CN102744373B - The casting technique of piston shell - Google Patents
The casting technique of piston shell Download PDFInfo
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- CN102744373B CN102744373B CN201210230867.7A CN201210230867A CN102744373B CN 102744373 B CN102744373 B CN 102744373B CN 201210230867 A CN201210230867 A CN 201210230867A CN 102744373 B CN102744373 B CN 102744373B
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Abstract
The invention discloses a kind of casting technique of piston shell, first the upper of piston shell is made, lower inner core, and form whole core, put into piston shell model inner, the success rate of the casting of product can be improved, add raw material when melting to have: the pig iron, steel scrap, foundry returns, ferromanganese, molybdenum-iron, copper, vanadium iron, ferrochrome, ferro-nickel element, the percentage by weight added is: the pig iron 34%, steel scrap 26%, foundry returns 33%, ferromanganese 1.4%, molybdenum-iron 0.8%, copper 0.5%, vanadium iron 0.6%, ferrochrome 1.5%, ferronickel 0.8%, stokehold adds Si-Ca-Ba inovulant Multi inoculation, after cast, separately cast test bar as cast condition tensile strength is to more than 380MPa, hardness is at 255-270HB, graphite class 5 level, pearlite reaches 97%, meet the requirements of the customers completely, processing characteristics is good, without the need to heat treatment, reduce production cost, also effectively add the service life of piston shell.
Description
Technical field
The present invention relates to casting technique, be specifically related to a kind of casting technique of piston shell.
Background technology
Existing piston shell used on train exists that weight is large, product density is large, and casting technique also exists following shortcoming:
1) must through stress relief annealing process after casting pouring in casting technique, production cycle is long, cost is high, and casting pig (HT350) mechanical performance after heat treatment is very unstable, be difficult to the technical requirement meeting HT350, heat treatment again adjustment is often needed to meet the requirements, both waste resource and time, also add the casting cost of piston shell;
2) because piston shell inner core chamber adopts integral casting forming, in existing casting technique, scrappage is high.
Summary of the invention
The object of the invention is to overcome existing piston shell used on train in prior art and have that weight is large, the large and casting technique waste resource of product density and time, cost is high, scrappage is high problem, The present invention reduces the difficulty of casting technique, improve yield rate, adopt As-cast condition production method without the need to heat treatment, reduce production cost, also effectively add the service life of piston shell.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:
A casting technique for piston shell, is characterized in that: comprise the following steps,
Step (1) makes the upper and lower inner core of piston shell;
The upper and lower inner core of casting is combined into whole core by step (2);
Step (3) uses the external model of resin sand casting piston shell;
Whole core described in step (2) is put into external model after taking out step (3) described external model by step (4), composition piston shell model;
Step (5) smelts piston shell
Add raw material when melting to have: the pig iron, steel scrap, foundry returns, ferromanganese, molybdenum-iron, copper, vanadium iron, ferrochrome, ferro-nickel element, the percentage by weight added is: the pig iron 34%, steel scrap 26%, foundry returns 33%, ferromanganese 1.4%, molybdenum-iron 0.8%, copper 0.5%, vanadium iron 0.6%, ferrochrome 1.5%, ferronickel 0.8%, after stove stokehold adds Si-Ca-Ba inovulant Multi inoculation, then the composition piston shell model described in step (4) is poured into, after cast, separately cast test bar as cast condition tensile strength is to more than 380MPa, without the need to heat treatment, namely complete the smelting of piston shell.
The casting technique of aforesaid piston shell, is characterized in that: described step (1) makes the upper and lower inner core of piston shell, specifically comprises the following steps:
(1) peritonaeum sand is filled full hot box;
(2) electrothermal core box, makes hot box temperature between 500 DEG C-700 DEG C;
(3) shaping upper and lower inner core is taken out.
The casting technique of aforesaid piston shell, is characterized in that: the upper and lower inner core of casting is combined into whole core by described step (2), and concrete steps are as follows:
(1) upper and lower fuse is combined into complete combination fuse by gluing the connecing of casting;
(2) wicking surface brushing graphite paint will be combined, dry;
(3) moulding, mould assembling, cast.
