Vacuum casting is a common handplate technology, which is mainly used in handplate model making, small-batch model making and small-batch production with material requirements.The application industry has intelligent hardware, modified car auto parts, toys, communication equipment, plastic shell, medical equipment shell, robot shell and so on.The advantages of vacuum casting hand plate model are: thin silicone viscosity, easy to operate, no deformation, no shrinkage, easy to remove the mold, the surface of the mold smooth, good simulation effect.
Common problems of vacuum casting:
1. Dimensional deviation product deformation
Causes and solutions: with the vacuum casting production process, especially the temperature control of the mold has a great relationship.Other reasons such as prototype scaling and material shrinkage should also be controlled.Products longer than 1.5 meters should be made with reinforced molds.
2. The products cannot be assembled
Causes and solutions: the drawings of product engineers are set according to the injection molding process, often without considering the difference between vacuum casting process and injection molding process.The vacuum casting process is vacuum adsorption molding, so the precision of products can be controlled within ±0.1mm. For assembly products with higher precision requirements or with requirements of sensitivity and tightness, small-batch production engineers are required to make adjustments to the vacuum casting prototype, and post-processing assistance is required to meet the requirements of assembly.
3. Brittle and cracking of finished products
Causes and solutions: mainly caused by the use of domestic inferior materials and defects in the complex molding process. The solution is to ensure that the material procurement channel is guaranteed. If there is no problem with the materials, improve the process and pay attention to the control of oven temperature, heating time, cooling time and cooling mode.
4. Air bubbles and hollow
Causes and solutions: the bubbles produced by vacuum casting products are related to the silicone mold materials and curing agent reaction. It is necessary to control the time when pumping the vacuum. Too long time or too short time will easily produce bubbles.The other is with the product structure and the location of the feed port.Bubbles on the surface of products will greatly affect the appearance of products and the durability of materials, so it is necessary to strictly follow the technological process to effectively avoid.
5. Lost product details
Causes and solutions: in the manufacturing process of some slender products, details are easy to be lost. The main reason is that the silicone mold is not well baked and easy to be deformed, resulting in details being lost.In addition, in the process of making the mold, the damage of the prototype of the product also directly leads to the loss of details of the product from the duplicate mold.Solutions to improve the process, must be in prototype grinding, mold production, finished mold production of each link carefully check.
6. Rough and uneven surface
Causes and solutions: the quality of vacuum casting products has a lot to do with the prototype. To improve the surface quality of finished products, firstly, the production process and surface effect of the prototype should be improved. The prototype can be produced by CNC.In addition, the use of poor quality silica gel will also lead to rough and uneven surface of the mold.The solution is to use high quality silica gel mold production, select the most appropriate process to make the prototype, to ensure the hardness of materials, surface and compatibility between materials.
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