CN102921899B - Method for casting U-shaped lifting ring steel casting - Google Patents
Method for casting U-shaped lifting ring steel casting Download PDFInfo
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- CN102921899B CN102921899B CN201210406120.2A CN201210406120A CN102921899B CN 102921899 B CN102921899 B CN 102921899B CN 201210406120 A CN201210406120 A CN 201210406120A CN 102921899 B CN102921899 B CN 102921899B
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Abstract
The invention discloses a method for casting a U-shaped lifting ring steel casting. A large open riser is arranged at the thickest position of the U-shaped casting; two small risers are arranged at the pored tail end; a contoured densener is arranged at the tail end; a riser allowance is arranged on the upper surface; horizontal molding is adopted, and a sand box is inclined 10 to 13 degrees after being closed, so that the large open riser is arranged at the highest position of the casting; during production, pouring temperature is strictly controlled, pouring speed is gradually reduced, pouring is stopped when a position which is one third to a half of the large open riser is poured, a heat preservation agent is added into the large open riser, the large open riser is poured and subjected to point pouring for two to three times, and temperature and time are strictly controlled in subsequent high temperature normalizing treatment. By the method, molten steel is saved, convenience is provided for model making and molding processes, the produced lifting ring blank is qualified, and quality is ensured.
Description
Technical field
The invention belongs to plant equipment preparing technical field, relate to a kind of casting method of U-shaped drop handle class steel-casting.
Background technology
Drop handle is lifting part (blank is steel-casting) important on oil-well rig hoisting system, belong to low-alloy cast steel part, part technical requirement comprises: 1. cast(ing) surface carries out magnetic powder inspection, should meet in APASPEC 8C < < drilling well and oil recovery lifting means standard > > the regulation of 8.4.7 article, and reach PSL1 level quality requirement; 2. finished surface carries out ultrasonic examination, should meet in APA SPEC 8C < < drilling well and oil recovery lifting means standard > > the regulation of 8.4.8 article, and reach PSL1 level quality requirement.3. annulus endoporus place, drop handle two ends carries out dye penetrant inspection, should meet the regulation of GB9443-88 standard B level.
The similar U font of drop handle profile, material belongs to low-alloy cast steel part, cross section is similar to square (0.8≤Kuan Hou Bi≤1.2), belong to typical U-shaped shaft-like steel-casting, shaft-like casting steel casting scheme routinely: generally adopt horizontal parting, horizontal moulding, casting on flat, adopt modular approach to calculate rising head size according to thermal center size, according to feeding distance, rising head quantity or chill are set again, as the two schemes of Fig. 3 and Fig. 5.The drop handle that this two schemes is cast out, through ultrasonic examination, detecting, find that the core between drop handle rising head exists internal structural flaw in a big way, also there is detection defects around in two holes, one time flaw detection qualification rate is almost nil, has a strong impact on product quality.Therefore, the casting technique of studying new solution prior art and casting the heart portion of U-shaped drop handle and exist tissue defects is imperative.
Summary of the invention
The object of this invention is to provide a kind of casting method of U-shaped drop handle class steel-casting, there is tissue defects in the shaft-like steel-casting ultrasonic examination of the U-shaped drop handle class heart portion in prior art that solved, affects the problem of flaw detection qualification rate.
The technical solution adopted in the present invention is, a kind of casting method of U-shaped drop handle class steel-casting is implemented according to following steps:
Step 1, technique position is set
1.1) drop handle adopts the middle somatotype of level;
1.2) in drop handle upper and lower surface and two circular hole internal circular surfaces, add corresponding allowance;
1.3) at two circular hole places, core and core print are set, at the circular arc place of two ends of drop handle, one lacing wire are set;
1.4) a large open riser is set in drop handle thickness;
1.5) at each circular hole place, a little rising head is set;
1.6) at drop handle end region bottom surface, a contoured chill B is set respectively;
1.7) rising head that is provided with an integral form in drop handle upper surface is subsidized;
1.8) the apparatus for pouring B of installation notch cuttype;
2.1), by above-mentioned technique setting, make model and the core box of drop handle;
2.2) in model and core box, install large open riser, little rising head, apparatus for pouring B and contoured chill B;
2.3) stenciling coating, is used the conventional zirconium English powder alcohol quick drying paint brushing die cavity of cast steel furan resin-sand 3 ~ 4 times;
2.4) mould assembling, and the sandbox getting togather is tilted 10 ° ~ 13 °, make large open riser at foundry goods peak place;
2.5) cast, pouring temperature is controlled at 1570 ℃ ~ 1600 ℃, first from apparatus for pouring B, pours into a mould, during cast, first quick and back slow, wait to water to large open riser approximately during 1/3 ~ 1/2 place, to stop cast, in large open riser, add heat preserving agent, change into from large open riser cast, water completely rear hole irrigation 2～3 times;
2.6) unpack, after 8 ~ 12 hours, unpack, adopt shake-out, the scab to drop handle surface and contoured chill B are clean with mechanical removal, and then cut large open riser, little rising head, rising head subsidy and apparatus for pouring B open.
