Method of manufacturing brake disc of heterogeneous materials and brake disc of heterogeneous materials manufactured using the same

Patent metadata

Field	Value
Publication number	US-10598237-B2
Application number	US-201715815207-A
Country	US
Kind code	B2
Filing date	Nov 16, 2017
Priority date	May 23, 2017
Publication date	Mar 24, 2020
Grant date	Mar 24, 2020

Abstract

A method of manufacturing a brake disc of heterogeneous materials, may include a disc device and a hub device formed in a cast-bonding manner using different materials, includes performing a first casting for casting the disc device using a grey cast-iron material, performing a preparation step by placing the disc device in a casting mold as an insert, performing a second casting for preparing a brake disc cast product by injecting molten aluminum alloy into the casting mold and casting the hub device to be cast-bonded to the disc device, and performing an oxynitriding process for forming an oxynitride layer by smoothing a surface of the brake disc cast product and performing heat treatment in a gaseous atmosphere at a temperature ranging from 425 to 500° C.

First claim

What is claimed is:

1. A method of manufacturing a brake disc of heterogeneous materials, including a disc device and a hub device formed in a cast-bonding manner using different materials, the method comprising:
performing a first casting for casting the disc device using a grey cast-iron material;
performing a preparation step by placing the disc device in a casting mold as an insert;
performing a second casting for preparing a brake disc cast product by injecting molten aluminum alloy into the casting mold and casting the hub device to be cast-bonded to the disc device; and
performing an oxynitriding process for forming an oxynitride layer by smoothing a surface of the brake disc cast product and performing a heat treatment in a gaseous atmosphere at a temperature ranging from 425 to 500° C.

2. The method according to claim 1 , wherein performing the oxynitriding process includes forming the oxynitride layer on the surface of the brake disc cast product by performing the heat treatment for a time period ranging from 7 to 15 hours.

3. The method according to claim 1 , wherein performing the oxynitriding process includes forming the oxynitride layer to a thickness ranging from 1 to 15 μm.

4. The method according to claim 1 , further including:
performing a preheating process, before performing the preparation step, for preheating the disc device at a temperature which is higher than the temperature of the heat treatment in performing the oxynitriding.

5. The method according to claim 4 , wherein the temperature in performing the preheating ranges from 445 to 520° C.

6. The method according to claim 1 , further including:
performing an ending process, after performing the oxynitriding process, for compensating for a disc thickness variation and a run-out by processing the hub device.

7. The method according to claim 6 , wherein performing the ending process includes processing the hub device wherein the disc thickness variation is 7 μm or less and the run-out is 30 μm or less.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Kim Yoon Cheol
• Han Jai Min
• Rhee Yoon Joo
• Chung Min Gyun
• Lee Byung Chan
• Lee Jae Young

Classifications

• C23C8/28

  more than one element being applied in one step · CPC title

• F16D2250/0007

  Casting · CPC title

• F16D65/125 Primary

  characterised by the material used for the disc body · CPC title

• F16D65/127

  characterised by properties of the disc surface; Discs lined with friction material · CPC title

• F16D2065/132

  layered · CPC title