Titanium alloy variable cross-section gradient structure dual-performance disc rolling integrated forming method and disc part

Abstract

The invention discloses a rolling integrated forming method for a titanium alloy variable cross-section gradient structure dual-performance disc and a disc piece. The two sides of the titanium alloy variable cross-section gradient structure double-performance disc are provided with a first ring groove stretching across the disc center to the disc edge partial area, a second ring groove located in the middle of the first ring groove and a step ring structure located on the outer side of the disc edge. The temperature gradient moving outwards in the radial direction is established and kept through the combined action of induction heating of a disc center area and a disc edge area of a titanium alloy disc blank and a forced water cooling measure of the disc center area, and tissue forming control is achieved through specific parameters of low temperature-high strain rate-large deformation and high temperature-low strain rate-small deformation. According to the method, the purpose of accurately controlling the crystal double-organization structure in the integral forming process of the titanium alloy with low production cost and manufacturing period can be achieved.

Description

Technical Field

[0001] The present application relates to the technical field of manufacturing high-end aviation difficult-to-deform metal equipment, and specifically to a method for integrally forming a titanium alloy variable-section gradient structure dual-performance disk by rolling and a disk component. Background Art

[0002] With the development of aviation technology and the increase of thrust-to-weight ratio of aircraft engines, the service environment temperature of compressors and turbines has increased significantly, which has led to increasingly harsh working conditions for the hot end components of engines. In order to meet the working needs of turbine disks in large stress gradient and large temperature gradient service environments, it is urgent to improve and change the materials or structures of hot end components such as engine turbine disks and compressor disks. Titanium alloys have the advantages of low density, high toughness, and good corrosion resistance, making them widely used in this field and have been widely used in hot end components of aircraft engines. The fifth generation of aircraft engines with high thrust-to-weight ratios in the world use dual-performance turbine disks. This dual-performance turbine disk is crucial to improving the performance of aircraft. The dual-performance turbine disk is a new generation of turbine disks with fine grain structure in the center and coarse grain structure at the edge. The center has a low working temperature and high torque resistance, so fine grain structure is required to ensure sufficient tensile strength and fatigue resistance. The high working temperature at the edge requires coarse grain structure to ensure sufficient durability, creep and fatigue crack growth resistance. Titanium alloy is a difficult-to-deform metal material with a narrow forming process window. The microstructure of titanium alloy has various forms such as equiaxed, bimorph, basketweave, and Widmanstätten structures. Therefore, the dual-structure control of titanium alloy dual-performance disks is difficult.

[0003] For titanium alloy dual-performance disc parts, most of the current forming processes and methods use integral die forging + graded multiple heat treatments, which require large forming loads, high mold requirements, large transitional tissue ranges, and poor tissue uniformity. For example, the invention with publication number CN101629273A provides a method for forging a dual-performance rectangular beam by step-by-step forging with the temperature of each pass of the disc forging being consistent as a whole, controlling the microstructure by controlling the total deformation, and requiring multiple heating, multiple forming, and a long cycle, and it is difficult to avoid the problem of multi-pass microstructure inheritance; the invention with publication number CN109652749A needs to achieve a gradient distribution of hydrogen content in the disc blank, and has strict requirements on the composition of the raw materials. The process parameters of hydrogen for raw materials of different batches and specifications are different, so there are certain limitations; the invention with publication number CN118910524A is only applicable to simple structures and thin-walled parts, and is limited to disc-shaped parts with a certain thickness and complex structure; the invention with publication number CN116159951A also has the problems of many forming passes, many heating times for deformation and heat treatment, complex design of deformation molds for different parts, and long forming cycle.

[0004] Therefore, how to accurately control the dual structure in the integral forming of titanium alloy disc parts and reduce the production cost and manufacturing cycle as much as possible is the key issue that needs to be solved urgently. Summary of the invention

[0005] In view of this, the main purpose of this application is to provide a method and disk component for rolling an integrated forming method of a titanium alloy variable-section gradient-structure dual-performance disk, which is conducive to achieving the purpose of accurately controlling the crystal dual-structure in the integrated forming of titanium alloy with lower production cost and manufacturing cycle.

[0006] In a first aspect, the present application provides a method for rolling an integrated titanium alloy variable cross-section gradient structure dual-performance disk, wherein the titanium alloy variable cross-section gradient structure dual-performance disk has a first annular groove spanning a portion of the disk center to the disk edge, a second annular groove located in the middle of the first annular groove, and a step ring structure located outside the disk edge on both sides, and the forming method includes:

[0007] Install the titanium alloy disc blank to the mandrel of the clamping part, and make the titanium alloy disc blank rotate at a constant speed through the mandrel;

[0008] Heating the titanium alloy disc blank and cooling the center area of ​​the titanium alloy disc blank at the same time, waiting for the temperature of the titanium alloy disc blank from the center area to the edge area to form and maintain the titanium alloy rolling forming temperature gradient range, wherein the titanium alloy rolling forming temperature gradient range is 850°C ± 10°C to 1000°C ± 10°C;

[0009] According to the thickness of the titanium alloy disc blank, the first deformation ratio and the second deformation ratio, the first axial downward pressure in the disc center area and the second axial downward pressure in the disc edge area are set for each rolling process, wherein the value range of the first deformation ratio is 13.3% to 18.2%, and the value range of the second deformation ratio is 6.7% to 10%;

[0010] According to the first axial downward pressure and the corresponding first and second rolling head speeds, and the second axial downward pressure and the corresponding third rolling head speed, the two sides of the titanium alloy disc blank are rolled in sequence from a specific position of the disc center area along the radial direction outward to form a first annular groove, wherein the first rolling head speed is 5r / min, the second rolling head speed is 4r / min, and the third rolling head speed is 3r / min;

[0011] According to the first axial downward pressure and the second rolling head speed, the second axial downward pressure and the corresponding fourth rolling head speed, the two sides of the titanium alloy disc blank are rolled in sequence from a specific position of the transition zone along the radial direction outward to form a second annular groove, wherein the fourth rolling head speed is 2r / min;

[0012] According to the second axial downward pressure and the fourth rolling head speed, the outer side of the disk edge of the titanium alloy disk blank is rolled to form a step ring;

[0013] According to the preset heat treatment temperature and holding time range, the titanium alloy variable cross-section gradient structure dual-performance disk having a first ring groove, a second ring groove and a step ring structure is heat treated, and the heat-treated titanium alloy variable cross-section gradient structure dual-performance disk is water-cooled to room temperature. The preset heat treatment temperature is 875°C, and the holding time range is 1h to 1.5h.

