Toq' jinslarini kesuvchi - parchalovchi ta'sirli (PSD) instrument bilan kuchlar ta'sirini ifodalovchi model taklif etilmoqda. Modelni aylanma, aylanma - zarbali, zarbali - aylanma burg’ulash usullari uchun toq' jinsining qattiqligi bo 'vlab ishlash chegarasi ko 'rsatilgan.

Tayanch iboralar: aylanma, aylanma - zarbali, zarbali - aylanma burg ’ulash, о ’qiv kuch, kesish kuchi, instrumentni natijcn’iv kuchi, tog ’ jinsiga burg 'uni kirishiga lining qarshilik kuchi, tog ’ jinsini uyulishiga lining qarshilik kuchi, tog ’ jinsining natijcn’iv qarshiligi, tog ’ jinsi buzilishining chegaraviy kuchlanishi.

It is proposed the model offorce interaction o f the rock destruction tool o f cutting-chipping action (CCA) with rock. Its scope for rock strength for rotary, rotary-percussion and percussion-rotary drilling is demonstrated.

Key words: rotary, rotary-percussion, percussion-rotary drilling, axial force, cutting force, resultant force o f the instrument, penetration resistance, cutting resistance, resulting rock resistance, limit stress for rock failure.