CN104722718B - Casting method of mud pump air dome shell for bearing pressure - Google Patents
Casting method of mud pump air dome shell for bearing pressure Download PDFInfo
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- CN104722718B CN104722718B CN201510112026.XA CN201510112026A CN104722718B CN 104722718 B CN104722718 B CN 104722718B CN 201510112026 A CN201510112026 A CN 201510112026A CN 104722718 B CN104722718 B CN 104722718B
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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
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
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- 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
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Abstract
The invention discloses a casting method of a mud pump air dome shell for bearing pressure. The method comprises the following steps: step one. setting process, namely selecting the air dome shell with a downward big opening; optimizing working allowance layer on an outer sphere of the air dome shell; manufacturing a sphere sand core and a core head and a corresponding fixing rod; arranging a thermal-preservation open riser on the top end of the air dome shell; arranging two chilling blocks at the opening end of the air dome shell; installing a pouring runner; and drawing an art work sheet; step two, casting, namely manufacturing a wood core box for a solid pattern and the ball-shaped spherical sand core and the core head; modeling, taking out the solid pattern to form a cavity; manufacturing the spherical sand core, the core head, and a sand core skeleton, and placing an exhaust rope; spraying the paint; carrying out mold assembling, baking a sand mold, pouring, opening the mold; primarily blasting sand; grinding and repairing; normalizing, secondarily blasting sand to obtain the product. Through the adoption of the method disclosed by the invention, the manufactured air dome shell is high in cast precision, and the production cost is obviously reduced.
Description
Technical field
The invention belongs to plant equipment manufacturing technology field, it is related to a kind of casting side of pressure-bearing mud pump air incrustation
Method.
Background technology
Air bag is the vitals on oil drilling and extracting equipment slush pump, plays voltage stabilizing, reduces fluctuation in drilling process
Effect, air incrustation is the part acting primarily as protection and pressure-bearing effect.With reference to Fig. 1, Fig. 2, air incrustation 1 be shaped as sky
Bulbus cordis body, technical requirements are: inner and outer surfaces magnetic powder inspection, volume Non-Destructive Testing, hydrostatic test pressure-bearing 52mpa.
In order to ensure product quality, typically it is made as forging, material is 35crmoa, but the air that this mode forges
Incrustation later stage mechanical processing difficulty is big, and long the production cycle causes production cost higher, and cost is about to cast air incrustation
4 times.
Often defect is more for the casting air incrustation being produced using Regular casting methods, and interior tissue is not fine and close, easily
Cause seepage and crack defect, therefore, be badly in need of developing the new method making air incrustation.
Content of the invention
It is an object of the invention to provide a kind of pressure-bearing casting method of mud pump air incrustation, solve prior art
Middle forging air incrustation mechanical processing difficulty is big, leads to the problem that production cost is higher.
The technical solution adopted in the present invention is, a kind of pressure-bearing casting method of mud pump air incrustation, according to
Lower step is implemented:
Step 1, technique setting
1.1) select the typing scheme of the big mouth down of air incrustation；
1.2) structure according to air incrustation, is optimized setting to the allowance layer of air incrustation spherical outside surface；
1.3) spherical core and the core print of air incrustation inner chamber are made, the core material in spherical core and core print is selected
Alkali phenol resin sand, makes corresponding fix bar simultaneously；
1.4) one heat insulating open riser is set on air incrustation top；
1.5) chill at setting two at air incrustation opening, is chill two at one, is chill one, and arranges at one
Reasonable clearance；
1.6) two-layer a cast runner is installed；
1.7) draw craft drawing；
Step 2, enforcement casting
2.1) press art work sheet, make the entity apperance of air incrustation, make the wood of spherical core and core print simultaneously
Core box；
2.2) press art work sheet, by the entity made apperance, heat insulating open riser, chill one, chill two and a cast runner
Moulding respectively in drag box and cope, moulding sand adopts alkali phenol resin sand, should consolidate molding sand during moulding, detects molding sand
Room temperature comprcssive strength should be greater than 2.0mpa, after molding sand self-hardening, take out entity apperance formed die cavity；
2.3) press art work sheet, make spherical core and core print, first process core skeleton, core skeleton mobile jib adopts steel
Pipe, welds annulus by art work sheet status requirement on core skeleton and is used for installing the fix bar of spherical core and core print, then root
Shape according to core box uses reinforcement welding many places reinforced support on core skeleton, is wound around grass before coremaking on core skeleton mobile jib
Rope, it is unobstructed to ensure steam vent to put aerofluxuss rope, during coremaking, ready-made core skeleton is placed on correct position in core box；
2.4) stenciling coating, brushes ready-made die cavity and spherical core and core print；
2.5) mould assembling；
2.6) sand mold baking, molding sand is dried before cast, terminates to dry when cast；
2.7) pour into a mould；
2.8) unpack；
2.9) sandblasting, carries out sandblasting to air incrustation；
2.10) polish and repair；
2.11) normalized treatment, carries out high temperature normalizing process to air incrustation, and normalizing temperature controls 900 DEG C～930
DEG C, time control is 5～6 hours；
2.12) secondary sandblasting, carries out secondary sandblasting to air incrustation,.
