CN111774618B - Step drill bit - Google Patents
Step drill bit Download PDFInfo
- Publication number
- CN111774618B CN111774618B CN202010637195.6A CN202010637195A CN111774618B CN 111774618 B CN111774618 B CN 111774618B CN 202010637195 A CN202010637195 A CN 202010637195A CN 111774618 B CN111774618 B CN 111774618B
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- cutting
- cutting portion
- face
- clamping part
- clamping
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
-
- 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
Abstract
The invention discloses a step drill bit, which relates to the field of drill bits and comprises a clamping part, wherein one end of the clamping part is sequentially provided with a first cutting part and a second cutting part, the diameter of the first cutting part is larger than that of the second cutting part, and the clamping part, the first cutting part and the second cutting part are arranged in a split manner; the end face of one end, close to the first cutting portion, of the second cutting portion is provided with a plurality of installation rods which are evenly distributed along the circumferential direction of the second cutting portion, installation holes for the installation rods to penetrate are formed in the first cutting portion and the clamping portion in a penetrating mode, and a locking mechanism used for fixing the installation rods is arranged at one end, away from the first cutting portion, of the clamping portion. The invention has the following advantages and effects: through setting up the modular step drill bit for can dismantle wantonly between each part of step drill bit and change, thereby realize damaging the independent maintenance of part and change, reduce the waste of resource.
Description
Technical Field
The invention relates to the field of drill bits, in particular to a step drill bit.
Background
The drill is a tool for drilling through holes or blind holes in solid materials and reaming existing holes. When part of workpieces are produced and machined, the surfaces of the workpieces are usually machined by using a step drill to form step holes required by the workpieces.
Chinese patent CN202845869U discloses a hard alloy step drill, which comprises a clamping part for clamping, the left end of the clamping part is connected with a cutting part, the cutting part comprises a first cutting part and a second cutting part, the second cutting part is connected with the clamping part, and the diameter of the first cutting part is smaller than that of the second cutting part.
When the stepped drill bit described above is used, the stepped hole is machined by the first cutting portion and the second cutting portion. Because the first cutting part and the second cutting part are integrally arranged, when any one of the first cutting part and the second cutting part is damaged, the whole drill bit needs to be replaced, so that the waste of resources is caused, and the improvement is needed.
Disclosure of Invention
The invention aims to provide a step drill which has the effect of reducing resource waste.
The technical purpose of the invention is realized by the following technical scheme: a step drill comprises a clamping part, wherein a first cutting part and a second cutting part are sequentially arranged at one end of the clamping part, the diameter of the first cutting part is larger than that of the second cutting part, and the clamping part, the first cutting part and the second cutting part are arranged in a split manner; the end face of one end, close to the first cutting portion, of the second cutting portion is provided with a plurality of installation rods which are evenly distributed along the circumferential direction of the second cutting portion, installation holes for the installation rods to penetrate through are formed in the first cutting portion and the clamping portion in a penetrating mode, and a locking mechanism used for fixing the installation rods is arranged at one end, away from the first cutting portion, of the clamping portion.
By adopting the technical scheme, when the step drill is used, the workpiece is processed by the first cutting part and the second cutting part, so that a step-shaped hole is formed on the surface of the workpiece. When any one of the first cutting part or the second cutting part is damaged, the locking mechanism is firstly released, then the second cutting part is pulled to be away from the clamping part, and the second cutting part drives the mounting rod to move synchronously, so that the second cutting part, the first cutting part and the clamping part are disassembled. Then replace the back to the part that damages, establish first cutting portion and clamping part cover again to the installation pole on, reuse locking mechanical system at last fixes the installation pole, can realize the maintenance of whole drill bit and change. Therefore, through the modular step drill bit, all parts of the step drill bit can be detached and replaced at will, so that the damaged part can be maintained and replaced independently, and the waste of resources is reduced.
