【摘要】：圓環(huán)鏈條經(jīng)過(guò)熱處理可以有效地提高產(chǎn)品的質(zhì)量和性能,而電磁感應(yīng)加熱作為一種清潔的加熱方式,日益受到企業(yè)的歡迎。圓環(huán)鏈條加熱設(shè)備不同的工藝參數(shù)會(huì)影響著鏈條溫度的變化,而溫度會(huì)直接影響鏈條內(nèi)鐵素體和珠光體對(duì)奧氏體的轉(zhuǎn)變,因此需要研究不同工藝參數(shù)對(duì)鏈條加熱效果的影響,通過(guò)對(duì)圓環(huán)鏈條加熱過(guò)程進(jìn)行數(shù)值模擬,可以更好地掌握設(shè)備熱處理的工藝過(guò)程。針對(duì)不同規(guī)格鏈條熱處理時(shí)需安裝對(duì)應(yīng)規(guī)格的傳動(dòng)輪而造成其效率低的問(wèn)題,采用摩擦輪式的傳動(dòng)方式對(duì)設(shè)備結(jié)構(gòu)進(jìn)行了改進(jìn),有效地克服了傳統(tǒng)輪系的弊端,并給出了設(shè)備改進(jìn)后的鏈條處理結(jié)構(gòu)示意圖,簡(jiǎn)單地介紹了結(jié)構(gòu)運(yùn)行的原理和優(yōu)點(diǎn)。利用有限元法建立了鏈條三維電磁-熱耦合計(jì)算模型,通過(guò)分析鏈條升溫過(guò)程中渦流及焦耳熱在鏈環(huán)內(nèi)的分布,研究了鏈環(huán)溫度場(chǎng)的變化規(guī)律,所得結(jié)果與實(shí)驗(yàn)測(cè)試結(jié)果基本相吻合。研究了頻率、電流密度、線圈與鏈條的間距等不同工藝參數(shù)對(duì)鏈環(huán)升溫的影響,得出以下結(jié)論:(1)增加電源頻率,鏈環(huán)會(huì)升溫越迅速,鏈環(huán)表面溫度越高,導(dǎo)致與中心處溫差越大,加熱的均勻性變差。(2)增加電流密度,雖然不能改變鏈環(huán)溫度場(chǎng)的分布,但是鏈環(huán)表面溫度同樣也升高的迅速,與中心處的溫差增加,加熱的均勻性變差。(3)增加線圈與鏈條的間距,鏈條的升溫會(huì)變慢,增加感應(yīng)所需要的時(shí)間,會(huì)導(dǎo)致表面容易被氧化。本文對(duì)傳統(tǒng)的圓環(huán)鏈條熱處理設(shè)備的傳動(dòng)結(jié)構(gòu)進(jìn)行了改進(jìn),提高了鏈條熱處理的工作效率,并對(duì)鏈條熱處理工藝開(kāi)展了電磁-熱的耦合分析研究,分析了其工藝參數(shù)對(duì)鏈環(huán)加熱的影響,對(duì)實(shí)際生產(chǎn)具有一定的參考意義。
[Abstract]:The heat treatment of circular chain strip can effectively improve the quality and performance of the product. As a clean heating method, electromagnetic induction heating is increasingly welcomed by enterprises. The change of chain temperature will be affected by the different process parameters of circular chain heating equipment, and the temperature will directly affect the transformation of austenite from ferrite and pearlite in chain, so it is necessary to study the influence of different process parameters on chain heating effect. The process of heat treatment of the equipment can be better grasped by numerical simulation of the heating process of the circular chain strip. In order to solve the problem of low efficiency caused by the installation of transmission wheel with corresponding specifications during heat treatment of chain with different specifications, the structure of the equipment is improved by using the transmission mode of friction wheel, which effectively overcomes the disadvantages of traditional gear train. The schematic diagram of the chain processing structure after the improvement of the equipment is given, and the principle and advantages of the structure operation are briefly introduced. Based on the finite element method, a three-dimensional electromagnetic heat coupling calculation model of chain is established. By analyzing the distribution of eddy current and joule heat in the chain during the chain heating process, the variation law of the chain temperature field is studied. The results are in good agreement with the experimental results. The effects of different technological parameters, such as frequency, current density and the distance between coil and chain, on the temperature rise of the chain are studied. The following conclusions are drawn: (1) if the frequency of the power supply is increased, the temperature of the chain will increase more quickly, and the surface temperature of the chain will be higher. The larger the temperature difference with the center, the worse the uniformity of heating. (2) increase the current density, although it can not change the distribution of the temperature field of the chain, but the surface temperature of the chain also rises rapidly, and the temperature difference increases with the temperature at the center. (3) increasing the distance between the coil and the chain will slow the chain temperature and increase the time required for induction, which will lead to the surface oxidation easily. In this paper, the transmission structure of traditional circular chain heat treatment equipment has been improved, and the working efficiency of chain heat treatment has been improved, and the electromagnetic-thermal coupling analysis of chain heat treatment technology has been carried out. The influence of the process parameters on the heating of the chain ring is analyzed, which has a certain reference significance for the actual production.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM924.01

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本文編號(hào)：2221757