Local chromium plating method and device for main cylinder hole of aero-engine special-shaped cylinder accessory

Abstract

The invention provides a local chromium plating method and device for a main cylinder hole of an aero-engine special-shaped cylinder accessory. The method comprises the steps that an upper cylinder opening and a lower cylinder opening of a main cylinder body of the special-shaped cylinder accessory are sealed and blocked through an upper isolation body and a lower isolation body respectively, hole wall areas at cylinder opening sections are isolated, and the upper isolation body and the lower isolation body are fixedly blocked on the upper cylinder opening and the lower cylinder opening of the main cylinder body through clamping of an upper plate and a lower plate; a hoop is fixedly connected to the outer wall of the main cylinder in a surrounding manner, and is connected with a cathode of the chromium plating tank through a lead; the auxiliary anode bar vertically and sequentially penetrates through the upper plate and the bar body through hole of the upper isolator, and the lower end part of the auxiliary anode bar is accommodated and supported in the accommodating blind hole of the lower isolator; the auxiliary anode bar is electrically connected with the chrome plating tank anode through a wire. The device is simple and small in structure, short in processing and manufacturing period and low in cost; installation is simple and rapid, and production preparation time can be shortened; the problem that chromium plating is difficult in the deep hole area of the part is solved, uniformity and consistency of chromium plating of the inner hole of the cylinder are guaranteed, and the method can be popularized and used for local chromium plating of the inner holes of the accessory cylinders of most aero-engines.

Description

Technical Field

[0001] The invention belongs to the technical field of electroplating chrome, and in particular relates to a method and a device for local chrome plating of a main barrel hole of an aero-engine special-shaped barrel accessory. Background Art

[0002] The accessories of aircraft engines participate in the completion of engine starting, fuel / lubricating oil supply, working state control and other functions, and are an important part of the engine system. In order to extend the service life of the accessories, a hard chrome layer is often plated on the surface of the material to improve the surface hardness and wear resistance of the parts. Due to the poor dispersion ability of the chrome plating bath, the wall of deep and blind holes cannot be directly chrome plated, and for example Figure 1 Some of the special-shaped barrel parts shown in the figure have a main barrel body with a deep straight barrel and a large aperture. A branch barrel opening which is obliquely connected to the main barrel hole is also provided on the barrel wall of the main barrel body. It is required to perform local chrome plating on the wall of the main barrel hole. The non-chrome-plated area includes the hole wall area adjacent to the barrel openings at both ends of the main barrel hole and the inner wall of each branch barrel opening. The surface of the non-chrome-plated area is insulated and protected, and the remaining hole wall needs to be chrome-plated. Summary of the invention

[0003] The present invention aims to solve the problems of local protection of the hole wall of the special-shaped cylinder and the difficulty of deep hole chrome plating, and improve the qualified rate of parts processing. The specific technical solution is as follows:

[0004] The chrome plating device is used for local chrome plating of the main cylinder hole of the special-shaped cylinder accessory of the aircraft engine. The special-shaped cylinder accessory has a main cylinder body with a deep straight cylinder and a large hole diameter. The main cylinder body wall is also provided with a branch cylinder opening obliquely connected with the main cylinder hole.

[0005] The upper plate and the lower plate have fixing through holes for bolts to pass through at four corners of the plate bodies of the upper plate and the lower plate;

[0006] A rod through hole is provided at the center of the upper plate for the auxiliary anode rod to pass through, and a plurality of injection holes for injecting chrome plating liquid are evenly provided around the rod through hole.

[0007] The screw plug is used to seal the branch tube opening of the special-shaped tube accessory. The side cylindrical surface of the screw plug is sealed against the inner wall of the branch tube to isolate it from the chrome plating liquid, thereby achieving insulation protection for the wall of the branch tube. The number, diameter and depth of the screw plug match those of the branch tube.

[0008] An upper isolator and a lower isolator, wherein the upper and lower isolators respectively have a disc-shaped isolator disk;

[0009] A rod through hole for passing the auxiliary anode rod is provided at the center of the isolation disk of the upper isolation member, and injection holes corresponding in number and position to the injection holes of the upper plate are evenly provided around the rod through hole, and a radially outwardly extending flange is fixedly provided around the upper portion of the isolation disk of the upper isolation member;

[0010] A blind hole for accommodating and supporting the lower end of the auxiliary anode rod is provided at the center of the upper surface of the isolation disk of the lower isolation piece; a radially outwardly extending flange body is fixedly provided on the peripheral side of the lower portion of the isolation disk of the lower isolation piece;

[0011] The disc-shaped isolation disks of the upper and lower isolation bodies are used to seal and block the upper and lower tube openings of the deep straight tube with a larger hole diameter of the special-shaped tube accessories, and the peripheral cylindrical surface of the isolation disk is sealed against the hole wall area near the upper and lower tube openings of the main tube body to isolate these two areas from the chrome plating liquid, that is, to ensure that the non-chrome-plated surface is not chrome-plated;

