CN108818324B - Composite strengthening method of thin-wall wheel disc - Google Patents
Composite strengthening method of thin-wall wheel disc Download PDFInfo
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- CN108818324B CN108818324B CN201810754114.3A CN201810754114A CN108818324B CN 108818324 B CN108818324 B CN 108818324B CN 201810754114 A CN201810754114 A CN 201810754114A CN 108818324 B CN108818324 B CN 108818324B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C3/00—Abrasive blasting machines or devices; Plants
- B24C3/02—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other
- B24C3/04—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other stationary
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/10—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for compacting surfaces, e.g. shot-peening
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
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Abstract
The invention belongs to the technology of part surface treatment, and relates to a shot blasting device and a composite strengthening method suitable for a thin-wall wheel disc of an aircraft engine. The shot blasting device comprises a base, a right support, a left support, a main shaft, a transmission system, a driving motor and wedge nails, wherein the lower ends of the right support and the left support are welded on the base; the upper end of the transmission system is connected with the main shaft, the lower end of the transmission system is connected with the driving motor, and the driving motor enables the main shaft to rotate along the axis of the main shaft through the transmission system. The wheel disc is suspended in the air through the support and rotates along with the main shaft in the air, so that the attitude adjustment range of the spray gun is favorably enlarged, the selection range of the spraying angle is enlarged, and the accessibility of shot blasting at interference parts such as tenon teeth and the like is favorably improved; particularly in order to reduce the deformation of the disc.
Description
Technical Field
The invention belongs to the technology of part surface treatment, and relates to a composite strengthening method for a thin-wall wheel disc suitable for an aircraft engine.
Background
The service environment of the thin-wall wheel disc of the aircraft engine is very severe, and the thin-wall wheel disc is subjected to the combined action of multiple factors such as high stress, high speed, high temperature and the like, so that the risk of fatigue failure caused by the structure and the surface stress concentration effect is high. The shot blasting is an effective method for improving the fatigue performance of the thin-wall wheel disc, and a large number of shots moving at high speed are used for impacting the surface of a material to enable the surface of the material to generate elastic-plastic deformation repeatedly and form a tissue strengthening layer and a residual compressive stress layer with certain depth, so that the overall fatigue performance of the material is improved. Because of the obvious anti-fatigue effect, the shot blasting process is widely applied to the processing and manufacturing of thin-wall wheel discs of aero-engines at home and abroad at present.
The thin-wall wheel disc generally refers to a wheel disc with the minimum thickness of a wheel disc not exceeding 15mm, and the problems of low structural rigidity and high machining precision requirement exist, and the difficulty in controlling the size of a molded surface is high. The prior traditional thin-wall wheel disc shot blasting process method has three defects: 1) the process is single, different process parameters cannot be adopted according to the structural strength of different parts of the thin-wall wheel disc, and the problem of sacrificing fatigue performance for controlling deformation exists, so that the shot peening strengthening effect cannot be fully exerted; 2) the dimension of the thin-wall wheel disc after shot blasting is out of tolerance, and the wheel disc is seriously deformed because the traditional method adopts a mode of sequentially shot blasting on two surfaces of the wheel disc; 3) the surface roughness of the mortises and the disc cores after shot blasting is too large, so that the local surface stress concentration coefficient is obvious, and the high-cycle and low-cycle fatigue failure risks exist.
Disclosure of Invention
The purpose of the invention is: a composite strengthening method suitable for a thin-wall wheel disc of an aeroengine is used for reducing shot blasting deformation, reducing the surface roughness value, improving the shot blasting strengthening effect and meeting the drawing requirements.
The technical scheme of the invention is as follows:
a composite strengthening method of a thin-wall wheel disc adopts the following shot blasting device:
the shot blasting device of the thin-wall wheel disc comprises a base, a right support, a left support, a main shaft, a transmission system, a driving motor and wedge nails, wherein the lower ends of the right support and the left support are welded on the base; the upper end of the transmission system is connected with the main shaft, the lower end of the transmission system is connected with the driving motor, and the driving motor enables the main shaft to rotate along the axis of the main shaft through the transmission system.
