CN107084127A - A kind of loading machine pumping valve body and its casting method - Google Patents
A kind of loading machine pumping valve body and its casting method Download PDFInfo
- Publication number
- CN107084127A CN107084127A CN201710445034.5A CN201710445034A CN107084127A CN 107084127 A CN107084127 A CN 107084127A CN 201710445034 A CN201710445034 A CN 201710445034A CN 107084127 A CN107084127 A CN 107084127A
- Authority
- CN
- China
- Prior art keywords
- valve body
- cavity
- loam core
- flow channel
- runner
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
-
- 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
- B22C9/103—Multipart cores
-
- 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
- B22C9/106—Vented or reinforced 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
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses the casting method that a kind of loading machine pumps valve body, it is characterised in that following steps：Coremaking includes loam core casting, loam core assembling and loam core coating, and loam core is cast using special loam core sand, and uses the special stud of triangle during assembling loam core；The loam core assembled is put into sandbox during cast and poured into a mould, the sandbox uses the double-deck precoated sand cover plate with sand mold gas extraction system.Valve body is pumped the invention also discloses a kind of loading machine, the inside of the valve body is provided with first flow, second flow channel, third flow channel, the 4th runner, the first cavity and the second cavity, first cavity is connected with the first flow and second flow channel, and second cavity is connected with the third flow channel and the 4th runner.The advantage for the pumping valve body that casting method of the present invention is cast out is the defects such as pore-free, shrinkage porosite, crackle, and body cavity is without fracture, valve outer surface roughness uniformity.
Description
Technical field
The present invention relates to valve body and its casting method field, more particularly to a kind of loading machine pumping valve body and its casting side
Method.
Background technology
Though China is construction machinery production big country at present, industry is big without strong, low-and-medium-grade products production capacity surplus, high-grade liquid
Element almost all dependence on import is pressed, the serious development for lagging behind main frame industry of development of Hydraulic Industry, is equipment as restriction
The main bottleneck of development of manufacturing.At present, China's hydraulic part industry integral fabrication technique level compared with international advanced country still
There is larger gap.
Casting is will to be poured into by the metal liquid of melting in casting mold, shape and performance needed for being obtained through cooled and solidified
The manufacturing process of part.Casting is conventional manufacture method, and casting main processes include：Metal Melting, model manufacturing, pour
Note solidification and demoulding cleaning etc..For complicated part, because the demoulding is difficult, using loam core model manufacturing, loam core is by high temperature resistant
Special binders and the fireproof coating that is configured to of refractory material.Mostly equipped with pumping valve body, pumping valve body system work on loading machine
Key components and parts in journey mechanical system, pumping valve body moulding inner flow passage is complicated, and the small inner chamber of oil inlet is big, and the stream in inner chamber
Road almost without the strong point, makes inner chamber the casting flaws such as fracture, stomata easily occur, causes valve body to be produced under pressure state and ooze
Leakage, and there is the defect of stomata, bubble in valve body moulding outer surface.
Therefore it provides a kind of loading machine pumping valve body and its casting method, casting venthole, bubble are less, outer surface is thick
The relatively low pumping valve body of rugosity uniformity, inner chamber fracture ratio, it appears increasingly important.
The content of the invention
The defect that the purpose of the present invention is present for prior art is there is provided a kind of stomata, bubble are less, outer surface roughness
Uniformity and the relatively low pumping valve body of inner chamber fracture ratio and its casting method.
In order to solve the technical problem in background technology, the invention provides the casting side that a kind of loading machine pumps valve body
Method, including mould preparation, coremaking, shell processed, with shell, moulding, cast and cleaning checking procedure, it is characterised in that following steps：
Coremaking includes loam core casting, loam core assembling and loam core coating, and loam core is cast using special loam core sand, the special mud
Core sand for high intensity chromite sand and common loam core sand mix, the loam core by a main core and one small core assembling and
Into, assemble the main core and small core when the special stud of triangle is used to increase the stability and fastness of loam core；
During cast, the loam core assembled is put into sandbox and poured into a mould, the sandbox uses double with sand mold gas extraction system
Layer precoated sand cover plate reaches maximum exhaust, the gas in molten iron is smoothly discharged.
