CN104962804A - Casting method of bearing caps - Google Patents
Casting method of bearing caps Download PDFInfo
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- CN104962804A CN104962804A CN201510267308.7A CN201510267308A CN104962804A CN 104962804 A CN104962804 A CN 104962804A CN 201510267308 A CN201510267308 A CN 201510267308A CN 104962804 A CN104962804 A CN 104962804A
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Abstract
The invention discloses a casting method of bearing caps. The casting method comprises following steps: templet preparation; sand mould preparation; anti-loosening core print preparation; melting; pouring; and obtaining of finished products. The anti-loosening core print is prepared after sand mould preparation; the anti-loosening core print comprises a truncated-cone-shaped bottom pillar; the bottom of the bottom pillar is provided with a strip pillar; the anti-loosening core print is inserted into a cylindrical groove, the strip pillar is inserted into the sand mould, and the bottom pillar is arranged in the groove. The casting method is capable of solving a problem that loosening of casting parts is easily caused, and increasing product qualified rate, tensile strength, elongation percentage, and yield strength, and possesses excellent beneficial effects.
Description
Technical field
The present invention relates to a kind of casting technique, feature relates to a kind of casting technique of step cover.
Background technology
In heavy mechanical equipment, step cover is one of the most common part.Common step cover comprises step cover main body, and step cover body interior has die cavity, and the bottom of step cover main body has edge, base, and the medial surface on edge, base is provided with one group of cylindrical fixed leg.The casting technique of step cover, is be poured in sand mold by molten iron, obtains foundry goods after cooling.Due to the characteristic of iron casting, cooled and solidified is externally to solidified inside, exterior cooling fast, slowly inner colded, after cooled and solidified process, easily makes the wall thickness part of foundry goods become loose, produces discard.In addition, melting technology and the pouring technology of the casting of existing step cover are more unreasonable, cause foundry goods comparatively can not be satisfactory in the performances such as tensile strength, unit elongation and yield strength.
Summary of the invention
Technical problem to be solved by this invention is the casting technique providing step cover.The invention solves foundry goods and easily produce loose problem, improve conforming product rate, and invention also improves tensile strength, unit elongation and yield strength, there is very superior beneficial effect.
For solving the problems of the technologies described above, technical scheme of the present invention is as follows: the casting technique of step cover, specifically comprises the following steps:
A, making template; Template comprises base plate, and base plate is provided with punch main body, and the surface of punch main body is provided with one group of cylindrical lug;
B, making sand mold; Tight flask on template, fill molding sand to sandbox, obtain sand mold, sand mold comprises sand mold main body, and form die cavity in sand mold main body, the bottom surface of die cavity forms one group of cylinder shape groove;
C, the anti-loose mud core of making; Anti-loose mud core comprises circular platform type foundation, and the bottom surface of foundation is provided with rectangular post, and fill in anti-loose mud core to cylinder shape groove, rectangular post inserts in molding sand, and foundation is arranged in a groove;
D, melting; Moltenly get molten iron, molten iron comprises CE4.4-4.7%, C3.0-3.9%, Si1.8-3.0%, Mn≤0.2%, P≤0.3%, S≤0.03%, Mg0.02-0.065%, Ni0.1-0.2%, nodulizing agent 1.0%, nucleating agent 0.6%, random inoculant 0.1% by mass percent, all the other are Fe;
E, cast; Pouring molten iron in molding sand, the tapping temperature of molten iron is 1480-1500 DEG C, and the teeming temperature of molten iron is 1400-1430 DEG C, and the duration of pouring of molten iron controls in 35 seconds/mould, pours insulation after 5 hours, and cooling obtains foundry goods blank;
F, finished product; Sand removal ball blast is carried out to foundry goods blank, polishing essence obtains finished product after throwing.