The invention is further provided with: the locking mechanism comprises a turntable arranged on the end face of the clamping part and a plurality of locking rods distributed around the turntable; one end of the locking rod faces to the center of the rotary table, the other end of the locking rod is arranged in a divergent mode, a sliding block is arranged on one side, close to the clamping portion, of the locking rod, a sliding groove which is arranged along the length direction of the locking rod and used for the sliding block to slide is formed in the end face of the clamping portion, and a locking hole used for the locking rod to be inserted is formed in one end, located outside the clamping portion, of the installation rod; the turntable is rotationally connected with the clamping part and is positioned in the center of the end face of the clamping part, a plurality of convex blocks are arranged on the periphery of the turntable, the outer walls of the convex blocks are arranged in an arc shape, and the convex blocks are used for driving the locking rod to be inserted into the locking hole; the outer edge position of carousel runs through and is provided with the fixed orifices, threaded connection has the dead lever in the fixed orifices, and the terminal surface of clamping part is provided with the confession the fixed slot of dead lever grafting.
By adopting the technical scheme, when the locking mechanism is released, the fixed rod is rotated to separate the fixed rod from the fixed groove on the surface of the clamping part, then the turntable is driven to rotate, and the turntable drives the lug to synchronously rotate and gradually separate from the end part of the locking rod. Then, the locking rod can be driven to be close to the central position of the turntable, and the locking rod drives the sliding block to synchronously move and gradually separate from the locking hole in the mounting rod, so that the locking mechanism is released. When the locking mechanism is locked, the rotating disc is driven to rotate reversely, and the rotating disc drives the convex blocks to move synchronously. Meanwhile, the lug drives the locking rod to move reversely, and the locking rod drives the sliding block to slide along the inner wall of the sliding groove and is gradually inserted into the locking hole in the mounting rod. When the side wall of the sliding block abuts against the inner wall of the outer end of the sliding groove, the locking rod is inserted into the locking hole, the fixing rod is rotated to move reversely, the fixing rod is embedded into the fixing groove, limiting and fixing of the rotary table and the locking rod can be achieved, and meanwhile locking of the locking mechanism is achieved. Therefore, the structure is simple, the locking and unlocking processes of the locking mechanism are easy and convenient, the disassembly and assembly processes of the whole drill bit are easy and convenient, and the drill bit can be quickly maintained and replaced.
The invention is further provided with: the locking rod is provided with a first guide surface in an inclined mode on the side wall of one end, deviating from the rotary disc, of the locking rod, and a second guide surface which is abutted to the first guide surface is arranged in the locking hole.
Through adopting above-mentioned technical scheme, through the cooperation that sets up first spigot surface and second spigot surface for when the locking lever inserts the locking hole, can exert backward effort to the installation pole, thereby will install the pole taut voluntarily, increase the stability of being connected between second cutting portion, first cutting portion and the clamping part, stability when increasing whole drill bit use promptly.
The invention is further provided with: the outer wall of the rotary table is provided with a mark line which is aligned with the fixed rod, and the end face of the clamping part is provided with a pointer which is aligned with the fixed groove.
Through adopting above-mentioned technical scheme, through the cooperation that sets up pointer and identification line, realize carousel turned position's quick spacing to make the process of the dead lever of screwing light more convenient, realize locking mechanical system's quick locking promptly.
The invention is further provided with: and a plurality of accommodating holes for inserting steel rods are uniformly distributed on the outer wall of the rotary disc.
Through adopting above-mentioned technical scheme, when the drive carousel was rotatory, can insert the steel pole in the accommodation hole, utilize steel pole principle drive carousel rotatory for the rotation control process of carousel is lighter convenient more.
The invention is further provided with: the end face of one end, close to the first cutting portion, of the second cutting portion and the end face of one end, close to the clamping portion, of the first cutting portion are provided with splines, and the end face of one end, close to the second cutting portion, of the first cutting portion and the end face of one end, close to the first cutting portion, of the clamping portion are provided with key grooves for the splines to be embedded in.
Through adopting above-mentioned technical scheme, through the cooperation that sets up spline and keyway, the shearing force and the torsional force of antagonizing second cutting portion, first cutting portion and clamping part three hookup location jointly avoid three's hookup location fracture phenomenon to the structural strength and the stability in use of whole drill bit have been increased.
The invention is further provided with: the end face of one end, close to the first cutting portion, of the second cutting portion and the end face of one end, close to the clamping portion, of the first cutting portion are provided with a plurality of positioning grooves, the positioning grooves and the installation rod are arranged in a staggered mode, and positioning blocks used for being embedded into the positioning grooves are arranged on the end face of one end, close to the second cutting portion, of the first cutting portion and the end face of one end, close to the first cutting portion, of the clamping portion.
