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Galvanized sheet is a steel plate with a zinc coating on its surface. Galvanizing is an economical and effective anticorrosive method which is often used. About half of the world's zinc production is used in this process.

1. Definition of China Galvanized Steel Roofing Sheet for sale is coated with zinc metal to prevent corrosion on the surface of steel sheet and prolong its service life. This kind of thin galvanized steel sheet is called galvanized steel sheet.

2. The classification and use of galvanized sheets can be divided into the following categories according to production and processing methods:

A. The hot dip galvanized steel coil for sale. The thin steel plate is immersed in the molten zinc bath to make its surface adhere to a layer of zinc thin steel plate. At present, continuous galvanizing process is mainly used to produce galvanized steel sheets, that is, coiled steel sheets are continuously immersed in galvanized bath to produce galvanized steel sheets.

B. Galvanized steel sheet. The galvanized steel sheet produced by electroplating has good processability. However, the coating is thinner and the corrosion resistance is not as good as that of hot dip galvanized sheet.

C. Single-sided and double-sided galvanized steel sheets. One-sided galvanized steel sheet, that is, only one-sided galvanized products. It has better adaptability than double-sided galvanized sheet in welding, painting, anti-rust treatment and processing. In order to overcome the shortcomings of single-sided galvanized sheet, there is another kind of galvanized sheet coated with thin zinc on the other side, that is, double-sided difference galvanized sheet.

How to prevent metal from eroding China Wave Type Galvanized Corrugated Steel Sheet? There are many common methods. It is a very effective method to plate one or more layers of metal that is not easily rusted to isolate the air from the steel surface. Among the various metals plated, the price of galvanized steel sheets is not too high, and the steel sheet with the best rust prevention ability.

Why is the zinc coating very good against rust? First, China Galvanized Steel Roofing Sheet manufacturer introduces the zinc itself. Zinc is a blue-white metal with a density of 7.14 g/cm3, a relative atomic mass of 65.37, an atomic number of 30, and a melting point of 19.58 T. It becomes a vapor when it is redundant, and the hardness of zinc is 490 MPa. It is very brittle at normal temperature, but it has good ductility at 100~150. Zinc forms a very thin oxide film in the air, or a very thin basic zinc carbonate film, which prevents the zinc layer from being further oxidized.

Zinc is a very active amphoteric metal – soluble in both acid and alkali.

Since zinc is an amphoteric metal (that is, it is afraid of acid and alkali), how does it protect steel from rust? How can it prevent itself from being tempted? The original rust prevention lies in steel and zinc coating. A micro battery is formed between them.

First, the zinc coating is plated on the surface of the steel. At this time, the liquid (sulfurous acid or carbonic acid, etc.) formed by the aggressive gas in the atmosphere is only in contact with the zinc and electrochemically reacts with the zinc.

When there are pores or defects in the zinc coating, the acidic aqueous solution in the atmosphere enters the steel and zinc layer along the pores or defects. At this time, the zinc-iron-acid solution formed a complete microbattery.

The hot sale prepainted color galvanized coil is mainly used in construction, light industry, automotive, agriculture, animal husbandry and fishery and commercial industries.

Among them, the construction industry, galvanized coils are mainly used in the manufacture of anti-corrosion industrial and civil building roofing panels, roof grilles, etc.;

The light industry uses hot sale prepainted galvanized steel coils to manufacture appliance casings, civilian chimneys, kitchen utensils, etc., and the automotive industry is mainly used to manufacture corrosion-resistant parts for cars;

Agriculture, animal husbandry and fishery mainly use galvanized coils for grain storage and transportation, frozen processing tools for meat and aquatic products, etc.; commercial use is mainly used as storage, transportation and packaging equipment for materials.

The low price grinding disc is suitable for surface grinding, cylindrical grinding, internal grinding, and cutting of various materials. For example: cemented carbide, ceramic, tungsten steel, glass, precious stones, etc.

Its structure generally consists of three parts: working layer, matrix and transition layer.

1. The working layer, also known as the diamond layer, consists of abrasives, binders and fillers and is the working part of the grinding wheel.

2. The transition layer, also known as the non-diamond layer, consists of a binder, a metal powder and a filler, and is a portion that firmly bonds the diamond layer to the substrate.

3. The base body is used to support the abrasive layer and is firmly clamped on the spindle of the grinding machine by a flange when in use. Generally, metal bond products are selected from steel and alloy steel powder as a matrix.

The problems that should be paid attention to when using 4.5 inches grinding wheel.

