Titanium alloy rotary body component forming process and method for controlling metal flow field of conical transition part of lower outlet of titanium alloy rotary body component
By controlling the metal flow field and heat treatment in stages, the problem of metal flow mismatch in the molding of titanium alloy swing body is solved, and efficient and high-quality forming effect is achieved, meeting the design requirements of titanium alloy swing body members.
Patent Information
- Application Number
- CN202510525062.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-24
- Publication Date
- 2025-07-25
AI Technical Summary
During the molding of titanium alloy swing body components, unreasonable metal flow field control leads to mismatch of metal flow velocity, which is prone to local dissatisfaction or excessive filling, resulting in eddy currents and turbulence, affecting the forming quality and efficiency.
A titanium alloy swing body member forming process is adopted to control the metal flow field in stages, design the position and time relationship of the minimum shunt node to ensure the reasonable distribution of metal during the composite extrusion process. The α+β-type titanium alloy material is used to control the extrusion temperature at α+β phase transition temperature ±100℃, and heat treatment is carried out.
It realizes efficient forming of titanium alloy swing body members, with smooth metal flow without eddy current, excellent molding quality, meets design requirements, excellent tensile performance, and meets the manufacturing standards of TC11 titanium alloy swing body members.
Smart Images
Figure CN120362280A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of titanium alloy component forming, and in particular to a titanium alloy rotating body component forming process and a metal flow field control method of a lower outlet conical transition part thereof. Background Art
[0002] A titanium alloy rotating body component Figure 1 As shown, the forging (i.e., the extruded blank 1 for machining titanium alloy rotating body components) has an upper outlet circular ring portion 6 and a lower hollow protrusion structure, and the lower hollow protrusion structure is a composite structure of a conical transition 7 and a circular protrusion 8.
[0003] When preparing / forming the titanium alloy rotating body component, the key process of its composite extrusion is mainly the metal flow field control, which directly affects the metal flow law and forming quality. When the metal diversion pre-design is unreasonable, it is easy to cause the flow speed of the upper outlet metal and the lower outlet metal to not match, resulting in local metal filling or excessive local metal transfer, metal flow eddy current or turbulence and other defects, so it is necessary to improve the process design or require multiple forming processes, which seriously affects the efficiency, manufacturing cycle and forming quality of the titanium alloy rotating body component. Summary of the invention
[0004] At least in view of the problems mentioned in the background technology, the present invention aims to provide a titanium alloy rotating body component forming process and a method for controlling the metal flow field of the lower outlet conical transition part.
[0005] The present invention adopts the following technical solution.
[0006] A method for controlling the metal flow field of a lower outlet conical transition portion during the forming of a titanium alloy rotating body component, wherein the titanium alloy rotating body component has an upper outlet circular ring portion and a lower hollow protrusion structure, wherein the lower hollow protrusion structure is a composite structure of a conical transition and a circular ring protrusion; the metal flow field during the forming of the titanium alloy rotating body component is in two stages: in the first stage, the blank metal flows simultaneously to the upper outlet circular ring portion and the lower outlet conical transition portion until the lower outlet conical transition portion is filled; in the second stage, the blank metal continues to flow simultaneously to the upper outlet circular ring portion and the lower outlet circular ring portion until the designed height of the circular ring portion is reached; In the first stage, the instantaneous height of the i-th minimum flow node from the upper surface of the blank is h iup =y i -(h0-h i ), the instantaneous height of the i-th minimum flow distribution node from the lower surface of the blank is h idown =h0-y i , calculate the transfer time Δt between two adjacent minimum diversion nodes i =t i -ti-1 The average instantaneous flow velocity of the metal in the part from the minimum shunt node of the combined extrusion to the upper outlet ring The average instantaneous flow velocity of the metal in the part from the minimum shunt node of the combined extrusion to the conical transition part of the lower outlet The volume V of the blank transferred by the punch drive during this period i And the volume V flowing upward to the upper outlet ring part simultaneously with the blank metal iup , The volume V of the conical transition part of the lower outlet idown The sum is equal, that is, V i =V iup +V idown , where Here, s0 is the initial area of the blank, s iup Is the instantaneous area of the metal from the minimum shunt node of the combined extrusion to the upper outlet, s idown Is the instantaneous area of the metal from the minimum shunt node of the combined extrusion to the conical transition part of the lower outlet, dt belongs to the time difference from t i To t i+1 ; Design the geometric structure of the conical transition part of the lower outlet according to the principle of equal volume.
