CN110049832B - Press tool for forming a flange by bending - Google Patents
Press tool for forming a flange by bending Download PDFInfo
- Publication number
- CN110049832B CN110049832B CN201780075555.4A CN201780075555A CN110049832B CN 110049832 B CN110049832 B CN 110049832B CN 201780075555 A CN201780075555 A CN 201780075555A CN 110049832 B CN110049832 B CN 110049832B
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- CN
- China
- Prior art keywords
- recess
- tool
- flange
- blank
- forming
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
- B21D22/04—Stamping using rigid devices or tools for dimpling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D19/00—Flanging or other edge treatment, e.g. of tubes
- B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
- B21D19/088—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws for flanging holes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/24—Perforating, i.e. punching holes
- B21D28/26—Perforating, i.e. punching holes in sheets or flat parts
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Forging (AREA)
Abstract
A tool (2) on a press for forming a flange on a blank (4) provided with holes, the tool (2) comprising: a lower portion (6) forming a receiving surface (8) for receiving the slabs; an upper portion (10) able to press the slabs (4) against the receiving surface (8); a punch (14) capable of forming a flange (32) around the hole (12), the punch (14) being an integral part of the receiving surface (8). The receiving surface (8) forms a recess (16) around the punch (14) which, when pressed by the upper portion (10), allows the portion of the blank (4) located around the hole to move downwards.
Description
Technical Field
The present invention relates to the field of forming flanges on a sheet blank by stamping.
Background
The flange is typically formed around the hole in the blank by a press tool that includes a punch mounted on the lower frame of the press. Thus, when the upper frame is moved downwardly, the forming of the flange is achieved by moving the blank downwardly towards the punch, or by a cam system configured to move the punch upwardly towards the blank.
However, the punching tool requires the use of a system for moving the punch upward or for moving the slab downward, which complicates the tool and increases the manufacturing cost of the flange.
The published patent document US 5,069,051 discloses a punching tool for realising a threaded flange. The flange is formed on the slab in advance through four steps. The flange is then placed on the receiving surface of the tool. The tool includes an upper die having a groove configured to laterally compress a flange and a threaded rod located on a lower portion of the tool opposite the flange. When the upper mould is down, the receiving surface comprising the flange is driven down and the groove will cover the flange. The flange translates along a threaded rod located above the flange. When the flange is lifted, the rod will be threaded on the inner surface of the flange.
Published patent document DE 102008031050 a1 discloses a method of forming a flange on a stamped part. The flange is manufactured in several steps on a wire-type cutting tool. The method comprises eight steps, in particular an embossing step, known as embossing, of the punched part made in three steps, so as to obtain a dome shape. Then, a punching step is performed to form a hole in the dome shape. The dome shape is then deformed in several steps in order to obtain the desired flange. Threads are then made on the inside of the flange.
The above-described prior art method of implementing the flange includes a plurality of steps for forming the flange, thereby complicating the method of forming the flange.
Disclosure of Invention
The present invention aims to overcome at least one of the above-mentioned drawbacks of the prior art. More specifically, the present invention aims to provide a tool for a press that allows the flange to be manufactured in a simplified manner. The invention also aims to provide an economical and robust solution.
The invention relates to a tool on a press for forming a flange on a blank provided with a hole, comprising: a lower portion forming a receiving surface for receiving a slab; an upper portion capable of pressing the slab against a receiving surface; a punch capable of forming a flange around a hole. The invention is characterized in that the punch is an integral part of a receiving surface which forms a recess around the punch, which recess, when pressed by the upper part, allows the part of the blank located around the hole to move downwards.
As an integral part of the receiving surface, the punch is fastened with respect to the lower part, advantageously integral with this part.
According to an advantageous embodiment of the invention, the receiving surface for receiving the slab comprises an annular portion surrounding the recess, the height of which is greater than or equal to the height of the punch.
According to an advantageous embodiment of the invention, the upper part of the tool comprises a sheet-like body (dome) configured to press the part of the slab located around the hole into the recess around the punch.
According to an advantageous embodiment of the invention, the wafer comprises a contact surface in contact with the slab, having a protruding profile presenting a circular ring shape, able to enter the recess and forming a central cavity able to receive the punch.
According to an advantageous embodiment of the invention, the upper part of the tool comprises a blank holder arranged around the sheet-like body, which blank holder is configured to press the slab against the receiving surface beside the recess.
According to an advantageous embodiment of the invention, the receiving surface for receiving the slab, outside the annular portion around the recess, has a non-rectilinear profile cooperating with the blank holder.
According to an advantageous embodiment of the invention, the recess is a first recess, the non-rectilinear profile cooperating with the blank holder forming a second recess surrounding the first recess.
According to an advantageous embodiment of the invention, the recess has a side surface which is inclined at an angle of between 40 ° and 55 ° with respect to the horizontal.
The invention also relates to a method for forming the plate blank, which comprises the following steps: punching the plate blank to form a hole on the plate blank and form a flange around the hole; characterized in that the step of forming the flange is carried out by means of a tool according to the invention.
According to an advantageous embodiment of the invention, the diameter of the punch is greater than the diameter of the hole of the slab.
