Fan blade machining die

Abstract

The utility model provides a fan blade machining die which comprises an upper die and a lower die which are matched to form a blade forming cavity and a blade tip movable insert detachably connected to the lower die, the end portion of one end of the lower die is sunken in the thickness direction of a blade tip to form a first insert groove, the blade tip movable insert is arranged on the first insert groove, and the blade tip movable insert is arranged in the first insert groove. The surface, facing the blade tip, of the blade tip movable insert is matched with the molded surface of the blade tip end, and the top of the blade tip movable insert is flush with the top of the blade tip. The fan blade machining mold has the advantages that molded surface defects such as glue shortage or holes are not prone to being generated at the blade tip, and demolding is easy.

Description

Technical Field

[0001] The utility model belongs to the technical field of fan blade manufacturing, and in particular relates to a fan blade processing mould. Background Art

[0002] At present, composite fan blades are one of the important components of cooling fan systems. Their main function is to drive water to flow quickly to achieve the effect of cooling. Traditional fan blades are made of metal or alloy. Composite fan blades have better performance and efficiency due to their high strength, low density, excellent corrosion resistance and other advantages. Composite fan blades are made of fiber-reinforced composite materials. The fibers are mainly carbon fiber or glass fiber, and the matrix material is generally epoxy resin. The selection of fibers and matrix can be determined according to the performance requirements and operating conditions of the blades, in order to achieve better strength, stiffness and fatigue performance.

[0003] Traditional composite fan blades are formed by hand lay-up. During the forming process, the parting surface is placed on the middle surface of the model. At the tip of the blade, after all the prepregs are laid, it is equivalent to half of the blade tip being in the lower mold and half in the upper mold. When under pressure, as the temperature rises, the prepreg softens and flows through the gap between the upper mold and the lower mold, resulting in defects such as lack of glue or holes at the tip of the blade when it is finally completed. In addition, the existing composite blade mold is only designed with a fixed cavity, which will cause problems such as difficulty in demolding after curing. Utility Model Content

[0004] The purpose of the utility model is to solve the deficiencies of the prior art and to provide a fan blade processing mold which is not prone to defects such as glue shortage or holes at the blade tip and is easy to demould.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] The utility model provides a fan blade processing mold, comprising an upper mold and a lower mold which cooperate to form a blade molding cavity and a blade tip movable insert which is detachably connected to the lower mold, one end portion of the lower mold is recessed along the thickness direction of the blade tip to form a first insert groove, the blade tip movable insert is arranged on the first insert groove, the surface of the blade tip movable insert facing the blade tip matches the profile of the blade tip end, and the top of the blade tip movable insert is flush with the top of the blade tip.

[0007] In one embodiment, the upper surface of the lower mold is recessed with a prepreg groove, and the prepreg groove includes a blade groove and a petiole groove. The lower mold is also provided with a petiole movable insert and a petiole positioning block corresponding to the petiole groove. The upper surface of the lower mold is recessed with a second insert groove extending from the end of the petiole groove for placing the petiole movable insert. The lower surface of the upper mold is recessed with a third insert groove matching the petiole movable insert opposite to the second insert groove. The surface of the petiole movable insert facing the petiole is convexly provided with a molding portion for molding the tail section of the petiole. The bottom of the petiole positioning block is recessed to form a molding through hole matching the shape of the petiole. The petiole positioning block is placed above the petiole groove and the molding through hole cooperates with the petiole groove to locate a space for laying the petiole prepreg.

[0008] In one embodiment, the surface of the petiole movable insert facing away from the petiole is tightly fitted with the rear groove wall of the second insert groove through a preset draft angle.

[0009] In one embodiment, the petiole movable insert includes a first petiole insert provided with the forming portion and a second petiole insert flush with the first petiole insert along the length direction of the petiole, and the surface of the second petiole insert facing away from the first petiole insert is pressed against the rear groove wall of the second insert groove through a preset draft angle.

[0010] In one of the embodiments, a lifting screw hole for demoulding and lifting is provided on a side of the petiole movable insert facing the upper mold.

[0011] In one embodiment, a plurality of guide posts are connected to the outer side wall of the upper mold by bolts or pins, and a mold guide hole portion for the guide post to pass through is provided on the outer side wall of the lower mold corresponding to any of the guide posts.

[0012] In one embodiment, a blade tip glue overflow groove is formed on the surface of the blade tip movable insert facing the upper mold.

[0013] In one embodiment, the blade tip movable insert is fixed in the first insert groove by bolts or pins.

[0014] In one embodiment, two blade glue overflow grooves are formed on the upper surface of the lower mold along the length direction of the blade, and the two blade glue overflow grooves are respectively arranged on two sides of the cavity.

