CN112476576A - Design and cutting method for blunt tail core material of wind power blade - Google Patents
Design and cutting method for blunt tail core material of wind power blade Download PDFInfo
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- CN112476576A CN112476576A CN202011153573.XA CN202011153573A CN112476576A CN 112476576 A CN112476576 A CN 112476576A CN 202011153573 A CN202011153573 A CN 202011153573A CN 112476576 A CN112476576 A CN 112476576A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
- B26D3/06—Grooving involving removal of material from the surface of the work
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/08—Blades for rotors, stators, fans, turbines or the like, e.g. screw propellers
- B29L2031/082—Blades, e.g. for helicopters
- B29L2031/085—Wind turbine blades
Abstract
The invention relates to a design and cutting method of a blunt tail core material of a wind power blade, which comprises the following steps: the flat plate raw material is cut into trapezoidal unit blocks, and then the trapezoidal unit blocks are spliced into the blunt trailing edge core material of the wind power blade. The splicing mode is closer to the arc-shaped contour of the blunt trailing edge core material, and has good operability; the sandwich size is accurately matched, gaps do not need to be filled, and the weight is reduced; the splicing time is shortened, and the production efficiency is improved; the quality problem caused by overlarge clearance of the blunt trailing edge core material can be effectively solved, and the quality of the wind power blade is ensured.
Description
Technical Field
The invention relates to the technical field of wind power blade manufacturing, in particular to a design and cutting method for a blunt tail core material of a wind power blade.
Background
With the promotion of national policies of energy conservation and emission reduction, green and environment-friendly energy is a key development direction, and wind energy has the advantages of low energy consumption, environmental protection and large reserves, and becomes an energy source for key development at home and abroad. The wind turbine is a device for converting wind energy into electric energy, and the blade is one of the core components of the wind turbine; with the development of the blade industry, the light weight is the trend of blade development, and the core material is one of the main materials of the blade and is the key of the light weight of the blade; at present, the gap of a core material in the blade industry is generally required to be less than 5mm, the core material is paved in a splicing mode, if the gap of the core material is out of tolerance, rich resin is formed in the gap of the core material, the weight of the blade is increased (resin density is 1200kg/m for thin film, core material (BALSA) is 150kg/m for thin film) and the structural performance of the blade is influenced.
In the design of the blade, the blunt trailing edge design becomes a new favorite of the current blade design due to the good structural characteristics and aerodynamic characteristics of the blunt trailing edge design; the blunt trailing edge corner is large in angle (the maximum position is close to 80 degrees), the sandwich thickness is large (basically more than 35 mm), the conventional core material processing mode is generally flat plate block processing, the separation groove is of a straight-through type, so that a V-shaped gap is naturally formed after the core material at the blunt trailing edge corner (curved surface) is laid, the difficulty of identification from the inner surface is high, the gap of the outer surface is larger, the gap at the maximum position is close to 10mm, and the gap exceeds 5mm required by the industry by nearly one time. In order to solve the problem of overlarge gap between the outer surfaces of the sandwich cores at the blunt trailing edge, the mode of filling the same core material or glass fiber yarns is generally adopted in the wind power industry at present, but the operation difficulty is higher, the consumed time is longer, and the hidden quality trouble exists.
