CN104875045B - A kind of outline needs the flexible jig of the workpiece of milling - Google Patents
A kind of outline needs the flexible jig of the workpiece of milling Download PDFInfo
- Publication number
- CN104875045B CN104875045B CN201510279931.4A CN201510279931A CN104875045B CN 104875045 B CN104875045 B CN 104875045B CN 201510279931 A CN201510279931 A CN 201510279931A CN 104875045 B CN104875045 B CN 104875045B
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- workpiece
- base
- positioner
- milling
- outline
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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
- B23Q3/069—Work-clamping means for pressing workpieces against a work-table
-
- 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
- B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
- B23Q1/01—Frames, beds, pillars or like members; Arrangement of ways
- B23Q1/012—Portals
-
- 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
- B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
- B23Q1/01—Frames, beds, pillars or like members; Arrangement of ways
- B23Q1/015—Frames, beds, pillars
Abstract
A kind of outline needs the flexible jig of the workpiece of milling, including base, mobile gantry device, positioner and control system；One cross slide way of upper following each installation of the base, the upper surface of the base is disposed with multiple mounting holes in length and breadth, the upper surface of the base is provided with the stopping means for spacing blank workpiece, and movement of the gantry frame structure along the cross slide way is controlled by gantry frame cylinder；The positioner include for depressing in the middle part of blank workpiece push positioner and it is multiple for depressing blank workpiece outline can angle positioning device；The releases of single or multiple positioners avoids cutter track in the movement of control system mobile gantry device according to the working motion TRAJECTORY CONTROL of cutter and the control positioner.The present invention proposes that a kind of outline needs the flexible jig of the workpiece of milling, improves processing efficiency, avoids the processing route of cutter, improves processing safety, and machining accuracy is high.
Description
Technical field
The present invention relates to clamping tool for machine work field, more particularly to a kind of outline to need the flexible jig of the workpiece of milling.
Background technology
The existing work pieces process for needing milling outline, generally require repeatedly artificial repeatedly assembly and disassembly workpiece briquetting, processing consumption
When it is longer, cost is high, and has been short of in processing safety, and the general surrounding for only pushing workpiece, to not having in the middle part of workpiece
Pressuring action, big workpiece, because vibrations caused by milling can be transferred to whole workpiece, prevent workpiece from smoothly being added in processing
Work, machining accuracy is not high, and its middle part of big workpiece that middle part does not have to compress easily bending occurs, causes work pieces process
Out-of-flatness afterwards, in addition, when tool sharpening forgets to tear open workpiece briquetting to the set outline region worker of workpiece, just occur and hit
Machine, easily fixture is damaged or worker is damaged, processing safety is low, and labor strength is big.
The content of the invention
It is an object of the invention to propose that a kind of outline needs the flexible jig of the workpiece of milling, processing efficiency is improved, is kept away
Allow the processing route of cutter, improve processing safety, machining accuracy is high.
To use following technical scheme up to this purpose, the present invention：
A kind of outline needs the flexible jig of the workpiece of milling, including base, mobile gantry device, positioner and control
System；
One cross slide way of upper following each installation of the base, the upper surface of the base are disposed with multiple the in length and breadth
One mounting hole, the upper surface of the base are provided with the stopping means for spacing blank workpiece, and the stopping means is according to institute
The outer contour shape for the blank workpiece that need to be processed is arranged at intervals on the base by the mounting hole；
The mobile gantry device includes two root posts, and the column is respectively symmetrically installed on the base by sliding block
The cross slide way on upper and lower both sides, connected by longitudinal fixed cross beam between the two root posts, the two root posts with it is described
Fixed cross beam forms gantry frame structure, and movement of the gantry frame structure along the cross slide way is by gantry frame cylinder control
System；
The positioner include for depressing in the middle part of blank workpiece push positioner and it is multiple for depressing blank
Workpiece outline can angle positioning device, the positioner that pushes is installed on the fixed cross beam, it is the multiple can corner
Positioner outer contour shape interval of the blank workpiece of processing needed for is installed on the base；
The movement and control of control system mobile gantry device according to the working motion TRAJECTORY CONTROL of cutter
The releases of single or multiple positioners avoids cutter track in the positioner.
Preferably, be not installed with stopping means or can the first mounting hole of angle positioning device be provided with for preventing scrap
Fall into hole and pull out plug.
Preferably, it is provided with the region that the multiple stopping means that the base is set surrounds for propping up blank work
The supporting plate of part.
Preferably, the stopping means is spacing backup plate or locating part, and the spacing backup plate is provided with to be born for spacing
The step of workpiece.
