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Sheet Metal Bending is a common process used in many heavy industry sectors such as shipbuilding. The traditional method is the so-called line heating, which is not only labor intensive but also inefficient and error-prone. This paper presents a new incremental bending method based on minimum energy principle. In this method, the steel blank is supported by an array of hydraulic cylinders with rotary...
This paper proposes a quality detection method of LED surface defects in dispensing back-end based on computer vision library HALCON. The key steps mainly include image preprocessing, image matching and defect detection, etc. Firstly, to choose the matching area automatically according to the regional characteristics of the LED chip. Secondly, image matching with standard template. Finally, complete...
The study of oil droplet spreading behaviors after oblique collision with wall is a foundation work for better understanding the complex two-phase flow in an aero engine bearing chamber. Considering the limitations in the present study, a three dimension symmetrical numerical calculation model using Volume of Fluid(VOF)method and an experimental setup about oil droplet-solid surface oblique collision...
Flood information extraction, includes flooded area and inundated duration, using remote sensing data plays a fundamental role on evaluating loss and conducting disaster rescue and relief. However, the clear-sky image is restricted by different weather conditions such as cloud, rain, fog and so on. Consequently, lack of the critical period remote sensing data of flood routing cannot produce inundated...
Free form surface modeling is one of the most advanced procedures of creating digital models in CAD. Use of free surface for creating solid models has become increasingly relevant in terms of technological possibilities of production in the subsequent phases of the product lifecycle. Multi-axis computer-controlled machines are standard even in small workshops and rapid prototyping is undergoing progressive...
Mesh segmentation or shape decomposition is a crucial step in shape analysis, shape understanding, model retrieval, and shape composition, etc. To yield visually meaningful parts from an object, previous works suggest the concept of the minimal rule and the theory of part salience. However, they mostly rely on an integral of geodesic distance to approximate the part salience, which requires a high...
Ink-jet 3D printing is an additive manufacturing process where-in parts are built by jetting material from nozzles layer by layer, with curing between successive layers of deposition. Typically, this additive process is operated in an open-loop manner, i.e., the number of layers and droplet patterns for each layer are determined in advance and are not modified based on measurements of current height...
Variable-thickness curved components, that have been widely used in many fields, are always caused serious accidents by the surface and subsurface defects, Therefore, how to detect and identify the variable-thickness complex shape components defects is of great significance. For the variable-thickness shape components' surface and sub-surface defects' detecting, it has been testified that surface...
Based on manufacturing technology analysis of bearing rings and on methods and instruments for their dimensional measurement, this paper recommends a post-process measurement system in which a Programmable Logic Controller (PLC) is used to supervise and locally command the measurement process and communicate with a personal computer. Decisions to modify the manufacturing process could be taken based...
In the push for thinner packages for applicationprocessors, baseband processors, and other devices, EmbeddedTrace Substrates (ETS) have found quick adoption in themicroelectronics packaging industry. ETS offer several benefitsover conventional cored substrates, such as dielectric layerthickness reduction, layer count reduction, and lowermanufacturing costs. In parallel, copper pillar interconnectshave...
The treatment of densification by vapor on pristine MWCNT bundles are necessary to improve the effective area of the CNT TSV. However, the CNT bundles might tilt partly because of the non-uniform densification at root of the bundle, especially when it comes to the high aspect ratio CNT bundles. In order to solve these problems, a double densification process has been proposed and developed here. First...
We present a straightforward technique to fabricate helical particles embedded with nanosilver particles aggregation using Spirulina platensis as scaffold, during which the nanosilver particles were controllably synthesized inside the biotemplate by the electroless deposition technique. The TEM of the as-prepared micro particles showed that nanosilver particles were universally distributed inside...
Among the numerous ways to process 3D stacking of integrated circuits, a promising method is the use of Cu/SiO2 hybrid bonding, which enables simultaneous mechanical and electrical connections with an interconnection pitch limited only by photolithography resolution and alignment accuracy. In this work, we present a finite element model of the bonding of Cu/SiO2 patterned surfaces with the aim of...
Surface meshes have recently attracted great interest since they are frequently used in many computer graphics applications. These meshes are often generated by isosurfacing representations or also by scanning devices. Unfortunately, such meshes are dense and they contain many redundant vertices and irregular sampling. This make meshes unable to support multiple applications as storage, display, compression...
This paper proposes an automatic system in order to determine geometric parameters in different cities. That system is based on image processing techniques, and in which different parameters are obtained. The parameters extracted are the perimeter length and the area delimited by that perimeter, and can be used in order to calculate the level of sustainability of metropolitan zones. These tasks have...
The use of Palladium-coated Copper (Pd-Cu) wire helps prevent Copper (Cu) oxidation before and during the bonding process. Different EFO current, firing time and ball size ratio (BSR), affect the roundness of the Free Air Balls (FABs) formed and the distribution of Pd on the surface of the FABs. In this paper, Pd-Cu wires of diameter 0.8 mil were used and 3 settings of Electronic Flame Off (EFO) current...
Progress in the advanced branches of technology has caused the need to manufacture parts of highly complex shapes that are often found through experimenting and only later is described with mathematical models. Most coordinate-measuring machines (CMM) now available have their capability based on implementation of the Cartesian coordinate system. This feature has become a bottleneck on the way to creating...
The low-k dielectric materials in wafer fabrication are widely used. The current advanced mechanical dicing is not able to meet the requirement of low-k technology, since the low-k materials are harder and brittle. Laser dicing is developed for low-k wafer dicing. There are various laser dicing techniques in the market. Depending on the wafer thickness, laser dicing can either be a though cut or a...
The challenge of manufacturing firm today is to maintain competitive advantage in rapid market and customer requirements change environment. Respond to the problems quickly, accurately with breakthrough ideas and make decision from available various alternatives will be crucial. TRIZ-PUGH model which incorporate between TRIZ methodology and Pugh's matrix is created. TRIZ is the systematic methodology...
This paper is devoted to the optimization of image synthesis for complex shape objects in the robotic system of ultrasonic testing. The basis of this process is a preliminary analysis of the object with complex geometry to ensure reproducibility and accuracy of the tests in the specified range. It includes such stages as digital model creation, geometric surface analysis, creating of control points...
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