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Wednesday, February 23, 2011

Material Roll Forming

Roll forming machine can roll form virtually any common metal or metal alloy to a customer's specifications. The most common metals we roll form include:

- aluminized types 1 & 2

- aluminum

- cold–rolled CQ (Commercial Quality)

- COR-TEN™

- Galvannealed

- hot-dipped galvanized G-90 through G-285

- hot-rolled P&O (pickled and oiled)

- pre-painted sheet metal, and

- stainless steel

- steel


Tuesday, February 22, 2011

Choice of Metal Roofs

Metal roofing
There are times when the roof is metal and pretty nasty and no one wants to install metal roofing cost. But now times have changed. Will not give anymore. Now, metal roofs are installed by the homeowner proud.

Although the current price of a new metal roof color, shape and texture in the market and with the advantage of having a durable long lasting roof for your home, you can have your stylist, the roof look smart. Speaking in broad metal roofing for homes available in three basic forms. They are available in large sheets and shingles each sheet shingle There are many choices for homeowners when choosing metal roofing for their homes.

Metal Roofing
Metal roofs are generally installed very true in general. They have a large sheet of metal and the size and shape of the roof where they bend and cut a small look at all the factors is missing, a zero But with time, metal roofs are also currently developing and plates are available in various textures and colors to match your home.



Tab roof with wooden models that have been established in the sheet metal yourself. Wood roofing sheets of metal roofing sheets are smaller than the normal. They are usually three or four feet long in addition to the shape of a large number of shingles arranged in a row They are relatively easy to install because the sheets are large and they cover a larger area for installation of one roof.

Choosing metal roofing for your home.
It is difficult to install roof shingles of each metal. Individual shingles must be installed one at a time, and it takes longer to install. It is a labor-intensive task. These shingles are available. But in a wider range of colors, shapes, sizes and textures. And this has led many homeowners think it is worth the cost and trouble, because they lend a special look at home.

Sunday, February 20, 2011

Specifications of a metal roof

Specifications of metal roofing
- Light Weight

- Portability

- Durability. The lowest end metal roofing (thin gauge with acrylic or polyester paints) commonly called AG (agricultural) or Utility panels will last 20–30 years which is roughly 2 times the lifespan of an average asphalt roof. Most metal roofing products today come with warranties from 25 to 50 years. Sheet materials like stainless steel, copper, zinc and aluminum are inherently durable; the oxidization of the base material forms a protective patina. Some modern steel roof sheeting materials are coated with an alloy of zinc and aluminum to give it some of the durability of each of those materials at a lower cost and higher strength than either. Copper and Zinc details have historically been proved to last upwards of 100 years with little or no maintenance. The average life-span of asphalt shingles today (since 2001) is 6–9 years [citation needed], while residential and commercial grade metal roofing usually lasts from 50-100+ years, depending on the type. The coatings and fixings on steel roof sheeting can be designed for different environments including industrial and marine locations.

Metal Roofing
- Metal roofs are often used to cover large buildings because of their high strength to weight ratio. The roof of the new Wembley Stadium is an example. It consists of approximately 40,000 sq ft (3,700 m2) steel sheeting.

- Fire and spark resistant.

- Hail resistant.

- Wind resistant.

- Snow shedding: Painted metal roofs are usually snow-shedding. Snow can usually collect when it is fresh and lighter weight. As soon as the ambient temperature rises a couple degrees, the snow usually just slides off. For this reason metal roofing is ideal for homes in northern or mountain regions.

- Metal is readily recyclable. Aluminum and copper roofing products are available with over 95% recycled content. Most metals can be recycled over and over without losing any valuable properties. Recycling is very efficient. As an example: recycled Aluminum only requires 5% of the energy to produce as does new Aluminum.

- Design flexibility: Some Steel roofing products can be installed over open framing, or on a solid substrate.
- Large sprung curves.
- Rolled bull-nose shapes.

- Energy efficiency. Coatings with high reflectivity like Kynar with "cool roof" pigments commonly save 20-30% on air-conditioning costs due to reflecting away much of the sun's heat. Increases the thermal efficiency of buildings in high temperature areas with its cool-roof paints and high emissivity.

