Tc32 titanium alloy cake blank forge piece forming device and method

Abstract

The invention discloses a Tc32 titanium alloy cake blank forge piece forming device. The Tc32 titanium alloy cake blank forge piece forming device comprises an upper die body and a lower die body which are matched with each other; working cavity parts of which the sections are one third of a circle are arranged at the corresponding positions of the working surfaces of the upper die body and the lower die body; parameters of the two working cavity parts are consistent. The invention further discloses a forming method of the Tc32 titanium alloy cake blank forge piece. The forming method comprises the following steps that adaptive forging equipment is selected; two sets of matched flat hammer anvil molds are arranged; one set of flat hammer anvil mold is manufactured into a required swage block; the bar is subjected to multi-heating-number heating flat hammer anvil forging and then subjected to one-heating-number heating swage anvil forging; sand blasting and polishing are carried out; and performing heat treatment. According to the Tc32 titanium alloy cake blank forge piece forming device, forming production of the forge piece is completed, it is ensured that the final internal structure of the forge piece meets the requirement while the forge piece forming time is shortened, the coaxiality and ovality of the forge piece can be effectively improved, and therefore it is ensured that the boundary dimension of the forge piece meets the requirement of a drawing.

Description

Technical Field

[0001] The invention relates to the technical field of forging hot processing, and in particular to a Tc32 titanium alloy cake blank forging forming device and method. Background Art

[0002] In the field of aerospace, the performance requirements for materials are very high. They must have high strength, light weight, and be stable under extreme environmental conditions. The characteristics of Tc32 titanium alloy make it possible to be used in the manufacture of certain parts of aircraft or aircraft, such as engine parts, structural parts, etc. The corrosion resistance of Tc32 titanium alloy enables it to work stably for a long time in such harsh environments.

[0003] The forging method of conventional large-sized free forgings is usually to select suitable bars and use the method of upsetting, then rounding and flattening the end surface to complete the large-sized free forgings. The disadvantage of this method is that the forging time is long, and the coaxiality and ovality of the forgings after forging are difficult to guarantee. More importantly, due to the long forging time or the large number of production fires, the final physical and chemical tests of the forgings are unqualified, resulting in high scrap, waste of resources, and affecting the completion. That is, only the forging is formed according to the size of the forging, but there are few control requirements for the forging process. Conventional forming forging has little research on the internal organization and performance of the forging required by the design. How to ensure that the internal organization and performance of the forgings are qualified after forging and heat treatment is the key to this product. Summary of the invention

[0004] The object of the present invention is to provide a Tc32 titanium alloy cake blank forging forming device and method, which can improve the production efficiency of forgings while ensuring that the external dimensions, structure and performance of the forgings meet the requirements.

[0005] In order to solve the above technical problems, the present invention provides a Tc32 titanium alloy forging forming device, comprising a matching upper die body and a lower die body;

[0006] A working cavity portion with a cross-section of one-third of a circle is provided at corresponding positions of the working surfaces of the upper mold body and the lower mold body; and parameters of the two working cavity portions are consistent.

[0007] In the Tc32 titanium alloy cake forging forming device, further, the radius of the working chamber part is: R=1 / 2*forging diameter+1 / 2*forging positive tolerance.

[0008] In the Tc32 titanium alloy cake forging forming device, further, the connection between the working cavity part on the upper die body and the upper die body and the connection between the working cavity part of the lower die body and the lower die body both adopt rounded corner transition.

[0009] In the Tc32 titanium alloy cake forging forming device, further, the radius of the fillet is in the range of 20 mm to 25 mm.

[0010] In the Tc32 titanium alloy cake forging forming device, further, the distance from the rotation center of the working chamber part to the deepest part of the working chamber part is: H = 1 / 3*forging diameter+forging hot forging allowance.

[0011] The present invention also provides a Tc32 titanium alloy forging forming method, comprising the following steps:

[0012] Select suitable forging equipment according to the size of forgings;

[0013] Two sets of suitable flat hammer anvil dies are equipped according to the selected forging equipment;

[0014] One set of flat hammer anvil molds is manufactured into a required anvil according to the size of the forging, and the anvil is the Tc32 titanium alloy billet forging forming device described above;

[0015] The bar material is subjected to multi-fire heating flat hammer anvil forging and then single-fire heating die anvil forging to obtain the required forgings;

[0016] performing sandblasting and grinding on the obtained forging;

[0017] Heat treatment is performed on the forgings after sandblasting and grinding.

