CN102873279B - Method for producing heat-resistant steel automobile exhaust pipes by iron mold sand lining process - Google Patents
Method for producing heat-resistant steel automobile exhaust pipes by iron mold sand lining process Download PDFInfo
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- CN102873279B CN102873279B CN201210369595.9A CN201210369595A CN102873279B CN 102873279 B CN102873279 B CN 102873279B CN 201210369595 A CN201210369595 A CN 201210369595A CN 102873279 B CN102873279 B CN 102873279B
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Abstract
The invention discloses a method for producing heat-resistant steel automobile exhaust pipes by an iron mold sand lining process. The method includes modeling, core feeding, flask combining, casting, sand shakeout. Chilling position in casting of automobile exhaust pipes is determined before modeling. The special iron mold sand lining process is applied to production of heat-resistant steel, the characteristic that a sand shell cannot be separated from an iron mold during the modeling can be utilized, deformation of the sand shell is avoided, and accordingly precision of the casting is increased. Chilling points are controlled manually by controlling thickness of the sand shell, flasks of the iron mold can function in chilling and feeding sufficiently for places needed to be chilled, so that compactedness of the casting is guaranteed, product yield and quality are improved.
Description
Technical field
The present invention relates to a kind of production method of automobile exhaust pipe, be specifically related to a kind of production method of automobile exhaust pipe of heat-resisting steel material.
Background technology
In recent years, along with the develop rapidly of auto industry, consumer requires also more and more higher to the overall performance of automobile, specifically further strict for then showing as the requirement of its semifinished product precision, quality and high-temperature behavior automobile exhaust pipe, when all kinds of high request, the some shortcomings part of Conventional processing methods just highlights gradually.
At present, most heat resisting steel foundry goods adopts the method for sand casting, these class methods are usually used in general heat resisting steel cast product, because heat-resisting steel material amount of contraction is large, the amount of contraction of cast steel must be supplied with enough molten steel, therefore in general the yield rate of cast steel product is lower, simultaneously for some complex structure and precision quality requires high product, has certain limitation by these class methods.For the production of automobile exhaust pipe, because its structure is more complicated, semifinished product precision requires high, if with heat-resisting steel material, application common sand casting technique is difficult to standard, yield rate and yield rate lower, limit the application of heat resisting steel material in automobile exhaust pipe.
Summary of the invention
The technical problem to be solved in the present invention overcomes existing defect, provides the method for the high device for sand coated iron mould explained hereafter heat resisting steel automobile exhaust pipe of a kind of yield rate.
Object of the present invention carrys out specific implementation by the following technical programs:
A method for device for sand coated iron mould explained hereafter heat resisting steel automobile exhaust pipe, comprise moulding, lower core mould assembling, cast, knockout, first determine the Quench position in automobile exhaust pipe casting pouring before described moulding, concrete operations technique is:
The determination of step one, Quench position:
A. first analyze profile and the wall thickness feature of automobile exhaust pipe, tentatively determine the Quench position in casting pouring;
B. the gap after mould and sandbox are adjacent to is adjusted according to the Quench position of foundry goods, and then determine the thickness of arenaceous shell and accurate Quench position, arenaceous shell integral thickness is 8-10mm, and the arenaceous shell thickness needing Quench position is 3-5mm, needs the arenaceous shell thickness being incubated position to be 12-16mm;
Step 2, moulding:
A. sandbox heating: sandbox is heated with radiation heating baking oven at the bottom of infrared ray, wherein top box heating-up temperature is between 180-220 DEG C, and nowel heating-up temperature is between 140-180 DEG C, and described top box temperature and nowel temperature control by electronic temperature controller, and winter capping, summer removes the limit;
B. sand is penetrated: start to carry out penetrating sand after mould and sandbox being fitted closely, wherein shooting pressure is 0.5-0.7MPa;
C. repair type: it is whether complete that sand is penetrated in inspection, blow off floating sand in die cavity with air gun, make sandbox surface without quick sand;
Step 3, lower core mould assembling:
A. play core: put down gently by core in sandbox arenaceous shell, require the complete nothing of core to collide with and fit closely with arenaceous shell after transferring, without swinging, having transferred rear air gun and having blown off quick sand in die cavity;
B. mould assembling: nowel is transported to mould assembling place, controls closing machine and hangs and get top box and at the uniform velocity to fall mould assembling, sell in mould assembling process, hole aligns, after mould assembling, fasten with case, entering jet-burner placement filter and cup, seal with joint sealing cream, be then transported to pouring platform to be poured;
Step 4, smelting and pouring:
A. melting: by the ferrosilicon of proportional quantity, ferrochrome, molybdenum-iron, steel scrap, electrolytic manganese, electrolytic nickel with medium-frequency induction furnace melting to 1650-1680 DEG C;
