A production mold for drone blades

Abstract

The invention discloses a manufacturing mold for a drone blade, comprising an upper mold, a lower mold and a positioning pin I; the lower mold cuts a block from the left reverse angle zero degree line position to the right on the front wall of the lower mold cavity corresponding to the trailing edge of the blade; the right end face of the block corresponds to the starting position of the arc transition at the end of the blade tip, and its lower end face is lower than the lowest point of the intersection line between the front wall of the lower mold cavity and the bottom surface of the lower mold cavity, the rear end face is the inner end face of the front wall of the lower mold cavity, and the front end face is not larger than the outer end face of the front wall of the lower mold cavity; the left and right ends of the upper end face of the lower mold block are respectively provided with symmetrical positioning pins I, and the lower end face of the upper mold is provided with a positioning hole I. After the mold is closed, the positioning pin I is located in the positioning hole I; the front and rear walls of the upper and lower mold blocks are evenly provided with fixing mechanisms, and after the mold is closed, the two are fixed together by the fixing mechanism. The invention is easy to manufacture, has low manufacturing cost, high manufacturing accuracy, and low scrap rate; the drone blades manufactured by the invention are easy to demould, have low manufacturing cost, and high blade quality.

Description

Technical Field

[0001] The invention belongs to the technical field of drone blade manufacturing and relates to a mold for manufacturing drone blades. Background Art

[0002] UAV is an emerging industry, widely used in military and civilian fields. The blades of UAV are the main moving parts that meet the power of UAV. With the development of my country's aviation industry, UAV has become one of the new development industries of aviation industry.

[0003] Generally, blades are made of molds. The blade mold is generally separated by the curved surface formed by the line connecting the maximum contour lines of the front and rear edges of the blade body, and is divided into upper molds and lower molds according to the placement position. Due to the high performance and fast rotation speed required for drones, the blades are sheet-like structures and the blade length is small, generally around 1-3 meters, so the blade body has a large twist angle. Since the thickness of the trailing edge of the blade is thin and the trailing edge boundary is a straight edge, this requires that the lower mold for making the blade has a reverse angle phenomenon on the end face of the mold cavity corresponding to the trailing edge of the blade, that is, the lower mold is inclined toward the outside of the mold cavity at the end close to the petiole corresponding to the trailing edge of the blade, and the angle with the horizontal plane of the mold cavity is greater than 90°, and the other end away from the petiole is inclined toward the inside of the mold cavity, and the angle with the horizontal plane of the mold cavity is less than 90°. The position with an angle of 90° with the horizontal plane of the mold cavity is the zero-degree line of the reverse angle. Due to the existence of the reverse angle phenomenon, the cavity of the lower mold is not easy to make, because the milling cutter is vertically downward, and the angle with the horizontal plane of the cavity is less than 90°. The general milling cutter cannot complete the milling, and the milling cutter needs to be placed at an angle. Therefore, a specially customized milling cutter is required for this process, which adds a huge cost to the production of the blades. The milling operation is very complicated and laborious, with poor accuracy and a very high scrap rate. Moreover, even if this lower mold is made, the finished blade cannot be removed from the mold due to the inclination of the side end face of the cavity. In addition, due to the large twist angle of the blade body, the reverse production error of the mold cavity is large and the accuracy is low. In short, it is basically impossible to use the existing concept of dividing the overall mold into upper and lower molds to make drone blades.

[0004] In addition, the blades of drones have a large twist angle, and the end face of the blade petiole is equipped with an eccentric positioning pin structure to adjust the blade angle. The positioning pin is mechanically formed with the positioning sleeve, and the molding process is complicated. The blade body mold is integrated with the petiole during molding; during mold molding, the blade positioning is mechanically processed, and the angular positioning deviation is large. The angle error of the blade mold is large after molding. Then the positioning sleeve with the positioning pin is fixed to the end face of the petiole. It is even more difficult to ensure the consistency of the installation angle between the blade body and the positioning pin, which leads to poor consistency between the angle of the blade positioning pin and the blade body, and it is difficult to ensure the balance and safety of high-speed rotating blades. Summary of the invention

[0005] The purpose of the present invention is to solve the above-mentioned problems existing in the prior art and to provide a mold for making drone blades. The mold is easy to manufacture, has low manufacturing cost, high manufacturing precision and low scrap rate. The drone blades made therefrom are easy to demould, have low manufacturing cost, high manufacturing precision, high blade quality and low scrap rate.

