US20050229669A1 - Multi-ram press and method of metal forming - Google Patents
Multi-ram press and method of metal forming Download PDFInfo
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- US20050229669A1 US20050229669A1 US11/109,005 US10900505A US2005229669A1 US 20050229669 A1 US20050229669 A1 US 20050229669A1 US 10900505 A US10900505 A US 10900505A US 2005229669 A1 US2005229669 A1 US 2005229669A1
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 229910052751 metal Inorganic materials 0.000 title description 11
- 239000002184 metal Substances 0.000 title description 11
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000003825 pressing Methods 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 230000005483 Hooke's law Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012549 training Methods 0.000 description 1
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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
-
- 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
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/01—Bending sheet metal along straight lines, e.g. to form simple curves between rams and anvils or abutments
Definitions
- the present invention relates to metal forming, and, more particularly, to the forming of a reflector or reflector housing of a light fixture.
- Hooke's law which states, in its simplest form, that stress is proportional to strain where stress is the force per unit area in a body and strain is the axial deformation per unit length of the same body.
- Hooke's law describes the elastic region of the stress-strain curve associated with a particular steel where a steel body at normal temperature regains its original shape, or springs-back, upon the removal of the stress causing load.
- Hooke's law holds up to a point where the material becomes plastic (the point where the deformation (strain) of the material is unrecovered) and this point is called yield tensile strength.
- the plastic region terminates at the ultimate tensile strength of a material which is the limit stress at which the material actually breaks.
- the maximum allowable tensile stress at any point in the construction is 2 ⁇ 3 of the yield strength of the particular steel in order to provide a margin of safety relative to potential fracture of the material.
- a disadvantage of this apparatus is that it is complicated by requiring center plates which move vertically and outer plates which move horizontally.
- Another known metal forming system includes multiple die forming stations in order to achieve a required final shape of the formed part. Disadvantages of this kind of system include a high capital cost for the multiple die forming stations, increased manufacturing cycle time required by the transferring of the formed part to the multiple stations, and a potential for quality problems in the formed part due to the additional handling and multiple die forming stations.
- the present invention provides a single station method of forming a reflector or reflector housing of a light fixture, or other formed parts, which effectively eliminates spring-back in the formed part.
- the invention comprises, in one form thereof, a method of forming a workpiece, including the steps of: providing a center ram, a first outside ram, a second outside ram, and a die; pressing the center ram against the workpiece and toward the die to a first predetermined die depth; trapping the workpiece between the center ram and the die; pressing the first outside ram and the second outside ram against the workpiece and toward the die to a second predetermined die depth; and stretching the workpiece beyond a yield tensile strength of the workpiece material.
- the die includes a die surface which has a first arcuate surface, a first planar surface and a second arcuate surface, where the first planar surface is interposed between the first arcuate surface and the second arcuate surface.
- the die surface has a die center surface which includes at least part of the first arcuate surface, the first planar surface, and at least part of the second arcuate surface.
- the center ram has a center ram surface which includes a center ram first arcuate surface, a center ram planar surface, and a center ram second arcuate surface where the center ram planar surface is interposed between the center ram first arcuate surface and the center ram second arcuate surface.
- the center ram surface is complimentary in shape to the die center surface.
- the invention comprises, in another form thereof, a forming tool for forming a workpiece.
- the forming tool includes a die which has a die surface with a die center surface, a die first outer surface and a die second outer surface.
- the die center surface is in between the die first outer surface and the die second outer surface.
- the forming tool further includes a center ram, a first outside ram and a second outside ram.
- the center ram has a center ram surface complimentary in shape to the die center surface.
- the first outside ram includes a first outside ram surface complimentary in shape to the die first outer surface.
- the second outside ram includes a second outside ram surface complimentary in shape to the die second outer surface.
- the invention comprises, in another form thereof, press for forming a workpiece.
- the press includes at least one guidepost and a forming tool actuatable along the at least one guidepost.
- the forming tool includes a die which has a die surface with a die center surface, a die first outer surface and a die second outer surface. The die center surface is in between the die first outer surface and the die second outer surface.