The invention has the beneficial effects as follows, adopting U-shaped drop handle thickness (being circular arc place) that large open riser, an end are set arranges and between little rising head, rising head, adds the founding method that subsidy, end adopt inclined casting to combine when chill, cast are set, strict pouring temperature, pouring procedure and the normalized treatment temperature and time controlled during produced on-site.The application of the method has thoroughly solved the shaft-like steel-casting ultrasonic examination of U-shaped drop handle class heart portion and has existed the problem of tissue defects.Saved molten steel, again for modelling and modeling process facilitate, the drop handle blank of producing is qualified simultaneously, has guaranteed the quality of petroleum drilling and mining trip crane system key component.
Accompanying drawing explanation
Fig. 1 is the drop handle structural representation that the inventive method will be cast;
Fig. 2 is the side view of Fig. 1;
Fig. 3 is the drop handle founding method one that prior art adopts;
Fig. 4 is the level sectional view of Fig. 3;
Fig. 5 is the drop handle founding method two that prior art adopts;
Fig. 6 is the level sectional view of Fig. 5;
Fig. 7 is the drop handle founding method three that the inventive method adopts;
Fig. 8 is the level sectional view of Fig. 7.
In figure, 1. drop handle, 2. circular hole, 3. lacing wire, 4. insulated feeder A, 5. apparatus for pouring A, 6. core and core print, 7. insulated feeder B, 8. insulated feeder C, 9. square chill A, 10. large open riser, 11. little rising heads, 12. rising head subsidies, 13. apparatus for pouring B, 14. contoured chill B.
The specific embodiment
With reference to Fig. 1, Fig. 2, be the casting method of U-shaped drop handle class steel-casting of the present invention, the structural representation of the drop handle 1 that make, the end of 1 two elbows of drop handle is respectively arranged with a circular hole 2.
With reference to Fig. 3, Fig. 4, be the drop handle founding method one of the employing of prior art: adopt horizontal moulding, casting on flat, arrange apparatus for pouring A5 is installed, on drop handle 1, the identical insulated feeder A 4 of uniform 4 sizes, arranges lacing wire 3, and circular hole 2 places arrange core and core print 6.
With reference to Fig. 5, Fig. 6, the drop handle founding method two that prior art adopts: adopt horizontal moulding, casting on flat, two circular hole 2 places are respectively arranged with an insulated feeder C 8 that size is identical, middle thickness (being circular arc waist place) arranges a larger insulated feeder B 7, and insulated feeder B 7 and two insulated feeder C 8 middle parts are respectively arranged with a square chill A 9(and are positioned over drop handle 1 bottom surface place).
With reference to Fig. 7, Fig. 8, be the casting method of U-shaped drop handle class steel-casting of the present invention, the technique setting of its drop handle casting and making overall process, according to following steps, implement:
Step 1, technique position is set
1.1) consider that moulding and modelling are convenient, somatotype in the middle of drop handle 1 employing level;
1.2), according to the relevant regulations of Chinese national standard, at drop handle 1 upper and lower surface and two circular hole 2 internal circular surfaces of needs processing, add corresponding allowance;
1.3) at two circular hole 2 places, core and core print 6 are set, at the circular arc place of 1 two ends of drop handle, one lacing wire 3 are set, while preventing from solidifying, deform, affect the location dimension size between two circular holes 2;
1.4) according to modular approach or other computational methods, in drop handle 1 thickness (being circular arc waist place) a large open riser 10(is set is the large oval open riser in top);
1.5) drop handle 1 end is prone to detection defects owing to affected by two circular holes 2, and therefore i.e. two the little oval insulated feeders of a little rising head 11(are set at each circular hole 2 places);
1.6) in order to accelerate drop handle 1 end region, first solidify, reach the object of desirable consecutive solidification, at drop handle 1 end region bottom surface, a contoured chill B 14 is set respectively, the length dimension of this contoured chill B 14 be from drop handle 1 least significant end in drop handle 1 length direction 1/3 ~ 1/2 scope, the thickness of this contoured chill B 14 is 1/3 ~ 1/2 of drop handle 1 thickness, profile is suitable with drop handle edge, as Fig. 7, Fig. 8;
1.7) in order to increase the feeding effect of large open riser 10, in drop handle 1 upper surface, be provided with the rising head subsidy 12 of an integral form, the width of rising head subsidy 12 is compared with the drop handle 1 little 3 ~ 5mm in the every limit of width, and the length of rising head subsidy 12 is traversed drop handle 1 upper surface, and size, particular location and shape are as Fig. 8;
1.8) the apparatus for pouring B 13 of installation notch cuttype, as Fig. 7, Fig. 8;
2.1), by technological design drawing, make model (subsidy of band rising head and lacing wire) and the core box of drop handle 1;
