CN104148901A - Bearing base production process capable of well reducing heat treatment defects - Google Patents
Bearing base production process capable of well reducing heat treatment defects Download PDFInfo
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- CN104148901A CN104148901A CN201410402741.2A CN201410402741A CN104148901A CN 104148901 A CN104148901 A CN 104148901A CN 201410402741 A CN201410402741 A CN 201410402741A CN 104148901 A CN104148901 A CN 104148901A
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- hole
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- quenching
- blank
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- 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
-
- 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
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a bearing base production process capable of well reducing heat treatment defects. The process comprises the following steps of casting, reference face machining, hole machining and connecting bolt hole manufacturing which are carried out in sequence. A heat treatment step is carried out between the casting step and the reference face machining step. The heat treatment step comprises quenching and tempering. According to the quenching process, staging temperature raising is carried out, and according to quenching cooling, furnace cooling and air cooling are carried out in sequence. According to oil cooling in tempering, blank materials are cooled to the temperature of 200-250 DEG C, and then air cooling is carried out. According to reference face machining, the end face of the blank materials is machined. According to hole machining, two steps of hole rough machining and hole fine machining are included, according to hole rough machining, through hole drilling is carried out, and a pre-drilled through hole is obtained. According to hole fine machining, boring cutters are used at the two ends of the pre-drilled through hole respectively for carrying out hole expanding treatment on the pre-drilled through hole, and finally a center circular hole of concentric different-diameter holes is obtained. The machining technology is simple in line, product quality is good, quality is easy to control, and meanwhile production efficiency is high.
Description
Technical field
The present invention relates to machining manufacturing process field, particularly relate to a kind of bearing block production process that reduces heat treating fault that is beneficial to.
Background technology
Prior art bottom bracket is widely used in rotating machinery, as the supporting member of bearing.On bearing block, 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 block and think that rotating shaft provides the strong point of two or more, screw pump bearing housing, the blower fan main shaft bearing housing of large-scale cooling tower etc. grown as power transmission shaft.
Center hole on prior art bottom bracket is generally made up of the circular hole of two sections of reducings and axis conllinear, the changeover portion of two sections of circular holes is as the shaft shoulder of bearing, install to simplify the structure of bearing block 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 wear extent 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 service 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 wear extent 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 service 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 bearing block production process that reduces heat treating fault that is beneficial to.
For the problems referred to above, a kind of bearing block production process that reduces heat treating fault that is beneficial to provided by the invention reaches goal of the invention by following technical essential: a kind of bearing block production process that reduces heat treating fault that is beneficial to, comprise following steps in sequence: casting, processing datum, hole processing, making connecting 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;
Described processing datum is the end face of turned blank;
Described hole is processed as processing and is positioned at the center hole in described end face axial, hole processing comprises roughing hole and two steps of Finish Machining Bore, described roughing hole is that the drill bit that adopts diameter to be less than bearing block center hole intended diameter carries out through hole to blank and drills, and obtains preboring through hole;
Described Finish Machining Bore is to adopt respectively boring cutter to carry out reaming processing to preboring through hole by the two ends of preboring through hole, and last arriving is the center hole of concentric different diameter hole;
Described processing datum is for adopting sawing machine successively end face to be cut in advance, utilize grinding machine to carry out bright and clean grinding, utilize shaping machine to plane taking the smooth surface that obtains as datum level to another end face to cutting in advance any one side in the end face obtaining, the end face that planing is obtained utilizes grinding machine to carry out bright and clean grinding.
In this process route, while adopting boring cutter to carry out reaming to preboring through hole, boring cutter is controlled at the width of the bearing for bearing block assembling that is slightly larger than design by the axial feed amount at the two ends of blank, like this, boring cutter, due to little along the axial depth of cut of center hole, can effectively reduce the wear extent of boring cutter in each reaming process, as in the screw pump bearing housing process of processing 300mm, for the bearing boring that model is 6216, station is installed, bore hole precision can be controlled in the scope of 0.015mm; Adopt bearing that above technique obtains center hole between station to be installed owing to being not used in and bearing fit, need to ensure that its diameter is greater than the diameter of axle like this, above technique also helps the production efficiency of bearing housing.
The processing datum process route arranging in this process route, adopt sawing machine to carry out size and cut in advance that to obtain product end surface comparatively smooth, it is that stock removal is little that any one side is carried out to grinding, the smooth surface obtaining after grinding completes is the datum level of another side, the form of the employing shaping machine comparatively realization of colleges and universities is determined thickness planing, to ensure the length dimension of product, meanwhile, adopt the form of shaping machine to also help the depth of parallelism that ensures two end faces; The end face surface roughness that above technique completes rear bearing block even can reach Ra0.8, is conducive to the airtight quality of bearing block joint face.
