How to Make Dies For a Hydraulic Press

Hydraulic presses offer unmatched force and accuracy in material shaping processes. Their efficient functioning eliminates many factors that are costly to operate or maintain, saving both time and money on maintenance and upkeep costs.

Hydraulic die forming has come to replace hammer forming as an effective tool and die maker can now utilize this technique to produce various shapes in metal. Hydraulic die forming uses hydraulic pressure to compress metal into negative, restrictive die shapes with positive forms on both sides allowing him or her to create multiple types of shapes from metal.

Preparation

The press consists of a welded steel frame fitted with a hydraulic ram. The hydraulic ram presses one die against another by pressing them together; dies may be composed of cast iron, Devcon or another material depending on your application - however all materials used should be hard and ductile enough to allow for cutting/pressing while soft enough for metal shaping.

Die preparation is essential to producing quality finished products from your press. Lubricated dies reduce friction during pressing and help avoid cracking of material in the die. In addition, release agents may be needed between die and model/plaster so it can easily separate when time for removal.

Nested type plates are widely utilized as die main plates in medium or higher volume production environments. These plates may be made of S50C material without heat treatment or of SK materials that have undergone this treatment, such as SKD11, SKH51 powdered high speed tool steel and cemented carbide.

Blanking dies can be used to transform a flat sheet into the shape of a cuff bracelet or ring blank, with Lexan being an extremely high density polycarbonate that's shatterproof. Permanent reusable blanking dies may also be made from harder materials like abrasion-resistant plastic or tool steel; these permanent dies can then be reused multiple times with little cleaning required; some dies come equipped with protective backers like tin or lead that protect both them and help avoid damaging an annealed metal during formation.

Design

Hydraulic presses are an indispensable manufacturing tool, as they apply large amounts of pressure to metal to flatten, shape, straighten, stamp and bend into various designs and forms. A variety of hydraulic press machines exist such as H frame hydraulic press machines; each comes equipped with its own pressure cylinder, pump and moveable support mechanism.

Design of a hydraulic press machine is of utmost importance in terms of its overall strength. Design should consider safety when considering layout of cylinders and pillars as well as support of and sealing of the hydraulic cylinder.

Good design should provide for simple maintenance and repairs, easy adjustment for different applications and handling various tonnages. A hydraulic press provides for easier operating process than other mechanical equipment and has lower maintenance costs than its counterparts.

Hydraulic cylinders are essential components of hydraulic presses, and its dimensions must be precisely controlled for accurate results. A good hydraulic cylinder should be long and wide with two ports for receiving input/output of hydraulic fluid and fitted with a pressure meter to monitor how much force is exerted by its ram.

The ram should be fitted with a die that can accommodate the desired form, as well as a clamp to secure metal into place. Cast iron or aluminum dies should be constructed from strong material to minimize potential damage from high-pressure hydraulic rams; additionally, they should be coated with protective oil to reduce friction and wear as well as regularly cleaned to prevent corrosion.

Materials

Die materials needed to use a hydraulic press depend on the desired form. When metal forming is desired, sheets of annealed metal are formed into shape using a die press and removed if necessary (a matrix). A conforming die may also be created using plasticene, plexiglass or masonite pieces with doublestick tape on both sides attached as needed; or Lexan, which offers high density polycarbonate with shatter resistant properties can provide permanent reusable dies.

Assuming you want a reversible die, start by creating a model of the design to be created. This could be as simple as drawing an outline of an object but nothing too intricate. Secure this to a flat base such as steel pipe or block of plexiglass and then cover everything with pasticene for protection.

Utilize a course file to remove excess pasticene. After carefully sawing out your model from its base, carefully saw off its shape using a spiral saw blade, leaving an edge free from stress points for your conforming die.

For creating the master cylinder, two primary cylinders must be linked together by a pipe containing oil or another liquid under pressure, creating hydraulic force which presses against ram in larger cylinder to deform metal. Reversible die may or may not require matrix; conforming die will always need one; typically metal such as SS400 or S50C without heat treatment are used; pre-hardened or even heat treated SKS3 or SKD11 may also be utilized depending on machining tolerance requirements.

Cutting

Plastic steel or cast epoxy-steel is the optimal material for creating dies, as it won't rust or wear out quickly and can be formed into complex forms. When casting dies, ensure they are flat and free of undercuts before using them - this is particularly important if creating intricately twisted rings, which must fit snugly around someone's wrists.

Metal to be sheared is placed on the upper platen of a hydraulic press with its die positioned over it, then sprayed with silicone or another form of lubricant before its ram is lowered onto it to create strong mechanical pressure that shears it into desired shapes more quickly than sawing or hand-held punching can do; additionally it can produce intricate shapes difficult to cut with other tools. The hydraulic press makes an excellent tool for shearing metal since its fast production produces shapes faster than sawing or hand-held punching can do; creating intricate shapes otherwise impossible with other methods.

Shearing can also be an effective way to form curved shapes, but you must use caution not to apply too much force, as excessive force could result in broken or bent metal sheets. To prevent this from happening, the die should be protected with layers of masonite or plexiglass; to maximize surface protection further add strips of hardwood as an overlay layer. Once shearing has finished it is recommended lubricate pins with silicon spray so that they move more freely during blank removal; finally allow four hours before using this die again!

Pressing

Prior to pressing, it is essential that your press plates are parallel and that the sample is level as much as possible. In addition, ensure your pressure and force gauge is functioning as intended and that its maximum pressing load/pressure suits your needs - see our product page for this information - using either ram adjustment wedges or screw devices depending on your press to achieve snug fitting rams - remembering to insert and remove a safety block after each use (independent of how movable die sets operate) easily; additionally a power cut-off interlock system would prevent accidental strokes!

Pressing options vary considerably when it comes to press dies, from an adapted masonite die suitable for gently sloping curves with wide radius and minimal detail, through male and female conforming dies cast from metal or pourable epoxy-steel casting if your work involves intricate details or tighter curves; to using one for production runs of 10+ units. The more complex your design, the greater consideration should be given towards using conforming dies as they offer greater precision than using just an adapted die.

Make sure that you have access to some ancillary equipment, such as conveyors, ejectors, and part sorters. They will greatly increase production rate as well as your ability to produce parts with very high levels of finish. Having a scale drawing of your design to work from can ensure dimensions are accurate as well as ensure that die will make desired shape.