Heat treatment assembly tooling to prevent deformation of lugs on shaft parts

Abstract

This invention discloses a heat treatment assembly for preventing deformation of lugs on shaft parts, belonging to the field of heat treatment. It includes at least three combined support units symmetrically distributed and fixed to the longitudinal end of a base support platform. Each combined support unit has a base plate with matrix positioning holes and fixing holes for positioning connecting columns, arranged in a linear array within a longitudinal matrix honeycomb pattern of the horizontal reference of the base support platform. Each combined support unit includes: symmetrically positioned center height arms and self-centering arms with serrated edges. A pair of self-centering arms have dovetail grooves at their ends with arc-shaped conical surfaces that spatially center and position the workpiece to be treated. The axial bearing pressure transmitted by the arc-shaped flange at the top of the center height arms is ultimately transferred to the base support platform via the bracket arms and the self-centering arms. Workpieces with different lug sizes undergo heat treatment in the same heat treatment furnace.

Description

Technical Field

[0001] This invention belongs to the field of heat treatment, specifically relating to heat treatment tooling for preventing deformation of shaft lugs in the manufacturing technology of key shaft components for aerospace equipment. Background Technology

[0002] The landing gear components involved in the aerospace manufacturing industry are mostly key shaft parts of various types, and their service life directly affects the service life of the entire aircraft landing gear system. These key components are the guarantee of the landing gear. Heat treatment production cannot be separated from tooling and fixtures, but various types of heating furnace fixtures, trays, baskets, and racks are heated along with the workpiece. Sometimes, the heat they remove is equal to or greater than the heat of the workpiece, accounting for approximately 18% to 29% of the total heat, which undoubtedly increases the cost of heat treatment production. Heat treatment production is carried out at high temperatures, requiring the use of various auxiliary tooling to complete actions such as loading and unloading workpieces from and from the furnace, quenching, and transferring workpieces. These auxiliary toolings are crucial tools for ensuring smooth heat treatment production, ensuring the quality of workpiece heat treatment, and ensuring the safety of heat treatment operations. Therefore, it is necessary to design and manufacture various toolings according to different furnace types, different workpiece structures, and different process requirements. A typical example of multi-tooling setups consists of nearly a hundred different tooling fixtures and workpieces, resulting in significant manufacturing errors. Furthermore, for the heat treatment of small quantities of workpieces, heat treatment personnel or workers often need to temporarily fabricate simple tooling based on their production experience and the actual situation. The workpieces are loaded into these tooling fixtures and undergo the heat treatment process in a relatively static state. The operation of loading and unloading workpieces from the furnace requires manual work by heat treatment workers, utilizing various hand tools of different sizes, such as hooks, push rods, bars, and forks. Straightening the bending distortion of shaft-type workpieces requires the use of various shims; thin-plate and sheet-shaped workpieces that have undergone quenching distortion require the use of fixtures for shaping during tempering. Quenching of workpieces also requires the use of hanging baskets, wire mesh baskets, and hangers. Heat treatment tooling is prone to cracking, collapse, and burning at high temperatures, leading to scrapping and high manufacturing costs. Furthermore, in existing heat treatment fixtures, the upper hanging platforms are mostly fixed, which cannot meet the heat treatment needs of rods or shafts of different lengths. Alternatively, multiple hanging platforms can be added to the lifting rod, but these additional platforms result in high maintenance costs and complicated repairs. Additionally, existing rods or shafts are all pulled in or out of the