EP0073294A2 - Verfahren zum Herstellen einer Schalenform - Google Patents

Verfahren zum Herstellen einer Schalenform Download PDF

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Publication number
EP0073294A2
EP0073294A2 EP82104085A EP82104085A EP0073294A2 EP 0073294 A2 EP0073294 A2 EP 0073294A2 EP 82104085 A EP82104085 A EP 82104085A EP 82104085 A EP82104085 A EP 82104085A EP 0073294 A2 EP0073294 A2 EP 0073294A2
Authority
EP
European Patent Office
Prior art keywords
mold
molding material
manufacturing
shell
set forth
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
Application number
EP82104085A
Other languages
English (en)
French (fr)
Other versions
EP0073294B1 (de
EP0073294A3 (en
Inventor
Shigefumi Nagano
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.)
JFE Pipe Fitting Mfg Co Ltd
Original Assignee
Nippon Kokan Pipe Fitting Mfg Co Ltd
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 Nippon Kokan Pipe Fitting Mfg Co Ltd filed Critical Nippon Kokan Pipe Fitting Mfg Co Ltd
Publication of EP0073294A2 publication Critical patent/EP0073294A2/de
Publication of EP0073294A3 publication Critical patent/EP0073294A3/en
Application granted granted Critical
Publication of EP0073294B1 publication Critical patent/EP0073294B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C13/00—Moulding machines for making moulds or cores of particular shapes
    • B22C13/08—Moulding machines for making moulds or cores of particular shapes for shell moulds or shell cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/003—Pressing by means acting upon the material via flexible mould wall parts, e.g. by means of inflatable cores, isostatic presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/006—Pressing by atmospheric pressure, as a result of vacuum generation or by gas or liquid pressure acting directly upon the material, e.g. jets of compressed air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
    • B28B7/346—Manufacture of moulds

