CN110576133B - Method and equipment for forming cylindrical part of sheet body - Google Patents
Method and equipment for forming cylindrical part of sheet body Download PDFInfo
- Publication number
- CN110576133B CN110576133B CN201910768912.6A CN201910768912A CN110576133B CN 110576133 B CN110576133 B CN 110576133B CN 201910768912 A CN201910768912 A CN 201910768912A CN 110576133 B CN110576133 B CN 110576133B
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- conical surface
- forming
- flange
- shaping
- thickness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
Abstract
The invention discloses a method for forming a cylindrical part of a sheet body, which is applied to a square columnar blank and comprises the following steps: material breaking step: cutting a blank section with a certain length; strongly binding the sheet body: the lower end of the blank section is strongly bundled so that the lower end forms a sheet body, and the upper end of the blank section forms a head; a step of forming a cylindrical part: will the lower part cold-heading of head becomes the flange dish, just the periphery of flange dish leaves the shaping resistance edge, the shaping resistance edge is conical surface form, the thickness at shaping resistance edge is compared the thickness of flange dish is little, and is right the in-process that the lower part of head carries out the cold-heading will the last part cold-heading of head becomes the cylinder. During the forming process, the material near the flange meets a large forming resistance at the forming resistance edge, so that the lateral flow of the material near the flange is hindered.
Description
Technical Field
The invention relates to a method and equipment for forming a cylindrical part of a sheet body.
Background
Comparing fig. 7 and 15, one end of some of the plate-like parts requires a formed cylinder 23 and flange 21 (cold headed from the shape shown in fig. 7 to the shape shown in fig. 15). The flange 21 and the cylinder 23 are typically formed simultaneously for one end of the log. During cold heading, a portion of the material of the end portion flows in a transverse direction to form the flange 21, and another portion of the material of the end portion flows in a vertical direction to form the cylinder 23.
In terms of design requirements, the height of the cylinder 23 needs to be formed to be larger, that is, a longer cylinder 23 needs to be formed, so that in the forming process, even if the flange 21 is formed to meet the design size, the height of the cylinder 23 is not enough. In order to make the material flow to the position of the cylinder 23 as much as possible in the vertical direction during the forming process, according to the principle that the material flows in the direction with the minimum resistance, the material flow resistance of the position of the flange 21 needs to be increased, in the prior art, the transverse forming size of the flange 21 is generally increased, so that the material flow resistance of the position of the flange 21 is increased, and the material flow resistance of the position of the flange 21 is larger than that of the cylinder 23. However, this operation requires an increase in the transverse dimension of the flange 21, so that the transverse dimension of the flange 21 is much larger than the design dimension of the flange 21, and thus a large amount of excess material of the edge of the flange 21 has to be cut off in a subsequent step, resulting in waste of material.
Disclosure of Invention
In order to overcome the disadvantages of the prior art, an object of the present invention is to provide a method for forming a cylindrical portion of a sheet body, which can save materials. The other object of the present invention is to provide a device for forming a cylindrical portion of a sheet body, which can save materials.
A method for forming a cylindrical part of a sheet body is applied to a square columnar blank, and comprises the following steps:
material breaking step: cutting a blank section with a certain length;
strongly binding the sheet body: the lower end of the blank section is strongly bundled so that the lower end forms a sheet body, and the upper end of the blank section forms a head;
a step of forming a cylindrical part: will the lower part cold-heading of head becomes the flange dish, just the periphery of flange dish leaves the shaping resistance edge, the shaping resistance edge is conical surface form, the thickness at shaping resistance edge is compared the thickness of flange dish is little, and is right the in-process that the lower part of head carries out the cold-heading will the last part cold-heading of head becomes the cylinder.
Specifically, in the cylindrical portion forming step, the forming resistance edge is inclined outward from top to bottom or from bottom to top.
Specifically, there is a first shaping step between the material breaking step and the intense beam body step, the first shaping step: and cold heading is carried out on the blank section, so that the lower end of the blank section forms a chamfer or a radius.
Specifically, after the cylindrical portion forming step, there is a second shaping step of: and cold heading is carried out on the blank section so as to turn over the forming resistance edge to be horizontal.
Specifically, after the cylindrical portion forming step, there is a remainder cutting step which: and punching off the excess material on the edge of the flange plate.
