CN105033329A

CN105033329A - Twist drill for machining material with chips difficult to break

Info

Publication number: CN105033329A
Application number: CN201510534883.9A
Authority: CN
Inventors: 仲益; 栾华健; 沈斌; 金章斌
Original assignee: SUZHOU AHNO CUTTING TOOL TECHNOLOGY Co Ltd
Current assignee: SUZHOU AHNO CUTTING TOOL TECHNOLOGY Co Ltd
Priority date: 2015-08-27
Filing date: 2015-08-27
Publication date: 2015-11-11

Abstract

The invention relates to a twist drill for machining a material with chips difficult to break. A cutter body and a handle are coaxial cylinders with the same central axis as the center. Spiral chip grooves are ground in the cutter body, and solid parts, except the chip grooves, of the cutter body are cutter backs. A rear cutter face is ground at the end face position of the head of the cutter, and main cutting edges are formed by crossed lines of the rear cutter face and the chip grooves. A chip discharging part and an edge part joined with the chip discharging part are formed on the cutter body. Each main cutting edge comprises a first apex angle section, a transition circular arc section and a second apex angle section which are joined in sequence. The double-apex-angle design of the large apex angles and the small apex angles is adopted, and iron chips are deformed twice to achieve the chip breaking effect; centering of a drill bit is facilitated in the machining process through the design of a central small apex angle; circular arc transition is adopted between the large apex angles and the small apex angles, so that stress concentration is reduced, abrasion of the drill bit is slowed down, and the shape of the iron chips can be controlled; the smoothness degree of the hole surface after the material difficult to machine is machined is effectively improved; and due the fact that the chip breaking problem is solved, the iron chips can be smoothly discharged out, and it is avoided that the hole wall is scratched by the iron chips.

Description

For the fluted drill of difficult processing chip breaking material

Technical field

The present invention relates to a kind of fluted drill for difficult processing chip breaking material, belong to fluted drill technical field.

Background technology

At present, modern industry produce in, use the mechanical performances such as the intensity of material, hardness, toughness to improve constantly.In these materials, as stainless steel, aluminium alloy, copper, high temperature alloy and titanium alloy etc. belong to difficult-to-machine material.During these materials of drilling, due to the good toughness of material, chip is frangibility not, and again because drilling is semiclosed processing, chip is not easily discharged, and makes drilling be difficult to carry out smoothly.Therefore, during this kind of difficult-to-machine material of drilling, during the large material of especially drilling toughness, chip breaking process is particularly important.The key of chip process is exactly must rationally chip breaking.

Summary of the invention

The object of the invention is the deficiency overcoming prior art existence, a kind of fluted drill for difficult processing chip breaking material is provided.

Object of the present invention is achieved through the following technical solutions:

For the fluted drill of difficult processing chip breaking material, feature is: comprise cutter hub and shank, cutter hub and shank are the coaxial clyinders centered by same central axis, described cutter hub grinds helical form chip area, entity part outside chip area is the knife back, the endface position mill of cutter head body has rear knife face, the intersection of rear knife face and chip area forms main cutting edge, the blade that cutter hub forms chip removal portion and is connected with it, described main cutting edge comprises the first drift angle section, transition circle segmental arc and the second drift angle section that are connected successively.

Further, the above-mentioned fluted drill for difficult processing chip breaking material, wherein, angle on described two main cutting edges between the first drift angle section is 100 ° ~ 110 °, angle between second drift angle section is 145 ° ~ 155 °, the radius of curvature of transition circle segmental arc is 0.5d1 ~ 0.55d1, and the radial distance on two main cutting edges between transition circle segmental arc and the second drift angle section tie point is 0.35d1 ~ 0.4d1, and wherein d1 is the diameter of blade.

Further, the above-mentioned fluted drill for difficult processing chip breaking material, wherein, the axial length L 1=hole depth+1.5d1+10mm in described chip removal portion, wherein d1 is the diameter of blade.

Again further, the above-mentioned fluted drill for difficult processing chip breaking material, wherein, the diameter of described shank is the minimum even number value being more than or equal to d1, and wherein d1 is the diameter of blade.

