CN-117733213-B - BTA drill bit with shock-absorbing structure and use method

CN117733213BCN 117733213 BCN117733213 BCN 117733213BCN-117733213-B

Abstract

The invention discloses a BTA drill bit with a damping structure and a use method thereof, and belongs to the technical field of machining. The structure comprises a drill bit component. The drill bit part comprises a guide block, a blade seat, a blade, an O-shaped ring, a drill bit and an outer tube, wherein the O-shaped ring is fixed through a boss structure on a drill bit rod to absorb shock, then cooling liquid is introduced between the outer tube and the drill bit, one part of the cooling liquid flows into a chip removal channel through an inclined hole on the drill bit rod to approach the chip removal channel so as to promote chip removal, the other part of the cooling liquid flows into a working area through a round hole on a drill bit step to cool the blade, and cut chips are driven to flow into the chip removal channel at the same time, so that the effects of shock absorption, cooling and emission promotion are finally realized. The invention can realize the functions of shock absorption, cooling and the like, better ensures the coaxiality of processing and reduces the damage of the drill bit, thereby having the characteristics of simple structure and long service life.

Inventors

CHEN ZHENYU
DU LIANMING
LU CHUANJIE
LU XUGE
ZHANG ZONGYI
QI XUDONG
ZHAO JIANGTAO

Assignees

济南大学

Dates

Publication Date: 20260512
Application Date: 20231220

Claims (10)

1. A BTA drill bit with a shock absorption structure is characterized by comprising a drill bit head and a drill rod, wherein the drill bit head and the drill rod are integrally formed, a blade is arranged on the drill bit head, threads are further arranged on the rear half portion of the drill bit head and are used for realizing connection between the drill bit head and an outer pipe, a plurality of bosses are arranged on the drill rod, O-shaped rings are sleeved on each boss, a chip removing channel is arranged in the center of the inside of the drill bit along the axis direction of the drill bit, a plurality of jet holes are further arranged on the drill rod, the axes of the jet holes are obliquely arranged, a cooling hole is further arranged on the drill bit head, after the drill bit is matched with the outer pipe through threads, a gap is formed between the outer pipe and the drill rod, and after cooling liquid enters from the gap between the drill bit head and the outer pipe, a part of cooling liquid enters the cooling hole and a part of cooling liquid enters the jet holes.
2. The BTA bit with shock absorbing structure according to claim 1, wherein the front end of the bit is conical, the rear end of the bit is cylindrical in a stepped shape, and the thread is provided at the rear end of the bit.
3. The BTA drill with shock absorbing structure in accordance with claim 2, wherein the stepped cylindrical shape comprises a first section cylinder of major diameter and a second section cylinder of minor diameter, the threads opening to the second section cylinder.
4. The BTA drill with shock absorbing structure according to claim 3, wherein a guide bar is provided on the first section cylinder.
5. The BTA drill with shock absorbing structure according to claim 1, wherein the axis of the cooling hole is parallel to the axis of the drill.
6. The BTA drill bit with shock absorbing structure according to claim 1, wherein two of the cooling holes are provided symmetrically with respect to the axis of the drill bit.
7. The BTA drill with shock absorbing structure according to claim 1, wherein the jet hole is at an angle of 30-60 ° to the bit axis.
8. The BTA drill with shock absorbing structure of claim 1 wherein the jet hole is provided in a plurality of turns, each turn being provided in a plurality.
9. The BTA drill with shock absorbing structure of claim 1 wherein the boss is provided in a plurality of turns, each turn being provided in a plurality.
10. The method of using a BTA drill bit having a shock absorbing structure according to any one of claims 1-9, wherein: The drill bit is matched with the outer pipe through threads, a gap is formed between the outer pipe and the drill rod, after cooling liquid enters from the gap, a part of cooling liquid flows through the cooling holes to cool blades on the drill bit, then the part of cooling liquid flows back to a chip removing channel in the middle of the drill bit along with chips to form an internal cooling internal chip removing circulation structure, another part of cooling liquid is ejected from the jet holes and then pushes chips in the chip removing channel to move towards the tail part of the drill rod along the chip removing channel, and the cooling liquid entering the chip removing channel through the jet holes in the drilling process integrally flows backwards to reduce the air pressure in the drill rod, so that the pressure of the head part of the drill bit is higher than the pressure in the chip removing channel, the flow of the liquid is accelerated, and meanwhile, the cooling liquid ejected from the jet holes can effectively clean the hole wall and accelerate the discharge of the chips.

