Keys to choosing plate roll machines

5 Keys To Choosing Plate Roll Machines

Between diminishing factory orders and increasing labor and energy costs, companies that use plate metal in their fabricating processes are finding their profit margins increasingly pinched.
Yet, manufacturers must still invest in new production equipment — whether to replace obsolete equipment or to take advantage of new business opportunities — in order to remain competitive.
Manufacturers must make careful assessments when evaluating the addition of new plate-rolling equipment. Debt capital is still available to purchase new machinery, but paying back the loan will not yield a satisfactory return on investment unless the equipment adds value to the production. Unfortunately, many buyers end up purchasing equipment that lacks the capability and flexibility to meet production volumes and tolerances, simply because they don’t understand all available options and considerations.
In an effort to help manufacturers optimize plate rolling operations, 5 key considerations are offered in order to choose a proper plate bending machine.
1. Factor in the properties of the material to be rolled
Even though drawings call for a plate to be rolled down to the same dimensions, a tougher material will require a much higher-rated rolling machine. In absence of such considerations, defects will result and the manufacturer will end up with excessive scrap.
Today’s steel is much stronger and requires more strength to bend. Thanks to detailed classifications by the American Society of Mechanical Engineers, countless varieties of steel abound: A36, A516 grade 70, Hardox 400/500 series and AR 200/300 series, for example. And these different steels require varying pressures to roll.
A metal’s temper and yield strength must be matched with the customer’s application to correctly determine the specifications of the plate roller. This is especially important since steel characteristics have changed drastically over the past couple of decades. What was once known as mild steel no longer exists.
2. Work with an equipment dealer that is willing to discuss your specific plate-rolling needs
Customers must know the correct questions to ask, in order to get the correct answers. Each manufacturer faces unique challenges, and through systematic querying an astute sales representative can determine exactly what equipment will work best for their process.
Manufacturers must also carefully consider whether they wish to roll conical or parabolic shapes to take advantage of a broader market. Hydraulically operated four-roll machines are ideal for this type of work by eliminating surface scarring, thereby decreasing the need for grinding the lamination (bullnosing) on the minor diameter edge of a cone.
Accurate conical rolling is further achieved through features such as torsion bar parallelism, as opposed to electronic systems or proportional value systems that merely maintain a theoretical balance. Finite parallelism allows the machine to be adjusted to its full conical tilt and back to parallel in only five seconds.
Customers need to discuss issues such as inside diameters, material type, tolerances and the desired shape of the finished product. As an example, some products, such as those found in the pressure vessel industry, demand a maximum of 1 percent out-of-round on their diameters or they are considered defective. By using an underpowered plate roller, too much of a barrel effect can render such a product useless and quickly erase any potential profit margin.
Matching plate-rolling equipment to the specific needs of a manufacturer requires attention to detail. It is imperative that the dealer you work with is willing to sit down with you and discuss the specific needs of your business. There are many issues that need to be addressed, many of which a purchasing manager may not initially foresee.
3. Stay within ideal operating parameters of the machine
It is recommended that manufactures identify what material and what thickness represent their highest volume of work. Then (a company) can deliver a machine that will camber to that specification, thus conserving valuable production hours and eliminating large amounts of scrap.
Quality rolling machines are usually cambered at 50 percent of the full-rated value of the machine. Hence, a 1-inch machine is cambered to roll 1/2-inch plate at a nearly perfect edge. Disregarding this important fact can result in out-of-spec product that the customer will not accept. Problems most commonly arise when rollers attempt to push the upper limits of their plate roll. If 5/8-inch plate is rolled through a 1-inch-rated machine, a small degree of barrel effect will likely occur. This may or may not be an acceptable margin for error. However, when plate thickness approaches the upper end of a machine’s rating, then severe defects can occur. Unless corrected with a shim, it will not be sellable. Conversely, when very thin material is rolled through a machine rated for very thick plate, the finished product may come out tighter in the center than at the ends. Again, time consuming shimming is necessitated to correct for this “hourglass” effect.
4. Carefully consider bending diameters
The tighter the diameter, the more bend pressure required. For instances where thick material must be rolled into tight inside diameters (ID), the diameter of the top roll and the layout of the machine can make the difference between a product whose cylindrical edges meet and one that won’t close.
As a rule of thumb, most machines can roll plate at 1 1/2 times the upper roll diameter. Hence, given a 10-inch-diameter top roll, inside diameters as tight as 15 inches can be obtained. However, new machines that incorporate planetary guides are able to keep approximately 50 percent more area of the plate under bend-pressure during the rolling operation, thereby achieving ratios of 1.1 times the upper roll diameter. This creates a 30 percent advantage on tight diameters.
All machines achieve precise measurements at 50 percent of the full-rated value. Therefore, given a 1.1 roll geometry, a 3/8-inch machine with a 10-inch top roller can consistently roll 3/16-inch plate to 11-inch ID without any barrel defect.
5. Incorporate both side and vertical supports to prevent unwanted bends
Adequate support requires both side and vertical roller-supports, as designed by the manufacturer of the plate-rolling machine. Once employed, plate rolling becomes a one-man job instead of two. This frees up valuable manpower that can be re-routed to other jobs.
When rolling a cylinder, once the inside diameter is more than 200 times greater than the thickness of the material, the weight of the material becomes sufficient to bend the cylinder as it exits the top roll and gets further away from the machine. Without proper support, unwanted radii result. Purchasing a machine with both side and vertical roller supports easily solves this problem.Some manufacturers attempt to skimp on this ancillary equipment by resorting to “makeshift” support such as a forklift or overhead crane. However, this shortcut ties up the use of equipment that can best be utilized elsewhere. Because it cannot adequately support the material, unforeseen bends can still appear.

