CN215209669U

CN215209669U - Device for plating chromium on surface of oil ring

Info

Publication number: CN215209669U
Application number: CN202121127259.4U
Authority: CN
Inventors: 石建明
Original assignee: Nanjing Feiyan Piston Ring Co ltd
Current assignee: Nanjing Feiyan Piston Ring Co ltd
Priority date: 2021-05-25
Filing date: 2021-05-25
Publication date: 2021-12-17
Anticipated expiration: 2031-05-25

Abstract

The utility model discloses a device for oil ring surface chromium plating, including the core bar, the periphery cover of core bar is equipped with the thermal expansion section of thick bamboo that is heated the inflation at the in-process of chromium plating, and thermal expansion section of thick bamboo periphery is located to the oil ring cover, thereby the thermal expansion section of thick bamboo compresses tightly with the inner wall of oil ring after being heated the inflation and prevents the plating bath in the oilhole department flow of oil ring. The utility model discloses the cover has a thermal expansion section of thick bamboo on the core bar and can once only block up the oilhole on a plurality of oil rings, has separated the flow of plating solution in oilhole department, compares and sets up the rubber circle in the oilhole of every oil ring among the prior art, reduces the cost and the operation degree of difficulty by a wide margin. And the rubber ring is installed to the oilhole on every oil ring of current device is whole to be required about 10 minutes, and the utility model discloses the installation thermal expansion section of thick bamboo only needs about 2 minutes.

Description

Device for plating chromium on surface of oil ring

Technical Field

The utility model relates to a device of electroplating on the work piece especially relates to a device that is used for oil ring surface chromium plating.

Background

At present, chromium-plated oil rings of piston rings mainly comprise two types, one type is cast iron chromium-plated oil rings, and the other type is steel chromium-plated oil rings. Both cast iron and steel oil rings are coated with a chromium layer with a certain thickness on the surface to increase the wear resistance. At present, the raw material of the steel oil ring is an outsourcing section bar, and the section bar is provided with an oil scraping belt, a spring groove, an oil hole and the like, so that the oil scraping belt, the spring groove, the oil hole and the like do not need to be processed as the cast iron oil ring in the manufacturing process. However, since the profile is provided with the oil hole, electroplating solution flows inside and outside the oil hole during electroplating, so that the oil hole cannot be plated with the chromium layer, the color of the oil hole is gray black, the oil hole is also called as a panda eye, the appearance quality of the oil ring is seriously affected by the panda eye, especially the foreign trade ring has higher requirement on the appearance quality, and the existing chromium-plated steel oil ring is mainly a foreign trade ring.

The existing solution is mainly to install a rubber ring in the oil hole on the oil ring, although the plating solution can be prevented from entering the oil hole to a certain extent, a rubber ring needs to be installed in each oil hole on the oil ring, and the existing solution is complex in work, low in efficiency, high in cost and not beneficial to large-scale production.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: the utility model aims at providing a device for oil ring surface chromium plating with low costs, easy operation.

The technical scheme is as follows: a device for oil ring surface chromium plating, including the core bar, the periphery cover of core bar is equipped with the thermal expansion section of thick bamboo that is heated the inflation at the in-process of chromium plating, and the oil ring cover is located thermal expansion section of thick bamboo periphery, thereby the thermal expansion section of thick bamboo compresses tightly with the inner wall of oil ring after being heated the inflation and prevents the plating bath in the oilhole department flow of oil ring.

Preferably, a gap is left between an outer wall of the thermal expansion cylinder and an inner wall of the oil ring.

Preferably, the outer diameter of the thermal expansion cylinder is determined in accordance with the expansion coefficient of the thermal expansion cylinder and the outer diameter of the oil ring, the radial thickness of the oil ring.

Preferably, the radial expansion amount of the thermal expansion cylinder is determined according to the outer diameter of the thermal expansion cylinder, the expansion coefficient of the thermal expansion cylinder, the temperature corresponding to the temperature of the plating solution and the expansion coefficient of the thermal expansion cylinder.

Preferably, one or more oil rings are fitted around the outer periphery of the thermal expansion cylinder.

The length of the thermal expansion cylinder is at least as same as the thickness of an oil ring sleeved on the thermal expansion cylinder.

Preferably, the material of the thermal expansion cylinder is a thermoplastic resin material; the material of the thermal expansion cylinder is an anti-corrosion material. More preferably, the thermal expansion cylinder is a nylon cylinder.

