Manufacturing Quality Detection and Characterization Method for Inlet and Exhaust Holes of Grille Parts

Abstract

The present invention belongs to the field of material processing and manufacturing, and relates to a method for manufacturing quality detection and characterization of intake and exhaust holes of a grille part. The present invention mainly adopts an indirect characterization method. A standard sample piece is installed at the bottom of a special barrel-shaped conformal detection tool filled with a fluid medium, and a certain pressure is applied to the upper surface of the fluid from the top of the container. The fluid medium in the container flows out from the holes, and the flowing fluid will form laminar flow segments of different lengths according to the shape of the intake and exhaust holes and the surface roughness of the inner holes. By respectively measuring the lengths of the laminar flow segments of the media flowing out of the intake and exhaust holes of the part grille and the holes of the standard sample piece and making a comparison, the manufacturing precision of the holes can be characterized, and the manufacturing quality of the grille holes of the part can be indirectly characterized by using the standard piece. The present invention can quantitatively detect the manufacturing quality precision of the intake and exhaust holes of the grille part, and provide technical support for the detection of the hole manufacturing of the part.

Description

Technical Field

[0001] The present invention belongs to the field of material processing and manufacturing, and relates to a method for manufacturing quality detection and characterization of intake and exhaust holes of grille parts. Background Art

[0002] In order to ensure the long-term stable operation of the internal system parts of an aircraft, the aircraft skin access panel parts are often made into a grille type with inclined intake and exhaust holes, which can avoid excessive impurities entering the cavity and affecting the operation stability of the system parts while ensuring sufficient ventilation. At present, there are mainly three manufacturing methods for grille parts. First, after the sheet metal is manufactured as the main body, holes are made by laser or electric discharge machining. This method is generally only applicable to round holes. Second, machining manufacturing, where the grille main body and grille holes are integrally manufactured by a numerically controlled machine tool. The manufacturing efficiency of this method is low and the cycle is long. For hexagonal grille intake and exhaust hole parts with an inclined angle, an additive manufacturing method is often selected to manufacture the grille parts with special-shaped intake and exhaust holes at one time. Due to the fact that the part main body will be repeatedly affected by thermal cycles during the additive manufacturing process and the surface quality is also affected by the size of the powder, the quality control of additive manufacturing grille intake and exhaust holes is relatively complex. However, currently, for the quality detection means such as the dimensional accuracy and hole wall roughness of both simple grille intake and exhaust holes and special-shaped grille intake and exhaust holes, they are still in the blind area of detection means and can only be inspected visually. There is no simple, effective and objective method to reflect the manufacturing accuracy and quality of the intake and exhaust holes, and the overall quality of the parts is often affected by human factors. Therefore, in order to ensure the quality of grille parts and improve the product consistency, a method for detecting and characterizing the system accuracy quality of the intake and exhaust holes of grille hole parts needs to be proposed. Summary of the Invention

[0003] Aiming at the problem that the manufacturing dimensional accuracy and hole wall roughness of the above-mentioned grille intake and exhaust holes can only be detected visually by humans at present and it is difficult to meet the accuracy requirements of the overall quality detection of parts, a method for manufacturing quality detection and characterization of the intake and exhaust holes of grille parts is proposed.

[0004] The present invention mainly adopts an indirect characterization method. A standard part test piece is installed at the bottom of a special-shaped detection tooling filled with a fluid medium, and a certain pressure is applied to the upper surface of the fluid from the top of the container. The fluid medium in the container flows out from the holes under the action of the pressure. The flowing fluid will form laminar flow segments of different lengths according to the shape of the intake and exhaust holes and the surface roughness of the inner hole. By measuring the lengths of the laminar flow segments of the fluid flowing out of the grille intake and exhaust holes of the part and the holes of the standard sample respectively and comparing them, the manufacturing accuracy of the holes can be characterized, and the manufacturing quality of the grille intake and exhaust holes of the part can be indirectly characterized by the standard part.

