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Hot Rolling And Induction Bending Steel - Pros And Cons

Let’s talk about hot rolling.

We should begin be defining four important terms:

- Hot rolling
- Cold rolling
- Induction bending
- Induction coils

HOT ROLLING: Hot rolling is the process of heating a large tract of steel (rarely any other type of metal) and using weighted rollers to shape the metal, typically to make it thinner. The heat is fairly substantial, between 800 and 2,200 degrees Fahrenheit. The rollers are calibrated to place just the right amount of pressure on the steel to meet the thickness and other specifications of the client.

COLD ROLLING: Cold rolling differs from hot rolling, primarily because it doesn’t use heat. Yes, that is obvious. But the heat is needed for bulkier and less-finished material. Cold rolling would more typically be used on sheet metal, steel rods, bars and the like. Cold rolling’s main advantage is that the metal retains its strength more than hot rolling does.

INDUCTION BENDING: Induction bending is a totally different process with a totally different purpose. It is used to bend almost any metal, but typically pipe and tube forms. It is a highly energy-efficient process, because only a small section needs to be heated - just the section that requires a bend. So a long pipe that would typically remain straight, such as a petroleum or natural gas pipelinet, needs to be heated only at those select points that require a bend.

INDUCTION COILS: These are coils used to heat through a process called “induction”. Really they are transformers that convert DC power into very high heat. It consists of two insulated copper wires coiled around an iron core. A vibrating interrupter creates a faster pulse from the low-voltage DC power, creating a higher voltage pulse for more heat. Induction coils are used to heat the tubes and pipes in induction bending.

So the processes are quite different and so are the goals. However, there can be overlap and there are times when a decision must be made between induction bending, hot rolling and cold rolling.

Here are six advantages of induction bending over hot or cold rolling, reasons why a metal rolling company would prefer induction bending over other methods when it is appropriate for the job:

A) Induction bending creates minimal distortion in the tube or pipe, because only a small section of the metal tube or pipe is heated. The rest of the pipe remains untouched and unaffected.

B) Induction bending is more energy-efficient than hot rolling (although not more than cold rolling) because only a small section of the metal tube requires heat. This saves on costs and is better for the environment,

C) Induction bending does not require any sand filling or internal mandrels. This greatly reduces overhead costs of operations (less equipment!).

D) Induction bending is relatively quick, consuming less time, which also keeps labour costs down significantly.

E) Induction bending tends to deliver a higher quality product than cold bending does. Often cold bending can lead to excessive warping and wall thinning. It is important for the steel bending company to know the limits and capabilities of its machines and of the processes involved in each method of bending metal.

F) Induction bending eliminates the need for mechanical or welded joints. What this means for the finished product is that it sports a smoother finish.

It should be noted that these methods of bending and forming metal are not mutually exclusive. For instance, hot rolled steel often ends up as coiled sheet metal. This sheet metal ifs often then fed through the cold rolling steel process, where it becomes thinner sheet metal, metal foil and metal plates.

So it is not always just a choice between induction bending, hot rolling and cold rolling that needs to be made. Sometimes it is a decision of just exactly how to best combine two of the methods for the highest quality result, meeting the specifications of the client while minimizing possible weaknesses and imperfection, all the while keeping costs as low as possible. This is not a simple task.

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What Is Metal Stamping

What is metal stamping?

Metal components can be fabricated in a mass volume by a variety processes such as sand casting, metal die casting, machining etc. One of the more economical and common processes used for making sheet metal parts is by metal stamping.

Metal stamping process, which in general involves taking a flat raw metal sheet, cut and form or bend it into the required shape and size. Product such as Mounting brackets, casing, electronic connectors for instance. metal stamping process is the most cost-effective process that permits metal parts to be manufactured at a high production rates. Production speed can be ranging from 40 to 2000 parts per minute.

In a metal stamping process, a sheet of metal stock material in fixed thickness and width is introduced into a stamping press. The stamping press can be either a mechanical or hydraulically driven depend of it process requirement. A stamping tool in two half are mounted on the press machine, the upper part of the tool is so call punch and the lower part is called die. The punch and die will be moving up and down with the press machine ram to cut and form the stock material into the final shape and size.

