A regular hexagonal drawing die

Abstract

The invention discloses a regular hexagon drawing die. All relevant parameters of an inlet segment of the regular hexagon drawing die can be quantized. The regular hexagon drawing die comprises a drawing die body. The drawing die body is provided with a drawing forming hole which penetrates through the drawing die body. The drawing forming hole comprises the inlet segment and a sizing segment. The sizing segment comprises six flat-straight faces corresponding to six straight sides of a regular hexagon respectively. The distance between each pair of opposite flat-straight faces is a. The inlet segment comprises six leading-in bevels connected with the corresponding flat-straight faces of the sizing segment. Let the distance between the outer edge lines of each pair of opposite leading-in bevels be d1, then d1 is obtained through the formula showed in the specification, and 7.2<=k1<=7.5. The regular hexagon drawing die is used for drawing a circular pipe and a circular bar into a regular hexagon pipe and a regular hexagon bar respectively.

Description

technical field [0001] The invention relates to a drawing die in the technical field of metal plastic processing, in particular to a drawing die for drawing a circular pipe or rod (abbreviated as a drawing die). Background technique [0002] Drawing dies are important tooling components for cold-drawn pipes and rods, and have been widely used in the production process of reducing or / and deforming pipes and rods. Taking steel pipes as an example, the steel pipes are cold-drawn and formed by drawing dies, which have the characteristics of high material utilization, low energy consumption, excellent product performance, high production efficiency, and low cost. Drawing dies can be divided into circular drawing dies and special-shaped drawing dies according to the cross-sectional shape of the drawn pipes; according to whether there is a lining mandrel in the drawing process, they can be divided into empty drawing and drawing dies. Die (referred to as empty drawing die) and lini...

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Problems solved by technology

[0003] As we all know, if the opening size of the drawing die and the length of the entrance section are set unreasonably, the contact area between the pipe and bar and the die will change accordingly, and the longitudinal and lateral flow of the metal will be unbalanced, resulting in The quality of the drawn hexagonal tube or rod is poor, mainly manifested in its poor straightness (with different degrees of bending), uneven wall thickness, unstable size and uneven surface, and even more defects such as drawn Steel pipe breakage and cracking during the process

[0004] At present, there is no uniform design standard for regular hexagonal drawing dies. The length of the entrance section and the size of the opening are set based on experience. For each type of tube and bar, the design must be repeated. The ideal drawing die can only be obtained through repeated tests, improvements, and re-tests, which not only prolongs the processing cycle of the die, but also increases the production cost

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