Bowl-shaped pressure diaphragm and manufacturing method thereof

Abstract

The present application provides a bowl-shaped pressure diaphragm and a manufacturing method thereof. The bowl-shaped pressure diaphragm is formed by stamping a flat plate. The material can be stainless steel or elastic alloy. The manufacturing method steps are blanking, cleaning and drying, solution heat treatment, cleaning and drying, forming, cleaning and drying, end face turning, cleaning and drying, quenching, cleaning and drying, tempering, cleaning and drying, hardness and grain size detection. The present invention provides a small-sized, vibration-resistant sensitive element and proposes a specific manufacturing method thereof.

Description

Technical Field

[0001] The present application belongs to the technical field of aviation pressure instruments, and specifically relates to a bowl-shaped pressure diaphragm and a manufacturing method thereof. Background Art

[0002] In the field of aviation pressure instruments, the sensitive elements used in pressure gauges on the market are mostly C-type end-tubes. However, the size of C-type end-tubes is generally large, resulting in a larger volume of the pressure gauge. At the same time, due to the high vibration in the aviation environment, C-type end-tube pressure gauges can no longer meet the requirements.

[0003] Therefore, it is necessary to design a sensitive element with smaller size and better vibration resistance, and to propose a manufacturing method. Summary of the invention

[0004] Purpose of the invention: With the development of the aviation industry, cockpit instruments have developed into integrated instruments. General mechanical pressure gauges are no longer used in the cockpit, but are generally used in the belly and wings of the aircraft. This brings many problems to the pressure gauge. The vibration values ​​of these parts are much greater than those in the cockpit, and the temperature and other environments are also relatively harsh. Therefore, in order to solve the problem of increased vibration values, a bowl-shaped pressure diaphragm and a manufacturing method thereof are provided.

[0005] In a first aspect, the present application provides a method for manufacturing a bowl-shaped pressure diaphragm, the method comprising:

[0006] Cutting the sheet material to obtain a blank, and then cleaning and drying the blank;

[0007] Performing solution heat treatment, cleaning and drying on the blank;

[0008] Performing a stamping process on the blank to obtain an initial bowl-shaped pressure diaphragm, and cleaning and drying the initial bowl-shaped pressure diaphragm;

[0009] Carrying end surface treatment, cleaning and drying the initial bowl-shaped pressure diaphragm;

[0010] The initial bowl-shaped pressure diaphragm is quenched, cleaned and dried;

[0011] Then, the initial bowl-shaped pressure diaphragm is tempered, cleaned and dried to obtain a final bowl-shaped pressure diaphragm;

[0012] The final bowl-shaped pressure diaphragm is tested for hardness and grain size.

[0013] Preferably, the purpose of the solution heat treatment is to reduce the material hardness of the membrane. The specific parameters are a temperature of 980-1000°C, a holding time of 150-180 min, a cooling method of air cooling at 200°C, and a heat treatment furnace vacuum of 1.33×10 -2 Pa.

[0014] Preferably, the purpose of cleaning and drying is to clean the grease on the surface of the material. The specific parameters are cleaning in a cleaning machine for 30-60 minutes, using acetone as the cleaning agent, drying at 200° C., and drying time for 90 minutes.

[0015] Preferably, the purpose of cutting is to cut sheets of different thicknesses into circular shapes according to the pressure felt by the diaphragm.

[0016] Preferably, the purpose of forming is to stamp the circular sheet through a friction press, the forming is achieved through a customized mold, and parameters such as the diaphragm thickness are obtained through calculation and simulation.

[0017] Preferably, the end face is cut by a lathe, and the size is based on design requirements.

[0018] Preferably, the purpose of quenching is to increase the material hardness of the diaphragm, and the specific parameters are temperature 1100-1200° C., holding time 30 minutes, and cooling method oil cooling.

[0019] Preferably, the purpose of tempering is to remove the excess stress of the diaphragm, and the specific parameters are a temperature of 400-450°C, a holding time of 120-150 minutes, and a cooling method of air cooling at 200°C in the furnace.

[0020] 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.

