机床与液压
機床與液壓
궤상여액압
Machine Tool & Hydraulics
2015年
18期
112-117
,共6页
热柱%沟槽形貌%犁切挤压%有限元模拟
熱柱%溝槽形貌%犛切擠壓%有限元模擬
열주%구조형모%리절제압%유한원모의
Heat column%Groove morphology%Plough-extrusion%Finite element simulation
热柱冷凝端的表面结构对其传热性能的影响起着至关重要的作用，粗糙的微沟槽表面形貌有利于强化冷凝。提出了热柱冷凝端表面加工微沟槽的实验加工方法，建立了犁切挤压刀具加工热柱冷凝端的有限元模型。利用 deform 软件模拟犁切挤压刀具加工热柱冷凝端微沟槽，分析了微沟槽的成形过程及机理。有限元模拟结果表明：在加工环状沟槽时冷凝端表面形成了 V 形沟槽，两 V 形沟槽之间形成 U 形沟槽，V 形沟槽两端有鼓包，形成沟槽翅。在轴向沟槽加工时，表面形成了相互正交的微沟槽，呈现许多 U 形微沟槽。进给量和犁切挤压深度对热柱冷凝端微沟槽形貌起着重要作用，犁切挤压深度越大，微沟槽表面形貌越粗糙，但是受刀具强度和刚度的影响，犁切挤压深度不能过大。进给量过大和过小，都不利于微沟槽表面形貌，只有当进给量恰当，才能形成最优的微沟槽表面形貌。
熱柱冷凝耑的錶麵結構對其傳熱性能的影響起著至關重要的作用，粗糙的微溝槽錶麵形貌有利于彊化冷凝。提齣瞭熱柱冷凝耑錶麵加工微溝槽的實驗加工方法，建立瞭犛切擠壓刀具加工熱柱冷凝耑的有限元模型。利用 deform 軟件模擬犛切擠壓刀具加工熱柱冷凝耑微溝槽，分析瞭微溝槽的成形過程及機理。有限元模擬結果錶明：在加工環狀溝槽時冷凝耑錶麵形成瞭 V 形溝槽，兩 V 形溝槽之間形成 U 形溝槽，V 形溝槽兩耑有鼓包，形成溝槽翅。在軸嚮溝槽加工時，錶麵形成瞭相互正交的微溝槽，呈現許多 U 形微溝槽。進給量和犛切擠壓深度對熱柱冷凝耑微溝槽形貌起著重要作用，犛切擠壓深度越大，微溝槽錶麵形貌越粗糙，但是受刀具彊度和剛度的影響，犛切擠壓深度不能過大。進給量過大和過小，都不利于微溝槽錶麵形貌，隻有噹進給量恰噹，纔能形成最優的微溝槽錶麵形貌。
열주냉응단적표면결구대기전열성능적영향기착지관중요적작용，조조적미구조표면형모유리우강화냉응。제출료열주냉응단표면가공미구조적실험가공방법，건립료리절제압도구가공열주냉응단적유한원모형。이용 deform 연건모의리절제압도구가공열주냉응단미구조，분석료미구조적성형과정급궤리。유한원모의결과표명：재가공배상구조시냉응단표면형성료 V 형구조，량 V 형구조지간형성 U 형구조，V 형구조량단유고포，형성구조시。재축향구조가공시，표면형성료상호정교적미구조，정현허다 U 형미구조。진급량화리절제압심도대열주냉응단미구조형모기착중요작용，리절제압심도월대，미구조표면형모월조조，단시수도구강도화강도적영향，리절제압심도불능과대。진급량과대화과소，도불리우미구조표면형모，지유당진급량흡당，재능형성최우적미구조표면형모。
Surface structure of condenser for heat column plays a vital role on its heat transfer performance;micro groove surface roughness is beneficial to the enhancement of condensation and heat transfer performance.The ex-periment machining method of manufacturing micro grooves on condenser surface for heat column is introduced in this paper;a finite element model machining the condenser for heat column by plough-extrusion (P-E)tool is es-tablished,P-E process is simulated using the Deform software;forming process and manufacturing mechanism of micro grooves are analyzed.Experimental results show that feed and P-E depth play important role on surface mor-phology of micro grooves on condenser,V-shaped grooves are formed when machining ringed grooves on the sur-face of condenser,U-shaped grooves are formed between two adjacent V-shaped grooves,there are bumps at two end of V-shaped groove,which form fins.Orthogonal micro grooves are formed on the surface of condenser when axial grooves are processed,which present many U-shaped micro grooves.Feed and P-E depth play important role on micro groove surface morphology:the larger the P-E depth,the coarser micro groove surface morphology. but the P-E depth can’t be too large because the tool intensity and stiffness are limited.It is disadvantage for the forming of micro groove surface morphology when the feed is too large or too little.Only when the feed is right, can be formed excellent micro groove surface morphology.
