Strength checking clamp for obtaining shot blasting strength in aeronautical part surface strengthening and working method of strength checking clamp

Abstract

The invention relates to the technical field of shot peening strengthening technology machining, in particular to a strength checking clamp for obtaining shot peening strength in aeronautical part surface strengthening and a working method of the strength checking clamp. According to the technical scheme, the device comprises a base slide rail part, a vertical slide rail part and a test block connecting plate, the base sliding rail part is a strip-shaped plate, a first positioning through hole is formed in one end of the strip-shaped plate, two parallel horizontal grooves are formed in the other end of the strip-shaped plate, the vertical sliding rail part is an L-shaped plate, the transverse edge of the vertical sliding rail part is fixedly arranged in the two horizontal grooves of the base sliding rail part and can move along the two horizontal grooves, two vertical grooves are formed in the longitudinal edge of the vertical sliding rail part, and the transverse edge of the vertical sliding rail part can move along the two horizontal grooves. The test block connecting plate is connected into a vertical groove in the longitudinal edge of the vertical slide rail part. According to the position requirements of shot blasting strength checking points of different parts, the shot blasting strength checking device meeting the verification requirement is obtained by adjusting the X-direction position, the Z-direction position and the angle alpha.

Description

Technical Field

[0001] The invention relates to the technical field of shot peening processing technology, and in particular to a strength checking fixture used for obtaining shot peening strength in the surface strengthening of aviation parts and a working method thereof. Background Art

[0002] Shot peening technology is mainly used in the surface strengthening process of aircraft engines, gas turbines, gears and other parts. Before performing surface strengthening technology, it is first necessary to verify the strength of the specified area or planned area of ​​the part according to the requirements of the technical drawings. At this time, a shot peening strength verification device (simulation fixture) will be used.

[0003] At present, the shot peening strength calibration device is used for strength calibration of single parts. Its disadvantages are: the position of each calibration point is fixed, the X and Z directions cannot be adjusted, and the angle (α) with the Y axis as the rotation axis cannot be adjusted. Especially for small batches and short cycle parts, the strength calibration production cycle is long, which affects delivery and wastes materials. Summary of the invention

[0004] The present invention solves the problems of long strength verification production cycle, delivery impact and material waste in existing shot peening strength verification devices, and provides a strength verification fixture for obtaining shot peening strength in surface strengthening of aviation parts and a working method thereof. The present invention obtains a shot peening strength verification device that meets the verification requirements by adjusting the X and Z position and adjusting the angle α according to the position requirements of the shot peening strength verification points of different parts.

[0005] In order to solve the above problems, the technical solution adopted by the present invention is: a strength checking fixture for obtaining shot peening strength in the surface strengthening of aviation parts, characterized in that it includes a base slide rail part, a vertical slide rail part, and a test block connecting plate;

[0006] The base slide rail portion is a strip plate, one end of which is provided with a positioning through hole, and the other end is provided with two parallel horizontal grooves. The vertical slide rail portion is an L-shaped plate, the horizontal edges of which are fixed in the two horizontal grooves of the base slide rail portion and can move along the two horizontal grooves. Two vertical grooves are provided on the longitudinal edges, and the test block connecting plate is connected to the vertical grooves of the longitudinal edges of the vertical slide rail portion.

[0007] Furthermore, the test block connecting plate includes connecting plate one or connecting plate two or connecting plate one and connecting plate two.

[0008] The structure of the connecting plate 1 comprises an L-shaped angle connecting plate, and the ends of the transverse sides of the angle connecting plate are connected to the angle rotating plate through a rotating connecting piece;

[0009] The connecting plate 2 is L-shaped, on which a standard test block 2 is arranged, and on which an ALEMN test piece is arranged.

[0010] Furthermore, when the test block connecting plates are connecting plate 1 and connecting plate 2, they can be moved up and down at the same time and fixed by bolts.

[0011] Furthermore, a second positioning through hole is provided between the two horizontal grooves of the base slide rail portion.

