APPLICATION OF FUNCTIONAL-TARGET ANALYSIS TO CHOOSE THE CLASSIFICATION FEATURES OF A SELF-TAPPING SCREW

Abstract

Classification and systematization of metal products with a wide range of standard sizes and numerous design features, in particular, various types of hardware products, is a necessary condition for the regulation of their indicators in normative and technical documentation and one of the key aspects to use the computer technologies to solve tasks of modern manufacturing. Analysis of the domestic market of hardware products indicates a significant content of fasteners, including self-tapping screws manufactured by European and Asian companies, which are not subject to mandatory certification and are supplied either according to foreign standards (ISO, DIN, DIN EN, etc.), or in branded versions, which enhances the relevance of activity for their systematization and classification. To select classification features, it is proposed to use a functional-target analysis based on the definition of useful functions of the analyzed object. As classification features of self-tapping screws, it is proposed to use their main structural elements: the shape of the head, the type of thread and point, the shape of the slot, etc. The main structural elements of the self-tapping screw, regulated in the actual normative and technical documentation, are presented in the form of general classification schemes. The proposed classification of self-tapping screws can be used as for the development of normative and technical documentation of this type of fasteners and for technological processes of its production, designing new types of screws.