In the casting technique of above-mentioned step cover, described molten iron comprises CE4.4-4.7%, C3.3-3.8%, Si1.8-2.2%, Mn≤0.2%, P≤0.05%, S≤0.02%, Mg0.035-0.05%, Ni0.1-0.2%, nodulizing agent 1.0%, nucleating agent 0.6%, random inoculant 0.1% by mass percent, all the other are for Fe.
In the casting technique of aforesaid step cover, described nodulizing agent is magnesium nodulizer or rare-earth nodularizer; Described nucleating agent is cast iron ball graphited inoculant, and described random inoculant is silicon titanate innoculant or silicon strontium nucleating agent.
In the casting technique of aforesaid step cover, also need to heat-treat after cooling obtains foundry goods blank, described thermal treatment first in 2-3 hour, is evenly warming up to 900-950 degree Celsius, stove is as cold as 260-400 degree Celsius, again foundry goods blank is placed in the salt bath of 300-450 degree Celsius and is incubated 5-10 minute, air cooling is to room temperature again, heated to 720-780 degree Celsius at 2-3 hour again, insulation 2-8 hour, 600 degrees Celsius are chilled at 0.5-1 hour stove, air cooling or air-cooled to room temperature again, 550-600 degree Celsius is warming up to again with 2-3 hour, insulation 3-4 hour, with 2-3 hour air cooling or air-cooled to room temperature.
Beneficial effect of the present invention: compared with prior art, the present invention has following characteristics:
(1) the present invention fills in anti-loose mud core in the cylinder shape groove of sand mo(u)ld, after pouring molten iron into, the lug that wall thickness is thicker is formed in cylinder shape groove, the position of anti-loose mud core forms inner chamber, the thickness of cylinder is reduced, accelerates the chilling of this portion of material, solve the loose problem that this part may occur, after this part drills through threaded hole, still can ensure the intensity of this portion of material, greatly increase the qualification rate of product.
(2) the present invention has also done improvement to the thermal treatment of the composition of molten iron, casting process and foundry goods blank, in the thermal treatment of foundry goods blank, first be heated to 900-950 degree Celsius, insulation 1-4 hour, make the whole austenitizing of tissue, in salt bath, be incubated 5-10 minute again, make Cooling Austenite Transformation be that intensity is high, the lower bainite of good toughness.Be warming up to 720-780 degree Celsius again, then through stove cold-peace air cooling to room temperature, obtain nodular troostite graphite structure, after improving, foundry goods improves tensile strength, toughness, unit elongation and yield strength, improves the work-ing life of foundry goods.After testing, tensile strength >=400MPa of the present invention, yield strength >=250MPa, unit elongation >=18; Hardness BHN >=180, Oxygen potential reaches more than 80%.
Below in conjunction with embodiment, the present invention is further illustrated.
Embodiment
Embodiment: the casting technique of step cover, specifically comprises the following steps:
A, making template; Template comprises base plate, and base plate is provided with punch main body, and the surface of punch main body is provided with one group of cylindrical lug;
B, making sand mold; Tight flask on template, fill molding sand to sandbox, obtain sand mold, sand mold comprises sand mold main body, and form die cavity in sand mold main body, the bottom surface of die cavity forms one group of cylinder shape groove;
C, the anti-loose mud core of making; Anti-loose mud core comprises circular platform type foundation, and the bottom surface of foundation is provided with rectangular post, and fill in anti-loose mud core to cylinder shape groove, rectangular post inserts in molding sand, and foundation is arranged in a groove;
D, melting; Moltenly get molten iron, molten iron comprises CE4.4-4.7%, C3.0-3.9%, Si1.8-3.0%, Mn≤0.2%, P≤0.3%, S≤0.03%, Mg0.02-0.065%, Ni0.1-0.2%, nodulizing agent 1.0%, nucleating agent 0.6%, random inoculant 0.1% by mass percent, all the other are Fe;
E, cast; Pouring molten iron in molding sand, the tapping temperature of molten iron is 1480-1500 DEG C, and the teeming temperature of molten iron is 1400-1430 DEG C, and the duration of pouring of molten iron controls in 35 seconds/mould, pours insulation after 5 hours, and cooling obtains foundry goods blank;
F, finished product; Sand removal ball blast is carried out to foundry goods blank, polishing essence obtains finished product after throwing.
