Large titanium alloy blisk combined moulding bed

Abstract

The utility model belongs to the technical field of forging of titanium alloy blisk forgings, and particularly relates to a large titanium alloy blisk combined moulding bed. Comprising a center cushion block (1), a moulding bed (2), a punch (3) and a positioning block (4), the upper section of a cavity of the moulding bed (2) has mold stripping inclination, and the lower section of the cavity of the moulding bed (2) has forming inclination; a first annular groove and a second annular groove are sequentially formed in the lower end face of the punch (3) from inside to outside, and a sharp corner is reserved on the outer edge of the second annular groove. The positioning block (4) is annularly arranged at the lower section of the cavity of the moulding bed (2); a circular boss is arranged at the lower end of the center cushion block (1), and the outer side of the boss is in clearance fit with the inner side face of the positioning block (4).

Description

Technical Field

[0001] The utility model belongs to the technical field of forging of titanium alloy integral blisk forgings, and particularly relates to a large-sized titanium alloy integral blisk combined die. Background Art

[0002] Due to its high specific strength, light weight and high corrosion resistance, titanium alloy is widely used in various fields such as aerospace and shipbuilding. TC17 alloy belongs to an α-β type two-phase titanium alloy rich in β-stabilizing elements, and has high strength, high hardenability and excellent fracture toughness. It is mainly used to manufacture engine fans, compressor disks and large-section forgings. Due to the relatively large size of this alloy forging, during the deformation process from the blank to the forging, the deformation of each part of the forging is uneven. Content of the Utility Model

[0003] Purpose of the utility model: To provide a large-sized titanium alloy integral blisk combined die to ensure that the properties of the forging meet the requirements and ensure that during the deformation process from the blank to the forging, the deformation of each part of the forging is uniform.

[0004] Technical Solution:

[0005] A large-sized titanium alloy integral blisk combined die includes: a center spacer block 1, a die 2, a punch 3, and a positioning block 4. Among them, the upper section of the cavity of the die 2 has a draft angle, and the lower section has a forming angle; on the lower end face of the punch 3, a first annular groove and a second annular groove are sequentially arranged from the inside to the outside. Among them, a sharp corner is reserved on the outer edge of the second annular groove; the positioning block 4 is annularly arranged at the lower section of the cavity of the die 2; a circular boss is provided at the lower end of the center spacer block 1, and the outer side of the boss is in clearance fit with the inner side face of the positioning block 4.

[0006] Further, the included angle between the contact surface of the positioning block 4 and the lower section of the cavity of the die 2 and the horizontal plane is 70-80°.

[0007] Further, the forming angle is 60°±5°.

[0008] Further, the draft angle is 3°.

[0009] Further, the outer edge of the second annular groove is arc-shaped.

[0010] Further, the punch 3 is in clearance fit with the die 2, and the unilateral clearance is 0.8-1.0 mm.

[0011] Advantageous Effects:

[0012] The utility model provides a combined die for a large-sized titanium alloy integral blisk, and uses the combined die for split "blank making by die", and the forging process consists of upsetting, die forging and die forging, saving various machining processes such as machining flash and machining positioning in the middle, shortening the production cycle, and the split "blank making by die" has a short manufacturing cycle, convenient and reliable assembly, stable use process, reducing the forging economic cost and shortening the production cycle. Brief Description of the Drawings

[0013] Figure 1 It is the assembly drawing of the blank making die;

[0014] Figure 2 It is the forging drawing of the titanium alloy blisk. Detailed Description of the Invention

[0015] The utility model focuses on forgings of this shape (such as Figure 1 ), and from the perspectives of cost saving, cycle shortening and forming guarantee, a combined die for a large-sized titanium alloy integral blisk is designed. By split "blank making by die", the deformation amount of each part of the forging is ensured to be uniform, and the machining processes are reduced. The "center cushion block", "punch", "positioning block" and "die" ensure the rough size and shape, avoiding processes such as machining flash and machining positioning after blank making. Upsetting, die forging and die forging can be directly carried out, saving various intermediate machining processes.

[0016] Such as Figure 1 , a combined die for a large-sized titanium alloy integral blisk includes: a center cushion block 1, a die 2, a punch 3, and a positioning block 4. Among them, the upper section of the cavity of the die 2 has a draft angle for demolding, and the lower section has a forming angle; the lower end face of the punch 3 is sequentially provided with a first annular groove and a second annular groove from inside to outside. Among them, the outer edge of the second annular groove retains a sharp angle; the positioning block 4 is annularly arranged at the lower section of the cavity of the die 2; the lower end of the center cushion block 1 is provided with a circular boss, and the outer side of the boss is in clearance fit with the inner side face of the positioning block 4.

[0017] The contact surface between the positioning block 4 and the lower section of the cavity of the die 2 forms an angle of 70 - 80° with the horizontal plane.

[0018] The forming angle is 60° ± 5°.

[0019] The draft angle for demolding is 3°.

[0020] The outer edge of the second annular groove is arc-shaped.

[0021] The punch 3 is in clearance fit with the die 2, and the unilateral clearance is 0.8 - 1.0 mm.

[0022] The forging method using the above-mentioned combined die for a large-sized titanium alloy integral blisk includes:

[0023] The first step is to machine the center cushion block 1, the punch 3, and the positioning block 4, with the shape asFigure 1 As shown, the central spacer block 1 is directly machined from a round bar stock of Φ400×150; the punch 3 is upset and rolled from a bar stock of Φ500×200 and forged to Φ780×80, and then machined. It is necessary to ensure that the edge is Figure 1 a sharp angle; the positioning block 4 is machined from a blank of Φ650×20;

[0024] In the second step, the die is machined, and the shape is as Figure 1 shown in Figure 2. The die 2 is a cylindrical material of Φ850×Φ200×310, and the hole is enlarged to ≥Φ1010×Φ590×320 using a hole enlarging machine, and then machined. After machining, the die and the accessories 1, 2, 3, and 4 need to be heat-treated to ensure a hardness of HRC: 38 - 42.

