Titanium alloy part isothermal thermal forming stepping device and forming method thereof

Abstract

The invention discloses a titanium alloy part isothermal hot forming stepping device and a forming method thereof.The device comprises a first pressing edge and a second pressing edge which are combined and spliced, a male die is arranged at the splicing position of the first pressing edge and the second pressing edge, and through grooves are formed in the first pressing edge and the second pressing edge; a slidable supporting plate is arranged on the lower end face of the first pressing edge, the lower end face of the second pressing edge and the lower end face of the male die, the supporting plate is connected with the die changing trolley, a supporting block is further arranged on the supporting plate, and a positioning pin is arranged on the supporting block. The supporting blocks are arranged in the through grooves in the first pressing edge and the second pressing edge and move in the through grooves in the first pressing edge and the second pressing edge along with movement of the supporting plate. Conventional isothermal thermal forming equipment is modified, a die changing trolley and a supporting plate are additionally arranged on the conventional isothermal thermal forming process equipment, plate positioning is achieved in stepping operation, parts are driven to achieve stepping, and therefore the stepping forming process is achieved, and the stability and the cost can meet the engineering application requirements.

Description

Technical Field

[0001] The invention belongs to the technical field of aerospace sheet metal parts manufacturing, and in particular relates to an isothermal hot forming stepping device for titanium alloy parts and a forming method thereof. Background Art

[0002] Corrugated sheet parts are widely used in the structures of aircraft for collision resistance, impact resistance, heat dissipation, etc. due to their light weight, high strength, beautiful appearance and good stability. Typical structures include Figure 1 shown.

[0003] The existing corrugated plate parts are made of stainless steel. From the perspective of lightweight, it is required to replace the corrugated plate parts with titanium alloy materials. Its typical forming process involves the following multi-step forming process, such as Figure 2 As shown. This process requires the stepping action of the blank. The stepping action of the blank in the above multi-step forming process in room temperature forming is usually completed manually or by a robot; after the corrugated plate parts are replaced with titanium alloy materials, since titanium alloy materials have extremely high yield and tensile strength at room temperature, and extremely poor plasticity, they are difficult to form; at the same time, the forming performance of titanium alloy materials is extremely sensitive to temperature, so isothermal hot forming process is often used for forming.

[0004] A Chinese invention patent with publication number CN118437817A discloses a titanium alloy corrugated plate forming device and method, wherein the titanium alloy corrugated plate forming device includes a bottom mold and a plurality of upper mold pressure strips; the bottom mold is provided with a plurality of grooves, and each of the upper mold pressure strips is provided with a protrusion adapted to the grooves; the bottom mold is used to place a titanium alloy plate, and each of the upper mold pressure strips is used to press the titanium alloy plate into the groove through the protrusion, so that the titanium alloy plate is formed into a titanium alloy corrugated plate; the position on the bottom mold corresponding to the wave crest of the titanium alloy corrugated plate is a theoretical profile, and the position corresponding to the wave trough of the titanium alloy corrugated plate is provided with a first air avoidance groove; the position on the upper mold pressure strip corresponding to the wave trough of the titanium alloy corrugated plate is a theoretical profile, and the position corresponding to the wave crest of the titanium alloy corrugated plate is provided with a second air avoidance groove. This solution adopts a theoretical profile on the convex surface of the transition zone, and a combined forming tooling with an air avoidance area on the concave surface of the transition zone. During forming, the convex surface of the transition zone ensures the accuracy of the theoretical profile, and the air avoidance area of ​​the concave surface alleviates the accumulation of local deformation caused by the meshing of the upper and lower molds in the transition zone during the forming process. The problem of difficult profile forming, poor profile accuracy, and easy cracking of the small R-angle transition zone during the preparation of titanium alloy corrugated plates is solved. However, the device forms a trapezoidal corrugated plate, which is not applicable to the curved corrugated plate proposed in the present invention.

[0005] Therefore, in an isothermal hot forming environment, manual operation is difficult to achieve, and the cost of high-temperature resistant manipulators is extremely high. Therefore, there is an urgent need for an isothermal hot forming step forming solution with stability and cost that can meet the requirements of engineering applications. Summary of the invention

[0006] In order to solve the above problems, the present invention aims to provide a titanium alloy part isothermal hot forming stepping device and a forming method thereof.

