CN101695742B - Method for producing engine gear case - Google Patents
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- CN101695742B CN101695742B CN 200910152738 CN200910152738A CN101695742B CN 101695742 B CN101695742 B CN 101695742B CN 200910152738 CN200910152738 CN 200910152738 CN 200910152738 A CN200910152738 A CN 200910152738A CN 101695742 B CN101695742 B CN 101695742B
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Abstract
The invention provides a method for producing an engine gear case. The method comprises the following steps of: adding raw materials containing iron into an intermediate frequency electric furnace, melting the raw materials containing iron into molten iron by heating, performing a reaction of the molten iron, the modulizer and alloy materials to obtain molten alloy, forming a metal-back shell mold by cast iron, and pouring the molten alloy into the metal-back shell mold; and after a long-time research by an inventor, the working temperature of products, the pouring temperature and the pouring speed of the alloy and the stay time of a casting in the casting mold are strictly controlled, and the metal-back shell mold is a breakthrough adoption for casting, so that the technical problems existing in the field that the dimensional precision is poor and the yield rate due to artificial production of the mold by using green sand for a long time are solved.
Description
Technical field
The present invention relates to a kind of production method, relate in particular to a kind of production method of engine gear case.
Background technology
Old-fashioned casting method is adopted in the production of traditional engine gear case, uses furnace cupola as the raw material melter, and casting mould relies on hand moulding, and the furnace cupola combustion fuel not only consumes ample resources, inefficiency, and can produce a large amount of environmental pollutions; The hand moulding of casting mould causes product surface coarse, and precision is not high, particularly the product inner surface; Overall craft produces that speed is slow, and yield rate is low, causes product cost higher.
Summary of the invention
It is high to the purpose of this invention is to provide a kind of yield rate, and product surface is meticulous, the engine gear case production method that production efficiency is high.
Above-mentioned technical purpose of the present invention is achieved by the following technical programs:
A kind of production method of engine gear case, it comprises following production stage successively:
(1) after joining the raw material of iron content in the middle frequency furnace, the raw material of described iron content is heated, make the raw material of described iron content be fused into molten iron;
(2) nodulizer and alloy raw material are put into ladle;
(3) will pour in the described ladle of step (2) through the molten iron that step (1) obtains, described molten iron and described nodulizer and alloy raw material are reacted, obtain alloy molten solution;
(4) after the described reaction of step (3) is finished, rubbish and the residue that will float on the described alloy molten solution of step (3) surface are removed, and obtain clean alloy molten solution;
(5) cylinder iron make the swage mould, in the swage die hole, spread resin sand, with swage described resin sand is fixed, can make the multiple sand mo(u)ld tool semi-finished product of swage; Then the multiple sand mo(u)ld tool semi-finished product of described swage are put into heating furnace and heat, make the described swage of the rear taking-up of resin sand typing, make the multiple sand mo(u)ld tool of swage;
(6) use sand core machine that resin sand is made the resin sand loam core, and packed in the multiple sand mo(u)ld tool of the swage that step (5) makes in described resin sand loam core;
(7) will inject through the clean alloy molten solution that step (4) make the multiple sand mo(u)ld tool of described swage, form engine gear case foundry goods semi-finished product behind the clean alloy molten solution cooling forming of described injection, then remove the resin sand that is bonded in described foundry goods surface of semi-finished, make the engine gear case foundry goods.
Production engine gear chamber foundry goods of the present invention is the shell of engine gear group; The described middle frequency furnace of step (1) uses the raw material of electric energy heating iron content and makes the raw material fusing of iron content; The pouring practice before casting of the described foundry ladle of step (2) holds molten iron, has driving to carry, and is made by fire clay.
The shape of engine gear case of the present invention is comparatively complicated, makes engine gear case dimension precision requirement of the present invention higher, and the inventor has adopted the multiple sand mo(u)ld tool cast engine gear chamber of swage breakthroughly; The multiple sand mo(u)ld tool casting of described swage claims again diecasting, and it is that liquid metals is poured into the cast iron casting type, to obtain a kind of casting method of foundry goods; Compare with traditional tide mould sand molding, it is high that the multiple sand of swage has the product mechanical performance, precision and surface smoothness are good, quality and dimensionally stable, the technique recovery rate is high, raw materials consumption is few, save the advantages such as Modeling Material, the while also exists airtight, and without deformability, easily cause product to wash deficiency, the defective of cracking, through long-felt, to the operating temperature of product, the time that the pouring temperature of alloy and poring rate, foundry goods stop in casting mold is strictly controlled, solved this area and used for a long time tide mould sand to make the poor dimensional precision of mould by hand, the technical problem that yield rate is low.
