Corrugated pressure diaphragm and manufacturing method thereof

Abstract

The invention provides a corrugated pressure diaphragm and a manufacturing method thereof.The corrugated pressure diaphragm is formed by a flat plate in a hydraulic mode, stainless steel or elastic alloy can be selected as a material, and the manufacturing method comprises the steps of solid solution heat treatment, cleaning and drying, blanking, cleaning and drying, forming, cleaning and drying, outer circle turning, cleaning and drying, quenching, cleaning and drying, tempering and cleaning and drying. And detecting hardness and grain size. The invention provides a sensitive element which is small in size and resistant to vibration, and meanwhile provides a specific manufacturing method of the sensitive element.

Description

Technical Field

[0001] The present application belongs to the technical field of aviation pressure instruments, and in particular relates to a corrugated pressure diaphragm and a manufacturing method thereof. Background Art

[0002] In the field of aviation pressure instruments, the sensitive elements used in pressure switches are mostly C-type end-tubes, but the size of C-type end-tubes is generally large, resulting in a large volume of pressure switches. At the same time, due to the large vibration in the use environment in the aviation field, C-type end-tube pressure instruments can no longer meet the requirements. Therefore, it is necessary to design a sensitive element with a smaller size and vibration resistance, and propose a manufacturing method. Summary of the invention

[0003] Purpose of the invention: With the development of the aviation industry, new requirements for pressure switch products are put forward for small size and high vibration environment. The sensitive element used in the current pressure switch - the C-type tube is large in size, resulting in a correspondingly large size of the pressure switch. At the same time, because the structure of the C-type tube in the pressure switch is a cantilever structure, it will vibrate during the large value vibration process, causing the pressure switch to be intermittent at the switch point, resulting in a fault of the pressure alarm value exceeding the tolerance. Therefore, the pressure switch with the C-type tube structure can no longer meet the new environmental requirements, so it is necessary to design a sensitive element to meet the requirements of small size and high vibration, and thus a corrugated pressure diaphragm and a manufacturing method thereof are provided.

[0004] In a first aspect, the present application provides a method for manufacturing a corrugated pressure diaphragm, the method comprising:

[0005] Cutting the sheet material to obtain a blank, and then cleaning and drying the blank;

[0006] Performing solution heat treatment, cleaning and drying on the blank;

[0007] Performing hydraulic forming on the blank to obtain an initial corrugated pressure diaphragm, and cleaning and drying the initial corrugated pressure diaphragm;

[0008] The initial corrugated pressure diaphragm is subjected to outer rounding treatment and cleaned and dried;

[0009] The initial corrugated pressure diaphragm is quenched, cleaned and dried;

[0010] Then, the initial corrugated pressure diaphragm is tempered, cleaned and dried to obtain a final corrugated pressure diaphragm;

[0011] The final corrugated pressure diaphragm is tested for hardness and grain size.

[0012] Preferably, the purpose of the solution heat treatment is to reduce the material hardness of the membrane. The specific parameters are temperature 900-950°C, holding time 120-150min, cooling method 200°C air cooling, heat treatment furnace vacuum 1.33×10 -2 Pa.

[0013] Preferably, the purpose of cleaning and drying is to clean the grease on the surface of the material, and the specific parameters are cleaning for 30-60 minutes, using acetone as the cleaning agent, drying at 200° C., and drying time for 90 minutes.

[0014] Preferably, the purpose of cutting is to cut sheets of different thicknesses into circular shapes according to the pressure felt by the diaphragm.

[0015] Preferably, the purpose of forming is to corrugate the circular sheet material through a hydraulic press, the corrugation forming is achieved through a customized mold, and the corrugation shape and parameters are obtained through calculation and simulation.

[0016] Preferably, the outer circle is cut by a lathe, and the size is based on the design requirements.

[0017] Preferably, the purpose of quenching is to increase the material hardness of the diaphragm, and the specific parameters are temperature 800-1000° C., holding time 30 minutes, and cooling method oil cooling.

[0018] Preferably, the purpose of tempering is to remove the excess stress of the diaphragm, and the specific parameters are a temperature of 500-600°C, a holding time of 120-150 minutes, and a cooling method of air cooling at 200°C in the furnace.

[0019] Preferably, the purpose of hardness and grain size testing is to check whether the hardness and grain size of the diaphragm material meet the design requirements. The specific parameters are that the hardness is not less than HV400 and the grain size is not less than grade 7.

[0020] In a second aspect, the present application also provides a corrugated pressure diaphragm, which is manufactured by the method described above; the material of the corrugated pressure diaphragm is selected from stainless steel or elastic alloy.

