Curved hem member forming mold for aircraft and forming method

Abstract

This invention provides a forming mold and forming method for curved folded parts for aerospace applications. The mold includes a lower template, a pressure plate, an upper template, and extrusion bolts. The lower template has a molding groove with two molding surfaces and two pressure surfaces with multiple first bolt holes. There are two pressure plates with second bolt holes. The lower surface of the pressure plates forms an extrusion surface, and the upper surface forms a first positioning surface. The upper template has molding protrusions and a second positioning surface. Multiple third bolt holes are formed on the two second positioning surfaces. Multiple extrusion bolts pass through the multiple first bolt holes, multiple second bolt holes, and multiple third bolt holes. The lower edges of two micro-curved sheet-like blanks abut against the two molding surfaces, and the upper edges are pressed onto the two pressure surfaces by the extrusion surfaces of the two pressure plates. The multiple extrusion bolts lock together the molding protrusions and molding grooves to extrude curved folded parts, solving the problem that existing titanium alloy processing molds are difficult to process into titanium alloy curved folded parts that meet the requirements.

Description

Technical Field

[0001] This invention relates to the field of titanium alloy molding, and more specifically, to a molding die and molding method for curved edge parts used in aerospace. Background Technology

[0002] In current aircraft, titanium alloys are increasingly used to make parts. Titanium alloys have the characteristics of being lightweight, high-strength, heat-resistant, and corrosion-resistant, which can adapt to various aerospace environments and reduce the weight of the aircraft. However, due to these characteristics, it is relatively difficult to shape titanium alloys in the manufacturing process. Some parts need to be shaped into curved and folded parts, which is difficult to accomplish using existing equipment and shaping processes. Summary of the Invention

[0003] The main objective of this invention is to provide a forming mold and forming method for curved edge parts for aerospace applications, so as to at least solve the problem that existing titanium alloy processing molds are difficult to process into titanium alloy curved edge parts that meet the requirements.

[0004] To achieve the above objectives, a first aspect of the present invention provides a forming mold for curved folded parts for aerospace applications, comprising a lower mold plate, a pressure plate, an upper mold plate, and extrusion bolts; a through molding groove is formed on the upper surface of the lower mold plate along its length direction; two pressing planes are formed on two regions adjacent to the molding groove on the upper surface of the lower mold plate along its width direction; two molding surfaces are formed on the two sidewalls of the molding groove; a plurality of first bolt holes are formed on the two pressing planes; two pressure plates are provided; the shapes of the two pressure plates match the shapes of the two pressing planes; an extrusion surface is formed on the lower surface of the pressure plates, and a first positioning surface is formed on the upper surface of the pressure plates; second bolt holes are provided on the two pressure plates, each corresponding to one of the plurality of first bolt holes; a molding protrusion is provided on the lower surface of the upper mold plate, the molding protrusion extending along the length direction of the upper mold plate and matching the shape of the molding groove; the lower surface of the upper mold plate along its width direction and the molding protrusion Two adjacent areas form two second positioning surfaces; the shapes of the two second positioning surfaces match the two first positioning surfaces respectively; the two second positioning surfaces of the upper template are provided with third bolt holes corresponding to the multiple first bolt holes; there are multiple extrusion bolts, which pass through the multiple first bolt holes, multiple second bolt holes and multiple third bolt holes respectively to connect the lower template, the two pressure plates and the upper template; one side of the lower edge of the two micro-curved sheet blanks abuts against the two shaping surfaces respectively, and the upper edge of the two micro-curved sheet blanks is bent toward the two pressure planes to a preset angle; the extrusion surfaces of the two pressure plates press the upper edges of the two micro-curved sheet blanks onto the two pressure planes respectively; the multiple extrusion bolts are locked synchronously to make the upper template move toward the lower template to extrude and fold the micro-curved sheet blanks into curved folded parts through the shaping protrusions, the two pressure plates and the shaping groove.

