EP2059356A1 - Single-part expendable casting mould with a controlled temperature for cast metal parts and associated production method - Google Patents
Single-part expendable casting mould with a controlled temperature for cast metal parts and associated production methodInfo
- Publication number
- EP2059356A1 EP2059356A1 EP07817442A EP07817442A EP2059356A1 EP 2059356 A1 EP2059356 A1 EP 2059356A1 EP 07817442 A EP07817442 A EP 07817442A EP 07817442 A EP07817442 A EP 07817442A EP 2059356 A1 EP2059356 A1 EP 2059356A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mold
- metal
- casting
- model
- lost
- 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
-
- 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
-
- 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
-
- 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
- the invention relates to a one-piece lost mold for castings made of metal and a method for their preparation.
- a preferred application of one-piece lost molds for metal castings is the rapid and economical production of single castings or castings in small numbers, most of which are used as so-called prototypes.
- Such prototype castings are used to verify the properties, eg. As the strength of more complex workpieces, which are standard z. B. to be produced by pressure or Kokilleng imagine compiler before making the permanent metal molds for mass production.
- they In order to be able to realistically evaluate the prototype castings, they must correspond in their material properties to the later series product or come as close as possible.
- Gypsum and ceramic molds are usually made using fusible wax models, sand molds using, for example, burnable or gasifiable foam polystyrene or plastic models. Due to the poor heat conduction of such molds made of gypsum, ceramic or foundry sand, the solidification times for the molten metal are relatively long, at least for larger wall thicknesses. Due to the slow solidification and cooling, depending on the metal to be cast, a relatively coarse-grained and therefore not always sufficiently load-bearing structure is often produced.
- No. 4,579,166 describes the use of the plaster casting technique for testing new machine components which otherwise could only be produced by pressure or chill casting.
- the casting of such components by means of plaster casting technique is indeed well suited for the production of prototypes made of aluminum, zinc, magnesium and their alloys.
- the prototypes produced therewith correspond only in their outer shape produced in a mold or die casting, and the casting of such parts of magnesium or its alloys without inert gas and without cooling is difficult.
- the provision of a more or less porous plaster mold is recommended, which contains only a small amount of unbound and bound water after calcination.
- the casting mold is protected from melt reactions by flooding the mold cavity with a protective gas.
- This shielding gas contains sulfur or sulfur hexafluride (SF 6 ) as inhibiting agents.
- SF 6 sulfur or sulfur hexafluride
- a thermocouple is placed in the mold near the casting and the temperature monitored during the cooling of the casting to detect uncontrolled reactions in the mold in time and, for. B. to prevent impending explosions. An active control of the cooling to achieve a finer structure is not possible with such a shape.
- a seeding sheet is additionally used for directional solidification of the melt. This is done by the casting mold for directional solidification of the melt has a immersed in the cooling bath metallic bottom plate. Due to the faster cooling on the metallic base plate, crystallization nuclei are formed in the melt, from which the melt solidifies. In the case of metal floor slabs, however, the melting of the melt must be expected. For this reason, already described with a coolant bottom plates have been described. To protect the melt from contamination by going into solution material of the bottom plate, an intermediate plate made of a same material to the solidifying melt material was additionally provided. Although this solution can largely avoid casting defects, however, a targeted influencing of the microstructure of the casting is also not possible here.
- Chilled plaster molds are described in Japanese Patent Laid-Open Nos. 63168250A1 and 02187236A1.
- a closure plate made of a plastic, which is burned out during curing of the plaster mold.
- a cooling plate is used during casting in order to achieve local cooling of the casting mold.
- JP 02187236 Al a cooler is also used in a plaster mold.
- a wax model consisting of a product part and a rotor part is inserted into an iron frame.
- a pattern material having the same shape as the radiator is placed on the part in which the cooling speed in the product part is to be accelerated.
- the plaster is filled in the space under the pattern material and the wax pattern as well as in the frame.
- the present invention is therefore based on the object of developing a casting mold for castings made of metal for the production of single castings or castings in small quantities, in which after the casting of the molten metal, the solidification to a cast body in terms of direction and speed of solidification using a coolant controlled can be. It is a further object of the present invention to develop a simple and inexpensive method for producing such a casting mold. According to the invention the object is achieved with respect to the mold with the features of claim 1 and with respect to the method for producing the mold with the features of claim 7. Advantageous embodiments of the invention will become apparent from the dependent claims.
- FIG. 1 shows a pattern or a master model for a casting to be produced
- FIG. 2 shows a silicone mold for casting out a lost model
- FIG. 3 shows a side view of a lost model produced in the silicone mold according to FIG. 2 and sheathed with a cooling channel;
- FIG. 4 is a sectional view of a casting mold produced by using the lost model encased in the cooling duct according to FIG. 3;
- FIG. 5 shows a casting produced by the casting mold according to FIG. 4 after its casting
- the pattern or master model 1 shown schematically in FIG. 1 provides the exact shape of a casting 2 to be produced with a casting mold according to the invention for metal castings 4, which is shown in FIG. If a pattern 1 is not already available, a so-called master model 1 must first be produced.
