Wind power bull gear closed die forging die with lightening holes

Abstract

The utility model relates to a wind power bull gear closed die forging die with lightening holes. The wind power bull gear closed die forging die comprises a cake upsetting die and a die forging die, the cake upsetting die is composed of an upsetting lower flat plate die, an upsetting upper flat plate die and a cake upsetting ring sleeve. The upsetting cake ring sleeve is arranged at the top of the upsetting lower flat plate die, and the upsetting upper flat plate die is arranged above the upsetting cake ring sleeve; the die forging die comprises an upper base plate and a lower base plate which correspond vertically, a lower die sleeve is fixed to the top of the lower base plate, a lower circular plate is arranged in the lower die sleeve, and a lower punch and a lower spoke die are arranged in the center of the top of the lower circular plate. An upper circular plate is arranged at the bottom of the upper base plate, and an upper punch and an upper spoke die are fixed to the bottom of the upper circular plate. And a lightening hole forming upper die is arranged in the lower die sleeve. The wind power bull gear closed die forging die with the lightening holes is high in forge piece precision, small in follow-up machining allowance and high in material utilization rate of gear forge pieces, production and machining cost is reduced, and machining efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a wind turbine gear forging die, especially to a wind power large gear closed die forging die with weight reduction holes. BACKGROUND

[0002] The wind turbine is a device for converting wind energy into electric energy, mainly composed of blades, generators, mechanical parts and electrical parts. The fan blades are connected to the universal elastic coupling through the gear box and its high-speed shaft, and the torque is transmitted to the drive shaft of the generator for power generation. The size of the wind turbine varies, and according to different application environments, the offshore wind power is currently more commonly used. The wind turbine is huge in size, and it mainly uses traditional gear transmission. For such large wind turbines, the size of the structural components is also very large, especially the gear components. The gear of such a wind turbine is relatively large and is usually processed by casting or die forging process. However, the strength of the forging process is not high, therefore, in order to ensure the durability of the equipment, the gears used in the wind turbine are mainly processed by die forging.

[0003] Generally, the gear includes a tooth surface, a spoke and a shaft hole. The tooth surface is processed by lathe turning after die forging, while the spoke and the shaft hole need to be die forged to have a basic contour shape for subsequent turning finishing. However, the size of the die forged wind power gear is much larger than that of the finished gear, and a large amount of excess material needs to be turned off after forging, which increases the processing cost of the product. In order to reduce the weight of the gear while ensuring its strength, the conventional method is to open a process hole, usually called a weight reduction hole, on the spoke surface of the gear, which ensures the structural strength of the gear. However, the machining of the weight reduction hole on the wind power gear is carried out by drilling and opening the hole on the machine after the gear forging is completed and the rough and tight machining of the wind power gear is carried out, which takes a long time and wastes materials, affecting the processing efficiency and increasing the production and processing cost of the wind power gear. SUMMARY

[0004] The technical problem to be solved by the utility model is to provide a wind power large gear closed die forging die with weight reduction holes that can process less excess material and improve processing efficiency.

[0005] In order to solve the above technical problems, the utility model is realized by the following technical scheme:

[0006] A closed-type forging die for a wind turbine large gear with a weight-reducing hole includes an upsetting die for upsetting a billet into a disc and a forging die forging the disc into a finished forging with a weight-reducing hole. The upsetting die consists of a lower upsetting plate die, an upper upsetting plate die, and an upsetting ring. The upsetting ring is disposed on top of the lower upsetting plate die, and has an upsetting cavity that is vertically connected at its center. The billet is placed in the upsetting cavity. The upper upsetting plate die is vertically movable and disposed above the top of the upsetting ring, corresponding vertically to the billet placed in the upsetting ring. The forging die includes an upper backing plate and a lower backing plate that are vertically corresponding. A lower die sleeve is fixed to the top of the lower backing plate. The upper plate has a centrally located, vertically connected mold cavity. Inside the mold cavity, on the top surface of the lower base plate, is a lower circular plate. A lower punch, fixedly connected to the top center of the lower circular plate, is located at the center of the lower circular plate. A lower wheel spoke die is located on the outer side of the lower circular plate and is fixedly connected to the lower circular plate. The blank is placed inside the mold cavity at the top of the lower punch. At the bottom of the upper base plate, an upper circular plate with an outer diameter matching the mold cavity diameter is located. An upper punch is fixedly connected to the center of the bottom of the upper circular plate, and the upper punch corresponds vertically to the lower punch. At the bottom of the upper circular plate, outside the upper punch, is an upper wheel spoke die fixedly connected to the upper punch, and the upper wheel spoke die corresponds vertically to the lower wheel spoke die.

