CN112157299A - Round pin centering double-limit side pressure locking crown drill bit - Google Patents
Round pin centering double-limit side pressure locking crown drill bit Download PDFInfo
- Publication number
- CN112157299A CN112157299A CN202011127545.0A CN202011127545A CN112157299A CN 112157299 A CN112157299 A CN 112157299A CN 202011127545 A CN202011127545 A CN 202011127545A CN 112157299 A CN112157299 A CN 112157299A
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- Prior art keywords
- crown
- centering
- double
- hole
- working part
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/02—Connections between shanks and removable cutting heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/40—Flutes, i.e. chip conveying grooves
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to a round pin centering double-limit side pressure locking crown drill bit, wherein a working part is provided with a chip groove and a cutter back, a drill rod is internally provided with a main cooling hole, the left end surface of the working part of the main cooling hole is provided with two water outlet holes to form a Y-shaped structure, the left end of the working part is provided with a center hole, one side of the center hole is provided with a fastening threaded hole and a counter bore, the central axes of the fastening threaded hole and the counter bore are not overlapped, two sides of the left end surface of the working part form an L-shaped double-limit surface, and a crown cutter head extends into the center hole and is. The round pin centering double-limit side pressure locking tooth crown drill bit provided by the invention adopts the cylindrical pin for centering, the cylindrical pin locking surface of the tooth crown tool bit is not perpendicular to the central axis of the compression screw, and the L-shaped double-limit surfaces on the upper side and the lower side of the left end of the working part are eccentrically arranged with the centering hole, so that the error in installation is effectively prevented, the side pressure looseness is avoided, and the like.
Description
Technical Field
The invention belongs to the technical field of precise and efficient metal cutting tools, and particularly relates to a round pin centering double-limit side pressure locking crown drill bit.
Background
The crown bit is a combined bit formed by a head and a drill rod, the head is made of hard alloy or other high-performance materials, the drill rod is made of alloy steel materials, and the crown bit is suitable for machining large-diameter holes and has the advantages of low use cost, large machining range and the like. At present, the head part of the crown drill bit and a drill rod have a plurality of combination modes, but most of the crown drill bits have complex structures, low tool bit assembly precision, high manufacturing cost and small bearing torque force. Therefore, a novel crown and cutter head combination mode which is high in precision and large in bearing torsion is found to be a research hotspot of people.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention aims to provide a round pin centering double-limiting side pressure locking crown drill bit.
In order to achieve the purpose and achieve the technical effect, the invention adopts the technical scheme that:
a round pin centering double-limit side pressure locking crown drill bit comprises a drill rod, a crown cutter head and a compression screw which are matched, the drilling rod includes the working portion that connects in proper order, neck and stalk portion, the working portion is equipped with spiral helicine chip groove and back of a knife blade, the solid part that removes the chip groove in the working portion is the back of a knife blade, the inside main cooling hole that is equipped with of drilling rod, run through the working portion, neck and stalk portion, main cooling hole has two apopores at the left end face of working portion, form Y type structure, the inside left end of working portion is equipped with centering hole, centering hole one side sets up fastening screw hole and counter bore, the axis of fastening screw hole and counter bore does not coincide, the two spacing faces of working portion left end face both sides formation L type, the cylindric lock of crown tool bit stretches into centering downthehole and locks on the drilling rod through housing screw, the cylindric lock face of crown tool bit is out of plumb with housing screw's axis, the two spacing faces of L type of drilling rod are laminated mutually with.
Furthermore, the working part, the neck part and the handle part are sequentially connected from left to right and are coaxial.
Furthermore, a centering hole is formed in the left end of the inner portion of the working portion along the central axis, the eccentricity between the axis of the counter bore and the axis of the fastening threaded hole at the bottom is 0.02-0.1mm, and a compression screw generates friction force with the counter bore when being screwed into the fastening threaded hole so as to fasten the crown cutter head.
Furthermore, an included angle formed between the cylindrical pin locking surface of the crown bit and the central axis of the compression screw is 70-88 degrees.
Further, the neck portion is provided with a transition groove for reducing the arc transition of stress concentration.
