Stein 2 – Investigation of the Relationships Between the Properties, Grinding Processes, and Application Behavior of Stones as Cutting Material

The industrial toolmaking sector is highly dependent on critical raw materials such as tungsten and cobalt. These materials are expensive, energy-intensive to produce, and subject to geopolitical risks. At the same time, the demand for sustainable manufacturing processes is increasing. Initial studies show that certain types of stone, such as flint and quartzite, exhibit high hardness and favorable wear resistance despite their natural origin. Through targeted grinding and heat treatment processes, these properties can be further optimized. Systematic investigation of these potentials enables companies to develop new, resource-efficient tool solutions.

Objectives

The project aims to scientifically and technically qualify natural stones as alternative cutting materials. To this end, material behavior, machinability, and cutting performance are systematically investigated. Advantages / Practical Benefits:

• Substitution of critical raw materials (W, Co)
• Reduced material and energy costs
• Sustainable tool options for industry and crafts
• Expansion of the material portfolio for manufacturers
• Foundation for new business models in toolmaking and recycling

Benefits

Sustainable, cost-effective, and resource-independent cutting materials through the targeted utilization and modification of natural stones for industrial tooling applications.

Approach

The project integrates material characterization, process analysis, and application testing. The focus is on studying the grinding mechanisms and fracture behavior of various stones, as well as performing heat treatments to tailor their properties. Based on these insights, optimized grinding and preparation processes are developed and tested in real machining applications with metals, wood, and polymers. Partners from material science, manufacturing technology, and industry are involved.

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Contact Lucas Marra via email at marra@ifw.uni-hannover.de or by phone at  +49 511 762 18383.