Forming tool and method for helicopter tail rotor blade balance support

Abstract

The invention discloses a forming tool for a helicopter tail rotor blade balance support, and relates to the technical field of aviation product forming, a limiting groove is formed in the top surface of a lower die, a lower forming male die is arranged on the bottom surface of the limiting groove, a plurality of lower ejection holes are formed in the bottom surface of the limiting groove, a middle die can be arranged in the limiting groove, and the lower forming male die is arranged in the limiting groove. A forming hole is formed in the middle die, an upper forming convex die is arranged on the bottom surface of the upper die, and a plurality of upper ejection holes are formed in the bottom surface of the upper die; a forming cavity of the balance support is defined by the top face of the lower forming male die, the bottom face of the upper forming male die and the inner side wall of the forming hole. The top end of the lower ejector pin can penetrate through the lower ejector hole and can be in contact with the bottom surface of the middle mold; the bottom end of the upper ejector pin can penetrate through the upper ejector hole, and the top end of the upper ejector pin can be in contact with the top surface of the lower mold; the manufacturing efficiency of the balance support can be effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of aviation product molding, and in particular to a molding tool and method for a helicopter tail rotor blade balance support. Background Art

[0002] The helicopter tail rotor blade is used to be installed at the tail of the helicopter. By changing the size of the tail rotor pulling force, the heading of the helicopter can be controlled, making the helicopter more stable and flexible during flight. The balance support is located in the middle and rear part of the tail rotor blade. It is used as a balance weight for the entire tail rotor blade and is an important part of the tail rotor blade. It is now necessary to make a balance support with a square outer contour, special-shaped surfaces on the upper and lower surfaces, and short-cut fiber as the material. How to quickly and efficiently make the balance support has become an urgent problem to be solved. Summary of the invention

[0003] The purpose of the present invention is to provide a molding tool and method for a helicopter tail rotor blade balance support to solve the problems existing in the above-mentioned prior art and to effectively improve the manufacturing efficiency of the balance support.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a molding tool for a helicopter tail rotor blade balance support, comprising an upper mold, a middle mold, a lower mold, an upper unloading mold plate and a lower unloading mold plate, wherein a limiting groove is provided on the top surface of the lower mold, a lower molding convex mold is provided on the bottom surface of the limiting groove, a plurality of lower ejection holes are provided on the bottom surface of the limiting groove, and each of the lower ejection holes is arranged around the lower molding convex mold, the middle mold can be placed in the limiting groove, a molding hole is provided on the middle mold, the upper mold is placed above the lower mold and the middle mold, an upper molding convex mold is provided on the bottom surface of the upper mold, a plurality of upper ejection holes are provided on the bottom surface of the upper mold, and each of the upper ejection holes is arranged around the upper molding convex mold; the lower molding convex mold can extend into the molding hole from below the molding hole, and the upper molding convex mold can extend into the molding hole from above the molding hole; The top surface of the lower forming punch, the bottom surface of the upper forming punch and the inner side wall of the forming hole form a forming chamber of the balance support; the lower unloading template is placed below the lower die, and a plurality of lower ejector pins are fixedly arranged on the lower unloading template, the number of the lower ejector pins is equal to the number of the lower ejector holes, the lower ejector pins correspond to the lower ejector holes one-to-one, the top ends of the lower ejector pins can pass through the lower ejector holes, and the top ends of the lower ejector pins can contact the bottom surface of the middle die; the upper unloading template is placed above the upper die, and a plurality of upper ejector pins are fixedly arranged on the upper unloading template, the number of the upper ejector pins is equal to the number of the upper ejector holes, the upper ejector pins correspond to the upper ejector holes one-to-one, the bottom ends of the upper ejector pins can pass through the upper ejector holes, and the top ends of the upper ejector pins can contact the top surface of the lower die.

[0006] Preferably, a first demoulding gap is left between the outer side wall of the middle mold and the inner side wall of the limiting groove.

[0007] Preferably, a second demolding gap is left between the outer side wall of the lower molding punch and the inner side wall of the molding hole, and a third demolding gap is left between the outer side wall of the upper molding punch and the inner side wall of the molding hole.

[0008] Preferably, a first rounded corner portion is provided at a connection between the bottom surface of the middle mold and the inner side wall of the forming hole, and a second rounded corner portion is provided at a connection between the top surface of the middle mold and the inner side wall of the forming hole.

