates on the two sides to bend a pipe in a bending mode. According to the arc-shaped pipe bending die, a workpiece can be rapidly bent and formed, meanwhile, the application range is wide, and the equipment cost can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of bending dies, in particular to an arc-shaped pipe bending die used for a punching machine or a press machine. Background Art

[0002] In conventional bending dies, generally on a punch or press, a corresponding bending shape is formed by using a forming protrusion of an upper die in cooperation with a forming cavity of a lower die.

[0003] This conventional technology has great limitations, that is, one mold can only form a workpiece with one curved shape, and for workpieces with different curved shapes, the upper mold and the lower mold need to be replaced simultaneously, which has high equipment costs and troublesome operations. Utility Model Content

[0004] The embodiment of the present application provides an arc-shaped pipe bending die, which can quickly form workpieces with various bending specifications within a certain range, has low equipment cost and good bending effect.

[0005] An embodiment of the present application provides an arc-shaped pipe bending die for use in a punching machine or a press, wherein the arc-shaped pipe bending die includes an upper die and a lower die that cooperate with each other in the height direction, a forming protrusion is provided at the middle position of the bottom of the upper die, and an inclined slope is formed from the forming protrusion to the outer end of the upper die, and the lower die includes a mounting plate and two limit plates, wherein the two limit plates are located in the same height direction and face the upper die, and the two limit plates are symmetrically connected to the mounting plate in a hinged manner through a hinge shaft, wherein a predetermined gap is provided between the two limit plates, so that when the upper die is pressed down, the pipe can be bent by cooperating with the limit plates inclined on both sides through the forming protrusion.

[0006] In a possible implementation, with the hinge axis as a dividing point, the length of the inner side end of the limiting plate is smaller than the length of the outer side end;

[0007] The lower mold also includes a limiting bottom plate, which is fixedly connected to the bottom of the mounting plate and extends horizontally below the limiting plate. When the upper mold and the lower mold are in place, a gap is maintained between the inner end of the limiting plate and the limiting bottom plate.

[0008] In a possible implementation, there are two limiting bottom plates, and the two limiting bottom plates are respectively located below the two limiting plates.

[0009] In a possible implementation, there are two mounting plates, the two mounting plates are symmetrically distributed relative to the two limiting plates, and the two ends of the hinge shaft are respectively vertically connected to the two mounting plates.

[0010] In a possible implementation, a plurality of reinforcing ribs are connected between the two mounting plates. The reinforcing ribs are located between the two limit plates, and the height of the reinforcing ribs on the mounting plates is configured such that when the upper mold and the lower mold are closed, a gap is maintained between the bent tube and the reinforcing ribs.

[0011] In a possible implementation, the two mounting plates extend in a vertical direction, and the limit plate protrudes upward, and the protrusion height is configured such that when the upper mold and the lower mold are closed, the bent portion of the tube is located between the two mounting plates.

[0012] Beneficial effects: Compared with the prior art, the arc-shaped pipe bending die provided by the present application can quickly form workpieces with various bending specifications within a certain range through the cooperation of the forming protrusions and the limiting plates on both sides. It only needs to replace different upper molds accordingly, which can effectively reduce the equipment cost. When the forming protrusions are different, the inclination angles of the limiting plates may be different. In addition, after the mold is closed, the limiting plates on both sides can be used to form the straight part of the workpiece well. At the same time, the gap between the limiting plates on both sides can be used to cooperate with the forming protrusion of the upper mold to make the workpiece bend naturally, and the bending effect is better.

[0013] The limiting plates are connected on both sides by the mounting plate to ensure the working stability of the limiting plates;

[0014] The length of the inner end of the limit plate is smaller than that of the outer end, and a limit bottom plate is also arranged under the limit plate. When the mold is not closed, the outer end of the limit plate abuts against the limit bottom plate, and the inner end remains in a slightly warped state. During the downward pressing of the upper mold, the forming bulge can be quickly matched to form the workpiece, thereby improving work efficiency. In addition, when the upper mold and the lower mold are closed in place, a gap is maintained between the inner end of the limit plate and the limit bottom plate, so that the limit bottom plate will not interfere with the forming of the workpiece, thereby ensuring the forming quality of the workpiece.

[0015] These and other purposes, features and advantages of the present invention are fully reflected in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of the arc tube bending die of the present application is shown.

[0017] Figure 2 A schematic diagram of the partial structure of the arc-shaped pipe bending die of the present application is shown.

[0018] Figure 3 A partial front view structural schematic diagram of the arc-shaped pipe bending die of the present application is shown. DETAILED DESCRIPTION

[0019] The following description is used to disclose the utility model so that those skilled in the art can implement the utility model. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the utility model defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the utility model.

[0020] Those skilled in the art should understand that, in the disclosure of the specification, the orientation or position relationship indicated by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0021] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0022] refer to Figures 1 to 3 The embodiment of the present application provides an arc-shaped pipe bending die for a punching machine or a press machine, wherein the press machine is a hydraulic press machine. The arc-shaped pipe bending die includes an upper die 10 and a lower die 20 that cooperate with each other in the height direction. A forming protrusion 11 is provided at the middle position of the bottom of the upper die 10, and the outer end of the forming protrusion 11 to the upper die 10 is an inclined slope 12, which is used to bend the workpiece 30 at the top of the workpiece 30. The lower mold 20 includes a mounting plate 21 and two limit plates 22, wherein the two limit plates 22 are located at the same height direction and face the upper mold 10, and the two limit plates 22 are symmetrically connected to the mounting plate 21 in a hinged manner through a hinge shaft 23, and there is a predetermined gap between the two limit plates 22, so that when the upper mold 10 is pressed down, the forming protrusion 11 can cooperate with the inclined limit plates 22 on both sides to bend the pipe (i.e., the workpiece 30). In this way, when the molds are closed, the limit plates 22 on both sides cooperate with the inclined slope 12 of the upper mold 10 to form the straight part of the workpiece 30 well, and the gap between the limit plates 22 on both sides cooperates with the forming protrusion 11 to make the workpiece 30 bend naturally, and the bending effect is better. In addition, when there is a small change in the bending curvature of the workpiece 30, it is only necessary to replace the upper mold 10 accordingly, so that the replaced forming protrusion 11 cooperates with the gap between the limit plates 22 on both sides to correspondingly bend the workpiece 30. It has a wide range of applications and can save equipment costs.

