CN104690603A - Milling machine dual-functional clamp - Google Patents
Milling machine dual-functional clamp Download PDFInfo
- Publication number
- CN104690603A CN104690603A CN201510111826.XA CN201510111826A CN104690603A CN 104690603 A CN104690603 A CN 104690603A CN 201510111826 A CN201510111826 A CN 201510111826A CN 104690603 A CN104690603 A CN 104690603A
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- China
- Prior art keywords
- casing
- alignment pin
- milling machine
- fixture
- difunctional
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Classifications
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- 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
- B23Q16/00—Equipment for precise positioning of tool or work into particular locations not otherwise provided for
- B23Q16/02—Indexing equipment
- B23Q16/04—Indexing equipment having intermediate members, e.g. pawls, for locking the relatively movable parts in the indexed position
- B23Q16/06—Rotary indexing
-
- 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
- B23Q1/25—Movable or adjustable work or tool supports
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jigs For Machine Tools (AREA)
Abstract
The invention discloses a milling machine dual-functional clamp. The milling machine dual-functional clamp has an indexing function and a certain clamping function. A T-shaped groove and a chuck positioning limit opening are arranged in a working table and a chuck and a workpiece clamping member are respectively mounted according to different workpieces to be machined. The chuck is mainly used for polyhedron and divided hole pitch machining. The clamping member is used for multi-workpiece clamping one-time machining of shear plate type workpieces. The positioning limit opening connected with a spindle and a plurality of layers of dividing tapered holes are closely matched with a positioning pin fixed to a body to achieve the purposes of working table indexing and fixing. The positioning is fixed to the T-shaped groove of the body through a nut and is moved along the T-shaped groove to the circles of different tapered holes according to the machining needs. A pair of angular contact bearing and ball bearing is mounted on the spindle of the clamp and firmly fixed to the body through bearing glands and retaining nuts. When the surface of the working table is needed to be turned, an operating handle is slightly pressed by the left hand, the surface of the working table is turned by the right hand, and the position pin easily springs into the next tapered hole under the action of the spring force.
Description
Technical field
The present invention be a kind of be applicable to all size model universal milling machine calibration and to the difunctional fixture cutting plate type part more than one piece clamping time processing.
Background technology
As the machining operation of device fabrication, in the production process in the face of many equipment workpieces, milling machine operator can run into the repeatedly replacing between dividing head and flat-nose pliers within one day, especially to ring flange, the brill Milling Machining of the disk like members body halving hole distances such as oil cylinder cover, the end mill head of universal milling machine and dividing head all should adjust 45° angle and could process, the result done like this, one is that general dividing head calibration is slower, in the face of small lot, single-piece clamping processing workpiece time its inefficiency, two are the increase in operator's more adjustment non-cutting time, and the dividing head after restoring to the original state is difficult to ensure the parallel of horizontal plane, need centering again.When flat-nose pliers clamping workpiece, some clamping difficult problems can be run into equally, operator in the face of One's name is legion, differ in size shear series products processing more aobvious unable to do what one wishes, not parallel because of shear series products not only out of plumb, flat-nose pliers mostly can not firm grip, process if workpiece is fitted on milling machine table face, find backing plate, centering, press-fit and all can bring inconvenience to operator.In a word, the frequent replacing of fixture and angle constantly adjust and reduce efficiency, add labour intensity to operator simultaneously.
Summary of the invention
According to the practical difficulty that processing and the shear series products machining of the above disc-like product halving hole distance run into, the invention provides the difunctional fixture that a kind of universal milling machine uses.
The technical solution used in the present invention is as follows:
The difunctional fixture of a kind of milling machine, comprise casing, rotating workbench and main shaft, described main shaft is a T-shaped main shaft, and the vertical portion of T-shaped main shaft is arranged in casing, and passes through bearing fit between casing; The horizontal component of T-shaped main shaft is exposed to outside casing, is fixedly connected with described workbench, and described workbench can rotate along with the rotation of main shaft; At described workbench, the cramping body for clamping shear series products or the chuck for fixedly mounting disc-like product are installed, the bottom of workbench is provided with the bellmouth of the different deciles of two circles, described bellmouth be fixed on the Last alignment pin of casing and closely cooperate and reach worktable rotary and fixing object.
