EP0383052B1 - Verfahren und Vorrichtung zum Sichern der Masshaltigkeit einer pyramidenstumpfförmigen Dosenzarge - Google Patents

Verfahren und Vorrichtung zum Sichern der Masshaltigkeit einer pyramidenstumpfförmigen Dosenzarge Download PDF

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Publication number
EP0383052B1
EP0383052B1 EP90101193A EP90101193A EP0383052B1 EP 0383052 B1 EP0383052 B1 EP 0383052B1 EP 90101193 A EP90101193 A EP 90101193A EP 90101193 A EP90101193 A EP 90101193A EP 0383052 B1 EP0383052 B1 EP 0383052B1
Authority
EP
European Patent Office
Prior art keywords
inductors
bodies
shaped
heating
shaping
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
Application number
EP90101193A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0383052A1 (de
Inventor
Kurt Alznauer
Michael Baumgartner
Werner Boegli
Jürgen Brauer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Elpatronic AG
Original Assignee
Elpatronic AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Elpatronic AG filed Critical Elpatronic AG
Priority to AT90101193T priority Critical patent/ATE94438T1/de
Publication of EP0383052A1 publication Critical patent/EP0383052A1/de
Application granted granted Critical
Publication of EP0383052B1 publication Critical patent/EP0383052B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
    • B21D51/2646—Of particular non cylindrical shape, e.g. conical, rectangular, polygonal, bulged

