〠Abstract 】 The structural design, parameter selection and formula calculation of airbag air cushion are expounded, and its performance, advantages and disadvantages are analyzed in detail.
After the air cushion is installed on the press, a deeper drawing process can be performed, thereby expanding the process range of the press. Therefore, air cushion devices are widely used for medium and above presses.
There are many types of air cushions. According to different structural forms, they can be divided into single piston type, double piston type and triple piston type; fixed cylinder type and movable cylinder type; air cushion self-guide type and table guide type; adjustable stroke type and non-selectable Adjust the stroke type and so on. Depending on the installation location, it can be divided into an upper air cushion and a lower air cushion. When the air press is deep drawing, the air cushion plays the role of pressing and unloading the material; when the press is punching, it acts as a top piece.
At present, non-piston air cushions, ie airbag air cushions, are used on some small presses at home and abroad. The working part of this air cushion is a collapsible elastic airbag. Under the action of compressed air, the airbag expands and expands, and the pallet is lifted up to make the air cushion work. The pallet and the bottom plate of the air cushion are all welded structures of steel plates, and the structure is simple and easy to manufacture. This paper takes the 1000kN upper air cushion used in combination with 6 airbags as an example to introduce the structure, parameter selection and working performance of the airbag air cushion.
First, the air cushion structure
For air cushions with large countertops and large air cushion force, multiple airbags can be used in combination. The air cushion structure is shown in Figure 1. The sleeve 1 also serves as an air reservoir to reduce the fluctuation of the air pressure in the airbag 2 during the working process, so that it is not necessary to provide an air reservoir outside the air cushion. The air-cushion cap 3 is embedded with a guide rail plate 4, and the material is made of polytetrafluoroethylene with strong self-lubricating ability, and the lubricating performance is good. The intrinsic rubber buffer block 9 between the air cushion cap 3 and the slider pad 6 reduces the impact of the air cushion on the slider pad during operation. The shot bar 7 is fixed to the air cushion cap. Since the air source (air) contains moisture, after the air cushion is used for a long time, some water is accumulated in the airbag 2, so the water can be discharged through the drain valve 8.
Second, the selection of air cushion parameters and performance
The natural height of the airbag airbag H0 airbag is not subject to any natural height when compressed. After the airbag is mounted on the slider, it is subjected to a pre-compression force, and the height Hmax after compression is its installation height. After the air cushion has reached its required stroke, its height is Hmin, then the maximum stroke of the air cushion S = Hmax-Hmin, as shown in Figure 2.
When compressed air enters the air cushion and the air cushion is subjected to a load, the effective area of ​​the pressure is called the effective area, which is indicated by A. At this time, the effective diameter of the airbag is D0.
1. Parameter selection
(1) Relationship between air cushion load and air pressure
W= nPA
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