CN107414100A - The turning tool and processing method of a kind of thin-walled cylindrical workpiece - Google Patents

The turning tool and processing method of a kind of thin-walled cylindrical workpiece Download PDF

Info

Publication number
CN107414100A
CN107414100A CN201710639005.2A CN201710639005A CN107414100A CN 107414100 A CN107414100 A CN 107414100A CN 201710639005 A CN201710639005 A CN 201710639005A CN 107414100 A CN107414100 A CN 107414100A
Authority
CN
China
Prior art keywords
workpiece
mandrel
plug
thin
turning tool
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201710639005.2A
Other languages
Chinese (zh)
Inventor
常根生
李红彬
张相相
武常生
崔闻天
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xinxing Energy Equipment Co Ltd
Original Assignee
Xinxing Energy Equipment Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Xinxing Energy Equipment Co Ltd filed Critical Xinxing Energy Equipment Co Ltd
Priority to CN201710639005.2A priority Critical patent/CN107414100A/en
Publication of CN107414100A publication Critical patent/CN107414100A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B5/00Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor
    • B23B5/08Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor for turning axles, bars, rods, tubes, rolls, i.e. shaft-turning lathes, roll lathes; Centreless turning
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B1/00Methods for turning or working essentially requiring the use of turning-machines; Use of auxiliary equipment in connection with such methods
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B23Q3/12Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for securing to a spindle in general

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling And Boring (AREA)

Abstract

The invention provides a kind of turning tool and method for turning for thin wall cylinder-shaped workpiece.The turning tool includes mandrel, non-porous plug, plug with holes and nut.Mandrel passes through from inner hole of workpiece, and non-porous plug and plug with holes are installed in both ends respectively, screws the nut at mandrel both ends, mandrel and workpiece are combined into one, and injects paraffin into the cavity of mandrel and workpiece by casting hole.Included using the thin-walled cylindrical workpiece procedure of processing of the turning tool:1)Rough turn cylindrical, endoporus and end face;2)Smart car endoporus and end face, length meet drawing size;3)Smart car endoporus is to drawing requirement;4)Frock and workpiece are combined;5)Mandrel both ends thimble location and installation;6)Use coolant, fine turning outer circle to drawing requirement.Using above-mentioned turning tool and processing method, solve turning thin-wall cylindrical workpiece deformation problem, ensure that the machining accuracy of thin wall cylinder-shaped workpiece.

