CN201030447Y

CN201030447Y - Highly effective auger-drill head

Info

Publication number: CN201030447Y
Application number: CNU2007200059778U
Authority: CN
Inventors: 骆权德
Original assignee: DONGGUAN CITY MICROCREATE Co Ltd
Current assignee: DONGGUAN CITY MICROCREATE Co Ltd
Priority date: 2007-03-29
Filing date: 2007-03-29
Publication date: 2008-03-05
Anticipated expiration: 2017-03-29

Abstract

The utility model discloses a highly effective spiral bit which comprises a tool bit (1), wherein the tool bit (1) is provided with a spiral flute (2). The end of the tool bit (1) is provided with a cutting portion which comprises two symmetrical cutting edges (3), two symmetrical auxiliary cutting edges (7) and a first rear tool flank (5). The tool bit (1) forms a front tool flank (6) at the inner portion of the spiral flute (2), and forms a back (13) at the back portion of the spiral flute (2). The utility model is characterized in that on the back (13), along the direction of the two auxiliary cutting edges (7), two symmetrical second rear tool flanks (8) which are intersected with the first rear tool flank (5) are arranged on the two upper edges of the utility model. The utility model has the advantages of convenient for discharging scraps and cooling, further the cutting efficiency is improved in a great range.

Description

A kind of efficient spiral bit

Technical field

The utility model relates to a kind of machining tool, relates to a kind of second back knife face, and efficient spiral bit of drilling efficiency significantly of being arranged with on the back of back drill bit particularly.

Background technology

In the product parts process of machine-building, the workload of hole processing accounts for more than 30%; And the high speed steel twist drill head is the blade tool that present application surface is the widest, usage frequency is the highest, specification is maximum.How since over half a century, produced the producer of high speed steel twist drill head, be standard with 118 ± 2 ° outside point angle, offers the user; But for the user, be actually a kind of blank sword type, it can't produce high benefit to the processing of various types of materials.Therefore, all high speed steel twist drill heads of purchasing from the market must carry out secondary and reface and could use positions such as its outside and chisel edges.And in the sharpening of this traditional type, the most of the time all consumes again on the outside and chisel edge of sharpening drill bit, and higher to skilled worker's specification requirement, tends to influence production efficiency.Shortcomings such as simultaneously this drill bit also exists the apex point height, chisel edge is wide and long, and main cutting edge each point anterior angle numerical value differs greatly, and back is too thick influence the service life and the stock-removing efficiency of drill bit; Though people have carried out multiple improvement to it, such as Ni Zhifu drill having occurred, multiple brill types such as " S " type brill, improved the cutting ability of fluted drill to a certain extent, improved stock-removing efficiency, prolonged service life, but, still restricted the further raising in fluted drill stock-removing efficiency and service life because its back is thicker.

The utility model content

At the existing above-mentioned deficiency of spiral bit in the prior art, the purpose of this utility model is, provides a kind of by changing existing high speed steel twist drill head back shape and thickness, need not to reface and can improving the efficient spiral bit of sharpening speed and drilling efficiency.

For achieving the above object, the technical scheme that the utility model adopted is:

A kind of efficient spiral bit, it comprises a cutter head; Establishing one on the described cutter head has spiral goove, is provided with a cutting part in the end of this cutter head; This cutting portion comprises the cutting edge of two symmetries, the front cutting edge of two symmetries and major first flank; This cutter head forms a rake face in the inside of this spiral goove, the rake face rear portion forms a knife back, it is characterized in that: on the knife back of described back, along two front cutting edge directions, also be arranged with the second back knife face that two upper limbs and described major first flank intersect.

The described second back knife face is an inclined-plane, and its intersecting lens with major first flank is parallel with the structure basal plane; The angle of itself and structure basal plane is 20～45 degree.

Advantage of the present utility model is:

1, increased drill edge chip space on every side, made chip removal more quick and smooth and easy;

2, cooling-lubricant can enter around the drill edge quickly, makes heat in metal cutting than descending quickly in the past;

3, under the processing conditions situation identical with the drill bit durability, drilling efficiency improves more than 3 times than the drill bit of traditional type sharpening;

Below in conjunction with description of drawings and embodiment the utility model is further described.

Description of drawings

Fig. 1 is the front view of the utility model embodiment;

Fig. 2 is the perspective view of Fig. 1.

The specific embodiment

Embodiment: referring to Fig. 1, Fig. 2, the utility model provides a kind of efficient spiral bit, and it comprises a cutter head 1; Establishing one on the described cutter head 1 has spiral goove 2, is provided with a cutting part in the end of this cutter head 1; This cutting portion comprises the front cutting edge 7 and the major first flank 5 of 3, two symmetries of cutting edge of two symmetries; Front cutting edge 7 intersects outer rim turning point 14 with cutting edge 3, and this cutter head 1 forms a rake face 6, forms a back 13 at its rear portion in the inside of this spiral goove 2; On described back 13, along two front cutting edges, 7 directions, also be arranged with the second back knife face 8 that two upper limbs and described major first flank 5 intersect.

The described second back knife face 8 is an inclined-plane, and its intersecting lens 12 with major first flank 5 is parallel with structure basal plane 10; The angle 11 of itself and structure basal plane 10 is 20～45 degree; In the present embodiment 30 degree.Described structure basal plane 10 is the planes by cutter head (1) axial line, two outer rim turning points 14.

Adopt the described same or analogous structure of the utility model the foregoing description, resulting other efficient spiral bit is all within protection domain.

Claims

1. efficient spiral bit, it comprises a cutter head (1); Establishing one on the described cutter head (1) has spiral goove (2), is provided with a cutting part in the end of this cutter head (1); This cutting portion comprises the cutting edge (3) of two symmetries, front cutting edge of two symmetries (7) and major first flank (5); This cutter head (1) forms a rake face (6), forms a back (13) at its rear portion in the inside of this spiral goove (2), it is characterized in that: on described back (13), along two front cutting edges (7) direction, also be arranged with the second back knife face (8) that two upper limbs and described major first flank (5) intersect.

2. efficient spiral bit according to claim 1 is characterized in that, the described second back knife face (8) is an inclined-plane, and its intersecting lens (12) with major first flank (5) is parallel with structure basal plane (10); The angle (11) of itself and structure basal plane (10) is 20～45 degree.