- Labor efficient

- Most metal roofing products require very little or no maintenance.

Sunday, February 13, 2011

Metal Siding

Sheet Metal Siding
There are many metal metal siding style and color. It is associated most often with modern buildings in the industrial and retro. Often use a building wall or corrugated galvanized steel sheet cladding, often with a skin color vinyl cladding of corrugated aluminum is also common that a more durable finish is needed.

The clapboard was made of artificial wood, aluminum. (Aluminum siding), the role usually played by vinyl siding today. Aluminum siding for a living in coastal areas. (With lots of moisture and salt) because aluminum reacts with air in the form of aluminum oxide coating the surface very hard to seal aluminum from further degradation. In contrast, stainless steel model that looks ugly and can decrease the structure of materials and coatings to prevent corrosion of steel such as zinc, sometimes fail around the edges as the previous year. However, the advantages of steel wall resistance - a dent, which is good for areas where severe storms, especially if the area is vulnerable to a hail.




Sheet Metal Siding
Program's first architecture aluminum had taken cover, soil small on the Washington Monument in 1884 steel or stainless steel units siding clapboard has been patented in 1903 and Sears, Roebuck & Company has been offering sympathy steel raised in the form of stone and brick in the catalog of them for many years by the 1930s, Alcoa has begun promoting the use of aluminum in architecture by the 1920s when the manufacturing spandrel panels for decoration. Cathedral of Learning and the Chrysler Building and Empire in New York outside of the AO Smith Corporation building in Milwaukee was covered with aluminum in 1930, and all 3 '- table. wall mounting sheet Duralumin from Alcoa shell out on display was for the architectural league of New York in 1931, most of the architecture of aluminum in the 1930s was in Monument, and it will be six. years before it is used in the construction of housing.

Saturday, February 12, 2011

Why Roll Forming

Roll forming is the process of saving and reproduce very closely agree with the length, width and detail section.

The following are the advantages of roll forming metal parts.
- Roll forming process allows operations such as punching, Bak, and access to the line. Wage labor and time for the two operations will be reduced or eliminated, reducing the cost of one

- Driving a Roll allows a high degree of flexibility. A single tool to roll the length of the almost the same cross-section of any multiple tools for different parts no longer needed.




Roll Forming Machine
- Roll forming can be controlled better than the competition dimension of other metal forming processes.

- Repeating a process that allows the assembly to occur more easily roll into the finished product and reduce the problems due to tolerance "standard" created.

- Roll forming is typically a high-speed process.

- Roll Forming customers with a surface finish better. This will roll forming a good choice for decorative parts, steel, stainless, or for parts to complete, such as anodizing or powder coating addition, surface or design that can be rolled into the surface during forming.

- Roll forming materials more efficiently than the other competition.

- Roll that can happen to develop some form of a wall than the competition process.

Friday, February 11, 2011

Roll Forming

The Process Roll Forming
Roll forming, sometimes spelled rollforming metal sheet metal forming process is a form of progress through a series of bending operations. The process is conducted in line roll forming sheet metal stock is fed through a series of roll stations. Each station has roller, roller means death, where both sides of the plate. Shape and size of the die roll may be unique to the station or like a death roll, many of which may be used in different positions. Wheels death may be the top and bottom sheet with sides, corners and other sheets are forced through the roller die stations, each coil is plastically deforms and bowed station roll each step in the completion of the bending of the plate. forms part of the requirements. Wheels are die lubricant to reduce friction between the die and sheet, which reduces engine wear. In addition, lubricants can allow a higher production rate, which depends on the thickness of roll stations, and the radius of each curve. Roll forming line also includes the performance of other fabricated metal plate before or after roll forming, such as punching or cutting.


The roll forming process can be used to form a sheet into a wide variety of cross-section profiles. An open profile is most common, but a closed tube-like shape can be created as well. Because the final form is achieved through a series of bends, the part does not require a uniform or symmetric cross-section along its length. Roll forming is used to create very long sheet metal parts with typical widths of 1-20 inches and thicknesses of 0.004-0.125 inches. However wider and thicker sheets can be formed, some up to 5 ft. wide and 0.25 inches thick. The roll forming process is capable of producing parts with tolerances as tight as ±0.005 inches. Typical roll formed parts include panels, tracks, shelving, etc. These parts are commonly used in industrial and commercial buildings for roofing, lighting, storage units, and HVAC applications.

