# US 10,814,435 B2 · Cutting insert, cutting tool comprising such an insert and methods for producing and repairing such a tool

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- Number: US 10,814,435 B2
- Document ID: US10814435B2
- Status: Granted
- Kind: B2
- Application number: 15/039,996
- Filed: 2014-11-28
- Published: 2017-01-05
- Granted: 2020-10-27
- Earliest claimed: 2013-11-29
- Assignees: Diamonde
- Applicants: Diamonde
- Inventors: Timothée Grunder; Anne Piquerez
- Web page: https://patentgrep.com/patent/US10814435B2

## CPC

- B23K 31/025: {Connecting cutting edges or the like to tools; Attaching reinforcements to workpieces, e.g. wear-resisting zones to tableware}
- B23C 5/18: with permanently-fixed cutter-bits or teeth
- B23D 61/028: {of special material}
- B23K 1/0008: {specially adapted for particular articles or work}
- B23K 1/203: {Fluxing, i.e. applying flux onto surfaces}
- B23K 35/0222: {for use in soldering or brazing (B23K35/0205 takes precedence)}
- B23K 35/0233: {Sheets or foils (B23K35/0244 takes precedence)}
- B23K 35/0238: {layered}
- B23K 35/0244: {Powders, particles or spheres; Preforms made therefrom}
- B23K 35/30: with the principal constituent melting at less than 1550°C
- B23K 35/3006: {Ag as the principal constituent}
- B23P 15/28: cutting tools (sawing tools B23D63/00, B23D65/00; files or rasps B23D73/00)
- B32B 9/005: {comprising one layer of ceramic material, e.g. porcelain, ceramic tile (layered products with at least two ceramic layers composed mainly of ceramic B32B18/00)}
- B32B 9/041: {of metal}
- B32B 15/18: comprising iron or steel {(B32B15/011, B32B15/012 and B32B15/013 take precedence)}
- C04B 37/006: {consisting of metals or metal salts}
- C04B 37/026: {consisting of metals or metal salts}
- B23C 2224/04: Aluminium oxide
- B23C 2226/18: Ceramic
- B23C 2240/08: Brazed connections
- B23K 2101/20: Tools
- B23K 2103/172: {wherein at least one of the layers is non-metallic}
- B23K 2103/18: Dissimilar materials
- B23K 2103/26: {Alloys of Nickel and Cobalt and Chromium}
- B23K 2103/52: {Ceramics}
- B32B 2255/205: Metallic coating
- C04B 2235/6581: Total pressure below 1 atmosphere, e.g. vacuum
- C04B 2237/122: based on refractory metals
- C04B 2237/125: based on noble metals, e.g. silver
- C04B 2237/126: wherein the active component for bonding is not the largest fraction of the interlayer
- C04B 2237/127: The active component for bonding being a refractory metal
- C04B 2237/343: Alumina or aluminates
- C04B 2237/348: Zirconia, hafnia, zirconates or hafnates
- C04B 2237/36: Non-oxidic
- C04B 2237/401: Cermets
- C04B 2237/406: Iron, e.g. steel
- C04B 2237/55: Pre-treatments of a coated or not coated substrate other than oxidation treatment in order to form an active joining layer
- C04B 2237/60: Forming at the joining interface or in the joining layer specific reaction phases or zones, e.g. diffusion of reactive species from the interlayer to the substrate or from a substrate to the joining interface, carbide forming at the joining interface
- C04B 2237/72: Forming laminates or joined articles comprising at least two interlayers directly next to each other
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23C: MILLING (broaching B23D; broach-milling in making gears B23F; arrangement for copying or controlling B23Q)
- B23D: PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR (making toothed gears or the like B23F; cutting metal by applying heat locally B23K; arrangements for copying or controlling B23Q)
- B23P: METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS (arrangements for copying or controlling B23Q)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE

## Abstract

The invention relates to an insert brazed on a body of cutting tools (101), consisting of: a metal substrate (11), in the form of plates, having a surface for attachment to the tool body; a high-temperature, brazing, alloy layer (12); an intermediate layer; and a ceramic plate (14). The brazing alloy layer connects the metal substrate (11) of the ceramic plate (14) via the metal layer (13). A low-temperature brazing layer (1) connects the insert (1, 1′) to the body of the tool (101).

