Pneumatic Bearing Press -Mechanical Mini Project

SYNOPSIS

This report is deals with design and fabrication of a pneumatic bearing press, which is used for fixing bearings to the rotor shaft and bearing cup with the help of a compressor.

Initially the shaft is held between two fixtures; top of the bearing is freely located on the step in the shaft and the other one is placed on the bottom fixture. As one of the bearing (located on the shaft step) is compressed, both the bearings are inserted in the shaft simultaneously as the top fixture moves down words.

INTRODUCTION

The pneumatic bearing press is used for fixing the bearings in the shaft by holding the shaft between two fixtures. One of the fixtures is movable and the other is fixed. The principle of operation is the same as the conventional simple press. The difference is being only in the type of drive and the type of fixtures used. The following points reveals why we have to make use of this type of press for fixing bearings.

Pneumatic bearing press reduces the manual work.
This type of machine reduces working time in fixing bearings.

By using this machine the bearings can be inserted in the various lengths of shat (up to 600mm).

WORKING PRINCIPLE

The pneumatic bearing press is used for fixing bearings in the shaft up to a length of 600mm. In the pneumatic bearing press the main thing being the pressure developed is done with the help of a compressor. The air in that compressor is passed to the double acting cylinder through the direction control valves. There are two control valves used in this press. One is flow control valve and another one is the Direction control valve.

When the compressed air is passed to the flow control valve, the required speed of the movement of the piston is obtained by adjusting its knob. When the air is passed to the direction control valve, the up/downward movement of piston is controlled by the knob. The cylinder piston rod is connected to the top fixture. A bottom fixture is fixed on the bottom plate by using bolts and nuts.

Pneumatic Bearing Press
Pneumatic Bearing Press

Bearing inserting procedure:

First one of the bearings is placed on the bottom fixture. Then the shaft is taken and the other bearing is kept ion the step in the shaft. When the shaft is kept vertically on the bottom fixture some portion of the shaft goes inside the bottom fixture.
At the same time the compressor is loaded to get the pressure required and the hand operated valve is manually actuated from the neutral position to the input position to move the piston. The top fixture in the piston had inserted to its required position rod pushes the bearing which is placed on the shaft. When the bearing had inserted to its required position, there will not be any further down ward movement; at the same time the entire shaft will move downward so that the another bearing placed on the bottom fixture also gets inserted. Then the valve is brought to the output position in which the air moves the piston upward and the shaft is removed.

ADVANTAGES

1. It reduces the manual work
2. It reduces the production time
3. Uniform application of the load gives perfect fitting of the bearing.
4. Damages to the bearing due to the hammering is prevented
5. It occupies less floor space
6. Less skilled operator is sufficient

DISADVANTAGES

1. Initial cost is high
2. Cylinder stroke length is constant
3. Need a separate compressor

APPLICATIONS

Bearing Pressing Operation in all industries
Bearing Removing operation in all Industries
Sheet metal bending in sheet metal industries
Sheet metal bend removing in all industries
Punching operation also done
Riveting and metal forming also done with the help of separated male and female die.

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