CN104190982A - Combined bench drill - Google Patents

Combined bench drill Download PDF

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Publication number
CN104190982A
CN104190982A CN201410407366.0A CN201410407366A CN104190982A CN 104190982 A CN104190982 A CN 104190982A CN 201410407366 A CN201410407366 A CN 201410407366A CN 104190982 A CN104190982 A CN 104190982A
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CN
China
Prior art keywords
bench drill
support
attacked
cylinder
programmable logic
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
Application number
CN201410407366.0A
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Chinese (zh)
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CN104190982B (en
Inventor
冯勇
周伟强
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HAINING LIUHE AUTO PARTS Co Ltd
Original Assignee
HAINING LIUHE AUTO PARTS Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority to CN201410407366.0A priority Critical patent/CN104190982B/en
Priority claimed from CN201410407366.0A external-priority patent/CN104190982B/en
Publication of CN104190982A publication Critical patent/CN104190982A/en
Application granted granted Critical
Publication of CN104190982B publication Critical patent/CN104190982B/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B39/00General-purpose boring or drilling machines or devices; Sets of boring and/or drilling machines
    • B23B39/28Associations of only boring or drilling machines directed to a particular metal-working result

Abstract

The invention provides a combined bench drill and belongs to the technical field of machinery. The combined bench drill solves the problems that investment of an existing combined bench drill device is large and machining cost of a machined workpiece is increased. The combined bench drill comprises a programmable controller and a support fixed to a foundation, the support is fixedly provided with a plurality of bench drill bodies, each bench drill body is provided with a first position sensor, the programmable controller is electrically connected with the first position sensors, the support is connected with an auxiliary support in a sliding mode, the auxiliary support can slide in the direction of the support under drive of a first servo motor, the auxiliary support is provided with a second position sensor, and the first servo motor and the second position sensor are respectively and electrically connected with the programmable controller. Operations can be carried out without skilled workers, off-line operations are achieved, and one person can watch multiple devices.

