CN106826287A - A kind of clamp assembly for clamping square cross - Google Patents
A kind of clamp assembly for clamping square cross Download PDFInfo
- Publication number
- CN106826287A CN106826287A CN201710121466.0A CN201710121466A CN106826287A CN 106826287 A CN106826287 A CN 106826287A CN 201710121466 A CN201710121466 A CN 201710121466A CN 106826287 A CN106826287 A CN 106826287A
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- Prior art keywords
- clamping
- grip block
- workpiece
- spring
- block
- Prior art date
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- 238000000034 method Methods 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000003801 milling Methods 0.000 claims description 6
- 210000003746 Feathers Anatomy 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 2
- 230000001737 promoting Effects 0.000 claims description 2
- 210000001847 Jaw Anatomy 0.000 description 4
- 238000011112 process operation Methods 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000010923 batch production Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
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
Abstract
A kind of clamp assembly for clamping square cross, including clamp assembly（3）, it is characterised in that：The clamp assembly（3）Including housing（31）, the housing（31）Middle part is provided with can be in relatively close and relative two grip blocks for deviating from of left and right directions：Left grip block（42）With right grip block（41）, in the left grip block（42）Bottom right extended spot and the housing（3）Between, the right grip block（41）Lower-left stretch out place with institute's housing（3）Between be respectively arranged with left spring（421）With right spring（411）.
Description
Technical field
The application is related to machine-building to equip field, specially a kind of clamp assembly for clamping square cross.
Background technology
CNC milling machine can be wide with processing technology scope, and precision is higher, so using more and more wider.But current processing object is
The workpiece of processing is generally the rectangle or cylindrical work of regular shape.It is much stronger using versatility when rectangular piece is processed
Flat-nose pliers clamping workpiece, in batch production, because workpiece scale error in itself or blank dimension are in the same size, is changing work
Needed during part again to knife to determine the origin of workpiece coordinate system, so as to cause during processing, non-cutting time is long, and processing efficiency is received
To certain influence.
The content of the invention
It is an object of the invention to provide a kind of clamp assembly for clamping square cross, it can overcome in the prior art
Aftermentioned defect.
A kind of clamp assembly for clamping square cross of the invention, including clamp assembly, it is characterised in that：Institute
Stating clamp assembly includes housing, and the housing central section is provided with can be in relatively close and relative two clampings for deviating from of left and right directions
Block：Left grip block and right grip block, between the bottom right extended spot and the housing of the left grip block, the right grip block
Lower-left is stretched out and left spring and right spring is respectively arranged between place and institute's housing, in the left side of the left grip block and the right folder
Hold and one is each provided with the right side of block can go up the left wedge block and right wedge block of downslide, the left wedge block and the left grip block it
Between and the right wedge block and the right grip block between be in contact with inclined-plane, under the left wedge block and the right wedge block
End face is provided with inclined-plane, and the inclined-plane holds out against portion and the right inclined-plane held out against above portion and connects with clamp bracket both sides with a gradient left side
Touch, the upper end of the left wedge block and right wedge block be each provided with a spring, between the left grip block and right grip block
Middle part be provided with one be fixedly connected with the lifting screw for extending downward and through housing central section boss be used to determine the workpiece
Above-below direction position is taken over a business, and the lifting screw sets the axial elongated slot of one and anti-rotation teeth portion phase wedging, under lifting screw
Portion is provided with a nut, and the nut is integrally fixed with the worm gear in the Worm Wheel System being made up of worm gear and worm shaft,
The worm shaft fore-and-aft direction is installed and is erected at the front-rear side walls of the housing, and the clamp bracket holds out against portion, the right side including a left side
Hold out against portion and the connection left side to hold out against portion and the right side and hold out against the pushing part in portion, the pushing part middle part is provided with one with folder
The screw that the lines of the push rod front portion of jacking motor is mutually screwed is held, between the front inner wall of the housing and the pushing part
The driving pulley that a clutch and a lifting transmission belt are connected with installed in drive pulley on the worm shaft is provided with push rod,
One is additionally provided with the top of the left grip block is used to install the through hole of centering component of fore-and-aft direction centering, the centering component
Including shape L-shaped fore-stock and after-poppet, the fore-stock includes columned preceding guide part and front clamp portion, described
