DE3100143A1 - Method for the continuous casting and rolling of metallic workpieces in line - Google Patents

Abstract

The method is suitable for the economic production of semi-finished products in the form of round, hollow and polygonal sections from metallic materials. The direct succession of melting, horizontal casting and rolling in just one line frees the method from the need for any intermediate transfer facilities, as required hitherto. A transfer channel which consists of thermally insulating materials, is closely matched to the cast section and connects the individual work stages, ensures that the rolling stock retains its primary energy introduced during the melting process sufficiently to ensure that only a little additional energy or none at all is required for the rolling process.

Description

Process for the continuous casting and rolling of

metallic materials in line Production of semi-finished products such as z. B. Billets and strips made of metallic materials are currently happening in several separate production lines.

To dispose of the prefabricated products to the stages of material melting, Chill or slab casting and pre-rolling and finish rolling require long transport routes and times needed. During these transports, the semi-finished products lose theirs primary casting temperature and usually have to turn from room temperature to rolling heat be heated. This naturally causes high costs in terms of the transport conditions and above all, the national economy is subject to great burdens from the multiple necessary energy input.

The invention has therefore set itself the task of providing a method to develop that prevents the aforementioned disadvantages.

The solution for this results from the immediate stringing together of the production stages - material melting - profile casting in horizontal continuous casting - Pre and finish rolling in one production line.

The capacities of all individual production stages are so interrelated coordinated that a strand of material is formed that all parts of the system continuously passes through.

This eliminates any intermediate transport of the rolling stock from one Production line to the other, as has been the norm up to now.

About the primary energy used for melting and casting in the material strand up to the last rolling pass, becomes the material strand constantly guided in well thermally insulated transport chambers, so that the heat radiation is largely prevented in the free space.

These transport chambers are designed according to the invention so that they optimally adapt to the material strand in terms of shape and size. I.e. if a maximum Round billets with an outer diameter of 100 mm are to be produced, so the shape of the heat-insulated transport channel must also be round and have a clear diameter of approx. 150 mm.

If, on the other hand, the focus of the production program is on rectangular ones Casting formats, the shape of the transport channels will also be rectangular.

According to the invention, the transport channel itself consists of a cellular ceramic Thermal insulation body with an inserted, highly wear-resistant half-shell made of high-density Ceramic material with a heat resistance of more than 10000C. This material is anti-adhesive to the hot strand of material, so that when the Strands between this and the half-shell no disturbing caking occur can.

The inventive arrangement of the production stages melting, Casting, rolling in line, only one operation has to be switched on and that is Separation of the material strand to the length of the roller insert. This process takes place approx. every 10 minutes.

The cutting process takes about 30 seconds. This is where the cutting process begins carried out by means of technically known devices such as sawing, burning or shearing The cutting device is also capable of losing as little heat as possible through the cutting process arranged outside the production line and is only used during the short cutting process driven into the line. Parallel to the retraction of the separating device opens according to the invention a segment of the transport channel and moves out of the line. The separating device is pushed into the space thus freed up clinging to the running strand and cutting it to the desired length in synchronism cut up for the rolling process.

After this short separation process, the device will turn off in E moved out of the production line. In parallel, the segment piece of the Transport channel back to its original position and protects the one passing through Strand to the next cut from heat loss.

Should the inherent heat of the strand undercut in the area of the cut edges the required rolling heat fall, this is according to the invention by a short Compensated for thermal shock that hits the strand of material immediately before rolling.

To ensure that this heating surge hits the strand exactly at the points where the temperature is too low, an accurate temperature measurement ensures, whose sensors inside the transport channel constantly monitor the running material strand only scans its target temperature. Does the actual value measured differ from the TARGET value, an H.-F.- Inductor ring, through which the strand runs continuously, according to the measured false heat a metered pulse for heating, so that the rolling heat is reached again.

Corresponding to the physically determined mode of operation of the high-frequency With resistance heating, this process happens extremely quickly.

The distance between the production stage "strand cutting" and "rolling start" is defined according to the invention in such a way that the casting process is not disturbed in terms of time can. The scale for this distance is determined by the amount of time the Rolling operation required, which is the most extensive according to the production program, as well as the lowest feed difference between casting and rolling speed.

Correct coordination of these factors is lower than one another the continuous workflow of melting, casting and rolling in one and the same Line guaranteed.

A further development of the invention deals with the casting and Rolling relatively thin strips. After casting a tape with a tape thickness of 15 mm belongs to the state of the art for non-ferrous metals, this is the case with horizontal Strip casting from steel not possible.

This is where implementation begins with a strip thickness of 30 mm. This However, the starting strip is not suitable for use in modern high-performance rolling mills, in which the initial sliver thickness is reduced by 95 t in just one pass. at With this system, the initial tape thickness must not be thicker than 15 mm. To now too the very cost-effective high-performance rolling on the material steel (stainless steel, alloyed steels) is transferred when casting a mother tape with 30 mm Wall thickness according to the invention between the casting mold and the extraction driver a hot band saw set, which sandwiched the cast 30 mm thick tape in 2 15 mm separates. The feed force for the sawing process is generated by the rollers of the pull-out driver applied, which pull the tape through the saw.