[0021] In a second aspect, the present application further provides a bowl-shaped pressure diaphragm, wherein the bowl-shaped pressure diaphragm is manufactured by the above method;

[0022] Among them, the upper edge of the bowl-shaped pressure diaphragm has a protrusion for welding with the base; the middle part of the bowl-shaped pressure diaphragm is similar to a bowl shape, which is used to sense pressure and output corresponding displacement; there is a stepped hole in the middle of the lower end of the bowl-shaped pressure diaphragm, which is used to install the push rod and weld it to the periphery of the push rod.

[0023] This application has the following technical effects:

[0024] The present invention proposes a new type of pressure sensitive element - a bowl-shaped pressure diaphragm. As mentioned above, due to the increasingly stringent environmental requirements and vibration requirements of aircraft, the currently used C-tube pressure gauge can no longer meet these new requirements. The reason is that the C-tube structure is a cantilever structure. When subjected to a large vibration value, the end of the C-tube will vibrate, resulting in the problem of pressure gauge pointer swinging and parts wear. In order to solve this problem, a pressure gauge with a bowl-shaped pressure diaphragm as the sensitive element is proposed; in addition, the present invention proposes a method for manufacturing a bowl-shaped pressure diaphragm and proposes a practical process method, which has a high practical application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a diagram of the bowl-shaped diaphragm before processing. Figure 1 ;

[0026] Figure 2 This is a diagram of the bowl-shaped diaphragm before processing. Figure 2 ;

[0027] Figure 3 This is a cross-sectional view of the bowl-shaped diaphragm after processing;

[0028] Figure 4 This is a top view of the bowl-shaped diaphragm after processing;

[0029] Figure 5 This is a schematic diagram of the bowl-shaped diaphragm after welding with the base and the top rod;

[0030] Among them, ① base, ② bowl-shaped pressure diaphragm, and ③ top rod. DETAILED DESCRIPTION

[0031] With the development of aviation industry, cockpit instruments have developed into integrated instruments. General mechanical pressure gauges are no longer used in cockpits, but are generally used in aircraft belly and aircraft wings. This brings many problems to the pressure gauges. The vibration values ​​of these parts are much greater than those in the cockpit, and the temperature and other environments are also more severe. Therefore, in order to solve the problem of increased vibration values, a bowl-shaped pressure diaphragm and a manufacturing method thereof are provided.

[0032] The present application provides a bowl-shaped pressure diaphragm and a manufacturing method thereof. The bowl-shaped pressure diaphragm is formed by stamping a flat plate. The material can be stainless steel or elastic alloy. The manufacturing method steps are blanking, cleaning and drying, solution heat treatment, cleaning and drying, forming, cleaning and drying, end face turning, cleaning and drying, quenching, cleaning and drying, tempering, cleaning and drying, hardness and grain size detection. The present invention provides a small-sized, vibration-resistant sensitive element and proposes a specific manufacturing method thereof.

[0033] The present invention proposes a new type of pressure sensitive element - a bowl-shaped pressure diaphragm. As mentioned above, due to the increasingly stringent environmental requirements and vibration requirements of aircraft, the currently used C-tube pressure gauge can no longer meet these new requirements. The reason is that the C-tube structure is a cantilever structure. When subjected to a large vibration value, the end of the C-tube will vibrate, resulting in the problem of pressure gauge pointer swinging and parts wear. In order to solve this problem, a pressure gauge with a bowl-shaped pressure diaphragm as the sensitive element is proposed; in addition, the present invention proposes a method for manufacturing a bowl-shaped pressure diaphragm and proposes a practical process method, which has a high practical application value.

[0034] The following is combined with Figure 1 -Attached Figure 4 The present invention is further described with reference to the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0035] See also Figure 3 to Figure 4 The bowl-shaped membrane schematic diagram shown in FIG. Figure 1 and Figure 2 It is a blank of a bowl-shaped diaphragm, and its material is stainless steel or elastic alloy.

[0036] The specific manufacturing process and method of the bowl-shaped diaphragm are as follows:

[0037] 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.

[0038] The purpose of cutting is to cut sheets of different thicknesses into circular shapes according to the pressure felt by the diaphragm.

[0039] 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.

