KR100456913B1 - Upset tool in pair of upset tool for forming continuous cast slab in slab upset press - Google Patents

Abstract

An upset tool of an upset pair of tools for forming a continuously cast slab in a slab upset press, having an upset forming surface for pressing both longitudinal sides of the slab, the upset forming surface being parallel to the direction of motion of the slab. Or an inclined upset forming surface attached to the parallel upset forming surface, the inclined extending so as to be connected to each other, and away from the longitudinal side of the slab, and the two or more additional upset forming surfaces 1a ', 1a "are connected to the first upset forming surface ( An upset tool having an inclination angle a1; a2 smaller than the inclination angle α of 1a and adapted to be attached to the first upset forming surface 1a is measured in the plane XX of the parallel upset surface 1b. The distance L1 between the two edge edges AK and ZK of the first additional upset molding surface 1a 'connected to the exit edge AK of the first upset molding surface 1a is the first additional upset molding surface la. Between the edges ZK and EK of the second additional upset forming surface 1a " It is improved by less than (L2).

Description

Upset tool of upset tool pair for forming continuous cast slab in slab upset press

The present invention relates to an upset tool of an upset tool pair for forming a continuously cast slab in a slab upset press, wherein a conveying device of the upset tool is driven by two eccentric shafts and two upset tools. It consists of a connecting rod for supporting and moving parallel to the connecting rod, combined with a piston-cylinder device for generating an upset tool movement on the roller table in synchronism with the slab movement, and the upset tool for each of the slab An upset forming surface for urging the longitudinal side, the surfaces being formed parallel or inclined to the direction of motion of the slab or its longitudinal side, connected to each other to form an edge extending across the direction of movement, the slab The upset forming surface is inclined away from the longitudinal side of the slab parallel to the direction of movement of the slab. It is placed behind or optionally in front of the set face.

According to this type of upset tool (see Iron and Steel, Sept. 1990), the slab to be upset is located in the center between two paired upset tools on the roller table, with the slab stationary or in motion. Synchronized movement of the upset tool occurring across the upset press direction causes the upset-flow-molding to be carried out in both longitudinal directions by the respective upset forming surfaces of the upset tool. This causes the slab to be pressed into a so-called "dog-bone" cross section as described above in the first machining step. The narrow part of this cross section is determined by the upset molding surface in terms of its shape and dimensions. In the further machining steps that follow, both upset tools move away from each other across the direction of movement of the slab on the roller table and at the same time the slab moves forward to a given predetermined size and the wider part of the dogbone cross section faces each other. This leads to end regions of the two upset molding surfaces which are located close together. At this position the slab is brought to rest again and the upset tool continuously upset-flow-forms the subsequent part of the slab that has not yet been upset.

Coordination of the successive forming steps with the slab movement, i.e. synchronizing the forward movement of the upset tool with the slab movement speed without disturbing the slab movement, while keeping the slab over the length of the slab while the upset tool is in contact with the slab side wall. Molding has already been proposed. By moving this predetermined length, the forming step and the contact with the slab of the upset tool are terminated.

The upset tool then moves together first and then to its respective dead point relative to the direction of slab movement, while the slab is then constantly moved forward by a predetermined length.

With this upset method with the upset tool a relatively flat slab side wall surface is obtained; However, it also often results in wave-like protrusion irregularities that extend somewhat uniformly and continuously across the sidewall length of the slab across the longitudinal direction of the sidewall.

Attempts have been made to cope with the occurrence of these wave-like protrusions by varying the feed distance and feed rate in relation to the temporal progression of the upset tool movement and by using upset tools with upset facets of different inclination angles. Attempts have been made to reduce this, but have not completely prevented the occurrence of wave-like projections.

It is an object of the present invention to improve the embodiment of the conventional upset tool to prevent the wave-like projection. This object is solved as one or several additional upset molding surfaces are attached to the inclined first upset molding surface with an inclination angle smaller than that of the first upset molding surface.