Press machine can be as small as 10 tons and as large as 800 tons. The mechanical driven press are usually run in a faster speed than the hydraulically driven. The Hydraulic press usually provides heavier tonnage than a mechanical one.

In general, The sheet metal has been cut to the required shape and size by a blanking tool and subsequently transfer to other presses and tools to perform the secondary process such as piercing, forming or bending, the process will be repeated under the final form is achieved.

The whole operation is done by manually loading and unloading, in some cases, robot transfer arms are installed in the production line to replace all manual work, all metal parts are transfer by robot. The tool designed in such, we called it a transfer tool.
Because the single transfer process requires frequent changing of tooling or press machine, it is usually not economical to runs large volume production batch. A progressive tool is introduced to runs the complex component within one single stamping tool and press.
A progressive tool consists of all the operations within a tool, imagine, all single stamping tools are to align in a fix distance within the tool. Each tool is called a station. Raw material in coil form will than introduced into the tool by either a mechanical or electronic control feeder to feed sheet metal in the tool.

The different between a transfer tool and a progressive tool is usually the transfer tools are larger in size, it may requires a few press machines at one time. As for the progressive tool, tooling is smaller in size and runs on only one press machine.

Two location pins in each station locate the metal part precisely to ensure the accuracy of the stamped parts in a progressive tool. The location pin we called it a Pilot pin.

Progressive tool is commonly used in the metal stamping industries.

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Everything You Might Want To Know About Cold Rolling Steel And Copper

Cold rolling is one of engineering’s more interesting accomplishments - a way to literally change the very properties of metal so as to better accommodate the types of structures we can build. This applies to buildings, to bridges, to air and marine infrastructure and other metal-based structures.

Cold rolling changes the properties of metal in three ways:

- It reduces the size and thickness of a metal.
- It increases the strength of the metal, for better weight-bearing capability.
- It makes the metal harder.
- It makes the metal less flexible and more prone to cracking

The process begins with a simple piece of metal, perhaps steel or copper or even aluminum or tin. This might typically be a steel bar, a steel plate or just sheet metal. Note that the sheet or bar is typically at room temperature (”cold” rolling does not imply any manoeuvre involving penguins or walruses).

The metal piece is passed through at least two rollers (why it is called “rolling”) that are calibrated for a controlled weight. The rollers’ job is to decrease the thickness of the metal sheet or bar, simultaneously increasing both its hardness and its strength. The trade -off - and there are almost always trade-offs in life - is that the cold-rolled steel or copper has less ductility than the original metal. This means the engineers have to be more careful how they use the piece, as it will be more less flexible and prone to cracking and fractures.

Interestingly, there are more than one cold rolling process. Here are four different cold rolling processes, each one serving a unique purpose:

>> Quarter Hard Cold Rolling

This is the process to use if you will want to bend or curve the metal later on. A sheet using the quarter hard process can be bent or rolled on to itself without a risk of fracturing.

>> Half Hard Cold Rolling

Metal cold rolled with the Half Hard process can be bent only to 90 degrees, which is still a faire amount.

>> Full Hard Cold Rolling

Cold rolled metal with the Full Hard process can only be bent to 45 degrees. This is the least flexible process, but is perfectly fine for most purposes.

The three cold rolling process we have just seen, Quarter Hard, Half Hard and Full Hard, can reduce the size of a piece of metal by up to 50 percent, increasing both the strength and hardness of the metal, but also reducing its ductility.

>> Skin-rolling Cold Rolling

Skin-rolling is used to reduce the thickness of a metal by just 0.5 to 1 percent. This process creates a smooth metal sheet that is significantly ductile than the other three procedures, and is preferable in a situation where there might be a fear of cracking or fracturing.

Cold rolled metal is normally made into sheet metal, foil metal, and plate metal. These pieces are typically smaller than the same (all other things being equal) metal created through hot rolling. Metal produced through cold rolling will be used in varying different types of applications, from industrial products such as steel ducts, tubes and pipes work to consumer products such as aluminum cans.

Cold rolling and hot rolling (otherwise known as induction bending) are very different creatures. In cold rolling the metal remains at room temperature; in hot rolling the metal is - you guessed it - heated to a very high temperature.

