Method for manufacturing sealing device
The object of the present invention is to effectively prevent the rust generation on a flange portion and to prevent the deformation of the flange portion due to the filling pressure of a molding material in the manufacture of a sealing device whereby a seal main body comprising a rubber-like elastic material and having a portion that covers both surfaces of the flange portion of a metal reinforcing ring is integrally formed on the reinforcing ring by means of a metal mold. To this end, the flange portion of the reinforcing ring is formed in advance with a shape which is distributed unevenly in the direction opposite the direction in which the flange portion is deformed from its original shape by the filling pressure of the molding material.
1. A method of manufacturing a sealing device, comprising:
providing a mold having a molding cavity, a surface of the molding cavity defining a seat;
inserting a reinforcing ring into the mold; and
injecting a rubber material into the mold to form a seal body on the reinforcing ring,
wherein the reinforcing ring has a shape that corresponds to a shape of the seat such that, in a pre-injection state, a portion of the reinforcing ring mates with the seat while another portion of the reinforcing ring is spaced apart from the seat by a first distance, and
during the injecting of the rubber material into the mold, a pressure of the rubber material on the another portion forces the another portion toward the seat such that, in a post-injection state, the another portion of the reinforcing ring is spaced apart from the seat by a second distance that is less than the first distance.
2. The method according to claim 1 , wherein the another portion is inclined in a direction away from the seat to define the first distance.
3. The method according to claim 2 , wherein after the another portion is forced toward the seat by the pressure of the rubber material, the another portion is substantially parallel with the seat.
4. The method according to claim 2 , wherein the reinforcing ring includes a fitting tube that corresponds to the portion of the reinforcing ring that mates with the seat, an outer diameter flange that is connected to the fitting tube and corresponds to the another portion of the reinforcing ring that is spaced apart from the seat by the first distance, and an inner diameter flange that is connected to the fitting tube on an end of the reinforcing ring that is opposite to that of the outer diameter flange.
5. The method according to claim 4 , wherein the inner diameter flange is inclined in a direction opposite to that of the outer diameter flange.
6. The method according to claim 4 , wherein the outer diameter flange includes an intermediate portion that is positioned between an inner portion and an outer portion.
7. The method according to claim 6 , wherein the intermediate portion is inclined in the direction away from the seat, and the inner portion and the outer portion are arranged substantially parallel with the seat.
8. The method according to claim 6 , wherein a step is formed between the intermediate portion and the outer portion of the outer diameter flange.
9. The method according to claim 6 , wherein the intermediate portion includes at least one aperture formed therein.