CN113444963A - Production process of cylinder body for high-density high-performance high-speed rail - Google Patents
Production process of cylinder body for high-density high-performance high-speed rail Download PDFInfo
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- CN113444963A CN113444963A CN202110665992.XA CN202110665992A CN113444963A CN 113444963 A CN113444963 A CN 113444963A CN 202110665992 A CN202110665992 A CN 202110665992A CN 113444963 A CN113444963 A CN 113444963A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/30—Stress-relieving
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a production process of a high-density high-performance cylinder body for a high-speed rail, which comprises the following steps: weighing furnace charge, smelting, tapping, pouring, stress relief annealing treatment and shot blasting finishing. The method can produce the high-density high-performance cylinder body for the high-speed rail, and has the advantages of excellent performance, lower cost and strong market competitiveness of the product.
Description
Technical Field
The invention relates to the technical field of cylinder block production, in particular to a production process of a cylinder block for a high-density high-performance high-speed rail.
Background
The cylinder block for high-speed rail is a part of a braking system, and the requirements are strict.
The appearance requirement is as follows: the surface roughness is Ra12.5, and casting defects are not allowed. The material is HT 250. The tensile strength is more than or equal to 250Mpa, and the hardness is 200/240 HB. The eutectic degree Sc is required to be 0.9-0.95. (Sc ═ C/(4.23-1/3 Si-1/3P). metallographic phase requires that graphite is A type graphite, the size of graphite is 4/5 grade, P content is greater than or equal to 95%, cementite is not allowed, the surface of inner hole is compact after processing, any hole defect is not allowed, surface roughness is Ra0.8, test pressure is 12Bar, leakage does not occur after processing, the production cost of the existing production process is high, and the market competitiveness of the produced product is poor.
Disclosure of Invention
The invention aims to provide a production process of a high-density high-performance brake cylinder block for high-speed rail, aiming at the defects of the prior art.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a production process of a cylinder body for a high-density high-performance high-speed rail comprises the following steps:
s1, weighing furnace burden
The proportion of furnace charge is pig iron: 20%, scrap returns: 30%, scrap steel: 47.8%, carburant: 2.2 percent.
S2, smelting
Adding furnace burden into a smelting furnace, heating to 1400 ℃, sampling and analyzing chemical components, adjusting C, Si content to be qualified by adopting silicon carbide if the components are unqualified, quickly heating to 1550 ℃, preserving heat for 2 minutes, adding Mn, Cu and Sn elements according to the chemical component result before discharging, and adjusting the value of each element to meet the component requirement, C: 3.2-3.4%, Si: 1.9-2.1%, Mn: 0.7%, P is less than or equal to 0.08%, S: 0.08%, Cu: 0.5%, Sn: 0.06 percent.
S3, tapping
After the components of the molten iron are qualified, floating slag in the furnace is firstly removed before the molten iron is taken out of the furnace, and after the slag is removed and pulled out, 0.4 percent of inoculant is added into the bottom of the ladle, and simultaneously 0.2 percent of inoculant is added into the furnace along with the flow in the tapping chute.
S4, pouring
When the temperature of the molten iron is 1360 and 1420 ℃, the ladle nozzle is aligned to the pouring cup to perform slow pouring and then perform fast pouring, when the pouring is completed, the pouring cup is withdrawn to perform slow pouring, after the mold filling is completed, the molten iron is poured again, and the molten iron is cooled for 60 to 90 minutes.
S5 stress relief annealing treatment
The annealing temperature is 500-550 ℃, the heat preservation is 90Min, and then the furnace cooling is carried out to 300 ℃, and the cooling speed is 40 ℃/H.
S6 shot blasting finishing
And (4) cleaning flash and burrs and performing fine shot blasting treatment.
The further technical scheme is that Z14 pig iron is adopted as the pig iron, the pig iron meets the GB/T718-2005 standard requirement, C is more than or equal to 3.3 percent, and Si: 1.25 to 1.6%, Mn: 0.5-0.9%, P less than or equal to 0.06%, S less than or equal to 0.05%, no corrosion and no impurity on the surface.
