CN115592176A - Machining method for high-temperature alloy double-layer bearing anti-rotation groove - Google Patents
Machining method for high-temperature alloy double-layer bearing anti-rotation groove Download PDFInfo
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- CN115592176A CN115592176A CN202211410723.XA CN202211410723A CN115592176A CN 115592176 A CN115592176 A CN 115592176A CN 202211410723 A CN202211410723 A CN 202211410723A CN 115592176 A CN115592176 A CN 115592176A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Abstract
A high-temperature alloy double-layer bearing anti-rotation groove machining method comprises the following steps: roughly milling a bottom layer bearing groove; firstly, positioning and pressing the process edge of the small-diameter end of the bearing seat by using a tool, aligning the excircle and the end surface of the large-diameter end of the bearing seat, ensuring that the circle run-out is not more than 0.02mm, then feeding from top to bottom in the axial direction by adopting a milling cutter with the diameter of 4mm, wherein the rotation speed of the milling cutter is 1269r/min, and the feeding amount is 100mm/min; finely milling a bottom layer bearing groove; feeding a milling cutter with the diameter of 4mm in a mode of retracting every time the milling cutter feeds 3mm, wherein the rotation speed of the milling cutter is 700r/min, and the feeding amount is 80mm/min; roughly milling an upper layer bearing groove; milling the interference preventing grooves layer by using a milling cutter with the diameter of 3mm, reserving a margin of 0.1mm for finish milling, wherein the rotation speed of the milling cutter is 1000r/min, and the feeding amount is 40mm/min; finely milling an upper layer bearing groove; and (3) adopting a phi-3 mm spiral angle end mill with a 28-35 degrees angle to perform contour milling along the axial direction perpendicular to the axis of the part, removing 0.1mm of allowance, wherein the rotation speed of the milling cutter is 1300r/min, and the feed rate is 60mm/min.
Description
Technical Field
The invention belongs to the technical field of manufacturing of parts of aero-engines, and particularly relates to a machining method of a high-temperature alloy double-layer bearing anti-rotation groove.
Background
Along with the requirement on the performance of the aero-engine, the usage amount of the high-temperature alloy in parts of the aero-engine is increased, particularly, a rotor part in the aero-engine is a main application part of the high-temperature alloy, and the GH4169 high-temperature alloy is taken as an example, so that the high-temperature alloy has the characteristics of good comprehensive mechanical property and excellent forging, heat treatment and welding process performances, but has the characteristic of difficult processing, particularly easily generates a cutter sticking phenomenon in the processing process, further causes the serious hardening phenomenon of a processing surface, easily generates large deformation and distortion of the processed part, and is not easy to ensure the processing precision.
Taking GH4169 high-temperature alloy double-layer bearing parts as an example, the parts belong to annular thin-wall structural parts, anti-rotation grooves need to be machined on the parts, and at present, the methods are mainly realized by broaching machining, electric spark machining or electrolytic machining. However, when the broaching method is adopted, the component is easy to generate broaching deformation due to the generation of large cutting force, and the anti-rotation grooves with different sizes are required to be matched with a group of broaches separately, so that the manufacturing cost of the broaches is high, and the economical efficiency of the broaching is poor. When the electric spark machining mode is adopted, the contact area of an electric spark machining electrode and a part is large, so that the discharge area is limited, the problem of uneven allowance removal exists, segmented and graded machining is required to be completed in the machining length, and the part is easy to generate large deformation; in addition, when the electric discharge machining is performed, a remelted layer is generated on the surface of the part, so that the texture of the metal surface becomes uneven, microcracks are easy to generate, and the surface quality of the part is reduced. When the electrolytic machining mode is adopted, the clamping of the parts is difficult due to the structural limitation of the parts, so that the design and the correction of a cathode and a clamp of electrolytic machining equipment are also difficult, the preparation period of electrolytic machining is particularly long, and the machining cost is highest, so that the electrolytic machining mode is only suitable for the production of parts in small batches.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a machining method for an anti-rotation groove of a high-temperature alloy double-layer bearing, which adopts an optimized milling mode, can avoid the phenomenon of cutter sticking in the machining process, avoid the serious hardening phenomenon of a machined surface, avoid the large deformation and distortion of a machined part and ensure the machining precision of the part.
In order to achieve the purpose, the invention adopts the following technical scheme: a machining method for an anti-rotation groove of a high-temperature alloy double-layer bearing comprises the following steps:
the method comprises the following steps: rough milling of bottom layer bearing groove
Firstly, positioning and pressing the process edge of the small-diameter end of the bearing seat by using a tool, aligning the excircle and the end surface of the large-diameter end of the bearing seat, ensuring that the circle run-out is not more than 0.02mm, then feeding from top to bottom in the axial direction by adopting a milling cutter with the diameter of 4mm, wherein the rotation speed of the milling cutter is 1269r/min, and the feeding amount is 100mm/min;
step two: finish milling bottom layer bearing groove
Feeding a milling cutter with the diameter of 4mm in a mode of retracting every time the milling cutter feeds 3mm, wherein the rotation speed of the milling cutter is 700r/min, and the feeding amount is 80mm/min;
step three: roughly milling upper bearing groove
Milling the interference preventing grooves layer by using a milling cutter with the diameter of 3mm, reserving a margin of 0.1mm for finish milling, wherein the rotation speed of the milling cutter is 1000r/min, and the feeding amount is 40mm/min;
step four: finish milling upper bearing groove
And (3) adopting a phi-3 mm spiral angle end mill with a 28-35 degrees angle to perform contour milling along the axial direction perpendicular to the axis of the part, removing 0.1mm of allowance, wherein the rotation speed of the milling cutter is 1300r/min, and the feed rate is 60mm/min.
The invention has the beneficial effects that:
according to the machining method for the anti-rotation groove of the high-temperature alloy double-layer bearing, an optimized milling machining mode is adopted, the phenomenon of cutter adhesion can be avoided in the machining process, the phenomenon of serious hardening of a machined surface is avoided, the machined part is prevented from being greatly deformed and distorted, and the machining precision of the part is ensured.
Drawings
FIG. 1 is a diagram showing the positional relationship between a double-layer bearing rotation-preventing groove and a bearing seat;
in the figure, 1-bearing seat, 2-double layer bearing anti-rotation slot.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
In this embodiment, as shown in fig. 1, 4 double-layer bearing anti-rotation grooves 2 are included in an inner hole of phi 203mm away from an end surface of a bearing seat 1 by 50mm, the width of each double-layer bearing anti-rotation groove 2 is 40mm, each double-layer bearing anti-rotation groove 2 is provided with a round chamfer of R1.5mm, the position degree is 0.1mm, the double-layer bearing anti-rotation grooves 2 are located on an arc-shaped surface of the inner hole of phi 203mm, and the circumferential distribution of materials is uneven.