Preferably, the gantry frame cylinder is arranged at the upper following side of the base, the base it is upper following
Side be provided with and block deckle board for block that scrap falls into cylinder.
Preferably, the upper following side of the base is additionally provided with the Tibetan wire frame for protecting wiring.
Preferably, the fixed cross beam is arranged at intervals with multiple for installing second installation for pushing positioner
Hole.
Preferably, it is described can angle positioning device be swing clamp cylinder positioner.
Preferably, it is described push positioner and it is described can angle positioning device be provided with magnetic switch.
Preferably, the base be additionally provided with blank workpiece from corresponding spacer pin with holes.
Beneficial effects of the present invention：1st, all portion and middle part are carried out to workpiece pushes positioning, avoids workpiece from being shaken in processing
It is dynamic to shift, it is ensured that machining accuracy；2nd, the processing road of cutter to the independent control of positioner, is avoided by control system
Line, improve processing safety；3rd, it is effective avoid blank workpiece bend or deformation, it is ensured that stationarity during work pieces process
And the planarization after processing；4th, base has adjustability, suitable for the processing of different workpieces.
Brief description of the drawings
Fig. 1 is the structural representation of one embodiment of the present of invention；
Fig. 2 is the structural representation of one embodiment of the present of invention；
Fig. 3 is the structural representation of the blank workpiece of one embodiment of the present of invention；
Fig. 4 is the close-up schematic view of D parts in Fig. 1.
Wherein：Base 1, mobile gantry device 2, positioner 3, the first mounting hole 101, cross slide way 11, stopping means
12nd, supporting plate 13, block deckle board 14, hide wire frame 15, spacer pin 16, column 21, sliding block 22, fixed cross beam 23, gantry frame gas
Cylinder 24, push positioner 31, can angle positioning device 32, spacing backup plate 121, locating part 122, the second mounting hole 231, step
1211st, blank workpiece 01.
Embodiment
Further illustrate technical scheme below in conjunction with the accompanying drawings and by embodiment.
A kind of outline needs the flexible jig of the workpiece of milling, including base 1, mobile gantry device 2, the and of positioner 3
Control system；
One cross slide way 11 of upper following each installation of the base 1, the upper surface of the base 1 are disposed with more in length and breadth
Individual first mounting hole 101, the upper surface of the base 1 are provided with the stopping means 12 for spacing blank workpiece 01, the limit
Position device 12 is arranged at intervals at institute according to the outer contour shape of the blank workpiece 01 of required processing by first mounting hole 101
State on base 1；
The mobile gantry device 2 includes two root posts 21, and the column 21 is respectively symmetrically installed on institute by sliding block 22
The cross slide way 11 on the both sides up and down of base 1 is stated, is connected between the two root posts 21 by longitudinal fixed cross beam 23, it is described
Two root posts 21 and the fixed cross beam 23 form gantry frame structure, and the gantry frame structure is along the cross slide way 11
Movement is controlled by gantry frame cylinder 24；
The positioner 3 include for depressing the middle part of blank workpiece 01 push positioner 31 and it is multiple for depressing
The outline of blank workpiece 01 can angle positioning device 32, the positioner 31 that pushes is installed on the fixed cross beam 23, institute
State it is multiple can angle positioning device 32 base is installed on according to the outer contour shape interval of the blank workpiece 01 of required processing
1；
The movement and control of control system mobile gantry device 2 according to the working motion TRAJECTORY CONTROL of cutter
The releases of single or multiple positioners avoids cutter track in the positioner 3.
As shown in figure 1, outer contour shape spaced stopping means of the base 1 according to the blank workpiece 01 of required processing
12 form the groove position for placing workpiece, and the blank workpiece 01 for needing milling is positioned in the stopper slot position by worker, by can corner
Positioner 32 is compressed to the edge of blank workpiece 01, and gantry frame structure is controlled by gantry frame cylinder 24 and transversely led
Rail 11 is moved to the middle part of blank workpiece 01, and what is set in its frame structure pushes middle part of the positioner 31 to blank workpiece 01
Carry out pushing clamping, blank workpiece 01 is pressed in base 1, when cutter carries out milling to the outline of blank workpiece 01, work as knife
Tool is mobile when being worked into the region provided with positioner 3, and the positioner 3 in the region is under the cooperation control of control system to hair
Base workpiece 01, which unclamp, avoids cutter track.Blank workpiece as shown in Figure 3, dash area are the clout for needing milling to remove.
