Full Guide to Metal Stamping: Process, Techniques ...

Aomate are exported all over the world and different industries with quality first. Our belief is to provide our customers with more and better high value-added products. Let's create a better future together.

Through the cold-forming process of metal stamping, sheet metal is transformed into different shapes. The metal-stamping process uses a combination of dies and stamping presses to convert pieces of flat metal into usable shapes for a variety of industries.

From the automotive industry to aerospace projects to medical machinery, many industries throughout the globe heavily rely on metal stamping for their equipment. There is an increasing need worldwide for mass-produced quantities of complex parts, and metal stamping is a cost-efficient way to do so.

Metal stamping is a complicated process that can be completed through a variety of
 metal-forming techniques. Some examples include bending, punching, blanking, spinning, hydroforming, or piercing the metal to alter it to the ideal shape.

In this article, we&#;ve outlined the metal stamping process and some different types of metal stamping techniques to help you get a better understanding of how this process works.

What Is Metal Stamping?

The metal stamping process also referred to as metal pressing, consists of taking flat sheet metal and feeding it into a stamping press. This press then uses pressure and die to transform the metal into the predetermined shape.

Some examples of stamping techniques used include punching, coining, embossing, bending, blanking, and flanging.

To ensure the metal piece turns out the way it is supposed to, stamping professionals need to use the design tool that comes with CAD/CAM engineering technology. These designs must be as accurate as possible for each part to come out looking and operating how it should.

Because the metal stamping process can turn out a high volume of the same part in a short amount of time, it is used in a variety of industries.

Metal stamping can help produce:

• Hardware such as nuts, bolts, screws, hinges, and washers for shelves, custom switches, doors, lighting, etc.
• Specialty stamped hardware that includes products such as household tools, locks, power tools, mounting brackets, etc.
• Electrical components such as cups, covers, fasteners, clips, and sensitive electronic assemblies.
• Durable, high-quality parts for the construction industry that will stand the test of time.
• Fastening solutions such as bolts, hooks, or complicated contact elements.
• Components for appliances such as grills, ice machines, microwaves, cooktops, ranges, fryers, griddles, toaster ovens, disposal systems, and more.

Not only can metal stamping machines stamp, but they can also cut, punch, cast, and shape metal sheets into their desired shape and size. Stamping machines are designed to be as accurate as possible, and they can also be programmed to ensure accuracy.

Types of Metal Stamping Techniques

There are a variety of metal stamping techniques that are utilized for particular applications. We&#;ve outlined some examples below.

Progressive Die Stamping

This metal stamping technique breaks down the process into a series of stations that each serve a different function. The stock strip carries the part from one station to the next until it is finished and removed from the strip.

The original metal strip travels from its coil and makes its way into the die press. From there, the metal moves horizontally across each station. As soon as the desired bend, punch, or cut is made, the part moves onto the next station until it&#;s completed.

The part is still connected to the metal strip while it is being altered, so each movement must be as accurate as possible. This precision and accuracy assure that the end part is accurate and usable.

Progressive die stamping is a beneficial way to produce mass quantities of parts at a low cost, making it an attractive option for many. The die lasts for a long time and it&#;s easy to repeat the process as many times as needed. This type of metal stamping also produces minimal wasted scrap.

However, without a high level of precision and accuracy during progressive die stamping, the parts may not be accurately made.

Transfer Die Stamping

Another type of metal stamping is transfer die stamping. It is similar to progressive die stamping, but a mechanical transport system moves the part from station to station instead of an automated strip. This type of stamping is useful for making parts that need to be free from the metal strip during the stamping process.

This may be a single die on its own or it may require multiple dies or machines in a row to create a makeshift production line.

The lower tooling costs associated with transfer die stamping make it an excellent option for production. They are also versatile and can produce features such as cut-outs, ribs, knurls, threading, and pierced holes. This means that no secondary operations are required, further cutting back on cost.

Transfer die stamping is used in markets such as agriculture, automotive, locomotive, electronics, medical, recreational vehicles, and more. It&#;s beneficial in creating larger, bulkier parts that may require the use of multiple presses.

