Blade web corner R angle forming method

Abstract

The invention relates to a blade web corner R-angle forming method which comprises the following steps: preparing an R-angle mold and a web mold according to design parameters, smearing a release agent on the web mold, carrying out positioning line drawing on the R-angle mold, and sequentially bonding and fixing the R-angle mold on the web mold according to the line drawing position, laying a non-porous isolating membrane in a groove of a web mold, pouring a uniform curable material into the groove, striking off, heating and curing to obtain an R-angle finished product, laying demolding cloth and a glass fiber cloth layer, sequentially putting the R-angle finished product, folding the glass fiber cloth layer, tightly attaching the glass fiber cloth layer to the large surface of the web mold, laying a web structural layer, and pouring, curing and demolding to obtain the web corner R-angle. According to the method, stress concentration of the web corners can be eliminated, local instability of the blade is avoided, and the load resistance and safety of the whole blade are improved.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine blades, and in particular to a method for forming an R-angle of a blade web corner. Background Art

[0002] The web is placed in the cavity of the wind turbine blade to support the main beam. Its main function is to bear most of the shear load. The main and auxiliary flanges transfer the shear force on the main beam to the web to prevent the blade from becoming unstable and improve the load resistance of the entire blade.

[0003] The web is made of a sandwich structure of "biaxial cloth + core material + biaxial cloth", that is, the inner and outer surfaces are both glass fiber reinforced plastic composite materials, and foam or Balsa (light wood) is wrapped in the middle. The web is directly bonded to the cavity of the blade by structural adhesive. The bonding of the web mainly depends on the main flange and auxiliary flange of the web to form a bonding surface. The form and quality of the bonding surface have a significant impact on the bonding performance of the web. The bonding surface of the web is composed of a main flange and an auxiliary flange, and the main flange and the auxiliary flange are assisted by the steel flange edge of the web mold. At present, the web design is I-shaped. Because the flange shape of the blade web changes according to different position angles and widths, the corners of the formed web are formed into acute angles, obtuse angles, or even right angles. Therefore, the stress is relatively concentrated. During the operation of the blade, it is easy to cause stress concentration at the corner of the web or stress superposition, resulting in blade instability and failure. In addition, it is difficult to form the R angle of the web corners on both sides of the auxiliary bonding and the main bonding, and the operation process cannot be effectively controlled, which easily leads to resin-rich corners, resulting in the R angle not meeting the standards and the R angle size being unstable. Therefore, it is easy to cause stress concentration at the web corners during the operation of the blade.

[0004] Therefore, there is an urgent need for a blade web corner R angle forming method that can eliminate stress concentration at the web corner and avoid blade instability and failure. Summary of the invention

[0005] The present invention aims to provide a method for forming the R-angle of the web corner of a blade, which can avoid stress concentration or stress superposition at the web corner, so as to solve the problem of stress concentration or stress superposition at the web corner of the existing blade, which leads to instability and failure of the blade. The present invention can improve the load resistance capacity and product safety of the entire blade.

[0006] In order to achieve the above-mentioned purpose, the basic scheme of the present invention is as follows: a method for forming an R-angle of a blade web corner, comprising: S1, preparing an R-angle mold and a web mold according to design parameters, and applying a release agent on the web mold; S2, marking the positioning line of the R-angle mold on the web mold, and bonding and fixing the R-angle mold on the web mold in sequence according to the marking position; S3, 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; S4, laying a demoulding cloth and a glass fiber cloth layer, placing the R-angle finished product in sequence, folding the glass fiber cloth layer to wrap the R-angle finished product and sticking it to the large surface of the web mold; S5, laying the web structure layer, pouring and curing, and demolding to obtain the R-angle of the web corner.

[0007] Furthermore, 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 the compression pultrusion is used, a fabric of the desired shape is pre-prepared and impregnated with resin glue, which is placed in a metal mold and heated and pressurized to obtain the R-angle mold, and the R-angle mold material is metal.

[0008] Further, in the step S1, the web mold processing includes: the web mold adopts a water-heated metal mold, the starting and end areas of the mold are larger than the 500mm area of ​​the product, the allowable deviation of the product area width 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.

[0009] Furthermore, in the step S2, it includes: selecting a corresponding R-angle mold according to the position and angle change of the web flange, using a steel ruler to translate the inner side of the web mold flange close to the large surface of the web to the flange for dot-drawing and line-drawing positioning; bonding the R-angle mold to the marked line position of the web mold flange, connecting and bonding it in sequence from the blade root to the blade tip, wherein the bonded R-angle mold has a linear transition.

