Titanium alloy frame part bending die and bending method for aircraft

Abstract

The application provides a titanium alloy frame part bending die and a bending method for an aircraft. The titanium alloy frame part bending die for the aircraft comprises a bottom plate, a core plate, extrusion blocks, positioning pin shafts and an upper pressing plate. The core plate is fixedly installed on the central part of the upper surface of the bottom plate. The included angle between the outer peripheral sidewall of the core plate and the upper surface of the bottom plate is less than 90 degrees. A plurality of extrusion blocks are spliced into a ring structure along the circumference of the core plate. The inner peripheral sidewall of the ring structure matches the outer peripheral sidewall of the core plate. The included angle between the outer peripheral sidewall of the ring structure and the upper surface of the bottom plate is greater than 90 degrees. A strip-shaped positioning hole is formed on each extrusion block along the thickness direction of the extrusion block. A plurality of positioning pin shafts are vertically fixedly installed on the upper surface of the bottom plate along the circumference of the bottom plate. The lower surface of the upper pressing plate is provided with an extrusion groove. The inner peripheral sidewall of the extrusion groove matches the outer peripheral sidewall of the ring structure. The application solves the problem that it is difficult to process the required titanium alloy non-standard part for an aircraft by using the existing processing die.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of a titanium alloy part machining die for an aircraft, in particular to a titanium alloy frame part bending die and bending method for an aircraft. BACKGROUND

[0002] An aircraft engine is a highly complex and precise thermal mechanical device, as the heart of an airplane, it is not only the power of the airplane flight, but also an important driving force to promote the development of aviation industry. Every important change in the history of human aviation is inseparable from the technological progress of the aircraft engine. And the engine nacelle, as a cabin to place the aircraft engine, is also one of the most important core components in the aviation propulsion system, and the cost of the engine nacelle accounts for about one fourth of the total engine cost.

[0003] At present, in the manufacturing process of the engine nacelle, a large number of titanium alloy frame non-standard parts are needed to manufacture the outer shell of the engine nacelle. The titanium alloy frame non-standard part is a semicircular ring strip part with a width, the titanium alloy blank extends downward along the outer edge of the ring in the circumferential direction to form a sheet-shaped workpiece with a preset length which needs to be bent, and the lower end of the sheet-shaped workpiece needs to be machined to form a stamping negative angle structure. The casting of the titanium alloy frame non-standard part is mainly stamping forming, and the titanium alloy frame non-standard part has the defects of bending difficulty and difficult shaping, which has high requirements on the machining process and die equipment. The existing machining die is difficult to process the titanium alloy frame non-standard part meeting the requirements, and a special die needs to be used. SUMMARY

[0004] The main purpose of the present application is to provide a titanium alloy frame part bending die and bending method for an aircraft, so as to at least solve the problem that the existing machining die is difficult to process the stamping negative angle of the titanium alloy frame non-standard part.

[0005] In order to achieve the above object, the application provides a titanium alloy frame part bending die for aircraft, which comprises a bottom plate, a core plate, extrusion blocks, positioning pin shafts and an upper pressing plate; the upper surface of the bottom plate is a positioning plane; the core plate is fixedly installed at the central part of the upper surface of the bottom plate; the included angle between the outer peripheral sidewall of the core plate and the upper surface of the bottom plate is less than 90°; the extrusion blocks are multiple, the multiple extrusion blocks are spliced into a ring structure along the circumference of the core plate, the included angle between the inner peripheral sidewall of the ring structure and the upper surface of the bottom plate is greater than 90° and the inner peripheral sidewall of the ring structure and the outer peripheral sidewall of the core plate match each other; the included angle between the outer peripheral sidewall of the ring structure and the upper surface of the bottom plate is greater than 90°; a strip-shaped positioning hole is formed on each extrusion block along the thickness direction of the extrusion block; the positioning pin shafts are multiple, the multiple positioning pin shafts are vertically fixedly installed on the upper surface of the bottom plate along the circumference of the bottom plate; the multiple positioning pin shafts pass through the positioning holes of the multiple extrusion blocks so that the multiple extrusion blocks can be inwardly retracted or outwardly expanded in the horizontal direction towards or away from the center of the ring structure; the lower surface of the upper pressing plate is provided with an extrusion groove, the included angle between the inner peripheral sidewall of the extrusion groove and the groove bottom surface of the extrusion groove is greater than 90° and the inner peripheral sidewall of the extrusion groove and the outer peripheral sidewall of the ring structure match each other; wherein when the upper pressing plate moves downward along the vertical direction towards the bottom plate under the action of external force, the inner peripheral sidewall of the extrusion groove and the outer peripheral sidewall of the ring structure abut against each other to extrude the multiple extrusion blocks, and the multiple extrusion blocks are synchronously retracted in the horizontal direction to bend the sheet-shaped workpiece placed between the outer peripheral sidewall of the core plate and the inner peripheral sidewall of the ring structure by a preset angle.

