CN2499154Y

CN2499154Y - High performance twist-drill

Info

Publication number: CN2499154Y
Application number: CN 01267227
Authority: CN
Inventors: 朱小坤
Original assignee: Jiangsu Tiangong Tools Co Ltd
Current assignee: Jiangsu Tiangong Tools Co Ltd
Priority date: 2001-10-24
Filing date: 2001-10-24
Publication date: 2002-07-10
Anticipated expiration: 2011-10-24

Abstract

The utility model discloses a high performance twist drill. A main cutting edge and a ditch back surface form a chip groove. The utility model is characterized in that a groove-shaped angle which is formed by the main cutting edge and ditch back surface is in an opened V shape on the spiral section of the drill edge which is perpendicular to a drill bit; the ditch back surface and the small outer arc surface which is contiguous with the flute surface are transited by a cambered surface. The twist drill which is provided by the utility model makes the thickness distribution of chips uniformly distributed along a main cutting edge when workpieces are processed, and consequently, the chips are less deformed to become straight straps and are easily exhaust from the groove channel, and meanwhile, cutting fluid can smoothly arrive in a cutting point to fully cool the cutting area. Meanwhile, the torsional strength is high, and thus, the twist drill of the utility model is particularly suitable for the drilling of the materials with the hardness between 30 to 45 HRC, such as ferrous alloy, die steel, etc.

Description

The high-performance fluted drill

Technical field:

The utility model relates to a kind of machinery tools, especially a kind of high-performance fluted drill.

Background technology:

The angle of the main cutting edge 01 of standard fluted drill of the prior art (going out as shown in phantom in Figure 3) and the ditch back side 02 formed groove passage is smaller, and generally below 100 °, the described ditch back side 02 is connected for wedge angle in the little periphery 03 adjacent with it.The fluted drill of this spline structure, its main cutting edge 01 are deep into the place, axle center of drill bit morely, form long main cutting edge, thereby its chisel edge are also just longer.This fluted drill is when cutting workpiece, the smear metal broad, and smear metal differs greatly in the speed that each cutting point flows out, it is bigger that the thickness of smear metal also differs, thus, smear metal is easier to be curled into wide spiral shell volume, the shared spatial volume of this smear metal is bigger, can formedly block up with regard to little channel of chip removal originally carry on the back 02 by main cutting edge 01 and ditch, cause chip removal not smooth, and aforesaid channel of chip removal also be the main thoroughfare that adds cutting fluid in cutting to cutting place of cutting workpiece, this passage is easily stopped up by smear metal, also make cutting fluid be difficult to flow into, thereby have influence on the cooling of cutting place, the service life of reducing drilling efficiency and drill bit.In addition, the fluted drill of said structure its bore core diameter (promptly with the cross section of the axis normal of boring on two diameter of a circles that main cutting edge is tangent) just less, the resistance to torsion of this fluted drill is not high yet.

Summary of the invention:

The purpose of this utility model is to improve the deficiencies in the prior art, thereby thereby providing a kind of can make smear metal can successfully also can be arrived cutting point swimmingly and can fully be cooled off the high-performance fluted drill that obtains higher drilling efficiency to cutting region by the discharge of groove passage, while cutting fluid along the relatively more even little one-tenth vertical bar of chip deformation of thickness distribution of main cutting edge.

For achieving the above object, the utility model is taked following design:

The main cutting edge of this fluted drill and the ditch back side form chip area, be characterized in that flute profile angle that described main cutting edge becomes with the ditch antiform is open V-arrangement on the cross section perpendicular to the drill lip helix of this drill bit, the angle of described flute profile angle on this cross section is 100～150 °; The described ditch back side and with between its adjacent little exterior arc surface with the cambered surface transition.

