Cleaning composite process method before chromium plating of deep-hole part
Through a composite process method, combining high-pressure cleaning and chemical treatment, the problem of removing oil and impurities from the inner holes of deep-hole parts was solved, the adhesion and cleaning quality of the chrome plating layer were improved, and the service life of the plating solution was extended.
Patent Information
- Application Number
- CN202510917696.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-03
- Publication Date
- 2025-10-17
AI Technical Summary
Existing technologies make it difficult to effectively remove oil stains, impurities and oxide scale on the inner holes of deep-hole parts, which causes the chrome plating layer to fall off, affecting the service life of the plating solution and making the cleaning quality unstable.
A composite process method is adopted, including high-pressure cleaning, chemical treatment and mechanical wiping. High-pressure cleaning machines, degreasing tanks, lead removal tanks, neutralization tanks and other equipment are used, combined with high-pressure pumps and centrifugal pumps. Through a multi-step cleaning process, oil stains and impurities in the inner hole are removed to ensure the cleaning quality before chrome plating.
It can effectively remove oil and impurities from the inner holes of deep-hole parts, improve the adhesion of the chrome plating layer and the stability of the cleaning quality, and extend the service life of the plating solution.
Smart Images
Figure CN120796995A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of part cleaning, in particular to a deep hole part pre-chroming cleaning composite process. BACKGROUND
[0002] The barrel is a key part of the gun product, and its surface treatment method is inner bore chroming. The pre-plating cleaning quality of the barrel directly determines the plating effect of the chromium layer and affects the service life of the plating solution. In the production process, the pre-plating inner hole oil stain, impurity cleaning, and incomplete removal of oxides often occur, resulting in chromium layer peeling. The barrel belongs to a slender pipe, with a high length-diameter ratio of 80, and has the characteristics of difficult cleaning of the inner wall and poor cleaning quality stability. It is difficult to effectively remove the oil stains and impurities attached to the barrel using the traditional and single immersion cleaning method.
[0003] Therefore, in order to improve the cleaning quality of the barrel before chroming, an effective inner hole cleaning technology is needed to clean the oil stains, impurities, and scale attached to the barrel. SUMMARY
[0004] The purpose of the present application is to provide a deep hole part pre-chroming cleaning composite process to solve the problem of substandard pre-chroming cleaning quality of the barrel inner hole.
[0005] The purpose of the present application is achieved by the following scheme: a deep hole part pre-chroming cleaning composite process, comprising the following steps: 1) Pre-cleaning preparation: prepare cleaning devices, clamps, multiple water washing tanks, lead removal tanks, oil removal tanks, neutralization tanks, bore cleaning machines, and pickling devices. The cleaning devices include high-pressure cleaning machine A, high-pressure cleaning machine B, three water storage tanks, three sets of high-pressure reciprocating pumps, and three sets of light vertical multi-stage centrifugal pumps, six sets of filters, two water storage tanks are filled with degreasing agent and heated to 50-60℃, and the other water storage tank is filled with pure water and heated to 50-60℃; 2) Install the barrel: clamp the barrel on the clamp, align the center of the cleaning rod of the cleaning machine A with the center of the barrel, press the forward button, and then close the cleaning machine cover after the cleaning rod smoothly enters the barrel 5-10mm; 3) High-pressure rough cleaning: turn on the light vertical multi-stage centrifugal pump, filter, high-pressure reciprocating pump, and oil-water separator of the cleaning machine A, and put the barrel into the water storage tank containing the degreasing agent for cleaning; 4) High-pressure hot water washing: install and clean the barrel after rough cleaning using the cleaning machine B in the water storage tank containing pure water according to steps 2 and 3; 5) Clamping: the body tube is placed on the workbench, the ring is put into the body tube, and the bolt is tightened with a wrench. The body tube is lifted by the electric hoist and placed in the washing tank; 6) Hot water cleaning: the clamped body tube is soaked in the water tank containing 60°C hot water. The body tube is moved back and forth and up and down for about 1-3 minutes. 7) Lead removal: the body tube of step 6 is soaked in a lead removal tank containing 50-70°C lead removal solution for 45-50 minutes. 8) Cold water cleaning: the body tube is completely soaked in a water tank containing room temperature cold water. The body tube is moved back and forth and up and down for about 1-3 minutes. 9) Chemical degreasing: the body tube is placed in a degreasing solution above 90°C for 30-40 minutes. 10) Hot water cleaning: the degreased body tube is cleaned according to step 6. 11) Disassembly of the clamp: the body tube is placed on the operating table, and the clamp, ring and other items are removed in turn. 12) Lime bore cleaning: the body tube is placed in the lime bore cleaning machine and clamped. Light calcium carbonate is dipped with a brush and loaded into the body tube. The lime bore cleaning machine is started, and the brush is moved back and forth for more than 2 minutes. After cleaning, the brush is removed, and the body tube is repeatedly washed with tap water. 13) High pressure cleaning: operate cleaning machine A, and install and clean the body tube according to steps 2 and 3. 14) High pressure hot water cleaning: operate cleaning machine B, and clean the cleaned body tube according to step 4. 15) Clamping: the anode is inserted into the body tube, then the upper and lower caps are loaded, and finally the cathode frame is loaded. 16) Cold water cleaning: the body tube is cleaned according to step 8. 17) Anode pickling: the body tube is placed in the pickling solution by the electric hoist, the anode wire is treated, the current and time required by the process are set on the digital instrument, and the anode pickling is started. 18) Neutralization: the body tube is completely soaked in the neutralization solution under the condition of 60-80°C for 1-3 minutes. 19) The cleaned body tube is treated according to the body tube chromium plating process.
