Blade three-dimensional positioning model placenta and positioning method thereof

Abstract

The invention relates to the technical field of blade machining and assembly positioning, in particular to a blade three-dimensional positioning mold placenta and a positioning method.The mold placenta comprises a mold placenta body which is of a disc-shaped structure and used for bearing and positioning a blade, and the mold placenta body is provided with electrode holes through which an electrode welding head can pass when an upper folded edge of the blade is welded; the toothed centering disc is of a toothed structure and is located in the center of the mold plate body, the toothed centering disc is rotationally connected with the mold plate body through a driving device, the toothed centering disc is used for being matched with the vertex of the blade, and the toothed centering disc can be driven by the driving device to rotate to drive the blade to slightly rotate to adjust the angle of the blade; the two groups of first positioning pins are arranged at intervals along the molded surface of the mold placenta body and are used for being matched with the lower folded edge of the blade to limit the degree of freedom of the blade part; according to the invention, the positioning flexibility is realized, the trial-manufacture period is shortened, and the rejection rate is reduced.

Description

Technical Field

[0001] This invention relates to the field of blade processing and assembly positioning technology, specifically to a three-dimensional positioning mold for blades and its positioning method. Background Technology

[0002] During blade machining and assembly, the positioning accuracy of the mold plate directly affects the final form and position tolerances and assembly performance of the blade. Existing blade positioning technology mainly adopts the method of "mold plate surface fitting + 3 sets of positioning pin angle control + optical centering disk radial limit". The principle is to achieve initial support by fitting the mold plate surface with the blade curved surface, the 3 sets of positioning pins limit the rotation angle of the blade, and the optical centering disk (smooth cylindrical structure) achieves radial limit.

[0003] However, this existing technology has the following significant shortcomings: Poor positioning adjustment flexibility: When the theoretical calculation does not match the actual blade positioning requirements, the blade angle needs to be adjusted by re-drilling the positioning pin holes, resulting in repeated processing of the mold and low reusability. Long trial production cycle: Re-drilling pin holes requires multiple disassembly, measurement, and processing, which prolongs the blade trial production cycle, especially in the new product development stage, and seriously affects the progress of new product development. High scrap rate: The adjustment of the positioning pin hole is prone to interference with the electrode hole, causing the mold placenta to be scrapped; Therefore, it is necessary to design a three-dimensional blade positioning method based on a molded placenta to improve the above problems. Summary of the Invention

[0004] To address the problems of existing technologies, this invention provides a three-dimensional positioning model placenta for blades and its positioning method, comprising: The mold plate body has a disc-shaped structure and is used to support and position the blades; the mold plate body is provided with electrode holes for the electrode welding head to pass through during the upper edge welding of the blades; The toothed centering disc is located in the center of the mold plate body. The toothed centering disc is rotatably connected to the mold plate body through a drive device. It is used to engage with the blade tip and can drive the toothed centering disc to rotate, thereby causing the blade to rotate slightly to adjust the blade angle. Two sets of first locating pins are arranged at intervals along the surface of the mold plate body to engage with the lower folded edge of the blade and restrict the degree of freedom of the blade.

[0005] Furthermore, the toothed centering disk has several toothed structures evenly distributed around its outer circumference. These toothed structures cooperate with the blade apex to achieve multi-angle micro-adjustment to adapt to the blade positioning angle requirements.

[0006] Furthermore, the coaxiality of the toothed centering disc and the mold plate body is ≤0.02mm, which is used to ensure the radial positioning accuracy of the blade.

[0007] Furthermore, the molded plaque also includes a second positioning pin. The toothed centering disc and the molded plaque body are provided with corresponding through holes. The toothed centering disc and the molded plaque body are fixed by passing the second positioning pin through the through holes.

[0008] Furthermore, the minimum rotation adjustment angle of the toothed centering disk is ≤0.5°.

[0009] Furthermore, the dimensional tolerance of the two sets of first locating pins is IT6~IT7 grade, and the center distance tolerance of the two sets of first locating pins is ≤0.02mm.

