DE8702734U1 - Device for manufacturing parts for heat exchangers - Google Patents

Description

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Description

The innovation concerns a device for producing parts for heat exchangers, consisting of a pressing die (male die) and a punch holder (male die).

It is known to use a pressed part with a perforated base, with tubes then being soldered or welded onto the perforations. This creates a system for the passage of a medium, e.g. the medium to be cooled, while the coolant then flows around these tubes with media passage.

The manufacturing process involves soldering or welding the tubes and this can also lead to leaks.

P( It is now the task of innovation to create a device

which enables the one-piece pressing out of such elements.

The device according to the innovation for the production of parts for heat exchangers consisting of a press stamp (male die) and a stamp holder (female die) is characterized in order to solve this problem in that the preferably round press stamp has several press

pins onto which the suitably perforated press blank can be placed and the stamp holder, which is also preferably round, has corresponding holes with undercuts into which the press pins with a smaller diameter can be inserted, whereby the press blank flows out into pipe pieces of corresponding wall thickness in one piece with the remaining, perforated press blank base during forward pressing.

The press ram has a shoulder with an undercut running around the receiving surface of the press pins, into which the press blank flows during backward pressing, so that when released from the

Punch (male) from the holder (matrix) of the

The pressed part is pulled out of the mold. This edge bead on the pressed part, which is created by the undercut, can later be removed (turned off) with the protruding pressed edge.

Further details can be found in the following description of an embodiment.

A preferred embodiment of the device and of a compact is shown for example in the drawing and described below, namely:

Fig. 1 and 2 show the section through a press device open and closed and

F i 9· 3 an enlarged section of

Fig.2,

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F ' ig, 4 and 5

the perspective view of the front and back of a compact.

As can be seen from the drawing, the round press stamp 1 (male part) has several press pins 2, onto which the blank 3, which has been passed through, is placed - see Fig. 1 - and there are as many press pins 2 and holes 4 as the pressed part 5 is to receive pressed tubes 6, see Fig. 4 and 5. As can also be seen, the round stamp holder 7 has corresponding holes 8 with undercuts 9 - see Fig. 1, into which the press pins 2 with a slightly smaller diameter enter. Here, the blank 3 flows out into tube pieces 6 of corresponding edge thickness in one piece with the remaining, perforated pressed part base 10 when pressed forward in direction A - see Fig. 2. An enlargement of the situation during pressing is shown in Fig. 3.

The press stamp 1 has an undercut 11 set back from the receiving surface of the press pins 2 on a circumferential shoulder, into which (11) the press blank 3 flows during backward pressing in direction B, whereby the forward and backward pressing takes place simultaneously - see Fig. 2. If the stamp 1 is now released from the holder 7, the finished press 5 is pulled out with the pressed tubes 6 and then released from the stamp 1 by means of a stripper 12. The edge bead 13 on the press 5 created by the undercut 11 is hereby

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pressed and can be completely removed by turning off the protruding pressing edge 14.

Starting from the perforated blank 3, a pressed part 5 with a perforated pressed part base 10 and integrally formed tubes 6 is produced, which elements are shown in perspective view in Fig. 4 and 5. Such two elements at the pipe ends, e.g. connected by slip-on tubes and then inserted into a pipe casing 15 with supply and discharge nozzles, already produce a heat exchanger. The medium to be cooled can flow through the tubes 6, while the cooling medium flows in the outer pipe casing and flows around the tubes with supply and discharge via nozzles.

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Claims (5)

f - ' ! .· &iacgr;&Igr;&rgr;&Aacgr; jk Ni LAWYERS DR. RUDOLFIBAOEil^ilVLi-iNG. HELMUT HUBBUCH DIPL.-PHYS. ULRICH TWELMEIER WESTLICHE 29-31 (AM LEOPOLDPLATZ) 7530 PFORZHEIM cWEST-GBRMANY) &zgr; (07231) 102290/70·&bgr;&Rgr;&Agr;&Tgr;&Mgr;&Agr;&EEgr;&Kgr; TELEX 7B3929 patma d 21.01.1987 II/Wa Company Friedrich Kretz GmbH & Co. KG, 7530 Pforzheim-Eutingen Device for manufacturing parts for heat exchangers Protection claims: 1. Device for producing parts for heat exchangers, consisting of a press stamp (male part) and a stamp holder (female part), characterized in that the preferably round press stamp has several press pins onto which the suitably perforated press blank can be placed and the also preferably round stamp holder has corresponding holes with undercuts, into which the press pins with a smaller diameter can be inserted / whereby the press blank flows out here to form pipe pieces of corresponding wall thickness in one piece with the remaining, perforated press blank base during forward pressing. 2. Device according to claim 1, characterized in that the press ram has a shoulder running around the receiving surface of the press pins &bull; · ti Hl* i ·· · with an undercut into which the press blank flows during backward pressing. 3. Device according to claim 1 or 2, characterized in that the edge width at the undercuts of the holes in the punch holder is less than C.5 mm. 4. Device according to one of claims 1 to 3, characterized in that a perforated press blank is used, which can be pressed into a press with a perforated base and integrally attached pipe pieces. 5. Device according to claim 4, characterized in that the pressed part produced thereby has an inner peripheral edge bead on the bottom shoulder due to the undercut on the peripheral shoulder of the press die, which edge bead can be removed for the finished product. II i II · · ■ · to I * 4 9·