CHS Spring continuously refines the cross-sectional dimensions and design parameters of rectangular springs to enhance their durability. To ensure safe usage and prevent issues caused by improper handling, please follow the guidelines below.
**CHS Spring Usage and Safety Precautions**
CHS Spring is constantly improving its rectangular spring designs to increase longevity and reliability. To avoid damage or malfunction due to incorrect use, please pay close attention to the following recommendations.
1. **No Guide Shaft for Springs**
Using a spring without a guide shaft can lead to severe bending or deformation, ultimately causing the spring to break and potentially damaging the device. It is highly recommended to use an inner diameter guide pin for stability.
2. **Spring Inner Diameter vs. Guide Shaft**
The spring’s inner diameter should be approximately 1.0 mm larger than the guide shaft. If the clearance is too small, the spring may wear out quickly; if it's too large, the spring may bend and fail prematurely.
3. **Spring Outer Diameter vs. Counterbore**
The outer diameter of the spring should be about 1.5 mm smaller than the counterbore. A tight fit can restrict the spring during compression, leading to early failure. Ensure proper clearance to allow smooth operation.
4. **Short Guide Shaft and Counterbore Depth**
The guide shaft length should be at least half of the spring’s initial length. A short guide shaft increases the risk of the spring colliding with the end, causing premature breakage. Chamfering the front end of the guide shaft can help reduce this risk.
5. **Exceeding Standard Use**
Using the spring beyond its rated service life or exceeding the maximum compression can generate unsafe stress levels, leading to fractures or deformation. Always follow the specifications provided in the catalog.
6. **No Preloading**
Without preloading, the spring may move up and down, creating impact forces that can damage the spring. Preload the spring according to its free length to ensure stable and safe operation.
7. **Foreign Objects and Scrap**
Avoid mixing foreign objects or scrap into the spring’s operating area. These can reduce the available space and cause abnormal shearing forces on the spring wire, leading to early failure.
8. **Poor Parallelism of Mounting Surface**
If the mounting surface is not parallel, the spring may tilt, causing uneven stress distribution and early breakage. Ensure the mounting surface is flat and aligned properly.
9. **Using Springs in Series**
When springs are used in series, each spring may experience different loads, increasing the risk of deformation or failure. This configuration should be avoided unless carefully designed.
10. **Spring Sleeves**
Using spring sleeves can cause misalignment between inner and outer springs, resulting in collisions, squeezing, and premature damage. Consider alternative designs if necessary.
**Operating Temperature**
The catalog specifies the standard performance of the spring at 25°C. At 80°C, performance remains relatively stable under normal conditions. However, prolonged exposure to high temperatures can reduce durability, stiffness, and free length.
**Main Conditions That Increase Temperature and Reduce Durability:**
- Excessive initial compression with long retention time
- High-speed operation
- Large stroke (difference between initial and maximum compression)
Under these conditions, maintenance should be performed before the service life indicated in the catalog expires.
**Heat Resistance**
The heat resistance of the spring is lower than that of the wire material: 120°C for round wire and 220°C for rectangular wire.
**Compression Use**
Always operate within the maximum compression limits. Exceeding this range can significantly reduce lifespan, stiffness, and may cause breakage. Avoid using near the press-fit length, and adjust load or free length if necessary.
When used in a compressed state, the free length or stiffness may decrease, reducing overall performance and lifespan. In stamping dies, springs are often used in areas like discharge screws, floating pins, and material rods. Designers must consider installation space, load capacity, and expected service life when selecting springs.
**Installation Tips:**
1. Prioritize installation space when choosing the most suitable load specification.
2. Based on the required load, select the best spring size that fits the available space.
Click for more information:
ISO standard mold spring | JIS standard high compression mold spring | JIS standard heavy load mold spring | Round wire mold spring | Non-standard custom spring (corrosion-resistant spring)
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