EP2591223A2 - Verfahren zur herstellung eines zylinders für einen zweitaktmotor sowie gusskern hierfür - Google Patents
Verfahren zur herstellung eines zylinders für einen zweitaktmotor sowie gusskern hierfürInfo
- Publication number
- EP2591223A2 EP2591223A2 EP11808135.5A EP11808135A EP2591223A2 EP 2591223 A2 EP2591223 A2 EP 2591223A2 EP 11808135 A EP11808135 A EP 11808135A EP 2591223 A2 EP2591223 A2 EP 2591223A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- core
- cylinder
- salt
- casting
- slide
- 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
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/0009—Cylinders, pistons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/103—Multipart cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/105—Salt cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/108—Installation of cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
- B22D15/02—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor of cylinders, pistons, bearing shells or like thin-walled objects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
- B22D17/24—Accessories for locating and holding cores or inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
- B22D21/002—Castings of light metals
- B22D21/007—Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D25/00—Special casting characterised by the nature of the product
- B22D25/02—Special casting characterised by the nature of the product by its peculiarity of shape; of works of art
-
- 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
- F02F1/00—Cylinders; Cylinder heads
- F02F1/18—Other cylinders
- F02F1/22—Other cylinders characterised by having ports in cylinder wall for scavenging or charging
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
-
- 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
Definitions
- the present invention relates to a method for producing a cylinder for a two-stroke engine and a casting core for this method.
- Such cylinders are typically cast from an aluminum alloy in a gravity casting process using sand cores.
- the problem here is that form very easily casting defects and inclusions. Therefore, it is desirable to cast such cylinders in a die-casting process.
- Sand cores can not be used for this because they do not withstand the pressure conditions prevailing during casting.
- DE 33 31 664 A1 describes a cylinder with closed overflow channels for a two-stroke engine, which is produced by die-casting. To form the overflow channels divided steel cores are used, which are connected to the central core valve for the cylinder chamber. Both the design of the multi-part cores and the distance of the split steel cores for the overflow from the cast cylinder make very complex and cumbersome.
- the object of the present invention is to develop a generic method or a generic casting core so that the casting core can be easily removed from the cast cylinder and is nevertheless suitable for a die-casting process.
- the solution is that initially a casting core is produced, wherein a central core slide for the cylinder space and at least one salt core for a transfer channel is made and the at least one salt core is connected to the central core slider, that the casting core then introduced into a mold and the Cylinder is poured in a die-casting process, then that the central core slider is removed from the cylinder, wherein the at least one salt core is separated from the central core slider and finally the at least one salt core is flushed out of the cylinder.
- the casting core according to the invention is characterized in that it has a central core slide for the cylinder chamber, to which at least one salt core is connected for an overflow channel.
- a salt core connected to a central core slide is so stable that it can withstand the conditions, in particular the pressure conditions, of a die casting process.
- the at least one salt core can be particularly easily flushed out of the cast cylinder in a conventional manner.
- the inventive method or the Gusskem invention thus make it possible to produce cylinders for two-stroke engines, which have at least one overflow, with little effort in the die-casting process.
- the at least one salt core can be produced in a manner known per se by pressing, by injection molding or by sintering.
- Suitable main components are, for example, sodium chloride and / or potassium chloride.
- at least one binder can be added, for example at least one alkali metal carbonate and / or at least one alkaline earth carbonate.
- the central core slider can be made of any materials. Preference is given to metallic materials, in particular steel materials.
- the at least one salt core is preferably connected in a form-fitting manner and without binders to the central core slider.
- inventive method or the casting core according to the invention are particularly suitable for the production of cylinders which are cast in a die-casting process from an aluminum alloy.
- Figure 1 is an exemplary overall view of a cylinder for a two-stroke engine in section
- Figure 2 shows a cylinder for a two-stroke engine with a first embodiment of a casting core according to the invention therein in section;
- FIG. 3 shows the cylinder according to FIG. 1 after removal of the casting core
- Figure 4 shows another embodiment of a casting core according to the invention in a perspective oblique view
- FIG. 5 shows the casting core according to FIG. 4 in a front view
- FIGS. 4 and 5 shows a further cylinder for a two-stroke engine in section, manufactured with a casting core according to FIGS. 4 and 5;
- FIG 1 shows a schematic representation of a cylinder 10 for a two-stroke engine.
- a piston-edge-controlled two-stroke engine is shown. as used, for example, for hand tools such as power saws.
- Such a two-stroke engine has at least one cylinder 10 with a cylinder chamber 11, in which a piston 12, which has a piston head 16, is guided movable up and down.
