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Injection molding machine adjustment technology analysis - 3

2021-08-05

Injection molding machine adjustment technology analysis - 3

11. Bubble

Cause Analysis (basis for the transfer machine: Reference charge parameters)

Mold reasons 

1, too small in water

2, mold is difficult

3, the mold is water cooling

4, local difficult, set exhaust treatment

Process reasons 

1, improper back pressure setting

2, the holding time is too short

3, the pressure pressure is too small

4, the radio speed is too fast, the molten glue speed is too high.

5, the typical face is difficult, difficult to bubble.

6, the tube temperature is too high

7, mode temperature setting is not appropriate

Design reason

1, improper water mode (pin point, square, circular, fan)

2, improper in the water position

3, thickness is unbalanced

4, the rubber level is too thick

5, the water exit design is not rounded into the glue,

6, the exhaust set is not proper, not enough

Equipment reasons 

1, tangent is too small

For reasons for materials 1, the material is not good, the baking temperature is not set

2, the material particles are too large, the particles are uneven, the particles are uneven

 

 

12. Deformation

Cause analysis (basis for transfer and machine: refer to controlled parameters)

Mold Cause 

1. The cooling effect of the mold waterway is unbalanced, leading to mold temperature, and contraction deformation.

2. The mold release system is not smooth, unbalanced, and the top is deformation.

3. The convex core is required to ship the water to cool in place.

4. Product sticky mold to pull deformation, top deformation

5. Too small in water, stress deformation

6. The line is position, the core is not smooth, and the sticky mode is deformed.

7, product wall thickness difference, resulting in differentiation of contraction

Process Cause 

1. Before and after the mold temperature is unbalanced: 5 points of the front mold, 5 points after the mold, the side is hot, contraction deformation

2, the pressure is too large, the overstextile, stress deformation

3. The cycle time is too short.

4. Improper packaging, extrusion deformation

5. Take the speed is too fast

6. Improper punching and drawing

7, the process parameter setting is unreasonable

Design reason 

1. Designed thickness, too much, contraction deformation

2. Strengthening the mulberry is not designed, contraction deformation

3, improper deposition, contraction deformation

4. Improper formation, stress deformation

5, the shape of the plastic parts is not properly designed, there is a curved or asymmetrical shape

Equipment reasons 

1, uneven, or too fast

Material cause 

1. Material shrinkage, contraction deformation

2, the flow direction and the molecular chain orientation difference between the flow direction, causing the shrinkage to deformed

 

 

13. Black Point, Impurity, Burning Black

Cause analysis (basis for transfer and machine: refer to controlled parameters)

Mold cause 

1. Mold rubbed iron powder, iron powder black

2. The gum is difficult to burn, and the exhaust needle needs to be set.

3. Hot flow channel temperature control abnormal, plastic decomposition

4. Hot runner sharp angle residual rubber, plastic decomposition

5, mold line, frozen iron powder, oil and black

Process reasons 

1. The race is too fast, the position is not good, difficult to black

2. Environmentally dust-gray black dot, need to isolate machine

3. Melt temperature, hot runner temperature is too high, plastic decomposition

4, the shutdown does not use PP water, the original color of the PP is completely cleaned, causing residual material carbon

5. The production process is short-term downtime without timely insulation, resulting in a black spot of the barrel plastic

6. The production process is warming up and starts in time, resulting in a black spot of the barrel plastic carbon

7, back pressure is too high, plastic decomposition

8, toner, adjust the quality of melt glue

Design reason 

1. Exhaust is not good, difficult to burn

 

Apparatus for equipment 

1. The barrel has foreign matter, carbonide,

2. Screw carbonide black spots

3, three small wear, carbonized black spots

4. Observed inlet

 

Material cause 

1. Material impurities, foreign matter

2. Water mouth is not clean

3, environmental dust

 

 

 

14. Color difference

Cause analysis (basis for transfer and machine: refer to controlled parameters)

Mold cause 

1, mold is difficult, local temperature is too high, burn yellow difference

2. The water is too small, cutting hot yellow

3. The thermal channel temperature control is abnormal, and the plastic is yellow.

4. Improper mold water is too high, and the mold is too high.

 

Process Cause 

1. When the temperature of the melt glue, the temperature of the heat flow is not properly set, and there will be color difference.

