Heat treatment tool for batch heat treatment of steel rods having ultra-large length-diameter ratio

Abstract

A heat treatment tool for batch heat treatment of steel rods having an ultra-large length-diameter ratio. The heat treatment tool is a suspension tool using a disc-shaped suspension disc (1) and a suspension rod (2) penetrating the center of the suspension disc (1). The suspension disc (1) is provided with a plurality of suspension holes (14) used for suspending steel rods. The heat treatment tool can vertically suspend steel rods having an ultra-large length-diameter ratio, can stably suspend the steel rods at a high-temperature state during heat treatment, and can also achieve the effects of hoisting and transferring steel rods during water hardening. Therefore, the heat treatment tool can achieve batch heat treatment of steel rods having an ultra-large length-diameter ratio, is convenient to operate and enables good shape control for steel rods.

Description

Heat treatment tooling for batch heat treatment of steel bars with ultra-large aspect ratio Technical Field

[0001] The invention relates to the technical field of forging manufacturing and processing, and in particular to a heat treatment tool used for batch heat treatment of steel bars with an ultra-large aspect ratio. Background Art

[0002] With the rapid development of my country's heavy equipment manufacturing industry, forgings for many large-scale equipment are facing higher requirements for shape and material properties. In particular, some test equipment places unprecedented demands on material quality uniformity and shape stability. For example, the typical fourth-generation nuclear power 600MW demonstration fast reactor project utilizes a large number of austenitic stainless steel bars of various specifications in its main equipment structures. Many of these bars are long and small in diameter, making them slender, large forgings.

[0003] Super-large aspect ratio steel bars refer to steel bars with a length to diameter ratio of 30:1 or more. Super-large aspect ratio steel bars have problems such as difficult deformation control, large quenching deformation, and low quenching efficiency. At present, domestic quenching water cooling for super-large aspect ratio steel bars mostly adopts horizontal immersion or vertical immersion methods. The horizontal immersion method is generally used for loading and lifting by pallets, and multiple steel bars can be processed at one time, but the disadvantage is that deformation cannot be controlled and the deformation is large. The vertical immersion method is generally used for loading and lifting by hanging plates, which can effectively control deformation such as bending or twisting of steel bars, but the disadvantage is that the number of bars loaded at a time is limited, generally ≤6, and each steel bar needs to be equipped with a hanging plate + cross pin. The loading process is complicated, many tooling are required, and production efficiency is low.

[0004] Summary of the Invention

[0005] The purpose of the present invention is to solve the problem in the prior art that it is difficult to simultaneously process large quantities of steel bars with an extremely large aspect ratio while effectively controlling deformation such as bending or twisting of the steel bars during quenching and water cooling. In order to solve the above problem, the present invention provides a heat treatment tool for batch heat treatment of steel bars with an extremely large aspect ratio, which adopts a hanging tool with a disc-shaped hanging plate and a hanging rod passing through the center of the hanging plate. The hanging plate is provided with a plurality of hanging holes for hanging steel bars, which can be used to hang steel bars with an extremely large aspect ratio upright, and stably hang the steel bars during high-temperature heat treatment, while taking into account the functions of lifting and transferring the steel bars during water-cooling quenching. Batch heat treatment of steel bars with an extremely large aspect ratio can be achieved, the operation is convenient, and the shape control of the steel bars is good.

[0006] An embodiment of the present invention provides a heat treatment tool for batch heat treatment of steel bars with an ultra-large aspect ratio, comprising a suspension plate and a suspension rod detachably connected to the center of the suspension plate;

[0007] The suspension plate is arranged in a disc shape, and a center hole is arranged in the center of the suspension plate;

[0008] The suspension rod is arranged through the central hole, and the suspension rod is arranged vertically relative to the suspension plate;

[0009] The suspension plate has a plurality of suspension areas evenly distributed circumferentially around the central hole, and each of the suspension areas is provided with a plurality of hanging holes, and the hanging holes are used to hang the ends of the steel rods;

[0010] A plurality of hanging areas are sequentially distributed in the hanging area from the central hole to the edge of the hanging plate; at least one hanging hole is provided in the hanging area, and the number of the hanging holes in different hanging areas is different.

