In the 19th century, in order to grind slotting cutter, flood-field grinding wheel gear grinding machine was invented in the U.S.. In the early 20th century, with the fast development of automobile industry, in the Germany, the conical surface grinding wheel gear grinding machine was invented and meanwhile in the U.S. grinding wheel gear grinding machine was used to grind automobile wheel gears. In the 1914, in order to improve the grinding accuracy, dish design grinding wheel gear grinding machine was invented in Switzerland, which is useful to reduce grinding wheel abrasion. Later in the 1930s, worm grinding wheel gear grinding machine was firstly used in Switzerland, after that the working efficiency was improved greatly.
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