Description

The turning tool and processing method of a kind of thin-walled cylindrical workpiece
Technical field
The invention belongs to field of machining, there is provided for a kind of turning tool of thin-walled cylindrical workpiece and turnery processing side Method.
Background technology
With the development of equipment manufacturing industry and the lifting of working ability, thin-walled parts are increasingly applied to each Ministry of Industry Door.Application of the thin wall cylinder-shaped workpiece in equipment increases increasingly, once the workpiece damage, it is difficult to pass through turning in a short time Method process, the turning of thin-wall workpiece deformation is always to perplex the problem of turnery processing.Thin wall cylinder-shaped workpiece turning When the reason for being deformed have clamping force, Cutting Force, turning heat, position error and an elastic deformation, wherein it is maximum to influence deformation It is clamping force and Cutting Force.
The content of the invention
Present invention solves the technical problem that it is:By designing and producing suitable frock and processing technology, effectively reduce and clamp The influence that power, Cutting Force, turning heat, position error and elastic deformation deform to thin-wall workpiece turning, solves thin wall cylinder-shaped work Part turning deforms problem.
The present invention adopts the technical scheme that:
A kind of turning tool of thin-walled cylindrical workpiece, including both ends are with externally threaded step mandrel, non-porous plug, plug with holes And nut.Mandrel is passed through into inner hole of workpiece, non-porous plug and plug with holes are installed respectively at mandrel both ends, screw mandrel both ends Nut, mandrel and workpiece are combined into one;Formed by the casting hole on plug with holes to mandrel, workpiece and both ends plug Paraffin is injected in cavity.
Further, the non-porous plug and plug with holes are band rib tubular axle sleeve structure, for ease of dismounting, two plugs Inner surface and mandrel both ends step small―gap suture interference fits, outer surface and the inner hole of workpiece small―gap suture transition of two plugs are matched somebody with somebody Close, to ensure the axiality of workpiece and mandrel.
Further, the centre hole of positioning is machined with the both ends end face center of the mandrel, during ensureing outer surface processing It is accurately positioned.
Using the thin-walled cylindrical workpiece processing method of above-mentioned turning tool, its step includes:
1)Rough turned piece is cylindrical, endoporus and end face, each 2~3mm of made allowance;
2)Smart car inner hole of workpiece and end face, length meet drawing size, 0.3~0.5mm of endoporus made allowance;
3)Smart car inner hole of workpiece is to drawing requirement;
4)Make above-mentioned turning tool, frock and workpiece are combined;
5)Mandrel both ends thimble location and installation;
6)Use coolant, smart car excircle of workpiece to drawing requirement.
The technological progress that the present invention obtains is:Turning tool is simple in construction, easy to operate, it is therefore prevented that clamping force, elasticity become Machining deformation caused by shape, position error, coordinate small Lathe quantity and coolant, solve the change of turning thin-wall cylindrical workpiece Shape problem, and ensure that the machining accuracy of thin wall cylinder-shaped workpiece.
Brief description of the drawings
Fig. 1 is embodiment product structure schematic diagram;
Fig. 2 is embodiment product and tool structure schematic diagram;
Wherein:The non-porous plugs of 1-, 2- paraffin, 3- workpiece, 4- mandrels, 5- plugs with holes, 6- nuts, 7- castings hole, 8- steps, 9- Center hole.
Embodiment
Fig. 1 is the present embodiment product structure schematic diagram, it can be seen that the long 400mm of thin_wall cylinder part, both ends The long wall thickness 2.5mm of 50mm, the middle nearly long wall thickness of 300mm only have 1mm.The workpiece of of this sort structure is more if produced in enormous quantities Using wall thickness 1mm steel pipe both ends upsetting process production.But for the processing factory of no upset equipment, separate room production is upset Processing cost is very high, and conventional method for turning can not be realized.
To realize that the single-piece work of thin_wall cylinder part produces, the invention provides a kind of simple turning tool, such as Fig. 2 institutes Show, be the present embodiment thin_wall cylinder part product and its tool structure schematic diagram.Both ends are carried into externally threaded step mandrel 4 Passed through from the endoporus of workpiece 3, non-porous plug 1 and plug with holes 5 are installed in both ends respectively, and two plugs are band rib sleeve shaft noose Structure, the inner surface of two plugs and the small―gap suture interference fits of step 8 at the both ends of mandrel 4, the outer surface of two plugs with workpiece 3 Hole small―gap suture interference fits, to ensure the axiality of mandrel 4 and workpiece 3 and easy to disassemble.The nut 6 at the both ends of mandrel 4 is screwed, is made Mandrel 4 and workpiece 3 are combined into one.Then formed by the casting hole 7 of plug 5 with holes to mandrel 4, workpiece 3 and two plugs Cavity injection paraffin 2.Paraffin injection uses pressure injection, and the situation that paraffin condensation is shunk is should be noted that when injecting paraffin 2, is mended at any time Paraffin solution is filled, to prevent paraffin shrinkage cavity phenomenon, or uses to be slowly injected into the later stage of paraffin injection and keeps pressure Method, avoid paraffin shrinkage cavity.
After paraffin is populated, the center hole 9 of the one end of mandrel 4 and the top cooperation of lathe bare terminal end, the other end are top Hole 9 and the top cooperation of tail stock, top axiality before and after guarantee.Installation have good positioning after, can turnery processing, because of cylinder Shape workpiece wall is thin, small Lathe quantity is used during turning, from appropriate coolant.
After above-mentioned frock, thin_wall cylinder part can realize turnery processing, and its turning process method is:
1)Rough turned piece is cylindrical, endoporus and end face, each 2~3mm of made allowance;
2)Smart car inner hole of workpiece and end face, length meet drawing size, 0.3~0.5mm of endoporus made allowance;
3)Smart car inner hole of workpiece is to drawing requirement;
4)Frock and workpiece are combined, inject paraffin;
5)The both ends of mandrel 4 thimble location and installation;
6)Use coolant, smart car excircle of workpiece to drawing requirement.
After processing, disassembling fixture, the paraffin in workpiece is melted, obtain the work that thin wall cylinder-shaped meets the requirement of drawing size Part.
Turning tool of the present invention is simple in construction, easy to operate, and clamping force is acted directly on mandrel 4, does not act on work On part 3, solves the problems, such as Workpiece clamping;Injection paraffin 2, solves the problems, such as work pieces process elastic deformation in workpiece;It is processed Coolant in journey prevents the turning heat in turning process;Small Lathe quantity Excircle machining solves Cutting Force problem on deformation;Core The center hole 9 and plug at axle both ends employ small―gap suture interference fits with step 8 and inner hole of workpiece, solve position error With dismounting problem.The present invention can obtain thin wall cylinder-shaped workpiece by turnery processing, and ensure that adding for thin wall cylinder-shaped workpiece Work precision.