[0010] A method for three-dimensional positioning of blades based on the molded placenta includes the following steps: Step 1: Fit the lower folded edge of the blade to the surface of the mold platen body and engage it with the two sets of first positioning pins to complete the initial positioning of the blade and restrict some of its degrees of freedom. Step 2: Align the apex of the blade with the toothed groove of the toothed centering disk to achieve preliminary constraint on the radial position and angle of the blade; Step 3: If the positioning performance does not meet the theoretical requirements, adjust the blade angle by micro-rotating the toothed centering disk until the positioning accuracy requirements are met; Step 4: Perform subsequent blade processing. The electrode welding head passes through the electrode hole of the mold plate body to complete the welding operation and achieve three-dimensional positioning of the blade.

[0011] Furthermore, before the subsequent processing of the blades in step four, the toothed centering disc and the mold plate body are fixed by the second positioning pin.

[0012] The beneficial effects of this invention are: This application comprises a mold plate body, two sets of first positioning pins, and a toothed centering disc. The toothed centering disc is installed at the center of the mold plate body and is rotatably connected to the mold plate body via a drive device. The outer circumference of the centering disc has several toothed structures that can precisely match the apex of the blade. By driving the centering disc to rotate slightly through the drive device, the blade angle can be adjusted to adapt to different positioning requirements. This solves the problems of poor positioning flexibility, long trial production cycle, high scrap rate, and difficulty in balancing accuracy in traditional blade positioning technology, achieving positioning flexibility, shortening the trial production cycle, and reducing the scrap rate. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the molded placenta of the present invention; Figure 2 This is a top view of the molded placenta of the present invention.

[0014] Figure label: In the diagram: 1-toothed centering disc, 2-mold platen body, 3-second positioning pin, 4-first positioning pin, 5-blade. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] Please see Figure 1-2 This invention provides a three-dimensional positioning mold placenta for blades, comprising: The mold plate body 2 has a disc-shaped structure and is used to support and position the blade 5; the mold plate body 2 is provided with electrode holes for the electrode welding head to pass through during the upper edge welding of the blade 5. The toothed centering disk 1 is located in the center of the mold plate body 2. The toothed centering disk 1 and the mold plate body 2 are rotatably connected by a drive device. The toothed centering disk 1 is used to cooperate with the tip of the blade 5. The toothed centering disk 1 can be driven to rotate by the drive device to drive the blade 5 to rotate slightly and adjust the angle of the blade 5. Two sets of first positioning pins 4 are arranged at intervals along the surface of the mold plate body 2 to engage with the lower folded edge of the blade 5 and restrict some degrees of freedom of the blade 5.

[0017] Furthermore, the toothed centering disk 1 has several toothed structures evenly distributed around its outer circumference. These toothed structures cooperate with the apex of the blade 5 to achieve multi-angle micro-adjustment, so as to adapt to the positioning angle requirements of the blade 5.

[0018] Furthermore, the coaxiality of the toothed centering disc 1 and the mold plate body 2 is ≤0.02mm, which is used to ensure the radial positioning accuracy of the blade 5.

[0019] Furthermore, the molded placenta also includes a second positioning pin 3. The toothed centering disc 1 and the molded placenta body 2 are provided with corresponding through holes. The toothed centering disc 1 and the molded placenta body 2 are fixed by passing the second positioning pin 3 through the through holes.

[0020] Furthermore, the minimum rotation adjustment angle of the toothed centering disk 1 is ≤0.5°.

[0021] Furthermore, the dimensional tolerances of the two sets of first locating pins 4 are IT6~IT7 grade, and the center distance tolerance of the two sets of first locating pins 4 is ≤0.02mm.

[0022] It should be noted that the mold plate body 2 has a disc-shaped structure and is used to support and position the blade 5. Electrode holes are provided on the mold plate body 2 to allow the electrode welding head to pass through during the upper edge welding of the blade. These electrode holes are specifically designed for upper edge welding of the blade 5, ensuring smooth passage of the electrode welding head and guaranteeing the normal progress of the welding operation. The minimum distance between the electrode holes, the first positioning pin mounting hole, and the second positioning pin through hole on the mold plate body 2 is ≥5mm to avoid mutual interference and structurally eliminate the risk of scrap due to interference.

