DD205347A1 - DEVICE FOR PUNCHING LANGLOECHERS IN STEEL TUBES - Google Patents

Abstract

The invention relates to a device for punching elongated holes in steel pipes whose longitudinal sides are parallel to the tube axis and wherein no die is used in the tube interior. While the goal is to machine pipes of varying dimensional accuracy with high dimensional accuracy and quality, the object is to prevent the permanent deformation of the material by the stamping process. The task is solved with ellipsoidal shaped vertically divided half shells of the receptacle of the tube in the device and with a punch which is ground on one side of the cutting surface by about 10 degrees. The invention is particularly suitable for the production of support frames of Foerdertechnik and vehicle construction.

Description

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Title of the invention

Device for punching elongated holes in steel pipes

Field of application of the invention:

The invention relates to a device for punching slotted holes in steel pipes whose longitudinal sides are parallel to the pipe axis.

Characteristic of the known technical solutions:

For the production of steel tubes with punched slots, which are widely used in the art, for example, for frames, racks or the like, so far mainly methods and devices are known which use matching dies to the punches inside the tube. (e.g., DE-OS 22 31 517 and 26 32 713) Especially when several holes are to be punched in the tubes simultaneously, the devices used become very complicated and expensive. (DE-OS 26 44 130) In devices of this type also exist problems in the removal of the punched out of the pipe wall material from the tube and with respect to the adjustment of the die under the punch.

To avoid these disadvantages, a device is already used, which manages without die in the tube interior.

(WP B 21 D 218 572),

This device consists of a fixed to the punch punch holder with punch, at the same time by means of springs depending on the tube diameter formed as a semi-circular half-shell receiving upper part is attached.

The likewise formed according to the auszustanzenden tube as a semi-circular half-shell receiving base is mounted on the press plate (anvil). The half-shell of the receiving upper part has the shape of a concave isosceles obtuse angle,

The pipe to be machined is placed in the receiving base and first stretched by lowering the punch through the receiving shell and then carried out the punching process.

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However, this device is only suitable for machining precision steel tube with high dimensional accuracy. When machining, for example, so-called "black gas pipe" with low dimensional accuracy occurs too large deformation of the material in the region of the punch hole, associated with local bursting of the weld ', which means a reduction in quality.

Object of the invention

The solution according to the invention has the goal to develop a device for punching longitudinal holes extending along the tube axis, with which tube can be processed with different dimensional accuracy, with high dimensional accuracy and quality.

Explanation of the essence of the invention

The invention has for its object to provide a device in which the permanent deformation of the material is prevented by the punching process.

According to the invention, this object is achieved in that the device has the following features:

- A vertically split receptacle for the tube with halbellipsoid shaped half shells, which are pressed by means of a clamping element against the pipe to be processed; - At the main vertex (S ₁ ) of the recording a cutout in the shape and dimensions of the punch for passing through the same;

a stamping punch which, for the purpose of optimum cutting behavior, is unilaterally connected to the cutting surface by approximately 10 °,

Au3führungsbeispiel

The invention is explained in more detail below using an exemplary embodiment:

In the accompanying drawing show:

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Fig. 1 - A S _c hnitt by the apparatus for punching Langlächern in steel pipes with an inserted tube.

Fig. 2 - A section according to Figure 1 with strained device and completed punching.

Fig. 3 - A section through the device for punching slotted holes in steel tubes in the Seitenansieht during the punching process with the punch

stamp.

The device consists of a vertically split receptacle 2 '. _t in which the pipe to be machined 1 is inserted.

The vertically split receptacle 2 has two half ellipsoidally shaped half shells 3 ·

The main peak (S _1), the vertically divided pickup 2 has a milled-out portion 5 for passage of the punch 6 x The dimensions of the cutout 5 correspond to the cross-sectional dimensions of the punch 6. The clamping element 4, the two semi-ellipsoid shaped half-shells 3 for carrying out the punching operation, be braced against each other. · '·''''

The device according to the invention is used as follows: The tube to be punched is inserted between the half-shells 3 of the receptacle 2 in the region of the punch-out to be performed. By means of the clamping element 4, the half-shells of the receptacle 2 are firmly clamped to the tube 1. This is the tube. 1 ellipsoidal deformed according to the recording 2 and there is a significant increase in the moment of resistance at the relevant point. Subsequently, the punching of the slots or by means of the punch 6, which is guided by the cutout 5 at the main vertex (S ₁ ) of the receptacle 2. The press stroke is fixed in a known manner with attacks'; so that depth of cut and return stroke is guaranteed.

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To achieve optimum punching behavior, a cutting angle of preferably 10 ° on the punch 6 has proven to be advantageous. Finally, the receptacle 2 is relaxed and the tube 1 is removed from the device. 5

Due to the elliptical clamping of the tube in the device according to the invention is a permanent deformation of the tube ¹ during the punching process; associated with local bursting of the weld prevented. There is no deterioration in the quality of the machined pipe.

Claims (1)

237010 Erfy f- fl c junqsanspruch For punching slotted holes in steel tubes whose longitudinal sides are parallel to the tube axis and where no female die is used in the tube, characterized by a vertically split receptacle (2) for the tube (1) with half ellipsoidal half shells (3) " , which by means of a clamping element (4) against the pipe to be machined (1) can be pressed and at the main vertex (S ₁ ) have a cutout (5) which corresponds overall to the shape and dimensions of the punch (6), which in a known manner is fastened in the press and is guided through the cut-out (5) and on one side of the cutting surface (7) is preferably 10 ground For this 3 pages drawings