Method for processing high-temperature gas-tight one-way valve

Abstract

The application relates to a processing method of a high-temperature gas-tight one-way valve, which comprises the steps of part processing, cleaning, pretreatment, rough grinding, fine grinding, semi-assembly, drilling, counter grinding and assembly. The application realizes quick and accurate positioning when a composite material forming mold frame and a mold plate combination blank is processed, manual repairing and polishing are not needed after the processing is completed, and product quality and production efficiency are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aviation assembly, and particularly provides a processing method of high-temperature air-tight one-way valve. BACKGROUND

[0002] The high-temperature air-tight one-way valve is used for ensuring one-way flow of air when the air from the engine compressor is introduced into the ventilation and heating system. The one-way valve is of a metal end face self-sealing structure, and the surface roughness of the sealing surface needs to reach Ra0.32 and Ra0.2. Moreover, a torque of 157 N.M is applied to the sealing member to cause a certain deformation and improve the sealing difficulty. In addition, the sealing surface, the self-sealing structure, the torque application and the high-temperature deformation make the assembly difficult to assemble, and it is still difficult to guarantee the high-temperature sealing property after repeated debugging. Therefore, the assembly efficiency is very low and the assembly cycle is long. SUMMARY

[0003] The present application aims to provide a processing method of high-temperature air-tight one-way valve, which overcomes the problem that the conventional processing method cannot guarantee the high-temperature air-tightness.

[0004] The technical scheme of the present application is as follows.

[0005] The present application provides a processing method of high-temperature air-tight one-way valve, which comprises a valve sleeve, a pin, a through-end shell, a sealing ring, a spring, a valve core and a cut-off end shell. The through-end shell and the cut-off end shell are threadedly fixedly connected to form an internal hollow structure, and the through-end shell is formed with an inlet channel. The cut-off end shell is provided with an outlet. The valve sleeve, the pin, the spring and the valve core are located in the hollow structure. The valve sleeve is fixed to the inlet channel port through the pin. The valve core is in sliding fit with the valve sleeve. The spring is arranged between the valve sleeve and the valve core. The valve core is closed to the inlet channel under the action of the spring, so that the liquid cannot flow from the outlet channel to the inlet channel. The sealing ring is arranged between the through-end shell and the cut-off end shell.

[0006] The method comprises the following steps.

[0007] Step one: machining the valve sleeve, the pin, the through-end shell, the sealing ring, the spring, the valve core and the cut-off end shell respectively.

[0008] Step two: cleaning the valve sleeve, the pin, the through-end shell, the sealing ring, the spring, the valve core and the cut-off end shell by aviation gasoline, and blowing clean with compressed air.

[0009] Step three: pre-treatment, i.e. heating the valve core, the through-end shell and the cut-off end shell to high temperature of 280℃ and keeping warm for 2h. During the period, the through-end shell and the cut-off end shell are kept in fixed connection, and a torque of 157 N.M is applied. In this way, the deformation of the sealing member of the assembled one-way valve assembly caused by the high temperature of 280℃ and the torque application can be reduced or eliminated.

[0010] Step four: rough grinding of the spool and the corresponding mating sealing plane of the port;

[0011] Step five: assembly of the spring, spool and valve sleeve, and then thread connection or sleeve connection of the valve sleeve with the port, and pressing of the spool against the port by the spring;

[0012] Step six: through drilling on the assembled valve sleeve and inlet channel, and processing of the drilled hole into a tapered hole. Electrical spark drilling can be used before pretreatment to avoid improvement of the hardness of the part after high-temperature heating and failure of drilling. If the steel and the aluminum are one, the drilling can be performed by a bench drill;

[0013] Step seven: pairing of the pin and the tapered hole until there is at least one continuous and complete grinding mark on the tapered surface of the pin;

[0014] Step eight: pressing of the paired pin into the tapered pin hole, thread connection of the on-off end shell and the on-off end shell, and application of a high-temperature sealing glue and a tightening torque.

[0015] Further, the spool is made of stainless steel.

[0016] Further, the on-off end shell and the on-off end shell are made of aluminum or stainless steel.

[0017] Further, in step one, the sealing surface of the spool, the on-off end shell and the on-off end shell can be ground flat to ensure a surface roughness of Ra0.4.

[0018] Further, the sliding fitting part of the spool and the valve sleeve adopts a processing method of rough turning first and then fine turning to improve the straightness of the shaft.