Through adopting above-mentioned technical scheme, through the cooperation that sets up locating piece and constant head tank, further improve the structural strength of second cutting portion, first cutting portion and clamping part three hookup location, make the connection of three fastening together fixed to the structural strength and the life of whole drill bit have been increased.
The invention is further provided with: a pair of cooling flow channels which are oppositely arranged are arranged among the clamping part, the first cutting part and the second cutting part in a penetrating way.
Through adopting above-mentioned technical scheme, when processing to the work piece, through set up the cooling runner that supplies coolant liquid to flow in the drill bit, realize the dual cooling of drill bit and work piece processing position, improve the cooling effect to the drill bit, realize the steady operation of drill bit.
The invention is further provided with: the pair of cooling channels is arranged in a double-spiral shape.
Through adopting above-mentioned technical scheme, through setting up the runner of double helix, improve the flow path of coolant liquid, improve the area of contact and the contact time of coolant liquid and drill bit simultaneously, realize the abundant cooling of drill bit, improve the cooling effect of drill bit.
In conclusion, the invention has the following beneficial effects:
1. by arranging the modular step drill bit, all parts of the step drill bit can be randomly detached and replaced, so that the damaged part can be independently repaired and replaced, and the waste of resources is reduced;
2. through the locking mechanism which is simple in structure and easy and convenient in locking and releasing processes, the whole drill bit is easier and more convenient to assemble and disassemble, and the drill bit is quickly maintained and replaced;
3. through the matching of the spline, the key groove, the positioning block and the positioning groove, the shearing force and the twisting force of the connecting positions of the second cutting part, the first cutting part and the clamping part are resisted together, and the fracture phenomenon of the connecting positions of the second cutting part, the first cutting part and the clamping part is avoided, so that the structural strength and the use stability of the whole drill bit are improved;
4. through set up the cooling flow channel that supplies coolant to flow in the drill bit, realize the dual cooling of drill bit and work piece processing position, improve the cooling effect to the drill bit, realize the steady operation of drill bit.
Drawings
FIG. 1 is a schematic structural view of an embodiment;
FIG. 2 is a schematic diagram of the connection relationship of the embodiment;
FIG. 3 is a schematic structural view of a spline and a detent of an embodiment;
FIG. 4 is a schematic structural view of a locking mechanism of an embodiment;
fig. 5 is a schematic view of a locked state of the lock mechanism of the embodiment.
Reference numerals: 1. a clamping portion; 11. a chute; 12. fixing grooves; 13. a pointer; 2. a first cutting portion; 21. a keyway; 22. positioning blocks; 3. a second cutting portion; 31. a spline; 32. positioning a groove; 4. a cooling flow channel; 5. mounting a rod; 51. a locking hole; 52. a second guide surface; 6. mounting holes; 7. a locking mechanism; 71. a turntable; 72. a locking lever; 73. a slider; 74. a first guide surface; 75. a bump; 76. an accommodation hole; 77. a fixing hole; 78. fixing the rod; 79. and marking the line.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 and 2, the stepped drill comprises a clamping part 1, wherein a first cutting part 2 and a second cutting part 3 are sequentially arranged at one end of the clamping part 1, and the diameter of the first cutting part 2 is larger than that of the second cutting part 3.
As shown in fig. 1 and 2, a pair of cooling flow passages 4 are provided between the clamping portion 1, the first cutting portion 2, and the second cutting portion 3 so as to be opposed to each other, and the pair of cooling flow passages 4 are provided in a double spiral shape.
When the drill is used, since the diameter of the first cutting portion 2 is larger than the diameter of the second cutting portion 3, the workpiece can be machined by the first cutting portion 2 and the second cutting portion 3, and a stepped hole can be formed in the surface of the workpiece.
When the drill bit is operated, the cooling liquid is injected into the double-spiral cooling flow channel 4 along the end surface of the clamping part 1, and the cooling liquid flows through the cooling flow channel 4 and then flows out along the end part of the second cutting part 3. The dual cooling of drill bit and work piece processing position can be realized this moment, improve the cooling effect to the drill bit, realize stable drilling.
As shown in fig. 1 and 2, the clamping portion 1, the first cutting portion 2, and the second cutting portion 3 are provided in a separate body, and a plurality of mounting bars 5 are provided on an end surface of the second cutting portion 3 near the first cutting portion 2 and uniformly distributed in a circumferential direction thereof.
