Design of Drilling and Broaching Modular Machine for Railway Bearing Retainer

This paper introduces a scheme of a modular machine for railway bearing retainer drilling and broaching.The machine was equipped with a automatic rotating and indexing clamp and five heads which were arranged with horizontal style.Hydraulic slide tables,drilling heads,automatic centralized lubrication system and violent coolant system are used.The base of the machine has high rigidity due to its integral structure;five heads locate around the center of the base,the angle between the center line of every adjacent heads is 2/14×360°;the workpiece was clamped on the clamp device manually,ratchet wheel was driven by a hydraulic cylinder for the purpose of indexing,and clamping and positioning was performed by a wedge-shaped dowel which was putted into the indexing plate by a hydraulic cylinder also;Tools fixed on tool connectors adapt to rigid machining;the hydraulic pump unit is separately from the base;the machine was controlled by PLC.