CN104476366B - Sheet material automatic arch groove fluting apparatus continuously - Google Patents
Sheet material automatic arch groove fluting apparatus continuously Download PDFInfo
- Publication number
- CN104476366B CN104476366B CN201410807891.1A CN201410807891A CN104476366B CN 104476366 B CN104476366 B CN 104476366B CN 201410807891 A CN201410807891 A CN 201410807891A CN 104476366 B CN104476366 B CN 104476366B
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- CN
- China
- Prior art keywords
- sheet material
- hollow axle
- rotary sleeve
- telescopic shaft
- bistrique
- 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.)
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- 239000000463 material Substances 0.000 title claims abstract description 53
- 230000007246 mechanism Effects 0.000 claims abstract description 22
- 230000008859 change Effects 0.000 claims abstract description 21
- 238000003825 pressing Methods 0.000 claims abstract description 11
- 241001149930 Protura <class> Species 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 5
- 238000003754 machining Methods 0.000 abstract description 7
- 238000005498 polishing Methods 0.000 abstract description 5
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- 230000013011 mating Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
- B24B19/02—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/04—Headstocks; Working-spindles; Features relating thereto
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
- B24B47/12—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces by mechanical gearing or electric power
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/20—Drives or gearings; Equipment therefor relating to feed movement
Abstract
The invention provides a kind of sheet material automatic arch groove fluting apparatus continuously, including: frame, actuating unit, gear and grooving mechanism；Mounting platform and two bracing frames it are provided with in frame, the inner side on bracing frame top is provided with pressing plate and conveyer belt, forming guide groove between pressing plate and conveyer belt, gear includes hollow axle, cam disc and speed change assembly, and grooving mechanism includes rotary sleeve, telescopic shaft and bistrique.Gear introduces power by hollow axle, and the power that hollow axle introduces is under the mating reaction of cam disc and speed change assembly, enable to the rotary sleeve speed change in grooving mechanism rotate, so that bistrique can form pulsed polishing, reduce the phenomenon that bistrique occurs that idle running is dynamic, bistrique completes feed motion during rotating, being capable of Formation cross-section on sheet material is the groove of arc, realize improving the yield rate of sheet material automatic arch groove fluting apparatus continuously, reduce the labor intensity of workman and improve working (machining) efficiency.
Description
Technical field
The present invention relates to mechanical field, especially a kind of sheet material automatic arch groove fluting apparatus continuously.
Background technology
At present, for sheet material (plank, plastic plate or stone plate) slot treatment generally use groover to complete, and groover of the prior art is typically only capable to process the groove of straight line, for needing to process the particular/special requirement of annular groove on sheet material, slotted by artificial electric hand drill by needs, equipped with bistrique on electric drill, during being processed cannelure, operator need first to draw on sheet material the track of cannelure, then, by manually bistrique is directed at annular trace carries out grooving operations, in grooving process, the labor intensity of workman is very big and yield rate is relatively low, and, during for needing to process the groove that cross section is arc on sheet material, the bistrique of specific arc can only be used, its versatility is poor；Meanwhile, the rotating speed at bistrique keeps constant, the phenomenon that bistrique dallies in a groove easily occurs so that working (machining) efficiency is relatively low.How designing a kind of grooving apparatus that can reduce labor strength, raising yield rate, working (machining) efficiency and versatility is the technical problem to be solved.
Summary of the invention
The technical problem to be solved in the present invention is the deficiency overcoming above-mentioned prior art to exist, and a kind of sheet material automatic arch groove fluting apparatus continuously is proposed, realize improving yield rate, working (machining) efficiency and the versatility of sheet material arch groove grooving apparatus, and reduce the labor intensity of workman.
