Medium for micro-surface treatment of cylinder sleeve and preparation method of medium

Abstract

The invention relates to the technical field of cylinder sleeve manufacturing, in particular to a medium for micro-surface treatment of a cylinder sleeve and a preparation method of the medium. The medium for micro-surface treatment of the cylinder sleeve, provided by the invention, is prepared from sodium bentonite, green silicon carbide, C12-18 fatty alcohol polyoxyethylene (25) ether, lignosulfonate, polyaniline and water according to a certain proportion, and the medium can be used for changing a common electrochromism surface into a loose-hole chromism surface in a mechanical extrusion manner; the method ensures that the inner surface of the engine cylinder sleeve has good oil storage performance, ensures that the cylinder sleeve with the chromium-plated inner hole has good lubricity during operation of an engine, is good in process operability, and improves the productivity and the qualification rate of the cylinder sleeve.

Description

Technical Field

[0001] The invention relates to the technical field of cylinder liner manufacturing, and in particular to a medium for cylinder liner micro-surface treatment and a preparation method thereof. Background Art

[0002] The cylinder liner is a cylindrical part that is placed in the cylinder hole of the engine body and is fixed by the cylinder head. The piston reciprocates in its inner hole and is cooled by cooling water. The cylinder liner, cylinder head and piston together form the working space of the cylinder.

[0003] There are more and more clean fuel engines. For engines that use methanol and ammonia as clean fuels, the traditional engine cylinder liner materials have poor corrosion resistance and are suffering from increasingly serious corrosion and wear. Technologies such as chrome plating and nickel-phosphorus plating on the inner hole of the cylinder liner are gradually being used. However, the inner wall of the cylinder liner has an extremely high hardness after chrome plating and nickel plating, and the traditional honing process cannot grind out a suitable mesh pattern on the inner surface of the cylinder liner. Some companies add silicon carbide and corundum powder to kerosene and honing oil as surface treatment media, and squeeze the inner hole of the cylinder liner through honing to achieve loose-pore chrome plating by electroplating chrome on the inner wall of the cylinder liner. However, since silicon carbide and corundum powder are very easy to precipitate in liquids, the process operability is poor, the quality of the inner hole of the cylinder liner after processing is extremely unstable, the scrap rate is extremely high, the cost is high, and it cannot be mass-produced, and the process is not easy to promote. Summary of the invention

[0004] In view of this, the present invention provides a medium for cylinder liner micro-surface treatment and a preparation method thereof. The medium provided by the present invention can realize the transformation of ordinary electroplated chrome surface into loose-pored chrome surface by mechanical extrusion, ensure that the inner surface of the engine cylinder liner has good oil storage capacity, ensure that the inner-pored chrome-plated cylinder liner has good lubricity during engine operation, and has good process operability, thereby improving the productivity and qualified rate of the cylinder liner.

[0005] The present invention provides a medium for cylinder liner micro-surface treatment, which comprises the following components in terms of mass percentage:

[0006]

[0007]

[0008] Preferably, the following components are included in percentage by mass:

[0009]

[0010] Preferably, the green silicon carbide has a particle size of 230-400 meshes and a purity of not less than 95%.

[0011] Preferably, the green silicon carbide has a particle size of 270-325 meshes and a purity of not less than 97%.

[0012] Preferably, its specific gravity is 1.26-1.40 g / cm 3 .

[0013] Preferably, its specific gravity is 1.28-1.35 g / cm 3 .

[0014] The present invention also provides a method for preparing the medium for cylinder liner micro-surface treatment described in the above technical solution, comprising:

[0015] Water, sodium bentonite, green silicon carbide, C 12-18 Fatty alcohol polyoxyethylene (25) ether, lignin sulfonate and polyaniline are mixed to obtain a medium for cylinder liner micro-surface treatment.

[0016] Preferably, the method comprises the following steps:

[0017] A) stirring and mixing water and sodium bentonite;

[0018] B) adding green silicon carbide and stirring and mixing;

[0019] C) Join C 12-18 Fatty alcohol polyoxyethylene (25) ether, lignin sulfonate and polyaniline are stirred and mixed to obtain a medium for cylinder liner micro-surface treatment.

