TC4 Titanium Alloy T-shaped Section Multi-directional Forging Die and Method

Abstract

The present invention provides a multi-directional forging forming die and method for TC4 titanium alloy T-shaped profiles, relating to the technical field of forging. When the upper die is pressed in place for the first time, neither the horizontal plate nor the vertical plate is fully filled. When the side die is formed in place in the opposite direction, the vertical plate is basically filled. When the upper die is pressed in place for the second time, the filling of the side of the horizontal plate is completed. By adopting this forming method, it is possible to accurately distribute the required metal volume of the horizontal plate and the vertical plate during the multi-directional forging process, and at the same time meet the pre-distribution of the forming load of the forging equipment and the forming quality of the titanium alloy T-shaped profile forging. By adopting the multi-directional forging forming method and forming die with one heat and one process, thin-walled titanium alloy T-shaped profile forgings with large cross-sectional size changes can be produced. The size and shape of the forgings are close to those of the parts, with high raw material utilization rate, less machining man-hours, and high production efficiency. This method can accurately distribute the required metal volume for the forming of the horizontal plate and the vertical plate, making the metal deformation uniform, the flow reasonable, and the structure dense, without subsequent straightening.

Description

Technical Field

[0001] The present invention relates to the technical field of forging, and particularly relates to a multi-directional forging forming die and method for a TC4 titanium alloy T-profile. Background Art

[0002] Titanium and its alloys have characteristics such as low density, good corrosion resistance, and high specific strength. Therefore, they have become an excellent structural material and are widely used in the fields of aviation, aerospace, marine, and chemical machinery, and occupy an important position in the field of national defense science and technology.

[0003] Currently, the extrusion method is mainly used to manufacture titanium alloy T-profiles. However, the extrusion of T-profiles faces problems such as low production efficiency, more raw material losses, low yield, uneven performance, complex stress conditions of the die, low life, and easy cross-section distortion and twisting of thin-walled parts. In addition, the extrusion of T-profiles has disadvantages such as increasing subsequent straightening processes and high manufacturing costs. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a multi-directional forging forming die and method for a TC4 titanium alloy T-profile to solve the above problems.

[0005] Based on the above purpose, the present invention provides a multi-directional forging forming die for a TC4 titanium alloy T-profile, including: a lower die, a lower die backing plate, a side die connection assembly, side dies, an upper die, an upper die connection assembly, and an end face die; the lower die is connected to the lower die backing plate, side die connection assemblies are respectively slidably connected to the lower die backing plates on both sides of the lower die, and the two side die connection assemblies are oppositely arranged; one end of each of the two side die connection assemblies is connected to a side die, and an extrusion cavity is formed at one end of the two side dies facing each other; the upper die is connected to the upper die connection assembly, and the end of the upper die is slidably connected in the extrusion cavity; end face dies are respectively connected to the lower die backing plates at both ends of the extrusion cavity.

[0006] Further, the side die connection assembly includes a side die seat, a U-shaped pressure groove, a horizontal push rod, and a horizontal connecting rod. One end of the side die seat is connected to the side die, the other end of the side die seat is connected to one end of the horizontal push rod through the U-shaped pressure groove, and the other end of the horizontal push rod is threadedly connected to the horizontal connecting rod.

[0007] Further, the upper die connection assembly includes an upper die connecting plate and an upper die bearing backing plate. The upper die connecting plate is connected to the upper die bearing backing plate. A T-shaped groove is formed in the upper die connecting plate. The upper die is of a T-shaped structure and is inserted into the T-shaped groove, and the end of the upper die extends out of the upper die connecting plate.

[0008] Further, it further includes a moving beam backing plate and a workbench backing plate. The moving beam backing plate is connected to the upper surface of the upper die bearing backing plate, and the workbench backing plate is connected to the lower surface of the lower die backing plate.

[0009] Furthermore, an end face wedge block is provided at one end of the end face die away from the extrusion cavity, and the end face wedge block is connected to the lower die backing plate; a guide post is connected to the end face die, and the guide post slidably penetrates through the upper die connecting plate.

