During the processing of the molding machine, it is necessary to strictly control the following key factors to ensure the quality and performance of the product:
1. Temperature:
Importance: Temperature is a key factor affecting the hot melt, flowability, and curing process of materials. Low temperature may cause incomplete melting of the resin, affecting the bonding strength and uniformity of the material; If the temperature is too high, it may cause excessive resin flow, resulting in voids or cracks inside the material.
Control requirements: For high-performance materials such as carbon fiber, the molding temperature is usually controlled between 150-250 ℃, and high temperature uniformity is required. The temperature control accuracy is generally within ± 1 ° C.
2. Pressure:
Importance: Appropriate pressure can promote tight bonding between resin and fibers, eliminate excess resin and air, and reduce porosity. However, excessive pressure may cause fiber damage or deformation, affecting the mechanical properties of the material.
Control requirements: The forming pressure of carbon fiber is usually controlled between 1-10 MPa, and the pressure distribution should be uniform. The pressure deviation is usually required to not exceed 5% of the set value.
3. Time:
Importance: Molding time, which refers to the insulation and pressure holding time of the compression mold, ensures that the shape of the mold cavity has sufficient time to complete curing, allowing the resin to be molded into thermoplastic material. If the time is too short, the resin may not fully cure, resulting in the mechanical properties of the composite material not meeting the standards; If the time is too long, it may cause low production efficiency and even reduce the toughness of the material due to excessive curing.
Control requirements: The molding time of carbon fiber is usually controlled between 1-10 minutes, and the specific time needs to be accurately calculated and controlled according to the type and curing characteristics of the resin.
4. Mechanical accuracy:
Importance: The parallelism and flatness of the upper and lower pressure plates of the molding machine directly affect the quality of the molded product. Insufficient parallelism and flatness can lead to local overvoltage or undervoltage of the material, affecting the thickness consistency and surface quality of the product.
Control requirements: The design of the molding machine must ensure high mechanical accuracy, usually requiring parallelism and flatness errors to be less than 0.01mm.
5. Control system:
Importance: With the development of intelligent manufacturing, the control system of the molding machine requires a high degree of intelligence, which can monitor and adjust key parameters such as temperature and pressure in real time, as well as have fault diagnosis and automatic correction functions.
Control requirements: Advanced sensors and control systems are used to provide accurate temperature control and pressure regulation functions, making the manufacturing process more controllable and stable. Some mold temperature machines are also equipped with advanced automation systems that can monitor and adjust parameters in real time, optimize the hot pressing process, and improve production efficiency and product quality.
6. Safety and environmental standards:
Importance: The molding machine should not only meet technical requirements, but also comply with relevant safety and environmental standards, including emergency shutdown, overload protection and other safety functions, as well as adopting low-energy design, reducing noise and dust emissions and other environmental protection measures.