2.2) moulding, adopts horizontal moulding, strictly, by technological requirement, installs large open riser 10, little rising head 11, apparatus for pouring B 13 and contoured chill B 14 in model and core box;
2.3) stenciling coating, adopts manual brushing, uses the zirconium English powder alcohol quick drying paint brushing die cavity 3 ~ 4 times that cast steel furan resin-sand is conventional;
2.4) mould assembling, and the sandbox getting togather is tilted 10 ° ~ 13 ° (strictly controlling), notice that large open riser 10 must be at foundry goods peak place;
2.5) cast, pouring temperature is 1570 ℃ ~ 1600 ℃, first from apparatus for pouring B 13, pours into a mould, during cast, first quick and back slow, while waiting 1/3 ~ 1/2 place of watering to large open riser 10, stop cast, in large open riser 10, add heat preserving agent, change into from large open riser 10 and pouring into a mould, water completely rear hole irrigation 2～3 times;
2.6) unpack, after 8 ~ 12 hours, unpack, adopt shake-out, the scab to drop handle 1 surface and contoured chill B 14 use mechanical removals are clean, and then cut all rising heads, rising head subsidy 12 and apparatus for pouring B 13 open.
3.1) sandblast, carries out sandblast (polish and repair) to drop handle 1;
3.2) normalized treatment, carries out high temperature normalizing processing to drop handle 1, and normalizing temperature is controlled at 900 ℃ ~ 930 ℃, and time control is 3 ~ 6 hours;
3.3) secondary sandblast, re-starts sandblast to drop handle 1; Drop handle 1 is carried out to roughing.
Embodiment 1
Make DG675 hook drop handle, figure number AC675001-04, production sequence numbers 1109, flaw detection report number: Q/BOMCO J68-UT-BE012-2012, result of detection: qualified.
Make DG450 hook drop handle, figure number AC315003-01, production sequence numbers 1131,1132,1134 totally 3, flaw detection report number: Q/BOMCO G04.47-ZJ-E16-2011-11, result of detection: all qualified.
Make DG315 hook drop handle, figure number AC315003-01, production sequence numbers 1133, a collection of totally 2, flaw detection report number: Q/BOMCO J68-UT-BE014-2012, result of detection: all qualified.
Production sequence numbers 1112,1106,1064,1102,1113,1108,1103,1110,1107 totally 9, flaw detection report number: Q/BOMCO G04.77-ZJ-E09-2011-11, result of detection: all qualified.
The U-shaped shaft-like steel-casting drop handle that the inventive method is made, adopt a kind of scheme that adds chill and increase rising head subsidy of tiltedly watering, mainly comprise sandbox angle of inclination, chill shape and size, rising head subsidy shape and size, rising head type, size and quantity etc. are set, strict pouring temperature, pouring procedure and the normalized treatment temperature and time etc. controlled during production, blank flaw detection qualification rate is reached more than 98%, thoroughly solved the analog-U shaped shaft-like low-alloy cast steel part ultrasonic wave of drop handle and visit heart portion and exist the technical barrier of tissue defects.
Claims (3)
1. a casting method for U-shaped drop handle class steel-casting, is characterized in that, according to following steps, implements:
Step 1, technique position is set
1.1) somatotype in the middle of drop handle (1) employing level;
1.2) in drop handle (1) upper and lower surface and two circular holes (2) internal circular surfaces, add corresponding allowance;
1.3) at two circular holes (2), locate to arrange core and core print (6), at the circular arc place of (1) two end of drop handle, one lacing wire (3) is set;
1.4) in drop handle (1) thickness, a large open riser (10) is set;
1.5) at each circular hole (2), locate to arrange a little rising head (11);
1.6) at drop handle (1) end region bottom surface, a contoured chill B(14 is set respectively);
1.7) rising head that is provided with an integral form in drop handle (1) upper surface is subsidized (12);
1.8) the apparatus for pouring B(13 of installation notch cuttype);
Step 2, enforcement casting:
2.1), by above-mentioned technique setting, make model and the core box of drop handle (1);
2.2) in model and core box, install large open riser (10), little rising head (11), apparatus for pouring B(13) and contoured chill B(14);
2.3) stenciling coating, is used the conventional zirconium English powder alcohol quick drying paint brushing die cavity of cast steel furan resin-sand 3 ~ 4 times;
2.4) mould assembling, and the sandbox getting togather is tilted 10 ° ~ 13 °, and make large open riser (10) at foundry goods peak place;
2.5) cast, pouring temperature is controlled at 1570 ℃ ~ 1600 ℃, first from apparatus for pouring B(13) pour into a mould, during cast first quick and back slow, when watering to large open riser (10) 1/3 ~ 1/2 place, stop cast, in large open riser (10), add heat preserving agent, change into from large open riser (10) cast, water completely rear hole irrigation 2～3 times;
2.6) unpack, after 8 ~ 12 hours, unpack, adopt shake-out, to scab and the contoured chill B(14 on drop handle (1) surface) clean with mechanical removal, and then cut large open riser (10), little rising head (11), rising head subsidy (12) and apparatus for pouring B(13 open).
