A method for lubricating the outer mold of hot-extruded steel pipe
An extrusion die and hot extrusion technology, which is applied in the field of lubrication of the outer die of hot extruded steel pipes, can solve the problems of scrapping, the metal entry arc section is easy to stick to metal, etc., and achieve the effect of eliminating the possibility of bonding and improving the service life.
Active Publication Date: 2016-08-24
宝武特种冶金有限公司
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Problems solved by technology
[0006] The purpose of the present invention is to provide a lubricating method for the outer mold of hot-extruded steel pipes, which solves the problem that the metal inlet arc of the extrusion die is easily stuck to metal and is scrapped when the steel pipe is extruded, improves the service life of the extrusion die, and improves the outer surface of the pipe. Surface Quality
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[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0020] see figure 2 , image 3 , a method for lubricating a hot extruded steel pipe outer mold of the present invention, comprising the steps of:
[0021] 1) Design the transition section between the flat section 61 of the extrusion die 6 and the sizing belt 62 as a groove 63, place a glass ring 7 in the groove, and the contact surface between the glass ring 7 and the extrusion die 6 should be free of The gap, the non-contact part with the extrusion die is a circular arc transition; the glass pad 5 for end face lubrication is fixed on the end face 61 of the extrusion die 6 of the extrusion die 6; the inner diameter D1 of the glass pad 5 for end face lubrication of the extrusion billet is larger than the Die 6 groove diameter D2 is 10-20mm larger;
[0022] 2) Close and lock the end face of the extrusion cylinder 4 and the end face of the ext...
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The invention relates to a method for lubricating a hot extrusion steel pipe external mold. The method comprises the following steps: (1) designing a transitional section between a plane section and a calibration bench of an extrusion mold to be a groove, placing a glass circular ring into the groove, and fixing a glass mat for lubricating the end surface onto the end surface of the extrusion mold, wherein the contact surface between the extrusion mold and the glass circular ring is seamless, the non-contact part between the extrusion mold and the glass circular ring is in circular arc transition, and the inner diameter of the glass mat for lubricating the end surface of an extrusion blank is 10mm to 20mm greater than that of the groove of the extrusion mold; (2) locking the end surface of an extrusion barrel with the end surface of the extrusion mold; and (3) loading the heated blank into the extrusion barrel for extruding. According to the method, the problem that an extrusion mold is rejected because metal is easily adhered onto a metal entrance arc section of the extrusion mold when a steel pipe is extruded in the mold can be solved, the service life of the extrusion mold is prolonged, and the appearance quality of the pipe is improved.
Description
technical field [0001] The invention belongs to the technical field of metal plastic processing lubrication, in particular to a method for lubricating an outer mold of a hot-extruded steel pipe. Background technique [0002] Hot extrusion is a widely used method for producing difficult-to-deform, high-alloy pipes. see figure 1 , the metal is in a three-dimensional compressive stress state in the closed cavity formed by the extrusion cylinder 4, the extrusion pad 2, the mandrel 1, the extrusion die 6 and other tools, which is conducive to giving full play to the plasticity of the metal, making the difficult-to-deform material Large plastic deformation can be obtained, and under the action of the axial pressure provided by the extrusion rod, the metal flows out into the annular gap formed by the extrusion die 6 and the mandrel 1 to form a pipe. [0003] The outer surface of the pipe is formed by the outer surface of the blank 3 sliding along the surfaces of the extrusion cyl...
Claims
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IPC IPC(8): B21C23/32
Inventor 范永革孙振华李亚鑫
Owner 宝武特种冶金有限公司