EP3583302B1 - Verfahren zur herstellung von hohlraumventilen - Google Patents

Verfahren zur herstellung von hohlraumventilen Download PDF

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Publication number
EP3583302B1
EP3583302B1 EP18710811.3A EP18710811A EP3583302B1 EP 3583302 B1 EP3583302 B1 EP 3583302B1 EP 18710811 A EP18710811 A EP 18710811A EP 3583302 B1 EP3583302 B1 EP 3583302B1
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EP
European Patent Office
Prior art keywords
annular wall
finished product
valve
mandrel
bowl
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.)
Active
Application number
EP18710811.3A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3583302A1 (de
Inventor
Thorsten MATTHIAS
Antonius Wolking
Guido Bayard
Andreas Heinek
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.)
Federal Mogul Valvetrain GmbH
Original Assignee
Federal Mogul Valvetrain GmbH
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Publication date
Application filed by Federal Mogul Valvetrain GmbH filed Critical Federal Mogul Valvetrain GmbH
Priority to PL18710811T priority Critical patent/PL3583302T3/pl
Publication of EP3583302A1 publication Critical patent/EP3583302A1/de
Application granted granted Critical
Publication of EP3583302B1 publication Critical patent/EP3583302B1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/12—Cooling of valves
    • F01L3/14—Cooling of valves by means of a liquid or solid coolant, e.g. sodium, in a closed chamber in a valve
    • 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
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/20—Making uncoated products by backward extrusion
    • B21C23/205—Making products of generally elongated shape
    • 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
    • B21K1/20—Making machine elements valve parts
    • B21K1/22—Making machine elements valve parts poppet valves, e.g. for internal-combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2303/00—Manufacturing of components used in valve arrangements