Tuesday, February 8, 2011

Sheet Metal Forming - Bending Springback

Bending Springback
When bending a piece of sheet metal, the residual stresses in the material will cause the sheet to springback slightly after the bending operation. Due to this elastic recovery, it is necessary to over-bend the sheet a precise amount to achieve the desired bend radius and bend angle. The final bend radius will be greater than initially formed and the final bend angle will be smaller. The ratio of the final bend angle to the initial bend angle is defined as the springback factor, KS. The amount of springback depends upon several factors, including the material, bending operation, and the initial bend angle and bend radius.

Bending Springback




Bending is typically performed on a machine called a press brake, which can be manually or automatically operated. For this reason, the bending process is sometimes referred to as press brake forming. Press brakes are available in a range of sizes (commonly 20-200 tons) in order to best suit the given application. A press brake contains an upper tool called the punch and a lower tool called the die, between which the sheet metal is located. The sheet is carefully positioned over the die and held in place by the back gauge while the punch lowers and forces the sheet to bend. In an automatic machine, the punch is forced into the sheet under the power of a hydraulic ram. The bend angle achieved is determined by the depth to which the punch forces the sheet into the die. This depth is precisely controlled to achieve the desired bend. Standard tooling is often used for the punch and die, allowing a low initial cost and suitability for low volume production. Custom tooling can be used for specialized bending operations but will add to the cost. The tooling material is chosen based upon the production quantity, sheet metal material, and degree of bending. Naturally, a stronger tool is required to endure larger quantities, harder sheet metal, and severe bending operations. In order of increasing strength, some common tooling materials include hardwood, low carbon steel, tool steel, and carbide steel.

Monday, February 7, 2011

Sheet Metal Forming - Bending

Sheet Metal Bending Results
The action of the bending in both tension and compression in the sheet metal. The outer surface of the plate will be tension and stretch in length, while the experience of compressed and reduced. Core boundary line of the sheet metal with no tension or force of compression present As a result, the length of the core remains constant. The changes in length to the outside and inside surfaces can be related to the original flat length by two parameters, the bend allowance and bend deduction




Sheet Metal Bending Result
- Neutral axis - The location in the sheet that is neither stretched nor compressed, and therefore remains at a constant length.

- K-factor - The location of the neutral axis in the material, calculated as the ratio of the distance of the neutral axis (measured from the inside bend surface) to the material thickness. The K-factor is dependent upon several factors (material, bending operation, bend angle, etc.) and is typically greater than 0.25, but cannot exceed 0.50.

- Bend allowance - The length of the neutral axis between the bend lines, or in other words, the arc length of the bend. The bend allowance added to the flange lengths is equal to the total flat length.

- Bend deduction - Also called the bend compensation, the amount a piece of material has been stretched by bending. The value equals the difference between the mold line lengths and the total flat length.

Sunday, February 6, 2011

Sheet Metal Forming - Bending

Sheet Metal Forming - Bending
Bending metal forming processes are applied to a piece of sheet metal that makes it bend at the corner and forms the shape you want. The bending deformation along the a axis. But the order of execution can do different to create the complex The bend is very small, such as seizure or increased to 20 feet in length, such as a large cabinet or chassis. Bend can be characterized by several different parameters.

Bend line - The straight line on the surface of the sheet, on either side of the bend, that defines the end of the level flange and the start of the bend.

Sheet Metal Forming Bending
Outside mold line - The straight line where the outside surfaces of the two flanges would meet, were they to continue. This line defines the edge of a mold that would bound the bent sheet metal.

Flange length - The length of either of the two flanges, extending from the edge of the sheet to the bend line.

Mold line distance - The distance from either end of the sheet to the outside mold line.

Setback - The distance from either bend line to the outside mold line. Also equal to the difference between the mold line distance and the flange length.

