CN103962511A - Manufacturing method of integral impeller sand core - Google Patents
Manufacturing method of integral impeller sand core Download PDFInfo
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- CN103962511A CN103962511A CN201410218688.0A CN201410218688A CN103962511A CN 103962511 A CN103962511 A CN 103962511A CN 201410218688 A CN201410218688 A CN 201410218688A CN 103962511 A CN103962511 A CN 103962511A
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- core
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- waxed
- impeller
- core box
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Abstract
The invention provides a manufacturing method of an integral impeller sand core, belonging to the technical field of impeller casting techniques. The manufacturing method comprises the following steps: connecting multiple waxen blades with the bottom surface of a core box; then injecting sodium silicate-bonded sand into the core box; curing to obtain a sand core with the waxen blades; heating and roasting so as to melt and demold the waxen blades, thereby obtaining the integral impeller sand core. Before being connected with the core box, the waxen blades are wrapped with tin foils so as to prevent the surfaces of the waxen blades from being abraded by sodium silicate-bonded sand; when the waxen blades are molten and demolded by virtue of roasting, the tin foils can be taken out easily. The manufacturing method of the integral impeller sand core is low in cost; the obtained sand core is high in precision and is of an integral structure. By virtue of utilizing the sand core obtained by the manufacturing method to produce an impeller, the dimensional precision of the impeller can be obviously improved, and the overall performance of a desulfuration pump is improved.
Description
Technical field
A preparation method for Unitary Impeller core, belongs to impeller Casting Technology field.
Background technology
Desulfur pump belongs to cantilevered single stage single suction volute pump, is a kind of pump that can adapt to various different technology conditions.As transport acid, alkaline clear liquid or slip, the various olefin(e) acids of sulfuric acid industry, the various sewage of environmental protection industry (epi), range of application is very extensive.The quality interwoveness of two large performance parameter flows of desulfur pump and lift and its core component impeller.Therefore, the castability of raising impeller is greatly important to the overall performance of desulfur pump.Impeller had both referred to be equipped with the wheel disc of movable vane, was the part of impulse turbine rotor.The general name of finger wheel dish and the moving blade that is installed on it again.The production of desulfurized pump impeller foundry goods, traditional technique mostly adopts combination core sand casting, because the blade in impeller is according to its hydraulic model map analysis, blade is thinner, bend ratio is larger, is almost impossible if make that full pattern blade takes out from sand.Therefore, in prior art, adopt the method for combination core to make impeller, combination core is that whole core is combined by multiple unit spliceds.But applicant finds under study for action: the impeller size precision that adopts combination core to produce is poor; Applicant finds that by research the reason that produces this problem is: between the adjacent cells of combination core, exist the stitching position of splicing gap, unit to be difficult to entirely accurate, cause impeller size precision poor; And because the splicing of combining core in existing preparation method is wasted time and energy, labor strength is larger, easily causes human error, cause the core precision after combination low, adopt this core to obtain impeller size precision poor.Applicant finds under study for action: produce Unitary Impeller core as the blade of direct employing metal material, in production process, the blade of metal material used cannot take out from core; As direct employing foaming vane is made, because foaming vane material is softer, easily distortion, is difficult to stable fixing in core, and the impeller precision that causes core to produce acquisition reduces, and blade surface is coarse, thereby affects desulfurization pump performance.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the deficiencies in the prior art, a kind of preparation method of Unitary Impeller core is provided, the method method is with low cost, high and the integral formula structure of core precision obtaining, adopt the core that the method obtains to produce impeller, can significantly improve the dimensional accuracy of impeller, improve the performance of desulfur pump complete machine.
The technical solution adopted for the present invention to solve the technical problems is: the preparation method of this Unitary Impeller core, it is characterized in that, and comprise the steps:
A) use wax injector cast blade mold to obtain multiple waxed blades;
B) on the bottom surface of core box, digital control processing is multiple for connecting the locating slot of waxed blade, and the locating slot grafting of waxed blade being inserted to core box bottom surface is fixing, and blade and locating slot fit tightly, and put into the arbor having welded;
C) in core box, inject the water-glass sand through mixed system, waxed blade is imbedded in water-glass sand completely, in core box, pour CO
2gas solidifies water-glass sand, obtains the core that contains waxed blade;
D) core that contains waxed blade is taken out from core box, the core that baking contains waxed blade makes waxed blade melt from core, is down to room temperature, obtains Unitary Impeller core; Use zircon flour coating that surperficial flow coat is carried out in the blade forming region of Unitary Impeller core, then by the fire drying of Unitary Impeller core point.
