EP0700323A1 - Radial extrusion process combined with inside tube ironing - Google Patents
Radial extrusion process combined with inside tube ironingInfo
- Publication number
- EP0700323A1 EP0700323A1 EP94916475A EP94916475A EP0700323A1 EP 0700323 A1 EP0700323 A1 EP 0700323A1 EP 94916475 A EP94916475 A EP 94916475A EP 94916475 A EP94916475 A EP 94916475A EP 0700323 A1 EP0700323 A1 EP 0700323A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tube
- punch
- ironing
- extrusion process
- mandrel
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/20—Making uncoated products by backward extrusion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K21/00—Making hollow articles not covered by a single preceding sub-group
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K21/00—Making hollow articles not covered by a single preceding sub-group
- B21K21/08—Shaping hollow articles with different cross-section in longitudinal direction, e.g. nozzles, spark-plugs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K21/00—Making hollow articles not covered by a single preceding sub-group
- B21K21/16—Remodelling hollow bodies with respect to the shape of the cross-section
Definitions
- a subject of the invention is the radial extrusion process combined with inside tube ironing, that is a cold extrusion process, which is reckoned among bulk metal forming processes. It enables tube shaped metal semiproducts to be formed into different final parts or parts that are intended for additional working by machining.
- the invention is classified into the class B 21 D 22/00 of the intemational patent classification.
- the technical problem which the submitted invention is sucessfully solving is a determination and accomplishment of such a process which will enable different axisymmetric tube-shaped parts which are generally characterised by longer cylindrical stem on one side and non-uniform diameter with severe thickening of the wall together with complicated cross-section shapes on another side, to be formed from a simple tube billet, cut from a standard thin-walled or medium-walled tube billet which is preformed in such a way that a larger diameter at one end results.
- Characteristic shapes of parts that can be performed by the process after the invention are shown in Fig. 2, where the shapes on the left from the symmetry axes present the shapes at the beginning of the process and the shapes of the right the states after forming.
- the manufacturing of longish, thin-walled, axial symmetric parts by cold-forming of tube-shaped billets is most preferable when high strength parts are concerned.
- the strength is increased due to fibrous grain structure and deformation hardening arising during cold forming.
- the forming can be completed in a single step with moderate average plastic deformation so a sufficient toughness of the material is still left.
- the tube wall thickness change is not intentional, but results from the changes of other two dimensions, the diameter and the length.
- Such processes are bending, sinking, expanding, bulging by means of pressure medium, spinning, etc.
- the radial extrusion process combined with inside tube ironing after invention is based on forming a tube - shaped workpiece, which my be previously expanded at one end in such a manner, that it is inserted into a properly shaped die. From one side of the die there is a properly shaped punch inside which there is a free axially movable mandrel. While the punch stays retained by a determined force, from the opposite side a counter-punch, the diameter of which is some larger than the tube inner diameter, preforms a working stroke during which the tube wall thickness is reduced. The same time the difference of the material volume is pushed forward, first filling up the clearance between the mandrel and the tube and after that the space between the punch and the die.
- Fig. 1 shematic of the beginning and the end state of radial extrusion process combined with inside tube ironing, performed for forming a hollow rotation - symmetric thin - walled part with non-uniform diameter together with complex cross-section shape
- Fig. 2 tipical shapes of parts that can be formed using the radial extrusion process combined with inside tube ironing after the invention
- Fig. 1 shows the radial extrusion process combined with inside tube ironing, used in a concretly performed example at the beginning and at the end. This process can be carried out on vertical or horizontal hydraulic or mechanical presses with at least two, but preferable three independent actions.
- a free movable mandrel 5 Inside the punch 4 there is a free movable mandrel 5, the diameter of which is for easier entering into the tube smaller than the inner diameter of the tube 1.
- a free movable mandrel instead of the free movable mandrel also a counter-punch with a corresponding prolongation on the upper side the diameter of which corresponds to that of the mandrel 5, could not be used.
- the working stroke is performed by the counter-punch 2 which is widened along the distance Lp so that its diameter is larger than the initial inside diameter of the tube.
- the difference of the volume resulting from the tube wall thinning is pushed forward towards the punch 4, first filling the initial clearance between the tube 1 and the mandrel 5 and thereafeter, with the hydrostatic pressure being considerable increased, also the space B between the punch 4 and the mandrel 5.
- a further extrusion of the material towards the zone A coused by an additional upward movement of the counter-punch 2, causes an additional increase of the hydrostatic pressure in the zone A, up to the value which depends on force Fi by which the punch 4 is retained.
- the punch 4 is pushed upwards for the distance which depends on the additional volume of the material extruded by the punch 2.
- the assistence of friction between the tube 1 and the upward moving mandrel 5 is beneficial, so a good accuracy of such a detail can be achieved with a lower hydrostatic pressure in the zone A.
- an empty space B can also be formed in the die 3.
- the accurate shape of the final part which is determined by the shape of the die 3, the punch 4, the counter-punch 2, the mandrel 5 and the travel of the counter punch 2, can be achieved only if the hydrostatic pressure in the deforming zone A, which is limited by the retaining force Fi, is high enough.