The attraction of the measures of the invention is that they allow to simplify the process of forming the flange on the slab provided with holes. In fact, the receiving surface for receiving the slab, located at the lower part of the tool of the invention, forms a recess around the punch, allowing a flange to be formed around the punch in the direction of movement of the press, i.e. vertically downwards. The present invention allows the flange to be formed by a single press and also allows the cam motion transmission system to be eliminated. Furthermore, the presence of the recess around the punch will allow a specific shape to be obtained on the slab around the flange, which will also allow the stiffness of the slab to be reinforced. Reducing the time and cost of manufacturing the flange.
Drawings
Other features and advantages of the present invention will be better understood with the aid of the description and the accompanying drawings, in which:
fig. 1 shows a tool for forming a flange on a slab according to the invention;
figure 2 shows an enlarged portion of the slab-receiving surface of the tool of figure 1;
figure 3 shows the tool of figure 1 in a step of forming the flange;
figure 4 shows a portion of a slab with a flange formed by the tool of figures 1 and 3.
Detailed Description
Fig. 1 shows a tool 2 for shaping a flange on a slab 4 according to the invention, and fig. 2 shows an enlarged portion of the tool of fig. 1. The tool 2 is used on a press. The tool 2 comprises a lower portion 6 and an upper portion 10, the lower portion 6 forming a receiving surface 8 for receiving the slab 4, the upper portion 10 being able to press the slab 4 against the receiving surface 8. The upper part 10 is configured to move in the machine direction of the press, i.e. downwards. The blank 4 has previously been subjected to a punching step, followed by a punching step of the holes 12 on the blank 4. The holes 12 are shown in dashed lines in fig. 2. The stamped sheet blank 4, such as shown in fig. 1 and 2, has a particular stamped shape, which is not a limitation of the present invention.
The tool 2 further comprises a punch 14 for forming a flange (not shown). The punch 14 of the tool 2 is an integral part of the receiving surface 8 for receiving the slab. The receiving surface 8 for receiving the blank 4 is characterized in that a recess 16 is formed around the punch 14. Preferably, the recess 16 is circular. The recess 16 allows the portion 18 of the blank to be moved downwards when the upper portion 10 of the tool 2 is pressed, the portion 18 of the blank being located around the hole 12 of the blank 4.
The blank 4 is placed on a receiving surface 8 for receiving the blank so that the hole 12 of the blank is arranged above the punch 14. The punch 14 has a diameter greater than the bore 12 so as to allow extrusion of the flange. The upper portion 10 of the tool 2 comprises a lamina 20 configured to press a portion 18 of the blank 4 located around the hole 12 into the recess 16 around the punch 14. More specifically, the lamina 20 comprises a contact surface 21 in contact with the slab 4, which contact surface 21 has a projecting profile presenting a circular ring shape and is able to enter the recess 16. The contact surface 21 of the sheet in contact with the blank 4 also forms a central cavity able to receive the punch 14.
The upper part 10 comprises a blank holder 22 arranged around the wafer 20. The blank holder 22 will hold the blank 4 before the action of the sheet-like body 20.
The receiving surface 8 comprises an annular portion 24 surrounding the recess 16. The height of the annular portion 24 is greater than or equal to the height of the punch 14. Preferably, the height of the annular portion 24 is greater than the height of the punch 14. It is further preferred that the difference in height between the annular portion 24 and the punch 14 is between 1.5mm and 3 mm.
The recess 16 has an upper diameter and a lower diameter, preferably the lower diameter is 1.5 times smaller than the upper diameter. The upper and lower diameters are related to the machine direction of the press, i.e. from high to low, respectively. The recess 16 has a side surface 26 which is inclined at an angle of between 40 ° and 55 ° to the horizontal. The recess 16 also has a bottom 28 which is between 4mm and 6mm wide around the punch 14.
According to an advantageous embodiment of the invention, the receiving surface 8 for receiving the slabs has a non-rectilinear profile outside the annular portion 24. The non-linear profile cooperates with the blank holder 22. Advantageously, the non-rectilinear profile cooperating with the blank holder forms a second recess 30, this second recess 30 surrounding the first recess 16.
Fig. 3 shows the tool 2 of fig. 1 in a step of shaping the flange. The sheet 20 is pressed down against the blank 4 in order to press the blank into the recess 16. The contact surface 21 of the sheet 20 presses the portion of the blank around the hole into the recess 16 and around the punch 14, allowing a flange 32 to be formed around the hole. The flange 32 points upwards.
Fig. 4 shows a top view of the blank 4 after forming the flange 32 around the hole 12. Due to the presence of the recess on the tool of the invention, the slab 4 comprises a shape 34 surrounding the flange 32. The shape 34 has the advantage of stiffening the slab.
The tool and method of the present invention may be used, for example, to form a flange on a slab to lock a bracket of a hood of a motor vehicle configured to hold the hood in an open position.
