US3913660A - Chill mold for casting pistons - Google Patents

Chill mold for casting pistons Download PDF

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Publication number
US3913660A
US3913660A US414494A US41449473A US3913660A US 3913660 A US3913660 A US 3913660A US 414494 A US414494 A US 414494A US 41449473 A US41449473 A US 41449473A US 3913660 A US3913660 A US 3913660A
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US
United States
Prior art keywords
cylinder
casting
steel cylinder
piston
chill mold
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.)
Expired - Lifetime
Application number
US414494A
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English (en)
Inventor
Adolf Diez
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.)
Karl Schmidt GmbH
Original Assignee
Karl Schmidt 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 Karl Schmidt GmbH filed Critical Karl Schmidt GmbH
Priority to US05/566,152 priority Critical patent/US3995680A/en
Application granted granted Critical
Publication of US3913660A publication Critical patent/US3913660A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
    • 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
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
    • B22D27/045—Directionally solidified castings

Definitions

  • ABSTRACT Chill mold for casting piston blanks, e.g. for internal combustion engines, from metals such as aluminum alloys, includes a steel cylinder, an inner core for reproducing the inner contours of a piston, and a spray ring which surrounds the cylinder.
  • the spray ring delivers cooling water to the exterior of the cylinder which flows down forming a water curtain around the cylinder.
  • This invention relates to a chill mold consisting of a steel cylinder for making piston castings, especially from aluminum alloys, preferably for internal combustion engines, and having an inserted internal core reproducing the internal contours of the piston.
  • the chill casting process is assuming importance in the production of pistons from aluminum alloys.
  • the metal is cast in reusable metal molds, the molds being filled generally either by gravity or by low gas pressure.
  • the chill casting process is well suited to the production of pistons from aluminum alloys because aluminum alloys have good castability and the casting temperatures assure that the mold can be used for a relatively long period of time for approximately 30,000 to 50,000 castings and thus assure good economy.
  • Low and medium numbers of piston castings are generally made in multi-sectional hinged molds operated by hand, into which a multi-sectional internal core of metal, especially steel, assembled by hand, is inserted.
  • the piston head is facing downwardly and the pouring gate discharges into one of the two laterally mounted feeders.
  • the filling of the chill is performed by gravity and the solidification takes place under air pressure
  • the metal is forced into the chill by a gas pressure of about 0.2 to 0.3 atmospheres gauge, and it hardens in the chill under this pressure.
  • the bottom aperture of the chill is located on a riser tube from a reheating furnace which contains the molten metal and is hermetically sealed with a cover.
  • the chill, in which the piston head faces downwardly, is filled with molten metal through the riser tube.
  • the flow of the molten metal into the chill may be con trolled through the gas pressure and the inflow crosssection, so that the cavity in the chill can be filled without turbulence.
  • the so-called fine-grain method of casting large pistons offers a substantial improvement of technological properties in comparison with the last-described method.
  • a steel cylinder having a watercooled bottom is filled with the molten piston alloy in which a special sand core is then suspended in a precisely centered manner.
  • Gas burners directed against the outer periphery of the steel cylinder serve to keep the melt hot and prevent the upwardly pointing thinwalled cross-sections of the piston from hardening more rapidly than the piston head.
  • the steel cylinder is then lowered into a water bath in a timed manner causing the solidification to progress strictly from the bottom upwardly at a prescribed rate of speed. In this manner a controlled fine-grain solidification of the material is achieved, thereby creating good technological properties.
  • the invention achieves this object with a chill consisting of a steel cylinder in which the internal core is suspended and which is surrounded by a water-carrying spray ring by means of which cooling water is sprayed against the outer periphery of the steel cylinder and which may be disposed, if desired, so as to be adjustable to various heights according to the manner in which the solidification is to be controlled.
  • the cooling water flows downwardly forming a water curtain around the steel cylinder and collects, if desired, in a water collecting tank surrounding the bottom end of the steel cylinder. In this manner not only is the solidification of the metal greatly accelerated, but also solidification is made to take place in the natural direction of solidification.