[0023] In one embodiment, with the hinge shaft 23 as the dividing point, the length of the inner side end of the limit plate 22 is smaller than the length of the outer side end; the lower mold 20 also includes a limit bottom plate 24, wherein the limit bottom plate 24 is fixedly connected to the bottom of the mounting plate 21 and extends horizontally below the limit plate 24. At the same time, when the upper mold 10 and the lower mold 20 are in place, a gap is maintained between the inner side end of the limit plate 22 and the limit bottom plate 24. In this way, in the initial state of the mold not being closed, the limit plate 2 The outer end of the limit plate 22 abuts against the surface of the limit bottom plate 24. At this time, the inner end of the limit plate 22 remains in a slightly tilted posture. During the pressing process of the upper mold 10, the inner end of the limit plate 22 can quickly cooperate with the forming protrusion 11 to tilt to a certain angle, so that the bending mold can work fully automatically and the work efficiency is higher. In addition, even when the mold is closed, there is still a gap between the inner end of the limit plate 22 and the limit bottom plate 24, so that the limit bottom plate 24 will not interfere with the forming work of the mold, thereby ensuring the bending quality of the workpiece 30. If there is no limit bottom plate 24, when the mold is not closed, the limit plate 22 will remain in an upright posture. When the upper mold 10 is pressed down, it is necessary to manually assist in rotating the limit plate 22, which will not only affect the work efficiency, but also have certain risks.

[0024] Further preferably, there are two limiting bottom plates 24 , and the two limiting bottom plates 24 are respectively located below the two limiting plates 22 , so as to save resources and reduce costs.

[0025] In one embodiment, the mounting plates 21 are provided with two pieces, and the two mounting plates 21 are symmetrically distributed relative to the two limiting plates 22, and the two ends of the hinge shaft 23 are respectively vertically connected to the two mounting plates 21, so that the limiting plates 22 are not prone to skew or deviate when cooperating with the upper mold 10, thereby improving the working stability of the limiting plates 22.

[0026] Further preferably, a plurality of reinforcing ribs 211 are connected between the two mounting plates 21, and the reinforcing ribs 211 are located between the two limiting plates 22, for reinforcing the structural connection strength between the two mounting plates 21, thereby further ensuring the working stability of the limiting plates 22. In addition, the height of the reinforcing ribs 211 on the mounting plates 21 is configured such that when the upper mold 10 and the lower mold 20 are closed, a gap is maintained between the bent pipe and the reinforcing ribs 211, so that the reinforcing ribs 211 can avoid interfering with the molding work of the mold, thereby ensuring the molding quality of the workpiece 30.

[0027] In one embodiment, the two mounting plates 21 extend in the vertical direction, and the limiting plate 22 protrudes above, and the protruding height is configured as follows: when the upper mold 10 and the lower mold 20 are closed, the bent portion of the tube is located between the two mounting plates 21, thereby limiting the workpiece 30 on both sides during the bending process of the workpiece 30 to prevent the workpiece 30 from being flattened and affecting the bending quality.

[0028] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The advantages of the present invention have been fully and effectively realized. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. Arc tube bending die, used for punching machine or press machine, characterized by: The arc-shaped pipe bending die includes an upper die and a lower die that cooperate with each other in the height direction. A forming protrusion is provided at the middle position of the bottom of the upper die. The outer end of the forming protrusion to the upper die is an inclined slope. The lower die includes a mounting plate and two limit plates, wherein the two limit plates are located in the same height direction and face the upper die. The two limit plates are symmetrically connected to the mounting plate in a hinged manner through a hinge shaft, wherein a predetermined gap is provided between the two limit plates, so that when the upper die is pressed down, the pipe can be bent by cooperating with the inclined limit plates on both sides through the forming protrusion.

2. The arc tube bending die according to claim 1, characterized in that: Taking the hinge axis as a dividing point, the length of the inner side end of the limit plate is smaller than the length of the outer side end; The lower mold also includes a limiting bottom plate, which is fixedly connected to the bottom of the mounting plate and extends horizontally below the limiting plate. When the upper mold and the lower mold are in place, a gap is maintained between the inner end of the limiting plate and the limiting bottom plate.

3. The arc tube bending die according to claim 2, characterized in that: The two limiting bottom plates are respectively located below the two limiting plates.

4. The arc tube bending die according to claim 2, characterized in that: There are two mounting plates, which are symmetrically distributed relative to the two limiting plates, and the two ends of the hinge shaft are respectively vertically connected to the two mounting plates.

5. The arc tube bending die according to claim 4, characterized in that: A plurality of reinforcing ribs are also connected between the two mounting plates. The reinforcing ribs are located between the two limiting plates, and the height of the reinforcing ribs on the mounting plates is configured such that when the upper mold and the lower mold are closed, a gap is maintained between the bent pipe and the reinforcing ribs.

6. The arc tube bending die according to claim 4, characterized in that: The two mounting plates extend in the vertical direction, and the limit plates protrude from the top. The protruding height is configured such that when the upper die and the lower die are closed, the bent portion of the tube is located between the two mounting plates.

Images