CA2614931A1 - Method of forming a circular sheet-metal blank - Google Patents
Method of forming a circular sheet-metal blank Download PDFInfo
- Publication number
- CA2614931A1 CA2614931A1 CA002614931A CA2614931A CA2614931A1 CA 2614931 A1 CA2614931 A1 CA 2614931A1 CA 002614931 A CA002614931 A CA 002614931A CA 2614931 A CA2614931 A CA 2614931A CA 2614931 A1 CA2614931 A1 CA 2614931A1
- Authority
- CA
- Canada
- Prior art keywords
- diameter
- metal blank
- circular
- circular sheet
- blank
- 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.)
- Abandoned
Links
- 239000002184 metal Substances 0.000 title claims abstract description 41
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 7
- 239000002699 waste material Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000009291 secondary effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/28—Making machine elements wheels; discs
-
- 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
- B21D22/14—Spinning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H1/00—Making articles shaped as bodies of revolution
- B21H1/02—Making articles shaped as bodies of revolution discs; disc wheels
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49481—Wheel making
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Forging (AREA)
Abstract
A method of forming a circular sheet-metal blank (1), which has a central hole (2) and rests on a tool (4) rotating about an axis (3) and has a thickness al and a diameter dl which is less than the diameter of the tool (4) is distinguished by the fact that one or more pressure rollers are preferably plunged axially into the material of the circular sheet-metal blank and are moved radially outwards, so that the area of the sheet-metal blank (1) is enlarged radially in all directions, so that a preferably rotationally symmetrical part, in particular a further circular sheet-metal blank having a larger diameter d2 and a thickness a2 reduced at least in sections or throughout, is formed from the circular sheet-metal blank having the initial diameter dl and the thickness al.
Description
METHOD OF FORMING A CIRCULAR SHEET-METAL BLANK
The invention relates to a method of forming a circular sheet-metal blank which has a central hole and rests on a tool rotating about an axis and has a thickness al and a diameter dl which is smaller than the diameter of the tool.
The object of the invention is to adopt new ways of forming circular sheet-metal blanks by means of flow-forming rollers.
The invention achieves this object by the subject matter of claim 1.
In this case, one or more flow-forming rollers are preferably plunged axially into the material of the circular sheet-metal blank and are moved radially outward (this is to be understood in such a way that the path of the flow-forming roller contains at least one component motion in the radial direction), as a result of which the area of the circular sheet-metal blank is enlarged radially in all directions, such that a rotationally symmetrical part, in particular a circular sheet-metal blank having a larger diameter d2 and a thickness a2 reduced at least in sections or throughout, is produced from the circular sheet-metal blank having the initial diameter dl and the thickness al.
Advantageous configurations can be gathered from the subclaims.
By means of the invention, it is possible to produce a circular sheet-metal blank or directly a rotationally symmetrical part, in particular a gear part, having a larger diameter d2 and a thickness a2 reduced at least in sections or throughout, from a circular sheet-metal blank having an initLal diameter dl and a thickness al. It is even possible to increase the diameter by more than 10%, in particular by more than 20%.
The expression "circular sheet-metal blank" must not be considered too narrowly with regard to the part produced by the forming. Firstly, it is possible to produce a flat circular sheet-metal blank. However, said blank may also be contoured if the tool is correspondingly contoured. In addition, the circular sheet-metal blank may be machined or further processed to directly produce a gear part or the like.
The method can be used in a wide variety of sectors. A preferred application is the enlargement of "small" circular sheet-metal blanks, as occur, for example, more or less as waste in the manufacture of wheel disks for trucks, which waste otherwise ought to be scrapped. However, it is also possible with the invention to use the method for another purpose, e.g. for producing wheel disks for smaller utility vehicles. The cost advantage which can be achieved in this way should not be underestimated.
The invention relates to a method of forming a circular sheet-metal blank which has a central hole and rests on a tool rotating about an axis and has a thickness al and a diameter dl which is smaller than the diameter of the tool.
The object of the invention is to adopt new ways of forming circular sheet-metal blanks by means of flow-forming rollers.
The invention achieves this object by the subject matter of claim 1.
