Device for plating chromium on surface of oil ring

Abstract

The invention discloses a device for plating chromium on the surface of an oil ring. The device comprises a core rod, the periphery of the core rod is sleeved with a thermal expansion cylinder which expands when heated in the chromium plating process, the periphery of the thermal expansion cylinder is sleeved with the oil ring, and the thermal expansion cylinder is compressed with the inner wall of the oil ring after being heated and expanded so as to prevent a plating solution from flowing at an oil hole of the oil ring. The core rod is sleeved with the thermal expansion cylinder, oil holes in multiple oil rings can be blocked at a time, flowing of electroplating liquid at the oil holes is blocked, and compared with the prior art that a rubber ring is arranged in the oil hole of each oil ring, the cost and the operation difficulty are greatly reduced. The installation of the rubber rings in all oil holes in the oil rings by an existing device takes about 10 minutes, and the installation of the thermal expansion cylinder in the device for placing chromium on the surface of the oil ring only takes about 2 minutes.

Description

technical field [0001] The invention relates to a device for electroplating on workpieces, in particular to a device for chrome plating on the surface of an oil ring. Background technique [0002] At present, there are mainly two types of chrome-plated oil rings for piston rings, one is cast iron chrome-plated oil rings, and the other is steel chrome-plated oil rings. Whether it is cast iron or steel oil ring, a certain thickness of chromium layer is plated on its surface to increase its wear resistance. At present, the raw material of the steel oil ring is a purchased profile, which is equipped with oil strips, spring grooves and oil holes, so it is not necessary to reprocess the oil strips, spring grooves and oil holes in the manufacturing process like cast iron oil rings. oil hole etc. However, because the profile itself has its own oil hole, the electroplating solution flows inside and outside the oil hole during electroplating, so that the chromium layer cannot be pla...

AI Technical Summary

Problems solved by technology

However, because the profile itself has its own oil hole, the electroplating solution flows inside and outside the oil hole during electroplating, so that the chromium layer cannot be plated on the oil hole. Therefore, the color of the oil hole is gray black. Such an oil hole is also called "panda". This kind of "panda eye" has seriously affected the appearance quality of the oil ring, especially the foreign trade ring has high requirements on the appearance quality of the ring, and the current chrome-plated steel oil ring is mainly used for foreign trade rings.

[0003] And existing solution mainly is to install rubber ring in the oil hole on the oil ring, although can stop coating solution from entering oil hole to a certain extent, but a rubber ring will be installed in each oil hole on the oil ring, The work is cumbersome, the efficiency is low, and the cost is high, which is not conducive to large-scale production

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