DE1182193B - Cooling device on metal pipe presses - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Boarding school KL: B 21c

German AI .: 7b-10/80

Number: 1182193

File number: H39096Ib / 7b

Filing date: April 7, 1960

Opening day: November 26, 1964

The invention relates to a cooling device on the press mandrel of metal pipe presses, in which the Axial bore of the dome is connected to the coolant source and the outlet opening for the coolant has at the front end of the mandrel a loosely lying, forwardly liftable closure member.

In order to avoid that a extruded profile extruded on an extruder, in particular a path its hollow shape incomparably more difficult to manufacture pipe string at high outlet temperatures and different types of warming effects occurring at the same time, those on overcoming the Vet'-resistance to formation and the friction between the pipe string and the die-forming dies suffer an undesirable structural change, the extruded strand is cooled. The necessary cooling is based on the existing conditions with reference to the heat exchange to be coordinated, so that during the entire extrusion process - even if there are different Warmth conditions between the beginning and the mouth of the Äiispressens - / in spite of everything an optimally homogeneous one The structure of the entire extruded strand is achieved is to produce a product with the same strength properties as possible to obtain. .

In a known device 9 mentioned at the beginning Kind is the end of thorn with thorns, von'der Axial drilling of the dorrjes from diverging, fine Canals provided, the mouth of which on the f) ornstirnfläche can only be closed by a cap on top are. This is done for the purpose of protecting the fine channels from contamination. the press block is to be punched with the help of the dome.

At the start of pressing, the loose cap is ejected or taken away from the extruded pipe. Once this way is cumbersome and on the other hand it creates the connection between the mandrel and the dome lock completely resolved.

In the presence of such channels, the outflow quantity and the outlet cross-section are also limited not adjustable because the cross-section of all channels is fixed by the size of the holes. To the for others, even a large number of such channels is not enough to generate intensive cooling, because there are only single rays that are also fixed in their direction. Further will the closure is released from the end of the dome at a time when either the coolant is ineffective is sprayed or the coolant is only supplied when the cap is ejected. then it can happen that it is already too late for cooling devices on metal pipe presses

Applicant:

Hydraulics G. mb H ,,
Duisburg, Mülheimer Str. 72 ν

Related as inventor:
Hermann Prött _? 'Duisburg;;

adequate and intensive cooling. This is of increased importance, especially when cold-pressing full pipes and profiles, as in this process the cold pre-block is briefly heated to a relatively high temperature in the extra-ordinate large pressing density and high pressure speed. It is diesi-auHij ^ extremely fast overcoming; ^ the ^ yeftermüo ^ resistance and an extraordinarily high wall friction. The different high temperatures / ffö beginning and Ehderdfe ÄUspfeßvbrganges, the ffußerdem in verhärtöiämiälBfg'IflnierZeit e ^ ötetrbedfügt iq '^ besonderöiii fviiße ein'e'iCo mg that a) gleichblei6endeif öefügezus'tan'd de ^ ^ iSfzeügnisses ewlötr ¹ ieistltr Drfbjer'lnuß i & s iCöhhnittel% iMtfelbaf «
jöj dfes 8 ^τ ^

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Quantities are available -ueti :

further course of the dispensing process quantity-

"'The invention is based on the object that on Design the dome-located closure piece of the cooling device in such a way that the cooling device is able to dispense any amount of coolant at any point in time, which in hits the product in a closed jet and cools it intensively.

According to the invention, the closure member located in the mandrel end is designed as a spring-loaded in the firing direction Valve formed.

By increasing the pressure of the coolant, the closure member, which is designed in the form of a cone valve, is opened open against the spring force. The strength of the beam can duneh the increase of the Pressure of the coolant, which opens the valve accordingly, can be changed, with increasing pressure also at the same time the exit speed of the coolant changes. This will make a rapid growth the amount of coolant achieved when the pressure increases, which is achieved by the constant in front of the outlet opening

'"■' ■ ^{ '"*'" ^? 409 729/146

persistent valve body inevitably deflected from the axial to a more or less radial direction will. A relatively large amount of coolant hits the mold through the annular outlet opening a closed ring-shaped jet onto the S inner wall of the pipe profile created immediately beforehand.

With the mandrel already filled with coolant, the press block can be punched and then by means of the Stamp are squeezed out immediately, and coolant is also supplied directly, without the Special measures must be taken.

A cooling device is known for cooling the die, the inner surface of a pipe string produced, by means of an axially inserted through the pressed tube, arranged in front of the mandrel Nozzle to spray the inside surface of the product with coolant. The amount of coolant can be used in this Device can be regulated.

There is also known a device on metal extrusion presses with a spring-loaded valve; it deals However, it is a device for extracting the air trapped in the transducer. Here is a spring-loaded in the opening direction as Valve arranged with a ram, which is open until the start of pressing, so that the transducer is vented is, and only when it hits the press block, the valve is closed.

A transfer to the problem on which the invention is based has for reasons of different Function of the valve and its other types of influence not obvious.

The invention is shown schematically in the drawing using an exemplary embodiment explained in more detail; it shows

Fig. 1 shows a cross section through the transducer and the pressing tools of a pipe press before the start of the extrusion process,

F i g. 2 shows a cross section similar to FIG. 1, but in one position during squeezing.

A block 2 is inserted into the bore of the transducer 1. The ram 3 is located in the Starting position at the beginning of the extrusion process. The upstream press disk is denoted by 4. in the Tool holder, in the so-called cross slide, is the die backing 6, the die holder 7 with the press die 8 arranged. These parts are supported on the pressure plate 9.

The hollow mandrel 10, which is provided with a cone valve 11 in the front part, is inserted into the bore of the block 2. The cone valve 11 is housed in a screw-in insert 12 and closed by the force of a spring 13 which is supported on the piston part 11 a of the valve.

The bore 20 of the hollow mandrel 10 is filled with coolant, but this before the start of the pressing process (Fig. 1) is prevented by the valve 11 from flowing out.

As shown in FIG. 2, the valve 11 is opened during the pressing out under the controllable pressure of the coolant located in the bore 20 of the hollow mandrel 10; namely, the piston 11 a of the valve 11 is opened by the pressure of the coolant against the force of the spring 13, so that through the cone valve 11, which can be opened more or less, a closed annular jet on the inner wall of the pressed pipe 19 hits.

In addition, as shown in FIG. 1, for cooling the outer surface of the pressed tube 19, the coolant is sprayed through the line 14 via bores 16, 18 and annular spaces 15, 17 directly onto the outer surface of the tube 19 immediately behind the die opening 8 α .

Claims (1)

Claim: Cooling device on the press dome of metal pipe presses that come from the axial bore of the dome, which is connected to the coolant source, and the outlet opening of the coolant at the front The end of the thorn consists of a loosely lying one is assigned by the removable closure member, characterized in that the closure member is a valve (11) which is axially guided in the end of the mandrel and is spring-loaded in the closing direction Considered publications:
German Patent No. 1,032,206;
French Patent Nos. 438 457, 980 781; British Patent Nos. 547 080, 707 931;
U.S. Patent Nos. 927 076, 2,135,193. 1 sheet of drawings , 408 729 / 144-11, -64 φ BumWriniHrcrw Beriii