CN214517779U - Novel cooling back-pull type tooth crown drill bit - Google Patents

Abstract

The utility model provides a novel draw formula crown drill bit behind cooling, it makes the crown drill bit accomplish the locking through draw formula structure and drilling rod after for locking is firm reliable, and makes the cutting edge of coolant liquid direct cooling crown drill bit, and the cooling effect is good. The drilling rod includes working portion, neck, stalk portion, the periphery of the working portion of drilling rod is provided with spiral chip groove and back of a knife blade, the front end central point of working portion puts the indent and forms tooth crown tool bit location chamber, tooth crown tool bit inlay and adorn in tooth crown tool bit location chamber, the tooth crown tool bit includes the locking screw hole of rear end indent, the front end screw thread of lag screw is connected to the locking screw hole of tooth crown tool bit, the axial inner in the tooth crown tool bit location chamber of working portion is provided with indent central thread hole, lag screw's rear end threaded connection indent central thread hole, lag screw's front end screw thread and rear end screw thread's are opposite soon, the axial direction of center position of drilling rod is provided with main cooling hole.

Description

Novel cooling back-pull type tooth crown drill bit

Technical Field

The utility model relates to a technical field of cutting tool structure specifically is a novel cooling back-pull type tooth crown drill bit.

Background

With the rapid development of industries such as engineering machinery, heat exchangers, wind power and the like, large-diameter holes are processed more and more, the whole hard alloy drill bit is expensive and high in processing 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 made of alloy steel materials. The method 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 a drill rod have multiple combination modes, the cooling mode is that a cooling hole sprays towards inclined planes on two sides, the cutting edge of the crown bit cannot be directly cooled, and the cooling effect is poor.

Disclosure of Invention

In view of the above problem, the utility model provides a novel cooling back-pull type tooth crown drill bit, it makes tooth crown drill bit accomplish the locking through back-pull type structure and drilling rod for locking is firm reliable, and makes the cutting edge of coolant liquid direct cooling tooth crown drill bit, and the cooling effect is good.

The utility model provides a novel draw formula crown drill bit behind cooling which characterized in that: the drilling rod comprises a drilling rod and a crown cutter head, the drilling rod comprises a working part, a neck part and a handle part, a spiral chip groove and a cutter back are arranged on the periphery of the working part of the drilling rod, the front end central position of the working part is concave to form a crown cutter head positioning cavity, the crown cutter head is embedded in the crown cutter head positioning cavity, the crown cutter head comprises a locking threaded hole concave at the rear end, the locking threaded hole of the crown cutter head is connected with the front end thread of a tensioning screw, the axial inner end of the crown cutter head positioning cavity of the working part is provided with a concave central threaded hole, the rear end thread of the tensioning screw is connected with the concave central threaded hole, the front end thread and the rear end thread of the tensioning screw are opposite in rotation direction, the axial central position of the drilling rod is provided with a main cooling hole, the concave central threaded hole is communicated with the main cooling hole, and the periphery of the front end of the main cooling hole, which faces the working part, is provided with at least two bypass pipelines, two liquid outlets are formed in the positions, facing the end stop surface of the tooth crown cutter head positioning cavity, of the main cooling hole, liquid outlet notches are formed in the positions, corresponding to the liquid outlets, of the tooth crown cutter head, and the rear end surface of the tooth crown cutter head and the end stop surface plane of the tooth crown cutter head positioning cavity are arranged in a close fit mode in an assembled state; and the crown cutter head and the working part of the drill rod are assembled in place to form an integral drill bit structure.

It is further characterized in that:

the obtuse angle positioning surfaces on the two sides of the crown cutter head are of symmetrical structures;

the section of the spiral chip groove is of a U-shaped groove structure, a protection cutter edge is arranged in the spiral chip groove, the chip containing space is large due to the groove body structure of the U-shaped groove, chip removal is smooth, the strength of a cutter back is high, the feeding speed is high during processing, the front angle of the groove of the outer diameter part is reduced by the protection cutter edge, and cutter breakage caused by the fact that a drill rod under severe working conditions participates in cutting is prevented;

two bypass pipelines are arranged on the periphery of the front end of the main cooling hole facing the working part to form a Y-shaped passage outlet, and the Y-shaped passage outlet is communicated to the liquid outlet through a branch;

the handle part of the drill rod is provided with a side pressure surface inclined by 2 degrees and is locked by a side pressure locking screw of the tool holder, and the handle part is clamped by the tool holder to transmit the power of the machine tool when the drill rod is used, so that the tool rotates and has cutting capacity;

the neck is the assembly of cone and cylinder, and in operation, it can avoid the smear metal to splash and strike handle of a knife and lathe main shaft, plays the guard action.

