CN112077675B

CN112077675B - Method for improving surface quality of turning of assembly matching part of rectifier by polishing

Info

Publication number: CN112077675B
Application number: CN202010980567.5A
Authority: CN
Inventors: 刘随建; 公维勇; 姜豪曾
Original assignee: AECC Shenyang Liming Aero Engine Co Ltd
Current assignee: AECC Shenyang Liming Aero Engine Co Ltd
Priority date: 2020-09-17
Filing date: 2020-09-17
Publication date: 2021-11-16
Anticipated expiration: 2040-09-17
Also published as: CN112077675A

Abstract

A method for improving the surface quality of turning of a rectifier assembly matching part comprises the following steps: step 1, pasting an adhesive tape on a part of a rectifier part which does not need to be ground, and then binding the part of the adhesive tape by using a nylon rope; step 2, pouring the grinding fluid prepared in proportion into a material box; step 3, clamping a lower edge plate on one side of the rectifier part through a finishing clamp, starting the material box to rotate clockwise or anticlockwise after the rectifier part is clamped, starting the pitching function and the head rotating function of the mechanical arm of the finishing equipment again, rotating clockwise or anticlockwise firstly, and then rotating anticlockwise or clockwise, and finishing the finishing processing of the arc surface on one side of the rectifier part; step 4, performing surface changing and clamping on the rectifier part, performing polishing processing on the other side, and repeating the step 3; and 5, washing and drying the rectifier parts. The problems that the clamping blockage occurs when the rectifier is assembled, so that the additional repair situation is frequently needed and the assembly progress is influenced are solved.

Description

Method for improving surface quality of turning of assembly matching part of rectifier by polishing

Technical Field

The invention belongs to the technical field of rectifier surface treatment, and particularly relates to a method for improving the turning surface quality of a rectifier assembly matching part.

Background

The structure of the upper and lower edge plate parts of the rectifier of the aero-engine is designed according to the state of being assembled to an engine casing, a single-stage rectifier is usually designed into an eight-segment type sector, a closed ring is formed by assembling two semicircular casings, after the rectifier and the casing are assembled into a semicircular ring, the lower edge plate part is generally assembled with two semicircular annular sealing parts, and therefore, the circular arc-shaped structures of the upper and lower edge plates of the rectifier have the property of assembling and matching surfaces. Because the upper and lower edge plates of the rectifier are small in size and are in a groove form, and the material is basically deformed high-temperature alloy, the processing is finished by clamping and integrally turning the arc surfaces at two ends at one time, the processing well ensures the requirements of the surface size and position precision of each part, and the integrity of the macroscopic shape is also well ensured. But because of the turning property, the shape of the surface micro texture has certain defects compared with the grinding processing, the prominent expression is that the wave crest of the turning texture is in the form of sharp corner, the wave crest of the grinding texture is in a fillet form, in addition, the turning process is limited by the matching of the performance and parameters of the cutter, and the uncleanness phenomena of surface scale, galling and the like caused by abnormal cutting are often generated, therefore, the assembly of rectifiers often involves "jamming" and blocking phenomena, for which the assembly work is often accompanied by surface sanding, even rubbing work, including cleaning work such as subsequent cleaning, making the assembly inefficient, and because the cleaning work is random passive behavior, the normal quality standard requirement is not required in operation, the hidden quality danger exists, and the use performance is easily influenced, so that the related improvement research needs to be carried out.

Disclosure of Invention

The invention aims to provide a method for improving the surface quality of turning on a rectifier assembly matching part, which adopts the work of improving the surface quality by using a finishing method, changes the texture shape of the assembly matching surface under the condition of ensuring that the geometric precision and the size are not influenced, and thoroughly cleans the scale and galling phenomena on the whole surface, thereby realizing the deep cleaning degree, solving the adverse phenomenon existing in the rectifier assembly and solving the inherent property problem existing in the turning arc surface.

In order to achieve the purpose, the invention adopts the following technical scheme:

a method for improving the surface quality of turning of a rectifier assembly matching part comprises the following steps:

step 1, carrying out adhesive tape pasting treatment on each blade type part of a rectifier part which does not need to be ground, and then binding each blade type part of the adhesive tape by using a nylon rope to prevent the adhesive tape from being pulled apart and falling off in work;

step 2, pouring the grinding materials into a material box of the polishing equipment, adding tap water and the grinding materials simultaneously, starting the material box, discharging the tap water after the self-grinding work of the grinding materials for more than or equal to 10min, pouring the grinding fluid prepared in proportion into the material box, wherein the height of the grinding fluid is more than or equal to the height of the grinding materials;