  • FIG. 1 is a cross-sectional view taken through a steel cylinder which is placed with its bottom aperture on a matingly constructed fitting of the riser of a lowpressure casting furnace and which has a multisectional, cooled steel core;
  • FIG. 2 is a cross-section taken through a steel cylinder placed with its bottom aperture on the matingly constructed fitting of the riser of a low-pressure casting furnace as in FIG. 1, but with a sand core;
  • FIG. 3 is a cross-sectional view of a further embodiment of the invention.
  • the water curtain produced by the spray ring may be limited in length by an annular, preferably vertically displaceable apron surrounding the steel cylinder moving downwardly in the direction of solidification at a rate depending on the desired course of the solidification, so that repeatable and optimum cooling conditions will be assured.
  • the water curtain can be broken away from the outer periphery of the steel cylinder by an air curtain produced in the gap formed between the inner circumference of the apron and the steel cylinder.
  • the spray ring may be disposed so as to be vertically displaceable, especially in a timed manner.
  • the internal core is inserted into the top aperture of the steel cylinder, and where the casting is performed by the effect of gravity it is inserted into the bottom aperture.
  • the steel cylinder 1 is placed with its bottom aperture on a fitting 3 which is joined to the riser 2 of the low-pressure casting furnace and whose diameter corresponds to the inside diameter of the steel cylinder 1.
  • the curtain of water forming about the steel cylinder 1 and descending thereon is separated from the cylinder adjacent the top edge of fitting 3 by the annular apron 8 surrounding the steel cylinder in that air is injected upwardly into the gap 9 between the steel cylina der 1 and the inner circumference of apron 8.
  • the water descending along the steel cylinder 1 collects in a water pan l surrounding the latter.
  • the fitting 3 may also be cooled through the annular passage 11 so as to complete solidification in a minimum of time.
  • the central portion 12 of steel core may be additionally cooled through line 13.
  • the feeding of the still molten metal is continued by further application of pressure to the bath surface as the solidification of the metal in the cavity progresses downwardly from the top and away from the watercooled steel cylinder 1.
  • the casting is removed from steel cylinder 1 and then the steel core 5 or sand core 14 is removed in the conventional manner.
  • the steel cylinder 15, whose bottom aperture is closed by a multi-sectional steel core 17 inserted into the core guiding collar 16, can be filled by the effect of gravity by pouring molten piston alloy through the upper aperture of steel cylinder into the cavity 18 by means of the pouring ladle 19.
  • the pouring ladle 19 is placed with its pouring spout 20 on the inside top edge of steel cylinder 15 in order to assure that when the molten metal flows into steel cylinder 15 no foam or oxide will form on its inner wall.
  • the steel cylinder 15 is surrounded by the vertically displaceable spray ring 21 by which the steel cylinder 15 is covered downwardly with a curtain of water.
  • the cooling water collects in the water pan 22 sur- I rounding the lower end of the steel cylinder 15.
  • the steel core 17 may be cooled through the cooling water,
  • the steel cylinder 15 be turned a certain amount about is long axis so as to equalize thermal stresses as well as wear.
  • Chill mold comprising cylinder means for casting piston blanks having an inserted inner core means reproducing the inner contours of the piston, said cylinder means being surrounded by conical annular apron, I
  • said cylinder having an upper aperture into which said inner core means is inserted, said cylinder means having a lower aperture placed on a correspondingly constructed fitting joined to a riser, tube of a low-pressure casting furnace, said cylindermeans being surrounded by a spray ring means adjustable in height carrying I said riser tube.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Continuous Casting (AREA)
US414494A 1972-11-14 1973-11-09 Chill mold for casting pistons Expired - Lifetime US3913660A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US05/566,152 US3995680A (en) 1972-11-14 1975-04-08 Method of cooling piston blank molds

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2255644A DE2255644B2 (de) 1972-11-14 1972-11-14 Verfahren und Kokille zum Gießen von Kolbenrohlingen

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US05/566,152 Division US3995680A (en) 1972-11-14 1975-04-08 Method of cooling piston blank molds

Publications (1)

Publication Number Publication Date
US3913660A true US3913660A (en) 1975-10-21

Family

ID=5861633

Family Applications (1)

