Stretch Forming Hydraulic Press

What is Stretch Forming Hydraulic Press

Stretch forming is a type of metalworking most commonly used in aerospace applications.During the metal stretch forming process ,metal sheets or extrusions are stretched to exceed their inherent elastic limit and formed around contoured dies to create the desired shape.This stretching results in an increased material yield strength and a stronger finished part.Since stretch forming machines maintain constant tension of the metal throughout the process,they minimize imperfections and wrinkles.

Benefits of Stretch Forming Hydraulic Press

Various profiles can be bent

Almost all sections of aluminum,steel,stainless steel,copper,and other metal profiles and pipes can be bent.After spraying,electrophoresis,electroplating,polishing,wire drawing,etc.,the material can be bent directly without damaging the surface of the material.Profiles with cavities and complex cross sections can be formed at one time.

Good bending quality

When the relative bending radius allows,the inner wall will not be wrinkled and the section will not be distorted.

Bending can effectively eliminate the residual stress inside the material,and the product has good dimensional stability.Due to the cold work hardening of the metal material,the comprehensive mechanical properties of the material can be improved after the material is stretched and bent.

Can bend a variety of curved shapes

In addition to bending traditional standard arcs,it can bend a range of complex curves such as ellipses,parabolas,arcs with straight line segments,conic curves and multi-radius curves.

Strong bending ability

The one time forming degree can reach 12 meters, which can improve the installation efficiency, reduce the installation cost,save materials and improve the quality of the project for projects that require a long arc length.

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High Efficiency Stretch Forming Hydraulic Press

High efficiency stretch forming hydraulic press The stretch forming hydraulic press adopts computer optimized structural design and has a frame structure, which is simple, economical and practical,

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Fish Medicine Forming Hydraulic Press

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Bait Briquetting Machine

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315 Tons Powder Molding Hydraulic Press

When it comes to powder molding, precision and efficiency are two of the most important factors to consider. The 315 Tons Powder Molding Hydraulic Press is designed to deliver both, while also

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Material of Stretch Forming Hydraulic Press

Assembly hydraulic presses

Fastening two or more parts together with a hydraulic assembly press.Straining material,usually flat sheet or strip metal,by moving it around a straight axis and applying stress.The bend is permanently set after removal of the applied stress.

Coining

Highly compressing all surfaces of a workpiece within a closed die system.An object produced by the compression of powdered material,typically done with a custom hydraulic compaction press.An assembly technique that uses a custom assembly press and appropriate tool to fold and flatten material so that two pieces are securely fastened together by pinching action.

Embossing molding

A process using a custom hydraulic press that creates imprinted designs in sheet material by means of male and female dies,theoretically with no change in metal thickness.Converting a flat sheet metal workpiece into a 3D part.Cutting or punching an opening,As a hole in sheet material,plate or various parts with a hydraulic C-frame floor press.

straighten and trim

Bending,twisting,or stretching to correct any deviation from straightness in bars,tubes,or similar long parts or shapes.Typically,a secondary cutting or shearing operation on a previously formed,drawn or forged part.The goal is to trim any surplus metal off the edges,bringing the part to the desired shape and size.

Working Principle Stretch Forming Hydraulic Press

If a part were to be curved without first being stretched,two natural forces would occur during the process.First, one half of the part would naturally be stretched.Secondly,the other half would go into compression,and the neutral axis would be the division between the two. Stretching the material compensates for the compression that would normally take place on the inner surface of the part,which,in turn,eliminates the wrinkling or twist.It could be said that a stretch forming machine bends parts into curved shapes,but does so while pulling the wrinkles out of the part before they can occur.

In this combination,of bending and stretching,the outer fibers of the part being formed experience an elongation stretch sufficient enough to put this fiber into yield i.e.it has been stretched beyond its ability to return to its original length after the stretching force has been relaxed.Therefore,the parts remain close to the shape of the form block after it’s been removed from the stretch forming machine.

Application of Stretch Forming Hydraulic Press

For powder compacting

In powder compacting,a hydraulic press compresses powdered materials into various designs and shapes.

For concrete compression testing

Concrete manufacturers test the tensile strength of their materials using hydraulic presses.

For scrap baling

Scrap baling equipment is used for crushing metal objects such as cars and machines for easy transport,processing,and storage.

For ceramics manufacturing

Hydraulic presses operating at room temperature are replacing high-temperature kiln production methods for tiles, bricks and other items.

Components of Stretch Forming Hydraulic Press

Hydraulic Pump

The centre of the hydraulic system is the hydraulic pump.By generating a flow of pressurized hydraulic fluid,it transforms mechanical energy into hydraulic energy.In press machines,gear,vane,and piston pumps are standard hydraulic pumps.

Hydraulic Fluid

The medium for power transmission inside the hydraulic system is fluid,which is frequently oil-based.It performs functions for lubrication,cooling,sealing,and transferring force.The qualities and factors will be examined to choose the correct hydraulic fluid and get the best system performance.

Hydraulic Cylinder

The hydraulic cylinder is a crucial part that transforms hydraulic energy into mechanical force.The device comprises a rod,a piston,and a cylindrical barrel.We will go through the operation of hydraulic cylinders and how they assist in creating the required force for pressing operations.

Control valves

The flow and pressure of hydraulic fluid within the system must be controlled via control valves.Depending on the necessary movement and force,they send the fluid to various parts,including the cylinder.We will discuss the several categories of control valves frequently found in hydraulic press machines,such as directional control valves,pressure relief valves,and flow control valves.

How to maintain Stretch Forming Hydraulic Press

Look for oil leak on all hydraulic lines

A small leak can be a big mess.Tighten fittings and clean up excess oil.Keep the press clean to help locate leaks as they develop and to help keep the press cooler.Measure fluid levels and top off as necessary.Most presses have an oil tag on the machine describing the type of oil to be used.

