CN108500694A - A kind of motor casing positional punch device - Google Patents
A kind of motor casing positional punch device Download PDFInfo
- Publication number
- CN108500694A CN108500694A CN201810362960.0A CN201810362960A CN108500694A CN 108500694 A CN108500694 A CN 108500694A CN 201810362960 A CN201810362960 A CN 201810362960A CN 108500694 A CN108500694 A CN 108500694A
- Authority
- CN
- China
- Prior art keywords
- positional punch
- backup pad
- casing
- motor
- clamping mold
- 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.)
- Pending
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
- B23Q3/08—Work-clamping means other than mechanically-actuated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
- B23Q5/22—Feeding members carrying tools or work
- B23Q5/34—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission
- B23Q5/38—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission feeding continuously
- B23Q5/40—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission feeding continuously by feed shaft, e.g. lead screw
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Press Drives And Press Lines (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Abstract
The invention discloses a kind of motor casing positional punch devices, including lifting frame mechanism, casing clamp system, positional punch mechanism and main control mechanism；Lifting frame mechanism includes upper backup pad, lower supporting plate and column, and hydraulic cylinder is also installed on lower supporting plate；Casing clamp system includes upper clamping mold, lower clamping mold and clamping cylinder, is connected by clamping cylinder between upper and lower clamping mold；Positional punch mechanism includes electric drill and lead screw motor, and lead screw motor is fixedly mounted on the end of upper backup pad；Electric drill is fixedly connected with the power output end of lead screw motor；Master controller is provided in control mechanism, lifting frame mechanism, casing clamp system and positional punch mechanism are connect with master controller by electric signal respectively；The technical problems such as the present invention is expensive for existing motor case positional punch apparatus cost, complicated, and positional punch is inaccurate are improved；The present invention has simple in structure, accurate positioning, punches fast and efficiently feature.
Description
Technical field
The present invention relates to motor production equipment field more particularly to a kind of motor casing positional punch devices.
Background technology
It is understood that motor casing is an important component of motor, motor casing is not only wanted to play
The effect for protecting motor inner components, also needs to have preferable heat-sinking capability, can in time generate casing internal
Outside heat transfer to casing, motor is avoided to be burnt out or the generation of enameled wire depainting phenomenon because heated.Moreover, motor exists
In order to allow electric motor operation to stablize in production process, the bottom of casing also need to installation one fixed seat and in order to
It enough allows casing to be sealed with drive end bearing bracket, rear end cap, is required for beating several holes on the shell of motor casing, these holes
For being fixedly connected with motor base and end cap.
Currently, most of motor casings are all using columnar structured, then mode manually carries out positional punch,
It is punched in this way, often casing easily rolls under the vibration of electric drill, it is difficult to be accurately positioned, while
It is difficult to ensure that working efficiency.Although present motor manufacturer also has part to be carried out by the way of mechanical punching, these machines
Or tool equipment involves great expense, it is not suitable for putting into operation for some micro-machines manufacturer；It still can be more or less
There is the inaccurate phenomenon of positioning.For this purpose, the present invention is directed to the above technical problem, a kind of motor casing positional punch dress is disclosed
It sets, the present invention has simple in structure, accurate positioning, punches fast and efficiently feature；Meanwhile the present apparatus can also according to wait beat
The motor casing shape in hole is different, and by carrying out the characteristics of die change can realize positional punch, the present apparatus is suitable for middle-size and small-size
Motor manufacturing enterprise promotes the use of.
Invention content
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of motor casing positional punch device,
Expensive to solve casing positional punch apparatus cost in the prior art, complicated, positional punch is inaccurate and manually beats
The technical problems such as hole is inefficient；
In order to solve the above technical problems, the invention discloses a kind of motor casing positional punch devices, including crane
Mechanism, casing clamp system, positional punch mechanism and main control mechanism；
Wherein, lifting frame mechanism includes upper backup pad, lower supporting plate and column, and column is fixedly mounted on lower supporting plate vertically
Plate face on, upper and lower support plate is opposite to be arranged in parallel, and through-hole is offered on upper backup pad, vertical axes are installed in through-hole
It holds, column is connect by running through vertical bearing with upper backup pad, and hydraulic cylinder is also installed on lower supporting plate, and hydraulic cylinder moves
Power output end is fixedly connected with upper backup pad；When work, hydraulic cylinder can drive upper backup pad to move up and down；
Casing clamp system is fixedly mounted on the top of lower supporting plate, and casing clamp system includes upper clamping mold, lower folder
Tight mold and clamping cylinder are connected by clamping cylinder between upper and lower clamping mold；When work, first casing to be punctured is put
It sets in the die cavity of upper and lower clamping mold, then starts clamping cylinder, casing is fixed with upper and lower clamping mold, is prevented
Casing is slided in punching；
Positional punch mechanism is fixedly mounted on the lower face of upper backup pad, and positional punch mechanism includes electric drill and lead screw electricity
Machine, lead screw motor are fixedly mounted on the end of upper backup pad；Electric drill is fixedly connected with the power output end of lead screw motor；Electric drill exists
It can move back and forth along the plate face of upper backup pad under the drive of lead screw motor；It is further opened with location hole on upper clamping mold, works
When, electric drill is that motor case to be processed punches by location hole；
Master controller, lifting frame mechanism, casing clamp system and positional punch mechanism difference are provided in main control mechanism
It is connect by electric signal with master controller.
