WO1986003437A1 - Dispositif de presse pour la fabrication d'une cremaillere de direction - Google Patents

Dispositif de presse pour la fabrication d'une cremaillere de direction Download PDF

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Publication number
WO1986003437A1
WO1986003437A1 PCT/EP1985/000662 EP8500662W WO8603437A1 WO 1986003437 A1 WO1986003437 A1 WO 1986003437A1 EP 8500662 W EP8500662 W EP 8500662W WO 8603437 A1 WO8603437 A1 WO 8603437A1
Authority
WO
WIPO (PCT)
Prior art keywords
gap
press device
rack
die
negative
Prior art date
Application number
PCT/EP1985/000662
Other languages
German (de)
English (en)
Inventor
Ansgar Betz
Original Assignee
Zahnradfabrik Friedrichshafen 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 Zahnradfabrik Friedrichshafen Ag filed Critical Zahnradfabrik Friedrichshafen Ag
Publication of WO1986003437A1 publication Critical patent/WO1986003437A1/fr

Links

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
    • B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
    • B21K1/767—Toothed racks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D3/00—Steering gears
    • B62D3/02—Steering gears mechanical
    • B62D3/12—Steering gears mechanical of rack-and-pinion type
    • B62D3/123—Steering gears mechanical of rack-and-pinion type characterised by pressure yokes