Application Number Title Priority Date Filing Date
US414494A Expired - Lifetime US3913660A (en) 1972-11-14 1973-11-09 Chill mold for casting pistons

Country Status (10)

Country Link
US (1) US3913660A (enrdf_load_stackoverflow)
JP (1) JPS5039610B2 (enrdf_load_stackoverflow)
AT (1) AT330383B (enrdf_load_stackoverflow)
BR (1) BR7308936D0 (enrdf_load_stackoverflow)
DE (1) DE2255644B2 (enrdf_load_stackoverflow)
FR (1) FR2206145B3 (enrdf_load_stackoverflow)
GB (1) GB1455455A (enrdf_load_stackoverflow)
IT (1) IT999313B (enrdf_load_stackoverflow)
SU (1) SU504463A3 (enrdf_load_stackoverflow)
ZA (1) ZA738717B (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5363900A (en) * 1992-04-16 1994-11-15 Thyssen Guss Ag Steel mold especially for permanent mold casting of metal
US20050185504A1 (en) * 2004-02-23 2005-08-25 New Castle Industries, Inc. Enhanced Thermal conduction in apparatus for plasticating resinous material
WO2012162035A3 (en) * 2011-05-24 2013-04-18 F&S Tool, Inc. Molding device with successive stage cooling channels
CN107511468A (zh) * 2017-09-05 2017-12-26 哈尔滨工业大学 大型船舶用铜合金螺旋桨反重力成形气冷喉截止升液方法
CN107695322A (zh) * 2017-09-29 2018-02-16 张勇 一种制备泡沫铝及泡沫铜的装置及其制备方法
CN108031794A (zh) * 2018-01-18 2018-05-15 宜兴市环宇轴瓦制造有限公司 水泥回转窑托轮轴衬瓦铸造装置及铸造方法
CN108607973A (zh) * 2018-04-24 2018-10-02 山东省科学院新材料研究所 一种生成细长柱状晶凝固组织的铝合金铸造方法
US11498121B2 (en) 2019-03-14 2022-11-15 General Electric Company Multiple materials and microstructures in cast alloys
US11597005B2 (en) 2018-10-05 2023-03-07 General Electric Company Controlled grain microstructures in cast alloys

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2728048C2 (de) * 1977-06-22 1979-05-23 Mahle Gmbh, 7000 Stuttgart Verfahren zur Herstellung eines FormguBteiles
RU2138363C1 (ru) * 1998-05-12 1999-09-27 Открытое акционерное общество "ГАЗ" Устройство для получения отливок стержней с развитым фланцем
CN106311982A (zh) * 2015-06-17 2017-01-11 株式会社日立制作所 金属型铸造模具中的竖向中子的设计方法以及该金属型铸造模具
CN111545729B (zh) * 2020-06-03 2024-11-12 无锡蠡湖新质节能科技有限公司 一种冷铁网格线加工设备及其加工工艺
CN112643010A (zh) * 2020-12-01 2021-04-13 东风汽车有限公司 电机壳低压铸造凸模
US20220241847A1 (en) 2021-02-01 2022-08-04 GM Global Technology Operations LLC Profile chill for forming a cast device
CN115608957A (zh) * 2022-10-31 2023-01-17 哈尔滨工业大学 一种镁合金反重力铸造设备及该设备浇注阻燃方法

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1751038A (en) * 1926-07-03 1930-03-18 Dow Chemical Co Casting magnesium and alloys thereof
US1764889A (en) * 1929-06-07 1930-06-17 Harry J Hater Mold
US1836310A (en) * 1926-12-29 1931-12-15 Cordes Frank Cooling means for ingot molds
US1993439A (en) * 1933-05-31 1935-03-05 Sterling Corp Molding machine
US2065287A (en) * 1929-03-27 1936-12-22 Gen Motors Corp Piston molding apparatus
US2527537A (en) * 1947-06-03 1950-10-31 Permold Co Piston mold
US2755528A (en) * 1950-01-27 1956-07-24 Schmidt Gmbh Karl Apparatus and method for the casting of shaped articles or machine parts
US2824347A (en) * 1952-11-21 1958-02-25 Bohn Aluminium & Brass Corp Molding machine
US3068539A (en) * 1960-08-04 1962-12-18 Thompson Ramo Wooldridge Inc High pressure permanent molding
US3078529A (en) * 1959-04-24 1963-02-26 Titanium Metals Corp Melting crucible and cooling means therefor
US3448790A (en) * 1966-04-12 1969-06-10 Ass Elect Ind Molds for electroslag refining

