Проектирование круглых протяжек Вариант 3

GRECHISHNIKOV V. A., CHEMBARISOV N. And.,
SKHIRTLADZE A. G., STUPKO V. B., HISAMUTDINOV R. M., Matveev V. N., sukhinina L. A., LARIONOV D. N.
THE DESIGN OF CUTTING TOOL
Tutorial to perform
course project on discipline
«Cutting tool»

SOURCE DATA
1) stretched billet:
* material-40H steel;
* tensile hardness HB 241;
• preparation – after the holidays;
* the hole for stretching is treated with a drill;
* hole diameter before stretching-d0 = 32.4 mm;
* hole diameter after stretching-D = 34 0.050 mm;
• * the parameter of surface roughness Ra 0.8;
* stretching length-l = 40 mm;
* Character of walls: TN (thin-walled);
2) machine Tool:
* * horizontal-broach, model7a520;
* machine pulling force Q = 200000 N;
* maximum stem stroke length Lmax = 1600 mm;
* operating speed range 1.5-11.0 m / min;
• the state of the machine is satisfactory;
* the broach is fixed in the quick-change cartridge.
* Cartridge type-B;
3) the Nature of production-mass;
4) the length of the broach, permissible for the tool shop and correspondence Department, not more than 1500 mm.