An ultra-high load titanium alloy rotary body forging die and a forging forming method

Abstract

The application discloses a kind of superhigh load titanium alloy rotary body forge piece mould and forging forming method, mainly related to the plastic processing field of superlarge size forge piece forging forming, wherein, forge piece mould is made of pre-forging upper die, final-forging upper die group and bottom die;Forging forming mainly includes three steps of preparation pie-shaped blank, pre-forging and final-forging.The forging die of the application is simple in structure, easy to operate, and can effectively reduce the equipment pressure required for forging superlarge size titanium alloy rotary body forge piece;The forging method using the forging die of the application can greatly improve the filling capacity of the forge piece, produce superhigh load forge piece with low tonnage equipment, and obtain superlarge size titanium alloy rotary body forge piece with size and performance meeting the design requirements.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of super large size forging forming plasticity of titanium alloy, and particularly relates to a super high load titanium alloy rotary body forging die and a forging forming method. BACKGROUND

[0002] Titanium alloy material has large deformation resistance, in the prior art, the super large size titanium alloy rotary body forging with a projection area greater than 1m 2 2 requires a high load on the forging equipment, and generally needs to use a forging equipment with a tonnage of more than 5MN for production, and currently, there are few enterprises in China that have such tonnage forging equipment. With the rapid development of the aviation industry in China, the demand for super large size titanium alloy forgings at the type design level is gradually increasing, and the simple and extensive method of continuously improving the tonnage of equipment to carry out the production of super large size titanium alloy forgings has been unable to meet the current efficient, innovative and green production mode of the industry. SUMMARY

[0003] Based on the above problems, the purpose of the present application is to provide a super high load titanium alloy rotary body forging die and a forging forming method, and the present application adopts the following technical scheme:

[0004] The present application provides a super high load titanium alloy rotary body forging die, which comprises a pre-forging upper die, a final-forging upper die set and a bottom die; the bottom surface of the pre-forging upper die is provided with a pre-forging upper cavity; the final-forging upper die set comprises a die frame, the bottom of the die frame is provided with a rotatable final-forging upper die, and the bottom surface of the final-forging upper die is provided with a final-forging upper cavity; and the top surface of the bottom die is provided with a forging lower cavity.

[0005] In use, firstly, the forging lower cavity can be used in combination with the pre-forging upper cavity, and can also be used in combination with the final-forging upper cavity; when the pre-forging upper cavity and the forging lower cavity are used in combination, a pie-shaped blank can be processed into a pre-forging blank; when the forging lower cavity and the final-forging upper cavity are used in combination, the pre-forging blank can be processed into a final-forging piece by controlling the final-forging upper die to follow the cycle forging method of pressing upward rotation pressing.

[0006] Preferably, an annular track groove is arranged on the outer wall of the die frame, and a plurality of connecting grooves are uniformly arranged in an annular shape on the outer wall of the final-forging upper die.

[0007] A plurality of groove-type connecting pieces are arranged on the outer side of the annular track groove, each groove-type connecting piece corresponds to each connecting groove one by one, one end of the groove-type connecting piece extends into the connecting groove, and the other end extends into the annular track groove.

[0008] Preferably, a driving rod is arranged on the outer side of the groove-type connecting piece.

[0009] Preferably, a ball bearing is arranged between the groove-shaped connector and the annular track groove.

[0010] Preferably, a plurality of rotating mark positions are evenly distributed on the outer wall of the die frame, and a positioning mark position is arranged on the outer wall of the finish-forging upper die.

[0011] Preferably, a plurality of guide bosses are evenly distributed around the finish-forging upper cavity, and each guide boss is arranged on the bottom surface of the finish-forging upper die; a plurality of guide grooves are evenly distributed around the forging lower cavity, and each guide groove is arranged on the top surface of the bottom die, the number of the guide grooves is the same as that of the guide bosses, and the guide grooves and the guide bosses are embeddedly matched.