fixture along the axial direction, making it difficult to remove or place long parts. Pit furnaces have the highest heat consumption, followed by box furnaces and conveyor belt furnaces. Conveyor belt furnaces have very long conveyor belts, and the parts are heated, cooled, and then reheated, resulting in significant ineffective heat loss. Moreover, for complex and small-quantity workpieces, heat treatment workers often need to fabricate fixtures on-site to complete the heat treatment task. Heat treatment of shaft parts requires pit furnaces and suitable hanging fixtures. Currently, the diameter range of the base of heat treatment furnaces, multi-purpose furnaces, and large pit-type carburizing furnaces is generally 1000-3000mm. The maximum size of the guide tube of a 50kW pit-type heat treatment furnace is φ2300mm×3500mm, and it can withstand high temperatures of 1000-1200 degrees Celsius. 4. Heat treatment fixtures for various shafts and gears undergoing carburizing, annealing, tempering, quenching, and other processes typically include pit-type furnace hangers, heat-resistant steel hangers, pit-type furnace bases, chassis, pallets, honeycomb panels, round material trays, hooks, etc.Commonly used fixtures include multi-purpose furnace tooling (multi-purpose furnace bottom plate, multi-purpose furnace charge basket, multi-purpose furnace combined charge basket, multi-purpose furnace blower shaft, charge tray, multi-purpose furnace connecting rod, column), furnace bottom plate (box furnace bottom plate, bogie furnace bottom plate, annealing furnace bottom plate, high-temperature furnace bottom plate), charge tray (vacuum furnace charge tray, powder metallurgy charge tray, precision casting charge tray, pit furnace charge tray, multi-purpose furnace charge tray), charge basket (vacuum furnace charge basket, precision casting charge basket, multi-purpose furnace charge basket, combined charge basket, heat treatment charge basket), and pit furnace lifting fixtures (tempering furnace lifting fixtures, carburizing furnace lifting fixtures, nitriding furnace lifting fixtures, pit annealing furnace lifting fixtures). However, there is still no detailed data and standards available for selecting the shaft diameter for hanging process heads. If long shafts use a bracket support arm single cantilever load-bearing structure, the load is at the far end of the cantilever. Thus, the longer the cantilever, the greater the downward torque under the same load, and consequently, the greater the sagging deformation at high temperatures. Two problems were observed during the hot furnace trial: ① The support ribs underwent significant deformation. ② The inner diameter of the central ring was too large. Although the stability was relatively good, the stabilizing effect of the central ring was not significant once tilting occurred. For large-diameter, thin-walled parts with thin-walled cutting edges, the significant deformation of the supports at high temperatures during heat treatment was mainly due to insufficient rib strength and the simple rectangular radial cross-section, resulting in poor resistance to bending and torsional deformation. The bearing-like rings had various shapes and sizes. Deformation mainly occurred on the three supports without bracket arms, manifesting primarily as bulging and torsional tilting. The support ribs with bracket arms are actually a triangular stable structure. A portion of the axial pressure is borne by the longitudinal ribs, and another portion by the bracket arms intersecting at a point. Their load-bearing capacity is much higher than that of the bracket arms. Simultaneously, thermal stress and structural stress cause a linkage effect in heat treatment deformation. Furthermore, significant sagging deformation occurred during the hot furnace test. Due to the structure of the pit-type gas carburizing furnace, the effective heating zone imposes certain restrictions on the placement of carburized workpieces within the furnace chamber. The material rack's full load is close to 10 tons, requiring the rack base to maintain a certain rigidity even at a carburizing temperature of 930℃. It is undeniable that long-shaft workpieces will experience severe bending deformation during actual heat treatment. To solve this problem, the placement of workpieces along their height must be considered comprehensively.