The bellmouth of the described different decile of two circles refers to and comprises two circle bellmouths, and each circle bellmouth is decile, but the decile value of two circle bellmouths is different.
The cramping body of described shear series products is arranged on rotating work top by locating slot and T-slot, it comprises two parts symmetrical relative to main-shaft axis, every part comprises cramping body support, cramping body support is horizontally installed with clamping movable block, vertically rotating threaded shaft is installed, arbitrarily widen according to the large I of work piece body or reduce the distance between cramping body two parts, cramping body has pinching function, to the size shear part practicable more than one piece clamping time processing that there is some difference, working (machining) efficiency more than 6 times can be improved, 45 ° of chamfer machining can be carried out simultaneously.
The work top of described rotation there is the chuck coaxial with main shaft seam is installed, according to the needs of workpiece body, between cramping body and chuck, carry out quick-replaceable installation; The bottom surface of workbench is processed with the positioning spigot be connected with main shaft, and the periphery of seam is processed with the conical bore of the different decile of two circles, and conical bore and the alignment pin be fixed on casing closely cooperate and reach worktable rotary and fixing object.
The spindle end be connected with workbench is equipped with angular contact bearing, and tail end is equipped with ball bearing, is firmly fixed on casing by bearing gland, bearing inner race spacer and anti-return nut, the good axial float limiting main shaft.
Described casing side is provided with the step be integrated with it, described step is provided with a groove passed for alignment pin, the outer cover clamp nut of described alignment pin is firmly fixed in the step groove of casing, when needing adjustment, unclamp clamp nut, alignment pin can arbitrarily slide along the step groove of casing and then enter in the dowel hole of point circles such as difference, only need by tight for the clamp nut back of the body during work., when needing adjustment, unclamp clamp nut, alignment pin arbitrarily can slip in different decile circles along the step groove of casing, only need by tight for the clamp nut back of the body during work; The tail end of alignment pin is processed with the square body of 10 × 10 and coordinates with the elongated slot of operating grip and be connected, when workbench needs rotational angle, leftward while flicking operating grip, right hand rotation work top, alignment pin springs in next bellmouth under spring force.
The calibration number of degrees of described difunctional fixture are respectively: 45 °, 60 °, 90 °, 120 ° or 180 °.
Described bellmouth is bushing formula bellmouth, forms with alignment pin match grinding.
Described alignment pin is arranged on casing 45 ° of directions place, i.e. operator front and workbench X-axis angle direction at 45 ° place.Be characterized in that alignment pin Internal and external cycle is easy to adjust, quick, bellmouth is arranged in the bottom surface of workbench, and object is compression clamp height, convenient operation, leaves larger lifting space to milling machine table.
The operating grip of described fixture is lever, is characterized in laborsaving, quick, within each index time can be controlled in 3 seconds.
Described shear class piece-holder body, is through practical improvement for many years and forms, have easy, quick, clamping is firm, the range of work is wide, efficiency high, solves the problem of shear like members body difficulty clamping, inefficiency for many years.
This fixture power and energy facilitates rapidly, dismantles chuck install to can be controlled within 1 minute and complete from cramping body.
Positioning datum when described Workpiece fixing body is shear like members body more than one piece clamping.
Described operating grip is lever-type, and its one end is free end, and the other end is fixed on the step of casing side by a screw.
The surface cover that described alignment pin matches with step groove is equipped with a spring, and is set with an alignment pin overcoat in spring outer ring, and described alignment pin overcoat coordinates with the inner surface of step groove.