[0012] Preferably, two guide sliding rods are arranged on the pre-forging upper die, and two guide sliding holes are arranged on the bottom die, and when the pre-forging upper die is used in combination with the bottom die, the guide sliding rods are embedded into the corresponding guide sliding holes.

[0013] Preferably, a material-ejecting rod hole is arranged at the bottom of the forging lower cavity, and a material-ejecting rod is arranged in the material-ejecting rod hole.

[0014] The application further provides a method for forging forming of an ultra-high load titanium alloy rotary body, comprising the above-mentioned ultra-high load titanium alloy rotary body forging die, and the method comprises the following steps:

[0015] Step one, preparing a pie-shaped blank, using a large flat die to perform multi-fire pie-up forging on a bar material to prepare a pie-shaped blank;

[0016] Step two, pre-forging, placing the pie-shaped blank in the pre-forging upper die and the bottom die, so that the pie-shaped blank is pre-forged in the pre-forging upper cavity and the forging lower cavity used in combination for multiple times to prepare a pre-forged blank;

[0017] Step three, finish-forging, placing the pre-forged blank in the finish-forging upper die and the bottom die, so that the pre-forged blank is prepared into a finish-forged piece in the finish-forging upper cavity and the forging lower cavity used in combination by controlling the finish-forging upper die to follow a cycle forging mode of pressing-lifting-rotating-pressing.

[0018] Preferably, in the step one, the end surface of the bar material is milled to ensure that the perpendicularity of the end surfaces of the bar material to the axis is ≤0.5, the roughness is ≤Ra6.3, and the edge chamfer is R30~R50; the bar material cut according to the process requirement is heated in an electric furnace, and the heating temperature is selected in the range of (30~50)℃. β

[0019] ​In the step two, the cake blank is preheated, the preheating temperature is controlled at 100-200 DEG C, and the temperature is kept for 20-30 minutes; the cake blank is taken out and the whole surface is sprayed with titanium alloy special forging lubricant; after the spraying, the cake blank is placed in an electric furnace for heating, the heating temperature is at T β - (30-50) ℃ is selected; meanwhile, the pre-forging upper die and the bottom die are heated in a heating furnace in advance;

[0020] In the step three, the pre-forging blank is preheated, the preheating temperature is controlled at 100-200 DEG C, and the temperature is kept for 20-30 minutes; the pre-forging blank is taken out and the whole surface is sprayed with titanium alloy special forging lubricant; then the pre-forging blank is placed in an electric furnace for heating, the heating temperature is at T β - (30-50) ℃ is selected, the heating time is calculated according to 0.6-0.7 min / mm, and after the pre-forging blank is heated to the final holding time, an aluminum silicate fiber felt soft packing cover is used, the pre-forging blank is placed in the furnace after being covered, and is kept for 30-45 minutes after being heated to the temperature and is taken out for forging; meanwhile, the final-forging upper die and the bottom die (3) are heated in a heating furnace in advance.

[0021] Compared with the prior art, the beneficial technical effects of the present application are:

[0022] The forging die of the present application has simple structure and is easy to operate, and can effectively reduce the equipment pressure required for forging the super-large-size titanium alloy rotary body forging; the forging method using the forging die of the present application can greatly improve the filling capacity of the forging, and can produce super-high-load forgings by low-tonnage equipment, and obtain super-large-size titanium alloy rotary body forgings meeting the design requirements in size and performance. BRIEF DESCRIPTION OF DRAWINGS

[0023] The present application will be further described below in combination with the drawings.

[0024] Figure 1 It is a structure schematic view of the super-high-load titanium alloy rotary body forging die in the first embodiment of the present application.

[0025] Figure 2 It is a sectional view of the pre-forging upper die and the bottom die in cooperation in the first embodiment of the present application.

[0026] Figure 3 It is a structure schematic view of the final-forging upper die set and the bottom die in cooperation in the first embodiment of the present application.

[0027] Figure 4 It is a sectional view of the final-forging upper die set and the bottom die in cooperation in the first embodiment of the present application.

[0028] Figure 5 It is a structure schematic view of the groove type connecting piece in the first embodiment of the present application.