[0007] In order to achieve the above-mentioned object, the present invention adopts the following technical scheme: a titanium alloy part isothermal hot forming stepping device, comprising a first pressing edge and a second pressing edge which are combined and spliced, a convex die is arranged at the splicing of the first pressing edge and the second pressing edge, and a through groove is opened on both the first pressing edge and the second pressing edge; The first pressing edge, the second pressing edge and the lower end surface of the punch are provided with a slidable support plate, the support plate is connected to the die changing trolley, a support block is also provided on the support plate, and a positioning pin is provided on the support block; The support block is arranged in the through grooves on the first pressing edge and the second pressing edge, and the support block moves in the through grooves of the first pressing edge and the second pressing edge as the support plate moves.

[0008] Furthermore, the support plate is composed of two parallel flat plates and slides in along the side ends of the first pressing edge and the second pressing edge.

[0009] Furthermore, the two parallel flat plates are each provided with two support blocks, namely a first support block and a second support block, and a positioning pin is provided on the second support block.

[0010] Furthermore, the first pressing edge and the second pressing edge are arc-shaped and maintain the same height, and the positioning pin is higher than the first pressing edge and the second pressing edge.

[0011] Furthermore, the stepping device also includes a lower frame, a working platform is arranged on the upper end surface of the lower frame, the first edge clamp, the second edge clamp and the punch are arranged on the working platform, and a concave mold is arranged on the upper end surface of the first edge clamp, the second edge clamp and the punch.

[0012] Furthermore, a heat-insulating door is arranged at the side end of the stepping device, the upper end of the heat-insulating door is connected to an upper frame, and a sliding block is arranged on the lower end surface of the upper frame.

[0013] A method for isothermal hot forming of titanium alloy parts, wherein a support plate is driven to move by a mold changing trolley in a vertical lifting and horizontal feeding manner, four support blocks on the support plate realize four-point support for the sheet material, the support plate drives the sheet material to move, and then the sheet material completes a complete stepping operation of lifting-stepping-falling.

[0014] Further, the forming method comprises the following steps, Step 1: The first pressing edge and the second pressing edge are lifted synchronously; Step 2: Place the sheet on the first edge clamp and the second edge clamp, and position the sheet through the profile of the second edge clamp and the positioning pin; Step 3: The die moves downward and then closes with the punch, driving the first and second edge clamps to move downward to the bottom, the part is formed, and then the die returns, and the first and second edge clamps are lifted up; Step 4: The support plate is lifted vertically along with the mold changing trolley and drives the first support block and the second support block to support the sheet metal at four points; Step 5: The support plate is fed horizontally with the die-changing trolley and drives the first support block and the second support block to support at four points, and the sheet metal is stepped; Step 6: The support plate vertically descends with the mold changing trolley and drives the first support block and the second support block to support at four points, and the sheet metal falls, and the sheet metal falls on the first edge clamp and the second edge clamp; Step 7: Repeat steps 2 to 6 until all waves are formed.

[0015] Furthermore, the forming process is carried out at a constant temperature.

[0016] Compared with the prior art, the present invention has the following advantages: conventional isothermal hot forming equipment is modified, a mold changing trolley and a support plate are added to the conventional isothermal hot forming process equipment, sheet metal positioning is achieved during the stepping operation and the parts are driven to step, thereby realizing the stepping forming process, and the stability and cost performance meet the needs of engineering applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the specific embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a schematic diagram of typical corrugated plate parts in the present invention; Figure 2 It is a schematic diagram of a typical forming process of a corrugated plate part in the present invention; Figure 3 It is a schematic diagram of the isothermal hot forming stepping device of the titanium alloy part in the present invention; Figure 4 for Figure 3 A magnified view of point B; Figure 5 It is a partial schematic diagram of the isothermal hot forming stepping device of the titanium alloy part in the present invention; Figure 5-1 for Figure 5 A magnified image of point a; Figure 5-2 for Figure 5 The enlarged view of point b; Figure 6It is a schematic diagram of the isothermal hot forming step forming process of the titanium alloy part in the present invention; In the figure, 1-first edge clamp; 2-punch; 3-second edge clamp; 4-first support block; 5-locating pin; 6-second support block; 7-support plate; 8-mold changing trolley; 9-die; 10-upper frame; 11-slider; 12-insulation door; 13-working platform; 14-lower frame; 15-sheet material; A-support block. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various modifications, substitutions and changes made according to the common technical knowledge and customary means in the field are included in the scope of the present invention.