As shown in fig. 2 and 3, the first cutting portion 2 and the clamping portion 1 are provided with a mounting hole 6 through which the mounting rod 5 passes, and one end of the clamping portion 1 away from the first cutting portion 2 is provided with a locking mechanism 7 for fixing the mounting rod 5.
When any part of the first cutting part 2, the second cutting part 3 or the clamping part 1 is damaged, the locking mechanism 7 is firstly released, then the second cutting part 3 is pulled to be far away from the clamping part 1, and at the moment, the second cutting part 3 drives the mounting rod 5 to move synchronously. The second cutting part 3, the first cutting part 2 and the clamping part 1 can be detached until the mounting rod 5 is completely separated from the mounting hole 6.
Then, after the damaged part is replaced, the first cutting part 2 and the clamping part 1 are sleeved on the mounting rod 5 again, and the joints of the first cutting part and the clamping part are abutted against each other. Finally, the mounting rod 5 is fixed by the locking mechanism 7, and the independent maintenance and replacement of the damaged position can be realized.
As shown in fig. 2 and 3, the end surface of the second cutting portion 3 near the first cutting portion 2 and the end surface of the first cutting portion 2 near the clamping portion 1 are provided with splines 31.
As shown in fig. 2 and 3, the end surface of the first cutting portion 2 near the second cutting portion 3 and the end surface of the clamping portion 1 near the first cutting portion 2 are provided with key grooves 21 into which the splines 31 are inserted.
As shown in fig. 2 and 3, a plurality of positioning grooves 32 are formed in both the end surface of the second cutting portion 3 close to the first cutting portion 2 and the end surface of the first cutting portion 2 close to the clamping portion 1, and the positioning grooves 32 and the mounting rods 5 are arranged in a staggered manner.
As shown in fig. 2 and 3, the end surface of the first cutting portion 2 near the second cutting portion 3 and the end surface of the clamping portion 1 near the first cutting portion 2 are provided with positioning blocks 22 for being inserted into the positioning grooves 32.
When the drill bit is in use, through the supporting force that sets up spline 31 grafting keyway 21, locating piece 22 grafting constant head tank 32 and installation pole 5 self, confront the shear force and the distortion power of second cutting portion 3, first cutting portion 2 and the 1 three hookup location of clamping part jointly to avoid the rupture or damage phenomenon to appear in three's hookup location, thereby increased the structural strength, the stability in use and the life of whole drill bit.
As shown in fig. 4 and 5, the locking mechanism 7 includes a rotary disc 71 disposed on the end surface of the clamping portion 1 and a plurality of locking levers 72 distributed around the rotary disc 71, and one end of each locking lever 72 faces the center of the rotary disc 71 and the other end is disposed in a diverging manner.
As shown in fig. 4 and 5, a slider 73 is provided on one side of the lock lever 72 close to the clamp portion 1, and a slide groove 11 which is provided along the longitudinal direction of the lock lever 72 and through which the slider 73 slides is provided on the end surface of the clamp portion 1.
As shown in fig. 4 and 5, a locking hole 51 into which the locking rod 72 is inserted is formed in one end of the mounting rod 5 located outside the clamping portion 1, a first guide surface 74 is obliquely formed on a side wall of one end of the locking rod 72 facing away from the rotating disc 71, and a second guide surface 52 which is in contact with the first guide surface 74 is formed in the locking hole 51.
As shown in fig. 4 and 5, the turntable 71 is rotatably connected to the clamping portion 1 and is located at the center of the end surface of the clamping portion 1. All be provided with a plurality of lugs 75 around carousel 71, the outer wall of lug 75 is circular-arc setting to carousel 71's outer wall still equipartition has a plurality of accommodation holes 76 that are used for supplying steel pole to insert.
As shown in fig. 4 and 5, a fixing hole 77 is formed through an outer edge position of the rotary plate 71, a fixing rod 78 is connected to the fixing hole 77 through a thread, and a fixing groove 12 into which the fixing rod 78 is inserted is formed on an end surface of the clamping portion 1.
As shown in fig. 4 and 5, the outer wall of the rotary disk 71 is provided with a mark line 79 aligned with the fixing rod 78, and the end surface of the clamping portion 1 is provided with the pointer 13 aligned with the fixing groove 12.