The invention has the beneficial effects as follows, using the life of the casting air incrustation of alkali phenol resin sand and special process method
Product method, casting air incrustation outer wall allowance carries out process optimization setting using solidification simulation cae software, and by real
Border produces checking and seeks the most rational outer surface of outer cover allowance；The cold of two kinds of different sizes is set at shell big opening end
Ferrum, reaches suitable chill effect, enables the purpose of consecutive solidification during solidification of molten steel；This casting air incrustation interior tissue
Densification, the blank inside and outside wall equal flawless of flaw detection, inwall is non-processing surface, and surface quality and dimensional accuracy have reached setting and wanted
Ask, thoroughly solve the technical barrier of inwall processing difficulties, reduce production cost, have good application value.
Brief description
Fig. 1 is the perspective view of the inventive method air incrustation to be made；
Fig. 2 is the sectional view of Fig. 1；
Fig. 3 is the sectional view after the inventive method arranges allowance；
Fig. 4 is the technological principle schematic diagram that the inventive method casting method adopts；
Fig. 5 is the entity appearance schematic diagram with air incrustation for the moulding of the inventive method；
Fig. 6 is auxiliary device assembling structure schematic diagram during the inventive method casting；
Fig. 7 is the mplifying structure schematic diagram of fix bar 10 in Fig. 6.
In figure, 1. air incrustation, 2. allowance layer, 3. heat insulating open riser, 4. a cast runner, 5. chill one is 6. cold
Ferrum two, 7. spherical core and core print, 8. core skeleton, 9. straw rope and aerofluxuss rope, 10. fix bar, 11. steam vents, 12. times sand
Case, 13. molding sand, 14. die joints, 15. copes, 16. entity apperances.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings and detailed description.
With reference to Fig. 1, Fig. 2, it is the structural representation of present invention pressure-bearing to be produced mud pump air incrustation blank,
It is directly the compact dimensions of air incrustation 1.
With reference to Fig. 3, it is the sectional view after the inventive method arranges allowance, outside the compact dimensions of air incrustation 1
Also leave allowance layer 2.
With reference to Fig. 4, the casting technique principle of the air incrustation of the inventive method is: is entered using spheroid core and core print 7
Typing in the middle of row, makes the opening of air incrustation 1 down, is conducive to core setting and fixes, using two kinds of chill (chills one
5th, chill 2 6) accelerate opening (end) cooling, air incrustation 1 top setting heat insulating open riser 3 increase molten steel feeding effect
Really, a cast runner 4 adopts two-layer ladder integrated cast structure to arrange, and is conducive to reaching the mesh of consecutive solidification during air incrustation 1 solidification
's.
With reference to Fig. 5, it is the entity apperance outline drawing with air incrustation for the moulding of the inventive method: entity apperance 16 is optional
Select timber or plastic production, from mid diameter maximum typing, entity apperance 16 is used for forming the die cavity of molding sand 13.
With reference to Fig. 6, the die cavity manufacturing process that the inventive method adopts in casting air incrustation production process is, including
Entity apperance 16 is placed in the middle of drag box 12 on the basis of die joint 14 and cope 15, drag box 12 and cope 15, real
Body apperance is connected to heat insulating open riser 3, a cast runner 4, chill 1 and chill 26 about 16, chill 1 is along entity mould
Sample 16 opening periphery is arranged, and chill 26 is arranged along opening lower surface；Filled-type in drag box 12 and cope 15
Sand 13 simultaneously consolidates, and after molding sand 13 self-hardening of drag box 12 and cope 15, takes out entity apperance 16 and forms die cavity.
The manufacturing process of spherical core and core print 7 is that spherical core and core print 7 lower end are provided with steam vent 11 and lead to lower sand
Outside type 12, preset straw rope and aerofluxuss rope 9 in the middle of spherical core and core print 7, be also arranged core skeleton 8, core skeleton 8
Lower end be connected with fix bar 10, fix bar 10 is to carry out caring for fixation to spherical core and core print 7, prevents steel during cast
Liquid produces buoyancy and causes the casting flaw of core floatation to spherical core and core print 7, sees Fig. 7.
