The MITSUI SEIKI GSH 200A thread-grinding machine combines the flexibility of application, high processing speeds, and consistent precision to complete an extensive selection of threading jobs. The GSH 200A is engineered to handle a variety of workpiece sizes: The maximum diameter swing over the machine table is 48.0 mm and the distance between centers is 2,250 mm, so the machine is available to grind a maximum screw length of 2,000 mm and maximum workpiece diameter of 200 mm.
The machine’s capabilities include a 15-kW direct-drive motor that produces a maximum wheel spindle speed of 6,000 m/min. X-axis stroke of 330 mm features a rapid feed-rate of 5 m/min; Z-axis stroke is 2,150 mm with 10m/min rapid feed; and maximum work spindle speed is 200 rpm.
Sliding machine surfaces are hand-scraped to maximize precision. In addition, multiple systems minimize thermal displacement that can affect thread accuracy and consistency. The lubricant in the table-feed lead screw and shaft core stabilizes temperatures of those components. The main coolant nozzle cools, lubricates, and removes sludge at the grinding point, while separate work area and bed coolant showers equalize internal machine temperatures. Oil and air lubricate and cool grinding wheel axis bearings. The GSH 200A machine is compatible with both oil-based and water-soluble coolant, selectable when the machine is produced.
The GSH 200A permits users to apply CBN as well as standard grinding wheels, facilitating grinding of hardened steels as well as unhardened workpieces. CBN wheels can grind more than 2 times faster than standard wheels and provide longer grinding life, which extends the dressing interval and reduces dressing time per workpiece. Mass production scenarios multiply those benefits. The maximum diameter for standard wheels is 46.0 mm and peripheral speed is 60 m/sec, while the maximum CBN wheel diameter is 380 mm and peripheral speed 120 m/sec.
Automation features on the GSH 200A include an automatic phase adjuster, automatic notch position adjuster, and automatic effective diameter adjuster. Together, the features permit an operator to leave the machine rather than remaining to adjust the steady rest and oblique diameter during the operation. The auto-effective diameter adjuster uses a touch probe to contact the thread groove and measure change in diameter by scanning. An acoustic emissions (AE) sensor built into the wheel spindle provides automatic wheel in-feed position adjustment. Learn more at www.mitsuiseiki.com
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