Barrel-shaped inner wall local protection electroplating method

Abstract

The invention discloses a barrel-shaped inner wall local protection electroplating method, and belongs to the technical field of electroplating protection operation. According to the barrel-shaped inner wall local protection electroplating, a rubber sleeve local protection method is adopted. And the protective surface is completely closed, and no plating point is exposed at the joint. The barrel-shaped inner wall is locally protected and electroplated, and the elastic tension of a rubber sleeve, the pressure of the inner diameter of a part on rubber, the pressure of the end face of the rubber sleeve at a joint and water liquid under the tension of the water liquid are creatively reserved in a leather seam, so that protection is achieved. And a 3-shaped skin feeding method and a bamboo knife corner-warping skin unloading method are adopted, so that the work efficiency is high, and the working efficiency is high. According to the part cylindrical inner wall electroplating local protection method provided by the invention, the protection process is greatly simplified, and the technical requirements on operators are reduced; the problem of difficult paint removal is avoided; the protection period is shortened, repeated use can be achieved, environmental protection and safety are achieved, and the protection cost is reduced.

Description

Technical Field

[0001] The invention discloses a method for local protection electroplating of a barrel inner wall, belonging to the technical field of electroplating protection operation. Background Art

[0002] At present, parts need local protection due to special reasons during electroplating. For example, the inner wall of the barrel of the part needs local electroplating, and the non-electroplated inner wall needs local protection during electroplating. The non-electroplated surface of the inner wall is the part of the inner wall of the motor housing where the magnetic pole winding assembly is bonded. The commonly used protection method for the non-electroplated surface of the inner wall is to apply protective paint. The process is: pre-treatment before electroplating-paint adjustment-coating-drying-repairing-drying-electroplated. Its disadvantages are: first, it has high technical requirements for operators; because it is manually coated during construction, the thickness is uneven, and the paint film is prone to fall off at the edge; the paint film is prone to local blistering and protection leakage after hot acid, alkali, water, tank liquid, etc.; second, it is difficult to remove the paint after electroplating, and the local paint film cannot be completely removed during paint removal, or the paint stripper corrodes and destroys the coating, resulting in a low product qualification rate; third, the protection cycle is long and the cost is high. Summary of the invention

[0003] The purpose of the present invention is to solve the above technical problems, the present invention designs a barrel inner wall local protection electroplating method

[0004] The technical solution of the present invention is: a method for local protection electroplating of barrel inner wall, characterized in that it comprises the following steps:

[0005] 1) Determine the size of the protected part of the barrel-shaped inner wall of the part: determine the axial length L and inner diameter R of the protected part according to the part drawing;

[0006] 2) Make a protective leather case: Use acid and alkali resistant rubber to make a protective leather case. The leather case is a rectangular rubber plate. The circumference of the leather case is W = πR-S, S = (0.1~0.5) × δ; its width A = L; the thickness of the leather case δ is 6mm~10mm; the area of ​​the leather case is D = WL = (πR-S) × L.

[0007] 3) Pretreatment of protective leather cover: first use metal detergent solution to clean at 35℃~45℃ for 3min~5min, then use hot water at 50℃~60℃ for 10S~20S, then use cold water for 10S~20S. The above is one cleaning cycle; repeat 2~3 cleaning cycles; then soak in tap water for 3min~5min;

[0008] 4) Preheating of parts: Immerse the pre-plating treated parts in hot water at 60℃~70℃ for 3-5min;

[0009] 5) Install the protective leather case;

[0010] 6) Adsorption of clean water: Place the parts with the protective leather cover installed in a clean water tank at room temperature and soak for 5 to 10 minutes to complete the local protection of the electroplating of the cylindrical inner wall of the parts.

[0011] Furthermore, the barrel-shaped inner wall protection is applicable to parts with an inner diameter R greater than 15 mm.

[0012] Furthermore, when installing the protective leather cover, for a part with an axial step positioning reference, one end is aligned with the part step positioning reference, and the protective leather cover is unfolded into a cylindrical shape so that the protective leather cover fits the inner wall protection part.

[0013] Furthermore, when installing the protective leather cover, for parts without axial step positioning reference: when installing the protective leather cover, first make a marking line on the inner wall protection part, then align one end of the protective leather cover with the marking line, unfold the protective leather cover into a cylinder, and make the protective leather cover fit the inner wall protection part.