[0012] Furthermore, the first positioning through hole and the second positioning through hole are in a straight line.

[0013] Furthermore, the second positioning through hole is located at the center of the width of the base slide rail portion.

[0014] Furthermore, the horizontal groove is a T-shaped groove.

[0015] A working method of a strength checking fixture for obtaining shot peening strength in surface strengthening of aviation parts, comprising the following steps:

[0016] 1) Before use, give the position data of each shot peening intensity check point according to the area position that needs to be verified on the part drawing, including the distance in the X direction and the distance in the Z direction, as well as the angle α between the surface where the check point is located and the X direction;

[0017] 2) Connect the base slide rail part to the machine tool turntable through the positioning through hole 1, adjust the distance in the X direction through the horizontal groove, connect and fix it with the dovetail groove of the machine tool turntable through the positioning through hole 2, and ensure that the base slide rail part is installed firmly through the positioning through hole 1 and the positioning through hole 2;

[0018] 3) The lateral edge of the vertical slide rail part is connected to the horizontal groove of the base slide rail part through screws, and the Z-direction position is adjusted through the two vertical grooves of the vertical slide rail part;

[0019] 4) The standard test block is set on the horizontal side of the angle rotating plate or the second connecting plate. The ALMEN test piece is installed on the standard test block. The curved test piece is obtained by the shot peening process. The change in the straightness of the standard test block is used to indirectly verify the shot peening strength. The angle α in the X direction is adjusted by the angle rotating plate and the rotating connector. The verification range of the angle α is 0-180°;

[0020] 5) Use the adjusted shot peening strength calibration device, install the corresponding ALEMN test piece on the standard test block, and then compile a program on the shot peening CNC equipment to impact the test piece on the strength calibration surface through the shot flow with pressure and flow parameters, obtain the change value of the ALMEN test piece before and after, and obtain the shot peening intensity of a certain calibration position through the saturation curve calculation program.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1) The present invention can quickly obtain the desired shot peening intensity verification device according to the position requirements of the shot peening intensity verification points of different parts by adjusting the X, Z position and angle α. It is suitable for multiple parts and can obtain a shot peening intensity verification device that meets the verification requirements.

[0023] 2) The X and Z positions of the present invention are adjustable, and the angle (α) with the Y axis as the rotation axis direction is adjustable. It has high adaptability to small batch and short cycle parts, high material utilization rate, and reduced waste.

[0024] 3) The present invention can meet the requirements of any adjustment of the angle from 0° to 180°, can complete the strength verification test of the part surface parallel to the X-axis and perpendicular to the X-axis, and can perform shot peening strength verification test of the verification points located on the back of the hole, chamfer, inside the hole, groove side, etc.

[0025] 4) The shot peening technology of the present invention is to increase the compressive stress on the surface of the parts, improve the stress corrosion resistance of the parts, and increase the service life of the parts. This process is mainly used in the shot peening process of high-pressure turbine and low-pressure turbine parts of aircraft engines.

[0026] 5) The present invention is adaptable to the design requirements of different parts, has the characteristics of wide application range, adjustable distance and angle, reduced material waste and strong practicality, and can be assembled into the strength verification device required for a certain part in a short time. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention.

[0028] Figure 2 This is a schematic diagram of the structure in which the test block connecting plate is an angle connecting plate.

[0029] Figure 3 It is a schematic diagram of the structure of the test block connecting plate.

[0030] Figure 4 This is the saturation curve diagram when the shot peening intensity is 0.131.

[0031] Figure 5 It is a schematic diagram of the parts.