Due to this structure of the upset tool, the wave-shaped projection described earlier in the region of the exit edge between the upset and parallel upset faces during upset-flow-forming is similar to rolling by the additional upset face. It is depressurized in the process step and also prevented its occurrence depending on the given upset press conditions and the material condition of the slab.

As suggested by the present invention, the inclination angle of the additional upset molding surface may be different or the same.

In an upset tool with two additional upset facets, the distance between the two edges of the first additional upset face in contact with the exit edge of the upset face is measured in the plane of the upset straightening face extending parallel to the direction of movement of the slab. Is less than the distance measured between both edges of the second additional upset molding surface in connection with the first additional upset molding surface.

The distance between the edges of the first additional upset molding surface corresponds to approximately half of the distance between the edges of the second additional upset molding surface. Furthermore, the length of the parallel upset face measured from the exit edge of the second additional upset face to the free outlet of the parallel upset face is approximately three times the length of the parallel upset face of the comparable upset tool with only one upset face. Corresponds to one-third

The vertical distance from the plane of the parallel upset forming surface to the exit edge of the first upset forming surface corresponds to the height of the sidewall deformation made during the upset press of the slab by a comparable upset tool with only one upset forming surface.

As the present invention finally proposes, an upset tool with the features according to the invention is provided from an upset tool having only one upset forming surface and an upset calibration surface connected via an exit edge thereof, so that the exit edge of the upset molding surface is Both additional upset faces are produced through material cutting so that they are placed in the front and upper regions of the position of and the parallel upset face is reduced to approximately one third of its original length.

Due to this structure of the upset tool, the wave-shaped protrusions initially occurring in the range of the exit edge between the upset forming surface and the parallel upset surface during upset-flow-forming are pressurized in a process step similar to rolling by an additional upset forming surface. Either removed or, depending on the given upset press conditions and the material condition of the slab, its occurrence is largely prevented.

In practical use of this embodiment, the inclination angle of the further upset face is in the range of 0.5 ° to 8 °, especially when the inclination angle of the first upset face is about 11 ° to 13 °, preferably 12 °. It must be removed and the wave-like protrusions are actually removed.

It is known that the inclination angle of the additional upset molding surface in contact with the first upset molding surface is 5 °, and the inclination angle of the additional upset molding surface in contact with the first upset molding surface is 1 °. It is also known that an inclination angle of 0.5 ° to 2 ° with respect to the inclination angle of the additional upset molding surface in the first position and an inclination angle of 4 ° to 8 ° with respect to the additional upset molding surface in the second position are known to be very desirable. .

Also in practical use of this embodiment, the inclination angle of the further upset face is in particular 0.9 when the first upset face is about 19 ° to 20 °, preferably 19.8 ° and three additional upset face are arranged. To 10 °, preferably 0.91 ° to 19.8 °, in which the wave-shaped protrusions are actually removed. In addition, the inclination angle of the additional upset molding surface in contact with the first upset molding surface is 9.1 °, the inclination angle of the additional upset molding surface in contact with the first upset molding surface is 5.2 °, and the angle of the additional upset molding surface in contact with this is 0.91 ° and It is known that it is particularly preferable for the exit face with a slope of 12 ° to be connected to the tangent parallel upset face.

In addition, when the inclination of the first upset molding surface is about 12 °, it is also possible for the two further upset molding surfaces to be connected with the inclination angle of 5.2 to 0.91 ° and the inclination angle of the outlet surface of 12 °, respectively.

However, the upset tool also does not provide satisfactory material flow at the slab head and the slab end. Slab heads are often inclined depending on the extent of their reduction.

As a result, the width of the slab head becomes narrower than the width of the slab center part. The material is shaped by an upset molding surface that is inclined correspondingly to the slab direction of motion at the slab end. This results in the formation of different dogbone cross sections at the slab head and the bottom compared to the slab center.