[0003] Vacuum heat treatment technology controls the phase transformation, microstructure, and residual stress of key components through heating, cooling, and vacuum control, thereby imparting performance or ultimate performance to these components. Therefore, vacuum heat treatment is a key technology for achieving long lifespan, high reliability, and weight reduction in critical basic components. Key components that have undergone vacuum heat treatment not only guarantee their required microstructure, mechanical properties, and processing performance, but also have their potential further explored, ensuring and improving their quality and lifespan, and maximizing the material's potential. Heat treatment fixtures are consumable parts, with the main failure mode being high-temperature oxidation and thinning, resulting in a significant decrease in strength. Welding and casting methods are commonly used to manufacture heat treatment fixtures. Controlling the cost of fixture materials and manufacturing is crucial for controlling heat treatment production costs. High-temperature strength refers to the fixture bearing the weight of the workpiece during prolonged heating at high temperatures, without severe deformation or disintegration. The high-temperature strength of the fixture is guaranteed by the materials and structure; however, if the structure is too strong, the weight is large, absorbing more heat energy, increasing the unit energy consumption of the workpiece, prolonging the heating time, and leading to higher production costs. Metal trays are heavy (e.g., those used in vacuum carburizing and quenching furnaces) and have a large heat capacity, which leads to increased quenching liquid temperature and reduced cooling capacity. Repeated heating and carburizing / quenching of the trays also causes internal phase transformations, inducing structural stress. Combined with thermal fatigue, this results in cracks and a significantly reduced service life. Furthermore, the weight and heat capacity of metal trays increase energy consumption. Vacuum furnace fixtures made of alloy materials, used at high temperatures (1200℃), have a short service life. Practice shows that proper heat treatment processes can achieve excellent microstructure, and excellent microstructure ensures excellent mechanical properties. Appropriate processing methods can effectively control deformation and cracking of heat treatment fixtures. Practical experience shows that the temperature difference between the surface and core of the workpiece during heating and cooling (uniform heating and cooling) is the main factor causing deformation of the heat treatment fixture. (Vacuum furnaces have the ability to control heating and cooling rates). Different processing methods can allow heat treatment fixtures to meet different usage conditions and performance requirements.

[0004] The manufacture of heat treatment fixtures involves several manufacturing and processing technologies and equipment. They are used to complete the loading, unloading, quenching, and transfer of workpieces, and are also important tools to ensure smooth production, the quality of workpiece heat treatment, and operational safety. Heat treatment fixtures are generally divided into two types: general-purpose fixtures and special-purpose fixtures. General-purpose fixtures are designed and manufactured primarily for furnace adaptability, and are suitable for the heat treatment of commonly used, high-volume workpieces. Their function is to complete the loading and unloading of workpieces, clamping them during heating and cooling processes, reducing workpiece deformation during heat treatment, and performing certain auxiliary tasks in heat treatment. Special-purpose fixtures are designed and manufactured specifically for the workpiece, combined with the furnace type, to meet the special loading requirements of the workpiece. Because heat-treated workpieces vary in shape and size, and heat treatment furnace types are diverse, the fixtures used in heat treatment also vary in form. For workpieces with complex shapes and strict dimensional requirements, special-purpose fixtures need to be designed to ensure certain special dimensional accuracy requirements. For certain large and heavy workpieces, special tooling needs to be designed according to the furnace type to facilitate loading and unloading, and to meet the requirements of vertical heating and quenching during heat treatment. General-purpose tooling and special-purpose tooling have significantly different functions and therefore cannot be used interchangeably.

[0005] The heat energy required for heating tooling fixtures typically accounts for 18% to 29% of the total heat energy. Therefore, reducing the weight of tooling fixtures is crucial for improving heating efficiency. One way to reduce weight is to improve the structure of the tooling fixtures. Heat treatment tooling plays an important role in vacuum heat treatment. Optimizing the design and rationally selecting tooling for different product structures, heat treatment materials, and heat treatment process requirements is of great significance for improving heat treatment quality and increasing production efficiency.

[0006] Vacuum heat treatment is a novel heat treatment technology that combines vacuum technology with heat treatment technology. The vacuum environment in vacuum heat treatment refers to an atmosphere with a pressure below one atmosphere, including low vacuum, medium vacuum, high vacuum, and ultra-high vacuum. Vacuum heat treatment refers to a heat treatment process that is carried out entirely or partially under vacuum conditions. Vacuum heat treatment can achieve almost all heat treatment processes involved in conventional heat treatment. Vacuum can refer to any gaseous space with a pressure less than one atmosphere (negative pressure). When the heat treatment process of metal is carried out in a vacuum, it is called vacuum heat treatment. Vacuum heat treatment can achieve almost all heat treatment processes, such as quenching, annealing, tempering, carburizing, chromizing, nitriding, and precipitation hardening; in quenching processes, it can achieve gas quenching, oil quenching, salt quenching, water quenching, and degassing.