Definitions

  • the invention relates to a method for ensuring the dimensional accuracy of a truncated pyramid-shaped can frame, in the manufacture of which a rectangular sheet metal blank is cylindrically shaped, longitudinally welded and then deformed in two steps, the frame being oval in the first step and in the second step a regular truncated pyramid in cross section is deformed with rounded side edges.
  • the invention also relates to a device for carrying out the method.
  • the method and the device are based on a known method and a known device for producing truncated pyramid-shaped can bodies according to DE-A-37 25 186.
  • circular cylindrical frames are formed from rectangular sheet metal blanks by rounding and longitudinal seam welding. In a first spreading operation, these are widened in an oval manner over their entire length. The frames are then deformed into the truncated pyramid in a second expansion step. So that truncated pyramid-shaped can frames with front edges that are well suited for flanging a lid or base are created, the frames are put under tension at their front edge regions when they are expanded in such a way that these edge regions do not become wavy and therefore connect well to a can lid or base to let.
  • the nominal dimension of the flare height is for cans such as Recording of corned beef can be used, 3 mm.
  • the tolerance is ⁇ 0.1 mm.
  • the object of the invention is to provide a method and a device for its implementation, with which the dimensional accuracy of a truncated pyramid-shaped can frame can be optimally ensured.
  • This object is achieved in a method of Type mentioned initially solved in that the frame is partially heated after the first, but before the second step, the heating extending to subareas of the frame that later extend in the two wide side surfaces and / or in the two narrow side surfaces of the truncated pyramid are located.
  • An apparatus for carrying out this method is based on a machine with two shaping stages, of which the first stage, which receives cylindrically shaped, longitudinally welded frames and forms oval cones, has at least one transfer station from which the frames are transferred to the second stage, which the Frames shaped like a truncated pyramid, the first shaping step having at least one first expanding mandrel for the oval conical shaping of the frames and the second shaping step having at least one second expanding mandrel with four expandable segment rods provided with a radius on the outside.
  • the device of this type is characterized according to the invention in that two heat sources are arranged in front of the transfer station of the first shaping stage, which are diametrically opposed to one another when the frame is moved into the heating position and are at a distance from the frame. Since the heating takes place before the second and after the first step, the sheet has the more favorable processing temperature at the beginning of the second step.
  • Tin boxes made of tinplate i.e. tinplate is heated to a temperature which is definitely below the melting temperature of the tin, i.e. is below 231.85 ° C.
  • a temperature in the range of 60-70 ° C was measured in a test facility. With a production rate of 150 can frames per minute, there is a downtime of approx. 2/10 seconds in which the frame is heated to the above-mentioned temperature. As a result of this heating, the sheet metal of the frame can be deformed more easily and the dimensional stability can be secured more easily than in the known case described above.
  • the heating takes place inductively, and inductors connected to a high-frequency generator are used as the heat source.
  • Inductive heating offers the most practical way of achieving the most favorable processing temperature for the hot forming of the sheet in the short time available of only approx. 2/10 seconds.
  • a radiant heat source, a flame or the like could also be used as a heat source, but this would have to be specially designed so that the required high heating rate can be achieved and scale and exhaust gases avoided.
  • the tools used to deform the can frames themselves must not be heated in order not to endanger their service life. Induction heating is therefore preferred.
  • the partial heating extends to subareas of the frame which are later between the rounded side edges of the truncated pyramid, are at a distance from them and are closer to the base surface than to the top surface of the truncated pyramid.
  • the method and the device according to the invention can be designed such that the frame is heated from the outside or from the inside. Heating from the outside is currently preferred because it is technically easier to implement, because in this case no special heat insulation between the heat source and the spreading tool is required. Tests have shown that the dwell time of the frame in its heating position is sufficiently short so that the spreading tools hardly heat themselves. The thermal energy remains in the can frames, which leave the expanding tool after only about 2/10 seconds.
  • the device according to the invention is preferably designed in such a way that the inductors are firmly attached, flat loops which are considerably narrower than the height of the frames, and that the frames can be moved intermittently into the heating position between the inductors.
  • this enables the inductors to be continuously supplied with high-frequency alternating current.
  • the device according to the invention can be designed such that the inductors can be adjusted at least in the direction of the height and the circumference of the frame, so that the best heating position can be set in a simple manner.
  • Fig. 1 shows an overall view of a machine for producing truncated pyramid-shaped frames 10 for cans for receiving corned beef or the like.
  • the machine is provided with a device for partial inductive heating of the frames 10, which consists of a high-frequency generator 12 and two inductors 14 connected to it, of which only the upper one is visible in FIG. 1.
  • the structure of the machine is described here only to the extent that it is for the Ver understanding of the invention is necessary. A more detailed description of the machine can be found in DE-OS 37 25 186.
