DE364837C - Casting process for the production of void-free blocks - Google Patents

Description

Casting process for the production of void-free blocks. The invention relates to a process that can also be used in mass production and enables blowholes and segregation in cast ingots of fluoro iron, steel, metal, etc. almost or also to be avoided entirely by putting on each cast block at the correct time interval Another block is poured on as a head and later fully separated from it, so that no loss can result from lost heads. Accordingly, with two 'superimposed Block forms and intermediate form in between worked, which. for the sake of Separation. Of the two contiguous blocks can be removed.

Block casting process, in which with two block molds standing on top of one another work is being done have already become known; also with this casting process are cross-section reductions between the stacked ones by means of inserts Blocks for easy separation; caused by the blocks. These deposit are can also be removed from the outside. In the case of the known casting process, however, there is neither a reduction or the elimination of brokering and segregation was intended or achieved but it should only be easy to divide the cast-together blocks will. This is why the block shapes that are placed one on top of the other are continuously Operation without sub-techun2 filled with the liquid material.

With the casting method on which the invention is based, however, As far as possible Junker and segregation-free blocks are achieved, it will therefore be like this worked that one too. next fills the lower block mold, then an intermediate mold and on it a second block form is placed and only then the Zwi. form and the second block form fills if the contents of the lower block form already has solidified, so that the contents of the upper block form as the pouring head of the lower block works and prevents the formation of cavities and segregation in the lower block. After removal In the intermediate form, the lower block is then partially still liquid from the upper block separated. The upper block shape with content is now set down, an intermediate shape and placed on top of this a block shape. Is the content of the lower block shape far enough, d-. H. solidified up to about a third or half, so will the intermediate form and the upper block form fully poured, so that its content again acts as a pouring head for the lower block. This game is repeated over and over. By Switching on the intermediate form is a cross-sectional constriction between the both blocks achieved for the sake of easier separation: but one could also use it refrain, without the \ Virkung of the casting process, namely the reduction or also complete elimination of shrinkage and segregation. Here is So the filling of the two stacked block molds in two steps and at the correct time interval, the separation of the lower solidified from the upper still partially liquid block. and <read the pouring of a new block on these the main thing, so that the following block always has the pouring head never preceding it forms: the cross-section constriction between the block genes by using the intermediate form is desirable, but not absolutely necessary, so a minor matter.

In order to be able to empty the ladle quickly enough, if there is should appear necessary, several blocks at the same time, e.g. B. by means of over the ladle attached tub with several outlets, cast.

In the drawings, the invention is shown in the form of an exemplary embodiment. Fig. I, 2, 3, .I, 6, i and 8 show the individual work steps in vertical longitudinal sections. Fig. 5 shows the block, which is produced at the beginning of the work process or after interruptions in the work process while Fig. g shows the block as it is continuously produced during the casting process. Fig. 10 shows the base plate in plan view, Fig. Ii shows the open intermediate form without lining, Fig. 1z shows the closed, lined, ready-to-use intermediate form in plan view. On the drawings: a the documents,. b the base plates, c the block forms, d the armor of the intermediate form, e the connecting links of the armor d, f the fireclay or similar lining of the intermediate form, g the detachable ring bolts for cl and r: d, e, f and g together form the intermediate form, which is placed between two block forms c, lt the liquid content of the hlockfortn, i the solidified, but still warm, z. B. incandescent content: put block form, 1, # the scraping device for separating two connected blocks, 1 one, as it is generated at the beginning of the work process or after interruptions of the process, while in a block, as it is in the casting process results.

