Method of producing a sintered body

• US 6,090,320 A
• Filed: 12/02/1997
• Issued: 07/18/2000
• Est. Priority Date: 12/04/1996
• Status: Expired due to Term

• Current Assignee: MIBA Sintermetall Aktien-Gesellschaft
• Original Assignee: MIBA Sintermetall Aktien-Gesellschaft
• Inventors: Derflinger, Karl, Grundner, Alois
• Primary Examiner(s): Silbaugh, Janh
• Assistant Examiner(s): Staicovici, Stefan
• Application Number:
  US08/982,549
• Time in Patent Office: 959 Days
• Field of Search: 264/113, 264/125, 156/89.11, 156/293, 156/308.2
• US Class Current: 264/113
• CPC Class Codes: B22F 5/08 of toothed articles, e.g. gear wheels; of cam discs
• CPC Class Codes: B22F 7/062 involving the connection or repairing of preformed parts
• CPC Class Codes: F16H 55/30 Chain-wheels

Abstract

A method of producing a sintered body (1) having different cross-sections along a main axis (5), in particular a toothed-belt or chain wheel, by compression moulding a sintering powder in the direction of the main axis (5) and subsequent sintering. At least two partial bodies (6, 7), which can be form-fitted into each other in the direction of the main axis (5), are pressed from sintering powder, which partial bodies each form an axial portion of the sintered body (1) with different cross-sections, and that the separately pressed and possibly presintered partial bodies (6, 7) are jointly sintered after joining them together.

Claims

1. A method of producing without subsequent mechanical treatment a composite sintered body having different cross-sectional configurations and different dimensions at different locations along a main axis and good dimensional accuracy by compression molding a sintering powder in the direction of the main axis and subsequently sintering, comprising the steps of:

(a) compression molding from a sintering powder at least two partial bodies, each one of the partial bodies having a simpler geometric shape than the composite sintered body and improved uniform density distribution and forming a different axial portion of the sintered body, the partial bodies being shaped so that they may be form-fitted into each other in the direction of the main axis,

(b) form-fitting the separately compression molded partial bodies into each other in the direction of the main axis to join them, and

(c) jointly sintering the joined partial bodies to produce the composite sintered body.

2. The method of claim 1, comprising the further step of presintering the separately compression molded partial bodies before they are jointly sintered.

3. The method of claim 1, comprising the further step of additionally mechanically connecting the jointly sintered partial bodies.

4. The method of claim 3, wherein the jointly sintered partial bodies are mechanically connected by caulking.

5. The method of claim 3, wherein the jointly sintered partial bodies are mechanically connected by beading peripheral portions.

6. The method of claim 1, wherein the partial bodies are compression molded from differing sintering powders.

7. The method of claim 1, wherein the sintered body is a toothed-belt or chain wheel.