CA2616550A1 - Apparatus and method for forming shaped parts - Google Patents
Apparatus and method for forming shaped parts Download PDFInfo
- Publication number
- CA2616550A1 CA2616550A1 CA002616550A CA2616550A CA2616550A1 CA 2616550 A1 CA2616550 A1 CA 2616550A1 CA 002616550 A CA002616550 A CA 002616550A CA 2616550 A CA2616550 A CA 2616550A CA 2616550 A1 CA2616550 A1 CA 2616550A1
- Authority
- CA
- Canada
- Prior art keywords
- tube
- pressure
- liquid
- dies
- bending
- 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
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000007789 sealing Methods 0.000 claims abstract description 18
- 239000012530 fluid Substances 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims description 41
- 239000000463 material Substances 0.000 claims description 23
- 238000005452 bending Methods 0.000 claims description 21
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000010935 stainless steel Substances 0.000 claims description 7
- 229910001220 stainless steel Inorganic materials 0.000 claims description 7
- 239000000314 lubricant Substances 0.000 claims description 6
- 239000003112 inhibitor Substances 0.000 claims description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 238000003825 pressing Methods 0.000 abstract description 3
- 150000002739 metals Chemical class 0.000 description 6
- 239000000654 additive Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 229930192878 garvin Natural products 0.000 description 3
- 229910001263 D-2 tool steel Inorganic materials 0.000 description 2
- 229910000760 Hardened steel Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910001315 Tool steel Inorganic materials 0.000 description 2
- 230000009172 bursting Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910000788 1018 steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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
- B21D9/00—Bending tubes using mandrels or the like
- B21D9/15—Bending tubes using mandrels or the like using filling material of indefinite shape, e.g. sand, plastic material
-
- 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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
-
- 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
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/06—Bending rods, profiles, or tubes in press brakes or between rams and anvils or abutments; Pliers with forming dies
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
An apparatus and method are provided for forming a shaped part from a tube (14) having an end and at least one bend, the shaped part having an enlarger portion between the bend and the end. The shaped part is formed by applying pressure fluid within the tube (14) while maintaining pressure on the end of the tube to cause expansion of the tube between the bend and the end. The shaped part is formed on a hydraulic press (10) having upper (18) and lower dies (16). The apparatus (10) includes at least one side assembly (22) pivotally mounted to the lower die (16) with a cylinder (28) for applying pressure to at least one end of the tube (14). The apparatus further includes seals (34) for sealing ends of the tube (14) and a fluid control device (36) for pressurizing the fluid within the tube.
Description
T1TLE: APPARATUS AND METHOD FOR FORNIING SHAPED PARTS
BACKGROUND OF THE INVENTION
(00011 The present invention relates generally to the 6eld of forming tubular members into shaped parts using hydraulic pressure and, more particularly, to a method and apparatus for forming from a tube a shaped part having at least one bend and a substantially larger cross section in at least a portion of the tube between the bend or bends and an end or ends of the tube, [0002] Prior art discloses shaping, for example, metal tubes using hydraulic presses, For instance, U.S. Patent No. 2,892,254 to Garvin ("the Garvin Patent") discloses a hydraulic press for shaping metal parts. Hydraulic presses such as that disclosed by the Garvin Patent generall), have two opposing dies that close to form a cavity. The cavity defines the desired resultant shape of the part. To form a shaped part, a tube is placed in the cavity between the ,lies of a hydraulic press. The dies close and the ends of the tube are sealed. The tube is filled with liquid which is then pressurized to expand the tube until it conforms to the shape of the cavity defined by the dies of the hydraulic press. In this manner, the tube is expanded to form the desired shaped part. It has been found that the expansion of a tube is limited because as the tube is expanded the wall thickness of the expanded portion is progressively thimied. In practice, it has been found that the cross section of a tube cannot be expanded by more than about twenty percent.
BACKGROUND OF THE INVENTION
(00011 The present invention relates generally to the 6eld of forming tubular members into shaped parts using hydraulic pressure and, more particularly, to a method and apparatus for forming from a tube a shaped part having at least one bend and a substantially larger cross section in at least a portion of the tube between the bend or bends and an end or ends of the tube, [0002] Prior art discloses shaping, for example, metal tubes using hydraulic presses, For instance, U.S. Patent No. 2,892,254 to Garvin ("the Garvin Patent") discloses a hydraulic press for shaping metal parts. Hydraulic presses such as that disclosed by the Garvin Patent generall), have two opposing dies that close to form a cavity. The cavity defines the desired resultant shape of the part. To form a shaped part, a tube is placed in the cavity between the ,lies of a hydraulic press. The dies close and the ends of the tube are sealed. The tube is filled with liquid which is then pressurized to expand the tube until it conforms to the shape of the cavity defined by the dies of the hydraulic press. In this manner, the tube is expanded to form the desired shaped part. It has been found that the expansion of a tube is limited because as the tube is expanded the wall thickness of the expanded portion is progressively thimied. In practice, it has been found that the cross section of a tube cannot be expanded by more than about twenty percent.
[0003] The problem of limited expansion has been overcome by feeding additional tube material from both ends into the expanding portion during the expansion process. For ,xample, U.S. Patent No. 5,481,892 to Roper et al. ("the Roper Patent") discloses feeding additional tube material into expansion portions from both ends of a tube. The system and SUBSTITUTE SHEET (RULE 26) method of the Roper Patent discloses that the cross section of the tube can be expanded by as much as one-hundred percent. Although, according to the systeni and method of the Roper Patent, frictional constraints typically limit expansion of the cross section to fifty percent.
100041 One disadvantage of the system and method disclosed by the Roper Patent is that it is not possible to feed additional tube material into the expanding portion past a bend or bends in the tube when the ends of the tube are in an upright position.
[0005] Some prior art systems and methods have overcome this problem by separating the bending and expanding steps. For instance, U.S. Patent No. 5,353,618 to Roper et al.
discloses pre-bending, for example, metal tubes prior to the expansion step.
It has been found that it is possible to feed additional tube material into the expanding portion past a bend or bends in the tube when the tube is rotated such that the ends are in the same horizontal plane as the niain portion of the tube.
[0006] One disadvantage of pre-bending the tube prior to expansion is that it requires an additional step in the manufacturing process, which requires additional tooling and labor and therefore increases the price per part. For example, the tube first must be placed in a bender to create the bend or bends. The tube then must be transferred to the hydrofoi-ining apparatus for the expansion step, which increases labor time and may even require additional laborers.
