Quenching oil capable of enabling screw to blacken automatically after quenched and quenching method thereof

Abstract

The invention discloses quenching oil capable of enabling an screw to blacken automatically after quenched and a quenching method thereof. The invention belongs to the field of metal heat treatment technology. The quenching oil comprises the following components, by weight, 35-40 parts of refined base oil, 6-10 parts of cooling catalyzed composite agent, 0.4-0.6 parts of blackening composite agent, 0.3-0.7 parts of brightening agent, 0.4-0.7 parts of surface activating agent and 0.02-0.04 parts of antioxidant. The cooling catalyzed composite agent is a mixture of dialkyl naphthalene and petroleum sulfonate; the blackening composite agent the mixture of short oil alkyd resin, colouring agent and wetting agent; the brightening agent is the mixture of imidazoline oleate and methyl terpene resin; the surface activating agent is span-80. The colouring agent is disperse black 9; the wetting agent is fatty alcohol-polyoxyethylene ether. The best using temperature of the quenching oil is between 75 DEG C and 80 DEG C. Between 75 DEG C and 80 DEG C, the cooling speed of the quenching oil for the screw is moderate, the surface can be blackened automatically and a protective film can be formed while the quenching, so that the processes can be reduced and the efficiency can be improved.

Description

technical field [0001] The invention belongs to the technical field of metal heat treatment, and more specifically relates to a quenching oil and a quenching method capable of making screws self-blacken after quenching. Background technique [0002] Nails refer to pointed hard metals, usually made of steel, and their main purpose is to fix objects such as wood. Nails have different shapes due to their many uses, mainly including special steel nails, drywall screws and drill tail screws. The drywall screw series is one of the most important categories in the entire fastener product line. The name of the drywall screw is directly translated from the English Drywall Screw. Its biggest feature in appearance is the shape of the horn head, which is divided into two lines. Fine-tooth drywall screws and single-thread coarse-tooth drywall screws, the biggest difference between the two is that the thread of the former is double thread, which is suitable for the connection between the...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems that the existing quenching oil cannot uniformly form a film on the surface of the screw and the blackened film is not dense when quenching the screw, the present invention provides a quenching oil and a quenching method that can make the screw self-blackening after quenching. Quenching oil is specially developed for screws. It perfectly combines the two processes of heat treatment and surface treatment. It can not only ensure the surface hardness and internal metallographic structure of the screws, but also form a dense protective film on the surface of the screws. To beautify the appearance and short-term anti-rust effect, save resources, reduce procedures and improve efficiency