CN201371263Y

CN201371263Y - Chip-dividing multi-blade tip twist drill with unsymmetrical grooves on rake face

Info

Publication number: CN201371263Y
Application number: CN200820117071U
Authority: CN
Inventors: 周安善
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-06-13
Filing date: 2008-06-13
Publication date: 2009-12-30
Anticipated expiration: 2018-06-13

Abstract

The utility model relates to a chip-dividing multi-blade tip twist drill with unsymmetrical grooves on the rake face, which is characterized by comprising a twist drill body in the multi-blade tip drill type and unsymmetrical grooves arranged on the rake face of the twist drill; and the twist drill simplifies the blade milling difficulty of a chip-dividing groove of the multi-blade tip twist drill (gang drill), and chip-dividing blades are formed on a main cutting blade due to the unsymmetrical grooves after the sharp tip of the twist drill is milled, thus greatly simplifying the milling of the chip-dividing groove of the multi-blade tip drill (gang drill).

Description

The asymmetric groove of rake face divides bits multiple-cutting-edge point fluted drill

Technical field

The utility model is to belong to a kind of high-speed steel multiple-cutting-edge point fluted drill, and the asymmetric groove of a kind of specifically rake face divides bits multiple-cutting-edge point fluted drill.

Background technology

Fluted drill was invented over more than 100 year, it is main aperture knife tool always, all produce the king bolt coil chip with its standard brill type drill steel spare hole, cause smear metal easily stifled, many unfavorable factors such as the chip removal resistance is big, therefore go up on its basis at different rapidoprints, different processing conditions, derive many advanced fluted drill brill types of planting in the world, wherein Ni Zhifu drill is exactly typical case's brill type of invention before five more than ten years, in drilling with efficiently, high-quality is celebrated, but it is at different part material, and tens kinds of brill types are arranged, and technical parameter is numerous and diverse, the all reconditionings on knife face behind the main cutting edge of its chip dividing groove, with a reconditioning once, technical difficulty is big, and the uniformity of sharpening, precision is low, cause Ni Zhifu drill to be difficult to obtain promote, excavate out a simply and effectively grinding method, be frustration Ni Zhifu drill inventor and numerous Ni Zhifu drill academic research persons' a difficult problem always.

Can invent a kind of drill bit, just moulding of chip dividing groove before dispatching from the factory, be equipped with existing mechanical sharpening crescent and chisel edge again, simplify the batch machinery production technology and the cost of multiple-cutting-edge tip bit (Ni Zhifu drill) greatly, this is that the processing of multiple-cutting-edge point fluted drill, user are desired.

Summary of the invention

In order to simplify the difficulty of multiple-cutting-edge point fluted drill (Ni Zhifu drill) chip dividing groove sharpening, the asymmetric groove of the utility model rake face divides bits multiple-cutting-edge point fluted drill parallel with front cutting edge by processing on the rake face of common fluted drill, the asymmetric groove of equal in length, need only be to after the reconditioning of fluted drill sharp angle, will simplify the reconditioning of multiple-cutting-edge tip bit (Ni Zhifu drill) chip dividing groove greatly because of asymmetric groove forms branch bits sword on the main cutting edge.

Its technical problem that solves the utility model adopt technical scheme be

What the utility model adopted is that the asymmetric groove of a kind of rake face divides bits multiple-cutting-edge point fluted drill, and it comprises the fried dough twist drill body, multiple-cutting-edge pointed drill type, the asymmetric groove on the fluted drill rake face.

It is characterized in that: the asymmetric groove on the fluted drill rake face, the drill bit of 15mm≤Φ≤45mm, going to the bottom of chip dividing groove C is that groove width Lc gets 0.13d usually, height is that groove depth hc gets 0.05d, the dovetail groove that two base angles are 45 °, slot pitch L1 is generally 0.1d, on the main cutting edge rake face, the parallel front cutting edge of groove, length is identical with front cutting edge; The drill bit of 45mm≤Φ≤76mm, on two brill lobe rake faces, a groove parallel with front cutting edge is arranged respectively, two grooves are unbearable asymmetric relatively, outer slot pitch L1 is 0.07d～0.1d, and interior slot pitch L2 is 0.15d, and groove depth hc is 0.04d, groove width Lc gets 0.075d, two base angles are 45 ° dovetail groove, and groove is parallel to front cutting edge, and length is identical with front cutting edge.

It is characterized in that: outer straight sword L length is between 0.25d～0.35d, and the high h of apex point is between 0.03d～0.1d, and chisel edge b ψ length is got between 0.05mm～0.35mm.

The beneficial effect of this practical sexual type is

Rake face has asymmetric groove, after the user need only adopt the grinding method of common fluted drill that cutting edge is carried out reconditioning, the main cutting cutting edge just can reconditioning go out a minute bits sword, simplified the processing reconditioning difficulty of Ni Zhifu drill chip dividing groove greatly, simultaneously because the parallel front cutting edge of groove, length is identical with front cutting edge, therefore, before whole drill bit scrapped, can just can grind branch bits sword by simple common reconditioning always and make drill bit have branch bits function automatically, when again this drill bit being pressed the sharpening way reconditioning of multiple-cutting-edge point fluted drill (Ni Zhifu drill), the reconditioning that can save chip dividing groove, improve the sharpening speed of multiple-cutting-edge tip bit (Ni Zhifu drill), guaranteed to divide the uniformity of bits.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is the utility model first embodiment;

Fig. 2 is the vertical view of Fig. 1 embodiment;

Fig. 3 is the axial 180 ° of revolved views of Fig. 1 embodiment;

Fig. 4 is Fig. 3 vertical view;

Fig. 5 is that the utility model second is implemented illustration;

Fig. 6 is the vertical view of Fig. 5 embodiment.

