Hexagonal profile steel cold-drawing mould

Abstract

The invention relates to a cold-drawing mould and particularly relates to a hexagonal profile steel cold-drawing mould for manufacturing hexagonal profile steel. The hexagonal profile steel cold-drawing mould comprises a body, wherein the body is provided with a through hole; the through hole is provided with an inlet region, a lubricating region, a deformation region, a sizing region and an outlet region in sequence from one end to the other end. The cross sections of the inlet region, the lubricating region, the deformation region, the sizing region and the outlet region are hexagonal. The hexagonal profile steel cold-drawing mould is characterized in that the cross section of the sizing region is similar to the hexagonal shape; each edge of the cross section of the deformation region is in a circular-arc shape which is concave to the center of the through hole; a surface corresponding to each edge of the cross section of the deformation region is a deformation surface; the vertical section of the deformation surface is also in a circular-arc shape which is concave to the center of the through hole. The hexagonal profile steel cold-drawing mould is good for filling corners of the hexagonal profile steel; the needed hexagonal profile steel can be drawn by using a smaller circular blank so that the use specification of raw materials is reduced, the drawing frequency is reduced and the processing cost is reduced; meanwhile, the possibility of generating cracks in the corners of the finished-product hexagonal profile steel is reduced.

Description

technical field [0001] The invention relates to a cold drawing die, in particular to a hexagonal steel cold drawing die for making hexagonal steel. Background technique [0002] Cold drawing processing is a metal processing method that acts on one end of the raw material with an external force under normal temperature conditions to make it pass through the cold drawing die, so that the cross section of the raw material is reduced and the length is increased. Products processed by cold drawing have the advantages of high dimensional accuracy and superior mechanical properties. Cold drawing is widely used in various industries. [0003] During the cold drawing process, the cold drawing die is a tool that directly contacts the raw material to deform it. The design of the cold drawing die directly affects the quality of the cold drawn steel and the production cost. In the industry, due to the influence of raw material production, hexagonal steel usually uses hot-rolled round s...

AI Technical Summary

Problems solved by technology

Each deformation surface of this type of mold is flat. In the process of cold drawing of round steel into hexagonal steel, the metal only extends in the longitudinal direction, and almost does not produce lateral expansion, so that the corners of the hexagonal steel are not easy to fill completely.

In order to fill the corners completely, according to the principle of tolerance, it is necessary to choose a relatively large round steel. At the same time, due to the influence of the tensile coefficient of the round steel, it is also necessary to increase the number of drawing times. The increase in the number of drawing times increases the processing cost.

In addition, since parameters such as the pulling force and tensile coefficient need to be determined for each drawing, the setting errors of these parameters are likely to cause cracks at the corners of the finished hexagonal steel, thereby increasing the probability of defective products

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