[0009] Preferably, the middle mold includes a middle left mold and a middle right mold, a left molding groove is opened on the right side surface of the middle left mold, and a right molding groove is opened on the left side surface of the middle right mold, the middle left mold and the middle right mold can be assembled to form the middle mold, and the left molding groove and the right molding groove form the molding hole.

[0010] Preferably, a prying opening is provided at the joint between the middle left mold and the middle right mold.

[0011] Preferably, the lower removal template is threadedly connected to the lower ejector pin.

[0012] Preferably, the upper and lower removal template is threadedly connected to the upper ejection pin.

[0013] Preferably, the number of the lower forming punches is two, the number of the forming holes opened on the middle die is two, the number of the upper forming punches is two, and the lower forming punches, the forming holes and the upper forming punches correspond one to one.

[0014] The present invention also provides a method for forming a helicopter tail rotor blade balance support, which uses the above-mentioned molding tool for the helicopter tail rotor blade balance support to manufacture the helicopter tail rotor blade balance support, comprising the following steps:

[0015] Step 1: Preheat the upper mold, middle mold and lower mold;

[0016] Step 2: Place the middle die in the limiting groove on the lower die, and extend the lower forming punch into the forming hole from below the forming hole;

[0017] Step 3: Add the chopped fibers into the forming holes on the middle mold;

[0018] Step 4: Place the upper die above the lower die and the middle die, and extend the upper forming punch from above the forming hole into the forming hole;

[0019] Step 5: placing the upper mold, middle mold and lower mold assembly obtained in step 4 on a hot press to pressurize and heat, then maintain the pressure and cool;

[0020] Step 6: Place the lower unloading template on the press, place the upper mold, middle mold and lower mold combined closed body on the top of the lower unloading template, and make the top end of the lower ejector pin pass through the lower ejector hole to contact the bottom surface of the middle mold, place the upper unloading template on the upper mold, middle mold and lower mold combined closed body, and make the bottom end of the upper ejector pin pass through the upper ejector hole to contact the top surface of the lower mold;

[0021] Step 7: Start the press, separate the upper die, middle die and lower die, and take out the balance support in the forming hole.

[0022] Compared with the prior art, the present invention has achieved the following technical effects:

[0023] The present invention provides a molding tool and method for a helicopter tail rotor blade balance support. The middle mold is placed in a limiting groove on a lower mold, which can effectively limit the middle mold, so that the lower molding convex mold extends from the bottom of the molding hole into the molding hole, and the upper molding convex mold extends from the top of the molding hole into the molding hole, which can surround a molding chamber for the balance support. When in use, before the upper molding convex mold extends from the top of the molding hole into the molding hole, short-cut fibers are added into the molding hole on the middle mold, and then the upper molding convex mold extends from the top of the molding hole into the molding hole, and then the upper mold, the middle mold and the lower mold combined closed body are placed on a hot press to assemble the balance support. The chopped fibers in the molding chamber can be hot-pressed and solidified. After holding the pressure and cooling, the top end of the lower ejector pin is passed through the lower ejector hole to contact the bottom surface of the middle mold, and the bottom end of the upper ejector pin is passed through the upper ejector hole to contact the top surface of the lower mold. The pressure of the press is used to move the lower ejector pin and the upper ejector pin toward each other, so that the upper mold, the middle mold and the lower mold can be separated, and the balance support in the molding hole can be taken out. The molding tool structure of the helicopter tail rotor blade balance support provided in this embodiment is simple, convenient for hot pressing molding of the balance support, and easy to demold, thereby effectively improving the manufacturing efficiency of the balance support. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of a molding tool for a helicopter tail rotor blade balancing support provided by the present invention;

[0026] In the figure: 1-lower unloading template, 2-lower ejector pin, 3-lower mold, 4-middle right mold, 5-middle left mold, 6-balance support, 7-upper mold, 8-upper ejector pin, 9-upper unloading template. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The purpose of the present invention is to provide a molding tool and method for a helicopter tail rotor blade balance support to solve the problems existing in the above-mentioned prior art and to effectively improve the manufacturing efficiency of the balance support.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Embodiment 1