[0029] Figure 6 For the embodiment one of the present application Figure 4 The local enlarged view at A in the embodiment one of the present application;

[0030] Figure 7 The structure schematic view of the rotating mark position and the positioning mark position in the final forging upper die set in the embodiment one of the present application;

[0031] Figure 8 The cooperation structure schematic view of the rotating mark position and the positioning mark position in the embodiment one of the present application;

[0032] Figure 9 The top surface structure schematic view of the final forging piece in the embodiment one of the present application;

[0033] Figure 10 The bottom surface structure schematic view of the final forging piece in the embodiment one of the present application;

[0034] Figure 11 The structure schematic view of the pre-forging upper cavity in the embodiment one of the present application;

[0035] Figure 12 The structure schematic view of the final forging upper cavity in the embodiment one of the present application;

[0036] Figure 13 The structure schematic view of the forging lower cavity in the embodiment one of the present application;

[0037] Figure 14 The structure schematic view of the pie-shaped blank in the embodiment one of the present application;

[0038] Figure 15 The top surface structure schematic view of the final forging piece in the embodiment one of the present application;

[0039] Figure 16 The low-magnification structure view of the super-high load titanium alloy rotary body in the embodiment two of the present application;

[0040] Figure 17 The microstructure view of the super-high load titanium alloy rotary body in the embodiment two of the present application.

[0041] Explanation of the reference numerals: 1, pre-forging upper die; 101, pre-forging upper cavity; 102, pre-forging groove; 2, final forging upper die set; 201, die frame; 202, final forging upper die; 203, final forging upper cavity; 204, guide boss; 205, final forging protrusion; 206, final forging groove; 3, bottom die; 301, forging lower cavity; 302, guide groove; 303, bottom die cavity groove; 4, annular track groove; 5, connecting groove; 6, groove type connecting piece; 7, driving rod; 8, ball; 9, rotating mark position; 10, positioning mark position; 11, guide sliding rod; 12, guide sliding hole; 13, ejector rod; 14, pie-shaped blank; 15, pre-forging blank; 16, final forging piece; 1601, forging piece groove; 1602, forging piece protrusion. Detailed Implementation

[0042] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0043] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0044] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0045] Example 1

[0046] like Figure 1 As shown in the figure, this embodiment discloses an ultra-high load titanium alloy rotating body forging mold. The forging mold structure consists of three parts, including a pre-forging upper mold 1, a final forging upper mold group 2, and a bottom mold 3.

[0047] Specifically, the bottom surface of the pre-forging upper die 1 is provided with a pre-forging upper cavity 101. The final forging upper die assembly 2 includes a die frame 201, the bottom of which is provided with a rotatable final forging upper die 202, and the bottom surface of the final forging upper die 202 is provided with a final forging upper cavity 203. The top surface of the bottom die 3 is provided with a forging lower cavity 301.

[0048] In use, the lower forging cavity 301 can be used in conjunction with both the pre-forging upper cavity 101 and the final forging upper cavity 203. When the pre-forging upper cavity 101 and the lower forging cavity 301 are used together, the disc-shaped billet 14 can be processed into a pre-forged billet 15. When the lower forging cavity 301 and the final forging upper cavity 203 are used together, by controlling the final forging upper die 202 according to the cyclic forging method of "pressing-lifting-rotating-pressing", the pre-forged billet 15 can be processed into a final forging 16. The final forging 16 is an ultra-large titanium alloy rotating body forging.

[0049] like Figure 1 and2 As shown, in order to ensure the accuracy of the positioning when the pre-forging upper die 1 cooperates with the bottom die 3, two guide sliding rods 11 are arranged on the pre-forging upper die 1, and the two guide sliding rods 11 are diagonally arranged. Meanwhile, two guide sliding holes 12 are arranged on the bottom die 3. When the pre-forging upper die 1 cooperates with the bottom die 3, the guide sliding rods 11 are embedded into the corresponding guide sliding holes 12.

