The technology of high speed cutting equips

Time:2023-06-15 13:38:32
Click:93
source:MCGUFFIE CNC Machining

Summary: Introduced system of machine tool of high speed cutting and its servo, control, cutting tool and equipment of form a complete set, so that correct choose and buy uses concerned technology equipment, produce its effect adequately. Keyword: High speed cutting; Servo; Control a system; Cutting cutting tool; Cutting of high speed of equipment of form a complete set (the famous cutting experiment of Carl Salomn of physicist of cutting of Germany of traceable of concept of High Speed Cutting-HSC) and its physics amplify. He thinks certain working material correspondence has rate of a critical cutting, its cutting temperature is highest. Inside groovy cutting limits (area of 1A seeing a picture) cutting temperature Tv rises as the accretion of cutting speed Vc, after cutting speed reachs critical cutting rate, cutting rate increases again, cutting temperature drops instead () of area of 1C seeing a picture, cross B region so, cutting undertakes in area of C of high speed area, usable and existing cutting tool undertakes high speed cutting, reduce cutting man-hour greatly thereby, twice improves the productivity of the machine tool, improve treatment quality management at the same time, can use at cutting to process the work of material all sorts of hard, tenacity, hard. Accordingly, go up oneself century since 80 time, the country is the mould of explicit manufacturing industry, aviation, spaceflight, car, accurate machinery, optical in waiting for a lot of branches with home appliance, begin to use this advanced technique extensively, obtained very big effect. Current, face the international of day of beneficial aggravate to be contended for unexpectedly, domestic broad company is pressing need has more comprehensive knowledge to HSC processing technique, so that can correct choose and buy concerns technical equipment, produce its effect adequately, obtain grant period economic benefits. Machine tool of cutting of 1 high speed to get used to thick finish machining, weight cutting and sudden shift, assure high accuracy at the same time (± of fixed position precision 0.

005mm) , the machine tool with good performance is the crucial factor that realizes high speed cutting. Its key technology has the following: 1.

Main shaft of high speed of main shaft of 1 high speed is the core component of machine tool of high speed cutting, rise ceaselessly as what ask to main shaft rotate speed, traditional gear -- system of transmission of leather belt gearshift because the reason such as the vibration of itself, noise already cannot get used to a requirement, those who replace is a kind of original function part -- electric main shaft, it adds up to main shaft electric machinery and machine tool main shaft 2 for one, realized the unifinication of main shaft electric machinery and machine tool main shaft. Electric main shaft used electronic sensor to control temperature, take water-cooling or oily cold circulatory system oneself, make main shaft maintains constant temperature when high speed rotates, general controallable in temperature of set of the some inside limits of ° of 20 ° ~25, precision is ± 0.

7 ° , use oily mist at the same time the new technology such as bearing of lubricant, mixture pottery and porcelain, make main shaft maintenance-free, macrobian life, high accuracy. 1.

Bearing of high speed of bearing of nicety of 2 high speed is the core of machine tool of high speed cutting, it is the most crucial part that decides life of high speed main shaft and laden capacity. 1.

Bearing of 1 magnetism in suspension it is the magnetic force that use phone main shaft inorganic in suspension of instrument contact ground rises, its rotate speed can amount to 45000r/min, power is 20kW, precision is tall, be diagnosed when Yi Shi is actual and online monitoring, it is ideal bearing component, but its price is higher. 1.

2 liquids activity presses bearing to use a fluid to move, the idea that static force photograph combines, in making main shaft is propped up in oily film, rotate, have diameter, axial to beat small, rigid damp character is good, good, comfortable at thick, finish machining, the advantage with long life. But its do not have versatility, care and maintenance is more difficult. 1.

Bearing of 3 mixture pottery and porcelain transforms combination of the ball that silicon makes and steeliness orbit photograph with nitrogen, it is current most bearing cell is used on main shaft of machine tool of high speed cutting, centrifugal when high speed is rotational force is small, tigidity is good, temperature is low, life is long, power can amount to 80kW, rotate speed is as high as 150000r/min, its standardization rate is high, facilitate safeguard, the price is low. Nextpage1.

Servo of 3 high speed is machined to realize high speed cutting, machine tool not only should have high speed main shaft, have high-speed servo even, this is to improve manufacturing efficiency not only, also be the requirement that the cutting tool in maintaining high speed cutting works normally, can cause a knife otherwise wear away quickly with warm up, destroy the exterior quality that workpiece machines. 1.

Servo of 1 linear electric machinery is linear electric machinery is to make electric energy transforms directly the device of a kind of thrust of sharp mechanical movement, shorten the length of catenary of drive of machine tool feed for 0, its trends answers function stiffness of nimble, drive precision is tall, tall, add decelerate to spend big, the journey unlimited, noise low, cost is higher, below the circumstance that is more than 1g in acceleration, it is the only alternative of servo. 1.

