51 steel pipe network to provide the latest knowledge: squeeze the pipe must be lubricating parts are: extrusion die, extrusion tube and mandrel three parts.
(1) Lubrication of Extrusion Dies: Lubrication of molds is a common method of pressing glass powder into a glass mat, that is, placing the glass mat between the mold and the blank before extrusion. In order to ensure that the glass mat can continuously soften on the friction surface, the shape of the glass mat is required to match the shape of the entrance cone of the die hole and the end of the blank. The outer diameter of the glass mat is generally 3 to 5 mm smaller than the diameter of the barrel. The diameter of the hole in the glass mat is less than or equal to the diameter of the die hole. The thickness of the glass mat generally takes 4% to 8% of the length of the blank.
(2) Removal of the glass film on the surface of steel tube: Due to the glass lubricant used in the extrusion, a glass film with a thickness of 20 to 50 μm remains on the inner and outer surfaces of the extruded tube, which is hard and brittle and harmful to subsequent processing and use. Must be cleared. Removal methods include mechanical and chemical methods. Mechanical methods include shot peening, water cooling, and tension straightening. When the glass film is removed by a chemical method, since the residual glass lubricant on the surface of the steel tube has a high chemical stability, it is necessary to use an alkali solution or an acid solution to remove it. The disadvantage of the pickling method is that it is highly corrosive to various steel pipe materials and may cause excessive pickling on the surface of the steel pipe, which is particularly corrosive to carbon steel, and therefore has limited application. Currently using acid-base joint removal method.
(3) Lubrication of squeeze tube and mandrel: Lubrication of squeeze tube and mandrel shall be done by using glass powder with low softening point and small particle size coated on the inner hole and outer surface of the steel billet. In addition, it is also possible to wrap glass cloth around the surface of the blank and wind the glass cloth around the core rod.
The above steel pipe knowledge is published by 51 steel pipe network, learn more to: http://?id=3
(1) Lubrication of Extrusion Dies: Lubrication of molds is a common method of pressing glass powder into a glass mat, that is, placing the glass mat between the mold and the blank before extrusion. In order to ensure that the glass mat can continuously soften on the friction surface, the shape of the glass mat is required to match the shape of the entrance cone of the die hole and the end of the blank. The outer diameter of the glass mat is generally 3 to 5 mm smaller than the diameter of the barrel. The diameter of the hole in the glass mat is less than or equal to the diameter of the die hole. The thickness of the glass mat generally takes 4% to 8% of the length of the blank.
(2) Removal of the glass film on the surface of steel tube: Due to the glass lubricant used in the extrusion, a glass film with a thickness of 20 to 50 μm remains on the inner and outer surfaces of the extruded tube, which is hard and brittle and harmful to subsequent processing and use. Must be cleared. Removal methods include mechanical and chemical methods. Mechanical methods include shot peening, water cooling, and tension straightening. When the glass film is removed by a chemical method, since the residual glass lubricant on the surface of the steel tube has a high chemical stability, it is necessary to use an alkali solution or an acid solution to remove it. The disadvantage of the pickling method is that it is highly corrosive to various steel pipe materials and may cause excessive pickling on the surface of the steel pipe, which is particularly corrosive to carbon steel, and therefore has limited application. Currently using acid-base joint removal method.
(3) Lubrication of squeeze tube and mandrel: Lubrication of squeeze tube and mandrel shall be done by using glass powder with low softening point and small particle size coated on the inner hole and outer surface of the steel billet. In addition, it is also possible to wrap glass cloth around the surface of the blank and wind the glass cloth around the core rod.
The above steel pipe knowledge is published by 51 steel pipe network, learn more to: http://?id=3
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