CN110732849B

CN110732849B - Electric spark machining method for through hole in inner wall of cavity of thin-wall metal plate welding structural part

Info

Publication number: CN110732849B
Application number: CN201911130250.6A
Authority: CN
Inventors: 叶�武; 赵劲; 余勇; 郭飞; 黎剑; 张旭
Original assignee: AECC Guizhou Liyang Aviation Power Co Ltd
Current assignee: AECC Guizhou Liyang Aviation Power Co Ltd
Priority date: 2019-11-18
Filing date: 2019-11-18
Publication date: 2021-06-11
Anticipated expiration: 2039-11-18
Also published as: CN110732849A

Abstract

The invention discloses a method for processing a through hole on the inner wall of a cavity of a thin-wall sheet metal welding structural part, which comprises a first through hole which simultaneously penetrates through an installation seat and the inner wall of a closed cavity of a thin-wall sheet metal structure, and a second through hole which is parallel to the axis of the first through hole, intersects with the inner wall of the first through hole, extends into the closed cavity and penetrates through the inner wall of the closed cavity, wherein the aperture of the first through hole is larger than that of the second through hole. The invention solves the problem that the second through hole in the inner wall of the cavity of the thin-wall plate welding structural member is difficult to process by adopting a drill bit, realizes effective processing of the through hole in the inner wall of the cavity, reduces the processing risk and can meet the later assembly requirement.

Description

Electric spark machining method for through hole in inner wall of cavity of thin-wall metal plate welding structural part

Technical Field

The invention relates to the processing of a through hole on the inner wall of a cavity of a thin-wall plate welding structure part, in particular to the improvement of a processing method of the through hole on the inner wall of the cavity, thereby ensuring that the size and the position of the processed through hole can meet the later-stage assembly requirement.

Background

The thin-wall sheet metal welding structural part is widely applied to engines and mainly formed by welding sheet metal parts and machining parts. After the welding is finished, an inner cavity is formed on the part, and as shown in figure 1, in order to meet the assembly requirement of later parts, the mounting seat is processed

After the hole of the size, the hole is needed

Machining one at the edge of the hole

The hole passes through the inner cavity of the part and then is drilled to the mounting edge. In the actual processing process, a drill bit is adopted for processing

When the small hole is formed, the drill bit can swing in the machining process due to the fact that the machining condition inside the cavity cannot be observed, and therefore the small hole drilling machine is enabled to be used for drilling small holes

Through hole and

the relative position of the holes is difficult to ensure and can appear after processing

Complete shielding of the hole

More serious hole conditions may occur

The hole is drilled off, resulting in scrapping of the part.

Disclosure of Invention

The invention aims to provide a method for machining a through hole which is difficult to machine on the inner wall of a cavity of a thin-wall plate-welded structural part by adopting electric spark so as to reduce the machining risk of parts, ensure the machining qualification rate and meet the later-stage assembly requirement.

The technical scheme adopted by the invention is as follows:

the method for machining the through hole in the inner wall of the cavity of the thin-wall sheet metal welding structural part comprises a first through hole which penetrates through the mounting seat and the inner wall of the closed cavity of the thin-wall sheet metal structure at the same time, and a second through hole which is parallel to the axis of the first through hole, intersects with the inner wall of the first through hole, extends into the closed cavity and penetrates through the inner wall of the closed cavity, wherein the aperture of the first through hole is larger than that of the second through hole, the first through hole is machined firstly, then the second through hole is machined, in addition, the second through hole is machined in an electric spark machining mode, and the machining is carried out on the surface of one side, far away.

Further, the first through hole is processed by a drill.

Further, during the electric spark machining, the adopted electrode is a variable cross-section electrode.

Further, the cross section of the electrode is gradually increased from the tip end thereof along the axial direction of the electrode.

In the invention, when a second through hole on the inner wall of a cavity of a thin-wall sheet welding structure part is processed, after a fixed part is clamped, the relative position of the second through hole and a first through hole on a mounting seat is aligned, and then a special electrode is matched to realize the processing of the second through hole, wherein the method comprises the following steps:

1) fixing parts: clamping the part by using a clamp, fixing the part on a machining platform of electric spark equipment, and adjusting the machining position of the part;

2) aligning the machining position: clamping the special electrode by using an electrode bracket, adjusting the position, moving to a relative machining position of the part, and programming to align the relative position of the second through hole and the first through hole;

3) and (3) electric spark machining a second through hole: and after the electrode machining position is aligned, the second through hole is machined by using the optimized electric spark parameters.

Compared with the existing processing method, the invention has the advantages that: the invention solves the problem that the second through hole in the inner wall of the cavity of the thin-wall plate welding structural member is difficult to process by adopting a drill bit, realizes effective processing of the through hole in the inner wall of the cavity, reduces the processing risk and can meet the later assembly requirement.

Drawings

FIG. 1 is a schematic diagram of a second through hole in the inner wall of a cavity of a typical thin-wall sheet-welded structural member;

FIG. 2 is a second electrode dedicated to via machining;

FIG. 3 is a schematic view of an electrical discharge machining second through hole.

Detailed Description

The technical solution of the present invention is further explained below with reference to the accompanying drawings, but the claimed protection scope is not limited to the above.

As shown in FIG. 1, it is a second through hole on the inner wall of the cavity of the typical thin-wall plate welding structural member

Position schematic view, first through hole on mounting base

Hole and second through hole

In the machining process of the embodiment, a drill bit is firstly used for machining a first through hole on the mounting seat

(

The hole is relatively large, the hole is processed without special requirements, the conventional drill bit is adopted for drilling the hole), and then the second through hole is processed by electric spark

As shown in fig. 2, is used for processing the second through hole

The special electrode is made of red copper and is in a step shape, and the section of the special electrode is gradually reduced along the axial direction until the tail end.

As shown in fig. 3, the second through hole is machined by electric spark

The schematic diagram of the electrode holder is mainly completed by clamping the electrode.

Electric spark machining second through hole

The method comprises the following steps:

1) clamping the thin-wall sheet metal welding structural part shown in the figure 3 by using a clamp, adjusting and aligning the position of a mounting seat (because an electrode generally moves up and down, the axis of a processed hole is ensured to be vertical to the clamping surface of a machine tool during clamping), and then fixing a part;

2) then clamping the special electrode shown in the figure 2 by an electrode bracket, moving the electrode to the inside of the part, adjusting the direction of the electrode and avoiding the inner side of the electrode from touching the part;

3) moving down the electrode holder to insert the electrode into the first through hole

In the method, program is made to align the electrode and the second through hole

A machining position;

4) selecting proper electric spark parameters to complete the second through hole

And (4) processing.

Claims

1. Thin wall panel beating welds structure spare cavity inner wall through-hole processing method, including the first through-hole that runs through mount pad and thin wall panel beating structure closed cavity inner wall simultaneously to and parallel with first through-hole axis and intersect and extend to in the closed cavity and run through the second through-hole that seals the cavity inner wall with first through-hole inner wall, the aperture of first through-hole is greater than the aperture of second through-hole, its characterized in that:

firstly, a drill bit is adopted to process a first through hole, then a second through hole is processed, in addition, an electric spark machining mode is adopted to process the second through hole, the surface of one side, far away from the mounting seat, of the inner wall of the thin-wall metal plate structure closed cavity body is processed during the electric spark machining of the second through hole, and during the electric spark machining, an electrode adopted is a variable cross-section electrode.

2. The method for processing the through hole in the inner wall of the cavity of the thin-wall sheet-welded structural member as recited in claim 1, wherein: the cross section of the electrode is gradually increased along the axial direction of the electrode from the tail end of the electrode.