2. the casting method of U-shaped drop handle class steel-casting according to claim 1, it is characterized in that, described step 1.6) in, described contoured chill B(14) length dimension be from drop handle (1) least significant end in 1/3 ~ 1/2 scope of drop handle (1) length direction, this contoured chill B(14) thickness be 1/3 ~ 1/2 of drop handle (1) thickness, profile is suitable with drop handle edge.
3. the casting method of U-shaped drop handle class steel-casting according to claim 1, it is characterized in that, described step 1.7) in, the width of described rising head subsidy (12) is compared with drop handle (1) the width little 3 ~ 5mm in every limit, and the length of rising head subsidy (12) is traversed drop handle (1) upper surface.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210406120.2A CN102921899B (en) | 2012-10-23 | 2012-10-23 | Method for casting U-shaped lifting ring steel casting |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210406120.2A CN102921899B (en) | 2012-10-23 | 2012-10-23 | Method for casting U-shaped lifting ring steel casting |
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| CN102921899A CN102921899A (en) | 2013-02-13 |
| CN102921899B true CN102921899B (en) | 2014-04-16 |
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| CN201210406120.2A Expired - Fee Related CN102921899B (en) | 2012-10-23 | 2012-10-23 | Method for casting U-shaped lifting ring steel casting |
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| CN103273004B (en) * | 2013-05-15 | 2016-08-10 | 英山华茂船舶舾装设备有限公司 | Anchor chain casting mould and casting method |
| CN103273046A (en) * | 2013-06-06 | 2013-09-04 | 徐州市旭龙铸锻机械有限公司 | Casting directional solidification process |
| CN105328128B (en) * | 2014-08-08 | 2017-07-11 | 上海电气上重铸锻有限公司 | Preparation method for casting the suspender belt core of supercritical turbine cylinder |
| CN104722718B (en) * | 2015-03-13 | 2017-01-18 | 宝鸡石油机械有限责任公司 | Casting method of mud pump air dome shell for bearing pressure |
| CN106623778A (en) * | 2016-11-30 | 2017-05-10 | 安徽应流集团霍山铸造有限公司 | Method for solving sand mould big-sized plate casting top surface porosity scabs |
| CN112247069A (en) * | 2020-08-25 | 2021-01-22 | 常熟市虹桥铸钢有限公司 | Casting method of lower casting of gearless electric propeller hull |
| CN112605346B (en) * | 2020-11-30 | 2022-10-04 | 宝鸡石油机械有限责任公司 | Casting method of hook body for hook of ultra-deep well petroleum drilling rig hoisting system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61189842A (en) * | 1985-02-15 | 1986-08-23 | Atsugi Motor Parts Co Ltd | Gravity metal mold |
| CN101618426A (en) * | 2009-07-25 | 2010-01-06 | 宁波明灵机械有限公司 | Method for casting main shaft casts of stators in aerogenerators |
| KR20110047297A (en) * | 2009-10-30 | 2011-05-09 | 덕지산업주식회사 | Molding method for a Boss part of a Casting |
| CN202343867U (en) * | 2011-11-11 | 2012-07-25 | 株洲九方铸造有限责任公司 | Wheel core casting die |
-
2012
- 2012-10-23 CN CN201210406120.2A patent/CN102921899B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61189842A (en) * | 1985-02-15 | 1986-08-23 | Atsugi Motor Parts Co Ltd | Gravity metal mold |
| CN101618426A (en) * | 2009-07-25 | 2010-01-06 | 宁波明灵机械有限公司 | Method for casting main shaft casts of stators in aerogenerators |
| KR20110047297A (en) * | 2009-10-30 | 2011-05-09 | 덕지산업주식회사 | Molding method for a Boss part of a Casting |
| CN202343867U (en) * | 2011-11-11 | 2012-07-25 | 株洲九方铸造有限责任公司 | Wheel core casting die |
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