Method of treating a cemented carbide mining insert

Patent metadata

Field	Value
Publication number	US-12545977-B2
Application number	US-202117924394-A
Country	US
Kind code	B2
Filing date	May 12, 2021
Priority date	May 14, 2020
Publication date	Feb 10, 2026
Grant date	Feb 10, 2026

Abstract

A method of redistributing the binder phase of a cemented carbide mining insert having a WC hard-phase component, optionally one or more further hard-phase components and a binder includes the steps of providing a green cemented carbide mining insert; applying at least one binder puller selected from a metal oxide or a metal carbonate to only at least one local area of the surface of the green cemented carbide insert; sintering the green carbide mining insert to form a sintered cemented carbide insert; and subjecting the sintered cemented carbide insert to dry tumbling process executed at an elevated temperature of or above 100° C., preferably at a temperature of or above 200° C., more preferably at a temperature of between 200° C. and 450° C.

First claim

The invention claimed is:

1 . A method of redistributing a binder phase of a cemented carbide mining insert having a WC hard-phase component, optionally one or more further hard-phase components and a binder, the method comprising the steps of:
providing a green cemented carbide mining insert; applying at least one binder puller selected from a metal oxide or a metal carbonate to 0.5 to 85% of the total surface area of the green cemented carbide insert; sintering the green carbide mining insert to form a sintered cemented carbide insert; and subjecting the sintered cemented carbide insert to a dry tumbling process executed at an elevated temperature between 100° C. to 600° C.

2 . The method according to claim 1 , wherein the at least one binder puller is Cr 2 O 3 .

3 . The method according to claim 1 , further comprising the step of heating the mining insert and media prior to the tumbling process and the tumbling process is performed on the heated mining insert.

4 . The method according to claim 1 , wherein the mining insert is kept heated during the tumbling process.

5 . The method according to claim 1 , wherein all or part of the heat is generated by friction between the mining insert and any media added in the tumbling process.

6 . The method according to claim 1 , wherein the tumbling process is a High Energy Tumbling process, wherein post tumbling a homogenous cemented carbide mining insert has been deformation hardened such that ΔHV3%≥9.72−0.00543*HV3 bulk , wherein ΔHV3% is a percentage difference between a HV3 measurement at 0.3 mm from the surface compared to the HV3 measurement in the bulk.

7 . The method according to claim 1 , wherein after the mining insert has been subjected to the tumbling process at an elevated temperature, the mining insert is subjected to a second tumbling process at room temperature.

8 . The method according to claim 7 , wherein the second tumbling process is a high energy tumbling process.

Assignees

• Sandvik Mining And Construction Tools Ab

Inventors

• Lilja Mirjam
• Garcia Jose Luis
• Blomqvist Andreas
• Arvanitidis Ioannis
• Holmstrom Erik

Classifications

• C21D9/22

  for drills; for milling cutters; for machine cutting tools · CPC title

• B22F3/24

  After-treatment of workpieces or articles {(B22F3/1146 takes precedence)} · CPC title

• C22C29/08

  based on tungsten carbide · CPC title

• C22C29/067

  comprising a particular metallic binder · CPC title

• E21C35/1835

  Chemical composition or specific material · CPC title