[0019] Further, the surface of the pin is polished by sandpaper after turning to achieve a surface roughness of Ra1.6. The sealing surface is strictly protected against scratching during the processing turnaround.

[0020] Further, 10 white corundum powder is selected for rough grinding, the surface roughness Ra value is not greater than 0.8 μm, the flatness is not greater than 0.01 mm, the rough grinding platform has a grinding speed of 50-60 times / min and an O-shaped movement mode. It is best to continuously change the position and direction for grinding. The grinding time of the spool sealing plane is 2.5-3 h, and the grinding time of the port sealing plane is 1.5-2 h. Until there is no visible scratch in the room after the grinding surface is washed and dried.

[0021] The advantage of the present application is that the present application overcomes the problem that the traditional process cannot guarantee the high-temperature gas tightness requirement. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic diagram of a high-temperature gas seal one-way valve;

[0023] Wherein: 1 - valve sleeve; 2 - limit pin; 3 - on-end housing; 4 - sealing glue; 5 - spring; 6 - valve core; 7 - off-end housing. DETAILED DESCRIPTION

[0024] The disclosed examples will be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all, of the disclosed examples are shown. Indeed, these examples can be described and should be viewed in the context of various possible scenarios. The examples described herein should not be construed as limiting upon the scope of the disclosure.

[0025] The processing method of high-temperature gas-tight one-way valve, the one-way valve includes valve sleeve, pin, on-end housing, sealing glue, spring, valve core and off-end housing; the on-end housing and the off-end housing are threadedly fixedly connected to form an internal hollow structure, and the on-end housing is formed with an inlet passage, the off-end housing has an outlet, the valve sleeve, the pin, the spring and the valve core are located in the hollow structure, the valve sleeve is fixed to the inlet passage port through the pin, and the valve core is in sliding fit with the valve sleeve, the spring is arranged between the valve sleeve and the valve core, the valve core is closed under the action of the spring to make the liquid unable to flow from the outlet passage inlet passage; the sealing glue is arranged between the on-end housing and the off-end housing;

[0026] The processing method comprises the following steps:

[0027] Step one: process the valve sleeve, the pin, the on-end housing, the sealing ring, the spring, the valve core and the off-end housing respectively;

[0028] Step two: clean the valve sleeve, the pin, the on-end housing, the sealing ring, the spring, the valve core and the off-end housing by aviation gasoline, and blow clean with compressed air;

[0029] Step three: pre-treat the valve core, the on-end housing and the off-end housing by heating to high temperature 280 DEG C, and keep warm for 2h, during which the on-end housing and the off-end housing are kept connected and fixed, and a force moment of 157 N.M is applied; in this way, the deformation of the sealing member of the assembled one-way valve assembly caused by high temperature 280 DEG C and the force moment can be reduced or eliminated;

[0030] Step four: coarsely grind the corresponding fit sealing planes of the valve core and the port;

[0031] Step five: assemble the spring, the valve core and the valve sleeve, then threadedly connect or sleeve-connect the valve sleeve with the port, and press the valve core against the port by the spring;

[0032] Step six: drill through the valve sleeve and the inlet channel, and process the drill hole into a tapered hole. The electric spark drilling can be used before pretreatment to avoid the improvement of the hardness of the part after high temperature heating, which cannot be drilled. If the steel and the aluminum are combined, the lathe drill can be used to drill in the present step;

[0033] Step seven: grind the pin and the tapered hole until there is at least one continuous and complete grinding mark on the tapered surface of the pin.

[0034] Step eight: press the ground pin into the tapered pin hole, threadedly connect the on-end housing and the off-end housing, and apply the tightening torque after coating with high temperature sealing glue.

[0035] The valve core is made of stainless steel.

[0036] The on-end housing and the off-end housing are made of aluminum or stainless steel.

[0037] In step one, the sealing surface of the valve core, the on-end housing and the off-end housing can be ground flat to ensure the surface roughness of Ra0.4.

[0038] The sliding fit part of the valve core and the valve sleeve adopts the processing method of rough turning first and then fine turning to improve the straightness of the shaft.

[0039] The surface of the pin is polished by sandpaper after turning, and the surface roughness reaches Ra1.6. The sealing surface is strictly protected from scratches during the processing and turnover process.

