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Naxos grinder dogs grinding controls systems analysis

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Point of tangency dogs filing of neck of crankshaft connecting rod locates with main shaft neck, it is centre of turning circle with line of center of main shaft neck, outfit places the ordinal crankshaft that finish the grinding treatment of neck of all connecting rod, overcame the limitation that exists in treatment of traditional crankshaft grinding. Point of tangency dogs filing of neck of crankshaft connecting rod locates with main shaft neck, it is centre of turning circle with line of center of main shaft neck, outfit places the ordinal crankshaft that finish the grinding treatment of neck of all connecting rod, overcame the limitation that exists in treatment of traditional crankshaft grinding. This kind of method also calls crankshaft grinding of successive contrail numerical control, the implementation means of journal of its grinding connecting rod is to use computerized numerical control (CNC) technology, according to the mathematical model that grinding of built connecting rod journal moves, the transverse feed that controls emery wheel (X axis) move with workpiece circumgyrate (C axis) , two axes linkage controls movement, in order to assure the grinding precision of connecting rod neck and exterior quality. Point of tangency dogs grinding motion characteristic analyses a scheme point of tangency of journal of 1 crankshaft connecting rod dogs grinding sketch map 1 dog for point of tangency grinding motion sketch map. Crankshaft circles O of center of main shaft neck to rotate, axis of X of emery wheel edge reciprocating translation with grinding journal. The coordinate that if the graph is shown 1 times,builds is, have: Take crankshaft to rotate a week will make an on-the-spot investigation, become π of ≤ of 0 ≤ θ / 2 or 3 π / when 2 π of 2< θ ≤ , kv>0, d α / Dt>d θ / Dt; When θ = π / 2 or 3 π of θ = / 2 when, kv = 0, d α / Dt=d θ / Dt; When π / π of 2< θ <3 / 2, kv<0, d α / Dt makes divide evenly when crankshaft so when fast roll, the rotational angular velocity that grinding of the either on connecting rod journal nods is change, namely of time of the unit on neck of the connecting rod when grinding grind divide leading is change. In type (3) in, take B = 35mm, rw=20mm, rn=300mm, criterion if the metabolic trend that Kv of variable of speed of connecting rod neck follows crankshaft corner θ pursues 2 are shown. Graph variable of speed of neck of 2 connecting rod and crankshaft corner relation by the graph 2 can see, although crankshaft makes divide evenly fast roll, but the angular velocity that the grinding on connecting rod neck nods is changing ceaselessly however. We call Kv = 0 when the angular velocity that the grinding on connecting rod neck nods is average angular velocity. When ≤ of 0 ≤ θ 90 when, ≤ of 0 ≤ Kv 0.

1094, the angular velocity that the grinding on connecting rod neck nods is more than average angular velocity, criterion the arc that emery wheel has ground in surface of connecting rod neck paragraph be more than 1/4 circle; When ≤ of 90 ≤ θ 180 when, - 0.

≤ of 1094 ≤ Kv 0, the angular velocity that the grinding on connecting rod neck nods is less than average angular velocity, criterion the arc that emery wheel has ground in surface of connecting rod neck paragraph be less than 1/4 circle; When ≤ of 180 ≤ θ 270 when, - 0.

≤ of 1094 ≤ Kv 0. The angular velocity that the grinding on connecting rod neck nods is less than average angular velocity, the arc that emery wheel has ground in surface of connecting rod neck paragraph also be less than 1/4 circle; When ≤ of 270 ≤ θ 360 when, ≤ of 0 ≤ Kv 0.

1094, the angular velocity that the grinding on connecting rod neck nods is more than average angular velocity, criterion the arc that emery wheel has ground in surface of connecting rod neck paragraph be more than 1/4 circle again. This shows, in crankshaft divide evenly fast roll condition falls, surface of journal of crankshaft connecting rod nods each grind except speed all unequal, because of this unit time grind except rate nodding each unequal also, surface roughness of the dimension precision of neck of this pair of connecting rod, surface and ripple are spent wait to all have bigger effect. Point of tangency of neck of connecting rod of Nextpage implementation crankshaft dogs the control system of grinding 1. If the graph is shown 3 times,structure of hardware of system of control of new-style Naxos grinder controls block diagram of construction of system. Can see from which, naxos grinder is whole control system is formed together by altogether of two computer science departments, it is PC part and NC part respectively, PC part is in charge of data storage of the system, man-machine interface shows, operation of clavier, floppy disk; NC computer part is in charge of control of control of NC data operation, data processing, servo and machine tool PLC. Two computers are in a box, in same bus line inserts a mother board ISO on groove, but inserting groove severally is independence, already was opened by electric segregation, PC is passed between them - MFA1242 of NC interface card and NC - MIO of PC interface card has mutual communication. NC blocks the Profibus bus line that go up to control signal of input of machine tool periphery, output through PLC, among them, measure a system to be MARPOSS P7, also receive NC computer to go up repeatedly through Profibus bus line, according to all sorts of measurement by NC computer case undertakes automata, and all sorts of parameter of MARPOSS P7 are adjusted, the setting is controlled through PC computer, PC strings together buccal cable to add the software of MARPOSS company to add close dog to correspond through COM1, corporation of MARPOSS of the installation on PC is special adjust software, make MARPOSS P7 embedded with one integrated mass of whole control system, control rises very convenient; Have a few important signal only, if safe signal, measuring instrument expresses signal to wait, the collateral interface MIO that passes NC directly blocks control. In the meantime, the computer also has network communication function, can carry network of aether of industry of network interface join, in the MODEM of join of mouth of the general COM2 that string together a mouth of the computer, pass MODEM, also can join Internet, can come true to be diagnosed remotely. Graph 3 control construction of system 2. If the graph is shown 4 times,servo of servo control system controls a system. Servo uses Indramat servo to control a system entirely, emery wheel electric machinery is servo report main shaft, workpiece rotates or so C1, C2 all is servo report main shaft, without mechanical and synchronous axis, take electric and synchronous coder, with electric implementation synchronism rotates; X axis is feed axis, need to dog feed, those who use is linear electric machinery, answer very rapid, can contented dog the requirement of grinding; Transverse Z axis and feed X axis all take the photoelectricity coder of high accuracy, resolution is 0.

