Forging process for titanium alloy arc assembly

Abstract

The application discloses a titanium alloy arc-shaped assembly forging process in the field of arc-shaped assembly forging, compared with a traditional process, the process adds rounding and lengthening, initial forming and bending in the casting link, uses a rounding tool, an initial forming tool and a bending tool, utilizes the rounding tool to further round and lengthen the blank, utilizes the initial forming tool to initially form the middle part of the blank, and utilizes the bending tool to bend the blank to the same angle as the forging die, so that the problems that burrs are generated and material loss is serious in the production of titanium alloy arc-shaped assemblies in the prior art are solved, the amount of raw materials is saved, and the scrap rate of the titanium alloy arc-shaped assemblies is reduced.

Description

Technical Field

[0001] This invention relates to the field of arc-shaped assembly forging technology, and specifically to the forging process of titanium alloy arc-shaped assemblies. Background Technology

[0002] The titanium alloy arc-shaped assembly, made of titanium alloy, is an important component of aero engines. The titanium alloy arc-shaped assembly is shaped like an obtuse triangle, as shown in the attached image. Figure 8 As shown. In the existing technology for manufacturing titanium alloy arc-shaped assemblies, a Φ250 gauge bar purchased according to the Q / S10-0342-2004 standard is first heated. After heating, a worker uses a 750kg air hammer to freely forge the bar, transforming it into a billet with a length of 860±5mm and a φ of 90±3. The billet is then directly heated and placed in a forging die for initial forging. After initial forging, the billet is reheated and placed in the forging die for final forging until the final shape is achieved. The existing technology results in a high scrap rate for titanium alloy arc-shaped assemblies. This is because, during the direct forging process using the existing technology, the bar is a cylindrical billet after free forging by the worker. However, the forging die, as the final forming tool for the titanium alloy arc-shaped assembly, has a shape that is inconsistent with the shape of the forging die. Figure 8 Similarly, when a cylindrical billet is hammered into the forging die, due to the difference in shape between the billet and the forging die, a portion of the billet cannot enter the forging die during the direct forging process, resulting in flash (also known as overflow, burrs, etc., which mostly occur at the parting points of the die, such as the parting surface between the moving and stationary dies, the sliding parts of the slider, the gaps of inserts, the gaps of ejector pins, etc.). The generation of flash causes the billet in the forging die to not be completely filled. In order to avoid the problem of the billet in the forging die not being completely filled, the existing technology adopts the method of increasing the amount of bar stock used to reduce the scrap rate of titanium alloy arc-shaped assemblies. However, the flash problem still exists, and at the same time, it increases the consumption of raw materials. Summary of the Invention

[0003] The present invention aims to provide a forging process for titanium alloy arc-shaped assemblies to solve the problems of flash and severe material loss in the production of titanium alloy arc-shaped components.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a forging process for titanium alloy arc-shaped assemblies, comprising the following steps:

[0005] (1) Heat the bar stock that meets the specifications to 930-950℃ in a box furnace and hold for 70-150 minutes;

[0006] (2) The worker clamps the bar after step (1) and uses an air hammer to forge it freely. The length of the forged billet is 860±5mm and the φ is 90±3mm. Then the billet is heated to 930~950℃ in a box furnace and held for 35~75min.

[0007] (3) Rolling and elongating: First step, roll the blank after completing step (2) using a rolling tool. The rolling tool includes an upper rolling die and a lower rolling die. The upper rolling die is located directly above the lower rolling die. Both the upper rolling die and the lower rolling die have a semi-circular groove at their center. The blank is clamped and placed in the semi-circular groove. After the upper rolling die is attached to the blank and corresponds to the lower rolling die, the upper rolling die is repeatedly hammered with an air hammer. The blank is clamped and moved in the axial direction of the rolling tool until the blank becomes cylindrical.

[0008] The second step is to use a forming fixture to perform initial forming on the rounded blank. The forming fixture includes an upper forming die and a lower forming die. The upper forming die and the lower forming die are provided with a concave groove at their center. The diameter of the concave groove is 80±5mm and the width is 100±5mm. The sidewalls of the concave groove are symmetrically inclined inward. The middle part of the blank is placed into the lower die of the forming fixture. After the upper forming die is attached to the blank and corresponds to the lower forming die, the blank is repeatedly hammered and forged with an air hammer until the middle part of the blank is hammered and formed.

[0009] The third step is to repeat the first step on both ends of the initial blank using the rolling tool.

[0010] (4) Reheat the blank after completing step (3) to 930-950℃ and keep it warm for 50-100 minutes. Use a bending fixture to bend the blank after keeping it warm. The bending fixture is located on the punch press. The bending fixture includes an upper bending die and a lower bending die. The lower bending die is concave. The lowest point of the concave shape is arc-shaped. The angle of the arc bending is 129°. The shape of the upper bending die is adapted to the lower bending die. The center of both the upper bending die and the lower bending die is provided with a concave strip. The φ at the center of the concave strip is 80±5mm and the length is 100±5mm. The φ at both ends of the concave strip is 45±5mm. The diameter of the middle part of the concave strip gradually decreases to the diameter of the end of the concave strip. Place the blank horizontally in the middle concave strip position of the bending fixture. Start the punch press. The punch press drives the upper bending die to move downward and squeeze the blank into the lower bending die until the blank is bent and formed. The blank making is initially completed.

