Screw Compressor Assembly Drawing

Contents

Introduction

1. Assembly Process Plan

1.1. Define Production Type

1.2. Service assignment

1.3. Calculation of dimension chains

1.4. Build Process Plan Development

2. Part machining process

2.1. Service purpose of the part and namesake requirements for it

2.2. Part Constructability Analysis

2.3. Procurement Selection

2.4. Development of part manufacturing process route

2.5. Calculation and definition of machining allowances and tolerances

2.6. Calculation of cutting modes and unit time standards

Conclusion

List of sources used

Graphic Material List

Sheet # 1. Screw Compressor Assembly Drawing

Sheet # 2. Working drawing of screw compressor wheel

Sheet # 3. Screw compressor assembly process diagram

Sheet # 4. Drawing of compressor wheel blank

Introduction

The production of internal combustion engines continues to increase, as this energy source has high fuel economy, quite small metal consumption, long service life, simplicity, convenience and safety in use. The use of ICE in all areas of the national economy and the constant increase in their number raise the question of improving the quality of engines. The quality of engines depends largely on the technological means available to the enterprise, since the development of the design is often constrained by the inability to provide it with the available technological means. First of all, this concerns the stable accuracy of the manufacture of parts and the assembly of individual assembly units and ICE as a whole, since even if you do not change the design of the engine, but only tighten the tolerances for manufacturing and assembly, increase the technological discipline, then the performance of the engines produced will improve. This is also facilitated by the automation of all stages of production, the use of new manufacturing technologies, and the improvement of methods and means of technical control, as well as the optimization of methods for producing blanks and heat treatment. Special attention should be paid to the selection of appropriate structural materials, since it is the optimal version of the material, close to the ideal one, that provides the designer with the capabilities of modern solutions.

That is why the design engineer must represent the whole task in the complex, which means to own information, both about the accumulated experience of mechanical engineering and about the latest achievements.

The objective of this course project is to develop the process of assembly of the screw compressor and machining of the screw wheel that meet the above requirements.

1.2. Service assignment

Cars are the most common transport that provides the transportation of people and goods, and in the foreseeable future it is predicted to increase their role as a means of transporting goods. Other types of power plants: electric motors, gas turbines, etc., do not yet create serious competition for internal combustion engines.

The decline in oil reserves and the constant increase in fuel costs are forcing us to look for ways to improve the fuel economy of the engine. In recent years, due to the developing environmental crisis, stringent requirements have been imposed on the release of toxic substances by engines into the atmosphere.

An important place in improving the environmental and economic performance of the engine is given to inflation. The meaning of the pressurization is to increase the power of the engine at its constant size and speed due to an increase in the density of air charge in the cylinder. More air allows you to use more injected fuel and get more work. Despite the need to strengthen the engine design to perceive increased gas pressures during pressurization, the specific power increases faster than the mass required to increase strength. Therefore, the specific gravity of the engine decreases. The cost of a unit of power is reduced.

The use of pressurization allows to improve fuel efficiency and reduce the toxicity of the exhaust gases, to form the desired flow of engine characteristics for the most efficient operation on the vehicle, to increase reliability and durability. Supercharged engines have a smaller drop in power when operating at high altitudes, caused by a decrease in air density.

Different types of compressors are used to pressurize the engines. One of them is a screw compressor, its efficiency reaches 82% (including mechanical friction losses). The advantages of such compressors include their compactness, achieved by high speed, as well as the absence of oil in the blown air.

Conclusion

This course design is the development of the process of assembling the screw compressor and the process of machining the rotor of the screw pair. During operation, process routes for compressor assembly and rotor machining were drawn up based on the conditions for improving the quality and processability of this product.

During the course design, the following were calculated: the size chain, allowances and tolerances for the machining of the rotor, as well as cutting modes, time standards and the necessary power of machine tools in draft operations during rotor processing.