CN119567601A - Method for forming corner R angle of web plate of blade - Google Patents

Abstract

The present invention relates to a blade web corner R angle forming method, comprising: preparing an R angle mold and a web mold according to design parameters, applying a release agent on the web mold and marking the positioning of the R angle mold, and bonding and fixing the R angle mold on the web mold in sequence according to the marking position, laying a non-porous isolation film in the groove of the web mold, pouring a uniform curable material into the groove and scraping it flat, heating and curing to obtain an R angle finished product, laying a demoulding cloth and a glass fiber cloth layer, sequentially placing the R angle finished product, folding the glass fiber cloth layer and sticking it to the large surface of the web mold, laying a web structure layer, and pouring, curing and demoulding to obtain the web corner R angle. The present invention can eliminate the stress concentration of the web corner, avoid local instability of the blade, and improve the load resistance and safety of the entire blade.

Description

Method for forming corner R angle of web plate of blade

Technical Field

The invention relates to the technical field of wind power blades, in particular to a blade web corner R angle forming method.

Background

The web is arranged in the cavity of the wind power blade and supports the main beam, the main beam is mainly used for bearing most of shearing load, the main flange and the auxiliary flange transfer the shearing force on the main beam to the web, the blade is prevented from being unstable, and the load resistance of the whole blade is improved.

The web is made of a sandwich structure of double-shaft cloth, core material and double-shaft cloth, namely, the inner surface and the outer surface are both made of glass fiber reinforced plastic composite materials, foam or Balsa (balsawood) is wrapped in the middle, the web is directly adhered into a cavity of the blade through structural adhesive, the adhesion of the web is mainly dependent on a main flange and an auxiliary flange of the web to form an adhesion surface, the form and the quality condition of the adhesion surface have great influence on the adhesion performance of the web, the adhesion surface of the web consists of the main flange and the auxiliary flange, the main flange and the auxiliary flange are formed by the steel flange edges of a web mold in an auxiliary mode, the design of the web is I-shaped at present, and the flange shape of the web of the blade changes according to different positions and angles and widths, so that the corner forming of the formed web is an acute angle, an obtuse angle or even a right angle, the stress is concentrated, and the stress concentration or stress superposition at the corner of the web is easy to cause the unstable and failure of the blade in the operation process of the blade. In addition, the difficulty of auxiliary bonding and main bonding both sides for web corner R angle shaping is big, and the operation process can not effective control, and the R angle that easily forms the corner rich resin and cause the preparation is up to standard and R angle size is unstable, consequently still causes web corner stress concentration easily in the blade operation in-process.

Therefore, there is a need for a method of forming a corner R of a web of a blade that eliminates stress concentrations at the corner of the web and avoids failure of the blade due to instability.

Disclosure of Invention

The invention aims to provide a blade web corner R angle forming method capable of avoiding stress concentration or stress superposition of web corners, so as to solve the problem of unstable and invalid blade caused by stress concentration or stress superposition of the existing web corners.

The basic scheme of the invention is that the R-angle forming method of the web corner of the blade comprises the following steps of S1, preparing an R-angle die and a web die according to design parameters, smearing a release agent on the web die, S2, carrying out positioning line drawing on the R-angle die on the web die, sequentially adhering and fixing the R-angle die on the web die according to the line drawing position, S3, paving a non-porous isolating film in a groove of the web die, pouring a uniform curable material into the groove, scraping, heating and curing to obtain an R-angle finished product, S4, paving a release cloth and a glass fiber cloth layer, sequentially putting the R-angle finished product into the glass fiber cloth layer, folding and wrapping the R-angle finished product, pasting a large surface of the web die, S5, paving a web structural layer, pouring and curing, and demolding to obtain the R-angle of the web corner.