Preferably, HA377 water based paints are used during the loam core coating and a certain amount of graphite powder are added as described
The coating of loam core, the Baume degrees of the loam core coating is controlled in é -42 ° of B é of 35 ° of B.
Preferably, common mud of the special loam core sand using the chromite sand of 70%-90% high intensity as the 10-30% that advocates peace
Supplemented by core sand, a diameter of 1-3mm reinforcing bar is placed with as arbor in the main aperture of the main core of loam core.
Correspondingly, valve body, the valve are pumped present invention also offers a kind of loading machine cast using the casting method
Body is in truncated cone-shaped, and the body top is rectangle, the inside of the valve body provided with first flow, second flow channel, third flow channel,
4th runner, the first cavity and the second cavity, the first flow quantity are four；The body top is provided with and described
Four corresponding first-class road junctions of one runner, the bottom of the valve body is provided with and second flow channel, third flow channel and the 4th stream
The corresponding second road junction in road, third flow channel mouthful and the 4th runner mouthful；First cavity and the first flow and second
Runner is connected, and second cavity is connected with the third flow channel and the 4th runner.
Preferably, four first-class road junctions, which are rectangle, is arranged in the body top, the second road junction,
Linearly type is arranged in the bottom for stating valve body for three runners mouthful and the 4th runner mouthful.
Preferably, the first flow, second flow channel, third flow channel and the 4th runner are all the runner of vertical direction.
Further, the diameter of the first flow is more than the diameter of the second flow channel, third flow channel and the 4th runner.
Preferably, first cavity and the second cavity are all that cavity and in the vertical direction in the horizontal direction are mutually put down
OK.
Preferably, four first flows are highly equal and extended to from body top in valve body, described four first
Runner is vertically intersected on first cavity and connected with the first cavity.
Specifically, the second flow channel extends to first cavity from body base and is connected with the first cavity, institute
Third flow channel and the 4th runner is stated to extend to second cavity from body base and with the second cavity be connected.
Preferably, the valve body is by casting and being integrally formed.
The loading machine pumping valve body for the casting method casting that the present invention is provided, has the advantages that：
1. special loam core sand coremaking is used, and placement diameter 1-3mm reinforcing bar is used as core inside the main aperture of the main core of loam core
Bone, while using the special chaplet loam core of triangle, loam core intensity is increased by triplicity so that loam core is not easy to break,
And pour that the valve body moulding outpoured is highly reliable, qualification rate is high.
2. sandbox uses the double-deck precoated sand cover plate with sand mold gas extraction system, the gas in molten iron is smoothly discharged, make
Obtain valve body moulding pore-free, air blister defect.
3. loam core is using HA377 water based paints and adds a certain amount of graphite powder as coating, the Baume degrees control of coating exists
é -42 ° of B é of 35 ° of B, effectively prevent sintering and scab phenomenon, and ensure that the surface smoothness of valve flowing channel.
Brief description of the drawings
, below will be to required in embodiment or description of the prior art in order to illustrate more clearly of technical scheme
The accompanying drawing used is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, right
For those of ordinary skill in the art, on the premise of not paying creative work, it can also be obtained according to these accompanying drawings
Its accompanying drawing.
Fig. 1 is the front view of present invention pumping valve body；
Fig. 2 is the top view of present invention pumping valve body；
Fig. 3 is Fig. 2 D-D directions and the sectional view in G-G directions；
Fig. 4 is the upward view of present invention pumping valve body；
Fig. 5 is the sectional view in Fig. 4 A-A directions；
Fig. 6 is the sectional view in Fig. 4 H-H directions；
Fig. 7 is the sectional view in Fig. 5 B-B directions；
Fig. 8 is the sectional view in Fig. 5 C-C directions；
Fig. 9 is the top view of the triangle stud of the loam core use of present invention pumping valve body.
Wherein, reference is corresponded in figure：3- first flows, the first-class road junctions of 4-, 5- second flow channels, 6- the 3rd flows
Road, the runners of 7- the 4th, 8- seconds road junction, 9- third flow channels mouthful, the runners mouthful of 10- the 4th, the cavitys of 11- first, 12- second is empty
Chamber.
