Electric drill is a drilling machine that uses electricity as power. It is a conventional product in power tools, and it is also the most demanded power tool product. The annual production and sales volume accounts for 35% of China's power tools. The main specifications of the electric drill are 4, 6, 8, 10, 13, 16, 19, 23, 32, 38, 49mm, etc. The numbers refer to the maximum diameter of the drill bit drilled on steel with a tensile strength of 390N / mm2. For non-ferrous metals, plastics and other materials, the maximum drilling diameter can be 30-50% larger than the original specifications.
The main specifications of the electric drill are 4, 6, 8, 10, 13, 16, 19, 23, 32, 38, 49mm, etc. The numbers refer to the maximum diameter of the drill bit drilled on steel with a tensile strength of 390N / mm2. For non-ferrous metals, plastics and other materials, the maximum drilling diameter can be 30-50% larger than the original specifications. Electric drill model_electric drill-working principle
The working principle of the ordinary drill electric drill is that the motor rotor of the electromagnetic rotary or electromagnetic reciprocating small-capacity motor performs magnetic field cutting and power operation, drives the working device through the transmission mechanism, and drives the gear to increase the power of the drill bit, so that the drill bit scrapes the surface of the object. Penetrate objects.
The birth of the world's power tools began with electric drill products-in 1895, the German Fein company developed the world's first DC electric drill, this electric drill weighs 14 kg, the shell is made of cast iron, and can only drill 4 mm on the steel plate Hole. Subsequently, a three-phase power frequency (50Hz) electric drill appeared, but the motor speed failed to exceed 3000r / min.
In 1914, a battery-powered electric drill appeared. The electric drill driven by a single-phase series excitation motor had a motor speed of more than 10,000 r / min.
In 1927, a medium-frequency electric drill with a power supply frequency of 150 to 200 Hz appeared. It has the advantages of high speed of single-phase series excitation motors and the advantages of simple and reliable structure of three-phase power frequency motors. However, due to the need for medium-frequency current power supply, Use is restricted.
In the 1960s, battery-powered drills without power cords that used nickel-cadmium batteries as power sources appeared. By the middle and late 1970s, due to lower battery prices and shorter charging times, this electric drill was widely used in Europe, America, and Japan.
The electric drill initially used cast iron as the shell, and later used aluminum alloy as the shell. In the 1960s, thermoplastic engineering plastics were applied to electric drills, and double insulation of electric drills was achieved.
In the 1960s, electronic speed governing electric drills also appeared. This electric drill uses thyristors and other components to form an electronic circuit, and the rotation speed is adjusted by the depth of the switch push button, so that the electric drill can be used according to the different processed objects (such as different materials, drilling diameter, etc.) Choose a different speed. Electric drill model_electric drill-classification
Hammer drill electric drill can be divided into three categories: hand electric drill, impact drill, hammer drill.
1. Hand electric drill: The power is the smallest, and the scope of use is limited to drilling wood and being an electric screwdriver. It does not have much practical value, and it is not recommended to buy it.
2. Impact drill: You can drill wood, iron and brick, but you can't drill concrete. Some impact drills indicate that drillable concrete is actually not feasible, but it is absolutely suitable for drilling ceramic tiles and thin cement on the outer layer of bricks. No problem.
3. Hammer Drill (Electric Hammer): It can drill holes in any material and has the widest scope of use.
The prices of these three types of electric drills are arranged from low to high, and the functions are also increasing. How to choose them depends on the scope and requirements of each.
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