Definitions

  • the invention relates to a pressing device for producing a rack according to the kind described in the preamble of claim 1.
  • DE-AS 21 41 205 describes a steering gear for vehicles, in which a toothed rack is explained, the teeth of which have a different profile shape in the central region than in the outer parts. In this way, a variable translation is achieved.
  • Steering gear with such racks can e.g. can be used advantageously for passenger cars.
  • the reduction changes relatively quickly from the center of the rack to both sides until an approximately constant reduction ratio is reached.
  • the rack works together with a pinion, which is provided with helical teeth and whose axis encloses an angle other than 90 ° with the rack axis. In the middle area of the rack, the flank lines of the teeth form an angle with the pinion axis, which angle is changed compared to the angle in the outer parts of the rack. With such a configuration, reduction ratios of 2: 1 can be achieved without difficulty.
  • DE-OS 32 02 254 already describes a method and a device for producing a toothed rack, which is produced by a pressing process.
  • a blank is treated in a press with an upper die and a lower die by cold forming, a die part performing a wobble movement over the blank during the pressing process.
  • the manufacturing time is shorter and the material requirement is lower. Furthermore, an increase in material strength and smooth surfaces are achieved.
  • this gap has the disadvantage that it is possible to drain excess material in a relatively simple manner. This means that the gap will fill with material very quickly during the wobble press. The resulting material bar thus offers a corresponding resistance to the further pressing process. A high degree of compression occurs in the two strips and there is a risk that a further collapse ken of the two die parts is no longer possible. This means that cavities can remain in the negative form, in particular in the area of the tooth tips, or that the tooth tips are not compressed sufficiently and are therefore not resistant enough and are not geometrically perfect.
  • the present invention is therefore based on the object of creating a pressing device of the type mentioned at the beginning, in which a material drain is possible to a sufficient extent, but which does not adversely affect the production of the toothed rack.
  • the two surfaces of the die parts facing each other are no longer flat or even, but at least partially widen outwards.
  • the tumbling die part generally the upper die, can be kneaded into the material that has flowed out at the beginning of the pressing process.
  • the gap can become ever narrower and less permeable, so that the pressing process can be carried out without interference from the emerging material.
  • the toothed rack can be produced from a blank, if necessary without pre-pressing, in one operation.
  • the gap can widen outwards from the edges of the negative mold, ie the surfaces of the two die parts facing each other run directly at the edges of the negative molds without a transition 8 5 /
  • the gap can widen continuously or in steps. Due to the wobbling movement, small steps can occur in the gap.
  • the gap can be widened, i.e. the edge along the die shape is formed like a hammer fin.
  • the half wedge angle is greater than the wobble angle of the swivel part that performs a wobble movement.
  • the wedge angle will be significantly larger than the wobble angle.
  • a sufficiently large wedge opening then arises in which the material which has flowed out through the constriction at the edge of the die no longer has any contact with the upper or lower part of the die. The pressing process can no longer be significantly hindered by the material that has flowed out.
  • the gap width at the narrowest point at the end of the pressing process can be between 0.2 to 5 mm, preferably 0.4 to 1 mm.
  • Other values are also possible within the scope of the invention. This depends on the individual circumstances, e.g. Size and material of the rack.
  • Fig. 1 the two die parts of a pressing device with the 'rack in cross section according to the prior art.
  • Fig. 2 the two die parts according to the invention with a rack in cross section.
  • press device Of the press device, only the two die parts, namely an upper die part 1 and a lower die part 2, are shown, since the press device itself is of a conventional design and thus its structure and mode of operation are generally known.
  • the upper part of the die is provided with a negative shape for the tooth profile and the lower part 2 is provided with a negative shape for the lower part of the toothed rack 3 to be produced from a blank.
  • the blank can be a round rod, for example.
  • the finished toothed rack 3 has - seen in cross section - essentially a Y-profile.
  • the rack 3 is provided with a flat in the of symmetry extending approximately over the extending to interlocking portion in the longitudinal direction of the web "4. From the web 4 from run two Schrägfl surfaces 5 and 6, rod side to the toothed.
  • the two inclined surfaces 5 and 6 represent the contact surfaces for a pressure piece after installation in a steering gear.
  • the upper die part 1 is generally fastened in a bell, not shown, which is pivotably mounted in a bearing the bell and thus also the upper part of the die are made to tumble in relation to the stationary lower part 2.
  • the forming force is thus concentrated only on a partial surface of the workpiece, the pressure zone being displaced over the entire surface of the workpiece and thus causing the forming.
  • 1 shows an upper die part 1 and a lower die part 2 according to the prior art.
  • the two mutually facing surfaces 10 and 11 of the upper die part 1 and the lower die part 2 are flat or lie parallel to one another.
  • the strips 8 thus represent considerable resistance to deformation and the two die parts may not come close enough under certain circumstances. This means that 4 cavities 12 can remain in the area of the tooth heads of the toothed rack.
  • the pressing device according to the invention can be seen from FIG. As indicated, the mutually facing surfaces 10 and 11 of the upper die part 1 and of the lower die part Z are not parallel to one another, but rather strive apart. This results in a wedge-shaped gap 13.
  • the gap width at the narrowest point can be between 0.2 and 5 mm, preferably between 0.4 and 1 mm.
  • the gap 13 widens continuously towards the outside.
  • Half the wedge angle A is significantly larger than the wobble angle of the upper die part 1.
  • the toothed rack 4 is formed in the upper region, in particular in the region of the teeth 3, on both sides upwards to be slightly inclined, which is shown in FIG. 2 . is represented by the angle B. In this way, compression also takes place from the side during the tumbling process.
  • the negative shape of the toothed rack in the upper part 1 of the die not only serves essentially as before to form the tooth profile shapes, but also absorbs more of the toothed rack. This is indicated in FIG. 2 by the dashed line 9. This measure makes production from a round rod easier, since it is better encompassed by the upper die part 1.
  • the additional molding depth can be a few millimeters.
  • the two die parts 1 and 2 have sharp edges there, the edge of the upper die part 1 even being able to overlap the edge of the lower die part somewhat. In this way, the bar 8 can be secured immediately at the end of the pressing process.
  • the upper die part 1 has a leading edge 14 (shown in dashed lines) against which the emerging material runs and is bent downwards there during the further pressing process, as a result of which the strip 8 also breaks off .
  • the leading edge can also be arranged on the lower part of the die for breaking off the strip 8. In this case it is bent upwards.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Forging (AREA)

Abstract

Un dispositif de presse pour la fabrication d'une crémaillère de direction (4), surtout une crémaillère à rapports variables obtenus grâce à des profils de dentures diffèrents, est composé d'un élément de forgeage supérieur (1) et d'un élément de forgage inférieur (2). Un élément de forgeage (2) constitue la matrice négative pour la partie inférieure de la crémaillère de direction obtenue à partir d'une ébauche; l'autre élément de forgeage (1) sert à former le profil de la denture de la crémaillère dans la matrice négative. On réalise la crémaillère par emboutissage à froid; pour cela un élément de forgeage (1) effectue un mouvement de mutation sur l'ébauche pendant l'emboutissage. Un écartement (13) est crée entre les deux éléments de forgeage (1, 2) pour permettre l'écoulement latéral de la matière pendant l'emboutissage, ledit écartement étant au moins partiellement rempli par des bandes (8) produites sur les deux côtés longitudinaux de la crémaillère ainsi réalisée (4). Les surfaces opposées (10, 11) des deux éléments de forgeage (1, 2) situées latéralement par rapport aux formes négatives de la crémaillère (4) à proximité de l'écartement (13) sont conçues de sorte que l'écartement s'élargit au moins partiellement vers l'extérieur.
PCT/EP1985/000662 1984-12-13 1985-12-03 Dispositif de presse pour la fabrication d'une cremaillere de direction WO1986003437A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LUPCT/EP84/00397 1984-12-13
EP8400397 1984-12-13

