Clamping Force
Calculate the required clamping force: Calculate the required clamping force based on the number of mold cavities, the projected area of the product, and the injection pressure. Generally, the clamping force should be greater than the mold expansion force borne by the cavities during injection to prevent phenomena such as mold parting surface expansion during the injection process, which can lead to defects like product flash. The formula is F = p × A × n, where F is the clamping force, p is the injection pressure, A is the projected area of a single product, and n is the number of cavities.
Select a suitable injection molding machine: Based on the calculated clamping force, choose an injection molding machine with sufficient clamping force. At the same time, consider the accuracy and stability of the injection molding machine's clamping force to ensure reliable clamping force under different production conditions.
Injection Volume
Determine the product weight or volume: Accurately calculate the weight or volume of a single product, including the material usage of the product itself, the runner system, and the gate and other附属 parts (here it means additional parts, could be translated as "accessory parts" for better English expression). For products with complex shapes, precise calculations can be made using three-dimensional modeling software.
Match the injection volume of the injection molding machine: When selecting an injection molding machine, its maximum injection volume should be greater than the required injection volume of the product. Generally, it is required that the maximum injection volume of the injection molding machine be 1.5 - 2 times the weight or volume of the product to ensure that there is enough plastic to fill the cavities during the injection process and to avoid plastic degradation due to excessive residence time in the barrel.
Injection Pressure and Speed
Consider mold structure and product requirements: For thin-walled products or products with complex structures and high precision requirements, high injection speeds and appropriate injection pressures are required to ensure that the plastic can quickly fill the cavities and reduce defects such as weld marks and short shots. For thick-walled products or products with low appearance requirements, the injection speed and pressure can be appropriately reduced to avoid problems such as product deformation and bubbles.
Adjust parameters to match the mold: Adjust the injection pressure and speed according to factors such as the runner design, the number and position of gates in the mold. For example, a multi-gate mold may require a more uniform injection speed distribution to ensure that all cavities are filled simultaneously.
Mold Opening and Closing Stroke and Platen Size
Adapt to mold height and stroke requirements: The mold opening and closing stroke of the injection molding machine should meet the requirements for mold opening and closing to ensure that the mold can be installed smoothly and the product can be removed. The height of the mold should be within the maximum and minimum spacing range of the injection molding machine platens; otherwise, normal installation or mold closing will not be possible.
Match the platen size: The platen size of the injection molding machine should match the outer dimensions of the mold to ensure that the mold can be accurately installed on the injection molding machine through the locating ring, and the mounting holes on the platen correspond to those on the mold, facilitating the fixation of the mold with bolts.
Cooling System
Analyze mold cooling requirements: Design a reasonable cooling system based on the mold structure, the shape and thickness of the product, and production efficiency requirements. The layout of the cooling water channels should be as uniform as possible to ensure uniform cooling of all parts of the product and reduce deformation.
Match the cooling capacity of the injection molding machine: The cooling system of the injection molding machine should be able to provide sufficient cooling water volume and an appropriate water temperature to meet the cooling requirements of the mold. The flow rate and pressure of the cooling water pump should match the resistance of the mold cooling water channels to ensure that the cooling water can circulate smoothly within the mold.
The matching of injection molding machine parameters with molds requires a comprehensive consideration of multiple factors. Precise calculations and reasonable adjustments should be made before production to achieve an efficient and stable injection molding process and produce high-quality products.
