CN209239132U - New Drill Bits for Deep Hole Machining - Google Patents

Abstract

The utility model relates to a novel drill bit for deep hole processing, which comprises a clamping head, a drill shank is fixed at the bottom of the clamping head, a drill bit is fixed at the bottom of the drill shank, and a blade is fixed at the bottom of the drill bit. Long service life, not easy to break, modify the apex angle of the blade to 145 degrees, and set the blade length to 5MM. The larger the apex angle of the drill bit with the same diameter, the smaller the area of the transverse cutting edge, the smaller the chisel edge, and the smaller the contact area during cutting. The smaller the force on the cutting edge, the longer the service life of the drill bit without reducing the processing efficiency. The reason for the depth of the hole in deep hole machining is that the contact area between the drill shank and the hole increases, and the cross-sectional diameter of the drill bit is larger than that of the drill shank. The diameter is 0.2MM, and it is not easy to break during processing. By setting the surface roughness of the first spiral chip flute and the second spiral chip flute to RA0.8‑RA0.4MM, the waste chips and the first spiral chip flute, The frictional force between the second helical flutes can reduce the stress on the drill body.

Description

New Drill Bits for Deep Hole Machining

technical field

The utility model relates to a novel drill bit used for deep hole processing, which belongs to the technical field of machining tools.

Background technique

In machining, holes with a ratio of hole depth to hole diameter greater than 6 are usually called deep holes. Deep hole drill is a drill specially used for processing deep holes. It can be divided into two types: external chip removal and internal chip removal. There are gun drills, deep hole flat drills and deep hole twist drills for external chip removal; Due to the different processing systems used, there are three types of chips: BTA deep hole drill, jet drill and DF deep hole drill. Ordinary twist drills have the following deficiencies: 1: At present, the apex angle of the drill bit is 120 degrees, which is not conducive to the vacuum adsorption of stainless steel materials. Die, 2: At present, the drill bit adopts a straight shank drill bit, and the blade is long. In deep hole machining, the area of the contact hole with a long blade is too large, resulting in excessive force on the drill bit, and it is easy to break. 3: At present, the chip flutes of the drill bit are relatively rough. , Roughness is easy to cause increased chip removal friction, resulting in difficulty in chip removal during workpiece processing, resulting in excessive force on the drill bit and easy breakage, so further improvement and perfection is required.

Utility model content

The technical problem to be solved by the utility model overcomes the existing defects, and provides a new type of drill bit for deep hole processing, which has a long service life and is not easy to break. The apex angle of the blade is modified to 145 degrees, the blade length is set to 5MM, and a drill bit of the same diameter The larger the apex angle of the blade, the smaller the area of the transverse cutting edge, the smaller the chisel edge, the smaller the contact area during cutting, and the smaller the force on the blade during cutting, which can prolong the service life of the drill without reducing the processing efficiency. Deep hole processing The reason for the depth of the middle hole causes the contact area between the drill shank and the hole to increase. The cross-sectional diameter of the drill bit is 0.2MM larger than the cross-sectional diameter of the drill shank, which can reduce the force on the drill bit and is not easy to break during processing. The surface roughness of the groove and the second spiral chip flute is RA0.8-RA0.4MM, which can reduce the friction between the waste chip and the first spiral chip flute and the second spiral chip flute, and can reduce the drill body. The size of the force makes the drill body not easy to break, which can ensure the smooth processing and forming of the deep hole, and can effectively solve the problems in the background technology.

In order to solve the above technical problems, the utility model provides the following technical solutions:

A new type of drill bit for deep hole processing, including a clamping head, the bottom of the clamping head is fixed with a drill shank, the bottom of the drill shank is fixed with a drill bit, and the cross-sectional diameter of the drill bit is greater than the cross-sectional diameter of the drill shank by 0.2 MM, the bottom of the drill bit is fixed with a blade, the apex angle of the blade is set to 145 degrees, and the length of the blade edge is set to 5MM, the outer surface of the bottom of the drill shank is provided with a first spiral flute, the drill bit The outer surface is provided with a second spiral flute, and the second spiral flute is connected with the first spiral flute.

Further, the outer surface of the clamping head is equidistantly provided with limit card slots, and the limit card slots are provided with three groups.

Further, the front side surface of the drill bit is obliquely provided with chip guide grooves, and the depth of the chip guide grooves is smaller than the depth of the second helical chip guide grooves.

Further, the surface roughness of the first spiral flute and the second spiral flute is RA0.8-RA0.4MM.

Beneficial effects of the utility model: the utility model relates to a new type of drill bit for deep hole processing, which has a long service life and is not easy to break. The apex angle of the blade is modified to 145 degrees, and the length of the blade is set to 5MM. The apex angle of the drill bit with the same diameter The larger the area of the transverse cutting edge, the smaller the transverse cutting edge, the smaller the contact area during cutting, and the smaller the force on the blade during cutting, which can prolong the service life of the drill without reducing the processing efficiency. The contact area between the drill shank and the hole increases due to the reason, the cross-sectional diameter of the drill bit is 0.2MM larger than the cross-sectional diameter of the drill shank, which can reduce the force on the drill bit and is not easy to break during processing. The surface roughness of the second helical chip flute is RA0.8-RA0.4MM, which can reduce the friction between waste chips and the first helical chip flute and the second helical flute, and can reduce the force on the drill body The size makes the drill body not easy to break, which can ensure the smooth processing and forming of deep holes.

