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Electric drill products used at home (known as DIY abroad) have low requirements for service life, work efficiency, processing accuracy, etc., and the number of products is large, accounting for about 70~80% of the total electric drill products; another 30~20%. Electric drill products are professional tools, that is, products commonly called "industrial
Electric Tools" in China, have higher technical requirements, including machining accuracy, reliability of use (such as one failure time, number of damages), service life, and performance level. (such as torque, coaxiality), etc. are higher than household products.
An electric drill is a drilling tool 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 electric drills are 4, 6, 8, 10, 13, 16, 19, 23, 32, 38, 49mm, etc. The number refers to the maximum diameter of the drill bit for drilling 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 specification.
Principle:
The working principle of the electric drill is that the motor rotor of the electromagnetic rotary or electromagnetic reciprocating small-capacity motor performs magnetic field cutting and work operation, and the operating device is driven by the transmission mechanism to drive the gear to increase the power of the drill bit, so that the drill bit scrapes the surface of the object and penetrates the object better. .
Application:
1. Construction and Industry
It is widely used in the reinforcement of building beams, slabs, columns, walls, etc., decoration, wall installation, brackets, railings, billboards, air conditioner outdoor units, guide rails, satellite receiver elevators, steel structure workshops, etc.
2. Medical applications
(1) Dental:
At the beginning of the 20th century, a wall-mounted three-bend dental drill appeared, with a speed of 4000 r/min, and some even reached 10,000 r/min. The rope wheel-driven three-bend dental drill that we are still widely used is its derivative. thing.
(2) Otology:
Julius Lempert, the father of modern otology, pioneered the use of electric drills for ear surgery in New York in 1938 to treat chronic ear diseases and reduce the incidence of facial nerve damage. But the electric drills of the time were difficult to control and were very noisy. Modern electric and air drills greatly increase the rotational speed and enhance the cutting capacity. The use of fast cutting drills, diamond drills and irrigation-suction systems enables otologists to quickly complete accurate surgical dissections and greatly reduce operating time.
