GB2341571A - Blank cutting for press tool - Google Patents
Blank cutting for press tool Download PDFInfo
- Publication number
- GB2341571A GB2341571A GB9820091A GB9820091A GB2341571A GB 2341571 A GB2341571 A GB 2341571A GB 9820091 A GB9820091 A GB 9820091A GB 9820091 A GB9820091 A GB 9820091A GB 2341571 A GB2341571 A GB 2341571A
- Authority
- GB
- United Kingdom
- Prior art keywords
- stock material
- tool
- press
- panel
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
- B26F1/38—Cutting-out; Stamping-out
- B26F1/384—Cutting-out; Stamping-out using rotating drums
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D19/00—Shearing machines or shearing devices cutting by rotary discs
- B23D19/04—Shearing machines or shearing devices cutting by rotary discs having rotary shearing discs arranged in co-operating pairs
- B23D19/06—Shearing machines or shearing devices cutting by rotary discs having rotary shearing discs arranged in co-operating pairs with several spaced pairs of shearing discs working simultaneously, e.g. for trimming or making strips
- B23D19/065—Shearing machines or shearing devices cutting by rotary discs having rotary shearing discs arranged in co-operating pairs with several spaced pairs of shearing discs working simultaneously, e.g. for trimming or making strips for cutting along lines not parallel to the longitudinal direction of the material, e.g. oblique or zig-zag cutting
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
In known press tools, the press members which carry the cutting blades act in a reciprocal manner. In use, a stock material is indexed into position, halted, cut and moved on. In the press tool of the present invention, the cutting blades are mounted on rotating cylinders which allows for faster processing of a coil of stock material. Also, because the improved press tool processes the stock material as it is fed from the coil there is no need to provide measures to deal with accumulating slack which can be a problem for press tools which act in a reciprocating manner. Cylinders 12, 22 are provided with complementary cutting blades 18, 28. Sheet stock 2 is fed in direction A between the contra-rotating cylinders and cut by the blades to form blank 4.
Description
2341571 - 1 Improved Press Tool The present invention relates to a panel
blanking tool, to a press tool incorporating the panel blanking tool and to a method of producing a panel blank. The present invention has particular, but not exclusive, utility in the automotive industry.
It is known to produce a panel blank for use in the construction of a motor vehicle by stamping a blank from a stock material fed to a press tool.
The stock material is uncoiled from a coil of stock material and fed through a straightening apparatus to the press tool. A leading edge of the stock material is fed to a predetermined position within the press tool and held at this position while the blanking operation is performed. The stock material continues to be fed from the coil of stock material during the blanking operation and backs up to form a region of slack stock material. For this reason, it is necessary to construct a pit between the coil and the stamping machine into which the slack stock material produced while the blanking operation is performed may accumulate and be stored It is clear that the construction of the pit is a time consuming and expensive operation. However it is necessary that the straightening apparatus operate continuously for each coil of stock. It would be a greater expense and inconvenience to stop and restart the straightemng apparatus every time a fresh length of stock material was required from the coiled stock at the press tool.
It will further be appreciated that a large proportion of the time of each cycle of the blanking operation is taken up with raising the upper press member, moving the leading edge of the stock material into position, stopping the stock material and holding it in that position, driving the upper press member downwards and removing the cut blank and scrap from the press tool. It is a problem that only a very small proportion of the time each cycle of the blanking operation is taken actually cutting the blank form the stock material.
It is an advantage that this problem, along with others noted below, is reduced or at least substantially overcome by the use of the present invention.
According to a first aspect of the present invention, a panel blanking tool is characterised in that it comprises a cylindrical member having a peripheral surface, the peripheral surface being provided with at least one cutting blade defining a shape of a blank to be cut According to a second aspect of the present invention a press tool comprises an upper press member and a lower press member, characterised in that the upper press member and the lower press member each comprise a panel blanking tool according to the first aspect of the invention, in which the or each cutting blade on the lower press member is complementary to the or each cutting blade formed on the upper press member.
According to a third aspect of the present invention a method of producing a panel blank comprises the steps of providing a stock material having a leading edge, providing a press tool according to the second aspect of the invention, and feeding the leading edge of the stock material into the press tool, in which rotation of the panel blanking tools produces a panel blank from the stock material.