Because the tube must be placed in the hydroforming apparatus such that the ends of the tube are in the same horizontal plane as the main portion of the tube, larger dies are required to accommodate the tube, which increases the cost of production. Additionally, pre-bending the tube prior to expansion causes thinning in the wall at the bend of the tube.
[0007] Another disadvantage of pre-bending the tube prior to expansion is that thin-walled tubes often split during the expansion step. It has been found that pre-bending is only possible with tubes having wall thicknesses of about 0.065 inches and greater.
[0008] Accordingly, there is a need for a method and apparatus that allows for the greater expansion of a shaped part having a bend between the expanding portion and the end of the tube or having bends on either side of the expanding portion between the expanding portion and the ends of the tube.
SUMMARY OF THE INVENTION
[0009] In accordance with one aspect of the present invention, a method is provided for forming fi=om a tube a shaped part having a bend and a substantially larger cross section than the original tube in at least a portion of the tube between the bend and an end. The method includes the steps of placing the tube into a hydraulic press having upper and lower dies, sealing the ends of the tube, filling the tube with a liquid, pressurizing the liquid to expand a portion of the tube, bending the tube between the expanding portion and one end, and axially pushing on the end of the tube adjacent the bend to feed metal into the expanding portion while the tube is being bent. As a result, the cross section of the expanded poi-tion can be expanded much more while still maintaining the desired wall thickness.
[00101 In accordance with another aspect of the present invention, an apparatus is provided for fonning fi-om a tube a shaped part having a bend and a substantially larger cross section in at least a portion of the tube between the bend and an end. The apparatus includes a hydraulic press having upper and lower dies, at least one sealing mechanism configured to seal the ends of the tube, a fluid control device for pressurizing liquid within the tube, and an assembly configured to ride on and follow the end of the tube as the tube is being bent while coaxially pressing on the end of the tube to feed material from the portion between the bend and the end into the portion that is being expanded. As a result, the cross section of the expanded portion can be enlarged by as much as sixty-five percent of the original cross section while maintaining the adequate thickiiess.
100041 One disadvantage of the system and method disclosed by the Roper Patent is that it is not possible to feed additional tube material into the expanding portion past a bend or bends in the tube when the ends of the tube are in an upright position.
[0005] Some prior art systems and methods have overcome this problem by separating the bending and expanding steps. For instance, U.S. Patent No. 5,353,618 to Roper et al.
discloses pre-bending, for example, metal tubes prior to the expansion step.
It has been found that it is possible to feed additional tube material into the expanding portion past a bend or bends in the tube when the tube is rotated such that the ends are in the same horizontal plane as the niain portion of the tube.
[0006] One disadvantage of pre-bending the tube prior to expansion is that it requires an additional step in the manufacturing process, which requires additional tooling and labor and therefore increases the price per part. For example, the tube first must be placed in a bender to create the bend or bends. The tube then must be transferred to the hydrofoi-ining apparatus for the expansion step, which increases labor time and may even require additional laborers.
Because the tube must be placed in the hydroforming apparatus such that the ends of the tube are in the same horizontal plane as the main portion of the tube, larger dies are required to accommodate the tube, which increases the cost of production. Additionally, pre-bending the tube prior to expansion causes thinning in the wall at the bend of the tube.
[0007] Another disadvantage of pre-bending the tube prior to expansion is that thin-walled tubes often split during the expansion step. It has been found that pre-bending is only possible with tubes having wall thicknesses of about 0.065 inches and greater.
[0008] Accordingly, there is a need for a method and apparatus that allows for the greater expansion of a shaped part having a bend between the expanding portion and the end of the tube or having bends on either side of the expanding portion between the expanding portion and the ends of the tube.
SUMMARY OF THE INVENTION
[0009] In accordance with one aspect of the present invention, a method is provided for forming fi=om a tube a shaped part having a bend and a substantially larger cross section than the original tube in at least a portion of the tube between the bend and an end. The method includes the steps of placing the tube into a hydraulic press having upper and lower dies, sealing the ends of the tube, filling the tube with a liquid, pressurizing the liquid to expand a portion of the tube, bending the tube between the expanding portion and one end, and axially pushing on the end of the tube adjacent the bend to feed metal into the expanding portion while the tube is being bent. As a result, the cross section of the expanded poi-tion can be expanded much more while still maintaining the desired wall thickness.
[00101 In accordance with another aspect of the present invention, an apparatus is provided for fonning fi-om a tube a shaped part having a bend and a substantially larger cross section in at least a portion of the tube between the bend and an end. The apparatus includes a hydraulic press having upper and lower dies, at least one sealing mechanism configured to seal the ends of the tube, a fluid control device for pressurizing liquid within the tube, and an assembly configured to ride on and follow the end of the tube as the tube is being bent while coaxially pressing on the end of the tube to feed material from the portion between the bend and the end into the portion that is being expanded. As a result, the cross section of the expanded portion can be enlarged by as much as sixty-five percent of the original cross section while maintaining the adequate thickiiess.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] While the specification concludes with claims particularly pointing out and distinctly claiming the present invention, it is believed the same will be better understood from the following description taken in conjunction with the accompanying drawings, wliich illustrate, in a non-linliting fashion, the best mode presently contemplated for canying out the present invention, and in which like reference numerals designate like parts throughout the Figures, wherein:
[0012] Fig 1 is a partial perspective view of a portion of the prefeiTed embodiment of the present invention, as shown in the open position;
[0013] Fig. 2 is a partial perspective view of a portion of the preferred embodiment of the present invention, as shown in the closed position;
[0014] Fig. 3 is a side elevational view of the preferred embodiment of the present invention, as shown in the open position;
[0015] Fig. 4 is a side elevational view of the preferred embodiment of the present invention, as shown in the closed position;
[0016] Fig. 5 is a cross sectional view of the prefeiTed embodiment of the present invention, as taken about Line A-A of Fig. 2.
DETAILED DESCRIPTION OF THE INVENTION
[0017] The present invention is directed towards an apparatus and method for forming fiom a tube a shaped part having a bend and a substantially larger cross section in at least a portion of the tube between the bend and an end.
[0018] The tube may be comprised of any material that perniits the formation of a bend and a substantially larger cross section in at least a portion of the tube between the bend and an end.
