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Bulletin of the Polytechnic Institute of Iași. Machine constructions Section最新文献

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Use of the 3-Level Idea Diagram Method to Identify Constructive Solutions for the Development of a Thermoforming Mould 利用三层概念图法确定热成型模具开发的建设性解决方案
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-12-01 DOI: 10.2478/bipcm-2022-0031
M. Boca, A. Sover, L. Slătineanu
{"title":"Use of the 3-Level Idea Diagram Method to Identify Constructive Solutions for the Development of a Thermoforming Mould","authors":"M. Boca, A. Sover, L. Slătineanu","doi":"10.2478/bipcm-2022-0031","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0031","url":null,"abstract":"Abstract Thermoforming is one of the oldest technologies for the manufacture of plastic products. This originates in prehistory, but today, new additive manufacturing technologies can contribute to the production of moulds, tools, or accessories, which can be used in other traditional manufacturing processes. Manufacturing such moulds for thermoforming is a challenging technical problem due to the multitude of equipment, materials, design, and process constraints that must be considered. To identify and organize the large amount of information, it is imperative to implement a method based on stimulating technical creativity. Following the application of the 3-level idea diagram method, the material resources susceptible to experimental testing are established and include equipment, software, materials, tools, and accessories. The current study resulted in the manufacture of a new product that does not exist on the market, namely a thermoformed desktop business card holder.","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115500044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Empirical Modeling of Heat Transfer in Cylindrical Polymer Rods Manufactured by 3D Printing 3D打印圆柱形聚合物棒传热的经验建模
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-12-01 DOI: 10.2478/bipcm-2022-0033
A. Hrițuc, A. Mihalache, L. Slătineanu, O. Dodun, G. Nagîț
{"title":"Empirical Modeling of Heat Transfer in Cylindrical Polymer Rods Manufactured by 3D Printing","authors":"A. Hrițuc, A. Mihalache, L. Slătineanu, O. Dodun, G. Nagîț","doi":"10.2478/bipcm-2022-0033","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0033","url":null,"abstract":"Abstract The assessment of the ability of polymeric materials to transmit heat is of interest both from the point of view of ensuring maximum thermal transfer and thermal insulation. A simple equipment was designed and materialized for studying thermal transfer in polylactic acid rods made by 3D printing. The results of some experimental tests carried out using the equipment were mathematically processed, determining empirical mathematical models of the second-degree polygon type and a power-type function. The analysis of the empirical mathematical models and the graphic representations made on their basis revealed a decrease in temperature with the increase of the distance from the heated end of the cylindrical rod type test sample and the increase in temperature along the rod until the state of thermal equilibrium is reached.","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117327572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on the Possibilities of Optimizing the Exploitation of Mechanical Eccentric Presses Based on a Mathematical Model 基于数学模型的机械偏心压力机开发优化可能性研究
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-12-01 DOI: 10.2478/bipcm-2022-0036
Corneliu Burlacu
{"title":"Study on the Possibilities of Optimizing the Exploitation of Mechanical Eccentric Presses Based on a Mathematical Model","authors":"Corneliu Burlacu","doi":"10.2478/bipcm-2022-0036","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0036","url":null,"abstract":"Abstract This paper presents a method for optimizing the exploitation of mechanical eccentric presses based on a mathematical model. This model has been completed with a graphic interface, through which a whole series of constructive and functional parameters can be modified, such as: the radius of the crank, the length of the connecting rod, the mass of the connecting rod, the mass of the pulley, the transfer ratio between the electric motor and the flywheel, the moment of inertia of the flywheel, the parameters of the electric motor, the moment of friction, the force of friction, the initial force of deformation, the final force of deformation, the crank angle corresponding to the beginning of the plastic deformation operation, the thickness of the semi-finished product, the sampling frequency, etc. Also, the graphic interface allows the simulation of two types of operating regimes (single strokes and repeated strokes) as well as two variants of numerical integration (Simpson and Runge-Kutta).","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"41 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133071721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Employng Reworking Areas to Reduce the Cost 采用返工区以降低成本
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-12-01 DOI: 10.2478/bipcm-2022-0039
B. Rădulescu, Mara-Cristina Rădulescu
{"title":"Employng Reworking Areas to Reduce the Cost","authors":"B. Rădulescu, Mara-Cristina Rădulescu","doi":"10.2478/bipcm-2022-0039","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0039","url":null,"abstract":"Abstract The purpose of this paper is to demonstrate the difference between the ways in which technology can be used to reduce manufacturing time, increasing quality and productivity at the same time. All this has results in a saving of energy, labor and resources in general.","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127739719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Study on the Synthesis of 2D Profiles for Cycloidal Discs Used in Cycloidal Reducers 摆线减速器用摆线盘二维轮廓的合成研究
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-12-01 DOI: 10.2478/bipcm-2022-0037
M. Horodinca, Eduard Neculai Bumbu, Adrian D. Munteanu, D. Chitariu, Florin Chifan
