阅读说明：本技术 一种机匣螺塞的胶接装配方法 (Glue joint assembling method for screw plug of casing ) 是由 王伟 方岚枫 王铁海 宋丙红 王亚楠 曾桃飞 毛春明 黄鹏跃 戎漪婷 于 2021-09-03 设计创作，主要内容包括：本发明属于航空发动机装配技术领域,特别涉及一种机匣螺塞的胶接装配方法,包括步骤1：表面准备；步骤2：在螺塞和机匣螺孔上涂附胶粘剂；步骤3：将螺塞装配至机匣螺孔内,形成装配后的零件；步骤4：将零件进行固化处理,与现有技术相比,本发明在安装前,螺塞至少旋入旋出一次,可以保证胶液均布在螺纹上；清除螺塞头上多余的胶液,使其不能进入油路中；固化时将螺塞竖直放置,且螺塞外表面朝下,有效的避免了由于多余胶粘剂的残留而造成的油路堵塞。本发明采用合理的步骤,增加了预安装及固化时的科学摆放,有效的保证了螺塞胶接装配后的密封性,并避免了由于多余胶粘剂的残留而造成的油路堵塞。(The invention belongs to the technical field of aeroengine assembly, and particularly relates to a glue joint assembly method of a cartridge screw plug, which comprises the following steps of 1: preparing a surface; step 2: coating an adhesive on the screw plug and the screw hole of the casing; and step 3: assembling the screw plug into the screw hole of the casing to form an assembled part; and 4, step 4: compared with the prior art, the invention has the advantages that the screw plug is screwed in and out at least once before installation, so that glue solution can be uniformly distributed on the screw thread; removing redundant glue solution on the plug screw head to prevent the glue solution from entering an oil way; when the adhesive is cured, the screw plug is vertically arranged, and the outer surface of the screw plug faces downwards, so that the oil way blockage caused by the residual of the redundant adhesive is effectively avoided. The invention adopts reasonable steps, increases scientific arrangement during pre-installation and curing, effectively ensures the sealing performance of the screw plug after glue joint assembly, and avoids oil circuit blockage caused by residual redundant adhesive.)

1. A glue joint assembling method of a screw plug of a machine case is characterized in that: the method comprises the following steps:

step 1: preparing a surface;

step 2: coating an adhesive on the screw plug and the screw hole of the casing;

and step 3: assembling the screw plug into the screw hole of the casing to form an assembled part;

and 4, step 4: and curing the part.

2. A glue joint assembly method of an insert plug according to claim 1, wherein: the surface preparation of step 1 comprises the following steps:

step 1.1, cleaning oil stains in the screw plug and the screw hole by using a cleaning agent;

and step 1.2, airing the cleaned screw plug and the cleaned case at room temperature.

3. A glue joint assembly method of an insert plug according to claim 2, wherein: the cleaning agent adopted in the step 1.1 is acetone or absolute ethyl alcohol; step 1.2, the airing time at room temperature is 15-20 min.

4. A glue joint assembly method of an insert screw according to claim 3, characterised in that: if greasy dirt exists on the surfaces of the screw plug and the screw hole of the case after the screw plug and the case are aired for 15-20 min at room temperature, acetone or absolute ethyl alcohol is continuously used for degreasing, and clean and dry compressed air is used for blow-drying the screw plug and the screw hole of the case or drying the screw plug and the screw hole of the case in an oven with the temperature lower than 120 ℃.

5. A glue joint assembly method of an insert plug according to claim 1, wherein: and 2, coating adhesive on two to three circles of threads at the head parts of the screw plug and the screw hole.