Description

A kind of combination bench drill
Technical field
The invention belongs to field of mechanical technique, relate to a kind of bench drill, particularly a kind of combination bench drill.
Background technology
Bench drill, due to the flexibility of its mobility and processing, is more and more applied in field of machining.
In the time that the working position of workpiece is more, traditional bench drill has following deficiency: unit station is inadequate, needs multiple clamping, thereby loses the accuracy of form and position; The brill that depends on professional skilled worker is attacked technical ability, in the today of manually growing to even greater heights, and a great problem of can yet be regarded as.If abandon bench drill and then adopt numerical control machining center processing, but its equipment investment is large, increase workpiece processing cost; The 2nd, machining center energy consumption is high, has increased use cost.
In prior art, attempt in addition by bench drill is reequiped, then the bench drill after repacking is carried out to multistage-combination (being operated by skilled craftsman), having solved unit multiple clamping affects the drawback of the accuracy of form and position, but workman can only operate such building-block machine, and the working environment of workers is severe, and (Mechanical processing of casting dust is serious, manual operation inconvenience is used cooling), be not suitable with equally the development of modernization industry.
The application number of announcing as the Patent Office of the People's Republic of China one combination bench drill patent that is 201120545666.7, has set forth this combination bench drill and has comprised bench drill and table top, above-mentioned bench drill have two and more than, above-mentioned bench drill is distributed in a row; Table top one links together.The utility model combines by reasonable Arrangement bench drill, can realize streamlined operation, and efficiency is high, and processing high conformity, has saved manpower greatly.Although combinations thereof bench drill can be realized automatic processing component, need processing to need workman's co-operating, increase cost of labor, automation is low.
Therefore, need one to meet multistation and automatically process, manufacture, use cost is cheap, do not rely on the combination bench drill of skilled worker's technical ability.
Summary of the invention
The object of the invention is to have the problems referred to above for existing technology, proposed one and met multistation and automatically process, manufacture, use cost is cheap, do not rely on the combination bench drill of skilled worker's technical ability.
Object of the present invention can realize by following technical proposal:
A kind of combination bench drill, the support that it comprises Programmable Logic Controller and is fixed on ground, is fixed with some bench drills on support described in described support, and described bench drill is provided with position sensor one, and described Programmable Logic Controller is electrically connected with described position sensor one; On described support, slidably connect assistant support, described assistant support can slide along the direction of described support, and this slip is driven by servomotor one, described assistant support is provided with position sensor two, and described servomotor one is all electrically connected with described Programmable Logic Controller with described position sensor two; Described assistant support is provided with workbench, described workbench and described assistant support are slidably connected, described workbench is along sliding on assistant support with the perpendicular direction of assistant support glide direction, described slip is driven by servomotor two, described workbench is provided with position sensor three, and position sensor three is all electrically connected with described Programmable Logic Controller described in described servomotor two.
Further, being slidably connected between described support and assistant support drives ball screw one along ball slide rail one realization by servomotor one.
Further, being slidably connected between described assistant support and workbench drives ball screw two along ball slide rail two realizations by servomotor two.
Further, on described workbench, be rotatably connected to fixture installation portion, described fixture can mate design according to the different structure of processing work, be typically designed to many groups, all match with described fixture installation portion in the installation position of described many group fixtures, described fixture installation portion can with the perpendicular rotation with in surface of described movable workbench direction, and the rotational plane of described fixture installation portion and described assistant support perpendicular along the direction of motion of support.
Further, being rotationally connected by servomotor three between described fixture installation portion and described workbench drives, and described workbench is provided with position sensor three, and described private takes motor three and is all electrically connected with described Programmable Logic Controller with described position sensor three.
Further, described workbench is provided with angular transducer, and described angular transducer is electrically connected with described Programmable Logic Controller.
Further, described bench drill comprise wind-powered electricity generation unit head and with the supporting column of described wind-powered electricity generation unit head, described wind-powered electricity generation unit head comprises cutter power motor, feeding cylinder and hydraulic damping, described cutter power motor is attacked cutlery for brill enough cutting power is provided,, the root of described column is fixedly connected with described support, the top of described column is fixedly connected with cantilever, axially axially perpendicular with described column of described cantilever, the end of described cantilever slidably connects to bore and attacks to cylinder, described brill is attacked axially axially perpendicular with described cantilever to cylinder, described brill is attacked to be fixedly connected with to bore to the lower end of cylinder and is attacked cutlery clamping device, described brill is attacked in cutlery clamping device, to be equipped with to bore and is attacked cutlery, described brill is attacked to the top of cylinder and is fixedly connected with housing, the transmission mechanism that described housing is provided with cutlery power motor and is driven by cutlery power motor, described transmission mechanism is attacked to cylinder and is fixedly connected with brill, described air inlet cylinder is communicated with execution cylinder, feeding cylinder is attacked the degree of depth by execution cylinder for brill by compressed air power is provided.