Fine Blanking

Another type of metal stamping is fine blanking, also referred to as fine-edge blanking. This specialty type of metal stamping is ideal for achieving flatness and a full-sheared edge in a way that other metal stamping techniques cannot.

This technique uses cold extrusion and it is a single-step process, resulting in a lower fabrication cost.

Fine blanking is typically completed using a hydraulic or mechanical press, or a combination of the two. There are three recognizable movements used in the fine blanking process:

1. Using the workpiece&#;s clamp to hold the workpiece or work material in place
2. Completing the blanking operation
3. The finished part is ejected

The product is manufactured and needs to have complete contact with the surface on the part&#;s edge to be effective.

One example of a part that is often made using fine blanking is a gear. Gears require flatness in certain areas and every tooth needs to be fully engaged to be effective, making fine blanking the perfect candidate for this type of production.

The fine blanking press runs at much higher pressures than more conventional stamping techniques, so the machinery must be designed to withstand these higher pressures.

Four-Slide Stamping

Four-slide stamping, also referred to as multi-slide stamping, uses four tools simultaneously to form the piece into the proper shape. As the metal sheet is fed through the four-slide, it is quickly bent by each shaft.

It is ideal for producing products that require intricate cuts or complicated bends. While other metal stamping techniques use a vertical slide during production, four-slide stamping uses four different sliding tools to shape the metal piece.

The tool slides used in four-slide stamping are highly productive and straightforward, meaning this is an ideal method for creating complex or multi-part bends, even bends that are larger than 90 degrees. Multiple bends, punches, folds, or cuts can be completed in just one step.

Another advantage of four-slide stamping is the tooling itself is relatively inexpensive and there is minimal waste produced during the process.

Types of Stamping Presses

Stamping presses play an integral role in the process, and there are three common types: mechanical, hydraulic, and mechanical servo. The distinction between the three types comes from the power source.

In most cases, the stamping press is linked to an automatic feeder that moves the sheet metal through the press. We&#;ll get into detail on each type of stamping press below.

Mechanical

Mechanical stamping presses have a motor that&#;s connected to the mechanical flywheel. The flywheel then stores that energy to help the machine operate. These presses can produce a variety of punch sizes, ranging anywhere from 5mm to 500mm depending on the specific press being used.

The speed of mechanical presses ranges as well. It can operate as slow as 20 strokes per minute or operate as fast as 1,500 strokes per minute. In the case that additional energy is needed when the speed is lower, the operator can add an auxiliary flywheel to the drive. Mechanical presses are typically faster than hydraulic presses, however.

The press stroke length is kept as short as possible because it has such an impact on speed. On average, each stroke is 2 inches.

The operator of the mechanical press will use electronic control, a clutch, and a brake to help engage and disengage the press drive as necessary.

Mechanical stamping presses are most often used to create simple and shallow parts made from coils of sheet metal, most notably for large production runs for transfer and progressive stamping.

Hydraulic

As the name implies, hydraulic stamping presses use the hydraulic fluid as the power source. The technology used in hydraulic presses has significantly improved over time, with each improvement offering an upgrade in electronics and valves.

The hydraulic pistons release fluid that has a proportional amount of force to the piston head&#;s diameter. This allows for a high level of control over how much pressure is applied at any given moment. Despite so much flexibility in its stroke and speed capabilities, hydraulic presses can still deliver full power at any point in the stroke.

The pressure used in hydraulic presses may be preset by the user. The velocity can also be tweaked to adjust how fast the slide travels while the die closes. When the right pressure level is achieved, the valve helps activate pressure reversal to avoid overloading.

Hydraulic presses range anywhere from 20 tons to 10,000 tons. Their stroke sizes are anywhere from 10mm to 800 mm. This type of press is ideal for creating small, intricate parts thanks to its changeable stroke length and consistent pressure.

Mechanical Servo

Mechanical servo stamping presses don&#;t use flywheels as their power source. Instead, they rely on high-capacity motors to ultimately create intricate designs at a faster pace than standard hydraulic presses.

Servo presses are highly programmable, making it easy to have control over the stroke, slide position, motion, and speed of the press. These machines operate on a link-assisted drive system or a direct drive system.

