3246results about "Gear-cutting machines" patented technology

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.

A radius-forming dressing roll (32) having a frustoconical working region (48) and an adjoining concave-toroidal working region (49) is mounted on the dressing spindle (30) coaxially to a dressing disc (31). In a first step, the flanks (42, 43) of the grinding-worm thread are profiled with the disc (31). After the dressing spindle (30) has been pivoted, the two tip radii (46, 47) and the cylindrical outer circumference (45) are profiled with the dressing roll (32). With little resetting effort and high flexibility, the method permits profiling with short dressing times.

In a process for the profiling of a grinding worm (1) with at least two grinding width zones (4, 6) with differently modified thread profile for the grinding of spur and helical gears with three-dimensionally modified flank profile, the grinding width zones (4, 6) are arranged overlapping in order to gain optimum exploitation of the grinding worm width (3). In one variant, profiling of the grinding worm (1) is performed with an abrasive coated profiling gear (25) with a tooth flank geometry and facewidth differing from that of the workpiece to be ground. By suitable selection of the diagonal ratio and the allocation of the width zones (28, 29) of the profiling gear (25) to the grinding width zones (4, 6) of the grinding worm (1), it is possible to adapt the modifications of the grinding worm flanks to the requirements of the workpiece without having to alter the flank geometry of the profiling gear (25). In another variant the grinding worm (1) is profiled in a first stage across its entire width (3) with the desired profile form of the roughing zone, and in a second stage the finish grinding zone (36, 37) and the adjacent transition zones (34, 35) of the right and left flanks of the grinding worm (1) are finish profiled by means of NC controlled line by line profiling with a form dressing roll (40).

The invention discloses a thin-wall annular gear processing method which comprises the steps of forging, rough turning, tempering, half finished turning, finish turning and gear shaping, wherein the finish turning process comprises the steps of: taking the end surface of the thin-wall annular gear after half finished turning as a thrust surface, acting the axial force to fix the thin-wall annulargear on a horizontal lathe work bench, and then turning the inner wall and the outer wall of the thin-wall annular gear; and the gear shaping process comprises the steps of: using a fixture to simlutaneously fix the end surface and the outer wall of the thin-wall annular gear after finish turning, and then conducting gear shaping to the inner wall of the thin-wall annular gear. The thin-wall annular gear processing method can lead the thin-wall annular gear after processing to have small deformation, has high precision and high efficiency.

The invention discloses a main shaft device for a numerical controlled gear hobbing machine. The main shaft device comprises a cutter bar assembly, a cutter bar assembly clamping mechanism and a cutter changing mechanism, wherein the cutter bar assembly comprises a cutter bar, a hobbing cutter, a cutter regulating pad, an axle sleeve, a locking nut and a cutter bar blind rivet; the cutter bar assembly clamping mechanism consists of a square key and a claw assembly; and the cutter changing mechanism consists of a pull rod, a piston rod, a disc-shaped spring, a hydro-cylinder body, a flange plate, a bracket, a rotary joint and a spacing switch. The main shaft device has the advantages that: a hydrostatic bearing is arranged in the main shaft structure of the high-accuracy numerical controlled gear hobbing machine, so the main shaft device can constantly work under a heavy-load cutting condition; a main shaft has high accuracy and good accuracy retaining ability; and the cutter bar assembly with the hobbing cutter is arranged and set outside a machine in a cutter workshop; the cutter bar assembly is subjected to whole cutter changing on the gear hobbing machine; and the setting assisting time of the hobbing cutter does not occupy the total part machining time of a machine tool, so the whole machine tool has high working efficiency.

In a first step for the purpose of precentering, the dressing too; (27), without axial movement, is brought into contact with the circumference of the rotating grinding worm (11), and those rotary-angle positions of the grinding worm (11) at which the overrunning of the thread gap (36) starts of ends are determined by means of an acoustic-sensor signal and the shaft-angle encoder (18) of the grinding spindle (16). In a second step for the purpose of precision centering, the dressing tool (27) fed into the thread gap (36) is brought into contact with the left-hand and right-hand tooth flanks (38, 39) by axial displacement. In this case, the axial infeed is stopped by means of the acoustic-sensor signal, and the exact grinding-worm thread center is calculated from the contact positions of the dressing tool (27) achieved.

