阅读说明：本技术 一种辊道行星轮的锻造方法 (Forging method of roller way planet wheel ) 是由 刘建国 李奎 张加会 郑林林 牛余刚 董云龙 赵兴明 赵丽美 尚贺军 于 2020-06-11 设计创作，主要内容包括：本发明公开了一种辊道行星轮的锻造方法,采用正面空心冲头冲孔、反面实心冲头落料的双面配合冲孔锻造方法,能够有效去除原材料中心区域的偏析、疏松、裂纹及孔洞的缺陷,保证了辊道行星轮内壁材料的纯净度和均质性,同时避免了因单面冲孔锻造工艺方法出现的翻边毛刺现象影响产品质量的问题。(The invention discloses a forging method of a roller way planet wheel, which adopts a double-face matching punching forging method of punching by a front hollow punch and blanking by a back solid punch, can effectively remove the defects of segregation, looseness, cracks and holes in the central area of raw materials, ensures the purity and homogeneity of the inner wall material of the roller way planet wheel, and simultaneously avoids the problem that the product quality is influenced by the flanging and burr phenomenon caused by a single-face punching forging process method.)

1. A forging method of a roller path planet wheel is characterized by comprising the following steps: comprises the following steps:

s1, controlling the forging temperature at 850-1200 ℃, placing the forging on a flat anvil, and upsetting and drawing the forging by using an electro-hydraulic hammer;

s2, placing the upset and drawn forging piece on a flat anvil, placing a hollow circular truncated cone punch at the center of the upper end face of the forging piece, wherein the table surface of the hollow circular truncated cone punch is opposite to the center of the upper end face of the forging piece, and gradually forging the hollow circular truncated cone punch into the forging piece by using an electro-hydraulic hammer;

s3, placing a hollow cylindrical punch at the center of the upper end face of the forging piece after the hollow circular truncated cone punch is forged into the forging piece, wherein the hollow cylindrical punch is opposite to the hollow circular truncated cone punch, and the cylindrical punch is gradually forged into the forging piece by using an electro-hydraulic hammer until the lower end face of the circular truncated cone punch is 30-50 mm away from the lower end face of the forging piece;

s4, turning the forge piece to enable the hollow cylindrical punch to automatically fall down, placing a solid circular truncated cone punch with the same specification as the hollow circular truncated cone punch on the upper end face of the forge piece, and forging the solid circular truncated cone punch into the forge piece by using an electro-hydraulic hammer to enable the hollow circular truncated cone punch, the forge piece core material and the solid circular truncated cone punch to fall down;

s5: taking away the hollow circular truncated cone punch, the hollow cylindrical punch, the solid circular truncated cone punch and the core material which are forged at the center of the forging, and reaming the center hole of the forging to the size required by the process by using a feed dog;

and S6, shaping the excircle and the end face of the forging to meet the size requirement of the final finished product, and slowly cooling after forging.

2. The forging method of the roller planet according to claim 1, characterized in that: the operation cycle of upsetting and elongating in S1 was performed 3 times.

3. The forging method of the roller planet according to claim 1, characterized in that: the end face diameters of the hollow circular truncated cone punch, the hollow cylindrical punch and the solid circular truncated cone punch are matched with the center punching size of the forge piece.

4. The forging method of the roller planet according to claim 1, characterized in that: and the forging ratio of upsetting the forging in the S1 is more than 6.

5. The forging method of the roller planet according to claim 1, characterized in that: and in the S6, the slow cooling of the forged piece after forging adopts a heap cooling, furnace cooling or sand burying cooling mode.

Technical Field

The invention relates to a manufacturing process of a wind power gear box, in particular to a forging method of a roller path planet wheel.

Background

The planet wheel forging is an important part of the wind power gear box and has the use characteristics of complex stress, concentrated load and long service time. The bearing of the inner hole of the common planet wheel is provided with an independent outer ring as a roller way, but in recent years, the planet wheel in the wind power gear box increasingly adopts a roller way structure, namely the inner wall of the planet wheel is directly used as the outer ring of the bearing. The inner wall of the planet wheel with the structure is directly used as a roller way of a roller bearing, the quality of the inner wall of the planet wheel is directly related to the quality and the service life of the whole gearbox, and how to ensure the quality of the inner wall of the planet wheel of the roller way is a subject of special concern in the industry.

Generally, the raw material used by the roller planetary gear is a continuous casting round billet or a die casting steel ingot, and because the core of the raw material has the defects of segregation, looseness, cracks and the like which seriously affect the quality of a forged piece, how to effectively remove the inherent core defect of the raw material is a problem faced by most current manufacturing plants. The roller planet wheel is generally manufactured by firstly upsetting and elongating a blank for multiple times to complete a forging ratio, and then performing the working procedures of rounding, punching (solid punch punching), reaming, leveling and the like. The method is a technological method adopted by most forging plants at present, the method for punching by using the solid punch has less core material removal, and the risk of incomplete removal of the center defect of the raw material exists. In addition, a small part of manufacturers adopt a method for single-side punching of a hollow punch, the method can generate serious shrinkage phenomenon, and can cause the problems that one side of the punched hole of the forge piece shrinks and the other side expands and simultaneously is accompanied with a large amount of flanging burrs, so that the integral forging efficiency is greatly reduced, and the product quality risk is high.

