Injection molding machine screw in use for a period of time will wear problems.
So, what reason be cause of wear?
Vertical injection mold
ing machine manufacturer with everyone about the cause and wear today there are five main reasons.
Wear reason of screw, a total of 5 points, specific as follows: 1, each type of plastic, there is a ideal plasticizing processing temperature range, temperature should be controlled cylinder processing, make it close to the temperature range.
Granular plastic from the hopper into the cylinder, will first reach the feeding section, the charging period of inevitable dry friction, when the plastic is heated, fused inequality, very easy to cause the inner wall of the cylinder and the screw surface wear.
Similarly, in compression and homogenization, if uneven plastic molten state of disorder, can cause wear faster.
2, rotational speed should be proper calibration.
As part of the plastic with enhancer, such as glass fiber, minerals, or other filling material.
The material of metal friction often is much bigger than the molten plastic.
When these plastic injection molding, if with high speed, is in the increase of plastic shear force at the same time, will also strengthen accordingly produce more fiber is torn, torn fiber containing sharp end, the wear and tear strength increased greatly.
Inorganic minerals in the metal surface high-speed taxi, scraping effect is also not small.
So the speed shoulds not be too high.
3, screw rotation inside the barrel, friction material with both the screw and barrel of the surface of the work gradually wear: screw diameter reduced gradually, the barrel inner hole diameter increase gradually.
In this way, the matching of the screw and barrel diameter clearance, with the gradual wear and tear of the a little bit more.
, however, because of the barrel in front of the nose and shunt plate resistance has not changed, which adds to the forward extrusion material leakage flow, the material feeding direction from diameter clearance flow has increased.
Results decreased plastic machinery production.
This phenomenon and make the material stay in the barrel time increased, the material break down.
If it is polyethylene, decomposition of hydrogen chloride gas is used to strengthen the corrosion of the screw and barrel.
4, material such as calcium carbonate and the filling material such as glass fiber, can speed up the screw and barrel of the wear and tear.
5, as there is no uniform plasticizing, material or metal foreign bodies with material, to rotate the screw torque force suddenly increases, the torque beyond the ultimate strength of the screw, the screw twist off.
This is a kind of unconventional accident damage.
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