JP3375549B2 - Composite plating method for cylindrical members - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
The present invention relates to a composite plating method for forming a composite plating film. [0002] 2. Description of the Related Art A cylinder block for an internal combustion engine includes a cylinder block.
The cylinder is cast and formed integrally with the cylinder block,
Some have a Ni / SiC composite plating film on the inner surface
You. The Ni / SiC composite plating film is a metal phase (Ni
Rix) with eutectoid ceramic particles (SiC particles)
Thus, the wear resistance is improved. This Ni / SiC
An example of the composite plating method will be described below. FIG. 6 shows a conventional typical Ni / SiC composite method.
It is sectional drawing which shows a hook method. Cylinder block 100
Between the cylinder 101 and the cylindrical electrode 102
103, and Ni / SiC composite plating
While flowing the liquid 104 as indicated by arrows a and a, the cylindrical electrode 102
And the cylinder block 100 are energized. Departs when energized
With the generated current density, Ni matrix
Deposits 106 in the Ni matrix 106
Shows a plurality (pieces) of SiC particles 107.
Mr. ). Hereinafter, the eutectoid of SiC particles 107.
The relationship with the current density will be described. FIG. 7 shows current in a conventional composite plating method.
It is a graph which shows the relationship between density and eutectoid of SiC particle,
The vertical axis represents the current density (A / dm^Two) And the horizontal axis is the plating process.
Indicates the processing time (minutes). Complete plating from the beginning of plating
Until the end (time T3), the current density was increased to A3 (A /
dm^TwoThe plating process is performed while maintaining the above conditions. Return to FIG.
From the beginning of the plating process, Ni / SiC composite plating solution
The SiC particles 107 in 104 move as shown by arrows b.
Eutectoid in the Ni matrix 106. [0005] SUMMARY OF THE INVENTION S from the beginning of the plating process
The iC particles 107 eutect into the Ni matrix 106
Then, the SiC particles 107 contact the cylinder inner surface 101a.
May touch. For this reason, the SiC particles 107
It becomes a magic, and the Ni matrix 106 can be deposited.
The Ni matrix 106 is not
Floats from the inner surface 101a. As a result,
It is possible to ensure sufficient adhesion of the plating film 105.
It may not be possible. Accordingly, an object of the present invention is to provide a composite plating film
To provide technology that can enhance the adhesion of
You. [0007] [MEANS FOR SOLVING THE PROBLEMS]
In the first aspect of the present invention, a plurality of injections are provided in the hollow portion of the cylindrical member.
Arrange a cylindrical electrode with injection holes, and form a cylindrical from multiple injection holes
Toward the inner surface of the member, a composite
While spraying a certain amount of liquid, the cylindrical electrode and cylindrical member
And reduce the current density generated by this
Set and deposit only the metal phase on the inner surface of the cylindrical member,
After the time has elapsed, set the current density to a high value to
EutectA composite plating method for a cylindrical member, comprising:
When spraying a certain amount of plating solution, the cylindrical electrode is rotated at a constant speed.
Rotate in degreesIt is characterized by the following. The current density is initially set low, so that the
By depositing only the metal phase on the surface, the entire inner surface of the cylindrical member
A metal phase can be deposited in the area. For this reason, metal
Since there is no part floating from the inner surface of the cylindrical member, the metal phase
Can be firmly attached to the inner surface of the tubular member. Ma
After the lapse of a predetermined time, set the current density to a high
Co-deposited particles into the normal composite plating film
In the same manner as described above, the wear resistance can be improved. [0009]further,Rotate the cylindrical electrode at a constant speed
thingByEvenly apply the composite plating solution to the inner surface of the cylindrical member.
Metal phase on the inner surface of the tubular member
Can be precipitated. As a result, the adhesion of the metal phase
Can be increased sufficiently. [0010] DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the accompanying drawings.
This will be described below. FIG. 1 shows a cylindrical member according to the present invention.
