CN109047670B - Salt core preparation method - Google Patents
Salt core preparation method Download PDFInfo
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- CN109047670B CN109047670B CN201810972314.6A CN201810972314A CN109047670B CN 109047670 B CN109047670 B CN 109047670B CN 201810972314 A CN201810972314 A CN 201810972314A CN 109047670 B CN109047670 B CN 109047670B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/105—Salt cores
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- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a preparation method of a salt core, which comprises the following steps: mixing the salt powder with a binder to prepare an injection feed; injecting the feed to form a salt core green embryo by an injection machine; and putting the salt core green blank into the buried powder, putting the salt core and the buried powder into a heat treatment furnace together, heating, degreasing and sintering to obtain the salt core. The salt core preparation method has low requirements on equipment and low manufacturing cost.
Description
Technical Field
The invention relates to a salt core preparation method, in particular to a salt core preparation method for pressure casting.
Background
In some precision castings such as automobile and aeroengine, the low pressure or normal pressure casting method, such as sand casting, gravity metal casting, low pressure casting and other widely used sand cores can meet the requirements of castings with complex inner cavities, which have extremely complex shapes and cannot be manufactured by machining or other similar forming methods. For high-pressure casting, the strength of the sand core is difficult to meet the requirement, the surface precision is low, the final sand cleaning work is time-consuming and labor-consuming, and the efficiency is low, so the water-soluble salt core technology can solve the problems.
The water-soluble salt core technology is characterized in that a core is made of water-soluble alkali metal salt, and after casting is finished, the core is flushed by high-temperature and high-pressure water flow, so that casting cleaning work is finished quickly.
The currently common method for preparing water-soluble salt cores is melt die casting. The melting and die-casting method is to heat and melt salt into liquid state, pour the liquid into a material cylinder of a die-casting machine, and die-cast and mold to obtain a salt core; the method can obtain the salt core with a complex shape, but has high requirements on equipment, needs two die casting machines and has higher cost.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a salt core preparation method which has low requirements on equipment and low manufacturing cost.
In order to achieve the above object, the present invention adopts the following scheme:
a preparation method of a salt core comprises the following steps: mixing the salt powder with a binder to prepare an injection feed; injecting the feed to form a salt core green embryo by an injection machine; and putting the salt core green blank into the buried powder, putting the salt core and the buried powder into a heat treatment furnace together, heating, degreasing and sintering to obtain the salt core.
Further, the salt core green bodies and the buried powder are heated, cooled to below 100 ℃ along with the heat treatment furnace and taken out.
Further, the highest temperature for heating the salt core green blank and the buried powder is more than 700 ℃ and less than 750 ℃.
Further, the binder includes paraffin, polyethylene glycol, stearic acid, and anhydrous borax.
Further, the weight ratio of the paraffin to the salt powder is more than or equal to 0.2 and less than or equal to 0.25;
the weight ratio of the polyethylene glycol to the salt powder is more than or equal to 0.12 and less than or equal to 0.15;
the weight ratio of the stearic acid to the salt powder is more than or equal to 0.02 and less than or equal to 0.04;
the weight ratio of the anhydrous borax to the salt powder is more than or equal to 0.04 and less than or equal to 0.06.
Further, the binder also includes magnesium oxide.
Further, the weight ratio of the magnesium oxide to the salt powder is not less than 0.03 and not more than 0.05.
Further, the particle size of the salt powder is less than 50 μm.
Further, the injection feed was pelletized.
Further, the heat treatment furnace is an air circulation heat treatment furnace.
The invention has the advantages of low requirement on equipment and low manufacturing cost. The salt powder is not required to be heated into liquid state for die-casting molding. Degreasing and sintering can be carried out in a heat treatment furnace, so that the process flow is simplified. Compared with the traditional powder injection molding process, the two heat treatment furnaces are needed for degreasing and sintering, and the cost is reduced.
Drawings
Fig. 1 is a flow chart of a preferred embodiment of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and the embodiments.
As shown in fig. 1, a method for preparing a salt core comprises the following steps: mixing the salt powder with a binder to prepare an injection feed; injecting the feed to form a salt core green embryo by an injection machine; and putting the salt core green blank into the buried powder, putting the salt core and the buried powder into a heat treatment furnace together, heating, degreasing and sintering to obtain the salt core.
Specifically, the heat treatment furnace is an air circulation heat treatment furnace; the embedded powder is a porous material; degreasing and sintering are completed in the same heat treatment furnace. Degreasing is used to remove the binder.
In a preferred embodiment, the highest temperature for heating the salt core green body and the buried powder is more than 700 ℃ and less than 750 ℃. In a preferred embodiment, the salt core green body and the buried powder are heated and then cooled to 100 ℃ or lower in the heat treatment furnace and taken out.
