DE3213712A1 - METHOD AND DEVICE FOR PRODUCING ELBOW TUBES - Google Patents

Description

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Applicant: Oy W. Rosenlew Ab

5 »« 1 01 Pori 10
(Finn I and)

Dilapidated and apparatus for the manufacture of snail pipes

The present invention relates to a method for the production of arc tubes from blanks.

Today, curved tubes are made from two deep-drawn halves that are joined by welding. Before welding, the longitudinal connecting surfaces of the halves must be machined. The process is quite slow and uses a lot of raw material. When using expensive raw materials, such as corrosion-resistant and acid-proof steel, the waste material also causes significant additional costs. With the current process, the scrap pieces are very difficult to use in terms of shape, so that after pulling, only scrap is actually left. The required to connect the halves Schwt ¹ i'.sung weakens ausscrdem the Bo <jenrolir.

It has also previously been proposed to make curved tubes by bending produce straight pipe blanks with the help of a hinge mandrel. One such However, the method is only suitable for relatively small, thick-walled and slightly curved arched tubes.

This invention is based on the object of a method for the production of curved tubes from a blank directly in one piece to detect. This object is achieved with an inventive Process done, which process is characterized in that the blank is deep-drawn along a curved axis corresponding to the curvature of the curved tube to be produced to form a curved tube and that the ends of the bent pipe will be leveled afterwards.

The inventive method is based on the idea that the arc tube directly into the final bent tube shape is made. No welding or other processing than the Machining of the pipe ends required. Due to the failure of the weld seams, the compressive strength of the pipe is better. The reduction in the number of operations, also reduces the need for intermediate storage.

The drawing of the board can either be as simple deep drawing or Reverse pulling can be performed, whereby the pulling of the board is done in two opposite directions at the same time.

The invention also relates to an apparatus for implementation of the method described above and this device is characterized in what is presented in the third claim.

The device according to the invention has the following advantages:

- Compared with the current devices, the loss of raw material is less than half at best. In addition, the fet out The piece to be cut off the pipe end, as far as the shape is concerned, round and easier to use e.g. as a plate for another drawing.

- All pipe angles from 0 to 90 can be used with the same device, can only be produced by changing the board format.

- Elbow pipes with different thicknesses can be produced with the same nominal diameter, just by changing the thinning ring will.

- The production time is shorter because an arch pipe with each Zugschlag is produced.

61 I J712

The invention is explained in more detail below with reference to the attached Drawings described in which

Figures 1 and 2 show an advantageous embodiment of a deep-drawing device according to the invention as a front view and correspondingly as a vertical section in side view,

Figure 3 shows the drive members of the device schematically,

Figures h to 6 show schematically different operating phases of the device in the manufacture of curved tubes by reverse drawing »and

FIG. 7 shows a deep-drawn arched tube before the leveling process the ends shows.

The deep-drawing device shown in the figures of the drawings comprises a housing 1, a curved stop 2, a curved punch and drive elements h.

The stop 2 consists of a solid piece with a circular Cross-section, the central axis A of which forms an arc of a circle and which is attached at one end to the housing, extending upward in an arc.

The punch 3 consists of a hollow part with an annular cross-section, the central axis A of which is a 90 ° circular arc with the same radius as the arc of the stop forms and which is attached to a support disk 5. The support disk is pivotably attached to the housing 1 with the aid of a horizontal pivot axis 6 so that the central axis of the The punch 3 lies on the extension of the central axis of the stop 2.

The drive elements 4 of the device include a cylinder 7, which is mounted on the support disk of the punch at point 8 and whose task is to remove the punch from the punch shown in FIG Starting position of deep drawing down by 90, to the stop and back to pivot into the starting position. The drive organs also include a high-speed cylinder 9, with the help of which the punch from the mentioned Starting position can be pivoted through 90 into the ejection position shown in FIG.

