Casting device of rolling mill stand and rolling mill stand
By designing the mold cavity to be consistent with the rolling mill frame structure, combined with the chill array and riser structure, the problems of bubbles and cracks in the rolling mill frame casting process were solved, achieving a higher quality solidification effect.
Patent Information
- Application Number
- CN202422065971.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2034-08-23
AI Technical Summary
During the casting process, defects such as bubbles and cracks are easily generated inside the column structure of the rolling mill frame, affecting the quality.
A mold casting device is used, the inner cavity of the mold is consistent with the rolling mill frame structure, and a crossbeam and column structure is set. There are multiple chillers on the surfaces of both sides of the column. The chillers are arranged in an array to promote the solidification of molten steel and increase the heat dissipation area. The volume shrinkage is compensated by the riser structure and the number of risers is reduced.
The solidification quality and integrity of the rolling mill stand are improved, the air bubble and crack defects are reduced, and the casting effect is improved.
Smart Images
Figure CN223394253U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of casting devices, in particular to a casting device of a rolling mill frame and the rolling mill frame. Background Art
[0002] The rolling mill stand is one of the main components of rolling equipment, responsible for supporting the rolling rollers and transmitting pressure. It also needs to have high strength and stability. The rolling mill stand is usually cast from carbon steel or low-alloy steel. During the casting process, due to the excessive length of the columns between the two crossbeams of the rolling mill stand, the molten steel is prone to produce defects such as bubbles and cracks inside the column structure during the solidification process, affecting the quality of the rolling mill stand. Utility Model Content
[0003] The problem to be solved by the utility model is how to improve the quality of the rolling mill frame after casting and solidification.
[0004] To this end, the present invention provides a casting device for a rolling mill frame, comprising a mold, wherein the mold is used to load molten steel, the inner cavity shape of the mold is consistent with the rolling mill frame structure, the mold comprises a beam structure and a column structure, a riser structure is extended on the upper surface of the beam structure, and a plurality of second chills and a plurality of third chills are provided on any opposite side surfaces of the column structure, the second chills and the third chills have the same surface area in contact with the column structure, a plurality of second chills are arrayed in the middle of the surface of the column structure, and a plurality of third chills are respectively arrayed on both sides of the plurality of second chills along the length direction of the column structure, the width of the plurality of third chills is smaller than the width of the second chill, and the width of the plurality of third chills gradually decreases from the direction close to the second chill to the direction away from the second chill.
[0005] Optionally, a first chill is further provided in the middle of at least one side surface of the column structure, and the first chill and the second chill are located on different surfaces of the column structure.
[0006] Optionally, the first chill is arranged in the middle of the lower surface of the column structure, and the thickness of the first chill is greater than or equal to the thickness of the column structure.
[0007] Optionally, the maximum length of the projections of the first chill, the second chill, and the third chill in the length direction of the column structure is one half to one third of the length of the column structure.
[0008] Optionally, a plurality of the second chillers are respectively arranged on both side surfaces of the column structure along the width direction, and the width of the second chiller is greater than or equal to one quarter of the width of the column structure.
[0009] Optionally, the inner cavity volume of the riser structure is larger than the inner cavity volume of the beam structure.
[0010] Optionally, the riser structure is made of thermal insulation material.
[0011] Optionally, the distance between adjacent second chills and third chills is 95 to 105 mm.
[0012] Optionally, the width of the third chill is one half to one quarter of the width of the second chill.