6. A glue joint assembly method of an insert plug according to claim 1, wherein: the step 3 specifically comprises the following steps:

step 3.1, screwing the screw plug into the screw hole and screwing the screw plug out of the screw hole for at least 1 time;

3.2, removing redundant glue solution on the plug head of the screw plug by using a cleaning agent;

3.3, coating the adhesive on the head part of the screw plug again at two to three circles;

step 3.4, the screw plug is completely screwed into the screw hole of the casing and keeps a screwing state, and the upper surface of the screw plug is lower than the mounting plane of the casing;

and 3.4, cleaning the plug head of the screw plug again by using a cleaning agent to remove the redundant glue solution.

7. A glue joint assembly method of an insert screw according to claim 6, wherein: step 3.1, screwing the screw plug into and out of the screw hole for 1-2 times; the cleaning agent used in the step 3.2 and the step 3.4 is acetone or absolute ethyl alcohol; and 3.4, the upper surface of the screw plug is not less than 0.5mm lower than the mounting plane of the casing.

8. A glue joint assembly method of an insert plug according to claim 1, wherein: the step 4 specifically comprises the following steps:

and (3) according to the curing temperature and time requirements of the coated adhesive, placing the assembled parts in a heating furnace for curing, wherein in the curing process, the screw plug is vertically placed in the heating furnace, and the outer surface of the screw plug faces downwards.

9. A glue joint assembly method of an insert plug according to claim 8, wherein: the curing temperature of the adhesive is 90 +/-50 ℃, and the curing time is 0.5-2 h.

10. A glue joint assembly method of an insert plug according to claim 1, wherein: further comprising the step 5: and (5) sealing test, wherein the step 5 specifically comprises the following steps: and (3) carrying out a sealing test after the part is cured, wherein the test conditions are as follows: immersing the parts in water or antirust liquid, keeping the parts under the pressure of at least 0.5MPa for at least 3min, and if no visible bubbles are generated on the parts, the parts are qualified, and if bubbles are generated, the parts are unqualified.

Technical Field

The invention belongs to the technical field of assembly of aero-engines, and particularly relates to a glue joint assembly method of a cartridge screw plug.

Background

The oil circuit of a casing of an aircraft engine and a transmission system is complicated, a plurality of process holes need to be processed in the process of processing the oil circuit, the process holes are assembled with screw plugs to seal the oil circuit after the oil circuit is processed, and the screw plugs need to be assembled after being coated with glue for achieving the sealing and locking effects, and the currently common method comprises the following steps: oil removal, gluing, assembly, solidification and inspection. However, the method cannot effectively ensure that the oil way has no residual redundant adhesive and the tightness of the screw plug after being glued, the residual redundant adhesive can cause oil way blockage, the poor sealing can cause oil leakage, and the use reliability of the aircraft engine or the transmission system is finally influenced.

Disclosure of Invention

The purpose of the invention is as follows: the method effectively ensures the sealing performance of the screw plug after glue joint assembly and avoids oil path blockage caused by residual of redundant adhesive.

The technical scheme of the invention is as follows:

a glue joint assembling method for a screw plug of a machine case comprises the following steps:

step 1: preparing a surface;

step 2: coating an adhesive on the screw plug and the screw hole of the casing;

and step 3: assembling the screw plug into the screw hole of the casing to form an assembled part;

and 4, step 4: and curing the part.

Further, the surface preparation of step 1 comprises the following steps:

step 1.1, cleaning oil stains in the screw plug and the screw hole by using a cleaning agent;

and step 1.2, airing the cleaned screw plug and the cleaned case at room temperature.

Further, the cleaning agent adopted in the step 1.1 is acetone or absolute ethyl alcohol; step 1.2, the airing time at room temperature is 15-20 min.

Further, if oil stains exist on the surfaces of the screw plug and the screw hole of the casing after the screw plug and the casing are dried for 15-20 min at room temperature, acetone or absolute ethyl alcohol is continuously used for removing oil, and clean and dry compressed air is used for drying the screw plug and the screw hole of the casing or drying the screw plug and the screw hole of the casing in an oven at the temperature of lower than 120 ℃.

Further, step 2 is to coat adhesive on two to three circles of threads at the head of the screw plug and the screw hole.