Check for loose bolts

Some dies can cause vibrations that can loosen bolts over time.Tighten bolts and clean up around the work area.Make sure there is lubrication on the guided plates.Some bushings will have greased fittings to keep lubrication over the rod.Do not over grease,this causes dirt accumulation and the bearings will wear.Other bushings have a check valve type fitting,which have graphite impregnated into the bronze and require little maintenance.

Inspect the oil temperature.

Let the machine warm to operating temperature.When the press has reached its normal operating temperature,it should be around 120 degrees F.Check the ram.A press’s ram should be moist but not dripping oil.Be careful to not over grease because this causes dirt to accumulate,causing the bearing to wear prematurely.

Check light curtain function

The ram may become out of center in the cylinder due to wear of the platen gibs.Break beam while ram is traveling down,Whenever the platen gibs are shimmed,check the ram position and readjust.Breaking beam on the upward stroke may not stop the press.If platen gibs are not kept properly adjusted,damage to the main ram and cylinder bushing may occur.

FAQ

Q: What is the stretch forming process?

A: Stretch forming is a metal forming process that simultaneously stretches and bends a selected material over a machined form,called a die,to form a part with one or several different curve radii.This process produces perfectly curved parts with smooth,wrinkle-free contours.

Q: What are the advantages of stretch forming?

A: Approximately 70% less force is needed than that required for conventional press forming.Stretch forming can reduce material costs by as much as 15%.Although allowance must be made on the stock for gripping,it is gripped on two ends only.

Q: What is a forming press?

A: A forming press,commonly shortened to press,is a machine tool that changes the shape of a work-piece by the application of pressure.The operator of a forming press is known as a press-tool setter,often shortened to tool setter.

Q: What are the four methods of stretch forming?

A: Stretch draw forming,rotary stretch forming or stretch wrapping,compression forming,radial draw forming.

Q: What is the difference between stretch forming and bending?

A: Stretch forming is ideal for creating complex shapes and curves in materials with high yield stress,while bending is generally employed for creating simple shapes.The differences between these two processes include the shapes they can create,the materials used,accuracy,time,and scalability.

Q: Why is press forming used?

A: Presses are suited for mass production because press forming can quickly produce the same product over and over again,and presses are widely used around the world in the automotive industry as well as in the factories of other industries.

Q: What material is used for press forming?

A: When press forming low carbon steel,dies are made from a wide range of materials,including plastics,cast irons,tool steels,and cemented carbides.

Q: Why is press forming suitable for stainless steel?

A: Press breaking and roll forming.Due to its inherently higher strength and work hardening tendency,springback is much greater for stainless steels.

Q: What is the difference between stamping and forming?

A: Since roll forming uses a continuous process and a single set of tools to generate parts,it requires less tool maintenance overall.Metal stamping will generally require more maintenance or part replacement,but this depends on the volume of parts that you're manufacturing.

Q: Can stainless steel be press formed?

A: A hydroforming machine or hydraulic press creates downward force on a stainless steel blank placed over the block,and the material is shaped into the desired component.

Q: What is the Pascal's law of hydraulic press?

A: A hydraulic press works on the principle of Pascal's law,which states that when pressure is applied to a confined fluid,the pressure change occurs throughout the entire fluid.Within the hydraulic press,there is a piston that works as a pump,that provides a modest mechanical force to a small area of the sample.

Q: What are the advantages of stretch forming?

A: The main advantage of stretch forming is its ability to form complex shapes accurately while maintaining a parts dimensional cross section shape and quality finish.As a cost-effective process,stretch forming uses less force than any other press forming method and can reduce material costs.

Q: What is the stretching process like?

A: Stretching is the sheet metal forming process where the punch which creates the part shape forces the sheet metal to thin since lock beads prevent metal flow inward from the flange area.In contrast with drawing,significant metal thinning occurs in stretching,especially in the biaxial tension mode.

Q: How does hydroforming work?

A: Hydroforming is a specialized deep draw process that uses high-pressure rubber to shape and form metal workpieces.In sheet hydroforming,a metal sheet is placed over a die before highly pressurized water forces it down and makes it conform to the shape of the mold.

Q: What are the advantages of hydro forming process?

A: Hydroforming is suitable for limited production runs of metal parts with irregular contours that cannot be formed by stamping.Additionally,unlike metal spinning, hydroforming allows fabricators to process extremely thin metal sheets and maintain original metal finishes.

Q: What are the two principal advantages of the hydroforming process?

A: Hydroformed parts allow for parts consolidation,the reduced number of sub components reduces assembly costs and increases strength and stiffness of the final assembly.

Q: What metals are used in press forming?

A: Depending on the properties needed for your product,you can choose from a range of metals and alloys,including stainless steel,aluminium,copper,and bronze and create parts with different thicknesses and shapes,depending on the needs of the application.

Q: What is the process of wrap forming?

A: During the metal stretch forming process,metal sheets or extrusions are stretched to exceed their inherent elastic limit and formed around contoured dies to create the desired shape.This stretching results in an increased material yield strength and a stronger finished part.

Q: What is the stress in stretch forming?

A: For the bending process,the tensile stresses are one dimensional,and for the stretch forming process,the stress state is biaxial tension.

Q: Pressurizationof the hydraulic cylinder

A: When the main cylinder of the hydraulic machine descends slowly to contact the workpiece,1Y A a is energized,the upper position of the valve 1 is connected to the system,and the pressure of the hydraulic system is increased.The pressure in the upper chamber of the master cylinder is continuously increased,and the output flow rate of the constant power variable plunger pump is continuously reduced,the pressure is continuously increased,and the workpiece is pressurized.

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