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Salzgitter Antriebstechnik Gmbh & Co. Kg

Furchheim, Bodo

Bodo Furchheim

Franz-Josef Schleifstein

A method for the linking of components to hollow shafts, preferably for producing camshafts, is disclosed where the components, especially cam rings, are manufactured so as to generate their function-related contour, that either a hardenable material is used for this purpose which, aside from its elastic deformability, after hardening still has a permissible plastic deformability of minor extent; or that subsequently the surface of the components, particularly the contact face of the cams, is subjected to a surface-hardening process. These components together with the hollow shaft to be deformed are placed into an IHPF tool in a manner to suit the respective function, and that in a second process step through the application of the IHPF process and due to the internal pressure exerted the components are joined to the hollow shaft in a force- and form-closing manner.

Method for linking elements to hollow shafts, preferably for producing camshafts, and resulting camshaft

The invention concerns a method whereby components are arranged in a mounting device, outside an internal high-pressure forming press, in accordance with their position and their function, such that they are linked to one another. The mounting device comprises an upper part and a lower part including cavities identical to the cavities of the internal high pressure tool. Once the components have been installed, the mounting device is introduced in the internal high-pressure press, then the upper part or the lower part of the mounting device is withdrawn, the part of the mounting device remaining in the internal high-pressure press being displaced against the upper tool or the lower tool. For the forming process, the components are maintained in a part of the tool by depression or by clamping, then the part of the mounting device is removed from the internal high-pressure press, thereby ensuring high precision positioning of components. Additionally, the production rate is substantially increased. The invention is particularly applicable for the production of cam shafts.

Method for feeding hydroforming presses, and device for carrying out the method

Method of hydroforming a workpiece

A Method for the linking of cam rings to hollow shafts. In a first process step, the cam rings are manufactured, so as to generate their function-related contour, from two individual rings of different material connected to each other in a force-and form-closing manner, with the material of the outer ring being hard and elastic and having a permissible residual expansion of at least%, and that of the inner ring being soft and plastically deformable. The cam rings together with the hollow shaft to be deformed are placed into an internal high pressure forming tool in a manner to suit the respective function. In a second process step through the application of an internal high pressure forming process and, due to the internal pressure exerted the cam rings are joined to the hollow shaft in a force-and form-closing manner. In a particular embodiment, the cam rings consist of two rings joined with each other in a force-and-form-closing manner with the inner ring being made of soft, plastically deformable material and the outer ring being made of a hard, elastic material.

Method for linking element to hollow shafts, preferably for producing camshafts, and resulting camshaft

Hollow shafts, and particularly camshafts, are produced using an internal high-pressure forming (IHF) process. Cams and/or machine elements are mounted at intervals onto the outer surface of the hollow shaft, depending on the use of the latter, by a non-positive and/or positive fit, in a position appropriate to their function when the hollow shaft is placed in the forming tool. An element with approximately the same external diameter as the internal diameter of the hollow shaft is placed in at least one of the hollow shaft, and the hollow shaft together with the cams and/or machine elements that have been pushed onto the same and the inserted element are placed in an IHF tool. Once the IHF tool is closed, the medium is caused to act under the required high-pressure in the hollow shaft. At the same time as the medium is acting internally, at least one ram is pressed axially against at least one front face of the hollow shaft. Thus, filling the IHF mould with a material flow induced by the pressure effect of the medium and the mechanical pressure of the ram. The element is thus enclosed by the material of the hollow shaft and the cams and/or elements are connected to the hollow shaft by the non-positive and/or positive fit by means of the expansion of the hollow shaft. The end of the hollow shaft sealed by the element is mechanically machined to suit functional requirements.

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Chemnitz, Germany

Bodo Furchheim