Roller casting device with variable length

Abstract

This utility model belongs to the field of roll casting technology, specifically relating to a roll casting device with adjustable length. This device includes: a base, a bottom box, a multi-purpose cold mold, a riser, and a special core ring. The bottom box is fixedly connected to the top of the base. The multi-purpose cold mold is located on the top of the bottom box, and a riser is located on the top of the cold mold. Roll head casting cavities are provided inside both the riser and the bottom box. A roll body casting cavity is provided inside the multi-purpose cold mold. The special core ring is located at the bottom of the roll body casting cavity and is movably placed above the bottom box. The inner diameter of the special core ring is the same as the inner diameter of the roll head casting cavity inside the bottom box, and the outer wall of the special core ring fits against the inner wall of the multi-purpose cold mold. This roll casting device with adjustable length improves roll casting accuracy, extends equipment service life, and reduces production costs for various specifications.

Description

Technical Field

[0001] The utility model belongs to the technical field of roll casting, and particularly relates to a roll casting device with variable length. Background Art

[0002] Rolls are important parts on rolling mills in steel rolling mills. They are tools for plastic deformation of metals and important consumable parts that determine the efficiency of rolling mills and the quality of rolled materials. Nowadays, rolls are mainly formed by casting or forging methods.

[0003] After retrieval, a roll casting device with variable roll body length, application number <2017207>33715.7>, the casting device includes a pouring cup, a pouring pipe, a riser, a multi-purpose chill, a bottom box and a special core ring; the special core ring is located at the bottom of the roll body pouring cavity and is movably placed above the bottom box. The inner diameter of the special core ring is the same as the inner diameter of the roll head pouring cavity inside the bottom box, and the outer wall of the special core ring fits with the inner wall of the multi-purpose chill; the utility model achieves the purpose of producing roll bodies with different lengths by replacing special core rings with different heights in the roll body pouring cavity inside the multi-purpose chill, reduces the replacement of the multi-purpose chill, and at the same time reduces the investment in multiple specifications of the multi-purpose chill, greatly reducing the cost and bringing many conveniences to the production of rolls in factories.

[0004] The above patent realizes the change of roll body length through the adjustment of the height of the special core ring, but there are still the following technical bottlenecks: 1. The positioning accuracy is insufficient. The cooperation between the single-layer annular concave ring and the positioning convex ring is likely to cause the eccentricity deviation between the roll head and the roll body pouring cavity, leading to casting segregation;

[0005] 2. The sealing reliability is poor. The riser, the multi-purpose chill and the bottom box are simply movably connected, and the molten metal is likely to leak at high temperatures, and the risk of gas intrusion is high;

[0006] 3. Severe thermal erosion: The pouring cavity lacks a high-temperature resistant protective layer, and frequent casting results in a short equipment life and many surface defects of the castings. Therefore, we propose a roll casting device with variable length. Content of the Utility Model

[0007] The purpose of the utility model is to provide a roll casting device with variable length to solve the problems of casting segregation caused by the eccentricity deviation between the roll head and the roll body pouring cavity in the prior art, molten metal leakage and gas intrusion caused by insufficient high-temperature sealing, and short equipment life and surface defects of castings caused by thermal erosion of the pouring cavity, so as to achieve the purpose of improving the casting accuracy of rolls, extending the service life of equipment and reducing the production cost of multiple specifications.

[0008] ​To solve the above-mentioned technical problems, this utility model provides a roll casting device with adjustable length, including: a base, a bottom box, a multi-purpose cold mold, a riser, and a special core ring; the bottom box is fixedly connected to the top of the base, the multi-purpose cold mold is provided on the top of the bottom box, the riser is provided on the top of the multi-purpose cold mold, and a roll head pouring cavity is provided inside the riser and inside the bottom box. The roll body pouring cavity is provided inside the multi-purpose cold mold. The special core ring is located at the bottom of the roll body pouring cavity and is movably placed above the bottom box. The inner diameter of the special core ring is the same as the inner diameter of the roll head pouring cavity inside the bottom box, and the outer wall of the special core ring is in contact with the inner wall of the multi-purpose cold mold.

[0009] The inner wall surface of the multi-purpose cooling mold, the outer wall surface of the special core ring, and the inner wall surface of the bottom box roller casting cavity are all provided with a high-temperature resistant metal protective layer; the bottom of the bottom box is provided with a first annular concave ring, and the inner circumference of the first annular concave ring is provided with a second annular concave ring; the top of the multi-purpose cooling mold is provided with a first positioning convex ring, and the bottom of the special core ring is provided with a second positioning convex ring.

[0010] Flanges are provided between the riser and the multi-purpose cooling type, and between the multi-purpose cooling type and the bottom box.

[0011] Furthermore, a pouring pipe is provided on one side of the top of the base, and a pouring cup is provided on the top of the pouring pipe.

[0012] Furthermore, the casting pipe is connected to the roller casting cavity inside the bottom box.