The further technical proposal is that the waste steel adopts high-quality carbon waste steel, the C is less than or equal to 0.50 percent, the Si is less than or equal to 0.6 percent, the Mn is less than or equal to 0.8 percent, the P is less than or equal to 0.04 percent, the S is less than or equal to 0.04 percent, the Ti is less than or equal to 0.03 percent, the Cr is less than or equal to 0.3 percent, the A1 is less than or equal to 0.05 percent, and the rest alloy is 0.05 percent; the width is less than or equal to 500mm, the thickness is more than or equal to 0.5mm, and the length is less than or equal to 100 mm.
The recarburizer has fixed carbon content not less than 95%, sulfur content not more than 0.5%, granularity of 0.5-6mm and nitrogen content not more than 400 PPm.
According to a further technical scheme, a spectrometer is used for analyzing chemical components in the step S2.
The further technical scheme is that the ratio of Si: 63%, C: 27 percent of S is less than or equal to 0.03 percent, 0.01 percent of P is less than or equal to 0.01 percent, and the granularity is 1-5 mm.
The further technical proposal is that the inoculant adopts silicon barium calcium inoculant with the granularity of 1-3 mm.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the method can produce the high-density high-performance cylinder body for the high-speed rail, and has the advantages of excellent performance, lower cost and strong market competitiveness of the product.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, a production process of a cylinder block for a high-density high-performance high-speed rail comprises the following steps:
s1, weighing furnace burden
The proportion of furnace charge is pig iron: 20%, scrap returns: 30%, scrap steel: 47.8%, carburant: 2.2 percent.
The pig iron is Z14 pig iron, meets the GB/T718-2005 standard requirement, C is more than or equal to 3.3%, and Si: 1.25 to 1.6%, Mn: 0.5-0.9%, P less than or equal to 0.06%, S less than or equal to 0.05%, no corrosion and no impurity on the surface. The waste steel is high-quality carbon waste steel, C is less than or equal to 0.50 percent, Si is less than or equal to 0.6 percent, Mn is less than or equal to 0.8 percent, P is less than or equal to 0.04 percent, S is less than or equal to 0.04 percent, Ti is less than or equal to 0.03 percent, Cr is less than or equal to 0.3 percent, A1 is less than or equal to 0.05 percent, and the rest alloy is 0.05 percent; the width is less than or equal to 500mm, the thickness is more than or equal to 0.5mm, the length is less than or equal to 100mm, and overlength and overlarge scrap steel is supplied after being cut. The surface of the scrap steel is allowed to be slightly oxidized, cannot be seriously rusted, and cannot be greasy. The scrap steel purchased in each batch is similar in material quality and not less than 80%, the scrap steel made of different materials is not more than 20%, and stainless steel, alloy steel, pig iron and nonferrous metal, electroplate and the like are forbidden. The waste steel is not allowed to have a pipe-shaped object with two closed ends to seal a vessel. The recarburizer contains more than or equal to 95 percent of fixed carbon, less than or equal to 0.5 percent of sulfur, 0.5-6mm of granularity and less than or equal to 400PPm of nitrogen content, and is packaged by plastic bags to prevent moisture and water.
S2, smelting
Adding furnace charge into a smelting furnace, quickly sampling when the temperature is raised to 1400 ℃, analyzing chemical components by using a spectrometer, and if the components are unqualified, adopting Si: 63%, C: 27 percent of S is less than or equal to 0.03 percent of S, less than or equal to 0.01 percent of P, C, Si content is adjusted to be qualified by silicon carbide with granularity of 1-5mm, the temperature is quickly raised to 1550 ℃, the temperature is kept for 2 minutes, Mn, Cu and Sn elements are added according to chemical composition results before tapping, the values of all elements are adjusted to meet the composition requirements, C: 3.2-3.4%, Si: 1.9-2.1%, Mn: 0.7%, P is less than or equal to 0.08%, S: 0.08%, Cu: 0.5%, Sn: 0.06 percent.