[0005] The technical solution of the present invention:

[0006] Manufacturing Quality Detection and Characterization Method for Inlet and Outlet Holes of Grille Parts. Design a general detection system composed of a medium control system and a detection tooling. Pre-fabricate a standard part with a reference hole that meets the quality requirements of the grille holes to be processed. Load the selected fluid medium into the special detection tooling that already contains the standard part. Apply pressure above the liquid medium so that the liquid medium flows out of the reference hole of the standard part under the action of pressure. Adjust the pressure value to make the initial section of the liquid medium flowing out of the reference hole in a stable laminar flow state. Record the pressure value when it reaches the laminar flow state and keep the pressure unchanged in the subsequent process. Then, put the grille part into the special detection tooling, add the liquid medium in the same state, apply the same pressure as the recorded pressure value above, and keep the pressure unchanged. Measure the laminar flow length of the liquid flowing out of the grille hole and compare it with the laminar flow length of the standard hole to judge whether the state of the grille hole is consistent with the standard hole.

[0007] Liquid Medium Control System Scheme:

[0008] The described detection medium control system provides appropriate pressure for the medium. Along the entire path of the liquid medium flow, it consists of a liquid medium tank, precision filter A, water suction pump, plunger pump, precision filter B, overflow valve, check valve, accumulator, flow meter, pressure regulating valve, and detection tooling in sequence;

[0009] Among them, the role of precision filter A is to remove solid particles in the flowing liquid medium and ensure the consistency of the viscosity of the liquid medium entering the cavity of the detection tooling. The role of the plunger pump is to increase the liquid medium flowing from the water suction pump and discharge it to the next component. The role of the overflow valve is to protect the liquid medium flow pipeline when the pressure is too high. The role of the check valve is to prevent the liquid medium from flowing back when the pressure in the pipeline changes. The role of the accumulator is to control the pulse frequency of the liquid medium in the pipeline within 8% - 10% when the pipeline is impacted due to the pulsed working mode of the plunger pump, and to ensure the stability of the liquid medium flow at the inlet of the detection tooling. The role of the pressure regulating valve is to ensure the stability of the pressure at the inlet of the detection tooling and that it is the required pressure value through adjustment;

[0010] Technical Scheme of the Detection Tooling:

[0011] The described detection tooling is the end device of the general detection system. The flow mode of the liquid medium is selected in the form of two inlets and one outlet, which improves the overall symmetry and stability of the liquid medium in the tooling. At the same time, the overall inner wall structure of the cavity is a double-layer structure. After guiding the liquid medium to enter the cavity under pressure, it flows in the cavity in the order of down, up, and down, so that the liquid medium directly above the hole of the part to be measured is not directly impacted by the high-pressure liquid medium, and the flow stability of the liquid medium directly above the hole of the part to be detected in the cavity when it is under pressure is improved.

[0012] The described detection tooling is of a symmetric structure and includes a barrel-shaped cavity side wall, a base, a pressing plate, and an upper cover plate; the upper surface of the base is connected to the pressing plate through the part to be detected, and the upper part of the barrel-shaped cavity side wall is connected to the upper cover plate; each part is connected by bolts, and rubber gaskets are installed between the connected structures to seal the high-pressure liquid medium inside the tooling. The manufacturing material of all structures is 3Cr13 high-speed tool steel;

[0013] The described barrel-shaped cavity side wall includes an inner layer and an outer layer of the barrel-shaped cavity side wall. The distance between the two layers is 30 - 60 mm, and the top between the two layers is closed. The bottom of the inner layer of the barrel-shaped cavity side wall is open, and the opening height is 10 - 30 mm. The cavity wall thickness is 5 mm, the inner height of the cavity is 100 - 150 mm. There are 8 M8 threaded holes at the bottom of the barrel-shaped cavity side wall at the bottom of the cavity for connecting to the base by bolts, and 8 M8 threaded holes at the top of the barrel-shaped cavity side wall at the top of the cavity for connecting to the upper cover plate by bolts. There are two symmetric water inlets on the outer wall of the cavity, which serve as the inlets of the liquid medium and are connected to the detection medium control system pipeline;

