CN104353790A - Preparation method of closed spatial curved surface structure casting core - Google Patents
Preparation method of closed spatial curved surface structure casting core Download PDFInfo
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- CN104353790A CN104353790A CN201410635563.8A CN201410635563A CN104353790A CN 104353790 A CN104353790 A CN 104353790A CN 201410635563 A CN201410635563 A CN 201410635563A CN 104353790 A CN104353790 A CN 104353790A
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- curved surface
- core
- space curved
- water
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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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention provides a preparation method of a closed spatial curved surface structure casting core. A spatial curved surface structure prepared from a water-soluble material is embedded into self-hardening sand; the spatial curved surface structure is dissolved with water after the self-hardening sand is solidified, so that a spatial curved surface structure inner cavity meeting the curved surface requirements can be obtained. Urea is optimized as the water-soluble material; compared with table salt as the water-soluble material, the advantages that the urea is high in solubility, low in melting point, and high in strength after being solidified are mainly utilized; furan resin sand is optimized as the self-hardening sand; and compared with urea-formaldehyde resin sand, the characteristics that the furan resin sand is better than the urea-formaldehyde resin sand in high temperature resistance in the baking process and does not scatter are mainly utilized.
Description
Technical field
The present invention relates to the fabricating technology field of core for cast, be specially a kind of preparation method of closed type space curved surface structural casting core.
Background technology
Closed type space curved surface structural casting, as having the open and close type hydraulics impeller of complex rotation curved surface, its space curved surface structure is has the blade that manifold is reversed in space, and blade is in the middle of two interlayers of impeller, therefore, when casting open and close type hydraulics impeller, core must be adopted.And the cavity curve form of core determines the space curved surface shape of foundry goods of casting and obtaining, therefore how preparing the core that cavity curve form meets the demands is the problem that first casting closed type space curved surface structural casting will solve.
At present, the technique of traditional preparation closed type space curved surface structural casting core is: the space curved surface structure (blade as open and close type hydraulics impeller) first processing independently metal quality, be fixed in during coremaking on core box, then thermosetting sand (as oil-sand) is used to fill consolidation, again by space curved surface connection loosing, rely on the creep of oil-sand to make a concession and take out space curved surface structure, the cavity distortion formed on core is like this serious, shape and real space curved-surface structure model difference larger.In addition oil-sand has to pass through and toasts and could solidify, baking must be held with core holder, technological equipment is complicated, and all cause core internal cavity change in shape to increase the weight of further with vibrations during carrying under gravity, the space curved surface shape of the closed type space curved surface structural casting in this way produced differs comparatively large with the curve form of actual design, corresponding closed type space curved surface structural casting does not just reach the Expected Results of design yet.
Summary of the invention
The present invention is preparing in core process for solving closed type space curved surface structural casting, the distortion of core internal cavity is serious, with the incongruent problem of space curved surface designing requirement of closed type space curved surface structural casting, propose a kind of preparation method of closed type space curved surface structural casting core, by space curved surface structure prepared by water-soluble material pre-buried in self-hardening property sand, with water, space curved surface structure is dissolved after the solidification of self-hardening property sand, and make formed core cavity curved surface meet the designing requirement of space curved surface structure completely.
Technical scheme of the present invention is:
The preparation method of described a kind of closed type space curved surface structural casting core, is characterized in that: adopt following steps:
Step 1: prepare independently space curved surface structure mold and core body core box;
Step 2: will pour in space curved surface structure mold after water-soluble material heating and melting, cooling makes water-soluble material solidify rear die sinking to take out and repair, obtaining space curved surface structure prepared by water-soluble material;
Step 3: according to the structural requirement of closed type space curved surface structural casting, by several, independently space curved surface structure is fixing on core body core box female die;
Step 4: self-hardening property sand is inserted main body core box and consolidation, after the sclerosis of self-hardening property sand, opens core main core box, takes out core;
Step 5: by the water-soluble solution of the water-soluble material in core, then by core baking, obtains closed type space curved surface structural casting core.
Further preferred version, the preparation method of described a kind of closed type space curved surface structural casting core, is characterized in that: water-soluble material adopts urea.
Further preferred version, the preparation method of described a kind of closed type space curved surface structural casting core, is characterized in that: self-hardening property sand adopts furan resin-sand.
Beneficial effect
The invention has the beneficial effects as follows:
The space curved surface structure that the present invention is prepared by water-soluble material pre-buried in self-hardening property sand, dissolves space curved surface structure with water, can obtain the space curved surface structure inner chamber meeting curved surface requirement after the solidification of self-hardening property sand.Adopt urea as water-soluble material in a preferred approach, compared to employing salt as water-soluble material, mainly utilize that urea solubility is high, fusing point is low and after solidifying, have the advantage of intensity.Adopt furan resin-sand as self-hardening property sand in a preferred approach, compared to Lauxite sand, mainly utilize furan resin-sand resistance to elevated temperatures in bake process better than Lauxite sand, feature that can not be defeated and dispersed.