The invention will now be described, by way of example only, with reference to the accompanying drawings in which:
Figure 1 shows a perspective view of a pair of panel blanking tools according to the present invention; Figure 2 shows a projected view of a peripheral surface of one of the panel blanking tools of Figure 1; and Figure 3 shows a schematic view of a production line including a press tool according to the present invention.
Referring first to Figure 1 there is shown an upper panel blanking tool 10 and a lower panel blanking tool 20, each panel blanking tool being in accordance with a first aspect of the present invention.
The upper panel blanking tool 10 comprises a first cylindrical member 12, such as a drum, having a first peripheral surface 14. The first cylindrical member 10 is mounted to be driven in a clockwise direction about a first shaft 16. A first cutting blade 18 in a shape of a panel to be cut is provided on the first peripheral surface 14 (Figure 2). The first cutting blade 18 is constructed by the use of the hard edge weld system.
The lower panel blanking tool 20 comprises a second cylindrical member 22, such as a drum, having a second peripheral surface 24. The second cylindrical member 20 is mounted to be driven in a anticlockwise direction about a second shaft 26. A second cutting blade 28, complementary to the first cutting blade 18, is provided on the second peripheral surface 24. The second cutting blade 28 is also constructed by the use of the hard edge weld system.
The upper blanking tool 10 and the lower panel blanking tool 20 are disposed vertically in relation to one another, with the first cutting blade 18 slightly offset from the second cutting blade 28. The upper blanking tool 10 and the lower blanking tool 20 are connected for synchronous rotation.
Referring also to Figure 3, in use a sheet stock material 2 is fed from a coil 6 of stock material, through a straightening apparatus 8 and between the upper blanking tool 10 and the lower blanking tool 20 of a press tool in the direction of arrow A. As the sheet stock material 2 is fed between the blanking tools, the first cutting blade 18 and the second cutting blade 28 are brought to bear on the stock material 2.
In the known stamping process described above, it is necessary to apply sufficient force across the whole edge of the blade to puncture the stock material. The present invention has the advantage that such force need only be applied at the cutting edge ofthe cutting blade in contact with the stock material 2 at any one time. Accordingly, a much reduced force is needed to be provided in order to cut a similar blank.
As the upper blanking tool 10 and the lower blanking tool 20 continue to rotate, the stock material will feed out from between the tools (not shown in Figure 1 for reasons of clarity) and be fed to an area where it may be disposed of as scrap, for example by being returned to the supplier who may melt it down for subsequent re-use. In the meantime, a cut blank 4 will also be fed out from between the tools (arrow B). The blank 4 may be fed to a flight of rollers or other stock support to be carried to a subsequent workstation.
By means of a suitable modification, the production of perforated blanks is possible. This is achieved by the use of further pairs of complimentary cutting edges formed on the peripheral surfaces of the blanking tools. In operation, the stock is fed from a coil and through the blanking tools. The stock material surrounding the cut blank is taken away as before. The cut blank is again fed away on a flight of rollers or other stock support. A gap is provided either between the blanking tools and the stock support or in the stock support. The gap is of a suitable size for the stock located within the perforations to fall through the gap and into a suitable container located in an appropriate position to collect this stock material for further processing.
It will be understood that a press tool according to the present invention is able to process a coil of stock material in a continuous manner producing more panel blanks from a coil of stock material in a given period of time. There is no need to feed the stock to a predetermined position, halt the stock material, stamp the stock material, wait for the press tool to provided clearance for the stock to move once more, restart the movement of the stock and halt it again. Accordingly there are no parts that act to brake the movement of the stock material which will become worn and require replacing.
Also, because the stock is not being halted within the press tool there is no backing up of the stock material to create any slack. Accordingly, there is the need to construct a pit adjacent the press tool of the present invention into which such slack may accumulate if removed.
Claims (6)
1. A panel blanking tool comprising cylindrical member having a peripheral surface, the peripheral surface being provided with at least one cutting blade defining a shape of a blank to be cut.
2. A panel blanking tool substantially as described herein with reference to and as illustrated in Figures 1 and 2 of the accompanying drawings.
