Lubricant for machining, additive for machining, and machining method

Abstract

Provided is a lubricant for machining aluminum alloys and the like which exhibits superior seizure resistance. The lubricant for machining according to the present invention is interposed between the coated surface of a machining tool coated with an amorphous carbon film and the surface to be machined of a material to be machined which comprises aluminum or an aluminum alloy material and is to be machined by contact with the coated surface. The lubricant for machining is characterized in that 100 mass% of the lubricant comprises 8-50 mass% of a macromolecular compound having a molecular weight of 8,000-1,000,000 and having surface functional groups consisting of at least one type of group among carbonyl groups, amino groups, carboxyl groups and hydroxyl groups. Such a macromolecular compound having a high molecular weight strongly adheres to an amorphous carbon film or the like on a machining tool. As a result, the presence of the lubrication film between the machining surface and the surface to be machined is ensured, thereby inhibiting the direct contact of the surfaces and thus seizing, even when aluminum alloys, which are highly susceptible to seizing, are highly deformed.

Description

technical field [0001] The present invention relates to a machining lubricant capable of strong machining of aluminum-based metals without occurrence of sintering, machining additives used in the machining lubricant, and a machining method using them. Background technique [0002] In order to produce high-quality components at low cost, high processability is required. For example, in the case of cold plastic working such as forging, thinning, and drawing, it is required to increase the amount of deformation per time to improve productivity, maintain the quality of the processed surface, and extend the life of expensive processing tools. For this reason, it is important to reduce the coefficient of friction between the processing tool and the material to be processed and to improve the seizure resistance. Therefore, conventionally, a hard film having an effect of reducing the coefficient of friction is provided on the surface of a processing tool such as a mold, or various ...

AI Technical Summary

Problems solved by technology

However, the formation of a solid lubricating coating requires chemical conversion treatment (see Patent Document 1 below) or a heating and drying process of metal soap, which is costly.

In addition, solid lubricating coatings often contain P and Zn, which are environmentally harmful elements, and it is desirable to suppress their use in view of recent environmental problems.

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