[0007] Currently, the radial dimensions of loading shaft lugs used in key components of aerospace shafts, thin-walled cylinders, hollow shafts, irregularly shaped structures, long shaft lead screws, and pipes are large, with diverse shapes and sizes, narrow widths, and thin walls. Under heat treatment temperatures, the steel parts experience a certain amount of expansion, resulting in significant sagging deformation during hot furnace tests. The cross-sectional dimensions of the channel structure change relatively drastically, leading to large deformation and significant planar warping after heat treatment, making post-treatment correction difficult. The lug cross-sectional area is too small, resulting in poor inherent stability; when tilted, it will bear enormous lateral loads, increasing bending deformation at high temperatures and potentially causing tipping. The reduction in cross-sectional dimensions mainly occurs at the end ring. For ultra-high strength steel parts, quenching is performed in a vacuum quenching furnace after heating to a predetermined temperature and holding for a period of time to obtain a martensitic structure. While this method achieves high strength and hardness, it increases deformation and makes cracking during straightening more likely. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art, adapt to practical needs, and provide a heat treatment fixture for preventing ear deformation of shaft-type heat treatment parts that is simple in structure, occupies a small area, is easy to operate, is easy to adjust in size, is durable, and can be used to load shaft-type heat treatment parts. This fixture can meet the requirements of the heat treatment process and improve the processing efficiency of parts in subsequent processing.

[0009] The solution adopted by this invention to solve its technical problem is: a heat treatment assembly for preventing deformation of lugs on shaft parts, comprising: at least three combined bearing units 1 symmetrically distributed and fixed at the longitudinal end of the base support platform 8, characterized in that: each combined bearing unit 1 has a matrix positioning hole and a fixing hole for a positioning connecting column 5 on its base plate, and is arranged in a linear array in the longitudinal matrix honeycomb holes of the horizontal reference of the base support platform 8. The combined bearing unit 1 includes: symmetrically facing center height support arms 3 and self-centering support arms 2 with serrated strips. The arc-shaped conical surfaces at the ends of a pair of self-centering support arms 2 form dovetail grooves for centering and positioning the workpiece 6 to be treated in space. The bearing pressure transmitted axially by the arc-shaped flange at the top fulcrum of the center height support arm 3 is finally transferred to the base support platform 8 through the bracket support arm 7 and the self-centering support arm 2. The workpieces 6 with different lug sizes are heat treated in the same heat treatment furnace.

[0010] Compared with the prior art, the present invention has the following advantages:

[0011] The present invention comprises at least three combined bearing units that are symmetrically distributed and fixed at the longitudinal end of the base support platform (8). These units are connected to the heat treatment material plate via a base plate. The contact surface between the base plate and the heat treatment material plate is designed with mounting slots and positioning bosses, which can realize the supporting and fixing function of the tooling during the heat treatment process. The end face of the base plate is provided with fixing holes. In actual use, the installation position of the connecting parts can be adjusted according to the size of the parts and their lugs, thereby adjusting the position of the side plate.

[0012] Each combined support unit 1 of the present invention has matrix positioning holes and fixing holes for positioning connecting columns 5 on its base plate, and they are arranged in a linear array in the longitudinal matrix honeycomb holes of the horizontal reference of the base support platform 8. It has a small footprint, strong operability, simple size adjustment and good durability.