As preferably: the raw material of iron content comprise the pig iron, steel scrap, foundry returns, ferrosilicon and ferromanganese.
As preferably: the raw material heat fused temperature of iron content described in the step (1) is 1450～1500 degrees centigrade, be lower than described temperature, then the raw material of iron content can't melt, be higher than described temperature, then waste fuel, increase cost, simultaneously, based on the multiple fast characteristics of sand mo(u)ld tool heat conduction of swage, too high or too low temperature all can cause the product that can't cast or cast out to produce damage, bubble and cause waste product.
As preferably: the described alloy raw material of step (2) comprises copper and magnesium, copper is as the alloying component of alloy raw material adjustable product, with physical characteristics such as the intensity of improving product, durabilitys, magnesium is the alloying component of adjustable product both, with physical characteristics such as the intensity of improving product, durabilitys, again as the catalyst of spheroidizing reacion.
As preferably: the reaction time of the described nodulizer of step (3) and alloy raw material and described molten iron is 70～100 seconds, so that spheroidizing reacion fully carries out, can't too shortly induce reaction not enough or oversize inducing reaction excessively of described time because of the described time.
As preferably: the temperature that the multiple sand mo(u)ld tool semi-finished product heating of swage described in the step (5) needs is 200～300 degrees centigrade, heating was held time 70～100 seconds, temperature is crossed low or is held time too short, the capital makes resin sand fixing insufficient, and insufficient strength causes the final product dimensional accuracy not high, the surface is not meticulous, and excess Temperature or hold time longly can cause that then resin sand damages, and the multiple sand mo(u)ld tool of last swage can't be made.
As preferably: the thickness of spreading resin sand described in the step (5) is 4～8 millimeters, the deflation resistance in the time of suitably reducing the product cooling.
In sum, the present invention has following beneficial effect:
1, the resin sand loam core adopts sand core machine to make, any surface finish, so product surface is meticulous, roughness is good;
2, the multiple sand handicraft product dimensional accuracy of swage is high, surface fine, so the percent defective of product is low, and yield rate is high, saves the production cost, and the quantity of doing over again simultaneously reduces, and production efficiency improves;
3, adopt middle frequency furnace production,, compare with furnace cupola in the former technique, have the melting efficiency height, quick heating, easy control of temperature, energy savings, metal ingredient is even, and the advantage that labour intensity is little further reduces cost, reduces simultaneously to produce and pollutes.
Description of drawings
Fig. 1 is the multiple sand mo(u)ld tool loam cake front view of swage of the present invention;
Fig. 2 is the multiple sand mo(u)ld tool lower cover front view of swage of the present invention.
The specific embodiment
Embodiment one:
A kind of production method of engine gear case, it comprises following production stage successively:
(1) after joining the raw material of iron content in the middle frequency furnace, the raw material of described iron content are heated, make the raw material of described iron content be fused into molten iron, the raw material of iron content comprise the pig iron, steel scrap, foundry returns, ferrosilicon and ferromanganese, the pig iron is the iron-carbon alloy of phosphorus content between 2%～4.3%, the various steel of steel scrap for reclaiming, and foundry returns is substandard products, the waste product of producing, ferrosilicon and ferromanganese are respectively the ferroalloys that contains silicon and manganese, in order to regulate the content of silicon and manganese in the product;
(2) nodulizer and alloy raw material are put into ladle, nodulizer ReMg 3-8, alloy raw material are copper and magnesium, and magnesium also has spheroidizing simultaneously;
(3) will pour in the described ladle of step (2) through the molten iron that step (1) obtains, described molten iron and described nodulizer and alloy raw material are reacted, through 70～100 seconds reaction time, just can obtain alloy molten solution;
(4) after the described reaction of step (3) is finished, rubbish and the residue that will float on the described alloy molten solution of step (3) surface are removed, and obtain clean alloy molten solution;
(5) be processed into the swage unidimensional with finished product with iron block, cylinder iron make swage mould loam cake and lower cover such as Fig. 1, Fig. 2, in swage mould loam cake and lower cover hole, spread the resin sand of 4～8 millimeters thick, with swage described resin sand is fixed, can make the multiple sand mo(u)ld tool semi-finished product of swage; Then the multiple sand mo(u)ld tool semi-finished product of described swage are put into heating furnace and be heated to 200 degrees centigrade degrees centigrade, kept 70 seconds, and made the resin sand typing, then take out described swage, make the multiple sand mo(u)ld tool loam cake semi-finished product of swage and lower cover semi-finished product, piece together the multiple sand mo(u)ld tool of complete swage;
(6) use sand core machine that resin sand is made the resin sand loam core, and packed in the multiple sand mo(u)ld tool of the swage that step (5) makes in described resin sand loam core;
(7) will inject through the clean alloy molten solution that step (4) make the multiple sand mo(u)ld tool of described swage, form engine gear case foundry goods semi-finished product behind the clean alloy molten solution cooling forming of described injection, then remove the resin sand that is bonded in described foundry goods surface of semi-finished, make the engine gear case foundry goods.