- the forming tool further includes a center ram, a first outside ram and a second outside ram.
- the center ram has a center ram surface complimentary in shape to the die center surface.
- the first outside ram includes a first outside ram surface complimentary in shape to the die first outer surface.
- the second outside ram includes a second outside ram surface complimentary in shape to the die second outer surface.
- An advantage of the present invention is that the formed workpiece is formed at a single workstation, which forming operation previously required multiple workstations, and/or multiple die forming stations in a single workstation.
- Another advantage of the present invention is that, by eliminating the need for multiple workstations, and/or multiple die forming stations in a single workstation, which each include a press and forming tool, the capital expense is reduced.
- Yet another advantage of the present invention is that the manufacturing cycle time for the formed workpiece is reduced.
- Yet another advantage of the present invention is that the manufacturing cost of the formed workpiece is reduced.
- Yet another advantage of the present invention is that, by eliminating the need for multiple workstations, and/or multiple die forming stations in a single workstation, which each can include a press and forming tool, extra handling of the formed workpiece and transportation of the formed workpiece between workstations is eliminated.
- Yet another advantage of the present invention is that, by minimizing the handling of the formed workpiece and transportation of the formed workpiece, the quality of the formed workpiece increases and the quality of the formed workpiece is also more easily controllable.
- Yet another advantage of the present invention is that, by eliminating the need for multiple workstations, and/or multiple die forming stations in a single workstation, which each can include manufacturing tolerances and errors associated therewith, the quality of the formed workpiece increases and the quality of the formed workpiece is also more easily controllable.
- Yet another advantage of the present invention is that, by eliminating the need for multiple workstations, fewer operators are needed to form the workpiece and/or the operator(s) can spend more time monitoring tooling trends and product quality in order to prevent product defects, for example.
- Yet another advantage of the present invention is that press operator training costs are reduced.
- Yet another advantage of the present invention is that energy costs associated with forming the workpiece are reduced.
- Yet another advantage of the present invention is that overhead expenses associated with forming the workpiece are reduced.
- Yet another advantage of the present invention is that work in process inventory associated with forming the workpiece is reduced.
- Yet another advantage of the present invention is that required manufacturing maintenance costs associated with forming the workpiece are reduced.
- Yet another advantage of the present invention is that maintenance, repair and operations (MRO) inventory costs associated with forming the workpiece are reduced.
- MRO maintenance, repair and operations
- Yet another advantage is that the forming tool of the present invention is relatively simple and inexpensive to manufacture and maintain.
- Yet another advantage of the present invention is that, by reducing the manufacturing cycle time associated with forming the workpiece, finished goods inventory can be reduced since the manufacturing system is now more responsive to customer demand.
- FIG. 1 is a perspective view of an embodiment of a press and forming tool according to the present invention
- FIG. 2 is a perspective view of an embodiment of a formed workpiece formed using the press and forming tool of FIG. 1 ;
- FIG. 3 is a front, partially fragmentary view of the press and forming tool of FIG. 1 with the workpiece sheetmetal blank inserted between the rams and die of the forming tool;
- FIG. 4 is a front, partially fragmentary view of the press and forming tool of FIG. 1 with the workpiece inserted between the rams and die of the forming tool, and with the center ram engaging the workpiece;
- FIG. 5 is a front, partially fragmentary view of the press and forming tool of FIG. 1 with the workpiece inserted between the rams and die of the forming tool, and with the center ram and the outside rams engaging the workpiece.
- Press 10 for forming a workpiece 12 .
- Press 10 generally includes at least one guidepost 14 and a forming tool 16 actuatable along the at least one guidepost 14 .
- Workpiece 12 is shown in its formed or finished state in FIG. 2 .
- Workpiece 12 can be of any bendable material, and particularly can be of a metal material such as steel or aluminum, but the material of workpiece 12 is not limited to metals.
- workpiece 12 is in the form of a reflector or reflector housing such as is used in a light fixture, particularly a fluorescent light fixture, but is not limited to such a form.
- forming tool 16 includes a die 18 with a die surface 20 which has a die center surface 22 , a die first outer surface 24 and a die second outer surface 26 .
