Bike Racks Processing Technology
The frame material from the earliest chrome molybdenum steel, evolved to aluminum alloy, Bike Racks and then the use of composite materials such as carbon fiber, Bike Racks there are other scandium alloy, magnesium alloy, titanium alloy, the industry continue to develop new material formula to enhance the pipe and structural design capabilities And innovative processing technology, just to make the frame lighter, stronger, Bike Racks more comfortable and more streamlined and beautiful. Density is one of the key factors determining the weight of the frame, the lower the density, the lighter the frame can be made, the density of the chrome molybdenum steel is 7.9, the aluminum alloy is 2.6-2.9, the titanium 4.5, the titanium alloy 4.3-5.1, Material 1.6, magnesium alloy 1.7, Bike Racks which can be seen chrome molybdenum steel the highest density, the lowest carbon fiber composite. However, in addition to the weight of the frame, but also to consider the tensile strength, elasticity coefficient, so although the density is low, but not enough strength.
In general, the rigidity of the frame is determined by the elastic modulus of the material, the elasticity coefficient of the steel is 30, the aluminum is 10-11 and the titanium 15-16.5. Bike Racks Therefore, when the pipe diameter and wall thickness are the same, the rigidity of the aluminum frame is only steel frame One-third of the rigidity of the titanium frame is only one-half the steel frame. Frame strength is determined by the strength of the material, the yield strength and the quality of the frame pipe, heat treatment process and alloy composition has a great relationship. Aluminum precipitation point only 11-59, titanium 40-120, steel 46-162, Bike Racks compared to aluminum is more fragile and vulnerable. In the actual design, each frame of the pipe diameter will determine the size of the frame stiffness, strength and weight, pipe wall thickness will also affect the frame strength and weight. Bike Racks Some of the most suitable design of the frame in some places emphasize rigid, in some places to strength, in some places to shock, it must be in different functional demands of the site with the appropriate material, and the combination of different materials technology is also a large test.
Steel is the longest frame material used on bicycles. Bike Racks The main advantages include long rigidity of rigidity ride, flexible (shock absorbing) pipe, good handling of pipe and easy processing, easy welding and no heat treatment, so the cost and The price is relatively low. Disadvantages are heavy weight,Bike Racks improper maintenance easy to rust, pipe shape is not easy and metal fatigue problems. However, many of today's alloy steel has been in the rigid, elastic coefficient, transmission, stability, get a good effect, Bike Racks the only fly in the oder is still heavier weight. Steel molybdenum steel in the most common, high strength and easy to pump processing. Molybdenum can improve the strength of steel to prevent brittle; chromium can make steel corrosion resistance,Bike Racks rust and prevent high temperature oxidation. Many hand-made steel pipe carcassers most recommend is its excellent sense of road and suitable for long-distance riding the comfort of the advantages, as the steel gourd said: "steel forever, Bike Racks a perpetuating!" Suitable for use in BMX actually Car, long distance wagon and truck.
Aluminum alloy is currently the most common use of the material on the market,Bike Racks the advantage is light weight, short hardness and rigidity of the best performance, Bike Racks easy to shape, not rust, light to the tube can be very thin, The use of CNC die cutting to make exaggerated appearance and amazing strength. Disadvantages are almost no flexibility at all, will accumulate metal fatigue, but also because of its Ning Min light, high rigidity characteristics, it is easy to convey the ground vibration, resulting in poor riding comfort. Bike Racks Aluminum frame in early 1990 began to popular, since 1995 began to universal, the general use of 6061 and 7005 aluminum alloy frame material. The aluminum alloy is suitable for use on racing, Enduro and Downhill models. Bike Racks Huge Technology Center pointed out that compared with the AL7005 will have stress corrosion and welding hot cracking problem, AL6061 in the use and process are more stable, Bike Racks but the heat treatment is more complex.
Carbon fiber is not a metal, but a composite material, the use of carbon fiber woven into a cloth, after the process of prepreg resin into a prepreg, and then prepreg cloth and then laminated into the mold heating molding, according to demand Various shapes of the frame. Its characteristics are lightweight, Bike Racks more elastic (shock absorption good), riding a sense of stability, long-distance tracking continued good feeling, Bike Racks high comfort, process changes, but the surface hardness is poor, when the applied force is higher than its damage strength When it will cause a break. Moreover, in recent years due to the increasing demand for carbon fiber yarn, resulting in material shortages, so the price is high. Carbon fiber tensile strength is strong, but the shear strength is weak, Bike Racks the need for complex stress calculation (longitudinal rigidity, transverse rigidity), according to the calculation of carbon fiber sheet overlap molding. Generally referred to the high modulus (Hight Module, HM), refers to the high tensile strength of carbon fiber material.