阅读说明：本技术 一种加工深孔中有利于改善冷却效果的枪钻结构 (Gun drill structure beneficial to improving cooling effect in deep hole machining ) 是由 黄宇鹏 刘科 于 2020-12-21 设计创作，主要内容包括：本发明公开一种加工深孔中有利于改善冷却效果的枪钻结构,包括钻杆和设于钻杆底端的钻头,所述钻杆内设有冷却水通道,所述钻头上设有切削刃,所述钻头的端部设有与所述切削刃对应设置的前喷孔,所述前喷孔轴向延伸设置并与所述冷却水通道连通,所述钻杆的侧部位于所述钻头的上方设有与所述冷却水通道连通的侧向喷孔。本发明的加工深孔中有利于改善冷却效果的枪钻结构,属于钻铣加工技术领域,在钻头上设置喷水孔,冷却效果好,保证钻孔质量,钻孔时不会因为钻头温度过高而烧伤孔壁；可以有效的保证在加工气缸盖过钉孔过程中枪钻冷却顺畅,避免在加工过程中出现铰刀烧坏和产品质量不合格的情况。(The invention discloses a gun drill structure beneficial to improving a cooling effect in deep hole machining, which comprises a drill rod and a drill bit arranged at the bottom end of the drill rod, wherein a cooling water channel is arranged in the drill rod, a cutting edge is arranged on the drill bit, a front spray hole arranged corresponding to the cutting edge is arranged at the end part of the drill bit, the front spray hole extends axially and is communicated with the cooling water channel, and a lateral spray hole communicated with the cooling water channel is arranged at the side part of the drill rod above the drill bit. The gun drill structure which is beneficial to improving the cooling effect in the deep hole machining process belongs to the technical field of drilling and milling machining, the drill bit is provided with the water spray holes, the cooling effect is good, the drilling quality is ensured, and the hole wall cannot be burned due to overhigh temperature of the drill bit during drilling; can effectually guarantee to cross the cooling of the rifle brill smooth and easy in-process of nailing hole at processing cylinder head, avoid appearing the reamer in the course of working and burn out and the unqualified condition of product quality.)

1. The utility model provides a be favorable to improving gun drill structure of cooling effect in processing deep hole, includes drilling rod (1) and drill bit (2) of locating drilling rod (1) bottom, its characterized in that, be equipped with cooling water channel (3) in drilling rod (1), be equipped with cutting edge (4) on drill bit (2), the tip of drill bit (2) be equipped with preceding orifice (5) that cutting edge (4) correspond the setting, preceding orifice (5) axial extension set up and with cooling water channel (3) intercommunication, the lateral part of drilling rod (1) is located the top of drill bit (2) be equipped with side direction orifice (6) that cooling water channel (3) communicate.

2. The gun drill structure for deep hole machining for improving cooling effect according to claim 1 is characterized in that a step surface (7) is provided between the top end of the drill head (2) and the drill rod (1).

3. The gun drill structure for deep hole machining for improving cooling effect according to claim 2 is characterized in that the lateral spray holes (6) on the drill rod (1) are arranged close to the step surface (7).

4. A gun drill structure for deep hole machining for improving cooling effect according to claim 1, 2 or 3, wherein said drill (2) is provided with two symmetrically arranged cutting edges (4), and the front end surfaces of said two cutting edges (4) are provided with transverse cutting edges (8).

5. A gun drill structure for deep hole machining for improving cooling effect according to claim 4, characterized in that the front ends of the two cutting edges (4) are provided with beveled end surfaces (9), and the cross cutting edge (8) is arranged on the back side of the beveled end surfaces (9) of the two cutting edges (4).

6. The gun drill structure for deep hole machining for improving cooling effect according to claim 5, wherein the front nozzle hole (5) is provided on the inclined end surface (9) of the cutting edge (4).

7. The gun drill structure for deep hole machining for improving cooling effect according to claim 5, wherein the thickness of the lateral cutting edge (8) is 1 mm.

