CN113953897B - Grinding process for thin-wall steel narrow-deep-groove nitrided surface of aircraft engine - Google Patents

Grinding process for thin-wall steel narrow-deep-groove nitrided surface of aircraft engine Download PDF

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CN113953897B
CN113953897B CN202111326041.6A CN202111326041A CN113953897B CN 113953897 B CN113953897 B CN 113953897B CN 202111326041 A CN202111326041 A CN 202111326041A CN 113953897 B CN113953897 B CN 113953897B
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groove
grinding
grinding wheel
machining
wall
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CN113953897A (en
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秦杰
黄俊华
曾庆双
黄茂林
郭书壹
陈艳芳
郑学著
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AECC South Industry Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/02—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/20—Drives or gearings; Equipment therefor relating to feed movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/006—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation taking regard of the speed
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

The invention discloses a grinding process of a nitriding surface of a thin-wall steel narrow deep groove of an aircraft engine, which comprises the following steps: enabling the grinding wheel to be close to the bottom of the groove, and carrying out primary grinding processing on the groove wall of the first side; retracting the grinding wheel in the direction far away from the groove wall of the first side, wherein the retracting is 0.015-0.025 mm, feeding the grinding wheel to the bottom of the groove, and grinding the bottom of the groove for the second time; retracting the grinding wheel in the direction far away from the bottom of the groove, feeding the grinding wheel to the groove wall of the second side groove, and grinding the groove wall of the second side groove for the third time; and retracting the grinding wheel in the direction far away from the groove wall of the first side, wherein the retracting is 0.015-0.025 mm, feeding the grinding wheel to the bottom of the groove, and grinding the bottom of the groove for the fourth time to finish grinding. According to the grinding process of the narrow deep groove nitriding surface of the aircraft engine thin-wall steel, the cutting feed mode of 0.015-0.025 mm of tool withdrawal is adopted, the processing route is optimized, the processing grinding force of the narrow deep groove surface is reduced, and the phenomena that the grinding wheel is excessively abraded at the switching R position of the narrow deep groove and large grinding stress is generated are avoided.

Description

Grinding process for thin-wall steel narrow-deep-groove nitrided surface of aircraft engine
Technical Field
The invention relates to the field of manufacturing of aero-engines, in particular to a grinding process for a thin-wall steel type narrow and deep groove nitrided surface of an aero-engine.
Background
The steel parts of the aircraft engine part need surface grinding processing because the processing surface is nitrided and the requirements of dimensional tolerance and surface roughness are very strict. Taking a certain part as an example, the material is 38CrMoAlA, the side surface of a piston ring groove at the 11-position of the outer circle is a nitriding surface, the depth is required to be 0.4-0.7, the surface HR30N is more than or equal to 80, the core hardness d = 3.6-3.3, and the nitriding is allowed for the groove bottom, the outer circle and the rest grooves on the outer circle of the piston ring. The existing processing technology adopts groove grinding, but after the existing technical scheme is processed, because the nitrided surface is brittle, when the part is subjected to larger stress and local overheating, part of the part generates surface cracks, or the surface delayed cracks are induced during trial run and use. The existing grinding processing of the narrow groove nitriding surface of the precision steel part of the aero-engine generally comprises the steps of firstly processing the bottom end surface of a piston ring groove, then processing the side wall and an R fillet of the piston ring groove, wherein the feed amount of rough grinding is at least 3 threads, and the feed amount of fine grinding is at least 1 thread.
The existing processing method has the following defects: (1) The machined surface of the part is a nitrided layer, the hardness is high, and the grinding force is too large due to too large feed amount, so that the grinding stress is higher. After machining, the grinding residual stress is too large, and the part is cracked. (2) As shown in fig. 1, when grinding the side wall of the piston ring groove, the side surface and the bottom of the grinding wheel are both in actual contact with the side wall and the bottom end surface of the grinding part substrate, and a large grinding force is generated in the machining process.