The utility model provides a be applied to former of forming method, includes cover half and punching tool, the punching tool is equipped with the movable mould, the roof of cover half is equipped with outer convex part, the lateral wall of outer convex part is the conical surface that narrows gradually from bottom to top, calls for first conical surface, the diapire of movable mould is equipped with the concave part, the lateral wall of concave part is the conical surface that narrows gradually from bottom to top, calls for second conical surface, the roof of outer convex part with the roof of concave part is used for the joint molding the ring flange, first conical surface with the second conical surface is used for the joint molding shaping the shaping resistance edge.
The forming equipment applied to the forming method comprises a fixed die and a punching die, wherein the punching die is provided with a movable die, the bottom wall of the movable die is provided with an outer convex part, the side wall of the outer convex part is a conical surface gradually narrowed from top to bottom and is called a first conical surface, the top wall of the fixed die is provided with a concave part, the side wall of the concave part is a conical surface gradually narrowed from top to bottom and is called a second conical surface, the top wall of the outer convex part and the top wall of the concave part are used for jointly forming the flange plate, and the first conical surface and the second conical surface are used for jointly forming the forming resistance edge.
Specifically, the included angles formed by the projections of the first conical surface and the second conical surface on the cross section passing through the axis are both a, and a is more than or equal to 90 degrees and less than or equal to 110 degrees.
Specifically, the included angle formed by the projection of the outline of the cross section passing through the axis of the first conical surface and the second conical surface is a, and a is 100 degrees.
Specifically, when the fixed mold and the movable mold are clamped, a distance between a top wall of the convex portion and a bottom wall of the concave portion is referred to as a first thickness, a distance between the first tapered surface and the second tapered surface is referred to as a second thickness, and when the fixed mold and the movable mold are clamped, the first thickness is larger than the second thickness.
Compared with the prior art, the invention has the beneficial effects that:
in the molding method of the present application, in the cylindrical portion molding step, the molding resistance edge is formed in a conical surface shape, and the thickness of the molding resistance edge is smaller than that of the flange. In the forming process, near the material of ring flange meets great shaping resistance in shaping resistance edge for the lateral flow of near the material of ring flange receives the hindrance, therefore partial material is forced to be changeed and flows to head department along vertical (up), and not along lateral flow direction ring flange department, thereby under the prerequisite that need not to increase ring flange transverse dimension, can realize the shaping of the head of sufficient length, thereby can reduce the marginal clout of ring flange, in order to save material. In addition, as the transverse size of the flange plate does not need to be increased, the forging force required in the cold heading process is also reduced, and therefore, the energy conservation is realized.
For the molding equipment of the application, because the outer convex part is provided with the first conical surface, correspondingly, the concave part is provided with the second conical surface, and when the fixed die and the movable die are assembled, the distance between the top wall of the outer convex part and the bottom wall of the concave part is larger than the distance between the first conical surface and the second conical surface, the thickness of the molding resistance edge is smaller than that of the flange plate. In the forming process, near the material of ring flange meets great shaping resistance in shaping resistance edge for the lateral flow of near the material of ring flange receives the hindrance, therefore partial material is forced to be changeed and flows to head department along vertical (up), and not along lateral flow direction ring flange department, thereby under the prerequisite that need not to increase ring flange transverse dimension, can realize the shaping of the head of sufficient length, thereby can reduce the marginal clout of ring flange, in order to save material. In addition, as the transverse size of the flange plate does not need to be increased, the forging force required in the cold heading process is also reduced, and therefore, the energy conservation is realized.
Drawings
FIG. 1 is a three-dimensional view of a blank section;
FIG. 2 is a partial view of a chamfering station in a first truing step;
FIG. 3 is a three-view illustration of the material after chamfering;
FIG. 4 is a partial view of the rounding station in the first shaping step;
FIG. 5 is a three-dimensional view of the rounded material;
FIG. 6 is a partial view of a sheet step station;
FIG. 7 is a three-view illustration of the material after the sheet-strongly-binding step;
FIG. 8 is a partial view of a station for the cylindrical portion forming step;
FIG. 9 is a front and bottom view of the material after the cylindrical portion forming step;
FIG. 10 is a side and top view of the material after the cylindrical portion forming step;
FIG. 11 is a partial view of a second reforming station;
FIG. 12 is a front and bottom view of the material after a second shaping step;
FIG. 13 is a side and top view of the material after a second shaping step;
FIG. 14 is a partial view of the slug cut out step station;
FIG. 15 is a three-view illustration of the material after the slug removal step;
FIG. 16 is a comparison of the deformation of the material before and after the cylindrical portion forming step.
