Process for machining rear bearing seat with spatial oil injection holes

Abstract

The application discloses a machining process of a rear bearing seat with a space oil injection hole, and specifically comprises the following steps: S1, rough machining is first performed on a rear bearing seat blank, then the rear bearing seat blank is clamped by taking the end face of the intermediate mounting edge and the outer circle as the axial reference surface and the radial reference circle, and then oil channel windows and end face oil holes are machined on the rear bearing seat blank to open the oil holes on the large end face; S2, a cover plate is welded at the oil channel windows, and a plug is welded at the oil hole of the small end face; S3, the end face, the inner hole and the outer circle of the rear bearing seat blank are subjected to finish machining, and the intermediate mounting edge is subjected to semi-finish machining; S4, a space oil injection hole is electrically machined by using a machining electrode, and cooling liquid is continuously injected into the internal oil channel of the rear bearing seat blank; S5, the outer side opening of the space oil injection hole is subjected to plugging welding; S6, the intermediate mounting edge is subjected to finish machining, and the rear bearing seat with the space oil injection hole is obtained; and S7, flow and flow direction tests are performed on the rear bearing seat.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil hole processing, in particular, to a processing technology of a rear bearing seat with a space oil injection hole. BACKGROUND

[0002] With the continuous improvement of the performance of the aero-engine, and the complex structure of the internal parts, the high degree of functional integration, especially the rear bearing seat, the cavity size is small, but the internal oil circuit is complex, and multiple oil injection holes (size Φ0.5-Φ1.2mm) are provided to quantitatively and directionally spray oil to other parts to lubricate and cool. Therefore, the processing quality of the oil injection hole on the rear bearing seat will directly affect the oil flow and the oil flow direction of the rear bearing seat.

[0003] At present, the oil injection hole is processed synchronously in the bearing seat processing process, and the oil injection hole on the bearing seat is realized by electro-processing. The processing electrode is usually processed from the inside of the part cavity to penetrate to the oil circuit, and the oil is sprayed from the oil injection hole through the oil circuit, but the space oil injection hole on the rear bearing seat is located in the middle of the part, and the processing electrode cannot be processed from the inside of the part cavity. Only the oil injection hole can be processed from the cavity outside to the oil circuit, and then processed to the inside of the part cavity, and then the cavity outside section of the oil injection hole is sealed, so after the electro-processing of the oil injection hole, the outside of the oil injection hole is sealed by welding process. Affected by the welding process, the rear bearing seat deforms during processing, so that the precision size and shape tolerance cannot meet the design requirements. Secondly, since the processing electrode is processed from the outside of the cavity, the cooling liquid cannot pass through the inside of the cavity to the processing site, the processing electrode has abnormal discharge, and the phenomenon of arc drawing occurs, which causes carbon deposition and burn on the processing site, and the hole diameter value is seriously out of tolerance. At the same time, after the electro-processing of the oil injection hole, the outside of the cavity is welded with a plug, and then the flow and flow direction test is carried out, so the space oil injection hole cannot be repaired to ensure the qualified flow and flow direction, so the space oil injection hole is unqualified. SUMMARY

[0004] The present application provides a processing technology of a rear bearing seat with a space oil injection hole to solve the technical problems of deformation in the existing rear bearing seat processing process and unqualified space oil injection hole processing.

[0005] According to one aspect of the present application, a machining process for a rear bearing seat with a space oil injection hole is provided, which specifically comprises the following steps: S1, rough machining is first performed on a rear bearing seat blank, then the rear bearing seat blank is clamped by taking the end face of the intermediate mounting edge and the outer circle as the axial reference surface and the radial reference circle, and the large end face of the rear bearing seat blank is upward, then the oil channel window and the end face oil hole are machined on the rear bearing seat blank to open the oil hole on the large end face of the rear bearing seat blank; S2, a cover plate is welded at the oil channel window, and a plug is welded at the oil hole of the small end face of the rear bearing seat blank; S3, the end face, inner hole and outer circle of the rear bearing seat blank are finished, and the intermediate mounting edge is semi-finished to remove the welding deformation; S4, a machining electrode is used to electrically machine a space oil injection hole through the internal oil channel to communicate to the inner cavity of the rear bearing seat blank from the outside of the rear bearing seat blank, and in the process of electric machining, cooling liquid is continuously injected into the internal oil channel of the rear bearing seat blank through the oil hole on the large end face of the rear bearing seat blank; S5, the outside opening of the space oil injection hole is plugged and welded, wherein the outside opening of the space oil injection hole is close to the intermediate mounting edge; S6, the intermediate mounting edge is finished to remove the welding deformation and ensure that the axial reference surface and the radial reference circle are qualified in size, so as to obtain a rear bearing seat with a space oil injection hole; S7, flow and flow direction test is performed on the rear bearing seat to check whether it is qualified.