[0018] In the Tc32 titanium alloy cake forging forming method, further, the heating temperature is 30° C. to 40° C. below the phase transformation point.

[0019] In the Tc32 titanium alloy cake forging forming method, further, after the obtained forging is sandblasted and polished, the size of the forging is inspected.

[0020] In the Tc32 titanium alloy cake forging forming method, further, after the forging is heat treated, the forging is subjected to physical and chemical testing.

[0021] In the Tc32 titanium alloy forging forming method, further, the specific steps of the heat treatment are: air cooling after keeping at 928°C for 45 minutes, and then keeping at 565°C for 360 minutes.

[0022] Compared with the prior art, the present invention has at least the following beneficial effects:

[0023] The Tc32 titanium alloy cake forging forming device provided by the present invention is used to complete the forming production of Tc32 titanium alloy cake forgings, which shortens the forging forming time and ensures that the final internal structure of the forging meets the requirements, and can effectively improve the coaxiality and ovality of the forging, thereby ensuring that the external dimensions of the forging meet the requirements of the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of the upper die body in the Tc32 titanium alloy forging forming device of the present invention;

[0025] Figure 2 It is a schematic diagram of the overall structure of the lower die body in the Tc32 titanium alloy forging forming device of the present invention;

[0026] Figure 3 It is a top view of the overall structure of the lower die body in the Tc32 titanium alloy forging forming device of the present invention;

[0027] Figure 4 It is a front cross-sectional view of the overall structure of the lower die body in the Tc32 titanium alloy forging forming device of the present invention;

[0028] Figure 5 It is a schematic diagram of the process of forming the Tc32 titanium alloy cake blank forging of the present invention. DETAILED DESCRIPTION

[0029] The Tc32 titanium alloy forging forming device and method of the present invention will be described in more detail below in conjunction with the schematic diagram, wherein the preferred embodiment of the present invention is shown, and it should be understood that those skilled in the art can modify the present invention described herein and still achieve the advantageous effects of the present invention. Therefore, the following description should be understood as being widely known to those skilled in the art and not as a limitation of the present invention.

[0030] The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and are not in exact proportions, and are only used to facilitate and clearly assist in illustrating the purpose of the embodiments of the present invention.

[0031] like Figure 1 and Figure 2 As shown, an embodiment of the present invention proposes a TC32 titanium alloy cake forging forming device, including a matching upper mold body 1 and a lower mold body 2; a working cavity part 3 with a cross-section of one-third of a circle is provided at corresponding positions of the working surfaces of the upper mold body 1 and the lower mold body 2; the parameters of the two working cavity parts 3 are consistent.

[0032] Specific, combined with reference Figure 3 and Figure 4The lower die body 2 can be the universal flat hammer anvil lower die of the selected production equipment, and its maximum outline size is set according to the universal corresponding equipment, that is, as shown in the figure, L1 is the length size of the universal flat hammer anvil lower die of the selected production equipment; N1 is the width size of the universal flat hammer anvil lower die of the selected production equipment; H1 is the height size of the universal flat hammer anvil lower die of the selected production equipment; and its clamping can be carried out according to the clamping of the hammer anvil of the universal equipment;

[0033] The upper mold body 1 can be the universal working flat hammer anvil upper mold of the selected production equipment, and its maximum wheel drop size is set according to the universal corresponding equipment. For details, please refer to the above description of the lower mold body 2, and no further details will be given here.

[0034] The working chamber part 3 is the main design core of the forging forming part;

[0035] The lower die body 2 utilizes the working cavity portion 3 thereon to machine a raised one-third circular cake in the center of the lower die body 2 that is similar to the shape of the forging, and the width h of the working cavity portion 3 is determined according to the thickness of the forging.

[0036] The upper die body 1 utilizes the working cavity portion 3 thereon to machine an upright one-third circular cake in the center of the upper die body 1 that is similar to the shape of the forging, and the width of the working cavity portion 3 thereof is the same as the width h of the working cavity 3 on the lower die body 2.

[0037] In the above embodiment, the radius of the working chamber part 3 is: R = 1 / 2*forging diameter + 1 / 2*forging positive tolerance, and the distance from the rotation center of the working chamber part to the deepest part of the working chamber part is: H = 1 / 3*forging diameter + forging hot forging allowance.

