CN107175360A - Milling machine and milling machine spindle operation control system - Google Patents
Milling machine and milling machine spindle operation control system Download PDFInfo
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- CN107175360A CN107175360A CN201610137914.1A CN201610137914A CN107175360A CN 107175360 A CN107175360 A CN 107175360A CN 201610137914 A CN201610137914 A CN 201610137914A CN 107175360 A CN107175360 A CN 107175360A
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- main shaft
- milling machine
- controller
- control system
- operation control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C3/00—Milling particular work; Special milling operations; Machines therefor
- B23C3/13—Surface milling of plates, sheets or strips
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Abstract
The invention discloses a kind of milling machine spindle operation control system, including it is powered and produces magnetic field to drive main shaft coil that main shaft rotates and for the power supply to the main shaft coil input current；Also include being used to change the reversing arrangement of the electric current input direction of the main shaft coil and the controller for controlling the reversing arrangement, the reversing arrangement is connected between the main shaft coil and the power supply and is electrically connected with the controller., can be by controlling the direction of rotation of main shaft during the milling machine spindle operation control system provided using the present invention, thorough removal easily and effectively or the burr for avoiding process from producing, and then avoid harmful effect of the burr to following process process.Meanwhile, without secondary drilling technique, it is to avoid the harmful effect of inclined double of the hole precision of brill.Include the milling machine of above-mentioned milling machine spindle operation control system the invention also discloses a kind of.
Description
Technical field
The present invention relates to machining technology field, run more specifically to a kind of milling machine spindle
Control system, further relates to a kind of include the milling machine of above-mentioned milling machine spindle operation control system.
Background technology
Milling machine refers generally to be processed the lathe on a variety of surfaces on workpiece with milling cutter.Usual milling cutter rotary motion
For main motion, the movement of workpiece or milling cutter is feed motion, is that a kind of very conventional machining is set
It is standby.Outside milling machine decapacitation milling plane, groove, the gear teeth, screw thread and splined shaft, moreover it is possible to which processing is more multiple
Miscellaneous type face, is widely used in machine-building and repairing department.
In printed circuit board field, milling machine is commonly used for the processing to half bore etc..Using process PTH half bore as
Example, the direction of rotation of general its main shaft of CNC milling machine is clockwise, traditionally referred to as dextrorotation knife.
Going out when processing PTH half bore in the case that cutter spacing do not have burr, it enters cutter spacing and hair typically each occurs
Thorn.And the generation of burr is also easy to produce harmful effect, such as the SMT producers in downstream to subsequent processing operations
Welding process in, easily occur solder joint loosely, rosin joint, bridge joint short circuit the problems such as.
For the influence of burr is reduced or avoided, in the prior art to go generally by way of secondary drilling
Flash removed.As produced burr in access site, secondary drilling can be carried out in access site.However,
Though by way of secondary drilling can a certain degree of reduction burr, secondary drilling bores inclined probability very
Greatly, it is difficult to which while effectively removing flash removed, the accuracy to endoporus has a negative impact.Meanwhile, two
The mode of secondary drilling, need to increase processing process, more waste time and energy.And thoroughly to remove flash removed,
Generally need further by manually repairing burr, thus expend a large amount of manpowers, reduction production efficiency,
Increase production cost.
In summary, it is also easy to produce burr when how to efficiently solve milling machine processing and burr is difficult effectively to go
Except the problems such as, be current those skilled in the art's urgent problem.
The content of the invention
In view of this, first purpose of the invention is to provide a kind of milling machine spindle operation control system,
The structure design of the milling machine spindle operation control system is also easy to produce hair when can efficiently solve milling machine processing
Thorn and the problem of burr is difficult effective remove, second object of the present invention be to provide it is a kind of include it is above-mentioned
The milling machine of milling machine spindle operation control system.
In order to reach above-mentioned first purpose, the present invention provides following technical scheme：
A kind of milling machine spindle operation control system, including energization produce magnetic field to drive the master that main shaft rotates
Axial coil and for the power supply to the main shaft coil input current；Also include being used to change the main shaft
The reversing arrangement of the electric current input direction of coil and the controller for controlling the reversing arrangement, it is described
Reversing arrangement is connected between the main shaft coil and the power supply and is electrically connected with the controller.
