Various techniques are used to manufacture rubber mouldings, which include compression moulding. Simple tools made of steel plates for tops and bottoms are usually used for manufacturing compression mouldings. These tools have one or more cavities in the shape of the final mould carved out in them. Complicated mouldings usually have more than two plates for compression.
Preparation Before the production of rubber mouldings begin, the material required for the process needs to be prepared. A mass of uncured rubber that has been pre-compounded is first cut in a specific shape. The cuts are also made to bring the rubber to a specific weight so that it can be easily converted into mouldings.
The weight and shape of the rubber at this stage determines the success in the production of rubber moulds. How the rubber flows under compression and heat is largely dependent on its shape and weight. At this stage, you can easily understand how much of rubber is excess, which will have to be removed when the final rubber moulding is created.
Make sure that the compression tools are loaded into the exact press before the moulding process begins. The mould tool size is responsible for the selection of the press suitable for the compression moulding of the required part. The pressure that would be needed for operating the compression tools is determined at this stage. Prior to the beginning of the manufacturing of rubber mouldings ensure that all the machines and tools are set up properly.
The Moulding Process You’ll then need to load the pre-cut rubber into the tool cavity to begin the compression moulding process. Now close the compression mould and heat it up to a pre-set temperature. When the compression tools become heated, the rubber inside the tool cavities melts to form the desired shape. Then the rubber moulding is vulcanized at a set time. Remove the rubber part from the compression tool after the cycle is complete. Flash trim the excess rubber around the part thus created in order to produce the finished product.
Advantages The compression tools that have been used to create the first set of rubber mouldings can be used again and again to create the same kind of mouldings of same shape and size. Among the many advantages of compression moulding are the high volume that can be manufactured in one go. Low volume rubber moulding production can also be done easily using the compression moulding method.
Budget In case you need to manufacture a small number of sealing solutions like rubber parts, you can easily set up the compression tools at a low budget. You can use a large number of cavity tools for compression if you need to meet a large order for rubber moulding parts. Single impression tools usually cost very less, making it profitable for companies to invest in compression mouldings.
Multiple cavity tools, however, cost more but the return on investment is higher when you use them. You can use as many types of part designs as you want with multiple cavity tools. In order to accommodate undercut features, you can use compression tools having multiple plates.
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This entry was posted on Friday, January 20th, 2012 at 2:20 am and is filed under automotive classes. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.