Stamping press machine selection is directly related to the safety of the equipment and a series of important issues such as production efficiency, product quality, mold life and production costs. The choice of the manufacturer is also taken into account. Today, we will discuss how to choose a stamping press machine and a stamping press machine manufacturer.
The selection of the type of stamping press machine is mainly based on the nature of the stamping process to be completed, the size of the production batch, the geometric size and precision requirements of the stamped parts, etc.
For the stamping production of small and medium-sized blanked parts, bent parts or shallow-drawn parts, open crank presses are often used. Although the rigidity of the open type press with C-shaped bed is not good enough and the punching force will cause the bed deformation and lead to uneven distribution of die clearance, it has the advantages of open space on three sides, convenient operation, easy installation of mechanized attachments and low cost. At present, it is still the main equipment for the production of small and medium-sized stamping parts.
For large and medium-sized stamping parts with high precision requirements, closed crank presses are mostly used. These presses are closed on both sides, with good rigidity and high precision, but the operation is not as convenient as open presses.
For large or more complex deep drawing parts, closed double-action deep drawing presses with upper drive are often used. For small and medium-sized deep drawing parts (especially enamel products, aluminum products deep drawing parts), often use the bottom drive type double-action deep drawing press. The closed double-action drawing press has two sliders, the outer slider for crimping and the inner slider for deep drawing. Crimping force is reliable, easy to adjust, simple die structure, suitable for mass production.
For small and medium-sized stamping parts with large production volume or complex shape and large volume, automatic high-speed press or multi-station automatic press should be preferred.
For small batch and thick material stamping parts, hydraulic press is often used. Hydraulic presses have adjustable closing stroke, especially for stamping processing with larger force stroke, and have obvious advantages compared with mechanical presses, and will not be overloaded due to over thickness of sheet material. However, the production speed is slow and the efficiency is low. It can be used for bending, deep drawing, forming, leveling and so on.
For precision stamping parts, it is better to choose special precision punching presses. Otherwise, it is necessary to use ordinary crank press or hydraulic press with higher precision and rigidity, and add crimping system and counter-pressure system to carry out fine stamping.
After the type of punch press machine is selected, the specifications of the punch press machine should be selected according to the punching pressure (including unloading force, pressing force, etc.), deformation work required in the punching process, as well as the structure form and closing height of the die and the contour size of the shape.
The nominal pressure of the press refers to the maximum working pressure allowed on the slider of the press at a specific distance from the lower stop point, i.e., when the crankshaft of the press rotates to a specific angle (called the nominal pressure angle, about 30 degrees) from the lower stop point. According to the working principle of the crank linkage mechanism can be learned, the pressure of the press slider is not a constant in the full stroke, but changes with the change of the crankshaft angle. Therefore, when selecting a press, it is necessary to consider not only the size of the nominal pressure, but also to ensure that the stamping process force curve must be under the permissible load curve of the press slide when finishing the stamping process.
In general, the nominal pressure of the press should be greater than or equal to 1.3 times the total stamping process force. For precision blanking on open presses, the nominal pressure of the press should be more than 2 times the total process force of the press. For deep drawing process, in order to select convenient and make the press work safely, appropriate safety factor can be considered, which is approximated as
The slide stroke of the press is the distance passed by the slide from the upper stop point to the lower stop point. The size of the press stroke should be able to ensure that the blank or semi-finished products into and out of the formed parts. Generally, the stroke required for blanking and fine pressing process is small, while the stroke required for bending and deep drawing process is large. The stroke of the press used for deep-drawing parts should be at least 2.5 times greater than or equal to the height of the finished part.
The closing height of the press refers to the height between the bottom plane of the slide and the working table when the slide is at the lower stop. Adjust the length of the press linkage to adjust the size of the closing height. When the press linkage is adjusted to the uppermost position, the closing height reaches its maximum value, which is called the maximum closing height. When the press linkage is adjusted to the bottom position, the closing height reaches the minimum value, which is called 4.
The plane size of the press machine table pad should be larger than the plane size of the lower die, and leave sufficient room for fixing the die, usually 50-70mm on each side.
The size of the leakage hole or pop-up device set at the bottom of the mold must be smaller than the size of the table hole of the press machine.
The die shank diameter of the die must be the same as the diameter of the hole for die shank mounting in the press machine slide, and the height of the die shank should be less than the depth of the die shank mounting hole.
A site visit to the factory is the best and most direct way to confirm if they are a qualified and genuine press manufacturer
Product variety, a good China press manufacturer has outstanding manufacturing capabilities and can usually offer a wide range of product types and specifications.
China press manufacturer order inspection reports
Check their audit reports
Ask for customer testimonials
Send your technical package and related documentation to the China press manufacturer
Get a quote from the Chinese press manufacturer
Confirm the price and ask them to start manufacturing the product for you
Schedule quality and stress tests according to your needs and ask the Chinese press manufacturer to send you a report for approval
After all tests are passed, mass production is completed and accepted, the product is shipped.
Arrange payment and importation.
Industrial metal presses deform metal through dies to form or cut metal. Therefore, we need to be clear about our future needs for producing products, such as the materials used to manufacture the finished product, the size and specifications of the finished product, and the specifications of the finished product. Choose from different types of Stamping press machines such as high speed presses and precision presses according to your needs
Stamping punch press manufacturers usually detail their products on their websites, often with more detailed specifications. You can compare them carefully to see if they are the specifications you need. And check out the customer reviews on the website, they can provide you with a more objective reflection.
You can try to talk to them to find out if their products are suitable for your production and if the technical team of the stamping punch press manufacturer is professional. This is important and will greatly affect whether you can work happily together.
Choosing the right stamping punch press is a very important step in your production, so check carefully when making your choice.
Before understanding your uncertainties, find out what industrial facilities know and which brands they work with. You can visit their official websites and also contact some of their customers to learn about their experiences.
JDM as the best press manufacturer and wholesaler in China, we produce all types of presses for the international market, all our customers come from all over the world, we understand the needs of our customers and we are committed to high quality press manufacturing.
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There is no doubt that choosing the right and suitable Stamping press machine can bring great benefits, so you need to be very careful when choosing your equipment and manufacturer. We hope this article will be of help to you.
JDM as a leading stamping press manufacturer in China, we provide high level high speed presses, mechanical presses, precision presses, etc. all over the world, which are widely appreciated by our customers.
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