Claims (4)

  1. A kind of 1. turning tool of thin-walled cylindrical workpiece, it is characterised in that:Externally threaded step mandrel is carried including both ends(4)、 Non-porous plug(1), plug with holes(5)And nut(6);The mandrel(4)Through workpiece(3)Endoporus, in mandrel(4)Both ends step (8)Place is installed by non-porous plug respectively(1)With plug with holes(5), screw mandrel(4)The nut at both ends(6), by mandrel(4)And work Part(3)It is combined into one;Pass through plug with holes(5)On casting hole(7)To mandrel(4), workpiece(3), non-porous plug(1)And band Hole plug(5)Paraffin is injected in the cavity of formation(2).
  2. 2. the turning tool of thin-walled cylindrical workpiece according to claim 1, it is characterised in that:The non-porous plug(1)With it is with holes Plug(5)For band rib tubular axle sleeve structure, the non-porous plug(1)With plug with holes(5)Inner surface and mandrel(4)Both ends Step(8)Gap interference fits, the non-porous plug(1)With plug with holes(5)Outer surface and workpiece(3)Interior interporal lacuna mistake Cross cooperation.
  3. 3. the turning tool of thin-walled cylindrical workpiece according to claim 1, it is characterised in that:In the mandrel(4)Both ends end Face center is machined with the centre hole of positioning(9).
  4. 4. a kind of usage right requires the thin-walled cylindrical workpiece processing method of 1 turning tool, it is characterised in that:Step includes:
    1)Rough turned piece is cylindrical, endoporus and end face, each 2~3mm of made allowance;
    2)Smart car inner hole of workpiece and end face, length meet drawing size, 0.3~0.5mm of endoporus made allowance;
    3)Smart car inner hole of workpiece is to drawing requirement;
    4)Usage right requires 1 turning tool, and frock and workpiece are combined;
    5)Mandrel(4)Both ends thimble location and installation;
    6)Use coolant, smart car excircle of workpiece to drawing requirement.
CN201710639005.2A 2017-07-31 2017-07-31 The turning tool and processing method of a kind of thin-walled cylindrical workpiece Pending CN107414100A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710639005.2A CN107414100A (en) 2017-07-31 2017-07-31 The turning tool and processing method of a kind of thin-walled cylindrical workpiece

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710639005.2A CN107414100A (en) 2017-07-31 2017-07-31 The turning tool and processing method of a kind of thin-walled cylindrical workpiece

Publications (1)

Publication Number Publication Date
CN107414100A true CN107414100A (en) 2017-12-01

Family

ID=60431495

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710639005.2A Pending CN107414100A (en) 2017-07-31 2017-07-31 The turning tool and processing method of a kind of thin-walled cylindrical workpiece

Country Status (1)

Country Link
CN (1) CN107414100A (en)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108788185A (en) * 2018-07-06 2018-11-13 安徽东风机电科技股份有限公司 A kind of processing method of ultra-thin part
CN109366207A (en) * 2018-11-29 2019-02-22 上海无线电设备研究所 The clamping device and its clamping method of the conformal optics revolving body head-shield of heavy caliber
CN109396766A (en) * 2018-11-30 2019-03-01 河南红宇精密机械有限公司 A kind of thin-wall case processing technology
CN110653646A (en) * 2019-09-30 2020-01-07 山西江淮重工有限责任公司 Clamping tool and clamping method for turning outer circles at two ends of large-diameter thin-wall long cylindrical part
CN111112954A (en) * 2020-01-03 2020-05-08 中国船舶重工集团公司第七0七研究所 Finish machining process method for inner cavity of floating drum of liquid floated gyroscope
CN112008095A (en) * 2020-07-29 2020-12-01 中国航发哈尔滨东安发动机有限公司 Machining method of helicopter fuel oil discharge pipe
CN112045124A (en) * 2020-08-28 2020-12-08 江阴南工锻造有限公司 Special core rod for cylinder barrel inner hole concave step and forming method
CN112518249A (en) * 2020-11-27 2021-03-19 烟台南山学院 Processing method of thin-wall round roller
CN112605404A (en) * 2020-12-27 2021-04-06 江苏吉鑫风能科技股份有限公司 Turning process of main shaft of oversized wind generating set
CN112643104A (en) * 2020-12-23 2021-04-13 大连长丰实业总公司 Numerical control milling tool and method for cantilever thin-wall structure
CN113084564A (en) * 2021-03-09 2021-07-09 武汉镁里镁科技有限公司 Long thin-wall pipe fitting machining clamp and machining method
CN113172451A (en) * 2021-05-07 2021-07-27 河南柴油机重工有限责任公司 Plug-in structure, clamping device of plug-in structure and using method
CN113199216A (en) * 2021-05-14 2021-08-03 上海江丰平芯电子科技有限公司 Preparation method of stainless steel clamping ring
CN114055688A (en) * 2021-11-10 2022-02-18 中国航发贵州黎阳航空动力有限公司 Method for enhancing processing rigidity of heat insulation cylinder and wax filling device
CN114055097A (en) * 2021-12-08 2022-02-18 湖北三江航天红阳机电有限公司 Method for machining tubular part with runner groove
CN114310201A (en) * 2022-03-04 2022-04-12 中国空气动力研究与发展中心高速空气动力研究所 Processing technology of large-diameter thin-wall deep-hole aluminum alloy cabin
CN114309672A (en) * 2022-01-18 2022-04-12 无锡润和叶片制造有限公司 Machining method for machining aviation thin-wall cone and cone cylindrical part by using vertical lathe
CN114985783A (en) * 2022-06-16 2022-09-02 山西平阳重工机械有限责任公司 Processing method for outer spigot of tip support body and thin-wall shell
CN115351590A (en) * 2022-08-24 2022-11-18 宁波江丰电子材料股份有限公司 Processing method of tube target