[0015] In one embodiment, a lifting hole for lifting is provided on the body of the upper mold and the body of the lower mold.

[0016] Compared with the prior art, the beneficial effect of the utility model is that a detachable blade tip movable insert is added, and the top of the blade tip movable insert is designed to be flush with the top of the blade tip, so that defects such as glue shortage or holes are not easily generated at the blade tip; at the same time, a detachable petiole movable insert is added, and the design of the blade tip movable insert and the petiole movable insert makes demolding more convenient, solving the problem of difficulty in demolding the blade after solidification. In addition, by arranging the guide column on the outside of the blade mold and adopting the design of two movable inserts at the petiole of the composite material, the problem of difficulty in demolding the composite material mold is further solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of an upper die in a fan blade processing die of the utility model;

[0018] Figure 2 This is a schematic structural diagram of a lower mold in a fan blade processing mold of the utility model;

[0019] Figure 3 for Figure 2 The schematic diagram of the structure of the assembly of the lower die, the tip movable insert, the petiole movable insert, and the petiole positioning block is shown;

[0020] Figure 4 for Figure 1 The schematic diagram of the structure of the movable insert at the blade tip is shown;

[0021] Figure 5 for Figure 1 The schematic diagram of the structure of the petiole movable insert shown;

[0022] Figure 6 for Figure 1 The structural schematic diagram of the petiole positioning block shown;

[0023] Figure 7 for Figure 3 A schematic diagram of the structure from another angle of the structure shown;

[0024] Figure 8 for Figure 7 The structure shown is a cross-sectional view along AA.

[0025] Explanation of the reference numerals: 1 upper mold, 11 third insert groove, 2 lower mold, 21 prepreg groove, 22 blade tip movable insert, 221 blade tip overflow groove, 23 first insert groove, 24 petiole movable insert, 241 molding part, 242 first petiole insert, 243 second petiole insert, 245 lifting screw hole, 25 petiole positioning block, 251 shaping through hole, 26 second insert groove, 27 draft angle, 31 guide column, 33 mold guide hole part, 35 blade overflow groove, 37 upper mold hanging hole, 39 lower mold hanging hole. DETAILED DESCRIPTION

[0026] Combined with reference Figure 1-8 The present embodiment provides a fan blade processing mold, including an upper mold 1, a lower mold 2 with a prepreg groove 21 recessed on the upper surface, and a blade tip movable insert 22, a petiole movable insert 24 and a petiole positioning block 25 arranged on the lower mold 2. The upper mold 1 cooperates with the lower mold 2 to form a blade molding cavity. The prepreg groove 21 includes a blade groove and a petiole groove. The composite material prepreg of the required number of layers is laid in the prepreg groove 21 of the lower mold 2. After laying, the prepreg is trimmed according to the edge of the mold, and vacuum pre-pressing is performed to prevent air from existing in the middle of the prepreg. After vacuuming, the mold is closed and sent to a press. The temperature, pressure and time are set, and the mold is pressed and cured. After curing, demolding and post-processing are performed to obtain a blade.

[0027] In this embodiment, one end of the lower mold 2 is recessed along the blade tip thickness direction to form a first insert groove 23, and the blade tip movable insert 22 is arranged on the first insert groove 23. The surface of the blade tip movable insert 22 facing the upper mold 1 is provided with a blade tip overflow groove 221. The surface of the blade tip movable insert 22 facing the blade tip matches the blade tip end profile and the top of the blade tip movable insert 22 is flush with the top of the blade tip. Therefore, the excess prepreg at the blade tip can be trimmed according to the surface of the blade tip movable insert 22 facing the blade tip to ensure that no gap will appear when the mold is pressed, and the laid prepreg can be completely compacted, avoiding the occurrence of a blade defect that the thickness of the entire blade body becomes thicker due to excessive prepreg. In addition, compared with the mold in the prior art where the parting surface at the blade tip is in the middle of the model, , the top of the blade tip movable insert 22 of the present embodiment is flush with the top of the blade tip, and the prepreg at the blade tip will no longer soften and flow out of the gap between the upper mold 1 and the lower mold 2 when the pressure temperature rises, resulting in glue shortage or hole defects at the blade tip. After the prepreg at the blade tip is softened by high temperature, it is still all in the lower mold 2, and will be pressed in the lower mold 2 after being compressed. During mold closing and curing, only a small amount of glue will overflow on the top of the blade tip movable insert 22, and defects such as glue shortage or holes are not easy to occur at the blade tip. This problem can be solved by grinding treatment of later machining, which effectively improves the molding quality of the blade tip. In addition, a blade tip movable insert 22 is added to the lower mold 2, and the blade tip movable insert 22 can be taken out first when demolding, so that the blade tip will not be stuck in the lower mold 2, which can facilitate demolding. In this embodiment, two screw holes are provided on the outer side of the blade tip movable insert 22 , and two bolts are screwed into the two screw holes of the blade tip movable insert 22 to fix the blade tip movable insert 22 to the end of the lower mold 2 .

