A thick-walled tube drawing die
By designing a thick-walled pipe-like tensioning die with a mold cavity structure of tensile R transition section, a pre-stretched closing section, an effective tensile straight section and a resistance-reducing draft section, the problem of stress concentration and tensile length in the tensile process of thick-walled pipe-like parts in the prior art is solved, and the reduction of tensile resistance and stress, the improvement of product surface quality and the improvement of production capacity are achieved.
Patent Information
- Application Number
- CN202420576540.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-25
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2034-03-25
AI Technical Summary
During the stamping and tensile die of existing thick-walled pipes, the material flow extrusion stress is concentrated, the tensile length is difficult to control, the demolding and unloading force is too large, the die wears quickly, the product surface is severely drawn, and the production capacity is insufficient.
A stretching die of thick-walled pipe-like parts is designed, and its mold cavity is a stretching R transition section, a pre-stretching closing section, an effective stretching straight section and a resistance reduction draft section. By adjusting the shape and angle of each section, the tensile resistance and stress are reduced and the tensile length is controlled.
Through this design, the tensile resistance becomes smaller, the tensile length of thick-walled pipe parts is controllable, and the stress becomes smaller, overcoming the serious situation of product surface wire drawing. The product can be easily unloaded in the mold, which improves production capacity and mold life.
Smart Images
Figure CN222710602U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of stretching dies, in particular to a thick-walled tube-like part stretching concave die. Background Art
[0002] like Figure 1 As shown, it is a high-pressure fuel distribution pipe F551 developed by the applicant. The product is equipped with a pipe part A, which is a bolt fixing bracket on the product. Please refer to Figure 2 , which is a cross-sectional view of the tube A, which is a tube formed by a stretching process. After stretching, its thickness is 1.2mm, which is a thick-walled tube. Of course, if the thickness range is between 1mm-3mm and the tube diameter is less than 6.7mm, it can be called a thick-walled tube.
[0003] At present, the above-mentioned thick-walled pipe parts are mainly made of Figure 3 The drawing die is used for drawing. The die cavity of the drawing die is designed as a straight circular diameter, and has a long effective drawing straight section B and a drawing R transition section C in the die cavity. With the drawing die, the flow extrusion of the material during the stamping and drawing process leads to pressure concentration (stress is concentrated in the small drawing diameter part). Since the drawing contact surface (i.e., the effective drawing straight section B) is relatively long, the extrusion stress is concentrated, the drawing length is difficult to control, the demoulding unloading force is too large, the die wears quickly, the product surface is seriously wiredrawing, and the production capacity cannot meet customer needs. Utility Model Content
[0004] The purpose of the utility model is to provide a thick-walled tube stretching die, which mainly solves the problems existing in the above-mentioned prior art. By using the stretching die of the utility model, the stretching resistance becomes smaller, so that the stretching length of the thick-walled tube can be controlled, and the stress is reduced at the same time, thus overcoming the serious wiredrawing problem on the surface of the product, and the product can be easily unloaded in the die.
[0005] To achieve the above purpose, the technical solution of the utility model is:
[0006] A drawing die for thick-walled tube parts, characterized in that: its die cavity is composed of a drawing R transition section, a pre-stretching closing section, an effective drawing straight section and a drag reduction draft section from bottom to top; the drawing R transition section is an annular rounded transition that is wider at the bottom and narrower at the top; the pre-stretching closing section is arranged at the upper end of the drawing R transition section, and is an annular cone-shaped setting that is wider at the bottom and narrower at the top, and the angle between the corresponding cone wall and the drawing die is 27-33°; the effective drawing straight section is arranged at the upper end of the pre-stretching closing section, and is a cylindrical setting with a height of 0.8-1.2mm; the drag reduction draft section is arranged at the upper end of the effective drawing straight section, and is an annular cone-shaped setting that is narrow at the bottom and wide at the top, and the angle between the corresponding cone wall and the drawing die is 3-5°.
[0007] The thick-walled tube-like part drawing die is characterized in that the drawing R transition section is a fillet of R2-R2.5.
[0008] The beneficial effect of the utility model is that by using the drawing die of the utility model, the drawing resistance becomes smaller, so that the drawing length of thick-walled pipe parts can be controlled, and the stress is reduced at the same time, thus overcoming the problem of severe wiredrawing on the surface of the product, and the product can be easily unloaded in the die. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 It is a schematic diagram of the structure of a high-pressure fuel distribution pipe (with a bolted fixing bracket).
