Plastic Injection Molding Automotive Parts

Chien Feng Yuan specialize in making a plastic injection mold, injection molding small parts, auto injection mould and have successfully collaborated with companies in these field. We have over 14 years' experience on this field which give us tremendous depth, experience & knowledge about molding. In our time helping clients with creating products and parts we've seen and done it all. Experience & expertise is important when it comes to manufacturing products.

 

Auto injection mould Overview:

"Automation involves the use of tools throughout the manufacturing process to enhance efficiency, speed, and precision in completing tasks. Collaborative robots and robotic arms are some automation tools that assist workers in their operations, while others operate autonomously to fulfill tasks independently. Smart automation in manufacturing ensures the safety of engineers and machine operators in high-pressure, large-scale production processes.

Automation tools in the injection molding process contribute to ensuring correct manufacturing, accurate measurements, and the completion of well-formed parts. Manual injection molding can often result in natural variations, leading to poor part quality or malfunction. Injection molding automation prevents appearance and structural defects by maintaining precision and delicately handling fragile components."

 

Injection molding applications:

Plastic injection molding is the preferred process for manufacturing plastic parts. Injection molding can be used to produce a wide range of items such as electronic enclosures, containers, bottle caps, automotive interiors, combs, and most other plastic products available today. Utilizing multi-cavity injection molds, it is well-suited for the mass production of plastic parts as multiple components can be produced in each cycle. Some advantages of injection molding include high tolerance precision, excellent repeatability, a wide range of material choices, low labor costs, minimal waste, and minimal post-processing required for molded parts. Some drawbacks of the process include the expensive upfront tooling investment and process limitations.

 

Applications include:

● Packaging

● Consumer goods

● Medical devices

● Electronics and telecommunications

● Mechanical parts (including gears)

● Most other common plastic products available today

 

Common molding defects:

Injection molding is a complex technology that may encounter production issues. These problems can be attributed to mold defects or, more commonly, to part processing (molding).

 

When designing injection-molded parts, keep these factors in mind, and remember that it's easier to avoid problems from the outset than to make design changes later on.

Molding Defects	Alternative Name	Descriptions	Causes
Splay marks	Splash mark/silver streaks	Circular pattern around gate caused by hot gas	Moisture in the material, usually when resins are dried improperly.
Stringiness	Stringing	String-like remains from previous shot transfer in new shot	Nozzle temperature too high. Gate hasn't frozen off.
Blister	Blistering	Raised or layered zone on surface of the plastic part	Tool or material is too hot, often caused by a lack of cooling around the tool or a faulty heater.
Burn marks	Air burn/gas burn	Black or brown burnt areas on the plastic part located at furthest points from gate	Tool lacks venting, injection speed is too high.
Jetting		Deformed part by turbulent flow of material	Poor tool design, gate position or runner. Injection speed set too high.
Polymer degradation		Polymer breakdown from oxidation, etc.	Excess water in the granules, excessive temperatures in barrel
Sink marks		Localized depression (In thicker zones)	Holding time/pressure too low, cooling time too short; with sprueless hot runners this can also be caused by the gate temperature being set too high.
Color streaks (US)		Localized change of color	Plastic material and colorant isn't mixing properly, or the material has run out and it's starting to come through as natural only.
Delamination		Thin mica-like layers formed in part wall	Contamination of the material e.g. PP mixed with ABS; very dangerous if the part is being used for a safety-critical application. The material has very little strength when delaminated as the materials cannot bond.
Flash	Burrs	Excess material in thin layer exceeding normal part geometry	Tool damage, too much injection speed/material injected, clamping force too low. Can also be caused by dirt and contaminants around tooling surfaces.
Embedded contaminates	Embedded particulates	Foreign particle (burnt material or other) embedded in the part	Particles on the tool surface; contaminated material or foreign debris in the barrel; or too much shear heat burning the material prior to injection.
Flow marks	Flow lines	Directionally "off tone" wavy lines or patterns	Injection speeds too slow (the plastic has cooled down too much during injection; injection speeds must be set as fast as you can get away with at all times.
Short shot	Non-fill/short mold	Partial part	Lack of material; injection speed or pressure too low.
Voids		Empty space within part (air pocket)	Lack of holding pressure (holding pressure is used to pack out the part during the holding time). Also mold may be out of registration (when the two halves don't center properly and part walls are not the same thickness).
Weld line	Knit line/meld line	Discolored line where two flow fronts meet	Mold/material temperatures set too low (the material is cold when they meet, so they don't bond).
Warping	Twisting part	Distorted part	Cooling is too short; material is too hot; lack of cooling around the tool; incorrect water temperatures (the parts bow inwards towards the hot side of the tool).

 

 

Packing Details : Carton, Wooden case, pallet, or according to the customers'

requirements.

Delivery Detail: 25-35 days by sea, 3-7 days by air

 

 

 

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