DE3519623A1 - Process for producing a mangle bowl for bowl mangles - Google Patents

Abstract

In the production of mangle bowls 1 for bowl mangles, the bowl sheet 2 is first bent to form a half-shell and then welded on its outside 3 to a plurality of parallel heating shells 4 extending longitudinally. The heating shells 4 are thereafter welded to reinforcing elements 8 and the steam pipelines 6 and 7. The entire mangle bowl 1 is subsequently then annealed with low stress, and finally the bowl inner face is machined in a cutting manner, for example lathe-turned and/or ground. Before this cutting machining commences, the entire mangle bowl is heated at least to its later operating temperature and is also maintained at this temperature during the subsequent machining. <IMAGE>

Description

Method for producing a #ngelmulde for flatwork ironers

The invention relates to a method for producing a mangle trough for flatwork ironers, especially for large flatwork ironers with an ironer roller diameter of at least 400 mm, in which the trough sheet initially becomes a half-shell bent and then welded to a larger number of parallel heating trays, in which then the heating bowls with reinforcement elements and steam pipes are welded, whereupon the entire trough is annealed as well as stress relieved Finally, the inner surface of the trough is machined, e.g. turned and / or sanded, is.

The well-known #gelinulden for flatwork ironers are on the outside of the bowl plate shaped as a half-shell running parallel to the bowl axis, Arched sheet metal strips that form heating channels and overlap like scales welded on as so-called heating shells, due to their shape and arrangement at the same time should also contribute to a stabilization of the lack trough.

To further stabilize the shape of the hollow areas, In addition, the heating bowls have a larger number of web-like reinforcing elements welded, which extend essentially transversely to the longitudinal axis of the ironing trough and whose arc contour are adapted so that they contact surfaces with their arc edge for the outside of the heating bowls form and with each of the same can be firmly welded.

In practical operation of the flatwork ironers, the flatwork ironers become regular heated to a temperature in the range between 180 and 200 ° C.

Due to this heating, there is naturally an expansion of the material one that despite the stiffening caused by the heating shells and the reinforcement webs leads to a change in shape of the ironer troughs. This change in shape of the mangle money troughs is such that these spread apart in the area of their trough opening, and, as practical experience has shown, to a degree that is entirely within the Range of 5 mm.

Apart from the fact that due to this spreading effect a considerable Share of working area between the ironer trough and the ironer roller is lost, has also shown the disadvantage that the lack of laundry due to thermal expansion Spread out ironer trough not permanently flawless between ironer trough and The ironer roller runs in and the work result is permanently impaired as a result can.

From DE-AS 1 211 122 it is already known, one with high pressure steam heating to equip working ironer trough with power-driven lever gears to over this to bring about a shape retention adapted to the circumference of the ironer roller.

Apart from the fact that the known configuration is a considerable and makes costly additional effort necessary, the shape retention is through the lever gearbox either depends on their setting is constantly monitored or additional functional elements are necessary, which enable automatic adjustment.

The purpose of the invention is to create a mangle trough with as little effort as possible for flatwork ironers to be interpreted in such a way that they can be used in an optimal manner and without additional Manipulation ensures the most exact adaptation possible to the circumference of the ironer roller. Therefore, the invention is based on the object of a method for producing a Indicate lack trough for flat ironers of the type specified in more detail at the beginning, that in practical use an optimal contouring of the ironer trough relative to the Ironer roller guaranteed.

According to the invention, this object is achieved in a surprisingly simple manner Way in that according to the characterizing part of claim 1, the entire trough at least to their later operating temperature before starting the machining brought and kept at this temperature during the subsequent processing will.

It has been shown that deficiency troughs are created in this way that a perfect layer assignment at the working temperature of the flatwork ironers to the ironer roller have and also maintained.

According to the characterizing part of claim 2, the invention provides that the entire trough is heated to 200 0C and during its machining is also kept at this temperature.