Preferably, the tube is comprised of metal. The present invention works especially well with common steel grades, such as SAE 1008 or 1018. The present invention also may be used with difficult-to-form metals such as Stainless Steel 304L or 409 or aluminum.
[0019] The wall thickness of the tube depends upon the diameter of the tube and the type of material used. For example, for a tube composed of SAE 1008 or 1018 steel and having a diameter of one inch, the present invention works best for wall thicknesses in the range of 0.028 to 0.031 inches. As another exan7ple, for a tube composed of Stainless Steel 304L and having a diameter of one inch, the present invention works best for wall thicknesses of 0.049 inches and greater.
[0020] The tube is expanded with any type of liquid that provides for the expansion of the tube upon pressurization. For example, the liquid may comprise water.
Alternatively, the liquid may comprise a mixttu=e or may include additives. For example, the liquid may include a lubricant and/or a rust iiihibitor. Preferably, the liquid is comprised of approximately 95%
water and 5% additives, including a lubricant and a nist inhibitor.
[0021] The present invention uses a hydraulic press for bending the tube and forming the shaped part. The hydraulic press has first and second dies that move between a first or open position and a second or closed position. In the first or open position, the dies are spaced apart, either vertically or horizontally, such that the tube may be placed in between the dies.
Preferably, the dies are configured such that the first die is above the second die. The first or upper die moves vertically downward from the first or open position to the second or closed position. Alternatively, both dies move towards each other from the first or open position to the second or closed position.
[0022] In the second or closed position, the dies engage one another, thereby enclosing on the tube. Preferably, the upper die moves vertically downward to engage the lower die, thereby enclosing on the tube. Alternatively, the dies are configured such that either the first die or the second die move. For example, the first die travels vertically upward towards the second die, or both dies move towards one another to enclose on the tube.
Additionally, the dies may be configured such that the dies travel in a horizontal path as opposed to a vertical path.
[0023] The dies have matching or corresponding cavities that hold the tube. In this an=angement, when the dies engage one another, the cavities define the desired shape of the tube following expansion.
[0024] An assembly retains at least one end of the tube during the bending and expansion steps. The assembly is configured to follow the end of the tube as the tube is being bent. The assembly also applies pressure to the end of the tube while the tube is being bent.
Additionally, the assembly maintains pressure on the end of the tube during the expansion step to cause expansion of the tube between the bend and the end. The assembly is pivotally mounted to one of the dies. Preferably, the assembly is mounted to the lower die.
[0025] The assembly pivots or moves from a first or downward position to a second or upward position. The assembly begins in the first or downward position. The tube is placed between the open dies such that an end of the tube is received by the assembly. Preferably, the tube is received by a bore in the assembly, which retains the end of the tube.
[0026] As the tube is bent, the assembly pivots towards the second or upward position in order to ride on and follow the end of the tube. Preferably, the assembly pivots about a pin, which is aligned with the bore. The assembly pivots about the pin to the second or upward position. In this maimer, the assembly retains the ends of tube as it is being bent.
[0027] The assembly includes a cylinder that pushes on the end of the tube while the tube is being bent. Preferably, the cylinder exerts force on a locking block, which retains the end of the tube, via a piston rod. As the assembly pivots upward, the cylinder continues to exert force on the end of the tube. By pushing on the tube, the cylinder forces the tube into the cavity between the dies. Additionally, the force exerted by the cylinder on the end of the tube causes expansion of the tube. Preferably, the cylinder is a hydraulic cylinder. Alteniatively, the cylinder can be electric or pneumatic.
[0028] The cylinder exerts a specific force on the tube depending upon the type of material comprising the tube.
[0029] The present invention includes a sealing mechanism to seal the ends of the tube. The sealing mechanism extends over or into the ends of the tube, thereby sealing the tube and allowing the tube to be pressurized by a fluid control device. Preferably, the sealing mechanism is a seal cone having tapered walls that is substantially similar to that disclosed in U.S. Patent No. 6,502,822 to Brown, which is incorporated by reference herein.
The sealing mechanism is preferably composed of a hardened steel such as D2 Steel, which is a hardened tool steel.
[0030] To form the shaped part, the tube is placed between the upper and lower dies of the hydraulic press. The ends of the tube are sealed by the sealing mechanism, and the tube is filled with the hydroforming liquid. The tube is bent, and the liquid inside the tube is pressurized by the fluid control device. The assembly presses on the ends of the tube during the bending process to feed tube material into the expanding portion between the bend and the end to maintain a desired thickness of the expanded portion during the bending and expanding steps.
[003,1.] While the tube is being bent, the liquid inside the tube is pressurized by the fluid control device. The pressurized liquid serves as a mandrel to prevent the tube from defoi-ining. The liquid is pressurized to a specific pressure or pressure range depending upon the type of mater-ial comprising the tube. For most metals, the liquid initially is pressurized to about 500 pounds per square inch and then is brouglit up to about 3,000 pounds per square inch during the course of the bending step.
[0032] While the tube is being expanded, the liquid inside the tube is pressurized by the fluid control device to be within the pressure range of 3,000 to 60,000 pounds per square inch. In order to cause expansion of the tube, the pressure of the liquid must be above the yield point of the tube. Additionally, the pressurized liquid must be below the lesser of either a pressure at which the dies separate or a bursting pressure of the tube. The bursting pressure, PU,,,=S1, is defined as:
[0033] PU,,,=St = (2 x th x TS) =(2 x f) [0034] where th is the wall thickness of the tube, r is the radius of the tube, and TS is the tensile strength of the material comprising the tube.
[0035] For most metals, the liquid initially is pressurized to be about 3,000 pounds per square inch. During expansion of the tube, the pressure of the liquid is increased to about 60,000 pounds per square inch to cause the tube material to completely fill the cavity between the dies.
[0036] During expansion of the tube, tube material is fed into the expanding portion of the tube, which allows for substantial expansion of the cross section of the tube.
Preferably, with a tube composed of Stainless Steel Type 304L, the tube material fed into the expanding portion of the -tube causes the cross section to expand by as much as sixty-five percent.
[0037] Many changes and modifications will occur to those skilled in the art upon studying this description. All such changes and modifications which are within the spirit of the invention are intended to be included within the scope of the claims.
DESCRIPTION OF THE PREFERRED EMBODIMENT
[0038] The present invention will now be described more fully with reference to the Figures in which the preferred embodiment of the present invention is shown. The subject matter of this disclosure may, however, be embodied in inany different forms and should not be construed as being limited to the embodiment set forth herein.
