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CN112809058B - A new type of cooling back-pull crown drill - Google Patents

A new type of cooling back-pull crown drill Download PDF

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Publication number
CN112809058B
CN112809058B CN202110024779.0A CN202110024779A CN112809058B CN 112809058 B CN112809058 B CN 112809058B CN 202110024779 A CN202110024779 A CN 202110024779A CN 112809058 B CN112809058 B CN 112809058B
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China
Prior art keywords
crown
bit
drill rod
drill
working part
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Application number
CN202110024779.0A
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Chinese (zh)
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CN112809058A (en
Inventor
殷亚军
欧望达
沈钰
甘其龙
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Suzhou Ahno Precision Cutting Tool Technology Co Ltd
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Suzhou Ahno Precision Cutting Tool Technology Co Ltd
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Application filed by Suzhou Ahno Precision Cutting Tool Technology Co Ltd filed Critical Suzhou Ahno Precision Cutting Tool Technology Co Ltd
Priority to CN202110024779.0A priority Critical patent/CN112809058B/en
Publication of CN112809058A publication Critical patent/CN112809058A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B51/00Tools for drilling machines
    • B23B51/06Drills with lubricating or cooling equipment

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
  • Drilling Tools (AREA)

Abstract

The invention provides a novel cooling back-pull type crown drill, which ensures that the crown drill is locked through a back-pull structure and a drill rod, ensures that the locking is stable and reliable, and ensures that cooling liquid directly cools the cutting edge of the crown drill, and has good cooling effect. The drill rod comprises a working part, a neck part and a handle part, wherein a spiral chip groove and a cutter back are formed in the periphery of the working part of the drill rod, a tooth crown cutter head positioning cavity is formed in the front end center position of the working part in a concave mode, the tooth crown cutter head is embedded in the tooth crown cutter head positioning cavity, the tooth crown cutter head comprises a locking threaded hole with a concave rear end, the locking threaded hole of the tooth crown cutter head is connected with a front end thread of a tensioning screw, the inner axial end of the tooth crown cutter head positioning cavity of the working part is provided with a concave center threaded hole, the rear end thread of the tensioning screw is connected with the concave center threaded hole, the rotation directions of the front end thread and the rear end thread of the tensioning screw are opposite, and a main cooling hole is formed in the axial center position of the drill rod.