Described waxed blade be provided with for the blade base of locating slot clamping, the shape of blade base and the shape of locating slot adapt.
Described locating slot camber, multiple locating slots are symmetrically distributed on the bottom surface of core box taking core box axle center as symmetry axis.
Waxed blade described in step b), before being connected with the bottom surface of core box, needs to use masking foil that the tow sides of waxed blade are wrapped up.
Core baking temperature described in step d) is 160 ~ 200 DEG C.
Blade mold described in step a) is made according to the hydraulic model figure of impeller.
Compared with prior art, the beneficial effect that the preparation method of Unitary Impeller core of the present invention has is: the present invention has reduced die cost, has simplified foundryman's operating procedure.The processing method of locating slot on core box adopts digital control processing, and other processing methods are compared in digital control processing, and to have process velocity fast, and the locating slot precision of acquisition is higher.During waxed blade is preferred, warm mould material is made, and is characterized in that contraction is less, good stability of the dimension, any surface finish.Waxed blade can use masking foil parcel before being connected with core box, to prevent that waxed blade surface is worn and torn by water-glass sand; Extremely waxed blade to be baked melts rear masking foil and can take out easily, has reduced moulder's labour intensity, has improved the quality of foundry goods.The core box of waxed blade is housed before inserting water-glass sand, in order to accelerate back-up sand speed, can in core box, be flexibly connected arbor and assists back-up sand.And preset arbor can be convenient to lifting in core.Arbor is provided with multiple for withholding of lifting, withhold for say glass sand solidify before by arbor from core box lifting taking-up.The size of the foundry goods that the present invention obtains has reached drawing requirement, has ensured pump performance.Detailed description of the invention in sum, impeller core by above-mentioned process modification after, greatly improved the dimensional accuracy of impeller.The even decile of blade, operator's labour intensity improves, and after impeller casting moulding, surface quality has also obtained very large improvement, thereby has improved the performance parameter of desulfur pump complete machine.
Brief description of the drawings
Fig. 1 is the top structure schematic diagram of waxed blade.
Fig. 2 is the polycrystalline substance schematic diagram of waxed blade.
Fig. 3 is the sectional structure schematic diagram of waxed blade.
Fig. 4 is the structural representation of core box.
Fig. 5 is the top view of core box.
Fig. 6 is the A-A face cutaway view of Fig. 5 core box.
Fig. 7 is the scheme of installation of core box and waxed blade.
Fig. 8 is the top view of Fig. 7 core box and waxed blade.
Fig. 9 is the B-B face cutaway view of Fig. 8.
Figure 10 is the scheme of installation of arbor, core box and waxed blade.
Figure 11 is the top view of Figure 10 arbor, core box and waxed blade.
Figure 12 is the C-C face cutaway view of Figure 11.
Figure 13 is the top surface structure schematic diagram of Unitary Impeller core.
Figure 14 is the bottom surface structure schematic diagram of Unitary Impeller core.
Figure 15 is the front view of Unitary Impeller core.
Figure 16 is the D-D face cutaway view of Figure 15.
Figure 17 is the upward view of Unitary Impeller core.
Figure 18 is the top view of Unitary Impeller core.
Wherein: 1, waxed blade; 101, blade base; 2, core box; 201, locating slot; 3, arbor; 4, withhold; 5, Unitary Impeller core; 6, blade forming region.
Detailed description of the invention
Fig. 1 ~ 18th, the most preferred embodiment of Unitary Impeller core of the present invention, below in conjunction with accompanying drawing 1 ~ 18, the present invention will be further described.