B. detect adjustment: in this temperature range to stove in molten steel carry out sample analysis, detect its each chemical composition mass fraction with spectroanalysis instrument, and according to detection data carry out composition adjustment till its composition meets the demands;
C. remove the gred: after detecting adjustment, in stove, be sprinkled into deslagging agent, with skimmer bar except removing dross;
D. to come out of the stove cast: molten steel transposition is entered in casting ladle, tapping temperature controls at 1650 DEG C-1670 DEG C, after coming out of the stove, in casting ladle, the temperature fall off rate of molten steel is 8-12 DEG C/min, temperature-measuring gun is adopted to measure liquid steel temperature in casting ladle before cast, when temperature is down to 1560 DEG C-1580 DEG C, start cast, during cast, at the uniform velocity will shake that casting ladle change is not pourable too quicklyly also can not stop, every case casting process completes within 7-9 second, pours into a mould last case temperature and controls be not less than 1550 DEG C;
Step 5, knockout:
A. remove cup: after casting complete, remove cup after 3 minutes;
B. unpack: unpack with after shakeout knockout after being poured 30 minutes, spray part is neatly stacked in order.
Preferably, in described step one, arenaceous shell integral thickness is 10mm, and the arenaceous shell thickness needing Quench position is 3mm, needs the arenaceous shell thickness being incubated position to be 15mm.
Preferably, in described step 2, top box heating-up temperature is 200 DEG C, and nowel heating-up temperature is 170 DEG C, and shooting pressure is 0.6MPa.
Preferably, in described step 4, tapping temperature controls at 1670 DEG C, and when temperature is down to 1570 DEG C, start cast, casting process completes within 7-8 second.
Beneficial effect of the present invention:
Special iron die sand casting process is applied to production heat resisting steel product and arenaceous shell in its formative technology then can be utilized not depart from the feature of irony mould by the present invention, ensure arenaceous shell not modification, thus raising casting accuracy, thickness simultaneously by controlling arenaceous shell carrys out people for controlled chilling point, swage sandbox is made to give full play to Quench feeding effect needing the place of Quench, thus ensure the packing of foundry goods, improve yield rate and product quality.
Detailed description of the invention
Below the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
embodiment 1:
A kind of method of device for sand coated iron mould explained hereafter heat resisting steel automobile exhaust pipe:
1, first analyze profile and the wall thickness feature of automobile exhaust pipe, tentatively determine the Quench position in casting pouring.
2, the gap after mould and sandbox are adjacent to is adjusted according to the Quench position of foundry goods, and then determine the thickness of arenaceous shell and accurate Quench position, arenaceous shell integral thickness is 10mm, and the arenaceous shell thickness needing Quench position is 3mm, needs the arenaceous shell thickness being incubated position to be 15mm.
3, heat sandbox with radiation heating baking oven at the bottom of infrared ray, wherein top box heating-up temperature is 200 DEG C, and nowel heating-up temperature is between 170 DEG C, and described top box temperature and nowel temperature control by electronic temperature controller, and winter capping, summer removes the limit;
4, start to carry out penetrating sand after mould and sandbox being fitted closely, wherein shooting pressure is 0.6MPa;
5, check that whether penetrate sand complete, blow off floating sand in die cavity with air gun, make sandbox surface without quick sand; Core is put down gently in sandbox arenaceous shell, require the complete nothing of core to collide with and fit closely with arenaceous shell after transferring, without swinging, having transferred rear air gun and having blown off quick sand in die cavity;
6, nowel is transported to mould assembling place, controls closing machine and hang and get top box and at the uniform velocity to fall mould assembling, sell in mould assembling process, hole aligns, after mould assembling, fasten with case, place filter and cup entering jet-burner, seal with joint sealing cream, be then transported to pouring platform to be poured;
7, by the ferrosilicon of proportional quantity, ferrochrome, molybdenum-iron, steel scrap, electrolytic manganese, electrolytic nickel medium-frequency induction furnace melting to 1650 DEG C;
8, in this temperature range to stove in molten steel carry out sample analysis, detect its each chemical composition mass fraction with spectroanalysis instrument, and according to detection data carry out composition adjustment till its composition meets the demands;
9, in stove, deslagging agent is sprinkled into after detecting adjustment, with skimmer bar except removing dross;
Molten steel transposition is entered in casting ladle, tapping temperature controls at 1650 DEG C, after coming out of the stove, in casting ladle, the temperature fall off rate of molten steel is 8 DEG C/min, temperature-measuring gun is adopted to measure liquid steel temperature in casting ladle before cast, when temperature is down to 1560 DEG C, start cast, during cast, at the uniform velocity will shake that casting ladle change is not pourable too quicklyly also can not stop, every case casting process completed within 7 seconds, poured into a mould last case temperature and controlled be not less than 1550 DEG C;
10, after casting complete, cup is removed after 3 minutes;
11, unpack with after shakeout knockout after being poured 30 minutes, spray part is neatly stacked in order.