In this case, one or more flow-forming rollers are preferably plunged axially into the material of the circular sheet-metal blank and are moved radially outward (this is to be understood in such a way that the path of the flow-forming roller contains at least one component motion in the radial direction), as a result of which the area of the circular sheet-metal blank is enlarged radially in all directions, such that a rotationally symmetrical part, in particular a circular sheet-metal blank having a larger diameter d2 and a thickness a2 reduced at least in sections or throughout, is produced from the circular sheet-metal blank having the initial diameter dl and the thickness al.
Advantageous configurations can be gathered from the subclaims.
By means of the invention, it is possible to produce a circular sheet-metal blank or directly a rotationally symmetrical part, in particular a gear part, having a larger diameter d2 and a thickness a2 reduced at least in sections or throughout, from a circular sheet-metal blank having an initLal diameter dl and a thickness al. It is even possible to increase the diameter by more than 10%, in particular by more than 20%.
The expression "circular sheet-metal blank" must not be considered too narrowly with regard to the part produced by the forming. Firstly, it is possible to produce a flat circular sheet-metal blank. However, said blank may also be contoured if the tool is correspondingly contoured. In addition, the circular sheet-metal blank may be machined or further processed to directly produce a gear part or the like.
The method can be used in a wide variety of sectors. A preferred application is the enlargement of "small" circular sheet-metal blanks, as occur, for example, more or less as waste in the manufacture of wheel disks for trucks, which waste otherwise ought to be scrapped. However, it is also possible with the invention to use the method for another purpose, e.g. for producing wheel disks for smaller utility vehicles. The cost advantage which can be achieved in this way should not be underestimated.
Alternatively, it is possible to directly provide an essentially rotationally symmetrical part of virtually any desired type from a circular blank of larger initial thickness, said part having a region of smaller thickness and a larger diameter. Possible applications also arise in the field of flywheel ring gears. In the case of all these parts, novel solution approaches which considerably reduce, for example, the material scrap and thus the production costs are obtained by means of the invention.
It is certainly known that a circular blank widens somewhat during the plunging of a flow-forming roller, thus during the integral forming of a hub. But the widening is only a secondary effect which leads to the clamping of the circular blank on an abutment chuck. In addition, the circular blank is not moved radially outward but rather radially inward, such that no specific widening, in particular not by more than the percentage specifications mentioned in the subclaims, is effected.
The invention is described in more detail below with reference to the drawing and an exemplary embodiment.
In the drawing:
Fig. 1 shows a circular metal blank as initial workpiece;
and Fig. 2 shows the circular metal blank from Fig. 1 in dot-dash illustration on a tool and in solid lines after the forming.
It is certainly known that a circular blank widens somewhat during the plunging of a flow-forming roller, thus during the integral forming of a hub. But the widening is only a secondary effect which leads to the clamping of the circular blank on an abutment chuck. In addition, the circular blank is not moved radially outward but rather radially inward, such that no specific widening, in particular not by more than the percentage specifications mentioned in the subclaims, is effected.
The invention is described in more detail below with reference to the drawing and an exemplary embodiment.
In the drawing:
Fig. 1 shows a circular metal blank as initial workpiece;
and Fig. 2 shows the circular metal blank from Fig. 1 in dot-dash illustration on a tool and in solid lines after the forming.
Fig. 1 shows a circular sheet-metal blank 1, preferably having a central hole 2, and this circular sheet-metal blank 1, in Fig. 2, rests on a tool 4 (on a spindle, not shown here, of a flow-forming machine) rotatable about an axis 3 and has a thickness al and a diameter dl.
The circular sheet-metal blank 1 is preferably held at the central hole 2. To this end, at least one pin engages in the central hole, if need be in a clamping manner, and a counterholder device 6 which has a larger diameter than the central hole can adjoin said pin 5 on that side of the circular sheet-metal blank which faces away from the tool. The axial length of the pin 5 may be smaller than, just as large as or larger than the thickness dl of the circular sheet-metal blank 1. The circular sheet-metal blank 1 is preferably made of a cast iron or another metal which can be formed by flow forming.
The tool 4 extends radially in all directions beyond the outer circumference of the circular sheet-metal blank 1 with a preferably circular form. It preferably has a flat surface, but may also be of contoured design.
One or more freely rotatable flow-forming rollers 7 are arranged above the circular sheet-metal blank 1 and can also be fed in in superimposed movements at least axially in the direction x of the workpiece and radially in the direction r.
