CN104148902A - Machining method benefiting to hole boring quality and bearing base mechanical property - Google Patents
Machining method benefiting to hole boring quality and bearing base mechanical property Download PDFInfo
- Publication number
- CN104148902A CN104148902A CN201410402750.1A CN201410402750A CN104148902A CN 104148902 A CN104148902 A CN 104148902A CN 201410402750 A CN201410402750 A CN 201410402750A CN 104148902 A CN104148902 A CN 104148902A
- Authority
- CN
- China
- Prior art keywords
- hole
- processing
- machining
- face
- datum
- 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
Links
Classifications
-
- 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
-
- 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
Landscapes
- 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)
- Forging (AREA)
- Drilling And Boring (AREA)
Abstract
The invention discloses a machining method benefiting to hole boring quality and bearing base mechanical property. The method 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 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 processing method that is beneficial to bore hole quality and bearing block mechanical property.
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 processing method that is beneficial to bore hole quality and bearing block mechanical property.
For the problems referred to above, a kind of processing method that is beneficial to bore hole quality and bearing block mechanical property provided by the invention reaches goal of the invention by following technical essential: a kind of processing method that is beneficial to bore hole quality and bearing block mechanical property, 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;
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.
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.
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:
A processing method that is beneficial to bore hole quality and bearing block mechanical property, comprises 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;
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.
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 processing method of bore hole quality and bearing block mechanical property, 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;
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 processing method that is beneficial to bore hole quality and bearing block mechanical property 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 processing method that is beneficial to bore hole quality and bearing block mechanical property according to claim 1, it is characterized in that, between described casting and processing datum, processing datum and hole processing, hole processing and making connecting bolt hole, be provided with scribe step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410402750.1A CN104148902A (en) | 2014-08-17 | 2014-08-17 | Machining method benefiting to hole boring quality and bearing base mechanical property |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410402750.1A CN104148902A (en) | 2014-08-17 | 2014-08-17 | Machining method benefiting to hole boring quality and bearing base mechanical property |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104148902A true CN104148902A (en) | 2014-11-19 |
Family
ID=51874619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410402750.1A Pending CN104148902A (en) | 2014-08-17 | 2014-08-17 | Machining method benefiting to hole boring quality and bearing base mechanical property |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104148902A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104815997A (en) * | 2015-04-17 | 2015-08-05 | 柳州蔚园塑料彩印包装有限责任公司 | Boring method for small-hole plastic part |
| CN104816341A (en) * | 2015-04-17 | 2015-08-05 | 柳州蔚园塑料彩印包装有限责任公司 | Boring method of toughened plastic part |
| CN104942547A (en) * | 2015-07-01 | 2015-09-30 | 庄有土 | Technology for manufacturing mounted bearing pedestal and numerical control special machine tool thereof |
| 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 |
| 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 |
| CN109026454A (en) * | 2018-08-16 | 2018-12-18 | 全椒县全动机械有限公司 | A kind of Waste-gas fan-swinging supercharging device of single-cylinder diesel and its manufacturing process |
| CN109731916A (en) * | 2019-03-08 | 2019-05-10 | 武汉钢铁有限公司 | Rolling mill bearing and its manufacturing method |
| CN111250929A (en) * | 2020-01-18 | 2020-06-09 | 浙江农业商贸职业学院 | Machining method for preventing roundness of bearing hole of bearing pedestal from being poor in locking state |
| 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 (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4754540A (en) * | 1987-02-11 | 1988-07-05 | Cincinnati Milacron Inc. | Method of making bearing block for robotic manipulator |