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106312119A (en) * 2016-10-21 2017-01-11 湘潭电机股份有限公司 Filling type core shaft
CN205967483U (en) * 2016-08-23 2017-02-22 杭州娃哈哈精密机械有限公司 Thin wall sleeve pipe clamping structure
CN206083898U (en) * 2016-11-01 2017-04-12 浙江解放机械制造有限公司 Anchor clamps of thin wall circle cylinder part outer wall processing usefulness
CN106624010A (en) * 2016-12-02 2017-05-10 江西昌河航空工业有限公司 Auxiliary tool for thin and long thin-wall tube type workpiece
CN106736693A (en) * 2016-12-23 2017-05-31 贵州黎阳航空动力有限公司 A kind of distortion-free processing method of thin-walled disk-like accessory
CN206335153U (en) * 2016-11-28 2017-07-18 中核四0四有限公司 A kind of Thin Stainless Steel walled workpieces turning clamp

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205967483U (en) * 2016-08-23 2017-02-22 杭州娃哈哈精密机械有限公司 Thin wall sleeve pipe clamping structure
CN106312119A (en) * 2016-10-21 2017-01-11 湘潭电机股份有限公司 Filling type core shaft
CN206083898U (en) * 2016-11-01 2017-04-12 浙江解放机械制造有限公司 Anchor clamps of thin wall circle cylinder part outer wall processing usefulness
CN206335153U (en) * 2016-11-28 2017-07-18 中核四0四有限公司 A kind of Thin Stainless Steel walled workpieces turning clamp
CN106624010A (en) * 2016-12-02 2017-05-10 江西昌河航空工业有限公司 Auxiliary tool for thin and long thin-wall tube type workpiece
CN106736693A (en) * 2016-12-23 2017-05-31 贵州黎阳航空动力有限公司 A kind of distortion-free processing method of thin-walled disk-like accessory

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
李德富等: "《车工工艺与技能训练》", 31 December 2011 *

