CN111590118A

CN111590118A - Centering deep hole drill

Info

Publication number: CN111590118A
Application number: CN202010502387.6A
Authority: CN
Inventors: 于衍
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-06-05
Filing date: 2020-06-05
Publication date: 2020-08-28

Abstract

A centering deep hole drill comprises a drill bit main body, wherein the upper part of the drill bit main body is provided with a first blade fixing frame seat and a second blade fixing frame seat, and the lower part of the drill bit main body is provided with a drill bit main body fixing handle; the centering head is fixed with the drill bit main part, and first blade mount is fixed on first blade mount seat and is established first drilling blade group between upper portion, and second blade mount is fixed on second blade mount seat and is established second drilling blade group, characteristics between upper portion: the adjusting screw is connected with the end face of the right end of the first blade fixing frame or connected with the end face of the left end of the second blade fixing frame; the drill bit main body is also provided with a first blade cooling liquid guiding groove and a second blade cooling liquid guiding groove, the upper end of the first blade cooling liquid guiding groove corresponds to the lower part of the first drilling blade group, the lower end of the first blade cooling liquid guiding groove is communicated with the upper end of the drill bit main body cooling liquid leading-out hole, the upper end of the second blade cooling liquid guiding groove corresponds to the lower part of the second drilling blade group, and the lower end of the second blade cooling liquid guiding groove is communicated with the upper end of the drill bit main body cooling liquid leading-out. The cooling effect on the blade is improved; the chip discharging effect is good.

Description

Centering deep hole drill

Technical Field

The invention belongs to the technical field of metal processing tools, and particularly relates to a centering deep hole drill.

Background

As is known in the art, hole machining is classified into shallow hole machining and deep hole machining, and specifically, L/d < 5mm, i.e., the ratio of the hole depth to the hole diameter is less than 5mm, is called a shallow hole, the range of L/d greater than 5mm and less than 100mm is called a deep hole, and the range of L/d greater than 100mm is called an ultra-deep hole. Deep hole drilling plays a very important role in the field of machining, and accounts for about 40% of hole machining amount. With the technological progress, novel high-strength, high-hardness and high-added-value deep-hole parts difficult to machine are increased correspondingly, and the requirements on the machining depth, the machining precision and the machining efficiency of a workpiece hole are also improved continuously, so that the deep-hole machining becomes a key process and a machining difficulty of mechanical machining, and even the requirements are more and more difficult to meet.

Considering that workers want to benefit their tools first, as deep hole drills, the chip removal effect of drilling, the cooling effect during drilling, the drilling efficiency, etc. are all very important factors.

Technical information relating to deep hole drills such as CN109482941A (a high precision twist drill), CN110023013A (a bur and replaceable head for twist drill), CN209006743U (a bottom wear twist drill), CN209754102U (positionable U drill), CN110605426A (a high precision U drill) and CN102672246A (U drill for drilling multi-layer boards), etc. can be seen in the published chinese patent documents. While not limited to the foregoing patents, each has unique strengths, there are two general disadvantages: firstly, because the cooling mode of the cooling liquid to the blade part of the cutter head adopts an outside-in cooling mode, the cooling liquid is led to the end face of the tail end of the drill bit through a channel or a pore passage arranged on the drill bit and overflows from the channel or the pore passage, namely the overflowing cooling liquid cools the blade, and because the cooling mode has relatively poor integral cooling effect on the blade, the cooling mode has great influence on the service life of the blade; secondly, since the position of the blade seat (also called as a "blade fixing clip" or "blade fixing frame") as a blade carrier for mounting the blade is not adjustable on the drill bit body, the drill bit with the corresponding specification must be replaced as long as the drilled hole diameter is changed, thereby increasing the cost of a drilling tool used by a machining unit on one hand, causing troubles to the management of the tool on the other hand, and being not beneficial to saving drill bit resources with severe requirements on materials on the other hand.

Disclosure of Invention

The object of the invention is to provide a centering deep hole drill which facilitates cooling of the cutting insert from the inside to the outside by a coolant, significantly improves the cooling effect on the cutting insert, and facilitates the extension of the service life of the cutting insert, facilitates the adaptive adjustment of the cutting insert holder in accordance with the change in the hole diameter to be drilled, thereby saving the cost of the drill equipment in the machining unit, facilitates the management of the drill tools, and facilitates the saving of the drill material resources which are critical to the material.