In the figure: 1. a sheet body; 2. a head portion; 21. a flange plate; 22. forming a resistance edge; 23. a cylinder; 3. an outer convex portion; 31. a first conical surface; 4. a recessed portion; 41. a second tapered surface; 51. trimming a die; 52. a guide strut; 53. trimming and punching a rod; 54. unloading the waste push pipe; 55. a return spring.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
A method for forming a cylindrical part of a sheet body is applied to a square columnar blank, and comprises the following steps:
material breaking step: a length of embryonic stock is cut (as shown in figure 1).
A first shaping step: and cold heading the blank section to form a chamfer or radius at the lower end of the blank section. In this embodiment, the lower end of the preform segment is chamfered (see fig. 1 to 3), and then rounded (see fig. 3 to 5).
Strongly binding the sheet body: referring to fig. 5-7, the lower end of the embryonic section is forcibly bundled so that it forms the sheet 1 and the upper end of the embryonic section forms the head 2.
A step of forming a cylindrical part: referring to fig. 7 to 10, the lower part of the head 2 is cold headed into a flange 21, leaving a profiled resisting edge 22 at the periphery of the flange 21. The shaped resistance edge 22 is conical, and the thickness of the shaped resistance edge 22 is smaller than that of the flange 21. In cold heading the lower part of the head 2, the upper part of the head 2 is cold headed into a cylinder 23 (see fig. 16).
Specifically, as shown in fig. 9 and 10, the shaped resistive edge 22 is inclined from top to bottom and outward, and instead (not shown), the direction of inclination of the shaped resistive edge 22 is opposite to that described above, i.e., from bottom to top and outward.
A second shaping step: referring to fig. 10-13, the stock segment is cold headed to round the top edge of the cylinder 23 and the shaped resistive edge 22 is turned to the horizontal (as shown in fig. 12, 13).
Excess material cutting step: referring to fig. 12 to 15, excess material from the flange plate edge is punched out. Referring to fig. 14, the excess material cutting step includes a trimming die 51, a guide slide 52, a trimming punch 53, a waste discharging push tube 54, a return spring 55, and the like.
In the cylindrical portion forming step, the forming resistance edge 22 is formed in a conical surface shape, and the thickness of the forming resistance edge 22 is smaller than that of the flange 21. The material near the flange 21 meets great forming resistance at the forming resistance edge 22, so that the transverse flow of the material near the flange 21 is blocked, and thus part of the material is forced to flow to the head 2 along the vertical direction (upward) instead of flowing to the flange 21 along the transverse direction, thereby realizing the forming of the head 2 with enough length on the premise of not increasing the transverse size of the flange 21, reducing the edge excess material of the flange 21 and saving the material. In addition, since the transverse dimension of the flange 21 does not need to be increased, the forging force required for the cold heading process is also reduced, thereby achieving energy saving.
A molding apparatus applied to the above molding method, referring to FIG. 8, includes a fixed mold (located at the lower side of FIG. 8) and a punch (located at the upper side of FIG. 8) provided with a movable mold. The top wall of the fixed die is provided with an outer convex part 3, and the side wall of the outer convex part 3 is a conical surface which is gradually narrowed from bottom to top and is called as a first conical surface 31. The bottom wall of the movable mold is provided with a concave part 4, and the side wall of the concave part 4 is a conical surface which gradually narrows from bottom to top and is called a second conical surface 41. The top wall of the male portion 3 and the top wall of the female portion 4 are used for co-molding the flange 21, and the first tapered surface 31 and the second tapered surface 41 are used for co-molding the molded resisting edge 22. Specifically, the included angles formed by the projections of the first conical surface 31 and the second conical surface 41 on the cross section profile of the through axis are all a, and a is more than or equal to 90 degrees and less than or equal to 110 degrees. Preferably, the included angle formed by the projection of the first conical surface 31 and the outline of the cross section of the second conical surface 41 on the through axis is a, and a is 100 °.