Further, in the step S1, the R-angle mold is manufactured by adopting a milling machine processing or die-pressing and pultrusion forming mode, wherein the R-angle mold material is PVC, polyethylene, nylon, plastic steel and pultrusion glass when the milling machine processing is performed, and the R-angle mold material is metal when the die-pressing and pultrusion forming is performed, through preparing fabric impregnating resin glue solution with a required shape in advance, placing the fabric impregnating resin glue solution into a metal mold, heating and pressurizing the metal mold, and obtaining the R-angle mold.

Further, in the step S1, the web mold processing comprises the steps that the web mold adopts a water heating metal mold, the starting point and the end point of the mold are larger than 500mm of the product, the allowable deviation of the width of the product area of the mold is +/-1 mm, the allowable deviation of the flange widths at two sides is +1mm to +2mm, the flange width is the product width plus 10mm, the flanging width is 300mm, the allowable deviation of the central line chord direction is +/-1 mm, the allowable deviation of the flange angle is +/-1 DEG, the integral elevation error is +/-3 mm, the roughness of the surface of the mold is less than or equal to 8um, and the axial segmentation position of the mold is determined according to the web length.

Further, in the step S2, a corresponding R angle die is selected according to the position and angle change of the web flange, a steel plate ruler is used for translating to the flange to be drawn on the web flange on the inner side of the web flange in a manner of clinging to the web large surface for drawing and positioning, the R angle die is bonded at the marked drawing position of the web flange, and the R angle die is sequentially connected and bonded and fixed from a blade root to a blade tip, wherein the bonded R angle die is in linear transition.

Further, the curable material is a silicone gel.

Further, in the step S3, a solid non-porous isolating film is paved in a groove of the web mold, a uniformly stirred curable material is poured into the groove, twistless roving is put in the middle of the groove, the curable material is scraped to be flush with the large surface of the web mold and the R-angle mold by a scraping plate, a mold heating system is started, heating and curing are carried out at 40-70 ℃ for 5-8 hours, and then the R-angle mold which is assisted in molding is removed to obtain a molded R-angle finished product.

Further, in the step S4, the R-angle finished product is trimmed, so that the surface of the R-angle finished product is free of uneven and steps which are not smaller than 2mm, demolding cloth and 2-4 layers of glass fiber cloth are laid in a groove of an auxiliary flange area of a web plate in a clinging mode to the flange to form a glass fiber cloth layer, the R-angle finished product is sequentially placed in the groove in a compacting mode and clings to the groove, the upper surface of the R-angle finished product is flush with the large surface of the web plate die, no steps are arranged at the butt joint position of the R-angle finished product and the web plate, and the R-angle finished product is folded and wrapped by the glass fiber cloth layer to be clinged to the large surface of the web plate die.

Further, in the step S5, a web plate structural layer is laid according to a design process, a valve of a vacuum pump is opened for vacuumizing, a first bag film is not stretched after vacuumizing, a sealing rubber strip is pressed along the edge of a die, the first bag film is tightly attached to the sealing rubber strip and the die, no air leakage exists, after the first bag film is vacuumized, the vacuum pump is read to be more than or equal to 83Kpa, a second bag film is sealed, two layers of bag films are connected through a flow guide net or air-permeable cotton, the flow guide net or the air-permeable cotton is communicated with the front edge and the rear edge in a Z-shaped manner and extends from the root of the die to the tip of the die for paving, a spiral steel wire pipe is inserted into a rubber injection seat, after connection is completed, the valve of the vacuum pump and the air-permeable pipeline in the first bag film is closed, all corresponding vacuum pumps and the air-permeable pipeline are kept open, the second bag film is kept to be air-inflated, the pressure maintaining is started, the pressure maintaining rule is that the change within 10 minutes is not more than 15mbar, the sealing state of the bag film is good, vacuum filling can be carried out, after the filling is completed, the product is cured, the Tg value and the Shore angle is randomly measured at the position of the cross section, the test point, the hardness is determined, the Shore angle C is 70 DEG, the hardness is high, and the HD is 70 DEG, and the die hardness is the corner is 55 DEG is the corner temperature is reduced, if the corner hardness is 55 is reached, and the corner hardness is obtained.