[0020] Reference Figure 3-Figure 5 A stepping device for isothermal hot forming of titanium alloy parts is modified on the basis of conventional isothermal hot forming equipment so that its stability and cost can meet the requirements of engineering applications. The main modification content is: to increase the support plate 7 to slide in and out of the equipment. When this function is used, the support plate 7 and the mold changing trolley 8 slide. When not in use, the support plate is stored inside and does not cause any impact on the overall device.

[0021] The forming stepping device includes a mold changing trolley 8, an upper frame 10, a slider 11, a heat-insulating door 12, a working platform 13, and a lower frame 14, which constitute an isothermal hot forming device. The equipment structure is composed of conventional equipment for isothermal hot forming process; its structure includes a first clamp 1, a punch 2, a second clamp 3, a first support block 4, a positioning pin 5, a second support block 6, a support plate 7, and a die 9, which together constitute a stepping forming device.

[0022] The device includes a first edge clamp 1 and a second edge clamp 3 which are combined and spliced. The first edge clamp 1 and the second edge clamp 3 are arc-shaped and maintain the same height. A punch 2 is arranged at the joint of the first edge clamp 1 and the second edge clamp 3, and through grooves are opened on the first edge clamp 1 and the second edge clamp 3; a support block A is arranged in the through grooves on the first edge clamp 1 and the second edge clamp 3, and a positioning pin 5 is arranged on the support block A. The positioning pin 5 is higher than the first edge clamp 1 and the second edge clamp 3. A slidable support plate 7 is arranged on the lower end surfaces of the first edge clamp 1, the second edge clamp 3 and the punch 2. The support plate 7 is connected to a mold changing trolley 8. The support block A moves in the through grooves of the first edge clamp 1 and the second edge clamp 3 as the support plate 7 moves.

[0023] The support plate 7 is composed of two parallel flat plates and slides in along the side ends of the first pressing edge 1 and the second pressing edge 3. Figure 5-1And 5-2, two support blocks A are arranged on the upper end surfaces of the two parallel flat plates according to the spacing, the two support blocks away from the end of the mold changing trolley 8 are the first support blocks 4, the two support blocks close to the end of the mold changing trolley 8 are the second support blocks 6, and the second support blocks 6 are provided with positioning pins 5. The two first support blocks 4 are on the same horizontal line, and the two second support blocks 6 are also on the same horizontal line, that is, the four support blocks A are distributed in a rectangular shape, and support blocks A are arranged at four points of the parallel support plate 7 to ensure stable support, and the contact surface between the support block A and the sheet material is designed according to the shape of the sheet material.

[0024] The stepping device also includes a lower frame 14, a working platform 13 is arranged on the upper end surface of the lower frame 14, the first pressing edge 1, the second pressing edge 3 and the punch 2 are arranged on the working platform 13, and a concave mold 9 is arranged on the upper end surfaces of the first pressing edge 1, the second pressing edge 3 and the punch 2. A heat preservation door 12 is arranged at the side end of the stepping device, the upper end of the heat preservation door 12 is connected to the upper frame 10, and a slider 11 is arranged on the lower end surface of the upper frame 10.

[0025] Reference Figure 6 The isothermal hot forming method of titanium alloy parts drives the support plate 7 to move by the movement of the mold changing trolley 8 in the vertical direction and the horizontal direction. The four support blocks A on the support plate 7 realize the four-point support of the sheet material 15. The support plate 7 drives the sheet material 15 to move, and then the sheet material 15 completes the complete stepping operation of lifting-stepping-falling.

[0026] The following steps are included: Step 1: The first pressing edge 1 and the second pressing edge 3 are lifted synchronously; Step 2: placing the sheet 15 on the first edge clamp 1 and the second edge clamp 3, and positioning the sheet 15 by the profile of the second edge clamp 3 and the positioning pin 5; Step 3: The die 9 moves downward and then closes with the punch 2, and then continues to move downward, driving the first edge clamp 1 and the second edge clamp 3 to move downward to the bottom, the part is formed, and then the die 9 returns, and the first edge clamp 1 and the second edge clamp 3 are lifted up; Step 4: The support plate 7 is lifted vertically along with the mold changing trolley 8 and drives the first support block 4 and the second support block 6 to support the sheet material 15 at four points; Step 5: The support plate 7 is fed horizontally with the die-changing trolley 8 and drives the first support block 4 and the second support block 6 to support at four points, and the sheet material 15 completes the stepping; Step 6: The support plate 7 is vertically lowered along with the mold changing trolley 8 and drives the first support block 4 and the second support block to support at four points, and the sheet material 15 falls, and the sheet material 15 falls on the first edge clamp 1 and the second edge clamp 3; Step 7: Repeat steps 2 to 6 until all waves are formed.