Adopt the utility model discloses afterwards, the locking screw hole of crown tool bit connects at least part of tightening screw's front end screw thread, during the pre-installation, leave certain front end screw thread and twist and move the installation clearance, later with crown tool bit location chamber, tightening screw's rear end threaded connection indent central screw hole, interior hexagonal spanner twists and moves tightening screw after running through main cooling hole, make tightening screw's rear end threaded connection indent central screw hole, make simultaneously the rear end face of crown tool bit and the tip backstop face plane in crown tool bit location chamber hug closely and arrange, accomplish taut lock and attach, it makes the crown drill bit accomplish the locking through pull-back structure and drilling rod, make locking firm and reliable, coolant liquid communicates to the liquid outlet through main cooling hole in addition, go out the liquid breach, make the direct cooling of coolant liquid crown drill bit cutting edge, the cooling effect is good.

Drawings

FIG. 1 is a schematic view of the structure of the present invention;

fig. 2 is a schematic diagram (partially cut away) of the structure of the explosion diagram of the present invention;

FIG. 3 is a left side view schematic of the structure of FIG. 1;

FIG. 4 is a schematic view of section A-A of FIG. 2;

FIG. 5 is a schematic view of section B-B of FIG. 2;

the names corresponding to the sequence numbers in the figure are as follows:

the drill rod comprises a drill rod 1, a working part 11, a neck part 12, a handle part 13, a spiral chip groove 14, a cutter back 15, a tooth crown cutter head positioning cavity 16, an inwards concave central threaded hole 17, a protective cutter edge 18, a side pressing surface 19, a tooth crown cutter head 2, a locking threaded hole 21, an obtuse angle positioning surface 22, a tensioning screw 3, a front end thread 31, a rear end thread 32, a main cooling hole 4, a bypass pipeline 5, a liquid outlet 6, a liquid outlet notch 7 and a branch 8.

Detailed Description

A novel cooling back-pull type tooth crown drill bit is shown in figures 1-5: the drill rod comprises a drill rod 1 and a 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 cutter back 15 are arranged on the periphery of the working part 11 of the drill rod 1, a crown bit positioning cavity 16 is formed by recessing the front end center position of the working part 11, the crown bit 2 is embedded in the crown bit positioning cavity 16, the crown bit 2 comprises a locking threaded hole 21 with a recessing back end, the locking threaded hole 21 of the crown bit 21 is connected with a front end thread 31 of a tensioning screw 3, the axial inner end of the crown bit positioning cavity 16 of the working part 11 is provided with a recessing center threaded hole 17, a back end thread 32 of the tensioning screw 3 is connected with the recessing center threaded hole 17, the turning directions of the front end thread 31 and the back end thread 32 of the tensioning screw 3 are opposite, a main cooling hole 4 is arranged on the axial center position of the drill rod 1, the recessing 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, two liquid outlets 6 are arranged at the positions of the main cooling hole 4 facing the end stop surface of the tooth crown cutter head positioning cavity 16, liquid outlet notches 7 are arranged at the positions of the tooth crown cutter head 2 corresponding to the liquid outlets 6, and the rear end surface of the tooth crown cutter head 2 and the end stop surface plane of the tooth crown cutter head positioning cavity 16 are arranged in a clinging manner in an assembled state; the crown bit 2 and the working portion 11 of the drill rod 1 are assembled in place to form an integral drill bit structure.

The obtuse angle positioning surfaces 22 on the two sides of the crown bit 2 are of a symmetrical structure, and the angulation of the obtuse angle positioning surfaces 22 is specifically 120-150 degrees.

In specific implementation, the front end thread 31 of the tightening screw 3 is specifically a right-hand thread, and the rear end thread 32 is specifically a left-hand thread.

The section of the spiral chip groove 14 is of a U-shaped groove structure, the protection tool edge 18 is arranged in the spiral chip groove 14, the groove body structure of the U-shaped groove enables chip containing space to be large, chip removal is smooth, meanwhile, the strength of a tool back is high, the feeding speed during machining is high, the protection tool edge 18 reduces the front angle of the groove at the outer diameter part, and the problem that a drill rod under severe working conditions participates in cutting to cause tool breakage is avoided;

the periphery of the front end of the main cooling hole 4 facing the working portion 11 is provided with two bypass pipelines 5 to form a Y-shaped passage outlet, the Y-shaped passage outlet is communicated to the liquid outlet 6 through a branch 8 respectively, the crown bit 2 is supplied with cooling liquid during working, the cooling liquid of the main cooling hole 4 is sprayed out from the liquid outlet of the front end face through two times of switching, and the cutting edge of the crown bit 2 is directly sprayed.

The handle part 13 of the drill rod 1 is provided with a side pressure surface 19 inclined by 2 degrees, the locking screw is locked through the side pressure of the tool holder, and when the drill rod is used, the handle part is clamped by the tool holder to transmit the power of a machine tool, so that the tool rotates and has cutting capacity;

the neck 12 is a cone and cylinder combination which, in operation, prevents chips from splashing and impacting the shank and the spindle of the machine tool, thus protecting the shank and the spindle.

