CN206263306U - It is a kind of to improve the apex point that alloy bores chip-breaking performance - Google Patents

Abstract

Improve the apex point that alloy bores chip-breaking performance the utility model discloses a kind of, including knife face after two symmetrical main cutting edges, two, it is characterized in that knife face is plane after major first flank, second, inner edge is connected between two main cutting edges, described 45 ° of inner edge oblique angle τ ＞, the chip for forming inner edge, main cutting edge is individually separated.In drilling process, the chip for promoting inner edge, main cutting edge to be formed constantly is separated, and chip breaking is made to aggravate chip deformation curling, avoid chip removal not smooth, iron filings long are wrapped in the various adverse consequences caused by the first-class phenomenon of cutter, drill bit intensity stabilization, long service life.

Description

It is a kind of to improve the apex point that alloy bores chip-breaking performance

Technical field

The utility model is related to drill bit capable of machining hole technology, especially a kind of to improve the apex point that alloy bores chip-breaking performance.

Background technology

Fluted drill is one of hole machined instrument the most frequently used during industry is manufactured, since fluted drill invention, its thematic structure It is essentially unchanged, and being directed to different materials, the design parameter of different processing requests has various designs and change, its purpose effect is not One.As patent publication No. be CN105033329A, a kind of fluted drill for difficult processing chip breaking material, cutter hub and shank are with same Coaxial clyinder centered on one central axis, has ground helical form chip area on cutter hub, the entity part outside chip area is The knife back, the endface position mill of cutter head body has rear knife face, and rear knife face forms main cutting edge with the intersection of chip area, and cutter hub forms row Bits portion and the blade being connected with it, main cutting edge include the first drift angle section, transition circle segmental arc and the second drift angle being connected successively Section.This structure is designed with the Double Tops angle of small drift angle using big drift angle, makes iron filings by deforming twice, reaches the effect of chip breaking Really.A kind of chip breaking fluted drill that and for example patent publication No. is designed for CN104942345A, including two of fluted drill cutting blade surfaces With two non-cutting flute faces, symmetrical filings-breaking surface is added respectively in the position in each non-cutting flute face, two filings-breaking surfaces are Spiral finned surface with step, there is the step rib for crimping cutting in cutting blade surface with the inner side root of the tail portion of the spiral finned surface of step Face.This structure is mainly on ditch design is bored, and the spiral finned surface of step is added in drill bit non-cutting flute face.

The content of the invention

The purpose of this utility model primarily to solve a kind of American Standard cast steel trade mark LCB, because its elongation percentage is high, using existing Chip removal chip breaking is difficult when having solid carbide twist drill to be drilled, and chip removal is not smooth, iron filings long are wrapped on cutter, causes easily The problems such as damaging cutter, workpiece, and jeopardize operating personnel's safety, or even chip is cleared up by forced-stopping machine, there is provided one kind improves closes Gold bores the apex point of chip-breaking performance.

Above-mentioned technical problem of the present utility model is mainly what is be addressed by following technical proposals：One kind improves alloy The apex point of chip-breaking performance is bored, including symmetrical two main cutting edges, knife face after two, it is characterized in that major first flank, the Knife face is plane after two, connects inner edge between two main cutting edges, described 45 ° of inner edge oblique angle τ ＞, makes inner edge, main cutting Tooth shape into chip be individually separated.The service efficiency that chip processes the bad Digit Control Machine Tool for high degree of automation is extremely not Profit.American Standard cast steel trade mark LCB tensile strength is 450~620MP, yield strength >=240MP, elongation percentage >=24%, Brinell hardness HB 150~200, three sample block average value >=18J of Charpy-type test v-notch ballistic work, the technical program are directed to this spy Different material situation is designed, and using typical four planes alloy fluted drill, i.e., knife face is equal after the first, second of main cutting edge It is plane, the size of this type alloy fluted drill chisel edge angle τ, to changing chip deformation amount of crimp important, is main The factor of chip breaking is influenceed, chisel edge is by becoming inner edge after the change of this programme, the chisel edge of existing alloy fluted drill is oblique Angle τ is generally 45 °, and in the case of other cutting parameters for limiting, alloy bores chisel edge, the chip of main cutting edge formation and do not divide Open, chip deformation is not enough, is not easily broken；When inner edge oblique angle τ is increased, the chip for forming inner edge, main cutting edge is separated, and is thus added Acute chip deformation curling is so that chip breaking.

