In the metalworking industry, a variety of rolling techniques are used to shape sheet or metal plate into the desired form. Among these techniques, the most common are conical rolling and cylindrical rolling. Both methods have different application areas and show significant differences in terms of technical principles and the results achieved. At DMK Makina, we offer solutions that deliver high precision and efficiency in both rolling techniques.

What Is Cylindrical Rolling?

Cylindrical rolling is the process of bending a metal sheet around a straight axis to obtain a cylindrical shape. This process is generally carried out using three-roll or four-roll rolling machines. As the metal sheet passes between the rolls, the pressure applied and the movement of the rolls bend it to the desired radius. Cylindrical rolling is widely used in many industrial applications such as tank manufacturing, pipe production and boiler manufacturing.

The basic principle of cylindrical rolling is to exceed the metal's elastic limit so that it undergoes permanent deformation. For this reason, the material's properties and thickness must be taken into account during the rolling process. DMK Makina's cylindrical rolling machines are optimized for different metal types and thicknesses, offering high precision and repeatability.

What Is Conical Rolling?

Conical rolling is the process of bending a metal sheet into a cone shape. Unlike cylindrical rolling, in conical rolling the bending axis is not straight but angled. For this reason, conical rolling is a more complex process and may require specialized equipment. Conical rolling is used in applications such as conical tanks, hoppers and transition pieces.

In conical rolling, different amounts of pressure need to be applied to different regions of the metal sheet. This is typically achieved using specially designed rolls or dies. DMK Makina offers specialized solutions for conical rolling, meeting our customers' complex forming needs.

Key Differences Between Conical and Cylindrical Rolling

The most fundamental difference between conical and cylindrical rolling is the geometric shape obtained. Cylindrical rolling produces a uniform cylinder, while conical rolling produces a conical shape. This difference also affects the technical principles of the rolling process and the equipment used.

Here are some of the key differences between the two methods:

  • Axis Curvature: In cylindrical rolling, the bending axis is straight; in conical rolling, it is angled.
  • Pressure Distribution: In cylindrical rolling, pressure is generally distributed evenly along the sheet; in conical rolling, different pressures are applied to different regions.
  • Equipment Requirements: Standard rolling machines may be sufficient for cylindrical rolling, while conical rolling may require specialized rolls or dies.
  • Application Areas: Cylindrical rolling has a broader range of applications (tanks, pipes, boilers, etc.), while conical rolling is used in more specialized applications (conical tanks, hoppers, transition pieces, etc.).

Choosing Between the Two: What to Consider

When deciding between conical and cylindrical rolling for a project, the starting point should always be the end geometry required by the drawing — this isn't usually a matter of preference. Where there is a choice, however, a few practical considerations help: conical parts generally require more setup time and calibration passes than cylindrical ones of similar size, since the varying radius along the part's length means springback compensation isn't constant across the piece. This makes conical rolling somewhat less economical at very low quantities unless the part geometry specifically demands it. For transition pieces that combine a cylindrical section with a conical section, planning the two rolling operations together — rather than as separate jobs — helps keep the weld seam between them aligned and consistent.

DMK Makina's Rolling Solutions

At DMK Makina, drawing on our many years of experience in the metalworking sector, we offer high-quality, reliable solutions for both cylindrical and conical rolling. Our rolling machines, custom-designed to meet our customers' needs, provide high precision, efficiency and repeatability.

Our machines are optimized for different metal types and thicknesses, and can be easily programmed and managed thanks to their user-friendly interfaces and advanced control systems. We are also always by our customers' side with our technical service and spare parts support.

For your conical and cylindrical rolling needs, get in touch with DMK Makina to receive detailed information and custom solutions from our expert team.