CN203091813U

CN203091813U - Hard alloy twist drill

Info

Publication number: CN203091813U
Application number: CN 201320076668
Authority: CN
Inventors: 刘将先
Original assignee: Dongfeng Peugeot Citroen Automobile Co Ltd
Current assignee: Dongfeng Peugeot Citroen Automobile Co Ltd
Priority date: 2013-02-19
Filing date: 2013-02-19
Publication date: 2013-07-31
Anticipated expiration: 2023-02-19

Abstract

The utility model relates to the field of machine tool machining cutters, in particular to a hard alloy twist drill which comprises a handle part and a working part. Two inner-cooling holes which are in central symmetry are formed inside the working part in the axial direction. A drilled core of the working part comprises two sections, the diameter of a drilled core at the first section close to the handle part is smaller than that of a drilled core at the second section far away from the handle part, and the drilled core at the first section and the drilled core at the second section are in a smooth transition. According to the hard alloy twist drill, on the basis of an existing twist drill, a drilled core form is optimized, the drilled core of the twist drill is divided into two sections which are in the smooth transition, and the structure is simple. The rigidity and strength of the twist drill are guaranteed, and meanwhile, the smooth chip removing process can be effectively guaranteed.

Description

Hard alloy twist drill

Technical field

The utility model relates to a kind of machine tooling cutter field, is specifically related to a kind of hard alloy twist drill.

Background technology

The cutter of machining crankshafts oil hole commonly used is deep hole hard alloy twist drill or drill gun, use the processing of cutting fluid wet type, it in use has certain shortcoming, as the chip removal difficulty, after cutter creeps into certain depth, just need griffe chip removal, promptly a depth of cut is little, need frequently to griffe chip removal in drilling process, hard alloy twist drill commonly used is as using at the MQL(micro lubricating) and the situation of high cutting parameter (S4247 F1247) under result of use very poor, efficient is low, the life-span is low.

Summary of the invention

The purpose of this utility model is exactly in order to solve the deficiency that the above-mentioned background technology exists, a kind of hard alloy twist drill to be provided.

The technical solution adopted in the utility model is: a kind of hard alloy twist drill, comprise shank and operate portions, the inside of operate portions offers cold hole in two with the center symmetry vertically, the brill core of described operate portions comprises two sections, less than second section diameter that bores core away from shank, first section is bored rounding off between core and the second section brill core near first section of shank diameter that bores core.First section brill core diameter near shank reduces, and the volume of corresponding spirality chip area increases, and just can not cause smear metal to be piled up, and helps the smear metal discharge.

The utility model has been optimized brill core form on the basis of existing fluted drill, the brill core of fluted drill is divided into two sections, and two sections are bored rounding off between the cores, simple in structure, when guaranteeing the fluted drill stiffness and strength, can guarantee effectively that chip removal is smooth and easy, improve stock-removing efficiency.

Description of drawings

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

Fig. 2 is that A-A among Fig. 1 is to profile.

Fig. 3 is that B-B among Fig. 1 is to profile.

The specific embodiment

The utility model is described in further detail below in conjunction with the drawings and specific embodiments, is convenient to be well understood to the utility model, but they do not constitute qualification to the utility model.

As Figure 1-3, the utility model comprises shank 1 and operate portions 2, and the inside of operate portions 2 offers cold hole 5 in two with the center symmetry vertically.In the diameter in cold hole 5 increased to 0.8mm by existing 0.6mm, and the centre-to-centre spacing in interior cold hole is increased to 3.1mm by 2.6mm, helps whole section cutting edge, and is especially best to the cutting edge cooling effect near the cylindrical place, the service life that can increase fluted drill.The brill core of operate portions 2 comprises two sections, and less than second section diameter that bores core 4 away from shank, first section is bored rounding off, i.e. changeover portion L3 between core 3 and the second section brill core 4 near first section of shank diameter that bores core 3.Second section is bored core 4 diameter phi 2 is 2.1 ± 0.04mm, and length L 2 is 34mm; All the other segment length L1 are that 3, the first sections brills of first section brill core core, 3 diameter phi 1 are 1.81 ± 0.04m, less than second section brill core 4 diameter phi 2, thereby guarantee that chip removal is smooth and easy.

The content that this specification is not described in detail belongs to this area professional and technical personnel's known prior art.

Claims

1. hard alloy twist drill, comprise shank and operate portions, it is characterized in that: the inside of described operate portions offers cold hole in two with the center symmetry vertically, the brill core of described operate portions comprises two sections, less than second section diameter that bores core away from shank, first section is bored rounding off between core and the second section brill core near first section of shank diameter that bores core.