[0006] Further, the bottom plate and the upper pressing plate are both cuboids.

[0007] Further, the upper surface of the bottom plate is provided with multiple mounting pin shafts, the core plate is provided with multiple mounting holes matched with the mounting pin shafts, and the core plate is fixedly installed on the multiple mounting pin shafts through the multiple mounting holes.

[0008] Further, the upper surface and the lower surface of the core plate are both rounded rectangles, and the circumferential edge of the lower surface of the core plate is inwardly contracted by a preset distance so that the included angle between the outer peripheral sidewall of the core plate and the upper surface of the bottom plate is less than 90°.

[0009] Further, the included angle between the outer peripheral sidewall of the core plate and the upper surface of the bottom plate ranges from 70° to 85°.

[0010] Further, the extrusion blocks are four, the four extrusion blocks include two first extrusion blocks and two second extrusion blocks, the two first extrusion blocks are oppositely arranged along the length direction of the core plate, and the two second extrusion blocks are oppositely arranged along the width direction of the core plate; wherein the side length of the two first extrusion blocks is less than the side length of the two second extrusion blocks so that the ring structure is a rectangular ring structure; the four corners of the rectangular ring structure are all rounded structures.

[0011] Further, the outer edges of the lower surfaces of the two first extrusion blocks are respectively offset outward by a preset distance perpendicular to the width direction of the core plate, so that the included angle between the outer side walls of the first extrusion blocks and the upper surface of the bottom plate ranges from 95° to 110°; the outer edges of the lower surfaces of the two second extrusion blocks are respectively offset outward by a preset distance perpendicular to the length direction of the core plate, so that the included angle between the outer side walls of the second extrusion blocks and the upper surface of the bottom plate ranges from 95° to 110°; the inner edges of the lower surfaces of the two first extrusion blocks are respectively offset inward by a preset distance perpendicular to the width direction of the core plate, so that the included angle between the inner side walls of the first extrusion blocks and the upper surface of the bottom plate ranges from 95° to 110°; the inner edges of the lower surfaces of the two second extrusion blocks are respectively offset inward by a preset distance perpendicular to the length direction of the core plate, so that the included angle between the inner side walls of the second extrusion blocks and the upper surface of the bottom plate ranges from 95° to 110°; wherein the inner side walls of the two first extrusion blocks and the inner side walls of the two second extrusion blocks are spliced to form a ring inner peripheral side wall matched with the outer peripheral side wall of the core plate.

[0012] Further, two positioning holes are formed in each extrusion block, and the length direction of the positioning hole is consistent with the moving direction; eight positioning pin shafts are provided, and the eight positioning pin shafts are divided into four groups and inserted into the positioning holes of the four extrusion blocks one by one.

[0013] Further, the included angle between the inner peripheral side wall of the extrusion groove and the groove bottom surface of the extrusion groove ranges from 95° to 110°, and the ring outer peripheral side wall formed by splicing the outer side walls of the two first extrusion blocks and the outer side walls of the two second extrusion blocks is matched with the inner peripheral side wall of the extrusion groove.

[0014] In another aspect, the application provides a bending method applied to a titanium alloy frame part bending die for an aircraft, the bending method comprising: connecting the core plate and the bottom plate; placing the sheet-shaped workpiece on the upper surface of the core plate; arranging the plurality of extrusion blocks on the plurality of positioning pin shafts through the plurality of positioning holes respectively; splicing the plurality of extrusion blocks into a ring structure along the circumferential direction of the core plate; moving the upper pressing plate downward along the vertical direction towards the bottom plate, and abutting the inner peripheral side wall of the extrusion groove and the outer peripheral side wall of the ring structure to extrude the plurality of extrusion blocks; synchronously inwardly retracting the plurality of extrusion blocks along the horizontal direction to bend the lower end of the sheet-shaped workpiece by a preset angle.

