CN101444830A - Method for casting elevator gray cast-iron scored pulley - Google Patents

Method for casting elevator gray cast-iron scored pulley Download PDF

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CN101444830A
CN101444830A CNA2007101711833A CN200710171183A CN101444830A CN 101444830 A CN101444830 A CN 101444830A CN A2007101711833 A CNA2007101711833 A CN A2007101711833A CN 200710171183 A CN200710171183 A CN 200710171183A CN 101444830 A CN101444830 A CN 101444830A
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iron
melting
elevator
casting
gray cast
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CN101444830B (en
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徐清
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HUAXIN ALLOY CO Ltd SHANGHAI
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HUAXIN ALLOY CO Ltd SHANGHAI
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Abstract

The invention relates to a method for casting an elevator gray cast-iron scored pulley. The steps comprises mixed sand modeling, mould assembly, burden melting, tapping inoculation, pouring, cooling, unpacking and casting cleaning. The step of the burden melting comprises burden configuration and melting. The burden comprises the following compositions with the weight portion: 25-35 percent of pig iron, 45-55 percent of foundry return and 15-25 percent of scrap steel. A medium frequency induction furnace is adopted for the melting at the temperature of 1,430-1,530 DEG C. The tapping inoculation comprises two steps of the blast furnace tapping of iron liquor and silicon barium inoculation. An open riser with insulation function is adopted in the pouring, and a foam ceramic filter is arranged at the bottom of the open riser. The iron liquor is poured from the open riser. A pouring cup is not provided in the invention, and only one open riser with the insulation function is adopted for reducing the size of a sand case and the iron-sand ratio, therefore, the whole cost of the casting is lowered greatly; the technical casting yield is improved from 75 percent to 94.7 percent; and the economical benefit of industries is greatly improved.