Compared with the prior art, the method has the advantages that the R-angle mould and the web mould are prepared according to design parameters, the web mould is smeared with release agent, the positioning and the line drawing of the R-angle mould are carried out, the R-angle mould is sequentially adhered and fixed on the web mould according to the line drawing position, the aporate isolating film is laid in the groove of the web mould, uniform curable materials are poured into the groove and scraped flat, the R-angle finished product is obtained by heating and curing, the release cloth and the glass fiber cloth layer are laid, the R-angle finished product is sequentially put into the R-angle finished product, the glass fiber cloth layer is folded and wrapped on the large surface of the web mould, the web structural layer is laid, the pouring and curing are carried out, the R-angle of the web corner is obtained by demolding, and the problem that the web corner stress concentration or stress superposition causes the instability and the failure of the blade is solved, so that the local instability of the blade can be avoided, and the load resistance capability and the safety of the whole blade are improved.

Drawings

FIG. 1 is a flow diagram of a method of forming a corner R of a web of a blade in one embodiment;

FIG. 2 is a schematic overall flow diagram of a method of forming a corner R of a web of a blade in one embodiment;

FIG. 3 is a schematic view of the structure of an R-angle mold in one embodiment;

fig. 4 is a schematic diagram of an application scenario of an R-angle mold in one embodiment;

FIG. 5 is a schematic diagram of the structure of the R-angle product in one embodiment;

FIG. 6 is a schematic view of the locations of the R-angle finish and the fiberglass cloth layer in one embodiment;

Fig. 7 is a schematic view of the structure of the web corner R angle in one embodiment.

In the drawing, an R-angle mold 1, a web mold 2, a pore-free isolating film 3, silica gel 4, an R-angle finished product 5, a glass fiber cloth layer 6 and a web corner R-angle 7.

Detailed Description

In order to make the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As shown in fig. 1 and 2, there is provided a blade web corner R-angle forming method comprising the steps of:

And S110, preparing an R angle mould and a web mould according to design parameters, and smearing a release agent on the web mould.

Specifically, according to the design parameters of the R-angle mold and the web mold, the corresponding R-angle mold and web mold are prepared, as shown in fig. 3, to obtain the R-angle mold 1, and the web mold is coated with a release agent, so that the subsequent demolding is facilitated.

In step S110, the R-angle mold is prepared by adopting a milling machine processing or die-pressing and pultrusion molding mode, wherein the R-angle mold material is PVC, polyethylene, nylon, plastic steel and pultrusion glass when the milling machine processing is carried out, and the R-angle mold material is metal when the die-pressing and pultrusion molding is carried out by preparing fabric impregnating resin glue solution with a required shape in advance, and then placing the fabric impregnating resin glue solution into a metal mold for heating and pressurizing molding.

Specifically, in the preparation of the R angle, a milling machine processing mode and a die-pressing and pultrusion mode can be adopted.

When the milling machine processing mode is adopted for die preparation, the R angle die is processed through a milling machine or a five-axis machine tool according to the die parameters of the designed R angle, for example, 5mm-30mm, the length of the R angle die is 0.1m-2m, the width of two sides of the die can be synchronously selected according to the size of the R angle, when the milling machine is used for processing, the R angle die can be made of PVC, polyethylene, nylon, plastic steel, pultrusion glass reinforced plastic and the like, the R angle die can be selectively processed and molded according to actual conditions, and all surfaces of the R angle die are smooth surfaces.

When the R-angle mould is prepared by adopting a compression-extrusion forming mode, according to mould parameters of the designed R-angle, for example, 5mm-30mm, a fabric which is woven into a required shape in advance is immersed in resin glue solution, and the fabric is placed into a metal mould to be heated and pressed to form the compression-extrusion forming R-angle mould, the compression-extrusion forming R-angle mould is made of metal, the length of the R-angle mould is 0.1m-2m, and the width of two sides of the mould can be synchronously selected according to the size of the R-angle.