Disclosure of Invention
The invention provides a grinding process of a nitrided surface of thin-wall steel of an aircraft engine, which aims to solve the technical problem that cracks are generated in grinding of parts of the aircraft engine or delayed cracks are generated after the parts of the aircraft engine are used.
The technical scheme adopted by the invention is as follows:
a grinding process for a nitrided surface of thin-wall steel of an aircraft engine comprises the following steps:
enabling the grinding wheel to be close to the bottom of the groove, and grinding the groove wall of the first side for the first time, wherein the bottom of the grinding wheel is not in contact with the R fillet, and a gap is formed between the bottom of the grinding wheel and the bottom of the groove;
retracting the grinding wheel in the direction far away from the groove wall of the first side by 0.015-0.025 mm, feeding the grinding wheel to the bottom of the groove, and grinding the bottom of the groove for the second time, wherein the grinding wheel is in clearance fit with the groove wall of the first side and the groove wall of the second side;
retracting the grinding wheel in the direction far away from the bottom of the groove, feeding the grinding wheel to the wall of the second side groove, and grinding the wall of the second side groove for the third time, wherein the bottom of the grinding wheel is not contacted with the R fillet;
and retracting the grinding wheel in the direction far away from the wall of the second side groove, wherein the retracting is 0.015-0.025 mm, feeding the grinding wheel to the bottom of the groove, and grinding the bottom of the groove for the fourth time to finish grinding.
Furthermore, the tool retracting direction of the grinding wheel to the direction far away from the first side groove wall is 0.02mm; and/or the tool withdrawal of the grinding wheel to the direction far away from the second side groove wall is 0.02mm.
Furthermore, when the grinding wheel is close to the bottom of the groove, the distance from the grinding wheel to the bottom is 0.2 mm-0.3 mm.
Furthermore, the tool retracting direction of the grinding wheel far away from the bottom of the groove is 0.2 mm-0.3 mm.
Further, the rotating speed of the grinding wheel is less than or equal to 35m/s.
Further, the first grinding process adopts rough machining and then finish machining; the machining allowance of rough machining is 0.05 mm-0.06 mm, and the cutting allowance is 0.01mm; the finishing allowance is 0.04 mm-0.05 mm, and the cutting depth is 0.005mm.
Further, the second grinding process adopts rough machining and then finish machining; the machining allowance of rough machining is 0.05 mm-0.06 mm, and the cutting allowance is 0.01mm; the machining allowance of finish machining is 0.04 mm-0.05 mm, and the cutting allowance is 0.005mm.
Further, the third grinding process adopts rough machining and then finish machining; the machining allowance of rough machining is 0.05 mm-0.06 mm, and the cutting allowance is 0.01mm; the machining allowance of finish machining is 0.04 mm-0.05 mm, and the cutting allowance is 0.005mm.
Further, the fourth grinding process adopts rough machining and then finish machining; the machining allowance of rough machining is 0.05 mm-0.06 mm, and the cutting allowance is 0.01mm; the machining allowance of finish machining is 0.04 mm-0.05 mm, and the cutting allowance is 0.005mm.