[0006] To achieve the above-mentioned purpose, the technical solution of the present invention is: a mold for making drone blades, including an upper mold, a lower mold and a positioning pin I; the mold whose mold cavity completely matches the blade body is divided into an upper mold and a lower mold on the curved surface formed by the line connecting the maximum contour lines of the front and rear edges of the blade body, and the mold cavity is divided into an upper mold cavity and a lower mold cavity; the upper mold and the lower mold are provided with a semicircular accommodating groove for the petiole on the end wall at one end of the petiole, that is, on the left wall of the upper and lower mold cavities; the lower mold cuts out blocks from the left reverse angle zero degree line position to the right on the end wall of the lower mold cavity corresponding to the trailing edge of the blade, that is, on the front wall of the lower mold cavity, and the lower mold is composed of a lower mold block and a removable fixed on the upper end face of the lower mold block. The block is composed of a cut piece; the right end face of the cut piece corresponds to the starting position of the arc transition at the end of the blade tip, the lower end face is lower than the lowest point of the boundary line between the front wall of the lower mold cavity and the bottom surface of the lower mold cavity, and is higher than the bottom surface of the lower mold block, the rear end face is the inner end face of the front wall of the lower mold cavity, and the front end face is not larger than the outer end face of the front wall of the lower mold cavity; the left and right ends of the upper end face of the lower mold block are respectively provided with symmetrical positioning pins Ⅰ, and the corresponding position of the lower end face of the upper mold is provided with a positioning hole Ⅰ, and after the mold is closed, the positioning pin Ⅰ is located in the positioning hole Ⅰ; the front and rear walls of the upper and lower mold blocks are respectively evenly provided with fixing mechanisms, and after the mold is closed, the two are fixed together by the fixing mechanisms.

[0007] Further preferably, the structure in which the cut block is detachably fixed to the upper end face of the lower mold block is: the upper end face of the lower mold block is evenly provided with a plurality of bolt holes I and two symmetrical positioning holes III at the position where the cut block is located; a plurality of bolt countersunk holes are evenly provided at the corresponding positions on the cut block and positioning pins III matching the two positioning holes III are provided; the cut block and the lower mold block are positioned by the positioning pins III and fixed together by bolts III. The positioning and installation are convenient and the fixing structure is simple.

[0008] Further preferably, the fixing mechanism includes an angled plate lifting module fixed on the front or rear wall of the upper mold by screws and an angled plate pressure block fixed on the front or rear wall of the lower mold block by screws; a threaded hole matching the long bolt is opened on the upper wall of the lifting module, and a light hole matching the long bolt is opened on the upper wall of the pressure block; the lifting module and the pressure block are fixed together by long bolts and nuts I connected in the threaded holes and light holes. This structure does not affect the setting of other structures of the upper mold and the lower mold block, and the structure is simple. When the bolts I and nuts I fix the lifting module and the pressure block together, the upper mold and the lower mold are fixed together, the bolts are disengaged from the nuts, and the upper mold and the lower mold are no longer fixed. The bolts are screwed up and then screwed down. Since the bolts are threadedly connected to the lifting module, the upper mold will be separated from the lower mold and demolded.

[0009] Further preferably, a positioning sleeve I is installed in the positioning hole I of the upper mold. The positioning sleeve I is a wear-resistant part, which avoids mutual wear between the positioning pin I and the positioning hole I when the upper and lower molds are closed, thereby increasing the service life, and the positioning sleeve I is easy to replace after being worn.

