CN106435347A - Automobile brake foundry technology - Google Patents

Automobile brake foundry technology Download PDF

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Publication number
CN106435347A
CN106435347A CN201610936677.5A CN201610936677A CN106435347A CN 106435347 A CN106435347 A CN 106435347A CN 201610936677 A CN201610936677 A CN 201610936677A CN 106435347 A CN106435347 A CN 106435347A
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CN
China
Prior art keywords
iron
copper
molybdenum
heated
automobile brake
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201610936677.5A
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Chinese (zh)
Inventor
郭传发
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ma'anshan Shunfa Machinery Manufacturing Co Ltd
Original Assignee
Ma'anshan Shunfa Machinery Manufacturing Co Ltd
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Filing date
Publication date
Application filed by Ma'anshan Shunfa Machinery Manufacturing Co Ltd filed Critical Ma'anshan Shunfa Machinery Manufacturing Co Ltd
Priority to CN201610936677.5A priority Critical patent/CN106435347A/en
Publication of CN106435347A publication Critical patent/CN106435347A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • 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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • C21D5/00—Heat treatments of cast-iron
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/06—Cast-iron alloys containing chromium
    • C22C37/08—Cast-iron alloys containing chromium with nickel
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/006—Graphite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/009—Pearlite
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Braking Arrangements (AREA)

Abstract

The invention discloses automobile brake foundry technology. The foundry technology comprises the following steps: (1) molten iron pouring; (2) heat treatment; (3) machining; (4) warehousing after inspection. The foundry technology has the beneficial effects that by pouring copper and ferromolybdenum together with molten iron and cooperating with ultrasonic treatment, the strength, hardness and impact toughness are obviously improved, the fatigue strength and high temperature properties are improved, the section properties are improved, the wear resistance is improved, pearlite and graphite are refined, the chill of the thin section is reduced and the large section structure sensitivity is improved.