This fluted drill is changed the shape and the size at the flute profile angle of existing standard fluted drill, two limits with flute profile of the prior art angle, especially the structural change of ditch back side back bending becomes open V-arrangement, increased the angle at flute profile angle simultaneously, in addition, the fluted drill of this structure with " the cross sharpening " and method handle after, than existing drill bit, its chisel edge and main cutting edge shorten, reduce the negative rake at chisel edge place, and the root of main cutting edge is away from the brill core, so, depth of cut in cutting is evenly distributed along main cutting edge, chip deformation is little, basic one-tenth vertical bar can be discharged very trippingly along described chip area, the blocked problem of helical flute can not occur, simultaneously, cutting fluid also just can arrive cutting region swimmingly, cutting region is cooled off fully, therefore, the drilling efficiency of this fluted drill is improved, in addition, owing to increased the flute profile angle, making at this drill bit becomes approximate rectangle perpendicular to the cross section on the drill axis direction, this shows, bore core thickness and thicken, generally can increase thickness and reach 50～100%, so improved the torsional strength of drill bit than existing unit-type drill head.

Better for the chip removal performance that makes this drill bit, on the surface of described chip area, be provided with titanium aluminum alloy coating.

The high-performance fluted drill that the utility model provides is based on above-mentioned each architectural feature, thereby make smear metal can successfully also can arrive cutting point swimmingly and can fully cool off to cutting region by the discharge of groove passage, while cutting fluid along the relatively more even little one-tenth vertical bar of chip deformation of thickness distribution of main cutting edge, simultaneously, its torsional strength height, therefore, fluted drill of the present utility model is specially adapted to the drilling of hardness at materials such as the ferrous alloy of 30～45HRC, mould steel.

Description of drawings:

The utility model is described in further detail below in conjunction with accompanying drawing.

The axial arrangement schematic diagram of the fluted drill that Fig. 1 provides for the utility model

Fig. 2 is the A-A cutaway view of Fig. 1

Fig. 3 is the B-B cutaway view of Fig. 1

The specific embodiment:

As shown in Figure 1 promptly be the high-performance fluted drill 1 that the utility model provides; Fig. 2 shows the cross-section structure perpendicular to the helix of fluted drill 1; Fig. 3 shows the cross-section structure perpendicular to the axis of fluted drill 1, and shown in the dotted line wherein is the cross sectional shape of existing standard fluted drill.

The main cutting edge 11 of this fluted drill 1 and the ditch back side 12 form chip area 14, the flute profile angles that main cutting edge 11 and the ditch back of the body 12 forms are open V-arrangement at the cross section upper angle α perpendicular to the drill lip helix of this drill bit, the helical angle of drill lip helix is 32 °, and apex angle ss is 135 °.The angle [alpha] of flute profile angle on this cross section for example is 110 °; The described ditch back side and with between its adjacent little exterior arc surface 13 with the arc surface transition.

As seen from Figure 3, the root of main cutting edge 11 is away from the brill core, so, depth of cut in cutting is evenly distributed along main cutting edge, chip deformation is little, becomes vertical bar substantially, can discharge very trippingly along described chip area 14, the blocked problem of helical flute 14 can not appear, simultaneously, cutting fluid also just can arrive cutting region swimmingly, and cutting region is cooled off fully, in addition, owing to increased the flute profile angle, making at this drill bit becomes approximate rectangle perpendicular to the cross section on the drill axis direction, thus, bore core thickness and thicken, improved the torsional strength of drill bit than existing unit-type drill head.

On the surface of chip area 14, be provided with titanium aluminum alloy coating.

Claims

1, a kind of high-performance fluted drill, its main cutting edge and the ditch back side form chip area, it is characterized in that: the flute profile angle that the described main cutting edge and the ditch back side form is open V-arrangement on the cross section perpendicular to the drill lip helix of this drill bit; The described ditch back side and with between its adjacent little exterior arc surface with the cambered surface transition.

2, high-performance fluted drill according to claim 1 is characterized in that: the angle [alpha] of described flute profile angle on described cross section is 100～150 °.

3, high-performance fluted drill according to claim 1 and 2 is characterized in that: be provided with titanium aluminum alloy coating on the surface of described chip area.