8. The gun drill structure for deep hole machining for improving cooling effect according to claim 5, 6 or 7 is characterized in that the lateral spray holes (6) extend obliquely upward to the inner wall of the cooling water passage (3).

9. The gun drill structure for deep hole machining for improving cooling effect according to claim 8, wherein the diameter of the front nozzle hole (5) is 1.2mm, and the diameter of the lateral nozzle hole (6) is 1.5 mm.

Technical Field

The invention relates to a drilling and milling technology, in particular to a gun drill structure which is beneficial to improving the cooling effect in deep hole machining.

Background

In the machining process of the diesel engine cylinder cover, the diameter and the position degree of the nail passing hole are the sizes which are required to be qualified in the machining process, and the cylinder cover fastening bolt penetrates through the nail passing hole and is screwed into the cylinder body coding bolt hole to achieve the purpose of fastening the cylinder cover, so that the assembling requirement of the engine is met.

The diameter and the position degree of the nail passing hole of the cylinder cover have process requirements, and if the diameter and the position degree of the nail passing hole do not meet the process requirements, the cylinder cover fastening bolt interferes with the nail passing hole, so that the cylinder cover cannot be assembled or the cylinder cover tightening torque is influenced, and the performance of an engine is influenced. Therefore, when the nail passing hole is processed, the requirements of the diameter size and the position degree of the nail passing hole need to be ensured.

Disclosure of Invention

The present invention is directed to overcome some of the above-mentioned deficiencies in the prior art, and an object of the present invention is to provide a gun drill structure for improving cooling effect in deep hole machining while ensuring drilling accuracy.

In order to achieve the purpose, the invention provides a gun drill structure beneficial to improving the cooling effect in the deep hole machining process, which comprises a drill rod and a drill bit arranged at the bottom end of the drill rod, wherein a cooling water channel is arranged in the drill rod, a cutting edge is arranged on the drill bit, a front spray hole arranged corresponding to the cutting edge is arranged at the end part of the drill bit, the front spray hole extends axially and is communicated with the cooling water channel, and a lateral spray hole communicated with the cooling water channel is arranged at the side part of the drill rod, which is positioned above the drill bit.

Furthermore, a step surface is arranged between the top end of the drill bit and the drill rod.

Furthermore, the lateral spray holes on the drill rod are arranged close to the step surface.

Furthermore, the drill is provided with two symmetrically arranged cutting edges, and the front end surfaces of the two cutting edges are provided with transverse cutting edges.

As a further improvement, the front ends of the two cutting edges are provided with oblique end surfaces, and the cross cutting edge is arranged at the back sides of the oblique end surfaces of the two cutting edges.

Furthermore, the front spray hole is arranged on the inclined end surface of the cutting edge.

Further, the thickness of the horizontal blade is 1 mm.

Furthermore, the lateral spray holes extend obliquely upwards to the inner wall of the cooling water channel.

Furthermore, the diameter of the front spray hole is 1.2mm, and the diameter of the lateral spray hole is 1.5 mm.

Advantageous effects

Compared with the prior art, the gun drill structure for processing the deep hole and facilitating improvement of the cooling effect has the following beneficial effects:

the gun drill structure which is beneficial to improving the cooling effect in the deep hole machining process has the advantages that the drill bit is provided with the water spray holes, the cooling effect is good, the drilling quality is ensured, and the hole wall cannot be burned due to overhigh temperature of the drill bit during drilling; can effectually guarantee to cross the cooling of the rifle brill smooth and easy in-process of nailing hole at processing cylinder head, avoid appearing the reamer in the course of working and burn out and the unqualified condition of product quality.

Drawings

FIG. 1 is a front view of the gun drill structure of the present invention for improved cooling in deep holes;

fig. 2 is a left side view of the gun drill structure of the present invention for improving cooling effect in machining a deep hole.

In the figure: 1. a drill stem; 2. a drill bit; 3. a cooling water passage; 4. a cutting edge; 5. front spray holes; 6. lateral spray holes; 7. a step surface; 8. a transverse blade; 9. a beveled end face; 10. and a scrap guide groove.

