Surface treatment method of engine cylinder head

Abstract

The present invention provides a method for treating the surface of an engine cylinder head. A method for treating the surface of an engine cylinder head is provided, which comprises soaking and vibrating the cylinder head to soften stains. A method for treating the surface of an engine cylinder head comprises a first soaking: a vibrator is installed in a soaking pool, and the engine cylinder head is placed in the soaking pool, the soaking pool contains 50L-1500L of water, and the water temperature in the soaking pool is controlled between -20℃-50℃, the soaking time is 15-60min, and during the soaking process, the engine cylinder head is vibrated by the vibrator. When the present invention places the engine cylinder head in the soaking pool, the engine cylinder head is vibrated by the vibrator, and the oil stains and stains on the engine cylinder head are softened after soaking, so as to facilitate the removal of stains on the engine cylinder head.

Description

Technical Field

[0001] The invention relates to the technical field of cylinder heads, and in particular to a surface treatment method for an engine cylinder head. Background Art

[0002] The engine cylinder head is a mechanical part of the automobile engine. For the surface treatment of the engine cylinder head, it is generally necessary to clean the stains on the engine cylinder head and then improve the performance of the engine cylinder head.

[0003] In the prior art, the surface treatment method for an engine cylinder head is generally the following steps: cleaning the oil stains on the cylinder head, polishing the cylinder head, and soaking and drying the cylinder head again. When treating the oil stains on the cylinder head, since the oil stains are difficult to clean, it is difficult to clean them when removing the oil stains and stains. Now, a surface treatment method for an engine cylinder head is developed, which soaks and vibrates the cylinder head to soften the stains. Summary of the invention

[0004] In order to overcome the disadvantage of the prior art that oil stain treatment is difficult, the technical problem to be solved is: to provide a surface treatment method for an engine cylinder head by soaking and vibrating the cylinder head to soften the stains.

[0005] A method for surface treatment of an engine cylinder head, comprising:

[0006] S1. First soaking: a vibrator is installed in the soaking tank, and the engine cylinder head is placed in the soaking tank. The soaking tank contains 50L-1500L of water, and the water temperature in the soaking tank is controlled between -20℃-50℃. The soaking time is 15-60min. During the soaking process, the engine cylinder head is vibrated by the vibrator;

[0007] S2, oil stain treatment: drain the water in the soaking tank in S1, rinse the stains in the soaking tank, spray the cleaning liquid evenly on the cylinder head, wait for 10-30 minutes, and use mechanical brushing to brush off the oil stains on the cylinder head to obtain the cylinder head after oil stain treatment;

[0008] S3, polishing treatment: fix the cylinder head with a polishing ball, evenly set at least 30 spray heads on the inner wall of the polishing ball, and use a jet pump to spray the polishing liquid into the polishing ball;

[0009] S4, second soaking: put the cylinder head polished in S3 into the soaking pool, fill the soaking pool with water, and use a vibrator to vibrate the cylinder head at the same time. The soaking time is 30-40 minutes, and then take out the cylinder head and rinse it clean;

[0010] S5, drying treatment: putting the cylinder head into a dryer for drying treatment, the drying time is 30-60 minutes, and the engine cylinder head after the treatment is obtained.

[0011] Furthermore, S2 specifically includes the following steps:

[0012] S2-1, cleaning soaking pool:

[0013] Drain the wastewater left in S1 and clean the stains in the soaking tank;

[0014] S2-2, prepare cleaning solution:

[0015] 14%-20% N-bis(hydroxyethyl)alkylamide, 8%-12% EDTA, 3.3%-5.2% AP type demulsifier, 30%-60% water are poured into the reactor, heated to 20-60°C, stirred at 310 rpm, and reacted for 10-20 min to produce a viscous liquid to obtain a high-strength cleaning solution.

[0016] S2-3, spray cleaning fluid:

[0017] The high-intensity cleaning liquid prepared in S2-2 is evenly sprayed onto the cylinder head by high-pressure spraying, and then allowed to stand for 10-30 minutes;

[0018] S2-4, Mechanical scrubbing:

[0019] Use mechanical brushing to brush off the oil stains on the cylinder head, and the brushing time is 20-30 minutes.

