CN105834376A - Centrifugal pump impeller casting process - Google Patents
Centrifugal pump impeller casting process Download PDFInfo
- Publication number
- CN105834376A CN105834376A CN201610358446.0A CN201610358446A CN105834376A CN 105834376 A CN105834376 A CN 105834376A CN 201610358446 A CN201610358446 A CN 201610358446A CN 105834376 A CN105834376 A CN 105834376A
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- China
- Prior art keywords
- impeller
- casting
- centrifugal pump
- pump impeller
- formwork
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Classifications
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- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a centrifugal pump impeller casting process. The process of conducting pouring according to a mold shell is the core of the centrifugal pump impeller casting process. The mold shell comprises a central hole corresponding to a to-be-cast impeller shaft hole so that the impeller shaft hole cannot be cast out. The centrifugal pump impeller casting process is characterized in that 2-4 axial ribs are evenly arranged along the circumference of the inner wall of the central hole of the mold shell so that a central columnar straight spure and 2-4 diversion inner spures connected into a whole together with the central columnar straight spure can be formed during pouring; and each diversion inner spure is formed by the area between the two corresponding adjacent ribs during pouring. By means of the process, it can be ensured that the shape and size of a shell mold are stable in the precise casting process, and therefore the impeller deformation shrinkage during casting is reduced, the impeller finished product percent of pass is increased, the efficiency of centrifugal pumps is improved, and the service life of the centrifugal pumps is prolonged.
Description
Technical field
The present invention relates to centrifugal multistage pump multiple centrifugal pump, be specifically related to a kind of centrifugal pump impeller precision casting process, belong to centrifugal pump leaf
Wheel casting technology field.
Background technology
Centrifugal pump structure is complicated, required precision is high, therefore requires the strictest to casting technique.Particularly high-speed centrifugal pump leaf
Wheel, as one of critical component affect centrifugal multistage pump multiple centrifugal pump operating efficiency, higher to casting technique requirement, impeller shape line correct
Property directly affect centrifugal pump service efficiency, Product Precision and the compatible degree high unity of design size, be to ensure that efficiency of centrifugal pump
Main factor.At present, pump industry producer all use casting method to reduce impeller deflection, its hot investment casting scheme
For, centre bore does not casts out, and adds and subsidize in supreme choma position the upper surface watered, and horizontal dead head model is welded to corresponding position,
As shown in figure 1, figure 2 and figure 3.Fig. 1 show the primary products that cast is formed, and wherein casting mesh line is for needing processing or cutting
The part sliced off, remaining part i.e. diagonal line is only the impeller product being actually needed.Owing to centre bore is closed, in finish cast die shell
Empty without strengthening, in roasting process, centre bore position is empty, and intensity is relatively low, and choma chamber axially expands, and causes vane type line overall
Upper shifting, and then affect product hydraulic performance.Meanwhile, in casting cycle, formwork centre bore lower surface is directly impacted by molten steel, pole
Easily cause end opening annular strain or leak, causing higher percent defective.
Its Deformation Reasons of the process program concrete analysis not casting out centre bore is as follows:
1) deformation of wax pattern is divided into the three below stage:
1.1), after compacting model, high temperature wax liquid shrinks, and due to still pressurize in metal pattern, does not deforms.
1.2), after taking out, in room temperature pressure maintaining period, stress progressively discharges present in the wax-pattern, expands, or non-homogeneous
Deformation, and wax consistency is the highest, stress is little, and therefore deformation extent is the least.
1.3) process of loosing core is one of Main Stage of wax deformation, after urea core is dissolved, and the internal shape line constant interval of runner
Increase, and entirety loses support, deforms.
2) shell processed deformation is divided into the following two stage:
2.1) dewaxing process deformation: shell processed dewaxing time, in middle temperature dewaxing kettle heating, shell mould deforms, although mullite and
Ludox elevated temperature strength is good, still has trickle deformation.
2.2) roasting process deformation: being to include the stage that deflection in wax-pattern deformation is maximum, overall shell mould is at 1050 DEG C
Lower roasting, tilts without support zone, bends.
