数铣（The number of milling）.docVIP

数铣（The number of milling） A single choice (please fill in the letter of the correct answer questions after the parentheses, each of 1 points, a total of 40 points, choose the wrong scores.) 1. the worlds first numerical control machine tool was developed in (year). A) 1930, B) 1947, C) 1952, D) 1958 2. one of the rotating shafts of NC machines. The B axis is the axis that rotates around (or) the straight axis. (A) X axis B) Y axis C) Z axis D) W axis 3. according to the control track of machine tool movement, the machining center belongs to (). (A) point control B) line control C) contouring control D) remote control 4. when the boring precision is high, after the rough boring, the cutting heat on the workpiece reaches (), then carries on the fine boring. A) heat balance B) thermal deformation C) thermal expansion D) thermal elongation 5. generally speaking, increasing the process system can effectively reduce the vibration intensity. A) stiffness B) strength C) accuracy D) hardness 6., high speed cutting should use () class hilt. (A) BT40 B) CAT40 C) JT40 D) HSK63A 7. the tool radius compensation instruction is in the return zero state. A) mode B) temporarily erase C) erase D) initial state 8. machine tool fixture according to () classification can be divided into universal fixture, special fixture, modular fixture, etc.. (A) use machine tool type B) to drive the power source of the fixture (C) clamping mode D) degree of specialization 9. parts, as shown, bore holes on the boring parts. The design point of the hole is the C surface, and the design dimension is (100 + 0.15) mm. For clamping convenience, to A surface positioning, according to the process size L adjustment machine tools. Process sizes 280, mm, and 80 mm have been obtained in the previous process, and in the dimension chain of this process as the component ring. The design size (100 + 0.15), which is indirectly obtained by this process, is the closed ring of dimension chain. Size 80, mm and L are ring