Molding Parameter Setting Up Instruction 2-2 l Fox Mold

6. The best setting of cooling time is that the molded product can be easily ejected from the mold without deformation.

7. The injection speed and maximum injection pressure should be set reasonably by comprehensively considering factors such as material properties, molded product structure, and molded product appearance requirements. In order to eliminate defects in molding (burning, flow lines, poor exhaust, weld lines, burrs, etc.), the injection speed can be set to multi-stage injection, and the speed, pressure, and speed switching position can be adjusted to improve it. The speed switching position can be determined through short shot tests.

8. The setting of the holding pressure switching position can also be determined through the short shot test. When the molded product is filled to 95% of the filling volume, start switching.

To hold pressure, the metering position at this time can be set as the pressure holding switching position When determining the holding pressure switching position, the holding pressure setting.

During this process, you can confirm whether the metering position is appropriate, and you can also determine the injection time and injection pressure .

The injection time setting is 0.5 to 1 second longer than the actual injection time; the injection pressure is higher than the actual injection pressure.

200 ~ 300 kg / c ㎡ . (The injection pressure is generally set at 800 ~ 1000 kg / c ㎡ at the beginning , and then adjusted accordingly according to the appearance of the molded product and the actual peak pressure ) .

9. When setting the holding pressure, the holding pressure of POM series materials is generally set to 500kg / cm2 , and the holding pressure of high-temperature glass fiber-containing materials is generally set to 200kg / cm2 . Then , according to the appearance of the product, the holding pressure is increased to an appropriate value in units of 50-100kg / cm2 , and the holding time is gradually extended. When the weight of the molded product does not change, the holding time is the solidification time of the gate. The actual holding time should be set to be 0.5-1 second longer than the gate solidification time . Too long holding time will only increase the cycle time and has no practical significance. When adjusting the holding pressure and holding time, the change should not be too large, and attention should be paid to observing the ejection condition of the product to avoid the occurrence of top penetration, ejector pin breakage, etc.

10. Set the molding conditions according to the principles of 1 to 9 above, and produce products that meet the customer's (drawing) requirements, and fluctuate ± 20% on the basic conditions to confirm the molding conditions, so as to prevent defects that may be caused by fluctuations in conditions in advance. Potential defects can be improved before mass production.

Note: Precautions for mold change ( mold trial ).

1. During mold changing ( mold testing ) processes, personal safety should be taken into consideration and operating procedures should be strictly followed to avoid damage to molds and equipment.

2. The molding cycle is controlled within the target cycle time.

3. If it is a production mold, you need to call up the historical parameter record table for reference.