3) casting cycle deformation
3.1) impact deformation, high-temperature molten steel direct impulsive model at short notice, impact deformation.
3.2) process of setting deformation, is one of maximum process of deflection, and during solidification shrinkage, bucket cover plate shrinks and is subject to
Hindering to blade, deflection is less, but centre is non-resistance contraction, and deformation carries out in the axial direction, and then causes impeller
Bulk deformation.
In a word, use traditional center not blowhole technique to be difficult to control the contraction distortion of blank, cause impeller local contraction
Deformation, blade-shaped line changes, and increases product and design calculated flow rate, the isoparametric difference of lift, is to cause impeller difficult
To reach one of basic reason checking and accepting rank.
Summary of the invention
For deficiencies of the prior art, it is an object of the invention to provide a kind of centrifugal pump impeller hot investment casting work
Skill, during this technique ensure that hot investment casting, shell mould geomery is stable, and then impeller deformation retract when reducing casting, carries
High impeller product qualified rate, improves efficiency of centrifugal pump and service life.
For solving above-mentioned technical problem, present invention employs techniques below scheme:
A kind of casting centrifugal pump impeller technique, its core is to carry out, according to formwork, the process poured into a mould, and described formwork has and waits to cast
Make the centre bore that impeller shaft hole is corresponding, so that impeller shaft hole does not casts out；It is characterized in that: described formwork center bore inner wall is circumferentially
It is uniformly provided with the rib that 2-4 road is axial, so that forming center pillar sprue during cast and being linked as one with center pillar sprue
Ti 2-4 road shunting ingate, described shunting ingate is formed when cast by the region between adjacent two ribs.
Center pillar sprue diameter g is less than impeller shaft hole diameter.
Shunting ingate height dimension is inner wear ring height.
Formwork centre bore has arc-shaped protrusions upwards, so that the casting of impeller shaft hole bottom forms arc groove, groove arc
Degree is 1.1-2 times of inner wear ring diameter.
During cast, directly water that size a is collar extension ring thickness D 1.05-1.2 times, horizontal size b of watering is directly to water the 1.05-of size a
1.2 times, emitting bore c is horizontal water size b 1. 5-3 times, and Riser Dimensions e is emit bore c 1. 2-2 times, waters width f in shunting
For 1.05-1.2 times of inner wear ring thickness d, center pillar directly waters 1.1-1.3 times that diameter g is inner wear ring height h；Arc groove
Top to 0.2-0.5 times that height j is inner wear ring height h of impeller lowermost end.
Compared with prior art, there is advantages that
1, this technique is watered in column sprue, and uniform divided flows four road are placed in position, impeller central hole, establishes effective deformation
Resistance, inside waters the effect simultaneously working as reinforcement, is connected to shell mould entity, no matter in dewaxing, formwork roasting, or at process of setting
In, all play positive role to hindering contraction distortion.
2, formwork center bore inner wall of the present invention arranges 2-4 road rib, is conducive to suppression formwork roasting process deformation, effectively
Improve the intensity of formwork, it is ensured that formwork appearance and size and the uniformity of design size, and then decrease owing to formwork deforms
The impeller shape line deformation caused.
3, the impeller shaft hole position that the casting of this technique obtains is formed with the through hole corresponding with formwork rib, owing to through hole is tied
Structure, it is simple to impeller shaft hole is cut out by following process.
4, arc groove shunting mode is used can to effectively reduce formwork impact force bottom center pillar of the present invention,
Reduce the risk that formwork leaks, improve cost qualification rate.
In a word, patternmaking process of the present invention deformation is little, fills type steady during hot investment casting, and head is homogeneous, shrinkage stress
Homogeneous, by transformation casting system, foundry goods shrinks and is obstructed, it is ensured that the shape line of impeller blade, improves the grade of impeller.The present invention exists
Improve traditional handicraft drawback unmanageable to size distortion on the basis of traditional handicraft, improve impeller yield rate, further
Improve the operating efficiency of centrifugal pump impeller, it is achieved that higher economic worth.