In the step S110, the web mold processing comprises the steps that a water heating metal mold is adopted in the web mold, the starting point and the end point of the mold are larger than 500mm of a product area, the allowable deviation of the width of the product area of the mold is +/-1 mm, the allowable deviation of flange widths on two sides is +1mm to +2mm, the flange widths are 10mm plus the product width, the flanging width is 300mm, the allowable deviation of the central line chord direction is +/-1 mm, the allowable deviation of the flange angle is +/-1 DEG, the integral elevation error is +/-3 mm, the roughness of the surface of the mold is less than or equal to 8um, and the axial segmentation position of the mold is determined according to the web length.

Specifically, when the web mold is processed, parameters such as the appearance, the length, the width and the like of a web are determined according to actual projects and models, a web metal mold is manufactured according to parameter requirements, the web metal mold is in an I-shaped mold form, the web metal mold is heated by water, the starting point and the end point of the mold are larger than 500mm areas of a product, the allowable deviation of the width of the product area of the mold is +/-1 mm, the allowable deviation of flange widths on two sides is +1mm to +2mm, the flange width is the product width plus 10mm, the flanging width is 300mm, the allowable deviation of the chord direction of a central line is +/-1 mm, the allowable deviation of the flange angle is +/-1 DEG, the integral elevation error is +/-3 mm, and the roughness of the surface of the mold is less than or equal to 8um.

The axial sectional position of the web mold is determined according to the length of the web, the steel plate molded surface used by the mold has enough strength and rigidity, the mold must conform to the manufacturing of glass fiber reinforced plastic web products, deformation, warping and other conditions exist in the production and use process, the metal mold is manufactured according to the requirements, the mold is cleaned integrally after being installed in a factory and subjected to vacuum pressure maintaining, degreasing rags are used for cleaning, oily release agent (water release agent can be used) is used for uniformly wiping the surface of a mold product area in a spiral mode after cleaning, the excessive release agent is volatilized after waiting for 10min, a layer of film is formed on the surface of the mold, and then the actions are repeated for 3 times again, so that the mold can be used for producing products.

And S120, positioning and drawing lines of the R-angle mold are carried out on the web mold, and the R-angle mold is sequentially adhered and fixed on the web mold according to the drawing line positions.

Specifically, according to the changes of different angles at different positions, preparing an R angle mould, positioning and scribing the R angle mould on the prepared web mould, and sequentially adhering and fixing the R angle mould 1 on the web mould 2 according to the scribing position, as shown in fig. 4, so that all R angles are formed at the butt joint corner positions of the web auxiliary flange and the web.

The method comprises the steps of S120, selecting a corresponding R-angle die according to the position and angle change of a web flange, translating the inner side of the web die flange to the flange by using a steel plate ruler to cling to the large surface of the web for carrying out point drawing and line positioning, bonding the R-angle die at the marked line drawing position of the web die flange, sequentially connecting and bonding and fixing from a blade root to a blade tip, and linearly transiting the bonded R-angle die.

Specifically, a web die 2 and a required R angle die 1 are prepared, different R angle dies are selected according to different positions and angle changes of a web steel flange, a steel plate ruler is adopted on the inner side of the web die 2 flange to be tightly clung to a large surface of the web to translate to the flange for carrying out point drawing and line positioning, then the R angle die 1 is adhered to the marking and line drawing position of the web steel die flange, the blade root is sequentially connected with the blade tip from the blade tip to the blade tip and is adhered and fixed, the R angle die is required to linearly transit on a straight line, the conditions such as dislocation or wave cannot exist, and the like, so that the accurate adhering position of the R angle die is ensured.

And S130, paving a non-porous isolating film in a groove of the web plate die, pouring uniform curable material into the groove, scraping, and heating and curing to obtain an R-angle finished product.