[0014] Furthermore, when installing the protective leather cover, the protective leather is folded into a "3" shape from the middle, and the two ends are aligned and placed in the hot shell and then unfolded.

[0015] Furthermore, the protective leather cover is removed, and a bamboo knife made of a bamboo piece is used to align the lower leather surface at one end corner of the seam of the removed protective leather, and the leather surface is lifted up and pulled.

[0016] Furthermore, the installed protective leather cover seams and the upper and lower leather cover edges are sealed by absorbing clean water to prepare for water filling. The inner diameter of the part is retained in the leather seam under the pressure of the rubber, the pressure of the end face of the rubber cover at the seam and the tension of the water itself, thereby achieving protection during the electroplating process.

[0017] Furthermore, the removed leather case is cleaned with a metal detergent solution at a temperature of 35°C to 45°C for 3min to 5min, then washed with hot water at 50°C to 60°C for 10S to 20S, and then washed with cold water for 10S to 20S. The above is one cleaning cycle; repeat 2 to 3 cleaning cycles; then soak it in tap water for 3min to 5min; and it can be used again.

[0018] The beneficial effects of the present invention are:

[0019] (1) The barrel inner wall is partially protected by electroplating, and a rubber sleeve is used for local protection. The protective surface is completely sealed, and there are no exposed plating points at the joints.

[0020] (2) The local protective electroplating on the barrel inner wall creatively utilizes the elastic tension of the rubber sleeve, the pressure of the inner diameter of the part on the rubber, the pressure of the joint at the end face of the rubber sleeve, and the tension of the water itself to remain in the leather seam to achieve protection.

[0021] (3) The rubber cover is a local protection method that is environmentally friendly and reusable.

[0022] (4) Local protection method with rubber cover. The rubber cover is simple to make, low in cost and easy to operate.

[0023] (5) The three-shaped skinning method and the bamboo knife corner skinning method have high success rate and high work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of leather board forming;

[0025] Figure 2 Diagram of makeup skin;

[0026] Figure 3 Schematic diagram of the protection surface status;

[0027] Figure 4 Schematic diagram of passivation appearance;

[0028] Figure 5 Passivate the internal representation. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with embodiments:

[0030] The general steps of a method for local protection electroplating of a barrel inner wall are as follows:

[0031] 1) Determine the size of the barrel-shaped inner wall protection part of the part: determine the axial length L and inner diameter R of the part to be protected according to the part drawing; (This solution is applicable to barrel-shaped inner wall protection parts with an inner diameter R greater than 15mm)

[0032] 2) Make a protective leather case: Use acid and alkali resistant rubber to make a protective leather case. The leather case is a rectangular rubber plate. The circumference of the leather case is W = πR-S, S = (0.1~0.5) × δ; its width A = L; the thickness of the leather case δ is 6mm~10mm; the area of ​​the leather case is D = WL = (πR-S) × L.

[0033] 3) Install the protective leather case:

[0034] 3.1. Pretreatment of protective leather case: first wash with metal detergent solution at 35℃~45℃ for 3min~5min, then wash with hot water at 50℃~60℃ for 10S~20S, then wash with cold water for 10S~20S. The above is one cleaning cycle; repeat 2~3 cleaning cycles; then soak with tap water for 3min~5min;

[0035] 3.2. Preheating of parts: Immerse the pre-plating treated parts in hot water at 60℃~70℃ for 3min~5min;

[0036] 3.3. Install the protective leather case: Install the protective leather case in one of the following ways:

[0037] 3.3.1. For parts with step positioning datum in the axial direction: when installing the protective leather cover, align one end with the step positioning datum of the part, unfold the protective leather cover into a cylindrical shape, and make the protective leather cover fit the inner wall protection part;

[0038] 3.3.2. For parts without step positioning reference in the axial direction: when installing the protective leather cover, first make a mark line on the inner wall protection part, then align one end of the protective leather cover with the mark line, unfold the protective leather cover into a cylindrical shape, and make the protective leather cover fit the inner wall protection part;

[0039] 4) Adsorption of clean water: Place the parts with the protective leather cover installed in a clean water tank at room temperature and soak for 3min to 5min to complete the local protection of the electroplating of the cylindrical inner wall of the parts.

