Numerical control of machine tool of entrance machining center is transformed

01mm, the precision between Kong Zhi is ± 0.

03mm. The treatment requirement according to the product and logarithm of product development trend accuse to transform a requirement to be as follows: The system needs to realize 3 axes linkage and random 2 axes linkage; Machine precision to make sure the machine tool locates precision is mixed, unit of the smallest set is requirement system 1µm; Speed of each coordinate speed is the machine tool 12m/min, feed speed is 5m/min, repeat fixed position precision to be 4µm. This answers speed and precision to have higher demand to servo; Choose the knife, requirement that changes the action such as exchange of knife, splint to satisfy, the system is due input 72 a little bit, output 56 a little bit; Control a demand to satisfy other to assist, CNC system wants 64 inputs dot, 24 output place, because this control is due,136 inputs are nodded, 80 output a dot; Main shaft rotate speed asks to be 10 ～ 3500r/min, power is 11kW. Because the mechanical section of the machine tool is whole,the numerical control of 2 SABO- machining center is transformed, when be being transformed accordingly, in machinery the part transforms the connection part of electric machinery only. Additional, go to the lavatory to be maintained later and unified, original knife library medium proportioning valve converts domestic electromagnetism a powerful person is replaced. Driving unit of main shaft of main shaft drive chooses driving unit of Japanese An Chuan CIMR-VMS2015, main shaft electric machinery is An Chuan UAASXA-15CZ1, power 11kW/15kW, run 11kW continuously, 30min moves amount to 15kW, 1500r/min of rated rotate speed, 6000r/min of top rotate speed. Instruction of servo of this main shaft uses tension of 0 ～ 10V, cooperate to inverting instruction, the positive and negative that realizes main shaft electric machinery turns. This main shaft still contains directional function, by magnetic induction switch, amplifier, directional card and main shaft directional command signal realizes main shaft directional. This main shaft is constant torsion timing below in rated rotate speed, above of rated rotate speed is constant power timing. Main shaft machinery has 4 archives speed change, main shaft / score of gearshift of main shaft electric machinery is not 1:1, 1:2, 1:4, 1:8, be about to cent of main shaft speed is 4 limits: ≤ of 0 ＜ S 306r/min, gear ratio is 1:8; ≤ of 307 ＜ S 689r/min, gear ratio is 1:4; 1539r/min of ≤ of 690 ＜ S, gear ratio is 1:2; 4000r/min of ≤ of 1540 ＜ S, gear ratio is 1:1. By go up knowable, because main shaft electric machinery and mechanical shift gears close suitably, although main shaft rotate speed is when low speed, the rotate speed of main shaft electric machinery also can maintain inside taller rotate speed limits, assured the cutting power of main shaft thereby, rose to machine precision. By S the instruction realizes gearshift of main shaft electric machinery and mechanical shift gears. The communication synchronism electric machinery that servo drive electric machinery and driving unit electric machinery choose plant of Lanzhou electric machinery, axis of X, Y is 27N · M, z axis is 37N · M, top rotate speed is 2000r/min. The HSV that driving unit chooses our company to produce, driving unit of 11D communication servo. This unit applies vector to control principle and flexible control technology, make this servo module structure simple, it is easy to debug, control is quick, safeguard convenient, bulk is cabinet. This unit is divided outside can realizing servo of high accuracy position to control, also can use as pitching moment control equipment, still can regard as the timing device of wide range is used. The main parameter of HSV-11D is: Speed controls limits ＞ 1:3000; The position controls precision to be ± 1µm, 2000r/min of top rotate speed, instruction means: Act buccal means, pulse means, imitate way. Protective function has feedback to break a string, flow too, overheat, owe pressure, the hardware breakdown protection such as short circuit, and a certain number of software protection. The instruction means that uses in this system is serial interface and host computer online communication, with RS-232C standard (4 strings of mouth board) the interface circuit that signal photograph matchs. System of numerical control of numerical control system is used China in system of Ⅰ numerical control, its are main the characteristic is: Accuse with current project machine for the open mode of core the much task of architecture, real time controls a system. The system basically is configured for 486CPU, 4MB memory. It is to have system of 4 passageways numerical control, every passageway has an interpreter, finish linear, circular arc, helix, the explanation such as tap. Software platform with MS, DOS is a foundation, the NCBIOS(that develops through proper motion is basic input / output) achieve task administration, attemper, administrative CNC system all exterior control objects, include control of equipment driver management, position, PLC to attemper, interpolation computation and in-house monitoring. This system writes PLC program with C language, fine is agile, process designing is easy, although not as good as echelon graph and the PLC programming language that the statement expresses are intuitionistic, but can have simple and accurate description to particularly complex process. PLC1 of PLC program cent, PLC2 two stature programs. PLC1 every 16ms is called. PLC2 every 64ms is called. Ask to real time sex tall control is in PLC1, for example the control such as knife library, main shaft, manipulator. PLC2 the wave band switch on Control Panel and indicator light. The control of knife library this machining center uses hydraulic pressure a powerful person to realize control of knife library sport. Knife library answers 0 programs block diagram to see a picture 2. Way of knife library movement has: Knife library is turning, invert, speed. Through, invert, can realize nearby to pick a knife. Knife library controls cent to be: Knife library is answered 0, pick a knife 2 much. The signal that controls knife library movement has library of signal of fixed position of library of pulse of computation of library of knife library origin, knife, knife, knife library of loose, knife inputs library of fixed, knife wait for signal. Signal all by give out without contact switch. Because knife library locates signal link stopper has certain breadth, so, make when knife library when turning, cannot locate accurately. For this, we are used turning when knife library after receiving signal of knife library fixed position, make knife library inverts, when getting signal of knife library fixed position again, command knife library suspends campaign, knife library fixed position sells ability to insert, knife library is fixed. This system uses random type cutting tool to deposit means, namely cutting tool can be deposited knife time is changed in order to save inside aleatoric broach shell. Cutting tool deposits the position to be remembered automatically by the system, the system after changing a knife updates knife library automatically to express. Precision of the machine tool after the 3 circumstances after transforming are transformed had rise apparently, repeat fixed position precision to achieve 5µm. For example primary machine tool can undertake rough machining to lid of diesel engine crock only, the rough machining after transforming and finish machining can be finished on same machine tool. The function of the machine tool is morer than in the past, the operation is more convenient, rose to machine efficiency, reduced machine down time. Axis of the X before transforming, Y, Z moves quickly speed is 10000mm/min, after transforming their move quickly speed is 15000mm/min; Floppy disk and hard disk increased after transforming, make order input more convenient. After transforming, to diesel engine crock lid underside undertakes mill end panel, wide choice bores hole, need altogether change 12 knives to finish, treatment efficiency raised 3 times. Save the cost that buys new facility. Purchase to need many yuan 200 with norms machining center, and transform a machining center to need 310 thousand yuan only. Pass milling machine of pair of constant bavin profile modeling and machine tool of 8 machining center to transform, the company is changed to the numerical control of equipment transform established confidence, realise this is a when raise an enterprise to machine equipment ability good way. The plan is being transformed below is to continue to transform existing machining center, form the machining center that already transformed now " diesel engine airframe is flexible product line " . This project already was approved to be by commission of national economy trade national technology innovated 1998 project. CNC Milling