- a special advantage of the process after invention is taht the friction effect, that contributes to the forming force F2 can be controlled even when a longer cylindrical portions of the tube, along which the ironing takes place, are concerned.
- the both diameters can be chosen so, that the phase during which the filling of the clearance between the tube 1 and the mandrel 5 takes place, ends late enough, so that the high hydrostatic pressure in the zone A, that arises after the end of this phase and resulting friction that affects the forming force F2, is present only near the end of the forming stroke.
- Fig. 2 three typical shapes of parts which can be formed using the radial extrusion process combined with inside tube ironing after the invention are shown.
- the cross-sections on the left sides from the symmetry axes presents the workpieces before and on the right after forming.
- Fig. 2a and 2b which can present parts of high-pressure valves
- preforming of tubes by sinking or expanding from original outer diameter to diameters D4 and D1 is foreseen.
- the part shown in Fig. 2c which can present a part of clutch, can be formed from a simple tube with the outer diameter D1 and inner diameter Do.
- Characteristically for the radial extrusion process combined with inside tube ironing after the invention is, that the length of the workpiece during the process remains approximately the same, while the inside diameter of the tube Do is changed to the diameter D2 along the ironing stroke and reduced to the diameter of the mandrel D3, from the end of ironing zone up to the face of the punch 4.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
- Extrusion Of Metal (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SI9300258 | 1993-05-17 | ||
SI9300258A SI9300258A (en) | 1993-05-17 | 1993-05-17 | Process for radial extrusion with tube wall reduction |
PCT/SI1994/000007 WO1994026437A2 (en) | 1993-05-17 | 1994-05-16 | Radial extrusion process combined with inside tube ironing |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0700323A1 true EP0700323A1 (en) | 1996-03-13 |
EP0700323B1 EP0700323B1 (en) | 1997-02-12 |
Family
ID=20431176
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94916475A Expired - Lifetime EP0700323B1 (en) | 1993-05-17 | 1994-05-16 | Radial extrusion process combined with inside tube ironing |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0700323B1 (en) |
JP (1) | JPH08510960A (en) |
DE (2) | DE4342562A1 (en) |
DK (1) | DK0700323T3 (en) |
ES (1) | ES2100068T3 (en) |
RU (1) | RU2116861C1 (en) |
SI (1) | SI9300258A (en) |
WO (1) | WO1994026437A2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6206392B1 (en) | 1998-05-26 | 2001-03-27 | Visteon Global Technologies, Inc. | Stabilizer bar apparatus for use in a vehicle suspension |
CN102941449B (en) * | 2012-11-28 | 2015-02-18 | 隆昌山川精密焊管有限责任公司 | Forming process of thick-wall thin-bottom metal part |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE959876C (en) * | 1952-10-01 | 1957-03-14 | Bosch Gmbh Robert | Process and blank for the non-cutting manufacture of hollow parts made of metal with a stepped sleeve shaft and profiled collar, such as spark plug housings |
FR1112344A (en) * | 1953-11-12 | 1956-03-13 | Kabel U Metallwerke Neumeyer A | Method and device for press-stamping, in particular cold, flanged-shaped parts made of metal, preferably steel |
FR1423292A (en) * | 1965-01-30 | 1966-01-03 | Process for manufacturing tubular elements of metal or other materials, device for carrying out this process or similar process, and the tubular elements conforming to those obtained |
-
1993
- 1993-05-17 SI SI9300258A patent/SI9300258A/en unknown
- 1993-12-14 DE DE19934342562 patent/DE4342562A1/en not_active Withdrawn
-
1994
- 1994-05-16 DE DE69401752T patent/DE69401752T2/en not_active Expired - Fee Related
- 1994-05-16 JP JP6525346A patent/JPH08510960A/en not_active Abandoned
- 1994-05-16 WO PCT/SI1994/000007 patent/WO1994026437A2/en active IP Right Grant
- 1994-05-16 RU RU95122237A patent/RU2116861C1/en active
- 1994-05-16 DK DK94916475T patent/DK0700323T3/en active
- 1994-05-16 EP EP94916475A patent/EP0700323B1/en not_active Expired - Lifetime
- 1994-05-16 ES ES94916475T patent/ES2100068T3/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9426437A3 * |
Also Published As
Publication number | Publication date |
---|---|
JPH08510960A (en) | 1996-11-19 |
EP0700323B1 (en) | 1997-02-12 |
WO1994026437A3 (en) | 1995-01-19 |
DE69401752T2 (en) | 1997-06-05 |
RU2116861C1 (en) | 1998-08-10 |
DE4342562A1 (en) | 1994-11-24 |
ES2100068T3 (en) | 1997-06-01 |
DK0700323T3 (en) | 1997-07-28 |
SI9300258A (en) | 1995-02-28 |
DE69401752D1 (en) | 1997-03-27 |
WO1994026437A2 (en) | 1994-11-24 |
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