- the production of such a basic model 1 is usually carried out by means of stereolithography.
- Other suitable methods are for. These include Selective Laser Sintering, Fused Deposition Modeling, Laminated Object Modeling and 3D Printing.
- a master model 1 has to be recreated, if only one casting 2 is to be made, it should immediately be manufactured as a lost model of fusible wax, a low melting model alloy, a burnable plastic, or a plastic foam suitable for making the mold of the invention. If a sample of the casting to be produced is present or if the master model 1 is not already a lost model, a lost model must first be produced from the existing pattern or master model 1 to produce the casting mold according to the invention. This is done by the pattern or master model 1 is encapsulated in a molding box with liquid silicone, as can be seen in Figure 2.
- the silicone mold 5 formed in this way is divided by cutting along a dividing plane 15, the pattern 1 is taken from the mold cavity formed and the silicone mold 5 is provided with a pouring and feeding system (not shown in detail). Thereafter, the silicone mold 5 is exactly assembled again in the mold box and z. B. poured with liquid wax (also not shown). After the solidification of the wax from the silicone mold a lost model 3 z. B. be removed from wax.
- the mold material for the one-piece lost casting mold for metal castings 2 may also include binder-containing mold base material (eg quartz sand).
- binder-containing mold base material eg quartz sand.
- one-piece sand molds especially lost models of foam polystyrene are particularly suitable, which by foaming in a foam mold or by mechanical processing, for. As milling, a foam polystyrene block are produced.
- the lost model 3 made in one way or another will be made of wax, plastic (eg foam polystyrene) or a low melting model alloy for the purpose of making the invention one-piece lost mold for castings made of metal 4 at least partially encased with a flexible cooling duct 6.
- plastic eg foam polystyrene
- a low melting model alloy for the purpose of making the invention one-piece lost mold for castings made of metal 4 at least partially encased with a flexible cooling duct 6.
- the selection of these critical areas can, for. B. done by simulation of the solidification processes (casting simulation) advantageous.
- the lost model After sheathing the lost model 3 with the cooling channel 6, the lost model is embedded in a solidifiable molding material by providing a casting and feeding system 12.
- the lost model 3 is a wax model and is used as a molding material plaster
- the wax model is melted after solidification of the plaster mold.
- the wax model is also melted after solidification of the molding material and then fired the ceramic form.
- the lost model is a polystyrene foam or a plastic model and if a molding material containing binder is used as molding material
- the one-piece lost mold for castings of metal 4 according to the invention, as shown in FIG. 4 is ready for use already after solidification of the binder-containing molding base material. The burnout or gasification of the lost model takes place in this case only during casting by the molten metal itself.
- the metallic cooling channel 6 a metal material is selected which is resistant to the molten metal.
- the metallic cooling channel 6 may be smooth-walled and have a round or oval cross-section.
- the cooling channel 6 can be made smooth-walled and bent by means of bending tools to the lost model 3 with contact to the surface.
- a flexible metal hose, a flexible metal corrugated pipe or a wound corrugated metal hose is used for the metallic cooling channel 6.
- steel or stainless steel has been proven.
- a flexible stainless steel corrugated hose can easily be wound around the lost model 3 with a small radius of curvature.
- Such stainless steel corrugated hoses are manufactured in the form of a corrugated pipe or wound as Stahlwellschlauch. When using such a corrugated tube unwanted deformations of the pipe cross-section and stresses of the cooling channel 6 in the arcuate sheathing of the lost model 3 can be avoided.
- the corrugation of the tube may have a wavy contour or a rectangular contour.
- Such contours allow the formation of narrow arches and create a relatively large cooling surface. At the same time they improve the heat exchange between the molten metal and the guided in the cooling channel 6 cooling medium.
- the ends of the at least one cooling channel 6 are provided with connecting flanges 7, 8, which are each connected to a cooling medium feed 9, not shown, and a cooling medium discharge 10.
- cooling media are gaseous and liquid substances such. As air or cooling water used.
- the quantity of heat supplied to the one-piece lost casting mold for metal castings 4 with the molten metal can not be released directly to the environment by convection and radiation, as in the case of a mold or a diecasting mold. Rather, according to the invention, the heat is intensively extracted via the cooling medium via the cooling channel 6 embedded in the molding material and exposed to the mold cavity or only slightly covered, in order to cool the solidifying casting 2 as quickly as possible.