- Die center surface 22 is in between die first outer surface 24 and die second outer surface 26 .
- a center ram 28 includes a center ram surface 30 complimentary in shape to die center surface 22 .
- a first outside ram 32 has a first outside ram surface 34 complimentary in shape to die first outer surface 24 .
- a second outside ram 36 has a second outside ram surface 38 complimentary in shape to die second outer surface 26 .
- die surface 20 further includes a first arcuate surface 40 , a first planar surface 42 and a second arcuate surface 44 .
- First planar surface 42 is interposed between first arcuate surface 40 and second arcuate surface 44 .
- Die center surface 22 includes at least part of first arcuate surface 40 , first planar surface 42 , and at least part of second arcuate surface 44 .
- Die surface 20 further includes a first edge planar surface 46 connected to first arcuate surface 40 , and a second edge planar surface 48 connected to second arcuate surface 44 .
- Die surface 20 can also have a third edge planar surface 50 which extends from first edge planar surface 46 at an angle of approximately 90°, for example, but other angles are possible.
- Fourth edge planar surface 52 extends from second edge planar surface 48 , also at an angle.
- Center ram surface 30 includes a center ram first arcuate surface 54 , a center ram planar surface 56 , and a center ram second arcuate surface 58 .
- Center ram planar surface 56 is interposed between center ram first arcuate surface 54 and center ram second arcuate surface 58 .
- First outside ram surface 34 includes a first outside ram arcuate surface 60 connected to a first outside ram edge surface 62 .
- second outside ram surface 38 includes a second outside ram arcuate surface 64 connected to a second outside ram edge surface 66 .
- All of the arcuate surfaces of forming tool 16 can have profiles which are circular, parabolic, elliptical, some combination thereof, and/or other complex curvatures.
- Guideposts 14 are as known in the forming processes' art as related to press apparatus.
- FIGS. 3-5 the method of the present invention is generally shown sequentially in FIGS. 3-5 where FIG. 3 shows the blank of workpiece 12 , which can be a sheet metal such as steel, or other bendable materials.
- the blank of workpiece 12 is placed between die 18 and rams 28 , 32 and 36 .
- center ram 28 is pressed against workpiece 12 and toward die 18 to a first predetermined die depth 68 , which is approximately die center surface 22 plus the thickness of the material of workpiece 12 .
- FIG. 3 shows the blank of workpiece 12 , which can be a sheet metal such as steel, or other bendable materials.
- the blank of workpiece 12 is placed between die 18 and rams 28 , 32 and 36 .
- center ram 28 is pressed against workpiece 12 and toward die 18 to a first predetermined die depth 68 , which is approximately die center surface 22 plus the thickness of the material of workpiece 12 .
- the present invention discloses a method of forming a workpiece, including the steps of: providing center ram 28 , first outside ram 32 , second outside ram 36 , and die 18 , and particularly with center ram surface 30 being complimentary in shape to die center surface 22 ; pressing center ram 28 against workpiece 12 and toward die 18 to first predetermined die depth 68 ; trapping workpiece 12 between center ram 28 and die 18 ; pressing first outside ram 32 and second outside ram 36 against workpiece 12 and toward die 18 to second predetermined die depth 70 ; and stretching workpiece 12 beyond a yield tensile strength of the workpiece 12 material using die 18 , center ram 28 , first outside ram 32 and second outside ram 36 .
- the method of the present invention can further include the steps of forming workpiece 12 in a shape complimentary to surface 20 of die 18 ; and eliminating a spring-back in workpiece 12 .
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
Description
- This is a non-provisional application based upon U.S. provisional patent application Ser. No. 60/564,010, entitled “MULTI-RAM PRESS AND METHOD OF METAL FORMING”, filed Apr. 20, 2004.
- 1. Field of the Invention
- The present invention relates to metal forming, and, more particularly, to the forming of a reflector or reflector housing of a light fixture.
