During the construction or repair work is often necessary to bend the pipe.Sometimes this procedure is a must when installing or repairing the water supply system, underfloor heating or water heating systems.Of course, you can buy already bent piece of pipe, but the price of aluminum tubes that have curved high, and therefore it is necessary to bend the work yourself.
- concept of bending pipes
- Basics of folding
- tools for bending pipes
- methods folding aluminum tube bending
- Bending rolling
- Bending rolling
- Bending pressure
- Bendingaluminum pipe at home
- Recommendations for bending process
concept bending pipes
How are bending aluminum tube?At your home or at the cottage may be still on hand tube bender - a special tool through which you can make the necessary pipe shape.If such a tool is not available, you have to find other methods that are also used in the home.But let's deal with the basics of bending m
Today, metal constructions of bent pipes are widely used in the construction industry.Bending allows to obtain the desired product shape and dimensions required.The procedure is a thin-walled pipe bending lines at a certain angle and is accomplished by internal compression and stretching of the outer layers of metal.
outer layers while stretched and elongated, and internal - are compressed and shortened.In length it remains unchanged only the neutral layer, which lies at the center of symmetric products, at equal distance from all sides, while the single-ended products - runs through the center of gravity.
If bent pipe welding is not applicable and other methods of compounds which act directly on the metal structure, without reducing the durability and strength of the product.Production of metal constructions of bent pipes to reduce the number of cast members, and threaded connections.Bent shape allows water, gas and other substances through the pipes to pass easily.In addition, turn provide a more reliable seal pipes, the most positive impact on the life of the product.
Pipe bending is a very complicated process, because the metal is deformed when bent.However, if the wrong bend metal, there may be many microcracks because of what metal are much less robust and reliable.Use in the construction of curved elements is very important, because the procedure allows to produce flexible pipes rigid metal structure, which are distinguished by high ergonomics and attractive appearance.
bending method can obtain reliable and quality gutters, fence sections, skates roofs, rails, taps and decorative elements, which are used in the construction of a wide variety of objects.Manual pipe bending is produced in the hot and cold with the help of special tools.To prevent the formation of folds in the bends and ovality of cross section, the procedure is carried out using fillers, oils, fine dry sand and other easily removable materials.
tubes that have a diameter of 20 millimeters, bent cold on manual pipe bender, which is attached to the bench with the help of the plate and the hub.Located on the axis of the hub fixed roller with a collar, which is fixed in the bracket with the handle.The pipe, which is subject to bending, decided to insert between the two rollers in such a way that the collar entered its end.Then turn the handle bracket around a stationary roller-template until the desired angle not flex pipe.
flexible tube in the hot state is usually applied to pipes which have a diameter greater than 100 millimeters.When bending tubes pre-filled product is annealed, mark, one end is stoppered.Then, fill the tube fine dry sand that sifted through a sieve with a mesh of about 2 millimeters, compacting it by tapping on the product.When heating a small sand and sintered to the walls of the pipe burns.Compacted sand filling pipe, the second end of the tube clog wooden stopper, which has gas outlet openings which are formed by heating the sand inside the pipe.
Pipe made a blowtorch to heat or using a gas flame until a cherry-red color.Overtemperature tube was cooled to the same color.Bending recommended with a heating because metal reheat degrades its quality.We can not allow the emergence of overheating of individual sections of pipe.
Basics of folding
Bent called a segment that has one or more bent elbows.Bending in one plane has the following species - ducks, rolls, bends and staples.Retraction is part which is bent at an angle of 45, 60, 90 and 135 degrees.She was often involve pipeline at turns.Here it is necessary to know that the larger the radius of curvature of the discharge, the smoother will be the withdrawal itself.
detail that has two bent portion at an angle of 135 degrees, called a duck.The indentation in the building called the flight.Such details are commonly used when a part that is attached to a pipeline is not on the same surface of the pipe.Also, the duck is useful when traversing obstacles.
bracket - this item is endowed with three bent parts.Typically, the central angle is 90 degrees, and 135 degrees extreme.This item usually employ in going the other pipe.
item that has the correct form of a semicircle, called Kalach.It can replace the two off.Also loaf is often used to connect two heating devices, which are located one above the other in the liner to devices.
Each pipe has a convex outer surface and thus bending the metal may be stretched and flat out of the pipe wall.Consider also that the concave part of a bend metal is compressed.The most unreliable part of the pipe is seam, so it should be placed in a layer between the convex and concave external surface of the pipe lines.
is understood that the plane that passes through the axis of the pipe and the seam must be perpendicular to the surface of the bend.Aluminum tubes with a diameter of 15 millimeters and 20 must have a minimum bend radius - not less than twice the external diameter of the pipe, and with a diameter greater than 25 mm - no less than three times the outside diameter.
tools for bending pipes
to choose the right device for bending pipes, you need to have some understanding of the process of folding and its problem areas.You should also take into account the specific challenges that must handle the equipment.
When processing all kinds of pipes professionals are often faced with difficulties, such as scratches or other defects on the surface, with tears or stretching thin walls of the pipe, with the flattening of circular cross section, as well as the occurrence of sink marks or corrugated sections inside.In order to avoid the formation of defects, it is necessary to choose the right tool.
In today's world there are many different options for folding and tools with which we are to understand.Normally, pipe bend in a vice, a special pipe nip or other improvised instruments.For bending the aluminum tubes can be used various kinds of benders, special machines or plane-parallel plate.The most commonly used benders, which are very popular in the construction field.
They may have a universal action or specific to a particular type of tubes, which have specific dimensions and matter.As a rule, equipment is purchased directly by determining the diameter of the pipe, the tool could last for a very long time and safely.Today the market is full of various kinds of benders and special machines, so the selection of suitable equipment is relatively simple.