[0040] The coarse grinding is selected by adjusting the 10# white corundum powder, the surface roughness Ra value is not greater than 0.8μm, the flatness is not greater than 0.01mm, the coarse grinding platform is ground at a speed of 50-60 times / min in the O-shaped motion mode. It is best to continuously change the position and direction for grinding. The grinding time of the valve core sealing plane is 2.5-3h, and the grinding time of the port sealing plane is 1.5-2h. Until there is no visible scratch in the room after the grinding surface is washed and dried.

[0041] The description of different advantageous arrangements has been presented for purposes of illustration and description, but is not intended to be exclusive or exhaustive. Many modifications and variations will be apparent to those of ordinary skill in the art. Additionally, different advantageous examples can provide different advantages as compared to other advantageous examples. The chosen examples are described to best explain the principles of the examples and practical application, and to enable others skilled in the art to best utilize the examples in various embodiments and with various modifications as are suited to the particular use contemplated.

Claims

1. A processing method for a high-temperature gas-tight one-way valve, wherein the one-way valve includes a valve sleeve, a pin, a through-end housing, a sealant, a spring, a valve core, and a shut-off end housing; the through-end housing and the shut-off end housing are threadedly fixedly connected to form an internal hollow structure, and the through-end housing forms an inlet channel, the shut-off end housing has an outlet, the valve sleeve, pin, spring, and valve core are located within the hollow structure, the valve sleeve is fixed to the inlet channel port by the pin, and the valve core slides with the valve sleeve, the spring is disposed between the valve sleeve and the valve core, and the valve core closes the inlet channel under the action of the spring, so that liquid cannot flow from the outlet channel into the inlet channel; the sealant is disposed between the through-end housing and the shut-off end housing; Its features are, Includes the following steps: Step 1: Machin the valve sleeve, pin, conducting end housing, sealing ring, spring, valve core, and shut-off end housing separately; Step 2: Clean the valve sleeve, pin, conductor housing, sealing ring, spring, valve core, and stop housing with aviation gasoline, and blow them clean with compressed air; Step 3: Pretreatment involves heating the valve core, the conducting end housing, and the shut-off end housing to a high temperature of 280°C and holding them at that temperature for 2 hours. During this time, the conducting end housing and the shut-off end housing are kept connected and fixed, and a torque of 157 N·m is applied. Step 4: Roughly grind the corresponding mating sealing surfaces of the valve core and the port; Step 5: Assemble the spring, valve core, and valve sleeve, then thread or sleeve the valve sleeve to the port, and press the valve core against the port using the spring; Step 6: Drill through holes in the installed valve sleeve and inlet channel, and machine the holes into tapered holes; Step 7: Grind the pin against the tapered hole until there is at least one continuous and complete grinding mark on the tapered surface of the pin; Step 8: Press the honed pin into the tapered pin hole; Connect the conducting end housing and the cutting end housing with threads, apply high-temperature sealant, and apply tightening torque.

2. The processing method of the high-temperature gas-tight one-way valve as described in claim 1, characterized in that: The valve core is made of stainless steel.

3. The processing method of the high-temperature gas-tight one-way valve as described in claim 1, characterized in that: The conductive end housing and the cut-off end housing are made of aluminum or stainless steel.

4. The processing method of the high-temperature gas-tight one-way valve as described in claim 1, characterized in that: In step one, the sealing surfaces of the valve core, the conducting end housing, and the shut-off end housing can be planar ground to ensure a surface roughness of Ra0.

4.

5. The processing method of the high-temperature gas-tight one-way valve as described in claim 1, characterized in that: The sliding fit between the valve core and the valve sleeve is machined by rough turning followed by finish turning to improve the straightness of the shaft.

6. The processing method of the high-temperature gas-tight one-way valve as described in claim 1, characterized in that: After the pin is machined, the surface is polished with sandpaper to achieve a surface roughness of Ra1.

6.

7. The processing method of the high-temperature gas-tight one-way valve as described in claim 1, characterized in that: For rough grinding, use No. 10 white corundum micro powder, with a surface roughness Ra value of no more than 0.8μm and a flatness of no more than 0.01mm. Grind at a grinding speed of 50-60 times / min in an O-shaped motion.

8. The processing method of the high-temperature gas-tight one-way valve as described in claim 7, characterized in that: The grinding time for the valve core sealing surface is 2.5-3 hours, and the grinding time for the port sealing surface is 1.5-2 hours.

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