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Spiral springs are widely used in both small and large-scale industrial applications. They are essentially springs made of a coiled wire, either in a flat spiral or helix shape. They are also referred to as "Power springs" or "Flat spiral springs".
STRUCTURE OF SPIRAL SPRINGS:A spiral spring is composed of a thin strip with a rectangular cross-section, wound in a spiral shape. The inner end of the wound strip is fixed to the center arbor, while the outer end is clamped to the retaining drum. When the arbor rotates, the spring winds up.
WORKING PRINCIPLE:
As the arbor rotates, the spring winds up, storing energy in the process. This stored energy is then released as mechanical torque through the drum when the spring unwinds due to rotation. The strip used in spiral springs is made of high-quality steel. Its thinness allows for high flexibility, enabling the arbor to have a larger angular deflection. In many applications, the arbor's angular deflection can span several dozen revolutions, resulting in the storage of a significant amount of energy. In many cases, the drum is integrated with a gear. The energy released by the rotation of this gear is then transferred to another gear, which drives a specific mechanism.
Parameters:
The given problem involves a flat spiral spring subjected to a maximum torque of 12000 N-mm. The spring, made of a steel strip, must ensure that the maximum bending stress does not exceed 800 N/mm2. As the stress in the spring decreases from 800 N/mm2 to 0 N/mm2, the arbor turns down three complete revolutions with respect to the drum. The thickness of the steel strip is 1.25 mm, and the modulus of elasticity is 207000 N/mm2. Determine the width and length of the steel strip.
Quality control during the spiralspring production process mainly includes the following aspects:
Material selection: The material of the spiral spring needs to have good elasticity and toughness to ensure the durability and stability of the spring. Therefore, the selection and inspection of materials during the production process is very important.
Production process: During the production process of spiral springs, parameters such as the size, shape and wire diameter of the spring need to be strictly controlled to ensure the performance and quality of the spring.
Heat treatment: spiral springs usually require heat treatment after production to enhance their elasticity and wear resistance. In this process, parameters such as temperature and time of heat treatment need to be strictly controlled.
Inspection: After the spiral spring is produced, it needs to undergo comprehensive quality inspection, including hardness test, elasticity test, fatigue test, etc., to ensure that the performance of the spring meets the requirements.
Traceability mechanism: In the production process of scroll springs, it is also necessary to establish a complete product traceability mechanism so that when quality problems occur, the causes can be found in time and improvements can be made.
In general, quality control in the spiral spring production process is a comprehensive task, which requires comprehensive control from material selection, production process, heat treatment, testing and traceability to ensure the quality and safety of scroll springs. The performance meets the requirements.
Spiral Spring makes flat coil, power and constant force springs are utilized for medical device and transportation components. They are also used in the Industrial, Durable/Commercial Goods and Electronics markets in a variety of applications:
- Rewind devices
- Office equipment
- Motors
- Generators
- Counterbalances
- Door closers
- Electrical switchgear
- Home décor
- Retracting devices
- Point of purchase displays