Through patent retrieval, the following patents mainly exist, which have a certain relationship with the invention:
1. the invention discloses a method for laying a wind power blade web core material, which is disclosed by Chinese invention patents with the application number of 201510051172.6, the application date of 2015.01.30, the publication number of CN104552993A and the publication number of 2015.04.29, wherein the Chinese invention patents are named as a method for laying a wind power blade web core material and the application name of Dishei wind power blade Dafeng Co., Ltd, and the method comprises the following steps: a: dividing the web plate core into rectangular core blocks according to the size of the mold, respectively marking a pair of side edges of the rectangular core blocks as L and H, and dividing the rectangular core blocks into a first division block and a second division block; b: the L side of the first divided block is tightly attached to a flange on the left side of the mold, and the H side of the second divided block is correspondingly placed in an inverted V shape in a manner of tightly attaching to a flange on the right side of the mold; c: placing a wood block on the joint of the two dividing blocks and tapping until the two dividing blocks are completely tiled on the same horizontal plane; d: respectively placing wood blocks at the side edge positions of the two partition blocks close to the mould flange and flicking the wood blocks until the two partition blocks are tightly attached to the whole mould, namely finishing the laying of the wind power blade web core material; the invention can avoid the wrinkles of the glass cloth on the lower surface in the laying process, has simple and quick laying operation, ensures the smoothness of the glass cloth and ensures the performance of the product.
2. The invention discloses a method for adjusting the die closing gap of the trailing edge of a wind power blade, which is a Chinese invention patent with the application number of 201811540641.0, the application date of 2018.12.17, the publication number of CN109483917A and the publication number of 2019.03.19, the name of application of a rigid foam in adjusting the die closing gap of the trailing edge of the wind power blade and the application name of Ming Yang wisdom energy group corporation, and the invention discloses an application of a rigid foam in adjusting the die closing gap of the trailing edge of the wind power blade, and the section shape of the rigid foam is confirmed and processed through three-dimensional simulation and actual verification according to the designed trailing edge UD of the blade, the structural size of a shell core material and the section of; after the outer skin is laid on the blade shell, before the blade trailing edge UD is laid, the rigid foam is laid on the blade trailing edge at a designed rigid foam laying position, and then the blade trailing edge UD is laid on the rigid foam, namely the rigid foam is laid below the blade trailing edge UD on the outer skin, so that the wind power blade trailing edge mold closing gap is adjusted and optimized, the thickness guarantee of the bonding glue on the bonding surface of the blade trailing edge during subsequent pouring is facilitated, the bonding performance and the quality are improved, the coated glass fibers required during the surface adjustment of the blade trailing edge upper surface are saved, the continuous felt with the lower surface of the blade trailing edge UD quickened in glue running speed is saved, the weight of the blade is reduced, and the risks of gas collection and resin accumulation of the continuous felt are.
3. The invention discloses a method for designing a filling core material at the trailing edge of a wind power blade, which is disclosed by Chinese invention patents with the application number of '202010527599. X', the application date of '2020.06.11', the publication number of 'CN 111561419A', the publication date of '2020.08.21', the name of 'a method for designing the filling core material at the trailing edge of the wind power blade', and the application number of 'national electric power integration technology (insurance) limited company', and the invention comprises the following steps: manufacturing an SS surface shell, a PS surface shell and a glue baffle plate, arranging a plurality of layers of glass fiber cloth on an adhesive surface of a rear edge die assembly clearance out-of-tolerance area of the PS surface shell, and carrying out wet bag pressing treatment; setting isolation films on the rear edges of the SS surface shell and the PS surface shell; turning over the blade mould, and suspending the PS surface shell above the SS surface shell in parallel; spraying foaming foam to the rear edge area of the blade along the die closing seam of the rear edge of the blade, filling the foaming foam in the cavity of the bonding area, and closing and locking the die; opening the mould after foaming to form a foaming foam blank, and shaping the foaming foam blank to form the required foaming foam; drawing three-dimensional coordinates of each part of the foaming foam, obtaining a two-dimensional size chart or a three-dimensional graph of each section, and adjusting the shape of the foaming foam. The invention designs a proper filling core material, and adjusts the mold closing gap of the blade trailing edge part area.
