10.1007-978-3-319-01845-4_22.pdf
DP31-250机械压力机主机及传动系统设计含6张CAD图
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DP31-250机械压力机主机及传动系统设计含6张CAD图,DP31,250,机械,压力机,主机,传动系统,设计,CAD
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Influence of Mechanical Press Dimensionson its Kinematic BehaviorIulian Taba ra and Constantin DogariuAbstract This paper analyzes the influence of the links dimensions on thekinematics of the knuckle joint press. At the same time, depending on the results ofthe analysis, is accomplished the selection of the manufacturing operation for eachconsidered structure. Modelling the knuckle joint press structures was performedusing SolidWorks application while their operation simulation and determinationof kinematic parameters variation diagrams of the ram was done using SolidWorksMotion model.Keywords Knuckle joint press mechanism?Motion simulation?Suitableoperation1 IntroductionTo achieve optimal technological conditions necessary for the development ofplastic deformation, kinematic assembly of the presses must respect the specificcharacteristics of different processing methods. During operation of the press, thematerial is deformed under the action of the kinematic machine assembly andtherefore the ram speed is obtained from the conditions imposed to its movement.Ram speed has to be maintained in accordance with specific technologicalrequirements of each operation, and towards the end of stroke race is necessary toensure the transition from v = vmaxto v = 0, the system occur without significantdynamic loads.I. Taba ra (&) ? C. DogariuUniversity Politehnica Bucharest, Bucharest, Romaniae-mail: iuliantabaraC. Dogariue-mail: cdogariuI. Visa (ed.), The 11th IFToMM International Symposium on Scienceof Mechanisms and Machines, Mechanisms and Machine Science 18,DOI: 10.1007/978-3-319-01845-4_22, ? Springer International Publishing Switzerland 2014217Processing procedures using mechanical presses are dependent on the tem-perature at which deformation occurs, the speed of the ram, thickness of materialsubjected to processing, dimensional and geometric characteristics of the shape ofthe finished piece, etc. (Al-Arifiet al. 2011; Osakada et al. 2011; Taba ra andTureac 1984; Taba ra et al. 1976; Strano and Albertelli 2011; Der et al. 2007; Reid1991; Oza and Patel 2011; Boerger 2000, 2012).Kinematic parameters variation characteristics of the ram are very important forobtaining a high quality of machined parts. Also, depending on desired operation isimposed a certain interval of rams kinematic parameters of variation as much as acertain aspect corresponding to the requirements of the imposed manufacturingprocess. In this paper it is determined which are the variants of the optimal structureof knuckle joint press depending on the operation which must realized by therespective machines. It will have in view the minimal constructive modification ofthe schemes knuckle joint press schemes but with maximal impact on obtainingsome diagrams of variation conform to the various imposed operations.2 ContentDesigning mechanisms for knuckle joint presses must be done taking into accountprocessing media which it is intended. In this way are taken into account pressesfor operations such as: punching, stamping, forging, pressing powders etc.Kinematics of knuckle joint presses mechanisms determines the choosing of theoptimal solution for each of the plastic deformation operations listed above.This paper addresses only mechanical presses which contain knuckle jointmechanism. Kinematics of these mechanisms depends on their structure, the sizeof its components and in a large measure by their position in space. Next, we insistonly on the last aspect, namely the influence of upper joint position on thekinematics knuckle joint mechanism.For this we consider joint D located at the top (Fig. 1a) in three positions bytranslating it horizontally.In the first version joints D and E are located on the same vertical and determinethe direction of movement of the press ram. This is considered the classicalstructure of the knuckle joint press mechanism.The second version (Fig. 1b) was made considering that D joint is movedopposite to the main shaft of the mechanical press with a distance.The third version (Fig. 1c) was accomplished considering that D joint is movedand placed in a symmetrical position to the one presented in the previous case(Fig. 1b).Kinematic analysis consisted in determining the displacement, velocity andacceleration of the ram of the mechanical press (specifically E joint).Results are represented in Figs. 2, 3 and 4. Figure 2 shows the variation ofdisplacement for a complete cinematic cycle in the three cases mentioned aboveand noted a, b, c.218I. Taba ra and C. DogariuFig. 