[0005] Furthermore, the width of the inner side of the molding groove is smaller than the width of the two ends of the molding groove.

[0006] Furthermore, the shaping surface has a multi-bending structure along the length of the lower template; the two shaping surfaces are symmetrical to each other along the width of the lower template so that the shaping groove forms a fish-shaped groove.

[0007] Furthermore, the shaping surface includes a curved vertical edge and a curved edging; the bottom edge of the curved vertical edge is perpendicularly adjacent to the bottom surface of the shaping groove, and the fixed edge of the curved vertical edge is perpendicularly adjacent to the side edge of the pressing plane; the lower edge of the micro-curved sheet blank abuts against the curved vertical edge; the top edge of the curved vertical edge is connected to the edge of the pressing plane through the curved edging; the bent parts of the upper and lower edges of the micro-curved sheet blank abut against the curved edging.

[0008] Furthermore, the corners of the curved edging are rounded to form an arc-shaped transition surface.

[0009] Furthermore, the sum of the depth of the molding groove and the thickness of the pressure plate is matched with the height of the molding protrusion.

[0010] Furthermore, the multiple first bolt holes, multiple second bolt holes, and multiple third bolt holes are all divided into two groups; the two groups of first bolt holes are symmetrical to each other along the width direction of the lower template; the two groups of second bolt holes are symmetrical to each other along the width direction of the two pressure plates; and the two groups of third bolt holes are symmetrical to each other along the width direction of the upper template.

[0011] A second aspect of the present invention provides a molding method applied to a molding die for curved edge parts for aerospace applications. The molding method includes: placing two micro-curved sheet blanks into a molding groove of a lower template, with the sides of the two micro-curved sheet blanks respectively abutting against two molding surfaces in the molding groove; heating the two micro-curved sheet blanks and bending their upper edges; placing two pressure plates on two pressure surfaces of the lower template and pressing the bent upper edges of the two micro-curved sheet blanks onto the pressure surfaces; pressing the molding protrusion of the upper template toward the molding groove; when the molding protrusion abuts against the molding groove, passing multiple extrusion bolts through multiple third bolt holes of the upper template, multiple second bolt holes of the two pressure plates, and multiple first bolt holes of the lower template to lock the upper template, the two pressure plates, and the lower template, further extruding and bending the micro-curved sheet blanks into a curved edge part.

[0012] The forming mold for curved folded parts for aviation applications using the technical solution of this invention includes a lower template, a pressure plate, an upper template, and extrusion bolts. A through-type molding groove is formed on the upper surface of the lower template along its length. Two pressure planes are formed on the upper surface of the lower template along its width, adjacent to the molding groove. Two sidewalls of the molding groove form two molding surfaces. Multiple first bolt holes are formed on the two pressure planes. There are two pressure plates. The shapes of the two pressure plates match the shapes of the two pressure planes. An extrusion surface is formed on the lower surface of the pressure plates, and a first positioning surface is formed on the upper surface of the pressure plates. Second bolt holes, corresponding one-to-one with the multiple first bolt holes, are formed on the two pressure plates. A molding protrusion is provided on the lower surface of the upper template, extending along the length of the upper template and matching the shape of the molding groove. Two second positioning surfaces are formed on the lower surface of the lower template along its width, adjacent to the molding protrusion. The shapes are respectively matched with the two first positioning surfaces; the two second positioning surfaces of the upper template are provided with third bolt holes corresponding to the multiple first bolt holes; there are multiple extrusion bolts, which pass through the multiple first bolt holes, multiple second bolt holes and multiple third bolt holes to connect the lower template, the two pressure plates and the upper template; one side of the lower edge of the two micro-curved sheet blanks abuts against the two shaping surfaces respectively, and the upper edge of the two micro-curved sheet blanks is bent towards the two pressure planes to a preset angle; the extrusion surfaces of the two pressure plates press the upper edges of the two micro-curved sheet blanks onto the two pressure planes respectively; the multiple extrusion bolts are locked synchronously to make the upper template move towards the lower template so that the micro-curved sheet blanks are extruded and folded into curved folded parts through the shaping protrusions, the two pressure plates and the shaping groove, which solves the problem that the titanium alloy processing molds in the prior art are difficult to process into titanium alloy curved folded parts that meet the requirements. Attached Figure Description