The substantive distinguishing features that technical solution of the present invention is outstanding and significant progress are mainly reflected in:

1. adopt the Double Tops angle of large drift angle and little drift angle to design, make iron filings through twice distortion, thus reach the effect of chip breaking;

2. the little drift angle in center is designed with the centering being beneficial to drill bit and adding man-hour;

3. adopt arc transition between size drift angle, reduce stress and concentrate, slow down bit wear, iron filings shape can be controlled simultaneously;

4. be applicable to the hole machined of difficult chip breaking material, effectively improve the fineness that difficult-to-machine material processing metapore shows, owing to solving chip breaking problem, iron filings are discharged smoothly, avoid iron filings to scratch hole wall.

Accompanying drawing explanation

Fig. 1: the structural representation of fluted drill of the present invention;

Fig. 2: the structural representation of the another kind of mode of the present invention;

Fig. 3: the structural representation of fluted drill blade;

The close-up schematic view in A portion in Fig. 4: Fig. 3.

Detailed description of the invention

Below in conjunction with accompanying drawing, technical solution of the present invention is described further:

As shown in Figure 1 and Figure 2, for the fluted drill of difficult processing chip breaking material, comprise cutter hub and shank 3, cutter hub and shank 3 are the coaxial clyinders centered by same central axis, cutter hub has ground helical form chip area 4, the entity part outside chip area 4 is the knife back 5, and the endface position mill of cutter head body has rear knife face, the intersection of rear knife face and chip area 4 forms main cutting edge, the blade 1 that cutter hub forms chip removal portion 2 and is connected with it.

As shown in Figure 3, Figure 4, main cutting edge comprises the first drift angle section 6, transition circle segmental arc 7 and the second drift angle section 8 that are connected successively.Transition circle segmental arc 7 is between the first drift angle section 6 and the second drift angle section 8.

Angle on two main cutting edges between the first drift angle section is 100 ° ~ 110 °, centering effect is good, angle between second drift angle section is 145 ° ~ 155 °, the radius of curvature of transition circle segmental arc is 0.5d1 ~ 0.55d1, radial distance, d 3 on two main cutting edges between transition circle segmental arc and the second drift angle section tie point is 0.35d1 ~ 0.4d1, and wherein d1 is the diameter of blade.

The axial length L 1=hole depth+1.5d1+10mm in chip removal portion, wherein d1 is the diameter of blade.

The diameter d 2 of shank is the minimum even number value being more than or equal to d1, and wherein d1 is the diameter of blade.Length L2 is according to standard DIN6535-HA design, and cutter overall length is L.

Adopt the Double Tops angle of large drift angle and little drift angle to design, make iron filings through twice distortion, thus reach the effect of chip breaking; The little drift angle in center is designed with the centering being beneficial to drill bit and adding man-hour; Adopt arc transition between size drift angle, reduce stress and concentrate, slow down bit wear, iron filings shape can be controlled simultaneously.

The present invention is applicable to the hole machined of difficult chip breaking material, conventional drill can cause processing resistance to increase owing to twining bits when difficult processing chip breaking material, seriously cause breaking, and drill bit of the present invention effectively can improve the fineness that difficult-to-machine material processing metapore shows, owing to solving chip breaking problem, iron filings are discharged smoothly, avoids iron filings to scratch hole wall.

It is to be understood that: the above is only the preferred embodiment of the present invention; for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims

1. for the fluted drill of difficult processing chip breaking material, it is characterized in that: comprise cutter hub and shank, cutter hub and shank are the coaxial clyinders centered by same central axis, described cutter hub grinds helical form chip area, entity part outside chip area is the knife back, the endface position mill of cutter head body has rear knife face, the intersection of rear knife face and chip area forms main cutting edge, the blade that cutter hub forms chip removal portion and is connected with it, described main cutting edge comprises the first drift angle section, transition circle segmental arc and the second drift angle section that are connected successively.

2. the fluted drill for difficult processing chip breaking material according to claim 1, it is characterized in that: the angle on described two main cutting edges between the first drift angle section is 100 ° ~ 110 °, angle between second drift angle section is 145 ° ~ 155 °, the radius of curvature of transition circle segmental arc is 0.5d1 ~ 0.55d1, radial distance on two main cutting edges between transition circle segmental arc and the second drift angle section tie point is 0.35d1 ~ 0.4d1, and wherein d1 is the diameter of blade.

3. the fluted drill for difficult processing chip breaking material according to claim 1, is characterized in that: the axial length L 1=hole depth+1.5d1+10mm in described chip removal portion, wherein d1 is the diameter of blade.

4. the fluted drill for difficult processing chip breaking material according to claim 1, is characterized in that: the diameter of described shank is the minimum even number value being more than or equal to d1, and wherein d1 is the diameter of blade.