[0013] Compared with the prior art, the beneficial effects of the casting device of the rolling mill stand of the utility model are:
[0014] The utility model provides a mold, and molten steel is injected into the mold from a riser structure, cooled and solidified into a rolling mill frame. The shape of the inner cavity of the mold is the same as the structure of the rolling mill frame. The mold includes two beam structures located at both ends of the mold in the X-axis direction and two column structures located at both ends of the mold in the Y-axis direction. The molten steel loaded in the inner cavity of the beam structure solidifies into the beam of the rolling mill frame, and the molten steel loaded in the inner cavity of the column structure solidifies into the column of the rolling mill frame. Any column structure is provided with a plurality of second chills and a plurality of third chills on both sides along the width direction, i.e., the Y-axis direction, or along the thickness direction, i.e., the Z-axis direction. The chills have a chilling effect, which can promote nucleation, i.e., absorb the heat of the molten steel, so that the molten steel The crystal nucleus is solidified first inside, thereby promoting the solidification of the molten steel, and at the same time increasing the heat dissipation area of the mold, so that the molten steel adjacent to the chill is cooled faster and is cooled and solidified first. The second chill and the third chill are both cubic structures, wherein multiple second chills are arranged in an array and connected to the middle of the surface of the column structure. On the surface of the column structure, multiple third chills are arranged in an array on both sides along the length direction of the second chill, that is, along the X-axis direction. The shape of the area where the second chill contacts the column structure is the same as the shape of the area where the third chill contacts the surface of the column structure. This arrangement allows the heat of the molten steel in the column structure to be evenly transferred to multiple chills. The width of the multiple third chills (that is, along the Y The dimension in the axial direction) is smaller than the width of the second chill, and the widths of the plurality of third chills gradually decrease from the direction close to the second chill to the direction away from the second chill. With this arrangement, the chilling effect of the chill gradually decreases from the middle of the column structure to the two ends of the column structure along the X-axis. After the molten steel is poured into the mold, the molten steel begins to solidify in sequence from the middle of the column structure to the two ends of the column structure along the X-axis, and finally solidifies the molten steel in the crossbeam and the molten steel in the riser. Solidifying in sequence can make the structure denser after solidification. A riser structure is also extended on the upper surface of the crossbeam structure. The liquid molten steel in the column structure solidifies into a solid state, which will cause volume shrinkage. The molten steel in the riser structure will shrink under the action of gravity. The shrinkage volume is supplemented by the downstream crossbeam structure, which has a shrinkage compensation effect, ensuring the integrity of the crossbeam and column structures of the rolling mill frame and improving the quality of the rolling mill frame. Since the second chiller and the third chiller are arranged on the surface of the column structure, the molten steel will begin to solidify from the middle of the column structure to both ends, and the structure after solidification will shrink from both ends of the column structure to the middle. Therefore, the molten steel used to supplement the shrinkage volume is supplemented from both ends of the column structure through the riser structure on the crossbeam structure, which can also ensure the integrity of the column obtained by the final solidification. Therefore, it is only necessary to arrange the riser structure on the surface of the beam structure, and there is no need to arrange the riser structure on the surface of the column structure, which can reduce the number of riser structures.
[0015] In addition, in order to solve the above problems, the present invention also provides a rolling mill frame, which is made based on the above-mentioned casting device of the rolling mill frame.
[0016] Compared with the prior art, the beneficial effects of the rolling mill stand described in the present invention are substantially the same as the beneficial effects of the casting device of the above-mentioned rolling mill stand, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is one of the structural schematic diagrams of the casting device of the rolling mill stand according to an embodiment of the present utility model;
[0018] Figure 2 This is the second structural schematic diagram of the casting device of the rolling mill frame described in the embodiment of the present utility model.
[0019] Description of reference numerals:
[0020] 1-column structure; 2-beam structure; 3-riser structure; 4-first chill; 5-second chill; 6-third chill. DETAILED DESCRIPTION
[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.
[0022] It should be noted that in the description of the present invention, the directions or positional relationships indicated by “up”, “down”, “left”, “right”, “top”, “bottom”, “front”, “back”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, it cannot be understood as limiting the scope of protection of the present invention.
[0023] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.
[0024] Furthermore, although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It should be understood that numerous modifications may be made to the illustrative embodiments, and that other arrangements may be devised, without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described herein may be combined in ways not described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other embodiments.
