DE2261281A1 - METHOD AND DEVICE FOR BURL-FREE SEPARATION OF PARTS, IN PARTICULAR WIRE OR ROD MATERIAL - Google Patents

Description

"Method and device for burr-free separation of parts, in particular of wire or rod material "The invention relates to a method for burr-free cutting of parts, especially wire or bar material, which is clamped in the area of the separation point, as well as on a device for implementation this procedure.

The separation of parts in general, such as the separation of bar or wire material or the severing of slugs or the like. Is either through a cutting process or machining is carried out. Disadvantageous is in the cutting process that a cutting burr remains, which by a costly overcasting can be eliminated. It also results in the cutting process quite a considerable amount of tool wear. Even when cutting by cutting cutting burrs and significant material and machine costs. In the case of large series, the costs for reworking to remove the cutting burrs add up, tool wear and machine costs increase quite considerably.

It is the object of the invention to provide a method for separating parts to create which is less wage and machine intensive.

In a method, the task at hand is that mentioned at the beginning Art solved in that, according to the invention, the material by twisting shearing is separated.

There are no additional tool or material costs when shearing; Likewise, there are no costs for reworking, since there are no cutting burrs gives.

The angle of twist of the material on either side of the separation point is preferred Chosen to be larger than the breaking angle, because it can smoothen the breaking point is.

The one used to carry out the method according to the invention Device in which the parts to be processed of the material to be separated is set in clamping pieces, is characterized in that at least one the clamping pieces that grip the part directly on both sides of the separation point, is rotatable around the separating center line when separating. It is sufficient for one of these Device full when one of the clamping pieces around the center line of the wire or Bar material is rotatable and shears off the material when it is rotated during cutting.

According to a further embodiment of the invention, the distance is the Clamping pieces smaller than the diameter of the wire material to be cut. With attention These dimensions result in extremely clean shear surfaces, which need no further post-processing.

The invention is based on the exemplary embodiment shown in the drawing explained in more detail.

A wire 1 to be cut is finished in two axially to the wire 1 Collets 2 set. The collets 2 have a mutual Distance that is very small, but at least less than the diameter of the Wire 1. While the right collet is fixed in place, the left collet can revolve around the center line 7 of the wire in the direction of an indicated arrow 8th.

The collets 2 are arranged in clamping cones 3, which in turn are displaceable on abutments 4. The collets are tightened using a union nut 5 which is pulled over the clamping cone 5.

Now move the left collet in the direction of arrow 8 or in the opposite direction put into circulation, then the piece of wire 1 is sheared off in the area of the gap 6, with a burr-free, rotationally symmetrical separating surface on the two wire ends arises. The required angle of rotation of the left collet 2 is of the type of depending on the material to be separated. The angle of rotation will be the smaller, the more brittle is the material of the wire to be cut; it is selected larger than the break angle, since this allows better smoothing of the break point. When the device is also particularly suitable for separating brittle materials, but that's how it is not limited to brittle material or even just to metallic materials.

It can be used wherever wire or rod material is present should be separated at a certain point.

After opening the collets 2 this without changing the gap width occurs, the sheared-off piece of wire is sheared by pushing in the wire material Auscjhoben to the left, which can then be followed by a further separation process.

A specific application example for the method and the device One aspect of the invention is cutting tungsten wires for the incandescent or tube production as well as for roller bearings or the separation of plastic parts, such as cutting off slugs from fittings.

Patent claims:

Claims (4)

Claims: 0 method for burr-free separation of parts, in particular for cutting wire or rod material, which is in the area of the cutting point is clamped, characterized in that the material is sheared in a twisting manner is separated. 2. The method according to claim 1, characterized in that the angle of rotation of the material on both sides of the separation point is greater than the break angle. 3. Device for performing the method according to the claims 1 and 2, in which the parts to be machined of the material to be cut in clamping pieces are fixed, characterized in that at least one of the clamping pieces (2), which grasp the part (1) directly on both sides of the separation point (6) when separating is rotatable about the separating center line (7). 4. Apparatus according to claim 3, characterized in that the distance the clamping piece (2) is smaller than the diameter of the material to be cut (1). Blank page e e r s e i t e '