Shot blasting device and process method for semi-closed cavity of disc-shaft integrated wheel disc

Abstract

The shot blasting device comprises an L-shaped spray gun barrel, a shot blasting channel is formed in an inner cavity of the L-shaped spray gun barrel, and a first reflection pad is arranged at the break angle of the shot blasting channel. A cone collecting section is arranged on the outer wall of the L-shaped spray gun barrel. An inclined baffle is arranged at the tail end of the L-shaped spray gun barrel and used for changing the shot ejection direction. The inclined baffle is inclined relative to the short edge of the L-shaped spray gun barrel, and a second reflecting pad is arranged at the inclined baffle. According to the shot peening strengthening method for the annular semi-closed inner cavity of the TC17 material disc and shaft integrated structure wheel disc, the shot peening strength and the coverage rate of a deep cavity area which cannot be reached by a traditional spray gun can be achieved through simple and convenient operation in the shot peening strengthening process of parts. And meanwhile, shot blasting of the annular semi-closed inner cavity is strengthened, the machining time is shortened, and the percent of pass of products can be increased.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of disc shaft machining, in particular to a shot blasting device and process method for a semi-closed cavity of a disc shaft integrated wheel disc. BACKGROUND

[0002] The manufacturing technology of an aero-engine high-pressure compressor rotor part is one of the more complex technologies in the turbine manufacturing industry, and is also a manufacturing technology involving a very wide range of professional fields. Therefore, the manufacturing technology level of the disc shaft part as the rotor part reflects the manufacturing technology level of the engine to a certain extent.

[0003] Shot peening is a method that can effectively improve the fatigue strength and stress corrosion cracking resistance of metals, and the integral disc shaft part of the aero-engine high-pressure compressor generally needs to be subjected to shot peening.

[0004] The part is integrated into an integral body by a three-stage wheel disc and a front shaft neck, and an annular semi-closed cavity is formed between the shaft neck and the wheel disc, as shown in the drawing, one side is a long spoke plate and a disc core hole, and the other side is a shaft neck opening, the structure makes the conventional shot blasting nozzle unable to enter, and cannot meet the design requirements for shot blasting in the cavity. The shot blasting of the cavity structure can usually be carried out by using a lance or a reflection gun, but the structure of the part cannot meet the entering conditions of the rotating lance. In machining, the machining of such parts can be carried out by using secondary manual tool mounting and demounting or using a spring type tool, but shot peening is different from machining, and the flow and pressure need to be adjusted before the shot stream contacts the sprayed surface, so that the shot stream stably contacts the machining surface, and therefore the late installation or spring type structure also cannot meet the machining conditions. Figure 1 SUMMARY The application aims to provide a shot blasting device and process method for a semi-closed cavity of a disc shaft integrated wheel disc, which mainly aims at the annular semi-closed cavity structure shot peening of the integral structure part of the TC17 material high-pressure compressor wheel disc and shaft neck, designs a special structure nozzle device according to the structure characteristics of the region, combines the actual shot range adjustment of the nozzle to design a shot blasting process route of a divided region overlap, completes the shot peening of all parts in the cavity, maximally satisfies that all sprayed parts are directly sprayed, reduces the process method of rebound shot blasting, thereby guarantees the uniformity and surface coverage of the sprayed surface to achieve the requirements of the design on the shot blasting of the part.

[0005] To achieve the above-mentioned purpose, the application provides the following technical scheme: a shot blasting device for a semi-closed cavity of a disc shaft integrated wheel disc, comprising an L-shaped shot gun barrel, an inner cavity of the L-shaped shot gun barrel is provided with a shot blasting channel, and a first reflection pad is arranged at the corner of the shot blasting channel.

[0006]

[0007] ​Preferably, the outer wall of the L-shaped spray gun barrel is provided with a tapering section for forming an avoidance with the part to obtain a larger activity space.

[0008] Preferably, the end of the L-shaped spray gun barrel is provided with an inclined baffle for changing the direction of the projectile; the inclined baffle is inclined to the short side of the L-shaped spray gun barrel, and a second reflecting pad is arranged at the inclined baffle.