[0050] After the pre-forging blank 15 and the finish-forging piece 16 are forged, in order to facilitate the taking out of the pre-forging blank 15 and the finish-forging piece 16 from the forging lower cavity 301, in the embodiment, a top rod hole is arranged at the bottom of the forging lower cavity 301, and a top rod 13 is arranged in the top rod hole. The number of the top rod holes can be multiple, and needs to be uniformly distributed.

[0051] As a way to realize the rotary connection between the die frame 201 and the finish-forging upper die 202, in the embodiment, as shown in the figure, Figures 3 to 5 the outer wall of the die frame 201 is provided with an annular track groove 4, and the outer wall of the finish-forging upper die 202 is provided with multiple connection grooves 5 arranged in a ring shape. The outer side of the annular track groove 4 is provided with multiple groove-type connecting pieces 6, each groove-type connecting piece 6 corresponds to each connection groove 5 one by one, one end of the groove-type connecting piece 6 extends into the connection groove 5, and the other end extends into the annular track groove 4. In the embodiment, a driving rod 7 is arranged on the outer side of the groove-type connecting piece 6. The finish-forging upper die 202 can be driven to rotate through the driving rod 7.

[0052] In order to reduce the contact friction between the groove-type connecting piece 6 and the annular track groove 4, a ball 8 is arranged between the groove-type connecting piece 6 and the annular track groove 4. Specifically, as shown in the figure, Figure 6 the lower horizontal part of the annular track groove 4 and the upper end bottom surface of the groove-type connecting piece 6 are both provided with a semicircular groove, the ball 8 rolls in the semicircular groove, and the two ends of the upper end of the groove-type connecting piece 6 are fixed with a baffle, and the baffle on both sides limits the ball 8 in the upper end of the groove-type connecting piece 6.

[0053] When the finish-forging upper die 202 is forged according to the cycle forging method of "pressing-uplifting-rotating-pressing", in order to ensure the accuracy of the forging position after each rotation, as shown in the figure, Figure 7 and 8 a plurality of rotation mark positions 9 are arranged in a ring shape on the outer wall of the die frame 201, and a positioning mark position 10 is arranged on the outer wall of the finish-forging upper die 202. When used, the positioning mark position 10 corresponds to the rotation mark position 9, and the finish-forging upper die 202 and the bottom die 3 can cooperate to complete a forging after rotation. In the embodiment, the positioning mark position 10 and the rotation mark position 9 are designed in the form of a key groove.

[0054] Meanwhile, when the final forging upper die 202 is forged according to the cycle forging method of "pressing-lifting-rotating-pressing", in order to ensure the stability of the final forging upper die 202 and the bottom die 3, a plurality of guide bosses 204 are uniformly distributed around the final forging upper cavity 203, and each guide boss 204 is arranged on the bottom surface of the final forging upper die 202. A plurality of guide grooves 302 are uniformly distributed around the forging lower cavity 301, and each guide groove 302 is arranged on the top surface of the bottom die 3. The number of guide grooves 302 is the same as the number of guide bosses 204, and the guide grooves 302 and the guide bosses 204 are embedded and matched.

[0055] The number of rotation mark positions 9, the number of guide bosses 204 and the number of guide grooves 302 need to be set according to the structural features of the final forging piece 16. As shown in Figure 9 and 10 In this embodiment, the top surface of the final forging piece 16 is provided with seven annularly and uniformly arranged forging piece grooves 1601, and each forging piece groove 1601 is provided with one corresponding forging piece protrusion 1602 on the outside. The bottom surface of the final forging piece 16 is provided with seven annularly and uniformly arranged forging piece protrusions 1602. Therefore, the number of rotation mark positions 9 in this embodiment is seven, and the number of guide bosses 204 and guide grooves 302 is also seven.

