DE1783170A1 - PROCESS FOR CONTINUOUSLY MANUFACTURING A METALLIC STRAND AND DEVICE FOR CARRYING OUT THE PROCESS - Google Patents

Description

SOUTHWIRE COIiPANY
CARROLLTON , Georgia USA

Our reference: S 2755

Process for the continuous production of a metallic strand and device for implementation of the procedure (elimination from patent application P 14 52 019.5-24)

The invention "relates to a process for continuous Production of a metallic strand with oxide-free, bare surface using a continuous casting machine with a casting device and a downstream hot forming device and a device for carrying out the process.

In a method of manufacturing and hot forming a Strand, it is desirable that oxide layers that are on the Metal forming before it is thermoformed must be removed and. that the formation of oxide layers on the strand during its warming is prevented. At the same time is it is desirable that the temperature of the strand during the Hot deformation is reduced.

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If oxide layers are still present on its surface during the hot deformation of the metal strand, then these layers are pressed into the strand, so that its strength, its deformability and its Conductivity will be impaired. Also .e.give Oxide layers on the thermoformed metal strand an unsightly gray-brown. Surface. The ones in the metal strand surface Pressed-in oxide layers can damage wire drawing devices, for example lead if wire is to be made from the metal strand.

Attempts have already been made many times to prevent the formation of To prevent oxide layers on the metal strand after the strand has left the caster. It is, however so far not succeeded in the formation of oxide layers on the metal strand before its hot deformation and also during to completely prevent the hot deformation itself.

The invention is based on the object of providing a method and a device of the type specified at the beginning create, which reduces the oxidation of a metal strand before the hot working and during the hot working can be prevented.

The inventive method for solving this problem consists in the fact that the strand entering the hot forming device after leaving the casting device a lubricant is supplied in the hot forming device, which cools it and its oxidation during the Reduced hot deformation, and that in the hot deformation device during the hot deformation a, non-oxidizing Atmosphere is maintained.

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According to the invention, this method can with a device are carried out, which is designed such that a device for in the hot forming device Delivering a lubricant to the surface of the strand is included, which cools the strand and reduces its oxidation, and that the hot working device is thus completed is that a non-oxidizing atmosphere is maintained in it during operation.

When the method according to the invention is used metal strands, the surface of which is oxide-free. For example, if copper strands using the invention Process, then these copper strands can be drawn into wires particularly well, because the oxide layers that were previously a hindrance are no longer present.

The invention is illustrated by way of example with reference to the drawing explained. Show it:

Fig.1A is a side view of a roller train, '

1B shows a vertical section in the longitudinal direction of the heating chamber of the temperature control oven, which together with: the roller train shown in Fig.iA is used,

Fig, IC is a side view of the receiving member, which together

is used with the roller train and the temperature control furnace according to - Fig.1A and 1B,

Fig _. 1D: a longitudinal section of the cooling member,

Figure 2 is a front view of the roller train from line 2-2 seen from Fig.1A, ■

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Figure 3 is a front view of the feeding device through which a combustible mixture is fed to the burner located in the heating chamber,

4 shows a cross section through the feed device through which non-flammable coolant is fed to the heating chamber of the temperature control furnace,

Figure 5 is an enlarged partial view of that shown in Figure 1C Aufnähmegliedes and the casting wheel,

6 shows a cross section through the receiving member along the Line 6-6 of Figure 5,

7 shows a circuit diagram of the control system for the control the ambient conditions in the heating chamber of the temperature control furnace,

8 shows a partial side view of the roller train and

Figure 9 is a front view of the roller train from line 9-9 seen from Fig.8.