The major function that the present invention possesses:
1. shear like members body more than one piece clamping can be carried out time processing in shear class piece-holder body, overcome cut plate type part not only not parallel but also out of plumb bring the difficult problem being difficult to clamping processing to universal fixturing, compare with former processing method and can improve working (machining) efficiency 6 times.
2. shear class piece-holder body can use by clamping on fixture table top, also can be contained in separately on milling machine table face and use, and clamping can carry out 45 ° of chamfer machining to workpiece on fixture table top simultaneously.
3. this fixture is after loading scroll chuck, can carry out gengon rotate processing to pipe joint series products.
4. this fixture is particularly good at the processing of disk like members body halving hole distance, overcomes milling machine end mill head and dividing head adjusts the drawback that angle processes halving hole distance, and each index time controlled within 3 seconds.
5. the present invention is through the Application and improvement of nearly one-year age, and result of use is remarkable, the advantages such as it has firm grip, raises the efficiency, complete function, reduction operator labour intensity.
Accompanying drawing explanation
Fig. 1 is profile of the present invention;
Fig. 2 is shear class piece-holder body profile;
Fig. 3 is this fixture processing shear product structure schematic diagram;
Fig. 4 is that this fixture processing disc-like halving hole is apart from structural representation;
In figure: 1. rotary screw, 2. clamp fixed head, 3. clamp movable block, 4. clamp nut, 5. cramping body support, 6. Workpiece fixing body, 7. scroll chuck, 8. main shaft, 9. the fastening screw of chuck, 10. workbench, 11. alignment pins, 12. alignment pin overcoats, 13. clamp nuts, 14. springs, 15. operating grip hold-down screws, 16. operating grips, 17. casings, 18. bearing glands, 19. anti-return nuts, 20. ball bearings, 21. bearing inner race spacers, 22. angular contact bearings, 23. bearing glands, 24. clamping body set bolts, 25. sheet workpieces, 26. disc-like workpiece.
Detailed description of the invention
Below in conjunction with accompanying drawing and example, the present invention is further described.
As shown in Figure 1-2, the difunctional fixture of a kind of milling machine, comprises casing 17, rotating workbench 10 and main shaft 8, and described main shaft 8 is a T-shaped main shaft, and the vertical portion of T-shaped main shaft is arranged in casing 17, and passes through bearing fit between casing 17; The horizontal component of T-shaped main shaft is exposed to outside casing, is fixedly connected with described workbench 10, and described workbench 10 can rotate along with the rotation of main shaft 8; At described workbench 10, the cramping body for clamping shear series products or the scroll chuck 7 for fixedly mounting disc-like product are installed, the bottom of workbench 10 is provided with the bellmouth of the different deciles of two circles, described bellmouth be fixed on the Last alignment pin 11 of casing and closely cooperate and reach workbench 10 and rotates and the object of fixing.
The cramping body of shear series products is arranged on rotating work top by locating slot and T-slot, it comprises two parts symmetrical relative to main-shaft axis, every part comprises cramping body support 5, cramping body support 5 is horizontally installed with clamping movable block 3, vertically be provided with rotating threaded shaft 1, clamping movable block 3 is fixed by clamp fixed head 2 and clamp nut 4.
Arbitrarily widen according to the large I of work piece body or reduce the distance between cramping body two parts, cramping body has pinching function, to the size shear part practicable more than one piece clamping time processing that there is some difference, working (machining) efficiency more than 6 times can be improved, 45 ° of chamfer machining can be carried out simultaneously.
Rotary table 10 has the chuck coaxial with main shaft to install seam, and namely the fastening screw 9 of chuck, according to the needs of workpiece body, carries out quick-replaceable installation between cramping body and chuck; The bottom surface of workbench is processed with the positioning spigot be connected with main shaft, and the periphery of seam is processed with the conical bore of the different decile of two circles, and conical bore and the alignment pin 11 be fixed on casing closely cooperate and reach worktable rotary and fixing object.