[0012] The flanges of the upper and lower isolators are respectively pressed against and covered on the end faces of the upper and lower ends of the main cylinder, which not only further strengthens the sealing effect between the isolators and the cylinder wall, but also plays a buffering and protective role on the cylinder mouth, avoiding deformation and damage caused by the upper and lower plates directly pressing against the cylinder mouth;

[0013] The invention also comprises a clamp, which is electrically connected to the outer wall of the main cylinder of the special-shaped cylinder accessory in a surrounding manner, and electrically connects the special-shaped cylinder accessory with the cathode through a wire.

[0014] Furthermore, a receiving groove for receiving a flange body of the upper isolating body is provided on the lower surface of the upper plate, and the lower surface of the flange body of the upper isolating body can be flush with the lower surface of the upper plate.

[0015] Furthermore, the upper surface of the lower plate is provided with a receiving groove for accommodating the flange body of the corresponding lower isolation body, and the upper surface of the flange body of the lower isolation body can be flush with the upper surface of the lower plate.

[0016] The method for local chrome plating of the main barrel hole of the special-shaped barrel of an aircraft engine accessory adopts the chrome plating device as described above.

[0017] Further, including

[0018] The upper and lower barrel openings of the main barrel body of the special-shaped barrel accessory are sealed and blocked with upper and lower isolating bodies, wherein the flange bodies of the upper and lower isolating bodies are pressed against the end faces of the upper and lower barrel openings of the main barrel body, respectively, and the peripheral cylindrical surface of the isolating disk is sealed against the hole wall area adjacent to the upper and lower barrel openings of the main barrel body;

[0019] The lower plate supports the lower isolator, and the upper plate is pressed on the upper isolator, and the rod through hole and injection hole of the upper plate are respectively opposite to the rod through hole and injection hole of the upper isolator; four bolts are respectively passed through the corresponding fixing through holes of the upper and lower plates and screwed with nuts, so that the upper and lower isolators are fixed and blocked at the upper and lower barrel openings of the main cylinder through the clamping of the upper and lower plates; a clamp is used to surround and fix the outer wall of the main cylinder, and the clamp is connected to the cathode of the chrome-plated tank through a wire;

[0020] The main cylinder is placed vertically, and the auxiliary anode rod is passed vertically through the rod through holes of the upper plate and the upper isolator in sequence, and the lower end of the auxiliary anode rod is accommodated and supported in the accommodation blind hole of the lower isolator; the auxiliary anode rod is electrically connected to the anode of the chrome plating tank through a wire;

[0021] Inject chrome plating liquid into the cylinder through the injection hole;

[0022] Chrome plating is performed by applying electricity.

[0023] The present invention can not only insulate and protect the non-chrome-plated surface of the cylinder to reduce current loss, but also solve the problem of difficult chrome plating in deep holes and improve the quality of the chrome plating layer in the deep holes. The device has an ingenious design idea, a simple structure, a convenient and fast manufacturing process, and a low manufacturing cost. It can shorten the insulation protection time of the cylinder, reduce production labor intensity, ensure the uniformity of the chrome plating layer in the inner hole area that needs chrome plating, and improve the parts processing efficiency and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings that constitute a part of the present invention are used to provide further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 It is a schematic diagram of the assembly structure of the chrome plating device of the present invention.

[0026] Reference numerals in the figure: lower plate 1; bolt 2; screw plug 3; clamp 4; auxiliary anode rod 5; nut 6; bolt 7; nut 8; upper plate 9; upper spacer 10; lower spacer 11; main cylinder 100; flange 101. DETAILED DESCRIPTION

[0027] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0028] As shown in the figure, the chrome plating device of the present invention comprises

[0029] The upper plate 9 and the lower plate 1 have fixing through holes for the bolts 2 to pass through at the four corners of the upper and lower plates;

[0030] A rod through hole is provided at the center of the upper plate 9 for the auxiliary anode rod 5 to pass through, and a plurality of injection holes for injecting chrome plating liquid are evenly provided around the rod through hole.