The embodiment according to the invention has a receiving member 10, a temperature control furnace 11 with a heating chamber; a roller train 12 with a cover 14 and a cooling member 15. A metal strand 16 which is poured into a casting device 18 of known type (Fig. 5 and 6), is immediately after its ejection from the casting device 18 of the receiving member "10 enclosed. If the metal strand 16 moves through the receiving member 10 (FIG. 1C), it is of a controlled surrounding medium enveloped, which is preferably reducing to the oxides, in any case but does not have an oxidizing effect. That way will

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in the receiving member 10 any oxide layer located on the metal strand is removed and / or its formation essentially prevented. From the receiving member. 10 the metal strand 16 runs out into the heating chamber of the Temperature control furnace 11, where he is controlled by a Surrounding medium is heated or cooled, this surrounding medium each located on the metal strand 16 Oxide layer reduced and / or prevented. After leaving the heating chamber, the metal strand 16 is from the roller train 12 added without him in between exposed to the ambient air causing oxidation. In the roller train 12, the metal strand in turn enveloped by a controlled ambient medium, which in turn reduces each oxide layer as well as the Prevents the formation of a new oxide layer while the metal strand is being rolled out into a bar 86. The rod 86 is then cooled in the cooling member 15 by means of a controlled ambient medium below its oxidation temperature, the surrounding medium each Reduced oxide layer and prevents further oxidation of the metal.

The receiving member 10 (Fig.1C) has a stripping chamber 19> a transfer chamber 20 and a flexible connector 21. The stripping chamber 19 is a curved part of essentially square cross-section (Figures 5 and 6). The side walls 24a of the drawing chamber lie a casting wheel 22 of the casting device 18 adjacent and on and above this casting wheel 22. Between the two Side walls 24a extend covers 24, which lead away exactly from the circumference of the casting wheel 22 starting; this forms a channel 25 through which the metal strand 16 can pass when it comes off the casting wheel 22 is withdrawn. A metal band 28 surrounds the casting wheel 22,

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so that a mold is created. In the outer cover a slot 26 is attached so that the metal band is out. the channel 25 can exit through the stripping chamber 19, whereby it is possible, the metal strand 16 of the Pull off the casting wheel 22 and introduce it into the channel 25 of the pulling chamber 19 without the metal strand with it comes into contact with the outside air. The transit point of the metal strip 28 through the slot 26 adjacent seals 29 are arranged, which the outside of the Prevent outside air located in the stripping chamber 19 from entering the duct 25 and the stripping chamber 19. On the lower end of the outer edge of the cover 24, seen in FIG. 5, there is a seal 30 which also serves to keep outside air from duct 25.

The flexible connector 21 is a hollow, accordion-like one Bellows which is attached to the upper free end of the stripping chamber 19 so that it is at his one end with its center line in line with the center line of the stripping chamber 19 and that it at its other end with its center line in line with the center line of the transfer chamber 20 lies. The metal strand 16 can run from the pulling chamber 19 into the transfer chamber 20 via the connecting piece 21 without coming into contact with the outside air prevailing outside the receiving member 10 comes. The connector 21 also makes it possible to move the stripping chamber 19 in relation to a support member 30 " to move in different positions, which happens through the operation of an adjusting cylinder 31, which is attached to the Stripping chamber 19 and attached to the support member 30 "with the transfer chamber 20 left stationary.

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The transfer chamber 20 is a cylindrical hollow member, the center line of which is substantially horizontal lies. The transfer chamber has a metallic side wall 32 to which a circular, metallic end portion 32a is fastened by means of bolts and which on its Insulation inside. 34 has, with which essentially a heat transfer from the metal strand 16 towards the ambient air outside the receiving member 10 is prevented. The metal strand 16 runs from the connecting piece 21 into a channel 35 of the Transfer chamber 20, being through an opening 36 ™ passes through end portion 32a and insulation 34 j here it is taken up by rollers 38 which align the metal strand 16 as it enters the transfer chamber 20. Transport several bearing rollers 39 the metal strand 1.6 through the transfer chamber 20, the metal strand 16 being essentially rectilinear is held. Pinch rollers 40 take up the metal strand 16 at the discharge end 41 of the transfer chamber 20 and align it so that it enters the heating chamber 11 correctly through an opening 42.

