Papers by Keyword: Dimension

Abstract: A composite material is a combination of two or more materials that have advantages such as light weight, higher strength, corrosion resistance and low installation cost [1]. Composite materials are commonly found in aircraft, automotive, manufacturing and other industries [2,4]. Composite materials based on the type of reinforcement consist of types of fibers, particles and structures [5-14]. In this study, the particle composite material is made from a reinforcing powder made from liquid waste and used for the manufacture of motor vehicle body products (wing or bottom components). Composite reinforcing materials from liquid waste are obtained through the process of drying palm liquid waste or rubber in powder form. The manufacturing process of two-wheeled motor vehicle body products uses a casting process by making molds and products using the hand-laying coating method. The alloying material used in this research is Yukalac 156 BQTN-EC resin and reinforcement from liquid palm oil or rubber waste powder. The variation of the alloy becomes a parameter to evaluate the quality of the casting product analyzed in the form of the geometric characteristics of the product i.e. the dimensions and surface roughness. Variations of composite material alloys use a ratio of 1:1 to 5:1. From the results of the study, it is found that the dimensions are close to the design value with the smallest deviation at a composition ratio of 3:1 which surface roughness values is 2,18 to 3,13 μm for mold dies and 6,45 to 8,02 μm for product.

Abstract: In order to prevent distortion caused by heat which affects the material deformation, the properties controlled are required. The properties changes and the placement of the mounting position will effect the weld strength that causes cracks and broken joints, therefore it affects the safety of machine construction. Thus, the objective of this paper is to control the shape of cross member backbone assembly by gas metal arc welding (GMAW). The welding is produced by an automatic robot Yaskawa-MA1440 type. In order to obtain the good quality of the result, the welding shape is controlled by a parameters combination of voltage, current, and speed. Yaskawa-MA1440 type is used as the automatic welding machine. The main material used is cold rolled steel coil sheet MJSC270D-OD with a thickness of 1.2 mm. In addition, to control the welding shape, the specified shape design standard is followed include travel speed, gas flow, welding direction, torch tip distance to the workpiece, torch angle and welding angle. The results of visual and dimensional were also examined in this research. Furthermore, the macrostructure i.e. leg length, fusion penetration, throat thickness have been analyzed and confirmed based on the standards used in the auto body vehicle part company. The appropriate parameters for the finest welding shape are defined at the horizontal position using an electric current of 120 A and the welding voltage of 18 V (± 1 V). Thus, the measurement control of macrostructure is defined as reference parameters for mass production of cross member backbone assembly.

Abstract: Single Point Incremental Forming (SPIF) technology has become popular and familiar in sheet materials forming, especially in single manufacturing, prototype manufacturing and in the medical field.... However, sheet materials with high hardness and durability are difficult to deform and shape because of their high properties. In that case, when we determine the main logical technological parameters such as forming temperature T (°C), speed of forming V_xy tool (mm/min), depth tool feeding z (mm) and tool diameter D (mm) tool, it is possible to apply HOT SPIF technology at high temperature to form these materials. The paper presents a study of optimization the main technology parameters when processing non-alloy Titanium sheet materials with HOT SPIF technology to get the smallest depth dimension error ΔH.

Abstract: Surface treatment on metal can alter physical and mechanical properties. Understanding the physical and mechanical properties of the archwires is essential for the management of orthodontic treatment. Methods: This study used digital micrometer, universal testing machine, and surface hardness tester for measuring dimension, unloading force, and surface hardness of two different type of nickel-titanium (Ni-Ti) archwires: commercially available Ni-Ti (NT-N) and surface treated Ni-Ti by fine particle shot peening (FPSP) method (NT-F). Statistical analysis was undertaken using a paired T-test (α=0.05). Results: No significant difference was found on both vertical and horizontal dimensions of NT-N and NT-F (p= 1.00 and 0.796 respectively). For bending and surface hardness test, significance difference was found (p<0.001 and p<0.001 respectively). Conclusions: The NT-F archwire provided lower unloading force and surface hardness but there was no change in size when compared with NT-N.

