Showing papers on "Gear shaping published in 2007"

Numerical computing method of noncircular gear tooth profiles generated by shaper cutters

Abstract: A simple and accurate numerical method was proposed for calculating the tooth profile of a noncircular gear. This method is directly based on the real gear shaping process, rather than deducing and solving complicated meshing equations used in the traditional method. The tooth profile is gradually obtained from the boundary produced by continuously plotting the cutter profile on the gear transverse plane. The key point of the method is picking up the graph boundaries. The relative position of the cutter profile on the gear transverse plane is determined by the given pitch line of the noncircular gear, parameters of the shaper cutter, and the shaping process data. In comparison with the traditional method, it is universal and is much more efficient and accurate, especially for noncircular gears, which have nontrivial pitch lines. Special problems in gear design and manufacturing, such as tooth pointing, undercut, and fillet interference, are included in the process. As an application example of the numerical method, a square internal gear is chosen from a new type of hydraulic motor with noncircular planetary gears, and the tooth profile of that gear is computed. The gear is successfully machined by electromagnetic discharge (EMD) using the resulting data.

Study on the Accuracy of Injection Molded Plastic Gear with the Assistance of Supercritical Fluid and a Pressurized Mold

Abstract: Plastic gears are lighter and less noisy compared to steel gears, and they can be easily shaped into diverse forms by the injection molding process. For this reason, plastic gears are widely used in industry. An extensive amount of research has been conducted on gear materials and methods of shaping plastic gears for durability and for broader applications. In this article, the focus is on producing a plastic gear shaping method incorporating the injection molding process. The most important factor influencing the durability of a plastic gear is its accuracy. Unlike steel gears, the dimensions of plastic gears are subject to considerable change during formation, and this is due to certain conditions during the injection molding process and to the mold structure. The main causes of size variability here are the high viscosity of plastic and the shrinkage ratio of the resin. In our study, a supercritical fluid was used to reduce the viscosity of the plastic, and a pressurized mold was used to control the sh...

Involute straight-teeth conical gear shaping method

Abstract: This invention discloses an involute gear shaping technique which includes the following processes: establish theoretic involute for the gear by CAD software; confirm the drum shaped size and maximum tooth profile; shape any one of the conjugate gears; shape the tooth profile of three-dimensional model of the above conjugate gears; convert the three-dimensional model to numeric control code and input to machine tool for machining. This invention simplifies traditional taper gear shaping technique. It reduces vibration & yawps in joggling and prevents edge effect.

High precision numerically controlled gear shaping machine

Abstract: A high accuracy numerical control gear shaper, which compises a lathe bed; a tool rest unit for processes the gear; a numerical control system; a hydraulic system, the lathe bed comprises an upper supporting work table and a mid lathe bed lower lathe bed, an upright column connected on the lathe bed; the lower lathe bed has a level migration level shifting mechanism which can make the lathe bed to drive the upright column; the tool rest unit is in the pulling mechanism, a vertical shifting mechanism and an automatic loosening and clamping mechanism are arranged between the pulling mechanism and the upright column. The utility model has the beneficial effect that the utility model main movement, circular motion, tooth dividing movement and radial direction feed motion can realize the stepless speed change, can automatically control the cutting tool traveling schedule and position, the electron cutter relieving can be realized between the main movement and the cutter relieving movement. The slotting cutter can be fast replaced. The work table rotation axle, the cutter bar rotation axle, the lathe bed longitudinal shifting shaft, the cutter bar vertical reciprocation motive axle, the cutter relieving movement axle, the vertical shifting shaft and the stroke length automatic regulating shaft are can be controlled accurately, guaranteeing the high bed automatization.

Gear shaping machine

Abstract: A gear shaping machine for the manufacture or machining of gears having a shaping tool and a shaping head bearing the shaping tool, where the shaping head is movable transversely to the shaping direction for the delivering and lifting of the shaping tool to the workpiece. A direct drive is provided for this purpose which moves the shaping head transversely to the shaping direction. Furthermore a corresponding method for the manufacture or machining of gears is described.

Shaping back taper gear apparatus of gear shaping machine

Abstract: The utility model discloses a back taper gear machining device for gear shaping machines The device mainly includes a platform seat, a rotary shell and a transmission chain The rotary shell may be rotated around the platform seat through a rotary support shaft, the transmission shaft is connected with the rotary support shaft through a bevel gear, and the rotary support shaft is connected with the shaft through fitted gear unit The rotary support shaft fitted with the rotary shell can precisely ensure position of the engaging center of the transmission gear, ensure the transmission chain not interfered after rotation, and ensure machining precision of the back taper gear

Gear shaping machine tow-way tool retracting device

Abstract: The utility model discloses a gear shaper double-direction tool recession device belonging to the gear shaper parts. The utility model mainly includes a crank shaft and a cutter shaft; the crank shaft is connected with a journey shaft and is arranged with an in-phase belt wheel which is connected with the in-phase belt wheel by an in-phase belt. The in-phase belt wheel is connected with a tool recession cam and some tool recession rollers are arranged at two sides of the in-phrase belt wheel. By virtue of the mutual cooperation of two in-phrase gears, a tool recession cam and two tool recession rollers, the utility model implements the tool recession action when gear shaper is inserting the internal gear and the external gears, precisely guarantees the in-phrase of the seesaw motion of the tool recession and the cutter shaft, simplifies the structure of the machine tool and reduces the cost of the whole machine.