JP5400525B2 - Surface treatment apparatus for cylinder barrel inner surface and surface treatment method thereof - Google Patents

Description

  The present invention relates to a surface treatment technique for an inner surface of a cylinder barrel in which a treatment liquid is brought into contact with an inner surface of a cylinder barrel provided in a cylinder block to treat the inner surface.

Since the inner surface of the cylinder barrel of the engine is exposed to high heat due to friction caused by piston rings and combustion of fuel, surface strength is required. Surface treatment is effective for increasing the strength of the surface. When performing a plating process which is one of the surface treatments, it is desired to remove surface stains and the like before the plating process. Such a process of removing dirt and the like before the surface treatment is called pretreatment.
An example of the pretreatment of the plating process will be described with reference to the following diagram.

  As shown in FIG. 8, in the pretreatment, an etching treatment, an acid activation treatment, a first zinc substitution treatment, a dissolution activation treatment, and a second zinc substitution treatment are performed. The etching process alone is composed of a plurality of processes such as chemical treatment with a treatment liquid, primary water washing for washing, secondary water washing and an idler for preventing drying. Among these processes, a specific example of a chemical treatment process has been proposed (see, for example, Patent Document 1 (FIG. 3B)).

The technique of this patent document 1 is demonstrated below based on drawing.
As shown in FIG. 9, the cylinder block 101 is placed on the pallet 104 provided with the lower opening closing member 103 to close the lower opening of the cylinder block 101. Then, the pallet 104 is placed on the pan 105, and the lid 107 provided with the nozzle 106 is moved as indicated by the arrow (1) to close the upper opening of the cylinder block 101.

The processing liquid is supplied from the processing liquid supply path 108 to the nozzle 106 as indicated by the arrow (2).
The supplied processing liquid is injected from the processing liquid injection hole 109 to the lower part of the cylinder barrel 110 as indicated by an arrow (3), and ascends while contacting the inner surface of the cylinder barrel 110 as indicated by an arrow (4).
The processing liquid in the cylinder barrel 110 is discharged mainly from the first drainage passage 111 provided in the pallet 104 as indicated by an arrow (5), and the remaining portion of the processing liquid is covered by a lid as indicated by an arrow (6). The liquid is discharged from the second drainage passage 112 provided in the body 107.

  By the way, there are various forms of cylinder blocks. Therefore, the inventors performed the same etching process on a cylinder block having no crankcase portion 102.

  As shown in FIG. 10, the cylinder block 114 is placed on the pallet 115 with the gasket surface 113 facing upward. The step portion 117 is sealed by the seal member 116. Further, the upper opening 119 of the cylinder barrel 118 is covered with a cover member 121 having a recess 120 connected to the upper opening 119 of the cylinder barrel 118. The cover member 121 is provided with a nozzle 122 for supplying a processing liquid to the inner surface of the cylinder barrel 118, and a processing liquid injection hole 123 for injecting the processing liquid is provided below the nozzle 122.

When the processing liquid was supplied to the cylinder block 114 in the same manner as in FIG. 9, the following results were obtained. Note that reference symbols A, B, and C in FIG. 10 indicate measurement points at the upper, middle, and lower portions of the inner surface of the cylinder barrel 118.
When the high-temperature processing liquid is injected from the processing liquid injection holes 123 and 123, the processing liquid accumulates in the pallet 115, rises in the cylinder barrel 118, and reaches the recess 120. As a result, the temperature rises at point C first, point B continues, and point A heats up last. In addition, since the retained heat is absorbed by the cylinder barrel 118 until the processing liquid reaches the point A, the temperature of the processing liquid decreases.
As a result, as shown in FIG. 11, a temperature difference of maximum T1 = 25 ° C. occurs between the temperature rising curve at point A and the temperature rising curve at point C.

  The cylinder barrel surface is etched (corroded) by the treatment liquid, and the magnitude of the etching treatment varies depending on the temperature. A temperature difference as high as T1 = 25 ° C. is expected to affect the etching process. Therefore, the etching amount for each of the points A, B, and C was examined.

  As shown in FIG. 12A, the etching amount x1 was sufficient at the points B and C, but the etching amount x1 was small at the point A.

  When the etching amount is small, that is, when the etching amount is insufficient, it is expected that the adhesion of the plating is lowered. Therefore, the adhesion of plating was examined for each of points A, B, and C.

  As shown in FIG. 12B, when the cylinder barrel subjected to this pretreatment is plated, it has been found that the peeling width y1 of the plating is small at the points B and C and large at the point A. This is due to non-uniform processing due to the temperature difference on the inner surface of the cylinder barrel. That is, there is a need for a surface treatment technique for the inner surface of a cylinder barrel that can make the surface treatment uniform.

