EP1094908A1 - Verfahren zur herstellung einer nockenwelle aus stahl und nach diesem verfahren hergestellte nockenwelle - Google Patents
Verfahren zur herstellung einer nockenwelle aus stahl und nach diesem verfahren hergestellte nockenwelleInfo
- Publication number
- EP1094908A1 EP1094908A1 EP99947245A EP99947245A EP1094908A1 EP 1094908 A1 EP1094908 A1 EP 1094908A1 EP 99947245 A EP99947245 A EP 99947245A EP 99947245 A EP99947245 A EP 99947245A EP 1094908 A1 EP1094908 A1 EP 1094908A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- camshaft
- steel
- casting
- pouring
- molds
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
- B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
- B22C7/023—Patterns made from expanded plastic materials
- B22C7/026—Patterns made from expanded plastic materials by assembling preformed parts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F7/00—Casings, e.g. crankcases or frames
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F2200/00—Manufacturing
- F02F2200/06—Casting
- F02F2200/08—Casting using a lost model, e.g. foam casting
Definitions
- the invention relates to a method for producing a one-piece, profiled hollow camshaft made of steel.
- Profiled means that the camshaft is tubular with a profiled inner surface that corresponds to the contours of the cams and the bearing areas on the camshaft in a certain sense.
- Steel camshafts are known, for example, from JP 02 102 302 A.
- camshafts are suitable and intended for valve drives of internal combustion engines in which the valve is actuated in particular via a roller contact to the camshaft.
- camshafts are required that can withstand Hertzian surface pressures of up to 2,500 MPa throughout the engine life without damaging the tread.
- the design as a hollow camshaft has the advantage, on the one hand, of saving weight and, on the other hand, of being able to lubricate through the camshaft. From JP 61 115 660 A and JP 62 296 935 A it is known to manufacture metal cam shafts in a lost foam casting process.
- the invention is concerned with the problem of being able to produce a generic camshaft as efficiently as possible.
- a gate system according to claim 2 is of particular importance for casting production.
- the casting molds are based on the principle of the lost foam casting system. This means that the camshaft is created and used as a lost form from, for example, a polymer blank with an external small amount of material for the finishing. This blank, which dissolves when pouring the cast steel, is placed in a sand form inserted, the hollow interior also being filled with sand.
- the polymer used is one that has a special chemical composition that prevents harmful carburizing processes when pouring the molten steel. As a result, the high geometric requirements for the casting mold required when carrying out the teaching according to the invention are met.
- a special sprue system according to the subclaims is used according to the invention, by means of which it is possible to cast a large number of camshafts, for example more than 50, at the same time.
- the plug-in system shown in the subclaims is used.
- the use of adhesive can be dispensed with, which has an advantageous effect on the casting quality.
- Fig. 1 shows a sand mold box without sand with a mold consisting of a large number of individual, interconnected molds.
- the mold device shown consists of a central, vertically aligned filling channel 1 for liquid casting material to be filled into the device, which is connected at its lower end via horizontally star-shaped connecting channels 2 with pouring channels 3 for the camshaft molds 4.
- All of the above-mentioned parts consist of material that melts under the casting material, such as, for example, a polymer known from lost foam casting processes. However, it can be expedient to design the filler channel 1 from a non-melting material.
- the camshaft molds 4 are arranged axially parallel to the respective pouring channel 3, around which they are distributed, and are connected to the latter via its height via a plurality of gate connections 5.
- the individual pouring channels 3, of which a large number may be present, are each closed at their upper ends with a ceramic stopper 6 as a throttle valve.
- the parts 1, 2, 3, 4 and possibly also 5 of the casting device which melt during the execution of the casting process are each coated on their surfaces with a size-acting size.
- the material of this size also ensures sufficient permeability of the gases formed when the lost molded parts, ie the polymer parts, are dissolved. This simple ensures, in particular, a high surface quality of the camshafts produced according to the invention.
- a molding box 7 is filled with sand in such a way that all meltable molded parts are completely enclosed by sand.
- Fully enclosed in the case of the camshaft casting molds means that they are also completely filled with sand in their inner, profiled cavity.
- the sand surrounding the molded parts is merely poured into the molding box 7 as loose sand and is not pressed there in any particular way.
- the molding box 7 vibrates to achieve a good molding sand distribution.
- the individual parts of the pouring device are simply non-positively inserted into one another.
- the filling channel 1 is plugged into a composite part formed from the connecting channels 2 and the pouring channels 3 into the connecting channels 2.
- the camshaft casting molds 4 are also only plugged into the respective pouring channel 3, specifically via the gate connections 5. Even the camshaft casting shapes 4 can be built up from individual parts in the axial direction and put together.
- the sequence of filling a pouring device molded in sand inside a molding box 7 is as follows.
- Liquid casting material is introduced into the filler channel 1 and passes through the connecting channels 2 from below into the pouring channels 3. From there, the casting material penetrates through the gate connections 5 into the individual camshaft casting molds 4, the casting material being uniform in the respective pouring channel 3 and with it connected camshaft molds 4 rises.