Preferably, the thermal expansion cylinder has an expansion coefficient of 14 to 16 × 10^-5。

Has the advantages that: compared with the prior art, the utility model, gain as follows and show the effect: 1. the core bar is sleeved with the thermal expansion cylinder, so that the oil holes in the plurality of oil rings can be blocked at one time, the flow of electroplating solution at the oil holes is blocked, and compared with the prior art in which a rubber ring is arranged in each oil hole of each oil ring, the cost and the operation difficulty are greatly reduced; 2. the thermal expansion cylinder is an elastic cylinder, and compared with a non-elastic cylinder, the blocking effect is better. 3. The thermal expansion cylinder can be recycled, so that the cost is further reduced; 4. the thermal expansion cylinder is not limited by strict matching of the aperture size of the oil ring, and the length of the thermal expansion cylinder is only required to be larger than or equal to the total thickness of the oil ring sleeved on the thermal expansion cylinder. 5. The specific size of the thermal expansion cylinder is manufactured according to the size of the oil ring and the expansion property of the thermal expansion cylinder, and then the thermal expansion cylinder is sleeved on the periphery of the core rod, so that the production efficiency is high.

Drawings

FIG. 1 is a schematic view of the structure of the device of the present invention;

fig. 2 is a partially enlarged structural schematic view of an oil ring and a thermal expansion cylinder;

FIG. 3 is a schematic structural view of a thermal expansion cylinder;

FIG. 4 is a schematic structural view of the thermal expansion cylinder after the chromium plating is finished;

fig. 5 is a schematic structural view of an oil ring.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in FIGS. 1-3, the present invention discloses an oil ring3 device of chromium plating, including core bar 1, the periphery cover of core bar 1 is equipped with the thermal expansion section of thick bamboo 2 that is heated the inflation in the chromium plating process, and the periphery is located to thermal expansion section of thick bamboo 2 to oil ring 3 cover, thereby the thermal expansion section of thick bamboo 2 is heated the inflation back and is compressed tightly with the inner wall of oil ring 3 and prevent that the plating solution from getting into in the hole on the oil ring 3 wall. A gap is left between the outer wall of the thermal expansion cylinder 2 and the inner wall of the oil ring 3. The outer diameter of the thermal expansion cylinder 2 is determined by the expansion coefficient of the thermal expansion cylinder 2, the outer diameter of the oil ring 3, and the radial thickness of the oil ring 3. The radial expansion amount of the thermal expansion cylinder 2 is determined according to the outer diameter of the thermal expansion cylinder 2, the expansion coefficient of the thermal expansion cylinder 2, the temperature of the plating solution, and the temperature corresponding to the expansion coefficient of the thermal expansion cylinder 2. A plurality of oil rings 3 may be simultaneously fitted on the outer periphery of the thermal expansion cylinder 2. The length of the thermal expansion cylinder 2 is at least as long as the thickness of an oil ring 3 fitted around the thermal expansion cylinder 2. The thermal expansion cylinder 2 of the present embodiment is a nylon cylinder, and the material of the thermal expansion cylinder 2 may be other thermoplastic resin material, and is preferably an anticorrosive material. The thermal expansion cylinder 2 has an expansion coefficient of 14 to 16X 10^-5. And the upper end and the lower end of the core bar 1 are provided with pressing plates 4 for pressing the oil rings 3, and the upper pressing plate and the lower pressing plate 4 are locked by locking nuts 5.

The working process is as follows: the method for plating chromium on the oil ring by using the device comprises the following steps:

(1) taking an oil ring 3 made of chrome-plated steel for foreign trade, the diameter of the cylinder is

The radial thickness of the ring is 3.0, and the diameter of the inner diameter of the oil ring 3 after clamping is as follows: d inner diameter 139.7-3.0 × 2 133.7;

wherein, the calculation formula of the inner diameter of the oil ring D is as follows: d inner diameter (dEx-2T)

As shown in fig. 5, D is the outer diameter of the oil ring, which is determined by the cylinder diameter of the engine used, and is equal to the cylinder diameter of the engine, and T is the radial thickness of the oil ring;

(2) preparing nylon cylinder with expansion coefficient of 14-16X 10^-5The median value was taken to be 0.00015. Since the inner diameter of the oil ring 3 is