Spherical core and core print 7 are placed in the die cavity that molding sand 13 is formed, mould assembling simultaneously fixes spherical core and core print 7.
In sum, the pressure-bearing of the present invention casting method of mud pump air incrustation, using above-mentioned auxiliary device, presses
Implement according to following steps:
Step 1, technique setting
1.1) consider that core print is easy to operate when fixing, select the typing scheme of the big mouth down of air incrustation 1, see Fig. 3, figure
Die joint 14 in 4；
1.2) structure according to air incrustation 1, by computer solidification simulation software to air incrustation 1 spherical outside surface
Allowance layer 2 is optimized setting so as to reach the purpose of preferable consecutive solidification；
1.3) spherical core and the core print 7 of air incrustation 1 inner chamber are made, core material selects alkali phenol resin sand, core
Head length and gap determine according to related GB, make corresponding fix bar 10 simultaneously；
1.4) according to modular approach or other computational methods, one big heat insulating open riser is set on air incrustation 1 top
3, in embodiment, the size of heat insulating open riser 3 is φ 300 × 600mm；
1.5) chill at setting two at air incrustation 1 opening, is δ=40mm bottom surface whole circle chill 26 at one, one
Locate the outer ring chill 1 for δ=30mm height 70mm, reasonable clearance is set；
1.6) two-layer a cast runner 4 is installed, lower floor is that the twice ingate of φ 50mm (illustrates reality for 2 with arrow in Fig. 4
Road), upper strata is the ingate that φ 70mm leads directly to heat insulating open riser 3, and vertical main running channel is φ 70mm, the duration of pouring is 55～
70s；
1.7) draw craft drawing；
Step 2, enforcement casting:
2.1) press the art work sheet determining, make the entity apperance 16 of air incrustation 1, make spherical core and core simultaneously
7 wood core box；
2.2) press art work sheet, by the entity made apperance 16, heat insulating open riser 3, chill 1, chill 26 and cast
Runner 4 moulding respectively in drag box 12 and cope 15, moulding sand adopts alkali phenol resin sand, should smash molding sand 13 during moulding
Real, the room temperature comprcssive strength of detection molding sand 13 should be greater than 2.0mpa, after molding sand 13 self-hardening, takes out entity apperance 16 formation type
Chamber；
2.3) press art work sheet, make spherical core and core print 7, first process core skeleton 8, arbor mobile jib adopts φ 40mm
Steel pipe, welds φ 40mm annulus by art work sheet status requirement on arbor and is used for installing the fix bar 10 of core, further according to core
The shape of box on arbor with the reinforcement welding many places reinforced support of φ 8mm to increase the intensity of core, in arbor master before coremaking
It is wound around straw rope on bar, put aerofluxuss rope unobstructed to ensure core steam vent 11, by ready-made arbor placement core box during coremaking
Interior correct position；
2.4) stenciling coating, using manual brushing, is applied with the zirconium English powder ethanol quick drying paint that resin sand is commonly used using cast steel
Brush ready-made die cavity and spherical core and core print 7, brush 3～4 times；
2.5) mould assembling, the fix bar 10 of the carbon steel material according to a piece φ 20mm of art work sheet pre-production is standby, under
First have to during core clean out the steam vent of the molding sand 13 after hardening, with joint sealing mud bar, steam vent 11 is fixed on core apertures circle
Including, then it is wound around 4 circles with asbestos cord at spherical core and core print 7 core print outer wall, then by the spherical core made and core
7 are placed in the die cavity made, and are fixed core with bolt with fix bar 10 after mixing up position on drag box 12 bottom, cleaning
The clean residual sand of die cavity, finally fastens cope 15 fixing reliability；
2.6) molding sand 13 is dried after mould assembling, hot-air blower temperature control before cast by sand mold baking using hot-air blower
At 150 DEG C, terminate to dry when cast；
2.7) pour into a mould, pouring temperature controls at 1570 DEG C～1590 DEG C, and the duration of pouring controls at 1 minute, during cast first from
Inject molten steel at the upper end cup of a cast runner 4, first quick and back slow, wait molten steel to rise to heat insulating open riser 3 about 1/3～1/2
When highly locating, stop cast, add heat preserving agent in heat insulating open riser 3, be changed to pour into a mould from heat insulating open riser 3, pour full after point again
Pour 2～3 times；
2.8) unpack, unpack within 35～40 hours after cast, using shake-out, by air incrustation 1 surface and inwall
Clean, cutting heat insulating open riser 3 and a cast runner 4 while hot is removed in scab, and during cutting, temperature control is at 200 DEG C～250 DEG C；
2.9) sandblasting, carries out sandblasting to air incrustation 1；
2.10) polish and repair；
2.11) normalized treatment, carries out high temperature normalizing process to air incrustation 1, and normalizing temperature controls 900 DEG C～930
DEG C, time control is 5～6 hours；
2.12) secondary sandblasting, carries out secondary sandblasting to air incrustation 1,.