In a further proposal of the invention, this disadvantage is that an upset molding surface in which two or several groups of upset molding surfaces are formed in parallel with each other, and an inclined angle which is placed in front of the upset surface in the direction of the inlet of the press interval formed by the upset tool and increases. It is dealt with by forming the upset molding surface of the upset tool so that it consists of the inclined upset molding surface of polygonal form with a degree. It is also known that such an upset molding surface is preferably formed in three groups as a whole.

The material flow in the slab head and the slab end proceeds very well. The dogbone cross section is formed more uniformly over the entire length of the slab.

The upset tool thus formed is fed to the position of the upset tool pair in the slab upset press, regardless of the respective position of the slab head relative to the position of the upset tool, towards the press spacing formed by the upset tool pair by the roller table. The upset tool pair is conveyed at a pre-computed feedrate before forming the press interval and in turn the width is reduced by the upset tool pair in the subsequent upset stroke, where the contact step between the upset tool and the slab of the upset tool pair, It is used in such a way that the forward movement of the upset tool and slab proceeds synchronously.

However, the slab can also be moved by the roller table to a precomputed position relative to the slab head between the upset tools in order to apply the initial press of the upset tool.

The upset strokes which in turn can also be set to different lengths depending on the respective required forward speeds of the slab and upset tool and the corresponding synchronized movement. The different stroke lengths may be determined such that the contact between the upset tool and the slab in the final press stroke is made at a predetermined place on the upset forming surface of the upset tool.

The invention is described in more detail by the embodiment shown in the drawings.

The part 1 of the upset tool shown in FIG. 1 has an upset forming surface 1a and a parallel upset surface 1b. The first upset molding surface 1a forms an inclination angle α with respect to the plane X-X of the parallel upset surface 1b. The upset molding surface 1a is followed by further upset molding surfaces 1a ', la "behind the exit edge AK. Both of these additional upset molding surfaces la', la" are parallel upset surfaces 1b. The inclination angles a1 and a2 are formed with respect to the plane XX of, respectively, which are smaller than the inclination angle α of the first upset molding surface 1a with respect to this plane. In the illustrated embodiment the exit edge AK measured at both boundary edges of the first additional upset face 1a 'adjacent to the first upset face 1a, ie in the plane XX of the parallel upset face 1b. The distance L1 between the edge and the intermediate edge ZK is at both boundary edges of the second additional upset molding surface 1a "connected to the first additional upset molding surface 1a ', that is, the intermediate edge ZK and the final exit. It is shorter than the distance L2 between the edges EK.

In the embodiment, the interval L1 between the boundary edges AK and ZK of the first additional upset molding surface 1a 'is equal to the interval L2 between the boundary edges ZK and EK of the second additional upset molding surface 1a'. Approximately equal to half of the length of the parallel upset face 1b measured between the final exit edge EK of the second additional upset forming surface 1a "and the free outlet A of the parallel upset tool surface 1b. L3) corresponds to approximately one-third of the length of the parallel upset face of the comparable upset tool with one upset face, whose exit edge is illustrated by a dashed line as AK '.

The vertical distance a from the plane XX of the parallel upset surface 1b to the exit edge AK is a slab with an upset tool having an upset surface when the exit edge is assumed to be the above-mentioned position AK '. May be determined to correspond approximately to the sidewall deformation height not shown in the upset press.

The illustrated upset tool has only one upset surface and as a result, from the upset tool where the exit edge AK 'is located at the position, the exit edge AK of the upset molding surface is forward of the original position AK'. And cutting the material so that it is placed in the upper region and the upset calibration surface 1b is reduced to one third of its original length as described above.

The part 1 of the upset tool shown in FIG. 2 has a first upset forming surface 1a and a parallel upset surface 1b. The first upset forming surface 1a forms an inclination angle α with respect to the plane X-X of the parallel upset surface 1b. The first upset molding surface 1a is followed by further upset molding surfaces 1a 'and 1a "after the exit edge AK.