In the channel 35 of the transfer chamber 20 is a similar

Inert or reducing medium supplied, the supply takes place via a pipe 44 which connects the channel 35 with a corresponding supply source, not shown connects like a gas generator. A tax and Shut-off element 45 controls the speed at which the inert or reducing medium is introduced into channel 35 will. The inert or reducing medium flows around the metal strand 16 located in the channel 35, whereby the opening 36 in the flexible connecting piece 21, through the connecting piece 21 and through the

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Stripping chamber and eventually flows to the sides of the Casting wheel 22 along out of the stripping chamber 19. In this way, the metal strand 16 is of an inert or Reducing medium enveloped from the point in time in which it leaves the casting device 18, and during he runs through the Aufnähmeglied 10.

The heating chamber of the temperature control arrangement is attached to the discharge end 41 of the transfer chamber 20 (Fig.1B). The center line of the heating chamber is in line with the center line of the transfer chamber 20. The heating chamber 11 has a tubular side wall 46 and circular end plates 48 that on both sides are attached to the side wall 46. A refractory lining 49 covers the inside of the Side wall 46 and the end plates ^ 8, whereby a Damage to the side wall 46 and the end plates 48 is prevented, due to the heat of a direct flame located inside the heating chamber. One in each end plate 48 and opening 42 located in liner 49 creates a passage for the metal strand 16, which in this way from the transfer chamber 20 through a channel which is formed by the refractory lining 49.

That the metal strand 16 is correctly at a uniform temperature when it enters the rolling train 12 is held, it is necessary to the metal strand 16 once Applying heat and cooling it another time. Also, there must be any oxide layer that may be on the metal strand 16 due to the absence or formed despite the receiving member 10 during the passage from the casting device 18 to the heating chamber has to be reduced or removed from the metal strand 16,

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"before it enters the roller train 12.

The heat to reduce the temperature of the metal strand 16 is fed to the heating chamber via a conventional gas burner 52, which is located within the channel 51 of the heating chamber 11 is arranged. The gas burner has a tubular wall 54 'With through openings 55, so that a combustible reducer Gas mixture can penetrate into the channel 51 for combustion. This reducing mixture reduces all of them when it burns the metal block 16 present oxides. A supply line 50 connected to the gas burner 52 and a pump 56 supply the burner 52 with the reducing, combustible mixture. The pump 56 receives the combustible reducing mixture from an allocation device 58 in the manner of a commercially available one Carburetor at a constant air-fuel ratio. The carburetor delivers a constant air-fuel mixture regardless of the gas supply. By controlling the discharge of the pump 56, the amount of mixture that the Burner 52 flows in, and thus the amount of heat generated by the burner 52 can also be controlled. In this way reduces the burning reducing mixture that is supplied to the burner 52 from the feeder 58 when it flows through the heating chamber, Qede on the metal strand 16 Existing oxide layer, so that only the original casting material of the metal strand 16 remains when it passes through the heating chamber has run. ·

A reducing medium, which consists of combustion products, is supplied via a feed line 59 and a multiple line 60 fed to the heating chamber, whereby the heating chamber is able is to cool the metal strand 16 and all on it Remove oxide layers. The reducing medium is in a pre-combustion chamber 61 outside the heating chamber generated and the supply is carried out with a combustible

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Mixture that has such an air-fuel ratio, that the combustion products reduce the oxide layers. This reducing mixture becomes the pre-combustion chamber 61 via a burner 62 of known type having a constant air-fuel ratio. The flammable Reduction mixture is then burned in the pre-combustion chamber, and the products of combustion that are in each . If the case has a reducing effect, a pump 64 is used to make them better known Art is pumped into the heating chamber via the supply line 59. A water jacket 66 lying around the supply line 59 cools the water jacket Combustion products as they flow through feed line 59 to pump 64. An ¥ water pump 68 of a known type creates a controlled water supply for the water jacket 66, and a discharge line 69 lets the water out of the water jacket 66 expire. The control of the flow rate through the burner 62, the pump 64 and the water pump 68 are in the Control system for the heating chamber explained in more detail.

