DE1942681A1 - Process for the production of cast blocks, in particular hollow blocks, and mold to carry out this process - Google Patents

Description

Patent attorneys

ZELLENTii J AND LUYKEN
8000 Munich 22

Boris D. Chachalin, 'August 21, 1969

Anatolij M. Gora, Vf a

Jurij S. Ozimin, ρ 25 451/2

Dnepropetrovsk / USSR

PROCESS FOR PRODUCTION OF CAST BLOCKS, IN PARTICULAR OF HOHLBIÖCKEN, AND KOKILLE TO CARRY OUT THIS PROCEDURE

The invention relates to the field of metallurgy, more precisely to processes for the continuous production of ingots, in particular hollow blocks, and on molds for carrying out this process.

There are processes for the continuous production of blocks known by pouring liquid metal into a mold with cooled walls (see E. Gerraan's book "Continuous GuB ", USSR, Metallurg! Sdat, 1961, p.290).

At the moment, hollow blocks or tubes are produced from metals, for example from gray pig iron, with a relatively high expansion preceding the shrinkage and a small shrinkage value.But even with the semi-continuous casting of gray pig iron, detaching the block at the beginning of the casting is very difficult, because : .. Degree and area of contact of the block with

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the Hern are particularly large · This is de Lletalls * in the mold before starting the extraction of the product conditional. For the same reason, it is difficult to squeeze the core out of the solidified block.

However, these processes do not allow hollow blocks made of steel or other metals and alloys to be produced continuously or semi-continuous processes. He. .-K ^ annoying This is due to the shrinkage properties of metals and alloys, which at the moment of formation of a Blocks of steel, for example, came to light. As a result, the block tensions the core, which is intended to form its cavity is, one, and cracks appear on the block, which can even lead to the block being torn off »

In addition, the known processes do not guarantee civs-re Cc ^ _in d & productivity. When casting products from .grauem pig iron during the solidification period, a gas gap is formed between the inner surface of the block and the surface of the core as a result of the expansion that occurred before the shrinkage. Then a. Gap between the cooling surface of the mold and the ingot, which is particularly the case when solidifying metals and alloys that have a high degree of shrinkage. Here, the gap go during the formation the cooling intensity and the rate of solidification of the block to a significant extent back · All this reduces the speed of Blockausziehens and consequently the Leistungsfähigleit the plant for casting metal he certificates ·

The known processes and the molds for their passage

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leadership do not allow the contact surface of the Elock to change with the cooling surfaces of the mold during casting.

The purpose of the present invention is elimination the mentioned IT eight hurry.

The invention is based on the object of a method for the continuous production of ingots, in particular von Iiohlblöcken. and a mold for carrying out this process to create what increase in performance, - Improvement of the quality of the manufactured products, especially steel pipes, as well as reduction of metal consumption.

This problem is solved by a method for the continuous production of ingots, in particular of hollow blocks, while pouring the liquid metal into a mold with cooling walls, in which according to the invention during the formation of the block with the mold walls in contact with it elastic deformations are given transversely to the longitudinal axis of the mold

During the continuous production of hollow blocks it is useful according to the invention, the elastic deformations transversely to the longitudinal axis of the mold by the successive exertion ^of compressive and tensile forces, which

from are directed along the walls, or / bite forces, which are directed transversely to the / walls, to be carried out in such a way that ^: the walls of the core and the mold are pressed one after the other against the inner and outer walls of the block.

The mold for carrying out the process mentioned, which contains cooling walls, according to the invention has a plate with openings for the passage of the metal, which is with a drive and the WJW & ep. ^ gtyaaclen and for transmission

the successive compressive and tensile forces from the drive the front ends serve in the longitudinal direction, with the walls moving freely within the limits of the elastic deformation of their material can.

In the mold for forming the cabbage blocks, the. intended for the formation of the block cavity walls fastened with their upper part suitably to the plate, which is connected to the upper part of .dienenden to shape the outer surface of the block _walls} while <frit its lower Tei ^ tfl ^ former walls * "^ (soil attached v / earth, which is connected to the drive in such a way that when the first-mentioned walls are compressed, the second-mentioned walls are expanded, and when the first-mentioned walls are expanded, the second-mentioned ones are compressed.

In the mold, the. . to form the block cavity certain core wall with its upper part on the Be attached to the upper part of the wall serving to form the outer surface of the block, while the wall of the core is attached to the ground with its lower part can be, on which a support sleeve is set up with sector levers, these levers radially at a tfinkel to Are arranged longitudinal axis of the mold and with one of its ends the wall of the core under the action of the drive on the others Spread the lever ends.

