CN110369742A - A kind of cutter facilitating adjusting - Google Patents
A kind of cutter facilitating adjusting Download PDFInfo
- Publication number
- CN110369742A CN110369742A CN201910541579.5A CN201910541579A CN110369742A CN 110369742 A CN110369742 A CN 110369742A CN 201910541579 A CN201910541579 A CN 201910541579A CN 110369742 A CN110369742 A CN 110369742A
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- CN
- China
- Prior art keywords
- blade
- cutter
- screw
- thread portion
- hole
- 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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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
- B23B27/16—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped
- B23B27/1685—Adjustable position of the cutting inserts
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Cutting Devices (AREA)
Abstract
The invention discloses a kind of cutters for facilitating adjusting, including cutterhead, blade and pressing plate, cutterhead at least offers one group of cutter groove along circumferential direction, cutter further includes adjusting screw, cutter groove includes bottom positioning surface and the side-locating face that intersects with bottom positioning surface, face contact between blade bottom surface and bottom positioning surface, blade side is matched with side-locating face, the location hole and internal thread hole matched with adjusting screw both ends is offered on bottom positioning surface and side-locating face respectively, blade bottom surface offers and adjusts the screw helicitic texture that wherein one end matches, when adjusting cutter, drive turning adjusting screw to adjust position of the blade in cutter groove.The present invention has the advantages that structure is simple, few using attachment and can adjust according to measurement result real time bidirectional.
Description
Technical field
The present invention relates to disk set class cutting tool more particularly to a kind of cutters for facilitating adjusting.
Background technique
In to the higher processing of surface smoothness requirements, position height of the blade on cutter axis direction needs accurate
Positioning, often by the height to blade realization is adjusted in this positioning.
The adjustable cutterhead in existing part only has unidirectional regulatory function, it may be assumed that it is operated by more regulating mechanisms,
It is mobile to a direction can only to make blade, once then needing first to loosen regulating mechanism, so since fault causes blade adjustment excessive
Blade opposite direction is returned manually afterwards, is then adjusted again.This regulating mechanism causes the low of efficiency.
CN102112260A discloses such a adjusting cutter, and this cutter can carry out bidirectional modulation, it can logical
The liter or drop that blade height is realized to the operation of regulating mechanism are crossed, to improve adjusting efficiency.This structure blade is fixed
On cutter holder, the height adjustment to blade is realized by the adjusting to cutter holder.Therefore the accessory needed is relatively more, because
This structure is complex, while a large amount of attachmentes occupy segment space, to reduce the quantity of installable blade on cutterhead.
CN105458313A discloses such a adjusting cutter, and this cutter realizes the two-way of blade by regulating mechanism
It adjusts, to improve adjusting efficiency.But this cutter equally has more attachment, therefore also has segmental defect above-mentioned.
Meanwhile this cutter needs operator to start with from cutterhead side when adjusting to be adjusted.And it is high to raise section in optics toolsetting instrument
When spending, side often narrow space is not easy to operator and starts with, and side allows with single hand (or left or right hand), right
In habit with extremely inconvenient for the operator of opposite direction hand.Rotating cutter-head is generally required, by adjusting is felt a bit, then again
Under rotating cutter-head measurement relatively, then it is rotated further by cutterhead and adjusts, in cycles, greatly reduce efficiency.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art, provide a kind of cutter for facilitating adjusting, should
Cutter structure is simple, few using attachment and can adjust blade according to measurement result real time bidirectional.
In order to solve the above technical problems, the invention adopts the following technical scheme:
A kind of cutter facilitating adjusting, including cutterhead, blade and pressing plate, the cutterhead at least offer one group of knife along circumferential direction
Slot, the blade include blade bottom surface, blade front and for connecting blade bottom surface and the positive blade side of blade, it is described
Pressing plate is fixed on cutterhead to be in contact with blade front, and for by blade pressing, in cutter groove, the cutter to further include adjusting
Screw, the cutter groove include bottom positioning surface and the side-locating face that intersects with bottom positioning surface, the blade bottom surface and bottom positioning surface it
Between face contact, the blade side matches with side-locating face, offers and adjust respectively on the bottom positioning surface and side-locating face
The location hole and internal thread hole that section screw both ends match, the blade bottom surface offer and adjust screw wherein one end matching
The helicitic texture of conjunction drives turning adjusting screw to adjust position of the blade in cutter groove when adjusting cutter.