The invention has the following beneficial effects:
the grinding process of the narrow and deep groove nitriding surface of the thin-wall steel of the aircraft engine comprises the steps of firstly, when a first side groove wall is machined, only the side surface of a grinding wheel is in contact with the first side groove wall, the bottom of the grinding wheel is not in contact with an R fillet, a certain gap is formed between the bottom of the grinding wheel and the bottom of the grinding wheel, cooling liquid can enter a transfer joint of the R fillet and fully cool the transfer joint, and the problems that the temperature of the R fillet is high, the stress is overlarge and cracks are generated are avoided. Secondly, after retracting 0.015 mm-0.025 mm to the direction of keeping away from the first side cell wall, feeding to the tank bottom, carrying out the abrasive machining for the second time to the tank bottom, only the emery wheel bottom contacts with the tank bottom and grinds, and the emery wheel all clearance fit with first side cell wall, second side cell wall, avoids narrow deep trouth too much wearing and tearing of emery wheel to appear in the switching department at the R fillet equally, the coolant liquid of also being convenient for cools off, reduces the production of grinding stress. And withdrawing the cutter in the direction away from the bottom of the groove, feeding the cutter to the groove wall of the second side, and grinding the groove wall of the second side for the third time, wherein the side surface of the grinding wheel is in contact with the groove wall of the second side in the same way, and the bottom of the grinding wheel is not in contact with the R fillet. And finally, after the grinding wheel retreats by 0.015-0.025 mm in the direction away from the groove wall of the second side, feeding the grinding wheel to the bottom of the groove, and grinding the bottom of the groove for the fourth time so as to completely grind the bottom of the groove. According to the grinding process of the narrow deep groove nitriding surface of the aircraft engine thin-wall steel, by adopting the feed mode of withdrawing the cutter by 0.015-0.025 mm and optimizing the processing route, the grinding force of the narrow deep groove surface processing is reduced, excessive abrasion of the grinding wheel at the switching R position of the narrow deep groove is avoided, and the generation of larger grinding stress is avoided, so that the quality problems of stress cracks and the narrow deep groove caused by local overheating of the position are solved, the stability of the grinding process and the quality of parts are ensured, and the scrapping and quality loss of the parts are reduced.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a prior art cup portion process of the present invention;
FIG. 2 is a single narrow deep groove grinding process of the preferred embodiment 1 of the present invention, and
FIG. 3 is a schematic diagram of an engine thin-walled steel part according to the preferred embodiment 1 of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
FIG. 1 is a schematic view of a prior art cup portion process of the present invention; fig. 2 is a single narrow deep groove grinding process of the preferred embodiment 1 of the invention, and fig. 3 is a schematic view of the thin-walled steel engine part of the preferred embodiment 1 of the invention.
As shown in fig. 2, the grinding process of the nitrided surface of the narrow and deep groove of the thin-walled steel of the aircraft engine of the embodiment includes the following steps:
enabling the grinding wheel to be close to the bottom of the groove, and carrying out primary grinding processing on the groove wall of the first side;
retracting the grinding wheel in the direction far away from the groove wall of the first side, wherein the retracting is 0.015-0.025 mm, feeding the grinding wheel to the bottom of the groove, and grinding the bottom of the groove for the second time;
retracting the grinding wheel in the direction far away from the bottom of the groove, feeding the grinding wheel to the groove wall of the second side groove, and grinding the groove wall of the second side groove for the third time;
and retracting the grinding wheel in the direction far away from the wall of the second side groove, wherein the retracting is 0.015-0.025 mm, feeding the grinding wheel to the bottom of the groove, and grinding the bottom of the groove for the fourth time to finish grinding.