[0007] Furthermore, a weight-reducing hole forming upper mold is provided at the top of the blank in the mold cavity. The outer diameter of the weight-reducing hole forming upper mold matches the diameter of the mold cavity. Its bottom has a downwardly protruding shaping block and a spoke module. The shaping block and the spoke module correspond to the upper punch and the upper spoke mold, respectively, and the contour structure of the shaping block and the spoke module is the same as the contour structure of the upper punch and the upper spoke mold, respectively. A downwardly protruding weight-reducing hole module is provided at the bottom center of the spoke module.

[0008] Furthermore, the top of the weight-reducing hole forming upper die is provided with punch insertion holes and wheel spoke die insertion grooves that correspond to and are embedded in the upper punch and upper wheel spoke die respectively.

[0009] Furthermore, the lower punch has a concave cavity at its top center, and a top head that is embedded within the cavity is provided therein. The top surface of the top head placed in the cavity is flush with the top surface of the lower punch. The bottom center of the cavity has a discharge hole that penetrates downward through the lower punch, the lower circular plate, and the lower pad plate. A push rod that is clearance-fitted within the discharge hole is provided therein, and the top of the push rod is fixedly connected to the bottom center of the top head.

[0010] Furthermore, the top of the lower circular plate is provided with a lower center groove for facilitating the positioning of the lower punch and a lower positioning groove for facilitating the positioning of the lower wheel spoke die; the bottom of the upper circular plate is provided with an upper center groove for facilitating the positioning of the upper punch and an upper positioning groove for facilitating the positioning of the upper wheel spoke die.

[0011] Further, the lower base plate top center is provided with a centering groove, and the lower die sleeve bottom is provided with a centering protrusion matched with the centering groove.

[0012] Further, the position of the inner wall surface of the mold cavity close to the bottom is a slope inclined to the outside of the bottom.

[0013] Compared with the prior art, the wind power gear finished forging precision is relatively high, the size is close to the size of the finished gear, the subsequent machining allowance is small, the weight-reducing hole on the gear can be basically formed during die forging, the subsequent machine processing amount is reduced, the material utilization rate of the gear forging is high, the production and processing cost is reduced, and the processing efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0015] Figure 1 is a structure schematic diagram of the upsetting process of the upsetting die in the closed die forging die for the wind power gear with the weight-reducing hole of the present application;

[0016] Figure 2 is a structure schematic diagram of the forging process of the semi-finished forging without the weight-reducing hole in the die forging die in the closed die forging die for the wind power gear with the weight-reducing hole of the present application;

[0017] Figure 3 is a structure schematic diagram of the forging process of the finished forging with the weight-reducing hole in the die forging die in the closed die forging die for the wind power gear with the weight-reducing hole of the present application;

[0018] Figure 4 is a structure schematic diagram of the weight-reducing hole forming upper die in the die forging die of the present application.

[0019] In the figure: 1, upsetting die; 11, upsetting lower flat die; 12, upsetting upper flat die; 13, upsetting ring sleeve; 131, upsetting cavity; 2, blank; 21, cake blank; 22, semi-finished forging; 23, finished forging; 3, die forging die; 31, lower pad; 311, material removal hole; 312, ejector rod; 313, ejector head; 314, centering groove; 32, upper pad; 33, lower die sleeve; 331, die cavity; 332, centering protrusion; 34, lower circular plate; 341, lower punch; 3411, lower centering groove; 3412, cavity; 342, lower spoke die; 3421, lower positioning groove; 35, upper circular plate; 351, upper punch; 3511, upper centering groove; 3512, upper positioning groove; 352, upper spoke die; 36, weight-reducing hole forming upper die; 361, punch hole; 362, spoke die slot; 363, shaping block; 364, spoke die block; 365, weight-reducing hole block. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will be a clear and complete description of the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application. It should be noted that similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In the description of the embodiments of the present application, it should be noted that if the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, or are the orientations or positional relationships of the present application product when it is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore, cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore, cannot be understood as limiting the present application. In addition, the terms "first", "second", etc. are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0022] In addition, if the terms "horizontal", "vertical" and the like appear, it does not mean that the component must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure or component must be completely horizontal, but can be slightly inclined.

[0023] In the description of the embodiments of the utility model, "multiple" represents at least 2.