The location hole and internal thread hole are arranged along the axial direction of cutterhead.
The both ends for adjusting screw are respectively equipped with preceding thread portion and rear thread portion, the rear thread portion and internal thread hole phase
Cooperation, the preceding thread portion are matched with blade bottom surface and location hole, the screw thread rotation side in the preceding thread portion and rear thread portion
To identical.
The thread pitch in the preceding thread portion is P1, and the thread pitch in the rear thread portion is P2, wherein P2 ≠ P1.
The preceding thread portion is rectangular thread or trapezoidal thread, and the location hole is cylindrical hole.
The screw that adjusts offers the driving hole that screw is adjusted convenient for driving, the driving hole edge in preceding thread portion side
Adjust the length direction setting of screw.
The cutter further includes lock-screw, and the pressing plate is fixed on cutter by lock-screw.
The cutter groove includes the positive positioning surface matched with blade front, and the pressing plate offers the first threaded mounting hole,
Offer the second threaded mounting hole on the positive positioning surface, the both ends of the lock-screw respectively with the first threaded mounting hole and
Two threaded mounting holes are threadedly coupled.
The pressing plate is wedge clamp, and the wedge clamp is equipped with inclined-plane, the inclined-plane be in contact with blade front and incite somebody to action
Blade front is pressed in cutter groove.
Compared with the prior art, the advantages of the present invention are as follows:
It is complicated relative to existing regulating mechanism and occupy the cutter of big quantity space 1. the configuration of the present invention is simple, few using attachment
For, cutter of the invention can install more blades, and the present invention can be double to the position progress of blade by adjusting screw
To adjusting, blade can be real-time and easily adjusted according to measurement result, turning adjusting screw adjusts blade and cutter groove side-locating face
Distance, operation error or other reasons cause blade adjustment position be more than need position after, can pass through opposite direction turn
The dynamic screw that adjusts makes blade be moved to the position of needs, only one direction is allowed to adjust relative to existing some regulating mechanisms, when
For blade more than behind target position, needing to move back in situ by blade manually and then readjust, the present invention improves adjusting efficiency.
2. location hole and internal thread hole of the invention are arranged along the axial direction of cutterhead, when adjusting blade, need to cooperate existing
In the optics toolsetting instrument generally used, operator starts with adjusting from the front of the open cutterhead in space, i.e., along the axial direction of cutterhead
Direction is adjusted, and when adjusting, the blade rotation adjusted will first be needed to be allowed to be formed in camera lens clearly as then locking preventing cutter tool
Rotation stop is dynamic, to keep clearly as the result rotation gone out according to toolsetting instrument real-time measurement adjusts screw, so that blade be made to move
The position for moving needs is adjusted relative to existing start with from cutterhead side, and the present invention easily facilitates operator's adjusting.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention.
Fig. 2 is the partial enlarged view in Fig. 1 at C.
Fig. 3 is the structural schematic diagram of blade.
Fig. 4 is the top view of blade.
Fig. 5 is line D-D cross-sectional view in Fig. 4.
Fig. 6 is the structural schematic diagram for adjusting screw.
Fig. 7 is E-E line cross-sectional view in Fig. 6.
Fig. 8 is main view of the invention.
Fig. 9 is N-N line cross-sectional view in Fig. 8.
Figure 10 is P-P line cross-sectional view in Fig. 9.
Each label indicates in figure:
1, cutterhead；2, cutter groove；21, bottom positioning surface；211, location hole；22, positive positioning surface；221, the second threaded mounting hole；23, side
Positioning surface；231, internal thread hole；4, blade；41, blade bottom surface；411, helicitic texture；42, blade side；43, blade front；
3, pressing plate；31, the first threaded mounting hole；5, lock-screw；6, screw is adjusted；61, preceding thread portion；62, rear thread portion；63, it pulls
Hand hole.