The casting technique of aforesaid piston shell, is characterized in that: described step (3) smelts piston shell, specifically comprises the following steps:
(1) melting operation: the 80% blow-on melting adding the pig iron, steel scrap total amount respectively, electric induction furnace is frequently opened with small-power, after 4-6 minute, frequency electric induction furnace power is risen to 90%, the power output of adjustment frequency electric induction furnace is 100% of rated power until completely melted, add the remaining all pig iron and steel scrap again, add foundry returns simultaneously, whole ferrochrome, ferromanganese, molybdenum-iron, vanadium iron is added successively after being warming up to 1380-1410 DEG C after fusing completely, be warming up to 1430 DEG C, and be incubated 5-10 minute, add fine copper 0.5% again after stirring;
(2) breed operation: add total amount half ferrosilicon and put into casting ladle, half ferrosilicon is added in plug for outlet, along with iron liquid slowly flows into casting ladle, after being disposed, utilizing chill block method to after iron liquid Multi inoculation, carry out cast-in-site.
The casting technique of aforesaid piston shell, is characterized in that: described chill block method breeds iron liquid and specifically comprises the following steps:
1) when bonded hard ferrite magnet to 1450 DEG C, chill block is done in sampling;
2) add inovulant adjustment, until control the chill width 5-7mm of chill block, can cast-in-site be carried out.
The invention has the beneficial effects as follows: first make the upper of piston shell, lower inner core, and form whole core, put into piston shell model inner, improve the success rate of the casting of product, add raw material when melting to have: the pig iron, steel scrap, foundry returns, ferromanganese, molybdenum-iron, copper, vanadium iron, ferrochrome, ferro-nickel element, the percentage by weight added is: the pig iron 34%, steel scrap 26%, foundry returns 33%, ferromanganese 1.4%, molybdenum-iron 0.8%, copper 0.5%, vanadium iron 0.6%, ferrochrome 1.5%, ferronickel 0.8%, stokehold adds Si-Ca-Ba inovulant and breeds for twice, after cast, separately cast test bar as cast condition tensile strength is to more than 380MPa, hardness is at 255-270HB, graphite class 5 level, pearlite reaches 97%, meet the requirements of the customers completely, processing characteristics is good, without the need to heat treatment, reduce production cost, also effectively add the service life of piston shell.
Accompanying drawing explanation
Fig. 1 is the flow chart of the casting technique of piston shell of the present invention.
Detailed description of the invention
The casting technique of piston shell of the present invention as shown in Figure 1, comprises the following steps:
The first step, makes the upper and lower inner core of piston shell;
Second step, is combined into whole core by the upper and lower inner core of casting;
3rd step, uses the external model of resin sand casting piston shell;
4th step, after taking out the external model described in the 3rd step, puts into external model by the whole core described in second step, composition piston shell model;
5th step, smelts piston shell
Wherein the first step makes the upper and lower inner core of piston shell, specifically comprises the following steps:
1) peritonaeum sand is filled full hot box,
2) electrothermal core box, makes hot box temperature between 500 DEG C-700 DEG C;
3) shaping upper and lower inner core is taken out.
Wherein the upper and lower inner core of casting is combined into whole core by second step, specifically comprises the following steps:
(1) upper and lower fuse is combined into complete combination fuse by gluing the connecing of casting;
(2) wicking surface brushing graphite paint will be combined, dry;
(3) moulding, mould assembling, cast.
5th step, smelts piston shell,
Add raw material when melting to have: the pig iron, steel scrap, foundry returns, ferromanganese, molybdenum-iron, copper, vanadium iron, ferrochrome, ferro-nickel element,
The percentage by weight added is: pig iron 33-35%, steel scrap 25-27%, foundry returns 31-35%, ferromanganese 1.3-1.5%, molybdenum-iron 0.7-0.9%, copper 0.4-0.6%, vanadium iron 0.4-0.6%, ferrochrome 1.5%, ferrosilicon 1.5%.