Therefore, the nylon cylinder is plated with chrome liquid at 60 DEG CThe medium radial expansion amount is as follows: 133.7 × 0.00015 × (60-20) ═ 0.8022, so the actual outside diameter of the nylon tube 2 was designed to be: 133.7-0.8022+0.10 is 132.99, and +0.10 is convenient for the inner diameter of the nylon cylinder to cling to the ring after expansion, so that the oil hole can be better sealed;

wherein, the formula for calculating the radial expansion amount of the nylon cylinder is as follows: (D outer-2X T) X0.00015X (60-20)

60 is the temperature of the chromium plating solution, and 20 is the temperature when the nylon expansion coefficient is 0.00015;

(3) processing the nylon cylinder 2 according to the actual outer diameter of the nylon cylinder 2 calculated in the step (2), firstly installing the nylon cylinder 2 on the chromium plating core rod 1, then installing an oil ring 3 to be subjected to chromium plating on the excircle of the nylon cylinder 2, finally closing the oil ring in a cage, tightly pressing the oil ring by a pressing plate 4, and locking by a locking nut 5; putting the chrome plating core bar 1 provided with the oil ring 3 into plating solution at 60 +/-2 ℃ for electroplating treatment;

(4) after the plating is completed, the oil ring 3 and the nylon tube 2 are taken out, and the surface of the nylon tube 2 is shown in FIG. 4.

As can be seen from FIG. 4, the surface of the nylon cylinder 2 has traces of contact with the inner circular surface of the oil ring 3, which shows that the nylon cylinder 2 seals the oil hole on the oil ring 3, thereby preventing the plating solution from entering the oil hole on the oil ring 3 and preventing the plating solution from flowing through the oil hole of the oil ring 3. Thereby avoiding the generation of panda eyes on the oil ring. In addition, the cost of using one nylon tube is only about 20 yuan, the cost of installing a tube ring by using an O-shaped rubber ring is about 500 yuan, and the cost is greatly reduced.

Claims

1. The device for chrome plating of the surface of the oil ring comprises a core bar (1), and is characterized in that a thermal expansion cylinder (2) which is heated to expand in the chrome plating process is sleeved on the periphery of the core bar (1), the oil ring (3) is sleeved on the periphery of the thermal expansion cylinder (2), and the thermal expansion cylinder (2) is pressed against the inner wall of the oil ring (3) after being heated to expand so as to prevent plating solution from flowing at an oil hole of the oil ring (3).

2. Device for the chrome plating of oil ring surfaces according to claim 1, characterized in that a clearance is left between the outer wall of the thermal expansion cylinder (2) and the inner wall of the oil ring (3).

3. The device for oil ring surface chromium plating according to claim 1, characterized in that the outer diameter of the thermal expansion cylinder (2) is determined in accordance with the expansion coefficient of the thermal expansion cylinder (2) and the outer diameter of the oil ring (3), the radial thickness of the oil ring (3).

4. The device for chrome plating of oil ring surface according to claim 1, wherein the amount of radial expansion of the thermal expansion cylinder (2) is determined according to the outer diameter of the thermal expansion cylinder (2), the expansion coefficient of the thermal expansion cylinder (2), and the temperatures corresponding to the plating solution temperature and the expansion coefficient of the thermal expansion cylinder (2).

5. The device for the chrome plating of the oil ring surface as recited in claim 1, wherein the length of the thermal expansion cylinder (2) is at least the same as the thickness of the oil ring (3) sleeved on the thermal expansion cylinder (2).

6. The device for oil ring surface chromium plating according to claim 1, characterized in that one or more oil rings (3) are fitted around the outer periphery of the thermal expansion cylinder (2).

7. The device for chrome-plating of oil ring surfaces as set forth in claim 1, characterized in that the material of the thermal expansion cylinder (2) is a thermoplastic resin material.

8. The device for the chrome plating of the oil ring surface according to claim 1, characterized in that the material of the thermal expansion cylinder (2) is a corrosion-resistant material.

9. The device for the chrome plating of the oil ring surface according to claim 1, characterized in that the thermal expansion cylinder (2) is a thermal expansion elastic cylinder, which is a nylon cylinder.

10. Device for the chrome plating of the oil ring surface according to claim 1, characterized in that the thermal expansion cylinder (2) has an expansion coefficient of 14-16 x 10^-5。