1. Confirmation and preliminary settings beforehand
(1) Confirm that the material drying, mold temperature and heating cylinder temperature are correctly set and reach the processable state.
(2) Check the opening and closing mode and the action and interval setting of the ejection.
(3) The injection pressure (P1) is set at 60% of the maximum value.
(4) The holding pressure (PH) is set at 30% of the maximum value.
(5) The injection speed (V1) is set at 40% of the maximum value.
(6) The screw speed (VS) was set at about 60 RPM.
(7) The back pressure (PB) is set at about 10 kg/cm2.
(8) The looseness is set at 3mm.
(9) The position of the pressure holding switch is set at 30% of the screw diameter. For example, a screw of φ100 mm is set to 30 mm.
(10) The measurement stroke is set to be slightly shorter than the calculated value.
(11) The total injection time is slightly shorter, and the cooling time is set slightly longer.
2, manual operation parameter correction
(1) Lock the mold (confirm the rise of the high pressure) and advance the injection seat.
(2) Shoot manually until the screw stops completely and pay attention to the stop position.
(3) The screw is retracted and fed.
(4) After cooling, the mold is opened and the molded product is taken out.
(5) Repeat the steps (1) to (4), the screw stops at the position of 10% to 20% of the screw diameter, and the molded article has no short-shot, burrs and whitening, or cracking.
3. Correction of semi-automatic operation parameters
(1) Correction of the measuring stroke [Metric end point] The injection pressure is increased to 99%, and the holding pressure is temporarily adjusted to 0, the metering end point S0 is adjusted to the short shot, and then the back is adjusted to the occurrence of the burr to the middle point. To choose a location.
(2) Correction of the exit speed restores the PH to the original level, adjusts the injection speed up and down, finds the individual speed at which the short shot and the burr occur, and uses the middle point as the appropriate speed. [This stage can also enter the multi-segment speed corresponding to the appearance problem. Parameter setting].
(3) Keep the pressure up and down to adjust the pressure to find the individual pressure of the surface depression and burrs, and choose the pressure at the middle point.
(4) The correction of the holding time [or the injection time] gradually lengthens the holding time until the weight of the molded product is obviously stabilized.
(5) Correction of cooling time gradually reduce the cooling time, and confirm that the following conditions can be satisfied: 1. The molded product is ejected, pinched, trimmed, and packaged without whitening, cracking or deformation. 2. The mold temperature can be balanced and stable. Simple algorithm for cooling time of products with a thickness of 4mm or more:
1 Theoretical cooling time = S (1 + 2S)....... The mold temperature is below 60 degrees.
2 Theoretical cooling time = 1.3S (1 + 2S)....... Mold 60 degrees or more [S indicates the maximum meat thickness of the molded product].
(6) Correction of plasticizing parameters
1 Confirm whether the back pressure needs to be adjusted;
2 adjust the screw speed so that the metering time is slightly shorter than the cooling time;
3 Confirm that the metering time is stable, try to adjust the gradient of the heating coil temperature.
4 Confirm whether the nozzle has dripping material, whether the pig tail or the mold is generated in the main channel, whether the finished product has air marks or the like, and appropriately adjust the temperature of the nozzle part or the interval of the retreat.
(7) Segment pressure and multi-segment rate
1 In general, the injection should be based on high speed without affecting the appearance, but should be carried out at a lower speed before switching between gates and holding pressure;
2 The pressure should be gradually reduced to avoid the residual stress in the molded product is too high, so that the molded article is easily deformed.
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