CN104907612A - Drill bit of replaceable cutter head type structure - Google Patents
Drill bit of replaceable cutter head type structure Download PDFInfo
- Publication number
- CN104907612A CN104907612A CN201510252190.0A CN201510252190A CN104907612A CN 104907612 A CN104907612 A CN 104907612A CN 201510252190 A CN201510252190 A CN 201510252190A CN 104907612 A CN104907612 A CN 104907612A
- Authority
- CN
- China
- Prior art keywords
- cutter head
- cutter
- bit
- drill bit
- type structure
- 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.)
- Granted
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/02—Twist drills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/06—Drills with lubricating or cooling equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2205/00—Fixation of cutting inserts in holders
- B23B2205/04—Fixation screws, bolts or pins of particular form
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2205/00—Fixation of cutting inserts in holders
- B23B2205/12—Seats for cutting inserts
Abstract
The invention discloses a drill bit of a replaceable cutter head type structure. Currently, a drill bit of a replaceable cutter head type structure high in machining accuracy, high in mounting accuracy and stable in rotating does not exist. The drill bit comprises a cutter rod, a cutter head and a fixing screw. The cutter rod comprises a cutter rod body. The drill bit is characterized in that a cutter head locating groove is formed in the front end of the cutter rod body, two supporting planes are arranged on the cutter head locating groove, after one supporting plane rotate around the axis of the cutter rod by 180 degrees, the supporting plane and the other supporting plane are overlapped, a locking groove is formed in a fixing column, the fixing column is arranged in a cutter head locating hole in a sleeved mode, a cutter head body is placed in the cutter head locating groove, the two supporting faces on the cutter head are tightly attached to the two supporting planes on the cutter rod respectively, the locating bottom face on the cutter head is tightly attached to the bottom of the cutter head locating groove, the fixing screw is in thread connection into a cutter head fixing hole, and the front end of the fixing screw abuts against the locking groove in the cutter head. The drill bit is high in machining accuracy, high in mounting accuracy, stable in rotating and stable in cutting, the cutter head can be abandoned, and service life is long.
Description
Technical field
The present invention relates to a kind of drill bit, especially relate to a kind of drill bit of interchangeable cutter bit type structure, be mainly used in the hole machined of mechanical processing industry, belong to a kind of five metals machining tool.
Background technology
The specification of carbide alloy class fluted drill conventional in existing market is all less, the fluted drill of the carbide alloy class of large gauge is in constantly researching and developing, because existing carbide alloy class fluted drill adopts monolithic construction usually, namely be non-removable between knife bar and cutter head, adopt between knife bar and cutter head and be welded and fixed, cause the production cost of carbide alloy class fluted drill high, resource utilization is low, it is particularly evident that this embodies in large gauge carbide alloy class fluted drill, in addition, also make the processing of carbide alloy class fluted drill not easily, processed complex, service life is short.
The drill bit also having some cutter heads interchangeable now, if publication date is on 01 04th, 2012, publication number is in the Chinese patent of CN102303152A, disclose a kind of spiral bit of changeable blade, it comprises a twist drill rods, on drilling rod two debris front of the slot notch between laterally have a blade installation slot, the Lower Half of blade installation slot is one and amplifies at the bottom of the V-shaped groove of angle, two side at the bottom of V-shaped groove is provided with a locking hole, the side of locking hole is countersunk screw holes, opposite side is unthreaded hole, a blade is completely combined with in blade installation slot, it blade upper surface is rotary-cut blade, blade bottom be one with the positioning body matched at the bottom of V-shaped groove, positioning body is provided with through hole with locking hole relevant position, a countersunk head screw be deep in insert through hole and opposite side unthreaded hole is installed in locking hole.And for example publication date is on 08 23rd, 2006, publication number is in the Chinese patent of CN2808378, disclose a kind of replaceable carbide drill, it comprises the fixed part of drilling rod body, blade and fastening blade, the dislocation of blade both sides in echelon, insert bottom center is with an alignment pin, and drilling rod body is provided with locating hole; Alignment pin and blade are integrated, and match with locating hole, for the location of blade on drilling rod body; Blade both sides have a fixing hole separately, fixed part and this two fixing holes of fastening blade are connected, by carrying a circular alignment pin in insert bottom center, blade both sides have a screw with being centrosymmetric separately, drill bit are assembled easier.The machining accuracy of the drill bit that these cutter heads existing are interchangeable is not high, and installation accuracy is not high, rotates steady not, cuts steady not.
