CN103962511B - A kind of preparation method of Unitary Impeller core - Google Patents

A kind of preparation method of Unitary Impeller core Download PDF

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CN103962511B
CN103962511B CN201410218688.0A CN201410218688A CN103962511B CN 103962511 B CN103962511 B CN 103962511B CN 201410218688 A CN201410218688 A CN 201410218688A CN 103962511 B CN103962511 B CN 103962511B
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blade
core
waxed
impeller
locating slot
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CN103962511A (en
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陈维茂
岳增庆
徐红伟
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ZIBO WATER RING VACUUM PUMP FACTORY CO Ltd
ZIBO HUACHENG PUMP CO Ltd
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ZIBO WATER RING VACUUM PUMP FACTORY CO Ltd
ZIBO HUACHENG PUMP CO Ltd
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Abstract

A preparation method for Unitary Impeller core, belongs to pump vane casting technology field.The present invention, by being connected with core box bottom surface by multiple waxed blade, then injects water-glass sand in core box, and solidification obtains the core containing waxed blade and makes waxed blade melt by the mode of heated baking, obtains Unitary Impeller core.Waxed blade can use masking foil to wrap up before being connected with core box, weares and teares by water-glass sand to prevent waxed blade surface; Extremely waxed blade fusing to be baked is deviate from rear masking foil and can be taken out easily.The preparation method of Unitary Impeller core of the present invention is with low cost, the high and integral formula structure of the core precision of acquisition.The core adopting the present invention to obtain produces impeller, can significantly improve the dimensional accuracy of impeller, improve the performance of desulfur pump complete machine.