Described molten iron comprises CE4.4-4.7%, C3.3-3.8%, Si1.8-2.2%, Mn≤0.2%, P≤0.05%, S≤0.02%, Mg0.035-0.05%, Ni0.1-0.2%, nodulizing agent 1.0%, nucleating agent 0.6%, random inoculant 0.1% by mass percent, all the other are for Fe.Described nodulizing agent is magnesium nodulizer or rare-earth nodularizer; Described nucleating agent is cast iron ball graphited inoculant, and described random inoculant is silicon titanate innoculant or silicon strontium nucleating agent.
Also need to heat-treat after cooling obtains foundry goods blank, described thermal treatment first in 2-3 hour, is evenly warming up to 900-950 degree Celsius, stove is as cold as 260-400 degree Celsius, again foundry goods blank is placed in the salt bath of 300-450 degree Celsius and is incubated 5-10 minute, air cooling is to room temperature again, heated to 720-780 degree Celsius at 2-3 hour again, insulation 2-8 hour, 600 degrees Celsius are chilled at 0.5-1 hour stove, air cooling or air-cooled to room temperature again, 550-600 degree Celsius is warming up to again, insulation 3-4 hour, with 2-3 hour air cooling or air-cooled to room temperature with 2-3 hour.Described salt bath can adopt salt made from earth containing a comparatively high percentage of sodium chloride to bathe, as KNO
350+NaNO
250.
Embodiments of the present invention are not limited to above-described embodiment, and the various changes made under the prerequisite not departing from present inventive concept all belong within protection scope of the present invention.
Claims (4)
1. the casting technique of step cover, is characterized in that: specifically comprise the following steps:
A, making template; Template comprises base plate, and base plate is provided with punch main body, and the surface of punch main body is provided with one group of cylindrical lug;
B, making sand mold; Tight flask on template, fill molding sand to sandbox, obtain sand mold, sand mold comprises sand mold main body, and form die cavity in sand mold main body, the bottom surface of die cavity forms one group of cylinder shape groove;
C, the anti-loose mud core of making; Anti-loose mud core comprises circular platform type foundation, and the bottom surface of foundation is provided with rectangular post, and fill in anti-loose mud core to cylinder shape groove, rectangular post inserts in molding sand, and foundation is arranged in a groove;
D, melting; Moltenly get molten iron, molten iron comprises CE4.4-4.7%, C3.0-3.9%, Si1.8-3.0%, Mn≤0.2%, P≤0.3%, S≤0.03%, Mg0.02-0.065%, Ni0.1-0.2%, nodulizing agent 1.0%, nucleating agent 0.6%, random inoculant 0.1% by mass percent, all the other are Fe;
E, cast; Pouring molten iron in molding sand, the tapping temperature of molten iron is 1480-1500 DEG C, and the teeming temperature of molten iron is 1400-1430 DEG C, and the duration of pouring of molten iron controls in 35 seconds/mould, pours insulation after 5 hours, and cooling obtains foundry goods blank;
F, finished product; Sand removal ball blast is carried out to foundry goods blank, polishing essence obtains finished product after throwing.
2. the casting technique of step cover according to claim 1, is characterized in that: described molten iron comprises CE4.4-4.7%, C3.3-3.8%, Si 1.8-2.2%, Mn≤0.2%, P≤0.05%, S≤0.02%, Mg0.035-0.05%, Ni0.1-0.2%, nodulizing agent 1.0%, nucleating agent 0.6%, random inoculant 0.1% by mass percent, all the other are for Fe.