It is an overall view showing a composite plating apparatus. Composite member of cylindrical member
The stick device 1 places a tubular member (cylinder block) 2 thereon.
Mounting table 4 and the hollow part of cylinder block 2
(D) a cylindrical electrode 10 disposed in 2a and a cylindrical electrode 1
0, and the inner hole 1 of the cylindrical electrode 10.
1 circulating means 30 for supplying a composite plating solution 26
Through which the cylinder block 2 and the cylindrical electrode 10 are energized.
And electric means 40. 2b is the inner surface of cylinder 2a
Inner surface of the cylinder). 36 is a return flow path,
36 is formed by a gap between the cylinder 2a and the cylindrical electrode 10.
It was done. 41 is a rotary connector for energization.
You. The mounting table 4 is used for mounting the cylindrical electrode 10 thereon.
Open the hole 5 in the center and open the supply hole 6 below the side of the mounting hole 5.
And a discharge hole 7 is formed on the upper side of the mounting hole 5.
You. The cylindrical electrode 10 has the bearing 1 in the mounting hole 5 of the mounting table 4.
A cylindrical member rotatably mounted via
To form an introduction hole 15 in the cylindrical peripheral wall 14 on the mounting table 4 side.
Then, a plurality of injections are performed on the peripheral wall 14 facing the cylinder inner surface 2b.
The holes 16 are formed. The rotating means 20 includes a motor 21 and a motor shaft.
Drive gear 23 attached to 22 and meshes with drive gear 23
Gear 24 fitted to the lower part 17 of the cylindrical electrode 10
Consists of The plating solution circulating means 30 includes the composite plating solution 2
6 and a composite plating of this tank 31
A supply path 32 for guiding the liquid 26 to the supply hole 6,
The pump 33 provided inside and the composite
The recovery path 34 returns the liquid 26 to the tank 31. A composite of the above-described tubular member according to the present invention.
Next, the plating method will be described. First, cylinder block 2
Is mounted on the mounting table 4 and then the motor 21 is driven to
Transfer the rolling force to the motor shaft 22 → drive gear 23 → gear 24
The cylindrical electrode 10 is rotated as shown by the arrow. Next, pump 3
3 to drive the composite plating solution 26 in the tank 31 with an arrow.
, The supply electrode 32 → the cylindrical electrode 1 through the introduction hole 6.
0 is supplied to the inner hole 11. The composite plating solution 26 in the inner hole 11 is
… Through the outside of the cylindrical electrode 10 as shown by the arrow
To the cylinder inner surface 2b. Thereafter, the return flow path 36 is duplicated.
As shown by the arrow, the plating solution 26 is → the discharge hole 7 → the recovery path.
Return to the tank 31 through. Circulate composite plating solution 26
By operating the energizing means 40 in the ringed state, the cylindrical electrode 10
By energizing the cylinder block 2, the current density
And apply a composite plating film to the cylinder inner surface 2b.
You. Below, the current density of the composite plating method and ceramics
The relationship with particles will be described. FIG. 2 shows current density and ceramic according to the present invention.
4 is a graph showing the relationship between the particle and the eutectoid.
Density (A / dm^Two) And the horizontal axis is the plating time
(Minutes). Initial operation from the start of composite plating to time T1
, The current density is set to A1 (A / dm^Two) And lower
You. Next, the steady operation from time T1 to plating completion T2 is performed.
Flow density A2 (A / dm^Two) And set it high. FIGS. 3A and 3B show current densities according to the present invention.
FIG. 3 is a diagram illustrating the relationship between the degree and the eutectoid of ceramic particles.
(A) shows the initial operation and (b) shows the steady operation.
