Design of the main motion drive of a metal-cutting machine with a multi-speed engine

Contents

Introduction

1. Basic Machine Main Motion Drive Structure Analysis

1.1. Brief description of the purpose and main technical characteristics of the base machine

1.2. Construction of structural grid of main motion drive of base machine

1.3. Plot the speed of the main motion drive of the base machine

2. Design of the main motion drive structure of the designed machine with multi-speed electric motor

2.1. Selection and description of PGA structure

2.2. Construction of structural grid of PGD of the designed machine

2.3. Selection of PGD motor attachment method, taking into account preservation of base machine attachment structure

2.4. Plot spindle speeds

2.5. Description of kinematic diagram and layout of PGD

3. Design of the gearbox of the main motion drive of the designed machine

3.1. Calculation of gear numbers of wheels of multiplying groups

3.2. Calculation of deviations of obtained spindle speeds from standard values

3.3. Calculation of gearbox module by bending strength condition and permissible contact stresses

3.4. Approximate calculation of drive shaft diameters

3.5. Calculation of shaft for complex resistance

3.6. Calculation and selection of bearings

3.7. Calculation of splines and keyways

4. Comparative analysis of PGD arrangements of base and designed machine by number of shafts, gears, bearings

Conclusions and conclusions

Bibliographic list

Paper

The course work contains 53 pages, 9 tables, 10 figures, 5 sheets of the graphic part, 2 names of literary sources.

MAIN MOTION DRIVE, MULTI-SPEED MOTOR, STRUCTURAL GRID, KINEMATIC SCHEME, ROTATION SPEED GRAPH, GEAR RATIOS, GEAR NUMBERS, TOOTH MODULE, SHAFT CALCULATION, SPEED BOX DEPLOYMENT, SPEED BOX CONVOLUTION.

The objectives of the course work are to consolidate the knowledge gained in the study of theoretical, general engineering and special disciplines, and to use this knowledge in the independent design of individual units of metal cutting machines.

In this course work, it is necessary to design the drive of the main movement of the turning-screw machine based on the 1K62 machine using a multi-speed electric motor.

Introduction

The best design solutions in the design of drives can be found if the designer knows the design of the entire machine, its technological purpose, the level of performance and accuracy, the degree of automation and has information about motion drives in similar machines.

When performing this course work, it is necessary to correctly apply modern standards for machine-building drawings, tolerances and fits, machine-tool normals and typical structures.

Source Data:

Kinematic structure of PGD: Zn = 23· 31· 26· 212 = 24;

nmax = 2500 rpm;

nmin = 12.5 rpm;

φ = 1,26;

Electric motor: AIR160S4/2;

Ned = 11/14 kW;

ned = 1500/3000 rpm.

Conclusions and conclusions

In the presented course design, the drive of the main movement of the turning-screw machine using a two-speed electric motor was designed. The drive has 24 speeds.

To create the cutting speed movement in the machine, a drive with mechanical speed control is used, consisting of a two-speed AC motor and a gear box. The drive is combined, that is, the speed box and the spindle unit are made in the form of one unit.

The speed gearbox is twenty-four-speed.