Embodiment
Below in conjunction with accompanying drawing, the technical scheme in example is applied to the present invention and is clearly and completely described, it is clear that is retouched
The embodiment stated is only a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, sheet
The every other embodiment that field those of ordinary skill is obtained on the premise of creative work is not made, belongs to this hair
The scope of bright protection.
Embodiment：The invention provides the casting method that a kind of loading machine pumps valve body, comprise the following steps：
S1. die for making core is checked, the dirt of die surface is cleared up；
S2. coremaking, including loam core casting, loam core assembling and loam core coating, loam core is cast using special loam core sand, described special
It is described supplemented by 20% common loam core sand with loam core sand based on the loam core sand of the HAGHD290 models of 80% high intensity
The composition of the loam core sand of HAGHD290 models based on chromite sand, the loam core by a main core and one small core assembling and
Into a diameter of 2mm of placement reinforcing bar uses triangle as arbor when assembling the main core and small core inside the main aperture of the main core
The special stud of shape is to increase during the stability and fastness of loam core, the loam core coating using HA377 water based paints and add
Enter a certain amount of graphite powder as the coating of the loam core, the Baume degrees of the loam core coating is controlled in é -42 ° of B é of 35 ° of B；
S3. shell processed, from precoated sand material arenaceous shell；
S4. match somebody with somebody shell, check arenaceous shell, loam core whether there is damages, and has burr to be struck off with file, arenaceous shell and loam core assemble preceding pressure
Residual sand is floated ash and blown off by contracting air, and loam core is put into arenaceous shell after inspection is errorless；
S5. moulding, cast, arenaceous shell is put into sandbox, is buried by hand in arenaceous shell, arenaceous shell outer surface and sandbox using resin sand
Covered between side in layer of sand, layer of sand provided with the pouring and riser systemses connected with arenaceous shell, molten iron is passed through into pouring and riser systemses injection type intracavitary, institute
Stating sandbox uses the double-deck precoated sand cover plate with sand mold gas extraction system to reach maximum exhaust so that the gas in molten iron is smoothly arranged
Go out；
S6. after valve body shaping, loam core is defeated and dispersed due to high temperature, so as to form the runner and cavity of body cavity；
S7. cleaning is examined, and checks whether inner chamber is broken valve body moulding, if having stomata, air blister defect, cast outer surface is thick
Rugosity whether uniformity, the every batch of valve body moulding extracts 2% and carries out dissection inspection.
Valve body is pumped present invention also offers a kind of loading machine cast using the casting method, Fig. 1-Fig. 7 is referred to,
The valve body is in be rectangle at the top of truncated cone-shaped, the valve body, and the inside of the valve body is provided with first flow 3, second flow channel
5th, third flow channel 6, the 4th runner 7, the first cavity 11 and the second cavity 12, the quantity of first flow 3 are four, and first-class
Road 3, second flow channel 5, the runner 7 of third flow channel 6 and the 4th are all the runner of vertical direction；The body top be provided with it is described
Four corresponding first-class road junctions 4 of first flow 3, the bottom of the valve body be provided with second flow channel 5, third flow channel 6 and
The corresponding second road junction 8 of 4th runner 7, the runner mouthful 10 of third flow channel mouthful 9 and the 4th；First cavity 11 and described the
One runner 3 is connected with second flow channel 5, and second cavity 12 is connected with the runner 7 of third flow channel 6 and the 4th.
Preferably, described four first-class road junctions 4, which are rectangle, is arranged in the body top, the second road junction 8,
The 10 linear types of runner mouthful of third flow channel mouthful 9 and the 4th are arranged in the bottom for stating valve body.
Preferably, the diameter of the first flow 3 be more than the second flow channel 5, the runner 7 of third flow channel 6 and the 4th it is straight
Footpath.
Further, the cavity 12 of the first cavity 11 and second is all cavity and in the vertical direction in the horizontal direction
It is parallel to each other.
Specifically, four first flows 3 are highly equal and extended to from body top in valve body, described four first
Runner 3 is vertically intersected on first cavity 11 and connected with the first cavity 11.