The method for carrying out composite reinforcement comprises the following steps:
(1) and clamping the thin-wall wheel disc:
mounting the thin-wall wheel disc at the middle position of the main shaft, and mounting the main shaft on the right bracket and the left bracket to ensure that the distance between the thin-wall wheel disc and the left bracket is the same as that between the thin-wall wheel disc and the right bracket; two wedge nails are symmetrically inserted into the left side and the right side of a gap between the thin-wall wheel disc and the main shaft respectively; connecting a driving motor with a main shaft through a transmission system;
(2) and composite shot peening:
(2.1) symmetrically placing the left spray gun and the right spray gun on the left side and the right side of the thin-wall wheel disc, and ensuring that the distance between the left spray gun and the left side of the thin-wall wheel disc is consistent with the distance between the right spray gun and the right side of the thin-wall wheel disc, wherein the distances are both 50-500 mm;
and (2.2) turning on a driving motor to enable the main shaft to drive the thin-wall wheel disc to rotate, wherein the rotating speed is 0.1-10 rpm.
(2.3) opening the shot blasting machine, simultaneously spraying shots by the left spray gun and the right spray gun, firstly carrying out shot blasting on the thin-wall wheel disc for the first time, wherein the sequence of shot blasting parts is as follows: the process parameters of the disc core, the spoke plate, the connecting R angle and the mortise are as follows:
the shot blasting process parameters of the disc center are as follows: the diameter of the shot is 0.3 mm-0.6 mm, the spray angle is 70-90 degrees, the shot blasting strength is 0.15 mmA-0.35 mmA, and the cumulative coverage rate is 100-200 percent.
The shot blasting process parameters of the spoke plate are as follows: if the minimum thickness of the radial plate is not more than 2mm, the diameter of the shot is 0.1 mm-0.3 mm, the spray angle is 70-90 degrees, the shot blasting strength is 0.01 mmA-0.10 mmA, and the cumulative coverage rate is 100-200 percent; if the minimum thickness of the radial plate is more than 2mm and less than 6mm, the diameter of the shot is 0.1 mm-0.3 mm, the spray angle is 70-90 degrees, the shot blasting strength is 0.03 mmA-0.15 mmA, and the cumulative coverage rate is 100% -200%; if the minimum thickness of the radial plate is more than or equal to 6mm, the diameter of the shot is 0.3 mm-0.6 mm, the spray angle is 70-90 degrees, the shot blasting strength is 0.15 mmA-0.25 mmA, and the cumulative coverage rate is 100% -200%;
the shot blasting process parameters of the transfer R angle are as follows: the diameter of the shot is 0.3 mm-0.6 mm, the spray angle is 70-90 degrees, the shot blasting strength is 0.15 mmA-0.25 mmA, and the cumulative coverage rate is 100-200 percent;
the shot blasting process parameters of the mortise are as follows: the diameter of the shot is 0.3 mm-0.6 mm, the spray angle is 45-60 degrees, the shot blasting strength is 0.10 mmA-0.30 mmA, and the cumulative coverage rate is 100-200 percent;
and (3) carrying out second shot blasting after adjusting the parameters, wherein the sequence of shot blasting parts is as follows: the process parameters of the disc core, the spoke plate, the connecting R angle and the mortise are as follows:
the shot blasting process parameters of the disc center are as follows: the diameter of the shot is 0.1 mm-0.3 mm, the spray angle is 70-90 degrees, the shot blasting strength is 0.03 mmA-0.10 mmA, and the cumulative coverage rate is 200-400 percent;
the shot blasting process parameters of the spoke plate are as follows: if the minimum thickness of the spoke plate is less than 6mm, the second shot blasting is not carried out; if the minimum thickness of the radial plate is more than or equal to 6mm, the diameter of the shot is 0.1 mm-0.3 mm, the spray angle is 70-90 degrees, the shot blasting strength is 0.05 mmA-0.10 mmA, and the cumulative coverage rate is 200-400 percent;
the shot blasting process parameters of the transfer R angle (102) are as follows: the diameter of the shot is 0.1 mm-0.3 mm, the spray angle is 70-90 degrees, the shot blasting strength is 0.05 mmA-0.10 mmA, and the cumulative coverage rate is 200-400 percent;
the shot blasting process parameters of the mortise are as follows: the diameter of the shot is 0.1 mm-0.3 mm, the spray angle is 45-60 degrees, the shot blasting strength is 0.03 mmA-0.10 mmA, and the cumulative coverage rate is 200-400 percent;
and (2.4) after the shot blasting is finished, closing the shot blasting machine, closing the driving motor and taking down the thin-wall wheel disc.
