Classifications

• • 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
  • B21K1/00—Making machine elements
• • 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
  • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
  • B21D22/14—Spinning
  • B21D22/18—Spinning using tools guided to produce the required profile
• • 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
  • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
  • B21D22/14—Spinning
• • 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
  • B21D51/18—Making hollow objects characterised by the use of the objects vessels, e.g. tubs, vats, tanks, sinks, or the like
  • B21D51/22—Making hollow objects characterised by the use of the objects vessels, e.g. tubs, vats, tanks, sinks, or the like pots, e.g. for cooking
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
  • B21J9/00—Forging presses
  • B21J9/02—Special design or construction
  • B21J9/025—Special design or construction with rolling or wobbling dies
• • 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
  • B21K23/00—Making other articles
  • B21K23/04—Making other articles flanged articles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
  • B21H1/00—Making articles shaped as bodies of revolution
  • B21H1/02—Making articles shaped as bodies of revolution discs; disc wheels

Definitions

• the object of the invention is a process for the manufacture of a cooking pot or pan, such as a frying pan or a kettle, in which the pot is produced from a metal blank by forming techniques.
• the invention is related to equipment intended for the application of the process.
• frying pans and other vessels intended for cooking, have been manufactured from metal blanks by spinning.
• a sheet-like blank is attached to a rotating arbor so that the inner bottom of the produced pan is placed against the supporting surface in the arbor, after which the sides of the pan are formed by bending the edges of the blank against the sides of the arbor which serves as a mould, by using a turning tool.
• the purpose of the invention is to provide a new solution for the manufacture of cooking pots and pans, especially frying pans, but also saucepans and kettles, which is simpler than the known spinning techniques.
• the invention is characterised in that the pot is manufactured by roll forming by using a lower tool that rotates around its axis and the form face of which is designed so that it corresponds to the outer face of the produced pot, and an upper tool that rotates around its own, separate axis, the profile of the upper tool surface corresponding to the inner surface that is formed to the pot, the manufacture being carried out by placing the blank on the form face of the lower tool and by making the tools rotate so that the blank is rotated along with the lower tool and the surface of the upper tool is in linear roll contact with the blank, whereby the metal is reshaped in the slot between the tools, spreading out into the desired form of the pot.
• Roll forming is a cold-moulding process based on malleability of metal, in which the forming tool that rolls on the blank forms and spreads the metal in a way that could be compared with dough kneading. Consequently, roll forming is characterised in that the blank is expanded on the area which is formed, while its material thickness is decreased.
• An advantage, as compared with the known spinning, is that the blank can be given a form that corresponds to the form faces of the tools in a single step of operation, which makes the process faster than before; the estimated forming time in series production is less than one minute, it only requires one machine tool which indicates space-saving and, unlike turning with a lathe, no waste is produced.
• the material thickness of the pot produced by roll forming is easy to adjust in different points in the pot, resulting in material saving and reduction in the weight of the pot.
• the point of attachment of the handle is provided with a sufficient material thickness while the pan in the areas surrounding the point in question can be thinner.
• the axis of the upper tool that is in linear contact with the blank is preferably inclined relative to the lower tool, and the forming is carried out in the radial slot between the tools, whereby the edge of the blank is moved outwards during the forming.
• the blank may consist of a straight, sheet-like metal body the form of which more or less corresponds to the bottom of the vessel to be manufactured, such as a frying pan, for example, whereby the sides of the vessel are not created until during the forming with the blank spreading outwards at its edges between the tools.
• the shape of the blank is not critical with respect to the method and thus the blank does not necessarily have to be either round, of the same diameter, or even straight. In every case, the vessel will find a desired form during the forming process.
• the inner and/or outer surfaces of the manufactured vessel are patterned in connection with the roll forming by using protrusions and/or recesses in the form face of the lower tool and/or on the roll surface of the upper tool. Consequently, the desired patterns are provided directly in the roll forming process and not in separate turning or compression stages as in the present manufacturing techniques.
• Roll forming does not set any limitations on the patterning of the outer surface of the vessel because the blank remains in place on the form face of the lower tool during the forming, completely conforming to its shapes.
• Annular protrusions and recesses can be formed on the inner surface of the vessel without restrictions by using corresponding figures on the surface of the upper tool.
• the synchronisation of the movements of the tool roll surface and the blank surface on the lower tool must be ensured by dividing the surfaces in suitable sectors, for example, so that the corresponding patterns of the surfaces meet repeatedly during the forming process.
• the conical roll surface of the suitably inclined upper tool can consist of, for example, five sectors with identical patterns which mould the six corresponding sectors that constitute the round surface of the blank and which can be patterned in accordance with the patterns on the upper tool surface.
• Other synchronisation between the blank and the upper tool roll surface, and the tilt angles of the upper tool axis required by them are equally viable and obvious to those skilled in the art.
• the suggested design of the inner surface of the vessel is particularly viable when grease pockets are formed on the bottom of the frying pan.
• the lower tool can be rotated by a motor, whereby the blank that is being formed remains in place on the form face of the lower tool under the influence of friction, and the upper tool that is provided with bearings that allow free rotation and which carries out the roll forming, can be made to rotate along with the blank and the lower tool by the influence of friction.
• the equipment according to the invention for the manufacture of a heated cooking vessel by the above-described roll forming techniques is characterised in comprising a lower tool that rotates around its own axis, the form face of the lower tool having been shaped to correspond to the outer surface of the vessel to be manufactured; and an upper tool rotated around its axis and inclined with respect to the lower tool, the surface of the upper tool having a profile that corresponds to the inner surface of the manufactured vessel, and the tools can be placed against one another so that a vessel is formed from the metal blank in the radial slot between the lower tool and the upper tool that rolls with respect to the lower tool.
• An embodiment of the equipment well-suited for the manufacture of frying pans in particular is characterised in that the form face of the lower tool comprises a horizontal centre that corresponds to the bottom of the manufactured pan, and a rising edging that corresponds to the outer side of the manufactured pan, and that the roll surface of the upper tool consists of two parallel, conical surfaces which form the inner bottom and the sides of the pan.
• the equipment according to the invention may preferably consist of replaceable modules, whereby the equipment can be used to manufacture different size and shape frying pans and other similar cooking vessels by replacing some parts.
• Fig. 1 presents the lower and upper tools of the roll forming equipment and the metal blank placed on the form face of the lower tool
• Fig. 2 presents roll forming in which the blank is being spread outwards in the slot between the tools
• Fig. 3 presents the end result of the forming phase in which the blank has been formed into the form of a frying pan
• Fig. 4 is a top view of a finished frying pan provided with a handle, the bottom of which is provided with nodular protrusions provided by the roll forming, and
• Fig. 5 presents the roll forming equipment according to another embodiment in the starting phase of the forming process.
• Figs. 1 to 3 present different stages of the manufacture of frying pan by roll forming from an essentially round, sheet-like metal blank 1 which can be of, for example, aluminium or stainless steel.
• the roll forming equipment consists of lower tool 3 that rotates around its axis 2 and of upper tool 5 that rotates around its axis 4.
• Axis 4 of upper tool 5 is inclined in angle A relative to axis 2 of lower tool 3 (Fig. 3).
• Lower tool 3 comprises a form face the shape of which corresponds to the outer surface of the manufactured frying pan, comprising horizontal centre 6 that corresponds to the bottom of the pan, and a rising edge 7 that corresponds to the outer sides of the pan. Said centre 6 of the form face is part of ejector pin 8 that moves in the direction of axis 2 included in lower tool 3, the ejector pin being used to remove the completed pan from the equipment to conclude the forming.
• Upper tool 5 comprises a roll surface that forms blank 1 into a pan, the roll surface consisting of two parallel conical surfaces 9, 10 which together provide a profile that corresponds to the inner bottom 14 and sides 17 of the pan (cf. Fig. 4).
• lower tool 3 Upon placing blank 1 on form face 6 at the beginning of the forming process, lower tool 3 is made to rotate around its axis 2 by using a motor (not shown), whereby the blank rotates along with the lower tool under the influence of friction. Thereafter, upper tool 5, provided with a bearing that allows free rotation, is lowered against the surface of blank 1, whereby the movement of the blank makes it rotate around its axis 4 so that the upper tool rolls on the blank in radial linear contact with its surface. Consequently, the roll forming begins to form blank 1, as though in dough kneading, reshaping it in a malleable manner, resulting in the blank beginning to spread radially outwards in slot 11 between the tools (Fig. 2).
• the above-described roll forming process enables the outer and inner surfaces of the manufactured frying pan 12 to be provided with patterns or marks consisting of protrusions and/or recesses, in connection with the roll forming.
• the patterning of the outer surface of the pan is carried out with the aid of protrusions and recesses corresponding to the patterns made on form face 6, 7 of lower tool 3.
• Blank 1 that is stationary with respect to the form face conforms perfectly to the figures of the form face in the roll forming. It is possible to pattern the inner surface of the pan, correspondingly, with the aid of protrusions and recesses made on conical surfaces 9, 10 of upper tool 5.
• Fig. 5 presents an alternative embodiment of the invention in which, unlike the one presented in Figs. 1-3, arm 2 of ejector pin 8, which constitutes the rotation axis of lower tool 3, is provided with spring 18 that is loaded against upper tool 5 during the forming process.
• the starting point of the process is that ejector pin 8 is slightly above form face 7 of lower tool 3, pushed by spring 18, and blank 1 from which the frying pans is formed is placed on the ejector pin.
• Upper tool 5 that is inclined with respect to lower tool 3, comprising roll surface 9 that corresponds to form face 7 of the lower tool is then pressed against blank 1 to the position according to Fig. 5, and further downwards against spring 18 so that ejector pin 8 is pressed to corresponding recess 19 in lower tool 3.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Frying-Pans Or Fryers (AREA)
• Cookers (AREA)
• Shaping Metal By Deep-Drawing, Or The Like (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=8543273