[0015] The titanium alloy frame part bending die for aircraft of the technical scheme of the present application comprises a bottom plate, a core plate, extrusion blocks, positioning pin shafts and an upper pressing plate; the upper surface of the bottom plate is a positioning plane; the core plate is fixedly installed at the central part of the upper surface of the bottom plate; the included angle between the outer peripheral sidewall of the core plate and the upper surface of the bottom plate is less than 90°; the extrusion blocks are multiple, the multiple extrusion blocks are spliced into a ring structure along the circumference of the core plate, the included angle between the inner peripheral sidewall of the ring structure and the upper surface of the bottom plate is greater than 90° and the inner peripheral sidewall of the ring structure and the outer peripheral sidewall of the core plate are matched with each other; the included angle between the outer peripheral sidewall of the ring structure and the upper surface of the bottom plate is greater than 90°; a strip-shaped positioning hole is formed on each extrusion block along the thickness direction of the extrusion block; the positioning pin shafts are multiple, the multiple positioning pin shafts are vertically fixedly installed on the upper surface of the bottom plate along the circumference of the bottom plate; the multiple positioning pin shafts pass through the positioning holes of the multiple extrusion blocks so that the multiple extrusion blocks can be inwardly retracted or outwardly expanded in the horizontal direction towards or away from the center of the ring structure; the lower surface of the upper pressing plate is provided with an extrusion groove, the included angle between the inner peripheral sidewall of the extrusion groove and the groove bottom surface of the extrusion groove is greater than 90° and the inner peripheral sidewall of the extrusion groove and the outer peripheral sidewall of the ring structure are matched with each other; wherein when the upper pressing plate moves downwards along the vertical direction towards the bottom plate under the action of external force, the inner peripheral sidewall of the extrusion groove and the outer peripheral sidewall of the ring structure abut against each other to extrude the multiple extrusion blocks, the multiple extrusion blocks are synchronously retracted in the horizontal direction to bend the sheet-shaped workpiece placed between the outer peripheral sidewall of the core plate and the inner peripheral sidewall of the ring structure by a preset angle. The present application solves the problem that the existing processing die is difficult to process the stamping negative angle of the titanium alloy frame non-standard part. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the description of the present application, explain the present application. The present application is shown by the schematic embodiments of the present application and their descriptions, and does not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 is a die structure schematic view of a titanium alloy frame part bending die for aircraft according to an embodiment of the present application;

[0018] Figure 2 is an upper pressing plate structure schematic view of a titanium alloy frame part bending die for aircraft according to an embodiment of the present application;

[0019] Figure 3 is a side view of an upper pressing plate of a titanium alloy frame part bending die for aircraft according to an embodiment of the present application;

[0020] Figure 4 is an extrusion block structure schematic view of a titanium alloy frame part bending die for aircraft according to an embodiment of the present application.

[0021] In the above drawings, the following reference signs are used:

[0022] 10 bottom plate; 11 mounting pin; 20 core plate; 30 extrusion block; 31 first extrusion block; 32 second extrusion block; 33 positioning hole; 40 positioning pin; 50 upper pressing plate; 51 extrusion groove. DETAILED DESCRIPTION