[0014] The center of the described base is hollow, and there is a flange on the base wall of the hollow part. There are 8 through holes on the bottom surface of the outer side of the base wall for bolt connection with the barrel-shaped cavity. There are 4 through holes on the bottom surface of the inner side of the base wall for bolt connection with the current pressing plate. The inner cavity size of the base is consistent with the outer contour of the part to be detected and the tolerance is -0.3 mm to 0. The thickness of the base wall is 5 mm, and the height of the base wall is greater than the opening height of the bottom of the barrel-shaped cavity by not less than 50 mm;

[0015] The described pressing plate is a flange structure with a hollow interior. The outer dimension is consistent with the cavity size inside the base, and there are 4 M8 threaded holes at the positions corresponding to the 4 through holes on the inner side of the base wall. The thickness of the pressing plate is 5 mm;

[0016] The outer contour dimension of the described upper cover plate is consistent with the outer contour of the barrel-shaped cavity, and there are 8 through holes at the positions corresponding to the bolt holes at the top of the barrel-shaped cavity for bolt connection with the barrel-shaped cavity;

[0017] Standard part manufacturing:

[0018] The described standard part uses a plate with the same thickness as the part to be detected and made of the same series of materials. Using a numerical control machine tool, 10 standard holes are made on the plate in a circular array according to the surface quality and dimensional requirements of the holes of the part to be processed. The outer contour dimension of the standard part is consistent with the outer contour dimension of the grille to be processed;

[0019] The manufacturing quality inspection characterization method of the grille parts intake and exhaust holes is as follows:

[0020] 1. Select a liquid with good fluidity (critical Reynolds number Re>2000) and whose characteristics are not greatly affected by ambient temperature as the medium and put it into the water tank;

[0021] 2. Install the standard parts between the bottom plate of the inspection tooling and the pressure plate. Place a 2mm thick rubber gasket between the standard parts, the bottom plate of the inspection tooling and the pressure plate. Use bolts to connect the tooling bottom plate and the pressure plate to clamp the standard parts.

[0022] 3. Connect the bottom surface of the barrel-shaped cavity side wall and the upper surface of the base flange by bolts, and place a 2mm thick rubber gasket between the two;

[0023] 4. Install the upper cover plate to the top of the barrel-shaped cavity side wall and connect them with bolts, and place a 2mm thick rubber gasket between the two;

[0024] 5. Connect the medium control system to the medium inlet of the detection tooling through a hose;

[0025] 6. Turn on the medium control system and adjust the pressure regulating valve pressure so that the medium fills the test fixture and flows out from the standard hole of the standard part. When the laminar flow length of the medium flowing out of the standard hole is 50 mm, record the pressure value of the pressure regulating valve.

[0026] 7. Close the medium control system, disassemble the upper cover plate, barrel cavity side wall, pressure plate, and remove the standard parts in sequence;

[0027] 8. Clean and inspect the structures of the tooling;

[0028] 9. Install the parts to be tested on the testing tooling according to steps 2 to 5;

[0029] 10. Open the medium control system and adjust the pressure regulating valve to the final pressure value recorded in step 6;

[0030] 11. Detect the laminar flow length of the liquid medium flowing out of the hole of the part to be tested. If the measured laminar flow length is between 45 and 55 mm, it means that the hole of the part to be tested meets the requirements. If the laminar flow length does not meet the range of 45 to 55 mm, it means that the hole of the part to be tested does not meet the requirements. At this point, the detection work is completed;

[0031] 12. Turn off the medium control system, disassemble the inspection tooling according to step 7, and take out the parts to be removed.

[0032] Beneficial effects of the present invention:

[0033] (1) By using the comparison method with the standard parts described in this method, the manufacturing quality accuracy detection of the grille parts' air inlet and outlet holes can be quantified, providing technical support for the manufacturing detection of the parts holes;

[0034] (2) The design of the medium control system can accurately adjust the pressure value of the liquid medium.

