Given the uniqueness, uniqueness and excellent air supply efficiency of Hengzhengtong's oversized ceiling fan blades, we feel obligated and obliged to respond and explain the consistency of blades manufactured using the stamping process, because this is the part that causes the most doubts and confusion.
For Hengzhengtong oversized ceiling fan blades, consistency should include two aspects: consistency of blade shape and high consistency of four blades in the horizontal plane after installation.
The consistency of the shape is related to the level of manufacturing and process design.
The 5052 aluminum-magnesium alloy sheet used in the blade comes from Southwest Aluminum Products Group, a subsidiary of China Aluminum Group. Even including the branches opened by international giants in China, Southwest Aluminum's products are first-class. The company is also a designated supplier to China's aerospace industry.
The manufacturing process of blades in Hengzhengtong factory is:
CNC plasma cutting machine cutting aluminum → hot air fan air drying aluminum plate → special mold stamping blade forming → touch welding machine closed blade into closed form→ special mold fixed point drilling to install petioles.
From the point of view of manufacturing errors:
The allowable error of the CNC plasma cutting machine is 4 meters long and 1.5 meters wide aluminum plate, the length error of the diagonal is ±3 mm, which translates to a dimensional error of about 7300.1 mm on the fan blade with a diameter of 5 mm.
The dimensional error generated by the special mold stamping blade process can also be controlled at about 1mm.
The blade closures have been fitted to each other after the stamping process, and the collision welding process of the closed blades will not produce blade distortion and deformation.
The installation petiole is drilled at a fixed point with a special mold to ensure the consistency of blade shape, especially windward angle data.
The factory is equipped with special personnel on the custom-made blade consistency inspection table to spot check the manufactured blades in a large proportion. According to our test data, the consistency of the blade, especially the twisting error of the blade root to the tip of the leaf, is controlled within 15 mm in the batch.
Hengzhengtong is the only oversized ceiling fan enterprise in the world that adopts removable rubber vibration isolation sleeve. The function of rubber vibration isolation sleeve is to absorb the vibration generated by the rotation of the blades, eliminate the resonance between the blades, and absorb the collision energy when the blades are collided with external forces, and protect the hub, motor and roof structure.
The blade and the hub diameter are inlaid with a vibration isolation sleeve, not directly connected, the blade is still and running, the rubber vibration isolation sleeve is squeezed, stretched effect, is the rubber sleeve in a small range of deformation.
The design hardness of the rubber vibration isolation sleeve is 70 degrees, about 10% of the manufacturing error, so after the blade installation is completed, due to the error of the hardness of the rubber vibration isolation sleeve, it is possible to produce a slight difference in the horizontal height between the 4 blades when stationary or running, although it is difficult to observe this inconsistency with the naked eye.
Internationally, blades with a maximum linear speed of less than 50 m/s are classified as low-speed blades, and for low-speed blades, the dynamic balance of the blades and the consistency of the shape have little impact on the fan's wind efficiency, air volume, wind noise and other functions. The highest blade line speed of the super-large ceiling fan when running is about 20 m/s, as its product name advertises "high air volume and low speed", the above errors can almost ignore the use of the product.
Considering the wind efficiency and safety of stamping process blades, considering the outstanding safety role of rubber vibration isolation sleeves, and considering that the above errors do not affect the use function of the product at all, Hengzhengtong still manufactures stamping process blades and recommends customers to choose such blades.
Of course, in line with the pursuit of the ultimate craftsman spirit, Hengzhengtong will continue to improve the production process, improve the manufacturing level, and continue to improve the consistency of products.