[0024] In the description of the embodiments of the utility model, it also needs to be explained that, unless there is explicit provision and limitation, if the terms "set", "install", "connect", "connect" appear, it should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or integrally connected. It can be mechanically connected, or it can be electrically connected. It can be directly connected, or it can be indirectly connected through an intermediate medium. It can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0025] Embodiments

[0026] Please refer to the drawings in the description Figures 1-3 The drawings in the description Figures 1-3 The specific process flow of the closed die forging die of the wind power large gear with weight reduction hole, the closed die forging die of the wind power large gear with weight reduction hole comprises an upsetting cake die 1 for upsetting a blank 2 into a cake blank 21 and a die forging die 3 for die forging the cake blank 21 into a finished forging 23 with weight reduction hole. The blank can be a bar or a flat cake blank. The upsetting cake die 1 and the die forging die 3 are used with a die forging hydraulic machine for processing large wind power gears. Refer to the drawings in the description Figure 1As shown, the upsetting die 1 is composed of an upsetting lower flat die 11, an upsetting upper flat die 12 and an upsetting ring 13; the upsetting ring 13 is installed on the top of the upsetting lower flat die 11, and the center of the upsetting ring 13 is provided with an upsetting cavity 131 which is communicated with the upper and lower portions, the blank 2 is placed in the upsetting cavity 131, the top surface of the upsetting flat die 12 is horizontal, and it is fixedly installed on the lower die plate of the die forging hydraulic machine, the bottom surface of the upsetting upper flat die 12 is horizontal, and it is fixedly installed on the bottom of the upper die plate of the die forging hydraulic machine, the die forging hydraulic machine drives the upper die plate to drive the upsetting upper flat die 12 to move up and down, the upsetting upper flat die 12 is located above the top of the upsetting ring 13, and the upsetting upper flat die 12 corresponds to the blank 2 placed in the upsetting ring 13, the die forging hydraulic machine drives the upsetting upper flat die 12 to move downward to press the blank 2 placed in the upsetting cavity 131 after being heated, so that the blank is upset to be the pie blank 21 which is consistent with the upsetting cavity 131, in order to facilitate the blank 21 to be discharged, the wall surface of the upsetting cavity 131 is inclined, the top diameter of the upsetting cavity 131 is smaller than the bottom diameter, the inclination angle of the upsetting cavity 131 is 4°, and the pie blank 21 after being upset is conveniently demoulded from the upsetting cavity 131; refer to the drawings Figure 2As shown, the die forging die 3 comprises upper and lower corresponding upper and lower pads 32 and 31, the upper pad 32 is fixedly installed on the upper die plate of the die forging hydraulic machine through bolts, the lower pad 31 is fixedly installed on the lower die plate of the die forging hydraulic machine through bolts, the top of the lower pad 31 is fixed with a lower die sleeve 33, the center of the lower die sleeve 33 is provided with an upper and lower communicating die cavity 331, in order to facilitate the quick installation of the lower die sleeve 33 on the lower pad 31, and to ensure the accuracy of the installation position of the lower die sleeve 33 on the top of the lower pad 31, the top center of the lower pad 31 is provided with a centering groove 314, which is used for quick centering of the lower die sleeve 33 on the lower pad 31, to ensure the accuracy of the installation position, in order to facilitate the embedding and inserting cooperation with the centering groove 314, the bottom of the lower die sleeve 33 is provided with a centering protrusion 332 which is matched with the centering groove 314, during installation, the centering protrusion 332 at the bottom of the lower die sleeve 33 is embedded with the centering groove 314, and the bottom of the lower die sleeve 33 is fixedly connected with the lower pad 32 through bolts; the lower circular plate 34 is arranged on the top surface of the lower pad 31 in the die cavity 331; in order to avoid the lower circular plate 34 moving upward along the die cavity 331 with the forged piece during demolding, affecting demolding, the position close to the bottom of the inner wall surface of the die cavity 331 is inclined to the outside of the bottom, the outer contour of the lower circular plate 34 matches the contour shape of the wall surface close to the bottom in the die cavity 331, and the lower circular plate 34 can be limited in height and horizontal position after the lower die sleeve 33 is fixedly installed on the lower pad 31; the top center of the lower circular plate 34 is provided with a lower punch 341 fixedly connected therewith, the lower punch 341 is arranged at the central part of the lower circular plate 34 and is used for die forging forming of the shaft hole of the center of the wind power gear, the outer side of the lower punch 341 is provided with a lower spoke die 342, which is used for forming processing of the spoke on one side of the wind power gear, the lower spoke die 342 is fixedly connected on the lower circular plate 34, in order to facilitate quick installation and accurate positioning of the lower punch 341 and the lower spoke die 342 on the lower circular plate 34, the top of the lower circular plate 34 is provided with a lower centering groove 3411 for positioning the lower punch 341 and a lower positioning groove 3421 for positioning the lower spoke die 342, the lower punch 341 and the lower spoke die 342 are fixedly connected on the lower circular plate 34 through bolts; the cake blank 21 is placed in the die cavity 331 at the top of the lower punch 341; in order to facilitate the demolding of the forged piece, the top center of the lower punch 341 is provided with a concave cavity 3412, the cavity 3412 is provided with a top head 313 matched therewith in an embedded manner, the top surface of the top head 313 placed in the cavity 3412 is flush with the top surface of the lower punch 341, and the top head 313 can move up and down;In order to realize the up and down movement of the fixed die 313, the bottom center of the cavity 3412 is provided with a material return hole 311 which penetrates through the lower punch 341, the lower disc 34 and the lower pad 31 downward, and which corresponds to the material return mechanism of the die forging hydraulic press upward and downward, the material return hole 311 is provided with a ejector rod 312 which is matched with the gap therebetween, the top of the ejector rod 312 is fixedly connected with the bottom center of the ejector head 313, and is threadedly connected therebetween, so that the ejector rod 312 and the ejector head 313 can be conveniently disassembled, the bottom of the ejector rod 312 is fixedly connected with the material return mechanism of the die forging hydraulic press, the material return mechanism can drive the ejector rod 313 to move upward and downward, so as to realize the up and down movement of the fixed die 313, and facilitate the demolding of the forgings on the top of the fixed die 313; the bottom of the upper pad 32 is provided with an upper disc 35 which has an outer diameter matched with the diameter of the cavity 331, the upper disc 35 can enter the cavity 331 downward, the bottom center of the upper disc 35 is fixedly provided with an upper punch 351, the upper punch 351 and the upper disc 35 are fixedly connected together through bolts, the upper punch 351 corresponds to the lower punch 341 upward and downward, and is used for the die forging forming of the shaft hole in the center of the wind power gear; the outer side of the bottom of the upper disc 35 which is located outside the upper punch 351 is provided with an upper spoke die 352 which is fixedly connected with the upper disc 35, the upper spoke die 352 is fixedly connected with the upper disc 35 through bolts, the upper spoke die 352 corresponds to the lower spoke die 342 upward and downward, and is used for the forming processing of the spokes on one side of the wind power gear; in order to facilitate the quick installation and accurate positioning of the upper punch 351 and the upper spoke die 352 on the upper disc 35, the bottom of the upper disc 35 is provided with an upper centering groove 3511 which facilitates the positioning of the upper punch 351 and an upper positioning groove 3512 which facilitates the positioning of the upper spoke die 352, the upper punch 351 and the upper spoke die 352 are fixedly connected with the upper disc 35 through bolts.