In practice, the reducing medium was created by combustion a low-oxygen mixture of air and natural gas. Of course, other fuels can also be used be used. When producing a reducing medium, the combustion of these rich mixtures is of course under incomplete due to the lack of additional oxygen. With the described procedure and the corresponding setup the additional oxygen is supplied by the oxide of the metal, which is reduced to pure metal, providing the oxygen for complete oxidation.

The control system for the heating chamber (Fig.7) has a Voltage regulator 121, a pressure switch 122 and a temperature limit switch 120. The voltage regulator 121 is connected to a constant voltage source ^, which is a common power voltage, and

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he changes their filing performance in accordance with the Voltage generated by one within the channel 51 in the heating chamber attached thermocouple 122 is generated. Of the Pressure switch 122 actuates the pump motor 64 'when the Voltage drop across a pressure pickup 124 arranged within the channel 51 of the heating chamber accordingly grows big. The temperature limit switch 120, in accordance with the voltage supplied by a thermocouple 125, causes the pump motor 56 ', the burner motor 62', the pump motor 64 'and the motor 68' for the water pump start up or stop these facilities. The thermocouples 123 and 125 are the voltage sources of radiation pyrometers known type and they are arranged so that the temperature of the metal strand 16 at the moment is displayed when it enters the heating chamber. Lies the temperature of the metal strand 16 below a certain, predetermined temperature, the voltage supplied by the thermocouple 125, the pump motor 56 'via the Limit switch 120 actuated. The pump 56 then delivers According to the voltage supplied by the voltage regulator 121, a combustible reducing mixture is sent to the gas burner 52. The fuel supply increases in the opposite direction to the increase in temperature of the metal strand 16. That from the voltage regulator Voltage supplied to 121 is controlled by the voltage supplied by thermocouple 123; lies the If the temperature of the metal strand 16 is above the predetermined temperature, the temperature from the thermocouple 125 is caused supplied voltage the temperature limit switch 120, turn off the pump motor 56. This causes the combustion inside the heating chamber due to the lack of fuel stopped.

If the temperature of the metal strand 16 is above that before set temperature so. actuates the thermocouple 125

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The voltage supplied by the thermocouple 123 controls the speed of the motor 62 'of the burner 62, which delivers a constant air-fuel ratio, via the voltage regulator 121 the burning speed in the burner 62 is controlled, the water pump ^{motor 68 f is} controlled, whereby the water flow through the Viassermantel 66 is controlled and the pump motor 64 * is controlled, whereby the flow rate of the combustion gases from the pre-combustion chamber 6 * 1 into the heating chamber flow, is controlled.

The flow of water through the water jacket 66 cools the combustion gases so much that they cool the metal strand 16 to the predetermined temperature before it reaches the rolling train 12. Therefore, the higher the temperature of the metal strand 16, the higher the water flow that is generated by the water pump 68 in order to cool the metal strand 16 to the predetermined temperature. If the temperature of the metal strand 16 falls below a predetermined temperature, the voltage supplied by the thermocouple 125 switches via the temperature limit switch 120, the motor 62 'for the burner 62, the motor 68 ^f for the water pump and the motor 64' for the pump. If the pumps 56 or 62 fail, the pump motor 64 'is actuated by means of a voltage supplied by the pressure pick-up 124, as a result of which the heating chamber is cleaned of combustible gases which would result in an explosion if they remained in the channel 51.