[0020] Preferably, in step A), stirring is performed until the particle size of the sodium bentonite is dispersed to the nanometer level.

[0021] Preferably, in step A), the stirring is high-speed stirring; the speed of the high-speed stirring is 1000-1200 rpm, and the time is more than 3 hours;

[0022] In step B), the stirring is low-speed stirring; the rotation speed of the low-speed stirring is 150-250 rpm, and the time is more than 1 hour.

[0023] The present invention provides a medium for cylinder liner micro-surface treatment, which comprises sodium bentonite, green silicon carbide, C 12-18 The invention is prepared by mixing fatty alcohol polyoxyethylene (25) ether, lignin sulfonate, polyaniline and water in a certain proportion. All raw materials are non-toxic, environmentally friendly, and scientifically formulated. The invention has the advantages of suspension, lubricity, cooling, cleaning, rust prevention, stable viscosity, etc. The invention is convenient for deep processing of the inner hole plating of the cylinder liner, has stable processing quality, is suitable for industrial mass production, etc. The invention solves the technical problem of unstable quality of the inner hole surface layer of the cylinder liner after extrusion treatment, ensures the internal quality of the inner hole loose chrome-plated cylinder liner, improves productivity and qualified rate, and reduces the manufacturing cost of the cylinder liner of the new energy engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0025] Figure 1 This is the surface microstructure of the inner hole of the chrome-plated cylinder liner before extrusion;

[0026] Figure 2 This is the surface microstructure diagram after the inner hole of the chrome-plated cylinder liner is squeezed by the medium. DETAILED DESCRIPTION

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0028] In this article, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0029] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0030] Herein, when it comes to numerical ranges, unless otherwise specified, the numerical ranges are deemed to be continuous and include the minimum and maximum values ​​of the range, as well as every value between such minimum and maximum values. Further, when a range refers to an integer, every integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges included therein.

[0031] In this article, when referring to the units of a data range, if only the right endpoint is followed by a unit, it means that the units of the left and right endpoints are the same.

[0032] Only some numerical ranges are specifically disclosed herein. However, any lower limit can be combined with any upper limit to form an unspecified range; and any lower limit can be combined with other lower limits to form an unspecified range, and likewise any upper limit can be combined with any other upper limit to form an unspecified range. In addition, each separately disclosed point or single value can itself be combined as a lower limit or upper limit with any other point or single value or with other lower limits or upper limits to form an unspecified range.

[0033] The present invention provides a medium for cylinder liner micro-surface treatment, which comprises the following components in terms of mass percentage:

[0034]

[0035] In the present invention, the source of the sodium bentonite is not particularly limited, and it can be a commercial product. In the present invention, the content of the sodium bentonite is 1.5% to 2.5%, specifically 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, and more preferably 1.9% to 2.1%.

[0036] In the present invention, the particle size of the green silicon carbide is preferably 230-400 mesh, more preferably 270-325 mesh. The purity of the green silicon carbide is preferably not less than 95%, more preferably not less than 97%. The present invention has no special restrictions on the source of the green silicon carbide, and it can be a commercial product. In the present invention, the content of the green silicon carbide is 32% to 35%, specifically 32%, 33%, 34%, 35%, more preferably 33% to 34%.

[0037] In the present invention, the C 12-18 The structural formula of fatty alcohol polyoxyethylene (25) ether is C 12～18 H 25～37 O(CH 2 CH 2 0) 25 H, from 1 mol C 12-18 The fatty alcohol is prepared by condensing, neutralizing and decolorizing with 25 mol of ethylene oxide under solid base catalysis. 12-18 The source of fatty alcohol polyoxyethylene (25) ether is not particularly limited and can be a commercial product. 12-18 The content of fatty alcohol polyoxyethylene (25) ether is 1.5% to 2.5%, specifically 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, more preferably 1.8% to 2.2%.

