Machining method for deep blind groove in titanium alloy bearing seat

Abstract

The invention discloses a method for machining a deep blind groove in a titanium alloy bearing seat, which comprises the following steps of: S1, performing large-allowance roughing on a part by adopting numerical control milling so as to form a U-shaped groove in the part; s2, on the basis of the electromachining equipment expert database, a first electric gauge is given according to related size requirements of the part material, the electrode material and the deep blind groove, so that a first electromachining main parameter is obtained from the electromachining equipment expert database according to the first electric gauge; s3, the first electromachining main parameters and the graphite electrode are adopted for conducting electric spark rough machining on the U-shaped groove in the radial direction, so that a square groove is formed in the part; s4, on the basis of the electromachining equipment expert database, a second electric gauge is given according to the relevant size requirements of the part material, the electrode material and the deep blind groove, so that a second electromachining main parameter is obtained from the electromachining equipment expert database according to the second electric gauge; and S5, carrying out translational equal-allowance electric spark finish machining on the square groove by adopting a second electromachining main parameter and a graphite electrode so as to form a deep blind groove with a set size on the part.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing housing processing, and in particular, to a processing method for deep blind grooves on a titanium alloy bearing housing. Background Art

[0002] The information provided in this section is for the purpose of generally presenting the background of the present application. To the extent described in this section, the work of the currently named inventors and aspects that may not constitute prior art descriptions at the time of filing are neither expressly nor implicitly considered prior art to the present application.

[0003] The bearing housing is an important component of the gas generator in an aeroengine. With the rapid development of aeroengines, the bearing housing has a high degree of functional integration, a complex structure, many machining parts in the cavity, and poor tool accessibility. The bearing housing in the gas generator of an aeroengine is usually made of titanium alloy material to meet the stringent requirements of aeroengines through the lightweight, high-temperature resistance, corrosion resistance and other characteristics of the titanium alloy bearing housing, thereby directly improving the thrust-to-weight ratio, reliability and economy of aeroengines.

[0004] Deep blind grooves need to be machined on the titanium alloy bearing housing to fix the corresponding workpieces. The deep blind groove refers to a square groove located at a depth of 108 mm in the bearing housing cavity, with the bottom of the groove tangent to the side wall in the radial direction, and an axial depth of 20 mm × width of 17 mm × radial depth of 12 mm. The existing processing scheme is to first use numerical control milling to machine the groove width to the final size, leaving a 0.1 mm allowance for the axial depth and radial depth of the groove. During the milling process, an arc-shaped root will naturally form at the radial tangent. The volume of the arc-shaped root is proportional to the tool diameter. Since the arc-shaped root cannot be reached by the tool, in order to improve the machining quality and efficiency, a tungsten copper electrode is usually used for electrical discharge root cleaning to form the final size.

[0005] However, the above processing scheme has the following problems:

[0006] 1) When electrical discharge root cleaning is performed on the titanium alloy bearing housing, the metal is thrown out and solidified before being completely melted, resulting in unstable machining conditions, easy occurrence of arcing, large loss of tungsten copper electrodes, poor surface quality of the deep blind groove, and low machining quality and efficiency;

[0007] 2) When using a tungsten copper electrode for electrical discharge root cleaning, rough machining and finish machining need to be carried out in sequence. The rough machining path is axial machining, with low machining efficiency. The finish machining is radial translation to expand the machining around. During finish machining, it is necessary to connect the flat surface to the tool joint formed after rough machining of numerical control milling and electrical discharge. The time required to connect the flat surface is up to 4 hours, seriously affecting the machining efficiency. Summary of the Invention

[0008] The present invention provides a processing method for deep blind grooves on a titanium alloy bearing seat, aiming to solve the technical problems of low processing quality and low processing efficiency of deep blind grooves on existing titanium alloy bearing seats.

