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Cobalt-based alloys for wood cutting applications

A cobalt-based alloy and cobalt-rich technology, which can be used in wood processing tools, rotary cutting tools, metal sawing equipment, etc., and can solve the problems of unsuitable wood cutting applications

Pending Publication Date: 2019-05-03
KENNAMETAL INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In many cases, however, cutting tools and associated materials used in metalworking are largely unsuitable for woodcutting applications

Method used

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  • Cobalt-based alloys for wood cutting applications
  • Cobalt-based alloys for wood cutting applications
  • Cobalt-based alloys for wood cutting applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1 - Cobalt-Based Alloy Cutting Tip

[0041] shown in Figure 7 The C150-240 tip in is formed from a cobalt-based alloy with the composition described in Section I herein. Cutting tests were performed using a 10" VDA saw with a 17.125" diameter and 42 teeth. The hook angle is 30° and rises to cut SPF wood. No tip breakage and chipping was observed, and the cobalt-based alloy tip was better than the Stellite TM 12 counterparts are 25-30% sharper. The tip is well grounded and after 8 hours of cutting the saw maintained its sharpness and was better than the Stellite TM 12 A comparison saw is sharper. Therefore, after 8 hours of cutting, Stellite TM 12 saws require sharpening, whereas saws employing the cobalt-based alloys described herein do not require sharpening for subsequent use.

Embodiment 2

[0042] Example 2 - Cobalt-Based Alloy Cutting Tip

[0043] The WG7140 European style tip was formed from a cobalt-based alloy having the composition described in Section I herein. Cutting tests were performed using a larger VDA saw with a 19" diameter and 35 teeth. The hook angle was 28° and was raised to cut spruce, pine, and balsam woods. It should be noted that the tips formed from the cobalt-based alloys described herein were much sharper than Stellite TM The 12 tip is easier to sharpen and the tip looks better than the Stellite TM 12 The tip is sharper. Cobalt-based alloy tips required minimal sharpening after 16 to 24 hours of cutting, indicating high wear resistance.

Embodiment 3

[0044] Example 3 - Cobalt-Based Alloy Cutting Tip

[0045] A 250x0.140 triangular cutting tip was formed from a cobalt-based alloy having the composition described in Section I herein. Cutting tests were performed with a saw having a 22" diameter and 24 teeth. The hook angle was 30° and was raised to cut cedar wood. The test was performed on dirty wood in the cold winter. The cutting tip lasted a full day of cutting (8-9 hours), without replacement.

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PUM

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Abstract

The invention is entitled cobalt-based alloys for wood cutting applications. In one aspect, cobalt-based alloys are described herein comprising composition and microstructure permitting a balance of hardness, toughness and wear resistance desirable for wood cutting applications. A cobalt-based alloy comprises a chromium rich carbide phase in an amount of 15-30 volume percent, a tungsten-rich phasein an amount of 9-15 volume percent and a balance of cobalt-rich solid solution matrix comprising nickel, chromium, vanadium and tungsten.

Description

technical field [0001] The present invention relates to cobalt-based alloys, and in particular, to cobalt-based alloys and associated tools for wood cutting applications. Background technique [0002] Wood cutting is a complex process in which many phenomena intersect. Various factors contribute to a good cut. These factors typically include blade speed, tension, thickness, width, sharpness or tooth angle (gap, face, hook), gullet shape and depth, tooth pitch or spacing, wood feed speed, and wood species. Compared to metals and various alloy systems, wood is not a homogeneous and distinct material, but a multifaceted and heterogeneous biological material. Tool wear can be caused by severe fracture or chipping (catastrophic), abrasion, erosion, microfractures, temperature effects, galvanic corrosion, moisture and / or oxidation. Furthermore, sharp cutting edges have a positive effect on the widely known machining quality, and therefore from an industrial point of view, incre...

Claims

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Application Information

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IPC IPC(8): B27G13/00
CPCC22C19/07C22C29/08C22C32/0047B23D65/00
Inventor A.贝尔哈德贾米达B.麦克莱恩M.姚
Owner KENNAMETAL INC