Detailed Description

The invention is further described below with reference to examples, but not to be construed as being limited thereto, and any number of modifications which can be made by anyone within the scope of the claims are also within the scope of the claims.

Specific embodiments of the present invention are such that: referring to fig. 1-2, a gun drill structure for improving cooling effect in deep hole processing includes a drill rod 1 and a drill bit 2 disposed at the bottom end of the drill rod 1, the drill bit 2 and the drill rod 1 are integrally formed, a cooling water channel 3 is disposed in the drill rod 1, a cutting edge 4 is disposed on the drill bit 2, a front spray hole 5 disposed corresponding to the cutting edge 4 is disposed at the end of the drill bit 2, the front spray hole 5 extends axially and is communicated with the cooling water channel 3, and a lateral spray hole 6 communicated with the cooling water channel 3 is disposed at the side of the drill rod 1 above the drill bit 2. In the gun drill structure which is beneficial to improving the cooling effect in the deep hole, the drill bit 2 and the drill rod 1 are internally provided with the cooling water channel 3, and the temperature of the whole gun drill can be reduced by introducing cooling liquid; then, water is sprayed through the front spray holes 5 and the lateral spray holes 6, so that the temperature of the surface of the workpiece can be reduced, the temperature of the cutting edge 4 can be reduced, the cooling effect is good, the drilling quality is ensured, and the hole wall cannot be burned due to overhigh temperature of a drill bit during drilling; and the cooling liquid can reduce the temperature of iron filings and prevent burning the inner wall of the drill hole.

In the embodiment, a step surface 7 is arranged between the top end of the drill bit 2 and the drill rod 1, so that the drill rod 1 is not contacted with the inner wall of the drilled hole, and the inner wall of the drilled hole is prevented from being scratched.

In the present embodiment, two symmetrically arranged cutting edges 4 are provided on the drill 2, a transverse cutting edge 8 is provided on the front end surfaces of the two cutting edges 4, and a chip guide groove 10 of the cutting edge 4 extends at the top of the drill rod 1, and the chip guide groove 10 can discharge the iron chips generated by drilling upwards.

In this embodiment, two step surfaces 7 are correspondingly arranged on the outer side surfaces of the two cutting edges 4, the two step surfaces 7 are of a concave arc surface structure, the lateral spray holes 6 in the drill rod 1 are arranged close to the step surfaces 7, the lateral spray holes 6 are matched with the concave low points of the step surfaces 7, the step surfaces 7 can prevent scrap iron from blocking the lateral spray holes 6, the arrangement positions of the lateral spray holes 6 can ensure that cooling liquid can be smoothly sprayed to the inner wall of a drill hole, and the cooling effect is ensured.

In the embodiment, the front ends of the two cutting edges 4 are provided with the inclined end surfaces 9, the chisel edges 8 are arranged at the back sides of the inclined end surfaces 9 of the two cutting edges 4, and the inclined end surfaces 9 can reduce the contact area of the drill bit 2 and the bottom end of the hole and reduce friction.

In the present embodiment, the front nozzle hole 5 is provided on the inclined end surface 9 of the cutting edge 4.

In this embodiment, the thickness of the horizontal blade 8 is 1mm, which reduces the wear of the gun drill during the machining process and reduces the generation of the built-up edge.

In the present embodiment, the lateral spray holes 6 extend obliquely upward to the inner wall of the cooling water passage 3; the front nozzle hole 5 is disposed near the cutting edge 4.

In this embodiment, the diameter of the front spray hole 5 is 1.2mm, the diameter of the lateral spray hole 6 is 1.5mm, so that the gun drill can be cooled and scrap iron can be washed away, the cutting edge of the gun drill can be cooled by cooling water at the moment of drilling through the nail hole, and the gun drill is effectively prevented from being burnt out due to the fact that the gun drill cannot be cooled at the moment of drilling through the gun drill.

The above is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that several variations and modifications can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the utility of the patent.