High performance graphite as electrode material has high strength, low electrode consumption, fast processing speed and thermal deformation
It has the advantages of small size and high processing temperature. It is used in the mold electric fire of products in China's automobile, home appliance, communication and electronics industries
Flower processing has been widely used in manufacturing, especially in the manufacture and application of thin-walled or micro electrodes with copper electrodes
Incomparable advantages. The high speed milling technology of cemented carbide micro milling cutter is to realize the high efficiency of thin-wall or micro graphite electrode
The main means of high-precision machining, but due to the lack of graphite high-speed milling mechanism, tool wear mechanism and high
There are still many problems in the actual production, which can not be fully exploited
Advantages of high speed milling. According to the urgent need of graphite high-speed milling technology in mold manufacturing industry
The chip formation mechanism, tool wear mechanism, surface quality, cutting force and typical thin-walled structure of high-speed milling are analyzed
The optimization of graphite electrode process parameters and programming strategy are systematically studied
Through theoretical and experimental research, and through the high-speed milling of typical thin-walled graphite electrode, the research results are verified
Study the rationality and practicability of the results
In the research of chip formation mechanism of graphite high-speed milling, online photography and material microanalysis technology are used
The basic characteristics of the graphite chip formation process were analyzed through the research of graphite orthogonal cutting and high-speed milling respectively
Sign; Combined with the geometric relationship between the maximum cutting thickness of a single tooth of a high-speed milling micro milling cutter and the feed rate and radial cutting depth,
For the first time, the relationship between high-speed milling processing conditions and graphite chip morphology, chip particle size distribution, machined surface morphology
Relationship between surface breakage rate and surface roughness; The chip formation process, cutting force characteristics and tool wear are analyzed
The mechanism model of graphite high speed milling is proposed. The results show that in the process of graphite high speed milling,
With the increase of the maximum cutting thickness of a single tooth, the graphite chips gradually change from quasi continuous chips to extruded particles
The chip dominated and the broken chip dominated; The feed per tooth and radial cutting depth affect the maximum cutting of a single tooth
Thickness to change the chip formation process of graphite high-speed milling, reduce the feed per tooth and radial cutting depth, and adopt
Up milling can reduce the breakage rate of graphite surface; Effect of increasing cutting speed on chip formation in graphite high speed milling
The influence of; It is easier to form large pieces of broken chips by cutting with positive rake angle, and the back angle and spiral angle affect the graphite cutting
The chip formation process has little influence: the cutting force waveform changes with the change of the graphite chip formation mode. Adopt Fig
The image processing method is used to calculate the surface breakage rate, which is not only an evaluation index of the processed surface quality of graphite, but also a
Systematically studying the mechanism of graphite high-speed milling, cutting force and tool wear is an important research means, and organically applying it to
Used in the relevant research of this paper.
In the research of cutting force in graphite high-speed milling, the influence of the change of cutting conditions on the chip formation process, surface breakage rate and the friction coefficient between the flank and the workpiece surface in graphite high-speed milling was studied

The influence of cutting parameters, tool geometry angle and graphite material properties on cutting force of graphite high-speed milling is analyzed
According to the time-domain waveform characteristics of cutting force and the changing trend of frequency-domain components with tool wear, the basic selection principle of high-speed milling process parameters to reduce cutting force is proposed. Through the orthogonal experimental design based on Taguchi's method
The main factors affecting the cutting force of graphite high-speed milling are analyzed. The process parameters with the minimum cutting force as the optimization target are obtained
Optimal horizontal combination.