[0032] 1-base slide rail part, 2-vertical slide rail part, 3-positioning through hole one, 4-horizontal slot, 5-positioning through hole two, 6-vertical slot, 7-connecting plate one, 8-angle connecting plate, 9-rotating connecting piece, 10-angle rotating plate, 11-standard test block one, 12-connecting plate two, 13-standard test block two, 14-ALEMN test piece. DETAILED DESCRIPTION

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Embodiment 1:

[0036] A strength check fixture for obtaining shot peening strength in the surface strengthening of aviation parts, such as Figure 1 As shown, it includes a base slide rail portion 1, a vertical slide rail portion 2, a connecting plate 1 7 and a connecting plate 2 12;

[0037] The base slide rail portion 1 is a strip plate, one end of which is provided with a positioning through hole 1 3, and the other end is provided with two parallel horizontal grooves 4, and a positioning through hole 2 5 is provided between the two horizontal grooves 4. The vertical slide rail portion 2 is an L-shaped plate, and the horizontal edges are fixed in the two horizontal grooves 4 of the base slide rail portion 1 and can move along the two horizontal grooves 4. Two vertical vertical grooves 6 are provided on the longitudinal edge. The connecting plate 1 7 and the connecting plate 2 12 are respectively connected to the vertical grooves of the longitudinal edges of the vertical slide rail portion 2, and are provided on the left and right sides of the longitudinal edges of the vertical slide rail portion 2, and can be moved up and down at the same time, and are fixed by bolts.

[0038] The structure of the connecting plate 7 includes an L-shaped angle connecting plate 8, and the end of the transverse side of the angle connecting plate 8 is connected to the angle rotating plate 10 through a rotating connecting piece 9;

[0039] The connecting plate 12 is L-shaped, on which a standard test block 13 is arranged, and on which an ALEMN test piece 14 is arranged.

[0040] The positioning through hole 1 3 and the positioning through hole 2 5 are on a straight line.

[0041] The second positioning through hole 5 is located at the center of the width of the base slide rail part 1.

[0042] A working method of a strength checking fixture for obtaining shot peening strength in the surface strengthening of aviation parts comprises the following steps:

[0043] 1) Before use, give the position data of each shot peening intensity check point according to the area position that needs to be verified on the part drawing, including the distance in the X direction and the distance in the Z direction, as well as the angle α between the surface where the check point is located and the X direction;

[0044] 2) Connect the base slide rail part 1 to the machine tool turntable through the positioning through hole 1 3, adjust the distance in the X direction through the horizontal groove 4, connect and fix it with the dovetail groove of the machine tool turntable through the positioning through hole 2 5, and ensure that the base slide rail part 1 is installed firmly through the positioning through hole 1 3 and the positioning through hole 2 5;

[0045] 3) The lateral edge of the vertical slide rail part 2 is connected to the horizontal groove of the base slide rail part 1 by screws, and the Z-direction position is adjusted through the two vertical grooves of the vertical slide rail part 2;

[0046] 4) The standard test block is set on the lateral edge of the angle rotating plate 10 and the connecting plate 12. The ALMEN test piece is installed on the standard test block. The curved test piece is obtained by the shot peening process. The change in the straightness of the standard test block is used to indirectly verify the shot peening strength. The angle α in the X direction is adjusted by the angle rotating plate 10 and the rotating connecting member 9. The verification range of the angle α is 0-180°;

[0047] 5) Use the adjusted shot peening intensity verification device, install the corresponding ALEMN test piece A or N test piece on the standard test block, and then compile a program on the shot peening CNC equipment to impact the test piece on the strength verification surface with a shot flow with pressure and flow parameters, obtain the change value before and after the ALMEN test piece, and calculate the program through the saturation curve to obtain the shot peening intensity at a certain verification position.