embodiment 2:
A kind of method of device for sand coated iron mould explained hereafter heat resisting steel automobile exhaust pipe:
1, first analyze profile and the wall thickness feature of automobile exhaust pipe, tentatively determine the Quench position in casting pouring.
2, the gap after mould and sandbox are adjacent to is adjusted according to the Quench position of foundry goods, and then determine the thickness of arenaceous shell and accurate Quench position, arenaceous shell integral thickness is 10mm, and the arenaceous shell thickness needing Quench position is 3mm, needs the arenaceous shell thickness being incubated position to be 15mm.
3, with radiation heating baking oven at the bottom of infrared ray, sandbox is heated, wherein top box heating-up temperature is between 220 DEG C, and nowel heating-up temperature is between 180 DEG C, and described top box temperature and nowel temperature control by electronic temperature controller, and winter capping, summer removes the limit;
4, start to carry out penetrating sand after mould and sandbox being fitted closely, wherein shooting pressure is 0.5MPa;
5, check that whether penetrate sand complete, blow off floating sand in die cavity with air gun, make sandbox surface without quick sand; Core is put down gently in sandbox arenaceous shell, require the complete nothing of core to collide with and fit closely with arenaceous shell after transferring, without swinging, having transferred rear air gun and having blown off quick sand in die cavity;
6, nowel is transported to mould assembling place, controls closing machine and hang and get top box and at the uniform velocity to fall mould assembling, sell in mould assembling process, hole aligns, after mould assembling, fasten with case, place filter and cup entering jet-burner, seal with joint sealing cream, be then transported to pouring platform to be poured;
7, by the ferrosilicon of proportional quantity, ferrochrome, molybdenum-iron, steel scrap, electrolytic manganese, electrolytic nickel medium-frequency induction furnace melting to 1650 DEG C;
8, in this temperature range to stove in molten steel carry out sample analysis, detect its each chemical composition mass fraction with spectroanalysis instrument, and according to detection data carry out composition adjustment till its composition meets the demands;
9, in stove, deslagging agent is sprinkled into after detecting adjustment, with skimmer bar except removing dross;
Molten steel transposition is entered in casting ladle, tapping temperature controls at 1650 DEG C, after coming out of the stove, in casting ladle, the temperature fall off rate of molten steel is 12 DEG C/min, temperature-measuring gun is adopted to measure liquid steel temperature in casting ladle before cast, when temperature is down to 1580 DEG C, start cast, during cast, at the uniform velocity will shake that casting ladle change is not pourable too quicklyly also can not stop, every case casting process completed within 8 seconds, poured into a mould last case temperature and controlled be not less than 1550 DEG C;
10, after casting complete, cup is removed after 3 minutes;
11, unpack with after shakeout knockout after being poured 30 minutes, spray part is neatly stacked in order.
embodiment 3:
A kind of method of device for sand coated iron mould explained hereafter heat resisting steel automobile exhaust pipe:
1, first analyze profile and the wall thickness feature of automobile exhaust pipe, tentatively determine the Quench position in casting pouring.
2, the gap after mould and sandbox are adjacent to is adjusted according to the Quench position of foundry goods, and then determine the thickness of arenaceous shell and accurate Quench position, arenaceous shell integral thickness is 8mm, and the arenaceous shell thickness needing Quench position is 3mm, needs the arenaceous shell thickness being incubated position to be 12mm.
