CN109261879B

CN109261879B - Inner hole protective tool for preventing deformation of inner hole of hollow forging spindle

Info

Publication number: CN109261879B
Application number: CN201810978769.9A
Authority: CN
Inventors: 陈文全; 毕京华
Original assignee: Shandong Laiwu Jinlei Wind Power Technology Co ltd
Current assignee: Shandong Laiwu Jinlei Wind Power Technology Co ltd
Priority date: 2018-08-27
Filing date: 2018-08-27
Publication date: 2021-03-23
Anticipated expiration: 2038-08-27
Also published as: CN109261879A

Abstract

The utility model provides a prevent hole protective equipment of hollow forging main shaft hole deformation, includes child mould, hollow main shaft and main shaft hole, and the upper end of hollow main shaft sets up the hole protecting die, the hole protecting die is the T type, and the hole protecting die comprises the bracing piece of vertical setting and the spacing flange on its upper portion, and spacing flange is the little inverse truncated cone of the big lower part in upper portion, and the bracing piece is located the main shaft downthehole. The flange forming process and the shaft body core rod drawing process are different, because the inner hole is not supported by the core rod, the deformation of the end part of the inner hole flange is inevitable, and the inner hole is supported by the design of the invention to ensure that the inner hole is not deformed in the flange forming process. The invention avoids the problem of deformation of the inner hole of the main shaft in the hollow forging process. The invention has simple structure, lower cost, is very simple, convenient and practical in actual operation, and can effectively prevent the deformation of the inner hole in the process of upsetting the flange of the hollow main shaft. The size of the device can be changed according to the structural form of the device, so that the device can adapt to devices with different capabilities, and the applicability is high.

Description

Inner hole protective tool for preventing deformation of inner hole of hollow forging spindle

Technical Field

The invention belongs to the technical field of hollow forging, and particularly relates to an inner hole protector for preventing an inner hole of a hollow forging spindle from deforming.

Background

In recent years, wind power generation is rapidly developed, the model of a fan tends to be large, the specification of a wind power main shaft is also large, and an inner hole of the main shaft is also larger and larger. The wind power main shaft is mainly divided into two parts, namely a flange and a shaft body, the existing forging is basically flange forming by a die, the shaft body is formed by free forging and is solid forging, and an inner hole is machined by a subsequent machine. However, with the continuous increase of the inner hole, the solid forging wastes materials more and more seriously, the hollow forging of the main shaft is imperative, the hollow forging and the solid forging flow are basically consistent, the flange forming is also adopted, the shaft body is formed by free forging, and the difference is that the shaft body is formed by drawing out a core rod.

However, in the process of flange forming, the inner hole can be seriously deformed, which brings great trouble to subsequent machining and increases the machining difficulty.

Disclosure of Invention

In order to solve the technical problem, the invention provides an inner hole protector for preventing the deformation of an inner hole of a hollow forging spindle. The problem that the inner hole of the main shaft is deformed in the hollow forging process is avoided by the protective tool.

In order to achieve the purpose, the invention adopts the technical scheme that: including child mould, hollow main shaft and main shaft hole, its characterized in that: the upper end of hollow main shaft sets up the hole protective mould, the hole protective mould is the T type, and the hole protective mould comprises the bracing piece of vertical setting and the spacing flange on its upper portion, and spacing flange is the big small inverse truncated cone shape in lower part in upper portion, and the bracing piece is located the main shaft inner hole.

Furthermore, a handle is arranged on the upper part of a limiting flange of the inner hole protection die.

The invention has the beneficial effects that: the invention avoids the problem of deformation of the inner hole of the main shaft in the hollow forging process. The invention has simple structure, lower cost, is very simple, convenient and practical in actual operation, and can effectively prevent the deformation of the inner hole in the process of upsetting the flange of the hollow main shaft. The size of the device can be changed according to the structural form of the device, so that the device can adapt to devices with different capabilities, and the applicability is strong.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of load calculation in a conventional limiting flange forming process;

FIG. 3 is a schematic view of load calculation during the forming process of the stop flange according to the present invention;

fig. 4 is a schematic view of flange forming after the mold protection of the invention is used.

