Popular science knowledge of the hottest gear proc

2022-09-23
  • Detail

Gear processing machine tools are machine tools for processing the teeth of various cylindrical gears, bevel gears and other toothed parts. There are many kinds and specifications of gear processing machine tools, including small machine tools for processing gears with a diameter of several millimeters, large machine tools for processing gears with a diameter of more than ten meters, as well as high-efficiency machine tools for mass production and high-precision machine tools for processing precision gears

Gear processing machine tools are widely used in various machinery manufacturing industries such as automobiles, tractors, machine tools, engineering machinery, mining machinery, metallurgical machinery, petroleum, instrumentation, aircraft and spacecraft

ancient gears were formed by hand filing. In 1540, when making clocks and watches, toriano of Italy made a tooth cutting device using a rotary file; In 1783, Rene of France made a gear processing machine with a milling cutter and accessories for cutting rack and internal gear; Around 1820, white of England manufactured the first machine tool that can process both cylindrical gears and bevel gears. Machine tools with this performance developed again in the second half of the 19th century

herringbone gear of the Eastern Han Dynasty unearthed in 1953

in 1835, Whitworth of England obtained the patent of worm gear hobbing machine; In 1858, Schiller obtained the patent of cylindrical gear hobbing machine; After many improvements, the problem of processing helical gears was successfully solved when pford, Germany, made a hobbing machine with differential mechanism in 1897. After being made into a gear shaper cutter, filos of the United States made a gear shaper in 1897

at the beginning of the 20th century, due to the needs of the automotive industry, various gear grinding machines came out one after another. It was made into a shaving machine in the United States around 1930; It was made into a gear honing machine in 1956. Since the 1960s, modern technology has been applied to some advanced cylindrical gear processing machines, such as using digital display to indicate the movement and cutting depth on large machine tools; In hobbing machine, gear shaper and gear grinder, electronic servo system and numerical control system are used to replace mechanical transmission chain and exchange gear; The programmable controller with fault diagnosis function is used to control the working cycle and change cutting parameters; Developed digital control non-circular gear shaper and adaptive control hobber; The electronic sensor is used to detect the motion error of the transmission chain on the gear hobbing machine and automatically feed back and compensate the error

in 1884, Bill gram of the United States invented a straight bevel gear planer processed by the single planer according to the generating method; In 1900, bill of the United States designed a machine tool with double cutter heads for milling straight bevel gears

due to the needs of the automotive industry, a straight bevel gear planer with two planers was manufactured in the United States in 1905, and a spiral bevel gear milling machine was manufactured in 1913; In 1923, the quasi involute bevel gear milling machine appeared; In the 1930s, a gear puller capable of broaching straight bevel gears into shape at one time was developed, which is mainly used for the manufacture of automotive differential gears

40 the consequences will be very serious. In order to meet the needs of the aviation industry, the spiral bevel gear grinding machine was developed. In 1944, the Swiss erikon company made the extended epicycloid bevel gear milling machine; Since the 1950s, a gear milling machine with double cutter body combined end milling cutter head has been developed to process extended epicycloid bevel gears

gear shaping machining diagram

gear processing machine tools are mainly divided into two categories: cylindrical gear processing machine tools and bevel gear processing machine tools. Cylindrical gear processing machine tool is mainly used to process various cylindrical gears and racks, which can basically meet the requirements of ordinary plastic raw material processing and plastic waste processing and forming, worm gear. Commonly used gear hobbing machine, gear shaping machine, gear milling machine, gear shaving machine, etc

