CN215431356U

CN215431356U - Fork landing gear outer cylinder forging stock

Info

Publication number: CN215431356U
Application number: CN202120432459.4U
Authority: CN
Inventors: 张海成; 罗恒军; 曾德涛; 吕孝根; 孟斌; 张富淇
Original assignee: China National Erzhong Group Deyang Wanhang Die Forging Co ltd
Current assignee: China National Erzhong Group Deyang Wanhang Die Forging Co ltd
Priority date: 2021-02-26
Filing date: 2021-02-26
Publication date: 2022-01-07
Anticipated expiration: 2031-02-26

Abstract

The utility model relates to the technical field of forging, and provides a fork-shaped landing gear outer cylinder forging stock which comprises a forging stock body, wherein a skin connecting part for forging a web plate is arranged on the forging stock body; the skin connecting part comprises a skin connecting part body in a plate-shaped structure and a shunting boss arranged on at least one surface of the skin connecting part body; a shunting groove is formed between the part of the forging blank body, which is positioned around the connecting leather part, and the shunting boss. Through set up the reposition of redundant personnel boss on even skin portion body to make reposition of redundant personnel boss and forging stock body on lie in between the part on even skin portion around and form the reposition of redundant personnel recess, like this at the forging in-process, make this reposition of redundant personnel recess form the compensation space and supply blank metal free flow, not only increased the blank and filled the vertical flow space of in-process, reduced the deformation resistance of blank metal, thereby effectively reduced the shaping load.

Description

Fork landing gear outer cylinder forging stock

Technical Field

The utility model relates to the technical field of forging, in particular to a forging stock for an outer cylinder of a fork landing gear.

Background

The landing gear is one of four key parts of an airplane, and is a device for supporting the self weight of the airplane and bearing complex loads when the airplane is parked, taxied, taken off and landed on the ground. The outer cylinder of the landing gear is a key part of the landing gear of the airplane and is also a component with the largest size, the heaviest mass and the most complex structure in an airplane system. In the service process of the aircraft in a complex environment, the outer cylinder of the landing gear is subjected to axial and radial alternating loads for a long time, and the stability of the structure and the performance of the landing gear is reduced under the action of cyclic stress, so that the service life of the landing gear is shortened, and the technical level and the stability of the landing gear have important influence on the overall performance and the use safety of the aircraft.

In the aspect of the development of the outer cylinder of the landing gear of the aircraft at home and abroad at present, a relatively advanced method is adopted for integral forming, namely die forging forming, and the forging for processing the part is required to meet the performance required by design indexes and also to ensure strict process stability and controllability in the forging process, so that high requirements are provided for the development of the forging. The outer barrel part of the landing gear is large in size, complex in outline and asymmetric; the corresponding forging has larger size and complex structure, and has the defects of severe section change and complex metal flow in places with difficult filling, such as high-altitude bags, bosses and the like and places with large deformation, such as thin webs, narrow ribs and the like.

The structure of a prior art landing gear outer cylinder forging 1 is shown in fig. 1 and 2, the landing gear outer cylinder forging 1 has a thin web and a wide-spacing fork-shaped characteristic structure, and a web 2 is closed and does not contain any part characteristic; specifically, the web 2 is arranged inside the outer cylinder forging 1 of the landing gear, the edge of the web 2 is connected with other parts of the forging, and the thickness of the web 2 is smaller than that of other parts connected with the edge of the web 2.

Aiming at the outer cylinder forging 1 of the landing gear with the structure, in the traditional forging process, the part of a forging stock for forging a web plate is often designed into a skin-connected characteristic, and the section of the skin-connected characteristic is of a typical H characteristic structure; this causes excess metal in the skinned features to flow only to the flash at the later stage of filling, and the resistance to deformation is high, which in turn causes a sharp increase in the forming load. Due to the limitation of tonnage of forging equipment, when the forming load is increased sharply, the fillet characteristic of the forging is difficult to fill due to insufficient forging pressure, and the forging method is often matched with a multi-fire forging method for production, so that the production period is prolonged, and the production cost is increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of providing a forked landing gear outer cylinder forging stock so as to reduce the forming load of the forging stock in the forging process.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the outer cylinder forging stock of the fork landing gear comprises a forging stock body, wherein a skin connecting part for forging the outer cylinder forging stock into a web plate is arranged on the forging stock body; the skin connecting part comprises a skin connecting part body in a plate-shaped structure and a shunting boss arranged on at least one surface of the skin connecting part body; a shunting groove is formed between the part of the forging blank body, which is positioned around the connecting leather part, and the shunting boss.

Furthermore, two surfaces of the leather connecting part body are provided with shunting bosses.

Furthermore, the flow distribution boss is of a variable cross-section structure with the cross-sectional size gradually reduced from inside to outside.

Furthermore, the cross section of the shunting boss is consistent with the surface shape of the connecting leather part body.

Furthermore, the edge of the shunting boss is in arc transition with the connecting leather body.

The utility model has the beneficial effects that: according to the forging stock of the outer cylinder of the fork landing gear, provided by the embodiment of the utility model, the shunting boss is arranged on the connecting skin part body, and the shunting groove is formed between the shunting boss and the part, positioned around the connecting skin part, of the forging stock body, so that in the forging process, the shunting groove forms a compensation space for free flow of blank metal, the vertical flow space of the blank in the filling process is increased, the deformation resistance of the blank metal is reduced, and the forming load is effectively reduced; in addition, the redundant metal is prevented from flowing towards the flash at the later filling stage, and the forging equipment is ensured to have enough forging pressure to fill the fillet characteristic of the forge piece, so that the service life of the forging equipment is prolonged; and redundant blanks flow into the shunting grooves, so that the phenomenon that metal is folded in a closed cavity due to excessive blanking can be avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below; it is obvious that the drawings in the following description are only some embodiments described in the present invention, and that other drawings can be obtained from these drawings by a person skilled in the art without inventive effort.