With reference to Fig. 4 ~ 9, the container that core box 2 is open top sealed bottom, it is tapered that the bottom surface of core box 2 raises up, and the bottom surface of core box 2 is provided with multiple for connecting the locating slot 201 of waxed blade 1.With reference to Fig. 1 ~ 3, waxed blade 1 be provided with for the blade base 101 of locating slot 201 clampings, the shape of the shape of blade base 101 and locating slot 201 adapts.With reference to Fig. 4 ~ 6, locating slot 201 cambers; In the two ends of locating slot 201 arcs: one end A/F is greater than other end A/F, one end that locating slot 201 A/Fs are larger is the insertion end of waxed blade 1.Multiple locating slots 201 are symmetrically distributed on the bottom surface of core box 2 taking core box 2 axle center as symmetry axis.With reference to Figure 13 ~ 18, on Unitary Impeller core 5, be distributed with Impeller Shaping region 6, blade forming region 6 is the waxed blade 1 before melting and the contact area of Unitary Impeller core 5.With reference to Figure 10 ~ 12, arbor 3 can be designed to multiple by welded wire metal concentric ring together, also can be designed to the wire of curl coiling.On arbor 3, add multiple withhold 4 so that lifting.
The present embodiment is made as follows:
A) use wax injector cast blade mold to obtain multiple waxed blades 1; Blade mold is made according to the hydraulic model figure of impeller;
B) by waxed blade 1 correcting process, need to use masking foil that the face with sand mold contact of waxed blade 1 is wrapped up, blade base 101 is without parcel; On the bottom surface of core box 2, digital control processing is multiple for connecting the locating slot 201 of waxed blade 1, and the locating slot 201 that waxed blade 1 is inserted to core box 2 bottom surfaces fits tightly, and puts into the arbor having welded; Preset arbor can be convenient to lifting;
C) to injecting the water-glass sand through mixed system in core box 2, waxed blade 1 is imbedded in water-glass sand completely, in injected water glass sand process, scraped off unnecessary sand to till moulding with scraper plate; In core box, pour CO
2gas solidifies water-glass sand, obtains the core that contains waxed blade;
D) core that contains waxed blade is taken out from core box 2, the core that baking contains waxed blade, baking temperature is 160 ~ 200 DEG C, makes waxed blade 1 melt from core; Baking finishes to be down to room temperature, extracts the masking foil in core out, makes to obtain Unitary Impeller core 5; Surperficial flow coat is carried out in the blade forming region of Unitary Impeller core 56 with zircon flour coating, then, by 5 fire dryings of Unitary Impeller core, to obtain final product.Blade forming region 6 is referring to Figure 13 ~ 18.
Comparative example 1
A) use wax injector cast blade mold to obtain multiple waxed blades 1; Blade mold is made according to the hydraulic model figure of impeller;
B) by waxed blade 1 correcting process, on the bottom surface of core box 2 digital control processing multiple for connecting the locating slot 201 of waxed blade 1, the locating slot 201 that waxed blade 1 is inserted to core box 2 bottom surfaces fits tightly, and puts into the arbor having welded;
C) to injecting the water-glass sand through mixed system in core box 2, waxed blade 1 is imbedded in water-glass sand completely, in injected water glass sand process, scraped off unnecessary sand to till moulding with scraper plate; In core box, pour CO
2gas solidifies water-glass sand, obtains the core that contains waxed blade; Can preset arbor 3 in core so that lifting;
D) core that contains waxed blade is taken out from core box 2, the core that baking contains waxed blade, baking temperature is 160 ~ 200 DEG C, makes waxed blade 1 melt from core; Baking finishes to be down to room temperature, obtains Unitary Impeller core 5.Surperficial flow coat is carried out in the blade forming region of Unitary Impeller core 56 with zircon flour coating, then, by 5 fire dryings of Unitary Impeller core, to obtain final product.
Comparative example 2
The present embodiment is made as follows:
A) use wax injector cast blade mold to obtain multiple waxed blades 1; Blade mold is made according to the hydraulic model figure of impeller;
B) by waxed blade 1 correcting process, need to use newspaper glue that the face with sand mold contact of waxed blade 1 is wrapped up, blade base 101 is without parcel; On the bottom surface of core box 2, digital control processing is multiple for connecting the locating slot 201 of waxed blade 1, and the locating slot 201 that waxed blade 1 is inserted to core box 2 bottom surfaces fits tightly, and puts into the arbor having welded;
C) to injecting the water-glass sand through mixed system in core box 2, waxed blade 1 is imbedded in water-glass sand completely, in injected water glass sand process, scraped off unnecessary sand to till moulding with scraper plate; In core box, pour CO
2gas solidifies water-glass sand, obtains the core that contains waxed blade; Can preset arbor 3 in core so that lifting;
D) core that contains waxed blade is taken out from core box 2, the core that baking contains waxed blade, baking temperature is 160 ~ 200 DEG C, makes waxed blade 1 melt from core; Baking finishes to be down to room temperature, obtains Unitary Impeller core 5.Surperficial flow coat is carried out in the blade forming region of Unitary Impeller core 56 with zircon flour coating, then, by 5 fire dryings of Unitary Impeller core, to obtain final product.
