A Titanium Alloy High-Temperature Side Pressing and Shape-Correcting Device and Method

Abstract

The present invention provides a high-temperature side pressing and straightening device and method for titanium alloy, belonging to the technical field of process equipment design and manufacturing. The device consists of two completely symmetrical and identically configured parts on the left and right, and a sealing tooling in the middle. By applying pressure to the side of the part and under the combined action of temperature, the present invention applies side straightening to the part to ensure that parts with side forming accuracy requirements can achieve side straightening while removing stress during heat treatment. The present invention solves the problem in the prior art that only stress relief heat treatment can be carried out and part straightening cannot be achieved. The device is simple and practical, can be combined with various high-temperature forming equipment for titanium alloy, gives full play to the functions of the high-temperature forming equipment for titanium alloy, is safe and reliable in operation, further reduces the labor intensity of workers, effectively guarantees the forming quality of parts, and enables the finally manufactured parts to meet multiple requirements such as forming accuracy, surface quality, mechanical properties, and service performance.

Description

Technical Field

[0001] The present invention belongs to the technical field of process equipment design and manufacturing, and relates to a high-temperature side pressing and shape correcting device and method for titanium alloy parts. Background Art

[0002] At present, vacuum heat treatment process is mostly used to eliminate stress of titanium alloy parts. The titanium alloy parts are clamped on the heat treatment die and placed in a vacuum heat treatment furnace. This method can release the stress generated during the processes of forming, welding, etc. of the parts, but the shape correcting function cannot be realized. After the parts are heat treated, deformation still exists. If shape correction is required, hot forming equipment is mostly used for hot pressing and shape correction. However, the hot forming equipment usually applies hydraulic pressure up and down to correct the parts in the up and down directions, and pressure cannot be applied to the parts such as box-shaped parts and cylindrical parts that require side pressing. At the same time, the hot shape correcting equipment does not have a vacuum environment, and it is easy to cause oxidation of titanium alloy parts during the shape correcting process. After shape correction, vacuum annealing treatment is still required. The whole process has a long flow, which affects the performance and forming accuracy of the parts. Therefore, there is an urgent need for an innovative high-temperature side pressing and shape correcting device and method for titanium alloy parts to realize the elimination of stress of titanium alloy parts while also being able to perform accurate side pressing, improve the forming accuracy and quality of the parts, and improve the manufacturing qualification rate of the parts. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a high-temperature side pressing and shape correcting device and method for titanium alloy parts. The device and method apply lateral pressure to titanium alloy parts at high temperature, cooperate with hot forming equipment, realize all-directional compression of titanium alloy parts, can not only eliminate the stress after forming and welding of the parts, but also realize the shape correction of the parts. At the same time, a vacuum environment can be realized in the furnace cavity of ordinary hot forming equipment to prevent high-temperature oxidation of the parts, ensure the forming quality and accuracy of titanium alloy parts, and improve the manufacturing qualification rate of the parts.

[0004] To solve the above problems, the technical solution of the present invention is as follows:

[0005] A high-temperature side pressing and shape correcting device for titanium alloy parts is composed of two completely symmetrical and identically arranged parts on the left and right and a middle sealing tooling. Taking one side as an example to illustrate its specific structure, it includes a bracket 1, a bottom angle fixing device 2, a front-end guide 3, a front-end guide clamping block 4, a front-end side pressing column 5, an asbestos heat insulation board 6, a rear-end guide 7, a rear-end guide clamping block 8, a rear-end guide fixing block 9, a rear-end side pressing column 10, a stop block 11 and a hydraulic system 12.

[0006] The bracket 1 is fixed on the foundation; a bottom angle fixing device 2 is installed at the front end of the bracket 1, and the bottom angle fixing device 2 is installed on the foundation or clamped on the pillar of the hot forming equipment to ensure that the high-temperature side pressing and shape correcting device can be stably fixed on the ground.

[0007] The front-end guide 3 is connected to the top of the bracket 1, and the front-end guide 3 is connected to the front-end guide clamping block 4; the two clamp the front-end side pressure column 5 to achieve the stable movement of the front-end side pressure column 5.

[0008] The rear-end guide 7 is connected to the bracket 1 through the rear-end guide fixing block 9; the rear-end guide 7 is connected to the rear-end guide clamping block 8, and the two clamp the rear-end side pressure column 10 to achieve the stable movement of the rear-end side pressure column 10.

