Cover Part Fabrication Project

Contents

Introduction

1 Purpose, principle of operation and process analysis of design

products

2 Service purpose and technical characteristics of the part

3 Definition of production type, lot size or rhythm

release

4 Substantiation of selection of method and method of procurement

5 Purpose of processing methods and steps, selection of bases and sequence

processings

6 Development of routing process

7 Justification for selection of equipment, accessories, cutting and

measuring tool

8 Calculation of operational dimensions

8.1 Calculation of long dimensions

8.2 Calculation of diametrical dimensions

8.3 Adjustment of workpiece dimensions

9 Calculation of cutting modes

10 Rationing of operations

11 Economic comparison of two options

12 Development of adjustment map or calculation and processing map

(RTC) for one of the operations

13 Design of machine tool

13.1 Schematic diagram of the accessory

13.2 Calculation of fixing force with determination of force characteristics

drive

13.3 Calculation of the accessory for accuracy

13.4 Description of operation of the accessory

14 Design of special control device

14.1 Schematic diagram of the accessory

14.2 Calculation of the accessory for accuracy

14.3 Description of operation of the accessory

Project Findings

List of sources used

Applications

Introduction

The engineering industry is the main technological base that determines the development of the entire industry of any country. Therefore, the growth rate of engineering should significantly exceed the similar indicators of other sectors of the national economy. Currently, engineering, like none of the other industries, is far behind the scientific and technological progress, due to the complexity of the manufactured technological equipment. The latest manufactured machines and other equipment are currently obsolete, since it takes a lot of time to develop design and technological documentation, production preparation and other organizational work. Therefore, at the moment, engineering faces a huge number of complex and important tasks, such as: planning and development of promising technologies; creation of high-performance energy and material-saving technologies; improving the quality and technical level of engineering products; application of automation and mechanization of production.

In order to achieve these objectives, more attention should be paid to the training of future specialists. The level of development of mechanical engineering is one of the most significant factors of technological progress, since fundamental transformations in any field of production are possible only as a result of the creation of more advanced machines and the development of fundamentally new technologies. The development and improvement of production technologies today are closely related to automation, the creation of technical complexes, the widespread use of computer technology, the use of equipment with numerical software control. All this constitutes the basis on which automated production is created, optimization of technological processes and creation of flexible automated complexes become possible.

8 substantiation of selection of equipment, accessories, cutting and measuring tools

When choosing a machine, they are guided by the following main considerations:

- compliance of the machine working area with the overall dimensions of the part; the part should be freely placed on the machine, but it is not practical to use a larger machine than necessary;

- the ability to provide the required processing accuracy; this consideration is of particular importance in the selection of machines for finishing and final operations;

- compliance of machine power, stiffness and kinematic capabilities with optimal processing modes;

- compliance of machine performance with specified program of parts release. In case of poor performance, the operation may require more than one machine. On the other hand, an overproductive machine will not be loaded.

In the conditions of mass production, it is also taken into account that machines with increased productivity are less versatile than general-purpose machines, therefore they are more difficult to load.

The first two rough turning operations do not require the use of complex, expensive equipment. Therefore, we choose the turning-screw machine 16K20.

For finishing turning operations, a lathe with NC 16A20F3 is applicable.

Drilling and thread cutting will be carried out on the vertical drilling machine 2H150 .

7.2 Selection of accessories

The process under development uses a three-cam self-centering cartridge, a two-spindle drill head and a special device.

When turning surfaces, we use VK8 alloy cutters. For treatment of end surfaces select turning undercut cutters GOST 1888073. For treatment of cylindrical surfaces we select turning pass stop cutters GOST 1888373 and turning pass bent cutters GOST 1887773 for machining chamfers.

At the drilling operation, we use curls and throwers made of fast-cutting steel P6M5.

When selecting measuring tools, the compliance of the tool accuracy with the controlled tolerance and the time required for measurement is taken into account.

With a small scale of production, the main measuring tool is universal tools: calipers, micrometers, universal indicator devices, etc. When the use of a universal measuring tool is irrational, it is necessary to use specially designed equipment. Surface roughness is usually controlled by comparing the surface to be treated with a reference.

Project Findings

In accordance with the type of production and the method of obtaining the workpiece chosen as a result of economic calculations, a technological process was developed for the Cover part. Operational allowances and tolerances are assigned for each operation, operational dimensions, cutting modes and time standards are calculated. From the conditions of achieving the required accuracy and productivity at the minimum cost of operations, equipment is determined, devices, a cutting and a measuring tool are selected.

To perform drilling operation No. 25, a machine tool with a pneumatic drive was designed. Calculations for accuracy and fixing forces showed that the device provides the required processing accuracy and reliable fastening of the part.

A control device for monitoring radial run-out has been developed.

For the turning operation with CNC No. 10, a calculation and processing chart has been developed.

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