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A <a href="http://www.daotian-tech.com/grinding-wheel/"
target="_self">grinding wheel</a> is a wheel used for grinding. Grinding wheels
are composed of abrasive compounds and are used for various grinding (abrasive
cutting) and abrasive machining operations. Such wheels are used in grinding
machines. The wheels are generally made with composite material . This consists of
coarse-particle aggregate pressed and bonded together by a cementing matrix
(called the bond in grinding wheel terminology) to form a solid, circular shape.
Various profiles and cross sections are available depending on the intended usage
for the wheel. They may also be made from a solid steel or aluminium disc with
particles bonded to the surface. Today most grinding wheels are artificial
composites made with artificial aggregates, but the history of grinding wheels
began with natural composite stones, such as those used for millstones. The
manufacture of these wheels is a precise and tightly controlled process, due not
only to the inherent safety risks of a spinning disc, but also the composition and
uniformity required to prevent that disc from exploding due to the high stresses
produced on rotation. Grinding wheels are consumables, although the life span can
vary widely depending on the use case, from less than a day to many years. As the
wheel cuts, it periodically releases individual grains of abrasive, typically
because they grow dull and the increased drag pulls them out of the bond. Fresh
grains are exposed in this wear process, which begin the next cycle. The rate of
wear in this process is usually very predictable for a given application, and is
necessary for good performance.
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<p>
Drills are cutting tools used to remove material to create holes, almost
always of circular cross-section. Drills come in many sizes and shapes and can
create different kinds of holes in many different materials. In order to create
holes <a href="http://www.daotian-tech.com/drill-bit/" target="_self">drill
bits</a> are usually attached to a drill, which powers them to cut through the
workpiece, typically by rotation. The drill will grasp the upper end of a bit
called the shank in the chuck. Drills come in standardized drill bit sizes. A
comprehensive drill bit and tap size chart lists metric and imperial sized drills
alongside the required screw tap sizes. There are also certain specialized drill
bits that can create holes with a non-circular cross-section. Most drill bits for
consumer use have straight shanks. For heavy duty drilling in industry, bits with
tapered shanks are sometimes used. Other types of shank used include hex-shaped,
and various proprietary quick release systems. The diameter-to-length ratio of the
drill bit is usually between 1:1 and 1:10. Much higher ratios are possible (e.g.,
"aircraft-length" twist bits, pressured-oil gun drill bits, etc.), but
the higher the ratio, the greater the technical challenge of producing good work.
The best geometry to use depends upon the properties of the material being
drilled. <br/>
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<p>
Grinding is a mechanical method of removing material, refers to the processing
method of removing excess material on the workpiece with abrasives and abrasive
tools. Grinding is one of the most widely used material removal methods. Grinding
processing belongs to finishing processing in mechanical processing (machining is
divided into roughing, finishing, heat treatment and other processing methods),
with less processing volume and high precision. It is widely used in the machinery
manufacturing industry. Carbon tool steel and carburizing and quenching steel
parts that have been heat treated and quenched often have a large number of
regularly arranged cracks on the surface that is basically perpendicular to the
grinding direction during grinding-grinding cracks , it not only affects the
appearance of the part, but also directly affects the quality of the part.
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<p>
Grinding, according to different process purposes and requirements, there are
various forms of processing methods. In order to meet the needs of development,
grinding technology is developing towards precision, low roughness, high
efficiency, high speed and automatic grinding. There are many forms of grinding
processing methods. In production, grinding mainly refers to grinding with
grinding wheels. In order to facilitate use and management, grinding processing
methods are usually divided into four methods according to the grinding processing
form and processing objects of grinding machine products:<br/>1. According to the
grinding accuracy, it is divided into rough grinding, semi-finishing, fine
grinding, mirror grinding and super-finishing.<br/>2. According to the feed form,
it is divided into plunge grinding, longitudinal grinding, slow feed grinding,
no-feed grinding, constant pressure grinding, and quantitative grinding.<br/>3.
According to the grinding form, it can be divided into belt grinding, centerless
grinding, face grinding, peripheral grinding, wide grinding wheel grinding,
forming grinding, profiling grinding, oscillation grinding, high-speed grinding,
strong grinding, Constant pressure grinding, manual grinding, dry grinding, wet
grinding, grinding, honing, etc.<br/>4. According to the machined surface, it is
divided into cylindrical grinding, internal grinding, surface grinding and
sharpening (gear grinding and thread grinding)<br/>In addition, there are many
ways to distinguish, for example, according to the type of <a
href="http://www.daotian-tech.com/grinding-tools/" target="_self">grinding
tools</a> used in grinding: the grinding method of fixed abrasive abrasives and
the grinding method of free abrasives. The grinding methods of abrasive abrasive
tools mainly include grinding wheel grinding, honing, abrasive belt grinding,
electrolytic grinding, etc.; the processing methods of free abrasive grinding
mainly include grinding, polishing, jet machining, abrasive flow machining,
vibration machining Etc. According to the level of the grinding wheel linear speed
Vs, it is divided into: ordinary grinding Vs<45m/s, high-speed grinding
45m/s<=Vs<150m/s and ultra-high-speed grinding>=150m/s. According to the
new technology adopted The situation is divided into: magnetic grinding,
electrochemical polishing, etc.
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