[0013] This invention uses a large base as a load-bearing platform, and achieves heat treatment of different types of lug-shaped parts by replacing different types of self-centering arms and center height arms. The dovetail groove is designed in an arc shape, which expands the inlet size of the load-bearing structure, improves the guiding performance of the self-centering arms, and greatly reduces the radial movement of the self-centering arms, thereby improving the radial stability of the center ring. The dovetail groove of the self-centering arms improves the centering accuracy of the self-centering arms and center height arms.

[0014] This invention combines the actual effective area size of each furnace type to freely assemble multiple furnace loading methods, adapting to different furnace types. The dovetail grooves at the ends of the symmetrically positioned support arms 3 and a pair of self-centering support arms 2 are centered in space to position the workpieces 6 to be processed. This can meet the needs of different shaft parts and products with different lug sizes to complete heat treatment in the same heat treatment furnace; fully utilize the maximum furnace capacity to improve efficiency.

[0015] The present invention provides a bracket arm that supports the workpiece along one side of the workpiece lug, with a central support arm at the center height. The bracket arms on both sides of the central height support arm are for loading racks. In addition, the central column of the central height support arm, which can serve as a support unit for the smooth surface of shaft parts, provides a fulcrum. Multiple fulcrums can be provided in the same plane to balance the load. All loads are transferred to the base of the rack and are borne by the rack. All loads correspond to their respective central axes. Neither the workpiece to be processed nor the central height support arm bears pressure, and there is sufficient linear expansion space at high temperatures.

[0016] The self-centering support arm side plates are all designed with oil guide grooves, which can prevent the mechanical properties of the lugs from failing to meet design requirements due to insufficient cooling during heat treatment and quenching. For some large and heavy workpieces, it is not necessary to design and manufacture them in conjunction with the furnace type, nor is it necessary to design special tooling with complex structures based on the furnace type. It is not only highly versatile but also convenient for loading and unloading from the furnace.

[0017] The load of the workpiece 6 with lugs and a self-centering support arm 2 is transferred entirely to the base support platform 8. Workpieces 6 with different lug sizes undergo heat treatment in the same heat treatment furnace. The deformation problem during repeated use is greatly alleviated. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the working state of the heat treatment assembly tooling for preventing deformation of lugs in shaft-type parts according to the present invention.

[0019] Figure 2 yes Figure 1 A three-dimensional schematic diagram of the tooling support unit;

[0020] Figure 3 yes Figure 2 A partial sectional view;

[0021] Figure 4 This is a partially enlarged schematic diagram of the removed section in Figure 1-1;

[0022] Figure 5 yes Figure 2 A schematic diagram of the decomposition process;

[0023] Figure 6 yes Figure 2 A schematic diagram of the T-shaped base;

[0024] Figure 7 yes Figure 2 A schematic diagram of the bracket support arm;

[0025] Figure 8 yes Figure 2 Schematic diagram of center height support arm;

[0026] In the diagram: 1 Combined load-bearing unit, flat base, 2 Self-centering support arm, 3 Center height support arm, 4 Support plate, 5 Positioning connecting column, 6 Workpiece to be processed, 7 Bracket support arm, 8 Base support platform.

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Detailed Implementation

[0028] See Figures 1-8In the exemplary preferred embodiment described below, a heat treatment assembly for preventing deformation of the lugs of shaft parts includes: at least three combined support units 1 symmetrically distributed and fixed at the longitudinal end of the base support platform (8), characterized in that: each combined support unit 1 has a matrix positioning hole and a fixing hole for the positioning connecting column 5 on its base plate, and is arranged in a linear array in the longitudinal matrix honeycomb holes of the horizontal reference of the base support platform 8. The combined support unit 1 includes: opposing symmetrical center height support arms 3 and self-centering support arms 2 with serrated strips. The arc-shaped conical surfaces at the ends of a pair of self-centering support arms 2 form dovetail grooves for centering and positioning the workpiece 6 to be treated in space. The bearing pressure transmitted axially by the arc-shaped flange at the top fulcrum of the center height support arm 3 is finally transferred to the base support platform 8 through the bracket support arm 7 and the self-centering support arm 2. The workpieces 6 with different lug sizes are heat treated in the same heat treatment furnace.