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.

A kind of inner hole protective equipment preventing the deformation of the inner hole of the hollow forged main shaft, as shown in figure 1, including the moulding bed 2, the hollow main shaft 3 and the inner hole 4 of the main shaft, its characteristic lies in: the upper end of hollow main shaft 3 sets up hole protective mould 1, hole protective mould 1 is the T type, and hole protective mould 1 comprises the bracing piece of vertical setting and the spacing flange on its upper portion, and spacing flange is the big little inverted circular truncated cone in lower part in upper portion, and the bracing piece is located main shaft hole 4. The flange forming process and the shaft body core rod drawing process are different, because the inner hole is not supported by the core rod, the deformation of the end part of the inner hole flange is inevitable, and the inner hole is supported by the design of the invention to ensure that the inner hole is not deformed in the flange forming process. The invention avoids the problem of deformation of the inner hole of the main shaft in the hollow forging process. The invention has simple structure, lower cost, is very simple, convenient and practical in actual operation, and can effectively prevent the deformation of the inner hole in the process of upsetting the flange of the hollow main shaft. The size of the device can be changed according to the structural form of the device, so that the device can adapt to devices with different capabilities, and the applicability is high.

In order to further facilitate the use of the invention, a handle 5 is arranged at the upper part of the horizontal rod of the inner hole protection die 1.

The flange forming process is different from the shaft body core rod drawing process, because the inner hole is not supported by the core rod, the deformation of the end part of the inner hole flange is inevitable, but the inner hole is reduced, the inner hole can be artificially expanded before upsetting the flange, a conical transition is used, the deformation of the inner hole after forming is improved to some extent, but a larger circular arc is formed near the outer end face part, and although the subsequent machining size can be ensured, the flange forming process is not ideal. The inner hole protection die can be manufactured to prevent the deformation of the inner hole when the flange is upset, the deformation of the inner hole during the flange forming can be well controlled after the protection of the inner hole protection die, as shown in fig. 2, but after computer simulation calculation, simulation is carried out according to the actual product size, the diameter of the flange is 1900mm, the load during the forming process is found to be too high, the load reaches 100MN when the forming is over half, and the load is closer to 300MN at the later stage of the forming, which cannot be realized on a general free forging press at all. The high difficulty of integral flange forming load is mainly caused by the fact that the contact area is too large when the flange is formed, the inner hole die protector is improved, the limiting flange of the inner hole die protector adopts an inverted circular truncated cone shape with a large upper portion and a small lower portion, the contact area is reduced, the contact area is small when the flange is upset by the improved inner hole die protector, the required load is obviously reduced, as shown in figure 3, a 5000-ton free forging press can achieve the purpose, only the middle portion is formed, but the periphery is only required to be flattened by narrow flat anvils one by one after the inner hole die protector is taken out, as shown in figure 4, the deformation of a central hole is basically not influenced when the periphery on the left side is pressed, more importantly, the pressure requirement on equipment is reduced, and the operation is simple and practical.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a prevent hole protective equipment that hollow forging main shaft hole warp, includes child mould (2), hollow main shaft (3) and main shaft hole (4), its characterized in that: the upper end of hollow main shaft (3) sets up hole protecting die (1), hole protecting die (1) is the T type, and the hole protecting die comprises the bracing piece of vertical setting and the spacing flange on its upper portion, and spacing flange is the big little inverted circular truncated cone in lower part in upper portion, and the bracing piece is located main shaft hole (4).

2. The female hole protector for preventing deformation of a female hole of a hollow forging spindle according to claim 1, wherein: and a handle (5) is arranged on the upper part of the limiting flange of the inner hole protection die (1).