[0010] The multi-directional forging forming method of TC4 titanium alloy T-shaped profiles is carried out according to the following steps: S1. Perform surface treatment on the billet; S2. Heat the billet after the surface treatment to 35°C ± 5°C below the β phase transition point of the billet, and perform heat preservation treatment on the billet; S3. Heat the die to 350°C - 450°C; S4. Connect the heated die to the forging equipment; S5. Adjust the initial position of the upper die and the initial position of the side die, and place the billet in the extrusion cavity; S6. Control the upper die to press down until the upper die moves to the first pressing position; S7. Control the two side dies to move in opposite directions until the two side dies respectively contact the side surfaces of the two end face dies and hold the pressure; S8. Control the upper die to press down until the lower surface of the upper die contacts the upper surface of the side die seat and hold the pressure for 3 s; S9. Open the die to take out the part, and complete the forging of the T-shaped profile.

[0011] Furthermore, S1 is specifically: put the billet into an electric heating furnace and heat it to 100°C - 200°C; take out the billet until the surface temperature of the billet drops to 70°C - 80°C, then spray a protective lubricant on the surface of the billet and dry it naturally, wherein the spraying thickness of the protective lubricant is 0.2 mm - 0.3 mm.

[0012] Furthermore, in S5, adjusting the initial position of the upper die and the initial position of the side die specifically means: adjusting the position of the upper die so that the distance between the lower surface of the upper die and the upper surface of the side die is greater than or equal to 200 mm; adjusting the position of the side die so that the distance between the opposite end faces of the two side dies is greater than the thickness of the vertical plate of the T-shaped profile and less than the diameter of the billet.

[0013] Furthermore, in S9, opening the die to take out the part specifically means: relieve the pressure of the die; control the upper die to move upward by 250 mm - 300 mm; control the two side dies to move away from each other by 350 mm - 450 mm; transfer the T-shaped profile forging.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: when the first pressing of the upper die is in place, neither the transverse plate nor the vertical plate is completely filled; when the side die is formed in place, the vertical plate is basically filled; when the second pressing of the upper die is in place, the filling of the side of the transverse plate is completed. By adopting this forming method, the accurate distribution of the required metal volume of the transverse plate and the vertical plate can be realized during the multi-directional forging process, and the pre-distribution of the forming load of the forging equipment can be satisfied, as well as the forming quality of the titanium alloy T-profile forgings. By adopting the multi-directional forging forming method and the forming die with one fire and one process, thin-walled titanium alloy T-profile forgings with large cross-sectional size changes can be produced. The size and shape of the forgings are close to those of the parts, with high raw material utilization rate, less machining man-hours, and high production efficiency. This method can realize the accurate distribution of the required metal volume for the forming of the transverse plate and the vertical plate, making the metal deformation uniform, the flow reasonable, the structure dense, and the performance excellent, without subsequent straightening. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of a titanium alloy T-profile;

[0016] Figure 2 is the front view of the multi-directional forging forming die of the TC4 titanium alloy T-profile provided by the embodiment of the present invention;

[0017] Figure 3 is Figure 2 the schematic diagram of the A-A cross-section in

[0018] Figure 4 is the top view of the multi-directional forging forming die of the TC4 titanium alloy T-profile provided by the embodiment of the present invention;

[0019] Figure 5 is the schematic diagram of the blank position of the multi-directional forging forming method of the TC4 titanium alloy T-profile provided by the embodiment of the present invention;

[0020] Figure 6 is the schematic diagram of S6 of the multi-directional forging forming method of the TC4 titanium alloy T-profile provided by the embodiment of the present invention;

[0021] Figure 7 is the schematic diagram of S7 of the multi-directional forging forming method of the TC4 titanium alloy T-profile provided by the embodiment of the present invention;

[0022] Figure 8 is the schematic diagram of the cross-section change of the blank during the forging process of the multi-directional forging forming method of the TC4 titanium alloy T-profile provided by the embodiment of the present invention.