1. Grinding wheel should be inspected before installing the fan to see if there is any crack, and use a wooden hammer to strike the grinding wheel to hear if there is abnormal sound. If there is, the cooling fan can not be used, so as to avoid the damage caused by the grinding wheel.

2. For new or alternate use of resin 4.5 inches grinding wheel, it should be idle for more than one minute before use. If everything is normal, it can be used according to the safety regulations of grinding machinery.

3. Since the resin grinding wheel is brittle and fragile, please do not let it be impacted, collided, or fall. Store it with anti-freeze and moisture-proof. Keep the room cool and ventilated, place it flat, stack it neatly, pay attention to dust proof, keep the unused grinding wheel clean, and do not press it.

4. When installing the grinding wheel, the center of the resin 4.5 inches grinding wheel must be found. At the same time, the flange should be fastened. After installing the flange, the outer circle of the grinding wheel should be checked whether it is concentric with the main shaft. The resin grinding wheel has at least one side perpendicular to the center line of the main shaft.

5. After installing the grinding wheel, for safety reasons, please do not install the qualified protective cover before starting the machine.

There are two problems in the fast working grinding wheel grinding:

• The fast working grinding wheel quality: Mainly the grinding wheel must have good self-sufficiency and shape retention, and the two are often contradictory. 
• Grinding wheel dressing technology: that is, efficient and economical to obtain the required wheel profile and sharpness. Therefore, in order to improve the efficiency and precision of grinding, especially for the efficient finishing of difficult-to-machine materials, CBN grinding wheels are used for efficient and powerful grinding, which makes the powerful grinding break the limitation of traditional grinding, and the productivity is doubled. It does not need to be roughed and can be directly ground into finished products, which not only improves the processing efficiency, but also improves the processing quality. Such as SG abrasives.

In the grinding process, the correct choice of the fast working grinding wheel plays a decisive role in the efficiency of the machining.

Shandong HENGZE New Material Co., Ltd. is a China galvanized steel coil supplier, provides hot sale galvanized steel coil and hot dip galvanized steel coil factory price. Let’s talk about what galvanized coil materials are.

a. Hot dip galvanized steel coil. A thin steel coil is immersed in a molten zinc bath to adhere a thin layer of zinc to the surface. At present, it is mainly produced by a continuous galvanizing process, that is, a coiled steel plate is continuously immersed in a plating tank in which zinc is melted to form a galvanized steel coil;

b. Alloyed galvanized steel coils. This steel coil is also produced by hot dip, but immediately after it is discharged, it is heated to about 500°C to form an alloy coating of zinc and iron. This galvanized coil has good adhesion and weldability of the coating;

c. Electrogalvanized steel coils. The production of such a galvanized steel coil by electroplating has good processability. However, the coating is thinner and the corrosion resistance is not as good as the hot dip galvanized coil;

d. Single-sided plating and double-sided differential galvanized steel coils. Single-sided galvanized steel coil, that is, a product that is only galvanized on one side. It has better adaptability than double-sided galvanized coils in welding, painting, anti-rust treatment, processing, etc. In order to overcome the shortcomings of uncoated zinc on one side, there is a galvanized coil coated with a thin layer of zinc on the other side, that is, a double-sided differential galvanized coil;

e. Alloy, composite galvanized steel coil. It is a steel coil made of zinc and other metals such as lead and zinc, or even composite plating. This steel coil has both excellent rust resistance and good coating properties. In addition to the above five types, there are also colored galvanized steel coils, printed galvanized steel coils, and polyvinyl chloride laminated galvanized steel coils. However, the most commonly used one is still hot dip galvanized coil. Galvanized steel coils can be further divided into galvanized steel coils for general use, roofing, building exterior panels, structural, tiled slabs, tensile and deep drawing.

China color-coated corrugated roofing sheets are usually classified according to application location, wave height of plate type, lap joint structure, and material. Common classification methods are as follows:

Classification by application location -- roof panel, wall panel, floor slab and ceiling panel, etc. The use of China color-coated corrugated roofing sheet at the same time as the wall decoration plate, the architectural decoration effect is relatively new and unique.

According to wave height classification, it is divided into high wave plate (wave height = 70mm), a medium wave plate (wave height <70mm) and low wave plate (wave height <30mm).

According to the classification of substrate material -- divided into hot-dip galvanized substrate, hot-dip aluminum zinc plating, and hot-dip aluminum substrate.

