CN104195308A - Alloy steel bearing block machining method beneficial to reduction of heat treatment induced cracks - Google Patents
Alloy steel bearing block machining method beneficial to reduction of heat treatment induced cracks Download PDFInfo
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- CN104195308A CN104195308A CN201410402760.5A CN201410402760A CN104195308A CN 104195308 A CN104195308 A CN 104195308A CN 201410402760 A CN201410402760 A CN 201410402760A CN 104195308 A CN104195308 A CN 104195308A
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000010438 heat treatment Methods 0.000 title claims abstract description 33
- 229910000851 Alloy steel Inorganic materials 0.000 title claims abstract description 17
- 230000009286 beneficial effect Effects 0.000 title claims abstract description 14
- 238000003754 machining Methods 0.000 title abstract 7
- 238000001816 cooling Methods 0.000 claims abstract description 37
- 238000010791 quenching Methods 0.000 claims abstract description 32
- 230000000171 quenching effect Effects 0.000 claims abstract description 32
- 238000005496 tempering Methods 0.000 claims abstract description 18
- 238000005266 casting Methods 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 238000005242 forging Methods 0.000 claims description 9
- 238000009413 insulation Methods 0.000 claims description 9
- 230000035939 shock Effects 0.000 description 5
- 230000008646 thermal stress Effects 0.000 description 5
- 239000013078 crystal Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000008642 heat stress Effects 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- 238000007669 thermal treatment Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003245 working effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001603 reducing effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses an alloy steel bearing block machining method beneficial to the reduction of heat treatment induced cracks and used for manufacturing alloy steel bearing blocks containing Cr, Ni and Mo elements. The machining method comprises the following steps of casting, heat treatment, reference plane machining, hole machining and connecting bolt hole making which are sequentially carried out, wherein the heat treatment process comprises the steps of quenching and tempering, a way of heating in stages is adopted in the quenching process, and the cooling step in the quenching process is realized in a way of air cooling after furnace cooling. The machining method is simple in process route and beneficial to quality improvement of the alloy steel bearing block and increment of machining efficiency.
Description
Technical field
The present invention relates to mechanical workout manufacturing process field, particularly relate to a kind of steel alloy bearing support working method that reduces heat treatment crack that is beneficial to.
Background technology
Prior art bottom bracket is widely used in rotating machinery, as the bracing member of bearing.On bearing support, be provided with concentric circle holes, described concentric circle holes is the installation station of bearing.In prior art, requiring that rotating accuracy is high, in heavy duty or the higher rotating machinery of rotating speed, two even more bearings often need to be installed in same bearing support and think that rotating shaft provides the point of suppon of two or more, the spiral pump plumer block of growing as transmission shaft, blower fan main shaft plumer block, the running roller plumer block of plate bending rolls etc. of large-scale water cooling tower.
Center hole on prior art bottom bracket is generally made up of the circular hole of two sections of reducings and axis conllinear, the transition section of two sections of circular holes is as the shaft shoulder of bearing, install to simplify the structure of bearing support and to be convenient to bearing, two sections of circular holes in the time that diameter is larger due to the restriction of regular turning tool, the forms that adopt boring machine bore hole process more, but easy to wear at cutting process for the cutter of bore hole, boring cutter processing length is that the hole abrasion loss of 100mm may reach 0.1mm, have a strong impact on the center hole that obtains and the interference fit precision of bearing, be unfavorable for the work-ing life of the parts such as rotating machinery bearing, the shock resistance mechanics performance of prior art bottom bracket awaits further raising simultaneously.
Summary of the invention
Cutter for bore hole in above-mentioned prior art is easy to wear in cutting process, boring cutter processing length is that the hole abrasion loss of 100mm may reach 0.1mm, have a strong impact on the center hole that obtains and the interference fit precision of bearing, be unfavorable for the work-ing life of the parts such as rotating machinery bearing, the shock resistance mechanics performance of prior art bottom bracket awaits the problem further improving simultaneously, the invention provides a kind of steel alloy bearing support working method that reduces heat treatment crack that is beneficial to.
For the problems referred to above, the steel alloy bearing support working method that reduces heat treatment crack that is beneficial to provided by the invention reaches goal of the invention by following technical essential: be beneficial to the steel alloy bearing support working method that reduces heat treatment crack, be used for the manufacture of the steel alloy bearing support that contains Cr, Ni and Mo element, described working method comprises following steps in sequence: casting, processing datum, hole processing, making joint bolt hole, be also provided with heat treatment step between described casting and processing datum step;
Described heat treatment step comprises and quenching and tempering, and described quenching is that forging that forging is obtained is heated to 975-1050 DEG C and insulation and is no less than after 6h coolingly, and to be blank heating that quenching is obtained be no less than oil cooling after 8h to 580-630 DEG C and insulation in described tempering;
In described quenching process, blank is intensification stage by stage in the intensification that reaches blank before 975-1050 DEG C, the holding stage that one section of duration is no less than 1h is at least set in temperature-rise period, and after being cooled to first stove and being chilled to 800-850 DEG C of quenching, oil cooling is to air cooling after 180-200 DEG C;
Oil cooling in described tempering is air cooling after blank is cooled to 200-250 DEG C.