[0021] This application has the following technical effects:

[0022] The present invention proposes a new type of pressure sensitive element - a corrugated diaphragm. As mentioned above, the environmental requirements for aircraft are becoming increasingly stringent, the vibration requirements are also stringent, and the size and volume are required to be small. The currently used C-tube pressure switch can no longer meet these new requirements. In order to solve the vibration environment and size problems, a pressure switch with a corrugated diaphragm as a sensitive element is proposed, which can withstand larger vibration values ​​and has a reduced size. In addition, the present invention proposes a method for manufacturing a corrugated diaphragm and a practical process method, which has a high practical application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is an axonometric diagram of a corrugated pressure diaphragm provided in an embodiment of the present application;

[0024] Figure 2 is a front view of a corrugated pressure diaphragm provided in an embodiment of the present application;

[0025] Figure 3 is a top view of the corrugated pressure diaphragm provided in an embodiment of the present application;

[0026] Figure 4 It is a schematic diagram of the structure of the blank provided in the embodiment of the present application. DETAILED DESCRIPTION

[0027] The present application provides a corrugated pressure diaphragm and a manufacturing method thereof. The corrugated pressure diaphragm is hydraulically formed from a flat plate. The material can be stainless steel or an elastic alloy. The manufacturing method steps are respectively solution heat treatment, cleaning and drying, blanking, cleaning and drying, forming, cleaning and drying, turning the outer circle, cleaning and drying, quenching, cleaning and drying, tempering, cleaning and drying, and hardness and grain size detection. The present invention provides a small-sized, vibration-resistant sensitive element, and also proposes a specific manufacturing method thereof.

[0028] The present invention proposes a new type of pressure sensitive element - a corrugated diaphragm. As mentioned above, the environmental requirements for aircraft are becoming increasingly stringent, the vibration requirements are also stringent, and the size and volume are required to be small. The currently used C-tube pressure switch can no longer meet these new requirements. In order to solve the vibration environment and size problems, a pressure switch with a corrugated diaphragm as a sensitive element is proposed, which can withstand larger vibration values ​​and has a reduced size. In addition, the present invention proposes a method for manufacturing a corrugated diaphragm and a practical process method, which has a high practical application value.

[0029] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0030] See also Figures 1 to 3 The present invention is a schematic diagram of a corrugated diaphragm shown in FIG. Figure 4 It is the blank of the corrugated diaphragm, and its material is stainless steel or elastic alloy.

[0031] The specific manufacturing process and method of the corrugated pressure diaphragm are as follows:

[0032] Manufacturing process: cutting, cleaning and drying, solution heat treatment, cleaning and drying, forming, cleaning and drying, turning the outer circle, cleaning and drying, quenching, cleaning and drying, tempering, cleaning and drying, hardness and grain size testing.

[0033] The purpose of cutting is to cut sheets of different thicknesses into round shapes to obtain blanks according to the pressure felt by the diaphragm.

[0034] Cleaning and drying: The purpose of cleaning and drying is to clean the grease on the surface of the blank. The specific parameters are cleaning for 30-60 minutes, acetone as the cleaning agent, drying temperature of 200°C, and time of 90 minutes.

[0035] Solution heat treatment, the purpose of solution heat treatment is to reduce the hardness of the material and facilitate subsequent machining. Solution heat treatment uses a vacuum furnace, the temperature of the vacuum furnace is set at 900-950℃, and then the cleaned blanks are placed in the vacuum furnace. Be careful not to stack them together, they should be spread out, and then vacuumed and kept warm for 120-150min. The cooling method is to open the furnace and take out the blanks when the furnace is air-cooled to 200℃. The vacuum degree of the heat treatment furnace is 1.33×10 -2 Pa.

[0036] Forming: The purpose of forming is to corrugate the circular sheet through a hydraulic press. The corrugation forming is achieved through a customized mold, and the corrugation shape and parameters are obtained through calculation and simulation.

[0037] Turning the outer circle: The outer circle is turned by a lathe to perform outer circle surface cutting, and the size is based on the design requirements to obtain the initial corrugated pressure diaphragm.

[0038] Quenching: The purpose of quenching is to improve the material hardness of the diaphragm. The quenching is done in a vacuum oil-catalyzed furnace, and the temperature of the oil quenching furnace is set to 800-1000℃. Then put the cleaned blanks into the vacuum furnace. Be careful not to stack them together, but spread them out. After 30 minutes of heat preservation, oil cooling is performed.

