Page 76 - 《橡塑技术与装备》英文版2026年3期

HINA R&P TECHNOLOGY AND EQUIPMENT

N—The number of wire winding leads in this layer; in the tires, leading to an increase in tire internal pressure and a
θ—The angle of axial rotation of the steel wire wrapped corresponding doubling of the tensile stress borne by the steel
around the steel wire coil core, with one lead of external steel bead ring.
wire winding; The use of finite element analysis method can fully
M—The number of steel wires wound in the cross-section verify that the stress distribution within the cross-section of the
after winding this layer. circular steel wire bead is in the form of concentric rings. The
Equations (1) and (2) are the parametric equations for the stress distribution gradually increases from the inner core of the
circular bead wire winding machine. To form the first layer of steel wire bead to the outermost steel wire, and the maximum
outer bead wire as shown in figure 3, the lead setting is set to stress is located at the contact area between the tire bead and
N=6 (the larger the lead setting value, the greater and uneven the rim. However, compared with the stress performance of
the stress on the bead wire; the smaller the lead number, the the hexagonal steel wire bead, the stress variation rate of the
better the mechanical properties, but too small a lead can cause circular steel wire bead and its bottom rubber is smaller than
separation between the bead wires. The value for circular bead that of the hexagonal steel wire bead, with no obvious stress
wires in aviation tires is generally between 5 and 8). In the concentration points, indicating a more optimized structural
figure, M=13, which allows us to obtain the values of α and stress distribution.
θ. Based on these parameters, the winding direction is set,
and the circular bead wire winding machine can wind the first 2 Selection of circular wire rings
layer of outer bead wire as shown in figure 3, and it can also Currently, there is no national standard for round steel
automatically cut and splice. The second and third layers can wire rings. GB/T 14450-2016 "Steel Wire for Bead" stipulates
be similarly wound. the classification code, dimensions, shape, weight, ordering
1.3 Mechanical properties of circular steel content, test methods, inspection rules, etc. of tempered
wire rings steel wire for automobile tire beads. This article cites some
The force exerted on the circular steel bead ring primarily commonly used specifications of round cross-section steel
manifests as tensile stress, with over 70% of the load stemming wire rings produced by Otto Kuhlmann Automotive Systems
from inflation pressure. Particularly during the landing process Components GmbH in Germany, as shown in Table 1:
of aircraft tires, impact loads induce 30% to 50% deformation

Table 1 Some commonly used specifications of round wire rings
Serial number Specifications Minimum theoretical breaking force (KN) Diameter (mm)
1 1×5+(13+19+25)×1.5 196.95 14.00
2 1×3+(7+13+20)×2 239.34 15.00
3 1×5+(10+16+22)×2 290.36 17.00
4 1×6+(11+17+23)×2 311.50 18.00
5 1×6+(11+17+23)×2.2 375.00 19.20
6 1×5+(11+17+23+29)×1.8 393.26 19.40
7 1×5+(10+16+22+28)×2 459.20 21.00
8 1×6+(11+17+23+30)×2 492.40 22.00
9 1×5+(10+16+22+28)×2.2 554.45 22.60
10 1×5+(11+17+23+29+35)×1.8 564.41 23.00
11 1×5+(13+19+25+31+37+41)×1.5 570.17 23.00
12 1×6+(11+17+23+29+35)×2 697.42 26.00

2.1 Selection of circular bead wire core and treatment. The surface of the steel wire is plated with low-tin
steel wire material bronze or high-tin bronze, with the plating thickness controlled
The core of the bead wire and the outer wrapped steel at 0.12±0.07 mm. The factory specifies that the adhesive
wire are both made of high-strength, high-quality carbon force between a 1 mm diameter steel wire and the adhesive
structural steel, which undergoes high-temperature tempering is not less than 685 N. The core of the bead wire is required

·30· Vol.52，No.3