Claims (9)
1. A tool (2) on a press for shaping a flange (32) on a blank (4) provided with a hole (12), the tool (2) comprising:
-a lower portion (6) forming a receiving surface (8) for receiving the slab;
-an upper portion (10) able to press the slab (4) against the receiving surface (8); and
-a punch (14) capable of forming the flange (32) around the hole (12), the punch (14) being an integral part of the receiving surface (8),
the receiving surface (8) forms a recess (16) around the punch (14), which recess, when pressed by the upper portion (10), allows a portion (18) of the blank located around the hole (12) to move downwards, characterized in that the receiving surface (8) of the blank (4) comprises an annular portion (24) around the recess (16), the height of the annular portion (24) being greater than or equal to the height of the punch (14).
2. Tool (2) according to claim 1, characterized in that the upper part of the tool (2) comprises a wafer (20) configured to press a portion (18) of the sheet blank located around the hole (12) into the recess around the punch.
3. Tool (2) according to claim 2, characterized in that said wafer (20) comprises a contact surface (21) in contact with said slab (4), having a protruding profile presenting a circular shape, able to enter said recess (16) and forming a central cavity able to receive said punch (14).
4. Tool (2) according to any one of claims 2 or 3, characterized in that the upper part (10) of the tool (2) comprises a blank clamp (22) arranged around the sheet-like body (20), the blank clamp (22) being configured to press the slab (4) against the receiving surface (8) beside the recess (16).
5. Tool (2) according to claim 4, characterized in that outside the annular portion (24) around the recess (16) the receiving surface (8) for receiving the slab (4) has a non-rectilinear profile cooperating with the slab clamping element (22).
6. Tool (2) according to claim 5, characterized in that the recess (16) is a first recess, the non-rectilinear profile cooperating with the blank holder (22) forming a second recess (30) surrounding the first recess (16).
7. Tool (2) according to claim 1, characterized in that the recess (16) has a side surface (26) which is inclined at an angle between 40 ° and 55 ° with respect to the horizontal.
8. A method of forming a slab (4), comprising the steps of:
a. -stamping the sheet blank (4);
b. -forming a hole (12) in the blank (4);
c. forming a flange (32) around the hole (12)
Characterized in that said step of forming said flange (32) is carried out by means of a tool (2) according to any one of claims 1 to 7.
9. Method according to claim 8, characterized in that the diameter of the punch (4) is greater than the diameter of the hole (12) of the slab (4).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1661921 | 2016-12-05 | ||
| FR1661921A FR3059576B1 (en) | 2016-12-05 | 2016-12-05 | PRESS TOOLS FOR FORMING A COLLET BY FILLING |
| PCT/FR2017/053093 WO2018104603A1 (en) | 2016-12-05 | 2017-11-13 | Press equipment for forming a collar by trimming |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110049832A CN110049832A (en) | 2019-07-23 |
| CN110049832B true CN110049832B (en) | 2021-03-19 |
Family
ID=57796714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780075555.4A Active CN110049832B (en) | 2016-12-05 | 2017-11-13 | Press tool for forming a flange by bending |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3548198B1 (en) |
| CN (1) | CN110049832B (en) |
| FR (1) | FR3059576B1 (en) |
| WO (1) | WO2018104603A1 (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2348875A (en) * | 1943-06-11 | 1944-05-16 | Charles L Beard | Punch and die |
| US5069051A (en) * | 1990-09-07 | 1991-12-03 | California Industrial Products, Inc. | Method and apparatus for forming threads on a sleeve inner wall |
| JP3777367B2 (en) * | 2003-06-23 | 2006-05-24 | 日高精機株式会社 | Manufacturing method of fin for heat exchanger and mold apparatus thereof |
| JP2007175761A (en) * | 2005-12-28 | 2007-07-12 | Seiko Epson Corp | Shaft hole forming method |
| DE102008031050A1 (en) | 2008-07-01 | 2010-01-07 | Trw Automotive Gmbh | Attachment piece producing method for attaching seat belt retractor to motor vehicle, involves back-pressing pressed section to form case-like attachment piece, and calibrating attachment piece with respect to height and diameter of piece |
| DE102009038607A1 (en) * | 2009-08-26 | 2011-03-31 | Tox Pressotechnik Gmbh & Co. Kg | Apparatus, method and tool for producing a collar pass in a component |
| CN102527759A (en) * | 2010-12-14 | 2012-07-04 | 深圳亿和模具制造有限公司 | Hole flanging method and die for forming high flange on thin plate |
| JP6006656B2 (en) * | 2012-05-28 | 2016-10-12 | 東プレ株式会社 | Method for forming hot pressed product and method for producing hot pressed product |
-
2016
- 2016-12-05 FR FR1661921A patent/FR3059576B1/en active Active
-
2017
- 2017-11-13 EP EP17808553.6A patent/EP3548198B1/en active Active
- 2017-11-13 CN CN201780075555.4A patent/CN110049832B/en active Active
- 2017-11-13 WO PCT/FR2017/053093 patent/WO2018104603A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| FR3059576A1 (en) | 2018-06-08 |
| FR3059576B1 (en) | 2019-06-07 |
| CN110049832A (en) | 2019-07-23 |
| EP3548198A1 (en) | 2019-10-09 |
| EP3548198B1 (en) | 2020-08-05 |
| WO2018104603A1 (en) | 2018-06-14 |
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