Degradation Processes in the Contact Layers of Forming Tools

Abstract

The article deals with cyclical abrasive wear of the surface of forming tools. At this stage the research focused on the genesis of stress in the contact between a deformed material and a tool in the cold bulk forming process. The experiments were conducted in the simple configuration of the upsetting test. The article presents the results of abrasive wear by a combination of materials of examined samples and upsetting plates. The abrasive wear in the used material specimens was analysed comparatively in the form of the wear factor by the finite element method. Two intersecting phenomenological fields represent the output for the examined material combinations. Firstly, it is a formulation of the dependencies of the maximum depth increase of the surface wear. The argument is the number of exposure cycles. At the same time, the topology of degradations and the resulting roughness in the space of the exposed surface were examined.

An Impact of Technological Conditions on Surface Burning in Grinding of the Orbit

“…The record is made and in case the burning takes place in selected samples, no further production is allowed. Maintenance is informed immediately and the machine by which the samples were produced is stopped until measures are taken to remove a burning from the orbital path surface [13,15,3].…”

Influence of Selected Cutting Conditions on Cutting Forces

“…It determines also rotational moment of spindle. Theory shows that as the end cutting edge angle increases, cutting force Fc decreases and its size relates also to cut width b [13,14]. When the tool SNMG is applied, bigger cut width and also bigger cutting force are evident.…”