Arc-shaped bending sheet forming die and forming method for aviation

Abstract

The present invention provides a forming mold and forming method for an arc-shaped bent piece for aviation. The forming mold for an arc-shaped bent piece for aviation comprises a lower template, a core plate, a pressing plate, a pushing block and an upper template; the lower template has a positioning plane and a molding groove having a first positioning surface and a first pushing surface; the core plate has a second positioning surface and a second pushing surface having a pushing slope surface; the pushing block has a pushing surface and an extrusion surface; the upper template has a molding protrusion; after the core plate is pressed into the molding groove, the pushing block is pressed into between the pushing slope surface and the first pushing surface, pushing the core plate forward to extrude the sheet blank between the second positioning surface and the first positioning surface into an arc-shaped piece; the pressing plate presses the upper edge of the arc-shaped piece onto the positioning plane, and the molding protrusion is pressed into the molding groove to fold the arc-shaped sheet blank into an arc-shaped bent piece, thereby solving the problem that titanium alloy processing molds and processes in the prior art are difficult to process titanium alloy arc-shaped bent pieces that meet the requirements.

Description

Technical Field

[0001] The present invention relates to the field of titanium alloy molding, and in particular to a molding die and a molding method for arc-shaped bent sheets for aviation. Background Art

[0002] In today's aircraft manufacturing industry, many important components of large aircraft are made of special alloys, among which titanium alloy is the most widely used. Due to its high strength, high temperature resistance, corrosion resistance and light weight, it meets the material requirements of aviation vehicles. However, due to these characteristics, titanium alloy is more difficult to shape than ordinary metals; especially titanium alloy arc-shaped bending sheets, which need to be bent into an arc and then folded back, requiring complex processes and precise equipment. Existing processing molds and common processes make it difficult to produce corresponding titanium alloy arc-shaped bending sheets. Summary of the Invention

[0003] The main purpose of the present invention is to provide a forming die and forming method for arc-shaped bent sheets for aviation, so as to at least solve the problem that titanium alloy processing dies and processes in the prior art are difficult to process titanium alloy arc-shaped bent sheets that meet the requirements.

[0004] In order to achieve the above-mentioned purpose, the first aspect of the present invention provides an arc-shaped bending sheet forming mold for aviation, comprising a lower template, a core plate, a pressing plate, a pushing block and an upper template; the upper surface of the lower template is provided with a molding groove and a positioning plane, the first side wall of the molding groove forms a first positioning surface, the second side wall of the molding groove forms a first pushing surface, the first positioning surface and the first pushing surface are opposite to each other along the plate surface direction of the lower template; the core plate is detachably installed in the molding groove of the lower template, and the shape of the core plate matches the shape of the molding groove; the first side wall of the core plate forms a second positioning surface, the second side wall of the core plate forms a second pushing surface, the second positioning surface and the second pushing surface are opposite to each other along the plate surface direction of the core plate; the second pushing surface is provided with a pushing slope; the shape of the pressing plate matches the positioning plane; the first side wall of the pushing block forms a pushing surface, and the second side wall of the pushing block forms an extrusion surface The pressing surface; the pushing surface and the extrusion surface are opposite to each other along the plate surface direction of the pushing block, the pushing surface matches the first pushing surface, and the shape of the extrusion surface matches the pushing slope surface; a molding protrusion is provided on the lower surface of the upper template, and the shape of the molding protrusion matches the molding groove; wherein, the core plate is pressed into the molding groove along the vertical direction; the pushing block is pressed between the pushing slope surface and the first pushing surface along the vertical direction to push the core plate toward the first positioning surface to extrude the sheet blank placed between the second positioning surface and the first positioning surface into an arc-shaped sheet; the lower edge of the arc sheet abuts the second positioning surface and the first positioning surface, and the upper edge of the arc sheet is bent toward the positioning plane at a preset angle, and the pressing plate moves downward in the vertical direction to press the upper edge of the arc sheet on the positioning plane, and the molding protrusion of the upper template is pressed into the molding groove along the vertical direction to fold the arc-shaped sheet blank into an arc-bent sheet.

[0005] Furthermore, the first positioning surface and the second positioning surface are both arc-shaped surfaces.