[0029] In an optional embodiment, the combined support unit 1 is made of at least one type of oxidation-resistant, sulfur-corrosion-resistant, and carburizing-resistant chromium-manganese-nitrogen-type austenitic heat-resistant steel, heat-resistant alloy, or austenitic stainless steel, wherein the carburizing-resistant and chromium-manganese-nitrogen-type austenitic heat-resistant steel component material is Ni3A. l Its material composition consists of 35%–88% Ni, 8%–11% Al, and 20%–26% Cr added, with the addition of Cr. Ni3A l The component lifespan is more than twice that of heat-resistant steel. This ceramic material possesses excellent thermal strength, creep resistance, and resistance to carburization. The heat-resistant alloys are 37% Ni-18% Cr with a maximum service temperature of 1000℃ and 80% Ni-20% Cr with a maximum service temperature of 1280℃. This allows tooling fixtures to achieve ideal structure and high-temperature strength, reducing heat loss and increasing furnace loading capacity. These two alloys have significant advantages over stainless steel. They exhibit high thermal strength, good high-temperature creep resistance, good thermal fatigue performance, and long service life. Furthermore, they can withstand embrittlement caused by different heat treatment atmospheres such as oxidation, carburization, and nitriding, as well as other factors. Ni3A l The manufactured components, due to their extended service life and reduced weight, can also improve heat treatment production efficiency by 10%.

[0030] In an optional embodiment,

[0031] Each composite support unit 1 has a rectangular base plate at the center of its base with a plug-in post and at least two limiting plug-in blocks located below its long side.

[0032] The upper end face of the self-centering support arm 2 is provided with fixing holes for positioning connecting column 5. In actual use, the installation position of positioning connecting column 5 can be adjusted according to the size of part 6, thereby adjusting the position of the side plate of bracket support arm 2.

[0033] Furthermore, the self-centering support arm 2 serves as a support unit for the smooth surface of shaft parts, enabling different shaft parts with different lug sizes to undergo heat treatment in the same heat treatment furnace. By replacing different types of self-centering support arms 2 and center height support arms 3, heat treatment of different types of lug parts can be achieved.

[0034] Furthermore, the bracket arm 7 for the workpiece 6 to be processed is provided with an oil guide groove along one side of the ear piece of the workpiece 6 to be processed.

[0035] Furthermore, oil guide grooves are designed on both sides of the center height support arm 3 used to support the workpiece 6 to be processed. The inner side of the bracket support arm 7 is provided with a rod-shaped parallel protrusion ring to restrict the free deformation of the next-level column protrusion ring.

[0036] Furthermore, the self-centering support arm 2 and the center height support arm 3 have all loads corresponding to their respective central axes, and the loads are borne by the dovetail groove arc surface bracket formed by a pair of bracket arms 7 and the top arc surface of the center height support arm 3. The center height support arm 3 has rod-shaped parallel protrusions on both sides to restrict the free deformation of the protrusions of the next-level column.

[0037] The base support platform 8 consists of two main parts: the bottom of the support platform base is made of heat-resistant alloy steel to reduce the weight of the material tray, and the top is made of at least one lightweight carbon / carbon composite material or graphite material to form a honeycomb grid plate.