Further, described transmission mechanism is provided with to control and bores the hydraulic damping of attacking cutlery feed speed, and described hydraulic damping is electrically connected with described Programmable Logic Controller.
Further, described brill is attacked to cylinder and is communicated with gas pressure pipe, and described brill is attacked to cylinder and is electrically connected with magnetic valve, and described magnetic valve is electrically connected with described Programmable Logic Controller.
Further, described Programmable Logic Controller comprises a touch-screen and a memory, and described touch-screen is electrically connected with described Programmable Logic Controller, and described memory stores has product processing control parameter.
Compared with prior art, the beneficial effect of this combination bench drill is:
1. the relatively described support of assistant support is slidably connected, and the relatively described support of workbench is slidably connected, and realizes workbench and freely adjusts according to actual needs in support plane;
2. fixture installation portion is at the rotation with in surface vertical with support plane, and the side surface of workpiece position that makes to be contained on fixture also can process;
3. Programmable Logic Controller and sensor synergism work, controlled working parameter, technique adjustment is quick precisely reliable;
4. clamped one time completes multistage manufacturing processes, has reduced workman's labour intensity, has saved production cost;
5. do not rely on skilled craftsman, off-line operation, realize a people and keep an eye on multiple devices;
6. the operation of manual operation is replaced with to Controlled by Programmable Controller, get rid of the unstability of manual operation;
7. fixture installation portion is provided with fixture, can be according to the corresponding fixture of the structural design of workpiece to be machined, make the standby well processing of described compound table drilling tool autgmentability;
8. being slidably connected between being slidably connected between assistant support and support, described workbench and assistant support drives corresponding ball screw to move along ball slide rail separately by servomotor one and servomotor two respectively, realize the hi-Fix in process, increased the stable of described combination bench drill;
9. design, cheap for manufacturing cost, energy-saving and cost-reducing.
Brief description of the drawings
Fig. 1 is the structural representation of combination bench drill;
Fig. 2 is the structural representation of bench drill in Fig. 1;
Fig. 3 is the transmission sketch of combination bench drill;
Fig. 4 is the electric drawings of combination bench drill.
In figure, 1, support; 11, servomotor one; 12, ball-screw one; 13, ball slide rail one; 2, assistant support; 21, servomotor two; 22, ball-screw two; 23, ball slide rail two; 3, fixture installation portion; 31, servomotor three; 4, bench drill; 41, cutter power motor; 42, hydraulic damping; 43, bore and attack to cylinder; 44, drill bit.
Detailed description of the invention
A kind of combination bench drill, the support 1 that it comprises Programmable Logic Controller and is fixed on ground, is fixed with some bench drills 4 on described support 1, and described bench drill 4 is provided with position sensor one, and described Programmable Logic Controller is electrically connected with described position sensor one; On described support 1, slidably connect assistant support 2, described assistant support 2 can slide along the direction of described support 1, and this slip is driven by servomotor 11, described assistant support 2 is provided with position sensor two, and described servomotor 11 is all electrically connected with described Programmable Logic Controller with described position sensor two; Described assistant support 2 is provided with workbench, described workbench and described assistant support 2 are slidably connected, described workbench is along sliding on assistant support 2 with the perpendicular direction of assistant support 2 glide directions, described slip is driven by servomotor 2 21, described workbench is provided with position sensor three, and position sensor three is all electrically connected with described Programmable Logic Controller described in described servomotor 2 21.The relatively described support 1 of described assistant support 2 is slidably connected, and the relatively described support 1 of described workbench is slidably connected, and realizes workbench and freely adjusts according to actual needs in support 1 plane; Described fixture installation portion 3 is at the rotation with in surface vertical with support 1 plane, and the side surface of workpiece position that makes to be contained on fixture also can process; Programmable Logic Controller and sensor synergism work, controlled working parameter, technique adjustment is quick precisely reliable.
Being slidably connected between support 1 and assistant support 2 drives ball screw 1 to move along ball slide rail 1 by servomotor 11; Being slidably connected between described assistant support 2 and workbench drives ball screw 2 22 to move along ball slide rail 2 23 by servomotor 2 21.Realize the hi-Fix in process, increased the operation stability of described combination bench drill.
On workbench, be rotatably connected to fixture installation portion 3, described fixture can mate design according to the different structure of processing work, be typically designed to many groups, all match with described fixture installation portion 3 in the installation position of described many group fixtures, described fixture installation portion 3 can with the perpendicular rotation with in surface of described movable workbench direction, and the rotational plane of described fixture installation portion 3 and described assistant support 2 perpendicular along the direction of motion of support 1.Described fixture installation portion 3 is provided with fixture, described fixture can mate design according to the different structure of processing work, being typically designed to many groups, all matches with described fixture installation portion 3 in the installation position of described many group fixtures, makes the standby well processing of described compound table drilling tool autgmentability.Being rotationally connected by servomotor 3 31 between described fixture installation portion 3 and described workbench drives, and described workbench is provided with position sensor three, and described private takes motor three and is all electrically connected with described Programmable Logic Controller with described position sensor three.Described workbench is provided with angular transducer, and described angular transducer is electrically connected with described Programmable Logic Controller.