The heat treatment step arranging is used for eliminating or weakens the defects such as the crystal structure being brought to blank by forging step is thick, component segregation, and after thermal treatment completes, makes blank have suitable hardness to be suitable for follow-up mechanical workout.In above-mentioned heat treatment step, the selection of Heating temperature, soaking time and the type of cooling to quenching, tempering, can make heat treated blank under the fine and closely woven prerequisite of metallographic structure, in blank metallographic structure, there is the strip martensite of a large amount of excellent propertys, be conducive to the obdurability of blank, the product that above technique is obtained has good shock resistance.
In the quenching process arranging, heat up stage by stage and cooling stage by stage, oil cooling adopts the form of air cooling to a certain extent afterwards in drawing process, all for preventing that blank thermal stresses from sharply increasing, the restriction that particularly the cold temperature of stove rolls off the production line in quenching process, is conducive to obtain best cooling heat stress remnants in the situation that ensureing quenching quality.
Further technical scheme is:
For the benefit of quenching efficiency, divides equally the thermal stresses accumulative speed in temperature-rise period, and described holding stage is one, and the holding temperature of holding stage is 550-600 DEG C.
For further optimizing tempering effect, while blank being cooled to 200-250 DEG C in described tempering oil cooling, insulation is no less than 8h.
For ease of mechanical workout, between described casting and processing datum, processing datum and hole processing, hole processing and making joint bolt hole, be provided with scribe step.
The present invention has following beneficial effect:
1, the heat treatment step arranging is used for eliminating or weakens the defects such as the crystal structure being brought to blank by forging step is thick, component segregation, and after thermal treatment completes, makes blank have suitable hardness to be suitable for follow-up mechanical workout.In above-mentioned heat treatment step, the selection of Heating temperature, soaking time and the type of cooling to quenching, tempering, can make heat treated blank under the fine and closely woven prerequisite of metallographic structure, in blank metallographic structure, there is the strip martensite of a large amount of excellent propertys, be conducive to the obdurability of blank, the product that above technique is obtained has good shock resistance.
2, in the quenching process arranging, heat up stage by stage and cooling stage by stage, oil cooling adopts the form of air cooling to a certain extent afterwards in drawing process, all for preventing that blank thermal stresses from sharply increasing, the restriction that particularly the cold temperature of stove rolls off the production line in quenching process, is conducive to obtain best cooling heat stress remnants in the situation that ensureing quenching quality.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but structure of the present invention is not limited only to following examples.
Embodiment 1:
Be beneficial to the steel alloy bearing support working method that reduces heat treatment crack, be used for the manufacture of the steel alloy bearing support that contains Cr, Ni and Mo element, described working method comprises following steps in sequence: casting, processing datum, hole processing, making joint bolt hole, be also provided with heat treatment step between described casting and processing datum step;
Described heat treatment step comprises and quenching and tempering, and described quenching is that forging that forging is obtained is heated to 975-1050 DEG C and insulation and is no less than after 6h coolingly, and to be blank heating that quenching is obtained be no less than oil cooling after 8h to 580-630 DEG C and insulation in described tempering;
In described quenching process, blank is intensification stage by stage in the intensification that reaches blank before 975-1050 DEG C, the holding stage that one section of duration is no less than 1h is at least set in temperature-rise period, and after being cooled to first stove and being chilled to 800-850 DEG C of quenching, oil cooling is to air cooling after 180-200 DEG C;
Oil cooling in described tempering is air cooling after blank is cooled to 200-250 DEG C.
In this operational path, the heat treatment step of setting is used for eliminating or weakens the defects such as the crystal structure being brought to blank by forging step is thick, component segregation, and after thermal treatment completes, makes blank have suitable hardness to be suitable for follow-up mechanical workout.In above-mentioned heat treatment step, the selection of Heating temperature, soaking time and the type of cooling to quenching, tempering, can make heat treated blank under the fine and closely woven prerequisite of metallographic structure, in blank metallographic structure, there is the strip martensite of a large amount of excellent propertys, be conducive to the obdurability of blank, the product that above technique is obtained has good shock resistance.
In the quenching process arranging, heat up stage by stage and cooling stage by stage, oil cooling adopts the form of air cooling to a certain extent afterwards in drawing process, all for preventing that blank thermal stresses from sharply increasing, the restriction that particularly the cold temperature of stove rolls off the production line in quenching process, is conducive to obtain best cooling heat stress remnants in the situation that ensureing quenching quality.
Embodiment 2:
The present embodiment is further qualified on the basis of embodiment 1: for the benefit of quenching efficiency, divide equally the thermal stresses accumulative speed in temperature-rise period, and described holding stage is one, the holding temperature of holding stage is 550-600 DEG C.
For further optimizing tempering effect, while blank being cooled to 200-250 DEG C in described tempering oil cooling, insulation is no less than 8h.