[0010] Further preferably, the left walls of the upper and lower mold cavities of the upper and lower mold blocks extend to the left end to form the left walls of the upper and lower molds, and a mounting groove for the blade positioning sleeve is left between the right end surface of the left wall of the lower mold and the left end surface of the left wall of the lower mold cavity, and a U-shaped positioning groove whose lower end is completely matched with the blade positioning pin is opened on the left wall of the lower mold; a positioning sleeve accommodating groove is opened at the position where the left wall of the upper mold matches the blade positioning sleeve. When making the blade body, the blade positioning sleeve with the positioning pin is first installed on the petiole, and then placed together in the lower mold cavity to make the blade body, and finally the upper mold is closed and hot-pressed. Due to the positioning function of the positioning pin, the mechanical processing structure for blade positioning during mold forming is cancelled, and the positioning pin is directly used for positioning, which can more accurately grasp the twisting angle of the blade body, ensure the accuracy of the installation position of the blade body and the positioning pin and the consistency of the deflection angle, ensure the balance and safety of the high-speed rotating blade, and improve the quality of the blade.

[0011] The mold of the present invention divides the lower mold into a lower mold block and a cut block, and the lower mold block and the cut block are machined separately. As long as the mold cavity of the cut block is facing each other, it can be milled with an ordinary milling cutter like the upper mold and the lower mold block, without customizing special tools, and the mold processing operation is simple, with high precision and low scrap rate, saving the processing cost of the mold. The cut block after milling is fixed to the lower mold block to form a complete lower mold. Due to the convenient operation and high manufacturing precision, it does not affect the accuracy of the entire mold cavity of the mold at all, ensuring the accuracy of blade manufacturing, and after the blade is manufactured, after the upper mold is removed, as long as the cut block is removed from the lower mold block, the blade can be removed from the lower mold, so even if there is a reverse angle in the mold cavity, it does not affect the production of the blade, the blade is of high quality, the scrap rate is low, and the manufacturing cost is low. In particular, the fixing mechanism adopts the demolding module on the upper mold and the pressure block on the lower mold block, which is more convenient for demolding the upper mold. There is also a mold with a blade positioning sleeve and a blade positioning pin installation structure, which can make the deflection angle of the blade more accurate and ensure the installation and service life of the blade during flight. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a partial sectional front view of the mold of the present invention;

[0013] Figure 2 It is a left side view of the mold of the present invention;

[0014] Figure 3 It is a right side view of the mold of the present invention;

[0015] Figure 4A top view of the lower mold with blades installed in the present invention;

[0016] Figure 5 It is the front view of the upper mold in the present invention;

[0017] Figure 6 A top view of the upper mold in the present invention;

[0018] Figure 7 It is a left side view of the upper die in the present invention;

[0019] Figure 8 It is a right side view of the upper die in the present invention;

[0020] Fig. 9 for Figure 6 AA section view;

[0021] Fig.10 It is the front view of the lower mold block in the present invention;

[0022] Fig.11 It is a top view of the lower mold block in the present invention;

[0023] Fig.12 It is a left view of the lower mold block in the present invention;

[0024] Fig.13 It is a right view of the lower mold block in the present invention;

[0025] Fig.14 for Fig.11 BB cross-section diagram;

[0026] Fig.15 It is the front view of the cut block in the present invention;

[0027] Fig.16 A top view of the cut block in the present invention;

[0028] Fig.17 It is a left side view of the cut block in the present invention;

[0029] Fig.18 It is a right side view of the cut block in the present invention;