[0035] (3) The tooling solution with a double - inlet single - outlet and a double - layer inner wall structure in the tooling cavity can stabilize the pressure value during pressurization above the exhaust hole, avoiding the direct action of the pressurization on the liquid medium in the cavity, which may cause chaotic flow of the liquid medium in the cavity and lead to deviation of the detection results. Brief Description of the Drawings

[0036] Figure 1 Schematic diagram of the liquid medium control system;

[0037] Figure 2 Schematic diagram of the structure of the detection tooling;

[0038] Figure 3 Schematic diagram of the side - wall structure of the barrel - shaped cavity;

[0039] Figure 4 Schematic diagram of the base structure;

[0040] Figure 5 Schematic diagram of the pressing plate;

[0041] Figure 6 Schematic diagram of the upper cover plate;

[0042] In the figure: 1 is the liquid medium tank; 2 is the precision filter A; 3 is the water suction pump; 4 is the precision filter B; 5 is the plunger pump; 6 is the overflow valve; 7 is the check valve; 8 is the accumulator; 9 is the flow meter; 10 is the pressure regulating valve; 11 is the detection tooling; 12 is the part to be detected; 13 is the side - wall of the barrel - shaped cavity; 14 is the base; 15 is the pressing plate; 16 is the upper cover plate; 17 is the inner layer of the side - wall of the barrel - shaped cavity; 18 is the outer layer of the side - wall of the barrel - shaped cavity; 19 is the bottom inner opening; 20 is the threaded hole at the bottom of the side - wall of the barrel - shaped cavity; 21 is the threaded hole at the top of the side - wall of the barrel - shaped cavity; 22 is the water flow inlet; 23 is the central hollow structure of the base; 24 is the base wall; 25 is the through - hole on the outer bottom surface of the base wall; 26 is the through - hole on the inner bottom surface of the base wall; 27 is the inner cavity of the base; 28 is the threaded hole of the pressing plate; 29 is the threaded hole of the upper cover plate. Detailed Embodiments

[0043] The following further describes the present invention in detail with reference to the accompanying drawings, so that those skilled in the art can implement it according to the description in the specification.

[0044] Embodiment 1:

[0045] Liquid medium control system solution:

[0046] The described detection medium control system provides appropriate pressure for the medium. Along the entire path of the liquid medium flow, it consists of a liquid medium tank 1, a precision filter A 2, a water suction pump 3, a plunger pump 5, a precision filter B 4, a relief valve 6, a check valve 7, an accumulator 8, a flow meter 9, a pressure regulating valve 10, and a detection tooling 11 in sequence;

[0047] Among them, the function of the precision filter A 2 is to remove solid particles in the flowing liquid medium and ensure the consistency of the viscosity of the liquid medium entering the cavity of the detection tooling 11. The function of the plunger pump 5 is to increase the liquid medium flowing from the water suction pump 3 and discharge it to the next component. The function of the relief valve 6 is to protect the liquid medium flow pipeline when the pressure is too high. The function of the check valve 7 is to prevent the liquid medium from flowing back when the pressure in the pipeline changes. The function of the accumulator 8 is to control the pulse frequency of the liquid medium in the pipeline within 8% - 10% when the pipeline is impacted due to the pulse working mode of the plunger pump 5, and to ensure the stability of the liquid medium flow at the inlet of the detection tooling 11. The function of the pressure regulating valve 10 is to ensure the stability of the pressure at the inlet of the detection tooling 11 and that it is the required pressure value by adjustment;

[0048] Technical solution of the detection tooling 11:

[0049] The described detection tooling 11 is the end device of a general detection system. The flow mode of the liquid medium is selected in the form of two inlets and one outlet, which improves the overall symmetry and stability of the liquid medium in the tooling. At the same time, the inner structure of the cavity is a double-layer inner wall structure. After the liquid medium enters the cavity under pressure, it flows in the cavity in the order of down, up, and down, so that the liquid medium directly above the hole of the part to be tested is not directly impacted by the high-pressure liquid medium, and the flow stability of the liquid medium directly above the hole of the part 12 to be detected in the cavity is improved when it is under pressure.