[0039] Referring now to the drawings, wherein like reference numerals designate identical or coiTesponding parts tliroughout the several views, Fig. 1 is a perspective view of the rotating hydrofoi-ming apparatus 10. The present invention is used in connection with a hydraulic press 12 for bending a tube 14 and foiniing the shaped part.
[0040] With reference to Figs. l and 3, the hydraulic press 12 has first and second dies 16, 18 that are shown in a first position. In the first or open position, the dies 16, 18 are spaced apart, either vertically or horizontally, such that the tube 14 may be placed in between the dies. For example, as shown in Fig. 3, dies 16, 18 are disposed in parallel spaced relation to one another such that second or upper die 18 is disposed above first or lower die 16. Upper die 18 moves vertically downward from the first or open position shown in Fig.
3 to a second or closed position shown in Figs. 2 and 4.
[0041] First die 16 includes a cavity 20 that holds the tube 14 and defines a portion of the desired shape of the tube following expansion, as described hereafter.
Similarly, second die 18 includes a cavity (not shown) that corresponds with cavity 20. In this aiTangement, when the dies 16, 18 engage one another, as shown in Fig. 4, the cavities define the desired shape of the tube 14 following expansion, as described hereafter.
[0042] An assembly 22 is pivotally mounted to one of the dies 16, 18.
Preferably, assembly 22 is mounted to the first or lower die 16. Alternatively, assembly 22 may be mounted to the second or upper die 18. Assembly 22 is configured to follow the end of the tube 14 as the tube is being bent. Additionally, assembly 22 pushes on the end of the tube 14, as described hereafter.
[0043] Assembly 22 is shown in a first or downward position in Figs. 1 and 3.
In this manner, the tube 14 may be placed between the dies 16, 18 such that an end of the tube is received by assembly 22. Preferably, the tube 14 is received by a bore 24, which retains the end of the tube.
[0044] A cylinder 28 pushes on the end of the tube 14 while the tube is being bent. As shown in Figs. 1 and 3, cylinder 28 exerts force on locking block 30 via a piston rod 32, which retains the end of the tube 14. As the assembly 22 pivots upward, as shown in Figs. 2 and 4, cylinder 28 continues to exert force on the end of the tube 14. By pushing on the tube 14, the cylinder 28 forces the tube into the cavity 20. Additionally, the force exerted by cylinder 28 on the end of the tube 14 controls the expansion of the tube, as described hereafter. Cylinder 28 may be hydraulic or pneumatic. Preferably, cylinder 28 is a hydraulic cylinder.
[0045] The cylinder 28 exerts a specific force on the tube 14 depending upon the type of material comprising the tube.
[0046] Referring now to Figs. 2 and 4, the dies 16, 18 of the hydraulic press 12 are shown in a second position. In the second or closed position, the dies 16, 18 engage one another, thereby enclosing on the tube 14. Preferably, as shown in Fig. 4, upper die 18 moves vertically downward to engage lower die 16, thereby enclosing on the tube 14.
Alternatively, dies 16, 18 are configured such that either first die 16 or second die 18 move. For example, first die 16 may travel vertically upward towards second die 18, or both dies 16, 18 may move towards one another to enclose on the tube 14. Additionally, dies 16, 18 may be configured such that the dies 16, 18 travel in a horizontal path as opposed to the vertical path shown in Fig. 4.
[0047] The dies 16, 18 bend the tube 14 as the dies move into the second or closed position.
As the tube 14 is bent, assembly 22 pivots in a manner necessaiy to follow the end of the tube. Preferably, assembly 22 pivots about a pin 26, which is aligned with bore 24, as shown in Fig. 1. Assembly 22 pivots about pin 26 to a second or upward position, as shown in Figs.
2 and 4. In this mamler, assembly 22 retains the ends of tube 14 as it is being bent.
[0048] Refeiring now to Fig. 5, a sealing mechanism 34 is configured to seal the ends of the tube. The sealing mechanism extends into the ends of the tube, thereby sealing the tube and allowing the tube to be pressurized by a fluid control device 36. Preferably, the sealing mechanism 34 is a seal cone having tapered walls that is substantially similar to that disclosed in U.S. Patent No. 6,502,822 to Brown, which is incoiporated by reference herein. The sealing mechanism 34 is preferably composed of a hardened steel such as D2 Steel, which is a hardened tool steel.
[0049] To form a shaped part, the tube 14 is placed between the dies 16, 18 of the hydraulic press 12. The ends of the tube 14 are sealed by the sealing mechanism 34, and the tube is filled with a liquid. The tube is bent, and the liquid inside the tube is pressurized by the fluid control device 36. The assembly 22 presses on the ends of the tube 14 during the bending process to feed tube material into the expanding portion between the bend and the end to maintain a desired thickness of the expanded portion during the bending and expanding steps.
[0050] The tube 14 may be comprised of any material having a yield point to permit the foi-mation of a bend and a substantially larger cross section in at least a portion of the tube between the bend and an end. Preferably, the tube is comprised of metal. The present invention works especially well with conunon steel grades, such as SAE 1008 or 1018. The present invention also may be used with difficult-to-foi-in metals such as Stainless Steel 304L
or 409.
[0051 ] While the tube 14 is being bent, the liquid iiiside the tube is pressurized by the fluid control device 26. The pressiu-ized liquid serves as a mandrel to prevent the tube 14 from deforming. The liquid is pressurized to a specific pressure or pressure range depending upon the type of material comprising the tube 14. For most metals, the liquid initially is pressurized to about 500 pounds per square inch and then is brought up to about 3,000 pounds per square inch during the course of the bending step.
[0052] While the tube 14 is being expanded, the liquid inside the tube is pressurized by the fluid control device 36 to be within a range above a yield point of the tube and below a pressure at which the dies 16, 18 separate. For most metals, the liquid initially is pressurized to be to be about 3,000 pounds per square inch. During expansion of the tube, the pressure of the liquid is increased to about 60,000 pounds per square inch to cause the tube material to completely fill the cavity between the dies 16, 1 S.
[0053] During expansion of the tube 14, tube material is fed into the expanding portion of the tube, which allows for substantial expansion of the cross section of the tube.
Preferably, with a tube composed of Stainless Steel Type 304L, the tube material fed into the expanding portion of the tube causes the cross section to expand by as much as sixty-five percent.