Operation principle is first to be placed on casing to be punctured in the die cavity of upper and lower clamping mold, then master controller to
Clamping cylinder sends out instruction, and upper and lower clamping mold is molded to fix casing by clamping cylinder movement；Then master controller to
Positional punch mechanism sends out instruction, the electric drill progress located lateral after lead screw motor control startup, after located lateral, master controller
Work order is sent out to lifting frame mechanism, hydraulic cylinder starts, and drives upper backup pad to move downward, is punched to motor case；
After punching, each moving component playback waits for the punching of next motor casing；Master controller uses PLC programming Controls.
Further, in order to ensure the stability of upper backup pad movement and prevent from swinging, column is two, and two vertical
Column is fixed on the both ends of lower supporting plate vertically respectively.
Further, in order to preferably be convenient for the displacement of electric drill, ensure the stability of electric drill, the lower plate of upper backup pad
It is additionally provided with straight on face, the end set of electric drill has sliding block, sliding block to be fixedly mounted with straight, when work, electric drill
It can move back and forth along straight under the drive of lead screw motor.
Further, clamping mold causes to crush to casing in order to prevent, and preferably prevents casing from being sent out in punching
It is also respectively provided with improved mat in the die cavity of raw sliding, upper clamping mold and lower clamping mold.
Further, improved mat is the screwed rubber sheet gasket in surface.
Further, in order to preferably realize the positioning to motor case, ensure the uniform specification of casing punching, lower clamping
The end of mold is additionally provided with postive stop baffle, and the end face of postive stop baffle and lower clamping mold is arranged in parallel.
Further, in order to be suitable for various motor case punchings of different shapes, the die cavity of upper and lower clamping mold is
Semicircular structure or rectangular configuration so that the die cavity that mold is formed is identical as casing shape to be punctured, size.
The invention discloses a kind of motor casing positional punch devices, are made by the way that electric drill is carried out cooperation with lead screw motor
With the accuracy for substantially increasing punching positioning；Hold-down mechanism can prevent motor case from overturning, offset occurring in punching, this
Invention has simple in structure, accurate positioning, punches fast and efficiently feature；Meanwhile the present apparatus can also be according to electricity to be punctured
Casing shape is different, and by carrying out the characteristics of die change can realize positional punch, the present apparatus is given birth to suitable for middle and small motor
Production enterprise promotes the use of.
Description of the drawings
Fig. 1 is schematic structural view of the invention；
Fig. 2 is upper clamping mold inner-cavity structure schematic diagram.
Specific implementation mode
It elaborates below to the embodiment of the present invention, the present embodiment is carried out lower based on the technical solution of the present invention
Implement, gives detailed embodiment and specific operating process, but protection scope of the present invention is not limited to following implementation
Example.