Specifically, referring to fig. 8, when the fixed mold and the movable mold are clamped, the distance between the top wall of the male portion 3 and the bottom wall of the recessed portion 4 is referred to as a first thickness, and the distance between the first tapered surface 31 and the second tapered surface 41 is referred to as a second thickness, and when the fixed mold and the movable mold are clamped, the first thickness is greater than the second thickness, and therefore, during the molding of the flange 21 (molding resistance edge 22), the thickness of the molding resistance edge 22 is always smaller than the thickness of the flange 21, and thus the material lateral flow resistance at the position of the molding resistance edge 22 is greater, so that part of the material at the position of the flange 21 is forced to flow in the vertical direction (upward direction) where the resistance is relatively small, to form the cylinder 23.
As an alternative embodiment (not shown, refer to fig. 8), the positions of the convex portion 3 and the concave portion 4 of the molding apparatus are mutually rotated, that is, the bottom wall of the movable mold is provided with the convex portion 3, and the side wall of the convex portion 3 is a tapered surface gradually narrowing from top to bottom, which is called as a first tapered surface 31. The top wall of the fixed die is provided with a concave part 4, and the side wall of the concave part 4 is a conical surface which is gradually narrowed from top to bottom and is called as a second conical surface 41. The top wall of the male portion 3 and the top wall of the female portion 4 are used for co-molding the flange 21, and the first tapered surface 31 and the second tapered surface 41 are used for co-molding the molded resisting edge 22. This alternative embodiment still enables the periphery of the flange 21 to be formed into a shaped resistance edge 22, except that the extension of the shaped resistance edge 22 is opposite to that of the previous embodiment, but the shaped resistance edge 22 in this embodiment also serves to "force a portion of the material at which the flange 21 is located to flow in a relatively low resistance vertical direction (upwards) to form a cylinder 23".
Since the male portion 3 is provided with the first tapered surface 31, accordingly, the female portion 4 is provided with the second tapered surface 41, and when the stationary mold and the movable mold are clamped, the distance between the top wall of the male portion 3 and the bottom wall of the female portion 4 is larger than the distance between the first tapered surface 31 and the second tapered surface 41, so that the thickness of the molding resistance edge 22 is smaller than the thickness of the flange 21. The material near the flange 21 meets great forming resistance at the forming resistance edge 22, so that the transverse flow of the material near the flange 21 is blocked, and thus part of the material is forced to flow to the head 2 along the vertical direction (upward) instead of flowing to the flange 21 along the transverse direction, thereby realizing the forming of the head 2 with enough length on the premise of not increasing the transverse size of the flange 21, reducing the edge excess material of the flange 21 and saving the material. In addition, since the transverse dimension of the flange 21 does not need to be increased, the forging force required for the cold heading process is also reduced, thereby achieving energy saving.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
1. A method for forming a cylindrical part of a sheet body is applied to a square columnar blank, and is characterized by comprising the following steps:
material breaking step: cutting a blank section with a certain length;
strongly binding the sheet body: the lower end of the blank section is strongly bundled so that the lower end forms a sheet body, and the upper end of the blank section forms a head;
a step of forming a cylindrical part: will the lower part cold-heading of head becomes the flange dish, just the periphery of flange dish leaves the shaping resistance edge, the shaping resistance edge is conical surface form, the thickness at shaping resistance edge is compared the thickness of flange dish is little, and is right the in-process that the lower part of head carries out the cold-heading will the last part cold-heading of head becomes the cylinder.
2. The method of forming a cylindrical portion of a sheet according to claim 1, wherein the forming resistance edge is inclined outward from top to bottom or from bottom to top in the cylindrical portion forming step.
3. The method for forming cylindrical portions of a sheet according to claim 1, wherein a first shaping step is present between the step of breaking and the step of strongly bundling the sheet, the first shaping step being: and cold heading is carried out on the blank section, so that the lower end of the blank section forms a chamfer or a radius.
4. The method for forming a cylindrical portion of a sheet according to claim 3, wherein after the cylindrical portion forming step, there is a second shaping step of: and cold heading is carried out on the blank section so as to turn over the forming resistance edge to be horizontal.
5. The method for forming the cylindrical portion of the sheet body according to claim 1, wherein after the cylindrical portion forming step, there is a discard cutting step of: and punching off the excess material on the edge of the flange plate.
