CN2463091Y

CN2463091Y - Multi-tip and edge group drill

Info

Publication number: CN2463091Y
Application number: CN 01220344
Authority: CN
Inventors: ***
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-04-28
Filing date: 2001-04-28
Publication date: 2001-12-05
Anticipated expiration: 2011-04-28

Abstract

The utility model relates to a multi-tip multi-edge group drill. The drill point of the utility model is composed of a drill-point tip (24), two arcuate tips (25), and two chip dividing tips (26), two outer edges (27), two circular-arc edges (28), two inner edges (29), a chisel edge (31) and a chip dividing edge (30). For making the group drill be suitable for the mechanical sharpening of industrialization, the cross section of a chip dividing groove (22) which is milled on the back tool surface (32) on one side of the outer edge is a V-shaped slot which is provided with a circular-arc bottom, and the circular-arc radius R of the circular-arc edges is enlarged to make the ratio of the circular-arc radius R of the circular-arc edges and the diameter d of the drill bit be 0.11 to 0.15. the shape angle of the inner edges 2 phi< tau > can be also reduced to 131 DEG to 133 DEG, and/or the chisel edge angle psi can be enlarged to that the psi is larger than 65 DEG and is smaller or equal to 70 DEG for rising the centering ability of the drill point. The sharp angle of the outer edges 2 phi can also be reduced to 121 DEG to 123 DEG for rising the durability.

Description

The Multi-tip and edge Ni Zhifu drill

It (is the Ni Zhifu drill bit that the utility model relates to a kind of Multi-tip and edge Ni Zhifu drill, be called for short MFD), this drill bit comprises apex point part and targeting part, this apex point partly comprises five sharp eight swords, promptly unbearable point, two arc blade tips and two branch bits blade tips, two outsides, two circular arc swords, two inner edges, a chisel edge, a branch bits sword.

Applicant of the present utility model exists durability low, stock-removing efficiency low major defect to set about study tricuspid seven cutting drill heads in Yongding, Beijing machinery plant at common fluted drill in the fifties initial stage, after exploitation is shaped into 64 formulas " Ni Zhifu drill bit ", obtain the certificate of invention that State Scientific and Technological Commission issues in nineteen sixty-five, certificate number is 00057.After this, again it has been done improvement, on the back knife face of one side outside, grind rectangle or circular arc chip dividing groove, thereby obtained this specification and begun the five sharp eight sword Ni Zhifu drills that part is mentioned, further improve the cutting speed that divides bits, chip removal situation and accelerated unbearable point, obtained the gold medal and the diploma of United Nations World Intellectual Property Organization in 1986.In " Ni Zhifu drill---Ni Zhifu drill bit " book of publishing by Shanghai science tech publishing house nineteen eighty-two " Ni Zhifu drill " book, especially in the September, 1999 of publishing by Shanghai science tech publishing house to the detailed introduction of contrasting of the structure of improving development situation and various Ni Zhifu drills of above-mentioned Ni Zhifu drill and parameter.But such Ni Zhifu drill relatively is fit to hand grinding, if adopt mechanical sharpening to need high-precision Digit Control Machine Tool; In addition, but it is still having improvements aspect centering ability and the durability.

The purpose of this utility model provides a kind of Multi-tip and edge Ni Zhifu drill that is suitable for industrialization machinery sharpening.

For this reason, the utility model Multi-tip and edge Ni Zhifu drill is made up of apex point part and targeting part, this apex point partly has five sharp eight swords, two main cutting edge ecto-entad respectively is divided into outside, the circular arc sword, three sections of inner edges, a chisel edge that is positioned at the apex point centre is arranged between two inner edges, form seven swords, this two outside and two circular arc swords intersect two arc blade tips of formation, the outer end rounding off of the inner of two circular arc swords and two inner edges, and the chisel edge between two inner edges becomes the unbearable point in this apex point centre, formation is the center with unbearable point, two arc blade tip symmetries are positioned at the tricuspid of its both sides, grind chip dividing groove on the back knife face of a side outside therein, thereby in the outside of this side, form a branch bits sword again, and the outside of this branch bits sword and this side intersects and forms two branches and consider blade tips to be worth doing, this chip dividing groove is that cross section is the vee-cut that has circular arc-shaped bottom portion, and the arc radius R of this circular arc sword is 0.11-0.15 with the ratio of this bit diameter d.

