US2778494A - Extrusion apparatus for thin-walled hollow tubing - Google Patents
Extrusion apparatus for thin-walled hollow tubing Download PDFInfo
- Publication number
- US2778494A US2778494A US326428A US32642852A US2778494A US 2778494 A US2778494 A US 2778494A US 326428 A US326428 A US 326428A US 32642852 A US32642852 A US 32642852A US 2778494 A US2778494 A US 2778494A
- Authority
- US
- United States
- Prior art keywords
- ram
- disc
- thin
- extrusion apparatus
- hollow tubing
- 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
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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
- B21C26/00—Rams or plungers; Discs therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
- Y10T29/49833—Punching, piercing or reaming part by surface of second part
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
- Y10T29/49908—Joining by deforming
- Y10T29/49925—Inward deformation of aperture or hollow body wall
- Y10T29/49934—Inward deformation of aperture or hollow body wall by axially applying force
Definitions
- the present invention seeks to overcome these difliculties.
- one object of the present invention to provide a substantially thin disc, projecting over it-s frontal surface, on the press ram which remains in Ithe hollow body as a lost disc after the forming operations; thereby then resulting in a certain play between the inner wall of the hollow body and the ram so that it can be extracted without effort.
- pressure discs of 'greater thickness for example about 60 mm. thickness
- These consist of expensive heat resisting tool steel, as they are intended to be used for a large number of pressing operations.
- the disc remains in the formed part-i. e. is only used once-fairly thin thick-- nesses are sufficient and also the material need not be of such high value.
- a cap sheet metal hood
- the thickness of the disc or cap mounted in front is generally comparatively slight, it will be advisable for it to be cooled during the forming operation with a suitable cooling liquid fed and discharged through the ram.
- Figure l is a longitudinal section through the relevant parts of a forming press at the beginning of the pressing operation, with the use of ⁇ a lost disc;
- Fig. 2 is a similar view at a later stage at the same operation
- Fig. 3 is a view similar -to Fig. 2 but showing the use of a sheet metal hood instead of the flat disc;
- Figs. 4 and 5 are similar views showing the use of a round of sheet metal mounted in front of the ram.
- a cylindrical holder 1 of a forming press (Fig. l) is sealed oi by a matrix 2, which has a discharge aperture 3.
- a blank 4 which has a shallow central bore 6 on its frontal surface turned towards the ram 5, is inserted into the holder 1.
- a pressure disc 7 is inserted into the bore 6 so ⁇ as to be mounted in front of the ram 5.
- the ram has on its frontal surface radially extending cooling grooves 8 which communicate with feeding and discharge channels 9 for the cooling liquid.
- the feeding and passage channels 9 and cooling grooves 8 are shown in the embodiment disclosed in Figs. 1 and 2 only, it is to be understood that such cooling grooves may be provided also in the ram 5 of Figs. 3 to 5, disclosing the other two embodiments, described below.
- a sheet metal hood 13 is mounted in front of the ram 5 instead of the disc 7.
- the iiange 14 of this hood overlaps the frontal edge of the punch.
- the thickness of the flange 14 determines the clearance 12 between the wall 11 and the punch S.
- a deformable sheet metal disc or round plate 15 may be used (Fig. 4). This round plate is disposed in front of the ram 5; and the front edge region 16 of the round plate 15 (Fig. 5) is anged backwards during the pressing to form a hood over the 4front edge of the ram.
- a reciprocating ram having passages extending longitudinally therethrough, grooves disposed in the front face of :the said ram, the said passages terminating into said grooves, the latter bearing against the said auxiliary blank, the said passages and grooves being adapted to pass a cooling medium through the said ram for cooling the ram face and the said auxiliary blank.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Description
Jan., 22, i957 A. KREIDLER 778,494
EXTRUSION APPARATUS FOR THIN-WALLED HOLLOW TUBING Filed nec. 17, 1952 United States Patent Fice.
EXTRUSION APPARATUS FOR THIN-WALLED HOLLOW TUBING Alfred Kreidler, Stuttgart, Germany Application December 17, 1952, Serial No. 326,428 Claims priority, application Germany December 31, 1951 1 Claim. (Cl. 207-9) The invention concerns the production of hollow, especially thin-walled bodies by forming. It is also concerned with the production of a sleeve-shaped body, in which the material for the formation of the wall of the sleeve rises round the ram in the ow forming process (Becher-flow pressing) and it can also concern the forming by punching of a hollow body by a ram in the die penetrating into the bar, or a hollow body with stranddike extensions by forming, in which the shell of the bar to be extruded remains as the wall of the hollow body, or finally, any desired combination of two or all three of the above possibilities. The process according to the invention may be considered for hot forming and for cold forming.
ln all these processes there arises a difficulty that the press ram can only be removed from the finished hollow body with diiiiculty. The present invention seeks to overcome these difliculties.