The invention aims to solve the problems that a centering deep hole drill comprises a drill bit main body, wherein a first blade fixing frame seat I and a second blade fixing frame seat II are formed at the upper part of the drill bit main body, a drill bit main body fixing handle extends from the lower part of the drill bit main body, a drill bit main body cooling liquid leading-out hole is formed in the center of the drill bit main body fixing handle, a centering head mounting hole is formed in the upper part of the drill bit main body and corresponds to the position between the first blade fixing frame seat I and the second blade fixing frame seat II, and the bottom of the centering head mounting hole corresponds to the drill bit main body cooling liquid leading-out hole; the drill bit comprises a drill bit main body, a centering head, a first blade fixing frame I and a second blade fixing frame II, wherein the centering head is fixed with the drill bit main body at a position corresponding to a centering head mounting hole; the drill bit main body is further provided with a first blade cooling liquid guiding groove I and a second blade cooling liquid guiding groove II, the upper end of the first blade cooling liquid guiding groove I corresponds to the lower part of the first drilling blade group I, the lower end of the first blade cooling liquid guiding groove I is communicated with the upper end of the drill bit main body cooling liquid leading-out hole, the upper end of the second blade cooling liquid guiding groove II corresponds to the lower part of the second drilling blade group II, and the lower end of the second blade cooling liquid guiding groove II is also communicated with the upper end of the drill bit main body cooling liquid leading-out hole.

In a specific embodiment of the present invention, the first insert holder block i is located at the left side of the upper portion of the bit body, and the second insert holder block ii is located at the right side of the upper portion of the bit body; a first supporting step I is formed on the first blade fixing frame seat I and at a position corresponding to the first blade fixing frame I, and a second supporting step II is formed on the second blade fixing frame seat II and at a position corresponding to the second blade fixing frame II; the first blade fixing frame I is fixed with the first blade fixing frame seat I in a state of being supported on the first supporting step I, and the second blade fixing frame II is fixed with the second blade fixing frame seat II in a state of being supported on the second supporting step II; the upper parts of the first drilling blades I respectively form a first drilling blade edge I, the first drilling blade edge I extends out of the upper plane of the first blade fixing frame seat I, the upper parts of the second drilling blades II respectively form a second drilling blade edge II, and the second drilling blade edge II extends out of the upper plane of the second blade fixing frame seat II; the upper end of the first blade cooling liquid guiding groove I extends to the first supporting step I, and the upper end of the second blade cooling liquid guiding groove extends to the second supporting step II; when the blade fixing frame adjusting screw is in threaded connection with the right end face of the first blade fixing frame I, the right end of the blade fixing frame adjusting screw is supported on the right side wall of the first supporting step I, and when the blade fixing frame adjusting screw is in threaded connection with the left end face of the second blade fixing frame II, the left end of the blade fixing frame adjusting screw is supported on the left side wall of the second supporting step II.

In another specific embodiment of the present invention, a first blade fixing frame seat screw hole i is formed on the first blade fixing frame seat i, and a first blade fixing frame seat screw i is disposed at a position corresponding to the first blade fixing frame seat screw hole i, and the first blade fixing frame seat screw i is fixed to the rear side of the first blade fixing frame i; and a second blade fixing frame seat screw hole II is formed in the second blade fixing frame seat II, a second blade fixing frame seat screw II is arranged at a position corresponding to the second blade fixing frame seat screw hole II in a matching manner, and the second blade fixing frame seat screw II is fixed with the front side of the second blade fixing frame II.

In a further specific embodiment of the present invention, a first blade holder screw hole is formed at a rear side of the first blade holder i and at a position corresponding to a first blade holder base screw i, into which the first blade holder base screw i is screwed; and a second blade fixing frame screw hole is formed in the front side of the second blade fixing frame II and in a position corresponding to the second blade fixing frame seat screw II, and the second blade fixing frame seat screw II is screwed into the second blade fixing frame screw hole.

In a further embodiment of the present invention, a centering head locking screw hole communicating with the centering head mounting hole is formed in the drill main body, a centering head locking screw is provided in the centering head locking screw hole, the lower end of the centering head is locked to the drill main body at a position corresponding to the centering head mounting hole by the centering head locking screw, and the upper end of the centering head protrudes from the upper surface of the drill main body.

In yet another embodiment of the present invention, when the blade holder adjusting screw is screwed to the right end face of the first blade holder i, a first blade holder adjusting screw hole is formed in the right end face of the first blade holder i, and when the blade holder adjusting screw is screwed to the left end face of the second blade holder ii, a second blade holder adjusting screw hole is formed in the left end face of the second blade holder ii.

