CN104722713B - A kind of dead head structure of sheet-type steel-casting - Google Patents
A kind of dead head structure of sheet-type steel-casting Download PDFInfo
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- CN104722713B CN104722713B CN201510143050.XA CN201510143050A CN104722713B CN 104722713 B CN104722713 B CN 104722713B CN 201510143050 A CN201510143050 A CN 201510143050A CN 104722713 B CN104722713 B CN 104722713B
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- casting
- foundry goods
- rising head
- sheet
- thermal center
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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
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/088—Feeder heads
Abstract
The dead head structure of a kind of sheet-type steel-casting in the present invention relates to casting technology field, including the semi-cylindrical rising head being sticked above the lateral thermal center of foundry goods, described foundry goods is sheet-type cap steel-casting, foundry goods is vertically arranged in casting mold, and the Kong Weizhu of foundry goods is real, described rising head bottom transition is provided with riser neck, described riser neck lateral conformal at the thermal center of foundry goods surrounds thermal center, the periphery of described rising head is provided with heat-insulation layer, described casting section thickness is d, and described rising head exceeds the height h ＞ 2d on the upside of foundry goods.The casting pressing port structure of the present invention can solve the casting shrinkage porosite problem of this type of foundry goods, and improves production efficiency, reduces casting operation difficulty.
Description
Technical field
The present invention relates to casting technology field, particularly to the dead head structure of a kind of sheet-type steel-casting.
Background technology
Gear box casing-cap in marine oil installations is as it is shown in figure 1, be the important component part of variable-speed motor, and operating mode is disliked
Bad, this type of sheet-type cap Internal Quality of Cast requires the highest, and testing requirement is radiographic inspection, and defect accepts rank≤II
Level.Above-mentioned cap steel-casting main body is a thin plate, is provided with several hole in the middle part of thin plate, and the periphery in hole has boss, therefore hole week
Thickness thicker than the thickness of cap body sheet, easily form casting thermal center herein during casting, cause casting shrinkage porosite.Existing skill
In art, this type of foundry goods uses multiple-core casting technique as shown in Figure 2, uses two foundry goods to share the technique of an open riser 3, middle
By transition subsidy 2, feeding a casting, three circular holes in foundry goods are all cast reality.This technique is from sides such as quality, cost and efficiency
There are some shortcomings in face.First, quality aspect, after the casting of three circular holes is real, the thermal center of foundry goods in the junction in three holes, open riser 3
By transition subsidy, thermal center being carried out feeding, thermal center carries out feeding to other positions again.And after cast top first solidifies volume
Diminish, the molten steel in rising head under atmospheric pressure effect to the heat energy-saving position of foundry goods, further along the direction feeding of antigravity to pushing up
Portion, will realize the process of this consecutive solidification, and primary need rising head is sufficiently high, using the teaching of the invention it is possible to provide abundant molten steel, secondary need
Rising head top investing time is later than the time of thermal center solidification.This just requires that the volume of Feeder Design is sufficiently large, the heat that itself stores
Amount is many, requires that rising head can not dispel the heat too fast simultaneously, and the bedding thickness being not only related to heat preserving agent is the most suitable, uniform, further relates to
The operation factors such as the bedding time is the most timely, it is difficult to accurately control.Often there is shrinkage porosite in actual production medium casting heat energy-saving position
Phenomenon.Secondly, becoming present aspect, the shrinkage porosite that thermal center district often occurs causes welding to reprocess cost and RT detection retake cost significantly increases
Adding, production cost is high.
Finally, efficiency aspect, two foundry goods are unified into one, can improve efficiency in theory, but in actual production, close at lower core
To ensure that two foundry goods align by manual operations during case.This operation is the most highly difficult, and once deformation occurs in core
More cannot coordinate the size of two foundry goods, cause production efficiency low.
Summary of the invention
The present invention is directed in prior art problem present in sheet-type cap System for Steel Casting Process, it is provided that a kind of thin plate
The dead head structure of type steel-casting, to solve the casting shrinkage porosite of this type of foundry goods, and improves production efficiency, reduces casting operation difficult
Degree.
