What Is Metal Spinning? 

Metal spinning (also known as spin forming, metal spin forming, or sheet metal spinning) is a chipless cold-forming process. By applying continuous pressure to the rotating metal disc or preformed billet, it gradually deforms along the mold and forms an axially symmetrical hollow part.

Compared with stamping, deep drawing or machining, metal spinning has lower tool costs, a shorter cycle from prototype to mass production, and higher material utilization. This process is widely used in the production of products such as conical, hemispherical, cylindrical, parabolic, angular, vase-shaped or bell-shaped items, such as lampshades, reflectors, heads, cylinders, horns, etc.

How Does CNC Metal Spinning Compare to Traditional Metal Spinning?

CNC metal spinning and traditional metal spinning have the same forming principle, but CNC spinning uses programmed machine movements to control the spinning tool more precisely. This makes CNC metal spinning easier to repeat, automate, and manage for your complex or higher-volume production.

If you need to produce the same or similar parts repeatedly, CNC metal spinning can provide more consistent dimensions, process control, and production efficiency. 

How to Choose a Metal Spinning Machine?

When choosing sheet metal spinning machines, you should not merely consider the machine’s price or the maximum processing diameter. Instead, you should make a comprehensive selection based on the workpiece size, material, material thickness, product shape, and processing accuracy.

Select the Machine Specification by Workpiece Diameter

First, you need to determine the workpiece’s maximum diameter and leave a reasonable allowance for the machining. Different types of spinning machines’ processing range varies. Our spinning equipment covers a workpiece diameter of approximately 320-1,520 mm. It is not recommended to select only based on the current product’s maximum size, you should also consider the possible future addition of product specifications.

Consider the Materials and Thickness

The forming characteristics of aluminum, stainless steel, iron and brass are different. The requirements for machine rigidity, spindle power and rotational pressure vary for the same material at different thicknesses. For example, thicker stainless steel or aluminum typically requires higher forming capabilities. 

Therefore, before purchasing, you should provide the specific material type, material thickness and blank size so that we can confirm the suitable model.

Determine the Product Shape

Different product shapes have different requirements for the spinning machine’s structure and the tool’s configuration. Simple cylindrical, conical parts and lampshades can adopt basic configuration, while domes, spherical parts, parabolic parts and complex rotary bodies may require more axes, tool towers or double-rotation structures. 

Select the Automation Degree by Production Volume

If you mainly engage in sample, small-batch or multi-variety production, you should primarily consider the spinning machine’s flexibility and changeover efficiency; if you need to produce a large quantity of the same workpieces over a long period, you should focus on CNC control, repeat production accuracy, and the automation degree. 

For batch production, a stable and repeatable processing process is usually more important than simply pursuing a higher maximum processing size.

Match Factory Conditions

Before making the purchase, you also need to confirm whether the sheet metal spinning machine is suitable for your factory environment, including voltage, air source, installation space, machine weight and lifting conditions. 

If the local voltage is not the standard 380V, you need to confirm whether the electrical configuration can be adjusted before placing the order to avoid additional modifications after the machine arrives.

Confirm the Tool and Mold Requirements

The metal spinning machine itself is merely a forming equipment. Tools, molds and fixtures can also affect your final product’s quality. Confirm whether it can provide corresponding tools and processing procedures according to your product. If your product shape is complex, it is best to conduct trial spinning verification in advance.

Aluminum, Copper, Brass, Iron, Stainless Steel: Which Metal Spins Best?

These metals can all be subjected to spinning press forming, but their ductility, hardness, processing hardening characteristics, and required spinning pressure vary. Therefore, no single material is “the best” for all applications.

• If we simply compare the difficulty of spinning forming and processing properties, aluminum is a relatively easy material to spin because it has good ductility and formability, and is suitable for producing lampshades, reflectors, cookware, and various thin-walled rotating bodies.
• Copper and brass also have good ductility and spinning performance, and can meet the requirements of heat conduction, electrical conductivity, or decoration.
• Iron generally requires higher forming force than aluminum or copper, so machine rigidity and power are important.
• Stainless steel has higher strength and processing hardening characteristics, and the requirements for machine rigidity, spinning pressure, and process control are usually higher, so the processing difficulty is relatively greater. However, for products that require high strength, corrosion resistance, and durability, stainless steel is still a common material for spinning.

Therefore, there is no “best spinning metal” suitable for all projects. The actual selection should be based on your material grade, thickness, workpiece diameter, product shape, and production requirements, and then determine the appropriate spinning machine and processing parameters.

Metal Spinning Applications by Industry

Different industrial fields have different requirements for the metal stamping parts size, material and performance. Spinning can be applied in the following common industries:

• Oil and gas industry: used for processing caps, conical parts, container components, etc.
• Automotive industry: used for lamp covers, hub components, exhaust system parts, and other rotating body parts.
• HVAC industry: used for ducts, ventilation hoods, connectors, conical pipe components, etc.
• Kitchenware industry: used for cookware, pot covers, bowls and basins, containers, and other circular metal products.

You can choose the appropriate spinning equipment and process parameters based on different materials, workpiece diameters, thicknesses and shapes.

Hot Spinning vs Cold Spinning: When to Heat the Blank

The main difference between hot spinning and cold spinning lies in the processing temperature. 

Hot spinning is carried out by heating the material or operating it at a high temperature, which can reduce the material’s deformation resistance and is suitable for thicker, higher-strength or more difficult-to-form materials. Cold spinning is performed at room temperature, and the dimensional accuracy and surface quality are usually better, making it suitable for materials such as aluminum, copper, stainless steel, as well as thin-walled parts.

How Much Does a CNC Metal Spinning Machine Cost?

The price of a CNC metal spinning machine mainly depends on the machine specifications, the maximum stamping diameter, the material thickness, the shaft number, the stamping tool configuration, and the automation degree. Small and basic equipment usually has a lower price, while heavy-duty stamping machines for large workpieces or thick plate processing will have a higher investment.

If you need an accurate quote, please provide your workpiece diameter, material, thickness, product shape, production volume and equipment requirements. Based on the specific project, we can obtain the quote for the appropriate model.