| The characteristics of the new elbow pushing machine
Elbow pusher machine is the traditional product of our company's pipe fitting equipment, mainly used to produce various diameter and wall thickness elbow pipe fittings with curvature radius 1-2.5D. With the company's technology research and development of steel pipe equipment, elbow machine has been advanced technical improvement. Double control of elbow machine installation operation platform, while increasing the raw material steel pipe hydraulic clamping and other automatic operation technology, elbow machine corresponding to the manufacture of four cylinder extra-thick elbow pipe push machine and other hydraulic push equipment. Elbow machine equipped with intermediate frequency power supply operation control system, can realize one person operation control operation, energy saving, safe operation and other functions.
In recent years, with the development of shipbuilding and petrochemical, gas and other industries, as a liquid, gas pipeline elbow has been widely used. When the pipe is bending, the bearing pressure on the inside and outside of the pipe wall is different due to the different mechanical properties of the inside and outside of the pipe wall. Elbow, as one of the main connecting parts in piping system bending, is related to the operation of the whole system, so the structural design of elbow is very important. Improving the forming level and productivity of elbow is the main content for pipe fitting manufacturing enterprises to accelerate the pace of key technology transformation. By using the ABAQUS finite element simulation software of numerical simulation, and combining the test method of heat of elbow push into processes of system simulation, good forming process parameters are proposed according to the simulation results, and analyzes the process parameters (such as push system temperature, push speed, friction coefficient) of the influence of bend forming process.
The main research contents and results are as follows:
Involute of variation as the forming mandrel hole enlargement section of central axis, its main design thought is infinite radius of curvature decreases to the calibration period of radius of curvature, which facilitates the flow of metal in the process of expanding, the elbow inner arc metal material to flow to the outer arc fully, so as to avoid the hot pushing elbow bend the elbow lateral tensile machine deformation thinning, compression of the medial thickening of the wall thickness Uniformity ensures the roundness of outer diameter and uniformity of wall thickness.
The control variable method is used to optimize the design of the central axis, and the optimal design is selected for simulation.
The forming process of elbow under different technological parameters was simulated by using finite element simulation software Abaqus and orthogonal test method. The simulation results show that too high pushing temperature will lead to wrinkling easily, too low will lead to cracking
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