[0056] The structure of the pre-forging upper cavity 101, the structure of the final forging upper cavity 203 and the structure of the forging lower cavity 301 also need to be set according to the structural features of the final forging piece 16. According to the structural features of the top surface and the bottom surface of the final forging piece 16, in this embodiment, as shown in Figures 11 to 13 In the pre-forging upper cavity 101, seven pre-forging grooves 102 are arranged in a ring, and in the forging lower cavity 301, seven bottom die cavity grooves 303 are arranged in a ring. In this embodiment, two spaced final forging protrusions 205 and seven annular final forging grooves 206 are arranged in the final forging upper cavity 203. The final forging groove 206 plays a positioning role on the forging piece protrusion 1602 on the pre-forging blank 15. During final forging, only the two final forging protrusions 205 of the final forging upper cavity 203 press the pre-forging blank 15, and the rest only the material inside flows.

[0057] As shown in Figure 9 , 10As shown in Figures 14 and 15, the specific method of the forging mold in this embodiment of the invention is as follows: When the pre-forging upper cavity 101 and the forging lower cavity 301 are used together, the disc-shaped billet 14 can be processed into a pre-forging billet 15 in one go. The top and bottom surfaces of the processed pre-forging billet 15 are both formed with seven annularly arranged forging protrusions 1602. When the forging lower cavity 301 and the final forging upper cavity 203 are used together, by controlling the final forging upper mold 202 to follow the cyclic forging method of "pressing-lifting-rotating-pressing", the two final forging protrusions 205 in the final forging upper cavity 203 are forged and pressed in sequence on the top surface of the pre-forging billet 15 to form forging grooves 1601. After rotating 3 times and pressing 4 times, the final forging 16 with dimensions conforming to the drawing requirements is obtained.

[0058] Based on the structural features of the final forging 16 in this embodiment, this embodiment also discloses a method for forging an ultra-high load titanium alloy rotating body, which includes the following steps:

[0059] Step 1: Prepare a disc-shaped billet. Use a large flat die to perform multiple upsetting forgings on the bar stock to prepare a disc-shaped billet 14.

[0060] In practice, the end faces of the bar stock are milled flat to ensure that the perpendicularity of both end faces of the bar stock to the axis is ≤0.5, the roughness is ≤Ra6.3, and the edge chamfer is R30~R50. The ultra-large bar stock for preparing ultra-large titanium alloy rotating body forgings is placed in two upper and lower flat dies for multi-fire uniform deformation upsetting forging, resulting in a disc-shaped billet 14.

[0061] In this step, the bar stock cut to the required specifications is heated in an electric furnace at a temperature equal to the phase transformation temperature T of the titanium alloy. β Reduce the temperature by 30-50°C from the base temperature, i.e., T β - (30~50)℃. The heating time for cold material is calculated at 0.6~0.7 min / mm, and the heating time for hot material is calculated at 0.4~0.5 min / mm. For forgings in the same furnace, the timer starts from the moment the last piece exits the furnace. Reheating and holding are permitted 30 minutes after exiting the furnace. The holding time for cold material is calculated at 0.6~0.7 min / mm, and the holding time for hot material is calculated at 0.4~0.5 min / mm. Among these, pieces returned to the furnace ≤1 hour after exiting are considered hot material, and those returned >1 hour are considered cold material.

[0062] The heating time and the heat preservation time are calculated in the same way, based on the effective cross-sectional thickness (inscribed circle) of the material. For example, for a φ100×200mm bar, 100mm is used as the effective thickness; for a φ100×50mm bar, 50mm is used as the effective thickness.

[0063] T β This is the phase transformation temperature of titanium alloy materials. Around this temperature, the composition of the internal phases of the material will transform from the β phase to the α phase. This forming method is applicable to T... βForging of titanium alloy materials below a certain temperature (i.e., two-phase forging) is generally carried out at T. β Reduce the temperature by 30 to 50°C from the base temperature.

[0064] The key technical points in the forging process are: first, to reasonably allocate the deformation amount between each forging, so that the deformation amount of the bar stock is between 20% and 40% while ensuring that the height and diameter of the ultra-large size billet are less than the height of the electric furnace door; second, to lay heat-insulating asbestos on the upper end face of the billet and the lower plate die before each forging to ensure the forging temperature of the ultra-large size bar stock.