[0011] (5) After completing step (4), the billet is coated with titanium alloy protective coating and then heated to 930-950℃ and held for 40-100 minutes. The heated billet is placed in the forging die on the press and the press is used to perform initial forging. After the initial forging is completed, the billet is heated to 930-950℃ and held for 20-60 minutes. The heated billet is placed in the forging die on the press and the press is used to perform final forging, so that the billet is formed and the edges are trimmed to complete the final forging.

[0012] (6) Place the forging after step (5) into a box furnace and heat it to 790-810°C. Hold it for 110-130 minutes. After holding, place the forging in the air to cool and complete the forging of the titanium alloy arc assembly.

[0013] The beneficial effects of the present invention are as follows: The forging process of the titanium alloy arc-shaped assembly described in the present invention adds rolling and elongation, initial forming and bending in the blank preparation stage. The blank preparation is initially completed by using rolling tooling, forming tooling and bending tooling, so that the blank can be adapted to the forging die. This avoids the situation of flash and missing material caused by directly forging the horizontal blank in the forging die in the prior art, saves the amount of raw materials used and reduces the scrap rate of titanium alloy arc-shaped components.

[0014] Furthermore, a spring is connected to the center of the inner bottom of the lower rolling die, and the spring extends upward through the lower rolling die. Multiple support seats are evenly connected to the outer bottom of the lower rolling die. The spring design allows the billet to bounce upward under the action of the spring after the air hammer hammers downward, creating a gap between the upper and lower rolling dies, which facilitates the movement of the billet within the rolling fixture. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the rolling tooling used in the forging process of the titanium alloy arc-shaped assembly of the present invention.

[0016] Figure 2 for Figure 1 A partial sectional view of the lower die for rolling;

[0017] Figure 3 This is a schematic diagram of the elongation tooling used in the forging process of the titanium alloy arc-shaped assembly of the present invention.

[0018] Figure 4 This is a schematic diagram of the bending fixture used in the forging process of the titanium alloy arc-shaped assembly of the present invention.

[0019] Figure 5 This is a diagram showing the effect of rounding and elongating the titanium alloy arc-shaped assembly after forging in the forging process of the present invention.

[0020] Figure 6 This is a diagram showing the initial forming effect of the titanium alloy arc-shaped assembly after forging process according to the present invention.

[0021] Figure 7 This is a preliminary blanking effect diagram in the forging process of the titanium alloy arc-shaped assembly of the present invention;

[0022] Figure 8 This is a schematic diagram showing the dimensions of a titanium alloy arc-shaped assembly. Detailed Implementation

[0023] The following detailed description illustrates the specific implementation method:

[0024] The reference numerals in the accompanying drawings include: 1. Rolling upper mold; 2. Rolling lower mold; 3. Support base; 4. Forming upper mold; 5. Forming lower mold; 6. Bending upper mold; 7. Bending lower mold.

[0025] This embodiment is basically as shown in the appendix. Figure 1 - Appendix Figure 6 As shown, the forging process for titanium alloy arc-shaped assemblies includes the following steps:

[0026] (1) Heat the bar stock that meets the specifications to 930-950℃ in a box furnace and hold for 70-150 minutes;

[0027] (2) The worker clamps the bar after step (1) and uses an air hammer to forge it freely. The length of the forged billet is 860±5mm and the φ is 90±3mm. Then the billet is heated to 930~950℃ in a box furnace and held for 35~75min.

[0028] (3) Rolling and elongating: First step, roll the blank completed in step (2) using a rolling tool. The rolling tool includes an upper rolling die 1 and a lower rolling die 2. The upper rolling die 1 is located directly above the lower rolling die 2. Both the upper rolling die 1 and the lower rolling die 2 have a semi-circular groove at their center. A spring is fixedly connected to the center of the inner bottom of the lower rolling die 2. The spring passes through the lower rolling die 2 upwards. Multiple support seats 3 are evenly fixedly connected to the outer bottom of the lower rolling die 2. The blank is clamped and placed in the semi-circular groove. After the upper rolling die 1 is attached to the blank and corresponds to the lower rolling die 2, the upper rolling die 1 is repeatedly hammered with an air hammer. The blank is clamped and moved in the axial direction of the rolling tool until the blank becomes cylindrical.

[0029] The second step is to use a forming fixture to perform initial forming on the rounded blank. The forming fixture includes an upper forming die 4 and a lower forming die 5. The upper forming die 4 and the lower forming die 5 are provided with concave grooves at their centers. The diameter of the concave groove is 80±5mm and the width is 100±5mm. The sidewalls of the concave groove are symmetrically inclined inward. The middle part of the blank is placed into the lower die of the forming fixture. After the upper forming die 4 is attached to the blank and corresponds to the lower forming die 5, the blank is repeatedly hammered and forged with an air hammer until the middle part of the blank is hammered and formed.