[0030] Fig.19 for Fig.15 CC cross-section diagram. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0032] like Figures 1 to 19As shown, this embodiment includes an upper mold 1, a lower mold and a positioning pin Ⅰ6. The mold whose mold cavity completely matches the blade body 16 is divided into an upper mold 1 and a lower mold on the curved surface formed by the line connecting the maximum contour lines 24 of the front and rear edges of the blade body 16, and the mold cavity is divided into an upper mold cavity 28 and a lower mold cavity 30. The upper mold 1 and the lower mold have semicircular accommodating grooves 35 and 33 for the petiole 15 on the end wall at one end of the petiole 15, that is, the upper and lower mold cavity left walls 29 and 31. The lower mold cuts a block 9 from the left reverse angle zero line 27 to the right on the lower mold cavity end wall corresponding to the trailing edge of the blade, that is, the lower mold cavity front wall 36. The lower mold consists of a lower mold block 5 and a block 9 detachably fixed to the upper end surface of the lower mold block 5. Its preferred structure is: the upper end surface of the lower mold block 5 is evenly opened with 4 bolt holes Ⅰ18 and two symmetrical positioning holes Ⅲ19 at the position where the block 9 is located; 4 bolt countersunk holes 38 and positioning pins Ⅲ10 matching the two positioning holes Ⅲ19 are evenly opened at the corresponding positions on the block 9; the block 9 and the lower mold block 5 are positioned by the positioning pins Ⅲ10 and fixed together by bolts Ⅲ8. 34 is a block receiving groove for the block 9 opened on the lower mold block 5. The right end face 39 of the cut block 9 corresponds to the starting position 26 of the arc transition at the end of the blade tip 25 of the blade body 16. Its lower end face 32 is lower than the lowest point of the intersection line between the front wall 36 of the lower mold cavity and the bottom surface of the lower mold cavity, and higher than the bottom surface of the lower mold block 5. Its rear end face is the inner end face of the front wall 36 of the lower mold cavity, and its front end face 40 is not larger than the outer end face of the front wall 36 of the lower mold cavity. 41 is the reverse angle profile of the cut block 9. The left and right ends of the upper end face of the lower mold block 5 are respectively provided with symmetrical positioning pins Ⅰ6, and the corresponding positions of the lower end face of the upper mold 1 are provided with positioning holes Ⅰ. After the mold is closed, the positioning pins Ⅰ6 are located in the positioning holes Ⅰ. Preferably, a positioning sleeve Ⅰ7 is installed in the positioning hole Ⅰ of the upper mold 1. Fixing mechanisms are evenly arranged on the front and rear walls of the upper mold 1 and the lower mold block 5, respectively. After the mold is closed, the two are fixed together by the fixing mechanisms. Preferably, the fixing mechanism includes an angular plate lifting module 2 fixed to the front or rear wall of the upper mold 1 by screws 22 and an angular plate pressure block 11 fixed to the front or rear wall of the lower mold block 5 by screws 22; a threaded hole matching the long bolt 3 is opened on the upper wall of the lifting module 2, and a light hole connecting with the threaded hole on the upper wall of the lifting module 2 and matching with the long bolt 3 is opened on the upper wall of the pressure block 11; the lifting module 2 and the pressure block 11 are fixed together by the long bolt 3 and the nut Ⅰ20 connected in the threaded hole and the light hole.

[0033] Preferably, the left walls 29 and 31 of the upper and lower mold cavities of the upper mold 1 and the lower mold block 5 extend to the left end to form the left walls 29 and 17 of the upper and lower molds (the left wall 29 of the upper mold cavity is the same wall as the left wall 29 of the upper mold cavity), and a mounting groove 37 of the blade positioning sleeve 13 is reserved between the right end surface of the left wall 17 of the lower mold and the left end surface of the left wall 31 of the lower mold cavity, and a U-shaped positioning groove 21 whose lower end is completely matched with the blade positioning pin 14 is opened on the left wall 17 of the lower mold. A positioning sleeve accommodating through groove 23 is opened at the position where the left wall 29 of the upper mold matches the blade positioning sleeve 13. When making the blade body 16, the blade positioning sleeve 13 with the positioning pin 14 is first installed on the petiole 15 through the bolt 12, and then placed together in the lower mold cavity 28 to make the blade body 16, and finally the upper mold 1 is closed and hot-pressed.

[0034] Of course, the present invention has many other embodiments. Without violating the spirit and essence of the present invention, technicians familiar with the field can make corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should be regarded as improvements of equivalent technologies and belong to the protection scope of the claims of the present invention.