[0014] As shown above, the uniform rotation of the titanium alloy disc billet can make the titanium alloy disc billet heated evenly. While heating the titanium alloy disc billet, the center area of ​​the titanium alloy disc billet is forced to be water-cooled. After a period of time, the titanium alloy rolling forming temperature gradient range is obtained, which can accurately control the microstructural evolution of the titanium alloy and maintain product performance. In this temperature gradient range, the corresponding axial downward pressure and rolling head speed are set for the center area, transition area and edge area of ​​the titanium alloy disc billet, respectively, and the titanium alloy disc billet is gradually moved outward along the radial direction from the center area of ​​the disc, and the shapes between the three areas are rolled respectively to obtain a titanium alloy variable cross-section gradient structure dual-performance disc with a first annular groove, a second annular groove and a step ring. Through precise axial downward pressure and rolling head Parameters such as rotation speed can accurately control the deformation process of the titanium alloy disc blank, optimize its microstructure and mechanical properties, improve the forming accuracy and the controllability and repeatability of the process, effectively reduce defects and scrap rate, and are particularly suitable for high-end manufacturing industries that have strict requirements on material properties and geometric shapes; heat treatment of titanium alloy variable cross-section gradient structure dual-performance discs at 875℃ can promote the uniform distribution of alloying elements in the titanium alloy and eliminate residual stress, improve the organizational structure of each region, enhance the homogeneity of the deformed organization, and further improve the stability of the transition zone organization; the holding time of 1h to 1.5h is helpful to control the degree of organizational homogeneity of titanium alloy disc parts, thereby affecting the mechanical properties of titanium alloy materials.

[0015] Optionally, according to the first axial downward pressure and the corresponding first rolling head speed and the second rolling head speed, the second axial downward pressure and the corresponding third rolling head speed, rolling is sequentially performed on both sides of the titanium alloy disc blank from a specific position of the disc center area along the radial direction outward, and further comprising:

[0016] According to the first axial downward pressure and the first rolling head speed, the center areas on both sides of the titanium alloy disc blank are rolled;

[0017] According to the first axial downward pressure and the second rolling head speed, the transition areas on both sides of the titanium alloy disc blank are rolled;

[0018] According to the second axial downward pressure and the third rolling head rotation speed, the disk edge areas on both sides of the titanium alloy disk blank are rolled.

[0019] From the above, by setting precise axial downward pressure and rolling head speed in different areas of the titanium alloy disc blank, not only can the mechanical properties be optimized by area, but also the plastic deformation of each part of the titanium alloy disc blank from the center area to the edge area can be ensured to be more uniform, thereby reducing the generation of waste and reducing manufacturing costs.

[0020] Optionally, according to the first axial downward pressure and the second rolling head speed, the second axial downward pressure and the corresponding fourth rolling head speed, rolling is sequentially performed on both sides of the titanium alloy disc blank from a specific position of the transition zone along the radial direction outward, and further comprising:

[0021] According to the first axial downward pressure and the second rolling head speed, a part of the transition zone inside the first annular groove is rolled;

[0022] According to the second axial downward pressure and the fourth rolling head rotation speed, a partial area of ​​the disc edge region located inside the first annular groove is rolled.

[0023] From the above, by additionally rolling the internal transition zone of the first annular groove and part of the disk edge area, a gradient structure can be formed on a smaller scale, and product performance can also be improved.

[0024] Optionally, the first axial downward pressing amount is equal to half of the product of the thickness of the titanium alloy disc blank and the first deformation ratio, wherein the thinner the thickness of the titanium alloy disc blank is, the larger the value of the first deformation ratio is.

[0025] From the above, different first deformation ratios are selected according to different titanium alloy disc blank thicknesses, and the first axial downward pressure amount set for the center area of ​​the titanium alloy disc blank is obtained to ensure the optimal forming effect of the titanium alloy disc blank.

[0026] Optionally, the second axial downward pressing amount is equal to half of the product of the thickness of the titanium alloy disc blank and the second deformation ratio, wherein the thinner the thickness of the titanium alloy disc blank is, the larger the value of the second deformation ratio is.

[0027] From the above, for the edge area of ​​the titanium alloy disc blank, according to the thickness of the titanium alloy disc blank, the appropriate second deformation is selected to obtain the second axial downward pressure to ensure the optimal forming effect of the titanium alloy disc blank.

[0028] Optionally, mounting the titanium alloy disc blank to a mandrel of the clamping portion, and rotating the titanium alloy disc blank at a uniform speed through the mandrel, comprises:

[0029] Two mandrels clamp the inner hole of the titanium alloy disc blank, and an induction heating coil is arranged at both ends of the diameter of the titanium alloy disc blank, from the disc edge to the disc center, and a space matching the width of the rolling head is reserved between the two induction heating coils;

[0030] According to the preset downward pressure and the preset rolling head speed, multiple rolling heads attached to both sides of the titanium alloy disc are started to rotate, driving the titanium alloy disc to rotate at a uniform speed inside the induction heating coil. The preset downward pressure is 1mm, and the preset rolling head speed is 2r / min.

[0031] From the top, the two mandrels can servo feed and withdraw, which is convenient for installing the titanium alloy disc blank. The inner hole of the center of the titanium alloy disc blank can be used for the mandrel to penetrate, and the mandrel plays a supporting and clamping role; induction heating coils are installed on the upper and lower ends of the titanium alloy disc blank respectively. The induction heating coil is similar to an arc-shaped shell, and the upper and lower semicircles of the titanium alloy disc blank can be placed therein respectively. After the induction heating coils at both ends are installed, space with the width of the rolling head will be leaked, which is convenient for the rotation and downward pressure of the rolling head, and the two do not interfere with each other; the rotation of the rolling head can drive the titanium alloy disc blank to rotate for uniform heating.

[0032] Optionally, the two mandrels clamp the inner hole of the center of the titanium alloy disk blank, and further include:

[0033] The front ends of the two mandrels respectively pass through the inner holes of the disk center of the titanium alloy disk blank, wherein the interior of the mandrel is hollow and a rotating joint is inserted therein, and the rotating joint is externally connected to a water cooling system.

[0034] As above, cooling water enters the core shaft from the water inlet of the rotary joint, so that the temperature of the front end of the core shaft is reduced, and the inner hole of the center of the titanium alloy disc blank is clamped through the front end of the core shaft to exchange heat with the titanium alloy disc blank. The return water that takes away the heat from the center area of ​​the titanium alloy disc blank returns to the water tank of the water cooling system from the return water port of the rotary joint, and the reciprocating cycle realizes the forced cooling of the center area of ​​the titanium alloy disc blank. In addition, by adjusting the water pressure of the cooling system, the cooling effect of the center area can be adjusted, and the temperature of the center area can be controlled to be lower than its grain growth temperature.