To explain the invention are carried out below examples of the method and embodiments of the mold with Reference is made to the accompanying drawings; it shows;

Pig.l the mold for the formation of full blocks, longitudinal section;

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Fig. 2 the mold for the formation of hollow blocks, lä cutj

3 shows the core of the mold for forming the Elock cavity,

Example 1·

The mold for the continuous production of full blocks has a housing 1 (Fig.J), on the upper part of the Drive, in this case a hydraulic cylinder 2 is attached. Inside the housing 1 there is a wall 3 which is intended for forming the block.

Between the wall 3 and the housing 1 there is a bar 4, which is provided with an inlet connection 5 for the inlet line the coolant (water) and a drain port 6 for the discharge of the waste water is in communication.

The lower part of the wall 3 is secured by means of bolts 7 attached to the housing 1 of the mold, lies with its upper part on the housing by means of a packing gland 8 and is connected to a plate 9 by the bolts 7.

In the upper part of the mold housing 1 and in the plate 9 there are corresponding openings 10 and 11 through which the metal enters the mold. The piston rod of the hydraulic cylinder 2 is rigidly connected to the plate 9 and is used to transmit tensile and compressive forces on the wall 3.

The mold for carrying out the process according to the invention works as follows

Before the start of the process, the lower part of the mold is placed; which is limited by the wall 3, introduced the Kaitatrang ( not shown in the drawing). Then you pour through the openings 10 and 11 into the mold .. liquid metal,

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In the given trap, pig iron. In room 4, the Additional connection 5. / Water in and drained off via the drain connection 6, so that it is the connection 3 and the metal resting on it 'ablriiüLlt. It sets the solidification of that which forms the block Lie tails, which go from the cooled surface to the li tte / des Blocks runs. «This is done at the same time as the Shrinkage preceding expansion and the shrinkage of the ingot metal, during the shrinkage, the dimensions decrease of the block to be formed and the surface loosens from V / andung 3 of the mold

In order to prevent the solidification rate (because of the reduction in thermal conductivity) of the block from decreasing as a result of the reduction in the contact between the wall 3 and the block, the drive is switched on. The piston rod 12 goes down together with the plate 9 and transfers pressure forces to the wall 3 in the area of the elastic deformation of the material. This ensures that the wall 3 comes into contact with the surface of the cooled block .

Then, the direction of the piston stroke is changed and the piston rod 12 transmits traction * he üb the plate 9 3 on the wall In the stress of the wall 3 to train it disengages from the block surface from · the same time, the block is withdrawn · The cycle of the pressure - and tensile deformation of the wall 3 is repeated

- * As a result, the block can easily be pulled out and

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<° freezes faster. Since the cross-sectional dimension of the wall 3 in

JJ Range of elastic deformation of your material changes

_ »Be is. the cross section - the wall 5 after

<o Cessation of attacking forces unchanged.

Example 2 The mold for continuous production voa

Ilohl'olö'cken (in the given example of steel pipes) possesses a housing 13 (i? ig.2), on the upper part of which the drive - For example, a hydraulic cylinder 14.-is attached. A wall 15 is housed within the housing 13,

which is intended for the design of the outer surface of the block is attached. The upper part of the wall 15 »lies in the cj: i housing is and in the lower rope by means of bolts 16 on the housing "'means a packing gland and is on a plate 17 with Using the bolts 18 attached. Between the housing 13 and the landing 15 is provided with a seam 19, which is made by means of a socket 20 and 21 is connected to the water supply network. There is a Vandxing in the mold to form the block cavity (A core) 22, the upper part of which is attached to the plate 17 and the lower part of which is attached to the conical bottom 23, which connected to the piston rod of the hydraulic cylinder 14 is. For supplying the coolant (the ϊ / water) to the Space of the wall 22 is an inflow clip 25 and for the discharge the same a drainage paws 26 is provided. In the top of the housing 13 and in the plate 17 are corresponding openings 27 and 28 for the supply of the liquid metal into the mold executed.

The mold used to carry out the process works as follows;

Before the start of the process, a cold strand (not shown in the drawing) is introduced into the lower mold part, which is intended for the formation of a hollow block. The water cooling the mold walls 15 and 22 is fed through the nozzles 20 and 25. The liquid steel is poured through the openings 27 and 28 into the. by the walls 15 and 22 a space · occurs when the steel cools down. a two-

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lateral solidification. that of the cooled outside and the cooled inner surface runs towards the center of the block. Of the

themselves
The block shrinks, detaching it from the wall 15 which is outer for it; and bridged to the inner wall 22. The drive is switched on so that the block is not pressed too tightly against the wall 22 (since difficulties may arise when pulling the block out) and / not detached too far from the wall 15 (because the effectiveness of the block cooling is then reduced). The piston rod 24 goes downwards and exerts a tensile force on the wall 22 and the wall 15. Druckkraftimber the plate 17 ^ from. Here, the cross-sectional dimensions of the walls change within the limits of the elastic deformation of their material.

