MUMBAI, India, Oct. 5 -- Intellectual Property India has published a patent application (202531030978 A) filed by Bharat Heavy Electricals Limited on March 29, 2025, for A Method And Double Die For Multi Draw Of Tube In Single Stage.
Inventors include Ulaganathan Selvam; Selvaraj Gopal; Mathaiyan Dhanabal; Narayan Kumar; and Natrajan Ramanathan.
The application for the patent was published on October 02, 2026, under issue no. 40/2026.
Abstract: WE CLAIM: 1. A method for multi draw of tube in single stage to reduce cycle time comprising steps of: -pickling of tube; -pointing; -drawing; -heat treatment; - straightening; -end cutting; wherein -first stage pointing in one end of tube carried out for 2nd Die of big size (003) followed by second stage pointing in one end of the tube for 1st Die of smaller and final size (002); -inserting a final outer diameter (OD) size Die (002) into body parts (017) of draw bench machine; -inserting big outer diameter (OD) size Die (003) into the body parts (017) of the draw bench machine; -fitting of die Housing (001) to the draw bench body parts (017); -fitting of feed in ring (004) into the hole of the body parts (017) of the draw bench; -placement of multiple lock plates (005) with its hole matching with the housing holes; -insertion of plurality of fasteners (006) into the holes of feed ring (004) followed by said drawing of the tubes. 2. The method as claimed in claim 1, wherein the Housing (001) is fitted to the draw bench body parts (017) with stud and nuts (007). 3. The method as claimed in claim 1 or 2, wherein the fasteners including bolts (006) are inserted into the holes of the feed ring (004). 4. The method as claimed in claims 1-3, wherein the second stage pointing diameter is 02mm to 03mm less than the final die size (002) that it inserts into the die easily. 5. The method as claimed in claim 1, wherein a tube is fed into plug and plug rod assembly which is in rotating drum from loading tray through roller conveyor and feeding unit, in which the drum rotates in downward direction, wherein the pointed end of the tube is inserted into the double die assembly which is gripped by gripper jaw in carriage unit, in which the drawing process takes place by pulling action exerted chain drive. 6. Double die for multi draw of tube in single stage comprising of a housing (001) accommodating 1st Die (002) of finishing size and 2nd Die (003) of 1st stage drawing, wherein feed in ring (004) is attached to the housing (001) together with multiple lock plates (005) for tightening the feed in ring (004). 7. The Double die for multi draw in single stage as claimed in claim 6, wherein a plurality of fasteners including lock nuts (006) are tightened that, the die cannot come out during drawing.
Disclaimer: Curated by HT Syndication.