[0006] Furthermore, the angle between the first positioning surface and the positioning plane is less than 90°, and the angle between the first pushing surface and the bottom surface of the molding groove is greater than 90°; the angle between the second positioning surface and the upper surface of the core plate is greater than 90°, the angle between the second pushing surface and the upper surface of the core plate is less than 90°, and the angle between the pushing slope surface and the upper surface of the core plate 20 is greater than 90°.

[0007] Furthermore, the angle between the pushing surface on the pushing block and the upper surface of the pushing block is less than 90°, and the angle between the extrusion surface and the upper surface of the pushing block is less than 90°.

[0008] Furthermore, after the core plate is pressed into the molding groove, the pushing block is pressed between the pushing slope and the first pushing surface, and the extrusion surface abuts against the pushing slope to push the pushing slope forward; the pushing surface abuts against the first pushing surface to push the first pushing surface to move the pushing block and the core plate forward.

[0009] Furthermore, the heights of the core plate and the pushing block are both smaller than the depth of the molding groove.

[0010] Furthermore, the height of the pressing plate is smaller than the height of the molding protrusion.

[0011] The second aspect of the present invention provides a forming method, which is applied to an arc-shaped bending sheet forming mold for aviation, and the forming method comprises: heating a sheet blank and manually shaping the sheet blank to make it arc-shaped; placing the manually shaped arc-shaped sheet blank into a forming groove of a lower template, so that one side of the sheet blank abuts against the first positioning surface of the forming groove; placing a core plate into the forming groove in a vertical direction, and abutting against the second positioning surface of the core plate against the other side of the sheet blank; pressing a pushing block in a vertical direction between the first pushing surface of the forming groove and the pushing slope of the core plate, and squeezing the pushing block downward in a vertical direction, and the pushing block The pushing surface pushes against the first pushing surface, and the extrusion surface of the pushing block pushes against the pushing slope to move the core plate toward the first positioning surface, and the two side surfaces of the sheet blank are squeezed and shaped into an arc-shaped sheet by the first positioning surface and the second positioning surface; the upper edge of the arc sheet is heated and then bent manually, and the upper edge of the arc sheet is bent toward the positioning plane at a preset angle, and then the pressing plate is pressed downward in the direction toward the positioning plane so that the upper edge of the arc sheet abuts against the positioning plane; the upper template is pressed down in the vertical direction so that the molding protrusion of the upper template is pressed into the molding groove in the vertical direction to fold the arc-shaped sheet blank into an arc-bent sheet.

[0012] The arc-shaped bending sheet forming mold for aviation using the technical solution of the present invention comprises a lower template, a core plate, a pressing plate, a pushing block and an upper template; the upper surface of the lower template is provided with a molding groove and a positioning plane, the first side wall of the molding groove forms a first positioning surface, the second side wall of the molding groove forms a first pushing surface, and the first positioning surface and the first pushing surface are opposite to each other along the plate surface direction of the lower template; the core plate is detachably installed in the molding groove of the lower template, and the shape of the core plate matches the shape of the molding groove; the first side wall of the core plate forms a second positioning surface, the second side wall of the core plate forms a second pushing surface, and the second positioning surface and the second pushing surface are opposite to each other along the plate surface direction of the core plate; the second pushing surface is provided with a pushing slope; the shape of the pressing plate matches the positioning plane; the first side wall of the pushing block forms a pushing surface, and the second side wall of the pushing block forms an extrusion surface; the pushing surface and the extrusion surface are opposite to each other along the plate surface direction of the pushing block, and the pushing surface is opposite to the first The upper template is provided with a molding protrusion on the lower surface, and the molding protrusion is matched with the molding groove; the core plate is pressed into the molding groove in the vertical direction; the pushing block is pressed between the pushing slope and the first pushing surface in the vertical direction to push the core plate toward the first positioning surface to extrude the sheet blank placed between the second positioning surface and the first positioning surface into an arc-shaped sheet; the lower edge of the arc sheet abuts the second positioning surface and the first positioning surface, and the upper edge of the arc sheet is bent toward the positioning plane at a preset angle, and the pressing plate moves downward in the vertical direction to press the upper edge of the arc sheet on the positioning plane, and the molding protrusion of the upper template is pressed into the molding groove in the vertical direction to fold the arc sheet blank into an arc-shaped bent sheet, which solves the problem that titanium alloy processing molds and processes in the existing technology are difficult to process titanium alloy arc-shaped bent sheets that meet the requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0014] Figure 1 This is a schematic diagram of the main structure of an optional arc-shaped bending sheet forming die for aviation according to an embodiment of the present invention;

