The Scheme Design And Host Structure Analysis Of The Thick Wall Head Stamping Forming Equipment

Head is an important component part in pressure containers, such as boilers, oil refining and chemical industry equipment. Head can be divided into flat head, dished head, ellipse head and spherical head according to its shape. Head is typical artifacts of thick plate forming. Consider the deformation resistance, residual stress and mold material selection for the plate forming, so over the years the domestic always use hot stamping and sometimes use cold or warm forming. The research of hot stamping equipment will effectively improve the production quality and efficiency of head, so to improve the manufacture efficiency and use quality of pressure vessel.Based on the analysis on the different methods of head forming, put forward the hot stamping process plan and process diagram according to the usage and the actual process of the requirements. And then analyze a variety of host structures in a combination of a large number of head stamping materials both at home and abroad. According to the advantages and disadvantages for the different structure of the host, we select pre-stressed press of three beam and four-column as its host structure. In addition we put forward the hydraulic system and control request by analyzing of process action. Hydraulic system is divided into the main system, auxiliary system, liquid circulation system and control oil system according to the function: the main system is used to complete the control and drainage for action of the main oil cylinder, auxiliary system is used to complete control of the ejection device and movement, liquid circulation system provides the oil filter, circulating and cooling of the whole system, control oil system provides all control oil of the proportional valve and hydraulic control valve. Four parts unified the whole hydraulic control system of the equipment through the electrical control.After fulfilling the principle scheme, the relation between the workpiece forming size and tensile force and blank-holder force is derived. Set the largest workpiece as the target, calculation of the maximum tensile force and blank-holder force for main oil cylinder. And according to the process to determine the oil cylinder stroke, then ensure the oil cylinder type selection. Comparative the domestic stamping speed selection, we choose the speed limit, the pump, valve and fuel tank size is determined. In particular, the pump source of the primary system can be divided into two parts, one part through multiple sets of liquid valve connect oil cylinders, to meet the maximum speed of the requirements. The oil flow rate required by the slider is greater than the first part of the pump source because of the maximum requirement of the main slider output and the demand of higher compression rate, so we need to use another part of the pump provide for main slider down action specially. In the layout, considering the overall layout firstly, reasonable arrange the position of the host, heating furnace and mold, to use the plant reasonably and ensure the process action can be realized high efficiency. And then consider the structure of the device, complete the layout of pump room, control room and operation room.In the scheme design of hydraulic components, complete the 3d design of hydraulic components from top to bottom and design based on the thinking of modular and parametric. In the design of valve body we adopt the minimum channel wall thickness size, to reduce the body parts space and quality for optimizing model. By means of pressure and displacement closed loop control to realize intelligent control which use of manual and automatic two gears.According to the nominal pressure requirements, reference for the similar tonnage host size to design the oil cylinder, column, bar and beam, and the key size intensity is checked. In this paper we build the 3D model by Solidworks. After pretreatment of the overall frame model it leaded into finite element analysis software. At the same time, deal with the boundary conditions of contact, friction and load. And establish the host machine three-dimensional analysis model of the ontology structure, to implement the whole numerical simulation analysis of body structure.Based on the calculation of machine 3d model, we obtained the stress and displacement distribution of the host structure under common conditions, and equivalent stress map of host components are given. Then its overall performance is analyzed and evaluated.This paper provide a quantitative analysis basis for the overall scheme determination and technology of equipment design, the analysis of the structure for host frame provides strong credentials to complete the largest workpiece security and stability.