07-05-2012, 05:26 PM
PNEUMATIC MULTI-PURPOSE PRESS
PNEUMATIC MULTI-PURPOSE PRESS.doc (Size: 56 KB / Downloads: 118)
SYNOPSIS
This report deals with design and fabrications of pneumatic multipurpose presses, which is used for bearings pressing of rotors in the shaft, bearing removing, sheet metal bending and bend removing 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. Similarly bending and bend removing process also occurred.
INTRODUCTION
The pneumatic multipurpose 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 pneumatic multipurpose press is also used to remove the bend in the shaft and bend the shaft. The principle of operation is the same as the conventional simple press. The difference is 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
Pneumatic multipurpose press reduces the manual work.
This type of machine reduces working time.
By using this machine the bearings can be inserted in the various lengths of shat (up to 600mm).
WORKING PRINCIPLE
The pneumatic multipurpose press is used for fixing bearings in the shaft up to a length of 400mm. In the pneumatic multipurpose 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 control valves. There are two control valves used in this press. One is pressure control valve or regulator and another one is the flow control valve.
When the compressed air is passed to the pressure control valve, the required pressure is obtained by adjusting its knob. When the air is passed to the flow control valve, the speed of movement of piston is controlled by adjusting 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.
Bearing inserting procedure:
First one of the bearings is placed on the bottom fixture. 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. Then the valve is brought to the output position in which the air moves the piston upward and the shaft is removed. Similarly sheet metal bending, bend removing operation are occurred.
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.