Flattening die for machining narrow-gap U-shaped workpiece

Abstract

A flattening die for machining a narrow-gap U-shaped workpiece is used for bending and flattening a half bending part of the workpiece to form a U-shaped groove, the flattening die comprises an upper die and a lower die, the lower surface of the upper die is detachably connected with a flattening punch, and the flattening punch corresponds to an inclined bending part of the workpiece positioned on the lower die; the leveling punch is provided with a side supporting surface, and the side supporting surface is parallel to the vertical bending part; the flattening punch is provided with a flattening surface, the flattening surface and the side supporting surface are distributed in a right-angle mode, and the flattening surface corresponds to the root portion of the inclined bending portion. The flattening punch is improved to be provided with the side supporting face and the flattening face, the side supporting face can support a vertical bending portion of a workpiece during die assembly, the vertical bending portion is guaranteed to be perpendicular, the flattening face is arranged at the root of an inclined bending portion in a patting mode, the flattening precision of the inclined bending portion can be guaranteed, in-place flattening or excessive flattening is avoided, and the whole flattening punch is simple in structure, low in cost and convenient to operate. And the leveling precision is high.

Description

Technical Field

[0001] This utility model relates to the field of sheet metal processing, specifically to a flattening die for processing narrow-gap U-shaped workpieces. Background Technology

[0002] Currently, some sheet metal slide rail products are made by bending and flattening to form U-shaped grooves to complete the mating of the contact surfaces and the assembly of the sliding parts. Because the products slide relative to each other, the contact surfaces need to be smooth to ensure stable mating clearances. Therefore, there are certain requirements for the straightness of sheet metal slide rails. In addition, it is quite difficult to process U-shaped grooves with current forming processes that require narrow clearances.

[0003] The current forming process is generally a die-edge pressing process: 60-degree bend → negative 60-degree bend → die-edge pressing. The corresponding forming molds are shown below. Figure 4 After trial molding, some defects were found in the final edge-pressing process of the mold. Products folded at a negative 60 degrees had severe head collapse after being flattened, and the products were unqualified.

[0004] Therefore, how to overcome the shortcomings of the existing technology mentioned above has become the subject of this utility model. Utility Model Content

[0005] The purpose of this invention is to provide a flattening die for machining narrow-gap U-shaped workpieces.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A flattening die for processing narrow-gap U-shaped workpieces is used to bend and flatten the semi-bent portion of the workpiece to form a U-shaped groove. The semi-bent portion includes a vertically bent portion connected to the horizontal portion of the workpiece and an inclinedly bent portion connected to the vertically bent portion at an acute angle. The flattening die includes an upper die and a lower die. A flattening punch is detachably connected to the lower surface of the upper die. The flattening punch corresponds to the inclinedly bent portion of the workpiece positioned on the lower die.

[0008] The flattening punch has a support surface on one side, which is parallel to the vertical bending part. When the upper die and the lower die are closed, the support surface on one side fits into the vertical bending part, providing horizontal support to the vertical bending part.

[0009] The flat punch has a flat surface that is perpendicular to the side support surface and corresponds to the root of the inclined bending portion, so that when the upper die and the lower die are closed, the flat surface fits into the root of the inclined bending portion.

[0010] Preferably, when the upper mold and the lower mold are closed, the side support surface moves to fit against the side wall of the lower mold.

[0011] Preferably, the bottom edge of the side support surface is rounded.

[0012] Preferably, when the upper mold and the lower mold are closed, the length of the contact surface that fits with the inclined bending portion is four times the thickness of the workpiece.

[0013] Preferably, the outer edge of the striking plane away from the side support surface is rounded, and the radius of the rounded corner is three times the thickness of the workpiece.

[0014] Preferably, the upper mold includes an upper mold base, an upper pad, an upper clamping plate, and an upper stripping plate arranged sequentially from top to bottom;

[0015] The upper pad, the upper mold base, and the upper clamping plate are detachably connected;

[0016] The upper ejector plate is disposed below the upper clamping plate and slides vertically with the upper mold base. The upper ejector plate corresponds to the horizontal part of the workpiece inside the inclined bending part.

[0017] The flattening punch is installed on the lower surface of the upper clamping plate and is located on one side of the upper release plate.

[0018] More preferably, the flattening punch has a protrusion on the side near the upper ejector plate, and the protrusion fits against the side wall of the upper ejector plate.

[0019] Preferably, the lower mold includes a lower mold base, a lower pad, and a lower template arranged sequentially from bottom to top. The workpiece is positioned on the lower template. When the upper mold and the lower mold are closed, the side support surface moves to fit against the side wall of the lower template.