Both of these additional upset molding surfaces 1a 'and 1a "form angles of inclination α1 and α2 with respect to the plane XX of the parallel upset surface 1b and they are the first upset molding surface 1a with respect to this plane. It is smaller than the inclination angle α of.

The upset tool of FIG. 3 has a first upset molding surface 1a which forms an inclination angle α with respect to the plane X-X on which the parallel upset surface 1b is located. The first upset molding surface 1a is followed by further upset molding surfaces 1a ', 1a ", 1a"' behind the exit edge AK. This further upset forming surface forms an inclination angle α ', α ", α'" with respect to the plane X-X. This inclination angle is smaller than the inclination angle α of the first upset molding surface 1a with respect to this plane. The later upset forming surface 1a '"is connected with a parallel upset surface 1b, to which an inclined outlet surface 1c is connected with an inclination angle B.

The embodiment of the upset tool 1 according to FIG. 4 is described above in FIG. 3 except that only two further upset molding surfaces 1a ', 1a "are connected to the first upset molding surface 1a. Matches the configuration.

The upset tool WZ shown in FIG. 5 has a plurality of upset tool surfaces ak, the upset tool surface of which is illustrated by a dashed-dotted slab when the upset tool WZ moves in the direction of the arrow P. It is suitable for pressing the side SF of BR). In this movement of the upset tool WZ, the part which first comes into contact with the side SF is an upset forming surface a parallel to the direction of motion B of the slab BR, in front of which the two mirrors are formed in a polygonal manner. The photo upset molding surfaces b and c are placed. The inclination angles α 1 and α 2 increase (ie, α 1 <α 2).

The upset molding surface of the second group is connected to the free side of the parallel upset molding surface of the first group of upset molding surfaces a, b, and c, and the upset molding surface of the second group is stepped with respect to the first group. , A parallel upset forming surface d and an inclined upset forming surface e, f arranged in front of the polygon with the same increasing angles of inclination α3, α4 (ie α3 <α4). The final third group of upset facets are also equally inclined upset facets (h, i, k) arranged in front of the polygons with the same inclination angles (α5, α6, α7) and the parallel upset facets (g) connected thereto. Equipped)

In the illustrated embodiment, the three groups of upset molding surfaces a, b, c; d, e, f and g, h, i, k are the first group of inclined upset molding surfaces h and the first group. And two parallel upset forming surfaces (a, d) of the second group, which have the same length (m2, m5, m8) in the direction of motion of the slab. The third group of upset molding surfaces (g) formed in parallel, the inclined upset molding surfaces (i, k) of this group and the inclined upset molding surfaces (e, f) of the second group also have the same length (m1, m3). + m4, m6 + m7).

These lengths can be sized or divided depending on the work needs and experience.

6 to 11 show how the upset tools WZ1 (FIG. 6) and WZ2 of the upset tool pair act on both sides SF1 and SF2 of the slab BR. FIG. 6 shows the press spacing SP formed by the upset tools WZ1 and WZ2 and the head of the slab BR which is conveyed by a roller table (not shown). The head of the slab is positioned so that the front edge VK is at the lower part of the center of the parallel upset forming surface of the first group of upset forming surfaces upon further conveying in the direction of the press spacing SP.