The diameter of the main shaft is 1 to 12 percent smaller than that of the central hole of the thin-wall wheel disc; the wedge nail is made of resin or plastic, the minimum thickness H is 50% -90% of the clearance d between the main shaft and the central hole of the thin-wall wheel disc, and the maximum thickness H is 1.5-2.0 times of the clearance d between the main shaft and the central hole of the thin-wall wheel disc.
The invention has the advantages and beneficial effects that
1) The wheel disc is suspended in the air through the bracket, so that the shot blasting is favorably carried out by adopting a double-side spraying process on one hand, and the axial deformation of the wheel disc is reduced; on the other hand, the wheel disc rotates along with the main shaft in the air, so that the attitude adjustment range of the spray gun is favorably enlarged, the selection range of the spraying angle is enlarged, and the shot blasting accessibility of interference parts such as tenon teeth and the like is favorably improved;
2) the wedge nails are adopted to fix the wheel disc, compared with a pin fixing mode, the wedge nail mode can reduce the interference on shot blasting of the disc center and is beneficial to improving the accessibility of the shot blasting;
3) by adopting the composite shot blasting method, the shot blasting intensity of the second shot blasting is smaller than that of the first shot blasting, so that the surface roughness value is favorably reduced, the local stress concentration of the surface is reduced, and the shot blasting strengthening effect is fully exerted;
4) aiming at the thin-wall wheel disc, the shot blasting sequence of a disc center, a spoke plate, a switching R angle and a mortise is adopted, so that the deformation of the disc part is reduced;
5) when the minimum thickness of the web portion is too small (less than 6mm), shot blasting is performed only once in order to reduce deformation. The composite strengthening method disclosed by the invention is proved by a comparative test that the shot peening strengthening effect is improved by more than 50%, the surface roughness is reduced by more than 15%, and the size of a mortise and tenon tooth rolling rod and the key size of a web plate meet the requirements of drawings.
Drawings
FIG. 1 is a schematic view of the structure of a shot-blasting machine according to the present invention.
FIG. 2 is a schematic view showing the structure of a wedge pin of the shot-blasting machine of the present invention.
Detailed Description
The present invention is described in further detail below. Referring to fig. 1 and 2, the shot blasting device of the thin-wall wheel disc is characterized in that: the wedge nail driving device comprises a base 2, a right support 3, a left support 8, a main shaft 4, a transmission system 5, a driving motor 6 and wedge nails 7. The base 2, the right bracket 3 and the left bracket 8 form a bracket through welding, the lower end of the right bracket 3 is welded with the upper surface of the base 2 into a whole, and the lower end of the left bracket 8 is welded with the upper surface of the base 2 into a whole; the upper end of the right bracket 3 is connected with the right end of the main shaft 4 through a bearing, the upper end of the left bracket 8 is connected with the left end of the main shaft 4 through a bearing, and the main shaft 4 is in interference fit with an inner ring of the bearing and can be detached; the upper end of the transmission system 5 is connected with the right end of the main shaft 4, the lower end of the transmission system 5 is connected with the driving motor 6, and the driving motor 6 enables the main shaft 4 to rotate along the axis through the transmission system 5.
The composite strengthening method comprises the following steps:
1. clamping the thin-wall wheel disc:
sequentially enabling the left end of the main shaft 4 to pass through the right support 3, the central hole of the thin-wall wheel disc 1 and the left support 8 from right to left, and enabling the thin-wall wheel disc (1) to be located in the centers of the left support and the right support and to be the same in distance with the left support and the right support; two wedge nails 7 are symmetrically inserted into the left side and the right side of the thin-wall wheel disc 1 respectively; the upper end and the lower end of the transmission system 5 are respectively connected with the main shaft 4 and the driving motor 6.
