CN111804969A

CN111804969A - Auxiliary limiting stopper for milling step difference

Info

Publication number: CN111804969A
Application number: CN202010823096.7A
Authority: CN
Inventors: 刘明亮; 王�琦
Original assignee: Shenyang Aircraft Industry Group Co Ltd
Current assignee: Shenyang Aircraft Industry Group Co Ltd
Priority date: 2020-08-17
Filing date: 2020-08-17
Publication date: 2020-10-23

Abstract

The invention belongs to the technical field of assembly and provides an auxiliary limiter for milling step difference. The auxiliary limiting device is a milling auxiliary tool with double limiting positions, and the milling auxiliary tool consists of a transmission mechanism, a first-stage limiting mechanism and a second-stage limiting mechanism. The first-stage limiting mechanism is in threaded connection with the outer surface of the shaft sleeve of the transmission mechanism, and the second-stage limiting mechanism is in threaded connection with the outer surface of the limiting sleeve of the first-stage limiting mechanism. Through the relative position regulation of stop collar and milling cutter, stop collar and uide bushing, both control the milling degree of depth, the dual spacing protection product of accessible again prevents to mill of milling cutter knife tip to the product reference surface and excessively extrudees, and the excessive milling of jump layer. The invention not only improves the working efficiency of operators and lightens the labor capacity of workers, but also can effectively improve the surface quality of the airplane and is suitable for various skin butt-joint forms.

Description

Auxiliary limiting stopper for milling step difference

Technical Field

The invention belongs to the technical field of assembly, and relates to an auxiliary limiter for removing plane surface step differences.

Background

During the assembly of an aircraft, there are many steps and gaps, such as between skin butt seams, between skin and structure, between rudder face and structure, between fuselage sections, between fairing panels, and the like. The generation of the step and the gap can reduce the assembly quality of the airplane appearance, thereby causing serious influence on the aspects of aerodynamic characteristics, flight performance, stealth performance and the like of the airplane. The method for controlling the step difference and the gap at the present stage is mainly used for analyzing and controlling the aspects of part manufacturing, assembly fixture appearance clamping plates, tolerance distribution, assembly stress and the like at the early stage of airplane assembly, but the effect of the finished airplane product is poor. Therefore, the assembled aircraft surface needs to be further accurately measured and processed. At present, digital detection technology and means aiming at the step difference clearance tend to be mature and various, but the method and the tool for removing the step difference after assembly are still in weak links. The limiting guide sleeve tool provided by the invention can effectively remove the step difference on the surface of the airplane by matching with a professional milling cutter, is suitable for various airplane surfaces, such as single-curve and double-curvature surfaces, linear butt joint, curve butt joint and the like, and is not limited by the size of a butt joint gap.

Disclosure of Invention

When the step difference of the outer surface of the airplane is removed by field workers, the skin at the step difference is polished and trimmed by tools such as an abrasive belt machine and the like for products to be manufactured, which are produced by pre-assembly, mainly through a series of measures for prevention in the early stage of assembly. The process needs measurement, protection, repair and other work, has low efficiency, complex operation and uneven quality, and is easy to damage peripheral products. In order to solve the problems, the invention can dispense with the steps of measurement, protection and the like by using the limiting tool and matching with a special cutter, and can be directly applied to the surface of the assembled product. The invention not only improves the working efficiency of operators and lightens the labor capacity of workers, but also can effectively improve the surface quality of the airplane and is suitable for various skin butt-joint forms. The auxiliary limiting device is a milling auxiliary tool with double limiting positions, and the milling auxiliary tool consists of a transmission mechanism, a first-stage limiting mechanism and a second-stage limiting mechanism. The first-stage limiting mechanism is in threaded connection with the outer surface of the shaft sleeve of the transmission mechanism, and the second-stage limiting mechanism is in threaded connection with the outer surface of the limiting sleeve of the first-stage limiting mechanism. Through the relative position regulation of stop collar and milling cutter, stop collar and uide bushing, both control the milling degree of depth, the dual spacing protection product of accessible again prevents to mill of milling cutter knife tip to the product reference surface and excessively extrudees, and the excessive milling of jump layer. The transmission shaft thread adopts a universal interface, a special milling cutter can be matched for use, and the tail part of the transmission shaft is clamped by the air drill, so that the rotary milling of the cutter is realized. The limiter can be matched with milling cutters with different outer diameters and angles, when the limiter is used, the milling cutters with different sizes and angles are selected for milling according to different step values and the design requirements of the pneumatic surface of a corresponding airplane, profiling milling can be carried out according to edges formed by step differences, and small step differences can also be milled directly without profiling.

