Ra soluciones dige ar tornillo ar máquina moldeo ya inyección

How does the máquina moldeo ya inyección screw unusual sound slip to do

If the screw begins to slip during the preforming phase, Yá 'ñäni axial ya ar tornillo ar detiene medida da ar tornillo continúa girando. Ir 'me̲t'o general, deslizamiento ar tornillo conducirá da degradación ya materiales 'bu̲ 'be̲tho ar moldeo ya inyección., ciclo procesamiento prolongado ne ma'ra ya hñäki ja ya ar producto.
Influence of process parameters
The low temperature at the back of the barrel is usually the main cause of the slippage of the plastic injection screw. The barrel of the injection molding machine is divided into three sections. At the rear of the feeding section, a thin layer of molten polymer is formed during the heating and compression of the material. The molten film layer is attached to the barrel. Without this thin layer, it would be difficult to move the pellets forward. The material in the feed section must be heated to the critical point to produce a critical molten film. 'Ñotho ar embargo, it is often the material in the barrel retention time is too short to enable the polymer to reach this temperature. This situation may be due to the equipment is too small, the corresponding configuration of smaller barrel and screw caused.
Too Short residence time can cause polymer melt or insufficient mixing, which will lead to screw slip or stop. Here are two simple ways to deal with this problem. A small amount of material is added from the end of the barrel for cleaning and the melting temperature is checked. If the residence time is short, the melting temperature will be lower than the set value of the barrel temperature. The second method is to look at the finished product and if it is found to be marbled, black-spotted or light-streaked, it indicates that the material is not well mixed in the barrel.
Impact of equipment

If the cause of screw slippage is caused by processing equipment rather than process parameters, then the wear of screw and barrel is likely to be the key problem. As with the feeding section, when the resin melts in the screw compression section, it adheres to the cylinder wall. When the screw is rotated, the material is sheared away from the cylinder wall and transported forward. If there are wear zones on the screw and barrel, then the screw can not effectively forward delivery of materials. If wear is suspected, the screw and barrel should be checked and the fit clearance between the two should be checked. If the screw and barrel clearance with more than the standard value, should start to replace or repair work. A failure of the check ring (check valve) can also cause the screw to slip. When the screw is rotated and plasticized, the reverse ring should be in the front (open) position and in contact with the fixing ring seat. If the Stop Ring is in a backward (closed) state, or between a forward and a backward state, the molten polymer will have resistance to pass through the gap between the Stop Ring and the ring seat.
If there is doubt about the Stop Ring, replace it immediately. The resin feed hopper can also be the cause of slippage in a variety of injection molding screws. Correct hopper design is the key to ensure stable delivery of materials, but this is often overlooked. Jar Nxoge, new pellets of uniform size work well in a square hopper with a sudden compression zone (with a sudden narrowing at the bottom) . 'Ñotho ar embargo, this is not the case when recycled materials are added. The shape and size of the pellets are very different after being crushed again, which will affect the uniformity of the feed. Incoherent feeding means that the screw can not maintain a uniform feeding pressure on the Melt, resulting in skidding. In order to solve this problem and solve the difference of the size between the recycled material and the new material, we can try to use a round hopper which has a flat compression zone (with a flat gradient at the bottom) .

1.The area of the mold opening hydraulic ring is too small
Mold opening force = mold opening oil pressure ring area × mold opening oil pressure
If you want to increase the mold opening force when the maximum pressure is determined, Ho̲ntho tsa̲ da aumentar ar área ar anillo presión asete apertura ar molde, and you can increase the mold opening oil pressure ring area by increasing the cylinder diameter or reducing the piston rod diameter.