- the ceramic plug 6 creates a certain casting pressure above atmospheric pressure when the casting material penetrates into the pouring channels 3. Under the heat of the casting material, the individual molded parts of the casting device dissolve in a manner which is customary in the lost foam casting process known per se. In order to achieve good casting quality and to ensure sufficient dimensional stability of the casting device during the casting process, the size coating on the individual molded parts is of particular importance.
- the casting material in the form of the casting device can simply be pulled out of the sand bed of the molding box 7 and completely removed from the casting sand by shaking.
- This provides an extremely efficient manufacturing process.
- more than 50 camshafts can be produced in a single system arrangement in a single casting process.
- the individual camshafts must of course still be mechanically freed from the respective sprues or sprue channels after their manufacture in the casting process described.
- this is possible in a simple, customary manner.
- a particularly favorable material for a camshaft that can be produced according to the invention has the following composition in% by weight:
- camshafts are mechanically pre-processed at the bearing points and the cam running points, solidified at the edge layer by, for example, inductive hardening, case hardening, carbonitriding or other comparable processes and then finished. Finishing is expediently carried out by grinding.
- camshafts according to the invention have a typical surface relief which is known from styrofoam parts at locations which are not machined. The cavity of the camshaft is not machined. In places of the camshaft that are not specially hardened at the surface, the surface hardness is 150 to 400 HB.
- the size of the casting defects is limited to 0.1 mm by the method according to the invention in a range of 1 mm below the cam surfaces.
- the hardness of the cam surface is between 35 and 70 HRC, depending on the surface pressure required.
- the cam surface typically has residual stresses between 50 and 600 MPa.
- the structure of the camshaft according to the invention is ferritic-pearlitic or ledeburitic. In the area of surface hardening, there are typically martensitic or bainitic structures.
- C, N or B contents increased by 0.1 to 3% can also be present in this area.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Gears, Cams (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19833594A DE19833594A1 (de) | 1998-07-25 | 1998-07-25 | Nockenwelle aus Stahlguß |
DE19833594 | 1998-07-25 | ||
PCT/DE1999/002244 WO2000006320A1 (de) | 1998-07-25 | 1999-07-21 | Verfahren zur herstellung einer nockenwelle aus stahl und nach diesem verfahren hergestellte nockenwelle |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1094908A1 true EP1094908A1 (de) | 2001-05-02 |
EP1094908B1 EP1094908B1 (de) | 2005-09-21 |
Family
ID=7875338
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99947245A Expired - Lifetime EP1094908B1 (de) | 1998-07-25 | 1999-07-21 | Verfahren zur herstellung einer nockenwelle aus stahl und nach diesem verfahren hergestellte nockenwelle |
Country Status (5)
Country | Link |
---|---|
US (1) | US6478074B1 (de) |
EP (1) | EP1094908B1 (de) |
BR (1) | BR9912441A (de) |
DE (3) | DE19833594A1 (de) |
WO (1) | WO2000006320A1 (de) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10340994A1 (de) * | 2003-09-05 | 2005-03-31 | Mahle Ventiltrieb Gmbh | Verfahren zur Herstellung eines hochlegierten Stahlgusswerkstoffes mit feiner Kornstruktur. |
KR20060040570A (ko) * | 2003-10-31 | 2006-05-10 | 닛폰 피스톤 린구 가부시키가이샤 | 캠샤프트의 제조 방법, 캠샤프트 및 이것에 이용하는캠로브재 |
DE102006015735A1 (de) * | 2006-04-04 | 2007-10-11 | Stahlschmidt & Maiworm Technics Gmbh | Verfahren zur Herstellung eines Lagerrahmens zur Lagerung einer Kurbelwelle und ein solcher Lagerrahmen |
US8136571B2 (en) * | 2009-05-19 | 2012-03-20 | Debruin Mark | Carbidic outer edge ductile iron product, and as cast surface alloying process |
DE102009025023A1 (de) | 2009-06-10 | 2010-12-16 | Neumayer Tekfor Holding Gmbh | Verfahren zur Herstellung einer Nockenwelle und entsprechende Nockenwelle |