[0006] As a further improvement of the above technical solution:

[0007] Further, in step S4, the diameter of the machining electrode is 0.5 mm, and the hole diameter value of the space oil injection hole is Φ0.57 mm-Φ0.59 mm.

[0008] Further, in step S4, the machining depth of the electric machining is 30 mm.

[0009] Further, in step S4, the cooling liquid is deionized water.

[0010] Further, between step S3 and step S4, there is also a step of finishing the side face boss of the rear bearing seat blank, the outside machining part of the space oil injection hole on the rear bearing seat blank, and the mounting hole on the intermediate mounting edge.

[0011] Further, between step S6 and step S7, there is also a step of electrically machining a side oil injection hole communicating to the internal oil channel from the inner cavity of the rear bearing seat by using a machining electrode.

[0012] Further, between step S2 and step S3, there is also a step of heat treating the rear bearing seat blank.

[0013] Further, the rough machining on the rear bearing seat blank includes the following steps: rough machining is first performed on the large end face, the small end face, the intermediate mounting edge, the inner hole and the outer circle of the rear bearing seat blank.

[0014] Further, in step S4, the intermediate mounting edge is left with a machining allowance of 0.1mm after semi-finishing.

[0015] Further, the rear bearing seat comprises a plurality of space oil injection holes arranged along the circumference of the rear bearing seat.

[0016] The present application has the following advantages:

[0017] The machining process of the rear bearing seat with space oil injection holes comprises the following steps: firstly, rough machining the rear bearing seat blank; secondly, clamping the rear bearing seat blank by taking the end face and the outer circle of the intermediate mounting edge as the axial reference surface and the radial reference circle, and making the large end face of the rear bearing seat blank face upwards; thirdly, machining the oil channel window and the end face oil hole on the rear bearing seat blank, so as to open the oil hole of the large end face of the rear bearing seat blank, thereby providing an entrance for the injection of cooling liquid; fourthly, welding a cover plate at the oil channel window and a plug at the oil hole of the small end face of the rear bearing seat blank, so as to ensure the qualification of the internal oil channel; fifthly, finishing the end face, the inner hole and the outer circle of the rear bearing seat blank, and semi-finishing the intermediate mounting edge, so as to remove the welding deformation and ensure the machining precision in the subsequent electro-machining; sixthly, machining the space oil injection hole through the internal oil channel to connect to the inner cavity of the rear bearing seat blank by using a machining electrode from the outside of the rear bearing seat blank, and continuously injecting cooling liquid into the internal oil channel of the rear bearing seat blank through the oil hole on the large end face of the rear bearing seat blank in the process of electro-machining, so as to ensure a good electro-machining environment, avoid carbon deposition and burning of the machining part, and realize cooling and chip removal; seventhly, plugging and welding the outside opening of the space oil injection hole, since the outside opening of the space oil injection hole is close to the intermediate mounting edge, the reference on the intermediate mounting edge will be affected, therefore, the intermediate mounting edge is finished to remove the welding deformation and ensure the qualification of the axial reference surface and the radial reference circle, thereby obtaining the rear bearing seat with space oil injection holes; eighthly, performing flow and flow direction test on the rear bearing seat to check whether it is qualified; and ninthly, optimizing and improving the clamping mode, so that the large end face of the rear bearing seat blank faces upwards and the oil hole of the large end face of the rear bearing seat blank is opened, thereby injecting cooling liquid through the oil hole of the large end face of the rear bearing seat blank in the process of electro-machining to avoid carbon deposition and burning of the machining part, so that the space oil injection hole is qualified; and tenthly, optimizing the process route, so that after the space oil injection hole is machined, the intermediate mounting edge is finished to eliminate the reference deformation caused by plugging and welding the outside opening of the space oil injection hole, thereby greatly improving the machining qualification rate of the rear bearing seat with space oil injection holes, and the present application has strong practicability and is suitable for wide promotion and application.