Description

Novel cooling back-pull type crown drill bit
Technical Field
The invention relates to the technical field of cutting tool structures, in particular to a novel cooling back-pull type crown drill bit.
Background
With the rapid development of engineering machinery, heat exchangers, wind power and other industries, large-diameter holes are increasingly machined, the whole hard alloy drill bit is high in price and machining cost, the crown drill bit is a combined drill bit with a head made of hard alloy or other high-performance materials, and a drill rod is made of alloy steel materials. Is suitable for processing large-diameter holes, and has the advantages of low use cost, large processing range and the like.
At present, the head of the crown bit and the drill rod are in various combination modes, the cooling mode is that cooling holes are sprayed to inclined planes at two sides, the cutting edge of the crown bit cannot be cooled directly, and the cooling effect is poor.
Disclosure of Invention
Aiming at the problems, the invention provides a novel cooling back-pull type crown drill, which ensures that the crown drill is locked through a back-pull structure and a drill rod, ensures that the locking is stable and reliable, and ensures that cooling liquid directly cools the cutting edge of the crown drill, so that the cooling effect is good.
A novel cooling back-pull type crown drill bit is characterized by comprising a drill rod and a crown bit, wherein the drill rod comprises a working part, a neck and a handle, a spiral chip groove and a cutter back are formed in the periphery of the working part of the drill rod, a crown bit positioning cavity is formed in the front end center position of the working part in a concave mode, the crown bit is embedded in the crown bit positioning cavity, the crown bit comprises a locking threaded hole with a concave rear end, the locking threaded hole of the crown bit is connected with a front end thread of a tensioning screw, the axial inner end of the crown bit positioning cavity of the working part is provided with a concave center threaded hole, the rear end threads of the tensioning screw are connected with the concave center threaded hole, the front end threads of the tensioning screw are opposite to the rear end threads, a main cooling hole is formed in a communicating mode, at least two bypass pipelines are arranged on the periphery of the front end of the main cooling hole, facing the working part, the crown bit positioning cavity is provided with two liquid outlet holes, and the liquid outlet holes are formed in a position of the crown bit positioning cavity, and the liquid outlet structure is formed in a state of being assembled to the whole face of the crown bit.
It is further characterized by:
the obtuse angle positioning surfaces on two sides of the crown bit are of symmetrical structures;
The section of the spiral chip groove is of a U-shaped groove structure, and a protective knife edge is arranged in the spiral chip groove, so that the groove body structure of the U-shaped groove has the advantages that the chip containing space is large, chip removal is smooth, meanwhile, the strength of the back of the knife is high, the feeding speed is high during processing, the protective knife edge reduces the front angle of the groove of the outer diameter part, and the knife breaking caused by the participation of a drill rod in cutting under severe working conditions is prevented;
two bypass pipelines are arranged on the periphery of the front end of the main cooling hole, which faces the working part, and Y-shaped passage outlets are formed and are respectively communicated with the liquid outlet through branches;
the shank of the drill rod is provided with a lateral pressing surface inclined by 2 degrees, and is locked by a shank lateral pressing locking screw, and when the drill rod is used, the shank is clamped by the shank to transmit power of a machine tool, so that the cutter rotates and has cutting capability;
The neck is a cone and cylinder combination, and during operation, the neck can prevent chips from splashing to strike the tool handle and the machine tool spindle, thereby playing a role in protection.
After the invention is adopted, the locking threaded hole of the tooth crown bit is connected with at least one part of the front end thread of the tension screw, a certain front end thread screwing installation clearance is reserved during preassembly, then the tooth crown bit is positioned in the tooth crown bit positioning cavity, the rear end thread of the tension screw is connected with the concave central threaded hole, the inner hexagonal spanner penetrates through the main cooling hole and then screws the tension screw, so that the rear end thread of the tension screw is connected with the concave central threaded hole, the rear end surface of the tooth crown bit and the plane of the end stop surface of the tooth crown bit positioning cavity are tightly attached to complete tensioning and locking, the tooth crown bit is locked through a back-pull structure and a drill rod, so that locking is stable and reliable, in addition, cooling liquid is communicated to a liquid outlet and a liquid outlet notch through the main cooling hole, the cooling liquid directly cools the cutting edge of the tooth crown bit, and the cooling effect is good.
Drawings
FIG. 1 is a schematic diagram of a front view structure of the present invention;
FIG. 2 is a schematic view (partially cut-away) of an exploded view of the present invention;
FIG. 3 is a left side view of the schematic diagram of FIG. 1;
FIG. 4 is a schematic view of the structure of section A-A of FIG. 2;
FIG. 5 is a schematic view of the B-B cross-section structure of FIG. 2;
the names corresponding to the serial numbers in the figures are as follows:
The drill rod 1, the working part 11, the neck part 12, the handle part 13, the spiral chip groove 14, the tool back 15, the tooth crown tool bit positioning cavity 16, the concave center threaded hole 17, the protective tool edge 18, the side pressure surface 19, the tooth crown tool bit 2, the locking threaded hole 21, the obtuse angle positioning surface 22, the tensioning screw 3, the front end thread 31, the rear end thread 32, the main cooling hole 4, the bypass pipeline 5, the liquid outlet 6, the liquid outlet notch 7 and the branch 8.
Detailed Description
The novel cooling back-pull type tooth crown drill bit is shown in figures 1-5, the novel cooling back-pull type tooth crown drill bit comprises a drill rod 1 and a tooth crown bit 2, wherein the drill rod 1 comprises a working part 11, a neck part 12 and a handle part 13, a spiral chip groove 14 and a tool back 15 are arranged on the periphery of the working part 11 of the drill rod 1, the front end center position of the working part 11 is concaved inwards to form a tooth crown bit positioning cavity 16, the tooth crown bit 2 is embedded in the tooth crown bit positioning cavity 16, the tooth crown bit 2 comprises a locking threaded hole 21 with a concave rear end, the locking threaded hole 21 of the tooth crown bit 21 is connected with a front end thread 31 of a tensioning screw 3, an inner concave center threaded hole 17 is arranged at the axial inner end of the tooth crown bit positioning cavity 16 of the working part 11, a rear end thread 32 of the tensioning screw 3 is connected with the concave center threaded hole 17, the front end thread 31 of the tensioning screw 3 is opposite to the rear end thread 32 in rotation direction, a main cooling hole 4 is arranged at the axial center position of the drill rod 1, the concave center threaded hole 17 is communicated with the main cooling hole 4, at least two bypass pipelines 5 are arranged on the periphery of the front end of the main cooling hole 4 facing the working part 11, the tooth crown bit positioning cavity 6 is arranged at the position of the end face of the end of the tooth crown bit, and the end face 6 is arranged at a liquid outlet end position corresponding to the liquid outlet end position of the stop face 6 of the tooth crown bit 2, and the tooth crown bit is arranged in a liquid outlet position corresponding to the position of the liquid outlet end face 6, and the position is arranged in a state of the liquid outlet face is positioned in a state and is in a state in close state and is in a state and is in close to and positioned; the crown head 2 and the working portion 11 of the drill rod 1 are assembled in place to form a unitary drill structure.
The obtuse angle locating surfaces 22 on the two sides of the crown bit 2 are of symmetrical structures, and the angulation of the obtuse angle locating surfaces 22 is specifically 120-150 degrees.
In practice, the front thread 31 of the tightening screw 3 is embodied as a right-handed thread and the rear thread 32 is embodied as a left-handed thread.
The section of the spiral chip groove 14 is of a U-shaped groove structure, and a protective cutter edge 18 is arranged in the spiral chip groove 14, so that the chip accommodating space is large, chip removal is smooth, meanwhile, the strength of the back of the cutter is high, the feeding speed is high during processing, the protective cutter edge 18 reduces the front angle of a part of the groove with the outer diameter, and the cutter breakage caused by the participation of a drill rod in cutting under severe working conditions is prevented;
The front end periphery of the main cooling hole 4 facing the working part 11 is provided with two bypass pipelines 5 to form Y-shaped passage outlets which are respectively communicated to the liquid outlet 6 through branches 8, cooling liquid is supplied to the crown bit 2 during working, the cooling liquid of the main cooling hole 4 is sprayed out from the liquid outlet of the front end surface in a twice switching mode, and the cutting edges of the crown bit 2 are directly sprayed. ;
the shank 13 of the drill rod 1 is provided with a lateral pressing surface 19 inclined by 2 degrees, and is locked by a shank lateral pressing locking screw, and when in use, the shank is clamped by the shank to transmit the power of a machine tool, so that the tool rotates and has cutting capability;
the neck 12 is a cone and cylinder combination which, in operation, prevents swarf from splashing against the shank and spindle of the machine tool, protecting it.
The locking threaded hole of the tooth crown bit is connected with at least one part of the front end threads of the tension screw, a certain front end thread screwing installation clearance is reserved during preassembly, then the tooth crown bit is positioned in the tooth crown bit positioning cavity, the rear end threads of the tension screw are connected with the concave central threaded hole, the inner hexagonal wrench penetrates through the main cooling hole and then screws the tension screw, the rear end threads of the tension screw are connected with the concave central threaded hole, meanwhile, the rear end face of the tooth crown bit and the plane of the end stop surface of the tooth crown bit positioning cavity are tightly attached to each other, tensioning and locking are completed, the tooth crown bit is locked through a back-pull structure and a drill rod, locking is stable and reliable, in addition, cooling liquid is communicated to a liquid outlet and a liquid outlet notch through the main cooling hole, the cooling liquid directly cools the cutting edge of the tooth crown bit, and the cooling effect is good.
The rear pulling type crown drill bit adopts center rear pulling type locking, has large tension force, reliable installation and no looseness in the processing process, adopts a left-right rotation design for a center rear pulling locking screw, is convenient to install and no looseness in the processing process, has high matching precision with a locking screw for tightening a left-rotation screw at the center of a drill rod, effectively prevents leakage of a cooling liquid center, thereby affecting the cooling effect, adopts an obtuse angle design for positioning surfaces at two sides of the drill rod, has an angle of 100-154 DEG, is beneficial to large area of a supporting part of the drill rod and high supporting strength, and adopts high-strength alloy steel for drill rod materials, and has the advantages of high strength, good wear resistance, good shock resistance and long service life.
The novel internal cooling type drill rod has the advantages that the cutting edge is directly cooled by cooling liquid on the basis of a Y-shaped internal cooling structure, a good cooling effect is achieved on heat generated during machining, meanwhile, due to the fact that the diameters of cooling holes are different, cooling pressure is further improved due to the fact that large-diameter water flows into and small-diameter water flows out, the chip groove type is of a U-shaped design, the cutter rod is good in rigidity, can bear large-feed machining and is not easy to break, the U-shaped groove is provided with a protective cutter edge design, the front cutter face of the drill rod is effectively prevented from being broken due to cutting and extrusion, the front end of the drill rod is provided with a supporting face, an effective supporting effect is achieved during drilling machining, drilling is stable, the drill rod handle is inclined by 2-degree lateral pressure faces, and axial displacement of the drill bit is prevented from loosening during machining after installation and locking.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims (4)

