Curve rail forge piece heat treatment method and tool
By using tooling of pallets and limiting components during the heat treatment of curved rail forgings, the problem of deformation of curved rail during the heat treatment process is solved, ensuring the dimensional stability and production quality of the product.
Patent Information
- Application Number
- CN202411856033.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2025-03-14
AI Technical Summary
Curve rail forgings are prone to deform during heat treatment, resulting in the size not meeting the design requirements and may even lead to product scrapping.
A tooling is adopted, including a pallet, a limiting assembly and a positioning member. Through the clamping effect of the load-bearing surface of the pallet and the limiting assembly, the deformation of the curved rail is limited and its stability during the heat treatment process is ensured.
It effectively reduces deformation of the curved rail during lifting and heating, prevents large deformation of the external dimensions after heat treatment, and avoids the risk of subsequent orthopedic treatment or product scrapping.
Smart Images
Figure CN119614835A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of heat treatment technology, and in particular to a heat treatment method and tooling for curved rail forgings. Background Art
[0002] like Figure 1 As shown in the figure, the curved rail is a type of arched forging with a small effective cross-section but a large diameter. It is formed by forging, stamping and bending, and then needs to go through a specific heat treatment process to achieve the mechanical performance parameters required by the design, so as to meet the requirements of the use environment. During this heating, quenching and cooling performance heat treatment process, the forging is prone to deformation, and quality defects such as bending and upper mouth expansion occur, making the workpiece unable to meet the design size. Most of them need to be bent again and stress relief treatment. Severe deformation may even lead to product scrapping.
[0003] Since the effective cross-section of the curved rail itself is small, and its diameter is large (e.g., effective cross-section ~240mm, shape ~R4220 / R3980×340mm, arc length ~8050mm, weight ~5200kg), the biggest difficulty in heat treatment of such thin-walled large-size forgings is deformation prevention. When heat treating the curved rail for performance, not too much heat treatment allowance will be added considering its hardenability. However, the performance heat treatment is a process of rapid heating and instantaneous rapid cooling. The uneven hot and cold inside and outside of the forgings leads to large changes in the internal structure of the material, and the shape is severely deformed and cannot meet the subsequent processing size requirements. Moreover, it is difficult to load and hoist such special-shaped parts as curved rails, and improper operation will also aggravate its deformation. Summary of the invention
[0004] The purpose of this application is to solve the problem in the prior art that the curved rail is easily deformed during heat treatment. Therefore, this application provides a heat treatment method and tooling for curved rail forgings, in which the curved rail is supported by a tray in the tooling, and the deformation of the curved rail is limited by a limit assembly and a positioning member, which effectively reduces the deformation of thin-walled forgings caused by their own weight and uneven force during lifting and heating, and effectively prevents large deformation of the forgings' external dimensions caused by rapid changes in the internal structure during heating and cooling.
[0005] The embodiment of the present application provides a method for heat treatment of a curved rail forging, using a tool, the tool comprising a tray, a plurality of limit assemblies, and a positioning member and / or a counterweight assembly, the tray is disc-shaped and has a flat bearing surface, the limit assembly comprises two side limit members and a top limit member for connecting the two side limit members, and the counterweight assembly comprises a counterweight member and a connecting member;
[0006] The method comprises:
[0007] S1: hoisting the curved rails: hoisting the curved rails onto the bearing surface of the pallet, and determining the positions of the curved rails on the bearing surface of the pallet and / or placing the counterweights according to the number of the curved rails, so that the weight of the pallet is balanced, and ensuring that two curved rails are symmetrically placed as a group, or one curved rail and one counterweight are placed as a group;
[0008] S2: Leveling the pallet: trimming the pallet, or filling the gap between the pallet and the curved rail, so that the curved rail is completely fitted with the pallet;
[0009] S3 welding limit components and assembling positioning parts and / or connecting parts: multiple limit components are arranged along the extension direction of the curved rail, and the two side limit components of the same limit component clamp the curved rail radially along the curved rail respectively, the side limit components are welded to the tray, and after the side limit components are completely fitted to the side of the curved rail by padding, the top of the two side limit components are welded with the top limit component across the curved rail, and the gap is filled; the positioning part is abutted between the inner side vertices of the two symmetrically arranged curved rails, and the gap is filled; and / or the connecting part is abutted between the side midpoint of the counterweight and the inner side vertex of the curved rail, and the gap is filled;
[0010] S4: Laying the pallet: hoisting the pallet with the curved rail installed onto the supporting pads in the heating furnace as a whole, and performing heat treatment, and hoisting the pallet as a whole out of the heating furnace after the heat treatment;
[0011] S5 cleaning the pallet: after the heat treatment is completed, the side limiters welded on the pallet are removed by a carbon planer, and the flatness of the pallet is corrected after it is lower than a threshold.