Leaning against the housing are also at the level of the upper stop

end, a pull ring 10 and a retaining ring 11 mounted. At the bottom A tip ring 12 and a thinning ring 13 are mounted on the punch. All parts 2, 3 and 10 to 13 involved in deep drawing are after from deep drawing principles known per se according to the desired The diameter of the arched pipe in question and the wall thickness are dimensioned. The dimensions, the shape and the space of the thermoformed Blanks are to be selected in such a way that the asymmetrical material requirements of the curved pipe are taken into account.

The device works in the following way:

The board is inserted into a fixed gap (figure k) between the pull ring and the retaining ring. The hollow punch 3, pushed by the working cylinder 7, rotates around the pivot axis 6 and begins to pull the plate in the form of a shell 15a with a curved axis into the opening of the pull ring (FIG. 5). At the same time, the stop 2 is in relative motion into the punch 3 and pulls the resulting shell into the shape of a new shell 15b with a smaller diameter and a curved axis into the tip ring 12 of the punch and further into the thinning ring 13 (FIG. 5). The thinning ring forms the blank into its final size and shape in the interior of the hollow punch. When the punch has been pivoted by the required angle, in this case by 90 °, the working cylinder 7 starts in the return, which movement is continued by the high-speed cylinder 9 after the working cylinder has passed over to idle. The deep-drawn curved tube 15c (FIG. 7) can now be removed from the back of the hollow punch. Finally, both ends of the bend tube 15c are machined to level by machining the surfaces dd along.

It is found that you can use the method described and the device can produce a curved tube in one piece by deep drawing it with one blow directly to form a tube with a curved axis.

The device can either be used as a stand-alone device in the production of large curved tubes or as one in a press arranged tool used in the manufacture of small curved pipes.

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leads to be. It can also be thought of by the device To supplement breakthrough and straightening devices for the floor and a demarcation arrangement for deep-drawing waste, the product with a single stroke is completed. For the purpose of equalization of the form forces and reducing the maximum force, the pull ring can be arranged so that the first pull is almost to the end or at least over its maximum strength has advanced before the second pull phase starts.

The drawings and the accompanying description are intended to only to illustrate the idea of the invention. In detail can the inventive method and the device for its Execution even vary significantly within the scope of the claims.

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Claims (5)

. . ... .... patent attorneys A 19 634 ': ·.: · J ' · . * -. * ·: Wpl.-Chem. Dr. RUFF Dipl.-Ing. J. BEIER.: ** · ^: ,. ** · * '.. * · .-' ,. Dlpl.-Phye. Schondorf Neckarstrasse 50, D-7000 Stuttgart 1 Applicant: Oy W. Rosenlew From ₅
28101 Pori 10
(Finland) Sponsorship claims Method for the production of curved tubes from a blank, characterized in that a blank (IA) of a, the curvature of the curved tube to be produced corresponding curved Axis (A) along, is deep-drawn into a bent tube (15c) and that the tube ends are then machined to level. 2. The method according to claim!, Characterized in that that the deep drawing of the board (1 ^) of the bent axis (A) along, as reverse pulling at the same time in opposite directions is performed. 3. Apparatus for carrying out the method mentioned in the first claim for the production of curved tubes from a plate (1Ό, which arrangement comprises a housing (1) and the housing-borne molding tools (2, 3) for forming the plate, characterized in that they have a curved punch (3) corresponding to the curvature (A) of the curved tube (15c) to be produced and a curved stop (2), drive elements (h) for moving the punch and the stop into each other along their curved axis (A) and means (10, 11) for guiding the board between the punch and the stop includes. H. Device according to patent claim 3, characterized in that the curved hollow punch (3) is mounted on the housing (1) pivoting about an axis of rotation (6), which axis runs through the center of curvature of the punch at an angle to / around the level of the punch axis (A) and that the curved stop (2) is mounted so firmly on the housing (1) that the axis (A) of the stop forms an extension of the punching axis (A). 5. Device according to claim h, characterized in that the bent punch (3) is provided at its free end with a tip pull ring (12) and, if necessary, with a thinning ring (13) and that on the housing (1), at the free end of the stop (2), a pull ring (10) surrounding it and, if necessary, a retainer (11) are mounted.