[0038] In the above embodiment, the connection between the working cavity part 3 on the upper mold body 1 and the upper mold body 1 and the connection between the working cavity part 3 of the lower mold body 2 and the lower mold body 2 are both transitioned by rounded corners r. The principle is to choose a larger rounded corner r as much as possible without affecting the forging, so that it is not easy to damage the forging body during the forging process.

[0039] Preferably, the radius of the fillet r ranges from 20 mm to 25 mm.

[0040] like Figure 4 As shown, the embodiment of the present invention also provides a Tc32 titanium alloy forging forming method, comprising the following steps:

[0041] S1. Select suitable forging equipment according to the size of forgings;

[0042] S2. Equip two sets of suitable flat hammer anvil dies according to the selected forging equipment;

[0043] S3, manufacturing one set of flat hammer anvil molds into a required anvil according to the size of the forging, wherein the anvil is the Tc32 titanium alloy cake forging forming device described above;

[0044] S4, performing flat hammer anvil forging with multiple heatings and then single heating anvil forging on the bar material to obtain the desired forging, wherein the heating temperature is 30° C. to 40° C. below the phase transformation point;

[0045] S5, sandblasting and grinding the obtained forging, and then performing dimensional inspection on the forging;

[0046] S6. Heat treat the forgings after sand blasting and grinding, and then perform physical and chemical tests on the forgings;

[0047] Specifically, the heat treatment steps are: heat preservation at 928° C. for 45 minutes and then air cooling, and then heat preservation at 565° C. for 360 minutes and then air cooling.

[0048] A specific embodiment is presented below to provide a more detailed description of the Tc32 titanium alloy forging forming device and method provided by the present invention.

[0049] In this specific embodiment, the goal is to forge a Tc32 titanium alloy bar with a size of Ф300mm×840mm into The specific steps for forging Tc32 titanium alloy billet are as follows:

[0050] Step 1: According to the size of the forging, the forging equipment to be produced is selected as a 2500T fast forging machine;

[0051] Step 2: According to the selected production equipment, select a set of equipment universal flat hammer anvil for processing anvil, and preset a set of flat hammer anvil produced on a 2500T fast forging machine;

[0052] The anvil includes an upper die body, a lower die body and a working cavity. The outer dimensions of the upper die body and the lower die body are selected according to the clamping requirements of the flat hammer anvil of the production equipment. That is, the non-working part should meet the corresponding standard requirements. The outer dimensions can be adjusted appropriately according to the needs of the forgings. The working cavity part only needs to be processed and formed on the working surfaces of the upper die body and the lower die body.

[0053] The external dimensions of the upper mold body and the lower mold body shall be implemented according to the data in Table 1, and the clamping can be carried out according to the general requirements of the flat hammer anvil clamping of the general equipment. Table 1 is the dimension parameter table of the upper mold body and the lower mold body;

[0054] Anvil size length width high Upper body 880 650 450 lower body 880 650 420

[0055] Table 1

[0056] Step 3: Process the anvil according to the selected flat hammer anvil;

[0057] After the main parameters of the upper and lower mold bodies are confirmed, the working cavity part is processed. The working cavity part of the lower mold body is processed in the center of the lower mold body to form a one-third circle close to the shape of the forging: the radius R of the circle is: R = 1 / 2 * forging diameter + 1 / 2 * forging positive tolerance, that is, R = 1 / 2 × 585 + 7 = 299.5mm; the distance from the rotation center of the working cavity part to the deepest part of the working cavity part is: H = 1 / 3 * forging diameter + forging hot forging allowance, and the hot forging allowance is implemented according to Table 2. Table 2 is a parameter table of hot forging allowance values ​​corresponding to forgings of various sizes. According to the size of the forging, the hot forging allowance is selected as 13mm, that is, H = 1 / 3 × 585 + 13 = 208mm. The connection between the working cavity part on the lower mold body and the lower mold body adopts a fillet r transition, and the value of r is 25mm. The processing of the working cavity part on the upper mold body is consistent with that of the upper mold body, so I will not elaborate on it here;

[0058] Forging diameter φ(mm) φ≤499 500≤φ≤999 1000≤φ≤1199 φ≥1200 Hot forging allowance(mm) 8～10 11～14 15～20 21～25

[0059] Table 2

[0060] Step 4: Use the selected equipment, flat hammer anvil and manufactured anvil to forge the bar material, specifically:

[0061] Step 1: 1st fire: Heating temperature: 40℃ below the phase change point (β=916) i.e. 976℃×180min;

[0062] Forging size: Forged to:

[0063] Forging method: flat hammer anvil forging;