[0007] In the present invention, in the first stage, the minimum shunt node is set near the edge of the blank; Assume that there are N minimum shunt node time-position coordinates P i (t i , y i ) distributed in the order of time alternation and along the height direction at the edge of the blank. t i Is the critical time of the i-th minimum shunt node, y i Is the initial height of the i-th minimum shunt node from the surface of the blank. Then the flow velocity of the i-th minimum shunt node at the critical time t i Is close to 0; At this time, the instantaneous deformation height h of the blank i =h0 - v0t i , h0 is the original height of the blank, v0 is the downward speed of the punch; Design the time-position coordinates P of the minimum shunt node at the beginning of the combined extrusion deformation in the first stage start (t0, y s ) and the time-position coordinates P of the minimum shunt node when the conical transition part is deformed end (t e , y e ), where t0 is the critical time at the beginning of the deformation, t e Is the critical time when the conical transition part is deformed, y s Is the initial height of the minimum shunt node from the surface of the blank at the beginning of the deformation, y eis the initial height of the minimum shunt node from the billet surface when the conical transition part is deformed, and it satisfies where g0 is the designed thickness of the intermediate web of the forging; at this time, the instantaneous deformation height of the corresponding billet is h e = g0 + g1, and the calculated time Furthermore, the initial height y of the i-th minimum shunt node from the billet surface is established i and the characterization relationship with the critical time t i is y i = f(t i ).
[0008] Based on the foregoing metal flow field control method, a forming process for a titanium alloy rotary body component provided by the present invention includes the following steps: Step 1, perform a pre-design of volume distribution according to the structure of the titanium alloy rotary body component; wherein, the forging of the titanium alloy rotary body component has an upper outlet ring part and a lower end hollow protruding structure, and the lower end hollow protruding structure is a composite structure of a conical transition and a ring protrusion. The forging refers to a billet for machining the titanium alloy rotary body component formed by extrusion; Step 2, combine the obtained volume distribution pre-design scheme to perform a pre-design of metal shunting to obtain a metal shunting pre-design scheme; Step 3, combine the obtained metal shunting pre-design scheme to perform a flow matching structure design, and give a composite extrusion forming scheme for the titanium alloy rotary body component; this step is the key design stage of metal shunting for flow matching structure design. At this stage, the flow velocities of the metal in the upper ring outlet part and the metal in the lower outlet conical transition part are different; Among them, the composite extrusion forming is designed in two stages: in the first stage, the billet metal flows simultaneously to the upper outlet ring part and the lower outlet conical transition part until the filling of the lower outlet conical transition part is completed; in the second stage, the billet metal continues to flow simultaneously to the upper outlet ring part and the lower outlet ring part until the designed height of the ring part is reached; Among them, the steps of the volume distribution pre-design include: Control the volume ratio η of the metal in the lower outlet ring part and the metal in the upper outlet ring part in the second stage according to formula (1), In the formula, d 1down is the outer diameter of the lower outlet ring part, d 2down is the inner diameter of the lower outlet ring part, d 1up is the outer diameter of the upper outlet ring part, d 2up is the inner diameter of the upper outlet ring part. The metal in the lower outlet ring part refers to the metal in the corresponding cavity of the lower outlet ring part; According to the equal - volume principle and Equation (2), determine the height of the blank consumed by metal transfer when the deformation in the second stage is completed. In the formula, L0 is the filling height of the outlet ring part in this stage, and L1 is the filling height of the upper - outlet ring part in this stage. Among them, the steps of pre - designing metal flow - splitting include: In