The technical scheme of the invention is as follows:

an auxiliary limiting stopper for milling step difference comprises a transmission mechanism, a first-stage limiting mechanism and a second-stage limiting mechanism.

The transmission mechanism comprises a steel wire retainer ring 1, a shaft sleeve 2, a transmission shaft 3, a limiting front guide 8 and a spring A9. The shaft sleeve 2 is of a cylindrical structure, the outer molded surface of the shaft sleeve 2 is of a full-thread structure, and only the lower part of the inner molded surface is provided with a thread structure which is connected with the limiting front guide 8 in a matched mode. The limiting front guide 8 is an annular external thread nut which is screwed on the lower part of the inner profile of the shaft sleeve 2 and used for limiting the transmission shaft 3. The upper part of the transmission shaft 3 is a clamping part, the lower part of the transmission shaft is a cutter connecting part, the middle part of the transmission shaft is an annular groove structure matched with the inner profile of the shaft sleeve 2, and a spring A9 is arranged in the annular groove. The transmission shaft 3 is in clearance fit with the hole shaft of the shaft sleeve 2, and the lower part of the transmission shaft 3 penetrates through the limiting front guide 8 to form a closed cavity; and the limit is realized by the steel wire retainer ring 1 embedded in the groove at the lower part of the transmission shaft 3.

The first-stage limiting mechanism comprises a limiting sleeve 6, a limiting nut 4, a spring B10 and a tooth-shaped clamping ring 11. The limiting nut 4 is a stepped nut and is in threaded connection with the outer molded surface of the shaft sleeve 2. The tooth-shaped clamping ring 11 is of an inner-shaped stepped cylinder structure; the upper part of the tooth-shaped snap ring 11 is sleeved on the small-diameter outer molded surface at the step of the limiting nut 4, the lower end of the tooth-shaped snap ring 11 is sleeved on the outer molded surface of the shaft sleeve 2, a small closed cavity is formed between the middle part of the tooth-shaped snap ring 11 and the shaft sleeve 2, and a spring B10 is arranged in the closed cavity. And a clamping groove on one side of the outer profile of the shaft sleeve 2 is matched with a guide block on the inner profile of the tooth-shaped clamping ring 11, so that the radial rotation of the tooth-shaped clamping ring 11 is limited. The limiting sleeve 6 is of a cylindrical structure, the inner and outer molded surfaces at the upper part of the limiting sleeve are of a threaded structure, and the limiting sleeve is screwed with the outer molded surface of the shaft sleeve 2 through the threaded structure; the lower end surface of the limiting sleeve 6 is a semi-circular ring surface and is in direct contact with a product during processing. Stop collar 6 is the same with 11 external diameters of tooth type snap ring, and 6 upper ends of stop collar and tooth type snap ring 11 are through the tooth interlock, prevent that stop collar 6 from taking place radial rotation when drive mechanism rotates. Through the limitation, the axial adjustment of the relative position of the end surface of the limiting sleeve 6 and the end surface of the machining cutter is realized.

The second-stage limiting mechanism comprises a guide sleeve 7 and a fastening nut 5. The guide sleeve 7 is of a cylinder structure, the outer molded surface is smooth, and the upper part of the inner molded surface is provided with an internal thread which is screwed with the outer molded surface of the limit sleeve 6. The fastening nut 5 is in threaded connection with the limiting sleeve 6 and is positioned between the step of the limiting nut 4 and the guide sleeve 7, and the relative position of the end faces of the limiting sleeve 6 and the guide sleeve 7 is adjusted through a self-locking function formed by the double nuts.

