1, vertical Honing Sticks i check accessories: Check phone accessories factory configuration is not full original licensed, machine box whether they have certification, barcode, warranty card, check mobile phone standard is complete, if accessories are not complete, most good for a purchase. 2, check the network logo: network logo are generally pinhole printer printing, digital clarity, lighter in color, a close look at a dent Zhenda and violet can be seen under "CMII" legible characters; parallel phone: network signs are generally ordinary inkjet printer, the figures are not clear, the deeper the color, no dents, fake network card in violet lamp will glow, and can see the vague "CMII" words. 3, three yards one: check phone IMEI code. On the phone by pressing * # 06 #, usually displayed on the phone 15 numbers, this is the phone's IMEI code. Then open the phone's battery cover, there is a sticker on the phone, above, there are a IMEI code, this code should be displayed on the phone with the IMEI code exactly. Then check the phone sticker on the packaging box, the above should also have an IMEI code, this code should be displayed on the phone with the IMEI code exactly. If there are inconsistencies three yards, this phone is a problem.
Abrasive Honing Sticks Whetstone Whetstone is an important performance , it directly affects the honing surface quality and productivity. Honing stone used in production are mainly white corundum, corundum, silicon carbide black and green silicon carbide . Developed in recent years to the use of synthetic diamond , cubic boron nitride abrasive honing stone to do . Made of corundum honing stone , honing suitable hardened steel , high carbon steel and high tensile strength and thin-walled parts and large metal toughness , its main disadvantage is that the honing process . Abrasive often quickly collapse , and often whole to fall, losing cutting ability . So often to be replaced or re- grinding Whetstone Whetstone . Whetstone silicon carbide higher hardness than corundum , silicon carbide green silicon carbide hardness higher than black , but their relatively poor toughness , abrasive surface of the blunt edges after the splitting of the abrasive itself gradually falling off automatically , thereby generating new cutting edge , which is the advantage of silicon carbide abrasive . Silicon carbide honing stone for low strength and performance of brittle material . Such as cast iron and non-ferrous metals and non-metallic materials such as brass . Department of diamond abrasive can be divided into two kinds of natural diamond and synthetic diamond . Natural diamond hardness, high strength, high load honing is not easy to shatter. Grinding performance, Xie cutting force is small . More expensive for honing high-strength low toughness of the workpiece material . Synthetic diamond diamond hardness than natural high, but lower strength than natural diamond , good self-sharpening , poor toughness suitable for processing hard or soft workpiece materials . Low price, so use than natural diamond wide range of difficulties . CBN , high hardness, good thermal stability, chemical reaction of ferrous metals and alumina as an inert . Is a good working steel abrasive . Especially suitable for machining hard and toughness of the steel material . If special tool steel ( high vanadium high speed steel ) , heat-resistant alloy steel , nickel -based superalloy , titanium and high- chromium stainless steel. These special materials with artificial diamond whetstone is difficult to process . CBN abrasive these special processing performance , but also in its processing chip white from good. It does not occur on the chip bonded Whetstone phenomenon guarantee its workability of these materials consistently normal .