A machining method for an anti-rotation groove of a high-temperature alloy double-layer bearing comprises the following steps:
the method comprises the following steps: rough milling of bottom layer bearing groove
Firstly, positioning and pressing the technical edge of the small-diameter end of the bearing seat by using a tool, aligning the excircle and the end surface of the large-diameter end of the bearing seat 1, ensuring that the circular runout is not more than 0.02mm, then feeding a milling cutter with the diameter of 4mm from top to bottom along the axial direction perpendicular to the end surface of a part, wherein the rotation speed of the milling cutter is 1269r/min, and the feeding amount is 100mm/min; specifically, because the double-layer bearing anti-rotation groove 2 is positioned on the arc-shaped surface of the phi 203mm inner hole, the circumferential distribution of materials is uneven, so that the cutter is in a lateral stress state, and a small-diameter milling cutter is adopted;
step two: finish milling bottom layer bearing groove
Feeding a milling cutter with the diameter of 4mm in a mode of retracting every time the milling cutter feeds 3mm, wherein the rotation speed of the milling cutter is 700r/min, and the feeding amount is 80mm/min; specifically, because the chip containing space is small, the chips are difficult to remove, and meanwhile, the cutting fluid cannot reach the whole part of the milling cutter, if the cutting heat cannot be discharged in time, the heat can be accumulated to influence the service life of the cutter, so that an intermittent feeding mode is adopted;
step three: roughly milling upper bearing groove
Milling the interference preventing grooves layer by using a milling cutter with the diameter of 3mm, reserving a margin of 0.1mm for finish milling, wherein the rotation speed of the milling cutter is 1000r/min, and the feeding amount is 40mm/min; specifically, the depth of the interference preventing groove is 1mm, the width is 1.5mm, the fillet is R1.5mm, and the problem of large vibration of a cutter exists during processing, so a layer-by-layer milling feeding mode is adopted;
step four: finish milling upper bearing groove
Adopting a phi 3mm end mill with a 28-35-degree helical angle to perform contour milling along the axial direction perpendicular to the axis of the part, and removing 0.1mm of allowance, wherein the rotation speed of the mill is 1300r/min, and the feed rate is 60mm/min; specifically, before profile milling, numerical control program compiling and simulation are required to be carried out on a complex profile in simulation software, so that the interference phenomenon between a part and a cutter is avoided, a cutting route and cutting parameters are optimized, and the influence of cutter vibration on the part is reduced; in the process of profile milling, cutting fluid needs to be fully poured, and the temperature rise is reduced, so that the thermal deformation is inhibited; the end mill with the helix angle of 28-35 degrees is adopted, and the aim is to ensure that cutter teeth are not weakened when the cutter is used for cutting for a long time, so that thermal wear caused by friction between the cutter and parts is reduced, and the reduction of cutting force is avoided; the machining efficiency can be improved and the surface quality of parts can be improved by adopting larger rotating speed and feeding.
The embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications without departing from the scope of the present invention are intended to be included in the scope of the present invention.
Claims (1)
1. A machining method for an anti-rotation groove of a high-temperature alloy double-layer bearing is characterized by comprising the following steps:
the method comprises the following steps: roughly milling bottom layer bearing groove
Firstly, positioning and pressing the process edge of the small-diameter end of the bearing seat by using a tool, aligning the excircle and the end surface of the large-diameter end of the bearing seat, ensuring that the circle run-out is not more than 0.02mm, then feeding from top to bottom in the axial direction by adopting a milling cutter with the diameter of 4mm, wherein the rotation speed of the milling cutter is 1269r/min, and the feeding amount is 100mm/min;
step two: finish milling bottom layer bearing groove
Feeding a milling cutter with the diameter of 4mm in a mode of retracting every time the milling cutter feeds 3mm, wherein the rotation speed of the milling cutter is 700r/min, and the feeding amount is 80mm/min;
step three: roughly milling upper bearing groove
Milling the interference preventing grooves layer by using a milling cutter with the diameter of 3mm, reserving a margin of 0.1mm for finish milling, wherein the rotation speed of the milling cutter is 1000r/min, and the feeding amount is 40mm/min;
step four: finish milling upper bearing groove
And (3) carrying out profile milling along the axial direction by adopting a phi 3mm spiral angle end mill with a 28-35 degree spiral angle, which is vertical to the axis of the part, so as to remove 0.1mm of allowance, wherein the rotation speed of the end mill is 1300r/min, and the feed amount is 60mm/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211410723.XA CN115592176A (en) | 2022-11-11 | 2022-11-11 | Machining method for high-temperature alloy double-layer bearing anti-rotation groove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211410723.XA CN115592176A (en) | 2022-11-11 | 2022-11-11 | Machining method for high-temperature alloy double-layer bearing anti-rotation groove |
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| Publication Number | Publication Date |
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| CN115592176A true CN115592176A (en) | 2023-01-13 |
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| CN202211410723.XA Pending CN115592176A (en) | 2022-11-11 | 2022-11-11 | Machining method for high-temperature alloy double-layer bearing anti-rotation groove |
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| CN (1) | CN115592176A (en) |
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- 2022-11-11 CN CN202211410723.XA patent/CN115592176A/en active Pending
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