The grinding process of the narrow deep groove nitriding surface of the aircraft engine thin-wall steel comprises the steps of firstly, when a first side groove wall is machined, only the side surface of a grinding wheel is in contact with the first side groove wall, the bottom of the grinding wheel is not in contact with an R fillet, a certain gap is formed between the bottom of the grinding wheel and the bottom of the grinding wheel, cooling liquid can enter a junction of the R fillet and fully cool the junction, and the problems that the temperature of the R fillet is high, the stress is overlarge and cracks are generated are avoided. Secondly, after retracting 0.015 mm-0.025 mm to the direction of keeping away from the first side cell wall, feeding to the tank bottom, carrying out the abrasive machining for the second time to the tank bottom, only the emery wheel bottom contacts with the tank bottom and grinds, and the emery wheel all clearance fit with first side cell wall, second side cell wall, avoids narrow deep trouth too much wearing and tearing of emery wheel to appear in the switching department at the R fillet equally, the coolant liquid of also being convenient for cools off, reduces the production of grinding stress. And withdrawing the cutter in the direction away from the bottom of the groove, feeding the cutter to the groove wall of the second side, and grinding the groove wall of the second side for the third time, wherein the side surface of the grinding wheel is in contact with the groove wall of the second side in the same way, and the bottom of the grinding wheel is not in contact with the R fillet. And finally, after the grinding wheel retreats by 0.015-0.025 mm in the direction away from the groove wall of the second side, feeding the grinding wheel to the bottom of the groove, and grinding the bottom of the groove for the fourth time so as to completely grind the bottom of the groove. According to the grinding process of the nitriding surface of the narrow deep groove of the thin-wall steel of the aircraft engine, by adopting a feed mode of withdrawing the cutter by 0.015-0.025 mm and optimizing a processing route, the grinding force of the surface processing of the narrow deep groove is reduced, excessive abrasion of a grinding wheel at the switching part of an R fillet of the narrow deep groove is avoided, and large grinding stress is generated, so that the quality problems of stress cracks and the narrow deep groove caused by local overheating of the part are solved, the stability of the grinding process and the quality of parts are ensured, and the scrapping and quality loss of the parts are reduced.
Preferably, the grinding process of the narrow deep groove nitriding surface of the thin-wall steel of the aircraft engine comprises the following steps:
s1, enabling a grinding wheel to be close to the bottom of a groove, and carrying out primary grinding processing on the groove wall of a first side;
s2, retracting the grinding wheel in the direction far away from the groove wall of the first side, wherein the retracting is 0.015-0.025 mm, feeding the grinding wheel to the bottom of the groove, and grinding the bottom of the groove for the second time;
s3, retracting the grinding wheel in the direction far away from the bottom of the groove, feeding the grinding wheel to the groove wall of the second side, and grinding the groove wall of the second side for the third time;
and S4, retracting the grinding wheel in the direction far away from the groove wall of the first side, wherein the retracting is 0.015-0.025 mm, feeding the grinding wheel to the bottom of the groove, and grinding the bottom of the groove for the fourth time to finish grinding.
Preferably, the tool retracting direction of the grinding wheel far away from the groove wall of the first side is 0.02mm; and/or. The tool retracting of the grinding wheel towards the direction far away from the wall of the second side groove is 0.02mm. The grinding wheel retreats towards the direction far away from the groove wall on the first sideThe knife is 0.02mm, and the knife retreats twice with each knife retreating being 0.01mm. In the actual grinding process, the grinding wheel retreats 0.015-0.025 mm towards the direction far away from the groove wall of the first side and then feeds towards the bottom of the groove, so that a step with a smaller size is generated at the switching part of the R fillets of the groove wall and the groove bottom, but R1.5 +/-0.5 and R0.5 of the R fillets are met 0 0 .5 The size requirement of (2).
In this embodiment, when the grinding wheel is close to the bottom of the groove, the distance from the grinding wheel to the bottom is 0.2mm to 0.3mm. A gap of 0.2-0.3 mm is formed between the bottom of the grinding wheel and the bottom of the grinding wheel, and the cooling liquid can enter the switching part of the R fillet and fully cool the switching part, so that the problems that the temperature of the R fillet is high, the stress is overlarge and cracks are generated are avoided.
In the embodiment, the tool retracting direction of the grinding wheel far away from the bottom of the groove is 0.2 mm-0.3 mm. The tool retracting direction of the grinding wheel to the direction far away from the groove bottom is 0.2 mm-0.3 mm, so that a gap of 0.2 mm-0.3 mm is formed between the bottom of the grinding wheel and the bottom of the grinding wheel when the groove wall of the second side is ground, the cooling is facilitated, and the generation of stress and cracks is avoided.
