| 摘要 |
<p>A method of manufacturing a compressor valve plate ( 36 ) comprises at least the following steps in succession: blanking of a blank of the plate ( 36 ) from a steel sheet of suitable thickness, punching holes corresponding to the output and intake openings, the hole corresponding to the output opening being a preliminary hole ( 48 a) having a diameter larger than the final diameter of this opening ( 48 ), forming, by coining, a depression ( 42 ) for housing an output valve-closure blade ( 54 ), with the depth of the depression increasing towards the end of the depression which corresponds to the preliminary hole ( 48 a), in a manner such that, during the coining, at least some of the material of the blank creeps towards the preliminary hole, partially filling it, calibrating the output opening ( 48 ) to the final diameter by punching, and coining an annular projection ( 50 ) around the calibrated output opening ( 48 ) to define a valve seat for the output closure blade.</p> |