This information was provided by Paramount Roll and Forming, a leading steel rolling company in southern California. They have been rolling steel pipe, tubes, beams, sheets, angles, plates and more since 1963, and obviously have done a lot of both hot and cold rolling.

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Widely Utilised Stainless Steel Grades

Stainless Steel grades are fundamentally alloys of iron with more than 10.5% chromium. These alloys may contain extra elements of nickel, manganese, carbon, nitrogen and silicon. They can further be restricted for special purposes by addition of molybdenum, titanium, niobium, silicon, sulphur etc. A deep variety of these alloys have been meliorated based on special requirements. These are categorised into following categories based on their micro structure:

Ferritic Stainless Steel
Ferritic Stainless Steel alloys are non-hardenable simple chromium grades with chromium content ranging from 10.5% to 28% and with low carbon quantity. These are magnetic and display a finer resistance to corrosion than martensitic alloys. These grades are used utilized in applications where the wanted formability, weldability and corrosion resistance is between those of martensitic and austenitic types. The ferritics can be polished or buffed to achieve high lustre.

Martensitic Stainless Steel
Martensitic Stainless Steel alloys are literal chromium grades incorporating 11.5 % to 18% of chromium with comparatively high carbon content (0.1% ? 1.2%). Initially ameliorated for cutlery, these are well suited for applications involving high hardness and resistance to abrasion and erosion. These alloys are magnetic and exhibit fair cold forming characteristics. Although these can be hardened by air-cooling, oil quenching is sometimes used to guarantee homogeneous hardening. These alloys can be welded but require stress relieving after welding. They present their best corrosion resistance in the hardened condition and execute well in mildly corrosive conditions. Martensitic Stainless Steel alloys are ordinarily utilized for knife blades, turbine blades, surgical instruments, fasteners, shafts, spindles, valves and pins.

Shanti Foils Private Limited deals in the manufacturing and trading of all types of stainless steel flat, rods, wires, sheets (patta and patti), sheet cuttings, blanks, circles, hot rolled and cold rolled coils, utensils, kitchenware, cutlery and scrap (HMS - I, HMS - II, Aluminium, and copper). For more information, detailed specifications, sale and purchase of these items, visit the site: stainless steel alloys

Austenitic Stainless Steel
Austenitic Stainless Steel grades are distinguished by brilliant corrosion and oxidation resistance, weldability, ductility and toughness compared to ferritic and martensitic Stainless Steel alloys for similar levels of chromium. Austenitic Stainless Steel grades present prize resistance to atmospheric corrosion. They effectively resist attack of organic acids (e.g. acetic, lactic, citric etc.), display good resistance to oxidizing acids (e.g. nitric acid) and fair resistance to mineral acids (e.g. sulfuric acid). These grades are well suited for severe forming. Some alloys are work harden to a high degree while others have been developed to minimize this tendency. Work hardening is advantageous in certain cases where high strength is required. Austenitic Stainless Steel grades are non-magnetic in annealed condition but relying on composition, they may become mildly magnetic when cold worked. These Stainless Steel grades present good high temperature properties such as creep strength and resistance to oxidation or scaling. They also display fantabulous low temperature ductility and impact strength. Austenitic Stainless Steel grades can be readily fabricated by bending, drawing, spinning, punching, drilling, machining and welding and can be promptly polished to a high finish. These attributes make them very versatile and popular for diverse applications in a variety of industries. There are two broad categories of Austenitic Stainless Steel ? chrome-nickel (300 Series) and chrome-manganese (200 Series). Currently, chrome-nickel is the largest produced Stainless Steel category globally. Typical applications for this category include food processing, chemical plants, pharmaceutical equipment, hospitals, textile, architectural, building construction, kitchenware, consumer durables etc. Chrome-manganese Stainless Steel is the fastest growing of all Stainless Steel categories on account of its high performance to cost ratio. Its applications include kitchenware, cutlery, sinks, automotive trim, architectural, buildings, furniture, buses, trains and ornamental tubes.