2. And (3) composite shot blasting reinforcement:
2.1, symmetrically placing the left spray gun and the right spray gun on the left side and the right side of the thin-wall wheel disc 1, and ensuring that the distance between the left spray gun and the left side of the thin-wall wheel disc 1 is consistent with the distance between the right spray gun and the right side of the thin-wall wheel disc 1 and is 50-500 mm.
And 2.2, turning on the driving motor to enable the spindle 4 to drive the thin-wall wheel disc 1 to rotate at the rotating speed of 0.1-10 rpm.
2.3, opening the shot blasting machine, simultaneously spraying shots by the left spray gun and the right spray gun, firstly carrying out shot blasting on the thin-wall wheel disc 1, wherein the shot blasting positions are in the following sequence: a hub 104, a web 103, a transition R-angle 102, and a mortise 101; and (3) carrying out second shot blasting after adjusting the parameters, wherein the sequence of shot blasting parts is as follows: a hub 104, a web 103, a transition R-angle 102, and a mortise 101; wherein, the shot diameter, the spray angle, the shot strength and the cumulative coverage of the shot peen of two times are shown in the following table 1:
TABLE 1 composite shot peening Process parameters
And 2.4, after the shot blasting is finished, closing the shot blasting machine, closing the driving motor 6, and taking down the thin-wall wheel disc 1.
The diameter of a main shaft 4 of the shot blasting device is 1 to 12 percent smaller than that of a central hole of the thin-wall wheel disc 1; the wedge nail 7 is made of resin or plastic, the minimum thickness H is 50% -90% of the clearance d between the main shaft 4 and the central hole of the thin-wall wheel disc 1, and the maximum thickness H is 1.5-2.0 times of the clearance d between the main shaft 4 and the central hole of the thin-wall wheel disc 1.
The working principle of the invention is as follows: the thin-wall wheel disc is fixed and suspended through the shot blasting device, shot blasting strengthening is simultaneously carried out on two surfaces of the thin-wall wheel disc through two spray guns, homogeneous surface residual compressive stress fields with equal amplitude and same depth can be generated on the two surfaces of the wheel disc, and therefore deformation of structures such as a wheel disc web plate, a mortise and the like of the wheel disc after shot blasting due to difference of the surface residual stress fields is reduced; the shot blasting device suspends the thin-wall wheel disc to be sprayed at the central position of the main shaft of the bracket, and the wheel disc rotates by adopting the transmission of the bearing, so that the wheel disc can be ensured to be uniformly sprayed; the left bracket and the right bracket do not interfere with the spray gun, so that the spray gun can have sufficient moving space and a larger spray angle range, and the universality and the safety of the process are improved; in addition, the wedge nail is adopted to fix the wheel disc and avoid the phenomenon that the clamp of the traditional method shields the shot blasting area of the disc center, thereby improving the shot blasting efficiency and quality.
In addition, for the composite strengthening method, large-size shot and large or medium) shot blasting strength are firstly adopted to process the wheel disc, so that a deeper residual compressive stress field and a deformation strengthening layer can be generated on the surface of the wheel disc material, and fatigue crack propagation can be inhibited; and the small-size shot and the small shot blasting strength are adopted, so that the surface roughness value can be reduced, and the surface residual compressive stress value can be further improved, thereby being beneficial to inhibiting fatigue crack initiation. Through the secondary shot peening strengthening, the integral fatigue resistance of the thin-wall wheel disc is obviously improved, and the service life is prolonged.
Example 1
The adopted transmission system 5 and the driving motor 6 are shelf products, and the minimum thickness of the thin-wall wheel disc is 2.5 mm.
The shot blasting device comprises a base 2, a right support 3, a left support 8, a main shaft 4, a transmission system 5, a driving motor 6 and wedge nails 7. The base 2, the right bracket 3 and the left bracket 8 form a bracket through welding, the lower end of the right bracket 3 is welded with the upper surface of the base 2 into a whole, and the lower end of the left bracket 8 is welded with the upper surface of the base 2 into a whole; the upper end of the right bracket 3 is connected with the right end of the main shaft 4 through a bearing, the upper end of the left bracket 8 is connected with the left end of the main shaft 4 through a bearing, and the main shaft 4 is in interference fit with an inner ring of the bearing and can be detached; the upper end of the transmission system 5 is connected with the right end of the main shaft 4, the lower end of the transmission system 5 is connected with the driving motor 6, and the driving motor 6 enables the main shaft 4 to rotate along the axis through the transmission system 5.