Accompanying drawing explanation
Fig. 1: core body core box schematic diagram, wherein (a) is core body core box female die, and (b) is core body core box upper mold section.
Fig. 2: urea blade schematic diagram.
Fig. 3: urea blade is fixed on the schematic diagram on core body core box female die.
Fig. 4: the schematic diagram after core body of closing core box.
Fig. 5: core body core box fills the schematic diagram after furan resin-sand.
Fig. 6: the core schematic diagram before water-soluble.Wherein (a) is front, and (b) is the back side.
Fig. 7: the core schematic diagram after water-soluble.Wherein (a) is front, and (b) is the back side.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described:
Closed type space curved surface structural casting in the present embodiment is open and close type hydraulics impeller, and its space curved surface structure is blade, and the core preparation method of employing comprises the following steps:
Step 1: prepare independently blade mold (for the preparation of urea blade) and core body core box (for the preparation of resin sand core).Core body core box as shown in Figure 1.
Step 2: by Urea to 150--160 DEG C, pours into after urea melts completely in blade mold, cools 30-60 second, makes urea solidify rear die sinking and takes out urea blade, and repair, obtain the urea blade meeting curve form requirement.As shown in Figure 2.
Six urea blades are fixed by step 3: according to the structural requirement of open and close type hydraulics impeller on main body core box female die, as shown in Figure 3, then cover core body core box upper mold section, as shown in Figure 4.
Step 4: self-hardening furan resin-sand is inserted main body core box and consolidation, as shown in Figure 5.After furan resin-sand sclerosis (20-30 minute), open core main core box, take out core, core as shown in Figure 6.
Step 5: treat that core solidifies completely, puts into 35-40 DEG C of warm water 2-3 minute, urea is dissolved by core; The core dissolving urea blade is put into baking oven, and 180--200 DEG C of baking 2-3 hour, by core baking, obtains closed type space curved surface structural casting core, as shown in Figure 7.
Claims (3)
1. a preparation method for closed type space curved surface structural casting core, is characterized in that: adopt following steps:
Step 1: prepare independently space curved surface structure mold and core body core box;
Step 2: will pour in space curved surface structure mold after water-soluble material heating and melting, cooling makes water-soluble material solidify rear die sinking to take out and repair, obtaining space curved surface structure prepared by water-soluble material;
Step 3: according to the structural requirement of closed type space curved surface structural casting, by several, independently space curved surface structure is fixing on core body core box female die;
Step 4: self-hardening property sand is inserted main body core box and consolidation, after the sclerosis of self-hardening property sand, opens core main core box, takes out core;
Step 5: by the water-soluble solution of the water-soluble material in core, then by core baking, obtains closed type space curved surface structural casting core.
2. the preparation method of a kind of closed type space curved surface structural casting core according to claim 1, is characterized in that: water-soluble material adopts urea.
3. the preparation method of a kind of closed type space curved surface structural casting core according to claim 1, is characterized in that: self-hardening property sand adopts furan resin-sand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410635563.8A CN104353790B (en) | 2014-11-12 | 2014-11-12 | The preparation method of closed type space curved surface structural casting core |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410635563.8A CN104353790B (en) | 2014-11-12 | 2014-11-12 | The preparation method of closed type space curved surface structural casting core |
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| Publication Number | Publication Date |
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| CN104353790A true CN104353790A (en) | 2015-02-18 |
| CN104353790B CN104353790B (en) | 2016-06-29 |
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| CN201410635563.8A Active CN104353790B (en) | 2014-11-12 | 2014-11-12 | The preparation method of closed type space curved surface structural casting core |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105598384A (en) * | 2016-01-29 | 2016-05-25 | 刘士超 | Precoated sand casting method for submerged pump impeller |
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| JPS63144841A (en) * | 1986-12-09 | 1988-06-17 | Mitsubishi Metal Corp | Production of ceramics mold for precision casting |
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2014
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| GB1055737A (en) * | 1964-03-25 | 1967-01-18 | Wellworthy Ltd | Improvements in casting processes |
| JPS63144841A (en) * | 1986-12-09 | 1988-06-17 | Mitsubishi Metal Corp | Production of ceramics mold for precision casting |
| CN1792498A (en) * | 2005-11-29 | 2006-06-28 | 辽宁省轻工科学研究院 | Methd for preparing core of hollow ceramic |
| CN101607301A (en) * | 2008-06-18 | 2009-12-23 | 中国科学院金属研究所 | A kind of soluble core and preparation method thereof |
| CN103157763A (en) * | 2011-12-16 | 2013-06-19 | 洛阳奇润电力科技有限公司 | Application method of urea core and ceramic core |
| CN104028699A (en) * | 2014-04-28 | 2014-09-10 | 沈阳明禾石英制品有限责任公司 | Preparation method for guide vane inner ring split combined type hollow ceramic mold core |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105598384A (en) * | 2016-01-29 | 2016-05-25 | 刘士超 | Precoated sand casting method for submerged pump impeller |
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| CN104353790B (en) | 2016-06-29 |
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