[0013] Furthermore, the high-temperature resistant metal protective layer is composed of zirconia ceramic material or silicon carbide composite material.

[0014] Furthermore, both the riser and the bottom of the multi-purpose cold-type bottom flange are provided with multiple positioning grooves around their bottom.

[0015] Furthermore, the top of both the multi-purpose cold-type and the bottom box top flange are provided with multiple positioning protrusions.

[0016] Furthermore, each of the flange mating surfaces is provided with a graphite sealing ring, and the graphite sealing ring is provided with a pin hole that matches the positioning protrusion.

[0017] The beneficial effects of this utility model are:

[0018] 1. In this utility model, a multi-level nested positioning structure is formed by the first and second annular concave rings at the bottom of the bottom box, the first positioning convex ring at the top of the multi-purpose cold mold, and the second positioning convex ring at the bottom of the special core ring. This significantly improves the concentricity of the roller head and the roller body casting cavity and avoids the problem of uneven wall thickness caused by casting segregation. At the same time, the flange between the riser, the multi-purpose cold mold and the bottom box is combined with the graphite sealing ring pin hole matching design to achieve dynamic sealing at high temperature.

[0019] 2. This utility model covers the inner wall of the multi-purpose cold mold, the outer wall of the special core ring, and the inner wall of the bottom box roller casting cavity with a protective layer of zirconia ceramic or silicon carbide composite material, which effectively resists the high-temperature erosion of molten metal, reduces defects such as sand adhesion and cracks on the surface of castings, and extends the service life of equipment. It is especially suitable for high-frequency, multi-specification continuous casting scenarios.

[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the variable-length roll casting device of this utility model;

[0023] Figure 2 This is an exploded view of the flange of the variable-length roll casting device of this utility model.

[0024] Figure 3 This is a top view of the flange of this utility model.

[0025] In the diagram: 1. Base; 2. Base box; 201. First annular concave ring; 202. Second annular concave ring; 3. Multi-purpose cold-cast type; 301. First positioning convex ring; 302. Second positioning convex ring; 4. Riser; 5. Special core ring; 6. Roller head casting cavity; 7. Roller body casting cavity; 8. Casting pipe; 801. Casting cup; 9. High-temperature resistant metal protective layer; 10. Flange; 1102. Positioning groove; 1103. Positioning protrusion; 12. Graphite sealing ring; 1201. Pin hole. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] Example 1

[0028] like Figures 1 to 3 As shown, a roll casting device with adjustable length adjusts the position of a special core ring 5 on the base box 2 according to the target length of the roll, so that the second positioning convex ring 302 is embedded into the second annular concave ring 202 of the base box 2. The multi-purpose cold mold 3 is nested into the first annular concave ring 201 of the base box 2 through the first positioning convex ring 301. The riser 4 is connected to the top of the multi-purpose cold mold 3 through the flange 10. The graphite sealing ring 12 between the flanges 10 is locked to the positioning protrusion 1103 through the pin hole 1201, thus completing the casting of the roll head, roll body and riser 4. The sealing assembly of the injection cavity allows molten metal to be injected from the pouring cup 801 through the pouring pipe 8 into the bottom box 2 roller head injection cavity 6. The liquid level rises to the roller body injection cavity 7 and fills the axial space defined by the special core ring 5. Finally, it enters the riser 4 for feeding. After solidification, the flange 10 is removed, the riser 4 and the multi-purpose cold mold 3 are removed, and the special core ring 5 can be adjusted or replaced to quickly adapt to the next specification of roll casting. By changing the height of the special core ring 5, the length of the roller body injection cavity 7 can be directly controlled. Combined with the thermal shock resistance of the high temperature protective layer, multi-specification switching in continuous production can be achieved.

[0029] Example 2

[0030] like Figures 1 to 3 As shown, the special core ring 5 is matched with the multi-purpose cold mold 3 and the bottom box 2: the movable special core ring 5 achieves flexible adjustment of the axial height of the roller body casting cavity 7 through the structure that the outer wall of the special core ring 5 fits the inner wall of the multi-purpose cold mold 3 and the inner diameter is consistent with the roller head casting cavity 6 of the bottom box 2, thereby adapting to the casting requirements of rolls of different lengths.

[0031] Annular concave ring and positioning convex ring: The first and second annular concave rings 202 at the bottom of the bottom box 2, together with the first positioning convex ring 301 at the top of the multi-purpose cold mold 3 and the second positioning convex ring 302 at the bottom of the special core ring 5, form a nested positioning structure to ensure the concentricity of the roller head and the roller body casting cavity 7 and prevent casting segregation.

[0032] Flange 10 and graphite sealing ring 12: The flange 10 between riser 4, multi-purpose cold type 3 and bottom box 2 is mechanically interlocked with positioning groove 1102 and positioning protrusion 1103, combined with the pin hole 1201 of graphite sealing ring 12 to achieve dynamic sealing at high temperature and suppress metal liquid leakage and gas intrusion.