[0023] The toothed centering disc 1 is a toothed structure located in the center of the mold platen body. The toothed centering disc is rotatably connected to the mold platen body 2 via a drive device. It is used for the toothed centering disc to engage with the blade tip, and the drive device can drive the toothed centering disc to rotate, thereby causing the blade to rotate slightly to adjust the blade angle. The toothed centering disc has several toothed structures evenly distributed on its outer circumference. The toothed structures are trapezoidal or triangular teeth with a tooth pitch of 0.5~1mm and a tooth depth of 2~3mm. They are adapted to the spherical or conical structure of the blade tip, and can realize multi-angle micro-adjustment to meet the blade positioning angle requirements. The coaxiality of the installation reference between the toothed centering disc and the mold platen body is ≤0.02mm to ensure the radial positioning accuracy of the blade. The minimum rotation adjustment angle of the toothed centering disc is ≤0.5°, which can realize fine angle adjustment.

[0024] Two sets of first locating pins 4 are arranged at intervals along the surface of the mold base 2. Their function is to cooperate with the lower folded edge of the blade 5, and to limit the degree of freedom of the blade 5 through contact limiting, providing initial positioning support for the blade 5. The dimensional tolerances of the two sets of first locating pins 4 are strictly controlled within IT6~IT7 grade, and the center distance tolerance is ≤0.02mm to ensure positioning accuracy.

[0025] Second locating pin 3: As an optional fixing component, the toothed centering disc 1 and the mold plate body 2 are provided with corresponding through holes. After the angle of the blade 5 is adjusted to meet the accuracy requirements, the second locating pin 3 is passed through the through hole to fix the toothed centering disc 1 and the mold plate body 2, thus preventing positioning misalignment during processing.

[0026] The drive device is either manually driven by a knob or driven by a micro servo motor. The drive device is fixed on the side of the mold plate body away from the blades, and its output end is connected to the center of the toothed centering plate to provide power for the rotation of the toothed centering plate, thereby enabling convenient adjustment of the blade angle.

[0027] A method for three-dimensional positioning of blades based on the molded placenta includes the following steps: Step 1: Fit the lower folded edge of blade 5 to the surface of molded placenta body 2 and engage with two sets of first positioning pins 4 to complete the initial positioning of blade 5 and restrict some of its degrees of freedom. Step 2: Align the vertex of blade 5 with the toothed groove of toothed centering disk 1 to achieve preliminary constraint on the radial position and angle of blade 5; Step 3: If the positioning performance does not meet the theoretical requirements, adjust the angle of blade 5 of the micro-rotating toothed centering disk 1 until the positioning accuracy requirements are met; Step 4: Perform subsequent processing of blade 5. The electrode welding head passes through the electrode hole of the mold plate body 2 to complete the welding operation and realize the three-dimensional positioning of blade 5.

[0028] Furthermore, before the subsequent processing of the blade 5 in step four, the toothed centering disc 1 and the mold plate body 2 are fixed by the second positioning pin 3.

[0029] It should be noted that, based on the above-mentioned three-dimensional positioning method for the blades of the molded placenta, in the initial positioning, the lower folded edge of the blade 5 is tightly fitted to the surface of the molded placenta body 2, while the lower folded edge of the blade 5 is engaged and contacted with the two sets of first positioning pins 4. Through surface fitting and positioning pin limiting, the initial positioning of the blade 5 is completed, effectively restricting some degrees of freedom of the blade 5, laying the foundation for subsequent positioning.

[0030] In the vertex positioning process, the vertex of blade 5 is precisely aligned with the toothed groove of toothed centering disk 1. Through the meshing of the toothed structure with the vertex, the radial position and angle of blade 5 are initially constrained, further improving the stability of positioning.

[0031] Angle fine-tuning: After completing the initial positioning and vertex positioning, check whether the positioning performance of blade 5 meets the theoretical requirements. If there is a deviation, drive the toothed centering disk 1 to rotate slightly, and use its toothed structure to adjust the angle of blade 5 until the positioning accuracy of blade 5 meets the preset requirements. The minimum rotation adjustment angle of the toothed centering disk 1 is ≤0.5°, which can achieve fine adjustment.