[0015] Figure 2 This is a schematic diagram of the upper template structure of an optional arc-shaped bending sheet forming die for aviation according to an embodiment of the present invention;

[0016] Figure 3 This is a schematic diagram of the structure of a push block of an arc-shaped bending sheet forming die for aviation, which can be selected according to an embodiment of the present invention;

[0017] The above drawings include the following reference numerals:

[0018] 10. Lower template; 11. Molding groove; 12. Positioning plane; 13. First positioning surface; 14. First pushing surface; 20. Core plate; 21. Second positioning surface; 22. Second pushing surface; 221. Pushing slope; 30. Pressing plate; 40. Pushing block; 41. Pushing surface; 42. Extrusion surface; 50. Upper template; 51. Molding protrusion. DETAILED DESCRIPTION

[0019] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0020] According to the embodiment of the present invention, the arc-shaped bending piece forming die for aviation, such as Figure 1 and Figure 2 As shown, it includes a lower template 10, a core plate 20, a pressure plate 30, a pushing block 40 and an upper template 50; the upper surface of the lower template 10 is provided with a molding groove 11 and a positioning plane 12, the first side wall of the molding groove 11 forms a first positioning surface 13, the second side wall of the molding groove 11 forms a first pushing surface 14, the first positioning surface 13 and the first pushing surface 14 are opposite to each other along the plate surface direction of the lower template 10; the core plate 20 is detachably installed in the molding groove 11 of the lower template 10, and the shape of the core plate 20 is consistent with the shape of the molding groove 11 Matching; the first side wall of the core plate 20 forms a second positioning surface 21, and the second side wall of the core plate 20 forms a second pushing surface 22, and the second positioning surface 21 and the second pushing surface 22 are opposite to each other along the plate surface direction of the core plate 20; the second pushing surface 22 is provided with a pushing slope 221; the shape of the pressing plate 30 matches the positioning plane 12; the first side wall of the pushing block 40 forms a pushing surface 41, and the second side wall of the pushing block 40 forms an extrusion surface 42; the pushing surface 41 and the extrusion surface 42 are opposite to each other along the plate surface direction of the pushing block 40, and the pushing surface 41 is opposite to the first pushing surface The extrusion surface 14 matches, and the shape of the extrusion surface 42 matches the pushing slope 221; the lower surface of the upper template 50 is provided with a molding protrusion 51, and the shape of the molding protrusion 51 matches the molding groove 11; wherein, the core plate 20 is pressed into the molding groove 11 along the vertical direction; the pushing block 40 is pressed into between the pushing slope 221 and the first pushing surface 14 along the vertical direction, pushing the core plate 20 toward the first positioning surface 13 to extrude and shape the sheet blank placed between the second positioning surface 21 and the first positioning surface 13 into an arc-shaped sheet; the arc-shaped sheet The lower edge abuts the second positioning surface 21 and the first positioning surface 13, the upper edge of the arc-shaped sheet is higher than the molding groove 11 and the core plate 20, and is bent toward the positioning plane 12 at a preset angle, and the pressing plate 30 moves downward in the vertical direction to press the upper edge of the arc-shaped sheet onto the positioning plane 12, and the molding protrusion 51 of the upper template 50 is pressed into the molding groove 11 in the vertical direction to fold the arc-shaped sheet blank into an arc-shaped bent sheet, which solves the problem that the titanium alloy processing molds and processes in the existing technology are difficult to process titanium alloy arc-shaped bent sheets that meet the requirements.

[0021] When implementing it specifically, Figure 1 As shown, the first positioning surface 13 and the second positioning surface 21 are both arc-shaped surfaces. Since the main shape of the arc-shaped bending sheet is an arc, the two arc-shaped first positioning surfaces 13 and the second positioning surfaces 21 are surfaces with the same curvature. Only one extrusion is required to process the sheet blank into an arc shape, which greatly improves the working efficiency of the forming mold.