1 Considered configurations of knuckle joint press mechanism770.9771.5772.2772.8773.4Linear Displacement14 (mm)759762766769772Linear Displacement15 (mm)0.000.200.400.600.801.001.201.401.601.802.00Time (sec)0.000.200.400.600.801.001.201.401.601.802.00Time (sec)0.000.200.400.600.801.001.201.401.601.802.00Time (sec)767769771773775Linear Displacement13 (mm)(a)(b)(c)Fig. 2 Ram displacement function of timeInfluence of Mechanical Press Dimensions219Analyzing the diagrams of ram displacement variation depending on time isshown that the shortest stroke is done in the second case (Fig. 2b) and longest ispresented in the first case (Fig. 2c). These schemes allow the selection of optimalkinematics depending on the operation to be executed by the mechanical press andthe thickness of material to be deformed. Processing characteristic of each oper-ation requires a certain size of the work stroke (deformation stroke) which is notidentical with the entire descendent stroke of the mechanical press.For a same active stroke length, it is found that the contact time between tooland material for processing is the longest in the second case and the shortest in thethird case. Although the duration of contact between tool and work piece is higherin the second case, in this situation there is a noticeable reversal of the ram afterreaching end of the stroke.Note that speed limits vary between low limits (Fig. 3b) but with multiplevariations during the same cycle cinematic which is another reason why thisstructure is recommended to press the pressing powders. 0 5 91419Velocity5 (mm/sec)02579Velocity6 (mm/sec) 0 8152330Velocity7 (mm/sec)0.000.200.400.600.801.001.201.401.601.802.00Time (sec)0.000.200.400.600.801.001.201.401.601.802.00Time (sec)0.000.200.400.600.801.001.201.401.601.802.00Time (sec)(a)(b)(c)Fig. 3 Ram velocity function of time220I. Taba ra and C. DogariuThis solution can be adopted for presses that make pressing powders becausethe specificity of pressing powders consists in the fact that the speed should be lowand the tool return allow stress relaxation and air removal from material particleswhich are pressed followed by a new compaction aimed to give the final shape ofthe product.The third variant (Fig. 3c) show that the contact between tool and work pieceoccurs in a very short time, in this situation, in this situation the press meant to beused for punching operations where displacement and speed are higher than in theprevious case. Unlike the last version, the first version allows contact between tooland work piece over a longer period of time.At the same time the range of velocities and accelerations is reduced withgentle changes of in velocity (Fig. 3a) and acceleration (Fig. 4a) in the first versionin comparison with the third one (Figs. 3c and 4c). Smooth variation of acceler-ation leads to reduced dynamic shock, one of the most important goals pursued inthe operation of mechanical presses. Therefore, this structure is suitable fordrawing and assembly operations by plastic deformation.0.000.200.400.600.801.001.201.401.601.802.00Time (sec)0.000.200.400.600.801.001.201.401.601.802.00Time (sec)0.000.200.400.600.801.001.201.401.601.802.00Time (sec) 223446586Acceleration5 (mm/sec*2) 113263851Acceleration6 (mm/sec*2) 4 34 64 94124Acceleration7 (mm/sec*2)(a)(b)(c)Fig. 4 Ram acceleration function of timeInfluence of Mechanical Press Dimensions2213 ConclusionsIt is noted that using very small changes of position of a joint are obtained importantinfluence upon displacement, position, velocity and acceleration of the workingram. For this reason it is necessary for each project a detailed analysis to determinethe optimal variant to satisfy the requirements of the machining process by plasticdeformation. The press configuration modelling was fulfilled using SolidWorkssoftware and their running simulation and determination of kinematic parametersvariation diagrams of the ram was achieved using SolidWorks Motion model,which allow the selection of the optimal structure according to the kinematicrequirements imposed by each operation performed by plastic deformation.ReferencesAl-ArifiN, Zamani A, Khan J (2011) Billet optimization for steering knuckle using Taguchimethodology. Int J Comp Theory Eng 3(4)Boerger D (2000) The use of link motion on mechanical presses, AIDA-Tech. AIDA-AmericaCorporationDer MT, Hsin PC, Wei CS, Chun YH, Tzuen LC (2007) Performance improvement of a punchingmechanism for flexible printed circuit boards. In: Proceedings of the
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