JP3011783B2 - Internal plating equipment 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 a plating apparatus for electroplating an inner surface of a cylindrical member, for example, a cylinder block.

[0002]

2. Description of the Related Art Conventionally, in general, plating on the inner surface of a cylindrical member such as a cylinder block involves the following steps.
This was performed by immersing the cylindrical member in the plating solution.

[0003] However, in the above method, plating is applied to unnecessary portions other than the inner surface of the member, resulting in waste. In addition, since high-speed circulation of the plating solution cannot be performed, a long time is required for plating. Also, a large amount of plating solution was required to immerse the cylindrical member.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus for plating an inner surface of a cylindrical member, which is capable of plating only the inner surface of the cylindrical member with a small amount of plating solution in a short time.

[0005]

According to the present invention, there is provided an apparatus for plating an inner surface of a cylindrical member, the installation table having the cylindrical member installed with the opening directed upward and downward, and a sealing mechanism for closing a lower opening of the installed cylindrical member from below. And a plating mechanism for electroplating the inner surface of the cylindrical member while flowing and circulating a plating solution into the cylindrical member from the upper opening of the cylindrical member. A balloon that is larger than the lower opening and abuts the lower opening peripheral edge so as to close the lower opening periphery from below, and a cloth smaller than the lower opening is embedded in the upper center of the balloon. The plating mechanism has a plating solution jetting part inserted into a cylindrical member at a tip of a vertically movable and rotatable shaft, and the jetting part has a jetting hole having a large number of jetting holes formed on a side surface. Keep the space between the pipe and An anode tube of net which fitted Te, and is characterized in that it is constituted by a plate material which is provided between the jet pipe and the anode tube.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a plating apparatus of the present invention, and FIG.
FIG. Reference numeral 1 denotes a cylinder block which is a cylindrical member, and a plating apparatus of the present invention performs electroplating on an inner surface 11 of the cylinder block 1. 2 is an installation stand. The mounting table 2 extends long in the front-rear direction (the direction of the front and back of the paper), and a receiving tray 21 and a roller 22 are provided on the mounting table 2. The cylinder block 1 is mounted on a pallet 23 movably mounted on rollers 22. Casters 2 are provided on both sides of the bottom frame 24 of the mounting table 2.
5 are attached.

Reference numeral 3 denotes a seal mechanism for closing the internal space 12 of the cylinder block 1 from below. The sealing mechanism 3 includes an air cylinder 31, a hollow shaft 32, and a rubber balloon 33.
And so on. The cylinder 31 is fixed to the installation table 2 downward. The shaft 32 extends vertically through the upper frame 26 and the tray 21 of the installation table 2, and moves up and down in conjunction with the cylinder 31 via a tie plate 34. The balloon 33 is attached to the upper end of the shaft 32, and the lower end of the shaft 32 is
A hose 35 for sending air to the balloons 33 through the air is connected. 36 is a ball bush.

As shown in FIG. 3, the balloon 33 has a substantially rectangular cross section in a contracted state, and a band 38 is formed by externally fitting an opening 33a to a cap 37 at the tip of a shaft 32.
It is fixed at. The edge of the opening 33a has an inward projection 33b, and the cap 37 has a recess 37a into which the projection 33b fits. A cloth 39 is embedded in the upper center of the balloon 33. The cloth 39 is slightly smaller than the lower opening 12b of the internal space 12 of the cylinder block 1, and the cloth 39 prevents the upper central portion of the balloon 33 from extending even when the balloon 33 expands.

Reference numeral 4 denotes a plating mechanism for electroplating the inner surface 11 of the cylinder block 1. Plating mechanism 4
Is composed of a hollow shaft 41, a motor 42, a frame 43 to which these are fixed, an air cylinder 44, a support 45, and the like. FIG. 4 is an enlarged sectional view showing the plating mechanism 4. The frame 43 is a rectangular cylinder when viewed from the front, and the shaft 41 is
3a and the lower frame portion 43b are vertically rotatably fixed through the lower frame portion 43b. A rotary joint 51 is attached to the upper end of the shaft 41. 52 is a housing for fixing the shaft 41 to the upper frame 43a, 53 is a plate for fixing the housing 52,
The shaft 41 is rotatably supported via a bearing 54 of a housing 52. 61 is a housing for fixing the shaft 41 to the lower frame portion 43b, 62 is a plate for fixing the housing 61, and the shaft 41 is rotatably supported via a bearing 63 of the housing 61. 64 is an oil seal, and 65 is a gland packing. The housing 61 has a concave portion 66 at a lower portion, and the concave portion 66 has a plurality of through-holes 67a.
It is closed at 7.