Specifically, the second flow channel 5 extends to first cavity 11 from body base and is connected with the first cavity 11
Logical, the runner 7 of third flow channel 6 and the 4th extends to second cavity 12 from body base and is connected with the second cavity 12
It is logical.
Preferably, the valve body is by casting and being integrally formed.
The important technological parameters of the pumping valve body moulding of the present invention are as follows：
(1) material：HT300
(2) body tensile strength：≥300Mpa
(3) hardness：HB190-230
(4) without casting flaws such as slag inclusion, stomata, shrinkage cavity and porosities
(5) valve weight：6.32kg
The loading machine pumping valve body of casting method casting of the present invention, has the advantages that：
1. use special loam core sand coremaking, and diameter 2mm reinforcing bar is placed inside the main aperture of the main core of loam core as arbor,
The special chaplet loam core of triangle is utilized simultaneously, loam core intensity is increased by triplicity so that loam core is not easy to break, and
Pour that the valve body moulding outpoured is highly reliable, qualification rate is high.
2. sandbox uses the double-deck precoated sand cover plate with gas extraction system, the gas in molten iron is set smoothly to discharge so that valve
Body casting pore-free, air blister defect.
3. loam core is using HA377 water based paints and adds a certain amount of graphite powder as coating, the Baume degrees control of coating exists
é -42 ° of B é of 35 ° of B, effectively prevent sintering and scab phenomenon, and ensure that the surface smoothness of valve flowing channel.
Above disclosed is only several preferred embodiments of the present invention, can not limit the present invention's with this certainly
Interest field, therefore the equivalent variations made according to the claims in the present invention, still belong to the scope that the present invention is covered.
Claims (10)
1. a kind of loading machine pumps the casting method of valve body, including mould preparations, coremaking, shell processed, with shell, moulding, cast and clearly
Manage checking procedure, it is characterised in that following steps：
Coremaking includes loam core making, loam core assembling and loam core and covered with paint, lacquer, colour wash, etc., and loam core is made using special loam core sand, the special loam core sand
Chromite sand and common loam core sand for high intensity are mixed, and the loam core uses the special stud of triangle by main core and small core
Assemble；
During cast, the loam core assembled is put into sandbox and poured into a mould, the sandbox is covered using double-deck precoated sand cover plate, the bilayer
Film sand cover plate has sand mold gas extraction system.
2. loading machine according to claim 1 pumps the casting method of valve body, it is characterised in that：The loam core covers with paint, lacquer, colour wash, etc. process
Middle use HA377 water based paints simultaneously add a certain amount of graphite powder as the coating of the loam core, the Baume degrees of the loam core coating
Control is in é -42 ° of B é of 35 ° of B.
3. loading machine according to claim 1 pumps the casting method of valve body, it is characterised in that：The special loam core sand with
The chromite sand of 70%-90% high intensity be advocate peace 10%-30% common loam core sand supplemented by, be placed with the main aperture of the main core
A diameter of 1-3mm reinforcing bar is used as arbor.
4. a kind of loading machine pumping valve of the casting method casting in 1-3 according to claim described in any one claim
Body, it is characterised in that：The inside of the valve body is provided with first flow (3), second flow channel (5), third flow channel (6), the 4th runner
(7), the first cavity (11) and the second cavity (12), first flow (3) quantity are four；The body top be provided with
Four corresponding first-class road junctions (4) of the first flow (3), the bottom of the valve body is provided with and second flow channel (5), the
Three runners (6) and the corresponding second road junction (8) of the 4th runner (7), third flow channel mouthful (9) and the 4th runner mouthful (10)；Institute
State the first cavity (11) with the first flow (3) and second flow channel (5) to be connected, second cavity (12) and the described 3rd
Runner (6) is connected with the 4th runner (7).
5. loading machine according to claim 4 pumps valve body, it is characterised in that：Four first-class road junctions (4) are in length
Square arrangement is in the body top, and the second road junction (8), third flow channel mouthful (9) and the 4th runner mouthful (10) are linearly
Type is arranged in the bottom for stating valve body.