6. A molding apparatus applied to the molding method according to claim 1, characterized in that: including the cover half and towards the utensil, it is equipped with the movable mould to dash the utensil, the roof of cover half is equipped with outer convex part, the lateral wall of outer convex part is the conical surface of narrowing gradually from bottom to top, calls for first conical surface, the diapire of movable mould is equipped with the concave part, the lateral wall of concave part is the conical surface of narrowing gradually from bottom to top, calls for second conical surface, the roof of outer convex part with the roof of concave part is used for the joint molding the ring flange, first conical surface with the second conical surface is used for the joint molding shaping the shaping resistance edge.
7. A molding apparatus applied to the molding method according to claim 1, characterized in that: the stamping die comprises a fixed die and a stamping die, wherein the stamping die is provided with a movable die, the bottom wall of the movable die is provided with an outer convex part, the side wall of the outer convex part is a conical surface which is gradually narrowed from top to bottom and called a first conical surface, the top wall of the fixed die is provided with a concave part, the side wall of the concave part is a conical surface which is gradually narrowed from top to bottom and called a second conical surface, the top wall of the outer convex part and the top wall of the concave part are used for jointly forming the flange plate, and the first conical surface and the second conical surface are used for jointly forming the forming.
8. The molding apparatus according to claim 6 or 7, wherein: the included angles formed by the projections of the first conical surface and the second conical surface on the cross section passing through the axis are both a, and a is more than or equal to 90 degrees and less than or equal to 110 degrees.
9. The molding apparatus according to claim 6 or 7, wherein: the included angle formed by the projection of the outline of the cross section passing through the axis of the first conical surface and the second conical surface is a, and a is 100 degrees.
10. The molding apparatus according to claim 6 or 7, wherein: when the fixed die and the movable die are clamped, the distance between the top wall of the outer convex part and the bottom wall of the concave part is called a first thickness, the distance between the first conical surface and the second conical surface is called a second thickness, and when the fixed die and the movable die are clamped, the first thickness is larger than the second thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910768912.6A CN110576133B (en) | 2019-08-20 | 2019-08-20 | Method and equipment for forming cylindrical part of sheet body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910768912.6A CN110576133B (en) | 2019-08-20 | 2019-08-20 | Method and equipment for forming cylindrical part of sheet body |
Publications (2)
| Publication Number | Publication Date |
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| CN110576133A CN110576133A (en) | 2019-12-17 |
| CN110576133B true CN110576133B (en) | 2020-09-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910768912.6A Active CN110576133B (en) | 2019-08-20 | 2019-08-20 | Method and equipment for forming cylindrical part of sheet body |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2618908A1 (en) * | 1976-04-27 | 1977-11-17 | Loewe Gmbh Lodw | Cold forged hinge pin - has oil groove formed over full length and headed and chamfered in two dies |
| JP4067184B2 (en) * | 1998-06-26 | 2008-03-26 | 本田技研工業株式会社 | Shaft disk part forming method |
| CN101020224A (en) * | 2007-03-14 | 2007-08-22 | 重庆大学 | Crankshaft forging die |
| CN201366480Y (en) * | 2009-03-05 | 2009-12-23 | 芜湖三联锻造有限公司 | Semi-closed pre-forming forging and stamping mold |
| CN102152063A (en) * | 2010-11-29 | 2011-08-17 | 宁波安拓实业有限公司 | Process for manufacturing steel bundle terminal blank |
| CN106270332B (en) * | 2015-05-17 | 2018-08-21 | 周满志 | The cold-heading molding method of power pin |
| CN108262437B (en) * | 2018-01-18 | 2024-03-29 | 苏州新凯紧固系统有限公司 | Cold heading forming process and cold heading module for bolt with thin-wall washer |
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2019
- 2019-08-20 CN CN201910768912.6A patent/CN110576133B/en active Active
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Address after: 510000 workshop A1, A2 and A3, No. 9, Weisi Road, Zengjiang street, Zengcheng, Guangzhou, Guangdong Province Patentee after: Shunke Zhilian Technology Co.,Ltd. Address before: 510000 No.9, Weisi Road, high tech Industrial Park, Zengjiang Avenue (East District), Zengcheng District, Guangzhou City, Guangdong Province Patentee before: SANCO NEW ENERGY TECHNOLOGY Co.,Ltd. |
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