Specifically, in order to prepare the R-angle product, a pore-free isolating film 3 is laid in a groove of the web mold 1, as shown in fig. 4, a curable material 4 which is stirred uniformly in advance, such as epoxy resin, polyurethane and the like, is poured into the groove, the curable material in the groove is scraped flat, the R-angle product 5 is obtained by heating and fixing, and the preparation of the R-angle product is realized, so that the web corner R-angle molding is performed according to the obtained R-angle product, as shown in fig. 5.

Wherein the curable material is silica gel.

Specifically, silica gel is selected as a curable material, has good high temperature resistance, can keep the original physical properties at high temperature, has good weather resistance, can resist the influence of environmental factors such as ultraviolet rays, ozone and the like, and has long service life.

The method comprises the step S130 of paving a solid non-porous isolating film in a groove of a web die, pouring a uniformly stirred curable material into the groove, putting twistless roving in the middle of the groove, scraping the curable material to be level with the large surface of the web die and an R-angle die by a scraping plate, starting a die heating system, heating and curing at 40-70 ℃ for 5-8 hours, and removing the R-angle die which is assisted in molding to obtain a molded R-angle finished product.

Specifically, a solid non-porous isolating film 3 is paved and adhered in a groove of a web die 1, the non-porous isolating film 3 is not suspended and piled up, silica gel or similar curable materials 4 which are uniformly stirred in advance are poured into the groove, after pouring, the silica gel or similar curable materials are scraped to be flush with the large surface of the web and an R-angle die 1 by using a scraping plate, a die heating system is started, heating and curing are carried out at 40-70 ℃, the auxiliary-molding R-angle die is removed after heating and curing are carried out for 5-8 hours, and then molded R-angle finished products 5 are sequentially taken out.

In order to prevent the deformation of the R-angle product 5 from causing misalignment, after pouring silica gel or similar curable objects into the grooves, 2-8 pieces of 2400TEX roving can be placed in the middle to be cured and molded together with the silica gel, the R-angle product 5 is integral in the length direction and can not be broken in the middle, the length of the R-angle product can be determined according to project requirements, the length of the R-angle product is generally 20-100 m, and a single set of web is required to be molded into 2-6R-angle products.

And S140, laying a release cloth and a glass fiber cloth layer, sequentially putting the R-angle finished product into the release cloth, folding the glass fiber cloth layer to wrap the R-angle finished product, and pasting the large surface of the web plate mould.

Specifically, as shown in fig. 6, a demolding cloth and a glass fiber cloth layer 6 are laid on the web mold 2, corresponding R-angle finished products 5 are sequentially placed according to the positions of the web grooves, the R-angle finished products are compacted and tightly adhered to the grooves after being placed into the grooves, and the glass fiber cloth layer 6 is folded over to wrap the R-angle finished products 5 and tightly adhered to the large surface of the web mold 2.

The method comprises the steps of repairing an R-angle finished product to enable the surface of the R-angle finished product to have no uneven and step larger than or equal to 2mm, laying demolding cloth and 2-4 layers of glass fiber cloth in a groove of an auxiliary flange area of a web plate in a clinging manner to form a glass fiber cloth layer, sequentially placing the R-angle finished product into the groove in a compacting manner, compacting the groove in a clinging manner, enabling the upper surface of the R-angle finished product to be flush with the large surface of a web plate die and have no step at the butt joint position of the R-angle finished product and the web plate, folding the glass fiber cloth layer to wrap the R-angle finished product, and pasting the large surface of the web plate die.

Specifically, a craft knife or other repairable tools are adopted to repair the R-angle finished product die, so that the surface of the R-angle finished product is free of uneven and steps which are not smaller than or equal to 2mm, after finishing repairing, the R-angle finished product 5 is sequentially placed in the groove of the web auxiliary flange area according to the corresponding position after laying 2-4 layers of glass fiber cloth on the steel flange, the R-angle finished product 5 is placed in the groove and then compacted and tightly attached to the groove, no overhead exists, the upper surface is flush with the web big surface, no steps exist at the butt joint position of the web, and the like, and then the required glass fiber cloth layer 6 is folded to wrap the R-angle finished product 5 and attach the web die big surface.