[0018] In addition to the objects, features, and advantages described above, the present application has other objects, features, and advantages. The present application will be further described in detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 This is a flowchart of the steps of a process for manufacturing a rear bearing seat with a spatial oil injection hole according to a preferred embodiment of the present invention;

[0021] Figure 2 It is a cross-sectional schematic diagram of a rear bearing seat blank in the processing of a rear bearing seat with a spatial oil injection hole in a preferred embodiment of the present invention;

[0022] Figure 3 It is a cross-sectional schematic diagram of the rear bearing seat in the processing process of the rear bearing seat with spatial oil injection holes in the preferred embodiment of the present invention. DETAILED DESCRIPTION

[0023] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0024] like Figure 1-Figure 3 As shown, the processing technology of the rear bearing seat with a spatial oil injection hole in this embodiment specifically includes the following steps: S1, first rough-processing the rear bearing seat blank, and then clamping the rear bearing seat blank with the end face and outer circle of the middle mounting edge as the axial reference surface and radial reference circle, and making the large end face of the rear bearing seat blank face upward, and then processing the oil path window and the end face oil hole on the rear bearing seat blank to open the oil hole on the large end face of the rear bearing seat blank; S2, welding a cover plate at the oil path window, and welding a plug at the oil hole on the small end face of the rear bearing seat blank; S3, fine-processing the end face, inner hole and outer circle of the rear bearing seat blank, and semi-fine-processing the middle mounting edge to remove welding deformation. amount; S4, use a machining electrode to electro-machine a spatial oil spray hole from the outside of the rear bearing seat blank through the internal oil circuit to connect to the inner cavity of the rear bearing seat blank. At the same time, during the electro-machining process, continuously inject coolant into the internal oil circuit of the rear bearing seat blank through the oil hole on the large end face of the rear bearing seat blank; S5, seal the outer opening of the spatial oil spray hole by welding, wherein the outer opening of the spatial oil spray hole is close to the middle mounting edge; S6, fine-machine the middle mounting edge to remove the welding deformation and ensure that the dimensions of the axial reference plane and the radial reference circle are qualified, thereby obtaining a rear bearing seat with a spatial oil spray hole; S7, perform flow and flow direction tests on the rear bearing seat to check whether it is qualified. It should be understood that electro-machining refers to electric spark machining. It should be understood that the axis of the spatial oil spray hole does not pass through the center line of the rear bearing seat.