Specific embodiment
The present invention is described in further details below with reference to Figure of description and specific embodiment.
As shown in Fig. 1 to 10, a kind of cutter facilitating adjusting of the invention, including cutterhead 1, blade 4 and pressing plate 3, cutterhead 1
One group of cutter groove 2 is at least offered along circumferential direction, and blade 4 is including blade bottom surface 41, blade front 43 and for connecting blade
The blade side 42 of bottom surface 41 and blade front 43, pressing plate 3 is fixed on cutterhead 1 to be in contact with blade front 43, and being used for will
Blade 4 is pressed in cutter groove 2, and cutter further includes adjusting screw 6, and cutter groove 2 includes bottom positioning surface 21 and intersects with bottom positioning surface 21
Side-locating face 23, face contact between blade bottom surface 41 and bottom positioning surface 21, blade side 42 matches with side-locating face 23, bottom
The location hole 211 and internal thread hole matched with adjusting 6 both ends of screw is offered on positioning surface 21 and side-locating face 23 respectively
231, blade bottom surface 41 offers and adjusts the helicitic texture 411 that wherein one end matches of screw 6, when adjusting cutter, drives
Turning adjusting screw 6 is moved to adjust position of the blade 4 in cutter groove 2.
The configuration of the present invention is simple, it is few using attachment, it is complicated relative to existing regulating mechanism and occupy the knife of big quantity space
For tool, cutter of the invention can install more blades 4, the present invention can by adjust screw 6 to the position of blade 4 into
Row bidirectional modulation, can real-time and easily adjust blade 4 according to measurement result, and turning adjusting screw 6 adjusts blade 4 and cutter groove 2
The distance of side-locating face 23, after operation error or other reasons cause 4 adjusting position of blade to be more than to need position, Ke Yitong
It crosses opposite direction rotation and adjusts the position that screw 6 makes blade 4 be moved to needs, only allow list relative to existing some regulating mechanisms
Direction is adjusted, and after blade 4 is more than target position, is needed to move back in situ by blade 4 manually and then be readjusted, the present invention mentions
High adjusting efficiency.
Location hole 211 and internal thread hole 231 are arranged along the axial direction of cutterhead 1.Cutterhead 1 is symmetrical about axis A, axis A
Direction be cutterhead 1 axial direction.When adjusting blade 4, the optics toolsetting instrument generally used now, operator need to be cooperated
The front of the cutterhead 1 open from space is started with adjusting, i.e., adjusts along the axial direction of cutterhead 1, when adjusting, first will need to adjust
The rotation of blade 4 be allowed to be formed in camera lens clearly as, it is dynamic then to lock preventing cutter tool rotation stop, thus keep clearly as, according to
The result rotation that toolsetting instrument real-time measurement goes out adjusts screw 6, to make blade 4 be moved to the positions of needs, relative to existing
Start with from 1 side of cutterhead and be adjusted, the present invention easily facilitates operator's adjusting.
In the present embodiment, helicitic texture 411 is similar to a part of screw thread, is made of the identical slot of spacing, flight pitch
It is identical as the flight pitch of 6 one end of screw is adjusted.
When adjusting screw 6 is located in location hole 211, the bottom positioning surface 21 for adjusting screw 6 relative to cutter groove 2 has height
Poor h1, h1 > 0, in this way adjusting screw 6 have protrusion part, the screw thread knot of protrusion part and blade 4 relative to bottom positioning surface 21
Structure 411 matches or is in contact.
As shown in fig. 6, the both ends for adjusting screw 6 are respectively equipped with preceding thread portion 61 and rear thread portion 62, rear thread portion 62 with
Internal thread hole 231 matches, and preceding thread portion 61 is matched with blade bottom surface 41 and location hole 211, preceding thread portion 61 and rear thread
The rotation direction of thread in portion 62 is identical.
