What is claimed is:
1. A method of setting parameters for the injection molding machine comprising:
combining an experimental design method with a moldflow analysis software to simulate the real injection molding processes of the injection molding machine, analyze the simulation results, and develop a database for the quantitative relationship between the parameters of the injection molding machine and the parameters of the injection molding product quality;
developing a neural network which can predict the qualities of the injection molding products based on the database;
inputting the undetermined parameters to the developed neural network; outputting the predicted parameters of the injection molding product quality from the injection molding machine.
2. The method of setting parameters according to claim 1, wherein said simulation is carried out with the parameters of the injection molding machine taken to be within the upper and lower thresholds (or parameter window) according to the Taguchi Parameter Design Method; said upper and lower thresholds of the parameters of the injection molding machine are provided by the moldflow analysis software.
3. The method of setting parameters according to claim 1, wherein said parameters of the injection molding machine include at least the cooling time, the pressure-holding time, the held pressure, the injection speed, the molten-plastic temperature, and the mold temperature.
4. The method of setting parameters according to claim 1, wherein said parameters of the injection molding product quality include at least the output weight, the maximum volume shrinkage, the average volume shrinkage, the maximum sink mark, and the average sink mark.
5. The method of setting parameters according to claim 1, wherein said neural network is the radial basis function neural network.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1-14. (canceled)
15. An aerator for aerating water that comprises a distribution system for distributing air below the water surface and a compressor with an air inlet and at least one air outlet, whereby the compressor is configured to be placed below the water surface by this compressor being provided with a housing that prevents the infiltration of water into the compressor, whereby the infiltration of water at the air inlet is prevented by an intake pipe being provided of which one open end is above the water surface and the other open end has a watertight connection to the compressor, whereby the infiltration of water at the air outlet is prevented because the distribution system has a watertight connection to the air outlet and, due to its nature or by at least one valve, can hold back water and whereby the housing is in thermal contact with the water to cool the compressor, wherein the compressor is a centrifugal compressor that comprises an impeller that is driven by a shaft that it is mounted on air bearings, magnetic bearings or both.
16. The aerator according to claim 15, wherein the distribution system comprises at least one diffuser.
17. The aerator according to claim 15, wherein the distribution system comprises at least two distribution arms leading away from the compressor, each equipped with at least two diffusers.
18. The aerator according to claim 16, wherein at least one distribution arm is provided with a sidelong branch that is equipped with at least one diffuser.
19. The aerator according to claim 15, wherein the shaft is provided with a cavity extending in the length of the shaft, and that the compressor is provided with an air channel that runs from the pressure side to the intake via the cavity.
20. The aerator according to claim 15, wherein the compressor and the distribution system are arranged so that they can rotate around a vertical axis.
21. The aerator according to claim 20, wherein the distribution system is equipped with a nozzle with a direction that has at least a component perpendicular to the radial direction.
22. The aerator according to claim 20, wherein the aerator rests on a turntable that is intended to rest on the bottom of a reservoir in which the water is located.
23. The aerator according to claim 15, wherein the air intake andor air outlet of the compressor are positioned below the motor and the impeller.
24. The aerator according to claim 15, wherein the aerator can be taken out of the water as a whole by using a handle that is attached on top of the aerator.
25. The aerator according to claim 24, wherein the distribution system is connected to the compressor in a way that is self-supporting, or support means are provided on the aerator to support the distribution system.
26. The aerator according to claim 23, wherein the connections between the compressor and the intake pipe and between the air outlet and the distribution system are detachable, whereby a valve in each of the intake pipe and the distribution system prevents the infiltration of water.
27. A water purification plant that comprises at least one basin for water that has to be aerated, wherein a component of the water purification plant is an aerator according to claim 15.
28. A use of an aerator according to claim 15 for introducing air into wastewater to be purified.
29. The aerator according to claim 16, wherein the distribution system comprises at least two distribution arms leading away from the compressor, each equipped with at least two diffusers.
30. The aerator according to claim 17, wherein at least one distribution arm is provided with a sidelong branch that is equipped with at least one diffuser.
31. The aerator according to claim 21, wherein the aerator rests on a turntable that is intended to rest on the bottom of a reservoir in which the water is located.