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EP0812637A1 - Matrice pour le formage à froid d'articles - Google Patents

Matrice pour le formage à froid d'articles Download PDF

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Publication number
EP0812637A1
EP0812637A1 EP97109465A EP97109465A EP0812637A1 EP 0812637 A1 EP0812637 A1 EP 0812637A1 EP 97109465 A EP97109465 A EP 97109465A EP 97109465 A EP97109465 A EP 97109465A EP 0812637 A1 EP0812637 A1 EP 0812637A1
Authority
EP
European Patent Office
Prior art keywords
core
die according
sleeve
die
socket
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.)
Withdrawn
Application number
EP97109465A
Other languages
German (de)
English (en)
Inventor
Günter c/o SWG Schraubenwerk Stiebitz
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.)
SWG Schraubenwerk Gaisbach GmbH
Original Assignee
SWG Schraubenwerk Gaisbach GmbH
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 SWG Schraubenwerk Gaisbach GmbH filed Critical SWG Schraubenwerk Gaisbach GmbH
Publication of EP0812637A1 publication Critical patent/EP0812637A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00—Details of machines for forging, pressing, or hammering
    • B21J13/02—Dies or mountings therefor
    • 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
    • B21K1/44—Making machine elements bolts, studs, or the like
    • B21K1/46—Making machine elements bolts, studs, or the like with heads
    • 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
    • B21K1/58—Making machine elements rivets

Definitions

  • the invention is based on a die for cold forming objects.
  • matrices which usually contain a core made of hard material which is adapted to the actual shape of the object to be produced and which is inserted in a holder.
  • Screwed die systems are also known, in which the inner bore of the socket has an inward shoulder at one end, against which the core or several core parts bear. From the opposite side it is then fixed by a pressure screw to be screwed in.
  • a multi-part tool for forming metallic materials which has an insert in a housing made of steel, between which and the housing a reinforcement is inserted (DD 57 492).
  • the reinforcement is formed from an internally cylindrical and externally conical elastic intermediate ring and from one or more outer rings. The intermediate ring is pressed in axially. This creates an inseparable connection so that the tool can no longer be used after it has been used.
  • the invention has for its object to provide a die system that can be used for different applications and in which the tool costs can be reduced by multiple use.
  • the invention proposes a die with the features listed in claim 1. Developments of the invention are the subject of dependent claims.
  • the core By pressing in the bushing, which takes place in the axial direction, the core can be fixed in the socket, which at the same time enables the core to be pretensioned similarly to cold or hot shrinking.
  • the invention enables the bush to be pressed out of the socket again in the axial direction using a press, so that a possibly damaged core can then be replaced. It also becomes possible to press a different core into the version for different applications.
  • the conical space which is annular in cross-section is that the inner opening of the socket is slightly conical.
  • the bushing which has to lie flat against the inner wall of the inner opening of the socket when the intermediate space is filled, is conical on its outside.
  • the core has a cylindrical outer shape, usually a circular cylindrical outer shape.
  • the sleeve also has a cylindrical or circular cylindrical inner shape. In this way, it becomes possible to use conventional cores that do not conform in shape.
  • the sleeve has a slot that preferably extends over its entire length.
  • the slot expediently runs along a straight surface line.
  • the invention makes it possible to let the core consist of a core element, or else to build it up from several core inserts arranged one behind the other in the axial direction. These core assignments can be identical, which is useful, for example, when different levels of stress occur at different points. Then you only need to replace the more worn core element. But it is also possible to use different core inserts for different shaping purposes. For example, the invention proposes to use a head piece to shape the head of the fastener. This head piece can be relatively flat. Because it is more stressed than that remaining core elements, it can then be replaced separately from the other core elements.
  • the die shown in Fig. 1, which is not shown in detail, is arranged in a press.
  • the blanks are introduced into the die and the head is formed by pressing the protruding part.
  • the die is constructed from a socket 1, which has, for example, a circular cylindrical outer shape with a notch 2.
  • the notch 2 is used to align and fix the version 1 in the press.
  • the socket contains a longitudinal bore 3, on the inner wall 4 of which a bush 5 lies over the entire surface.
  • the sleeve 5 has the same axial length as the socket 1. It is aligned in its two end regions with the end faces 6, 7 of the socket.
  • a core 8 is arranged within the inner opening of the sleeve 5, which in the example shown is made up of a total of three inserts, namely two identical core inserts 9 and a head piece 10.
  • the two identical cylindrical core inserts 9 have an inner bore 11 which, for example, corresponds to the diameter of the Screw shaft is adjusted.
  • the head piece 10 has a cylindrical opening 12 which is aligned with the inner bore 11 and which widens in an approximately funnel shape towards the upper end face 6 of the socket. This form of extension corresponds approximately to the shape of a countersunk screw.
  • All three core inserts 9, 10 have the same outer shape, namely the shape of a circular cylinder.
  • Fig. 2 shows the version 1 alone.
  • the inner bore 3 to be seen has the shape of a very pointed truncated cone, the cone angle of which is, for example, in the range of approximately 5 °.
  • the bushing 5 also has a truncated cone shape on its outside 3, the cone angle of this shape being the cone angle of the inner bore 3 of version 1 is the same. As a result, when the bushing is inserted into the inner bore 3 of the holder 1, its outer surface 13 comes to rest over the entire surface.
  • the inner bore 14 of the sleeve 5 is cylindrical, so that core elements with a cylindrical outer shape can be used.
  • FIG. 4 shows a top view of the bush 5 of FIG. 3.
  • the upper end face 15 of the sleeve 5 therefore forms a ring with a smaller diameter than the outer diameter of the lower end face 16.
  • the view in FIG. 4 shows that the sleeve 5 has a longitudinal slot 17.
  • This longitudinal slot 17 has a narrow width, since the deformation of the sleeve 5 is only slight.
  • the slot 17 extends over a rectilinear surface line of the sleeve 5.
  • FIG. 6 shows a longitudinal section through one of the core inserts 9 with its inner bore 11.
  • the outside 18 of the two core inserts 9 lies on a circular cylinder surface.
  • FIG. 6 shows, on an enlarged scale, a section through the head piece 10 at the top in FIG. 1.
  • the funnel-shaped area 19 adjoins the cylindrical part 12 of the inner opening for forming the head of a screw.
  • the version 1 is assembled as follows. First, the version 1 is placed in a holder. Then the core inserts forming the core 8, namely the head piece 10 and the two cylindrical insert parts 9, are inserted into the slotted sleeve 5, for example from below in FIG. 2. The core inserts and the slotted sleeve are then inserted into the socket 1 together. This composite is then made by a press pressed in until the socket 1, the sleeve 5 and the core inserts are flush.
  • the die In the same way in which the die was assembled, it can be disassembled again. That is, it is possible to press the sleeve 5 out of the socket 1 in the opposite direction, so that the core inserts can then be exchanged, replaced or replaced by core inserts of a different size or shape.
  • the invention provides a system in which different core inserts, adapted to the respective application, can be arranged in a socket 1 and also removed again.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Forging (AREA)
EP97109465A 1996-06-15 1997-06-11 Matrice pour le formage à froid d'articles Withdrawn EP0812637A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19624004 1996-06-15
DE1996124004 DE19624004A1 (de) 1996-06-15 1996-06-15 Matrize zum Kaltverformen von Gegenständen