[0065] Step 2, pre-forging: The disc-shaped billet 14 is placed in the upper pre-forging die 1 and the lower pre-forging die 3, so that the disc-shaped billet 14 is pre-forged multiple times in the matching upper pre-forging cavity 101 and lower forging cavity 301 to prepare the pre-forged billet 15.

[0066] In practice, the disc-shaped billet 14 is preheated at a temperature of 100–200°C and held for 20–30 minutes. After removing the disc-shaped billet 14, its entire surface is sprayed with a titanium alloy-specific forging lubricant. After spraying, the disc-shaped billet 14 is placed in an electric furnace and heated to a temperature equal to the phase transformation point T of the titanium alloy material. β The temperature should be reduced by 30-50°C from the base temperature. The heating time for cold material should be calculated at 0.6-0.7 min / mm, and the heating time for hot material at 0.4-0.5 min / mm. For forgings in the same furnace, the timer starts from the moment the last piece exits the furnace, and reheating is permitted after 30 minutes. The holding time for cold material should be calculated at 0.6-0.7 min / mm, and the holding time for hot material at 0.4-0.5 min / mm. For pieces reheated within 1 hour of exiting the furnace, they are considered hot material; those reheated after >1 hour are considered cold material.

[0067] Meanwhile, the upper forging die 1 and the lower die 3 need to be placed in a heating furnace and heated to 250-350°C in advance, and kept at that temperature for 12 hours before being installed on the corresponding forging equipment.

[0068] Step 3, final forging: The pre-forged billet 15 is placed in the final forging upper die 202 and the bottom die 3, so that the pre-forged billet 15 is in the matching final forging upper cavity 203 and forging lower cavity 301. By controlling the final forging upper die group 2 to perform a cyclic forging process of pressing-lifting-rotating-pressing, the final forging part 16 is prepared.

[0069] In practice, the pre-forged billet 15 is preheated at a temperature controlled between 100℃ and 200℃ and held for 20 to 30 minutes. After removing the pre-forged billet 15, its entire surface is sprayed with a titanium alloy-specific forging lubricant. Then, the pre-forged billet 15 is placed in an electric furnace and heated to a temperature equal to the phase transformation point T of the titanium alloy material. β Reduce the temperature by 30-50°C from the base temperature, i.e., T β(30-50) °C. The heating time is calculated as 0.6-0.7 min / mm, and the pre-forged blank 15 is heated to the final holding time and then taken out of the furnace for use of the aluminum silicate fiber felt soft packing cover. After the packing cover, it is put into the furnace for holding, and the holding temperature is controlled at T β (30-50) °C, and after being heated to the temperature, it is held for 30-45 min and then forged; at the same time, the final forging upper die 202 and the bottom die 3 need to be heated to 250-350 °C in advance and held for 12 h, and then installed on the corresponding die forging equipment.

[0070] The technical points in the forging process are: first, to ensure that the positioning mark 10 corresponds to the rotating mark 9, so as to fix the rotation angle; second, to keep the die frame 201, the final forging upper die 202, the ball 8 and the groove connecting piece 6 fully lubricated, so as to shorten the rotation period and reduce the blank temperature drop rate, thereby increasing the forgeable time of the blank.

[0071] Step four, the final forging piece 16 is ejected from the bottom die by the ejecting rod 13 in the lower die cavity 301.

[0072] Example two

[0073] In this example, a super large size TB6 titanium alloy rotary body forging (outer size: φ1600x450mm, forging weight: 1813kg) is prepared. A φ550mm TB6 titanium alloy bar is used, the end face of the bar is first milled to ensure that the perpendicularity of the two end faces to the axis is ≤0.5, the roughness is ≤Ra6.3, and the edge chamfer is R30-R50, so that the bar does not bend during the upsetting process. Then, the bar is upset forged for 5 times using a flat die installed on the die forging equipment, and finally a cake blank with a size of φ1190x390mm is obtained. The heating temperature of each time is 760 °C, i.e. the phase transition point temperature T β of the TB6 titanium alloy material selected in this example is 800 °C, and 760 °C=T β -40 °C. The deformation amount and the heating time are shown in Table 1.

