1、 Preparation for setting parameters

1. Confirm the drying operation of raw materials

2. Confirm whether the mold temperature and barrel temperature are correct and appropriate

3. Setting parameters and actions of opening and closing molds and ejector pins

4. Ejection pressure: set initially at 60-70%

5. Pressure maintaining: Set initially at 40%

6. Ejection speed: set at a maximum speed of 50%

7. Screw speed: set at 80RPM, high raw material temperature leads to low speed

8. Back pressure: set at approximately 7kg/cm (oil gauge pressure), check material flow status

9. Ejection time: Set according to the short ejection plate, not too long

10. Cooling time: initially longer, gradually shorter

11. Pressure maintaining switching position: 95% of the product's state

12. Measurement length and post drawing settings: set based on raw materials and forming status

2、 Manual operation parameter correction

1. Key points of homework

·Confirm that all temperature settings have reached normal levels

·Confirm the degree of plasticization inside the barrel

·Lock high and low pressure positions

·Watch the formation of a batch of products and pay attention to whether the cooling time can make the products completely fixed

·Open the mold and remove the product. Check if it is removed smoothly, and if there are any scratches, tears, deformations, etc

2. Key points for parameter correction: consideration of actual position

·Temperature Pressure Injection Position Measurement Residual Material Quantity

3、 Correction of semi-automatic operation parameters

Correction of measuring stroke

Main point: Adjust the injection pressure to 99%, reduce the measuring stroke until there is a shortage of glue, and then extend it until there are burrs.

4、 Correction of filling speed

Main point: Set the filling speed to be the next speed approximately 10mm before the pressure maintaining switch, and then adjust the previous speed up and down to find the speed of missing glue and burrs, and find one point as the most appropriate injection rate.

5、 Correction of Ejection Pressure

Key point: Gradually reduce the injection pressure from 99% and record the filling time; The lower pressure when the product state is closest to 99% pressure is the final pressure.

6、 Correction of pressure maintaining

Main point: Adjust the pressure holding up and down, identify the occurrence of burrs and shrinkage pressure, and choose the middle value as the most appropriate.

7、 Correction of injection time (holding time)

Main point: When the injection time just meets the 95% state of the product, the pressure holding time gradually increases after switching the pressure holding point until the weight change of the product gradually stabilizes.

8、 Correction of cooling time

Key point: Reduce the cooling time until the following conditions are met

1. The finished product will not whiten or deform when pushed out, pinched out, trimmed, or packaged

2. The mold temperature energy is balanced and stable

9、 Correction of sol parameters

Main point: Revise according to the following principles

1. The back pressure is set to 5-15kg/m 3， No silver wire occurs, and the heating cylinder does not overheat.

2. Adjust the screw speed to make the metering time slightly shorter than the cooling time

3. The principle of loosening and retracting the stroke is to avoid tail formation, mold sticking, and air marks on the finished product during casting and abortion.

10、 Flexible use of multi-stage filling speed and multi-stage pressure maintaining

1. Multi stage speed: Set according to the appearance of the finished product during the short shot test

2. Multi stage pressure maintaining: The principle is to reduce the product size, appearance, shrinkage, and other stability.

The traditional injection molding method generally has the following drawbacks that are difficult to overcome:

1. It is prone to residual stress

2. Easy to deform and warp

3. Easy to have dents and obvious appearance defects on the bonding line

4. Dimensional accuracy can only be controlled to a level of 1%

5. It is difficult to produce optical products with fine concave and convex grooves or precise tortuosity

6. Thin or thick meat products are difficult to shape

7. Thick meat products are prone to problems such as dents, bends, or internal bubbles

8. There are significant directional differences in the product

The reasons for these shortcomings are closely related to their processing methods and principles, specifically as follows:

1. High pressure and high-speed injection of sol into the mold is required

2. Molecular coordination caused by flow

3. Distribution differences in density at different positions after injection

4. Due to the pressure loss in the flow channel, it is necessary to inject plastic at a higher pressure

5. Shrinkage differences caused by uneven meat thickness