[0020] Furthermore, in S3, a rotating fixture is provided inside the polishing ball, and the cylinder head is clamped by the rotating fixture, and the cylinder head is rotated 360 degrees by the rotating fixture, and the rotation rate is 10-80 revolutions / min, and the injection speed of the injection pump is 34-42m / s, and the injection time is 42-53s.

[0021] Further, in S3, the preparation process of the polishing liquid is as follows:

[0022] S3-1. Ingredients:

[0023] Measure 20-120mL of hydrochloric acid, 33-50mL of nitric acid, 60-100mL of phosphoric acid and 700-900mL of water.

[0024] S3-2, raw material mixing:

[0025] Pour 20-120mL of hydrochloric acid, 33-50mL of nitric acid, 60-100mL of phosphoric acid and 700-900mL of water into a mixing machine, mix for 10-15min, raise the temperature to 20-30°C, and obtain a complex formed by an organic acid and base;

[0026] S3-3. Add auxiliary materials:

[0027] Add 20 mL of additive, 8 mL of inhibitor and 10 mL of corrosion inhibitor and mix them evenly. Add one auxiliary material every 3 minutes. The mixing time is 10-15 minutes to obtain an environmentally friendly metal polishing liquid. The pH value of the metal polishing liquid is between 8-10, and the corrosion to the cylinder head is small.

[0028] Furthermore, in S5, before the cylinder head is placed in the dryer, the cylinder head is wiped clean using a wiping machine, and the wiping part of the wiping machine is made of non-woven fabric.

[0029] Furthermore, it also includes S6, anti-corrosion treatment:

[0030] S6-1, pour 500ml-3000ml of electrolyte into the electrolytic cell, filling 2 / 3 of the space in the electrolytic cell;

[0031] S6-2, fix the cylinder head in the electrolytic cell, immerse the cylinder head in the electrolyte, and connect the positive electrode and the anode;

[0032] S6-3, turn on the power supply of the electrolytic cell, control the voltage at 70-100V, and adjust the electrolysis temperature from 20℃-120℃ to 80℃-300℃, the electrolysis time is 2-3.6 hours, and a protective film is formed on the surface of the cylinder head, which can form a protective layer for the cylinder head;

[0033] Furthermore, the protective film in S6 is an aluminum oxide ceramic layer with a thickness of 10 to 33 microns.

[0034] Furthermore, the cylinder head after the anti-corrosion treatment in S6 is placed in a cooling pool for cooling, the cooling temperature is -60°C-10°C, the cooling time is 50-90 minutes, and after cooling, the cylinder head is taken out for drying again.

[0035] The present invention has the following advantages: 1. When the engine cylinder head is placed in the soaking tank, the engine cylinder head is vibrated by a vibrator, and the oil stains and dirt on the engine cylinder head are softened by soaking, so that the dirt on the engine cylinder head can be removed;

[0036] 2. The present invention adopts a method of automatically rotating the cylinder head and spraying the polishing liquid with high pressure to automatically polish the cylinder head;

[0037] 3. When developing the polishing liquid, the present invention uses inorganic strong acid (hydrochloric acid, nitric acid and phosphoric acid) as the main material, and adds auxiliary materials (additives, inhibitors and corrosion inhibitors) to mix and develop an environmentally friendly metal polishing liquid, which effectively reduces the generation of toxic gases during the polishing process. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0039] Example 1

[0040] A method for surface treatment of an engine cylinder head, comprising:

[0041] S1. First soaking: a vibrator is installed in the soaking tank, and the engine cylinder head is placed in the soaking tank. The soaking tank contains 50L-1500L of water, and the water temperature in the soaking tank is controlled between -20℃-50℃. The soaking time is 15-60min. During the soaking process, the engine cylinder head is vibrated by the vibrator to shake off the stains on the engine cylinder head, and the oil stains and other stains on the engine cylinder head can be softened by soaking;

[0042] S2. Oil stain treatment:

[0043] S2-1, cleaning soaking pool:

[0044] Drain the wastewater left in S1 and clean the stains in the soaking tank;