DE102013223179A1 (de) * | 2013-11-14 | 2015-05-21 | Bayerische Motoren Werke Aktiengesellschaft | Komplexes Gussbauteil sowie Gießverfahren hierfür |
DE102014008978A1 (de) | 2014-06-17 | 2016-01-21 | Daimler Ag | Verfahren zum Herstellen eines Stahlkolbens und Stahlkolben für einen Verbrennungsmotor |
MX2016010930A (es) * | 2016-08-23 | 2017-04-03 | Arbomex S A De C V | Proceso de fabricacion de arbol de levas con componente funcional como inserto de ensamble y el arbol de levas obtenido con el mismo. |
Family Cites Families (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE120104C (de) | ||||
DE2041777A1 (de) * | 1970-08-22 | 1972-02-24 | Ferdinand Just | Verfahren zur Herstellung von Freiformguessen |
DE2424590A1 (de) * | 1974-05-21 | 1975-12-04 | Buderus Eisenwerk | Verfahren zur herstellung einer gegossenen kurbel- bzw. nockenwelle |
DD120104A3 (de) * | 1974-05-28 | 1976-06-05 | ||
FR2456785A1 (fr) * | 1979-05-17 | 1980-12-12 | Daido Steel Co Ltd | Acier de decolletage contenant des inclusions determinees et un procede de sa preparation |
DE3416132C2 (de) * | 1984-05-02 | 1986-11-06 | Bernd 7530 Pforzheim Schüssler | Vorrichtung zum Guß von insbesondere geschmolzenem Metall |
JPS61115660A (ja) | 1984-11-13 | 1986-06-03 | Nissan Motor Co Ltd | カムシャフトの製造方法 |
US4673023A (en) * | 1984-12-14 | 1987-06-16 | Outboard Marine Corporation | Multipart lost foam pattern and method of making same |
JPS61241444A (ja) * | 1985-04-19 | 1986-10-27 | Toyota Motor Corp | 一体型ベアリングキヤツプの製造方法 |
DE3532196A1 (de) * | 1985-09-10 | 1987-04-16 | Wizemann Gmbh U Co J | Nockenwelle und vorrichtung zu ihrer herstellung |
JPH062303B2 (ja) | 1986-06-16 | 1994-01-12 | 本田技研工業株式会社 | 金型による鋳物の製造方法 |
JPS63264248A (ja) * | 1987-04-22 | 1988-11-01 | Mazda Motor Corp | 中空カムシヤフトの製造方法 |
US4791977A (en) * | 1987-05-07 | 1988-12-20 | Metal Casting Technology, Inc. | Countergravity metal casting apparatus and process |
JPS6462444A (en) * | 1987-09-02 | 1989-03-08 | Kawasaki Steel Co | Press die steel |
JPH01238765A (ja) * | 1988-03-18 | 1989-09-22 | Jidosha Imono Kk | カム軸の製造方法 |
JPH02102302A (ja) | 1988-10-11 | 1990-04-13 | Honda Motor Co Ltd | カムシャフト及びその製造方法 |
JPH02137641A (ja) * | 1988-11-16 | 1990-05-25 | Tokico Ltd | 鋳造用消失模型 |
US5013611A (en) * | 1989-01-19 | 1991-05-07 | Nippon Piston Ring Co., Ltd. | Camshaft composition |
JPH04167946A (ja) * | 1990-10-30 | 1992-06-16 | Kubota Corp | フルモールド鋳造用鋳型 |
DE4100779A1 (de) * | 1991-01-12 | 1991-07-18 | Daimler Benz Ag | Verfahren zum giessen von nockenwellenrohlingen aus unterschiedlichen eisenwerkstoffen |
JPH071076A (ja) * | 1993-06-15 | 1995-01-06 | Kubota Corp | 消失模型鋳造の造型方法 |
JPH0711377A (ja) | 1993-06-24 | 1995-01-13 | Daido Steel Co Ltd | 焼結工具鋼の製造方法 |
CH686711A5 (de) * | 1993-07-20 | 1996-06-14 | Von Roll Ag | Verfahren zur Herstellung eines Bauteils aus Eisenwerkstoff. |
DE4411795A1 (de) * | 1994-04-06 | 1995-12-14 | Kugelfischer G Schaefer & Co | Nichtrostender Stahl für das Einsatzhärten mit Stickstoff |
DE4431713C2 (de) * | 1994-09-06 | 2001-03-15 | Audi Ag | Vorrichtung zum Herstellen von Gußstücken |
US5560420A (en) * | 1994-11-25 | 1996-10-01 | The United States Of America As Represented By The Secretary Of The Interior | Process for casting hard-faced, lightweight camshafts and other cylindrical products |
-
1998
- 1998-07-25 DE DE19833594A patent/DE19833594A1/de not_active Withdrawn
-
1999
- 1999-07-21 BR BR9912441-6A patent/BR9912441A/pt not_active IP Right Cessation
- 1999-07-21 US US09/744,007 patent/US6478074B1/en not_active Expired - Lifetime
- 1999-07-21 EP EP99947245A patent/EP1094908B1/de not_active Expired - Lifetime
- 1999-07-21 DE DE59912583T patent/DE59912583D1/de not_active Expired - Lifetime
- 1999-07-21 WO PCT/DE1999/002244 patent/WO2000006320A1/de active IP Right Grant
- 1999-07-21 DE DE19981402T patent/DE19981402D2/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0006320A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE19833594A1 (de) | 2000-01-27 |
US6478074B1 (en) | 2002-11-12 |
BR9912441A (pt) | 2001-04-17 |
WO2000006320A1 (de) | 2000-02-10 |
DE59912583D1 (de) | 2006-02-02 |
EP1094908B1 (de) | 2005-09-21 |
DE19981402D2 (de) | 2001-07-12 |
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