| Process of producing elbow by cold push elbow machine
What factors will affect the shape of the cold push elbow forming process? Through the research of the relevant staff, the influences of billet, mandrel, temperature and propulsion rate on the radius of curvature of the elbow and the non-roundness of the section on the wall thickness are studied, and the following conclusions are drawn:
D/Dp (elbow section diameter/blank outside diameter) = 1.33 ~ 1.40; b/a (mandrel elliptic section major axis/mandrel elliptic section minor axis) = 1.06 ~ 1.10;
The heating temperature of WB36 material is 880 ~ 900℃; the heating temperature of A335 P22 material is 900 ~ 920℃; Propulsion rate ≤1000δ/2D (δ -- elbow wall thickness, D -- elbow section diameter).
The important parameters of the shape of cold push elbow machine are the radius of curvature R, the section irroundness perpendicular to the radius of curvature circle and the wall thickness. The technological parameters of the shape of the elbow are as follows: the material of the blank, the wall thickness and outside diameter, the material and shape of the mandrel head, the heating temperature and its diffusion and the propulsion rate.
What are the differences between cold elbow machine and hot elbow machine? Cold push elbow machine is also known as stainless steel elbow machine, in the past, the supply of stainless steel, alloy steel elbow urgent, it appears in order to satisfy the production of stainless steel, alloy steel elbow necessary development, but also to meet the special requirements of the production of carbon steel elbow.
The cold push elbow machine and the hot push elbow machine are also different. In addition, the cold push elbow machine does not need to accept the intermediate frequency coil heating, so as to save electricity, energy saving and health.
In the time of pushing elbow, the tube blank should be sawed down to cut the material. The shape of the tube blank is trapezoidal, but there is a difference between the hot pushing elbow machine and the cold pushing elbow machine. In addition, the tube blank of the hot pushing elbow machine is rectangular.
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