step 3, starting the pitching function of the mechanical arm of the finishing equipment, moving the head of the mechanical arm to be above the liquid level of the abrasive of the material box of the equipment, and closing the pitching function of the mechanical arm of the finishing equipment; mounting a finishing fixture on the head of a mechanical arm of finishing equipment, mounting a rectifier part on the finishing fixture, clamping a lower edge plate pressing part on one side of the rectifier part through the finishing fixture, starting a material box to rotate clockwise or anticlockwise after the rectifier part is clamped, ensuring that the rotating direction is unchanged in the whole finishing process, and then starting the pitching function and the head rotating function of the mechanical arm of the finishing equipment again to ensure that an arc at the tail end of the rectifier part can be immersed below 50mm of the surface of an abrasive material when rotating to the lowest position of the circumference, rotating clockwise or anticlockwise firstly, and then rotating anticlockwise or clockwise to finish the finishing processing of the arc surface on one side of the rectifier part; firstly, closing the material box, then closing the rotation of the mechanical arm head of the finishing equipment, and moving the mechanical arm head out of the liquid level of the material box by utilizing the pitching function;

step 4, performing surface changing and clamping on the rectifier part, then performing finishing machining on the other side, wherein the parameters and the motion mode are the same as those of the machining on the front side, and repeating the step 3;

step 5, unloading the rectifier part subjected to the two-side finishing from the head of the mechanical arm of the finishing equipment, and removing the adhesive tape; and (4) washing the processed rectifier part by using tap water, and then drying the processed rectifier part by using compressed air to finish the whole finishing process.

And 3, the finishing fixture comprises a fixture pressing plate and a fixture base, the section of the fixture base is F-shaped, the middle lower part of the fixture base is disc-shaped, the finishing fixture is connected with the head of the mechanical arm of the finishing equipment through a disc-shaped part and a bolt, the fixture base is connected with the fixture pressing plate through a connecting plate and a bolt which are positioned on the middle upper part, and the section of the fixture pressing plate is L-shaped.

The invention has the beneficial effects that:

1. the method aims at the phenomena of poor turning surface processing texture and poor surface quality and cleanness state of the assembly matching part of the blade assembly rectifier, improves the turning quality of the installation part of the rectifier, and prevents the problems that the clamping retardation is generated during rectifier assembly, so that the additional repair condition is frequently required and the assembly progress is influenced.

2. The grinding pressure of the free grinding material is small, the surface processing is mainly reflected by the micro grinding effect, the cleaning and clearing effects are more obvious, after the surface is finished by turning and processing the part, the roughness can be reduced by one grade from Ra1.6-Ra1.8 to less than or equal to Ra0.8, the surface micro texture is finer, the sharp corner state of the wave crest is changed into an arc shape, all sharp corners are in a micro rounding state, and all adhesive burrs caused by surface scale and galling are removed to present a bright and smooth degree, so that the assembly meets the smooth requirement, and the additional repairing work is avoided.

3. The change in the dimensional accuracy of the commutator after the finish machining was confirmed by inspection to be substantially free of significant change, and was 0.001mm or less in terms of thickness dimensional influence, so that it was confirmed that it did not affect the level of dimensional positional accuracy obtained by the turning machining.

4. The cost-effective embodiment obtained by the improved operation of the rectifier is as follows: each engine is provided with six levels of rectifiers, each level of rectifiers is eight, the assembly time of the rectifiers is shortened from eight hours before improvement to 0.5 hour, and the assembly cost is greatly reduced.

5. The improved rectifier assembly requires more stable and reliable quality, and has more important significance compared with the assembly mode of random repair before improvement.

Drawings

FIG. 1 is a front view of a blade-shaped protection part of a rectifier finishing clamp according to the present invention;

FIG. 2 is a sectional view of the blade-shaped protection part H-H of the rectifier finishing clamp according to the present invention;

FIG. 3 is a schematic view of a rectifier finishing apparatus of the present invention;

FIG. 4 is a side view of the rectifier finishing fixture clamping the rectifier in accordance with the present invention;

FIG. 5 is a front view of the rectifier clamping fixture of the present invention;

FIG. 6 is a schematic view of the part finishing operation of the rectifier of the present invention;

1-rectifier parts, 2-clamp bases, 3-clamp pressing plates, 4-material boxes and 5-finishing equipment.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in fig. 1 to 6, a method for improving the surface quality of the turning of the fitting part of a rectifier includes the following steps:

step 1, carrying out adhesive tape pasting treatment on each blade type part of the rectifier part 1 which does not need to be ground, and then binding each blade type part of the adhesive tape by using a nylon rope to prevent the adhesive tape from being pulled apart and falling off during working;

step 2, adopting BJG-CZ300 fork shaft type free die finishing equipment for finishing equipment 5, selecting brown corundum spherical coarse abrasive with the size of phi 2mm, pouring the brown corundum spherical coarse abrasive into a material box 4 of the finishing equipment 5, controlling the height to be 2/3 of a container of the material box 4, adding tap water with the height equal to the height of the abrasive, starting the material box 4, carrying out autogenous grinding work on the abrasive for 30min, and then discharging the tap water; preparing HYB grinding fluid and water according to the volume of 3%, and pouring the prepared grinding fluid into a material box 4, wherein the height of the grinding fluid is equal to that of the grinding material;