Embodiment 1
Embodiment 1 discloses a kind of motor casing positional punch device, as shown in Figure 1, including lifting frame mechanism, casing
Clamp system, positional punch mechanism and main control mechanism 4；Wherein, lifting frame mechanism includes upper backup pad 11,12 and of lower supporting plate
Column 13, column 13 are fixedly mounted on vertically in the plate face of lower supporting plate 12, and upper backup pad 11 is relatively parallel with lower supporting plate 12
It is arranged, offers through-hole (being not marked in figure) on upper backup pad 11, vertical bearing 14 is installed in through-hole, column 13 passes through
It is connect with upper backup pad 11 through vertical bearing 14, hydraulic cylinder 15 is also installed on lower supporting plate 12, hydraulic cylinder 15 moves
Power output end is fixedly connected with upper backup pad 11；When work, hydraulic cylinder 15 can drive upper backup pad to move up and down；Its
In, the column 13 in the present embodiment is two, and two root posts 13 are fixed on the both ends of lower supporting plate 12 vertically respectively.Casing clamps
Mechanism is fixedly mounted on the top of lower supporting plate 12, and casing clamp system includes upper clamping mold 21, lower clamping mold 22 and folder
Tight cylinder 23, is connected between upper clamping mold 21 and lower clamping mold 22 by clamping cylinder 23；The end of lower clamping mold 22
It is additionally provided with postive stop baffle 26, postive stop baffle 26 and the end face of lower clamping mold 22 are arranged in parallel.Upper clamping mold 21 and lower folder
Improved mat 25 is also respectively provided in the die cavity of tight mold 22, improved mat 25 is the screwed rubber sheet gasket in surface.It is fixed
Position perforating mechanism is fixedly mounted on the lower face of upper backup pad 11, and positional punch mechanism includes electric drill 31 and lead screw motor 32,
Lead screw motor 32 is fixedly mounted on the end of upper backup pad 11；Electric drill 31 is fixedly connected with the power output end of lead screw motor 32；
Electric drill 31 can move back and forth under the drive of lead screw motor 32 along the lower face of upper backup pad 11；As shown in Fig. 2, upper clamping die
It is further opened with location hole 24 on tool 21, when work, electric drill 31 is that motor case to be processed punches by location hole 24；Main control
Master controller is provided in mechanism 4, lifting frame mechanism, casing clamp system and positional punch mechanism pass through with master controller respectively
Electric signal connects, and master controller is controlled using Siemens 6ES7216-2AD23-0XB8 type PLC programmable controllers；Upper branch
Straight 111 is additionally provided on the lower face of fagging 11, the end set of electric drill 31 has sliding block 311, sliding block 311 to be slided with straight line
Slot 111 is fixedly mounted, and when work, electric drill 31 can move back and forth under the drive of lead screw motor 32 along straight 111.This reality
The die cavity for applying upper clamping mold 21 and lower clamping mold 22 in example is semicircular structure.
Embodiment 2
Embodiment 2 discloses a kind of motor casing positional punch device, including lifting frame mechanism, casing clamp system,
Positional punch mechanism and main control mechanism 4；Wherein, lifting frame mechanism includes upper backup pad 11, lower supporting plate 12 and column 13, is stood
Column 13 is fixedly mounted on vertically in the plate face of lower supporting plate 12, and upper backup pad 11 and lower supporting plate 12 are arranged in parallel relatively, upper branch
Through-hole is offered on fagging 11, vertical bearing 14 is installed in through-hole, column 13 is by running through vertical bearing 14 and upper branch
Fagging 11 connects, and hydraulic cylinder 15, power output end and the upper backup pad 11 of hydraulic cylinder 15 are also installed on lower supporting plate 12
It is fixedly connected；When work, hydraulic cylinder 15 can drive upper backup pad to move up and down；Wherein, the column 13 in the present embodiment
It it is two, two root posts 13 are fixed on the both ends of lower supporting plate 12 vertically respectively.Casing clamp system is fixedly mounted on lower support
The top of plate 12, casing clamp system include upper clamping mold 21, lower clamping mold 22 and clamping cylinder 23, upper clamping mold 21
It is connected by clamping cylinder 23 between lower clamping mold 22；The end of lower clamping mold 22 is additionally provided with postive stop baffle 26, limit
Position baffle 26 and the end face of lower clamping mold 22 are arranged in parallel.Also distinguish in the die cavity of upper clamping mold 21 and lower clamping mold 22
It is provided with improved mat 25, improved mat 25 is the screwed silica gel pad in surface.Positional punch mechanism is fixedly mounted on
On the lower face of support plate 11, positional punch mechanism includes electric drill 31 and lead screw motor 32, and lead screw motor 32 is fixedly mounted on
The end of support plate 11；Electric drill 31 is fixedly connected with the power output end of lead screw motor 32；Band of the electric drill 31 in lead screw motor 32
It can move back and forth along the lower face of upper backup pad 11 under dynamic；It is further opened with location hole 24 on upper clamping mold 21, when work, electricity
It is that motor case to be processed punches that 31, which are bored, by location hole 24；Master controller, crane machine are provided in main control mechanism 4
Structure, casing clamp system and positional punch mechanism are connect with master controller by electric signal respectively, and master controller is programmed by PLC
It is controlled；Straight 111 is additionally provided on the lower face of upper backup pad 11, the end set of electric drill 31 has sliding block 311, sliding
Block 311 and straight 111 are fixedly mounted, and when work, electric drill 31 can be along straight 111 under the drive of lead screw motor 32
Move back and forth.The die cavity of upper clamping mold 21 and lower clamping mold 22 in the present embodiment is rectangular configuration.
