CN103978156A - Method for controlling coagulation and cooling of investment castings - Google Patents

Method for controlling coagulation and cooling of investment castings Download PDF

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Publication number
CN103978156A
CN103978156A CN201410076842.5A CN201410076842A CN103978156A CN 103978156 A CN103978156 A CN 103978156A CN 201410076842 A CN201410076842 A CN 201410076842A CN 103978156 A CN103978156 A CN 103978156A
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cooling
casting
shell
heating
cast
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CN201410076842.5A
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CN103978156B (en
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吕志刚
郭馨
艾厚望
徐明洪
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Tsinghua University
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Tsinghua University
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Abstract

A method for controlling coagulation and cooling of investment castings comprises the steps: 1) preparing a multi-layer inner-mold shell on the surface of a wax mold forming a casting and a corresponding casting system, so as to reach presupposed strength; 2) sticking a heating/cooling-cavity wax mold for preparing a heating/cooling cavity and a corresponding casting channel to a part at the outside of the inner-mold shell, wherein the part is a position for changing coagulation and cooling of the casting, and continuing to prepare a multi-layer outer-mold shell at the outsides of the heating/cooling-cavity wax mold and the prepared inner-mold shell to obtain enough strength; 3) performing de-waxing and roasting on the mold shells, so as to obtain an integral mold shell comprising a casting casting system, a mold cavity, a heating/cooling cavity and other casting channels; and 4) after/before casting metal is casted, pouring a molten metal with a specific temperature and containing specific compositions into the heating/cooling cavity, so as to locally change the cooling speed of the casting. According to the method, the shape of the heating/cooling cavity can be designed according to metal difference and the shape of a casting, the method is high in reliability and simple in operation, and is capable of solving the problems of control difficulty during coagulation and cooling of investment castings.