It is classified according to China color-coated corrugated roofing sheet seam structure -- divided into lap joint, undercut and compression structure, etc. The middle and high wave plate should be used as the roof plate with higher waterproof requirements. Overlapping middle and high wave plate galvanized sheet to use floorboard; Lapped low wave plate should be used as a wall panel.

The fast cheap metal grinding disc works mainly for grinding. The grinding disc is divided into many different types according to different classification methods. The resin grinding disc is one of them. The resin grinding disc is a grinding disc processed by a bonding agent. The effect of different grinding discs is different. The grinding disc should also be operated according to the corresponding operation method to ensure the working quality and efficiency of the fast cheap metal grinding disc. On the resin grinding disc, we will introduce the problems to be paid attention to during the use. Let's see it!

1. Before using the resin fast cheap metal grinding disc, be sure to check the product for cracks, products and dumb sounds. If it is, it cannot be used.

2. The speed of the grinding disc must not exceed the specified safe working line speed.

3. Do not use the end face grinding disc exclusively. Please do not work with the end face of the grinding disc.

4. Special dressing tools should be used for dressing the grinding disc. Operators must wear protective goggles when trimming.

5. Each piece of resin grinding disc is marked with high use and line speed. Before installing the machine, be sure to confirm the speed of the machine. Do not exceed the speed marked on the fast cheap metal grinding disc to ensure that the machine has perfect protection device, the center hole of the grinding disc and the center axis of the grinding disc. Must match, otherwise it cannot be used.

6. The flanges on both sides of the fast cheap metal grinding disc must have the same shape and size. The flange diameter should meet the requirements, and there should be grooves on both sides.

7. When installing and fixing, be sure to be tight and appropriate. After the installation is completed, start the machine to idle for about one minute. No abnormality can be used.

1. Grinding wheel made in China has high grinding precision and long wear-resisting time. It does not need to be often trimmed. Its precision requirements can fully meet the requirements of precision machining. It can avoid the taper of the workpiece during the machining process. The excellent wear resistance of the high quality 9'' grinding wheel can make the enterprise greatly Saving production costs, no need to stop work frequently to repair the grinding disc, can greatly improve production efficiency and expand production.

2. A variety of bonding agents have ultra-high wear resistance, and the wear of the grinding wheel made in China is extremely small.

3. The mechanical strength of the grinding wheel made in China base can withstand the high cutting force during high-speed grinding. High reliability and high reliability.

4. The high quality 9'' grinding wheel has a sharp appearance, and the abrasive grain has a large protrusion height and can accommodate a large amount of long chips.

Side grinding problem

In the daily use of the grinder, we often find that some operators do not divide the type of grinder, regardless of the type of fast 9” grinding wheel, and use the side of the grinding wheel to grind it arbitrarily. This is a serious violation of the safety operation rules. behavior. According to the regulations, the grinding wheel with the circumferential surface as the working surface should not be grounded. The radial strength of the grinding wheel made in China is large and the axial strength is very small. When the operator is too strong, the grinding wheel will be broken and even hurt. In practice This behavior should be prohibited during use.

Positive operation problem

In daily use, many operators are always accustomed to working on the grinding wheel made in China because the direction can be used. In fact, this behavior is a special prohibition in the operation of the grinder. According to the operating procedure, when grinding the workpiece with a grinder, the operator should stand on the side of the fast 9” grinding wheel and must not operate on the front side of the grinding wheel to avoid the grinding wheel flying out or the grinding wheel breaking out and injuring people when the grinding wheel fails.

Hard operation problem

In the use of grinders, some operators, especially younger operators, are trying to grind quickly and use too much force, which is a very unsafe operation. The flatness of any grinding wheel made in China has a certain strength, which is likely to cause the fast 9” grinding wheel to break, or even fly out and hurt people, it is also a behavior that should be prohibited.

Can a machine be installed with a variety of sizes of grinding discs? Such as 180*6*22mm metal grinding disc.

The description of the speed of the work of cutting machine grinding disc is often caused by the cutting table to describe the work faster than 5.5KW, the speed of 2800 rev / min, cut off the workpiece diameter.

The reason is that the torque is large when the cutting is performed, and the damage of the grinding wheel of the cemented carbide is also relatively large, so it is suggested that the grinding disc should have a certain rigidity, and we often use the 180*6*22mm metal grinding disc with a thickness of 3.8 mm.

At the same time, due to the large diameter of the cutting, the resistance of the grinding disc will also increase, and the temperature of the new surface will be high, so it will be very important to lower the cutting temperature. Conditions like this, the temperature of the added water should be reduced when cutting.