The circular sheet-metal blank 1 is preferably held at the central hole 2. To this end, at least one pin engages in the central hole, if need be in a clamping manner, and a counterholder device 6 which has a larger diameter than the central hole can adjoin said pin 5 on that side of the circular sheet-metal blank which faces away from the tool. The axial length of the pin 5 may be smaller than, just as large as or larger than the thickness dl of the circular sheet-metal blank 1. The circular sheet-metal blank 1 is preferably made of a cast iron or another metal which can be formed by flow forming.
The tool 4 extends radially in all directions beyond the outer circumference of the circular sheet-metal blank 1 with a preferably circular form. It preferably has a flat surface, but may also be of contoured design.
One or more freely rotatable flow-forming rollers 7 are arranged above the circular sheet-metal blank 1 and can also be fed in in superimposed movements at least axially in the direction x of the workpiece and radially in the direction r.
As soon as the tool 4 together with the circular sheet-metal blank 1 has reached a predetermined rotational speed, the flow-forming roller 7 is fed in axially in the direction x at a distance from the outer circumference, preferably close to the central hole or even at the edge of the central hole, in the course of which it plunges into the workpiece. After that, or at the same time, it is moved outward radially in the direction r, such that it presses or pushes the material of the circular sheet-metal blank 1 radially outward ahead of it. In this way, the area of the circular blank 1 is enlarged radially in all directions, and surprisingly without crack formation in the outer circumferential region.
This operation is preferably repeated several times.
A freely rotatable hold-down roller 8 in the outer circumferential region can additionally prevent the circular blank material from arching forwards from the plane of the circular sheet-metal blank 1.
This operation is preferably repeated several times.
A freely rotatable hold-down roller 8 in the outer circumferential region can additionally prevent the circular blank material from arching forwards from the plane of the circular sheet-metal blank 1.
Designations Circular sheet-metal blank 1 Hole 2 Axis 3 Tool 4 Pin 5 Counterholder 6 Flow-forming rollers 7 Hold-down roller 8 Thickness al, a2 Diameter dl, d2
Claims (12)
1. Method of forming a circular sheet-metal blank (1) which rests on a tool (4) rotating about an axis (3) and has a thickness al and a diameter d1 which is smaller than the diameter of the tool (4), characterized in that one or more flow-forming rollers (17) are preferably plunged axially into the material of the circular sheet-metal blank (1) and are moved radially outward, such that the area of the circular sheet-metal blank (1) is enlarged radially in all directions, such that a preferably rotationally symmetrical part, in particular a further circular sheet-metal blank having a larger diameter d2 and a thickness a2 reduced at least in sections or throughout, is formed from the circular sheet-metal blank having the initial diameter d1 and the thickness a1.
2. Method according to Claim 1, characterized in that the circular sheet-metal blank to be formed has a central hole (2).
3. Method according to Claim 1 or 2, characterized in that the circular sheet-metal blank is held on the tool.
4. Method according to Claim 1 or 2, characterized in that the infeed of the at least one flow-forming roller (7) radially from inside to outside is repeated several times.
5. Method according to one of the preceding claims, characterized in that the diameter d2 is larger than the initial diameter d1 by more than 5%.
6. Method according to Claim 5, characterized in that the diameter d2 is larger than the initial diameter d1 by more than 10%.
7. Method according to Claim 6, characterized in that the diameter d2 is larger than the initial diameter d1 by more than 20%.
8. Method according to one of the preceding claims, characterized in that drifting of the circular blank material in the axial direction is prevented by means of one or more freely rotatable hold-down rollers (8).
9. Method according to one of the preceding claims, characterized in that circular metal blanks having a larger diameter than the initial circular blank are produced by the method.
10. Method according to one of the preceding claims, characterized in that waste parts or waste circular blanks in wheel tire production are processed by the method.
11. Method according to one of the preceding claims, characterized in that gear parts having a larger diameter than the initial circular blank are produced by the method.