In a more specific embodiment of the present invention, the first drill inserts of the first set are each fixed to the front side of the first insert holder i by an insert first screw i at a position corresponding to a first insert fixing screw hole i provided in the first insert holder i, and the second drill inserts of the second set are each fixed to the rear side of the second insert holder ii by an insert second screw ii at a position corresponding to a second insert fixing screw hole ii provided in the second insert holder ii; the first drilling inserts I and the second drilling inserts II are arranged at intervals of 180 degrees around the circumferential direction of the drill body 1, and the first drilling inserts I and the second drilling inserts II are arranged on the same straight line corresponding to the left and the right.

In a further embodiment of the invention, the set of first drill inserts i and the set of second drill inserts ii are triangular in shape.

In a still more specific embodiment of the present invention, a pair of centering head coolant through holes penetrating from an upper end surface to a lower end surface of the centering head are formed in the centering head, and the pair of centering head coolant through holes communicate with the drill body coolant outlet hole.

In yet another specific embodiment of the present invention, a fixed shank locking hole is formed in the fixed shank of the drill main body; the lower surface of the drill bit main body is provided with a pair of drill bit main body connecting rod claw matching cavities, and the drill bit main body connecting rod claw matching cavities are separated by 180 degrees around the circumferential direction of the drill bit main body; a drill body connecting rod is arranged at a position corresponding to the drill body connecting rod claw matching cavity, a connecting rod cooling liquid through hole is arranged at the central position of the drill body connecting rod in the height direction, the connecting rod cooling liquid through hole corresponds to and is communicated with the drill body cooling liquid leading-out hole, a fixed handle matching cavity is formed at the central position of one end, facing the drill body fixing handle, of the drill body connecting rod, a fixing handle locking screw hole is arranged at a position corresponding to the cavity wall of the fixed handle matching cavity, a fixing handle locking screw is arranged at the position of the fixing handle locking screw hole, a pair of connecting rod claws is formed at one end, facing the drill body, of the drill body connecting rod and at a position corresponding to the drill body connecting rod claw matching cavity, and the drill body fixing handle is inserted and matched with the fixing handle matching cavity, the fixed handle locking screw extends into the fixed plate locking hole, and the pair of connecting rod claws is matched with the pair of drill bit main body connecting rod claw matching cavities; a connecting rod adapter with the outer diameter smaller than that of the drill bit main body connecting rod extends from one end of the drill bit main body connecting rod away from the drill bit main body, a pair of clamping rod locking holes are formed on the outer wall of the connecting rod fitting, a clamping rod is arranged at the position corresponding to the connecting rod fitting, one end of the clamping rod facing the connecting rod adapter is provided with a connecting rod adapter sleeve, the wall body of the connecting rod adapter sleeve is provided with a pair of clamping rod locking screw holes communicated with an adapter sleeve cavity of the connecting rod adapter sleeve and a cooling liquid introduction interface hole, a clamping rod locking screw is respectively arranged on the pair of clamping rod locking screw holes, the connecting rod fitting is inserted into the fitting head sleeve cavity, the pair of clamping rod locking screws are screwed into the pair of clamping rod locking holes, and the cooling liquid introduction interface hole is communicated with the connecting rod cooling liquid through hole through the matching joint sleeve cavity; one end of the clamping rod, which is far away from the matching head sleeve of the connecting rod, is provided with a clamping rod fixing head.

One of the technical effects of the technical scheme provided by the invention is that as the drill bit main body is respectively provided with the first blade cooling liquid guiding groove I and the second blade cooling liquid guiding groove II, the cooling liquid led out from the drill bit main body cooling liquid leading-out hole is led to the lower part of the first drilling blade I and the lower part of the second drilling blade II from the first blade cooling liquid guiding groove I and the second blade cooling liquid guiding groove II, and the cooling liquid has the cooling effect from inside to outside on the first drilling blade I and the second drilling blade II, so that the cooling effect on the blades can be obviously improved, and the service life of the blades can be obviously prolonged; secondly, the cooling of the group of first drilling blades I and the group of second drilling blades II is realized by cooling the cooling liquid flowing from inside to outside, so that the drilling cuttings generated in the drilling process can be taken out simultaneously when the cooling liquid is sprayed out, and a good chip discharging effect is realized; thirdly, because the adjusting screw of the blade fixing frame is additionally arranged, the adjusting screw of the blade fixing frame can be adaptively adjusted according to the drilling aperture change of the workpiece, so that the position of the first blade fixing frame I or the second blade fixing frame II is changed to meet the requirement of the aperture consistent with the aperture of the drilled workpiece hole, the equipment cost of a drilling tool of a metalworking enterprise can be saved, the management of a drill bit tool can be facilitated, and the material resource of the drill bit with strict requirement on the material can be saved.