The specific temperature rise process is as follows: putting the salt core and the buried powder into a heat treatment furnace together at room temperature; heating to 60 deg.C and maintaining for 0.5-1 hr; continuously heating to 100 ℃ and maintaining for 0.5 to 1 hour; continuously heating to 140 ℃ and maintaining for 0.5 to 1 hour; continuously heating to 180 ℃ and maintaining for 0.5 to 1 hour; continuously heating to 220 ℃ and maintaining for 1-1.5 hours; continuously heating to 260 ℃ and maintaining for 1-1.5 hours; continuously heating to 300 ℃ and maintaining for 1-1.5 hours; continuously heating to 340 ℃, and maintaining for 1-1.5 hours; continuously heating to 380 ℃ and maintaining for 0.5 to 1 hour; continuously heating to 420 ℃ and maintaining for 0.5 to 1 hour; continuously heating to 460 ℃ and maintaining for 0.5-1 hour; continuously heating to 500 ℃ and maintaining for 0.5 to 1 hour; continuously heating to 540 ℃ and maintaining for 0.5 to 1 hour; continuously heating to 580 ℃ and maintaining for 0.5 to 1 hour; heating is continued to 730 ℃ and maintained for 1 to 1.5 hours.
In a preferred embodiment, the particle size of the salt powder is less than 50 μm. Specifically, the salt powder is sodium chloride powder.
As a preferred embodiment, the binder includes paraffin wax, polyethylene glycol, stearic acid, and anhydrous borax.
As a preferred embodiment, the binder further comprises magnesium oxide.
Specifically, selecting sodium chloride powder: 100 parts of (A); paraffin wax: 20 to 25 parts; polyethylene glycol: 12 to 15 parts; stearic acid: 2-4 parts; anhydrous borax: 4 to 6 parts; magnesium oxide: 3 to 5 portions.
The melting point of the paraffin wax used is 55-60 ℃. Polyethylene glycol is PEG-4000.
As a specific embodiment, the weight ratio of the paraffin wax to the salt powder is 0.2 or more and 0.25 or less; the weight ratio of the polyethylene glycol to the salt powder is more than or equal to 0.12 and less than or equal to 0.15; the weight ratio of the stearic acid to the salt powder is more than or equal to 0.02 and less than or equal to 0.04; the weight ratio of the anhydrous borax to the salt powder is more than or equal to 0.04 and less than or equal to 0.06. The weight ratio of the magnesium oxide to the salt powder is more than or equal to 0.03 and less than or equal to 0.05.
As a preferred embodiment, the injection feed is pelletized.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.
Claims (1)
1. A preparation method of a salt core is characterized by comprising the following steps:
mixing the salt powder with a binder to prepare an injection feed;
preparing the injection feed into a salt core green embryo by an injection machine;
putting the salt core green blank into buried powder, putting the salt core and the buried powder into a heat treatment furnace together, heating, degreasing and sintering to obtain a salt core;
heating the salt core green blank and the buried powder, cooling the salt core green blank and the buried powder to be below 100 ℃ along with the heat treatment furnace, and taking out the salt core green blank and the buried powder;
the highest temperature for heating the salt core green blank and the buried powder is more than 700 ℃ and less than 750 ℃;
the adhesive comprises: paraffin, polyethylene glycol, stearic acid and anhydrous borax;
the weight ratio of the paraffin to the salt powder is more than or equal to 0.2 and less than or equal to 0.25;
the weight ratio of the polyethylene glycol to the salt powder is more than or equal to 0.12 and less than or equal to 0.15;
the weight ratio of the stearic acid to the salt powder is more than or equal to 0.02 and less than or equal to 0.04;
the weight ratio of the anhydrous borax to the salt powder is more than or equal to 0.04 and less than or equal to 0.06;
the binder further comprises magnesium oxide;
the weight ratio of the magnesium oxide to the salt powder is more than or equal to 0.03 and less than or equal to 0.05;
the granularity of the salt powder is less than 50 mu m;
the injection feed is in a pellet shape;
the heat treatment furnace is an air circulation heat treatment furnace.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810972314.6A CN109047670B (en) | 2018-08-24 | 2018-08-24 | Salt core preparation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810972314.6A CN109047670B (en) | 2018-08-24 | 2018-08-24 | Salt core preparation method |
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| CN109047670A CN109047670A (en) | 2018-12-21 |
| CN109047670B true CN109047670B (en) | 2020-07-17 |
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| CN112775397B (en) * | 2020-12-25 | 2023-04-18 | 滨州市正道机械制造有限公司 | Salt core manufacturing process |
| CN115321826B (en) * | 2021-05-10 | 2024-04-12 | 中国科学院上海硅酸盐研究所 | Water-soluble glass ceramic-based core and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105798308A (en) * | 2016-03-29 | 2016-07-27 | 齐鲁工业大学 | Water-soluble salt core type metal powder injection molding technology |
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| WO2005058526A2 (en) * | 2003-12-17 | 2005-06-30 | Ks Aluminium-Technologie Ag | Removable core for casting metal and method for producing a core |
| CN102351542B (en) * | 2011-07-12 | 2012-12-05 | 中南大学 | Preparation method of hollow-structure metal or ceramic part |
| ES2628255T3 (en) * | 2013-10-19 | 2017-08-02 | Peak Deutschland Gmbh | Procedure to produce lost males or mold pieces for the production of castings. |
| CN103658545B (en) * | 2013-12-25 | 2015-11-18 | 山东滨州渤海活塞股份有限公司 | A kind of method of cross beam type salt core compacting tool set and manufacture salt core thereof |
| CN107900306A (en) * | 2017-11-03 | 2018-04-13 | 南京泉峰汽车精密技术股份有限公司 | Compression casting salt core preparation method |
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| CN105798308A (en) * | 2016-03-29 | 2016-07-27 | 齐鲁工业大学 | Water-soluble salt core type metal powder injection molding technology |
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