CN108838414A - A kind of eccentric adjustable depth blind hole precision boring cutter holder device - Google Patents
A kind of eccentric adjustable depth blind hole precision boring cutter holder device Download PDFInfo
- Publication number
- CN108838414A CN108838414A CN201810622968.6A CN201810622968A CN108838414A CN 108838414 A CN108838414 A CN 108838414A CN 201810622968 A CN201810622968 A CN 201810622968A CN 108838414 A CN108838414 A CN 108838414A
- Authority
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- China
- Prior art keywords
- outer sleeve
- cavity
- blind hole
- boring cutter
- holder device
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B29/00—Holders for non-rotary cutting tools; Boring bars or boring heads; Accessories for tool holders
- B23B29/02—Boring bars
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling And Boring (AREA)
Abstract
The invention discloses a kind of eccentric adjustable depth blind hole precision boring cutter holder devices, including outer sleeve, knife bar combination, lance combination and driving box, the technical program uses lance combination and combines the eccentric structure principle combined with knife bar, realize that the linear motion of lance combination drives the rotary motion of knife bar combination by lead screw fit helicla flute, and then effectively realize the molding cavity processing of the screw thread, arc or taper of workpiece, mold cavity is met greater than straight hole or the work pieces process needs of entrance opening dimension；Meanwhile the linear motion stroke of straight pipe is controlled by driving box, and then controllable place eccentric position of the cutter relative to outer sleeve, and then can easily realize the adjusting of the eccentricity of cutter, and it is easy to operate, it is easy to use, meet the use needs of complicated processing environment；And have the characteristics that simple in construction, easy to disassemble and assemble low with manufacturing cost, it is suitable for popularization and application.
Description
Technical field
The present invention relates to cutting tool for CNC machine technical field, specifically a kind of eccentric adjustable depth blind hole precision boring cutter holder dress
It sets.
Background technique
The processing of deep blind hole is a problem of field of machining, especially progress hole inner arc, the cavitys such as taper and
The machine-shaping of screw thread is difficult to realize.In the process of taper arc blind hole, since blind hole is relatively deep, root shape is complicated and
The factors such as entrance opening dimension is smaller, cause traditional lathe and deep hole drilling and boring machine not to have processing conditions, can not process and portal
Shape and size.Common practice is to be processed on deep hole drilling and boring machine using forming flat drill.Since the forming flat drill manufacturing cycle is long,
Costly, process is easy to forge a knife, and requires height to operator's level of skill, and processing quality is not easy to guarantee.
Notification number for the utility model patent of CN 204221023U provide it is a kind of can be used on numerically controlled lathe be used for
The boring cutter lever apparatus of taper arc blind hole is processed, including boring cutter bar, boring cutter bar include push type broach part, anti-interference part and numerical control
The clamping part and the counterweight part for preventing knife bar from vibrating that numerically-controlled slide is connected on lathe, boring cutter bar is arranged in push type broach part
Front end, push type broach part front end offer the cutter groove of installation cutter head, and the cutter groove is located on the outside of boring cutter bar, and direction and
Boring cutter rod axis is parallel, and the cutter head is vertically mounted in the cutter groove.The utility model can realize taper arc blind hole
Processing.
But the boring cutter lever apparatus of above-mentioned technical proposal exists：The device is adapted only to processed taper arc part less than blind hole
Cavity namely the machine-shaping position be less than blind hole straight hole section bore or entrance opening dimension, when needing to process and compare straight hole
When the bigger taper arc-shaped cavity of bore of section, then it cannot achieve, meanwhile, according to the setting structure feature and entirety of the boring cutter bar
Organization plan is not suitable for the processing of deeper blind hole.
Notification number is that the utility model patent of CN 201309007Y discloses a kind of eccentric accurate adjustment deep blind hole precision boring cutter holder dress
It sets comprising the long boring cutter bar in right angle, bias are located by connecting set, anti-turn screw and rimmer knife rod handle, and the bias set that is located by connecting is covered straight
One end of angular length boring cutter bar, rimmer knife rod handle are fixedly connected by anti-turn screw and the long boring cutter bar in right angle, the bias set that is located by connecting, should
The processing that utility model is able to satisfy steel box casting depth blind hole uses.