Drawings

FIG. 1 is a block diagram of an embodiment of the present invention.

Fig. 2 is a schematic front side view of fig. 1.

Fig. 3 is a rear side view of fig. 1.

FIG. 4 is a schematic view of the configuration of FIG. 1 with a drill body connecting rod and a clamping rod.

Detailed Description

In order to clearly understand the technical spirit and the advantages of the present invention, the applicant below describes in detail by way of example, but the description of the example is not intended to limit the technical scope of the present invention, and any equivalent changes made according to the present inventive concept, which are merely in form and not in material, should be considered as the technical scope of the present invention.

In the following description, unless otherwise specified, all the concepts related to the directions or orientations of up, down, left, right, front and rear are based on the position state of fig. 1, and thus, should not be construed as particularly limiting the technical solution provided by the present invention.

Referring to fig. 1 to 3, there is shown a drill body 1, a first insert holder block i 11 and a second insert holder block ii 12 are formed at an upper portion of the drill body 1, a drill body fixing shank 13 extends at a lower portion of the drill body 1, a drill body cooling fluid outlet hole 131 is formed at a central position of the drill body fixing shank 13, a centering head mounting hole 14 is formed at an upper portion of the drill body 1 at a position corresponding to a position between the first insert holder block i 11 and the second insert holder block ii 12, and a bottom of the centering head mounting hole 14 corresponds to the drill body cooling fluid outlet hole 131; a centering head 2 is shown, the centering head 2 is fixed with the drill main body 1 at a position corresponding to a centering head mounting hole 14, a first blade holder I3 and a second blade holder II 4 are shown, the first blade holder I3 is fixed on the first blade holder base I11, a group of first drilling blades I31 is fixed on the upper portion of the front side surface of the first blade holder I3 at intervals, the second blade holder II 4 is fixed on the second blade holder base II 12, and a group of second drilling blades II 41 is fixed on the upper portion of the rear side surface of the second blade holder II 4 at intervals.

As the technical point of the technical scheme provided by the invention, the structure system of the centering deep hole drill further comprises a blade fixing frame adjusting screw 5, and in the embodiment, the blade fixing frame adjusting screw 5 is in threaded connection with the left end face of the second blade fixing frame II 4; a first blade cooling liquid guiding groove I15 and a second blade cooling liquid guiding groove II 16 are further formed on the drill main body 1, the upper end of the first blade cooling liquid guiding groove I15 corresponds to the lower part of the first drilling blade group I31, more specifically to the lower part of the first drilling blade I positioned in the middle position in the first drilling blade group I31, and the lower end of the first insert cooling liquid guiding groove I15 communicates with the upper end of the drill body cooling liquid lead-out hole 131 in a downwardly inclined state, and the upper end of the second insert cooling liquid guiding groove II 16 corresponds to the lower side of the aforementioned set of second drill inserts II 41, more specifically to the lower side of the second drill insert II located at the center among the set of second drill inserts II 41, and the lower end of the second insert coolant guiding groove ii 16 is also communicated with the upper end of the aforementioned bit body coolant lead-out hole 131 in a downwardly inclined state.

Continuing to refer to fig. 1 to 3, the first blade holder base i 11 is located on the left side of the upper portion of the drill body 1, and the second blade holder base ii 12 is located on the right side of the upper portion of the drill body 1; a first supporting step I17 a is formed on the first blade holder seat I11 at a position corresponding to the first blade holder I3, and a second supporting step II 17b (shown in FIG. 3) is formed on the second blade holder seat II 12 at a position corresponding to the second blade holder II 4; the first blade fixing frame I3 is fixed with a first blade fixing frame seat I11 under the state of being supported on the first supporting step I17 a, and the second blade fixing frame II 4 is fixed with a second blade fixing frame seat II 12 under the state of being supported on the second supporting step II 17 b; a first drill tip i 311 is formed at an upper portion of each of the first drill tips i 31, and the first drill tip i 311 protrudes out of an upper plane of the first tip holder base i 11, and a second drill tip ii 411 is formed at an upper portion of each of the second drill tips ii 41, and the second drill tip ii 411 protrudes out of an upper plane of the second tip holder base ii 12; the upper end of the first blade coolant guiding groove i 15 extends to the first supporting step i 17a, and the upper end of the second blade coolant guiding groove 16 extends to the second supporting step ii 17 b.