Comparative example 3
Make as follows:
A) to injecting the water-glass sand through mixed system in composite core formwork tool, add arbor, in injected water glass sand process, scrape off unnecessary sand to till moulding with scraper plate; In core box, pour CO
2gas solidifies water-glass sand, obtains five cores; Composite core formwork tool is made according to the hydraulic model figure of impeller;
B) by five core correcting process; Be grouped together in the plane and fix, surperficial flow coat being carried out in the blade forming region of Unitary Impeller core with zircon flour coating, then, by 5 fire dryings of Unitary Impeller core, to obtain final product.
Performance test
Adopt existing core to produce the method production of impeller embodiment and the final core obtaining of comparative example 1 ~ 3, and the impeller obtaining is tested.Concrete impeller production method is: embodiment and the final core obtaining of comparative example 1 ~ 3 are put in ready made casting mold, die joint position is coated with joint sealing cream, mo(u)ld top half (back shroud of impeller) and mo(u)ld bottom half (front shroud of impeller) mould assembling, casting molten steel, waits cooling rear acquisition impeller.
Method of testing: observe the rough and smooth situation on impeller outer surface by the method for range estimation, and by test result typing table 1.Blade surface roughness, measures the spacing between adjacent blades measurement point on impeller, and calculates the mean value of adjacent blades measurement point spacing; Utilize above data, the error typing table 1 of adjacent blades measurement point spacing, this error can be used for weighing the precision of impeller, and the less precision of error is higher.Check the surface roughness of impeller casting with roughmeter, can be used to weigh the precision of impeller; Roughness nominal value is less, and precision is larger.
Table 1 Unitary Impeller Core properties testing result
Can be found out by embodiment, the core that the mode that embodiment adopts masking foil to wrap up waxed blade obtains, the impeller surface obtaining is smooth, and precision is higher.Comparative example 1 does not adopt masking foil to wrap up waxed blade; Comparative example 2 adopts newspaper parcel blade; Comparative example 3 adopts combination core to produce impeller.Can find out by table 1, the impeller outer surface roughness nominal value of comparative example 1 ~ 3 is all greater than embodiment.Do not adopt masking foil to wrap up the comparative example 1 of waxed blade, its impeller outer surface roughness nominal value is obviously greater than the impeller outer surface roughness nominal value of the comparative example 2 that adopts newspaper parcel blade, reason is that in core manufacture process, water-glass sand and waxed blade rubbing cause, and illustrates that the present invention has practical significance to the parcel of blade.The impeller outer surface roughness nominal value of comparative example 2 is obviously greater than embodiment's, and applicant adopts masking foil parcel blade to compare other leaf packet package methods can obtain outstanding technique effect, and the use of masking foil has practical significance.The impeller outer surface roughness of comparative example 3 claims to be worth 100 um that 400um is obviously greater than embodiment, and the method that preparation method of the present invention is compared existing combination core and produced impeller is described, can obtain outstanding technique effect improving in impeller precision.Comparative example 3 estimates that blade is not uniform, combination core seam crossing burr is large, and for the uniform error of comparative example 3 blade in more accurate applicant's testing result is obviously greater than embodiment, can absolutely prove that the present invention produces the method for impeller compared to existing combination core, the uniform error of blade is little, precision is high, Leaf positional distribution is even, and without burr, technique effect is outstanding.
The above, be only preferred embodiment of the present invention, is not the restriction of the present invention being made to other form, and any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the equivalent embodiment of equivalent variations.But every technical solution of the present invention content that do not depart from, any simple modification, equivalent variations and the remodeling above embodiment done according to technical spirit of the present invention, still belong to the protection domain of technical solution of the present invention.