JP 2008-214730 A

  An object of the present invention is to provide a surface treatment technique for the inner surface of a cylinder barrel that can make the surface treatment uniform.

An invention according to claim 1 is a surface treatment device for an inner surface of a cylinder barrel, wherein the inner surface of the cylinder barrel provided in the cylinder block of the internal combustion engine is brought into contact with a treatment liquid to treat the inner surface. A pallet that supports the cylinder block and closes the lower opening of the cylinder barrel with the gasket surface facing upward, and a first part that is provided on the pallet and discharges a part of the processing liquid stored in the cylinder barrel. a drainage passage, have a recess leading to the upper opening of the cylinder barrel with recessed upward, and a cover member for covering an upper opening of the cylinder barrel mounted on the gasket face, it extends down from the cover member is, includes a processing fluid spray nozzles for jetting towards said processing liquid on the wall of the recess, the cylinder barrel through a wall of said recess A nozzle for supplying a treatment fluid to the inner surface, and wherein the second drain passage, in that it consists of discharging a remaining portion of said processing liquid pooled in the cylinder barrel provided in the cover member.

  The invention according to claim 2 is a surface treatment method for an inner surface of a cylinder barrel, wherein a treatment liquid is brought into contact with an inner surface of a cylinder barrel provided in a cylinder block of an internal combustion engine to treat the inner surface. Placing the cylinder block on a pallet that closes the lower opening of the cylinder barrel with the gasket surface facing upward, and inserting the nozzle for supplying the processing liquid into the upper opening of the cylinder barrel, A cover member having a concave portion connected to the upper opening of the barrel at the lower portion, covering the upper opening of the cylinder barrel, and injecting the processing liquid from the processing liquid injection hole provided in the nozzle toward the wall of the concave portion. Supplying the treatment liquid to the inner surface of the cylinder barrel through the wall of the recess, and collecting the treatment liquid in the cylinder barrel. A part of the processing liquid is discharged from a first drainage passage provided in the pallet, and a remaining part of the processing liquid stored in the cylinder barrel is provided in a second member provided in the cover member. And a step of discharging from the drainage passage.

  The invention according to claim 1 has a concave portion connected to the upper opening of the cylinder barrel at the lower portion, a cover member that is placed on the gasket surface and covers the upper opening of the cylinder barrel, and is attached to the cover member. A nozzle for supplying a processing liquid to the inner surface of the cylinder barrel through the wall of the recess; Since the processing liquid is not sprayed directly onto the inner surface of the cylinder barrel, but the processing liquid is sprayed into the concave portion, it is possible to prevent a preferential reaction to the portion directly hit with the processing liquid and make the reaction uniform. As a result, since the etching process on the inner surface of the cylinder barrel becomes uniform, the adhesion of the plating can be improved.

  In the invention according to claim 2, the step of injecting the processing liquid from the processing liquid injection hole provided in the nozzle toward the wall of the recess and supplying the processing liquid to the inner surface of the cylinder barrel through the wall of the recess; A part of the processing liquid stored in the cylinder barrel is discharged from the first drain passage provided in the pallet, and the remaining part of the processing liquid stored in the cylinder barrel is provided in the cover member. And a step of discharging from the two drainage passages. By introducing the treatment liquid from above the thick cylinder barrel and increasing the liquid level from below again to circulate the treatment liquid, the temperature difference between the upper and lower parts of the cylinder barrel inner surface can be reduced. Processing can be made uniform. As a result, since the etching process on the inner surface of the cylinder barrel becomes uniform, the adhesion of the plating can be improved.

It is a side view of the surface treatment apparatus of the cylinder barrel inner surface which concerns on this invention. It is sectional drawing of the principal part of this invention. It is explanatory drawing of the process of setting a cylinder block. It is explanatory drawing of the process of surface-treating to a cylinder block. It is a figure which shows the temperature change of the cylinder barrel inner surface in this invention. It is a comparison figure of the temperature difference in this invention and a prior art. It is a figure which shows the etching amount in this invention, and the adhesiveness of plating. It is a figure explaining the pretreatment process of plating. It is a figure explaining the basic principle of the prior art. It is a figure explaining the example which used the prior art for the cylinder block without a crankcase part. It is a figure which shows the temperature change of the cylinder barrel inner surface in a prior art. It is a figure which shows the etching amount and the adhesiveness of plating in a prior art.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

Embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the surface treatment apparatus 10 on the inner surface of the cylinder barrel is provided on a base 12 having an adjuster 11, a lower column 13 rising from the base 12, and an upper end of the lower column 13. An intermediate support member 15, a pan 16 that is supported by the intermediate support member 15 and collects the processing liquid, a processing liquid discharge pipe 14 that discharges the processing liquid collected in the pan 16, and a pan 16 are provided. The surrounding member 17, the surface treatment unit 20 provided in the middle support member 15 so as to be surrounded by the enclosure member 17, and the drainage from the upper part of the surface treatment unit 20 provided in the surface treatment unit 20 A drainage pipe 21, a treatment liquid detection unit 22 that monitors the drainage of the drainage pipe 21, a middle column 23 raised from the middle support member 15, and an upper end of the middle column 23. On Comprises a support member 24, the upper column 25 has been raised from the upper support member 24, a top plate 26 provided at the upper end of the upper column 25.

