Boots – shoes – and leggings
Patent
1994-05-31
1996-08-27
Envall, Jr., Roy N.
Boots, shoes, and leggings
364148, 36447502, 264 401, 425135, G06F 1900, B29C 4576
Patent
active
055507441
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a method of controlling a machine for the manufacture of products, in particular for controlling an injection molding machine for the manufacture of plastic injection molded parts, wherein a learning cycle involves determining and storing characteristic data arrays which indicate the dependency of selected quality parameters of the manufactured products on selected setting parameters of the machine.
Machines are set nowadays by way of machine-specific setting parameters. In the case of injection molding machines they are for example the mass cylinder temperatures, speed of rotation of the screw, ramming pressure, through-flow quantity and temperature of a coolant or temperature-control medium, injection speed profile, hydraulic pressure in the injection cylinder, post-compression time, cooling time etc. Hitherto the function of the machine setter was to arrive at a possible or the best combination of setting values for the important setting parameters, in accordance with economic and qualitative points of view. The setting values afford process parameters (for example mass temperature, molten material pressure in the tool or screw supply chamber, injection work or flow index). Besides the mold portion and tool structure and the selected material (plastic material), those process parameters in turn crucially determine the features in respect of quality of the manufactured products. Those quality features can be described by numerical values, referred to as quality parameters, for example the mass in grams. However quality parameters and therefore numerical values can also be associated with other quality features such as for example dimensional accuracy, accuracy in respect of shape, surface area and further mechanical and optical properties. The quality parameters required in relation to a manufactured product and in particular an injection molded part are usually specified for example on the drawing of the molded part and/or in a specification, in the form of desired or target values or ranges of target values, that is to say target values with tolerance limits.
If consideration is given to the number of setting parameters and the combinations of the values thereof on the machine and the measured or evaluated values in respect of the quality parameters, it quickly becomes clear that quantitative assessment of dependencies which are partially known in qualitative terms cannot be mastered without aid, even for an experienced machine setter (injection molder). The result is that existing reserves in regard to quality and output are not utilised.
Therefore the object of the invention is to provide a method of controlling a machine for the manufacture of products of the kind set forth in the opening part of this specification, which makes control of the machine for the manufacture of products, with consideration of the prescribed quality parameters, substantially easier for the machine setter.
In accordance with the invention that is achieved in that, to control the machine, the reference values or reference value ranges for at least two selected quality parameters are inputted into a control means and that at least one set of selected setting parameters in which simultaneously all predetermined quality parameters correspond to the respectively predetermined reference values or lie in the predetermined reference value ranges is ascertained by the control means by reference to the stored characteristic data arrays.
Therefore the basic idea of the invention involves inputting the actual target parameters, namely the quality parameters, and computing therefrom, from the known characteristic data arrays, possible sets or the best set of setting parameters, in which all predetermined quality parameters are simultaneously attained.
The recording of characteristic data arrays or fields in a learning cycle which contain the dependency of one or more measured quality parameters on a plurality of setting or process parameters is already known from German laid-open application (DE-OS) No 39 27 995.
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Brown Thomas E.
Engel Maschinenbau Gesselschaft mbH
Envall Jr. Roy N.
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