the BJG-CZ300 fork shaft type free mold finishing equipment 5 comprises a cantilever machine head and a barrel-shaped material box 4, wherein the cantilever machine head can realize a pitching function, the rectifier part 1 is convenient to clamp and adjust the position of the rectifier part 1 in the material box 4, the tail end of the cantilever machine head is of a disc structure, the cantilever machine head has a clamp function of mounting different structures, meanwhile, the disc can realize a rotating function when in work, and the rectifier part 1 is rotated and ground clockwise or anticlockwise in the material box 4; the cylindrical bin 4 is used for bearing abrasive and can rotate clockwise or anticlockwise so that the abrasive in the bin 4 uniformly participates in grinding;

step 3, starting a mechanical arm pitching function of the polishing equipment 5, moving the head of the mechanical arm to be above the abrasive liquid level of the equipment material box 4, and closing the mechanical arm pitching function of the polishing equipment 5; installing a finishing fixture on the head of a mechanical arm of finishing equipment 5, installing a rectifier part 1 on the finishing fixture, clamping a lower edge plate pressing part on one side of the rectifier part 1 through the finishing fixture, starting a material box 4 to rotate clockwise or anticlockwise after the rectifier part 1 is clamped, ensuring that the rotating direction of the whole finishing process is unchanged, setting the rotating speed of the material box 4 to be 52 r/min, then starting the pitching function and the head rotating function of the mechanical arm again, enabling an arc at the tail end of the rectifier part 1 to be immersed below 50mm of the surface of an abrasive material when rotating to the lowest position of the circumference, rotating clockwise for 15min, then rotating anticlockwise for 15min, setting the rotating speeds of the mechanical arms in two directions to be 88 r/min, and finishing the arc surface on one side through a grinding process of 30min in total; the material box 4 is closed firstly, then the rotation of the mechanical arm head of the polishing equipment 5 is closed, and the mechanical arm head is moved out of the liquid level of the material box 4 by utilizing the pitching function;

step 4, performing surface changing and clamping on the rectifier part 1, then performing finishing machining on the other side, wherein the parameters and the motion mode are the same as those of the machining on the front side, and repeating the step 3;

step 5, detaching the rectifier part 1 with both sides finished, from the head of the mechanical arm, and removing the adhesive tape; and (3) washing the processed rectifier part 1 by using tap water, and then drying by using compressed air to finish the whole finishing process.

And 3, the finishing fixture comprises a fixture pressing plate 3 and a fixture base 2, the section of the fixture base 2 is F-shaped, the middle lower part of the fixture base 2 is disc-shaped, the finishing fixture is connected with the head of the mechanical arm of the finishing equipment 5 through a disc-shaped part and a bolt, the fixture base 2 is connected with the fixture pressing plate 3 through a connecting plate and a bolt which are positioned on the middle upper part, and the section of the fixture pressing plate 3 is L-shaped.

Claims

1. A method for improving the surface quality of turning at the assembly matching part of a rectifier is characterized by comprising the following steps:

step 3, starting the pitching function of the mechanical arm of the finishing equipment, moving the head of the mechanical arm to be above the liquid level of the abrasive of the material box of the equipment, and closing the pitching function of the mechanical arm of the finishing equipment; mounting a finishing fixture on the head of a mechanical arm of finishing equipment, mounting a rectifier part on the finishing fixture, clamping a lower edge plate pressing part on one side of the rectifier part through the finishing fixture, starting a material box to rotate clockwise or anticlockwise after the rectifier part is clamped, ensuring that the rotating direction is unchanged in the whole finishing process, and then starting the pitching function and the head rotating function of the mechanical arm of the finishing equipment again to ensure that an arc at the tail end of the rectifier part can be immersed below 50mm of the surface of an abrasive material when rotating to the lowest position of the circumference, rotating clockwise or anticlockwise firstly, and then rotating anticlockwise or clockwise to finish the finishing processing of the arc surface on one side of the rectifier part; firstly, closing the material box, then closing the rotation of the mechanical arm head of the finishing equipment, and moving the mechanical arm head out of the liquid level of the material box by utilizing the pitching function; the polishing clamp comprises a clamp pressing plate and a clamp base, the cross section of the clamp base is F-shaped, the middle lower part of the clamp base is disc-shaped, the polishing clamp is connected with the head of the mechanical arm of the polishing equipment through a disc-shaped part and a bolt, the clamp base is connected with the clamp pressing plate through a connecting plate and a bolt which are positioned at the middle upper part, and the cross section of the clamp pressing plate is L-shaped;