The heating chamber then heats the metal strand 16 by that a combustible mixture supplied to the channel 50 is burned by the burner 52; this will all around the metal strand 16 generated in the channel 51 a reducing medium for

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In the event that the temperature of the metal strand 16 is below a predetermined temperature ". In addition to this, The oxidation layer on the metal strand is reduced could be present. In addition, the heating chamber supplies the Channel-51 with the cooled gases when the temperature of the Metal strand 16 is above a predetermined temperature. The cooled gases not only cool the metal strand to a predetermined temperature, but it also reduce any oxide layer that might be present on the metal strand. In addition, the heating chamber can also be used to the rolling train 12 an oxide-free metal strand 16 at a predetermined rolling temperature to be transmitted also in the event that no receiving member 10 is present. It just takes a sufficient amount of reducing gases to be fed into the channel 51. However, this requires an uneconomically large amount of fuel, whereby a certain need for the transfer chamber 20 and the receiving member 10 is given.

With the task of removing all burrs from the corners of the metal strand 16, there are several within the heating chamber Trimming burner 131 is provided. The Albgrat burner 131 have several nozzles 132, which through the side wall 46 and the refractory lining 49 of the Helzkammer protrude. The end-? In addition, there are several feed lines 133 for a mixture, which are connected to the nozzles 132, as well as a multiple line 134, which on the supply lines 133 a combustible Mixture distributed, and a control and shut-off element 135 located in the multiple line 134, which controls the inflow of the equipment to the nozzles 132 controls. The nozzles 132 are arranged so that the jet of flame emerging from the nozzles 132 is passed against the corners of the metal strand 16 and the burr burns off.

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Two pinch rollers 70 are inside a metal tube 71 which extends between the end plate 48 and an end wall 72 of the rolling train 12. The pinch rollers 70 take up the metal strand 16 when it enters the heating chamber via the opening 42 located in the end plate 48 leaves, and they lead the metal strand through the passage 74 of the rolling train 12 located in the enclosure wall 72 to. The metal tube 71 serves to prevent any contact of the heated metal rod 16 with that outside the facility Prevent ambient air and it creates a storage for the pinch rollers 70,

The roller train 12 (1A) is of a conventional type and has one Cover 14, whereby a slight medium pressure within the Cover can be applied. The cover 14 v / eist several L-shaped hoods 75, which are located outside of the roll stand 76 of the roller train 12 and across it, and which sit with their ends on the base of an L-shaped transmission housing 78 of the rolling train 12. In addition, the cover has 80 and on the feeder side 12 end walls 72 on the discharge side 81 of the roller train 6. The hoods 75 have at their upper ends, on the top of the transmission housing 78 (Figure 2) hinges 79 as well handles 32B at their lower ends so that each hood 75 can be easily lifted by hand to attach to the roll stands 76 to handle. The hoods 75 are arranged next to one another that between their edges 84 a very small one Slot is present. In this way, the surrounding gases can flow to a small extent inside the cover 14 or flow out of it. The end walls 72 are mounted on the transmission housing 78 so that they with the Hoods 75 are in communication, creating a substantially closed chamber 85 through which the metal strand 16 runs through. The passages 74 in the end walls 72

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enable the metal strand 16 to run into the rolling train, to be rolled in it and out of it as a bar 86 to resign.

Extends along the entire length of the roller train 12 one of the lubrication systems above the roller stands 76 (Fig.iA and 2) and cooling multiple line 88. It is used to the rollers 89 of the roller train 12 and on the metal strand 16 with the help of nozzles 92 a lubricating coolant to be distributed when the metal strand 16 runs through the rolling train 12. The coolant is the multiple line is fed via a pipe 90, to which a control and shut-off element 91 is interposed, which serves to control the flow of coolant through the manifold 88 and the nozzles 92. Due to the evaporation of the coolant, which is given by the heat of the metal strand 16 and the rollers 89, a low pressure is generated within chamber 85. Via a multiple line 94, the several along at a distance has arranged nozzles 95, it is possible, as already described, a reducing mixture at ±) ruek into the chamber to feed. This creates an even greater pressure gradient between the pressure prevailing in chamber 85 and the outside pressure side pressure generated. A supply line 96, which a Control member 98 for controlling the flow rate has, supplies the multiple line 94 with controlled Amounts of the reducing device. That way, no one can Outside air penetrate into the chamber 85 under the hoods 75.