- 2. Description of the Related Art
- Robert Hooke articulated in his 1678 treatise ut tensio sic vis a relationship between elastic deformation and load which is now known as Hooke's law, and which states, in its simplest form, that stress is proportional to strain where stress is the force per unit area in a body and strain is the axial deformation per unit length of the same body. The constant of proportionality is known as the modulus of elasticity, or Young's modulus, where strain=stress/Young's modulus. For common metal materials such as many steels, Hooke's law describes the elastic region of the stress-strain curve associated with a particular steel where a steel body at normal temperature regains its original shape, or springs-back, upon the removal of the stress causing load.
- Hooke's law holds up to a point where the material becomes plastic (the point where the deformation (strain) of the material is unrecovered) and this point is called yield tensile strength. The plastic region terminates at the ultimate tensile strength of a material which is the limit stress at which the material actually breaks. In many steel constructions, the maximum allowable tensile stress at any point in the construction is ⅔ of the yield strength of the particular steel in order to provide a margin of safety relative to potential fracture of the material.
- In metal forming, there is known an apparatus for a method of bending a channel section workpiece whereby a center projection is moved with a counter pressure plate, with the workpiece in between, against side formations which constrain the piece. A desired double bending or joggle is created with no crinkling or rippling of the member flanges and the extent of displacement of the center section can be selectively adjusted to allow for “spring-back” so that the final shape, when released from the press, is within required tolerances even though the specification of the metal, in particular its yield strength, may vary. However, disadvantages of this apparatus include that it requires seven rams, and a center projection is moved with a counter pressure plate.
- Also known is an apparatus for securing a piece of flat sheet metal between two sets of outer vice plates, and center pressure and counterpressure plates whereby the center plates move vertically and the outer plates move horizontally to avoid stretching the piece. A disadvantage of this apparatus is that it is complicated by requiring center plates which move vertically and outer plates which move horizontally.
- In another known apparatus there is disclosed a molding die of irregular-shape between a male die and a female die whereby a pin in a male die extend to hold the sheet piece against the female die while side parts shape the piece. Just before the end of the molding, the pins go into the male die and mold the sharply bent parts, and as a result, the sharply bent parts are molded. A disadvantage of this apparatus is that it requires a pin in the male die.
- Another known metal forming system includes multiple die forming stations in order to achieve a required final shape of the formed part. Disadvantages of this kind of system include a high capital cost for the multiple die forming stations, increased manufacturing cycle time required by the transferring of the formed part to the multiple stations, and a potential for quality problems in the formed part due to the additional handling and multiple die forming stations.
- What is needed in the art is a metal forming apparatus and method which forms a metal part with a minimum of die forming stations, rams and operations, and relatively simple and inexpensive dies and rams.
- The present invention provides a single station method of forming a reflector or reflector housing of a light fixture, or other formed parts, which effectively eliminates spring-back in the formed part.
- The invention comprises, in one form thereof, a method of forming a workpiece, including the steps of: providing a center ram, a first outside ram, a second outside ram, and a die; pressing the center ram against the workpiece and toward the die to a first predetermined die depth; trapping the workpiece between the center ram and the die; pressing the first outside ram and the second outside ram against the workpiece and toward the die to a second predetermined die depth; and stretching the workpiece beyond a yield tensile strength of the workpiece material. The die includes a die surface which has a first arcuate surface, a first planar surface and a second arcuate surface, where the first planar surface is interposed between the first arcuate surface and the second arcuate surface. The die surface has a die center surface which includes at least part of the first arcuate surface, the first planar surface, and at least part of the second arcuate surface. The center ram has a center ram surface which includes a center ram first arcuate surface, a center ram planar surface, and a center ram second arcuate surface where the center ram planar surface is interposed between the center ram first arcuate surface and the center ram second arcuate surface. The center ram surface is complimentary in shape to the die center surface.
- The invention comprises, in another form thereof, a forming tool for forming a workpiece. The forming tool includes a die which has a die surface with a die center surface, a die first outer surface and a die second outer surface. The die center surface is in between the die first outer surface and the die second outer surface. The forming tool further includes a center ram, a first outside ram and a second outside ram. The center ram has a center ram surface complimentary in shape to the die center surface. The first outside ram includes a first outside ram surface complimentary in shape to the die first outer surface. The second outside ram includes a second outside ram surface complimentary in shape to the die second outer surface.
