DE687338C - Process for the production of centrifugally cast socket shells - Google Patents

Description

Process for the production of centrifugal casting socket molds For production centrifugal casting socket molds made from solid blocks were essentially known up to now two procedures. One method turned the cylinder into a cylindrical or prismatic one or slightly conical or pyramid-shaped cast ingots, the mold is machined the excess material worked out immediately; these are however cast ingots of very large dimensions, in particular large lengths, are required, and furthermore, the one to be removed by machining, in particular on the long shaft part The amount of material is relatively large, making this process cumbersome and expensive is. In the other process, the one corresponding to the mold was slightly conical or pyramidal cast ingots äusgeschforged in such a way that one end of this Block, which later formed the thickened socket end of the mold, on relatively short axial length was forged less strongly, while the subsequent longer part of the block, which later form the long shaft part of the mold should, was forged relatively strong to the smaller diameter as the only visibly forged through, the later socket shape of the socket mold forming end part of the ingot. In the pre-forged workpiece, which thus had a thickened end due to the different degrees of forging, the continuous shaft bore was then incorporated, and after that. subsequent remuneration the extended socket bore was prepared as well as the finishing of this enlarged socket bore and the finishing of the shaft bore and furthermore if necessary, the outer overturning of the workpiece is carried out.

This latter procedure has so far been used almost without exception Manufacture of centrifugal casting socket molds for the production of centrifugal casting socket pipes serve and which have also proven themselves quite well in practice. Practice showed but also. that the wear and tear of the centrifugal casting socket molds produced in this way almost without exception on the socket part, especially on the transition part between the socket and shaft begins. and that the wear and tear that occurs here already makes it unusable the mold causes when the remaining long shaft part of the mold is still relatively is good and hardly shows any significant wear. Since now already smaller Cracks in the inner surface: the mold, the quality of the centrifugal cast products is essential can affect, the invention relates to such a method for Manufacture of centrifugal casting socket molds, through which it is guaranteed, that the wear also in the socket part of the molds and in the transition part between Socket and shaft first then begins to occur, albeit with wear and tear starts in the long shaft part. This increases the lifespan of the centrifugal casting socket molds extended and the production costs of the centrifugally cast pipes, -an ,; which the mold costs have a substantial share.

First in the socket part and in the transition part between socket and shaft the onset of mold wear is due to other causes, such as tensions occurring during remuneration as well as various occurring during operation Stresses due to different levels of cooling and different sizes of the liquid iron located at the respective points, essentially also on it, that in the above-described type of production of the centrifugal casting socket molds the socket end of the molds does not experience the same degree of forging as that Shaft end.

In order to remedy this in the most effective way possible, is proposed according to the invention, centrifugal casting socket molds by dowelling a full pre-workpiece with approximately the same cross-section over its entire length (cast or pre-forged block) and working in the hole and the preliminary workpiece in this manner into the outer socket mold form following the flaring to forge out or to press that. The spiked end is essentially the same The degree of forging experiences the same as the non-spiked full shaft part. This takes place preferably the flaring of one end of the pre-workpiece onto one of the clearances of the socket part of the finished socket mold approximately the same size, whichever is greater is than the diameter of the shank penetrating, later to be incorporated, the clearance of the shaft part of the finished mold approximately corresponding hole.

In the manufacture of axle sleeves, it is already known that the sleeve-like manner extended end by expanding and at the same time upsetting the end of a full one To form a block and then to drill out the workpiece prepared in this way. With this one known methods, however, it is only a question of the thickened part to produce a hollow body in the simplest and most economical way possible; after the production of the socket and the subsequent drilling No further forging work is carried out on the axle box body.

In contrast to this, there is the per se known single-ended torch NEN of the full preliminary workpiece in the invention exclusively for the purpose of To be able to forge the workpiece in such a way that the socket end of the The ingot mold is forged to the same extent as the shank part of the ingot mold.

-'_ ° :. With the new procedure, in addition, in all of them Parts of the finished socket mold to obtain a uniform material structure, is in a further embodiment of the invention, the flaring of one end of the preliminary workpiece, the forging and the bore penetrating the shaft part are dimensioned in such a way that that the intermediate piece prepared in this way for carrying out the remuneration process according to an older proposal has approximately the same wall thickness everywhere, so that when Tempering process no material stresses arise from material accumulations can.

The individual work processes are used to explain the new procedure shown in the drawing.

The pre-forged one, which has approximately the same cross-section over its entire length full preliminary workpiece i is shown in thick solid lines. Using the The dotted line mandrel 2 is .das one end of this preliminary workpiece i in such a way aufgedornt that it assumes the form 3 also drawn in dashed lines. Afterward then the final forging takes place, through which the workpiece is more evenly Forging through of the socket and shaft part into the one shown in dash-dotted lines Form .4 is transferred. After removing the mandrel, the puncture is now carried out drawn through shaft bore 5 and the transition part adjoining this incorporated into the socket cavity, so that the hatched socket mold shape 6 is created. This is followed by final processing, if necessary after the remuneration has been switched on by external over-turning and internal post-processing.

Claims (1)

PATENT CLAIMS: i. Process for the production of centrifugally cast socket shells by expanding a cross section that is approximately the same over its entire length owning full pre-work piece and incorporation of the hole, characterized, that the preliminary workpiece following the mandrel, which is preferably on one of the Light vest of the socket part of the finished socket mold with the appropriate diameter takes place in such a way. is forged or pressed into the outer socket mold, that the thorn end has essentially the same degree of forging learns like the non-spiked full shaft part. a. Method according to claim i, characterized characterized in that the thorn de: one end of the preliminary workpiece, the Ausschtniedung and the bore penetrating the shaft part are dimensioned in such a way that so prepared intermediate workpiece has approximately the same wall thickness everywhere, so that when Tempering process no material stresses arise from material accumulations can.