After sharpening the cutting edge of the tool, micro-notches (ie, micro-cracking and kerf) are different in degree, generally between 0.010 and 0.050 mm, and severely up to 0.1 mm or more. The notch is easily expanded during the cutting process. Damage, increased tool consumption and tool change assist time. Modern high-speed machining and automated machine tools put forward higher requirements for tool performance and stability. Foreign tool edge passivation treatment has been widely applied. It is imperative to narrow the gap with foreign tool performance in China.
First, product structure and characteristics
The planetary mechanism driven by the gear reduction electronic speed regulating motor makes the blade rotate and revolve. The high-speed rotating abrasive-containing nylon disc brush softly grinds (passivates) the blade edge to reduce or eliminate the micro-notch peak height of the cutting edge. , to improve the strength of the cutting edge, to achieve the purpose of improving the durability of the tool. The machine consists of 6 parts:
1) Disc brush head and slide part; abrasive nylon disc brush with passivation blade edge mounted on 2800 rpm high-speed rotating motor shaft, motor fixed on slide, screw, fixing nut and hand Put the control disc brush up and down to passivate the blade edge.
2) Blade turntable transmission part: the planetary mechanism driven by the gear reduction electronic speed regulating motor, the turntable and the blade turntable are steplessly regulated and revolved and rotated, and the disk brush is in contact with the blade mounted on the turntable blade container, and the blade can be uniformly passivated Cutting edge.
3) Rack and water tank parts: disc brush slide, turntable base, inspection magnifier and electrical appliances must be installed on the rack. A submersible pump is installed in the tank to provide cooling and lubrication of the blade passivation process.
4) Detection part: 100 times inspection magnifier is installed on the side of the rack, and the support of the bracket and the tray are adjusted to facilitate the detection of the passivation value of the blade edge.
5) Electrical part: The stepless speed regulation of the turntable and the blade turntable is controlled by the US detector. Disk brush and water pump switch. The time relay can be used to adjust the length of the blade passivation and automatic shutdown.
6) Box seat part: connect and support the passivation machine body, and the leveling vibration damping device is installed at the four corners of the bottom of the box. The drawers and decks in the box facilitate the storage and inspection of the blades.
2, product features:
1) The product structure is compact and reasonable, and the operation is flexible and reliable.
2) The speed of the blade turntable and the turntable can be adjusted steplessly.
3) The length of the passivation and the stop are controlled by the time relay.
4) The blade edge passivation parameter is measurable by the 100x inspection magnifier.
5) Passivate different blade shapes, and the specification of the container tray can be changed.
Second, the blade edge type and passivation parameters recommended
It has been proved by mass production practice that the passivated blade effectively improves the tool life by more than 0.2 times, and the individual increases by 1 to 3 times, which has a direct influence on the selected blade type and cutting edge passivation parameters.
1, cutting edge type
2, the edge passivation shape
The edge type (edge, chamfered edge, white blade, etc.) is closely combined with the shape of the cutting edge (arc type, waterfall type) to correctly handle the relationship between the sharp and solid parts of the tool. The cutting edge of the tool is not necessarily sharper, the better, and not necessarily the more blunt, the better. It is best to have a reasonable and reasonable choice according to the specific processing conditions (fine, rough, impact processing, etc.). Generally, the finishing tool adopts fine (micro-powder) grinding wheel sharpening, the cutting edge is small, the passivation value is also small, 0.010~0.030 mm, the roughing cutting edge passivation value is 0.030~0.050 mm, the impact processing edge The passivation value is 0.050 mm or more.
In addition, the development and research of the overall tool passivation process has been carried out, and the passivation of the multi-varietal bar type overall tool can be carried out, and the effect is very remarkable. Take the spiral end mill as an example: the tool durability is increased by 47.4% on average, and the surface roughness is reduced by one level.
In summary, the cutting edge passivation technology is very important. The ancients said: "The embankment of a thousand miles, collapsed in the ant hole." The micro-notch of the cutting edge of the tool is small, but it affects the performance and life of the tool. Everyone knows that the tool is the "teeth" of the machine tool, which is the main factor affecting the cutting performance and tool life of the tool. In addition to the tool material, tool geometry parameters, tool structure, optimization of cutting amount, etc., it has been proved by a lot of practice: there is a good edge. The type and edge passivation quality is also the premise of how fast the tool can cut and process. Therefore, the condition of the cutting edge of the tool is also a factor that cannot be ignored. Tool edge passivation is feasible and effective in both economy and technology. The further research and development and popularization of passivation technology and passivation equipment are of great significance to the improvement of the overall level of cutting processing in China.
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