4. The invention provides a blunt trailing edge fan blade, which is disclosed as Chinese invention patents with the application number of 201410069466.7, the application date of 2014.02.27, the publication number of CN 103850889B and the publication date of 2016.08.17, namely a blunt trailing edge fan blade and a trailing edge elevation core material fixing method thereof and applied as Beijing gold wind scientific wind power equipment Limited company. The invention also provides a method for fixing the core material of the trailing edge vertical surface of the blunt trailing edge fan blade. According to the blunt trailing edge fan blade provided by the embodiment of the invention, the core material is laid neatly, the core material in the resin-rich area caused by core material displacement is prevented from being laid smoothly at the blunt trailing edge corner, the distance between the edge of the core material and the edge of a mold is well controlled, and the condition that the core material quality is out of tolerance due to overlarge caused by the core material sliding down is avoided.
5. The utility model discloses a utility model patent that application number is "201922036164.0", application date is "2019.11.22", publication number is "CN 211031289U", publication date is "2020.07.17", the name is "wind-powered electricity generation blade trailing edge facade regional filling structure", the applicant is "national electricity federation power technology (baoding) limited company", this utility model discloses a wind-powered electricity generation blade trailing edge facade regional filling structure relates to a filling structure, including PVC cushion and coating, filling structure is located the outside of wind-powered electricity generation blade casing outer skin, can select unilateral or two side fillings according to actual demand. Compared with the prior art, the utility model has the advantages that: (1) structural design is simple reasonable, the simple operation, and production efficiency is high. (2) The phenomenon that the glass fiber cloth is suspended at the position when the blades are paved in a layered mode is avoided, so that the defect of rich resin is overcome, and the quality of the blades is improved. (3) The mold closing gap of the vertical surface area of the trailing edge of the blade can be effectively adjusted, the problem of thickness over-tolerance of the area is solved, and the bonding strength is improved. (4) The amount of mold closing glue is reduced, the weight of the blade is reduced, the pneumatic performance of the trailing edge of the blade is improved, the strength of the blade is increased, and the service life of the blade is prolonged.
None of the above patents addresses the problem of excessive clearance between the outer surface of the core at the blunt trailing edge.
Therefore, the design of a proper blunt trailing edge core material is important for solving the problem of gap tolerance of the blunt trailing edge core material, and the difficulty lies in how to accurately determine the overall dimension of the blunt trailing edge core material.
Disclosure of Invention
The technical problem to be solved by the invention is to determine the overall dimension of the core material by researching and designing a core material processing mode matched with a blunt trailing edge corner (curved surface) so as to solve the problem of V-shaped gap quality of the blunt trailing edge of the blade aiming at the defects in the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a design method of a blunt tail core material of a wind power blade comprises the following steps: the flat plate raw material is cut into trapezoidal unit blocks, and then the N trapezoidal unit blocks are spliced into the wind power blade blunt trailing edge core material.
Furthermore, the flat plate raw material is cut in a V-shaped grooving mode, so that the trapezoid unit blocks are obtained. The design method of the blunt tail core material of the wind power blade can effectively solve the quality problem caused by overlarge gap of the blunt tail edge core material, does not need to fill the gap, reduces the weight, shortens the splicing time, improves the production efficiency and ensures the quality of the wind power blade.
Further, unfolding the arc-shaped part of the blunt trailing edge core material profile into a flat plate, dividing the flat plate into N equal parts, and dividing the arc length difference into N-1 equal parts according to the arc length difference between the outer ring arc length of the arc-shaped part of the trailing edge core material and the inner ring arc length of the arc-shaped part to obtain the width of the V-shaped cutting groove. By dividing the flat plates into a proper number, the trapezoidal unit blocks are more close to the arc-shaped outline of the blunt trailing edge core material after being spliced, and the size of the gap is further reduced so as to meet the technical requirements.
Further, selecting the length of the flat plate raw material to be equal to the outer ring arc length of the arc-shaped part of the blunt tail edge core material, drawing N-1 bisectors on one side surface of the flat plate raw material, respectively drawing cutting lines with the interval of V-shaped cutting groove width on the same-direction side of each bisector, cutting the V-shaped cutting grooves along the cutting lines to the other side of the flat plate raw material, and cutting the flat plate raw material into the trapezoid unit blocks. The gap of the blunt tail edge core material obtained by splicing the trapezoid unit blocks is smaller than that of the rectangular unit blocks, and the gap does not need to be filled.