Description

The casting method of elevator gray cast-iron scored pulley
Technical field
The present invention relates to casting field, particularly a kind of casting method of elevator gray cast-iron scored pulley.
Background technology
The elevating mechanism system of elevator mainly is that the function of motor is finished rolling or emitting of steel wire rope by reductor and driving wheel, thereby finishes the lifting or the decline task of elevator cab.In order to reduce the tensile load of steel wire rope, it must shuttle by several groups of mobile sheaves that are fixed on the fixed sheave on the roof and are fixed on the elevator cab, thereby the also corresponding reduction of the load of these sheaves.The material of general sheave is HT250, and its mechanical performance will satisfy tensile strength 〉=250Mpa, and body hardness HBS 〉=220, and working face wheel rim difference of hardness≤30HBS, each position of foundry goods do not allow any casting flaw and exist.Therefore how to satisfy above-mentioned specification requirement, become the key of casting elevator sheave.
Summary of the invention
Technical problem to be solved by this invention is that the casting technique of sheave class foundry goods is reformed and innovated, a kind of casting method of brand-new elevator gray cast-iron scored pulley is proposed, so that the elevator sheave of producing is when satisfying specification requirement, simplify casting technique, improve product yield, increase economic efficiency.
For achieving the above object, technical scheme of the present invention is:
A kind of casting method of elevator gray cast-iron scored pulley, its step comprise mulling moulding, mould assembly, furnace charge melting, tap a blast furnace breed, pour into a mould, cool off, unpack, foundry goods, cleaning, quality inspection; It is characterized in that: described furnace charge melting step comprises configuration furnace charge and melting, and the weight proportion of furnace charge is: 25~35% the pig iron, 45~55% foundry return, 15~25% steel scrap; Institute's furnace burdening adopts medium-frequency induction furnace to carry out the melting of iron liquid, and smelting temperature is 1430~1530 ℃; Described tapping a blast furnace bred operation and comprised that iron liquid comes out of the stove and two steps of silicon barium inoculation, and wherein, described cast operation adopts the open riser that heat insulation function is arranged, and in the bottom of open riser floamed ceramics filtrating piece is set, and iron liquid pours into from open riser.
Further, the adding total amount that described silicon barium breeds the used silicon titanate innoculant of step is 0.3~0.7% of the melting amount of tapping a blast furnace, and the chemical composition mass percent of silicon titanate innoculant is: Si 60~70%, Ca 0.8~2.2%, Ba 4.0~6.0%, and Al 1.0~2.0%, the Fe surplus.
The granularity of silicon titanate innoculant is 5~10mm.
In addition, the final chemical composition mass percent of iron liquid is after the inoculation of the present invention: C 2.8~3.2%, and Si 1.9~2.3%, and Mn 0.8~1.1%, P≤0.10%, and S 0.6~0.9%, and Cu 0.8~1.2%, and Sn 0.02~0.05%, the Fe surplus.
Described mould assembly operation is included in the preceding bottom of floamed ceramics filtrating piece being put into open riser of mould assembly; Its iron liquid casting temperature is 1330~1430 ℃ in the described cast operation.
Elevator gray cast-iron scored pulley requires separately cast test bar tensile strength 〉=250Mpa, body hardness 〉=220HB, and the cylindrical integral hardness poor≤30HB.Because this product is the elevator accessory, requires each position of foundry goods not allow casting flaws such as any knockout, pore, cold shut, shrinkage porosite and slag inclusion, and after the cylindrical processing belt grooves, casting flaws such as slag inclusion, shrinkage porosite, pore must not be arranged.
The difference of technology of the present invention and conventional cast technology maximum is do not have cup, sprue, cross gate, the special-purpose rising head of ingate, but adopt an open riser that heat insulation function is arranged, and it is taken as cup again, directly pours into a mould from the middle wheel hub of foundry goods.
During common process design running gate system, the die joint that iron liquid is surveyed outside the wheel rim of sheave through cup sprue, cross gate and ingate enters die cavity, and for product does not produce shrinkage porosite, adds one to two feeding head between wheel rim and ingate.Though this technology also can obtain not have the foundry goods of shrinkage defect, but the temperature field that the greatest problem that exists is an iron liquid to be full of behind the die cavity is very inhomogeneous, the temperature height that is connected the rim section that with rising head, rim section temperature away from the rising head junction is low, the part cooling velocity that temperature is high is slow, thereby hardness is on the low side; The part cooling velocity that temperature is low is fast, causes hardness higher.Like this, the requirement of product rim section uniformity of hardness just can not reach.This technology rim section hardness value difference reaches more than the 40HB.The inhomogeneous of cooling velocity also caused uneven internal stress to cast product.