[0023] It should be noted that the embodiments and features in the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] As Figure 1The titanium alloy frame part bending die for aircraft of the present application comprises a base plate 10, a core plate 20, extrusion blocks 30, positioning pin shafts 40 and an upper pressing plate 50. The upper surface of the base plate 10 is a positioning plane. The core plate 20 is fixedly installed on the central part of the upper surface of the base plate 10. The included angle between the outer peripheral sidewall of the core plate 20 and the upper surface of the base plate 10 is less than 90°. The extrusion blocks 30 are multiple, and the multiple extrusion blocks 30 are spliced into a ring structure along the circumference of the core plate 20. The included angle between the inner peripheral sidewall of the ring structure and the upper surface of the base plate 10 is greater than 90°, and the inner peripheral sidewall of the ring structure and the outer peripheral sidewall of the core plate 20 match each other. The included angle between the outer peripheral sidewall of the ring structure and the upper surface of the base plate 10 is greater than 90°. A strip-shaped positioning hole 33 is formed on each extrusion block 30 along the thickness direction thereof. The positioning pin shafts 40 are multiple, and the multiple positioning pin shafts 40 are vertically fixedly installed on the upper surface of the base plate 10 along the circumference of the base plate 10. The multiple positioning pin shafts 40 pass through the positioning holes 33 of the multiple extrusion blocks 30 so that the multiple extrusion blocks 30 can be inwardly retracted or outwardly expanded in the horizontal direction towards or away from the center of the ring structure. The lower surface of the upper pressing plate 50 is provided with an extrusion groove 51. The included angle between the inner peripheral sidewall of the extrusion groove 51 and the groove bottom surface of the extrusion groove 51 is greater than 90°, and the inner peripheral sidewall of the extrusion groove 51 and the outer peripheral sidewall of the ring structure match each other. When the upper pressing plate 50 moves downward along the vertical direction towards the base plate 10 under the action of external force, the inner peripheral sidewall of the extrusion groove 51 and the outer peripheral sidewall of the ring structure abut against each other to extrude the multiple extrusion blocks 30, and the multiple extrusion blocks 30 are synchronously retracted in the horizontal direction to bend the sheet-shaped workpiece placed between the outer peripheral sidewall of the core plate 20 and the inner peripheral sidewall of the ring structure by a preset angle. In use, the base plate 10 is first fixed on the placement platform of a punching machine, the core plate 20 is connected with the base plate 10, and after the connection of the core plate 20 with the base plate 10 is completed, the sheet-shaped workpiece to be bent is placed along the circumference of the upper surface of the core plate 20. A strip-shaped positioning hole 33 is arranged on each extrusion block 30. The corresponding positioning pin shaft 40 passes through the positioning hole 33, and the multiple extrusion blocks 30 are placed on the circumference of the core plate 20 one by one. The upper pressing plate 50 is hoisted and arranged at the punch end of the punching machine. After the extrusion blocks 30 are placed, the upper pressing plate 50 is pressed downward by the punching machine towards the core plate 20. The upper pressing plate 50 is provided with an extrusion groove 51. The outer peripheral sidewall of the multiple extrusion blocks 30 abut against each other to extrude the multiple extrusion blocks 30 towards the center of the core plate 20. The extrusion blocks 30 extrude the lower end of the sheet-shaped workpiece towards the outer wall of the core plate 20 to completely adhere, so that the lower end of the sheet-shaped workpiece forms a punching negative angle. The upper pressing plate 50 and the base plate 10 are fixedly connected by countersunk head bolts. After cooling for a period of time, the upper pressing plate 50 and the base plate 10 are opened, the multiple extrusion blocks 30 are outwardly expanded away from the circumference of the core plate 20, and the sheet-shaped workpiece with the lower end having formed a punching negative angle is taken out.The present application is convenient to operate, simple in process, and ingenious in die design, and can press stamping negative angles of different angles according to requirements, and solves the problem that the existing processing die is difficult to process stamping negative angles of titanium alloy frame non-standard parts.

[0025] As an optimization scheme of the present application, as shown in Figure 1 The bottom plate 10 and the upper pressing plate 50 are both cuboids. The upper pressing plate 50 is provided with die mounting screw holes for fixing connection of the upper pressing plate 50 and the lower end of the stamping head of the stamping machine through screws, so as to realize up-down reciprocating stamping work. The bottom plate 10 is detachably mounted on the stamping platform of the stamping machine. The edges of the bottom plate 10 and the upper pressing plate 50 are both provided with upper and lower opposite connecting holes in the circumferential direction, which are used for connecting the bottom plate 10 and the upper pressing plate 50 through the sinker bolts after the part forming is completed.

[0026] As an optimization scheme of the present application, as shown in Figure 1 The upper surface of the bottom plate 10 is provided with a plurality of mounting pin shafts 11, and the core plate 20 is provided with a plurality of mounting holes matched with the mounting pin shafts. The core plate 20 is fixedly mounted on the plurality of mounting pin shafts 11 through the plurality of mounting holes. Preferably, the mounting pin shafts 11 are eight, of which four mounting pin shafts 11 are arranged at the middle part of the bottom plate 10 along the width direction of the bottom plate 10 at intervals, and the other four mounting pin shafts 11 are divided into two groups and arranged at the two ends of the upper surface of the bottom plate 10. The core plate 20 is provided with eight mounting holes matched with the mounting pin shafts, and the core plate 20 is fixedly mounted on the eight mounting pin shafts 11 through the eight mounting holes. The core plate 20 and the bottom plate 10 are detachably mounted and connected. When the die needs to be changed, especially when the angle of the outer side wall of the core plate 20 needs to be changed to form negative angles of different angles of the part, the bottom plate 10 and the core plate 20 can be separated, and the core plate 20 is recast separately, so as to save materials and energy.

