CN106975949A - Drilling tool for the connecting rod of automobile engine transmission system - Google Patents
Drilling tool for the connecting rod of automobile engine transmission system Download PDFInfo
- Publication number
- CN106975949A CN106975949A CN201610035980.8A CN201610035980A CN106975949A CN 106975949 A CN106975949 A CN 106975949A CN 201610035980 A CN201610035980 A CN 201610035980A CN 106975949 A CN106975949 A CN 106975949A
- Authority
- CN
- China
- Prior art keywords
- lid
- bar
- rod
- fixture
- alignment pin
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, 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
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
- B23Q3/08—Work-clamping means other than mechanically-actuated
- B23Q3/082—Work-clamping means other than mechanically-actuated hydraulically actuated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, 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
- B23Q2703/00—Work clamping
- B23Q2703/02—Work clamping means
- B23Q2703/08—Devices for clamping a plurality of workpieces
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling And Boring (AREA)
Abstract
The invention discloses a kind of drilling tool of the connecting rod for automobile engine transmission system, the connecting rod includes the body of rod and lid, the drilling tool includes main body, drilling rod hole fixture and bores cap bore fixture, drilling rod hole fixture and the brill cap bore fixture are respectively mounted on the body, drilling rod hole fixture includes bar and slides positioning seat, macropore alignment pin, bar positioning seat and aperture alignment pin, and the brill cap bore fixture includes lid alignment pin, lid preloading spring, lid slip locating piece, lid and slides positioning seat, lid pretension push rod and lid and promote oil cylinder；The present invention is used for the drilling tool of the connecting rod of automobile engine transmission system when carrying out rod aperture processing, the body of rod is realized by macropore alignment pin and aperture alignment pin and positioned, when carrying out cap bore processing, locating piece is slided by lid alignment pin and lid behavior is carried out to lid, auxiliary base need not be manufactured, work step can be effectively reduced, reduces difficulty of processing, processing cost is reduced.
Description
Technical field
The present invention relates to a kind of frock, more particularly to a kind of connecting rod for automobile engine transmission system
Drilling tool.
Background technology
The enterprise manufactured at present in automobile engine transmission system connecting rod, all has manufacturing cost height, effect
The reason for low state of rate causes this state is connecting rod product in design and actual production, auxiliary facility
Disconnect, the frock clamp of more no advanced design meets the variation of product during enterprise's specific implementation production.
Existing connecting rod manufacture is positioned with technique shoulder breadth, high to the processing request of technique shoulder breadth, linear dimension tolerance
Typically between 0.02~0.04, and it is first to manufacture auxiliary base reprocessing product, it is impossible to effective to ensure to set
Meter benchmark is overlapped with technological datum, so as to add error amount；One technological datum of increase means that many
A work step is processed, equipment, cutter, inspection equipment input substantial contribution, are unfavorable to cost control；
Different part numbers require different to shoulder width, also corresponding to increase the difficulty of processing to frock clamp body,
And a large amount of management of accessory.
The content of the invention
The purpose of the present invention, which is that, provides a kind of for automobile engine power train in order to solve the above problems
The drilling tool of the connecting rod of system.
The present invention is achieved through the following technical solutions above-mentioned purpose：
A kind of drilling tool of connecting rod for automobile engine transmission system, the connecting rod includes the body of rod
And lid, the drilling tool is including main body, drilling rod hole fixture and bores cap bore fixture, drilling rod hole fixture
With it is described brill cap bore fixture be respectively mounted on the body, drilling rod hole fixture include bar slide positioning seat,
Macropore alignment pin, bar positioning seat and aperture alignment pin, the bar slides positioning seat and the bar positioning seat is fixed
On the body, the macropore alignment pin slides locating piece with the bar that bar slip positioning seat is connected and fixed
Connection, the brill cap bore fixture slides locating piece, lid and slided including lid alignment pin, lid preloading spring, lid to be determined
Position seat, lid pretension push rod and lid promote oil cylinder, and the lid promotes the telescopic end of oil cylinder to pass through the lid pretension bullet
Spring is fixedly connected with the lower end of the lid pretension push rod, and the lid slides positioning seat and is fixedly connected with the main body,
The lid slides locating piece and slides positioning seat slidable connection with the lid and promote the flexible of oil cylinder with the lid
End is fixedly connected, and the lid alignment pin is arranged on the top of the lid early warning push rod.