Abstract: Pressure vessel is widely used in the industrial engineering. Many materials in pressure vessel are inflammable and explosive dangerous goods. If the accident happens, great harm will be done to the lives and properties of people. Some common methods for studying pressure vessel have obvious drawbacks. 3D laser scanning method uses non-contact measuring method and can directly obtain the point cloud data of the mass surface which can be used to reconstruct any convex surface. According to the advantages of 3D laser scanning method, in this paper, it is introduced to measure the dimensions of flanges in pressure vessel. The experimental results obtained have little errors, which certify that 3D laser scanning method can be used to measure the dimensions of flanges and further study the characteristics of pressure vessel.

Abstract: Dimensional metrology plays an important role in the modern manufacturing technology. Accurate machining technology remains the main focus of global industry, where needs to permanent study for the purpose of improving. Coordinate metrology is an important inspection tool of dimension and geometrical surface form for machined work-piece to provide functionality in quality process. Several factors affect the accuracy and quality of manufactured parts when machined using circular pocket cycles on CNC machining centers. Such accuracy depends to a great extent on work-piece material, the cutting conditions; namely spindle speed, feed rate, depth of cut and the structure of the fixed cycle. The accuracy of dimensional and geometrical form plays a vital function on the required tolerance and fit of manufactured parts to be assembled.This paper studies the influence of those parameters on the accuracy and quality of milled pocket diameter with its roundness. Several specimens made of aluminum, copper and steel metals were pocket milled on a CNC using different cutting conditions. CMM was used to assess the errors in diameter and roundness measurements of machined parts. In despite of scientific advances in machining technology, however there are still clear deviations in the measurement results according to choice of the cutting condition, especially when change the type of work-piece material. Monitoring suitable validiation method for a typical manufacturing machining is achieved accurately. Moreover, expanded uncertainty in measurement has been estimated using statistical repeatability analysis and most effective experimental parameters.

Abstract: This research aimed to apply the transfer die technology together with the forming simulation by using finite element method to assist the analysis and the design of a high-precision continuous forming die for the panel auto part forming, which was made from 1.4 mm thick steel JFS A3001. The outcome of the finite element simulation of a specimen could be applied in forming a specimen without any specimen damage. Therefore, the high-precision continuous forming die was designed based on the results and factors from the forming simulation. After the design, the high-precision continuous forming die was manufactured and the specimen stamping test was conducted to satisfy the customer’s specifications. The results from the testing shown that the specimens obtained from the forming process are similar to the sample provided from the customer. Only minor forming die modification was required. In addition, the results of specimens inspection according to the inspection location using measuring tools shown that the size and the circumference of the specimens were in an acceptable range with more than 0.05 significance level of P-value (P-Value >α) and 95% statistical confidence level. As a result, die manufacturers can effectively save time, reduce cost and minimize risk occurred from errors in the die manufacturing.

Abstract: Study on solar thermal technology along with its radiation, collection, storage sub-models are full of illuminations in many similar phenomena, so this paper analyzes dimensions in its radiation, collection processes, and founds dimensionless model for these processes, and also figures out their similarity laws, and then extends its radiation, collection theory and technology to fire evolution process, and generalizes fire-protection idea and method: besides directly extinguishing fire by cool water and other constraint agents, we try to collect and transfer fire radiation, as the result, indirectly extinguish fire. This generalization is expected to many brand-new extinguishing fire technologies in the future.

Abstract: In this paper it is presented an analysis regarding the influence of temperature from the chipping area, in the machining by centerless grinding with transversal feed. The temperature influences the machining precision, the additional loads of the machine – device – tool – part elastic system and the measurement accuracy. These influences have direct impact on the precision and quality of the machined parts executed using the centerless grinding process.

Abstract: s.The technology and principle involved in the on-line analytical processing is presented in theory, such as an overview of the on-line analytical technology, the operation of the on-line analytical technology, etc, which sets a technological foundation to build a system to realize online analysis.