Preferably, in above-mentioned milling machine spindle operation control system, the reversing arrangement is frequency converter, institute
Controller is stated to be connected between the main shaft coil and the frequency converter.
Preferably, in above-mentioned milling machine spindle operation control system, it is provided with the controller clockwise
Switch and counterclockwise switch, the controller controls the reversing arrangement during switch connection clockwise
Changing the sense of current makes the main shaft turn clockwise；The controller when counterclockwise switch is connected
Controlling the reversing arrangement to change the sense of current rotates the spindle axis counterclockwise.
Preferably, in above-mentioned milling machine spindle operation control system, the controller is can be according to default
Main shaft described in programme-control turn clockwise or rotate counterclockwise controller.
Preferably, in above-mentioned milling machine spindle operation control system, in addition to for monitoring the main shaft rotation
Turn the monitoring device in direction, the monitoring device is electrically connected with the controller.
Preferably, in above-mentioned milling machine spindle operation control system, the controller is for according to described
The monitoring result of monitoring device judge the main shaft whether the controller rotated according to preset rotation direction,
It is additionally included in the warning device that alarm is carried out when the main shaft does not rotate according to preset rotation direction.
Preferably, in above-mentioned milling machine spindle operation control system, the warning device is audible-visual annunciator
Or phonetic alarm.
Preferably, in above-mentioned milling machine spindle operation control system, the controller is for by the master
The controller that error message when axle does not rotate according to preset rotation direction is recorded.
Preferably, in above-mentioned milling machine spindle operation control system, in addition to for being filled according to the monitoring
The monitoring result put shows the display device of the direction of rotation of the main shaft.
The milling machine spindle operation control system that the present invention is provided includes main shaft coil, power supply, reversing arrangement
And controller.Wherein, main shaft coil is used to produce drive main shaft rotation in magnetic field when it is powered；Power supply
For to main shaft coil power supply, i.e., to main shaft coil input current；Controller electrically connects with reversing arrangement
Connect, for controlling reversing arrangement, by reversing arrangement change main shaft coil electric current input direction with up to
To the control to input current direction, and then control the steering of main shaft.
Using the present invention provide milling machine spindle operation control system when, power supply provide electric current through commutation
Device is inputted to main shaft coil, the control by controller to reversing arrangement, to change main shaft coil
Electric current input direction, and then change the steering of main shaft, it is turned clockwise, also can be inverse
Hour hands rotate.Therefore, can be by controlling main shaft suitable in the isostructural process of PTH half bore
Hour hands rotate, and milling cutter row knife direction on the left of half bore to the left to being processed, because section is leaned against
Substrate layer, effectively prevent the extension of metal level and the disengaging of metal level and hole wall, so as to avoid
The generation of burr；For the right side of half bore, then reversing arrangement is controlled to change main shaft by controller
The electric current input direction of circle, rotates spindle axis counterclockwise, the right side of milling cutter row knife direction to the right to half bore
It is processed, because section also leans against substrate layer, prevents extension and metal level and the hole wall of metal level
Disengaging, it is to avoid burr produce.Therefore by controlling main shaft direction of rotation, double of hole machined is avoided
Burr is produced, and then avoids harmful effect of the burr to following process process.Meanwhile, add without secondary
Work removes flash removed, effectively increases processing efficiency.And without secondary drilling technique, it is to avoid it is partially right to bore
The harmful effect of half hole precision.In summary, the milling machine spindle operation control system provided using the present invention
System can be easily and effectively thorough removal process produce burr, and then improve production efficiency, drop
Low production cost.
In order to reach above-mentioned second purpose, present invention also offers a kind of milling machine, the milling machine includes upper
State any milling machine spindle operation control system.Because above-mentioned milling machine spindle operation control system has
Above-mentioned technique effect, the milling machine with the milling machine spindle operation control system should also have corresponding technology
Effect.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be right
The accompanying drawing used required in embodiment or description of the prior art is briefly described, it should be apparent that,
Drawings in the following description are only some embodiments of the present invention, for those of ordinary skill in the art
For, on the premise of not paying creative work, it can also be obtained according to these accompanying drawings other attached
Figure.