You. In (a), a composite plating solution flowing as indicated by an arrow
26 has a relatively low current density A1 (A / dm^Two) Occurs
You. Metal ions in the composite plating solution 26 have a relatively low current
Even at the density A1, the metal phase (metal matrix)
G) as 27. On the other hand, in the composite plating solution 26
(Ceramic particles) 28 of the cylinder inner surface 2
It flows like an arrow without moving toward b. In (b), the composite flowing as indicated by the arrow
A relatively high current density A2 (A / dm^Two)
Occurs. Ceramic particles 2 in composite plating solution 26
8 moves as indicated by an arrow and the metal matrix 27 moves.
Ceramic particles 28 are eutectoid therein. The current density at the beginning of the plating process is A1 (A / d
m^Two) And set a low metal mat on the cylinder inner surface 2b.
By depositing only the gas 27, the entire cylinder inner surface 2b
A metal matrix 27 can be applied to the area.
For this reason, the metal matrix 27 is applied to the cylinder inner surface 2b.
Can be firmly attached. After a lapse of a predetermined time,
The current density is A2 (A / dm^Two) And set the metal mat high
The ceramic particles 28 are eutectoid in the liquor 27.
As a result, abrasion resistance can be
Can be enhanced. Further, by rotating the cylindrical electrode 10 of FIG.
Apply the composite plating solution 26 evenly to the cylinder inner surface 2b.
So that a metal matrix can be applied to the cylinder inner surface 2b.
27 is deposited uniformly and adhesion of metal matrix 27
Can be increased sufficiently. [Experimental Example] A tubular member according to the present invention will be described below.
4 (a) and 4 (b) show an experimental example of the composite plating method of FIG.
5, will be described with reference to Tables 1 to 3. However, the present invention
It is not limited to these experimental examples. [0021] [Table 1] First Experimental Example: The composite plating solution 26 was
Kernel (NiSO_Four) 45-70 g / l (liter),
Sodium sulfate (Na_TwoSO_Four) 250 g / l, boric acid 4
0 g / l, pH = 2.5 with addition of phosphorous acid 40 g / l
In addition, silicon nitride (Si_ThreeN_Four) 45 g / l particles suspended
It was made. The cylindrical electrode 10 (shown in FIG. 1)
101 injection holes 16 having a hole diameter of 2.0 mm are formed in the wall 14.
The inner diameter of the cylindrical electrode 10 is 17.0 mm. The rotational speed of the cylindrical electrode 10 is set to an initial operation and a steady state.
In operation, set to 5 rpm and constant speed, composite plating
The injection amount of the liquid 26 is set to 3
It was set to a fixed amount of 0 l / min. Also, the current density
A1 = 5A / dm during operation (4 minutes 30 seconds)^TwoSet to steady
A2 = 10A / dm during operation (73 minutes 20 seconds)^TwoSet to
Was. The preferred range of the current density A1 is 4 (A / dm
^Two) ≦ A1 ≦ 6 (A / dm^Two). Here, the current density A1 is set to 4 (A / dm^Two)
≦ A1 ≦ 6 (A / dm^Two) Because the current density
A1 is 4 (A / dm^Two) Smaller and metal matrix 2
7. It takes too much time to precipitate 7 and the initial operation time is long
A1 is 6 (A / dm^TwoLarger than during initial operation
This is because the ceramic particles 28 are eutectoid.
Further, the current density A2 is set to 10 (A / dm^Two)
The reason is that in the time of steady operation (73 minutes 20 seconds), ceramics
This is because the particles 28 can be preferably eutectoid. FIGS. 4A and 4B show a cylindrical portion according to the present invention.
FIG. 4 is a comparison diagram of a new and an old method of composite plating of a material, wherein FIG.
An experimental example and (b) show a comparative example. The vertical axis is the current density
(A / dm^Two) And the horizontal axis represents the plating time (min).
Show. (A) In the initial operation (4 minutes 30 seconds)
Density A1 is 5 A / dm^TwoAnd set a low, complex plating solution
Precipitates metal ions (Ni ions and P ions) in
As a result, a metal matrix (Ni
-9P matrix) 27 only. Next, stationary
During the operation (4 minutes 30 seconds to 77 minutes 50 seconds), the current density A2 was set to 1
0A / dm^TwoAnd high setting, Ni-9P matrix
Ceramic particles (Si_ThreeN _FourParticles) 28 ...