The shaft 41 has a plating solution jetting portion 7 at its lower end.
It has 0. The ejection part 70 has a large number of ejection holes 7 on the side surface.
An ejection pipe 71 formed with 1a, a mesh-shaped anode pipe 72 fitted to the ejection pipe 71 at an interval, and a dissolved electrode plate material such as a Ni mass provided between the ejection pipe 71 and the anode pipe 72. 7
3 is comprised. As the electrode material, a soluble material is preferable, but an insoluble anode plate may be used. The ejection portion 70 is provided so as to be located in the internal space 12 of the cylinder block 1 when the lower end surface of the housing 61 contacts the upper end surface of the cylinder block 1.

A pulley 81 and a snap ring 91 are fixed to a portion between the upper frame portion 43a and the lower frame portion 43b of the shaft 41. Meanwhile, motor 4
A pulley 82 is also fixed to the tip of the second rotating shaft 42a. The pulleys 81 and 82 are connected by a belt 83, and the shaft 41 rotates in conjunction with a motor 42. The snap ring 91 has an upper frame portion 43a as shown in FIG.
A sliding electron 93 fixed via a bracket 92 is fixed to the slider. The positive electrode of a rectifier (not shown) is connected to the sliding electron 93. The cathode of the rectifier is connected to the cylinder block 1.

As shown in FIG. 1, the frame 43 is
5 is mounted on the guide rail 45a so as to be vertically movable. The end of a rod 44a of a cylinder 44 fixed upward to a support 45 is connected to the frame 43, and the frame 43 moves up and down with the shaft 41, the motor 42, etc. in conjunction with the cylinder 44. ing.

The air cylinders 31, 44 and the balloon 33 are operated by air supplied from a common air source.

Next, the operation will be described. First, the cylinder block 1 is installed at a predetermined position on the installation table 2. Next, the seal mechanism 3 is operated. That is, air is supplied to the air cylinder 31 to raise the shaft 32, and the balloon 33 is made to approach the lower opening 12 b of the internal space 12 of the cylinder block 1. Next, the air is removed from the air cylinder 44, the frame 43 is lowered, and the ejection portion 70 of the shaft 41 is inserted into the internal space 12 from the upper opening 12a and positioned in the internal space 12. Next, air is supplied to the balloon 33 to expand the balloon 33, and the balloon 33 is brought into contact with the periphery of the lower opening 12b of the cylinder block 1 from below so as to close the internal space 12 from below. As a result, the lower side of the internal space 12 is sealed.

Next, a plating solution is supplied from a plating solution storage tank 95 (FIG. 2) disposed in the installation table 2 to the ejection portion 70 through a rotary joint 51 and a shaft 41 by a pump (not shown), and is ejected. At the same time, the shaft 41 is rotated by the motor 42. Further, the rectifier is operated to energize the snap ring 91 and the cylinder block 1. For example, the amount of the plating solution is 100 liters / minute, and the rotation speed of the shaft 41 is 20 to 100 rotations / minute.
The setting values of the rectifier are 200 A and 8 V. The plating solution accumulates in the internal space 12 and flows into the concave portion 66 of the housing 61 through the through hole 67a of the current plate 67.
It returns to the tank 95 through the discharge hole 66a (FIG. 4). That is, the plating solution circulates in the internal space 12. Thereby, electroplating is performed on the inner surface 11 of the cylinder block 1.
When the electroplating is completed, the circulation of the plating solution is stopped, the frame 43 is raised, the ejection portion 70 is extracted from the interior space 12, the balloon 33 is contracted, and the shaft 32 is lowered. When the balloon 33 is contracted, the plating solution stored in the internal space 12 flows downward, is received by the receiving tray 21, and returns to the tank 95.

