Silicone mold is one of the simplest methods in rapid mold. It is usually to mold the RP prototype with silica gel, but the service life is very short, only 0-30 pieces! He has good elasticity and replication performance, Die can not consider the draft taper, will not affect the dimensional accuracy, there is a very good segmentation, without the upper and lower mold can be directly cast as a whole. And then cut along the scheduled parting line to remove the master mold on it!

Room temperature vulcanized silicone rubber is divided into two types of additive and condensation!

Raw materials and formulations using special mold silicone, the goods sold in the form of double packaging, A component is a plastic material, B component is a catalyst. Preparation should take into account the room temperature, mold strength and hardness, in order to determine the weight ratio of AB components. Room temperature at 20-25 degrees, A: B = 00: .5. Room low (but not less than 0 degrees) is appropriate to increase the B component 0.-0.3 copies. Higher room temperature is to reduce the B group 0.-0.3 copies. The specific method is based on the volume of the mold to determine the total amount, and then the A, B components proportionally weighed accurately, placed in the vessel stir, Serve.

Mold silicone operation method:

. Mold Silicone and curing agent Stir the mold Silicone appearance is a flowing liquid, A component is silicone, B component is a curing agent, for example: Take 00 grams of silica gel, add 2 grams of curing agent (Note: Silicone and curing agent Be sure to stir evenly, if not stirred evenly, the mold will be cured and uneven drying conditions affect the life of silicone mold and turn over the mold number, and even scrapped the mold.

2. Vacuum exhaust bubble treatment: Silicone and curing agent after mixing vacuum exhaust bubbles, vacuuming time should not be too long, not more than 0 minutes, or silicone curing cross-linking reaction, can not be brushing or Perfusion, resulting in material waste.

3 brushing operation: the bubble row of silica gel: Brush or pour the way down on the mother mold (in the brush mold or mold on the former mold release agent or release agent) brushing mold must be uniform, 30 minutes after sticking a layer of cloth or glass fiber cloth to increase the strength and pull the mold, the second brushing and then paste a layer of gauze or fiberglass cloth, and then brushing silica gel, after this out of the mold has Life and mold turnover times, long life, cost savings and improve efficiency.

4. Outer mold making Generally used method is surrounded by plastic or wood around the mold, one is the use of gypsum mold box can be filled, the other is the use of resin mold brushing a brush Layer of resin brushing a layer of glass fiber cloth and then brush and then paste, repeated two or three layers to complete the outer mold.

5. Silicone (Silicone, Silicone) and curing agent ratio reflects the situation: It is recommended that the amount of curing agent can not exceed 5%, curing agent, the greater the proportion of the curing time faster, the more brittle mold, short service life. Can also be based on product and process requirements appropriate amount of silicone oil molding better, pay attention to not excessive silicone oil (5% -0%), or affect the silicone mold pull and hardness.

Silicone mold making Note:

, B component is a catalyst, susceptible to moisture hydrolysis, it should be used to cover the lid tightly.

2, A, B group once mixed, chemical reaction; immediately began to gradually increase the viscosity, can not be suspended, in order to avoid waste, should be based on dosage, with the use with distribution, with a good immediately after use, without delay.

3, A, B group with the ratio of the chemical reaction speed and mold performance. The more component B, the faster the reaction, the higher the strength and hardness of the product, but the lower the toughness. Therefore, the weighing requirements are accurate.

4, before the preparation, should be A group of ingredients stir up and down, then weighing.

5, casting method suitable for relief class, brushing method for three-dimensional mold production. Casting embossed mold should be made first length and width are greater than the original carved length and width of the 4-6CM border. The border should be flat, the inside should be smooth. Pour the border placed on a clean glass, then the original on the box, leaving each side of the 2-3CM gap. (Mold silicone 25-35 yuan / KG)

Silicone mold in the production process bubble solution:

, to improve the flash tank and exhaust system design

2, increase the pressure of the press

3, to reduce the amount of release agent, and spray evenly

4, material control water ........

5, you can try some anti-foaming agent

6, the use of cold runner.

7, vacuum suction with a vacuum machine, the mold can increase the exhaust operation.