The roughness of the contact surfaces of the limiting sleeve 6 and the guide sleeve 7 with the product is not more than Ra1.6, and the mirror surface is polished.

The invention has the beneficial effects that: the invention provides an auxiliary limiter for milling step difference, an operator does not need to perform a large amount of measurement and repair after preassembly, and the step difference can be removed by the auxiliary limiter only by controlling the pneumatic surface step difference within the maximum range of the design requirement through a series of precautionary measures in the early stage of assembly, so that the time of the operator is saved, the working efficiency is improved, and the surface quality is improved.

Drawings

FIG. 1 is a front view of an auxiliary stop for milling a step;

FIG. 2 is a cross-sectional view of the auxiliary stop milling the step difference;

FIG. 3 is a bottom view of the auxiliary stop milling the step difference;

FIG. 4 is a schematic view of a transmission mechanism; wherein, (a) is a front view of the transmission mechanism, and (b) is a sectional view of the transmission mechanism A-A;

FIG. 5 is a schematic view of a first stage stop mechanism; wherein, (a) is a front view of the first-stage limiting mechanism, and (b) is a C-C direction sectional view of the first-stage limiting mechanism;

FIG. 6 is a schematic view of a second stage stop mechanism; wherein, (a) is a front view of the second-stage limiting mechanism, and (b) is a D-D sectional view of the second-stage limiting mechanism;

in the figure: 1, a steel wire retainer ring; 2, shaft sleeve; 3, driving a shaft; 4, limiting a nut; 5 fastening the nut; 6, a limiting sleeve; 7, a guide sleeve; 8, limiting and leading; 9, a spring A; 10, a spring B; 11 tooth type snap ring.

Detailed Description

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

As shown in fig. 1 to 3, an auxiliary stop for milling a step difference includes a transmission mechanism, a first-stage stop mechanism and a second-stage stop mechanism.

The first-stage limiting mechanism comprises a limiting sleeve 6, a limiting nut 4, a spring B10 and a tooth-shaped clamping ring 11. The limiting nut 4 is a stepped nut and is in threaded connection with the outer molded surface of the shaft sleeve 2. The tooth-shaped clamping ring 11 is of an inner-shaped stepped cylinder structure; the upper part of the tooth-shaped snap ring 11 is sleeved on the small-diameter outer molded surface at the step of the limit nut 4, and the lower end of the tooth-shaped snap ring 11 is sleeved on the outer molded surface of the shaft sleeve 2, so that a small closed cavity is formed between the middle part of the tooth-shaped snap ring 11 and the shaft sleeve 2, and a spring B10 is arranged in the small closed cavity. A clamping groove on one side of the outer surface of the shaft sleeve 2 is matched with a guide block on the inner surface of the tooth-shaped clamping ring 11, so that the radial rotation of the tooth-shaped clamping ring 11 is limited. The limiting sleeve 6 is of a cylindrical structure, the inner and outer molded surfaces at the upper part of the limiting sleeve are of a threaded structure, and the limiting sleeve is screwed with the outer molded surface of the shaft sleeve 2 through the threaded structure; the lower end surface of the limiting sleeve 6 is a semi-circular ring surface and is in direct contact with a product during processing. The outer diameter of the limiting sleeve 6 is the same as that of the tooth-shaped snap ring 11, and the upper end of the limiting sleeve 6 is meshed with the tooth-shaped snap ring 11 through teeth, so that the limiting sleeve 6 is prevented from radially rotating when the transmission mechanism rotates; the axial adjustment of the relative position of the end surface of the limiting sleeve 6 and the end surface of the processing cutter is realized.

