CN113290902A

CN113290902A - Preparation device and preparation method of brass-sandwiched rubber pad of aero-engine

Info

Publication number: CN113290902A
Application number: CN202110699442.XA
Authority: CN
Inventors: 陈洪; 牟春妍; 程磊; 黄成瑞
Original assignee: Xiangyang Hangtai Power Machine Factory
Current assignee: Xiangyang Hangtai Power Machine Factory
Priority date: 2021-06-23
Filing date: 2021-06-23
Publication date: 2021-08-24

Abstract

The invention relates to a device for preparing a brass-sandwiched rubber pad of an aero-engine, which comprises a lower template, a middle template and an upper template, wherein the upper template and the lower template are arranged up and down, and the middle template is clamped in the middle; the middle template comprises an annular outer template and an inner template positioned in the center of the outer template, and an annular cavity matched with the brass clamping rubber pad is formed between the outer template and the inner template; a plurality of third through holes are formed in the lower template, cylindrical pins are inserted into the third through holes, and the end portions of the cylindrical pins extend into the annular cavity and are matched with the bolt holes in the brass clamping rubber pads. The invention is used for solving the problems that the brass clamping rubber pad processed by the existing device is rough in bottom surface, difficult to take out, bare in copper sheet and the like.

Description

Preparation device and preparation method of brass-sandwiched rubber pad of aero-engine

Technical Field

The invention belongs to the field of preparation of rubber products lined with metal inserts, and particularly relates to a preparation device and a preparation method of a brass-sandwiched rubber pad for an aero-engine.

Background

The brass-sandwiched rubber pad is a typical thin-wall metal rubber pressing part with a complex structure, the thinnest thickness of the brass sheet of a metal framework is only 0.15 mm, the thickness difference of the whole appearance of the product is required to be not more than 0.1 mm after rubber pressing, and the brass rubber pad is mainly arranged on a shell of a parking device of an aircraft engine fuel regulator or a joint surface of the shell of the fuel pump and a middle shell to prevent oil liquid in the shell from leaking, so that the brass rubber pad has a sealing effect.

The device adopted by the existing preparation mode comprises a lower template, an upper template and a positioning pin, wherein the upper template and the lower template are installed together through the positioning pin, a closed cavity and a circular boss corresponding to a brass clamping rubber pad are processed on the upper surface of the lower template, and the bottom surface of the closed cavity is rough during processing. After the device is used for vulcanization, the prepared brass clamping rubber pad has the phenomena of difficulty in taking out of the device, bare copper sheets, unstable size, dark and not bright surface, rough surface and the like.

Disclosure of Invention

The invention aims to provide a preparation device and a preparation method of a brass clamping rubber pad of an aeroengine, which are used for solving the problems that the brass clamping rubber pad processed by the existing device is rough in bottom surface, difficult to take out, bare in copper sheet and the like.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a preparation facilities of aeroengine clip brass rubber pad which characterized in that: the die comprises a lower template 1, a middle template 2 and an upper template 3, wherein the upper template 3 and the lower template 1 are arranged up and down, and the middle template 2 is clamped in the middle; the middle template 2 comprises an annular outer template 11 and an inner template 12 positioned in the center of the outer template 11, and an annular cavity 13 matched with the brass clamping rubber pad is formed between the outer template 11 and the inner template 12; a plurality of third through holes are formed in the lower template 1, cylindrical pins 5 are inserted into the third through holes, and the end portions of the cylindrical pins 5 extend into the annular cavity 13 and are matched with bolt holes in the brass clamping rubber pads.

Furthermore, a plurality of second through holes which are uniformly distributed are formed in the outer template 11, corresponding second through holes are also formed in the upper template 3 and the lower template 1, and the second through holes in the outer template 11, the upper template 3 and the lower template 1 are simultaneously inserted through the second positioning pins 6, so that the outer template 11, the upper template 3 and the lower template 1 are positioned.

Furthermore, a plurality of first through holes are uniformly distributed in the inner template 12, corresponding first through holes are also formed in the lower template 1, and the first positioning pins 4 are simultaneously inserted into the first through holes in the inner template 12 and the first through holes in the lower template 1, so that the inner template 12 and the lower template 1 are positioned.

