The method of structural synthesis for computer design of technological processes of manufacturing of machine parts of rolled metal

Abstract

Found that the technological capabilities of modern equipment thermal cutting sheet material, equipment for cutting rectangular parts on the guillotine shears and cut-ting round and profile rolling machines to split greatly enhanced. This allows in many cases to machine holes, windows, paths details conclusively drawing with a certain level of accuracy and surface roughness. No mechanical impact on the processed material, the possibility of cutting complex contours of parts from sheet material with the required accuracy the mutual arrangement of the cut-out circuits are sending a blank using the methods in conjunction with thermal cutting machining operations in a single process. Therefore there is a need to develop new technological solutions that ensure compliance with the principle of maximum concentration of operations. And their implementation in CALS-technologies by combining operations thermal cutting and subsequent ma-chining with computer aided design technology method of structural synthesis in a single integrated system. The aim of this work was to develop a method of structural synthesis for computer design of technological processes of manufacturing of machine parts of rolled metal. The paper describes a method of structural synthesis used in CALS-technologies in the design of technology of making parts from metal, based on the use of design-technological elements (DTE). DTE is the elementary surface (plane, cylinder, etc.) or a set of elementary surfaces having a common, constructive purpose (chamfer, notch, etc.) and characterized by common route of manufacture. For each DTE geometric parameters (geometrical dimensions, roughness, etc.), processing technologies (routing, operations, transitions) and conditions select the required option processing technology. Any item made of metal, can be represented as a set of its DTE. Design-engineering part model is a collection of its constituent DTE. On the basis of actual values of geometric parameters for each DTE there is a choice of the required variant of the technology of its processing. The article presents the boundary conditions of the select operations in tehnologicheskie thermal cutting processes, the technique of experimental researches allowed to determine these conditions. Given a statistical model of the thermal cutting operations. The article proposed a method of determining a preferred variant of technological route based on graph theory. The method allows to choose the rational option of manufacturing technology of parts made of metal with a minimum of complexity with the maximum concentration of operations at one workplace.