And S150, laying a web structural layer, pouring, solidifying and demolding to obtain a web corner R angle.

Specifically, a web plate structural layer is laid according to a blade design structure, pouring and curing operation is carried out, and finally demolding is carried out to obtain a web plate corner R angle, as shown in fig. 7, the forming of the web plate corner R angle is realized, the problem that the web plate corner stress concentration or stress superposition causes instability failure of the blade in the running process of the blade can be solved, the quality hidden trouble caused by the web plate corner stress concentration is eliminated, so that the load resistance of the blade is improved, and the safety of a product is improved.

The method comprises the steps of laying a web structure layer according to a design process, opening a vacuum pump valve for vacuumizing, enabling a first bag film to be free of tightness after vacuumizing, pressing a sealing rubber strip position along the edge of a die, enabling the first bag film to be tightly attached to the sealing rubber strip and the die, enabling the sealing rubber strip and the die to be free of air leakage, sealing a second bag film when the reading of the vacuum pump is more than or equal to 83Kpa after the first bag film is vacuumized, connecting the two bag films by using a diversion net or air-permeable cotton, enabling the diversion net or the air-permeable cotton to be communicated with the front edge and the rear edge of the die in a Z shape and extend from the root of the die to the tip for paving, inserting a spiral steel wire pipe at a glue injection seat, after connection is completed, closing a corresponding vacuum pump and an air suction pipeline valve when the reading of a vacuum meter in the first bag film is less than 20mbar, keeping all air suction openings open, enabling the second bag film to be continuously kept air-suction, enabling the pressure keeping rule to be 10 minutes, enabling vacuum filling to be well carried out when the filling is completed, enabling the change of the sealing rubber bag film to be not more than 15mbar, and enabling the test points to be randomly extracted at the chord position to be measured after the sealing position, determining Tg value and the sealing point to be used for measuring the Shore hardness, determining hardness and hardness, and hardness of a boss to be 70 DEG, and cooling the die to be 55 DEG, and if the hardness is equal to 55 DEG, and the hardness is equal to or more than 55R, and the standard hardness is achieved when the die is required.

Specifically, the residual structural layers are sequentially laid according to the design or process requirements of different projects, a vacuum pump valve is opened, vacuumizing is started, and meanwhile, a vacuum bag film is adjusted to be tightly attached to a flanging corner, a runner, an exhaust vacuum tube and the like, so that the vacuum bag film is not tightly stretched after vacuum pumping, and meanwhile, the sealing rubber strip is pressed along the edge of a die, so that the vacuum bag film is tightly attached to the sealing rubber strip and the die, and no air leakage exists. After the first layer of bag film is tightly drawn, when the reading of the vacuum pump is more than or equal to 83Kpa, the second layer of bag film is sealed, the two layers of bag films are connected by a flow guide net or air-permeable cotton, and the flow guide net or the air-permeable cotton is communicated with the front edge and the rear edge according to Z shape and extends from the root of the die to the tip of the die for laying.

After sealing 2 layers of bag films, inserting a spiral steel wire pipe into the glue injection seat, after connection, closing a layer of vacuum pump and an air exhaust pipeline valve when the reading of a vacuum meter in 1 layer of bag film is less than 20mbar, keeping all air exhaust ports open, keeping 2 layers of bag films continuously exhausting, starting pressure maintaining, and keeping the pressure maintaining rule to ensure that the change of the pressure maintaining rule within 10 minutes is not more than 15mbar, so that the bag films can be well sealed and can be subjected to vacuum infusion.