the first - stage compound extrusion deformation process, the minimum flow - splitting node is set near the edge of the blank. Assume that there are N minimum flow - splitting node time - position coordinates P i (t i ,y i ) existing at the edge of the blank, distributed in the order of time alternation and along the height direction. t i is the critical time of the i - th minimum flow - splitting node, and y i is the initial height of the i - th minimum flow - splitting node from the surface of the blank. Then the flow velocity of the i - th minimum flow - splitting node at the critical time t i is close to 0. At this time, the instantaneous deformation height h i = h0 - v0t i , where h0 is the original height of the blank and v0 is the downward speed of the punch. Design the time - position coordinate P start (t0,y s ) of the minimum flow - splitting node at the beginning of the first - stage compound extrusion deformation and the time - position coordinate P end (t e ,y e ) of the minimum flow - splitting node when the deformation of the conical transition part is completed. Among them, t0 is the critical time at the beginning of the deformation, t e is the critical time when the deformation of the conical transition part is completed, y s is the initial height of the minimum flow - splitting node from the surface of the blank at the beginning of the deformation, and y e is the initial height of the minimum flow - splitting node from the surface of the blank when the deformation of the conical transition part is completed, which satisfies Here, g0 is the designed thickness of the intermediate web of the forging (i.e., the bottom thickness of the middle part of the forging). At this time, the corresponding instantaneous deformation height of the blank is h e = g0 + g1, and the time is calculated. Further establish the characterization relationship between the initial height y i of the i - th minimum flow - splitting node from the surface of the blank and the critical time t i as y i = f(t i ); Among them, the steps of designing the flow - rate matching structure include: During the first-stage compound extrusion deformation process, the instantaneous height of the i-th minimum flow-dividing node from the upper surface of the blank is h iup = y i -(h0 - h i ), and the instantaneous height of the i-th minimum flow-dividing node from the lower surface of the blank is h idown = h0 - y i . Calculate the transfer time Δt of two adjacent minimum flow-dividing nodes i = t i - t i-1 . Then, the average instantaneous flow velocity of the metal from the minimum flow-dividing node of the compound extrusion to the upper outlet circular ring part The average instantaneous flow velocity of the metal from the minimum flow-dividing node of the compound extrusion to the lower outlet conical transition part is From t i to t i+1 in the time period (the differential time period of discrete design), the volume V transferred by the punch driving the blank i is equal to the sum of the volume V iup of the blank metal flowing simultaneously to the upper outlet circular ring part and the volume V idown flowing to the lower outlet conical transition part, that is, V i = V iup + V idown , where Here, s0 is the initial area of the blank, s iup is the instantaneous area of the metal from the minimum flow-dividing node of the compound extrusion to the upper outlet, and s idown is the instantaneous area of the metal from the minimum flow-dividing node of the compound extrusion to the lower outlet conical transition part; d t represents the time interval for calculus calculation, which is the time difference from t i to t i+1 ; According to the principle of equal volume, design the geometric structure of the lower outlet conical transition part, and finally obtain the forging drawing; Step 4: Perform extrusion forming according to the obtained forging drawing, and then carry out machining and heat treatment to obtain the titanium alloy rotary body component.
[0009] In the present invention, the raw material of the titanium alloy rotary body component is α + β type titanium alloy, the extrusion forming temperature is α + β phase transformation temperature ±100 °C, the first annealing temperature during the heat treatment process is 50 °C ± 10 °C below the α + β phase transformation temperature and the holding time is 2 h ± 0.5 h, and the second annealing temperature during the heat treatment process is 500 °C to 550 °C and the holding time is 6 h ± 0.5 h.