- The invention comprises, in another form thereof, press for forming a workpiece. The press includes at least one guidepost and a forming tool actuatable along the at least one guidepost. The forming tool includes a die which has a die surface with a die center surface, a die first outer surface and a die second outer surface. The die center surface is in between the die first outer surface and the die second outer surface. The forming tool further includes a center ram, a first outside ram and a second outside ram. The center ram has a center ram surface complimentary in shape to the die center surface. The first outside ram includes a first outside ram surface complimentary in shape to the die first outer surface. The second outside ram includes a second outside ram surface complimentary in shape to the die second outer surface.
- An advantage of the present invention is that the formed workpiece is formed at a single workstation, which forming operation previously required multiple workstations, and/or multiple die forming stations in a single workstation.
- Another advantage of the present invention is that, by eliminating the need for multiple workstations, and/or multiple die forming stations in a single workstation, which each include a press and forming tool, the capital expense is reduced.
- Yet another advantage of the present invention is that the manufacturing cycle time for the formed workpiece is reduced.
- Yet another advantage of the present invention is that the manufacturing cost of the formed workpiece is reduced.
- Yet another advantage of the present invention is that, by eliminating the need for multiple workstations, and/or multiple die forming stations in a single workstation, which each can include a press and forming tool, extra handling of the formed workpiece and transportation of the formed workpiece between workstations is eliminated.
- Yet another advantage of the present invention is that, by minimizing the handling of the formed workpiece and transportation of the formed workpiece, the quality of the formed workpiece increases and the quality of the formed workpiece is also more easily controllable.
- Yet another advantage of the present invention is that, by eliminating the need for multiple workstations, and/or multiple die forming stations in a single workstation, which each can include manufacturing tolerances and errors associated therewith, the quality of the formed workpiece increases and the quality of the formed workpiece is also more easily controllable.
- Yet another advantage of the present invention is that, by eliminating the need for multiple workstations, fewer operators are needed to form the workpiece and/or the operator(s) can spend more time monitoring tooling trends and product quality in order to prevent product defects, for example.
- Yet another advantage of the present invention is that press operator training costs are reduced.
- Yet another advantage of the present invention is that energy costs associated with forming the workpiece are reduced.
- Yet another advantage of the present invention is that overhead expenses associated with forming the workpiece are reduced.
- Yet another advantage of the present invention is that work in process inventory associated with forming the workpiece is reduced.
- Yet another advantage of the present invention is that required manufacturing maintenance costs associated with forming the workpiece are reduced.
- Yet another advantage of the present invention is that maintenance, repair and operations (MRO) inventory costs associated with forming the workpiece are reduced.
- Yet another advantage is that the forming tool of the present invention is relatively simple and inexpensive to manufacture and maintain.
- Yet another advantage of the present invention is that, by reducing the manufacturing cycle time associated with forming the workpiece, finished goods inventory can be reduced since the manufacturing system is now more responsive to customer demand.
- The above-mentioned and other features and advantages of this invention, and the manner of attaining them, will become more apparent and the invention will be better understood by reference to the following description of embodiments of the invention taken in conjunction with the accompanying drawings, wherein:
-
FIG. 1 is a perspective view of an embodiment of a press and forming tool according to the present invention; -
FIG. 2 is a perspective view of an embodiment of a formed workpiece formed using the press and forming tool ofFIG. 1 ; -
FIG. 3 is a front, partially fragmentary view of the press and forming tool ofFIG. 1 with the workpiece sheetmetal blank inserted between the rams and die of the forming tool; -
FIG. 4 is a front, partially fragmentary view of the press and forming tool ofFIG. 1 with the workpiece inserted between the rams and die of the forming tool, and with the center ram engaging the workpiece; and -
FIG. 5 is a front, partially fragmentary view of the press and forming tool ofFIG. 1 with the workpiece inserted between the rams and die of the forming tool, and with the center ram and the outside rams engaging the workpiece. - Corresponding reference characters indicate corresponding parts throughout the several views. The exemplifications set out herein illustrate one preferred embodiment of the invention, in one form, and such exemplifications are not to be construed as limiting the scope of the invention in any manner.
