The article is a continuation of the previous authors’ works in the framework of the wet drawing study. The process of wet superthin and extra-thinest drawing of brass-plated steel wire is considered in order to increase the wear resistance of dies. The analysis of various types of drawing tools (hard-alloy dies, synthetic diamond dies, natural diamond dies) was carried out for the relevance of its application for drawing wire of small diameters. Classification of the components of operational durability of the drawing tool is given. A description of the research methodology is given, including the procedure and conditions for conducting measurements, the industrial equipment used to obtain the initial data, as well as the type of drawbench (drawing machine). The paper presents a comparative analysis of the data obtained with the results of studies by other authors obtained for a similar drawing tool. The main characteristics of the wear resistance distribution (asymmetry, kurtosis, coefficient of variation) are calculated. Based on the statistical analysis of an array of experimental data for a sample of more than 500 samples, a high correlation of the wear resistance of dies with the criterion of the safety coefficient and a weak correlation with the criteria of the drawing force and stress were revealed. It is shown that the optimal, i.e., the highest and most stable results on the drawing tool wear resistance are achieved with the values of the safety coefficient in the range from 1.9 to 2.5. A formula is proposed for determining the value of the safety factor depending on the wire diameter, which provides the maximum values of tool wear resistance along the drawing schedule. The results obtained are recommended for use in the design of new wet drawing schedules using synthetic diamond dies.

The paper continues the previous authors’ works in the field of wet wire drawing. The process of wet fine brass-plated steel wire drawing is considered. The subject of the paper is increase of the wire die wearability. The analysis of various wire drawing tools (hard alloy dies, synthetic diamond dies, natural diamond dies) was carried out for the relevance of its application for small diameter wire drawing. The authors studied the wire die wearability. The research methodology is presented, which include the procedure and conditions for measurements, industrial equipment and type of wire drawing machine. In the paper, the comparative analysis of the experimental data with the results of other authors for similar wire drawing tool was carried out. The authors calculated the main characteristics of the wire die wearability distribution (asymmetry, kurtosis, coefficient of variation). A statistical analysis of the array of experimental data for selection of more than 500 samples was performed. A high correlation of the drawing die wearability with the ratio of breaking stress to draw stress and a weak correlation with the drawing force and stress were revealed. The highest and most stable die life results are achieved when ratio of breaking stress to draw stress has values of 1.9 – 2.5. A formula was proposed for determining the optimal value of the ratio of breaking stress to draw stress, depending on the wire diameter. The formula allows one to determine the maximum die wearability values, depending on the wire drawing schedule. The work results can be used when designing new wet wire drawing schedules using synthetic diamond dies.

A simulation of the process compression wires of two adjacent layers of the strand, the factors that affect the curvature, width and shape of the contact surface wires during compression strand.

This article examines a competitive new technology that was recently introduced for obtaining thin rolled reinforcement bars by multi-cyclic deformation in the tension – alternating bending regime. Experimental results from use of the technology on low-carbon reinforcement-grade wire rod are found to agree with a model that was constructed to describe the process. It is shown analytically and experimentally that by controlling the main factors in the process – tension, the ratio of the radius of the bending roller to the radius of the wire, and the angle of grip of the wire by the roller – it is possible to obtain different strength/ductility ratios in reinforcement steel. This makes practical use of the new technology very promising.

Mathematical modeling is used to study how drawing speed affects the temperature-deformation conditions on the pulleys used on drawbenches. It is shown that these conditions have a significant effect on the regimes used in the high-speed wet drawing of wire. The pulleys can function either as an additional heat source and raise the temperature of the wire or absorb heat and lower the wire’s temperature, depending on the amount of slip that takes place in them. Failure to account for the temperature-deformation conditions on the pulleys leads to a sizable error in calculations of the temperature regimes for wet drawing.