CN109605968B - Process for improving thickness of graphite screen printing coating of aluminum piston - Google Patents
Process for improving thickness of graphite screen printing coating of aluminum piston Download PDFInfo
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- CN109605968B CN109605968B CN201811303092.5A CN201811303092A CN109605968B CN 109605968 B CN109605968 B CN 109605968B CN 201811303092 A CN201811303092 A CN 201811303092A CN 109605968 B CN109605968 B CN 109605968B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/12—Stencil printing; Silk-screen printing
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Abstract
The invention discloses a process for improving the thickness of a graphite screen printing coating of an aluminum piston, which comprises the following steps of: degreasing by using a degreasing agent, cleaning by using pure water, drying, keeping the temperature of a piston constant, printing graphite, drying, repeatedly printing, leveling and heating for curing, and improving the thickness of the graphite screen printing coating of the aluminum piston in a secondary printing mode when the graphite coating is just dried or the edge of the graphite coating is hardened under the condition that the temperature of the piston constant is 35-45 ℃. The invention has the beneficial effects that: by adopting a repeated printing mode, when all the coatings are just dried or the edges of the coatings are hardened, the thickness of the graphite coating is increased by printing for the second time, and the surface of the graphite coating is smooth and does not influence the appearance and the graphite adhesive force; the drying temperature and the constant temperature of the piston are increased to ensure that the printing paper can be dried quickly after the first printing; the piston temperature is increased, and the leveling time can be appropriately shortened.
Description
Technical Field
The invention relates to a part treatment process, in particular to a process for improving the thickness of an aluminum piston graphite screen printing coating, which is particularly suitable for the aluminum piston graphite screen printing requiring the thickness of the coating to be 0.015-0.03 mm.
Background
The coating thickness requirement for aluminum piston graphite screen printing in the industry is generally 0.01mm-0.02 mm. The prior art of the screen printing of the aluminum piston graphite comprises the following steps: cleaning and drying, graphite printing and leveling and curing, and the specific process and operation are as follows:
the graphite coating is used for early running-in lubrication and needs a certain thickness and adhesive force, and more customers at present require that the thickness of the graphite screen printing coating reaches 0.015-0.03 mm.
The main ways of increasing the thickness of the graphite screen printing coating in the prior art are as follows:
1. reducing the printing pressure;
2. increasing the distance between the silk screen and the printing workpiece;
3. increasing the included angle between the scraper and the silk screen;
4. increasing the wire diameter of the silk screen and the thickness of the photosensitive film;
5. the mesh number of the silk screen is reduced.
However, the following disadvantages exist in the above manner:
1. increasing the distance between the screen and the printing work piece, and increasing the included angle between the squeegee and the screen is also a way to reduce the printing pressure. The thickness of the graphite coating can be increased by properly reducing the pressure to leave enough space, but the increase is small and generally does not exceed 0.005mm, and the operation has great difficulty and risk, and the thickness of the graphite coating is reduced due to too low pressure which causes no printing.
2. Increase silk screen line footpath and photosensitive resist layer thickness and increased the length that the graphite was stayed in the silk screen hole storage, increased the diameter in silk screen hole when reducing the silk screen mesh number, all be through increasing the volume that reserves graphite, graphite permeates the quantity that the silk screen coated on the piston during the guarantee printing to increase the coating thickness, the thickness that this kind of mode increased is generally no longer than 0.007mm, and silk screen line footpath increase and mesh reduce in addition, can lead to the graphite coating to become coarse, influence the outward appearance, influence graphite adhesive force even.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a process for improving the thickness of an aluminum piston graphite screen printing coating, which can improve the thickness of the aluminum piston graphite screen printing coating, has smooth graphite coating surface, does not influence the appearance and the graphite adhesive force.
The purpose of the invention is realized by the following technical scheme: a process for improving the thickness of a screen printing coating of graphite of an aluminum piston comprises the following steps:
s1, cleaning and drying;
s11, degreasing by using a degreasing agent: degreasing the surface to be machined of the aluminum piston by using a degreasing agent;
s12, pure water cleaning: after degreasing by the degreasing agent, cleaning the surface to be machined of the aluminum piston by using pure water;
s13, drying: after pure water cleaning, drying the aluminum piston at the drying temperature of 45-65 ℃;
s2, graphite printing, comprising the following substeps;
s21, piston constant temperature: keeping the aluminum piston at a constant temperature, wherein the constant temperature of the aluminum piston is 35-45 ℃;
s22, first printing: performing graphite screen printing on the aluminum piston on the premise that the piston is constant in temperature;
s23, drying: drying the coating on the aluminum piston;
s24, second printing: when all coatings printed by the graphite in the step S22 are just dried or the edges of the coating layer are hardened, printing for the second time on the basis of the coatings;
s3, leveling and curing, wherein the leveling and curing method comprises the following substeps;
s31, leveling the coating;
and S32, heating and curing.