It has been shown to be advisable if, according to claim 3, the heating medium in the heating bowls and the steam pipes even before the machining begins is filled.

In this case, either according to claim 4, the heating medium during processing become trapped in the heating trays and steam pipes. It does exist, however according to claim 5 also the possibility that the heating medium during the machining Processing deritngelmulde is constantly kept in flow movement.

The only figure in the drawing shows the structure of a mangle trough 1 shown for flatwork ironers. It consists of one bent into a half-shell Trough plate 2 of about 15 to 20 mm thickness, on the outer surface 3 parallel to Trough axis extending heating shells 4 are welded. These heating trays 4 are made made of curved sheet metal strips that overlap each other like scales, give the trough plate 2 increased dimensional stability and each through-flow channels 5 for the heating medium, for example high-pressure steam.

This steam can through the supply pipe 6 with a temperature of about 200 ° C and an operating pressure of 16 bar in the flow channels 5 of the Heating shells 4 are initiated, from where he successively all through-flow channels 5 is applied until it reaches the throughflow channel 5, which with the discharge pipe 7 is provided.

A row is used to further reinforce the ironer trough 1 of web-like reinforcing elements 8, which extend transversely to the longitudinal axis of the ironer trough 1 and have a contour adapted to the heating bowls 4 at one edge. These reinforcing elements 8 are at least with the individual heating shells 4 connected by welding points and serve in this way for stabilization the bending shape of the trough plate 2.

After first the heating shells 4, the reinforcing elements 8 and the steam pipes 6 and 7 with the trough plate 2 welded ## ind, the entire ironer trough 1 is annealed to relieve stress.

Before then the concavely curved inner surface of the trough plate 2 through Boring and / or grinding subjected to a final machining process is, the entire ironer trough 1 is at least to its later operating temperature So to a temperature of approx. 2000C #rbitzt and then that is, during the Maintained the duration of the machining at this temperature.

It is most useful to edit the Abngelmulde 1 in the Clamp the processing machine and then with a sufficient time interval before the start the machining process, the heating medium in the steam pipes 6 and 7 and the Fill heating trays 5. The heating medium can then be used during the machining process are enclosed in the heating trays 5 and the steam pipes 6 and 7, are therefore in the idle state.

It is particularly recommended, however, if the heating medium is used during the machining is constantly kept in flow motion, so that the same conditions prevail over the duration of the processing operation that later in practical use, i.e. when the ironing recess is inserted into the ironer 1 occur.

It has been shown that in the manner explained above Deficiency troughs can be created, which later work in a Optimally take account of the lack of troughs and thereby ensure long-term, flawless operation of the flatwork ironers.

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Claims (5)

Claims 1. A method for producing a M # gel trough for flat ironers, in particular large bowl ironers with an ironer roller diameter of at least 400 mm, in which the trough sheet is first bent into a half-shell and then welded to a large number of parallel heating shells in the longitudinal direction is, in which then the heating shells with reinforcing elements and Steam pipes are welded, whereupon the entire bracket trough is tensioned poorly annealed and finally machined the inner surface of the trough, e.g. turned and / or ground, is characterized in that the entire Defect trough (1) before the start of machining, at least to its later Operating temperature heated and during the subsequent processing on this Temperature is maintained. 2. The method according to claim 1, characterized in that the entire Mmngelaulde heated to 2000C and during the machining of its inner surface is kept at this temperature. 3. The method according to any one of claims 1 and 2, characterized in that that the heating medium in the heating shells before the start of machining (5) and the steam pipes (6, 7) is filled. 4. The method according to any one of claims 1 to 3, characterized in that that the heating medium during the machining of the inner surface of the trough is enclosed in the heating trays (5) and steam pipes (6, 7). 5. The method according to any one of claims 1 to 3, characterized in, that the heating medium during the machining process in the heating shells (5) and steam pipes (6, 7) are kept constantly in flow movement.