The object of the present invention is achieved like this, the dead head structure of a kind of sheet-type steel-casting, including being sticked in foundry goods side
Semi-cylindrical rising head above thermal center, described foundry goods is sheet-type cap steel-casting, and foundry goods is vertically arranged in casting mold, and
The Kong Weizhu of foundry goods is real, and described rising head bottom transition is provided with riser neck, and described riser neck is lateral conformal bag at the thermal center of foundry goods
Enclosing thermal center, the periphery of described rising head is provided with heat-insulation layer, and described casting section thickness is d, and described rising head exceeds the height h ＞ on the upside of foundry goods
2d。
The dead head structure of the sheet-type steel-casting of the present invention, all casts reality the hole of foundry goods, makes thermal center concentrate on foundry goods
It is centrally formed a bigger thermal center, is laterally sticked semi-cylindrical rising head at the foundry goods that thermal center is corresponding, not only makes rising head from upper
And lower to feeding a casting, and also thermal center can be carried out effective, lasting feeding, to ensure the quality of foundry goods；The half of the present invention
It is lateral that cylindrical rising head is close to foundry goods, makes the foundry goods of the first half itself also function as the effect of part rising head, not only can mend in time
Contracting can also reduce Riser Dimensions, thus saves the consumption of pour steel.
For ease of optimizing Riser Dimensions, the radius R of described rising head meets following relation: R >=2d, R >=3.5M1,, the height H=3R, M of rising head1For thermal center modulus.Wherein, thermal center modulus M1,Computing formula is M1=V/S, wherein V table
Showing thermal center volume, S represents the area of thermal center radiating surface.In the present invention, dead head structure and size first have to meet the modulus with thermal center
Relation and the feeding liquid measure to foundry goods, and the constriction in rising head is all in semicolumn, makes foundry goods itself fine and close intact
Fall into.The Riser Dimensions of the present invention is determined by following process: according to casting technique requirement, the modulus M of foundry goods open riser2It is greater than
Thermal center modulus M11.2 times, it may be assumed that
M2≥1.2M1Formula 1
The semi-cylindrical rising head M of the present invention0Modulus calculation formula:
M0=V/S=π RH/ [2 (π R+ π H+2H)] formula 2
H is the height of semi-cylindrical rising head；
Place warming plate outside rising head, be 1.35 through measuring the heat insulating coefficient of warming plate, be equivalent to the modulus of rising head to expand
Big 1.35 times, the therefore modulus of rising head:
M2=1.35M0Formula 3
Formula 2 is substituted into formula 3 obtain:
M2=1.35 π RH/ [2 (π R+ π H+2H)] formula 4
Because having two variable R and H in formula 4, the depth-width ratio of conventional rising head is generally 1.3 ~ 1.5, i.e. 1.3≤H/(2R)
≤ 1.5, such combination has countless versions, but the semicircle column type rising head of the present invention needs to exceed foundry goods upper surface, the most just requires H-number
Bigger, for ease of ensureing the amount of feeding liquid, select marginal value H/(2R)=1.5, it may be assumed that
H=3R formula 5
Formula 5 and bring in formula 4:
M2=0.343R formula 6
Formula 6 is substituted in formula 1, obtains R and M1Relation:
R≥3.5M1Formula 7
The minima of R and H, i.e. rising head can be obtained by formula 5 and formula 7 and meet the minimum chi with thermal center modulo relationship
Very little, in formula, the unit of R and H is cm, on this basis, in addition it is also necessary to the check to riser feeding liquid measure, calculation formulas:
M=[(14-ε)/ε] * v* formula 8
Wherein m rising head available feeding liquid measure, unit is kg；ε body shrinkage factor, relevant with material, this material
Matter is 5.65；V rising head volume, this semicircle column type rising head V=π R2H/2；Molten steel density, under pouring temperature be
7.2kg/dm3.Parameter and formula 5 are substituted into formula 8:
m=0.05R3Formula 9
Feeding liquid measure m of conventional casting pressing port is greater than weight m of foundry goods (including subsidy)1, emitting of this semicolumn type
Mouth is a part for foundry goods as rising head, and therefore the casting weight below rising head is m1, m1Substitute into formula 9:
Formula 10
Show according to software analog result, it is ensured that rising head is contracted in semicolumn, and ensure that foundry goods itself is fine and close intact
Falling into that this is relevant with the ratio of casting section thickness d with the radius R of rising head, to exceed the height h of foundry goods relevant with casting section thickness for rising head simultaneously,
Through repeatedly simulation test and foundry method improvement, on the basis of meeting modulo relationship and feeding liquid measure,
R >=2d formula 11
H >=2d formula 12
To sum up, determine that Riser Dimensions needs to meet R >=3.5M1、, R >=2d, therefrom select maximum R value,
Highly H=3R, then verifies h >=2d, if can not meet, then improves H, changes R simultaneously, it is thus achieved that final Riser Dimensions.
