Lubricant for use in press working of a metal material and a press working method of a metal material using the same

Abstract

A non-chlorine type lubricant in which a sulfur type extreme pressure additive, an organic zinc compound, a calcium type additive, and an ester compound are blended with a base oil for the lubricant, and having a kinetic viscosity from 5 to 50 mm2 / s at 40° C.

Description

BACKGROUND OF THE INVENTION[0001]The present invention concerns a non-chlorine type lubricant for use in press working of metal materials. Specifically, it relates to a lubricant suitable to press working of metal materials that are to be used as parts, such as oil filter cases, applied with a coating treatment after press working. Further, it relates to a press working method of metal materials using the lubricant.[0002]Upon press working of a metal material, a lubricant is generally supplied between a tool and the metal material. This is for avoiding occurrence of cracks or seizing in a work due to insufficient lubrication or deterioration of a working life of a die due to increase of friction. In shearing as a sort of the press working, a metal material is fabricated by punching it using a die and a punch. Accordingly, in a shearing process such as fine blanking (FB working), larger stresses are generated between the tool and the metal material than that in other pressing or mach...

AI Technical Summary

Benefits of technology

[0006]A lubricant according to the present invention has a non-chlorine type composition in which (a) a sulfur-type extreme pressure agent, (b) an organic zinc compound, (c) a calcium type additive, and (d) an ester type compound are blended with a lubricant base oil. This can provide a lubricant not giving undesired effects on a tool working life and gentle to environment, as well as providing excellent lubricity and anti-seizure property. Particularly, even in a case where the kinetic viscosity of the lubricant is relatively low, satisfactory lubricity and anti-seizure property can be provided. In addition, the kinetic viscosity at 40° C. is controlled to 5 to 50 mm2 / s (cSt). In a case where the kinetic viscosity at 40° C. is controlled within the range described above, since the lubricant has an appropriate fluidity, the lubricant can be cleaned easily after the working and cleaning with alkali ion water is also possible while ensuring good lubricancy and anti-seizure property also in the shearing. Accordingly, undesired effects on the subsequent steps such as plating step or coating step can be suppressed effectively.

[0008]Further, the invention can provide a press working method of a metal material including a step of conducting work while supplying the lubricant between a metal material and a tool. As the metal material, anti-rust steel sheet (preferably, electrolytic zinc plated steel sheet) is used. Shearing is applied while supplying the lubricant between the tool and the metal material. After the Shearing, the metal material is cleaned with an alkali ion water heated to 60° C. to 80° C. Then, the metal material is applied with a coating treatment. In a case where the metal material is an anti-rust steel sheet, there is no requirement to ensure high anti-rust preventing property in the lubricant thereby also avoiding an increase of the cost and increase of the viscosity of the lubricant. In a case where the alkali ion water is heated to 60° C. to 80° C., the cleaning property of the lubricant is improved. In a case where cleaning with the alkali ion water is possible, the detergent cost can be decreased and the cleaning step is facilitated.

Problems solved by technology

However, for when using a chlorine type lubricant, a problem can occur when the ingredients of the chlorine type additives in the lubricant decompose during working or after working with time causing rust in the metal material or the tool.

Further for the chlorine type lubricant, a problem can occur by causing generation of deleterious substances or corrosion, damages, etc. to incineration furnace during incineration.

However, such lubricants are used in machining and still leaves the above stated problems in view of the seizure resistance or the lubricity of lubricants for use in press working of metal materials.

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