Chassis Part Process Design

Contents

0. INTRODUCTION

1. DESIGN ASSIGNMENT

2. HULL PROCESS DESIGN

2.1. ANALYSIS AND PRE-DESIGN PREPARATION OF PART DRAWING

2.2. TECHNICAL PROPOSALS FOR DESIGNING THE PROCESSING PROCESS

2.3. PROCESS SCOPE DESIGN

2.3.1. Select possible machining types for surface groups

2.3.2. Selection of machine tools

2.3.3. Formation of STOC groups

2.3.4. Cross Dimension Calculation

2.4. ENGINEERING OF PROCESSING SEQUENCE AND OPERATIONS

2.4.1. Operation Design

2.4.2. Cutting modes

2.4.3. Calculation of expected dimension accuracy

3. INSTALLATION FIXTURE DESIGN

4. DEVELOPMENT OF DIAGRAM OF CONTROL OF MUTUAL ARRANGEMENT OF SURFACES

4.1. STRUCTURAL PARAMETERS OF THE MAIN ELEMENTS

4.2. CALCULATION OF MEASUREMENT ERROR

4.3. INSTRUCTION TO USER

5. CONCLUSION

6. LIST OF LITERATURE USED

Introduction

This paper presents the design of a single technological process for machining the body of a cargo hoist, a sketch design of an installation clamping device, for use in one of the operations, a scheme for monitoring the accuracy of the mutual arrangement of surfaces.

Basic Feature Design Parameters

When manufacturing a part, it is necessary to fulfill the requirements of accuracy of mutual arrangement of surfaces.

The part drawing shows the requirements for the accuracy of the surfaces. this is not perpendicular to surfaces 9 and 1. Not perpendicular must not be more than 0.04 mm.

In this point, a scheme for monitoring GRP of surfaces 9 and 1 has been developed. This scheme uses a plate adjacent to the surface 1 and an expandable self-centering mandrel which is rigidly connected to and perpendicular to the plate. Non-perpendicular of plate and mandrel is assigned in accordance with reference literature and is equal to 0.003 mm. Indicator unit is secured on mandrel to rotate thereon. Between the unit and mandrel the fit with clearance H7/h6. Maximum clearance between mandrel and indicator unit is 0.027 mm. The indicator unit uses the multi-turn indicator 1 MIS, GOST 969675 with a division price of 0.001 mm. The limit measurement error is 0.003 mm. Plate is made with parallelism of its planes 0.002 mm.

Expansion self-centering mandrel is made with three balls, which are expanded by thrust screw.

Let's calculate the measurement error when using this mandrel.

Instruction to the user

1. Install MIS indicator 1, GOST 969675 on the accessory.

2. Install the accessory on the part, rest the plane and insert the mandrel into the hole.

3. Open the mandrel with the screw, turning the bolt from the hand until stop.

4. Visually check the densities of the plate abutting the part.

5. Set preliminary tension 1 mm on the indicator.

6. Set the indicator scale to zero.

7. Turn the indicator unit around the mandrel by 180, following the indicator readings.

8. The part shall be considered suitable when the indicator arrow deviates from zero position by not more than 0.012 mm (12 indicator divisions).

9. Remove the expansion bolt.

10. Remove the accessory from the part.

11. Remove the indicator from the accessory.