[0010] Beneficial effects: By comparing the deformation law of the minimum shunting node in the solution of the present invention and the simulation analysis, it can be found that the relationships between the initial position of the shunting node and the critical time, and between the instantaneous height of the blank and the initial position of the shunting node in the present invention have high accuracy, indicating that the method of the present invention has good accuracy. For the TC11 titanium alloy rotary forging formed by the process of the present invention, its room-temperature tensile properties are tested as Rm (1030 - 1230) MPa, Rp0.2 ≥ 885 MPa, A ≥ 8%, and Z ≥ 23%, meeting the design and manufacturing requirements of titanium alloy rotary components. Description of the Drawings
[0011] Figure 1 It is a schematic diagram of the titanium alloy rotary component and its forging in Example 1; Figure 2 It is a schematic diagram of the unreasonable pre-design of metal shunting in the titanium alloy rotary component in the prior art; Figure 3 It is a schematic diagram showing that the metal flow resistance of the lower hollow annular structure of the titanium alloy rotary component in the prior art is small and the volume transfer is large; Figure 4 It is a schematic diagram showing that the metal in the upper hollow annular structure of the titanium alloy rotary component in the prior art generates eddy currents and flows downward in a reverse direction; Figure 5 It is a schematic diagram of the geometric relationship between the die and the blank in Example 1; Figure 6 It is a schematic diagram of the associated model of the minimum shunting node in compound extrusion in Example 1; Figure 7 It is an analysis diagram of the deformation of the minimum shunting node at the start of deformation in Example 1. In the figure, part a corresponds to a blank height of 28 mm and a circular lower die outlet; part b corresponds to a blank height of 28 mm and a conical lower die outlet; Figure 8 It is a simulation analysis diagram of the titanium alloy rotary component in Example 1; Figure 9 It is a diagram of the tracking of the initial position of the inserted node during the simulation process; Figure 10 It is a diagram of the data of the axial velocity and time of the inserted node during the simulation process; Figure 11 It is a diagram of the relationship between the starting position and the minimum velocity of the inserted node during the simulation process; Figure 12 It is a diagram of the relationship between the initial position of the shunting node and the critical time (comparison between Example 1 and simulation); Figure 13Relationship diagram between the instantaneous height of the blank and the initial position of the shunting node (comparison between Example 1 and simulation); Reference numerals: 1 - forging of the titanium alloy rotary member, 2 - titanium alloy rotary member, 3 - punch, 4 - die, 5 - blank, 6 - upper outlet ring part, 7 - tapered transition (structure), 8 - ring protrusion (structure), including 9 - center of the instantaneous blank height, 10 - blank height required for metal transfer when the second-stage deformation is completed ( Figure 6 in this g1 height region). Specific implementation mode
[0012] The technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention. Example 1
[0013] The structures of a certain titanium alloy rotary member 2 and its forging 1 are as Figure 1 shown. After the forging 1 is formed by extrusion, it is machined into the titanium alloy rotary member 2. The forging 1 has an upper outlet ring part 6 and a lower hollow protruding structure at the lower end. The lower hollow protruding structure is a composite structure of a tapered transition 7 and a ring protrusion 8. In order to realize the one-step forming of the forging 1 of the titanium alloy rotary member 2, the composite extrusion forming is designed in two stages. In the first stage, the metal of the blank flows simultaneously to the upper outlet ring part and the lower outlet tapered transition part until the filling of the lower outlet tapered transition part is completed. In the second stage, the metal of the blank continues to flow simultaneously to the upper outlet ring part and the lower outlet ring part until the designed height of the ring part is reached.