But the boring cutter lever apparatus of above-mentioned technical proposal exists：The device is carried out by be located by connecting set and anti-turn screw of bias
Fixed, bias positioning avoids tradition from adjusting the inconvenience of cutter head or changing knife rod, but not only for the eccentricity convenient for adjusting cutter head
Mold cavity is able to achieve greater than straight hole or the work pieces process of entrance opening dimension.
Summary of the invention
In order to solve the above technical problems, the purpose of the present invention is to provide a kind of eccentric adjustable depth blind hole precision boring cutter holder dresses
It sets, the eccentric structure principle combined is combined with knife bar using lance combination, lance is realized by lead screw fit helicla flute
The linear motion of combination drives the rotary motion of knife bar combination, and then effectively realizes the molding of the screw thread, arc or taper of workpiece
Cavity processing meets mold cavity greater than straight hole or the work pieces process needs of entrance opening dimension.
In order to achieve the above objectives, technical scheme is as follows：
A kind of eccentric adjustable depth blind hole precision boring cutter holder device, including the combination of outer sleeve, knife bar, lance combination and driving
There is interconnected and the first cavity of out-of-alignment and the second cavity, second cavity to be located at outer sleeve for case, the outer sleeve
Back segment and coaxial with outer sleeve；
The connection that the knife bar combination includes drive rod, drive rod front end is arranged in and matches with the oral area of the first cavity
Portion, the tool apron for being arranged on interconnecting piece and being located at outside the first cavity and it is arranged on tool apron for installing the blade harrow of cutter, institute
Drive rod is stated equipped with helicla flute, the interconnecting piece is equipped with annular groove, and the outer sleeve is equipped with corresponding with annular groove
The front end of positioning screw, the positioning screw extends into annular groove, the cutter head direction of the cutter and the axial phase of outer sleeve
Vertically；
The lance combines the straight pipe for including the lead segment being adapted with the first cavity and being adapted with the second cavity,
The lead segment has the cavity being slidably matched with drive rod, and the lead segment is simultaneously close to lead segment front end and radial along lead segment
It is threaded with lead screw, the front end of the lead screw extends into helicla flute, and the rear end of the straight pipe connects driving
Case is provided with through-hole corresponding with lead screw in the outer sleeve wall of first cavity；
When work, driving box drives lance combination axially for linear motion along outer sleeve, and then makes lead screw along spiral
Slot drives drive rod for the helical movement, to realize that cutter makees eccentric rotational motion around outer sleeve axis.
Further, the outer wall of the outer sleeve and close housing tube rear end is equipped with the first pin hole, the straight pipe
Outer wall is equipped with the second pin hole, when in the straight hole to be processed for entering workpiece, by fixed pin through the first pin hole and insertion the
In two pin holes, so that outer sleeve combines the straight hole to be processed for entering workpiece together together with lance, before being processed, further take out solid
Rationed marketing.
Further, the straight pipe and it is located at the outer wall of the second pin hole and along straight pipe is axially arranged with strip grooves, institute
It states outer sleeve and is equipped with stop screw close to the wall of housing tube rear end, when installation, the front end of the stop screw extends into length
In bar groove.
Further, the blade harrow includes being mounted on the outer end face of interconnecting piece and in block-like ontology, and the one of the ontology
End is equipped with the cutter groove for installing cutter.
Further, the straight pipe and close to straight pipe rear end outer wall be equipped with scale label, the scale label
Axially it is arranged along straight pipe.
Further, through-hole corresponding with lead screw is provided in the outer sleeve wall of first cavity.
Further, the section of the helicla flute is rectangular.
Further, the helix angle of the helicla flute is 12-18 degree, lead 0.5-0.7m.
Further, second cavity is slidably matched with straight pipe.
Further, first cavity is slidably matched with lead segment, and cavity and the drive rod sliding of the lead segment are matched
It closes.