[0025] The rolling mill frame is usually cast from carbon steel or low alloy steel, and its internal quality requirements are strict. After rough machining, the entire frame is required to undergo ultrasonic testing to meet the SN320-10 standard. The rolling mill frame usually consists of two crossbeams and two columns connected between the two crossbeams. These parts need to be cast in one piece. Due to the thermal conductivity of the casting, risers are usually set on the parts of the casting mold of the rolling mill frame corresponding to each crossbeam and column. Figure 1 As shown,
[0026] During the solidification process of the cast molten steel, the volume will shrink due to the change from liquid to solid. The molten steel in the riser can make up for the volume of the columns and beams that shrink during the solidification process. However, during the casting process, since the columns between the two beams of the rolling mill frame are too long, the molten steel is prone to produce defects such as bubbles and cracks inside the columns during the solidification process, affecting the quality of the rolling mill frame.
[0027] To solve the above problems, Figure 1 As shown, the utility model provides a casting device for a rolling mill frame, including a mold, which is used to load molten steel. The inner cavity shape of the mold is consistent with the rolling mill frame structure. The mold includes a beam structure 2 and a column structure 1. A riser structure 3 is extended on the upper surface of the beam structure 2. A plurality of second chills 5 and a plurality of third chills 6 are provided on any opposite side surfaces of the column structure 1. The second chills 5 and the third chills 6 have the same surface area in contact with the column structure 1. The plurality of second chills 5 are arranged in an array in the middle of the surface of the column structure 1. The plurality of third chills 6 are respectively arranged in an array on both sides of the plurality of second chills 5 along the length direction of the column structure 1. The width of the plurality of third chills 6 is smaller than the width of the second chill 5, and the width of the plurality of third chills 6 gradually decreases from the direction close to the second chill 5 to the direction away from the second chill 5.
[0028] It should be noted that, whether it is the first chill 4, the second chill 5 or the third chill 6, the length refers to the dimension along the X-axis direction in the accompanying drawings, the width refers to the dimension along the Y-axis direction in the accompanying drawings, and the thickness refers to the dimension along the Z-axis direction in the accompanying drawings; the lengths of the beam structure 2 and the column structure 1 refer to their respective extension directions, which are different, while the thicknesses of the beam structure 2 and the column structure 1 refer to the dimension along the Z-axis direction in the accompanying drawings.
[0029] In this embodiment, by setting a mold, molten steel is injected into the mold from the riser structure 3, cooled and solidified into a rolling mill frame, the shape of the mold cavity is the same as the structure of the rolling mill frame, the mold includes two beam structures 2 located at both ends of the mold in the X-axis direction and two column structures 1 located at both ends of the mold in the Y-axis direction, the molten steel loaded in the inner cavity of the beam structure 2 solidifies into the beam of the rolling mill frame, and the molten steel loaded in the inner cavity of the column structure 1 solidifies into the column of the rolling mill frame, any column structure 1 is provided with a plurality of second chills 5 and a plurality of third chills 6 on both sides along the width direction, i.e., the Y-axis direction, or along the thickness direction, i.e., the Z-axis direction. The chill has a chilling effect, which can promote nucleation, that is, absorb the heat of the molten steel, so that the inside of the molten steel The crystal nuclei are solidified first, thereby promoting the solidification of the molten steel, and at the same time increasing the heat dissipation area of the mold, so that the molten steel adjacent to the cold iron is cooled faster and cooled down and solidified first. The second cold iron 5 and the third cold iron 6 are both cubic structures, wherein multiple second cold irons 5 are arranged in an array and connected to the middle of the surface of the column structure 1. On the surface of the column structure 1, multiple third cold irons 6 are arranged in an array along the length direction of the second cold iron 5, that is, along the X-axis direction. The shape of the area where the second cold iron 5 contacts the column structure 1 is the same as the shape of the area where the third cold iron 6 contacts the surface of the column structure 1. This arrangement can evenly transfer the heat of the molten steel in the column structure 1 to multiple cold irons. The