Metrology Course Project, Standardization and Certification of JPOs

Contents

INTRODUCTION

1 CALCULATION AND SELECTION OF FIT FOR SMOOTH CYLINDRICAL JOINT

2 CALCULATION AND SELECTION OF ROLLING BEARING FITS

3 CALCULATION AND SELECTION OF KEYWAY JOINT FITS

4 CALCULATION OF SPLINED JOINT FITS

5 LINEAR DIMENSION CHAIN CALCULATION

LIST OF SOURCES USED

Project Description

The course work includes a calculation explanatory note on 25 pages of computer text, it contains 4 tables, 2 figures, a list of the used literature of 5 sources and a graphic part on 5 sheets of A3 format.

Keywords: fit, deviation, size, gap, fit tolerance, tolerance field, roughness, bearing, error, measurement, key connection.

Calculation of dimensional characteristics of the following joints: smooth cylindrical, bearing, key, splined. And the linear dimension chain was calculated by the method of complete interchangeability.

The graphic part shows the connection drawings and the location of the tolerance fields.

Introduction

In order to increase the technical level and quality of products, increase labor productivity, save labor and material resources, it is necessary to develop and improve standardization systems in all sectors of the national economy based on the introduction of science, technology and practical experience.

It is necessary to strengthen the effective and active influence of standards on the production of products corresponding in terms of their technical and economic indicators to the highest world level

Today, when the production of one machine requires cooperation between hundreds of enterprises of various industries, the issues of product quality cannot be solved without expanding work on improving the interchangeability system, metrological support, improving methods and means of product control. Therefore, the training of a modern engineer involves the development of a wide range of issues related to standardization, interchangeability and technical measurements. The course "Metrology, standardization and certification" is the logical completion of the cycle of general technical courses in the theory of mechanisms and machines, metal technology, material resistance, machine parts. If other cycle courses serve as a theoretical basis for designing machines and mechanisms, using typical machine parts, calculating their strength and rigidity, then this course considers the issues of ensuring the accuracy of geometric parameters as a necessary condition for interchangeability and such critical quality indicators as reliability and durability. The tasks of improving the quality of production, operation and repair of agricultural machinery can be considered in a comprehensive manner, using the principles of standardization, interchangeability and control of established technical conditions.

The purpose of the discipline is to develop the knowledge and practical skills of future engineers to use and comply with the requirements of complex systems of general technical standards, perform accurate calculations and metrological support during the manufacture, operation and repair of agricultural machinery.

As a result of the course study and in accordance with the qualification characteristic, the agricultural engineer should know: basic provisions, concepts and definitions in the field of standardization; The State system of standardization and its role in accelerating scientific and technological progress, intensifying production, improving the quality of agricultural machinery and its economic efficiency; the main issues of the theory of interchangeability and technical measurements, the rules for designating accuracy standards in design and technological documentation; methods of calculation and selection of standard fits of standard joints of machine parts; Calculation of dimension chains device for measuring linear and angular values, their adjustment, operating rules and selection procedure.