- Referring now to the drawings, and more particularly to
FIGS. 1 and 2 , there is shown apress 10 for forming aworkpiece 12.Press 10 generally includes at least oneguidepost 14 and a formingtool 16 actuatable along the at least oneguidepost 14. -
Workpiece 12 is shown in its formed or finished state inFIG. 2 .Workpiece 12 can be of any bendable material, and particularly can be of a metal material such as steel or aluminum, but the material ofworkpiece 12 is not limited to metals. In the embodiment shown inFIG. 2 ,workpiece 12 is in the form of a reflector or reflector housing such as is used in a light fixture, particularly a fluorescent light fixture, but is not limited to such a form. - Shown particularly in
FIGS. 3-5 , formingtool 16 includes a die 18 with adie surface 20 which has adie center surface 22, a die first outer surface 24 and a die secondouter surface 26.Die center surface 22 is in between die first outer surface 24 and die secondouter surface 26. Acenter ram 28 includes acenter ram surface 30 complimentary in shape to diecenter surface 22. A firstoutside ram 32 has a firstoutside ram surface 34 complimentary in shape to die first outer surface 24. A secondoutside ram 36 has a secondoutside ram surface 38 complimentary in shape to die secondouter surface 26. - In one embodiment, die
surface 20 further includes a firstarcuate surface 40, a first planar surface 42 and a secondarcuate surface 44. First planar surface 42 is interposed between firstarcuate surface 40 and secondarcuate surface 44.Die center surface 22 includes at least part of firstarcuate surface 40, first planar surface 42, and at least part of secondarcuate surface 44. Diesurface 20 further includes a first edgeplanar surface 46 connected to firstarcuate surface 40, and a second edgeplanar surface 48 connected to secondarcuate surface 44. Diesurface 20 can also have a third edgeplanar surface 50 which extends from first edgeplanar surface 46 at an angle of approximately 90°, for example, but other angles are possible. Fourth edgeplanar surface 52 extends from second edgeplanar surface 48, also at an angle. -
Center ram surface 30 includes a center ram firstarcuate surface 54, a center ram planar surface 56, and a center ram second arcuate surface 58. Center ram planar surface 56 is interposed between center ram firstarcuate surface 54 and center ram second arcuate surface 58. Firstoutside ram surface 34 includes a first outside ram arcuate surface 60 connected to a first outsideram edge surface 62. Similarly, secondoutside ram surface 38 includes a second outside ramarcuate surface 64 connected to a second outsideram edge surface 66. - All of the arcuate surfaces of forming
tool 16 can have profiles which are circular, parabolic, elliptical, some combination thereof, and/or other complex curvatures. -
Guideposts 14 are as known in the forming processes' art as related to press apparatus. - In use, the method of the present invention is generally shown sequentially in
FIGS. 3-5 whereFIG. 3 shows the blank ofworkpiece 12, which can be a sheet metal such as steel, or other bendable materials. The blank ofworkpiece 12 is placed betweendie 18 and rams 28, 32 and 36. InFIG. 4 ,center ram 28 is pressed againstworkpiece 12 and toward die 18 to a firstpredetermined die depth 68, which is approximately diecenter surface 22 plus the thickness of the material ofworkpiece 12. InFIG. 5 , while center ram 28 traps workpiece 12 againstdie 18, outside rams 32, 36 are pressed againstworkpiece 12 and toward die 18 to a secondpredetermined die depth 70, which is approximately die first outer surface 24 or die secondouter surface 26, plus the thickness of the material ofworkpiece 12. - More particularly, the present invention discloses a method of forming a workpiece, including the steps of: providing
center ram 28, firstoutside ram 32, secondoutside ram 36, and die 18, and particularly withcenter ram surface 30 being complimentary in shape to diecenter surface 22; pressingcenter ram 28 againstworkpiece 12 and toward die 18 to firstpredetermined die depth 68; trappingworkpiece 12 betweencenter ram 28 and die 18; pressing firstoutside ram 32 and secondoutside ram 36 againstworkpiece 12 and toward die 18 to secondpredetermined die depth 70; and stretchingworkpiece 12 beyond a yield tensile strength of theworkpiece 12material using die 18,center ram 28, firstoutside ram 32 and secondoutside ram 36. - The method of the present invention can further include the steps of forming
workpiece 12 in a shape complimentary to surface 20 ofdie 18; and eliminating a spring-back inworkpiece 12. - While the yield tensile strength of the material of
workpiece 12 is exceeded, the ultimate tensile strength of the material ofworkpiece 12 is not exceeded, thereby avoiding both spring-back inworkpiece 12 after forming, and fracture of the material ofworkpiece 12 thereby achieving the form ofworkpiece 12 as shown inFIG. 2 , for example, in asingle press 10 workstation with a single die forming station. - While this invention has been described as having a preferred design, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims.