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

[0014] Figure 1 This is a schematic diagram of the main structure of a molding die for a curved edge part for aviation, which is optional according to an embodiment of the present invention;

[0015] Figure 2 This is a schematic diagram showing a detailed portion of a molding die for a curved edge part for aviation, which is an optional embodiment of the present invention.

[0016] The above figures include the following reference numerals:

[0017] 10. Lower template; 11. Molding groove; 12. Pressing plane; 13. Molding surface; 131. Curved vertical edge; 132. Curved edging; 14. First bolt hole; 20. Pressing plate; 21. Extrusion surface; 22. First positioning surface; 23. Second bolt hole; 30. Upper template; 31. Molding protrusion; 32. Second positioning surface; 33. Third bolt hole; 40. Extrusion bolt. Detailed Implementation

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] According to embodiments of the present invention, a molding die for forming curved folded parts for aviation applications, such as... Figure 1As shown, the assembly includes a lower template 10, a pressure plate 20, an upper template 30, and extrusion bolts 40. A through-hole molding groove 11 is formed on the upper surface of the lower template 10 along its length. Two areas adjacent to the molding groove 11 on the upper surface of the lower template 10 along its width form two pressing planes 12. Two sidewalls of the molding groove 11 form two molding surfaces 13. Multiple first bolt holes 14 are formed on the two pressing planes 12. There are two pressure plates 20. The shapes of the two pressure plates 20 match the shapes of the two pressing planes 12. The lower surface of the pressure plate 20 forms an extrusion surface 21, and the upper surface of the pressure plate 20 forms a first bolt hole 40. A positioning surface 22; two pressure plates 20 are provided with second bolt holes 23 corresponding to a plurality of first bolt holes 14; a molding protrusion 31 is provided on the lower surface of the upper template 30, the molding protrusion 31 extends along the length of the upper template 30 and matches the shape of the molding groove 11; two areas on the lower surface of the upper template 30 adjacent to the molding protrusion 31 along its width direction form two second positioning surfaces 32; the shapes of the two second positioning surfaces 32 match the two first positioning surfaces 22 respectively; the two second positioning surfaces 32 of the upper template 30 are provided with third bolt holes 33 corresponding to a plurality of first bolt holes 14; extrusion Multiple pressing bolts 40 are used, each passing through a corresponding set of first bolt holes 14, second bolt holes 23, and third bolt holes 33 to connect the lower template 10, the two pressure plates 20, and the upper template 30. One side of the lower edge of each of the two micro-curved sheet-like blanks abuts against two shaping surfaces 13, and the upper edges of the two micro-curved sheet-like blanks are bent towards the two pressure surfaces 12 at a preset angle. The pressing surfaces 21 of the two pressure plates 20 press the upper edges of the two micro-curved sheet-like blanks onto the two pressure surfaces 12. The multiple pressing bolts 40 are simultaneously tightened to make the upper template 30 face downwards. The template 10 moves to extrude and fold the micro-curved sheet blank into a curved folded part through the molding protrusion 31, two pressure plates 20 and molding groove 11. Specifically, during extrusion, the two second positioning surfaces 32 abut against the two first positioning surfaces 22 respectively, and the lower surface of the molding protrusion 31 abuts against the bottom of the molding groove 11, extruding the lower edge of the micro-curved sheet blank into a curved surface that matches the shape of the side surface of the plastic surface 13. The upper edge of the bent micro-curved sheet blank is extruded and bent into a preset folded edge, which solves the problem that the titanium alloy processing molds in the prior art are difficult to process into titanium alloy curved folded parts that meet the requirements.