[0010] Furthermore, the curable material is silica gel.

[0011] Furthermore, in the step S3, it includes: laying a compact non-porous isolation film in the groove of the web mold, pouring a uniformly stirred curable material into the groove, placing untwisted coarse yarn in the middle of the groove, and using a scraper to scrape the curable material until it is flush with the large surface of the web mold and the R-angle mold; turning on the mold heating system, heating and curing at 40-70°C, and after heating and curing for 5-8 hours, first removing the auxiliary molding R-angle mold to obtain a molded R-angle finished product.

[0012] Furthermore, in the step S4, it includes: shaping the R-angle finished product so that the surface of the R-angle finished product has no unevenness or steps ≧2mm; laying a 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; placing the R-angle finished products in sequence and pressing them close to 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, and folding the fiberglass cloth layer to wrap the R-angle finished product and close to the large surface of the web mold.

[0013] Furthermore, in the step S5, it includes: laying the web structure layer according to the design process, opening the vacuum pump valve to draw a vacuum, so that the first bag film is not tight after the vacuum is drawn, pressing the sealing strip position along the edge of the mold, so that the first bag film is tightly attached to the sealing strip and the mold without leakage; after the first bag film is drawn, when the vacuum pump reading is ≥83Kpa, sealing the second bag film, connecting the two layers of bag film with a guide net or breathable cotton, the guide net or breathable cotton is laid in a Z-shape to connect the front and rear edges and extend from the root of the mold to the tip of the mold; inserting a spiral steel wire tube at the injection seat, after the connection is completed, When the vacuum gauge reading in a bag of film is less than 20mbar, turn off the corresponding vacuum pump and exhaust pipeline valve, keep all exhaust ports open, continue to evacuate the second bag of film, and start pressure maintenance. The pressure maintenance rule is that the change does not exceed 15mbar within 10 minutes, 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, randomly select test points at the chordal position of the cross section to measure the Tg value and Shore hardness, and determine the hardness of the large surface of the flange and web. If Tg>70℃ and Shore hardness>55HD, it is qualified, and the temperature is lowered and the mold is demolded to obtain the R angle of the web corner.

[0014] Compared with the prior art, the advantages and beneficial effects of the present invention are: an R-angle mold and a web mold are prepared according to design parameters, a mold release agent is applied to the web mold, and the positioning line of the R-angle mold is drawn, and the R-angle mold is bonded and fixed to the web mold in sequence according to the line position, a non-porous isolation film is laid in the groove of the web mold, a uniform curable material is poured into the groove and scraped flat, and the R-angle finished product is obtained by heating and curing, a mold release cloth and a glass fiber cloth layer are laid, and the R-angle finished products are placed in sequence, the glass fiber cloth layer is folded and wrapped around the R-angle finished product and adhered to the large surface of the web mold, the web structure layer is laid, poured and cured, and demolding is performed to obtain the web corner R-angle, which solves the problem of stress concentration or stress superposition at the web corner causing the blade to become unstable and fail, thereby avoiding local instability of the blade and improving the load resistance and safety of the entire blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of a process of forming an R angle of a blade web corner in an embodiment;

[0016] Figure 2 It is a schematic diagram of the overall process of a blade web corner R angle forming method in one embodiment;

[0017] Figure 3 This is a schematic diagram of the structure of an R angle mold in one embodiment;

[0018] Figure 4 A schematic diagram of an application scenario of an R-angle mold in an embodiment;

[0019] Figure 5 This is a schematic diagram of the structure of a finished R corner product in one embodiment;

[0020] Figure 6 A schematic diagram of the positions of the R-corner finished product and the glass fiber cloth layer in one embodiment;

[0021] Figure 7 Schematic diagram of the structure of the web corner R angle in one embodiment.

[0022] In the accompanying drawings, there are an R-corner mold 1, a web mold 2, a non-porous isolation membrane 3, silica gel 4, an R-corner finished product 5, a glass fiber cloth layer 6 and a web corner R-corner 7. DETAILED DESCRIPTION

[0023] In order to make the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] like Figure 1 and 2 As shown, a blade web corner R angle forming method is provided, comprising the following steps:

[0025] Step S110, preparing an R-angle mold and a web mold according to design parameters, and applying a release agent on the web mold.

[0026] Specifically, according to the design parameters of the R angle mold and the web mold, the corresponding R angle mold and the web mold are prepared, such as Figure 3 As shown, the R-angle mold 1 is obtained, and a release agent is applied to the web mold to facilitate subsequent demoulding.

