Showing papers on "Gear shaping published in 2004"

Cutting machine for gear shaping or the like

Abstract: A cutting machine (10) includes linear electrical actuation via a linear electrical motor (64) for controlling linear reciprocating movement of a spindale (12) and cutting tool (30). the cutting machine (10) is suited for gear shaping cutting operations and the like. Linear electrical actuation may be used to control position of a hydraulic valve (54) within the spindle (12), which controls hydraulic actuation and linear movement of the spindle (12). Linear electrical actuation, in the form of linear electrical actuator (104), and flexture plates (such as 22, 24) may also be used to pivot the spindle (12) to relieve the cutting and/or during the cutting stroke for gear crowning operations. A rotary actuator (138) is also disclosed as incorporated into the pivoting saddle (18) of such a cutting machine (10).

Computer aided stress analysis of fellow's gear-shaping cutter at different stages of a cutting stroke

Abstract: Achieving maximum efficiency (in terms of the quantity of products produced in a stipulated time) with improved accuracy and surface finish through chatter-free high-speed cutting processes are among the challenges of the current gear cutting industry. Modern techniques usually employ generating type of cutters, such as Fellow's gear-shaping cutter, for the production of high-speed low-noise accurate gears. A literature review has indicated that experimental and theoretical methods had been predominantly used in the design of gear cutting tools, compared with computer-aided methods. In this research a gear-shaping cutter for spur gears is modelled using three-dimensional ten-node tetrahedral finite elements. The stress values on the gear-shaping cutter are calculated at different instants of a cutting stroke, assuming different loading conditions. The analysis of stress distribution due to the varying force distribution on the gear cutter edges, for the same cutting and process parameters during the generation process, is believed to be new to the literature.

Computer aided stress and deflection analysis of Fellow's gear-shaping cutter, for different cutting process parameters

Abstract: Achieving maximum efficiency (in terms of quantity of products produced in a stipulated time) with improved accuracy and surface finish through a chatter-free high-speed cutting process are problems of the modern gear cutting industry. Modern techniques employ a generating type of cutter such as Fellow's gear-shaping cutter for the production of high-speed noiseless and accurate gears. The literature review indicates that experimental and theoretical methods had been predominantly in use in the design of gear cutting tools as compared to the computer aided methods. In this research the gear-shaping cutter is modelled using three-dimensional ten-node tetrahedral finite elements. The research is carried out at the instant when the gear-shaping cutter plunges on the workpiece and the cutting forces during the generation process become maximum. The maximum three-dimensional displacements and stress values are generated under different cutting conditions. The effects of different cutting process parameters (speed, feed and depth of cut) on the maximum stress and deflection are studied in detail.

Tool retracting device for combing-cutter gear shaping machine

Abstract: The utility model provides a cutter relieving device for a combing-cutter gear shaping machine, which is characterized in that a ram which can move up and down is arranged on an upright post of a gear shaping machine, a groove is arranged on the ram, and a cutter clamping body for placing a knife, which can lightly swing forwards and backwards is arranged in the groove; a geared sector which is engaged with a gear which is driven by frictional force is arranged on the upper end of the cutter clamping body, the other end of a gear shaft is provided with a driving gear, and the driving gear is engaged with a gear rack which is fixed on the upright post and is parallel to the moving direction of the ram. The device removes a cutter frame body which is arranged on the upright post and a cam drive mechanism which drives the cutter relieving device to move, and thus, the structure is greatly simplified, and the manufacturing cost is reduced. Additionally, the utility model also has the advantages of simple and convenient repair.