[0020] In specific implementation, such as Figure 2 As shown, the width of the inner side of the molding groove 11 is smaller than the width of the two ends of the molding groove 11. Since the two side walls of the molding groove 11 are curved molding surfaces 13, the distance between the two side walls varies according to the curved shape, but the distance is smaller than the width of the two ends of the molding groove 11 to correspond to the shape of the final processed part.

[0021] In specific implementation, such as Figure 2As shown, the shaping surface 13 has a multi-bending structure along the length direction of the lower template 10; the two shaping surfaces 13 are symmetrical to each other along the width direction of the lower template 10 so that the shaping groove 11 forms a fish-shaped groove, and the lower surface of the shaping protrusion 31 corresponding to the shape of the shaping groove 11 is also a corresponding fish-shaped shape.

[0022] In specific implementation, such as Figure 1 and Figure 2 As shown, the shaping surface 13 includes a curved vertical edge surface 131 and a curved edging 132. The bottom edge of the curved vertical edge surface 131 is perpendicularly adjacent to the bottom surface of the shaping groove 11, and the fixed edge of the curved vertical edge surface 131 is perpendicularly adjacent to the side edge of the pressing plane 12. The lower edge of the micro-curved sheet blank abuts against the curved vertical edge surface 131. The top edge of the curved vertical edge surface 131 is connected to the edge of the pressing plane 12 through the curved edging 132. The bent parts of the upper and lower edges of the micro-curved sheet blank abut against the curved edging 132. The curved vertical edge surface 131 is connected to the pressing plane 12 through the curved edging 132, making its connection part different from the common right-angle connection structure. This avoids the collision between the connecting corners of each side when the upper template 30 and the lower template 10 are connected and extruded, which could lead to operational accidents and affect the shaping effect.

[0023] In specific implementation, such as Figure 1 and Figure 2 As shown, the edge corners of the curved edging 132 are rounded to form an arc-shaped transition surface. Since the lower edge and upper edge of the micro-curved sheet blank abut at the curved edging 132, if a right-angle structure is used, the upper edge of the micro-curved sheet blank is prone to breakage during the bending and extrusion process. The rounded corner design avoids this situation.

[0024] In specific implementation, such as Figure 1 As shown, the sum of the depth of the molding groove 11 and the thickness of the pressure plate 20 is matched with the height of the molding protrusion 31. Assuming that the sum of the depth of the molding groove 11 and the thickness of the pressure plate 20 is greater than the height of the molding protrusion 31, when the upper template 30 presses downward and the two second positioning surfaces 32 abut against the two first positioning surfaces 22, the lower surface of the molding protrusion 31 cannot abut against the bottom of the molding groove 11, resulting in the lower edge of the micro-curved sheet blank lacking corresponding extrusion and failing to meet the molding standard. Therefore, in order to achieve the molding purpose, the sum of the depth of the molding groove 11 and the thickness of the pressure plate 20 must match the height of the molding protrusion 31.

[0025] In specific implementation, such as Figure 1As shown, the multiple first bolt holes 14, multiple second bolt holes 23, and multiple third bolt holes 33 are all divided into two groups; the two groups of first bolt holes 14 are symmetrical to each other along the width direction of the lower template 10; the two groups of second bolt holes 23 are symmetrical to each other along the width direction of the two pressure plates 20; the two groups of third bolt holes 33 are symmetrical to each other along the width direction of the upper template 30; when the lower template 10, pressure plate 20, and upper template 30 are extruded, as a mold composed of three separate parts (upper, middle, and lower), displacement may occur during the extrusion process. By fixing these three parts with extrusion bolts 40, displacement can be avoided from affecting the extrusion molding effect.

