Until now, we are accustomed to the construction of machine tools that are different from conventional and traditional forms. Every new way of arranging axes or positioning cutting tools and workpieces has prompted us to rethink the fundamentals of metal cutting and discover new options for producing parts more efficiently. Vertical grinding is a testament. As the name implies, vertical grinding fixes the workpiece to a rotating chuck in the machine base, similar to the way the workpiece is positioned on a vertical lathe. The grinding spindle moves up and down from above the workpiece, from one end to the other (possibly rotating).
In recent years, one of the main advocates of vertical grinding is Taiyo Koki, a grinding machine manufacturer headquartered in Nagaoka, Japan. The company is now a member of MoriSeiki and therefore it has a more active position in the North American grinding machine market.
Taiyo Koki produces many types of grinding machines, but it is worth noting that many of its models are based on the principle of vertical grinding. From a structural point of view, the distinguishing feature of these grinding machines from other grinding machines is that both the grinding spindle and the workpiece are mounted vertically, rather than horizontally, in order to grind the inner diameter, outer diameter and surface of the cylindrical part. The grinding head is controlled simultaneously on the horizontal axis (direction of the workpiece diameter) and the vertical axis (longitudinal direction of the workpiece). These machines are good at grinding round shapes. The following describes the reasons why vertical grinding has its special value: 1 Less distortion, better roundness on vertical grinders, and the workpiece is mounted upright in the chuck.
On horizontal grinders, the clamping force must ensure that the workpiece does not fall outside the chuck. Vertically clamped workpieces only require sufficient clamping force to resist grinding forces. Gravity favors the grinding process, not hindering grinding. Since only a small clamping force is required to fix on the vertical grinder, the workpiece deformation may be less. This reduces the chance of roundness error. According to the manufacturer, according to the results obtained from the standard test pieces, the vertical grinder can achieve roundness error of less than 1 μm (less than ±0.000039 inch). Once installed, the vertical grinding machine can be used to machine outer diameter, inner diameter and surface grinding. According to the shape of the workpiece, all three tasks can be implemented in one loading. When this is possible, errors due to multiple loadings are avoided. The roundness between the inner and outer diameters, and the perpendicularity of the inner diameter, outer diameter, and surface can be more precisely maintained. Because the workpiece and the grinding spindle are vertical, there is virtually no problem with cornering.
The machine structure is inherently rigid. Merging operations in one step installation brings significant economic benefits. Fewer installations means less part handling, shorter setup times, fewer machine tools, and lower labor costs. Ergonomic vertical grinders are easier to load and unload. Manual loading and unloading eliminates the need to support the workpiece while starting the chuck. The operator simply installs the workpiece down into the chuck. Centering the workpiece also occurs more naturally because there is no non-uniform gravity when the jaws are closed. Loading and unloading with cranes or robots may also be easier because the workpieces in the chuck have the same stable positioning on the rotary car or on the transmission disc.
For example, dish-shaped parts such as gears can be transported horizontally for pick-up installation. It is also placed horizontally down in the chuck of the grinding machine. Vertical grinders are usually smaller than comparable horizontal grinders. Vertical grinders take up more space and occupy less space. This leaves space for automatic loaders or robots next to the machine, making automation an even more attractive option. Without dust on a horizontal grinder, the sliding surfaces of the X and Z axes are lower than the grinding points.
In recent years, one of the main advocates of vertical grinding is Taiyo Koki, a grinding machine manufacturer headquartered in Nagaoka, Japan. The company is now a member of MoriSeiki and therefore it has a more active position in the North American grinding machine market.
Taiyo Koki produces many types of grinding machines, but it is worth noting that many of its models are based on the principle of vertical grinding. From a structural point of view, the distinguishing feature of these grinding machines from other grinding machines is that both the grinding spindle and the workpiece are mounted vertically, rather than horizontally, in order to grind the inner diameter, outer diameter and surface of the cylindrical part. The grinding head is controlled simultaneously on the horizontal axis (direction of the workpiece diameter) and the vertical axis (longitudinal direction of the workpiece). These machines are good at grinding round shapes. The following describes the reasons why vertical grinding has its special value: 1 Less distortion, better roundness on vertical grinders, and the workpiece is mounted upright in the chuck.
On horizontal grinders, the clamping force must ensure that the workpiece does not fall outside the chuck. Vertically clamped workpieces only require sufficient clamping force to resist grinding forces. Gravity favors the grinding process, not hindering grinding. Since only a small clamping force is required to fix on the vertical grinder, the workpiece deformation may be less. This reduces the chance of roundness error. According to the manufacturer, according to the results obtained from the standard test pieces, the vertical grinder can achieve roundness error of less than 1 μm (less than ±0.000039 inch). Once installed, the vertical grinding machine can be used to machine outer diameter, inner diameter and surface grinding. According to the shape of the workpiece, all three tasks can be implemented in one loading. When this is possible, errors due to multiple loadings are avoided. The roundness between the inner and outer diameters, and the perpendicularity of the inner diameter, outer diameter, and surface can be more precisely maintained. Because the workpiece and the grinding spindle are vertical, there is virtually no problem with cornering.
The machine structure is inherently rigid. Merging operations in one step installation brings significant economic benefits. Fewer installations means less part handling, shorter setup times, fewer machine tools, and lower labor costs. Ergonomic vertical grinders are easier to load and unload. Manual loading and unloading eliminates the need to support the workpiece while starting the chuck. The operator simply installs the workpiece down into the chuck. Centering the workpiece also occurs more naturally because there is no non-uniform gravity when the jaws are closed. Loading and unloading with cranes or robots may also be easier because the workpieces in the chuck have the same stable positioning on the rotary car or on the transmission disc.
For example, dish-shaped parts such as gears can be transported horizontally for pick-up installation. It is also placed horizontally down in the chuck of the grinding machine. Vertical grinders are usually smaller than comparable horizontal grinders. Vertical grinders take up more space and occupy less space. This leaves space for automatic loaders or robots next to the machine, making automation an even more attractive option. Without dust on a horizontal grinder, the sliding surfaces of the X and Z axes are lower than the grinding points.
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