Handbags women choice or biological destiny

Handbags & Women – Choice or Biological Destiny?

Handbags have been one of the necessities of life for women ever since recorded history began. It was important to have the items that one used often close at hand and articles found in a purse have ranged from ornate sewing scissors (17th century)to todays mandatory cell phone and credit cards.
Why is it that women carry their belongings around and men just have their wallets? My opinion is that the need to carry something to hold goods is a fundamental need rooted in the biology of females. Who is the main caregiver of the family from prehistory to the present? Yes, I know that traditional roles are gradually evolving but what person in the “traditional” family is the most responsible for taking care of everyone? In most cases, it it the woman who gets people organized and make sure everyone has whatever they need.
Biologically speaking, the female of our species takes care of her offspring and makes sure that all needs will be taken care of once the home is left. I believe that this has evolved into women carrying all that they need and what everyone else could possibly want in their handbag. To illustrate – when you go out with a male friend do you ask him for tissues, pen, or paper? No – you ask another female. Another nuturer is more likely to have some basic necessities than a male.
Am I saying that there is a basic “purse carrying” gene? No – what I am saying is that, biologically speaking, females are the caregivers of the world and have always had this role thrust upon them since the beginning of Homo sapiens. It is our destiny (both physically and psychologically) to make sure that the world is in order. We can’t handle the entire planet but we do our best to organize our own particular sphere! Our “caregiving” instincts are attuned to others and, if we fight this destiny, there is a feeling of things not being “quite right” around us. So enjoy carrying your handbag and know that you are making the global community a better place for all!

A beautiful scenery

A Beautiful Scenery

In campus, the boys and the girls are beautiful scenery. They like to imagine, and to daydream. They seem to know everything but they know nothing thoroughly. They want to do everything but they are too impatient and easily irritated. They hope to fly in the sky but fear the dark clouds; and they hope to swim in the ocean, but are afraid of the furious waves.

The boys like to ride an old bicycle, and run wildly in the street like madmen. They wish they could escape from the school and travel all around the world.

The girls like to wear red skirts and tight clothes. They Tag Heuer Carrera Replica admire shoulder-long hair and cool suits; they worship pop stars like Liu Dehua and Zhang Xinzhe and keep their pictures in their diaries as well as in their heart.