In sum, also do not have one to meet reasonable in design at present, machining accuracy is high, and installation accuracy is high, stability of rotation, stable cutting, and cutter head can be given up simultaneously, the drill bit of the interchangeable cutter bit type structure of long service life.
Summary of the invention
The object of the invention is to overcome above shortcomings in prior art, and provide a kind of reasonable in design, machining accuracy is high, and installation accuracy is high, stability of rotation, stable cutting, and cutter head can be given up, the drill bit of the interchangeable cutter bit type structure of long service life.
The present invention's adopted technical scheme that solves the problem is: the drill bit of this interchangeable cutter bit type structure comprises knife bar, cutter head and hold-down screw, described knife bar comprises cutter bar body, described cutter bar body is provided with chip area, described cutter head comprises bit body and fixed leg, one end of described fixed leg is fixed on one end of bit body, the other end of described bit body is provided with apex point, with main cutting edge and web thinning on described apex point, its design feature is: the front end of described cutter bar body is provided with cutter head locating slot, this cutter head locating slot is connected with chip area, the bottom of described cutter head locating slot is provided with cutter head locating hole, the outer wall of described cutter bar body is provided with cutter head fixing hole, described cutter head fixing hole is screw hole structure, this cutter head fixing hole and cutter head locating hole intersect vertically, described cutter head locating slot is provided with two supporting planes, described two supporting planes all with the bottom vertical of cutter head locating slot, a supporting plane is after knife bar axis rotates 180 degree, overlapping with another supporting plane, described fixed leg is provided with locking slot, one end of described bit body is provided with bottom surface, location, the outer wall of this bit body is provided with two supporting surfaces, bottom surface, described location and two supporting surfaces are planar structure, a supporting surface is after cutter head axis revolves turnback, and another supporting surface is overlapping, described fixed leg is sleeved in cutter head locating hole, described bit body is arranged in cutter head locating slot, two supporting surfaces on described cutter head are close to two supporting planes on knife bar respectively, the bottom of cutter head locating slot is close in bottom surface, location on described cutter head, described hold-down screw is threaded in cutter head fixing hole, and the front end of this hold-down screw withstands on the locking slot of cutter head.
As preferably, locking slot of the present invention is made up of a bottom surface and two walls, and described two walls arrange along the axial direction of fixed leg, and described two walls are all in ramp-like configuration, and the distance between these two walls reduces from groove top gradually to bottom land.Two walls in ramp-like configuration serve guide effect, are convenient to fix.
As preferably, be provided with inner cooling channel in cutter bar body of the present invention, on the back-end central of shank of the import position cutter bar body of described inner cooling channel or the cylindrical of shank, the outlet of this inner cooling channel is arranged in blade end face or chip area by cutter head place.
As preferably, cutter head locating slot of the present invention is two L shape structures, and a L shape structure is after knife bar axis rotates 180 degree, and another L shape Structural superposition, and described supporting surface is L shape structure.
As preferably, cutter head locating hole of the present invention and fixed leg are cylindrical structural.
As preferably, the axis of cutter head locating hole of the present invention and cutter spindle line overlap.
As preferably, chip area of the present invention is straight groove structure or helical groove structure.
As preferably, the angle of apex point of the present invention is 135 degree, and described web thinning is X-type structure, and described main cutting edge adopts wave edge structure.Increase cutting sharpness and the edge strength of cutter thus.
As preferably, the outer wall of bit body of the present invention is provided with cylindrical land and negative cutting edge.Increase the intensity of cutting edge thus.
As preferably, bottom surface, location of the present invention is vertical with supporting surface.