Preferably, two described main cutting edges are parallel to each other.

Preferably, described apex point drift angle is φ：φ=140°±5°.Larger drift angle makes drill bit have higher squeezing Compressive Strength.

Preferably, described alloy bores cutting parameter meeting：Rotating speed Vc≤120r/min, amount of feeding fn≤0.5mm.Close The cutting parameter of reason ensure that the normal work and use life-span of drill bit.

The beneficial effects of the utility model are：Inner edge oblique angle τ is changed according to special substance requirement, in drilling processing During, the chip for promoting inner edge, main cutting edge to be formed constantly is separated, and chip breaking is made to aggravate chip deformation curling, is kept away Exempt from that chip removal is not smooth, iron filings long are wrapped in the various adverse consequences caused by the first-class phenomenon of cutter, and drill bit intensity stabilization uses the longevity Life length.

Brief description of the drawings

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

Fig. 2 is the left view structural representation of the utility model Fig. 1.

In figure：1. drillstock, 2. drill bit, 21. major first flanks, knife face after 22. second, 23. inner edges, 24. masters cut Cut sword.

Specific embodiment

Below by embodiment, and with reference to accompanying drawing, the technical solution of the utility model is described in further detail.

The present embodiment is a kind of to improve the apex point that alloy bores chip-breaking performance, and referring to Fig. 1, whole branch fluted drill includes drillstock 1 and bores First 2, apex point drift angle φ=140 °；The apex point of drill bit 2 has two and is parallel to each other and with two symmetrical main cuttings of center line Sword 24, as shown in Fig. 2 each knife face after tool one of two main cutting edges 24, after knife face is major first flank 21 and second after two Knife face 22 is planar structure, is the inner edge 23 being connected with each other with central point between two main cutting edges 24, and inner edge oblique angle τ is 55 °, thus, the chip for forming inner edge 23 and main cutting edge 24 is individually separated, so as to aggravate chip deformation curling, chip is existed Regularly fractureed in the swing circle of drill bit 2.The fluted drill of an a diameter of 14mm is selected to be tested, in cutting parameter rotating speed Vc It is that 90r/min, amount of feeding fn are considered to be worth doing under the conditions of 0.3mm, iron filings are last in typical c-type, length is typically in 5~8mm, and chip removal is suitable Freely.

Above-described embodiment be to explanation of the present utility model, be not to restriction of the present utility model, it is any new to this practicality Structure after the simple transformation of type belongs to protection domain of the present utility model.

Claims (4)

1. it is a kind of to improve the apex point that alloy bores chip-breaking performance, including two symmetrical main cutting edges（24）, knife face after two, It is characterized in that major first flank（21）, knife face after second（22）Plane is, inner edge is connected between two main cutting edges（23）, institute 45 ° of the inner edge oblique angle τ ＞ for stating, the chip for forming inner edge, main cutting edge is individually separated.

2. a kind of improvement alloy according to claim 1 bores the apex point of chip-breaking performance, it is characterized in that two described masters cut Sword is cut to be parallel to each other.

3. it is according to claim 1 and 2 a kind of to improve the apex point that alloy bores chip-breaking performance, it is characterised in that apex point drift angle is φ：φ=140°±5°.

4. a kind of improvement alloy according to claim 1 and 2 bores the apex point of chip-breaking performance, it is characterised in that alloy drilling is cut Parameter meets：Rotating speed Vc≤120r/min, amount of feeding fn≤0.5mm.