The end of preceding guide part sets a back bevel, two is provided with the inside of front clamp portion and is contacted with workpiece leading flank in clamping
On roller, the annulus before the preceding guide part is provided with the back bevel, the preceding annulus and the left grip block
Through hole between a front stretching spring is installed, it is anterior with through hole on left clamping part that preceding guide part is provided with one at front clamp portion
Axial straight trough slips the feather key of cooperation, and the after-poppet includes columned rear guide part and rear clamping part, the rear guiding
The end in portion sets a front bevel, and two rollers contacted with workpiece leading flank in clamping are provided with the inside of rear clamping part,
Through hole on annulus after guide part is provided with the front bevel in the rear, the rear annulus and the left grip block
Between install one after adjustable spring, it is anterior with through hole on left clamping part axially straight that rear guide part is provided with one at the rear clamping part
Groove slips the feather key of cooperation, and the ejector pin that a both sides are arranged to inclined-plane is provided between the front bevel and back bevel, described
Ejector pin right-hand member stretches out the work department of left grip block, and left end is provided with a centering spring, when the left grip block and the right clamping
Block is relatively close and during clamping workpiece, the workpiece is first contacted with the ejector pin, during progressively clamping, the ejector pin quilt
Head into the left grip block, meanwhile, the preceding guide part and rear guide part are respectively in the front stretching spring and rear flexible bullet
The front clamp portion and the rear clamping part realize centering positioning before and after the workpiece to medial movement in the presence of spring.
Further technical scheme, conveyer belt is provided with for conveying completion of processing workpiece in the clamp assembly right
Chute feeder, clamp assembly left side is provided with storagetank, positioned at storagetank top be provided with for promote workpiece point
Material pushing meanss, workpiece is processed after positioning clamping in the clamp assembly on vertical numerical control milling machine, after completion of processing
Workpiece is seen off to required next website by the chute feeder.
Further technical scheme, when the clamping jacking motor drives the pushing part to medial movement, the left wedge
Tight block and right wedge block are moved up, so as to promote the left grip block and right grip block is relatively close and clamping workpiece, work as institute
When stating clamping jacking motor and driving the outside side shifting in the pushing part, the left voussoir and right wedge block are in the spring and spring
In the presence of move down, meanwhile, the left grip block and the right grip block are respectively in the left spring and the right spring
In the presence of relative deviating from and unclamp workpiece.
Further technical scheme, when the clutch is engaged with driving pulley, promotes described by lifting transmission belt
Worm shaft rotates, and then drives the worm gear to rotate, and the lifting screw produces the action of lifting and makes workpiece in above-below direction
Realize positioning.
By the present invention, the automatic centering around workpiece can be made to be realized in clamping process in both direction, it is ensured that
Only needed once to knife when workpiece is processed on CNC milling machine in batch.The grip block sliding due to being provided with energy left and right, by clamping branch
Frame it is movable, make left grip block and right grip block it is synchronously relatively close and while realize the centering of left and right directions and position
The clamping to workpiece is realized, simultaneously as there is provided the spring of left and right spring and wedge block upper end, makes two grip blocks of left and right exist
Reliable operation when deviating from opposite directions；Due to be provided with centering component, in left and right grip block it is relatively close and during clamping workpiece,
Ejector pin is pressed into left grip block and makes fore-stock and after-poppet while pressing to workpiece by the workpiece, so that workpiece is in fore-and-aft direction
Also self-centering function is realized；Due to being provided with lifting screw, workpiece can be risen into required position before clamping, made
Workpiece top surface rises from the certain height of left and right grip block top surface, prevent in process jaw by cutter institute mill off, additionally,
Lifting screw can also be used to workpiece is ejected into jaw after work pieces process is complete, in order under the promotion of sub-material pushing meanss by work
Part pushes chute feeder；Due to being provided with clutch, two actions of clamping and jacking are completed by clamping jacking motor, reduce electricity
Machine quantity, reduces manufacturing cost.Whole equipment structure is relatively simple, and stabilized structure, cost is relatively low, reliable, can replace
For manual maintenance, drawing-in type cleaning dedusting is carried out for controller cabinet, it is ensured that the normal operation of controller cabinet；Square can not only be realized
Shape workpiece around in both direction to middle positioning, reduce the non-cutting time of process operation, and realize workpiece
Top surface stretches out the control of grip block distance, it is ensured that the security of process operation.
