CN110586874A - Manufacturing method of integral impeller sand core - Google Patents
Manufacturing method of integral impeller sand core Download PDFInfo
- Publication number
- CN110586874A CN110586874A CN201911032172.6A CN201911032172A CN110586874A CN 110586874 A CN110586874 A CN 110586874A CN 201911032172 A CN201911032172 A CN 201911032172A CN 110586874 A CN110586874 A CN 110586874A
- Authority
- CN
- China
- Prior art keywords
- sand
- core
- working surface
- blade
- integral impeller
- 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.)
- Pending
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/28—Moulds for peculiarly-shaped castings for wheels, rolls, or rollers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a method for manufacturing an integral impeller sand core, which comprises the following steps of firstly, obtaining a plurality of sand molds with blade working surfaces and back working surfaces by using a mold and a core shooter; then, coating the surface of the sand mold forming area with paint, igniting, drying and polishing to be smooth; then, a plurality of positioning blocks or grooves for connecting the sand mold are processed on the bottom surface of the core box in a numerical control manner, so that the sand mold and the core box are fixed in an inserting manner; injecting resin sand between the blade working surface sand mold and the back working surface sand mold of the adjacent blade in the core box, and obtaining an integral impeller sand core after the resin sand is solidified; and finally, carrying out surface flow coating on the rest forming areas of the integral impeller sand core except the blades by using zircon powder coating, and then igniting and drying the integral impeller sand core. The manufacturing method of the invention has the advantages of low manufacturing cost, low labor intensity, high precision of the obtained sand core and convenient operation.
Description
Technical Field
The invention relates to a manufacturing method of an integral impeller sand core, and belongs to the technical field of impeller casting processes.
Background
The circulating pump is a pump which can adapt to different process conditions, such as conveying acid and alkali two-phase flow media with certain solid content, and has a very wide application range. The pump flow and the head and the mass of the core impeller are not separable. Therefore, improving the casting quality of the impeller is important to the overall performance of the circulation pump.
In the production of the circulating pump impeller casting, because the blades of the impeller are thin and have large torsion resistance, if the blades of a manufactured sample are almost impossible to take out of sand, the traditional process mostly adopts combined core sand for manufacturing. In the prior art, the combined sand core, namely the whole sand core, is formed by splicing and combining a plurality of units. However, the thickness of the impeller blade produced by adopting the combined sand core is uneven, and the size precision is not high; the main reasons are: the size precision of the impeller is poor due to the fact that a splicing gap exists between adjacent core assemblies of the combined sand core, time and labor are wasted in splicing of the combined sand core, labor intensity of workers is high, human errors are prone to being caused, the precision of the combined sand core is low, the combination precision is lower along with the increase of the size of the impeller, and the size precision of the impeller obtained by the sand core is poor. The integral impeller sand core is produced by directly adopting the metal blades, so that the metal blades used in the production process are difficult to take out of the sand core, part of the metal blades taken out are damaged, the repair workload is large, and the size of the blades is difficult to ensure; if directly adopt the preparation of foaming blade, because the foaming blade material is softer, easy deformation, hardly stable fixed in the psammitolite, cause the impeller precision that the psammitolite production obtained to reduce, the blade surface is crude to influence the performance of pump.
Disclosure of Invention
The invention aims to solve the technical problems that the defects of the traditional combined sand core are overcome, the method for manufacturing the integral impeller sand core is low in cost, the labor intensity in the core manufacturing process is not high, the requirement on the skill level of personnel is not high, the obtained sand core is high in precision and convenient to operate, and the impeller manufactured by the sand core obtained by the method can obviously improve the dimensional precision of the impeller and improve the performance of the whole circulating pump.
The technical scheme adopted by the invention to solve the technical problem is as follows:
the invention discloses a manufacturing method of an integral impeller sand core, which comprises the following steps:
1) obtaining a plurality of sand molds with blade working surfaces and back working surfaces by using a mold and a core shooter;
2) and (3) coating surfaces of sand mold forming areas of the working surface and the back working surface of the blade by using zircon powder coating, igniting, drying and polishing the sand mold forming areas of the working surface and the back working surface of the impeller blade to be smooth.
3) Numerically controlling and processing a plurality of positioning blocks or grooves for connecting sand molds of the working surface and the back working surface of the blade on the bottom surface of the core box, inserting the sand molds of the working surface and the back working surface of the blade into the positioning blocks or grooves on the bottom surface of the core box for splicing and fixing, tightly attaching the sand molds of the working surface and the back working surface of the blade to the positioning grooves, and putting the welded core ribs;
4) injecting mixed resin sand between a blade working surface sand mold and a back working surface sand mold of an adjacent blade in a core box, completely embedding the sand molds of the blade working surface and the back working surface into the resin sand, finishing by using a scraper, and obtaining an integral impeller sand core after the resin sand is cured;
5) and (3) carrying out surface flow coating on the other forming areas of the integral impeller sand core except the blades by using zircon powder coating, and then igniting and drying the integral impeller sand core.
The sand mold dies of the working surface and the back working surface of the blade in the step 1) are manufactured according to a hydraulic model diagram of the impeller.