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1751038A (en) * 1926-07-03 1930-03-18 Dow Chemical Co Casting magnesium and alloys thereof
US1836310A (en) * 1926-12-29 1931-12-15 Cordes Frank Cooling means for ingot molds
US2065287A (en) * 1929-03-27 1936-12-22 Gen Motors Corp Piston molding apparatus
US1764889A (en) * 1929-06-07 1930-06-17 Harry J Hater Mold
US1993439A (en) * 1933-05-31 1935-03-05 Sterling Corp Molding machine
US2527537A (en) * 1947-06-03 1950-10-31 Permold Co Piston mold
US2755528A (en) * 1950-01-27 1956-07-24 Schmidt Gmbh Karl Apparatus and method for the casting of shaped articles or machine parts
US2824347A (en) * 1952-11-21 1958-02-25 Bohn Aluminium & Brass Corp Molding machine
US3078529A (en) * 1959-04-24 1963-02-26 Titanium Metals Corp Melting crucible and cooling means therefor
US3068539A (en) * 1960-08-04 1962-12-18 Thompson Ramo Wooldridge Inc High pressure permanent molding
US3448790A (en) * 1966-04-12 1969-06-10 Ass Elect Ind Molds for electroslag refining

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5363900A (en) * 1992-04-16 1994-11-15 Thyssen Guss Ag Steel mold especially for permanent mold casting of metal
US20050185504A1 (en) * 2004-02-23 2005-08-25 New Castle Industries, Inc. Enhanced Thermal conduction in apparatus for plasticating resinous material
US7063453B2 (en) 2004-02-23 2006-06-20 Xaloy, Inc. Enhanced thermal conduction in apparatus for plasticating resinous material
WO2012162035A3 (en) * 2011-05-24 2013-04-18 F&S Tool, Inc. Molding device with successive stage cooling channels
US8585392B2 (en) 2011-05-24 2013-11-19 F&S Tool, Inc. Compression molding with successive stage cooling channels
US9475246B2 (en) 2011-05-24 2016-10-25 F&S Tool, Inc. Method of molding and mold with succesive stage cooling channels
CN107511468A (zh) * 2017-09-05 2017-12-26 哈尔滨工业大学 大型船舶用铜合金螺旋桨反重力成形气冷喉截止升液方法
CN107695322A (zh) * 2017-09-29 2018-02-16 张勇 一种制备泡沫铝及泡沫铜的装置及其制备方法
CN108031794A (zh) * 2018-01-18 2018-05-15 宜兴市环宇轴瓦制造有限公司 水泥回转窑托轮轴衬瓦铸造装置及铸造方法
CN108607973A (zh) * 2018-04-24 2018-10-02 山东省科学院新材料研究所 一种生成细长柱状晶凝固组织的铝合金铸造方法
US11597005B2 (en) 2018-10-05 2023-03-07 General Electric Company Controlled grain microstructures in cast alloys
US11498121B2 (en) 2019-03-14 2022-11-15 General Electric Company Multiple materials and microstructures in cast alloys

Also Published As

Publication number Publication date
JPS49135818A (enrdf_load_stackoverflow) 1974-12-27
ZA738717B (en) 1975-07-30
IT999313B (it) 1976-02-20
ATA960173A (de) 1975-09-15
SU504463A3 (ru) 1976-02-25
DE2255644B2 (de) 1975-01-09
GB1455455A (en) 1976-11-10
JPS5039610B2 (enrdf_load_stackoverflow) 1975-12-18
FR2206145A1 (enrdf_load_stackoverflow) 1974-06-07
BR7308936D0 (pt) 1974-08-22
DE2255644A1 (de) 1974-05-30
AT330383B (de) 1976-06-25
FR2206145B3 (enrdf_load_stackoverflow) 1976-09-24

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