Development of "Shaft" part machining process

Contents

Introduction

1. General part

1.1. Source Data

1.2. Part Assignment and Design

1.3. Drawing and Part Specification Analysis

1.4. Part Processability Analysis

2. Technological part

2.1 Definition of type and form of organization of production

2.2. Basic Process Analysis

2.3. Select the workpiece design and method

2.4. Calculation and Selection of Machining Allowances

2.5. Selecting Machining Methods for Surfaces and Process Bases

2.6. Development of production route

2.7. Select equipment, tooling and tools

2.8. Process Operation Design

2.9. Selection of cutting forces and power processing modes

2.10. Predicting accuracy of dimensions and quality of machined surface

2.11 Technical Time Rationing

2.12. Economic comparison of processing options

Conclusion

Bibliographic list

Attachment 1 - Shaft Working Drawing

Attachment 2 - Workpiece Drawing

Appendix 3 - Process of shaft processing with indication of selected cutting, auxiliary and measuring tools

Appendix 4 - Machining Sketches

Introduction

The role of engineering technology in the development of industry plays a large role at this stage of development.

In different fields of industry, various technological processes are used, leading to increased productivity and improved quality of products.

The correct development of technology leads to a reduction in the cost of manufacturing and designing various types of materials and tools.

Mechanical engineering ensures the manufacture of new and the improvement of existing technological processes and technologies, which make up a significant share in industry in the production of industrial goods and products.

Nevertheless, the development of domestic engineering, and not the import of machines and technologies, is a line in the modern development of mechanical engineering technology.

The rate of tightening the performance of machines is constantly increasing and engineering is forced to solve design technological problems more quickly in a market economy, the speed of solving which plays a major role in the production of competitively capable products.

Design and fabrication are two major steps in a single process. These stages are inextricably linked, it is no longer possible to imagine design without taking into account technological.

Technological designs save costs and increase accuracy, use of high-performance equipment, tooling and tools, and save energy. The more technological the design turns out to be, the more perfect and cheaper its production will be. During preparation it is not necessary to make adjustments to drawings and modifications.

The above proves the relevance of the chosen topic.

The purpose of this course work is to design the manufacturing process of the shaft part.

General part

1.2. Part Assignment and Design

In this course work, the shaft part for which the manufacturing process will be designed is considered. This part is part of the worm gear box. Shaft installed in mechanism, which transmits rotation to actuator of mechanism.

The shaft part is a basic part on which bearings, worm wheels are installed, it is installed in the housing on rolling supports (bearings), the basic surfaces of the axis A and B. On the outlet sections, the drive element is provided with a clearance fit. Bearings are adjusted by nut.

Process Part

2.2. Basic Process Analysis

We will analyze the process according to the following items:

a) conformity of the method of obtaining the workpiece to the given scale of production, its compliance with the drawing by size, processing allowances and technical conditions;

By basic technical. blank is produced by rolling under conditions of small-scale production. But for this program for the production of parts (mass production), the production of a workpiece by rolling is low-performance and therefore unacceptable. Based on the design of the part and its dimensions, the material is steel 45, it is possible to obtain the initial workpiece by forging.

The specification contains all necessary procurement data.

b) correct selection of bases on all operations and observance of the principle of unity of bases;

c) correspondence of the sequence of operations to achieve the specified accuracy of the part;

According to the basic process, the surface of ∅50k6 mm is treated in the following sequence with obtaining accuracy parameters:

Turn preliminary -10 square meters, Ra = 3.2 μm;

Single grinding - 6 sq., Ra = 1.6 μm.

According to table 5 [6], these methods allow you to provide the specified parameters.

d) compliance of equipment with the requirements of this operation in terms of accuracy, overall dimensions, capacity;

e) equipped with high-performance cutting and measuring tools and devices.

2.10. Predicting accuracy of dimensions and quality of machined surface

In order for the product to perform its service purpose economically, it must have the quality necessary for this.

Product quality - a set of product properties that make it suitable to meet certain needs in accordance with its purpose.

The main indicators of product quality include serviceability, durability, productivity, efficiency, accuracy of connections, noise level, safety, convenience and ease of maintenance, degree of mechanization and automation, etc.

The quantitative value of quality indicators can be set either at the design stage as the level to which you want to strive during product design, or during the design process it is calculated as the result obtained during the development of this design.

The measured value of quality indicators is established as a result of factory tests of the product or control measurements. At the same time, the measured value of each quality indicator can have a plurality of values ​ ​ in a certain interval, provided that not one product was manufactured, but a batch.

Actual quality indicators are detected as a result of observation and from the training of products in operation.

The accuracy of the manufacturing of parts using the automatic sizing method does not depend on the qualification of the machine worker, the productivity of the processing process is usually high, the obtained parts are interchangeable.

Thus, the method of automatically obtaining the dimensions of the machined surfaces is characterized, first of all, by the fact that work is carried out on pre-tuned machines using special devices and more complex adjustment of the machine itself.

Conclusion

As a result of the course design, calculations were carried out to develop the technological process of a general engineering part of the shaft type. During the work, all the necessary calculations were carried out, the operations that are necessary for the manufacture of this part, namely: certain operations were selected, transitions to these operations, cutting modes were selected, and the processing time of the workpiece.

All these stages were carried out taking into account the type of production, the material of the workpiece and the material of the cutting parts of the tools. In addition, the selection of measurement and control tools was carried out. For each operation, the selection of metal cutting equipment, cutting tool, technological equipment was carried out .

Machining technology is a complex and constantly developing industry. It requires continuous research and development of new opportunities, but in addition, fundamental disciplines must be known

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