In the present embodiment, the blade holder adjustment screw 5 is screwed to the left end surface of the second blade holder ii 4, and therefore the left end of the blade holder adjustment screw 5 is supported by the left side wall 17d of the second support step ii 17 b.

According to the third principle, if the aforementioned blade holder adjusting screw 5 is screwed to the right end face of the aforementioned first blade holder i 3, the right end of the blade holder adjusting screw 5 is supported on the right side wall 17c of the first supporting step i 17 a.

Please refer to fig. 1, a first blade fixing frame seat screw hole i 111 is formed in the first blade fixing frame seat i 11, a first blade fixing frame seat screw i 1111 is disposed at a position corresponding to the first blade fixing frame seat screw hole i 111, and the first blade fixing frame seat screw i 1111 is fixed to the rear side of the first blade fixing frame i 3; a second blade holder seat screw hole ii 121 is formed in the second blade holder seat ii 12, a second blade holder seat screw ii 1211 is formed at a position corresponding to the second blade holder seat screw hole ii 121, and the second blade holder seat screw ii 1211 is fixed to the front side of the second blade holder ii 4.

A first blade fixing frame screw hole (not shown in the figure) is formed in the rear side of the first blade fixing frame I3 and at a position corresponding to the first blade fixing frame seat screw I1111, and the first blade fixing frame seat screw I1111 is screwed into the first blade fixing frame screw hole; a second insert holder screw hole 42 is provided in a position corresponding to the second insert holder base screw ii 1211 on the front side of the second insert holder ii 4, and the second insert holder base screw ii 1211 is screwed into the second insert holder screw hole 42.

A centering head locking screw hole 18 communicating with the centering head mounting hole 14 is formed in the drill main body 1, a centering head locking screw 181 is provided in the centering head locking screw hole 18, the lower end of the centering head 2 is locked to the drill main body 1 at a position corresponding to the centering head mounting hole 14 by the centering head locking screw 181, and the upper end of the centering head 2 protrudes from the upper surface of the drill main body 1.

In the present embodiment, the insert holder adjusting screw 5 is screwed to the left end surface of the second insert holder ii 4, and thus the second insert holder adjusting screw hole 43 is formed in the left end surface of the second insert holder ii 4. As mentioned above, if the blade holder adjusting screw 5 is threadedly connected to the right end face of the first blade holder I3, a first blade holder adjusting screw hole is formed in the right end face of the first blade holder I3. It will be appreciated that the present invention is not limited to the change in position of the insert holder adjustment screw 5.

Continuing to focus on fig. 1, the aforementioned first drill inserts i 31 are each fixed to the front side of the first insert holder i 3 by an insert first screw i 312 at a position corresponding to the first insert fixing screw hole i 32 provided in the aforementioned first insert holder i 3, and the aforementioned second drill inserts ii 41 are each fixed to the rear side of the second insert holder ii 4 by an insert second screw ii 412 at a position corresponding to the second insert fixing screw hole ii 44 provided in the aforementioned second insert holder ii 4; the aforementioned set of first drill tip i 31 and the set of second drill tip ii 41 are spaced 180 ° apart from each other around the circumferential direction of the aforementioned drill body 1, and the set of first drill tip i 31 and the set of second drill tip ii 41 are on the same straight line corresponding left and right.

As shown in fig. 1, the set of first drill inserts i 31 and the set of second drill inserts ii 41 are substantially triangular in shape.

A pair of centering head coolant through holes 21 penetrating from the upper end surface to the lower end surface of the centering head 2 are formed in the centering head 2, and the pair of centering head coolant through holes 21 communicate with the drill body coolant lead-out hole 131.

Referring to fig. 4 in conjunction with fig. 1-3, the bit body is turned 180 ° in fig. 4 relative to fig. 1-3. A fixed shank locking hole 132 is formed in the drill body fixed shank 13; a pair of drill bit body connecting rod claw matching cavities 19 are formed in the lower surface of the drill bit body 1, and the drill bit body connecting rod claw matching cavities 19 are separated by 180 degrees around the circumferential direction of the drill bit body 1; a bit body connecting rod 6 is provided at a position corresponding to the bit body connecting rod claw fitting cavity 19, a rod coolant through hole 61 is formed at a central position in the height direction of the bit body connecting rod 6, the rod coolant through hole 61 corresponds to and communicates with the bit body coolant lead-out hole 131, a shank fixing cavity 62 is formed at a central position of an end of the bit body connecting rod 6 facing the bit body fixing shank 13, a shank fixing screw hole 63 is formed at a position corresponding to the cavity wall of the shank fixing cavity 62, a shank fixing screw 631 is provided at a position of the shank fixing screw hole 63, a pair of connecting rod claws 64 is formed at an end of the bit body connecting rod 6 facing the bit body 1 (lower end in the position state shown in fig. 4) and at a position corresponding to the bit body connecting rod claw fitting cavity 19, the bit body fixing shank 13 is fitted into the fixing shank fitting cavity 62, the fixing shank locking screw 631 penetrates into the fixing plate locking hole 132, and the pair of coupling claws 64 are fitted into the pair of bit body coupling claw fitting cavities 19.