Claims (17)
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US11/109,005 US20050229669A1 (en) | 2004-04-20 | 2005-04-19 | Multi-ram press and method of metal forming |
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US56401004P | 2004-04-20 | 2004-04-20 | |
US11/109,005 US20050229669A1 (en) | 2004-04-20 | 2005-04-19 | Multi-ram press and method of metal forming |
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Cited By (6)
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JP2012232329A (en) * | 2011-05-02 | 2012-11-29 | Honda Motor Co Ltd | Press molding method and device |
WO2014087908A1 (en) * | 2012-12-03 | 2014-06-12 | シロキ工業株式会社 | Channel material press-molding method and channel material press-molding device |
CN104668327A (en) * | 2015-03-19 | 2015-06-03 | 柳州市永益机械制造有限公司 | Arc-shaped plate stamping method |
CN104801583A (en) * | 2015-05-04 | 2015-07-29 | 上海顿格电子贸易有限公司 | Aluminum substrate bending equipment and working principle thereof |
US20160243604A1 (en) * | 2013-10-30 | 2016-08-25 | Jfe Steel Corporation | Method of sheet forming |
CN109926501A (en) * | 2019-01-07 | 2019-06-25 | 安徽力源数控刃模具制造有限公司 | A kind of alloy aluminium sheet pressure arc mold and method |
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US1623916A (en) * | 1925-05-01 | 1927-04-05 | Glascock Brothers Mfg Company | Corrugating machine |
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US4736610A (en) * | 1984-08-03 | 1988-04-12 | North American Agricultural, Inc. | Method and apparatus for making grain bin flooring |
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US4969346A (en) * | 1986-03-12 | 1990-11-13 | Usg Interiors, Inc. | Apparatus for producing cold roll-formed structures |
US4996864A (en) * | 1988-12-29 | 1991-03-05 | Enami Seiki Mfg. Co., Ltd. | Drawing machine |
US5819578A (en) * | 1995-03-23 | 1998-10-13 | Sapim Amada S.P.A. | Process and appartus for producing reinforcement profiles on sheet metal panels |
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Cited By (7)
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JP2012232329A (en) * | 2011-05-02 | 2012-11-29 | Honda Motor Co Ltd | Press molding method and device |
WO2014087908A1 (en) * | 2012-12-03 | 2014-06-12 | シロキ工業株式会社 | Channel material press-molding method and channel material press-molding device |
US20160243604A1 (en) * | 2013-10-30 | 2016-08-25 | Jfe Steel Corporation | Method of sheet forming |
US9914163B2 (en) * | 2013-10-30 | 2018-03-13 | Jfe Steel Corporation | Method of sheet forming |
CN104668327A (en) * | 2015-03-19 | 2015-06-03 | 柳州市永益机械制造有限公司 | Arc-shaped plate stamping method |
CN104801583A (en) * | 2015-05-04 | 2015-07-29 | 上海顿格电子贸易有限公司 | Aluminum substrate bending equipment and working principle thereof |
CN109926501A (en) * | 2019-01-07 | 2019-06-25 | 安徽力源数控刃模具制造有限公司 | A kind of alloy aluminium sheet pressure arc mold and method |
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