3, with radiation heating baking oven at the bottom of infrared ray, sandbox is heated, wherein top box heating-up temperature is between 180 DEG C, and nowel heating-up temperature is between 140 DEG C, and described top box temperature and nowel temperature control by electronic temperature controller, and winter capping, summer removes the limit;
4, start to carry out penetrating sand after mould and sandbox being fitted closely, wherein shooting pressure is 0.7MPa;
5, check that whether penetrate sand complete, blow off floating sand in die cavity with air gun, make sandbox surface without quick sand; Core is put down gently in sandbox arenaceous shell, require the complete nothing of core to collide with and fit closely with arenaceous shell after transferring, without swinging, having transferred rear air gun and having blown off quick sand in die cavity;
6, nowel is transported to mould assembling place, controls closing machine and hang and get top box and at the uniform velocity to fall mould assembling, sell in mould assembling process, hole aligns, after mould assembling, fasten with case, place filter and cup entering jet-burner, seal with joint sealing cream, be then transported to pouring platform to be poured;
7, by the ferrosilicon of proportional quantity, ferrochrome, molybdenum-iron, steel scrap, electrolytic manganese, electrolytic nickel medium-frequency induction furnace melting to 1680 DEG C;
8, in this temperature range to stove in molten steel carry out sample analysis, detect its each chemical composition mass fraction with spectroanalysis instrument, and according to detection data carry out composition adjustment till its composition meets the demands;
9, in stove, deslagging agent is sprinkled into after detecting adjustment, with skimmer bar except removing dross;
Molten steel transposition is entered in casting ladle, tapping temperature controls at 1670 DEG C, after coming out of the stove, in casting ladle, the temperature fall off rate of molten steel is 12 DEG C/min, temperature-measuring gun is adopted to measure liquid steel temperature in casting ladle before cast, when temperature is down to 1580 DEG C, start cast, during cast, at the uniform velocity will shake that casting ladle change is not pourable too quicklyly also can not stop, every case casting process completed within 7 seconds, poured into a mould last case temperature and controlled be not less than 1550 DEG C;
10, after casting complete, cup is removed after 3 minutes;
11, unpack with after shakeout knockout after being poured 30 minutes, spray part is neatly stacked in order.
embodiment 4:
A kind of method of device for sand coated iron mould explained hereafter heat resisting steel automobile exhaust pipe:
1, first analyze profile and the wall thickness feature of automobile exhaust pipe, tentatively determine the Quench position in casting pouring.
2, the gap after mould and sandbox are adjacent to is adjusted according to the Quench position of foundry goods, and then determine the thickness of arenaceous shell and accurate Quench position, arenaceous shell integral thickness is 10mm, and the arenaceous shell thickness needing Quench position is 5mm, needs the arenaceous shell thickness being incubated position to be 16mm.
3, with radiation heating baking oven at the bottom of infrared ray, sandbox is heated, wherein top box heating-up temperature is between 220 DEG C, and nowel heating-up temperature is between 180 DEG C, and described top box temperature and nowel temperature control by electronic temperature controller, and winter capping, summer removes the limit;
4, start to carry out penetrating sand after mould and sandbox being fitted closely, wherein shooting pressure is 0.7MPa;
5, check that whether penetrate sand complete, blow off floating sand in die cavity with air gun, make sandbox surface without quick sand; Core is put down gently in sandbox arenaceous shell, require the complete nothing of core to collide with and fit closely with arenaceous shell after transferring, without swinging, having transferred rear air gun and having blown off quick sand in die cavity;
6, nowel is transported to mould assembling place, controls closing machine and hang and get top box and at the uniform velocity to fall mould assembling, sell in mould assembling process, hole aligns, after mould assembling, fasten with case, place filter and cup entering jet-burner, seal with joint sealing cream, be then transported to pouring platform to be poured;
7, by the ferrosilicon of proportional quantity, ferrochrome, molybdenum-iron, steel scrap, electrolytic manganese, electrolytic nickel medium-frequency induction furnace melting to 1670 DEG C;
8, in this temperature range to stove in molten steel carry out sample analysis, detect its each chemical composition mass fraction with spectroanalysis instrument, and according to detection data carry out composition adjustment till its composition meets the demands;
9, in stove, deslagging agent is sprinkled into after detecting adjustment, with skimmer bar except removing dross;
