CN100369697C - Method for casting cast steel intermediate product of diesel engine - Google Patents
Method for casting cast steel intermediate product of diesel engine Download PDFInfo
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- CN100369697C CN100369697C CNB2005100197383A CN200510019738A CN100369697C CN 100369697 C CN100369697 C CN 100369697C CN B2005100197383 A CNB2005100197383 A CN B2005100197383A CN 200510019738 A CN200510019738 A CN 200510019738A CN 100369697 C CN100369697 C CN 100369697C
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Abstract
The present invention discloses method for casting a cast steel intermediate product of a diesel engine and belongs to the technical field of casting. The present invention adopts a seamless steel tube which has a thick wall, and the seamless steel tube is made into two wind cooling core bars which penetrate through a screw bolt hole. Before a casting mold is cast, or when the casting mold is cast, compressed air is inputted for cooling, which prevents adhering sand and sand cores from being sintered. The yield rate of castings is high. A mode that a riser and an external chill matched with the riser are combined is adopted to realize the directional solidification of the castings and prevent thermal cracks from being generated. The cross lacing wire technology is adopted to control an opening distance, prevent an intermediate product from being deformed, and ensure the product quality. A nondefective good cast steel intermediate product of a diesel engine can be produced.
Description
Technical field
The present invention relates to a kind of manufacture method that is used for the foundry goods of diesel engine, particularly a kind of casting method of diesel engine cast steel intermediate.
Background technology
Diesel engine cast steel intermediate is one of critical component of marine low-speed high-power diesel engine.Intermediate through bolt hole belongs to elongated hole, and the elongated hole casting is a difficult problem of Foundry Production always.Name is called " casting method with profound through hole steel-casting ", application number is 02145014.5 application for a patent for invention, a kind of casting method with profound through hole steel-casting is disclosed, its method is to adopt thick-walled seamless steel pipes to make the water-cooled arbor, and during casting-up or cast back is by water-cooled arbor water flowing cooling.Weak point is: water resource waste is serious, has increased cost.
The intermediate wall thickness differs bigger, foundry goods produces bigger shrinkage stress in process of setting, be easy to generate fire check, particularly at arc transition place, through bolt pipe both sides, be through bolt pipe and welded plate circular arc junction and through bolt pipe and middle pectoral plate circular arc junction, produce more serious fire check.Prior art is to strengthen this place's fillet, and control pouring molten steel temperature and the whole deformability of raising sand mold reduce shrinkage stress, reduce the generation of crackle.But because this place is heat energy-saving position, solidify laterly,, produce shrinkage cavity, shrinkage porosite, form formation of crack in the centre if can not get the feeding of molten steel; On the other hand, this place is easy to produce fire check because stress is concentrated.Prior art can not be eliminated the crackle at this place fully, after only taking magnetic powder inspection and removing this place's defective, eliminates crackle fully by soldering.
Two through bolt hole centre distances of diesel engine intermediate are had relatively high expectations, and deviation is no more than ± 5mm.Because two through bolt holes of intermediate are longer, in casting process, open span from being difficult to control between two through bolt holes, the operated by rotary motion lacing wire is controlled on the technology.The problem that prior art exists is: (1), lacing wire are easy to generate flexural deformation, particularly after the normalizing heat treatment, because the flexural deformation of lacing wire causes two through bolt hole centre-to-centre spacing of intermediate to diminish.(2), slice off lacing wire after, there is crack defect lacing wire and two through bolt pipe junctions.Through magnetic powder inspection, when removing the crackle on the foundry goods, often the through bolt pipe is dug and wear, had a strong impact on the quality of foundry goods.Also have employing that rising head is set in lacing wire, the method for strengthening the feeding at this position is eliminated the crackle at this place, but effect and not obvious still has crackle to exist after the magnetic powder inspection.
Summary of the invention
The purpose of this invention is to provide a kind of two the through bolt hole scab and core sintering that can prevent intermediate, prevent the generation of fire check, prevent the casting method of the generation diesel engine cast steel intermediate of the distortion of intermediate and lacing wire and through bolt pipe junction crackle.