A precision grinding apparatus includes a grinding worm for precision grinding a case-hardened face gear. A shaper is first placed into contact with a face gear, to thereby shape a surface of the face gear into a plurality of face gear teeth. The shaper is then removed, and the face gear is case hardened. The grinding worm is disposed in a normal orientation to the case-hardened face gear and includes a spiral tooth extending along a perimeter of the grinding worm. The spiral tooth of the grinding worm is adapted to contact and precision grind the case-hardened gear. A dressing tool includes a protrusion for contacting the spiral tooth of the grinding worm, as the spiral tooth contacts and precision grinds the case-hardened face gear. The dressing tool thus maintains the shape of the grinding worm to within a desired tolerance range.

The present disclosure relates to a method for the manufacture of a workpiece having a corrected gear geometry and/or a modified surface structure, in particular by a hard finishing process, in particular generation grinding or honing. Provision is made in this respect that it is achieved by a direct generation of a wobble movement and/or of an eccentricity of the tool that a modification, in particular a profile modification or profile waviness, and/or a defined periodic flank waviness is generated on the active surface of the workpiece machined therewith.

A method for dressing a grinding worm that is to be used in forming a conical face gear that meshingly engages a conical involute pinion. The method employs true conjugate action between a theoretical conical involute pinion and a conical face gear to accurately position a dressing tool relative to a grinding worm.

A gear grinding machine, a method for dressing a threaded grinding wheel, and a method for grinding a work are disclosed. A dressing tool is rotated in a vertical plane, with its position being fixed. The position of a threaded grinding wheel is NC-controlled, whereby the dressing tool is brought into contact with the starting point of the thread of the threaded grinding wheel at a somewhat lower surface of the circumferential surface of the threaded grinding wheel and, in accordance with the rotation of the threaded grinding wheel, the position of contact of the dressing tool with the threaded grinding wheel is moved along the circumferential surface of the threaded grinding wheel.

To correct the tooth profile error of a ground gear, the wheel angle of a threaded grinding wheel is modified by dressing the threaded grinding wheel by a dressing device. To correct the helix form deviation of a ground gear, namely, to modify the helix angle of the gear, synchronization between the moving motion in the Z-direction of the threaded grinding wheel and the rotary motion of a table for installation of the gear is adjusted. When the helix form deviation is corrected by adjustment of the synchronization, a tooth profile change inevitably occurs. In consideration of the tooth profile change, correction of the tooth profile error by dressing is made.

The invention relates to a four-axis and four-linkage numerical control generating machine of arc bevel gear and belongs to the field of the gear generating machine technology. The invention comprises a machine body, a workpiece box and a cutting tool box. The machine body is fixedly provided with a straight guide rail of Z-axis and a straight guide rail of X-axis. The straight guide rail of X-axis drives a saddle to do the straight line motion via a servo motor. The saddle is provided with a workpiece box and rotates around a rotary shaft to do the rotary motion of B-axis for adjusting the required cone angle of gear root. The workpiece box is provided with a workpiece spindle which is driven by the servo motor to do the rotary motion of A-axis. The straight guide rail of Z-axis drives a vertical column to do the straight motion of Z-axis via the servo motor. The vertical column is fixedly provided with a straight guide rail of Y-axis which drives the cutting tool box to do the straight and reciprocating motion in the vertical direction of Y-axis via the servo motor. The main motor on the cutting tool box drives the cutting tool disk which is provided with the cutting tool to rotate for doing the rotary motion of C-axis of gear cutting. The four-axis and four-linkage numerical control generating machine of arc bevel gear has the advantages of simple structure, humanized layout, convenient loading and unloading of the workpiece, good dynamic rigidity and dynamic balancing, and small occupied area.