[0011] By adopting the above technical solution, the suspension plate is arranged in a disc shape, and the suspension rod passes through the center hole in the center of the suspension plate and is arranged perpendicular to the suspension plate, so that the suspension plate can be lifted horizontally by the suspension rod; further, the suspension plate has multiple suspension areas evenly distributed circumferentially around the center hole, and each suspension area is provided with multiple hanging holes for hanging steel rods; thereby, multiple steel rods can be evenly distributed around the center hole of the suspension plate along the circumference of the suspension plate; the center of gravity of the multiple steel rods is located on the axis of the center hole (or it can be understood that the center of gravity of the multiple steel rods is located on the axis of the suspension rod), so that the suspension rod only needs to be lifted by a sling, which can ensure that the suspension plate can stably suspend multiple steel rods and realize batch heat treatment of steel rods with ultra-large aspect ratio.

[0012] In some embodiments, first reinforcing ribs are provided between adjacent suspension areas in the suspension plate, and different suspension areas are separated by the first reinforcing ribs;

[0013] A second reinforcing rib is arranged around the edge of the suspension plate.

[0014] By adopting the above technical solution, on the one hand, the suspension plate is divided into different suspension areas by the first reinforcement rib, so that different suspension areas can be independently assembled with ultra-large aspect ratio steel rods, thereby improving the assembly rate of steel rods; on the other hand, the setting of the first reinforcement rib and the second reinforcement rib greatly enhances the structural strength of the suspension plate, thereby ensuring that the suspension plate can stably suspend multiple steel rods in a high temperature state.

[0015] In some embodiments, four first reinforcing ribs are provided, and the four first reinforcing ribs evenly divide the suspension plate into four suspension areas.

[0016] In some embodiments, in the plurality of hanging areas sequentially distributed within the suspension area, the number of hanging holes arranged in each hanging area gradually increases according to the order of sequential distribution.

[0017] By adopting the above technical solution, since the distribution order and position of multiple hanging areas in each suspension area are the same, the steel rods can be hung in the corresponding hanging areas in different suspension areas. Therefore, when the suspension plate is not full of steel rods, it can be ensured that when steel rods are installed in different suspension areas at the same time, it is only necessary to ensure that the hanging holes in the same hanging area in different suspension areas are full of steel rods, that is, it can be ensured that after the installation of multiple steel rods, their center of gravity is still located on the axis of the center hole of the suspension plate, thereby ensuring that the suspension plate can stably suspend multiple steel rods and realize batch heat treatment of steel rods with ultra-large aspect ratio.

[0018] In some embodiments, the suspension area includes a first hanging area, a second hanging area, and a third hanging area.

[0019] The first hanging area is arranged close to the central hole and is provided with a hanging hole;

[0020] The third hanging area is arranged close to the edge of the suspension plate and is provided with three hanging holes;

[0021] The second hanging area is located between the first hanging area and the third hanging area and is provided with two hanging holes.

[0022] By adopting the above technical solution, any number of steel bars from 1 to 6 can be hung in the same hanging area, and any number of steel bars from 1 to 6 can be fully distributed in the first hanging area, the second hanging area and / or the third hanging area; that is, when any number of steel bars from 1 to 6 are hung, it can be ensured that no hanging area is not fully filled with steel bars.

[0023] In some embodiments, the plurality of hanging holes in each hanging area are evenly distributed circumferentially around the central hole.

[0024] In some embodiments, one end of the suspension rod is provided with a flange for supporting the suspension plate, and the other end passes through the center hole and is provided with a suspension hole for connecting to a sling.

[0025] In some embodiments, the center distance between different hanging holes is ≥2.5d, where d is the diameter of the hanging hole.

[0026] Other features and corresponding beneficial effects of the present invention are described in the latter part of the specification, and it should be understood that at least some of the beneficial effects become obvious from the description in the specification of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG1 is a schematic diagram of the three-dimensional structure of a heat treatment tool for batch heat treatment of steel bars with an ultra-large aspect ratio provided by an embodiment of the present invention;

[0028] FIG2 is a front view of a heat treatment tooling for batch heat treatment of steel bars with an ultra-large aspect ratio provided by an embodiment of the present invention;

[0029] FIG3 is a top view of a heat treatment tooling for batch heat treatment of steel bars with an ultra-large aspect ratio provided by an embodiment of the present invention;

[0030] FIG4 is a schematic structural diagram of a suspension plate provided in an embodiment of the present invention;

[0031] FIG5 is a schematic structural diagram of a heat treatment tooling provided in an embodiment of the present invention when suspending a steel rod.