FIG. 1 is a schematic structural view of an outer barrel forging of a landing gear;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a schematic structural diagram of an outer cylinder forging stock of a fork landing gear provided by the embodiment of the utility model;

fig. 4 is a sectional view B-B of fig. 3.

The reference numbers in the figures are: 1-outer barrel forging of the landing gear, 2-web plate, 3-forging blank body, 4-connecting skin part, 5-connecting skin part body, 6-shunting boss and 7-shunting groove.

Detailed Description

In order that those skilled in the art will better understand the present invention, the following further description is provided in conjunction with the accompanying drawings and examples. It is to be understood that the described embodiments are merely a few embodiments of the utility model, and not all embodiments. The embodiments and features of the embodiments of the utility model may be combined with each other without conflict.

FIG. 3 is a schematic structural diagram of an outer cylinder forging stock of a fork landing gear provided by the embodiment of the utility model; fig. 4 is a sectional view B-B of fig. 3. Referring to fig. 3 and 4, the fork landing gear outer cylinder forging stock provided by the embodiment of the utility model comprises a forging stock body 3, wherein the forging stock body 3 is provided with a connecting skin part 4 for forging into a web; the leather connecting part 4 comprises a leather connecting part body 5 in a plate-shaped structure and a shunting boss 6 arranged on at least one surface of the leather connecting part body 5; a shunting groove 7 is formed between the part of the forging blank body 3 around the connecting skin part 4 and the shunting boss 6.

The edge of the connecting skin part body 5 is connected with other parts on the forging blank body 3 and is in arc transition. Preferably, the two surfaces of the leather connecting body 5 are provided with shunting bosses 6. The flow distribution boss 6 is a variable cross-section structure with the cross-sectional dimension gradually reduced from inside to outside. Specifically, the cross section of the shunting boss 6 refers to a section parallel to the surface of the connecting skin part body 5; the inner end of the shunting boss 6 refers to the end close to the surface of the skin connecting part body 5 in the direction vertical to the surface of the skin connecting part body 5, and the outer end of the shunting boss 6 refers to the end far away from the surface of the skin connecting part body 5 in the direction vertical to the surface of the skin connecting part body 5. Preferably, the cross-sectional shape of the flow dividing boss 6 is consistent with the surface shape of the skin connecting part body 5. The edge of the shunting boss 6 is in arc transition with the leather connecting body 5. For example, in the present embodiment, the cross-sectional shape of the flow dividing projection 6 and the surface shape of the skin connecting portion body 5 are both substantially triangular.

When the forging blank of the outer cylinder of the fork landing gear provided by the embodiment of the utility model is forged, the upper die descends to contact with the blank, and the blank starts to slowly fill a die cavity and flows into the shunting groove 7 under the action of the pressure of the upper die; along with the continuous descending of the upper die, the filling rate is slowly increased, and meanwhile, the volume of the shunting groove 7 is continuously reduced but is not full; and in the later filling stage, the long rods and the branches around the connecting skin part 4 are filled in sequence, and a certain space is reserved in the shunting groove 7 for the free flow of the blank metal until the forging is finished. Therefore, during the process of filling the cavity, the compensation space formed by the diversion groove 7 is always provided for the free flow of the blank metal, thereby reducing the pressing load.

According to the forging stock of the outer cylinder of the fork landing gear, the shunting boss 6 is arranged on the connecting skin part body 5, and the shunting boss 6 and the part, located around the connecting skin part 4, of the forging stock body 3 form the shunting groove 7, so that in the forging process, the shunting groove 7 forms a compensation space for free flow of blank metal, the vertical flow space of the blank in the filling process is increased, the deformation resistance of the blank metal is reduced, and the forming load is effectively reduced; in addition, the redundant metal is prevented from flowing towards the flash at the later filling stage, and the forging equipment is ensured to have enough forging pressure to fill the fillet characteristic of the forge piece, so that the service life of the forging equipment is prolonged; and redundant blanks flow into the shunting grooves 7, so that the phenomenon that metal is folded in a closed cavity due to excessive blanking can be avoided.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The outer cylinder forging stock of the fork landing gear comprises a forging stock body (3), wherein a skin connecting part (4) for forging into a web plate is arranged on the forging stock body (3); the leather connecting part (4) is characterized by comprising a leather connecting part body (5) in a plate-shaped structure and a shunting boss (6) arranged on at least one surface of the leather connecting part body (5); a shunting groove (7) is formed between the part of the forging blank body (3) around the connecting leather part (4) and the shunting boss (6).

2. The fork landing gear outer barrel forging according to claim 1, wherein the skin portion body (5) is provided with flow dividing bosses (6) on both surfaces.

3. The forked landing gear outer barrel forging according to claim 1 or 2, wherein the flow distribution boss (6) is a variable cross-section structure with gradually decreasing cross-sectional dimensions from inside to outside.

4. The forked landing gear outer barrel forging according to claim 3, wherein the cross-sectional shape of the split boss (6) conforms to the surface shape of the integral skin body (5).

5. The forked landing gear outer barrel forging according to claim 1 or 2, characterized in that the edges of the shunting bosses (6) are in circular arc transition with the connecting skin body (5).