The object of the present invention is achieved like this: a kind of casting method of diesel engine cast steel intermediate may further comprise the steps:
Air-cooled arbor is made:
Through bolt hole core adopts thick-walled seamless steel pipes 8 to make air-cooled arbor, at the arc transition place that is provided with on the through bolt pipe 7 between 2, two rising heads 2 of rising head conformal external chill 3 is set;
Modelling:
Adopt plate moulding, make two on template, last nowel is located by alignment pin, makees the wooden model of conformal external chill 3 at arc transition place, through bolt pipe 7 both sides, prevents that the cross section that intermediate 1 produces distortion from being that criss-cross lacing wire 4 is fixed on the template;
Conformal external chill 3 is made:
With conformal external chill wood pattern molding, pour into a mould out steel conformal external chill 3, standby after use face is polished smooth;
Mulling:
Roughing sand is a quartz sand, adopts organic ester water-glass self-hardening sand moulding, coremaking;
Moulding:
Plate moulding, place conformal external chill 3 at arc transition place, nowel template through bolt pipe 7 both sides, external chill 5 is set, on top box through bolt pipe, rising head 2 is set in lacing wire 4 and through bolt pipe 7 junctions, do running channel with refractory brick tube, adopt bottom gating;
Coremaking:
Mould assembling:
Two parts about the sand mold are carried out mould assembling, after the mould assembling, tap into airduct 9 respectively at two through bolt hole steel pipe arbor one ends, other end air outlet 10 exposes outside the sand mold;
Cast:
Pour into a mould by casting technique requirement melting molten steel, logical compressed air cooling in two through bolt hole steel pipe arbors is gone in cast, behind the casting complete, stops logical compressed air after 4～6 hours.
Waterglass content is 3.0～3.5% of roughing sand weight, and the organic ester addition is 10～12% of a waterglass weight.Compressed-air actuated pressure is 0.25～0.45MPa.
The casting method of diesel engine cast steel intermediate provided by the present invention, make air-cooled arbor owing to adopt thick-walled seamless steel pipes, before the casting-up or during cast in steel pipe blowing compressed air air-cooled, can prevent two the through bolt hole scab and the core sintering of intermediate; The mode that adopts rising head to combine with the conformal external chill realizes the consecutive solidification of foundry goods, prevents the generation of fire check; After adopting the cross lacing wire, strengthen the flexing resistance of lacing wire, controlled the centre-to-centre spacing between two through bolt holes preferably, avoided the distortion of intermediate.In lacing wire and through bolt pipe junction external chill is set, prevents the generation of this place's crackle.
Description of drawings
Fig. 1 is the general intermediate process diagram of diesel engine.
Fig. 2 is that Figure 1B-B is to cutaway view.
Fig. 3 is that Figure 1A-A is to cutaway view.
Fig. 4 is a cross lacing wire structural representation of the present invention.
Fig. 5 is an intermediate through bolt of the present invention hole core box structural representation.
Fig. 6 is the side view of Fig. 5.
Fig. 7 intermediate through bolt hole core box C-C sectional structure schematic diagram.
Fig. 8 is an intermediate through bolt of the present invention hole air-cooled core tubular construction schematic diagram.
The specific embodiment
Technological measure of the present invention is as follows:
1, prevents the technological measure of intermediate 1 through bolt hole scab.Through bolt hole core adopts air-cooled arbor, because swiftly flowing compressed air is constantly taken away heat, core can not produce molten sintering owing to the effect of high-temperature molten steel, and molten steel solidifies very soon on the core surface of low temperature, can not produce scab.
2, prevent that intermediate 1 from producing the technological measure of fire check.Rising head 2 is set on the through bolt pipe, and the thermal center place of feeding bottom makes heat energy-saving position dense structure.Arc transition place between two rising heads 2 is provided with conformal external chill 3, strengthens Quench, and this position is solidified earlier, sets up intensity earlier than other positions, and it is concentrated to eliminate stress.