gear hobbing machine uses hobs to rough and finish straight teeth, helical teeth, herringbone gears and worm gears according to the generating method, with a wide range of processing, which can achieve high precision or high productivity; Gear shaper uses gear shaper cutter to process spur gear, helical gear and other tooth shaped parts according to generating method, which is mainly used to process multiple gears and internal gears; Gear milling machine is processed by forming milling cutter according to indexing method, which is mainly used to process instrument gears with special tooth shape; Gear shaving machine is a high-efficiency machine tool that uses gear shaving cutter to finish machining gears; Gear grinding machine is a high-precision machine tool that uses grinding wheel to finish machining hardened cylindrical gear or gear cutter tooth surface; Gear honing machine is a machine tool that uses the free meshing of honing wheel and machined gear to eliminate the burrs of hardened gears and other tooth surface defects; Gear extruding machine is a machine tool that uses the free meshing of the extruding wheel with high hardness and no cutting edge with the workpiece to grind the tiny unevenness on the tooth surface to improve the accuracy and smoothness; Due to the significant conjugate effect of teeth, the gear chamfering machine is a machine tool for rounding the tooth ends of sliding gears engaged internally and externally. It is an indispensable processing equipment for the production of gear boxes and other gear shifting mechanisms. Cylindrical gear processing machine tools also include gear hot rolling mill and gear cold rolling mill

schematic diagram of straight bevel gear transmission

bevel gear processing machine tools are mainly used to process the teeth of straight teeth, helical teeth, spiral teeth, extended epicycloid teeth and other bevel gears

straight bevel gear planer is a machine tool that roughens and refines straight bevel gears with paired gear planers according to the generation method. Some machine tools can also plane helical bevel gears, which is most widely used in small and medium-sized batch production

the double cutter head straight bevel gear milling machine uses two milling cutter heads with staggered cutter teeth to mill the left and right tooth surfaces in the same tooth groove according to the generation method, which has high production efficiency and is suitable for batch production. Due to the relative movement between the milling cutter head and the workpiece in the non tooth length direction, the bottom of the milled tooth groove is in a circular arc, and the processing module and tooth width are limited. This machine tool can also be equipped with automatic loading and unloading devices to realize single machine automation

the straight bevel gear pull milling machine is a machine tool that cuts a tooth slot from the solid wheel blank by forming method in the rotation of a large-diameter pull milling cutter head. It is the most productive machine tool in bevel gear cutting machine tools. Because the cutting tools are complex and expensive, and each kind of workpiece requires a special cutter head, it is only suitable for mass production. Machine tools are generally equipped with automatic loading and unloading devices

spiral bevel gear milling machine is a machine tool that rough and finish machining spiral bevel gears and hypoid gears with spiral bevel gear milling cutter head according to the generation method, and has variants such as precision cutting machine, rough cutting machine and gear drawing machine

spiral bevel gear grinding machine is a machine tool used to grind hardened spiral bevel gears to improve accuracy and smoothness. Its structure is similar to spiral bevel gear milling machine, but it uses grinding wheel instead of milling cutter head, and is equipped with grinding wheel dresser, which can also grind hypoid gears

extended epicycloid bevel gear milling machine is a machine tool that uses extended epicycloid bevel gear milling cutter head, or double cutter body combined end face milling cutter head, and continuously divides and cuts teeth according to the generation method. During gear cutting, both the milling cutter head and the workpiece make continuous rotation movement, while the table makes feed movement to process a workpiece, and the table reciprocates once. The continuous rotation of the milling cutter head and the workpiece enables the workpiece to obtain continuous indexing of a certain number of teeth and form a tooth length curve. The rotation of the shaking table is combined with the additional motion of the workpiece to produce generating motion, so that the workpiece can obtain the tooth shape curve

taper hob for quasi involute bevel gear milling machine is a machine tool that continuously divides and cuts teeth according to the generation method. When cutting teeth, the taper hob first cuts at the big end, and then cuts at the end with its smaller diameter. In order to ensure the consistent cutting speed in the whole cutting process, the machine tool controls the speed of the hob by means of a stepless speed change device. When cutting teeth, the shaking table, the hob and the workpiece all make continuous rotation movement, machining a workpiece, and the shaking table reciprocates once. The rotation of the shaking table and the workpiece generates generating motion through the differential mechanism, so that the workpiece can obtain a tooth profile curve with equal height along the tooth length

the supporting equipment of the bevel gear processing machine tool includes a grinding machine for grinding the cutting edges of the milling cutter head and broach head, a gear lapping machine for lapping the paired bevel gears, a bevel gear rolling inspection machine for checking the meshing contact of the paired bevel gears, and a quenching press to prevent the deformation of the tooth after heat treatment. (e standard is upper space stretching nd)

Copyright © 2011 JIN SHI