| CN102152075A (en) * | 2011-03-18 | 2011-08-17 | 威尔机械江苏有限公司 | Method for processing bearing pedestal of continuous casting machine |
| CN102398143A (en) * | 2011-10-24 | 2012-04-04 | 黄乃亨 | Manufacturing method of a gear box body |
| CN103639665A (en) * | 2013-12-04 | 2014-03-19 | 鞠小平 | Machining method of driving bevel gear bearing seat |
| CN103707007A (en) * | 2013-12-04 | 2014-04-09 | 鞠小平 | Method for machining bearing block of active bevel gear |
-
2014
- 2014-08-17 CN CN201410402750.1A patent/CN104148902A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4754540A (en) * | 1987-02-11 | 1988-07-05 | Cincinnati Milacron Inc. | Method of making bearing block for robotic manipulator |
| CN102152075A (en) * | 2011-03-18 | 2011-08-17 | 威尔机械江苏有限公司 | Method for processing bearing pedestal of continuous casting machine |
| CN102398143A (en) * | 2011-10-24 | 2012-04-04 | 黄乃亨 | Manufacturing method of a gear box body |
| CN103639665A (en) * | 2013-12-04 | 2014-03-19 | 鞠小平 | Machining method of driving bevel gear bearing seat |
| CN103707007A (en) * | 2013-12-04 | 2014-04-09 | 鞠小平 | Method for machining bearing block of active bevel gear |
Non-Patent Citations (2)
| Title |
|---|
| 国家机械委技工培训教材编写组: "《机械工人技术理论培训教材配套习题集 中级镗铣工工艺学》", 30 June 1989, 机械工业出版社 * |
| 钱同一: "《机械制造工艺基础》", 31 August 1997, 北京：冶金工业出版社 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104815997A (en) * | 2015-04-17 | 2015-08-05 | 柳州蔚园塑料彩印包装有限责任公司 | Boring method for small-hole plastic part |
| CN104816341A (en) * | 2015-04-17 | 2015-08-05 | 柳州蔚园塑料彩印包装有限责任公司 | Boring method of toughened plastic part |
| CN104815997B (en) * | 2015-04-17 | 2017-04-12 | 柳州蔚园塑料彩印包装有限责任公司 | Boring method for small-hole plastic part |
| CN104942547A (en) * | 2015-07-01 | 2015-09-30 | 庄有土 | Technology for manufacturing mounted bearing pedestal and numerical control special machine tool thereof |
| 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 |
| 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 |
| CN109026454A (en) * | 2018-08-16 | 2018-12-18 | 全椒县全动机械有限公司 | A kind of Waste-gas fan-swinging supercharging device of single-cylinder diesel and its manufacturing process |
| CN109731916A (en) * | 2019-03-08 | 2019-05-10 | 武汉钢铁有限公司 | Rolling mill bearing and its manufacturing method |
| CN111250929A (en) * | 2020-01-18 | 2020-06-09 | 浙江农业商贸职业学院 | Machining method for preventing roundness of bearing hole of bearing pedestal from being poor in locking state |
| 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104148902A (en) | Machining method benefiting to hole boring quality and bearing base mechanical property | |
| CN106079113B (en) | The expansion bit of detachable cutter head | |
| CN208437692U (en) | Knife tower crane structure for full machining type lathe | |
| CN205254175U (en) | Major diameter BTA frock | |
| CN104259758A (en) | Bearing block machining method beneficial to boring precision | |
| CN104128762A (en) | Lathe spindle machining technology facilitating machining efficiency and product quality | |
| CN104259761A (en) | Machining method beneficial to bearing seat production quality | |
| CN104148901A (en) | Bearing base production process capable of well reducing heat treatment defects | |
| CN105234643A (en) | Manufacture method for stepped shaft | |
| CN104191171A (en) | Method for machining bearing block for bearing impact loads | |
| CN104128759A (en) | Lathe spindle machining process beneficial to spindle surface hardness | |
| CN104128763A (en) | Lathe spindle machining process | |
| CN104191172A (en) | Method for machining alloy steel bearing seat | |
| CN205816834U (en) | A kind of compound tool | |
| CN104128757A (en) | Lathe spindle machining technology facilitating surface hardenability depth | |
| CN211028939U (en) | Nine gyration of numerical control are bored and are attacked milling device | |
| CN102785064A (en) | Method for processing cross axle | |
| CN104551542A (en) | Super-long deep hole machining method for 4145H drill collar steel | |
| CN103737257A (en) | Method for machining textile roller shaft heads | |
| CN101716688B (en) | Processing method of special electric power fitting taper sleeve taper hole for carbon fibre compound core wires and special device thereof | |
| CN204584328U (en) | Adjustable counterbore oppositely draws boring machining device and supporting feeler block thereof | |
| CN206066711U (en) | The expansion bit of detachable cutter head | |
| CN104128753A (en) | Lathe spindle machining technology facilitating machining efficiency and surface quality | |
| CN106216954A (en) | A kind of processing is hardened after deep cooling the method for martensitic steel alloys cold roll completely | |
| CN106735403A (en) | A kind of drill bit device and its boring method in arbitrary shape hole |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20141119 |
|
| RJ01 | Rejection of invention patent application after publication |