A TC32 titanium alloy forging forming device and method

Abstract

The present invention discloses a Tc32 titanium alloy pie blank forging forming device, comprising a matching upper die and lower die; a working cavity portion with a cross section of one-third of a circle is provided at corresponding positions on the working surfaces of the upper die and the lower die; and the parameters of the two working cavity portions are consistent. The present invention also discloses a Tc32 titanium alloy pie blank forging forming method, comprising the following steps: selecting suitable forging equipment; equipping two sets of suitable flat hammer anvil molds; manufacturing one set of flat hammer anvil molds into the required anvil; subjecting the bar material to multi-fire heated flat hammer anvil forging and then to single-fire heated anvil forging; performing sand blowing and polishing; and performing heat treatment. The Tc32 titanium alloy pie blank forging forming device provided by the present invention is used to complete the forming production of the forging, which, while shortening the forging forming time, 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.

Description

Technical Field

[0001] The present invention relates to the technical field of forging hot working, and in particular to a TC32 titanium alloy cake blank forging forming device and method. Background Art

[0002] The aerospace industry places extremely high demands on material performance, requiring high strength, lightweight construction, and stability in extreme environmental conditions. The properties of TC32 titanium alloy make it suitable for use in the manufacture of certain aircraft and spacecraft components, such as engine parts and structural components. Its corrosion resistance enables it to operate stably and long-term in these harsh environments.

[0003] Conventional forging methods for large, rounded free forgings typically involve selecting suitable bar stock and using a roughing process, followed by rounding and flattening the end faces to complete the large, rounded free forging. This method has the disadvantages of a long forging time, making it difficult to guarantee the coaxiality and ovality of the forgings after forging. More importantly, due to the long forging time or the high number of production runs, the forgings may fail final physical and chemical testing, resulting in high scrap, wasted resources, and impacted completion. While forging is performed solely based on the forging's dimensions, little control is required during the forging process. Conventional forging methods rarely investigate the internal structure and properties of the forgings required by the design. Ensuring that the forgings meet testing requirements for their internal structure and properties after forging and heat treatment is crucial for this product. Summary of the Invention

[0004] The purpose of the present invention is to provide a TC32 titanium alloy cake 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 and a lower die;

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

[0011] The present invention also provides a method for forming a TC32 titanium alloy forging, comprising the following steps:

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

[0013] Equipped with two sets of suitable flat hammer anvil dies 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 above-mentioned TC32 titanium alloy cake forging forming device;

[0015] The bar is forged by a flat hammer anvil with multiple heating steps and then by a die anvil with single heating step to obtain the required forgings.

[0016] performing sand blasting and grinding on the obtained forging;

[0017] Heat treatment is performed on the forgings after sand blasting 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 transition 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: keeping warm at 928°C for 45 minutes and then air cooling, and then keeping warm at 565°C for 360 minutes and then air cooling.

[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. 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the structure of the upper die body in the Tc32 titanium alloy forging forming device of the present invention;

[0025] Figure 2 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 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 This 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 flow chart of the Tc32 titanium alloy cake blank forging forming method of the present invention. DETAILED DESCRIPTION

[0029] The following is a more detailed description of the Tc32 titanium alloy forging forming apparatus and method of the present invention with reference to a schematic diagram, which shows a preferred embodiment of the present invention. It should be understood that those skilled in the art can modify the invention described herein while still achieving the advantageous effects of the present invention. Therefore, the following description should be understood as being generally known to those skilled in the art and not as limiting the present invention.

[0030] The following paragraphs describe the present invention in more detail 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 drawings are greatly simplified and not to exact scale, and are provided solely for the purpose of assisting in the description 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] Specifically, 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 dimension of the universal flat hammer anvil lower die of the selected production equipment; N1 is the width dimension of the universal flat hammer anvil lower die of the selected production equipment; H1 is the height dimension 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. 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 close to the shape of the forging. 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 part 3 thereon to machine an upright one-third circular cake in the center of the upper die body 1 that is close to the shape of the forging. The width of the working cavity part 3 is the same as the width h of the working cavity part 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 rotational 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 transition between the working cavity portion 3 of the upper die body 1 and the upper die body 1, and the transition between the working cavity portion 3 of the lower die body 2 and the lower die body 2, are both rounded. The principle is to select a relatively large rounded corner r as much as possible without affecting the forging process, so as to avoid damaging 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 method for forming a TC32 titanium alloy forging, 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. According to the size of the forging, one set of flat hammer anvil molds is manufactured into the required anvil, wherein the anvil is the above-mentioned TC32 titanium alloy cake forging forming device;

[0044] S4. Forging the bar material with a flat hammer anvil using multiple heating steps and then forging the bar material with a die anvil using a single heating step to obtain the desired forging, wherein the heating temperature is 30° C. to 40° C. below the phase transition point;

[0045] S5, sandblasting and polishing 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 testing on the forgings;

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

[0048] The following is a specific embodiment 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 Ø300mm×840mm into × The specific steps for forging Tc32 titanium alloy billet are as follows:

[0050] Step 1: Select the 2500T fast forging machine according to the size of the forging;

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

[0052] The anvil consists of 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 appropriately adjusted according to the needs of the forging. The working cavity part only needs to be machined and formed on the working surfaces of the upper die body and the lower die body.