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108788185A (en) * 2018-07-06 2018-11-13 安徽东风机电科技股份有限公司 A kind of processing method of ultra-thin part
CN109366207A (en) * 2018-11-29 2019-02-22 上海无线电设备研究所 The clamping device and its clamping method of the conformal optics revolving body head-shield of heavy caliber
CN109396766B (en) * 2018-11-30 2021-07-09 河南红宇精密机械有限公司 Thin-wall shell machining process method
CN109396766A (en) * 2018-11-30 2019-03-01 河南红宇精密机械有限公司 A kind of thin-wall case processing technology
CN110653646A (en) * 2019-09-30 2020-01-07 山西江淮重工有限责任公司 Clamping tool and clamping method for turning outer circles at two ends of large-diameter thin-wall long cylindrical part
CN111112954A (en) * 2020-01-03 2020-05-08 中国船舶重工集团公司第七0七研究所 Finish machining process method for inner cavity of floating drum of liquid floated gyroscope
CN111112954B (en) * 2020-01-03 2021-07-27 中国船舶重工集团公司第七0七研究所 Finish machining process method for inner cavity of floating drum of liquid floated gyroscope
CN112008095A (en) * 2020-07-29 2020-12-01 中国航发哈尔滨东安发动机有限公司 Machining method of helicopter fuel oil discharge pipe
CN112045124A (en) * 2020-08-28 2020-12-08 江阴南工锻造有限公司 Special core rod for cylinder barrel inner hole concave step and forming method
CN112518249A (en) * 2020-11-27 2021-03-19 烟台南山学院 Processing method of thin-wall round roller
CN112643104A (en) * 2020-12-23 2021-04-13 大连长丰实业总公司 Numerical control milling tool and method for cantilever thin-wall structure
CN112605404A (en) * 2020-12-27 2021-04-06 江苏吉鑫风能科技股份有限公司 Turning process of main shaft of oversized wind generating set
CN112605404B (en) * 2020-12-27 2022-04-05 江苏吉鑫风能科技股份有限公司 Turning process of main shaft of oversized wind generating set
CN113084564A (en) * 2021-03-09 2021-07-09 武汉镁里镁科技有限公司 Long thin-wall pipe fitting machining clamp and machining method
CN113172451A (en) * 2021-05-07 2021-07-27 河南柴油机重工有限责任公司 Plug-in structure, clamping device of plug-in structure and using method
CN113199216A (en) * 2021-05-14 2021-08-03 上海江丰平芯电子科技有限公司 Preparation method of stainless steel clamping ring
CN114055688A (en) * 2021-11-10 2022-02-18 中国航发贵州黎阳航空动力有限公司 Method for enhancing processing rigidity of heat insulation cylinder and wax filling device
CN114055097A (en) * 2021-12-08 2022-02-18 湖北三江航天红阳机电有限公司 Method for machining tubular part with runner groove
CN114309672A (en) * 2022-01-18 2022-04-12 无锡润和叶片制造有限公司 Machining method for machining aviation thin-wall cone and cone cylindrical part by using vertical lathe
CN114310201A (en) * 2022-03-04 2022-04-12 中国空气动力研究与发展中心高速空气动力研究所 Processing technology of large-diameter thin-wall deep-hole aluminum alloy cabin
CN114985783A (en) * 2022-06-16 2022-09-02 山西平阳重工机械有限责任公司 Processing method for outer spigot of tip support body and thin-wall shell
CN115351590A (en) * 2022-08-24 2022-11-18 宁波江丰电子材料股份有限公司 Processing method of tube target

Similar Documents

Publication Publication Date Title
CN107414100A (en) The turning tool and processing method of a kind of thin-walled cylindrical workpiece
CN105171158B (en) A kind of turborotor taper air film hole processing technology
CN204603909U (en) A kind of anti-deformation device of thin-wall tube-shaped element processing
CN102357773A (en) Processing method for preventing bar-shaped thin-wall part from deforming
CN104476117A (en) High-accuracy thin-wall bush machining method
CN203495272U (en) Outer wall machining clamp for blind hole thin-wall sleeve parts
CN103949847B (en) Utilize the method for the long thin walled cylinder body of bracing or strutting arrangement processing vapor turbine control valve
CN104607874A (en) Machining process of ultra-long cylindrical thin-wall part
CN107824822A (en) A kind of thin-wall rotation-type part cylindrical turning clamping method and device
CN203993534U (en) A kind of positioning fixture of fixing thin-wall tube-shaped part
CN102773398A (en) Method for forging slender and thick-walled pipe fittings
CN107649920A (en) A kind of clamping tool for processing cone-shaped hood class part
CN105290746A (en) Car swing arm shaft processing process
CN103071824A (en) Expansion core tool
CN106180783B (en) Elongated thin metallic tubd processing mold and mold, metal tube processing method
CN103433689A (en) Machining process of rod-like iron core
CN202539958U (en) Numerical control turning clamp for outer contour of focusing guide ring
CN204221443U (en) For differential side gear external splines slotting fixture
CN203316749U (en) Workpiece alignment device
CN204975573U (en) Process units of turning external screw thread
CN203900915U (en) Positioning mounting and dismounting device for ultra thin-walled cylinder type workpieces
CN203993201U (en) A kind of frock clamp of anti-machining deformation
CN209632597U (en) A kind of grip device of lathe process thin-wall circular dish type cavity mechanical part
CN101456124A (en) Method of increasing cord drill-rod screw processing quality
CN104325313A (en) Fixture for slotting male spline of axle shaft gear

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
CB03 Change of inventor or designer information
CB03 Change of inventor or designer information

Inventor after: Chang Gensheng

Inventor after: Li Hongbin

Inventor after: Wu Changsheng

Inventor after: Zhang Xiangxiang

Inventor after: Cui Wentian

Inventor before: Chang Gensheng

Inventor before: Li Hongbin

Inventor before: Zhang Xiangxiang

Inventor before: Wu Changsheng

Inventor before: Cui Wentian

WD01 Invention patent application deemed withdrawn after publication
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20171201