Because the utility model is changed the shape of chip dividing groove into have circular arc-shaped bottom portion V-arrangement by rectangle or circular arc, the arc radius that meanwhile suitably adds the orthodrome sword, this two place improves and just can make this Ni Zhifu drill can adopt mechanical sharpening more easily, thereby helps making the manufacturing of this Ni Zhifu drill to form industrialization.

As further improvement of the utility model, can suitably reduce inner edge sharp angle 2 φ _τ, make them between 131 °-133 °, perhaps strengthen the oblique angle ψ of chisel edge, be between 65 °＜ψ≤70 °, take one of these two kinds of measures to can further improve the centering ability of apex point,, then can obtain better apex point centering ability if this two corrective measure is adopted simultaneously.

As another kind of improvement the of the present utility model, can also reduce outside sharp angle 2 φ, make them between 121 °-123 °, thereby can improve the radiating condition at this outside outer rim place, further improve the durability of drill bit.

Below in conjunction with accompanying drawing the specific embodiment of the present utility model is described in further detail:

Fig. 1 is the front view of Ni Zhifu drill in the prior art;

Fig. 2 is the vertical view of Ni Zhifu drill shown in Figure 1;

Fig. 3 is the front view of the utility model Ni Zhifu drill;

Fig. 4 is the vertical view of the utility model Ni Zhifu drill;

Fig. 5 utilizes emery wheel circular arc sword, inner edge and the chisel edge three's of the utility model Ni Zhifu drill back knife face to be carried out the schematic diagram of mechanical sharpening;

Fig. 6 is the vertical view of mechanical sharpening shown in Figure 5;

Fig. 7 utilizes emery wheel the inner edge rake face of the utility model Ni Zhifu drill to be carried out the schematic diagram of mechanical sharpening.

Fig. 1 and Fig. 2 have provided the front view and the vertical view of 67 formula drill bits in the basic model Ni Zhifu drill of introducing in " Ni Zhifu drill---Ni Zhifu drill bit " book of publishing in September, 1999.This drill bit is made up of apex point part (being cutting tip) 1 and targeting part 2, and apex point part 1 has five sharp eight swords.As seen from Figure 1, Figure 2, two main cutting edges of this apex point part 1 are divided into three sections, and being respectively between outside 27, circular arc sword 28 and inner edge 29, two inner edges 29 from outside to inside is to be positioned at the chisel edge 31 apex point centre, very narrow.Two outsides 27 are intersections of knife face 32 and spiral flute rake face 37 behind the outside, and two circular arc swords 28 are by the intersection of knife face behind the crescent 34 with spiral flute rake face 37, and two inner edges 29 are intersections of knife face 34 and the inner edge rake face 35 of reconditioning behind the crescent.The outer end 33 and the minor flank (claiming land again) 38 of two outsides join, and inner and circular arc sword 28 joins, and the other end of circular arc sword 28 is connected with inner edge 29 outer ends are slick and sly, and the two ends of chisel edge 31 link to each other with the inner of two inner edges 29 respectively.Two outsides 27 and two circular arc swords 28 intersect and form behind two arc blade tips, 25, two crescents that knife face 34 intersects and form unbearable point 24 at the drill axis place.Knife face 34 is the back knife face of circular arc sword 28 behind this crescent, is again the back knife face of inner edge 29 and chisel edge 31, and it is parts of anchor ring at circular arc sword 28 places, then is the plane at inner edge 29 and chisel edge 31 places.Adopt such structure, just form seven swords (two outsides 27, two circular arc swords 28, two inner edges 29 and a chisel edge 31) in apex point part 1 eight swords and the tricuspid in five points (24 and two of unbearable points are positioned at unbearable sharp both sides, symmetrical arc blade tip 25), it is " the W shape sword " that unbearable point 24 is shunk back, both sides arc blade tip 25 is existed side by side with respect to fluted drill that this two circular arcs sword 28, two inner edges 29 and chisel edge 31 form one.On knife face 32 behind the outside of one side, grind chip dividing groove 23, thereby in the outside 27 of this side, form branch bits sword 20, i.e. the 8th sword of this apex point part again; This branch bits sword 20 forms two branch bits blade tips 26, i.e. the 4th point and the 5th point of apex point part again with the intersection of this side outside 27.This 67 formula drill bit has seven sharpening length parameters and seven sharpening angle parameters.If this bit diameter is d, these grinding parameters respectively as shown in Table 1.