When the pouring is started, the temperature of the die is set to be 35-50 ℃, the die is adjusted to be 65-85 ℃ after the pouring is finished, the temperature can be correspondingly adjusted according to the local atmospheric pressure until the die is cured for 5-8 hours, after the surface of a product is cured, the flange and the large-surface hardness are tested every 5m, the chord-wise positions of the cross section are randomly extracted, meanwhile, the Tg value is measured according to glass fiber reinforced plastic and adhesive Tg test specifications, and Tg is more than 70 ℃ and Shore hardness is more than 55HD and is qualified. And simultaneously, the web large-surface cotton quilt is lifted, the hot water circulation is closed, and the cold water circulation is started. The temperature of the upper surface is reduced to 40 ℃, the temperature of the contact surface of the product and the die is reduced to 50 ℃, the cooling time is more than or equal to 90 minutes, and the die can be pulled out.

Starting a crane to move the web hanging beam tool to the upper part of the web, enabling the position of a first hanging point and the manual die-release position to be not more than 2m, along with the advance of the rubber roller, placing hanging strips from one side of the web flange to the other side through the lower surface at intervals of 4m, integrally forming an auxiliary flange, installing a protection tool on the auxiliary flange at the position of the cross section, connecting two ends of the hanging strips with the web hanging beam tool, enabling the hanging height of each hanging strip to be not more than 1.5m, and sequentially lifting from the blade root to the blade tip until the web is completely die-released.

Web corner shaping behind the drawing of patterns is web corner R angle 7, and the effectual stress concentration who eliminates the web corner of blade operation in-process of web corner R angle has effectually promoted the anti load ability of blade, has promoted the security performance of whole blade.

In the embodiment, an R angle mold and a web mold are prepared according to design parameters, a release agent is smeared on the web mold, positioning and line drawing of the R angle mold are carried out, the R angle mold is sequentially adhered and fixed on the web mold according to the line drawing position, a non-porous isolating film is laid in a groove of the web mold, a uniform curable material is poured into the groove and is scraped flat, a R angle finished product is obtained by heating and curing, a release cloth and a glass fiber cloth layer are laid, the R angle finished product is sequentially put into the R angle, the glass fiber cloth layer is folded and wrapped on the R angle finished product and is stuck on the large surface of the web mold, a web structural layer is laid, and the pouring and curing are carried out, so that the problem that the web corner stress concentration or stress superposition causes the blade to be unstable and invalid is solved, and therefore, the local instability of the blade can be avoided, and the load resistance and the safety of the whole blade are improved.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The foregoing is merely an embodiment of the present application, and a specific structure and characteristics of common knowledge in the art, which are well known in the scheme, are not described herein, so that a person of ordinary skill in the art knows all the prior art in the application date or before the priority date, can know all the prior art in the field, and has the capability of applying the conventional experimental means before the date, and a person of ordinary skill in the art can complete and implement the present embodiment in combination with his own capability in the light of the present application, and some typical known structures or known methods should not be an obstacle for a person of ordinary skill in the art to implement the present application. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present application, and these should also be considered as the scope of the present application, which does not affect the effect of the implementation of the present application and the utility of the patent. The protection scope of the present application is subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.

Claims (8)