Brief description of the drawings
Fig. 1 is the integrated model schematic diagram of the clamp assembly for clamping square cross of the invention；
Fig. 2 is the front view of the clamp assembly in Fig. 1；
Fig. 3 is the top view of the clamp assembly in Fig. 1；
Fig. 4 is the enlarged diagram of the centering component in Fig. 3.
Specific embodiment
Above in conjunction with Fig. 1-4, the present invention is described in detail.
According to a kind of clamp assembly for clamping square cross of embodiment, including clamp assembly 3, it is characterised in that：
The clamp assembly 3 includes housing 31, and the middle part of the housing 31 is provided with and can be relatively close in left and right directions and relative deviates from
Two grip blocks：Left grip block 42 and right grip block 41, the left grip block 42 bottom right extended spot and the housing 3 it
Between, the lower-left of the right grip block 41 stretch out and left spring 421 and right spring 411 be respectively arranged between place and institute's housing 3, in institute
The right side in the left side and the right grip block 41 of stating left grip block 42 is each provided with one and can go up the left wedge block 52 and right wedge of downslide
Tight block 51, between the left wedge block 52 and the left grip block 42 and between the right wedge block 51 and the right grip block 41
It is in contact with inclined-plane, the lower surface of the left wedge block 52 and the right wedge block 51 is provided with inclined-plane, the inclined-plane and clamping
The both sides of support 60 hold out against portion 62 and the right inclined-plane held out against above portion 61 and are in contact with a gradient left side, the left wedge block 52 and right wedging
The upper end of block 51 is each provided with a spring 521,511, and the middle part between the left grip block 42 and right grip block 41 is provided with
One be fixedly connected with the lifting screw 83 for extending downward and through housing central section boss be used to determine the workpiece above-below direction
Position takes over a business 80, and the lifting screw 83 sets the axial elongated slot 86 of one and the phase wedging of anti-rotation teeth portion 85, lifting screw 83
Bottom is provided with a nut 84, the worm gear 81 in the nut 84 and the Worm Wheel System being made up of worm gear 81 and worm shaft 82
It is integrally fixed, the fore-and-aft direction of the worm shaft 82 is installed and is erected at the front-rear side walls of the housing 31, the clamp bracket
60 include that a left side holds out against portion 62, right portion 61 and the connection left side of holding out against and holds out against portion 62 and the right side and hold out against the pushing part 63 in portion 61,
The middle part of the pushing part 63 is provided with a screw mutually screwed with the lines of the front portion of push rod 90 of clamping jacking motor 9, described
A clutch 91 and a lifting transmission belt 92 are provided with push rod 90 between the front inner wall of housing 31 and the pushing part 63
The driving pulley 921 being connected with the drive pulley 922 on the worm shaft 82, the top of the left grip block 42 also sets up
Having one is used to install the through hole of centering component of fore-and-aft direction centering, and the centering component includes the L-shaped fore-stock of shape
And after-poppet, the fore-stock include columned preceding guide part 71 and front clamp portion 711, the end of the preceding guide part 71 sets
A back bevel 715 is put, the inner side in front clamp portion 711 is provided with two rollers 730 contacted with workpiece leading flank in clamping,
The preceding guide part 71 is close to annulus 714, the preceding annulus 714 and the left clamping before being provided with one at the back bevel 715
One front stretching spring 713 is installed, preceding guide part 71 is provided with one with left folder at front clamp portion 711 between the through hole on block 42
The sliding feather key 712 for coordinating of anterior axial direction straight trough 422 of through hole in portion 42 is held, the after-poppet includes columned rear guide part
72 and rear clamping part 721, the end of the rear guide part 72 sets a front bevel 725, and the inner side of rear clamping part 721 is provided with two