Accompanying drawing explanation
Fig. 1-existing casting system configuration picture.
Fig. 2-Fig. 1 top view.
Fig. 3-existing impeller shaft hole does not cast out schematic diagram.
Casting system configuration picture after Fig. 4-present invention improvement.
Fig. 5-Fig. 4 A direction view.
Traditional handicraft impeller measurement data points schematic diagram in Fig. 6-contrast experiment.
Detailed description of the invention
The present invention is described in detail with detailed description of the invention below in conjunction with the accompanying drawings.
Seeing Fig. 4-Fig. 5, it can be seen that casting centrifugal pump impeller technique of the present invention from figure, its core is according to formwork
Carrying out the process poured into a mould, described formwork has the centre bore corresponding with impeller shaft hole to be cast, so that impeller shaft hole does not casts out, waters
Impeller shaft hole is gone out by processes such as cuttings again after casting.It is axial that described formwork center bore inner wall is circumferentially uniformly provided with 2-4 road
Rib so that watering in forming center pillar sprue and the 2-4 road shunting that is connected as a single entity with center pillar sprue during cast
Road, described shunting ingate is formed when cast by the region between adjacent two ribs.During actual design, rib be 4 roads and in
90 ° of fan annulars, so casting impeller shaft hole position cross section out is cross structure, and cross part constitutes center pillar
Sprue, remainder constitutes 4 road shunting ingates.
Center pillar sprue diameter g is less than impeller shaft hole diameter, in the case of ensureing feeding capacity, increases office in formwork
Portion's back-up sand thickness, increases shell mould intensity.
Formwork centre bore has arc-shaped protrusions upwards, so that the casting of impeller shaft hole bottom forms arc groove, groove arc
Degree is 1.1-2 times of inner wear ring diameter.
The present invention uses center pillar distributary pouring system, and centered by the method improvement close conventional centre bore, column is straight
Water and shunt the scheme watering synergistic application.During actual casting, casting system each several part size is shown in Table 1.Represented by each symbol
Size is shown in Fig. 4 and Fig. 5.
Table 1
| Title | Directly water | Horizontal water | Emit bore | Rising head | Width X4 is watered in annular shunting | Center pillar directly waters diameter | Arc groove |
| Code name | a | b | c | e | f | g | j |
| Size | (1.05-1.2) D | (1.05-1.2) a | (1.5-3) b | (1.2-2)c | (1.05-1.2) d | (1.1-1.3)h | (0.2-0.5)h |
Wherein, D is collar extension ring thickness, and d is inner wear ring thickness, and h is inner wear ring height；J refers to that the top of arc groove is to impeller
The height of bottom；
The contrast of the present invention and former casting system master data is as follows, wherein casting yield=part blank weight/(part blank weight+
Pouring and riser systems weight).
| Casting technique | Casting yield | Deflection |
| Former casting system | 47.1% | Inside and outside choma Concentricity tolerance is averagely more than 2mm |
| Center pillar distributary pouring | 49.9% | Concentricity tolerance average out to 20-50 silk |
In roasting process, formwork deformation is the one of the main reasons affecting the change of impeller shape line, and center pillar separate system is being mended
Being equal to former technique in contracting performance, but water, in shunting, the effect simultaneously working as reinforcement, blade wheel structure change in size is minimum, to carrying
High efficiency of centrifugal pump is the strongest.
The present invention uses center pillar distributary pouring system to cast, and places column sprue, generation at central hole location
Hole is not cast out for former technique.Center pillar sprue waters in using the shunting of 2-4 road, and shunting gate width a size of inner wear ring is thick
1.05-2 times of degree, height dimension is inner wear ring height.
In order to verify the present invention improve after effect, below use experiment carry out comparative illustration.
Experimental technique
1) using 15Cr12 as founding materials, cast certain model secondary impeller, each two impellers of the old and new's technique are as exemplar.
2) using Ludox and mullite is hot investment casting auxiliary material, and middle temperature wax is as wax pattern raw material.
