Brace flies cut orgnaization motion and control principle analysis

2 document label piles up: B flies cutting is the important and auxiliary equipment that marvellous wire connects make friends product line, use at cutting a head, cut end, accident to break reach finished product times feet disjunction is cut. Because fly,cutting is in great ability in moving, cut, the assigns speed and rolled piece motion rate that reason must satisfy Jian Ren to go up in horizontal way asks synchronously. The type of a brace after some steelworks joins machine of roughing of make friends product line flies cut presence the following problem. L. Cut fast fall big, be forced to use 1.

07~1.

15 serious offences fast factor, ability ensures cut head and accident break, but cause mechanical and oscillatory Dajuan peg of complete shaft coupling is defeated often, brace linkage mechanism wears away badly; 2. Cut the head, be no longer in force that cut trail from time to tome, cut trail ceaseless, have appearance of with one's hands behind one's back occasionally even. One, brace type flies the kinematic analysis that cuts an orgnaization 1.

The synchronous gear that the reducer casing of planet of classics of rotational moment of force that Jian Ren runs orbit electric machinery delivers a pair of outfit to go up in crankshaft, make brace type flies next shears brace and on brace makes suitable hour hand and anticlockwise motion respectively. Flying cut when be about to cut to rolled piece, mark place of place v/arc be on the throne for S0, press then on, next brace every turn 5 ° are variable, the corresponding position that will cut blade respectively is ordinal write down for S1, S2, S3... S72, straight next consummate, brace turn till 36 ° . them join rises finally, get two approximate ellipse that close fly cut Jian Ren to run orbit, if pursue,1 is shown. 2.

The metabolic brace type of the horizontal displacement that cuts Duan Jianren and its speed flies be in when the brace that cut is dormant fixed position, be in namely original position HP (see a picture 1) . When cutting, brace is quickened with the biggest acceleration from place of original position HP, by fixed position control system control moves to cut positional CP, fly right now cut Jian Ren X of horizontal speed υ is equal to M of υ of rolled piece speed. Proper design should make Jian Ren is in cut Duan Zunshui moves flatly and perpendicular when the overlay that cuts moves, cut without swing. The banking angle β that cuts blade namely is approximately 0, fly at the same time cut Jian Ren to make constant speed cut with υ P to cut finish (CRDY) , begin decelerate next, by fixed position brace of control system control is stopped to be in HP, wait to be cut the next time. When be cut actually, fall to make up for the instant to cut rate, need to pass fast gene normally, namely υ X=(1~1.

M of 05) υ . Because brace is in,cut paragraph it is to make constant speed roll, reason can be made with coordinate law fly cut in cut paragraph displacement of Jian Ren level (Six) for a short while (T) watch; Listed Jian Ren is worth Six and Jian Ren to be in in the horizontal displacement that cuts change of Duan Sui time each time paragraph the level is average speed υ Ix. Banking angle β is worth Jian Ren can get through constructive law actual measurement. From this knowable: (Data of 1) β horn makes clear, from the S0 that begins to cut to the S10 that cuts an end (CP comes between CRDY) , jian Ren is in perpendicular position basically, its are the biggest slant place part for 0.

959 ° , cut blade gradient to be close to Yu Ling namely. Accordingly, graph 1 in υ X is approximate also at υ X ′ . (2) flies cut brace to be in cut Duan Zunheng when fast motion, flying scissors blade is measured in the horizontal displacement inside unit time increase by degrees stage by stage, namely edge is to be being made move quickly, this is beneficial to make up for or offsetting the rate that cut and produces falls. Notable is, too big acceleration can be in cut the instant to produce bigger impact, had arisen in rolled piece interior big pull stress and affect rolled piece immanent quality. The need in producing a course is used 1.

07~1.