  The surface treatment unit 20, which will be described in detail later, includes a pallet 31 that supports the cylinder block 27 on which the surface treatment is performed, a cover member 32 that covers the top of the cylinder block 27, and one of the treatment liquids provided on the cover member 32. And a second drainage passage 33 for discharging the part.

  Further, the surface treatment 10 on the inner surface of the cylinder barrel is swingable about a rotary shaft 36 at the lower end of the lifting rod 34 and the lifting cylinder 35 provided on the top plate 26 for lifting the cover member 32 via the lifting rod 34. And an oscillating cylinder 41 which is provided below the elevating rod 34 and oscillates the oscillating portion 37 via an advancing / retreating rod 38.

Next, the main part of the surface treatment apparatus 10 on the cylinder barrel inner surface will be described.
As shown in FIG. 2, the surface treatment unit 20 as a main part of the surface treatment device 10 on the cylinder barrel inner surface supports the cylinder block 27 so that the gasket surface 42 of the cylinder block 27 faces upward and supports the cylinder barrel. A pallet 31 that closes the lower opening 44 of the cylinder 43, a first drainage passage 45 that is provided on the pallet 31 and discharges a part of the processing liquid stored in the cylinder barrel 43, and a cylinder block 27 that is provided on the pallet 31. A step seal member 47 for sealing the step portion 46 of the cylinder block 27, a positioning pin 51 for positioning the hole 48 of the cylinder block 27 provided on the pallet 31, and a recess 53 connected to the upper opening 52 of the cylinder barrel 43. A cover member 32 placed on the surface 42 and covering the upper opening 52 of the cylinder barrel 43, and the cover member 3 A gasket surface sealing member 54 that seals the gasket surface 42 and is attached to the cover member 32 so as to be inserted downward into the cover member 32, and the processing liquid is directed toward the wall 55 of the recess 53. A nozzle 57 for supplying the processing liquid to the inner surface of the cylinder barrel 43 through the wall 55 of the recess 53, a processing liquid supply path 58 for supplying the processing liquid to the nozzle 57, The second drainage passage 33 is provided in the cover member 32 and discharges the remaining portion of the processing liquid stored in the cylinder barrel 43.

The operation of the surface treatment apparatus 10 on the inner surface of the cylinder barrel described above will be described with reference to FIGS. First, FIG. 3 shows steps until the cylinder block 27 is set in the surface treatment apparatus 10.
FIG. 3A shows a process of placing the cylinder block 27. The cylinder block 27 is placed on the pallet 31 that closes the lower opening 44 of the cylinder barrel 47 so that the gasket surface 42 of the cylinder block 27 faces upward as indicated by an arrow (7). The cylinder block 27 is positioned by inserting the positioning pin 51 into the hole 48.

  FIG. 3B shows a process of covering the upper opening 52. The cover member 32 is moved as indicated by an arrow (8), and the nozzle 57 is inserted into the upper opening 52 of the cylinder barrel 43, and the upper opening 52 of the cylinder barrel 43 is covered.

  FIG. 4A shows a process of supplying the treatment liquid. The processing liquid is supplied as indicated by an arrow (9), and sprayed from the processing liquid spray hole 56 toward the wall 55 of the recess 53. The processing liquid is supplied to the inner surface of the cylinder barrel 43 through the wall 55 of the recess 53 as indicated by an arrow (10).

  FIG. 4B shows a step of discharging the processing liquid from the first drainage passage. A part of the processing liquid stored in the cylinder barrel 43 is discharged from the first drainage passage 45 as indicated by an arrow (11). The supply amount of the processing liquid is larger than the amount discharged from the first drainage passage 45. Therefore, the processing liquid ascends in the cylinder barrel 43 as indicated by an arrow (12). Since the volume of the space formed by the inner surface of the cylinder barrel 43 and the outer surface of the nozzle 57 is reduced by the nozzle 57 extending to the lower side of the cylinder barrel 43, the processing liquid rises faster and the number of processes is shortened. be able to.

  FIG. 4C shows a step of discharging the processing liquid from the second drainage passage. The remainder of the processing liquid stored in the cylinder barrel 43 is discharged from the second drainage passage 33 as shown by an arrow (13). In addition, surface treatment can be reliably implemented by monitoring a drainage liquid by a process liquid detection part (FIG. 1, code | symbol 22).