[0009] The hydraulic system 12 is fixed on the bracket 1, and the hydraulic system 12 is connected to one end of the front-end side pressure column 5 to deliver pressure to the front-end side pressure column 5 to achieve the action of the front-end side pressure column 5 ejecting or retracting; the other end of the front-end side pressure column 5 is connected to the rear-end side pressure column 10, and the movement of the front-end side pressure column 5 drives the movement of the rear-end side pressure column 10 to achieve the rear-end side pressure column 10 ejecting and pressing on the part or retracting and reducing pressure.

[0010] An asbestos heat insulation board 6 is installed between the front-end side pressure column 5 and the rear-end side pressure column 10 to ensure that the front-end side pressure column 5 and the hydraulic system 12 are isolated from high temperature.

[0011] The stop block 11 is installed on the side furnace door of the hot forming equipment, which functions to insulate heat and facilitate the installation, disassembly and maintenance of the high-temperature side pressure straightening device.

[0012] The sealing tooling is placed in the hot forming equipment, and the sealing tooling is a box structure composed of a sealing tooling base 13 and a sealing tooling upper cover 14. Among them, sealing through holes 15 with sealing functions are symmetrically designed on both sides of the sealing tooling base 13, and the rear-end side pressure column 10 passes through the hot forming equipment and the sealing through holes 15 in sequence and acts on the part placed in the sealing tooling base 13. Vent holes 16 are provided at the bottom corners of the sealing tooling base 13 for introducing argon or evacuating the air in the sealing tooling to prevent the part from oxidizing. Two rows of sealing strips 17 are provided at the edge of the sealing tooling upper cover 14, which are coupled with the sealing grooves 18 at the edge of the sealing tooling base 13 to ensure that when the sealing tooling upper cover 14 and the sealing tooling base 13 are closed, the whole sealing tooling is airtight.

[0013] The method for stress relieving and straightening of titanium alloy parts using the above high-temperature side pressure straightening device includes the following steps:

[0014] 1) Place the sealing tooling base 13 on the platform of the hot forming equipment, and load the part to be straightened into the sealing working base 13.

[0015] 2) Adjust the height of the hot forming equipment platform so that the rear side pressing column 10 passes through the sealing through hole 15 and enters the sealing tooling base 13. Adjust the hydraulic system 12, and adjust the rear side pressing column 10 to the position where calibration is required through the front side pressing column 5, and apply pressure to hold the part. If the surface of the part to be calibrated is relatively complex, a simple tooling that fits the surface to be calibrated can be pre-made, assembled with the part and then installed in the sealing tooling base 13. Then adjust the hydraulic system 12 so that the rear side pressing column 10 applies pressure to the simple tooling, and calibrate the entire surface of the part by applying force to the simple tooling.

[0016] 3) Assemble the sealing tooling upper cover 14 to the sealing working base 13, and connect the ventilation hole 16 to a vacuum pump or an argon gas cylinder through a ventilation pipe.

[0017] 4) Lower the upper platform of the hot forming equipment onto the sealing tooling upper cover 14 and apply a certain pressure to ensure that the sealing tooling is airtight.

[0018] 5) Close the front, rear, and both side furnace doors of the hot forming equipment and heat; when heated to the specified temperature, start heat preservation.

[0019] 6) During the heating process, introduce high-purity argon gas or evacuate the sealing tooling to prevent the part from oxidizing.

[0020] 7) After the temperature stabilizes, adjust the hydraulic system 12, and apply the required lateral pressure to the part in the sealing tooling through the front side pressing column 5 and the rear side pressing column 10 to perform lateral calibration on the part.

[0021] 8) After calibration, cool down; when the temperature drops to 100 °C, release the pressure of the hydraulic system 12, retract the rear side pressing column 10, open the furnace door of the hot forming equipment, take out the sealing tooling, and take out the part.