[0006] The working pressure of the high pressure reciprocating pump in the high pressure cleaning machine is 3.5-4.5MPa, the working pressure of the light vertical multi-stage centrifugal pump is 0.4-0.6MPa, the working temperature is 50-60°C, and the cleaning time is 6-10 minutes.
[0007] The degreasing agent in the water tank is LD-1141 degreasing agent, and the total alkalinity of the degreasing agent is 20-40 points.
[0008] The lead-removing solution in the lead-removing tank is composed of a sodium hydroxide solution with a concentration of 300-350 g / L and a chromic acid solution with a concentration of 80-130 g / L.
[0009] The oil-removing solution in the oil-removing tank is a sodium hydroxide solution with a concentration of 80-120 g / L.
[0010] The pickling solution in step 17 is a sulfuric acid solution with a concentration of 1000-1250 g / L and a temperature of less than 35℃.
[0011] The neutralizing solution in step 18 is a sodium carbonate solution with a concentration of 40-60 g / L.
[0012] The advantages of the present application are as follows: (1) the high-pressure cleaning machine has strong versatility and is suitable for cleaning the inner holes and outer circles of all 25mm, 30mm and other caliber body tubes before chromium plating; (2) the high-pressure cleaning operation is convenient, and the cleaning state and effect of the workpiece can be easily observed during production; (3) the high-pressure cleaning efficiency is high, and the working cycle of the cleaning machine is 8-15 min per piece; (4) the introduction of impurities in the solution before chromium plating can be greatly reduced during the high-pressure cleaning process, thereby prolonging the service life of the plating solution; (5) the cleaning quality is stable, the solution preparation is simple, the effect is remarkable, and the oil stains, impurities and oxide skins and other dirt in the inner holes, outer circles and R parts of the body tube can be well removed, thereby ensuring the stability of the chromium plating quality. BRIEF DESCRIPTION OF DRAWINGS
[0013] Fig. 1 is a cleaning composite process flowchart; Fig. 2 is a schematic diagram of the high-pressure cleaning process. DETAILED DESCRIPTION
[0014] As shown in Figs. 1-2 , a cleaning composite process method before chromium plating of a deep-hole part comprises the following steps: 1) preparation before cleaning: preparing a cleaning device, a clamp, a plurality of water washing tanks, a lead-removing tank, an oil-removing tank, a neutralizing tank, a bore cleaning machine and a pickling device, the cleaning device comprising a high-pressure cleaning machine A, a high-pressure cleaning machine B, three water storage tanks, three sets of high-pressure reciprocating pumps and three sets of light vertical multi-stage centrifugal pumps, six sets of filters, two of the water storage tanks are filled with degreasing agent and heated to 50-60℃, and the other water storage tank is filled with pure water and heated to 50-60℃, the degreasing agent in the water storage tank is LD-1141 degreasing agent, and the total alkalinity of the degreasing agent is 20-40 points.
