Finite yuan of application in plank rolling process

1 armor plate quickens analysis of stress of the remains in cooling process to quicken cooling craft to apply extensively at producing high strenth, tall tenacity and the board that have good weldability, but the client mirrors armor plate generally however to contain particular leftover stress, affect follow-up treatment. Use here finite yuan of leftover stress that the method analysed the armor plate in accelerating cooling process, and amid embedded user subprogram, reflected become right the influence of mechanical function. 2.

1.

1 finite base used yuan of model model medium plate width is 3.

The low carbon microalloy of 5m steel, ply is 20mm, 30mm, 40mm and 50mm respectively. Be economic calculation time and ensure computational precision, the length of board base is 4m surely, width direction takes a half to undertake an analysis by symmetrical face, if pursue,1 is shown. The mechanical function of material comes true through the user subprogram of software, considered cooling rate, photograph changes reach change the influence of temperature. Graph reseau of 1 board base differentiates to be cooling process cent two phase, begin to undertake the gush water of 10s cools from 750 ℃ above all, the air that has the 2nd level next is cold. To the board base with large 20mm, the average cooling rate of water-cooling is 25 ℃ about / S, cooling to average temperature 500 ℃ end. When the twist of the armor plate after analysing cut is out of shape, used the function of the Element Remove in ABAQUS. As preliminary research, calculated only the condition that cuts edge width to be 500mm. 2.

1.

Studied different and initiative state adjusts board semifinished product here the influence of leftover stress, the initiative state of board base includes initiative temperature to distributing reach board base protruding to spend. Initiative temperature distributings include whole of 750 ℃ distributing equably with frontier department 750 ℃ are in 710 ℃ , core what width direction shows parabola trend is inhomogenous distributing. Board base protruding is spent is fingerplate base mid the poor value with frontier department ply, studied protruding is spent respectively here for 0mm, 0.

25mm, 0.

The circumstance of 5mm and 1mm. In actual production, initiative temperature distributings equably, protruding spends be the circumstance of 0 is impossible existence, this kind of circumstance just serves as imitate consult relative basis. Main analysis ply is the board base of 20mm here, in order to clarifies the initiative state temperature change to cooling process, leftover stress distributings, the batten after cut is out of shape the influence of the circumstance. 2.

1.

3 computation result 1.

Initiative state spends B initiative temperature to spend protruding of D of distributinging C ply to the influence A protruding of board base temperature with initiative temperature distributinging chart all sorts of 2 elements are opposite the influence of typical node temperature after the influence graph 2-a of temperature of water-cooling backboard base revealed protruding to spend pair of board base water-cooling. Temperature of the core after the addition that protruding spends brought about water-cooling is higher, and subtense ministry and impact of horny ministry temperature are not big. Initiative temperature distributings to be like graph 2-b place to show to the influence of temperature of node of model of water-cooling backboard base. In core, temperature does not have too big difference, and the temperature difference of frontier department and horny ministry is bigger, initiative temperature distributings the ministry side inhomogenous board base and horny ministry temperature are inferior, it is especially after water-cooling. To the board base that initiative temperature distributings equably, the difference in temperature of frontier department and core is 386 ℃ , the difference in temperature of horny ministry and core is 424 ℃ ; To the board base that initiative temperature blame distributings equably, difference in temperature is mixed for 393 ℃ respectively 429 ℃ . Although the initiative condition of board base has certain effect to the generation of leftover stress,the analysis of above makes clear, but the inhomogenous cooling ability of water-cooling phase is main reason. To thick board, the inhomogenous sex of this kind of water-cooling should be more than thin plate. Have different ply, protruding to spend for 1mm, initiative temperature inhomogenous distributinging circumstance is like the temperature after the water-cooling of board base 10s that distributing graph 2-c place is shown. As board thick addition, the temperature of frontier department and horny ministry does not have apparent change, however the temperature of core changed from 535 ℃ however 735 ℃ . This kind of difference in temperature that causes by board base ply should is more than far spend the difference in temperature that cause by initiative temperature and protruding, will cause the leftover stress with the larger generation in board base. 2.