[0040] 5) Remove the protective leather cover, use a bamboo knife made from a bamboo piece to aim at the lower leather surface at one end corner of the seam where the protective leather is to be removed, lift up the leather surface and pull it. Do not use metal knives to avoid scratching the surface coating of the parts.

[0041] According to the traditional process, the parts are machined and protected by the local protection method of leather cover. For example, if the inner wall of a motor housing is ф163х120 and needs to be protected, acid and alkali resistant rubber, 8mm thick material is used as the protective leather cover. The specific size of the protective leather cover is 493х120х8. When protecting, the housing is first pre-plated according to the process requirements, and then immersed in 60-70℃ hot water for 3-5 minutes and placed in a hot water tank for protection. After the protective leather is washed, it is immersed in water at room temperature for 3-5 minutes. When assembling, the protective leather is folded into a "3" shape from the middle, and the two ends are aligned and placed in the hot housing and then unfolded. (The 493х120х8 protective leather is aligned at both ends. When unfolded along the direction of the housing wall, the protective leather will be tightly attached to the inner wall of the housing under the top force of the two opposite ends to achieve the purpose of protection.) Ensure the size requirements of the protection part, and then put the protected parts into a normal temperature water tank for 3-5 minutes, so that the housing in the thermal expansion state will shrink and the protective leather of the protected part will be more closely attached to the inner wall of the housing. At the same time, the tiny gaps at the edge of the protective leather absorb water due to thermal expansion and contraction, so the acid, alkali, salt, electrolyte, etc. in the subsequent electroplating process will no longer enter the tiny gaps at the edge of the protective leather. After plating, clean the parts, remove the protective leather cover, use a bamboo knife made of bamboo pieces to aim at the lower leather surface at one end of the seam of the removed protective leather, lift the leather surface and pull it. Do not use metal knives to avoid scratching the surface coating of the parts.

[0042] Example 1

[0043] 1) Determine the size of the cylindrical inner wall protection part of the part: determine the axial length L = 120mm and the inner diameter D = 163mm of the part to be protected according to the part drawing. The cylindrical inner wall protection part of the part is on the axial step positioning reference;

[0044] 2) Make a protective leather cover: Use oil-resistant rubber to make a protective leather cover δ = 7mm. The protective leather cover is a rectangular rubber plate with a width of L = 120mm and a thickness of δ of 7mm.

[0045] Its length W = πR-S = 3.14X163-3.5 = 508.32mm

[0046] S=(0.1~0.5)×δ=0.5×7=3.5

[0047] The protective holster is a rectangular rubber plate whose length is slightly smaller than the inner diameter D to ensure that it is not too tight or too loose during assembly.

[0048] 3) Install the protective leather case:

[0049] 3.1. Pretreatment of the protective leather cover: first wash with metal detergent solution at 45℃ for 5 minutes, then wash with 60℃ hot water for 20S, and then wash with cold water for 20S. The above is one cleaning cycle; repeat 2 cleaning cycles; then soak in tap water for 5mi; soak the protective leather cover in tap water for 5min to make the protective leather cover in a contracted state for easy assembly.

[0050] 3.2. Preheating of parts: Immerse the pre-plating treated parts in 70°C hot water for 5 minutes. Preheating of parts is to make the parts in a thermal expansion state for easy assembly.

[0051] 3.3. Install the protective leather case: Install the protective leather case as follows:

[0052] 3.3.1. For parts with step positioning datum in the axial direction: when installing the protective leather cover, align one end with the step positioning datum of the part, install and fold the protective leather cover into a "3" shape from the middle, align the two ends and put it into the hot shell and then unfold it, unfold the protective leather cover into a cylindrical shape, and make the protective leather cover fit the inner wall protection part;

[0053] 4) Absorb clean water: Soak the parts with the protective leather cover in a clean water tank at room temperature for 10 minutes to complete the local protection of the electroplating of the cylindrical inner wall of the parts. Soak the parts with the protective leather cover in a clean water tank at room temperature for 10 minutes to allow the edge gap between the protective leather cover and the non-electroplated surface to be filled with clean water to protect the parts from being corroded by other liquids.