The present invention proposes a kind of sheet material automatic arch groove fluting apparatus continuously, including: frame, actuating unit, gear and grooving mechanism；Mounting platform and two bracing frames it are provided with in described frame, two support frames as described above are symmetrical arranged, the inner side on support frame as described above top is provided with pressing plate the most positioned opposite and conveyer belt, forming guide groove between described pressing plate and described conveyer belt, described mounting platform is between two support frames as described above；Described actuating unit includes the first motor and the second motor；Described gear includes hollow axle, cam disc and speed change assembly, described hollow axle is rotatably coupled on described mounting platform, described cam disc offers through hole, described hollow axle is inserted in described through hole, described cam disc is fixed on described mounting platform, described speed change assembly includes main turning arm, swing arm, connecting rod and speed-changing rotation arm, the one end of described main turning arm is fixed on described hollow axle, the other end of described main turning arm is hinged with the one end of described swing arm, the one end of described speed-changing rotation arm is rotatably coupled on described hollow axle, it is hinged with described connecting rod between described speed-changing rotation arm and described swing arm；Being provided with rotating pulley in described swing arm, described pulley is resisted against the edge of described cam disc, is provided with extension spring between end and described main turning arm that described swing arm is connected with described connecting rod, and described first motor is connected with described Hollow Shaft Transmission；Described grooving mechanism includes rotary sleeve, telescopic shaft and bistrique, the upper end of described telescopic shaft is conehead structure, described telescopic shaft is slidably connected in described rotary sleeve and described hollow axle, the top of described rotary sleeve is provided with mounting seat, the chute tilted upward is offered in described mounting seat, described chute slides and is provided with installing rack, described bistrique is removably attachable on described installing rack, it is additionally provided with the collar on described installing rack, the described collar is positioned at the top of described rotary sleeve, described rotary sleeve is fixed on described speed-changing rotation arm and is coaxially disposed with described hollow axle；The bottom of described telescopic shaft overhangs described hollow axle, the upper end of described telescopic shaft overhangs described rotary sleeve, the lower section of described mounting platform is additionally provided with rotating cam, and the bottom of described telescopic shaft is resisted against on described cam, and described second motor is connected with described cam drive.
Further, the bottom of described telescopic shaft is provided with rotating runner, and described runner is resisted against on described cam.
Further, the top of described rotary sleeve is additionally provided with auxiliary mounting seat, and described auxiliary mounting seat is provided with balance weight, and described auxiliary mounting seat is symmetrical arranged with described mounting seat.
Further, the end that described main turning arm is connected with described hollow axle is provided with extension rod, and described extension spring is connected with described extension rod.
Compared with prior art, the invention have the benefit that the sheet material automatic arch groove fluting apparatus continuously of the application, by arranging guide groove on bracing frame, guide groove location when sheet material is guided and slots, and the power of the first motor output drives the bistrique in grooving mechanism to rotate by gear, and gear introduces power by hollow axle, and the power that hollow axle introduces is under the mating reaction of cam disc and speed change assembly, enable to the rotary sleeve speed change in grooving mechanism rotate, so that bistrique can form pulsed polishing, reduce the phenomenon that bistrique occurs that idle running is dynamic；And grooving mechanism is driven the feeding realizing bistrique by the second motor, second motor is stretched relative to rotary sleeve by actuated by cams telescopic shaft, and during telescopic shaft stretches out, the conehead structure of telescopic shaft will go in the collar, and the sheet material making bistrique move closer to be positioned in guide groove carries out slot treatment, simultaneously, bistrique completes feed motion during rotating, being capable of Formation cross-section on sheet material is the groove of arc, realize improving the yield rate of sheet material automatic arch groove fluting apparatus continuously, reduce the labor intensity of workman and improve working (machining) efficiency.
Accompanying drawing explanation
Fig. 1 is that sheet material of the present invention automatic arch groove fluting apparatus embodiment continuously is in the structural representation under fluting state；
Fig. 2 is that sheet material of the present invention automatic arch groove fluting apparatus embodiment continuously is in the structural representation under unslotted state；
Fig. 3 is the structural representation of grooving mechanism in sheet material of the present invention automatic arch groove fluting apparatus embodiment continuously；
Fig. 4 is the axonometric chart of gear in sheet material of the present invention automatic arch groove fluting apparatus embodiment continuously；
Fig. 5 is the top view of gear in sheet material of the present invention automatic arch groove fluting apparatus embodiment continuously；
Fig. 6 is the upward view of gear in sheet material of the present invention automatic arch groove fluting apparatus embodiment continuously.
Detailed description of the invention
In order to further illustrate principle and the structure of the present invention, in conjunction with accompanying drawing to a preferred embodiment of the present invention will be described in detail.
