Auto parts- Plastic molds with material PP , two cavities

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Plastic material

B3Z , Nylon+GF, PC/ABS, PBT+GF, PP, POM, PMMA Accordingly

3D Design Software

Solid works, NX, Pro-E, Auto-CAD(NX, Master CAM) for CAM Software

Mold Application

Automotive,electronic,industrial,architectural,medical,consumer & etc

Product Type:

Precision Injection Molding products for cars spare parts

Mold Cavity

Single mold, Multi cavity mold accordingly

Hot Runner

MOLDMASTERS, YUDO, HASCO, DME, INCOE, SYNVENTIVE

Mold Standard

HASCO, LKM, DME

Mold life

300,000-3,000,000 shots

Molding machines

20 injection machines from 50-160tons

Issue Solution example:

Warping

Description: Warping (or warpage) is the deformation that occurs when there is uneven shrinkage in the different parts of the molded component. The result is a twisted, uneven, or bent shape where one was not intended.

Causes: Warping is usually caused by non-uniform cooling of the mold material. Different cooling rates in different parts of the mold cause the plastic to cool differently and thus create internal stresses. These stresses, when released, lead to warping.

Remedies:

1. Ensure that the cooling time is sufficiently long and that it is slow enough to avoid the development of residual stresses being locked into the part
2. Design the mold with uniform wall thickness and so that the plastic flows in a single direction.
3. Select plastic materials that are less likely to shrink and deform. Semi-crystalline materials are generally more prone to warping.

This part for car rearview:

Burn Marks

Description: Burn marks are discolorations, usually rust colored, that appear on the surface of the injection molded prototypes.

Causes: Burn marks are caused either by the degradation of the plastic material due to excessive heating or by injection speeds that are too fast. Burn marks can also be caused by the overheating of trapped air, which etches the surface of the molded part.

Remedies:

1. Reduce injection speeds
2. Optimize gas venting and degassing.
3. Reduce mold and melt temperatures.

Jetting

Description: Jetting refers to a situation where molten plastic fails to stick to the mold surface due to the speed of injection. Being fluid, the molten plastic solidifies in a state that shows the wavy folds of the jet stream on the surface of the injection molded part.

Causes: Jetting occurs mostly when the melt temperature is too low and the viscosity of the molten plastic becomes too high, thereby increasing the resistance of its flow through the mold. When the plastic comes in contact with the mold walls, it is rapidly cooled and the viscosity is increased. The material that flows through behind that viscous plastic pushes the viscous plastic further, leaving scrape marks on the surface of the finished product.

Remedies:

1. Increase mold and melt temperatures.
2. Increase the size of the gate so that the injection speed becomes slower.
3. Optimize gate design to ensure adequate contact between the molten plastic and the mold.

Flash

Description: Flash is a molding defect that occurs when some molten plastic escapes from the mold cavity. Typical routes for escape are through the parting line or ejector pin locations. This extrusion cools and remains attached to the finished product.

Causes: Flash can occur when the mold is not clamped together with enough force (a force strong enough to withstand the opposing forces generated by the molten plastic flowing through the mold), which allows the plastic to seep through. The use of molds that have exceeded their lifespan will be worn out and contribute to the possibility of flash. Additionally, excessive injection pressure may force the plastic out through the route of least resistance.

Remedies:

1. Increase the clamp pressure to ensure that the mold parts remain shut during shots.
2. Ensure that the mold is properly maintained and cleaned (or replaced when it has reached the end of its useful lifespan).
3. Adopt optimal molding conditions like injection speed, injection pressure, mold temperature, and proper gas venting.

A large number of the defects mentioned above can be prevented in the design process by incorporating proper tooling design into the iterative process. Using moldflow software will help you identify ideal gate locations, anticipate air pockets, flow or weld lines, and vacuum voids. Most importantly, it will help you design solutions to these problems ahead of time, so that when it comes to production you do not have to worry about the defects costing you money.

FAQ:

1.Why choose GOM?

High Quality and short lead time with best engineering service to bulid long-term business relationship with customer.

2.What GOM service?

-Components manufacturing

-Plastic molds building

-Injection producing

-Painting & Plating

-Assemble

-Engineering support

3.How to control the quality?

Every process finish must make the measurement by CMM and should be passed then can do the next process.

4.How to provide after-serivice on the overseas?

We have 3 Parters in different area can deal it, in Mexico,Czech and Spain.

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Our Main Services:

1. Plastic molds:

Hot runner mold, precision mold, over mold, two-shot mold, unscrewing mold, multi-cavity mold, IML/IMI mold, Stack mold, Die-casting mold, etc.

90% molds exported to North America, South American, Europe and Australia.

2. Injection Molding:

We have rich experience in molding various engineering grade resins:

ABS, PC, PC+GF, PC/ABS, PBT, PA6+GF, PA66+GF, PPS, PU, PP, PE, TPE, TPU, LCP, Ultem, etc.

3. One Stop Services

Based on our strong engineering capability,GOM provide a full turnkey solution for customers bespoke plastic

injection moulding needs inclusive of design, development, mould tooling, production and post moulding support.

• 3D Scanning

• Prototype

• Painting

• Pad-printing

• Silk-Screen Printing

• Hot Stamping

• Plating

• Color Match

• Ultrasonic Welding

• Automation

• Production Line Assembly

• Precision Metal Parts

• Die casting Parts