For ease of ensureing the rising head effective feeding to thermal center, laterally it is connected in 45 ° of transition with die cavity bottom riser neck, this
Bright rising head and riser neck structure, riser neck upper end is semicircle column type rounding off with the lower end of rising head, and riser neck bottom is from heat
The side at joint position surrounds thermal center with 45 ° of inclined-planes, both can ensure that rising head effective feeding thermal center, it is also possible to avoid rising head and thermal center
Contact forms bigger thermal center and reduces feeding effect.
For ease of the concentration of foundry goods thermal center, the foundry goods contrary with rising head is laterally provided with for making foundry goods thermal center concentrate on die cavity
The subsidy at center.
Accompanying drawing explanation
Fig. 1 is the structure of sheet-type cap steel-casting.
Fig. 2 is the casting technique schematic diagram of sheet-type cap steel-casting of the prior art.
Fig. 3 is the dead head structure schematic diagram one of the sheet-type steel-casting of the present invention.
Fig. 4 is the dead head structure schematic diagram two of the sheet-type steel-casting of the present invention.
Fig. 5 is the dead head structure schematic diagram three of the sheet-type steel-casting of the present invention.
Wherein, 1 foundry goods；1A thermal center；2 transition subsidies；3 open risers；4 subsidies；5 rising heads；6 heat-insulation layers；7 riser necks.
Detailed description of the invention
As shown in Fig. 3, Fig. 4 and Fig. 5, for the dead head structure of the sheet-type steel-casting of the present invention, the foundry goods 1 of the present invention is middle
Having three borehole structures, circular has the boss of protrusion, and in casting, three circular holes use real casting structure, and in foundry goods 1 side
To by subsidy 4, the boss of three circular holes is coupled together, make foundry goods form a bigger thermal center three circular hole junctions
1A, in casting, uses cored-up mould technique, and foundry goods 1 is vertically arranged in sandbox, and the wall thickness d of foundry goods is 73mm, soft by three-dimensional
The thermal center of part analogue measurement foundry goods and thermal center are with weight m1 of lower part, and record the modulus M1=4cm, m of foundry goods thermal center1=
400kg；
M1 is substituted into formula 7, R >=140mm；
M1Substitute into formula 10, R >=200mm；
D is substituted in formula 11, R >=146mm；
To sum up, take R=200mm, substitute in formula 5, H=600mm, this semicircle column type rising head 5 is arranged on the lateral of foundry goods 1
Middle top, through measuring h=230mm, meets formula 12.Arranging heat-insulation layer 6 outside rising head, heat-insulation layer laterally leaves with foundry goods
30mm spacing is so that follow-up removal.Being provided below and the riser neck 7 of foundry goods 1 conformal at rising head 5, bottom surface surrounds with 45 ° of inclined-planes
Lateral at thermal center 1A.