[0025] like Figure 1-Figure 3As shown, specifically, the machining process of the rear bearing seat with the space oil injection hole of the application first coarsely machines the rear bearing seat blank, then clamps the rear bearing seat blank with the end face and the outer circle of the intermediate mounting edge as the axial reference surface and the radial reference circle, and makes the large end face of the rear bearing seat blank face upward, then machines the oil channel window and the end face oil hole on the rear bearing seat blank to open the oil hole of the large end face of the rear bearing seat blank, thereby providing an entrance for the injection of the cooling liquid, welds the cover plate at the oil channel window, and welds the plug at the oil hole of the small end face of the rear bearing seat blank to ensure the qualification of the internal oil channel, finely machines the end face, the inner hole and the outer circle of the rear bearing seat blank, and semi-finish machines the intermediate mounting edge to remove the welding deformation amount and ensure the machining precision in the subsequent electro-machining, adopts the machining electrode to electro-machine the space oil injection hole that passes through the internal oil channel to communicate to the inner cavity of the rear bearing seat blank from the outside of the rear bearing seat blank, at the same time, continuously injects the cooling liquid into the internal oil channel of the rear bearing seat blank through the oil hole on the large end face of the rear bearing seat blank in the process of electro-machining to ensure a good electro-machining environment, avoid carbon deposition and burning of the machining part, realize cooling and chip removal, and seal and weld the outside opening of the space oil injection hole, since the outside opening of the space oil injection hole is close to the intermediate mounting edge, the reference on the intermediate mounting edge will be affected, the intermediate mounting edge is finely machined to remove the welding deformation amount and ensure the qualification of the size of the axial reference surface and the radial reference circle, thereby obtaining the rear bearing seat with the space oil injection hole, the rear bearing seat is subjected to the flow and flow direction test to check whether it is qualified, the clamping mode is optimized and improved in the scheme, the large end face of the rear bearing seat blank faces upward, and the oil hole of the large end face of the rear bearing seat blank is opened to inject the cooling liquid through the oil hole of the large end face of the rear bearing seat blank during the electro-machining to avoid carbon deposition and burning of the machining part, thereby making the space oil injection hole machining qualified, the process route is optimized, the intermediate mounting edge is finely machined after the space oil injection hole is machined to eliminate the reference deformation caused by the welding sealing of the outside opening of the space oil injection hole, thereby greatly improving the machining qualification rate of the rear bearing seat with the space oil injection hole, and the practicality is high, and the rear bearing seat with the space oil injection hole is suitable for wide promotion and application.

[0026] It should be understood that the conventional oil injection hole is finished on the part before electro-processing to ensure the machining accuracy of the oil injection hole, and the machining electrode enters the machining from the inner cavity of the bearing seat during electro-processing, and there is no welding process after electro-processing, and the part reference will not be deformed; while the space oil injection hole needs to weld the outer opening of the space oil injection hole after electro-processing, which causes the deformation of the part reference. Therefore, in the embodiment, the end face, inner hole and outer circle of the rear bearing seat blank are finished before electro-processing, but the middle mounting edge is semi-finished, so as to ensure the machining accuracy during electro-processing, and to eliminate the deformation of the rear bearing seat blank after welding the outer opening of the space oil injection hole, thereby improving the machining efficiency and ensuring the machining qualification rate.

[0027] It should be understood that in the embodiment, after the rough machining of the rear bearing seat blank, the end face and the outer circle of the middle mounting edge are used as the axial reference surface and the radial reference circle to clamp the rear bearing seat blank, so as to prepare for the deformation and repair of the part in the subsequent machining process. If the end face and the outer circle of the middle mounting edge are not used as the axial reference surface and the radial reference circle to clamp the rear bearing seat blank, the main deformation of the rear bearing seat blank will be concentrated on the middle mounting edge when the outer opening of the space oil injection hole is welded in the subsequent machining process, and the deformation of the rear bearing seat blank cannot be eliminated, resulting in unqualified machining of the rear bearing seat blank.

[0028] It should be understood that the conventional oil injection hole can be repaired to ensure the flow rate and flow direction to be qualified after the flow rate and flow direction test, and the diameter of the electro-processing electrode is about 0.04 smaller than the hole diameter value, but the space oil injection hole cannot be repaired to ensure the flow rate and flow direction to be qualified after the flow rate and flow direction test, so the space oil injection hole must be qualified in one machining, which is difficult to machine.

[0029] In the embodiment, in step S4, the diameter of the machining electrode is 0.5mm, and the hole diameter value of the space oil injection hole is Φ0.57mm-Φ0.59mm. It should be understood that the diameter of the machining electrode commonly used for machining Φ0.57mm-Φ0.59mm hole is 0.55mm, but because the hole of the space oil injection hole is too long, the electrode swings a lot during machining. If the machining electrode with a diameter of 0.55mm is still used for machining, the hole diameter will be machined to 0.67mm, which is unqualified. By adjusting the diameter of the machining electrode, the machining electrode with a diameter of 0.5mm is used for machining, which can ensure that the hole diameter value of the oil injection hole is stable at Φ0.57-Φ0.59mm, and the flow rate and flow direction test is qualified, thereby improving the machining efficiency.