- the cooling and heat transfer fluids can be used with which the one-piece lost mold for castings made of metal 4 can be tempered before pouring. If the cooling is started at the latest when pouring the melt into the casting mold for metal castings 4, the melting of the melt at the cooling channel 6 can be avoided.
- the mold materials used for the one-piece lost mold for castings made of metal 4 are poor heat conductors, via the uncovered and / or only slightly covered outer sides of the metallic cooling channel 6 to the mold cavity, the heat supplied with the molten metal through the existing heat gradient in the cooling channel 6 on the cooling medium be directed.
- suitable arrangement of the at least one cooling channel 6 in the one-piece lost casting mold for castings made of metal 4 also a directional solidification can be effected and thus the formation of casting defects such as voids and porosities can be counteracted.
- the casting 2 can be easily demolded after cooling.
- the cooling channel 6 can be easily removed from the casting 2 together with the mold material of the lost casting mold for metal castings 4.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006041627A DE102006041627A1 (en) | 2006-09-05 | 2006-09-05 | One-piece lost mold for metal castings and method of making same |
PCT/DE2007/001516 WO2008028455A1 (en) | 2006-09-05 | 2007-08-25 | Single-part expendable casting mould with a controlled temperature for cast metal parts and associated production method |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2059356A1 true EP2059356A1 (en) | 2009-05-20 |
EP2059356B1 EP2059356B1 (en) | 2010-04-28 |
Family
ID=38896698
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07817442A Not-in-force EP2059356B1 (en) | 2006-09-05 | 2007-08-25 | Single-part expendable casting mould with a controlled temperature for cast metal parts and associated production method |
Country Status (7)
Country | Link |
---|---|
US (1) | US20090133848A1 (en) |
EP (1) | EP2059356B1 (en) |
JP (1) | JP2010502443A (en) |
AT (1) | ATE465832T1 (en) |
CA (1) | CA2646675A1 (en) |
DE (2) | DE102006041627A1 (en) |
WO (1) | WO2008028455A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007023152A1 (en) * | 2007-05-16 | 2008-11-20 | Mtu Aero Engines Gmbh | Method for producing a casting, casting mold and casting produced therewith |
FR3004366B1 (en) * | 2013-04-10 | 2021-04-30 | Snecma | MONOCRISTALLINE FOUNDRY MOLD |
JP6955556B2 (en) * | 2016-09-30 | 2021-10-27 | サーモディクス,インコーポレイテッド | Therapeutic balloon system with contraction guide |
CN110893453B (en) * | 2019-12-02 | 2024-02-27 | 中北大学 | Gypsum type precision casting method and device for magnesium alloy castings |
CN112427606A (en) * | 2020-10-21 | 2021-03-02 | 德盛镁汽车部件(芜湖)有限公司 | Casting mould arranged on engine cylinder cover production line |
CN113600795B (en) * | 2021-06-30 | 2023-07-14 | 上海航天精密机械研究所 | Casting method for refining investment casting structure |
CN114012071B (en) * | 2021-09-26 | 2023-09-15 | 芜湖泓鹄材料技术有限公司 | Method for solving abnormal molding surface of automobile stamping die casting based on air cooling technology |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54138062A (en) * | 1978-04-19 | 1979-10-26 | Yamahito Kogure | Super hard resin production and apparatus therefor |
US4574451A (en) * | 1982-12-22 | 1986-03-11 | General Electric Company | Method for producing an article with a fluid passage |
US4579166A (en) * | 1984-04-10 | 1986-04-01 | Amax Inc. | Magnesium alloy casting in plaster molds |
-
2006
- 2006-09-05 DE DE102006041627A patent/DE102006041627A1/en not_active Withdrawn
-
2007
- 2007-08-25 US US12/083,401 patent/US20090133848A1/en not_active Abandoned
- 2007-08-25 AT AT07817442T patent/ATE465832T1/en active
- 2007-08-25 WO PCT/DE2007/001516 patent/WO2008028455A1/en active Application Filing
- 2007-08-25 CA CA002646675A patent/CA2646675A1/en not_active Abandoned
- 2007-08-25 JP JP2009525918A patent/JP2010502443A/en active Pending
- 2007-08-25 EP EP07817442A patent/EP2059356B1/en not_active Not-in-force
- 2007-08-25 DE DE502007003621T patent/DE502007003621D1/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2008028455A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE502007003621D1 (en) | 2010-06-10 |
EP2059356B1 (en) | 2010-04-28 |
WO2008028455A8 (en) | 2008-05-02 |
US20090133848A1 (en) | 2009-05-28 |
WO2008028455A1 (en) | 2008-03-13 |
DE102006041627A1 (en) | 2008-03-20 |
JP2010502443A (en) | 2010-01-28 |
ATE465832T1 (en) | 2010-05-15 |
CA2646675A1 (en) | 2008-03-13 |
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