[0027] As an optimization scheme of the present application, as shown in Figure 1 The upper surface and the lower surface of the core plate 20 are both round rectangular, and the circumferential edge of the lower surface of the core plate 20 is inwardly contracted by a preset distance, so that the included angle between the outer circumferential side wall of the core plate 20 and the upper surface of the bottom plate 10 is less than 90°. The included angle between the outer circumferential side wall of the core plate 20 and the upper surface of the bottom plate 10 ranges from 70° to 85°. The included angle between the outer circumferential side wall of the core plate 20 and the upper surface of the bottom plate 10 can be changed according to different requirements, but when the included angle between the outer circumferential side wall of the core plate 20 and the upper surface of the bottom plate 10 changes, the inner circumferential side wall formed by splicing between the inner side walls of the plurality of extrusion blocks 30 also needs to be changed at the same time.

[0028] As an optimization scheme of the present application, as shown in Figure 1 and Figure 4As shown, the extrusion blocks 30 are four, the four extrusion blocks 30 include two first extrusion blocks 31 and two second extrusion blocks 32, the two first extrusion blocks 31 are oppositely arranged along the length direction of the core plate 20, and the two second extrusion blocks 32 are oppositely arranged along the width direction of the core plate 20; wherein the edge length of the two first extrusion blocks 31 is smaller than the edge length of the two second extrusion blocks 32, so that the annular structure is a rectangular annular structure; and the four corners of the rectangular annular structure are all round corner structures. The extrusion blocks 30 are divided into four, and the four extrusion blocks 30 are divided into two first extrusion blocks 31 and two second extrusion blocks 32, because the upper surface and the lower surface of the core plate 20 are both round corner rectangular structures, the round corner rectangular structure has four edges, but the edges are connected by round corners, in order to prevent the extrusion blocks 30 from causing wrinkles and cracks at the round corners when pressing the negative angle of the stamping, it is necessary to divide the extrusion blocks 30 from the center of the round corner, then the four round corners form the four extrusion blocks 30. The two first extrusion blocks 31 correspond to the two short sides of the core plate 20, the two second extrusion blocks 32 correspond to the two long sides of the core plate 20, and the splicing position of the first extrusion block 31 and the second extrusion block 32 is the center of the round corner.

[0029] As an optimization scheme of the present application, as shown in Figure 1 and Figure 4 As shown, the outer edges of the lower surfaces of the two first extrusion blocks 31 are respectively offset outwardly perpendicular to the width direction of the core plate 20 by a preset distance, so that the included angle between the outer side wall of the first extrusion block 31 and the upper surface of the bottom plate 10 ranges from 95° to 110°; the outer edges of the lower surfaces of the two second extrusion blocks 32 are respectively offset outwardly perpendicular to the length direction of the core plate 20 by a preset distance, so that the included angle between the outer side wall of the second extrusion block 32 and the upper surface of the bottom plate 10 ranges from 95° to 110°; the inner edges of the lower surfaces of the two first extrusion blocks 31 are respectively offset inwardly perpendicular to the width direction of the core plate 20 by a preset distance, so that the included angle between the inner side wall of the first extrusion block 31 and the upper surface of the bottom plate 10 ranges from 95° to 110°; the inner edges of the lower surfaces of the two second extrusion blocks 32 are respectively offset inwardly perpendicular to the length direction of the core plate 20 by a preset distance, so that the included angle between the inner side wall of the second extrusion block 32 and the upper surface of the bottom plate 10 ranges from 95° to 110°; wherein the inner side walls of the two first extrusion blocks 31 and the inner side walls of the two second extrusion blocks 32 are spliced to form an inner circumferential side wall, and the outer circumferential side wall of the core plate 20 is matched with each other, so that the inner circumferential side wall tightly presses the part on the outer circumferential side wall of the core plate 20, and the lower part of the part is formed into a negative angle by flanging. As shown in Figure 2 How Figure 3As shown, the included angle between the inner circumferential wall of the extrusion groove 51 and the groove bottom surface of the extrusion groove 51 ranges from 95° to 110°, and the outer circumferential wall formed by splicing the outer side walls of the two first extrusion blocks 31 and the outer side walls of the two second extrusion blocks 32 matches the inner circumferential wall of the extrusion groove 51. The extrusion blocks 30 as a whole form a rectangular rounded table, so that when the upper pressing plate 50 is pressed down, the extrusion groove 51 matching the outer circumferential wall can inwardly retract the plurality of extrusion blocks 30 in the horizontal direction towards the center of the core plate 20.