[0023] The labels in the figure are: 1, lower die; 2, lower die backing plate; 3, side die; 4, upper die; 5, end face die; 6, moving beam backing plate; 7, workbench backing plate; 8, bar blank; 9, side die base; 10, U-shaped pressing groove; 11, horizontal push-pull rod; 12, horizontal connecting rod; 13, upper die connecting plate; 14, upper die bearing backing plate; 15, end face wedge block; 16, guide pillar; 17, cross plate; 18, vertical plate. Specific embodiments

[0024] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to specific embodiments.

[0025] As Figures 1 to 8 shown, a multi-directional forging forming die for TC4 titanium alloy T-section proposed by the present invention is composed of a lower die 1, a lower die backing plate 2, a side die connection assembly, a side die 3, an upper die 4, an upper die connection assembly, an end face die 5, a moving beam backing plate 6 and a workbench backing plate 7, etc. The T-section is composed of a cross plate 17 and a vertical plate, with a symmetrical structure, large cross-sectional dimension changes, large metal deformation, and difficult forming.

[0026] The workbench backing plate 7 is connected to the lower surface of the lower die backing plate 2, and the workbench backing plate 7 is used to connect to the workbench. The lower die 1 is connected to the lower die backing plate 2, the lower die 1 is embedded in the lower die backing plate 2, and the upper surface of the lower die 1 is flush with the upper surface of the lower die backing plate 2. During the forging process, both the lower die 1 and the lower die backing plate 2 are fixed without displacement.

[0027] Side die connection assemblies are respectively slidably connected to the lower die backing plates 2 on both sides of the lower die 1, and the two side die connection assemblies are arranged oppositely. The side die connection assembly is composed of a side die base 9, a U-shaped pressing groove 10, a horizontal push-pull rod 11 and a horizontal connecting rod 12. The side die base 9 and the lower die backing plate 2 are guided through a dovetail structure. One end of the side die base 9 is connected to the side die 3 through a T-shaped bolt, and an extrusion cavity is provided at one end where the two side dies 3 face each other. The other end of the side die base 9 is connected to one end of the horizontal push-pull rod 11 through the U-shaped pressing groove 10, and the other end of the horizontal push-pull rod 11 is threadedly connected to the horizontal connecting rod 12. The end of the horizontal connecting rod 12 is connected to the horizontal die closing cylinder of the forging equipment, which provides the horizontal forming load. During the forging process, the two side dies 3 move in opposite directions to realize the pressing of the bar blank 8; the two side dies 3 move in opposite directions to realize die opening in the horizontal direction.

[0028] The upper die 4 is connected to the upper die connecting component which consists of the upper die connecting plate 13 and the upper die bearing backing plate 14. The upper die connecting plate 13 is connected to the upper die bearing backing plate 14 by T-bolts. The moving beam backing plate 6 is connected to the upper surface of the upper die bearing backing plate 14 and is used to connect with the moving crossbeam of the forging equipment. The vertical forming load is provided by the vertical die-closing cylinder of the forging equipment. A T-slot is formed in the upper die connecting plate 13. The upper die 4 has a T-shaped structure and is inserted into the T-slot. The end of the upper die 4 extends out of the upper die connecting plate 13 and is slidably connected in the extrusion cavity.

[0029] End face dies 5 are respectively connected to the lower die backing plates 2 at both ends of the extrusion cavity. An end face wedge block 15 is arranged at one end of the end face die 5 away from the extrusion cavity. Both the end face wedge block 15 and the end face die 5 are positioned through the sunk grooves of the lower die backing plate 2. During the forging process, the end face die 5 and the end face wedge block 15 are fixed without displacement. A guide pillar 16 is connected to the end face die 5. The guide pillar 16 is slidably inserted into the upper die connecting plate 13 and is used to provide guiding for the up and down movement of the upper die connecting plate 13.

[0030] The multi-directional forging forming method of TC4 titanium alloy T-section bars is carried out according to the following steps:

[0031] Before forging, a billet 8 is selected according to specific requirements. In this embodiment, the billet 8 is a round bar with a diameter of φ42mm. Through calculation, the length of the billet 8 is equivalent to the length of the T-section bar forging, ensuring the forming quality of the forging, especially at both end faces.