S3, tapping
After the components of the molten iron are qualified, firstly, scums in the furnace are removed completely before the molten iron is taken out of the furnace, after the scums are removed and pulled completely, 0.4 percent of silicon-barium-calcium inoculant with the granularity of 1-3mm is added into the bottom of the ladle, and simultaneously, 0.2 percent of silicon-barium-calcium inoculant with the granularity of 1-3mm is added into the furnace charge along with the flow in the tapping chute. In order to completely remove the slag, a slag conglomeration agent is scattered into the molten iron.
S4, pouring
When the temperature of the molten iron is 1360 and 1420 ℃, the ladle nozzle is aligned to the pouring cup to perform slow pouring and then perform fast pouring, when the pouring is completed, the pouring cup is withdrawn to perform slow pouring, after the mold filling is completed, the molten iron is poured again, and the molten iron is cooled for 60 to 90 minutes.
S5 stress relief annealing treatment
In order to reduce stress and ensure the processed dimension to be unchanged, stress relief annealing treatment is carried out: the annealing temperature is 500-550 ℃, the heat preservation is 90Min, and then the furnace cooling is carried out to 300 ℃, and the cooling speed is 40 ℃/H.
S6 shot blasting finishing
And (4) cleaning flash and burrs and performing fine shot blasting treatment.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A production process of a cylinder body for a high-density high-performance high-speed rail is characterized by comprising the following steps:
s1, weighing furnace burden
The proportion of furnace charge is pig iron: 20%, scrap returns: 30%, scrap steel: 47.8%, carburant: 2.2 percent;
s2, smelting
Adding furnace burden into a smelting furnace, heating to 1400 ℃, sampling and analyzing chemical components, adjusting C, Si content to be qualified by adopting silicon carbide if the components are unqualified, quickly heating to 1550 ℃, preserving heat for 2 minutes, adding Mn, Cu and Sn elements according to the chemical component result before discharging, and adjusting the value of each element to meet the component requirement, C: 3.2-3.4%, Si: 1.9-2.1%, Mn: 0.7%, P is less than or equal to 0.08%, S: 0.08%, Cu: 0.5%, Sn: 0.06 percent;
s3, tapping
After the components of the molten iron are qualified, firstly removing the scum in the furnace before discharging the molten iron out of the furnace, adding an inoculant accounting for 0.4 percent of the furnace charge at the bottom of the ladle after removing the scum and removing the scum, and simultaneously adding an inoculant accounting for 0.2 percent of the furnace charge along with the flow in an iron tapping groove;
s4, pouring
When the temperature of molten iron is 1360-1420 ℃, the ladle nozzle is aligned to the pouring cup to perform slow pouring and then perform fast pouring, when the pouring is completed, the ladle nozzle performs slow flow collection pouring, after the pouring cup is settled after the mold filling is completed, the molten iron is poured again, and the molten iron is cooled for 60 to 90 minutes;
s5 stress relief annealing treatment
The annealing temperature is 500-550 ℃, the heat preservation is 90Min, and then the annealing furnace is cooled to 300 ℃, and the cooling speed is 40 ℃/H;
s6 shot blasting finishing
And (4) cleaning flash and burrs and performing fine shot blasting treatment.
2. The production process of the cylinder block for the high-density high-performance high-speed rail as claimed in claim 1, wherein the pig iron is Z14 pig iron, the pig iron meets the GB/T718-2005 standard requirement, C is not less than 3.3%, Si: 1.25 to 1.6%, Mn: 0.5-0.9%, P less than or equal to 0.06%, S less than or equal to 0.05%, no corrosion and no impurity on the surface.
3. The production process of a cylinder block for a high-density high-performance high-speed rail as claimed in claim 1, wherein the scrap steel is high-quality carbon scrap steel, C is less than or equal to 0.50%, Si is less than or equal to 0.6%, Mn is less than or equal to 0.8%, P is less than or equal to 0.04%, S is less than or equal to 0.04%, Ti is less than or equal to 0.03%, Cr is less than or equal to 0.3%, A1 is less than or equal to 0.05%, and the balance alloy is 0.05%; the width is less than or equal to 500mm, the thickness is more than or equal to 0.5mm, and the length is less than or equal to 100 mm.