In terms of the friction and wear characteristics of graphite / cemented carbide pairs, a standard disk pin friction experimental machine was used
The sliding friction and wear experiments were carried out, and the abrasive wear experiments were carried out with an improved disk pin friction and wear experimental device
Test, simulate the friction and wear characteristics between chips and workpiece materials and cemented carbide tool surface during graphite high-speed milling
The sliding friction and wear behavior and abrasive wear behavior of graphite / cemented carbide pair were studied for the first time
The tool wear mechanism of ink high-speed milling provides a tribological theoretical basis. (1) Sliding of graphite and cemented carbide pair
In terms of dynamic friction and wear characteristics, the relationship between normal load, sliding speed and friction pair in sliding friction and wear process was studied
The relationship between surface characteristics, friction coefficient and friction temperature shows that the surface of cemented carbide pin is in friction
Graphite transfer film is formed during the process: the wear surface of the cemented carbide pin has the characteristics of "polishing" abrasive grain wear:
Increasing the normal load and sliding speed can promote the formation of transfer film and reduce the friction coefficient and friction temperature.
(2) In terms of the abrasive wear characteristics of graphite / cemented carbide pairs, WC grains in the abrasive wear process were studied
Degree, CO content, normal load, sliding speed and the effect of coating on the surface micro morphology, specific wear rate and
The research results show that the wear surface of cemented carbide has "polished" abrasive wear and
Micro cutting abrasive wear characteristics; The specific wear rate and friction coefficient of cemented carbide vary with WC grain size and Co
With the increase of normal load, the sliding speed has little effect on the content of the oil;
AITiN coating has anti-wear and anti friction effect on carbide micro milling cutter for graphite high-speed milling, but it is not very obvious
Write. (3) By adding graphite chips on the contact surface of the friction pair, the effect of graphite chips on the sliding of the friction pair was studied
The results show that graphite chips can reduce the friction coefficient and friction temperature
So that the friction coefficient decreases as the normal load decreases and the sliding speed increases.
In the study of tool wear and damage in high-speed milling graphite with cemented carbide micro milling cutter, graphite high
The tribological conditions in the high-speed milling process reveal that coated and uncoated cemented carbide micro milling cutters are used for high-speed milling of graphite
The research results show that the early peeling off of the coating is the early failure of the coating
Form, "polishing" abrasive wear is the main wear mechanism of coated carbide micro milling cutter in the stable wear period. first
Secondly, the effect of WC grain size and CO content on the wear resistance of high-speed milling graphite with cemented carbide micro milling cutter was studied
The results show that the wear resistance of cemented carbide micro milling cutter increases significantly with the decrease of WC grain size and CO content, but when CO content is too small, the impact resistance of cemented carbide micro milling cutter will be improved

There was a significant decrease; 7 ultra fine grain cemented carbide o.2ttmwc -- 8% CO is the most suitable cemented carbide matrix material for graphite high-speed milling, which provides a basis for the optimization of the matrix material of coated cemented carbide micro milling cutter. Combined cutting
Influence of condition change on chip formation process, surface breakage rate and friction between flank and workpiece surface in graphite high speed milling
The influence of cutting parameters, tool geometry angle and graphite material properties on tool wear was studied
The optimization strategy of process parameters to reduce tool wear is proposed; A high speed method to reduce tool wear is proposed
Basic strategies of milling process parameters. Through the orthogonal experimental design based on Taguchi method, the factors affecting graphite were found
The main factors of tool wear in high-speed milling, and the process parameters with the objective of achieving the minimum tool wear are obtained
Number is the optimal horizontal combination. In the research of high-speed milling technology for typical thin-walled graphite electrodes, the research results of the full text are comprehensively applied
As a result, in view of the process characteristics of high-speed milling of graphite electrodes with typical thin-walled structure, for the first time
Rough machining, semi finishing and finishing programming strategies, processing technology, process parameters and machining tools for high-speed milling of typical thin-walled structure graphite electrodes,
The high-speed milling process is formulated, and the CNC high-speed machining program is compiled. The thickness of 0.3ram
The thickness height ratio is l:53_ High speed milling with low cost, high quality and high efficiency for thin-walled graphite electrode of 3, with rough surface
The roughness Ra is only 0,17ttm.
Key words: high performance graphite, high speed milling, cemented carbide micro milling cutter, chip formation mechanism, surface crushing rate,
Cutting force, abrasive wear, tool wear and breakage, process parameter optimization, thin wall