A preparation method of an aircraft engine brass-sandwiched rubber pad is characterized by comprising the following steps:

the method comprises the following steps: processing brass sheet skeleton

S101, clamping and fixing a stack of brass sheets together by using a steel plate respectively from top to bottom, and then processing each hole;

s102, cutting the outline of the brass sheet by taking the hole as a processing reference;

s103, loosening the steel plate to detach the brass sheet, cleaning and drying the surface of the brass sheet, clamping and fixing a stack of brass sheets by the steel plate again, and waiting for the next process;

step two: brass sheet skeleton correction

S201, selecting a proper temperature to perform stress relief heat treatment on the thin copper sheet;

s202, chemically passivating the surface of the brass sheet skeleton;

step three: sand blasting treatment of brass sheet framework

S301, soaking the brass sheet skeleton in solvent oil for brushing, and naturally airing;

s302, performing sand blowing treatment on the dried brass sheet framework;

s303, immersing the brass sheet skeleton subjected to sand blowing into solvent oil again for brushing, drying at room temperature for more than 20min, and performing next step of gluing within 30min after drying;

s304, uniformly brushing an adhesive on the surface of the brass sheet framework along one direction by using a row of pens, placing the brass sheet framework coated with the adhesive on a steel plate, drying in the air for 45-60 min, and then placing the brass sheet framework in a drying vessel for storage for later use;

step four: production of brass sandwiched rubber pad blank

S401, pressing rubber into a rubber sheet with a designed size, and vulcanizing;

s402, manufacturing the shape of the film and corresponding holes by using a brass sheet framework without sand blowing and gluing as a template;

s403, clamping the brass sheet skeleton coated with the adhesive between two rubber sheets, clamping the brass sheet skeleton at the edge by using a flat tongs, and combining the brass sheet skeleton and the brass sheet skeleton into a whole to form a brass-sandwiched rubber pad blank;

step five: curing of the mold

S501, preheating any device for preparing the aero-engine brass-sandwiched rubber pad;

s502, mounting cylindrical pins 5 on the lower template 1 to form circular bosses which correspond to bolt holes of brass clamping rubber pads one by one; installing a middle template 2, and placing brass rubber pad blanks in the annular cavity 13; then installing an upper template 3;

s503, placing the preparation device in the center of a vulcanizing press for vulcanization;

and S504, after the vulcanization time is up, opening the upper template 3 and the middle template 2, and taking out the vulcanized brass-sandwiched rubber pad.

Further, the step S201 includes: and (3) clamping and leveling the brass sheet by using a clamp, keeping the brass sheet in the state, putting the brass sheet into a furnace, keeping the brass sheet at the temperature of 300 +/-10 ℃ for 2-6 h, discharging the brass sheet from the furnace, cooling the brass sheet to the normal temperature, and then removing the clamp.

Further, the step S202 includes: chemical degreasing is carried out for 10min to 30min in an electrolytic degreasing bath at the temperature of 60 ℃ to 90 ℃, acid washing is carried out for 5s to 15s in a mixed solution of sulfuric acid and nitric acid, photochemical treatment is carried out for 5s to 15s in a degreasing bath, passivation is carried out for 5s to 30s at room temperature, and a uniform passivation film is formed on the surface of the passivated brass sheet framework.

Further, the sand blowing parameters in step S302 are: the sand blowing pressure is 0.1MPa to 0.3MPa, the sand grain size is 100 meshes to 150 meshes, and the sand grain material is quartz sand.

Further, the step S401 includes: repeatedly refining rubber to obtain rubber sheet with thickness of 0.5mm or less, placing the rubber sheet on a flat plate of a vulcanizer, pressing at normal temperature under pressure of 10MPa + -0.5 MPa for 10min + -1 min, cold-pressing the rubber sheet to required thickness, standing for 20min + -1 min, and vulcanizing after the rubber sheet is stable in shrinkage.

Further, the step S501 includes: the preparation apparatus was placed in the center of a vulcanizer plate and heated to 149 ℃ under a pressure of not more than 1 MPa.

Further, the step S503 includes: after vulcanization parameters are set, starting a switch of a vulcanizing machine to carry out heating vulcanization; wherein the vulcanization temperature is 151 ℃ plus or minus 2 ℃, the vulcanization time is 40min, and the vulcanization pressure is 14MPa plus or minus 1 MPa.

Compared with the prior art, the invention has the following beneficial effects:

(1) the device of the invention ensures that the installation and the positioning of the blank are accurate, and all the surfaces contacted with the brass clamping rubber pads are very smooth.