For ease of mechanical workout, between described casting and processing datum, processing datum and hole processing, hole processing and making joint bolt hole, be provided with scribe step.
Above content is the further description of the present invention being done in conjunction with concrete preferred implementation, can not assert that the specific embodiment of the present invention is confined to these explanations.For general technical staff of the technical field of the invention, not departing from other embodiments that draw under technical scheme of the present invention, all should be included in protection scope of the present invention.
Claims (4)
1. be beneficial to the steel alloy bearing support working method that reduces heat treatment crack, be used for the manufacture of the steel alloy bearing support that contains Cr, Ni and Mo element, described working method comprises following steps in sequence: casting, processing datum, hole processing, making joint bolt hole, it is characterized in that, between described casting and processing datum step, be also provided with heat treatment step;
Described heat treatment step comprises and quenching and tempering, and described quenching is that forging that forging is obtained is heated to 975-1050 DEG C and insulation and is no less than after 6h coolingly, and to be blank heating that quenching is obtained be no less than oil cooling after 8h to 580-630 DEG C and insulation in described tempering;
In described quenching process, blank is intensification stage by stage in the intensification that reaches blank before 975-1050 DEG C, the holding stage that one section of duration is no less than 1h is at least set in temperature-rise period, and after being cooled to first stove and being chilled to 800-850 DEG C of quenching, oil cooling is to air cooling after 180-200 DEG C;
Oil cooling in described tempering is air cooling after blank is cooled to 200-250 DEG C.
2. the steel alloy bearing support working method that reduces heat treatment crack that is beneficial to according to claim 1, is characterized in that, described holding stage is one, and the holding temperature of holding stage is 550-600 DEG C.
3. the steel alloy bearing support working method that reduces heat treatment crack that is beneficial to according to claim 1, is characterized in that, while blank being cooled to 200-250 DEG C in described tempering oil cooling, insulation is no less than 8h.
4. according to being beneficial to the steel alloy bearing support working method that reduces heat treatment crack described in any one in claim 1 to 4, it is characterized in that, between described casting and processing datum, processing datum and hole processing, hole processing and making joint bolt hole, be provided with scribe step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410402760.5A CN104195308A (en) | 2014-08-17 | 2014-08-17 | Alloy steel bearing block machining method beneficial to reduction of heat treatment induced cracks |
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| CN201410402760.5A CN104195308A (en) | 2014-08-17 | 2014-08-17 | Alloy steel bearing block machining method beneficial to reduction of heat treatment induced cracks |
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| CN104195308A true CN104195308A (en) | 2014-12-10 |
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| CN201410402760.5A Pending CN104195308A (en) | 2014-08-17 | 2014-08-17 | Alloy steel bearing block machining method beneficial to reduction of heat treatment induced cracks |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107881297A (en) * | 2017-12-05 | 2018-04-06 | 徐州博丰轴承有限公司 | A kind of processing method of bearing block |
| CN112247485A (en) * | 2020-10-12 | 2021-01-22 | 杭州富阳日欣精密机械制造有限公司 | Precision machining method for high-precision bearing seat type parts |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10219402A (en) * | 1997-01-31 | 1998-08-18 | Nippon Seiko Kk | Rolling support device |
| CN101576123A (en) * | 2008-05-09 | 2009-11-11 | 嵊州市美亚特种轴承厂 | Process for manufacturing bearing ring |
| JP5147259B2 (en) * | 2007-02-23 | 2013-02-20 | Ｎｔｎ株式会社 | Manufacturing method of wheel bearing device |
| CN103643023A (en) * | 2013-11-26 | 2014-03-19 | 洛阳Lyc轴承有限公司 | Method for carrying out carburizing and quenching by changing procedure of bearing ring processing |
-
2014
- 2014-08-17 CN CN201410402760.5A patent/CN104195308A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10219402A (en) * | 1997-01-31 | 1998-08-18 | Nippon Seiko Kk | Rolling support device |
| JP5147259B2 (en) * | 2007-02-23 | 2013-02-20 | Ｎｔｎ株式会社 | Manufacturing method of wheel bearing device |
| CN101576123A (en) * | 2008-05-09 | 2009-11-11 | 嵊州市美亚特种轴承厂 | Process for manufacturing bearing ring |
| CN103643023A (en) * | 2013-11-26 | 2014-03-19 | 洛阳Lyc轴承有限公司 | Method for carrying out carburizing and quenching by changing procedure of bearing ring processing |
Non-Patent Citations (2)
| Title |
|---|
| 全国职业培训教学工作指导委员会煤炭专业委员会: "《煤矿机械检修工艺学》", 31 March 2009, 煤炭工业出版社 * |
| 肖钏方 等: "热轧精轧机轴承座热处理工艺的研究", 《武汉交通科技大学学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107881297A (en) * | 2017-12-05 | 2018-04-06 | 徐州博丰轴承有限公司 | A kind of processing method of bearing block |
| CN112247485A (en) * | 2020-10-12 | 2021-01-22 | 杭州富阳日欣精密机械制造有限公司 | Precision machining method for high-precision bearing seat type parts |
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Application publication date: 20141210 |