The present invention compared with prior art, has the following advantages and effect: structure is simple, reasonable in design, stability of rotation, stable cutting, and cutter head can be given up, and just can realize the recycling of knife bar, long service life by changing cutter head.Two supporting surfaces on cutter head are close to two supporting planes on knife bar respectively, the bottom of cutter head locating slot is close in bottom surface, location on cutter head, the front end of hold-down screw withstands on the locking slot of cutter head, make the machining accuracy of cutter head and knife bar high, the installation accuracy of cutter head is high, guarantees the stationarity that cutter head rotates and cuts.
The structure of knife bar of the present invention is simple, reasonable in design, interchangeable bit, long service life, cutter head locating slot is provided with two supporting planes, for supporting cutter head, make the more steady of the rotation of cutter head, and be conducive to improving machining accuracy and improving installation accuracy, improve the overall performance of drill bit.The front end of cutter bar body is provided with cutter head locating slot, and cutter head locating slot is connected with chip area, and the bottom of cutter head locating slot is provided with cutter head locating hole, the outer wall of cutter bar body is provided with cutter head fixing hole, make cutter head clamping more firm on knife bar, drilling is more steady, and chip removal is more smooth and easy.
The structure of cutter head of the present invention is simple, reasonable in design, and design is unique, interchangeable bit, long service life, is provided with two supporting surfaces at the outer wall of bit body, and bottom surface, location and two supporting surfaces are planar structure, a supporting surface is after cutter head axis revolves turnback, overlapping with another supporting surface, can well transmitting torque, make the more steady of the rotation of cutter head, and be conducive to improving machining accuracy and improving installation accuracy, improve the overall performance of drill bit.
Accompanying drawing explanation
Fig. 1 is the main TV structure schematic diagram of the drill bit of interchangeable cutter bit type structure in the embodiment of the present invention.
Fig. 2 is the left TV structure schematic diagram of Fig. 1.
Fig. 3 is the plan structure schematic diagram of Fig. 1.
Fig. 4 be Fig. 1 look up structural representation.
Fig. 5 is the perspective view of the drill bit of interchangeable cutter bit type structure in the embodiment of the present invention.
Fig. 6 is the main TV structure schematic diagram of knife bar in the embodiment of the present invention.
Fig. 7 is the plan structure schematic diagram of Fig. 6.
Fig. 8 is the left TV structure schematic diagram of Fig. 6.
Fig. 9 is the perspective view of knife bar in the embodiment of the present invention.
Figure 10 is the main TV structure schematic diagram in the embodiment of the present invention after cutter head amplification.
Figure 11 is the left TV structure schematic diagram of Figure 10.
Figure 12 is the right TV structure schematic diagram of Figure 10.
Figure 13 is the plan structure schematic diagram of Figure 10.
Figure 14 is the perspective view in the embodiment of the present invention after cutter head amplification.
Detailed description of the invention
Below in conjunction with accompanying drawing, also by embodiment, the present invention is described in further detail, and following examples are explanation of the invention and the present invention is not limited to following examples.
Embodiment.
See Fig. 1 to Figure 14, in the present embodiment, the drill bit of interchangeable cutter bit type structure comprises knife bar 1, cutter head 2 and hold-down screw 3, wherein knife bar 1 comprises cutter bar body 11, cutter bar body 11 is provided with chip area 12, the quantity of chip area 12 is two, and this chip area 12 can be straight groove structure or helical groove structure.
In the present embodiment, the front end of cutter bar body 11 is provided with cutter head locating slot 13, and respectively with two, the both sides chip area 12 of this cutter head locating slot 13 is connected, and makes chip removal more smooth and easy.In the present embodiment, the bottom of cutter head locating slot 13 is provided with cutter head locating hole 15, and cutter head locating hole 15 is cylindrical structural, the axis of cutter head locating hole 15 and knife bar axis x overlap.In the present embodiment, the outer wall of cutter bar body 11 is provided with cutter head fixing hole 14, and cutter head fixing hole 14 is screw hole structure, and cutter head fixing hole 14 and cutter head locating hole 15 intersect vertically.
