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Irregularly shaped sealing rings (non-standard shapes such as rectangular, L-shaped, etc.) typically rely on manual trimming due to their soft material or complex structure. The reasons are as follows: 1.Material Softness and Deformation Susceptibility Material Properties: Soft materials like rubber or silicone have high elasticity, making them prone to deformation or damage under mechanical clamping or cutting forces during machine trimming, compromising geometric precision. Manual Advantage: Human operators can dynamically sense material conditions and adjust pressure and angle to avoid overexertion, ensuring edge flatness. 2.Complex Geometry and Poor Adaptability Non-standard Contours: Irregular sealing rings often feature curves, angled edges, or intricate structures that are challenging for generic machinery (e.g., laser cutters, stamping dies) to precisely replicate. Custom fixtures or repeated adjustments are costly. Manual Flexibility: Workers can directly trim using hand tools to match actual shapes, offering strong adaptability, especially for small batches or prototypes. 3.Precision and Surface Quality Requirements Tight Tolerances: Sealing rings require minimal clearance with mating components (e.g., hydraulic systems). Machine cutting may introduce burrs or micro-errors, while manual trimming allows fine finishing via sandpaper or files to enhance surface smoothness. Stress-Free Processing: Mechanical methods may induce residual internal stress, whereas manual operations reduce molecular chain damage, prolonging service life. 4. Cost-Efficiency Trade-offs Low-Volume Production: For small batches, custom automation is uneconomical, making manual trimming more practical. Rapid Adjustments: Manual processes enable immediate defect correction (e.g., flash, material defects) based on quality inspections, minimizing rework waste. 5. Specialized Process Requirements Thermal Trimming Limitations: Some soft materials require low-temperature or solvent-assisted softening for trimming, where manual control ensures safety and precision. Seam Handling: For sealing rings with bonded joints, manual trimming and sanding are necessary to ensure flat, void-free bonding surfaces. Alternative Solutions Precision Molds: For high-volume production with fixed shapes, custom molds can reduce post-trimming needs. Laser Cutting: Suitable for harder materials or simple irregular shapes, though soft materials may suffer from thermal degradation at edges. Semi-Automated Systems: Pneumatic trimming machines paired with flexible fixtures balance efficiency and precision but still require manual assistance. Summary Manual trimming remains the preferred method for soft irregular sealing rings, balancing material behavior, cost, and quality—particularly in low-volume, high-precision scenarios. However, advancements in flexible manufacturing (e.g., vision-guided robotic trimming) may reduce reliance on manual processes in the future.

Silicone sealing ring is a kind of sealing ring, which is made of various silica gel as raw materials for fixing the ring cover, so that it can be fitted with the gap between the ring or the washer on the bearing, and the sealing ring made of other materials has more excellent performance in preventing water or oil leakage. At present, it is mainly used for waterproof sealing and preservation of daily supplies such as fresh-keeping box, rice cooker, drinking machine, lunch box, insulated box, fresh-keeping box, water cup, oven, magnetized cup, coffee pot, etc. It is convenient to use, safe and environmental protection, and is deeply loved by everyone. So today, let’s take a look at the silicone sealing ring. (Silicone sealing ring) (ordinary rubber sealing ring) 1.Excellent weather resistance Weather resistance refers to the influence of direct sunlight, temperature changes, wind and rain and other external conditions, and a series of aging phenomena such as fading, discoloration, cracking, powder and strength decline, ultraviolet irradiation is the main factor to promote the aging of products. Si-O-Si bond in silicone rubber is very stable to oxygen, ozone and ultraviolet rays, and has excellent resistance to ozone and oxide erosion. In the absence of any additives, it has excellent weather resistance, and does not crack even if it is used outdoors for a long time. It is generally believed that silicone rubber seals can be used outdoors for more than 20 years. 2.Material safety and environmental protection Silicone rubber has its unique physiological inertia, non-toxic, tasteless, no smell, good preservation effect, and less interference by the external environment, long-term use unchanged yellow, do not fade. And in line with the national food and medical health standards, mostly used in food, medicine, aluminum silver pulp and various oils filtration and impurity removal. 3.Good electrical insulation performance Organic silicone has excellent electrical insulation properties, corona resistance (can resist quality declination) and arc resistance (resistance to deterioration caused by high voltage arc action) is also very good. 4.High permeability and selectivity of gas transmission Because the molecular structure of silica gel makes the silicone sealing ring have good permeability and good selectivity for gas, the permeability of silicone rubber to air, nitrogen, oxygen, carbon dioxide and other gases at room temperature is 30-50 times higher than that of natural rubber. 5.Hygroscopic performance The surface energy of the silica gel ring is low, which has the absorption function of water in the environment and plays the role of isolation. 6.Wide range of high and low temperature resistance High temperature resistance: silicone sealing ring compared with ordinary rubber has better heat resistance, can be heated under high temperature without deformation without harmful substances. It can be used almost forever at 150 ° C without performance changes, can be used continuously for 10,000 hours at 200 ° C, and can be used for a period of time at 350 ° C. Widely used in applications requiring heat resistance, such as: hot water bottle sealing ring. Low temperature resistance: ordinary rubber -20 ° C ~ -30 ° C will become hardened and brittle, while silicone rubber still has good elasticity at -60 ° C ~ -70 ° C, some special formulations of silicone rubber can also withstand more harsh extremely low temperatures, such as: low temperature sealing rings, the lowest can reach -100 ° C. 7.High permeability and selectivity of gas transmission Because the molecular structure of silica gel makes the silicone sealing ring have good permeability and good selectivity for gas, the permeability of silicone rubber to air, nitrogen, oxygen, carbon dioxide and other gases at room temperature is 30-50 times higher than that of natural rubber. Disadvantages of silicone rubber sealing ring Tensile strength and tear strength mechanical properties are poor For stretching, tearing, and strong wear in the working environment, it is not recommended to use silicone seals, which are usually only used for static sealing. Although silicone rubber is compatible with most oils, compounds and solvents, it has good acid and alkaline resistance, but it has no resistance to alkane, hydrogen and aromatic oils. Therefore, it is not suitable for use in an environment with a working pressure of more than 50 pounds. In addition, it is not recommended to use silicone seals in most concentrated solvents, oils, concentrated acids and diluted caustic soda solutions. The price is relative to other materials, silicone sealing rubber ring, the manufacturing cost is relatively high.