[0035] Optionally, heating the titanium alloy disc blank and cooling the center area of ​​the titanium alloy disc blank at the same time, waiting for the temperature of the titanium alloy disc blank from the center area to the edge area thereof to form and maintain the titanium alloy rolling forming temperature gradient interval, further comprising:

[0036] Adjust the positions of infrared temperature measuring devices at the center and edge of the titanium alloy disk, and start the induction heating power supply and water cooling system;

[0037] The temperature of the titanium alloy disc blank from the disc center area to the disc edge area is detected in real time by the infrared temperature measuring device. After the temperature of the disc center area reaches a first preset temperature, the induction heating power and the water pressure of the water cooling system are adjusted so that the temperature of the titanium alloy disc blank is kept warm for a preset time, wherein the first preset temperature is 700°C;

[0038] The induction heating power and the water pressure of the water cooling system are adjusted to heat the titanium alloy disc again. After the temperature of the disc center area reaches the second preset temperature, the induction heating power and the water pressure of the water cooling system are adjusted again to make the temperature of the titanium alloy disc blank be 850℃±10℃ in the disc center area and 1000℃±10℃ in the disc edge area after the preset time. Thus, a temperature gradient range for titanium alloy rolling forming is formed, in which the second preset temperature is 850℃ and the preset time is 30min.

[0039] From above, the titanium alloy disc billet rotates in the upper and lower induction heating coils. The farther outward the titanium alloy disc billet moves radially, the longer it is heated and the higher its temperature is. As a result, a temperature gradient gradually decreases from the outside to the inside of the titanium alloy disc billet along the radial direction. By measuring the temperature of a certain point of the titanium alloy disc billet through an infrared temperature measuring device and PID adjusting the induction heating power and the water pressure of the water cooling system, the temperature gradient range from the disc center area to the disc edge area can be controlled and maintained.

[0040] In a second aspect, the present application also provides a rolling forming device for a titanium alloy variable cross-section gradient structure dual-performance disk, which includes: a clamping portion, which includes two mandrels, and the two mandrels are fixedly clamped at the inner holes of the disk center on both sides of the titanium alloy disk blank;

[0041] The induction heating part includes two induction heating coils, which are arranged at both ends of the diameter of the titanium alloy disc blank, from the disc edge to the disc center, and a space matching the width of the rolling head is reserved between the two induction heating coils;

[0042] The water cooling part of the disk core includes two rotary joints, which are assembled inside the two core shafts, and the rotary joints are provided with cold water pipes and return water pipes, and the rotary joints are externally connected to the water cooling system;

[0043] The temperature measuring part includes two infrared temperature measuring devices, which are respectively arranged in the disk center area and disk edge area of ​​the titanium alloy disk blank;

[0044] The rolling head moving part includes four rolling heads, a rotating motor connected to each rolling head, an axial feeding device and a radial feeding device. Every two rolling heads are respectively arranged on both sides of the center of the titanium alloy disc blank on both sides. The rolling heads roll the titanium alloy disc blank from the center area to the edge area through the rotating motor, the axial feeding device and the radial feeding device.

[0045] As shown above, the titanium alloy disc blank is heated from the disc edge to the disc center by the induction heating part, forming a temperature gradient with the temperature gradually decreasing from the disc edge to the disc center, and the disc center area of ​​the titanium alloy disc blank is forced to be water-cooled by the disc center water cooling part. Through the real-time temperature measurement of the temperature measuring part, the induction heating power is PID adjusted and the water pressure of the water cooling system is adjusted to stably maintain the temperature gradient range of the titanium alloy disc blank between 850℃±10℃~1000℃±10℃; under the active rotation, downward pressure and feeding of the rolling head, different shapes and structures are rolled out; the equipment relies on a near-net labor-saving forming method, which can reduce the forming load and processing cost, does not need to change the mold, and has high production efficiency.

[0046] In the third aspect, the present application also provides a titanium alloy variable cross-section gradient structure dual-performance disk for aviation, which is formed by rolling the titanium alloy variable cross-section gradient structure dual-performance disk in one piece according to any one of the methods described in the first aspect and using the equipment described in the second aspect to form a titanium alloy variable cross-section gradient structure dual-performance disk having a first annular groove spanning a portion of the disk center to the disk edge, a second annular groove located in the middle of the first annular groove, and a step ring structure located outside the disk edge.

[0047] From the above, the titanium alloy variable-section gradient dual-performance disk has a specific shape, and its variable-section structure is complex. The center area of ​​the disk has good fine-grained structure to ensure sufficient tensile strength and fatigue resistance, the transition area is small and the structure is uniform, and the edge area of ​​the disk has good coarse-grained structure to ensure sufficient durability, creep and fatigue crack growth resistance. The titanium alloy variable-section gradient dual-performance disk only needs one heating and one forming, has a short forming cycle, no mold requirements, and low production cost. It can be mass-produced for use in aircraft engines, compressors or turbine disks.

[0048] In summary, the present application provides a titanium alloy variable cross-section gradient structure dual-performance disk rolling integrated forming method and disk parts, the forming method realizes the temperature gradient distribution of the titanium alloy disk blank from the disk center along the radial direction by controlling the induction heating of the disk center area and the disk edge area of ​​the titanium alloy disk blank and the forced water cooling of the disk center area, and then by keeping the disk center area of ​​the titanium alloy disk blank within the range of 850℃±10℃ and the disk edge area within the range of 1000℃±10℃, different organizational forms are obtained according to the titanium alloy material under different deformation temperatures, deformation amounts and strain rate parameters, and a larger rolling forming is set in the disk center area with lower temperature of the titanium alloy disk blank. The downward pressure of the forming is set to adapt to the large deformation of the titanium alloy material, and the larger rolling head rotation speed is used to adapt to the high strain rate of the titanium alloy material. In the disk edge area where the temperature of the titanium alloy disc billet is higher, a smaller rolling forming downward pressure is set to adapt to the small deformation of the titanium alloy material, and a smaller rolling head rotation speed is used to adapt to the low strain rate of the titanium alloy material. The titanium alloy disc billet center area has an equiaxed fine-grained structure and the disc edge area has a basket structure, which has good formability and mechanical properties; the temperature field gradient difference in the middle transition zone of the titanium alloy disc billet is appropriate, the transition interval is small, the organization is uniform, and there is no abnormal grain growth and mixed crystal distribution. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The various technical features of the present application and the relationship between them are further explained below with reference to the accompanying drawings. The accompanying drawings are exemplary, and some technical features are not shown in actual proportion. In addition, some drawings may omit technical features that are commonly used in the technical field to which the present application belongs and are not essential for understanding and implementing the present application, or additional technical features that are not essential for understanding and implementing the present application may be shown. In other words, the combination of the various technical features shown in the accompanying drawings is not used to limit the present application. In addition, throughout the present application, the same figure numbers refer to the same content. The specific description of the drawings is as follows:

[0050] Figure 1 It is a partial view of a rolling forming device for a titanium alloy variable cross-section gradient structure dual-performance disk in the present application;

[0051] Figure 2 It is a flow chart of a method for rolling and integrally forming a titanium alloy variable-section gradient-structure dual-performance disk in the present application;

[0052] Figure 3a-3d This is a step-by-step rolling forming structure diagram of a titanium alloy variable cross-section gradient structure dual-performance disk in this application;

[0053] Figure 4a-4c It is a crystal organization diagram of a titanium alloy variable cross-section gradient organization dual-performance disk obtained using the parameters listed in this application.