- the cylinder 10 is closed at one end by a cylinder head 13.
- the other end of the cylinder 10 is attached to a crankcase 14, which is shown only schematically in Figure 1.
- the piston 12 is connected by means of a piston pin and a connecting rod with a crankshaft which is rotatably mounted in the crankcase 14 (not shown).
- a combustion chamber 15 is formed, which is bounded by the cylinder head 13, the piston head 16 of the piston 12 and the cylinder wall 17 of the cylinder chamber 11.
- an overflow channel 18 is shown, which connects the combustion chamber 15 with the crankcase 14.
- the cylinder chamber 11 also has an outlet channel 21 for discharging the resulting combustion gases from the combustion chamber 15.
- Below the junction of the overflow channel 18 into the combustion chamber 15, the cylinder chamber 11 also has an inlet channel 22, via which a fuel-air mixture is introduced into the crankcase 14.
- the outlet channel 21, the inlet channel 22 and the junction of the overflow into the combustion chamber 15 are opened and closed by the reciprocating piston 12 in response to its stroke position.
- the piston 12 compresses on its way to top dead center in the combustion chamber 15th During the subsequent downward stroke of the inlet channel 22 is closed and compressed into the crankcase 14 sucked fresh fuel-air mixture. Then first the outlet channel 22 and then the mouth of the overflow 18 are opened into the combustion chamber 15, and the cycle begins again.
- FIG. 2 shows a cylinder 10 for a two-stroke engine made from an aluminum casting alloy.
- the cylinder 10 was cast in a conventional manner in a die-casting process.
- the casting core 30 used according to the invention has a central core slide 31 and a foot plate 32 provided thereon.
- the core slide 31 serves to form the cylinder space 11.
- the foot plate 32 essentially serves to close the casting mold and, after casting, pull the core slide 31 out of the cast cylinder 10 in the direction of the arrows A.
- the core slide 31 and the base plate 32 are made in the embodiment of the steel material X37CrMoV5-1 cured to 48-52 HRC.
- two salt cores 33 are connected to the core slide 31, which serve to form two overflow channels 18,19.
- the salt cores 33 in the exemplary embodiment consist of pressed sodium chloride or compressed potassium chloride.
- the salt cores 33 are based on the base plate 32 in the exemplary embodiment.
- the finished casting core 30 is placed in a casting mold.
- the cylinder 10 is cast from an aluminum material in a die-casting process.
- the salt cores 33 are sheared off from the core slide 31 and separated from the base plate 32.
- the salt cores 33 are then flushed out of the cylinder 10 in a manner known per se, so that two overflow channels 18, 19 result.
- the support of the salt cores 33 on the base plate 32 causes the transfer channels to have an opening 18a, 19a in the direction of the crankcase to be added later. After adding the crankcase, the transfer ports open into the crankcase.
- FIGS. 4 to 7 show a further exemplary embodiment of a cylinder 110 produced by the method according to the invention and of a cast core 130 used therefor.
- the cylinder 110 has a cylinder space 111, two overflow channels 118, 119, an outlet channel 121 and an inlet channel 122.
- the casting core 130 has, for forming the cylinder space 111, a core slide 131 made of a steel material, in particular made of hot-work steel X37CrMoV5-1 hardened to 48-52 HRC.
- Two core cores 133 for forming the overflow channels 118, 119 are connected to the core slide 131.
