September 22, 2023
Generally, ordinary molds are designed for at least 300,000 molds, and the lifespan of many molds can reach 1 million molds. Of course, they need to be well maintained. How to evaluate the service life of an injection mold?
First of all, we need to look at what kind of material the product is made of, which should be well defined when choosing a mold, and a mold core material suitable for this material should be customized. Generally, there will be a mold material report. The minimum required design number of 200,000 molds is estimated to be P20 or 45# steel, which is also the most common material.
|
Materials |
Hardness |
Characteristic |
Suitable for plastic materials |
|
S50C |
Pre-hardened HB170~220 |
Yellow brand steel, easy to process |
Commonly used plastic materials (templates) |
|
718H |
Pre-hardened HRC35~40 |
Pre-hardened, uniform hardness, easy to process |
Plastic products (mold cores) with small output and short mold opening cycle |
|
SKD61 |
HRC48~52 |
High temperature resistance, good quenchability, small deformation |
Commonly used plastic materials (mold core) |
|
NAK80 |
Pre-hardened HRC35~40 |
Good mirror effect and good welding performance |
Plastic products with small output, high appearance requirements and short mold opening cycle (small batch coating and electroplating mold cores) |
|
718H |
Pre-hardened HRC35~40 |
Pre-hardened, uniform hardness, easy to process |
Commonly used plastic crabs (mold kernels) |
|
S136 |
HRC50~54 |
High mirror surface, good polishability, rust and acid resistance |
Plastic products with high appearance requirements (painting, electroplating mold cores) |
|
718S |
HRC48~52 |
Good hardenability and small deformation |
Commonly used plastic materials (male mold core) |
|
GS738 |
Pre-hardened HRC35~40 |
Pre-hardened, uniform hardness, easy to process |
Commonly used plastic materials (locking block, guide slide block) |
|
S45C |
Prehardened |
General structural steel |
Commonly used plastic materials (templates) |
|
SKD11 |
HRC58~60 |
High CR steel, good hardenability and small deformation |
Commonly used plastic materials (mold cores) |
The second is the processing accuracy requirements, processing equipment, whether there is a fire, and whether there are obvious welding marks. Whether the design structure is reasonable and whether the movement is smooth. There is abnormal noise due to friction between various parts.
Finally, check whether the product has obvious defects, flash edges, and whether the full size meets the requirements. Even if the standards are met, it still depends on the subsequent maintenance and care, which is very important.