Furthermore, the handle part is of a cylindrical structure, a side pressing surface is transversely arranged at the top of the handle part, and a decontamination groove is formed in the right end face of the handle part.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a round pin centering double-limit side pressure locking crown drill bit, which comprises a drill rod, a crown tool bit and a compression screw which are matched, wherein the drill rod comprises a working part, a neck part and a handle part which are sequentially connected, the working part is provided with a spiral chip removal groove and a tool back, the solid part except the chip removal groove on the working part is the tool back, a main cooling hole is arranged in the drill rod and penetrates through the neck part and the handle part, the left end surface of the working part of the main cooling hole is provided with two water outlet holes to form a Y-shaped structure, the center position of the left end in the working part is provided with a centering hole, one side of the centering hole is provided with a fastening threaded hole and a counter bore, the fastening threaded hole is not overlapped with the central axis of the counter bore, two sides of the left end surface of the working part form an L-shaped double-limit surface, a cylindrical pin of the crown tool bit extends into the centering hole and is locked, the L-shaped double limiting surfaces of the drill rod are attached to the double limiting surfaces of the crown cutter head. The invention provides a round pin centering double-limit side pressure locking crown drill bit, when a crown bit is centered by a cylindrical pin and locked on a drill rod through a compression screw, a cylindrical pin locking surface of the crown bit is not perpendicular to a central axis of the compression screw, a radial circumferential direction thrust is automatically generated when the compression screw is locked, stable cutting is ensured, L-shaped double-limit surfaces on the upper side and the lower side of the left end surface of a working part are closely attached and limited with double-limit surfaces matched with the crown bit, the L-shaped double-limit surfaces on the upper side and the lower side of the left end surface of the working part are eccentrically arranged with a centering hole, an eccentric design thought is adopted, installation errors are effectively prevented, loosening and falling and the like in the drilling process due to insufficient side pressure locking force are avoided, the L-shaped double-limit surfaces are designed by adopting an included angle of 90 degrees, the round pin centering double-limit side pressure locking crown drill bit is simple to manufacture, high in, the tool bit has the characteristics of simple structure, high tool bit assembly precision, high centering precision, large double-limit bearing torsion, firm locking and low cost, and is very suitable for large-diameter large-torsion precision machining.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a perspective view of the drill stem of the present invention;
FIG. 3 is an enlarged partial view of the side pressure surface of FIG. 2 in accordance with the present invention;
FIG. 4 is a front view of the drill stem of the present invention;
FIG. 5 is a cross-sectional view taken along line A-A of FIG. 4 in accordance with the present invention;
FIG. 6 is a schematic view of the compression screw of the present invention screwed into a fastening threaded hole;
FIG. 7 is a schematic view of the crown bit of the present invention secured to a drill rod by a compression screw;
figures 8-9 are schematic perspective views of the crown bit of the present invention, respectively;
FIG. 10 is a front view of the crown bit of the present invention;
fig. 11 is a side view of the crown bit of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention is provided to enable those skilled in the art to more easily understand the advantages and features of the present invention, and to clearly and clearly define the scope of the present invention.
As shown in figures 1-11, a round pin centering double-limit side pressure locking crown drill bit is positioned by a cylindrical pin, and comprises a drill rod 1, a crown bit 2 and a compression screw 3, wherein the drill rod 1 comprises a working part 4, a neck part 5 and a handle part 6 which are sequentially connected from left to right, the working part 4, the neck part 5 and the handle part 6 form a coaxial cylinder structure by taking the same central axis as the center, a centering hole 10 is arranged in the middle of the left end surface inside the working part 4 and used for ensuring the centering precision of the crown bit 2 to be within 0.02mm, the cylindrical pin at the right end of the crown bit 2 extends into the cylindrical centering hole 10 matched with the cylindrical pin and is vertically screwed by the compression screw 3 to fix the crown bit 2 on the drill rod 1, the left end surface of the working part 4 forms a U-like structure, L-shaped double-limit surfaces 9 formed on the upper side and the lower side of the left end surface of the working part 4 are precisely matched with the double-, supporting the radial cutting force of the crown cutter head 2.
Work portion 4 is equipped with spiral helicine chip groove 7 and back of a knife blade 8, chip groove 7 plays the bits and chip removal effect at the during operation, the solid part that removes chip groove 7 on work portion 4 is back of a knife blade 8, main cooling hole 14 designs inside drilling rod 1, run through the inside of neck 5 and stalk portion 6, main cooling hole 14 is opened at the left end face of work portion 4 has two apopores 15, provide the coolant liquid for crown tool bit 2 at the during operation, two apopores 15 form Y type structure with main cooling hole 14.