The spindle end be connected with workbench 10 is equipped with angular contact bearing 22, and tail end is equipped with ball bearing 20, is firmly fixed on casing by bearing gland 18,23 bearing inner race spacer and anti-return nut 19, the good axial float limiting main shaft.
Casing 17 side is provided with the step be integrated with it, described step is provided with a groove passed for alignment pin, described alignment pin is firmly fixed in the step groove of casing by clamp nut 13, when needing adjustment, unclamp clamp nut, alignment pin arbitrarily can slide along the step groove of casing and then enter in the dowel hole of different decile circles, only need by tight for the clamp nut back of the body during work.When needing adjustment, unclamp clamp nut, alignment pin arbitrarily can slip in different decile circles along the step groove of casing, only need by tight for the clamp nut back of the body during work; The tail end of alignment pin is processed with the square body of 10 × 10 and coordinates with the elongated slot of operating grip and be connected, when workbench needs rotational angle, leftward while flicking operating grip, right hand rotation work top, alignment pin springs in next bellmouth under spring force.
The calibration number of degrees of difunctional fixture are respectively: 45 °, 60 °, 90 °, 120 ° or 180 °.
Bellmouth is bushing formula bellmouth, forms with alignment pin match grinding.
Alignment pin 11 is arranged on casing 45 ° of directions place, i.e. operator front and workbench X-axis angle direction at 45 ° place.Be characterized in that alignment pin Internal and external cycle is easy to adjust, quick, bellmouth is arranged in the bottom surface of workbench, and object is compression clamp height, convenient operation, leaves larger lifting space to milling machine table.
The operating grip of fixture is lever, is characterized in laborsaving, quick, within each index time can be controlled in 3 seconds.
Shear class piece-holder body, is through practical improvement for many years and forms, have easy, quick, clamping is firm, the range of work is wide, efficiency high, solves the problem of shear like members body difficulty clamping, inefficiency for many years.
This fixture power and energy facilitates rapidly, dismantles chuck install to can be controlled within 1 minute and complete from cramping body.
Positioning datum when Workpiece fixing body 6 is shear like members body more than one piece clampings.
Operating grip 16 is lever-type, and its one end is free end, and the other end is fixed on the step of casing side by an operating grip hold-down screw 15.
The surface cover that alignment pin matches with step groove is equipped with a spring 14, and is set with an alignment pin overcoat 12 in spring 14 outer ring, and described alignment pin overcoat 12 coordinates with the inner surface of step groove.
As shown in Figure 3, that this fixture loads workpiece cramping body, situation to cutting plate type part enforcement more than one piece clamping time processing: concrete procedure of processing is: according to the thickness size of multiple workpieces part, with spanner by counterclockwise rotating cramping body rotary screw 1, then sheet workpiece 25 is placed on above clamping movable block 3, for guaranteeing the uniformity of clamping workpiece, can the side of workpiece 25 be relied on Workpiece fixing body 6, then move in the direction of the clock rotary screw 1, the workpiece that there is certain size difference can be securely held on like this between clamping movable block 3 and support 5.When after Workpiece clamping, can unclamp Workpiece fixing body trip bolt, positioning body is removed to the direction away from workpiece by locating slot, processes to facilitate side.When side completion of processing, when workpiece 25 carries out 45 ° of chamferings according to drawing requirement, left hand presses operating grip 16 downwards, right hand rotation workbench 10, alignment pin 11 enters in the tapered hole in 45 ° of directions under spring force, then can carry out chamfer machining, the like, until completion of processing.Its working (machining) efficiency can raise the efficiency more than 6 times than former processing method.
