CN111774617A

CN111774617A - Drill bit

Info

Publication number: CN111774617A
Application number: CN202010636359.3A
Authority: CN
Inventors: 陈立新
Original assignee: Taizhou Yingluoke Tools Co ltd
Current assignee: Taizhou Yingluoke Tools Co ltd
Priority date: 2020-07-03
Filing date: 2020-07-03
Publication date: 2020-10-16
Anticipated expiration: 2040-07-03
Also published as: CN111774617B

Abstract

The invention discloses a drill bit, and relates to a cutter, and the technical scheme is as follows: the drill bit comprises a drill bit part for drilling and a clamping part for clamping a power device, wherein the drill bit part and the clamping part can relatively slide along the axial direction of the drill bit part and the clamping part, and a key groove structure is arranged between the drill bit part and the clamping part and used for transmitting torque; the drill bit is internally provided with a cavity, the clamping part is provided with a guide rod towards the drill bit part, the drill bit part is provided with a guide hole for the guide rod to pass through, the guide rod and the guide hole establish sliding seal, the guide rod penetrates into the cavity, the end part of the guide rod, which is positioned in the cavity, is provided with a piston, the piston is in sliding contact with the wall of the cavity and establishes sliding seal, the piston separates the cavity into a sealing cavity close to the clamping part and a movable cavity far away from the clamping part, and the outer wall of the drill bit part is. When the feed speed of the power device is too high, the drill bit is not easy to be damaged or broken due to too high temperature; the drill bit pivoted stability is high, and the equipment of being convenient for, and the radiating effect is good.

Description

Drill bit

Technical Field

The invention relates to a cutter, in particular to a drill bit.

Background

The drill bit is a tool for drilling, and is most widely used as a twist drill in machining.

The Chinese patent with the prior application publication number of CN107186253A discloses a high-abrasion twist drill bit, which comprises a handle part, a neck part, a twist drill bit body, a drilling head and a guide part; the handle is connected with the neck, the neck is connected with the twist drill body, one end of the twist drill body is provided with a drilling head, and the drilling head is connected with a guide part; be equipped with several coolant liquid runners in the drill bit, the coolant liquid runner runs through to the guide part right-hand member from the stalk portion left end, and the coolant liquid runner is used for the heat dissipation.

The above prior art solutions have the following drawbacks: the drill bit is arranged on the power head and driven by the power head to rotate, and the automatic equipment generally controls the automatic feed of the drill bit; if the cutting feed speed is too fast when the drill bit contacts the material with high hardness, the drill bit is stressed too much at the cutting feed speed, and the drill bit is damaged due to too high temperature or broken easily.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a drill bit, which is not easy to be damaged or broken due to overhigh temperature when the feed speed of a power device is overhigh.

The technical purpose of the invention is realized by the following technical scheme: a drill bit comprises a drill bit part for drilling and a clamping part for clamping a power device, wherein a spiral chip groove is formed in the side wall of the drill bit part, the drill bit part and the clamping part are independent parts, the drill bit part and the clamping part can slide relative to each other along the axial direction of the drill bit part and the clamping part, and a key groove structure is arranged between the drill bit part and the clamping part and used for transmitting torque;

the utility model discloses a drilling tool, including drill bit portion, guide arm, piston, clamping part, piston, guide rod and guide hole, be equipped with the cavity in the drill bit portion, the clamping part is equipped with the guide arm towards the drill bit portion, the drill bit portion is equipped with the guide hole that supplies the guide arm to pass, the guide arm establishes sliding seal with the guide hole, the guide arm penetrates in the cavity, the tip that the guide arm is located the cavity is equipped with the piston, piston and the chamber wall sliding contact of cavity establish sliding seal, the piston separates the cavity for the sealed chamber that is close to the clamping part, keeps away from the.

Through above-mentioned technical scheme, when power device cliied the clamping part and rotated, through the linkage effect of keyway structure, drill bit portion produced synchronous rotation along with the clamping part. When the drill bit part is in a drilling state, if the hardness of a workpiece is high, the moving resistance of the drill bit part is increased, at the moment, even if the feed speed of the power device is not changed, the drill bit part can move towards the clamping part in a self-adaptive mode, in the process, the guide rod slides in the guide hole, and the volume of the sealing cavity is increased. Air in the movable cavity automatically enters the through hole and is discharged out of the drill bit.

Because the sealing cavity is expanded, the air pressure of the sealing cavity is smaller than the external air pressure, and the differential pressure can act on the piston, so that the drill bit part has elastic force for tightly abutting against the workpiece; because the drill bit part acts on the workpiece through the elastic force, the speed of the drill bit drilling into the workpiece can be reduced in a self-adaptive manner, and the drill bit is not easy to be damaged or broken due to overhigh temperature.