The heat treatment step arranging is used for eliminating or weakens the defects such as the crystalline structure being brought to blank by forging step is thick, component segregation, and after heat treatment completes, makes blank have suitable hardness to be suitable for follow-up machining.In above-mentioned heat treatment step, the selection of heating-up temperature, temperature retention 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 function admirables, 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 stress 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 heat of cooling stress remnants in the situation that ensureing quenching quality.
Further technical scheme is:
In ensureing that the wear extent of boring cutter in feed process is controlled at more among a small circle, to ensure the bore hole quality of center hole, the depth of cut numerical value of described boring cutter on center hole axis is within the scope of 20mm-60mm.
For ease of machining, between described casting and processing datum, processing datum and hole processing, hole processing and making connecting bolt hole, be provided with scribe step.
The present invention has following beneficial effect:
1, in this process route, while adopting boring cutter to carry out reaming to preboring through hole, boring cutter is controlled at the width of the bearing for bearing block assembling that is slightly larger than design by the axial feed amount at the two ends of blank, like this, boring cutter, due to little along the axial depth of cut of center hole, can effectively reduce the wear extent of boring cutter in each reaming process, as in the screw pump bearing housing process of processing 300mm, for the bearing boring that model is 6216, station is installed, bore hole precision can be controlled in the scope of 0.015mm; Adopt bearing that above technique obtains center hole between station to be installed owing to being not used in and bearing fit, need to ensure that its diameter is greater than the diameter of axle like this, above technique also helps the production efficiency of bearing housing.
2, the processing datum process route arranging in this process route, adopt sawing machine to carry out size and cut in advance that to obtain product end surface comparatively smooth, it is that stock removal is little that any one side is carried out to grinding, the smooth surface obtaining after grinding completes is the datum level of another side, the form of the employing shaping machine comparatively realization of colleges and universities is determined thickness planing, to ensure the length dimension of product, meanwhile, adopt the form of shaping machine to also help the depth of parallelism that ensures two end faces; The end face surface roughness that above technique completes rear bearing block even can reach Ra0.8, is conducive to the airtight quality of bearing block joint face.
3, the heat treatment step arranging is used for eliminating or weakens the defects such as the crystalline structure being brought to blank by forging step is thick, component segregation, and after heat treatment completes, makes blank have suitable hardness to be suitable for follow-up machining.In above-mentioned heat treatment step, the selection of heating-up temperature, temperature retention 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 function admirables, be conducive to the obdurability of blank, the product that above technique is obtained has good shock resistance.
4, 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 stress 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 heat of cooling stress remnants in the situation that ensureing quenching quality.
Detailed description of the invention
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 a bearing block production process that reduces heat treating fault, comprise following steps in sequence: casting, processing datum, hole processing, making connecting 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;
Described processing datum is the end face of turned blank;
Described hole is processed as processing and is positioned at the center hole in described end face axial, hole processing comprises roughing hole and two steps of Finish Machining Bore, described roughing hole is that the drill bit that adopts diameter to be less than bearing block center hole intended diameter carries out through hole to blank and drills, and obtains preboring through hole;
Described Finish Machining Bore is to adopt respectively boring cutter to carry out reaming processing to preboring through hole by the two ends of preboring through hole, and last arriving is the center hole of concentric different diameter hole;
Described processing datum is for adopting sawing machine successively end face to be cut in advance, utilize grinding machine to carry out bright and clean grinding, utilize shaping machine to plane taking the smooth surface that obtains as datum level to another end face to cutting in advance any one side in the end face obtaining, the end face that planing is obtained utilizes grinding machine to carry out bright and clean grinding.
In this process route, while adopting boring cutter to carry out reaming to preboring through hole, boring cutter is controlled at the width of the bearing for bearing block assembling that is slightly larger than design by the axial feed amount at the two ends of blank, like this, boring cutter, due to little along the axial depth of cut of center hole, can effectively reduce the wear extent of boring cutter in each reaming process, as in the screw pump bearing housing process of processing 300mm, for the bearing boring that model is 6216, station is installed, bore hole precision can be controlled in the scope of 0.015mm; Adopt bearing that above technique obtains center hole between station to be installed owing to being not used in and bearing fit, need to ensure that its diameter is greater than the diameter of axle like this, above technique also helps the production efficiency of bearing housing.