[0054] 5) Remove the protective leather cover, use a bamboo knife made from a bamboo piece to aim at the lower leather surface at one end corner of the seam where the protective leather is to be removed, lift up the leather surface and pull it. Do not use metal knives to avoid scratching the surface coating of the parts.

[0055] 6) Clean the removed leather case with metal detergent solution at 45°C for 5 minutes, then wash it with 60°C hot water for 20 seconds, and then wash it with cold water for 20 seconds. The above is one cleaning cycle; repeat 3 cleaning cycles; then soak it in tap water for 5 minutes; and it can be used again.

[0056] Example 2

[0057] 1) Determine the size of the cylindrical inner wall protection part of the part: According to the part drawing, determine the axial length L = 120mm and the inner diameter D = 163mm of the part to be protected. The cylindrical inner wall protection part of the part is 22mm away from the stop at one end in the axial direction;

[0058] 2) Make a protective leather cover: Use oil-resistant rubber to make a protective leather cover δ = 7mm. The protective leather cover is a rectangular rubber plate with a width of L = 120mm and a thickness of δ of 7mm.

[0059] Its length W = πR-S = 3.14X163-3.5 = 508.32mm

[0060] S=(0.1~0.5)×δ=0.5×7=3.5

[0061] The protective holster is a rectangular rubber plate whose length is slightly smaller than the inner diameter D to ensure that it is not too tight or too loose during assembly.

[0062] 3) Install the protective leather case:

[0063] 3.1. Pretreatment of the protective leather cover: first wash with metal detergent solution at 45℃ for 5 minutes, then wash with 60℃ hot water for 20S, and then wash with cold water for 20S. The above is one cleaning cycle; repeat 2 cleaning cycles; then soak in tap water for 5mi; soak the protective leather cover in tap water for 5min to make the protective leather cover in a contracted state for easy assembly.

[0064] 3.2. Preheating of parts: Immerse the pre-plating treated parts in 70°C hot water for 5 minutes. Preheating of parts is to make the parts in a thermal expansion state for easy assembly.

[0065] 3.3. Install the protective leather case: Install the protective leather case as follows:

[0066] 3.3.1. For parts without step positioning reference in the axial direction: when installing the protective leather cover, first make a mark line on the inner wall at a position 22mm away from the stop at one end, then align one end of the protective leather cover with the mark line, unfold the protective leather cover into a cylindrical shape, fold the protective leather into a "3" shape from the middle, align the two ends and put them into the hot shell, unfold the protective leather cover into a cylindrical shape, and make the protective leather cover fit the protective part of the inner wall;

[0067] 4) Absorb clean water: Soak the parts with the protective leather cover in a clean water tank at room temperature for 10 minutes to complete the local protection of the electroplating of the cylindrical inner wall of the parts. Soak the parts with the protective leather cover in a clean water tank at room temperature for 10 minutes to allow the edge gap between the protective leather cover and the non-electroplated surface to be filled with clean water to protect the parts from being corroded by other liquids.

[0068] 5) Remove the protective leather cover, use a bamboo knife made from a bamboo piece to aim at the lower leather surface at one end corner of the seam where the protective leather is to be removed, lift up the leather surface and pull it. Do not use metal knives to avoid scratching the surface coating of the parts.

[0069] 6) Clean the removed leather case with metal detergent solution at 45°C for 5 minutes, then wash it with 60°C hot water for 20 seconds, and then wash it with cold water for 20 seconds. The above is one cleaning cycle; 3 cleaning cycles; then soak it in tap water for 5 minutes; and it can be used again.

[0070] Example 3

[0071] 1) Determine the size of the cylindrical inner wall protection part of the part: determine the axial length L = 150mm and the inner diameter D = 130mm of the part to be protected according to the part drawing. The cylindrical inner wall protection part of the part is on the axial step positioning reference;

[0072] 2) Make a protective leather cover: Use oil-resistant rubber to make a protective leather cover δ = 9mm. The protective leather cover is a rectangular rubber plate with a width L = 150mm and a thickness δ of 9mm;

[0073] Its length W = πR-S = 3.14X130-4.5 = 403.7mm

[0074] S=(0.1~0.5)×δ=0.5×9=4.5

[0075] The protective holster is a rectangular rubber plate whose length is slightly smaller than the inner diameter D to ensure that it is not too tight or too loose during assembly.