[0014] In this example, the shunting design method for the composite extrusion of the titanium alloy rotary member (substantially extruding the forging 1 corresponding to the titanium alloy rotary member 2): Step 1, perform a preliminary volume distribution design according to the structure of the titanium alloy rotary member; wherein, the forging 1 of the titanium alloy rotary member 2 has an upper outlet ring part 6 and a lower hollow protruding structure 7 at the lower end. The upper outlet ring part 6 is a ring, and the lower hollow protruding structure is a composite structure of a tapered transition 7 and a ring protrusion 8. Step 2, perform a preliminary metal shunting design in combination with the obtained volume distribution preliminary design scheme. Step 3, perform a flow matching structure design in combination with the obtained metal shunting preliminary design scheme, and give the composite extrusion forming scheme for the titanium alloy rotary member. Among them, Step 2 can be understood as the preliminary metal shunting design stage of the flow matching structure design (volume pre-distribution, at this stage, the metal flow rates at the upper and lower ring outlet parts are basically the same), and Step 3 can be understood as the key metal shunting design stage of the flow matching structure design (volume regulation, at this stage, the metal flow rates at the upper ring outlet part and the lower outlet tapered transition part are different). Specifically as follows.
[0015] Steps for pre-designing volume distribution in this example: Combine Figure 5 As shown, design the outer diameter d of the lower outlet ring part of forging 1 1down to be 116 mm, the inner diameter d of the lower outlet ring part 2down to be 94 mm, the outer diameter d of the upper outlet ring part 1up to be 125 mm, and the inner diameter d of the upper outlet ring part 2up to be 103 mm. Calculate the volume ratio of the metal in the lower outlet ring part and the metal in the upper outlet ring part under combined extrusion when the second-stage deformation is completed to be 0.92. At the same time, design the filling height L0 of the lower outlet ring part in this stage to be 11 mm and the filling height L1 of the upper outlet ring part to be 6 mm. Calculate the billet height required for metal transfer when the second-stage deformation is completed according to the equal-volume principle to be 7.63 mm.
[0016] Steps for pre-designing metal flow splitting in this example: Combine Figure 6 As shown, during the first-stage combined extrusion deformation process, the minimum flow splitting node is at the edge of the billet ( Figure 6 the outermost vertical line in, and there are many horizontal lines on this line, and these horizontal lines represent transient flow splitting points), and it gradually approaches the instantaneous billet height center 9 as the deformation progresses. The instantaneous billet height center 9 is transiently changing and finally near Pg, that is, at g2 = 0.5g0. 10 represents the billet height required for metal transfer when the second-stage deformation is completed ( Figure 6 in this g1 height region); Assume that there are N minimum flow splitting node time-position coordinates P i (t i , y i ) distributed in the billet edge according to the time-alternating order and along the height direction. t i is the critical time of the i-th minimum flow splitting node, and y i is the initial height of the i-th minimum flow splitting node from the billet surface. Then the flow velocity of the i-th minimum flow splitting node at the critical time t i is close to 0. At this time, the instantaneous deformation height h i = h0 - v0t i , where h0 is the original height of the billet and is designed to be 28 mm, and v0 is the downward speed of the punch and is designed to be 10 mm / s; Design the time-position coordinate P start (t0, y s ) of the minimum flow splitting node at the start of the first-stage combined extrusion deformation and the time-position coordinate P end(t e , y e ), where t0 is the critical time when the deformation starts and its value is 0, t e is the critical time when the deformation of the conical transition part is completed, y s is the initial height of the minimum flow splitting node from the billet surface at the start of deformation. After analysis and design, y s is 6 mm (as shown in Figure 