Publications (1)

Publication Number Publication Date
EP0812637A1 true EP0812637A1 (fr) 1997-12-17

Family

ID=7797089

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97109465A Withdrawn EP0812637A1 (fr) 1996-06-15 1997-06-11 Matrice pour le formage à froid d'articles

Country Status (2)

Country Link
EP (1) EP0812637A1 (fr)
DE (1) DE19624004A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014111724B4 (de) 2014-08-18 2016-03-03 Kamax Holding Gmbh & Co. Kg Matrizenmodulsatz für Presswerkzeuge zum Herstellen von Schrauben
DE102020000453A1 (de) 2020-01-24 2021-07-29 Neumayer Tekfor Engineering Gmbh Verfahren zum Erzeugen eines Werkzeugs sowie Werkzeug

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3978538A (en) * 1974-11-01 1976-09-07 The National Machinery Company Method for making shouldered tubular rivets
US4114217A (en) * 1976-09-21 1978-09-19 Akamatsu Alloy Tool Co., Ltd. Die assembly
US4287749A (en) * 1979-11-15 1981-09-08 Ford Motor Company Tapered extrusion die and method of forming the same
US4417464A (en) * 1980-03-18 1983-11-29 Mitsutoyo Kiko Co., Ltd. Nib for forming tool for bolt heads or nuts
US5019114A (en) * 1988-10-14 1991-05-28 Danfoss A/S Moulding tool and method of making same

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD57492A (fr) *
DE2934963C2 (de) * 1978-09-01 1986-05-15 Sigma Koncern, Olmütz/Olomouc Vorrichtung zur Herstellung von Hohlspindeln

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3978538A (en) * 1974-11-01 1976-09-07 The National Machinery Company Method for making shouldered tubular rivets
US4114217A (en) * 1976-09-21 1978-09-19 Akamatsu Alloy Tool Co., Ltd. Die assembly
US4287749A (en) * 1979-11-15 1981-09-08 Ford Motor Company Tapered extrusion die and method of forming the same
US4417464A (en) * 1980-03-18 1983-11-29 Mitsutoyo Kiko Co., Ltd. Nib for forming tool for bolt heads or nuts
US5019114A (en) * 1988-10-14 1991-05-28 Danfoss A/S Moulding tool and method of making same

Also Published As

Publication number Publication date
DE19624004A1 (de) 1997-12-18

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