A connecting rod fitting 65 having an outer diameter smaller than that of the bit body connecting rod 6 extends from an end of the bit body connecting rod 6 remote from the bit body 1, a pair of clamping rod locking holes 651 are formed in an outer wall of the connecting rod fitting 65, a clamping rod 7 is provided at a position corresponding to the connecting rod fitting 65, a connecting rod fitting sleeve 71 is formed at an end of the clamping rod 7 facing the connecting rod fitting 65, a pair of clamping rod locking screw holes 712 communicating with a fitting sleeve cavity 711 of the connecting rod fitting sleeve 71 and a coolant introduction port hole 713 are provided in a wall of the connecting rod fitting sleeve 71, a clamping rod locking screw 7121 is provided in each of the pair of clamping rod locking screw holes 712, the connecting rod fitting 65 is inserted into the fitting sleeve cavity 711, and the pair of clamping rod locking screws 7121 are screwed into the pair of clamping rod locking holes 651, the coolant introduction port 713 is communicated with the connecting rod coolant passage 61 through the mating head housing 711; a clamping bar fixing head 72 is formed at the end of the clamping bar 7 remote from the connecting bar fitting sleeve 71 (i.e., the upper end as viewed in fig. 4).

The present invention can be clamped to metal working equipment such as milling machines, drilling machines and boring machines in the arrangement shown in fig. 4, but the drilling machine has a relatively high probability of use and can be used either in the state shown in fig. 4 or in a horizontal state after being changed by 90 ° with respect to fig. 4 according to actual use requirements. When the drill bit is used, namely the clamping rod 7 is driven by the drilling machine to move and the drill bit main body connecting rod 6 is driven by the clamping rod 7 to work together with the drill bit main body 1 to be in a deep hole drilling state, a rotary joint is connected to the coolant inlet port 713, the rotary joint is connected to a pipeline having coolant conveying pressure, coolant such as emulsion or water is introduced into the joint sleeve chamber 711 through the rotary joint via the pipeline, then sequentially passes through the connecting rod coolant through hole 61 and the drill body coolant outlet hole 131, and is further divided into three paths, one path, namely a first path, is introduced to a set of first drill blades i 31 in a working state (i.e., a drilling state) via the first blade coolant guide groove i 15, the other path, namely a second path, is introduced to a set of second drill blades ii 41 in the working state (i.e., the drilling state) via the second blade coolant guide groove ii 16, and the other path, namely a third path, is introduced into a pair of centering head coolant through holes 21 to be sprayed. The applicant showed the excellent cooling effect described in the above technical effect column.

According to the position state shown in fig. 1, if the diameter of the drilled hole is increased relative to the original drilled diameter, taking the adjustment of the second insert holder ii 4 as an example, first, a pair of second insert holder base screws ii 1211 adjustable within the adjustable range of the length direction of a pair of second insert holder base screw holes ii 121 having an oval shape is loosened, the second insert holder ii 4 is adjusted (moved) to the right, specifically, the insert holder adjusting screws 5 are operated to withdraw the insert holder adjusting screws 5 from the second insert holder adjusting screw holes 43 by a certain distance as required, so as to force the second insert holder ii 4 to move to the right, and then the second insert holder base screws ii 1211 is tightened, or vice versa. If the blade holder adjusting screw 5 is arranged at the first blade holder I3, the adjusting principle is the same as that described above, and repeated description is omitted.

In conclusion, the technical scheme provided by the invention overcomes the defects in the prior art, successfully completes the invention task and truly realizes the technical effects of the applicant in the technical effect column.