3) respectively the impeller of the old and new's technique casting is dissected, point released by checking three sections root of blade shape line to compare technique excellent
Bad.
4) detailed process parameter is shown in Table 2；
Table 2 hot investment casting experiment parameter
| Numbering | Material | Method | Technological parameter |
| 1 | 15Cr12 | Traditional handicraft | 1050 DEG C of x30min roastings of formwork；1580 DEG C of casting |
| 2 | 15Cr12 | Present invention process | 1050 DEG C of x30min roastings of formwork；1580 DEG C of casting |
5) the axis centre hole that traditional handicraft uses does not casts out, and constantly increases along thermal center direction, center thickness.
6) this technique takes central straight to water separate system, the method substituting traditional handicraft casting half bore.
Experimental result
Finding after processing that the centre bore that traditional handicraft is used does not casts out method, impeller central deforms in the axial direction, deflection
Being about+5-7mm, without allowance, there is serious change in blade-shaped line, and such as Fig. 6, (wherein heavy line is shape line after deformation, carefully real
Line is design shape line).
And central straight of the present invention is watered separate system co-located deflection under same process parameter and is only+0.2-0.5mm, chi
Very little precision reaches A-B level impeller test stone, as shown in Table 3, 4.
Table 3 traditional handicraft impeller deformation detection data
| Measure position | 1 | 2 | 3 |
| 1-1# deflection (mm) | +0.1 | +2.13 | +5 |
| 1-2# deflection (mm) | +0.08 | +2.4 | +6.7 |
Table 4 new technology impeller deformation detection data
| Measure position | 1 | 2 | 3 |
| 2-1# deflection (mm) | +0.02 | +0.1 | 0.3 |
| 2-2# deflection (mm) | +0.02 | +0.14 | 0.4 |
Compared with traditional handicraft, the new technology after improvement uses central straight to water separate system, it is ensured that thermal center is the most gradually
On the basis of increase, the casting system in improvement traditional handicraft, column sprue, and uniform divided flows four road is placed in centre bore position
Inside water.Establish effective deformation drag, inside water the effect simultaneously working as reinforcement, be connected to shell mould entity, no matter dewaxing,
Roasting, or in process of setting, to hindering contraction distortion all to play positive role, product relatively traditional handicraft has more Functionality, quality and appealing design
Gesture.The present invention improves traditional handicraft drawback unmanageable to size distortion on the basis of traditional handicraft, improves impeller
Product rate, further increases the operating efficiency of centrifugal pump impeller, it is achieved that higher economic worth.
Finally illustrating, above-described embodiment is merely to illustrate technical scheme and unrestricted, although with reference to relatively
The present invention has been described in detail by good embodiment, it will be understood by those within the art that, can be to the skill of the present invention
Art scheme is modified or equivalent, and without deviating from objective and the scope of technical solution of the present invention, it all should be contained at this
In the middle of the right of invention.
Claims (4)
1. a casting centrifugal pump impeller technique, its core is to carry out, according to formwork, the process poured into a mould, and described formwork has and treats
The centre bore that casting impeller axis hole is corresponding, so that impeller shaft hole does not casts out；It is characterized in that: described formwork center bore inner wall is along circle
It is uniformly provided with the rib that 2-4 road is axial week, so that forming center pillar sprue during cast and being linked as with center pillar sprue
The 2-4 road shunting ingate of one, described shunting ingate is formed when cast by the region between adjacent two ribs.
Casting centrifugal pump impeller technique the most according to claim 1, it is characterised in that: shunting ingate height dimension is interior
Choma height.
Casting centrifugal pump impeller technique the most according to claim 1, it is characterised in that: formwork centre bore has arc upwards
Shape projection, so that the casting of impeller shaft hole bottom forms arc groove, groove radian is 1.1-2 times of inner wear ring diameter.