Description

A kind of investment-casting of controlling solidifies and cooling method
Technical field
The present invention relates to investment-casting and solidify control field, be specifically related to a kind of investment-casting of controlling and solidify and cooling method.
Background technology
Investment-casting be specially adapted to manufacturing structure complexity, size accurately, high-melting-point alloy thin-section casting and the single-casting of any surface finish.But along with the day by day complicated of casting structure and the raising to casting quality requirement, foundry goods only moulding has been difficult to satisfy the demands, the solidification process of controlling foundry goods becomes the important topic of model casting.
The correlation report of the i of model casting solidification process control is at present also few.Because shell can be preheating to uniform temperature before cast, model casting can not add chill and change process of setting as sand casting in casting mold.Have research to use the solidification process of quenching change shell part, but the method is subject to air blowing speed, the many factors such as distance, air-blowing quantity of blowing affect, the poor repeatability of field conduct, is difficult to guarantee that each foundry goods reaches the cooling effect of expection.And some special cast environment, as vacuum environment, Centrifugal Environment etc., are difficult to use the method for quenching.
Summary of the invention
The problem existing in order to solve above-mentioned existing technique, the object of the present invention is to provide a kind of investment-casting of controlling to solidify and cooling method, has the advantages that control accuracy is high, reliability is high.
For reaching above object, the present invention adopts following technical scheme:
Control investment-casting and solidify and a cooling method, by making additional chamber at investment-casting privileged site, in additional chamber, pour into a mould and coolingly with molten metal, control solidifying of foundry goods and cooling procedure, specifically comprise the steps:
Step 1: shell 2 in forming the wax-pattern 1 surface preparation multilayer of foundry goods and corresponding running gate system, to reach default intensity;
Step 2: outside interior shell 2, need to change casting solidification and cooling part, bonding heating/cooling chamber wax-pattern 3 of using for the preparation of heating/cooling chamber and its cast passage, and prepare shell 4 outside multilayer at this heating/cooling chamber wax-pattern 3 with the outer continuation of interior shell 2, until reach enough intensity;
Step 3: the whole shell 5 that internally shell 2 and outer shell 4 form dewaxes and roasting, obtains the whole shell 5 with casting moulding system and die cavity 6 and heating/cooling chamber and its cast passage 7;
Step 4: before 8 cast of foundry goods molten metal, pour into a mould the cooling molten metal 9 of using in heating/cooling chamber and its cast passage 7, change shell temperature with part; Or in casting pouring or cooling procedure, in heating/cooling chamber and its cast passage 7, pouring into a mould the cooling molten metal 9 of using, t changes foundry goods cooling velocity with part.
The cast of using and cooler environment are atmospheric environment or vacuum environment.
Advantage of the present invention is as follows:
1) adopt the present invention really to control reliably the solidification process of foundry goods by smart R.The design of heating/cooling chamber has very high flexibility, by heat/cooling chamber of appropriate design, choose reasonable heating/cool metal, can realize the solidification process of various metals, various shape foundry goods and control.
2) the present invention is workable to the control of casting solidification cooling procedure, there is very high multiplicity and predictability, can significantly not increase difficulty and the manufacturing cycle of Shell Preparation process, can realize batch production, and the mode such as available numerical simulation obtains Expected Results.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of Shell Preparation of the present invention and dewaxing process.
Fig. 2 is that the present invention realizes the front local technical process schematic diagram that changes cooling condition of pouring cast part molten metal.
Fig. 3 is that the present invention realizes local technical process schematic diagram while changing cooling condition after pouring cast part molten metal.
The specific embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
Using and use sn-bi alloy as cool metal, the process of cast aluminum alloy investment-casting is example.
As shown in Figure 1, the two-layer surface layer of wax-pattern 1 surface preparation, one deck transition zone, one deck backing layer at foundry goods forms the interior shell 2 with preset strength;
Outside interior shell 2, need to change casting solidification and cooling part, with the bonding heating/cooling chamber wax-pattern 3 used for the preparation of heating/cooling chamber and its cast passage of liquid wax.In this heating/cooling chamber wax-pattern 3 and the outer continuation of interior shell 2, prepare four layers of backing layer and form the outer shell 4 with sufficient intensity;
The whole shell 5 that internally shell 2 and outer shell 4 form dewaxes, and roasting, obtains the whole shell 5 with casting moulding system and die cavity 6 and heating/cooling chamber and its running gate system 7;
As Fig. 2, before cast aluminum alloy, in the heating/cooling chamber that is preheated to the shell of 500 ℃ is poured into a mould passage 7 with it, pouring temperature is the sn-bi alloy of 200R ℃, with part, reduces shell temperature; In casting moulding system and die cavity 6, pouring temperature is the aluminium alloy of 700 ℃ again, clear shell after completely cooling, the sn-bi alloy coolant that obtains aluminium alloy castings and completely cut off out by type shell material with foundry goods.
Or as shown in Figure 3, in casting moulding system and die cavity 6, pouring temperature is the aluminium alloy of 700 ℃, in heating/cooling chamber and its cast passage 7, pouring temperature is the sn-bi alloy of 200 ℃ again, with part, reduce shell temperature, clear shell after completely cooling, the sn-bi alloy coolant that obtains aluminium alloy castings and completely cut off out by type shell material with foundry goods.

Claims (2)

1. control investment-casting and solidify and a cooling method, it is characterized in that: by making additional chamber at investment-casting privileged site, in additional chamber, pour into a mould and coolingly with molten metal, control solidifying of foundry goods and cooling procedure, specifically comprise the steps:
Step 1: shell (2) in forming wax-pattern (1) the surface preparation multilayer of foundry goods and corresponding running gate system, to reach default intensity;
Step 2: outside interior shell (2), need to change casting solidification and cooling part, bonding heating/cooling chamber wax-pattern (3) of using for the preparation of heating/cooling chamber and its cast passage, and outside this heating/cooling chamber wax-pattern (3) and interior shell (2), continue shell (4) outside preparation multilayer, until reach enough intensity;
Step 3: the whole shell (5) that internally shell (2) and outer shell (4) form dewaxes and roasting, obtains the whole shell (5) with casting moulding system and die cavity (6) and heating/cooling chamber and its cast passage (7);
Step 4: before foundry goods molten metal (8) cast, the cooling molten metal (9) of using of cast, changes shell temperature with part in heating/cooling chamber and its cast passage (7); Or in casting pouring or cooling procedure, in heating/cooling chamber and its cast passage (7), the cooling molten metal (9) of using of cast, changes foundry goods cooling velocity with part.
2. a kind of investment-casting of controlling according to claim 1 solidifies and cooling method, it is characterized in that: the cast of using and cooler environment are atmospheric environment or vacuum environment.
CN201410076842.5A 2014-03-04 2014-03-04 A kind of method controlling investment-casting solidification and cooling Active CN103978156B (en)