[0025] In the third step, assembly: The die 2 and the positioning block 4 are assembled by relying on a 70° - 80° inclined plane, and the assembly gap is 0.8 - 1.0 mm. After the central spacer block 1 installs the die 2 and the positioning block 4, it is placed;

[0026] In the fourth step, upsetting: Use a quick forging machine to upset the round bar stock. The deformation temperature is 30°C ± 5°C below the phase transformation point. After the forging piece is insulated, the bar stock is upset into a cake and rolled into a circle to ~ Considering the deformation amount per heating, it is realized in 3 heating times;

[0027] In the fifth step, die forging: Use a press for forging. The deformation temperature is 30°C ± 5°C below the phase transformation point. After the forging piece is insulated, place the blank in the die as Figure 1 shown. Set the downward pressing speed to 5 mm / s. After the upper flat die presses it flat, lift the hammer, put in the punch 3, and press until the underpressure ≤ 2 mm, which is completed in 1 heating;

[0028] In the sixth step, die forging: Use a press for forging. The deformation temperature is 30°C ± 5°C above the phase transformation point. After the forging piece is insulated, place the billet after die forging in the final forging die. The pressing speed is 1 mm / s, press until the underpressure is 1 mm, and hold the pressure for 60 s, which is completed in 1 heating. The shape of the forging piece is as Figure 2 shown;

[0029] The cooling method is to pad and air-cool.

[0030] Example:

[0031] The technical solution of the present invention will be further described in detail below in conjunction with the examples:

[0032] Prepare a TC17 titanium alloy integral blisk forging, as Figure 2 shown. The outer diameter of the forging The axial dimension is 241 mm, and the projected area is about 0.66 m 2 .

[0033] The forging steps are detailed as follows:

[0034] The first step is upsetting. Use a quick forging machine to upset the round bar stock. The deformation temperature is 30°C ± 5°C below the phase transformation point. After the forging is insulated, from the bar stock is upset into a cake and rolled round to~ Considering the deformation amount per heat, it is achieved in 3 heats. Pad it up for air cooling. If the hot stock in the middle heat is returned to the furnace, it needs to be cooled for 10 - 15 minutes. The purpose of this step of operation is to reduce the height-diameter ratio, avoid excessive local deformation amount of the forging and abnormal twisting deformation of the forging during the subsequent production process, etc.;

[0035] The second step is to adopt the designed split "die for preforming". Use a press for forging. The deformation temperature is 30°C ± 5°C below the phase transformation point. After the forging is insulated, place the blank in the die such as Figure 1 inside, set the downward pressing speed at 5 mm / s. After the upper flat die flattens it, lift the hammer, put in punch 3, press until the underpressure ≤ 2 mm, and complete it in 1 heat. In this step of operation, by using the die punch, the shape of the blank is changed to reserve the deformation amount for the subsequent die forging process. Keeping sharp corners at the edge of punch 3 is to prevent curling during the pressing process and ensure that the punch can be taken out easily;

[0036] The third step is die forging. Use a press for forging. The deformation temperature is 30°C ± 5°C above the phase transformation point. After the forging is insulated, place the blank after die forging in the final forging die. The pressing speed is 1 mm / s, press until the underpressure is 1 mm, hold the pressure for 60 s, and complete it in 1 heat. The shape of the forging is as Figure 2 , and the equipment tonnage is 18000 t - 20000 t;

[0037] The forming method of the forging can be directly completed from the bar stock through upsetting into a cake, die forging, and die forging. The process is smooth, the quality of the forging is stable, ensuring the tissue uniformity, saving the forging economic cost, shortening the production cycle. After testing, the dimensions of the forging meet the requirements of the drawing, and the performance meets the indicators, greatly improving the traditional forging process's thinking that relies on machining, and eliminating the machining processes such as the burr between processes and positioning machining during the forging process.

Claims

1. A large titanium alloy integral blade disk assembly mold, characterized in that: include: A center pad (1), a tire mold (2), a punch (3), and a positioning block (4), wherein the upper section of the mold cavity of the tire mold (2) has a demoulding slope, and the lower section has a forming slope; the lower end surface of the punch (3) is provided with a first annular groove and a second annular groove in sequence from the inside to the outside, wherein the outer edge of the second annular groove retains a sharp corner; the positioning block (4) is arranged in an annular shape at the lower section of the mold cavity of the tire mold (2); a circular boss is provided at the lower end of the center pad (1), and the outer side of the boss is clearance-matched with the inner side surface of the positioning block (4).

2. The large titanium alloy blisk assembly mold according to claim 1 is characterized in that: The contact surface between the positioning block (4) and the lower section of the mold cavity of the tire mold (2) is at an angle of 70-80° to the horizontal plane.

3. The large titanium alloy blisk assembly mold according to claim 1 is characterized in that: The forming slope is 60°±5°.

4. The large titanium alloy blisk assembly mold according to claim 1 is characterized in that: The draft angle is 3°.

5. The large titanium alloy blisk assembly mold according to claim 4 is characterized in that: The outer edge of the second annular groove is arc-shaped.

6. The large titanium alloy blisk assembly mold according to claim 1 is characterized in that: The punch (3) and the tire mold (2) are matched with each other in clearance, and the single-side clearance is 0.8-1.0 mm.

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