Method for producing a mechanical part provided with a plastic moulded lining

Method for producing a mechanical part including a body provided with a plastic lining molded in a peripheral throat of the body, said lining defining at least a sealing lip comprising at least one functional surface in contact wlth another mechanical part with respect to which the first mechanical part is mobile, said method comprising the steps of:

• using a mould including a main body comprising a molding surface intended to shape on its own said functional surface of the lining, and at least two complementary secondary cores;
• having, as the central core, the body of the mechanical part in the main body of the mould;
• placing the secondary cores by inserting at least in part the indentation of the secondary cores in the peripheral throat provided by the body of the mechanical part forming the central core, in order to define in the molded lining an annular chamber open radially and the sealing lip;
• closing the mould;
• injecting the plastic material;
• opening the mould;
• removing the secondary cores;
• and
• extracting the mechanical part from the main body of the mould.