[0027] In order to die forge the weight-reducing holes on the spokes of the gear forgings, referring to the drawings Figure 3 In order to die forge the weight-reducing holes on the spokes of the gear forgings, referring to the drawings Figure 4As shown, the outer diameter of the weight-reducing hole forming upper die 36 is consistent with the diameter of the die cavity 331, the top of the weight-reducing hole forming upper die 36 is provided with punch embedding hole 361 and spoke die embedding groove 362 corresponding to the upper punch 351 and upper spoke die 352 respectively, the upper punch 351 and upper spoke die 352 can enter the corresponding punch embedding hole 361 and spoke die embedding groove 362 respectively when they are downward, which is convenient for positioning the weight-reducing hole forming upper die 36, the punch embedding hole 361 and spoke die embedding groove 362 have a 1mm gap between the corresponding upper punch 351 and upper spoke die 352, which is convenient for the upper punch 351 and upper spoke die 352 to separate from the weight-reducing hole forming upper die 36 after the forging is finished; the bottom of the weight-reducing hole forming upper die 36 has downward protruding shaping block 363 and spoke die block 364, the shaping block 363 and spoke die block 364 correspond to the upper punch 351 and upper spoke die 352 respectively, and the contour structure of the shaping block 363 and spoke die block 364 is the same as that of the upper punch 351 and upper spoke die 352 respectively, which can ensure that the concave cavity structure of the semi-finished forging 22 after the upper punch 351 and upper spoke die 352 die forging forming will not be deformed due to weight-reducing hole processing; the bottom center of the spoke die block 364 is provided with a downward protruding weight-reducing hole block 365, and the width of the weight-reducing hole block 365 is less than that of the spoke die block 364; only unilateral weight-reducing hole forming upper die 36 is used in this embodiment, which avoids the time-consuming replacement of the lower die sleeve and the problem of temperature reduction of the to-be-formed forging which cannot be formed.