[0012] In some embodiments, the tray includes a plurality of ribs extending outward from the center of the tray in a uniform radial manner, and overflow spaces penetrating the thickness direction of the tray are formed between adjacent ribs, and the surface of each rib in the thickness direction forms the bearing surface; and,
[0013] In step S1, the curved rail is placed on part of the plurality of support bars, and the curved rail is evenly supported by part of the plurality of support bars;
[0014] In step S3, the side limiter is welded to the support rib.
[0015] In some embodiments, in step S1,
[0016] When the pallet carries a single curved rail, the curved rail opening is placed on one side of the pallet with the opening facing the center of the pallet, and a counterweight is placed on the other side of the pallet;
[0017] When the pallet carries two curved rails, the two curved rails are placed symmetrically with respect to the center of the pallet, and the openings of the two curved rails are both oriented toward the center of the pallet;
[0018] When the pallet carries four curved rails, the four curved rails are symmetrically arranged in pairs with respect to the center of the pallet and are placed inside and outside. The openings of the four curved rails are all facing the center of the pallet. A counterweight is placed on the inner side of the outer curved rail, and the two counterweights are symmetrically arranged with respect to the center of the pallet.
[0019] In some embodiments, in steps S2-S3, padding or filling is performed by using pad iron, refractory wool or iron filings.
[0020] In some embodiments, in step S4, two-point lifting or three-point lifting is adopted.
[0021] The embodiment of the present application also provides a tool for heat treatment of curved rail forgings, including:
[0022] A tray, wherein the tray is disc-shaped and has a flat bearing surface, wherein the tray comprises a plurality of ribs extending outward from the center of the tray in a uniform radial manner, and an overflow space penetrating the thickness direction of the ribs is formed between adjacent ribs, and a surface of each rib in the thickness direction of the rib forms the bearing surface;
[0023] A plurality of limiting assemblies for being arranged on the tray, the limiting assemblies comprising two side limiting members and a top limiting member for connecting the two side limiting members, and the two side limiting members of the same limiting assembly are used for clamping the curved rail radially along the curved rail;
[0024] A positioning member, the positioning member is used to abut between the inner vertices of the two symmetrically arranged curved rails; and / or,
[0025] A counterweight assembly, the counterweight assembly includes a counterweight member and a connecting member, the counterweight member is used to be arranged on the bearing surface of the pallet to balance the weight of the pallet, and the connecting member is used to abut between the side midpoint of the counterweight member and the inner vertex of the curved rail.
[0026] In some embodiments, the tray comprises an inner ring and an outer ring which are concentrically arranged, and the inner ring and the outer ring are connected by the plurality of ribs;
[0027] An overflow groove connected to the corresponding overflow space is provided between adjacent support ribs, and the overflow groove extends radially outward from the center of the tray and penetrates the surfaces of the inner ring and the outer ring at corresponding positions;
[0028] The adjacent overflow grooves are respectively arranged on two side surfaces of the tray in the thickness direction.
[0029] In some embodiments, the side limiter is a right-angled triangular prism, and the side surface where the hypotenuse of the side limiter is located is the clamping surface; the top limiter is a flat steel plate.
[0030] Beneficial effects:
[0031] The present application places the curved rail on a pallet during heat treatment, and supplemented by a certain number of limit components and positioning parts, which not only solves the problems of furnace loading and lifting, but also effectively prevents the uncontrolled deformation of the curved rail during heating and cooling, avoiding the risk of subsequent corrective treatment or large deformation resulting in product scrapping.
[0032] Other features and corresponding beneficial effects of the present application 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 records in the specification of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] Figure 1 It is a structural schematic diagram of the curved track;
[0034] Figure 2 A flow chart of the method of this application;
[0035] Figure 3 This is a schematic diagram of the structure of the pallet in the tooling of this application;
[0036] Figure 4 This is a schematic diagram of loading two curved rails for heat treatment in the same furnace for this application;
[0037] Figure 5 This is a schematic diagram of the furnace loading for heat treatment of a single curved track for this application;
[0038] Figure 6 This is a schematic diagram of loading multiple curved rails for heat treatment in the same furnace for this application.