Preferably, the environmental humidity of the graphite screen printing in the step S22 is less than or equal to 50%. .
Preferably, the drying in step S23 is natural drying.
Preferably, the heating and curing temperature in the step S32 is 180-210 ℃, and the time is 30-50 minutes.
Preferably, the leveling time of step S31 is 5-15 minutes.
The invention has the following advantages:
1. by adopting a repeated printing mode, when all the coatings are just dried or the edges of the coatings are hardened, the thickness of the graphite coating is increased by printing for the second time, and the surface of the graphite coating is smooth and does not influence the appearance and the graphite adhesive force;
2. the drying temperature and the constant temperature of the piston are increased to ensure that the printing paper can be dried quickly after the first printing; the piston temperature is increased, and the leveling time can be appropriately shortened.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a graph showing the relationship between the degree of dryness of a graphite coating and the effect of repeated printing;
FIG. 3 is a graph showing the relationship between the degree of dryness of a graphite coating and the effect of repeated printing;
FIG. 4 is a graph showing the relationship between the degree of dryness of a graphite coating and the effect of repeated printing
FIG. 5 is a graph showing the relationship between the drying degree of the graphite coating and the effect of repeated printing at different drying temperatures.
Detailed Description
To further clarify the technical measures and effects of the present invention adopted to achieve the intended advantages of the present invention, the following detailed description is given with reference to the accompanying drawings and preferred embodiments of the present invention. In the following description, different "one embodiment" or "an embodiment" may not necessarily refer to the same embodiment, and furthermore, particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments:
specific example 1: graphite screen printing was performed at a piston constant temperature of 35 ℃, comprising the following steps:
s1, cleaning and drying;
s11, degreasing by using a degreasing agent: degreasing the surface to be machined of the aluminum piston by using a degreasing agent;
s12, pure water cleaning: after degreasing by the degreasing agent, cleaning the surface to be machined of the aluminum piston by using pure water;
s13, drying: after pure water cleaning, drying the aluminum piston at the drying temperature of 45-65 ℃;
s2, graphite printing;
s21, piston constant temperature: maintaining the aluminum piston at a constant temperature, wherein the constant temperature of the aluminum piston is 35 ℃;
s22, first printing: on the premise of keeping the piston at a constant temperature, performing graphite screen printing on the aluminum piston, wherein the environmental humidity is less than or equal to 50%;
s23, drying: naturally drying the coating on the aluminum piston;
s24, second printing: when all the coatings printed by the graphite in the step S22 are just dried, repeating the printing on the basis of the coatings;
s3, leveling and curing;
s31, leveling the coating: the leveling time is 5-15 minutes;
s32, heating and curing: the temperature of heating and curing is 180-210 ℃, and 30-50 minutes are needed.
Drying time of the graphite coating:
by adopting the process, the graphite screen printing is carried out at the piston temperature of 35 ℃, and the drying speed of the graphite coating is as shown in the following table 1:
table 1: drying time of graphite coating when piston temperature is 35 DEG C
| Piston temperature | 35℃ |
| Drying time of the coating on the periphery: min | 9 |
| Half of the coating drying time: min | 11.6 |
| Time to complete coating freshly dry: min | 15.2 |
| Drying hardening time of all coatings: min | 24 |
Degree of drying of graphite coating and effect of repeated printing
By adopting the process, the graphite screen printing is carried out at the piston temperature of 35 ℃, and the relationship between the thickness of the coating and the adhesion effect of repeated printing and the drying degree of graphite is shown in the following table 2; FIG. 2 is a graph showing the relationship between the degree of drying of the graphite coating and the effect of repeated printing
Table 2: drying degree of graphite coating when piston temperature is 35 ℃ and effect of repeated printing
From the above graph, it can be derived that the graphite screen printing is carried out at a piston temperature of 35 ℃:
(1) the effect of repeated printing is equivalent to that of single printing when the printing is immediately repeated after the first brushing is finished and the coating on the periphery is dried, and the thickness of the graphite coating cannot be increased due to repeated printing because the graphite is not dried;
(2) the printing is repeated when about half of the graphite coating is dried, the thickness of the graphite coating at the drying position is already improved, but the thickness of the graphite coating after the graphite is extruded is improved a little because of the part which is not dried;
(3) the printing was repeated with the entire graphite coating just dried, resulting in a graphite coating thickness that was approximately 2 times the thickness of the single printed graphite coating.