12. Method according to one of the preceding claims, characterized in that flywheel ring gears having a larger diameter than the initial circular blank are produced by the method.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102005035229 | 2005-07-25 | ||
| DE102005035229.4 | 2005-07-25 | ||
| DE102005035519.6 | 2005-07-26 | ||
| DE102005035519A DE102005035519A1 (en) | 2005-07-25 | 2005-07-26 | Method for forming a sheet metal blank |
| PCT/EP2006/006105 WO2007012367A1 (en) | 2005-07-25 | 2006-06-24 | Method of forming a circular sheet-metal blank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2614931A1 true CA2614931A1 (en) | 2007-02-01 |
Family
ID=37192363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002614931A Abandoned CA2614931A1 (en) | 2005-07-25 | 2006-06-24 | Method of forming a circular sheet-metal blank |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US20090211323A1 (en) |
| EP (1) | EP1909985B1 (en) |
| JP (1) | JP2009502508A (en) |
| KR (1) | KR20080026192A (en) |
| CA (1) | CA2614931A1 (en) |
| DE (1) | DE102005035519A1 (en) |
| ES (1) | ES2484800T3 (en) |
| PL (1) | PL1909985T3 (en) |
| WO (1) | WO2007012367A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1026796C2 (en) * | 2004-08-06 | 2006-02-07 | Fontijne Grotnes B V | Method and device for manufacturing a rim ring by means of cold deformation. |
| CN101966555A (en) * | 2009-07-28 | 2011-02-09 | 上海兴浦旋压车轮有限公司 | Wheel rolling and molding method |
| CN104759851A (en) * | 2015-04-07 | 2015-07-08 | 常州龙之合飞轮总成系统有限公司 | Novel formation process of flywheel of engine |
| CN114042843A (en) * | 2021-11-09 | 2022-02-15 | 常州和仕达机械装备制造有限公司 | Horizontal rolling process and forming device for special-shaped ring piece |
| CN114042844A (en) * | 2021-11-09 | 2022-02-15 | 常州和仕达机械装备制造有限公司 | Horizontal rolling forming device for special-shaped ring piece |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD236824A1 (en) * | 1985-04-30 | 1986-06-18 | Karl Marx Stadt Haushaltgeraet | METAL PRESSURE PROCESS FOR THE PRODUCTION OF PUNCHING CUPS |
| DD283088A5 (en) * | 1989-05-16 | 1990-10-03 | Karl Marx Stadt Haushaltgeraet | METHOD FOR PRODUCING ROUND-KNIFE CUTTING |
| DE19524089C1 (en) * | 1995-07-01 | 1996-09-05 | Wf Maschinenbau Blechformtech | Method of mfg. gear part of thin metal disc |
| DE10033239A1 (en) * | 2000-07-10 | 2002-01-24 | Wf Maschinenbau Blechformtech | Method to manufacture adjusting disc for infinitely variable change speed gear with conical part formed by forging or turning of round metal blank |
| DE10108498C1 (en) * | 2001-02-22 | 2002-08-22 | Wf Maschinenbau Blechformtech | Device for the non-cutting production of a shaped body having a concentric hub |
| DE10160038C1 (en) * | 2001-12-06 | 2003-03-13 | Winkelmann & Pannhoff Gmbh & C | Rotary-symmetrical component manufacturing process, for making gears, involves reducing thickness of disk-shaped hub region, displacing material to increase external diameter |
| EP1697066B1 (en) * | 2003-11-17 | 2008-01-02 | Wf-Maschinenbau Und Blechformtechnik Gmbh & Co. Kg | Method for the production of a flange on a circular sheet metal blank |
-
2005
- 2005-07-26 DE DE102005035519A patent/DE102005035519A1/en not_active Withdrawn
-
2006
- 2006-06-24 KR KR1020087001823A patent/KR20080026192A/en not_active Application Discontinuation
- 2006-06-24 ES ES06762175.5T patent/ES2484800T3/en active Active
- 2006-06-24 EP EP06762175.5A patent/EP1909985B1/en not_active Revoked
- 2006-06-24 CA CA002614931A patent/CA2614931A1/en not_active Abandoned
- 2006-06-24 PL PL06762175T patent/PL1909985T3/en unknown
- 2006-06-24 WO PCT/EP2006/006105 patent/WO2007012367A1/en active Application Filing
- 2006-06-24 US US11/988,814 patent/US20090211323A1/en not_active Abandoned
- 2006-06-24 JP JP2008523151A patent/JP2009502508A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE102005035519A1 (en) | 2007-02-01 |
| EP1909985A1 (en) | 2008-04-16 |
| JP2009502508A (en) | 2009-01-29 |
| WO2007012367A1 (en) | 2007-02-01 |
| US20090211323A1 (en) | 2009-08-27 |
| KR20080026192A (en) | 2008-03-24 |
| EP1909985B1 (en) | 2014-04-30 |
| ES2484800T3 (en) | 2014-08-12 |
| PL1909985T3 (en) | 2014-12-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |