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Methods of Manufacture title

Characteristics and Use

  1. PVA
  2. Resinoid
  3. Vitrified

    PVA
Photo by PVA Characteristics
  • PVA grinding stones are generally known as elastic grinding wheels. They are shaped as porous grinding wheels with high elasticity, using PVA (polyvinyl alcohol) as the bonding agent. Their polishing characteristics are that of a typical shedding type, which enables an excellent polish on finished surfaces when using an ultrafine grain. Grain sizes up to #10,000 can be used.
  • Since the degree of elasticity can be controlled, we can meet our customers' needs for precision-polish grinding wheels.
Use
  • Since PVA grinding wheels have superior polishing characteristics, they are used mainly for nonferrous metal materials (aluminum, copper, chromium etc.), nonmetallic materials (glass, resin), and surface polishing of materials that are difficult to cut.
  • Examples of use include: grinding and polishing different types of magnetic heads and gravure rolls (copper cylinders for gravure printing).

    Resinoid
Photo by Resinoid Characteristics
  • Fired at low temperature (approximately 200°C<392°F>) using synthetic resin, such as phenol resin, as the bonding agent.
  • Can be manufactured using ultrafine grains and mixed abrasive grains, which are difficult to use in the vitrified grinding wheels without deformation.
  • High impact-resistance and high mechanical strength, such as tension, bendability, and compression strength. This type of wheel is widely used, from precision polishing to rough grinding.
Use
  • Because of its high grinding performance, this type of grinding stone can be used wherever a high-precision finish is required, such as the mirror finishing of magnetic heads for audio/video equipment and card readers, or for ferrite cores and edge polishing of optic fiber connectors.
  • Thanks to the high holding strength of the abrasive grain, this type of wheel can be used for high-efficiency, high-load, and high-speed grinding. The majority of rough grinding depends on this type of grinding stone.

    Vitrified
Photo by Vitrified Characteristics
  • The primary characteristic of this type of grinding stone is its very high holding strength created by using feldspar and clay as the bonding agent, which, when kneaded and molded with silicon-carbide abrasive grain or fused alumina with an appropriate amount of bonding agent, are heated to approximately 1300°C<2372°F>. As a result, these grinding stones do not deform at normal temperatures and they have superior grinding ability and resistance to chemicals. They can also withstand long-term storage.
  • Holding strength of abrasive grain is easily and widely adjustable.
  • Grain size range from Rough (#20) to Ultrafine (#4000), and so can be used for general to precision grinding.
  • Large, porous types of vitrified wheels have been recently developed to better handle loading that occurs while grinding.
Use
  • The characteristics of vitrified grinding wheels enable them to be used in an expanding variety of applications: from general ferrous materials to hardened steel, super-alloys, and cast iron to non-ferrous metals and non-metallic materials. They are also being used in the truing and dressing of diamond tools and in filters that make use of their porosity.

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