If we are running the screw and injection unit at 750 psi hydraulic we would get 750 x 14 52 or 10 890 psi leaving the nozzle and entering the mold.
Injection moulding machine tonnage calculation formula pdf.
It is necessary to select the molding machine that satisfies the capacity of the shaded area.
Knowing the shot weight of an injection mould tool is the first step in selecting a suitable screw and barrel assembly.
Injection molding determining clamp tonnage requirements the clamp unit of an injection molding machine is rated by the maximum amount of clamp force that the machine is capable of producing.
To your surprise the mold flashes.
Clamp force is required in order to keep the mold clo.
Where inlet temperature of material is 180oc.
Now the question arises as to why the flash occurred when a machine capable of tonnage higher than what was originally indicated was used.
The injection molding injection molding is a method of forming a plastic product from powdered thermoplastics by feeding the material through the machine component called the hopper to a heated chamber in order to make it soft and force the material into the mold by the use of the screw.
Just because a moulding machine can produce a clean looking part without flash it doesn t mean the clamp is enough.
This figure is the summary of the actual molding results in the past but basically it is based on the.
2 13 injection molding machine 15 2 14 injection molding machine 17 2 15 event processor of visual basic 25 3 1 process flow chart of simulation and experimental 30 mould calculation software 3 2 main window 33 3 3 type of machine window 33 3 4 main window 34 3 5 shot capacity calculation window 35.
Use the first calculator below to find the shot weight of an injection mould tool.
In injection molding finding the right tonnage can be tricky.
For any particular part there are a range of clamp tonnages than can produce parts that appear to be ok.
Simply put the wall thickness of the part was neglected in the calculations.
Effects of mold temperature and pressure on shrinkage 0 030 0 000 0 010 0 005 0 015 0 020 0 025 100 120 140 160 180 200 220 240 mold temperature f ldpe pp.
The proper injection capacity is found from the relationship of the molding machine capacity for the weight of 1 shot as shown in figure 1 1 2.
Plastising total prod sr no description of machine capacity 24 hrs in kg hr 1 blow molding machine 2400 100 00 100 00 a temp of material inlet 180o c.