Description

BTA drill bit with shock-absorbing structure and use method Technical Field The invention belongs to deep hole machining technology in the field of machining, and particularly relates to a BTA drill bit with a damping structure and a use method thereof. Background When deep hole processing, because the contact surface of cutter and work piece is great, produce the vibration easily, lead to machining precision to descend, surface quality worsens, because the contact surface of cutter and work piece is great, the cutting heat that produces is more, leads to the cutter to overheat easily, wearing and tearing aggravate, influences machining precision and efficiency, and cutting fluid and smear metal can pile up in the processing region, if not in time get rid of, can influence machining precision and efficiency. In patent EP3231544B1 an ejector deep hole drilling tool is disclosed, consisting of a replaceable drill bit, drill rod, chuck, connector and flange, but the outer tube of the patent cannot be disassembled, and in addition there is no jet hole, no cooling hole nor a good method of facilitating the removal of chips from the inner hole. The patent with the application number of CN201910324413.8 discloses an intelligent high-strength BTA drill bit for deep hole machining, which comprises a BTA drill bit and a drill rod, wherein a through-length cooling liquid channel is coaxially arranged in the drill rod along an axis, the BTA drill bit is connected to the head end of the drill rod, the tail section of the drill rod is provided with external square threads, jet holes penetrating through the cooling liquid channel are symmetrically arranged on the head section of the drill rod, the jet holes are in a cosine rule shape with large outer port diameter and small inner port diameter, the axes of the two jet holes and the axis of the cooling liquid channel are positioned on the same plane, but the jet holes with other chord rules are difficult to machine, the machining is difficult to be implemented, the number of the jet holes involved in the patent is small, the positions of the jet holes are arranged on the throat of the drill rod, and the flushing capacity is limited. The BTA drill bit mostly adopts the mode of external cooling and internal chip removal to cause pollution and waste of cooling liquid, meanwhile, the external cooling can not effectively cool the inside of the drill bit, and in addition, the rigidity of the whole structure of the split structure is poor, and the drill bit and a drill rod are easy to loosen during processing. The patent application number CN201821065805.4 discloses a BTA deep hole machining drill bit with jet holes, which comprises a BTA drill bit and a connecting rod, wherein the front end of the connecting rod is connected with the BTA drill bit, the connecting rod is a through pipe body, a plurality of jet holes are uniformly arranged along the circumferential direction, the intersection point of the jet hole axis and the connecting rod axis is positioned behind the jet holes, but the jet holes are only arranged at the throat part and are circumferentially distributed with openings, so that the structural rigidity of the drill bit is greatly reduced, and the flow speed of the drill bit is slow and is not beneficial to the discharge of chips. The BTA drill bit mostly adopts the mode of external cooling and internal chip removal to cause pollution and waste of cooling liquid, meanwhile, the external cooling can not effectively cool the inside of the drill bit, and in addition, the rigidity of the whole structure of the split structure is poor, and the drill bit and a drill rod are easy to loosen during processing. Disclosure of Invention The technical problem to be solved by the invention is to provide the BTA drill with the shock absorption structure, so that the drill is required to have good shock absorption, cooling and emission promotion effects, the machining precision is ensured, the loss of a cutter is reduced, and the machining efficiency is improved. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: The invention further provides a BTA drill bit with the shock absorption structure, the BTA drill bit comprises a drill bit head and a drill rod, the drill bit head and the drill rod are integrally formed, a blade is arranged on the drill bit head, threads are further arranged on the rear half portion of the drill bit head and are used for realizing connection between the drill bit head and an outer pipe, a plurality of bosses are arranged on the drill rod, O-shaped rings are sleeved on each boss, a chip removal channel is arranged in the center of the inside of the drill bit along the axis direction of the drill bit, a plurality of jet holes are further arranged on the drill rod, the axes of the jet holes are obliquely arranged, a cooling hole is further arranged on the drill bit head, after the drill bit is matched with t