In order to choose the right type of press, you first need to know if the machine will be used for:
You will also need to have a fairly accurate idea of the finished dimensions of the workpiece to be formed, and the dimensions of the parts to be handled for punching or riveting, in particular to be able to correctly choose the dimensions of the worktable and the press opening height.
You will then need to define the tonnage of the machine you require. This will depend on the type of material you will be working with, its thickness and the type of stamping to be performed (for example, the stamping depth or the cutting perimeter). The tonnage of the machine is usually expressed in kilonewtons (kN). There are presses from 5 kN (0.51 metric tons) up to 500,000 kN (50,000 metric tons).
Production requirements are also important to consider, whether they are unitary or small or large series. For one-off needs or small series, you might be interested in manual, mechanical or hydraulic presses, or even electric presses which also exist in portable models. For mass production, it is essential to know whether you need single striking or a repeated striking. In the latter case, you can consider transfer presses that allow you to carry out consecutive striking in a fully automatic manner.
All these criteria will allow you to choose the most suitable technology for your installation, whether it be hydraulic, mechanical or pneumatic.
Effective size of hydraulic press: length mm × width mm, the distance between the left and right columns of the length; the distance between the front and rear edges of the width. The size of the worktable is determined according to the dimensions of the mold of different products. When a hydraulic press presses and stretches different sizes at the same time, it is determined according to the maximum size of the product mold. In theory, the size of the product mold accounts for 70%-80% of the effective size of the worktable. It depends on the actual situation.
The opening size refers to the maximum distance that the oil cylinder rises to the top work surface. According to the different pressing and stretching distances of different products, in order to save the cost the most, it can ensure the safety margin of 50mm--100mm left in the main cylinder of pressing and stretching products, and it is also easier to take out the products after the mold is opened.
The stroke of the master cylinder refers to the stroke range of the piston rod, and the stroke range is smaller than the maximum stroke of the master cylinder to prevent the cylinder from being damaged.
The clamping height refers to the maximum opening height minus the stroke of the master cylinder, and the clamping height should be less than the height after the product mold is formed.
For example: the opening height is 900mm, the stroke of the master cylinder is 600mm, and the clamping height is 300mm, that is, the height of the product mold should be greater than 300mm.
Normally 600mm-750mm, different processes have different requirements, the height from the ground plus the height of the product mold, the workers can operate safely and comfortably.
The speed of hydraulic press is divided into: slow speed, fast speed, high speed. The choice of speed depends on the product process.
Actions are divided into: pressing and stretching. The process of drawing products and demoulding needs to be equipped with a top cylinder, and the operation mode is manual and automatic.
The throat depth dimension refers to the distance from the middle point of the hydraulic oil cylinder to the wall plate. The throat depth dimension is determined according to the size of the product mold. The throat depth dimension should be larger than the radius of the product mold, so as to ensure that the center point of the product mold and the center point of the hydraulic cylinder when the hydraulic press is working vertical.
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