[0053] The external dimensions of the upper and lower mold bodies shall be in accordance with the data in Table 1. The clamping shall be carried out in accordance with the general requirements for the flat hammer anvil clamping of general equipment. Table 1 is the dimension parameter table of the upper and lower mold bodies.

[0054]

[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 a one-third circle processed in the center of the lower mold body that is 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]

[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 transition point (β=916), i.e. 976℃×180min;

[0062] Forging size: φ300×840 Forging to: φ ×630±5;

[0063] Forging method: flat hammer anvil forging;

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

[0065] Forging size: φ346×630 Forging to: φ ×420±5

[0066] Forging method: flat hammer anvil forging;

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

[0068] Forging size: φ425×420 forged to φ ×

[0069] Forging method: anvil forging;

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

[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 they pass the physical and chemical tests, they will be put into storage for final inspection.

[0072] The results of physical and chemical tests are shown below:

[0073] High-power optical microscope observation: Primary α phase content: The tissue is all lamellar, no large pieces of transformed α are observed, and there is no needle-like α Widmanstätten tissue.

[0074] Low-magnification optical microscope observation: There are no shrinkage cavities, pores, delamination, segregation, cracks, metal or non-metallic inclusions and other metallurgical defects visible to the naked eye at low magnification, no fine-grained bright bands (rings) visible to the naked eye and obvious stratified structures, no original β grains larger than 0.5mm, and the low-magnification streamline distribution is basically along the shape, without through-flow and severe eddy currents, and 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 may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A method for forming a TC32 titanium alloy forging, characterized in that: The steps include: S1. Select suitable forging equipment according to the size of forgings; S2. Equip two sets of suitable flat hammer anvil dies according to the selected forging equipment; S3, manufacturing one set of flat hammer anvil molds into the required anvil according to the size of the forging; The anvil comprises a matching upper die body and a lower die body; a working cavity portion with a cross section of one-third of a circle is provided at corresponding positions on the working surfaces of the upper die body and the lower die body; and the parameters of the two working cavity portions are consistent; The lower die body utilizes the working cavity portion thereon to machine a raised one-third circular pancake in the center of the lower die body that is similar to the shape of the forging. The width of the working cavity portion on the lower die body is determined according to the thickness of the forging. The upper die body utilizes the working cavity portion thereon to machine a raised one-third circular pancake in the center of the upper die body that is similar to the shape of the forging, and the width of the working cavity portion on the upper die body is the same as that of the working cavity portion on the lower die body; S4, performing multi-fire heating flat hammer anvil forging on the bar material and then performing single-fire heating die anvil forging on the bar material to obtain the desired forging; S5, sand blasting and polishing the obtained forging; S6. Heat treat the forgings after sand blasting and grinding.

2. The Tc32 titanium alloy forging forming method according to claim 1, wherein: The heating temperature is 30° C. to 40° C. below the phase transition point.

3. The Tc32 titanium alloy forging forming method according to claim 1, wherein: In step S5, after sandblasting and grinding, the obtained forging is subjected to dimensional inspection.

4. The Tc32 titanium alloy forging forming method according to claim 1, wherein: After heat treatment, the forgings are subjected to physical and chemical testing.

5. The Tc32 titanium alloy forging forming method according to claim 1, wherein: The specific steps of the heat treatment are: keeping the temperature at 928° C. for 45 minutes and then air cooling, and then keeping the temperature at 565° C. for 360 minutes and then air cooling.

6. The Tc32 titanium alloy forging forming method according to claim 1, wherein: The radius of the working chamber is: R=1 / 2*forging diameter+1 / 2*forging positive tolerance.

7. The Tc32 titanium alloy forging forming method according to claim 1, wherein: The connection between the working cavity part of the upper mold body and the upper mold body, as well as the connection between the working cavity part of the lower mold body and the lower mold body, both adopt rounded corner transition.

8. The Tc32 titanium alloy forging forming method according to claim 7, wherein: The radius of the fillet is in the range of 20 mm to 25 mm.

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