Furthermore, cutting lines are respectively marked on the same side of each bisector and at positions with the interval of the width of the V-shaped cutting groove. The method is simple in scribing and cutting, and the obtained trapezoid unit block is in a right-angle trapezoid shape.
Furthermore, two cutting lines are respectively marked on two sides of each bisector, and the distance between the two cutting lines is the width of the V-shaped cutting groove. The trapezoid unit blocks obtained in the mode are in an equilateral trapezoid shape, and splicing gaps are smaller.
The invention also relates to a wind power blade blunt tail core material cutting method, which comprises the following steps:
the method comprises the following steps: drawing a profile diagram of the core material with the blunt trailing edge;
step two: selecting a flat plate raw material with the same thickness according to the thickness of the blunt trailing edge core material, and cutting the flat plate raw material according to the arc length of the outer ring of the shape part of the blunt trailing edge core material;
step three: dividing the arc length difference into N-1 equal parts according to the arc length difference between the outer ring arc length of the tail edge core material shape part and the inner ring arc length of the shape part to obtain the width of the V-shaped cutting groove, and drawing N-1 equal division lines on one side surface of the flat plate raw material;
step four: cutting lines with the V-shaped cutting groove width are respectively scribed at the position of each bisector;
step five: carrying out V-shaped grooving on the flat plate raw material along the cutting line, and cutting the flat plate raw material into trapezoid unit blocks;
step six: and placing the trapezoidal unit blocks into a wind power blade mould, and splicing into a blunt trailing edge core material.
Further, a flat plate stock is V-notched using an electric saw.
Furthermore, V-shaped grooving is carried out on the flat plate raw material by utilizing a V-shaped planing tool in a planing mode.
Further, V-shaped grooving is carried out on the flat plate raw material by utilizing a V-shaped milling cutter in a milling mode
The invention has the beneficial effects that: the flat plate raw material is cut into trapezoidal unit blocks, and then the trapezoidal unit blocks are spliced into the blunt trailing edge core material of the wind power blade. The splicing mode is closer to the arc-shaped contour of the blunt trailing edge core material, and has good operability; the sandwich size is accurately matched, gaps do not need to be filled, and the weight is reduced; the splicing time is shortened, and the production efficiency is improved; the quality problem that blunt trailing edge core material clearance too big causes can be effectively solved, the wind-powered electricity generation blade quality has been guaranteed.
Drawings
FIG. 1 is a schematic diagram of a conventional wind turbine blade blunt-tail core material partition,
FIG. 2 is a schematic diagram of splicing blunt-tail core materials of existing wind power blades,
figure 3 is a schematic view of a blunt trailing edge core profile,
figure 4 is a plan view of an embodiment of a blunt trailing edge core V-notch 1,
figure 5 is a side view of an embodiment of a blunt trailing edge core V-notch 1,
figure 6 is a plan view of an embodiment 2 of a blunt trailing edge core V-notch,
figure 7 is a side view of an embodiment 2 of a V-shaped cut of blunt trailing edge core material,
figure 8 is a perspective view of a blunt trailing edge core V-notch,
FIG. 9 is a schematic diagram of a wind turbine blade blunt tail core material spliced by trapezoidal unit blocks,
in the figure: a is a flat plate raw material, B is a trapezoidal unit block, C is an equal dividing line, D is a cutting line, L1 is an arc length of an outer ring of an arc part, L2 is an arc length of an inner ring of the arc part, delta L is an arc length difference, N is an equal dividing number, S is a V-shaped cutting groove width, X is a gap, and X1 is an X5 is a gap of an outer surface of an existing flat plate block.