[0032] Figure numerals: 1. Suspension plate; 11. Center hole; 12. First reinforcing rib; 13. Second reinforcing rib; 14. Suspension hole; 15. Suspension area; 151. Suspension area; 2. Suspension rod; 21. Flange; 22. Suspension hole; 3. Steel rod. DETAILED DESCRIPTION

[0033] The following is an explanation of the embodiments of the present invention by specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this embodiment. On the contrary, the purpose of introducing the invention in conjunction with the embodiment is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will contain many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0034] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0035] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0038] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0039] Please refer to Figures 1 to 5. Figures 1 to 3 are structural schematic diagrams from different perspectives of the heat treatment tooling for batch heat treatment of ultra-large aspect ratio steel bars provided by an embodiment of the present invention, Figure 4 is a structural schematic diagram of the suspension plate provided by an embodiment of the present invention, and Figure 5 is a structural schematic diagram of the heat treatment tooling provided by an embodiment of the present invention when suspending steel bars.

[0040] As shown in Figures 1 to 5, the present application provides a heat treatment tooling for batch heat treatment of steel bars 3 with an ultra-large aspect ratio, comprising a suspension plate 1 and a suspension rod 2 detachably connected to the center of the suspension plate 1;

[0041] The suspension plate 1 is provided in a disc shape, and a center hole 11 is provided in the center of the suspension plate 1;

[0042] The suspension rod 2 is arranged to penetrate the center hole 11, and the suspension rod 2 is arranged vertically relative to the suspension plate 1;

[0043] The suspension plate 1 has a plurality of suspension areas 15 evenly distributed circumferentially around the central hole 11. Each suspension area 15 is provided with a plurality of hanging holes 14. The hanging holes 14 are used to hang the ends of the steel rods 3.

[0044] A plurality of hanging areas 151 are sequentially distributed in the hanging area 15 from the central hole 11 to the edge of the hanging plate 1 ; at least one hanging hole is provided in the hanging area 151 , and the number of hanging holes in different hanging areas 151 is different.

[0045] In one embodiment, the suspension plate 1 is arranged in a disc shape, and the suspension rod 2 passes through the center hole 11 in the center of the suspension plate 1 and is arranged perpendicular to the suspension plate 1, so that the suspension plate 1 can be suspended horizontally by the suspension rod 2; further, the suspension plate 1 has a plurality of suspension areas 15 evenly distributed circumferentially around the center hole 11, and each suspension area 15 is provided with a plurality of hanging holes 14 for hanging steel rods 3; so that the plurality of steel rods 3 can be evenly distributed around the center hole 11 of the suspension plate 1 along the circumference of the suspension plate 1; so that the center of gravity of the plurality of steel rods 3 is located on the axis of the center hole 11 (or it can be understood that the center of gravity of the plurality of steel rods 3 is located on the axis of the suspension rod 2), so that the suspension rod 2 only needs to be lifted by a sling, which can ensure that the suspension plate 1 can stably suspend the plurality of steel rods 3, realize batch heat treatment of the steel rods 3 with a super-large aspect ratio, and at the same time, the steel rods 3 are heat treated by hanging, which can effectively avoid the deformation problem of the steel rod 3 forging during the heat treatment process.

[0046] In one embodiment, one end of the suspension rod 2 is provided with a flange 21 for supporting the suspension plate 1 , and the other end passes through the central hole 11 and is provided with a suspension hole 22 for connecting to a sling.

[0047] In one embodiment, the suspension hole 22 passes through the suspension rod 2 in a direction perpendicular to the axis of the suspension rod 2, and the suspension hole 22 can be connected to the sling by means of a cross pin or a nut, so that the suspension rod 2 can rotate relative to the sling on the sling, affecting the stability of the suspension plate 1 when suspending the steel rod 3.

[0048] Furthermore, the suspension rod 2 is arranged in the shape of a long rod, and one end of the suspension rod 2 is provided with a flange 21 for supporting the suspension plate 1, so that the suspension plate 1 is close to the end of the suspension rod 2 provided with the flange 21, and the suspension hole 22 is located at the end of the suspension rod 2 away from the flange 21, so that when the heat treatment tooling suspends the steel rod 3 for heat treatment or cooling, the suspension rod 2 only needs to extend the end supporting the suspension plate 1 into the high temperature environment, and the end of the suspension rod 2 provided with the suspension hole 22 can be away from the high temperature environment.

