RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). reassignment GM GLOBAL TECHNOLOGY OPERATIONS, INC. Assigned to GM GLOBAL TECHNOLOGY OPERATIONS, INC. AS AGENT FOR HEDGE PRIORITY SECURED PARTIES SECURITY AGREEMENT Assignors: GM GLOBAL TECHNOLOGY OPERATIONS, INC. AS AGENT FOR BANK PRIORITY SECURED PARTIES reassignment CITICORP USA, INC. AS AGENT FOR HEDGE PRIORITY SECURED PARTIES, CITICORP USA, INC. Publication of US20070090569A1 publication Critical patent/US20070090569A1/en Application granted granted Critical Publication of US7370504B2 publication Critical patent/US7370504B2/en Assigned to UNITED STATES DEPARTMENT OF THE TREASURY reassignment UNITED STATES DEPARTMENT OF THE TREASURY SECURITY AGREEMENT Assignors: GM GLOBAL TECHNOLOGY OPERATIONS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). ![]() Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by GM Global Technology Operations LLC filed Critical GM Global Technology Operations LLC Priority to US11/255,733 priority Critical patent/US7370504B2/en Assigned to GM GLOBAL TECHNOLOGY OPERATIONS, INC. Original Assignee GM Global Technology Operations LLC Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Bruggemann Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Active, expires Application number US11/255,733 Other versions US20070090569A1 Google Patents Method of making variable thickness tubular member for vehiclesÄownload PDF Info Publication number US7370504B2 US7370504B2 US11/255,733 US25573305A US7370504B2 US 7370504 B2 US7370504 B2 US 7370504B2 US 25573305 A US25573305 A US 25573305A US 7370504 B2 US7370504 B2 US 7370504B2 Authority US United States Prior art keywords tubular member die set forth tubular thickness Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US7370504B2 - Method of making variable thickness tubular member for vehicles Some foreign manufacturers believe that perforation of the rotating bite on the tube has a certain self-aligning effect.US7370504B2 - Method of making variable thickness tubular member for vehicles However, over the past decade or so, with the improvement of technology and equipment, fewer and fewer units are equipped with heat-set centers. At the same time, a good centering hole size can be obtained because the shape of the punch matches the shape of the tip nose. ![]() This method is highly efficient, has no metal consumption, is simple in equipment and has a wide range of applications. Heat centering is in the tube heating, with compressed air or hydraulic punching in the hot state, the device is set at the piercing machine at the front desk. ![]() The purpose of centering is to facilitate the perforation of the nose nose aligned tube axis to prevent the bud when the perforation biased to reduce the uneven thickness of the front end of the capillary while improving the oblique rolling fL bite bite conditions so wear fL process Smooth progress. Therefore, the pressure before the hole extrusion, ingot or billet to be shaped cross-piercing, round billet to be centering. ![]() In order to ensure that the wall thickness of steel pipe is uniform, the center axis of the tube must be punched.
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