Definitions

  • the present invention relates to a method of manufacturing a shell mold excellent in permeability and other properties.
  • a method of manufacturing a shell mold of this type in which a preheated mold is charged with molding material, such as silica sand mixed with phenolic resin as a caking agent, the molding material is solidified along the forming surface of the mold, the mold is turned over to shake off the excessive molding material and then heated to solidify the shell-shape molding material sticked to the mold, thereby to form a shell, and the shell is finally taken out from the mold, whereby a shell mold is produced.
  • molding material such as silica sand mixed with phenolic resin as a caking agent
  • the expansion and/or contraction of the metal mold reduce the dimensional precision of a shell mold, and energy consumption is disadvantageously increased.
  • uneven thickness of the metal mold results in uneven heat capacity thereof, which easily causes the shell thickness to become uneven.
  • the molding material is limited to phenolic resin or the like which can be heatingly solidified, with a narrow range of choice as to a caking agent.
  • the use of expensive molding material is unavoidable.
  • a mold 1 horizontally held under a mold 1 is an elastic member in the sheet or film form, for example a vinyl sheet 2. Fire-resisting granular molding material 3 is suitably put on this vinyl sheet 2.
  • the mold 1 comprises a hollow suction box 4 having an air intake port 4a connected to a suction means such as a vacuum pump (not shown ), a pattern plate 5 having a pattern 5a of predetermined shape and disposed below the suction box 4, and an outer frame 6 surrounding the circumference of the pattern plate 5.
  • the pattern plate 5 has therein a suitable number of suction holes 7 which open in the forming surface 5b of the pattern plate 5 and communicate with the inside of the suction box 4. As shown in Fig. 5, each of the suction holes 7 has a filter 8 made of a net member or the like to prevent the molding material from entering into the hole 7.
  • the outer frame 6 has in the entire lower periphery thereof a suction groove 9a and a suitable number of air holes 9b which open in the suction groove 9a and communicate with the inside of the suction box 4.
  • the vinyl sheet 2 has a circumference suitably larger than that of the outer frame 6 of the mold 1.
  • the molding material 3 is put on the vinyl sheet 2 at the center portion thereof such that the circumference of the molding material 3 put on the vinyl sheet 2 is suitably smaller than the inner circumference of the outer frame 6.
  • the molding material 3 put on the vinyl sheet 2 has a substantially uniform thickness.
  • the molding material 3 is constituted by silica sand to which 2 to 7% of sodium silicate is added as a caking agent. Such molding material 3 is adapted to be solidifed by passing carbonic acid gas through the molding material 3. in an ambient temperature. As necessary, facing sand 3a may be put on the surface of the molding material 3 in order to obtain a good mold surface, as shown in Fig. 1.
  • the mold 1 is lowered such that the lower end of the outer frame 6 of the mold I comes in contact with that peripheral portion 2a of the vinyl sheet 2 on which the molding material 3 is not put.
  • the pressure in the suction box 4 is reduced by operating the suction means (not shown ) connected to the air intake port 4.
  • the peripheral portion 2a of the vinyl sheet 2 is adsorbed to the lower end of the outer frame 6 by a suction force acting on the suction groove 9a through the air holes 9b.
  • a negative pressure is then produced in the space surrounded by the vinyl sheet 2 and the mold 1, through the suction holes 7.
  • the molding material 3 is formed into a shell shape along the forming surface 5b of the mold 1. Namely, since a negative pressure is produced at the side of the molding material 3 on the vinyl sheet 2, the vinyl sheet 2 is extendingly pressed toward the forming surface 5b by the outside pressure.
  • the molding material 3 is then pressingly held and formed by the mold 1 and the vinyl sheet 2 as shown in Fig. 2. In this step, the molding material 3 is compressingly formed into a shell shape having a substantially uniform thickness along the forming surface 5b.
  • the mold 1 With the molding material 3 maintained as it is, the mold 1 is turned over as shown in Fig. 3. Carbonic acid gas then passes through the molding material 3 by a suitable means. At this time, a shock or vibration may be applied to the molding material 3 by a vibrator or the like (not shown ) such that the molding material 3 is further uniformly or evenly distributed.
  • the shell is taken out from the mold 1 by a suitable means (not shown ) and the vinyl sheet 2 is taken off from the shell, so that a desired shell mold 3' is obtained. It is to be noted that the vinyl sheet 2 may be taken off before carbonic acid gas passes through the molding material 3.
  • the molding material 3 is solidified as pressingly held and formed into a shell shape along the forming surface 5b, by the mold 1 and the vinyl sheet 2.
  • Such solidification is made according to the C0 2 process above-mentioned which requires no heating step. This eliminates the necessity of using an expensive metal mold difficult to manufacture, as the mold 1 and in particular the pattern 5a of complicated shape. That is, there may be used an economical wooden, gypsum or resin mold easy to manufacture.
  • the mold 1 may be economically manufactured in a short period of time, thus presenting an advantage that a prompt action can be taken when an order is received.
  • the mold 1 since it is not required to heat the mold 1, the mold 1 is not deformed, i.e., neither expanded nor contracted. Thus, precision of the shell mold 3' may be greatly improved.
  • the mold surface 3'a of the shell mold 3' may be made fine, thereby to improve the mold surface.
  • solidification of the molding material 3 may be made according to various methods to be applied in an ambient temperature, such as a cold box process.
  • an ambient temperature such as a cold box process.
  • sodium silicate there may be suitably used other inorganic or organic caking agents.
  • molding material formed by silica sand mixed with 2 to 7% of sodium silicate or 1 to 3% of a water solution of starch is pressingly held and formed into a shell shape in the same manner as above-mentioned.
  • the mold 1 may be heated within limits not thermally prejudiciary to the mold 1. Namely, the molding material 3 may be solidified by suitable means either in a cold atmosphere or a warm atmosphere, dependent on the characteristics of the mold 1. However, it is a matter of course that the foregoing does not prohibit the use of a metal mold.
  • the mold 1 With the molding material 3 pressingly held and formed into a shell by the mold 1 and the vinyl sheet 2, the mold 1 is turned over and the molding material 3 is solidified. Therefore, a dense shell having a uniform thickness may be formed and no peel-back takes place.
  • the molding material 3 is not required to be heated to a high temperature, but may be solidified in a cold or warm atmosphere. Therefore, gas is not generated, or even if generated, the amount is extremely small, and no operations in a high temperature are required, thus presenting an advantage in view of environmental sanitation. Even if gas should be generated, such gas may be quickly eliminated from the air intake port 4a of the suction box 4 through the suction holes 7.
  • vinyl sheet 2 is used as the elastic member in the embodiment discussed hereinbefore, an elastic sheet or film for example a rubber sheet may also be used.
  • the molding material 3 is not limited to silica sand mixed with sodium silicate or a water solution of starch to be solidified according to the CO 2 process or the like, but can be suitably selected dependent on a selected solidification process.
  • the number of the pattern plates is not limited to one as done in the embodiment shown in Fig. 1, but a plurality of pattern plates may be disposed. Thus, various kinds of shell molds can be conveniently manufactured at the same time.
  • the molding material 3 is solidified after the mold 1 has been turned over, the molding material may be solidifed in the step shown in Fig. 2 before the mold 1 is turned over.
  • a shell removing agent may be suitably applied to the forming surface 5b of the mold 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Casting Devices For Molds (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Mold Materials And Core Materials (AREA)
EP82104085A 1981-08-25 1982-05-11 Verfahren zum Herstellen einer Schalenform Expired EP0073294B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP133096/81 1981-08-25
JP13309681A JPS5835041A (ja) 1981-08-25 1981-08-25 シエル鋳型の製造方法