[0045] S2-2, prepare cleaning solution:

[0046] 15% N-bis(hydroxyethyl)alkylamide, 9% EDTA, 4% AP type demulsifier and 40% water are poured into a reactor, heated to 20-60°C, stirred at 310 rpm, and reacted for 10-20 min to produce a viscous liquid, thereby obtaining a high-strength cleaning solution;

[0047] S2-3, spray cleaning fluid:

[0048] The high-intensity cleaning liquid prepared in S2-2 is evenly sprayed onto the cylinder head by high-pressure spraying, and then left to stand for 10-30 minutes. The oil stains on the cylinder head are first emulsified by the high-intensity cleaning liquid, which makes it easier to brush off the oil stains later.

[0049] S2-4, Mechanical scrubbing:

[0050] Use mechanical brushing to brush off the oil stains on the cylinder head, and the brushing time is 20-30 minutes.

[0051] S3. Polishing: Use a polishing ball to fix the cylinder head. A rotating clamp is set inside the polishing ball. Use the rotating clamp to clamp the cylinder head. The cylinder head is rotated 360 degrees by the rotating clamp. The rotation rate is 10-80 turns / min, and the injection speed of the jet pump is 34-42m / s. The injection time is 42-53s. At least 30 injection heads are evenly arranged on the inner wall of the polishing ball. Use a jet pump to spray the polishing liquid into the polishing ball. With the cooperation of pressure injection and rotation of the cylinder head, the cylinder head can be polished evenly to improve the polishing efficiency.

[0052] The production process of polishing liquid is as follows:

[0053] S3-1. Ingredients: Measure 20-120 mL of hydrochloric acid, 33-50 mL of nitric acid, 60-100 mL of phosphoric acid and 700-900 mL of water.

[0054] S3-2, raw material mixing: pour 20-120mL of hydrochloric acid, 33-50mL of nitric acid, 60-100mL of phosphoric acid and 700-900mL of water into a mixing machine, mix for 10-15min, raise the temperature to 20-30°C, and obtain a complex formed by an organic acid and base. The complex formed by the organic acid and base can achieve a good polishing effect;

[0055] S3-3. Add auxiliary materials: add 20 mL of additive, 8 mL of inhibitor, and 10 mL of corrosion inhibitor and mix them evenly. Add one auxiliary material every 3 minutes, and the mixing time is 10-15 minutes to obtain an environmentally friendly metal polishing liquid. The pH value of the metal polishing liquid is between 8-10, and the corrosion to the cylinder head is small.

[0056] S4, second soaking: put the cylinder head polished in S3 into the soaking pool, fill the soaking pool with water, and use a vibrator to vibrate the cylinder head at the same time. The soaking time is 30-40 minutes, and then take out the cylinder head and rinse it clean;

[0057] Example 2

[0058] Based on Example 1, a surface treatment method for an engine cylinder head includes:

[0059] S1. First soaking: a vibrator is installed in the soaking tank, and the engine cylinder head is placed in the soaking tank. The soaking tank contains 50L-1500L of water, and the water temperature in the soaking tank is controlled between -20℃-50℃. The soaking time is 15-60min. During the soaking process, the engine cylinder head is vibrated by the vibrator to shake off the stains on the engine cylinder head, and the oil stains and other stains on the engine cylinder head can be softened by soaking;

[0060] S2. Oil stain treatment:

[0061] S2-1, cleaning soaking pool:

[0062] Drain the wastewater left in S1 and clean the stains in the soaking tank;

[0063] S2-2, prepare cleaning solution:

[0064] 20% N-bis(hydroxyethyl)alkylamide, 10% EDTA, 5% AP type demulsifier and 50% water are poured into a reactor, heated to 20-60°C, stirred at 310 rpm, and reacted for 10-20 min to produce a viscous liquid, thereby obtaining a high-strength cleaning solution;

[0065] S2-3, spray cleaning fluid:

[0066] The high-intensity cleaning liquid prepared in S2-2 is evenly sprayed onto the cylinder head by high-pressure spraying, and then left to stand for 10-30 minutes. The oil stains on the cylinder head are first emulsified by the high-intensity cleaning liquid, which makes it easier to brush off the oil stains later.