[0032] Then, the die is installed. When installing, the lower die 1 and the lower die backing plate 2 should be installed first, then the end face die 5 and the end face wedge block 15, and finally the upper die 4, the upper die connecting component, and the side die 3 and the side die 3 connecting piece to meet the requirements of installation, positioning, and guiding accuracy.

[0033] S1. The surface of the billet 8 is treated as follows: The billet 8 is put into an electric heating furnace and heated to 100°C - 200°C; the billet 8 is taken out. After the surface temperature of the billet 8 drops to 70°C - 80°C, a special protective lubricant is sprayed on the surface of the billet 8 with a spray gun and dried naturally. Among them, the spraying thickness of the protective lubricant is 0.2mm - 0.3mm, and the thickness is required to be uniform, continuous, and complete.

[0034] S2. The surface-treated billet 8 is heated to 35°C ± 5°C below the β phase transformation point of the billet 8, and the billet 8 is subjected to heat preservation treatment to ensure uniform heating.

[0035] S3. The die is heated to 350°C - 450°C by a resistance furnace.

[0036] S4. Connect the mold after heating to the forging equipment. Before the formal forging, it should be run without load for 3 to 5 times to ensure that the technological actions are correct, the mold runs smoothly, without jamming, and the mold position is correct and meets the technological requirements.

[0037] S5. Adjust the initial positions of the upper die 4 and the side die 3. Specifically: Adjust the position of the upper die 4 so that the distance between the lower surface of the upper die 4 and the upper surface of the side die 3 is greater than or equal to 200 mm; Adjust the position of the side die 3 so that the distance between the opposite end faces of the two side dies 3 is greater than the thickness of the vertical plate of the T-shaped section and less than the diameter of the billet 8. In this embodiment, the distance between the opposite end faces of the two side dies 3 is set to 26 mm.

[0038] After adjusting the initial positions of the upper die 4 and the side die 3, place the billet 8 in the extrusion cavity, at the rounded corner of the side die 3. When transferring the billet 8, the billet 8 should reach the set starting forging temperature and holding time. The transfer time of the billet 8 is less than or equal to 40 s, and measures should be taken to prevent surface temperature drop.

[0039] S6. Control the upper die 4 to press down until the upper die 4 moves to the first pressing position. In this embodiment, the first pressing position is set at a distance of 7 mm from the upper surface of the side die base 9 to the lower surface of the upper die connecting plate 13. When the first pressing of the upper die 4 is completed, part of the metal flows downward and part of the metal flows to the left and right sides, completing the initial distribution of the metal.

[0040] S7. Control the two side dies 3 to move in opposite directions until the two side dies 3 are in contact with the sides of the two end face dies 5 respectively, and hold the pressure. In this embodiment, each of the two side dies 3 moves 8 mm. During the pressing process of the side die 3, the metal of the vertical plate flows downward to complete the filling of the vertical plate, and the metal of the cross plate 17 hardly deforms.

[0041] S8. Control the upper die 4 to press down until the lower surface of the upper die 4 is in contact with the upper surface of the side die base 9, and hold the pressure for 3 s. In this embodiment, the upper die 4 moves 7 mm. During the second pressing process of the upper die 4, the metal of the cross plate 17 flows laterally to complete the filling of the cross plate 17. The upper die 4 is pressed in place, and the multi-directional forging process of the titanium alloy T-shaped section is completed.

[0042] S9. Open the mold to take the part. Specifically: Release the pressure on the mold; Control the upper die 4 to move upward by 250 mm to 300 mm; Control the two side dies 3 to move in opposite directions by 350 mm to 450 mm respectively; Transfer the T-shaped section forging through a special tool. Complete the forging of the T-shaped section and proceed with the forging of the next forging.