The composite strengthening method of the shot blasting device of the thin-wall wheel disc comprises the following steps:
1. clamping the thin-wall wheel disc:
1.1, sequentially passing the left end of a main shaft 4 through a right support 3, a central hole of a thin-wall wheel disc 1 and a left support 8 from right to left to ensure that the thin-wall wheel disc 1 is positioned in the centers of the left support and the right support and has the same distance with the left support and the right support; two wedge nails 7 are symmetrically inserted into the left side and the right side of the thin-wall wheel disc 1 respectively; the upper end and the lower end of the transmission system 5 are respectively connected with the main shaft 4 and the driving motor 6.
2. And (3) composite shot blasting reinforcement:
2.1, symmetrically placing the left spray gun and the right spray gun on the left side and the right side of the thin-wall wheel disc 1, and ensuring that the distance between the left spray gun and the left side of the thin-wall wheel disc 1 is consistent with the distance between the right spray gun and the right side of the thin-wall wheel disc 1 and is 100 mm.
And 2.2, turning on a driving motor to enable the spindle 4 to drive the thin-wall wheel disc 1 to rotate at the rotating speed of 1 rpm.
2.3, opening the shot blasting machine, simultaneously spraying shots by the left spray gun and the right spray gun, firstly carrying out shot blasting on the thin-wall wheel disc 1, wherein the shot blasting positions are in the following sequence: a hub 104, a web 103, a transition R-angle 102, and a mortise 101; and (3) carrying out second shot blasting after adjusting the parameters, wherein the sequence of shot blasting parts is as follows: a hub 104, a web 103, a transition R-angle 102, and a mortise 101; wherein, the shot diameter, the spray angle, the shot strength and the cumulative coverage of the shot peen of two times are shown in the following table 1:
TABLE 1 composite shot peening Process parameters
And 2.4, after the shot blasting is finished, closing the shot blasting machine, closing the driving motor 6, and taking down the thin-wall wheel disc 1.
The diameter of a main shaft 4 of the shot blasting device is 5 percent smaller than that of a central hole of the thin-wall wheel disc 1; the wedge nail 7 is made of resin or plastic, the minimum thickness H is 70% of the clearance d between the main shaft 4 and the central hole of the thin-wall wheel disc 1, and the maximum thickness H is 1.8 times of the clearance d between the main shaft 4 and the central hole of the thin-wall wheel disc 1.
Example 2
The minimum thickness of the thin-wall wheel disk web is 10 mm.
TABLE 1 composite shot peening Process parameters
Claims (1)
1. A composite strengthening method of a thin-wall wheel disc adopts a shot blasting device which comprises the following steps: the wedge nail type hydraulic support comprises a base (2), a right support (3), a left support (8), a main shaft (4), a transmission system (5), a driving motor (6) and wedge nails (7), wherein the lower ends of the right support (3) and the left support (8) are welded on the base (2), the upper end of the right support (3) is connected with the right end of the main shaft (4) through a bearing, the upper end of the left support (8) is connected with the left end of the main shaft (4) through a bearing, and the main shaft (4) is in interference fit with an inner ring of the bearing and can be detached; the upper end of the transmission system (5) is connected with the main shaft (4), the lower end of the transmission system (5) is connected with the driving motor (6), and the driving motor (6) enables the main shaft (4) to rotate along the axis of the main shaft through the transmission system (5);
the method is characterized by comprising the following composite strengthening steps:
1) thin-wall wheel disc clamping
The thin-wall wheel disc (1) is arranged in the middle of the main shaft (4), and then the main shaft (4) is arranged on the right bracket (3) and the left bracket (8), so that the distance between the thin-wall wheel disc (1) and the left bracket and the distance between the thin-wall wheel disc and the right bracket are the same; two wedge nails (7) are symmetrically inserted into the left side and the right side of a gap between the thin-wall wheel disc (1) and the main shaft (4) respectively; a driving motor (6) is connected with a main shaft (4) through a transmission system (5);
