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Contact: Jacky Qiu: +86 150 1193 9995
Skype: df mold
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There are several factors that could cause a part to distort.
When considering the contributors to warpage, it is convenient to identify shrinkage due to:
- Variation in shrinkage from region to region (differential shrinkage).
- Temperature differences from one side of the mold to the other (differential cooling).
- Variations in the magnitude of shrinkage in directions parallel and perpendicular to the material orientation direction (orientation effects).
Each of these types of shrinkage will contribute to the total warpage of the product.
Differential Shrinkage
This type of shrinkage is often caused by variation in crystalline content and volumetric shrinkage. The following figure shows a thin rib attached to a thick top. In general, the cooling rate of the top will be lower than that of the thin section. The top will have increased crystalline content and therefore, will shrink more and cause the warpage shown.
The following figure (a) shows saddle warping of a centrally gated disk with high shrinkage around the gate. Conversely, if the shrinkage is higher around the outer part of the disk, the resulting warpage may cause the disk to dome, shown in (b).
Differential Cooling
Shrinkage due to differential temperature typically results in bowing of the component, as shown in the figure below. Usually this type of shrinkage is due to poor cooling system design.
While the part is in the mold, temperature differences from one side of the mold to the other cause variations in shrinkage through the thickness of the component. In addition to this, any temperature differences at ejection will cause further warpage as both sides of the part cool to room temperature.
Orientation Effects
Orientation causes variation in the magnitude of shrinkage in directions parallel and perpendicular to the material orientation direction. This type of shrinkage can produce warpage similar to that of differential shrinkage. Figure (a) below shows the warpage when parallel shrinkage is greater than perpendicular shrinkage. On the other hand doming can be produced if the perpendicular shrinkage is higher than parallel shrinkage, see (b).
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Specification: |
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Certificates |
ISO 9001 |
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Quality-guaranteed |
Japanese standard of QC management & Euramerican standards |
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Service |
Designing the mould, CNC processing and other tooling, assemble all mould parts |
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OEM & ODM service |
Acceptable |
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Design software |
UG, PRO-E, CAD, CAXA, etc |
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Mould base Standard |
LKM , HASCO , DME, etc |
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Moulds’ steel |
NAK80, S136(H), 2738, 718&738 and P20 etc |
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hardness of steel: |
15--60 HRC |
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cav/core material |
2738,2343,DIN-1,S130,2344,738H,718,8407,S136,NAK80,P20 etc |
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Cavity |
Single/multi |
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Runner |
Hot/cold |
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Mould life |
500,000-1,000,000 shots as you required |
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Final products’ materials |
ABS, PP, PE, POM, PA6(66)+GF, PC, PMMA HIPS, GPPS etc |
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Final Products’ colors |
Any color as your required |
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Lead Time |
2-6 months, depending on project requirements and final confirmation |
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Relevant requirements reachable |
Project-specific requirements to be reviewed and confirmed |
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Package |
Wooden case package or follow customers' requirement |
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Price Terms |
Delivery terms and port to be confirmed in the quotation |
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Payment term |
T/T, L/C at sight |
Details contact: Jacky Qiu Skype: df mold
Contact our Mold Engineer
Email: dfhk@dfmold168.com
Phone: +86 150 1193 9995
WhatsApp: +86 180 2632 3239
Working days: Monday to Friday.