The individual roller 730 contacted with workpiece leading flank in clamping, is provided with the close front bevel 725 of guide part 72 in the rear
Annulus 724 after one, between the through hole on the rear annulus 724 and the left grip block 42 install one after adjustable spring 723, after lead
One is provided with rear clamping part 721 to portion 72 and slips leading for cooperation with the anterior axial direction straight trough 424 of through hole on left clamping part 42
To key 722, the ejector pin 70 that a both sides are arranged to inclined-plane, the ejector pin are installed between the front bevel 725 and back bevel 715
70 right-hand members stretch out the work department of left grip block, and left end is provided with a centering spring 73, when the left grip block 42 and the right folder
Hold that block 41 is relatively close and during clamping workpiece, the workpiece is first contacted with the ejector pin 70, described during progressively clamping
Ejector pin 70 is headed into the left grip block 42, meanwhile, the preceding guide part 71 and rear guide part 72 are respectively in the front stretching
In the presence of spring 713 and rear adjustable spring 723 the front clamp portion 711 and the rear clamping part 721 to medial movement reality
Centering positioning before and after the existing workpiece.
Wherein, conveyer belt is installed for conveying the chute feeder 2 of completion of processing workpiece in the right of the clamp assembly 3,
The left side of the clamp assembly 3 is provided with storagetank 10, is provided with for promoting the sub-material of workpiece to push away positioned at the top of the storagetank 10
Dynamic device 11, workpiece is processed after positioning clamping in the clamp assembly 3 on vertical numerical control milling machine, after completion of processing by
The chute feeder 2 sees to required next website workpiece off.
Wherein, when the clamping jacking motor 9 drives the pushing part 63 to medial movement, the left wedge block 52 and the right side
Wedge block 51 is moved up, so that promote the left grip block 42 and right grip block 41 is relatively close and clamping workpiece, when described
When clamping jacking motor 9 drives the 63 outside side shifting of pushing part, the left voussoir 52 and right wedge block 51 are in the spring
521 and spring 511 in the presence of move down, meanwhile, the left grip block 42 and the right grip block 41 are respectively on the left side
Deviate from relatively in the presence of spring 421 and the right spring 411 and unclamp workpiece.
Wherein, when the clutch 91 is engaged with driving pulley 921, the worm shaft is promoted by lifting transmission belt 92
82 rotations, then drive the worm gear 81 to rotate, and the lifting screw 83 produces the action of lifting and makes workpiece in above-below direction
Realize positioning.
The clamping jacking motor can be stepper motor, or AC servo motor.
The present apparatus can make automatic centering of the workpiece in both direction around realization in clamping process, it is ensured that in batch
Workpiece is only needed once to knife when being processed on CNC milling machine.
The grip block sliding due to being provided with energy left and right, by the movable of clamp bracket, makes left grip block and right clamping
Block is synchronously relatively close and realize and clamping to workpiece realized while the centering of left and right directions is positioned, simultaneously as setting
The spring of left and right spring and wedge block upper end, make two grip blocks of left and right it is opposite away from when reliable operation.
Due to being provided with centering component, in left and right grip block it is relatively close and during clamping workpiece, the workpiece will
Ejector pin is pressed into left grip block and makes fore-stock and after-poppet while pressing to workpiece, so that workpiece is also realized automatically in fore-and-aft direction
Centering function.
Due to being provided with lifting screw, workpiece can be risen into required position before clamping, make workpiece top surface liter
Go out the certain height of left and right grip block top surface, prevent in process jaw by cutter institute mill off, additionally, lifting screw is also
Can be used to after work pieces process is complete for workpiece to eject jaw, in order to workpiece is pushed into feeding under the promotion of sub-material pushing meanss
Groove.
