Industrial Technology Research Institute

Chang-Ming Chen

Wei-Han Wang

Lai-Sheng Chen

Shih-Chou Chen

Wen-Wang Jiang

Spring C-c Hung

Jung-Hong Hwang

Hsieh Chi Maw

The invention, relating to an internal, active, compensatory and method and device for the rotational main-shaft of a cutting tool with axial bias-and-swing, mainly applies an active technique to a gas-floating main-shaft to thereby control its bias-and-swing. A sensor at the exterior of the main-shaft directly measures the axial bias-and-swing of the cutting tool. Taking the measured data as feedback signals, the cutting point of the cutting tool is maintained at an axial positioning accuracy that is predetermined. Further, the invention is arranged with an electromagnetic controlling module to the mandrel's tail end at the interior of the main-shaft for taking non-contacting magnetic force to finely tune the axial position of the mandrel, such that an active compensatory function of the axial position of the cutting point of a cutting tool in action is achieved.

Internal, active, and compensatory method and device for the rotational main-shaft of a cutting tool with axial bias-and-swing

A cutting force sensor for measuring the variation of cutting force in a cutting machine includes a screw shape body to serve as a locking screw in a turret of the machine. The sensor has a pair of strain gauges at one end of the sensor to measure and detect the cutting force variations of a cutting tool held by the turret and send the signals to a pair of Wheatstone Bridges located at another end of the sensor. The signals are then filtered, amplified and analyzed for monitoring the cutting tool wear and/or breakage condition. The sensor is located close to the cutting point and therefore can generate high S/N (Signal/Noise) ratio and produces more precise measurements. The sensor is of low cost and does not take additional space and can be readily used in an existing machine without requiring expensive structural changes. The sensor also contains a slot opening with a predetermined dimension formed in the bottom portion so as to improve the sensitivity of the sensor without comprising its structural integrity.

Cutting force sensor in the form of a turret locking screw

An air-jet driven dynamic balance test apparatus for testing the dynamic balance of minrotors with minimum interference from external vibration noise. The dynamic balance test apparatus comprise a resilient supporting steel sheet having a horizontal bottom portion fastened to a base and an elongated upright body portion extended upwardly from the horizontal bottom portion to carry the sample to be tested. An air-jet generating device is provided to produce a continuous stream of compressed air for rotating the sample about its central axis. The resilient supporting steel sheet contains a resilient section for increasing sensitivity of said test apparatus. The resilient supporting steel sheet contains a resilient section, which can be the resilient steel sheet itself or in the form of a row of through holes or a corrugated section. A detector is mounted on the resilient supporting steel sheet to detect the vibration as the sample is being rotated during testing. An electromagnetic valve and a pressure regulating valve connected to an I/O interface of a master computer can be provided to automatically regulate the pressure of the continuous stream of the compressed air so as to control the revolving speed of the sample being tested at a predetermined constant rotation speed.

Air-jet driven dynamic balance test apparatus

Growing community of inventors

Hsinchu, Taiwan

Chang-Ming Chen