Sunshine Industry has investigated that the term feed machinery has become more and more popular recently, and many people have invested in this industry. For many buyers, it is not clear how the number of holes in the ring die should be determined, nor the impact of the number of holes in the ring die on output. Come and let us take a look today.

To determine the number of holes in the ring mold, you first need to know the working area of the ring mold, the arrangement of the holes, and the opening ratio.

Ring die working area, hole arrangement and hole opening ratio

The working area of the ring die refers to the product of the inner diameter circumference of the ring die and the effective width. The effective width refers to the distance between the two over-travel grooves of the ring die. Under the same working area, the inner diameter of the ring die is inversely proportional to the effective width.

The arrangement when drilling the ring die is generally arranged in the circumferential direction, and the small holes between rows are staggered in the width direction, so that the entire drilled small holes are arranged in an approximately equilateral triangle. If the diameter of the small hole is d, the wall thickness between the small holes is a, and the opening rate of the ring die is ψ, then according to the equilateral triangle principle, it is not difficult to calculate: ψ≈0.9d2/(d+a )2

For example, for a ring die with a hole diameter of 4.5mm, if the wall thickness between the holes is 2.6mm, the ring die opening rate can be calculated to be 36%.

It can be seen from the above formula that when the diameter of the die hole is constant, in order to improve the opening rate of the ring die, the wall thickness between the die holes must be reduced, but the minimum wall thickness must meet the strength of the ring die.

The general rule is that the larger the die hole diameter, the higher the ring die opening rate.

Therefore, the number of holes in the ring mold needs to be determined based on so many elements. Have you learned it?

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