Specifically, drilling rod hole fixture also includes bar positioning linkage board, bar positional cylinder, bar positioning linkage
Screw rod, bar compressed oil cylinder, rod oil cylinder install float plate, bar and tense guide blot and bar tie rod, the bar
Tie rod slides locating piece with the bar and is fixedly connected, and the bar slides locating piece and slides positioning seat with the bar
Slidable connection, the lower end that the bar slides locating piece is fixedly connected with bar positioning linkage board, the bar
Positioning linkage board positions linkage screw by the bar and is connected with the bar positional cylinder, and the rod oil cylinder is installed
Float plate is located at the bar and slides the rear side of fixed seat and be secured to connection, the bar compressed oil cylinder it is flexible
End is installed float plate with the rod oil cylinder and is connected, and the bar tenses guide blot and floated with rod oil cylinder installation
Plate is fixedly connected and may move with bar slip locating piece and is connected.
Further, drilling rod hole fixture also includes pressing article, and the pressing article, which is arranged on the bar and slided, to be determined
On the leading flank of position seat.
Specifically, the brill cap bore fixture also includes lid tie rod, lid location-plate, lid support block and lid baffle plate,
The lid location-plate is located at the top of the lid early warning push rod, the lid tie rod and the lid alignment pin with
The lid location-plate is fixedly connected, and two lid support blocks are separately positioned on the lid and slide the two of locating piece
Individual upper end, the lid baffle plate setting is in the outside of the interactive positioning seat of the lid and the lid preloading spring.
Preferably, the bottom surface of the main body, left and right side and trailing flank are provided with the oil circuit being connected with oil cylinder
Interface.
Specifically, drilling rod hole fixture and the brill cap bore fixture are vertically arranged in the front side of the main body
Face, axis of two macropore alignment pins along drilling rod hole fixture is symmetrical, and the aperture positions pins position
In on the axis of drilling rod hole fixture, the axis of fixture of two lid alignment pins along the brill cap bore
Line is symmetrical arranged, and the lid pretension bar, the lid slide locating piece, the lid and slide positioning seat, the lid
Preloading spring, the lid promote axis of the center line of oil cylinder with the brill cap bore fixture to overlap.
Preferably, the exterior arc surface of two macropore alignment pins and the macropore circular arc of the body of rod are tangent, and two
The macropore circular arc of the exterior arc surface and the lid of the individual lid alignment pin is tangent.
The beneficial effects of the present invention are：
The present invention is used for the drilling tool of the connecting rod of automobile engine transmission system when carrying out rod aperture processing,
The body of rod is realized by macropore alignment pin and aperture alignment pin and positioned, it is fixed by lid when carrying out cap bore processing
Position pin and lid slide locating piece and carry out behavior to lid, it is not necessary to manufacture auxiliary base, can effectively reduce work
Step, reduces difficulty of processing, reduces processing cost.
Brief description of the drawings
Fig. 1 is that the structure of the drilling tool of the connecting rod of the present invention for automobile engine transmission system is shown
It is intended to；
Fig. 2 is the front view of the drilling tool of the connecting rod of the present invention for automobile engine transmission system；
Fig. 3 is the structural representation of drilling rod hole tool of the present invention；
Fig. 4 is making in groups for the drilling tool of the connecting rod of the present invention for automobile engine transmission system
Use schematic diagram.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings：
As shown in figure 1, a kind of drilling tool of connecting rod for automobile engine transmission system of the invention,
Connecting rod includes the body of rod 4 and lid 13, and drilling tool includes main body 100, drilling rod hole fixture 200 and bores lid
Hole fixture 300, drilling rod hole fixture 200 and brill cap bore fixture 300 are installed in main body 100；
As shown in Figures 2 and 3, drilling rod hole fixture 200 include bar slide positioning seat 1, macropore alignment pin 9,
Bar positioning seat 5, aperture alignment pin 6, bar positioning linkage board 22, bar positional cylinder 23, bar positioning linkage spiral shell
Bar 24, bar compressed oil cylinder 25, rod oil cylinder install float plate 26, bar and tense guide blot 7, bar tie rod 8
With pressing article 2, bar slides positioning seat 1 and bar positioning seat 5 and is fixed in main body 100, macropore alignment pin 9 with
The bar slip locating piece 21 that bar slides the connection of positioning seat 1 is fixedly connected, and bar tie rod 8 slides locating piece with bar
21 are fixedly connected, and bar slides locating piece 21 and slides the slidable connection of positioning seat 1 with bar, and bar slides locating piece
21 lower end is fixedly connected with bar positioning linkage board 22, and bar positioning linkage board 22 positions linkage screw by bar
24 are connected with bar positional cylinder 23, rod oil cylinder install float plate 26 be located at bar slide fixed seat rear side and with
It is fixedly connected, and telescopic end and the rod oil cylinder of bar compressed oil cylinder 25 are installed float plate 26 and be connected, and bar is tensed and led
It is fixedly connected and is may move with bar slip locating piece 21 to bolt 7 and rod oil cylinder installation float plate 26 and is connected,
Pressing article 2 be arranged on bar slide positioning seat 1 leading flank on, the exterior arc surface of two macropore alignment pins 9 with
The macropore circular arc of the body of rod 4 is tangent.