Description

A kind of preparation method of Unitary Impeller core
Technical field
A preparation method for Unitary Impeller core, belongs to pump vane 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) acid of sulfuric acid industry, the various sewage of environmental protection industry (epi), range of application is very extensive.The quality of two large performance parameter flows of desulfur pump and lift and its core component impeller is inseparable.Therefore, the castability improving impeller is greatly important to the overall performance of desulfur pump.Impeller had both referred to the wheel disc that movable vane is housed, and was the part of impulse turbine rotor.Finger wheel dish and the general name of moving blade be installed on it again.The production of desulfurized pump impeller foundry goods, traditional technique mostly adopts the casting of combination core sand, because the blade in impeller is according to its hydraulic model map analysis, blade is thinner, and bend ratio is comparatively large, if it is almost impossible that making full pattern blade takes out from sand.Therefore, in prior art, adopt the method for combination core to make impeller, combination core and whole core are combined by multiple unit spliced.But applicant finds under study for action: the impeller size precision adopting combination core to produce is poor; By research, applicant finds that the reason producing this problem is: between the adjacent cells of combination core, the stitching position of existence splicing gap, unit is difficult to entirely accurate, causes impeller size precision poor; And because the splicing of combining core in existing preparation method is wasted time and energy, labor strength is comparatively large, easily causes human error, causes the core precision after combination low, adopts this core to obtain impeller size precision poor.Applicant finds under study for action: as directly adopted the blade of metal material to produce Unitary Impeller core, then the blade of metal material used in production process cannot take out from core; As directly adopted foaming vane to make, because foaming vane material is softer, be easily out of shape, be difficult to stable fixing in core, the impeller precision causing core to produce acquisition reduces, and blade surface is coarse, thus 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 obtained, the core adopting the method to obtain produces impeller, the dimensional accuracy of impeller can be significantly improved, 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, is characterized in that, comprises the steps:
A) wax injector cast blade mold is used to obtain multiple waxed blade;
B) the multiple locating slot for connecting waxed blade of digital control processing on the bottom surface of core box, the locating slot grafting that waxed blade inserts core box bottom surface fixed, blade and locating slot fit tightly, and put into the arbor 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, pours CO 2gas makes water-glass sand solidify, and obtains the core containing waxed blade;
D) taken out from core box by the core containing waxed blade, the core of baking containing waxed blade makes waxed blade melt from core, is down to room temperature, obtains Unitary Impeller core; Zircon flour coating is used surperficial flow coat to be carried out in the blade forming region of Unitary Impeller core, then by the fire drying of Unitary Impeller core point.
Described waxed blade is provided with for the blade base with locating slot clamping, and the shape of blade base and the shape of locating slot adapt.
Described locating slot camber, multiple locating slot with core box axle center for symmetry axis is symmetrically distributed on the bottom surface of core box.
Waxed blade described in step b), before being connected with the bottom surface of core box, need use masking foil to be wrapped up by the tow sides of waxed blade.
Core baking temperature described in step d) is 160 ~ 200 DEG C.
Blade mold described in step a) makes 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: present invention reduces die cost, simplify the operating procedure of foundryman.The processing method of locating slot on core box adopts digital control processing, and digital control processing is compared other processing methods and had process velocity soon, and the locating slot precision of acquisition is higher.During waxed blade is preferred, warm mould material makes, and is characterized in that contraction is less, good stability of the dimension, any surface finish.Waxed blade can use masking foil to wrap up before being connected with core box, weares and teares by water-glass sand to prevent waxed blade surface; Extremely waxed blade fusing to be baked is deviate from rear masking foil and can be taken out easily, reduces the labour intensity of moulder, improves the quality of foundry goods.The core box that waxed blade is housed, before inserting water-glass sand, in order to accelerate back-up sand speed, can be flexibly connected arbor and carrying out auxiliary back-up sand in core box.Further, in core, preset arbor can be convenient to lifting.Arbor is provided with multiple for withholding of lifting, and withholds for arbor being lifted taking-up from core box before saying glass sand solidification.The size of the foundry goods that the present invention obtains reaches drawing requirement, ensure that pump performance.In sum, impeller core, by after above-mentioned process modification, substantially increases the dimensional accuracy of impeller to detailed description of the invention.The even decile of blade, the labour intensity of operator improves, and after impeller casting is shaping, surface quality have also been obtained very large improvement, thus improves the performance parameter of desulfur pump complete machine.
Accompanying drawing explanation
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 sectional 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 sectional 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 sectional 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 sectional 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 ~ 18 are most preferred embodiments of Unitary Impeller core of the present invention, and below in conjunction with accompanying drawing 1 ~ 18, the present invention will be further described.
With reference to Fig. 4 ~ 9, core box 2 is the container of open top sealed bottom, and the bottom surface of core box 2 raises up tapered, and the bottom surface of core box 2 is provided with multiple locating slot 201 for connecting waxed blade 1.With reference to Fig. 1 ~ 3, waxed blade 1 is provided with for the blade base 101 with locating slot 201 clamping, and the shape of blade base 101 and the shape of locating slot 201 adapt.With reference to Fig. 4 ~ 6, locating slot 201 camber; In the two ends of locating slot 201 arc: one end open width is greater than other end A/F, one end that locating slot 201 A/F is larger is the insertion end of waxed blade 1.Multiple locating slot 201 with core box 2 axle center for symmetry axis is symmetrically distributed on the bottom surface of core box 2.With reference to Figure 13 ~ 18, Unitary Impeller core 5 is distributed with Impeller Shaping region 6, blade forming region 6 be the contact area of waxed blade 1 before fusing and 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.Arbor 3 adds multiple withhold 4 so that lifting.
The present embodiment makes as follows:
A) wax injector cast blade mold is used to obtain multiple waxed blade 1; Blade mold makes according to the hydraulic model figure of impeller;
