Selection of injection molding machines and molds is a key link in injection molding production, which directly affects product quality and production efficiency. Following are main considerations when selecting:

 

1. Injection volume
- Calculation basis: According to weight of product and weight of runner system, ensure that injection volume is between 20%-80% of rated injection volume of injection molding machine.
- Formula: Injection volume = product weight + runner system weight.
2. Clamping force
- Calculation basis: According to projected area of product and cavity pressure, ensure that clamping force is sufficient to prevent flash.
- Formula: Clamping force = product projected area × cavity pressure.
3. Mold size
- Considerations: Length, width, and height of mold must match tie rod spacing, mold plate size, and maximum mold thickness of injection molding machine.
4. Mold opening stroke
- Requirement: Mold opening stroke should be greater than twice product height to facilitate smooth product removal.
5. Ejection system
- Requirement: Ejection force and stroke of injection molding machine must meet mold ejection requirements.
6. Other factors
- Injection speed: Select appropriate injection speed according to product structure.
- Plasticizing capacity: Ensure that plasticizing capacity meets production requirements.
- Energy consumption: Select energy-saving equipment to reduce production costs.

1. Mold material
- Selection basis: Select appropriate materials such as P20, H13, etc. according to product materials, production batches and mold life.
2. Mold structure
- Two-plate mold: suitable for simple products.
- Three-plate mold: suitable for complex products.
- Hot runner mold: suitable for mass production and reducing waste.
3. Number of cavities
- Determination basis: Determine number of cavities based on production requirements, injection volume and clamping force of injection molding machine.
4. Cooling system
- Requirements: Design a reasonable cooling system to improve production efficiency and product quality.
5. Ejector system
- Requirements: Ensure that ejector system is designed reasonably to avoid product deformation or damage.
6. Exhaust system
- Requirements: Design a reasonable exhaust system to prevent bubbles or burns in product.

 

1. Matching of injection volume and mold cavity: Ensure that injection volume meets mold cavity requirements.
2. Matching of clamping force and mold projection area: Ensure that clamping force is sufficient to prevent flash.
3. Matching of mold size and injection molding machine mold plate size: Ensure that mold can be installed correctly.
4. Matching of mold opening stroke and product height: Ensure that product can be taken out smoothly.
5. Matching of ejector system: Ensure that ejection force and stroke of injection molding machine meet mold requirements.

1. Product requirements: Select appropriate injection molding machines and molds based on product appearance, dimensional accuracy, etc.
2. Production efficiency: Select efficient equipment to increase production.
3. Cost control: Select cost-effective equipment and molds on premise of meeting requirements.
4. Maintenance and care: Select equipment that is easy to maintain to reduce maintenance costs.
Selection of injection molding machines and molds needs to comprehensively consider product requirements, production efficiency, cost control and other factors to ensure reasonable matching of equipment and molds to achieve efficient and stable production.