[0030] As an optimization scheme of the present application, as shown in Figure 1 and Figure 4 As shown, two strip-shaped positioning holes 33 are formed on each extrusion block 30, and the length direction of the positioning hole 33 is consistent with the moving direction; there are eight positioning pin shafts 40, and the eight positioning pin shafts 40 are divided into four groups and are inserted into the positioning holes 33 of the four extrusion blocks 30 one by one. The upper surface of the bottom plate 10 around the two long edges and the two short edges of the core plate 20 is provided with two positioning pin shafts 40 at a preset interval; each first extrusion block 31 and each second extrusion block 32 are provided with two positioning holes 33, the middle part of the first extrusion block is provided with two positioning holes 33 corresponding to the interval of the two positioning pin shafts 40, and the two positioning holes 33 on the first extrusion block 31 pass through the corresponding two positioning pin shafts 40 to enable the first extrusion block 31 to move in the length direction of the bottom plate 10, and the middle part of the second extrusion block 32 is provided with two positioning holes 33 corresponding to the interval of the two positioning pin shafts 40, and the two positioning holes 33 on the second extrusion block 32 pass through the corresponding two positioning pin shafts 40 to enable the second extrusion block 32 to move in the width direction of the bottom plate 10.

[0031] The edge bending method of the application is applied to a titanium alloy frame part edge bending die for an aircraft, and the edge bending method comprises the following steps: connecting a core plate 20 with a bottom plate 10; placing a sheet-shaped workpiece on the upper surface of the core plate 20; arranging a plurality of extrusion blocks 30 on a plurality of positioning pins 40 through a plurality of positioning holes 33 respectively; splicing the plurality of extrusion blocks 30 into a ring structure along the circumference of the core plate 20; moving an upper pressing plate 50 along the vertical direction downward towards the bottom plate 10, and abutting the inner circumferential side wall of the extrusion groove 51 with the outer circumferential side wall of the ring structure to extrude the plurality of extrusion blocks 30; and synchronously retracting the plurality of extrusion blocks 30 along the horizontal direction to bend the lower end of the sheet-shaped workpiece by a preset angle. The edge bending method specifically comprises the following steps: first, using other molds to pre-press a circular ring strip-shaped part with a width, and the titanium alloy blank extends along the outer edge of the circular ring to form a sheet-shaped workpiece which needs to be bent by a preset length vertically downward, and the application is used in the following way: first, the bottom plate 10 is fixed on the placing platform of the punching machine, the core plate 20 is connected with the bottom plate 10, the upper surface of the bottom plate 10 is provided with eight mounting pins 11, the core plate 20 is provided with eight mounting holes matched with the mounting pins, the core plate 20 is fixedly mounted on the eight mounting pins 11 through the eight mounting holes, and the core plate 20 and the bottom plate 10 are detachably connected. After the core plate 20 is connected with the bottom plate 10, the sheet-shaped workpiece which needs to be bent is placed along the circumference of the upper surface of the core plate 20, and the upper surface of the bottom plate 10 around the two long edges and the two short edges of the core plate 20 is provided with two positioning pins 40 at a preset interval. Each first extrusion block 31 and each second extrusion block 32 are provided with two positioning holes 33, the middle part of the first extrusion block is provided with two positioning holes 33 corresponding to the interval of the two positioning pins 40, the two positioning holes 33 of the first extrusion block pass through the corresponding two positioning pins 40 to enable the first extrusion block 31 to move along the length direction of the bottom plate 10, and the middle part of the second extrusion block 32 is provided with two positioning holes 33 corresponding to the interval of the two positioning pins 40, and the two positioning holes 33 of the second extrusion block pass through the corresponding two positioning pins 40 to enable the second extrusion block 32 to move along the width direction of the bottom plate 10. The corresponding positioning pins 40 pass through the positioning holes 33, and the plurality of extrusion blocks 30 are placed on the circumference of the core plate 20 one by one. The upper pressing plate 50 is arranged on the punch end of the punching machine through hoisting, and when the extrusion blocks 30 are placed, the upper pressing plate 50 is pressed downward by the punching machine towards the core plate 20. The upper pressing plate 50 is provided with an extrusion groove 51, the inner circumferential side wall of the extrusion groove 51 abuts with the outer circumferential side wall of the plurality of extrusion blocks 30 to extrude the plurality of extrusion blocks 30 towards the center of the core plate 20, the extrusion blocks 30 extrude the lower end of the sheet-shaped workpiece towards the outer wall of the core plate 20 to completely adhere, the lower end of the sheet-shaped workpiece forms a punching negative angle, the upper pressing plate 50 and the bottom plate 10 are fixedly connected through the countersunk head bolts, after cooling for a period of time, the upper pressing plate 50 and the bottom plate 10 are opened, the plurality of extrusion blocks 30 are expanded outward along the circumference of the core plate 20, and the sheet-shaped workpiece with the lower end forming the punching negative angle is taken out.The annular lower end of the sheet-shaped workpiece forms a stamping negative angle, and the sheet-shaped workpiece is halved by using a laser cutting tool, namely, the required part is obtained, and the edge bending method is convenient to use and high in working efficiency.