{"title":"A Study on the Synthesis of 2D Profiles for Cycloidal Discs Used in Cycloidal Reducers","authors":"M. Horodinca, Eduard Neculai Bumbu, Adrian D. Munteanu, D. Chitariu, Florin Chifan","doi":"10.2478/bipcm-2022-0037","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0037","url":null,"abstract":"Abstract This paper proposes a simple approach on the synthesis of the 2D profiles for the rotors of cycloidal reducers. A 2D rotor (or cycloidal disc) profile (as a complex closed curve) can be defined (as an alternative to the strictly mathematical definition) as the internal bordered envelope of the family of 2D profiles of the stator (or ring gear) obtained with the stator movable (for at least a completely rotation) around the fixed rotor (or planetary gear) by respecting the gearing conditions inside a cycloidal reducer. The more 2D profiles of the stator are used the more accurate definition of 2D rotor profile is obtained. The finding of x, and y-coordinates of the points involved in the description of this 2D rotor profile is by far the most complicated problem to solve in the manufacturing of this type of reducer, the behavior and performances of the cycloidal reducer drastically depends by the accuracy of this profile. The results of this study can be easy applied in practice.","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131338571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Simulating Water Flow Through a Hydraulic Channel Using Ansys 利用Ansys模拟液压通道水流
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-12-01 DOI: 10.2478/bipcm-2022-0034
E. Năstase
{"title":"Simulating Water Flow Through a Hydraulic Channel Using Ansys","authors":"E. Năstase","doi":"10.2478/bipcm-2022-0034","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0034","url":null,"abstract":"Abstract Simulations of water flow in open-channel in the presence of an air–water interface are performed to examine the velocity distribution profile in deep and along of the channel. The simulations are made for a channel with glass walls.","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"65 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116579479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Research on Developing of a Reconfigurable Gripping Mechanism with Electric Drive 电驱动可重构夹持机构的研制
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-12-01 DOI: 10.2478/bipcm-2022-0035
Emilian Păduraru, C. Dumitraș, D. Chitariu, Florin Chifan
{"title":"Research on Developing of a Reconfigurable Gripping Mechanism with Electric Drive","authors":"Emilian Păduraru, C. Dumitraș, D. Chitariu, Florin Chifan","doi":"10.2478/bipcm-2022-0035","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0035","url":null,"abstract":"Abstract The paper consists in analyzing some of the researches on specialized literature regarding to gripping systems and proposing a new solution for a gripping mechanism that can fulfill the increasing requirements imposed by the flexible manufacturing systems regarding the orientation and positioning of parts with variable shape and dimensions. Some general consideration on state of the art in the field of gripping mechanism are presented and main development direction are indicated. The second part of the paper contains in the development of new gripper constructive solution. From the literature analysis the main requirement for a gripping system is the multi-tasking ability. The proposed designed solution uses four parallel open-close jaws/fingers controlled by two electric motors. The actuation of the jaws/fingers for clamping the part is accomplished by a primary motor. The main contribution/improvement refers to the introducing of a second/supplementary motor that is used for the movement of the position of the jaws in order to transform the gripper clamping system from a four-jaw construction to a two-jaw gripper construction and vice versa, thus increasing range of clamped parts.","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121179803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Compared Structural Behavior Study for Basic Lamellar Springs Shapes 基本板层弹簧形状的结构性能比较研究
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-12-01 DOI: 10.2478/bipcm-2022-0032
M. Aignătoaie
{"title":"Compared Structural Behavior Study for Basic Lamellar Springs Shapes","authors":"M. Aignătoaie","doi":"10.2478/bipcm-2022-0032","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0032","url":null,"abstract":"Abstract Springs are common machine elements usually designed by use of analytic calculus adapted to a wide variety of geometrical shapes. Lamellar springs could have rectangular, triangular, trapezoidal and elliptical shapes. The paper presents a comparison of the distribution of some components of deformation and stress for all the mentioned spring shapes. The study was performed by use of FEA within the CAELINUX package. For the rectangular case comparison of Strength of materials vs. FEA results was performed.","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123187921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Simulation of a CNC Machining Program 数控加工程序的仿真
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-12-01 DOI: 10.2478/bipcm-2022-0040
Mara-Cristina Rădulescu, B. Rădulescu
{"title":"Simulation of a CNC Machining Program","authors":"Mara-Cristina Rădulescu, B. Rădulescu","doi":"10.2478/bipcm-2022-0040","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0040","url":null,"abstract":"Abstract This paper presents the influence of the technology on the CNC machine. The evolution of the information and communication technologies, have had a decisive role in all aspects of the life.","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129612317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Study of 2D Profile for a Cycloidal Ring Used in a Cycloidal Reducer 摆线减速器用摆线环二维轮廓的研究
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-12-01 DOI: 10.2478/bipcm-2022-0038
M. Horodinca, Eduard Neculai Bumbu, D. Chitariu, Adrian D. Munteanu, Florin Chifan, George Iulian Frigura
{"title":"A Study of 2D Profile for a Cycloidal Ring Used in a Cycloidal Reducer","authors":"M. Horodinca, Eduard Neculai Bumbu, D. Chitariu, Adrian D. Munteanu, Florin Chifan, George Iulian Frigura","doi":"10.2478/bipcm-2022-0038","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0038","url":null,"abstract":"Abstract This paper intends to introduce a new approach in cycloidal reducers design. The usual design uses rotary pins as teeth on the ring gear (or stator as well) and an appropriate conjugate profile on the cycloidal disc (or rotor as well). This study proposes a new approach: to use rotary cylindrical pins as teeth on the rotor and an appropriate conjugate profile on the ring gear (or cycloidal ring) according with the rules of gearing. The main achievements of this paper focus on the synthesis of 2D internal profile of the cycloidal ring in transverse section. Some theoretical achievements and computer aided simulation results are briefly presented in this paper. This 2D profile is useful mainly for cycloidal reducer computer aided simulation and optimization but also for manufacturing purposes (by contour milling on CNC machines).","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126190665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
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