1. The novel cooling back-pull type crown drill bit is characterized by comprising a drill rod and a crown bit, wherein the drill rod comprises a working part, a neck part and a handle part, the periphery of the working part of the drill rod is provided with a spiral chip groove and a cutter back, the center position of the front end of the working part is concaved inwards to form a crown bit positioning cavity, the crown bit is embedded in the crown bit positioning cavity, the crown bit comprises a locking threaded hole with a concave rear end, the locking threaded hole of the crown bit is connected with the front end thread of a tensioning screw, the axial inner end of the crown bit positioning cavity of the working part is provided with a concave center threaded hole, the rear end thread of the tensioning screw is connected with the concave center threaded hole, the front end thread of the tensioning screw is opposite to the rear end thread, the axial center position of the drill rod is provided with a main cooling hole, the periphery of the front end of the main cooling hole facing the working part is provided with at least two bypass pipelines, the positions of the main cooling hole facing the end of the crown bit positioning cavity are provided with liquid outlet holes, and the crown bit is arranged at positions of the end face of the end of the head of the tooth cap positioning cavity, and the end face of the head is tightly attached to the end face of the drill bit, and the end face of the head is assembled to form a liquid outlet face of the whole structure;
two bypass pipelines are arranged on the periphery of the front end of the main cooling hole, which faces the working part, and Y-shaped passage outlets are formed and are respectively communicated with the liquid outlet through branches;
the obtuse angle locating surfaces on two sides of the tooth crown tool bit are of symmetrical structures.
2. The novel cooling back-pull crown drill of claim 1, wherein the cross section of the spiral chip groove is of a U-shaped groove structure, and a protective knife edge is arranged in the spiral chip groove.
3. The cooling back-pull crown bit of claim 1 wherein the shank portion of the drill rod has a side flank surface inclined at 2 °.
4. A novel cooled pull back crown bit of claim 1 wherein the neck is a cone and cylinder combination.
CN202110024779.0A 2021-01-08 2021-01-08 A new type of cooling back-pull crown drill Active CN112809058B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110024779.0A CN112809058B (en) 2021-01-08 2021-01-08 A new type of cooling back-pull crown drill