Next, the inventors examined temperature changes at points A, B, and C shown in FIG. The result will be described with reference to the next figure.
As shown in FIG. 5, at the points B and C at the lower part and the middle part of the cylinder barrel 43, the temperature immediately increased when the high-temperature treatment liquid was supplied. Also at the point A at the upper part, a result that the temperature rise was faster than the conventional example of FIG. 11 was obtained. This is because the high-temperature processing liquid was supplied from above the inner surface of the cylinder barrel 43, and first, the retained heat of the processing liquid was transferred to point A and the temperature was first raised. T2 represents the maximum temperature difference.

Next, the temperature difference in the example of FIG. 2 was compared with the temperature difference in the conventional example of FIG. The result will be described with reference to the next figure.
As shown in FIG. 6, the maximum temperature difference T1 = 25 ° C. in the conventional example, whereas the maximum temperature difference T2 = 12 ° C. in the example. Immediately after the start of the supply of the treatment liquid, the embodiment has a small temperature difference of 15 ° C. or less due to the difference in position of the cylinder barrel inner surface. It can be seen that the temperature of the inner surface of the cylinder barrel is more uniform in the example than in the conventional example.

  Reducing the temperature difference to 15 ° C. or less is expected to reduce the influence on the etching process. Therefore, the etching amount for each of the points A, B, and C was examined. The result will be described with reference to the next figure.

As shown in FIG. 7A, the etching amount x2 is 2.5 μm or more at points A, B, and C, and the etching amount is sufficient.
If the etching amount is sufficient, it is expected that the adhesion of plating is improved. Therefore, the adhesion of plating was examined for each of points A, B, and C. The result will be described with reference to the next figure.

  As shown in FIG. 7B, when the cylinder barrel subjected to this pretreatment is plated, the peeling width y2 of the plating is small at all points A, B, and C. This indicates that the processing is made uniform because of the small temperature difference on the inner surface of the cylinder barrel.

  The surface treatment technology for the cylinder barrel according to the present invention is applied to the pretreatment for plating in the embodiment, but is not limited to the pretreatment for plating. It can be applied to processing steps.

  The surface treatment technology for the cylinder barrel inner surface of the present invention is suitable for pretreatment of plating on the cylinder barrel inner surface.

  DESCRIPTION OF SYMBOLS 10 ... Surface treatment apparatus of cylinder barrel inner surface, 20 ... Surface treatment part, 27 ... Cylinder block, 31 ... Pallet, 32 ... Cover member, 33 ... 2nd drainage passage, 42 ... Gasket surface, 43 ... Cylinder barrel, 44 ... lower opening, 45 ... first drainage passage, 52 ... upper opening, 53 ... recess, 55 ... wall, 56 ... treatment liquid injection hole, 57 ... nozzle.

Claims (2)

A surface treatment device for an inner surface of a cylinder barrel for treating the inner surface by bringing a treatment liquid into contact with an inner surface of a cylinder barrel provided in a cylinder block of an internal combustion engine,
A pallet that supports the cylinder block and closes the lower opening of the cylinder barrel, with the gasket surface of the cylinder block facing up,
A first drainage passage for discharging a part of the processing liquid provided in the pallet and stored in the cylinder barrel;
A cover member have a recess leading to the upper opening of the cylinder barrel with recessed upward, is placed on the gasket surface to cover the upper opening of the cylinder barrel,
A treatment liquid injection hole that extends downward from the cover member and injects the treatment liquid toward the wall of the recess, and supplies the treatment liquid to the inner surface of the cylinder barrel through the wall of the recess. A nozzle,
A second drainage passage that is provided in the cover member and discharges the remaining portion of the processing liquid stored in the cylinder barrel;
A surface treatment apparatus for an inner surface of a cylinder barrel, comprising: A surface treatment method for an inner surface of a cylinder barrel, wherein a treatment liquid is brought into contact with an inner surface of a cylinder barrel provided in a cylinder block of an internal combustion engine to treat the inner surface,
Placing the cylinder block on a pallet that closes the lower opening of the cylinder barrel so that the gasket surface of the cylinder block is on top;
A step of covering the upper opening of the cylinder barrel with a cover member having a recess connected to the upper opening of the cylinder barrel at the lower part while inserting a nozzle for supplying the processing liquid to the upper opening of the cylinder barrel;
Injecting the processing liquid from the processing liquid injection hole provided in the nozzle toward the wall of the recess, and supplying the processing liquid to the inner surface of the cylinder barrel through the wall of the recess;
A part of the processing liquid stored in the cylinder barrel is discharged from a first drain passage provided in the pallet, and a remaining part of the processing liquid stored in the cylinder barrel is discharged to the cover. Discharging from a second drainage passage provided in the member;
A surface treatment method for an inner surface of a cylinder barrel, comprising:

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