[0027] In step S110, the R-angle mold is prepared by milling machine processing or compression pultrusion; when milling machine processing is performed, the R-angle mold material is PVC, polyethylene, nylon, plastic steel and pultruded glass; when compression pultrusion is performed, a fabric of the required shape is pre-prepared and impregnated with resin glue, which is placed in a metal mold for heating and pressurization to obtain the R-angle mold, and the R-angle mold material is metal.

[0028] Specifically, when preparing the R angle, a milling machine processing method and a compression pultrusion molding method can be adopted.

[0029] When the mold is prepared by milling machine, the R angle mold is processed by milling machine or five-axis machine tool according to the mold parameters of the designed R angle, such as 5mm-30mm. The length of the R angle mold can be 0.1m-2m, and the width on both sides of the mold can be selected synchronously according to the size of the R angle. When the milling machine is used, the R angle mold material can be PVC, polyethylene, nylon, plastic steel, pultruded fiberglass, etc., and the R angle mold can be selectively processed and formed according to the actual situation. All surfaces of the R angle mold are smooth.

[0030] When the R-angle mold is prepared by compression pultrusion, according to the design parameters of the R-angle mold, for example, 5mm-30mm, the fabric pre-woven into the required shape is impregnated with resin glue, placed in a metal mold, heated and pressurized to form a compression pultrusion R-angle mold. The compression pultrusion R-angle mold material is metal, the R-angle mold length can be 0.1m-2m, and the width on both sides of the mold can be selected synchronously according to the size of the R angle.

[0031] Among them, in step S110, the web mold processing includes: the web mold adopts a water-heated metal mold, the starting and end areas of the mold are larger than the 500mm area of ​​the product, the allowable deviation of the product area width 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.

[0032] Specifically, when processing the web mold, the parameters such as the shape, length and width of the web are determined according to the actual project and model, and the web metal mold is made according to the parameter requirements. The form of the mold is an "I"-shaped mold. 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, and the roughness of the mold surface is less than or equal to 8um.

[0033] The axial segmentation position of the web mold is determined according to the length of the web. The steel plate profile used in the mold has sufficient strength and rigidity, and must meet the requirements of the manufacturing of FRP web products to prevent deformation and warping during production and use. The metal mold is made according to the above requirements. After the mold is installed in the factory and the vacuum pressure is qualified, the entire mold is cleaned. Use a degreased rag to clean it. After cleaning, use an oily release agent (you can also use a water-based release agent) to evenly wipe the surface of the mold product area in a spiral manner. After wiping once, wait for 10 minutes to allow the excess release agent to evaporate and form a thin film on the mold surface. Then repeat the above actions again. Wipe 3 times in total before it can be used to produce products.

[0034] Step S120, marking the positioning lines of the R-angle mold on the web mold, and bonding and fixing the R-angle mold on the web mold in sequence according to the marking line positions.

[0035] Specifically, according to the changes of different angles at different positions, an R-angle mold is prepared, and the positioning line of the R-angle mold is drawn on the prepared web mold, and the R-angle mold 1 is sequentially bonded and fixed on the web mold 2 according to the line position, such as Figure 4 As shown, the R angle can be fully formed at the corner where the web auxiliary flange and the web are connected.

[0036] Among them, step S120 includes: selecting the corresponding R-angle mold according to the position and angle change of the web flange, using a steel ruler on the inner side of the web mold flange to translate it closely to the large surface of the web to mark points and draw lines on the flange for positioning; gluing the R-angle mold to the marked line position of the web mold flange, connecting and gluing it in sequence from the blade root to the blade tip, wherein the bonded R-angle mold has a linear transition.

[0037] Specifically, prepare the web mold 2 and the required R-angle mold 1, select different R-angle molds according to the different positions and angle changes of the web steel flange, use a steel ruler on the inner side of the web mold 2 flange to move it close to the large surface of the web to mark and draw lines on the flange for positioning, and then glue the R-angle mold 1 to the marked line position of the web steel mold flange, connect and glue them in sequence from the blade root to the blade tip, and require the R-angle mold to have a linear transition on a straight line without misalignment or waves, to ensure the accuracy of the bonding position of the R-angle mold.

[0038] Step S130, 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 it to obtain a finished R-corner product.

[0039] Specifically, in order to prepare the R-corner finished product, a non-porous isolation film 3 is laid in the groove of the web mold 1, such as Figure 4 As shown, pour the pre-mixed curable material 4, such as epoxy resin, polyurethane, etc., into the groove, scrape the curing material in the groove flat, heat and fix it to obtain the R corner finished product 5, as shown in FIG. Figure 5 As shown, the preparation of the R-angle finished product is achieved, so that the R-angle forming of the web corner can be performed according to the obtained R-angle finished product.

