CHINESE
New Bright Carbon Fiber Products Co., Ltd
Advantages and disadvantages of different molds in composite material manufacturing
Aluminum alloy mold has low density, good density and good heat conductivity, which makes aluminum alloy heat up fast and can be better heated and formed in component manufacturing. However, when making composite material components, due to the large difference between the expansion coefficient and the expansion coefficient of composite materials, large internal stress will be generated in the manufacturing of components, resulting in the deformation of composite materials. It is not conducive to the stability of composite component properties. Although the machined alloy steel die has good durability, and the coefficient of thermal expansion is 50% lower than that of aluminum alloy, it has large mass, low temperature performance, uneven temperature distribution, and easy to produce stress, so it is difficult to be used to manufacture high-precision composite products.
Compared with alloy steel die, nickel electroforming die has the advantages of low density, good heat conduction performance, good thermal heating performance, and can manufacture complex surface, but the die itself has a long preparation and processing cycle, and parts maintenance is difficult. Its coefficient of thermal expansion is 12.3×10-6/℃, which is much higher than the coefficient of thermal expansion of composite material. It is also not suitable for the preparation of high-precision carbon fiber composite materials (thermal expansion coefficient of 2~4×10-6/℃) and aramong fiber composite products.
Graphite mold has high thermal conductivity and good heating effect. Although the thermal conductivity rate of graphite is not as high as that of aluminum alloy and other metal molds, the thermal expansion coefficient of graphite mold is matched with arnylon fiber composite materials and carbon fiber composite materials, so it is suitable for the processing of composite materials. Secondly, the thermal mass of graphite mold is low, which is similar to that of composite materials. The heat required by the graphite mold in the unit volume is the same as that of the composite material when it is heated, but the strength and abrasion resistance of the graphite mold are low, the brittleness is large, the impact resistance is poor, and it is easy to be damaged, which is not conducive to the production of large or complex shapes, and its vacuum is poor, the cost is high, the manufacturing cycle is long, and there are difficulties in mass processing and production.
Compared with alloy steel die, nickel electroforming die has the advantages of low density, good heat conduction performance, good thermal heating performance, and can manufacture complex surface, but the die itself has a long preparation and processing cycle, and parts maintenance is difficult. Its coefficient of thermal expansion is 12.3×10-6/℃, which is much higher than the coefficient of thermal expansion of composite material. It is also not suitable for the preparation of high-precision carbon fiber composite materials (thermal expansion coefficient of 2~4×10-6/℃) and aramong fiber composite products.
Graphite mold has high thermal conductivity and good heating effect. Although the thermal conductivity rate of graphite is not as high as that of aluminum alloy and other metal molds, the thermal expansion coefficient of graphite mold is matched with arnylon fiber composite materials and carbon fiber composite materials, so it is suitable for the processing of composite materials. Secondly, the thermal mass of graphite mold is low, which is similar to that of composite materials. The heat required by the graphite mold in the unit volume is the same as that of the composite material when it is heated, but the strength and abrasion resistance of the graphite mold are low, the brittleness is large, the impact resistance is poor, and it is easy to be damaged, which is not conducive to the production of large or complex shapes, and its vacuum is poor, the cost is high, the manufacturing cycle is long, and there are difficulties in mass processing and production.
