阅读说明：本技术 一种表面压力测量模型桨叶成型方法 (Surface pressure measurement model blade forming method ) 是由 李小敏 傅剑峰 邹海涛 李容容 陆欢 廖树根 孙志华 江春生 胡志江 白方超 杨 于 2019-10-11 设计创作，主要内容包括：本发明属于非金属复合材料制造技术,具体涉及一种表面压力测量模型桨叶成型方法；该方法首先单独成型桨叶本体和测压模块,将成型好的测压模块粘接至桨叶本体上形成模压桨叶；之后通过镗孔、安装测压块、静平衡、喷漆和打测压孔形成表面压力测量模型桨叶。本发明提出的成型方法填补了该类桨叶制造的技术空白,通过后期风洞试验结果表明桨叶表面压力测量和预估精度有了明显提高。(The invention belongs to the non-metal composite material manufacturing technology, and particularly relates to a surface pressure measurement model blade forming method; firstly, independently forming a blade body and a pressure measuring module, and adhering the formed pressure measuring module to the blade body to form a mould pressing blade; and then, forming the surface pressure measurement model blade by boring, mounting a pressure measurement block, statically balancing, spraying paint and punching a pressure hole. The forming method provided by the invention fills the technical blank of manufacturing the paddle, and the later wind tunnel test result shows that the measurement and estimation precision of the surface pressure of the paddle are obviously improved.)

1. A surface pressure measurement model blade forming method is characterized in that a blade body and a pressure measuring module are formed independently at first, and the formed pressure measuring module is adhered to the blade body to form a mould pressing blade; and then, forming the surface pressure measurement model blade by boring, mounting a pressure measurement block, statically balancing, spraying paint and punching a pressure hole.

2. The surface pressure measurement model blade forming method according to claim 1, wherein the blade body forming process is as follows: firstly, forming a built-in wire groove; then, sequentially laying a skin, a lining, a prefabricated part, a girder, foam, a built-in wire guide groove and a pressure measuring box cavity; and finally, curing at medium temperature to form the blade body, wherein the prefabricated part comprises a filling block and a plugging cover.

3. The method for forming a surface pressure measurement model blade according to claim 2, wherein the method for forming the built-in wire guide groove comprises the following steps: according to the size of the built-in wire guide groove, the paddle body forming die is utilized, aluminum plates are selected, the metal plate is formed to be in a required shape and used as a die of the internal wire guide groove, then carbon fiber cloth is laid on the forming die, vacuumizing is carried out, the carbon fiber cloth is fed into a furnace for warm curing forming, the wire guide groove is cut on the side face, epoxy glue wet forming bonding surface glass cloth is arranged after the forming die is taken out, and finally the built-in wire guide groove is obtained through curing.

4. The method as claimed in claim 2, wherein the step of co-curing is carried out by press molding.

5. The method for molding a surface pressure measurement model blade according to claim 2 or 3, wherein the medium-temperature curing parameters are as follows: the curing temperature is 125 +/-5 ℃, the curing time is 90-150 min, and the die closing gap is less than 0.1 mm.

6. The method for molding a surface pressure measurement model blade according to claim 3, wherein the epoxy adhesive curing parameters are as follows: the curing temperature is 70 +/-3 ℃, and the curing time is 2-2.5 hours.

7. The surface pressure measurement model blade forming method according to claim 1, wherein the forming process of the pressure measuring module is as follows: firstly vulcanizing and molding the rubber pad, repairing a pressure measuring capillary groove on the rubber pad, arranging a pressure measuring capillary, and finally bonding a surface skin.

8. The method for forming a surface pressure measurement model blade according to claim 1, wherein the static balance is performed by bonding a weight in the pressure cell cavity.

9. The method for forming a surface pressure measurement model blade according to claims 1, 3 and 7, characterized in that an epoxy glue, in particular a J-200-1A glue, is used for bonding.

Technical Field

The invention belongs to the non-metal composite material manufacturing technology, and particularly relates to a surface pressure measurement model blade forming method.

Background

The blade surface pressure measurement and correction method under the centrifugal force field environment in China has a large difference with foreign countries, so that the calculation and analysis of the aerodynamic load of the blade have no ideal test verification, the calculation software of the aerodynamic load of the blade cannot be effectively corrected, the development of an advanced rotor system is influenced, a novel surface pressure measurement blade is provided at present, and through the development and wind tunnel test verification, the measurement precision of the blade surface pressure in China is improved from 30% of the current error to 10%, and meanwhile, the estimation precision of the blade surface pressure in China is obviously improved.

A novel surface pressure measuring blade mainly comprises a lining, a prefabricated part (including a filling block, a blocking cover and the like), foam, a pressure measuring box cavity, a built-in wire guide groove, a skin, a girder, a pressure measuring module (including a pressure measuring capillary tube, a rubber pad and a surface skin) and the like, and the structure of the novel surface pressure measuring blade is shown in figure 1; the blade is additionally provided with the internal wire groove, the pressure measuring box cavity, the pressure measuring block, the pressure measuring module and other structures, so that the forming difficulty of the blade is greatly increased.

Disclosure of Invention

The purpose of the invention is as follows: a method for forming a surface pressure measuring blade is provided to solve the problem that the blade structure is difficult to form.

The technical scheme of the invention is as follows: a surface pressure measurement model blade forming method comprises the steps of firstly, independently forming a blade body and a pressure measuring module, and adhering the formed pressure measuring module to the blade body to form a mould pressing blade; and then, forming the surface pressure measurement model blade by boring, mounting a pressure measurement block, statically balancing, spraying paint and punching a pressure hole.

The blade body forming process comprises the following steps: firstly, forming a built-in wire groove; then, sequentially laying a skin, a lining, a prefabricated part (including a filling block, a plugging cover and the like), a girder, foam, a built-in wire guide groove and a pressure measuring box cavity; and finally, curing and forming the blade body.