A kind of structure of embodiment of milling machine spindle operation control system that Fig. 1 provides for the present invention
Schematic diagram.
Marked in accompanying drawing as follows：
Main shaft coil 101, controller 102, frequency converter 103, power supply 104.
Embodiment
The embodiment of the invention discloses a kind of milling machine spindle operation control system, with removal easily and effectively
The burr that milling machine processing is produced.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is entered
Row is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the invention,
Rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not having
There is the every other embodiment made and obtained under the premise of creative work, belong to what the present invention was protected
Scope.
Referring to Fig. 1, milling machine spindle operation control system one kind specific implementation that Fig. 1 provides for the present invention
The structural representation of mode.
In a kind of embodiment, the milling machine spindle operation control system that the present invention is provided includes master
Axial coil 101, power supply 104, reversing arrangement and controller 102.
Wherein, main shaft coil 101 is used to drive main shaft rotation, power supply 104 when its energization produces magnetic field
For being powered to main shaft coil 101, i.e., to the input current of main shaft coil 101.Specific main shaft coil 101
Set location structure etc. refer to prior art, and here is omitted.The design parameter of power supply 104, to
The principle of the input current of main shaft coil 101 to drive main shaft rotation etc. specifically also refer in the prior art
It is related set and principle, also repeat no more herein.
Reversing arrangement is arranged between power supply 104 and main shaft coil 101, and is electrically connected with the two.
The electric current of power supply 104 is inputted into main shaft coil 101 through reversing arrangement.Reversing arrangement is used to change electric current
Flow direction, that is, change the sense of current of entering spindle coil 101, and then change the rotation side of main shaft
To.Controller 102 is electrically connected with reversing arrangement, the working condition for controlling reversing arrangement, and then
Reach the purpose controlled the electric current input direction of main shaft coil 101.Controller 102 can be reversing arrangement
Built-in controller, or be arranged at the controller 102 outside reversing arrangement.Specific controller 102
Model and the setting of design parameter can be selected according to actual needs, be not specifically limited herein,
Only need that the control to the input current direction of main shaft coil 101 can be reached.
Based on burr Producing reason, by taking PTH half bore as an example, a plated through-hole is in PCB unit profiles
On, two ends are respectively the first intersection point and the second intersection point, and the second intersection point is that, into the edge of a knife, the first intersection point is
The edge of a knife.So when dextrorotation milling cutter in milling to the second intersection point when, the second intersection point by one to the right
Shearing force F.Ideally shearing force F cuts off the second point of intersection.But it is attached on hole wall
Copper be with ductility and toughness, milling cutter when metal layer of the hole wall based on copper is switched to,
It is also easy to produce burr residual.And in most cases, because milling cutter is cutting to the section of the first intersection point
When, the via hole layer of the first intersection point is first cut to, the first intersection point metal layer is with the second intersection point
The via hole layer it is the same, can be deformed upon due to the ductility of metal, but the first intersection point section is carried on the back
Against substrate layer, the extension of metal level and the disengaging of metal level and hole wall are effectively prevent, thus
Burr is general only in the second intersection point without being produced in the first intersection point.
Based on this, using the present invention provide milling machine spindle operation control system when, power supply 104 provide
Electric current is inputted to main shaft coil 101 through reversing arrangement, the control by controller 102 to reversing arrangement,
To change the electric current input direction of main shaft coil 101, and then change the steering of main shaft, make it suitable
Hour hands rotate, also being capable of rotate counterclockwise.Therefore, in the isostructural process of PTH half bore,
Pcb board loads onto milling machine, can first determine milling position clockwise and milling position counterclockwise, then controller 102
Accordingly rotation is processed control main shaft to correspondence position.Specifically, can be by controlling main shaft up time
Pin rotates, and milling cutter row knife direction on the left of half bore to the left to being processed, because section leans against base
Material layer, effectively prevent the extension of metal level and the disengaging of metal level and hole wall, so as to avoid hair
The generation of thorn；For the right side of half bore, then reversing arrangement is controlled to change main shaft by controller 102
The electric current input direction of circle, rotates spindle axis counterclockwise, the right side of milling cutter row knife direction to the right to half bore
It is processed, because section also leans against substrate layer, prevents extension and metal level and the hole wall of metal level
Disengaging, it is to avoid burr produce.Therefore by controlling main shaft direction of rotation, double of hole machined is avoided
Burr is produced, and then avoids harmful effect of the burr to following process process.Meanwhile, add without secondary
Work removes flash removed, effectively increases processing efficiency.And without secondary drilling technique, it is to avoid it is partially right to bore
The harmful effect of half hole precision.Pcb board can be transported by transfer plate after machining.In summary,
Thoroughly removal that can be easily and effectively using the milling machine spindle operation control system of body of the present invention is processed
The burr that journey is produced.