[0039] Tempering, the purpose of tempering is to remove the excess stress of the diaphragm. Tempering uses a vacuum furnace, the temperature of the vacuum furnace is set at 500-600℃, and then the cleaned blanks are placed in the vacuum furnace. Be careful not to stack them together, they should be spread out, and then vacuumed and kept warm for 120-150 minutes. The cooling method is to open the furnace and take out the blanks when the furnace is cooled to 200℃. The vacuum degree of the heat treatment furnace is 1.33×10 -2 Pa.

[0040] Hardness and grain size testing: The purpose of hardness and grain size testing is to check whether the hardness and grain size of the diaphragm material meet the design requirements. The specific parameters are that the hardness is not less than HV400 and the grain size is not less than level 7.

[0041] The present invention proposes a new type of pressure sensitive element - a corrugated diaphragm. As mentioned above, the environmental requirements for aircraft are becoming increasingly stringent, the vibration requirements are also stringent, and the size and volume are required to be small. The currently used C-tube pressure switch can no longer meet these new requirements. In order to solve the vibration environment and size problems, a pressure switch with a corrugated diaphragm as a sensitive element is proposed, which can withstand larger vibration values ​​and has a reduced size. In addition, the present invention proposes a method for manufacturing a corrugated diaphragm and a practical process method, which has a high practical application value.

[0042] In other embodiments of the present application, the present application provides a method for manufacturing a corrugated pressure diaphragm, the method comprising:

[0043] Cutting the sheet material to obtain a blank, and then cleaning and drying the blank;

[0044] Performing solution heat treatment, cleaning and drying on the blank;

[0045] Performing hydraulic forming on the blank to obtain an initial corrugated pressure diaphragm, and cleaning and drying the initial corrugated pressure diaphragm;

[0046] The initial corrugated pressure diaphragm is subjected to outer rounding treatment and cleaned and dried;

[0047] The initial corrugated pressure diaphragm is quenched, cleaned and dried;

[0048] Then, the initial corrugated pressure diaphragm is tempered, cleaned and dried to obtain a final corrugated pressure diaphragm;

[0049] The final corrugated pressure diaphragm is tested for hardness and grain size.

Claims

1. A method for manufacturing a corrugated pressure diaphragm, characterized in that: The method comprises: Cutting the sheet material to obtain a blank, and then cleaning and drying the blank; Performing solution heat treatment, cleaning and drying on the blank; Performing hydraulic forming on the blank to obtain an initial corrugated pressure diaphragm, and cleaning and drying the initial corrugated pressure diaphragm; The initial corrugated pressure diaphragm is subjected to outer rounding treatment and cleaned and dried; The initial corrugated pressure diaphragm is quenched, cleaned and dried; Then, the initial corrugated pressure diaphragm is tempered, cleaned and dried to obtain a final corrugated pressure diaphragm; The final corrugated pressure diaphragm is tested for hardness and grain size.

2. The method according to claim 1, characterized in that The purpose of solution heat treatment is to reduce the material hardness of the diaphragm. The specific parameters are temperature 900-950℃, holding time 120-150min, cooling method 200℃ air cooling, heat treatment furnace vacuum 1.33×10 -2 Pa.

3. The method according to claim 1, characterized in that The purpose of cleaning and drying is to clean the grease on the surface of the material. The specific parameters are cleaning for 30-60 minutes, acetone as the cleaning agent, drying temperature of 200°C, and time of 90 minutes.

4. The method according to claim 1, characterized in that: The purpose of cutting is to cut sheets of different thicknesses into circular shapes according to the pressure felt by the diaphragm.

5. The method according to claim 1, characterized in that The purpose of forming is to corrugate the circular sheet through a hydraulic press. The corrugation forming is achieved through a customized mold, and the corrugation shape and parameters are obtained through calculation and simulation.

6. The method according to claim 1, characterized in that The outer circle is cut by lathe, and the size is based on the design requirements.

7. The method according to claim 1, characterized in that The purpose of quenching is to increase the material hardness of the diaphragm. The specific parameters are temperature 800-1000℃, holding time 30min, and cooling method oil cooling.

8. The method according to claim 1, characterized in that The purpose of tempering is to remove the excess stress of the diaphragm. The specific parameters are temperature 500-600℃, holding time 120-150min, and cooling method is air cooling at 200℃ in the furnace.

9. The method according to claim 1, characterized in that: The purpose of hardness and grain size testing is to check whether the hardness and grain size of the diaphragm material meet the design requirements. The specific parameters are that the hardness is not less than HV400 and the grain size is not less than level 7.

10. A corrugated pressure diaphragm, characterized in that: The corrugated pressure diaphragm is manufactured by the method described in any one of claims 1 to 9; the material of the corrugated pressure diaphragm is selected from stainless steel or elastic alloy.

Images