Due to being provided with clutch, two actions of clamping and jacking are completed by clamping jacking motor, reduce motor number
Amount, reduces manufacturing cost.Whole equipment structure is relatively simple, and stabilized structure, cost is relatively low, reliable, can substitute people
Work safeguards that carrying out drawing-in type for controller cabinet clears up dedusting, it is ensured that the normal operation of controller cabinet；Rectangle work can not only be realized
Part around in both direction to middle positioning, reduce the non-cutting time of process operation, and realize workpiece top surface
Stretch out the control of grip block distance, it is ensured that the security of process operation.
By later mode, those skilled in the art can make various according to mode of operation within the scope of the invention
Change.
Claims (4)
1. a kind of clamp assembly for clamping square cross, including clamp assembly（3）, it is characterised in that：Clamp assembly（3）Bag
Include housing（31）, housing（31）Middle part is provided with can be in relatively close and relative two grip blocks for deviating from of left and right directions：Zuo Jia
Hold block（42）With right grip block（41）, in left grip block（42）Bottom right extended spot and housing（3）Between, right grip block（41）'s
Place and institute's housing are stretched out in lower-left（3）Between be respectively arranged with left spring（421）With right spring（411）, in left grip block（42）'s
Left side and right grip block（41）Right side be each provided with one and can go up the left wedge block of downslide（52）With right wedge block（51）, left wedging
Block（52）With left grip block（42）Between and right wedge block（51）With right grip block（41）Between be in contact with inclined-plane, left wedge block
（52）With right wedge block（51）Lower surface be provided with inclined-plane, inclined-plane and clamp bracket（60）A both sides band gradient left side holds out against portion（62）
Portion is held out against with the right side（61）Inclined-plane above is in contact, left wedge block（52）With right wedge block（51）Upper end be each provided with a spring
（521、511）, in left grip block（42）With right grip block（41）Between middle part be provided with one with extend downward and through housing
The lifting screw of middle part boss（83）Being used to of being fixedly connected determines taking over a business for workpiece above-below direction position（80）, lifting screw
（83）One is set with anti-rotation teeth portion（85）The axial elongated slot of phase wedging（86）, lifting screw（83）Bottom be provided with a nut
（84）, nut（84）With by worm gear（81）And worm shaft（82）Worm gear in the Worm Wheel System of composition（81）It is fixed into one
Body, worm shaft（82）Fore-and-aft direction is installed and is erected at housing（31）Front-rear side walls, clamp bracket（60）Portion is held out against including a left side
（62）, the right side hold out against portion（61）And a connection left side holds out against portion（62）Portion is held out against with the right side（61）Pushing part（63）, pushing part（63）In
Portion is provided with one with clamping jacking motor（9）Push rod（90）The screw that anterior lines is mutually screwed, housing（31）Front portion
Inwall and pushing part（63）Between push rod（90）On be provided with a clutch（91）With a lifting transmission belt（92）Be arranged on
Worm shaft（82）Upper drive pulley（922）The driving pulley of connection（921）, left grip block（42）Top be additionally provided with one and be used for
The through hole of the centering component of fore-and-aft direction centering is installed, centering component includes the L-shaped fore-stock and after-poppet of shape, preceding branch
Frame includes columned preceding guide part（71）With front clamp portion（711）, preceding guide part（71）End set a back bevel
（715）, front clamp portion（711）Inner side be provided with two rollers for being contacted with workpiece leading flank in clamping（730）, leading
To portion（71）Near back bevel（715）Place be provided with one before annulus（714）, preceding annulus（714）With left grip block（42）On it is logical
One front stretching spring is installed between hole（713）, preceding guide part（71）Near front clamp portion（711）Place is provided with one with left clamping part
（42）The anterior axial direction straight trough of upper through hole（422）The sliding feather key for coordinating（712）, after-poppet include columned rear guide part
（72）With rear clamping part（721）, rear guide part（72）End set a front bevel（725）, rear clamping part（721）Inner side set
It is equipped with two rollers contacted with workpiece leading flank in clamping（730）, in rear guide part（72）Near front bevel（725）Place sets
Annulus after being equipped with one（724）, rear annulus（724）With left grip block（42）On through hole between install one after adjustable spring（723）,
Guide part afterwards（72）Near rear clamping part（721）Place is provided with one with left clamping part（42）The anterior axial direction straight trough of upper through hole（424）
The sliding feather key for coordinating（722）, in front bevel（725）And back bevel（715）Between a both sides be installed be arranged to inclined-plane
Ejector pin（70）, ejector pin（70）Right-hand member stretches out the work department of left grip block, and left end is provided with a centering spring（73）, when left grip block
（42）With right grip block（41）During relatively close and clamping workpiece, workpiece elder generation and ejector pin（70）Contact, in the process for progressively clamping
In, ejector pin（70）Headed into left grip block（42）It is interior, meanwhile, preceding guide part（71）With rear guide part（72）Respectively in front stretching bullet
Spring（713）With rear adjustable spring（723）In the presence of front clamp portion（711）With rear clamping part（721）Realized to medial movement
Centering positioning before and after workpiece.