[0048] Embodiment 2: Suitable for checking points with angles

[0049] A strength check fixture for obtaining shot peening strength in the surface strengthening of aviation parts, such as Figure 2 As shown, it includes a base slide rail part 1, a vertical slide rail part 2, and a connecting plate 7;

[0050] The base rail part 1 is a strip plate, one end of which is provided with a positioning through hole 13, and the other end is provided with two parallel horizontal grooves 4, and a positioning through hole 25 is provided between the two horizontal grooves 4; the vertical rail part 2 is an L-shaped plate, the horizontal edge is fixed in the two horizontal grooves 4 of the base rail part 1, and can move along the two horizontal grooves 4, and two vertical vertical grooves 6 are provided on the longitudinal edge, and the structure of the connecting plate 17 includes an L-shaped angle connecting plate 8, and the end of the horizontal edge of the angle connecting plate 8 is connected to the angle rotating plate 10 through a rotating connecting member 9; the longitudinal edge of the angle connecting plate 8 is connected to the vertical groove of the longitudinal edge of the vertical rail part 2 by screws. A standard test block 11 is provided on the angle rotating plate 10, and an ALEMN test piece is provided on the standard test block 11, and the longitudinal edge of the connecting plate 7 is connected to the vertical groove of the longitudinal edge of the vertical rail part 2 by screws.

[0051] As an implementation method in this embodiment, the positioning through hole 1 3 and the positioning through hole 2 5 are on a straight line.

[0052] As an implementation method in this embodiment, the second positioning through hole 5 is located at the center of the width of the base slide rail part 1.

[0053] A working method of a strength checking fixture for obtaining shot peening strength in the surface strengthening of aviation parts comprises the following steps:

[0054] 1) Before use, give the position data of each shot peening intensity check point according to the area position that needs to be verified on the part drawing, including the distance in the X direction and the distance in the Z direction, as well as the angle α between the surface where the check point is located and the X direction;

[0055] 2) Connect the base slide rail part 1 to the machine tool turntable through the positioning through hole 1 3, adjust the distance in the X direction through the horizontal groove 4, connect and fix it with the dovetail groove of the machine tool turntable through the positioning through hole 2 5, and ensure that the base slide rail part 1 is installed firmly through the positioning through hole 1 3 and the positioning through hole 2 5;

[0056] 3) The lateral edge of the vertical slide rail part 2 is connected to the horizontal groove of the base slide rail part 1 by screws, and the Z-direction position is adjusted through the two vertical grooves of the vertical slide rail part 2;

[0057] 4) A standard test block 11 is set on the angle rotating plate 10, and an ALMEN test piece is installed on the standard test block 11. The curved test piece is obtained by the shot peening process. The change in the straightness of the standard test block is used to indirectly verify the shot peening strength. The angle α in the X direction is adjusted by the angle rotating plate 10 and the rotating connecting member 9. The verification range of the angle α is 0-180°;

[0058] 5) Use the adjusted shot peening intensity verification device, install the corresponding ALEMN test piece on the standard test block, and then compile a program on the shot peening CNC equipment to impact the test piece on the strength verification surface with a shot flow with pressure and flow parameters to obtain the change value of the ALMEN test piece before and after, and calculate the program through the saturation curve to obtain the shot peening intensity of a certain verification position.

[0059] Chamfer position, during the shot peening strength verification process, the chamfer angle is generally 45°, and the angle rotating plate 10 needs to be adjusted to 45°, and then the vertical slide rail part 2 and the connecting piece 7 are in the appropriate position, fastened by screws, and then the strength of the position is checked.

[0060] Embodiment 3: Suitable for checking points without angles

[0061] A strength check fixture for obtaining shot peening strength in the surface strengthening of aviation parts, such as Figure 3 As shown, it includes a base slide rail portion 1, a vertical slide rail portion 2, and a connecting plate 12;

[0062] The base rail part 1 is a strip plate, one end of which is provided with a positioning through hole 1 3, and the other end is provided with two parallel horizontal grooves 4, and a positioning through hole 2 5 is provided between the two horizontal grooves 4; the vertical rail part 2 is an L-shaped plate, the horizontal edge is fixed in the two horizontal grooves 4 of the base rail part 1, and can move along the two horizontal grooves 4, and two vertical vertical grooves 6 are provided on the longitudinal edge, and the connecting plate 12 is L-shaped, and a standard test block 2 13 is provided on it, and an ALEMN test piece 14 is provided on the standard test block 2 13. The longitudinal edge of the connecting plate 2 12 is connected to the vertical groove 6 of the longitudinal edge of the vertical rail part 2 by screws.