[0009] According to one aspect of the present invention, there is provided a processing method for deep blind grooves on a titanium alloy bearing seat, comprising the following steps: S1, performing rough machining with large allowance on the part to be processed by numerical control milling to form a U-shaped groove on the part, wherein the groove width, axial depth, and radial depth of the U-shaped groove all leave a first set allowance; S2, based on the expert database of the electro-discharge machining equipment, given the first electrical parameter standard according to the material of the part to be processed, the electrode material, and the relevant dimensional requirements of the deep blind groove, so as to obtain the first main electro-discharge machining parameters from the expert database of the electro-discharge machining equipment according to the first electrical parameter standard; S3, performing rough electro-discharge machining of the U-shaped groove along the radial direction with the first main electro-discharge machining parameters and a graphite electrode to form a square groove on the part to be processed, wherein the groove width, axial depth, and radial depth of the square groove all leave a second set allowance; S4, based on the expert database of the electro-discharge machining equipment, given the second electrical parameter standard according to the material of the part to be processed, the electrode material, and the relevant dimensional requirements of the deep blind groove, so as to obtain the second main electro-discharge machining parameters from the expert database of the electro-discharge machining equipment according to the second electrical parameter standard; S5, performing equal-allowance finish electro-discharge machining with translation of the square groove with the second main electro-discharge machining parameters and a graphite electrode, and the translation amount is the second set allowance, so as to form a deep blind groove with set dimensions on the part to be processed.

[0010] As a further improvement of the above technical solution:

[0011] Further, the first main electro-discharge machining parameters are multiple groups. During the machining process, the multiple groups of first main electro-discharge machining parameters increase as the machining area of the part to be processed increases.

[0012] Further, the second electrical parameter standard includes surface roughness, and the second main electro-discharge machining parameters decrease as the surface roughness in the given second electrical parameter standard decreases.

[0013] Further, the first set allowance is 0.1 mm - 0.2 mm.

[0014] Further, the second set allowance is 0.05 mm.

[0015] Further, during the rough electro-discharge machining process, according to the stability of the discharge process, the first main electro-discharge machining parameters are adjusted to make the graphite electrode in a set machining state.

[0016] Further, during the finish electro-discharge machining process, according to the stability of the discharge process, the second main electro-discharge machining parameters are adjusted to make the graphite electrode in a set machining state.

[0017] Further, step S1 includes the following steps: First, a rod with a diameter of φ25mm is used to hold a drill with a diameter of φ5mm to machine a 20mm processing hole on the deep cavity step surface tangent to the side wall in the inner cavity of the part to be machined. Then, a rod with a diameter of φ25mm is used to hold a milling cutter with a set diameter and a set overhang length to enter the processing hole for layer milling of the part to be machined, so as to form a U-shaped groove on the part to be machined.

[0018] Further, the set diameter is φ6mm.

[0019] Further, the set overhang length is 130mm - 133mm.

[0020] The present invention has the following beneficial effects:

[0021] Processing method for deep blind groove on titanium alloy bearing seat of the present invention. Numerically controlled milling is used to perform rough machining with large allowance on the part to be machined, so as to form a U-shaped groove on the part to be machined, and a first set allowance is left for the groove width, axial depth and radial depth of the U-shaped groove, so as to increase the machining area during subsequent electrical discharge machining and improve the stability of electrical discharge machining; based on the expert database of electrical machining equipment, according to the material of the part to be machined, the electrode material and the relevant dimensional requirements of the deep blind groove, a first electrical parameter is given, so as to obtain the first main electrical machining parameters from the expert database of electrical machining equipment according to the first electrical parameter. By giving reasonable first main electrical machining parameters, it is beneficial to reduce the loss of the machining electrode during subsequent rough electrical discharge machining and it is easier to ensure that the dimensions are qualified; the first main electrical machining parameters and a graphite electrode are used to perform rough electrical discharge machining of the U-shaped groove along the radial direction, so as to form a square groove on the part to be machined, and a second set allowance is left for the groove width, axial depth and radial depth of the square groove. By using a graphite electrode to replace a tungsten-copper electrode for rough electrical discharge machining and changing the machining method from axial machining to radial machining, the machining area is increased, the electrode loss is reduced, the cost is lowered, the machining quality and machining efficiency are improved, and the square groove can avoid the appearance of a jointing table, which is beneficial to improving the machining efficiency of subsequent finish machining; based on the expert database of electrical machining equipment, according to the material of the part to be machined, the electrode material and the relevant dimensional requirements of the deep blind groove, a second electrical parameter is given, so as to obtain the second main electrical machining parameters from the expert database of electrical machining equipment according to the second electrical parameter. By giving reasonable second main electrical machining parameters, it is beneficial to reduce the loss of the machining electrode during subsequent finish electrical discharge machining and it is easier to ensure that the dimensions are qualified; the second main electrical machining parameters and a graphite electrode are used to perform equal-allowance electrical discharge finish machining with translation of the square groove, and the translation amount is the second set allowance, so as to form a deep blind groove with set dimensions on the part to be machined. The machining area is large, the electrode loss is small, the discharge is stable, it is easy to control the tool compensation amount, and the final dimensions can be machined in one pass, and the machining efficiency is high; compared with the prior art, this solution innovatively breaks through the conventional understanding that a conventional graphite electrode is used for rough machining with large allowance and a tungsten-copper electrode is used for finish machining. After rough machining with large allowance on the part to be machined, by reasonably giving electrical machining parameters, a graphite electrode is used to perform rough electrical discharge machining and finish electrical discharge Processing, while improving the processing quality and efficiency, also reduces the processing cost, has strong practicability, and is suitable for wide promotion and application.

[0022] In addition to the purposes, features and advantages described above, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the drawings. Description of the Drawings

[0023] The drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0024] Figure 1 is a block diagram of the steps of a processing method for deep blind grooves on a titanium alloy bearing seat according to a preferred embodiment of the present invention;

[0025] Figure 2 is a radial cross-sectional view of a workpiece to be processed after step S1 in the processing method for deep blind grooves on a titanium alloy bearing seat according to a preferred embodiment of the present invention;

[0026] Figure 3 is a radial cross-sectional view of a workpiece to be processed after step S3 in the processing method for deep blind grooves on a titanium alloy bearing seat according to a preferred embodiment of the present invention;

[0027] Figure 4 is a radial cross-sectional view of a processed workpiece in the processing method for deep blind grooves on a titanium alloy bearing seat according to a preferred embodiment of the present invention;

[0028] Figure 5 is an enlarged view of the remelted layer of a processed workpiece using the prior art;

[0029] Figure 6 is an enlarged view of the remelted layer of a processed workpiece in the processing method for deep blind grooves on a titanium alloy bearing seat according to a preferred embodiment of the present invention;

[0030] Figure 7 is an enlarged view at 350 times under an electron microscope of a processed workpiece using the prior art;

[0031] Figure 8 is an enlarged view at 350 times under an electron microscope of a processed workpiece in the processing method for deep blind grooves on a titanium alloy bearing seat according to a preferred embodiment of the present invention. Detailed Embodiments

[0032] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways defined and covered by the following.

[0033] As Figures 1 - 4As shown in the figure, the processing method of the deep blind groove on the titanium alloy bearing seat in this embodiment includes the following steps: S1. Use numerical control milling to rough machine the part to be machined with a large allowance to form a U-shaped groove on the part. Among them, the groove width, axial depth, and radial depth of the U-shaped groove all leave a first set allowance; S2. Based on the expert database of the electric processing equipment, according to the material of the part to be machined, the electrode material, and the relevant dimensional requirements of the deep blind groove, give the first electrical parameter standard to obtain the first main electrical processing parameter from the expert database of the electric processing equipment according to the first electrical parameter standard; S3. Use the first main electrical processing parameter and the graphite electrode to conduct rough electrical discharge machining of the U-shaped groove along the radial direction to form a square groove on the part to be machined. Among them, the groove width, axial depth, and radial depth of the square groove all leave a second set allowance; S4. Based on the expert database of the electric processing equipment, according to the material of the part to be machined, the electrode material, and the relevant dimensional requirements of the deep blind groove, give the second electrical parameter standard to obtain the second main electrical processing parameter from the expert database of the electric processing equipment according to the second electrical parameter standard; S5. Use the second main electrical processing parameter and the graphite electrode to conduct equal-allowance electrical discharge finish machining with translation of the square groove, and the translation amount is the second set allowance to form a deep blind groove with set dimensions on the part to be machined.