## Claims

### Claim 1

Cutting insert for brazing onto a cutting tool body for working wood-based composite materials, the cutting insert comprising:
a substrate (11) in the form of a plate with a fastening surface (11 a) to the cutting tool body, where the substrate (11) includes tungsten carbide, steel, nickel steel, or a tungsten carbide-cobalt composite,
a high-temperature brazing alloy layer (12)
an intermediate metal layer (13)
a ceramic plate (14) that consists of alumina (Al2O3), zirconia, zirconia-yttria, or a combination thereof, the ceramic plate (14) having the same dimensions as the substrate (11),
the high-temperature brazing alloy layer (12) connecting the substrate (11) to the ceramic plate (14) by means of the intermediate metal layer (13), where the intermediate metal layer (13) is between the ceramic plate (14) and the high-temperature brazing alloy layer (12), and
the high-temperature brazing alloy (12) is an alloy of silver-copper with more than 50% by volume of silver or an alloy of silver, indium, and titanium.

### Claim 2 (depends on 1)

The cutting insert according to claim 1, characterized in that the substrate (11) is connected to the high-temperature brazing alloy layer (12) by means of a metal layer (15) comprising titanium.

### Claim 3 (depends on 1)

The cutting insert according to claim 1, characterized in that the substrate (11) includes steel, nickel steel C45, or a tungsten carbide-cobalt composite.

### Claim 4 (depends on 1)

Cutting tool comprising a rotary metal tool body (101), said body having an active surface that is aligned with two or more of the cutting inserts (1, 1′) according to claim 1, the cutting tool characterized in that the cutting inserts (1, 1′) are connected to the tool body (101) by a low-temperature brazing alloy layer (16), where the low-temperature brazing alloy layer (16) is between the active surface of the tool body (101) and the substrates (11) of the cutting inserts (1, 1′).

### Claim 5 (depends on 4)

The cutting tool according to claim 4, characterized in that the low-temperature brazing alloy is a silver-copper alloy containing at least 60% by volume of silver.

### Claim 6

Production method of a cutting tool for working wood-based composite materials, the method comprising:
a) using a ceramic plate (14) consisting of alumina (Al2O3), zirconia, zirconia-yttria, or a combination thereof, and a substrate (11) that includes tungsten carbide, steel, nickel steel, or a tungsten carbide-cobalt composite, the ceramic plate (14) having the same dimensions as the substrate (11),
b) applying an intermediate metal layer (13) to the ceramic plate (14),
c) applying a high-temperature brazing alloy (12) between the intermediate metal layer (13) and the substrate (11),
d) brazing the ceramic plate (14) to the substrate plate (11) by high-temperature vacuum brazing with the high-temperature brazing alloy (12), the high-temperature brazing alloy (12) being an alloy of silver-copper with more than 50% by volume of silver or an alloy of silver, indium, and titanium, to form an assembly (20),
e) cutting out of the assembly (20) obtained in this way a cutting insert (1 or 1′),
f) brazing the cutting insert (1 or 1′) on to a tool body by brazing at atmospheric pressure, at low temperature, with a low temperature brazing alloy, to form the cutting tool.

### Claim 7 (depends on 6)

The production method according to claim 6, characterized in that the step b) of applying the intermediate metal layer (13) to the ceramic plate (14) includes applying a coat of metallic paint.

### Claim 8 (depends on 6)

The production method according to claim 6, characterized in that the vacuum brazing of step d) is carried out at a high temperature included between 760° C. and 820° C. and the brazing at atmospheric pressure in step f), is carried out at the low temperature included between 560° C. and 620° C.

### Claim 9 (depends on 6)

The production method according to claim 6, further comprises a step of applying a brazing flux to the cutting insert (1 or 1′) and the tool body before step f) of brazing at atmospheric pressure.

### Claim 10 (depends on 6)

The production method according to claim 6, further comprising the step of sharpening the cutting inserts (1 or 1′) using an abrasive grinder.

### Claim 11 (depends on 4)

Process for repairing the cutting tool of claim 4, by replacing a cutting insert that has deteriorated, the process comprising:
heating locally, at atmospheric pressure, the cutting tool to destroy the low-temperature brazing alloy layer between the substrate of the cutting insert that has deteriorated and the tool body; and
attaching a new cutting insert having a substrate to the tool body by local brazing at atmospheric pressure and low temperature to form a new low-temperature brazing alloy layer between the substrate and the tool body.

### Claim 12 (depends on 11)

The process of claim 11, wherein the step of heating the cutting tool to destroy the low-temperature brazing alloy layer comprises electromagnetic induction.