Analyze. (B), from the beginning of the composite plating process,
Flow density of 10 A / dm^TwoAnd set high, Ni-9P
Si in trix 27_ThreeN_FourThe particles 28 are eutectoid. Less than
Below, the evaluation test method of adhesion of composite plating film is explained.
I do. FIGS. 5A and 5B show the density of the composite plating film.
It is explanatory drawing of the adhesion evaluation test method. (A)
Push the pin 50 into the hole 51 formed in the
Insert like this. As an example, the diameter D1 of the hole 51 is 6.5.
mm, the outer diameter D2 of the extrusion pin 50 is 6.0 mm, and the thin portion
52 has a thickness T of 1.0 to 1.5 mm. In (b), a load F is applied to the pushing pin 50.
To break the thin portion 52 of the cylinder block 2
In both cases, the composite plating film (metal matrix)
27 and ceramic particles 28...)
Determine the adhesion of the composite plating film. This composite plating skin
The test method for evaluating the adhesion of the film was carried out according to the first experimental example shown in FIG.
Each of the comparative examples shown in FIG. 4B was performed 10 times. So
Table 2 shows the results. [0028] [Table 2] The average peel width Ave.x of the first experimental example is: Ave.x = (0.0 + 0.1 + 0.0 + 0.05 + 0.0 + 0.1 + 0.0 + 0.0
+ 0.05 + 0.0) /10=0.03mm And the adhesion of the composite plating film is good.
"Good". The average peel width Ave.x of the comparative example is: Ave.x = (0.1 + 0.5 + 0.1 + 0.8 + 0.2 + 0.0 + 0.3 + 0.5 +
0.2 + 0.5) /10=0.32mm The adhesion of the composite plating film is not favorable,
The value is "bad". [0031] [Table 3] Second Experimental Example: The composite plating solution 26 was
Kernel (NiSO_Four) 400 g / l, boric acid 35 g /
l, pH with addition of 2.5 g / l of saccharin sodium =
2.5 g of silicon carbide (SiC) particles
It is turbid. The cylindrical electrode 10 (shown in FIG. 1)
In the same manner as in the first experimental example, the peripheral wall 14 is sprayed with a hole diameter of 2.0 mm.
It has 101 holes 16 and has an inner diameter of the cylindrical electrode 10.
Is 17.0 mm. The rotational speed of the cylindrical electrode 10 is set to an initial operation and a steady state.
In operation, set to 5 rpm and constant speed, composite plating
The injection amount of the liquid 26 is set at the flow rate 3 in the initial operation and the steady operation.
It was set to a fixed amount of 0 l / min. The second experimental example is the first experimental
The current densities A1 and A2 are set higher than
The initial operation time and the steady operation time are shortened.
You. That is, the current density is A1 in the initial operation (70 seconds).
= 14A / dm^Two, And A in normal operation (235 seconds)
2 = 64 A / dm^TwoSet to. The current density A1
A preferred range is 10 (A / dm^Two) ≦ A1 ≦ 18 (A /
dm^Two). Here, 10 (A / dm^Two) ≦ A1 ≦ 18
(A / dm^Two) Is because the current density A1 is 10
(A / dm^Two) Smaller and precipitation of metal matrix 27
Takes too much time and the initial operation time becomes longer.
18 (A / dm^Two) Larger than during the initial operation
This is because the particles 28 are eutectoid. In addition,
The flow density A2 is 64 (A / dm^Two)
Ceramic particles 28 ... in normal operation (235 seconds)
This is because eutectoids can be suitably used. In the initial operation (70 seconds), the current density A1 was increased to 14
A / dm^TwoTo lower the metal ion in the composite plating solution.