The upset tools WZ1 and WZ2 execute the first upset stroke against each other to upset the slab head in the form shown in FIG. This is done by pressing the slab side surfaces SF1 and SF2 by all the upset molding surfaces a, b and c of the first group. Subsequently, the upset tools WZ1 and WZ2 are further away from each other and the slab head is pushed to the position of the center lower portion of the parallel upset forming surface d of the next group of upset forming surfaces approximately at the front edge thereof. Next, the slab head is driven by the second upset stroke and the side face SF1, by the upset shaping surfaces d, e and f of the second group and the upset shaping surfaces a, b and c of the first group. By simultaneously pressing SF2), it is formed in the shape shown in FIG. Then, after the press spacing SP is opened again, the front edge VK of the slab head is located at the center lower part of the parallel upset forming surface g of the third group of upset forming surfaces, and the slab at the subsequent upset stroke. Sides S1 and S2 of the head are formed on the entire upset molding surfaces g, h, i, k; d, e, f and a, b, c as the upset molding surfaces of the third, second and first groups. Are simultaneously pressed to form the shape given in FIG. The width of the slab head is reduced to the expected size through these three upset strokes (Figure 10) and the remaining length of the slab BR, which is not yet deformed, is correspondingly reduced in the further upset stroke. Subsequently, the slab exits from the press interval SP as shown in FIG.

1 is a plan view of the upset tool,

2, 3 and 4 are plan views of additional embodiments of the upset tool,

5 is a plan view of another embodiment of the upset tool, and

6 to 11 schematically show the upset tool pair according to FIG. 5 during the upset process at different locations,

Explanation of symbols on the main parts of the drawings

1a, 1a ', 1a ", 1a'"; Upset Face

a, b, c, d, e, f, g, h, i, k; upset face

α, α1, α2, α ', α ", α'"; Inclination angle

1b; upset face WZ1, WZ2; upset tool

Claims (18)