Description

A kind of automobile brake part casting technique
Technical field
The present invention relates to automobile casting field, more particularly to a kind of automobile brake part casting technique.
Background technology
At present, automobile brake part plays vital effect in whole automobile is constituted, but, current method is manufactured Automobile brake part hardness higher, in use, easily occur crackle too early, especially in brake process, be also easy to produce abnormal sound And shake.
Content of the invention
It is an object of the invention to provide a kind of automobile brake part casting technique, is achieved through the following technical solutions：
A kind of automobile brake part casting technique, comprises the following steps：
1. a certain amount of steel scrap is put in middle frequency furnace and molten steel is fused into, treat that the temperature in middle frequency furnace rises to 1000-1080 DEG C when, then put into steel ingot, the pig iron and foundry returns, then deslagging, add ferromanganese and Antaciron after deslagging, treat in middle frequency furnace Temperature is tapped a blast furnace when rising to 1380 DEG C, at this moment, a certain amount of copper and molybdenum-iron is poured into a mould with molten iron, and the 5th minute of cast is opened Begin using ultrasonic Treatment 3 minutes, cast took out brake component foundry goods, the weight hundred of each chemical composition of brake component foundry goods after 15 minutes Divide ratio meet following requirements：Carbon 2.13-2.44%, manganese 0.12-0.15%, vanadium 0.04-0.06%, silicon 0.89-1.12%, tungsten 0.01-0.03%, nickel 0.42-0.45%, chromium 0.20-0.30%, copper 0.32-0.38%, molybdenum 0.10-0.12%, phosphorus≤0.0022%, sulfur ≤ 0.0033%, balance of ferrum；
2. heat treatment
Brake component foundry goods is heated up with 50 DEG C/min 700 DEG C are heated to, 55-60min is incubated, then it is cold to be carried out quenching with quenching oil But, then the brake component foundry goods after quenching being heated up to be heated at 600 DEG C with 25 DEG C/min again carries out temper, is persistently incubated 50-55 minute；
3. machining；
4. put in storage after checking.
Further, when the copper and molybdenum-iron are poured into a mould with molten iron, first add molybdenum-iron, add copper afterwards.
Further, the ultrasonic Treatment is that frequency 10KHz and 15KHz are alternately processed, at every kind of frequency ultrasonic wave The reason time is 10s, processes the ultrasound wave using frequency for 10KHz for the first time.
Further, the foundry returns addition is the 10% of steel ingot amount, and the foundry returns adopts magnesium iron foundry returns.
Beneficial effect of the present invention：By pouring into a mould copper with molten iron with molybdenum-iron in the present invention, and coordinate and adopt ultrasound wave Process, tensile strength, hardness and impact flexibility is significantly improved, fatigue strength and high-temperature behavior is improved, improves properties, improve Wearability, refines pearlite and graphite, reduces thin section spoken parts in traditional operas, improves big cross section structure sensitive properties, improve thermostability, improve stream Dynamic property, raising casting compactness, improve corrosion resistance, especially solve the delayed fracture under high intensity and fatigue fracture is asked Topic, reliable and stable in use, easy fracture, does not greatly improve safety, can be made by the synergism of a small amount of vanadium and chromium Graphite is refined, and reducing ferrum element increases pearlite, can reduce the martensite transfor mation in tissue, is prevented white macula from occurring, is less prone to Slipping of brake, improves stationarity and the safety of brake.Show, the product tensile strength obtained by the present invention reaches through actual measurement 425-460Mpa, braking surface hardness reaches 240-265HB；Entrucking service life reaches more than 100,000 kilometers, and fatigue test number of times reaches More than 8000 times.
Specific embodiment
Embodiment 1
A kind of automobile brake part casting technique, comprises the following steps：
1. a certain amount of steel scrap is put in middle frequency furnace and molten steel is fused into, treat that the temperature in middle frequency furnace rises to 1000-1080 DEG C when, then put into steel ingot, the pig iron and foundry returns, then deslagging, add ferromanganese and Antaciron after deslagging, treat in middle frequency furnace Temperature is tapped a blast furnace when rising to 1380 DEG C, at this moment, a certain amount of copper and molybdenum-iron is poured into a mould with molten iron, and the 5th minute of cast is opened Begin using ultrasonic Treatment 3 minutes, cast took out brake component foundry goods, the weight hundred of each chemical composition of brake component foundry goods after 15 minutes Divide ratio meet following requirements：Carbon 2.13%, manganese 0.12%, vanadium 0.04%, silicon 0.89%, tungsten 0.01%, nickel 0.42%, chromium 0.20%, copper 0.32%th, molybdenum 0.10%, phosphorus≤0.0022%, sulfur≤0.0033%, balance of ferrum；
2. heat treatment
Brake component foundry goods is heated up with 50 DEG C/min 700 DEG C are heated to, 55-60min is incubated, then it is cold to be carried out quenching with quenching oil But, then the brake component foundry goods after quenching being heated up to be heated at 600 DEG C with 25 DEG C/min again carries out temper, is persistently incubated 50-55 minute；
3. machining；
4. put in storage after checking.