7 ), y e is the initial height of the minimum flow splitting node from the billet surface when the deformation of the conical transition part is completed, and it satisfies Here, g0 is the thickness of the intermediate web of the forging and is designed to be 11.5 mm (the height of g0 in the web, i.e., the bottom thickness of the intermediate part of the forging). Then, by calculation, y Figure 6 is 14.62 mm. At this time, the instantaneous deformation height h e of the corresponding billet is h e = g0 + g1 = 19.13 mm, and the calculated time is 0.887 s; Further, by linear fitting, the characterization relationship of P start (t0, y s ), P end (t e , y e ) is obtained as y i = 6 + 9.72t i . Assuming that the value of N nodes is 30, the initial height y i of each minimum flow splitting node from the billet surface and the instantaneous deformation height h i of the billet are calculated as shown in Table 1; Table 1 Related values of the minimum flow splitting node during the first-stage combined extrusion deformation
[0017] Steps for designing the flow matching structure in this example: During the first-stage combined extrusion deformation, the instantaneous height h iup of the i-th minimum flow splitting node from the upper surface of the billet is h i = y i - (h0 - h idown ), and the instantaneous height h i from the lower surface of the billet is h i = h0 - y i - t i-1 . Calculate the transfer time Δt Average instantaneous flow velocity of metal in the tapered transition section from the minimum shunt node to the lower outlet in compound extrusion The volume V of the blank transferred by the punch during this period i Is equal to the sum of the volume V flowing upward to the upper outlet ring part and the volume V of the lower outlet tapered transition part at the same time as the blank metal, that is, V iup 、V idown That is, V i =V iup +V idown , where Here, s0 is the initial area of the blank, s iup Is the instantaneous area of the metal from the minimum shunt node of the compound extrusion to the upper outlet, and s idown Is the instantaneous area of the metal from the minimum shunt node of the compound extrusion to the tapered transition section of the lower outlet; According to the principle of equal volume, design the geometric structure of the tapered transition section at the lower outlet of the compound extrusion (the geometric shape of the tapered transition section can be designed through iterative optimization of 3D modeling software; finally, the forging drawing can be obtained, which can ensure reasonable metal shunting during the forming process and achieve the designed structure of the forging in one integral forming); Step 4: Perform extrusion forming according to the obtained forging drawing, and then perform machining and heat treatment to obtain a titanium alloy rotary body component; in this example, the raw material of the titanium alloy rotary body component is α+β type titanium alloy, the extrusion forming temperature is α+β phase transformation temperature ±100°C, the first annealing temperature during the heat treatment process is 50°C±10°C below the α+β phase transformation temperature, and the holding time is 2h±0.5h. The second annealing temperature during the heat treatment process is 500°C~550°C, and the holding time is 6h±0.5h.
[0018] The simulation test method is used to verify and optimize the forging shape of the designed titanium alloy rotary body component and the compound extrusion shunt design method. The simulation process shows good metal filling (as Figure 8 Shown), no eddy current and turbulence phenomena, and reasonable metal volume distribution at the upper and lower outlet parts of the forging. Interpolate 21 nodes at the edge of the blank (as Figure 9 Shown) to track and analyze the simulation process (as Figure 10 Shown), it can be found that the minimum velocity of the 6-12th interpolation node tends to 0 (as Figure 11 Shown), which is the minimum shunt node. Comparing the deformation law of the minimum shunt node calculated in this example and the simulation analysis, it can be found that the accuracy of the relationship between the initial position of the shunt node and the critical time, and the instantaneous height of the blank and the initial position of the shunt node is high (as Figure 12 And Figure 13 Shown), indicating that the shunt design method is feasible.