[0040] Wherein, the curable material is silicone.

[0041] Specifically, silicone is selected as the curable material. Silicone has good high temperature resistance, can maintain its original physical properties at high temperatures, and has good weather resistance. It can resist the influence of environmental factors such as ultraviolet rays and ozone, and has a long service life.

[0042] Among them, step S130 includes: laying a non-porous isolation film in the groove of the web mold, pouring evenly stirred curable material into the groove, putting untwisted coarse yarn in the middle of the groove, and using a scraper to scrape the curable material until it is flush with the large surface of the web mold and the R-angle mold; turning on the mold heating system, heating and curing at 40-70°C, and after heating and curing for 5-8 hours, first removing the auxiliary molding R-angle mold to obtain a molded R-angle finished product.

[0043] Specifically, a non-porous isolation membrane 3 is laid firmly in the groove of the web mold 1, with no overhanging or accumulation of the non-porous isolation membrane 3, and silicone or similar curable material 4 that has been stirred evenly in advance is poured into the groove. After pouring, a scraper is used to scrape the silicone or similar curable material until it is flush with the large surface of the web and the R-angle mold 1, and 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 molding R-angle mold is first removed, and then the molded R-angle finished products 5 are taken out one by one.

[0044] In order to prevent the R-angle finished product 5 from being misaligned due to deformation, after pouring silicone or similar curable objects into the groove, 2-8 2400TEX untwisted coarse yarns can be placed in the middle to be cured together with the silicone. The R-angle finished product 5 is a whole in the length direction and cannot be disconnected in the middle. The length of the R-angle finished product can be determined according to project requirements. The general length is 20m-100m. A single set of webs needs to form 2-6 R-angle finished products.

[0045] Step S140, 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 sticking it to the large surface of the web mold.

[0046] Specifically, Figure 6 As shown, a demoulding cloth and a glass fiber cloth layer 6 are laid on the web mold 2, and the corresponding R-angle finished products 5 are placed in sequence according to the positions of the web grooves. After the R-angle finished products are placed in the grooves, they are compacted and pressed against the grooves. The glass fiber cloth layer 6 is folded over to wrap the R-angle finished products 5 and press against the large surface of the web mold 2.

[0047] Among them, step S140 includes: shaping the R-angle finished product so that the surface of the R-angle finished product has no unevenness or steps ≧2mm; laying a demoulding 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; placing the R-angle finished products in sequence and pressing them close to 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, and folding the fiberglass cloth layer to wrap the R-angle finished product and close to the large surface of the web mold.

[0048] Specifically, a utility knife or other shaping tool is used to shape the R-angle finished product mold so that the surface of the R-angle finished product has no unevenness or steps ≧2mm. After the shaping is completed, 2-4 layers of fiberglass cloth are laid close to the steel flange in the groove of the auxiliary flange area of ​​the web, and then the R-angle finished product 5 is placed in the corresponding positions in sequence. After the R-angle finished product 5 is placed in the groove, it is compacted and fits tightly to the groove without any overhead. The upper surface is flush with the large surface of the web, and there is no step at the docking position with the web, etc. Then, the required fiberglass cloth layer 6 is folded over to wrap the R-angle finished product 5 and fit the large surface of the web mold.

[0049] Step S150, laying the web structure layer, pouring and curing, and demoulding to obtain the web corner R angle.

[0050] Specifically, the web structure layer is laid according to the blade design structure, and the infusion and curing operation is performed, and finally the web corner R angle is obtained by demoulding, such as Figure 7 As shown, forming the R angle of the web corner can solve the problem of blade instability and failure caused by stress concentration or stress superposition at the web corner during blade operation, eliminate the quality risks caused by stress concentration at the web corner, thereby improving the load resistance of the blade and enhancing product safety.

[0051] Among them, step S150 includes: laying the web structure layer according to the design process, opening the vacuum pump valve to draw a vacuum, so that the first bag film is not tight after the vacuum is drawn, pressing the sealing strip position along the edge of the mold, so that the first bag film is tightly attached to the sealing strip and the mold without leakage; after the first bag film is drawn, when the vacuum pump reading is ≥83Kpa, sealing the second bag film, connecting the two layers of bag film with a guide net or breathable cotton, and the guide net or breathable cotton is laid in a Z-shaped manner to connect the front and rear edges and extend from the root of the mold to the tip of the mold; inserting a spiral steel wire tube at the injection seat, after the connection is completed, the first bag film When the reading of the internal vacuum gauge 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 pressure maintenance. The pressure maintenance rule is that the change does not exceed 15mbar within 10 minutes, 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, the Tg value and Shore hardness are measured by randomly selecting test points at the chordal position of the cross section to determine the hardness of the flange and large surface. If Tg>70℃ and Shore hardness>55HD, it is qualified, and the temperature is lowered and the mold is demolded to obtain the R angle of the web corner.