A kind of beneficial effect of eccentric adjustable depth blind hole precision boring cutter holder device of the present invention：
1, the eccentric structure principle combined is combined with knife bar using lance combination, it is real by lead screw fit helicla flute
The linear motion of existing lance combination drives the rotary motion of knife bar combination, and then effectively realizes the screw thread, arc or taper of workpiece
Molding cavity processing, meet work pieces process needs of the mold cavity greater than straight hole or entrance opening dimension.
2, the linear motion stroke of straight pipe, and then controllable place of the cutter relative to outer sleeve are controlled by driving box
Eccentric position, and then can easily realize the adjusting of the eccentricity of cutter, it is easy to operate, it is easy to use, meet complicated processing environment
Use need；
3, primary structure is combined to combine with knife bar and be constituted by outer sleeve, lance, has simple in construction, easy to disassemble and assemble and manufacture
Feature at low cost, is suitable for popularization and application.
Detailed description of the invention
Fig. 1 is a kind of mounting structure schematic diagram of eccentric adjustable depth blind hole precision boring cutter holder device of the present invention；
Fig. 2 is outer sleeve structure schematic diagram of the invention；
Fig. 3 is lance combining structure schematic diagram of the invention；
Fig. 4 is knife bar combining structure schematic diagram of the invention；
Fig. 5 is helicla flute expanded schematic diagram of the invention；
Fig. 6 is 0 degree of status diagram of blade harrow of the invention；
Fig. 7 is 90 degree of status diagrams of blade harrow of the invention；
Fig. 8 is blade harrow 180 degree schematic diagram of the invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention more comprehensible, below in conjunction with attached drawing, to the present invention make into
One step is described in detail.
It should be noted that unless otherwise indicated, technical term or scientific term used in this application should be this hair
The ordinary meaning that bright one of ordinary skill in the art are understood.
In the description of the present application, it is to be understood that the orientation or positional relationship of the instructions such as term "front", "rear" is base
In attached orientation or positional relationship shown in FIG. 1, it is merely for convenience of description of the present invention and simplification of the description, rather than indication or suggestion
Signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as to this
The limitation of invention.
As shown in figures 1-8, a kind of eccentric adjustable depth blind hole precision boring cutter holder device, including outer sleeve 1, knife bar combine 2, hit
Bar combination 3 and driving box 4, the outer sleeve have interconnected and out-of-alignment the first cavity 11 and the second cavity 12, institute
State the second cavity be located at outer sleeve back segment and with outer sleeve is coaxial namely the first cavity and outer sleeve it is not coaxial, the first cavity
Corresponding outer sleeve is eccentric；
The company that the knife bar combination includes drive rod 21, drive rod front end is arranged in and matches with the oral area of the first cavity
Socket part 22, the tool apron 23 for being arranged on interconnecting piece and being located at outside the first cavity and it is arranged on tool apron for installing the knife of cutter
Rake 24, the drive rod are equipped with helicla flute 211, it is preferred that the helix angle of the helicla flute is 12-18 degree, and lead is
0.5-0.7m, such as 0.56m, 0.6m, 0.62m etc. meet the straight line push of driving box or reel stroke needs, can also be conducive to lead
Journey screw is moved along helicla flute, and then realizes the rotary motion of drive rod, and the lead and helix angle of helicla flute can bases
Practical application optimizes setting；The interconnecting piece is equipped with annular groove 221, and the outer sleeve is equipped with corresponding with annular groove
Positioning screw 13, the front end of the positioning screw extends into annular groove, and positioning screw can play the work of the positioning to interconnecting piece
With, the rotation function needs of interconnecting piece can be met with annular engagement, drive rod is also can avoid and is detached from the first cavity, the cutter
The axial direction of cutter head direction and outer sleeve is perpendicular, and the hinged bolt fixed form of cutter is managed in combination with existing mature technology means
Solution, the development length of cutter head or away from drive rod distance of shaft centers need to according to actual processing need be adjusted；
The lance combination includes the lead segment 31 being adapted with the first cavity and the straight tube adaptable with the second cavity
Section 32, the lead segment has the cavity 311 being slidably matched with drive rod, the lead segment and close lead segment front end and edge is led
Draw section and be radially threaded with lead screw 33, the front end of the lead screw extends into helicla flute, it is preferred that the spiral
The section of slot is rectangular, and rectangular-shaped spiral channel section is conducive to cooperate with the front end of lead screw；After the straight pipe
End connection driving box, driving box play the role of the pull to straight pipe, realize the linear motion of straight pipe, are being located at described first
It is provided with through-hole 14 corresponding with lead screw in the outer sleeve wall of cavity, through-hole is set, tearing open for lead screw can be easy to implement
Dress；
When work, driving box drives lance combination axially for linear motion along outer sleeve, and then makes lead screw along spiral
Slot drives drive rod for the helical movement, to realize that cutter makees eccentric rotational motion around outer sleeve axis.
