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Small diameter drill

A technology of small diameter and drill bit, which is applied in the direction of repairing drills, twist drills, drilling tool accessories, etc. It can solve the problems of changing cutting performance and difficult re-formation of grinding parts, etc., and achieves slow deterioration speed, improved hole position accuracy, and extended tool life. Effect

Active Publication Date: 2016-10-19
TUNGALOY CORP
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the shape of the thinning portion disclosed in Patent Document 1 is difficult to reshape during regrinding, and the shape of the cutting edge of the small-diameter drill completely changes before and after regrinding.
Therefore, there is a problem that cutting performance completely changes before and after regrinding

Method used

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  • Small diameter drill
  • Small diameter drill
  • Small diameter drill

Examples

Experimental program
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Embodiment Construction

[0021] Embodiments of the present invention will be described with reference to the drawings.

[0022] figure 1 It is an enlarged view of the right side view of the small-diameter drill of the first embodiment. figure 2 yes figure 1 Right side view of the trail drill bit. image 3 yes figure 1 A zoomed-in view of the front view of the trail drill bit. Figure 4 yes figure 1 Sectional view of the IV-IV line direction of the small diameter drill bit. Figure 5 is description figure 1 A zoomed-in view of the front view of the trail drill bit. Figure 6 It is an enlarged view of the right side view of the small-diameter drill of the second embodiment. Figure 7 yes Figure 6 A magnified view of the left side view of the trail drill. Figure 8 It is an enlarged view of the front view of the small-diameter drill of the third embodiment. Figure 9 to Figure 10 It is the experimental result about the small-diameter drill bit.

[0023] Such as Figure 1 to Figure 4 As sho...

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Abstract

To provide a small-diameter drill that improves the position accuracy of the hole, suppresses the reduction in the area of ​​the grinding part due to wear, is strong in resistance to damage and breakage, and is easy to regrind, and can maintain the surface after regrinding to a certain extent. cutting performance. There is a concave portion (6) extending from the top end surface (3) toward the rear end side so that the thickness of the drill core (9) in at least the top end region of the small-diameter drill is thinned, and the cutting edge (4) includes: a first cutting edge portion ( 4a), formed at the intersection of the rake face and the top end face (3), the rake face is formed in at least one groove (2) and has a positive rake angle; the second cutting edge portion (4b), formed at the front At least a part of the intersection of the rake face and the top end face (3), the rake face is formed in the concave portion (6) to have a positive rake angle, the second cutting edge portion (4b) and the first cutting edge portion (4a) connected and intersected with the chisel edge (5).

Description

technical field [0001] The invention relates to a small-diameter drill with a diameter below 3.175 mm (1 / 8 inch). Background technique [0002] Among conventional small-diameter drills, there is a drill disclosed in Patent Document 1, for example. That is, the invention of Patent Document 1 is a small-diameter drill having two grooves arranged symmetrically with respect to the axis of rotation of the tool, having a cutting edge and a chisel edge at the tip, and having a diameter of φ3.175 mm or less. The grinding part is formed symmetrically to the axis line. [0003] Patent Document 1: Japanese Patent Application Laid-Open No. 7-164228. [0004] The purpose of the small-diameter drill in Patent Document 1 is to improve the positional accuracy of the processed hole (hereinafter referred to as hole positional accuracy) especially when drilling holes on printed circuit boards on which integrated circuits and various electronic components are mounted. However, in the small-d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23B51/00
CPCB23B51/02B23B2251/14B23B2251/406B23B51/011
Inventor 香月崇大峰惠池上英儿堀川进一西登志和
Owner TUNGALOY CORP
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