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closed die forging dies
Closed die forging dies,normally consists of forging dies,trimming dies and sometimes flat dies.Like dies for the punch-press,are of several different types.Perhaps the most simple form of closed die forging die would be a pair of dies for producing a simple round forging,as,for instance,a gear blank.These dies would require a central impression turned in each of the dies of the pair.Before using the dies,a square plate of steel is worked under the hammer,drawing out a short shank at the side,and "knocking down" the corners.This roughly shaped block of steel is held by the shank and placed between the dies and thus brought to shape.


The most common form of closed die forging die,however,is the one in which there is a central impression to shape the forging,and a side impression,called the "edger," "break-down" or "side-cut,"that helps to properly distribute the hot steel(refer to select die material of closed die forging).To make clear the use of these two sets of impressions,a closed die forging die of this description may be likened to a drawing of the finished forging,in which the outline of the central impression would resemble the plan view of the forging,and the two halves of the edger would correspond to the side elevation of the forging.Of course this illustration is not literally correct,but it expresses the general idea.The edger is always on the right-hand side of the die,and the steel bar is struck first in the break-down,edgewise,and then turned and struck flat in the impression,alternating in this manner until the forging is "full." 

According to the advantages of closed die forging,it has become one of the main metal forming processes in modern manufacturing.For its wide range of material specifications and 
shapes,closed die forging can be useful for lots of metal components,such as componets for aeroplane,cars and heavy trucks,shipbuilding,ect.

With the characteristics of closed die forging,we can make precision components with different wall thickness,complex shapes,narrow tolerance.And we are all equiped with full range of machining equipments,so machining is also feasible in our company.Maybe sometimes you could also consider casting process instead,but by comparison,there  are both price advantages and quality advantages over casting,we will no need to worry about production defect.
automotive parts made by closed die forging
1. Background

Metals and alloys are able to be formed into desired shapes by plastic deformation.In deformation process,they also produce a wide range of properties particularly strength and toughness.The working of the metals into shapes by means of closed die forging methods refines grain structure,develops inherent strength giving characteristics,improves physical properties and produces structural uniformity free from hidden internal defects.What's more,the special feature of flow lines along the contour of the clsoed die forging produce marked directional properties.These features in closed die forgings give the automobile designers great confidence regarding the reliability of the vehicle.Learn more about advantages and disadvantages of closed die forging in detail...
Closed die forging is a metal forming process for small precision parts.We can take use of closed die forging process to desired shapes starting from steel billets.So closed die forging is widely used for all industries served for its unique advantages.Below are the advantages of disadvantages of closed die forging:

Advantages
*After heating by medium frequency furnace,steel billets will be placed between upper and lower dies and forged in several times at high speed,so that the shape will be deformed quickly.Such press process will make internal grain flow and increase the tightness and strength of products.
*It is no scientific to say closed die forging is expensive for its high tooling cost.Tooling cost of closed die forging is actually higher than that of investment casting for its high die material cost and complex processing process.But for large production runs,we must say it is more cost-effective.
Closed die forging is applied for almost all the metal materials,but in actual production,only part of the materials are used for the different characteristics of each kind.Material is also one of the main factors that affect the cost of closed die forgings.Below is the common material that used in closed die forging:

Steel
Steel is most commonly used material that for closed die forging.Such steel normally refers to alloy steel,carbon steel and stainless steel.In comparison,the metal flow of stainless steel is worse than other steel,so it is difficult to forge stainless steel billets into complex shapes.Stainless steel material is often used for components that require corrosion resistance and rust resistancel.Alloy steel and carbon steel are the most widely used in closed die forging production for its competitive price and easy deformation.We could choose alloy&carbon steel for almost all the industries.As a professional Steel forgings manufacturer,we can produce closed die forgings ranging from 0.2kg-50kg.