Definitions

  • the present invention relates to a method of manufacturing cavity valves for internal combustion engines.
  • inlet and outlet valves are components that are subject to high thermal and mechanical loads. Sufficient cooling is therefore necessary to ensure the long-term functionality of the valves.
  • cavity valves are advantageous over full stem valves and hollow stem valves, since there is a cavity both in the stem and in the valve head, whereby improved internal cooling - by means of a cooling medium, for example sodium - can be achieved. Further advantages are a lower weight, the avoidance of hot spots and a reduction in CO 2.
  • Cavity valves are typically manufactured using a combination of processes such as forging, turning, and welding. Turning or milling the cavity is particularly costly. Welding points on the plate surface or other critical points for operational reasons should also be avoided. Another disadvantage of known methods is that a large number of process steps are often necessary.
  • US 6006713 A a cavity valve made by closing a hollow blank by welding
  • EP2690262A1 discloses a method of making a valve body of a cavity valve.
  • the object of the present invention is therefore to provide a manufacturing method for cavity valves or a valve body for cavity valves which does not have the disadvantages mentioned and at the same time has high and good productivity Having material utilization.
  • the object is achieved by a method for producing a valve body of a hollow valve, comprising the steps of providing a cup-shaped semifinished product, the semifinished product having an annular wall which surrounds a cylindrical cavity of the semifinished product and a bottom section; Forming a valve head from the bottom portion; Lengthening the annular wall in an axial direction by forming, a mandrel being inserted into the cavity during the forming; Reducing an outer diameter of the annular wall by rotary swaging to obtain a valve stem of the finished valve body having a predetermined outer diameter; several mandrels of different diameters are used in the length of the annular wall.
  • the provision of the cup-shaped semi-finished product can comprise providing an at least partially cylindrical blank and shaping the cup-shaped semi-finished product from the blank.
  • the shaping of the cup-shaped semi-finished product can take place by a hot forming process, in particular by cup backward extrusion or forging.
  • valve head can be formed by a hot forming process, in particular by backward cup extrusion or forging.
  • the annular wall can be lengthened by rotary swaging with a mandrel or ironing slide drawing over a mandrel.
  • the reduction of the outer diameter of the annular wall can comprise several rotary swaging substeps.
  • the reduction of the outer diameter of the annular wall can take place without an inserted mandrel.
  • the method can further include filling a cooling medium, in particular sodium, into the cavity and closing the valve stem.
  • a cooling medium in particular sodium
  • Figures 1A-1F various intermediate steps of the production according to the invention of a valve body of a cavity valve (shown in FIG Figure 1F ) from a blank (shown in Figure 1A ) demonstrate.
  • FIG. 1A various intermediate stages of the production method according to the invention are shown in sectional views.
  • a blank 2 made of a valve steel known to the person skilled in the art.
  • the blank has an at least partially cylindrical shape, preferably a circular cylindrical shape, corresponding to the circular shape of the valve body or valve to be produced.
  • the blank 2 is converted into an in Figure 1B Shaped cup-shaped semi-finished product 4 or workpiece shown.
  • the semi-finished product in the form of a cup comprises a base section 10, from which a valve head (or valve disk) 12 will later be formed, and an annular wall 6 which surrounds a cylindrical, preferably circular-cylindrical, cavity 8 of the cup-shaped semi-finished product 4 and from which a valve stem 14 is later formed.
  • material can possibly flow between the bottom section 10 and the annular wall 6 during the subsequent forming steps.
  • the cup-shaped semi-finished product 4 is provided directly; the process then starts with the provision of the in Figure 1B depicted cup-shaped semi-finished product 4.
  • valve head 12 is formed from the base section 10.
  • the workpiece thus obtained is in Figure 1C shown.
  • Both the shaping of the blank 2 into a cup-shaped workpiece 4 and the shaping of the valve head 12 from the base section 10 are preferably carried out by a hot-shaping process; more preferably, backward cup extrusion or forging is used. During backward cup extrusion, a punch is pressed into the blank 2 in order to form the cavity 8.
  • an axial length of the annular wall 6 is increased.
  • “Axial” here refers to the longitudinal direction defined by the shaft, that is to say to the axis of the annular wall; “Radial” is correspondingly a direction orthogonal to the axial direction.
  • a mandrel (not shown) is inserted into the cavity during this step, so that the material is prevented from flowing in the radial direction and the material flow takes place primarily in the axial direction.
  • the inner diameter and wall thickness of the annular wall 6 can thereby be set to a desired value.
  • This reshaping step can also consist of several sub-steps, in which, if necessary, several mandrels are used with diameters decreasing one after the other.
  • the semi-finished product forms achieved with this are exemplified in Figures 1D and 1E shown, where a mandrel with a larger diameter is first used to cut the in Figure 1D to obtain the semi-finished product shown and subsequently a mandrel with a smaller diameter is used to the in Figure 1E to maintain the condition shown. It goes without saying that the use of more than two mandrels with different diameters is also possible.
  • the preferred forming process for this length or this elongation is rotary swaging with a mandrel or ironing slide drawing over a mandrel.
  • the outer diameter of the annular wall 6 is reduced by rotary swaging in order to obtain a finished valve body 16, the valve stem 12 of which has a predetermined outer diameter D, that is to say has a desired target diameter; see. Figure 1F .
  • This forming step is preferably carried out without a mandrel inserted, so that the diameter can be effectively reduced.
  • this step also leads to a further elongation of the annular wall 6 and, without a mandrel, to an increase in the wall thickness of the annular wall.
  • the wall thickness would therefore possibly have to be set somewhat smaller in the preceding lengthening step in order to obtain a specific wall thickness, and thus a specific inside diameter for a given outside diameter D, taking into account the increase in thickness in the final step.
  • the step of reducing the outer diameter of the annular wall 6 can be divided into several successive sub-steps, each of which is carried out by means of rotary swaging. This depends, among other things, on the diameter reduction to be achieved, i.e. on the difference between the initial outer diameter of the cup-shaped workpiece ( Figure 1E ) and the predetermined outer diameter D of the finished valve stem 12 to be achieved ( Figure 1F ).
  • the individual sub-steps can be carried out independently of one another by rotary swaging with or without a mandrel. If a large reduction in diameter is necessary and thus "many" sub-steps, a mandrel can be used, for example, in at least some of the sub-steps in order not to let the thickness of the annular wall 6 become too great.
  • Rotary swaging is the final forming step.
  • Rotary swaging is about an incremental pressure forming process in which the workpiece to be machined is hammered in rapid succession from different sides in the radial direction. Due to the resulting pressure, the material 'flows', so to speak, and the material structure is not distorted by tensile stresses.
  • Rotary swaging is preferably carried out as a cold forming process, ie below the recrystallization temperature of the processed material.
  • the main advantage of using rotary swaging as the final forming step is that compressive stresses are induced by the radial introduction of force during rotary swaging, which prevents the occurrence of tensile stresses that increase the susceptibility to cracks, in particular this applies to the outer layers of the hollow shaft. Such undesirable tensile stresses occur, for example, when drawing processes or "necking" are used.
  • Rotary swaging enables, among other things, an uninterrupted fiber flow in the workpiece. Further advantages of rotary swaging as the final forming step - compared to the drawing process or "necking" - are given by a better surface quality that can be achieved and by a relatively higher diameter reduction of the shaft per step.
  • a cooling medium e.g. sodium
  • a cooling medium e.g. sodium
  • a valve stem end piece which, for example, by means of friction welding or a other welding method, is attached (not shown in the figures).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Forging (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
EP18710811.3A 2017-06-29 2018-03-06 Verfahren zur herstellung von hohlraumventilen Active EP3583302B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL18710811T PL3583302T3 (pl) 2017-06-29 2018-03-06 Sposób wytwarzania zaworów z pustą przestrzenią