[0022] Advantages of the present invention: The titanium alloy high-temperature side pressing calibration device provided by the present invention applies pressure laterally to the part. Under the combined action of temperature, lateral calibration is applied to the part to ensure that parts with lateral forming accuracy requirements can achieve lateral calibration while removing stress during heat treatment. The present invention solves the problem in the prior art that only stress relief heat treatment can be performed and part calibration cannot be achieved. The device is simple and practical, can be used in combination with various titanium alloy high-temperature forming equipment, gives full play to the functions of titanium alloy high-temperature forming equipment, is safe and reliable in operation, further reduces the labor intensity of workers, effectively guarantees the forming quality of parts, and enables the finally manufactured parts to meet multiple requirements such as forming accuracy, surface quality, mechanical properties, and service performance. Description of the Drawings

[0023] Figure 1 It is a schematic diagram of the overall titanium alloy high-temperature side pressing calibration device.

[0024] Figure 2Schematic diagram of sealing tooling.

[0025] Figure 3 Schematic diagram of the sealing tooling base.

[0026] Figure 4 This is a schematic diagram of the sealing tool cover.

[0027] Among them: 1 bracket; 2 bottom angle fixing device; 3 front end guide; 4 front end guide clamping block; 5 front end side pressure column; 6 asbestos insulation board; 7 rear end guide; 8 rear end guide clamping block; 9 rear end guide fixing block; 10 rear end side pressure column; 11 block; 12 hydraulic system; 13 sealing tool base; 14 sealing tool upper cover; 15 sealing through hole; 16 vent hole; 17 sealing belt; 18 sealing groove. DETAILED DESCRIPTION

[0028] The specific implementation of the present invention is further explained below in conjunction with the examples and drawings, but is not intended to limit the present invention.

[0029] like Figure 1 A titanium alloy high-temperature side pressure correction device is shown, which consists of two parts that are completely symmetrical and have the same settings on the left and right. Taking one side as an example, its specific structure includes a bracket 1, a bottom angle fixing device 2, a front end guide 3, a front end guide clamp 4, a front end side pressure column 5, an asbestos insulation board 6, a rear end guide 7, a rear end guide clamp 8, a rear end guide fixing block 9, a rear end side pressure column 10, a block 11 and a hydraulic system 12; it also includes a sealing tool.

[0030] Among them, the bracket 1 is fixed to the foundation by anchor nuts and bolts, and a bottom angle fixing device 2 is installed at the front end of the bracket 1. The clamping nails in the bottom angle fixing device 2 are installed on the foundation or clamped on the pillars of the hot forming equipment to ensure that the high-temperature side pressure correction device can be stably fixed on the ground.

[0031] Among them, the front end guide 3 is connected to the top of the bracket 1 through a hexagonal bolt, and the front end guide 3 is connected to the front end guide clamp 4 through a hexagonal bolt, and the two clamp the front end side pressure column 5 to achieve stable movement of the front end side pressure column 5.

[0032] Among them, the rear end guide 7 is connected to the bracket 1 through the rear end guide fixing block 9; the rear end guide 7 and the rear end guide clamping block 8 are connected through hexagonal bolts, and the two clamp the rear end side pressure column 10, and finally realize the stable movement of the rear end side pressure column 10.

[0033] Among them, the hydraulic system 12 is fixed to the bracket 1 by bolts. The hydraulic system 12 is connected to one end of the front-end side pressure column 5, and delivers pressure to the front-end side pressure column 5 to realize the ejection or retraction of the front-end side pressure column 5. The other end of the front-end side pressure column 5 is connected to the rear-end side pressure column 10. The movement of the front-end side pressure column 5 drives the movement of the rear-end side pressure column 10, so as to realize the ejection and pressing of the rear-end side pressure column 10 against the part or the retraction and pressure reduction.

[0034] Among them, an asbestos heat insulation board 6 is installed between the front-end side pressure column 5 and the rear-end side pressure column 10 to ensure that the front-end side pressure column 5 and the hydraulic system 12 are isolated from high temperature.

[0035] Among them, the stop block 11 is installed on the side furnace door of the hot forming equipment, which functions to insulate heat and facilitate the installation, disassembly and maintenance of the high-temperature side pressure straightening device.

[0036] As Figure 2 shown, the sealing tooling is a box structure composed of a sealing tooling base 13 and a sealing tooling upper cover 14. Among them, sealing through holes 15 with sealing functions are symmetrically designed on both sides of the sealing tooling base 13. The rear-end side pressure column 10 passes through the through holes and acts on the part placed in the sealing tooling base 13. Vent holes 16 are provided at the bottom corners of the sealing tooling base 13 for introducing argon or evacuating the air in the sealing tooling to prevent the part from oxidizing.