(2) The brass clamping rubber pad prepared by the device is convenient and quick to take out, and the surface of the product is smooth, bright and free of defects.

(3) The brass sheet is uniformly wrapped by the rubber, the brass sheet is not exposed, and the symmetry degree of the two surfaces of the rubber and the brass sheet is better.

(4) The brass sheet framework is convenient to shape, and the brass sheet can keep a flat state without rebounding.

Drawings

FIG. 1 is a schematic top view of a prepared brass sandwiched rubber pad.

Fig. 2 is a schematic cross-sectional view of the brass-sandwiched rubber pad of fig. 1.

FIG. 3 is a schematic sectional view of a production apparatus.

FIG. 4 is a schematic top view of the manufacturing apparatus of FIG. 3.

Fig. 5 is a schematic view of a middle template.

In the figure: 1. the device comprises a lower template, a middle template, an upper template, a first positioning pin, a second positioning pin, a cylindrical pin and a second positioning pin, wherein the lower template is 2; 11. an outer die plate 12, an inner die plate 13 and an annular cavity.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Taking the preparation of the brass clamping rubber gasket in fig. 1 and 2 as an example, the device for preparing the brass clamping rubber gasket for the aero-engine, as shown in fig. 3 and 4, comprises a lower template 1, a middle template 2 and an upper template 3, wherein the upper template 3 and the lower template 1 are arranged up and down, and the middle template 2 is clamped in the middle. As shown in fig. 3 and 5, the middle mold plate 2 comprises an annular outer mold plate 11 and an inner mold plate 12 positioned in the center of the outer mold plate 11, and an annular cavity 13 matched with the shape of a brass rubber gasket is formed between the outer mold plate 11 and the inner mold plate 12. Eight third through holes are formed in the lower template 1, cylindrical pins 5 are inserted into the third through holes, and the end portions of the cylindrical pins 5 extend into the annular cavity 13 and are matched with the number and the shape of the bolt holes in the brass clamping rubber pad. The outer template 11 is provided with two second through holes distributed left and right, the upper template 3 and the lower template 1 are also provided with corresponding second through holes, and the second through holes in the outer template 11, the upper template 3 and the lower template 1 are simultaneously inserted through the second positioning pins 6, so that the positioning of the outer template 11, the upper template 3 and the lower template 1 is realized. The inner template 12 is provided with two first through holes distributed left and right, the lower template 1 is also provided with corresponding first through holes, and the first through holes on the inner template 12 and the lower template 1 are simultaneously inserted through the first positioning pins 4, so that the positioning of the inner template 12 and the lower template 1 is realized.

A preparation method of an aircraft engine brass-sandwiched rubber pad comprises the following steps:

the method comprises the following steps: processing brass sheet skeleton

1. The processing method of the brass sheet framework comprises the following steps: the machining method comprises the steps of firstly, shearing and blanking by a plate shearing machine, clamping a stack of thin brass sheets together in parallel by a thick steel plate, then machining a central hole and a bolt hole by a machining center, and finally, cutting the outline of the brass sheet by using the hole as a machining reference in a linear cutting mode.

2. And disassembling the brass sheets, cleaning the cooling liquid on the surface, drying the brass sheets by using compressed air with the pressure of 0.5-0.6 MPa, and clamping the stack of brass sheets by using a thick steel plate again.

Step two: brass sheet skeleton correction

1. The thin copper sheet is subjected to stress relief heat treatment at a proper temperature, so that the processing stress in the copper sheet and the residual stress of raw materials are eliminated, and the copper sheet can keep a flat state without rebounding. The shape correcting method comprises the following steps: before stress is removed, the copper sheet is clamped and leveled by a clamp, kept in the state, enters an air furnace, is kept at the temperature of 300 +/-10 ℃ for 2-6 h, is taken out of the furnace and cooled to the normal temperature, and then the clamp is removed.

2. Chemically passivating the surface of a brass sheet framework, chemically removing oil in an electrolytic oil removal groove at the temperature of 60-90 ℃ for 10-30 min, pickling in a mixed solution of sulfuric acid and nitric acid for 5-15 s, photochemically removing oil in the copper removal groove for 5-15 s, passivating for 5-30 s at room temperature, and applying a uniform passivation film on the surface of the passivated framework without allowing unremoved oxides and over-corrosion.

