| 摘要 |
A method for manufacturing a component for use in an electromagnetically actuated clutch, such as an armature or a pole piece, having one or more flux breaks provided therein includes the initial step of providing a mold having an upstanding central post which defines an annular mold cavity. A quantity of powdered metal material is disposed within the mold cavity. The powdered metal material is formed from a magnetically permeable material, such as a ferromagnetic material. Next, one or more preforms of a non-magnetically permeable material are disposed within the mold cavity. The preform is placed on top of the quantity of powdered metal material axially above the desired location for the magnetically non-conductive region of the component to be formed. Then, a ram of a press machine is moved axially downwardly into engagement with the preform and the powdered metal material contained within the mold. As the ram moves downwardly, it initially engages the preform, moving it axially downwardly through the powdered metal material until the preform engages the lower surface of the mold. Further downward movement of the ram compresses both the preform and the powdered metal material into a single integrated component preform. Lastly, the ram is retracted to permit removal of the component preform, and the component preform is placed in a conventional sintering oven to form the final component.
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