Method of forming green part and manufacturing method using same

Patent metadata

Field	Value
Publication number	US-10011044-B2
Application number	US-201414479738-A
Country	US
Kind code	B2
Filing date	Sep 8, 2014
Priority date	Jul 21, 2014
Publication date	Jul 3, 2018
Grant date	Jul 3, 2018

Abstract

A method of manufacturing a part, including providing a green body made of powder injection molding material and connected to a solid support member partially contained in the green body. The support member is engaged with a retaining fixture of a machine tool. While supporting the green body through the engagement between the support member and the retaining fixture, the green body is machined to obtain a machined green part. The machined green part is debound and sintered. A method of forming a powder injection molding part in a green state including machining a molded body using a machine tool while supporting the blank with a retaining fixture, and a machining blank having a green body and a solid support member including one locating feature of a pair of complementary locating features snuggly engageable with one another are also discussed.

First claim

The invention claimed is:

1. A method of manufacturing a part, the method comprising:
providing a green body made of powder injection molding material, the powder injection molding material including a solidified binder and a powder material mixed with the binder, the green body being connected to a solid support member partially contained in the green body, the solid support member retained in the green body;
engaging the support member with a retaining fixture of a machine tool;
while supporting the green body through the engagement between the support member and the retaining fixture, machining the green body using the machine tool to obtain a machined green part; and
debinding and sintering the machined green part.

2. The method as defined in claim 1 , wherein providing the green body includes molding the green body by injecting a feedstock of the powder injection molding material into a mold cavity containing an inner portion of the support member to connect the portion of the support member with the green body, and removing the connected green body and support member from the mold cavity.

3. The method as defined in claim 2 , wherein the support member includes an outer portion forming a hollow perimeter with the inner portion extending inwardly from the outer portion, and molding the green body is performed such that the outer portion of the support member surrounds the green body.

4. The method as defined in claim 2 , wherein the support member is a shaft and includes an outer portion extending from the inner portion, and molding the green body is performed such that the outer portion of the support member extends out of the green body along a central axis of the green body.

5. The method as defined in claim 1 , further comprising, prior to debinding and sintering, disengaging the support member from the machined green part.

6. The method as defined in claim 1 , wherein:
machining the green body is performed to obtain the machined green part and a retaining portion engaged to the support member and connected to the machined green part;
after machining the green body, the machined green part remains connected to the support member only through the retaining portion; and
the method further comprises disengaging the support member from the machined green part by separating the machined green part from the retaining portion.

7. The method as defined in claim 1 , wherein engaging the support member with the retaining fixture maintains the green body in a fixed position during the machining.

8. The method as defined in claim 1 , wherein machining the green body includes rotating the green body with the retaining fixture about a central axis of the support member.

9. The method as defined in claim 1 , wherein engaging the support member with the retaining fixture includes snuggly engaging first and second complementary locating features with one another, the first locating feature being provided on the support member and the second locating feature being provided on the retaining fixture.

Assignees

• Pratt & Whitney Canada

Inventors

• Campomanes Marc
• Scalzo Orlando
• Fournier Jean
• Poitras Guillaume

Classifications

• B22F3/225

  by injection molding · CPC title

• B22F7/08

  with one or more parts not made from powder {(B22F7/062 takes precedence)} · CPC title

• C04B35/56

  based on carbides {or oxycarbides (containing free metal binder C22C29/00)} · CPC title

• B22F2998/10

  Processes characterised by the sequence of their steps · CPC title

• C04B2235/6022

  Injection moulding · CPC title