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CN-224209157-U - Deep hole internal cooling step drill with chip breaker

CN224209157UCN 224209157 UCN224209157 UCN 224209157UCN-224209157-U

Abstract

The utility model belongs to the technical field of drill bits, in particular to a deep hole inner cooling step drill with chip breaking grooves, which aims at solving the problems that the existing step drill adopts an integrated design, the worn part can not be replaced independently and the whole drill bit can only be abandoned or repaired integrally, and the utility model provides a scheme that the deep hole inner cooling step drill comprises a drill rod, a first step drill and a second step drill, wherein the second step drill is connected with the first step drill through a positioning inserted rod, a threaded rod and a fastening nut, can realize that the second step bores alone is dismantled and is changed, when the second step bores wearing and tearing, only need to change this part, need not to change whole drill bit, the cost is reduced, the resource utilization rate has been improved, and maintenance personnel can directly tear down the second step of wearing and tearing bores, change or maintain, need not to carry out complicated repair operation to whole drill bit, maintenance time and human cost have been saved, maintenance efficiency has been improved, can let equipment put into production again more fast, reduce the down time that leads to because of equipment maintenance.

Inventors

  • WANG DAJUAN
  • ZHAO WEI
  • CHAO JIANGUO

Assignees

  • 常州市纳固精密工具有限公司

Dates

Publication Date
20260508
Application Date
20250421

Claims (7)

  1. 1. The deep hole inner cooling step drill with the chip breaking grooves comprises a drill rod (1), a first step drill (2) and a second step drill (3), and is characterized in that the first step drill (2) is fixedly connected to the bottom end of the drill rod (1), the second step drill (3) is arranged on the bottom surface of the first step drill (2), and the drill rod (1), the first step drill (2) and the second step drill (3) are connected coaxially; The surface symmetry of drilling rod (1) has seted up mounting hole (10), mounting hole (10) run through inside first step bores (2) to extend to the bottom side that first step bored (2), the surface symmetry fixedly connected with location inserted bar (16) of second step bore (3), the mounted position and the mounting hole (10) of location inserted bar (16) are corresponding, every the equal fixedly connected with threaded rod (17) in top of location inserted bar (16), every fastening nut (21) have all been cup jointed to the equal screw thread in surface of threaded rod (17), second step bores (3) and is connected with first step bores (2) through the cooperation of location inserted bar (16), threaded rod (17) and fastening nut (21).
  2. 2. The deep hole inner cooling step drill with the chip breaker groove according to claim 1, wherein the drill rod (1) and the first step drill (2) are provided with first inner cooling liquid channels (6) at the central axis positions, the first inner cooling liquid channels (6) penetrate through the drill rod (1) and the first step drill (2) respectively, the first step drill (2) is internally provided with first branch channels (7) at two sides of the first inner cooling liquid channels (6) symmetrically, the first branch channels (7) penetrate through the first step drill (2) and extend to the outer sides of the first step drill (2), the first branch channels (7) are communicated with the first inner cooling liquid channels (6), the second step drill (3) is provided with second inner cooling liquid channels (19) at the central axis positions, the second step drill (3) is communicated with the first inner cooling liquid channels (6), the second step drill (3) is internally provided with second branch channels (19) symmetrically located at two sides of the second inner cooling liquid channels (6), and the second step drill (20) are communicated with the second branch channels (20) extending to the outer sides of the second step drill (3).
  3. 3. The deep hole inner cooling step drill with the chip breaking grooves according to claim 2, wherein the surface of the first step drill (2) is provided with a first chip breaking groove (4), the surface of the second step drill (3) is provided with a second chip breaking groove (8), the first chip breaking groove (4) and the second chip breaking groove (8) are all arranged in a spiral shape, and the first chip breaking groove (4) and the second chip breaking groove (8) are communicated.
  4. 4. The deep hole inner cooling step drill with chip breaking grooves according to claim 3, wherein the surface of the first step drill (2) is provided with a first chip breaking groove (5), and the surface of the second step drill (3) is provided with a second chip breaking groove (9).
  5. 5. The deep hole inner cooling step drill with the chip breaker groove according to claim 4, wherein diamond-shaped positioning grooves (11) are symmetrically formed in the bottom surface of the first step drill (2) on two sides of the first inner cooling liquid channel (6), springs (12) are fixedly connected in each diamond-shaped positioning groove (11), a diamond plate (13) is fixedly connected to the bottom end of each spring (12), the diamond plate (13) can slide in each diamond-shaped positioning groove (11), diamond-shaped positioning blocks (15) are symmetrically and fixedly connected to the two sides of the second inner cooling liquid channel (19) on the surface of the second step drill (3), and the diamond-shaped positioning blocks (15) are matched with the diamond-shaped positioning grooves (11).
  6. 6. The deep hole inner cooling step drill with the chip breaker groove according to claim 5, wherein the bottom surface of the first step drill (2) is located at the outer side of the circumference of the first inner cooling liquid channel (6) and provided with an annular sealing groove (14), the bottom surface of the second step drill (3) is located at the outer side of the circumference of the second inner cooling liquid channel (19) and fixedly connected with an annular sealing ring (18), and the annular sealing groove (14) is matched with the annular sealing ring (18).
  7. 7. The deep hole inner cooling step drill with chip breaker groove according to claim 1, wherein the surface of the fastening nut (21) is provided with a plurality of jacks (22) in a circular array.