[0028] The specific working principle is as follows: first, upsetting, referring to the upsetting ring sleeve 13 in the accompanying drawings of the specification Figure 1 As shown: the heated blank 2 is placed in the upsetting cavity 131 of the upsetting ring sleeve 13, and the upsetting upper flat die 12 is pressed down to avoid contact between the blank 21 and the upsetting cavity 131; second, die forging, referring to the die forging in the accompanying drawings of the specification Figure 2 As shown: the blank 21 is placed in the die cavity 331 of the lower die sleeve 33, and the outer diameter of the blank 21 is consistent with the diameter of the die cavity 331, which is automatically centered by its own outer diameter, the die forging hydraulic press drives the upper die plate 32 downward through the upper die plate, and the upper die plate 32 drives the upper punch 351 and the upper spoke die 352 fixed at the bottom of the upper circular plate 35 downward synchronously, which cooperates with the lower punch 341 and the lower spoke die 342 to press the blank 21 in the die cavity 331 into a semi-finished forging 22 without weight-reducing hole; third, die forging weight-reducing hole, referring to the die forging weight-reducing hole in the accompanying drawings of the specification Figure 3As shown, after the second step, the upper die, i.e. the upper round plate 35 connected to the upper base plate 32 and the upper punch 351 and the upper spoke die 352 at the bottom of the upper round plate 35, is lifted, the weight-reducing hole forming upper die 36 is put into the die cavity 331 of the lower die sleeve 33 by the manipulator, the weight-reducing hole forming upper die 36 is centered by the outer diameter of the die cavity 331 of the lower die sleeve 33, the die hydraulic press drives the upper base plate 32 downward by the upper die plate, the upper base plate 32 drives the upper round plate 35 and the upper punch 351 and the upper spoke die 352 at the bottom of the upper round plate 35 downward, the upper punch 351 and the upper spoke die 352 are pressed into the punch embedding hole 361 and the spoke die embedding 362 respectively, the weight-reducing hole forming upper die 36 is driven to press downward, the weight-reducing hole module 365 at the bottom of the weight-reducing hole forming upper die 36 forms the weight-reducing hole on the spoke of the semi-finished forging 22 through the weight-reducing hole forming upper die 36 to produce the finished forging 23, the finished forging 23 is pressed and formed, the finished forging 23 is lifted by the ejector rod 312 and the ejector head 313 to a position where the upper surface of the finished forging 23 is higher than the upper surface of the lower die sleeve 33, then the weight-reducing hole forming upper die 36 is clamped by the manipulator and separated from the finished forging 23 by the friction between the lower die sleeve 33 and the outer circle of the finished forging 23, then the finished forging 23 is integrally ejected to realize the demolding of the finished forging 23.

[0029] The closed die forging die for the wind power gear with weight-reducing holes adopts the spoke weight-reducing hole forming process in steps, if the weight-reducing hole forming upper die 6 is directly used for die forging after the upsetting, the blank temperature will be too high due to the too thin weight-reducing hole skin, so the weight-reducing hole cannot be formed, resulting in the problem of insufficient meat of the forging, when the step pressing process is adopted, the forging is first formed as a whole by the flat upper round plate 35, the upper punch 351 and the upper spoke die 352, then the weight-reducing hole is pressed by the weight-reducing hole forming upper die 36, since the projection area of the weight-reducing hole is small and the deformation amount is small, the weight-reducing hole can be well formed, the precision of the wind power gear finished forging 23 is relatively high, the size is close to the size of the finished gear, the amount of subsequent machining is small, the weight-reducing hole on the gear can be basically formed during die forging, the amount of subsequent machine tool processing is reduced, the material utilization rate of the gear forging is high, the production and processing cost is reduced and the processing efficiency is improved.