[0039] Description of reference numerals:
[0040] 1. Curved track;
[0041] 100, tray; 101, bearing surface; 110, inner ring; 120, outer ring; 130, support ribs; 131, overflow space; 132, overflow groove;
[0042] 200, limit assembly; 210, side limit piece;
[0043] 300, positioning piece;
[0044] 400, counterweight assembly; 410, counterweight member; 420, connecting member. DETAILED DESCRIPTION
[0045] The following specific embodiments illustrate the implementation of the present application, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Although the description of the present application will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this application are limited to the implementation. On the contrary, the purpose of introducing the application in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present application. In order to provide a deep understanding of the present application, the following description will include many specific details. The present application can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.
[0046] 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 and explained in the subsequent drawings.
[0047] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description created by the present application, unless otherwise specified, "multiple" means two or more. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0048] See also Figure 1 , Figure 1 This is a schematic diagram of the structure of the curved track.
[0049] Curved rails are a type of circular arch forgings with a small effective cross-section but a large diameter. They are manufactured using a forging, stamping, bending and heat treatment process. During conventional heat treatment, quality defects such as bending and upper mouth expansion are prone to occur, making the workpiece unable to meet the design dimensions. Most of them require further bending correction and stress relief treatment. Severe deformation may even lead to product scrapping.
[0050] Embodiment 1:
[0051] See also Figure 2-6 , Figure 2 A flow chart of the method of this application; Figure 3 It is a structural schematic diagram of a tray 100 in the tooling of this application; Figure 4 This is a schematic diagram of loading two curved rails 1 for heat treatment in the same furnace for this application; Figure 5 This is a schematic diagram of the heat treatment furnace for a single curved rail 1 of this application; Figure 6 This is a schematic diagram of loading multiple curved rails 1 for heat treatment in the same furnace for this application.
[0052] The embodiment of the present application provides a method for heat treatment of curved rail 1 forgings, using a tooling, through which the deformation of thin-walled forgings caused by deadweight and uneven force during lifting and heating is effectively reduced, and at the same time, the large deformation of the forgings caused by the rapid change of internal structure during heating and cooling is effectively prevented, thereby avoiding the risk of subsequent orthopedic treatment or large deformation leading to product scrapping, thereby accelerating the production cycle, reducing production costs, and improving production quality. In addition, the tooling can be used multiple times in production and applied to the heat treatment of products of the same type and different sizes.
[0053] The tooling includes a tray 100, a plurality of limiter assemblies 200, and a positioning member 300 and / or a counterweight assembly 400. The tray 100 is disc-shaped and has a flat bearing surface 101. The limiter assembly 200 includes two side limiters 210 and a top limiter for connecting the two side limiters 21. The counterweight assembly 400 includes a counterweight 410 and a connecting member 420.
[0054] The method includes:
[0055] S1 hoisting the curved rail 1: hoist the curved rail 1 onto the load-bearing surface 101 of the pallet 100, and determine the position of the curved rail 1 on the load-bearing surface 101 of the pallet 100 and / or place the counterweight 410 according to the number of the curved rails 1, so that the weight of the pallet 100 is balanced, and ensure that the curved rails 1 are symmetrically placed as a group, or a curved rail 1 and a counterweight 410 are placed as a group.
[0056] S2 Leveling the pallet 100: trimming the pallet 100, or filling the gap between the pallet 100 and the curved rail 1, so that the curved rail 1 and the pallet 100 are completely fitted.
[0057] Since the strength of forgings decreases at high temperatures, they are easily deformed due to their own gravity if they are not placed flat. Therefore, the tray 100 must be adjusted as horizontally as possible during use to keep it in a good horizontal state.
[0058] In order to reduce the deformation of the curved rail 1 during the heating process in the furnace, the upper and lower surfaces of the tray 100 must be processed to be flat, especially the upper surface in contact with the curved rail 1 must be very flat, so that it can be completely in contact with the lower surface of the workpiece. When the tray 100 is deformed after being used for many times, it must be processed and rectified in time. When the deformation is small, you can check the gaps when loading the furnace and use small shims to fill them.