The thread pitch in preceding thread portion 61 is P1, and the thread pitch in rear thread portion 62 is P2, wherein P2 ≠ P1.
As shown in fig. 7, preceding thread portion 61 is rectangular thread or trapezoidal thread, location hole 211 is cylindrical hole.It is used in cutter
In the process, blade 4 will receive very big cutting force, therefore the bottom positioning surface 21 of cutter groove 2 needs to provide enough branch for blade 4
Support, to avoid preceding thread portion 61 from jacking up blade 4, preceding thread portion 61 is combined into gap with matching for the helicitic texture 411 of blade bottom surface 41
Cooperation.Meanwhile to avoid 61 screw thread of preceding thread portion and the gap of 41 helicitic texture 411 of blade bottom surface excessive, causes to work poor, adjust
61 screw thread of preceding thread portion for saving screw 6 is accurately positioned in the location hole 211 of cutterhead 1 again.In order to improve preceding thread portion
61 with cutterhead 1 on location hole 211 cooperation precision, adjust screw 6 61 thread crest of preceding thread portion be a part of column justify,
That is: 61 thread crest of preceding thread portion be the cylinder with one fixed width H, it is preferred that 61 screw thread of preceding thread portion be rectangular thread or
Person's trapezoidal thread, using such structure, the outer circle of 61 screw thread of preceding thread portion is cylinder, can be good at determining on cutterhead 1
Position hole 211 matches, and guarantees reasonable gap between 61 screw thread of preceding thread portion and blade 4.
The rear thread portion 62 for adjusting screw 6 is threadedly coupled with the internal thread hole 231 of cutterhead 1.When adjusting the rotation of screw 6,
The threaded connection in rear thread portion 62 causes to adjust screw 6 and cutterhead 1 forms relative motion, specially along adjusting screw axis B
Direction be moved forward and backward, moving distance be 62 screw thread of rear thread portion screw pitch multiply adjust screw 6 rotate circle number.Simultaneously because preceding
Threaded portion 61 is matched with the helicitic texture 411 of blade bottom surface 41, and the rotation for adjusting screw 6 equally will cause blade 4 and adjust
Relative movement between screw 6, moving direction are the screw pitch in preceding thread portion 61 along 6 direction axis B of screw, moving distance is adjusted
Multiply the turnning circle for adjusting screw 6.Due to adjusting the preceding thread portion 61 of screw 6 and the rotation direction of thread phase in rear thread portion 62
Together, therefore when adjusting the rotation of screw 6, relative to adjusting for screw 6, blade 4 and 1 moving direction of cutterhead are identical, it may be assumed that
Blade 4 and cutterhead 1 are moved along axis B to same direction.
Since the preceding thread portion 61 for adjusting screw 6 is different with the thread pitch in rear thread portion 62, spiral shell is adjusted in rotation
When following closely 6, blade 4 and cutterhead 1 relative to the moving distance for adjusting screw 6 be it is different, form blade 4 relative to cutterhead 1
Movement, to complete the regulatory function of blade 4.Blade 4 relative to cutterhead 1 moving distance depend on adjust screw 6 before spiral shell
The pitch difference in line portion 61 and rear thread portion 62 multiplies the rotating cycle for adjusting screw 6.
In more demanding processing occasion, the adjusting of 4 height of blade is often relatively finer, specifically: adjustable range is little,
But degree of regulation is more demanding, generally requires the adjusting of micron level, it may be assumed that the opposite adjusting with cutterhead 1 of blade 4 is needed in micron
It is moved on the order of magnitude, and the manufacture of the screw thread of micron level screw pitch is difficult big, and since screw pitch is small, often intolerant to abrasion, longevity
It orders very short.And blade 4 of the present invention depends on adjusting preceding thread portion 61 and the rear thread of screw 6 relative to the moving distance of cutterhead 1
The pitch difference in portion 62, therefore preceding thread portion 61 and 62 screw thread of rear thread portion can all be easily fabricated steep-pitch thread, as long as
The two pitch difference is small, so that it may satisfy the use demand.