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CN103978156B CN103978156B (en) 2016-08-17

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104439067A (en) * 2014-10-09 2015-03-25 湖南先淘不锈钢卫浴有限公司 Shell making process for deep-hole part with core-shell integration
CN105170950A (en) * 2015-09-25 2015-12-23 无锡环宇精密铸造有限公司 Hydrocooling casting method for precision casting of fired mold
CN105750499A (en) * 2016-04-21 2016-07-13 清华大学 Method of utilizing conformal cold iron and forced convection to locally cool investment casting
CN105750494A (en) * 2016-03-04 2016-07-13 清华大学 Double-layer structure new casting mold
CN108907094A (en) * 2018-07-26 2018-11-30 安吉百福艺术品有限公司 A kind of copper three-dimensional pattern high-precision is poured with mould material, auxiliary material and its casting method
CN110899671A (en) * 2019-12-09 2020-03-24 马鞍山市黎明天工自动化设备有限公司 Casting solidification control method

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US4651799A (en) * 1986-01-30 1987-03-24 Hitchiner Manufacturing Co., Inc. Vented casting molds and process of making the same
JPH0542342A (en) * 1991-08-08 1993-02-23 Kobe Steel Ltd Ceramic shell mold
CN101406932A (en) * 2008-11-10 2009-04-15 泉州腾达精铸有限公司 Precision-investment casting method
CN101767193A (en) * 2009-12-25 2010-07-07 沈阳工业大学 Process method for eliminating loose of thick and large casting of high-temperature alloy
CN103071765A (en) * 2012-12-27 2013-05-01 清华大学 Partial air cooling method for precast aperture passage in investment casting shell
CN103192027A (en) * 2013-03-28 2013-07-10 清华大学 Partial cooling method of cold iron in investment casting

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4651799A (en) * 1986-01-30 1987-03-24 Hitchiner Manufacturing Co., Inc. Vented casting molds and process of making the same
JPH0542342A (en) * 1991-08-08 1993-02-23 Kobe Steel Ltd Ceramic shell mold
CN101406932A (en) * 2008-11-10 2009-04-15 泉州腾达精铸有限公司 Precision-investment casting method
CN101767193A (en) * 2009-12-25 2010-07-07 沈阳工业大学 Process method for eliminating loose of thick and large casting of high-temperature alloy
CN103071765A (en) * 2012-12-27 2013-05-01 清华大学 Partial air cooling method for precast aperture passage in investment casting shell
CN103192027A (en) * 2013-03-28 2013-07-10 清华大学 Partial cooling method of cold iron in investment casting

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104439067A (en) * 2014-10-09 2015-03-25 湖南先淘不锈钢卫浴有限公司 Shell making process for deep-hole part with core-shell integration
CN104439067B (en) * 2014-10-09 2017-08-29 湖南先淘不锈钢卫浴有限公司 Core shell unifies deep hole part process for making shell
CN105170950A (en) * 2015-09-25 2015-12-23 无锡环宇精密铸造有限公司 Hydrocooling casting method for precision casting of fired mold
CN105750494A (en) * 2016-03-04 2016-07-13 清华大学 Double-layer structure new casting mold
CN105750499A (en) * 2016-04-21 2016-07-13 清华大学 Method of utilizing conformal cold iron and forced convection to locally cool investment casting
CN105750499B (en) * 2016-04-21 2018-02-09 清华大学 A kind of method using profile-followed chill and forced convertion to investment-casting Local cooling
CN108907094A (en) * 2018-07-26 2018-11-30 安吉百福艺术品有限公司 A kind of copper three-dimensional pattern high-precision is poured with mould material, auxiliary material and its casting method
CN110899671A (en) * 2019-12-09 2020-03-24 马鞍山市黎明天工自动化设备有限公司 Casting solidification control method

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