3. the casting technique of step cover according to claim 2, is characterized in that: described nodulizing agent is magnesium nodulizer or rare-earth nodularizer; Described nucleating agent is cast iron ball graphited inoculant, and described random inoculant is silicon titanate innoculant or silicon strontium nucleating agent.
4. the casting technique of the step cover according to any one of claims 1 to 3, it is characterized in that: also need to heat-treat after cooling obtains foundry goods blank, described thermal treatment first in 2-3 hour, is evenly warming up to 900-950 degree Celsius, stove is as cold as 260-400 degree Celsius, again foundry goods blank is placed in the salt bath of 300-450 degree Celsius and is incubated 5-10 minute, air cooling is to room temperature again, heated to 720-780 degree Celsius at 2-3 hour again, insulation 2-8 hour, 600 degrees Celsius are chilled at 0.5-1 hour stove, air cooling or air-cooled to room temperature again, 550-600 degree Celsius is warming up to again with 2-3 hour, insulation 3-4 hour, with 2-3 hour air cooling or air-cooled to room temperature.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107699777A (en) * | 2017-09-30 | 2018-02-16 | 和县华顺铸造有限公司 | A kind of bearing cap casting technique |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004124170A (en) * | 2002-10-02 | 2004-04-22 | Kodama Imono Kk | Cast iron having excellent molten metal erosion resistance and production method therefor |
| CN1514034A (en) * | 2003-07-30 | 2004-07-21 | 包文华 | Production method of non alloy precooled isothermal bardening austenic globe body |
| 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 |
| CN103194660A (en) * | 2013-04-27 | 2013-07-10 | 莱州新忠耀机械有限公司 | Manufacturing method of low-temperature ferrite nodular cast iron material |
| CN103436772A (en) * | 2013-09-05 | 2013-12-11 | 常州华德机械有限公司 | Low-temperature tough ferrite nodular cast iron of 60 DEG C below zero and preparation method thereof |
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- 2015-05-22 CN CN201510267308.7A patent/CN104962804B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004124170A (en) * | 2002-10-02 | 2004-04-22 | Kodama Imono Kk | Cast iron having excellent molten metal erosion resistance and production method therefor |
| CN1514034A (en) * | 2003-07-30 | 2004-07-21 | 包文华 | Production method of non alloy precooled isothermal bardening austenic globe body |
| 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 |
| CN103194660A (en) * | 2013-04-27 | 2013-07-10 | 莱州新忠耀机械有限公司 | Manufacturing method of low-temperature ferrite nodular cast iron material |
| CN103436772A (en) * | 2013-09-05 | 2013-12-11 | 常州华德机械有限公司 | Low-temperature tough ferrite nodular cast iron of 60 DEG C below zero and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107699777A (en) * | 2017-09-30 | 2018-02-16 | 和县华顺铸造有限公司 | A kind of bearing cap casting technique |
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Denomination of invention: Casting technology for engine main bearing cover Effective date of registration: 20171124 Granted publication date: 20170104 Pledgee: Nanxun Zhejiang rural commercial bank Limited by Share Ltd Pledgor: Zhejiang Ou Ye reaches Machinery Manufacturing Co., Ltd. Registration number: 2017980000532 |
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Address after: 313009 Zhengdao Road 333, Lianshi Town, Nanxun District, Huzhou City, Zhejiang Province Patentee after: Zhejiang Oyeda Machinery Manufacturing Co., Ltd. Address before: 313013 South Side of 18Hao Road, Lianshi Town Industrial Function Zone, Nanxun District, Huzhou City, Zhejiang Province (333 Lianxi Avenue) Patentee before: Zhejiang Ou Ye reaches Machinery Manufacturing Co., Ltd. |
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Change date: 20190109 Registration number: 2017980000532 Pledgor after: Zhejiang Oyeda Machinery Manufacturing Co., Ltd. Pledgor before: Zhejiang Ou Ye reaches Machinery Manufacturing Co., Ltd. |