Technology for producing hollow steel by hot squeeze method
A production process, hot extrusion technology, applied in metal extrusion forming tools, metal extrusion, manufacturing tools, etc., can solve the problems of poor steel shape and geometric size, low material utilization rate, non-metallic inclusions, etc., to achieve Improvement of the force condition, high quality of the inner hole, and the effect of increasing the strength
Inactive Publication Date: 2007-05-23
山东凿岩钎具有限公司
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Problems solved by technology
The hot piercing and hot rolling method has a simple process and a high yield, but due to the absence of a core, the inner diameter will inevitably be deformed during the reduction and hot rolling process, resulting in poor quality of the inner hole
Cast pipe core rolling method is widely used in my country, but due to small ingot shape and small compression ratio, there are metallurgical defects such as shrinkage cavity, porosity, non-metallic inclusions, etc., and the steel shape and geometric size are poor
The mechanical drilling method is rolled by a special hollow steel rolling mill, and the geometric size is better, but it inevitably has the defect of low material utilization rate, and the yield is only about 78%, resulting in high manufacturing cost.
[0003] The hot extrusion method is the most advanced production technology in domestic and foreign pipe making, but the mandrel of the complete hot extrusion method is subjected to high temperature stretching and strong friction stress during the extrusion process, and it will break if it is too thin. Therefore, there is no precedent for using mandrels smaller than Φ60mm in China
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[0012] As shown in the accompanying drawings, the present invention relates to a new process for producing hollow steel using a hot extrusion machine. Firstly, the electric arc furnace is used to make steel. Lose. Centrifugal casting is then carried out to rotate the molten steel, and a middle hole is naturally formed in the middle of the billet. The casting has a precise structure and no structural defects such as trachoma, pores, and looseness. Then, the temperature is precisely adjusted through the industrial frequency furnace to create conditions for the best extrusion force during extrusion, while avoiding the coarse structure of the billet. The billet temperature is preferably 1150--1200°C. Before extrusion molding, first place the billet 4 with the middle hole on the hot extrusion body, wrap the floating mandrel 1 outside the sheath 3 and put it into the extrusion head 2, and the sheath 3 can be made of 3Cr2W8V material . In order to facilitate core pulling, the leng...
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A technology for manufacturing hollow steel by hot extrusion method includes such steps as perforating a blank, heating and extruding by the hot extruder which has a float mandrel and its protecting sleeve for inserting them into the pre-made hole on the blank. Its advantages are small hole diameter (the smallest hole down to 5 mm), high extruding speed and productivity, and high utilization rate of material (90% or more).
Description
technical field [0001] The invention relates to a hollow steel hot extrusion production method, in particular to a hollow steel manufacturing process combining a hot extrusion method, a floating mandrel and a drawing method. Background technique [0002] Hollow steel manufacturing processes at home and abroad mainly include hot piercing and hot rolling, cast pipe core rolling and mechanical drilling. The hot piercing and hot rolling method has a simple process and a high yield, but because there is no core, the inner diameter will inevitably be deformed during the reduction and hot rolling process, resulting in poor quality of the inner hole. Cast pipe core rolling method is widely used in my country, but due to small ingot shape and small compression ratio, there are metallurgical defects such as shrinkage cavity, porosity, non-metallic inclusions, etc., and the shape and geometric size of steel are poor. The mechanical drilling method is rolled by a special hollow steel r...
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IPC IPC(8): B21C23/00B21C25/00
Inventor 李明锁张乐林
Owner 山东凿岩钎具有限公司