Step three: sand blasting treatment of brass sheet framework

1. Cleaning: soaking the brass sheet framework in No. 120 solvent oil, and naturally drying after cleaning dirt and oil seals on the surface of the framework by holding a brush.

2. Blowing sand: and selecting proper sand blowing pressure and sand grain size to reduce the deformation tendency of the copper sheet, and manually correcting the small deformation. When the manual shape correction is carried out, clean medical rubber gloves are needed to be worn, and the manual shape correction is carried out under the clean environment with the temperature and humidity meeting the requirements. Blowing parameters of sand: blowing pressure: 0.1MPa to 0.3MPa, sand grain size: 100-150 meshes, sand material: and (4) quartz sand.

3. And (3) cleaning, namely immersing the brass sheet skeleton subjected to sand blowing into No. 120 solvent oil for continuous brushing twice, cleaning, drying at room temperature for not less than 20min, and gluing within 30min after drying.

4. And uniformly brushing the adhesive on the surface of the brass sheet framework along one direction by using a clean row pen, placing the brass sheet coated with the adhesive on a clean steel plate, and drying in clean air for 45-60 min. The brass sheet skeleton coated with the glue is placed in a drying vessel for storage, so that the influence of dust, oil stain and water vapor is isolated, and the brass sheet skeleton can be taken out during vulcanization.

Step four: production of brass sandwiched rubber pad blank

1. Repeatedly refining 5080 rubber to obtain rubber sheet with thickness of 0.5mm or less, placing the rubber sheet on a clean vulcanizing machine plate, pressing at normal temperature under pressure of 10MPa + -0.5 MPa for 10min + -1 min, cold pressing the rubber sheet to desired thickness, standing for 20min + -1 min, and vulcanizing after the rubber sheet is stable in shrinkage.

2. The clean brass sheet skeleton without sand blowing and glue spreading is used as a template to manufacture the shape of the film and the corresponding holes, and the number of the film is two.

3. The brass sheet coated with the adhesive is clamped in the middle, the manufactured adhesive sheets are placed on the front and back sides, the holes and the shapes of the adhesive sheets and the brass sheet are aligned, and the edges are clamped by clean flat tongs to integrate the three sheets.

Step five: curing of the mold

1. Preheating, placing the preparation device in the center of a flat plate of a vulcanizing machine, and heating to 149 ℃ under the pressure of not more than 1 MPa.

2. Eight cylindrical pins 5 are installed on the upper surface of the lower template 1 to form eight circular bosses, the bosses correspond to holes for clamping brass rubber pads one by one, an inner template 12 of the middle template 2 is installed on the lower template 1 through two short positioning pins 4 and an outer template 11 are installed on the lower template 1 through two long positioning pins 6 respectively, an annular cavity 13 which is closed by the inner template and the outer template corresponds to the appearance of the brass rubber pads, a prepared blank for clamping the brass rubber pads is placed in the annular cavity 13, an upper template 3 is installed through the two long positioning pins 6, and the lower surface of the upper template 3 is in contact with the upper surface of the middle template 2.

3. Sulfurize, arrange the device in vulcanizing press central authorities, set for vulcanization parameter after, start the vulcanizer switch and heat the vulcanization, the vulcanization temperature: 151 ℃ plus or minus 2 ℃, vulcanization time: 40min, vulcanization pressure: 14MPa +/-1 MPa.

4. And after the vulcanization time is up, opening the upper template 3 and the middle template 2, and taking out the vulcanized brass-sandwiched rubber pad.

Step six: deburring of brass clamping rubber pad

The deburring method comprises the following steps: and (4) removing the residual glue on the outer contour of the product by using a blade or scissors. The sand rod is clamped on the burr machine, the motor is started, the product is held by hand, and the residual glue in each hole of the product is polished completely by the sand rod. And (4) dipping the absorbent cotton with absolute ethyl alcohol to wipe the gel foam on the outer surface and in the pores of the product.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a preparation facilities of aeroengine clip brass rubber pad which characterized in that: the die comprises a lower template (1), a middle template (2) and an upper template (3), wherein the upper template (3) and the lower template (1) are arranged up and down, and the middle template (2) is clamped in the middle; the middle template (2) comprises an annular outer template (11) and an inner template (12) positioned in the center of the outer template (11), and an annular cavity (13) matched with the brass clamping rubber pad is formed between the outer template (11) and the inner template (12); a plurality of third through holes are formed in the lower template (1), cylindrical pins (5) are inserted into the third through holes, and the end portions of the cylindrical pins (5) extend into the annular cavity (13) and are matched with bolt holes in the brass clamping rubber pads.