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017114524.9A DE102017114524A1 (de) 2017-06-29 2017-06-29 Verfahren zur Herstellung von Hohlraumventilen
PCT/EP2018/055424 WO2019001781A1 (de) 2017-06-29 2018-03-06 Verfahren zur herstellung von hohlraumventilen

Publications (2)

Publication Number Publication Date
EP3583302A1 EP3583302A1 (de) 2019-12-25
EP3583302B1 true EP3583302B1 (de) 2021-04-14

Family

ID=61627077

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18710811.3A Active EP3583302B1 (de) 2017-06-29 2018-03-06 Verfahren zur herstellung von hohlraumventilen

Country Status (8)

Country Link
US (1) US11260448B2 (pl)
EP (1) EP3583302B1 (pl)
JP (1) JP7051904B2 (pl)
KR (1) KR102446127B1 (pl)
CN (1) CN110869590B (pl)
DE (1) DE102017114524A1 (pl)
PL (1) PL3583302T3 (pl)
WO (1) WO2019001781A1 (pl)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020100185A1 (ja) * 2018-11-12 2020-05-22 日鍛バルブ株式会社 エンジンのポペットバルブの製造方法
DE102019106222A1 (de) * 2019-03-12 2020-09-17 Federal-Mogul Valvetrain Gmbh Verfahren zur Herstellung eines Hohlventils für Verbrennungsmotoren
DE102019106214A1 (de) 2019-03-12 2020-09-17 Federal-Mogul Valvetrain Gmbh Verfahren zur Herstellung eines Hohlventils für Verbrennungsmotoren
DE102019106209A1 (de) * 2019-03-12 2020-09-17 Federal-Mogul Valvetrain Gmbh Verfahren zur Herstellung eines Hohlventils für Verbrennungsmotoren
WO2021199190A1 (ja) 2020-03-30 2021-10-07 日鍛バルブ株式会社 エンジンのポペットバルブの製造方法
CN112719201B (zh) * 2020-12-02 2022-09-23 浙江欧伦泰防火设备有限公司 一种阀门锻压工艺
WO2022195730A1 (ja) * 2021-03-16 2022-09-22 フジオーゼックス株式会社 中空エンジンバルブ及びその製造方法

Family Cites Families (12)

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Publication number Priority date Publication date Assignee Title
US2009996A (en) * 1931-10-20 1935-08-06 Jr Louis W Gering Method of making valves
US5413073A (en) * 1993-04-01 1995-05-09 Eaton Corporation Ultra light engine valve
US5458314A (en) * 1993-04-01 1995-10-17 Eaton Corporation Temperature control in an ultra light engine valve
DE59707222D1 (de) 1997-08-19 2002-06-13 Trw Deutschland Gmbh Hohlventil für Verbrennungsmotoren
DE20122516U1 (de) * 2001-04-11 2005-12-29 Gkn Driveline International Gmbh Vorrichtung zum Abstrecken von zylindrischen Hohlkörpern (Rohrziehen)
JP4390291B1 (ja) * 2008-09-18 2009-12-24 株式会社 吉村カンパニー 中空エンジンバルブの弁傘部の製造方法及び中空エンジンバルブ
US8230597B2 (en) * 2008-10-03 2012-07-31 Ford Global Technologies, Llc Forming preforms and parts therefrom
JP4929408B1 (ja) * 2011-03-22 2012-05-09 三菱重工業株式会社 中空エンジンバルブの製造方法
JP5950440B2 (ja) 2012-01-30 2016-07-13 三菱重工工作機械株式会社 中空エンジンバルブの製造方法
JP2014084725A (ja) 2012-10-19 2014-05-12 Mitsubishi Heavy Ind Ltd エンジンバルブ及びその製造方法
JP5625220B2 (ja) 2013-01-15 2014-11-19 株式会社飯塚製作所 鍛造方法及び鍛造装置
DE102017114509A1 (de) * 2017-06-29 2019-01-03 Federal-Mogul Valvetrain Gmbh Hohlraumventil mit optimierter Schaftinnengeometrie und Verfahren zu dessen Herstellung

Non-Patent Citations (1)

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None *

Also Published As

Publication number Publication date
KR20200019904A (ko) 2020-02-25
US20200156144A1 (en) 2020-05-21
JP7051904B2 (ja) 2022-04-11
EP3583302A1 (de) 2019-12-25
DE102017114524A1 (de) 2019-01-03
US11260448B2 (en) 2022-03-01
KR102446127B1 (ko) 2022-09-21
CN110869590B (zh) 2021-08-03
WO2019001781A1 (de) 2019-01-03
PL3583302T3 (pl) 2021-11-15
JP2020525695A (ja) 2020-08-27
CN110869590A (zh) 2020-03-06

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