A kind of working principle of eccentric adjustable depth blind hole precision boring cutter holder device of above-mentioned technical proposal：
First workpiece 5 is fixedly mounted in the processing shaft of numerically-controlled machine tool, the hindfoot portion of outer sleeve is put into drawing for lathe
On the knife rest of hole, the straight pipe rear end installation of lance combination is connected on the power output end of driving box, lead segment and the first cavity
In place, lead screw fit extends into helicla flute for cooperation, and positioning screw cooperation extends into annular groove, and cutter adjustment installation is extremely
The cutter head of the size positions of setting namely cutter along outer sleeve axial direction extension size, then by outer sleeve along the straight hole axis of workpiece
To entering station to be added；When work, workpiece uniform rotation under the control of numerically-controlled machine tool, driving box driving straight pipe makees straight line
Movement, lead screw can be moved along helicla flute, and drive rod is for the helical movement in the case where the spiral of helicla flute drives, and then realizes knife
Tool rotates around drive rod axle center, due to the first cavity and outer sleeve be not coaxial namely drive rod and outer sleeve it is not coaxial,
To realize that cutter makees eccentric rotational motion around outer sleeve axle center, it is to be understood that meet processing of the cutter to workpiece
It needs, the revolving speed of cutter carries out cooperation adjustment according to the precision of actual processing, and the revolving speed of cutter depends on the lead of helicla flute
With the push-and-pull speed of helix angle and driving box, when practical operation, lead and the helix angle of helicla flute are fixed and invariable,
It only needs to control the push-and-pull speed of driving box, therefore, straight pipe back and forth sliding axially along outer sleeve is controlled by driving box,
The position of i.e. changeable cutter is calculated through association as shown in figs 6-8, the eccentric position of you can get it cutter exceeds outer sleeve
It sets, and then realizes cutter in the position change of the straight hole difference eccentricity relative to workpiece, to pass through the bias for adjusting cutter
Away from position and velocity of rotation, realizes the molding cavity processing of workpiece difference screw thread, arc or taper, meet mold cavity and be greater than directly
The work pieces process of hole or entrance opening dimension needs.
As a kind of preferred technical solution, the outer sleeve and the first pin hole is equipped with close to the outer wall of housing tube rear end
15, the outer wall of the straight pipe is equipped with the second pin hole 321, when in the straight hole to be processed for entering workpiece, is passed through by fixed pin
It wears in the first pin hole and the second pin hole of insertion, so that outer sleeve combines the straight hole to be processed for entering workpiece together together with lance,
Before being processed, fixed pin is further taken out, and then can guarantee that the smooth and safety of outer sleeve connection lance combination enters the straight of workpiece
It in hole, avoids moving forward the lead screw of lead segment during pushing straight pipe to enter, causes drive rod band cutter
The case where generating rotation can be taken off fixed pin after cutter enters station to be added, when processing exits outer sleeve,
Repeatable above-mentioned steps, by fixed pin again insertable into guarantee the safety of operation.
As a kind of preferred technical solution, the straight pipe is simultaneously located at the outer wall of the second pin hole and axial along straight pipe
Equipped with strip grooves 322, the outer sleeve and stop screw 16, when installation, the limit are equipped with close to the wall of housing tube rear end
The front end of screw extends into strip grooves, and then can limit the shift motion of straight pipe, and the specific length of strip grooves can be according to reality
Border is set.