[0043] Embodiments of the present invention are intended to cover all such alternatives, modifications, and variations that fall within the broad scope of the appended claims. Accordingly, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A multi-directional forging forming method for TC4 titanium alloy T-shaped profiles, characterized in that, The multi-directional forging die for TC4 titanium alloy T-section includes: a lower die, a lower die backing plate, a side die connection assembly, side dies, an upper die, an upper die connection assembly, and an end face die; the lower die is connected to the lower die backing plate, and side die connection assemblies are respectively slidably connected to the lower die backing plates on both sides of the lower die, and the two side die connection assemblies are arranged oppositely; one end of each of the two side die connection assemblies is respectively connected to a side die, and an extrusion cavity is formed at one end of the two side dies facing each other; the upper die is connected to the upper die connection assembly, and the end of the upper die is slidably connected in the extrusion cavity; end face dies are respectively connected to the lower die backing plates at both ends of the extrusion cavity; the side die connection assembly includes a side die seat, a U-shaped pressing groove, a horizontal push rod, and a horizontal connecting rod, one end of the side die seat is connected to the side die, the other end of the side die seat is connected to one end of the horizontal push rod through the U-shaped pressing groove, and the other end of the horizontal push rod is threadedly connected to the horizontal connecting rod; The multi-directional forging method for the TC4 titanium alloy T-section is carried out according to the following steps: S1. Perform surface treatment on the billet; S2. Heat the billet after surface treatment to 35°C ± 5°C below the β phase transformation point of the billet, and perform heat preservation treatment on the billet; S3. Heat the die to 350°C - 450°C; S4. Connect the heated die to the forging equipment; S5. Adjust the initial position of the upper die and the initial position of the side die, and place the billet in the extrusion cavity; S6. Control the upper die to press down until the upper die moves to the first pressing position; S7. Control the two side dies to move in opposite directions until the two side dies respectively contact the side surfaces of the two end face dies and hold the pressure; S8. Control the upper die to press down until the lower surface of the upper die contacts the upper surface of the side die seat and hold the pressure for 3 s; S9. Open the die and take out the part to complete the forging of the T-section.

2. The multi-directional forging forming method of TC4 titanium alloy T-shaped section bar according to claim 1, characterized in that, The upper die connection assembly includes an upper die connecting plate and an upper die bearing backing plate, the upper die connecting plate is connected to the upper die bearing backing plate, a T-shaped groove is formed in the upper die connecting plate, the upper die is of a T-shaped structure, the upper die is inserted into the T-shaped groove, and the end of the upper die extends out of the upper die connecting plate.

3. The multi-directional forging forming method of TC4 titanium alloy T-shaped section bars according to claim 2, wherein, It also includes a moving beam backing plate and a workbench backing plate, the moving beam backing plate is connected to the upper surface of the upper die bearing backing plate, and the workbench backing plate is connected to the lower surface of the lower die backing plate.

4. The multi-directional forging forming method of TC4 titanium alloy T-shaped section bars according to claim 2, wherein An end face wedge block is arranged at one end of the end face die away from the extrusion cavity, and the end face wedge block is connected to the lower die backing plate; a guide post is connected to the end face die, and the guide post is slidably inserted into the upper die connecting plate.

5. The multi-directional forging forming method of TC4 titanium alloy T-shaped section bar according to claim 1, characterized in that, S1 is specifically: Put the billet into an electric heating furnace and heat it to 100°C - 200°C; Take out the billet, and until the surface temperature of the billet drops to 70°C - 80°C, spray a protective lubricant on the surface of the billet and dry it naturally, wherein the spraying thickness of the protective lubricant is 0.2 mm - 0.3 mm.

6. The multi-directional forging forming method of TC4 titanium alloy T-shaped section bar according to claim 1, wherein, In S5, the adjustment of the initial position of the upper die and the initial position of the side die is specifically: Adjust the position of the upper die so that the distance between the lower surface of the upper die and the upper surface of the side die is greater than or equal to 200 mm; Adjust the position of the side die so that the distance between the opposite end faces of the two side dies is greater than the thickness of the vertical plate of the T-section and less than the diameter of the billet.

7. The multi-directional forging forming method of TC4 titanium alloy T-shaped section bar according to claim 1, characterized in that, In S9, the opening of the die and taking out the part is specifically: Release the pressure of the die; Control the upper die to move upward by 250 mm - 300 mm; Control the two side molds to move in opposite directions by 350 mm to 450 mm respectively; Transfer the T-profile forging.

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