As shown in Fig. 2 when cutter is moved to machining area A or B, the region can angle positioning device 32 can release pair
Workpiece push and corner leaves the surface of blank workpiece 01, cutter is carried out milling, the region to the outline in the region
After completion of processing, can angle positioning device 32 blank workpiece 01 is compressed again, when cutter is prepared to enter into machining area C
When, push positioner 31 and release workpiece is pushed, gantry frame structure controls transversely guide rail by gantry frame cylinder 24
11 are moved to any side of base 1, realize the cutter track avoidance to machining area C, after machining area C is machined, gantry frame
Frame structure is moved to top in the middle part of workpiece again, and it pushes positioner 31 and workpiece is compressed.While realizing avoidance, other
The positioner 3 in region still has to blank workpiece 01 pushes pressuring action, avoids workpiece vibrations in processing from shifting, really
Machining accuracy is protected, compared to the existing Work-sheet pressing that repeatedly manually need to repeatedly assemble and disassemble workpiece briquetting and carry out, processing efficiency is significantly
Raising, reduce the labor intensity of worker, by the Fa Nake control systems of numerical control (NC) M code come the compression to positioner 3 with
Release action individually control, when machine tool is worked into workpiece set outline region, positioner 3 can automatic impaction or pine
Go into operation part, so as to avoid the processing route of cutter, avoids worker from forgetting to tear open workpiece briquetting so as to collide, easily to people and machine
Injury caused by bed, it is ensured that and improve processing safety.
The upper surface of base 1 is disposed with multiple first mounting holes 101 in length and breadth, and stopping means 12 is according to required processing
The outer contour shape of blank workpiece 01 is arranged at intervals on base 1 by the first mounting hole 101, makes this fixture can be according to not
Same workpiece is spacing to carry out, high suitable for different elongated workpieces, adjustability.Preferably, the size of the first mounting hole 101 is
1-5cm, the first mounting hole 101 is smaller, and the installation of stopping means 12 is more accurate, and the stopper slot formed is more coincident with the shape of workpiece
Shape.
In addition, the gantry frame structure for carrying and pushing positioner 31 is provided with, to carrying out pushing positioning in the middle part of workpiece,
If only carrying out positioning compression to workpiece by the edge of workpiece, during processing, cutter carries out workpiece caused by milling to workpiece and shaken
It is dynamic that vibration amplitude can greatly increase, and preventing workpiece, machining accuracy is not high from being smoothly processed when being transferred in the middle part of workpiece,
Additionally due to vibration amplitude becomes big, workpiece is easily set to bend or deform, therefore be provided with the middle part of for depressing workpiece and determine
Position device, can effectively avoid blank workpiece 01 bend or deformation, it is ensured that stationarity during work pieces process and add
Planarization after work.
In the description of the invention, it is to be understood that term " on ", " under ", "left", "right", " bottom ", " transverse direction ", " vertical
To " etc. instruction orientation or position relationship be based on orientation shown in the drawings or position relationship, be for only for ease of and describe this hair
It is bright and simplify description, rather than instruction or imply that signified device or element must have specific orientation, with specific orientation
Construction and operation, therefore be not considered as limiting the invention.
Preferably, be not installed with stopping means 12 or can the first mounting hole 101 of angle positioning device 32 be provided with and be used for
Prevent scrap is fallen into hole from pulling out plug.Be not installed with stopping means 12 or can angle positioning device 32 the first mounting hole
101, provided with that can pull out plug to block, have avoided scrap from falling into the first mounting hole 101, have made the cleaning of scrap simpler, can pull out
Plug can be selected rubber and be made.
Preferably, it is provided with the region that the multiple stopping means 12 that the base 1 is set surrounds for propping up hair
The supporting plate 13 of base workpiece 01.When blank workpiece 01 is placed into the stop zone of fixture, workpiece bottom is provided with supporting plate
13, workpiece is supportted from when in the surface of base 1, making the cutter be processed workpiece, the knife edge will not be applied directly to the table of base 1
Face, the surface smoothness of base 1 is kept, makes the more safety durable of base 1.
Preferably, the stopping means 12 is spacing backup plate 121 or locating part 122, and the spacing backup plate 121 is provided with use
In the spacing step 1211 for bearing workpiece.The spacing setting of backup plate 121 limited location bears the step 1211 of workpiece, with reference to supporting plate 13
Design is propped up to workpiece, the spacing backup plate 121 provided with the spacing step 1211 for bearing workpiece is also arranged at intervals in the edge of work,
Make the outline edge of workpiece by can when pushing positioning of angle positioning device 32, edge bottom is also equipped with relevant position
On the deformation for bearing step 1211, avoiding the edge of work.