(4) And the graphite coating is completely dried until the whole stage is completely hardened, and the lifting effect of the repeated printing on the thickness of the graphite coating is consistent, which is equivalent to 2 times of the thickness of single printing.
(5) The graphite coating is repeatedly printed before hardening, and the graphite coating does not fall off; repeated printing begins after the edges of the graphite coating have hardened and advanced toward the middle, and the outer graphite of the repeated printing can partially fall off.
Specific example 2: graphite screen printing was performed at a piston constant temperature of 40 ℃, comprising the following steps:
s1, cleaning and drying;
s11, degreasing by using a degreasing agent: degreasing the surface to be machined of the aluminum piston by using a degreasing agent;
s12, pure water cleaning: after degreasing by the degreasing agent, cleaning the surface to be machined of the aluminum piston by using pure water;
s13, drying: after pure water cleaning, drying the aluminum piston at the drying temperature of 45-65 ℃;
s2, graphite printing;
s21, piston constant temperature: maintaining the aluminum piston at a constant temperature, wherein the constant temperature of the aluminum piston is 40 ℃;
s22, graphite printing: on the premise of keeping the piston at a constant temperature, performing graphite screen printing on the aluminum piston, wherein the environmental humidity is less than or equal to 50%;
s23, drying: naturally drying the coating on the aluminum piston;
s24, repeated printing: when all the coatings printed by the graphite in the step S22 are just dried, repeating the printing on the basis of the coatings;
s3, leveling and curing;
s31, leveling: the leveling time is 5-15 minutes;
s32, heating and curing: the temperature of heating and curing is 180-210 ℃, and 30-50 minutes are needed.
Drying time of the graphite coating:
by adopting the process, the graphite screen printing is carried out at the piston temperature of 40 ℃, and the drying speed of the graphite coating is as shown in the following table 3:
table 3: drying time of graphite coating when temperature of piston is 40 DEG C
| Piston temperature | 40℃ |
| Drying time of the coating on the periphery: min | 7.4 |
| Half of the coating drying time: min | 9.7 |
| Time to complete coating freshly dry: min | 11.2 |
| Drying hardening time of all coatings: min | 19.3 |
The drying degree of the graphite coating and the effect of repeated printing are realized by adopting the process, the graphite screen printing is carried out at the piston temperature of 40 ℃, and the relationship between the coating thickness and the adhesion effect of the repeated printing and the drying degree of the graphite is shown in the following table 4; the graph of the relationship between the degree of drying of the graphite coating and the effect of repeated printing is shown in fig. 3:
table 4: drying degree of graphite coating when temperature of piston is 40 ℃ and effect of repeated printing
From table 4 and fig. 3, it can be derived that graphite screen printing was performed at a piston temperature of 40 ℃:
(1) the effect of repeated printing is equivalent to that of single printing when the printing is immediately repeated after the first brushing is finished and the coating on the periphery is dried, and the thickness of the graphite coating cannot be increased due to repeated printing because the graphite is not dried;
(2) the printing is repeated when about half of the graphite coating is dried, the thickness of the graphite coating at the drying position is already improved, but the thickness of the graphite coating after the graphite is extruded is improved a little because of the part which is not dried;
(3) the printing was repeated with the entire graphite coating just dried, resulting in a graphite coating thickness that was approximately 2 times the thickness of the single printed graphite coating.
(4) And the graphite coating is completely dried until the whole stage is completely hardened, and the lifting effect of the repeated printing on the thickness of the graphite coating is consistent, which is equivalent to 2 times of the thickness of single printing.
(5) The graphite coating is repeatedly printed before hardening, and the graphite coating does not fall off; repeated printing begins after the edges of the graphite coating have hardened and advanced toward the middle, and the outer graphite of the repeated printing can partially fall off.