Duplex Stainless Steel
Duplex Stainless Steel grades comprise of comparatively high chromium (between 18% and 28%) and reasonable amounts of nickel (1% to 8%). This mixing of ferritic and austenitic structures is called duplex. Many of these alloys contain molybdenum (1% to 5%) and nitrogen (0.05% to 0.3%). Quite a few duplex Stainless Steel alloys also incorporate manganese (up to 5%), copper (up to 2%) and tungsten (up to 2%). These alloys show high resistance to stress corrosion cracking and chloride ion attack and have healthier yield strength than that of austenitic or ferritic steel alloys. These properties mixed with suitable design lead to material saving. High quality fabrication and welding are possible if the operator is trained well. These alloys are utilized in marine applications, offshore platforms, paper and pulp industry, chemical, petrochemical and desalination plants.

Shanti Foils Private Limited deals in the manufacturing and trading of all types of stainless steel flat, rods, wires, sheets (patta and patti), sheet cuttings, blanks, circles, hot rolled and cold rolled coils, utensils, kitchenware, cutlery and scrap (HMS - I, HMS - II, Aluminium, and copper). For more information, detailed specifications, sale and purchase of these items, visit the site: classification of stainless steel

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ERP Selection Suggestions For Industries Meeting ISO 9000 ISO 9001 2008 Requirements

Companies implementing ISO 9001 face huge challenge in keeping their records.

On one hand they have to keep records as per regulatory and statutory requirements and also as per customer requirements.

Many times many customers demand things such as test certificate, analysis report etc. in a specific format. It becomes difficult to organizations to prepare records in separate format and and keep an additional copy as well.

ERP or Enterprise Resource Planning software are good tools to help keep records in proper database format. The benefit is that you can print the record in any format you like (subject to condition that your ERP has facility to select different formats for printing a specific record).

ERP’s are normally designed taking account as base. I mean only financial matters are given importance or preference when ERP is designed or selected. The quality records relating to production, quality control, maintenance still remain on paper requiring double work for the staff.

So when you select a ERP or design one for your industry, keep in mind the records required by your quality management system (ISO 9000) and eliminate all possible paper based records to electronic records.

There are many solutions but may of these system lack in quality assurance. Product inspection and testing records are still required to be maintained on paper but not with QASoft. This also gives benefit of instant analysis of data and taking preventive action on time.

Consider this, you manufacture one product which requires normally 13 different tests but there are 2 optional tests which are done only when required by the customer. Can your ERP handle such situation?

Consider this, you have a machine which needs periodic maintenance very 15 days, but due to lack of time or load on the machine last time you did after 20 days, will your software alert you as per planned schedule or automatically extend the schedule to 5 days?

Consider this, you have billed a customer in USD, but now he wants to pay in EURO, and you are keeping accounts in INR. Will your system require one voucher entry or more than one?

Consider this, you have issued products (raw material etc) for manufacture as per standard bill of material (BOM) but for some r other reason your manufacturing department needs extra material, will your system give valuation based on standard BOM or actually consumed products?

Again will your ERP give price based on standard price or actual batch used in the manufacture?

These are some of the factors you should consider while selecting an ERP solution for your organization.

About the author:
Manoj Jain is a Management consultant and software architect, who provided consultancy and training to 100’s of companies. He has developed ERP’s meeting requirements of ISO 9000/ ISO 9001 and published e-books, training PowerPoint (ppt) kits, document manual sets, and auditor examination software which is used by even certification bodies apart from over 1000 companies. He has authored Do It Yourself ISO 9000 ISO 9001 2008 eBook Training PowerPoint ppt Document Manuals and Exam Software

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Shipping Container Sizes - Things You Should Know

When you buy or hire shipping containers generally you do so by size. The size you choose is generally to suit what space you have available or how many items you need to store or ship. Most people ask for a 20ft or a 40ft container as these are the most often to be had. Why is that? In fact the shipping industry was responsible for determining shipping container sizes. For what you probably don?t realise as you choose the size you want is that the usual sizes of shipping container ? either 20ft or 40ft long by 8ft wide and 8ft 6in tall ? revolutionised the cost of shipping.

For these standard sizes meant that the loading and unloading of shipping containers could be mechanised meaning that only a few pieces of equipment are needed to move the containers rather than the considerable manpower and different types of machinery that had been considered necessary to move the varying shapes of palletised goods that had up until then been the norm. It also meant that large numbers of storage containers could be organized on a single ship as they are easily arranged in large stacks.

