The requirement of numerical control machine tool to rigid structure

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  • source:PURELIFE CNC Machining
Dispatch of net of machine tool of Chinese numerical control: The main body orgnaization of numerical control machine tool has the following characteristic: Because 1) used main shaft of high-powered infinitely variable speeds and servo transmission system, the ultimate drive structure of numerical control machine tool simplifies greatly, transmission catenary also shortens greatly; 2) machines productivity to suit to successive automation is machined and rise, structure of machinery of numerical control machine tool has taller static, dynamic stiffness and damp precision, and taller wearability, and heat is out of shape small; 3) chafes to reduce, eliminate transmission clearance and obtain taller treatment precision, used efficient drive disk assembly morely, be like ball guide screw deputy with scroll slideway, disappear unoccupied place positive drive deputy etc; 4) works for improvement condition, reduce auxiliary time, improvement to operate a gender, improve labor productivity, used cutting tool library of automatic clamp device, knife and trade the auxiliary unit such as knife device and unit of automatic platoon bit automatically. According to the applicable circumstance of numerical control machine tool and orgnaization characteristic, because raise the following requirement,logarithm controls machine tool construction: 1, taller machine tool is static, the statement that uses data-in means to offer according to numerical control process designing or hand undertakes use machine tool of numerical control of stiffness 　 　 automatically machining. As a result of rigid structure (wait like machine tool lathe bed, slideway, workbench, tool carrier and main shaft box) geometrical precision and in be out of shape the fixed position error of generation is machining a process, cannot adjust for the ground with compensation, accordingly, must everywhere the flexibility that rigid structure part produces is out of shape control is in minimal inside, in order to assure the treatment precision of a requirement and exterior quality. 2, the heat that reduces a machine tool is out of shape 　 　 is below the influence of heat source of inside and outside, each component will produce the machine tool the heat of different level is out of shape, make the opposite motion concern between workpiece and cutting tool breaks ring, also be machine tool quarter drops. To numerical control machine tool, because full treatment process is calculative instruction pilot, hot metabolic effect is more serious. Be out of shape to reduce heat, adopt the following measure normally in structure of numerical control machine tool. (1) decrease calorific; (2) control temperature rise; (3) improve machine tool orgnaization. 3, reduce motion to chafe and eliminate workbench of machine tool of numerical control of 　 of transmission clearance 　 between (or procrastinate board) displacement measures the equivalent in 11 arteries and veins to be most of subsection, ask again normally can move with the speed of base. To make workbench can right the instruction of numerical control device is made accurate answer, must take corresponding step. Slideway of current and commonly used sliding slideway, scroll and static press slideway to existing in respect of attrition damp character apparent difference. Slip guide screw is replaced to also can get similar result with ball guide screw in feed system. Current, numerical control machine tool uses transmission of ball guide screw without an other place almost. Numerical control machine tool (especially the numerical control machine tool of open loop system) treatment precision depends on greatly the precision of feed drive catenary. Besides the machining error that reduces transmission gear and ball guide screw, another important step is to use unoccupied place transmission of very close to each other deputy. The accumulation to pitch of ball guide screw error, use pulse to compensate device to undertake pitch is compensated normally. 4, the life that improves a machine tool and precision maintain sexual 　 　 to maintain a gender to raise the life of the machine tool and precision, in the wearability that component of airport of mature numerical control answers when the design, especially the wearability of the component of main shaft of chance of port of wait of machine tool slideway, feed main part that affects plan. In use process, should assure numerical control machine tool each part is lubricant and good. 5, those who reduce auxiliary time and improvement to operate machine tool of numerical control of function 　 　 is odd a treatment is medium, auxiliary time (be not the time that cut bits) have larger proportion. Want to improve the productivity of the machine tool further, must adopt make utmost ground reduce auxiliary time. At present already machine tool of a lot of numerical control used much main shaft, much tool carrier, and those who take knife library is automatic the device that change a knife, change knife time in order to decrease. To cutting the numerical control machine tool that bits dosage increases, lathe bed orgnaization must be helpful for discharging bits. CNC Milling