齒輪加工英文版

1、Gear machining成員；朱世超 廖智成 胡敬豪 李瀅 Gear Type3Material selectionHeat treatmentTooth surface processingBlank selectionPart 1Part 2Part 3Part 41. Reasonable selection of gear materialsa. Mechanical properties of materials The gear material is required to have high bending fatigue strength and contact fati

2、gue strength. The tooth surface should have sufficient hardness and wear resistance. The tooth core should have definite hardness and toughness.b. Meet the processing properties of materials Material of the processing properties is that the material itself is able to adapt to a variety of processing

3、 requirements.c. Economic requirements for materials In the premise of meeting the use of properties, the selection of gear materials should also pay attention to minimize the total cost of parts.d. Basic requirements for gear materials： Hard tooth surface , tough tooth core Easy processing and heat

4、 treatment The matching hardness difference value of the tooth surface of the soft tooth surface gear is 30-50HBSBACK 2. Gear blanksThe choice of gear blanks depends on the material, structure, size, service conditions, production lot and other factors of gear.BACK3. Heat treatment method of steel g

5、ears mainly has the followingSurface hardening（表面淬火）Carburizing and hardening（滲碳淬火）Nitriding（滲氮）Conditioning（調(diào)質(zhì)）Normalizing（正火）BACK4. Tooth surface processing The key of gear machining is the machining of the tooth surface. At present, the main method of machining the tooth surface is tools cutting

6、and wheel grinding. The former is widely used in the processing of the tooth surface because of its high efficiency and high accuracy. The latter is mainly used for the finishing of the tooth surface, and the efficiency is generally low. In accordance with the principle of processing, can be divided

7、 into two categories and Fan Chengfa profiling method.1 The profiling method（仿形法）The profiling method is the forming cutter tooth shape processing method and by the gear groove. With gear milling cutter on the common milling machine tool is commonly used in the forming process. The milling a slot, d

8、ividing head will turn the gear blank 360 DEG /z, then milling a slot, until all the cogging mill.Disc milling cutterFinger type milling cutterMilling method In horizontal milling machine, gear blank set on the mandrel installation on dividing head and tailstock top cutter and milling depth after be

9、gan the first milling a slot milling finish out of a tooth indexing, followed by one by one to complete the number of teeth of the milling。videoMilling machining features（1） With ordinary milling equipment, and the low cost of cutting tools（2） Production efficiency is low. After each cutting a tooth

10、 to be graduated, take up more auxiliary time.（3） Production efficiency is low. After each cutting a tooth to be graduated, take up more auxiliary time.Characteristic：When generating the gear with, as long as the tool and the cut gear module and pressure angle of the same, regardless of what is the

11、number of teeth of gear machining, can use the same tools to process, which to the production brought great convenience, so generating has been widely usedthe use of a pair of gears without side clearance when the two wheel meshing with the principle of the envelope of the envelope line of processin

12、g gear. The motion of the cutter and the gear blank is like a pair of mutually engaged gears, and the final cutting tool will cut out the involute profile of the gear2. 范成法Principle： Common tool（1）Gear slotting cutter is a gear tooth profile for the blade；（2）Rack cutter is a profile for the blade ra

13、ck（3） Gear ber like trapezoidal thread of the screw, the axial section profile for precise straight tooth profile and hob rotates relatively to the rack in the mobile. Can achieve continuous processing, high productivityGear slotting cutter（齒輪插刀）backRack cutter（齒條插刀）backGear hob-ber（滾齒插刀）backSlottin

14、g process（插齒加工）Insert teeth are mainly used in the processing of straight teeth cylindrical internal, external teeth or multi gear, internal, external spline, etcThe movement of the teeth The working principle of the slotting machine is similar to a pair of cylindrical gears, one of which is a workp