Detailed Description
The invention is further described by the following specific embodiments in conjunction with the attached drawings:
as shown in fig. 1 and 2: the angle of the blunt trailing edge corner of the blade is large (the maximum position is close to 80 degrees), the thickness of the sandwich at the position is large (basically more than 35 mm), the conventional core material processing mode is generally flat plate block processing, the separation groove is of a straight-through type, so that a V-shaped gap is naturally formed after the core material at the blunt trailing edge corner (curved surface) is laid, the difficulty of identification from the inner surface is large, the gap of the outer surface is larger, the gap at the maximum position is close to 10mm, and the gap exceeds 5mm required by the industry by nearly one time. In order to solve the problem of overlarge gap between the outer surfaces of the sandwich cores at the blunt trailing edge, the mode of filling the same core material or glass fiber yarns is generally adopted in the wind power industry at present, but the operation difficulty is higher, the consumed time is longer, and the hidden quality trouble exists.
The design method and the cutting method of the blunt tail core material of the wind power blade are shown in figures 1 to 9:
the method comprises the following steps: firstly, drawing the blunt trailing edge core material profile of the wind power blade, finding out the arc-shaped part of the blunt trailing edge core material profile (as shown in fig. 3), and measuring the outer ring arc length L1 of the blunt trailing edge core material arc-shaped part and the inner ring arc length L2 of the blunt trailing edge core material arc-shaped part.
Step two: and selecting a flat plate raw material A with the same thickness according to the thickness of the blunt tail edge core material, and cutting the flat plate raw material A according to the outer ring arc length L1 of the blunt tail edge core material shape part.
Step three: dividing the arc length difference Delta L into N-1 equal parts according to the arc length difference Delta L = L1-L2 between the outer ring arc length L1 of the tail edge core material-shaped part and the inner ring arc length L2 of the shaped part to obtain the V-shaped cutting groove width S =DeltaL ÷ (N-1), and drawing N-1 equal division lines C on one side surface of the flat plate raw material A.
Step four: cutting lines D (shown in figure 4) with the V-shaped cutting groove width S are respectively scribed in the same direction of each bisector C; or two cutting lines D (shown in figure 6) with the V-shaped cutting groove width S are respectively marked on two sides of each bisector C.
Step five: the flat plate stock a is V-grooved along the cutting line D by means of electric sawing, planing or milling to cut the flat plate stock a into rectangular trapezoid unit blocks (as shown in fig. 5) or isosceles trapezoid unit blocks (as shown in fig. 7 and 8).
Step six: the trapezoid unit blocks B are placed into a wind power blade mould and spliced into a blunt trailing edge core material (as shown in figure 9), and the gap X between the trapezoid unit blocks B is very small and usually smaller than 2.5mm, so that the technical requirement that the industrial standard is smaller than 5mm is met. The gap does not need to be filled, the weight of the wind power blade is reduced, the splicing time is shortened, the production efficiency is improved, and the quality of the wind power blade is ensured.
In summary, the following steps: the invention has the beneficial effects that: the flat plate raw material is cut into trapezoidal unit blocks, and then the trapezoidal unit blocks are spliced into the blunt trailing edge core material of the wind power blade. The splicing mode is closer to the arc-shaped contour of the blunt trailing edge core material, and has good operability; the sandwich size is accurately matched, gaps do not need to be filled, and the weight is reduced; the splicing time is shortened, and the production efficiency is improved; the quality problem that blunt trailing edge core material clearance too big causes can be effectively solved, the wind-powered electricity generation blade quality has been guaranteed.
The above embodiments are provided for illustrative purposes only and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should fall within the scope of the present invention, and the scope of the present invention should be defined by the claims.
Claims (10)
1. A design method of a blunt tail core material of a wind power blade is characterized by comprising the following steps: the wind power blade blunt trailing edge core material is formed by cutting a flat plate raw material (A) into trapezoidal unit blocks (B) and splicing the N trapezoidal unit blocks (B).