The dead head structure of the sheet-type steel-casting of the present invention, through optimization above-mentioned to dead head structure, it is possible to achieve rising head is certainly
Upper and the lower feeding to foundry goods, feeding efficiency is high, and thermal center can carry out effective, lasting feeding, thus ensures casting quality,
And semi-cylindrical rising head volume is little, cast in one piece, and coremaking, mould assembling etc. are simple to operate, improve production efficiency.
Claims (4)
1. a dead head structure for sheet-type steel-casting, including the semi-cylindrical rising head being sticked above the lateral thermal center of foundry goods, institute
Stating foundry goods is sheet-type cap steel-casting, and foundry goods is vertically arranged in casting mold, and the Kong Weizhu of foundry goods is real, bottom described rising head
Transition is provided with riser neck, and described riser neck lateral conformal at the thermal center of foundry goods surrounds thermal center, and the periphery of described rising head is provided with guarantor
Temperature layer, described casting section thickness is d, and described rising head exceeds the height h ＞ 2d on the upside of foundry goods.
The dead head structure of sheet-type steel-casting the most according to claim 1, it is characterised in that the radius R of described rising head is full
The following relation of foot: R >=2d, R >=3.5M1,, the height H=3R, M of rising head1For thermal center modulus.
The dead head structure of sheet-type steel-casting the most according to claim 1, it is characterised in that bottom described riser neck and type
Chamber laterally connects in 45 ° of transition.
The dead head structure of sheet-type steel-casting the most according to claim 2, it is characterised in that the foundry goods side contrary with rising head
To being provided with for making foundry goods thermal center concentrate on the subsidy at foundry goods center.
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| CN104722713B true CN104722713B (en) | 2017-01-04 |
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| CN105127372B (en) * | 2015-08-31 | 2017-08-15 | 共享铸钢有限公司 | A kind of Feeder Design method of big wall thickness semi-circular inner casing casting |
| CN105215271B (en) * | 2015-10-29 | 2017-09-22 | 共享铸钢有限公司 | The cored-up mould sand mould structure and cored-up mould method of a kind of gear box casing casting |
| CN110990980A (en) * | 2019-12-30 | 2020-04-10 | 西峡县西泵特种铸造有限公司 | Design method of spherical riser of heat-resistant steel volute |
| CN113255077B (en) * | 2021-05-27 | 2021-09-21 | 宁波全力机械模具有限公司 | Riser design method of automobile motor end cover and casting mold thereof |
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| JP3603687B2 (en) * | 1999-09-07 | 2004-12-22 | 日産自動車株式会社 | Die casting mold |
| CN1748901A (en) * | 2005-10-17 | 2006-03-22 | 蒋斌沅 | Method for casting hollow mould |
| CN202219317U (en) * | 2011-09-27 | 2012-05-16 | 郑州远东耐火材料有限公司 | Cast steel dead head |
| CN103128231B (en) * | 2013-03-12 | 2015-10-07 | 洛阳古城机械有限公司 | A kind of method solving head valve boss shrinkage cavity shrinkage porosity |
| CN103212667B (en) * | 2013-03-26 | 2016-05-18 | 山东蒙凌工程机械股份有限公司 | Production technology and the V method mould of application V method cast gear box casing |
| CN103394644B (en) * | 2013-07-30 | 2015-03-11 | 河北师范大学 | Casting method capable of preventing precise investment casting from generating hot-spot shrinkage holes |
| CN203635867U (en) * | 2013-11-06 | 2014-06-11 | 宁波亿泰来模具有限公司 | Pouring gate structure of aluminium alloy high thin-wall box body |
| CN103658541B (en) * | 2013-12-19 | 2016-04-06 | 中国船舶重工集团公司第十二研究所 | The method to set up of marine diesel fuselage casting pressing port |
| CN203972773U (en) * | 2014-07-09 | 2014-12-03 | 上海圣德曼铸造有限公司 | The feeding structure of green-sand casting knuckle |
| CN204770477U (en) * | 2015-03-30 | 2015-11-18 | 共享铸钢有限公司 | Rising head structure of sheet metal type steel -casting |
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