In subsequent technique, magnetic powder inspection is carried out to blank, if qualified, send library storage, if unqualified, according to circumstances repair
Multiple.
In the above-mentioned step of the inventive method, have following some pay particular attention to:
1) carry out process optimization using solidification simulation cae software to arrange and verify by actual production, the sky of reasonable
Gas bag shell 1 outer surface allowance, to realize the purpose of consecutive solidification.
2) chill of two kinds of different sizes is set at the opening of air incrustation 1, reaches suitable chill effect.
3) to be reached using higher heat insulating open riser 3 increases the effect of pressure head；
4) adopt two-layer ladder running channel, lower floor uses twice flat mouth duck mouth pipe brick, upper strata emits using connector bend brick is logical
Mouthful.During cast, pouring temperature controls at 1570 DEG C～1590 DEG C, and the duration of pouring controls at 1 minute about, first from a cast runner 4
Upper end cup at inject molten steel, first quick and back slow, when molten steel rises at heat insulating open riser 3 about 1/3～1/2 height,
Stop cast, add heat preserving agent in heat insulating open riser 3, be changed to pour into a mould from heat insulating open riser 3, hole irrigation 2～3 times again after pouring completely；
5) mitigate core weight using straw rope in spherical core and core print 7 center portion during coremaking and reach beneficial to sand after pouring into a mould
Core has preferable deformability and venting quality, reduces blank defect.
6) adopt alkali phenolic resin sand molding process, this resin sand heat-insulating property is good, and foundry goods and rising head can be made long-time
It is in liquid high temperature state, good feeding effect can be reached, to form compact tissue.
Embodiment
Make kb-75 air incrustation, figure number ak753501-0301b1.
The test first stage produces a collection of totally 5, serial number 1301x, 1302x, 1303x, 1304x, 1305x, wherein
1304x, 1305x two pieces is dissected, and inner surface carries out magnetic powder and ultrasonic examination, report number of detecting a flaw: bomco j69-
Mt-be027-1306, bomco j68-ut-be018-1306 result of detection: all qualified.And metallographic structure is tested, heat
Process is organized as: tempered sorbite+upper bainite, grain size: 8 grades；Cast sturcture: pearlite+ferrite net+bulk ferrum element
Body, grain size is more than 1 grade, and after field trash a1.5, d1.0. remaining 3 is processed, flaw detection is all qualified.
In test second stage, produce kb-75 air incrustation totally 180, processing survives a flaw detection qualification rate and reaches
99%, water filling static pressure test qualification rate 100%, reach expected setting requirements.
It can be seen that, the pressure-bearing mud pump air incrustation foundry goods that the inventive method makes, inner wall size precision reaches setting
Require, machining need not be carried out, solve the problems, such as inwall processing difficulties, save production cost, be fully able to replace forging
Make air incrustation.