[0031] The screw plug 3 is used to seal the branch tube opening of the special-shaped tube accessory, and the side cylindrical surface of the screw plug 3 is sealed against the inner wall of the branch tube to isolate it from the chrome plating liquid, thereby achieving insulation protection for the wall of the branch tube, that is, ensuring that the non-chrome-plated surface is not chrome-plated; the number, diameter and depth of the screw plug 3 match those of the branch tube;

[0032] An upper isolator 10 and a lower isolator 11, wherein the upper and lower isolators respectively have a disc-shaped isolator disk;

[0033] A rod through hole for passing the auxiliary anode rod 5 is provided at the center of the isolation disk of the upper isolation member 10, and injection holes corresponding in number and position to the injection holes of the upper plate 9 are evenly provided around the rod through hole, and a radially outwardly extending flange is fixedly provided around the upper portion of the isolation disk of the upper isolation member 10;

[0034] A blind hole for accommodating and supporting the lower end of the auxiliary anode rod 5 is provided at the center of the upper surface of the isolation disk of the lower isolation member 11. The blind hole can not only perform the above functions of the lower end of the auxiliary anode rod 5, but also prevent the chrome plating liquid from leaking therefrom. A radially outwardly extending flange body is fixedly provided on the peripheral side of the lower portion of the isolation disk of the lower isolation member 11.

[0035] The disc-shaped isolation disks of the upper and lower isolation bodies are used to seal and block the upper and lower tube openings of the deep straight tube and large-diameter main tube body 100 of the special-shaped tube-like accessories, and the peripheral cylindrical surface of the isolation disk is sealed against the hole wall area near the upper and lower tube openings of the main tube body to isolate these two areas from the chrome plating liquid, that is, to ensure that the non-chrome-plated surface is not chrome-plated;

[0036] The flange bodies 101 of the upper and lower isolation bodies are respectively pressed against and covered on the end faces of the upper and lower ends of the main cylinder body, which not only further strengthens the sealing effect between the isolation body and the cylinder wall, but also plays a buffering and protective role for the cylinder mouth, avoiding deformation damage caused by the upper and lower plates directly pressing against the cylinder mouth.

[0037] Furthermore, in order to prevent the upper and lower isolators from being lateral misaligned relative to the upper and lower plates, the lower surface of the upper plate 9 and the upper surface of the lower plate 1 are respectively provided with receiving grooves for accommodating the corresponding upper and lower isolators (10, 11) for limiting. More specifically, the receiving grooves are for accommodating the flange bodies of the upper and lower isolators, and ensuring that the flange bodies are flush with the corresponding plate surfaces of the upper and lower plates, that is, the lower surface of the flange body of the upper isolator 10 is flush with the lower surface of the upper plate 9, and the upper surface of the flange body of the lower isolator 11 is flush with the upper surface of the lower plate 1.

[0038] The invention also comprises a clamp 4, which is electrically connected to the outer wall of the main cylinder of the special-shaped cylinder-like accessory in a surrounding manner, and electrically connects the special-shaped cylinder-like accessory to the cathode through a wire.

[0039] Chrome plating method using this device:

[0040] The upper and lower barrel openings of the main barrel body of the special-shaped barrel accessory are sealed and blocked with upper and lower isolating bodies, wherein the flange bodies of the upper and lower isolating bodies are pressed against the end faces of the upper and lower barrel openings of the main barrel body, respectively, and the peripheral cylindrical surface of the isolating disk is sealed against the hole wall area adjacent to the upper and lower barrel openings of the main barrel body;

[0041] The lower plate 1 supports the lower isolator, and the upper plate 9 is pressed on the upper isolator, and the rod through hole and injection hole of the upper plate 9 are respectively opposite to the rod through hole and injection hole of the upper isolator; four bolts are respectively passed through the corresponding fixing through holes of the upper and lower plates and screwed with nuts, so that the upper and lower isolators are fixed and blocked at the upper and lower barrel openings of the main cylinder through the clamping of the upper and lower plates; a clamp 4 is used to surround and fix the outer wall of the main cylinder, and the clamp 4 is connected to the cathode of the chrome-plated tank through a wire;

[0042] The main cylinder is placed upright, and the auxiliary anode rod 5 is passed vertically through the rod through-holes of the upper plate 9 and the upper isolator in sequence, and the lower end of the auxiliary anode rod 5 is accommodated and supported in the accommodation blind hole of the lower isolator; the auxiliary anode rod 5 is electrically connected to the anode of the chrome plating tank through a wire;

[0043] Inject chrome plating liquid into the cylinder through the injection hole;

[0044] Chrome plating is performed by applying electricity.

[0045] The screw plug, upper isolator, lower isolator, upper plate and lower plate are made of insulating materials, for example, the screw plug is made of nylon, and the upper isolator, lower isolator and upper and lower plates are made of organic glass.

