Industry Technical Pain Points Opening: Challenges of Precision and Durability in Curling Equipment Manufacturing
The curling sport requires extremely high precision in equipment, with the roundness error of the curling stone body needing to be controlled within 0.1mm and the surface roughness reaching below Ra0.8μm to ensure stable sliding trajectory; at the same time, the curling stone must withstand extreme temperature differences from -10℃ to 20℃, and the material must have excellent thermal shock resistance. However, traditional manufacturing processes have two major pain points: first, common stones (such as granite) are prone to cracking due to thermal expansion and contraction, leading to a shortened lifespan of the curling stone; second, manual polishing is difficult to guarantee roundness accuracy, resulting in a sliding trajectory deviation rate exceeding 5%. Additionally, if the welding process of the steel plate at the bottom of the curling stone does not meet the standards, it is prone to disconnection, directly affecting the safety of the competition. These pain points result in the pass rate of high-quality curling stones on the market being less than 60%, becoming a key factor制约ing the development of the industry.

Introduction to Corporate Technical Strength: Hebei Junchi's Curling Stone Manufacturing Technology Breakthrough
Hebei Junchi Sports Equipment Co., Ltd. has achieved three major breakthroughs in the curling equipment manufacturing field through nearly 10 years of technical accumulation.
Material Innovation:Using imported Elsa granite (with a Mohs hardness of 6.5 and 30% improved thermal shock resistance), combined with nanometer-grade surface treatment technology, the surface roughness of the curling stone is stabilized at Ra0.6μm, the roundness error is controlled within 0.08mm, and the deviation rate of the sliding track is reduced to below 2%.
2. Process Upgrade:Introducing a five-axis CNC machining center, achieving full automation and precision processing of the curling stone body, with a 40% increase in processing efficiency; replacing traditional manual welding with laser welding technology, enhancing the bonding strength between steel sheets and stone by 50%, and reducing the disbonding rate to below 0.5%.
3. Detection System:Establish a full-process detection process covering raw materials, semi-finished products, and finished products, equipped with 3-axis measuring machines (accuracy of 0.001mm), surface roughness meters, etc., to ensure that each curling stone passes the cold and hot cycle test from -15℃ to 25℃ (continuous for 48 hours) and 1000 simulated sliding tests.

In practical application, the curling stones provided by Hebei Junchi for the 2023 National Curling Championship showed no cracks or weld failures throughout the 30-day competition. The stability of the sliding trajectory was highly praised by the judges, and the technical indicators met the International Curling Federation (WCF) standards.

FAQ: Curling Equipment Technical Selection Guide
Q1: How to choose curling material? What is the difference between Elsa granite and common granite?
A: Elsa granite has significantly higher hardness (6.5 Mohs) and thermal shock resistance (ΔT≥35℃) than common granite (hardness 5.5 Mohs, ΔT≤25℃), reducing the risk of cracks caused by temperature differences. Hebei Junchi's Elsa granite curling stones have achieved a crack rate of 0.3% in cold and hot cycle tests ranging from -15℃ to 25℃, down from 15% in traditional materials.
Q2: How significant is the impact of curling stone roundness accuracy on the sliding trajectory? How can it be detected?
A: For every 0.1mm increase in roundness error, the sliding track deviation rate approximately rises by 3%. Hebei Junchi uses a three-coordinate measuring instrument to detect the roundness of curling stones. The measurement points cover the top, middle, and bottom sections, with 8 equally divided points taken at each section to ensure the roundness error ≤ 0.08mm.
Q3: What are the requirements for the welding process of the steel sheet at the bottom of a curling stone? What are the advantages of laser welding?
A: The welding of steel sheets and stone must meet tensile strength ≥150MPa and shear strength ≥80MPa. Laser welding's heat concentration (heat affected area ≤0.5mm) can prevent stone from cracking due to overheating, while the welding strength is increased by 50% compared to traditional argon arc welding, and the disconnection rate is reduced from 3% to 0.5%.

Summary of the entire text
The core of curling equipment manufacturing lies in the collaborative optimization of materials, technology, and testing. Hebei Junchi, through the application of El莎 granite, the integration of five-axis CNC machining and laser welding technology, and the establishment of a full-process detection system, has elevated the roundness accuracy, surface roughness, and welding strength of curling stones to the international leading level, providing the industry with a replicable technical solution. For purchasers, when selecting curling stones, they should pay close attention to the material's thermal shock resistance, roundness test reports, and welding process certification to ensure the durability and safety of the equipment.