2. The device for preparing an aircraft engine brass-sandwiched rubber pad according to claim 1, characterized in that: the outer template (11) is provided with a plurality of uniformly distributed second through holes, the upper template (3) and the lower template (1) are also provided with corresponding second through holes, and the second through holes in the outer template (11), the upper template (3) and the lower template (1) are simultaneously inserted through second positioning pins (6), so that the outer template (11), the upper template (3) and the lower template (1) are positioned.

3. The device for preparing an aircraft engine clip brass rubber pad according to claim 2, characterized in that: the inner template (12) is provided with a plurality of first through holes which are uniformly distributed, the lower template (1) is also provided with corresponding first through holes, and the first through holes in the inner template (12) and the lower template (1) are simultaneously inserted through the first positioning pins (4), so that the inner template (12) and the lower template (1) are positioned.

4. A preparation method of an aircraft engine brass-sandwiched rubber pad is characterized by comprising the following steps:

the method comprises the following steps: processing brass sheet skeleton

step two: brass sheet skeleton correction

s202, chemically passivating the surface of the brass sheet skeleton;

step three: sand blasting treatment of brass sheet framework

s302, performing sand blowing treatment on the dried brass sheet framework;

step four: production of brass sandwiched rubber pad blank

step five: curing of the mold

S501, carrying out preheating treatment on the device for preparing the aero-engine brass-sandwiched rubber pad of any one of claims 1 to 3;

s502, mounting cylindrical pins (5) on the lower template (1) to form circular bosses which correspond to bolt holes of brass clamping rubber pads one by one; installing a middle template (2), and placing brass clamping rubber pad blanks in the annular cavity (13); then installing an upper template (3);

and S504, after the vulcanization time is up, opening the upper template (3) and the middle template (2), and taking out the vulcanized brass-sandwiched rubber pad.

5. The method for preparing an aircraft engine clip brass rubber pad according to claim 4, wherein the step S201 comprises: and (3) clamping and leveling the brass sheet by using a clamp, keeping the brass sheet in the state, putting the brass sheet into a furnace, keeping the brass sheet at the temperature of 300 +/-10 ℃ for 2-6 h, discharging the brass sheet from the furnace, cooling the brass sheet to the normal temperature, and then removing the clamp.

6. The method for preparing an aircraft engine clip brass rubber pad of claim 5, wherein the step S202 includes: chemical degreasing is carried out for 10min to 30min in an electrolytic degreasing bath at the temperature of 60 ℃ to 90 ℃, acid washing is carried out for 5s to 15s in a mixed solution of sulfuric acid and nitric acid, photochemical treatment is carried out for 5s to 15s in a degreasing bath, passivation is carried out for 5s to 30s at room temperature, and a uniform passivation film is formed on the surface of the passivated brass sheet framework.

7. The method for preparing an aircraft engine brass-sandwiched rubber pad according to claim 4, wherein the sand blowing parameters in the step S302 are as follows: the sand blowing pressure is 0.1MPa to 0.3MPa, the sand grain size is 100 meshes to 150 meshes, and the sand grain material is quartz sand.

8. The method for preparing an aircraft engine clip brass rubber pad according to claim 4, wherein the step S401 comprises: repeatedly refining rubber to obtain rubber sheet with thickness of 0.5mm or less, placing the rubber sheet on a flat plate of a vulcanizer, pressing at normal temperature under pressure of 10MPa + -0.5 MPa for 10min + -1 min, cold-pressing the rubber sheet to required thickness, standing for 20min + -1 min, and vulcanizing after the rubber sheet is stable in shrinkage.

9. The method for preparing an aircraft engine clip brass rubber pad according to claim 4, wherein the step S501 includes: the preparation apparatus was placed in the center of a vulcanizer plate and heated to 149 ℃ under a pressure of not more than 1 MPa.

10. The method for preparing an aircraft engine clip brass rubber pad of claim 9, wherein the step S503 includes: after vulcanization parameters are set, starting a switch of a vulcanizing machine to carry out heating vulcanization; wherein the vulcanization temperature is 151 ℃ plus or minus 2 ℃, the vulcanization time is 40min, and the vulcanization pressure is 14MPa plus or minus 1 MPa.