width of multiple third cold irons 6 (that is, along the Y-axis The dimension in the direction) is smaller than the width of the second chill 5, and the width of the plurality of third chills 6 gradually decreases from the direction close to the second chill 5 to the direction away from the second chill 5. With this arrangement, the chilling effect of the chill gradually decreases from the middle of the column structure 1 to the two ends of the column structure 1 along the X-axis direction. After the molten steel is poured into the mold, the molten steel begins to solidify in sequence from the middle of the column structure 1 to the two ends of the column structure 1 along the X-axis direction, and finally solidifies the molten steel in the beam and the molten steel in the riser. Solidifying in sequence can make the structure denser after solidification. A riser structure 3 is also extended on the upper surface of the beam structure 2. The liquid molten steel in the column structure 1 solidifies into a solid state, which will cause volume shrinkage. The molten steel in the riser structure 3 will shrink under the action of gravity. The downstream cross-beam structure 2 supplements the shrunken volume, that is, it has a shrinkage compensation effect, ensures the integrity of the cross-beam and column structures of the rolling mill frame, and improves the quality of the rolling mill frame. Since the second chill 5 and the third chill 6 are arranged on the surface of the column structure 1, the molten steel will begin to solidify from the middle of the column structure 1 to both ends, and the structure after solidification shrinks from the two ends of the column structure 1 to the middle. Therefore, the molten steel used to compensate for the shrinkage volume is supplemented from both ends of the column structure 1 through the riser structure 3 on the cross-beam structure 2, which can also ensure the integrity of the column obtained by the final solidification. Therefore, it is only necessary to arrange the riser structure 3 on the surface of the cross-beam structure 2, and there is no need to arrange the riser structure 3 on the surface of the column structure, which can reduce the number of riser structures 3.
[0030] Specifically, when multiple second chills 5 and multiple third chills 6 are located on the surface of the column structure 1 along the positive and negative directions of the Y-axis, the dimensions of the multiple third chills in the Y-axis direction gradually decrease from close to the second chill to away from the second chill; when multiple second chills 5 and multiple third chills 6 are located on the surface of the column structure 1 along the positive and negative directions of the Z-axis, the dimensions of the multiple third chills in the Z-axis direction gradually decrease from close to the second chill to away from the second chill.
[0031] Alternatively, as Figure 1 and Figure 2 As shown, a first chiller 4 is further provided in the middle of at least one side surface of the column structure 1 , and the first chiller 4 and the second chiller 5 are located on different surfaces of the column structure 1 .
[0032] In this embodiment, the first chill 4 is arranged in the middle of at least one surface of the column structure 1 where the second chill 5 is not arranged. For example, when the second chill 5 is arranged on the two side surfaces of the column structure 1 along the Y-axis direction, the first chill 4 is arranged on the surface of the column structure 1 along the Z-axis direction; when the second chill 5 is arranged on the two side surfaces of the column structure 1 along the Z-axis direction, the first chill 4 is arranged on the surface of the column structure 1 along the Y-axis direction. The first chill 4 can be used in combination with the second chill 5 and the third chill 6 to accelerate the solidification speed of the molten steel, so that the molten steel solidifies in sequence from the middle to the two ends of the column structure 1.
[0033] Alternatively, as Figure 2 As shown, the first chill 4 is arranged in the middle of the lower surface of the column structure 1 , and the thickness of the first chill 4 is greater than or equal to the thickness of the column structure 1 .
[0034] In this embodiment, by arranging the first chill 4 on the lower surface of the column structure 1, that is, the surface in the negative direction of the Z axis, the second chill 5 and the third chill 6 are provided on both side surfaces of the column structure 1 along the Y axis. The thickness of the first chill 4, that is, the dimension in the Z axis direction is greater than or equal to the dimension of the column structure 1 in the Z axis direction, can ensure that the quenching effect of the first chill 4 can make the molten steel in a section of the column structure 1 that is in contact with the first chill 4 completely solidify first, and ensure that the molten steel solidifies in sequence from the middle to both ends of the column structure 1.