[0054] The tube 14 may be expanded with any type of liquid that provides for the expansion of the tube upon pressurization. For example, the liquid may comprise water.
Alternatively, the liquid may comprise a mixture or may include additives. For example, the liquid may include a lubricant or a rust inllibitor, as the specific applications may require. Preferably, the liquid is comprised of approximately 95% water and 5% additives, including a lubricant and a i-ust inhibitor.
[0055] Many changes and modifications will occur to those skilled in the art upon studying this description. All such changes and modifications which are within the spirit of the invention are intended to be included within the scope of the claims.
[0011] While the specification concludes with claims particularly pointing out and distinctly claiming the present invention, it is believed the same will be better understood from the following description taken in conjunction with the accompanying drawings, wliich illustrate, in a non-linliting fashion, the best mode presently contemplated for canying out the present invention, and in which like reference numerals designate like parts throughout the Figures, wherein:
[0012] Fig 1 is a partial perspective view of a portion of the prefeiTed embodiment of the present invention, as shown in the open position;
[0013] Fig. 2 is a partial perspective view of a portion of the preferred embodiment of the present invention, as shown in the closed position;
[0014] Fig. 3 is a side elevational view of the preferred embodiment of the present invention, as shown in the open position;
[0015] Fig. 4 is a side elevational view of the preferred embodiment of the present invention, as shown in the closed position;
[0016] Fig. 5 is a cross sectional view of the prefeiTed embodiment of the present invention, as taken about Line A-A of Fig. 2.
DETAILED DESCRIPTION OF THE INVENTION
[0017] The present invention is directed towards an apparatus and method for forming fiom a tube a shaped part having a bend and a substantially larger cross section in at least a portion of the tube between the bend and an end.
[0018] The tube may be comprised of any material that perniits the formation of a bend and a substantially larger cross section in at least a portion of the tube between the bend and an end.
Preferably, the tube is comprised of metal. The present invention works especially well with common steel grades, such as SAE 1008 or 1018. The present invention also may be used with difficult-to-form metals such as Stainless Steel 304L or 409 or aluminum.
[0019] The wall thickness of the tube depends upon the diameter of the tube and the type of material used. For example, for a tube composed of SAE 1008 or 1018 steel and having a diameter of one inch, the present invention works best for wall thicknesses in the range of 0.028 to 0.031 inches. As another exan7ple, for a tube composed of Stainless Steel 304L and having a diameter of one inch, the present invention works best for wall thicknesses of 0.049 inches and greater.
[0020] The tube is expanded with any type of liquid that provides for the expansion of the tube upon pressurization. For example, the liquid may comprise water.
Alternatively, the liquid may comprise a mixttu=e or may include additives. For example, the liquid may include a lubricant and/or a rust iiihibitor. Preferably, the liquid is comprised of approximately 95%
water and 5% additives, including a lubricant and a nist inhibitor.
[0021] The present invention uses a hydraulic press for bending the tube and forming the shaped part. The hydraulic press has first and second dies that move between a first or open position and a second or closed position. In the first or open position, the dies are spaced apart, either vertically or horizontally, such that the tube may be placed in between the dies.
Preferably, the dies are configured such that the first die is above the second die. The first or upper die moves vertically downward from the first or open position to the second or closed position. Alternatively, both dies move towards each other from the first or open position to the second or closed position.
[0022] In the second or closed position, the dies engage one another, thereby enclosing on the tube. Preferably, the upper die moves vertically downward to engage the lower die, thereby enclosing on the tube. Alternatively, the dies are configured such that either the first die or the second die move. For example, the first die travels vertically upward towards the second die, or both dies move towards one another to enclose on the tube.
Additionally, the dies may be configured such that the dies travel in a horizontal path as opposed to a vertical path.
[0023] The dies have matching or corresponding cavities that hold the tube. In this an=angement, when the dies engage one another, the cavities define the desired shape of the tube following expansion.
[0024] An assembly retains at least one end of the tube during the bending and expansion steps. The assembly is configured to follow the end of the tube as the tube is being bent. The assembly also applies pressure to the end of the tube while the tube is being bent.
Additionally, the assembly maintains pressure on the end of the tube during the expansion step to cause expansion of the tube between the bend and the end. The assembly is pivotally mounted to one of the dies. Preferably, the assembly is mounted to the lower die.
[0025] The assembly pivots or moves from a first or downward position to a second or upward position. The assembly begins in the first or downward position. The tube is placed between the open dies such that an end of the tube is received by the assembly. Preferably, the tube is received by a bore in the assembly, which retains the end of the tube.
[0026] As the tube is bent, the assembly pivots towards the second or upward position in order to ride on and follow the end of the tube. Preferably, the assembly pivots about a pin, which is aligned with the bore. The assembly pivots about the pin to the second or upward position. In this maimer, the assembly retains the ends of tube as it is being bent.
[0027] The assembly includes a cylinder that pushes on the end of the tube while the tube is being bent. Preferably, the cylinder exerts force on a locking block, which retains the end of the tube, via a piston rod. As the assembly pivots upward, the cylinder continues to exert force on the end of the tube. By pushing on the tube, the cylinder forces the tube into the cavity between the dies. Additionally, the force exerted by the cylinder on the end of the tube causes expansion of the tube. Preferably, the cylinder is a hydraulic cylinder. Alteniatively, the cylinder can be electric or pneumatic.
[0028] The cylinder exerts a specific force on the tube depending upon the type of material comprising the tube.
[0029] The present invention includes a sealing mechanism to seal the ends of the tube. The sealing mechanism extends over or into the ends of the tube, thereby sealing the tube and allowing the tube to be pressurized by a fluid control device. Preferably, the sealing mechanism is a seal cone having tapered walls that is substantially similar to that disclosed in U.S. Patent No. 6,502,822 to Brown, which is incorporated by reference herein.
The sealing mechanism is preferably composed of a hardened steel such as D2 Steel, which is a hardened tool steel.
[0030] To form the shaped part, the tube is placed between the upper and lower dies of the hydraulic press. The ends of the tube are sealed by the sealing mechanism, and the tube is filled with the hydroforming liquid. The tube is bent, and the liquid inside the tube is pressurized by the fluid control device. The assembly presses on the ends of the tube during the bending process to feed tube material into the expanding portion between the bend and the end to maintain a desired thickness of the expanded portion during the bending and expanding steps.