3, prevent that middle 1 body from producing the technological measure of distortion.Change the planform of lacing wire, with the cross sectional shape of lacing wire 4 by the square cross that changes into, to strengthen anti-bending strength.In lacing wire and through bolt pipe junction external chill 5 is set, impels this place's heat energy-saving position to solidify earlier, eliminate stress, thereby avoid the generation of crackle.
Embodiment:
With the general intermediate of S35MC diesel engine is example.
1, establishment casting technique
According to the general intermediate drawing establishment of S35MC diesel engine casting technique, process diagram as shown in Figure 1.
2, modelling
Wooden mold adopts plate moulding, makees two on template, and last nowel is located by alignment pin.Conformal external chill wooden model is made at the arc transition place in through bolt pipe both sides, chill thickness 30～40mm.Prevent that intermediate from producing the cross section that is out of shape is that criss-cross lacing wire 4 is fixed on the template.
3, mulling
Roughing sand is a quartz sand, adopts organic ester water-glass self-hardening sand moulding, coremaking.Waterglass content is 3.0～3.5% of roughing sand weight, and the organic ester addition is 10～12% of a waterglass weight.
4, the conformal external chill is made
With conformal external chill wood pattern molding, pour into a mould out steel conformal external chill 3, standby after use face is polished smooth.
5, moulding
Plate moulding is placed conformal external chill 3 by technology at arc transition place, nowel template through bolt pipe 7 both sides, conformal external chill 3 is placed between two rising heads 2.In lacing wire 4 and through bolt pipe junction 5 two of external chills are set.On top box through bolt pipe, rising head is set.Do running channel with refractory brick tube, adopt bottom gating.
6, coremaking
Arbor adopts thick-walled seamless steel pipes, and the wall thickness of steel pipe 8 generally adopts the above seamless steel pipe of 7.5mm, and the weldering of steel pipe two ends is about the pipe joint of 300mm.Be close to outer wall of steel pipe, put the netted hollow nylon hose of two Φ 6～8mm to symmetry, be used for exhaust along steel shaft.With the microlith cotton cord steel pipe is twined one deck, be used for hanging sand.The core sand organic ester water-glass self-hardening sand.Earlier put the thick special sand of one deck 5～8mm along inwall, then put common quartz sand in the above in core box the latter half.Put the steel pipe arbor in the core box centre, outermost layer is put special sand.The first half core extrudes with push pedal.
7, mould assembling
After the mould assembling, tap into airduct 9 respectively at two through bolt hole steel pipe arbor one ends, other end air outlet 10 exposes outside the sand mold.
8, melting
Require the melting molten steel according to material trademark.
9, cast
Pour into a mould by running gate system 6, before the cast or when cast logical compressed air in two through bolt hole steel pipe arbors cool off air pressure 0.25～0.45MPa.Behind the casting complete, after 4～6 hours, stop logical compressed air.
10, effect
Adopt this method to produce more than 70 in S35MC diesel engine intermediate altogether, all intermediate through bolt holes all do not produce scab, and sand removal is easy, and bore area is smooth.Every air-cooled core pipe reclaims repeatedly and uses 5～8 times.At the arc transition place conformal external chill is set, has eliminated the fire check at this place effectively, through magnetic powder inspection, surperficial flawless.After adopting the cross lacing wire, strengthen the flexing resistance of lacing wire greatly, controlled the centre-to-centre spacing between two through bolt holes preferably, avoided the distortion of intermediate.In lacing wire and through bolt pipe junction external chill is set, has eliminated the crackle at this place fully, improved casting quality.