As shown in Fig. 2 boring cap bore fixture 300 includes lid alignment pin 11, lid preloading spring 18, covers to slide and determine
Position block 16, lid slide positioning seat 17, lid pretension push rod 15, lid and promote oil cylinder 20, lid tie rod 10, lid
Location-plate 12, lid support block 14 and lid baffle plate 19, lid promote the telescopic end of oil cylinder 20 to pass through lid preloading spring
18 are fixedly connected with the lower end of lid pretension push rod 15, and lid slides positioning seat 17 and is fixedly connected with main body 100,
Lid slides locating piece 16 and slides the slidable connection of positioning seat 17 with lid and promote the telescopic end of oil cylinder 20 to consolidate with lid
Fixed connection, lid alignment pin 11 is arranged on the top of lid early warning push rod, states lid location-plate 12 positioned at lid early warning top
The top of bar, lid tie rod 10 and lid alignment pin 11 are fixedly connected with lid location-plate 12, two lid supports
Block 14 is separately positioned on two upper ends that lid slides locating piece 16, and lid baffle plate 19 is arranged on the interactive positioning seat of lid
With the outside of lid preloading spring 18, bottom surface, left and right side and the trailing flank of main body 100 are provided with and oil cylinder
The oil circuit interface of connection,
Drilling rod hole fixture 200 and brill cap bore fixture 300 are vertically arranged in the leading flank of main body 100, two
Axis of the macropore alignment pin 9 along drilling rod hole fixture 200 is symmetrical, and aperture alignment pin 6 is located at drilling rod hole fixture
On 200 axis, axis of two lid alignment pins 11 along the fixture for boring cap bore is symmetrical arranged, lid pretension
Bar, lid slide locating piece 16, lid slip positioning seat 17, lid preloading spring 18, lid and promoted in oil cylinder 20
Line is overlapped with boring the axis of cap bore fixture 300, exterior arc surface and the lid 13 of two lid alignment pins 11
Macropore circular arc it is tangent.
The present invention is as follows for the operation principle of the drilling tool of the connecting rod of automobile engine transmission system：
Drilling rod hole be mainly guarantee macropore and bores cylinder sleeve, thread Pilot hole keep symmetrically, centre-to-centre spacing length, put down
Row degree is relative to big aperture datum line ＜ 0.02, and the design mainly uses aperture alignment pin 6 to be supported for part
Origin is rotated, is moved down using the balanced configuration of macropore alignment pin 9 (symmetry ＜ 0.02), aperture positioning
The tangent guarantee holes linearity of macropore circular arc of the exterior arc surface of pin 6 and the body of rod 4, forms the design basis of the body of rod 4
The device systems origin of coordinates is overlapped during with processing, is eliminated shoulder to holes and is bored cylinder sleeve, thread Pilot hole
Between the error of relativeness that produces.Because macropore alignment pin 9 pulls down tightening position, the body of rod 4 can be produced
Raw larger pressure causes deformation, therefore tightening force need to be controlled in F=20Kg~40Kg downwards, due to tense detent force compared with
It is small to offset drilling when the lateral component that produces to brill cylinder sleeve, thread Pilot hole centre-to-centre spacing influence, therefore bar
Oil cylinder needs to provide larger torque F=470Kg~540Kg when body 4 is compressed.
Boring cap bore requirement substantially consistent with rod aperture requirement, but bore cap bore does not have the strong point in drilling rod hole, and Gu Gai is fixed
Lid slides locating piece 16 and moved up during position, and lid pretension Top bars support lid 13 is moved up, lid 13
Inner hole wall with lid alignment pin 11 is tangent contacts, due to by the position limitation of lid alignment pin 11, lid pretension push rod 15
Downward compression cover preloading spring 18, which shrinks, forms Auxiliary support point, and shifting is continued up when lid slides locating piece 16
Dynamic, unilateral lid support block 14 and the boss single edge contact of lid 13 is the progress axial-rotation of lid 13, boss
The lid support block 14 of both sides, which is completely attached to, reaches that poised state i.e. positioning terminates；Lid localization machine is given during lid positioning
The enough reflecting times of tool, can be reached in the hydraulic coupling transmission channel of main body 100 by changing the diameter of fuel feed hole
To control effect, positioning reflecting time control is in 0.5S~1.5S, and lid positioning states are consistent with bar positioning states all
Stress control during strict control positioning is needed to prevent deformation, location torque and clamping torque are referring to bar data.