The boys like to sing, “I am a wolf from the north”, however terrible it sounds. Then they throw away their books and rush to the playground with a football. The girls like to play with their hair. They plaid, and then take it apart. How can they put their complicated feelings in good order?

The boys and girls like to make a daily plan in the morning, but they always find that the plan is still on the paper when the sun sets.

The boys and girls have tried for hundreds of thousands of times to change those theories and formula which have been obeyed for millions of years on this planet. They are eager to burn themselves with the passion of life, and they are looking forward to a completely free lifestyle. But, they can’t. What they can do is to walk out of the campus and buy some gum. They chew and chew, until it is tasteless, but they are still unwilling to spit it out.

Until one day, the boys and the girls are so tired that they could hardly breathe. They are overburdened with their parents’ warnings and teachers’ expectation. Then they know that there are neither flowers waiting for them, nor a smooth path ahead.

They take off their clothes of dream and imagination that they have worn for a long time. They are no longer obsessed with the fairy world; they Tag Heuer Replica Watches no longer admire romance; they no longer appreciate loneliness; they are no longer sad and depressed; and they no longer look back.

They walk on, leaving deep or shallow footprints in the path of life. They give satisfaction to their parents and surprise to their teachers, but they keep their tears and laughter in their heart. The boys and the girls have grown up.

Merits of organic perfume

Merits Of Organic Perfume

Organic perfumes are natural fragrances that are completely free from chemical constituents and toxic synthetics. The approaching global warming threat is also one of the significant reasons to avoid using artificial oils in perfumes. As a result, perfume manufacturers take keen interest in developing organic perfumes, than enhancing the global warming threat. Organic perfumes are environmentally friendly and have given evidence of being skin friendly. The advantage of using it is that it generates no harmful skin rashes or diseases.
Organic perfumes are found to be excellent as they include primary ingredients as plant extracts containing fragrance compounds and essential oils. Blossoms and flowers, such as jasmine, rose, mimosa tuberose and osmanthus, are also key sources in plants that offer maximum fragrant oils. Leaves and twigs are also appropriate for making organic perfumes and carry merit for the green smell they offer. Fruits are one of the rich sources for manufacturing perfume and are employed for oil extraction, and these include oranges, limes, lemons and grapefruits.
Giving merit to organic perfume is a must and this can be done by showing responsibility by avoiding chemicals found in various products in our daily routine. This is essential to protect the planet from chemical destruction and to save our planet for our future generation. After all, chemical components in fragrances and perfumes have been known to cause headaches, allergic skin reactions, asthma attacks and nausea. Man made synthetic musk scent has even been found in breast milk and human fat.
Producing organic perfume is simple and is also less expensive as the ingredients do not cost much. Subsequently, the merit of organic perfume focuses on being special as they are totally natural and do not include any chemical or alcohol to result in stain clothing. A spectrum of fragrances is available in organic perfume and is usually of better quality than the chemically altered products.
The majority of organic perfumes contain natural nutrients and minerals. However, the trace of vitamins and elements also form a part of organic perfumes such that these rich ingredients produce unique fragrance working with the natural oils in the body. Perfumes with musk or sandalwood fragrance are highly preferred, but because of illegal trafficking, some natural perfume scents are substituted by synthetic aromatics. Conversely, the merit is to organic perfume as the aroma of musk is highly complex and is not simple to imitate using synthetic aromatics. Organic perfumes should have the right compositions such as the scents of rose, cola and jasmine can provide a distinct smell. Some of the popular and well-known perfumes are Eau de cologne, Rose, Opium, and more.
Preserving perfumes is also of great significance as the fragrance changes when light, heat, oxygen and any such extraneous materials get mixed. Tight and light aluminum bottles are ideal to preserve perfumes, but regrettably all the modern day perfumes are available in spray bottles that mix with oxygen outside and dust. The perfumes should also be kept in a cool place and can be also stored in the refrigerator so that the fragrance is retained for a longer period of time.