Claims

1. A mold for making a drone blade, characterized by: The invention comprises an upper die, a lower die and a positioning pin I; the die whose cavity is completely matched with the blade body is divided into an upper die and a lower die on the curved surface formed by the line connecting the maximum contour lines of the front and rear edges of the blade body, and the die cavity is divided into an upper die cavity and a lower die cavity; the upper die and the lower die are provided with a semicircular accommodating groove for the petiole on the end wall at one end of the petiole, i.e., on the left wall of the upper and lower cavities; the lower die is divided into a block from the position of the zero degree line of the left reverse angle to the right on the end wall of the lower die cavity corresponding to the rear edge of the blade, i.e., on the front wall of the lower die cavity, and the lower die is composed of a lower die block and a block detachably fixed on the upper end face of the lower die block; the right end face of the block is connected to the tip of the blade body. The starting position of the end arc transition corresponds to the lower end face, and its lower end face is lower than the lowest point of the intersection line between the front wall of the lower mold cavity and the bottom surface of the lower mold cavity, and is higher than the bottom surface of the lower mold block. Its rear end face is the inner end face of the front wall of the lower mold cavity, and its front end face is not larger than the outer end face of the front wall of the lower mold cavity; the left and right ends of the upper end face of the lower mold block are respectively provided with symmetrical positioning pins Ⅰ, and the corresponding position of the lower end face of the upper mold is provided with positioning hole Ⅰ. After the mold is closed, the positioning pin Ⅰ is located in the positioning hole Ⅰ; fixing mechanisms are evenly arranged on the front and rear walls of the upper and lower mold blocks, and after the mold is closed, the two are fixed together by the fixing mechanisms.

2. The mold for making a drone blade according to claim 1, characterized in that: The left walls of the upper and lower mold cavities of the upper and lower mold blocks extend to the left end to form the left walls of the upper and lower molds, and an installation groove for the blade positioning sleeve is left between the right end surface of the left wall of the lower mold and the left end surface of the left wall of the lower mold cavity, and a U-shaped positioning groove whose lower end is completely matched with the blade positioning pin is opened on the left wall of the lower mold; a positioning sleeve accommodating groove is opened at the position where the left wall of the upper mold matches the blade positioning sleeve.

3. The mold for making a drone blade according to claim 1 or 2, characterized in that: The structure in which the cut block is detachably fixed to the upper end surface of the lower mold block is: the upper end surface of the lower mold block is evenly provided with a plurality of bolt holes I and two symmetrical positioning holes III at the position where the cut block is located; a plurality of bolt countersunk holes are evenly provided at corresponding positions on the cut block and positioning pins III matching the two positioning holes III are provided; the cut block and the lower mold block are positioned by the positioning pins III and fixed together by bolts III.

4. The mold for making a drone blade according to claim 3, characterized in that: The fixing mechanism includes an angular plate lifting module fixed to the front or rear wall of the upper mold by screws and an angular plate pressure block fixed to the front or rear wall of the lower mold block by screws; a threaded hole matching the long bolt is opened on the upper wall of the lifting module, and a light hole connecting with the threaded hole on the upper wall of the lifting module and matching the long bolt is opened on the upper wall of the pressure block; the lifting module and the pressure block are fixed together by long bolts and nuts I connected in the threaded holes and the light holes.

5. The mold for making a drone blade according to claim 4, characterized in that: A positioning sleeve I is installed in the positioning hole I of the upper die.

6. The mold for making a drone blade according to claim 1 or 2, characterized in that: The fixing mechanism includes an angular plate lifting module fixed to the front or rear wall of the upper mold by screws and an angular plate pressure block fixed to the front or rear wall of the lower mold block by screws; a threaded hole matching the long bolt is opened on the upper wall of the lifting module, and a light hole connecting with the threaded hole on the upper wall of the lifting module and matching the long bolt is opened on the upper wall of the pressure block; the lifting module and the pressure block are fixed together by long bolts and nuts I connected in the threaded holes and the light holes.

7. The mold for making a drone blade according to claim 6, characterized in that: A positioning sleeve I is installed in the positioning hole I of the upper die.

8. The mold for making a drone blade according to claim 3, characterized in that: A positioning sleeve I is installed in the positioning hole I of the upper die.

9. The mold for making a drone blade according to claim 1 or 2, characterized in that: A positioning sleeve I is installed in the positioning hole I of the upper die.

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