[0035] Specifically, the size of the first chill 4 in the X-axis direction is less than or equal to 1.5 times the size of the column structure 1 in the Z-axis direction, so as to avoid the first chill 4 being too large in the X-axis direction, cutting off the shrinkage feeding channel, and affecting the flow of molten steel in the column structure 1 during the shrinkage feeding process. The size of the first chill 4 in the Y-axis direction is greater than or equal to the size of the column in the Y-axis direction, so that the first chill 4 can completely cover the surface of the column structure 1 abutting it, thereby improving the solidification effect and making the column denser.
[0036] Alternatively, as Figure 1 and Figure 2 As shown, the maximum length of the projections of the first chill 4 , the second chill 5 and the third chill 6 in the length direction of the column structure 1 is one half to one third of the length of the column structure 1 .
[0037] In this embodiment, the maximum length of the projection of the first chill 4, the second chill 5 and the third chill 6 in the X-axis direction is calculated by referring to Figure 2 L in the figure is set to be between one-half and one-third of the length of the column structure 1, that is, the dimension in the X-axis direction, to ensure that the chilling effect produced by the chiller will not directly affect the shrinkage feeding effect of the molten steel in the beam structure 2 and the riser structure 3. The chilling effect of the chiller first solidifies the molten steel in the middle of the column structure 1, and then solidifies the molten steel at both ends of the column structure 1, the beam structure 2 and the riser structure 3 in turn.
[0038] Alternatively, as Figure 1 As shown, a plurality of second chillers 5 are respectively arranged on both side surfaces of the column structure 1 along the width direction, and the width of the second chiller 5 is greater than or equal to one quarter of the width of the column structure 1 .
[0039] In this embodiment, by arranging the second chill 5 on both side surfaces of the column structure 1 along the Y-axis direction, and setting the width of the second chill 5, that is, the dimension along the Y-axis direction, to be greater than or equal to one-fourth of the dimension of the column along the Y-axis direction, the insufficient width of the second chill 5 is avoided, and the chilling effect produced by it cannot affect the molten steel at the center position of the column structure 1 along the Y-axis direction, thereby ensuring that the width of the second chill 5 can allow the molten steel to solidify in sequence from the middle to the two ends of the column structure 1.
[0040] Optionally, the inner volume of the riser structure 3 is larger than the inner volume of the beam structure 2 .
[0041] In this embodiment, by setting the inner cavity volume of the riser structure 3 to be larger than the inner cavity volume of the beam structure 2, it is ensured that there is sufficient molten steel in the riser structure 3, and the volume of the molten steel that shrinks due to solidification can be fully replenished.
[0042] Optionally, the riser structure 3 is made of thermal insulation material.
[0043] In this embodiment, by making the riser structure 3 of insulation material, such as refractory fiber, silicate, etc., the insulation material can delay the solidification time of the molten steel in the riser structure 3, avoiding the situation where the molten steel in the riser structure 3 cannot fill the shrinkage volume of the molten steel.
[0044] Optionally, the distance between adjacent second chills 5 and third chills 6 is 95 to 105 mm.
[0045] In this embodiment, by setting the distance between the adjacent second chill 5 and the third chill 6 to between 95 mm and 105 mm, preferably 100 mm, on the one hand, it is avoided that the chills are too far apart, resulting in the appearance of scattered isolated heat nodes inside the column structure 1, that is, the molten steel at the location where the chill is located solidifies quickly and solidifies first, and the molten steel at the location between the two chills cools too slowly, and the fast-cooling area surrounds the slow-cooling area. When the volume of the slow-cooling area shrinks, the riser cannot be compensated, that is, a small heat node is formed in the slow-compensated area. If the small heat node cannot be compensated, shrinkage cavities and shrinkage defects will be formed. On the other hand, it also avoids the chills being too close, resulting in the molten steel in the column area corresponding to the chill solidifying at the same time, which is prone to cracks and faults.
