[0030]The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
[0031]SeeFigure 1-Figure 4 , A wind power ring blank for reducing stress concentration, comprising a ring body 1 and an inner sleeve 2. The inner sleeve 2 is assembled on the inner side of the ring body 1, and the connection between the inner sleeve 2 and the inner wall of the ring body 1 is Interference fit, so that the assembled wind turbine ring blanks are more closely connected. The inner sleeve 2 is provided with evenly distributed tooth slots 21. The tooth slots 21 are used to connect other workpieces. The edge of the inner sleeve 2 is limited. Position ring 22, the limit ring 22 is provided with evenly distributed positioning holes 221, the positioning holes 221 are located above the first threaded hole 12, and when the inner sleeve 2 is assembled to the inner side of the ring body 1, the positioning holes 221 need to be ensured Match with the first threaded hole 12, and then install a locking bolt at the positioning hole 221, and at the same time, the locking bolt is connected to the first threaded hole 12, so as to ensure the tightness of the connection between the wind turbine ring blanks and effectively reduce the stress Concentration, the limit ring 22 is in contact with the wall of the ring body 1, and the inner and outer edges of the ring body 1 are chamfered, which can effectively reduce stress concentration. The upper and lower surfaces of the ring body 1 are provided with position indicating grooves 11. The position-indicating groove 11 is used to indicate the position and facilitate subsequent installation. The upper surface of the ring body 1 is provided with a first threaded hole 12 and a second threaded hole 13, and the upper surface of the ring body 1 is provided with a stepped ring groove 14. A threaded hole 12 is arranged on the stepped ring groove 14, and the stepped ring groove 14 is in contact with the limit ring 22; the stress concentration of the entire wind power ring blank after installation is significantly reduced compared with traditional parts. The wind power ring blank is made of The ring main body 1 and the inner sleeve 2 are composed. The inner sleeve 2 is connected to the ring main body 1 by interference fit while ensuring the matching of the positioning hole 221 with the first threaded hole 12, and then a locking bolt is installed at the positioning hole 221, At the same time, the locking bolt is connected to the first threaded hole 12, so as to ensure the tightness of the connection of the wind turbine ring blank, and at the same time can effectively reduce the stress concentration.
[0032]SeeFigure 5 , A preparation process of wind power ring blanks with reduced stress concentration, including the following steps:
[0033]The first step: prepare the ring body 1 and the inner sleeve 2 blanks, in which C, Mn, Cr, Si, Mo, V, Fe, Ni and other materials are mixed according to the proportions and then poured into a smelting furnace at a temperature of 1550°C. The molten steel is then poured into the ring body 1 and the inner sleeve 2 blanks. At this time, the ring body 1 and inner sleeve 2 blanks are extremely hot, and the subsequent operation safety needs to be ensured;
[0034]Step 2: Carry out rough turning of the ring body 1 and inner sleeve 2 blanks. Before rough turning, it is necessary to ensure that the ring body 1 and inner sleeve 2 blanks have been cooled to avoid safety accidents caused by high temperature. According to the design It is required to clamp and align the blank of the ring body 1, process the position indicating groove 11, the threaded hole and the step ring groove 14 on the end surface of the ring body 1, and perform chamfering at the edge of the end surface, and according to the design requirements Drilling and grooving the inner sleeve 2. When rough turning the ring body 1, chamfering is also required, which can further reduce stress concentration;
[0035]The third step: quenching and tempering, that is, first quenching and then high temperature tempering. After quenching and tempering, the ring body 1 and inner sleeve 2 blanks have higher strength, and have excellent toughness, plasticity, and cutting performance. , Put the ring body 1 and the inner sleeve 2 blanks in a vacuum furnace for vacuum quenching. The vacuum quenching temperature is maintained at 850℃-900℃. The quenching medium for vacuum quenching is inert gas. The ring body 1 and the ring body 1 and The inner sleeve 2 blank is placed in the tempering furnace for high-temperature tempering. The high-temperature tempering temperature is controlled within the range of 350℃-400℃. The humidity of the ring main body 1 and inner sleeve 2 is less than 50% during high-temperature tempering. The vacuum degree is less than 10pa. When the ring body 1 and inner sleeve 2 blanks are at a temperature of 850℃-900℃, the metallographic phase of the ring body 1 and inner sleeve 2 blanks is austenite. After quenching, the austenite transforms into horse The blanks of the main body 1 and inner sleeve 2 of the cutter ring are then treated with high temperature tempering in the range of 350℃-400℃, which can improve the rigidity and hardness of the blanks of the main body 1 and inner sleeve 2 And resilience;
[0036] The fourth step: finishing. According to the size requirements, the quenched and tempered ring body 1 and the inner sleeve 2 blanks are processed twice to ensure the tolerance and roughness requirements of the corresponding size, because in the process of heat treatment, the ring The body 1 and inner sleeve 2 blanks will undergo slight thermal deformation. Finishing can ensure the size of the ring body 1 and inner sleeve 2 blanks to meet the processing size requirements. The surface of the ring body 1 is rough after finishing and heat treatment The degree should be less than 1.5 microns, so as to reduce the smooth running of the parts;
[0037]The fifth step: stress relief annealing, put the quenched and tempered inner sleeve 2 blank in the stress relief annealing device for stress relief annealing, and the temperature is controlled at 300-400 degrees Celsius, which can eliminate stress and ensure the inner sleeve 2 Hardness, stress relief annealing can eliminate stress, can prevent the tooth groove 21 on the inner sleeve 2 from cracking, because the workpiece will have a large residual stress during quenching, which is easy to cause deformation of the workpiece, so annealing can effectively reduce the residual stress and temperature control At 300-400 degrees Celsius, this can eliminate stress and ensure the hardness of the inner sleeve 2;
[0038]The sixth step: natural cooling, the inner sleeve 2 blank after the stress relief annealing process is placed in ambient temperature to cool naturally, the hardness value of the inner sleeve 2 after natural cooling should be HRC50-55, which meets the practical needs of wind power;
[0039]Step 7: Assemble the inner sleeve 2. Place the ring body 1 in a predetermined installation position, where the side with threaded holes on the ring body 1 is facing upwards, and then the inner sleeve 2 is lifted by a hoisting device, and the inner sleeve The sleeve 2 is hoisted into the liquid nitrogen silo. The liquid nitrogen cools the inner sleeve 2 at ultra-low temperature. The ultra-low temperature cooling time is 15-20 minutes. Then, the inner sleeve 2 after the ultra-low temperature treatment is installed on the inner side of the ring body 1, and the inner sleeve 2 and the ring The connection between the inner walls of the main body 1 is interference fit, so that the assembled wind power ring blanks are more closely connected;
[0040]Step 8: Lock the inner sleeve 2. After the inner sleeve 2 is assembled, install the locking bolt into the positioning hole 221 and the first threaded hole 12, and at the same time, the locking bolt is connected to the first threaded hole 12 to ensure the wind power ring The connection tightness of the blank parts can effectively reduce the stress concentration.
