CN1074155A

CN1074155A - Spiral bit

Info

Publication number: CN1074155A
Application number: CN 92100045
Authority: CN
Inventors: 陈章燕; 贺士起
Original assignee: BEIJING HOISTING MACHINERY PLANT
Current assignee: BEIJING HOISTING MACHINERY PLANT
Priority date: 1992-01-09
Filing date: 1992-01-09
Publication date: 1993-07-14

Abstract

A kind of spiral bit belongs to the drilling tool that solid material is processed usefulness.The invention is characterized in: its " five sharp nine swords " large-scale fluted drill of formula that is a kind of, it respectively has a pair of outside, the first circular arc sword, the second circular arc sword and interior blade, is distributed in the and arranged on left and right sides of drill bit from outside to inside successively, and the centre is narrow chisel edge.Bit diameter can be chosen between Φ 40mm～Φ 80mm.Compare with Ni Zhifu drill, as long as select suitable drilling speed and feed, branch is considered to be worth doing, chip removal is very smooth and easy.Its fines width is no more than 10mm, and the durability of drill bit can improve 2～3 times.

Description

Spiral bit

A kind of spiral bit belongs to the drilling tool that solid material is processed.

When solid material is holed, if the Ni Zhifu drill of Ni Zhifu invention between φ 8mm～φ 40mm, just can be adopted in the aperture, can process according to the cutting data that provides at present, its speed is fast, the chip removal smoothness, and bit wear is little.But when processing aperture between φ 40mm～φ 80mm the time, during as φ=70mm, if use d ₀The medium-sized fluted drill processing of=40mm, efficient is very low.If use diameter d ₀After the large-scale spiral bit of=65mm is once holed, again with depth of cut a _p=2.5mm carries out half right boring hole, and when 58mm was arrived in the overstriking of boring bar diameter, though its feed can improve greatly, branch was considered to be worth doing, chip removal is very obstructed, and seamed edge corner serious wear, production efficiency are also very low.

It is 40mm～80mm that purpose of the present invention will provide a kind of processing aperture exactly, divide bits, chip removal smoothness, production efficiency height, the durable again large-scale spiral bit of cutting edge peak profit.

In order to reach the foregoing invention purpose, the invention provides the large-scale spiral bit of a kind of " five sharp nine swords " formula, it is characterized in that: it has left and right two outsides, left and right two first circular arc swords, left and right two second circular arc swords, left and right two interior blades and a narrow chisel edge, the diameter d of drill bit ₀Can between 40mm～80mm, change.

Use proof: selecting suitable drilling speed V ₀Under the condition of feed f, and also can fully be cooled off adding the man-hour drill bit at full capacity, then chip removal situation is greatly improved, and blade is sharp, and its durability can improve more than 2～3 times.

In order in conjunction with the embodiments the present invention to be done more detailed description below, now as follows employed accompanying drawing title of present specification and numbering brief introduction:

The longtitudinal view of Fig. 1, spiral bit Ni Zhifu drill;

The horizontal view of Fig. 2, spiral bit Ni Zhifu drill;

The longtitudinal view of Fig. 3, " five sharp nine swords " formula spiral bit;

The horizontal view of Fig. 4, " five sharp nine swords " formula spiral bit.

Embodiment

Ask for an interview Fig. 1～2.It has straight sword in three outer straight swords, two circular arc swords and two, total " tricuspid seven swords ".As long as open a sword, just " five sharp nine swords " formula drill bit of pie graph 3～4 on this basis again.Make the chisel edge anterior angle be increased to-30 ° by-60 ° again, promptly rise in value 30 °, 1 ° of every increment just can make drill thrust descend 1%.In Fig. 3～4, AB and A ' B ' are left and right two outsides, and BC and B ' C ' are left and right two first circular arc swords, and CD and C ' D ' are left and right two second circular arc swords, and DE and D ' E ' are left and right two interior blades, and EE ' is chisel edge width b _ψ, narrow chisel edge equals (b ψ)/5.Its three sharp angle 2 φ, 2 φ ₁With 2 φ ₂Between increase progressively 5 ° mutually successively, i.e. 2 φ ₁=2 φ+5 °, 2 φ ₂=2 φ ₁+ 5 °.The relief angle α R of its two circular arc swords ₁N=α R ₂N, and all between 12 °～18 °.The arc radius R of its two circular arc swords ₁=R ₂, and all equal 0.08d ₀, d ₀Be bit diameter, between 40mm～80mm, select for use.Its outer edge clearance angle α _f=16 °, chisel edge angle ψ=65 °, chisel edge anterior angle r _ψBe-30 °, chisel edge width b _ψ=0.023d., narrow chisel edge width is 1/5 b _ψ, interior blade oblique angle is τ=25 °, the high h of two points ₁=h ₂, and all equal 0.023d ₀

In the present embodiment, processed aperture is φ 70mm, selects d ₀=65mm, its b _ψ=7.5mm, narrow chisel edge is wide to be 1.5mm, 2 φ=125 °, 2 φ ₁=130 °, 2 φ ₂=135 °, R ₁N=R ₂N=18 °, R ₁=R ₂=5.20mm, h ₁=h ₂=1.5mm, drilling speed is 29 meters/minute, feed is 0.24 millimeter/commentaries on classics, its each bore ditch and just discharge four fines, width is all below 10mm, and the scurf width of being discharged when using Ni Zhifu drill is more than or equal to 15mm～18mm, the chip removal situation is greatly improved, and durability has improved three times.If make α R ₁N=α R ₂In the time of n=12 °, its effect is similar, does not have obviously different.If it is also same when 12 °～18 ° intermediate values.

Claims

1, a kind of spiral bit, it is made of blade and point of a knife, the invention is characterized in, it is a kind of have left and right two outside AB and A ' B ', " five sharp nine swords " large-scale spiral bit of formula of left and right two first circular arc sword BC and B ' C ', left and right two second circular arc sword CD and C ' D ', left and right two interior blade DE and a D ' E ' and a narrow chisel edge, its bit diameter d ₀Can between 40mm～80mm, change.

2, spiral bit according to claim 1 is characterized in that, its three sharp angle 2 φ, 2 φ ₁With 2 φ ₂Between increase progressively 5 ° mutually successively, i.e. 2 φ ₁=2 φ+5 °, 2 φ ₂=2 φ ₁+ 5 °.

3, spiral bit according to claim 2 is characterized in that, the relief angle of its two circular arc swords is equal, i.e. α R ₁N=α R ₂N, and all between 12 °～18 °.

4, spiral bit according to claim 1 is characterized in that, the arc radius of its two circular arc swords is equal, i.e. R ₁=R ₂, and all equal 0.08d ₀

5, spiral bit according to claim 1 is characterized in that, its outer edge clearance angle α _f=16 °.

6, spiral bit according to claim 1 is characterized in that, its chisel edge angle ψ=65 °, chisel edge anterior angle r _ψBe-30 °.

7, spiral bit according to claim 1 is characterized in that, its chisel edge width b _ψ=0.023d ₀, narrow chisel edge width is (b ψ)/5.

8, according to the spiral bit of claim 1, it is characterized in that its interior blade oblique angle τ=25 °.

9, spiral bit according to claim 1 is characterized in that, its high equating of two points, i.e. h ₁=h ₂, and all equal 0.023d ₀