Of course the standard 20ft and 40ft are not the only sizes of steel containers available. As such items such as cars, food, clothes etc were shipped inside the containers from all over the world at considerably reduced prices than had previously been available.

There are 20ft and 40ft high cube iso containers available which are 9ft 6in tall and are particularly of use for putting taller machinery and equipment in. Smaller sizes of shipping container are also used - such as the 8ft and 10ft long containers although these often have to be shipped as ?special cargo? rather than going on the main container decks.

But nowadays, shipping containers are not just used for shipping. They are regularly used for secure, dry storage. As such, shipping container sizes can be altered to any length from 40ft downwards. A popular size is the 30ft container for example, but people will often ask for a 16ft of 18ft if that is all the room that they have. Mind you, it is essential when working out the container for you to take into consideration that an extra 4ft will be required if the doors to the container are to be opened fully.
So how do you know what size of shipping container to choose. It is difficult to picture what volume of goods a 20ft shipping container could hold. It is useful to compare a 20ft container to a single garage and a 40ft to a double garage from a point of view of storage.

Indeed you can fit most models of car into a 20ft shipping container, although the 8ft width does make it difficult to get out, and the car has to either be pushed in the last few feet or the driver has to escape out of the window!

Often, people ask for an 8ft or 10ft container believing that it will be cost less than the 20ft. Yet because a 10ft or and 8ft is usually altered from a 20ft container, the additional work means that the 10ft or 8ft is as ? if not more ? expensive than the standard 20ft size. So, if you have space for the larger size, it is often worth buying as you get more storage space for a similar amount of money.
Next time you are choosing what size of storage container to buy or hire, think about a 20ft or a 40ft if you are on a budget, and remember that if space is an issue to allow enough room to open the 4ft container door!

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Finishing Parts Become Easy With Tumbling Media And Compounds

Tumbling media are materials that are used in the finishing process. They are loaded with parts to be finished into finishing machines, with or without tumbling compounds. They help in cleaning, smoothing and deburring of parts. Tumbling media can be man made or natural. Man made media include plastic media, synthetic media and ceramic media which come in preformed shapes. Natural media include walnut shell media and corn cob media. Tumbling media are used in finishing machines like tumbling barrels, vibratory machines and centrifugal machines.

Plastic media are otherwise known as tumbling stones. They come in shapes like cones, pyramids and triangles and have varying abrasive properties. They create smooth but dull finishes on surfaces and because of their light weight are suited for use on parts that might get damaged easily. They are safe on threaded parts and can be used on parts as a pre cursor to anodizing. The cone shaped plastic media act well on parts with holes and triangle shape acts well on edges and flat surfaces. Multiple shapes can be used on parts with complex designs.

Ceramic tumbling media are made of silica, minerals and abrasives mixed in different proportions and processed at high temperatures to produce hardened shapes. They are good for aggressive finishing needs and work well with hard metal parts. They suit usage with heavy loads that cannot be handled by plastics; they also come in smaller sizes and hence are suited for smaller parts. Synthetic tumbling media also come in different shapes; they weigh lesser compared to ceramic media. They are cost effective and are good to provide ultra smooth finishes. Compared to plastic media, they take more wear and tear and residue left from processing is lesser. They are ideal for use in high energy machines like centrifugal barrels.

Tumbling compounds are chemicals used to increase the effectiveness of media by ensuring that glaze is not formed on the parts during the finishing process. They act as abrasive agents and help in maintaining a nice color to the metal parts. They impart anti rust and anti corrosion properties to the parts when the right agents are added to them; they are effective cleaning agents and help in deburring by suspending debris and preventing them from getting re-deposited on the parts. The compounds are either alkaline or acidic in nature depending on the media they are used with.

The flow rate of the tumbling compounds should be matched with the volume of media being used for a good finish. Tumbling compounds are known to help in degreasing, descaling and removing grime. They help in lubrication of parts to protect them. They help in grinding, polishing and brightening of surfaces. They help to finish delicate parts by providing a cushioning effect and preventing damage to the parts. Acidic tumbling compounds enhance cutting speeds and bleaching efficiency. When used in proper combination with finishing media, tumbling compounds help to reduce cycle times substantially.

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