[0074] Table 1 is the deformation amount and the heating time of the bar

[0075]

[0076] The cake blank obtained above is pre-forged for 3 times using a pre-forging upper die 1 and a bottom die 3 installed on the die forging equipment to obtain a pre-forged blank 15. The heating temperature of each time is 760 °C, the holding time of the cold material is calculated as 0.6 min / mm, and the holding time of the hot material is calculated as 0.4 min / mm.

[0077] Then the cake of the previous step is placed in the final forging upper die 202 and bottom die 3 for final forging forming. During the forging process, the "pressing-lifting-rotating-pressing" cycle method is used for forging, and 7 rotating mark positions 9 are set, each rotating 51.4° (in principle, the forgings are allowed to have a size error within the range specified in the drawing, so the rotation angle can be 51.4° each time), the pre-forging blank contact area is 30% of the total projected area of the forging, after rotating 3 times and pressing 4 times, the forgings with sizes meeting the drawing requirements are obtained, and then the forgings are ejected from the bottom die 3 through the lower ejection mechanism. The heating temperature of the billet in this heating is 760℃, and the holding time is 280min. Further, under the premise of ensuring the ultrasonic testing blind area and the overall machining allowance of the part, the forgings are subjected to maximum cross-section reduction processing before heat treatment to improve the hardenability of the oversized TB6 titanium alloy rotary body forgings. Finally, the forgings are treated according to the following heat treatment system: heated to 765℃ and held for 120min, then taken out of the furnace and water cooled; heated to 515℃ and held for 495min, then taken out of the furnace and air cooled. Table 2 shows the room temperature tensile and fracture toughness properties of the final forgings.

[0078] Table 2 is the room temperature tensile and fracture toughness properties of the final forgings

[0079]

[0080] Figure 16 、 Figure 17 The low-magnification and microstructure of the final forgings are shown in Figures 1 and 2, respectively. As can be seen from the figures, the low-magnification structure of the forgings has no metallurgical defects and good flow lines; the microstructure is composed of β matrix and spherical or strip-shaped primary α phase, which meets the standard requirements of the forgings. Figure 17 The white structure is α phase, and the rest is β matrix.

[0081] The above-described embodiments are only to describe the preferred modes of the present application, and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those skilled in the art shall fall within the protection scope determined by the claims of the present application.

Claims

1. An ultra-high load titanium alloy rotary body forging die characterized by, It comprises: a pre-forging upper die (1), the bottom surface of which is provided with a pre-forging upper cavity (101); a final-forging upper die set (2), which comprises a die frame (201), the bottom of which is provided with a rotatable final-forging upper die (202), the bottom surface of which is provided with a final-forging upper cavity (203); a bottom die (3), the top surface of which is provided with a forging lower cavity (301); In use, first, the forging lower cavity (301) can be used in combination with the pre-forging upper cavity (101) or the final-forging upper cavity (203); when the pre-forging upper cavity (101) and the forging lower cavity (301) are used in combination, a pie-shaped blank (14) can be processed into a pre-forging blank (15); when the forging lower cavity (301) and the final-forging upper cavity (203) are used in combination, the pre-forging blank (15) can be processed into a final-forging piece (16) by controlling the final-forging upper die (202) to follow a cycle forging method of pressing-lifting-rotating-pressing. An annular track groove (4) is arranged on the outer wall of the die frame (201), and a plurality of connecting grooves (5) are uniformly arranged in a ring shape on the outer wall of the final-forging upper die (202); A plurality of groove-shaped connecting pieces (6) are arranged on the outside of the annular track groove (4), each groove-shaped connecting piece (6) corresponds to each connecting groove (5), one end of the groove-shaped connecting piece (6) extends into the connecting groove (5), and the other end extends into the annular track groove (4); A driving rod (7) is arranged on the outside of the groove-shaped connecting piece (6); A ball bearing (8) is arranged between the groove-shaped connecting piece (6) and the annular track groove (4).