Description of drawings

The accompanying drawings are used to provide a further understanding of the utility model, and constitute a part of the description, and are used to explain the utility model together with the embodiments of the utility model, and do not constitute a limitation to the utility model.

Fig. 1 is the front view of the new drill bit used for deep hole machining of the utility model.

Symbols in the figure: 1. Clamping head; 2. Drill handle; 3. Drill bit; 4. Cutting edge; 5. First spiral chip flute; 6. Second spiral chip flute; card slot.

Detailed ways

The preferred embodiments of the present utility model are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present utility model, and are not intended to limit the present utility model.

As shown in Figure 1-, the new drill bit for deep hole processing includes a clamping head 1, the bottom of the clamping head 1 is fixed with a drill shank 2, and the bottom of the drill shank 2 is fixed with a drill 3, and the The cross-sectional diameter of the drill bit 3 is greater than the cross-sectional diameter of the drill shank 2 by 0.2MM, which can reduce the stress of the drill bit 3 and is not easy to break during processing. 145 degrees, and the length of the 4 blades of the blade is set to 5MM, the larger the vertex angle of the 3 blades of the drill bit with the same diameter, the smaller the area of the transverse cutting edge, the smaller the chisel edge, the smaller the contact area during cutting, and the force on the blade during cutting The smaller it is, the service life of the drill bit 3 can be extended without reducing the processing efficiency. The outer surface of the bottom of the drill shank 2 is provided with a first helical chip removal groove 5, and the outer surface of the drill bit 3 is provided with a second helical chip removal groove. 6, and the second spiral chip flute 6 is connected with the first spiral chip flute 5, which can speed up waste chip discharge.

The outer surface of the clamping head 1 is equidistantly provided with limit card slots 8, and the limit card slots 8 are provided with three groups to facilitate the fixed clamping of the clamp head 1 and the drilling machine, and the front surface of the drill bit 3 is inclined. The chip guide groove 7, and the depth of the chip guide groove 7 is smaller than the depth of the second spiral chip discharge groove 6, which is convenient for introducing waste chips into the inner cavity of the second spiral chip discharge groove 6, and facilitates chip removal. The surface roughness of the chip flute 5 and the second spiral chip flute 6 is RA0.8-RA0.4MM, which can reduce the friction between the waste chips and the first spiral chip flute 5 and the second spiral chip flute 6, The stress of the drill body can be reduced, so that the drill body is not easy to break.

The working principle of the utility model: modify the 4 apex angles of the blade to 145 degrees, and the blade length is set to 5MM. The larger the 4 apex angles of the drill bit 3 blades of the same diameter, the smaller the area of the transverse cutting edge, the smaller the chisel edge, and the smaller the contact area during cutting. Smaller, the smaller the force on the cutting edge 4 during cutting, the service life of the drill 3 can be extended without reducing the processing efficiency. By setting the surface roughness of the first spiral chip flute 5 and the second spiral chip flute 6 to RA0. 8-RA0.4MM, can reduce the friction between waste chips and the first helical chip flute 5 and the second helical flute 6, can reduce the force on the drill body, and make the drill body not easy to break.

The above is a preferred embodiment of the utility model, and those skilled in the art of the utility model can also change and modify the above-mentioned embodiment. Therefore, the utility model is not limited to the above-mentioned specific embodiment. Anyone skilled in the art Any obvious improvement, replacement or modification made on the basis of the present utility model belongs to the protection scope of the present utility model.

Claims (4)

1. being used for the new drill of deep hole machining, including clamping head (1), it is characterised in that: clamping head (1) the bottom fixation is set Have drillstock (2), drillstock (2) bottom is fixed with drill bit (3), and the diameter of section of the drill bit (3) is greater than drillstock (2) Diameter of section 0.2MM, drill bit (3) bottom are fixed with blade (4), and blade (4) apex angle is set as 145 degree, and described Blade (4) sword is long to be set as 5MM, and drillstock (2) bottom outside surface is equipped with the first helical flute (5), and the drill bit (3) is outside Side surface is equipped with the second helical flute (6), and second helical flute (6) is connected with the first helical flute (5).

2. the new drill according to claim 1 for deep hole machining, it is characterised in that: on the outside of the clamping head (1) Surface is equidistantly equipped with limit card slot (8), and the limit card slot (8) is equipped with three groups.

3. the new drill according to claim 1 for deep hole machining, it is characterised in that: table on front side of the drill bit (3) Face is provided tiltedly with dregs guiding groove (7), and the depth of the dregs guiding groove (7) is less than the depth of the second helical flute (6).

4. the new drill according to claim 1 for deep hole machining, it is characterised in that: first helical flute It (5) is RA0.8-RA0.4MM with the second helical flute (6) surface roughness.