Claims

1. A centering deep hole drill comprises a drill body (1), wherein a first blade fixing frame seat I (11) and a second blade fixing frame seat II (12) are formed at the upper part of the drill body (1), a drill body fixing handle (13) extends from the lower part of the drill body (1), a drill body cooling liquid leading-out hole (131) is formed in the center of the drill body fixing handle (13), a centering head mounting hole (14) is formed in the upper part of the drill body (1) and in a position corresponding to the position between the first blade fixing frame seat I (11) and the second blade fixing frame seat II (12), and the bottom of the centering head mounting hole (14) corresponds to the drill body cooling liquid leading-out hole (131); the drill bit is characterized by further comprising a cutter blade fixing frame adjusting screw (5), and the cutter blade fixing frame adjusting screw (5) is in threaded connection with the right end face of the first cutter blade fixing frame I (3) or in threaded connection with the left end face of the second cutter blade fixing frame II (4) Connecting by screw thread; the drill bit main body (1) is further provided with a first blade cooling liquid guiding groove I (15) and a second blade cooling liquid guiding groove II (16), the upper end of the first blade cooling liquid guiding groove I (15) corresponds to the lower portion of the first drilling blade I (31), the lower end of the first blade cooling liquid guiding groove I (15) is communicated with the upper end of the drill bit main body cooling liquid leading-out hole (131), the upper end of the second blade cooling liquid guiding groove II (16) corresponds to the lower portion of the second drilling blade II (41), and the lower end of the second blade cooling liquid guiding groove II (16) is also communicated with the upper end of the drill bit main body cooling liquid leading-out hole (131).

2. The centering gun drill according to claim 1, characterized in that said first insert holder seat i (11) is located on the left side of the upper portion of said drill body (1) and said second insert holder seat ii (12) is located on the right side of the upper portion of said drill body (1); a first supporting step I (17a) is formed on the first blade holder base I (11) at a position corresponding to the first blade holder I (3), and a second supporting step II (17b) is formed on the second blade holder base II (12) at a position corresponding to the second blade holder II (4); the first blade fixing frame I (3) is fixed with a first blade fixing frame seat I (11) in a state of being supported on the first supporting step I (17a), and the second blade fixing frame II (4) is fixed with a second blade fixing frame seat II (12) in a state of being supported on the second supporting step II (17 b); a first drill cutting edge I (311) is formed at the upper part of each first drill cutting edge I (31), the first drill cutting edge I (311) extends out of the upper plane of the first cutting holder seat I (11), a second drill cutting edge II (411) is formed at the upper part of each second drill cutting edge II (41), and the second drill cutting edge II (411) extends out of the upper plane of the second cutting holder seat II (12); the upper end of the first blade cooling liquid guiding groove I (15) extends to the first supporting step I (17a), and the upper end of the second blade cooling liquid guiding groove (16) extends to the second supporting step II (17 b); when the blade holder adjusting screw (5) is in threaded connection with the right end face of the first blade holder I (3), the right end of the blade holder adjusting screw (5) is supported on the right side wall (17c) of the first supporting step I (17a), and when the blade holder adjusting screw (5) is in threaded connection with the left end face of the second blade holder II (4), the left end of the blade holder adjusting screw (5) is supported on the left side wall (17d) of the second supporting step II (17 b).

3. The centering deep hole drill according to claim 2, wherein a first insert holder screw hole i (111) is formed in the first insert holder seat i (11), a first insert holder seat screw i (1111) is provided at a position corresponding to the first insert holder screw hole i (111), and the first insert holder seat screw i (1111) is fixed to the rear side of the first insert holder i (3); a second blade holder seat screw hole ii (121) is formed in the second blade holder seat ii (12), a second blade holder seat screw ii (1211) is disposed at a position corresponding to the second blade holder seat screw hole ii (121), and the second blade holder seat screw ii (1211) is fixed to the front side of the second blade holder ii (4).

4. The centering deep hole drill as claimed in claim 3, characterized in that a first blade holder screw hole is provided at a rear side of the first blade holder I (3) and at a position corresponding to a first blade holder seat screw I (1111), into which the first blade holder seat screw I (1111) is screwed; and a second blade fixing frame screw hole (42) is formed in the front side of the second blade fixing frame II (4) and at a position corresponding to the second blade fixing frame seat screw II (1211), and the second blade fixing frame seat screw II (1211) is screwed into the second blade fixing frame screw hole (42).

5. The centering deep hole drill according to claim 1, characterized in that a centering head locking screw hole (18) communicating with the centering head mounting hole (14) is formed in the drill body (1), a centering head locking screw (181) is provided in the centering head locking screw hole (18), the lower end of the centering head (2) is locked to the drill body (1) at a position corresponding to the centering head mounting hole (14) by the centering head locking screw (181), and the upper end of the centering head (2) protrudes from the upper surface of the drill body (1).