The second embodiment of the roller train shown in Fig.iA 12 has a roller train 12 * (FIGS. 8 and 9), the metal strand 16 coming from the heating chamber 11, is received by a transfer tube 71 *. The metal strand 16 is then rolled out in the usual manner in the rolling train 12 ″, the metal strand 16 between the

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Rolling! Change 76 »is transported further through additional transfer tubes 71 '. A coolant flow is generated from a multiple conduit .88 'for coolant; the multiple line 88 'has a plurality of nozzles 92' along its length and has a supply line 90 'and a control and shut-off element 91'. The coolant flow exiting from the nozzles 92 ^f is so great that it envelops the metal strand 16 when it is rolled, whereby the outside air is prevented from coming into contact with the metal strand 16 during the rolling and from oxidizing it. The heat radiating from the roll bars 76 ′ and ″ the metal strand 1b causes the coolant to oxidize during the rolling of the metal strand, which in turn reduces any oxide layer that might be present on the metal strand 16.

When the rolled bar 86 leaves the rolling train 12, it is received by a cooling tube 99, which has three sections 99a, 99b, 99c, each having a passage 98 'have. The first section 99a is at its one Page over the passage located in the end wall 72 74 in communication with chamber 85; on his other side the section 99a is connected to a catch basin 100. The catch basin 100 is a hollow, rectangular part. which is provided with a drain pipe 101 on its lower side is, whereby all medium that has caught in the catch basin 100 can drain. The second section 99b of the cooling pipe 99 communicates with the catch basin 100 on the side opposite the first section 99a; the connection is such that each in the first section 99a located passage 98 'and in the second section 99b located passage 98 »are in a line. One in the A funnel-shaped inlet leading to the second section 99b for the passage 98 ″ facilitates the entry of the rod 86 into the second section 99b. The leading end of the second section 99b is connected to an injection molding block 105

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BAD OiIiGINAL

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bond that has a central passage 106. One in the injection block 105 "located annular recess 108 is on the one hand with the central passage 106 and on the other hand with a plurality of coolant inlet lines 107 in connection, which the annular recess 108 coolant. One conical recess 110 extends from the annular Recess 108 along the central passage 106 in the direction of the second section 99b. A measuring pin 111 is in screwed in the injection block 105 and protrudes into the conical recess 110. The measuring pin has a tapering one End 112, which corresponds to the conical recess 110. A central channel leading through the measuring pin 111 is in a line with the central passage 106 that the rolled bar 86 can pass through at this point.

In that the measuring pin 111 is set so that the tapered end 112 into the conical recess 110 protrudes, the amount of coolant is controlled, which from the annular recess 108 along the conical Recess 110 can flow into the central passage 106. on in this way the flow rate of the coolant, flowing into and along central passage 106 and which flows along the passage 98V of the second section 99B in the direction of the rolling train 12, controlled by the fact that the measuring pin 111 is within the Injection block 105 is rotated .. Takes the distance between the conical recess 110 and the tapered end 112 of the measuring pin 111 decreases, the flow rate of the coolant flowing into the central passage 106 increases; on the other hand, if the distance between the conical recess 110 and the measuring pin 111 increases, the flow rate increases of the flowing into the central passage 106

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Coolant from · The coolant flows along the passage 98 * of the section 99b, and into the catch basin 100, where it expires. The coolant located within the cooling tube 99 is made to oxidize by the heat of the metal strand 86, whereby a reducing ambient air is created, which also reduces the slightest layer of oxide that may reappear on the metal rod 86 after rolling has formed.