When starting a new format, a piece of tape l) is used, the already has a central slot into which the saw blade is inserted before one end of the piece of tape is welded to the new strand.

The front face of the piece of tape, seen in the direction of production is picked up by the rollers of the pull-out driver at the start of production and conveyed onwards.

The split band exiting after sawing, each with a wall thickness of 15 mm can be separated with technically known means and then in conventional Way can be processed in the perforated rolling mill.

In the accompanying drawings, the operation of the invention Procedure shown schematically.

Figure 1: A top view of the entire production line Figure 2: A cross section in the area of the strand separation. Figure 3: A cross section in the area of heating up.

Figure 4: A cross section through the transport channel Figure 5: The arrangement of the band saws In Figure 1, production begins with the melting of the starting material in the melting furnace (1). The melted material comes from the melting furnace (1) into the Holding furnace (2) on the lower part of which the casting mold (3) is attached. By the water cooling acting in this area begins to solidify the liquid material and leaves the mold in strand form with a heat slightly higher than that later Rolling temperature is.

The strand (4) is driven by the extraction rollers (5) and (6) of the Pull-out driver (7) detected and conveyed forward by these. Serves as a guide the well thermally insulated transport channel (8).

Behind the pull-out driver (7) is the separating device outside the line #) arranged, the strand in individual lengths according to the desired rolling length divided, which reach the rolling mill (10) by means of the transport channels.

The one that works at a higher speed than the pull-out driver (7) The rolling mill (10) can be designed as a strip mill or a billet mill. Does it work As a high-performance strip rolling mill, the finished strip is reeled up. Does it work (as shown) as a billet mill, the strand (4) can be rolled over several times leave the street as a round or profile bar or as a wound wire bundle (11).

FIG. 2 shows how the strand separation works while production is running. While the transport channel segments (12) and (13) by means of the cylinders (14) and (15) were opened and by the cylinder (16) with the carriage (17) out of line were moved out, the mobile saw (18) from the cylinder (19) is in the line been driven. The cylinder (#) presses the clamping jaws (21) and (22) against the running one Material strand (4).

As a result, the saw runs in synchronism with the strand (4).

The cylinder (24) presses the driven one via a rocker structure (23) Saw blade (25) on the strand of material (4 until it is separated. Thereafter it is obtained the saw blade (25) impulse to return and the clamping jaws (21) and (22) command to the open.

Now the saw runs back to the starting position and the transport channel segments (12) and (13) are returned to their normal position.

In Figure 3 is the strand of material (4) together with the inductor ring (26). The water-cooled inductor ring (26) heats the strand (4) inductively in the run according to the pulses he receives from the temperature measuring device (27).

Figure 4 shows in cross section the strand of material (4) and from the outer segments (28) and (29) as well as from the inserted wear half-shell (30) existing transport channel (8).

FIG. 5 shows the separation of a rectangular tape format schematically recognize in two layers. The tape strand is continuously driven by means of the Saw band (31) separated like a sandwich.

All features mentioned in the preceding description and / or are shown in the drawing, provided that the known state of the art this allows, on its own or in any combination or partial combination are regarded as essential to the invention, even if they are in the claims are not included.

Claims (7)

Claims 1. A method for continuous casting and rolling of metallic materials, characterized in that the production stages melting (1), casting (3) and rollers (10) are arranged one behind the other in a line and as Processing temperature use the primary melting heat. 2. The method according to claim 1, characterized in that immediately after the solidification of the strand (4) this is introduced into a transport channel whose outer segments (28) and (29) made of cellular ceramic thermal insulation material and its inside Inlaid half-shell (3) made of high-density, wear-resistant and opposite to hot Metal anti-adhesive material with a heat resistance of more than 10000C. 3. The method according to claim 1 and 2, characterized in that the running saw (18) is arranged outside the line and only during the cutting process is moved by means of cylinder (19) to separate the strand (4) and that during of the separation process, the two transport channel segments (12 and (13) open from the Can be driven in a line, but immediately after separation by means of the cylinder (16) in line promoted and thermally insulating with mushrooms of the two cylinders (14) and (15) in turn put it around the strand immediately. 4. The method according to claim 1, characterized in that the strand (4) shortly before entering the rolling mill (10) by means of the temperature measuring device (27) is constantly checked for the target roll temperature and that if it falls below same the continuous strand (4) with the help of the water-cooled H. -F. Inductor ring (26) is reheated to exactly the prescribed temperature. 5. The method according to claim 1, characterized in that during the casting a tape format with a tape thickness of more than 15 mm in front of the pull-out driver (7) a band saw working in the longitudinal direction of the strand (4) is arranged, the The saw band (31) separates the strand (4) into two halves like a sandwich. 6. The method according to claim 1, characterized in that the rolling mill (10) works with an increased feed movement compared to the casting speed and that the distance between the strand saw (18) and the rolling mill ~ (10) is chosen to be so large is that the beginning of the following billet only then reaches the rolling mill (10), when the rolling program of the previous strand part has ended. 7. The method according to claim 1 and 2 thereby gekennzeicl) -net that the The shape of the transport channel (8) is largely based on the shape in terms of its geometry of the strand (4) adapts.