Molten steel transposition is entered in casting ladle, tapping temperature controls at 1660 DEG C, after coming out of the stove, in casting ladle, the temperature fall off rate of molten steel is 10 DEG C/min, temperature-measuring gun is adopted to measure liquid steel temperature in casting ladle before cast, when temperature is down to 1570 DEG C, start cast, during cast, at the uniform velocity will shake that casting ladle change is not pourable too quicklyly also can not stop, every case casting process completed within 9 seconds, poured into a mould last case temperature and controlled be not less than 1550 DEG C;
10, after casting complete, cup is removed after 3 minutes;
11, unpack with after shakeout knockout after being poured 30 minutes, spray part is neatly stacked in order.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. the method with device for sand coated iron mould explained hereafter heat resisting steel automobile exhaust pipe, comprise moulding, lower core mould assembling, cast, knockout, it is characterized in that: first determine the Quench position in automobile exhaust pipe casting pouring before described moulding, concrete operations technique is:
The determination of step one, Quench position:
A. first analyze profile and the wall thickness feature of automobile exhaust pipe, tentatively determine the Quench position in casting pouring;
B. the gap after mould and sandbox are adjacent to is adjusted according to the Quench position of foundry goods, and then determine the thickness of arenaceous shell and accurate Quench position, arenaceous shell integral thickness is 10mm, and the arenaceous shell thickness needing Quench position is 3mm, needs the arenaceous shell thickness being incubated position to be 15mm;
Step 2, moulding:
Sandbox heats: heat sandbox with radiation heating baking oven at the bottom of infrared ray, wherein top box heating-up temperature is 200 DEG C, and nowel heating-up temperature is 170 DEG C, and described top box temperature and nowel temperature control by electronic temperature controller;
Penetrate sand: start to carry out penetrating sand after mould and sandbox being fitted closely, wherein shooting pressure is 0.6MPa;
Repair type: it is whether complete that sand is penetrated in inspection, blow off floating sand in die cavity with air gun, make sandbox surface without floating sand;
Step 3, lower core mould assembling:
Lower core: put down gently by core in sandbox arenaceous shell, requires the complete nothing of core to collide with and fits closely with arenaceous shell after transferring, and without swinging, having transferred rear air gun and having blown off floating sand in die cavity;
Mould assembling: nowel is transported to mould assembling place, controls closing machine and hangs and get top box and at the uniform velocity to fall mould assembling, sell in mould assembling process, hole aligns, after mould assembling, fasten with case, entering jet-burner placement filter and cup, seal with joint sealing cream, be then transported to pouring platform to be poured;
Step 4, smelting and pouring:
Melting: by the ferrosilicon of proportional quantity, ferrochrome, molybdenum-iron, steel scrap, electrolytic manganese, electrolytic nickel with medium-frequency induction furnace melting to 1650-1680 DEG C;
Detect adjustment: in this temperature range to stove in molten steel carry out sample analysis, detect its each chemical composition mass fraction with spectroanalysis instrument, and according to detection data carry out composition adjustment till its composition meets the demands;
Slagging-off: be sprinkled into deslagging agent after detecting adjustment in stove, with skimmer bar except removing dross;
To come out of the stove cast: molten steel transposition is entered in casting ladle, tapping temperature controls at 1650 DEG C-1670 DEG C, after coming out of the stove, in casting ladle, the temperature fall off rate of molten steel is 8-12 DEG C/min, temperature-measuring gun is adopted to measure liquid steel temperature in casting ladle before cast, when temperature is down to 1560 DEG C-1580 DEG C, start cast, during cast, at the uniform velocity will shake that casting ladle change is not pourable too quicklyly also can not stop, every case casting process completes within 7-9 second, pours into a mould last case temperature and controls be not less than 1550 DEG C;
Step 5, knockout:
Remove cup: after casting complete, remove cup after 3 minutes;
Unpack: unpack with after shakeout knockout after being poured 30 minutes, spray part is neatly stacked in order.
2. the method for device for sand coated iron mould explained hereafter heat resisting steel automobile exhaust pipe according to claim 1, it is characterized in that: in described step 4, tapping temperature controls at 1670 DEG C, and when temperature is down to 1570 DEG C, start cast, casting process completes within 7-8 second.
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