[0031] like Figure 1 As shown, this embodiment provides a molding tool for a helicopter tail rotor blade balance support, including an upper mold 7, a middle mold, a lower mold 3, an upper unloading mold plate 9 and a lower unloading mold plate 1. A limiting groove is provided on the top surface of the lower mold 3, and a lower molding convex mold is provided on the bottom surface of the limiting groove. A plurality of lower ejection holes are provided on the bottom surface of the limiting groove, and each lower ejection hole is arranged around the lower molding convex mold. The middle mold can be placed in the limiting groove, and a molding hole is provided on the middle mold. The upper mold 7 is placed above the lower mold 3 and the middle mold, and an upper molding convex mold is provided on the bottom surface of the upper mold 7. A plurality of upper ejection holes are provided on the bottom surface of the upper mold 7, and each upper ejection hole is arranged around the upper molding convex mold; the lower molding convex mold can extend into the molding hole from below the molding hole, and the upper molding convex mold can extend into the molding hole from above the molding hole; The top surface of the lower forming punch, the bottom surface of the upper forming punch and the inner side wall of the forming hole form a forming chamber of the balance support; the lower unloading template 1 is placed below the lower mold 3, and a plurality of lower ejector pins 2 are fixedly arranged on the lower unloading template 1, the number of the lower ejector pins 2 is equal to the number of the lower ejector holes, the lower ejector pins 2 correspond to the lower ejector holes one by one, the top ends of the lower ejector pins 2 can pass through the lower ejector holes, and the top ends of the lower ejector pins 2 can contact the bottom surface of the middle mold; the upper unloading template 9 is placed above the upper mold 7, and a plurality of upper ejector pins 8 are fixedly arranged on the upper unloading template 9, the number of the upper ejector pins 8 is equal to the number of the upper ejector holes, the upper ejector pins 8 correspond to the upper ejector holes one by one, the bottom ends of the upper ejector pins 8 can pass through the upper ejector holes, and the top ends of the upper ejector pins 8 can contact the top surface of the lower mold 3.

[0032] The molding tool of the helicopter tail rotor blade balance support provided in this embodiment places the middle mold in the limiting groove on the lower mold 3, which can effectively limit the middle mold, so that the lower molding punch extends into the molding hole from the bottom of the molding hole, and the upper molding punch extends into the molding hole from the top of the molding hole, which can surround the molding cavity of the balance support. When in use, before the upper molding punch extends into the molding hole from the top of the molding hole, short-cut fibers are added to the molding hole on the middle mold, and then the upper molding punch extends into the molding hole from the top of the molding hole, and then the upper mold 7, the middle mold and the lower mold 3 are placed on the hot press to form the molding cavity of the balance support. The chopped fibers in the room can be hot-pressed and solidified into shape. After maintaining the pressure and cooling, the top end of the lower ejector pin 2 is passed through the lower ejector hole to contact the bottom surface of the middle mold, and the bottom end of the upper ejector pin 8 is passed through the upper ejector hole to contact the top surface of the lower mold 3. The lower ejector pin 2 and the upper ejector pin 8 are moved toward each other by the pressure of the press, and then the upper mold 7, the middle mold and the lower mold 3 can be pushed apart, and then the balance support 6 in the molding hole can be taken out. The molding tool structure of the helicopter tail rotor blade balance support provided in this embodiment is simple, which is convenient for hot pressing and molding of the balance support 6, and easy to demold, thereby effectively improving the manufacturing efficiency of the balance support 6.

[0033] As a more preferred implementation of this embodiment, a first demoulding gap is left between the outer side wall of the middle mold and the inner side wall of the limiting groove to facilitate assembly and demoulding, thereby improving the manufacturing efficiency of the balancing support 6.

[0034] As a more preferred implementation manner of this embodiment, a second demolding gap is left between the outer wall of the lower molding punch and the inner wall of the molding hole, and a third demolding gap is left between the outer wall of the upper molding punch and the inner wall of the molding hole, which facilitates assembly and demolding and improves the manufacturing efficiency of the balancing support 6.

[0035] As a more preferred implementation manner of this embodiment, the connection between the bottom surface of the middle mold and the inner wall of the forming hole has a first chamfered corner, and the connection between the top surface of the middle mold and the inner wall of the forming hole has a second chamfered corner, which can play a guiding role and prevent the upper molding punch and the lower molding punch from being damaged by collision.

[0036] As a more preferred implementation manner of this embodiment, the middle mold includes a middle left mold 5 and a middle right mold 4. A left molding groove is opened on the right side surface of the middle left mold 5, and a right molding groove is opened on the left side surface of the middle right mold 4. The middle left mold 5 and the middle right mold 4 can be assembled to form a middle mold, and the left molding groove and the right molding groove form a molding hole. The structure is simple, easy to assemble and demold, and the manufacturing efficiency of the balancing support 6 is improved. It should be understood that the terms "left" and "right" are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, and cannot be understood as a limitation on the present invention.