Eliminate the problem that above-mentioned conventional casting brings, will try every possible means to allow the iron liquid that pours into die cavity be full of the rim section of product simultaneously exactly as far as possible, pour into iron liquid from wheel hub and just can reach this purpose.The present invention that Here it is selects from the reason of the open riser cast iron liquid of foundry goods wheel hub top.The open riser here is taken as again and waters rim of a cup usefulness.It is made with insulation material, is in the condition of high temperature so that guarantee rising head, reaches to emit the eloquence final set after the foundry goods various piece is solidified, and does not produce shrinkage defect to guarantee each position of foundry goods.
In order to guarantee casting quality, in the insulation cup, put the foam ceramic filter net, the screen pack effect has 2 points: when 1, the impurity in the iron liquid is by screen pack, stick effect by machinery, impurity is kept off outside foundry goods; Flow velocity can slow down to some extent when 2, iron liquid was by screen pack, and had a rectified action, made iron liquid to enter die cavity stably, avoided producing phenomenons such as sand washing, volume gas.
Beneficial effect of the present invention:
1) operation is more simple;
2) owing to there is not traditional running gate system, can reduce the sandbox size, reduce the iron sand ratio, reduce cost;
3) remove traditional cup, sprue, cross gate and ingate, and only adopted an open riser that heat insulation function is arranged, made the whole cost of foundry goods reduce greatly;
4) only adopt an open riser that heat insulation function is arranged, iron liquid is placed with the floamed ceramics filtrating piece from this bottom and pours into, and has so just reduced the sandbox size, has reduced the placer iron ratio, simultaneously product yield brings up to 94.7% by original 75%, thereby has improved the business economic benefit greatly;
5) casting yield height, former technology always occur the shrinkage porosite problem in processing after the belt grooves, do not find the shrinkage porosite problem after adopting this technology;
6) the whole uniformity of foundry goods cylindrical is very good, and integral hardness is poor≤20HB;
7) the elevator gray cast-iron scored pulley tensile strength 〉=250Mpa that produces, product body hardness HBS 〉=220, and working face wheel rim difference of hardness≤30HBS.
Description of drawings
Fig. 1 is the schematic diagram of elevator gray cast-iron scored pulley of the present invention;
Fig. 2 is elevator gray cast-iron scored pulley casting schematic diagram of the present invention.
The specific embodiment
Embodiment 1
Elevator gray cast-iron scored pulley casting method of the present invention comprises the steps:
(1) mulling moulding, mould assembly
Wheel hub shaping case 1 adopts furan resin self curing sand mulling moulding, molding then, repair type, coat, place floamed ceramics filtrating piece 3, mo(u)ld top half 11, mo(u)ld bottom half 12 mould assemblys then in open riser 2 bottoms of mo(u)ld top half 11, with to be cast behind the tight case of bolt etc., referring to Fig. 1, Fig. 2;
(2) furnace charge melting
Dispose furnace charge earlier, the weight proportion of furnace charge is: contain 30% the pig iron, 50% foundry return, 20% steel scrap; Then the furnace charge that configures is dropped into medium-frequency induction furnace and carry out the melting of iron liquid, when temperature reaches 1450 ℃ after iron liquid has melted, carry out iron liquid sampling spectral analysis, afterwards the chemical composition debugging mode of original iron melt to prescribed limit, and iron liquid is warmed up to 1520 ℃ of maximum temperatures, and leave standstill insulation 5~10 minutes, allow impurity in the iron liquid is fully floating to come up, claw with poly-slag agent gathering, do not allow these impurity bands in the iron liquid of handling.
(3) tap a blast furnace and breed
Specific practice is that the iron liquid temp that superheating and standing is crossed is dropped to 1430 ℃, taps a blast furnace then, carries out inoculation along with iron liquid stream adds silicon titanate innoculant in the liquid that taps a blast furnace; The granularity of the silicon titanate innoculant that adds is 5~10mm, and the total amount of the silicon titanate innoculant of adding is 0.6% of the melting amount of tapping a blast furnace, and the chemical composition mass percent of silicon titanate innoculant is: Si 65%, Ca 2.0%, Ba 5%, Al 1.5% and Fe surplus; The final chemical composition of iron liquid is after the inoculation: the Fe of Ca 3.0%, Si 2.1%, Mn 0.9%, P 0.065%, S 0.075%, Cu 1.0%, Sn 0.035% and surplus.
(4) cast
Adopt to put down and water the teeming pouring technology, iron liquid directly pours into from open riser, in the open riser bottom floamed ceramics filtrating piece is set and carries out pushing off the slag; Wherein pouring temperature is controlled at 1380 ℃.
(5) cooling, unpacking
(6) casting cleaning
(7) quality inspection
Quality inspection is underproofly eliminated when waste product, the qualified casting finished products storehouse that enters.
The main technologic parameters of table 1 several embodiments of the present invention
Figure A200710171183D00061
Figure A200710171183D00071
The technical process of embodiment 2,3,4,5 repeats no more with embodiment 1.