Bend axis - The straight line that defines the center around which the sheet metal is bent.

Bend length - The length of the bend, measured along the bend axis.

Bend radius - The distance from the bend axis to the inside surface of the material, between the bend lines. Sometimes specified as the inside bend radius. The outside bend radius is equal to the inside bend radius plus the sheet thickness.

Bend angle - The angle of the bend, measured between the bent flange and its original position, or as the included angle between perpendicular lines drawn from the bend lines.

Bevel angle - The complimentary angle to the bend angle.

Friday, February 4, 2011

Hot Roll Forming Process

Hot - Roll Forming Process
Hot - Roll Forming process that occurs above Metalworking recrystallization. The temperature of the material. After the grain during processing disfigure them. recrystallize. Equiaxed microstructure, which treat and prevent metal from work hardening. Usually a large piece of metal substrates such as semi-finished products such as cast slabs, blooms, billets, and if these products come from the continuous casting products are often directly in plant foods at the proper roll. In smaller operations starting material at room temperature and must be heated. This is done in the pond water or gas oil used as fuel for its work for large and small pieces of heat induction is used. These materials are able to work the temperature must be checked to ensure that it remains above the temperature recrystallization. To secure the success factor is the temperature above the temperature recrystallization; This is usually 5-10 ° C (122-212 ° F) over temperature. recrystallization. If the temperature drops below this temperature the material must be heated again before it rolled more.




Hot - Roll Forming Process
Hot Roll Forming steel sheet metal in general had little in the way the mechanical properties and deformation of the force that they left. However, in some cases, non-metallic inclusions are giving directions, and some pieces of less than 20 mm (0.79 in) thick, often with some features of a trend. In addition, the cooling is not much wear Yun New forms will cause a residual force, which often occur in the shapes with irregular cross-section such as I - H - beam and the beam, while the finished product quality. Good surface is covered in a mill oxide that forms at high temperatures. It is usually removed or preserved through the process of cleaning the plane, which shows a plane [4] dimensional tolerances are usually 2 to 5% of its overall size.

Thursday, February 3, 2011

Cold Roll Forming Process

Cold roll forming process
Roll forming is a process that continues to employ tools to match rolled flat bar shape the progress of the metal into the desired profile. The process of progress bar called the 'flower' is a gradual change appears on the track as it continues through the various stages of the process.

Cold roll forming of the edge phones than other production methods, as an ongoing process to reduce the production process, the stamping and sub assembly operations - also has the following advantages.

Cold Roll Forming Process




- complex geometric shapes that have produced so much.
- Consistency and accuracy improved.
- flexibility in the thickness and length.
- Added strength due to strain hardening.
- lightweight, strong materials and will save costs.
- Secondary operations can be combined in a continuous operation speed - up production.
- ferrous and non-ferrous metal roll the two will happen.
- Avoid second vinyl coated, galvanized metal or plastic coating around can turn up.
- Added the ability to manage
- The most direct.
- Adoption of more closely.
- better surface finish.

Cold rolled products created, it will find application in various industries and are finding new applications every day. They have changed the way most commonly used for better Some of the products available for roll occurring are as under

Tuesday, February 1, 2011

C-Channel Steel-Roll Forming Machine

C-Channel Steel-Roll Forming Machine with Hydraulic Cutting Device
C-Channel Steel Roll Forming Machine complete with hydrualic cutting and punching hole devices by computer system.

Beside the traditional type single size C-Purlin machine, we also designed 2 new models, double lines & Adjustable C-Purlin machines.



C-Chanel Roll Forming Machine




1. Double lines C-Purlin machine can produce two profiles in one machine as lower picture. It doesn't need to waste time to change cutting moulds or adjust rollers when you want to produce another profile purlin.

2. Adjustable C-Purlin machine can produce 2~4 different webs of C-Purlin in one machine. Customer only need to adjust the roller position by spacers to achieve the purpose that producing different sizes of C-purlin within 2 hrs.

Roll forming machines are driven by chain in hydraulic system. Chain Drive System can save the power compare with other system. That also means that customers do not need to pay the extra power fee during production of steel channel