CN111230182A

CN111230182A - Method for machining countersunk hole at joint of inner walls of thin-wall cavity part

Info

Publication number: CN111230182A
Application number: CN202010179583.4A
Authority: CN
Inventors: 孙玉钢; 周红岩
Original assignee: Shenyang Aircraft Industry Group Co Ltd
Current assignee: Shenyang Aircraft Industry Group Co Ltd
Priority date: 2020-03-16
Filing date: 2020-03-16
Publication date: 2020-06-05

Abstract

The invention belongs to the technical field of machining, and particularly relates to a method for machining a counter bore at the joint of the inner walls of a thin-wall cavity piece, which comprises the following steps of 1) finishing the bottom holes of a hole A, a hole B, a hole C and a hole D of the thin-wall cavity piece; step 2), processing a hole B and a hole C of the thin-wall cavity close to the center; and taking the hole A and the hole D close to the two sides as holes to be processed. The processing method of the counter sink at the joint of the inner walls of the thin-wall cavity piece effectively solves the problem that products are scrapped due to disqualification of the counter sink at the joint of the inner walls of the thin-wall cavity piece, the bottom hole of the counter sink does not have an out-of-tolerance phenomenon, and the product percent of pass reaches 100%; due to the fact that the guide distance of the reverse countersink drill is increased, the stability of the reverse countersink drill is obviously enhanced in the machining process, and the service life of the reverse countersink drill is greatly prolonged.

Description

Method for machining countersunk hole at joint of inner walls of thin-wall cavity part

Technical Field

The invention belongs to the technical field of machining, and particularly relates to a method for machining a counter sink at the joint of inner walls of thin-wall cavity parts.

Background

At present, a counter countersink machining mode is adopted in a machining method of a countersink at the joint of the inner wall of a thin-wall cavity part, but machining conditions are severe, intermittent cutting is adopted, and a cutter tooth breaking section is often caused in the machining process; the wall thickness of the part is thin, the guiding performance of the bottom hole is poor, the swinging amplitude of the cutter is large in the machining process, the stability is poor, the guide rod and the bottom hole are ground, and finally the bottom hole is ground into a horn mouth, so that the bottom hole is out of tolerance and the part is scrapped; and the appearance structure of some such parts is complicated, can't the clamping on the lathe, wants to realize processing on the lathe and needs extremely complicated special frock to assist the clamping just can realize, still causes the part to warp easily and scrap, and machining efficiency is low. Therefore, at present, an ideal processing method capable of completely realizing the counter sink at the joint of the inner walls of the thin-wall cavity parts is not available basically.

Disclosure of Invention

The invention aims to provide a method for machining a counter bore at the joint of the inner walls of thin-wall cavity parts, which is used for machining by using a reverse countersink drill through a simple tool, so that the one-time cross-inspection qualified rate of a product is improved, and the service life of a cutter can be greatly prolonged.

The technical scheme of the invention is as follows:

a method for processing a counter sink at the joint of the inner walls of a thin-wall cavity part comprises the following steps:

step 1) finishing bottom holes of a hole A501, a hole B502, a hole C503 and a hole D504 of the thin-wall cavity piece 5;

step 2) processing a hole B502 and a hole C503 of the thin-wall cavity piece 5 close to the center; holes A501 and holes D504 close to the two sides are used as holes to be processed;

step 3) placing the upper clamping plate 6 into the thin-wall cavity piece 5, wherein two holes of the upper clamping plate 6 correspond to the hole B502 and the hole C503 of the thin-wall cavity piece 5 and are respectively provided with the positioning bolt 8 and the diamond-shaped bolt 9, and the flat parts of the head parts of the positioning bolt 8 and the diamond-shaped bolt 9 are arranged in the long groove of the upper clamping plate 6, so that the positioning bolt 8 and the diamond-shaped bolt 9 do not rotate along the axis when being fastened;

step 4), assembling the positioning plate 2 on the positioning bolt 8 and the diamond bolt 9, installing the spring washer 4, and fastening the spring washer 3 by using a nut; the positions of the four holes and the holes on the positioning plate 2 are respectively consistent with the four holes of the thin-wall cavity component 5; the cylindrical part of the rhombic bolt 9 is perpendicular to the central connecting line of the hole B502 and the hole C503, so that over-positioning is avoided and corner errors can be eliminated;

and step 5) penetrating a guide shaft of the reverse countersink 7 into the hole A501 of the thin-wall cavity piece 5, assembling the reverse countersink 7 on the guide shaft of the reverse countersink 7 in the cavity in a quick connection mode, clamping the other end of the guide shaft of the reverse countersink 7 by using the air gun 1, starting the air gun 1 to start machining, and machining the hole D504 of the thin-wall cavity piece 5 by using the same machining method after the machining depth is qualified.

The invention has the advantages that:

the processing method of the counter sink at the joint of the inner walls of the thin-wall cavity piece effectively solves the problem that products are scrapped due to unqualified counter sinks at the joint of the inner walls of the thin-wall cavity piece, the bottom hole of the counter sink does not have an out-of-tolerance phenomenon, and the product percent of pass reaches 100%; due to the fact that the guide distance of the reverse countersink drill is increased, the stability of the reverse countersink drill is obviously enhanced in the machining process, and the service life of the reverse countersink drill is greatly prolonged.

Drawings

FIG. 1 is a partial cross-sectional view of a thin-walled cavity member bore countersunk at the intersection of the raw interior walls.