Here the pig iron 34% is preferably, steel scrap 26%, foundry returns 33%, ferromanganese 1.4%, molybdenum-iron 0.8%, copper 0.5%, vanadium iron 0.6%, ferrochrome 1.5%, ferronickel 0.8%, wherein added ferromanganese is manganeisen is 65 manganese, and added molybdenum-iron is the ferroalloy of molybdenum and iron composition, it is containing molybdenum 63%, and added vanadium iron is the ferroalloy of vanadium and iron composition, and it is containing vanadium 45%, added ferrosilicon is Antaciron, it is 75 silicon, and added ferrochrome is the ferroalloy of chromium and iron composition, and it is containing chromium 50%, after having prepared burden, enter melting and breed operation:
(1) melting operation: add the pig iron (Z18 that pig iron model selects intensity high) respectively, 80% blow-on melting of steel scrap total amount, electric induction furnace is frequently opened with small-power, after 4-6 minute, preferably 5 minutes, frequency electric induction furnace power is risen to 90%, the power output of adjustment frequency electric induction furnace is 100% of rated power until completely melted, add the remaining all pig iron and steel scrap again, add foundry returns simultaneously, whole ferrochrome is added successively after being warming up to 1380-1410 DEG C after fusing completely, ferromanganese, molybdenum-iron, vanadium iron, be warming up to 1430 DEG C, and be incubated 5-10 minute, fine copper 0.5% is added again after upper genus alloy melts completely and stirs with molten iron under electromagnetic action,
(2) operation is bred: add total amount half ferrosilicon and put into casting ladle, half ferrosilicon is added in plug for outlet, along with iron liquid slowly flows into casting ladle, after being disposed, utilize chill block method to after iron liquid Multi inoculation, carry out cast-in-site, wherein chill block method breeds iron liquid and specifically comprises the following steps:
1) when bonded hard ferrite magnet to 1450 DEG C, chill block is done in sampling;
2) add inovulant adjustment, until control the chill width 5-7mm of chill block, generally breed for twice and can meet the demands, then carry out cast-in-site.
By above-mentioned burden process, melting operation, the locomotive piston shell separately cast test bar as cast condition tensile strength of production reaches more than 380MPa, and hardness is at 255-270HB, graphite class 5 level, pearlite reaches 97%, meets the requirements of the customers completely, processing characteristics is good, without the need to heat treatment.
In sum, The present invention reduces the difficulty of casting technique, improve yield rate, adopt As-cast condition production method without the need to heat treatment, reduce production cost, also effectively add the service life of piston shell.
More than show and describe general principle of the present invention, principal character and advantage.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and description just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (4)
1. the casting technique of piston shell, is characterized in that: comprise the following steps,
Step (1) makes the upper and lower inner core of piston shell;
The upper and lower inner core of casting is combined into whole core by step (2);
Step (3) uses the external model of resin sand casting piston shell;
Whole core described in step (2) is put into external model after taking out step (3) described external model by step (4), composition piston shell model;
Step (5) smelts piston shell
Add raw material when melting to have: the pig iron, steel scrap, foundry returns, ferromanganese, molybdenum-iron, copper, vanadium iron, ferrochrome, ferrosilicon, the percentage by weight added is: pig iron 33-35%, steel scrap 25-27%, foundry returns 31-35%, ferromanganese 1.3-1.5%, molybdenum-iron 0.7-0.9%, fine copper 0.5%, vanadium iron 0.4-0.6%, ferrochrome 1.5%, ferrosilicon 1.5%, after stokehold adds silicon iron inoculator Multi inoculation, then the composition piston shell model described in step (4) is poured into, after cast, separately cast test bar as cast condition tensile strength is to more than 380MPa, without the need to heat treatment, namely complete the smelting of piston shell;
Described step (5) smelts piston shell, specifically comprises the following steps:
(1) melting operation: the 80% blow-on melting adding the pig iron, steel scrap total amount respectively, high-frequency induction furnace is opened with small-power, after 4-6 minute, high-frequency induction furnace power is risen to 90%, the power output adjusting high-frequency induction furnace is until completely melted 100% of rated power, add the remaining all pig iron and steel scrap again, add foundry returns simultaneously, whole ferrochrome, ferromanganese, molybdenum-iron, vanadium iron is added successively after being warming up to 1380-1410 DEG C after fusing completely, be warming up to 1430 DEG C, and be incubated 5-10 minute, add fine copper 0.5% again after stirring;
(2) breed operation: add total amount half ferrosilicon and put into casting ladle, half ferrosilicon is added in plug for outlet, along with iron liquid slowly flows into casting ladle, after being disposed, utilizing chill block method to the test of iron liquid, after Multi inoculation, carry out cast-in-site.