[0010] Figure 2 yes Figure 1 Cross-sectional view of the bolt-fixed bracket.
[0011] Figure 3 It is a schematic diagram of the structure of an existing drawing die.
[0012] Figure 4 It is a structural schematic diagram of the stretching die of the utility model. DETAILED DESCRIPTION
[0013] The utility model is further described below in conjunction with the accompanying drawings. The accompanying drawings are only used for exemplary description and cannot be understood as limiting the present patent.
[0014] The utility model discloses a thick-walled tube-like stretching die, wherein the die cavity is sequentially composed of a stretching R transition section, a pre-stretching closing section, an effective stretching straight section and a drag reduction drafting section from bottom to top; the stretching R transition section is a circular rounded transition with a wide bottom and a narrow top; the pre-stretching closing section is arranged at the upper end of the stretching R transition section, and is a circular cone-shaped setting with a wide bottom and a narrow top, and the angle of the corresponding cone wall is 27-33°; the effective stretching straight section is arranged at the upper end of the pre-stretching closing section, and is a cylindrical setting with a height of 0.8-1.2mm; the drag reduction drafting section is arranged at the upper end of the effective stretching straight section, and is a circular cone-shaped setting with a narrow bottom and a wide top, and the angle of the corresponding cone wall is 3-5°. The stretching R transition section is a rounded corner of R2-R2.5.
[0015] See also Figure 4, which is a preferred embodiment of the present utility model for a thick-walled tube-like stretching die. As shown in the figure: the die cavity is composed of a stretching R transition section 4, a pre-stretching closing section 3, an effective stretching straight section 2 and a drag reduction drafting section 1 from bottom to top; the stretching R transition section 4 is a circular rounded transition with a wide bottom and a narrow top; the pre-stretching closing section 3 is arranged at the upper end of the stretching R transition section 4, and is a circular cone-shaped setting with a wide bottom and a narrow top, and the angle between the corresponding cone wall is 30°; the effective stretching straight section 2 is arranged at the upper end of the pre-stretching closing section 3, and is a cylindrical setting with a height of 1mm; the drag reduction drafting section 1 is arranged at the upper end of the effective stretching straight section 2, and is a circular cone-shaped setting with a narrow bottom and a wide top, and the angle between the corresponding cone wall is 4°.
[0016] When the embodiment of the utility model is used, since the mold has a pre-stretched closing section 3, the front end is slowly closed and stretched at an angle; since the mold has an effective stretching straight section 2, and its height is only 1mm, the stretching resistance is greatly reduced, and the serious wire drawing on the product surface is overcome; since the mold has a drag-reducing drafting section 1, the stretching resistance is well released, and the product can be easily unloaded in the die, and the stress is also reduced. In general, it solves the product quality problems generated after the original mold is used, meets the requirements of customer drawings, and can be operated and produced in batches, and at the same time ensures the life of the mold, with excellent results.
[0017] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. That is, any equivalent changes and modifications made according to the content of the patent application scope of the present invention should be within the technical scope of the present invention.
Claims
1. A thick-walled tube drawing die, characterized in that: The mold cavity comprises, from bottom to top, a stretching R transition section (4), a pre-stretching closing section (3), an effective stretching straight section (2) and a drag reduction draft section (1); the stretching R transition section (4) is a circular rounded transition section that is wider at the bottom and narrower at the top; the pre-stretching closing section (3) is arranged at the upper end of the stretching R transition section (4) and is a circular cone-shaped setting that is wider at the bottom and narrower at the top, and the angle between the corresponding cone wall and the stretching R transition section (4) is 27-33°; the effective stretching straight section (2) is arranged at the upper end of the pre-stretching closing section (3) and is a cylindrical setting with a height of 0.8-1.2 mm; the drag reduction draft section (1) is arranged at the upper end of the effective stretching straight section (2) and is a circular cone-shaped setting that is narrower at the bottom and wider at the top, and the angle between the corresponding cone wall and the stretching R transition section (4) is 3-5°.
2. The thick-walled tube drawing die according to claim 1, characterized in that: The stretching R transition section (4) has a rounded corner of R2-R2.5.