Further, when the copper and molybdenum-iron are poured into a mould with molten iron, first add molybdenum-iron, add copper afterwards.
Further, the ultrasonic Treatment is that frequency 10KHz and 15KHz are alternately processed, at every kind of frequency ultrasonic wave The reason time is 10s, processes the ultrasound wave using frequency for 10KHz for the first time.
Further, the foundry returns addition is the 10% of steel ingot amount, and the foundry returns adopts magnesium iron foundry returns.
Embodiment 2
A kind of automobile brake part casting technique, comprises the following steps：
1. a certain amount of steel scrap is put in middle frequency furnace and molten steel is fused into, treat that the temperature in middle frequency furnace rises to 1000-1080 DEG C when, then put into steel ingot, the pig iron and foundry returns, then deslagging, add ferromanganese and Antaciron after deslagging, treat in middle frequency furnace Temperature is tapped a blast furnace when rising to 1380 DEG C, at this moment, a certain amount of copper and molybdenum-iron is poured into a mould with molten iron, and the 5th minute of cast is opened Begin using ultrasonic Treatment 3 minutes, cast took out brake component foundry goods, the weight hundred of each chemical composition of brake component foundry goods after 15 minutes Divide ratio meet following requirements：Carbon 2.44%, manganese 0.15%, vanadium 0.06%, silicon 1.12%, tungsten 0.03%, nickel 0.45%, chromium 0.30%, copper 0.38%th, molybdenum 0.12%, phosphorus≤0.0022%, sulfur≤0.0033%, balance of ferrum；
2. heat treatment
Brake component foundry goods is heated up with 50 DEG C/min 700 DEG C are heated to, 55-60min is incubated, then it is cold to be carried out quenching with quenching oil But, then the brake component foundry goods after quenching being heated up to be heated at 600 DEG C with 25 DEG C/min again carries out temper, is persistently incubated 50-55 minute；
4. put in storage after checking.
Further, when the copper and molybdenum-iron are poured into a mould with molten iron, first add molybdenum-iron, add copper afterwards.
Further, the ultrasonic Treatment is that frequency 10KHz and 15KHz are alternately processed, at every kind of frequency ultrasonic wave The reason time is 10s, processes the ultrasound wave using frequency for 10KHz for the first time.
Further, the foundry returns addition is the 10% of steel ingot amount, and the foundry returns adopts magnesium iron foundry returns.
Embodiment 3
A kind of automobile brake part casting technique, comprises the following steps：
1. a certain amount of steel scrap is put in middle frequency furnace and molten steel is fused into, treat that the temperature in middle frequency furnace rises to 1000-1080 DEG C when, then put into steel ingot, the pig iron and foundry returns, then deslagging, add ferromanganese and Antaciron after deslagging, treat in middle frequency furnace Temperature is tapped a blast furnace when rising to 1380 DEG C, at this moment, a certain amount of copper and molybdenum-iron is poured into a mould with molten iron, and the 5th minute of cast is opened Begin using ultrasonic Treatment 3 minutes, cast took out brake component foundry goods, the weight hundred of each chemical composition of brake component foundry goods after 15 minutes Divide ratio meet following requirements：Carbon 2.25%, manganese 0.13%, vanadium 0.05%, silicon 1.00%, tungsten 0.02%, nickel 0.44%, chromium 0.25%, copper 0.34%th, molybdenum 0.11%, phosphorus≤0.0022%, sulfur≤0.0033%, balance of ferrum；
2. heat treatment
Brake component foundry goods is heated up with 50 DEG C/min 700 DEG C are heated to, 55-60min is incubated, then it is cold to be carried out quenching with quenching oil But, then the brake component foundry goods after quenching being heated up to be heated at 600 DEG C with 25 DEG C/min again carries out temper, is persistently incubated 50-55 minute；
3. machining；
4. put in storage after checking.
Further, when the copper and molybdenum-iron are poured into a mould with molten iron, first add molybdenum-iron, add copper afterwards.
Further, the ultrasonic Treatment is that frequency 10KHz and 15KHz are alternately processed, at every kind of frequency ultrasonic wave The reason time is 10s, processes the ultrasound wave using frequency for 10KHz for the first time.
Further, the foundry returns addition is the 10% of steel ingot amount, and the foundry returns adopts magnesium iron foundry returns.
Performance：
Table 1
Tensile strength MPa Yield strength MPa Braking surface hardness reaches HB Entrucking service life/kilometer Fatigue test number of times
Embodiment 1 425 310 240 100000 8000
Embodiment 2 450 335 255 11000 8300
Embodiment 3 460 345 265 120000 8600
Comparative example 1 340 250 220 90000 7000
Comparative example 2 400 300 220 95000 7500
Wherein, comparative example 1 is：By 3 step of embodiment, 1. middle ultrasonic Treatment is omitted, only by a certain amount of copper and molybdenum-iron with molten iron one Rise and poured into a mould, cast took out brake component foundry goods after 15 minutes；Other process steps are constant；
Comparative example 2 is：By embodiment 3 step 1. in a certain amount of copper and molybdenum-iron are poured into a mould with molten iron, first add copper Add molybdenum-iron afterwards；Remaining process step is constant.
As can be seen from Table 1, the brake component superior performance that prepared by the present invention, when Sonication assisted treatment is not adopted, respectively Performance is all remarkably decreased, and changes the order of addition of copper and molybdenum-iron, and brake component performance also has and to a certain degree declines.