6. The centering deep hole drill according to claim 2, characterized in that when said blade holder adjusting screw (5) is screw-coupled with the right end face of said first blade holder i (3), a first blade holder adjusting screw hole is formed in the right end face of said first blade holder i (3), and when said blade holder adjusting screw (5) is screw-coupled with the left end face of said second blade holder ii (4), a second blade holder adjusting screw hole (43) is formed in the left end face of said second blade holder ii (4).

7. The centering deep hole drill as claimed in claim 1 or 2, wherein said first drill inserts i (31) of said set are each fixed to the front side of said first insert holder i (3) by means of an insert first screw i (312) at a position corresponding to a first insert fixing screw hole i (32) provided in said first insert holder i (3), and said second drill inserts ii (41) of said set are each fixed to the rear side of said second insert holder ii (4) at a position corresponding to a second insert fixing screw hole ii (44) provided in said second insert holder ii (4) by means of an insert second screw ii (412); the first drilling inserts I (31) and the second drilling inserts II (41) are 180 degrees apart from each other around the circumferential direction of the drill body (1), and the first drilling inserts I (31) and the second drilling inserts II (41) are arranged on the same straight line corresponding to the left and the right.

8. The centering gun according to claim 7, characterized in that said set of first drill inserts I (31) and said set of second drill inserts II (41) are triangular in shape.

9. The centering deep hole drill according to claim 1 or 5, characterized in that a pair of centering head coolant through holes (21) penetrating from the upper end surface to the lower end surface of the centering head (2) are opened on the centering head (2), and the pair of centering head coolant through holes (21) communicate with the drill body coolant outlet hole (131).

10. The centering deep hole drill as claimed in claim 1, wherein a fixed shank locking hole (132) is formed in said bit body fixed shank (13); the lower surface of the drill bit main body (1) is provided with a pair of drill bit main body connecting rod-claw matching cavities (19), and the drill bit main body connecting rod-claw matching cavities (19) are separated by 180 degrees around the circumferential direction of the drill bit main body (1); a bit body connecting rod (6) is provided at a position corresponding to the bit body connecting rod jaw fitting cavity (19), a connecting rod coolant through hole (61) is provided at a central position in the height direction of the bit body connecting rod (6), the connecting rod coolant through hole (61) corresponds to and communicates with the bit body coolant lead-out hole (131), a shank fixing cavity (62) is provided at a central position of an end of the bit body connecting rod (6) facing the bit body fixing shank (13), a shank fixing locking screw hole (63) is provided at a position corresponding to a cavity wall of the shank fixing cavity (62), a shank fixing locking screw (631) is provided at a position of the shank fixing screw hole (63), a pair of connecting rod jaws (64) is provided at an end of the bit body connecting rod (6) facing the bit body (1) and at a position corresponding to the bit body connecting rod jaw fitting cavity (19), the drill bit body fixing handle (13) is inserted and matched with the fixing handle matching cavity (62), the fixing handle locking screw (631) extends into the fixing plate locking hole (132), and the pair of connecting rod claws (64) is matched with the pair of drill bit body connecting rod claw matching cavities (19); a connecting rod fitting (65) with an outer diameter smaller than that of the drill body connecting rod (6) extends from one end of the drill body connecting rod (6) far away from the drill body (1), a pair of clamping rod locking holes (651) are formed on the outer wall of the connecting rod fitting (65), a clamping rod (7) is arranged at a position corresponding to the connecting rod fitting (65), a connecting rod fitting sleeve (71) is formed at one end of the clamping rod (7) facing the connecting rod fitting (65), a pair of clamping rod locking screw holes (712) communicated with a fitting sleeve cavity (711) of the connecting rod fitting sleeve (71) and a cooling liquid introducing interface hole (713) are arranged on the wall body of the connecting rod fitting sleeve (71), a clamping rod locking screw (7121) is respectively arranged on the pair of clamping rod locking screw holes (712), and the connecting rod fitting (65) is inserted into the fitting sleeve cavity (711), the pair of clamping rod locking screws (7121) are screwed into the pair of clamping rod locking holes (651), and the cooling liquid introduction interface hole (713) is communicated with the connecting rod cooling liquid through hole (61) through the matching joint sleeve cavity (711); and a clamping rod fixing head (72) is formed at one end of the clamping rod (7) far away from the connecting rod matching head sleeve (71).