DRILL BIT BUTTON INSERT AND DRILL BIT

• US 20170328136A1
• Filed: 11/26/2015
• Published: 11/16/2017
• Est. Priority Date: 11/27/2014
• Status: Active Grant

• Current Assignee: Mitsubishi Materials Corporation
• Original Assignee: Mitsubishi Materials Corporation
• Inventors: AKHMADI EKO, Wardoyo, MATSUO, Toshihiko, SAKURAZAWA, Chihiro
• Granted Patent: US 10,352,104 B2
• Time in Patent Office: Days
• CPC Class Codes: B25D 17/02 Percussive tool bits drill bits for earth drilling E21B10/00
• CPC Class Codes: E21B 10/36 Percussion drill bits with helical conveying portion E21B10/445; characterised by wear resisting parts E21B10/46
• CPC Class Codes: E21B 10/56 Button-type inserts E21B10/52 takes precedence
• CPC Class Codes: E21B 10/5671 with chip breaking arrangements
• CPC Class Codes: E21B 10/5673 having a non planar or non circular cutting face

Abstract

A drill bit button insert of the present invention that is attached to a button inserts mounted in a drill bit and performs a drilling, includes a tip body and an abrasive layer formed of a diamond sintered body harder than the tip body coated at least at the button insert working/cutting surface of the tip body, in which the abrasive layer has at least two high hardness layers and a low hardness layer having a hardness lower than that of the high hardness layer disposed between these high hardness layers from the surface side of the abrasive layer toward the tip body side.

Claims

1. A drill bit button insert that is attached to a button inserts mounted in a drill bit and performs a drilling, comprising:

a tip body; and

an abrasive layer formed of a diamond sintered body harder than the tip body coated at least at the button insert working/cutting surface of the tip body, wherein

the abrasive layer has at least two high hardness layers and a low hardness layer having a hardness lower than that of the high hardness layer disposed between these high hardness layers, from the surface side of the abrasive layer toward the tip body side.

2. The drill bit button insert according to claim 1, wherein in the abrasive layer, a plurality of high hardness layers and low hardness layers are alternately disposed from the surface side of the abrasive layer toward the tip body side.

3. The drill bit button insert according to claim 1, wherein the thickness of the high hardness layer is set to be in a range of ½

or more of the thickness of the low hardness layer, and of the thickness of the low hardness layer or less.

4. The drill bit button insert according to claim 1, wherein each of the thickness of high hardness layer and the thickness of the low hardness layer is 150 μ

m or more at the thinnest portion, and 800 μ

m or less at the thickest portion.

5. The drill bit button insert according to claim 1, wherein an intermediate layer having a hardness lower than that of the high hardness layer and a hardness higher than that of the low hardness layer is disposed between the high hardness layer and the low hardness layer, from the surface side of the abrasive layer toward the tip body side.

6. A drill bit in which the drill bit button insert according to claim 1 is attached to a button inserts mounted in a drill bit.