Small pieces of hot dip galvanized full automatic

High carbon steel, ductile cast iron, malleable cast iron, carbon steel parts and small components

One, introduction

High carbon steel, ductile cast iron, malleable cast iron, cast iron made of a variety of small components, such as electric power fittings, malleable steel, fasteners, steel nails and other small pieces of the structure due to its own characteristics: small size, material C, Si, P content is high, the non metallic inclusion interferes with iron and zinc alloy layer formation. The traditional galvanized temperature is higher, generally at580to 660 DEG C, the temperature zone, liquid zinc on iron solubility will rise sharply, resulting in a large number of zinc and zinc ash, zinc melting pot of short life.

We developed the hot-dip galvanizing process, which is mainly characterized in that:

In1, temperature450to 470 DEG c;

2, zinc liquid added to the Zn containing Al, Sn and other components of the alloy liquid;

3, zinc pot for ceramic heat type;

In 4, heating by electric heating or intermediate frequency induction heating or gas heating molten zinc.

In two, applied technology

1, plating: high carbon steel, ductile cast iron, malleable cast iron, cast iron fittings, malleable pieces, standard parts, all kinds of small components.

2, the temperature of zinc liquid:450~ 475

3, pretreatment method: hydrochloric acid rust, degreasing, acid degreasing, pickling solution degreasing derusting combo.

4, zinc liquid ingredients: pure zinc and zinc base alloys

Three, process flow

1, a, alkali washing, water washing, acid pickling, water washing, drying and hot dip plating aid - - centrifugal zinc throwing, water-cooled, passivation, washing, drying, sorting and packing pieces.

2, a, carbonization oil removal, shot peening derusting, fluxing, drying, hot galvanized, centrifugal zinc throwing, water-cooled, passivation, washing, drying, sorting and packing pieces.

In four, the main equipment

Carbonization except oil furnace, cover belt type shot blast cleaning machine, hanging chain ( or mechanical hand along the rail transport ), pickling device, ceramic zinc pot, continuous drying device, centrifugal vibration device.

In 1, chemical pretreatment:

(1) chemical pretreatment with lifting equipment; allocation of special tools for chemical pretreatment

(2) chemical pretreatment groove ( including alkaline washing, washing, acid pickling, water washing, fluxing tank ) using PP material or corrosion resistant glass steel, stainless steel, corrosion resistant material production.

2, drying: drying furnace by using electric heating or gas heating and hot air drying.

Hot dip galvanizing:

Ceramic zinc pot energy can be electric, oil, gas as the heat source, has the advantages of high efficiency, fast heating, long life etc..

Centrifugal zinc throwing ( not in the centrifuge the workpiece at the edge of the pan vibration removing excess liquid zinc ):

Centrifuge in the removal of small pieces of the surface excess zinc liquid effect is obvious, especially the threaded parts.

Water cooling tank:

Cooling water circulation water is used, there is a certain temperature, but not too much.

Passivation: prevent the workpiece white rust.

Washing: running water

Drying: drying furnace by using electric heating or gas heating and hot air drying.

In five, the production line characteristics

According to the different requirements of users, the design specifications of component hot galvanizing production line to meet customer needs, a variety of investment, fast recovery cost. Can be designed into a fully automatic or semi-automatic production line. Automatic line according to the workpiece varieties to set parameters, the entire process by the PLC control manipulator to complete, stable product quality, high degree of automation, greatly reducing the cost of human resources.