Claims (6)
1. a kind of pressure-bearing with the casting method of mud pump air incrustation it is characterised in that according to following steps implement:
Step 1, technique setting
1.1) select the typing scheme of the big mouth down of air incrustation (1)；
1.2) structure according to air incrustation (1), is optimized to the allowance layer (2) of air incrustation (1) spherical outside surface
Setting；
1.3) spherical core and the core print (7) of air incrustation (1) inner chamber, the core material in spherical core and core print (7) are made
Alkali phenol resin sand selected by material, makes corresponding fix bar (10) simultaneously；
1.4) one heat insulating open riser (3) is set on air incrustation (1) top；
1.5) chill at setting two at air incrustation (1) opening, is chill two (6) at one, is chill one (5) at one,
And reasonable clearance is set；
1.6) two-layer a cast runner (4) is installed；
1.7) draw craft drawing；
Step 2, enforcement casting
2.1) press art work sheet, make the entity apperance (16) of air incrustation (1), make spherical core and core print (7) simultaneously
Wood core box；
2.2) press art work sheet, by the entity made apperance (16), heat insulating open riser (3), chill one (5), chill two (6) and
A cast runner (4) moulding respectively in drag box (12) and cope (15), moulding sand adopts alkali phenol resin sand, should during moulding
Molding sand (13) is consolidated, the room temperature comprcssive strength of detection molding sand (13) should be greater than 2.0mpa, after molding sand (13) self-hardening, take out
Entity apperance (16) forms die cavity；
2.3) press art work sheet, make spherical core and core print (7), first processing core skeleton (8), core skeleton (8) mobile jib is adopted
With steel pipe, core skeleton (8) welds annulus by art work sheet status requirement and is used for installing consolidating of spherical core and core print (7)
Fixed pole (10), the shape further according to core box above uses reinforcement welding many places reinforced support in core skeleton (8), in core bone before coremaking
It is wound around straw rope on frame (8) mobile jib, put aerofluxuss rope unobstructed to ensure steam vent (11), by ready-made core skeleton during coremaking
(8) it is placed on correct position in core box；
2.4) stenciling coating, brushes ready-made die cavity and spherical core and core print (7)；
2.5) mould assembling；
2.6) sand mold baking, molding sand (13) is dried before cast, terminates to dry when cast；
2.7) pour into a mould；
2.8) unpack；
2.9) sandblasting, carries out sandblasting to air incrustation (1)；
2.10) polish and repair；
2.11) normalized treatment, carries out high temperature normalizing process to air incrustation (1), and normalizing temperature controls at 900 DEG C～930 DEG C,
Time control is 5～6 hours；
2.12) secondary sandblasting, carries out secondary sandblasting to air incrustation (1),.
2. pressure-bearing mud pump air incrustation according to claim 1 casting method it is characterised in that: described pours
Beam road (4) is two-layer, and including vertical main running channel, lower floor is twice ingate, and upper strata is the interior of straight-through heat insulating open riser (3)
Running channel.
3. pressure-bearing according to claim 1 with the casting method of mud pump air incrustation it is characterised in that: described step
In rapid 2.5), standby according to piece fix bar (10) of art work sheet pre-production, during lower core,
First, the steam vent (11) of the molding sand (13) after hardening is cleaned out, with joint sealing mud bar, steam vent (11) is fixed on
Within spherical core and core print (7) hole circle, at spherical core and core print (7) core print outer wall, it is wound around 4 circles with asbestos cord；
Then, the spherical core made and core print (7) are placed in the die cavity made, after mixing up position, use fix bar (10)
Will be fixing on drag box (12) bottom to spherical core and core print (7), clean out the residual sand of die cavity, finally fasten cope (15) and
It is fixed.
4. pressure-bearing according to claim 1 with the casting method of mud pump air incrustation it is characterised in that: described step
In rapid 2.7), pouring temperature controls at 1570 DEG C～1590 DEG C, and the duration of pouring controls at 1 minute, first from a cast runner during cast
(4) inject molten steel at upper end cup, first quick and back slow, when waiting molten steel to rise at heat insulating open riser (3) highly 1/3～1/2,
Stop cast, add heat preserving agent in the heat insulating open riser (3), be changed to pour into a mould from heat insulating open riser (3), pour full after hole irrigation 2～3 again
Secondary.
5. pressure-bearing according to claim 1 with the casting method of mud pump air incrustation it is characterised in that: described step
In rapid 2.8), unpack within 35～40 hours after cast, shake-out, cutting heat insulating open riser (3) and a cast runner (4), cut while hot
When cutting, temperature control is at 200 DEG C～250 DEG C.
6. pressure-bearing according to claim 1 with the casting method of mud pump air incrustation it is characterised in that: described is cold
Ferrum one (5) is arranged along entity apperance (16) opening periphery, and chill two (6) is arranged along opening lower surface.
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| CN201823891U (en) * | 2010-09-07 | 2011-05-11 | 江苏金石铸锻有限公司 | Air case |
| JP5937419B2 (en) * | 2012-05-07 | 2016-06-22 | 幡豆工業株式会社 | Mold mold manufacturing method |
| CN102921899B (en) * | 2012-10-23 | 2014-04-16 | 宝鸡石油机械有限责任公司 | Method for casting U-shaped lifting ring steel casting |
| CN103624218B (en) * | 2013-10-25 | 2016-03-02 | 宝鸡石油机械有限责任公司 | A kind of casting method of hollow crankshaft of slurry pump |
| CN103506580B (en) * | 2013-10-30 | 2016-02-10 | 宜昌船舶柴油机有限公司 | The casting method of large-scale thin-wall valve body steel-casting |
| CN203830624U (en) * | 2014-05-12 | 2014-09-17 | 莱芜锻压有限公司 | Forging die for mud pump air bag blank |
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