[0032] Fixing and subsequent processing: After the blade 5 angle is adjusted to the correct position, the second positioning pin 3 is passed through the corresponding through holes on the toothed centering plate 1 and the mold plate body 2 to fix their relative positions and prevent displacement during processing. Subsequently, subsequent processing operations such as edge welding on the blade 5 are performed. The electrode welding head passes through the electrode hole of the mold plate body 2 to complete the welding, ultimately achieving three-dimensional precise positioning of the blade 5.

[0033] It is worth noting that this application relates to the processing and assembly positioning of sheet metal blades 5 with centering discs and mold base plates; The positioning flexibility of the blade three-dimensional positioning mold is significantly improved. The toothed centering disc 1 can directly adjust the angle of the blade 5 by micro-rotation, without the need to re-drill positioning pin holes as in traditional technology. This greatly improves the reusability of the mold and makes it suitable for processing blades 5 of different specifications and positioning requirements.

[0034] Specifically, this application introduces a toothed centering disk 1, whose engagement with the vertex of blade 5 replaces the traditional combination of a smooth centering disk and a fixed positioning pin. Its evenly distributed toothed structure on the outer ring acts like a precise gear, providing discrete but accurate multiple gear positions for adjusting the angle of blade 5. When the angle of blade 5 needs adjustment, the operator only needs to slightly rotate the toothed centering disk 1 via the drive device to engage the vertex of blade 5 with different tooth grooves, thus quickly and conveniently changing the angle of blade 5.

[0035] The positioning flexibility is significantly improved. The adjustment process no longer requires any drilling or cutting on the mold base 2, avoiding permanent damage to the mold base. Angle adjustments can be completed in a short time without complex disassembly and reassembly procedures, greatly improving production preparation efficiency. The same mold base can be adapted to various angles and even different specifications of blades 5 by changing the toothed centering disc 1 or simply rotating the centering disc. This not only reduces the investment cost of special tooling but also reduces the pressure of tooling inventory, making it particularly suitable for multi-variety, small-batch production modes and frequent iteration R&D environments.

[0036] The trial production cycle is significantly shortened, eliminating the tedious process of repeated disassembly, measurement, and pin hole drilling in traditional technologies. This reduces processing steps and time costs, especially in the new product development stage, effectively accelerating the development process and shortening the product launch cycle; specifically, The scrap rate is significantly reduced, avoiding the risk of interference between the positioning pin holes and electrode holes caused by adjusting them, as is common in traditional technologies. This reduces the number of mold platen scraps and lowers production costs. Specifically, this application concentrates the angle adjustment function on a single component, the toothed centering disc 1, allowing key holes such as electrode holes on the mold platen body 2 to be fixed after design completion without any further modifications. The rotational adjustment of the toothed centering disc 1 is performed within its own range and is not directly related to other structures on the mold platen body 2, thus physically eliminating the possibility of interference between the adjustment operation and electrode holes. By protecting the high-value mold platen body 2 from the risk of scrap due to improper adjustment, this application significantly reduces production costs and risks, and improves the stability and economy of the production process. Every successfully avoided scrap is equivalent to saving the company a considerable amount of money and ensuring production continuity.

[0037] Stable and reliable positioning accuracy: The positioning method employs a combination of "two sets of first positioning pins 4 and toothed centering disc 1". By strictly controlling parameters such as the tolerance of the positioning pins and the coaxiality of the centering disc, the accuracy and stability of the three-dimensional positioning of the blade 5 are ensured, providing a strong guarantee for subsequent processing and assembly performance. Specifically, the cooperation between the two sets of high-precision first positioning pins 4 (dimensional tolerance of IT6~IT7 grade, center distance tolerance ≤0.02mm) and the lower folded edge of the blade 5 can accurately restrict the translation and some rotational degrees of freedom of the blade 5 on the horizontal plane, providing a stable reference for the blade 5. The toothed centering disc 1 not only provides an angle adjustment function, but its high coaxiality requirement (≤0.02mm) with the mounting reference of the mold plate body 2 also ensures the accurate positioning of the blade 5 in the radial direction. At the same time, its minimum rotation adjustment angle ≤0.5° design ensures the fineness of angle adjustment. The two positioning mechanisms, consisting of the two sets of first positioning pins 4 and the toothed centering disc 1, work together to construct a positioning system with high rigidity and high precision. The first locating pin 4 provides the primary constraint, while the toothed centering disc 1 provides precise angular and radial positioning and serves as a fine-tuning mechanism. This design ensures both positioning stability and the necessary adjustment flexibility.