15、iece, and the other is a gear cutting tool. Slotting machining is a machining method for machining of gear. Motion required for processing：（1）主運(yùn)動(dòng)（2）展成運(yùn)動(dòng)（3）圓周進(jìn)給運(yùn)動(dòng)（刀具轉(zhuǎn)動(dòng)）（4）徑向切入運(yùn)動(dòng)（5）讓刀運(yùn)動(dòng)視頻The characteristics of the gear shaper processing （1） High tooth profile accuracy （2） Get the tooth profile of the

16、surface roughness is fine （3） To improve the tooth profile precision of the workpiece and reduce the surface roughness （4） The common normal length change is high （5） The common normal length change is high （6） Processing of helical gear is not very convenient, and cant processing worm gear Gear hob

17、bing machining（滾齒加工）Gear hobbing machining principle of rolling shaping cutter and gear blank is to simulate a pair of helical gear meshing movement. Rolling shaping cutter has e like a little teeth (one or two teeth) long gear, shaped like a worm, form the rows of rack cutter tooth after grinding.

18、So, can the roll teeth as a rack cutter machining of gear blank. Roll grinding wheel process can be broken down into: before a row of blade cut a thin layer of material, after a row of blade cut down, due to rotation for helical gear hob, so make the cutter tooth position to move forward a short dis

19、tance, and gear billet is turned the corresponding Angle at the same time. After a row of blade and cut off another thin layer material. As rack cutter to move forward, gear billet for rotation. In this way, gear blank is YiDaoDao to cut out the whole tooth, tooth flank of tooth profile is envelope.

20、 So, this method can be used a rolling gear knife processing same modulus of different number of teeth gear. There is no theoretical tooth shape error. VidieoThe characteristics of the gear hobbing machining （1） Good adaptability 。 （2） High production efficiency 。 （3） High production efficiency (4)

21、The gear tooth profile surface roughness is poorer （5） Gear hobbing machining is mainly used for spur gears, helical cylindrical gear and worm gear 。 Gear hobbing and gear shaping Hob cutter tooth is a continuous cutting, high cutting speed, the rotation of the gear shaper is blade tooth for recipro

22、cating motion, limits the cutting speed, so the hob productivity higher than burning gear shaper, gear hobbing machine, can process straight helical cylindrical gear and worm gear, but not too close to the machining of internal gear and apart of multigang gear; Sow when gear shaper cutter along toot

23、h length cut out in a row, envelope number, length and hob tooth is by hob continuous cut out many times, so the smaller values of the gear shaper of tooth surface roughness; Gear shaper cutter hob manufacturing, grinding test wall is convenient, easy to get high precision, but the gear shaper point

24、s more complicated than the hob tooth transmission chain, as a result, the precision of gear machining is essentially the same; Gear shaper can gear and multigang gear machining, but can not machining worm gear. Other gear machining method Tooth surface finishing methods have shaving, grinding and g

25、ear honing method. 1、 Gear shaving processing（剃齒加工） Gear shaving is often used in quenching of cylindrical gear finishing, production efficiency is high, has been widely used in the batch and mass production. 2. Gear honing processing （珩齒加工） Same as the gear shaving gear honing processing principle,

26、 is one of the finish machining of hardened tooth profile method. Mainly used to remove oxide coating on the surface of the teeth after heat treatment, reduce the tooth surface roughness, surface rough Ra0.4 0.2 mu m, thereby reducing the noise of the gear transmission. High production efficiency, i

27、s generally used in large quantities of 8 6 machining precision of gear quenching. 3. Abrasive machining （磨齒加工） Abrasive machining is mainly used for the high precision gear or hardened gear tooth shape of finish machining. General condition, the gear machining accuracy can reach 6 to 4, the surface

28、 roughness can reach Ra0.8 mu m 0.2 microns. Due to grinding the grinding wheel and workpiece forced meshing movement way, not only fixed gear error capability is strong, and is especially suitable for processing gear tooth surface hardness is very high. But in addition to the worm wheel gear grinding, the general grinding machining efficiency are low, the equipment structure is complex, difficult adjustme