Embodiment 3
Embodiment 3 discloses a kind of motor casing positional punch device, including lifting frame mechanism, casing clamp system,
Positional punch mechanism and main control mechanism 4；Wherein, lifting frame mechanism includes upper backup pad 11, lower supporting plate 12 and column 13, is stood
Column 13 is fixedly mounted on vertically in the plate face of lower supporting plate 12, and upper backup pad 11 and lower supporting plate 12 are arranged in parallel relatively, upper branch
Through-hole is offered on fagging 11, vertical bearing 14 is installed in through-hole, column 13 is by running through vertical bearing 14 and upper branch
Fagging 11 connects, and hydraulic cylinder 15, power output end and the upper backup pad 11 of hydraulic cylinder 15 are also installed on lower supporting plate 12
It is fixedly connected；When work, hydraulic cylinder 15 can drive upper backup pad to move up and down；Wherein, the column 13 in the present embodiment
It it is two, two root posts 13 are fixed on the both ends of lower supporting plate 12 vertically respectively.Casing clamp system is fixedly mounted on lower support
The top of plate 12, casing clamp system include upper clamping mold 21, lower clamping mold 22 and clamping cylinder 23, upper clamping mold 21
It is connected by clamping cylinder 23 between lower clamping mold 22；The end of lower clamping mold 22 is additionally provided with postive stop baffle 26, limit
Position baffle 26 and the end face of lower clamping mold 22 are arranged in parallel.Also distinguish in the die cavity of upper clamping mold 21 and lower clamping mold 22
It is provided with improved mat 25, improved mat 25 is the screwed silica gel pad in surface.Positional punch mechanism is fixedly mounted on
On the lower face of support plate 11, positional punch mechanism includes electric drill 31 and lead screw motor 32, and lead screw motor 32 is fixedly mounted on
The end of support plate 11；Electric drill 31 is fixedly connected with the power output end of lead screw motor 32；Band of the electric drill 31 in lead screw motor 32
It can move back and forth along the lower face of upper backup pad 11 under dynamic；It is further opened with location hole 24 on upper clamping mold 21, when work, electricity
It is that motor case to be processed punches that 31, which are bored, by location hole 24；Master controller, crane machine are provided in main control mechanism 4
Structure, casing clamp system and positional punch mechanism are connect with master controller by electric signal respectively, and master controller is programmed by PLC
It is controlled；Straight 111 is additionally provided on the lower face of upper backup pad 11, the end set of electric drill 31 has sliding block 311, sliding
Block 311 and straight 111 are fixedly mounted, and when work, electric drill 31 can be along straight 111 under the drive of lead screw motor 32
Move back and forth.The die cavity of upper clamping mold 21 and lower clamping mold 22 in the present embodiment is semicircular structure.
Claims (7)
1. a kind of motor casing positional punch device, which is characterized in that including lifting frame mechanism, casing clamp system, positioning
Perforating mechanism and main control mechanism；
Wherein, the lifting frame mechanism includes upper backup pad, lower supporting plate and column, and the column is fixedly mounted on described vertically
In the plate face of lower supporting plate, the upper and lower support plate is opposite to be arranged in parallel, and through-hole is offered on the upper backup pad, described logical
Vertical bearing is installed in hole, the column is connect by running through the vertical bearing with the upper backup pad, under described
Hydraulic cylinder is also installed in support plate, the power output end of the hydraulic cylinder is fixedly connected with the upper backup pad；
The casing clamp system is fixedly mounted on the top of the lower supporting plate, and the casing clamp system includes upper clamping die
Tool, lower clamping mold and clamping cylinder are connected by the clamping cylinder between the upper and lower clamping mold；
The positional punch mechanism is fixedly mounted on the lower face of the upper backup pad, and the positional punch mechanism includes electric drill
And lead screw motor, the lead screw motor are fixedly mounted on the end of the upper backup pad；The electric drill and the lead screw motor
Power output end is fixedly connected；The electric drill can move back under the drive of lead screw motor along the lower face of the upper backup pad
It is dynamic；It is further opened with location hole on the upper clamping mold, when work, the electric drill is motor to be processed by the location hole
Casing punches；
Master controller, the lifting frame mechanism, casing clamp system and positional punch mechanism are provided in the main control mechanism
It is connect respectively by electric signal with the master controller.