4. The production process of the cylinder block for the high-density high-performance high-speed rail as claimed in claim 1, wherein the fixed carbon in the carburant is not less than 95%, the sulfur content is not more than 0.5%, the particle size is 0.5-6mm, and the nitrogen content is not more than 400 PPm.
5. The process for producing a cylinder block for a high-density high-performance high-speed rail according to claim 1, wherein the chemical composition is analyzed by a spectrometer in step S2.
6. The process for producing a cylinder block for a high-density high-performance high-speed railway according to claim 1, wherein the ratio of Si: 63%, C: 27 percent of S is less than or equal to 0.03 percent, 0.01 percent of P is less than or equal to 0.01 percent, and the granularity is 1-5 mm.
7. The process for producing a cylinder block for a high-density high-performance high-speed rail as claimed in claim 1, wherein said inoculant is a calcium-silicon inoculant with a particle size of 1-3 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110665992.XA CN113444963A (en) | 2021-06-16 | 2021-06-16 | Production process of cylinder body for high-density high-performance high-speed rail |
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| CN202110665992.XA CN113444963A (en) | 2021-06-16 | 2021-06-16 | Production process of cylinder body for high-density high-performance high-speed rail |
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| CN113444963A true CN113444963A (en) | 2021-09-28 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06207253A (en) * | 1993-01-06 | 1994-07-26 | Toshiba Corp | Iron base sliding part material |
| CN104178684A (en) * | 2014-09-03 | 2014-12-03 | 河北丰维机械制造有限公司 | Smelting method of chromium-molybdenum-copper-nickel-tin-antimony low-alloy wear-resistant cast iron |
| US20150053077A1 (en) * | 2013-08-21 | 2015-02-26 | Kia Motors Corporation | Grey cast iron having excellent durability |
| CN106048401A (en) * | 2016-08-15 | 2016-10-26 | 合肥江淮铸造有限责任公司 | Smelting and pouring process of gasoline engine cylinder body |
| CN108637181A (en) * | 2018-04-24 | 2018-10-12 | 上柴动力海安有限公司 | A kind of casting technique of heavy duty diesel engine cylinder body |
| CN110079726A (en) * | 2019-06-01 | 2019-08-02 | 亚新科国际铸造（山西）有限公司 | A kind of technique improving gray cast iron engine cylinder cover room temperature drawingand pressing fatigue intensity |
| CN111906253A (en) * | 2020-08-05 | 2020-11-10 | 陕西柴油机重工有限公司 | Diesel engine cylinder block casting forming method and diesel engine cylinder block casting |
-
2021
- 2021-06-16 CN CN202110665992.XA patent/CN113444963A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06207253A (en) * | 1993-01-06 | 1994-07-26 | Toshiba Corp | Iron base sliding part material |
| US20150053077A1 (en) * | 2013-08-21 | 2015-02-26 | Kia Motors Corporation | Grey cast iron having excellent durability |
| CN104178684A (en) * | 2014-09-03 | 2014-12-03 | 河北丰维机械制造有限公司 | Smelting method of chromium-molybdenum-copper-nickel-tin-antimony low-alloy wear-resistant cast iron |
| CN106048401A (en) * | 2016-08-15 | 2016-10-26 | 合肥江淮铸造有限责任公司 | Smelting and pouring process of gasoline engine cylinder body |
| CN108637181A (en) * | 2018-04-24 | 2018-10-12 | 上柴动力海安有限公司 | A kind of casting technique of heavy duty diesel engine cylinder body |
| CN110079726A (en) * | 2019-06-01 | 2019-08-02 | 亚新科国际铸造（山西）有限公司 | A kind of technique improving gray cast iron engine cylinder cover room temperature drawingand pressing fatigue intensity |
| CN111906253A (en) * | 2020-08-05 | 2020-11-10 | 陕西柴油机重工有限公司 | Diesel engine cylinder block casting forming method and diesel engine cylinder block casting |
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