2. the casting technique of piston shell according to claim 1, is characterized in that: described step (1) makes the upper and lower inner core of piston shell, specifically comprises the following steps:
(1) peritonaeum sand is filled full hot box;
(2) electrothermal core box, makes hot box temperature between 500 DEG C-700 DEG C;
(3) shaping upper and lower inner core is taken out.
3. the casting technique of piston shell according to claim 1, is characterized in that: the upper and lower inner core of casting is combined into whole core by described step (2), and concrete steps are as follows:
(1) upper and lower fuse is combined into complete combination fuse by gluing the connecing of casting;
(2) wicking surface brushing graphite paint will be combined, dry.
4. the casting technique of piston shell according to claim 1, is characterized in that: described chill block method specifically comprises the following steps the test of iron liquid:
1) when bonded hard ferrite magnet to 1450 DEG C, chill block is done in sampling;
2) add inovulant adjustment, until control the chill width 5-7mm of chill block, can cast-in-site be carried out.
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| CN201210230867.7A CN102744373B (en) | 2012-07-05 | 2012-07-05 | The casting technique of piston shell |
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| CN201210230867.7A CN102744373B (en) | 2012-07-05 | 2012-07-05 | The casting technique of piston shell |
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| CN102744373B true CN102744373B (en) | 2016-03-02 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103273011B (en) * | 2013-05-14 | 2016-08-17 | 繁昌县金科机电科技有限公司 | A kind of production technology of thin-walled piston body |
| CN103316914A (en) * | 2013-05-18 | 2013-09-25 | 张连成 | Method for manufacturing metal part blanks |
| CN104690222A (en) * | 2013-12-05 | 2015-06-10 | 山东省源通机械股份有限公司 | High-strength wear-resistant roller production technology |
| CN105855464A (en) * | 2016-03-03 | 2016-08-17 | 柳州永旺科技有限公司 | Roller production technology of loosener |
| CN105855476A (en) * | 2016-03-03 | 2016-08-17 | 柳州永旺科技有限公司 | Roller production technology used in agricultural machinery |
| CN105803301A (en) * | 2016-03-25 | 2016-07-27 | 福建省神悦铸造股份有限公司 | Shell mold casting process |
| CN106238688B (en) * | 2016-07-29 | 2018-07-03 | 常熟市派菲特铸造有限公司 | A kind of casting method of piston type casting |
| CN107587031A (en) * | 2017-09-27 | 2018-01-16 | 安徽海立精密铸造有限公司 | A kind of casting technique of piston shell |
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| JPS58209443A (en) * | 1982-05-31 | 1983-12-06 | Izumi Jidosha Kogyo Kk | Cast iron piston and its production |
| CN1876878A (en) * | 2005-06-10 | 2006-12-13 | 上海上大热欣科技发展有限公司 | CrMoCu alloy cast iron continuous casting section bar and manufacturing method thereof |
| CN101585078A (en) * | 2008-05-23 | 2009-11-25 | 上海华新合金有限公司 | Method for casting as-cast high-tenacity cast iron bearing cover of locomotive |
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Address after: 241206 Anhui city of Wuhu province Fanchang County Sun Village plow Mountain Industrial Park Patentee after: FANCHANG COUNTY JINKE ELECTROMECHANICAL TECHNOLOGY CO.,LTD. Address before: 241206 Anhui city of Wuhu province Fanchang County Sun Village plow Mountain Industrial Park Patentee before: FANCHANG JINKE ELECTRICAL AND MECHNICAL TECHNOLOGY CO.,LTD. Address after: 241206 Anhui city of Wuhu province Fanchang County Sun Village plow Mountain Industrial Park Patentee after: FANCHANG JINKE ELECTRICAL AND MECHNICAL TECHNOLOGY CO.,LTD. Address before: 241206 Anhui city of Wuhu province Fanchang County Sun Village plow Mountain Industrial Park Patentee before: FANCHANG COUNTY JINKE CASTING Co.,Ltd. |
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Denomination of invention: Casting process for piston shell Effective date of registration: 20170322 Granted publication date: 20160302 Pledgee: Fanchang County of Anhui Province gold complex financing Company limited by guarantee Pledgor: FANCHANG COUNTY JINKE ELECTROMECHANICAL TECHNOLOGY CO.,LTD. Registration number: 2017990000225 |