Moreover, you can make your own instrument or to make flexible aluminum pipes without the aid of special equipment.Pipes to classify into three categories - manual, semi-automatic and hydraulic.Each of them has its own principle.Hand benders designed for easy bending of metals, which have a small diameter and wall.
hydraulic machines used for application on an ongoing basis, they are more powerful and reliable.Semi-automatic tube benders can bend even on both sides simultaneously.Such an instrument is endowed with improved reliability and performance, it is often used for tubes with a large diameter and thick walls.
With any method of bending should be remembered that the pipe is measured only after bending.Measuring pipe before bending process called preparatory stage.There are also special tools for cutting, processing pipe endings and the surface, rarely applied perforation, calibration and hydroforming tube.
methods of bending the aluminum tubes
to bend different tubes can be used in many ways, regardless of the cost of aluminum tubes.Basic techniques - a flexible method of pushing, bending by rolling, bending and bending by running pressure.This can be used on different equipment.
Bending Bending is activated by pushing for the gentle folds, such as arches, arches, etc.Such a method is endowed with the restriction on the minimum radius of curvature obtained, which must be equal to five or six times the pipe diameter, is pushed between the rollers, one of which performs a diverging function.
By location deflection rollers can determine the outcome of the curvature of the curved portion.Bending method of pushing is less accurate than other methods, so often there is a need to conduct tests of folds that will determine the mechanical characteristics of the particular metal.Often this method is used for thin-walled pipes with a diameter up to 100 millimeters.
larger pipes are bent by rolling.Most flexible method of propulsion is used for the manufacture of decorative elements, such as handrails, furniture, interior, fences and similar items.Typically, such a method exists as a separate function in the pipe bending machines.
Bending rolling implemented in three roller benders.Bending process is carried out by rolling the blank between three rollers.All rollers are driven and move the workpiece.Position rollers to determine the resulting curvature bending.
This method is even less accurate, but one important advantage - the possibility of multiple rolling, allowing progressively closer to the desired shape of the product.Bending rolling requires certain skills.This approach will be very convenient for bending workpieces, which have a large cross section.
When bending by rolling the tube is rolled around the roller with a fixed diameter by an external impact.To do this, use a roller or moving the travel bar.The pipe must not be fixed anywhere.This method can be used in multiple tube bending machines.
Bending haulage occurs without mandrel.Therefore, with small radii of this approach is usually not used to avoid compression of the tube.As a rule, the minimum bending radius must be equal to or greater than 2.5.Also, the pipe must not have stringent requirements in the field-of-roundness of flexion.
Bending pressure involves the use of the press with stamps definite shape.In this case, the tube must take a predetermined shape under the influence of external pressure.But this method is endowed with external constraints that are associated with the high cost of molds and spread the resilient properties of the workpiece.
Bending pressure method used in the case where in addition to bending, the pipe must undergo some other changes, such as a slight flattening.This method is often activated in manual izgibochnyh structures that are curved to a specific radius of a matrix of tubes and drive with vertical matrix, which presses her pipe.
Instead of an external force can be used inside, which is carried hydroforming.For this metal should be put into the mold and into the fluid feed under high pressure, which can squeeze the tube to the mold.This method is very accurate, but it has a high price.
Bending aluminum tube at home
Bend the aluminum pipe is not so simple as to produce a compound of aluminum tubes, but it is quite possible to do.There are many techniques for bending metal pipes.When the process of bending the copper pipe should first fill with sand to prevent cracks and other irregular deformation.Due to sand, even in folding station stored round sectional shape.But copper is hard metal, aluminum, but much softer.
- folding aluminum tube you can use a gas burner.But note that for galvanized pipes, this approach should not be applied.The work begins with a strong fixing pipes, which must be pre-warmed to the point of bending.To test the readiness of the aluminum pipe to buckle, you must bring it to the place of normal heating a sheet of paper.If he began to smoke or ignite, it is a sure sign that the pipe is ready for bending.For steel parts such indicator is the color of the heated metal to become bright red.
- often necessary to bend the square tube with a small cross section.This can enable two legs and a rubber mallet.Supports will serve as the basis for the two ends of the pipe and a rubber mallet we bend pipe.Before this procedure is necessary to fill the tube with sand.In winter, instead of sand, you can use the water that freezes in the cold and play the role of damping frame.The tube is securely sealed with wooden stakes.Shaped tube bends and precisely.To maximize the proper forms inside the pipe bend to a place of good quality spring is placed, which is tied with wire, so that it can be pulled out later.
- Now popular so-called benders, crossbows.They can bend the aluminum pipe, prodavlivaya her in the crook.Automatic benders are the most convenient and easy to use.You simply set the desired angle of bend, put the tube into the tool and reduce the handle.
- But if you do not have my bender, you can use a plane-parallel plate, which has a groove for bending tubes and a special clamp to fix them.In this case, the bending process is very simple.But at such a bending device may be tubes that have a diameter of not more than four centimeters.
- You can also bend the pipe by using a metal plate, which is drilled and the same diameter hole into which you want to insert pins and put them under a certain radius of curvature.This method is suitable for pipes of any diameter and any bend radius.But bending the short tube will require more effort.
- The easiest technique is used, if the metal is not too hard.To the place you want to insert the future fold spring and then bend the pipe at the knee and pull the spring of the longest wire.The spring in this case will hold the pipe wall.
- most popular tool for bending machine is Volnova.With this bender can be carried out in the bending diameter pipes 15, 20 and 25 millimeters.
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