Casting centrifugal pump impeller technique the most according to claim 1, it is characterised in that: during cast, directly watering size a is collar extension
1.05-1.2 times of ring thickness D, horizontal size b of watering is directly water size a 1.05-1.2 times, and emitting bore c is horizontal to water the 1. of size b
5-3 times, Riser Dimensions e is emit bore c 1. 2-2 times, water in shunting that width f is inner wear ring thickness d 1.05-1.2 times, in
Stem shape directly waters 1.1-1.3 times that diameter g is inner wear ring height h；The top of arc groove is interior to the height j of impeller lowermost end
0.2-0.5 times of choma height h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610358446.0A CN105834376B (en) | 2016-05-26 | 2016-05-26 | A kind of casting centrifugal pump impeller technique |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610358446.0A CN105834376B (en) | 2016-05-26 | 2016-05-26 | A kind of casting centrifugal pump impeller technique |
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| CN105834376A true CN105834376A (en) | 2016-08-10 |
| CN105834376B CN105834376B (en) | 2018-03-09 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107008857A (en) * | 2017-04-17 | 2017-08-04 | 东方电气集团东方汽轮机有限公司 | The ceramic shell mould and its forming method of variable cross-section parts of Casting thermal fragmentation defect can be eliminated |
| CN108561329A (en) * | 2018-01-09 | 2018-09-21 | 鹰普机械（宜兴）有限公司 | A kind of stainless steel impeller precision castings and its founding |
| CN110842147A (en) * | 2019-11-29 | 2020-02-28 | 西安航天发动机有限公司 | Method for controlling size of closed impeller investment precision casting runner |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5588954A (en) * | 1978-12-27 | 1980-07-05 | Kubota Ltd | Casting method of double suction centrifugal pump |
| JPS59232810A (en) * | 1983-06-15 | 1984-12-27 | Toyota Motor Corp | Mold for impeller model |
| CN103111588A (en) * | 2013-01-30 | 2013-05-22 | 洛阳双瑞精铸钛业有限公司 | Manufacturing method of precision casting of titanium alloy impeller |
| CN203018682U (en) * | 2012-12-18 | 2013-06-26 | 安徽应流集团霍山铸造有限公司 | Thin-wall large-plane blade wheel precision cast investment component |
| CN204171276U (en) * | 2014-10-21 | 2015-02-25 | 胜利油田胜利泵业有限责任公司 | Submersible electric pump pump vane casting Wax mold |
-
2016
- 2016-05-26 CN CN201610358446.0A patent/CN105834376B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5588954A (en) * | 1978-12-27 | 1980-07-05 | Kubota Ltd | Casting method of double suction centrifugal pump |
| JPS59232810A (en) * | 1983-06-15 | 1984-12-27 | Toyota Motor Corp | Mold for impeller model |
| CN203018682U (en) * | 2012-12-18 | 2013-06-26 | 安徽应流集团霍山铸造有限公司 | Thin-wall large-plane blade wheel precision cast investment component |
| CN103111588A (en) * | 2013-01-30 | 2013-05-22 | 洛阳双瑞精铸钛业有限公司 | Manufacturing method of precision casting of titanium alloy impeller |
| CN204171276U (en) * | 2014-10-21 | 2015-02-25 | 胜利油田胜利泵业有限责任公司 | Submersible electric pump pump vane casting Wax mold |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107008857A (en) * | 2017-04-17 | 2017-08-04 | 东方电气集团东方汽轮机有限公司 | The ceramic shell mould and its forming method of variable cross-section parts of Casting thermal fragmentation defect can be eliminated |
| CN108561329A (en) * | 2018-01-09 | 2018-09-21 | 鹰普机械（宜兴）有限公司 | A kind of stainless steel impeller precision castings and its founding |
| CN110842147A (en) * | 2019-11-29 | 2020-02-28 | 西安航天发动机有限公司 | Method for controlling size of closed impeller investment precision casting runner |
| CN110842147B (en) * | 2019-11-29 | 2021-03-05 | 西安航天发动机有限公司 | Method for controlling size of closed impeller investment precision casting runner |
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| Publication number | Publication date |
|---|---|
| CN105834376B (en) | 2018-03-09 |
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