In this embodiment, the rotational speed of the grinding wheel is not more than 35m/s. The grinding wheel adopts a common abrasive grinding wheel, when the grinding speed Vs is more than 35m/s, the bonding of the tops of the grinding wheel abrasive particles is intensified, and the service life and the grinding quality of the grinding wheel are influenced. The grinding wheel can not keep a self-sharpening state for a long time, and the cutting performance is reduced after passivation, so that the grinding force and the grinding heat are increased, and the surface of a part is burnt. Therefore, the grinding speed does not exceed 35m/s. The grinding wheel adopts a high-speed gear, when the gears are in middle and low speeds, the grinding force of the part grinding wheel is too small, abrasive particles are smoothly rubbed and extruded on the surface of the part, the cutting performance of the grinding wheel is influenced, and the processing efficiency of the part is reduced.
In the embodiment, the first grinding process adopts rough machining and then finish machining; the machining allowance of rough machining is 0.05 mm-0.06 mm, and the cutting allowance is 0.01mm; the machining allowance of finish machining is 0.04 mm-0.05 mm, and the cutting allowance is 0.005mm. The first grinding process adopts a grinding mode of firstly rough machining and then finish machining, the machining allowance of the rough machining is 0.04-0.05 mm and is equivalent to the machining allowance of the rough machining, compared with the conventional grinding process, the first grinding process increases the finish machining removal allowance and reduces the removal allowance of the rough machining, and therefore the stress condition of the groove wall of the first side is controlled through the finish machining in the grinding process of the whole groove wall of the first side. The finish machining tool is less than the rough machining tool, so that the grinding heat is reduced, the R-shaped joint of the grinding wheel can be kept in a sharp state for a long time, and the groove wall surface of the narrow and deep groove is not easy to burn or delay stress crack due to local overheating. In addition, in the finish machining process, the cutting depth is only 0.005mm, so that the stress of the first side groove wall is reduced, namely, only small grinding stress is generated in each cutting, and the generation of cracks on the first side groove wall is reduced.
In the embodiment, the second grinding process adopts rough machining and then finish machining; the machining allowance of rough machining is 0.05 mm-0.06 mm, and the cutting allowance is 0.01mm; the machining allowance of finish machining is 0.04 mm-0.05 mm, and the cutting allowance is 0.005mm. Similarly, the grinding stress generated at the part of the bottom of the groove is reduced by controlling the machining allowance and the cutting allowance, so that the grinding stress is avoided.
In the embodiment, the third grinding process adopts rough machining and then finish machining; the machining allowance of rough machining is 0.05 mm-0.06 mm, and the cutting allowance is 0.01mm; the machining allowance of finish machining is 0.04 mm-0.05 mm, and the cutting allowance is 0.005mm. Similarly, the grinding stress generated by the second side groove wall is reduced by controlling the machining allowance and the cutting depth, so that the grinding stress is avoided.
In the embodiment, the fourth grinding process adopts rough machining and then finish machining; the machining allowance of rough machining is 0.05 mm-0.06 mm, and the cutting allowance is 0.01mm; the finishing allowance is 0.04 mm-0.05 mm, and the cutting depth is 0.005mm. In the second grinding, the groove bottom portion near the first side groove wall is ground, and after the fourth grinding, the remaining machining allowance of the groove bottom portion is removed.
Preferably, the thin-wall steel part of the engine is made of 38CrMoAlA material, 11 narrow deep grooves are sequentially arranged on the outer circle of the thin-wall steel part, the 11 narrow deep grooves are machined through the grinding process, magnetic powder inspection is carried out on the thin-wall steel part of the engine after machining, and the groove bottom of the narrow deep groove after grinding, the switching part of the R round angle between the groove bottom and the side face of the groove and the two side faces of the groove are intensively inspected. The implementation and verification of the processing scheme are carried out on 38 pieces in two batches, and the condition of scrapping caused by grinding cracks does not occur.