[0076] 3) Install the protective leather case:

[0077] 3.1. Pretreatment of the protective leather cover: first wash with metal detergent solution at 40℃ for 5 minutes, then wash with 50℃ hot water for 20S, and then wash with cold water for 20S. The above is one cleaning cycle; repeat 2 cleaning cycles; then soak in tap water for 5mi; soaking the protective leather cover in tap water for 5min is to make the protective leather cover in a contracted state for easy assembly.

[0078] 3.2. Preheating of parts: Immerse the pre-plating treated parts in 60°C hot water for 5 minutes. Preheating of parts is to make the parts in a thermal expansion state for easy assembly.

[0079] 3.3. Install the protective leather case: Install the protective leather case as follows:

[0080] 3.3.1. For parts with step positioning datum in the axial direction: when installing the protective leather cover, align one end with the step positioning datum of the part, fold the protective leather cover into a "3" shape from the middle, align the two ends and put it into the hot shell and then unfold it, unfold the protective leather cover into a cylindrical shape, and make the protective leather cover fit the inner wall protection part;

[0081] 4) Absorb clean water: Soak the parts with the protective leather cover in a clean water tank at room temperature for 8 minutes to complete the local protection of the electroplating of the cylindrical inner wall of the parts. Soak the parts with the protective leather cover in a clean water tank at room temperature for 3 minutes to allow the edge gap between the protective leather cover and the non-electroplated surface to be filled with clean water to protect the parts from being corroded by other liquids.

[0082] 5) Remove the protective leather cover, use a bamboo knife made from a bamboo piece to aim at the lower leather surface at one end corner of the seam where the protective leather is to be removed, lift up the leather surface and pull it. Do not use metal knives to avoid scratching the surface coating of the parts.

[0083] 6) Clean the removed leather case with metal detergent solution at 35℃ for 3 minutes, then wash it with 50℃ hot water for 10S, and then wash it with cold water for 10S. The above is one cleaning cycle; repeat 2 cleaning cycles; then soak it in tap water for 3 minutes; and it can be used again.

[0084] Example 4

[0085] 1) Determine the size of the cylindrical inner wall protection part of the part: According to the part drawing, determine the axial length L = 150mm and the inner diameter D = 210 of the part to be protected. The cylindrical inner wall protection part of the part is 18mm away from the stop at one end in the axial direction;

[0086] 2) Make a protective leather cover: Use oil-resistant rubber to make a protective leather cover δ = 10mm. The protective leather cover is a rectangular rubber plate with a width L = 150mm and a thickness δ of 10mm;

[0087] Its length W = πR-S = 3.14X210-3 = 566.4mm

[0088] S=(0.1~0.5)×δ=0.3×10=3

[0089] The protective holster is a rectangular rubber plate whose length is slightly smaller than the inner diameter D to ensure that it is not too tight or too loose during assembly.

[0090] 3) Install the protective leather case:

[0091] 3.1. Pretreatment of the protective leather cover: first wash with metal detergent solution at 40℃ for 3min, then wash with 60℃ hot water for 10S, and then wash with cold water for 10S. The above is one cleaning cycle; repeat 2 cleaning cycles; then soak with tap water for 3mi; soak the protective leather cover with tap water for 5min to make the protective leather cover in a contracted state for easy assembly.

[0092] 3.2. Preheating of parts: Immerse the pre-plating treated parts in 60°C hot water for 3 minutes. Preheating of parts is to make the parts in a thermal expansion state for easy assembly.

[0093] 3.3. Install the protective leather case: Install the protective leather case as follows:

[0094] 3.3.1. For parts without step positioning reference in the axial direction: when installing the protective leather cover, first make a mark line on the inner wall at a position 18mm away from the stop at one end, then align one end of the protective leather cover with the mark line, fold the protective leather cover into a "3" shape from the middle, align the two ends, put it into the hot shell and unfold it, unfold the protective leather cover into a cylindrical shape, and make the protective leather cover fit the protective part of the inner wall;

[0095] 4) Absorb clean water: Soak the parts with the protective leather cover in a clean water tank at room temperature for 5 minutes to complete the local protection of the electroplating on the cylindrical inner wall of the parts. Soak the parts with the protective leather cover in a clean water tank at room temperature for 5 minutes to allow the edge gap between the protective leather cover and the non-electroplated surface to be filled with clean water to protect the parts from being corroded by other liquids.