[0067] S2-4, Mechanical scrubbing:

[0068] Use mechanical brushing to brush off the oil stains on the cylinder head, and the brushing time is 20-30 minutes.

[0069] S3. Polishing: Use a polishing ball to fix the cylinder head. A rotating clamp is set inside the polishing ball. Use the rotating clamp to clamp the cylinder head. The cylinder head is rotated 360 degrees by the rotating clamp. The rotation rate is 10-80 turns / min, and the injection speed of the jet pump is 34-42m / s. The injection time is 42-53s. At least 30 injection heads are evenly arranged on the inner wall of the polishing ball. Use a jet pump to spray the polishing liquid into the polishing ball. With the cooperation of pressure injection and rotation of the cylinder head, the cylinder head can be polished evenly to improve the polishing efficiency.

[0070] The production process of polishing liquid is as follows:

[0071] S3-1. Ingredients: Measure 20-120 mL of hydrochloric acid, 33-50 mL of nitric acid, 60-100 mL of phosphoric acid and 700-900 mL of water.

[0072] S3-2, raw material mixing: pour 20-120mL of hydrochloric acid, 33-50mL of nitric acid, 60-100mL of phosphoric acid and 700-900mL of water into a mixing machine, mix for 10-15min, raise the temperature to 20-30°C, and obtain a complex formed by an organic acid and base. The complex formed by the organic acid and base can achieve a good polishing effect;

[0073] S3-3. Add auxiliary materials: add 20 mL of additive, 8 mL of inhibitor, and 10 mL of corrosion inhibitor and mix them evenly. Add one auxiliary material every 3 minutes, and the mixing time is 10-15 minutes to obtain an environmentally friendly metal polishing liquid. The pH value of the metal polishing liquid is between 8-10, and the corrosion to the cylinder head is small.

[0074] S4, second soaking: put the cylinder head polished in S3 into the soaking pool, fill the soaking pool with water, and use a vibrator to vibrate the cylinder head at the same time. The soaking time is 30-40 minutes, and then take out the cylinder head and rinse it clean;

[0075] S5, drying treatment: wipe the cylinder head with a wiper, the wiping part of the wiper is made of non-woven fabric, and put the cylinder head into a dryer for drying, the drying time is 30-60 minutes, and the engine cylinder head after the treatment is obtained;

[0076] S6. Anticorrosion treatment:

[0077] S6-1, pour 500ml-3000ml of electrolyte into the electrolytic cell, filling 2 / 3 of the space in the electrolytic cell;

[0078] S6-2, fix the cylinder head in the electrolytic cell, immerse the cylinder head in the electrolyte, and connect the positive electrode and the anode;

[0079] S6-3. Turn on the power supply of the electrolytic cell, control the voltage at 70-100V, and adjust the electrolysis temperature from 20℃-120℃ to 80℃-300℃. The electrolysis time is 2-3.6 hours. A layer of aluminum oxide ceramic layer with a thickness of 10-33 microns is formed on the surface of the cylinder head. The aluminum oxide ceramic layer can form a protective layer for the cylinder head to prevent corrosion of the cylinder head. The cylinder head after anti-corrosion treatment is placed in a cooling pool for cooling. The cooling temperature is -60℃-10℃ and the cooling time is 50-90min. After cooling, take out the cylinder head and dry it again.