[0046] Optionally, the width of the third chill 6 is one half to one quarter of the width of the second chill 5 .
[0047] In this embodiment, by setting the width of the third chill 6, that is, the dimension in the Y-axis direction, to the width of the second chill 5, that is, one-half to one-quarter of the dimension in the Y-axis direction, it is ensured that the dimension of the third chill 6 in the Y-axis direction gradually decreases from close to the second chill 5 to far away from the second chill 5, so that the solidification rate of the molten steel from the middle to the two ends of the column structure 1 is significantly reduced, so that the molten steel solidifies in sequence from the middle to the two ends of the column structure 1.
[0048] A rolling mill frame according to another embodiment of the present invention is manufactured based on the above-mentioned casting device for the rolling mill frame.
[0049] Compared with the prior art, the beneficial effects of the rolling mill stand of this embodiment are substantially the same as the beneficial effects of the casting device of the rolling mill stand described above, and will not be described in detail here.
[0050] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.
Claims
1. A casting device for a rolling mill stand, characterized in that: The invention comprises a mold, wherein the mold is used for loading molten steel, the inner cavity shape of the mold is consistent with the rolling mill frame structure, the mold comprises a crossbeam structure (2) and a column structure (1), the upper surface of the crossbeam structure (2) is provided with a riser structure (3), and any two opposite side surfaces of the column structure (1) are provided with a plurality of second cold irons (5) and a plurality of third cold irons (6), the second cold irons (5) and the third cold irons (6) have the same surface area in contact with the column structure (1), the plurality of second cold irons (5) are arranged in an array in the middle of the surface of the column structure (1), the plurality of third cold irons (6) are respectively arranged in an array on both sides of the plurality of second cold irons (5) along the length direction of the column structure (1), the width of the plurality of third cold irons (6) is smaller than the width of the second cold iron (5), and the width of the plurality of third cold irons (6) gradually decreases from the direction close to the second cold iron (5) to the direction away from the second cold iron (5).
2. The casting device for a rolling mill stand according to claim 1, characterized in that A first cold iron (4) is also provided in the middle of at least one side surface of the column structure (1), and the first cold iron (4) and the second cold iron (5) are located on different surfaces of the column structure (1).
3. The casting device for a rolling mill stand according to claim 2, characterized in that: The first cold iron (4) is arranged in the middle of the lower surface of the column structure (1), and the thickness of the first cold iron (4) is greater than or equal to the thickness of the column structure (1).
4. The casting device for a rolling mill stand according to claim 2, characterized in that: The maximum length of the projections of the first cold iron (4), the second cold iron (5) and the third cold iron (6) in the length direction of the column structure (1) is one half to one third of the length of the column structure (1).
5. The casting device for a rolling mill stand according to claim 1, characterized in that: A plurality of the second cold irons (5) are respectively arranged on the two side surfaces of the column structure (1) along the width direction, and the width of the second cold irons (5) is greater than or equal to one quarter of the width of the column structure (1).
6. The casting device for a rolling mill stand according to claim 1, characterized in that: The inner cavity volume of the riser structure (3) is greater than the inner cavity volume of the beam structure (2).
7. The casting device for a rolling mill stand according to claim 1, characterized in that: The riser structure (3) is made of heat-insulating material.
8. The casting device for a rolling mill stand according to claim 1, characterized in that: The distance between the adjacent second chills (5) and the adjacent third chills (6) is 95 to 105 mm.
9. The casting device for a rolling mill stand according to claim 1, characterized in that: The width of the third cold iron (6) is one half to one quarter of the width of the second cold iron (5).
10. A rolling mill stand, characterized in that: The casting device of the rolling mill stand is manufactured based on any one of claims 1 to 9.