[0034] As Figures 1 - 4As shown, specifically, for the processing method of the deep blind groove on the titanium alloy bearing seat of the present invention, numerical control milling is used to perform rough machining with a large margin on the part to be processed, so as to form a U-shaped groove on the part to be processed, and a first set margin is left for the groove width, axial depth, and radial depth of the U-shaped groove, so as to increase the machining area during subsequent electrical discharge machining and improve the stability of electrical discharge machining; based on the expert database of electrical processing equipment, according to the material of the part to be processed, the electrode material, and the relevant dimensional requirements of the deep blind groove, a first electrical parameter standard is given, so as to obtain the first main electrical processing parameters from the expert database of electrical processing equipment according to the first electrical parameter standard. By giving reasonable first main electrical processing parameters, it is beneficial to reduce the loss of the machining electrode during subsequent rough electrical discharge machining and it is easier to ensure that the dimensions are qualified; the first main electrical processing parameters and a graphite electrode are used to perform rough electrical discharge machining of the U-shaped groove along the radial direction, so as to form a square groove on the part to be processed, and a second set margin is left for the groove width, axial depth, and radial depth of the square groove. By using a graphite electrode to replace a tungsten-copper electrode for rough electrical discharge machining and changing the machining method from axial machining to radial machining, the machining area is increased, the electrode loss is reduced, the cost is lowered, the machining quality and efficiency are improved, and the square groove can avoid the appearance of a jointing table, which is beneficial to improving the machining efficiency of subsequent finish machining; based on the expert database of electrical processing equipment, according to the material of the part to be processed, the electrode material, and the relevant dimensional requirements of the deep blind groove, a second electrical parameter standard is given, so as to obtain the second main electrical processing parameters from the expert database of electrical processing equipment according to the second electrical parameter standard. By giving reasonable second main electrical processing parameters, it is beneficial to reduce the loss of the machining electrode during subsequent finish electrical discharge machining and it is easier to ensure that the dimensions are qualified; the second main electrical processing parameters and a graphite electrode are used to perform equal-amount translational finish electrical discharge machining of the square groove, and the translational amount is the second set margin, so as to form a deep blind groove with set dimensions on the part to be processed. The machining area is large, the electrode loss is small, the discharge is stable, it is easy to control the tool compensation amount, and the machining efficiency is high; compared with the prior art, this solution innovatively breaks through the conventional understanding that a conventional graphite electrode is used for rough machining with a large margin and a tungsten-copper electrode is used for finish machining. After rough machining with a large margin on the part to be processed, by reasonably giving electrical processing parameters, a graphite electrode is used to perform rough electrical discharge machining and finish electrical discharge machining in sequence. While improving the machining quality and efficiency, the machining cost is also reduced, and it has strong practicability and is suitable for wide promotion and application.

[0035] It should be understood that the expert database of electrical processing equipment in this embodiment is an expert parameter database based on the FORME600 forming electrical discharge equipment.

[0036] Optionally, the first electrical parameter standard includes machining area, discharge gap, and surface roughness.

[0037] In this embodiment, there are multiple groups of first main electro - machining parameters. During the machining process, the multiple groups of first main electro - machining parameters increase as the machining area of the part to be machined increases. Specifically, during rough machining, the machining area of the arc - shaped base increases from small to large. Therefore, the multiple groups of first main electro - machining parameters increase as the machining area of the part to be machined increases, so as to realize variable - area and variable - parameter machining, ensure the matching of machining parameters and machining area, avoid the situation of small area with large parameters or large area with small parameters, ensure stable discharge, normal electrode loss, high machining efficiency and good machining quality.