[003,1.] While the tube is being bent, the liquid inside the tube is pressurized by the fluid control device. The pressurized liquid serves as a mandrel to prevent the tube from defoi-ining. The liquid is pressurized to a specific pressure or pressure range depending upon the type of mater-ial comprising the tube. For most metals, the liquid initially is pressurized to about 500 pounds per square inch and then is brouglit up to about 3,000 pounds per square inch during the course of the bending step.
[0032] While the tube is being expanded, the liquid inside the tube is pressurized by the fluid control device to be within the pressure range of 3,000 to 60,000 pounds per square inch. In order to cause expansion of the tube, the pressure of the liquid must be above the yield point of the tube. Additionally, the pressurized liquid must be below the lesser of either a pressure at which the dies separate or a bursting pressure of the tube. The bursting pressure, PU,,,=S1, is defined as:
[0033] PU,,,=St = (2 x th x TS) =(2 x f) [0034] where th is the wall thickness of the tube, r is the radius of the tube, and TS is the tensile strength of the material comprising the tube.
[0035] For most metals, the liquid initially is pressurized to be about 3,000 pounds per square inch. During expansion of the tube, the pressure of the liquid is increased to about 60,000 pounds per square inch to cause the tube material to completely fill the cavity between the dies.
[0036] During expansion of the tube, tube material is fed into the expanding portion of the tube, which allows for substantial expansion of the cross section of the tube.
Preferably, with a tube composed of Stainless Steel Type 304L, the tube material fed into the expanding portion of the -tube causes the cross section to expand by as much as sixty-five percent.
[0037] Many changes and modifications will occur to those skilled in the art upon studying this description. All such changes and modifications which are within the spirit of the invention are intended to be included within the scope of the claims.
DESCRIPTION OF THE PREFERRED EMBODIMENT
[0038] The present invention will now be described more fully with reference to the Figures in which the preferred embodiment of the present invention is shown. The subject matter of this disclosure may, however, be embodied in inany different forms and should not be construed as being limited to the embodiment set forth herein.
[0039] Referring now to the drawings, wherein like reference numerals designate identical or coiTesponding parts tliroughout the several views, Fig. 1 is a perspective view of the rotating hydrofoi-ming apparatus 10. The present invention is used in connection with a hydraulic press 12 for bending a tube 14 and foiniing the shaped part.
[0040] With reference to Figs. l and 3, the hydraulic press 12 has first and second dies 16, 18 that are shown in a first position. In the first or open position, the dies 16, 18 are spaced apart, either vertically or horizontally, such that the tube 14 may be placed in between the dies. For example, as shown in Fig. 3, dies 16, 18 are disposed in parallel spaced relation to one another such that second or upper die 18 is disposed above first or lower die 16. Upper die 18 moves vertically downward from the first or open position shown in Fig.
3 to a second or closed position shown in Figs. 2 and 4.
[0041] First die 16 includes a cavity 20 that holds the tube 14 and defines a portion of the desired shape of the tube following expansion, as described hereafter.
Similarly, second die 18 includes a cavity (not shown) that corresponds with cavity 20. In this aiTangement, when the dies 16, 18 engage one another, as shown in Fig. 4, the cavities define the desired shape of the tube 14 following expansion, as described hereafter.
[0042] An assembly 22 is pivotally mounted to one of the dies 16, 18.
Preferably, assembly 22 is mounted to the first or lower die 16. Alternatively, assembly 22 may be mounted to the second or upper die 18. Assembly 22 is configured to follow the end of the tube 14 as the tube is being bent. Additionally, assembly 22 pushes on the end of the tube 14, as described hereafter.
[0043] Assembly 22 is shown in a first or downward position in Figs. 1 and 3.
In this manner, the tube 14 may be placed between the dies 16, 18 such that an end of the tube is received by assembly 22. Preferably, the tube 14 is received by a bore 24, which retains the end of the tube.
[0044] A cylinder 28 pushes on the end of the tube 14 while the tube is being bent. As shown in Figs. 1 and 3, cylinder 28 exerts force on locking block 30 via a piston rod 32, which retains the end of the tube 14. As the assembly 22 pivots upward, as shown in Figs. 2 and 4, cylinder 28 continues to exert force on the end of the tube 14. By pushing on the tube 14, the cylinder 28 forces the tube into the cavity 20. Additionally, the force exerted by cylinder 28 on the end of the tube 14 controls the expansion of the tube, as described hereafter. Cylinder 28 may be hydraulic or pneumatic. Preferably, cylinder 28 is a hydraulic cylinder.
[0045] The cylinder 28 exerts a specific force on the tube 14 depending upon the type of material comprising the tube.
[0046] Referring now to Figs. 2 and 4, the dies 16, 18 of the hydraulic press 12 are shown in a second position. In the second or closed position, the dies 16, 18 engage one another, thereby enclosing on the tube 14. Preferably, as shown in Fig. 4, upper die 18 moves vertically downward to engage lower die 16, thereby enclosing on the tube 14.
Alternatively, dies 16, 18 are configured such that either first die 16 or second die 18 move. For example, first die 16 may travel vertically upward towards second die 18, or both dies 16, 18 may move towards one another to enclose on the tube 14. Additionally, dies 16, 18 may be configured such that the dies 16, 18 travel in a horizontal path as opposed to the vertical path shown in Fig. 4.
[0047] The dies 16, 18 bend the tube 14 as the dies move into the second or closed position.
As the tube 14 is bent, assembly 22 pivots in a manner necessaiy to follow the end of the tube. Preferably, assembly 22 pivots about a pin 26, which is aligned with bore 24, as shown in Fig. 1. Assembly 22 pivots about pin 26 to a second or upward position, as shown in Figs.
2 and 4. In this mamler, assembly 22 retains the ends of tube 14 as it is being bent.
[0048] Refeiring now to Fig. 5, a sealing mechanism 34 is configured to seal the ends of the tube. The sealing mechanism extends into the ends of the tube, thereby sealing the tube and allowing the tube to be pressurized by a fluid control device 36. Preferably, the sealing mechanism 34 is a seal cone having tapered walls that is substantially similar to that disclosed in U.S. Patent No. 6,502,822 to Brown, which is incoiporated by reference herein. The sealing mechanism 34 is preferably composed of a hardened steel such as D2 Steel, which is a hardened tool steel.