[0049] It will be understood by those skilled in the art that the suspension hole 22 provided on the suspension rod 2 will weaken the structural strength of the suspension rod 2. On the other hand, a high temperature environment will also reduce the structural strength of the suspension rod 2. Therefore, the suspension rod 2 is arranged in the above manner to prevent the portion of the suspension rod 2 where the suspension hole 22 is provided from being away from the high temperature environment, thereby ensuring the structural strength of the portion of the suspension rod 2 where the suspension hole 22 is provided, and thus ensuring the stability and reliability of the connection between the portion of the suspension rod 2 where the suspension hole 22 is provided and the sling.

[0050] In one embodiment, first reinforcing ribs 12 are provided between adjacent suspension areas 15 in the suspension plate 1, and different suspension areas 15 are separated by the first reinforcing ribs 12;

[0051] A second reinforcing rib 13 is provided around the edge of the suspension plate 1 .

[0052] It will be understood by those skilled in the art that the mass and volume of the ultra-large aspect ratio steel rod 3 are large (the length of the steel rod 3 can exceed 2 to 5 meters), so the process of installing a single steel rod 3 to the suspension plate 1 is complicated. Therefore, the suspension plate 1 is divided into different suspension areas 15 by the first reinforcement rib 12, so that different suspension areas 15 can be independently assembled with the ultra-large aspect ratio steel rod 3, thereby improving the assembly rate of the steel rod 3.

[0053] Furthermore, due to the extremely large aspect ratio of the steel rods 3 and the fact that only the distal ends of the steel rods 3 are positioned in the hanging holes 14 of the suspension plate 1, even slight deformation of the suspension plate 1 may cause significant displacement of the ends of the steel rods 3 away from the suspension plate 1, causing the steel rods 3 to contact adjacent steel rods 3, resulting in poor heat treatment or cooling of the steel rods 3. However, the provision of the first and second reinforcing ribs 12, 13 significantly enhances the structural strength of the suspension plate 1, thereby ensuring that the suspension plate 1 can stably suspend multiple steel rods 3 even at high temperatures and preventing collision or contact between the multiple steel rods 3.

[0054] In one embodiment, the center distance between different hanging holes 14 is ≥ 2.5d, where d is the diameter of the hanging hole 14. Furthermore, the risk of collision or contact between the multiple steel bars 3 is reduced.

[0055] At the same time, it is necessary to avoid setting the spacing between the hanging holes 14 to be too small, which will affect the structural strength of the suspension plate 1 and cause the suspension plate 1 to deform during heat treatment.

[0056] In one embodiment, four first reinforcing ribs 12 are provided, and the four first reinforcing ribs 12 evenly divide the suspension plate 1 into four suspension areas 15 .

[0057] In one embodiment, in the plurality of hanging areas 151 sequentially distributed in the suspension area 15 , the number of hanging holes arranged in each hanging area 151 gradually increases according to the order of sequential distribution.

[0058] It will be understood by those skilled in the art that the size of the suspension plate 1 is relatively large, so when installing steel rods 3 in different suspension areas 15 of the suspension plate 1 at the same time, it is difficult for the installers to observe the progress of the installation positions and numbers of steel rods 3 in different suspension areas 15 of the entire suspension plate 1.

[0059] Therefore, when the suspension plate 1 is not fully loaded with steel bars 3, when workers install the steel bars 3 in different suspension areas 15 of the suspension plate 1, it is easy for the installation positions of the steel bars 3 to be unevenly distributed, requiring reinstallation.

[0060] In one embodiment, the distribution order and position of multiple hanging areas 151 in each hanging area 15 of the suspension plate 1 are the same, so that by hanging the steel rods 3 in the corresponding hanging areas 151 in different hanging areas 15, it can be ensured that when the steel rods 3 are installed in different hanging areas 15 at the same time, it is only necessary to ensure that the hanging holes in the same hanging areas 151 in different hanging areas 15 are fully hung with steel rods 3, that is, it can be ensured that after the installation of multiple steel rods 3 is completed, their center of gravity is still located on the axis of the central hole 11 of the suspension plate 1, thereby ensuring that the suspension plate 1 stably suspends multiple steel rods 3, and realizes batch heat treatment of the steel rods 3 with ultra-large aspect ratio.

[0061] In one embodiment, the first hanging area 151, the second hanging area 151 and the third hanging area 151 are sequentially distributed in the hanging area 15;

[0062] The first hanging area 151 is located close to the center hole 11 and is provided with a hanging hole;

[0063] The third hanging area 151 is located near the edge of the suspension plate 1 and is provided with three hanging holes;

[0064] The second hanging area 151 is located between the first hanging area 151 and the third hanging area 151 and is provided with two hanging holes.

