EP0323456B1 - Process and apparatus for the cold shaping of pipes or fittings, and articles thus obtained - Google Patents
Process and apparatus for the cold shaping of pipes or fittings, and articles thus obtained Download PDFInfo
- Publication number
- EP0323456B1 EP0323456B1 EP87904388A EP87904388A EP0323456B1 EP 0323456 B1 EP0323456 B1 EP 0323456B1 EP 87904388 A EP87904388 A EP 87904388A EP 87904388 A EP87904388 A EP 87904388A EP 0323456 B1 EP0323456 B1 EP 0323456B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pipe
- radial
- radial walls
- walls
- fitting
- 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.)
- Expired - Lifetime
Links
Images
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
- B21D17/00—Forming single grooves in sheet metal or tubular or hollow articles
- B21D17/02—Forming single grooves in sheet metal or tubular or hollow articles by pressing
-
- 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
- B21D53/00—Making other particular articles
- B21D53/24—Making other particular articles nuts or like thread-engaging members
Definitions
- the present invention refers to a process and apparatus for the cold shaping or cold forming of pipes or metallic pipe fittings.
- Shaped pipes or pipe fittings are normally obtained by casting or through a mechanical process, therefore they are expensive.
- the attempt to produce these articles made of plastics has resulted in pieces having a mechanical resistance definitely unsuitable for the most common uses.
- FR-A-1 393 986 provides for a process, as defined in the pre-characterizing part of the claim 1, consisting of applying a longitudinal pressure on the cylindrical walls of a piece of pipe to obtain a collar with a thickness double compared to the one of the cylindrical walls.
- the collar in a second step is radially compressed from the outside on six sides, since the surfaces are simultaneously closed both internally and externally, to form a massive hexagon.
- FR-A-1 393 986 also discloses an apparatus, as defined in the pre-characterizing part of claim 3, for carrying out the above process.
- the aim of the present invention is to produce pipes or metallic pipe-fittings of various shapes which are much more economical than the prior art ones, while still maintaining their sturdiness unaltered.
- the radially extending walls can be formed by shaped radial die slides or inserts acting on the pipe or pipe-fitting wall.
- the obtained articles are preferably, but not limitedly: pipes or pipe-fittings having a same diameter at both ends or different diameters and with a polygonal or circular collar; pipes or pipe-fittings with ring at their ends.
- These hose fittings can have circular collars capable of being sealed with conical or flat coupling surfaces.
- Figure 1 and 2 show the working phases on a pipe section 17.
- This pipe section is inserted in the dies 20 and 20a provided with abutments 13 and is compressed axially, thus obtaining first, in a known way, through cone 29, the enlargement of one of its portions, then the forming of radial walls 22 and 22a. These latter are them shaped by inserts 40 acting radially to the pipe section 17.
- the pipe and particularly the internal base of each radial wall 22 and 22a is supported by a support 30 inside the pipe, preferably a plug.
- This internal support 30 is provided with at least a cone 29 which carries out the shaping of the pipe and supports the internal base of the radial walls 22 and 22a.
- FIGs 3, 4 and 5 show more in detail the above mentioned working phases; as shown in Fig. 3 a portion of pipe 17 is first enlarged, then, continuing the compression by moving the dies 20 and 20a, the radial walls 22 and 22a are formed (Fig. 4). During this phase the approach of the two dies 20 and 20a is carried out until the distance between the extreme ends 21 of the dies is equal to twice the thickness of the pipe to be shaped.
- Fig. 5 shows the shaping of zone 10 connecting the radial walls 22 and 22a.
- the two dies 20 and 20a are left free to move away until the distance between the extreme sides 21 is equal to the thickness required for the collar 11.
- the inserts 40 have front sides 40a having a width equal to the collar thickness.
- Fig. 6 shows a pipe-fitting 18 having a polygonal collar 11 and two portions having different diameter
- Fig. 7 shows a pipe-fitting 19 similar to the one in Fig. 6, but having equal diameter at both ends.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Moulding By Coating Moulds (AREA)
- Forging (AREA)
Abstract
Description
- The present invention refers to a process and apparatus for the cold shaping or cold forming of pipes or metallic pipe fittings.
- Shaped pipes or pipe fittings are normally obtained by casting or through a mechanical process, therefore they are expensive. The attempt to produce these articles made of plastics has resulted in pieces having a mechanical resistance definitely unsuitable for the most common uses.
