Parting-off steel - precision and efficiency when parting off in metalworking

A parting tool is an indispensable tool in machining technology, especially in turning. It is used to cut workpieces axially, to cut grooves or to precisely cut off sections. Choosing the right parting steel plays a decisive role in the quality, precision and efficiency of the machining process.

Areas of application and advantages

Cut-off steels are used in both individual and series production. They are in demand wherever workpieces need to be cut off precisely or defined contours produced. Their ability to make very precise cuts is particularly appreciated. Their special cutting edge shape significantly reduces burr formation, which saves on reworking. The possible applications are extremely versatile, as parting steels are compatible with numerous materials such as steel, stainless steel, aluminium and even plastics.

Types of cut-off steel

Cut-off steels are available in different variants that differ in terms of structure, cutting technology and material. Different types can be selected depending on the application and machine.

Cut-off steel with cutting plate

A parting-off tool with cutting insert consists of a base body and an inserted cutting insert, which is usually made of carbide. This cutting insert can be replaced when worn without having to replace the entire tool. This makes this variant particularly durable and efficient. Due to these advantages, the parting-off tool with cutting insert is preferred in CNC machining, where fast changeover times and consistent quality are required.

HSS (High-Speed Steel) parting-off steel

A cut-off steel made from HSS, i.e. high-speed steel, is primarily used in the manual sector and for smaller series production. HSS is characterised by high toughness and good resharpenability. It is particularly valued when machining softer materials such as aluminium, brass or plastics. HSS cut-off steels are affordable to purchase and can be easily resharpened several times. This makes them flexible to use.

Cut-off steel with indexable insert

Cut-off steels with an indexable insert have a double-sided cutting edge that can be easily reversed when worn. This allows both sides of the cutting edge to be used, which significantly extends the service life of the tool. Handling is simple and the inserts are usually made of carbide.

What should you look out for when buying?

When buying a parting tool, it is important to consider several factors. Firstly, the material of the workpiece to be machined plays a very important role. While carbide offers clear advantages when machining steel and stainless steel, HSS is particularly suitable for softer materials such as aluminium or plastic. The type of machine - whether CNC or manual lathe - also influences the choice of the right cutting steel. Equally relevant are the desired cutting width and depth as well as the possibility of an efficient coolant supply, especially at high cutting speeds. Anyone working with large quantities should consider an interchangeable insert system in order to minimise set-up times and increase productivity.

Conclusion: The right parting-off tool for every application

Whether parting-off steel with a cutting insert, made of HSS or with an indexable insert - there is a suitable design for every application and type of machining. The decision should always be made depending on the material being processed, the machine type and the production volume. Modern systems with interchangeable or indexable inserts offer a particularly high level of flexibility. HSS cut-off steels are particularly impressive for single operations due to their favourable acquisition costs and the possibility of resharpening. Anyone who attaches great importance to efficiency, repeat accuracy and short changeover times is best advised to use a parting-off tool with a cutting or indexable insert.

Frequently asked questions (FAQ)

Many people ask themselves whether HSS or carbide is the better choice. The answer depends on the application. Carbide is significantly more wear-resistant and heat-resistant, while HSS is cheaper and can be resharpened - making it ideal for softer materials and smaller production quantities. The question of whether cut-off steels can be resharpened is also justified. While HSS cut-off steels can be resharpened without any problems, this is generally not possible with carbide cutting inserts. These are simply replaced when worn.

How to set your parting steel correctly

As it is important that the cutting edge is set to the correct height when working with parting-off tools, our guide will be happy to help you set your parting-off tool correctly.