초록 ▼

A method of manufacturing a blank raw material for a hose end fitting includes several steps, The method includes providing a rod-shaped material having a socket end and a screw-connecting end, and forming at the socket end of the rod-shaped material a pipe-shaped socket portion and a rod-shaped nip

A method of manufacturing a blank raw material for a hose end fitting includes several steps, The method includes providing a rod-shaped material having a socket end and a screw-connecting end, and forming at the socket end of the rod-shaped material a pipe-shaped socket portion and a rod-shaped nipple portion surrounded by the pipe-shaped socket portion. A flange portion is formed having a diameter larger than that of the socket portion in an intermediate portion of the rod-shaped material by fitting a second pipe-shaped mold to the screw-connecting end so as to sandwich and compress the intermediate portion between the first pipe-shaped mold and the second pipe-shaped molds A screw-connecting portion is formed at the screw-connecting end by inserting a punch in a center portion of the rod-shaped material when an external periphery of the rod-shaped material is supported by the second pipe-shaped mold. A rod-shaped nipple having a through-hole extending to a bottom surface of the screw-connecting portion is formed by fitting a pipe-shaped punch between the pipe-shaped socket portion and the rod-shaped nipple portion.

대표청구항 ▼

[ What is claimed:] [1.] A method of manufacturing a blank raw material for a hose end fitting, comprising the steps of:providing a rod-shaped material having a socket end and a screw-connecting end;forming at the socket end of the rod-shaped material a pipe-shaped socket portion and a rod-shaped ni

[ What is claimed:] [1.] A method of manufacturing a blank raw material for a hose end fitting, comprising the steps of:providing a rod-shaped material having a socket end and a screw-connecting end;forming at the socket end of the rod-shaped material a pipe-shaped socket portion and a rod-shaped nipple portion surrounded by the pipe-shaped socket portion, by (i) fitting an external periphery of the rod-shaped material to a first pipe-shaped mold; and(ii) inserting a first pipe-shaped punch into a center portion of the rod-shaped material supported by the first pipe-shaped mold to form by extrusion-molding (i) the rod-shaped nipple portion inside the first pipe-shaped punch and (ii) the pipe-shaped socket portion between the first pipe-shaped punch and the first pipe-shaped mold;forming a flange portion having a diameter larger than that of said socket portion in an intermediate portion of said rod-shaped material by fitting second pipe-shaped mold to the screw-connecting end so as to sandwich and compress the intermediate portion between the first pipe-shaped mold and the second pipe-shaped mold,forming a screw-connecting portion at the screw-connecting end by inserting a punch in a center portion of said rod-shaped material when an external periphery of the rod-shaped material is supported by the second pipe-shaped mold; andforming a rod-shaped nipple having a through-hole extending to a bottom surface of the screw-connecting portion by(i) fitting a pipe-shaped punch between the pipe-shaped socket portion and the rod-shaped nipple portion to support an external periphery of the rod-shaped nipple portion;(ii) inserting a rod-shaped punch in the center portion of said rod-shaped nipple portion while the rod-shaped nipple portion is statically supported by the pipe-shaped punch(iii) forming by extrusion-molding a nipple with a cavity between the pipe-shaped punch; and the rod-shaped punch, and(iv) extending the rod-shaped punch to the bottom surface of the screw-connecting portion to form the through-hole.