2. motor casing positional punch device as described in claim 1, which is characterized in that the column is two, two
The column is fixed on the both sides of the lower supporting plate vertically respectively.
3. motor casing positional punch device as described in claim 1, which is characterized in that the lower face of the upper backup pad
On be additionally provided with straight, the end set of the electric drill has sliding block, the sliding block to be fixedly mounted with the straight, work
When making, the electric drill can move back and forth under the drive of lead screw motor along the straight.
4. motor casing positional punch device as described in claim 1, which is characterized in that the upper clamping mold and lower folder
It is also respectively provided with improved mat in the die cavity of tight mold.
5. motor casing positional punch device as claimed in claim 4, which is characterized in that the improved mat is surface band
Threaded rubber sheet gasket.
6. motor casing positional punch device as described in claim 1, which is characterized in that the end of the lower clamping mold
It is additionally provided with postive stop baffle, the end face of the postive stop baffle and the lower clamping mold is arranged in parallel.
7. motor casing positional punch device as described in claim 1, which is characterized in that the upper and lower clamping mold
Die cavity is semicircular structure or rectangular configuration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810362960.0A CN108500694A (en) | 2018-04-21 | 2018-04-21 | A kind of motor casing positional punch device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810362960.0A CN108500694A (en) | 2018-04-21 | 2018-04-21 | A kind of motor casing positional punch device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108500694A true CN108500694A (en) | 2018-09-07 |
Family
ID=63382762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810362960.0A Pending CN108500694A (en) | 2018-04-21 | 2018-04-21 | A kind of motor casing positional punch device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108500694A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109434479A (en) * | 2018-12-26 | 2019-03-08 | 浙江飞宇自动化科技有限公司 | A kind of punching edge graphite machine |
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| JPH05208226A (en) * | 1992-01-30 | 1993-08-20 | Mitsubishi Shindoh Co Ltd | Continuous working device for strip metal |
| KR101027423B1 (en) * | 2009-04-16 | 2011-04-11 | 주식회사 로보스타 | Apparatus and method for drilling diesel particulate filter |
| CN203409315U (en) * | 2013-07-24 | 2014-01-29 | 芜湖中山科技有限公司 | Tool for drilling tangential hole in cylindrical workpiece |
| CN107052395A (en) * | 2017-03-21 | 2017-08-18 | 合肥智慧龙机械设计有限公司 | A kind of two-sided perforating device of turnover vehicle ring flange |
| CN107234267A (en) * | 2017-06-23 | 2017-10-10 | 芜湖仅机械有限公司 | A kind of borehole drill construction of the Full-automatic drilling production line of communication base station internal stent |
| CN206824695U (en) * | 2017-04-23 | 2018-01-02 | 马添翼 | Mobile phone shell rig is used in a kind of mobile phone production |
| CN207119819U (en) * | 2017-07-14 | 2018-03-20 | 新昌县鸿裕工业产品设计有限公司 | A kind of drilling equipment for motor case |
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2018
- 2018-04-21 CN CN201810362960.0A patent/CN108500694A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05208226A (en) * | 1992-01-30 | 1993-08-20 | Mitsubishi Shindoh Co Ltd | Continuous working device for strip metal |
| KR101027423B1 (en) * | 2009-04-16 | 2011-04-11 | 주식회사 로보스타 | Apparatus and method for drilling diesel particulate filter |
| CN203409315U (en) * | 2013-07-24 | 2014-01-29 | 芜湖中山科技有限公司 | Tool for drilling tangential hole in cylindrical workpiece |
| CN107052395A (en) * | 2017-03-21 | 2017-08-18 | 合肥智慧龙机械设计有限公司 | A kind of two-sided perforating device of turnover vehicle ring flange |
| CN206824695U (en) * | 2017-04-23 | 2018-01-02 | 马添翼 | Mobile phone shell rig is used in a kind of mobile phone production |
| CN107234267A (en) * | 2017-06-23 | 2017-10-10 | 芜湖仅机械有限公司 | A kind of borehole drill construction of the Full-automatic drilling production line of communication base station internal stent |
| CN207119819U (en) * | 2017-07-14 | 2018-03-20 | 新昌县鸿裕工业产品设计有限公司 | A kind of drilling equipment for motor case |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109434479A (en) * | 2018-12-26 | 2019-03-08 | 浙江飞宇自动化科技有限公司 | A kind of punching edge graphite machine |
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Application publication date: 20180907 |
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