3. A press tool comprising an upper press member and a lower press member, characterised in that the upper press member and the lower press member comprise a panel blanking tool according to either claim 1 or claim 2 in which the or each cutting blade on the lower press member is complementary to the or each cutting blade formed on the upper press member.
4. A press tool substantially as described herein.
5. A method of producing a panel blank comprising the steps of providing a stock material having a leading edge, providing a press tool according to either claim 3 or claim 4, and feeding the leading edge of the stock material into the press tool, in which rotation of the panel blanking tool produces a panel blank from the stock materiaL
6. A method of producing a panel blank substantially as described herein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9820091A GB2341571A (en) | 1998-09-16 | 1998-09-16 | Blank cutting for press tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9820091A GB2341571A (en) | 1998-09-16 | 1998-09-16 | Blank cutting for press tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9820091D0 GB9820091D0 (en) | 1998-11-11 |
| GB2341571A true GB2341571A (en) | 2000-03-22 |
Family
ID=10838903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9820091A Withdrawn GB2341571A (en) | 1998-09-16 | 1998-09-16 | Blank cutting for press tool |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2341571A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1113305A (en) * | 1965-03-26 | 1968-05-15 | Zdarske Strojirny A Slevarny | Improvements in and relating to rotary shearing cutters |
| GB1150779A (en) * | 1965-11-26 | 1969-04-30 | Harris Intertype Corp | Sheet Material Handling Apparatus |
| GB1245444A (en) * | 1967-10-18 | 1971-09-08 | Angelo Bartesaghi | A method and apparatus for producing self-adhesive labels |
| GB1485111A (en) * | 1975-04-07 | 1977-09-08 | Constr Mec De Creil Soc D | Rotary shear |
| EP0193693A1 (en) * | 1985-03-04 | 1986-09-10 | Mitsubishi Jukogyo Kabushiki Kaisha | Rotary drum shear |
| GB2196573A (en) * | 1986-10-24 | 1988-05-05 | Emerson Electric Co | Ultrasonic apparatus for joining and severing sheet material |
| US5088367A (en) * | 1990-07-30 | 1992-02-18 | Zerand-Bernal Group, Inc. | Rotary die with adjustable blade segment |
| WO1992008584A1 (en) * | 1990-11-09 | 1992-05-29 | Rosemann Richard R | Rotary cutting die assembly |
| GB2252743A (en) * | 1991-02-14 | 1992-08-19 | Lanfor Limited | Method of producing a rotary cutting die |
| US5151636A (en) * | 1990-03-12 | 1992-09-29 | Winebarger Kennith N | Rotary die cutting apparatus and method with disconnect |
-
1998
- 1998-09-16 GB GB9820091A patent/GB2341571A/en not_active Withdrawn
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1113305A (en) * | 1965-03-26 | 1968-05-15 | Zdarske Strojirny A Slevarny | Improvements in and relating to rotary shearing cutters |
| GB1150779A (en) * | 1965-11-26 | 1969-04-30 | Harris Intertype Corp | Sheet Material Handling Apparatus |
| GB1245444A (en) * | 1967-10-18 | 1971-09-08 | Angelo Bartesaghi | A method and apparatus for producing self-adhesive labels |
| GB1485111A (en) * | 1975-04-07 | 1977-09-08 | Constr Mec De Creil Soc D | Rotary shear |
| EP0193693A1 (en) * | 1985-03-04 | 1986-09-10 | Mitsubishi Jukogyo Kabushiki Kaisha | Rotary drum shear |
| GB2196573A (en) * | 1986-10-24 | 1988-05-05 | Emerson Electric Co | Ultrasonic apparatus for joining and severing sheet material |
| US5151636A (en) * | 1990-03-12 | 1992-09-29 | Winebarger Kennith N | Rotary die cutting apparatus and method with disconnect |
| US5088367A (en) * | 1990-07-30 | 1992-02-18 | Zerand-Bernal Group, Inc. | Rotary die with adjustable blade segment |
| WO1992008584A1 (en) * | 1990-11-09 | 1992-05-29 | Rosemann Richard R | Rotary cutting die assembly |
| GB2252743A (en) * | 1991-02-14 | 1992-08-19 | Lanfor Limited | Method of producing a rotary cutting die |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9820091D0 (en) | 1998-11-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |