CN113878299B - Method for repairing and processing bearing pedestal bushing - Google Patents
Method for repairing and processing bearing pedestal bushing Download PDFInfo
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- CN113878299B CN113878299B CN202111055448.XA CN202111055448A CN113878299B CN 113878299 B CN113878299 B CN 113878299B CN 202111055448 A CN202111055448 A CN 202111055448A CN 113878299 B CN113878299 B CN 113878299B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
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Abstract
The invention discloses a method for repairing and processing a bearing seat bush, which comprises the steps of incompletely fixing a casing after a clamp is arranged on a grinding machine, and then respectively positioning the casingThen, the position of the machine box is adjusted on the machine tool so that the F reference center and the B reference center are respectively eccentric towards the inside in the x direction and the y direction by delta x/2 and delta y/2, a connecting line of the eccentric F reference center and the B reference center is used as a B-F common reference axis, and the intersection point of the B-F common reference axis and the machine tool spindle axis is found as a center point to carry out hole drilling
Machining of, this time, the hole
Are located at minimum distances Δ 1 and Δ 2 from the common reference axis of B-F, thereby ensuring that the holes are all in alignment with each other
The machining meets the technical requirement of r | phi 0.015 and no component B-F, thereby solving the problem of difficult repair of the bearing seat bush.
Description
Technical Field
The invention relates to the technical field of aero-engines, in particular to a method for repairing and processing a bearing seat bushing.
Background
As shown in figure 1, when a certain casing of an aircraft engine is normally overhauled, a middle bearing seat lining needs to be replaced, and a hole is found in the machining process
The technical requirement of gamma phi 0.015 and no magnetism B-F is difficult to guarantee, because the B reference and the F reference are deformed in the use process of the casing, the roundness difference even reaches 0.05, and the axes of the B reference and the F reference are not on the same axis any more. Therefore, if the hole is made after the positioning based on the B reference and the F reference that have been deformed
Machining of holes
The technical requirement that R | phi 0.015 air ventilation B-F cannot be met, so that the repair difficulty of the bearing seat bushing in the casing is high.
Disclosure of Invention
The invention provides a method for repairing and processing a bearing seat bushing, which aims to solve the technical problem that the repair difficulty is high due to the deformation of a B datum and an F datum in the repair process of the bearing seat bushing at present.
According to one aspect of the invention, a method for repairing and processing a bearing seat bushing is provided, which comprises the following steps:
taking down a bearing seat bushing needing to be repaired from the casing;
mounting a new bearing block bushing to the casing;
installing a clamp on a grinding machine, then clamping a casing, incompletely fixing the casing by a pressing plate, positioning centers of an F reference and a B reference, calculating to obtain deviation values delta x and delta y of the center of the F reference and the center of the B reference in the x direction and the y direction respectively, adjusting the position of the casing to enable the center of the F reference and the center of the B reference to be inwards eccentric delta x/2 and delta y/2 in the x direction and the y direction respectively, completely fixing the casing by using the pressing plate, taking the connecting line of the eccentric center of the F reference and the center of the B reference as a common B-F reference axis, and finding out the intersection point of the common B-F reference axis and the axis of a machine tool spindle as a central point to carry out hole drilling
And (4) processing.
Further, the process of locating the centers of the F reference and the B reference specifically includes the following:
and (4) aligning the symmetrical four points on the F datum and the symmetrical four points on the B datum, and respectively taking the centers of the symmetrical four points as the center of the F datum and the center of the B datum.
Further, the process of removing the bearing seat bush needing to be repaired from the casing specifically includes the following steps:
respectively processing Kong 3.2.3.2 +/-0.1 on two positioning pins limited by the bushing;
tapping M4 x 0.7 on Kong 3.2.3.2 +/-0.1 at two positions, and taking out the positioning pin by using a puller;
and (4) putting the casing into an electric furnace for heating, taking out the casing after heating is finished, and taking down the bearing seat bushing.
Further, the process of installing the new bearing housing bush on the casing specifically includes the following:
reaming phi 6.69 (+ 0.17,0) at the position of the original positioning pin, and tapping M8 x 1.25 to form a threaded hole;
combining the retaining pin into the threaded hole M8 x 1.25;
processing a bottom hole for installing a bearing seat bushing, and recording the diameter value phi T1 of the processed bottom hole;
carrying out local oxidation treatment on a bottom hole of the bearing seat bushing;
selecting a new bearing seat bushing according to the diameter value phi T1 of the bottom hole and the matching requirement;
heating the casing, cooling the new bearing seat bushing, and combining the cooled bearing seat bushing into the bottom hole of the heated casing;
and processing two positioning pin holes limited by the bushing on the stop pin, and combining the positioning pins.
Further, the heating temperature of the casing is 120-150 ℃, and the new bearing seat bushing is cooled by liquid nitrogen for 8-10 minutes.
Further, the temperature of the casing put into an electric furnace for heating is 150 ℃, and the heating time is 60 minutes.
Furthermore, after the clamp is installed on a grinding machine, the jump of the support surface of the clamp needs to be aligned to be not more than 0.005, and the jump of the positioning inner hole of the clamp is not more than 0.015.
Further, in the process of
The following are also included after processing:
and removing all burrs at the bearing seat bushing.
The invention has the following effects:
the invention relates to a method for repairing and processing a bearing seat bushing, which comprises the steps of incompletely fixing a casing after a clamp is arranged on a grinding machine, then respectively positioning a B reference center and an F reference center on the casing, calculating to obtain deviation values delta x and delta y of the F reference center and the B reference center in the x direction and the y direction, adjusting the position of the casing on the machine tool to enable the F reference center and the B reference center to be inwards eccentric delta x/2 and delta y/2 in the x direction and the y direction respectively, taking a connecting line of the F reference center and the B reference center after the eccentricity as a B-F common reference axis, and finding out an intersection point of the B-F common reference axis and a machine tool spindle axis as a central point to carry out hole drilling
Machining of, this time, the hole
Are located at minimum distances Δ 1 and Δ 2 from the common reference axis of B-F, thereby ensuring that the holes are all in alignment with each other
The machining meets the technical requirement of r | phi 0.015 and no component B-F, thereby solving the problem of difficult repair of the bearing seat bush.
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 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 repair process of an intermediate bearing housing bush of a certain casing.
Fig. 2 is a schematic flow chart of a repair processing method of a bearing housing bush according to a preferred embodiment of the present invention.
FIG. 3 is a schematic diagram of resolving the technical requirement of r | Φ 0.015 not B-F in the preferred embodiment of the present invention.
FIG. 4 is a schematic diagram of the coordinate borrowing from the B and F references in the preferred embodiment of the present invention.
Fig. 5 is a sub-flowchart of step S1 in fig. 2.
Fig. 6 is a sub-flowchart of step S2 in fig. 2.
Fig. 7 is a schematic view of part clamping in step S3 in fig. 2.
Fig. 8 is a schematic diagram of establishing a machining coordinate system by coordinates based on an F reference coordinate system and a B reference coordinate system in the present invention.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.
As shown in fig. 2, a preferred embodiment of the present invention provides a method for repairing a bearing housing bush, which includes the following steps:
step S1: taking down a bearing seat bushing needing to be repaired from the casing;
step S2: mounting a new bearing block bushing to the casing;
and step S3: installing a clamp on a grinding machine, then clamping a casing, incompletely fixing the casing by a pressing plate, positioning centers of an F datum and a B datum, calculating to obtain deviation values delta x and delta y of the center of the F datum and the center of the B datum in the x direction and the y direction respectively, adjusting the position of the casing to enable the center of the F datum and the center of the B datum to be eccentric inwards in the x direction and the y direction relative to the center of a main shaft by delta x/2 and delta y/2 respectively, completely fixing the casing by using the pressing plate, taking a connecting line of the eccentric center of the F datum and the center of the B datum as a common B-F datum axis, and finding out an intersection point of the common B-F datum axis and the axis of the main shaft of the machine tool as a central point to carry out hole drilling
The machining of (2).
It will be appreciated that the holes are based as shown in figure 3
The definition of No. B-F in the technical requirement r | phi 0.015, the requirement of the hole
Must lie in a cylinder of diameter tolerance value Φ 0.015 and coaxial with common reference line B-F, i.e. both Δ 1 and Δ 2 in FIG. 3 are ≦ 0.015. Therefore, in order to minimize both Δ 1 and Δ 2, the machine casing needs to establish machining holes in the B reference and the F reference by coordinates when being clamped and found
The coordinate system of (2). As shown in fig. 1, the inventor has found through research that the bearing seat bush requiring rework is approximately located at the midpoint of the B reference and the F reference, and as shown in fig. 4, when borrowing coordinates from the B reference and the F reference, when Δ B = Δ F, the B-F common reference axis and the hole are
Will fall substantially within the bore
At a midpoint position of the axis of (a), where both Δ 1 and Δ 2 are minimal. Therefore, in the present invention, after the jig is mounted on the grinding machine, the pressing plate does not completely fix the casing, and then the B reference center and the F reference center on the casing are respectively positioned. Then, deviation values Δ x and Δ y of the F reference center and the B reference center in the x direction and the y direction, respectively, are calculated because of the holes
Approximately at the midpoint of the F reference and the B reference, the position of the casing is adjusted on the machine tool so that the center of the F reference and the center of the B reference are inwardly eccentric by Deltax/2 and Deltax/2 in the x and y directions, respectively, and thenCompletely fixing the casing by using a pressure plate, taking the connecting line of the eccentric F reference center and B reference center as a B-F common reference axis, and finding out the intersection point of the B-F common reference axis and the machine tool spindle axis as a central point to perform hole drilling
Machining of, this time, the hole
Are located at minimum distances Δ 1 and Δ 2 from the common reference axis of B-F, thereby ensuring that the holes are in a position to receive the fluid
The processing of (1) meets the technical requirement of r | phi 0.015 and no magnetism B-F.
It can be understood that, in the method for repairing and processing the bearing seat bushing of the embodiment, after the fixture is mounted on the grinding machine, the casing is not completely fixed, then the B reference center and the F reference center on the casing are respectively positioned, the deviation values Δ x and Δ y of the F reference center and the B reference center in the x direction and the y direction are obtained through calculation, then the position of the casing is adjusted on the machine tool, so that the F reference center and the B reference center are respectively deviated inwards in the x direction and the y direction by Δ x/2 and Δ y/2, the connecting line of the F reference center and the B reference center after being deviated is used as the B-F common reference axis, and the intersection point of the B-F common reference axis and the machine tool spindle axis is found as the central point to perform hole drilling
Machining of the hole, at this time
Are located at minimum distances Δ 1 and Δ 2 from the common reference axis of B-F, thereby ensuring that the holes are all in alignment with each other
The machining meets the technical requirement of r | phi 0.015 and no component B-F, thereby solving the problem of difficult repair of the bearing seat bush.
It can be understood that, as shown in fig. 5, the step S1 specifically includes the following steps:
step S11: kong 3.2.2 +/-0.1 is respectively processed on two positioning pins limited by the bushing;
step S12: tapping M4 x 0.7 on Kong 3.2.3.2 +/-0.1 at two positions, and taking out the positioning pin by using a puller;
step S13: and (4) putting the casing into an electric furnace for heating, taking out the casing after heating is finished, and taking down the bearing seat bushing.
It can be understood that in the process of removing the bearing seat bushing needing to be repaired, firstly, the electric sparks are used for machining Kong 3.2.3.2 +/-0.1 on two locating pins limited by the bushing, then the two locating pins are tapped by a bench worker to machine a threaded hole M4 x 0.7, and then the locating pin is taken out by a puller. At this time, the bush is released from the fixed state, but since the bush is in interference fit with the bottom hole of the casing, the bush cannot be removed from the casing at this time. And then the casing is put into an electric furnace for heating, and after the heating is finished, the casing is taken out from the electric furnace, and the bearing seat bushing can be easily taken out because the thermal expansion amplitude of the casing is larger than that of the bushing in the heating process. In addition, the temperature of the casing which is put into the electric furnace for heating is 150 ℃, the heating time is 60 minutes, and when the temperature and the heating time are within the range, the thermal expansion difference between the casing and the lining is large, so that the lining is convenient to take out.
It can be understood that, as shown in fig. 6, the step S2 specifically includes the following steps:
step S21: reaming phi 6.69 (+ 0.17,0) at the position of the original positioning pin, and tapping M8 x 1.25 to form a threaded hole;
step S22: combining the retaining pin into the threaded hole M8 x 1.25;
step S23: processing a bottom hole for installing a bearing seat bushing, and recording the diameter value phi T1 of the processed bottom hole;
step S24: carrying out local oxidation treatment on a bottom hole of the bearing seat bushing;
step S25: selecting a new bearing seat bushing according to the diameter value phi T1 of the bottom hole and the matching requirement;
step S26: heating the casing, cooling the new bearing seat bushing, and combining the cooled bearing seat bushing into the bottom hole of the heated casing;
step S27: and processing two positioning pin holes limited by the bushing on the stop pin, and combining the positioning pins.
It will be appreciated that after removing the liner from the original casing, the bore is enlarged by the driller at the location of the original locating pin to a diameter of Φ 6.69 (+ 0.17,0), then tapped M8 x 1.25 to form a threaded bore, and the retaining pin is installed into the threaded bore M8 x 1.25. Then, a bottom hole for installing the bearing seat bushing is machined in the casing, the diameter value phi T1 of the bottom hole is recorded, local oxidation treatment is carried out on the bottom hole, and then a new bearing seat bushing is selected according to the actual diameter value phi T1 of the bottom hole and the matching requirement. And heating the casing, cooling the new bearing seat bushing, then loading the cooled bearing seat bushing into the bottom hole of the heated casing, and performing combined installation in a mode of expansion with heat and contraction with cold. And finally, processing two positioning pin holes for limiting the bushing on the stop pin, and installing the positioning pin to position the bushing. In the invention, considering that the positioning accuracy of the positioning pin hole is poor after the original bushing is taken off from the casing, the positioning accuracy of the positioning pin is ensured by reaming the position of the original positioning pin to install the positioning pin and then re-processing a new positioning pin hole on the positioning pin. In addition, the heating temperature of the casing is preferably 120-150 ℃, and the new bearing seat bushing is cooled by liquid nitrogen for 8-10 minutes.
It can be understood that in the step S3, after the fixture is mounted on the grinding machine, the fixture seating surface jump needs to be aligned to be not more than 0.005, and the fixture positioning inner hole jump is not more than 0.015, so as to ensure the positioning accuracy of the fixture itself. Then, the parts of the casing are clamped according to the mode of fig. 7, and the pressing plate is not fixed completely when the parts are clamped, so that the position of the casing can be adjusted at any time. Then, respectively positioning the centers of the F datum and the B datum, specifically:
and (4) aligning the symmetrical four points on the F datum and the symmetrical four points on the B datum, and respectively taking the centers of the symmetrical four points as the center of the F datum and the center of the B datum.
It can be understood that when the datum to be aligned rotates along with the main shaft, the quartering points of the datum are allowed, and when the zero pair of the meter is printed, the center of the datum is considered to be aligned, namely, the symmetric four points are aligned. Because the F datum and the B datum are deformed, the former datum central point can not be used any more, the invention can accurately position the center of the F datum and the center of the B datum by the alignment method for aligning the symmetrical four points on the F datum and the B datum, and effectively avoids the influence caused by the deformation of the B datum and the F datum.
Then, the deviation Δ x in the x direction and the deviation Δ y in the y direction of the F reference center and the B reference center can be calculated. Because of, the holes
Approximately at the midpoint of the F and B references, and only if Δ B = Δ F, the hole
The distance value from the axis of the B-F reference to the common reference axis is the minimum, so that two symmetrical two points of the F reference need to be respectively corrected to one side by coordinate eccentricity delta/2,B and two corresponding symmetrical two points of the F reference need to be corrected to the other side by coordinate eccentricity delta/2. As shown in fig. 8, when a new workpiece is processed, the F, B is processed in the same process, and the two references can be considered concentric, so that the processing coordinate system only needs to be established at the two circle centers. But the part deforms after being used, and the two references are not concentric, so that a coordinate system is established at the two references respectively during processing, then a processing coordinate system is established towards the middle eccentricity, wherein the F, B reference is respectively calculated to be delta/2 from the previous number,
it can be understood that the repair processing method of the bearing seat bushing further comprises the following steps:
and step S4: and removing all burrs at the bearing seat bushing.
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 (8)
1. A method for repairing and processing a bearing seat bushing is characterized by comprising the following steps:
taking down a bearing seat bushing needing to be repaired from a casing;
mounting a new bearing block bushing to the casing;
installing a clamp on a grinding machine, then clamping a casing, incompletely fixing the casing by a pressing plate, positioning centers of an F reference and a B reference, calculating to obtain deviation values delta x and delta y of the center of the F reference and the center of the B reference in the x direction and the y direction respectively, adjusting the position of the casing to enable the center of the F reference and the center of the B reference to be inwards eccentric delta x/2 and delta y/2 in the x direction and the y direction respectively, completely fixing the casing by using the pressing plate, taking the connecting line of the eccentric center of the F reference and the center of the B reference as a common B-F reference axis, and finding out the intersection point of the common B-F reference axis and the axis of a machine tool spindle as a central point to carry out hole drilling
And (4) processing.
