EP0125510A2 - Procédé de fabrication de coulées de précision - Google Patents

Procédé de fabrication de coulées de précision Download PDF

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Publication number
EP0125510A2
EP0125510A2 EP84104214A EP84104214A EP0125510A2 EP 0125510 A2 EP0125510 A2 EP 0125510A2 EP 84104214 A EP84104214 A EP 84104214A EP 84104214 A EP84104214 A EP 84104214A EP 0125510 A2 EP0125510 A2 EP 0125510A2
Authority
EP
European Patent Office
Prior art keywords
mold
poured
water
molding compound
molding
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
EP84104214A
Other languages
German (de)
English (en)
Other versions
EP0125510A3 (en
EP0125510B1 (fr
Inventor
Fritz Fässle
Siegmund Stadler
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.)
BK Giulini Chemie GmbH
Original Assignee
Giulini Chemie 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
Priority claimed from DE3316571A external-priority patent/DE3316571C2/de
Priority claimed from DE3320309A external-priority patent/DE3320309C2/de
Application filed by Giulini Chemie GmbH filed Critical Giulini Chemie GmbH
Priority to AT84104214T priority Critical patent/ATE54080T1/de
Publication of EP0125510A2 publication Critical patent/EP0125510A2/fr
Publication of EP0125510A3 publication Critical patent/EP0125510A3/de
Application granted granted Critical
Publication of EP0125510B1 publication Critical patent/EP0125510B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B22D27/15—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/12—Treating moulds or cores, e.g. drying, hardening

Definitions

  • the present invention relates to a new process for the production of molded parts with sharp detail reproduction and high measuring accuracy according to a new molding process, as well as the precision casting produced with this molding process.
  • the new molding process is particularly suitable for high-melting metals and alloys.
  • Molding method for refractory metals are sawn k a nnt, including those for precision castings.
  • the best-known precision casting molding process is the wax model casting process, in which the model is melted out to create the mold cavity.
  • plastic or frozen mercury is used as the model material.
  • a disadvantage of these molding processes is that a number of aids and additional measures are required to achieve precision casting, so that investment casting as an industrial mass production medium is still considered unsatisfactory in many branches of industry, in particular too costly and labor-intensive.
  • models for high-melting ferrous and non-ferrous metals have to be surrounded with a fine layer of a fine-grained, high-quality, mostly silicate-bonded ceramic molding material, as this is the only way to create a smooth surface and the finest contours can be reproduced. Only then can the molding material, which gives the casting mold the necessary stability to withstand the casting pressure, can be poured into the molding box. The object was therefore to find a process for the production of precision castings which is particularly suitable for high-melting metals and alloys and does not have the above disadvantages.
  • the main characteristic of the new process is that the adhering water of the molding compound is removed by pressure drainage. In this way, considerable amounts of energy can be consumed can be saved, so that the casting process can now also be used for large-area precision castings and series castings.
  • the evacuation during metal casting additionally reduces the energy requirement, it also being advantageous that pressure drainage and evacuation can be carried out using the same system (drainage device).
  • quartz sand and / or zircon sand which contains a phosphate binder, produced from active magnesium oxide or active magnesium hydroxide and monoammonium orthophosphate, as a high-temperature binder.
  • Setting retarders and other auxiliaries for example temperature-resistant fillers, can optionally be added to the mixture.
  • the active magnesium oxide reacts with the ammonium orthophosphate to generate heat, depending on the reactivity of the magnesium oxide, the concentration of ammonium magnesium orthophosphate and the amount of water, the solidification process begins.
  • the amount of water must also be adjusted to the desired pore volume of the molds so that there is sufficient gas permeability when the drainage device is started up according to the invention.
  • the pore volume should be about 15%. With a defined grain distribution of the quartz and / or zircon sand (a few / u to 3 mm), a smooth surface of the mold is achieved. Since the magnesium orthophosphate formed contains 6 molecules of water of crystallization, a calcination is required after the solidification process has ended. The calcination temperature should be at least 250 ° C, so that a part of the bound ammonia is released in addition to the water of crystallization. In this way, degassing is facilitated during the casting process and the surface quality of the casting is improved.
  • High-melting metals and metal alloys are understood here to mean those whose melting point is above 1000 ° C., in particular above 1100 ° C.
  • a drain in the form of a porous tube or a perforated glass fiber mat is applied over the original to be molded, which is coated with a release agent.
  • this is expediently done with a close-meshed wire mesh, which is attached at a distance of approx. 10 mm above the original and is slightly flexible.
  • the hose is then attached in a snake-shaped manner distributed over the wire mesh and led outward at one end through the mold frame or through the mold. No wire mesh is required when using perforated glass fiber mats.
  • the molding compound is poured into the prepared molding box.
  • an upper or lower box or multi-part molds can be produced.
  • the molding compounds (negative molds) are immediately lifted from the original after solidification and connected to the compressed air line to remove the water.
  • the water is squeezed out before in some cases with a pressure increase of 0.01 bar per minute until a pressure of approximately 1.2 bar is reached. To completely remove the water, this pressure is maintained for a period of about 10 to 20 minutes. In most cases, 10 to 20 minutes is enough.
  • the pore space formed by the water squeezing is essential for the subsequent metal casting.
  • the negative molds can be calcined immediately or after being stored in air at a temperature of at least 250 ° C. The calcination is necessary so that a sufficient vacuum performance can be achieved in the subsequent metal casting.
  • the vacuum lines are connected to the compressed air nozzle (s). This can be done using a direct-working vacuum pump with sufficient performance, as well as using a pre-evacuated vessel.
  • the negative mold is evacuated and the melt is poured in immediately.
  • the maximum amount of gas is 4 1 / qdm mold surface.
  • the rear wall thickness of the mold is greater than the distance between the hose and the work surface. In most cases a double to three times the wall thickness is sufficient.
  • a fitting plastic original (model), size approx. 20 x 10 x 8 cm, was coated with a wafer-thin oil film as a release agent and placed in a mold box with the internal dimensions 24 x 14 x 11 cm.
  • An easily deformable wire mesh with a mesh size of approx. 2-3 cm was adapted to this original surface.
  • a porous fabric tube of 8 mm diameter was connected to the wire mesh with a lateral distance of about 2 cm, the tube end was connected to the pipe socket attached to the molding box and the drainage device was fixed about 1 cm above the model.
  • the mold box with the negative model was calcined at 250 ° C.
  • Example 1 a perforated mineral wool fiber mat with a thickness of 2 cm was used.
  • the hole diameter was 1.5 cm, the distance from hole to hole was 2-3 cm.
  • the molding box was filled with the casting compound about 1 cm above the original and then the mineral wool fiber mat was fixed at a distance of about 1 cm above the original surface and then the molding box was filled up. Breaking out, evacuation and metal casting were carried out as in Example 1.
  • the model 7 lying in the box half 1a) is surrounded by the wire mesh fabric 6 on which the porous fabric tube 2 is arranged in a serpentine fashion.
  • the compressed gas is introduced through the nozzle at 4 and the vacuum is drawn off through the same nozzle.
  • the molding compound is indicated with the number 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)
EP84104214A 1983-05-06 1984-04-13 Procédé de fabrication de coulées de précision Expired - Lifetime EP0125510B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84104214T ATE54080T1 (de) 1983-05-06 1984-04-13 Verfahren zur herstellung von praezisionsguessen.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3316571 1983-05-06
DE3316571A DE3316571C2 (de) 1983-05-06 1983-05-06 Verfahren zur Herstellung von Präzisionsgießformen nach dem Gips - Formverfahren, Gießform und deren Verwendung
DE3320309A DE3320309C2 (de) 1983-06-04 1983-06-04 Verfahren zur Herstellung von Präzisionsmeßformen, Gießformen und deren Verwendung
DE3320309 1983-06-04