[0064] Step 2: 2nd fire: Heating temperature: 40℃ below phase change point (β=916) i.e. 976℃×205min (hot material) / 175min (cold material)

[0065] Forging size: φ346×630 Forging to:

[0066] Forging method: flat hammer anvil forging;

[0067] Step 3: 3rd fire: Heating temperature: 40℃ below phase change point (β=916) i.e. 976℃×215min (hot material) / 255min (cold material)

[0068] Forging size: φ425×420 forging to

[0069] Forging method: anvil forging;

[0070] Step 5: After forging, sandblast and polish to check whether the size and shape meet the requirements of forgings;

[0071] Step 6: Keep the forgings at 928℃ for 45 minutes and then air cool them. Keep them at 565℃ for 360 minutes and then air cool them. After the physical and chemical tests are qualified, they will be put into storage for final inspection.

[0072] The results of physical and chemical tests are as follows:

[0073] High-power optical microscope observation: Primary α phase content: The organization is all lamellar, no large blocks of transformed α, no needle-shaped α Wei's organization, all meet the standard Figure 2 of 4 levels.

[0074] Low-power optical microscope observation: There are no shrinkage cavities, pores, delamination, segregation, cracks, metal or non-metal inclusions and other metallurgical defects visible to the naked eye, no fine crystal bright bands (rings) and obvious coarse and fine stratified structures visible to the naked eye, and the low-power structure meets the requirements. Figure 1 Level 4, no original β grains larger than 0.5mm, low-magnification streamline distribution basically along the shape, no through-flow and severe eddy current, no obvious defects.

[0075] The mechanical properties test is shown in Table 3;

[0076]

[0077] Table 3

[0078] In summary, the Tc32 titanium alloy cake forging forming device provided by the present invention is used to complete the forming production of Tc32 titanium alloy cake forgings. While shortening the forging forming time, it ensures that the final internal structure of the forging meets the requirements, and can effectively improve the coaxiality and ovality of the forging, thereby ensuring that the external dimensions of the forging meet the requirements of the drawing.

[0079] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A Tc32 titanium alloy forging forming device, characterized in that: It includes an upper mold body and a lower mold body that match each other; A working cavity portion with a cross-section of one-third of a circle is provided at corresponding positions of the working surfaces of the upper mold body and the lower mold body; and parameters of the two working cavity portions are consistent.

2. The Tc32 titanium alloy forging forming device according to claim 1, characterized in that: The radius of the working chamber portion is: R=1 / 2*forging diameter+1 / 2*forging positive tolerance.

3. The Tc32 titanium alloy forging forming device according to claim 1, characterized in that: The connection between the working cavity part on the upper mold body and the upper mold body, and the connection between the working cavity part of the lower mold body and the lower mold body both adopt rounded corner transition.

4. The Tc32 titanium alloy forging forming device according to claim 3, characterized in that: The radius of the fillet is in the range of 20 mm to 25 mm.

5. The Tc32 titanium alloy forging forming device according to claim 1, characterized in that: The distance between the rotation center of the working chamber part and the deepest part of the working chamber part is: H=1 / 3*forging diameter+forging hot forging allowance.

6. A method for forming a Tc32 titanium alloy forging, characterized in that: The steps include: Select suitable forging equipment according to the size of forgings; Two sets of suitable flat hammer anvil dies are equipped according to the selected forging equipment; One set of flat hammer anvil molds is manufactured into a required anvil according to the size of the forging, and the anvil is the Tc32 titanium alloy cake forging forming device according to any one of claims 1 to 5; The bar material is subjected to multi-fire heating flat hammer anvil forging and then single-fire heating die anvil forging to obtain the required forgings; performing sandblasting and grinding on the obtained forging; Heat treatment is performed on the forgings after sandblasting and grinding.

7. The Tc32 titanium alloy forging forming method according to claim 6, characterized in that: The heating temperature is 30° C. to 40° C. below the phase transition point.

8. The Tc32 titanium alloy forging forming method according to claim 6, characterized in that: After the obtained forging is sandblasted and polished, the size of the forging is inspected.

9. The Tc32 titanium alloy forging forming method according to claim 6, characterized in that: After heat treatment of forgings, physical and chemical tests are carried out on the forgings.

10. The Tc32 titanium alloy forging forming method as described in claim 6, wherein the specific steps of heat treatment are: keeping at 928°C for 45 minutes and then air cooling, and then keeping at 565°C for 360 minutes and then air cooling.

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