[0063] As an implementation method in this embodiment, the positioning through hole 1 3 and the positioning through hole 2 5 are on a straight line.

[0064] As an implementation method in this embodiment, the second positioning through hole 5 is located at the center of the width of the base slide rail part 1.

[0065] A working method of a strength checking fixture for obtaining shot peening strength in the surface strengthening of aviation parts comprises the following steps:

[0066] 1) Before use, give the position data of each shot peening intensity check point according to the area position that needs to be verified on the part drawing, including the distance in the X direction and the distance in the Z direction, as well as the angle α between the surface where the check point is located and the X direction;

[0067] 2) Connect the base slide rail part 1 to the machine tool turntable through the positioning through hole 1 3, adjust the distance in the X direction through the horizontal groove 4, connect and fix it with the dovetail groove of the machine tool turntable through the positioning through hole 2 5, and ensure that the base slide rail part 1 is installed firmly through the positioning through hole 1 3 and the positioning through hole 2 5;

[0068] 3) The lateral edge of the vertical slide rail part 2 is connected to the horizontal groove of the base slide rail part 1 by screws, and the Z-direction position is adjusted through the two vertical grooves of the vertical slide rail part 2;

[0069] 4) The standard test block 13 is set on the lateral edge of the connecting plate 12, and the ALMEN test piece 14 is installed on the standard test block 13. The curved test piece is obtained by the shot peening process, and the change in the straightness of the standard test block 13 is used to indirectly verify the shot peening strength;

[0070] 5) Use the adjusted shot peening intensity verification device, install the corresponding ALEMN test piece 14 on the standard test block, and then compile a program on the shot peening CNC equipment to impact the test piece on the strength verification surface with a shot flow with pressure and flow parameters to obtain the change value before and after the ALMEN test piece 14, and calculate the program through the saturation curve to obtain the shot peening intensity at a certain verification position.

[0071] Horizontal position, during the shot peening strength verification process, the horizontal angle is generally 0°, and the connecting plate 2 12 is used, and then the vertical slide rail part 2 and the connecting piece 2 12 are moved to the appropriate position, fastened by screws, and then the strength of the position is checked.

[0072] “-” indicates the position where the part needs strength check, named as position A, such as Figure 5 As shown, the shot peening strength verification device is used to verify the strength of position A. Figure 3 The structure is as follows: first, N test pieces are installed on the standard test block 213, and the prescribed parameters are used. Only the movement speed of the spray gun is changed (parameters include: pressure, flow rate, distance, turntable speed, shot peening angle and spray gun movement speed) to perform shot peening on position A. The change in straightness (arc height value) of test piece A before and after shot peening is recorded. By changing the speed, the arc height values ​​of at least 4 test pieces A are obtained. Then, the saturation point (shot peening intensity) of point A is obtained through the saturation curve calculation program. The saturation point refers to the minimum duration of shot peening. When the time is doubled, the arc height increment of the test piece cannot exceed 10%, that is, the arc height value corresponding to the point where the arc height increment is 10% is the shot peening intensity. In this way, a saturation curve with a shot peening intensity of 0.131mm (N) is obtained. Figure 4 .

[0073] Shot peening saturation point: It is the minimum duration of shot peening. When the time is doubled, the arc height increase of the Almen test piece cannot exceed 10%.

[0074] Saturation curve: refers to a data curve showing the comparison between arc height and shot peening time, which is generated by arc height data points distributed over a period of shot peening time (at least four points), used to deduce the "inflection point" of the curve and can clearly determine the saturation point.

[0075] In the above description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed above.