[0038] Furthermore, the honeycomb grid panel is woven from carbon ropes into a mesh-like honeycomb structure, and then produced using a chemical vapor infiltration process to create carbon / carbon fiber and a carbon matrix or binder. The carbon / carbon (C / C) composite material constitutes the honeycomb panel, which is composed of extremely fine carbon atom filaments with a diameter of only 0.005–0.01 mm interwoven with a carbon matrix. The carbon matrix encapsulated within it can uniformly reduce weight and resist chemical reactions. They possess excellent mechanical strength, hardness, and thermal conductivity. Carbon / carbon composite materials have low heat capacity, high high-temperature strength, and negligible thermal deformation. The net weight / tare weight ratio is very suitable for material rack manufacturing, accelerating heating and cooling rates, increasing the load-bearing capacity of components, and reducing component deformation. Carbon / carbon composite materials also exhibit excellent resistance to thermal fatigue, significantly reducing crack propagation. It features lightweight, good air permeability, ablation resistance, corrosion resistance, wear resistance, high high-temperature strength, strong load-bearing capacity, no deformation, and ensures dimensional stability of the workpiece. C / C honeycomb grid panels are lightweight and have low heat storage, minimizing their impact on the quenching fluid temperature and ensuring its cooling capacity. They are also very easy to operate, significantly reducing labor intensity. Their low heat capacity allows for rapid heating and cooling, without lag in response to furnace temperature changes, greatly shortening the process cycle and saving energy. The carbon / carbon material undergoes no structural transformation and will not deform due to phase transformation stress during rapid heating and cooling, resulting in a long tray life. This not only reduces the weight of the material rack but also lowers energy consumption. The time to reach the specified temperature of 857℃ is shortened by 35 minutes compared to using an alloy material rack; the cooling rate is 10 minutes faster, cooling to 65℃, and the tray does not deform even after repeated use at 1200℃ for an extended period.

[0039] Graphite materials possess characteristics such as high temperature resistance, oxidation resistance, corrosion resistance, and high high-temperature strength, making them suitable for heat treatment processes. For example, when using a vacuum furnace with working area dimensions of 1200mm × 1200mm × 1800mm for solution treatment and annealing at high temperatures, the workpieces undergoing vacuum heat treatment not only increase production output but also achieve an ideal service life.

[0040] The tooling support unit is made of at least one type of oxidation-resistant, sulfur-corrosion-resistant, and carburizing-resistant chromium-manganese-nitrogen type austenitic heat-resistant steel, heat-resistant alloy, or austenitic stainless steel. Among these, the carburizing-resistant and chromium-manganese-nitrogen type austenitic heat-resistant steel component material is Ni3A. l Its material composition consists of 35%–88% Ni, 8%–11% Al, and 20%–26% Cr added, with the addition of Cr. Ni3A lThe component lifespan is more than twice that of heat-resistant steel. This ceramic material possesses excellent thermal strength, creep resistance, and resistance to carburization. The heat-resistant alloys have mass fractions of 37% Ni-18% Cr with a maximum service temperature of 1000℃ and 80% Ni-20% Cr with a maximum service temperature of 1280℃. This allows tooling fixtures to achieve ideal structure and high-temperature strength, reducing heat loss and increasing furnace loading capacity. These two alloys have significant advantages over stainless steel. They exhibit high thermal strength, good high-temperature creep resistance, good thermal fatigue performance, and long service life. Furthermore, they can withstand the embrittlement caused by different heat treatment atmospheres such as oxidation, carburization, and nitriding, as well as other factors. Ni3A l The manufactured components, due to their extended service life and reduced weight, can also improve heat treatment production efficiency by 10%.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A heat treatment assembly tool for preventing deformation of an ear of a shaft part, comprising: The application discloses a symmetrical distribution of at least three combined bearing units (1) fixed on the longitudinal end of the bottom support platform (8), characterized in that: the seat plate of each combined bearing unit (1) is provided with matrix positioning holes and positioning connecting column (5) fixing holes, and the linear array combined arrangement is arranged in the longitudinal matrix honeycomb hole of the horizontal reference of the bottom support platform (8), the combined bearing unit (1) comprises: a symmetrical center height support arm (3) and a self-centering support arm (2) provided with a sawtooth strip, a pair of self-centering support arms (2) end arc inclined conical surfaces form a dovetail groove for spatially centering and positioning a workpiece (6) to be processed, the center height support arm (3) top end support point arc flange axially transmits the bearing pressure, and finally the load of the workpiece (6) with an ear shaft cylinder is transmitted to the bottom support platform (8) through the bracket support arm (7) and the self-centering support arm (2), and workpieces (6) with different ear sizes can complete heat treatment in the same heat treatment furnace.