[0015] 2) Install the barrel: clamp the barrel on the clamp, make the cleaning rod center of cleaning machine A consistent with the barrel center position, and press the jog forward button to make the cleaning rod smoothly enter the muzzle 5-10 mm, then close the cleaning machine cover; 3) High pressure rough cleaning: open the light vertical multi-stage centrifugal pump, filter, high pressure reciprocating pump and oil-water separator of cleaning machine A, put the barrel into the water tank containing degreasing agent for cleaning; 4) High pressure hot water washing: install and clean the barrel after rough cleaning in the water tank containing pure water according to steps 2 and 3 using cleaning machine B; 5) Clamping: arrange the barrels neatly on the workbench, prepare the lifting ring, loosen the bolt on the lifting ring counterclockwise with a wrench, then put the lifting ring into the barrel from the inner bore about 260 mm, and tighten the bolt with a wrench. Use the electric hoist to lift the barrel assembled on the clamp into the water washing tank; 6) Hot water cleaning: soak the clamped barrel in the water washing tank containing 60℃ hot water, and swing the barrel back and forth and lift it up and down for about 1-3 min; 7) Lead removal: soak the barrel in step 6 in the lead removal tank containing 50-70℃ lead removal solution for 45-50 min, and the lead removal solution is composed of 300-350 g / L sodium hydroxide solution and 80-130 g / L chromic acid solution; 8) Cold water cleaning: soak the barrel in the water washing tank containing room temperature cold water, and swing the barrel back and forth and lift it up and down for about 1-3 min; 9) Chemical oil removal: soak the barrel in the oil removal solution above 90℃ for 30-40 min, and the oil removal solution is 80-120 g / L sodium hydroxide solution; 10) Hot water cleaning: clean the oil-removed barrel according to step 6; 11) Disassemble the clamp: place the barrel on the operation table, and disassemble the clamp, lifting ring and other items in turn; 12) Lime wiping: place the barrel in the lime wiping machine and clamp it, dip the brush in light calcium carbonate and put it into the barrel, start the lime wiping machine, wipe back and forth for more than 2 min, take out the brush after wiping, and rinse the barrel repeatedly with tap water; 13) High pressure fine cleaning: operate the cleaning machine A, and install and clean the barrel according to steps 2 and 3; 14) High pressure hot water washing: operate the cleaning machine B, and clean the fine cleaned barrel according to step 4; 15) Clamping: put the anode into the barrel, then put in the upper and lower caps, and finally put in the cathode holder; 16) Cold water cleaning: clean the barrel according to step 8; 17) anode pickling: the body tube is put into the pickling solution by the electric hoist, the anode wire is treated, the process required current and time are set on the digital instrument, and then the anode pickling is started, the pickling solution is a sulfuric acid solution with a concentration of 1000-1250 g / L and a temperature less than 35℃. 18) neutralization: the body tube is soaked in the neutralization solution at 60-80℃ for 1-3 min, and the neutralization solution is a sodium carbonate solution with a concentration of 40-60 g / L; 19) the cleaned body tube is subjected to the chromium plating process.
[0016] The working pressure of the high-pressure reciprocating pump in the high-pressure cleaning machine is 3.5-4.5 MPa, the working pressure of the light vertical multi-stage centrifugal pump is 0.4-0.6 MPa, the working temperature is 50-60℃, and the cleaning time is 6-10 min.
[0017] The high-pressure cleaning process is to clean the inner hole and outer circle of the body tube part before chromium plating by using the high-pressure cleaning system, configure the working liquid in the water storage tank, pass through the filter and high-pressure pump, and then enter the cleaning machine through the pipeline, the body tube part is placed in the cleaning machine, and the reciprocating process of the machine in the cleaning machine is controlled by electricity to make the body tube enter the cleaning state, and the cleaning of the inner hole and outer circle of the body tube is realized, and the cleaning liquid after cleaning flows back to the water storage tank through the return pipeline. The high-pressure reciprocating pump is used for flushing the inner hole of the body tube, and the light vertical multi-stage centrifugal pump is used for flushing the outer circle of the body tube. The high-pressure cleaning mainly removes the oil stains and impurities mixed in the inner hole, positive line and R part of the body tube, and removes the lead and oxide skin and other impurities attached to the inner hole by chemical reaction of sodium hydroxide, sulfuric acid and other solutions.
[0018] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, and the changes made by the person skilled in the art without departing from the spirit of the present application fall within the protection scope of the present application.