2. a kind of clamp assembly for clamping square cross according to claim 1, it is characterised in that：In the fixture
Component（3）Right is provided with conveyer belt for conveying the chute feeder of completion of processing workpiece（2）, the clamp assembly（3）Left side
It is provided with storagetank（10）, positioned at the storagetank（10）Top is provided with the sub-material pushing meanss for promoting workpiece（11）, work
Part is in the clamp assembly（3）It is processed on vertical numerical control milling machine after middle positioning clamping, by the feeding after completion of processing
Groove（2）Workpiece is seen off to required next website.
3. a kind of clamp assembly for clamping square cross according to claim 1, it is characterised in that：The clamping top
Lifting motor（9）Drive the pushing part（63）During to medial movement, the left wedge block（52）With right wedge block（51）Move upwards
It is dynamic, so as to promote the left grip block（42）With right grip block（41）Relatively close and clamping workpiece, when the clamping jacking electricity
Machine（9）Drive the pushing part（63）During outside side shifting, the left voussoir（52）With right wedge block（51）In the spring
（521）And spring（511）In the presence of move down, meanwhile, the left grip block（42）With the right grip block（41）Respectively
In the left spring（421）With the right spring（411）In the presence of relative deviating from and unclamp workpiece.
4. a kind of clamp assembly for clamping square cross according to claim 1, it is characterised in that：When the clutch
Device（91）With driving pulley（921）During engagement, by lifting transmission belt（92）Promote the worm shaft（82）Rotation, then drives
The worm gear（81）Rotation, the lifting screw（83）Produce the action of lifting and make workpiece realize positioning in above-below direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710121466.0A CN106826287B (en) | 2017-03-02 | 2017-03-02 | A kind of clamp assembly for clamping square cross |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710121466.0A CN106826287B (en) | 2017-03-02 | 2017-03-02 | A kind of clamp assembly for clamping square cross |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106826287A true CN106826287A (en) | 2017-06-13 |
| CN106826287B CN106826287B (en) | 2018-12-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710121466.0A Active CN106826287B (en) | 2017-03-02 | 2017-03-02 | A kind of clamp assembly for clamping square cross |
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| DE4135490C1 (en) * | 1991-10-28 | 1993-01-14 | Sma Sondermaschinen- Und Werkzeugbau Haldensleben Gmbh, O-3240 Haldensleben, De | Hydraulic tool or workpiece chuck, or support - has holding piston rod axially slidable in clamping piston centre bore |
| JP2002372010A (en) * | 2001-06-18 | 2002-12-26 | Toshiba Mach Co Ltd | Collet clamp device |
| CN101204778A (en) * | 2006-12-14 | 2008-06-25 | 厄罗瓦公司 | Workpiece holder for exact positioning on a clamping chuck and clamping device with a chuck and workpiece holder positioned exactly thereon |
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