[0041]The wind power ring blank for reducing stress concentration and its preparation process. The wind power ring blank includes a ring main body 1 and an inner sleeve 2. The inner sleeve 2 is assembled on the inner side of the ring main body 1, and the inner sleeve 2 and the ring main body 1 The inner wall of the inner wall is connected by interference fit, so that the assembled wind turbine ring blanks are more closely connected. The inner sleeve 2 is provided with evenly distributed tooth grooves 21, and the edge of the inner sleeve 2 is provided with a limit ring 22. The limit ring 22 is provided with evenly distributed positioning holes 221. The positioning holes 221 are located above the first threaded hole 12. When the inner sleeve 2 is assembled to the inner side of the ring body 1, it is necessary to ensure that the positioning holes 221 and the first thread The hole 12 is matched, and then a locking bolt is installed at the positioning hole 221. At the same time, the locking bolt is connected to the first threaded hole 12, so as to ensure the tightness of the connection of the wind turbine ring blank, and effectively reduce the stress concentration. The inner and outer edges of the main body 1 are chamfered, which can effectively reduce the stress concentration. After the installation of the entire wind power ring blank, the stress concentration is significantly reduced compared with the traditional parts. The preparation process includes the following steps: first prepare the ring body 1 and inner sleeve 2 blanks, and then rough-turn the ring body 1 and inner sleeve 2 blanks, and then perform quenching and tempering, that is, quenching and then high temperature tempering, After quenching and tempering, the ring body 1 and inner sleeve 2 blanks have higher strength, excellent toughness, plasticity, and cutting performance, and then finish machining, because in the process of heat treatment, the ring body 1 and inner sleeve The blank of sleeve 2 will be slightly thermally deformed, and the size of the ring body 1 and inner sleeve 2 can be guaranteed by finishing to meet the processing size requirements, and then stress relief annealing is performed on the inner sleeve after quenching and tempering. 2 The blank is placed in a stress-relieving annealing device for stress-relieving annealing. Because the workpiece will have a large residual stress during quenching, which is easy to cause deformation of the workpiece, annealing can effectively reduce the residual stress, which can eliminate stress and ensure the inner sleeve 2 Hardness, then natural cooling and assembly of the inner sleeve 2. The connection between the inner sleeve 2 and the inner wall of the ring body 1 is interference fit, so that the assembled wind turbine ring blanks are more closely connected. After the inner sleeve 2 is assembled , The locking bolt is installed in the positioning hole 221 and the first threaded hole 12, and the locking bolt is connected to the first threaded hole 12, so as to ensure the tightness of the connection of the wind turbine ring blanks and effectively reduce the stress concentration.
[0042]In summary, in the wind power ring blank for reducing stress concentration and its preparation process proposed by the present invention, the connection between the inner sleeve 2 and the inner wall of the ring body 1 is interference fit, so that the assembled wind power ring The blanks are connected more closely. The positioning holes 221 match the first threaded holes 12, and the locking bolts installed at the positioning holes 221 ensure the tightness of the connection between the wind power ring blanks and effectively reduce stress concentration. When preparing the parts, first prepare the ring body 1 and inner sleeve 2 blanks, and then rough-turn the ring body 1 and inner sleeve 2 blanks, then perform quenching and tempering treatment, then perform finishing, and then perform stress relief annealing on them , Stress-relief annealing can eliminate the stress and ensure the hardness of the inner sleeve 2, and then cool naturally and assemble the inner sleeve 2. The interference fit makes the connection of the wind power ring blanks closer. The whole wind power ring blanks are installed compared to traditional parts The stress concentration phenomenon is obviously reduced, the strength is high, and the preparation process of the wind power ring blank is relatively simple.
[0043]It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply one of these entities or operations. There is any such actual relationship or order between. Moreover, the terms "include", "include" 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 not only includes those elements, but also includes those that are not explicitly listed Other elements of, or also include elements inherent to this process, method, article or equipment.
[0044]The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited to this. Anyone familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solution of the present invention Equivalent replacements or changes to its inventive concept should all fall within the protection scope of the present invention.