[0032] The edge bending die for the titanium alloy frame part of the aircraft is designed ingeniously, and can press different angle stamping negative angles according to requirements, and solves the problem that the existing machining die is difficult to machine the stamping negative angle of the titanium alloy frame non-standard part. The die can realize two parts from one die, and is high in working efficiency.

[0033] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A bending die for titanium alloy frame parts used in aircraft, characterized in that, include: The base plate (10) has an upper surface that serves as a positioning plane. The core plate (20) is fixedly installed at the center of the upper surface of the base plate (10); the angle between the outer peripheral sidewall of the core plate (20) and the upper surface of the base plate (10) is less than 90°; The extrusion block (30) comprises multiple extrusion blocks (30), which are spliced ​​together in a ring structure along the circumference of the core plate (20). The angle between the inner circumferential sidewall of the ring structure and the upper surface of the base plate (10) is greater than 90°, and the inner circumferential sidewall of the ring structure matches the outer circumferential sidewall of the core plate (20). The angle between the outer circumferential sidewall of the ring structure and the upper surface of the base plate (10) is greater than 90°. Each extrusion block (30) has a strip-shaped positioning hole (33) along its thickness direction. Positioning pins (40), there are multiple positioning pins (40), and the multiple positioning pins (40) are vertically fixedly installed on the upper surface of the base plate (10) along the circumference of the base plate (10); Multiple positioning pins (40) pass through positioning holes (33) of multiple extrusion blocks (30) so that the multiple extrusion blocks (30) can be retracted or expanded in the horizontal direction toward or away from the center of the annular structure; The upper pressure plate (50) has a pressing groove (51) on its lower surface. The angle between the inner peripheral sidewall of the pressing groove (51) and the bottom surface of the pressing groove (51) is greater than 90° and the inner peripheral sidewall of the pressing groove (51) matches the outer peripheral sidewall of the annular structure. When the upper pressure plate (50) moves vertically downward toward the bottom plate (10) under the action of external force, the inner peripheral sidewall of the extrusion groove (51) abuts against the outer peripheral sidewall of the annular structure to extrude multiple extrusion blocks (30), and the multiple extrusion blocks (30) retract synchronously in the horizontal direction to bend the sheet-like workpiece placed between the outer peripheral sidewall of the core plate (20) and the inner peripheral sidewall of the annular structure at a preset angle; The extrusion block (30) consists of four blocks, including two first extrusion blocks (31) and two second extrusion blocks (32). The two first extrusion blocks (31) are arranged opposite each other along the length direction of the core plate (20), and the two second extrusion blocks (32) are arranged opposite each other along the width direction of the core plate (20). The side lengths of the two first extrusion blocks (31) are smaller than the side lengths of the two second extrusion blocks (32) to make the ring structure a rectangular ring structure; the four corners of the rectangular ring structure are rounded; the joint between the first extrusion block (31) and the second extrusion block (32) is the center of the rounded corner.

