CN104084770A - Casting and rolling combined process for 42CrMo bearing ring workblanks - Google Patents
Casting and rolling combined process for 42CrMo bearing ring workblanks Download PDFInfo
- Publication number
- CN104084770A CN104084770A CN201410303996.3A CN201410303996A CN104084770A CN 104084770 A CN104084770 A CN 104084770A CN 201410303996 A CN201410303996 A CN 201410303996A CN 104084770 A CN104084770 A CN 104084770A
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- casting
- rolling
- rolled
- 42crmo
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/003—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass bearings
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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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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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)
- Heat Treatment Of Articles (AREA)
- Rolling Contact Bearings (AREA)
Abstract
The invention discloses a casting and rolling combined process for 42CrMo bearing ring workblanks. The casting and rolling combined process for 42CrMo bearing ring workblanks is characterized by including the steps of smelting, casting, heating of ring castings, ring rolling, normalizing, lathing and quenching and tempering. To produce super-large 42CrMo bearing ring workblanks through the casting and rolling combined process is completely feasible. The production steps such as forging, cake upsetting, chambering and secondary heating are omitted in the novel casting and rolling combined process, so that the production cost is largely lowered.
Description
Technical field
The present invention relates to bearing and manufacture field, is especially that combination process is rolled in a kind of casting of 42CrMo bearing ferrule blanks.
Background technology
At present, bearing industry adopts the blank of 42CrMo steel annular forging as super large type bearing ring more, and the processing process of bearer ring shape Forging is: steel-making → ingot casting → excision ingot casting cap mouth and afterbody → ingot casting heating → forging → upsetting cake → reaming → post bake → rolling.The manufacturing procedure of forging blank is many, and cost is high.
Summary of the invention
For reducing the manufacturing procedure of blank, reduce production costs, combination process is rolled in the casting that the present invention proposes a kind of 42CrMo bearing ferrule blanks, adopt conventional smelting and pouring technology to pour into annular cast, again annular cast rolling is processed into the blank of bearing ring, then it is carried out to normalizing and modifier treatment, make its acquisition can meet the mechanical property of technical requirement.
The technical scheme that the present invention solves its technical problem employing is: the heating → rolling → normalizing → Vehicle Processing → modifier treatment of smelt → casting → casting ring.
Described smelting adopts electric arc furnaces smelting, reinforced coefficient: 1.184, and alloying element proportioning: Mo 5 kg/t, Cr 18 kg/t, Si 5. 5 kg/t, Mn 12 kg/t, A11.2～1.5 kg/t, smelting temperature: 1680～1 700 DEG C, the duration of heat: 3.5～4 h.
Described casting technique is as follows: (1) sand formulation: waterglass 7%～9%, and bentonite 1%～1. 5%, all the other are quartz sand;
(2) molding sand mixing technique: by the mixed system of puddle mixer, dry quartz sand adds after bentonite, is dry mixed 8～10 min, then adds waterglass, mixes 10～15 min, goes out sand molding;
(3) moulding: should be immediately by technological requirement moulding, in order to avoid molding sand sclerosis after molding sand mixes;
(4) pouring temperature: 1550～1560 DEG C;
(5) poring rate: 65～70 kg/s;
(6) duration of pouring: 12 ~ 18s;
(7) temperature retention time: foundry goods band sand mold is incubated 22 h;
(8) when being cooled to 400～500 DEG C, ring cuts dead head wait casting.
Described rolling technique is: casting ring is heated to 1150 DEG C, and firing rate is 150 DEG C/h, after temperature retention time 4～5 h, carries out rolling, and ring rolling machine axial rolling power is 0～200 t, and radial rolling power is 0～250 t.
Described normalizing process is: be warming up to 645 ~ 655 DEG C with the firing rate of 30～70 DEG C/h, and insulation 1 h, then be warming up to 860～880 DEG C with the speed of 50～100 DEG C/h, after insulation 8～9 h, come out of the stove air-cooled.
The process route of described modifier treatment is: be warming up to 645 ~ 655 DEG C with the firing rate of 30～70 DEG C/h, and insulation 1 h, then be warming up to 635 ~ 645 DEG C with the speed of 50～100 DEG C/h, the quenching of coming out of the stove after insulation 2.5 h; After quenching, carry out tempering in 2 h, workpiece is warming up to 575 ~ 585 DEG C with the firing rate of 30～70 DEG C/h in tempering furnace, the insulation 6 h air cooling of coming out of the stove.
The invention has the beneficial effects as follows that it is feasible adopting casting to roll over combination process production 42CrMo super large type bearing ring blank, casting is rolled over compound new technology and has been reduced the production processes such as forging, upsetting cake, reaming, post bake, and production cost is significantly reduced.