When the locking mechanism 7 is released, the fixing rod 78 is rotated to make the fixing rod 78 disengage from the fixing groove 12 on the surface of the clamping part 1, then the steel rod is inserted into the accommodating hole 76 around the rotary disc 71 to drive the rotary disc 71 to rotate, and at this time, the rotary disc 71 drives the lug 75 to synchronously rotate and gradually disengage from the end of the locking rod 72. The locking rod 72 is then driven to approach the center of the rotary disk 71, and the locking rod 72 drives the slider 73 to move synchronously and gradually disengage from the locking hole 51 of the mounting rod 5, thereby releasing the locking mechanism 7.
When the locking mechanism 7 is locked, the steel rod is used for driving the rotary disc 71 to rotate reversely, and at the moment, the rotary disc 71 drives the lug 75 to move synchronously. At the same time, the projection 75 drives the locking rod 72 to move reversely, and the locking rod 72 drives the sliding block 73 to slide along the inner wall of the sliding chute 11 and gradually plug into the locking hole 51 on the mounting rod 5.
When the locking rod 72 is inserted into the locking hole 51, the locking rod 72 applies a backward acting force to the mounting rod 5 through the cooperation of the first guide surface 74 and the second guide surface 52, so that the mounting rod 5 is automatically tensioned, and the abutting and pressing among the second cutting part 3, the first cutting part 2 and the clamping part 1 are realized.
When the side wall of the sliding block 73 is tightly pressed against the inner wall of the outer end of the sliding chute 11, the locking rod 72 is inserted into the locking hole 51, and the pointer 13 is aligned with the identification line 79. Finally, the fixing rod 78 is rotated to move reversely, so that the fixing rod 78 is embedded into the fixing groove 12, and the limiting and fixing of the rotary disc 71 and the locking rod 72 can be realized, and the locking of the locking mechanism 7 can be realized.
The specific embodiments are only for explaining the present invention, and the present invention is not limited thereto, and those skilled in the art can make modifications without inventive contribution to the present embodiments as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (8)
1. The utility model provides a step drill, includes clamping part (1), the one end of clamping part (1) has set gradually first cutting portion (2) and second cutting portion (3) to the diameter of first cutting portion (2) is greater than the diameter of second cutting portion (3), its characterized in that: the clamping part (1), the first cutting part (2) and the second cutting part (3) are arranged in a split manner;
a plurality of mounting rods (5) uniformly distributed along the circumferential direction are arranged on the end face of one end, close to the first cutting part (2), of the second cutting part (3), mounting holes (6) for the mounting rods (5) to penetrate through are formed in the first cutting part (2) and the clamping part (1) in a penetrating mode, and a locking mechanism (7) used for fixing the mounting rods (5) is arranged at one end, away from the first cutting part (2), of the clamping part (1);
the locking mechanism (7) comprises a rotary disc (71) arranged on the end face of the clamping part (1) and a plurality of locking rods (72) distributed around the rotary disc (71);
one end of the locking rod (72) faces to the center of the rotary disc (71), the other end of the locking rod is arranged in a divergent mode, a sliding block (73) is arranged on one side, close to the clamping part (1), of the locking rod (72), a sliding groove (11) which is arranged along the length direction of the locking rod (72) and used for the sliding of the sliding block (73) is formed in the end face of the clamping part (1), and a locking hole (51) used for the locking rod (72) to be inserted is formed in one end, located outside the clamping part (1), of the installation rod (5);
the turntable (71) is rotatably connected to the clamping part (1) and is positioned in the center of the end face of the clamping part (1), a plurality of convex blocks (75) are arranged on the periphery of the turntable (71), the outer walls of the convex blocks (75) are arranged in an arc shape, and the convex blocks are used for driving the locking rod (72) to be inserted into the locking holes (51);
the outer edge position of carousel (71) is run through and is provided with fixed orifices (77), fixed orifices (77) threaded connection has dead lever (78), and the terminal surface of clamping part (1) is provided with the confession fixed slot (12) that dead lever (78) are pegged graft.
2. A step drill according to claim 1, wherein: the side wall of one end, deviating from the rotary disc (71), of the locking rod (72) is obliquely provided with a first guide surface (74), and a second guide surface (52) which is in contact with the first guide surface (74) is arranged in the locking hole (51).