The inner surface of the cylinder by depositing
Deposit only metal matrix (Ni matrix) on 2b
Put out. Next, the current density A2 in the steady operation (235 seconds)
64A / dm^TwoAnd set it high
The ceramic particles (SiC particles) 28 are eutectoid. The second experimental example is similar to the first experimental example.
A test was conducted to evaluate the adhesion of the composite plating film. Second experiment
In the example, the components of the composite plating solution are different from those in the first experimental example.
However, by setting the current density in the initial operation low,
The average peel width Ave.x should be approximately the same as the value in the first experimental example
There was found. As a result, the adhesion of the composite plating film
And got a rating of “good”. In the first experimental example, in the initial operation,
When the current density A1 is 4 (A / dm^Two) ≦ A1 ≦ 6 (A / d
m^Two), And the current density A2 during the steady operation is set to 10 (A
/ Dm^Two), And in the second experimental example, the initial operation
Current density A1 at 10 (A / dm^Two) ≦ A1 ≦ 18
(A / dm^Two), And set the current density A2 during steady operation to
64 (A / dm^Two), But the current density A1
The flow density A2 is not limited to this value. In addition, the cylindrical member
Although it has been described as the dust block 2, other cylindrical members may be used.
It is also possible to apply. [0038] According to the present invention, the following effects are exhibited by the above configuration.
I do. A first aspect of the present invention is to set the current density to a low value at the beginning, and
By depositing only the metal phase on the inner surface of the material,
A metal phase can be deposited on the entire inner surface. others
Because there is no part floating from the inner surface of the cylindrical member
Thus, the metal phase can be firmly adhered to the inner surface of the tubular member.
Wear. As a result, the adhesion of the composite plating film is improved.
Can be. Also, after a predetermined time has elapsed, set the current density to a high value
By eutectoid particles in the metal phase
Abrasion resistance can be enhanced as in the case of the combined plating film. [0039]further,Apply a composite plating solution to the inner surface of the cylindrical member.
Since it can be applied evenly, metal
The phase can be deposited uniformly. As a result, the metal phase
Can be sufficiently enhanced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a composite plating apparatus for a cylindrical member according to the present invention. FIG. 2 is a graph showing the relationship between current density and eutectoid of ceramic particles according to the present invention. FIG. 4 is a graph showing the relationship between current density and eutectoid deposition of ceramic particles according to the present invention. FIG. 4 is a comparison diagram of a new and an old method of composite plating of a cylindrical member according to the present invention. FIG. 6 is a cross-sectional view showing a typical conventional composite plating method. FIG. 7 is a graph showing current density and Si in a conventional composite plating method.
Graph showing relationship with eutectoid of C particles [Explanation of symbols] 1 ... composite plating apparatus for cylindrical member, 2 ... cylindrical member (cylinder block), 2a ... hollow portion (cylinder), 2b ... cylindrical member Inner surface (cylinder inner surface), 10 ... cylindrical electrode, 16 ...
Injection holes, 26: composite plating solution, 27: metal phase (Ni matrix), 28: particles (ceramic particles).

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-10-140390 (JP, A) JP-A-52-109439 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C25D 15/02 C25D 7/04

Claims (1)

(57) [Claim 1] A cylindrical electrode having a plurality of injection holes is disposed in a hollow portion of a cylindrical member, and plating is performed from the plurality of injection holes toward the inner surface of the cylindrical member. While spraying a fixed amount of the composite plating solution mixed with particles into the solution, current is applied to the cylindrical electrode and the cylindrical member, the current density generated by this energization is initially set low, and only the metal phase is applied to the inner surface of the cylindrical member. precipitating, after a predetermined time has elapsed, a composite plating method of the tubular member which eutectoid particles set high current density in the metal phase, when spewing a certain amount of the composite plating solution, the cylindrical electrode
A composite plating method for a tubular member, characterized in that the substrate is rotated at a constant speed .