Claims
1. A method for controlling the metal flow field in the lower outlet conical transition part during the forming of a titanium alloy rotary body component, characterized in that, The titanium alloy rotary body component has an upper outlet ring part and a lower end hollow protruding structure, and the lower end hollow protruding structure is a composite structure of conical transition and ring protrusion; the metal flow field during the forming of the titanium alloy rotary body component has two stages: in the first stage, the blank metal flows simultaneously to the upper outlet ring part and the lower outlet conical transition part until the filling of the lower outlet conical transition part is completed; in the second stage, the blank metal continues to flow simultaneously to the upper outlet ring part and the lower outlet ring part until the designed height of the ring part is reached; among them, In the first stage, the instantaneous height of the i-th minimum flow-splitting node from the upper surface of the blank is h iup = y i -(h0 - h i ), the instantaneous height of the i-th minimum flow-splitting node from the lower surface of the blank is h idown = h0 - y i , calculate the transfer time Δt of two adjacent minimum flow-splitting nodes i = t i - t i-1 , then the average instantaneous flow velocity of the metal in the part from the minimum flow-splitting node of the compound extrusion to the upper outlet ring The average instantaneous flow velocity of the metal in the part from the minimum flow-splitting node of the compound extrusion to the conical transition part of the lower outlet The volume V of the punch driving the blank transfer during this period i is equal to the sum of the volume V flowing upward to the upper outlet ring part and the volume V of the lower outlet conical transition part simultaneously with the blank metal, that is, V iup idown i = V iup + V idown where Here, s0 is the initial area of the blank, s iup is the instantaneous area of the metal from the minimum shunting node of the compound extrusion to the upper outlet, and s idown is the instantaneous area of the metal from the minimum shunting node of the compound extrusion to the lower outlet conical transition part. dt belongs to the time difference from t i to t i+1 ; According to the principle of equal volume, the geometric structure of the lower outlet conical transition part is designed.
2. The method according to claim 1, wherein: In the first stage, the minimum shunt node is arranged near the blank edge; Assume that there are N minimum shunt node time - position coordinates P distributed in the order of time alternation and along the height direction at the edge of the blank i (t i , y i ), where t i is the critical time of the i - th minimum shunt node, and y i is the initial height of the i - th minimum shunt node from the surface of the blank. Then the flow velocity of the i - th minimum shunt node at the critical time t i is close to 0; at this time, the instantaneous deformation height h i = h0 - v0t i , where h0 is the original height of the blank and v0 is the downward speed of the punch The time-position coordinate P of the minimum shunt node at the start of the combined extrusion deformation in the first stage of the design start (t0, y s ) and the time-position coordinate P of the minimum shunt node at the completion of the deformation of the tapered transition part end (t e , y e ), where t0 is the critical time at the start of the deformation, t e is the critical time at the completion of the deformation of the tapered transition part, and y s is the initial height of the minimum shunt node from the blank surface at the start of the deformation, and y e is the initial height of the minimum shunt node from the blank surface at the completion of the deformation of the tapered transition part, and it satisfies where g0 is the designed thickness of the intermediate web of the forging; at this time, the instantaneous deformation height of the blank is h e = g0 + g1, and the calculated time Further establish the initial height y of the i-th minimum shunt node from the billet surface i and the critical time t i The characterization relationship is y i = f(t i ).
3. A forming process for a titanium alloy rotary body component, characterized in that the steps Including: Step 1, perform a pre-design of volume distribution according to the structure of the titanium alloy rotary body component; among them, the forging of the titanium alloy rotary body component has an upper outlet ring part and a lower end hollow protruding structure, and the lower end hollow protruding structure is a composite structure of conical transition and ring protrusion, and the forging refers to the blank for machining the titanium alloy rotary body component formed by extrusion; Step 2, combine the obtained pre-design scheme of volume distribution to perform a pre-design of metal shunting to obtain a pre-design scheme of metal shunting; Step 3, combine the obtained pre-design scheme of metal shunting to perform a flow matching structure design and give a composite extrusion forming scheme for the titanium alloy rotary body component; Among them, the composite extrusion forming is designed in two stages: in the first stage, the blank metal flows simultaneously to the upper outlet ring part and the lower outlet conical transition part until the filling of the lower outlet conical