[0028] In this embodiment, a petiole movable insert 24 and a petiole positioning block 25 are provided on the lower mold 2 corresponding to the petiole material groove, and a second insert groove 26 for placing the petiole movable insert 24 is recessed on the upper surface of the lower mold 2 extending from the end of the petiole material groove, and a third insert groove 11 matching the petiole movable insert 24 is recessed on the lower surface of the upper mold 1 opposite to the second insert groove 26, and a molding portion 241 for molding the tail section of the petiole is convexly provided on the surface of the petiole movable insert 24 facing the petiole, and the bottom of the petiole positioning block 25 is recessed to form a molding through hole 251 matching the shape of the petiole, and the petiole positioning block 25 is placed above the petiole material groove and the molding through hole 251 cooperates with the petiole material groove to locate a space for laying the petiole prepreg.

[0029] The petiole of the blade manufactured by the mold of this embodiment is made into two parts. First, a part of the petiole prepreg is laid in the molding part 241 of the petiole movable insert 24, and then the petiole movable insert 24 and the petiole positioning block 25 are placed on the lower mold 2. The petiole prepreg laying space is positioned according to the shaping through hole 251 and the petiole material groove of the prepreg groove 21, and then the remaining part of the petiole prepreg is laid. The petiole positioning block 25 is used to position and trim the prepreg at the petiole. After the prepreg is laid, the petiole positioning block 25 is taken down and then the mold is closed.

[0030] In this embodiment, the petiole movable insert 24 includes a first petiole insert 242 provided with a molding portion 241 and a second petiole insert 243 flush with the first petiole insert 242 along the length direction of the petiole. The surface of the second petiole insert 243 facing away from the petiole is pressed against the rear groove wall of the second insert groove 26, and the surface of the second petiole insert 243 facing away from the first petiole insert 242 is provided with a draft angle 27, and the rear groove wall of the second insert groove 26 is provided with a corresponding draft angle. The two are tightly fitted together through a preset draft angle, and a vertical downward pressure is applied during molding. The design of the draft angle enables the petiole to be subjected to left and right pressure when under pressure, which helps to better compact the prepreg at the petiole. In addition, the first petiole insert 242 and the second petiole insert 243 are provided with lifting screw holes 245 for demoulding and lifting on the side facing the upper mold 1. When demoulding, the first petiole insert 242 and the second petiole insert 243 can be lifted out first, so that the blade can be demoulded easily.

[0031] In this embodiment, a plurality of guide posts 31 are connected to the outer wall of the upper mold 1 by bolts or pins, and a mold guide hole 33 for the guide post 31 to pass through is provided on the outer wall of the lower mold 2 corresponding to any guide post 31. The existing mold is designed with built-in guide posts. If the guide posts are slightly deformed during molding, they will be stuck in the mold during demolding, making it difficult to demold. In this embodiment, the guide posts 31 and the mold guide holes 33 are arranged outside the mold. After changing to an external design, even if the guide posts 31 are deformed, they can be taken out manually without difficulty in demolding.

[0032] In this embodiment, high-strength steel is used to manufacture the mold to ensure that the mold can withstand the high-pressure and high-temperature use environment, and the mold cavity surface is consistent with the blade model surface to ensure that the surface accuracy of the composite material blade meets the design requirements. The upper surface of the lower mold 2 is provided with two blade overflow glue grooves 35 along the length direction of the blade. The two blade overflow glue grooves 35 are arranged on both sides of the cavity. When the mold is closed and cured, the excess resin glue can flow out of the lower mold 2 from the blade overflow glue grooves 35. The main body of the upper mold 1 is provided with a hanging hole 37 used for hanging the mold, and the main body of the lower mold 2 is provided with a hanging hole 39 used for hanging the mold, which serves as the bolt position for hanging the mold.

