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FAQ

My company is using hobbing - shaving processing technology, the amount of shaving measurement, cross rod spacing and shaving teeth life size difference of 0.12mm-0.15mmThe accuracy level of the hob is related to the accuracy of the processing gear. The gears we processed require 7 levels of accuracy. The hob before each order is a class a precision, which is in conformity with the standardRecently a group of B level precision hob, no difference in other parameters, not on the bed test work, I would like to consult friends, what will the accuracy grade of hob parameters of gear, like our shaving, shaving is not able to correct these errors?

The higher the accuracy, the smaller the gear tolerances, the better the surface finish. But you want to see carefully, and write is B class, sometimes can not reach the B level requirements, and only test to know whether it is B level, so must buy big manufacturers of goods

Why is the front rake hob good for chip removal?

In my understanding, the front corner is the angle formed by the front face and the vertical direction. Thank you for your communication

What is the "hob" knife?

Ordinary cylindrical things use thisFor example, use cucumberFirst, at the end of a knife after the material roll chamfer an angle in a way called the beveled knife roller blade.Sorry, I can only find this one

Known gear hobbing machine speed, knife, and hob modulus, the number of teeth of the workpiece, the processing thickness (Chi Kuan), how to calculate the processing hours?

The thickness is divided by the speed divided by the number of teeth multiplied by the knife.. Minutes.. It doesn't matter the size of the module..

What do you think about the cutting hob?

The thin one becomes thin Mostly uniform, and don't cut it.

Recently in the shield machine cutter rock breaking simulation, the stress on body feels wrong, ask the shield machine general disc stress on the hob is, what about the magnitude is hundreds of MPa or greater?

30MPa, the answer is complete.

How to adjust the torque of disc hob commonly used in TBM?

Although this problem a long time ago, but still can answer, upstairs are not reliable. The torque of the disc hob is determined by adjusting the inside ring size. General choice of repair, after the experience is easy to handle, according to experience values often meet the requirements.

How about the front edge, the normal and the normal tooth shape of the hob with rake angle?

Generally speaking, the front rake or the negative rake of the hob, the slot is straight. If the spiral groove hob, then the front face of the eccentric distance can not be controlled, the front and left side of the tooth shape can not be measured using the front face of the intuitive measurement method, there will be no knife surface measurement method is inevitable. If you really need, you can use the following formula Tan = w (Tan an*cos af+-sin AF *sin WF /cos WF) this formula can be converted into the reference tooth angle parameters of front blade tooth angle formula in meaning, can I see the previously available analytical formula