The working principle is as follows: the locking screw hole of crown bit connects at least part of the front end screw thread of straining screw, when preassembling, leave certain front end screw thread and twist and move the installation clearance, later with crown bit location chamber, the rear end threaded connection indent central thread hole of straining screw, screw and move straining screw after hexagon socket wrench runs through main cooling hole, make the rear end threaded connection indent central thread hole of straining screw, make the rear end face of crown bit and the tip backstop face plane in crown bit location chamber hug closely the arrangement simultaneously, accomplish taut lock and attach, it makes the crown bit accomplish the locking through pull-back structure and drilling rod, make locking firm and reliable, in addition the coolant liquid communicates to the liquid outlet through main cooling hole, go out the liquid breach, make the cutting edge of the crown bit of direct cooling of coolant liquid, the cooling effect is good.

The back-pull type crown drill bit adopts central back-pull type locking, has large tension force and reliable installation, and cannot be loosened in the processing process; the central back-pull locking screw adopts a left-right rotation design, is convenient to install and cannot be loosened in the machining process; the left-handed tightening thread at the center of the drill rod is high in matching precision with the locking screw, and the cooling effect is influenced by effectively preventing the cooling liquid from leaking from the center; the positioning surfaces on the two sides of the drill rod are designed in an obtuse angle, and the angle of 100-154 degrees is favorable for the large area of the support part of the drill rod and the high support strength; the drill rod is made of high-strength alloy steel, so that the drill rod is high in strength, good in wear resistance, good in shock resistance and long in service life.

The beneficial effects are as follows: the cutting tool is optimized on the basis of a Y-shaped inner cooling structure, and the cutting tool is directly cooled by the cooling liquid, so that the cutting tool has a good cooling effect on heat generated during machining; meanwhile, as the diameters of the cooling holes are different, the cooling pressure can be further improved as the large flow flows into the small flow and flows out; the chip removal groove type adopts a U-shaped design, the cutter bar has good rigidity, can bear large-feed processing and is not easy to break, and the U-shaped groove is provided with a protective cutter edge design, so that the breakage of the drill bar caused by the participation of a front cutter face of the drill bar in cutting and extrusion is effectively prevented; the front end of the drill rod is provided with a supporting surface, so that an effective supporting effect is achieved during drilling and machining, and drilling is stable; the drill stem part is inclined by 2 degrees of side pressure surface, and after the drill stem is installed and locked, the drill bit is prevented from generating axial displacement and loosening in the machining process.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. 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 description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (6)

1. The utility model provides a novel draw formula crown drill bit behind cooling which characterized in that: the drilling rod comprises a drilling rod and a crown cutter head, the drilling rod comprises a working part, a neck part and a handle part, a spiral chip groove and a cutter back are arranged on the periphery of the working part of the drilling rod, the front end central position of the working part is concave to form a crown cutter head positioning cavity, the crown cutter head is embedded in the crown cutter head positioning cavity, the crown cutter head comprises a locking threaded hole concave at the rear end, the locking threaded hole of the crown cutter head is connected with the front end thread of a tensioning screw, the axial inner end of the crown cutter head positioning cavity of the working part is provided with a concave central threaded hole, the rear end thread of the tensioning screw is connected with the concave central threaded hole, the front end thread and the rear end thread of the tensioning screw are opposite in rotation direction, the axial central position of the drilling rod is provided with a main cooling hole, the concave central threaded hole is communicated with the main cooling hole, and the periphery of the front end of the main cooling hole, which faces the working part, is provided with at least two bypass pipelines, two liquid outlets are formed in the positions, facing the end stop surface of the tooth crown cutter head positioning cavity, of the main cooling hole, liquid outlet notches are formed in the positions, corresponding to the liquid outlets, of the tooth crown cutter head, and the rear end surface of the tooth crown cutter head and the end stop surface plane of the tooth crown cutter head positioning cavity are arranged in a close fit mode in an assembled state; and the crown cutter head and the working part of the drill rod are assembled in place to form an integral drill bit structure.

2. The novel cooled back pull crown bit according to claim 1, wherein: the obtuse angle positioning surfaces on the two sides of the crown bit are of symmetrical structures.

3. The novel cooled back pull crown bit according to claim 1, wherein: the section of the spiral chip groove is of a U-shaped groove structure, and a protection knife edge is arranged in the spiral chip groove.

4. The novel cooled back pull crown bit according to claim 1, wherein: two bypass pipelines are arranged on the periphery of the front end of the main cooling hole facing the working portion to form a Y-shaped passage outlet, and the Y-shaped passage outlet is communicated to the liquid outlet through a branch.

5. The novel cooled back pull crown bit according to claim 1, wherein: the handle of the drill rod is provided with a side pressure surface inclined by 2 degrees.

6. The novel cooled back pull crown bit according to claim 1, wherein: the neck is a combination of a cone and a cylinder.

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