Plasticization and injection molding processing te

2022-10-23
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Plasticizing and injection molding processing technology of CD-ROM IX

▲ 24: Name: the internal diameter is too small

Description: quality control measurement results - the required value is: 15+0.1/-0.0mm

possible causes: (1) incorrect punching conditions (with "deep drawing" effect)

(2) the temperature of punch and nozzle sleeve is too high

(3) the shrinkage is too large because the pressure holding is too low or the time is too short

recommended actions:

(1) increase the punching speed and delay punching

(2) check the flow of coolant in the punch and nozzle sleeve. If necessary, reduce the temperature by increasing the water flow or reducing the water temperature

(3) increase the pressure holding or pressure holding time

▲ 25: Name: the internal diameter is too large

Description: quality control measurement results - the required value is: 15+0.1/-0.0mm

possible causes: (1) the punch diameter is too large

(2) the temperature of punch and nozzle sleeve is too low

(3) the holding pressure is too high

recommended operation:

(1) check the punch size and process it if necessary

(2) increase the temperature of punch and nozzle sleeve

(3) reduce pressure holding

▲ 26: Name: the depression angle is too large

alias: "copper basin cap", propeller, dished

Description: requirements for quality control measurement results: the maximum deviation from the reference plane is ± 0.6 degrees

possible causes: (1) two parts of the mold are cold 8 It can realize the fast/slow rise and fall adjustment of the beam when the sample is clamped, but it is uneven

(2) the holding pressure is too high

(3) the die closing ring of the die is sunken

(4) when the mold is opened (mirror side) or stripped (die side), the exhaust time is set incorrectly

(5) excessive heat transfer between yoke and mirror

(6) the protective glue layer is too thick or the protective glue shrinks excessively

(7) the die is too thick

recommended operation:

(1) make the temperature of the two parts of the mold equal

(2) reduce pressure holding

(3) readjust the clamping ring to reach the actual die thickness

(4) correcting them has made a great contribution to the cost control of automotive products, reducing self weight, improving comfort, etc. exhaust time, if necessary, clean the exhaust hole

(5) check the insulation gap in contact with the mold and check whether there is pollution

(6) measure and compare the discs before and after applying protective glue. If necessary, reduce the thickness of protective glue after inspection and minimize the amount of protective glue

(7) check the die thickness

▲ 27: the disc is too thick

Description: quality control measurement result requirements: the thickness of the formed disc base: 1.2 ± 0.1mm, the thickness of the finished product after splashing, coating protective glue and printing is 1.2+0.3/-0.1mm

possible causes: (1) the mold is too wide during glue injection

(2 liquid crystal rubber tensile testing machine is a mechanical testing machine for tensile, contraction, bending, shearing, tearing, peeling and other mechanical properties of metal and non-metallic materials). The mirror surface is polished too much

recommended operation:

(1) increase clamping force

(2) the maximum pressure can be reduced by switching from injection to pressure holding in advance, or reducing the pressure holding to the mold

(3) check the thickness of the actual cavity

▲ 28: the disc is too thin

Description: requirements for quality control measurement results: thickness of formed disc base: 1.2 ± 0.1mm, thickness of finished products after splashing, coating protective adhesive, printing 1.2+0.3/p - compressive strength of corrugated box (n)- 0.1mm。

possible causes: (1) the actual cavity thickness is not enough

(2) the mold is too small during glue injection

recommended operation:

(1) re process the mold

(2) reduce the clamping force

(3) postpone the transition from injection to pressure holding or increase the maximum pressure that can be increased in the mold

(to be continued)

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