[0054] Description of Reference Numerals

[0055] 1-lower induction heating coil; 2-rolling head a; 3-rolling head b; 4-right mandrel; 5-titanium alloy disc; 6-upper induction heating coil; 7-rolling head c; 8-rolling head d; 9-left mandrel; 10-water inlet of left rotary joint; 11-water outlet of left rotary joint; 12-water inlet of right rotary joint; 13-water outlet of right rotary joint, in the figure, D represents diameter and H represents thickness.

[0056] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0057] The preferred embodiments of the present application are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present application can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present application.

[0058] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0059] It should be noted that, in the description herein, the terms "middle", "front", "back", "top", "bottom", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 should not be understood as a limitation on the present application.

[0060] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The specific embodiments described below can be combined with each other to form new embodiments. The same or similar ideas or processes described in one embodiment may not be repeated in other embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0061] The present application aims at manufacturing a variable cross-section complex structure and gradient organization dual-performance disk-type parts for titanium alloy materials, based on the dynamic recrystallization and static recrystallization grain refinement mechanism of the center area of ​​the titanium alloy disk blank 5, and the dynamic grain growth of the small deformation and waiting temperature and the coarse grain control mechanism of the static grain growth of the edge area of ​​the titanium alloy disk blank 5, through the induction heating of the center area and the edge area of ​​the titanium alloy disk blank 5 and the forced water cooling of the center area, while controlling the temperature, deformation amount and deformation rate, four rolling heads are used for multi-pass rolling to realize the complex structure forming and organization control of the variable cross-section and gradient organization of the titanium alloy. The equipment and method used in the present application are particularly suitable for high-end manufacturing industries with strict requirements on material properties and geometric shapes, such as the aerospace field.

[0062] [Specific embodiment of the rolling forming equipment for titanium alloy variable cross-section gradient structure dual-performance disk]

[0063] The present application discloses a rolling forming device for titanium alloy variable cross-section gradient structure dual-performance disks, which includes a clamping part, an induction heating part, a disk core water cooling part, a temperature measuring part and a rolling head moving part.

[0064] The clamping part includes two mandrels, left and right. Figure 1 As shown, the left mandrel 9 and the right mandrel 4 are respectively fixedly clamped at the inner holes of the disk center on both sides of the titanium alloy disk blank 5, and the left mandrel 9 and the right mandrel 4 support and clamp the titanium alloy disk blank 5, and the left mandrel 9 and the right mandrel 4 can be servo-fed and withdrawn, so as to facilitate the lifting of the titanium alloy disk blank 5.

[0065] The induction heating part includes two induction heating coils, which are arranged at both ends of the diameter of the titanium alloy disc blank 5, from the disc edge to the disc center, and a space matching the width of the rolling head is reserved between the two induction heating coils. Figure 1 As shown, induction heating coils are installed on the upper and lower ends of the titanium alloy disc blank 5 respectively. The induction heating coils are similar to arc-shaped shells, and the upper and lower semicircles of the titanium alloy disc blank 5 can be placed therein. After the induction heating coils at both ends are installed, a space with the width of the rolling head will be leaked, which is convenient for the rolling head to rotate and press down; the core area of ​​the titanium alloy disc blank 5 is in the gap between the upper induction heating coil 6 and the lower induction heating coil 1, and is not within the encirclement of the induction heating coils. The temperature of the core area of ​​the titanium alloy disc blank 5 is mainly generated by heat transfer from the induction heated area on its outer side, and its temperature change trend is mainly that the temperature gradually increases with the increase of the induction heating time on its outer side.

[0066] In order to effectively control the temperature of the center area of ​​the titanium alloy disk blank 5 to be lower than the grain growth temperature, the equipment is also equipped with a disk center water cooling part, which includes two rotary joints, which are assembled inside the two mandrels, and the rotary joints are provided with cold water pipes and return water pipes. The rotary joints are externally connected to the water cooling system, see Figure 1 The left mandrel 9 and the right mandrel 4 on both sides of the center area of ​​the titanium alloy disc blank 5 are hollow inside, and the rotary joints arranged inside them have a cold water pipe and a return water pipe. Each mandrel end is connected to a rotary joint. After the cooling water enters from the left rotary joint water inlet 10 and the right rotary joint water inlet 12, it flows through the cold water pipe inside the mandrel to exchange heat with the center area of ​​the titanium alloy disc blank 5. The return water that takes away the heat from the center area of ​​the titanium alloy disc blank 5 returns to the water tank of the water cooling system from the left rotary joint water outlet 11 and the right rotary joint water outlet 13, and the reciprocating cycle realizes forced cooling of the center area of ​​the titanium alloy disc blank 5. In addition, the cooling effect of the center area of ​​the titanium alloy disc blank 5 can be adjusted by adjusting the water pressure of the water cooling system, so as to control the temperature of the center area of ​​the titanium alloy disc blank 5 to be lower than the grain growth temperature.

[0067] The temperature measuring part includes two infrared temperature measuring devices, which are respectively arranged in the center area and the edge area of ​​the titanium alloy disc blank 5; the infrared temperature measuring device can be an independent infrared thermometer or a temperature measuring probe arranged inside the temperature measuring system; the present application takes the use of an infrared thermometer as an example for explanation; infrared thermometers are respectively placed at the center and edge positions of the titanium alloy disc blank 5, and the infrared thermometers are connected to the induction heating power supply, which can actually control the temperature of the center area of ​​the titanium alloy disc blank 5 to the set value, that is, the first preset temperature (700°C) and the second preset temperature (850°C). When the temperature is lower than the set value, the induction heating coil works at high power for heating, and when the temperature is higher than the set value, the induction heating coil works at low power for heating. In short, stable temperature control can be achieved.

