Method for producing plastic assembly parts

Method for fabricating objects or parts thereof formed of an assembly comprising at least two parts made of plastic materials which can move in relation to one another, with at least one degree of freedom and for which corresponding surfaces at least partially match with complementary shapes such that there is at least one geometric configuration in which the parts are solidly interconnected on a common surface in close, clearance-free contact, comprising the steps of:

• a) injecting or compression molding a first part made of at least one plastic material by moving a first tool and a second tool towards each other, the second tool presenting an impression including the common surface, the combined impressions of the two tools delimiting the volume of the first part at the end of the moving;
• b1) separating the first tool and the said second tool and extracting the first part;
• b2) placing the first part on a support tool that has a contact surface with the first part mechanically equivalent to the contact surface that existed between the first tool and the first part, the placing being done on the support tool such that the common surface on the first part faces outward and can act as a mold for the second part.
• c) producing a blank by extruding at least one thermoplastic material, and removing a predetermined quantity of the at least one extruded thermoplastic material to form the blank, the plastic material at a periphery of the blank being immiscible with the plastic material at a periphery of the first part;
• d) depositing the blank at a temperature higher than the softening temperature of said at least one thermoplastic material on the surface of the first part fixed to the support tool or in an impression of a third molding tool;
• e) placing a third molding tool facing the assembly of the first part fixed to the support tool, the third tool having an impression that, when it comes into contact with the assembly of the first part fixed to the support tool, delimits the volume of a second part with the surface of the first part, and optionally a portion of the impression formed in the first tool;
• f) moving the assembly of the first part and the support tool towards the third tool until the assembly and the third tool come into contact, the moving causing thereby compression of the blank until a required shape of the second part is obtained;
• and
• g) separating the support tool and the third tool and extracting an assembly of the two parts thus formed.