Bar steps up state and mobile status uses floating structure, effective to solve to step up the balance between movement,
Bar slides the prefabricated relation slided in bar in positioning seat 1, effectively solve guiding and positioning of locating piece 21, main
Gap between the two is controlled to coordinate bar between 0.02~0.035, roughness Ra 0.8, main body 100 to position
Relative position relation symmetry ＜ 0.02, the position degree ＜ 0.02 of seat 5, such as Fig. 3 bar positioning compression gears
Structure structural map, can intuitively see bar positional cylinder 23, bar positioning linkage board 22, bar positioning linkage spiral shell very much
Bar 24 and bar slide the composition mobile position-fixed module of locating piece 21, and bar compressed oil cylinder 25, rod oil cylinder, which are installed, to float
Plate 26, bar tense guide blot 7, bar backing plate and the composition compression module of bar tie rod 8.
Positioning compression process is provided using hydraulic means, coordinates corresponding hydraulic control unit, is suitable for automatic
Change and semi-automatic demand, reduction labor intensity improves production efficiency.As shown in figure 4, this drilling tool can
It can be supported the use in groups with modularized design, multiple drilling tools are uniformly distributed successively, and its main body 100
Lower end is fixedly connected by cushion block 600 with bottom plate 400, is entered between multiple drilling tools by flow plate 500
Row fluid path is connected.
Technical scheme is not limited to the limitation of above-mentioned specific embodiment, every technique according to the invention
The technology deformation that scheme is made, each falls within protection scope of the present invention.
Claims (7)
1. a kind of drilling tool of connecting rod for automobile engine transmission system, the connecting rod includes bar
Body and lid, it is characterised in that：The drilling tool includes main body, drilling rod hole fixture and bores cap bore fixture,
Drilling rod hole fixture and the brill cap bore fixture are respectively mounted on the body, and drilling rod hole fixture includes
Bar slides positioning seat, macropore alignment pin, bar positioning seat and aperture alignment pin, and the bar slides positioning seat and institute
State bar positioning seat to fix on the body, the macropore alignment pin slides the bar that positioning seat is connected with the bar
Slide locating piece to be fixedly connected, it is fixed that the brill cap bore fixture is slided including lid alignment pin, lid preloading spring, lid
Position block, lid slide positioning seat, lid pretension push rod and lid and promote oil cylinder, and the lid promotes the telescopic end of oil cylinder to lead to
The lower end that the lid preloading spring is crossed with the lid pretension push rod is fixedly connected, and the lid slides positioning seat and institute
Main body is stated to be fixedly connected, it is described lid slide locating piece with it is described lid slip positioning seat slidable connection and with it is described
Lid promotes the telescopic end of oil cylinder to be fixedly connected, and the lid alignment pin is arranged on the top of the lid early warning push rod.
2. the drilling tool of the connecting rod according to claim 1 for automobile engine transmission system,
It is characterized in that：Drilling rod hole fixture also includes bar positioning linkage board, bar positional cylinder, bar positioning linkage
Screw rod, bar compressed oil cylinder, rod oil cylinder install float plate, bar and tense guide blot and bar tie rod, the bar
Tie rod slides locating piece with the bar and is fixedly connected, and the bar slides locating piece can with the slip positioning seat
It is slidably connected, the lower end that the bar slides locating piece is fixedly connected with bar positioning linkage board, and the bar is determined
Position linkage board positions linkage screw by the bar and is connected with the bar positional cylinder, and the rod oil cylinder is installed floating
Dynamic plate is located at the bar and slides the rear side of fixed seat and be secured to connection, the telescopic end of the bar compressed oil cylinder
Float plate is installed with the rod oil cylinder to be connected, the bar tenses guide blot and installs float plate with the rod oil cylinder
It is fixedly connected and may move with bar slip locating piece and is connected.
3. the drilling tool of the connecting rod according to claim 2 for automobile engine transmission system,
It is characterized in that：Drilling rod hole fixture also includes pressing article, and the pressing article, which is arranged on the bar and slided, to be determined
On the leading flank of position seat.
4. the drilling tool of the connecting rod according to claim 1 for automobile engine transmission system,
It is characterized in that：The brill cap bore fixture also includes lid tie rod, lid location-plate, lid support block and lid baffle plate,
The lid location-plate is located at the top of the lid early warning push rod, the lid tie rod and the lid alignment pin with
The lid location-plate is fixedly connected, and two lid support blocks are separately positioned on the lid and slide the two of locating piece
Individual upper end, the lid baffle plate setting is in the outside of the interactive positioning seat of the lid and the lid preloading spring.
