Surface treatment process of fasteners

Update:27-07-2020
Summary:

The surface treatment of fasteners is a process of arti […]

The surface treatment of fasteners is a process of artificially forming a surface layer on the surface of the base material that is different from the mechanical, physical and chemical properties of the base. The purpose of fastener surface treatment is to meet the product's corrosion resistance, wear resistance, decoration or other special functional requirements.

Micro arc oxidation

Micro-arc oxidation, also known as micro-plasma oxidation, is the combination of electrolyte and corresponding electrical parameters. The surface of aluminum, magnesium, titanium and their alloys rely on the instantaneous high temperature and high pressure generated by arc discharge to grow the matrix metal oxide. Ceramic coating.

Brushed metal

Metal wire drawing is a surface treatment method that forms lines on the surface of the workpiece by grinding products to achieve a decorative effect.

Burn blue

Burning blue is to fill the whole carcass with color glaze, and then take it to a blast furnace with a furnace temperature of about 800℃. The color glaze is melted from a sand-like solid to a liquid, and after cooling, it becomes a brilliant color fixed on the carcass Glaze, at this time, the color glaze is lower than the height of the copper wire, so the color glaze must be filled again, and then sintered, usually four or five times in a row, until the pattern is filled with the filigree pattern.

Spraying

Shot peening is a cold working process that uses pellets to bombard the surface of the workpiece and implant residual compressive stress to improve the fatigue strength of the workpiece.

Sandblasting

Sandblasting is a process of cleaning and roughening the surface of the substrate by the impact of high-speed sand flow, that is, using compressed air as the power to form a high-speed jet beam to spray the blasting material (copper ore, quartz sand, emery sand, iron sand, Hainan sand) at high speed To the surface of the workpiece to be processed, the appearance or shape of the outer surface of the workpiece surface is changed.

Etching

Etching is a technique that uses chemical reaction or physical impact to remove materials. Generally referred to as etching is also called photochemical etching, which refers to the removal of the protective film of the area to be etched after exposure to plate making and development, and contact with chemical solutions during etching to achieve the effect of dissolving and corroding, forming unevenness or hollowing out.

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IMD

IMD is In-Mold Decoration (in-mold decoration technology), also known as coating-free technology. It is an internationally popular surface decoration technology. The surface hardened transparent film, the middle printing pattern layer, the back injection layer, and the ink middle can make the product resistant to friction , Prevent the surface from being scratched, and can keep the color vivid and not easy to fade for a long time.

Laser carving

Laser engraving is also called laser engraving or laser marking, which is a process of surface treatment using optical principles. The laser beam is used to carve a permanent mark on the surface of the material or inside the transparent material.

EDM

Electric discharge machining (EDM) is a special machining method that uses the electric erosion effect generated by the pulse discharge between the two electrodes immersed in the working fluid to ablate conductive materials. It is also called electric discharge machining or electro-erosion machining, abbreviated as EDM in English. Tool electrodes are commonly used with electrical corrosion resistant materials with good conductivity, high melting point and easy processing, such as copper, graphite, copper-tungsten alloy and molybdenum. In the processing process, the tool electrode is also lost, but it is less than the amount of metal erosion of the workpiece, and even close to no loss.

Laser biting

Laser biting uses high-energy density laser to react with the steel surface to form snakeskin/etched patterns/pear ground or other forms of patterns.

Pad printing

Pad printing is one of the special printing methods. It uses steel (or copper, thermoplastic plastic) intaglio plates and uses a curved pad printing head made of silicone rubber materials to dip the ink on the intaglio plate onto the surface of the pad printing head, and then You can print text, patterns, etc. on the surface of the object you need to press.

screen printing

Screen printing is to stretch silk fabric, synthetic fiber fabric or metal mesh on the screen frame, and use hand-carved paint film or photochemical plate making method to make screen printing plate. Modern screen printing technology uses photosensitive materials to make a screen printing plate (make the screen holes of the graphic part of the screen printing plate through holes, and the screen holes of the non-graphic part are blocked. live). During printing, the ink is transferred to the substrate through the mesh of the graphic part by the squeeze of the squeegee, forming the same graphic and text as the original.

Direct thermal printing

Direct thermal printing refers to applying a thermal agent to the paper to make it into thermal recording paper. The thermal recording paper changes the physical or chemical properties of the substance (color developer) under the action of heat to obtain an image One way.

Heat transfer

The principle of thermal transfer is to print a digital pattern on a special transfer paper with a special transfer ink through a printer, and then use a special transfer machine to accurately transfer the pattern to the surface of the product at high temperature and high pressure to complete the product printing. system.

Lithography

Since the graphic part and non-graphic part of the lithographic printing are on the same plane, in printing, in order to make the ink distinguish the pattern part from the non-pattern part of the printing plate, the principle of separation of oil and water is used. The water supply device of the component supplies water to the non-graphic part of the printing plate, thereby protecting the non-graphic part of the printing plate from being wetted by the ink. Then, the ink supply device of the printing part supplies ink to the printing plate. Since the non-graphic part of the printing plate is protected by water, the ink can only be supplied to the graphic part of the printing plate. Finally, the ink on the printing plate is transferred to the nipple, and then the pressure between the squeegee and the impression cylinder is used to transfer the ink on the nipple to the substrate to complete a printing. Therefore, lithography is a kind of Indirect printing method.

Curved printing

Curved printing is to first put the ink into the intaglio with engraved characters or patterns, then copy the characters or patterns onto the curved surface, and then use the curved surface to transfer the characters or patterns to the surface of the molded product, and finally make it through heat treatment or ultraviolet light irradiation. The ink is cured.

Hot stamping

Hot stamping, commonly known as "hot stamping", refers to hot stamping text and patterns of materials such as colored foil on the front or back cover of the hardcover book cover, or embossing various convex and concave book titles or patterns by hot pressing .

Water transfer

Water transfer printing is a kind of printing that uses water pressure to hydrolyze the transfer paper/plastic film with color patterns. The process includes the production of water transfer decals, decal soaking, pattern transfer, drying, and finished products.

Flat screen printing

For flat screen printing, the printing mold is a polyester or nylon screen (pattern) fixed on a square frame with a hollow pattern. Color paste can penetrate through the pattern on the pattern, and the mesh is closed by a polymer film at the non-patterned place. When printing, the pattern is pressed tightly on the fabric, and the color paste is placed on the pattern, which is scraped back and forth with a scraper to make the color paste reach the surface of the fabric through the pattern.

Calender

Calendering is also called calendering. The last process of heavy leather finishing. The plasticity of the fiber under mixed heat conditions is used to flatten the surface of the fabric or roll out parallel fine diagonal lines to enhance the finishing process of fabric gloss. After the material is fed, it is heated and melted, then formed into a sheet or film, and then cooled and rolled up. The most commonly used calendering material is polyvinyl chloride.

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