Claims (4)

1. a kind of automobile brake part casting technique, it is characterised in that comprise the following steps：
1. a certain amount of steel scrap is put in middle frequency furnace and molten steel is fused into, treat that the temperature in middle frequency furnace rises to 1000-1080 DEG C When, then steel ingot, the pig iron and foundry returns is put into, then deslagging, adds ferromanganese and Antaciron after deslagging, treats the temperature in middle frequency furnace Degree is tapped a blast furnace when rising to 1380 DEG C, at this moment, a certain amount of copper and molybdenum-iron is poured into a mould with molten iron, and the 5th minute of cast starts Using ultrasonic Treatment 3 minutes, cast took out brake component foundry goods, the weight percent of each chemical composition of brake component foundry goods after 15 minutes Than following requirements should be met：Carbon 2.13-2.44%, manganese 0.12-0.15%, vanadium 0.04-0.06%, silicon 0.89-1.12%, tungsten 0.01- 0.03%th, nickel 0.42-0.45%, chromium 0.20-0.30%, copper 0.32-0.38%, molybdenum 0.10-0.12%, phosphorus≤0.0022%, sulfur≤ 0.0033%, balance of ferrum；
2. heat treatment
Brake component foundry goods is heated up with 50 DEG C/min 700 DEG C are heated to, 55-60min is incubated, then it is cold to be carried out quenching with quenching oil But, then the brake component foundry goods after quenching being heated up to be heated at 600 DEG C with 25 DEG C/min again carries out temper, is persistently incubated 50-55 minute；
3. machining；
4. put in storage after checking.
2. a kind of automobile brake part casting technique according to claim 1, it is characterised in that the copper and molybdenum-iron are with molten iron When being poured into a mould together, first add molybdenum-iron, add copper afterwards.
3. a kind of automobile brake part casting technique according to claim 1, it is characterised in that the ultrasonic Treatment is frequency Rate 10KHz and 15KHz are alternately processed, and every kind of frequency ultrasonic wave process time is to process 10s, first time to be using frequency The ultrasound wave of 10KHz.
4. a kind of automobile brake part casting technique according to claim 1, it is characterised in that the foundry returns addition is The 10% of steel ingot amount, the foundry returns adopts magnesium iron foundry returns.
CN201610936677.5A 2016-10-24 2016-10-24 Automobile brake foundry technology Pending CN106435347A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN201610936677.5A CN106435347A (en) 2016-10-24 2016-10-24 Automobile brake foundry technology

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107974527A (en) * 2017-11-28 2018-05-01 江苏迪迈机械有限公司 A kind of gear reducer turbine casting technique
CN109175257A (en) * 2018-09-06 2019-01-11 宁夏众信机械设备制造有限公司 A kind of melting casting process of caliper
CN114850404A (en) * 2022-05-24 2022-08-05 常州工学院 High-speed rail transit braking part casting mold structure and manufacturing process thereof

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CN101597715A (en) * 2009-07-03 2009-12-09 郑州神牛铸造有限公司 Iron-based high-temperature alloy material for guide roller and preparation method thereof
CN102205416A (en) * 2011-05-19 2011-10-05 东睦新材料集团股份有限公司 Manufacture method of engine tappet
CN102936681A (en) * 2012-11-19 2013-02-20 湖州市银鑫轧辊有限公司 Method for manufacturing rollers by using high-speed steel
CN103572147A (en) * 2012-08-07 2014-02-12 洪泽县汽车半轴制造有限公司 Half-shaft of cast steel tractor
CN103710613A (en) * 2013-09-25 2014-04-09 宁国市正兴耐磨材料有限公司 High chromium alloy wear-resistance steel ball
CN103725974A (en) * 2013-12-30 2014-04-16 南阳汉冶特钢有限公司 Novel low-cost wear-resistant pipe steel X65 steel plate and production method thereof
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CN104032227A (en) * 2014-06-04 2014-09-10 龙岩盛丰机械制造有限公司 A low-carbon alloy cast steel axle housing and a manufacturing method thereof
CN104120350A (en) * 2014-07-04 2014-10-29 四川易亨机械制造有限公司 High-performance alloy steel and manufacturing method thereof
CN104148399A (en) * 2014-06-16 2014-11-19 枣庄瑞兴机械制造有限公司 Wear-resisting roll used for steel rolling intermediate mill frame and manufacturing method thereof
CN105018834A (en) * 2015-08-07 2015-11-04 东北大学 Alloy Bainite ductile cast iron roller surface of high-pressure roller mill and preparation method of alloy Bainite ductile cast iron roller surface
CN105039836A (en) * 2015-06-03 2015-11-11 东北大学 High-pressure roller mill cast-in roller surface and preparation method thereof
CN105274420A (en) * 2014-07-16 2016-01-27 匡永刚 Casting technology
CN105506444A (en) * 2015-12-11 2016-04-20 宁国市永泰实业有限公司 Metal block for casting automotive suspension
CN105543638A (en) * 2015-12-11 2016-05-04 宁国市永泰实业有限公司 Metal block for casting automotive engine shell
CN105671418A (en) * 2016-03-29 2016-06-15 宁国市开源电力耐磨材料有限公司 Novel preparation method for high-chromium cast iron
CN105821294A (en) * 2016-03-29 2016-08-03 中原内配集团股份有限公司 High-damping and high-performance alloy cylinder sleeve and preparation technology thereof