[0037] As a more preferred implementation of this embodiment, a prying opening is provided at the joint of the middle left mold 5 and the middle right mold 4 to facilitate demoulding and improve the manufacturing efficiency of the balance support 6.

[0038] As a more preferred implementation manner of this embodiment, the lower removal template 1 is threadedly connected to the lower ejector pin 2 to facilitate disassembly and assembly; as an optional implementation manner of this embodiment, the lower removal template 1 and the lower ejector pin 2 are assembled as one body by interference fit, and the connection is more stable.

[0039] As a more preferred implementation manner of this embodiment, the upper and lower template 9 is threadedly connected to the upper ejection pin 8 to facilitate disassembly and assembly; as an optional implementation manner of this embodiment, the upper and lower template 9 and the upper ejection pin 8 are assembled as one body by interference fit, and the connection is more stable.

[0040] As a more preferred implementation manner of this embodiment, the number of lower forming punches is two, the number of forming holes opened on the middle mold is two, the number of upper forming punches is two, and the lower forming punches, the forming holes and the upper forming punches correspond one to one, which can effectively improve the production efficiency of the product.

[0041] Embodiment 2

[0042] This embodiment provides a method for forming a helicopter tail rotor blade balance support, and uses the molding tool of the helicopter tail rotor blade balance support in the first embodiment to manufacture the helicopter tail rotor blade balance support 6, including the following steps:

[0043] Step 1: Preheat the upper mold 7, the middle mold and the lower mold 3;

[0044] Step 2: Place the middle die in the limiting groove on the lower die 3, and extend the lower forming punch into the forming hole from below the forming hole;

[0045] Step 3: Add the chopped fibers into the forming holes on the middle mold;

[0046] Step 4: Place the upper die 7 above the lower die 3 and the middle die, and extend the upper forming convex die into the forming hole from above the forming hole;

[0047] Step 5: Place the upper mold 7, middle mold and lower mold 3 combined closed body obtained in step 4 on a hot press to pressurize and heat, then maintain the pressure and cool;

[0048] Step 6: Place the lower unloading plate 1 on the press, place the upper die 7, the middle die and the lower die 3 combined closed body on the upper unloading plate 1, and make the top end of the lower ejector pin 2 pass through the lower ejector hole to contact the bottom surface of the middle die, place the upper unloading plate 9 on the upper die 7, the middle die and the lower die 3 combined closed body, and make the bottom end of the upper ejector pin 8 pass through the upper ejector hole to contact the top surface of the lower die 3;

[0049] Step 7: Start the press, separate the upper die 7, the middle die and the lower die 3, and take out the balancing support 6 in the forming hole.

[0050] The molding method of the helicopter tail rotor blade balance support provided in this embodiment places the middle mold in the limiting groove on the lower mold 3, which can effectively limit the middle mold, so that the lower molding convex mold extends into the molding hole from the bottom of the molding hole, and the upper molding convex mold extends into the molding hole from the top of the molding hole, which can surround the molding cavity of the balance support. When in use, before the upper molding convex mold extends into the molding hole from the top of the molding hole, short-cut fibers are added to the molding hole on the middle mold, and then the upper molding convex mold extends into the molding hole from the top of the molding hole, and then the upper mold 7, the middle mold and the lower mold 3 are placed on the hot press to form the molding cavity of the balance support. The chopped fibers in the room can be hot-pressed and solidified into shape. After maintaining the pressure and cooling, the top end of the lower ejector pin 2 is passed through the lower ejector hole to contact the bottom surface of the middle mold, and the bottom end of the upper ejector pin 8 is passed through the upper ejector hole to contact the top surface of the lower mold 3. The lower ejector pin 2 and the upper ejector pin 8 are moved toward each other by the pressure of the press, and then the upper mold 7, the middle mold and the lower mold 3 can be pushed apart, and then the balance support 6 in the molding hole can be taken out. The molding tool structure of the helicopter tail rotor blade balance support provided in this embodiment is simple, which is convenient for hot pressing and molding of the balance support 6, and easy to demold, thereby effectively improving the manufacturing efficiency of the balance support 6.

