CN203426506U

CN203426506U - Twist drill having high cutting performance

Info

Publication number: CN203426506U
Application number: CN201320362296.2U
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: 2014-02-12
Anticipated expiration: 2023-06-24

Abstract

A twist drill having high cutting performance consists of a working part and a handle part, the external diameter of the twist drill is d, the working part consists of a guiding part and a cutting part, wherein the guiding part consists of a spiral groove and a drill core, and the twist drill is characterized in that an increment [delta]K of the drill core is 5.5 to 6.5mm/100mm, and the helical angle omega of the spiral groove is 36 to 40 degrees. According to the twist drill, the large helical angle omega of the groove enables the front angle of a main cutting edge of a drill bit to be enlarged, and the cutting edge is more sharp; the product has relatively good strength and rigidity in the process of using; and a normal section of the spiral groove is provided with relatively large circular arc transition (non-working side), the space for accommodating chips in a drill hole is enlarged, cooling liquid is more easy to permeate, and chip removal is more smooth.

Description

A kind of fluted drill with high cutting ability

Technical field

The utility model belongs to metal cutting tool technology, relates to a kind of fluted drill with high cutting ability.

Background technology

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

Summary of the invention

For above problem, the purpose of this utility model is to provide a kind of fluted drill with high cutting ability, make working portion wammel core increment, large helix angle of gash, and in spiral grooves normal section, be provided with compared with the fluted drill of orthodrome transition (inoperative side), make cutting edge sharper; Boring chip removal is more smooth.

The technical solution of the utility model is achieved in the following ways: a kind of fluted drill with high cutting ability, by working portion and shank, formed, the external diameter of fluted drill is d, working portion is by being comprised of targeting part and cutting tip, wherein: targeting part is comprised of spiral grooves and brill core, 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: its radius R=0.2～3.0 mm.

The utility model, groove large helix angle ω increases drill bit main cutting edge anterior angle, and cutting edge is more sharp; Wammel core increment makes product have good intensity, rigidity in use procedure; Spiral grooves normal section is provided with compared with orthodrome transition (inoperative side), and the chip space that makes to hole increases, and cooling fluid is more easily permeated, and chip removal is more smooth.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model.

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

By Fig. 1, known, a kind of fluted drill with high cutting ability, is comprised of working portion and shank, and the external diameter of fluted drill is d, and working portion is by boring core and spiral grooves forms.

By Fig. 2, being known, 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 °.

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

The utility model, 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 arc transition: in its radius R=0.2～3.0(standard fluted drill spiral grooves normal section, (inoperative side) do not have arc transition); 4, wammel core (thickness) increment △ K(5.5～6.5)/100.Make its product there is higher intensity and rigidity in use procedure;

5, groove large helix angle ω (36 °～40 °), increases drill bit main cutting edge anterior angle, and cutting edge is more sharp; 6, spiral grooves normal section is provided with compared with orthodrome transition (inoperative side), and the chip space that makes to hole increases, and cooling fluid is more easily permeated, and chip removal is more smooth.

Embodiment mono-:

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: the fluted drill of producing with the utility model; B sample: with the fluted drill of standard production) design parameter is as follows:

Test method: with TK7640 type numerical control vertical type boring-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.Drilling blind hole, cooling with the oil emulsion aqueous solution.Its function life-span result of the test in 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 bis-:

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: the fluted drill of producing with the utility model; B sample: with the fluted drill of standard production) design parameter is as follows:

Test method: with TK7640 type numerical control vertical type boring-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.Drilling blind hole, cooling with the oil emulsion aqueous solution.Its result of the test in 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. a fluted drill with high cutting ability, by working portion and shank, formed, the external diameter of fluted drill is d, working portion is by being comprised of targeting part and cutting tip, wherein: targeting part is comprised of spiral grooves and brill core, 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, is characterized in that: the normal section of described spiral grooves is provided with arc transition angle, its radius R=0.2～3.0 mm.