[0068] The rolling head moving part includes four rolling heads, a rotating motor connected to each rolling head, an axial feeding device and a radial feeding device, and each two rolling heads are respectively arranged on both sides of the center of the titanium alloy disc blank 5 on both sides thereof. The rolling heads roll the titanium alloy disc blank 5 from the center area to the edge area of ​​the disc through the rotating motor, the axial feeding device and the radial feeding device; Figure 1 As shown, rolling head a and rolling head d are respectively arranged on both sides of the inner hole of the disk center on the same side of the titanium alloy disk blank 5, and rolling head b and rolling head c are respectively arranged on both sides of the inner hole of the disk center on the same side of the titanium alloy disk blank 5; the uniform rotation of rolling head a, rolling head b, rolling head c and rolling head d can drive the titanium alloy disk blank 5 to rotate for uniform heating, and the radial feeding device and the axial feeding device can complete the forming of different structures on the titanium alloy disk blank 5.

[0069] The equipment can reduce forming load and processing cost, does not require mold replacement, has high production efficiency, and can be applied to the forming and manufacturing of other difficult-to-deform metal disc parts.

[0070] [Specific embodiment of the rolling integral forming method of titanium alloy variable cross-section gradient structure dual-performance disk]

[0071] The present application provides a method for rolling and integrally forming a titanium alloy variable cross-section gradient structure dual-performance disk, wherein the titanium alloy variable cross-section gradient structure dual-performance disk has a first annular groove spanning a portion of the disk center to the disk edge, a second annular groove located in the middle of the first annular groove, and a step ring structure located outside the disk edge, such as Figure 2 As shown, the forming method includes:

[0072] S1: Install the titanium alloy disc blank 5 onto the mandrel of the clamping part, and rotate the titanium alloy disc blank 5 at a constant speed through the mandrel.

[0073] S101: two mandrels clamp the inner hole of the center of the titanium alloy disk blank 5, and an induction heating coil is respectively arranged at both ends of the diameter of the titanium alloy disk blank 5, from the disk edge to the disk center, and a space matching the width of the rolling head is reserved between the two induction heating coils;

[0074] S102: According to the preset downward pressure and the preset rolling head speed, the plurality of rolling heads attached to both sides of the titanium alloy disc blank 5 are started to rotate, so as to drive the titanium alloy disc blank 5 to rotate at a uniform speed inside the induction heating coil, wherein the preset downward pressure is 1 mm, and the preset rolling head speed is 2 r / min.

[0075] Step 1001: prepare a titanium alloy disc blank 5 (Ti-6Al-4V, grade TC4) formed by rolling. The initial structure of the titanium alloy disc blank 5 is an equiaxed fine-grained structure. After machining, the inner hole diameter D1 of the titanium alloy disc blank 5 is 40 mm, the outer diameter D2 of the titanium alloy disc blank 5 is 500 mm, the disc thickness is 60 mm (i.e., the length of the titanium alloy disc blank 5 along the axial direction), and the roughness of the outer surface of the titanium alloy disc blank 5 is Ra1.6. Figure 3a The titanium alloy disc blank 5 sample shown;

[0076] Step 1002: withdraw the right mandrel 4 in the horizontal direction, hoist the titanium alloy disc blank 5 until the inner hole of the disc center is aligned with the left mandrel 9 and inserted into the left mandrel 9, feed the right mandrel 4 to clamp the titanium alloy disc blank 5, and ensure that there is no slippage between the titanium alloy disc blank 5 and the two mandrels;

[0077] Step 1003: According to the vertical setting position of the titanium alloy disc blank 5, the upper and lower induction heating coils similar to arc-shaped shells are installed at the upper and lower ends of the titanium alloy disc blank 5, and the positions of the upper and lower induction heating coils are fixed by the induction heating coil fixing frame to ensure that a space for the rolling head to move is reserved between the two induction heating coils.

[0078] Step 1004: Start the control system of the rolling forming equipment, attach the four rolling heads to the surface of the titanium alloy disc blank 5 respectively, set the axial downward pressure of the rolling heads to 1mm, ensure that there is no slipping space between the four rolling heads and the titanium alloy disc blank 5, start the rotation of the four rolling heads, and set the rolling head speed to 2r / min to ensure that the titanium alloy disc blank 5 can rotate at a uniform speed.

[0079] S2: heating the titanium alloy disc blank 5, and cooling the center area of ​​the titanium alloy disc blank 5 at the same time, waiting for the temperature of the titanium alloy disc blank 5 from its center area to the disc edge area to form and maintain the titanium alloy rolling forming temperature gradient range, wherein the titanium alloy rolling forming temperature gradient range is 850℃±10℃~1000℃±10℃.

[0080] S201: adjusting the positions of the infrared temperature measuring devices at the center and the edge of the titanium alloy disk blank 5, and starting the induction heating power supply and the water cooling system;

[0081] S202: The temperature of the titanium alloy disc blank 5 from the disc center area to the disc edge area is detected in real time by the infrared temperature measuring device. After the temperature of the disc center area reaches a first preset temperature, the induction heating power and the water pressure of the water cooling system are adjusted so that the temperature of the titanium alloy disc blank 5 is kept warm for a preset time, wherein the first preset temperature is 700° C.;

[0082] S203: Adjust the induction heating power and the water pressure of the water cooling system to heat the titanium alloy disc blank 5 again, wait for the temperature of the disc center area to reach the second preset temperature, and then adjust the induction heating power and the water pressure of the water cooling system again, so that after the temperature of the titanium alloy disc blank 5 is kept warm for a preset time, the temperature of the titanium alloy disc blank 5 in the disc center area is 850℃±10℃, and the temperature in the disc edge area is 1000℃±10℃, thereby forming a titanium alloy rolling forming temperature gradient range, wherein the second preset temperature is 850℃, and the preset interval is 30min.

[0083] Step 2001: Adjust the positions of the two infrared thermometers at the center and the edge of the titanium alloy disk blank 5, start the induction heating power supply and the water cooling system, heat the titanium alloy disk blank 5, and use the infrared thermometer to measure the temperature in real time during heating. The heating temperature at the center of the titanium alloy disk blank 5 is set to 700°C and kept warm for 30 minutes.

[0084] Step 2002: Adjust the heating temperature to 850℃±10℃ and keep it warm for 30 minutes. At this time, the temperature at the center of the titanium alloy disk blank 5 is 850℃±10℃, the temperature at the edge of the titanium alloy disk blank 5 is 1000℃±10℃, and the temperature of the four rolling heads is basically maintained between 700-800℃.

[0085] S3: According to the thickness of the titanium alloy disc blank 5, the first deformation ratio and the second deformation ratio, the first axial downward pressure in the disc center area and the second axial downward pressure in the disc edge area are set for each rolling pass, wherein the first deformation ratio ranges from 13.3% to 18.2%, and the second deformation ratio ranges from 6.7% to 10%.

