CNC machine tools are the combination of information technology and mechanical manufacturing technology, representing the technical level and development trend of modern basic machinery. Chinas CNC machine tool industry has developed rapidly, and there are nearly one hundred CNC machine tool manufacturers. By the year 2000, the number of CNC machine tools has grown to 1,000, of which 100 have reached the international level in the early 1990s. The average time between failures of CNC machine tools and CNC systemsis 10,000 hours, and the annual output reaches 20,000 units. The popular products are basically based in China.
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Grinding machines can process harder materials such as hardened steel and hard alloys; they can also process brittle materials such as glass and granite. Grinding machines can be used for grinding with high precision and surface roughness, as well as for highly efficient grinding such as strong grinding.
In the 1830s, in order to adapt to the hardening of parts such as watches, bicycles, sewing machines and firearms, the United Kingdom, Germany and the United States developed grinding machines using natural abrasive wheels. These grinding machines were made by adding grinding heads to existing ready made machine tools such as lathes and planers. They are simple in structure, low in rigidity, and prone to vibration during grinding, requiring the operator to have a high skill in order to grind out precise workpieces. The universal cylindrical grinding machine manufactured by Brown Sharp Company of the United States exhibited at the Paris Exposition in 1876 was the first machine to have the basic characteristics of a modern grinding machine. Its workpiece headstock and tailstock are mounted on a reciprocating table that increases machine rigidity and has an internal grinding accessory. In 1883, the company made a surface grinder with a grinding head mounted on a column and a reciprocat...
Spindle components The line speed of the grinding wheel is generally 3060m/s, the CBN grinding wheel can be as high as 150200m/s, and the highest spindle speed is 15000r/min. The spindle unit is the pivotal component of the grinding machine. For high speed and high precision unit systems, it should have the characteristics of good rigidity, high rotation precision, small temperature rise, good chaos, low power consumption, long life and moderate cost. The bearings of the grinding wheel spindle unit often use high precision dynamic elastic bearings, hydrostatic bearings, hydrodynamic bearings, and message compression bearings. High speed and ultra high speed grinding machines are increasingly using electric spindle unit components. Feeding unit The feed unit includes a servo drive unit, a moving member, a position monitoring unit. The feed unit is a necessary prerequisite for maintaining the normal operation of the grinding wheel and is one of the important indicators for e...
The universal cylindrical grinder manufactured by Brown Sharp, an American company, exhibited at the Paris Exposition in 1876, was the first machine to possess the basic characteristics of modern grinders.
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