[0059] S3 welding limit assembly 200 and assembling positioning member 300 and / or connecting member 420:
[0060] A plurality of limit assemblies 200 are arranged along the extension direction of the curved rail 1, and the two side limit members 210 of the same limit assembly 200 clamp the curved rail 1 radially along the curved rail 1 respectively, and the side limit members 210 are welded to the tray 100, and after the side limit members 210 are fully fitted to the side of the curved rail 1 by padding, the tops of the two side limit members 210 are welded with the top limit members over the curved rail 1, and the gaps are filled.
[0061] The positioning member 300 is placed between the inner vertices of the two symmetrically arranged curved rails 1 to fill the gap.
[0062] And / or, the connecting member 420 is abutted between the midpoint of the side of the counterweight 410 and the inner vertex of the curved track 1 to fill the gap.
[0063] S4: Laying the pallet 100: hoisting the pallet 100 with the curved rail 1 installed onto the supporting pads in the heating furnace as a whole, and performing heat treatment. After the heat treatment, hoisting the pallet 100 as a whole is removed from the heating furnace.
[0064] That is, the pallet 100 equipped with the curved rail 1 is hoisted as a whole onto the supporting pads in the heating furnace by a crane. Since the pallet 100 is a circular structure, it is preferably hoisted and placed using a two-point hoist or a three-point hoist auxiliary hoist in conjunction with a crane.
[0065] At this time, the curved rail 1 has been assembled, and the lifting process must be careful to avoid collisions that cause the curved rail 1 to shift, etc. At the same time, you can check again whether the pallet 100, the pad iron and the curved rail 1 are completely fitted, and fill the gaps.
[0066] S5 cleaning the pallet 100: after the heat treatment is completed, a carbon planer is used to remove the side limiters 210 welded on the pallet 100, and after the flatness of the pallet 100 is lower than a threshold, correction is performed for subsequent use.
[0067] In one embodiment, the tray 100 includes a plurality of ribs 130 extending radially outward from the center of the tray 100 evenly, and overflow spaces 131 are formed between adjacent ribs 130 in the thickness direction thereof. The surface of each rib 130 in the thickness direction thereof forms a bearing surface 101 .
[0068] At this time, in step S1 , the curved rail 1 is placed on some of the plurality of supporting ribs 130 , and the curved rail 1 is evenly supported by some of the plurality of supporting ribs 130 .
[0069] In step S3 , the side limiter 210 is welded to the support rib 130 .
[0070] In this method, multiple points of contact are achieved between the multiple support ribs 130 of the tray 100 and the curved rail 1, so that the support points of the forging can be distributed as evenly as possible, and the contact area between the forging and the tooling can be increased, thereby reducing the heat treatment deformation of the thin-walled forging due to uneven support.
[0071] At the same time, since the volume of the support ribs 130 is smaller than the entire pallet 100, the overflow space 131 between the support ribs 130 is relatively large. Therefore, on the one hand, the weight of the pallet 100 can be reduced and the difficulty of lifting can be reduced. On the other hand, it can effectively ensure the rapid flow of quenching liquid during quenching of the curved rail 1 and the full contact between the quenching liquid and the forging, thereby improving the quenching effect and achieving the mechanical properties.
[0072] Furthermore, the side limiting member 210 is welded on the supporting rib 130 , which can further improve the limiting effect, strengthen the integrity of the curved rail 1 and the tray 100 , and further control the deformation of the curved rail 1 during the heat treatment process.
[0073] Generally, the number of the limiting components 200 can be determined according to the number of contact points between the curved rail 1 and the supporting ribs 130 of the tray 100 .
[0074] Usually, the curved rail 1 is heat treated in the same furnace in two pieces as a group, so as to take into account both efficiency and heat treatment effect.
[0075] In one embodiment, see Figure 4 In step S1 , when the tray 100 carries two curved rails 1 , the two curved rails 1 are placed symmetrically with respect to the center of the tray 100 , that is, they are centrally symmetrical, and their openings are both facing the center of the tray 100 .
[0076] In one embodiment, the method can also be used for heat treatment of a single curved rail 1, see Figure 5 When the pallet 100 carries a single curved rail 1 , the curved rail 1 is placed on one side of the pallet 100 with its opening facing the center of the pallet 100 , and the counterweight 410 is placed on the other side of the pallet 100 .