2. The bending die for titanium alloy frame parts for aircraft according to claim 1, characterized in that, Both the base plate (10) and the upper pressure plate (50) are cuboids.

3. The bending die for titanium alloy frame parts for aircraft according to claim 1, characterized in that, The base plate (10) has a plurality of mounting pins (11) on its upper surface, and the core plate (20) has a plurality of mounting holes that cooperate with the mounting pins. The core plate (20) is fixedly mounted on the plurality of mounting pins (11) through the plurality of mounting holes.

4. The bending die for titanium alloy frame parts for aircraft according to claim 1, characterized in that, The upper and lower surfaces of the core plate (20) are both rounded rectangles. The circumferential edge of the lower surface of the core plate (20) is contracted inward by a predetermined distance so that the angle between the outer peripheral sidewall of the core plate (20) and the upper surface of the base plate (10) is less than 90°.

5. The bending die for titanium alloy frame parts for aircraft according to claim 4, characterized in that, The angle between the outer peripheral sidewall of the core plate (20) and the upper surface of the base plate (10) ranges from 70° to 85°.

6. The bending die for titanium alloy frame parts for aircraft according to claim 5, characterized in that, The outer edges of the lower surfaces of the two first extrusion blocks (31) are offset outward by a predetermined distance perpendicular to the width direction of the core plate (20) so that the angle between the outer wall of the first extrusion block (31) and the upper surface of the base plate (10) is between 95° and 110°; the outer edges of the lower surfaces of the two second extrusion blocks (32) are offset outward by a predetermined distance perpendicular to the length direction of the core plate (20) so that the angle between the outer wall of the second extrusion block (32) and the upper surface of the base plate (10) is between 95° and 110°. The inner edges of the lower surfaces of the two first extrusion blocks (31) are offset inward by a predetermined distance perpendicular to the width direction of the core plate (20) so that the angle between the inner sidewall of the first extrusion block (31) and the upper surface of the base plate (10) is between 95° and 110°; the inner edges of the lower surfaces of the two second extrusion blocks (32) are offset inward by a predetermined distance perpendicular to the length direction of the core plate (20) so that the angle between the inner sidewall of the second extrusion block (32) and the upper surface of the base plate (10) is between 95° and 110°. The inner walls of the two first extrusion blocks (31) and the inner walls of the two second extrusion blocks (32) are spliced ​​together to form an inner circumferential wall that matches the outer circumferential wall of the core plate (20).

7. The bending die for titanium alloy frame parts for aircraft according to claim 6, characterized in that, Each of the extrusion blocks (30) has two strip-shaped positioning holes (33), the length direction of the positioning holes (33) is consistent with its moving direction; there are eight positioning pins (40), the eight positioning pins (40) are divided into four groups and inserted into the positioning holes (33) of the four extrusion blocks (30) one by one.

8. The bending die for titanium alloy frame parts for aircraft according to claim 6, characterized in that, The angle between the inner circumferential sidewall of the extrusion groove (51) and the bottom surface of the extrusion groove (51) ranges from 95° to 110°. The outer circumferential sidewall of the ring formed by splicing the outer sidewalls of the two first extrusion blocks (31) and the outer sidewalls of the two second extrusion blocks (32) matches the inner circumferential sidewall of the extrusion groove (51).

9. A method for bending an edge, characterized in that, The bending method is applied to the bending die for titanium alloy frame parts for aircraft as described in any one of claims 1 to 8, and the bending method includes: Connect the core plate (20) to the base plate (10); The sheet-like workpiece is placed on the upper surface of the core plate (20); Multiple extrusion blocks (30) are respectively set on multiple positioning pins (40) through multiple positioning holes (33) to splice the multiple extrusion blocks (30) into the ring structure along the circumference of the core plate (20); The upper pressure plate (50) is moved vertically downward toward the base plate (10), and the inner peripheral sidewall of the extrusion groove (51) abuts against the outer peripheral sidewall of the annular structure to extrude multiple extrusion blocks (30). The multiple extrusion blocks (30) are simultaneously retracted in the horizontal direction to bend the lower end of the sheet workpiece at a preset angle.

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