As shown in Figure 4, fixture is carrying out disc-like halving hole apart from adding man-hour, and need carry out power and energy, scroll chuck 7, while unloading piece-holder body, can be arranged on the chuck seam of workbench 10 by operator, and tightening card disk center fastening bolt.After the disc-like of clamping shown in Fig. 4 workpiece 26 centering, the processing of halving hole distance can be carried out to workpiece 26, as this workpiece carries out 6 halving holes apart from processing, first alignment pin clamp nut 13 is unclamped before operator processes, alignment pin is adjusted in the hole circle of 6 equal portions, and securing dowel clamp nut 13, then can carry out brill Milling Machining to hole by drawing, after treating first hole machined, left hand presses operating grip 16 downwards, right hand rotation work bench with adjustable holder 10, carries out the brill Milling Machining in second hole, according to said method the like.The method is suitable for the polyhedral processing of pipe joint series products equally, and each index time controls, within 3 seconds, to compare with plain dividing head processing method, and its overall processing efficiency can improve more than 1 times.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (10)
1. the difunctional fixture of milling machine, is characterized in that: comprise casing, rotating workbench and main shaft, and described main shaft is a T-shaped main shaft, and the vertical portion of T-shaped main shaft is arranged in casing, and passes through bearing fit between casing; The horizontal component of T-shaped main shaft is exposed to outside casing, is fixedly connected with described workbench, and described workbench can rotate along with the rotation of main shaft; At described workbench, the cramping body for clamping shear series products or the chuck for fixedly mounting disc-like product are installed, the bottom of workbench is provided with the bellmouth of the different deciles of two circles, described bellmouth be fixed on the Last alignment pin of casing and closely cooperate and reach worktable rotary and fixing object.
2. the difunctional fixture of milling machine as claimed in claim 1, it is characterized in that: described cramping body is arranged on rotating work top by locating slot and T-slot, it comprises two parts symmetrical relative to main-shaft axis, every part comprises cramping body support, cramping body support is horizontally installed with clamping movable block, vertically be provided with rotating threaded shaft, the distance between described two parts can arbitrarily widen according to the size of work piece body or reduce.
3. the difunctional fixture of milling machine as claimed in claim 1, is characterized in that: the work top of described rotation has the chuck coaxial with main shaft install seam; The bottom surface of workbench is processed with the positioning spigot be connected with main shaft, and the outer ring of positioning spigot is processed with the conical bore of the different decile of two circles, and described conical bore and the alignment pin be fixed on casing closely cooperate.
4. the difunctional fixture of milling machine as claimed in claim 1, it is characterized in that: the spindle end be connected with workbench is equipped with angular contact bearing, tail end is equipped with ball bearing, described main shaft is firmly fixed on casing by bearing gland, bearing inner race spacer and anti-return nut, limits the axial float of main shaft.
5. the difunctional fixture of milling machine as claimed in claim 1, it is characterized in that: described casing side is provided with the step be integrated with it, described step is provided with a groove passed for alignment pin, described alignment pin is firmly fixed in the step groove of casing by clamp nut, when needing adjustment, unclamp clamp nut, alignment pin arbitrarily can slide along the step groove of casing and then enter in the dowel hole of different decile circles, only need by tight for the clamp nut back of the body during work.
6. the difunctional fixture of milling machine as claimed in claim 5, it is characterized in that: described operating grip is lever-type, its one end is free end, and the other end is fixed on the step of casing side by a screw.
7. the difunctional fixture of milling machine as claimed in claim 1, it is characterized in that: the tail end of described alignment pin is processed with the square body coordinated with the elongated slot of operating grip, when workbench needs rotational angle, leftward while flicking operating grip, right hand rotation work top, alignment pin springs in next bellmouth under spring force.
8. the difunctional fixture of milling machine as claimed in claim 1, is characterized in that: the calibration number of degrees of described difunctional fixture are respectively: 45 °, 60 °, 90 °, 120 ° or 180 °.
9. the difunctional fixture of milling machine as claimed in claim 1, is characterized in that: described alignment pin is arranged on casing 45 ° of directions place, i.e. operator front and workbench X-axis angle direction at 45 ° place.