With API certified,Fly Drop Forge is good at supplying drop forgings for oil&gas industry.We have been manufacturing various forged fittings  to oil&gas developing equipment manufacturers or component dealers for more than 10 years.Worked as the fuction of connection,they require prefect assembling and could bear high pressure.Such pressure will be tested by air or water.With our closed die forging process,we could creat drop forged fittings with near net shape or net shape,so that machining cost can be reduced or avoided.The biggest advantages of drop forgings for oil*gas application by closed die forging process is that grain flow can greatly improve the properties of products and no internal defects will appear,so that the whole working condition is safe.
near net shape forging
Near net shape manufacturing technologies produce components that are close to the finished size and shape,requiring a minimal amount of finishing process such as machining.
Closed die forging is such a near net shape forging process that requires less or no machining.It will be helpful for us to save machining cost.

Why closed die forging is near net shape forging?

*Compared to machining process,closed die forging is a precision forging process with flash,so the only waste of material is just the flash section.We could also use machining to replace closed die forging process sometimes,but as the desired shape by total machining has be reached by machining equipments,so much of material will be wasted.
Here the "closed die forging" and "machining" are the two different metal forming processes for the same product.

Closed die forging is a forging process that made from special bar quality steel.As steel bars are usually rolled,the grain structure within the steel is forced to flow along the centerline of the bar.When a forging is produced from the bar,this inherent grain flow bends to follow the contour of the forged shape,thus producing a superior part.The structural reliability of forgings allows designers to trust the material to adhere to the safety factors of the design.It also can provide more uniform response to heat treatment and machining operations.

Machining is a precison processing process that machines from bars directly with machining equipments.Machining will by definition cut through part of the grain flow.This renders the material more liable to fatigue and more sensitive to stress corrosion cracking.
The good quality in the drop forging is resolute by just a selection of variables.Generally,the decision of steel ingots with really smooth and refined surface at the same time as improvement made towards the entire operation approach can make excellent difference to the quality in the steel components that are to be drop forged.

Usually,the steel ingots or steel billets of which the alloy mold is created have several defects around the surface,like cracks,mixtures,scab,and so forth.So as to steer clear of these defects or avoid them from being worse throughout the method of heating and forging,there’s a need to dispose of those defects.The prevalent disposal techniques for the surface of these ingots include grinding,flame cutting,sand blasting for example.

Closed die forging is also named as impression die forging.In impression-die work metal is placed between upper and lower dies that attached to the anvil.Usually the hammer die is shaped as well.The hammer is then dropped on the workpiece so that the metal flows and fills the die cavities.The hammer is generally working on the workpiece at the speed of milliseconds.Depending on the size and complexity of the part the hammer may be dropped several times in quick succession.Excess metal is squeezed out of the die cavities,we call this flash.The flash cools more rapidly than the rest of the material;this cool metal is stronger than the metal in the die so it helps prevent more flash from forming.This also forces the metal to completely fill the die cavity.After forging,the flash is removed by punching machine(Of course,trimming die will also first made together with forging dies).

Background:Introduced to Fly Drop Forge during a trade show nearly 3 years ago,a U.S.-based manufacturer was seeking a closed die forging manufacturer to bridge the gap between their domestic operations and a client's goals of overseas saving.

Challenges:Aside from showing a cost savings,quality was the biggest challenge on this project.The closed die forging being requested had not been manufactured successfully overseas on a consistent basis by many factories.Fly company had to not only learn the product,but also creat the closed die forging processes through which super-clean parts that were adherent to tolerances could be produced.
The techniques of closed die forging are capable of achieving some of the strongest metal products when compared to other manufacturing processes.During the process of closed die forging,forging operations used can seal any cracks or empty spaces of the billet,therefore creating very strong metal parts.The typical method that can achieve this is known as closed die drop forging,which is when a plate of metal is placed between two dies,and then compressed under extreme pressure within the closed cavities to form the shape between the molds.The cavities restrict the flow of the metal inside the die (mold),and the metal will flow to fill the space within the cavity,resulting in the shape and dimensions of the mold design.Depending on the type of metal used,this process can be done while the metal is hot forging.

The Closed Die Forging process forces the material to flow and fill the space in the mold also changes the grain structure of the metal while making the product very strong.The flow is controlled in the direction what will achieve the strongest results and best grain structure.The high pressures of the process condenses the individual grains of the metal,resulting in higher density of the material and stronger properties.