[0009] Preferably, the first end of the L-shaped spray gun barrel is provided with a circumferential key groove for connecting with the outlet end of the shot blasting equipment.

[0010] Preferably, the outlet of the L-shaped spray gun barrel is circular.

[0011] Preferably, the end of the L-shaped spray gun barrel and the inclined baffle form an oval outlet.

[0012] The present application also provides the following technical scheme: a process method, comprising the following steps Step 1: the L-shaped spray gun barrel with an inclined baffle is used to enter from the disc side disc core, and reciprocate along the lower edge of the spoke plate into the cavity, the disc is kept rotating, and the shot blasting of the spoke plate and a part of the R area in the cavity is completed; Step 2: the L-shaped spray gun barrel is used to enter from the disc side disc core, the spray gun is inclined, and is moved to the position of the R area at the bottom of the inner cavity, a fixed position shot blasting method is used, and the R area is subjected to shot blasting; Step 3: the L-shaped spray gun barrel is used to enter from the disc side disc core, and is moved obliquely along the rotating arm at an angle of 35 degrees, and the shot blasting of the rotating arm part in the inner cavity is completed.

[0013] Compared with the prior art, the present application has the following beneficial effects: By using the shot blasting strengthening method of the disc shaft integrated disc ring semi-closed cavity, the part can be subjected to shot blasting strengthening in a simple operation, the shot blasting intensity and coverage of the deep cavity area that cannot be reached by the traditional spray gun are achieved, the shot blasting of the ring semi-closed cavity is strengthened, the processing time is shortened, and the qualified rate of the product is improved.

[0014] By the above method, the feasibility of shot blasting strengthening of the structure part is greatly improved, and with the increase of the company's production capacity and the popularization and application of the technology, the economic benefit will also be greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The present application is an aero-engine high-pressure compressor disc shaft.

[0016] Figure 2 The present application is a disc shaft integrated disc semi-closed cavity shot blasting device schematic diagram.

[0017] Figure 3The schematic diagram of the shot blasting device for the semi-closed cavity of the disc-shaft integrated disc is another embodiment of the present application.

[0018] Figure 4 The process method diagram of the shot blasting device for the semi-closed cavity of the disc-shaft integrated disc is another embodiment of the present application.

[0019] Figure 5 The process method diagram of the shot blasting device for the semi-closed cavity of the disc-shaft integrated disc is another embodiment of the present application.

[0020] Figure 6 The process method diagram of the shot blasting device for the semi-closed cavity of the disc-shaft integrated disc is another embodiment of the present application.

[0021] 1, keyway; 2, L-shaped spray gun barrel; 3, shot blasting channel; 4, converging section; 5, first reflection pad; 6, inclined baffle; 7, oval-shaped outlet. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0023] Please refer to Figure 2 The present application provides a technical solution: a shot blasting device for the semi-closed cavity of a disc-shaft integrated disc, comprising an L-shaped spray gun barrel 2, the inner cavity of the L-shaped spray gun barrel 2 is provided with a shot blasting channel 3, and the corner of the shot blasting channel 3 is provided with a first reflection pad 5 for reflecting the shot. The reflection pad is a metal material with strong impact resistance, and an impact resistance coating can usually be added.

[0024] The outer wall of the L-shaped spray gun barrel 2 is provided with a converging section 4 for forming an avoidance with the part to obtain a larger activity space. The first end of the L-shaped spray gun barrel 2 is provided with a circumferential keyway 1 for connecting with the outlet end of the shot blasting equipment.

[0025] The outlet of the L-shaped spray gun barrel 2 is circular, and the surface of the outlet is polished smooth without steps, burrs and other excesses that hinder the flow of the shot.

[0026] The slightly longer side of the L-shaped spray gun barrel 2 is 210 mm in length, and the slightly shorter side is 90 mm in length, which is usually a steel structure; the inner diameter of the shot blasting channel 3 is 10 mm; the outer diameter of the L-shaped spray gun barrel 2 is 19 mm, and the outer tube diameter after the diameter change is 15 mm.