As shown in figures 1 to 6, the present embodiment sheet material automatic arch groove fluting apparatus continuously, including: frame 1, actuating unit (not shown), gear 3 and grooving mechanism 2；Mounting platform 11 and two bracing frames 12 it are provided with in frame 1, two bracing frames 12 are symmetrical arranged, the inner side on bracing frame 12 top is provided with pressing plate 122 the most positioned opposite and conveyer belt 123, forming guide groove 121 between described pressing plate 122 and described conveyer belt 123, mounting platform 11 is between two bracing frames 12；Actuating unit includes the first motor (not shown) and the second motor (not shown).Preferably, so that sheet material can be positioned by conveyer belt 123 and pressing plate 122 reliably, avoid moving during cutting groove on sheet to improve fluting quality, can be provided with rotating rubber tire 1221 on pressing plate 122, rubber tire 1221 is positioned in guide groove 121, when sheet material is transmitted by conveyer belt 123, rubber tire 1221 will be squeezed on sheet material all the time, and when fluting, rubber tire 1221 can provide again effective support force to sheet material, it is ensured that the position reliability of sheet material.
Wherein, two bracing frames 12 of frame 1 are for supporting sheet material to be processed, and sheet material is when fluting, sheet material is inserted in guide groove 121 by operator, pressing plate 122 will provide downward support force to sheet material, to guarantee that sheet material is offset by polishing power when fluting, and conveyer belt 123 will be used for carrying sheet material and run, by controlling operation time and the transmission speed of conveyer belt 123, sheet material continuous way automatic slotting can be realized, grooving mechanism 2 for carrying out slot treatment to sheet material, and gear 3 is used for realizing grooving mechanism speed change fluting, and concrete structure is described as follows:
Gear 3 includes hollow axle 31, cam disc 32 and speed change assembly 33, hollow axle 31 is rotatably coupled on mounting platform 11, cam disc 32 offers through hole (not shown), hollow axle 31 is inserted in through-holes, cam disc 32 is fixed on mounting platform 11, speed change assembly 33 includes main turning arm 331, swing arm 332, connecting rod 333 and speed-changing rotation arm 334, the one end of main turning arm 331 is fixed on hollow axle 31, the other end of main turning arm 331 is hinged with the one end of swing arm 332, the one end of speed-changing rotation arm 334 is rotatably coupled on hollow axle 31, connecting rod 333 it is hinged with between speed-changing rotation arm 334 and swing arm 332；Being provided with rotating pulley 3321 in swing arm 332, pulley 3321 is resisted against the edge of cam disc 32, is provided with extension spring 335 between end and main turning arm 331 that swing arm 332 is connected with connecting rod 333, and the first motor is in transmission connection with hollow axle 31.Concrete, first motor drives hollow axle 31 to rotate, drive speed change assembly 33 is rotated by hollow axle 31 relative to cam disc 32, and in rotation process, pulley 3321 in swing arm 332 coordinates with cam disc 32, will realize being formed between speed-changing rotation arm 334 and main turning arm 331 speed difference, so that the bistrique 23 in grooving mechanism 2 can carry out speed change cutting, bistrique 23 is avoided the phenomenon skidded to occur, to improve working (machining) efficiency.Wherein, the end that main turning arm 331 is connected with hollow axle 31 is provided with extension rod 3311, and extension spring 335 is connected with extension rod 3311.Extension rod 3311 can increase the tensile elongation of extension spring 335, to improve the reset pulling force that swing arm 332 is applied by extension spring 335.It addition, connect dynamic input gear 311 on hollow axle 31, power input gear 311 is connected with the first motor-driven.Being coordinated with swing arm 332 by cam disc 32, to realize the speed change rotation of speed-changing rotation arm 334, overall structure is simple, and operational reliability is higher.Preferably, and on cam disc 32, it is additionally provided with bar hole 321, bar hole 321 is inserted with bolt (not shown), cam disc 32 is bolted on support, by reasonably arranging the position of cam disc 32, can control the bistrique 23 speed change on sheet material and position occurs, to meet the requirement to polishing dynamics of sheet material that different materials constituted, when needs regulation bistrique 23 speed change occurs position, the position of cam disc 32 can be adjusted with loose bolts, just can realize.
