Tee type connector pipe manufacturing method
[SUMMARY] The present invention is capable of manufacturing an integrated tee type pipe by forming a molding pipe part, with pulling a periphery of a molding hole and protruding it to the outward direction through a pressing device and a molding device, while forming a molding hole of a predetermined shape on an upper side of a straight pipe; and manufacturing a tee type pipe that ensures robustness, productivity, and workability, accordingly.
1. A tee type connector pipe manufacturing method, comprising:
a step S- 1 , in which an oval-shaped molding hole ( 11 ) is drilled in the center of a metal plate ( 10 ), and then the metal plate ( 10 ) is roll-formed into a tube-shaped straight pipe ( 20 );
a step S- 2 , settling down a jig pipe ( 100 ), which has a seating place ( 110 ) formed in an inner side and a circular-shaped insertion hole ( 120 ) formed in a center, in a lower mold ( 200 );
a step S- 3 , positioning a molding stone ( 300 ), which has a curved outer circumferential surface, into the seating place ( 110 ) through the insertion hole ( 120 );
a step S- 4 , positioning the straight pipe ( 20 ) to an outer side of the jig pipe ( 100 );
a step S- 5 , combining and securing an upper mold ( 400 ) with the lower mold ( 200 );
a step S- 6 , combining the molding stone ( 300 ) with a shaft ( 510 ) of a press device ( 500 ) that has passed through a pass-through hole ( 410 ) formed in the upper mold ( 400 );
a step S- 7 , lifting the shaft ( 510 ) to forcibly pass the molding stone ( 300 ) through the molding hole ( 11 ) to form a molding pipe part ( 31 ), then to form a tee type pipe ( 30 ); and
a step S- 8 , disuniting the upper mold ( 400 ) and the lower mold ( 200 ), and separating the tee type pipe ( 30 ) from the jig pipe ( 100 )
wherein, in the step S- 1 , a ratio between the diameter (d) of the straight pipe ( 20 ) and the minor axis diameter (b) of the molding hole ( 11 ) is 1:0.4, and a ratio between the minor axis diameter (b) and the major axis diameter (c) of the molding hole ( 11 ) is 1:2, and
wherein, in the step S- 3 , a radius (r) of an outer circumferential surface of the molding stone ( 300 ) is same to a radius (d) of the straight pipe ( 20 ).
2. The tee type connector pipe manufacturing method of claim 1 , wherein, in the step S- 1 , a diameter (d) of the straight pipe ( 20 ) is formed of 147 mm˜149 mm, and the molding hole is formed with a minor axis diameter (b) of 57.8 mm˜58.5 mm and a major axis diameter of 120.9 mm˜121.9 mm.
3. The tee type connector pipe manufacturing method according to claim 2 , wherein, in the step S- 7 , the press device ( 500 ) raises the molding stone ( 300 ) to tension around the molding hole ( 11 ) at a pressure of 1 TON and a speed of 0.05 m/s, and then forms the molding pipe part ( 31 ).