- FR-A-1 393 986 provides for a process, as defined in the pre-characterizing part of the claim 1, consisting of applying a longitudinal pressure on the cylindrical walls of a piece of pipe to obtain a collar with a thickness double compared to the one of the cylindrical walls. The collar, in a second step is radially compressed from the outside on six sides, since the surfaces are simultaneously closed both internally and externally, to form a massive hexagon. FR-A-1 393 986 also discloses an apparatus, as defined in the pre-characterizing part of claim 3, for carrying out the above process.
- The aim of the present invention is to produce pipes or metallic pipe-fittings of various shapes which are much more economical than the prior art ones, while still maintaining their sturdiness unaltered.
- The above mentioned aim has been achieved by a process as specified in claim 1 and an apparatus as claimed in claim 3.
- The process of the invention for cold forming of pipes or pipe-fittings, according to which a pipe or pipe-fitting is inserted into a die and two radially extending, interconnected walls - namely perpendicular to the axis of the pipe or pipe-fitting - are formed, then substantially radially inwardly acting forces are applied on zones adjacent to said radial walls, said zones being adjacent to the radially outermost ends of said radial walls which are internally supported, is characterized in that said radial walls have at least one side not supported and that the reaction forces to said applied radial forces are provided by means of said radial walls, the base of each radial wall being supported by an internal support, said radial walls acting as only means of contrast to these forces, being the ratio height/thickness of said radial walls such that their buckling limit load is lower than their combined bending and compressive stress. In other words, the ratio height/thickness of the walls is such that said walls do not bend, when undergoing a radial compression.
- The radially extending walls can be formed by shaped radial die slides or inserts acting on the pipe or pipe-fitting wall.
- The obtained articles are preferably, but not limitedly: pipes or pipe-fittings having a same diameter at both ends or different diameters and with a polygonal or circular collar; pipes or pipe-fittings with ring at their ends. These hose fittings can have circular collars capable of being sealed with conical or flat coupling surfaces.
- The process essential steps, the apparatus according to a preferred but not limiting embodiment of the invention and the articles thereby obtained, are illustrated in the enclosed drawings, therein:
- Fig. 1 is a plan view of an apparatus for the shaping of a pipe or pipe-fitting in two successive operating steps;
- Fig. 2 is a sectional view along line 2-2 of Fig. 1;
- Fig. 3 shows the first shaping step of a pipe which will have ends of different diameters;
- Fig. 4 shows a forming phase of two adjacent radial walls on the pipe illustrated in Fig. 3;
- Fig. 5 shows the shaping phase of the connecting zone between the radial walls formed in the phase illustrated in Fig. 4; and
- Figs. 6 and 7 show a part-sectional side view of two embodiments of the obtained pipe-fittings.
- Figure 1 and 2 show the working phases on a
pipe section 17. This pipe section is inserted in thedies abutments 13 and is compressed axially, thus obtaining first, in a known way, throughcone 29, the enlargement of one of its portions, then the forming ofradial walls inserts 40 acting radially to thepipe section 17. During these working phases, the pipe and particularly the internal base of eachradial wall support 30 inside the pipe, preferably a plug. Thisinternal support 30 is provided with at least acone 29 which carries out the shaping of the pipe and supports the internal base of theradial walls - Figures 3, 4 and 5 show more in detail the above mentioned working phases; as shown in Fig. 3 a portion of
pipe 17 is first enlarged, then, continuing the compression by moving thedies radial walls dies extreme ends 21 of the dies is equal to twice the thickness of the pipe to be shaped. - Fig. 5 shows the shaping of
zone 10 connecting theradial walls insert 40 presses on the radial wall, the two dies 20 and 20a are left free to move away until the distance between theextreme sides 21 is equal to the thickness required for thecollar 11. Theinserts 40 havefront sides 40a having a width equal to the collar thickness. - Embodiments of the obtained articles are shown in Figs. 6 and 7. Fig. 6 shows a pipe-
fitting 18 having apolygonal collar 11 and two portions having different diameter and Fig. 7 shows a pipe-fitting 19 similar to the one in Fig. 6, but having equal diameter at both ends.
Claims (3)
- A process for cold forming of pipes or pipe-fittings, according to which a pipe or pipe-fitting is inserted into a die and two radially extending, interconnected walls (22,22a) - namely perpendicular to the axis (X-X) of the pipe or pipe-fitting - are formed, then substantially radially inwardly acting forces are applied on zones (10) adjacent to said radial walls (22,22a), said zones being adjacent to the radially outermost ends of said radial walls which are internally supported, characterized in that said radial walls (22,22a) have at least one side not supported and that the reaction forces to said applied radial forces are provided by means of said radial walls (22,22a), the base of each radial wall being supported by an internal support (30), said radial walls acting as only means of contrast to these forces, being the ratio height/thickness of said radial walls such that their buckling limit load is lower than their combined bending and compressive stress.