Causes and countermeasures of Glue leakage in injection molding machine production

During the production of the injection molding machine, the products are produced under the situation of leaking glue due to some reasons, the heating ring is wrapped by Melt Glue, as the production time is prolonged, the heating ring is damaged, the hidden danger of the bad quality of the production products, etc. , the serious leakage of glue has wrapped the whole barrel, which results in a great deal of cost and a waste of maintenance time
In production, the NOZZLE (also called nozzle head) should be concentric with the gate sleeve of the mould, and the two spheres should cooperate closely, otherwise the glue will leak out. Jar Nxoge, the radius of the two spheres should be the same, but the spherical aperture of the nozzle is slightly less than 0.5 ~ 1mm of the gate sleeve, the coaxiality tolerance must be less than or equal to 0.25 ~ 0.3. The following is an analysis of the causes of leakage of Glue
1.The mould has no locating ring or the locating ring does not match the forming machine. When the mould is installed, the mould inlet hole and the gun barrel nozzle are not on the coaxality, and the position has a little deviation. Every time the mould is produced, a little bit of glue leaks out, there is no obvious change, but with the increase of production time, leakage will be more and more tired, the last leakage will slowly wrap around the heating ring;
2.The fixing screw of the nozzle turret is loose, so that the barrel nozzle and the Mould Gate are not at the same concentricity. When the nozzle is pressed against the mould gate, there is a little deviation in the position. When the mould is produced, a little glue leaks out, the same parts of the product, there is no obvious change, but with the longer production time, leakage will be more and more tired, the last leakage will slowly wrap around the heating ring;
3, the mold gate sleeve has the breakage situation, when the production injection nozzle and the mold gate sleeve can not be very close to fit together, each time injection glue, there will be a little melt glue flow out of the mold outside, as the production time lengthens, the leakage glue will be more and more tired, finally leakage on the heating ring slowly wrapped;
4, the nozzle mouth has the breakage situation, when the production nozzle and the mold gate cover can not be very close together, each time the injection glue, there will be a little melt glue flow out of the mold outside, as the production time increases, the leakage glue will be more tired, finally leakage on the heating ring slowly wrapped;
5.The R angle of the mold gate cover and the injection nozzle does not match, there will be a gap between the injection nozzle and the mold gate cover when the production is close, every time the injection glue, there will be a little melt out of the mold, as the production time increases, leakage of rubber will be more and more tired in view of the above situation,

there are the following countermeasures:
1, it is recommended that the mold is equipped with positioning ring, although no positioning ring will save its cost, but no positioning ring, not only has the potential to produce leakage of rubber, when changing the mould, the time of changing the mould will be lengthened, the cost of the heating ring will be saved if the heating ring is damaged by one time leakage of the glue, hand gun barrel shooting table forward, touch the mold, feel the nozzle and mold gate sleeve is in the same concentricity, also can use thin paper pad in mold glue mouth, the nozzle touch mold, and then exit, see whether the paper hole and the nozzle hole consistency;
2. Check the cause of loosening and fastening of the tightening screws of the Turret; the corresponding confirmation method: Before production, hold the turret shooting table by hand, when touching the mould, whether the handle shooting nozzle and the mould gate sleeve are on the same concentricity, also can use thin paper pad in the mold glue mouth, shoot the mouth after touching the mold, and then exit, see whether the paper hole and shoot mouth hole consistency;
3.Temporary solution due to mold gate cover and nozzle damage: use soft metal such as copper pad on the mold gate cover, nozzle forward contact with the copper plate top tight, back, after the nozzle hole in the nozzle position, permanent Countermeasures: The Corresponding Gate Sleeve or nozzle is re-polished, so that the R angle of both the gate sleeve and the nozzle on the Turret are in smooth contact with the production;
4.Glue leakage caused by mismatch of R angle of gate sleeve or nozzle, replace Gate Sleeve or Nozzle to keep the R angle of gate sleeve and nozzle consistent;

'Bu̲'bya, the causes and improvement methods of glue leakage in injection molding production mainly have the above several kinds, there is no good method of automatic detection of glue leakage in the production process, and the management can only increase the time period to inspect if there is glue leakage, with the continuous development of injection technology, will be developed in the future to automatically detect leakage of equipment, so that the production of INJECTION MOLDING MORE INTELLIGENT!