[0022] When implementing it specifically, Figure 1 As shown, the angle between the first positioning surface 13 and the positioning plane 12 is less than 90°, and the angle between the first pushing surface 14 and the bottom surface of the molding groove 11 is greater than 90°; the angle between the second positioning surface 21 and the upper surface of the core plate 20 is greater than 90°, the angle between the second pushing surface 22 and the upper surface of the core plate 20 is less than 90°, and the angle between the pushing slope 221 and the upper surface of the core plate 20 is greater than 90°; the angle between the first positioning surface 13 and the positioning plane 12 is a rounded structure, which can avoid breakage of the arc-shaped sheet when it is extruded and bent. At the same time, the angle between the first positioning surface 13 and the positioning plane 12 and the angle between the second positioning surface 21 and the upper surface of the core plate 20 are corresponding, so that the first positioning surface 13 and the second positioning surface 21 can be completely fitted together, thereby improving the extrusion effect of the sheet blank and improving the molding efficiency.

[0023] When implementing it specifically, Figure 2 As shown, the angle between the pushing surface 41 on the pushing block 40 and the upper surface of the pushing block 40 is less than 90 degrees, and the angle between the extrusion surface 42 and the upper surface of the pushing block 40 is less than 90 degrees. The angle between the pushing surface 41 and the upper surface of the pushing block 40 corresponds to the angle between the first pushing surface 14 and the bottom surface of the molding groove 11; the angle between the extrusion surface 42 and the upper surface of the pushing block 40 corresponds to the angle between the pushing slope 221 and the upper surface of the core plate 20. When the pushing block 40 is pressed down, the pushing surface 41 and the first pushing surface 14, and the extrusion surface 42 and the pushing slope 221 can be stably abutted and tightly adhered. This design enhances the linkage of the molding mold and makes the mutual cooperation of the various parts of the molding mold in the molding process more stable.

[0024] When implementing it specifically, Figure 1 As shown, after the core plate 20 is pressed into the molding groove 11, the pushing block 40 is pressed between the pushing slope 221 and the first pushing surface 14, and the extrusion surface 42 abuts against the pushing slope 221 to push the pushing slope 221 forward; the pushing surface 41 abuts against the first pushing surface 14 to push the first pushing surface 14 to move the pushing block 40 and the core plate 20 forward; because the angles of each surface correspond to each other, the pushing surface 41 can be tightly attached to the first pushing surface 14 and slide on the first pushing surface 14, and the extrusion surface 42 can be tightly attached to the pushing slope 221 and slide on the pushing slope 221, thereby increasing the pushing force on the core plate 20 and reducing the error rate of the molding mold.

[0025] When implementing it specifically, Figure 1 As shown, the heights of the core plate 20 and the pushing block 40 are both smaller than the depth of the molding groove 11, and the difference between the heights of the core plate 20 and the pushing block 40 and the depth of the molding groove 11 can just accommodate a part of the molding protrusion 51, and the height of the other parts of the molding protrusion 51 is just the same as the height of the pressing plate 30. When the molding protrusion 51 abuts against the core plate 20, the upper template 50 also abuts against the pressing plate 30 to generate a downward pressure on the pressing plate 30.

[0026] When implementing it specifically, Figure 1 and Figure 2 As shown, the height of the pressing plate 30 is less than the height of the molding protrusion 51; assuming that the height of the pressing plate 30 is higher than the molding protrusion 51, when the upper template 50 is pressed down, when the upper template 50 abuts against the pressing plate 30, the lower surface of the molding protrusion 51 cannot abut against the upper surface of the core plate 20, thereby losing the downward pressure on the core plate 20 and the pushing block 40, which can easily cause the core plate 20 to shift and cause extrusion deviation, affecting the molding process; therefore, the height of the pressing plate 30 is less than the height of the molding protrusion 51 to avoid this problem.