[0038] In the present invention, the lignin sulfonate is preferably sodium lignin sulfonate. The present invention has no special restrictions on the source of the lignin sulfonate, and it can be a commercial product. In the present invention, the content of the lignin sulfonate is 0.5% to 1.0%, specifically 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%.

[0039] In the present invention, the source of the polyaniline is not particularly limited, and it can be a commercial product. In the present invention, the content of the polyaniline is 0.5% to 1.0%, specifically 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%.

[0040] In the present invention, the amount of water used is the balance, that is, it makes up 100%.

[0041] In the present invention, the specific gravity of the medium for cylinder liner micro-surface treatment is preferably 1.26 to 1.40 g / cm 3 , more preferably 1.28 to 1.35 g / cm 3 .

[0042] The medium for micro-surface treatment of cylinder sleeves provided by the present invention is mainly used for inner hole processing of inner hole chrome-plated, nickel-plated or nickel-phosphorus-plated cylinder sleeves, and is specifically an intermediate medium for deep processing of the microscopic morphology of the inner hole surface of chrome-plated, nickel-plated or nickel-phosphorus-plated cylinder sleeves. It is used for deep processing of the chrome-plated, nickel-plated or nickel-phosphorus-plated surface of the cylinder sleeve, and a special grinding head is used on a honing machine to perform deep processing on the coating through the above medium, so that micro cracks are generated on the coating surface, thereby improving the oil storage capacity of the inner wall of the cylinder sleeve and improving its lubricity.

[0043] The medium for cylinder liner micro-surface treatment provided by the present invention has stable liquid quality and low cost. The green silicon carbide powder is evenly suspended in the medium and stably flows to the inner wall of the cylinder liner through the liquid pump. The extrusion plate on the honing head squeezes the inner wall of the cylinder liner through the medium, which is equivalent to applying force to the inner wall coating of the cylinder liner through countless evenly dispersed hard points, and the coating surface is subjected to force and cracks occur (such as Figure 2 As shown in the figure, the smooth coating surface has a suitable roughness due to the force, so that it has good oil storage capacity, ensuring the reliable lubrication of the cylinder liner during operation. At the same time, the water-based liquid, in combination with the above components, prevents the cylinder liner and equipment from corrosion and rust during the processing.

[0044] The present invention also provides a method for preparing the medium for cylinder liner micro-surface treatment described in the above technical solution, comprising:

[0045] Water, sodium bentonite, green silicon carbide, C 12-18 Fatty alcohol polyoxyethylene (25) ether, lignin sulfonate and polyaniline are mixed to obtain a medium for cylinder liner micro-surface treatment.

[0046] Wherein, the water, sodium bentonite, green silicon carbide, C 12-18 The types and amounts of fatty alcohol polyoxyethylene (25) ether, lignin sulfonate and polyaniline are consistent with those described in the previous technical solution and will not be described in detail here.

[0047] In the present invention, the above preparation method preferably specifically comprises the following steps:

[0048] A) stirring and mixing water and sodium bentonite;

[0049] B) adding green silicon carbide and stirring and mixing;

[0050] C) Join C 12-18 Fatty alcohol polyoxyethylene (25) ether, lignin sulfonate and polyaniline are stirred and mixed to obtain a medium for cylinder liner micro-surface treatment.

[0051] In step A), the stirring is preferably high-speed stirring. The stirring speed is preferably 1000-1200 rpm, specifically 1000 rpm, 1100 rpm, 1200 rpm. The stirring time is preferably more than 3 hours, more preferably 3-4 hours, specifically 3 hours, 4 hours. The stirring and mixing is performed until the particle size of the sodium bentonite is dispersed to the nanometer level. The stirring and mixing can be performed in a centrifugal disperser.

[0052] In step B), the stirring is preferably low-speed stirring. The stirring speed is preferably 150-250 rpm, specifically 150 rpm, 200 rpm, 250 rpm. The stirring time is preferably more than 1 hour, more preferably 1-2 hours, specifically 1 hour, 2 hours.

