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2225results about "Driving apparatus" patented technology

Large gantry polar-coordinate digital-control milling, hobbing and grinding gear combined machine

The invention relates to a large gantry polar-coordinate digital-control milling, hobbing and grinding gear combined machine adopting a beam both-side bearing structure by respectively hanging a milling gear headstock and a hobbing and grinding gear headstock at the left side and the right side of a beam. Compared with the prior art, the invention adopts the design concepts of polar coordinates and modularization and enables the connection sizes of lathes, bases, and the like as well as Y-direction and Z-direction feeding systems of a milling gear and a hobbing and grinding gear to have interchangeability, thereby decreasing the manufacture cost, lowering the assembly difficulty and improving the machining precision and the machining efficiency of large-module large-diameter gears. The invention integrates the machining characteristics for roughly and finely machining a milling gear, precisely spreading into a hobbing gear and molding a grinding gear with respective optimal process velocities and reasonably arranges a milling, hobbing and grinding gear headstock transmission chain capable of satisfying the requirements for molding the milling gear, spreading into the hobbing gear and molding the grinding gear.
Owner:NANJING UNIV OF TECH

Three-dimensional elliptical vibration cutting device

The invention relates to a three-dimensional elliptical vibration cutting device, belonging to the field of cutting and ultra-precision cutting machining of materials which are difficult to machine. A diamond cutter is guided through flexible hinge mechanisms respectively along an X direction, a Y direction and a Z direction, and further, is driven by three piezoelectric stacks respectively alongthe X direction, the Y direction and the Z direction; the piezoelectric stacks of the X direction and the Z direction are preloaded by preloading screw bolts along respective axial direction; the piezoelectric stack of the Y direction is preloaded through a screw bolt screwing wedge; the preloading processes of the three directions are mutually independent; through regulating and matching the initial phase position and the amplitude of a driving signal for each of the three piezoelectric stacks, the projections of the cutter location point movements of the diamond cutter in an X-Y plane and aY-Z plane are elliptical motions, and the projection of the cutter location point movements of the diamond cutter in an X-Z plane is reciprocating elliptical motion or linear motion. The three-dimensional elliptical vibration cutting device has a novel and simple structure, is easy to implement, and is beneficial to obtaining the best cutting machinability of the diamond cutter.
Owner:HUAWEI TEHCHNOLOGIES CO LTD

Large-scale numerical control gear machining machine tool

The invention provides a large-scale numerical control gear machining machine tool which has six numerical control coordinate axes, namely X, Y, Z, A, C1 and C2 and adopts a two plus four layout manner. A workpiece has two freedom motion, namely linear motion along the X axis and rotational motion around the C1 axis; and a tool has four freedom motion, namely linear motion along the X axis and the Z axis and rotational motion around the A axis and the C2 axis. The large-scale numerical control gear machining machine tool adopts a six-axis (X, Y, Z, A, CI and C2 axis) five-linkage (X, Y, Z, A and C2 axis linkage) structure; the five numerical control coordinate axes, namely the X, Y, Z, A and C2 axes carry out interpolation motion; and the indexing movement of the workpiece is controlled by the C1 axis to process all tooth surfaces. The rotational axis of the workpiece, namely the C1 axis only finishes the indexing movement and does not participate in the interpolation motion formed bythe tooth surfaces so as to improve the processing precision and the processing efficiency of a large-scale gear. The large-scale numerical control gear machining machine tool can be constructed intoa gear miller or a gear grinder, thereby realizing the curved surface machining of a cylindrical gear, a bevel gear, an impeller and others with the indexing features.
Owner:秦川机床工具集团股份公司

Method for operating an electrical power tool, and a drive unit for an electric power tool

The invention relates to a method for operating a handheld electric power tool, having an electric motor that is drivable at a rated torque as the maximum allowable motor torque by the application of a maximum allowable motor current. The method includes the steps of manually furnishing a specification of a maximum torque, in which the maximum torque is within a setting range between a minimum set torque and the rated torque, operating the electric motor by applying a motor voltage which corresponds to an rpm desired by the user, and limiting the motor current to a current value that depends on the furnished specification of the maximum torque.
The invention also related to a drive unit for an electric power tool, which includes an electric motor drivable at a rated torque as a maximum allowable motor torque by application of a maximum allowable motor current. A setting element manually furnishes a specification of a maximum torque, the maximum torque being within a range between zero and the rated torque. A triggering unit operates the electric motor by applying a motor voltage that corresponds to an rpm desired by the user. A motor controller limits the motor current to a current value that depends on the furnished specification of the maximum torque.
Owner:ROBERT BOSCH GMBH