A fastening threaded hole 16 and a counter bore 17 are arranged on one side face of the centering hole 10, the central axis of the counter bore 17 is not overlapped with the central axis of the fastening threaded hole 16 at the bottom, the eccentricity H is 0.02-0.1mm, and when the compression screw 3 is screwed into the fastening threaded hole 16, a certain friction force is generated between the compression screw and the counter bore 17 to fasten the crown bit 2.
The locking surface on the cylindrical pin of the crown bit 2 and the axis of the compression screw 3 are designed in a non-vertical mode to form an acute angle 20 on one side, the value range of the acute angle 20 is 70-88 degrees, when the compression screw 3 is locked, a radial circumferential thrust is automatically generated, the L-shaped double limiting surfaces 9 of the drill rod 1 are precisely attached to the double limiting surfaces on the crown bit 2, stable cutting is guaranteed, and the service life of a cutter is prolonged.
The L-shaped double limiting surfaces 9 on the upper side and the lower side of the left end surface of the drill rod 1 can adopt a non-centrosymmetric design idea, the center of the L-shaped double limiting surfaces and the centering hole 10 are eccentrically arranged, the eccentricity is 0.02-0.2mm, and the situation that the tool bit cannot be locked and fall off due to the installation error of the side pressure locking surface of the tool bit is effectively prevented.
The neck 5 is a combination formed by a cone at the left end and a cylinder at the right end, so that chips can be prevented from splashing and impacting the handle 6 and a machine tool spindle during working, a protection effect is achieved, the transition groove 11 above the neck 5 adopts circular arc transition, stress concentration is effectively reduced, and the strength of the drill rod 1 is increased.
The stalk portion 6 is a section of cylinder that the circle precision is higher, is convenient for install centering on the handle of a knife, and 6 tops of stalk portion are equipped with side pressure face 12, through handle of a knife side pressure screw fixed tooth crown drill bit during the use, can bear big moment of torsion cutting, and 6 right-hand members of stalk portion are equipped with decontamination groove 13, prevent effectively that tiny iron fillings from inserting into the 6 cylindrical surface of stalk portion, avoid influencing the clamping precision, and the inside main cooling hole 14 that sets up that runs through of axis along it of stalk portion 6 can convey the coolant liquid of lathe cooling system on the cutter.
As a specific embodiment, the crown bit 2 of the present invention is composed of a cutting area at the left end and an assembly area at the right end, the assembly area is provided with a guide cone 24, a cylindrical pin 25, an arc transition surface 26, a locking surface 27 and a bottom surface 28, the cutting area is provided with a back 210, a cylindrical surface 211, an edge 212, an L-shaped double limiting surface, an inner edge 213 and a main edge 214, the cylindrical pin 25 is coaxial with the cylindrical surface 211, the bottom surface 28 is perpendicular to the central axis of the cylindrical pin 25, the locking surface 27 is arranged on the cylindrical pin 25, the side surface of the locking surface 27 is an inclined surface, the included angle between the side surface of the locking surface 27 and the central axis of the cylindrical pin 25 is 30-75 degrees, the bottom surface of the side surface of the locking surface 27 is arc-shaped, a transition edge 215 is formed between the main edge 214 and the inner edge 213, the main edge 214, the inner edge 213 and the transition edge 215 are arranged at the front end (left end) of the chip groove 29, the solid part of the chip groove 29 on the cutting area, the L-shaped double-limit surfaces are two groups, comprise a first L-shaped double-limit surface 216 and a second L-shaped double-limit surface 217, are convenient to bear large torque, are in one-to-one correspondence and adaptation with the L-shaped double-limit surfaces 9 on two sides of the drill rod 1 respectively, the first L-shaped double-limit surface 216 and the second L-shaped double-limit surface 217 are arranged in a non-centrosymmetric mode, the eccentricity 218 is 0.02-0.2mm, and the positioning is more reliable by adopting the locking surface 27 and the two groups of L-shaped double-limit surfaces to realize the limiting positioning.
The length of the guide cone 24 is 0.1-1mm, the taper is 30 degrees, the installation is convenient, and the guide effect is achieved.