Preferably, the key groove structure comprises a connecting key fixed on the drill bit part and a key groove arranged on the clamping part, the length directions of the key groove and the connecting key are along the axial direction of the drill bit part, and the connecting key is in sliding contact with the key groove; the key groove and the connecting key are arranged in a plurality along the circumferential direction of the drill bit.

Through the technical scheme, the plurality of key grooves and the plurality of connecting keys are arranged, so that the torque transmitted from the clamping part to the drill bit part is more reliable; and the sliding connection of the clamping part and the drill bit part can be realized.

Preferably, the outer cover barrel section of clamping part tip is located including the cover to drill bit portion, the outer wall sliding contact of cover barrel section through inner wall and clamping part, the connecting key is fixed in the inner wall of cover barrel section, the contact surface of connecting key, keyway is the frosting.

Through above-mentioned technical scheme, the cover barrel section can be protected including the guide arm, prevents that guide arm and iron fillings contact and produce the damage. Through setting up the frosting, when drill bit portion produced the removal for the clamping part, the air in the cover barrel section can pass in and out this drill bit through the frosting smoothly, prevents to hold back in the cover barrel section and feel suffocated.

Preferably, the guide rod and the guide hole realize sliding sealing through the matching mode of the plunger sleeve.

Through the technical scheme, the sliding seal can be directly realized by the matching mode of the plunger sleeve, and an elastic sealing structure is not required to be arranged.

Preferably, the drill bit part is fixed with a sealing gasket, the sealing gasket is positioned at the opening of the guide hole, and the guide rod penetrates through the sealing gasket and establishes sliding seal with the sealing gasket.

Through above-mentioned technical scheme, sealed the pad and be used for further guaranteeing the leakproofness between guide arm, guide hole.

Preferably, the drill bit portion includes fixed connection's linkage segment, working segment, the linkage segment is located between clamping part, the working segment, the chip groove is located the working segment, the linkage segment is located to the guide hole, the sealed chamber is close to the chamber wall of clamping part and is formed by the outer wall of linkage segment.

Through the technical scheme, when the connecting section is arranged in front of the working section, the processing of the cavity and the assembly of the piston and the guide rod are facilitated.

Preferably, a cooling flow passage is provided through the bit portion and the clamping portion.

Through above-mentioned technical scheme, equipment can let in the coolant liquid to the cooling runner of drill bit, and the coolant liquid carries out high-efficient heat dissipation to the drill bit, improves the cutting performance of drill bit and work piece simultaneously.

Preferably, the cooling flow channel axially penetrates through the clamping part, the guide rod and two ends of the piston along the clamping part, and the cooling flow channel is communicated with the movable cavity.

Through above-mentioned technical scheme, the setting of the cooling runner of being convenient for, and can not produce the interference to the use of clamping part, drill bit portion.

Preferably, the through hole is located at an end of the drill part facing away from the clamping part.

Through above-mentioned technical scheme, the most advanced of drill bit is the core position that generates heat, locates the through-hole here, and the coolant liquid that the through-hole leads to can play splendid radiating effect to the drill bit.

In summary, compared with the prior art, the beneficial effects of the invention are as follows:

1. when the feed speed of the power device is too high, the drill bit is not easy to be damaged or broken due to too high temperature;

2. the drill bit has high stability in rotation and is convenient to assemble;

3. the heat dissipation effect of the drill bit is good.

Drawings

FIG. 1 is a perspective view of a drill bit according to a first embodiment;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is an exploded view of a drill bit according to the first embodiment;

FIG. 4 is a schematic view of the working conditions of the first embodiment;

FIG. 5 is a cross-sectional view of a drill according to a second embodiment, mainly illustrating the structure of the cooling channels.

In the figure, 1, a drill bit part; 2. a clamping portion; 11. a working section; 12. a connecting section; 13. a sleeve segment; 3. a keyway structure; 111. a chip groove; 4. a cavity; 21. a guide bar; 121. a guide hole; 122. a gasket; 22. a piston; 41. sealing the cavity; 42. a movable cavity; 112. a through hole; 31. a connecting bond; 32. a keyway; 5. and cooling the flow channel.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The first embodiment is as follows:

referring to fig. 1 and 2, the drill disclosed by the invention comprises a drill bit part 1 for drilling and a clamping part 2 clamped by a power device, wherein the drill bit part 1 and the clamping part 2 are both cylindrical, and the axes of the drill bit part 1 and the clamping part 2 are overlapped. The bit part 1 and the clamping part 2 are independent parts, and the bit part 1 and the clamping part 2 can relatively slide along the axial direction.

The drill bit part 1 comprises a working section 11 and a connecting section 12 which are fixedly connected, the connecting section 12 is located between the clamping part 2 and the working section 11, the drill bit part 1 further comprises a sleeve section 13 which is sleeved outside the end part of the clamping part 2, and the sleeve section 13 and the connecting section 12 are integrally fixed. The key groove structure 3 is arranged between the sleeve section 13 and the clamping part 2 and is used for transmitting torque.