Disclosure of Invention

The purpose of the invention is as follows: the invention aims to provide a forging method of a roller path planet wheel, which can effectively remove the defects of segregation, looseness, cracks and holes in the central area of a raw material and can avoid the phenomenon of flanging and burring.

The technical scheme is as follows: the invention relates to a forging method of a roller path planet wheel, which comprises the following steps:

s1, controlling the forging temperature at 850-1200 ℃, placing the forging on a flat anvil, and upsetting and drawing the forging by using an electro-hydraulic hammer;

s2, placing the upset and drawn forging piece on a flat anvil, placing a hollow circular truncated cone punch at the center of the upper end face of the forging piece, wherein the table surface of the hollow circular truncated cone punch is opposite to the center of the upper end face of the forging piece, and gradually forging the hollow circular truncated cone punch into the forging piece by using an electro-hydraulic hammer;

s3, placing a hollow cylindrical punch at the center of the upper end face of the forging piece after the hollow circular truncated cone punch is forged into the forging piece, wherein the hollow cylindrical punch is opposite to the hollow circular truncated cone punch, and the cylindrical punch is gradually forged into the forging piece by using an electro-hydraulic hammer until the lower end face of the circular truncated cone punch is 30-50 mm away from the lower end face of the forging piece;

s4, turning the forge piece to enable the hollow cylindrical punch to automatically fall down, placing a solid circular truncated cone punch with the same specification as the hollow circular truncated cone punch on the upper end face of the forge piece, and forging the solid circular truncated cone punch into the forge piece by using an electro-hydraulic hammer to enable the hollow circular truncated cone punch, the forge piece core material and the solid circular truncated cone punch to fall down;

s5: taking away the hollow circular truncated cone punch, the hollow cylindrical punch, the solid circular truncated cone punch and the core material which are forged at the center of the forging, and reaming the center hole of the forging to the size required by the process by using a feed dog;

and S6, shaping the excircle and the end face of the forging into the required size of the final product, and slowly cooling after forging.

Preferably, the operation cycle of upsetting and elongating in S1 is performed 3 times.

Preferably, the diameters of the end faces of the hollow circular truncated cone punch, the hollow cylindrical punch and the solid circular truncated cone punch are matched with the size of the central punched hole of the forge piece.

Preferably, the forging ratio of upsetting the forging in S1 is greater than 6.

In S6, preferably, the slow cooling after forging is performed on the forged piece by a method of heap cooling, furnace cooling, or sand-buried cooling.

Has the advantages that: the double-face matched punching forging method for punching by the front hollow punch and blanking by the back solid punch can effectively remove the defects of segregation, looseness, cracks and holes in the central area of the raw material, ensure the purity and homogeneity of the inner wall material of the roller planet wheel, and simultaneously avoid the problem that the quality of a product is influenced by the flanging and burr phenomenon caused by the single-face punching forging process.

Drawings

FIG. 1 is a schematic diagram of a hollow circular truncated cone punching the front side of a forging;

FIG. 2 is a schematic illustration of a hollow cylinder punching the front face of a forging;

FIG. 3 is a schematic illustration of a solid cylinder punching the reverse side of a forging.

Detailed Description

The forging piece adopts carburizing steel made of 18CrNiMo7-6, the diameter of an inner hole of a hollow circular truncated cone punch is 250mm, and the diameters of end faces of the hollow cylindrical punch and the solid circular truncated cone punch are designed in a matching manner, so that the forging method comprises the following steps:

s1, in the embodiment, the forging temperature is controlled to be 850-1200 ℃, the forge piece is placed on a flat anvil, an 8T electro-hydraulic hammer is used for upsetting and drawing the forge piece, the forging ratio is 7.01, the forge piece is drawn to 793mm at first, then is upset to 500mm, the operation is repeated for 3 times, and finally is upset to 460 mm;

s2, placing the forging with the upset and the upset size of 460mm on a flat anvil, placing a hollow circular truncated cone punch at the center of the upper end face of the forging as shown in figure 1, wherein the table surface of the hollow circular truncated cone punch is right opposite to the center of the upper end face of the forging, and gradually forging the hollow circular truncated cone punch into the forging by using an electro-hydraulic hammer;

s3, as shown in figure 2, after the hollow round platform punch is forged into the forge piece, placing a hollow cylindrical punch at the center of the upper end face of the forge piece, wherein the hollow cylindrical punch is right opposite to the hollow round platform punch, and gradually forging the cylindrical punch into the forge piece by using an electro-hydraulic hammer until the lower end face of the round platform punch platform is 50mm away from the lower end face of the forge piece;

s4, turning the forge piece, wherein as shown in figure 3, the hollow cylindrical punch automatically falls off, a solid circular truncated cone punch is placed on the upper end face of the forge piece, and the solid circular truncated cone punch is forged into the forge piece by using an electro-hydraulic hammer, so that the hollow circular truncated cone punch, the forge piece core material and the solid circular truncated cone punch fall off;

s5: taking away the hollow circular truncated cone punch, the hollow cylindrical punch, the solid circular truncated cone punch and the core material which are forged at the center of the forging, and reaming the center hole of the forging to 354mm by using a feed bar;

s6, after shaping the excircle and the end face of the forge piece, slowly cooling the forge piece after forging, wherein the forge piece is slowly cooled by adopting a heap cooling mode.