[0050] The described detection tooling 11 is a symmetric structure, including a barrel-shaped cavity side wall 13, a base 14, a pressing plate 15, and an upper cover plate 16; The upper surface of the base 14 is connected to the pressing plate 15 through the part 12 to be detected, and the upper part of the barrel-shaped cavity side wall 13 is connected to the upper cover plate 16; Each part is connected by bolts, and rubber gaskets are installed between the connected structures to seal the high-pressure liquid medium inside the tooling. The manufacturing material of all structures is selected as 3Cr13 high-speed tool steel;

[0051] The side wall 13 of the barrel-shaped cavity includes an inner layer 17 and an outer layer 18 of the side wall of the barrel-shaped cavity. The distance between the two layers is 30-60 mm, and the top between the two layers is closed. The bottom of the inner layer 17 of the side wall of the barrel-shaped cavity has an opening 19 with a height of 10-30 mm. The wall thickness of the cavity is 5 mm, the inner height of the cavity is 100-150 mm, and the bottom of the cavity is provided with 8 M8 threaded holes 20 at the bottom of the side wall of the barrel-shaped cavity for bolt connection with the base 14. The top of the cavity is provided with 8 M8 threaded holes 21 at the top of the side wall of the barrel-shaped cavity for bolt connection with the upper cover plate 16. Two symmetrical water flow inlets 22 are provided on the outer wall of the cavity, which are connected to the detection medium control system pipeline as the inlets of the liquid medium;

[0052] The center of the base 14 is hollowed out, and the hollow part has a flange on the wall of the base 14. 8 bottom through holes 25 on the outer bottom surface of the base wall are provided for bolt connection with the barrel-shaped cavity. 4 bottom through holes 26 on the inner bottom surface of the base wall are provided for bolt connection with the current pressing plate 15. The inner cavity size of the base 14 is consistent with the outer contour of the part 12 to be detected, and the tolerance is -0.3 mm to 0. The thickness of the base wall 24 is 5 mm, and the height of the base wall 24 is greater than the opening height of the bottom of the barrel-shaped cavity by not less than 50 mm;

[0053] The pressing plate 15 is a flange structure with a hollow interior. The outer dimension is consistent with the inner cavity size of the base 14, and 4 M8 threaded holes are provided at positions corresponding to the 4 through holes on the inner side of the base wall 14. The thickness of the pressing plate 15 is 5 mm;

[0054] The outer contour dimension of the upper cover plate 16 is consistent with the outer contour of the barrel-shaped cavity, and 8 through holes are provided at positions corresponding to the bolt holes at the top of the barrel-shaped cavity for bolt connection with the barrel-shaped cavity;

[0055] Standard part manufacturing:

[0056] The standard part uses a plate with the same thickness as the part 12 to be detected and made of the same series of materials. 10 standard holes are made on the plate in a circular array according to the surface quality and dimensional requirements of the holes of the part to be processed. The outer contour dimension of the standard part is consistent with the outer contour dimension of the grille to be processed;

[0057] Example 2:

[0058] A method for detecting and characterizing the manufacturing quality of the intake and exhaust holes of a grille part is as follows:

[0059] 1. Select a liquid with good fluidity and little influence on its own characteristics by environmental temperature as the medium and put it into the water tank;

[0060] 2. Install the standard part between the bottom plate of the inspection tooling 11 and the pressing plate 15. Place a 2-mm-thick rubber washer between the standard part, the bottom plate of the inspection tooling 11, and the pressing plate 15. Connect the tooling bottom plate and the pressing plate 15 with bolts to clamp the standard part tightly.

[0061] 3. Connect and fit the bottom surface of the side wall 13 of the barrel-shaped cavity and the upper surface of the flange of the base 14 with bolts. Place a 2-mm-thick rubber washer between them.

[0062] 4. Install the upper cover plate 16 to the top of the side wall 13 of the barrel-shaped cavity by bolt connection and fit them together. Place a 2-mm-thick rubber washer between them.

[0063] 5. Connect the medium control system and the medium inlet of the inspection tooling 11 with a hose.

[0064] 6. Turn on the medium control system. Adjust the pressure of the pressure regulating valve 10 so that the medium fills the inspection tooling 11 and flows out from the standard hole of the standard part. When the laminar flow length of the medium flowing out from the standard hole is 50 mm, record the pressure value of the pressure regulating valve 10.

[0065] 7. Turn off the medium control system. Remove the upper cover plate 16, the side wall 13 of the barrel-shaped cavity, the pressing plate 15, and take out the standard part in sequence.

[0066] 8. Clean each structure of the inspection tooling 11.

[0067] 9. Install the part to be inspected 12 on the inspection tooling 11 according to the operation steps 2 to 5.