Grooving mechanism 2 includes rotary sleeve 21, telescopic shaft 22 and bistrique 23, the upper end of telescopic shaft 22 is conehead structure 221, telescopic shaft 22 is slidably connected in rotary sleeve 21 and hollow axle 31, the top of rotary sleeve 21 is provided with mounting seat 211, the chute 214 tilted upward is offered in mounting seat 211, chute 214 slides and is provided with installing rack 212, bistrique 23 is removably attachable on installing rack 212, the collar 213 it is additionally provided with on installing rack 212, the collar 213 is positioned at the top of rotary sleeve 21, and rotary sleeve 21 is fixed on speed-changing rotation arm 334 and is coaxially disposed with hollow axle 31；The bottom of telescopic shaft 22 overhangs hollow axle 31, and the upper end of telescopic shaft 22 overhangs rotary sleeve 21, and the lower section of mounting platform 11 is additionally provided with rotating cam 13, and the bottom of telescopic shaft 22 is resisted against on cam 13, and the second motor is in transmission connection with cam 13.Concrete, the rotary sleeve 21 of grooving mechanism 2 is arranged on speed-changing rotation arm 334 and realizes speed change rotation, in rotary sleeve 21 rotation process, now, installing rack 212 is slid in and out the tail end to chute 214 by centrifugal action along chute 214, and bistrique 23 will be located in the lower section of sheet material and do not contacts sheet material；Second motor drives cam 13 to rotate to drive telescopic shaft 22 to move up, the end making telescopic shaft 22 is inserted in the collar 213, owing to the end of telescopic shaft 22 is conehead structure, during telescopic shaft 22 is inserted into the collar 213, the collar 213 will gradually move to the direction near telescopic shaft 22 axis, so that installing rack 212 overcomes centrifugal force band rotary bistrique 23 to complete feed motion, and sheet material is cut while feed by bistrique 23, such that it is able to forming cross section is the annular groove of arc, by reasonably arranging setting angle and the height of bistrique 23, the processing request of the annular groove of different specification size can be met, versatility is stronger.For the grooving mechanism 2 in Fig. 1, telescopic shaft 22 is inserted in the collar 213, the axis of the collar 213 and the dead in line of telescopic shaft 22；For the grooving mechanism 2 in Fig. 2, telescopic shaft 22 is positioned at the outside of the collar 213, and the axis of the collar 213 is arranged in a crossed manner with the centrage of telescopic shaft 22.Preferably, being inserted into smoothly in the collar 213 for the ease of telescopic shaft 22, the collar 213 can use bearing, to reduce the frictional force between the collar 213 and telescopic shaft 22, it is ensured that bistrique 23 rotates smoothly.Wherein, the bottom of telescopic shaft 22 is provided with rotating runner 222, and runner 222 can reduce the frictional force between cam 13.It addition, the top of rotary sleeve 21 is additionally provided with auxiliary mounting seat 215, auxiliary mounting seat 215 being provided with balance weight 216, auxiliary mounting seat 215 is symmetrical arranged with mounting seat 211.Concrete, so that rotary sleeve 21 can rotate smoothly, auxiliary mounting seat 215 coordinates the centrifugal force that can balance mounting seat 211 with balance weight 216 so that rotary sleeve 21 can rotate more smoothly.
The sheet material of the application automatic arch groove fluting apparatus continuously, by arranging guide groove on bracing frame, guide groove location when sheet material is guided and slots, and the power of the first motor output drives the bistrique in grooving mechanism to rotate by gear, and gear introduces power by hollow axle, and the power that hollow axle introduces is under the mating reaction of cam disc and speed change assembly, enable to the rotary sleeve speed change in grooving mechanism rotate, so that bistrique can form pulsed polishing, reduce the phenomenon that bistrique occurs that idle running is dynamic；And grooving mechanism is driven the feeding realizing bistrique by the second motor, second motor is stretched relative to rotary sleeve by actuated by cams telescopic shaft, and during telescopic shaft stretches out, the conehead structure of telescopic shaft will go in the collar, and the sheet material making bistrique move closer to be positioned in guide groove carries out slot treatment, simultaneously, bistrique completes feed motion during rotating, being capable of Formation cross-section on sheet material is the groove of arc, realize improving the yield rate of sheet material automatic arch groove fluting apparatus continuously, reduce the labor intensity of workman and improve working (machining) efficiency.
These are only the preferable possible embodiments of the present invention, not limit the scope of the invention.Equivalent structure change done by all utilization description of the invention and accompanying drawing content, is all contained in protection scope of the present invention.
