CN103273121A

CN103273121A - Twist drill with high cutting performance

Info

Publication number: CN103273121A
Application number: CN2013102515277A
Authority: CN
Inventors: 张建华
Original assignee: JIANGSU FEIDA DRILLS CO Ltd
Current assignee: JIANGSU FEIDA DRILLS CO Ltd
Priority date: 2013-06-24
Filing date: 2013-06-24
Publication date: 2013-09-04

Abstract

A twist drill with a high cutting performance comprises a working portion and a handle. The outer diameter of the twist drill is d, and the working portion comprises a guide portion and a cutting portion, wherein the guide portion comprises a helical groove and a drilling core. The twist drill is characterized in that the increment delta K of the drilling core is 5.5-6.5mm/100mm, and the helical angle omega of the helical groove is 36-40 degrees. By the aid of the large helical angle omega of the groove, the front angle of a main cutting edge of a drill bit is increased, and a cutting edge is sharper. In the use process, the twist drill has fine strength and rigidity, the normal section of the helical groove has large circular arc transition (non-working side), the chip space of a drilled hole is enlarged, cooling liquid more easily permeates the drilled hole, and chips are more smoothly removed.

Description

A kind of fluted drill with high cutting ability

Technical field

The invention belongs to the metal cutting tool technology, relate to a kind of fluted drill with high cutting ability.

Background technology

At the fluted drill that all kinds of part borings are used, be a kind of very economical practicality, adaptable cutting tool.The common brill core of standard fluted drill working portion increment less (1.4～2.0/100), helix angle of gash is less (26 °～30 °) also, (inoperative side) do not have arc transition in the spiral grooves normal section simultaneously, fluted drill work rigidity, cutting edge sharpness, chip resistance are not fine like this, finally can cause fluted drill cutting ability difference and service life short.

Summary of the invention

At above problem, the object of the present invention is to provide a kind of fluted drill with high cutting ability, make working portion wammel core increment, big helix angle of gash, and in the spiral grooves normal section, be provided with the fluted drill than orthodrome transition (inoperative side), make cutting edge sharper; The boring chip removal is more smooth.

Technical scheme of the present invention realizes in the following manner: a kind of fluted drill with high cutting ability, formed by working portion and shank, the external diameter of fluted drill is d, working portion is by being made up of targeting part and cutting tip, wherein: targeting part is made up of spiral grooves and brill core, and it is characterized in that: the increment △ K of described brill core is that the helical angle ω of 5.5～6.5mm/100 mm, spiral grooves is 36 °～40 °.

The normal section of described spiral grooves is provided with arc transition: R=0.2～3.0 mm.

The present invention, groove large helix angle ω make drill bit main cutting edge anterior angle increase, and cutting edge is more sharp; Wammel core increment makes product have intensity, rigidity preferably in use; The spiral grooves normal section is provided with than orthodrome transition (inoperative side), makes the boring chip space increase, the easier infiltration of cooling fluid, and chip removal is more smooth.

Description of drawings

Fig. 1 is structural representation of the present invention.

Fig. 2 is the schematic diagram that bores core thickness increment △ K.

Fig. 3 is the normal cross sectional drawing of spiral grooves.

The specific embodiment

Known that by Fig. 1 a kind of fluted drill with high cutting ability is made up of working portion and shank, the external diameter of fluted drill is d, and working portion is formed by boring core and spiral grooves.

Being known by Fig. 2, is the schematic diagram that bores core thickness increment △ K.The increment △ K that bores core is that the helical angle ω of (5.5～6.5) mm/100, spiral grooves is 36 °～40 °.

Being known by Fig. 3, is the normal cross sectional drawing of spiral grooves.The normal section of spiral grooves is provided with arc transition: R=0.2～3.0mm.

The present invention, 1, bore core (thickness) increment △ K:(5.5～6.5)/to bore core (thickness) increment be (1.4～2.0)/100 to 100(standard fluted drill); 2, helix angle of gash ω: 36 °～40 ° (standard fluted drill helix angle of gash is (26 °～30 °); 3, spiral grooves normal section (inoperative side) is provided with that (inoperative side) do not have arc transition in arc transition: R=0.2～3.0(standard fluted drill spiral grooves normal section); 4, wammel core (thickness) increment △ K(5.5～6.5)/100.Make its product have higher intensity and rigidity in use;

5, groove large helix angle ω (36 °～40 °) makes drill bit main cutting edge anterior angle increase, and cutting edge is more sharp; 6, the spiral grooves normal section is provided with than orthodrome transition (inoperative side), makes the boring chip space increase, the easier infiltration of cooling fluid, and chip removal is more smooth.

Embodiment one:

With the high-speed steel bar of same production batch W6Mo5Cr4V2, Ф 8.60, produce Ф 8.0 specification fluted drill A samples and B sample (both Technologies for Heating Processing are identical), (A sample: with the fluted drill of the present invention's production; B sample: with the fluted drill of standard production) concrete parameter is as follows:

Test method: with TK7640 type digital control vertical boring and milling machine, cutting speed: 28m/min, amount of feeding 0.20mm/r, drilling degree of depth 24mm.Cutting examination base: 40Cr Ф 320*30 modifier treatment, hardness HB210～216.The drilling blind hole is with the cooling of the oil emulsion aqueous solution.Its function life-span result of the test sees Table 1, table 2.

Table 1(A sample test specimen boring result)

1#	2#	3#	4#	5#	6#	7#	8#	9#	10#	Add up to	Average
												243	296	382	383	472	275	292	415	268	295	3411	?

Table 2(B sample test specimen boring result)

1#	2#	3#	4#	5#	6#	7#	8#	9#	10#	Add up to	Average
												125	112	141	191	98	132	92	116	196	147	1350	?

Embodiment two:

With the high-speed steel bar of same production batch W9Mo3Cr4V, Ф 5.5, produce Ф 5.0 specification straight shank twist drill A samples and B sample (Technology for Heating Processing is identical), (A sample: with the fluted drill of the present invention's production; B sample: with the fluted drill of standard production) concrete parameter is as follows:

Figure 2013102515277100002DEST_PATH_IMAGE004

Test method: with TK7640 type digital control vertical boring and milling machine, cutting speed: 28m/min, amount of feeding 0.15mm/r, drilling degree of depth 15mm.Cutting examination base: 40Cr Ф 300*30 modifier treatment, hardness HB212～218.The drilling blind hole is with the cooling of the oil emulsion aqueous solution.Its result of the test sees Table 3, table 4.

Table 3(A sample test specimen boring result)

1#	2#	3#	4#	5#	6#	7#	8#	9#	10#	Add up to	Average
												945	702	829	593	853	775	865	628	908	959	8057	?

Table 4(B sample test specimen boring result)

1#	2#	3#	4#	5#	6#	7#	8#	9#	10#	Add up to	Average
												327	380	299	407	227	249	382	248	305	282	3106	?

Claims

1. fluted drill with high cutting ability, formed by working portion and shank, the external diameter of fluted drill is d, working portion is by being made up of targeting part and cutting tip, wherein: targeting part is made up of spiral grooves and brill core, and it is characterized in that: the increment △ K of described brill core is that the helical angle ω of 5.5～6.5mm/100 mm, spiral grooves is 36 °～40 °.

2. a kind of fluted drill with high cutting ability according to claim 1, it is characterized in that: the normal section of described spiral grooves is provided with arc transition: R=0.2～3.0 mm.