The process of casting is initiated in such a way that a base plate b is placed on a base plate with a central opening that is movable or fixed by means of a carriage, turntable or the like, and a block shape (mold) c is placed on it, which is filled in the usual way with the liquid material h (Fig. i). On the block form c one then brings an intermediate form consisting of the armor pieces d, the connecting links e, the detachable bolts g and the fireclay or similar lining f, the clear cross-section of which is smaller than the small clear cross-section of the block form c (Fig. 2). -Now a second block form c is placed on the intermediate form. In the meantime, the lowest part i of the contents of the lower block form has solidified, as shown in Fig. 3. In this state of the contents of the block form, the cavities and segregations begin to form. The upper block form -his is now filled to the usual height, ie almost to the upper edge, with liquid material 1a from the pouring ladle. Shrinkage cavities will then no longer be able to form at all in the block located in the lower block form. apart from the smallest marginal voids, perhaps. because the liquid material h located in the intermediate mold and in the upper block mold immediately pushes in, a process that is particularly promoted by the high column of the liquid material h located in the block molds in addition to the intermediate mold. For the same reason, segregations are prevented or at least limited to a minimum: @ iaß.

The lining f of the intermediate form e, d, g is made of chamotte or the like, a bad conductor of heat: with proper use it prevents its light Cross-section (allows premature cooling of the contents of the intermediate form and secures in association with the chosen form {leg block forms the correct progression of the Solidification of the content of the two block forms together with the intermediate form in a steady manner from bottom to top, so that there is always access to the bottom for liquid goods open and its constant connection Young with the frozen good i stays secured.

If the solidification has progressed beyond the intermediate form, as shown in Fig. 4, the lower block must be separated from the upper one. One can easily see from the outside whether this point in time has been reached, "- one close the upper block form with everything what is attached to it lifts something by means of a crane. If there is a gap between the upper block form and the intermediate form, it is too early; if. not, then one can proceed to separation. This happens. by using the intermediate form e, d. g opens a few bolts g by pulling out a few bolts g (Fig the upper, largely still liquid, is quickly separated by rotating the workpiece through: the crane around its own axis (Fig. q.). The lower block fore c with its content falls: on a block handle, which expresses the block L (Fig. 5). This block is smooth at the lower, thin end and with a recessed head at the upper, thick end. 'Such blocks arise for me at the beginning of or when the work is interrupted. If the lower block form separates from the lower block when it is removed from the casting site, it is grinded over a block box, into which it falls and can now be picked up by the deep furnace crane. The upper block shape c with its mostly still liquid content hangs in the crane after the lower block has been ground off and is placed by the crane on a base a: with a central opening into which the drawn-in lower head of the The block form, which is in the block form, is largely still liquid, and the block form is now again: the intermediate form d, e, g with lining f and the second block form is placed on top of it. 'The block is now left to stand until it solidifies has progressed so far from bottom to top that voids and segregations begin to form and then fills the intermediate molds and the upper block mold with liquid material h (Qbb. 6 and 7) , - # as described above The result is a block in with retracted heads at the upper and lower end according to Fig r the suitable lifting and moving devices and the other devices for separating, pressing and setting down the blocks, for setting down and cooling the block molds, etc. are taken care of.

A block of square () animal section is assumed above; but of course you can also use blocks of rectangular, round or a otherwise required cross-section can be cast. Can also be used in place of the one shown Block shapes that are narrow at the bottom and wide at the top are used that extend downwards expand, and the intermediate form can be carried out differently than indicated above be e.g. B. without lining, so only made of cast iron, cast steel or the like. or in several parts, with or without tapering their clear cross-section. It exists .then the possibility of also blocks with a lower thick end, as well as blocks that go through the intermediate piece at the thick or thin end with or without constriction or which by a conical intermediate knit without constriction with a patch and a thin end, just as required when practicing the casting process could be.

Separation of the connected blocks can be done, except by scraping by means of air pressure chisels, also by sawing, shearing or pinching.

Finally, in special cases, in order to save the intermediate form, be worked in such a way that the block shapes with the thick or the thin ends placed directly on top of each other. Blocks will then fall, alternating with the thick and the thin end are related.

Claims (1)

PATENT CLAIM Casting method for the production of void-free blocks in "continuous operation, characterized in that a subsequent block is cast as a casting head on a first cast, partially solidified block, which then, serving as a basic block, is provided with a casting head by casting a new block, so that in any length of continuation of this process only blocks are produced in which the formation of cavities and segregation were prevented by the pouring head effect of the subsequently poured block.