The present invention relates to a method for hard-fine machining of tooth flanks with corrections and/or modifications on a gear-cutting machine, wherein respective toothed wheel pairings which mesh with one another within a transmission or a test device are machined while taking account of the respective mating flanks, and wherein the tooth flanks of the relevant workpieces are provided with periodic waviness corrections or waviness modifications. In accordance with the invention, the rotational error extent is determined by means of rotational distance error measurement of the toothed wheel pairs in a gear measuring device and/or transmission. This measurement result serves as an input value for defining the amplitude, frequency and phase position for the periodic flank waviness corrections on the tooth flanks of the toothed wheel pairings for production in the gear-cutting machine.

A radial coordinates digital control highly effective milling machine, hobbing composite machine, can improve machining efficiency 3-5 times, saving 50% budget, reducing land occupation 30%, with it composed of body, vertical post, horizontal feeding carriage, rotary working bench, highly effective milling and hobbing main shaft box module, with the vertical post on the body, rotary working bench fixed on the horizontal feeding carriage, highly effective milling and hobbing main shaft box module vertical to the feeding carriage. Through digital control interpolation and electronic gear box software, it realizes digital control machining.

The present invention relates to one kind of intelligent measuring and regulating instrument for assembled milling cutter machining spiral bevel gear. Technologically, the intelligent measuring and regulating instrument includes one height measuring head with one digital dial gauge mounted in the end of the horizontal oscillation arm, and one radial measuring head with one digital dial gauge coaxially with the height measuring head. The measured data is stored, analyzed and processed in a computer and the processed result is shown in a display screen. The present invention can raise the milling cutter measuring and regulating precision and efficiency, and has simple structure and low manufacture cost.

The invention provides a large high-accuracy gear composite grinding center. An outer tooth grinding function module is arranged on the right of a rotation work table and comprises a tool body, a column, a grinding wheel frame, a grinding wheel dressing unit, an outer tooth grinding unit and an on-machine measuring unit. An inner tooth, inner hole and end grinding function module is arranged on the left of the rotation work table and comprises a tool body, a column, an inner hole and end grinding unit and an inner tooth grinding unit. By means of the grinding center, one-step clamping of large gears is achieved, the tooth face, inner hole and end grinding and accuracy detection are completed; the problems that large gears are difficult to hoist, clamp, correct and detect, the machining cost is high, the production efficiency is low, the accuracy is hard to guarantee are solved; assisting time among processes is shortened greatly, the number of tools and clamps is reduced, the machining period is shortened, the operation area is saved, the economic benefit is improved apparently, and the traditional machining mode of large gear production through a plurality of large tools and gear measuring instruments is changed completely.

In a gear cutting simulation method and device, a gear-cutting-machine model which specifies relative positions between a blank model and a cutter model is created. A gear model is created as a result of simulation of gear cutting which is performed with the blank model and the cutter model arranged in the gear-cutting-machine model.

The present invention provides a method of detecting and preventing grind burn from developing on a gear. The method includes performing acoustic emission testing while the gear is being ground during a grinding operation. The grinding wheel is evaluated during an eddy current test to detect material buildup on the grinding wheel which could cause grind burn. In addition, the method includes collecting swarf from the gear during the grinding operation and inspecting the swarf for an indication of grind burn.

The invention discloses a gear grinding machine with a numerical control forming grinding wheel; the grinding wheel comprises a stand which is provided with a horizontal sliding guide rail and a longitudinal sliding guide rail; a work piece rotary part is slidably assembled on the longitudinal sliding guide rail in a guiding way; a vertical column is slidably assembled on the horizontal sliding guide rail in a guiding way; and a grinding mechanism which is used for grinding a processed gear is slidably assembled on the vertical column in a guiding way along a vertical direction. The gear grinding machine with the numerical control forming grinding wheel also comprises a grinding wheel forming and finishing device which finishes a grinding wheel; the grinding wheel forming and finishing device comprises a finishing device base which is independently assembled on the vertical column above the grinding mechanism and a finishing wheel with the axis extending along a longitudinal direction; and the finishing wheel is slidably assembled on the sliding guide rail of a longitudinal finishing device of the finishing device base through a finishing wheel frame which extends outwards in a guiding way. According to the gear grinding machine with the numerical control forming grinding wheel, the problems of the prior art that the processing surface of the grinding wheel cannot be finished to be consistent with the shape of the gear slot of the processed gear, and the precise of the processing gear and the processing efficiency of the gear with a large specification are affected are solved.