B) by waxed blade 1 correcting process, masking foil need be used to be wrapped up in the face with sand mold contact of waxed blade 1, and blade base 101 is without the need to parcel; On the bottom surface of core box 2, the multiple locating slot 201 for connecting waxed blade 1 of digital control processing, fits tightly the locating slot 201 that waxed blade 1 inserts core box 2 bottom surface, puts into the arbor welded; Preset arbor can be convenient to lifting;
C) in core box 2, inject the water-glass sand through mixed system, waxed blade 1 is imbedded in water-glass sand completely, inject water-glass sand process scraper plate and scrape off unnecessary sand to shaping; CO is poured in core box 2gas makes water-glass sand solidify, and obtains the core containing waxed blade;
D) taken out from core box 2 by the core containing waxed blade, the core of baking containing waxed blade, baking temperature is 160 ~ 200 DEG C, makes waxed blade 1 melt from core; Room temperature is down in baking end, extracts the masking foil in core out, makes acquisition Unitary Impeller core 5; With zircon flour coating, surperficial flow coat is carried out in the blade forming region 6 of Unitary Impeller core 5, then by 5 fire dryings of Unitary Impeller core, to obtain final product.Blade forming region 6 is see Figure 13 ~ 18.
Comparative example 1
A) wax injector cast blade mold is used to obtain multiple waxed blade 1; Blade mold makes according to the hydraulic model figure of impeller;
B) by waxed blade 1 correcting process, on the bottom surface of core box 2, the multiple locating slot 201 for connecting waxed blade 1 of digital control processing, fits tightly the locating slot 201 that waxed blade 1 inserts core box 2 bottom surface, puts into the arbor welded;
C) in core box 2, inject the water-glass sand through mixed system, waxed blade 1 is imbedded in water-glass sand completely, inject water-glass sand process scraper plate and scrape off unnecessary sand to shaping; CO is poured in core box 2gas makes water-glass sand solidify, and obtains the core containing waxed blade; Install beforehand arbor 3 in core is so that lifting;
D) taken out from core box 2 by the core containing waxed blade, the core of baking containing waxed blade, baking temperature is 160 ~ 200 DEG C, makes waxed blade 1 melt from core; Room temperature is down in baking end, obtains Unitary Impeller core 5.With zircon flour coating, surperficial flow coat is carried out in the blade forming region 6 of Unitary Impeller core 5, then by 5 fire dryings of Unitary Impeller core, to obtain final product.
Comparative example 2
The present embodiment makes as follows:
A) wax injector cast blade mold is used to obtain multiple waxed blade 1; Blade mold makes according to the hydraulic model figure of impeller;
B) by waxed blade 1 correcting process, newspaper glue need be used to be wrapped up in the face with sand mold contact of waxed blade 1, and blade base 101 is without the need to parcel; On the bottom surface of core box 2, the multiple locating slot 201 for connecting waxed blade 1 of digital control processing, fits tightly the locating slot 201 that waxed blade 1 inserts core box 2 bottom surface, puts into the arbor welded;
C) in core box 2, inject the water-glass sand through mixed system, waxed blade 1 is imbedded in water-glass sand completely, inject water-glass sand process scraper plate and scrape off unnecessary sand to shaping; CO is poured in core box 2gas makes water-glass sand solidify, and obtains the core containing waxed blade; Install beforehand arbor 3 in core is so that lifting;
D) taken out from core box 2 by the core containing waxed blade, the core of baking containing waxed blade, baking temperature is 160 ~ 200 DEG C, makes waxed blade 1 melt from core; Room temperature is down in baking end, obtains Unitary Impeller core 5.With zircon flour coating, surperficial flow coat is carried out in the blade forming region 6 of Unitary Impeller core 5, then by 5 fire dryings of Unitary Impeller core, to obtain final product.
Comparative example 3
Make as follows:
A) in composite core formwork tool, inject the water-glass sand through mixed system, add arbor, inject water-glass sand process scraper plate and scrape off unnecessary sand to shaping; CO is poured in core box 2gas makes water-glass sand solidify, and obtains five pieces of cores; Composite core formwork tool makes according to the hydraulic model figure of impeller;
B) by five pieces of core correcting process; Be grouped together in the plane and fix, with zircon flour coating, surperficial flow coat being carried out in the blade forming region of Unitary Impeller core, then by 5 fire dryings of Unitary Impeller core, to obtain final product.
Performance test
The method that the core that embodiment and comparative example 1 ~ 3 finally obtain adopts existing core to produce impeller is produced, and the impeller obtained is tested.Concrete impeller production method is: be put in ready made casting mold by the core that embodiment and comparative example 1 ~ 3 finally obtain, 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, obtains impeller after waiting cooling.
Method of testing: the rough and smooth situation of being observed 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 the precision weighing impeller, and the less precision of error is higher.Check the surface roughness of impeller casting with roughmeter, can be used to the precision weighing 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 obtained is smooth, and precision is higher.Comparative example 1 does not adopt masking foil to wrap up waxed blade; Comparative example 2 adopts newspaper to wrap up blade; Comparative example 3 adopts combination core to produce impeller.Can be found out by table 1, the impeller outer surface roughness nominal value of comparative example 1 ~ 3 is all greater than embodiment.Masking foil is not adopted 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 adopting newspaper parcel blade, reason is that in core manufacture process, water-glass sand and waxed blade rubbing cause, and illustrates that the parcel of the present invention to blade has practical significance.The impeller outer surface roughness nominal value of comparative example 2 is obviously greater than embodiment, and applicant adopts masking foil to wrap up blade and compares other leaf packet package methods and can obtain outstanding technique effect, and the use of masking foil has practical significance.The impeller outer surface roughness of comparative example 3 claims value 400um to be obviously greater than the 100um of embodiment, illustrates that preparation method of the present invention compares the method that existing combination core produces impeller, and raising impeller precision can obtain outstanding technique effect.Comparative example 3 estimates that blade is not uniform, combination core seam crossing burr is large, and in order in more accurate applicant's testing result, the uniform error of comparative example 3 blade 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 impulse-free robustness, technique effect is given prominence to.
The above is only preferred embodiment of the present invention, and be not restriction the present invention being made to other form, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the Equivalent embodiments of equivalent variations.But everyly do not depart from technical solution of the present invention content, any simple modification, equivalent variations and the remodeling done above embodiment according to technical spirit of the present invention, still belong to the protection domain of technical solution of the present invention.