Specific example 3: graphite screen printing was performed at a piston constant temperature of 45 ℃, comprising the following steps:
s1, cleaning and drying;
s11, degreasing by using a degreasing agent: degreasing the surface to be machined of the aluminum piston by using a degreasing agent;
s12, pure water cleaning: after degreasing by the degreasing agent, cleaning the surface to be machined of the aluminum piston by using pure water;
s13, drying: after pure water cleaning, drying the aluminum piston at the drying temperature of 45-65 ℃;
s2, graphite printing;
s21, piston constant temperature: maintaining the aluminum piston at a constant temperature of 45 ℃;
s22, graphite printing: on the premise of keeping the piston at a constant temperature, performing graphite screen printing on the aluminum piston, wherein the environmental humidity is less than or equal to 50%;
s23, drying: naturally drying the coating on the aluminum piston;
s24, repeated printing: when all the coatings printed by the graphite in the step S22 are just dried, repeating the printing on the basis of the coatings;
s3, leveling and curing;
s31, leveling: the leveling time is 5-15 minutes;
s32, heating and curing: the temperature of heating and curing is 180-210 ℃, and 30-50 minutes are needed.
Drying time of the graphite coating:
by adopting the process, the graphite screen printing is carried out at the piston temperature of 45 ℃, and the drying speed of the graphite coating is as shown in the following table 5:
table 5: drying time of graphite coating when piston temperature is 45 DEG C
| Piston temperature | 45℃ |
| Drying time of the coating on the periphery: min | 4.8 |
| Half of the coating drying time: min | 6.6 |
| Time to complete coating freshly dry: min | 8.4 |
| Drying hardening time of all coatings: min | 14.7 |
By adopting the process, the graphite screen printing is carried out at the piston temperature of 40 ℃, and the relationship between the thickness of the coating and the adhesion effect of repeated printing and the drying degree of graphite is shown in the following table 6; the graph of the relationship between the drying degree of the graphite coating and the effect of repeated printing is shown in FIG. 4;
table 6: drying degree of graphite coating when piston temperature is 45 ℃ and effect of repeated printing
From table 6 and fig. 4, it can be derived that graphite screen printing was performed at a piston temperature of 40 ℃:
(1) the effect of repeated printing is equivalent to that of single printing when the printing is immediately repeated after the first brushing is finished and the coating on the periphery is dried, and the thickness of the graphite coating cannot be increased due to repeated printing because the graphite is not dried;
(2) the printing is repeated when about half of the graphite coating is dried, the thickness of the graphite coating at the drying position is already improved, but the thickness of the graphite coating after the graphite is extruded is improved a little because of the part which is not dried;
(3) the printing was repeated with the entire graphite coating just dried, resulting in a graphite coating thickness that was approximately 2 times the thickness of the single printed graphite coating.
(4) And the graphite coating is completely dried until the whole stage is completely hardened, and the lifting effect of the repeated printing on the thickness of the graphite coating is consistent, which is equivalent to 2 times of the thickness of single printing.
(5) The graphite coating is repeatedly printed before hardening, and the graphite coating does not fall off; repeated printing begins after the edges of the graphite coating have hardened and advanced toward the middle, and the outer graphite of the repeated printing can partially fall off.
By adopting the process, the graphite screen printing is carried out at the piston temperature of 35 ℃, 40 ℃ and 45 ℃, and the drying speed of the graphite coating is as shown in the following table 7:
table 7: drying time of graphite coating
| Piston temperature | 35℃ | 40℃ | 45℃ |
| Drying time of the coating on the periphery: min | 9 | 7.4 | 4.8 |
| Half of the coating drying time: min | 11.6 | 9.7 | 6.6 |
| Time to complete coating freshly dry: min | 15.2 | 11.2 | 8.4 |
| Drying hardening time of all coatings: min | 24 | 19.3 | 14.7 |
As can be seen from the data in table 7: the lower the temperature, the slower the graphite coating dries, affecting efficiency; the higher the temperature is, the shorter the drying time of the graphite coating is at 35-45 ℃; however, the temperature is too high, the graphite is dried quickly, the graphite leveling effect is influenced, the graphite coating is rough and uneven, and the appearance and the graphite coating adhesion are influenced.
