Manufacturing process of the bed

Contents

Contents

Introduction

1. Part Assignment and Design

2. Part Constructability Analysis

3. Define the type and organizational form of production

4. Procurement Method

5. Basic Process Analysis

6. Process Development

7. Calculation of machining allowances

8. Calculation of cutting modes

8.1 Calculation of cutting modes by analytical method

8.2 Calculation of cutting modes by standards

9. Processing programming

9.1 Development of calculation and processing list

9.2 Coding and recording of control programs

10. Calculation of time standards

10.1 Calculation of time standards for operations performed on manual machines

10.2 Calculation of time standards for operations performed on CNC machines

11. Refinement of production type

Conclusion

List of sources used

Introduction

One way to increase labor productivity and reduce the cost of manufacturing products is to improve existing technological processes and replace them with more progressive ones.

This work is carried out on the basis of a comprehensive analysis, both of the design of products (parts) and the technology of their manufacture, starting with the selection of more progressive types of billets.

Given that the enterprises of the Republic of Belarus today do not have sufficient funds for the purchase of new technological equipment, the main attention is paid to improving technological processes based on existing equipment, the use of more advanced devices and tools. Serious attention should be paid to improving the quality of manufactured products, improving their reliability and durability.

In the course project, the following are being developed: the technological process of machining a given part, special equipment, as well as a number of issues directly related to it. The course project is divided into a graphic part, an explanatory note and technical documentation.

9. Processing programming

9.1 Development of calculation and processing list

The design of the motion diagram begins with the zero position of the part and the origin. When selecting a part zero, consider the following requirements:

- zero must be on the physical surface of the part, if possible - the time spent on adjustment is reduced;

- zero must coincide with the design base - thereby there is no need for recalculations of dimensional chains;

- zero must provide easy programming.

We take the top point on the axis of the main hole as zero of the part, we take X equal to 0, since turning. From zero, we draw the axes of the coordinate system and apply their designation: the Z axis is directed up and parallel to the axis of the part, and the X axis is perpendicular to the axis of the part and is directed to the right.

After you select a part zero, you select the location of the origin point, the point at which the tool is located before you begin machining. It is chosen so that the caliper (spindle) and the fixed tool do not interfere with the change of blanks, but it should be as close to the blank as possible in order to reduce the time spent on idle moves. The position of the origin point is applied to the sketch with its coordinates. Coordinates of origin position are selected equal for turning X = 100; Z = 60, for milling.

The tool flow diagram shows the trajectory of the cutting edges of the tools involved in part machining. Solid lines indicate working movements of the tool, and dashed lines indicate idle.

The successive reference points at which the tool direction changes are indicated by Arabic numerals. The digit corresponds to the point number. We point the direction of movement with an arrow.

The tool flow chart is designed to account for all tool movements in size and direction without exception. When constructing the trajectory, we must take into account the following moment: the tool movement with working feed should begin and end at a certain distance from the workpiece (the margin for cutting and running is usually 0.53 mm).

At this stage, we also set the necessary auxiliary commands for changing the cutting tool, changing the number of spindle revolutions and feeds, turning on the supply of lubricating cooling liquid (LFR) to the processing zone and other process commands. We complete the design of the calculation procedure by compiling a table of coordinates of reference points.

Conclusion

As a result of the course project, a complete study of the technological process of obtaining the part in small-scale production conditions was carried out. The most important stage of technology design is the purpose of the routing processing process, the selection of equipment, cutting tool.

The course design reflects two methods for assigning cutting modes - analytical and by standards. The calculation of cutting modes allows you to not only set the optimal parameters of the cutting process, but also determine the main time for each operation. The developed course design contains a number of provisions that make it possible to conclude that some changes have been made to the basic version of the process, as a result of which the route process has become better. First, a cheaper method of producing a preform is chosen. Secondly, the equipment has been replaced with more advanced equipment than in the basic version. Third, operations are performed at the NC machining center, which reduces machining time, tool change time, and part movement time between machines. As a result, the amount of equipment used is reduced, thus the cost of manufacturing the part can be judged to be lower than the basic process.