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Pcd drill and manufacturing method for same

A manufacturing method and drill technology, which can be used in the manufacture of tools, drills, twist drills, etc., can solve the problems of a large amount of wear of diamond abrasive tools, difficult grinding, and long chip flutes, and achieve efficient formation and production. The effect of improving efficiency and improving production efficiency

Active Publication Date: 2019-05-03
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Here, in the case of grinding, although the machining time is short, there is a problem that the amount of wear of the diamond grinder when forming flutes on the PCD is large, so it is difficult to perform grinding many times.
On the other hand, in electrical discharge machining, the machining efficiency is lower than that of grinding, so it takes a long time to form chip flutes

Method used

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  • Pcd drill and manufacturing method for same
  • Pcd drill and manufacturing method for same
  • Pcd drill and manufacturing method for same

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Embodiment Construction

[0031] Next, regarding the method for manufacturing a PCD drill according to the present invention, preferred embodiments will be described in detail with reference to the accompanying drawings in relation to the PCD drill obtained by the method.

[0032] figure 1 It is a schematic overall side view along the longitudinal direction of the PCD drill 10 according to this embodiment. This PCD drill 10 has a tip cutter 12 and a long drill body 14 . Wherein the top cutter 12 is to Figure 4 The illustrated cylindrical body 16 is machined into a tool suitable for the shape of the tip of a drill, and is composed of a substrate 20 and a diamond sintered compact layer (hereinafter also referred to as "PCD layer") 22 as a diamond layer.

[0033] The substrate 20 is a disk-shaped body made of cemented carbide. On the other hand, the PCD layer 22 includes polycrystalline diamond sintered compact (PCD), and is a disk-shaped body provided so as to cover one end surface of the substrate 2...

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Abstract

When forming a first preliminary flute (70) on a PCD layer (22) of a columnar body (16), electrical discharge machining is performed by setting the electrode orientation so that the first twist angleis alpha. Next, when forming a second preliminary flute (74) on a substrate (20) of the columnar body (16) and a round bar (62), the grinding process is performed by setting the grinding orientation and direction for a diamond whetstone (72) so that a second twist angle (beta) is larger than the first twist angle (alpha).

Description

technical field [0001] The invention relates to a PCD drill for cutting and a manufacturing method thereof. Background technique [0002] As one type of drill used for cutting, a PCD drill having a tip including a sintered diamond (PCD) is known. This tip is obtained by cutting out a part of a tip cutter provided with PCD on a substrate made of cemented carbide. Then, the tip is joined to the drill body to form a cutting edge and a thinning surface, and then a flute (chip discharge flute) is formed to produce a body. In addition, the drill main body is made of cemented carbide, for example. [0003] Chip flutes are generally formed by grinding using a diamond grinder or electrical discharge machining (see, for example, Japanese Patent Laid-Open Publication No. 2009-226539). Here, in the case of grinding, although the machining time is short, there is a problem that the amount of wear of the diamond grinder when forming flutes on the PCD is large, so it is difficult to per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23B51/00B23P15/32
CPCB23P15/32B23B2226/315B23B51/02B23B2251/046B23H9/08B24B19/04B23B2222/28
Inventor 福岛宏之小野濑淳也五十岚裕大泽明浩保坂真树黑田友也
Owner HONDA MOTOR CO LTD