Manufacturing process to make a valve ball

Abstract

A manufacturing process to make a valve ball includes the following steps: a) prepare a plurality of flat circular metallic plates; b) put the plate one by one into a pair of first molds and is punched into a top hat shaped piece; c) put the top hat shaped pieces individually into a pair of second molds and is punched an opening in the top of the crown and a rectangular indentation in a circumference of the brim; d) put the punched top hat again into a pair of third molds and where is punched into a hemi-spherical shaped piece; e) combine pair by pair of the hemi-spherical shaped pieces together with their rectangular indentations facing each other to form a rectangular retaining through hole, then connected by welding means. So that a qualified valve ball is therefore finished after the conducting of trimming, smoothing and polishing steps.

1 . A manufacturing process to make a valve ball comprising the following steps: 
 a) preparing a plurality of flat circular metallic plats;    b) putting said plates one by one between a first upper and lower mold of a punching machine;    c) punch said plate into a top hat shaped pieces which has a crown and a brim;    d) putting said top hat shaped piece into a second upper and lower mold where said crown is punched an opening and said brim is punched a rectangular depression in a circumference;    e) putting said punched top hat shape piece between a third upper and lower mold of a punching maching where said top hat is punched into a hemi-spherical shaped piece which has an opening in top abutting a tubular inner wall an a rectangular indentation in a rim;    f) combining said hemi-spherical shaped pieces pair by pair together to form a semi-finished valve ball and connected by welding means;    g) trimming and smoothing weld seam on said valve ball;    h) polishing outer surface of said valve ball in a polishing machine which has a rotatable rod inserted through a central passage way of said valve ball and an introrse surface engaged with the outer surface of said valve ball;    whereby, a qualified valve ball is finished including an inner passage way between said openings and rectangular retaining through hole in a middle periphery.    
   
   
       2 . The manufacturing process as recited in  claim 1 , wherein said first upper mold has a cylindrical central depression and said first lower mold has a cylindrical punch slidably disposed within a central bore engageable with the central depression of said first upper mold.  
   
   
       3 . The manufacturing process as recited in  claim 1 , wherein said second upper mold has a cylindrical central bore engageable with a cylinder punch of a second lower mold thereof;  
   
   
       4 . The manufacturing process as recited in  claim 1 , wherein said third upper mold has a central post surrounded by a ¼ circular groove and said third lower mold has a cylinder punch slidably disposed in a central bore thereof, said punch has a central depression engageable with the central post and a round top engageable with the groove of said third upper mold.