As a kind of preferred technical solution, the blade harrow includes being mounted on the outer end face of interconnecting piece and in block-like
Body, one end of the ontology are equipped with the cutter groove 241 for installing cutter, and cutter is put into cutter groove by when installation, and passes through bolt
Fastening, it is to be understood that the direction of cutter groove is radially extended towards drive rod, can be by changing installation position of the cutter in cutter groove
It sets, and then adjusts the development length of cutter.
As a kind of preferred technical solution, the straight pipe and scale label is equipped with close to the outer wall of straight pipe rear end
323, the scale label is axially arranged along straight pipe, and setting scale label can check convenient for operator and judge the institute of cutter
It is controlled in position, and then convenient for the operation to driving box.
As a kind of preferred technical solution, second cavity is slidably matched with straight pipe, first cavity with lead
Draw section to be slidably matched, cavity and the drive rod of the lead segment are slidably matched, to meet the realization of lead screw fit helicla flute
The linear motion of lance combination drives the design function of the rotary motion of knife bar combination to need, and fit clearance is according to actual production
Material and technique are specifically set.
Above explanation and examples are merely exemplary, it is not intended to limit the scope of the present invention in any way.This field
Technical staff should be understood that without departing from the spirit and scope of the invention can details and shape to inventive technique scheme
Formula is modified or is replaced, but these modifications and replacement are fallen within the protection scope of the present invention.
Claims (9)
1. a kind of eccentric adjustable depth blind hole precision boring cutter holder device, including outer sleeve (1), knife bar combination (2), lance combination (3)
And driving box (4), it is characterised in that：The outer sleeve has interconnected and the first cavity of out-of-alignment (11) empty with second
Chamber (12), second cavity are located at the back segment of outer sleeve and coaxial with outer sleeve；
Knife bar combination include drive rod (21), drive rod front end is set and is matched with the oral area of the first cavity connection
Portion (22), the tool apron (23) for being arranged on interconnecting piece and being located at outside the first cavity and it is arranged on tool apron for installing cutter
Blade harrow (24), the drive rod are equipped with helicla flute (211), and the interconnecting piece is equipped with annular groove (221), on the outer sleeve
Equipped with positioning screw (13) corresponding with annular groove, the front end of the positioning screw is extended into annular groove, the cutter
The axial direction of cutter head direction and outer sleeve is perpendicular；
The lance combination includes the lead segment (31) being adapted with the first cavity and the straight pipe adaptable with the second cavity
(32), the lead segment has the cavity (311) being slidably matched with drive rod, the lead segment and close lead segment front end and edge
Lead segment is radially threaded with lead screw (33), and the front end of the lead screw extends into helicla flute, the straight pipe
Rear end connect driving box, through-hole (14) corresponding with lead screw is provided in the outer sleeve wall of first cavity；
When work, driving box drives lance combination axially for linear motion along outer sleeve, and then makes lead screw along helicla flute band
Dynamic drive rod is for the helical movement, to realize that cutter makees eccentric rotational motion around outer sleeve axis.
2. a kind of eccentric adjustable depth blind hole precision boring cutter holder device according to claim 1, it is characterised in that：The housing
The outer wall of cylinder and close housing tube rear end is equipped with the first pin hole (15), and the outer wall of the straight pipe is equipped with the second pin hole
(321), when in the straight hole to be processed for entering workpiece, through fixed pin in the first pin hole and the second pin hole of insertion, so that
Outer sleeve combines together with lance and further takes out fixed pin before being processed into the straight hole to be processed of workpiece together.
3. a kind of eccentric adjustable depth blind hole precision boring cutter holder device according to claim 1, it is characterised in that：The straight tube
Section is simultaneously located at the outer wall of the second pin hole and is axially arranged with strip grooves (322) along straight pipe, the outer sleeve and close outer sleeve
The wall of rear end is equipped with stop screw (16), and when installation, the front end of the stop screw is extended into strip grooves.
4. a kind of eccentric adjustable depth blind hole precision boring cutter holder device according to claim 1, it is characterised in that：The blade harrow
Including being mounted on the outer end face of interconnecting piece and in block-like ontology, one end of the ontology is equipped with the cutter groove for installing cutter
(241)。
5. a kind of eccentric adjustable depth blind hole precision boring cutter holder device according to claim 1, it is characterised in that：The straight tube
The outer wall of section and close straight pipe rear end is equipped with scale label (323), and the scale label is axially arranged along straight pipe.
