CN2060095U - Strong cutting double worm screw - Google Patents

Abstract

The utility model relates to a strong cutting double worm screw, comprising a working portion 1 and a shank 2. The utility model is characterized in that the rake faces of two helix chip area 3 and 4 are concave curved surface shapes, two lead cutting edge 7 and 8, which are formed by that the rake faces and the main last knife faces are exchanged, are concave circular arc edges. This cause chips cut when drilling to be arc section chips, and the basic deformation of the chips is enlarged, so the chips only need to generate micro redundant deformation, and the chips can be broken off, with the result that this remarkably improves the chip breaking capability of the worm screw, at the same time, the worm screw is also provided with the advantages of the prime worm screw, the advantages lie in small drilling axial force, high stock-removing efficiency and convenient sharpening, etc., and the worm screw is suitable for drilling steel material of high rate and high efficiency or other ductility metallic material.

Description

Strong cutting double worm screw

The utility model is a kind of high-rate cutting fluted drill that relevant machining is used.

Existing high-rate cutting fluted drill, generally comprise working portion 1 and shank 2, on working portion 1, be symmetrily processed with two spirality chip areas 3 and 4, the end of working portion 1 is an apex point, form two rake faces of drill bits near two spirality chip areas 3 and 4 of apex point part, partly to be two main back knife faces 5 and 6, two rake faces with two main back knife faces intersect the conical surface on the apex point forms two main cutting edges 7 and 8, two main back knife faces 5 and 6 intersect formation chisel edge 9 at the place, axle center.The chisel edge length of this kind drill bit is relevant with the brill core diameter, generally in order to satisfy the needs of high-rate cutting fluted drill high speed, the cutting of roughing feed amount, often increased the diameter that bores core, the cross-sectional area of drill bit is increased, to increase the bending strength and the torsional rigidity of drill bit, torsional oscillation when reducing drilling improves the crudy in hole.But after boring the core diameter increase, chisel edge increases, the cutting ability variation.In order to reduce the adverse effect of chisel edge to drilling, must carry out reconditioning to chisel edge, shorten chisel edge length, increase the chisel edge anterior angle.Now also there is employing in the end of working portion 1 two helicla flutes 3 and 4, to process a narrow ditch 10 of spirality and 11 respectively near the place, axle center, and near boring core, form two sections dome arc inner edges 12 and 13, make the brill core attenuation of bit part, chisel edge shortens, replace reconditioning to chisel edge, to reduce the drilling axial force, improve the centering performance.But this kind high-rate cutting drill bit, when drill for high-speed steel material or other plastic metals, because cutting deformation is insufficient, cutting temperature is higher, and the cutting deliquescing becomes tough, and chip breaking is difficulty relatively.Often in order to reach the purpose of chip breaking, and the cutting speed of having to suitably reduce, or the direction that is parallel to main cutting edge on the rake face of drill bit grinds chip breaker, thereby limited giving full play to of its cutting ability, increased the workload of drill sharpening.Therefore develop a kind of cutting ability and chip-breaking performance is good, the novel powerful cutting fluted drill that sharpening is easy, with adapt at a high speed, the needs of efficient and automation boring, be very necessary.

The purpose of this utility model is to provide a kind of high-rate cutting fluted drill, and when drill for high-speed steel material and other plastic metals, smear metal can fracture voluntarily, need not to grind chip breaker on the drill bit rake face.

Solution of the present utility model is that the rake face of two spirality chip areas of drill bit is made concave curved surface shape, it is concave arc shape sword that two rake faces and two main back knife faces intersect two main cutting edges that form, thereby the transverse shape of the smear metal of downcutting in the time of can making drilling changes, the rectangular cross section smear metal that forms during by the drilling of linear main cutting edge becomes the cross section smear metal of concave arc shape, the basic distortion of smear metal increases, it is just broken only need to make it produce small additional deformation, therefore, improved the chip breaking effect of drill bit significantly, speed when need not to reduce drilling or on the drill bit rake face, grind chip breaker, just chip breaking voluntarily helps giving full play to the cutting ability of drill bit.