[0068] 10. Turn on the medium control system and adjust the pressure regulating valve 10 to the final pressure value recorded in step 6.

[0069] 11. Detect the laminar flow length of the liquid medium flowing out from the hole of the part to be inspected 12. If the measured laminar flow length is between 45 and 55 mm, it indicates that the hole of the part to be inspected 12 meets the requirements. If the laminar flow length does not meet the range of 45 to 55 mm, it indicates that the hole of the part to be inspected 12 does not meet the requirements. Thus, the inspection work is completed. 12. Turn off the medium control system. Disassemble the inspection tooling 11 according to step 7 and take out the part to be inspected.

Claims

1. Manufacturing quality inspection and characterization method of grille parts intake and exhaust holes, It is characterized in that Here are the steps: The first step is to design a universal detection system consisting of a medium control system and a detection tool (11), and prefabricate a standard part with a reference hole; The medium control system provides appropriate pressure for the medium, and is connected in sequence along the entire flow path of the liquid medium by a liquid medium tank (1), a precision filter A (2), a water suction pump (3), a plunger pump (5), a precision filter B (4), a relief valve (6), a check valve (7), an accumulator (8), a flow meter (9), a pressure regulating valve (10), and a detection tool (11); Step 2: Select a liquid with a critical Reynolds number of fluidity Re>2000 and whose characteristics are stable under the influence of ambient temperature as the medium and put it into the water tank; Step 3: Install the standard part between the bottom plate of the testing tool (11) and the pressure plate (15), place a rubber gasket between the standard part and the bottom plate of the testing tool (11) and the pressure plate (15), and use bolts to connect the tool bottom plate and the pressure plate (15) to clamp the standard part; Step 4: Connect the bottom surface of the barrel-shaped cavity side wall (13) and the upper surface of the flange of the base (14) by bolts, and place a rubber gasket between them; Step 5: Install the upper cover plate (16) to the top of the barrel-shaped cavity side wall (13) by bolting and fitting them together, and place a rubber gasket between the two; Step 6: Connect the medium control system to the medium inlet of the detection tool (11) through a hose; Step 7: Start the medium control system and adjust the pressure of the pressure regulating valve (10) so that the medium fills the detection tooling (11) and flows out from the standard hole of the standard part. When the laminar flow length of the medium flowing out of the standard hole is 50 mm, record the pressure value of the pressure regulating valve (10); Step 8: Close the medium control system, disassemble the upper cover plate (16), the barrel-shaped cavity side wall (13), the pressure plate (15), and remove the standard parts in sequence; Step 9: Clean the various structures of the inspection tooling (11); Step 10: Install the part to be inspected (12) onto the inspection tooling (11) according to steps 3 to 6; Step 11: Open the medium control system and adjust the pressure regulating valve (10) to the final pressure value recorded in step 7; Step 12: Detect the laminar flow length of the liquid medium flowing out of the hole of the part to be detected (12). If the measured laminar flow length is between 45 and 55 mm, it indicates that the hole of the part to be detected (12) meets the requirements. If the laminar flow length does not meet the range of 45 to 55 mm, it indicates that the hole of the part to be detected (12) does not meet the requirements. At this point, the detection work is completed. Step 13: Turn off the medium control system, disassemble the inspection tooling (11) according to step 8, and take out the parts to be inspected.

2. The manufacturing quality detection and characterization method of the grille component air inlet and outlet holes according to claim 1, It is characterized in that The detection tool (11) is a symmetrical structure, comprising a barrel-shaped cavity side wall (13), a base (14), a pressure plate (15), and an upper cover plate (16); the upper surface of the base (14) is connected to the pressure plate (15) through the part to be detected (12), and the upper part of the barrel-shaped cavity side wall (13) is connected to the upper cover plate (16); The side wall (13) of the barrel-shaped cavity includes an inner layer (17) and an outer layer (18) of the side wall of the barrel-shaped cavity. The distance between the two layers is 30 to 60 mm, and the top between the two layers is closed. The bottom of the inner layer (17) of the side wall of the barrel-shaped cavity has an opening (19) with a height of 10 to 30 mm. The wall thickness of the cavity is 5 mm, and the inner height of the cavity is 100 to 150 mm. There are 8 M8 threaded holes (20) at the bottom of the side wall of the barrel-shaped cavity on the bottom of the cavity for bolt connection with the base (14). There are 8 M8 threaded holes (21) at the top of the side wall of the barrel-shaped cavity on the top of the cavity for bolt connection with the upper cover plate (16). There are two symmetrical water inlets (22) on the outer wall of the cavity, which are connected to the pipeline of the detection medium control system as the inlets of the liquid medium.

