CN2039239U

CN2039239U - Combined deep-hole drill

Info

Publication number: CN2039239U
Application number: CN 88220815
Authority: CN
Inventors: 秦新毓; 刘晓球
Original assignee: JIANGXI MEASURING AND CUTTING
Current assignee: JIANGXI MEASURING AND CUTTING
Priority date: 1988-12-09
Filing date: 1988-12-09
Publication date: 1989-06-14

Abstract

The utility model provides a composite deep-hole drill having an improved structure, which is characterized in that a shape of a spiral groove is formed by parabolic types and circular arc line types via rotation, no back edge is arranged, a chip flute is wide, and a drill core having a large helix angle without taper is utilized. A drill tip uses cross grinding method for correction, cutting scraps are in the shape of a ribbon, scraps can be discharged fluently, processing efficiency is increased, and the durability of a cutter is also enhanced. The utility model is suitable for processing hard alloy materials and other kinds of metal which are difficult to process.

Description

Combined deep-hole drill

The utility model is the architecture advances of common compound brill, also is the combination that the applicant has applied for two utility models.Those two utility models are: 1. depth twist drill (88204129.0), 2. a novel reamer (88204128.2).

Adopt the cutter of same process to composite holes processing, compound brill and the compound brill of four seamed edges that the transformation of the way of standard fluted drill is arranged now commonly used, the compound brill of the standard fluted drill transformation of the way does not have independently cutter tooth and chip area, the easy phase mutual interference of smear metal, chip pocket float bits difficulty, creep into 2～3 times of apertures dark after, just need griffe chip removal, an i.e. feed draw ratio less (having only 2～3), drill bit poor rigidity, frangibility, the length of small diameter portion (i.e. boring section) and ratio≤3 of its diameter, machining accuracy is poor, and the compound drilling of four seamed edges such as uses at the helical pitch design, and helical angle does not wait, interfere phenomenon when milling chip area, though independently cutter tooth and chip area are arranged, smear metal is difficult for interfering, because chip pocket is little, chip removal is still difficult, need frequently griffe chip removal, drill bit poor rigidity, the length and its diameter ratio≤3 of boring section.

The purpose of this utility model is to provide the compound brill of a kind of simple in structure, boring section draw ratio big (can reach 15), a feed draw ratio big (can reach 20).

Key problem in technology of the present utility model is: the helicla flute grooved of drill bit is formed by parabolic type and the rotation of circular arc line style, and adopts the thick brill core of zero draft.Because parabola has the characteristic that the ray of its different directions of directive is reflected into the straight line that is parallel to each other, thereby in drilling process, flow direction from smear metal, smear metal be in line shape, distortion is for the ribbon shape slightly, adopt the brill core of zero draft in addition, the axial resistance of chip removal is reduced, and one time the feed draw ratio can reach 20.Thick brill core good rigidly prevents that self-excited vibration is to improve machining accuracy.

The utility model is described in further detail below in conjunction with drawings and Examples.

Fig. 1 is the utility model structure diagram

Fig. 2 is the local longitudinal sectional drawing of the utility model

Fig. 3 is the axial B-B profile of the utility model

Fig. 4 is the utility model apex point cross reconditioning structure chart

Fig. 5 is the utility model normal direction A-A profile

Compound depth drill is made up of boring section 1 and reaming L section, comprises apex point, cutting edge, brill core, helicla flute (1 section helixangle ₁, L section helixangle ₂), part such as drillstock (Fig. 1).The helicla flute flute profile forms (Fig. 3, Fig. 5) by parabolic type and the rotation of circular arc line style, and 1,3 is parabolic type among the figure, and 2,4 is the circular arc line style, during drilling, makes smear metal be the ribbon shape.Brill core of the present utility model thicker (Fig. 2).Bore the thick K of core when large and small diameter is close, K=(0.4～0.6) D; When large and small diameter differs big, K=(0.4～0.6) (D+d)/2.On flute length (L+1), bore the core zero draft.Because it is thick to bore core, apex point needs reconditioning, adopts cross reconditioning method (Fig. 4), makes the long W=0.08 of chisel edge～0.25 millimeter, chisel edge anterior angle γ ₄=3 °～8 °, chisel edge angle ψ=25 °, drift angle 2 φ=135 ° ± 3 °.Because chisel edge is little, and good centering effect is arranged, the chisel edge anterior angle is a positive angle, and cutting load is more even.The utility model does not have land, so chip pocket is wide, bores core in addition and is not with tapering, so the chip removal resistance is little.The utility model adopts large helix angle, boring section helixangle ₁With reaming section helixangle ₂Equate β ₁=β ₂=36 °～40 °, so the drilling anterior angle is big, cut sharply, cutting deformation is little.Since adopt thick brill core, good rigidly, the length of boring section can increase, and draw ratio can reach 15.

Advantage of the present utility model:

1, the efficient of composite holes processing improves 2～3 times than existing composite drill.

2, tool life improves 2～3 times than existing composite drill.

3, harder alloy material and other the unmanageable metal of suitable processing.

Claims

1, a kind of compound depth drill is made up of boring section and reaming section, comprises parts such as apex point, cutting edge, brill core, helicla flute, drillstock, it is characterized in that, the helicla flute flute profile is formed by parabolic type and the rotation of circular arc line style, and it is thick to bore core, and is not with tapering.

2, compound depth drill according to claim 1 is characterized in that boring section helixangle ₁With reaming section helixangle ₂Equate, be 36 °～40 °.

3, compound depth drill according to claim 1 and 2 is characterized in that, apex point is through the correction of cross reconditioning method, the long W=0.08 of chisel edge～0.25 millimeter, chisel edge anterior angle γ ₄=3 °～8 °, chisel edge angle ψ=25 °, drift angle 2 φ=135 ° ± 3 °.