Claims (4)

1. a preparation method for Unitary Impeller core, is characterized in that, comprises the steps:
A) wax injector cast blade mold is used to obtain multiple waxed blade (1);
B) the multiple locating slot (201) for connecting waxed blade (1) of digital control processing on the bottom surface of core box (2), locating slot (201) grafting that waxed blade (1) inserts core box (2) bottom surface is fixed, blade (1) and locating slot (201) fit tightly, and put into the arbor (3) 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, pours CO 2gas makes water-glass sand solidify, and obtains the core containing waxed blade;
D) taken out from core box (2) by the core containing waxed blade, the core of baking containing waxed blade makes waxed blade (1) melt from core, is down to room temperature, obtains Unitary Impeller core (5); Zircon flour coating is used surperficial flow coat to be carried out in the blade forming region of Unitary Impeller core (5), then by the fire drying of Unitary Impeller core (5) point;
Described waxed blade (1) is provided with for the blade base (101) with locating slot (201) clamping, and the shape of blade base (101) and the shape of locating slot (201) adapt;
Waxed blade (1) described in step b), before being connected with the bottom surface of core box (2), need use masking foil to be wrapped up by the tow sides of waxed blade (1).
2. the preparation method of Unitary Impeller core according to claim 1, is characterized in that: described locating slot (201) camber, and multiple locating slot (201) is that symmetry axis is symmetrically distributed on the bottom surface of core box (2) with core box (2) axle center.
3. 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.
4. the preparation method of Unitary Impeller core according to claim 1, is characterized in that: the blade mold described in step a) makes according to the hydraulic model figure of impeller.
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CN105598384A (en) * 2016-01-29 2016-05-25 刘士超 Precoated sand casting method for submerged pump impeller
CN108015226B (en) * 2016-04-22 2019-03-29 河北临泉泵业集团有限公司 The production method of precoated sand submersible pump impeller blade sand mold
CN105750497B (en) * 2016-04-22 2018-02-16 河北临泉泵业集团有限公司 A kind of diving pump blower inlet casing blade precoated sand sand mold with and preparation method thereof
CN107745095B (en) * 2017-09-29 2019-06-04 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
CN111299512B (en) * 2018-12-11 2021-04-27 无锡众鑫模具科技有限公司 Water pump impeller casting and production process thereof
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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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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