Glass lubricant seamless hot extrusion production application

The disadvantage of graphite lubricant are: ` large thermal conductivity, poor insulation, mold temperature rise of large, fast-wear, long product extrusion difficult. a prone products Carbon, when squeezed prone to intergranular corrosion of stainless steel, it is necessary to remove the carburized layer after extrusion, resulting in increased metal consumption. b often cause environmental pollution.

Compared with glass graphite lubricant, its advantages are: ` glass thermal conductivity, to prevent excessive cooling the billet surface, but also can play a protective role tooling. a has good lubricating properties, can be large extrusion ratio and increase extrusion speed, which can expand the range of products the extruder. b glass lubricants, chemical stability, without causing tissue defects. c glass lubricant can easily change ratio, to achieve different physical properties (such as softening point, viscosity, etc.), in order to adapt the extrusion of different materials required. d can be kept clean when glass is used as a lubricant. In short, glass lubricants significant advantages. Many studies indicate abroad, using glass extrusion steel best lubricant effect.

Extrusion steel parts must be lubricated are: extrusion molding, extrusion mandrel tube and three parts.(1) extrusion die lubrication: mold lubrication method commonly pressed into the glass frit glass mat, i.e. before pressing the glass mat is placed between the mold and the billet. In order to ensure continuous glass mat to soften the friction surface, the desired shape and mold hole inlet cone and the shape of the glass mat blank ends coincide. Glass mat diameter is generally smaller than the diameter of the extruder barrel 3 ~ 5mm. Glass mat bore diameter of less than or equal to the diameter of the die hole. Thickness of the glass mat generally take 4% to 8% of the length of the blank.(2) extrusion cylinder and the mandrel lubrication: extruded tube and the mandrel lubrication should be used in a low softening point, the small size of the glass powder is applied to the hole and the outer surface of the slab. In addition, you can also use glass cloth wrapped around wrapped in the billet surface and the glass cloth wound around the mandrel method.(3) removing the steel surface glass film: As the use of glass lubricant during extrusion, extrusion residual glass film on the inner and outer surfaces of carbon steel pipe with a thickness of 20 ~ 50μm, which is hard and brittle nature, detrimental to subsequent processing and use It must be removed. Clear methods include mechanical and chemical methods. Mechanical methods have shot, water and stretch straightening methods. Applied Chemistry Law Clearing glass membrane, since the pipe surface residual glass lubricant has a high chemical stability, it needs to remove alkali solution or an acid solution. Inadequate pickling lies in aggressive various steel materials is large, it may make steel pickling surface, especially the larger and erosion of carbon steel, and therefore subject to restrictions on use. PH joint clearance method currently used.