- A process as in claim 1, characterized in that during application of said radial forces the die (20,20a) is free to axially move.
- An apparatus for cold forming of a pipe or pipe-fitting, comprising a die (20,20a) capable of forming two radial walls (22,22a) on the pipe or pipe-fitting; a shaping member (40) provided to act in succession, in a substantially radial direction, on a zone (10) adjacent to the radial walls (22,22a); an internal support (30), which can be inserted into the pipe or pipe-fitting to be shaped and which internally supports the base of the radial walls (22,22a), characterized in that the die comprises two opposed portions (20,20a) which are only axially movable and are free to move when the shaping member (40) comes into contact with said zone (10), the shaping member being capable of acting radially inwards to perform the forming action.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT20988/86A IT1191835B (en) | 1986-06-30 | 1986-06-30 | PROCEDURE AND RELATED EQUIPMENT FOR COLD PRODUCTION OF VARIOUS TYPE SHAPING ON PIPES OR FITTINGS AND PRODUCTS SO OBTAINED |
IT2098886 | 1986-06-30 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0323456A1 EP0323456A1 (en) | 1989-07-12 |
EP0323456B1 true EP0323456B1 (en) | 1993-02-03 |
Family
ID=11175029
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87904388A Expired - Lifetime EP0323456B1 (en) | 1986-06-30 | 1987-06-29 | Process and apparatus for the cold shaping of pipes or fittings, and articles thus obtained |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0323456B1 (en) |
AU (1) | AU7644487A (en) |
DE (1) | DE3784070T2 (en) |
IT (1) | IT1191835B (en) |
WO (1) | WO1988000099A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10031989B4 (en) | 2000-06-30 | 2007-08-16 | Witzig & Frank Gmbh | Method and device for producing press fittings made of steel, in particular stainless steel |
ATE528804T1 (en) * | 2004-01-02 | 2011-10-15 | Water Gremlin Co | BATTERY PART |
BR112020021221A2 (en) | 2018-12-07 | 2021-07-27 | Water Gremlin Company | battery part, method for making a battery part, and system for making a battery part |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR402947A (en) * | 1908-09-12 | 1909-10-20 | Eriel D'usines A Gaz | Connection sleeve and its manufacturing process |
FR446337A (en) * | 1911-09-07 | 1912-12-02 | Victor Hawkins Pankhurst | Corrugated jacket for internal combustion engines |
US1854000A (en) * | 1929-07-13 | 1932-04-12 | Fulford Mfg Co | Method and apparatus for making contact pins |
GB515745A (en) * | 1938-06-07 | 1939-12-13 | Ernest Haslam | Improvements in or relating to tools used in flanging tubes |
FR1393986A (en) * | 1963-03-04 | 1965-04-02 | Nautchno I I Pi Avtomobilnovo | Manufacturing process for multi-faceted hollow parts |
US3866457A (en) * | 1973-08-24 | 1975-02-18 | Caterpillar Tractor Co | Method and apparatus for tube forming |
JPS5659555A (en) * | 1979-10-18 | 1981-05-23 | Komatsu Ltd | Production of joint |
DE3409549A1 (en) * | 1984-03-15 | 1985-09-26 | Gesenkschmiede Schneider Gmbh, 7080 Aalen | Method for the production of flanges or collars on hollow parts |
-
1986
- 1986-06-30 IT IT20988/86A patent/IT1191835B/en active
-
1987
- 1987-06-29 EP EP87904388A patent/EP0323456B1/en not_active Expired - Lifetime
- 1987-06-29 AU AU76444/87A patent/AU7644487A/en not_active Abandoned
- 1987-06-29 DE DE8787904388T patent/DE3784070T2/en not_active Expired - Fee Related
- 1987-06-29 WO PCT/EP1987/000352 patent/WO1988000099A1/en active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
IT8620988A0 (en) | 1986-06-30 |
WO1988000099A1 (en) | 1988-01-14 |
AU7644487A (en) | 1988-01-29 |
IT8620988A1 (en) | 1987-12-30 |
DE3784070D1 (en) | 1993-03-18 |
EP0323456A1 (en) | 1989-07-12 |
IT1191835B (en) | 1988-03-23 |
DE3784070T2 (en) | 1993-07-01 |
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