Preferably, the gantry frame cylinder 24 is arranged at the upper following side of the base 1, the base 1 it is upper
Following side is provided with blocks deckle board 14 for block that scrap falls into cylinder.The top of gantry frame cylinder 24 is provided with screening
Deckle board 14 is kept off, effectively avoids scrap from dropping into cylinder, avoids scrap from influenceing the precision of cylinder movement.
Preferably, the upper following side of the base 1 is additionally provided with the Tibetan wire frame 15 for protecting wiring.It is provided with Tibetan
Wire frame 15 is used for the connecting line for protecting positioner 3, prevents from influenceing the life-span of reduction wiring because of falling into for scrap or peace be present
Full hidden danger.
Preferably, the fixed cross beam 23 is arranged at intervals with multiple for installing second peace for pushing positioner 31
Fill hole 231.Be arranged at intervals with multiple second mounting holes 231, push positioner 31 can according to the shape of blank workpiece 01 and
Machining attribute is selectively mounted on the diverse location of fixed cross beam 23, has an adjustable.
Preferably, it is described can angle positioning device 32 be swing clamp cylinder positioner.
Preferably, it is described push positioner 31 and it is described can angle positioning device 32 be provided with magnetic switch.Set
Be magnetic switch, when push positioner 31 and can angle positioning device 32 break down when, lathe can automatic alarm, notify work
People is checked fixture, improves safe operation coefficient.
Preferably, the base 1 be additionally provided with blank workpiece 01 from corresponding spacer pin 16 with holes.With a collection of blank
Its size of workpiece 01 generally there are certain deviation, therefore the stopping means 12 that base 1 is set simply substantially limits blank workpiece 01
The region of placement, for the possible blank workpiece 01 less than normal or marginal existence breach of some sizes, stopping means 12 can not
Play good position-limiting action, in blank workpiece 01 it is general all with predetermined distance from holes, therefore can be set on base 1
Have with, from corresponding spacer pin 16 with holes, as shown in figure 4, when placing blank workpiece 01, need to only be carried in blank workpiece 01
Hole correspondingly penetrates spacer pin 16 and blank workpiece 01 can be limited on base 1, avoids because of chi existing for blank workpiece 01 itself
Very little deviation or breach and cause the problem of spacing not accurate, it is ensured that and improve machining accuracy.
The technical principle of the present invention is described above in association with specific embodiment.These descriptions are intended merely to explain the present invention's
Principle, and limiting the scope of the invention can not be construed in any way.Based on explanation herein, the technology of this area
Personnel would not require any inventive effort the other embodiments that can associate the present invention, and these modes are fallen within
Within protection scope of the present invention.
Claims (8)
1. a kind of outline needs the flexible jig of the workpiece of milling, it is characterised in that：Including base, mobile gantry device, positioning
Device and control system；
One cross slide way of upper following each installation of the base, the upper surface of the base are disposed with multiple first peaces in length and breadth
Hole is filled, the upper surface of the base is provided with the stopping means for spacing blank workpiece, and the stopping means adds needed for
The outer contour shape of the blank workpiece of work is arranged at intervals on the base by first mounting hole；
The mobile gantry device includes two root posts, and the column is respectively symmetrically installed on the upper and lower of the base by sliding block
The cross slide way on both sides, pass through longitudinal fixed cross beam between the two root posts and connect, the two root posts and the fixation
Crossbeam forms gantry frame structure, and movement of the gantry frame structure along the cross slide way is controlled by gantry frame cylinder；
The positioner include for depressing in the middle part of blank workpiece push positioner and it is multiple for depressing blank workpiece
Outline can angle positioning device, the positioner that pushes is installed on the fixed cross beam, it is the multiple can corner positioning
Device outer contour shape interval of the blank workpiece of processing needed for is installed on the base；
Described in the control system movement and control of mobile gantry device according to the working motion TRAJECTORY CONTROL of cutter
The releases of single or multiple positioners avoids cutter track in positioner；
Be not installed with stopping means or can the first mounting hole of angle positioning device be provided with for preventing scrap from falling into hole
Plug can be pulled out；
The base be additionally provided with blank workpiece from corresponding spacer pin with holes.
2. a kind of outline according to claim 1 needs the flexible jig of the workpiece of milling, it is characterised in that：The base
The supporting plate for propping up blank workpiece is provided with the region that the multiple stopping means set surrounds.
3. a kind of outline according to claim 2 needs the flexible jig of the workpiece of milling, it is characterised in that：It is described spacing
Device is spacing backup plate or locating part, and the spacing backup plate is provided with for the spacing step for bearing workpiece.