[0020] The working principle and advantages of this utility model are as follows:

[0021] This invention improves the flattening punch by giving it a support surface on one side and a flat striking surface. When the mold is closed, the support surface can support the vertical bending part of the workpiece to ensure its verticality. The flat striking surface strikes the root of the inclined bending part, which can ensure the flattening accuracy of the inclined bending part and avoid not flattening it properly or flattening it too much. The entire flattening punch has a simple structure and high flattening accuracy.

[0022] The surface finish of the flattening punch of this invention can reach below 0.2 mm, the straightness after flattening can reach ±0.1 mm, and the accuracy of the U-groove can reach ±0.1 mm. Attached Figure Description

[0023] Appendix Figure 1 This is a schematic diagram of the mold opening structure of this utility model;

[0024] Appendix Figure 2 This is a schematic diagram of the mold-closing structure of this utility model;

[0025] Appendix Figure 3 This utility model Figure 2 Enlarged view of the structure of section A in the middle;

[0026] Appendix Figure 4 This is a schematic diagram of the mold after it has been flattened in the existing technology.

[0027] In the above figures: 100 is the semi-bend; 110 is the vertical bend; 120 is the inclined bend; 200 is the horizontal part of the workpiece; 300 is the U-shaped groove.

[0028] 1 Upper die; 11 Upper die base; 12 Upper backing plate; 13 Upper clamping plate; 14 Upper stripper plate; 2 Lower die; 21 Lower die base; 22 Lower backing plate; 23 Lower template; 3 Flat punch; 31 Side support surface; 32 Flat surface; 33 Protrusion. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0030] Example: The present invention will be clearly described below with illustrations and detailed description. Any person skilled in the art who understands the examples of the present invention can make changes and modifications based on the technology taught in the present invention without departing from the spirit and scope of the present invention.

[0031] The terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the scope of this work. Singular forms such as “a,” “this,” “this,” “the,” and “the” as used herein also include plural forms.

[0032] The terms "connection" or "positioning" as used in this article can refer to two or more components or devices making direct physical contact with each other, or making indirect physical contact with each other, or to two or more components or devices operating or moving with each other.

[0033] The terms “include,” “including,” and “have” used in this article are all open-ended, meaning they include but are not limited to.

[0034] The terms “front,” “back,” “up,” “down,” “left,” and “right” used in this article are directional terms. In this case, they are only used to describe the positional relationship between the structures and are not intended to limit the specific direction of the protection scheme or its actual implementation.

[0035] A flattening die for processing narrow-gap U-shaped workpieces is used to bend and flatten the semi-bent portion 100 of the workpiece to form a U-shaped groove 300. (See...) Figure 3 .

[0036] like Figure 1 and Figure 3 As shown, the semi-bent portion 100 includes a vertically bent portion 110 connected to the horizontal portion 200 of the workpiece and an inclined bent portion 120 connected to the vertically bent portion 110 at an acute angle.

[0037] like Figure 1-3 As shown, the flattening die includes an upper die 1 and a lower die 2. A flattening punch 3 is detachably connected to the lower surface of the upper die 1. The flattening punch 3 corresponds to the inclined bending portion 120 of the workpiece positioned on the lower die 2.

[0038] The flattening punch 3 has a side support surface 31, which is parallel to the vertical bending part 110. When the upper mold 1 and the lower mold 2 are closed, the side support surface 31 is in contact with the vertical bending part 110, providing horizontal support to the vertical bending part 110.

[0039] In this embodiment, when the upper mold 1 and the lower mold 2 are closed, the side support surface 31 moves to fit against the side wall of the lower mold 2, thereby positioning the flattening punch 3, ensuring that the side support surface 31 fits against the vertical bending part 110, providing side support to the vertical bending part 110, and preventing the vertical bending part 110 from tilting outward when the mold is pressed downward.

[0040] In this embodiment, the bottom edge of the side support surface 31 is rounded, which can achieve a guiding function.

[0041] The flat punch 3 has a flat surface 32, which is distributed at a right angle to the side support surface 31, and the flat surface 32 corresponds to the root of the inclined bending part 120, so that when the upper mold 1 and the lower mold 2 are closed, the flat surface 32 fits into the root of the inclined bending part 120.

[0042] In this embodiment, when the upper mold 1 and the lower mold 2 are closed, the length of the contact between the flat surface 32 and the inclined bending part 120 is about four times the thickness of the workpiece, ensuring that the inclined bending part 120 is flattened in place with high flattening accuracy, and avoiding the inclined bending part 120 not being flattened in place or being over-flattened.

[0043] In this embodiment, the outer edge of the striking surface 32 away from the side support surface 31 is set as a rounded corner, and the radius of the rounded corner is about three times the thickness of the workpiece. When the rounded corner comes into contact with the inclined bending portion 120, it can bend the inclined bending portion 120 by rotation, avoiding damage to the surface of the inclined bending portion 120 and affecting its smoothness.