[0026] According to an embodiment of the present invention, the molding method is applied to a molding die for curved edge-folded parts for aerospace applications. The molding method includes: placing two micro-curved sheet-like blanks into the molding groove 11 of the lower mold 10, with the sides of the two micro-curved sheet-like blanks respectively abutting against two molding surfaces 13 in the molding groove 11; then heating the two micro-curved sheet-like blanks and bending their upper edges; placing two pressure plates 20 on the two pressure surfaces 12 of the lower mold 10, and pressing the bent upper edges of the two micro-curved sheet-like blanks onto the pressure surfaces 12; pressing the molding protrusions 31 of the upper mold 30 toward the molding groove 11, and pressing the molding protrusions 31 toward the molding groove 11. When the molding groove 11 abuts, multiple extrusion bolts 40 are passed through multiple third bolt holes 33 of the upper template 30, multiple second bolt holes 23 of the two pressure plates 20, and multiple first bolt holes 14 of the lower template 10 to lock the upper template 30, the two pressure plates 20, and the lower template 10, thereby further extruding and folding the micro-curved sheet blank into a curved folded part. This forming method is used in conjunction with the forming mold for curved folded parts for aviation. During operation, the various parts in the mold and the extrusion bolts 40 are used to shape and extrude, avoiding the inconsistency of the specifications and standards of the processed curved folded parts for aviation caused by manual molding and extrusion operations.

[0027] To illustrate the working principle of this invention using a practical application example, first, the molding groove 11 of the lower template 10 is placed facing upwards. Then, the two micro-curved sheet blanks are placed close to each other along the two molding surfaces 13 of the sidewall of the molding groove 11. The upper edges of the two micro-curved sheet blanks are bent toward the pressing plane 12 until the upper edges are almost in contact with the pressing plane 12. Then, the two pressing plates 20 are pressed down, thereby pressing the upper edges of the two micro-curved sheet blanks between the two pressing plates 20 and the pressing plane 12. The upper template 30 is pressed down, wherein the molding protrusion 31 is squeezed corresponding to the molding groove 11. At the same time, the upper template 30, the pressing plate 20, and the lower template 10 are fixed and locked by the extrusion bolts 40 passing through multiple third bolt holes 33, multiple second bolt holes 23, and multiple first bolt holes 14. The locking generates pressure, which also makes the gaps between the parts smaller and increases the extrusion force, thus extruding the micro-curved sheet blanks into curved edge parts for aerospace applications.

[0028] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An aircraft curved hem forming die characterized by, The utility model relates to a plastic moulding device for micro-curved folding edge product, which comprises: a lower mould plate (10) with a through plastic groove (11) on its upper surface along the length direction; two pressing planes (12) are formed on the upper surface of the lower mould plate (10) along the width direction and adjacent to the plastic groove (11); two side walls of the plastic groove (11) form two plastic surfaces (13); a plurality of first bolt holes (14) are formed on the two pressing planes (12); two pressing plates (20) with the same shape as the two pressing planes (12); an extrusion surface (21) is formed on the lower surface of the pressing plate (20), and a first positioning surface (22) is formed on the upper surface of the pressing plate (20); a plurality of second bolt holes (23) corresponding to the first bolt holes (14) are formed on the two pressing plates (20); an upper mould plate (30) with a plastic protrusion (31) on its lower surface; the plastic protrusion (31) extends along the length direction of the upper mould plate (30) and matches the shape of the plastic groove (11); two second positioning surfaces (32) are formed on the lower surface of the upper mould plate (30) along the width direction and adjacent to the plastic protrusion (31); the shapes of the two second positioning surfaces (32) match the shapes of the two first positioning surfaces (22) respectively; a plurality of third bolt holes (33) corresponding to the first bolt holes (14) are formed on the two second positioning surfaces (32) of the upper mould plate (30); a plurality of extrusion bolts (40) corresponding to the first bolt holes (14), the second bolt holes (23) and the third bolt holes (33) to connect the lower mould plate (10), the two pressing plates (20) and the upper mould plate (30); wherein, the side surfaces of the lower edges of the two micro-curved sheet-shaped blanks respectively abut against the two plastic surfaces (13), and the upper edges of the two micro-curved sheet-shaped blanks are bent to a preset angle towards the two pressing planes (12); the extrusion surfaces (21) of the two pressing plates (20) press the upper edges of the two micro-curved sheet-shaped blanks on the two pressing planes (12); the extrusion bolts (40) are locked synchronously to make the upper mould plate (30) move towards the lower mould plate (10) to extrude and fold the micro-curved sheet-shaped blanks into a curved folding edge product through the plastic protrusion (31), the two pressing plates (20) and the plastic groove (11).