The forming method of the built-in wire groove comprises the following steps: according to built-in metallic channel size, utilize paddle body forming die, select for use the aluminium sheet metal working shaping to go out the appearance of needs, as the mould of inside metallic channel, then lay carbon cloth on the mould, the warm solidification shaping in the stove is advanced in the evacuation, cuts the metallic channel in the side, disposes epoxy glue wet process shaping bonding surface glass cloth after taking out the mould, solidifies once more and obtains built-in metallic channel.

The molding process of the pressure measuring module comprises the following steps: firstly vulcanizing and molding the rubber pad, repairing a pressure measuring capillary groove on the rubber pad, arranging a pressure measuring capillary, and finally bonding a surface skin.

The invention has the beneficial effects that: the forming method provided by the invention fills the technical blank of manufacturing the paddle, and the later wind tunnel test result shows that the measurement and estimation precision of the surface pressure of the paddle are obviously improved.

Drawings

Figure 1 is a schematic view of a surface pressure measuring blade structure,

figure 2 is a schematic view of a blade body forming process,

figure 3 is a schematic view of a surface pressure measuring blade forming process,

figure 4 is a flow chart of an embodiment of the present invention,

fig. 5 is a schematic view of a mold for forming a built-in wire guide groove.

Description of numbering: (1) the device comprises a rear upper/lower connector filling block, (2) a middle filling block, (3) a blocking cover, (4) a lining, (5) a front upper/lower connector filling block, (6) a crossbeam, (7) foam, (8) a built-in wire guide, (9) a pressure measuring module, (10) a pressure measuring box cavity, (11) a pressure measuring block and (12) a cover plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the present invention provides a surface pressure measuring blade, which comprises a rear upper/lower joint filling block, a middle filling block, a cap, a bushing, a front upper/lower joint filling block, a girder, foam, a built-in wire guide, a pressure measuring module, a pressure measuring box cavity, and a pressure measuring block.

The invention provides a forming method applied to the blade, the flow of the method is shown in figure 4, firstly, a blade body and a pressure measuring module are respectively formed, and the formed pressure measuring module is adhered to the blade body to form a mould pressing blade; and then, forming the surface pressure measurement model blade by boring, mounting a pressure measurement block, statically balancing, spraying paint and punching a pressure hole.

In the specific implementation process of the method, the blade body can be formed by the following process;

1) blade body forming

Firstly, forming a built-in wire groove, wherein the cross section of the wire groove is designed to be 17 multiplied by 2mm, and then embedding the formed built-in wire groove in foam; then, lay assemblies such as covering, bush, prefab (including filling block, blanking cover etc.), girder, foam, pressure measurement box cavity in proper order, use the mould pressing co-curing to form out the blade body at last, the solidification parameter of selection is: the curing temperature is 125 +/-5 ℃, the curing time is 90-150 min, and the mold closing gap is required to be less than 0.1 mm; the curing parameters can better ensure the curing quality of the blade.

The forming process of the built-in wire guide groove in the paddle body mainly comprises the steps of utilizing a paddle body forming die according to the size of the built-in wire guide groove, selecting an aluminum plate with the thickness of 2mm and the width of 17mm and the brand number of LY12, forming a required shape by a metal plate to serve as a die of the internal wire guide groove, laying 2 layers of carbon fiber cloth on the forming die, vacuumizing, feeding the carbon fiber cloth into a furnace for warm curing and forming, cutting the wire guide groove on the side surface, taking out the forming die, configuring an epoxy glue wet forming station to bond a layer of surface glass cloth, and curing again; the curing parameters at this time were: the curing temperature is 70 +/-3 ℃, and the curing time is 2-2.5 hours; the curing quality is ensured.

In the blade forming method, the pressure measuring module is a main component, and the forming process can adopt the following method;

2) pressure measuring module forming

Vulcanizing and molding a rubber pad, repairing a pressure measuring capillary groove on the rubber pad, arranging a pressure measuring capillary, and finally bonding a surface skin; adopting epoxy glue for bonding; at the moment, the curing parameter is 70 +/-3 ℃, and the temperature is kept for 2-2.5 hours; the bonding strength is ensured.

In the blade forming method, the pressure measuring module and the blade body are bonded to form the molded blade, and finally the molded blade is detected, wherein the specific implementation process is as follows;

3) molding of molded blades

The pressure measuring module is adhered to the blade body by the epoxy glue, and the blade appearance is ensured by controlling the glue consumption through pressurization in a vacuumizing mode. And (3) detecting the appearance, the size, the X-ray, the knocking and the like of the molded blade after the molded blade is formed.

In the concrete implementation process of the method, the surface pressure measurement model blade can be formed by adopting the following process;

4) shaping of model blades

The molded blade is subjected to hole boring, pressure measuring block mounting, paint spraying, static balancing and punching after being molded, and because the molded blade does not contain a counterweight support, the static balancing counterweight of the blade is completed by bonding a counterweight block in a pressure measuring box cavity, and after the counterweight is completed, a pressure hole is drilled on a blade pressure measuring capillary tube by an electric drill.

In the implementation process of the method, the epoxy glue is J-200-1A glue, and the glue is verified by a bonding identification test of a certain type of blade and a rubber pad, so that the bonding strength of the rubber pad and the blade body can be ensured, and the centrifugal force borne by the blade in the blade test can be borne.

The foregoing is merely a detailed description of the embodiments of the present invention, and some of the conventional techniques are not detailed. The scope of the present invention is not limited thereto, and any changes or substitutions that can be easily made by those skilled in the art within the technical scope of the present invention will be covered by the scope of the present invention. The protection scope of the present invention shall be subject to the protection scope of the claims.