The Research And Development Of Welding Bar Screen Of Vibrating Screen

Vibrating screening equipment is widely used in metallurgy, coal, mining, cement and other industries, while the sieve is one of the key parts to ensure that the shaker normal use. In recent years, there has been a new type of rod sieve. Spring steel is main component of this kind of sieve plate. Now the structure of the article great sieve is:one side of spring steel bar wear into the hollow steel, with layering pressure fixed; another side is for free impending state, can free vibration. There are two major problems in practical production. If the two holes in the hollow steel is not a straight line, it will lead to inconvenient to install or cause the installation to be unreliable and unexpected situations such as loosening or breakage caused by the sieve in the course of their work.In this paper a new type of welding rods sieve be studied. This sieve size spring steel bars welded directly on the plate in accordance with the relevant size requirements, so as to solve the aforementioned bars perforation of the installation process of. Bars need high yield strength and fatigue limit to ensure wear resistance and resistance to fatigue fracture of the sieve ability. Sieve framework requires good toughness and welding ability. Therefore, spring steel is chose as the material of bars and ordinary carbon steel is selected as sieve frame material, it is dissimilar metal welding between those two materials. Welding is more difficult due to the difference of chemical composition and physical properties. If you cannot take a good process, it will generate crack, hardened tissue. In this paper, we have studied the preheat and post weld heat treatment process of65Mn,60Si2Mn60Si2Cr three kinds of spring steel bar bar and Q235steel. The main contents include:the selecting of electrode composition according to the parent material composition; prior to welding preheating parent metal at200℃,300℃,400℃,preheating time of30min; after soldering immediately tempering at250℃,300*,350℃,400℃,450℃,tempering for2h.Using the metallurgical microscope to observe the microstructure of each specimen, we can analyze the organizational change under different process. And we test the hardness and fatigue limit of each group of specimens. We analyze the above data to come to the relationship between microstructure and mechanical properties and the optimized heat treatment process.Experimental results show that:Wire selection node506low hydrogen potassium type wire; The best process is the preheating temperature is300℃, holding time of30min, the tempering temperature of450℃, holding time2h.In order to meet the actual production and economic requirements, compared to the three materials. Found that the fatigue life of sieve plate made by65Mn spring steel is the shortest one, sieve plate made by60Si2Mn is second one, sieve plate made by60Si2CrV is longest one. However, considering economic and practical performance, sieve plate made by60Si2Mn is the most appropriate.The sieve made by60Si2Mn is used in mining machinery. This sieve life is equal to the sieve of the original structure. Their life is greater than three months.