Their high speed and high levels of customization make mechanical servo presses the most expensive option out of the three.

Types of Stamping Dies

Now let&#;s discuss the dies used in metal stamping. There are two types of dyes used: single-station dies or multi-station dies.

A single-station die is made from compound dies and combination dies; a compound die is capable of performing multiple operations in a single press. For example, if a steel washer needs to be made in a single press, it would need multiple cuts, thus requiring compound dies.

Combination dies use cutting and non-cutting operations in one stroke. For example, a combination die may produce both a cut and a flange when shaping a metal blank.

The other type of die used in metal stamping is multi-station dies. Progressive dies and transfer dies are included in this category. Examples of operations resulting from this die-set include cutting, punching, or notching.

Another noteworthy die used in stamping presses is steel rule dies, commonly referred to as knife dies. This type of die was first used on soft non-metal materials such as paper, cardboard, or leather. Over time, knife dies have also been utilized on copper, brass, and aluminum.

Metal Stamping Advantages and Disadvantages

Let&#;s now compare the pros and the cons of metal stamping.

Advantages of metal stamping include:

• Compared to other stamping processes, the costs of metal stamping are low.
• High levels of automation compared to other presses.
• Not as expensive to produce or maintain compared to those used in other processes.
• More affordable secondary costs such as plating or cleaning.
• Can use highly technical computer programs to provide increased precision.
• Overall faster production and turnaround time with metal stamping.
• Low cost of labor thanks to how automated this process can be.

On the other hand, there are also some downsides to metal stamping. Disadvantages of stamping include:

• The presses themselves are extremely expensive and heavy to transport.
• It&#;s not always easy or fast to acquire the dies needed in metal stamping.
• If custom dies are used, the pre-production process takes longer.
• If dies need to be changed in the middle of production due to a change in design, it can be difficult to achieve.

Applications of Metal Stamping

Now that we&#;ve covered the basics of metal stamping, let&#;s look at how this process is used and applied. It is used in a variety of ways, especially for the creation of three-dimensional designs. Chances are high that there are appliances or light fixtures in your home that were created through metal stamping.

It is utilized in the automotive industry, the lighting industry, the automotive industry, the medical field, the electronic industry, telecommunications services, and so many more. From simple components to extremely intricate machines and parts, metal stamping has seemingly endless applications.

For more information, please visit metal stamping machinery.

Conclusion

Metal stamping is a widely used process that has applications relevant to your daily lifestyle. If you&#;re interested in learning more about metal stamping or any of our other metal capabilities, Schaumburg Specialties is happy to assist you.

We&#;ve been serving the Chicagoland area for decades, and we&#;re looking forward to helping you next. Fill out our contact form, and our team will be in touch with you soon!

At Clairon Metals Corporation, we are a premier contract manufacturer offering a variety of metalworking services to customers across a wide range of industries. One of our core service offerings is metal stamping, both progressive and hand transfer. Armed with over 30 years of industry experience and advanced equipment, we have the knowledge, skills, and tools to provide comprehensive production solutions for simple to complex stamping projects.

What Is Metal Stamping?

Metal stamping is a metalworking process that employs tool and die sets and specialized presses to form metal sheets and coils into net shapes. It is a cold working manufacturing method, meaning it typically creates the desired parts and products from room temperature materials in room temperature conditions.

Compared to other manufacturing methods, metal stamping offers a number of advantages. For example:

• It produces strong and durable components that conform to tight tolerances.

• It allows for quick and cost-effective production of identical pieces in high volumes.

• It utilizes tooling made from durable materials, which enables them to withstand thousands of cycles without sustaining excess wear.

The process encompasses a variety of metal forming operations, such as:

• Bending:

  This stamping process forms bends and/or curves in the component.

• Blanking:

  This stamping process cuts the component from the larger piece of metal.

• Coining:

  This stamping process creates fine details on the surface of the component.

• Embossing:

  This stamping process creates raised or recessed patterns or designs on the surface of the component.

• Flanging:

  This stamping process creates flanges on the ends of the component.

• Punching:

  This stamping process forms holes in the component.