[0086] Since the thickness of the titanium alloy disc blank 5 prepared in step 1001 is given as 60 mm, the axial downward pressure of the center area, transition area and edge area of ​​the titanium alloy disc blank 5 can be set; in the center area and transition area of ​​the titanium alloy disc blank 5, the first deformation ratio of the first rolling in the center area and the transition area is 13.3%, and the first axial downward pressure can be 4 mm, that is, the rolling head presses down 4 mm at the relative positions of the center areas on both sides of the titanium alloy disc blank 5; in the edge area of ​​the titanium alloy disc blank 5, the second deformation ratio of the first rolling in the edge area is 6.7%, and the second axial downward pressure is 2 mm, that is, the rolling head presses down 2 mm at the relative positions of the edge areas on both sides of the titanium alloy disc blank 5.

[0087] After each rolling is completed, the corresponding area of ​​the titanium alloy disc blank 5 will become thinner, and finally Figure 3b As shown, it changes from H1 to H2, so the axial downward pressure in the next pass will select a larger deformation ratio to keep the settings of the first axial downward pressure and the second axial downward pressure in the specific area of ​​the titanium alloy disc blank 5 unchanged.

[0088] For example, the initial thickness of the titanium alloy disc blank 5 is 60 mm. After the first rolling of the disc center area is completed, the second rolling is carried out. At this time, the thickness of the disc center area is 52 mm. The first deformation ratio that needs to be selected for the second rolling can be 15.4%, which ensures that the first axial downward pressure value of the second rolling is 4 mm.

[0089] S4: According to the first axial downward pressure and the corresponding first and second rolling head speeds, the second axial downward pressure and the corresponding third rolling head speed, the two sides of the titanium alloy disc blank 5 are rolled in sequence from a specific position in the disc center area along the radial direction outward to form a first annular groove, such as Figure 3b The pattern shape of the first annular groove is shown, and the thickness of the first annular groove is H2. The first rolling head has a rotation speed of 5r / min, the second rolling head has a rotation speed of 4r / min, and the third rolling head has a rotation speed of 3r / min.

[0090] S401: According to the first axial downward pressure and the first rolling head speed, the center area on both sides of the titanium alloy disc blank 5 is rolled; according to the first axial downward pressure and the second rolling head speed, the transition area on both sides of the titanium alloy disc blank 5 is rolled; according to the second axial downward pressure and the third rolling head speed, the edge area on both sides of the titanium alloy disc blank 5 is rolled. The first annular groove rolled out according to this setting requires two rolling procedures. The two rolling procedures are as follows:

[0091] Step 4001: In the temperature gradient range of titanium alloy rolling forming, the first step rolling program set in advance is called. The first step rolling program is divided into four rolling heads at the initial position 100mm away from the center of the titanium alloy disk blank 5, pressing down 4mm in the axial direction, and the rolling head rotating speed is 5r / min; the four rolling heads are lifted and moved outward in the radial direction by 40mm, and then pressed down 4mm in the axial direction, and the rolling head rotating speed is 4r / min; the four rolling heads are lifted and moved outward in the radial direction by 30mm, and then pressed down 2mm in the axial direction, and the rolling head rotating speed is 3r / min, and then pressed down 2mm in the axial direction, and the rolling head rotating speed is 3r / min;

[0092] Step 4002: After completing the first step of the rolling program, call the second step of the rolling program. The second step of the rolling program is divided into four rolling heads at an initial position of 102mm away from the center of the titanium alloy disc blank 5, pressing down 4mm in the axial direction and rotating at a speed of 5r / min; the four rolling heads are lifted up and moved outward in the radial direction by 40mm, and then pressed down 4mm in the axial direction and rotating at a speed of 4r / min; the four rolling heads are lifted up and moved outward in the radial direction by 24mm, and then pressed down 2mm in the axial direction and rotating at a speed of 3r / min, and then pressed down 2mm in the axial direction and rotating at a speed of 3r / min.

[0093] S5: According to the first axial downward pressure and the second rolling head speed, the second axial downward pressure and the corresponding fourth rolling head speed, the two sides of the titanium alloy disc blank 5 are rolled in sequence from the specific position of the transition zone along the radial direction outward to form a second annular groove, referring to Figure 3c The pattern shape of the second annular groove is shown, and the thickness of the second annular groove is H3, wherein the rotation speed of the fourth rolling head is 2r / min.

[0094] S501: According to the first axial downward pressure and the second rolling head speed, the transition zone inside the first annular groove is rolled; according to the second axial downward pressure and the fourth rolling head speed, the rim zone inside the first annular groove is rolled. The second annular groove rolled out according to this setting requires two rolling procedures. The two rolling procedures are as follows:

[0095] Step 5001: After the second rolling procedure is completed, the third rolling procedure is called. The third rolling procedure is divided into four rolling heads at an initial position 150 mm away from the center of the titanium alloy disk blank 5, pressing down 4 mm in the axial direction, and the rolling head rotating speed is 4 r / min; the four rolling heads are lifted and moved outward in the radial direction by 25 mm, and then pressed down 2 mm in the axial direction, and the rolling head rotating speed is 2 r / min; and pressed down another 2 mm in the axial direction, and the rolling head rotating speed is 2 r / min;

[0096] Step 5002: After completing the third step of the rolling program, call the fourth step of the rolling program. The fourth step of the rolling program is divided into four rolling heads at an initial position of 152mm away from the center of the titanium alloy disc blank 5, pressing down 4mm in the axial direction and rotating at a speed of 4r / min; the four rolling heads are lifted and moved outward in the radial direction by 20mm, then pressed down 2mm in the axial direction and rotating at a speed of 2r / min, and then pressed down 2mm in the axial direction and rotating at a speed of 2r / min.

[0097] S6: According to the second axial downward pressure and the fourth rolling head speed, the outer side of the disk edge of the titanium alloy disk blank 5 is rolled to form a step ring, referring to Figure 3d The pattern shape of the second ring groove is shown, and the thickness of the step ring is H4.

[0098] Step 601: After completing the fourth step of the rolling procedure, call the fifth step of the rolling procedure. The fifth step of the rolling procedure is divided into four rolling heads pressing down 2mm axially at a distance of 30mm from the edge of the disk, and the rolling head rotating speed is 2r / min; pressing down 2mm axially, and the rolling head rotating speed is 2r / min, and pressing down another 2mm axially, and the rolling head rotating speed is 2r / min.

[0099] S7: According to the preset heat treatment temperature and holding time range, the titanium alloy variable cross-section gradient structure dual-performance disk having the first ring groove, the second ring groove and the step ring structure is heat treated, and the heat-treated titanium alloy variable cross-section gradient structure dual-performance disk is water-cooled to room temperature. The preset heat treatment temperature is 875°C, and the holding time range is 1h to 1.5h.