[0027] Please refer to Figure 3The application also provides a technical solution, which is a twice-reflection structure, and the end of the L-shaped shot gun barrel 2 is provided with an inclined baffle 6 for changing the direction of the shot.

[0028] The inclined baffle 6 is inclined at an angle of 35 degrees with respect to the short side of the L-shaped shot gun barrel 2, and the inclined baffle 6 is provided with a second reflection pad. Since the shot needs to be reflected twice to be shot out, in order to ensure that the shot is normally shot out, the coverage area can reach 70 degrees, that is, gradually weakens from 35 degrees to both sides. In order to meet the shot shooting requirements, the end of the L-shaped shot gun barrel 2 and the inclined baffle 6 form an oval-shaped outlet 7, and the surface of the outlet is polished smooth without steps, burrs and other obstacles to the flow of the shot.

[0029] The slightly longer side of the L-shaped shot gun barrel 2 has a barrel length of 210 mm, and the slightly shorter side has a barrel length of 90 mm, which is usually a steel structure; the inner diameter of the shot channel 3 is 10 mm; the outer diameter of the L-shaped shot gun barrel 2 is 19 mm, and the outer diameter of the variable-diameter tube is 15 mm.

[0030] Please refer to Figures 4-6 The application provides a process method, which comprises the following steps: Step 1: The L-shaped shot gun barrel 2 with an inclined baffle 6 is used to enter from the disc side disc core, and reciprocate in the cavity along the lower edge of the spoke, and the disc is kept rotating to complete the shot peening of the spoke and a part of the R area (i.e. the transition corner of the spoke of the disc and the wall of the shaft neck cone barrel) in the cavity; Step 2: The L-shaped shot gun barrel 2 is used to enter from the disc side disc core, the shot gun is deviated by 25 degrees, and is moved to a position opposite the R area at the bottom of the inner cavity, and a fixed position shot peening method is used to complete the shot peening of the R area; Step 3: The L-shaped shot gun barrel 2 is used to enter from the disc side disc core, and is moved obliquely along the rotating arm at an angle of 35 degrees to complete the shot peening of the rotating arm part in the inner cavity.

[0031] The annular semi-closed cavity area of the workpiece is divided into three typical areas, which are the upper spoke horizontal area, the large transition R area at the bottom of the cavity and the inclined rotating arm area. Since the shot peening intensity in steps 1 and 2 is relatively high, and the shot peening intensity in step 3 is relatively low, the three areas are completed through steps 1-3 according to the structural characteristics of the three areas.

[0032] The processing of the upper spoke horizontal area, which is a typical spoke structure around the disc, is generally similar to a plane, and the difficulty lies in that it is poorly open and the closer to the large diameter, the smaller the space, and the greater the limitation on the nozzle. The L-shaped shot gun barrel 2 with an inclined baffle 6 is used for processing, and the shot flow coverage area of the nozzle reaches about 70 degrees, and the main shot flow direction is vertically upward and obliquely upward. Figure 4As shown, the part journal end is placed downward, the slightly longer side of the nozzle is connected to the equipment with a screw, and the slightly shorter side moves downward from top to bottom, passes through the disc core hole, and tightly adheres to the hub from small diameter to large diameter. The large diameter side is as close as possible to the inclined arm, leaving a gap, and attention should be paid to avoid collision. The verified process parameters are used for shot peening.

[0033] Processing of the cavity bottom large adapter R area, which is the deepest part of the annular cavity and the adapter part where the web surface intersects with the inclined arm surface. After step 1 is completed, there will still be unshot areas remaining, which need to be processed separately. For this structure, an L-shaped one-way reflection nozzle is used for processing, and a fixed-point shot peening method is used for the fixed position of the spray gun. As shown, the shot flow of the nozzle is horizontal, and with the increase of the distance from the part, it slightly diverges. The part journal end is placed downward, the slightly longer side of the nozzle is connected to the equipment with a screw, and the slightly shorter side moves downward from top to bottom, passes through the disc core hole, and is 25 degrees off from the horizontal direction. The nozzle is directly opposite the cavity bottom large adapter R area, and the distance between the nozzle and the sprayed surface is about 100 mm. Attention should be paid to the interference between the spray gun wall and the part to avoid collision. The verified process parameters are used for shot peening. Figure 6 Processing of the inclined arm area, which is a typical journal type product structure, similar to a trumpet-shaped tight structure. The part is approximately inclined at an angle of 35 degrees. Usually, the required shot intensity here is weak, and low-intensity processing is required. For this structure, an L-shaped one-way reflection nozzle is used for processing, and the spray gun runs along the 35-degree inclination of the arm structure, moving obliquely, as shown.