[0027] The forming method according to the embodiment of the present invention is applied to the arc-shaped bending sheet forming mold for aviation, and the forming method includes: first, heating the sheet blank and then manually shaping the sheet blank into an arc shape; placing the manually shaped arc-shaped sheet blank into the molding groove 11 of the lower template 10, so that one side of the sheet blank abuts the first positioning surface 13 of the molding groove 11; placing the core plate 20 into the molding groove 11 in the vertical direction, and making the second positioning surface 21 of the core plate 20 abut against the other side of the sheet blank; pressing the pushing block 40 between the first pushing surface 14 of the molding groove 11 and the pushing slope 221 of the core plate 20 in the vertical direction, and the pushing block 40 is squeezed downward in the vertical direction, and the pushing surface 41 of the pushing block 40 pushes toward the first pushing surface 14, and the extrusion surface 42 of the pushing block 40 pushes toward the pushing slope 221, so that the core plate 20 moves toward the first positioning surface 13, and the two sides of the sheet blank The side surface is squeezed and shaped into an arc-shaped sheet by the first positioning surface 13 and the second positioning surface 21; the upper edge of the arc-shaped sheet is heated and then bent manually, and the upper edge of the arc-shaped sheet is bent toward the positioning plane 12 at a preset angle, and then the pressing plate 30 is pressed downward in the direction toward the positioning plane 12 so that the upper edge of the arc-shaped sheet abuts the positioning plane 12; the upper template 50 is pressed down in the vertical direction so that the molding protrusion 51 of the upper template 50 is pressed into the molding groove 11 in the vertical direction to fold the arc-shaped sheet blank into an arc-shaped bent sheet; this forming method is only achieved through manual operation when the sheet blank is slightly bent and when the upper edge of the arc sheet is slightly bent. The other processes are all through the forming mold, with less manual intervention, and are mainly shaped by the structure inside the forming mold, which largely avoids the aviation arc-shaped bent sheet forming mold using this forming method from making mistakes due to problems in the molding process caused by manual intervention.

[0028] The working principle of the present invention is explained from the perspective of actual use cases. First, the lower template 10 is placed on the hydraulic table. Then, the sheet blank is heated and hammered manually to make it slightly curved. Then, it is placed on its side in the molding groove 11, with one side attached to the first positioning surface 13. Then, the core plate 20 is placed in the molding groove 11, and the second positioning surface 21 of the core plate 20 is close to the other side of the sheet blank. Then, a hydraulic press is used to squeeze the pushing block 40 into the gap formed between the pushing slope 221 of the core plate 20 and the first pushing surface 14 of the molding groove 11. After the pushing block 40 enters, the pushing surface 41 on the pushing block 40 will slide on the first pushing surface 14 to generate a pushing force, and the extrusion surface 42 on the pushing block 40 will push against the pushing slope 221 to generate a pushing force. The second positioning surface 21 will move closer to the first positioning surface 13, thereby squeezing the sheet blank and shaping it into an arc-shaped sheet; the upper edge of the arc-shaped sheet is higher than the core plate 20 and the shaping groove 11, and this part will abut against the positioning plane 12 of the lower template 10 after being heated, hammered and bent; then the pressing plate 30 is pressed on the upper edge of the arc-shaped sheet, and the molding protrusion 51 of the upper template 50 is pressed into the molding groove 11 by a hydraulic press, so that the upper template 50 will abut against the pressing plate 30 and generate a downward squeezing force, thereby squeezing and shaping the arc-shaped sheet with the positioning plane 12 to form an arc-shaped bent sheet.

[0029] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A arc-shaped bending sheet forming die for aviation, characterized in that: include: A lower template (10), wherein the upper surface of the lower template (10) is provided with a molding groove (11) and a positioning plane (12), the first side wall of the molding groove (11) forms a first positioning surface (13), the second side wall of the molding groove (11) forms a first pushing surface (14), and the first positioning surface (13) and the first pushing surface (14) are opposite to each other along the plate surface direction of the lower template (10); A core plate (20), wherein the core plate (20) is detachably mounted in the molding groove (11) of the lower template (10), and the outer shape of the core plate (20) matches the outer shape of the molding groove (11); a first side wall of the core plate (20) forms a second positioning surface (21), and a second side wall of the core plate (20) forms a second pushing surface (22), and the second positioning surface (21) and the second pushing surface (22) are opposite to each other along the plate surface direction of the core plate (20); and the second pushing surface (22) is provided with a pushing slope (221); A pressing plate (30), wherein the shape of the pressing plate (30) matches the positioning plane (12); A pushing block (40), wherein a first side wall of the pushing block (40) forms a pushing surface (41), and a second side wall of the pushing block (40) forms an extrusion surface (42); the pushing surface (41) and the extrusion surface (42) are opposite to each other along the plate surface direction of the pushing block (40), the pushing surface (41) matches the first pushing surface (14), and the shape of the extrusion surface (42) matches the pushing slope (221); An upper template (50), wherein a molding protrusion (51) is provided on the lower surface of the upper template (50), and the shape of the molding protrusion (51) matches the molding groove (11); The core plate (20) is pressed into the molding groove (11) in the vertical direction; the pushing block (40) is pressed between the pushing slope (221) and the first pushing surface (14) in the vertical direction to push the core plate (20) toward the first positioning surface (13) to extrude and mold the sheet blank placed between the second positioning surface (21) and the first positioning surface (13) into an arc-shaped sheet; the lower edge of the arc-shaped sheet abuts the second positioning surface (21) and the first positioning surface (13), the upper edge of the arc-shaped sheet is bent at a preset angle toward the positioning plane (12), the pressing plate (30) moves downward in the vertical direction to press the upper edge of the arc-shaped sheet onto the positioning plane (12), and the molding protrusion (51) of the upper template (50) is pressed into the molding groove (11) in the vertical direction to fold the arc-shaped sheet blank into an arc-shaped bent sheet.