Publications (3)

Publication Number Publication Date
EP0073294A2 true EP0073294A2 (de) 1983-03-09
EP0073294A3 EP0073294A3 (en) 1983-07-27
EP0073294B1 EP0073294B1 (de) 1986-08-13

Family

ID=15096735

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82104085A Expired EP0073294B1 (de) 1981-08-25 1982-05-11 Verfahren zum Herstellen einer Schalenform

Country Status (3)

Country Link
EP (1) EP0073294B1 (de)
JP (1) JPS5835041A (de)
DE (1) DE3272547D1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101837429A (zh) * 2010-05-31 2010-09-22 齐齐哈尔轨道交通装备有限责任公司 二氧化碳硬化水玻璃砂铁模射砂造型方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2566687B1 (fr) * 1984-06-27 1986-08-22 Air Liquide Dispositif de fabrication de moules ou de noyaux de moulage congeles
JP2016131996A (ja) * 2015-01-19 2016-07-25 ヨシワ工業株式会社 鋳型

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD93227A (de) *
DE2150269A1 (de) * 1971-06-25 1973-01-11 Akita Susaka Kk Formverfahren und formgeraet
DE2407878B1 (de) * 1974-02-19 1975-05-15 Wagner Maschf Heinrich Kastenlose Giessform
DE2606291A1 (de) * 1975-02-18 1976-08-26 Asahi Glass Co Ltd Verfahren zum formen von zementartigen massen
DE2508276A1 (de) * 1975-02-26 1976-09-02 Buderus Eisenwerk Giessform und verfahren zu ihrer herstellung
DE2352492B2 (de) * 1973-10-19 1977-08-25 Wittmoser, Adalbert, Prof Dr-Ing, 6840 Lampertheim Verfahren zur herstellung von durch unterdruck stabilisierten, hohlen giessformen
AT338448B (de) * 1974-11-22 1977-08-25 Mitsubishi Heavy Ind Ltd Unterdruckformverfahren zur herstellung einer giessform
DE2833999A1 (de) * 1978-08-03 1980-02-14 Buehler Eugen Verfahren und vorrichtung zur herstellung von giessformen und -kernen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5093821A (de) * 1973-12-25 1975-07-26
JPS5289522A (en) * 1976-01-23 1977-07-27 Mitsubishi Heavy Ind Ltd Mold manufacturing method

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD93227A (de) *
DE2150269A1 (de) * 1971-06-25 1973-01-11 Akita Susaka Kk Formverfahren und formgeraet
DE2352492B2 (de) * 1973-10-19 1977-08-25 Wittmoser, Adalbert, Prof Dr-Ing, 6840 Lampertheim Verfahren zur herstellung von durch unterdruck stabilisierten, hohlen giessformen
DE2407878B1 (de) * 1974-02-19 1975-05-15 Wagner Maschf Heinrich Kastenlose Giessform
AT338448B (de) * 1974-11-22 1977-08-25 Mitsubishi Heavy Ind Ltd Unterdruckformverfahren zur herstellung einer giessform
DE2606291A1 (de) * 1975-02-18 1976-08-26 Asahi Glass Co Ltd Verfahren zum formen von zementartigen massen
DE2508276A1 (de) * 1975-02-26 1976-09-02 Buderus Eisenwerk Giessform und verfahren zu ihrer herstellung
DE2833999A1 (de) * 1978-08-03 1980-02-14 Buehler Eugen Verfahren und vorrichtung zur herstellung von giessformen und -kernen

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
GIEBEREI-LEXIKON, 1978, FACHVERLAG SCHIELE & SCHÖN, Markgrafenstrasse 11, D-100 Berlin 61, pages 818-821 *
GIEBEREI-LEXIKON, 1978, FACHVERLAG SCHIELE & SCHON, Markgrafenstrasse 11, D-1000 Berlin 61; pages 818-821 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101837429A (zh) * 2010-05-31 2010-09-22 齐齐哈尔轨道交通装备有限责任公司 二氧化碳硬化水玻璃砂铁模射砂造型方法

Also Published As

Publication number Publication date
JPH0153143B2 (de) 1989-11-13
DE3272547D1 (en) 1986-09-18
EP0073294B1 (de) 1986-08-13
JPS5835041A (ja) 1983-03-01
EP0073294A3 (en) 1983-07-27

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