Claims (6)
1. a preparation method for Unitary Impeller core, is characterized in that, comprises the steps:
A) use wax injector cast blade mold to obtain multiple waxed blades (1);
B) on the bottom surface of core box (2), digital control processing is multiple for connecting the locating slot (201) of waxed blade (1), waxed blade (1) being inserted to the locating slot (201) of core box (2) bottom surface pegs graft fixing, blade (1) fits tightly with locating slot (201), and puts into the arbor (3) having welded;
C) in core box (2), inject the water-glass sand through mixed system, waxed blade (1) is imbedded in water-glass sand completely, in core box, pour CO
2gas solidifies water-glass sand, obtains the core that contains waxed blade;
D) core that contains waxed blade is taken out from core box (2), the core that baking contains waxed blade makes waxed blade (1) melt from core, is down to room temperature, obtains Unitary Impeller core (5); Use zircon flour coating that surperficial flow coat is carried out in the blade forming region of Unitary Impeller core (5), then by the fire drying of Unitary Impeller core (5) point.
2. the preparation method of Unitary Impeller core according to claim 1, it is characterized in that: described waxed blade (1) be provided with for and the blade base (101) of locating slot (201) clamping, the shape of the shape of blade base (101) and locating slot (201) adapts.
3. the preparation method of Unitary Impeller core according to claim 1, is characterized in that: described locating slot (201) camber, multiple locating slots (201) are symmetrically distributed on the bottom surface of core box (2) taking core box (2) axle center as symmetry axis.
4. the preparation method of Unitary Impeller core according to claim 1, is characterized in that: the waxed blade (1) described in step b), before being connected with the bottom surface of core box (2), needs to use masking foil that the tow sides of waxed blade (1) are wrapped up.
5. the preparation method of Unitary Impeller core according to claim 1, is characterized in that: the core baking temperature described in step d) is 160 ~ 200 DEG C.
6. the preparation method of Unitary Impeller core according to claim 1, is characterized in that: the blade mold described in step a) is made according to the hydraulic model figure of impeller.
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| CN201410218688.0A CN103962511B (en) | 2014-05-13 | 2014-05-13 | A kind of preparation method of Unitary Impeller core |
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Cited By (7)
| 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 |
| CN105750497A (en) * | 2016-04-22 | 2016-07-13 | 河北临泉泵业集团有限公司 | Submersible pump guide shell vane precoated sand mold and manufacture method thereof |
| CN105750508A (en) * | 2016-04-22 | 2016-07-13 | 河北临泉泵业集团有限公司 | Precoated sand submersible pump impeller vane sand mold and manufacture method thereof |
| CN107745095A (en) * | 2017-09-29 | 2018-03-02 | 中国航发北京航空材料研究院 | A kind of integral wheel resin sand and metal mold composite mould and preparation method |
| CN109773136A (en) * | 2019-03-14 | 2019-05-21 | 安徽应流集团霍山铸造有限公司 | A method of preventing the tiny runner sand core cracking of pump housing class casting |
| CN110586874A (en) * | 2019-10-28 | 2019-12-20 | 襄阳五二五泵业有限公司 | Manufacturing method of integral impeller sand core |
| CN111299512A (en) * | 2018-12-11 | 2020-06-19 | 无锡众鑫模具科技有限公司 | Water pump impeller casting and production process thereof |
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| CN103611875A (en) * | 2013-10-15 | 2014-03-05 | 湘潭新力机械有限公司 | Impeller air-lock valve impeller rotor production process |
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Cited By (8)
| 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 |
| CN105750497A (en) * | 2016-04-22 | 2016-07-13 | 河北临泉泵业集团有限公司 | Submersible pump guide shell vane precoated sand mold and manufacture method thereof |
| CN105750508A (en) * | 2016-04-22 | 2016-07-13 | 河北临泉泵业集团有限公司 | Precoated sand submersible pump impeller vane sand mold and manufacture method thereof |
| CN107745095A (en) * | 2017-09-29 | 2018-03-02 | 中国航发北京航空材料研究院 | A kind of integral wheel resin sand and metal mold composite mould and preparation method |
| CN111299512A (en) * | 2018-12-11 | 2020-06-19 | 无锡众鑫模具科技有限公司 | Water pump impeller casting and production process thereof |
| CN109773136A (en) * | 2019-03-14 | 2019-05-21 | 安徽应流集团霍山铸造有限公司 | A method of preventing the tiny runner sand core cracking of pump housing class casting |
| CN109773136B (en) * | 2019-03-14 | 2020-07-17 | 安徽应流集团霍山铸造有限公司 | Method for preventing small runner sand core of pump body type casting from cracking |
| CN110586874A (en) * | 2019-10-28 | 2019-12-20 | 襄阳五二五泵业有限公司 | Manufacturing method of integral impeller sand core |
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