Development of technological enclosure

Contents

Contents

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1. Introduction

2. General part

2.1 Analysis of initial data

2.2 Part Specification Analysis

2.3 Part processability analysis

3. Technological part

3.1. Production Volume Calculations and Production Type Determination

3.2. Procurement Selection

3.3 Selection of process bases and procurement processing sequence

3.4 Calculation of machining allowances

3.5 Calculation of cutting modes

3.6 Equipment Selection

3.7 Selection of technological equipment

3.8 Determination of the main process time

4. Design part (fixture design)

4.1 Design Description, Purpose, Principle of Operation

4.2 Calculation of the accessory for accuracy

4.3 Calculation of accessory for clamping force

4.4 Calculation of the device for strength by weak link

4.5 Development of process of accessory assembly

5. Economic part

Part Manufacturing Cost Calculation

Conclusion

Literature

1. Introduction

The project will consider the Enclosure part.

For the part, a processability analysis will be carried out, which will allow assessing its processability, that is, the possibility of rational processing using standard tools and on existing equipment.

The calculation of the consolidation factor of the operation will allow you to determine the type of production, select the appropriate equipment, the method of obtaining the workpiece and determine the compositions characteristic of this type of production and the sequence of operations.

The design will select the type of accessory, its calculation for accuracy, clamping force and calculation of the weak link of the accessory for strength. A tool assembly route will be developed.

The result of the work will be the design of the process (roadmap, operating map, sketch map, processing route, adjustment) and design documentation (part drawing, accessory assembly drawing) according to AETD and ESKD.

General part

2.1 Analysis of initial data.

The body parts of the machines are basic parts, various parts and assembly units are installed on them, the accuracy of which must be ensured during the operation of the machine under load. Accordingly, the body parts shall have the required accuracy, rigidity and vibration resistance.

Reduction gear is intended for transmission of torque from electric motor through elastic clutch to driving shaft with change of rotation speed.

The gearbox housing is designed mainly for placement and coordination in its internal cavity of parts, their protection from contamination, organization of the lubrication system, as well as perception of forces arising in engagement of the gearbox pair and bearings.

The actuating surfaces of the housing and their mutual arrangement shall be made with such a degree of accuracy as to ensure uninterrupted operation of the gearbox throughout its service life in accordance with the technical requirements for the product.

The program of release according to the task is 5000 pcs/year, issue according to unchanged drawings for 5 years.

2.3 Part processability analysis

The main tasks solved in the analysis of the processability of the housing structure are reduced by reducing the time spent on the technological preparation of the production, manufacture of the part.

By studying the hull drawing, you can draw the following conclusions:

1. The highest requirements are for the mutual arrangement of the surfaces of the base of the housing and the axes of the holes for the installation of bearings - a deviation from parallelism of not more than 0.03 mm by a length of 200 mm.

2. High requirements are imposed on the mutual arrangement of axes of cylindrical surfaces with a diameter of 35 and 110 mm - a deviation from coaxiality of not more than 0.05mm.

These are also the most accurate surfaces (Ø35Js7, Ø100Js7).

The roughness of these surfaces is Ra1.6 μm.

To meet these requirements, it is necessary to spread these surfaces in several transitions (rough, semi-pure, finished, thin), to observe the principle of base unity in order to obtain the required amount of alignment and parallelism relative to the base of the housing.

3. High requirements are made for mutual arrangement of axes of mounting holes with diameter 8H7 - tolerance for linear dimensions is not more than 0.02 mm.

4. Requirements for other surfaces are not high. Medium (IT1214) and surface roughness allow to obtain the required surface quality after rough and semi-finished machining with a standard tool.

From the above, it can be concluded that the housing is a relatively workpiece. For its manufacture, the use of special machines and tools is not required, but it will require the manufacture of special devices for processing and control of the resulting deviations.

Conclusion

During the course work, the case part production option was analyzed, the method of obtaining the workpiece was chosen - casting into a chill; Procurement basing options for various operations are analyzed, machining allowances are calculated; You have chosen a machining route using CNC machines. selected process equipment - cutting, measuring, auxiliary tools and accessories; machining cutting modes are calculated; process time is calculated; device for blank clamping during machining on boring machine is designed. And as a result, technological documentation was developed - an operational technological process and a sketch map.

The technical and economic indicators of the project were calculated.