[0100] Step 701: After completing each step of the rolling procedure in sequence, turn off the induction heating power supply, withdraw the rolling head from the surface of the titanium alloy variable cross-section gradient structure dual-performance disk, remove the upper induction heating coil 6 and the lower induction heating coil 1, turn off the water cooling system, and complete the rolling forming of the titanium alloy variable cross-section gradient structure dual-performance disk.

[0101] Step 702: heat-treating the deformed titanium alloy variable-section gradient structure dual-performance disk at a temperature of 875° C. for 1 h to 1.5 h, and then water-cooling the disk to room temperature.

[0102] On the other hand, the present application also provides a titanium alloy variable cross-section gradient structure dual-performance disk for aviation, which is formed by rolling the titanium alloy variable cross-section gradient structure dual-performance disk in one piece using any of the above-mentioned methods and using the above-mentioned equipment to form a titanium alloy variable cross-section gradient structure dual-performance disk having a first annular groove spanning a portion of the disk center to the disk edge, a second annular groove located in the middle of the first annular groove, and a step ring structure located on the outside of the disk edge.

[0103] Specifically, the titanium alloy variable cross-section gradient structure dual-performance disc has a specific shape, its variable cross-section structure is complex, and the disc core area has a good fine grain structure, such as Figure 4a As shown, it can ensure sufficient tensile strength and fatigue resistance, with a small transition interval and good organizational uniformity, such as Figure 4b As shown in Figure 2, the disk edge area has a good coarse grain structure. Figure 4c As shown, sufficient durability, creep and fatigue crack growth resistance can be guaranteed. The titanium alloy variable-section gradient structure dual-performance disc only needs one heating and one forming, has a short forming cycle, no mold requirements, and low production cost. It can be mass-produced for use in aircraft engines, compressors or turbine discs.

[0104] The overall forming of the disc blank is achieved through a local rolling forming process. The characteristics of local loading, small contact area between the rolling head and the disc blank, and rotating tangential force result in a smaller forming load for this forming process. Compared with traditional hot die forging, it is a labor-saving and flexible forming process with smaller forming tonnage requirements for equipment, longer die service life, shorter process cycle, and flexible and changeable deformation trajectory of the rolling head. Therefore, it can greatly reduce production costs and dependence on molds, and is suitable for the forming and manufacturing of a variety of difficult-to-deform metal disc-shaped parts. The prepared products have broad application prospects and benefits in the fields of military industry, aerospace, transportation, etc.

[0105] In summary, the present application provides a titanium alloy variable cross-section gradient structure dual-performance disk rolling integrated forming method and disk parts, the forming method realizes the temperature gradient distribution of the titanium alloy disk blank 5 from the disk center along the radial direction by controlling the induction heating of the disk center area and the disk edge area of ​​the titanium alloy disk blank 5 and the forced water cooling of the disk center area, and then by keeping the disk center area of ​​the titanium alloy disk blank 5 within the range of 850℃±10℃ and the disk edge area within the range of 1000℃±10℃, different organizational forms are obtained according to the titanium alloy material under different deformation temperatures, deformation amounts and strain rate parameters, and a larger rolling pressure is set in the disk center area with lower temperature of the titanium alloy disk blank 5. The forming downward pressure is adapted to the large deformation of the titanium alloy material, and the larger rolling head rotation speed is adapted to the high strain rate of the titanium alloy material. In the disk edge area where the temperature of the titanium alloy disk blank 5 is higher, a smaller rolling forming downward pressure is set to adapt to the small deformation of the titanium alloy material, and a smaller rolling head rotation speed is set to adapt to the low strain rate of the titanium alloy material. The titanium alloy disk blank 5 can be obtained with an equiaxed fine-grained structure in the center area and a basket structure in the disk edge area, which has good formability and mechanical properties; the temperature field gradient difference in the middle transition zone of the titanium alloy disk blank 5 is appropriate, the transition interval is small, the organization is uniform, and there is no abnormal grain growth and mixed crystal distribution.

[0106] Unless otherwise defined, all technical and scientific terms used in this application are the same as those generally understood by those skilled in the art to which this application belongs. If there is any inconsistency, the meaning described in the full text of this application or the meaning derived from the content recorded in the full text of this application shall prevail. In addition, the terms used in this description are only for the purpose of describing the embodiments of the present application and are not intended to limit the present application.

[0107] Note that the above are only preferred embodiments of the present application and the technical principles used. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present application. Therefore, although the present application is described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may also include more other equivalent embodiments without departing from the technical concept of the present application, all of which belong to the protection scope of the present application.

[0108] The above description is only an embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structural transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for integrally forming a titanium alloy variable cross-section gradient structure dual-performance disk by rolling, characterized in that: The titanium alloy variable cross-section gradient structure dual-performance disk has a first annular groove spanning a portion of the disk center to the disk edge, a second annular groove located in the middle of the first annular groove, and a step ring structure located outside the disk edge. The forming method includes: Install the titanium alloy disc blank to the mandrel of the clamping part, and rotate the titanium alloy disc blank at a constant speed through the mandrel; The titanium alloy disc blank is heated, and the center area of ​​the titanium alloy disc blank is cooled at the same time, and the temperature of the titanium alloy disc blank from the center area to the edge area thereof is formed and maintained in a titanium alloy rolling forming temperature gradient interval, wherein the titanium alloy rolling forming temperature gradient interval is 850°C ± 10°C to 1000°C ± 10°C; According to the thickness of the titanium alloy disc blank, the first deformation ratio and the second deformation ratio, the first axial pressing amount in the disc center area and the second axial pressing amount in the disc edge area are set for each rolling process, wherein the first deformation ratio is in the range of 13.3% to 18.2%, and the second deformation ratio is in the range of 6.7% to 10%; According to the first axial downward pressure and the corresponding first and second rolling head speeds, and the second axial downward pressure and the corresponding third rolling head speed, the two sides of the titanium alloy disc blank are rolled in sequence from a specific position of the disc center area along the radial direction outward to form the first annular groove, wherein the first rolling head speed is 5r / min, the second rolling head speed is 4r / min, and the third rolling head speed is 3r / min; According to the first axial pressing amount and the second rolling head speed, the second axial pressing amount and the corresponding fourth rolling head speed, the two sides of the titanium alloy disc blank are sequentially pressed from a specific position of the transition zone along the radial direction outward to form the second annular groove, wherein the fourth rolling head speed is 2r / min; According to the second axial downward pressure and the fourth rolling head speed, the outer side of the disc edge of the titanium alloy disc blank is rolled to form the step ring; According to the preset heat treatment temperature and holding time range, the titanium alloy variable cross-section gradient organization dual-performance disk having the first ring groove, the second ring groove and the step ring structure is heat treated, and the titanium alloy variable cross-section gradient organization dual-performance disk that has undergone the heat treatment is water-cooled to room temperature, the preset heat treatment temperature is 875°C, and the holding time range is 1h to 1.5h.

