Compare at the structure light quantify, material is light the impact that quantifies pair of robots is more immediate. The robot is used light quantify material to conduce to reduce moving specific power consumption, raise operation rate, promote work efficiency then. Besides, lighter self-prossessed drop sport to the robot inertial, increase behavioral accuracy to also have apparent profit. Composite material of aluminium alloy, magnesium alloy, carbon fiber is current commonly used robot is light quantify material, although 3 person light quantify the effect more apparent, but in specific application, function behaves a respect to still be put in certain difference.

(graphic representation: Mechanical arm) the aluminium alloy 　 in 　 mechanical arm besides having aluminous general character, because the aluminium alloy of different sort and model is added of alloying element differ and show a different function trait. The density of aluminium alloy is lesser, strength is greater, be close to tall alloy steel than intensity, exceed steel than stiffness, cast function and plasticity processability can good, in electric, heat conduction, anti-corrosive also compare ideal with solderability respect, can use as structural material. And, the applied cost of aluminium alloy is lower, application is very so wide. But its thermal stability is not quite ideal, in environment of work of a few extremes, incidental creep, it is important to should be used at the robot when operating a part, the operation essence of life that can affect a robot allows to spend. Accordingly, aluminium alloy material is qualitative more apply to model, education kind in the robot, unwell and operable Yu Zhu is built, the industry such as fire control. The magnesium of magnesium alloy 　 in mechanical arm is practical metal in light, its proportion is aluminous 2/3 about, it is the 1/4 of iron, to containing the polycarbonate composite material of 30% Bo fine for, magnesian density also does not exceed his 10% . Magnesium alloy is the alloy that comprises by magnesium and other element. Density of this kind of alloy big, stretch model measures small, intensity big, medicinal powder hot sex and disappear shake sex are good, bear concussion load ability is greater than aluminium alloy, be able to bear or endure organic matter and corrode function alkalinely strong. What the ASIMO crust of the 3rd generation of Japanese company uses is magnesium alloy material pledges, this makes of the robot reduce greatly again oneself, on foot rate rises 2.5km/h by original 1.6km/h, run greatly speed achieved 3km/h. But, the obdurability of magnesium alloy and iron and steel, aluminium alloy photograph is more inferior than returning, the demand that spurs robot material function still has difference, what cannot come true to wait for material to steely, aluminium alloy is complete replace. Because of the limitation of intensity, the magnesium alloy that regards a robot as material also affects his to cast directly, solder wait for treatment function, also cannot satisfy the applied requirement that bigger load carries, be used at the light-duty robot component such as medical treatment, homemaking commonly. The intensity of composite material of carbon fiber of 　 of of carbon fiber composite material in mechanical arm big, weight light, creep is small, the number that comparing intensity is iron and steel is decuple, processability can be good, apply to a variety of shaping method, often be used at the place such as robot arm, joint. For example, answer material is move favour one when robot of check of make one's rounds of station of distribution of electrified wire netting measures a body to make but adjustable robot crust, of imponderability self-prossessed can reduce mechanical energy cost substantially, lengthen working hours, make a robot more smooth when shift safe. Compare data of Yu Mei alloy, aluminium alloy, the function feature of carbon fiber composite material more apply to medium or small industry kind robot, can be in wear away higher load, high, enlist in army below the environment of tall use frequency. Although its application cost is higher, but its distinct performance advantage nots allow to ignore in the process of trade of intelligent chemical industry in future. Anyhow, the robot is light quantifying development is trend place, the sort that the robot involves is very much also, the component of different work environment and different position is having diverse demand to material, select material of robot of answer material proposal needs move favour to consider integratedly from the much angle such as inertia of quality, stiffness, motion. For example, manipulator arm is motility component, need has good controlled sex, so the material of mechanical arm must avoid ponderosity. Meanwhile, the material of manipulator arm needs to enough strength and stiffness bear character load, cannot appear absolutely meet an emergency and rupture, here the circumstance falls, carbon fiber composite material suits more than magnesium alloy, aluminium alloy. And, in the operating mode according to manipulator arm requirement and integrated cost undertake accepting or reject choosing when, need notices the unifinication application of a variety of material, such ability make of manipulator arm light quantify value to get be reflectinged effectively.