It is, therefore, one object of the present invention to provide a substantially thin disc, projecting over it-s frontal surface, on the press ram which remains in Ithe hollow body as a lost disc after the forming operations; thereby then resulting in a certain play between the inner wall of the hollow body and the ram so that it can be extracted without effort.
The use of pressure discs of 'greater thickness, for example about 60 mm. thickness, is known in itself. These consist of expensive heat resisting tool steel, as they are intended to be used for a large number of pressing operations. For the present case, where the disc remains in the formed part-i. e. is only used once-fairly thin thick-- nesses are sufficient and also the material need not be of such high value.
It is another preferred object of the present invention to provide a cap (sheet metal hood) over-lapping the ram with its edges which can be used as the lost disc. In order to keep the disc or cap central with respect to the bar so that equal thickness of the wall may be obtained around the hollow body, it is expedient to use a blank which is provided on its frontal surface turned towards the ram with a flat central shallow bore for the reception of the disc or cap.
It is still another object of the present invention to provide a disc of sheet metal to be disposed in front of the ram, the edge of this disc projecting beyond the ram being flanged over the frontal edge of the punch at the beginning of the pressing operation, like a cap.
As the thickness of the disc or cap mounted in front is generally comparatively slight, it will be advisable for it to be cooled during the forming operation with a suitable cooling liquid fed and discharged through the ram.
lt is therefore, still another object of the present inven- 2,778,494 Patented*y J'a-n. 22', 1957' tion in which the ram, is expediently provided onl its frontal surface-with coolingA grooves extending spirally or radially, for example, into which longitudinal bores empty for the feeding and discharge of the cooling fluid.
With these and other objects in view which will become apparent in they following detailed description, the present invention Will be clearly understood in connection with the accompanying drawings, in which:
Figure l is a longitudinal section through the relevant parts of a forming press at the beginning of the pressing operation, with the use of `a lost disc;
Fig. 2 is a similar view at a later stage at the same operation;
Fig. 3 is a view similar -to Fig. 2 but showing the use of a sheet metal hood instead of the flat disc; and
Figs. 4 and 5 are similar views showing the use of a round of sheet metal mounted in front of the ram.
A cylindrical holder 1 of a forming press (Fig. l) is sealed oi by a matrix 2, which has a discharge aperture 3. A blank 4, which has a shallow central bore 6 on its frontal surface turned towards the ram 5, is inserted into the holder 1. A pressure disc 7 is inserted into the bore 6 so `as to be mounted in front of the ram 5. The ram has on its frontal surface radially extending cooling grooves 8 which communicate with feeding and discharge channels 9 for the cooling liquid. Although the feeding and passage channels 9 and cooling grooves 8 are shown in the embodiment disclosed in Figs. 1 and 2 only, it is to be understood that such cooling grooves may be provided also in the ram 5 of Figs. 3 to 5, disclosing the other two embodiments, described below.
When the ram 5 is lowered with the disc 7 (Fig. 2) on the one hand a strand-like extension 8 is forced through the aperture 3 of the matrix 2, whilst on the other hand the wall 11 of the hollow body to be produced remains in the holder. As a result of the difference in diameter between the disc 7 and the ram 5, a clearance 12 remains between the latter and the remaining wall 11. This clearance allows lthe ram 5 to be withdrawn immediately after the completion of the forming operation, whilst the disc 7 remains in the pressed piece as a lost disc.
In a variation (Fig. 3) a sheet metal hood 13 is mounted in front of the ram 5 instead of the disc 7. The iiange 14 of this hood overlaps the frontal edge of the punch. The thickness of the flange 14 determines the clearance 12 between the wall 11 and the punch S.
Finally, a deformable sheet metal disc or round plate 15 may be used (Fig. 4). This round plate is disposed in front of the ram 5; and the front edge region 16 of the round plate 15 (Fig. 5) is anged backwards during the pressing to form a hood over the 4front edge of the ram.