2. The design method of the blunt tail core material of the wind power blade according to claim 1, characterized in that: the trapezoidal unit block (B) is obtained by cutting the flat plate raw material (A) in a V-shaped grooving mode.
3. The design method of the blunt tail core material of the wind power blade as claimed in claim 2, wherein:
the arc part of the blunt trailing edge core material outline is unfolded into a flat plate, the flat plate is divided into N equal parts, the arc length difference (delta L) is divided into N-1 equal parts according to the arc length difference (delta L) between the outer ring arc length (L1) of the arc part of the trailing edge core material and the inner ring arc length (L2) of the arc part, and the V-shaped cutting groove width (S =deltaL divided by (N-1)) is obtained.
4. The design method of the blunt tail core material of the wind power blade as claimed in claim 3, wherein: selecting the length (L) of the flat plate raw material to be equal to the outer ring arc length (L1) of the arc-shaped part of the blunt tail edge core material, dividing N-1 bisectors (C) on one side surface of the flat plate raw material (A), dividing cutting lines (D) with the interval of V-shaped cutting groove width (S) on the same-direction side of each bisector (C), cutting the V-shaped cutting grooves on the other side of the flat plate raw material (A) along the cutting lines (D), and cutting the flat plate raw material (A) into the trapezoid unit blocks (B).
5. The design method of the blunt tail core material of the wind power blade as claimed in claim 4, wherein: cutting lines (D) are respectively marked on the same side of each bisector (C) and at the positions with the V-shaped cutting groove width (S).
6. The design method of the blunt tail core material of the wind power blade as claimed in claim 4, wherein: two cutting lines (D) are respectively marked on two sides of each bisector (C), and the distance between the two cutting lines (D) is the V-shaped cutting groove width (S).
7. The wind power blade blunt tail core material cutting method according to any one of claims 1 to 6, characterized in that: the method comprises the following steps:
the method comprises the following steps: drawing a profile diagram of the core material with the blunt trailing edge;
step two: selecting a flat plate raw material (A) with the same thickness according to the thickness of the blunt trailing edge core material, and cutting the flat plate raw material (A) according to the outer ring arc length (L1) of the blunt trailing edge core material part;
step three: dividing the arc length difference (Delta L) into N-1 equal parts according to the arc length difference (Delta L) between the outer ring arc length (L1) of the tail edge core material shape part and the inner ring arc length (L2) of the shape part to obtain the V-shaped cutting groove width (S), and drawing N-1 equal lines (C) on one side surface of the flat plate raw material (A);
step four: cutting lines (D) with the interval of V-shaped cutting groove width (S) are respectively marked at the position of each bisector (C);
step five: v-shaped grooving is carried out on the flat plate raw material (A) along a cutting line (D), and the flat plate raw material (A) is cut into trapezoid unit blocks (B);
step six: and (3) placing the trapezoidal unit blocks (B) into a wind power blade mould, and splicing into a blunt trailing edge core material.
8. The method for cutting the blunt tail core material of the wind power blade according to claim 7, wherein: v-shaped grooving is carried out on the flat plate raw material (A) by adopting an electric saw.
9. The method for cutting the blunt tail core material of the wind power blade according to claim 7, wherein: v-shaped grooving is carried out on the flat plate raw material (A) by using a V-shaped planer tool in a planing mode.
10. The method for cutting the blunt tail core material of the wind power blade according to claim 7, wherein: and V-shaped grooving is carried out on the flat plate raw material (A) by utilizing a V-shaped milling cutter in a milling mode.
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| CN202011153573.XA CN112476576A (en) | 2020-10-26 | 2020-10-26 | Design and cutting method for blunt tail core material of wind power blade |
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| CN202011153573.XA CN112476576A (en) | 2020-10-26 | 2020-10-26 | Design and cutting method for blunt tail core material of wind power blade |
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Application publication date: 20210312 |
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