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110024779.0A CN112809058B (en) 2021-01-08 2021-01-08 A new type of cooling back-pull crown drill

Publications (2)

Publication Number Publication Date
CN112809058A CN112809058A (en) 2021-05-18
CN112809058B true CN112809058B (en) 2025-04-15

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2235346Y (en) * 1995-08-09 1996-09-18 张红旗 No grind drilling machine with central cooling
CN112157300A (en) * 2020-10-20 2021-01-01 苏州阿诺精密切削技术有限公司 Asymmetric back-pull type tooth crown drill bit
CN214517779U (en) * 2021-01-08 2021-10-29 苏州阿诺精密切削技术有限公司 A New Type of Cooling Back-pull Crown Bit

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014119295B4 (en) * 2014-12-19 2023-08-10 Kennametal Inc. Tool holder for a cutting insert and method for manufacturing the tool holder

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2235346Y (en) * 1995-08-09 1996-09-18 张红旗 No grind drilling machine with central cooling
CN112157300A (en) * 2020-10-20 2021-01-01 苏州阿诺精密切削技术有限公司 Asymmetric back-pull type tooth crown drill bit
CN214517779U (en) * 2021-01-08 2021-10-29 苏州阿诺精密切削技术有限公司 A New Type of Cooling Back-pull Crown Bit

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