Examples
Example 1
As shown in fig. 3, the outer circle end face of the thin-walled steel engine part is machined, the radial dimension is guaranteed to be 185 (-0.07,0), narrow and deep grooves of 11 grooves on the outer circle are sequentially ground and machined from one end, a grinding wheel needs to be ground before each narrow and deep groove is machined, and as shown in fig. 2, the grinding process of each narrow and deep groove comprises the following steps:
s1, enabling a grinding wheel to be close to the bottom of a groove, enabling the distance from the grinding wheel to the bottom to be 0.2mm, grinding the wall of the first side groove for the first time, enabling the rotating speed of the grinding wheel to be 35m/S, firstly adopting rough machining, enabling the machining allowance of the rough machining to be 0.05-0.06 mm, enabling the cutting allowance to be 0.01mm, then adopting finish machining, enabling the machining allowance of the finish machining to be 0.04-0.05 mm, enabling the cutting allowance to be 0.005mm, and ensuring the groove widths of the 1 st groove and the 11 th groove to be 0.04mm
Figure GDA0004035019710000053
The groove width of the other grooves is->
Figure GDA0004035019710000054
S2, retracting the grinding wheel in the direction far away from the groove wall of the first side by 0.02mm, feeding the grinding wheel to the bottom of the groove, grinding the bottom of the groove for the second time, wherein rough machining is firstly adopted, the machining allowance of the rough machining is 0.05-0.06 mm, the tool depth is 0.01mm, finish machining is then adopted, the machining allowance of the finish machining is 0.04-0.05 mm, the tool depth is 0.005mm, and the radial size of the excircle of the second grinding part is ensured to be 0.04-0.05 mm
Figure GDA0004035019710000051
S3, retracting the grinding wheel in the direction far away from the bottom of the groove, wherein the retracting is 0.2mm, feeding the grinding wheel to the groove wall of the second side, and grinding the groove wall of the second side for the third time, wherein rough machining is firstly adopted and then rough machining is carried outThe machining allowance is 0.05 mm-0.06 mm, the cutting depth is 0.01mm, then finish machining is adopted, the machining allowance of finish machining is 0.04 mm-0.05 mm, the cutting depth is 0.005mm, wherein the groove width from the 1 st groove to the 11 th groove is ensured to be
Figure GDA0004035019710000052
S4, retracting the grinding wheel in the direction far away from the groove wall of the first side by 0.02mm, feeding the grinding wheel to the bottom of the groove, grinding the bottom of the groove for the fourth time, wherein rough machining is firstly adopted, the machining allowance of the rough machining is 0.05-0.06 mm, the cutting depth is 0.01mm, and finish machining is then adopted, the machining allowance of the finish machining is 0.04-0.05 mm, the cutting depth is 0.005mm, and the radial size of an excircle is ensured to be 0.04-0.05 mm
Figure GDA0004035019710000061
And finishing grinding.
Comparative example 1
The difference from the embodiment 1 is that S1, a grinding wheel directly grinds and processes the bottom of the bottom groove; s2, feeding the grinding wheel in the direction of the groove wall of the first side, and grinding the groove wall of the first side; and S3, feeding the grinding wheel in the direction of the second side groove wall, and grinding the second side groove wall, wherein the grinding method in each step is the same as that in the embodiment 1, namely, rough machining is performed firstly, and then finish machining is performed.
Comparative example 2
In contrast to example 1, the first grinding, the second grinding, the third grinding, and the fourth grinding were performed with a machining allowance of 0.07mm to 0.08mm and a bite of 0.03mm for the rough machining, and with a machining allowance of 0.02mm to 0.03mm and a bite of 0.01mm for the finish machining.
The magnetic powder inspection was performed on the above example 1, comparative example 1 and comparative example 2, and the results were: none of the 11 slots of example 1 exhibited cracking and surface burn, and no time-delayed stress cracking when reviewed in subsequent use. Comparative example 1 exhibited surface burn and cracks, and in subsequent use, exhibited delayed stress cracking. The surface of comparative document 2 was not burned, but cracks occurred, and delayed stress cracks occurred in the subsequent use.