Further, step 3 specifically comprises the following steps:

step 3.1, screwing the screw plug into the screw hole and screwing the screw plug out of the screw hole for at least 1 time;

3.2, removing redundant glue solution on the plug head of the screw plug by using a cleaning agent;

3.3, coating the adhesive on the head part of the screw plug again at two to three circles;

step 3.4, the screw plug is completely screwed into the screw hole of the casing and keeps a screwing state, and the upper surface of the screw plug is lower than the mounting plane of the casing;

and 3.4, cleaning the plug head of the screw plug again by using a cleaning agent to remove the redundant glue solution.

Further, in the step 3.1, the screw plug is screwed into and out of the screw hole for 1-2 times; the cleaning agent used in the step 3.2 and the step 3.4 is acetone or absolute ethyl alcohol; and 3.4, the upper surface of the screw plug is not less than 0.5mm lower than the mounting plane of the casing.

Further, step 4 specifically comprises:

and (3) according to the curing temperature and time requirements of the coated adhesive, placing the assembled parts in a heating furnace for curing, wherein in the curing process, the screw plug is vertically placed in the heating furnace, and the outer surface of the screw plug faces downwards.

Further, the curing temperature of the adhesive is 90 +/-50 ℃, and the curing time is 0.5-2 hours.

Further, the method also comprises the step 5: and (5) sealing test, wherein the step 5 specifically comprises the following steps: and (3) carrying out a sealing test after the part is cured, wherein the test conditions are as follows: immersing the parts in water or antirust liquid, keeping the parts under the pressure of at least 0.5MPa for at least 3min, and if no visible bubbles are generated on the parts, the parts are qualified, and if bubbles are generated, the parts are unqualified.

The invention has the beneficial effects that: compared with the prior art, the screw plug is screwed in and out at least once before installation, so that glue solution can be uniformly distributed on the screw thread; removing redundant glue solution on the plug screw head to prevent the glue solution from entering an oil way; when the adhesive is cured, the screw plug is vertically arranged, and the outer surface of the screw plug faces downwards, so that the oil way blockage caused by the residual of the redundant adhesive is effectively avoided. The invention adopts reasonable steps, increases scientific arrangement during pre-installation and curing, effectively ensures the sealing performance of the screw plug after glue joint assembly, and avoids oil circuit blockage caused by residual redundant adhesive.

Detailed Description

Example 1:

the invention relates to a glue joint assembling method of a screw plug of a casing, which comprises the following steps:

(1) before the method is carried out, a screw hole is manufactured on a casing to be assembled, the screw hole is positioned on a mounting plane of the casing, and the thread of the screw hole is matched with the thread of a screw plug;

(2) surface preparation

a) Oil stains on the screw plug and the screw hole are removed by using acetone or absolute ethyl alcohol, so that the screw hole and the screw plug are ensured not to have oil stains and other impurities, and the subsequent cementing assembly effect is influenced;

b) airing the screw plug and the casing to be screwed for 15-20 min at room temperature, and volatilizing the water, acetone and ethanol in the screw plug and the screw hole; and if the surface of the workpiece is still greasy after being dried for 15-20 min at room temperature, continuously using acetone or absolute ethyl alcohol to remove oil, and then drying the part by using clean and dry compressed air or drying the part in an oven at the temperature of lower than 120 ℃.

(3) Glue spreading

The adhesive is coated on the second to third threads at the head parts of the screw plug and the screw hole, the adhesive does not need to be coated on the other parts, and because the thread gap between the screw plug and the screw hole is very small, the adhesive is coated on the second to third threads at the head parts of the screw plug and the screw hole basically meets the bonding requirement, and how to coat the adhesive on all the threads of the screw plug and the screw hole, the coating amount is large, redundant adhesive is generated, and the subsequent cleaning is inconvenient.