1. A blade web corner R angle forming method, characterized in that it comprises the following steps: S1. Prepare an R-angle mold and a web mold according to design parameters, and apply a release agent on the web mold; S2, marking the positioning of the R angle mold on the web mold, and sequentially bonding and fixing the R angle mold on the web mold according to the marking position; S3, laying a non-porous isolation film in the groove of the web mold, pouring a uniform amount of curable material into the groove and scraping it flat, heating and curing to obtain an R-corner finished product; S4, laying out the demoulding cloth and the glass fiber cloth layer, placing the R corner finished product in sequence, folding the glass fiber cloth layer to wrap the R corner finished product and adhere it to the large surface of the web mold; S5. Lay out the web structure layer, pour and solidify, and demould to obtain the web corner R angle. 2. A blade web corner R angle forming method according to claim 1, characterized in that, in the step S1, the R angle mold is prepared by milling machine processing or compression pultrusion; Wherein, when the milling machine is used, the R angle mold material is PVC, polyethylene, nylon, plastic steel and pultruded glass; When performing compression pultrusion molding, a fabric of a desired shape is prepared in advance and impregnated with resin glue, and then placed in a metal mold for heating and pressurization molding to obtain an R-angle mold, wherein the R-angle mold material is metal. 3. A blade web corner R angle forming method according to claim 1, characterized in that, in the step S1, the web mold processing comprises: The web mold adopts a water-heated metal mold. The starting and end areas of the mold must be larger than the 500mm area of the product. The allowable deviation of the width of the product area of the mold is ±1mm, the allowable deviation of the flange width on both sides is +1mm~+2mm, the flange width is the product width plus 10mm, the flanging width is 300mm, the allowable deviation of the centerline chord direction is ±1mm, the allowable deviation of the flange angle is ±1°, the overall elevation error is ±3mm, the roughness of the mold surface is less than or equal to 8um, and the axial segment position of the mold is determined according to the web length. 4. A blade web corner R angle forming method according to claim 1, characterized in that, in the step S2, it comprises: Select the corresponding R angle mold according to the position and angle change of the web flange, and use a steel ruler to move it horizontally on the flange close to the large surface of the web to mark points and lines for positioning; The R angle mold is bonded to the marked line position of the web mold flange, and is sequentially connected and bonded from the blade root to the blade tip, wherein the bonded R angle mold has a linear transition. 5. A blade web corner R angle forming method according to claim 1, characterized in that the curable material is silicone. 6. A blade web corner R angle forming method according to claim 1, characterized in that, in the step S3, it comprises: Lay a non-porous isolation film in the groove of the web mold, pour the evenly stirred curable material into the groove, put untwisted roving in the middle of the groove, and use a scraper to scrape the curable material until it is flush with the large surface of the web mold and the R corner mold; The mold heating system is turned on and heated and cured at 40-70°C. After heating and curing for 5-8 hours, the auxiliary forming R angle mold is removed to obtain a formed R angle finished product. 7. A blade web corner R angle forming method according to claim 1, characterized in that, in the step S4, it comprises: The R-angle finished product is trimmed so that the surface of the R-angle finished product has no unevenness or steps of ≧2 mm; Lay the release cloth and 2-4 layers of fiberglass cloth in the groove of the auxiliary flange area of the web close to the flange to form a fiberglass cloth layer; Put the R-angle finished products in sequence and press them tightly against the groove. The upper surface of the R-angle finished product is flush with the large surface of the web mold and there is no step at the docking position with the web. Fold the fiberglass cloth layer to wrap the R-angle finished product and stick it to the large surface of the web mold. 8. The blade web corner R angle forming method according to claim 1, characterized in that, in the step S5, it comprises: Lay out the web structure layer according to the design process, open the vacuum pump valve to draw a vacuum, so that the first bag film is not tight after the vacuum is drawn, press the sealing strip along the edge of the mold to make the first bag film fit tightly with the sealing strip and the mold without air leakage; After the first bag film is tightened, when the vacuum pump reading is ≥83Kpa, seal the second bag film, and connect the two layers of bag film with a guide net or breathable cotton. The guide net or breathable cotton is laid in a Z-shaped manner, connecting the front and rear edges and extending from the root of the mold to the tip of the mold; Insert the spiral steel wire tube into the injection seat. After the connection is completed, when the vacuum gauge reading in the first bag film is less than 20mbar, close the corresponding vacuum pump and exhaust pipeline valve, keep all exhaust ports open, continue to evacuate the second bag film, and start to maintain pressure. The pressure maintenance rule is that the change within 10 minutes does not exceed 15mbar, indicating that the bag film is in good sealing condition and can be vacuum infused; After the infusion is completed and the product is cured, test points are randomly selected in the chord direction of the cross section to measure the Tg value and Shore A Hardness, determine the hardness of the flange and web surface. If Tg>70℃ and Shore hardness>55HD, it is qualified. The mold is demolded by cooling to obtain the R angle of the web corner.