[0053] In step C): after the stirring and mixing in step B) is completed, add C 12-18 Fatty alcohol polyoxyethylene (25) ether, lignin sulfonate and polyaniline are stirred and mixed. The stirring speed is preferably 150-250 rpm, specifically 150 rpm, 200 rpm, 250 rpm. The stirring time is preferably 10-20 min, specifically 10 min, 15 min, 20 min. After the above treatment, a water-based medium is obtained, i.e., a medium for cylinder liner micro-surface treatment.

[0054] The medium for cylinder liner micro-surface treatment provided by the present invention has non-toxic raw materials, is environmentally friendly, has a scientific formula, has the advantages of suspension, lubricity, cooling, cleaning, rust resistance, stable viscosity, etc., is convenient for deep processing of the cylinder liner inner hole plating, has stable processing quality, is suitable for industrial mass production, etc., solves the technical problem of unstable quality of the cylinder liner inner hole surface layer after extrusion treatment, ensures the internal quality of the loose inner hole chrome-plated cylinder liner, improves production volume and qualified rate, and reduces the manufacturing cost of the cylinder liner of new energy engines.

[0055] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0056] If no specific experimental steps or conditions are specified in the examples, the conventional experimental steps or conditions described in the literature in the art can be used. If no manufacturer is specified for the reagents or instruments used, they are all conventional reagent products that can be obtained commercially, and the raw materials used are all raw materials that meet national standards or supplier standards.

[0057] Example 1

[0058] To prepare 50 kg of medium:

[0059] A) 29 kg (58%) of water was measured and added to a centrifugal disperser. The disperser was started to stir at high speed, and 1.25 kg (2.5%) of sodium bentonite was added. The mixture was stirred at 1000 rpm for 3 h.

[0060] B) Add 17.5 kg (35%) green silicon carbide (particle size 250-300 mesh, purity 97%) and stir at a low speed of 200 rpm for 70 minutes.

[0061] C) Add C 12-18 1.25 kg (2.5%) of fatty alcohol polyoxyethylene (25) ether, 0.5 kg (1.0%) of sodium lignin sulfonate and 0.5 kg (1.0%) of polyaniline were stirred at 150 rpm for 15 minutes to obtain a medium for cylinder liner micro-surface treatment. Its specific gravity was 1.33 g / cm 3 .

[0062] Example 2

[0063] To prepare 50 kg of medium:

[0064] A) 31.5 kg (63%) of water was measured and added to a centrifugal disperser. The disperser was started to stir at high speed, and 0.75 kg (1.5%) of sodium bentonite was added. The mixture was stirred at 1000 rpm for 200 min.

[0065] B) Add 16 kg (32%) green silicon carbide (particle size 250-300 mesh, purity 97.2%) and stir at a low speed of 200 rpm for 100 min.

[0066] C) Add C 12-18 0.75 kg (1.5%) of fatty alcohol polyoxyethylene (25) ether, 0.25 kg (0.5%) of sodium lignin sulfonate and 0.25 kg (0.5%) of polyaniline were stirred at 150 rpm for 10 minutes to obtain a medium for cylinder liner micro-surface treatment. Its specific gravity was 1.29 g / cm 3 .

[0067] Example 3

[0068] To prepare 100 kg of medium:

[0069] A) 61 kg (61%) of water was measured and added to a centrifugal disperser. The disperser was started to stir at high speed, and 2.0 kg (2.0%) of sodium bentonite was added. The mixture was stirred at 1200 rpm for 3 h.

[0070] B) Add 33.5 kg (33.5%) green silicon carbide (particle size 270-325 mesh, purity 97.2%) and stir at a low speed of 200 rpm for 60 minutes.

[0071] C) Add C 12-18 2.0 kg (2.0%) of fatty alcohol polyoxyethylene (25) ether, 0.75 kg (0.75%) of sodium lignin sulfonate and 0.75 kg (0.75%) of polyaniline were stirred at 150 rpm for 20 minutes to obtain a medium for cylinder liner micro-surface treatment. Its specific gravity was 1.30 g / cm 3 .

