Q:I need to use this knife to do the work. The material is QT450-10. When the tool is made, the first step is to process and reheat the required hardness without welding the blade, then weld the blade and reprocess.

You should use the 40Cr to do the carrier, alloy blades. Actually come up with these heat treatments to sweat! How 40CR heat treatment can do directly tools?If you do the words, and it. Hardness is based on the condition of your knife, and 32-38HRC shouldn't be a big problem

Q:The drill holes to make reamer reaming little what method is solved, (drill reaming to hit Phi 8.5, Phi 9)

How long has the reamer been on? What's the depth of the hinge? First change a new one that meets the accuracy requirements of the reamer.

Q:Diameter 4.2, depth 12, roughness 0.8, tolerance 0.02., cutting, each edge 0.02. material is stainless steel. Carbide reamers are used, with a 45 degree reamer at the beginning and a crack at the tip! Then change to 30 degrees, the middle of the place or collapse! Either the size is too bad! In the gloom!

Oh, I didn't make it clear. The total margin is 0.1. The speed is 300R/min. Feed 40mm/min. Do you mean spiral reamer?

Q:The reamer H7 and H8 are of high accuracy

H7 high, of course

Q:The number of drills and reamers for diameter from 1 to 20.. The more detailed, the better

Silly sister asked brother not on the list?

Q:How can the reaming of stainless steel extend the life of the reamer and allow Kong Guangliang to help with various problems?

Must work card reamer, oil tapping oil, black thick oil

Q:Why are the dimensions of the reamer larger than the size of the hole?

The reamer is fine cutting tools a certain size of the hole, the hole in finishing before must leave the finishing allowance, so the hole than the knife which small dumplings,What this says is positive solution. What you ask is very mechanical.

Q:If you want to drill out 20 of the hole with a reamer, what size drill should you use first?

Because some of the drilling bit out of the hole is too large, such as drilling 19 of the drill hole is often 19.1/19.2, this situation should be more often encountered. If the reamer you use for machining is of good quality, it is recommended that the drilled hole be 19.9. Usually, the allowance for the reamer is 0.1-0.2mm. As to how large the drill is, it depends on how large the hole you drill out of. You can try using the 19.5 bit.

Q:Machine is a horizontal machining center Huakai, machining hole size is 14mm through hole, the first with 13.5 bits, then the 14 hinge reamer, reamer is 120 speed 320 feed speed, casting hardness is HB170 ~ 241, made out of the hole often bell shaped, reamer blade also day after day grinding, grinding or not, sometimes for a new reamer like bell. Who can help me analyze the reasons?.

The allowance is large. Use the 13.8 reamer to enlarge the table. Hit the blade to see if the blade is on the same heart. Measure both the front and back blades.

Q:What's the difference between a bore cutter and a reamer?

In fact, from the number of edge cutting is not what special distinction, and a single blade Boring Reamer and multi edge points. Mainly from the processing technology to distinguish the reamer just to get better precision holes, generally on the machine are low, processing is relatively simple, the position of the size precision boring not only can get a better hole hole can also be modified!!