Selection of Drawing Tool Geometry

Impol has an extensive production programme of quality semi-finished products made from aluminium and aluminium alloys. According to technological criteria, these are divided into casting alloys and wrought or forming alloys. The diploma thesis presents the ** production programme** and ** forming processes** with emphasis on extrusion processes and ** drawing of bars from aluminium alloys**. Based on the analysis of drawing test results, it was established that for drawing alloys of the 7022, 7055 (AlZnMg) and 2007 (AlCu) groups with a drawing tool with a cylinder length of 5 mm, the appropriate maximum value of the drawing angle (α) is 3°, whilst for alloys of the 6000 group (AlMgSi) the drawing angle can be larger, namely from 4°–6°.

Problem

Impol has an extensive production programme of quality semi-finished products made from aluminium and aluminium alloys. According to technological criteria, these are divided into casting alloys and wrought or forming alloys. The group of wrought alloys also includes certain alloys intended for ** production of drawn bars**.

Solution and Method

The diploma thesis presents the production programme and ** forming processes** with emphasis on extrusion processes and ** drawing of bars from aluminium alloys. Good formability ensures that wrought or drawing alloys achieve the required ** deformation state and mechanical properties. In hot and/or cold forming processes, the ** shape, dimensions and mechanical properties** of the workpiece are permanently changed, whilst individual technological operations take place in a specific, predetermined sequence.

The entire technological sequence is presented – from preparation of input raw material in the form of cast billets of various dimensions, heat treatment, extrusion process to drawing of bars on a combined drawing line. This is followed by straightening and cutting of drawn bars to final length. The problem of selecting appropriate drawing tool geometry is highlighted, which will ensure the required ** dimensional accuracy** within the required h9 tolerances and quality surface for drawn bars with diameters from Ø 15.00 mm to Ø 32.00 mm inclusive.

Basic tool selection criteria are provided, such as: type and hardness of alloy, type of tool and drawing angle of tool, tool dimension, degree of deformation according to required final dimension and tolerance.

Results

Based on the analysis of drawing test results, it was established that for drawing alloys of the 7022, 7055 (AlZnMg) and 2007 (AlCu) groups with a drawing tool with a cylinder length of 5 mm, the appropriate maximum value of the drawing angle (α) is 3°, whilst for alloys of the 6000 group (AlMgSi) the drawing angle can be larger, namely from 4°–6°.