In the above-described apparatus, the lower opening 12b of the internal space 12 of the cylinder block 1 is sealed by using a balloon 33 to circulate the plating solution in the internal space 12. The plating is performed only on the inner surface 11 without immersing 1 in the plating solution. Also, the amount of the plating solution may be small, and the plating time can be circulated at high speed, thereby shortening the working time.

Moreover, since it is sealed by the balloon 33,
Even when the opening 12b to be closed is in a recessed position like the cylinder block 1, the seal is easily and reliably sealed.

Further, the cloth 39 is provided so that the upper center of the balloon 33 does not expand even if it expands. Therefore, the upper portion of the balloon 33 does not protrude into the internal space 12. Therefore, the lower opening 12b of the inner surface 11 does not become a shadow of the balloon 33 which has expanded, and the entire surface of the inner surface 11 is evenly plated.

[0019]

As described above, according to the present invention, the following effects can be obtained.

(1) Since the lower opening 12b of the internal space 12 of the cylinder block 1 is sealed by using a balloon 33 to circulate the plating solution in the internal space 12, the cylinder block 1 is plated as in the prior art. Plating can be applied only to the inner surface 11 without being immersed in the solution. Therefore, the amount of the plating solution used can be reduced. Further, since the plating solution can be circulated at a high speed, the working time can be reduced.

(2) Since the seal is made by the balloon 33, even if the opening 12b to be closed like the cylinder block 1 is located in a deep place, the seal can be easily and surely made.

(3) Even if the balloon 33 expands, the upper center of the balloon 33 is prevented from extending by the cloth 39.
The upper part of 3 does not project into the internal space 12. Therefore, it is possible to prevent the lower opening 12b of the inner surface 11 from being shadowed by the expanded balloon 33, and to evenly coat the entire inner surface 11.

[Brief description of the drawings]

FIG. 1 is a front view showing an internal plating apparatus for a cylindrical member according to the present invention.

FIG. 2 is a view taken in the direction of the arrow II in FIG.

FIG. 3 is a vertical sectional view showing a balloon used in the device.

FIG. 4 is a partially enlarged sectional view of FIG. 1;

FIG. 5 is a view taken in the direction of the arrow V in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder block 11 Inner surface 12a Upper opening 12b Lower opening 2 Installation table 3 Seal mechanism 32 Shaft 33 Balloon 39 Cloth 4 Plating mechanism 41 Shaft 70 Plating solution jetting part 71 Spouting tube 71a Spouting hole 72 Anode tube 73 Dissolving electrode plate material

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Tetsuya Kobayashi 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (56) References JP-A-54-121239 (JP, A) JP-A-50-58138 (JP, A) JP-A-54-121240 (JP, A) JP-A-58-25500 (JP, A) JP-A-48-76216 (JP, U) JP-B-48-33131 (JP, B1) ( 58) Field surveyed (Int. Cl. ⁷ , DB name) C25D 1/00-7/08 C25D 17/00 C25D 17/12

Claims (1)

(57) [Claims] An installation base on which a cylindrical member is installed with its opening facing up and down, a sealing mechanism for closing a lower opening of the installed cylindrical member from below, and a cylindrical member from an upper opening of the cylindrical member. A plating mechanism for performing electroplating on the inner surface of the cylindrical member while flowing and circulating a plating solution therein, and the sealing mechanism has a rubber balloon at a tip end of a vertically movable shaft,
The balloon inflated larger than the lower opening is brought into contact with the periphery of the lower opening so as to close from below, and a cloth smaller than the lower opening is embedded in the upper center of the balloon. At the tip of a vertically rotatable and rotatable shaft, there is provided a plating solution jetting portion inserted into the cylindrical member, the jetting portion is provided with an ejection pipe having a large number of ejection holes formed on the side surface, An inner plating apparatus for a cylindrical member, comprising: a mesh-shaped anode tube fitted outside with a separator; and an electrode plate material provided between the ejection tube and the anode tube.