RU2566699C2 - Method of heat levelling of metal sheets and device for its implementation - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: package of metal sheets is placed between the flat grinding plates, compressing the package by means of studs, then the assembled device is uniformly heated in the furnace up to the temperature of plasticity of the levelled metal, then the whole device is taken away and cooled down. After extraction from the furnace the cooling of the device with package of sheets is performed, thus providing conditions for faster cooling of studs that causes occurrence in studs of thermal stresses considerably strengthening the compression of sheets, keeping plasticity because of slowed-down cooling. For implementation of this method the device is used which comprises two massive flat polished plates fitted along the contour with holes into which the studs are inserted compressing the package of sheets made with the through holes used for faster, than of the package of sheets, cooling of studs.

EFFECT: improvement of quality of levelling of metal sheets.

2 cl, 5 dwg

Description

The invention relates to mechanical engineering, mainly to the exact.

In modern precision engineering, electronic modules are widely used, which include flat metal substrates. If the substrate is not flat, then spraying different layers, it will not be possible to achieve flatness, since the same “waves" of the surface will be covered with an equal thickness layer of the sprayed material. And for the installation of electronic components, the planarity (flatness) of the surface on which the installation is carried out is one of the important parameters.

The following methods are known for aligning the geometric irregularities of metal plates: mechanical planarization (for example, milling), the most common and used is the method of chemical-mechanical planarization, plasma planarization. In all these methods, a metal layer is removed from the surface of the plate (in the latter method, due to evaporation) (http://ru.wikipedia.org/wiki/%D0%A5%D0%B8%D0%BC%D0%B8%D0 % BA% D0% BE-% D0% BC% D0% B5% D1% 85% D0% B0% D0% BD% D0% B8% D1% 87% D0% B5% D1% 81% D0% BA% D0% B0% D1% 8F_% D0% BF% D0% BB% D0% B0% D0% BD% D0% B0% D1% 80% D0% B8% D0% B7% D0% B0% D1% 86% D0% B8% D1% 8F,

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There are also various methods of thermal straightening, one of which (SU 352953 A1) is selected as a prototype.

The proposed method of thermal straightening differs from the prototype in that the heating of rectangular or round metal sheets (this can be one sheet), placed between flat, compressing the package plates, is heated by placing the assembled device in the furnace to uniformly heat it to the ductility temperature of the metal being machined, and cooling after extraction from the furnace is carried out selectively, providing conditions for faster cooling of elements, for example, studs, clamping the straightened sheets, which causes occurrence in the spire kah thermal stresses, significantly enhancing the compression of sheets, preserving plasticity, due to delayed cooling.

To implement this method, a device can be used, which consists of two massive flat polished plates, provided with contours of openings into which are inserted a clamping packet of sheets of studs equipped with through holes for cooling the studs, and the device allows air to pass through the channels due to natural convection, and due to forced air blowing from the air network.

It is very important that in the present invention provides a clamping force of the plates up to 250 tons and even more.

The technical result of the invention is the expansion of the arsenal of technical means of planarization of metal plates.

Figure 1-5 simplified illustrate an example implementation of the proposed method:

1. Take a flat massive polished plate 1, provided along the contour of the holes (figure 1).

2. Place a package of metal sheets 2 on this plate (figure 2).

3. In the holes of the plate insert the studs 3, equipped with holes that serve to cool the studs (figure 3).

4. Place the second flat massive polished plate 1 on top of the package so that the studs fall into its holes, and clamp the straightened sheets (Fig. 4).

5. The assembled device is placed in a furnace to uniformly heat it to the ductility temperature of the metal being straightened.

6. Remove the device from the furnace and carry out either natural convection of air or forced blowing of air through the through holes in the studs from the air network (figure 5).

Claims (2)

1. The method of thermal expansion of metal sheets, including placing a package of metal sheets between flat polished plates with clamp pins, uniform heating of the assembled package in the furnace to the plasticity temperature of metal sheets, its removal and cooling, characterized in that it selectively cools the assembled package of metal sheets to provide more quick cooling clamping pins than cooling a package of metal sheets. 2. Device for thermal straightening of metal sheets, containing two flat polished plates with holes along the contour, studs for clamping a package of metal sheets, made with the possibility of installation in the holes of the said plates, characterized in that the studs are made with through holes, which allow faster cooling of the studs than a pack of metal sheets.

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