End effector for forming holes for aircraft assembly and using method thereof

The invention relates to an end effector for forming holes for aircraft assembly, wherein the end effector is combined with an industrial mechanical arm. The end effector comprises a spindle-feeding module, a dual-eccentric-disk posture adjusting module, a scrap sucking and pressing module, a normal detection module and a visual detection module. The spindle-feeding module comprises a spindle motor, a feeding motor, a ball screw, a drill and the like and achieves the hole drilling function. The dual-eccentric-disk posture adjusting module comprises a posture adjusting motor, a large eccentric disk, a small eccentric disk and the like and achieves the drill posture adjusting function. The scrap sucking and pressing module comprises a pressing air cylinder, a pressing head and the like and achieves the workpiece pressing function and the drilling and cutting scrap sucking function. The normal detection module comprises a laser sensor and the like and achieves the function of calculating the normal direction of a hole forming point. The visual detection module comprises an industrial camera and the like and achieves the function of displaying the hole forming effect in real time. After the end effector is combined with the industrial mechanical arm, the error of perpendicularity of a hole in the hole forming process can be smaller than 0.5 degree, and according to the hole forming efficiency, five to six holes can be formed per minute. Not only is the hole forming quality for aircraft assembly improved, but also labor force is greatly reduced.
Owner:SHANGHAI AIRCRAFT MFG +1

Ultra-sophisticated aerostatic motorized spindle system

The invention provides an ultraprecise aerostatic electric spindle system which relates to an electric spindle system. The invention solves the problems that in the spindle system of current ultraprecise processing devices, rotation accuracy is poor; direct drive can not be realized and transmission effects of the power of an electric motor and a spindle are unfavorable. A motor shaft (14) on a DC brushless drive motor (15) is fixedly connected with the upper end face of an upper thrust plate (3); the spindle (4) and a spindle sleeve (5) are positioned between the upper thrust plate (3) and a lower thrust plate (6); the spindle sleeve (5) is sleeved on the spindle (4); the lower end face of the upper thrust plate (3) is fixedly connected with the upper end face of the spindle (4); the lower end face of the spindle (4) is fixedly connected with the upper end face of the lower thrust plate (6). The motor shaft (14) and the spindle (4) are coaxial; the spindle sleeve (5) is opened with a plurality of radial restriction orifices (8-1) and a plurality of axial restriction orifices (8-2). In the invention, an aerostatic bearing is used as an axial support and a radial support, which guarantees the rotation accuracy of the spindle; the aerostatic bearing has the effect for homogenizing the geometric accuracy of the spindle and the spindle sleeve so that shafting has extremely high rotation accuracy.
Owner:HARBIN INST OF TECH

Intelligent detection and active inhibition device for fluttering of high-speed milling electric spindle

The invention discloses an intelligent detection and active inhibition device for fluttering of a high-speed milling electric spindle. According to the device, in the milling process, a vibration signal of a spindle tool handle is collected in real time through built-in acceleration sensors, built-in displacement sensors and an external data collection and analysis meter; the acceleration vibration signal is analyzed in real time through a modern signal processing method, so that intelligent detection of milling fluttering is achieved; and if fluttering occurs, the vibration information collected by the displacement sensors is transmitted into an FPGA controller, the controller carries out adaptive optimization, a driving signal is output, a piezoelectric actuator is driven by a power amplifier to operate, mutual offset of secondary vibration and machining vibration of the piezoelectric actuator is achieved, and intelligent and active inhibition of the fluttering is achieved. Visual displaying and monitoring of the state information, comprising vibration, displacement, temperature and the like, of the whole system can be achieved on a computer in real time in the machining process. The intelligent detection and active inhibition device for the fluttering of the high-speed milling electric spindle can effectively improve milling stability, milling quality and milling efficiency.
Owner:XI AN JIAOTONG UNIV

Programmable intelligent electric spindle

The invention discloses a programmable intelligent electric spindle. The programmable intelligent electric spindle comprises a front bearing pedestal, a rear bearing pedestal, a spindle body, a motor rotor, a motor stator, a cooling water jacket, an actuation bearing, an annular pressing block, a tool handle, a controller, a cooling liquid input pipeline, a cooling liquid outlet pipeline and a shell of a hollow structure. An annular cavity is formed between the motor stator and the shell, and the cooling water jacket is arranged in the cavity; a plurality of first piezoelectric actuators are evenly arranged between the annular pressing block and the front bearing pedestal in a divided manner in the circumferential direction, and a plurality of grooves are arranged on the inner side of the rear bearing pedestal in the circumferential direction; second piezoelectric actuators are embedded in the grooves; an electromagnetic valve is arranged on the cooling liquid input pipeline; and the output end of the controller is connected with the control end of the electromagnetic valve, and the control ends of the first piezoelectric actuators and the control ends of the second piezoelectric actuators are connected. Vibration and shaft end deformation of the spindle body can be reduced, temperature rising of the spindle body is regulated and controlled, the structure is simple, and the requirements of parts for machining quality diversity can be met.
Owner:XI AN JIAOTONG UNIV
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