[0037] As Figure 3 and Figure 4 shown, two rows of sealing strips 17 are provided at the edge of the sealing tooling upper cover 14, which are coupled with the sealing grooves 18 designed at the edge of the sealing tooling base 13 to ensure that when the sealing tooling upper cover 14 and the sealing tooling base 13 are closed, the whole tooling is sealed and airtight.

[0038] The method for eliminating stress and straightening titanium alloy parts using the above high-temperature side pressure straightening device is as follows:

[0039] 1) Place the sealing tooling base 13 on the hot forming equipment platform, and load the part to be straightened into the sealing working base 13.

[0040] 2) Adjust the height of the hot forming equipment platform so that the rear-end side pressure column 10 passes through the sealing through hole 15 and enters the sealing tooling base 13. Adjust the hydraulic system 12, and adjust the rear-end side pressure column 10 to the position to be straightened through the front-end side pressure column 5, and apply pressure to hold the part. If the surface of the part to be straightened is relatively complex, a simple tooling that fits the surface to be straightened can be pre-made, assembled with the part and then loaded into the sealing tooling base 13, and then adjust the hydraulic system 12 so that the rear-end side pressure column 10 presses against the simple tooling, and the whole surface of the part is straightened by applying force to the simple tooling.

[0041] 3) Assemble the upper cover 14 of the sealing tooling onto the sealing tooling base 13, and connect the vent hole 16 to a vacuum pump or an argon gas cylinder through a ventilation pipe.

[0042] 4) Lower the upper platform of the hot forming equipment onto the upper cover 14 of the sealing tooling and apply a certain pressure to ensure that the sealing tooling is airtight.

[0043] 5) Close the front, rear, and side furnace doors of the hot forming equipment and heat; when heated to the specified temperature, start heat preservation.

[0044] 6) During the heating process, introduce high-purity argon gas or evacuate the air in the sealing tooling to prevent the parts from oxidation.

[0045] 7) After the temperature stabilizes, adjust the hydraulic system 12, and apply the required lateral pressure to the parts in the sealing tooling through the front side pressure column 5 and the rear side pressure column 10 to perform lateral calibration on the parts.

[0046] 8) After the calibration is completed, lower the temperature; after the temperature drops to 100 °C, release the pressure of the hydraulic system 12, retract the rear side pressure column 10, open the furnace door of the hot forming equipment, take out the sealing tooling, and take out the parts.

Claims

1. A high-temperature side-pressing and shape-correcting device for titanium alloy, characterized in that, the device consists of two completely symmetrical and identically configured parts on the left and right and a sealing tooling in the middle. The specific structure on one side includes a bracket (1), a bottom corner fixing device (2), a front-end guide (3), a front-end guide clamping block (4), a front-end side-pressing column (5), a rear-end guide (7), a rear-end guide clamping block (8), a rear-end guide fixing block (9), a rear-end side-pressing column (10), and a hydraulic system (12); the bracket (1) is fixed on the foundation; a bottom corner fixing device (2) is installed at the front end of the bracket (1), and the bottom corner fixing device (2) is installed on the foundation or clamped on the pillar of the hot forming equipment to ensure that the high-temperature side-pressing and shape-correcting device can be stably fixed on the ground; the front-end guide (3) is connected to the top of the bracket (1), and the front-end guide (3) is connected to the front-end guide clamping block (4); the two clamp the front-end side-pressing column (5) to achieve stable movement of the front-end side-pressing column (5); the rear-end guide (7) is connected to the bracket (1) through the rear-end guide fixing block (9); the rear-end guide (7) is connected to the rear-end guide clamping block (8), and the two clamp the rear-end side-pressing column (10) to achieve stable movement of the rear-end side-pressing column (10); the hydraulic system (12) is fixed on the bracket (1), and the hydraulic system (12) is connected to one end of the front-end side-pressing column (5) to deliver pressure to the front-end side-pressing column (5) to achieve the action of the front-end side-pressing column (5) pushing out or retracting; the other end of the front-end side-pressing column (5) is connected to the rear-end side-pressing column (10), and the movement of the front-end side-pressing column (5) drives the movement of the rear-end side-pressing column (10) to achieve the rear-end side-pressing column (10) pushing out and pressing on the part or retracting and relieving pressure; the sealing tooling is placed in the hot forming equipment, and the sealing tooling is a box structure composed of a sealing tooling base (13) and a sealing tooling upper cover (14); wherein, sealing through holes (15) are symmetrically designed on both sides of the sealing tooling base (13), and the rear-end side-pressing column (10) sequentially passes through the hot forming equipment and the sealing through holes (15) and acts on the part placed in the sealing tooling base (13); ventilation holes (16) are provided at the bottom corners of the sealing tooling base (13) for introducing argon or evacuating the air in the sealing tooling to prevent the part from oxidizing.