Specifically, reversing arrangement can use frequency converter 103, and controller 102 can be connected to main shaft
Between circle 101 and frequency converter 103, and then it is easy to control frequency converter 103 to change the electricity of main shaft coil 101
Flow input direction.Certainly, reversing arrangement can also can change the electric current of main shaft coil 101 using others
The equipment of input direction, such as passes through the setting of combinational.
Further, for ease of the control to spindle rotating direction, it can set and open clockwise on controller 102
Close and counterclockwise switch, the control of controller 102 reversing arrangement changes the sense of current during switch connection clockwise
Main shaft is set to turn clockwise；The control of controller 102 reversing arrangement changes electric current side when counterclockwise switch is connected
Rotated to spindle axis counterclockwise is made.And then when processing, it is manually operated opening clockwise on controller 102
Close and counterclockwise switch is controlled to the direction of rotation of main shaft, easily to carry out positive and negative milling, side
The processing of metallization process etc., effectively removes the burr that process is produced.
On the basis of the various embodiments described above, controller 102 can be that can be controlled to lead according to pre-set programs
The controller 102 that axle turns clockwise with rotate counterclockwise.Namely by before processing starts, inputting
Pre-set programs, are processed according to pre-set programs automatically after starting processing.When processing, pcb board is filled
Upper milling machine, the milling position clockwise and milling position counterclockwise positioned according to pre-set programs, can specifically be positioned
Milling position clockwise and the position coordinates of milling position counterclockwise, then according to position coordinates and corresponding rotation
Turn direction controlling motion of main shaft, be processed.Pre-set programs generally comprise milling position clockwise, inverse time
Pin milling position, corresponding main shaft turns clockwise rotating speed and spindle axis counterclockwise rotary rpm etc., controller
102 send control instruction according to pre-set programs to reversing arrangement, it is carried out according to pre-set programs to workpiece
Automatic processing.Reversing arrangement is used for the direction of rotation for changing main shaft, for the feeding of milling cutter opposite piece
Motion refers to prior art.Controller 102 is used to control reversing arrangement to control main shaft direction of rotation
System, controller 102 as needed can be used for the feed motion to milling cutter opposite piece and be controlled.
Specifically touch-screen can be set on controller 102, pre-set programs are configured by touch-screen.
It is of course also possible to be configured by other conventional modes to pre-set programs.
Further, to ensure that main shaft can be carried out clockwise or counterclockwise according to pre-set programs,
It can also further be provided for monitoring the monitoring device of main shaft direction of rotation, and monitoring device and control
Device 102 is electrically connected with, and then by the main shaft direction of rotation feedback of the information monitored to controller 102.Tool
Body, monitoring device can be that can detect the sensor of direction of rotation.
Further, controller 102 can be to judge main shaft for the monitoring result according to monitoring device
Whether the controller 102 rotated according to preset rotation direction.And milling machine spindle operation control system also includes
The warning device of alarm is carried out when main shaft does not rotate according to preset rotation direction.Namely monitor
Device sends monitoring result to controller 102, and controller 102 is according to the testing result and pre-set programs
Judge when whether the direction of rotation of forward spindle is preset rotation direction, if it is, main shaft rotation is normal；
If not, main shaft rotation is abnormal, controller 102 sends abnormal signal to warning device, and then alarms
Device is alarmed, to point out operating personnel to carry out respective handling.By above-mentioned setting, in controller
102 by pre-set programs automatically control motion of main shaft carry out work pieces process when, can monitor in real time main shaft rotation
Whether normal turn, carry out alarm in time in unit exception, and then ensure that process is errorless,
Avoid the loss that unit exception is caused.