Fast factor just can assure 15 serious offences cut head and break. The specification flies cut during cut the rate with very large presence falls, because this is necessary pair of electric control principles and orgnaization force can parameter undertakes an analysis. 2, electric control principle and force can parameter is analysed 1. Analysis of electric control principle flies cutting is to carry ring of electric current, speed, position by inside 3 link have outside arriving of closed-loop control (see a picture 2) . Cut Jian Ren to be inside the shortest time to let fly from 0 want rate to place quickly, adjuster of level electric current is cut to CP in HP LT is saturated, fly cut electric machinery to be quickened with Idmax of armature electric current, in cut reach υ P value, undertake cutting coming cutting finishing with this speed; Arrive from CRDY HP phase with electric current advocate the means with retrorse loop is used - value of Idmax electric current has retarding brake, till return to,arrive HP. Cut every time, circumferential go up to nod the position and speed to feedback respectively each positional annulus and speed annulus. The control process of adjuster of electric current, speed by the DDC in DCV700 of dc timing system (direct figure controls a system) finish, positional adjuster is in PLC260 system by the DS-DP140 that takes microprocessor board through POSR-H1 and POSW-H1 special program module undertakes the position is read keep an operation, pass screen double skeining thread to convey with imitate signal directly next to the APC in DCV700 interface board undertakes speed allocation, whole process accords with closed circuit of fast fixed position best pilot requirement. Below still have the aid of pursues 1 fly with cutting the head, movement that cut trail typically to narrate cut control principle. Nextpage flies the control that cuts the head, movement that cut trail by length time beforehand buy, spark start, cut control composition of 3 big functions, its head, rear cuts time Th, Tt to be: In type: L, HMD is apart from M to what cut a CP; Lh, set cuts head length M; Lt, set cuts end length M; R, fly cut brace radius M; D, M of rolled piece diameter; S, go up, M of next length of Jian Ren jackknife; υ M, M/sTf of rolled piece speed, flying Jian Congqi is moved to CP what need time S. However, beforehand the computation of buy time is not quite accurate, because MP260 controls program scanning,to HMD signal change is apart from HMD to detect the specific time that produces change to the signal after Gong Gang has an error. The executive time that controls a process by PLC causes this error, if ABB system is medium,this value is 200ms. For this, accurate head, end cuts beforehand buy time is type of T2 of △ of Tl- of △ of = Tt- of ′ of T2 Tt of △ of Tl- of △ of Th ′ =th- in: △ Tl, the sampling hour that the system changes to HMD signal and HMD detect actually the time that signal changes is wrong; △ T2, fly the lag time that cuts the hour that start, it is 2~4ms commonly. PLC260 system times to DSDP150 by module of START-H1 special program board of the ′ that press Th and Tt ′ beforehand buy time has count, arrive book time hind to give DS-DP140 by the DO signal in DSDP150 board give out cut the command that start to undertake cutting, the DSDP140 in moving process gives the seat through module of POSW-H1 special program, get by POSR-H1 fly cut positional feedback. The photoelectricity pulse generator that voltaic feedback and speed feedback to pass transformer of electric current of the armature in SCR bridge and installation to go up in electric machinery take-off respectively is gotten. The analysis makes clear as a result, electric control is accurate and reliable. 2. Force can parameter analysis was eliminating to fly after cutting the exists possibly issue on electric control, will analyse machinery and electric energy again can of parameter match have without the problem. Normally the circumstance falls, fly cutting the M of shearing force quadrature that needs when the marvellous timber that cuts certain section to cut is constant, cut do work through electric machinery will finish. Accordingly, in rolling speed particular case falls, according to dc machine base fast the character that moment of force of the following constant runs, raise value of I of reducer casing speed ratio to be able to increase fly shears shearing force quadrature, of course the rotate speed of electric machinery also needs to rise into scale ground. Can see, steelworks shows some flying to cut 220r/min of rotate speed of actual electric machinery and electric machinery base fast 780r/min difference is very big, restricted the play of ability of this electric machinery greatly thereby, cause fly cut shearing force quadrature to be not worth, generation fast fall. Correct brace flies cut a design to should make dc machine is stood by in area of constant moment of force base fast area moves. 3, improve measure 1. Raise reducer casing speed ratio, increase fly because fly,cut shearing force quadrature cut a design to use planetary gear reducer casing, accept the restriction of date of baseplate of former reducer casing, below the premise that does not transform equipment base, the speed ratio reducer casing by 3.

15 rise 4.

5, make shearing force rules increased accordingly thereby 43% , electric machinery is in cut paragraph actual rotate speed achieves 314r/min. If combine equipment foundation to transform, reducer casing speed ratio can be chosen 10, right now electric machinery is in cut paragraph actual rotate speed can achieve 700r/min to control, achieve fly cut electric machinery to be stood by in area of constant moment of force base the requirement that fast area runs, make shearing force rules increases double above accordingly. 2. Adjust speed is installed and cut the head, length that cut trail (1) wears away when Jian Ren make overlap the quantity disappears, and speed of the level that cut trail and rolled piece speed when just in time is same, happen cut trail ceaseless. Increasing jackknife shears blade to spend is unwise. Those who change rolled piece cut end to be " card is broken " means, set rate into 0 when cutting a head.

75~0.

80 times, ensure horizontal speed of Jian Ren, the problem gets settlement. (2) cuts the head, length that cuts trail to flying the setting is undeserved, or tapping rhythm is too fast, red base head chases after end to cause fly metal length heat is measured to accuse to measure before cutting implement HMD " 0 " , " 1 " signal switch is difficult, or control program cannot differentiate inside the program cycle of 200ms signal changes, can cause cut the head, be no longer in force that cut trail. Settlement measure is, proper setting cuts the head, length that cut trail, tapping interval control is controlled in 4s. 3. Had reduced fast factor, improve component to install means to fly cut fixed position to control circuit and its component breakdown to basically be breakdown of LPG of generator of pulse of breakdown of control plate of DS-DP140 fixed position, fixed position to wait. Use a serious offence especially when fast factor is cut, because fly,cut in cut the instant to bearing acceleration acuteness change, make mechanical component produces intense vibration, bring about report to accuse signal to serve as reference point " Z " pulse is missing, cause cut repeatedly even a traditional method of indicating the pronunciation of a Chinese character by using two other Chinese characters. Solve measure to have: (Speed ratio of 1) reducer casing rises 43% , fly after cutting shearing force quadrature to increase accordingly, when will cutting a head cross fast factor set to be in 0.

92~0.

96 between, small cost is taken as far as possible when be being operated actually, make cut a head thereby, cut end, broken break become very smooth, vibration is reduced, mechanical blame wears away normally, defeat also immediately is eliminated; (2) improves fixed position pulse implement the installation means of LPG, use flexible shaft coupling connection, reduce machinery to pound the vibration influence to LPG. 4, the last word flies to brace type shears kinematics of mechanism and automata principle undertake analytic study, can cut the head, set that cuts end to cross fast factor to be worth to provide academic basis to fly. Afore-mentioned fly in what use cut reducer casing primary speed ratio 3.

The department of make choice of of 15 designs a mistake. Because accept a condition,limitative speed ratio increases only 4.

5, although be not the best value, but the requirement that already can satisfy actual production completely. CNC Milling