RU2289077C2 - Method of making heat exchange element - Google Patents

Abstract

FIELD: heating engineering.

SUBSTANCE: method can be used for warming premises up and it also can be used in structures of heat exchangers and during their production. Method of making heat exchanger is based upon formation of cone-shaped crimp seals onto plate by means of subjecting them to multi-operational elongation by stamping to remove bottoms of crimp seals. Then technological opening is made onto plate. The opening is made after first operation of elongation of any crimp seal at its bottom. After stamping of crimp seals and bottom removal operations are finished, cylindrical belt s made at ends of crimp seals. Riffles are made onto surface of plate.

EFFECT: elimination of cracks and neckings on surface plate during making of heat exchange element.

Description

The invention relates to heat engineering, and in particular to a technology for manufacturing heat-exchange elements used primarily for space heating.

A known method of manufacturing a plate (heat exchange element) of a plate-tube heat exchanger, according to which a hole (notch) is made on the surface of the plate, then the conical flanges (rifts) are drawn, which is produced by multi-transition stamping, and in the last stamping operation, the holes are punched and bent the tongue formed during the hole.

The notches on the plate are performed in the area of flanging, but not in their area. To determine the location of the notch, a tangent line is drawn at the border of the planned neighboring flanging, namely, the formed depression, in the area of which a hole should be punched. The perpendicular established to these tangent lines shows the direction of the ends of the notch, which is cut near the planned flanges, and this direction should not exceed 15 ° from the established perpendicular. Performing cuts before forming by stamping flanges on a plate helps to improve the redistribution of volumes of metal, which is pulled together in the formed rifts and protects the plate metal from forming during stamping flanges, cracks, snacks (see RF patent No. 2144445, class B 21 D 53/08, 1998) - the closest analogue.

As a result of the analysis of the known method, it should be noted that making cuts on the plate, the number of which is equal to the number of flanges, weakens the plate, including due to the appearance of thinning in its area, and also makes it difficult to make grooves on its surface, in addition, when forming flanges notches contribute to warpage of the plate, as they are concentrators of internal stresses.

The objective of the present invention is to develop a method of manufacturing a heat transfer element, eliminating the appearance in the manufacturing process of the heat transfer element of thinning and cracks on the surface of the plate.

This object is ensured by the fact that in the method for manufacturing a heat exchange element, which includes forming conical shaped flanges on the plate by multi-operation drawing by stamping to remove the flanging bottom and making a technological hole on the plate, it is new that the technological hole is made after the first drawing operation of each flanging on its bottom, after the operations of stamping flanges and removing the bottom, a cylindrical girdle is formed at their ends, and on the surface of the plate fill riffles.

When conducting patent research, no solutions were found that are identical to the claimed invention, and therefore, the claimed solution meets the condition of patentability "novelty."

The essence of the claimed invention does not follow explicitly from the known technical solutions, and therefore, the claimed solution meets the condition of patentability "inventive step".

The information set forth in the application materials is sufficient for the practical implementation of the invention.

A method of manufacturing a heat exchange element is as follows.

Initially, a workpiece (plate) of the required shape is obtained (the shape of the heat exchanger plate can be very different) with an allowance along the contour of the plate.

Then, conical flanges are formed on the plate, the number of which can also be very different (testing the technology was carried out on plates having two flanges, but this does not mean that their number can be different. The essence of the technology does not change from this).

Flanging is performed by multioperational stamping, by operationally drawing them.

So, in the first operation, the hoods carry out the initial formation of the flanging surface and their bottom.

Next, carry out the implementation of the technological holes in the bottom of each flanging. These holes can be stamped, after which, as a rule, a complete flanging profile is formed in a few operations. The amount of these operations can be different and depends, as a rule, on the type of plate metal, its thickness, and the size of the flanges.

After the flanges of the full profile are made on the plate, the bottom of the flanges (in which the holes are made) are removed and a cylindrical girdle is formed on each flanging.

Then, if necessary, the plate is corrected, after which allowances are cut along the contour of the plate, forming its final size, and riffling is carried out on it. The operation of editing the plate can be combined with the operation of performing riffles on it.

Making a hole in the bottom of the flanges after the first operation of drawing the flanges by stamping avoids violating the integrity of the flanges. In addition, and this is very important, since it is from the hole that the main redistribution of the metal volumes is carried out when the flanges are drawn, thinning of the metal is observed in the hole zone, violations of its structure, occurrence of cracks are possible, which sharply reduces the quality of plate production. In the proposed technology, it is this zone that is removed when making holes at the ends of the flanges.

Thus, making holes in the bottom of each flanging allows you to save a more uniform structure on the flanging surface, to avoid the appearance of cracks and thinning on its surface during subsequent drawing operations.

Cutting the workpiece with an allowance along its contour provides a plate with exactly the specified shape and size, since during multi-operation drawing of flanges, due to a significant redistribution of the metal masses of the plate, it is somewhat “pulled together” along the midpoints of the sides to its center. This allowance is removed after flanging.

The essence of the method of manufacturing a heat exchange element will be more clear from the following example.

It is necessary to manufacture a heat exchange element 130 × 90 mm in size with two flanges having an initial diameter of 27 mm and a taper of 5, the plate material is sheet steel 0.5 mm thick, grade 08 08 grade.

Material for plate blanks is stored in a roll.

Initially set the roll on the unwinding-correcting device and fill the beginning of the roll (tape) in the stamp.

In the unwinding-correcting device, straightening of the tape unwinding from the roll is carried out.

Next, die cutting by blanking of a rectangular-shaped plate with an allowance on the side of 10 mm is carried out, after which, for several operations, the formation on the dies by drawing out flanges is carried out.

In the second operation (the first operation of the hood), the initial shaping of the flanges is carried out with the formation of their conical surface and bottom. Next (the third operation), a technological hole is obtained in the bottom of each flanging. Holes punch on the stamp. In the fourth and fifth operations, the final formation of flanges is carried out. After receiving the flanges of a given profile and size, the bottom of each flanging is stamped (removed) (the sixth operation), after which the final formation of the cone and the formation of a cylindrical girdle on each flanging are performed (the seventh operation).

Next, the stamp is trimmed with allowances along the contour of the plate (the eighth operation), after which, in one operation (ninth operation), the plate is edited and the corrugations are formed on its surface.

The plate is finished.

It should be noted that the known equipment is used to make the plate. Modes of operations are also known.

Claims (1)

A method of manufacturing a heat exchange element, including the formation on the plate of flanges of a conical shape by multi-operation drawing by stamping to remove the bottom of the flanges and making a technological hole on the plate, characterized in that the technological hole is performed after the first operation of drawing each flanging on its bottom, after the end of stamping operations of the flanges and bottom removal is performed at their ends a cylindrical girdle, and on the surface of the plate perform grooves.