Table one

Sharpening length		Sharpening angle
Sharpening length		Sharpening angle		Point is high	h=0.04d	The outside sharp angle	2φ=125°
Arc radius	R=0.1d	The inner edge sharp angle	2φ _τ=135°	Point is high	h=0.04d	The outside sharp angle	2φ=125°
Arc radius	R=0.1d	The inner edge sharp angle	2φ _τ=135°	Outside is long	L=0.3d (d＞15) or 0.2d (d≤15)	Interior angle of cutting edge	γ _τc=-15°
The chip dividing groove distance	L ₁=L/4-L/3	The inner edge oblique angle	τ=20°-30°	Outside is long	L=0.3d (d＞15) or 0.2d (d≤15)	Interior angle of cutting edge	γ _τc=-15°
The chip dividing groove distance	L ₁=L/4-L/3	The inner edge oblique angle	τ=20°-30°	Chip dividing groove is wide	L ₂=L/3-L/2	The chisel edge angle	ψ=60°-65°
Chip dividing groove is dark	C=1-1.5mm	Outer edge clearance angle	α _fc=10°-15°	Chip dividing groove is wide	L ₂=L/3-L/2	The chisel edge angle	ψ=60°-65°
Chip dividing groove is dark	C=1-1.5mm	Outer edge clearance angle	α _fc=10°-15°	Chisel edge is long	b _ψ=0.04d	The circular arc relief angle	α _Rc=12°-18°

Fig. 3 and Fig. 4 have provided the front view and the vertical view of the utility model Ni Zhifu drill, its structure is identical with 67 formula Ni Zhifu drills illustrated in figures 1 and 2 basically, for simplicity's sake, its structure something in common do not remake be repeated in this description, its same structure parts have adopted the Reference numeral identical with Fig. 1 and Fig. 2.The utility model Ni Zhifu drill has mainly been made three aspects with respect to 67 formula Ni Zhifu drills and has been improved.The improvement of first aspect is in order to make Ni Zhifu drill adopt mechanical sharpening more easily, rectangle chip dividing groove 23 (referring to Fig. 1,2) or circular arc chip dividing groove (not providing among the figure) with 67 formula Ni Zhifu drills changes Fig. 3 and the V-arrangement chip dividing groove 22 that has circular arc-shaped bottom portion shown in Figure 4 into for this reason, the sidewall angle of the V-arrangement chip dividing groove that has circular arc-shaped bottom portion that provides among Fig. 3 is 90 °, i.e. square; Meanwhile add the arc radius R of orthodrome sword, be located between the 0.11d-0.15d, so just help realizing utilizing emery wheel that the utility model is carried out mechanical sharpening, make it adapt to the industrialization needs.Relevantly how it to be carried out mechanical sharpening, will be described further by means of Fig. 5 to Fig. 7 in the back with emery wheel.The utility model Ni Zhifu drill can be made the centering ability of the improvement of second aspect with further raising apex point on the improved basis of above-mentioned first aspect, can adopt two measures for this reason: reduce inner edge sharp angle 2 φ _τ, be located at 131 °-133 ° or strengthen the chisel edge angle, be 65 °＜ψ≤70 °, adopt one of this two measure just can improve its centering ability, if adopt this two corrective measure simultaneously, can obtain the better apex point ability of feeling relieved.The utility model Ni Zhifu drill also can be made the improvement of the third aspect on the improved basis of above-mentioned first aspect, durability with further this drill bit of raising, can reduce outside sharp angle 2 φ for this reason, make them between 121 °-123 °, thereby can improve the radiating condition at 33 places, outside outer end, prolong drilling life of bit.

Certainly, the utility model Ni Zhifu drill also can make improvements simultaneously to above-mentioned three aspects, and such Ni Zhifu drill both can carry out mechanical sharpening, has improved apex point centering ability and drill bit durability again.