The invention relates to a numerical control curve-tooth bevel gear grinder, which comprises a lathe bed, and is characterized by also comprising an upright post, a grinding wheel main shaft box, a workpiece main shaft box, an electric turntable, a grinding wheel correcting mechanism and a numerical control system. The lathe bed in the horizontal direction is provided with linear guide rails vertical to each other, the upright post and a bed saddle are arranged on the linear guide rails respectively, and an upright post automatic moving mechanism is arranged between the bottom of the upright post and the lathe bed; one lateral surface of the upright post is provided with the linear guide rail and the grinding wheel main shaft box, and the same side of the upright posts close to the top is provided with a moving mechanism for driving the grinding wheel main shaft box to move; and the bed saddle is provided with the electric turntable which is provided with the workpiece main shaft box on which the grinding wheel correcting mechanism is arranged. The numerical control curve-tooth bevel gear grinder has the advantages that the grinder simplifies the prior mechanical transmission, shortens adjusting time of a machine tool, has compact and reasonable structure, accurate processing with high accuracy, high automation degree to remarkably improve processing efficiency, and has low manufacturing cost to relieve economic burden of enterprises.

A method for lapping the gears of a gear set as well as a gear lapping system. The gear set generally includes a first gear in meshed engagement with a second gear, each of the first and second gears having a plurality of gear teeth each with drive and coast flank surfaces. The method includes the steps of lapping the gear set by rotating the first gear in a first direction while the first gear is in mesh with the second gear. The method further includes sensing the vibrations occurring in the gear mesh during rotation and controlling the step of lapping based on the sensed vibrations. The gear lapping system includes an automated lapping machine that is adapted to lap the gear set including a ring gear and a pinion gear. The automated lapping machine is adapted to lap the gear set by rotating at least one of the ring and pinion gears while in mesh, in the presence of a lapping compound, and while translating the gear mesh back and forth across the gear flank surfaces for a plurality of cycles. A vibration sensor is operably coupled to the automated lapping machine and senses the amplitude of vibration and energy occurring in the gear mesh during each of the plurality of cycles. This sensor produces a vibration output signal that is proportional to the amplitude of the vibration energy. An automated controller is adapted to receive the vibration output signal as well as to calculate and transmit a control command signal to the automated lapping machine based on the amplitude of the vibration energy.

An internal gear shaving machine 1 which brings a shaving cutter 3 and an internal gear held by a workpiece chuck 2 into engagement with a crossed axes angle, and subjects the tooth flanks of the internal gear to final machining while it rotationally drives at least one of the shaving cutter 3 and the workpiece chuck 2. The workpiece chuck 2 and shaving cutter 3 are supported movably toward and away from each other in a vertical direction with the workpiece chuck 2 higher and supported movably in the horizontal direction relative to each other. The workpiece chuck 3 is constituted to hold the outer circumferential surface of the internal gear with the axis of rotation of the internal gear oriented in a up-down direction so that shavings produced during processing by the shaving cutter can fall downwardly from the internal gear.

A precision grinding apparatus for grinding face gears having a gear table portion controllably driven for rotation about a central axis, and also being movable in a vertical plane along an axis in a controlled manner. The apparatus further includes a case hardened face mounted on the gear table portion. A grinding wheel mounted on the apparatus has controlled driven rotation about a central axis C, and is provided with a grinding surface of predetermined shape. The grinding wheel is movable in a controlled manner toward and away from the gear along a feed axis V, the grinding wheel being movable in a controlled manner in a tangential direction with respect to the gear and orthogonal to the feed axis along a tangential feed axis wherein the motion of the grinding wheel in the C, V and TF axes, and movement of the gear in B and W axes, is controlled by a central control means.