3. A step drill according to claim 2, wherein: the outer wall of the rotary disc (71) is provided with a mark line (79) aligned with the fixing rod (78), and the end face of the clamping part (1) is provided with a pointer (13) aligned with the fixing groove (12).
4. A step drill according to claim 3, wherein: a plurality of accommodating holes (76) for inserting steel rods are uniformly distributed on the outer wall of the rotary disc (71).
5. A step drill according to claim 1, wherein: the end face of one end, close to the first cutting portion (2), of the second cutting portion (3) and the end face of one end, close to the clamping portion (1), of the first cutting portion (2) are provided with splines (31), and the end face of one end, close to the second cutting portion (3), of the first cutting portion (2) and the end face of one end, close to the first cutting portion (2), of the clamping portion (1) are provided with key grooves (21) for the splines (31) to be embedded into.
6. A step drill according to claim 5, wherein: the end face of one end, close to the first cutting portion (2), of the second cutting portion (3) and the end face of one end, close to the clamping portion (1), of the first cutting portion (2) are provided with a plurality of positioning grooves (32), the positioning grooves (32) and the installation rod (5) are arranged in a staggered mode, and the end face of one end, close to the second cutting portion (3), of the first cutting portion (2) and the end face of one end, close to the first cutting portion (2), of the clamping portion (1) are provided with positioning blocks (22) used for being embedded into the positioning grooves (32).
7. A step drill according to claim 1, wherein: a pair of cooling flow channels (4) which are oppositely arranged are arranged among the clamping part (1), the first cutting part (2) and the second cutting part (3) in a penetrating way.
8. A step drill according to claim 7, wherein: the pair of cooling channels (4) are arranged in a double-spiral manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010637195.6A CN111774618B (en) | 2020-07-03 | 2020-07-03 | Step drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010637195.6A CN111774618B (en) | 2020-07-03 | 2020-07-03 | Step drill bit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111774618A CN111774618A (en) | 2020-10-16 |
| CN111774618B true CN111774618B (en) | 2021-06-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010637195.6A Active CN111774618B (en) | 2020-07-03 | 2020-07-03 | Step drill bit |
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| Country | Link |
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| CN (1) | CN111774618B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114029532A (en) * | 2021-12-13 | 2022-02-11 | 株洲钻石切削刀具股份有限公司 | Modular drilling machining tool |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3994615A (en) * | 1975-06-12 | 1976-11-30 | Narang Rajendra K | Multiple part cutting tool |
| SE426148B (en) * | 1981-10-12 | 1982-12-13 | Hugo Linden | BUILDING BORR |
| CN2739193Y (en) * | 2004-10-28 | 2005-11-09 | 欧阳雁群 | Sectional rod for blast furnace opening machine |
| JP5522581B1 (en) * | 2013-02-06 | 2014-06-18 | 株式会社富士倉 | Twist drill |
| CN104174905A (en) * | 2013-05-21 | 2014-12-03 | 苏州锑玛精密机械有限公司 | Diameter-reducing internal-cooled drill |
| CN104416202A (en) * | 2013-09-02 | 2015-03-18 | 天工爱和特钢有限公司 | Multi-sectional drill bit |
| ITBZ20130059A1 (en) * | 2013-11-25 | 2015-05-26 | Intercable Srl | HELICOIDAL DRILL TIP AND PROCEDURE FOR ITS PRODUCTION |
| CN106077768B (en) * | 2016-06-14 | 2018-07-13 | 大连理工大学 | A kind of mostly micro- cutting drill head of the multi-ladder of carbon fibre reinforced composite drilling |
| CN207952725U (en) * | 2018-03-26 | 2018-10-12 | 江苏省泗洪中学 | A kind of segmented grooved bit |
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2020
- 2020-07-03 CN CN202010637195.6A patent/CN111774618B/en active Active
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| CN111774618A (en) | 2020-10-16 |
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Denomination of invention: a step drill Effective date of registration: 20220912 Granted publication date: 20210618 Pledgee: Zhejiang Wenling Rural Commercial Bank Co.,Ltd. Pledgor: Taizhou yingluoke Tools Co.,Ltd. Registration number: Y2022330002184 |