Claims (7)

1. the casting method of elevator gray cast-iron scored pulley, its step comprise mulling moulding, mould assembly, furnace charge melting, tap a blast furnace breed, pour into a mould, cool off, unpack, casting cleaning; It is characterized in that: described furnace charge melting step comprises configuration furnace charge and melting, and the weight proportion of furnace charge is: 25~35% the pig iron, 45~55% foundry return, 15~25% steel scrap; Institute's furnace burdening adopts medium-frequency induction furnace to carry out the melting of iron liquid, and smelting temperature is 1430~1530 ℃; Described tapping a blast furnace bred operation and comprised that iron liquid comes out of the stove and two steps of silicon barium inoculation, and wherein, described cast operation adopts the open riser that heat insulation function is arranged, and in the bottom of open riser floamed ceramics filtrating piece is set, and iron liquid pours into from open riser.
2. the casting method of elevator gray cast-iron scored pulley as claimed in claim 1 is characterized in that, described mould assembly operation is included in the preceding bottom of floamed ceramics filtrating piece being put into open riser of mould assembly.
3. the casting method of elevator gray cast-iron scored pulley as claimed in claim 1 is characterized in that, the iron liquid casting temperature is 1330~1430 ℃ in the described cast operation.
4. the casting method of elevator gray cast-iron scored pulley as claimed in claim 1, it is characterized in that, the adding total amount that described silicon barium breeds the used silicon titanate innoculant of step is 0.3~0.7% of the melting amount of tapping a blast furnace, the chemical composition mass percent of silicon titanate innoculant is: Si 60~70%, Ca 0.8~2.2%, Ba 4.0~6.0%, and Al 1.0~2.0%, the Fe surplus.
5. the casting method of elevator gray cast-iron scored pulley as claimed in claim 4 is characterized in that, the granularity of silicon titanate innoculant is 5~10mm.
6. the casting method of elevator gray cast-iron scored pulley as claimed in claim 1, it is characterized in that, the final chemical composition mass percent of iron liquid is after the inoculation: C 2.8~3.2%, Si 1.9~2.3%, and Mn 0.8~1.1%, P≤0.10%, S 0.6~0.9%, Cu 0.8~1.2%, Sn0.02~0.05%, Fe surplus.
7. the casting method of elevator gray cast-iron scored pulley as claimed in claim 1 is characterized in that, leaves standstill insulation 5~10 minutes after the melting of iron liquid, allows impurity in the iron liquid is fully floating to come up, and clawing with poly-slag agent gathering, does not allow these impurity bands in the iron liquid of processing.
CN2007101711833A 2007-11-28 2007-11-28 Method for casting elevator gray cast-iron scored pulley Expired - Fee Related CN101444830B (en)

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Cited By (15)

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CN102451904A (en) * 2010-11-01 2012-05-16 上海华新合金有限公司 Casting method of body casting of centrifugal air compressor
CN102527943A (en) * 2012-03-30 2012-07-04 辉县市汽车配件有限责任公司 Overhead choke-flow filter buffer type casting pouring technological method
CN101987348B (en) * 2009-08-06 2012-12-19 上海华新合金有限公司 Method for casting road roller bracket casting
CN103464693A (en) * 2013-09-18 2013-12-25 苏州市通润机械铸造有限公司 Casting technology capable of reducing hardness difference of traction wheel rope groove face
CN103600032A (en) * 2013-03-05 2014-02-26 南通华东油压科技有限公司 Dedicated riser for manufacturing technology of walking machinery bracket casting
CN103668333A (en) * 2012-08-31 2014-03-26 沈阳铝镁设计研究院有限公司 Low-phosphorous low-sulfur gray pig iron formula for aluminum anode assembly and production method thereof
CN103846391A (en) * 2014-03-10 2014-06-11 长沙金龙铸造实业有限公司 Production method of traction sheave of elevator
CN103862000A (en) * 2014-04-04 2014-06-18 江苏力源金河铸造有限公司 Vertical parting horizontal pouring casting technology for end cover casting core shell
CN103920857A (en) * 2014-05-06 2014-07-16 南通华东油压科技有限公司 Casting method of three-way valve body of agricultural combined machine
CN106825412A (en) * 2017-02-14 2017-06-13 王伟红 A kind of new precision casting mould
CN107052251A (en) * 2016-12-31 2017-08-18 邓锦志 Filter residue casting rising head
CN107626892A (en) * 2017-09-21 2018-01-26 宁波市平熔金属制品有限公司 A kind of power plant's dragveyer rich chromium cast iron idle pulley runner less apparatus for pouring
CN108645685A (en) * 2018-04-23 2018-10-12 武汉泛洲中越合金有限公司 A kind of preparation facilities and its method of spectrum control sample
CN110396639A (en) * 2019-07-10 2019-11-01 广西大学 A kind of preparation method of gray cast iron
CN114713774A (en) * 2022-04-11 2022-07-08 邢台轧辊沃川装备制造有限公司 Production method of high-strength heat-resistant gray cast iron furnace door frame