- a mold part 121a for forming an exhaust passage 121 and a mold part 122a for molding an intake passage 122 are provided on the central core valve 131.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102010026597A DE102010026597A1 (de) | 2010-07-08 | 2010-07-08 | Verfahren zur Herstellung eines Zylinders für einen Zweitaktmotor sowie Gusskern hierfür |
| PCT/DE2011/001408 WO2012010144A2 (de) | 2010-07-08 | 2011-07-05 | Verfahren zur herstellung eines zylinders für einen zweitaktmotor sowie gusskern hierfür |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2591223A2 true EP2591223A2 (de) | 2013-05-15 |
| EP2591223B1 EP2591223B1 (de) | 2015-03-18 |
Family
ID=45372440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP11808135.5A Not-in-force EP2591223B1 (de) | 2010-07-08 | 2011-07-05 | Verfahren zur herstellung eines zylinders für einen zweitaktmotor sowie gusskern hierfür |
Country Status (5)
| Country | Link |
|---|---|
| US (2) | US20130264022A1 (de) |
| EP (1) | EP2591223B1 (de) |
| CN (1) | CN102985675B (de) |
| DE (1) | DE102010026597A1 (de) |
| WO (1) | WO2012010144A2 (de) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011079356A1 (de) * | 2011-07-18 | 2013-01-24 | Mahle International Gmbh | Gießkern einer Gussform zur Herstellung eines Zylinders |
| DE102015216224A1 (de) * | 2015-08-25 | 2017-03-02 | Volkswagen Aktiengesellschaft | Gussform mit integrierten Kernlagerbolzen und Verfahren zur Herstellung eines Gussbauteils |
| DE102015216452A1 (de) * | 2015-08-27 | 2017-03-16 | Volkswagen Aktiengesellschaft | Werkzeug und Kokillengießverfahren zur Herstellung eines Zylinderkurbelgehäuses |
| DE102017205853A1 (de) | 2017-04-06 | 2018-10-11 | Bayerische Motoren Werke Aktiengesellschaft | Kernpaket |
| WO2021101102A1 (ko) * | 2019-11-21 | 2021-05-27 | 주식회사 평화발레오 | 마스터 실린더 제조방법 |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1465486A (en) * | 1973-04-18 | 1977-02-23 | Aeroplane Motor Alu Cast | Method and apparatus for forming a curved passage in a casting and a casting so formed |
| US4003422A (en) * | 1975-04-21 | 1977-01-18 | Schramm Buford J | Process for making a composite cylinder head assembly |
| US4252175A (en) * | 1979-05-25 | 1981-02-24 | Outboard Marine Corporation | Cylinder block having a cast-in core unit and process for manufacturing same |
| US4446906A (en) * | 1980-11-13 | 1984-05-08 | Ford Motor Company | Method of making a cast aluminum based engine block |
| DE3331664A1 (de) | 1983-09-02 | 1985-03-21 | Fichtel & Sachs Ag, 8720 Schweinfurt | Zylinder fuer hubkolben-brennkraftmaschine, insbesondere zweitakt-brennkraftmaschine |
| JP2797187B2 (ja) * | 1988-06-06 | 1998-09-17 | 本田技研工業株式会社 | 2サイクルエンジン用シリンダブロックの鋳造方法 |
| JP3747115B2 (ja) | 1997-05-16 | 2006-02-22 | 株式会社共立 | ダイカスト鋳造用中子 |
| US6527039B2 (en) * | 2001-06-11 | 2003-03-04 | General Motors Corporation | Casting of engine blocks |
| ITBS20020088A1 (it) * | 2002-10-04 | 2004-04-05 | Meccanica Bassi Spa | Procedimento di fusione, in particolare per testa cilindri di motori |
| DE102006001946B8 (de) * | 2006-01-14 | 2010-06-02 | Audi Ag | Zylinderbuchseneinlegeteil für ein Zylindergehäuse einer Hubkolben-Brennkraftmaschine und Verfahren zur Herstellung eines solchen Zylinderbuchseneinlegeteils |
| DE102007014146A1 (de) * | 2007-03-23 | 2007-11-22 | Daimlerchrysler Ag | Druckgießwerkzeug |
| DE102007023060A1 (de) * | 2007-05-16 | 2008-11-20 | Daimler Ag | Verfahren zur Herstellung eines Zylinderkurbelgehäuses |
| CN201081012Y (zh) * | 2007-09-05 | 2008-07-02 | 山东滨州渤海活塞股份有限公司 | 异型内冷油腔结构活塞 |
| CN101391280B (zh) * | 2007-09-18 | 2011-02-09 | 山东滨州渤海活塞股份有限公司 | 压力铸造用异型盐芯 |
-
2010
- 2010-07-08 DE DE102010026597A patent/DE102010026597A1/de not_active Withdrawn
-
2011
- 2011-07-05 EP EP11808135.5A patent/EP2591223B1/de not_active Not-in-force
- 2011-07-05 US US13/808,702 patent/US20130264022A1/en not_active Abandoned
- 2011-07-05 WO PCT/DE2011/001408 patent/WO2012010144A2/de not_active Ceased
- 2011-07-05 CN CN201180033482.5A patent/CN102985675B/zh not_active Expired - Fee Related
-
2015
- 2015-12-01 US US14/955,303 patent/US20160089716A1/en not_active Abandoned
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2012010144A2 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2591223B1 (de) | 2015-03-18 |
| CN102985675A (zh) | 2013-03-20 |
| CN102985675B (zh) | 2016-04-27 |
| WO2012010144A3 (de) | 2012-06-07 |
| DE102010026597A1 (de) | 2012-01-12 |
| US20130264022A1 (en) | 2013-10-10 |
| WO2012010144A2 (de) | 2012-01-26 |
| US20160089716A1 (en) | 2016-03-31 |
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