Leftover stress distributings after reaching cut, be out of shape attrib wattly edge of circumstance board base is fore-and-aft after cut, the leftover stress of section is able to release, batten happening is out of shape, if pursue 3 with the graph 4 are shown. In 0 what cut is over.

On the batten with wide 5m, leftover stress changes to make an appointment with 60MPa from 200MPa left and right sides, frontier department and the stress cost that carry a department are inferior. Graph the 7 batten that revealed cut to come down are in 1 direction (width direction) displacement. The displacement value that approachs frontier department is, and the displacement value that approachs cut range is negative. Of two end displacement value should is more than mid, and the absolute value that the negative displacement of two end is worth should is less than mid, attrib wattle mid and outward side happens bend. Initiative temperature distributings inhomogenous batten is out of shape a few bigger. Graph the leftover stress graph of the batten after 3 cut is out of shape attrib wattly after 4 cut circumstance 2.

Process of 2 plank rolling conducts heat before the analysis is designing rolling mill, need computation delivered how many quantity of heat to give roller in the rolled piece when rolling, this is having important sense to the design of roller. Here, rolling process every second press next rate to ask to be compared big, the rate below tired keep long in stock was achieved 95% , outspread on length direction rate achieved 26 times. Graph 5 it is the reseau before rolling distributings, graph the 6 reseau that are rolling hind distributing. Used here " DISTORTION CONTROL " , make computation won't have been out of shape because of reseau big and stop. Graph the reseau before 5 rolling distributings graph the reseau before 6 rolling distributings below it is finite yuan of result that computation gets, among them if the graph is shown 8 times,second rolled piece distributings in the first temperature that nods each with the 2nd temporary lodging during a trip that be pressed, calculate the temperature that received roll changes, these results had direct effect to producing a design. Graph A of signal of 7 typical node the first second B the 2nd second graph temperature of 8 rolled piece distributings 2.

3It is contemporary and clement that control of appearance of MAS rolling plane analyses planar appearance to control a technology board one of technologies of sex of rolling mill mark. Abroad already used the planar appearance such as MAS to control a technology to rise clement board become a useful person rate. This technology carries the amount of planar appearance change that calculates cease of rolling of every armor plate, give out to press next quantities accordingly to control what roller seams to leave degree in order to change the ply of board base, make the planar appearance of armor plate becomes rectangle finally. Control process is as follows: (1) gets frontier department and the metabolic amount of the appearance that carry a department by forecast model, its conversion finally into figuration rolling second board thick distributing; (The 2) the last path in figuration rolling second in, direction of length giving an edge nods the ply difference with the regulation each accordingly, if pursue 9 type; The ply of rolling of graph 9 MAS distributings (3) board base turn 90 ° have spreading rolling, as a result of wide differ to ply, arrive from board edge board of the center press next rate to also differ, make planar appearance is able to improve thereby. The appearance after rolling is shown 10 times like the graph. Rolling of graph 10 MAS is final the point of law of rolling of board form MAS is accurate forecast eventually the appearance after make friends, ration obtains the planar appearance change in rolling process. With finite the metallic flow of process of yuan of rolling of methodological analysis MAS is out of shape rise to coaching production is reached become a useful person lead the real significance with all be had particular. 3 conclusion and experience as the computer soft hardware technology and finite the development of yuan of computation technology, finite yuan of law in board belt the application of rolling problem respect is more mature already. In in thick board use in hot-rolling figuration process finite yuan it is OK that the method undertakes numeric imitate is analysed offer reasonable craft parameter for actual production, quicken new material new technology to develop rate, accurate beforehand appraise, better implementation design, reduce the amount of physical model, reduce development cost. Anyhow is in each respects are adumbrative, finite yuan of effect with will be developed main in each link of plank rolling. CNC Milling CNC Machining