Application scope:
This standard specifies the technical requirements, test methods, inspection rules and signs for cylindrical spiral springs (hereinafter referred to as springs) for locomotive and vehicle brakes.
This standard applies to new refrigeration coil compression springs for circular cross-section (cross-section diameter (0.5-12mm)) of dry rolling stock brakes.
Spring characteristics and limit deviation meet the requirements:
1. The load at the specified height shall be measured between 20% and 80% of the spring deformation at the time of the test load. 2. The spring stiffness shall be between 30% and 70% of the deformation under the test load.
3. The limit deviation of the load (p) at the specified height is shown in Table 1.
Level I
Grade II
Grade III
≥3-10
±0.05P
±0.10P
±0.15P
>10
±0.04P
±0.08P
±0.12P
Table 1
4. The allowable deviation of the spring stiffness P1 is shown in Table 2. The spring stiffness test is only carried out when the requirements of the drawings specify this requirement.
Level I
Grade II
Grade III
≥3-10
±0.08P1
±0.12P1
±0.15P1
>10
±0.07P1
±0.10P1
±0.12P1
Table 2
5. After the spring is compressed three times under the test load, no permanent deformation is allowed.
6, the spring surface out according to the product design or related technical documents.
Spring property test:
1. The spring characteristic is measured by compressing the spring once to the metal phase after the test load Pa. At this time, the test load is calculated according to the test stress T1 specified in Table 3, when the test load is greater than the load Pb, Pressure and load are used as test loads.
material
Carbon spring wire
Oil quenched and tempered carbon spring wire
Valve oil quenched and tempered carbon spring wire
Si-Mn spring steel wire
Test stress Lz
Tensile strength*0.5
Tensile strength *0.55
Tensile strength *0.55
740
Test load calculation formula:
PS=(Ï€d^3/8D)L
In the formula:
PS—The test load L—the stress d under the test load—the material diameter D—the load in the spring and the specified height, and the test height is determined according to the product drawing. Load grouping springs should be tested according to the grouping.
3. The value of the spring stiffness is determined according to the ratio of any two points of load difference and deformation amount between 30% and 70% of the deformation amount under test load.
For more details, please contact: Jinan Zhongchuang Industrial Test System Co., Ltd.
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