Automatic control method of vacuum prepregs technology manufacture

Аuthors

Glebov I. V.^*, Kotenko V. D.^**

Moscow State Forest University, 1 Institutskaya str., 1, Mytishchi-5, 141005, Russia

*e-mail: glebov@mgul.ac.ru
**e-mail: kotenko@mgul.ac.ru

Abstract

Automatic control system is an integral part of any modern manufacturing techniques. Prepreg technology of production of composite materials is by far the most common and used. Prepregs for advanced composite materials, both structural and functional, are produced by various methods with a high degree of automation. However, there are a prepregs, production of which, even today, is the long method of impregnation of workpieces by immersion in the impregnating composition. This duration is due to the high requirements on the content of polymer in the prepreg and the uniformity of its distribution.

To accelerate the technological process of manufacture of the prepregs MSFU jointly with ZAO ZEM of RSC Energia. S. P. Korolev was developed vacuum technology repeated impregnation with intermediate vacuum dryers. However, the method of control of polymer in the prepreg is proposed in this technology not provides high accuracy and process automation.

The article describes the method of automatic control of the production process of a prepreg for the implementation of this technology. Control method is the constant monitoring of the weight of the impregnated preform on stages vacuum impregnation and vacuum drying. This allows from the mass difference, measured after a specified period of time, to determine the amount of impregnating composition arrived in the impregnation or the quantity of the removed solvent by vacuum drying.

For the implementation of this method uses a special impregnating chamber, equipped with a weighing system billet-based force sensors and the control system, which, by the calculated values, produces the inclusion of modes of vacuum impregnation and drying of the workpiece. For this, the system has various control circuits. The loop of temperature control maintains a constant temperature in the impregnation chamber. The loop of pressure control by opening and closing the electromagnetic valves connected to the vacuum line and the atmosphere, creates the necessary pressure chamber for the flow of process vacuum impregnation or vacuum drying of the workpiece. The contour control valve binder is using a servo drive to control the amount of binder which comes in workpiece that allows you to set a predetermined rate of impregnation.

The article presents the algorithm of the system control that can be applied in the software implementation.

Thus, the method of automatic control of the process of manufacturing the prepreg allows with high accuracy to control the parameters of the prepreg by to the content of the polymer and to smoothly control the production process to obtain the best distribution of the polymer on the area and the thickness of the prepreg.

Keywords:

control method, prepreg, vacuum impregnation, fiberglass, composite

References

1. Belenkov D.A., Novoselov V.G., Srov Yu.A., Ozerskii A.E., Aksel’rod S.A. Patent RU 2011511, 30.04.1994.

2. Postnov V.I., Petukhov V.I., Kavun N.S., Kotov O.E., Kukharev V.A. Patent RU 2302431, 10.07.2007.

3. Bykov A.I., Shestukhina S.N., Motorin D.V., Mukhin N.V., Vymorkov N.V., Chernyshov B.V., Fedotov B.T. Patent RU 2321606, 10.04.2008.

4. Postnov V.I., Petukhov V.I., Strel’nikov S.V., Veshkin E.A. Patent RU 2447097, 10.04.2012.

5. Polotna vyazal’no-proshivnye dublirovannye tekhnicheskogo naznacheniya. Tekhnicheskie usloviya, GOST 13863-89 (Stitch-bonding fabrics by technical purposes. Technical conditions. State Standart 13863-89), Moscow, Standarty, 1989, 11 p.

6. Laki bakelitovye. Tekhnicheskie usloviya GOST 901-78 (Bakelite varnishes. Technical conditions. State Standart 901-78), Moscow, Standarty, 2003, 15 p.

7. Strekalov A.F., Pashchenko V.A., Romanenkov V.A., Terekhin A.I., Kuznetsova L.N., Abrazumov V.V., Kotenko V.D., Sapozhnikov I.V., Redyanova E.V Patent RU 2484956, 20.06.2013.

8. Kotenko V.D., Abrazumov V.V., Sapozhnikov I.V., Romanenkov V.A., Kuznetsova L.N., Lesnoi vestnik, 2013, no. 1(93), p. 77-81.

9. Vargaftik N.B. Spravochnik po teplofizicheskim svoistvam gazov i zhidkostei (Handbook on thermophysical properties of gases and liquids), Moscow, Nauka, 1972, 720 p.

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