The utility model is the improved while aspect making above-mentioned three, also can do expansion and adjustment to the grinding parameter of 67 formula Ni Zhifu drills, wherein, and sharp high h=0.035d-0.045d, the long b of chisel edge _ψ=0.035d-0.045d, outer edge clearance angle α _Fc=8 °-14 °, circular arc relief angle α _Rc=10 °-16 °, inner edge oblique angle τ=20 °-30 °, interior angle of cutting edge γ _{τ c}-10-15 °.

How Fig. 5 and Fig. 6 have illustrated with emery wheel the back knife face of the utility model Ni Zhifu drill have been carried out mechanical sharpening, according to circular arc relief angle α _Rc, chisel edge angle ψ, inner edge sharp angle 2 φ _τSize and the requirement of the long L of outside, adjust the installation location of drill bit at cutter grinding machine, utilize the fillet (anchor ring) and the transverse plane of emery wheel, come knife face (being the back knife face of circular arc sword, inner edge, chisel edge) 34 behind the crescent of sharpening drill bit.

How Fig. 7 has illustrated with emery wheel the inner edge rake face of the utility model Ni Zhifu drill has been carried out mechanical sharpening, according to inner edge sharp angle 2 φ _τ, inner edge oblique angle τ and interior angle of cutting edge γ _{τ c}Size, adjust the installation location of drill bit at cutter grinding machine, utilize the fillet (anchor ring) of emery wheel and transverse plane and periphery to come the inner edge rake face 35 of sharpening drill bit.

When the utility model Ni Zhifu drill that adopts aforesaid way to V-arrangement chip dividing groove with band circular arc-shaped bottom portion and corresponding arc radius R carries out mechanical sharpening, just can adapt to the requirement of industrial large-scale production.

More than the specific embodiment of the present utility model is described; but the utility model is not limited to aforesaid way; the V-arrangement chip dividing groove of every employing band circular arc-shaped bottom portion and the arc radius R of circular arc sword are the Ni Zhifu drill of 0.11-0.15 with the ratio of bit diameter d, all drop within the protection domain of the present utility model.

Claims

1. Multi-tip and edge Ni Zhifu drill, comprise apex point part and targeting part, two main cutting edges of this apex point part ecto-entad respectively are divided into outside (27), (29) three sections of circular arc sword (28) and inner edges, it between two inner edges (29) chisel edge (31) that is positioned at the apex point centre, form seven swords, this two outside (27) intersects formation two arc blade tips (25) with two circular arc swords (28), the inner of two circular arc swords (28) is connected with the outer end of two inner edges (29) is slick and sly, chisel edge (31) between two inner edges (29) becomes the unbearable point (24) in this apex point centre, and forming with unbearable point (24) is the center, two arc blade tip (25) symmetries are positioned at the tricuspid of its both sides; On the back knife face (32) of apex point part one side outside (27), grind chip dividing groove (22), thereby in the outside (27) of this side, form a branch bits sword (30) again, the outside (27) of this branch bits swords (30) and this side intersects and forms two branches bits blade tips (26) again, it is characterized in that: the arc radius R of this circular arc sword (28) is 0.11-0.15 with the ratio of this bit diameter d, and this chip dividing groove (22) is that cross section is the vee-cut that has circular arc-shaped bottom portion.

2. Ni Zhifu drill according to claim 1 is characterized in that: this sidewall angle that has the V-arrangement chip dividing groove (22) of circular arc-shaped bottom portion is 90 °.

3. Ni Zhifu drill according to claim 1 is characterized in that: inner edge sharp angle 2 φ of this inner edge (29) _τIt is 131 °-133 °.

4. according to any one described Ni Zhifu drill in the claim 1 to 3, it is characterized in that: the oblique angle ψ of this chisel edge (31) is 65 °＜ψ≤70 °.

5. according to any one described Ni Zhifu drill in the claim 1 to 3, it is characterized in that: outside sharp angle 2 φ of this outside (27) are 121 °-123 °.

6. Ni Zhifu drill according to claim 5 is characterized in that: the oblique angle ψ of this chisel edge (31) is 65 °＜ψ≤70 °.