The end of the working section 11 departing from the clamping part 2 is the tip of the drill, and the side wall of the working section 11 is provided with a spiral chip groove 111. Be equipped with cavity 4 in the drill bit portion 1, cavity 4 is the cylindrical cavity, and the length direction of cavity 4 is along the length direction of working segment 11, and the cross section of cavity 4 is circular, and cavity 4 runs through working segment 11 to linkage segment 12 direction. The connecting section 12 is fixed to the working section 11 by welding, and the connecting section 12 closes the mouth of the cavity 4.

A guide rod 21 is fixed on the clamping part 2 towards the drill bit part 1, the length direction of the guide rod 21 is along the axial direction of the clamping part 2, a guide hole 121 for the guide rod 21 to pass through is formed in the connecting section 12, the guide rod 21 and the guide hole 121 realize sliding sealing through the matching mode of a plunger sleeve, and the matching clearance is 0.0015-0.0025 mm. The surface of the connecting section 12 facing away from the working section 11 is fixed with a sealing gasket 122, the sealing gasket 122 is made of rubber, the sealing gasket 122 is located at the opening of the guide hole 121, the guide rod 21 passes through the sealing gasket 122 and establishes a sliding seal with the sealing gasket 122, and the sealing gasket 122 is used for further ensuring the sealing performance between the guide rod 21 and the guide hole 121.

The guide rod 21 penetrates into the cavity 4, the end part, located in the cavity 4, of the guide rod 21 is provided with the piston 22, the outer side wall of the piston 22 is provided with the sealing ring, the piston 22 is in sliding contact with the cavity wall of the cavity 4 through the sealing ring and establishes sliding sealing, the piston 22 divides the cavity 4 into a sealing cavity 41 close to the clamping part 2 and a movable cavity 42 far away from the clamping part 2, and the cavity wall, close to the clamping part 2, of the sealing cavity 41 is formed by the outer wall of the connecting section 12. The number of the guide rods 21 in this embodiment is two, and the two guide rods 21 are symmetrical with respect to the center of the axis of the drill. The outer wall of the working section 11 is provided with a through hole 112 communicated with the movable cavity 42, the through hole 112 is positioned at a position far away from the connecting section 12, and air in the movable cavity 42 can freely circulate with the outside through the through hole 112; the size of the through-hole 112 is preferably small to prevent foreign iron pieces from entering the movable chamber 42.

Referring to fig. 2 and 3, the sleeve segment 13 is in sliding contact with the outer wall of the grip portion 2 through the inner wall. The key groove structure 3 comprises a connecting key 31 fixed on the sleeve section 13 and a key groove 32 arranged on the clamping part 2, the connecting key 31 is integrally fixed on the inner wall of the sleeve section 13, and the length directions of the key groove 32 and the connecting key 31 are along the axial direction of the drill bit part 1. The key grooves 32 and the key grooves 31 are in one-to-one correspondence and in sliding contact with each other, the relative sliding direction of the key grooves 31 and the key grooves 32 is along the axial direction of the holder 2, and the number of the key grooves 32 and the key grooves 31 is plural along the circumferential direction of the drill. The contact surface of the connecting key 31 and the key groove 32 is a frosted surface, and the frosted surface of the embodiment is specifically arranged on the groove wall of the key groove 32. When the connecting key 31 is in sliding contact with the key groove 32, air can circulate through the contact position of the connecting key 31 and the key groove 32, and liquid cannot easily pass through the contact position of the connecting key 31 and the key groove 32.

The working conditions of the drill bit are as follows:

referring to fig. 4, when the power device clamps the clamping part 2 and rotates, the bit part 1 rotates synchronously with the clamping part 2 through the connection action of the key groove structure 3 and the guide rod 21. When the drill bit portion 1 is in a drilling state, if the hardness of the workpiece is high, the resistance to movement of the drill bit portion 1 increases, and at this time, even if the feed speed of the power unit does not change, the drill bit portion 1 adaptively moves in the direction of the clamping portion 2, and in the process, the volume of the seal cavity 41 increases, and the guide rod 21 slides in the guide hole 121.

Because the sealed cavity 41 is expanded, the air pressure of the sealed cavity 41 is smaller than the external air pressure, and the pressure difference acts on the piston 22, so that the drill bit part 1 has an elastic force for tightly abutting against the workpiece; because the drill bit part 1 acts on the workpiece through the elastic force, the speed of the drill bit drilling into the workpiece can be reduced in a self-adaptive manner, the drill bit is not easy to be damaged due to overhigh temperature, and the drill bit is not easy to break.

