Multidirectional combined extrusion molding method for large-size annular preventer

• Main Authors: GUO YUXI, JIN MIAO, LI YUJIE, SONG LEIJUN
• Format: Patent
• Language: English
• Published: 16.12.2015
• Subjects: AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL; MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; PERFORMING OPERATIONS; PUNCHING METAL; TRANSPORTING

The invention discloses a multidirectional combined extrusion molding method for a large-size annular preventer. An extrusion mould is adopted, wherein the extrusion mould comprises an upper penetrating needle, a concave mould, an upper annular extrusion mould and a lower penetrating needle; the upper penetrating needle and the lower penetrating needle are respectively located above and under the middle part of the concave mould; the upper annular extrusion mould sleeves on the outer side of the upper penetrating needle. During an extrusion process, a method for quickly matching the upper penetrating needle with the upper annular extrusion mould is adopted, so that a mould cavity on a high rib at the bottom of a flange is full of the material, the happening of defects such as folding is avoided, the quality of products is increased and the use ratio of the material is increased.