2. A high-temperature side-pressing and shape-correcting device for titanium alloy according to claim 1, characterized in that, an asbestos heat-insulating board (6) is installed between the front-end side-pressing column (5) and the rear-end side-pressing column (10) to ensure that the front-end side-pressing column (5) and the hydraulic system (12) are isolated from high temperature.

3. A high-temperature side-pressing and shape-correcting device for titanium alloy according to claim 1 or 2, characterized in that, the high-temperature side-pressing and shape-correcting device for titanium alloy further includes a stop block (11), and the stop block (11) is installed on the side furnace door of the hot forming equipment, which functions to insulate heat and facilitate the installation, disassembly, and maintenance of the high-temperature side-pressing and shape-correcting device.

4. A high-temperature side-pressing and shape-correcting device for titanium alloy according to claim 1 or 2, characterized in that, Two rows of sealing strips (17) are provided at the edge of the upper cover (14) of the sealing tooling, which are coupled with the sealing grooves (18) at the edge of the base (13) of the sealing tooling, ensuring that when the upper cover (14) of the sealing tooling is combined with the base (13) of the sealing tooling, the overall sealing of the sealing tooling is airtight.

5. A titanium alloy hot-side press straightening device according to claim 3, characterized in that two rows of sealing strips (17) are provided at the edge of the upper cover (14) of the sealing tooling, which are coupled with the sealing grooves (18) at the edge of the base (13) of the sealing tooling, ensuring that when the upper cover (14) of the sealing tooling is combined with the base (13) of the sealing tooling, the overall sealing of the sealing tooling is airtight.

6. A method for eliminating stress and straightening titanium alloy parts by using the titanium alloy hot-side press straightening device according to any one of claims 1-5, characterized in that the method comprises the following steps: 1) Place the base (13) of the sealing tooling on the platform of the hot forming equipment, and load the parts to be straightened into the base (13) of the sealing tooling; 2) Adjust the height of the platform of the hot forming equipment so that the rear side pressing column (10) passes through the sealing through hole (15) and enters the base (13) of the sealing tooling; adjust the hydraulic system (12), and adjust the rear side pressing column (10) to the position where straightening is required through the front side pressing column (5), and apply pressure to hold the parts; 3) Assemble the upper cover (14) of the sealing tooling onto the base (13) of the sealing tooling, and connect the vent hole (16) to a vacuum pump or an argon gas cylinder; 4) Lower the upper platform of the hot forming equipment onto the upper cover (14) of the sealing tooling and apply pressure to ensure that the sealing tooling is airtight; 5) Close the front, rear, and side furnace doors of the hot forming equipment and heat; when heated to the specified temperature, start heat preservation; 6) During the heating process, introduce high-purity argon gas or evacuate the sealing tooling to prevent the parts from oxidizing; 7) After the temperature is stable, adjust the hydraulic system (12), and apply the required side pressure to the parts in the sealing tooling through the front side pressing column (5) and the rear side pressing column (10) to perform lateral straightening on the parts; 8) After straightening, cool down; after the temperature drops to 100 °C, release the pressure of the hydraulic system (12), retract the rear side pressing column (10), open the furnace door of the hot forming equipment, take out the sealing tooling, and take out the parts.

7. The method according to claim 6, characterized in that in step 2), when the surface of the part to be straightened is relatively complex, a simple tooling that fits the surface to be straightened is pre-made, assembled with the part and then loaded into the base (13) of the sealing tooling, and then the hydraulic system (12) is adjusted to make the rear side pressing column (10) apply pressure to the simple tooling, and the full-surface straightening of the part is performed by applying force to the simple tooling.

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