Customized rapid prototype vacuum casting|silicone molds|
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A prototype is also called a model or a mock-up. JPR Model has been using CNC machining, SLA prototyping, vacuum casting , reaction injection molding and all inclusive surface treatment techniques to make top class functional prototypes, presentation mode

                               The advantages and disadvantages of vacuum casting mold hand plate|


The previous hand is mostly handmade, due to the reason of the equipment, not only the accuracy is not high, but also poor quality, large limitations.


At present, the basic use of CNC processing hand plate, hand plate high precision, high degree of automation, to make the hand plate is more unified.


Vacuum casting is also a hand model, then vacuum template?


What is vacuum coated hand plate?


Vacuum mold refers to the use of the existing template, in the vacuum state to make silicon mold, in the vacuum state with PU, silicon, nylon, ABS and other materials pouring, clone the same as the original template copy.


The advantages of vacuum compound mold hand plate.


1. Low cost, short product production cycle, less waste, and much lower processing cost than CNC processing 3D printing.


2. Suitable for the processing and production of small batch products.


After making the original, it can be copied according to the original.


3. Good mold operation.


The soft mold after curing is transparent or translucent, good tensile strength, cutting and parting is convenient.


4. Small chance of processing failure.


If the original is right, the copy will be right.


5. Good repeatability.


The silica gel in the mold has good fluidity before curing and can precisely maintain the detailed structure and decoration of the mold with vacuum defrosting.


The disadvantage of vacuum duplicate mold hand plate.


We need the original sample of the product to make the duplicate model.


The original sample referred to here can be provided by the customer or processed by CNC according to the customer's needs.


2. For large and thin products, shrinkage should be considered in the process of vacuum mould production, resulting in small product size;


3, hand proofing can not be mass production, single cost is relatively high.


4. Easy to contraction deformation, because after the high temperature heating will shrink, cause deformation, the general error of about 0.2 mm.


Other causes of shrinkage deformation are as follows:


1) Quality of silica gel.


The silicone used in the production of silicone moulds is of poor quality.


The shrinkage of high grade rubber is 0.1 %, the shrinkage of common rubber is about 3%, and the shrinkage of low grade rubber is larger.


2) Material shrinkage.


Vacuum/low pressure injection hand plate needs high temperature to melt plastic particles during injection, but the material is affected by thermal expansion and contraction, the size may be just appropriate when injection, cooling will shrink/warpage, etc., the product accuracy does not meet the standard.


3) The workbench is uneven.


The table where the silicone mold is placed for vacuum filling is tilted.


If you want to make a good copy of the hand plate, the silicone mold placed on the table must be stable.


It is convenient for uniform filling of materials.


4) Not sufficiently solid.


The mold silicone is put into use before it is fully cured.


Although the mold can be taken out in a few hours after pouring, it generally takes more than a week to fully cure. If the time is sufficient, it is best to take out the mold after one month to use. But now the pursuit of high efficiency and high quality, so it is unrealistic to put it into use after a period of time.