[0096] 5) Remove the protective leather cover, use a bamboo knife made from a bamboo piece to aim at the lower leather surface at one end corner of the seam where the protective leather is to be removed, lift up the leather surface and pull it. Do not use metal knives to avoid scratching the surface coating of the parts.

[0097] 6) Clean the removed leather case with metal detergent solution at 35℃ for 3 minutes, then wash it with 50℃ hot water for 10S, and then wash it with cold water for 10S. The above is one cleaning cycle; repeat 2 cleaning cycles; then soak it in tap water for 3 minutes; and it can be used again.

Claims

1. A method for local protection electroplating of barrel inner wall, characterized in that: The following steps are involved: 1) Determine the size of the protected part of the barrel-shaped inner wall of the part: determine the axial length L and inner diameter R of the protected part according to the part drawing; 2) Make a protective leather case: Use acid and alkali resistant rubber to make a protective leather case. The leather case is a rectangular rubber plate. The circumference of the leather case is W = πR-S, S = (0.1~0.5) × δ; its width A = L; the thickness of the leather case δ is 6mm~10mm; the area of ​​the leather case is D = WL = (πR-S) × L. 3) Pretreatment of protective leather cover: first use metal detergent solution to clean at 35℃~45℃ for 3min~5min, then use hot water at 50℃~60℃ for 10S~20S, then use cold water for 10S~20S. The above is one cleaning cycle; repeat 2~3 cleaning cycles; then soak in tap water for 3min~5min; 4) Preheating of parts: Immerse the pre-plating treated parts in hot water at 60℃~70℃ for 3-5min; 5) Install the protective leather case; 6) Adsorption of clean water: Place the parts with the protective leather cover installed in a clean water tank at room temperature and soak for 5 to 10 minutes to complete the local protection of the electroplating of the cylindrical inner wall of the parts.

2. The method for local protection electroplating of barrel inner wall according to claim 1, characterized in that: The barrel-shaped inner wall protection is suitable for parts with an inner diameter R greater than 15 mm.

3. The method for local protection electroplating of barrel inner wall according to claim 1, characterized in that: When installing the protective leather cover, for parts with a step positioning reference in the axial direction, align one end with the step positioning reference of the part, unfold the protective leather cover into a cylindrical shape, and make the protective leather cover fit the protection part of the inner wall.

4. The method for local protection electroplating of barrel inner wall according to claim 1, characterized in that: When installing the protective leather cover, for parts without axial step positioning reference: when installing the protective leather cover, first make a marking line on the inner wall protection part, then align one end of the protective leather cover with the marking line, unfold the protective leather cover into a cylinder, and make the protective leather cover fit the inner wall protection part.

5. The method for local protection electroplating of barrel inner wall according to claim 1, characterized in that: When installing the protective leather cover, fold the protective leather into a "3" shape from the middle, align the two ends, put it into the hot shell and then unfold it.

6. The method for local protection electroplating of barrel inner wall according to claim 1, characterized in that: Remove the protective leather cover, use a bamboo knife made from a bamboo piece to aim at the lower leather surface at one end corner of the seam where the protective leather is to be removed, lift up the leather surface and pull it.

7. The method for local protection electroplating of barrel inner wall according to claim 1, characterized in that , install the protective leather cover, and absorb clean water at the seams and the edges of the upper and lower leather covers to seal the edge gaps and prepare for water filling. The inner diameter of the part is retained in the leather seam under the pressure of the rubber, the pressure of the end face of the rubber cover at the seam and the tension of the water itself, thereby achieving protection during the electroplating process.

8. The method for local protection electroplating of barrel inner wall according to claim 1, characterized in that , Clean the removed leather case with metal detergent solution at 35℃~45℃ for 3min~5min, then wash it with hot water at 50℃~60℃ for 10S~20S, and then wash it with cold water for 10S~20S. The above is one cleaning cycle; repeat 2~3 cleaning cycles; then soak it in tap water for 3min~5min; it can be used again.

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