Grinding characteristics and hazard identification (
Grinding application range is very wide, usually as a finishing process, spare parts is by means of the abrasive cutting action, remove extra layer on the surface of the work, the workpiece surface quality to the expected requirements of the processing method.
Called a grinding machine for grinding machine tools.
From a security perspective, grinding has the following characteristics: 1.
High speed grinding tool.
The ordinary grinding can be up to 30 -
50 m/s, high speed grinding can reach 45 -
60 m/s or higher, and the trend of increasing its speed.
The heterogeneous structure of grinding tool.
Abrasive is made of abrasive, binder and porosity of three elements of composite structure, its structural strength is much lower than by a single homogeneous wit half of metal cutting tools.
The grinding heat phenomenon.
More abrasive high-speed movement, grinding blade and micro cutting, will produce a large number of grinding heat, not only may burn the workpiece surface, and high temperature when the abrasive itself change physical, chemical, thermal power, reduce the intensity of the grinding tool.
Zili phenomena of the grinding tool.
Under the influence of grinding force, grinding blunt abrasive embrittlement or falls off phenomenon.
In the process of grinding abrasive zili and fixed abrasive, produces a large number of grinding dust.
Due to the special structure of the abrasive and grinding the special processing methods, the dangerous and harmful factors endangering the operator's safety and health, 1 basically has the following several aspects.
Mechanical damage is refers to the grinding machine itself, abrasive grinding workpiece collisions with the operator contact, or is the damage.
Personnel in contact with the grinding of mechanical parts, for example, damage, contact with the abrasive rough surface scratch, gripping not firm cuts, such as the machined part.
High speed movement abrasive debris flew to jilt blow hurt after destruction, is the most serious injury accident grinding machine.
Grinding machinery is loud machines, grinding noise from the joint action of many factors, in addition to the grinding of mechanical transmission system, dry grinding system of exhaust noise and cooling system noise wet grinding, grinding cutting, high speed is larger than the can produce the main reason of grinding noise.
Especially for coarse grinding, cutting, polishing and grinding plate, and the use of air grinder, noise is bigger, sometimes as high as 115 db,
Or more, hearing damage to the operator.
Grinding is a micro cutting, cutting small, especially abrasive zili, and for dressing grinding tool, will produce large amounts of dust.
According to the measurement, dry grinding, dust in the less than 5 & mu;
M particles on average 90%.
Long-term a large number of grinding dust suction can lead to lung tissue fibrosis, cause pneumoconiosis.
Wet grinding with grinding fluid, to improve the grinding of the cooling conditions, to prevent burns and workpiece surface crack, flushing grinding, reduce friction, reduce dust has a very important role.
However, long-term exposure to grinding fluid can cause dermatitis;
Oil-based grinding liquid atomization can damage the respiratory organ in the people;
Improper selection of grinding fluid types to reinforce the abrasive abrasive erosion, reduce its strength, the risk of damage;
Wet grinding and improper management electrolytic grinding, can also affect the electrical equipment safety.
A fire hazard.
Grinding with inflammable and explosive diluent, oil-based grinding fluids and its atomization, grinding burn is the unsafe factors cause fire.