6. loading machine according to claim 4 pumps valve body, it is characterised in that：The first flow (3), second flow channel
(5), third flow channel (6) and the 4th runner (7) are all the runner of vertical direction, and the diameter of the first flow (3) is more than institute
State the diameter of second flow channel (5), third flow channel (6) and the 4th runner (7).
7. loading machine according to claim 4 pumps valve body, it is characterised in that：First cavity (11) and the second cavity
(12) it is all that cavity and in the vertical direction in the horizontal direction is parallel to each other.
8. loading machine according to claim 7 pumps valve body, it is characterised in that：Four first flows (3) height phase
Deng and extended to from body top in valve body, four first flows (3) be vertically intersected on first cavity (11) and with
First cavity (11) connects.
9. loading machine according to claim 8 pumps valve body, it is characterised in that：The second flow channel (5) is from body base
Extend to first cavity (11) and be connected with the first cavity (11), the third flow channel (6) and the 4th runner (7) are from valve
Body bottom extends to second cavity (12) and is connected with the second cavity (12).
10. the loading machine pumping valve body according to any one claim in claim 4-9, it is characterised in that：It is described
Valve body is by casting and being integrally formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710445034.5A CN107084127A (en) | 2017-06-12 | 2017-06-12 | A kind of loading machine pumping valve body and its casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710445034.5A CN107084127A (en) | 2017-06-12 | 2017-06-12 | A kind of loading machine pumping valve body and its casting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107084127A true CN107084127A (en) | 2017-08-22 |
Family
ID=59605759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710445034.5A Pending CN107084127A (en) | 2017-06-12 | 2017-06-12 | A kind of loading machine pumping valve body and its casting method |
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| Country | Link |
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| JPH07217512A (en) * | 1994-02-01 | 1995-08-15 | Mazda Motor Corp | Air intake device for engine and core structure thereof |
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| CN203578688U (en) * | 2013-11-27 | 2014-05-07 | 青岛大运机械有限公司 | Sand core |
| CN105782500A (en) * | 2016-04-22 | 2016-07-20 | 南通华东油压科技有限公司 | Large-duty loader hydraulic valve body casting |
| CN105903910A (en) * | 2016-04-22 | 2016-08-31 | 南通华东油压科技有限公司 | Monolithic multi-way valve body casting piece casting method |
| CN205599868U (en) * | 2016-05-12 | 2016-09-28 | 南通华东油压科技有限公司 | Multiple directional control valve casting mould |
-
2017
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3553808A (en) * | 1969-03-21 | 1971-01-12 | Int Harvester Co | Casting and machining of an internally ported and passaged cylinder head |
| JPS60102250A (en) * | 1983-11-07 | 1985-06-06 | Toyota Motor Corp | Supporting method of sand core in casting mold |
| JPH02123260A (en) * | 1988-10-31 | 1990-05-10 | Izumi Ind Ltd | Manufacture of piston for internal combustion engine |
| JPH07217512A (en) * | 1994-02-01 | 1995-08-15 | Mazda Motor Corp | Air intake device for engine and core structure thereof |
| CN101780525A (en) * | 2010-02-26 | 2010-07-21 | 山西斯普瑞机械制造有限公司 | Process for casting oil distribution disc of vane pump |
| CN101947641A (en) * | 2010-10-28 | 2011-01-19 | 江苏金石铸锻有限公司 | Casting process of valve casing |
| CN103495695A (en) * | 2013-10-16 | 2014-01-08 | 合肥市田源精铸有限公司 | Chilled mud-core molding sand manufactured from chromite sand and method for manufacturing chilled mud-core molding sand |
| CN203578688U (en) * | 2013-11-27 | 2014-05-07 | 青岛大运机械有限公司 | Sand core |
| CN105782500A (en) * | 2016-04-22 | 2016-07-20 | 南通华东油压科技有限公司 | Large-duty loader hydraulic valve body casting |
| CN105903910A (en) * | 2016-04-22 | 2016-08-31 | 南通华东油压科技有限公司 | Monolithic multi-way valve body casting piece casting method |
| CN205599868U (en) * | 2016-05-12 | 2016-09-28 | 南通华东油压科技有限公司 | Multiple directional control valve casting mould |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170822 |
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| RJ01 | Rejection of invention patent application after publication |