[0076] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A strength check fixture for obtaining shot peening strength in the surface strengthening of aviation parts, characterized by: It comprises a base slide rail part (1), a vertical slide rail part (2), and a test block connecting plate; The base slide rail portion (1) is a strip plate, one end of which is provided with a positioning through hole (3), and the other end of which is provided with two parallel horizontal grooves (4); the vertical slide rail portion (2) is an L-shaped plate, the transverse edge of which is fixedly arranged in the two horizontal grooves (4) of the base slide rail portion (1) and can move along the two horizontal grooves (4); the longitudinal edge is provided with two vertical grooves (6); the test block connecting plate is connected to the vertical groove of the longitudinal edge of the vertical slide rail portion (2).

2. A strength checking fixture for obtaining shot peening strength in surface strengthening of aviation parts according to claim 1, characterized in that: The test block connecting plate comprises connecting plate 1 (7) or connecting plate 2 (12) or connecting plate 1 (7) and connecting plate 2 (12); The structure of the connecting plate 1 (7) comprises an L-shaped angle connecting plate (8), and the end of the transverse side of the angle connecting plate (8) is connected to the angle rotating plate (10) via a rotating connecting piece (9); The second connecting plate (12) is L-shaped, and a second standard test block (13) is arranged on it, and an ALEMN test piece (14) is arranged on the second standard test block (13).

3. A strength checking fixture for obtaining shot peening strength in the surface strengthening of aviation parts according to claim 2, characterized in that: When the test block connecting plates are connecting plate 1 (7) and connecting plate 2 (12), they can be moved up and down at the same time and fixed by bolts.

4. A strength checking fixture for obtaining shot peening strength in the surface strengthening of aviation parts according to claim 2 or 3, characterized in that: A second positioning through hole (5) is provided between the two horizontal grooves (4) of the base slide rail portion (1).

5. A strength checking fixture for obtaining shot peening strength in surface strengthening of aviation parts according to claim 4, characterized in that: The positioning through hole 1 (3) and the positioning through hole 2 (5) are on a straight line.

6. A strength checking fixture for obtaining shot peening strength in the surface strengthening of aviation parts according to claim 5, characterized in that: The second positioning through hole (5) is located at the center of the width of the base slide rail portion (1).

7. A strength checking fixture for obtaining shot peening strength in surface strengthening of aviation parts according to claim 5, characterized in that: The horizontal groove (4) is a T-shaped groove.

8. The working method of the strength checking fixture for obtaining shot peening strength in the surface strengthening of aviation parts according to claim 1, characterized in that: The steps are: 1) Before use, give the position data of each shot peening intensity check point according to the area position that needs to be verified on the part drawing, including the distance in the X direction and the distance in the Z direction, as well as the angle α between the surface where the check point is located and the X direction; 2) Connect the base slide rail part (1) to the machine tool turntable through the first positioning through hole (3), adjust the distance in the X direction through the horizontal groove (4), connect and fix it to the dovetail groove of the machine tool turntable through the second positioning through hole (5), and ensure that the base slide rail part (1) is firmly installed through the first positioning through hole (3) and the second positioning through hole (5); 3) The lateral edge of the vertical slide rail part (2) is connected to the horizontal groove of the base slide rail part (1) by screws, and the Z-direction position is adjusted by the two vertical grooves of the vertical slide rail part (2); 4) The standard test block is set on the lateral side of the angle rotating plate (10) or the second connecting plate (12), and the ALMEN test piece is installed on the standard test block. The curved test piece is obtained by the shot peening process. The change in the straightness of the standard test block is used to indirectly verify the shot peening strength. The angle α in the X direction is adjusted by the angle rotating plate (10) and the rotating connecting piece (9). The verification range of the angle α is 0-180°; 5) Use the adjusted shot peening intensity calibration device, install the corresponding ALEMN test piece (A or N test piece) on the standard test block, and then compile a program on the shot peening CNC equipment to impact the test piece on the strength calibration surface with a shot flow with pressure and flow parameters to obtain the change value before and after the ALMEN test piece, and obtain the shot peening intensity at a certain calibration position through the saturation curve calculation program.

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