JPS6127466B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a surface treatment device for piston rings used in engines and other equipment.

Conventionally, this type of piston ring was generally used with chrome plating applied to its surface.
Since the chrome plating layer has relatively poor wear resistance and requires a large number of processing steps, it is desirable to cover the ring with a wear-resistant material such as titanium nitride by a simple means and in a way that does not deform the ring. .

The present invention aims to satisfy such a demand, and is a pulley-shaped holder in which a rotating shaft is installed horizontally above a titanium or other evaporation source in a vacuum processing tank, and a negative high potential is applied to the rotating shaft. One or more grooves are formed on the outer periphery of the holder, and a piston ring is fitted into the grooves. To explain one example of the present invention with reference to the drawings, the first
In the figure, 1 is a vacuum processing tank, 2 is an evaporation source provided below the processing tank 1 and containing molten titanium 3;
Reference numeral 4 indicates a rotating shaft installed horizontally above the evaporation source 2, and the rotating shaft 4 is attached to a surrounding frame 6 that can be taken in and out from one side wall 5 of the processing tank 1, which can be opened and closed, for example, as shown in FIG. As shown, three of them are arranged in parallel and are rotationally connected by a gear 7 at one end. The enclosure frame 6 has its bottom open to allow ions from the evaporation source 2 below to flow freely, and is supported by wheels 8 and positioned on the rails 9 on the inner wall of the treatment tank 1. did. 10 indicates a drive shaft inserted through the other side wall 11 of the processing tank 1;
This is the drive motor 12 installed outside the processing tank 1.
When driven through the chain 13, its rotation is transmitted to one of the connected rotating shafts 4 via the coupling 14, and further rotates the other rotating shafts 4 via the gear 7. . Each rotating shaft 4 has a holder 16 made of a pulley-shaped conductor, for example.
A plurality of piston rings 17 are fitted into the grooves 16a formed on the outer periphery of each holder 16, and the piston rings 17 are connected to the rotation shaft 4 and the conductive material 1.
A negative high potential from 5 is applied.
Note that the outer diameter of the holder 16 is the same as that of the piston ring 17.
It is preferable to form the ring 17 to be slightly larger than the inner diameter of the ring 17 so as not to cause large deformation when fitting the ring 17 therein.

The width of the outer peripheral surface of the holder 16 is made larger than the width of the piston ring, so that when the holder with the piston ring set is inserted and fixed onto the rotating shaft 4, there is a suitable gap between the piston rings, which is the wear surface of the piston ring. The structure may be such that titanium nitride ion plating can also be performed on the side surfaces. In this case, the groove 16a is not limited to one line, but it is also conceivable to provide a plurality of grooves at appropriate intervals.

Furthermore, in the illustrated embodiment, heater units 19, 19 are provided above and below the surrounding frame 6, and are retractable into the recesses 18, 18 of the side wall 11, thereby heating the piston ring 17, and then applying the evaporation source 2. For ion plating from
9 is accommodated in each recess 18 and provided therein, and after ion plating, the piston ring 17 faces the wall surface of the processing tank 1 provided with the cooling pipe 31 so as to be rapidly cooled. Further, the evaporation source 2 is provided with wheels 20, 20 so that it can be moved left and right within the processing tank 1, and at the same time as this movement, the evaporation source 2
The hollow hot cathode type electron gun 21 hanging directly above the evaporation source 2 is also configured to be moved. This enables efficient and uniform coatings of titanium nitride, titanium carbide, etc. to be formed. Reference numeral 22 denotes a cart for laterally removing the side wall 11 together with the auxiliary equipment of the processing tank 1, which is equipped with the drive motor 12, the cylinders 23, 23 for removing the heater units 19, 19, the evaporation source 2, and the hollow hot cathode type. An electric motor 24 for moving the electron gun 21 left and right is mounted. Reference numerals 25 and 25 indicate a pair of right and left screw rods that are rotated by the electric type 24, and as the screw rods are rotated, the connecting rods 27, 27, which are integral with the slide member 26 screwed thereon, move in and out of the processing tank 1. The evaporation source 2 and the electron gun 21 at the tip thereof are moved left and right.
28 is a stopper for immovably fixing the trolley 22; 29;
is a vacuum exhaust hole connected to the vacuum pump 30, and 31 is a cooling pipe.

To explain its operation, the rotating shaft 4 and the surrounding frame 6 are taken out from the outside of the vacuum processing tank 1, and the surrounding frame 6 is
The holder 16 with the piston ring 17 fitted into the groove 16a on the outer periphery is inserted into the rotating shaft 4 taken out from the rotary shaft 4, and then the holder 16 is reattached to the surrounding frame 6 to complete the preparation. and a surrounding frame 6 etc. are housed inside the processing tank 1 via the openable and closable side wall 5, and one of the rotating shafts 4 is connected to the drive shaft 1.
Connect to the coupling ring 14 at the tip of 0. In this case, the piston ring 17 is roughly degreased by being immersed in an organic solvent as needed, then degreased with a neutral or weak alkaline detergent with a pH not exceeding 10, and then washed with water, immersed in Freon or other drying liquid, and dried. An ultrasonic vibrator can be used in conjunction with each treatment step as needed.

Subsequently, the vacuum pump 30 is operated to remove the processing tank 1.
While evacuating the inside, the recess 1 of the side wall 11 on the other side
Heater unit 19,1 protruding from 8,18
Piston ring 1 on rotating shaft 4 being rotated by 9
7 is heated to approximately 150°C to 200°C. After the piston ring 17 is heated, the heater units 19, 19 are moved out, and the metal is melted and evaporated by supplying an electron beam from the hollow hot cathode electron gun 21 to the evaporation source 2. The piston ring 17 is connected to the drive shaft 10 without being inhibited by the piston ring 19 and has a negative high potential.
It is attached to the entire outer periphery and side surface of the piston ring 17, which rotates integrally with the rotating shaft 4. Thereafter, the piston ring 17 is cooled relatively quickly by the wall surface having the cooling pipe 31 and taken out from the processing tank 1.

As described above, according to the present invention, a pulley-shaped holder with a groove formed on the outer periphery and a negative potential applied thereto is removably inserted into the rotating shaft installed horizontally in the vacuum processing tank.
Since the piston ring is fitted into the groove, titanium nitride can be plated almost evenly around the entire circumference of the ring, and since the ring is fitted onto the rotating shaft and treated at low temperature, no deformation occurs during surface treatment. This has the effect of improving the durability without causing any damage.

[Brief explanation of the drawing]

Fig. 1 is a cutaway front view of one example of the device of the present invention;
Figures 3 and 3 are enlarged right and left side views, Figure 4 is a plan view taken along the line - - of Figure 1, and Figure 5
The figure is a perspective view of the rotating shaft. 1... Vacuum processing tank, 2... Evaporation source, 4... Rotating shaft, 1
6...Holder, 16a...Concave groove, 17...Piston ring.

Claims (1)

[Claims] 1 A pulley-shaped holder with a rotating shaft horizontally installed above the titanium or other evaporation source in the vacuum processing tank and a negative high potential applied thereto is removably inserted, and one or more strips are attached to the outer periphery of the holder. A piston ring surface treatment device comprising a groove in which a piston ring is fitted.