[0051] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A molding tool for a helicopter tail rotor blade balance support, characterized in that: The invention comprises an upper die, a middle die, a lower die, an upper unloading die plate and a lower unloading die plate, wherein a limiting groove is provided on the top surface of the lower die, a lower forming convex die is provided on the bottom surface of the limiting groove, a plurality of lower ejection holes are provided on the bottom surface of the limiting groove, and each of the lower ejection holes is arranged around the lower forming convex die, the middle die can be placed in the limiting groove, a forming hole is provided on the middle die, the upper die is placed above the lower die and the middle die, an upper forming convex die is provided on the bottom surface of the upper die, a plurality of upper ejection holes are provided on the bottom surface of the upper die, and each of the upper ejection holes is arranged around the upper forming convex die; the lower forming convex die can extend into the forming hole from below the forming hole, and the upper forming convex die can extend into the forming hole from above the forming hole; the top surface of the lower forming convex die, the upper The bottom surface of the forming punch and the inner side wall of the forming hole form a forming chamber of the balancing support; the lower unloading template is placed below the lower die, and a plurality of lower ejector pins are fixedly arranged on the lower unloading template, the number of the lower ejector pins is equal to the number of the lower ejector holes, the lower ejector pins correspond one-to-one to the lower ejector holes, the top ends of the lower ejector pins can pass through the lower ejector holes, and the top ends of the lower ejector pins can contact the bottom surface of the middle die; the upper unloading template is placed above the upper die, and a plurality of upper ejector pins are fixedly arranged on the upper unloading template, the number of the upper ejector pins is equal to the number of the upper ejector holes, the upper ejector pins correspond one-to-one to the upper ejector holes, the bottom ends of the upper ejector pins can pass through the upper ejector holes, and the top ends of the upper ejector pins can contact the top surface of the lower die.

2. The molding tool for the helicopter tail rotor blade balance support according to claim 1, characterized in that: A first demoulding gap is left between the outer side wall of the middle mold and the inner side wall of the limiting groove.

3. The molding tool for the helicopter tail rotor blade balance support according to claim 2 is characterized in that: A second demolding gap is left between the outer side wall of the lower molding punch and the inner side wall of the molding hole, and a third demolding gap is left between the outer side wall of the upper molding punch and the inner side wall of the molding hole.

4. The molding tool for the helicopter tail rotor blade balance support according to claim 1, characterized in that: A first rounded corner portion is provided at a connection between the bottom surface of the middle mold and the inner side wall of the molding hole, and a second rounded corner portion is provided at a connection between the top surface of the middle mold and the inner side wall of the molding hole.

5. The molding tool for the helicopter tail rotor blade balance support according to claim 1, characterized in that: The middle mold includes a middle left mold and a middle right mold. A left molding groove is provided on the right side surface of the middle left mold, and a right molding groove is provided on the left side surface of the middle right mold. The middle left mold and the middle right mold can be assembled to form the middle mold, and the left molding groove and the right molding groove form the molding hole.

6. The molding tool for the helicopter tail rotor blade balance support according to claim 5, characterized in that: A prying opening is provided at the joint of the middle left mold and the middle right mold.

7. The molding tool for the helicopter tail rotor blade balance support according to claim 1, characterized in that: The lower removal template is threadedly connected to the lower ejector pin.

8. The molding tool for the helicopter tail rotor blade balance support according to claim 7, characterized in that: The upper and lower disassembly template is threadedly connected with the upper ejection pin.

9. The molding tool for the helicopter tail rotor blade balance support according to claim 1, characterized in that: The number of the lower forming punches is two, the number of the forming holes opened on the middle die is two, the number of the upper forming punches is two, and the lower forming punches, the forming holes and the upper forming punches correspond to each other one by one.

10. A method for forming a helicopter tail rotor blade balancing support, using the molding tool for the helicopter tail rotor blade balancing support as claimed in any one of claims 1 to 9 to manufacture the helicopter tail rotor blade balancing support, characterized in that: The following steps are involved: Step 1: Preheat the upper mold, middle mold and lower mold; Step 2: Place the middle die in the limiting groove on the lower die, and extend the lower forming punch into the forming hole from below the forming hole; Step 3: Add the chopped fibers into the forming holes on the middle mold; Step 4: Place the upper die above the lower die and the middle die, and extend the upper forming punch from above the forming hole into the forming hole; Step 5: placing the upper mold, middle mold and lower mold assembly obtained in step 4 on a hot press to pressurize and heat, then maintain the pressure and cool; Step 6: Place the lower unloading template on the press, place the upper mold, middle mold and lower mold combined closed body on the top of the lower unloading template, and make the top end of the lower ejector pin pass through the lower ejector hole to contact the bottom surface of the middle mold, place the upper unloading template on the upper mold, middle mold and lower mold combined closed body, and make the bottom end of the upper ejector pin pass through the upper ejector hole to contact the top surface of the lower mold; Step 7: Start the press, separate the upper die, middle die and lower die, and take out the balance support in the forming hole.

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