The utility model not only chip-breaking performance is good, but also has advantages such as former drill bit drilling axial force is little, the centering performance is good, and when refacing, also knife face behind the need sharpening drill bit master has been simplified sharpening formality and equipment, has reduced unproductive time, has reduced production cost.Simultaneously, this drill bit also has good cutting ability, No. 45 steel of drill bit drilling (HB120) with 12 millimeters of diameter phi, emulsion cooling with concentration 5%, cutting speed can be up to 25～40 meters/minute, 0.45 millimeter/commentaries on classics of amount of feeding up, production efficiency is 2～4 times of standard high speed steel twist drill, the drilling axial force can reduce by 30～50%, the drill bit durability significantly improves, and the crudy in hole makes moderate progress, in amount of feeding f 〉=0.2 millimeter/change, and under the machining condition of cutting speed V=16～40 meter/minute, all can form the short bits of spiral shell volume.This drill bit not only is suitable for the shallow bore hole processing of conventional engineering material, also can be used for deep hole drilling and uses on Digit Control Machine Tool and machining center lathe, is specially adapted to drill for high-speed steel material and other plastic metal materials.

Fig. 1 is a front view of the present utility model.

Fig. 2 is a left view of the present utility model.

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

The utility model as shown in drawings, comprise working portion 1 and shank 2, on working portion 1, be symmetrily processed with two spirality chip areas 3 and 4, the end of working portion 1 is an apex point, form two rake faces of drill bits near two spirality chip areas 3 and 4 of apex point part, the conical surface on the apex point partly is two main back knife faces 5 and 6, two rake faces and two main back knife faces intersect formation two main cutting edges 7 and 8, two main back knife faces 5 and 6 intersect formation chisel edge 9 at the place, axle center, end at working portion 1, locate near the axle center in two helicla flutes 3 and 4, be processed with a narrow ditch 10 of spirality and 11 respectively, and near unbearable, two sections dome arc inner edges 12 and 13 have been formed, the rake face that it is characterized in that two spirality chip areas 3 and 4 is a concave curved surface shape, and it is concave arc shape sword that two rake faces and two main back knife faces intersect two main cutting edges 7 and 8 that form.When making drilling like this, the transverse shape of the smear metal of being downcut changes, the rectangular cross section smear metal that forms during by the drilling of linear main cutting edge, become the cross section smear metal of concave arc shape, increase is out of shape in smear metal substantially, it is just broken only need to make it produce small additional deformation, has therefore improved the chip breaking effect of drill bit significantly.The working portion 1 of this kind drill bit can adopt high speed steel material to make, and also can adopt Hardmetal materials to make.In two spiral slots 3 and 4, near the axle center place narrow ditch 10 of spirality and 11 of processing respectively, its length l approximates the drill bit length of can refacing.

Claims (4)

1, a kind of high-rate cutting fluted drill, comprise working portion 1 and shank 2, on working portion 1, be symmetrily processed with two spirality chip areas 3 and 4, the end of working portion 1 is an apex point, form two rake faces of drill bits near two spirality chip areas 3 and 4 of apex point part, the conical surface on the apex point partly is two main back knife faces 5 and 6, two rake faces and two main back knife faces intersect formation two main cutting edges 7 and 8, two main back knife faces 5 and 6 intersect formation chisel edge 9 at the place, axle center, end at working portion 1, locate near unbearable in two helicla flutes 3 and 4, be processed with a narrow ditch 10 of spirality and 11 respectively, and near unbearable, two sections dome arc inner edges 12 and 13 have been formed, of the present utility modelly be characterised in that the rake face of two spirality chip areas 3 and 4 is a concave curved surface shape, it is concave arc shape sword that two rake faces and two main back knife faces intersect two main cutting edges 7 and 8 that form.

2, a kind of high-rate cutting fluted drill according to claim 1, the length that it is characterized in that the narrow ditch 10 of spirality and 11 equal the drill bit length of can refacing.

3, bore according to claim 1 or 2 described a kind of high-rate cutting mill flowers, it is characterized in that working portion 1 adopts high speed steel material to make.

4,, it is characterized in that working portion 1 adopts Hardmetal materials to make according to claim 1 or 2 described a kind of high-rate cutting fluted drills.

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