[0030] In the embodiment, the machining depth of the electro-machining in step S4 is 30 mm. It should be understood that the machining electrode needs to keep the machining depth after machining the space oil injection hole, and then continuously expand the hole. It should be understood that the hole depth of the space oil injection hole is usually 18 mm, and by making the machining depth 30 mm, when the machining electrode penetrates the space oil injection hole in the electro-machining process and keeps the machining depth of 30 mm, that is, the machining part of the machining electrode has been worn into the inner cavity of the bearing seat blank, the machining part of the machining electrode for expanding the space oil injection hole is not worn, so as to achieve the purpose of expanding the hole. It should be understood that the conventional machining depth is usually 21 mm, that is, the machining depth is 3 mm longer than the hole depth, but the machining depth will cause the machining part of the machining electrode to be worn in the drilling process, so that the diameter of the machining electrode is too small to achieve the purpose of expanding the hole. Alternatively, in an embodiment, the diameter of the machining electrode is 0.5 mm, and the machining depth is 30 mm, so as to ensure that the oil injection hole diameter value is stable at Φ0.57-Φ0.59 mm, and the space oil injection hole can be machined once to ensure the flow and flow direction.

[0031] In the embodiment, the cooling liquid in step S4 is deionized water. Specifically, the deionized water has high purity, so that the deionized water will not cause additional pollution or corrosion to the part and the machining electrode in the electro-machining process, which is conducive to improving the machining precision and surface quality, and reducing the generation of electrostatic interference and electrochemical reaction, which helps to maintain the stability in the machining process. In addition, the deionized water can quickly absorb heat and take away the heat generated in the point machining process, reducing the deformation of the part.

[0032] In the embodiment, between step S3 and step 4, there is also a step of: finishing the side face boss of the rear bearing seat blank, the outer side machining part of the space oil injection hole on the rear bearing seat blank, and the mounting hole on the intermediate mounting edge. Specifically, by finishing the side face boss of the rear bearing seat blank, the outer side machining part of the space oil injection hole on the rear bearing seat blank, and the mounting hole on the intermediate mounting edge, the machining precision of the space oil injection hole is ensured. It should be understood that the above-mentioned parts and the position of the outer side opening of the space oil injection hole have a positional relationship. After ensuring the size of the above-mentioned parts, the machining position of the outer side opening of the space oil injection hole is accurate, which is conducive to ensuring the machining precision of the space oil injection hole.

[0033] In the embodiment, between step S6 and step S7, there is also a step of: using the machining electrode to electro-machine the side oil injection hole connected to the internal oil passage from the inner cavity of the rear bearing seat. Specifically, after the machining of the space oil injection hole is realized, the side oil injection hole is machined to complete the machining of all oil injection holes on the rear bearing seat, so as to ensure that the subsequent flow and flow direction test is qualified. It should be understood that the rear bearing seat includes the space oil injection hole and the side oil injection hole.

[0034] In the embodiment, a step of heat treating the rear bearing seat blank is further included between the step S2 and the step S3. Specifically, the heat treatment is performed after the welding to improve the structure and performance of the welded joint, eliminate and reduce the welding residual stress, improve the corrosion resistance of the welded joint, and improve the plasticity and toughness of the welded joint.

[0035] In the embodiment, the rough machining of the rear bearing seat blank includes the following steps: rough machining the large end face, the small end face, the intermediate mounting edge, the inner hole and the outer circle of the rear bearing seat blank. Specifically, the rough machining of the large end face, the small end face, the intermediate mounting edge, the inner hole and the outer circle of the rear bearing seat blank is performed to remove excess material, prepare for subsequent finishing, improve material performance, and facilitate the conversion of the machining reference.

[0036] In the embodiment, in the step S4, a machining allowance of 0.1mm is left after the semi-finishing of the intermediate mounting edge. Specifically, the machining allowance of 0.1mm is left to remove the welding deformation after semi-finishing, improve the machining accuracy, and prepare for subsequent finishing to remove the reference deformation and ensure the qualification of the part machining.