Described bench drill 4 comprise wind-powered electricity generation unit head and with the supporting column of described wind-powered electricity generation unit head, described wind-powered electricity generation unit head comprises cutter power motor 41, feeding cylinder and hydraulic damping 42, described cutter power motor 41 is attacked cutlery for brill enough cutting power is provided, and the root of described column is fixedly connected with described support 1, the top of described column is fixedly connected with cantilever, axially axially perpendicular with described column of described cantilever, the end of described cantilever slidably connects to bore and attacks to cylinder 43, described brill is attacked axially axially perpendicular with described cantilever to cylinder 43, described brill is attacked to be fixedly connected with to bore to the lower end of cylinder 43 and is attacked cutlery clamping device, described brill is attacked in cutlery clamping device, to be equipped with to bore and is attacked cutlery, described brill is attacked to the top of cylinder 43 and is fixedly connected with housing, the transmission mechanism that described housing is provided with cutlery power motor and is driven by cutlery power motor, described transmission mechanism is attacked to cylinder 43 and is fixedly connected with brill, described air inlet cylinder is communicated with execution cylinder, feeding cylinder is attacked the degree of depth by execution cylinder for brill by compressed air power is provided.Described transmission mechanism is provided with to control and bores the hydraulic damping 42 of attacking cutlery feed speed, and described hydraulic damping 42 is electrically connected with described Programmable Logic Controller.Described brill is attacked to cylinder 43 and is communicated with gas pressure pipe, and described brill is attacked to cylinder 43 and is electrically connected with magnetic valve, and described magnetic valve is electrically connected with described Programmable Logic Controller.
Described Programmable Logic Controller comprises a touch-screen and a memory, described touch-screen is electrically connected with described Programmable Logic Controller, and described memory stores has product processing control parameter, and clamped one time completes multistage manufacturing processes, reduce workman's labour intensity, saved production cost.
When concrete use:
A, described combination bench drill first make zero to one end of described stand 1, controller control servomotor 1 rotates, power is transferred to described assistant support 2 through ball-screw 1 and ball slide rail 1, horizontally slips in the horizontal direction with respect to support 1 to realize assistant support 2.Its complete be that position sensor two on support 1 is that carry out by being arranged on, Programmable Logic Controller and servomotor one 11 collaborative works realize, when position sensor two senses the backward Programmable Logic Controller transmitted signal of calibrating position of described support 1, Programmable Logic Controller receives to be controlled servomotor 1 after this signal and stops operating, and described combination bench drill completes zero point correction work.Then select matched clamp according to processing work, fixture is installed to fixture installation portion 3, finally clamping workpiece is completed to clamping workpiece work at described fixture installation portion 3.
B, assistant support 2 is navigated to processing stations point, described Programmable Logic Controller obtains the exact position along support glide direction of assistant support 2 by being located at position sensor two on support 1; In like manner, described Programmable Logic Controller obtains the exact position of fixture installation portion 3 along assistant support 2 glide directions by the position sensor three of being located on assistant support 2; Described Programmable Logic Controller obtains the accurate machining position of workpiece by being located at the angular transducer of fixture installation portion 3.By more than, ensure the processing free degree of workpiece in space.
C, startup cutter power motor 41, described Programmable Logic Controller is attacked the electric command signal of sending to the air-operated solenoid valve of cylinder 43 to described brill, and bench drill 4 is started working, and carries out air cylinder driven drill bit 44 fast approaching workpiece positions to be processed.
D, in the time arriving the position that hydraulic damping 42 sets, described drill bit 4 does drilling feed motion (at the uniform velocity stablize feed, beginning cutting workpiece).
E, arrive while setting the drilling degree of depth when drill bit 4, by the position sensor one being loaded on bench drill 4, bit location is fed back to Programmable Logic Controller, programmable controller PC L sends the signal of telecommunication of homing and closes cutter power motor 41 to reach energy-conservation object to the magnetic valve of the feeding cylinder of controlling wind-powered electricity generation unit head, so far completes whole processing actions of the first station; Then perform step b, workpiece is accurately positioned to next station, complete processing action; Circulation is gone down until complete the processing of last station successively.After the machining of all stations, be located at position sensor two on support 1 to Programmable Logic Controller transmitted signal, described Programmable Logic Controller is controlled servomotor 3 31, servomotor 2 21, servomotor 1 successively, makes respectively described fixture installation portion 3 circumference resets, described fixture installation portion 3 horizontal resets and described assistant support 2 horizontal resets.