2. The method for rolling and integrally forming a titanium alloy variable cross-section gradient structure dual-performance disk according to claim 1, characterized in that: According to the first axial downward pressure and the corresponding first and second rolling head speeds, and the second axial downward pressure and the corresponding third rolling head speed, rolling the two sides of the titanium alloy disc blank from a specific position in the disc center area along the radial direction outward is performed in sequence, and further includes: According to the first axial downward pressure and the first rolling head speed, rolling is performed on the center areas of both sides of the titanium alloy disc blank; According to the first axial downward pressure and the second rolling head speed, rolling is performed on the transition areas on both sides of the titanium alloy disc blank; According to the second axial downward pressure and the third rolling head rotation speed, the disk edge areas on both sides of the titanium alloy disk blank are rolled.

3. The method for rolling and integrally forming a titanium alloy variable cross-section gradient structure dual-performance disk according to claim 1, characterized in that: The method further comprises: rolling the two sides of the titanium alloy disc blank in sequence from a specific position of the transition zone along the radial direction outward according to the first axial downward pressure and the second rolling head speed, the second axial downward pressure and the corresponding fourth rolling head speed. According to the first axial downward pressure and the second rolling head speed, a portion of the transition zone inside the first annular groove is rolled; According to the second axial downward pressure and the fourth rolling head rotation speed, a partial area of ​​the disc edge region located inside the first annular groove is rolled.

4. The method for rolling and integrally forming a titanium alloy variable cross-section gradient structure dual-performance disk according to claim 1, characterized in that: The first axial downward pressure is equal to half of the product of the thickness of the titanium alloy disc blank and the first deformation ratio, wherein the thinner the thickness of the titanium alloy disc blank is, the larger the value of the first deformation ratio is.

5. The method for rolling and integrally forming a titanium alloy variable cross-section gradient structure dual-performance disk according to claim 4, characterized in that: The second axial downward pressing amount is equal to half of the product of the thickness of the titanium alloy disc blank and the second deformation ratio, wherein the thinner the thickness of the titanium alloy disc blank is, the larger the value of the second deformation ratio is.

6. The method for rolling and integrally forming a titanium alloy variable cross-section gradient structure dual-performance disk according to claim 1, characterized in that: The method of mounting the titanium alloy disc blank on the mandrel of the clamping part and rotating the titanium alloy disc blank at a uniform speed through the mandrel comprises: Two mandrels clamp the inner hole of the center of the titanium alloy disc blank, and an induction heating coil is arranged at both ends of the diameter of the titanium alloy disc blank, from the disc edge to the disc center, and a space matching the width of the rolling head is reserved between the two induction heating coils; According to the preset downward pressure and the preset rolling head speed, the multiple rolling heads attached to both sides of the titanium alloy disc blank are started to rotate, driving the titanium alloy disc blank to rotate at a uniform speed inside the induction heating coil, wherein the preset downward pressure is 1 mm, and the preset rolling head speed is 2 r / min.

7. The method for rolling and integrally forming a titanium alloy variable cross-section gradient structure dual-performance disk according to claim 6, characterized in that: The two mandrels clamp the inner hole of the center of the titanium alloy disk blank, and further include: The front ends of the two mandrels respectively pass through the inner holes of the disk center of the titanium alloy disk blank, wherein the interior of the mandrel is hollow and a rotary joint is inserted therein, and the rotary joint is externally connected to a water cooling system.

8. The method for rolling and integrally forming a titanium alloy variable cross-section gradient structure dual-performance disk according to claim 7, characterized in that: The step of heating the titanium alloy disc blank and cooling the center region of the titanium alloy disc blank simultaneously, and waiting for the temperature of the titanium alloy disc blank from the center region to the edge region thereof to form and maintain a titanium alloy rolling forming temperature gradient interval, further comprises: Adjusting the positions of the infrared temperature measuring devices at the center and the edge of the titanium alloy disk blank, and starting the induction heating power supply and the water cooling system; The temperature of the titanium alloy disc blank from the disc center area to the disc edge area is detected in real time by an infrared temperature measuring device, and after the temperature of the disc center area reaches a first preset temperature, the induction heating power and the water pressure of the water cooling system are adjusted so that the temperature of the titanium alloy disc blank is kept at a preset time, wherein the first preset temperature is 700° C.; The induction heating power and the water pressure of the water cooling system are adjusted to heat the titanium alloy disc blank again. After waiting for the temperature of the disc center area to reach the second preset temperature, the induction heating power and the water pressure of the water cooling system are adjusted again so that after the temperature of the titanium alloy disc blank is kept warm for the preset time, the temperature of the titanium alloy disc blank in the disc center area is 850°C±10°C, and the temperature in the disc edge area is 1000°C±10°C, thereby forming the titanium alloy rolling forming temperature gradient range, wherein the second preset temperature is 850°C, and the preset time is 30 minutes.

9. A rolling forming device for titanium alloy variable cross-section gradient structure dual-performance disk, characterized in that: include: A clamping part, comprising two mandrels, wherein the two mandrels are fixedly clamped at the inner holes of the disk center on both sides of the titanium alloy disk blank; An induction heating part, comprising two induction heating coils, which are arranged at both ends of the diameter of the titanium alloy disc blank, from the disc edge to the disc center, and a space matching the width of the rolling head is reserved between the two induction heating coils; The disk core water cooling part includes two rotary joints, the rotary joints are assembled inside the two core shafts, a cold water pipeline and a return water pipeline are arranged inside the rotary joints, and the rotary joints are externally connected to a water cooling system; A temperature measuring part, comprising two infrared temperature measuring devices, wherein the two infrared temperature measuring devices are respectively arranged in the disk center area and the disk edge area of ​​the titanium alloy disk blank; The rolling head moving part includes four rolling heads, a rotating motor connected to each of the rolling heads, an axial feeding device and a radial feeding device, and each two of the rolling heads are respectively arranged on both sides of the center of the titanium alloy disc blank on both sides thereof. The rolling heads roll the titanium alloy disc blank from the center area to the edge area of ​​the disc through the rotating motor, the axial feeding device and the radial feeding device.

10. A titanium alloy variable cross-section gradient structure dual-performance disk for aviation, characterized in that: It is formed by rolling the titanium alloy variable cross-section gradient dual-performance disk in one piece according to any one of claims 1 to 8 and using the equipment described in claim 9 to form a titanium alloy variable cross-section gradient dual-performance disk having a first annular groove spanning a portion of the disk center to the disk edge, a second annular groove located in the middle of the first annular groove, and a step ring structure located outside the disk edge.

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