2. Improper flushing stroke, too long, there will be color difference

3. The back pressure is too high, yellow is poor

4. The temperature is too high, and it is become

5, the screw speed is too fast

6. Product storage position sun, sunning, sunburn

7. The temperature of the product is too high, yellow, whistle

8, the cycle is too slow

Design cause design products thick and thin, yin and yang color

Equipment Cause 

1. Three small parts, barrel damage, preoperative quality is not good, yellow

2, the tube temperature is unstable

Material Cause 

1. Plastics batch is different from the batch of the model, different color difference, color difference

2. Toner, colored mother, color difference

3, the proportion of water, abnormal color

4. Too misady, color difference

5, when mixing, not strictly done according to the job guide

 

 

 

 

15. Elastic position

Cause analysis (basis for transfer and machine: refer to controlled parameters)

Mold reasons 

1. Too small in water, spray pattern

2, the water port is not smooth, there is a sharp corner

Process Cause 

1. The position of the rubber into the water to the collapse is slow, 10% or less

2, the position of the water inlet water is high

3. Adjust the back pressure, need to be around 5-10 bar

4. Pumping position should be appropriate

5. The nozzle temperature is tall, but it is not ambiguous.

Design reason 

1. Improper in the form of water, (transparent lenses, flat places)

2, the water is not properly positioned, (take place in the glue)

3, water port should be set, set cold well well

Equipment Cause 

1. Three small pieces, barrels are broken, can't get glued

2. The mechanical back pressure is not, broken

For material reasons 

1. The material is not baked, and the moisture is not completely excluded.

2. The granulation is too bad.

 

 

 

 

16. Cracked, crack (dark)

Cause analysis (basis for transfer and machine: refer to controlled parameters)

Mold Cause 

1. The mold waterway is unbalanced, leading to the mold temperature, and the shrinkage is broken.

2. The mold release system is not smooth, unbalanced, topped

3. Product sticky mold to pull

4. Too small in water, internal stress crack

5, the line, the core is not smooth, sticky mode

6, the mold angle R is not set, save

Process Cause 

1. The front and rear mold temperature is unbalanced: 5 points of the front mold, 5 points after the mold, the side is hot, and the shrinkage stress crack

2, the holding is too large, shooting too much, the top is broken

3. The speed is too fast.

4. Improper transfer of improper punching and cracking, top

5, the pressure pressure pressure, the holding time is not appropriate

6, improper cycle

Design reason 

1. Demand design is not appropriate: push plate form, thread thickness, secondary demolding form

2. Strengthening the rib is not designed, pulling

3. The bone rib R is not set, pulled it.

4, the top needle is not properly positioned

Equipment

Material for material 

1. Not baked

2. The material is too crispy, or add toughness

 

 

 

 

17. Running, flow marks

Cause analysis (basis for transfer and machine: refer to controlled parameters)

Mold Cause 

1. Too small in water, spray curved

2. The surrounding products should be opened, the exhaust is not too concentrated, forming airflow

3, the thickness of the thickness

Cause 

1. The temperature is low

2. It is too fast.

3. Take the gelatinous section to slow down

4. Adjust the back pressure, need to be around 5-10bar

 

Design reason 

1. Improper in the form of water, (transparent lenses, flat places)

2, the water is not properly positioned, (take place in the glue)

3. Most of the rubber level thickness, take the rubber

4, the mode analysis is not good

Equipment

Material for material 

1. Not baked

2. Yes, toner, color mother diffusion, corrugated shape

 

 

 

18. Cold rubber

Cause analysis (basis for transfer and machine: refer to controlled parameters)

Mold cause

1. Mold tuning wire, toner

2. The mouth is capped.

3. Condensation Temperature Control Unusual

4, the worship residue

Cause 

1. The nozzle temperature is too low.

2. The front mode temperature is too low.

3. Pumping the gel

4 The back pressure is too low, and the quality of melt is not good.

5. The hot tuning temperature is too low.

6, pumping, seating, no mouth temperature is not good

Design Cause 

1. The mold has a sharp angle, especially the product of PC (high temperature, uncomfortable material)

2. The product has a sharp angle, hiding a rubber cooled material

3. Improper formation of thermal flow needle valve design

Equipment Cause 1. There is a broken circle of guns.

4. The borehole is greater than the mouth of the mouth.

 

Material cause 

1. Material impurities, foreign matter

 

 

 

 

19. Scratch

Cause analysis (basis for transfer and machine: refer to controlled parameters)

Mold cause 

1, mold drag

2, mold scratches

 

Causes of the process 

1. Tract when the robot is taken

2. Tailing wire

3. The product is dropped, the thimble, the guide post

4. Take the injury during packaging and transportation

5. Operator's work

6, cold rubber shooting marks

Design reason

Equipment

Material Cause 

1 material has impurities, foreign matter, rubber scratches

2. The material is not baked, the material scratches mold trace