[0040] Solution heat treatment, the purpose of solution heat treatment is to reduce the material hardness of the diaphragm, which is convenient for subsequent machining. The solution heat treatment uses a vacuum furnace, and the temperature of the vacuum furnace is set at 980-1000℃. Then put the cleaned blanks into the vacuum furnace. Be careful not to stack them together, but spread them out, and then evacuate and keep them warm for 150-180 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.

[0041] Forming,The purpose of forming is to stamp the circular sheet through a friction press. The forming is achieved through a customized mold, and parameters such as the diaphragm thickness are obtained through calculation and simulation.

[0042] End face turning: The end face is cut by a lathe, and the size is based on design requirements.

[0043] 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 at 1100-1200℃. 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.

[0044] Tempering: The purpose of tempering is to remove the excess stress of the diaphragm. Tempering uses a vacuum furnace with a temperature set at 400-450°C. Then put the cleaned blanks into the vacuum furnace. Be careful not to stack them together, but spread them out. Then, vacuumize them and keep them warm for 120-150 minutes. Cool them with the air in the furnace and take out the blanks when the temperature reaches 200°C. The vacuum degree of the heat treatment furnace is 1.33×10 -2 Pa.

[0045] 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.

[0046] In other embodiments of the present application, the present application provides a method for manufacturing a bowl-shaped pressure diaphragm, the method comprising:

[0047] Cutting the sheet material to obtain a blank, and then cleaning and drying the blank;

[0048] Performing solution heat treatment, cleaning and drying on the blank;

[0049] Performing a stamping process on the blank to obtain an initial bowl-shaped pressure diaphragm, and cleaning and drying the initial bowl-shaped pressure diaphragm;

[0050] Carrying end surface treatment, cleaning and drying the initial bowl-shaped pressure diaphragm;

[0051] The initial bowl-shaped pressure diaphragm is quenched, cleaned and dried;

[0052] Then, the initial bowl-shaped pressure diaphragm is tempered, cleaned and dried to obtain a final bowl-shaped pressure diaphragm;

[0053] The final bowl-shaped pressure diaphragm is tested for hardness and grain size.

[0054] In other embodiments of the present application, the present application provides a bowl-shaped pressure diaphragm, and the bowl-shaped pressure diaphragm is manufactured by the above method.

[0055] Among them, the upper edge of the bowl-shaped pressure diaphragm has a protrusion for welding with the base; the middle part of the bowl-shaped pressure diaphragm is similar to a bowl shape, which is used to sense pressure and output corresponding displacement; there is a stepped hole in the middle of the lower end of the bowl-shaped pressure diaphragm, which is used to install the push rod and weld it to the periphery of the push rod.

Claims

1. A method for manufacturing a bowl-shaped 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 a stamping process on the blank to obtain an initial bowl-shaped pressure diaphragm, and cleaning and drying the initial bowl-shaped pressure diaphragm; Carrying end surface treatment, cleaning and drying the initial bowl-shaped pressure diaphragm; The initial bowl-shaped pressure diaphragm is quenched, cleaned and dried; Then, the initial bowl-shaped pressure diaphragm is tempered, cleaned and dried to obtain a final bowl-shaped pressure diaphragm; The final bowl-shaped 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 980-1000℃, holding time 150-180min, 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 in a cleaning machine for 30-60 minutes, using acetone as the cleaning agent, drying at 200°C, and drying time for 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 stamp the circular sheet through a friction press. The forming is achieved through a customized mold, and parameters such as the diaphragm thickness are obtained through calculation and simulation.

6. The method according to claim 1, characterized in that The end face 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 1100-1200℃, 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 400-450℃, 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 bowl-shaped pressure diaphragm, characterized in that: The bowl-shaped pressure diaphragm is manufactured by the method according to any one of claims 1 to 9; Among them, the upper edge of the bowl-shaped pressure diaphragm has a protrusion for welding with the base; the middle part of the bowl-shaped pressure diaphragm is similar to a bowl shape, which is used to sense pressure and output corresponding displacement; there is a stepped hole in the middle of the lower end of the bowl-shaped pressure diaphragm, which is used to install the push rod and weld it to the periphery of the push rod.

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