(4) Assembly

a) Screwing the screw plug into the screw hole for 1-2 times; so that the surfaces of the screw plug and the screw hole are completely covered with glue solution;

b) at the moment, redundant glue solution in the thread gap overflows from the head of the screw plug, and acetone or absolute ethyl alcohol is used for removing the redundant glue solution on the head of the screw plug;

c) at the moment, the part with insufficient glue coating possibly exists in a thread gap between the screw plug and the screw hole, so that the adhesive is coated on two to three parts of the head of the screw plug; then a screw plug is further arranged and screwed tightly, so that the glue solution is completely filled in the thread gap;

d) the screw plug is completely screwed into the screw hole of the casing and keeps a screwing state, the upper surface of the screw plug is not less than 0.5mm lower than the mounting plane of the casing, and the upper surface of the screw plug is prevented from interfering with other parts on the casing;

e) removing the redundant glue solution around the screw plug by using acetone or absolute ethyl alcohol again; removing glue solution overflowing from gap

(5) Curing

According to the curing temperature and time requirements (the temperature requires 90 +/-50 ℃ and the time requires 0.5-2 h) of the coated adhesive, the assembled part is placed in a heating furnace for curing, in the curing process, the screw plug is vertically placed in the heating furnace, the outer surface of the screw plug faces downwards, the oil way is located above the screw plug, and the oil way blockage caused by the residual of the redundant adhesive is effectively avoided

(6) Sealing test

And (3) carrying out a sealing test after curing, wherein the test conditions are as follows: immersing in water or antirust liquid, keeping for at least 3min under the pressure of at least 0.5MPa, if no visible bubbles are generated, the product is qualified, and if bubbles are generated, the product is not qualified.

Before installation, the screw plug is screwed in and out at least once, so that glue solution can be uniformly distributed on the threads; removing redundant glue solution on the plug screw head to prevent the glue solution from entering an oil way; when the adhesive is cured, the screw plug is vertically arranged, and the outer surface of the screw plug faces downwards, so that the oil way blockage caused by the residual of the redundant adhesive is effectively avoided. The invention adopts reasonable steps, increases scientific arrangement during pre-installation and curing, effectively ensures the sealing performance of the screw plug after glue joint assembly, and avoids oil circuit blockage caused by residual redundant adhesive.

Example 2:

the glue joint assembly of the screw plug of the air inlet casing of a certain aircraft engine requires good sealing after glue joint. The specific implementation steps are as follows:

(1) surface preparation

a) Removing oil stains on the screw plug and the bolt hole by using acetone;

b) air-drying at room temperature for 18 min;

(2) glue spreading

Coating ARALDITE 2014 adhesive on the first three threads of the screw plug and the screw hole;

(3) assembly

a) Screwing the screw plug into the screw hole once;

b) removing redundant glue solution on the plug screw head by using acetone;

c) coating metal glue on the first three parts of the screw plug;

d) installing a screw plug and screwing tightly, and ensuring that the surface of the screw plug is 0.8mm lower than the installation plane;

e) excess glue around the plug was removed with acetone.

(4) Curing

a) According to the curing temperature and time requirements of the smeared ARALDITE 2014 adhesive, the assembled parts are placed in a heating furnace for curing, the curing temperature is 90 ℃, and the curing time is 1 h; during the curing process, the plug screw is vertically placed in a heating furnace, and the outer surface of the plug screw faces downwards.

(5) Sealing test

And (3) carrying out a sealing test after curing, wherein the test conditions are as follows: and soaking the glass fiber reinforced plastic into antirust liquid, keeping the glass fiber reinforced plastic for 5min under the pressure of 0.8MPa, and if no visible bubbles are generated, gluing and assembling the glass fiber reinforced plastic.

The invention has been described in an illustrative manner, and it is to be understood that the invention is not limited to the precise form disclosed, and that various insubstantial modifications of the inventive concepts and solutions, or their direct application to other applications without such modifications, are intended to be covered by the scope of the invention.