10. the difunctional fixture of milling machine as claimed in claim 1, it is characterized in that: the surface cover that described alignment pin matches with step groove is equipped with a spring, and being set with an alignment pin overcoat in spring outer ring, described alignment pin overcoat coordinates with the inner surface of step groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510111826.XA CN104690603B (en) | 2015-03-13 | 2015-03-13 | A kind of difunctional fixture of milling machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510111826.XA CN104690603B (en) | 2015-03-13 | 2015-03-13 | A kind of difunctional fixture of milling machine |
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| Publication Number | Publication Date |
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| CN104690603A true CN104690603A (en) | 2015-06-10 |
| CN104690603B CN104690603B (en) | 2017-09-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510111826.XA Active CN104690603B (en) | 2015-03-13 | 2015-03-13 | A kind of difunctional fixture of milling machine |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105345598A (en) * | 2015-12-18 | 2016-02-24 | 湖南机油泵股份有限公司 | Universal rotary working table used for boring mill and convenient for processing shaft holes of box bodies |
| CN107617865A (en) * | 2017-09-28 | 2018-01-23 | 芜湖莫森泰克汽车科技股份有限公司 | Panoramic roofs improve the station of positioning |
| CN108656047A (en) * | 2018-05-23 | 2018-10-16 | 谢云琼 | A kind of petroleum pipeline processing rotation upender |
| CN109396950A (en) * | 2017-08-17 | 2019-03-01 | 上海阿为特精密机械股份有限公司 | Angle positioning device and angle localization method |
| CN110132753A (en) * | 2019-05-11 | 2019-08-16 | 沈阳仪表科学研究院有限公司 | Multistation flex tester |
| WO2021004449A1 (en) * | 2019-07-09 | 2021-01-14 | 科德数控股份有限公司 | Embedded numerical control rotary table |
| CN114952295A (en) * | 2022-06-22 | 2022-08-30 | 刘嵩 | Numerical control milling and boring machine convenient to axial positioning |
| CN116511878A (en) * | 2023-05-09 | 2023-08-01 | 亚资科技股份有限公司 | Automatic pulling and inserting linkage mechanism for rotary indexing and positioning pin |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105345598A (en) * | 2015-12-18 | 2016-02-24 | 湖南机油泵股份有限公司 | Universal rotary working table used for boring mill and convenient for processing shaft holes of box bodies |
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| CN107617865A (en) * | 2017-09-28 | 2018-01-23 | 芜湖莫森泰克汽车科技股份有限公司 | Panoramic roofs improve the station of positioning |
| CN108656047A (en) * | 2018-05-23 | 2018-10-16 | 谢云琼 | A kind of petroleum pipeline processing rotation upender |
| CN110132753A (en) * | 2019-05-11 | 2019-08-16 | 沈阳仪表科学研究院有限公司 | Multistation flex tester |
| WO2021004449A1 (en) * | 2019-07-09 | 2021-01-14 | 科德数控股份有限公司 | Embedded numerical control rotary table |
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| CN114952295A (en) * | 2022-06-22 | 2022-08-30 | 刘嵩 | Numerical control milling and boring machine convenient to axial positioning |
| CN116511878A (en) * | 2023-05-09 | 2023-08-01 | 亚资科技股份有限公司 | Automatic pulling and inserting linkage mechanism for rotary indexing and positioning pin |
| CN116511878B (en) * | 2023-05-09 | 2024-04-05 | 亚资科技股份有限公司 | Automatic pulling and inserting linkage mechanism for rotary indexing and positioning pin |
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|---|---|
| CN104690603B (en) | 2017-09-12 |
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Effective date of registration: 20180323 Address after: 256602 Bohai Road, Shandong, No. twenty-one, No. 569, Binzhou Co-patentee after: BINZHOU BOHAI PRECISION MACHINERY CO., LTD. Patentee after: Binzhou Bohai piston Co., Ltd. Address before: 256602 Bohai Road, Shandong, No. 21, No. 569, Binzhou Co-patentee before: BINZHOU BOHAI PRECISION MACHINERY CO., LTD. Patentee before: Bohai Piston Co., Ltd., Bingzhou City, Shandong Prov. |