[0038] This application comprises a mold plate body 2, two sets of first positioning pins 4, and a toothed centering disc 1. The mold plate body 2 has a disc-shaped structure and is provided with electrode holes for the electrode welding head to pass through during the welding of the upper folded edge of the blade 5. The two sets of first positioning pins 4 are arranged at intervals along the surface of the mold plate body 2 and are used to cooperate with the lower folded edge of the blade 5 to restrict some degrees of freedom of the blade 5. The toothed centering disc 1 is located in the center of the mold plate body 2 and is rotatably connected to the mold plate body 2 through a driving device. Several toothed structures are evenly distributed on its outer circumference. The toothed structures cooperate with the apex of the blade 5 and the angle of the blade 5 can be adjusted by micro-rotation. This solves the problems of poor positioning flexibility, long trial production cycle, high scrap rate, and difficulty in balancing accuracy in the traditional blade 5 positioning technology, and achieves positioning flexibility, shortens the trial production cycle, and reduces the scrap rate.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A three-dimensional positioning mould for blade moulding, c h a r a c t e r i s e d in that The utility model relates to a kind of moulding die plate and positioning method for blade, comprising: Moulding die plate body, in disc structure, for carrying and positioning blade, the moulding die plate body is equipped with electrode hole, for electrode welding head when upper folding edge welding of blade passes through; Toothed centering disc, in toothed structure, is located in the center of moulding die plate body, toothed centering disc is rotationally connected with moulding die plate body by driving device, for toothed centering disc and blade vertex cooperation, and can be driven by driving device to drive toothed centering disc rotation blade micro-rotary adjustment blade angle; Two groups of first positioning pins are arranged along the profile of the moulding die plate body, for cooperating with the lower folding edge of the blade, limiting the partial degrees of freedom of the blade.

2. The blade three-dimensional positioning mold board according to claim 1, wherein, The toothed centering disc is circumferentially distributed with a plurality of tooth-shaped structures outside, which cooperate with the vertex of the blade and can realize multi-angle fine adjustment to adapt to the positioning angle requirement of the blade.

3. The blade three-dimensional positioning mold board according to claim 1, wherein, The coaxiality of the mounting reference of the toothed centering disc and the moulding die plate body is ≤0.02mm, for ensuring the radial positioning accuracy of the blade.

4. The blade three-dimensional positioning mold board according to claim 1, wherein, The moulding die plate further comprises a second positioning pin, and the toothed centering disc and the moulding die plate body are provided with corresponding through holes, and the toothed centering disc and the moulding die plate body are fixed by the second positioning pin passing through the through holes.

5. The blade three-dimensional positioning mold board according to claim 1, wherein, The minimum rotational adjustment angle of the toothed centering disc is ≤0.5°.

6. The blade three-dimensional positioning mold board according to claim 1, wherein, The size tolerance of the two groups of first positioning pins is IT6~IT7 level, and the center distance tolerance of the two groups of first positioning pins is ≤0.02mm.

7. A method for three-dimensional positioning of the leaves of a mouldboard based on the mouldboard according to any one of claims 1 to 6, characterised in that, The method comprises the following steps: Step one: the lower folding edge of the blade is fitted to the profile of the moulding die plate body, and cooperates with the two groups of first positioning pins to complete the preliminary positioning of the blade, limiting its partial degrees of freedom; Step two: the vertex of the blade cooperates with the tooth groove of the toothed centering disc to realize the preliminary constraint of the radial position and angle of the blade; Step three: if the positioning performance does not meet the theoretical requirement, the toothed centering disc is micro-rotated to adjust the angle of the blade until the positioning accuracy requirement is met; Step four: subsequent processing of the blade is carried out, the electrode welding head passes through the electrode hole of the moulding die plate body to complete the welding operation, realizing the three-dimensional positioning of the blade.

8. A method for three-dimensional positioning of the leaves of a phytotron according to claim 7, characterized in that, Before the subsequent processing of the blade in step four, the toothed centering disc and the moulding die plate body are fixed by the second positioning pin.

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