Brief description of the drawings
Fig. 1 normalizing process curve;
Fig. 2 hardening and tempering process curve.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further illustrated, and the processing process that adopts casting to roll over combination process production super large type bearing ring blank is: the heating → rolling → normalizing → Vehicle Processing → modifier treatment of smelt → casting → casting ring.
1.1 smelt
(1) smelting process: electric arc furnace smelting;
(2) reinforced coefficient: 1.184 (foundry goods per ton need to add the ratio of scrap iron material, not containing alloying element amount);
(3) alloying element proportioning: Mo 5 kg/t, Cr 18 kg/t, Si 5.5 kg/t, Mn 12 kg/t, Al 1.2～1.5 kg/t;
(4) smelting temperature: 1 680～1 700 DEG C;
(5) duration of heat: 3.5～4 h;
(6) furnace charge carries out both analysis after fully melting, and measures and adjust the chemical composition of molten steel, and the chemical composition of molten steel should meet the requirement of table 1;
(7) molten steel chemical composition adjust qualified after, the molten steel in smelting furnace is poured in ladle.
(8) slag swimming in above ladle is removed, then adopted Portable Multifunctional Temperature Measurer to measure liquid steel temperature, molten steel temperature is left standstill to 1550～1560 DEG C, before the molten steel casting of smelting, the calm time is not less than 3 min.
1.2 casting
(1) sand formulation: waterglass 7%～9%, bentonite 1%～1.5%, all the other are quartz sand;
(2) molding sand mixing technique: by the mixed system of puddle mixer, dry quartz sand adds after bentonite, is dry mixed 8～10min, then adds waterglass, mixes 10～15 min, goes out sand molding;
(3) moulding: should be immediately by technological requirement moulding, in order to avoid molding sand sclerosis after molding sand mixes;
(4) pouring temperature: 1550～1 560 DEG C;
(5) poring rate: 65～70 kg/s;
(6) duration of pouring: approximately 15 s (determining according to foundry goods size);
(7) temperature retention time: foundry goods band sand mold is incubated 22 h;
(8) when being cooled to 400～500 DEG C, ring cuts dead head wait casting.
1.3 rolling
Casting ring is heated to 1150 DEG C, and firing rate is 150 DEG C/h, carries out rolling, Ring Rolling Machine axle after temperature retention time 4～5 h
Be 0～200 t to roll-force, radial rolling power is 0～250 t.
1.4 normalizing
For the tissue of refinement rolling part, tackle it and carry out normalized treatment, normalizing process is: be warming up to 645 ~ 655 DEG C with the firing rate of 30～70 DEG C/h, be incubated 1 h, be warming up to 860～880 DEG C with the speed of 50～100 DEG C/h again, after insulation 8～9 h, come out of the stove air-cooled, process curve is as shown in Fig. 1.
1. 5 is modified
In order to ensure the mechanical property of extra large size bearing, rolling part is carried out to modifier treatment, the process route of modifier treatment is: be warming up to 645 ~ 655 DEG C with the firing rate of 30～70 DEG C/h, be incubated 1 h, be warming up to 835 ~ 845 DEG C with the speed of 50～100 DEG C/h again, the quenching of coming out of the stove after insulation 2.5 h.Quench in 2 h. carry out tempering, workpiece is warming up to 575 ~ 585 DEG C with the firing rate of 30～70 DEG C/h in tempering furnace, the insulation 6 h air cooling of coming out of the stove.Process curve is as shown in Fig. 2.
Claims (6)
1. a combination process is rolled in the casting of 42CrMo bearing ferrule blanks, it is characterized in that technological process is the heating → rolling → normalizing → Vehicle Processing → modifier treatment of smelt → casting → casting ring.
2. combination process is rolled in the casting of a kind of 42CrMo bearing ferrule blanks according to claim 1, it is characterized in that smelting the smelting of employing electric arc furnaces, reinforced coefficient: 1.184, alloying element proportioning: Mo 5 kg/t, Cr 18 kg/t, Si 5. 5 kg/t, Mn 12 kg/t, A11.2～1.5 kg/t, smelting temperature: 1680～1 700 DEG C, the duration of heat: 3.5～4 h.
3. combination process is rolled in the casting of a kind of 42CrMo bearing ferrule blanks according to claim 1, it is characterized in that casting technique is as follows: (1) sand formulation: waterglass 7%～9%, and bentonite 1%～1. 5%, all the other are quartz sand;
(2) molding sand mixing technique: by the mixed system of puddle mixer, dry quartz sand adds after bentonite, is dry mixed 8～10 min, then adds waterglass, mixes 10～15 min, goes out sand molding;
(3) moulding: should be immediately by technological requirement moulding, in order to avoid molding sand sclerosis after molding sand mixes;
(4) pouring temperature: 1550～1560 DEG C;
(5) poring rate: 65～70 kg/s;
(6) duration of pouring: 12 ~ 18s;
(7) temperature retention time: foundry goods band sand mold is incubated 22 h;
(8) when being cooled to 400～500 DEG C, ring cuts dead head wait casting.