While I have disclosed several embodiments of the present invention, it is to be understood that these embodiments :are given by example only and not in a limiting sense, the scope of the present invention being determined by the objects and the claim.
l claim:
In a forming press for producing hollow workpieoes by pres-sing out the core from solid main blanks by means of a relatively thin auxiliary blank disposed on the face of the said main blank which is subjected to pressure, a reciprocating ram having passages extending longitudinally therethrough, grooves disposed in the front face of :the said ram, the said passages terminating into said grooves, the latter bearing against the said auxiliary blank, the said passages and grooves being adapted to pass a cooling medium through the said ram for cooling the ram face and the said auxiliary blank.
References Cited in the le of this patent UNITED STATES PATENTS Born Nov. 14, 1933 Staples Feb. 18, 1936 Singer Mar. 31, 1936 Friden Nov. 21, 1939 Hill Feb. 11, 1941 Poux Oct. 19, 1948
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2778494X | 1951-12-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2778494A true US2778494A (en) | 1957-01-22 |
Family
ID=7998213
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US326428A Expired - Lifetime US2778494A (en) | 1951-12-31 | 1952-12-17 | Extrusion apparatus for thin-walled hollow tubing |
Country Status (1)
Country | Link |
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US (1) | US2778494A (en) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2893277A (en) * | 1957-07-25 | 1959-07-07 | Beisner Karl | Process and tool for perforating ingots |
US3041718A (en) * | 1957-10-18 | 1962-07-03 | Metal Box Co Ltd | Manufacture of aluminium containers |
US3079680A (en) * | 1959-07-29 | 1963-03-05 | Thompson Ramo Wooldridge Inc | Method of making sockets |
US3131814A (en) * | 1957-06-14 | 1964-05-05 | Hydraulik Gmbh | Cooling arrangement for extrusion presses |
US3157282A (en) * | 1959-04-23 | 1964-11-17 | Schloemann Ag | Cooling of press discs in extrusion presses |
US3172536A (en) * | 1961-10-20 | 1965-03-09 | Yorkshire Imp Metals Ltd | Extrusion of metals of hollow section |
US3187217A (en) * | 1959-10-28 | 1965-06-01 | Commissariat Energie Atomique | Amplitude analysing spectrometer |
US3196648A (en) * | 1962-04-30 | 1965-07-27 | Dow Chemical Co | Impact extrusion process |
US3222761A (en) * | 1957-11-29 | 1965-12-14 | Arrowhead Eng Corp | Process of forming cup-shaped articles |
US3235946A (en) * | 1957-11-18 | 1966-02-22 | Star Machine Inc | Process of fabricating piston heads for hydraulic brake cylinders |
US20130205862A1 (en) * | 2012-02-09 | 2013-08-15 | Mitsubishi Materials Corporation | Die for press working |
DE102014102448A1 (en) | 2014-02-25 | 2015-08-27 | Langenstein & Schemann Gmbh | Apparatus and method for forming, in particular extrusion, of metallic workpieces |
Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE271378C (en) * | ||||
FR516653A (en) * | 1920-06-08 | 1921-04-23 | Georges Brehamet | Process for forging parts of all sizes comprising a head and one or more rods |
US1935286A (en) * | 1930-09-30 | 1933-11-14 | Krupp Ag Grusonwerk | Extrusion press for the production of rod or tube-shaped bodies |
CH170811A (en) * | 1931-06-27 | 1934-07-31 | Siemens Ag | Process for removing the impurities that collect at the top of the transducer in vertical extrusion presses, in particular lead cable presses. |
US2031014A (en) * | 1932-04-23 | 1936-02-18 | Habirshaw Cable And Wire Corp | Machine for making electrical cables |
US2036182A (en) * | 1933-03-01 | 1936-03-31 | Tubus A G | Extrusion method |
CH198775A (en) * | 1937-04-12 | 1938-07-15 | Limited Tube Ind Participation | Process for the production of cup-shaped metal hollow bodies by pressing a mandrel into a block inserted in a die. |
US2180628A (en) * | 1936-04-30 | 1939-11-21 | Sun Tube Corp | Method of making collapsible containers |
US2231761A (en) * | 1938-07-02 | 1941-02-11 | Callenders Cable & Const Co | Press for the extrusion of metals |