2. The arc-shaped bending piece forming die for aviation according to claim 1, characterized in that: The first positioning surface (13) and the second positioning surface (21) are both arc-shaped surfaces.

3. The arc-shaped bending piece forming die for aviation according to claim 2, characterized in that: The angle between the first positioning surface (13) and the positioning plane (12) is less than 90°, and the angle between the first pushing surface (14) and the bottom surface of the molding groove (11) is greater than 90°; the angle between the second positioning surface (21) and the upper surface of the core plate (20) is greater than 90°, the angle between the second pushing surface (22) and the upper surface of the core plate (20) is less than 90°, and the angle between the pushing slope surface (221) and the upper surface of the core plate (20) is greater than 90°.

4. The arc-shaped bending piece forming die for aviation according to claim 3, characterized in that: The angle between the pushing surface (41) on the pushing block (40) and the upper surface of the pushing block (40) is less than 90°, and the angle between the extrusion surface (42) and the upper surface of the pushing block (40) is less than 90°.

5. The arc-shaped bending piece forming die for aviation according to claim 4, characterized in that: After the core plate (20) is pressed into the molding groove (11), the pushing block (40) is pressed between the pushing slope (221) and the first pushing surface (14), and the extrusion surface (42) abuts against the pushing slope (221) to push the pushing slope (221) forward; the pushing surface (41) abuts against the first pushing surface (14) to push the first pushing surface (14) to move the pushing block (40) and the core plate (20) forward.

6. The arc-shaped bending piece forming die for aviation according to claim 5, characterized in that: The heights of the core plate (20) and the pushing block (40) are both smaller than the depth of the molding groove (11).

7. The arc-shaped bending piece forming die for aviation according to claim 6, characterized in that: The height of the pressing plate (30) is smaller than the height of the molding protrusion (51).

8. A method for forming an arc-shaped bending sheet for aviation, characterized in that: The forming method is applied to the aviation arc-shaped bent sheet forming mold according to any one of claims 1 to 7, and the forming method comprises: After heating the sheet blank, manually shaping the sheet blank into an arc shape; Putting the manually shaped arc-shaped sheet blank into the shaping groove (11) of the lower template (10) so that one side of the sheet blank abuts against the first positioning surface (13) of the shaping groove (11); The core plate (20) is placed vertically into the molding groove (11), and the second positioning surface (21) of the core plate (20) is brought into contact with the other side surface of the sheet blank; The pushing block (40) is pressed vertically between the first pushing surface (14) of the molding groove (11) and the pushing slope (221) of the core plate (20), and the pushing block (40) is pressed downwardly in the vertical direction. The pushing surface (41) of the pushing block (40) pushes toward the first pushing surface (14), and the extrusion surface (42) of the pushing block (40) pushes toward the pushing slope (221), so that the core plate (20) moves toward the first positioning surface (13), and the two side surfaces of the sheet blank are squeezed and molded into the arc-shaped sheet by the first positioning surface (13) and the second positioning surface (21); After heating a portion of the upper edge of the arc-shaped sheet, the upper edge of the arc-shaped sheet is bent manually so that the upper edge of the arc-shaped sheet is bent toward the positioning plane (12) at a preset angle, and then the pressing plate (30) is pressed downward toward the positioning plane (12) so that the upper edge of the arc-shaped sheet abuts against the positioning plane (12); The upper template (50) is pressed down in the vertical direction so that the shaping protrusion (51) of the upper template (50) is pressed into the shaping groove (11) in the vertical direction to fold and shape the arc-shaped sheet blank into an arc-shaped bent sheet.

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