[0030] It should be noted that the above is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A wind turbine large gear closed die forging die with weight reduction holes, characterized in that: The application relates to a pie upsetting die (1) for upsetting a blank (2) into a pie blank (21) and a die forging die (3) for die forging the pie blank (21) into a finished forging (23) with weight-reducing holes; the pie upsetting die (1) is composed of a lower pie upsetting flat die (11), an upper pie upsetting flat die (12) and a pie upsetting ring sleeve (13); the pie upsetting ring sleeve (13) is arranged on the top of the lower pie upsetting flat die (11) and is provided with a pie upsetting cavity (131) in the center; the blank (2) is placed in the pie upsetting cavity (131); the upper pie upsetting flat die (12) is movably arranged on the top of the pie upsetting ring sleeve (13) and corresponds to the blank (2) placed in the pie upsetting ring sleeve (13); the die forging die (3) comprises upper and lower pads (32 and 31) corresponding to each other; the lower pad (31) is fixed with a lower die sleeve (33) on the top; the center of the lower die sleeve (33) is provided with a die cavity (331) in communication with the upper and lower pads (32 and 31); the top of the lower die sleeve (33) is provided with a lower circular plate (34) on the top surface of the lower pad (31); the center of the top of the lower circular plate (34) is provided with a lower punch (341) fixedly connected with the lower circular plate (34); the lower punch (341) is arranged in the center of the lower circular plate (34) and is provided with a lower spoke die (342) on the outer side; the lower spoke die (342) is fixedly connected with the lower circular plate (34); the pie blank (21) is placed on the top of the lower punch (341) in the die cavity (331); the bottom of the upper pad (32) is provided with an upper circular plate (35) with an outer diameter matching the diameter of the die cavity (331); the bottom center of the upper circular plate (35) is fixed with an upper punch (351) corresponding to the lower punch (341); the outer side of the bottom of the upper circular plate (35) is provided with an upper spoke die (352) fixedly connected with the upper circular plate (35); the upper spoke die (352) corresponds to the lower spoke die (342).

2. The wind power big gear closed die forging die with weight reduction holes according to claim 1, characterized in that: The top of the die cavity (331) is provided with a weight-reducing hole forming upper die (36) corresponding to the pie blank (21); the outer diameter of the weight-reducing hole forming upper die (36) matches the diameter of the die cavity (331); the bottom of the weight-reducing hole forming upper die (36) is provided with a shaping block (363) and a spoke module (364) protruding downward; the shaping block (363) and the spoke module (364) correspond to the upper punch (351) and the upper spoke die (352) respectively; the contour structures of the shaping block (363) and the spoke module (364) are the same as those of the upper punch (351) and the upper spoke die (352) respectively; the bottom center of the spoke module (364) is provided with a weight-reducing hole module (365) protruding downward.

3. The wind power big gear closed die forging die with weight reduction holes according to claim 2, characterized in that: The top of the weight-reducing hole forming upper die (36) is provided with a punch embedding hole (361) and a spoke die embedding groove (362) corresponding to the upper punch (351) and the upper spoke die (352) respectively and embeddedly matched with the upper punch (351) and the upper spoke die (352).

4. The wind power big gear closed die forging die with weight reduction holes according to claim 1, characterized in that: The lower punch (341) is provided with a concave cavity (3412) in the center of the top, the cavity (3412) is provided with a punch (313) embedded therein, the top surface of the punch (313) in the cavity (3412) is flush with the top surface of the lower punch (341); the bottom center of the cavity (3412) is provided with a material return hole (311) penetrating through the lower punch (341), the lower circular plate (34) and the lower pad plate (31), the material return hole (311) is provided with a ejector rod (312) in clearance fit, the top of the ejector rod (312) is fixedly connected with the bottom center of the punch (313).

5. The wind power big gear closed die forging die with weight reduction holes according to claim 1, characterized in that: The lower circular plate (34) is provided with a lower centering groove (3411) at the top for positioning the lower punch (341) and a lower positioning groove (3421) for positioning the lower spoke mold (342); the bottom of the upper circular plate (35) is provided with an upper centering groove (3511) for positioning the upper punch (351) and an upper positioning groove (3512) for positioning the upper spoke mold (352).

6. The wind power big gear closed die forging die with weight reduction holes according to claim 1, characterized in that: The lower pad plate (31) is provided with a centering groove (314) in the center of the top, and the lower mold sleeve (33) is provided with a centering protrusion (332) in sleeve fit with the centering groove (314).

7. The wind power big gear closed die forging die with weight reduction holes according to claim 1, characterized in that: The inner wall of the mold cavity (331) is inclined to the outside of the bottom at a position close to the bottom.

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