An upset tool of an upset pair of tools for forming a continuously cast slab in a slab upset press, having an upset forming surface for pressing both longitudinal sides of the slab, the upset forming surface being parallel to the direction of motion of the slab. Or an inclined upset forming surface attached to the parallel upset forming surface, the inclined extending so as to be connected to each other, and away from the longitudinal side of the slab, and the two or more additional upset forming surfaces 1a ', 1a "are connected to the first upset forming surface ( In the upset tool which is attached to the 1st upset molding surface 1a with the inclination angle (alpha) 1 (alpha) 2 smaller than the inclination angle (alpha) of 1a), Between the boundary edges AK and ZK of the first additional upset molding surface 1a 'connected to the exit edge AK of the first upset molding surface 1a measured in the plane XX of the parallel upset surface 1b. The distance L1 is shorter than the distance L2 between both boundary edges ZK and EK of the second additional upset molding surface 1a 'connected to the first additional upset molding surface 1a'. . The distance L1 of the boundary edge AK; ZK of the first additional upset molding surface 1a 'is approximately half of the distance between the boundary edges ZK and EK of the second additional upset molding surface. Upset tool, characterized in that corresponding. The further upset according to claim 1, wherein the inclination angle α of the first upset molding surface 1a is 11 ° to 13 ° and two additional upset molding surfaces 1a 'and 1a "are attached thereto. The upset tool, characterized in that the inclination angle of the forming surface is about 0.5 ° to 8 °. The angle of inclination α 'of the additional upset molding surface 1a' in contact with the first upset molding surface 1a is between 4 ° and 8 °, and the additional upset molding surface 1a "connected thereto. The inclination angle α "is an upset tool, characterized in that 0.5 ° to 2 °. The inclination angle α 'of the additional upset molding surface 1a' connected to the first upset molding surface 1a is 5 °, and the inclination angle of the additional upset molding surface 1a "connected thereto is α ″) is 1 °. 3. The further upset molding surface 1a ', 1a "according to claim 1, wherein the inclination angle α of the first upset molding surface 1a is between about 19 degrees and 20 degrees, preferably 19.8 degrees, and connected thereto. When 1a '"is disposed, the inclination angle of this further upset face is approximately 0.9 ° to 10 °, preferably 0.91 to 19.8 °, and the additional upset correction face 1b is followed by an inclination angle of 12 ° ( An upset tool characterized in that the outlet face 1c having β) is connected. The inclination angle α 'of the additional upset molding surface 1a' in contact with the first upset molding surface 1a is 9.1 °, and the inclination angle α of the additional upset molding surface 1a "connected thereto. ") Is 5.2 degrees, and the inclination angle (alpha ') of the further upset surface (1a'") connected thereto is an upset tool, characterized in that 0.91 °. The inclination angle of the first upset molding surface 1a is 12 °, the inclination angle of the further upset molding surface 1a 'is 5.2 °, and the further upset molding surface 1a' connected thereto. Upset tool, characterized in that the inclination angle is 0.91 °. 2. An upset forming surface (a; d) as set forth in claim 1, characterized in that one parallel upset forming surface (a; d; g) and an inlet direction of the press spacing (SP) formed by the upset tool (WZ1; WZ2); g) an upset tool comprising two or more groups of upset molding surfaces, each consisting of an upset molding surface (b, c; e, f; h, i, k), each of which is inclined in front and has an increasing angle of inclination to form a column of polygons; An upset tool characterized by forming an upset molding surface of (WZ1; WZ2). 10. The upset tool according to claim 9, wherein the upset molding surface of the upset tool (WZ1; WZ2) is formed entirely of three groups of upset molding surface. 11. The method according to claim 10, wherein in the case of three groups of upset molding surfaces (a, b, c; d, e, f, g, h, i, k), when measured in the moving direction of the slab BR, The inclined upset face (h) of the group and the parallel upset face (a; d) of the first and second groups have the same length (m2; m5; m8) and the parallel upset face of the third group and (g) and the inclined upset forming surfaces (e, f) of the second group are equal in length (m1, m3 + m4, m6 + m7) to each other. 11. The method according to claim 10, wherein the last inclined upset face c of the first group is slightly less than the length m7, m4 of the last inclined upset face k, f of the third and fourth groups. An upset tool characterized in that it is long. 12. The angle of inclination of the last inclined upset face of the first, second and third group is 23 ° to 20 °, preferably 22.18 °, 23.63 ° and 20.56 °. The first or second beveled upset face is 8 ° to 12.1 °, preferably 8.13 °, 12.09 ° and 8.13 ° and the first beveled upset face of the last group is about 2.0 ° to 3.0 °, preferably Upset tool, characterized in that 2.29 °. 14. The upset tool according to any one of claims 11 to 13, characterized in that the inclined exit face g 'is connected to the parallel upset face g of the last group. 15. The upset tool according to claim 14, wherein the angle of inclination of the exit surface g 'is between about 12 degrees and 13 degrees, preferably 12.09. 14. A method of driving an upset tool of any one of claims 9 to 13 in a slab upset press, wherein the conveying device of the upset tool consists of two connecting rods, the connecting rod being two eccentric shafts. A method in which a piston-cylinder device is driven and pivotally connected to support and translate an upset tool, the connecting rod for generating an upset tool movement in synchronism with slab movement on a roller table. Sides SF1 and SF2 of the slab BR enter and then pass through the press spacing SP formed by the upset tools WZ1 and WZ2, so that the upset forming surface of the first group in the first upset stroke by (a, b, c) the next second upset stroke is by the second group of upset molding face (d, e, f) and the first group of upset molding face and by the second upset stroke And pressurized by the third group of upset molding surfaces (g, h, i, k) and the entire preceding two groups of upset molding surfaces. 17. The slab (BR) according to claim 16, wherein the slab (BR) is moved toward the press spacing defined by the upset tool, regardless of the position of the upset tool (WZ1, WZ2), fed at a pre-calculated feed rate and continued at the upset stroke. And the contacting step between the upset tools (WZ1, WZ2) and the slab (BR) is carried out synchronously. 17. The slab BR according to claim 16, wherein the slab BR is moved to a precomputed position with respect to the slab head between the upset tools WZ1 and WZ2 for initial upset shaping, and the subsequent upset stroke is carried out with each necessary forward speed and upset tool. Method that can occur with a variable stroke length in accordance with the synchronization of the speed.