2. The curved hem forming die for aircraft use according to claim 1, characterized by, The width of the inner side of the plastic groove (11) is smaller than the width of the two ends of the plastic groove (11).

3. The curved hem forming die for aircraft use according to claim 2, characterized by, The plastic surfaces (13) have a multiple bending structure along the length direction of the lower mould plate (10); the two plastic surfaces (13) are symmetrical along the width direction of the lower mould plate (10) to form a fish-shaped groove.

4. The curved hem forming die for aircraft use according to claim 3, characterized by The plastic surfaces (13) comprise: A curved vertical edge surface (131) vertically abuts with a groove bottom surface of the molding groove (11) at a bottom edge of the curved vertical edge surface (131), and vertically abuts with a side edge of the material pressing plane (12) at a fixed edge of the curved vertical edge surface (131); a lower edge of the micro-curved sheet-shaped blank abuts with the curved vertical edge surface (131); A curved edge cover (132) connects the top edge of the curved vertical edge surface (131) with the edge of the material pressing plane (12) in a transition manner; the bending part of the upper edge and the lower edge of the micro-curved sheet-shaped blank abuts with the curved edge cover (132).

5. The curved hem forming die for aircraft use according to claim 4, characterized by The edge angle of the curved edge cover (132) is a rounded structure to form a circular arc transition surface.

6. The curved hem forming die for aircraft use according to claim 5, characterized by The sum of the depth of the molding groove (11) and the thickness of the material pressing plate (20) matches the height of the molding protrusion (31).

7. The curved hem forming die for aircraft use according to claim 6, characterized by The plurality of first bolt holes (14), the plurality of second bolt holes (23) and the plurality of third bolt holes (33) are divided into two groups; the two groups of first bolt holes (14) are mutually symmetrical along the width direction of the lower mold plate (10); the two groups of second bolt holes (23) are mutually symmetrical along the width direction of the two material pressing plates (20); the two groups of third bolt holes (33) are mutually symmetrical along the width direction of the upper mold plate (30).

8. A method for forming curved edge parts for aviation applications, characterized in that, The forming method is applied to the curved edge folding member forming mold of any one of claims 1 to 7, and the forming method comprises: Placing two micro-curved sheet-shaped blanks into the molding groove (11) of the lower mold plate (10), and the side surfaces of the two micro-curved sheet-shaped blanks respectively abut with the two shaping surfaces (13) in the molding groove (11); then bending the upper edges of the two micro-curved sheet-shaped blanks after heating; Placing the two material pressing plates (20) on the two material pressing planes (12) of the lower mold plate (10), and pressing the bent upper edges of the two micro-curved sheet-shaped blanks on the material pressing planes (12); Extruding the molding protrusion (31) of the upper mold plate (30) towards the molding groove (11), when the molding protrusion (31) abuts with the molding groove (11), corresponding the plurality of extrusion bolts (40) through the plurality of third bolt holes (33) of the upper mold plate (30), the plurality of second bolt holes (23) of the two material pressing plates (20) and the plurality of first bolt holes (14) of the lower mold plate (10), locking the upper mold plate (30), the two material pressing plates (20) and the lower mold plate (10), and further extruding and folding the micro-curved sheet-shaped blank to form a curved edge folding member.

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