End mill

An end mill for milling composite materials, having a defined rotating direction, a shank and a cutting part, the cutting part extending from a shank-side end up to a frontal end, the cutting part comprising a front length region and a rear length region, the front length region extending from the frontal end toward the shank-side end, the rear length region extending from the shank-side end toward the frontal end, wherein:

• the front length region has a plurality of first circumferential cutters running with a positive helix angle, each of which adjoins at least one first groove, each first groove running with a positive helix angle,
• the rear length region has a plurality of second circumferential cutters running with a negative helix angle, each of which adjoins at least one second groove, each second groove running with a negative helix angle,
• at least a part of the first circumferential cutters in the front length region are each divided into cutting segments,
• at least a part of the second circumferential cutters in the rear length region are each divided into cutting segments,
• each of the at least one first groove extends into the rear length region at least up to the shank-side end of the cutting part,
• each of the at least one second groove extends into the front length region at least up to the frontal end of the cutting part,
• each of the at least one first groove is wider and/or deeper in the front length region than in the rear length region, and
• each of the at least one second groove is wider and/or deeper in the rear length region than in the front length region.