Claims (4)
1. a sheet material automatic arch groove fluting apparatus continuously, it is characterised in that including: frame, actuating unit, gear and grooving mechanism；Mounting platform and two bracing frames it are provided with in described frame, two support frames as described above are symmetrical arranged, the inner side on support frame as described above top is provided with pressing plate the most positioned opposite and conveyer belt, forming guide groove between described pressing plate and described conveyer belt, described mounting platform is between two support frames as described above；Described actuating unit includes the first motor and the second motor；Described gear includes hollow axle, cam disc and speed change assembly, described hollow axle is rotatably coupled on described mounting platform, described cam disc offers through hole, described hollow axle is inserted in described through hole, described cam disc is fixed on described mounting platform, described speed change assembly includes main turning arm, swing arm, connecting rod and speed-changing rotation arm, the one end of described main turning arm is fixed on described hollow axle, the other end of described main turning arm is hinged with the one end of described swing arm, the one end of described speed-changing rotation arm is rotatably coupled on described hollow axle, it is hinged with described connecting rod between described speed-changing rotation arm and described swing arm；Being provided with rotating pulley in described swing arm, described pulley is resisted against the edge of described cam disc, is provided with extension spring between end and described main turning arm that described swing arm is connected with described connecting rod, and described first motor is connected with described Hollow Shaft Transmission；Described grooving mechanism includes rotary sleeve, telescopic shaft and bistrique, the upper end of described telescopic shaft is conehead structure, described telescopic shaft is slidably connected in described rotary sleeve and described hollow axle, the top of described rotary sleeve is provided with mounting seat, the chute tilted upward is offered in described mounting seat, described chute slides and is provided with installing rack, described bistrique is removably attachable on described installing rack, it is additionally provided with the collar on described installing rack, the described collar is positioned at the top of described rotary sleeve, described rotary sleeve is fixed on described speed-changing rotation arm and is coaxially disposed with described hollow axle；The bottom of described telescopic shaft overhangs described hollow axle, the upper end of described telescopic shaft overhangs described rotary sleeve, the lower section of described mounting platform is additionally provided with rotating cam, and the bottom of described telescopic shaft is resisted against on described cam, and described second motor is connected with described cam drive.
Sheet material the most according to claim 1 automatic arch groove fluting apparatus continuously, it is characterised in that the bottom of described telescopic shaft is provided with rotating runner, and described runner is resisted against on described cam.
Sheet material the most according to claim 1 automatic arch groove fluting apparatus continuously, it is characterised in that the top of described rotary sleeve is additionally provided with auxiliary mounting seat, and described auxiliary mounting seat is provided with balance weight, and described auxiliary mounting seat is symmetrical arranged with described mounting seat.
Sheet material the most according to claim 1 automatic arch groove fluting apparatus continuously, it is characterised in that the end that described main turning arm is connected with described hollow axle is provided with extension rod, and described extension spring is connected with described extension rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410807891.1A CN104476366B (en) | 2014-12-23 | 2014-12-23 | Sheet material automatic arch groove fluting apparatus continuously |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410807891.1A CN104476366B (en) | 2014-12-23 | 2014-12-23 | Sheet material automatic arch groove fluting apparatus continuously |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104476366A CN104476366A (en) | 2015-04-01 |
| CN104476366B true CN104476366B (en) | 2016-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410807891.1A Active CN104476366B (en) | 2014-12-23 | 2014-12-23 | Sheet material automatic arch groove fluting apparatus continuously |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110434706B (en) * | 2019-08-14 | 2020-04-17 | 浙江振华精锻齿轮股份有限公司 | Gear production and manufacturing finish machining processing system and method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002292560A (en) * | 2001-03-29 | 2002-10-08 | Toyo Advanced Technologies Co Ltd | Grinding method and device therefor |
| CN201009147Y (en) * | 2007-03-20 | 2008-01-23 | 广东高新凯特精密机械有限公司 | Grinding device of sliding block internal groove for machining rail pair |
| JP2009050927A (en) * | 2007-08-24 | 2009-03-12 | Jtekt Corp | Grinder |
| CN201338225Y (en) * | 2009-01-23 | 2009-11-04 | 沈阳黎发热能燃机设备配件有限公司 | Tooling of arc grinding notch |
| CN201405248Y (en) * | 2009-06-15 | 2010-02-17 | 浙江省能源研究所 | Groove cutting machine with quartz nozzle |
| CN203197383U (en) * | 2013-05-03 | 2013-09-18 | 张玉宝 | Construction and decoration board slotted hole forming device, saw blade and board obtained through machining |
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| CN104476366A (en) | 2015-04-01 |
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