This makes contact of the wall 15 with the outer surface of the 'block and the required intensity of its

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Cooling as well as the Kontaktider Wandung 22 with the inner surface of the block and the required intensity of its cooling on this side are maintained. However, the block is not pressed strongly against the walls, so it can be pulled out freely.

Then, to change the direction of the Kolbenshubs, and the piston rod, the upward going transmits "-... Pressure forces on the wall 22 and tension forces on the plate 17 to the wall 15 sieve repeat Furthermore / the described deformation of the walls Consequently solidifies the Block faster and easier to pull out.

On the cooling walls 15 and 22 tensile and compressive forces are successively as in the first example within the limits

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elastic deformation applied, which is why after stopping the cross-sectional dimensions of the walls are restored under the load will.

Example 3 »

The mold for the continuous production of cabbage curls is substantially similar to that described in Example 2.

It also has a drive in the form of a Hydraulic cylinder 29 (Fig. 3) which is attached to a plate 30 which is rigidly connected to the wall 31 (the core), which in turn is connected to the floor 32. A sleeve 33 with levers 34 is attached to the floor. -

The wall 31 is cooled with water, which is supplied through the inflow connection 35 and discharged through the outflow connection 36. On the piston rod of the hydraulic cylinder 29 there is a part 38 which _r cooperates with the one ends of the radially arranged lever 34, while the other ends of these levers push against the wall of the 31st

The mold for carrying out the process works as follows.

When the drive is switched on and the piston rod 37 of the hydraulic cylinder moves downwards, the part 38 on the upper arm of the lever 34 -an; _., Which is arranged radially and below an angle to the vertical axis of the piston rod 37 presses simultaneously the lower arm of each lever against the wall 31 and bends, whereby the cross-sectional dimension of the core increases in the predetermined thickness . When the piston rod 37 retreats, the load on the wall 31 from one hand ceases and takes its original Dimensions on · Just as in the previous

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The following example will be forces within the limits of the elastic Deformation of the wall created

The tests showed that the hollow block lighter from the Core comes off and has a good surface · Thanks to the improvement the quality of the hollow products (avoidance of cracks) made it possible to use less metal for their manufacture to spend »

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Claims (1)

August 21, 1969 Patrverwa-to Vf a ZELLFr ¹ T !! '·. UJVKEN ° ^ ⁷ ^ MCl. M. ". C ^. en 22 ^ 1 PATENT CLAIMS " 1. Process for the continuous production of cast iron blocks, especially from Hoiblo eic en by pouring in the liquid details in a mold with cooling walls, characterized in that during the formation of the block elastic deformations transverse to the longitudinal axis of the mold are given to those in contact with the mold. 2. Process for the continuous production of liohlblocks according to claim 1, characterized in that the walls ·. · Elastic. Deformations by successive application of compressive and tensile forces from th, which are directed along the walls, or / bending forces, which are directed across the walls, so i. granted are »that the walls of the core and the mold one after the other to the inner or. pressed against the outer walls of the block will, . 3 Mold for carrying out the method according to Claim 1, which contains cooling walls, characterized in that that si-e a plate (9) with openings (11) for Has passage of the metal, which is connected to a drive and the cooling wall (3) / for the transmission of successive Compressive and tensile forces from the drive to the wall (3) are used in the longitudinal direction, the wall (3) being within the limits of the elastic deformation of their Yferkstoffs moves,. 4 · Mold according to claim 3 for carrying out the method according to claims 1 and 2, the cooling walls, underneath 109810/1091 also intended for the formation of the BiocMiolil space Contains walls, characterized en that the wall serving to form the block cavity (22) is attached with its upper part to a plate (17) which is connected to the upper part of the Y / andung (15) serving to form the outer surface of the block, the first-mentioned wall (22) with its lower part is connected to a base (23) which is connected to the drive (H) in such a way that when the first-mentioned wall (22) is compressed, the second-mentioned wall (15). ^ is stretched, while ¹ when the first-mentioned is stretched, the compression of the The second mentioned takes place 5. Chill mold according to claim 3 for carrying out the method according to claim 2, which contains cooling walls, including also intended for the formation of the block cavity. , characterized in that the wall (31) serving to form the block cavity with its upper part on a plate (30) and its lower part one
reu part is attached to / bottom (32) on which a support sleeve with sector levers (34) is attached, these levers being arranged radially and at an angle to the longitudinal axis of the mold and one end of the wall (31) under the action of the Spread the drive (29) on the other ends of the levers (34). 10981071091 ßAD ORiGfNAL Blank page