In February 1993, a contract was signed for the establishment of the joint venture Shanghai Siemens Mobile Telecommunications Co. Ltd. in Pudong’s Jinqiao export processing area. The signatories were the Shanghai Cha...In February 1993, a contract was signed for the establishment of the joint venture Shanghai Siemens Mobile Telecommunications Co. Ltd. in Pudong’s Jinqiao export processing area. The signatories were the Shanghai Changjiang Telecommunications Equipment (Group) Corporation and the Shanghai Posts and Telecommunications Administration Bureau, the First Institute of the Ministry of Posts and Telecommunications,展开更多
In this paper, eddy current sensors and thermocouple sensors were employed to measure the thermal field and thermal deformation of a spindle of a telescopic CNC boring-milling machine tool, respectively. A linear regr...In this paper, eddy current sensors and thermocouple sensors were employed to measure the thermal field and thermal deformation of a spindle of a telescopic CNC boring-milling machine tool, respectively. A linear regression method was proposed to establish the thermal error model. Furthermore, two compensation methods were implemented based on the SIEMENS 840D system by using the feed shaft of z direction and telescopic spindle respectively. Experimental results showed that the thermal error could be reduced by 73.79% when using the second compensation method, and the thermal error could be eliminated by using the two compensation methods effectively.展开更多
文摘In February 1993, a contract was signed for the establishment of the joint venture Shanghai Siemens Mobile Telecommunications Co. Ltd. in Pudong’s Jinqiao export processing area. The signatories were the Shanghai Changjiang Telecommunications Equipment (Group) Corporation and the Shanghai Posts and Telecommunications Administration Bureau, the First Institute of the Ministry of Posts and Telecommunications,
文摘In this paper, eddy current sensors and thermocouple sensors were employed to measure the thermal field and thermal deformation of a spindle of a telescopic CNC boring-milling machine tool, respectively. A linear regression method was proposed to establish the thermal error model. Furthermore, two compensation methods were implemented based on the SIEMENS 840D system by using the feed shaft of z direction and telescopic spindle respectively. Experimental results showed that the thermal error could be reduced by 73.79% when using the second compensation method, and the thermal error could be eliminated by using the two compensation methods effectively.