Embodiment two:
A kind of production method of engine gear case, it comprises following production stage successively:
(1) after joining the raw material of iron content in the middle frequency furnace, the raw material of described iron content are heated, make the raw material of described iron content be fused into molten iron, the raw material of iron content comprise the pig iron, steel scrap, foundry returns, ferrosilicon and ferromanganese, the pig iron is the iron-carbon alloy of phosphorus content between 2%～4.3%, the various steel of steel scrap for reclaiming, and foundry returns is substandard products, the waste product of producing, ferrosilicon and ferromanganese are respectively the ferroalloys that contains silicon and manganese, in order to regulate the content of silicon and manganese in the product;
(2) nodulizer and alloy raw material are put into ladle, nodulizer ReMg 3-8, alloy raw material are copper and magnesium, and magnesium also has spheroidizing simultaneously;
(3) will pour in the described ladle of step (2) through the molten iron that step (1) obtains, described molten iron and described nodulizer and alloy raw material are reacted, through 70～100 seconds reaction time, just can obtain alloy molten solution;
(4) after the described reaction of step (3) is finished, rubbish and the residue that will float on the described alloy molten solution of step (3) surface are removed, and obtain clean alloy molten solution;
(5) be processed into the swage unidimensional with finished product with iron block, cylinder iron make swage mould loam cake and lower cover such as Fig. 1, Fig. 2, in swage mould loam cake and lower cover hole, spread the resin sand of 4～8 millimeters thick, with swage described resin sand is fixed, can make the multiple sand mo(u)ld tool semi-finished product of swage; Then the multiple sand mo(u)ld tool semi-finished product of described swage are put into heating furnace and be heated to 300 degrees centigrade degrees centigrade, kept 70 seconds, and made the resin sand typing, then take out described swage, make the multiple sand mo(u)ld tool loam cake semi-finished product of swage and lower cover semi-finished product, piece together the multiple sand mo(u)ld tool of complete swage;
(6) use sand core machine that resin sand is made the resin sand loam core, and packed in the multiple sand mo(u)ld tool of the swage that step (5) makes in described resin sand loam core;
(7) will inject through the clean alloy molten solution that step (4) make the multiple sand mo(u)ld tool of described swage, form engine gear case foundry goods semi-finished product behind the clean alloy molten solution cooling forming of described injection, then remove the resin sand that is bonded in described foundry goods surface of semi-finished, make the engine gear case foundry goods.
Embodiment three:
A kind of production method of engine gear case, it comprises following production stage successively:
(1) after joining the raw material of iron content in the middle frequency furnace, the raw material of described iron content are heated, make the raw material of described iron content be fused into molten iron, the raw material of iron content comprise the pig iron, steel scrap, foundry returns, ferrosilicon and ferromanganese, the pig iron is the iron-carbon alloy of phosphorus content between 2%～4.3%, the various steel of steel scrap for reclaiming, and foundry returns is substandard products, the waste product of producing, ferrosilicon and ferromanganese are respectively the ferroalloys that contains silicon and manganese, in order to regulate the content of silicon and manganese in the product;
(2) nodulizer and alloy raw material are put into ladle, nodulizer ReMg3-8, alloy raw material are copper and magnesium, and magnesium also has spheroidizing simultaneously;
(3) will pour in the described ladle of step (2) through the molten iron that step (1) obtains, described molten iron and described nodulizer and alloy raw material are reacted, through 70～100 seconds reaction time, just can obtain alloy molten solution;
(4) after the described reaction of step (3) is finished, rubbish and the residue that will float on the described alloy molten solution of step (3) surface are removed, and obtain clean alloy molten solution;
(5) be processed into the swage unidimensional with finished product with iron block, cylinder iron make swage mould loam cake and lower cover such as Fig. 1, Fig. 2, in swage mould loam cake and lower cover hole, spread the resin sand of 4～8 millimeters thick, with swage described resin sand is fixed, can make the multiple sand mo(u)ld tool semi-finished product of swage; Then the multiple sand mo(u)ld tool semi-finished product of described swage are put into heating furnace and be heated to 200 degrees centigrade degrees centigrade, kept 100 seconds, and made the resin sand typing, then take out described swage, make the multiple sand mo(u)ld tool loam cake semi-finished product of swage and lower cover semi-finished product, piece together the multiple sand mo(u)ld tool of complete swage;
(6) use sand core machine that resin sand is made the resin sand loam core, and packed in the multiple sand mo(u)ld tool of the swage that step (5) makes in described resin sand loam core;
(7) will inject through the clean alloy molten solution that step (4) make the multiple sand mo(u)ld tool of described swage, form engine gear case foundry goods semi-finished product behind the clean alloy molten solution cooling forming of described injection, then remove the resin sand that is bonded in described foundry goods surface of semi-finished, make the engine gear case foundry goods.
