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(Aco Mold Co., Ltd - a good reputation company in China for custom plastic injection mold manufacturing.)
06-12-2014 06:32 下午
#1
Clamping Force Calculation
06-12-2014 08:41 下午
Top #2
Hi Jordi,
I guess every injection moulder would like to have such a list as holy grail for these calculations. Unfortunately it is still difficult to compile all data thats comes into play in a list. Its not just the material and projected area, it is also the application itself and processing parameters that play an important role. Is it a thin wall part? High injection velocities? What are the cycle time rquirements? Is the mold cooling (or heating) optimal? What kind of barrel do I have on the machine? etc etc. In other words, it makes more sense to look at the specific situation at hand (or maybe you can group it a bit such as thin wall packaging for example were high injection speeds and high cavity pressures are involved) rather than trying to calculate it from a list.. but who knows if somebody made a list......but I guess that list will be pages long. If you have specific info on parts whcih you investigating I am willing to help you out! Regards, Theo
I guess every injection moulder would like to have such a list as holy grail for these calculations. Unfortunately it is still difficult to compile all data thats comes into play in a list. Its not just the material and projected area, it is also the application itself and processing parameters that play an important role. Is it a thin wall part? High injection velocities? What are the cycle time rquirements? Is the mold cooling (or heating) optimal? What kind of barrel do I have on the machine? etc etc. In other words, it makes more sense to look at the specific situation at hand (or maybe you can group it a bit such as thin wall packaging for example were high injection speeds and high cavity pressures are involved) rather than trying to calculate it from a list.. but who knows if somebody made a list......but I guess that list will be pages long. If you have specific info on parts whcih you investigating I am willing to help you out! Regards, Theo
06-13-2014 02:15 上午
Top #3
Jordi,
How to calculate necessary force is not a correct question!
The correct question should include the degree of accuracy!
For example in small molding shops the question is usually: " is this machine big enough, or shall I go to the bigger?". So, the accurate figure is of no use (so, why should anyone invest to get it..). A relative calculation is usually enough.
At the most demanding end, the solution is simple. Get a mold flow simulation to get an accurate figure regarding the clamping force!
To perform an approximated flow simulation targeting the clamping force (i.e. accepting a lot of simplifications in the 3D model) is rather simple and fast.
How to calculate necessary force is not a correct question!
The correct question should include the degree of accuracy!
For example in small molding shops the question is usually: " is this machine big enough, or shall I go to the bigger?". So, the accurate figure is of no use (so, why should anyone invest to get it..). A relative calculation is usually enough.
At the most demanding end, the solution is simple. Get a mold flow simulation to get an accurate figure regarding the clamping force!
To perform an approximated flow simulation targeting the clamping force (i.e. accepting a lot of simplifications in the 3D model) is rather simple and fast.
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