The processing datum process route arranging in this process route, adopt sawing machine to carry out size and cut in advance that to obtain product end surface comparatively smooth, it is that stock removal is little that any one side is carried out to grinding, the smooth surface obtaining after grinding completes is the datum level of another side, the form of the employing shaping machine comparatively realization of colleges and universities is determined thickness planing, to ensure the length dimension of product, meanwhile, adopt the form of shaping machine to also help the depth of parallelism that ensures two end faces; The end face surface roughness that above technique completes rear bearing block even can reach Ra0.8, is conducive to the airtight quality of bearing block joint face.
The heat treatment step arranging is used for eliminating or weakens the defects such as the crystalline structure being brought to blank by forging step is thick, component segregation, and after heat treatment completes, makes blank have suitable hardness to be suitable for follow-up machining.In above-mentioned heat treatment step, the selection of heating-up temperature, temperature retention 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 function admirables, 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 stress 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 heat of cooling stress remnants in the situation that ensureing quenching quality.
Embodiment 2:
The present embodiment is further qualified on the basis of embodiment 1: in ensureing that the wear extent of boring cutter in feed process is controlled at more among a small circle, to ensure the bore hole quality of center hole, the depth of cut numerical value of described boring cutter on center hole axis is within the scope of 20mm-60mm.
For ease of machining, between described casting and processing datum, processing datum and hole processing, hole processing and making connecting bolt hole, be provided with scribe step.
Above content is the further description of the present invention being done in conjunction with concrete preferred embodiment, 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 (3)
1. one kind is beneficial to the bearing block production process that reduces heat treating fault, comprise following steps in sequence: casting, processing datum, hole processing, making connecting 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;
Described processing datum is the end face of turned blank;
Described hole is processed as processing and is positioned at the center hole in described end face axial, hole processing comprises roughing hole and two steps of Finish Machining Bore, described roughing hole is that the drill bit that adopts diameter to be less than bearing block center hole intended diameter carries out through hole to blank and drills, and obtains preboring through hole;
Described Finish Machining Bore is to adopt respectively boring cutter to carry out reaming processing to preboring through hole by the two ends of preboring through hole, and last arriving is the center hole of concentric different diameter hole;
Described processing datum is for adopting sawing machine successively end face to be cut in advance, utilize grinding machine to carry out bright and clean grinding, utilize shaping machine to plane taking the smooth surface that obtains as datum level to another end face to cutting in advance any one side in the end face obtaining, the end face that planing is obtained utilizes grinding machine to carry out bright and clean grinding.
2. a kind of bearing block production process that reduces heat treating fault that is beneficial to according to claim 1, is characterized in that, the depth of cut numerical value of described boring cutter on center hole axis is within the scope of 20mm-60mm.
3. a kind of bearing block production process that reduces heat treating fault that is beneficial to according to claim 1, is characterized in that, between described casting and processing datum, processing datum and hole processing, hole processing and making connecting bolt hole, is provided with scribe step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410402741.2A CN104148901A (en) | 2014-08-17 | 2014-08-17 | Bearing base production process capable of well reducing heat treatment defects |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410402741.2A CN104148901A (en) | 2014-08-17 | 2014-08-17 | Bearing base production process capable of well reducing heat treatment defects |
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| CN104148901A true CN104148901A (en) | 2014-11-19 |
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| CN201410402741.2A Pending CN104148901A (en) | 2014-08-17 | 2014-08-17 | Bearing base production process capable of well reducing heat treatment defects |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106181279A (en) * | 2016-08-10 | 2016-12-07 | 台州华达工量具制造有限公司 | A kind of processing technique of cutter head changeable type depth drill |
| CN106591544A (en) * | 2016-12-26 | 2017-04-26 | 怀宁吉利来精密机械科技有限公司 | Casting process of alloy steel bearing pedestal |
| CN109731916A (en) * | 2019-03-08 | 2019-05-10 | 武汉钢铁有限公司 | Rolling mill bearing and its manufacturing method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106181279A (en) * | 2016-08-10 | 2016-12-07 | 台州华达工量具制造有限公司 | A kind of processing technique of cutter head changeable type depth drill |
| CN106181279B (en) * | 2016-08-10 | 2018-02-13 | 台州华达工量具制造有限公司 | A kind of processing technology of cutter head changeable type depth drill |
| CN106591544A (en) * | 2016-12-26 | 2017-04-26 | 怀宁吉利来精密机械科技有限公司 | Casting process of alloy steel bearing pedestal |
| CN109731916A (en) * | 2019-03-08 | 2019-05-10 | 武汉钢铁有限公司 | Rolling mill bearing and its manufacturing method |
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Application publication date: 20141119 |
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