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### SDTH Series Computer - Controlled Spring Testing Machine
The SDTH Series Computer - Controlled Spring Testing Machine is developed in accordance with the national standards for spring testing machines. It features a dedicated control system, data acquisition system, and data - processing system that are entirely automated and intelligent. This machine is capable of testing and analyzing the load, displacement, deformation, stiffness, and free height of various types of springs, including helical springs, disc springs, conical springs, snap springs, combination springs, gas springs, mold springs, and other elastic components.
The design of the machine's main unit and accessories draws on the experience of well - known international brands, resulting in a machine that is not only aesthetically pleasing but also has a high - strength structure with minimal deformation. The main unit is processed by a CNC machining center and has a four - column structure with double - lead screws. The frame is analyzed using finite element analysis to ensure high stiffness and strength. The spring press plates are treated with quenching to guarantee their hardness. Unlike some other machines in the industry that are modified from tensile testing machines (usually with two columns, low stiffness, large deformation, and press plates that are not treated and do not meet the hardness requirements), this machine has a strong structure and high stiffness.
### Main Components and Functional Features
**1.Machine Base** ：The SDTH Series Computer - Controlled Spring Testing Machine is developed in accordance with the national standards for spring testing machines. It features a dedicated control system, data acquisition system, and data - processing system that are entirely automated and intelligent. This machine is capable of testing and analyzing the load, displacement, deformation, stiffness, and free height of various types of springs, including helical springs, disc springs, conical springs, snap springs, combination springs, gas springs, mold springs, and other elastic components.
The design of the machine's main unit and accessories draws on the experience of well - known international brands, resulting in a machine that is not only aesthetically pleasing but also has a high - strength structure with minimal deformation. The main unit is processed by a CNC machining center and has a four - column structure with double - lead screws. The frame is analyzed using finite element analysis to ensure high stiffness and strength. The spring press plates are treated with quenching to guarantee their hardness. Unlike some other machines in the industry that are modified from tensile testing machines (usually with two columns, low stiffness, large deformation, and press plates that are not treated and do not meet the hardness requirements), this machine has a strong structure and high stiffness.
**2.Transmission System** ：The transmission system is composed of a belt - and - pulley speed - reduction system, a planetary gear reducer, precision ball screws, and guide shafts.
**3.Drive System** ：The drive system is equipped with a precision digital AC servo - speed - control system and a servo motor to ensure accurate and reliable operation.
**4.Measurement and Control System** ：The load - measuring control system includes high - precision load cells（with multiple load cells available for springs with larger outer diameters）, measurement amplifiers, A/D converters, and stabilizers. The displacement - measuring control system is equipped with photoelectric encoders, frequency - multiplying and shaping circuits, and counting circuits.
**5.Safety Protection Devices** ：The machine is equipped with an overload protector, a movable crossbar limiting device, over - current and over - voltage protectors, and overspeed protectors to ensure machine safety.
### Testing Standards
The machine conforms to the following testing standards:
**1.** **JB/T 7796** ：**Spring Testing Machine**
**2.** **JJF 1134 - 2005** ：**Calibration Specification for Special - Purpose Working Measurement Machines**
**3.** **GB/T 1972.2 - 2023** ：**Disc Springs - Part 2**
### Disc Spring Load Testing
When measuring the load of disc springs, the test method involves applying pressure between two pressing plates. The hardness of the pressing plates must be greater than that of the disc springs, and they should be ground and polished. Suitable lubricants should be used during the measurement process.
### Fatigue Testing of Disc Springs
Fatigue tests on disc springs are conducted on fatigue testing machines using sinusoidal loadings with constant amplitude. The tests can be performed on single springs or groups of up to 10 springs, with the use of guiding devices that meet the requirements specified in Annex B. The minimum deformation is approximately 0.15 ho to 0.2 ho. The number of cycles is determined according to the alternating stress requirements as shown in Figures 3 to 5. For tests exceeding the scope of Figures 3 to 5, the requirements should be agreed upon by the supplier and the user. If other combination methods are required for fatigue testing, the details should be agreed upon by the supplier and the user.
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