4. a kind of outline according to claim 1 needs the flexible jig of the workpiece of milling, it is characterised in that：Described gantry
Framework cylinder is arranged at the upper following side of the base, and the upper following side of the base is provided with for blocking scrap
Fall into cylinder blocks deckle board.
5. a kind of outline according to claim 4 needs the flexible jig of the workpiece of milling, it is characterised in that：The base
Upper following side be additionally provided with Tibetan wire frame for protecting wiring.
6. a kind of outline according to claim 1 needs the flexible jig of the workpiece of milling, it is characterised in that：The fixation
Girder space is provided with multiple for installing second mounting hole for pushing positioner.
7. a kind of outline according to claim 1 needs the flexible jig of the workpiece of milling, it is characterised in that：It is described to turn
Angle positioner is swing clamp cylinder positioner.
8. a kind of outline according to claim 1 needs the flexible jig of the workpiece of milling, it is characterised in that：It is described to push
Positioner and it is described can angle positioning device be provided with magnetic switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510279931.4A CN104875045B (en) | 2015-05-27 | 2015-05-27 | A kind of outline needs the flexible jig of the workpiece of milling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510279931.4A CN104875045B (en) | 2015-05-27 | 2015-05-27 | A kind of outline needs the flexible jig of the workpiece of milling |
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| Publication Number | Publication Date |
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| CN104875045A CN104875045A (en) | 2015-09-02 |
| CN104875045B true CN104875045B (en) | 2017-11-21 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107900748A (en) * | 2017-12-18 | 2018-04-13 | 无锡优耐特能源科技有限公司 | A kind of limiting device |
| CN111390605A (en) * | 2020-03-30 | 2020-07-10 | 佛山市普拉迪数控科技有限公司 | Full-automatic tool clamp for machining battery tray |
| CN111408778A (en) * | 2020-04-15 | 2020-07-14 | 常州工学院 | Milling machine linkage clamp and control method thereof |
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| CN202447940U (en) * | 2012-03-02 | 2012-09-26 | 山东亚盛重工股份有限公司 | Support and positioning device for large flat workpiece |
| CN202593682U (en) * | 2012-04-06 | 2012-12-12 | 南车戚墅堰机车有限公司 | Hydraulic driving and pressing system for gantry |
| CN103934713A (en) * | 2014-05-05 | 2014-07-23 | 西北工业大学 | Needle type locating adjustable hydraulic type clamp for machining of tenon of precisely forged blade |
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| DE3234669A1 (en) * | 1982-09-18 | 1984-03-22 | Hubert Dipl.-Ing. 5920 Bad Berleburg Bald | Method and device for producing steel parts having at least two bores |
| CN101992398A (en) * | 2009-08-10 | 2011-03-30 | 上海后盾塑胶模具有限公司 | Workpiece fixture for multi-functional machine tool |
| CN201500900U (en) * | 2009-09-16 | 2010-06-09 | 沈阳晨讯希姆通科技有限公司 | fixture |
| CN101913094B (en) * | 2010-08-17 | 2012-01-04 | 沈阳飞机工业（集团）有限公司 | Multifunctional foundation plate connected with worktable of numerical control machine |
| CN202607343U (en) * | 2012-05-31 | 2012-12-19 | 成都飞机工业（集团）有限责任公司 | Compressing tooling for plate-type structural member |
| CN203542436U (en) * | 2013-11-08 | 2014-04-16 | 武汉凡谷自动化有限公司 | Universal fixture |
| CN104084814B (en) * | 2014-07-01 | 2017-03-22 | 东方电气集团东方汽轮机有限公司 | Quick clamping and alignment method and fixture for milling arc segments of stationary blade grid |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202447940U (en) * | 2012-03-02 | 2012-09-26 | 山东亚盛重工股份有限公司 | Support and positioning device for large flat workpiece |
| CN202593682U (en) * | 2012-04-06 | 2012-12-12 | 南车戚墅堰机车有限公司 | Hydraulic driving and pressing system for gantry |
| CN103934713A (en) * | 2014-05-05 | 2014-07-23 | 西北工业大学 | Needle type locating adjustable hydraulic type clamp for machining of tenon of precisely forged blade |
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Effective date of registration: 20190612 Address after: 213000 No. 99 Tongda Road, Luoxi Town, Xinbei District, Changzhou City, Jiangsu Province Patentee after: Jiangsu Prudy CNC Technology Co., Ltd. Address before: 528137 No. 70 Sanshui Center Industrial Park, Foshan City, Guangdong Province Patentee before: Foshan Pratic CNC Science & Technology Co., Ltd. |