Embodiment four:
A kind of production method of engine gear case, it comprises following production stage successively:
(1) after joining the raw material of iron content in the middle frequency furnace, the raw material of described iron content are heated, make the raw material of described iron content be fused into molten iron, the raw material of iron content comprise the pig iron, steel scrap, foundry returns, ferrosilicon and ferromanganese, the pig iron is the iron-carbon alloy of phosphorus content between 2%～4.3%, the various steel of steel scrap for reclaiming, and foundry returns is substandard products, the waste product of producing, ferrosilicon and ferromanganese are respectively the ferroalloys that contains silicon and manganese, in order to regulate the content of silicon and manganese in the product;
(2) nodulizer and alloy raw material are put into ladle, nodulizer ReMg 3-8, alloy raw material are copper and magnesium, and magnesium also has spheroidizing simultaneously;
(3) will pour in the described ladle of step (2) through the molten iron that step (1) obtains, described molten iron and described nodulizer and alloy raw material are reacted, through 70～100 seconds reaction time, just can obtain alloy molten solution;
(4) after the described reaction of step (3) is finished, rubbish and the residue that will float on the described alloy molten solution of step (3) surface are removed, and obtain clean alloy molten solution;
Be processed into the swage unidimensional with finished product with iron block, cylinder iron make swage mould loam cake and lower cover such as Fig. 1, Fig. 2, in swage mould loam cake and lower cover hole, spread the resin sand of 4～8 millimeters thick, with swage described resin sand is fixed, can make the multiple sand mo(u)ld tool semi-finished product of swage; Then the multiple sand mo(u)ld tool semi-finished product of described swage are put into heating furnace and be heated to 300 degrees centigrade degrees centigrade, kept 100 seconds, and made the resin sand typing, then take out described swage, make the multiple sand mo(u)ld tool loam cake semi-finished product of swage and lower cover semi-finished product, piece together the multiple sand mo(u)ld tool of complete swage;
(6) use sand core machine that resin sand is made the resin sand loam core, and packed in the multiple sand mo(u)ld tool of the swage that step (5) makes in described resin sand loam core;
(7) will inject through the clean alloy molten solution that step (4) make the multiple sand mo(u)ld tool of described swage, form engine gear case foundry goods semi-finished product behind the clean alloy molten solution cooling forming of described injection, then remove the resin sand that is bonded in described foundry goods surface of semi-finished, make the engine gear case foundry goods.
This technique is compared with traditional tide mould sand mould, and product tensile strength on average can improve 25%, and yield strength on average improves 20%, and its etch resistant properties and hardness also significantly improve, and material consumption quantity reduces, and can save 15～30%, can save Modeling Material 80% simultaneously; Mould adopts iron to make, can Reusability repeatedly, save in a large number cost; The cooling velocity that multiple layer of sand has been regulated product effectively makes product not go out spoken parts in traditional operas on the one hand, makes again on the other hand cooling rate greater than sand casting.Swage is without collapsibility, but very thin multiple sand can suitably reduce the deflation resistance of product.Swage has good rigidity in addition, effectively limits the Graphite Particles in Spheroidal Graphite Cast Iron expansion, has realized head-free casting, eliminates to loosen, and has improved the density of foundry goods.