[0065] By adopting the above technical solution, any number of steel rods 3 from 1 to 6 can be suspended in the same suspension area 15, and any number of steel rods 3 suspended from 1 to 6 can be fully distributed in the first suspension area 151, the second suspension area 151 and / or the third suspension area 151; that is, when any number of steel rods 3 from 1 to 6 are suspended, it can be ensured that no situation occurs in which the steel rods 3 are not fully suspended in any suspension area 151.

[0066] In one example, when the suspension plate 1 needs to install 20 steel bars 3, only 5 steel bars 3 need to be installed in each suspension area 15. In order to ensure that the positions of the steel bars 3 are evenly distributed when the 4 suspension areas 15 are installed at the same time, it is only necessary to hang the second hanging area 151 and the third hanging area 151 in each suspension area 15 with steel bars 3. This allows the heat treatment tooling to perform heat treatment on batches of steel bars 3, saving heat treatment costs and improving production efficiency; and the deformation of steel bars 3 with a large aspect ratio can be effectively controlled. In addition, the heat treatment tooling of the present application can perform heat treatment on 24 steel bars 3 at the same time, significantly shortening the heat treatment cycle and effectively controlling the deformation of the steel bars 3.

[0067] In one embodiment, the diameter of the hanging hole 14 matches the diameter of the steel rod 3. For example, the diameter of the steel rod 3 can be Φ90 mm, and the diameter of the hanging hole 14 can be Φ100 mm. The end of the steel rod 3 can be hung in the hanging hole 14 by a cross pin or the like.

[0068] In one embodiment, the plurality of hanging holes in each hanging area 151 are evenly distributed circumferentially around the central hole 11 .

[0069] In one embodiment, the hanging hole 14 is rounded to ensure that the axis of the hanging hole 14 coincides with the axis of the steel rod 3 .

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heat treatment tool for batch heat treatment of steel bars with a large aspect ratio, characterized in that: It comprises a suspension plate and a suspension rod detachably connected to the center of the suspension plate; The suspension plate is in the shape of a disc, and a center hole is provided at the center of the suspension plate; The suspension rod is arranged through the central hole, and the suspension rod is arranged vertically relative to the suspension plate; The suspension plate has a plurality of suspension areas evenly distributed circumferentially around the central hole, and each of the suspension areas is provided with a plurality of hanging holes, and the hanging holes are used to hang the ends of the steel rods; A plurality of hanging areas are sequentially distributed in the hanging area from the central hole to the edge of the hanging plate; at least one hanging hole is arranged in the hanging area, and the number of the hanging holes in different hanging areas is different.

2. The heat treatment tooling for batch heat treatment of steel bars with a large aspect ratio according to claim 1, characterized in that: A first reinforcing rib is provided between adjacent suspension areas in the suspension plate, and different suspension areas are separated by the first reinforcing rib; A second reinforcing rib is arranged around the edge of the suspension plate.

3. The heat treatment tooling for batch heat treatment of steel bars with a large aspect ratio as claimed in claim 2, characterized in that: Four first reinforcing ribs are provided, and the four first reinforcing ribs evenly divide the suspension plate into four suspension areas.

4. The heat treatment tooling for batch heat treatment of steel bars with a large aspect ratio according to claim 1, characterized in that: In the plurality of hanging areas sequentially distributed in the suspension area, the number of hanging holes arranged in each hanging area gradually increases according to the order of sequential distribution.

5. The heat treatment tooling for batch heat treatment of steel bars with a large aspect ratio as claimed in claim 4, characterized in that: The suspension area is sequentially provided with a first hanging area, a second hanging area and a third hanging area; The first hanging area is arranged close to the central hole and is provided with a hanging hole; The third hanging area is arranged close to the edge of the suspension plate and is provided with three hanging holes; The second hanging area is located between the first hanging area and the third hanging area, and is provided with two hanging holes.

6. The heat treatment tooling for batch heat treatment of steel bars with a large aspect ratio according to claim 4 or 5, characterized in that: The plurality of hanging holes in each hanging area are evenly distributed circumferentially around the central hole.

7. The heat treatment tooling for batch heat treatment of steel bars with a large aspect ratio according to claim 1, characterized in that: One end of the suspension rod is provided with a flange for supporting the suspension plate, and the other end passes through the central hole and is provided with a suspension hole for connecting with a sling.

8. The heat treatment tooling for batch heat treatment of steel bars with a large aspect ratio according to claim 1, characterized in that: The center distance between different hanging holes is ≥2.5d, where d is the diameter of the hanging hole.

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