Family Applications (1)

Country Status (13)

Families Citing this family (5)

Family Cites Families (6)

• 1995
  • 1995-04-20 FI FI951882A patent/FI100580B/fi active IP Right Grant
• 1996
  • 1996-04-19 EE EE9700243A patent/EE9700243A/xx unknown
  • 1996-04-19 EP EP96910981A patent/EP0821626A1/en not_active Withdrawn
  • 1996-04-19 HU HU9802948A patent/HUP9802948A3/hu unknown
  • 1996-04-19 CA CA002221583A patent/CA2221583A1/en not_active Abandoned
  • 1996-04-19 AU AU54006/96A patent/AU5400696A/en not_active Abandoned
  • 1996-04-19 JP JP8531293A patent/JPH11503973A/ja active Pending
  • 1996-04-19 CN CN96193375A patent/CN1185125A/zh active Pending
  • 1996-04-19 WO PCT/FI1996/000213 patent/WO1996033030A1/en not_active Application Discontinuation
  • 1996-04-19 KR KR1019970707408A patent/KR19990007885A/ko not_active Application Discontinuation
  • 1996-04-19 PL PL96322829A patent/PL322829A1/xx unknown
  • 1996-04-19 CZ CZ973295A patent/CZ329597A3/cs unknown
• 1997
  • 1997-10-17 NO NO974818A patent/NO974818L/no not_active Application Discontinuation

Non-Patent Citations (1)

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