Specifically, warning device can be audible-visual annunciator or phonetic alarm.Pass through audible-visual annunciator
It can also remind operating personnel that processing is abnormal in noisy working environment, be easy to timely handled.
Operating personnel then can be directly reminded abnormal situation specifically occur using phonetic alarm, identification is high.
Certainly, other warning devices commonly used in the prior art can also be used as needed.
In order to be recorded to abnormal conditions, it is easy to later maintenance and the analysis of abnormal producing cause, control
Error message when device 102 processed can be also used for not rotating main shaft according to preset rotation direction is remembered
Record.Namely when whether controller 102 according to the monitoring result of monitoring device judges main shaft according to default rotation
Turn direction to rotate, if it is not, then by the monitoring result is labeled as error message and records.Thus, after
Phase can carry out corresponding analysis, to be debugged to system by reading the error message recorded.Tool
Body, to avoid committed memory excessive, it can be recorded by the cycle of preset time.
Further, the milling machine spindle operation control system that the present invention is provided can also include being used for basis
The monitoring result of monitoring device shows the display device of the direction of rotation of main shaft.Namely in monitoring device
When monitoring the direction of rotation of main shaft, monitoring result can be sent to controller 102, controller 102
Corresponding display information is sent to display device according to the testing result, to characterize main shaft direction of rotation.Tool
The display device of body can be display screen, and main shaft rotation results are entered by text information on a display screen
Row display.Main shaft rotation results can also be shown by image information or colouring information, it is such as main
Clockwise arrow is then shown when axle turns clockwise, spindle axis counterclockwise then shows counterclockwise arrow when rotating；
Or when main shaft turns clockwise display screen display green, and when spindle axis counterclockwise rotates display screen
Show red etc..
Specifically, controller 102 can be with reversing arrangement by wireless connection, to realize remote control.
And then operating personnel remotely can be controlled to main shaft, such as remote setting pre-set programs are carried out to workpiece
Processing etc..Controller 102 can also be sent the error signal of record to exchange database by GPS etc.
In, so as to the long-range read error information of engineer and it is analyzed.
Based on the milling machine spindle operation control system provided in above-described embodiment, present invention also offers one
Milling machine is planted, the milling machine includes any one milling machine spindle operation control system in above-described embodiment.Due to
The milling machine employs the milling machine spindle operation control system in above-described embodiment, so the milling machine is beneficial
Effect refer to above-described embodiment.Other each composition systems of milling machine, are such as used to cool down main shaft rotation generation
The cooling system of the spindle operation of heat, the frictional force for reducing main shaft rotation.Increase main shaft rotation
Lubricating system of speed etc. refer to prior art, and here is omitted.
The embodiment of each in this specification is described by the way of progressive, what each embodiment was stressed
All it is that identical similar portion is mutual referring to i.e. between the difference with other embodiment, each embodiment
Can.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or make
With the present invention.A variety of modifications to these embodiments will be aobvious for those skilled in the art
And be clear to, generic principles defined herein can not depart from the spirit or scope of the present invention
In the case of, realize in other embodiments.Therefore, the present invention is not intended to be limited to shown in this article
These embodiments, and be to fit to consistent with features of novelty with principles disclosed herein most wide
Scope.
Claims (10)
1. a kind of milling machine spindle operation control system, including energization produce magnetic field to drive main shaft
The main shaft coil of rotation and for the power supply to the main shaft coil input current；Characterized in that,
Also include being used to change the reversing arrangement of the electric current input direction of the main shaft coil and for controlling
The controller of the reversing arrangement, the reversing arrangement is connected to the main shaft coil and the electricity
It is electrically connected between source and with the controller.
2. milling machine spindle operation control system according to claim 1, it is characterised in that
The reversing arrangement is frequency converter, and the controller is connected to the main shaft coil and the frequency conversion
Between device.
3. milling machine spindle operation control system according to claim 1, it is characterised in that
Switch and counterclockwise switch, the switch connection clockwise clockwise are provided with the controller
Shi Suoshu controllers, which control the reversing arrangement to change the sense of current, makes the main shaft turn clockwise；
The controller, which controls the reversing arrangement to change the sense of current, during the counterclockwise switch connection makes
The spindle axis counterclockwise rotation.