On the other hand, the helicitic texture 411 of blade bottom surface 41 needs to match with the preceding thread portion 61 for adjusting screw 6, because
This, the two screw pitch having the same, preceding thread portion 61 uses steep-pitch thread, can be convenient the production of blade 4, because due to knife
The limitation of 4 manufacture craft of piece, fine pitch are often difficult to produce.
It adjusts screw 6 and offers the driving hole 63 for adjusting screw 6 convenient for driving, 63 edge of driving hole in 61 side of preceding thread portion
Adjust the length direction setting of screw 6.When operation adjusts screw 6, spanner needs to inject in the driving hole 63 for adjusting screw 6,
Therefore operation direction that is, on the direction of 1 axis A of cutterhead, is operated in the front of cutterhead 1 from one end with blade 4, and
It is not from the side of cutterhead 1, i.e., perpendicular to being operated on the direction of 1 axis A of cutterhead, the operation is more convenient.
Cutter further includes lock-screw 5, and pressing plate 3 is fixed on cutter by lock-screw 5.
Cutter groove 2 includes the positive positioning surface 22 matched with blade front 43, and pressing plate 3 offers the first threaded mounting hole 31,
Offer the second threaded mounting hole 221 on positive positioning surface 22, the both ends of lock-screw 5 respectively with the first threaded mounting hole 31 and the
Two threaded mounting holes 221 are threadedly coupled.
Pressing plate 3 is wedge clamp, and wedge clamp is equipped with inclined-plane, and inclined-plane is in contact with blade front 43 and by blade front 43
It is pressed in cutter groove 2.By rotating lock-screw 5, pressing plate 3 is tensed to 23 direction of side-locating face of cutter groove 2, utilizes pressing plate 3
Wedge structure compress blade 4, to complete the fixation of blade 4.
Although the present invention has been disclosed as a preferred embodiment, however, it is not intended to limit the invention.It is any to be familiar with ability
The technical staff in domain, without deviating from the scope of the technical scheme of the present invention, all using the technology contents pair of the disclosure above
Technical solution of the present invention makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, all
Without departing from the content of technical solution of the present invention, according to the present invention technical spirit any simple modification made to the above embodiment,
Equivalent variations and modification, all shall fall within the protection scope of the technical scheme of the invention.
Claims (9)
1. a kind of cutter for facilitating adjusting, including cutterhead (1), blade (4) and pressing plate (3), the cutterhead (1) is along circumferential direction extremely
Offer one group of cutter groove (2) less, the blade (4) includes blade bottom surface (41), blade positive (43) and for connecting blade
The blade side (42) of bottom surface (41) and blade positive (43), the pressing plate (3) are fixed on cutterhead (1) positive (43) with blade
It is in contact, and for blade (4) to be pressed in cutter groove (2), it is characterised in that: the cutter further includes adjusting screw (6), institute
Stating cutter groove (2) includes bottom positioning surface (21) and the side-locating face (23) intersected with bottom positioning surface (21), the blade bottom surface (41)
The face contact between bottom positioning surface (21), the blade side (42) match with side-locating face (23), the bottom positioning surface
(21) and on side-locating face (23) location hole (211) and internal thread hole matched with adjusting screw (6) both ends is offered respectively
(231), the blade bottom surface (41) offers and adjusts screw (6) helicitic texture (411) that wherein one end matches, and works as tune
When saving cutter, drive turning adjusting screw (6) to adjust position of the blade (4) in cutter groove (2).
2. cutter according to claim 1, it is characterised in that: the location hole (211) and internal thread hole (231) are along cutterhead
(1) axial direction setting.
3. cutter according to claim 2, it is characterised in that: the both ends for adjusting screw (6) are respectively equipped with preceding thread
Portion (61) and rear thread portion (62), the rear thread portion (62) match with internal thread hole (231), the preceding thread portion (61) with
Blade bottom surface (41) and location hole (211) match, the rotation direction of thread of the preceding thread portion (61) and rear thread portion (62)
It is identical.
