# US 10,501,888 B2 · Cast refiner plate segment with blunt edges and corners for safe handling

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- Number: US 10,501,888 B2
- Document ID: US10501888B2
- Status: Granted
- Kind: B2
- Application number: 15/432,245
- Filed: 2017-02-14
- Published: 2017-06-01
- Granted: 2019-12-10
- Earliest claimed: 2013-02-01
- Assignees: Andritz Inc.
- Applicants: Andritz Inc.
- Inventors: Luc Gingras; Yves Raymond
- Web page: https://patentgrep.com/patent/US10501888B2

## CPC

- D21D 1/306: {Discs}
- B02C 7/12: Shape or construction of discs
- B22C 9/02: Sand moulds or like moulds for shaped castings
- B22C 9/22: Moulds for peculiarly-shaped castings
- B22D 25/02: by its peculiarity of shape; of works of art {(cylinders, pistons B22D15/02)}
- B23P 15/28: cutting tools (sawing tools B23D63/00, B23D65/00; files or rasps B23D73/00)
- D21D 1/008: {Discs}
- Y10T 29/49989: Followed by cutting or removing material
- D21D: TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- B02C: CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN ({household tools and machines for pulverising foodstuffs, e.g. coffee and spice mills A47J42/00; pharmaceutical mortars A61J3/02; mechanical processing of refuse and garbage B03B9/06; dressing mould materials by grinding B22C5/04}; obtaining metallic powder by crushing, grinding or milling B22F9/04; {recovery of plastics by disintegrating B29B17/00; crushing raw materials in starch making C08B30/02; beaters for papermaking D21D1/02; crushing devices specially for transport in mines E21F13/002; slag crushing devices F23J1/00; fuel milling devices in combustion apparatus F23K1/00; household devices for crushing coal F24B15/02; ice disintegrating devices F25C5/02})
- B22C: FOUNDRY MOULDING (moulding refractory materials in general B28B)
- B22D: CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES (shaping of plastics or substances in a plastic state B29C; metallurgical processing, selection of substances to be added to metal C21, C22)
- B23P: METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS (arrangements for copying or controlling B23Q)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A cast metal plate segment for a refiner of lignocellulosic material or a disperser of comminuted paper or packaging products, the plate segment including a front side with a front surface configured to refine the lignocellulosic material or disperge the comminuted paper or packaging products, and a back side, opposite to the front side, including a corner or edge, wherein the corner or edge comprises a casted surface between machined planar surfaces adjacent the corner or edge.

## Claims

### Claim 1

A method of forming a plate segment comprising:
casting a plate segment, wherein the plate segment comprises a front side having a refining surface configured to develop material sent through a mechanical refiner or disperser, and a back side having a third cast surface disposed between a first cast surface and a second cast surface at a junction, wherein the first cast surface is substantially perpendicular to the second cast surface;
machining the first cast surface to form a first machined surface; and
machining the second cast surface to form a second machined surface, wherein the third cast surface remains after machining the first cast surface and the second cast surface, and wherein the third cast surface remains disposed between the first machined surface and the second machined surface.

### Claim 2 (depends on 1)

The method of claim 1, wherein machining the first cast surface removes about 1 mm from the first cast surface to form the first machined surface.

### Claim 3 (depends on 1)

The method of claim 1, wherein machining the second cast surface removes about 1 mm from the second cast surface to form the second machined surface.

### Claim 4 (depends on 1)

The method of claim 1, wherein the third cast surface remaining after the machining steps is a cast blunt surface.

### Claim 5 (depends on 4)

The method of claim 4, wherein the cast blunt surface is a cast rounded surface.

### Claim 6 (depends on 4)

The method of claim 4, wherein the cast blunt surface is a cast chamfer surface.

### Claim 7 (depends on 6)

The method of claim 6, wherein the cast chamfer surface forms an angle θ at an intersection of the first machined surface and the third cast surface, wherein the angle θ is between 105 degrees and 165 degrees.

### Claim 8 (depends on 6)

The method of claim 6, wherein the cast chamfer surface forms an angle θ at an intersection of the second machined surface and the third cast surface, wherein the angle θ is between 105 degrees and 165 degrees.

### Claim 9 (depends on 4)

The method of claim 4, wherein the cast blunt surface extends along a perimeter on the back side of the plate segment.

### Claim 10 (depends on 4)

The method of claim 4, wherein the cast blunt surface is on a body junction, and wherein the first machined surface and the second machined surface are surfaces of a rib on the back side of the plate segment.

### Claim 11 (depends on 1)

The method of claim 1, wherein the third cast surface has a radius of 1.5 times to 2.5 times a depth of a total cast material removed during the machining of the first cast surface and the second cast surface.

### Claim 12 (depends on 1)

The method of claim 1 further comprising filling a casting mold with sand to form a negative mold of the plate segment, wherein the casting mold is a positive mold of the plate segment, and wherein the casting mold comprises a blunt surface corresponding to the third cast surface of the plate segment.

### Claim 13 (depends on 12)

The method of claim 12 further comprising removing the casting mold from the negative mold before pouring molten metal into the negative mold; and allowing the molten metal to cool to form a cast plate segment.

### Claim 14

A method of forming a plate segment comprising:
casting a plate segment, wherein the plate segment comprises a front side having a refining surface configured to develop material sent through a mechanical refiner or disperser, and a back side having a third cast surface disposed between a first cast surface and a second cast surface at a junction; and
machining the first cast surface to form a first machined surface, wherein the third cast surface remains after machining the first cast surface, and wherein the third cast surface separates the first machined surface from the second cast surface.

### Claim 15 (depends on 14)

The method of claim 14, wherein the junction between the first cast surface and the second cast surface is a body junction.

### Claim 16 (depends on 14)

The method of claim 14 further comprising machining the second cast surface to form a second machined surface.

### Claim 17 (depends on 16)

The method of claim 16, wherein the junction between the first cast surface and the second cast surface is an outer junction selected from the group consisting of a perimeter junction on the back side of the plate segment, and a perimeter junction on the front side of the plate segment, wherein the perimeter junction on the back side of the plate segment is disposed at a back side outer perimeter of the refiner plate segment, and wherein the perimeter junction on the front side of the plate segment is disposed at a front side outer perimeter of the refiner plate segment.

### Claim 18 (depends on 14)

The method of claim 14, wherein the first cast surface is substantially perpendicular to the second cast surface.