Publications (3)

Publication Number Publication Date
EP0125510A2 true EP0125510A2 (fr) 1984-11-21
EP0125510A3 EP0125510A3 (en) 1988-03-23
EP0125510B1 EP0125510B1 (fr) 1990-06-27

Family

ID=25810592

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84104214A Expired - Lifetime EP0125510B1 (fr) 1983-05-06 1984-04-13 Procédé de fabrication de coulées de précision

Country Status (2)

Country Link
EP (1) EP0125510B1 (fr)
DE (1) DE3482573D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2682624A1 (fr) * 1991-10-16 1993-04-23 Jelenko Co Jf Dispositif et procede pour la coulee de metaux.
CN114309491A (zh) * 2021-12-29 2022-04-12 大连船用推进器有限公司 便于观察大型螺旋桨桨叶烘型状态的型腔结构及方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE564615A (fr) *
US2882569A (en) * 1957-03-29 1959-04-21 Ram Inc Method and apparatus for molding and hardening articles
US3651855A (en) * 1968-02-23 1972-03-28 Henri Jean Daussan Continuous slurry supply method for fabrication of mold linings
US3825058A (en) * 1972-04-15 1974-07-23 Sintokogio Ltd Mold prepared by vacuum sealed molding process
US3923525A (en) * 1973-04-17 1975-12-02 Ashland Oil Inc Foundry compositions

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE564615A (fr) *
US2882569A (en) * 1957-03-29 1959-04-21 Ram Inc Method and apparatus for molding and hardening articles
US3651855A (en) * 1968-02-23 1972-03-28 Henri Jean Daussan Continuous slurry supply method for fabrication of mold linings
US3825058A (en) * 1972-04-15 1974-07-23 Sintokogio Ltd Mold prepared by vacuum sealed molding process
US3923525A (en) * 1973-04-17 1975-12-02 Ashland Oil Inc Foundry compositions

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2682624A1 (fr) * 1991-10-16 1993-04-23 Jelenko Co Jf Dispositif et procede pour la coulee de metaux.
US5392842A (en) * 1991-10-16 1995-02-28 J.F. Jelenko & Co. Casting metals
CN114309491A (zh) * 2021-12-29 2022-04-12 大连船用推进器有限公司 便于观察大型螺旋桨桨叶烘型状态的型腔结构及方法
CN114309491B (zh) * 2021-12-29 2023-11-14 大连船用推进器有限公司 便于观察大型螺旋桨桨叶烘型状态的型腔结构及方法

Also Published As

Publication number Publication date
EP0125510A3 (en) 1988-03-23
DE3482573D1 (de) 1990-08-02
EP0125510B1 (fr) 1990-06-27

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