  • a rectangular sheet metal blank that has been cylindrically shaped is welded in a frame welding machine 16 with a longitudinal seam 18.
  • the cylindrically shaped, longitudinally welded frames 10 are fed to the machine by a longitudinal conveyor 20.
  • a finished, truncated pyramid-shaped frame 10 has the shape that can be seen at the top right in FIG. 1 when it leaves the machine.
  • the truncated pyramid has rounded longitudinal edges.
  • Two longitudinal recesses in its wide side surfaces are of no interest here.
  • the longitudinal seam 18 lies in the middle of one of the two narrow side surfaces of the finished frame 10.
  • the frame 10 goes to the corned beef manufacturer, who provides it with a flanged edge on both ends (so-called Crimped hook) so that the base and lid can be attached to the frame.
  • FIG. 6 shows in detail a cross-sectional view of such a flange connection between the frame 10 and a cover 22.
  • the sheet thickness f is usually 0.25 mm in the case described here.
  • the nominal dimension of the flare height h is 3 mm, the tolerance being ⁇ 0.1 mm.
  • the minimum size of dimension b is 1.1 mm, with a tolerance of 0.2 mm.
  • the longitudinal conveyor 20 conveys the frames 10 at short intervals one after the other into a first shaping stage 24 of the machine.
  • the first shaping stage 24 has a first turntable 28 fastened to a stand 26, which can be rotated about a horizontal axis parallel to the longitudinal conveyor 20.
  • Eight parallel expanding mandrels 30 are fastened to the first rotary table 28 equally spaced.
  • the first turntable 28 can be rotated at intervals of 45 °.
  • Each expanding mandrel 30 has a ring of pivotable segment rods 32 which can be expanded by means of an expanding cylinder 34 in such a way that a frame 10 placed thereon is expanded into an oval conical shape. The greatest expansion takes place on the end face of the frame 10, which is adjacent to a second shaping step 25.
  • the second shaping stage 25 has a second turntable 29 attached to a stand 27, which is also rotatable about a horizontal axis which is parallel to the axis of rotation of the first turntable 28.
  • On the second turntable 29 eight expansion mandrels 31 are fastened equidistantly to its axis of rotation.
  • the second turntable 29 can be rotated synchronously with the first turntable 28, an expanding mandrel 31 being aligned with an expanding mandrel 30 after each rotating cycle.
  • Each expanding mandrel 31 has four segment rods 36, the outer radius of which corresponds to the rounding of the side edges of the truncated pyramid-shaped frame 10.
  • the segment rods 36 can be expanded by means of a spreading cylinder 38.
  • one of the expanding mandrels 30 is in alignment with the longitudinal conveyor 20 in order to form a cylindrically shaped frame 10 therefrom receive.
  • This station of the first shaping stage is designated S1 in FIG. 1.
  • the oval-conical widening of the frame 10 takes place in a station S2 distant from it by 45 °.
  • the first rotary table 28 then arrives in a station designated by S3, in which the frame 10 is heated in the manner described below.
  • the first turntable 28 then arrives at a transfer station SÜ, which is 180 ° away from the station S1.
  • the expanding mandrel 30, which carries the oval-shaped and heated frame 10 is axially opposite one of the expanding mandrels 31 attached to the second rotary table 29.
  • a transfer conveyor (not shown) transfers this frame 10 from the station SÜ to the station opposite it on the second rotary table 29.
  • the oval-shaped and heated frame 10, which is now pushed onto an expanding mandrel 31, reaches a 45 ° angle at the next cycle of the second rotary table 29 distant station, in which the expanding mandrel 31 deforms the frame 10 into the truncated pyramid.
  • this expanding mandrel 31 reaches a last station, where the frame 10 is removed and transferred to a longitudinal conveyor 21.
  • eight truncated pyramid-shaped can bodies 10 are thus produced.
  • the high-frequency generator 12 shown has a high-frequency output power with continuous operation of 5 kW and an operating frequency of approximately 700 kHz.
  • two busbars 40, 41, between which an insulation 42 is provided lead to terminal blocks 44 and 45, respectively.
  • Two inductors 14 are connected to these, which as a hollow copper line lead from the terminal block 44 to a loop-shaped part 14.1, which forms the actual inductor, back to and past the connection blocks 44, 45 to a further loop-shaped part 14.1 and from there back to the connection block 45 leads.
  • coolant lines 48 are connected to the connection blocks 44, 45, which are connected in the connection block 44 to the outgoing copper line or in the connection block 45 to the incoming copper line.
  • the loop-shaped parts 14.1 and 14.2 of the inductors 14 lie diametrically opposite one another when the expanding mandrel 30 is moved into the heating station 53 and are at a distance from the lateral surface of the expanding mandrel 30.
  • the flat loops 14.1, 14.2 are considerably narrower than the height of the frames 10.
  • the inductors 14 are arranged with respect to the expanding mandrel 30 so that they are in the heating position of the frames 10 above the center of their wider sides.
  • Each inductor is adjustable at least in the direction of the height and the circumference of the frame 10, for which purpose a holder 50 is used, to which the upper inductor 14 is detachably fastened in the exemplary embodiment shown.
  • the holder 50 is adjustable perpendicular to the plane of the drawing in FIG. 2.
  • the frame 10 During the expansion process on the second rotary table 29, the frame 10 would be retracted somewhat on its left end in the region of the rounded corners for the reasons mentioned at the outset, that is to say that a protruding convex part would be obtained between the rounded corners, which could hinder the flanging if its Size outside the tolerance of ⁇ 0.1 mm. This indentation of the corners can be counteracted mechanically, but this is possible more effectively and simply with the partial heating of the frames 10 described here.
  • the high-frequency generator 12 used was the type IG 111 W from Plustherm AG, CH-5401 Baden, with the following technical data:

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Induction Heating (AREA)
  • Heat Treatment Of Articles (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)
  • Fencing (AREA)
EP90101193A 1989-02-16 1990-01-22 Verfahren und Vorrichtung zum Sichern der Masshaltigkeit einer pyramidenstumpfförmigen Dosenzarge Expired - Lifetime EP0383052B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90101193T ATE94438T1 (de) 1989-02-16 1990-01-22 Verfahren und vorrichtung zum sichern der masshaltigkeit einer pyramidenstumpffoermigen dosenzarge.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH534/89A CH677742A5 (enrdf_load_stackoverflow) 1989-02-16 1989-02-16
CH534/89 1989-02-16

Publications (2)

Publication Number Publication Date
EP0383052A1 EP0383052A1 (de) 1990-08-22
EP0383052B1 true EP0383052B1 (de) 1993-09-15

Family

ID=4189223

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90101193A Expired - Lifetime EP0383052B1 (de) 1989-02-16 1990-01-22 Verfahren und Vorrichtung zum Sichern der Masshaltigkeit einer pyramidenstumpfförmigen Dosenzarge

Country Status (13)

Country Link
US (1) US4995254A (enrdf_load_stackoverflow)
EP (1) EP0383052B1 (enrdf_load_stackoverflow)
JP (1) JPH0780020B2 (enrdf_load_stackoverflow)
CN (1) CN1013556B (enrdf_load_stackoverflow)
AR (1) AR243786A1 (enrdf_load_stackoverflow)
AT (1) ATE94438T1 (enrdf_load_stackoverflow)
BR (1) BR9000701A (enrdf_load_stackoverflow)
CA (1) CA2009415A1 (enrdf_load_stackoverflow)
CH (1) CH677742A5 (enrdf_load_stackoverflow)
DE (2) DE3911390A1 (enrdf_load_stackoverflow)
DK (1) DK168984B1 (enrdf_load_stackoverflow)
ES (1) ES2046542T3 (enrdf_load_stackoverflow)
SU (1) SU1732808A4 (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6349586B1 (en) 1999-02-23 2002-02-26 Ball Corporation Apparatus and method for annealing container side wall edge for necking
ES2217973A1 (es) * 2003-04-23 2004-11-01 Sommetrade, S.L. "sistema de control de cierre de envases metalicos no redondos".
CN104492988B (zh) * 2014-12-15 2016-06-01 高密天一机械科技有限公司 一种扩孔机

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1910652A (en) * 1930-06-23 1933-05-23 Taylor James Hall Apparatus for making expansion joints in pipes
US2736361A (en) * 1950-05-19 1956-02-28 Kocks Friedrich Machine for expanding tubes
JPS5314661B2 (enrdf_load_stackoverflow) * 1971-10-19 1978-05-19
DE2737730A1 (de) * 1977-08-22 1979-03-08 Schmalbach Lubeca Verfahren und vorrichtung zum herstellen von nahtlosen dosenruempfen
CH673790A5 (enrdf_load_stackoverflow) * 1987-07-07 1990-04-12 Elpatronic Ag

Also Published As

Publication number Publication date
AR243786A1 (es) 1993-09-30
DK40590D0 (da) 1990-02-15
CH677742A5 (enrdf_load_stackoverflow) 1991-06-28
DK40590A (da) 1990-08-17
BR9000701A (pt) 1991-01-22
DE3911390A1 (de) 1990-08-23
CN1045046A (zh) 1990-09-05
JPH02247034A (ja) 1990-10-02
ATE94438T1 (de) 1993-10-15
CN1013556B (zh) 1991-08-21
DK168984B1 (da) 1994-07-25
US4995254A (en) 1991-02-26
DE59002677D1 (de) 1993-10-21
CA2009415A1 (en) 1990-08-16
DE3911390C2 (enrdf_load_stackoverflow) 1992-05-14
ES2046542T3 (es) 1994-02-01
EP0383052A1 (de) 1990-08-22
JPH0780020B2 (ja) 1995-08-30
SU1732808A4 (ru) 1992-05-07

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