Method for making sliding part and said sliding part

Abstract

The invention provides a method for manufacturing sliding parts which easily forms an oil sump for increasing a cycle for supplying a lubricant to make the seizing last longer and sliding parts with oil deposits. In the method for manufacturing a needle thread take-up shaft, a Cr coating film 29 and a DLC coating film 30 are continuously formed in positions corresponding to the sliding parts on the surface of a base material 27 by UBM sputtering in a metallic film forming process and a DLC film forming process. A masking member 34 with a plurality of circular holes 35 is fitted to make close contact with the surface of the DLC coating film 30 in a masking process. A recessed part 31 to be the oil sump 32 is formed by performing plasma etching on an area of the DLC film 30 exposed through the hole 35 of the masking member 34 in an etching process.

Description

technical field [0001] The present invention relates to a method for manufacturing a sliding part and a sliding part, and more particularly, to a method for manufacturing a sliding part and a sliding part in which non-sintering properties are improved by forming an oil reservoir in a sliding part. Background technique [0002] Conventionally, for example, in a sewing machine, a plurality of sliding parts are slidably assembled with each other. In these sliding parts, in order to prevent seizing of the sliding part and reduce wear, lubricating oil is generally supplied to the sliding part or a coating having high wear resistance is formed on the surface of the sliding part. [0003] For example, Japanese Patent Application Laid-Open No. 2003-111990 (see FIGS. 5 to 8 ) discloses a sewing machine in which a DLC coating (Diamond Like Carbon coating) is formed on the surface of a sliding portion of a needle bar corresponding to a sliding component. It is known that the DLC coati...

AI Technical Summary

Problems solved by technology

However, even if lubricating oil is supplied to the sliding part of the needle bar and the needle bar supporting member, since the surfaces of the sliding parts slide against each other, the lubricating oil cannot be held in the sliding part for a long time. In a short time (for example, less than 1000 hours), the sliding part will be sintered

[0006] In order to prevent the sintering of the sliding part, it is enough for the operator to frequently supply the lubricating oil to the sliding part. However, generally, there are many parts of the sliding part on the sewing machine, and there are parts where the lubricating oil cannot be simply supplied, so this The job requires a lot of labor

Therefore, it is conceivable to form an oil reservoir made of concave-convex grooves on the DLC film so that the lubricating oil does not flow out from the sliding part in a short time. However, since the DLC film is generally several μm in thickness, It is very difficult in terms of precision to form the unevenness by machining such as cutting.

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