LPHY caster wheels manufacturer specialized in customized office chair caster wheels for more than 25 years
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LPHY caster wheels manufacturer specialized in customized office chair caster wheels for more than 25 years
LPHY is a professionalcasters manufacturer
>The traditional repair method is to weld the steel sleeve directly to the outer wall of the heavy-duty swivel caster to reinforce it. The production process of the heavy-duty swivel caster will prevent various defects of the heavy-duty swivel caster. The traditional repair method is not only difficult to operate and more risky, but also for various defects of the heavy-duty swivel wheel with irregular shape. The traditional repair method is to directly weld the steel shell to the outer wall of the heavy-duty swivel wheel to strengthen it. . The operation is difficult and risky, and it is impossible to implement bends and pipe sections with irregular shapes and have to stop the pipeline for replacement.
The epoxy steel shell composite casing technology developed by a pipeline safety evaluation and technology development center for many years can completely solve this problem, and can effectively inhibit the aggravation of the corrosion process in the pipe. Maintenance-free permanent repair under the Pipeline transportation of petroleum and its finished fluids (such as gasoline, kerosene, diesel, etc.) and natural gas is the most economical and reasonable way of transportation, but the medium in such pipelines is flammable, explosive and toxic. Therefore, safe operation is very important. Especially since the 1950s, with the laying of a large number of oil and gas pipelines in various countries around the world, pipeline accidents have occurred from time to time, and some even caused catastrophic consequences.
Heavy-duty swivel wheels also do not require frequent replacement for reinforcement repairs. At the same time, due to the good chemical resistance of epoxy filler, the thinning of the pipe wall or the corrosion perforation caused by the internal corrosion of the pipe can effectively inhibit the aggravation of corrosion. Advances in analysis technology for rolling processing of heavy-duty universal wheels The finite element method has been widely used since the late 1980s (FEMZ has recently been accompanied by the development of computer output, and the analysis technology has changed from two-dimensional to Development of advanced deformation analysis in 3D.
As a result, the dimensional accuracy and quality of the products have been improved. The following are representative analysis techniques. Analytical techniques for stretch rolling Mandrel rolling mills use mandrels and grooved rolls for rolling, so unlike plate rolling, there is a free deformation zone in the circumferential direction of the rolls where the rolls and mandrels do not come into contact. Since this free deformation zone is rolled on the next stand, it is important to predict the deformation including the free deformation zone in order to correctly understand the comprehensive characteristics of the mandrel mill. This complex deformation prediction High precision cannot be obtained by using the conventional cache implementation algorithm, so high precision analysis is required.
Considering the shear deformation in the rolling direction, an approximate 3D analysis was performed using a normal expansion surface deformation analysis. The results show that the calculated values are in better agreement with the experimental values. In recent years, with the development of computer technology, the development of the complete three-dimensional finite element method analysis technology has been accelerated, and it can also be used for the analysis of the effect of tension between the stands and the analysis of the speed difference between the roll and the tube blank.
Analytical technology of sizing rolling When using sizing rolling, there is no tool on the inner surface, so the shape of the inner surface of the rolled material is not uniform when rolling thick-walled tubes. When using a three-roll mill, the shape of the inner surface of the rolled material is hexagonal. Through the analysis of three-dimensional finite element method, the occurrence mechanism and countermeasures of this inner surface edge and corner phenomenon are clarified.
When ellipticity = 0.986 passes close to a perfect circle, a substantially uniform wall thickness can be obtained, but when the pass is close to perfect circle ellipticity = 0.960, sharp interior hexagonal corners appear.
