In the manufacturing industry, there are common misconceptions about high-speed cnc milling v850:
1) The high-speed milling machine is just a milling machine equipped with a high-speed spindle
2) The higher the spindle speed, the faster the processing speed
3) The high-speed milling machine is just to replace the general traditional milling machine
4) The spindle with 20,000 rpm is enough for mold production
5) The high-speed milling machine only increases and speeds up the axial server
6) High-speed milling machine can only process electrodes
7)…………
In fact, high-speed milling machine is a new technology and application:
High speed milling
Material removal area is small but fast
Low temperature
High precision of finished products, slow tool loss
Good surface
To give full play to the efficiency of high-speed cutting, all links must be closely coordinated. If one of the links is not well matched, the efficiency of high-speed cutting will not be able to be used.
1) High-speed arbor and cutter
2) High-speed spindle
3) Highly dynamic XYZ axis
4) High-speed CNC controller
5) High-speed program strategy
01
The basic situation of high-speed cutting
As the speed increases to a certain level, the temperature and cutting force of the tool will gradually decrease instead. This phenomenon is used in high-speed milling technology.
02
The difference between high-speed milling and high-speed milling concepts
The processing concepts of high-speed milling (HSM) and high-performance milling (HPM) are different. Example: rough machining hardened steel, the material hardness is greater than 55HRC,
03
Application range of high-speed milling
1) In order to match the spindle specifications and ensure processing stability and safety, the tool diameter should not exceed 16mm (HSK-E40).
2) Compared with traditional milling, the removal rate of high-speed milling is relatively small, which is very suitable for small parts and mold processing applications.
3) It can be applied to new processing applications such as sheet processing and micro processing.
4) It is a new concept processing method for soft or superhard materials.
Example: Aluminum parts, with a wall thickness of 0.5mm, this part may not be produced without high-speed milling technology.
04
The center of gravity of high-speed milling
(1) High-speed matching tool holder and tool
In fact, it is not the machine doing cutting, but the tool! Knives are like the tires of a car. They are the only parts in the car that touch the ground. A good and suitable tire is the key to victory in a racing car. The selection of tools and processing conditions can be based on the information provided by the tool vendor, but users still need to adjust according to the actual processing conditions.
Criteria for tool selection:
1) Diameter (according to the geometric size and accuracy of the workpiece)
2) Type (rough machining, finishing, slotting, 3D contour, edge machining...)
3) Shape (ball cutter, round nose cutter, multi-edge cutter..)
4) Material (high-speed steel, cemented carbide, cermet, diamond, cubic boron nitride CBN)
5) Tool coating (TiN, TiCN, TiAlN …)
6) Quality (radial runout, shape accuracy, dynamic balance, rigidity)
(2) High-speed spindle
In fact, the high-speed spindle is like the high-speed and high-power engine in an F1 car.
The main shaft can be roughly divided into two specifications:
1) Bearings => high torque, the current maximum speed can reach 54,000 rpm.
2) Bearingless (air driven) => low torque, but very fast speed (>100krpm).
The high torque allows the cutting of larger materials, using larger tools and harder materials. The high speed allows a faster cutting rate and achieves the effect of HSM.
(3) High dynamic performance of each axis
In fact, the bed structure of the machine itself is like the chassis of a car, which is strong and safe to absorb shocks and vibrations.
Traditional hard rails can be adjusted on the machine to obtain better accuracy, but it cannot achieve the high-speed machining that linear slide rails can achieve. High-speed axes and solid bed structure, acceleration is the key factor, high-acceleration axes reduce time waste, better cutting surface, low tool wear.
(4) High-speed milling controller CNC
In fact, the controller is like the driver. Its operating skills determine the outcome of the car. It needs to be forward-looking, sensitive and quick to react.
(5) CAM processing strategy for high-speed milling
In fact, there are many ways to get from one point to the next, but all paths have different effects on speed, surface, etc.