Claims (3)
1. the casting method of a diesel engine cast steel intermediate is characterized in that:
Air-cooled arbor is made:
Through bolt hole core adopts thick-walled seamless steel pipes (8) to make air-cooled arbor, and rising head (2) is set on through bolt pipe (7), and the arc transition place between two rising heads (2) is provided with conformal external chill (3);
Modelling:
Adopt plate moulding, make two on template, last nowel is located by alignment pin, and the wooden model of conformal external chill (3) is made at the arc transition place in through bolt pipe (7) both sides, prevents that intermediate (1) from producing the cross section that is out of shape is that criss-cross lacing wire (4) is fixed on the template;
Conformal external chill (3) is made:
With conformal external chill wood pattern molding, pour into a mould out steel conformal external chill (3), standby after use face is polished smooth;
Mulling:
Roughing sand is a quartz sand, adopts organic ester water-glass self-hardening sand moulding, coremaking;
Moulding:
Plate moulding, place conformal external chill (3) at arc transition place, nowel template through bolt pipe (7) both sides, in lacing wire (4) and through bolt pipe (7) junction external chill (5) is set, rising head (2) is set on top box through bolt pipe, do running channel with refractory brick tube, adopt bottom gating;
Coremaking:
Core box (11) the latter half is made integral body, and the first half is semicircle push pedal (12), and core box (11) the latter half die joint has been done guide rail, and push pedal divides mould to do corresponding seam;
Mould assembling:
Two parts about the sand mold are carried out mould assembling, after the mould assembling, tap into airduct (9) respectively at two through bolt hole steel pipe arbor one ends, other end air outlet (10) exposes outside the sand mold;
Cast:
Pour into a mould by casting technique requirement melting molten steel, logical compressed air cooling in two through bolt hole steel pipe arbors is gone in cast, behind the casting complete, stops logical compressed air after 4～6 hours.
2. the casting method of diesel engine cast steel intermediate according to claim 1 is characterized in that: waterglass content is 3.0～3.5% of roughing sand weight, and the organic ester addition is 10～12% of a waterglass weight.
3. the casting method of diesel engine cast steel intermediate according to claim 1 is characterized in that: compressed-air actuated pressure is 0.25～0.45MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100197383A CN100369697C (en) | 2005-11-01 | 2005-11-01 | Method for casting cast steel intermediate product of diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100197383A CN100369697C (en) | 2005-11-01 | 2005-11-01 | Method for casting cast steel intermediate product of diesel engine |
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| CN1757458A CN1757458A (en) | 2006-04-12 |
| CN100369697C true CN100369697C (en) | 2008-02-20 |
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| CNB2005100197383A Active CN100369697C (en) | 2005-11-01 | 2005-11-01 | Method for casting cast steel intermediate product of diesel engine |
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| CN101199985B (en) * | 2006-12-14 | 2010-05-19 | 上海梅山钢铁股份有限公司 | Mould for ladle lining integral casting |
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| CN102430717B (en) * | 2011-12-31 | 2013-12-25 | 沪东重机有限公司 | Ventilation cooling sand core for casting cylinder jacket of diesel engine and manufacturing method thereof |
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| CN108927492A (en) * | 2018-08-16 | 2018-12-04 | 全椒县全动机械有限公司 | A kind of cast steel intermediate product of diesel engine manufacturing process |
| CN110180999B (en) * | 2019-06-25 | 2020-10-02 | 遵义航天新力精密铸锻有限公司 | Positioning tool and method for positioning pipe fitting in sand casting cooling plate by using same |
| CN111299536B (en) * | 2020-03-10 | 2022-06-28 | 陕西柴油机重工有限公司 | Method for solving shrinkage porosity of wheel shaft in casting of large nodular cast iron machine body |
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| CN1757458A (en) | 2006-04-12 |
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Owner name: YICHANG SHIPPING DIESEL ENGINE CO., LTD. Free format text: FORMER OWNER: YICHANG SHIPPING DIESEL ENGINE PLANT Effective date: 20090508 |
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Effective date of registration: 20090508 Address after: Hubei province Yichang City Qing Road No. 1 Patentee after: Yichang Marine Diesel Engine Co., Ltd. Address before: No. two, No. 93, Xiling Road, Yichang, Hubei Patentee before: Yichang Marine Diesel Engine Plant |