[0030] The third step is to repeat the first step on both ends of the initial blank using the rolling tool.

[0031] (4) The blank after step (3) is reheated to 930-950℃ and kept warm for 50-100 minutes. The blank after being kept warm is bent using a bending fixture. The bending fixture is located on a punch press. The bending fixture includes an upper bending die 6 and a lower bending die 7. The lower bending die 7 is an arc-shaped concave shape with an arc bending angle of 129°. The shape of the upper bending die 6 is adapted to the lower bending die 7. Both the upper bending die 6 and the lower bending die 7 have concave strips at their center. The φ at the center of the concave strip is 80±5mm, the length is 100±5mm, and the φ at both ends of the concave strip is 45±5mm. The diameter of the middle part of the concave strip gradually decreases to the diameter of the end of the concave strip. The blank is placed horizontally in the middle concave strip position of the bending fixture. The punch press is started. The punch press drives the upper bending die 6 to move downward and squeeze the blank into the lower bending die 7 until the blank is bent and formed. The blank making is initially completed.

[0032] (5) After completing step (4), the billet is coated with titanium alloy protective coating and then heated to 930-950℃ and held for 40-100 minutes. The heated billet is placed in the forging die on the press and the press is used to perform initial forging. After the initial forging is completed, the billet is heated to 930-950℃ and held for 20-60 minutes. The heated billet is placed in the forging die on the press and the press is used to perform final forging, so that the billet is formed and the edges are trimmed to complete the final forging.

[0033] (6) Place the forging after step (5) into a box furnace and heat it to 790-810°C. Hold it for 110-130 minutes. After holding, place the forging in the air to cool and complete the forging of the titanium alloy arc assembly.

[0034] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A forging process for titanium alloy arc-shaped assemblies, characterized in that, Includes the following steps: (1) Heat the bars that meet the specifications to 930-950℃ in a box furnace and hold for 70-150 minutes; (2) The worker clamps the bar stock after step (1) and uses an air hammer to forge it freely. The length of the forged billet is 860±5mm and the φ is 90±3mm. Then the billet is heated to 930~950℃ in a box furnace and held for 35~75min. (3) Rolling and elongating: First step, use rolling tooling to roll the blank after completing step (2). The rolling tooling includes an upper rolling die and a lower rolling die. The upper rolling die is located directly above the lower rolling die. The center of both the upper rolling die and the lower rolling die is provided with a semi-circular groove. The blank is clamped and placed in the semi-circular groove. After the upper rolling die is attached to the blank and corresponds to the lower rolling die, the upper rolling die is repeatedly hammered with an air hammer. The blank is clamped and moved in the axial direction of the rolling tooling until the blank becomes cylindrical. The second step is to use a forming fixture to perform initial forming on the rounded blank. The forming fixture includes an upper forming die and a lower forming die. The upper forming die and the lower forming die are provided with a concave groove at their center. The diameter of the concave groove is 80±5mm and the width is 100±5mm. The sidewalls of the concave groove are symmetrically inclined inward. The middle part of the blank is placed into the lower die of the forming fixture. After the upper forming die is attached to the blank and corresponds to the lower forming die, the blank is repeatedly hammered and forged with an air hammer until the middle part of the blank is hammered and formed. Third step: Repeat the first step on both ends of the initial blank using the rounding tool; (4) Reheat the blank after completing step (3) to 930-950℃ and keep it warm for 50-100 minutes. Use a bending fixture to bend the blank after keeping it warm. The bending fixture is located on the punch press. The bending fixture includes an upper bending die and a lower bending die. The lower bending die is concave. The lowest point of the concave shape is arc-shaped. The angle of the arc bending is 129°. The shape of the upper bending die is adapted to the lower bending die. The center of both the upper bending die and the lower bending die is provided with a concave strip. The φ at the center of the concave strip is 80±5mm, the length is 100±5mm, and the φ at both ends of the concave strip is 45±5mm. The diameter of the middle part of the concave strip gradually decreases to the diameter of the end of the concave strip. Place the blank horizontally in the middle concave strip position of the bending fixture, start the punch press, and the punch press drives the upper bending die to move downward to squeeze the blank into the lower bending die until the blank is bent and formed. The blank making is initially completed. (5) After completing step (4), the billet is coated with titanium alloy protective coating and then heated to 930-950℃ and held for 40-100 minutes. The heated billet is placed in the forging die on the press and the press is used to perform initial forging. After the initial forging is completed, the billet is heated to 930-950℃ and held for 20-60 minutes. The heated billet is placed in the forging die on the press and the press is used to perform final forging, so that the billet is formed and the edges are trimmed to complete the final forging. (6) Place the forging after step (5) into a box furnace and heat it to 790-810°C. Hold it for 110-130 minutes. After holding, place the forging in the air to cool and complete the forging of the titanium alloy arc assembly.

2. The forging process of the titanium alloy arc-shaped assembly according to claim 1, characterized in that: A spring is connected to the center of the inner bottom of the rolling lower mold, and the spring passes through the rolling lower mold upward. Multiple support seats are evenly connected to the outer bottom of the rolling lower mold.

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