[0044] In this embodiment, the upper mold 1 includes an upper mold base 11, an upper pad 12, an upper clamping plate 13, and an upper release plate 14 arranged sequentially from top to bottom.

[0045] The upper pad 12, the upper mold base 11, and the upper clamping plate 13 are detachably connected by screws.

[0046] The upper ejector plate 14 is located below the upper clamping plate 13 and slides vertically with the upper mold base 11. Specifically, it can slide with the upper mold base 11 via a sliding rod. The lower end of the sliding rod is fixed to the upper ejector plate 14, and the upper T-shaped head is slidably disposed in the T-shaped hole on the upper mold base 11 (not shown in the figure, which is an existing mature technology).

[0047] The upper ejector plate 14 corresponds to the horizontal part 200 of the workpiece inside the inclined bending part 120, and can press down the horizontal part 200 of the workpiece for bending when the mold is closed.

[0048] The flattening punch 3 is installed on the lower surface of the upper clamping plate 13 and is located on one side of the upper release plate 14.

[0049] In this embodiment, the flattening punch 3 has a protrusion 33 on the side near the upper ejector plate 14. The protrusion 33 fits against the side wall of the upper ejector plate 14 and slides with the side wall of the upper ejector plate 14 to achieve the positioning of the flattening punch 3.

[0050] In this embodiment, the lower mold 2 includes a lower mold base 21, a lower pad 22 and a lower template 23 arranged sequentially from bottom to top. The workpiece is positioned on the lower template 23. When the upper mold 1 and the lower mold 2 are closed, the side support surface 31 moves to fit against the side wall of the lower template 23.

[0051] The surface finish of the flattening punch 3 in this embodiment is less than 0.2 mm, the straightness after flattening can reach ±0.1 mm, and the accuracy of the U-shaped groove 300 can reach ±0.1 mm.

[0052] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A flattening die for processing narrow-gap U-shaped workpieces, used to bend and flatten the semi-bent portion of the workpiece to form a U-shaped groove, wherein the semi-bent portion includes a vertically bent portion connected to a horizontal portion of the workpiece and an inclinedly bent portion connected to the vertically bent portion at an acute angle, characterized in that: The flattening die includes an upper die and a lower die. A flattening punch is detachably connected to the lower surface of the upper die. The flattening punch corresponds to the inclined bending portion of the workpiece positioned on the lower die. The flattening punch has a support surface on one side, which is parallel to the vertical bending part. When the upper die and the lower die are closed, the support surface on one side fits into the vertical bending part, providing horizontal support to the vertical bending part. The flat punch has a flat surface that is perpendicular to the side support surface and corresponds to the root of the inclined bending portion, so that when the upper die and the lower die are closed, the flat surface fits into the root of the inclined bending portion.

2. The flattening die for processing narrow-gap U-shaped workpieces according to claim 1, characterized in that: When the upper mold and the lower mold are closed, the side support surface moves to fit against the side wall of the lower mold.

3. The flattening die for processing narrow-gap U-shaped workpieces according to claim 1, characterized in that: The bottom edge of the side support surface is rounded.

4. A flattening die for processing narrow-gap U-shaped workpieces according to claim 1, characterized in that: When the upper mold and the lower mold are closed, the length of the contact surface that fits with the inclined bending portion is four times the thickness of the workpiece.

5. A flattening die for machining a narrow-gap U-shaped workpiece according to claim 1, characterized in that: The outer edge of the striking plane away from the side support surface is set as a rounded corner, and the radius of the rounded corner is three times the thickness of the workpiece.

6. A flattening die for machining a narrow-gap U-shaped workpiece according to claim 1, characterized in that: The upper mold includes an upper mold base, an upper pad, an upper clamping plate, and an upper stripping plate arranged sequentially from top to bottom; The upper pad, the upper mold base, and the upper clamping plate are detachably connected; The upper ejector plate is disposed below the upper clamping plate and slides vertically with the upper mold base. The upper ejector plate corresponds to the horizontal part of the workpiece inside the inclined bending part. The flattening punch is installed on the lower surface of the upper clamping plate and is located on one side of the upper release plate.

7. A flattening die for machining a narrow-gap U-shaped workpiece according to claim 6, characterized in that: The flattening punch has a protrusion on the side near the upper ejector plate, which fits against the side wall of the upper ejector plate.

8. A flattening die for machining a narrow-gap U-shaped workpiece according to claim 1, characterized in that: The lower mold includes a lower mold base, a lower pad, and a lower template arranged sequentially from bottom to top. The workpiece is positioned on the lower template. When the upper mold and the lower mold are closed, the side support surface moves to fit against the side wall of the lower template.

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