Common fiberglass processes include hand lay up, RTM, pultrusion, and compression molding, with steel molds used for mass production of pultrusion and compression molding. It is a cost-effective and efficient selection.
Molding strengths:
(1) The loss of materials is small and will not result in excessive loss (with a stable and continuous production pass rate of over 98%, less flash, generally controlled at 2-5 silk thickness).
(2) The internal stress of the product is very low, and the bending deformation is also very small, with relatively stable mechanical properties.
(3) The wear of the mold cavity is minimal, and the maintenance cost of the mold is relatively low. The lifespan of the mold varies depending on the steel material, and can range from 50000 to 500000 mold cycles
(4) The cost of molding equipment is lower, its mold structure is simpler, and the manufacturing cost is generally lower than that of injection molds or transfer molding molds. (Using hydraulic press)
(5) Can form larger flat products. The size of the products that can be molded by compression molding is only determined by the clamping force of the existing compression molding machine and the template size.
(6) The shortening rate of the product is small and the repeatability is good. The data shortening rate of Huari SMC can be controlled at negative shortening, zero shortening, or less than one thousandth shortening for different varieties
(7) It is possible to place a large number of mold cavities on a given template, resulting in a high production rate.
(8) High production efficiency, easy to complete specialized and automated production. (A single mold can achieve a monthly output value of 10000 pieces)
(9) The product has high precision in scale and good repeatability.
(10) The surface is shiny and does not require secondary modification. (Double sided gloss, good surface glossiness, diverse colors to choose from, uniform color and good gloss)
(11) Capable of producing products with complex structures in one go. (Can contain embedded parts, moldable holes)
(12) Mass production, relatively low price
SMC advocates the pressing process:
1. Pressing time: In principle, the thickness of the product should be about 1 minute per 1mm, which can be adjusted according to the actual situation
2. Pressing temperature: Positive (glossy surface of the product)/Non positive: 146-150 ℃/138-142 ℃. Note: This temperature is the surface temperature of the mold.
3. Forming pressure: greater than 100Kgf/cm2.