Cutter head locating slot 13 in the present embodiment is provided with two supporting planes 17, two supporting planes 17 all with the plane perpendicular of cutter head locating slot 13, a supporting plane 17 is after knife bar axis x revolves turnback, overlapping with another supporting plane 17, two supporting planes 17 are for supporting cutter head 2, make the more steady of the rotation of cutter head 2, drilling is more steady, and is conducive to improving machining accuracy and improving installation accuracy.
Inner cooling channel 16 is provided with in cutter bar body 11 in the present embodiment, namely have employed the interior type of cooling, on the back-end central of shank of the import position cutter bar body 11 of inner cooling channel 16 or the cylindrical of shank, the outlet of this inner cooling channel 16 is arranged in blade end face or chip area 12 by cutter head place.In the present embodiment, cutter bar body 11 also can not adopt the interior type of cooling.
Cutter head locating slot 13 in the present embodiment is two L shape structures, and a L shape structure is after knife bar axis x revolves turnback, and another L shape Structural superposition.
Cutter head 2 in the present embodiment comprises bit body 29 and fixed leg 21, and wherein, fixed leg 21 is cylindrical structural, and fixed leg 21 is for centralized positioning, and one end of fixed leg 21 is fixed on one end of bit body 29.In the present embodiment, the other end of bit body 29 is provided with apex point 26, and the angle of apex point 26 is 135 degree, and with main cutting edge and web thinning 25 on apex point 26, main cutting edge adopts wave edge structure usually, and web thinning 25 is generally X-type structure.
Fixed leg 21 in the present embodiment is provided with locking slot 22, locking slot 22 is made up of a bottom surface and two walls, two walls arrange along the axial direction of fixed leg 21, and two walls are all in ramp-like configuration, and the distance between these two walls reduces from groove top gradually to bottom land.Locking slot 22 is commonly called as flat, and this is common practise to those skilled in the art.
In the present embodiment, one end of bit body 29 is provided with bottom surface 23, location, the outer wall of this bit body 29 is provided with two supporting surfaces 24, bottom surface 23, location and two supporting surfaces 24 are planar structure, a supporting surface 24 is after cutter head axis y revolves turnback, overlapping with another supporting surface 24, can well transmitting torque, bottom surface 23, location is vertical with supporting surface 24.
Supporting surface 24 in the present embodiment is L shape structure.Cylindrical land 27 and negative cutting edge 28 can be provided with at the outer wall of bit body 29, to increase cutting sharpness and the edge strength of cutter, and increase the intensity of cutting edge.
Fixed leg 21 in the present embodiment is sleeved in cutter head locating hole 15, and bit body 29 is arranged in cutter head locating slot 13, and two supporting surfaces 24 on cutter head 2 are close to two supporting planes 17 on knife bar 1 respectively, makes transmission more steady, cuts more steady; The bottom of cutter head locating slot 13 is close in bottom surface, location 23 on cutter head 2, and this also makes transmission more steady, cuts more steady.Hold-down screw 3 is threaded in cutter head fixing hole 14, and the front end of this hold-down screw 3 withstands on the locking slot 22 of cutter head 2, and two skewed walls play guide effect, finally make the front end of hold-down screw 3 withstand on the bottom surface of locking slot 22.
Knife bar 1 in the present embodiment can facilitate, firmly clamping cutter head, is head replaceable drill bit, cutting-tool's used life is extended by all-in-one-piece drilling-bit improvement, and cost reduces.The present embodiment can strengthen the cross section of chip area 12, to form chip area 12 cross section of super large.Clamping screw hole in the present embodiment and insert groove can be applicable to the cutter of multiple specification, widely applicable.The present embodiment can pass through clip type fixturing blade, can adopt self-control blade, improves drill bit service efficiency and service life, raising machining accuracy.