6. a kind of eccentric adjustable depth blind hole precision boring cutter holder device according to claim 1, it is characterised in that：The spiral
The section of slot is rectangular.
7. a kind of eccentric adjustable depth blind hole precision boring cutter holder device according to claim 1, it is characterised in that：The spiral
The helix angle of slot is 12-18 degree, lead 0.5-0.7m.
8. a kind of eccentric adjustable depth blind hole precision boring cutter holder device according to claim 1-7, it is characterised in that：
Second cavity is slidably matched with straight pipe.
9. a kind of eccentric adjustable depth blind hole precision boring cutter holder device according to claim 8, it is characterised in that：Described first
Cavity is slidably matched with lead segment, and cavity and the drive rod of the lead segment are slidably matched.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810622968.6A CN108838414A (en) | 2018-06-15 | 2018-06-15 | A kind of eccentric adjustable depth blind hole precision boring cutter holder device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810622968.6A CN108838414A (en) | 2018-06-15 | 2018-06-15 | A kind of eccentric adjustable depth blind hole precision boring cutter holder device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108838414A true CN108838414A (en) | 2018-11-20 |
Family
ID=64202110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810622968.6A Pending CN108838414A (en) | 2018-06-15 | 2018-06-15 | A kind of eccentric adjustable depth blind hole precision boring cutter holder device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108838414A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111321406A (en) * | 2018-12-15 | 2020-06-23 | 兰州交通大学 | Electric spark deposition mechanism for functional coating on inner wall of long and thin pipeline |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2427855A (en) * | 1945-09-10 | 1947-09-23 | Magnus A Grunlan | Eccentric boring tool with means for boring tapers |
| US3466955A (en) * | 1967-05-17 | 1969-09-16 | Carmet Co | Tool holder |
| CN1103613A (en) * | 1994-01-01 | 1995-06-14 | 张剑 | Slot-boring tool |
| CN2642437Y (en) * | 2003-09-08 | 2004-09-22 | 青岛地恩地机电科技股份有限公司 | Cutting tool special for cutting annular inner hole |
| CN1775432A (en) * | 2005-11-21 | 2006-05-24 | 青岛地恩地机电科技股份有限公司 | Grooving tool |
| CN201309007Y (en) * | 2009-04-24 | 2009-09-16 | 上海良工阀门厂有限公司 | Eccentric accurate adjustment deep blind hole precision boring cutter holder device |
| CN106541160A (en) * | 2016-12-07 | 2017-03-29 | 北京北方车辆集团有限公司 | A kind of rotatable radial expansion cutter |
-
2018
- 2018-06-15 CN CN201810622968.6A patent/CN108838414A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2427855A (en) * | 1945-09-10 | 1947-09-23 | Magnus A Grunlan | Eccentric boring tool with means for boring tapers |
| US3466955A (en) * | 1967-05-17 | 1969-09-16 | Carmet Co | Tool holder |
| CN1103613A (en) * | 1994-01-01 | 1995-06-14 | 张剑 | Slot-boring tool |
| CN2642437Y (en) * | 2003-09-08 | 2004-09-22 | 青岛地恩地机电科技股份有限公司 | Cutting tool special for cutting annular inner hole |
| CN1775432A (en) * | 2005-11-21 | 2006-05-24 | 青岛地恩地机电科技股份有限公司 | Grooving tool |
| CN201309007Y (en) * | 2009-04-24 | 2009-09-16 | 上海良工阀门厂有限公司 | Eccentric accurate adjustment deep blind hole precision boring cutter holder device |
| CN106541160A (en) * | 2016-12-07 | 2017-03-29 | 北京北方车辆集团有限公司 | A kind of rotatable radial expansion cutter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111321406A (en) * | 2018-12-15 | 2020-06-23 | 兰州交通大学 | Electric spark deposition mechanism for functional coating on inner wall of long and thin pipeline |
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Application publication date: 20181120 |
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