• Extruding:

  This stamping process draws material into a punched hole to create a circular flange

• Drawing:

  This stamping process pulls or stretches material into shapes that wouldn&#;t normally be formed without wrinkling of the material

These operations may shape the material (e.g., bending) or trim, cut, or bore the component. Many stamping projects combine multiple stamping operations into a single cycle to increase production efficiency and, consequently, decrease production costs.  

Types of Metal Stamping Methods

Two of the primary metal stamping operations are: single hit and progressive die operations.

• Single-hit dies

  are typically less expensive and smaller but require interaction with the die and press for each single operation or stroke to be completed. The dies can have one station or multiple but an operator puts in a blank or moves the parts from station to station and presses palm buttons after each move to stroke the press and hit the part or parts in each station.  This can be automated to transfer the blanks or parts between stations but the blanks and parts are independent of each other.

• Progressive dies

  have a series of stations in one die through which coils of steel or strips are fed automatically from which a complete part typically comes out after being processed through all stations in the die.  The press strokes automatically and a feeder advances the material with each stroke.  You can watch the part go through all the stations and become a completed part which exits the die onto a chute or conveyor typically.

Single hit dies run slower than progressive dies but can sometimes produce features that are difficult if not impossible in a progressive die and can be very expensive, however progressive dies are fast and very consistent to reduce cost and improve repeatability.  

At Clairon Metals Corp., do a high percentage of progressive die handling volumes from thousands to millions of parts per year.

Stamping Characteristics:

There are many characteristics of stampings which are part of the process and should be considered when designing stampings such as:

•  

  Edge condition &#; A stamped edge or sheared surface has both shear and breakaway.  The amount of breakaway or roughness on the edge depends on die clearance.

•  

  Radii and Burr &#; the top edge of a sheared surface has a radius while the bottom edge has a burr that is typically less than 10% of material thickness

•  

  Gussets &#; These are formed ribs typically in corners that can provide significant added strength to reduce weight.

•  

  Galling &#; Formed and drawn surfaces can show signs of material dragging on the surface which can create an unacceptable cosmetic condition.

•  

  Thinning &#; When drawing material it can thin as it stretches but this can be controlled.

•  

  Lancing &#; Stampings can be only partially punched leaving a tab that is still connected and embedded in the material.

•  

  Compressing &#; It is possible to decrease the thickness of the steel in the area by compressing the steel in the press.

There are these and many more characteristics that should be considered for the best design and cosmetics of your part.

In-Die Tapping

Many other operations can be incorporated into stamping dies and tapping is one example.  Tapping refers to the process of cutting or forming threads into holes. While many metal stamped components require this design element, stamping companies do not have experience with this in die tapping capability. As a result, tapping was performed after the completion of the stamping process, which increased lead times and labor costs. As stamping technology advanced, however, in-die stamping became possible.  

In-die tapping uses specialized in-die tapping units which can be fitted to the stamping dies. They enable metal stampers to combine the stamping and tapping process into a single step, allowing for the production of complete stamped and tapped parts without the need for a separate tapping step. By replacing separate tapping operations with in-die tapping operations, metal stampers can decrease labor costs while increasing production rates.

Contact Clairon Metals for Your Metal Stamping Needs Today!

Whether you need progressive die stamping, transfer die stamping, or in-die tapping for your metal stamping project, Clairon Metals Corporation has got you covered. We offer metal stamping capabilities for simple to complex components and medium-volume to high-volume production quantities. 

We work with a variety of ferrous and non-ferrous metals, including, but not limited to, low-carbon cold-rolled and hot-rolled steel, high-strength, low-alloy (HSLA) coil, high-carbon, and spring steel, prepaint coil, galvanized and galvalume steel, and stainless steel.

In addition to our metal stamping capabilities, we offer a variety of other services to support customer projects, such as:

•  

  Engineering design consultation

•  

  Prototyping

•  

  In-house tool/die design and construction

•  

  Manual and Robotic

  Welding

•  

  Secondary machining and assembly

•  

  Custom packaging

To learn more about our metal stamping or other services, contact us today. 

To discuss your next metalworking project with one of our experts, request a quote. Our team will work with you one-on-one to determine the most effective and affordable manufacturing solution.

The company is the world’s best h-frame double point precision presses supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.