Cutter head 2 in the present embodiment can facilitate, firmly carry out clamping, is head replaceable drill bit by all-in-one-piece drilling-bit improvement, and cutting-tool's used life is extended, and cost reduces.Cutter head fixed bit in the present invention can have bottom surface, cylinder step cylindrical, L shape supporting surface and screw flat, and cutter head cuts position can wave edge, drill point angle, X-type web thinning and cylindrical dorsal horn, and tool sharpening can be made wider general.The present invention can pass through clip type clamping cutter head, can adopt self-control cutter head, to improve drill bit service efficiency and service life, raising machining accuracy.
In addition, it should be noted that, the specific embodiment described in this description, the shape, institute's title of being named etc. of its parts and components can be different, and the above content described in this description is only to structure example of the present invention explanation.The equivalence change that structure, feature and the principle of all foundations described in inventional idea of the present invention are done or simple change, be included in the protection domain of patent of the present invention.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment; only otherwise depart from structure of the present invention or surmount this scope as defined in the claims, protection scope of the present invention all should be belonged to.
Claims (10)
1. the drill bit of an interchangeable cutter bit type structure, comprise knife bar, cutter head and hold-down screw, described knife bar comprises cutter bar body, described cutter bar body is provided with chip area, described cutter head comprises bit body and fixed leg, one end of described fixed leg is fixed on one end of bit body, the other end of described bit body is provided with apex point, with main cutting edge and web thinning on described apex point, it is characterized in that: the front end of described cutter bar body is provided with cutter head locating slot, this cutter head locating slot is connected with chip area, the bottom of described cutter head locating slot is provided with cutter head locating hole, the outer wall of described cutter bar body is provided with cutter head fixing hole, described cutter head fixing hole is screw hole structure, this cutter head fixing hole and cutter head locating hole intersect vertically, described cutter head locating slot is provided with two supporting planes, described two supporting planes all with the bottom vertical of cutter head locating slot, a supporting plane is after knife bar axis rotates 180 degree, overlapping with another supporting plane, described fixed leg is provided with locking slot, one end of described bit body is provided with bottom surface, location, the outer wall of this bit body is provided with two supporting surfaces, bottom surface, described location and two supporting surfaces are planar structure, a supporting surface is after cutter head axis revolves turnback, and another supporting surface is overlapping, described fixed leg is sleeved in cutter head locating hole, described bit body is arranged in cutter head locating slot, two supporting surfaces on described cutter head are close to two supporting planes on knife bar respectively, the bottom of cutter head locating slot is close in bottom surface, location on described cutter head, described hold-down screw is threaded in cutter head fixing hole, and the front end of this hold-down screw withstands on the locking slot of cutter head.
2. the drill bit of interchangeable cutter bit type structure according to claim 1, it is characterized in that: described locking slot is made up of a bottom surface and two walls, described two walls arrange along the axial direction of fixed leg, described two walls are all in ramp-like configuration, and the distance between these two walls reduces from groove top gradually to bottom land.
3. the drill bit of interchangeable cutter bit type structure according to claim 1, it is characterized in that: in described cutter bar body, be provided with inner cooling channel, on the back-end central of shank of the import position cutter bar body of described inner cooling channel or the cylindrical of shank, the outlet of this inner cooling channel is arranged in blade end face or chip area by cutter head place.
4. the drill bit of the interchangeable cutter bit type structure according to claim 1 or 2 or 3, it is characterized in that: described cutter head locating slot is two L shape structures, a L shape structure is after knife bar axis rotates 180 degree, and another L shape Structural superposition, and described supporting surface is L shape structure.
5. the drill bit of the interchangeable cutter bit type structure according to claim 1 or 2 or 3, is characterized in that: described cutter head locating hole and fixed leg are cylindrical structural.
6. the drill bit of the interchangeable cutter bit type structure according to claim 1 or 2 or 3, is characterized in that: the axis of described cutter head locating hole and cutter spindle line overlap.
7. the drill bit of the interchangeable cutter bit type structure according to claim 1 or 2 or 3, is characterized in that: described chip area is straight groove structure or helical groove structure.
8. the drill bit of the interchangeable cutter bit type structure according to claim 1 or 2 or 3, is characterized in that: the angle of described apex point is 135 degree, and described web thinning is X-type structure, and described main cutting edge adopts wave edge structure.