2) composite shot peening
2.1) symmetrically placing the left spray gun and the right spray gun on the left side and the right side of the thin-wall wheel disc (1) to ensure that the distance between the left spray gun and the left side of the thin-wall wheel disc (1) is consistent with the distance between the right spray gun and the right side of the thin-wall wheel disc (1), and the distances are both 50-500 mm;
2.2) turning on a driving motor to enable a main shaft (4) to drive a thin-wall wheel disc (1) to rotate at the rotating speed of 0.1-10 rpm;
2.3), open the peening machine, left spray gun and right spray gun jet the shot simultaneously, carry out the peening to thin wall rim plate (1) earlier for the first time, the precedence order at peening position is: the process comprises the following steps of (1) forming a disc center (104), a web (103), a transition R corner (102) and a mortise (101), wherein the process parameters are as follows:
the shot blasting process parameters of the disk center (104) are as follows: the diameter of the shot is 0.3 mm-0.6 mm, the spray angle is 70-90 degrees, the shot blasting strength is 0.15 mmA-0.35 mmA, and the cumulative coverage rate is 100-200 percent;
the shot blasting process parameters of the web (103) are as follows: if the minimum thickness of the radial plate is not more than 2mm, the diameter of the shot is 0.1 mm-0.3 mm, the spray angle is 70-90 degrees, the shot blasting strength is 0.01 mmA-0.10 mmA, and the cumulative coverage rate is 100-200 percent; if the minimum thickness of the radial plate is more than 2mm and less than 6mm, the diameter of the shot is 0.1 mm-0.3 mm, the spray angle is 70-90 degrees, the shot blasting strength is 0.03 mmA-0.15 mmA, and the cumulative coverage rate is 100% -200%; if the minimum thickness of the radial plate is more than or equal to 6mm, the diameter of the shot is 0.3 mm-0.6 mm, the spray angle is 70-90 degrees, the shot blasting strength is 0.15 mmA-0.25 mmA, and the cumulative coverage rate is 100% -200%;
the shot blasting process parameters of the transfer R angle (102) are as follows: the diameter of the shot is 0.3 mm-0.6 mm, the spray angle is 70-90 degrees, the shot blasting strength is 0.15 mmA-0.25 mmA, and the cumulative coverage rate is 100-200 percent;
the shot blasting process parameters of the mortise (101) are as follows: the diameter of the shot is 0.3 mm-0.6 mm, the spray angle is 45-60 degrees, the shot blasting strength is 0.10 mmA-0.30 mmA, and the cumulative coverage rate is 100-200 percent;
and (3) carrying out second shot blasting after adjusting the parameters, wherein the sequence of shot blasting parts is as follows: the process comprises the following steps of (1) forming a disc center (104), a web (103), a transition R corner (102) and a mortise (101), wherein the process parameters are as follows:
the shot blasting process parameters of the disk center (104) are as follows: the diameter of the shot is 0.1 mm-0.3 mm, the spray angle is 70-90 degrees, the shot blasting strength is 0.03 mmA-0.10 mmA, and the cumulative coverage rate is 200-400 percent;
the shot blasting process parameters of the web (103) are as follows: if the minimum thickness of the spoke plate is less than 6mm, the second shot blasting is not carried out; if the minimum thickness of the radial plate is more than or equal to 6mm, the diameter of the shot is 0.1 mm-0.3 mm, the spray angle is 70-90 degrees, the shot blasting strength is 0.05 mmA-0.10 mmA, and the cumulative coverage rate is 200-400 percent;
the shot blasting process parameters of the transfer R angle (102) are as follows: the diameter of the shot is 0.1 mm-0.3 mm, the spray angle is 70-90 degrees, the shot blasting strength is 0.05 mmA-0.10 mmA, and the cumulative coverage rate is 200-400 percent;
the shot blasting process parameters of the mortise (101) are as follows: the diameter of the shot is 0.1 mm-0.3 mm, the spray angle is 45-60 degrees, the shot blasting strength is 0.03 mmA-0.10 mmA, and the cumulative coverage rate is 200-400 percent;
2.4) after the shot blasting is finished, closing the shot blasting machine, closing the driving motor (6) and taking down the thin-wall wheel disc (1).
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