What is the angle of the wire drawing die

    The angle at the entrance of the inner hole of the wire drawing die is one of the important parameters: it must be ensured that the contact point when the wire enters the die occurs at the same height in the shrinkage area of the wire drawing die, and it must be conducive to the entry of the wire. The entry area of the drawing die provides a smooth profile leading to the lubricated and deformed areas, allowing the lubricant to reach the working surfaces of the drawing die.

The function of the lubricating area is to store lubricant and deliver it to the working area. According to the viscosity of the lubricant, the diameter of the wire and the length of the lubricating area, the cone angle of the lubricating area is different. In order to make the liquid lubricant enter the working area smoothly, the cone angle of the lubricating area should generally choose a larger value. If it is too small, the lubricant should not enter, and the lubricant will not flow, or even form a wedge-shaped blockage in the lubricating area. If the cone angle is too large, it will not be easy to form a hydrodynamic pressure effect. The length of the lubricating area will also affect the lubricating effect. Generally speaking, no matter what kind of lubrication method, the longer the lubricating area, the better the lubricating effect.

The working area is the area where the wire produces plastic deformation, and its dimensional parameters include the working area cone angle a and the working cone length h2. The working cone angle a is the parameter of the wire drawing die.

Its distribution law, the size of the drawing stress and the mechanical properties of the drawn wire play a decisive role.

The cone angle of the working area corresponding to the lowest drawing stress varies with the drawing environment, and there is an optimal range of the cone angle of the working area. When pulling

It is difficult to ensure that the axis of the wire is concentric with the axis of the inner hole of the wire drawing die. In addition, the inner hole of the wire drawing die is worn too much during drawing before, which leads to an increase in the diameter of the wire entering the inner hole. Both of them will cause the wire to deform outside the deformation zone, so work The length of the zone should be greater than the length of the actual deformation zone.

The diameter size of the sizing area is determined according to the allowable tolerance of the wire rod and the elastic deformation of the wire rod during drawing, taking into account the service life of the mold, and the negative tolerance size of the wire rod is usually selected.

The following requirements should be met when determining the length of the sizing area: sufficient wear resistance, energy consumed during drawing, and reduced possibility of breaking the wire. Too long sizing area can improve the life of the wire drawing die, but at the same time, it will also increase the friction, heat generation and energy consumption, and it is easy to cause the reduction of the diameter of the wire or the wire to be broken. If the sizing area is too short, it will cause the wire rod to shake and produce a bamboo shape during drawing, and it will also cause the inner hole of the wire drawing die to wear quickly and cause the size to be out of tolerance. In general, the larger the diameter of the drawn wire, the shorter the length of the sizing zone.

The exit zone forms an included angle of 90 degrees at the drawing die. Such an angle facilitates a specific wider outlet, allowing the die to return to its original size many times without reprocessing. Exit zones are often considered unimportant. However, if the drawing die does not have an exit zone, the trailing edge of the sizing belt will crack or peel off, resulting in damage to the drawing die.

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