[0034] Figure 5 As shown, the shot flow of the nozzle is horizontal, and with the increase of the distance from the part, it slightly diverges. The part journal end is placed downward, the slightly longer side of the nozzle is connected to the equipment with a screw, and the slightly shorter side moves downward from top to bottom, passes through the disc core hole, and is 25 degrees off from the horizontal direction. The nozzle is directly opposite the cavity bottom large adapter R area, and the distance between the nozzle and the sprayed surface is about 100 mm. Attention should be paid to the interference between the spray gun wall and the part to avoid collision. The verified process parameters are used for shot peening.

[0035] After completing the shot peening of this part, the coverage rate needs to be checked. Since the closed cavity cannot be directly visually inspected, the endoscope probe can be inserted into the cavity to magnify 10 times to check the surface coverage rate. According to the coverage rate, the shot peening time and program points are adjusted until the design requirements are met. The processing of other areas of the part can be carried out according to the conventional shot peening process.

[0036] ​Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that the technical solutions described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalent features, and 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 shot peening device for a semi-enclosed cavity of an integrated disc and shaft wheel, characterized in that: It includes an L-shaped spray gun barrel (2), the inner cavity of which is provided with a shot peening channel (3), and a first reflective pad (5) is provided at the bend of the shot peening channel (3).

2. The shot peening device for the semi-enclosed cavity of the integrated disc and shaft wheel as described in claim 1, characterized in that: The outer wall of the L-shaped spray gun barrel (2) is provided with a tapered section (4) to avoid the parts and obtain a larger operating space.

3. The shot peening device for the semi-enclosed cavity of the integrated disc and shaft wheel as described in claim 1, characterized in that: The L-shaped spray gun barrel (2) has a circumferential keyway (1) at its head end for connection with the outlet end of the shot peening equipment.

4. The shot peening device for the semi-enclosed cavity of the integrated disc and shaft wheel according to claim 3, characterized in that: The L-shaped spray gun barrel (2) is provided with an inclined baffle (6) at its end to change the direction of the projectile; The inclined baffle (6) is inclined at 35 degrees to the short side of the L-shaped spray gun barrel (2), and a second reflective pad is provided at the inclined baffle (6).

5. The shot peening device for the semi-enclosed cavity of the integrated disc and shaft wheel according to claim 1, characterized in that: The outlet of the L-shaped spray gun (2) is circular.

6. The shot peening device for the semi-enclosed cavity of the integrated disc and shaft wheel according to claim 4, characterized in that: The end of the L-shaped spray gun barrel (2) forms an elliptical outlet (7) with the inclined baffle (6).

7. A process method, implemented based on the shot peening device for the semi-enclosed cavity of the integrated disc and shaft wheel as described in claim 4, characterized in that: Includes the following steps Step 1: The L-shaped spray gun barrel (2) with inclined baffle (6) enters from the center of the disk on one side and moves back and forth along the lower edge of the spokes into the cavity. The disk keeps rotating to complete the shot peening of the spokes and part of the R area in the cavity. Step 2: Using an L-shaped spray gun barrel (2), the spray gun enters from the center of the disc from one side. The spray gun is tilted 25 degrees and moved to the position of the R area at the bottom of the inner cavity. The R area is shot peened using a fixed position shot peening method. Step 3: Use an L-shaped spray gun barrel (2) to enter from the center of the disc on one side, move obliquely along the rotating arm at a 35-degree angle, and complete the shot peening of the rotating arm part in the inner cavity.

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