模具高速铣削加工技术-机械外文翻译-夹具设计翻译

3.0 闻远设计 2023-10-01 128 4 73KB 13 页 10光币

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Mold high speed milling processing technology

The abstract Introduced the high speed milling in the mold processing

application as well as the influence, and brief introduction high speed milling engine

bed structure, control system and cutting tool. Has carried on the simple analysis to

the high speed processing craft.

Key word high speed milling; mold processing

First, foreword

In the modern mold production, along with to models artistic and the function

must obtain more and more high, models the internal structure to design more and

more complex, the mold contour design day by day is also complex, the free curved

surface accounts for the proportion to increase unceasingly, the corresponding mold

structure also designs more and more complex. These all set a higher request to the

mold processing technology, not only should guarantee the high manufacture

precision and the surface quality, moreover must pursue the processing surface

artistic. Along with is unceasingly thorough to the high speed processing engineering

research, is processing the engine bed, the numerical control system, the cutting tool

system, CAD/ especially Correlation technology and so on CAM software develops

unceasingly under the impetus, high speed processes the technology more and more

many to apply in the mold cavity processing and the manufacture.

The numerical control high-speed cutting processing took in the mold

manufacture a most important advanced manufacture technology, is the collection is

highly effective, high quality, the low consumption in a body advanced manufacture

technology. Is opposite in the traditional machining, its cutting speed, entered to the

speed had the very big enhancement, moreover cut the mechanism not to be same.

The high-speed cutting caused the machining to have the leap, its specific power

metal excision rate enhanced 30%~40%, the cutting force reduced 30%, the cutting

tool working durability enhanced 70%, remained hotly large scale reduces in the work

piece cutting, the low step shudder vanished nearly. Along with the cutting speed

enhancement, unit time semifinished materials material removing rate increased, the

cutting time reduced, the processing efficiency enhanced, thus reduced the product

manufacture cycle, enhanced the product market competitive power. At the same time,

the high speed processing small amount entered quickly causes the cutting force to

reduce, the scrap high speed discharged reduced the work piece cutting force and the

thermal load distorts, enhances the rigidity to be bad and the thin wall components

machining possibility. Because cutting force reducing, the rotational speed

enhancement causes the cutting system the operating frequency to be far away the

engine bed the low step natural frequency, but the work piece surface roughness is

most sensitive to the low step frequency, from this reduced the surface roughness. In

mold high hard steel stock (HRC45~HRC65) in the processing process, uses the high-

speed cutting to be possible to substitute for the working procedure which the

electrical finishing and rubs truncates polishes, thus has avoided the electrode

manufacture and the time-consuming electrical finishing, large scale reduced fitter's

polishing with to throw the light quantity. Thin wall mold work piece more and more

needs which regarding some markets in, the high speed milling also may smoothly

complete, moreover in the high speed milling CNC processing center, a mold attire

clamps may complete the multiplex step of processing.

The high speed processing technology has had the huge influence to the mold

processing craft, changed the traditional mold processing to use "the annealing →

milling processing → heat treatment → to rub truncates" or "the electric spark

machining →manually polishes, polishes" and so on the complex long technical

process, even might use the high-speed cutting processing substitution original

complete working procedure. The high speed processing technology besides may

apply in the hard mold cavity direct processing (in particular half precision work and

precision work), in EDM aspect and so on electrode processing, fast type manufacture

also obtained the widespread application. The mass productions practice indicated

that, the application high-speed cutting technology may save in the mold following

processing 80% handwork to grind the time approximately, saves the processing cost

expense nearly 30%, the mold face work precision may reach 1 m, the cutting tool

cutting efficiency may enhance one time.

Second, high speed milling processing engine bed

The high-speed cutting technology is one of machining technology main

development directions, it along with foundation technology the and so on CNC

technology, microelectronic technology, new material and new structure development

but steps a higher stair. Because the mold processes particular as well as high speed

processing technology own characteristic, (processed engine bed, numerical control

system, cutting tool to the mold high speed processing related technology and the

craft system and so on) proposed processed a higher request compared to the

traditional mold.

1. High stable engine bed strut part

The high-speed cutting engine bed lathe bed and so on supports the part to be

supposed to have very well moves, the static rigidity, hot rigidity and best damping

characteristic. The majority of engine beds all use high grade, the high rigidity and

Gao Kangzhang the gray iron took the strut part material, some engine bed companies

also increase the high damping characteristic in the foundation polymer concrete, by

increases its vibration-proof and the thermostability, this not only may guarantee the

engine bed precision is stable, also may prevent when cutting the cutting tool inspires

trembles. Uses the enclosed lathe bed design, the overall casting lathe bed, the

symmetrical lathe bed structure and has the densely covered stiffener and so on also

enhances the engine bed stable important measure. Some engine bed companies'

research and development departments in design process, but also uses the modality

analysis and the finite element structure computation and so on, optimized the

structure, stably causes the engine bed strut part to be reliable.

2. Engine bed main axle

The high speed engine bed main axle performance is the realization high-speed

cutting processing important condition. The high-speed cutting engine bed main axle

rotational speed scope is 10000~100000m/Min, the main axle power is bigger than

15kW. Is not bigger than 0.005mm through the main axle compressed air of or axial

play between the cooling system control hilt and the main axle. Also requests the

main axle to have the fast vertical speed, to assign the performance which the position

is fast stops (namely to have extremely high angle addition and subtraction speed),

therefore the high speed main axle often uses the liquid static pressure bearing type,

the air static pressure bearing type, the thermo-compression nitriding silicon (Si3N4)

the ceramic bearing magnetism aerosol bearing type isostructuralism form. Lubricates

uses technology and so on oil gas lubrication, splash lubrication. The main axle cools

uses the main axle interior water cooling generally or air cooled.

3. The engine bed actuates the system

In order to satisfy the mold high speed processing the need, high speed processes

the engine bed the actuation system to be supposed to have the following

characteristic:

(1) high entering for speed.

The research indicated that, regarding the minor diameter cutting tool, enhances

the rotational speed and each tooth enters for the quantity is advantageous in reduces

the cutting tool attrition. At present commonly used entering for the speed range is

20~30m/Min, like uses leads greatly the ball bearing guide screw transmission, enters

may reach 60m/ for the speedMin; Uses the straight line electrical machinery then

may enable to achieve 120m/ to the speedMin.

(2) high acceleration.

Has the good acceleration characteristic to the three dimensional complex curved

surface silhouette high speed processing request actuation system, the request

provides the driver which the high rapid advance or progress gives (to enter speed

approximately 40m/ quicklyMin, the 3D outline processing speed is 10m/Min), can

provide 0.4m/S2 to 10m/The s2 acceleration and reduces the speed.

The engine bed manufacturer mostly uses the entire closed loop position servo-

control slightly to lead, the great size, the high grade ball bearing guide screw or leads

greatly many guide screws. Along with the electrical machinery technology

development, the advanced straight line electric motor already was published, and the

success applied in the CNC engine bed. The advanced straight line direct motor drive

enable the CNC engine bed no longer to have the mass inertia, in advance, question

and so on lag and vibration, sped up the servo speed of response, increased the servo-

control precision and the engine bed processing precision.

4. Numerical control system

The advanced numerical control system is guaranteed the mold complex curved

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摘要：

MoldhighspeedmillingprocessingtechnologyTheabstractIntroducedthehighspeedmillinginthemoldprocessingapplicationaswellastheinfluence,andbriefintroductionhighspeedmillingenginebedstructure,controlsystemandcuttingtool.Hascarriedonthesimpleanalysistothehighspeedprocessingcraft.Keywordhighspeedmilling;mol...

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