9. the drill bit of the interchangeable cutter bit type structure according to claim 1 or 2 or 3, is characterized in that: the outer wall of described bit body is provided with cylindrical land and negative cutting edge.
10. the drill bit of the interchangeable cutter bit type structure according to claim 1 or 2 or 3, is characterized in that: bottom surface, described location is vertical with supporting surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510252190.0A CN104907612B (en) | 2015-05-18 | 2015-05-18 | A kind of drill bit of interchangeable cutter bit type structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510252190.0A CN104907612B (en) | 2015-05-18 | 2015-05-18 | A kind of drill bit of interchangeable cutter bit type structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104907612A true CN104907612A (en) | 2015-09-16 |
| CN104907612B CN104907612B (en) | 2018-03-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510252190.0A Active CN104907612B (en) | 2015-05-18 | 2015-05-18 | A kind of drill bit of interchangeable cutter bit type structure |
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| CN (1) | CN104907612B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108573091A (en) * | 2018-03-13 | 2018-09-25 | 华侨大学 | A kind of cutter wave edge design method |
| CN109226833A (en) * | 2018-09-04 | 2019-01-18 | 东莞艾瑞克精密工具有限公司 | Drill bit |
| CN110461518A (en) * | 2017-09-20 | 2019-11-15 | 株式会社芝技研 | Jig drill head |
| CN110799296A (en) * | 2017-07-10 | 2020-02-14 | 山特维克知识产权股份有限公司 | Rotary cutting insert and tool with declined axial support surface |
| CN112453508A (en) * | 2020-11-25 | 2021-03-09 | 深圳市蓝海永兴实业有限公司 | PCD drilling, milling and chamfering tool for machining composite material hole |
| CN112453507A (en) * | 2020-11-20 | 2021-03-09 | 株洲钻石切削刀具股份有限公司 | Modular drilling machining tool |
| CN112453506A (en) * | 2020-11-20 | 2021-03-09 | 株洲钻石切削刀具股份有限公司 | Drilling machining tool |
| CN112809057A (en) * | 2021-02-02 | 2021-05-18 | 苏州沃钛工业技术有限公司 | Single-hole limiting inclined-penetrating locking head-changing drill |
| CN113828814A (en) * | 2021-10-14 | 2021-12-24 | 河南四方达超硬材料股份有限公司 | Machine presss from both sides formula motor casing macropore processing superhard cutter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110799296A (en) * | 2017-07-10 | 2020-02-14 | 山特维克知识产权股份有限公司 | Rotary cutting insert and tool with declined axial support surface |
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| CN112453507A (en) * | 2020-11-20 | 2021-03-09 | 株洲钻石切削刀具股份有限公司 | Modular drilling machining tool |
| CN112453506A (en) * | 2020-11-20 | 2021-03-09 | 株洲钻石切削刀具股份有限公司 | Drilling machining tool |
| CN112453508A (en) * | 2020-11-25 | 2021-03-09 | 深圳市蓝海永兴实业有限公司 | PCD drilling, milling and chamfering tool for machining composite material hole |
| CN112453508B (en) * | 2020-11-25 | 2021-08-06 | 深圳市蓝海永兴实业有限公司 | PCD drilling, milling and chamfering tool for machining composite material hole |
| CN112809057A (en) * | 2021-02-02 | 2021-05-18 | 苏州沃钛工业技术有限公司 | Single-hole limiting inclined-penetrating locking head-changing drill |
| CN113828814A (en) * | 2021-10-14 | 2021-12-24 | 河南四方达超硬材料股份有限公司 | Machine presss from both sides formula motor casing macropore processing superhard cutter |
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| CN104907612B (en) | 2018-03-09 |
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Denomination of invention: A bit with changeable cutter head structure Effective date of registration: 20201217 Granted publication date: 20180309 Pledgee: Zhejiang Haiyan Rural Commercial Bank Co.,Ltd. Shupu sub branch Pledgor: ZHEJIANG XINXING TOOLS Co.,Ltd. Registration number: Y2020330001229 |
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