[0052] Specifically, lay out the remaining structural layers in sequence according to the design or process requirements of different projects, open the vacuum pump valve, start vacuuming, and adjust the vacuum bag film to make it close to the flange corners, runners, exhaust vacuum pipes, etc., so that the vacuum bag film is not tight after vacuuming, and press the sealing strip position along the edge of the mold to make the vacuum bag film close to the sealing strip and the mold without air leakage. After one layer of bag film is tightened, when the vacuum pump reading is ≥83Kpa, seal the second layer of 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" shape to connect the front and rear edges and extend from the root of the mold to the tip of the mold.

[0053] After sealing the two layers of bag film, insert the spiral steel wire tube into the injection seat. After the connection is completed, when the vacuum gauge reading in the first layer of bag film is less than 20mbar, close the vacuum pump and the exhaust pipeline valve of the first layer, keep all the exhaust ports open, continue to evacuate the two layers of 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 vacuum infusion can be carried out.

[0054] At the beginning of the pouring, the mold is set to 35-50℃, and after the pouring is completed, it is adjusted to 65-85℃. The temperature can be adjusted accordingly according to the local atmospheric pressure until the curing lasts for 5-8 hours. After the product surface is checked and cured, the flange and large surface hardness are tested every 5m. The cross-section chord position is randomly selected. At the same time, the Tg value is measured in accordance with the "Fiberglass and Adhesive Tg Test Specification". Tg>70℃ and Shore hardness>55HD are qualified. At the same time, the large-surface quilt of the belly plate is opened, the hot water circulation is turned off, and the cold water circulation is turned on. The upper surface temperature drops to 40℃, the temperature of the contact surface between the product and the mold drops to 50℃, and the cooling time is ≥90min before the mold can be removed.

[0055] Start the crane to move the web lifting beam tooling to the top of the web. The first lifting point should be no more than 2m away from the manual demolding point. As the rubber roller moves forward, place a sling from one side of the web flange through the lower surface to the other side every 4m. The auxiliary flange is formed in one piece. Protective tooling should be installed on the auxiliary flange at this section position. Both ends of the sling are connected to the web lifting beam tooling. The lifting height of each sling should not exceed 1.5m. Lift from the blade root to the blade tip in sequence until the web is completely demolded.

[0056] The web corner after demoulding is formed into a web corner R angle of 7. The web corner R angle effectively eliminates the stress concentration at the web corner during the operation of the blade. The web corner R angle effectively improves the load resistance of the blade and improves the safety performance of the entire blade.

[0057] In this embodiment, an R-angle mold and a web mold are prepared according to design parameters, a mold release agent is applied to the web mold, and positioning lines of the R-angle mold are drawn, and the R-angle mold is bonded and fixed to the web mold in sequence according to the line positions, a non-porous isolation film is laid in the groove of the web mold, a uniform curable material is poured into the groove and scraped flat, and the R-angle finished product is obtained by heating and curing, a mold release cloth and a glass fiber cloth layer are laid, and the R-angle finished products are placed in sequence, the glass fiber cloth layer is folded and wrapped around the R-angle finished product and adhered to the large surface of the web mold, the web structure layer is laid, infusion and curing are performed, and the web corner R-angle is obtained by demolding, which solves the problem of stress concentration or stress superposition at the web corner causing the blade to become unstable and fail, thereby avoiding local instability of the blade and improving the load resistance and safety of the entire blade.

[0058] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0059] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A blade web corner R angle forming method, characterized in that: The following steps are involved: 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 it, 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 or 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 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 includes: 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 includes: 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 draw 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 silica gel.

6. A blade web corner R angle forming method according to claim 1, characterized in that: In the step S3, it includes: Lay a non-porous isolation film in the groove of the web mold, pour a well-mixed 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 includes: 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. A blade web corner R angle forming method according to claim 1, characterized in that: In the step S5, it includes: 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 the exhaust pipeline valve, keep all the exhaust ports open, continue to evacuate the second bag film, and start to maintain the 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.

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