Fig. 2 is a partial cross-sectional view of a thin-walled cavity component countersunk at the intersection of machined interior walls.

Fig. 3 is a front view of the tooling assembly of the machining method.

Fig. 4 is a partial sectional view a-a of fig. 3.

Fig. 5 is a partial view of fig. 3 taken along direction B.

In the figure: 1, an air gun; 2, positioning a plate; 3, a nut; 4 a spring washer; 5 a thin-walled cavity member; 501A holes; 502B holes; 503C hole; 504D holes; 6, an upper splint; 7, back countersinking; 8, positioning a bolt; 9 diamond bolt.

Detailed Description

The following further describes a specific embodiment of the present invention with reference to the drawings and technical solutions.

It is to be understood that the appended drawings are not to scale, but are merely drawn with appropriate simplifications to illustrate various features of the basic principles of the invention. Specific design features of the invention disclosed herein, including, for example, specific dimensions, orientations, locations, and configurations, will be determined in part by the particular intended application and use environment.

In the several figures of the drawings, identical or equivalent components (elements) are referenced with the same reference numerals.

FIG. 1 is a partial cross-sectional view of a thin-walled cavity member bore countersunk at the intersection of the raw interior walls. Fig. 2 is a partial cross-sectional view of a thin-walled cavity component countersunk at the intersection of machined interior walls. Fig. 3 is a front view of the tooling assembly of the machining method. Fig. 4 is a partial sectional view a-a of fig. 3. Fig. 5 is a partial view of fig. 3 taken along direction B.

Referring to fig. 1 to 5, in this embodiment, the method for machining the counter sink at the joint of the inner walls of the thin-walled cavity member provided by the present invention includes the following steps:

step 1) finishing the bottom holes of the hole A501, the hole B502, the hole C503 and the hole D504 (shown in figure 2) of the thin-wall cavity piece 5.

Step 2) since the processing conditions of the B hole 502 and the C hole 503 allow, completely accessible processing can be achieved, and therefore the B hole 502 and the C hole 503 of the thin-walled cavity member 5 are processed first. The holes 501 and 504A are used as holes to be processed.

And 3) placing the upper clamping plate 6 into the thin-wall cavity piece 5, wherein two holes of the upper clamping plate 6 correspond to the hole B502 and the hole C503 of the thin-wall cavity piece 5 and are respectively provided with the positioning bolt 8 and the diamond-shaped bolt 9, and the flat head parts of the positioning bolt 8 and the diamond-shaped bolt 9 are arranged in the long groove of the upper clamping plate 6, so that the positioning bolt 8 and the diamond-shaped bolt 9 do not rotate along the axis when being fastened.

And 4) assembling the positioning plate 2 on the positioning bolt 8 and the diamond bolt 9, installing the spring washer 4, and fastening the spring washer 3 by using a nut. Wherein the positions of the four holes and the holes on the positioning plate 2 are consistent with the four holes of the thin-wall cavity member 5; the cylindrical part of the diamond bolt 9 is perpendicular to the central connecting line of the holes B502 and C503, so that the over-positioning is avoided and the corner error can be eliminated.

The above description of exemplary embodiments has been presented only to illustrate the technical solution of the invention and is not intended to be exhaustive or to limit the invention to the precise form described. Obviously, many modifications and variations are possible in light of the above teaching to those skilled in the art. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to thereby enable others skilled in the art to understand, implement and utilize the invention in various exemplary embodiments and with various alternatives and modifications. It is intended that the scope of the invention be defined by the following claims and their equivalents.

Claims

1. A method for processing a counter sink at the joint of the inner walls of a thin-wall cavity part is characterized by comprising the following steps:

step 1), finishing bottom holes of a hole A (501), a hole B (502), a hole C (503) and a hole D (504) of a thin-wall cavity piece (5);

step 2), processing a hole B (502) and a hole C (503) of the thin-wall cavity piece (5) close to the center; the hole A (501) and the hole D (504) close to the two sides are used as holes to be processed;

step 3), placing the upper clamping plate (6) into the thin-wall cavity piece (5), wherein two holes of the upper clamping plate (6) correspond to a hole B (502) and a hole C (503) of the thin-wall cavity piece (5) and are respectively filled with the positioning bolt (8) and the diamond-shaped bolt (9), and the flat parts of the heads of the positioning bolt (8) and the diamond-shaped bolt (9) are filled into the long groove of the upper clamping plate (6), so that the positioning bolt (8) and the diamond-shaped bolt (9) do not rotate along the axis when being fastened;

step 4), assembling the positioning plate (2) on the positioning bolt (8) and the rhombic bolt (9), installing the spring washer (4), and fastening the spring washer (3) by using a nut; the positions of the four holes and the positions of the holes on the positioning plate (2) are respectively consistent with the four holes of the thin-wall cavity piece (5); the cylindrical part of the rhombic bolt (9) is vertical to the center connecting line of the hole B (502) and the hole C (503) so as to avoid over-positioning and eliminate corner errors;

and step 5), a guide shaft of the reverse countersink drill (7) penetrates into the hole A (501) of the thin-wall cavity piece (5), the reverse countersink drill (7) is assembled on the guide shaft of the reverse countersink drill (7) in the cavity, the other end of the guide shaft of the reverse countersink drill (7) is clamped by the air gun (1), the air gun (1) is started to start machining, and after the machining depth is qualified, the hole D (504) of the thin-wall cavity piece (5) is machined by the same machining method.