[0037] In the embodiment, the rear bearing seat includes a plurality of space oil injection holes, and the plurality of space oil injection holes are arranged at intervals along the circumference of the rear bearing seat. Specifically, the rear bearing seat realizes the quantitative and directional injection of lubricating oil to other components through the plurality of space oil injection holes to lubricate and cool, so that the plurality of space oil injection holes need to be machined in sequence during the machining process, and the outer openings of the space oil injection holes are welded and plugged after the machining is completed. After multiple welding, the reference deformation of the part is inevitably caused, so that the reference deformation of the part needs to be removed by finishing to ensure the qualification of the part machining.

[0038] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A process for machining a rear bearing seat with a spatial oil injection hole, characterized in that, Specifically comprising the following steps: S1, rough machining is first performed on the rear bearing seat blank, then the rear bearing seat blank is clamped with the end face and the outer circle of the intermediate mounting edge as the axial reference surface and the radial reference circle, and the large end face of the rear bearing seat blank faces upward, and then the oil passage window and the end face oil hole are processed on the rear bearing seat blank to open the oil hole on the large end face of the rear bearing seat blank; S2, a cover plate is welded at the oil passage window, and a plug is welded at the oil hole of the small end face of the rear bearing seat blank; S3, the end face, the inner hole and the outer circle of the rear bearing seat blank are finished, and the intermediate mounting edge is semi-finished to remove the welding deformation; S4, a machining electrode is used to electrically machine a space oil injection hole through the internal oil passage to communicate to the inner cavity of the rear bearing seat from the outside of the rear bearing seat, and in the process of electric machining, cooling liquid is continuously injected into the internal oil passage of the rear bearing seat through the oil hole on the large end face of the rear bearing seat; S5, the outside opening of the space oil injection hole is plugged and welded, wherein the outside opening of the space oil injection hole is close to the intermediate mounting edge; S6, the intermediate mounting edge is finished to remove the welding deformation and ensure that the axial reference surface and the radial reference circle meet the size requirements, thereby obtaining a rear bearing seat with a space oil injection hole; S7, flow and flow direction test is performed on the rear bearing seat to check whether it is qualified.

2. The process for machining a rear bearing seat with a spatial oil injection hole according to claim 1, characterized in that, In step S4, the diameter of the machining electrode is 0.5mm, and the hole diameter value of the space oil injection hole is Φ0.57mm-Φ0.59mm.

3. The process for machining a rear bearing seat with a spatial oil injection hole according to claim 1, characterized in that, In step S4, the machining depth of the electric machining is 30mm.

4. The process for machining a rear bearing seat with a spatial oil injection hole according to claim 1, characterized in that, The cooling liquid in step S4 is deionized water.

5. The process for machining a rear bearing seat with a spatial oil injection hole according to any one of claims 1-4, characterized in that, Between step S3 and step S4, the following step is further included: The side face boss of the rear bearing seat blank, the outside machining part of the space oil injection hole on the rear bearing seat blank and the mounting hole on the intermediate mounting edge are finished.

6. The process for machining a rear bearing seat with a spatial oil injection hole according to any one of claims 1-4, characterized in that, Between step S6 and step S7, the following step is further included: A side oil injection hole communicating to the internal oil passage is electrically machined from the inner cavity of the rear bearing seat by using a machining electrode.

7. The process for machining a rear bearing seat with a spatial oil injection hole according to any one of claims 1-4, characterized in that, Between step S2 and step S3, the following step is further included: The rear bearing seat blank is heat treated.

8. The process for machining a rear bearing seat with a spatial oil injection hole according to any one of claims 1-4, characterized in that, The step of first rough machining the rear bearing seat blank includes the following steps: The large end face, the small end face, the intermediate mounting edge, the inner hole and the outer circle of the rear bearing seat blank are first rough machined.

9. The process for machining a rear bearing seat with a spatial oil injection hole according to any one of claims 1-4, characterized in that, In step S4, a machining allowance of 0.1mm is left after semi-finishing the intermediate mounting edge.

10. The process for machining a rear bearing seat with a spatial oil injection hole according to any one of claims 1-4, characterized in that, The rear bearing seat includes a plurality of space oil injection holes, and the plurality of space oil injection holes are arranged at intervals along the circumference of the rear bearing seat.

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