[0049] To form a shaped part, the tube 14 is placed between the dies 16, 18 of the hydraulic press 12. The ends of the tube 14 are sealed by the sealing mechanism 34, and the tube is filled with a liquid. The tube is bent, and the liquid inside the tube is pressurized by the fluid control device 36. The assembly 22 presses on the ends of the tube 14 during the bending process to feed tube material into the expanding portion between the bend and the end to maintain a desired thickness of the expanded portion during the bending and expanding steps.
[0050] The tube 14 may be comprised of any material having a yield point to permit the foi-mation of a bend and a substantially larger cross section in at least a portion of the tube between the bend and an end. Preferably, the tube is comprised of metal. The present invention works especially well with conunon steel grades, such as SAE 1008 or 1018. The present invention also may be used with difficult-to-foi-in metals such as Stainless Steel 304L
or 409.
[0051 ] While the tube 14 is being bent, the liquid iiiside the tube is pressurized by the fluid control device 26. The pressiu-ized liquid serves as a mandrel to prevent the tube 14 from deforming. The liquid is pressurized to a specific pressure or pressure range depending upon the type of material comprising the tube 14. For most metals, the liquid initially is pressurized to about 500 pounds per square inch and then is brought up to about 3,000 pounds per square inch during the course of the bending step.
[0052] While the tube 14 is being expanded, the liquid inside the tube is pressurized by the fluid control device 36 to be within a range above a yield point of the tube and below a pressure at which the dies 16, 18 separate. For most metals, the liquid initially is pressurized to be to be about 3,000 pounds per square inch. During expansion of the tube, the pressure of the liquid is increased to about 60,000 pounds per square inch to cause the tube material to completely fill the cavity between the dies 16, 1 S.
[0053] During expansion of the tube 14, tube material is fed into the expanding portion of the tube, which allows for substantial expansion of the cross section of the tube.
Preferably, with a tube composed of Stainless Steel Type 304L, the tube material fed into the expanding portion of the tube causes the cross section to expand by as much as sixty-five percent.
[0054] The tube 14 may be expanded with any type of liquid that provides for the expansion of the tube upon pressurization. For example, the liquid may comprise water.
Alternatively, the liquid may comprise a mixture or may include additives. For example, the liquid may include a lubricant or a rust inllibitor, as the specific applications may require. Preferably, the liquid is comprised of approximately 95% water and 5% additives, including a lubricant and a i-ust inhibitor.
[0055] Many changes and modifications will occur to those skilled in the art upon studying this description. All such changes and modifications which are within the spirit of the invention are intended to be included within the scope of the claims.
Claims (23)
1. A method for forming a shaped part from a tube including the steps of placing the tube into a hydraulic press having upper and lower dies, sealing the ends of the tube, filling the tube with a liquid, bending the tube, and pressurizing the liquid to expand at least a portion of said tube, characterized in that:
applying force to an end of the tube during the step of bending to feed tube material into the expanding portion between the bend and the end to maintain a desired thickness of the expanded portion during the bending and expanding steps.
applying force to an end of the tube during the step of bending to feed tube material into the expanding portion between the bend and the end to maintain a desired thickness of the expanded portion during the bending and expanding steps.
2. The method of claim 1 wherein said tube comprises metal.
3. The method of claim 1 wherein said tube comprises stainless steel.
4. The method of claim 1 wherein said tube comprises aluminum.
5. The method of claim 1 wherein the pressure inside the tube during bending is in a range of 500 to 3,000 pounds per square inch.
6. The method of claim 2 wherein the pressure to expand the tube is in a pressure range above a yield point of said tube and below a pressure at which said upper die and said lower die separate.
7. The method of claim 2 wherein the pressure to expand said tube is a pressure range of 3,000 to 60,000 pounds per square inch.
8. The method of claim I wherein the cross section of the expanding portion of tube expands by as much as sixty-five percent.
9. The method of claim 1 wherein said liquid comprises water.
10. The method of claim 1 wherein said liquid comprises water, a lubricant, and a rust inhibitor.
11. An apparatus for forming a shaped part from a tube, the apparatus having a hydraulic press having upper and lower dies, at least one sealing mechanism configured to seal the ends of the tube, and a fluid control device for pressurizing liquid within the tube, characterized in that:
an assembly configured to follow the end of the tube as the tube is being bent, the assembly also configured to apply force to the end of the tube to feed tube material into the expanding portion between the bend and the end to maintain a desired thickness of the expanded portion.
an assembly configured to follow the end of the tube as the tube is being bent, the assembly also configured to apply force to the end of the tube to feed tube material into the expanding portion between the bend and the end to maintain a desired thickness of the expanded portion.
12. The apparatus of claim 11 wherein the assembly comprises a hydraulic cylinder.
13. The apparatus of claim 12 wherein the cylinder is pivotally mounted to the lower die.
14. The apparatus of claim 11 wherein said tube comprises a metal.
15. The apparatus of claim 11 wherein said tube comprises stainless steel.
16. The apparatus of claim 11 wherein said tube comprises aluminum.
17. The apparatus of claim 11 wherein the pressure inside the tube during bending is in a range of 500 to 3,000 pounds per square inch.
18. The apparatus of claim 14 wherein the pressure to expand the tube is in a pressure range above a yield point of said tube and below a pressure at which said upper die and said lower die separate.
19. The apparatus of claim 14 wherein the pressure to expand said tube is a pressure range of 3,000 to 60,000 pounds per square inch.
20. The apparatus of claim 11 wherein the cross section of the expanding portion of tube expands by as much as sixty-five percent.