The implementation method comprises the following steps:

when an operator needs to remove the skin butt joint step difference, the cutting lowest point of the milling cutter is adjusted in advance to be flush with the end face of the limiting sleeve, and the milling cutter is ensured not to hurt the skin when the end face of the limiting sleeve is attached to the surface of an airplane. And adjusting the guide sleeve through threaded connection according to the size of the butt seam step value, wherein the distance between the limiting sleeve and the end face of the guide sleeve is required to be not more than the maximum step difference of the skin, and the guide sleeve is locked by a fastening nut to prevent the guide sleeve from radially rotating during machining. And when the adjustment is completed, the surface of the skin at the butt seam and the end surface of the limiting sleeve need to be lubricated before processing, and lubricating grease can be used for coating the contact surface to prevent the paint layer of the part from being rubbed and damaged. The cutting generated during the processing is discharged through the row cutting opening of the limiting sleeve. The auxiliary limiter is suitable for skin surfaces with different butt seam step values and different curvatures and is not limited by butt seam step difference gaps and straightness.

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. An auxiliary limiting stopper for milling step difference is characterized by comprising a transmission mechanism, a first-stage limiting mechanism and a second-stage limiting mechanism;

the transmission mechanism comprises a steel wire retainer ring (1), a shaft sleeve (2), a transmission shaft (3), a limiting front guide (8) and a spring A (9); wherein, the shaft sleeve (2) is of a cylindrical structure; the limiting front guide (8) is an annular external thread nut which is screwed on the lower part of the inner profile of the shaft sleeve (2) and is used for limiting the transmission shaft; the upper part of the transmission shaft (3) is a clamping part, the lower part of the transmission shaft is connected with a cutter, the middle part of the transmission shaft is of a ring groove structure matched with the inner profile of the shaft sleeve (2), and a spring A (9) is arranged in the ring groove; the transmission shaft (3) is in clearance fit with the hole shaft of the shaft sleeve (2), the lower part of the transmission shaft (3) penetrates through the limiting front guide (8), and the limiting is realized through the steel wire check ring (1) embedded in the groove at the lower part of the transmission shaft (3);

the first-stage limiting mechanism comprises a limiting sleeve (6), a limiting nut (4), a spring B (10) and a tooth-shaped clamping ring (11); the limiting nut (4) is a stepped nut and is screwed on the outer profile of the shaft sleeve (2); the tooth-shaped snap ring (11) is of an inner-shaped stepped cylinder structure, the upper part of the tooth-shaped snap ring (11) is sleeved on an outer molded surface with a small diameter at the stepped part of the limiting nut (4), the lower end of the tooth-shaped snap ring (11) is sleeved on an outer molded surface of the shaft sleeve (2), so that a closed cavity is formed between the middle part of the tooth-shaped snap ring (11) and the shaft sleeve (2), and a spring B (10) is arranged in the closed cavity; a clamping groove on one side of the outer profile of the shaft sleeve (2) is matched with a guide block on the inner profile of the tooth-shaped clamping ring (11), so that the tooth-shaped clamping ring (11) is limited to rotate in the radial direction; the limiting sleeve (6) is of a cylindrical structure, and the inner and outer molded surfaces at the upper part of the limiting sleeve are in threaded connection with the outer molded surface of the shaft sleeve (2); the lower end surface of the limiting sleeve (6) is a semi-circular ring surface and is directly contacted with a product during processing; the outer diameters of the limiting sleeve (6) and the tooth-shaped snap ring (11) are the same, and the upper end of the limiting sleeve (6) is meshed with the tooth-shaped snap ring (11) through teeth, so that the limiting sleeve is prevented from radially rotating when the transmission mechanism rotates;

the second-stage limiting mechanism comprises a guide sleeve (7) and a fastening nut (5); the guide sleeve (7) is of a cylindrical structure, and the upper part of the inner profile is in threaded connection with the outer profile of the limiting sleeve (6); the fastening nut (5) is in threaded connection with the limiting sleeve (6), is positioned between the step of the limiting nut (4) and the guide sleeve (7), and realizes the adjustment of the relative position of the limiting sleeve and the end face of the guide sleeve through the self-locking function formed by the double nuts.