transition part is completed; in the second stage, the blank metal continues to flow simultaneously to the upper outlet ring part and the lower outlet ring part until the designed height of the ring part is reached; Among them, the steps of the pre-design of volume distribution include: Control the volume ratio η of the metal in the lower outlet ring part and the metal in the upper outlet ring part in the second stage according to formula (1), where d 1down is the outer diameter of the lower outlet ring part, d 2down is the inner diameter of the lower outlet ring part, d 1up is the outer diameter of the upper outlet ring part, d 2up is the inner diameter of the upper outlet ring part. The metal of the lower outlet ring part refers to the metal in the corresponding cavity of the lower outlet ring part; Determine the blank height required for metal transfer during the completion of deformation in the second stage according to the principle of equal volume and formula (2), In the formula, L0 is the filling height of the lower outlet ring part in this stage, and L1 is the filling height of the upper outlet ring part in this stage; Among them, the steps of the pre-design of metal shunting include: During the first-stage composite extrusion deformation process, the minimum shunt node is arranged near the blank edge; Assume that there are N minimum shunt node time - position coordinates P distributed in the order of time alternation and along the height direction at the edge of the blank i (t i , y i ), where t i is the critical time of the i - th minimum shunt node, and y i is the initial height of the i - th minimum shunt node from the surface of the blank. Then the flow velocity of the i - th minimum shunt node at the critical time t i is close to 0; at this time, the instantaneous deformation height h i = h0 - v0t i , where h0 is the original height of the blank and v0 is the downward speed of the punch; Design the time-position coordinates P of the minimum shunt node at the start of the first-stage compound extrusion deformation start (t0, y s ) and the time-position coordinates P of the minimum shunt node when the deformation of the conical transition part is completed end (t e , y e ), where t0 is the critical time at the start of the deformation, t e is the critical time when the deformation of the conical transition part is completed, and y s is the initial height of the minimum shunt node from the blank surface at the start of the deformation, and y e is the initial height of the minimum shunt node from the blank surface when the deformation of the conical transition part is completed, and it satisfies Here, g0 is the designed thickness of the intermediate web of the forging; at this time, the instantaneous deformation height of the blank is h e = g0 + g1, and the calculated time Furthermore, the characterization relationship between the initial height y i of the i-th minimum shunt node from the blank surface and the critical time t i is y i = f(t i ); Among them, the steps of the flow matching structure design include: During the first-stage combined extrusion deformation process, the instantaneous height of the i-th minimum flow-dividing node from the upper surface of the blank is h iup = y i -(h0 - h i ), and the instantaneous height of the i-th minimum flow-dividing node from the lower surface of the blank is h idown = h0 - y i , calculate the transfer time Δt of two adjacent minimum flow-dividing nodes i = t i - t i-1 , then the average instantaneous flow velocity of the metal in the ring part from the minimum flow-dividing node of the combined extrusion to the upper outlet The average instantaneous flow velocity of the metal in the tapered transition part from the minimum flow-dividing node of the combined extrusion to the lower outlet is From t i to t i+1 During this time period, the volume V i by which the punch drives the blank transfer is equal to the sum of the volume V iup of the blank metal flowing into the upper outlet circular ring part and the volume V idown flowing into the lower outlet conical transition part, i.e., V i = V iup + V idown , where s0 is the initial area of the blank, s iup is the instantaneous area of the metal from the minimum diversion node of the compound extrusion to the upper outlet, and s idown is the instantaneous area of the metal from the minimum diversion node of the compound extrusion to the lower outlet conical transition part; d t represents the time interval for the calculus calculation and is the time difference from t i to t i+1 . According to the principle of equal volume, design the geometric structure of the lower outlet conical transition part to finally obtain a forging drawing; Step 4, perform extrusion forming according to the obtained forging drawing, and then perform machining and heat treatment to obtain the titanium alloy rotary body component.
4. The forming process of the titanium alloy rotary body component according to claim 1, wherein: The raw material of the titanium alloy rotary body component is α+β type titanium alloy, the extrusion forming temperature is α+β phase transformation temperature ±100°C, the first annealing temperature during the heat treatment process is 50°C ± 10°C below the α+β phase transformation temperature and the holding time is 2h ± 0.5h, and the second annealing temperature during the heat treatment process is 500°C to 550°C and the holding time is 6h ± 0.5h.