Claims (10)

1. a combination bench drill, is characterized in that: the support that it comprises Programmable Logic Controller and is fixed on ground, on described support, be fixed with some bench drills, and described bench drill is provided with position sensor one, and described Programmable Logic Controller is electrically connected with described position sensor one; On described support, slidably connect assistant support, described assistant support can slide along the direction of described support, and this slip is driven by servomotor one, described assistant support is provided with position sensor two, and described servomotor one is all electrically connected with described Programmable Logic Controller with described position sensor two; Described assistant support is provided with workbench, described workbench and described assistant support are slidably connected, described workbench is along sliding on assistant support with the perpendicular direction of assistant support glide direction, described slip is driven by servomotor two, described workbench is provided with position sensor three, and position sensor three is all electrically connected with described Programmable Logic Controller described in described servomotor two.
2. combination bench drill according to claim 1, is characterized in that: being slidably connected between described support and assistant support drives ball screw one along ball slide rail one realization by servomotor one.
3. combination bench drill according to claim 1, is characterized in that: being slidably connected between described assistant support and workbench drives ball screw two along ball slide rail two realizations by servomotor two.
4. according to the combination bench drill described in claim 2 or 3, it is characterized in that: on described workbench, be rotatably connected to fixture installation portion, described fixture can mate design according to the different structure of processing work, be typically designed to many groups, all match with described fixture installation portion in the installation position of described many group fixtures, described fixture installation portion can with the perpendicular rotation with in surface of described movable workbench direction, and the rotational plane of described fixture installation portion and described assistant support perpendicular along the direction of motion of support.
5. combination bench drill according to claim 4, it is characterized in that: being rotationally connected by servomotor three between described fixture installation portion and described workbench drives, described workbench is provided with position sensor three, and described private takes motor three and is all electrically connected with described Programmable Logic Controller with described position sensor three.
6. combination bench drill according to claim 5, is characterized in that: described workbench is provided with angular transducer, described angular transducer is electrically connected with described Programmable Logic Controller.
7. combination bench drill according to claim 1, it is characterized in that: described bench drill comprise wind-powered electricity generation unit head and with the supporting column of described wind-powered electricity generation unit head, described wind-powered electricity generation unit head comprises cutter power motor, feeding cylinder and hydraulic damping, described cutter power motor is attacked cutlery for brill enough cutting power is provided,, the root of described column is fixedly connected with described support, the top of described column is fixedly connected with cantilever, axially axially perpendicular with described column of described cantilever, the end of described cantilever slidably connects to bore and attacks to cylinder, described brill is attacked axially axially perpendicular with described cantilever to cylinder, described brill is attacked to be fixedly connected with to bore to the lower end of cylinder and is attacked cutlery clamping device, described brill is attacked in cutlery clamping device, to be equipped with to bore and is attacked cutlery, described brill is attacked to the top of cylinder and is fixedly connected with housing, the transmission mechanism that described housing is provided with cutlery power motor and is driven by cutlery power motor, described transmission mechanism is attacked to cylinder and is fixedly connected with brill, described air inlet cylinder is communicated with execution cylinder, feeding cylinder is attacked the degree of depth by execution cylinder for brill by compressed air power is provided.
8. combination bench drill according to claim 7, is characterized in that: described transmission mechanism is provided with to control and bores the hydraulic damping of attacking cutlery feed speed, and described hydraulic damping is electrically connected with described Programmable Logic Controller.
9. combination bench drill according to claim 7, is characterized in that: described brill is attacked to cylinder and is communicated with gas pressure pipe, and described brill is attacked to cylinder and is electrically connected with magnetic valve, and described magnetic valve is electrically connected with described Programmable Logic Controller.
10. combination bench drill according to claim 1, is characterized in that: described Programmable Logic Controller comprises a touch-screen and a memory, and described touch-screen is electrically connected with described Programmable Logic Controller, and described memory stores has product processing control parameter.
CN201410407366.0A 2014-08-18 A kind of combination bench drill Active CN104190982B (en)

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CN201410407366.0A CN104190982B (en) 2014-08-18 A kind of combination bench drill

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Application Number Priority Date Filing Date Title
CN201410407366.0A CN104190982B (en) 2014-08-18 A kind of combination bench drill

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CN104190982B CN104190982B (en) 2017-01-04