2. A method of reworking a bearing housing bush according to claim 1, wherein the process of locating the centers of the F reference and the B reference specifically comprises the following:
and (4) aligning the symmetrical four points on the F datum and the symmetrical four points on the B datum, and respectively taking the centers of the symmetrical four points as the center of the F datum and the center of the B datum.
3. The method for repairing a bearing housing bush according to claim 1, wherein the process of removing the bearing housing bush to be repaired from the casing specifically includes the following steps:
respectively processing Kong 3.2.3.2 +/-0.1 on two positioning pins for bushing limiting;
tapping M4 multiplied by 0.7 on Kong 3.2.3.2 +/-0.1 at two positions, and taking out the positioning pin by using a puller;
and (4) putting the casing into an electric furnace for heating, taking out the casing after heating is finished, and taking down the bearing seat bushing.
4. A method of reworking a bearing housing liner according to claim 3, wherein said process of installing a new bearing housing liner to the casing specifically comprises the following:
reaming at the original location of the dowel
Tapping M8 multiplied by 1.25 to form a threaded hole;
combining the stop pin into the threaded hole M8 multiplied by 1.25;
processing a bottom hole for installing a bearing seat bushing, and recording the diameter value phi T1 of the processed bottom hole;
carrying out local oxidation treatment on a bottom hole of the bearing seat bushing;
selecting a new bearing seat bushing according to the diameter value phi T1 of the bottom hole and the matching requirement;
heating the casing, cooling the new bearing seat lining, and combining the cooled bearing seat lining into the bottom hole of the heated casing;
and processing two positioning pin holes for limiting the bushing on the stop pin, and combining the positioning pins.
5. A method of reworking a bearing housing liner according to claim 4, wherein the casing is heated to a temperature of 120 ℃ to 150 ℃ and the new bearing housing liner is cooled with liquid nitrogen for 8 to 10 minutes.
6. A method of reworking a bearing housing liner according to claim 3, wherein said casing is placed in an electric furnace and heated at a temperature of 150 ℃ for a time of 60 minutes.
7. A method of reworking a bearing housing bushing according to claim 1, wherein after the jig is mounted on the grinding machine, it is necessary to align the run-out of the abutment surface of the jig to not more than 0.005 and the run-out of the positioning bore of the jig to not more than 0.015.
8. A method of reworking a bearing housing bushing according to claim 1, wherein said step of reworking is carried out
The following are also included after processing:
and removing all burrs at the bearing seat bushing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111055448.XA CN113878299B (en) | 2021-09-09 | 2021-09-09 | Method for repairing and processing bearing pedestal bushing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111055448.XA CN113878299B (en) | 2021-09-09 | 2021-09-09 | Method for repairing and processing bearing pedestal bushing |
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| Publication Number | Publication Date |
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| CN113878299A CN113878299A (en) | 2022-01-04 |
| CN113878299B true CN113878299B (en) | 2022-10-18 |
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| CN202111055448.XA Active CN113878299B (en) | 2021-09-09 | 2021-09-09 | Method for repairing and processing bearing pedestal bushing |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016159304A (en) * | 2015-02-26 | 2016-09-05 | Ｊｆｅスチール株式会社 | Method for repairing roll chock for rolling mill and mill |
| CN106838019A (en) * | 2017-01-23 | 2017-06-13 | 赵艳蕊 | Water supply pumping plant bearing block and renovation technique |
| CN107747090A (en) * | 2017-10-23 | 2018-03-02 | 谷云蕾 | A kind of method of laser remanufacturing rolling mill bearing |
| WO2021078342A1 (en) * | 2019-10-23 | 2021-04-29 | Vestas Wind Systems A/S | Method of repairing a bearing bore and bore insert for repairing a bearing bore |
-
2021
- 2021-09-09 CN CN202111055448.XA patent/CN113878299B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016159304A (en) * | 2015-02-26 | 2016-09-05 | Ｊｆｅスチール株式会社 | Method for repairing roll chock for rolling mill and mill |
| CN106838019A (en) * | 2017-01-23 | 2017-06-13 | 赵艳蕊 | Water supply pumping plant bearing block and renovation technique |
| CN107747090A (en) * | 2017-10-23 | 2018-03-02 | 谷云蕾 | A kind of method of laser remanufacturing rolling mill bearing |
| WO2021078342A1 (en) * | 2019-10-23 | 2021-04-29 | Vestas Wind Systems A/S | Method of repairing a bearing bore and bore insert for repairing a bearing bore |
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| Publication number | Publication date |
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| CN113878299A (en) | 2022-01-04 |
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