Method of making a composite thread protector
First Claim
1. A method of making a composite elastomer to metal shell dual wall thread protector for a threaded end of a pipe member that is practical for use and reuse under elevated, normal and frigid temperature conditions which comprises, deepdraw forming a metal blank into an elongated cylindrical shell having a continuous substantially closed end wall and an opposite substantially open end wall, forming a casting assembly by placing the metal shell and its closed end wall in a cooperating mold cavity defining relation with respect to a hollow die having an opposed threaded side wall therealong, introducing a normally thermoplastic synthetic elastomer material in heat-liquidized form into and filling the mold cavity along the threaded wall of the die, solidifying by preliminarily heat-curing the elastomer material within the mold cavity as an adherent wall casting along the metal shell wall and forming a solidified elastomer to metal shell adherent dual wall assembly therewithin, then removing the hollow die by unscrewing the thus-formed elastomer to metal shell adherent dual wall assembly with respect to the die, thereafter subjecting the elastomer wall of the dual wall assembly to a final heat-curing treatment, and effecting the heat-curing in such a manner as to make the solidified elastomer wall fully thermosetting and to also improve its resistance to chemicals such as encountered in the oil fields.
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Accused Products
Abstract
A composite dual wall cast urethane elastomer to metal thread protector that will be practical under normal as well as frigid temperature conditions of usage is formed by deep drawing a seamless metal shell wall, using a threaded die to define a mold cavity with the metal shell wall, forming and setting a synthetic elastomeric shell wall within the mold cavity in an adhering assembled relation with and along the metal shell wall with threading that is complementary with threading of the die, removing the assembly by unscrewing it with respect to the threaded die, and subjecting the assembly to heat treatment to cure the elastomeric shell wall and provide a composite protector having a cast urethane elastomer wall in a secure adhering encapsulating relation on the metal shell wall.
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Citations
10 Claims
- 1. A method of making a composite elastomer to metal shell dual wall thread protector for a threaded end of a pipe member that is practical for use and reuse under elevated, normal and frigid temperature conditions which comprises, deepdraw forming a metal blank into an elongated cylindrical shell having a continuous substantially closed end wall and an opposite substantially open end wall, forming a casting assembly by placing the metal shell and its closed end wall in a cooperating mold cavity defining relation with respect to a hollow die having an opposed threaded side wall therealong, introducing a normally thermoplastic synthetic elastomer material in heat-liquidized form into and filling the mold cavity along the threaded wall of the die, solidifying by preliminarily heat-curing the elastomer material within the mold cavity as an adherent wall casting along the metal shell wall and forming a solidified elastomer to metal shell adherent dual wall assembly therewithin, then removing the hollow die by unscrewing the thus-formed elastomer to metal shell adherent dual wall assembly with respect to the die, thereafter subjecting the elastomer wall of the dual wall assembly to a final heat-curing treatment, and effecting the heat-curing in such a manner as to make the solidified elastomer wall fully thermosetting and to also improve its resistance to chemicals such as encountered in the oil fields.
Specification