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Cited By (11)

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Publication number Priority date Publication date Assignee Title
CN104475800A (en) * 2014-12-15 2015-04-01 济南玫德铸造有限公司 Automatic drilling machine
CN105881040A (en) * 2016-06-20 2016-08-24 黄巧玲 Novel durable machining working table device and using method thereof
CN105904230A (en) * 2016-06-20 2016-08-31 黄清霞 Workbench device for durable machining and using method thereof
CN105904228A (en) * 2016-06-20 2016-08-31 陈丽鹃 Machining workbench device and using method thereof
CN105904220A (en) * 2016-06-20 2016-08-31 徐传盛 Novel machining workbench device and using method thereof
CN105904231A (en) * 2016-06-20 2016-08-31 黄巧玲 Worktable device used for workpiece machining and use method thereof
CN105904229A (en) * 2016-06-20 2016-08-31 黄清霞 Workbench device for machining durable workpieces and using method thereof
CN106001680A (en) * 2016-07-17 2016-10-12 张凤平 Intelligent drill bit machine tool
CN106827253A (en) * 2016-12-28 2017-06-13 常州中车汽车零部件有限公司 A kind of automatic punch and boring method
CN107363285A (en) * 2017-07-12 2017-11-21 邓干平 A kind of large-sized numerical control combination drilling machine and coordinate transformation method
CN112894993A (en) * 2019-12-03 2021-06-04 财团法人工业技术研究院 Drilling system and method thereof

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CN201366519Y (en) * 2009-02-10 2009-12-23 应云富 Gantry type automatic step air-feed deep-hole drilling machine
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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104475800A (en) * 2014-12-15 2015-04-01 济南玫德铸造有限公司 Automatic drilling machine
CN105904231B (en) * 2016-06-20 2018-05-11 惠安县宝安汽车维修有限公司 A kind of table device and its application method for work pieces process
CN105904228A (en) * 2016-06-20 2016-08-31 陈丽鹃 Machining workbench device and using method thereof
CN105904220B (en) * 2016-06-20 2018-05-11 泉州永春草根生农业有限公司 A kind of new processing work table apparatus and its application method
CN105904230B (en) * 2016-06-20 2018-05-11 泉州永春泰宇机械加工有限公司 A kind of long-life machine processing table device and its application method
CN105904231A (en) * 2016-06-20 2016-08-31 黄巧玲 Worktable device used for workpiece machining and use method thereof
CN105904229A (en) * 2016-06-20 2016-08-31 黄清霞 Workbench device for machining durable workpieces and using method thereof
CN105904228B (en) * 2016-06-20 2018-05-11 泉州永春泰宇机械加工有限公司 A kind of processing work table apparatus and its application method
CN105881040B (en) * 2016-06-20 2018-05-11 惠安县宝安汽车维修有限公司 A kind of novel durable processing work table apparatus and its application method
CN105904229B (en) * 2016-06-20 2018-05-11 泉州永春泰宇机械加工有限公司 A kind of durable work pieces process table device and its application method
CN105904230A (en) * 2016-06-20 2016-08-31 黄清霞 Workbench device for durable machining and using method thereof
CN105904220A (en) * 2016-06-20 2016-08-31 徐传盛 Novel machining workbench device and using method thereof
CN105881040A (en) * 2016-06-20 2016-08-24 黄巧玲 Novel durable machining working table device and using method thereof
CN106001680A (en) * 2016-07-17 2016-10-12 张凤平 Intelligent drill bit machine tool
CN106827253A (en) * 2016-12-28 2017-06-13 常州中车汽车零部件有限公司 A kind of automatic punch and boring method
CN106827253B (en) * 2016-12-28 2018-10-02 常州中车汽车零部件有限公司 A kind of automatic punch and boring method
CN107363285B (en) * 2017-07-12 2019-06-07 邓干平 A kind of large-sized numerical control combination drilling machine and coordinate transformation method
CN107363285A (en) * 2017-07-12 2017-11-21 邓干平 A kind of large-sized numerical control combination drilling machine and coordinate transformation method
CN112894993A (en) * 2019-12-03 2021-06-04 财团法人工业技术研究院 Drilling system and method thereof

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