The manufacturing process of the invention is as follows:
during manufacturing, the cylindrical pin 25, the guide cone 24, the arc transition surface 26 and the cylindrical surface 211 are ground to form the bottom surface 28, the cylindrical pin 25 and the cylindrical surface 211 are on the same axis, the locking surface 27 and the bottom surface 28 are ground by taking the cylindrical pin 25 as a reference, the locking surface 27 is an inclined surface and an arc, the inclined surface and the central axis of the cylindrical pin 25 form a 30-75 degree angle, and the bottom surface 28 is perpendicular to the central axis of the cylindrical pin 25.
And grinding the first L-shaped double limiting surface 216 to enable the first L-shaped double limiting surface 216 and the second L-shaped double limiting surface 217 on two sides of the cutting area to be non-centrosymmetric, so that the situation that the tool bit cannot be locked and fall off due to installation errors of the tool bit side pressure locking surface 27 is avoided, the chip groove 29 is ground, and the helical angle of the chip groove 29 is 0-35 degrees.
Grinding a main edge 214 and an inner edge 213, forming a transition edge 215 between the main edge 214 and the inner edge 213, wherein the length of the inner edge 213 is 1/4-1/2 of the length of the main edge 214, and the arc size of the transition edge 215 is R0.1-3 mm.
During assembly, the cylindrical pin of the crown cutter head 2 extends into the centering hole 10, and the compression screw 3 is screwed into the counter bore 17, the fastening threaded hole 16 and the centering hole 10 until the crown cutter head 2 is tightly fixed on the cutter bar 1.
The parts of the invention not specifically described can be realized by adopting the prior art or products, and are not described in detail herein.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. A round pin centering double-limit side pressure locking crown drill bit is characterized by comprising a drill rod, a crown bit and a compression screw which are matched, wherein the drill rod comprises a working part, a neck part and a handle part which are connected in sequence, the working part is provided with a spiral chip removal groove and a back of a knife, the solid part except the chip removal groove on the working part is the back of the knife, a main cooling hole is arranged inside the drill rod and penetrates through the neck part and the handle part, the main cooling hole is provided with two water outlet holes on the left end surface of the working part to form a Y-shaped structure, the left end inside the working part is provided with a centering hole, one side of the centering hole is provided with a fastening threaded hole and a counter bore, the fastening threaded hole is not overlapped with the central axis of the counter bore, two L-shaped limit surfaces are formed on two sides of the left end surface of the working part, a cylindrical pin of the crown bit extends into the centering hole and is locked on the, the L-shaped double limiting surfaces of the drill rod are attached to the double limiting surfaces of the crown cutter head.
2. The round pin centering double-limit side pressure locking crown drill according to claim 1, wherein the working portion, the neck portion and the shank portion are connected in sequence from left to right and are coaxial.
3. The round pin centering double-limit side pressure locking crown drill bit as claimed in claim 1, wherein the left end inside the working part is provided with a centering hole along the central axis, the eccentricity between the axis of the counter bore and the axis of the bottom fastening threaded hole is 0.02-0.1mm, and a compression screw generates friction force with the counter bore when being screwed into the fastening threaded hole so as to fasten the crown drill bit.
4. The round pin centering double-limit lateral pressure locking crown drill bit as claimed in claim 1, wherein the angle formed between the cylindrical pin locking surface of the crown bit and the central axis of the compression screw is 70-88 °.
5. The round pin centering double spacing side pressure locking crown drill bit according to claim 1, wherein said neck portion is provided with a transition groove for circular arc transition for reducing stress concentration.
6. The round pin centering double-limit side pressure locking crown drill bit as claimed in claim 1, wherein the shank is cylindrical, the top of the shank is transversely provided with a side pressure surface, and the right end surface of the shank is provided with a decontamination groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011127545.0A CN112157299A (en) | 2020-10-20 | 2020-10-20 | Round pin centering double-limit side pressure locking crown drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011127545.0A CN112157299A (en) | 2020-10-20 | 2020-10-20 | Round pin centering double-limit side pressure locking crown drill bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112157299A true CN112157299A (en) | 2021-01-01 |
Family
ID=73867751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011127545.0A Pending CN112157299A (en) | 2020-10-20 | 2020-10-20 | Round pin centering double-limit side pressure locking crown drill bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112157299A (en) |
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2020
- 2020-10-20 CN CN202011127545.0A patent/CN112157299A/en active Pending
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