DE720543C (en) * | 1937-07-13 | 1942-05-08 | Kabel Und Metallwerke Neumeyer | Process for the production of bowls from round blanks or discs made of steel, which can be processed into hollow bodies by cold spraying |
FR921713A (en) * | 1945-05-18 | 1947-05-16 | Improvements to and relating to time or time relays or switches | |
US2451773A (en) * | 1945-02-02 | 1948-10-19 | Noel J Poux | Terminal connection and method of making the same |
GB625919A (en) * | 1945-10-18 | 1949-07-06 | Thomas Jerome Masse | Improvements in and relating to the manufacture of metal shells by impact extrusion |
US2738064A (en) * | 1951-12-29 | 1956-03-13 | Kreidler Alfred | Process for the production of sleeveshaped, specially thin-walled, hollow bodies with one or more strand-like extensions |
-
1952
- 1952-12-17 US US326428A patent/US2778494A/en not_active Expired - Lifetime
Patent Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE271378C (en) * | ||||
FR516653A (en) * | 1920-06-08 | 1921-04-23 | Georges Brehamet | Process for forging parts of all sizes comprising a head and one or more rods |
US1935286A (en) * | 1930-09-30 | 1933-11-14 | Krupp Ag Grusonwerk | Extrusion press for the production of rod or tube-shaped bodies |
CH170811A (en) * | 1931-06-27 | 1934-07-31 | Siemens Ag | Process for removing the impurities that collect at the top of the transducer in vertical extrusion presses, in particular lead cable presses. |
US2031014A (en) * | 1932-04-23 | 1936-02-18 | Habirshaw Cable And Wire Corp | Machine for making electrical cables |
US2036182A (en) * | 1933-03-01 | 1936-03-31 | Tubus A G | Extrusion method |
US2180628A (en) * | 1936-04-30 | 1939-11-21 | Sun Tube Corp | Method of making collapsible containers |
CH198775A (en) * | 1937-04-12 | 1938-07-15 | Limited Tube Ind Participation | Process for the production of cup-shaped metal hollow bodies by pressing a mandrel into a block inserted in a die. |
DE720543C (en) * | 1937-07-13 | 1942-05-08 | Kabel Und Metallwerke Neumeyer | Process for the production of bowls from round blanks or discs made of steel, which can be processed into hollow bodies by cold spraying |
US2231761A (en) * | 1938-07-02 | 1941-02-11 | Callenders Cable & Const Co | Press for the extrusion of metals |
US2451773A (en) * | 1945-02-02 | 1948-10-19 | Noel J Poux | Terminal connection and method of making the same |
FR921713A (en) * | 1945-05-18 | 1947-05-16 | Improvements to and relating to time or time relays or switches | |
GB625919A (en) * | 1945-10-18 | 1949-07-06 | Thomas Jerome Masse | Improvements in and relating to the manufacture of metal shells by impact extrusion |
US2738064A (en) * | 1951-12-29 | 1956-03-13 | Kreidler Alfred | Process for the production of sleeveshaped, specially thin-walled, hollow bodies with one or more strand-like extensions |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3131814A (en) * | 1957-06-14 | 1964-05-05 | Hydraulik Gmbh | Cooling arrangement for extrusion presses |
US2893277A (en) * | 1957-07-25 | 1959-07-07 | Beisner Karl | Process and tool for perforating ingots |
US3041718A (en) * | 1957-10-18 | 1962-07-03 | Metal Box Co Ltd | Manufacture of aluminium containers |
US3235946A (en) * | 1957-11-18 | 1966-02-22 | Star Machine Inc | Process of fabricating piston heads for hydraulic brake cylinders |
US3222761A (en) * | 1957-11-29 | 1965-12-14 | Arrowhead Eng Corp | Process of forming cup-shaped articles |
US3157282A (en) * | 1959-04-23 | 1964-11-17 | Schloemann Ag | Cooling of press discs in extrusion presses |
US3079680A (en) * | 1959-07-29 | 1963-03-05 | Thompson Ramo Wooldridge Inc | Method of making sockets |
US3187217A (en) * | 1959-10-28 | 1965-06-01 | Commissariat Energie Atomique | Amplitude analysing spectrometer |
US3172536A (en) * | 1961-10-20 | 1965-03-09 | Yorkshire Imp Metals Ltd | Extrusion of metals of hollow section |
US3196648A (en) * | 1962-04-30 | 1965-07-27 | Dow Chemical Co | Impact extrusion process |
US20130205862A1 (en) * | 2012-02-09 | 2013-08-15 | Mitsubishi Materials Corporation | Die for press working |
DE102014102448A1 (en) | 2014-02-25 | 2015-08-27 | Langenstein & Schemann Gmbh | Apparatus and method for forming, in particular extrusion, of metallic workpieces |
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