4. cutter according to claim 3, it is characterised in that: the thread pitch of the preceding thread portion (61) is P1, described
The thread pitch in rear thread portion (62) is P2, wherein P2 ≠ P1.
5. cutter according to claim 3 or 4, it is characterised in that: the preceding thread portion (61) is rectangular thread or trapezoidal
Screw thread, the location hole (211) are cylindrical hole.
6. cutter according to claim 3 or 4, it is characterised in that: the adjusting screw (6) is in preceding thread portion (61) side
The driving hole (63) that screw (6) are adjusted convenient for driving is offered, the driving hole (63) sets along the length direction for adjusting screw (6)
It sets.
7. cutter according to any one of claim 1 to 4, it is characterised in that: the cutter further includes lock-screw
(5), the pressing plate (3) is fixed on cutter by lock-screw (5).
8. cutter according to claim 7, it is characterised in that: the cutter groove (2) includes matching with blade positive (43)
Positive positioning surface (22), the pressing plate (3) offers the first threaded mounting hole (31), and is offered on the positive positioning surface (22)
Two threaded mounting holes (221), the both ends of the lock-screw (5) are installed with the first threaded mounting hole (31) and the second screw thread respectively
Hole (221) is threadedly coupled.
9. cutter according to claim 7, it is characterised in that: the pressing plate (3) is wedge clamp, and the wedge clamp is set
There is inclined-plane, the inclined-plane is in contact with blade positive (43) and blade positive (43) is pressed in cutter groove (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910541579.5A CN110369742A (en) | 2019-06-21 | 2019-06-21 | A kind of cutter facilitating adjusting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910541579.5A CN110369742A (en) | 2019-06-21 | 2019-06-21 | A kind of cutter facilitating adjusting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110369742A true CN110369742A (en) | 2019-10-25 |
Family
ID=68250578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910541579.5A Pending CN110369742A (en) | 2019-06-21 | 2019-06-21 | A kind of cutter facilitating adjusting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110369742A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1194601A1 (en) * | 1984-06-06 | 1985-11-30 | Предприятие П/Я В-8772 | Side milling cutter |
| FR2615769B1 (en) * | 1987-06-01 | 1994-04-22 | Safety | |
| US6254319B1 (en) * | 1997-03-03 | 2001-07-03 | Andreas Maier | Friction and vertical cutting tool |
| CN102112260A (en) * | 2008-08-04 | 2011-06-29 | 伊斯卡有限公司 | Cutting tool having bidirectional adjustment mechanism |
| CN105458313A (en) * | 2014-09-30 | 2016-04-06 | 山特维克知识产权股份有限公司 | Mechanism for enhanced, bi-directional fine adjustment of cutting insert cartridges in machine tools |
| CN205834332U (en) * | 2016-08-05 | 2016-12-28 | 哈尔滨第一工具制造有限公司 | A kind of broad-adjustable indexable milling cutter |
-
2019
- 2019-06-21 CN CN201910541579.5A patent/CN110369742A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1194601A1 (en) * | 1984-06-06 | 1985-11-30 | Предприятие П/Я В-8772 | Side milling cutter |
| FR2615769B1 (en) * | 1987-06-01 | 1994-04-22 | Safety | |
| US6254319B1 (en) * | 1997-03-03 | 2001-07-03 | Andreas Maier | Friction and vertical cutting tool |
| CN102112260A (en) * | 2008-08-04 | 2011-06-29 | 伊斯卡有限公司 | Cutting tool having bidirectional adjustment mechanism |
| CN105458313A (en) * | 2014-09-30 | 2016-04-06 | 山特维克知识产权股份有限公司 | Mechanism for enhanced, bi-directional fine adjustment of cutting insert cartridges in machine tools |
| CN205834332U (en) * | 2016-08-05 | 2016-12-28 | 哈尔滨第一工具制造有限公司 | A kind of broad-adjustable indexable milling cutter |
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Application publication date: 20191025 |