21. The apparatus of claim 11 wherein said liquid comprises water.
22. The apparatus of claim 11 wherein said liquid comprises water, a lubricant, and a rust inhibitor.
23. The apparatus of claim 11 wherein the sealing mechanism comprises a seal cone adapted to extend into the ends of the tube to seal and to allow the tube to be pressurized.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US2005/026482 WO2007018499A1 (en) | 2005-07-26 | 2005-07-26 | Apparatus and method for forming shaped parts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2616550A1 true CA2616550A1 (en) | 2007-02-15 |
Family
ID=37727596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002616550A Abandoned CA2616550A1 (en) | 2005-07-26 | 2005-07-26 | Apparatus and method for forming shaped parts |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1907147A4 (en) |
| JP (1) | JP2009502511A (en) |
| CA (1) | CA2616550A1 (en) |
| MX (1) | MX2007016408A (en) |
| WO (1) | WO2007018499A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITTO20080107A1 (en) * | 2008-02-11 | 2009-08-12 | Officine Metallurgiche Piemontesi S P A | COLD BENDING PROCEDURE OF TUBES AND SIMILARS |
| IT1391971B1 (en) * | 2008-11-26 | 2012-02-02 | Pst Engineering S R L | DEVICE FOR BENDING TUBES |
| EP2746155B1 (en) | 2012-12-21 | 2015-07-08 | Bell Helicopter Textron Inc. | Helicopter skid landing gear |
| CN109304388B (en) * | 2017-07-28 | 2020-06-12 | 上海宝钢高新技术零部件有限公司 | Device and method for in-mold bending of hydraulic forming four-bend part |
| DE102019100582A1 (en) * | 2019-01-11 | 2020-07-16 | Bayerische Motoren Werke Aktiengesellschaft | Device for hydroforming and method |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5396786A (en) * | 1993-03-15 | 1995-03-14 | Mueller Industries, Inc. | Machine and method for manufacturing crossover fittings |
| DE4428564C2 (en) | 1994-08-12 | 1996-09-19 | Daimler Benz Ag | Device for producing angled hollow parts by hydroforming |
| ES2186913T3 (en) * | 1996-08-26 | 2003-05-16 | Cosma Int Inc | SET OF HYDROFORMED MATRICES AND METHOD TO CONFORM TUBES WITHOUT CLOSING. |
| US6502822B1 (en) * | 1997-05-15 | 2003-01-07 | Aquaform, Inc. | Apparatus and method for creating a seal on an inner wall of a tube for hydroforming |
| US6006567A (en) * | 1997-05-15 | 1999-12-28 | Aquaform Inc | Apparatus and method for hydroforming |
| JP4358367B2 (en) * | 1998-10-16 | 2009-11-04 | 本田技研工業株式会社 | Structure and manufacturing method of vehicle body frame |
| JP3719928B2 (en) * | 2000-11-24 | 2005-11-24 | 新日本製鐵株式会社 | Bulge processing method |
| JP2003126923A (en) * | 2001-10-24 | 2003-05-08 | Honda Motor Co Ltd | Method of forming tubular member |
| ATE319526T1 (en) * | 2001-11-21 | 2006-03-15 | Schulz Gmbh Wilhelm | METHOD AND DEVICE FOR FORMING PIPES |
| JP2004044747A (en) * | 2002-07-15 | 2004-02-12 | Denso Corp | Branching pipe and method for manufacture the same |
| JP2004114078A (en) * | 2002-09-25 | 2004-04-15 | Suzuki Motor Corp | Method for manufacturing hydroformed parts having projected shape |
| DE10306161B4 (en) * | 2003-02-14 | 2005-02-17 | Daimlerchrysler Ag | Device for hydroforming workpieces |
| JP4133465B2 (en) * | 2003-03-10 | 2008-08-13 | 新日本製鐵株式会社 | Hydroform processing method |
| JP3839787B2 (en) * | 2003-05-14 | 2006-11-01 | アイシン高丘株式会社 | Manufacturing method of double wall hollow metal parts |
| JP4259194B2 (en) * | 2003-06-11 | 2009-04-30 | 日産自動車株式会社 | Hydraulic molding method and hydraulic molding apparatus |
| JP2005081432A (en) * | 2003-09-11 | 2005-03-31 | Toyo Valve Co Ltd | Valve housing manufacturing method, and valve manufacturing method |
-
2005
- 2005-07-26 CA CA002616550A patent/CA2616550A1/en not_active Abandoned
- 2005-07-26 WO PCT/US2005/026482 patent/WO2007018499A1/en active Application Filing
- 2005-07-26 JP JP2008523850A patent/JP2009502511A/en active Pending
- 2005-07-26 MX MX2007016408A patent/MX2007016408A/en not_active Application Discontinuation
- 2005-07-26 EP EP05775704A patent/EP1907147A4/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| JP2009502511A (en) | 2009-01-29 |
| WO2007018499A1 (en) | 2007-02-15 |
| MX2007016408A (en) | 2008-03-10 |
| EP1907147A1 (en) | 2008-04-09 |
| EP1907147A4 (en) | 2009-04-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2104826C (en) | Apparatus and method for forming and hydropiercing a tubular frame member | |
| US5481892A (en) | Apparatus and method for forming a tubular member | |
| EP0199246B1 (en) | Method for plastically deforming elongated hollow members | |
| EP0693981B1 (en) | Apparatus and method for the stretch forming of elongated hollow metal sections | |
| US8091201B2 (en) | Stamped tubular member and method and apparatus for making same | |
| EA000657B1 (en) | Hydroforming die assembly and method for pinch-free tube forming | |
| NO173978B (en) | PROCEDURE AND APPARATUS FOR THE FORMATION OF CASH-LIKE FRAME COMPONENTS | |
| CA2616550A1 (en) | Apparatus and method for forming shaped parts | |
| WO1994022611A9 (en) | Apparatus and method for the stretch forming of elongated hollow metal sections | |
| EP1326722B1 (en) | Apparatus and method for hydroforming a tubular part | |
| US7096700B2 (en) | Method for performing a hydroforming operation | |
| EP1100637B1 (en) | Device and method for expansion forming | |
| EP0693980B1 (en) | Flexible constraining apparatus and method for the stretch forming of elongated hollow metal sections | |
| US7284403B2 (en) | Apparatus and method for performing a hydroforming process | |
| CN110369549B (en) | Integral rolling method for transition step pipe with smaller pipe diameter ratio and conical surface | |
| CA1134650A (en) | Up-set shrinker for producing thick wall steel pipe | |
| US3670545A (en) | Bulge-forming apparatus | |
| KR20080036589A (en) | Apparatus and method for forming shaped parts | |
| WO1994020234A1 (en) | Method of forming tubular members | |
| US9186714B1 (en) | Process for making a stamped tubular form with integral bracket and products made by the process | |
| AU752981B2 (en) | Apparatus and method for forming and hydropiercing a tubular frame member | |
| US20010011470A1 (en) | Process and device for producing pipes as per the UOE process | |
| RU2172221C2 (en) | Hydraulic press for shaping sharply bent branch pipes | |
| RU2110344C1 (en) | Ingot extrusion method | |
| JPS6049056B2 (en) | Bulge processing equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |
Effective date: 20150728 |