2. The ultra-high load titanium alloy rotor forging mold of claim 1, wherein: A plurality of rotating mark positions (9) are uniformly arranged in a ring shape on the outer wall of the die frame (201), and a positioning mark position (10) is arranged on the outer wall of the final-forging upper die (202).

3. The ultra-high load titanium alloy rotor forging mold of claim 1, wherein: A plurality of guide bosses (204) are uniformly arranged around the final-forging upper cavity (203), and each guide boss (204) is arranged on the bottom surface of the final-forging upper die (202); a plurality of guide grooves (302) are uniformly arranged around the forging lower cavity (301), and each guide groove (302) is arranged on the top surface of the bottom die (3), the number of the guide grooves (302) is the same as that of the guide bosses (204), and the guide grooves (302) and the guide bosses (204) are embeddedly matched.

4. The ultra-high load titanium alloy rotor forging mold of claim 1, wherein: Two guide sliding rods (11) are arranged on the pre-forging upper die (1), and two guide sliding holes (12) are arranged on the bottom die (3), when the pre-forging upper die (1) is used in combination with the bottom die (3), the guide sliding rod (11) is embedded into the corresponding guide sliding hole (12).

5. The ultra-high load titanium alloy rotor forging mold of claim 1, wherein: A material ejecting rod hole is arranged at the bottom of the forging lower cavity (301), and a material ejecting rod (13) is arranged in the material ejecting rod hole.

6. A method for forging a super-high-load titanium alloy rotary body, comprising the super-high-load titanium alloy rotary body forging die according to any one of claims 1 to 5, characterized in that, The method comprises the following steps: Step one, preparing a pie-shaped blank, using a large flat die to perform multi-fire upsetting pie forging on a bar material to prepare a pie-shaped blank (14); Step two, pre-forging, the pie-shaped blank (14) is placed in the pre-forging upper die (1) and the bottom die (3), so that the pie-shaped blank (14) is pre-forged in the matched pre-forging upper cavity (101) and the forging lower cavity (301) for multiple times to prepare a pre-forged blank (15); Step three, final forging, the pre-forged blank (15) is placed in the final forging upper die (202) and the bottom die (3), so that the pre-forged blank (15) is forged in the matched final forging upper cavity (203) and the forging lower cavity (301), and the final forging upper die is controlled to follow the cycle forging mode of pressing-lifting-rotating-pressing to prepare a final forging piece (16).

7. The ultra-high load titanium alloy rotor forging forming method according to claim 6, characterized by: In the step one, the end face of the flat bar is milled to ensure that the roughness of the end face of the bar is ≤Ra6.3 and the edge chamfer is R30~R50; the bar material cut according to the process requirement is heated in the electric furnace, the heating temperature is T β - selected in the range of (30~50)℃; In the second step, the cake blank (14) is preheated to a temperature of 100-200°C and kept for 20-30 minutes; after the cake blank (14) is taken out, the whole surface is sprayed with a special forging lubricant for titanium alloy; after the spraying is completed, the cake blank (14) is placed in an electric furnace for heating, and the heating temperature is T β - (30-50) °C; at the same time, the pre-forging upper die (1) and the bottom die (3) need to be heated in a heating furnace in advance; In the third step, the pre-forging blank (15) is preheated, the preheating temperature is controlled at 100-200°C, and the holding time is 20-30 minutes; after the pre-forging blank (15) is taken out, the whole surface is sprayed with a special forging lubricant for titanium alloy; then the pre-forging blank (15) is placed in an electric furnace for heating, the heating temperature is T β - (30-50) °C, the heating time is calculated according to 0.6-0.7 min / mm, and after the pre-forging blank (15) is heated to the final holding time, an aluminum silicate fiber felt soft cover is used to take out the pre-forging blank (15) from the furnace, the pre-forging blank (15) is covered and then put into the furnace, and after being heated to the temperature, the pre-forging blank (15) is held for 30-45 minutes and then taken out for forging; at the same time, the final forging upper die (202) and the bottom die (3) need to be placed in a heating furnace for heating in advance.

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