[0038] In this embodiment, the second electrical parameter includes surface roughness, and the first main electro - machining parameter decreases as the surface roughness in the given second electrical parameter decreases. Specifically, during rough and finish machining, based on the surface roughness in the given second electrical parameter, the first main electro - machining parameter decreases as the surface roughness decreases, so that the first main electro - machining parameter is reasonable, ensuring stable discharge during electrical discharge finish machining and good machining quality, while achieving the fastest machining efficiency.

[0039] Optionally, the second electrical parameter further includes machining area and discharge gap.

[0040] In this embodiment, the first set allowance is 0.1mm - 0.2mm. Specifically, when the first set allowance is between 0.1mm and 0.2mm, the machining efficiency and machining quality of subsequent electrical discharge machining are high; when the first set allowance is less than 0.1mm, the machining quality of electrical discharge machining is low; when the first set allowance is greater than 0.2mm, the machining efficiency of electrical discharge machining is low.

[0041] It should be understood that, compared with the prior art, although the allowance of the part to be machined after digital milling is increased, since the electrical discharge machining of deep blind grooves belongs to small - area machining, when the first set allowance is set reasonably, it will not have too much impact on reducing the machining efficiency.

[0042] In this embodiment, the second set allowance is 0.05mm. Specifically, when the second set allowance is 0.05mm, the groove width of the deep blind groove will not increase, and there is no need for multiple machining, with high machining efficiency; when the second set allowance is less than 0.05mm, affected by the discharge gap, the groove width of the deep blind groove will increase and the size will be unqualified; when the second set allowance is greater than 0.05mm, the amount of additional machining is difficult to control and multiple machining is required to be qualified.

[0043] In this embodiment, during the electrical discharge rough machining process, according to the stability of the discharge process, the first main electro - machining parameter is adjusted to make the graphite electrode in the set machining state.

[0044] Specifically, during rough electrical discharge machining (EDM), the stability of the machining state and the change of the machining allowance are monitored through the machining monitoring interface, and the main parameters of the first EDM are adjusted accordingly. When the discharge process is unstable, a full-scale short-circuit display will appear. The reasons for the instability include excessive current, excessive pulse width, and too small pulse interval. At this time, the main parameters of the first EDM can be adjusted to improve the discharge situation. First, increase the pulse interval to eliminate ionization, then reduce the pulse width to reduce the discharge time. The servo reference voltage can also be increased, and it is checked whether it is negative polarity machining to make the graphite electrode in the set machining state and obtain a stable machining size.

[0045] Optionally, the set machining state refers to the optimal machining state in which there is no black smoke, no red light emission, and no ablation on the surface during the machining process.

[0046] In this embodiment, during the finish EDM process, the main parameters of the second EDM are adjusted according to the stability of the discharge process to make the graphite electrode in the set machining state. Specifically, during finish EDM, the stability of the machining state and the change of the machining allowance are monitored through the machining monitoring interface, and the main parameters of the first EDM are adjusted accordingly. When the discharge process is unstable, a full-scale short-circuit display will appear. The reasons for the instability include excessive current, excessive pulse width, and too small pulse interval. At this time, the main parameters of the second EDM can be adjusted to improve the discharge situation. First, increase the pulse interval to eliminate ionization, then reduce the pulse width to reduce the discharge time. The servo reference voltage can also be increased, and it is checked whether it is negative polarity machining to make the graphite electrode in the set machining state and obtain a stable machining size.

[0047] In this embodiment, step S1 includes the following steps: First, a drill bit with a diameter of φ5mm is clamped by a rod with a diameter of φ25mm to machine a 20mm machining hole on the deep cavity step surface at the side wall of the inner cavity of the part to be machined. Then, a milling cutter with a set diameter and a set overhang length is clamped by a rod with a diameter of φ25mm to enter the machining hole to perform layer-by-layer milling on the part to be machined, thereby forming a U-shaped groove on the part to be machined. Specifically, a 20mm machining hole is first machined by the drill bit, and then layer-by-layer milling is performed by the milling cutter to achieve rough machining with a large allowance of the part to be machined, which is beneficial to significantly reducing the wear of the milling cutter and reducing the tool cost.

