Liquid Silicone Rubber (LSR) molding is a great way to manufacture products. It is widely used in electronics consumer, medical devices, and automotive. It can produce very precise parts that are also very strong and resistant to breakage. But to make LSR molding work well, it is very important to make sure that the sizes are always the same and that the molds are put in place in the right way.
Even minor errors can result in defective products, increased waste, and higher production costs.In this article, TYM will share expert tips for achieving accurate dimensions in LSR molding and provide a comprehensive guide to installing molds.
These insights will help you enhance your production process, product quality, and efficiency.TYM offers guidance on all aspects related to LSR molding, including material selection, mold design, and silicone injection molding machine selection.
Liquid silicone products, usually refers to the A/B two-component 1:1 high temperature injection moulding products.
The product is not recyclable, hit out of the product after testing if found that the size and design of the deviation often products will be bad, your manufacturing costs will follow.
Due to the liquid silicone material fluidity is very good, so before the mould processing must do a good job of the mould runners, precision design, while referring to the material properties to do the flow rate simulation analysis, to ensure that the liquid silicone products in line with the process requirements.
Secondly, is the processing of the mould must be strictly control the choice of materials, as well as processing precision control, to ensure that not process errors, reduce the liquid silicone product size error.
In addition, before the production of custom silicone products, we usually give customers a trial run of the mould, liquid silicone products in the trial mould process if there is a size deviation, you need to analyze and improve and adjust from the following aspects:
If the size is large, you need to consider whether the shrinkage rate is small; under normal circumstances, this is needed before the mould design and the guests to determine the material type, according to the shrinkage rate of the material for the mould design. On the contrary, if the size is small, you need to consider whether the shrinkage rate is too big, and consider replacing the suitable material or adjusting the mould size.
Size is large, also need to consider whether the amount of glue injection is too much, the product overflow caused by glue. You can reduce the amount of glue injection test. When the size is small, use the opposite method.
The size is large, may also be the pressure of the injection of glue is relatively large, the product is too full, you can reduce the injection pressure. Size is small, increase the injection pressure to test the product.
The size is large, increase the mould temperature, so that the shrinkage rate of the material is appropriately large; size is small, the opposite operation.
Liquid silicone moulding and material, glue amount, pressure, temperature, mould and so on are related, the above for the size of the slight difference in custom silicone products of some auxiliary adjustment direction. The main thing is to strictly control the processing accuracy, skilled process operation, can be less detour, fast and smooth mass production.
The liquid silica gel moulding, which is usually called liquid silica gel moulding, refers to the custom silicone products formed by mixing A/B two-component liquid silica gel material through the special Isr injection molding machine by fixed 1:1 ratio and curing after high temperature heating in the special mould，silicone injection molding machine in the process of moulding is It needs to use the inherent mould, different shapes and structures are processed through different moulds.
In the moulding process, how to load the mould of liquid silicone, what are the precautions or procedures?
First of all Isr injection molding machine needs to do the following preparatory matters before mounting the mould:
1、Prepare the tools needed for moulding installation.
2, check the machine power cord has no loose and broken line phenomenon, check whether the gas supply has been connected, whether the air pressure to meet the requirements of the machine running.
3、Start the motor, check the machine parts move normally. When starting a switch of machinery, you must first confirm the function of the switch button and the key action of the movement of the rotary mode, you can not operate blindly.
Start to load the mould before the normal operation of the silicone injection moulding machine, the steps of mould loading are as follows:
1、After confirming that there is no foreign matter in the slot of slide plate, start the function of sliding mould until the slide plate moves to the required position (left or right).
2、Confirm that the name, specification and model of the mould to be loaded match with the specification of the custom silicone products to be produced.
3、Use manual hoist to lift the mould to the confirmed position of slide plate. During the process of starting the machinery, no more than one person can operate, and the body can not touch any part of the machinery that can be moved.
4、Use the manual mould closing function to make the injection seat move down slowly until the distance between the injection nozzle and the gate of the mould is about 50mm.
5、Adopting the function of moving in and out of the shooting seat, make the shooting seat move down slowly until the shooting nozzle and the gate of the mould are just in contact with each other. If they don't match, move up the nozzle about 10mm, and gently tap the side of the mould with a copper rod, until the nozzle and the mould sprue are completely matched. Then move up the injection seat to the movable plate of the frame.
6、Use the manual closing function to lock the mould between the two templates and turn off the oil pump motor.
7、Use the spanner tool to cooperate, use the mould pressure foot plate to firmly press the mould on both sides of the mould base plate. Note that the plane of the presser plate is parallel to the bottom plate of the mould.
8、Install the air pipe, oil pipe, cooling water pipe and other accessories needed for the mould.
9、Use the function of mould opening and locking to open the mould. Adjust the parameters of mould locking, so that the action of opening and locking the mould reaches the best running condition.
In the process of Isr injection molding machine, the mould is an essential key part, do a good job of pre-production mould loading operation is very important for the smooth running of the production and the improvement of the yield rate. Please execute the above operation procedures and steps carefully.