1, in Fig. 1, Fig. 2, Fig. 3, Fig. 4, chip dividing groove C go to the bottom (being groove width Lc) gets 0.13d usually, and height is that groove depth hc gets 0.05d, the dovetail groove that two base angles are 45 °, and slot pitch L1 is generally 0.1d.

2, in Fig. 1, Fig. 2, Fig. 3, Fig. 4, outside sharp angle 2 Φ are generally 125 ° between 118 °～135 °, inner edge sharp angle 2 Φ τ are between 90 °～140 °, generally get 135 °, outer edge clearance angle afc generally gets 14 ° between 10 °～16 °, circular arc edge clearance angle aRc is between 12 °～18 °, generally get 15 °, circular arc sword radius R is got 0.1d, and inner edge oblique angle τ generally gets 40 ° between 35 °～45 °.

3, in Fig. 1, Fig. 2, Fig. 3, Fig. 4, outside L length is generally got 0.3d between 0.25d～0.35d, and the high h of apex point generally gets 0.05d between 0.03d～0.1d, and chisel edge b ψ length is got and generally got 0.25mm between 0.05mm～0.35mm.

4, in Fig. 5, Fig. 6,45mm≤Φ≤76mm drill bit, outside L is that 0.25d～0.35d generally gets 0.3d, the groove C of a parallel front cutting edge is respectively arranged at its 2 brill lobe respectively, form 2 unbearable relatively asymmetric grooves, outer slot pitch L1 is 0.07d, interior slot pitch L2 is 0.15d, the groove depth hc of groove C gets 0.04d, and groove width Lc gets 0.075d, and two base angles are 45 ° dovetail groove.

The specific embodiment

Embodiment one:

1, in Fig. 1, Fig. 2, Fig. 3, Fig. 4, in the helicla flute, slot pitch L1 is 0.1d to groove C on rake face, and slot opening Lc is 0.13d, and groove depth hc is 0.04d, and the base angle is 45 ° a dovetail groove shape groove, the parallel front cutting edge of groove, and length is identical with front cutting edge.

2, in Fig. 1, Fig. 2, Fig. 3, Fig. 4, outside sharp angle 2 Φ are 125 °, and inner edge sharp angle 2 Φ τ are 135 °, and outer edge clearance angle afc is 14 °, and circular arc edge clearance angle aRc is 15 °, and circular arc sword radius R is got 0.1d, and inner edge oblique angle τ is 40 °.

3, in Fig. 1, Fig. 2, Fig. 3, Fig. 4, outside L length is 0.3d, and the high h of apex point is 0.05d, and chisel edge b ψ length is 0.25mm.

Embodiment two:

1, in Fig. 5, Fig. 6,45mm≤Φ≤76mm drill bit, outside L is 0.3d, respectively make the groove C of a parallel front cutting edge respectively at its two brills lobe, form two unbearable relatively asymmetric grooves, outer slot pitch L1 is 0.07d, and interior slot pitch L2 is 0.15d, and the groove depth hc of groove C gets 0.04d, groove width Lc gets 0.75d, 2 base angles are 45 ° dovetail groove, and outside sharp angle 2 Φ are 125 °, and inner edge sharp angle 2 Φ τ are 135 °, outer edge clearance angle afc is 14 °, circular arc edge clearance angle aRc is 15 °, and circular arc sword radius R is 0.1d, and inner edge oblique angle τ is 40 °.

2, in Fig. 5, Fig. 6, outside L length is 0.3d, and the high h of apex point is 0.05d, and chisel edge b ψ length is 0.25mm.

Claims

1, the asymmetric groove of a kind of rake face divides bits multiple-cutting-edge point fluted drill, and it comprises the fried dough twist drill body, multiple-cutting-edge pointed drill type, the asymmetric groove on the fluted drill rake face.

2, the asymmetric groove of rake face according to claim 1 divides bits multiple-cutting-edge point fluted drill, it is characterized in that: the asymmetric groove on the described fluted drill rake face, the drill bit of 15mm≤Φ≤45mm, going to the bottom of chip dividing groove C is that groove width Lc gets 0.13d usually, and height is that groove depth hc gets 0.05d, the dovetail groove that two base angles are 45 °, slot pitch L1 is generally 0.1d, on the main cutting edge rake face, the parallel front cutting edge of groove, length is identical with front cutting edge; The drill bit of 45mm≤Φ≤76mm, on two brill lobe rake faces, a groove parallel with front cutting edge is arranged respectively, two grooves are unbearable asymmetric relatively, slot pitch L1 is 0.07d～0.1d, and interior slot pitch L2 is 0.15d, and groove depth hc is 0.04d, groove width Lc gets 0.075d, two base angles are 45 ° dovetail groove, and groove is parallel to front cutting edge, and length is identical with front cutting edge.

3, the asymmetric groove of rake face according to claim 1 divides bits multiple-cutting-edge point fluted drill, it is characterized in that: outer straight sword L length is between 0.25d～0.35d, and the high h of apex point is between 0.03d～0.1d, and chisel edge b ψ length is got between 0.05mm～0.35mm.