[0048] In this embodiment, the set diameter is φ6mm. Specifically, when the set diameter is φ6mm, the machining quality of the milling cutter is high, the machining area of the arc-shaped root is small, and the subsequent EDM takes a short time; when the set diameter is greater than 6mm, the machining area of the arc-shaped root is large, and the subsequent EDM takes a long time; when the set diameter is less than 6mm, the rigidity of the milling cutter is too low, and the tool deflection is serious during machining, resulting in low machining quality.

[0049] In this embodiment, the overhang length is set to be between 130 mm and 133 mm. Specifically, when the set overhang length is between 130 mm and 133 mm, there will be no interference during machining, and the rigidity of the milling cutter is qualified; when the set overhang length is less than 130 mm, interference will occur during the machining of the milling cutter; when the set overhang length is greater than 133 mm, the rigidity of the milling cutter is too low, and the cutter deflection is serious during machining, resulting in low machining quality.

[0050] As Figures 1 - 4 shown, on a certain type of titanium alloy bearing block, the deep blind groove to be machined is located 120 mm deep in the deep cavity of the titanium alloy bearing block, with an axial depth of 20 mm, a groove width of 17 mm, and a radial depth of 12 mm. The specific machining steps of this embodiment are as follows:

[0051] First, use a φ5 drill bit clamped by a φ25 mm extension bar, with a tool overhang length of 130 mm, to machine a 20 mm deep hole. Then, use a φ6 mm milling cutter clamped by a φ25 extension bar, with a tool overhang length of 130 mm, and the programming trajectory is U-shaped. Perform 10 milling operations with a layer thickness of 2 mm to form a U-shaped groove on the titanium alloy bearing block with an axial depth of 19.8 mm, a groove width of 16.8 mm, a radial depth of 11.8 mm, and a radially arc-shaped root.

[0052] Based on the electro-machining equipment expert database, according to the relevant dimensional requirements of titanium alloy, graphite, and the deep blind groove, a first electrical parameter is given to obtain the first main electro-machining parameters from the electro-machining equipment expert database. The first main electro-machining parameters are shown in Table 1:

[0053] Table 1 First main electro-machining parameters

[0054] I (A) T (us) P (us) 8 8.7 42 17 24 100 21 27 116 29 32 116 39 56 133

[0055] Adopt the first main electro-machining parameters and a graphite electrode to perform rough electro-discharge machining of the U-shaped groove along the radial direction to form a square groove on the titanium alloy bearing block with an axial depth of 19.95 mm, a groove width of 16.95 mm, and a radial depth of 11.95 mm;

[0056] Based on the electro-machining equipment expert database, according to the relevant dimensional requirements of titanium alloy, graphite, and the deep blind groove, a second electrical parameter is given to obtain the second main electro-machining parameters from the electro-machining equipment expert database. The second main electro-machining parameters are shown in the following table:

[0057] Table 2 Second main electro-machining parameters

[0058] I (A) T (us) P (us) 17 24 100 10 10 75 8 8.7 42

[0059] Using the second main electrical discharge machining parameter and a graphite electrode to perform equal-allowance electro-discharge finish machining of a square groove with a jog amount of 0.05 mm, so as to form a deep blind groove with an axial depth of 20 mm, a groove width of 17 mm, and a radial depth of 12 mm on a titanium alloy bearing block, with a machining qualification rate of 100%. Compared with the existing machining scheme, the machining efficiency is increased by about 6 times.

[0060] It should be understood that I is the average current, T is the pulse width, and P is the pulse interval.

[0061] Such as Figure 5 and Figure 6 As shown, for the machined part of this embodiment compared with the machined part in the prior art, the remelting layer thickness is low, there is no arc burn, and the surface unevenness is low.