5. the drilling tool of the connecting rod according to claim 1 for automobile engine transmission system,
It is characterized in that：Bottom surface, left and right side and the trailing flank of the main body are provided with the oil circuit being connected with oil cylinder
Interface.
6. the drilling tool of the connecting rod according to claim 1 for automobile engine transmission system,
It is characterized in that：Drilling rod hole fixture and the brill cap bore fixture are vertically arranged in the front side of the main body
Face, axis of two macropore alignment pins along drilling rod hole fixture is symmetrical, and the aperture positions pins position
In on the axis of drilling rod hole fixture, the axis of fixture of two lid alignment pins along the brill cap bore
Line is symmetrical arranged, and the lid pretension bar, the lid slide locating piece, the lid and slide positioning seat, the lid
Preloading spring, the lid promote axis of the center line of oil cylinder with the brill cap bore fixture to overlap.
7. the drilling tool of the connecting rod according to claim 6 for automobile engine transmission system,
It is characterized in that：The exterior arc surface of two macropore alignment pins and the macropore circular arc of the body of rod are tangent, and two
The macropore circular arc of the exterior arc surface and the lid of the individual lid alignment pin is tangent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610035980.8A CN106975949B (en) | 2016-01-19 | 2016-01-19 | The drilling tool of connecting rod for automobile engine transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610035980.8A CN106975949B (en) | 2016-01-19 | 2016-01-19 | The drilling tool of connecting rod for automobile engine transmission system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106975949A true CN106975949A (en) | 2017-07-25 |
| CN106975949B CN106975949B (en) | 2019-01-01 |
Family
ID=59341121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610035980.8A Active CN106975949B (en) | 2016-01-19 | 2016-01-19 | The drilling tool of connecting rod for automobile engine transmission system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106975949B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109571095A (en) * | 2019-01-24 | 2019-04-05 | 马鞍山市德善金属成型科技有限公司 | A kind of cylinder side opening can swinging process fixing tool |
| CN110977325A (en) * | 2020-01-21 | 2020-04-10 | 中车洛阳机车有限公司 | Restoring, planing and milling combined device for DF4D diesel locomotive connecting rod tooth part |
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| CN202780581U (en) * | 2012-09-13 | 2013-03-13 | 潍坊润搏机械有限公司 | Dedicated fixture for connecting rod cap of diesel engine |
| CN202804753U (en) * | 2012-07-28 | 2013-03-20 | 浙江强能动力有限公司 | Rocker center hole machining and positioning fixture |
| CN203371291U (en) * | 2013-06-17 | 2014-01-01 | 成都鸿泰机械有限公司 | Processing clamp for connecting rod of engine |
| CN203566378U (en) * | 2013-11-28 | 2014-04-30 | 慈溪市华炎机械有限公司 | Special clamp for drilling threaded holes in connecting rod |
| CN104289944A (en) * | 2014-11-06 | 2015-01-21 | 丁毅 | Positioning fixture for drilling hole in small end of connecting rod |
| CN204248482U (en) * | 2014-11-18 | 2015-04-08 | 盛瑞传动股份有限公司 | A kind of connecting rod Compound Machining fixture |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE19900292C2 (en) * | 1998-01-26 | 2002-10-02 | Gen Motors Corp | Universal clamping device and method for positioning and clamping for connecting rods |
| KR100786453B1 (en) * | 2007-09-05 | 2007-12-17 | 최재규 | Clamping equipment of cnc lathe for manufacturing tie rod end of vehicle |
| CN101306504A (en) * | 2008-06-20 | 2008-11-19 | 江苏银河机械有限公司 | Double boring cutter boring connection rod bolt location hole flexible clamping device |
| CN201760771U (en) * | 2010-04-16 | 2011-03-16 | 南车戚墅堰机车有限公司 | Connecting rod body and cover machining device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109571095A (en) * | 2019-01-24 | 2019-04-05 | 马鞍山市德善金属成型科技有限公司 | A kind of cylinder side opening can swinging process fixing tool |
| CN109571095B (en) * | 2019-01-24 | 2024-03-19 | 马鞍山市德善金属成型科技有限公司 | Tool for machining and fixing swingable angle of side hole of air cylinder |
| CN110977325A (en) * | 2020-01-21 | 2020-04-10 | 中车洛阳机车有限公司 | Restoring, planing and milling combined device for DF4D diesel locomotive connecting rod tooth part |
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| Publication number | Publication date |
|---|---|
| CN106975949B (en) | 2019-01-01 |
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