[0077] In one embodiment, the method can also be used for heat treatment of multiple curved rails 1. It is only necessary to ensure the overall counterweight balance and to form a whole in pairs, that is, to form two opposite curved rails 1 into a whole through the positioning member 300, and the curved rails 1 that cannot be formed into a whole through the positioning member 300 are formed into a whole with the counterweight assembly.
[0078] Take four curved rails 1 as an example, see Figure 6 When the pallet 100 carries four curved rails 1, the four curved rails 1 are symmetrically arranged in pairs with respect to the center of the pallet 100 and are arranged inside and outside. The openings of the four curved rails 1 are all facing the center of the pallet 100, and a counterweight 410 is placed on the inner side of the outer curved rail 1. The two counterweights 410 are symmetrically arranged with respect to the center of the pallet 100.
[0079] In the above method, when the curved rail 1 is placed on the pallet 100, the center of the pallet 100 is used as the center to achieve uniform contact between the curved rail 1 and the support rib 130, thereby increasing the contact area between the forging and the tooling as much as possible, avoiding heat treatment deformation of the forging due to uneven support, and facilitating subsequent positioning operations.
[0080] In one embodiment, in steps S2-S3, padding or filling is performed by using pad iron, refractory wool or iron filings.
[0081] In one embodiment, in step S4, two-point lifting or three-point lifting is adopted.
[0082] Embodiment 2:
[0083] See also Figure 3-6 The embodiment of the present application further provides a tooling for heat treatment of a curved rail 1 forging, comprising a tray 100, a plurality of limit assemblies 200, and a positioning member 300 and / or a counterweight assembly 400 arranged on the tray 100. The curved rail 1 is supported by the tray 100 in the tooling, and the deformation of the curved rail 1 is limited by the limit assemblies and the counterweight assemblies, thereby effectively reducing the deformation of the thin-walled forgings caused by their own weight and uneven force during the lifting and heating processes, and at the same time effectively preventing the large deformation of the forgings' outer dimensions caused by the rapid changes in the internal structure during the heating and cooling processes, thereby avoiding the risk of subsequent corrective treatment or large deformation leading to product scrapping.
[0084] In one embodiment, the tray 100 is in the shape of a disk and has a flat bearing surface 101 to provide a foundation for the forgings to be placed flatly.
[0085] Generally, the tray 100 is designed according to the characteristics of the lifting device of the forging in the high temperature state, and heat-resistant steel is selected and then cast. After casting, the upper and lower planes need to be machined to ensure its flatness in the height direction.
[0086] In addition, the diameter of the pallet 100 can be adjusted according to the size of the heating furnace and the size of the curved rail 1. In order to meet the use of curved rails 1 of various specifications and improve the versatility of the pallet 100, the pallet 100 can be designed to be slightly larger if the size of the furnace body allows. However, it cannot be enlarged indefinitely to avoid excessive weight of the pallet 100, which will increase energy consumption and lifting difficulty during the heating process.
[0087] In one embodiment, the tray 100 includes a plurality of ribs 130 extending radially outward from the center of the tray 100 and extending uniformly, and an overflow space 131 penetrating the thickness direction of the tray 100 is formed between adjacent ribs 130, and the surface of each rib 130 in the thickness direction forms the bearing surface 101. Preferably, the ribs 130 are in the shape of long strips.
[0088] In this method, multiple points of contact are achieved between the multiple support ribs 130 of the tray 100 and the curved rail 1, so that the support points of the forging can be distributed as evenly as possible, and the contact area between the forging and the tooling can be increased, thereby reducing the heat treatment deformation of the thin-walled forging due to uneven support.
[0089] At the same time, since the volume of the support ribs 130 is smaller than the entire pallet 100, the overflow space 131 between the support ribs 130 is relatively large. Therefore, on the one hand, the weight of the pallet 100 can be reduced and the difficulty of lifting can be reduced. On the other hand, it can effectively ensure the rapid flow of quenching liquid during quenching of the curved rail 1 and the full contact between the quenching liquid and the forging, thereby improving the quenching effect and achieving the mechanical properties.
[0090] In one embodiment, the pallet 100 includes an inner ring 110 and an outer ring 120 which are concentrically arranged, and the inner ring 110 and the outer ring 120 are connected by a plurality of ribs 130, thereby effectively controlling the weight of the pallet 100 and reducing the difficulty of lifting while ensuring the strength of the pallet 100.