By adopting the process, the graphite screen printing is carried out at the piston temperature of 35 ℃, 40 ℃ and 45 ℃, and the relation graph of the drying degree of the graphite coating and the effect of repeated printing is shown in figure 5;
as can be seen from fig. 5, the following results were obtained when the process was used to perform graphite screen printing at a piston temperature of 35 ℃, 40 ℃ and 45 ℃:
(1) the effect of repeated printing is equivalent to that of single printing when the printing is immediately repeated after the first brushing is finished and the coating on the periphery is dried, and the thickness of the graphite coating cannot be increased due to repeated printing because the graphite is not dried;
(2) the printing is repeated when about half of the graphite coating is dried, the thickness of the graphite coating at the drying position is already improved, but the thickness of the graphite coating after the graphite is extruded is improved a little because of the part which is not dried;
(3) the printing was repeated with the entire graphite coating just dried, resulting in a graphite coating thickness that was approximately 2 times the thickness of the single printed graphite coating.
(4) And the graphite coating is completely dried until the whole stage is completely hardened, and the lifting effect of the repeated printing on the thickness of the graphite coating is consistent, which is equivalent to 2 times of the thickness of single printing.
(5) The graphite coating is repeatedly printed before hardening, and the graphite coating does not fall off; repeated printing begins after the edges of the graphite coating have hardened and advanced toward the middle, and the outer graphite of the repeated printing can partially fall off.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Those skilled in the art can make numerous possible variations and modifications to the described embodiments, or modify equivalent embodiments, without departing from the scope of the invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technology of the present invention are within the protection scope of the present invention, unless the content of the technical solution of the present invention is departed from.
Claims (3)
1. A process for improving the thickness of a graphite screen printing coating of an aluminum piston is characterized by comprising the following steps: the method comprises the following steps:
s1, cleaning and drying;
s11, degreasing by using a degreasing agent: degreasing the surface to be machined of the aluminum piston by using a degreasing agent;
s12, pure water cleaning: after degreasing by the degreasing agent, cleaning the surface to be machined of the aluminum piston by using pure water;
s13, drying: after pure water cleaning, drying the aluminum piston at the drying temperature of 45-65 ℃;
s2, graphite printing, comprising the following substeps;
s21, piston constant temperature: keeping the aluminum piston at a constant temperature, wherein the constant temperature of the aluminum piston is 35-45 ℃;
s22, first printing: carrying out graphite screen printing on the aluminum piston under the condition that the piston is at constant temperature;
s23, drying: drying a coating generated after the aluminum piston is subjected to screen printing;
s24, second printing: when all coatings of the graphite screen printing in the step S22 are just dried or the edges of the coating are hardened, printing for the second time on the basis of the coatings;
s3, leveling and curing, wherein the leveling and curing method comprises the following substeps;
s31, leveling the coating, wherein the time for leveling the coating is 5-15 minutes
And S32, heating and curing, wherein the heating and curing temperature is 180-210 ℃, and the heating and curing time is 30-50 minutes.
2. The process for improving the thickness of the screen printing coating of the graphite of the aluminum piston as claimed in claim 1, wherein the process comprises the following steps: the environmental humidity of the graphite screen printing in the step S22 is less than or equal to 50 percent.
3. The process for improving the thickness of the screen printing coating of the graphite of the aluminum piston as claimed in claim 1, wherein the process comprises the following steps: the drying in step S23 is natural drying.
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| CN101658835A (en) * | 2008-08-29 | 2010-03-03 | 上海富臣化工有限公司 | Method for coating melamine plates with ultraviolet curing paint |
| CN102056409A (en) * | 2009-10-30 | 2011-05-11 | 湖南寰球电子科技有限公司 | Method and device for plugging hole by using piston during printed circuit board manufacture |
| CN103200777A (en) * | 2013-04-22 | 2013-07-10 | 景旺电子（深圳）有限公司 | Manufacture method of thick copper plate fine solder resist bridge |
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|---|---|---|---|---|
| CN102705100A (en) * | 2012-06-12 | 2012-10-03 | 曲阜金皇活塞股份有限公司 | Internal combustion engine piston provided with composite layer and manufacturing method thereof |
| CN102738301A (en) * | 2012-06-15 | 2012-10-17 | 上海中智光纤通讯有限公司 | Method for forming crystalline silicon solar cell front electrode |
| CN106029382A (en) * | 2013-05-23 | 2016-10-12 | 埃克森蒂斯知识股份公司 | Machine for producing three-dimensional screen-printed articles |
| CN105313513A (en) * | 2015-10-27 | 2016-02-10 | 山东双港活塞股份有限公司 | Printing method and curing oven for piston skirt carbon fiber coating |
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