[0072] Comparative Example 1

[0073] Traditional extrusion process formula:

[0074] 40 kg of kerosene and 60 kg of silicon carbide are placed in a centrifugal disperser and stirred at high speed to obtain a medium.

[0075] test:

[0076] (1) The medium of Example 1 was used to process the chrome-plated cylinder liner with a 130 inner hole, and the microstructure of the inner hole of the chrome-plated cylinder liner before and after the extrusion treatment was characterized. Figure 1-2 ,in, Figure 1 This is the surface microstructure of the chrome-plated cylinder liner before extrusion. Figure 2 The surface microstructure of the inner hole of the chrome-plated cylinder sleeve after being squeezed by the medium. It can be seen that the surface of the microstructure is obviously rough after squeezing by the medium of the present invention, and the ordinary electroplated chrome surface is transformed into a loose-pored chrome surface, and the oil storage effect is better.

[0077] (2) The media of Examples 1-3 and Comparative Example 1 were used to process 130 inner bore chrome-plated cylinder liners, respectively. The production and use effects of inner bore extrusion are shown in Table 1.

[0078] Table 1: Effects of Examples 1-3 and Comparative Example 1

[0079]

[0080] It can be seen that by using the cylinder liner micro-surface treatment medium of the present invention, the production efficiency is doubled, and the product qualification rate is increased from the original 83.9% to 100%.

[0081] Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas, including the best mode, and also enable any technician in the field to practice the present invention, including making and using any device or system, and implementing any combined method. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention. The scope of patent protection of the present invention is defined by the claims and may include other embodiments that can be thought of by those skilled in the art. If these other embodiments have structural elements similar to the literal expression of the claims, or if they include equivalent structural elements that are not substantially different from the literal expression of the claims, then these other embodiments should also be included in the scope of the claims.

Claims

1. A medium for cylinder liner micro-surface treatment, characterized in that: In terms of mass percentage, it includes the following components:

2. The cylinder liner micro-surface treatment medium according to claim 1, characterized in that: In terms of mass percentage, it includes the following components:

3. The cylinder liner micro-surface treatment medium according to claim 1 or 2, characterized in that: The green silicon carbide has a particle size of 230-400 meshes and a purity of not less than 95%.

4. The cylinder liner micro-surface treatment medium according to claim 1 or 2, characterized in that: The green silicon carbide has a particle size of 270-325 meshes and a purity of not less than 97%.

5. The cylinder liner micro-surface treatment medium according to claim 1 or 2, characterized in that: Its specific gravity is 1.26~1.40g / cm 3 .

6. The cylinder liner micro-surface treatment medium according to claim 1 or 2, characterized in that: Its specific gravity is 1.28~1.35g / cm 3 .

7. A method for preparing a medium for cylinder liner micro-surface treatment according to any one of claims 1 to 6, characterized in that: include: Water, sodium bentonite, green silicon carbide, C 12-18 Fatty alcohol polyoxyethylene (25) ether, lignin sulfonate and polyaniline are mixed to obtain a medium for cylinder liner micro-surface treatment.

8. The preparation method according to claim 7, characterized in that: The following steps are involved: A) stirring and mixing water and sodium bentonite; B) adding green silicon carbide and stirring and mixing; C) Join C 12-18 Fatty alcohol polyoxyethylene (25) ether, lignin sulfonate and polyaniline are stirred and mixed to obtain a medium for cylinder liner micro-surface treatment.

9. The preparation method according to claim 8, characterized in that: In step A), stirring is performed until the particle size of the sodium bentonite is dispersed to the nanometer level.

10. The preparation method according to claim 8 or 9, characterized in that: In step A), the stirring is high-speed stirring; the speed of the high-speed stirring is 1000-1200 rpm, and the time is more than 3 hours; In step B), the stirring is low-speed stirring; the rotation speed of the low-speed stirring is 150-250 rpm, and the time is more than 1 hour.

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