Due to the expansion and contraction, the air temperature in the sealed cavity 41 is reduced after the volume of the sealed cavity 41 is expanded, so as to prevent the drill bit from overheating. When the drill bit part 1 is poorly cooled, the temperature of the drill bit part 1 rises to raise the temperature of the air in the sealed cavity 41, so that the air in the sealed cavity 41 expands and the air pressure rises, at this time, the force (i.e., the elastic force) of the drill bit part 1 moving in the direction away from the clamping part 2 is reduced, the pressure of the drill bit part 1 acting on the workpiece is reduced, the heat generated during drilling is reduced, and the effect of relieving overheating is achieved.

After the feeding action of the power device is finished, the drill bit can still drill into partial depth under the action of elastic force by keeping rotating for a certain time. When the resistance of the drill bit part 1 for drilling is reduced, the elastic force can urge the drill bit part 1 to move and reset towards the direction far away from the clamping part 2, so that the drill bit can complete the drilling work with the required depth.

Example two:

referring to fig. 5, the difference between the second embodiment and the first embodiment is that: a cooling flow passage 5 is arranged through the drill bit part 1 and the clamping part 2. The cooling flow passage 5 penetrates through the clamping part 2, the guide rod 21 and two ends of the piston 22 along the axial direction of the clamping part 2, and the cooling flow passage 5 is communicated with the movable cavity 42. The through hole 112 is located at the end of the drill bit part 1 facing away from the clamping part 2, and the through hole 112 is used for discharging cooling liquid out of the drill bit so as to dissipate heat of the contact part of the drill bit part 1 and the workpiece.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. A drill bit, includes drill bit portion (1) that is used for drilling, the clamping part (2) that supplies the power device centre gripping, the lateral wall of drill bit portion (1) is equipped with spiral helicine chip groove (111), characterized by: the drill bit part (1) and the clamping part (2) are independent parts, the drill bit part (1) and the clamping part (2) can slide relatively along the axial direction of the drill bit part and the clamping part, and a key groove structure (3) is arranged between the drill bit part (1) and the clamping part (2) and used for transmitting torque;

be equipped with cavity (4) in boring head portion (1), clamping part (2) are equipped with guide arm (21) towards boring head portion (1), boring head portion (1) is equipped with guide hole (121) that supply guide arm (21) to pass, guide arm (21) and guide hole (121) establish sliding seal, guide arm (21) penetrate in cavity (4), the tip that guide arm (21) are located cavity (4) is equipped with piston (22), piston (22) and the chamber wall sliding contact of cavity (4) establish sliding seal, piston (22) separate cavity (4) for be close to sealing chamber (41) of clamping part (2), keep away from movable chamber (42) of clamping part (2), the outer wall of boring head portion (1) is equipped with through-hole (112) of intercommunication movable chamber (42).

2. A drill bit according to claim 1, wherein: the key groove structure (3) comprises a connecting key (31) fixed on the drill bit part (1) and a key groove (32) arranged on the clamping part (2), the length directions of the key groove (32) and the connecting key (31) are along the axial direction of the drill bit part (1), and the connecting key (31) is in sliding contact with the key groove (32); the key grooves (32) and the connecting keys (31) are arranged along the circumferential direction of the drill bit.

3. A drill bit according to claim 2, wherein: drill bit portion (1) is including cover sleeve section (13) of locating clamping part (2) tip outside, sleeve section (13) is through the outer wall sliding contact of inner wall with clamping part (2), connect key (31) to be fixed in the inner wall of sleeve section (13), the contact surface of connecting key (31), keyway (32) is the frosting.

4. A drill bit according to claim 1, wherein: the guide rod (21) and the guide hole (121) realize sliding sealing through the matching mode of the plunger sleeve.

5. A drill bit according to claim 4, wherein: the drill bit part (1) is fixedly provided with a sealing gasket (122), the sealing gasket (122) is positioned in the hole of the guide hole (121), and the guide rod (21) penetrates through the sealing gasket (122) and establishes sliding seal with the sealing gasket (122).

6. A drill bit according to claim 1, wherein: drill bit portion (1) is including fixed connection's linkage segment (12), working segment (11), linkage segment (12) are located between clamping part (2), working segment (11), chip groove (111) are located working segment (11), linkage segment (12) are located in guide hole (121), sealed chamber (41) are close to the chamber wall of clamping part (2) and are formed by the outer wall of linkage segment (12).

7. A drill bit according to claim 1, wherein: a cooling flow channel (5) is arranged through the drill bit part (1) and the clamping part (2).

8. A drill bit according to claim 7, wherein: the cooling flow channel (5) penetrates through the two ends of the clamping part (2), the guide rod (21) and the piston (22) along the axial direction of the clamping part (2), and the cooling flow channel (5) is communicated with the movable cavity (42).

9. A drill bit according to claim 8, wherein: the through hole (112) is located at the end of the drill bit part (1) facing away from the clamping part (2).