Description

Deep hole internal cooling step drill with chip breaker Technical Field The utility model relates to a step drill, in particular to a deep hole inner cooling step drill with chip breaking grooves, and belongs to the technical field of drill bits. Background Deep hole machining is a very challenging task in the field of machining, with stringent requirements on the performance and reliability of the drilling tool. Currently, deep hole inner cooling step drills with chip breaking grooves widely applied to deep hole machining are generally of a pagoda type structure. In the actual drilling operation, the structure mainly relies on the lower drill bit to drill holes in advance, and then the upper drill bit is used for reaming. In the existing step drill, for example, in the step drill disclosed in patent number CN214815120U, a transition surface is arranged between a step and a conical surface to form arc transition, when the step drill is used for processing a thin plate, when the step drill passes through one step to the next step, the cutting width is gradually increased from the arc starting point, so that the impact force can be relieved, the drill bit is not easy to be blocked due to over-cutting, however, in the deep hole processing process, the lower drill bit faces more complicated working conditions and larger cutting resistance due to the fact that the lower drill bit is born with an initial drilling task, the use frequency is far higher than that of the upper drill bit, the lower drill bit is extremely easy to wear, and once the drill bit is worn, the worn part cannot be replaced independently due to the integral design of the existing step drill, and only the whole drill bit can be abandoned or repaired integrally. The whole waste not only causes great resource waste and cost increase, but also delays the construction period for frequent replacement of new drills for some items with tense processing period. And the whole repair needs professional equipment and technology, the repair process is complex and takes longer time, the processing efficiency is affected, and the production benefit of enterprises is reduced. Disclosure of utility model The utility model provides a deep hole inner cooling step drill with chip breaking grooves, which aims to solve the problems that the existing step drill adopts an integrated design, the worn part can not be replaced independently, and the whole drill bit can only be abandoned or repaired integrally. The deep hole inner cooling step drill with the chip breaking groove comprises a drill rod, a first step drill and a second step drill, and is characterized in that the first step drill is fixedly connected to the bottom end of the drill rod, the second step drill is arranged on the bottom surface of the first step drill, and the drill rod, the first step drill and the second step drill are coaxially connected; The mounting hole has been seted up to the surface symmetry of drilling rod, the mounting hole runs through inside the first step is bored to extend to the bottom side that the first step bored, the surface symmetry fixedly connected with location inserted bar that the second step bored, the mounted position and the mounting hole of location inserted bar are corresponding, the equal fixedly connected with threaded rod in top of every location inserted bar, fastening nut has all been cup jointed to the equal screw thread in surface of every threaded rod, the second step is bored and is connected with first step through the cooperation of location inserted bar, threaded rod and fastening nut, the second step is bored and is connected with first step through location inserted bar, threaded rod and fastening nut. As a still further scheme of the utility model, the drill rod and the first step drill are respectively provided with a first internal cooling liquid channel at the central axis position, the first internal cooling liquid channels respectively penetrate through the drill rod and the inside of the first step drill, the inside of the first step drill is symmetrically provided with a first branch channel at the two sides of the first internal cooling liquid channel, the first branch channel penetrates through the first step drill and extends to the outer side of the first step drill, the first branch channel is communicated with the first internal cooling liquid channel, the second step drill is provided with a second internal cooling liquid channel at the central axis position, the second internal cooling liquid channel is communicated with the first internal cooling liquid channel, the inside of the second step drill is symmetrically provided with second branch channels at the two sides of the second internal cooling liquid channel, the second branch channels penetrate through the second step drill and extend to the outer side of the second step drill, and the second branch channels are communicated with the second internal cooling liquid channels. As a