Guide screw of ball of actuating device of 2 ball guide screw still is the main actuating device of high speed servo, electric machinery of the servo that use AC is direct drive, use hydraulic pressure bearing, feed speed can amount to 40~60m/min, its acceleration can exceed 0.

6g, cost is inferior, it is the 1/2 of linear electric machinery only.

5. 1.

4 high-powered CNC control the mechanical performance with good machine tool of cutting of systematic high speed, must pass its admirable control performance ability to be developed quite adequately. High speed main shaft, high speed servo develops with what control a technology inseparable. The computerized numerical control that is used at HSC (CNC) system must have very high operation rate and precision, and the servo control that answers quickly. The CNC system of HSC machine tool is inside same period of time the CNC system that the data that needs computational processing compares machine tool of ordinary numerical control is gotten more much, with respect to the requirement former computation handles capacity and speed to rise greatly, the hardware of its CNC system, introduce the PC with powerful function implement person configuration. Gallop for example chip, 64MB memory, 1-10GB hard disk, make the executive time of program block reduces 3~0.

5 μ S. Dimensional corkscrewed yarn, parabola and batten interpolation function, speed is deployed to control a function beforehand on this foundation, digitlization is automatic and flowing athletic contrail function, quicken and the function of choppy speed monitoring when apply the brake is waited a moment, make workpiece machines quality to get clear improvement when high speed cutting. Accordingly, servo develops to be changed for digitlization, intelligence change with software, make servo and CNC system are in A/D, won't have in D/A changeover missing or defer phenomenon, especially electric machinery of servo of communication of total number word and control technology already got applied extensively, the main characteristic of this technology is have excellent kinetic feature, without extremely drift, tall outline precision, made sure Gao Jin gives speed the demand of treatment thereby. Cutting tool of cutting tool of cutting of 2 high speed is one of technical equipment with important machining. Because of easy use up, once machine tool function is obtained,decide, make the central point of attention. Lift as rotate speed as a result of centrifugal force and increase quickly, high speed main shaft carries what the ministry is the same as knife handle head to give close to there are a lot of special places in structure and measure respect. Introduce HSK form and series basically at present, need decides knife handle parameter according to parameter of machine tool main shaft, make be identical of their conform to. Because cutting and feed rate are high, the life of the cutting tool in HSC treatment can fall commonly paper, need from cutting tool material, geometry parameter, dangerous extend geometry of length and cutting parameter, cutting each respect such as relation, course taking a knife, lubricant refrigeration takes step, reduce life as far as possible fall paper. The cutting tool data that HSC treatment uses basically has hard alloy coating, pottery and porcelain, get together nitrogen of brilliant cubic metre changes diamond of boracic He Jujing to wait for a few kinds big. HSC cutting tool and photograph of horn of around of common cutting tool are compared, general HSC compares common cutting before horn is made an appointment with small 10 ° , horn is made an appointment with after big ° of 5 ° ~8. At the same time the cutting position of HSC cutting tool should as far as possible short, in order to raise the tigidity of cutting tool and the damaged rate that reduce penknife blade. Anyhow, should wait for the geometrical dimension that will choose material of knife handle, cutting tool and cutting tool according to parameter of main shaft of the lot size of workpiece material, workpiece, machine tool. The form a complete set of 3 HSC machine tool equips (1) assists man-hour to shorten, machine tool of great majority HSC deserves to have 15~30 knife the library mixes the cutting tool of above to trade knife unit automatically, become HSC machining center. (2) is cooling and lubricant the system is cannot match suit less to have, include among them be opposite automatically the machine tool is departmental the function that has cooling lubricating and platoon bits function, needing what consider alone is the cooling and lubricant device of cutting tool, for example wind cold device or oily mist are lubricant and cooling device, need give attention to two or morethings to play bits function. (The interface of 3) electron handwheel and CAD/CAM system and system of high speed CNC, it is the unit of necessary form a complete set that affects a machine tool to operate control property. (4) can survey the diameter of cutting tool, length and the laser that undertake damaged detects or infrared system automatically. (5) measures a head to be able to install the infrared measurement unit that explores workpiece outline aspect to the in order to on main shaft. (After 6) malfunctions to decrease, stop machine the time that awaits repair, in number of machine tool stage the case with much, high utilization rate falls, reserve main shaft of a high speed. (The safe guard of 7) HSC machine tool, include hardware and software, although be in,should assure produce cutting tool burst and high speed plays the extreme circumstance that flies to fall, the person of the person that still can protect an operation reliably to use is safe, the interference that and can prevent a machine tool the accident generates between component, cutting tool, workpiece collides. The technical equipment of high speed cutting involves numerous and new and high technology, the material that needs fibrous root seizes this unit product, precision, batch technology that will choose to match equips, make its aborning produces effect adequately. CNC Milling