CN201086151Y

CN201086151Y - Parabola drill

Info

Publication number: CN201086151Y
Application number: CNU2007200432462U
Authority: CN
Inventors: 朱剑鑫; 杨世华
Original assignee: CHANGZHOU WANSUI TOOL PLANT
Current assignee: CHANGZHOU WANSUI TOOL PLANT
Priority date: 2007-08-20
Filing date: 2007-08-20
Publication date: 2008-07-16
Anticipated expiration: 2017-08-20

Abstract

A parabolic drill is provided, which comprises a drill tip at the top, a drilling rod, a helical chip-discharge groove provided on the drilling rod and extending to be connected with the drill tip, and a cutting blade arranged at the junction of the surface of the chip-discharge groove and the surface of the drilling rod. The surface of the chip-discharge groove is parabolic and protruded outwards to be connected with the cutting blade. The service life of the utility model is increased to more than 3 times of the prior twist drill and the maintenance cost is 2/3 of the prior twist drill. Additionally, the parabolic drill has high machining precision, stable product quality and low rate of waste products.

Description

Parabola bores

Technical field

The utility model relates to a kind of drilling tool, especially for the drill bit of processing metallic.

Background technology:

The drill bit similar to the utility model is fluted drill, and the groove face of the screw type chip area of traditional fluted drill is the curved surface of indent, and the chip space during its chip removal is little, and chip removal is not smooth, and cooling fluid is not easy to arrive apex point, and lubricated cooling effect is poor; The reconditioning difficulty of its cutting edge is big, influences the chip breaking effect.Thereby the maintenance cost height of existing fluted drill, working life is short, and the precision of the quality of its product processed and stability are not high.

Summary of the invention

The purpose of this utility model is the above-mentioned shortcoming at existing fluted drill, provides a kind of parabola that improves structure to bore.

The technical scheme that realizes the utility model above-mentioned purpose is: parabola bores, the apex point and the drilling rod that comprise the top, having the spirality chip area on the drilling rod connects with the apex point extension, the groove face of chip area and connection place, drilling rod surface are cutting edge, and the chip area groove face is that the parabolic surface of an evagination connects with cutting edge.

Aforesaid apex point is two relief angle apex points.

The utility model has improved the chip area groove face, the chip area groove face of original fluted drill inner sunken face shape is changed into the Parabolic groove face of evagination, increased chip space greatly, make chip removal smooth and easy, cooling fluid easily arrives apex point, lubricated good cooling results, can make the cutting edge after the reconditioning is positive rake angle, reduce axial force, cut briskly, and can improve the chip breaking effect easily, can increase the helical angle (can reach more than 40 degree) of drill bit, make chip removal more smooth, support apex point to make two relief angles, improve drilling efficiency.The common fluted drill of service life as compared of the present utility model improves more than 3 times, and maintenance cost only is 2/3 of a fluted drill, the machining accuracy height, and the product processed steady quality, percent defective reduces greatly.

Description of drawings

Fig. 1 is the structural representation of the utility model specific embodiment;

Fig. 2 is the axial view of Fig. 1;

Fig. 3 is the comparison diagram of the common fluted drill axial view of the utility model, and what dotted line indicated among the figure is common fluted drill.Can contrast the chip area groove face of two kinds of different shapes among the figure, the chip space that can find out chip area of the present utility model is greater than common fluted drill.

Among the figure, 1 apex point, 2 is drilling rod, and 3 is chip area, and 4 is cutting edge, and 5 is the chip area groove face.

The specific embodiment

Below in conjunction with the description of drawings specific embodiment of the present utility model.

Parabola bores, the apex point 1 and the drilling rod 2 that comprise the top, have spirality chip area 3 on the drilling rod 2 and connect with apex point 1 extension, the groove face 5 and the drilling rod 2 surperficial connection places of chip area 3 are cutting edge 4, and chip area groove face 5 is that the parabolic surface of an evagination connects with cutting edge 4.Apex point 1 is two relief angle apex points.

Claims

1. parabola bores, the apex point and the drilling rod that comprise the top, have the spirality chip area on the drilling rod and connect with the apex point extension, the groove face of chip area and connection place, drilling rod surface are cutting edge, and it is characterized in that: the chip area groove face is that the parabolic surface of an evagination connects with cutting edge.

2. parabola according to claim 1 bores, and it is characterized in that: described apex point is two relief angle apex points.