[0033] High-temperature resistant metal protective layer 9: Zirconia ceramic or silicon carbide composite material covers the contact surface of the roller head and the roller body casting cavity 7 to resist high-temperature erosion of molten metal and reduce sand adhesion and hot crack defects on the surface of the casting;

[0034] The pouring pipe 8 and the pouring cup 801: The side pouring pipe 8 of the bottom box 2 is connected to the roller head pouring cavity 6, and together with the top pouring cup 801, it guides the molten metal to fill the mold from bottom to top in a directional manner, optimizes the solidification sequence and reduces porosity inclusions.

[0035] In summary, the length of the roll body casting cavity 7 can be directly controlled by adjusting the height of the special core ring 5 without replacing the core equipment. This supports rapid switching between different sizes of rolls, from short to long, meeting the needs of small-batch, diversified production. Replacing or adjusting the special core ring 5 after disassembling the flange 10 allows for adaptation to new specifications, significantly reducing downtime and improving production line continuity. The nested structure of the bottom box 2, the multi-purpose cold mold 3, and the special core ring 5, along with the annular concave ring and the positioning convex ring, ensures strict concentricity between the roll head and the roll body casting cavity 7, avoiding casting segregation and uneven wall thickness. The molten metal fills the mold from bottom to top through the pouring pipe 8 from the side of the bottom box 2, with feeding from the top riser 4, reducing oxide inclusions and porosity. The design incorporates features such as a groove to improve the internal density and mechanical properties of the casting; a positioning design between the graphite sealing ring 12 and pin hole 1201 between the flanges 10 maintains a tight seal at high temperatures, preventing molten metal leakage and gas intrusion, thus reducing scrap rate; a high-temperature resistant protective layer with zirconia ceramic or silicon carbide coating resists molten metal corrosion, reduces sand adhesion and cracks on the casting surface, and extends equipment service life; the adjustability of the specially designed core ring 5, combined with the thermal shock resistance of the high-temperature protective layer, supports continuous casting of multiple specifications of rolls without the need for frequent cooling equipment, improving production efficiency; and the precise fit between the positioning groove 1102 and the protrusion of the flange 10 simplifies the assembly process, reduces human error, and improves assembly efficiency.

[0036] All the devices selected in this application are general standard parts or components known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0037] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A roll casting apparatus with adjustable length, characterized in that, include: The base (1), the bottom box (2), the multi-purpose cooling mold (3), the riser (4), and the special core ring (5) are fixedly connected to the top of the base (1). The bottom box (2) is provided on the top of the bottom box (2). The riser (4) is provided on the top of the multi-purpose cooling mold (3). The riser (4) and the bottom box (2) are both provided with roller head casting cavities (6). The roller body casting cavity (7) is provided inside the multi-purpose cooling mold (3). The special core ring (5) is located at the bottom of the roller body casting cavity (7) and is movably placed above the bottom box (2). The inner diameter of the special core ring (5) is the same as the inner diameter of the roller head casting cavity (6) inside the bottom box (2). The outer wall of the special core ring (5) is in contact with the inner wall of the multi-purpose cooling mold (3). The inner wall surface of the multi-purpose cooling type (3), the outer wall surface of the special core ring (5), and the inner wall surface of the roller head casting cavity (6) of the bottom box (2) are all provided with a high-temperature resistant metal protective layer (9); the bottom of the bottom box (2) is provided with a first annular concave ring (201), the inner circumference of the first annular concave ring (201) is provided with a second annular concave ring (202), the top of the multi-purpose cooling type (3) is provided with a first positioning protrusion (301), and the bottom of the special core ring (5) is provided with a second positioning protrusion (302); Flanges (10) are provided between the riser (4) and the multi-purpose refrigeration type (3), and between the multi-purpose refrigeration type (3) and the bottom box (2).

2. The variable-length roll casting apparatus as described in claim 1, characterized in that, A pouring pipe (8) is provided on one side of the top of the base (1), and a pouring cup (801) is provided on the top of the pouring pipe (8).

3. The variable-length roll casting apparatus as described in claim 2, characterized in that, The casting pipe (8) is connected to the roller casting cavity (6) inside the bottom box (2).

4. The variable-length roll casting apparatus as described in claim 1, characterized in that, The high-temperature resistant metal protective layer (9) is composed of zirconia ceramic material or silicon carbide composite material.

5. The variable-length roll casting apparatus as described in claim 1, characterized in that, The bottom of both the riser (4) and the bottom flange (10) of the multi-purpose cold type (3) are provided with multiple positioning grooves (1102).

6. The variable-length roll casting apparatus as described in claim 5, characterized in that, The top flange (10) of both the multi-purpose cooling type (3) and the bottom box (2) is provided with multiple positioning protrusions (1103).

7. The variable-length roll casting apparatus as described in claim 6, characterized in that, Each flange (10) mating surface is provided with a graphite sealing ring (12), and the graphite sealing ring (12) is provided with a pin hole (1201) that matches the positioning protrusion (1103).

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