[0062] Such as Figure 7 and Figure 8 As shown, for the machined part of this embodiment compared with the machined part in the prior art, when observed under the same magnification by an electron microscope, the surface consistency is good and the "pattern" display is small.

[0063] It should be noted that the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0064] It should be noted that for the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that this application is not limited by the described action sequence, because according to this application, certain steps may be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0065] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A processing method for deep blind grooves on a titanium alloy bearing seat, characterized in that, It includes the following steps: S1. Use numerical control milling to rough machine the part to be machined with a large allowance to form a U-shaped groove on the part. Herein, a first set allowance is reserved for the groove width, axial depth, and radial depth of the U-shaped groove; S2. Based on the expert database of the electric machining equipment, given the first electrical parameter standard according to the material of the part to be machined, the electrode material, and the relevant dimensional requirements of the deep blind groove, so as to obtain the first main electrical machining parameters from the expert database of the electric machining equipment according to the first electrical parameter standard; S3. Use the first main electrical machining parameters and a graphite electrode to conduct rough electric discharge machining of the U-shaped groove along the radial direction to form a square groove on the part to be machined. Herein, a second set allowance is reserved for the groove width, axial depth, and radial depth of the square groove; S4. Based on the expert database of the electric machining equipment, given the second electrical parameter standard according to the material of the part to be machined, the electrode material, and the relevant dimensional requirements of the deep blind groove, so as to obtain the second main electrical machining parameters from the expert database of the electric machining equipment according to the second electrical parameter standard; S5. Use the second main electrical machining parameters and a graphite electrode to conduct equal-allowance electric discharge finish machining with translation of the square groove, and the translation amount is the second set allowance, so as to form a deep blind groove with set dimensions on the part to be machined.

2. The processing method of the deep blind groove on the titanium alloy bearing seat according to claim 1, wherein The first main electrical machining parameters are multiple groups. During the machining process, the multiple groups of the first main electrical machining parameters increase as the machining area of the part to be machined increases.

3. The machining method of the deep blind groove on the titanium alloy bearing block according to claim 1, characterized in that, The second electrical parameter standard includes surface roughness, and the second main electrical machining parameters decrease as the surface roughness in the given second electrical parameter standard decreases.

4. The machining method of the deep blind groove on the titanium alloy bearing seat according to claim 1, characterized in that, The first set allowance is 0.1 mm - 0.2 mm.

5. The machining method of the deep blind groove on the titanium alloy bearing block according to claim 1, characterized in that, The second set allowance is 0.05 mm.

6. The machining method of the deep blind groove on the titanium alloy bearing seat according to any one of claims 1-5, characterized in that During the rough electric discharge machining process, adjust the first main electrical machining parameters according to the stability of the discharge process so that the graphite electrode is in the set machining state.

7. The machining method of the deep blind groove on the titanium alloy bearing block according to any one of claims 1-5, characterized in that, During the electric discharge finish machining process, adjust the second main electrical machining parameters according to the stability of the discharge process so that the graphite electrode is in the set machining state.

8. The processing method of the deep blind groove on the titanium alloy bearing housing according to any one of claims 1-5, characterized in that, Step S1 includes the following steps: First, use a rod with a diameter of φ25 mm to clamp a drill with a diameter of φ5 mm to machine a machining hole with a length of 20 mm on the deep cavity step surface at the inner cavity side wall of the part to be machined. Then, use a rod with a diameter of φ25 mm to clamp a milling cutter with a set diameter and a set overhang length to enter the machining hole to conduct layer-by-layer milling of the part to be machined, thereby forming a U-shaped groove on the part to be machined.

9. The machining method of the deep blind groove on the titanium alloy bearing block according to claim 8, characterized in that, The set diameter is φ6 mm.

10. The machining method of the deep blind groove on the titanium alloy bearing block according to claim 8, characterized in that, The set overhang length is 130 mm - 133 mm.

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