The invention relates to a device (50) for green machining bevel gears, comprising an CNC machining station (60) for gear cutting a wheel blank (K2). The machining station (60) comprises a tool spindle (61) which is used to receive a gear cutting tool (62) and a work piece spindle (33; 63) which is used to receive the wheel blank (K2). Said machining station (60) also relates to a machining station which operates in a vertical manner. Said device (50) also comprises a vertically processing station (70) which comprises a tool holder (73) and a work piece spindle (72) which is used to receive a work piece blank (K1). Said machining station (60) mechanically forms a functional unit together with the pre-machining station (40; 70), wherein the work piece blank (K1) undergoes green machining in the pre-machining station (70), in order to transfer to the first machining station (60) after the first green machining as a wheel blank (K2) and then it is to be cut. Said machining station (60) and the pre-machining station (70) are linked together in terms of data and control.

Device and method for green machining bevel gears

The invention concerns a process for the aligning of the tooth spaces of workpieces ( 1 ) with precut teeth, which are set up for fine machining on the work spindle ( 2 ) of a gear finishing machine. In order to avoid the trend related occurrence of out-of-tolerance aligning errors as series production progresses, teach-in cycles are performed on the workpiece machined in the immediately preceding machining cycle, called for automatically after time intervals or machining cycle intervals which are either pre-defined or calculated by the machine control system. By this means any prevailing trend errors are restored to zero.

Process and device for the aligning of workpiece with pre-cut teeth on gear finishing machines

A work piece having edges comprising teeth, slots, dovetail, keyway or other irregularly shaped artifacts, can be provided with a uniform chamfer around the periphery of the work piece by bringing a grinding wheel or cutter in one single down feed at indexed intervals. The shape or profile of the grinding wheel or cutter is formed from an algorithm depending on the shape and dimensions of the work piece artifacts, such as gear teeth, etc., to provide the uniform chamfer at each slot of, for example, an internal or external gear wheel. A method of providing such a chamfer on irregularly shaped artifacts comprises forming a gear grinding wheel from the dimensions of the desired chamfer, and providing a chamfering tool or grinding wheel in accordance with an algorithm desired for the required chamfer, then bringing the gear chamfering tool in proximity to, and in contact with the edges of the work piece so as to produce a uniform chamfer on the sides and back edge. The method may include a step of moving of the cutter or grinding wheel from one side to another and tilting the cutter or grinding wheel to chamfer the back side.

Chamfering cutting tool or grinding wheel and method of making and use thereof

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.

Main shaft device for numerical controlled gear hobbing machine

A rotation processing machine includes a rotating device supporting a cylindrical workpiece via a rotation support jig; a processing device on which a cutting tool is mounted; and a turning loader that has grippers arranged about a turning central axis and that turns so that the grippers sequentially face the rotating device. The grippers are configured to individually move up and down, and a height position of each gripper is settable to a first height position where the gripper delivers and receives the cylindrical workpiece to and from the rotating device, and a second height position where the gripper delivers and receives the rotation support jig to and from the rotating device. The turning loader turns each of the grippers between an external delivery/reception position where the gripper faces an external transfer stand and an internal delivery/reception position where the gripper faces the rotating device, and is configured to set the gripper to the first or second height position at one of the external delivery/reception position and the internal delivery/reception position, and to turn the gripper to the other delivery/reception position while holding the gripper at the set height position.

Rotation processing machine

PROBLEM TO BE SOLVED: To prevent deterioration of accuracy due to thermal deformation from generating even if dry cut is executed by controlling a feed means for cutting-in so as to change the cutting-in quantity of a gear hob during working, in a gear hobbing machine cutting gear profile without using cutting fluid. SOLUTION: Rotation of a table 26, rotation of a hobbing shaft 29, movement of a saddle 27 by a driving means 30 are carried out based on the command of a control device 31. The control device 31 sets the rotating speed of a hob 25 and a work 23 and the cutting-in quantity of the hob 25, so as to generate fixed gear profile on the outer circumference of the work 23. The thermal deformation quantity of the work 23 is previously input to the control device 31, and the control device 31 changes the cutting-in quantity of the hob 25 according to the thermal deformation quantity of the work 23. Cutting fluid is not supplied to the cut part during cutting. Hereby, even if dry cut is executed, deterioration of accuracy due to thermal deformation of the work 23 by working heat can be prevented from generating.

Gear hobbing machine

Gear cutting is to be effected in high efficiency and at low cost To this end, using a hob 16 coated with at least one layer of a film of a composition comprising: (Tisub(1-x) Alsubx)(Nsuby Csub(1-y)) 02≦x≦085 025≦y≦10, dry cutting is performed at a cutting speed in the range of 80 to 400 m/min without using a cutting oil Teeth can be generated at a greatly improved cutting speed without using any expensive tool such as a tool made of cemented carbide

Gear cutting method and apparatus

PROBLEM TO BE SOLVED: To surely discharge chips in tooth profile formation and to suppress the occurrence of so-called gouge by biting of chips by performing a hobbing by reverse winding conventional cut or an equal winding conventional cut SOLUTION: A high-speed tool steel hob 1 and a work 2 are mounted in a prescribed position of a gear hobbing machine, and the hob 1 and the work 2 are rotated in a rotating direction for forming equal winding conventional cut or reverse winding conventional cut The hob 1 is set to a rotating speed suitable for dry cut The hob 1 is brought into contact with the work 2 without supplying hydraulic oil to cut the work 2, and a tooth profile is formed In the equal winding conventional cut and reverse winding conventional cut, chips are originally hardly welded to the hob 1, and even if the chips are adhered to the hob 1, the chips are fallen while the hob 1 is rotated Accordingly, a gear can be formed without causing biting of chips or gouge

Gear machining method

PROBLEM TO BE SOLVED: To restrain the occurrence of chipping even when making use with the wear resistance maintained and without the machining speed lowered. SOLUTION: In a throwaway tip 2, at least one coat of film having a composition of (Ti(1-x) Alx ), (Ny C(1-y) ) [where 0.2<=x<=0.9, 0.5<=y<=1.0] is applied substantially to high speed tool steel. In addition, in a cutting method of doing cutting work by dry-cutting, the cutting is carried out with the tip 2 used and without coolant used. In this case, even if the tip 2 is used with the wear resistance maintained and without the cutting speed lowered, the occurrence of chipping can be restrained, while the drop in the productivity can be prevented, thereby removing the obstruction to reduction on the number of workers or to unmanning in the work lines.

Throwaway tip, machining method and device therefor

PROBLEM TO BE SOLVED: To provide a gear shaping method whereby a gear can be cut at low cost through dry cutting at high speed. SOLUTION: At least one film composed basically of AlOx (1.0<=x<=1.5) is subjected to dry cutting whereby it is cut by a pinion cutter 5 coated at least on its flank, at a cutting speed of 400 m/min or less without use of cutting fluid, to create a tooth profile. High-efficiency dry cutting gear shaping using the pinion cutter 5 that uses high-speed tool steel is achieved.

Nakamura Yozo

Papers

Gear hobbing machine

Gear cutting method and apparatus

Gear machining method

Throwaway tip, machining method and device therefor

Method for shaping gear