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 (9)

1. A grinding process for a narrow deep groove nitriding surface of thin-wall steel of an aircraft engine is characterized by comprising the following steps:
enabling the grinding wheel to be close to the bottom of the groove, and grinding the groove wall of the first side for the first time, wherein the bottom of the grinding wheel is not in contact with the R fillet, and a gap is formed between the bottom of the grinding wheel and the bottom of the groove;
retracting the grinding wheel in the direction far away from the groove wall of the first side by 0.015-0.025 mm, feeding the grinding wheel to the bottom of the groove, and grinding the bottom of the groove for the second time, wherein the grinding wheel is in clearance fit with the groove wall of the first side and the groove wall of the second side;
retracting the grinding wheel in the direction far away from the bottom of the groove, feeding the grinding wheel to the wall of the second side groove, and grinding the wall of the second side groove for the third time, wherein the bottom of the grinding wheel is not contacted with the R fillet;
and withdrawing the cutter of the grinding wheel in the direction far away from the wall of the second side groove, wherein the cutter withdrawal is 0.015-0.025 mm, feeding the cutter to the bottom of the groove, and grinding the bottom of the groove for the fourth time to finish grinding.
2. A grinding process of a nitrided surface of a narrow deep groove of the type of aircraft engine thin-walled steel according to claim 1,
the tool retracting direction of the grinding wheel to the direction far away from the first side groove wall is 0.02mm; and/or
The tool retracting direction of the grinding wheel far away from the wall of the second side groove is 0.02mm.
3. A grinding process of a nitrided surface of a narrow deep groove of the type of aircraft engine thin-walled steel according to claim 1,
and when the grinding wheel is close to the bottom of the groove, the distance from the grinding wheel to the bottom of the groove is 0.2-0.3 mm.
4. A grinding process of a nitrided surface of a narrow deep groove of the type of aircraft engine thin-walled steel according to claim 1,
the tool retracting direction of the grinding wheel far away from the bottom of the groove is 0.2 mm-0.3 mm.
5. A grinding process of a nitrided surface of a narrow deep groove of the type of aircraft engine thin-walled steel according to claim 1,
the rotating speed of the grinding wheel is less than or equal to 35m/s.
6. A grinding process of a nitrided face of a narrow deep groove of the type of aircraft engine thin wall steel according to claim 5,
the first grinding processing adopts rough processing and then finish processing;
the machining allowance of the rough machining is 0.05 mm-0.06 mm, and the tool bite is 0.01mm;
the machining allowance of the fine machining is 0.04 mm-0.05 mm, and the cutting allowance is 0.005mm.
7. A grinding process of a nitrided surface of a narrow deep groove of the type of aircraft engine thin-walled steel according to claim 1,
the second grinding process adopts rough machining and then finish machining;
the machining allowance of the rough machining is 0.05 mm-0.06 mm, and the cutting allowance is 0.01mm;
the finishing allowance is 0.04 mm-0.05 mm, and the cutting depth is 0.005mm.
8. A grinding process of a nitrided surface of a narrow deep groove of the type of aircraft engine thin-walled steel according to claim 1,
the third grinding process adopts rough machining and then finish machining;
the machining allowance of the rough machining is 0.05 mm-0.06 mm, and the cutting allowance is 0.01mm;
the machining allowance of the fine machining is 0.04 mm-0.05 mm, and the cutting allowance is 0.005mm.
9. A grinding process of a nitrided surface of a narrow deep groove of the type of aircraft engine thin-walled steel according to claim 1,
the fourth grinding process adopts rough machining and then finish machining;
the machining allowance of the rough machining is 0.05 mm-0.06 mm, and the cutting allowance is 0.01mm;
the machining allowance of the fine machining is 0.04 mm-0.05 mm, and the cutting allowance is 0.005mm.
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