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CN101987348B (en) * 2009-08-06 2012-12-19 上海华新合金有限公司 Method for casting road roller bracket casting
CN102451904A (en) * 2010-11-01 2012-05-16 上海华新合金有限公司 Casting method of body casting of centrifugal air compressor
CN102451904B (en) * 2010-11-01 2013-09-25 上海华新合金有限公司 Casting method of body casting of centrifugal air compressor
CN102527943A (en) * 2012-03-30 2012-07-04 辉县市汽车配件有限责任公司 Overhead choke-flow filter buffer type casting pouring technological method
CN103668333B (en) * 2012-08-31 2016-04-13 沈阳铝镁设计研究院有限公司 Aluminium anode assembling low-phosphorous low-sulfur gray pig iron formula and production method
CN103668333A (en) * 2012-08-31 2014-03-26 沈阳铝镁设计研究院有限公司 Low-phosphorous low-sulfur gray pig iron formula for aluminum anode assembly and production method thereof
CN103600032A (en) * 2013-03-05 2014-02-26 南通华东油压科技有限公司 Dedicated riser for manufacturing technology of walking machinery bracket casting
CN103464693B (en) * 2013-09-18 2015-11-04 苏州市通润机械铸造有限公司 A kind of casting technique reducing traction sheave grooving surface hardness difference
CN103464693A (en) * 2013-09-18 2013-12-25 苏州市通润机械铸造有限公司 Casting technology capable of reducing hardness difference of traction wheel rope groove face
CN103846391A (en) * 2014-03-10 2014-06-11 长沙金龙铸造实业有限公司 Production method of traction sheave of elevator
CN103846391B (en) * 2014-03-10 2016-01-20 长沙金龙铸造实业有限公司 A kind of production method of elevator traction sheave
CN103862000B (en) * 2014-04-04 2016-04-27 江苏力源金河铸造有限公司 A kind of end cap foundry goods core shell vertical-parting casting on flat casting technique
CN103862000A (en) * 2014-04-04 2014-06-18 江苏力源金河铸造有限公司 Vertical parting horizontal pouring casting technology for end cover casting core shell
CN103920857B (en) * 2014-05-06 2015-11-18 南通华东油压科技有限公司 A kind of casting method of agricultural combine three-way valve body
CN103920857A (en) * 2014-05-06 2014-07-16 南通华东油压科技有限公司 Casting method of three-way valve body of agricultural combined machine
CN107052251A (en) * 2016-12-31 2017-08-18 邓锦志 Filter residue casting rising head
CN106825412A (en) * 2017-02-14 2017-06-13 王伟红 A kind of new precision casting mould
CN107626892A (en) * 2017-09-21 2018-01-26 宁波市平熔金属制品有限公司 A kind of power plant's dragveyer rich chromium cast iron idle pulley runner less apparatus for pouring
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CN108645685A (en) * 2018-04-23 2018-10-12 武汉泛洲中越合金有限公司 A kind of preparation facilities and its method of spectrum control sample
CN110396639A (en) * 2019-07-10 2019-11-01 广西大学 A kind of preparation method of gray cast iron
CN114713774A (en) * 2022-04-11 2022-07-08 邢台轧辊沃川装备制造有限公司 Production method of high-strength heat-resistant gray cast iron furnace door frame
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