3. The manufacturing quality inspection and characterization method for the air inlet and outlet holes of the grille part as claimed in claim 1 or 2, characterized in that, The center of the base (14) is hollowed out, and the hollowed-out part has a flange on the wall of the base (14). There are 8 through holes (25) on the bottom surface of the outer side of the base wall for bolt connection with the barrel-shaped cavity. There are 4 through holes (26) on the bottom surface of the inner side of the base wall for bolt connection with the existing pressing plate (15). The inner cavity size of the base (14) is consistent with the outer contour of the part to be detected (12) and the tolerance is -0.3 mm to 0. The thickness of the base wall (24) is 5 mm, and the height of the base wall (24) is greater than the opening height of the barrel-shaped cavity part by not less than 50 mm.

4. The manufacturing quality inspection and characterization method for the air inlet and outlet holes of the grille part as claimed in claim 1 or 2, characterized in that, The pressing plate (15) is a flange structure with a hollow interior, and its external dimensions are the same as the cavity dimensions inside the base (14). Four M8 threaded holes are made at positions corresponding to the four through holes on the inner side of the wall of the base (14), and the thickness of the pressing plate (15) is 5 mm.

5. The manufacturing quality inspection and characterization method for the air inlet and outlet holes of the grille part as claimed in claim 3, characterized in that, The pressing plate (15) is a flange structure with a hollow interior, and its external dimensions are the same as the cavity dimensions inside the base (14). Four M8 threaded holes are made at positions corresponding to the four through holes on the inner side of the wall of the base (14), and the thickness of the pressing plate (15) is 5 mm.

6. The manufacturing quality inspection and characterization method for the air inlet and outlet holes of the grille part as claimed in claim 1 or 2 or 5, characterized in that, The outer contour dimensions of the upper cover plate (16) are the same as those of the barrel-shaped cavity, and eight through holes are provided at positions corresponding to the bolt holes at the top of the barrel-shaped cavity for bolt connection with the barrel-shaped cavity.

7. The manufacturing quality inspection and characterization method for the air inlet and outlet holes of the grille part as claimed in claim 3, characterized in that, The outer contour dimensions of the upper cover plate (16) are the same as those of the barrel-shaped cavity, and eight through holes are provided at positions corresponding to the bolt holes at the top of the barrel-shaped cavity for bolt connection with the barrel-shaped cavity.

8. The manufacturing quality inspection and characterization method for the air inlet and outlet holes of the grille part as claimed in claim 4, characterized in that, The outer contour dimensions of the upper cover plate (16) are consistent with those of the barrel-shaped cavity, and eight through holes are provided at positions corresponding to the bolt holes at the top of the barrel-shaped cavity for bolt connection with the barrel-shaped cavity.

9. The manufacturing quality inspection and characterization method for the air inlet and outlet holes of the grille part as claimed in claim 1 or 2 or 5 or 7 or 8, characterized in that, The standard part is made of a plate with the same thickness as the part to be detected (12) and made of the same series of materials. Ten standard holes are made on the plate in a circular array according to the surface quality and dimensional requirements of the holes of the part to be machined, and the external contour dimensions of the standard part are the same as the external contour dimensions of the grille to be machined.

10. The manufacturing quality inspection and characterization method for the air inlet and outlet holes of the grille part as claimed in claim 2, characterized in that, The standard part is made of a plate with the same thickness as the part to be detected (12) and made of the same series of materials. Ten standard holes are made on the plate in a circular array according to the surface quality and dimensional requirements of the holes of the part to be machined, and the external contour dimensions of the standard part are the same as the external contour dimensions of the grille to be machined.

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