Hyperboloid-ellipsoid combined rear tool face twist drill

A flank and twist drill technology, applied in twist drills and other directions, can solve the problems of difficult grinding and high cost, achieve high drilling accuracy, reduce axial force, and reduce surface roughness

Inactive Publication Date: 2004-12-22
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] As mentioned above, other drill types each have their own advantages and scope of application, but a common feature is that it is difficult to grind and the cost is high

Method used

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  • Hyperboloid-ellipsoid combined rear tool face twist drill
  • Hyperboloid-ellipsoid combined rear tool face twist drill

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Embodiment Construction

[0035] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] like figure 1 , figure 2 As shown, the flank of the twist drill is a hyperboloid-ellipsoid composite flank, that is, the part of the flank of the twist drill close to the drill core is a rotating single leaf hyperboloid 3, and the rest of the flank is an ellipsoid 1 . Molding parameters: hyperboloid: a=9, c=9, σ=32°, H=0.5, S=4; ellipsoid: A=19, C=43, σ=32°, S=4; hyperboloid drill Spike height K=4.

[0037] In this embodiment, the point grinding process (disclosed in Chinese invention patent 03132068.6) is adopted, and the point grinding CNC machining program is compiled according to the above parameters; the CNC point grinding forming process program is run, and the hyperboloid point grinding forming CNC machining program is firstly started from the core. Program, after reaching the specified height of the hyperboloid dri...

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Abstract

A spiral drill features that its back cutting surface is composed of a uniparted hyperboloid close to drill center and an ellipsoidal surface. Its advantages are high automatic centering performance, drilling precision and durability.

Description

1. Technical field [0001] The invention relates to a twist drill, in particular to a hyperboloid-ellipsoid composite flank twist drill. 2. Background technology [0002] Twist drill is a kind of hole processing tool with complex shape, and the sharpening type of its flank determines its performance to a large extent. When the tool material is determined, the geometric parameters of the drill tip decisively affect the cutting performance of the drill. It is the different front and rear cutter faces that constitute different blade shapes and create various twist drill shapes, such as the superior performance of the group drill (Ni Zhifu drill bit), which has been recognized all over the world. Therefore, the sharpening pattern of the flank face has been generally paid attention to by drill manufacturers, users and researchers. [0003] (1) Existing drill shapes of twist drills [0004] Ordinary twist drill type [0005] This is the basic drill shape obtained when the flank...

Claims

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Application Information

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IPC IPC(8): B23B51/02
Inventor 李超
Owner NANJING NORMAL UNIVERSITY
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