In the step 1), the sand molds of the working surface and the back working surface of the blade can be prepared by mixing zircon sand, chromite sand, silica sand, self-hardening resin, water glass and the like according to the material of the blade and then using a core shooter.
The method for brushing the coating on the sand mold forming area of the blade working surface and the back working surface in the step 2) can be flow coating and brush coating, and the brushed coating is preferably zircon powder coating.
The sand moulds of the working surface and the back working surface of the blade in the step 3) are provided with bases for being clamped with the positioning grooves or the blocks, and the shapes of the bases are matched with the shapes of the positioning grooves of the core box. The locating grooves are arc-shaped, the locating blocks are round tables with certain drawing inclination, and the locating grooves or the blocks are symmetrically distributed on the bottom surface of the core box by taking the axis of the core box as a symmetry axis.
And 3) welding the core frame by using a steel pipe, winding an air rope on the surface of the core frame before placing, and welding a lifting ring for lifting the sand core on the core frame, so that the core is conveniently placed and lifted.
Has the advantages that:
the invention reduces the cost of the die and simplifies the operation steps of workers in a casting plant. The sand mold of the working surface and the back working surface of the blade and the processing method of the positioning groove on the core box adopt numerical control processing, the numerical control processing has high processing speed compared with other processing methods, and the obtained mold and the positioning groove have higher precision. The sand moulds of the working surface and the back working surface of the blade are manufactured by a core shooter with high precision, the arc chamfers are all taken out by the mould, the human factors are few, the dimensional stability is good, the surface is smooth and clean, and the hydraulic compliance is high. The sand moulds of the working surface and the back working surface of the blade are manufactured separately, so that coating and flow mark cleaning are facilitated, the labor intensity of a molder is reduced, and the quality of a casting is improved. Before filling resin sand into a core box of the sand mold with the blade working surface and the back working surface, in order to accelerate sand filling speed, dry sand can be filled into the blade cavities of the sand molds of the blade working surface and the back working surface to assist sand filling, and the dry sand in the blade cavity can be poured out after the resin sand is solidified. And, presetting the core bone in the sand core can facilitate hoisting. And the core frame is provided with a plurality of hoisting rings for hoisting, and the hoisting rings are used for lowering the core after the resin sand is cured. The size of the casting obtained by the invention meets the requirement of a drawing, and the performance of the pump is ensured.
Drawings
FIG. 1 is a schematic structural diagram of a sand mold in the manufacturing method of the present invention;
FIG. 2 is a schematic structural diagram of a core box in the manufacturing method of the present invention;
FIG. 3 is a schematic diagram of a splicing structure of a sand mold and a core box in the manufacturing method of the present invention;
FIG. 4 is a schematic structural view after sand injection in the manufacturing method of the present invention;
in the figure, 1-working surface sand mould; 2-back working face sand molding; 3-a core box; 4-positioning blocks; 5-locating slot
Detailed Description
The invention is further described with reference to the following figures and examples.
Examples
The invention discloses a manufacturing method of an integral impeller sand core, which comprises the following steps:
1) obtaining a plurality of working face sand moulds 1 with blades and back working face sand moulds 2 by using a mould and a core shooter, wherein the structure of the moulds is shown in figure 1;
2) and (3) coating surfaces of sand mold forming areas of the working surface and the back working surface of the blade by using zircon powder coating, igniting, drying and polishing the sand mold forming areas of the working surface and the back working surface of the impeller blade to be smooth.
3) A plurality of positioning blocks 3 or positioning grooves 4 for connecting sand molds of the working surface and the back working surface of the blade are processed on the bottom surface of a core box 3 in a numerical control manner, and the structure of the core box is shown in figure 2; inserting sand molds of the working surface and the back working surface of the blade into a positioning block or a positioning groove on the bottom surface of a core box for splicing and fixing, wherein the sand molds of the working surface and the back working surface of the blade are tightly attached to the positioning groove and are placed into a welded core rod, and the splicing structure of the sand molds and the core box is shown in figure 3;
4) injecting mixed resin sand between the blade working surface sand mold and the back working surface sand mold of the adjacent blade in the core box, completely embedding the sand molds of the blade working surface and the back working surface into the resin sand, finishing by using a scraper, obtaining an integral impeller sand core after the resin sand is solidified, wherein the structure after sand injection is shown in figure 4;
5) and (3) carrying out surface flow coating on the other forming areas of the integral impeller sand core except the blades by using zircon powder coating, and then igniting and drying the integral impeller sand core.
The sand mold dies of the working surface and the back working surface of the blade in the step 1) are manufactured according to a hydraulic model diagram of the impeller.
In the step 1), the sand molds of the working surface and the back working surface of the blade can be prepared by mixing zircon sand, chromite sand, silica sand, self-hardening resin, water glass and the like according to the material of the blade and then using a core shooter.
The method for brushing the coating on the sand mold forming area of the blade working surface and the back working surface in the step 2) can be flow coating and brush coating, and the brushed coating is preferably zircon powder coating.