[0091] At this time, the inner ring 110, the outer ring 120 and the support ribs 130 are arranged to form an overflow space 131, and the connection between the three is an arc transition, thereby improving the service life of the tray 100 and avoiding problems such as cracking caused by uneven heating and cooling of the tray 100 itself during the heating and cooling process along with the curved rail 1.
[0092] In one embodiment, an overflow groove 132 connected to the corresponding overflow space 131 is provided between adjacent support ribs 130. The overflow groove 132 extends radially outward from the center of the tray 100 and penetrates the surfaces of the inner ring 110 and the outer ring 120 at corresponding positions, thereby improving the flow stability of the quenching liquid.
[0093] Preferably, adjacent overflow grooves 132 are disposed on two side surfaces of the tray 100 in the thickness direction, so as to facilitate the front and back use of the tray 100.
[0094] In one embodiment, the limiting assembly 200 includes two side limiting members 210 , and the two side limiting members 210 of the same limiting assembly 200 are used to clamp the curved rail 1 radially along the curved rail 1 , thereby limiting radial deformation of the curved rail 1 during heat treatment.
[0095] Preferably, the side limiter 210 is welded to the support rib 130 of the pallet 100 after clamping the curved rail 1, so as to further improve the limiting effect, strengthen the integrity of the curved rail 1 and the pallet 100, and further control the deformation of the curved rail 1 during the heat treatment process.
[0096] Usually, the number of the limiting components 200 can be determined according to the number of contact points between the curved rail 1 and the support ribs 130 of the tray 100. The side limiting member 210 can be in any shape as long as it can achieve the clamping and limiting function, such as a quadrangular prism, a triangular prism, etc.
[0097] Furthermore, the clamping surface of the side limiter 210 clamping the curved rail 1 is filled to fit with the curved rail 1, thereby further improving the limiting effect. Alternatively, the clamping surface of the side limiter 210 is a curved surface that fits the curved rail 1.
[0098] Preferably, the side limiter 210 is a right-angled triangular prism, which is easy to process and saves materials. Further preferably, the side where the hypotenuse of the side limiter 210 is located is a clamping surface, so as to obtain the largest clamping surface, and the right angle relative to the clamping surface is set to obtain the best limiting effect.
[0099] In one embodiment, the limiting assembly 200 further includes a top limiting member, which is welded to the tops of the two side limiting members 210, so that the two side limiting members 210 form a whole, further improving the limiting effect. Preferably, the top limiting member cooperates with the tray 100 to clamp the curved rail 1, further improving the limiting effect on the curved rail 1.
[0100] The shape of the top limiting member is not limited as long as it can achieve the connection and / or limiting function, such as a flat steel plate.
[0101] In one embodiment, the positioning member 300 is used to abut between the inner vertices of two symmetrically arranged curved rails 1. Preferably, the positioning member 300 is rod-shaped.
[0102] In one embodiment, the weight assembly 400 includes a weight member 410 and a connecting member 420 .
[0103] The counterweight 410 is used to be disposed on the bearing surface 101 of the pallet 100 so as to balance the weight of the pallet 100 .
[0104] The connecting member 420 is used to abut between the side midpoint of the counterweight 410 and the inner vertex of the curved track 1, so that the counterweight 410 and the curved track 1 form a whole and can limit the inner deformation of the curved track 1. Preferably, the connecting member 420 is rod-shaped.
[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned 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 application.
