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Non-magnetic camshaft journal and method of making same

A technology of camshaft and dynamic magnetic pressing, which is applied in the direction of machines/engines, mechanical equipment, engine components, etc.

Inactive Publication Date: 2011-05-04
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These processes also have drawbacks, as issues related to scale-up of production, size control and uniformity of the microstructure may make the method unacceptable for crystallization

Method used

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  • Non-magnetic camshaft journal and method of making same
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  • Non-magnetic camshaft journal and method of making same

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Experimental program
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Embodiment Construction

[0063] Referring first to FIGS. 1A-1C and FIG. 2 , a conventional DMC process for producing generally cylindrical parts is shown. FIG. 1A shows powdered material 10 placed within a conductive cylindrical armature 20 (also referred to as a sleeve). The coil 30 is connected to a direct current power source (not shown) so that current can be passed through the coil 30 . The powder material 10 substantially fills the conductive armature 20 . Referring specifically to FIG. 1B , a substantial current 40 flows through the coil 30 ; This radially inward pressure acts to squeeze the armature 20 such that the powder material 10 is compacted into a dense part for a very brief time (eg, less than one second) and at a relatively low temperature. Additionally, the operation can (if desired) be performed in a controlled environment to avoid contamination of the material being strengthened. For example, the current flowing through the coil 30 may be on the order of about 100,000 amperes at...

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PUM

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Abstract

A non-magnetic camshaft journal and a method of producing the same. The method uses dynamic magnetic compaction in conjunction with austenitic manganese steel powder metal precursors. Journals formed along the camshaft are configured to cooperate with complementary bearing surfaces, and can be used in cooperation with one or more sensors such that the journal does not magnetically interfere with signals travelling to such sensors. The journals may also be subjected to machining, sintering or both once the dynamic magnetic compaction has been completed.

Description

technical field [0001] The present invention relates generally to the manufacture of non-magnetic steel automotive components by powder metallurgy, and more particularly to the manufacture of austenitic camshaft journals by dynamic magnetic compaction (DMC). Background technique [0002] Automotive engine camshafts are used to open and close valves in synchronization with the movement of pistons, fuel and oxygen in an internal combustion engine. A typical camshaft includes a rotating shaft with a plurality of lobes mounted along the length of the shaft arranged in groups (or sets), where each group is arranged to cooperate with one or more valves in each engine cylinder . As the camshaft rotates, the lobes selectively cause the spring-loaded valves to open or close depending on which phase of the cycle the corresponding piston is in. [0003] The camshaft is mounted to a camshaft housing, cylinder head or associated engine structure by a plurality of journals on the camsha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/087B22F5/00B22F7/08
CPCB22F3/087B22F3/162B22F5/106B22F7/08C22C33/0278C22C38/02C22C38/04F01L1/047F01L2001/0473F01L2001/0476F01L2820/041F01L2301/00F01L2303/00
Inventor S·G·瓦卡德
Owner GM GLOBAL TECH OPERATIONS LLC