[0033] The fan blade processing mold manufacturing process of this embodiment is as follows: a blade tip movable insert 22 is arranged on the lower mold 2, and according to the design requirements, the composite material prepreg of the blade and petiole is laid in the prepreg groove 21 of the lower mold 2, wherein a part of the petiole prepreg is first laid in the forming part 241 of the petiole movable insert 24, and then the petiole movable insert 24 and the petiole positioning block 25 are placed on the lower mold 2, and the petiole prepreg laying space is positioned according to the shaping through hole 251 and the prepreg groove 21, and then the remaining part of the petiole prepreg is laid, and after the prepregs are all laid, the prepregs are trimmed according to the edge of the prepreg groove 21, and vacuum pre-pressed to prevent air from existing in the middle of the prepregs, and after vacuuming is completed, the mold is closed, and the upper mold 1 and the lower mold 2 are combined according to the guide column 31 and the closing guide hole part 33, and sent into the press, and the temperature, pressure and time are set, and the molding is cured, and demolding and post-processing are performed after the curing is completed to obtain the blade.

[0034] The fan blade processing mold of the utility model is provided with a detachable blade tip movable insert, and the top of the blade tip movable insert is designed to be flush with the top of the blade tip, so that defects such as lack of glue or holes are not easily generated at the blade tip; at the same time, a detachable petiole movable insert is added, and the design of the blade tip movable insert and the petiole movable insert makes demolding more convenient, solving the problem of difficulty in demolding the blade after solidification; in addition, the problem of difficulty in demolding the composite material mold is further solved by arranging the guide column on the outside of the blade mold and adopting the design of two movable inserts at the composite material petiole.

[0035] A person skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of protection of the present application is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0036] One or more embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the present application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of the present application should be included in the protection scope of the present application.

Claims

1. A fan blade processing mold, characterized in that: The invention comprises an upper die (1) and a lower die (2) which cooperate to form a blade forming cavity, and a blade tip movable insert (22) which is detachably connected to the lower die (2), one end of the lower die (2) is recessed along the thickness direction of the blade tip to form a first insert groove (23), the blade tip movable insert (22) is arranged on the first insert groove (23), the surface of the blade tip movable insert (22) facing the blade tip matches the profile of the blade tip end, and the top of the blade tip movable insert (22) is flush with the top of the blade tip.

2. The fan blade processing mold according to claim 1, characterized in that: The upper surface of the lower mold (2) is provided with a prepreg groove (21), the prepreg groove (21) comprising a blade groove and a petiole groove, the lower mold (2) is further provided with a petiole movable insert (24) and a petiole positioning block (25) corresponding to the petiole groove, the upper surface of the lower mold (2) is provided with a second insert groove (26) extending from the end of the petiole groove for accommodating the petiole movable insert (24), and the lower surface of the upper mold (1) is provided with a recessed A third insert groove (11) is provided to match the petiole movable insert (24); a molding portion (241) is convexly provided on the surface of the petiole movable insert (24) facing the petiole for molding the petiole tail section; the bottom of the petiole positioning block (25) is recessed to form a molding through hole (251) matching the shape of the petiole; the petiole positioning block (25) is placed above the petiole material groove and the molding through hole (251) cooperates with the petiole material groove to locate a space for laying the petiole prepreg.

3. The fan blade processing mold according to claim 2, characterized in that: The surface of the petiole movable insert (24) facing away from the petiole is tightly fitted with the rear groove wall of the second insert groove (26) at a preset draft angle.

4. The fan blade processing mold according to claim 2, characterized in that: The petiole movable insert (24) comprises a first petiole insert (242) provided with the forming portion (241) and a second petiole insert (243) flush with the first petiole insert (242) along the length direction of the petiole, wherein a surface of the second petiole insert (243) facing away from the first petiole insert (242) is pressed against a rear groove wall of the second insert groove (26) at a preset draft angle.

5. The fan blade processing mold according to claim 2, characterized in that: A lifting screw hole (245) for demoulding and lifting is provided on a side of the petiole movable insert (24) facing the upper mold (1).

6. The fan blade processing mold according to any one of claims 1 to 5, characterized in that: A plurality of guide posts (31) are connected to the outer side wall of the upper die (1) via bolts or pins, and a mold guide hole (33) for the guide post (31) to pass through is provided on the outer side wall of the lower die (2) corresponding to any of the guide posts (31).

7. The fan blade processing mold according to any one of claims 1 to 5, characterized in that: A blade tip glue overflow groove (221) is provided on the surface of the blade tip movable insert (22) facing the upper mold (1).

8. The fan blade processing mold according to any one of claims 1 to 5, characterized in that: The blade tip movable insert (22) is fixed in the first insert groove (23) by means of bolts or pins.

9. The fan blade processing mold according to any one of claims 1 to 5, characterized in that: Two blade glue overflow grooves (35) are provided on the upper surface of the lower mold (2) along the length direction of the blade, and the two blade glue overflow grooves (35) are respectively arranged on two sides of the mold cavity.

10. The fan blade processing mold according to any one of claims 1 to 5, characterized in that: Lifting holes for lifting are provided on the body of the upper mold (1) and the body of the lower mold (2).

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