A further catcher tank 10O ^1, st the catch basin 100 is similar to i "is fixed on the other side of the injection block 105 and is on its other side with a Blasreinigungsblock 116 in connection. The other side of the gauge pin ΛΛ \ has a tapered shoulder 114 which protrudes into a conical recess 115 of the blow cleaning block 116. The blow cleaning block 116 has a plurality of angularly offset openings 118 which are connected at one end to a passage 119 for the rod through the block 116 and at the other Ends correspondingly in communication with a plurality of air supply tubes 120. The openings 118 are arranged so that air or any other similar gas flowing from the supply tubes 120 through the openings 118 is directed along the passage between that on the measuring pin 111 located shoulder and the conical recess 115 is located, whereby the air flow then against the Rod 86 is guided so that any coolant remaining on the rod 86 is removed. In this way, any coolant on the rod 86 is blown away from it as it leaves the central channel passing through the measuring pin 111; the coolant removed in this way is blown ^{into the catch basin 100 f} by the medium flow flowing out of the openings 118 and flowing along the passage located between the measuring pin 111 and the recess 115.

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The rod 86 then runs into the third section 9c of the Cooling tube 99, which has cooled below the oxidation temperature of the rod. The rod 86 has on this It has the desired hot rolling properties due to the temperature control, and it is thus ready for use for subsequent treatment by pulling, winding or storage, all of them being in one oxide-free state.

Operation

During operation, the metal strand .16 from the casting wheel 22 comes from, in the channel 25 of the stripping chamber 19, where he is immediately enveloped by an inert or reducing medium, which flows along the channel 25 opposite to the direction of movement of the metal strand 16. This is how the metal strand is 1 6 subjected to environmental conditions in which it forms practically no oxide film when it is removed from the casting wheel the pouring device 18 is withdrawn and / or is supplied with a certain amount of reducing agent, the one Oxide skin that has formed on the strand during casting is removed. The stripping chamber 19 can easily be so be modified so that it takes up a metal strand 16, which was cast by other types of casting equipment of a known type; and also prevents such a stripping chamber then an oxidation of the metal strand 16 when it is ejected from such a different type of casting device.

The metal strand 16 runs along the stripping chamber 19, through the flexible connector 21 and into the transfer chamber 20, where it is gripped by the rollers 38. All of this takes place while the strand of the inert, i.e., protective medium or reducing medium is enveloped, which is fed into the transfer chamber 20 through the pipe 44

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will. After the metal strand 16 has run away over the rollers 38 is, it is continued on the bearing rollers 39 along the transfer chamber 20, is picked up by the pinch rollers 4o and is fed into the heating chamber of the temperature control oven 11 aligned. The insulation 34 · on the inside The transfer chamber 19 essentially prevents the strand 16 from radiating heat during its passage through the transfer chamber 20 and thereby suffering heat losses. In this way you are using the protective or reducing agent and by means of the insulation 34 during the run of the metal strand 16 mit.seift by the on sewing member 10 ner transfer chamber 20 both oxidation losses and radiant heat losses on the metal strand 16 avoided.

The metal strand 16 now runs into the heating chamber, where it is heated or cooled until the pre-determined hot working temperature is reached; In addition, the burrs on the edges of the strand in the heating chamber are removed with the aid of the exhaust burner 131. The thermocouple 123 arranged at the inlet of the heating chamber determines the temperature of the metal strand 16 when it enters the heating chamber and transmits an electrical signal to the voltage regulator 121 which, in accordance with the temperature of the strand 16, the voltage supply to the burner motor 62 ', to the pump motor 64 ', ™ to pump motor 56' and water pump motor 68 '. The temperature limit switch 120 operates the burner motor 62 ', the pump motor 64' and the water pump motor 68 *, whereas it stops the pump motor 56 ' _f when the temperature of the strand 16 is above the predetermined temperature; on the other hand, the temperature limit switch operates the pump motor 56 ¹ , whereas it stops the burner motor 62 ', the pump motor 64' and the water pump motor 68 when the temperature of the strand 16 is below the predetermined temperature. In this way the temperature of the metal

