Course project on mechanical engineering technology on the topic: Improvement of the technological process of manufacturing the chassis crankcase part MZKT-692306

Contents

CONTENTS

with

INTRODUCTION

1 PART UTILITY ANALYSIS

2 WORKABILITY ANALYSIS OF PART DESIGN

3 SELECTION AND JUSTIFICATION OF PRODUCTION TYPE

4 PROCUREMENT SELECTION AND ITS ECONOMIC JUSTIFICATION

5 ANALYSIS OF EXISTING PROCESS

6 SELECTION OF PROCESS ROUTE VARIANT

7 CALCULATION OF GENERAL AND INTEROPERATIVE ALLOWANCES

8 CALCULATION AND PURPOSE OF CUTTING MODES

9 PROCESS RATIONING

10 DESIGN OF SPECIAL PROCESS TOOLING

CONCLUSION

APPENDIX A. Set of documents for the upgraded process

Introduction

This course design presents the development of the part machining process - the bridge crankcase 69232501012, including the development of the part machining process, the design of the machine tool, the performance of the necessary technical calculations.

The purpose of the design is to acquire practical skills in solving various technological problems of preparing the production of machine parts and developing technological documentation.

The main directions of the development of mechanical engineering provide for a further increase in its efficiency, intensification, a reduction in the timing of the creation, development and production of new progressive equipment. The organizational and methodical basis of the task is the design of machine-building products taking into account the requirements of technicality of the design.

Considering the current state of design and manufacture of machine-building products taking into account the requirements of processability, several areas of solving this problem can be noted, which directly or indirectly contribute to improving the processability of structures in accordance with the requirements of modern production. These include:

continuously increasing volume of aggregate installation of assembly units, mechanisms and equipment, development of modular design system based on typing, unification and standardization;

extensive use of computers, providing a higher level of analysis of design solutions in various uses;

organization of a wide exchange of experience in the field of creating technological structures between various branches of mechanical engineering.

Thus, the general line of engineering development - comprehensive automation of design and production - requires knowledge and a perfect design method.

The production efficiency, its technical progress, quality of products in many respects depend on the advancing development of production of the new equipment, machines, machines and devices, on the global introduction of methods of the technical and economic analysis providing solutions of technical questions and cost efficiency of technological and design developments.

For the national economy, it is necessary to increase the output of mechanical engineering products and improve its quality. This growth is carried out due to the qualitative intensification of production based on the wide use of scientific and technological achievements, the use of progressive technologies. It is possible to increase production efficiency by automating and mechanizing it, equipping production with high-performance CNC machines, industrial robots, and creating flexible production systems.

Technological progress in mechanical engineering is characterized not only by the improvement of machines, but also by the continuous improvement of their production technologies. It is important to manufacture the machine qualitatively, economically and in a given time frame with minimum costs of individual and public labor.

Part Constructability Analysis

In accordance with GOST 14.20583, processability is a set of properties of the product design that determine its adaptability to achieve optimal costs during production, operation and repair at given quality indicators, output volume and work conditions.

The manufacturing workability of the part design is the degree of its compliance with the requirements of the most productive and economical manufacture. The less labor and cost of production, the more technologically efficient is the design of the part.

The workability of the part design is analyzed taking into account the conditions of its production, considering the design features and quality requirements as technological tasks of production.

The evaluation of the processability of the design can be of two types: qualitative and quantitative. Qualitative assessment characterizes the technicality of the design generically based on the experience of the contractor and is allowed at all stages of design as preliminary. Quantitative assessment of the processability of the product design is expressed by a numerical indicator and is rational if these indicators significantly affect the processability of the design in question.

Treatment of the structure for processability is a set of measures to ensure the required level of processability of the structure according to the established indicators, is aimed at increasing labor productivity, reducing costs and reducing the time for manufacturing the product while ensuring the required quality. Types and indicators of processability are given in GOST 1883183, and the rules for testing the design of the product and the list of mandatory processability indicators in GOST 14.20183. It is recommended to perform the workability test in the following order: to select and analyze the initial materials required to evaluate the workability of the design; Clarify the volume of output; analyze the processability indicators of the basic design; determine the processability indicators of the machined part; perform a comparative assessment and calculation of the level of processability of the product under development; Develop measures to improve technological performance.

In accordance with GOST 2.12183, it is necessary to verify compliance in the drawings with the established technological standards and requirements that ensure rational methods of manufacture of products and specified processability indicators. It is necessary to give a qualitative assessment of the processability of the structure by material, geometric shape and quality of surfaces, by sizing and possible methods of obtaining a workpiece. Quantification should be carried out in absolute and relative terms. First of all, it is necessary to establish the following indicators of the base and considered product: masses of parts, blanks; Material utilization factors processing accuracy; roughness; labour intensity of manufacture; process cost.

On the basis of the above parameters of processability, relative, characterizing levels of constructability are determined by material consumption and use, by accuracy of processing and surface roughness, by labour intensity and process cost.

2.1 QUALITATIVE ANALYSIS OF WORKABILITY OF PART

The bridge crankcase is a stamped part made of 09G2S steel.

The component has the following disadvantages with respect to processability:

- non-technological in this design is the presence of a large number of holes;

- arrangement of holes in different planes.

Otherwise, the part is quite technological, allows the use of high-performance processing modes. All machined surfaces are available for the cutting tool, and controlled part dimensions are available for direct measurement. There are symmetrically arranged holes of the same diameter. Easy removal of chips. Reliable fastening of the workpiece is provided.

Conclusion

The exchange rate project was carried out on the basis of the production process. The object of the study was the part "Carter of the bridge," which is part of the assembly unit, the middle axle of the wheel chassis MZKT - 692306. The purpose of the course project was to improve the technological process of manufacturing the Carter Bridge part, two versions of the technological processes for processing the part were compared - basic and improved. According to the analysis, in the basic version, the following was made:

- combining operations 050 - vertical-milling and 055 - turning-carousel into one and the machining center MCFV 2080 is used;

- association of operations 060 horizontally boring, 065 - radial-drilling, 070-radial-drilling, 075 - radial-drilling, 080 - radial-drilling in one horizontally boring CNC machine 2A622F4 is also used;

- the cutting tool has been replaced with a hard alloy tool, and the cutting modes have been revised in the direction of their increase.

These improvements reduce the amount of scrap due to the fault of the worker, simplify his work, reduce the time for re-installation of the machine, increase labor productivity, and also reduce auxiliary processing time, thereby reducing the cost of manufacturing the part.

Операционные эскизы.cdw

Приспособление специальное для обрабатывающего центра Сборочный чертеж.cdw

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