Claims
1. A composite process for cleaning deep hole parts before chrome plating, characterized in that: The following steps are involved: 1) Preparation before cleaning: Prepare the cleaning equipment, fixtures, multiple water washing tanks, lead removal tanks, oil removal tanks, neutralization tanks, barrel cleaning machines, and pickling equipment. The cleaning equipment includes high-pressure cleaning machine A, high-pressure cleaning machine B, three water storage tanks, three sets of high-pressure reciprocating pumps, three sets of lightweight vertical multi-stage centrifugal pumps, and six sets of filters. Fill two water storage tanks with degreaser and heat them to 50-60°C. Fill the other water storage tank with pure water and heat it to 50-60°C. 2) Install the barrel: Clamp the barrel onto the fixture, aligning the center of the cleaning rod of cleaning machine A with the center of the barrel. Press the forward button to allow the cleaning rod to smoothly enter the muzzle 5-10mm, then close the cleaning machine cover. 3) High-pressure rough cleaning: Turn on the light vertical multi-stage centrifugal pump, filter, high-pressure reciprocating pump and oil-water separator of cleaning machine A, and place the barrel into the water tank filled with degreasing agent for cleaning; 4) High-pressure hot water cleaning: After rough cleaning, install and clean the barrel according to steps 2 and 3 using cleaning machine B in a water tank filled with pure water; 5) Clamping: Place the barrel neatly on the workbench and prepare to install the lifting ring. Loosen the bolt on the lifting ring counterclockwise with a wrench. Then insert the lifting ring from the inner bore into the barrel about 260mm from the big end. Tighten the bolt with a wrench. Use an electric hoist to lift the barrel assembled on the clamp into the water washing tank. 6) Hot Water Cleaning: Immerse the clamped barrel in a 60°C hot water tank, using the clamp to swing the barrel back and forth and lift it up and down for about 1-3 minutes. 7) Lead removal: Soak the barrel from step 6 in a lead removal tank filled with 50-70°C lead removal solution for 45-50 minutes; 8) Cold Water Cleaning: Immerse the barrel in a tank of room temperature cold water. Use a clamp to swing the barrel back and forth and lift it up and down for about 1-3 minutes. 9) Chemical degreasing: Soak the entire barrel in a degreasing solution above 90°C for 30-40 minutes. 10) Hot water cleaning: Clean the barrel after degreasing according to step 6; 11) Disassembling the clamp: Place the barrel flat on the operating table and remove the clamp, lifting ring, and other items in order; 12) Lime Sweeping: Place the barrel in a lime squeezing machine and clamp it. Use a brush to dip light calcium carbonate and place it into the barrel. Start the lime squeezing machine and scrub the barrel back and forth for at least 2 minutes. After scrubbing, remove the brush and rinse the barrel repeatedly with tap water. 13) High-pressure cleaning: Operate cleaning machine A and install and clean the barrel according to steps 2 and 3; 14) High-pressure hot water washing: Operate washing machine B and clean the barrel according to step 4 after fine washing; 15) Clamping: Insert the anode into the barrel, then install the upper and lower caps, and finally install the cathode holder; 16) Cold Water Rinse: Clean the barrel as in step 8; 17) Anodic pickling: Place the barrel into the pickling solution using an electric hoist, connect the anode wires, set the current and time required by the process on the digital display, and then start anodic pickling; 18) Neutralization: Immerse the entire barrel in a neutralizing solution at 60-80°C for 1-3 minutes. 19) The cleaned barrel is chrome-plated according to the barrel chrome plating process.
2. The process according to claim 1, wherein: The working pressure of the high-pressure reciprocating pump in the high-pressure cleaning machine is 3.5~4.5MPa, the working pressure of the light vertical multi-stage centrifugal pump is 0.4~0.6MPa, the working temperature is 50~60℃, and the cleaning time is 6~10min.
3. The process according to claim 1, wherein: The degreaser in the water tank is LD-1141 degreaser, and the total alkalinity of the degreaser is 20 to 40 points.
4. The process according to claim 1, wherein: The lead removal solution in the lead removal tank in step 7 is composed of a sodium hydroxide solution with a concentration of 300 to 350 g / L and a chromic acid solution with a concentration of 80 to 130 g / L.
5. The process according to claim 1, wherein: The degreasing solution in the degreasing tank in step 9 is a sodium hydroxide solution with a concentration of 80 to 120 g / L.
6. The process according to claim 1, wherein: The pickling solution in step 17 is a sulfuric acid solution with a temperature of less than 35° C. and a concentration of 1000 to 1250 g / L.
7. The process according to claim 1, wherein: The neutralization solution in step 18 is a sodium carbonate solution with a concentration of 40 to 60 g / L.