The sand moulds of the working surface and the back working surface of the blade in the step 3) are provided with bases for being clamped with the positioning grooves or the blocks, and the shapes of the bases are matched with the shapes of the positioning grooves of the core box. The locating grooves are arc-shaped, the locating blocks are round tables with certain drawing inclination, and the locating grooves or the blocks are symmetrically distributed on the bottom surface of the core box by taking the axis of the core box as a symmetry axis.
And 3) welding the core frame by using a steel pipe, winding an air rope on the surface of the core frame before placing, and welding a lifting ring for lifting the sand core on the core frame, so that the core is conveniently placed and lifted.
Claims (6)
1. A manufacturing method of an integral impeller sand core is characterized by comprising the following steps:
1) obtaining a plurality of sand molds with blade working surfaces and back working surfaces by using a mold and a core shooter;
2) coating surfaces of sand mold forming areas of the working surface and the back working surface of the blade with zircon powder coating, and then igniting, drying and polishing the sand mold forming areas of the working surface and the back working surface of the blade of the impeller to be smooth;
3) numerically controlling and processing a plurality of positioning blocks or grooves for connecting sand molds of the working surface and the back working surface of the blade on the bottom surface of the core box, inserting the sand molds of the working surface and the back working surface of the blade into the positioning blocks or grooves on the bottom surface of the core box for splicing and fixing, tightly attaching the sand molds of the working surface and the back working surface of the blade to the positioning grooves, and putting the welded core ribs;
4) injecting mixed resin sand between a blade working surface sand mold and a back working surface sand mold of an adjacent blade in a core box, completely embedding the sand molds of the blade working surface and the back working surface into the resin sand, finishing by using a scraper, and obtaining an integral impeller sand core after the resin sand is cured;
5) and (3) carrying out surface flow coating on the other forming areas of the integral impeller sand core except the blades by using zircon powder coating, and then igniting and drying the integral impeller sand core.
2. The method for making an integral impeller sand core as claimed in claim 1, wherein the method comprises the following steps: the sand mold dies of the working surface and the back working surface of the blade in the step 1) are manufactured according to a hydraulic model diagram of the impeller.
3. The method for making an integral impeller sand core as claimed in claim 1, wherein the method comprises the following steps: in the step 1), the sand molds of the working surface and the back working surface of the blade can be prepared by mixing zircon sand, chromite sand, silica sand, self-hardening resin, water glass and the like according to the material of the blade and then using a core shooter.
4. The method for making an integral impeller sand core as claimed in claim 1, wherein the method comprises the following steps: the method for brushing the coating on the sand mold forming area of the blade working surface and the back working surface in the step 2) can be flow coating and brush coating, and the brushed coating is preferably zircon powder coating.
5. The method for making an integral impeller sand core as claimed in claim 1, wherein the method comprises the following steps: the sand moulds of the blade working surface and the back working surface in the step 3) are provided with bases for being clamped with the positioning grooves or the blocks, and the shapes of the bases are matched with the shapes of the positioning grooves of the core box; the locating grooves are arc-shaped, the locating blocks are round tables with certain drawing inclination, and the locating grooves or the blocks are symmetrically distributed on the bottom surface of the core box by taking the axis of the core box as a symmetry axis.
6. The method for making an integral impeller sand core as claimed in claim 1, wherein the method comprises the following steps: and 3) welding the core frame by using a steel pipe, winding an air rope on the surface of the core frame before placing, and welding a lifting ring for lifting the sand core on the core frame, so that the core is conveniently placed and lifted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911032172.6A CN110586874A (en) | 2019-10-28 | 2019-10-28 | Manufacturing method of integral impeller sand core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911032172.6A CN110586874A (en) | 2019-10-28 | 2019-10-28 | Manufacturing method of integral impeller sand core |
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| Publication Number | Publication Date |
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| CN110586874A true CN110586874A (en) | 2019-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911032172.6A Pending CN110586874A (en) | 2019-10-28 | 2019-10-28 | Manufacturing method of integral impeller sand core |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111644577A (en) * | 2020-06-12 | 2020-09-11 | 内蒙古第一机械集团股份有限公司 | Casting method for moving wheel and fixed wheel of comprehensive transmission system of tracked vehicle |
| CN114799049A (en) * | 2022-03-30 | 2022-07-29 | 西安航天发动机有限公司 | Processing die and method of sand core for variable cross-section blade casting of aerospace liquid engine |
| RU2777106C1 (en) * | 2021-08-12 | 2022-08-01 | Общество с ограниченной ответственностью "АЛЛИТ" | Casting mold for the production of casting with overflow channels |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111644577A (en) * | 2020-06-12 | 2020-09-11 | 内蒙古第一机械集团股份有限公司 | Casting method for moving wheel and fixed wheel of comprehensive transmission system of tracked vehicle |
| RU2777106C1 (en) * | 2021-08-12 | 2022-08-01 | Общество с ограниченной ответственностью "АЛЛИТ" | Casting mold for the production of casting with overflow channels |
| CN114799049A (en) * | 2022-03-30 | 2022-07-29 | 西安航天发动机有限公司 | Processing die and method of sand core for variable cross-section blade casting of aerospace liquid engine |
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Application publication date: 20191220 |