4. combination process is rolled in the casting of a kind of 42CrMo bearing ferrule blanks according to claim 1, it is characterized in that rolling technique is: casting ring is heated to 1150 DEG C, firing rate is 150 DEG C/h, after temperature retention time 4～5 h, carry out rolling, ring rolling machine axial rolling power is 0～200 t, and radial rolling power is 0～250 t.
5. combination process is rolled in the casting of a kind of 42CrMo bearing ferrule blanks according to claim 1, it is characterized in that normalizing process is: be warming up to 645 ~ 655 DEG C with the firing rate of 30～70 DEG C/h, be incubated 1 h, be warming up to 860～880 DEG C with the speed of 50～100 DEG C/h again, after insulation 8～9 h, come out of the stove air-cooled.
6. combination process is rolled in the casting of a kind of 42CrMo bearing ferrule blanks according to claim 1, the process route that it is characterized in that modifier treatment is: be warming up to 645 ~ 655 DEG C with the firing rate of 30～70 DEG C/h, be incubated 1 h, be warming up to 635 ~ 645 DEG C with the speed of 50～100 DEG C/h again, the quenching of coming out of the stove after insulation 2.5 h; After quenching, carry out tempering in 2 h, workpiece is warming up to 575 ~ 585 DEG C with the firing rate of 30～70 DEG C/h in tempering furnace, the insulation 6 h air cooling of coming out of the stove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410303996.3A CN104084770A (en) | 2014-06-30 | 2014-06-30 | Casting and rolling combined process for 42CrMo bearing ring workblanks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410303996.3A CN104084770A (en) | 2014-06-30 | 2014-06-30 | Casting and rolling combined process for 42CrMo bearing ring workblanks |
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| Publication Number | Publication Date |
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| CN104084770A true CN104084770A (en) | 2014-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410303996.3A Pending CN104084770A (en) | 2014-06-30 | 2014-06-30 | Casting and rolling combined process for 42CrMo bearing ring workblanks |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104372250A (en) * | 2014-11-07 | 2015-02-25 | 江苏天舜金属材料集团有限公司 | Bearing ring blank and casting-rolling composite process thereof |
| CN104400350A (en) * | 2014-11-06 | 2015-03-11 | 无锡市百顺机械厂 | Manufacturing method of bearing seat |
| CN104439940A (en) * | 2014-11-08 | 2015-03-25 | 江苏天舜金属材料集团有限公司 | Clamp nut casting technology based on casting and rolling combined forming |
| CN106002096A (en) * | 2016-06-08 | 2016-10-12 | 中航工业哈尔滨轴承有限公司 | One-time fire forging method for M50 steel bearing ring forge piece |
| CN107984173A (en) * | 2017-12-05 | 2018-05-04 | 徐州博丰轴承有限公司 | A kind of processing method of bearing ring |
| CN110695279A (en) * | 2019-09-20 | 2020-01-17 | 张家港中环海陆高端装备股份有限公司 | Method for avoiding folding and skin-clamping and harmful tissue during ring forging |
-
2014
- 2014-06-30 CN CN201410303996.3A patent/CN104084770A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104400350A (en) * | 2014-11-06 | 2015-03-11 | 无锡市百顺机械厂 | Manufacturing method of bearing seat |
| CN104372250A (en) * | 2014-11-07 | 2015-02-25 | 江苏天舜金属材料集团有限公司 | Bearing ring blank and casting-rolling composite process thereof |
| CN104439940A (en) * | 2014-11-08 | 2015-03-25 | 江苏天舜金属材料集团有限公司 | Clamp nut casting technology based on casting and rolling combined forming |
| CN104439940B (en) * | 2014-11-08 | 2017-02-22 | 佛山市品固金属制品有限公司 | Clamp nut casting technology based on casting and rolling combined forming |
| CN106002096A (en) * | 2016-06-08 | 2016-10-12 | 中航工业哈尔滨轴承有限公司 | One-time fire forging method for M50 steel bearing ring forge piece |
| CN106002096B (en) * | 2016-06-08 | 2018-07-31 | 中航工业哈尔滨轴承有限公司 | A kind of M50 steel bearings lasso forging single fire forging method |
| CN107984173A (en) * | 2017-12-05 | 2018-05-04 | 徐州博丰轴承有限公司 | A kind of processing method of bearing ring |
| CN110695279A (en) * | 2019-09-20 | 2020-01-17 | 张家港中环海陆高端装备股份有限公司 | Method for avoiding folding and skin-clamping and harmful tissue during ring forging |
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| PB01 | Publication | ||
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Application publication date: 20141008 |