[0046] The device of the present invention has a simple and compact structure, a short processing and manufacturing cycle, and a low cost; it is simple and quick to install, and can reduce production preparation time; it solves the problem of difficult chrome plating in deep hole areas of parts, ensures that the chrome plating in the inner holes of the cylinder is uniform and consistent, and can be promoted for local chrome plating in the inner holes of most aircraft engine accessories.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A chrome plating device, used for local chrome plating of the main cylinder hole of special-shaped cylinder accessories of aircraft engines, wherein the special-shaped cylinder accessories have a main cylinder body of deep straight cylinder type and large aperture, and a branch cylinder mouth obliquely connected to the main cylinder hole is provided on the cylinder wall of the main cylinder body, characterized in that: include The upper plate and the lower plate have fixing through holes for bolts to pass through at four corners of the plate bodies of the upper plate and the lower plate; A rod through hole is provided at the center of the upper plate for the auxiliary anode rod to pass through, and a plurality of injection holes for injecting chrome plating liquid are evenly provided around the rod through hole. The screw plug is used to seal the branch tube opening of the special-shaped tube accessory. The side cylindrical surface of the screw plug is sealed against the inner wall of the branch tube to isolate it from the chrome plating liquid, thereby achieving insulation protection for the wall of the branch tube. The number, diameter and depth of the screw plug match those of the branch tube. An upper isolator and a lower isolator, wherein the upper and lower isolators respectively have a disc-shaped isolator disk; A rod through hole for passing the auxiliary anode rod is provided at the center of the isolation disk of the upper isolation member, and injection holes corresponding in number and position to the injection holes of the upper plate are evenly provided around the rod through hole, and a radially outwardly extending flange is fixedly provided around the upper portion of the isolation disk of the upper isolation member; A blind hole for accommodating and supporting the lower end of the auxiliary anode rod is provided at the center of the upper surface of the isolation disk of the lower isolation piece; a radially outwardly extending flange body is fixedly provided on the peripheral side of the lower portion of the isolation disk of the lower isolation piece; The disc-shaped isolation disks of the upper and lower isolation bodies are used to seal and block the upper and lower tube openings of the deep straight tube with a larger hole diameter of the special-shaped tube accessories, and the peripheral cylindrical surface of the isolation disk is sealed against the hole wall area near the upper and lower tube openings of the main tube body to isolate these two areas from the chrome plating liquid, that is, to ensure that the non-chrome-plated surface is not chrome-plated; The flanges of the upper and lower isolators are respectively pressed against and covered on the end faces of the upper and lower ends of the main cylinder, which not only further strengthens the sealing effect between the isolators and the cylinder wall, but also plays a buffering and protective role on the cylinder mouth, avoiding deformation and damage caused by the upper and lower plates directly pressing against the cylinder mouth; The invention also comprises a clamp, which is electrically connected to the outer wall of the main cylinder of the special-shaped cylinder accessory in a surrounding manner, and electrically connects the special-shaped cylinder accessory with the cathode through a wire.

2. The chrome plating device according to claim 1, characterized in that: The lower surface of the upper plate is provided with a receiving groove for receiving the flange body of the limiting upper isolating body, and the lower surface of the flange body of the upper isolating body can be flush with the lower surface of the upper plate.

3. The chrome plating device according to claim 1, characterized in that: The upper surface of the lower plate is provided with a receiving groove for receiving the flange body of the corresponding lower isolating body for limiting, and the upper surface of the flange body of the lower isolating body can be flush with the upper surface of the lower plate.

4. A method for local chrome plating of the main barrel hole of an aircraft engine special-shaped barrel accessory, characterized in that: The chrome plating device as claimed in claim 1 is used.

5. The method for local chrome plating of main barrel holes of special-shaped barrel accessories of aircraft engines as claimed in claim 4, characterized in that: include The upper and lower barrel openings of the main barrel body of the special-shaped barrel accessory are sealed and blocked with upper and lower isolating bodies, wherein the flange bodies of the upper and lower isolating bodies are pressed against the end faces of the upper and lower barrel openings of the main barrel body, respectively, and the peripheral cylindrical surface of the isolating disk is sealed against the hole wall area adjacent to the upper and lower barrel openings of the main barrel body; The lower plate supports the lower isolator, and the upper plate is pressed on the upper isolator, and the rod through hole and injection hole of the upper plate are respectively opposite to the rod through hole and injection hole of the upper isolator; four bolts are respectively passed through the corresponding fixing through holes of the upper and lower plates and screwed with nuts, so that the upper and lower isolators are fixed and blocked at the upper and lower barrel openings of the main cylinder through the clamping of the upper and lower plates; a clamp is used to surround and fix the outer wall of the main cylinder, and the clamp is connected to the cathode of the chrome-plated tank through a wire; The main cylinder is placed vertically, and the auxiliary anode rod is passed vertically through the rod through holes of the upper plate and the upper isolator in sequence, and the lower end of the auxiliary anode rod is accommodated and supported in the accommodation blind hole of the lower isolator; the auxiliary anode rod is electrically connected to the anode of the chrome plating tank through a wire; Inject chrome plating liquid into the cylinder through the injection hole; Chrome plating is performed by applying electricity.

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