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stabs 16 automatically controlled when it passes through the heating chamber. In addition, any oxidation skin that may have formed on the strand 16 is reduced quickly and effectively, so that the strand 16 enters the roller train 12 via the pinch rollers 70 in an oxide-free state. This eliminates the problems which arise when the rolling process is carried out on a strand that has an oxide scale. The heating chamber is capable then to reduce the oxide layer located on the metal strand 16 itself, that is, to remove, even if no precautions against oxidation by means of an opening located between the casting wheel 22 and the heating device is provided sindj there%

only large amounts of fuel need to be fed into the heating chamber. However, this is uneconomical and the facility is only operated in this way if that Pick-up member 10 fails.

The metal strand 16 is aligned by the pinch rollers 70 and enters the rolling train 12 for rolling. The metal strand 16 is then rolled out into a bar 86 by the roller 89, while coolant is supplied through the nozzles 92. As a result, the temperature of the metal strand 16 is kept at the correct level during the rolling process. The coolant is partly replaced by the λ

Metal strand 16 and the rollers 89 radiating heat brought to oxidize and generated from the inside to the outside the cover 14 a slight. Pressure gradient. To this In this way, oxidation of the metal rod 16 is prevented. In addition, the prevailing within the chamber 85 can Pressure can be supplemented by a reducing agent, the is .einfeist under pressure by means of the nozzles 95. Burning the coolant creates in the neighborhood the surface of the metal strand 16 is a reducing ambient medium. This prevents the formation of oxide layers,

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while the strand 16 is being rolled; in addition, the Removed the smallest oxide layer, which may have settled on the surface of the metal strand 16.

The rod 86 leaves the rolling train 12 at an elevated temperature and runs into the cooling pipe 99, in which a Reducing agent envelops the rod 86 and cools it below its lowest oxidation temperature. The coolant flows from the recess 108 along the space between the conical recess 110 and the measuring pin 111 is located; the coolant envelops the rod 86 as it travels along the central passage 106 and along the passage 98 * flows. The flow of the coolant takes place in the opposite direction to the direction of movement of the rod 86, namely in the direction of the Pang basin 100, where the coolant drains off.

The rod 86 passes through the blow cleaning block 116, " in which the air blown out of the openings 118 removes any coolant remaining on the rod 86 is available. The rod 86 is then prepared for subsequent treatment, for example for winding in coil form or for wire drawing, and there is no risk of oxidation.

In a second exemplary embodiment, all parts of the device for the method are the same, with the exception of the roller train 12 ', which takes the place of the roller train 12. The rolling train 12 ¹ receives the cast strand 16 from the heating chamber and rolls it into a bar 86; meanwhile, the strand 16 or the rod 86 is enveloped by a reducing agent which is supplied by the burnt coolant from the manifold 88 and the nozzles 92. The roller train 12 'then carries the rod 86 into the cooling pipe 99, where it is applied is cooled in the manner already indicated. 4098 H / 05 36

The rod 86 is then attached to the third section 99c of the cooling pipe 99 recorded in an oxide-free stage, being, they as a result of proper temperature control possesses the desired hot rolling properties, both what the strength, the plasticity as well as the conductivity concerns.

'Claims

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Claims (2)

Claims 1. Process for the continuous production of a metallic strand with an oxide-free, bare surface underneath Use of a continuously operating casting machine with a casting device and a downstream hot forming device, characterized in that according to the after leaving the casting device in the hot forming device entering strand in the hot forming device a lubricant is supplied that cools it and reduces its oxidation during hot forming, and that a non-oxidizing atmosphere is maintained in the hot working device during the hot working is obtained. 2. Device for performing the method according to claim 1, characterized in that a device for supplying a lubricant is provided in the hot forming device to the surface of the strand is contained, which cools the strand and reduces its oxidation, and that the hot working device is closed in such a way that a non-oxidizing atmosphere in it during operation is maintained. 4 0 9 8 14/0536 Blank page