Claims (7)
1. the production method of an engine gear case, it is characterized in that: it comprises following production stage successively:
(1) after joining the raw material of iron content in the middle frequency furnace, the raw material of described iron content is heated, make the raw material of described iron content be fused into molten iron;
(2) nodulizer and alloy raw material are put into ladle;
(3) will pour in the described ladle of step (2) through the molten iron that step (1) obtains, described molten iron and described nodulizer and alloy raw material are reacted, obtain alloy molten solution;
(4) after the described reaction of step (3) is finished, rubbish and the residue that will float on the described alloy molten solution of step (3) surface are removed, and obtain clean alloy molten solution;
(5) cylinder iron make the swage mould, in the swage die hole, spread resin sand, with swage described resin sand is fixed, can make the multiple sand mo(u)ld tool semi-finished product of swage; Then the multiple sand mo(u)ld tool semi-finished product of described swage are put into heating furnace and heat, make the described swage of the rear taking-up of resin sand typing, make the multiple sand mo(u)ld tool of swage;
(6) use sand core machine that resin sand is made the resin sand loam core, and packed in the multiple sand mo(u)ld tool of the swage that step (5) makes in described resin sand loam core;
(7) will inject through the clean alloy molten solution that step (4) make the multiple sand mo(u)ld tool of described swage, form engine gear case foundry goods semi-finished product behind the clean alloy molten solution cooling forming of described injection, then remove the resin sand that is bonded in described foundry goods surface of semi-finished, make the engine gear case foundry goods.
2. the production method of described engine gear case according to claim 1, it is characterized in that: the raw material of iron content comprise the pig iron, steel scrap, foundry returns, ferrosilicon and ferromanganese.
3. the production method of described engine gear case according to claim 1, it is characterized in that: the required temperature of the raw material heat fused of iron content described in the step (1) is 1450～1500 degrees centigrade.
4. the production method of described engine gear case according to claim 1, it is characterized in that: the described alloy raw material of step (2) comprises copper and magnesium.
5. the production method of described engine gear case according to claim 1, it is characterized in that: the reaction time of the described nodulizer of step (3) and alloy raw material and described molten iron is 70～100 seconds.
6. the production method of described engine gear case according to claim 1, it is characterized in that: the temperature of the multiple sand mo(u)ld tool semi-finished product heating of swage described in the step (5) needs is 200～300 degrees centigrade, heats and holds time 70～100 seconds.
7. the production method of described engine gear case according to claim 1, it is characterized in that: the thickness of spreading resin sand described in the step (5) is 4～8 millimeters.
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| CN 200910152738 CN101695742B (en) | 2009-09-27 | 2009-09-27 | Method for producing engine gear case |
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| CN101380665A (en) * | 2007-09-03 | 2009-03-11 | 中国国际海运集装箱(集团)股份有限公司 | Wheel hub casting method and die thereof |
| CN101418414A (en) * | 2008-12-11 | 2009-04-29 | 南车戚墅堰机车有限公司 | QT600-3 iron casting and manufacture method thereof |
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2009
- 2009-09-27 CN CN 200910152738 patent/CN101695742B/en active Active
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| JP2832564B2 (en) * | 1992-02-20 | 1998-12-09 | 株式会社 関 | How to make precious metal jewelry |
| CN1861313A (en) * | 2006-03-15 | 2006-11-15 | 中国第一汽车集团公司无锡柴油机厂 | Art for mfg. Austempered Ductile iron gear for diesel engine |
| CN101323014A (en) * | 2007-06-13 | 2008-12-17 | 张北海 | Method for processing alloy chilled nodular cast iron cylinder rod |
| CN101380665A (en) * | 2007-09-03 | 2009-03-11 | 中国国际海运集装箱(集团)股份有限公司 | Wheel hub casting method and die thereof |
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Denomination of invention: Method for producing engine gear case Effective date of registration: 20131023 Granted publication date: 20130320 Pledgee: Nanxun Rural Commercial Bank of Zhejiang, Limited by Share Ltd Pledgor: Huzhou Dingsheng Machinery Manufacturing Co., Ltd. Registration number: 2013990000773 |
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Address after: 313013, Zhejiang City, Huzhou province Nanxun district training Town, Zhu Village, Li port city City Industrial Park Patentee after: Huzhou Dingsheng Machinery Co.,Ltd. Address before: 313013, Zhejiang City, Huzhou province Nanxun district training Town, Zhu Village, Li port city City Industrial Park Patentee before: HUZHOU DINGSHENG MACHINERY CO.,LTD. |
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