Publications (1)

Publication Number Publication Date
WO1986003437A1 true WO1986003437A1 (fr) 1986-06-19

Family

ID=8164994

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1985/000662 WO1986003437A1 (fr) 1984-12-13 1985-12-03 Dispositif de presse pour la fabrication d'une cremaillere de direction

Country Status (2)

Country Link
DE (1) DE3542672A1 (fr)
WO (1) WO1986003437A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10203888A1 (de) * 2002-01-31 2003-08-21 Zf Lenksysteme Gmbh Verfahren und Vorrichtung zum Herstellen einer Zahnstange
DE102006040172A1 (de) * 2006-08-26 2008-02-28 Zf Lenksysteme Gmbh Vorrichtung zum Herstellen einer Zahnstange für eine Zahnstangenlenkung in Kraftfahrzeugen
CN102699091A (zh) * 2012-05-21 2012-10-03 中北大学 一种挤压铝合金壳体零件的无飞边模具

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AUPN729495A0 (en) * 1995-12-21 1996-01-18 A.E. Bishop & Associates Pty Limited Method and apparatus for manufacturing steering rack bar
DE19726697A1 (de) * 1997-06-24 1999-01-07 Zahnradfabrik Friedrichshafen Verfahren zum Herstellen einer Zahnstange
JP2004034829A (ja) * 2002-07-03 2004-02-05 Nsk Ltd ステアリング装置及びラック軸の製造方法
DE102008054687A1 (de) 2008-12-16 2010-06-17 Zf Lenksysteme Gmbh Verfahren zur Herstellung einer Zahnstange für ein Lenkgetriebe
CN105772623A (zh) * 2015-11-27 2016-07-20 昆山惠众机电有限公司 一种t型零件的精密锻造工艺
CN106216577A (zh) * 2016-07-19 2016-12-14 苏州誉衡昌精密机械有限公司 一种长杆类零件的锻造工艺

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2991552A (en) * 1957-08-14 1961-07-11 Henry B Chatfield Cold forging process
US3494161A (en) * 1968-01-11 1970-02-10 Alexandr Nikolaevich Silichev Device for stamping metal blanks
DE2515948A1 (de) * 1974-05-08 1976-04-01 Tesla Np Formwerkzeug
DE2703763A1 (de) * 1977-01-29 1978-08-03 Alfred Dipl Ing Ebbinghaus Vorrichtung zur herstellung eines metallischen werkstueckes
DE3202254A1 (de) * 1982-01-25 1983-07-28 Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen Verfahren und vorrichtung zur herstellung einer zahnstange

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2991552A (en) * 1957-08-14 1961-07-11 Henry B Chatfield Cold forging process
US3494161A (en) * 1968-01-11 1970-02-10 Alexandr Nikolaevich Silichev Device for stamping metal blanks
DE2515948A1 (de) * 1974-05-08 1976-04-01 Tesla Np Formwerkzeug
DE2703763A1 (de) * 1977-01-29 1978-08-03 Alfred Dipl Ing Ebbinghaus Vorrichtung zur herstellung eines metallischen werkstueckes
DE3202254A1 (de) * 1982-01-25 1983-07-28 Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen Verfahren und vorrichtung zur herstellung einer zahnstange

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10203888A1 (de) * 2002-01-31 2003-08-21 Zf Lenksysteme Gmbh Verfahren und Vorrichtung zum Herstellen einer Zahnstange
DE102006040172A1 (de) * 2006-08-26 2008-02-28 Zf Lenksysteme Gmbh Vorrichtung zum Herstellen einer Zahnstange für eine Zahnstangenlenkung in Kraftfahrzeugen
CN102699091A (zh) * 2012-05-21 2012-10-03 中北大学 一种挤压铝合金壳体零件的无飞边模具

Also Published As

Publication number Publication date
DE3542672A1 (de) 1986-06-19

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