2. The heat treatment combined tooling for preventing deformation of the ear of the shaft part according to claim 1, wherein: The combined bearing unit (1) is made of at least one of chromium-manganese-nitrogen austenitic heat-resistant steel, heat-resistant alloy or austenitic stainless steel which is resistant to oxidation, sulfur corrosion and carburization.

3. The heat treatment combined tooling for preventing deformation of the ear of the shaft part according to claim 2, characterized in that: The carburization-resistant chromium-manganese-nitrogen austenitic heat-resistant steel component material is Ni3Al, the material composition of which is added with Cr, Zr, Mo and B, the mass fraction of the Ni3Al material is 35%-88% of Ni, 8%-11% of Al and 20%-26% of Cr.

4. The heat treatment combined tooling for preventing deformation of the ear of the shaft part according to claim 3, wherein: The mass fraction of the heat-resistant alloy is 37% of Ni-18% of Cr or 80% of Ni-20% of Cr, and the highest use temperature is 1280 DEG C.

5. The heat treatment assembly of claim 1, wherein: the first and second heat treatment assemblies are configured to heat treat the shaft member simultaneously. The rectangular seat plate center of the bottom support lower part of each combined bearing unit (1) is provided with a plug-in column and at least two limiting plug-in limiting blocks located below the long side.

6. The heat treatment assembly of claim 1, wherein: the first and second heat treatment assemblies are configured to heat treat the shaft member simultaneously. The self-centering support arm (2) is used as a support unit of the light surface of shaft parts, and can meet the heat treatment of different shaft parts with different ear sizes in the same heat treatment furnace, and the heat treatment of different types of ear parts can be realized by replacing different types of self-centering support arms (2) and center height support arms (3).

7. The heat treatment assembly of claim 1, wherein: the first and second heat treatment assemblies are configured to heat treat the shaft member simultaneously. The center height support arm (3) used for supporting the workpiece (6) to be processed is designed with oil liquid guide grooves on both sides; the bracket support arm (7) is provided with an oil liquid guide groove on the side of the ear of the workpiece (6) to be processed, and the inner side of the bracket support arm (7) is provided with a claw-shaped parallel convex ring for limiting the free deformation of the convex ring of the next stage stand.

8. The heat treatment assembly of claim 1, wherein: the first and second heat treatment assemblies are configured to heat treat the shaft member simultaneously. The self-centering support arm (2) corresponds to all loads on the respective center axes through the center height support arm (3), and the loads are borne by the dovetail groove arc surface bracket formed by a pair of bracket support arms (7) and the top arc light surface of the center height support arm (3); the bottom support platform (8) is composed of two parts, the bottom of the bearing platform plate seat is made of heat-resistant alloy steel to reduce the weight of the material disc, and the upper part is formed by at least one of light carbon / carbon composite material or graphite material to form a honeycomb lattice plate.

9. The heat treatment assembly of claim 1, wherein: the first and second heat treatment members are formed of a material selected from the group consisting of steel, cast iron, and aluminum. The combined carrier unit (1) is made of at least one of the following materials: oxidation-resistant, sulfur-corrosion-resistant and carburization-resistant chromium-manganese-nitrogen austenitic heat-resistant steel, heat-resistant alloy or austenitic stainless steel. The material of the carburization-resistant chromium-manganese-nitrogen austenitic heat-resistant steel component is Ni3Al, and the material composition is added with Cr, Zr, Mo and B. The mass fraction of the Ni3Al material is 35%-88% Ni, 8%-11% Al, and the added amount of Cr is 20%-26% Cr. The mass fraction of the heat-resistant alloy is 37% Ni-18% Cr, and the maximum use temperature is 1000°C.

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