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Publication number Priority date Publication date Assignee Title
JPH02166226A (en) * 1988-12-20 1990-06-26 Mazda Motor Corp Manufacture of wear-resistant cast iron parts
CN101597715A (en) * 2009-07-03 2009-12-09 郑州神牛铸造有限公司 Iron-based high-temperature alloy material for guide roller and preparation method thereof
CN102205416A (en) * 2011-05-19 2011-10-05 东睦新材料集团股份有限公司 Manufacture method of engine tappet
CN103572147A (en) * 2012-08-07 2014-02-12 洪泽县汽车半轴制造有限公司 Half-shaft of cast steel tractor
CN102936681A (en) * 2012-11-19 2013-02-20 湖州市银鑫轧辊有限公司 Method for manufacturing rollers by using high-speed steel
CN103849737A (en) * 2012-11-28 2014-06-11 大连乾宝铸铁有限公司 Heat treatment method of spheroidal graphite cast iron
CN103710613A (en) * 2013-09-25 2014-04-09 宁国市正兴耐磨材料有限公司 High chromium alloy wear-resistance steel ball
CN103725974A (en) * 2013-12-30 2014-04-16 南阳汉冶特钢有限公司 Novel low-cost wear-resistant pipe steel X65 steel plate and production method thereof
CN104032227A (en) * 2014-06-04 2014-09-10 龙岩盛丰机械制造有限公司 A low-carbon alloy cast steel axle housing and a manufacturing method thereof
CN104148399A (en) * 2014-06-16 2014-11-19 枣庄瑞兴机械制造有限公司 Wear-resisting roll used for steel rolling intermediate mill frame and manufacturing method thereof
CN104120350A (en) * 2014-07-04 2014-10-29 四川易亨机械制造有限公司 High-performance alloy steel and manufacturing method thereof
CN105274420A (en) * 2014-07-16 2016-01-27 匡永刚 Casting technology
CN105039836A (en) * 2015-06-03 2015-11-11 东北大学 High-pressure roller mill cast-in roller surface and preparation method thereof
CN105018834A (en) * 2015-08-07 2015-11-04 东北大学 Alloy Bainite ductile cast iron roller surface of high-pressure roller mill and preparation method of alloy Bainite ductile cast iron roller surface
CN105506444A (en) * 2015-12-11 2016-04-20 宁国市永泰实业有限公司 Metal block for casting automotive suspension
CN105543638A (en) * 2015-12-11 2016-05-04 宁国市永泰实业有限公司 Metal block for casting automotive engine shell
CN105671418A (en) * 2016-03-29 2016-06-15 宁国市开源电力耐磨材料有限公司 Novel preparation method for high-chromium cast iron
CN105821294A (en) * 2016-03-29 2016-08-03 中原内配集团股份有限公司 High-damping and high-performance alloy cylinder sleeve and preparation technology thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107974527A (en) * 2017-11-28 2018-05-01 江苏迪迈机械有限公司 A kind of gear reducer turbine casting technique
CN109175257A (en) * 2018-09-06 2019-01-11 宁夏众信机械设备制造有限公司 A kind of melting casting process of caliper
CN114850404A (en) * 2022-05-24 2022-08-05 常州工学院 High-speed rail transit braking part casting mold structure and manufacturing process thereof

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