[0080] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for surface treatment of an engine cylinder head, characterized in that: Included are: S1. First soaking: a vibrator is installed in the soaking tank, and the engine cylinder head is placed in the soaking tank. The soaking tank contains 50L-1500L of water, and the water temperature in the soaking tank is controlled between -20℃-50℃. The soaking time is 15-60min. During the soaking process, the engine cylinder head is vibrated by the vibrator; S2, oil stain treatment: drain the water in the soaking tank in S1, rinse the stains in the soaking tank, spray the cleaning liquid evenly on the cylinder head, wait for 10-30 minutes, and use mechanical brushing to brush off the oil stains on the cylinder head to obtain the cylinder head after oil stain treatment; S3, polishing treatment: fix the cylinder head with a polishing ball, evenly set at least 30 spray heads on the inner wall of the polishing ball, and use a jet pump to spray the polishing liquid into the polishing ball; S4, second soaking: put the cylinder head polished in S3 into the soaking pool, fill the soaking pool with water, and use a vibrator to vibrate the cylinder head at the same time. The soaking time is 30-40 minutes, and then take out the cylinder head and rinse it clean; S5, drying treatment: putting the cylinder head into a dryer for drying treatment, the drying time is 30-60 minutes, and the engine cylinder head after the treatment is obtained; S2 specifically includes the following steps: S2-1, cleaning soaking pool: Drain the wastewater left in S1 and clean the stains in the soaking tank; S2-2, prepare cleaning solution: 14%-20% N-bis(hydroxyethyl)alkylamide, 8%-12% EDTA, 3.3%-5.2% AP type demulsifier, 30%-60% water are poured into the reactor, heated to 20-60°C, stirred at 310 rpm, and reacted for 10-20 min to produce a viscous liquid to obtain a high-strength cleaning solution. S2-3, spray cleaning fluid: The high-intensity cleaning liquid prepared in S2-2 is evenly sprayed onto the cylinder head by high-pressure spraying, and then allowed to stand for 10-30 minutes; S2-4, Mechanical scrubbing: Use mechanical brushing to brush off the oil stains on the cylinder head. The brushing time is 20-30 minutes. In S3, a rotating fixture is provided inside the polishing ball, and the cylinder head is clamped by the rotating fixture. The cylinder head is rotated 360 degrees by the rotating fixture, and the rotation rate is 10-80 revolutions / min. The injection speed of the injection pump is 34-42m / s, and the injection time is 42-53s.

2. The method for surface treatment of an engine cylinder head according to claim 1, wherein in S3, the preparation process of the polishing liquid is as follows: S3-1. Ingredients: Measure 20-120mL of hydrochloric acid, 33-50mL of nitric acid, 60-100mL of phosphoric acid and 700-900mL of water. S3-2, raw material mixing: Pour 20-120mL of hydrochloric acid, 33-50mL of nitric acid, 60-100mL of phosphoric acid and 700-900mL of water into a mixing machine, mix for 10-15min, raise the temperature to 20-30°C, and obtain a complex formed by an organic acid and base; S3-3. Add auxiliary materials: Add 20 mL of additive, 8 mL of inhibitor and 10 mL of corrosion inhibitor and mix them evenly. Add one auxiliary material every 3 minutes. The mixing time is 10-15 minutes to obtain an environmentally friendly metal polishing liquid. The pH value of the metal polishing liquid is between 8-10, and the corrosion to the cylinder head is small.

3. A method for surface treatment of an engine cylinder head according to claim 2, characterized in that, in S5, before putting the cylinder head into the dryer, the cylinder head is wiped clean with a wiper, and the wiping part of the wiper is made of non-woven fabric.

4. A method for surface treatment of an engine cylinder head according to claim 3, characterized in that: Also includes S6, anti-corrosion treatment: S6-1, pour 500ml-3000ml of electrolyte into the electrolytic cell, filling 2 / 3 of the space in the electrolytic cell; S6-2, fix the cylinder head in the electrolytic cell, immerse the cylinder head in the electrolyte, and connect the positive electrode and the anode; S6-3. Turn on the power supply of the electrolytic cell, control the voltage at 70-100V, and adjust the electrolysis temperature from 20℃-120℃ to 80℃-300℃. The electrolysis time is 2-3.6 hours. A protective film is formed on the surface of the cylinder head. The protective film can form a protective layer for the cylinder head.

5. A method for surface treatment of an engine cylinder head according to claim 4, characterized in that: The protective film in S6 is an aluminum oxide ceramic layer with a thickness of 10 to 33 microns.

6. A method for surface treatment of an engine cylinder head according to claim 5, characterized in that: The cylinder head treated with anti-corrosion in S6 is placed in a cooling pool for cooling at a temperature of -60°C to 10°C for a cooling time of 50-90 minutes. After cooling, the cylinder head is taken out for drying again.