What are the basic requirements for knives in the processing of electronic cigarette accessories?

1. The geometric parameters of the tool for electronic cigarette accessories &nbsp ;

When machining electronic cigarette accessories, the geometry of the cutting part of the tool should generally be from the front corner , the choice of rear corners to consider. When selecting the rake angle, factors such as the chip curling geometry, the presence or absence of chamfers, and the positive and negative angles of the edge inclination should be considered. Regardless of the type of tool, a larger rake angle is required when machining electronic cigarette accessories. Increasing the rake angle of the tool reduces the resistance encountered during chip separation and clearance. The selection requirements for the relief angle are not very strict, but it should not be too small. If the relief angle is too small, it is easy to cause serious friction with the surface of the workpiece, which will deteriorate the roughness of the machined surface and accelerate the wear of the tool. And due to strong friction, the effect of work hardening on the surface of stainless steel is enhanced; the relief angle of the tool should not be too large, and the relief angle is too large, which reduces the wedge angle of the tool, reduces the strength of the cutting edge, and accelerates the wear of the tool. In general, the relief angle should be appropriately larger than when machining ordinary carbon steel.

2. Requirements for the surface roughness of the cutting part of the tool for electronic cigarette accessories strong>

Improving the surface finish of the cutting part of the tool reduces the resistance of the chip to curl and increases the durability of the tool. Compared with the processing of ordinary carbon steel, the cutting amount should be appropriately reduced when processing electronic cigarette accessories to slow down tool wear; at the same time, appropriate cooling and lubricating fluid should be selected to reduce the cutting heat and cutting force during the cutting process and prolong the service life of the tool. .

3. Requirements on blade material for electronic cigarette accessories

When processing electronic cigarette accessories, due to the large cutting force, the tool bar needs to have sufficient strength and rigidity. To avoid chatter and deformation during cutting. This requires the selection of an appropriately large cross-sectional area of the arbor, and at the same time, a material with higher strength should be used to manufacture the arbor, such as quenched and tempered No. 45 steel or No. 50 steel.

4. Requirements for the cutting part of the tool

When processing electronic cigarette accessories, the material of the cutting part of the tool is required to have high wear resistance and can be used in Maintains its cutting performance at higher temperatures. Currently commonly used materials are: high-speed steel and cemented carbide. Since high-speed steel can only maintain its cutting performance below 600°C, it is not suitable for high-speed cutting, but only suitable for processing stainless steel at low speed. Since cemented carbide has better heat resistance and wear resistance than high-speed steel, tools made of cemented carbide are more suitable for cutting stainless steel.

Cemented carbides are divided into two categories: tungsten cobalt alloy (YG) and tungsten cobalt titanium alloy (YT). Tungsten-cobalt alloys have good toughness, and the tool can be made with a larger rake angle and a sharper edge. During the cutting process, the chips are easily deformed, the cutting is light, and the chips are not easy to stick to the knife, so in general In this case, it is more suitable to use tungsten-cobalt alloy to process stainless steel. Especially in the case of rough machining and intermittent cutting with large vibration, tungsten-cobalt alloy inserts should be used. Tungsten-cobalt-titanium alloy has better red hardness and is more wear-resistant than tungsten-cobalt alloy under high temperature conditions, but it is more brittle and is not resistant to impact and vibration. It is generally used as a tool for stainless steel finishing.

5. Selection of tool material grades

The cutting performance of the tool material is related to the durability and productivity of the tool, and the craftsmanship of the tool material affects the tool itself manufacturing and sharpening quality. It is advisable to choose tool materials with high hardness, good adhesion resistance and toughness, such as YG-type cemented carbide, not YT-type cemented carbide, especially when processing 1Gr18Ni9Ti austenitic stainless steel, YT-type cemented carbide should be avoided, because Titanium (Ti) in stainless steel and Ti in YT-type cemented carbide have an affinity, and chips are easy to take away Ti in the alloy, which promotes tool wear. Production practice shows that the selection of YG532, YG813 and YW2 three grades of materials to process stainless steel has better processing results.

6. Selection of tool geometry parameters

The choice of rake angle From the aspect of cutting heat generation and heat dissipation, increasing the rake angle can reduce the cutting heat However, if the rake angle is too large, the cutting temperature will increase due to the reduction of the heat dissipation volume of the cutter head. Reducing the rake angle can improve the heat dissipation conditions of the tool head, and the cutting temperature may be reduced, but if the rake angle is too small, the cutting deformation will be serious, and the heat generated by the cutting will not be easily dissipated. Practice has shown that it is appropriate to take the rake angle go=15°~20°.

Selecting the clearance angle When rough machining, the cutting edge strength of the powerful cutting tool is required to be high, so it should be Take the smaller clearance angle; during finishing, the tool wear mainly occurs in the cutting edge area and the flank surface. For electronic cigarette accessories, such as materials that are prone to work hardening, the friction of the flank surface has an impact on the quality of the machined surface and the tool. The effect of wear is great, and a reasonable clearance angle should be: for processing austenitic stainless steel (below 185HB), the clearance angle can be 6°~8°; for processing martensitic stainless steel (above 250HB), the clearance angle is 6°~8 °; When processing martensitic stainless steel (below 250HB), the clearance angle should be 6°~10°. Selection of the edge inclination angle The size and direction of the edge inclination angle determine the direction of the chip flow, and the edge inclination angle ls is reasonably selected, usually -10°~20° is appropriate. When micro-finishing the outer circle, the fine-turning hole, and the fine-planing plane, a large-edged inclination tool should be used: ls45°~75°.

7. Selection of cutting amount

In order to suppress the generation of built-up edge and scale spur and improve the surface quality, when machining with carbide tools , The cutting amount is slightly lower than that of turning ordinary carbon steel workpieces, especially the cutting speed should not be too high. Generally, the recommended cutting speed is Vc=60~80m/min, the cutting depth is ap=4~7mm, and the feed rate is f=0.15 ~0.6mm/r is suitable.