Claims
1. A heat treatment method for a curved rail forging, characterized in that: A tool is used, the tool comprising a tray, a plurality of limit assemblies, and a positioning member and / or a counterweight assembly, the tray is disc-shaped and has a flat bearing surface, the limit assembly comprises two side limit members and a top limit member for connecting the two side limit members, and the counterweight assembly comprises a counterweight member and a connecting member; The method comprises: S1: hoisting the curved rails: hoisting the curved rails onto the bearing surface of the pallet, and determining the positions of the curved rails on the bearing surface of the pallet and / or placing the counterweights according to the number of the curved rails, so that the weight of the pallet is balanced, and ensuring that two curved rails are symmetrically placed as a group, or one curved rail and one counterweight are placed as a group; S2: Leveling the pallet: trimming the pallet, or filling the gap between the pallet and the curved rail, so that the curved rail is completely fitted with the pallet; S3 welding limit components and assembling positioning parts and / or connecting parts: multiple limit components are arranged along the extension direction of the curved rail, and the two side limit components of the same limit component clamp the curved rail radially along the curved rail respectively, the side limit components are welded to the tray, and after the side limit components are completely fitted to the side of the curved rail by padding, the top of the two side limit components are welded with the top limit component across the curved rail, and the gap is filled; the positioning part is abutted between the inner side vertices of the two symmetrically arranged curved rails, and the gap is filled; and / or the connecting part is abutted between the side midpoint of the counterweight and the inner side vertex of the curved rail, and the gap is filled; S4: Laying the pallet: hoisting the pallet with the curved rail installed onto the supporting pads in the heating furnace as a whole, and performing heat treatment, and hoisting the pallet as a whole out of the heating furnace after the heat treatment; S5 cleaning the pallet: after the heat treatment is completed, the side limiters welded on the pallet are removed by a carbon planer, and the flatness of the pallet is corrected after it is lower than a threshold.
2. The heat treatment method for curved rail forgings according to claim 1, characterized in that: The tray comprises a plurality of ribs extending outward from the center of the tray in a uniform radial manner, and overflow spaces penetrating the tray in the thickness direction are formed between adjacent ribs, and the surface of each rib in the thickness direction forms the bearing surface; and, In step S1, the curved rail is placed on part of the plurality of support bars, and the curved rail is evenly supported by part of the plurality of support bars; In step S3, the side limiter is welded to the support rib.
3. The heat treatment method for curved rail forgings according to claim 1, characterized in that: In step S1, When the pallet carries a single curved rail, the curved rail opening is placed on one side of the pallet with the opening facing the center of the pallet, and a counterweight is placed on the other side of the pallet; When the pallet carries two curved rails, the two curved rails are placed symmetrically with respect to the center of the pallet, and the openings of the two curved rails are both oriented toward the center of the pallet; When the pallet carries four curved rails, the four curved rails are symmetrically arranged in pairs with respect to the center of the pallet and are placed inside and outside. The openings of the four curved rails are all facing the center of the pallet. A counterweight is placed on the inner side of the outer curved rail, and the two counterweights are symmetrically arranged with respect to the center of the pallet.
4. The heat treatment method for curved rail forgings according to claim 1, characterized in that: In steps S2-S3, padding or filling is performed by using pad iron, refractory wool or iron filings.
5. The heat treatment method for curved rail forgings according to claim 1, characterized in that: In step S4, two-point or three-point lifting is adopted.
6. A tool for heat treatment of curved rail forgings, characterized in that: include: A tray, wherein the tray is disc-shaped and has a flat bearing surface, wherein the tray comprises a plurality of ribs extending outward from the center of the tray in a uniform radial manner, and an overflow space penetrating the thickness direction of the ribs is formed between adjacent ribs, and a surface of each rib in the thickness direction of the rib forms the bearing surface; A plurality of limiting assemblies for being arranged on the tray, the limiting assemblies comprising two side limiting members and a top limiting member for connecting the two side limiting members, and the two side limiting members of the same limiting assembly are used for clamping the curved rail radially along the curved rail; A positioning member, the positioning member is used to abut between the inner vertices of the two symmetrically arranged curved rails; and / or, A counterweight assembly, the counterweight assembly includes a counterweight member and a connecting member, the counterweight member is used to be arranged on the bearing surface of the pallet to balance the weight of the pallet, and the connecting member is used to abut between the side midpoint of the counterweight member and the inner vertex of the curved rail.
7. The tooling according to claim 6, characterized in that: The tray comprises an inner ring and an outer ring which are concentrically arranged, and the inner ring and the outer ring are connected by the plurality of support ribs; An overflow groove connected to the corresponding overflow space is provided between adjacent support ribs, and the overflow groove extends radially outward from the center of the tray and penetrates the surfaces of the inner ring and the outer ring at corresponding positions; The adjacent overflow grooves are respectively arranged on two side surfaces of the tray in the thickness direction.
8. The tooling according to claim 6, characterized in that: The side limiter is a right-angled triangular prism, and the side surface where the hypotenuse of the side limiter is located is the clamping surface; the top limiter is a flat steel plate.