[0027] The above is a detailed introduction to a titanium alloy part isothermal hot forming stepping device and a forming method thereof provided by the present invention. This article uses specific examples to illustrate the structure and working principle of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A stepping device for isothermal hot forming of titanium alloy parts, characterized in that: It comprises a first pressing edge (1) and a second pressing edge (3) which are combined and spliced, a convex mold (2) is arranged at the splicing position of the first pressing edge (1) and the second pressing edge (3), and a through groove is opened on the first pressing edge (1) and the second pressing edge (3); The lower end surfaces of the first pressing edge (1), the second pressing edge (3) and the punch (2) are provided with a slidable support plate (7), the support plate (7) is connected to the die-changing trolley (8), a support block (A) is also provided on the support plate (7), and a positioning pin (5) is provided on the support block (A); The support block (A) is arranged in through grooves on the first pressing edge (1) and the second pressing edge (3), and the support block (A) moves in the through grooves of the first pressing edge (1) and the second pressing edge (3) as the support plate (7) moves.

2. The isothermal hot forming stepping device for titanium alloy parts according to claim 1 is characterized in that: The support plate (7) is composed of two parallel flat plates and slides in along the side ends of the first pressing edge (1) and the second pressing edge (3).

3. The isothermal hot forming stepping device for titanium alloy parts according to claim 2, characterized in that: Two support blocks (A) are arranged on the two parallel flat plates, namely a first support block (4) and a second support block (6), and a positioning pin (5) is arranged on the second support block (6).

4. The isothermal hot forming stepping device for titanium alloy parts according to claim 1, characterized in that: The first pressing edge (1) and the second pressing edge (3) are arc-shaped and maintain the same height, and the positioning pin (5) is higher than the first pressing edge (1) and the second pressing edge (3).

5. The isothermal hot forming stepping device for titanium alloy parts according to claim 1, characterized in that: The stepping device also includes a lower frame (14), a working platform (13) is arranged on the upper end surface of the lower frame (14), a first edge clamp (1), a second edge clamp (3) and a punch (2) are arranged on the working platform (13), and a concave mold (9) is arranged on the upper end surfaces of the first edge clamp (1), the second edge clamp (3) and the punch (2).

6. The isothermal hot forming stepping device for titanium alloy parts according to claim 1, characterized in that: A heat-insulating door (12) is provided at the side end of the stepping device, the upper end of the heat-insulating door (12) is connected to the upper frame (10), and a sliding block (11) is provided on the lower end surface of the upper frame (10).

7. An isothermal hot forming method using the isothermal hot forming stepping device for titanium alloy parts according to any one of claims 1 to 6, characterized in that: The support plate (7) is driven to move by the mold changing trolley (8) in the vertical lifting and horizontal feeding mode, and the four support blocks (A) on the support plate (7) realize four-point support for the sheet material (15). The support plate (7) drives the sheet material (15) to move, and then the sheet material (15) completes the complete stepping operation of lifting-stepping-falling.

8. The isothermal hot forming method according to claim 7, characterized in that: The following steps are included: Step 1: The first pressing edge (1) and the second pressing edge (3) are lifted synchronously; Step 2: placing the sheet material (15) on the first edge clamp (1) and the second edge clamp (3), and positioning the sheet material (15) by means of the profile of the second edge clamp (3) and the positioning pin (5); Step 3: The female die (9) moves downward and closes with the male die (2), and then continues to move downward, driving the first edge holder (1) and the second edge holder (3) to move downward to the bottom, and the part is formed. Then the female die (9) returns, and the first edge holder (1) and the second edge holder (3) are lifted up. Step 4: The support plate (7) is lifted vertically along with the mold changing trolley (8) and drives the first support block (4) and the second support block (6) to support the sheet material (15) at four points; Step 5: The support plate (7) is fed horizontally along with the mold changing trolley (8) and drives the first support block (4) and the second support block (6) to support at four points, and the sheet material (15) completes the stepping; Step 6: The support plate (7) vertically descends along with the mold changing trolley (8) and drives the first support block (4) and the second support block to support at four points, and the sheet material (15) falls, and the sheet material (15) falls on the first edge clamp (1) and the second edge clamp (3); Step 7: Repeat steps 2 to 6 until all waves are formed.

9. The isothermal hot forming method according to claim 8, characterized in that: The forming process is carried out at a constant temperature.

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