4. the milling machine spindle operation control system according to claim any one of 1-3, it is special
Levy and be, the controller for can be controlled according to pre-set programs the main shaft turn clockwise or
The controller of rotate counterclockwise.
5. milling machine spindle operation control system according to claim 4, it is characterised in that
Also include being used for monitoring the monitoring device of the main shaft direction of rotation, the monitoring device with it is described
Controller is electrically connected with.
6. milling machine spindle operation control system according to claim 5, it is characterised in that
The controller is for judging whether the main shaft is pressed according to the monitoring result of the monitoring device
The controller rotated according to preset rotation direction, is additionally included in the main shaft not according to default rotation side
To the warning device that alarm is carried out during rotation.
7. milling machine spindle operation control system according to claim 6, it is characterised in that
The warning device is audible-visual annunciator or phonetic alarm.
8. milling machine spindle operation control system according to claim 5, it is characterised in that
The error message when main shaft is according to preset rotation direction for not rotated to for the controller
The controller recorded.
9. milling machine spindle operation control system according to claim 5, it is characterised in that
Also including the direction of rotation for showing the main shaft according to the monitoring result of the monitoring device
Display device.
10. a kind of milling machine, it is characterised in that including as described in claim any one of 1-9
Milling machine spindle operation control system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610137914.1A CN107175360B (en) | 2016-03-10 | 2016-03-10 | Milling machine and milling machine spindle operation control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610137914.1A CN107175360B (en) | 2016-03-10 | 2016-03-10 | Milling machine and milling machine spindle operation control system |
Publications (2)
| Publication Number | Publication Date |
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| CN107175360A true CN107175360A (en) | 2017-09-19 |
| CN107175360B CN107175360B (en) | 2019-07-26 |
Family
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610137914.1A Active CN107175360B (en) | 2016-03-10 | 2016-03-10 | Milling machine and milling machine spindle operation control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108391377A (en) * | 2018-03-06 | 2018-08-10 | 东莞森玛仕格里菲电路有限公司 | A kind of edges of boards electroplating bath goes burr manufacture craft |
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| CN101720173A (en) * | 2009-11-20 | 2010-06-02 | 深南电路有限公司 | Method for processing PCB |
| CN102271862A (en) * | 2009-01-14 | 2011-12-07 | 米凯特罗尼克有限公司 | Drilling head for printed circuit boards |
| CN102970834A (en) * | 2011-09-02 | 2013-03-13 | 悦虎电路(苏州)有限公司 | Method for fabricating circuit board metallized half hole |
| JP2013059818A (en) * | 2011-09-12 | 2013-04-04 | Shinetsu Fujitsu Kk | Method of machining printed circuit board |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63134102A (en) * | 1986-11-21 | 1988-06-06 | Mitsubishi Heavy Ind Ltd | Vibration preventing device for main spindle of machine tool |
| JP2008044073A (en) * | 2006-08-17 | 2008-02-28 | Okuma Corp | Main spindle braking device |
| CN101152674A (en) * | 2006-09-28 | 2008-04-02 | 日立比亚机械股份有限公司 | Figuration processing method |
| CN102271862A (en) * | 2009-01-14 | 2011-12-07 | 米凯特罗尼克有限公司 | Drilling head for printed circuit boards |
| CN101720173A (en) * | 2009-11-20 | 2010-06-02 | 深南电路有限公司 | Method for processing PCB |
| CN102970834A (en) * | 2011-09-02 | 2013-03-13 | 悦虎电路(苏州)有限公司 | Method for fabricating circuit board metallized half hole |
| JP2013059818A (en) * | 2011-09-12 | 2013-04-04 | Shinetsu Fujitsu Kk | Method of machining printed circuit board |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108391377A (en) * | 2018-03-06 | 2018-08-10 | 东莞森玛仕格里菲电路有限公司 | A kind of edges of boards electroplating bath goes burr manufacture craft |
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| Publication number | Publication date |
|---|---|
| CN107175360B (en) | 2019-07-26 |
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