1mm. All servo control systematic cent to be two groups, NC controls these servo respectively through two SRCOS card, two SRCOS card all is passed fiber-optic the communication with servo, because,be fiber-optic have high speed and very good interference rejection sex, communication baud law is as high as 4M, the high speed of contented machine tool answers a demand. Graph 4 servo control Nextpage3 of construction of system. If the graph is shown 5 times,bus line of Profibus of machine tool of control of bus line of Profibus of machine tool periphery controls a system. Cent of system of control of whole Profibus bus line is construction of system of control of bus line of graph 5 ProfiBUS advocate station, 6 from the station. Advocate the station gives priority to system of numerical control of numerical control CNC, the address is 70. It is respectively from the station: Operate signal station of face plate I/O, include pushbutton, indicator light to wait, bus line address is 60; Signal station of I/O of machine tool periphery, incorporate signal of the input on machine tool lathe bed, output, bus line address is 40; Measure MARPOSS P7 station, incorporate signal of metrical a few inputs, output, bus line address is 4; Signal station of I/O of ark of machine tool report, include to control signal of a few control, the suction of the protection of air switch, relay closes, a few signal of a few signal of safe relay and driver, bus line address is 10; Signal station of I/O of machine tool hydraulic pressure, include signal of pressure of machine tool hydraulic pressure and signal of electromagnetism a powerful person to wait, bus line address is 10; Signal station of I/O of machine tool hydraulic pressure, include signal of pressure of machine tool hydraulic pressure and signal of electromagnetism a powerful person to wait, bus line address is 50; Signal station of I/O of machine tool pneumatic, include signal of pressure of machine tool pneumatic and signal of pneumatic a powerful person to wait, bus line address is 30. The controls software operating system of machine tool of software compose cost is Windows NT environment, its basically control software to have the following shares. 1. Advocate system of grinding control software advocate grinding control software includes grinding control and man-machine to control two much, this two big control after control system power transmission is started are shown partly come, go to the lavatory to reach the grinding that realizes a machine tool to the operation of the machine tool, man-machine controls the interface that includes a few manipulator beds, if open, stop move emery wheel, the machine tool such as cooling oil controls switch; Grinding control includes emery wheel nap and machine tool to machine grinding automatically a few parts, this a few parts have about 100 its corresponding parameter to install an interface, corresponding to nap CBN emery wheel and grinding crankshaft undertakes installing, after the setting is finished, the machine tool can undertake according to the requirement of the setting emery wheel nap and grinding give the crankshaft of high quality. 2. The PLC program of machine tool of system of diagnostic software of PLC editor monitoring is a machine tool use control movement, processing a few inputs, program that outputs signal, PLC program is started in computer power transmission when, permanent memory, tiring-room moves, PLC program can be started to edit monitoring to diagnose software when need, will undertake breakdown is diagnosed revise with PLC program etc, once PLC program is diagnosed, revise end, had better shut PLC program to edit monitoring to diagnose software, lest affect advocate the traversal speed of grinding control program. (1) servo monitoring diagnoses software system. Of the control of high accuracy position of the machine tool and neck of crankshaft connecting rod dog grinding is to rely on servo to come true, servo is controlled by Indramat servo controller, its relevant control data diagnoses systematic program to come by the servo monitoring of Indramat company monitoring, setting, include all sorts of parameter of drive servo axis among them, soft, hard spacing, after the setting is finished, its data downloads to be in CNC system memory, rely on batteries to save. (2) MARPOSS P7 adjusts monitoring software system. The measurement of the machine tool the system is MARPOSS P7, its control includes axial to measure, the diameter dogs measure, noise monitoring, prevent collision and emery wheel dynamic balancing to wait, CNC system is opposite through Profibus bus line MARPOSS P7 automata, but adjust to its, another special software need when monitoring, the COM1 that passes the computer strings together mouth and MARPOSS P7 to string together a join, when the machine tool needs the MARPOSS P7 that start adjusts monitoring software to undertake installing adjustment, adjust the download after finishing to store to CNC system. This machine tool is in epilogue essence of neck of connecting rod of crankshaft of great horse power of DDi11 of my company engine plant grinds treatment in, the effect is very good, the crankshaft that treatment gives each target is good. Its dog grinding method, reduce facility cost effectively, reduce finished cost, improve treatment precision and manufacturing efficiency. Control system uses labour to accuse machine, versatility is good, accept easily for personnel of large-scale project technology. Accordingly, new to this grinding method and control system have thorough and careful research, have extensive and deep sense. CNC Milling