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An Overview of Forging Processes with Their Defects

An Overview of Forging Processes with Their Defects

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compared to other manufacturing processes, there are some defects that are lightly to come if a proper care is not taken in forging process design. Defects can be defined as the imperfections that exceed certain limits. There are many imperfections that can be considered as being defects, ranging from those traceable to the starting materials to those caused by one of the forging processes or ...

Common Parts Defects, Causes and Solutions in CNC Milling ...

Common Parts Defects, Causes and Solutions in CNC Milling ...

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 · Defect. In the CNC milling process, the milling machine leaves the remaining material on the workpiece. This residual material is called burr. They are usually formed along the bottom edge of the workpiece during milling or drilling. In addition, it is also common in softer materials with low hardness and strong plasticity. Cause. The last layer of material is often deformed and removed from ...

DEFECTS IN GLASS

DEFECTS IN GLASS

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the grinding and polishing process, consisting of fine pits and cracks that are denoted as finish ; when this condition is visible, it is called short finish. Slight surface defects that originate in the process ; these can be small particles of foreign materials on either surface or slight defects in the bottom (float) surface. REAM / (see Cords) Inclusions within the glass, or layers or ...

Wafer backgrinding

Wafer backgrinding

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Wafer backgrinding is a semiconductor device fabriion step during which wafer thickness is reduced to allow stacking and highdensity packaging of integrated circuits (IC).. ICs are produced on semiconductor wafers that undergo a multitude of processing steps. The silicon wafers predominantly used today have diameters of 200 and 300 mm. They are roughly 750 μm thick to ensure a minimum .

DEFECTS IN EXTRUSION PROCESS AND THEIR IMPACT ON .

DEFECTS IN EXTRUSION PROCESS AND THEIR IMPACT ON .

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various defects in the extrusion process, to identify its impact on the product quality and to suggest the remedies for the improvement of extrusion process. Keywords: Extrusion process, Defects in plastic pipe, Impact of defect, Product quality INTRODUCTION Manufacturing of polyvinyl chloride (PVC) in India started 60 years ago with the country's first PVC plant set up in Mumbai in 1951 ...

Manufacturing and characterisation of artificial defects ...

Manufacturing and characterisation of artificial defects ...

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expected as well, as the factors during the grinding process, the materials to be worked, ... artificial defects for grinding burn detection. 2. Artificial defects Artificial defects must able to be reproducibly fabried defined per size, loion and intensity. Furthermore, they shall have a similar physical behaviour like real defects. It is, however, not possible, and it would certainly ...

Welding Defects : Types, Causes, Testing and Remedies ...

Welding Defects : Types, Causes, Testing and Remedies ...

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 · Defects are common phenomenon in any manufacturing process. This is due to some process limitation and some human behavior. It is impossible to form a defect free welding joint but it can be reduce to some extent by taking some precautions. Today we will learn about all types of welding defects. Types of Welding Defects: After welding some defects are found which make the strength .

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– Welding Defects and their Remedies. Module 3 – Forming Processes Sheet Metal Working Processes 10 Topics – Introduction and Classifiion of Metalworking Processes. – Hot and Cold Working Processes . – Forging Operations. – Rolling Operations. – Defects in Rolled and Forged Components. – Extrusion Process. – Wire Drawing ...

Defect Reduction in Fabried Components using RootCause ...

Defect Reduction in Fabried Components using RootCause ...

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processes like grinding, milling and turning. While doing this, problems like restricted movements of one component relative to other, wear of components, failure of component in service etc. arise. So to avoid this, RootCause Analysis of these defects is carried out and production process is modified as per the results of analysis. Analyzing failures is a critical process in determining the ...

Removal behavior and performance analysis of defective ...

Removal behavior and performance analysis of defective ...

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Grinding process of 135°defect (in actual grinding area, defect depth:6 Å). In the above analysis, all defects loed in the grinding area are filled with atoms and defects is removed, though the surface damage layer in the defect area is slightly thicker than the surface damage layer in the nondefect area. The transverse defects (defect depth:16 Å) are partially loed in the elastic ...

Thinning Process Induced Surface Defects in UltraThin Si ...

Thinning Process Induced Surface Defects in UltraThin Si ...

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Thinning Process Induced Surface Defects in UltraThin Si Wafer ... back grinding process is left behind even after the stress relief process. However, for thickness, such defects the similar were not observed in the Si wafer stress relieved by CMP and PE. It can also beclearly seen that the existence of stress field pattern (as bend contours) in the TEM imagesis observed, which is solely ...

Appliion of six sigma methodology to reduce defects of ...

Appliion of six sigma methodology to reduce defects of ...

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This paper explores how a manufacturing process can use a systematic methodology to move towards worldclass quality level. The appliion of the Six Sigma methodology resulted in reduction of defects in the fine grinding process from to %. The DMAIC methodology has had a significant financial impact on the profitability of the company in terms of reduction in scrap cost, manhour ...

How to reduce mould processing defects

How to reduce mould processing defects

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The following seven measures can build mould processing defects. 1. Reasonable selection and dressing of the grinding wheel. The white corundum grinding wheel is better. Its performance is hard and brittle, and it is easy to produce new cutting edges. Therefore, the cutting force is small, the grinding heat is small, and the medium grain size is used, such as 46~60 mesh is better. In the ...

Mechanisms of subsurface damage and material removal ...

Mechanisms of subsurface damage and material removal ...

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A good surface integrity of the Ni/Cu multilayers, with relatively fewer lattice defects, is more easily obtained by a machining process with a smaller tool radius or cutting depth. The results also show that the grinding temperature of Ni/Cu multilayers with varying grinding speeds, tool radii and cutting depths is higher than that of pure Ni thin film. 1. Introduction Nanoscale machining ...

Common problems and solutions of grinding wheel in the ...

Common problems and solutions of grinding wheel in the ...

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 · Grinding is a complex system engineering, and the grinding wheel and grinding process should be correctly selected according to the material characteristics of the workpiece. When there are different grinding defects in the working conditions, the correct dressing method should be adopted, so that the workpieces with good machining quality and high dimensional accuracy can be obtained, so .

Ways to reduce processing defects in plastic molds ...

Ways to reduce processing defects in plastic molds ...

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 · After the plastic mold is processed, it will also reflect the processing defects, resulting in the decline of mold performance. How to reduce mold processing defects? Reasonable selection and dressing of the grinding wheel. The white corundum grinding wheel is better, the performance is hard and brittle, and it is easy to produce new cutting edges.

Putting the

Putting the "Feed" in ZeroDefect ThroughFeed Grinding ...

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 · Frustrated by quality problems with outside grinding services for a highvolume engine component, the automotive parts supplier had decided to bring the job in house. In addition to being fully automated, the process had to churn out a minimum of two parts per second with zero defects.

Typical Heat Treatment Defects of ...

Typical Heat Treatment Defects of ...

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 · In this paper, the commercial heat treatment software DANTE is used to investigate three examples of heat treatment defects. Improved processes are suggested with the help of modeling. The first example is an oil quench process for a large gear. Peeling cracks were observed on the gear surface during grinding of the quenchhardened gears. Computer modeling showed that surface .

Manufacturing Processes – II

Manufacturing Processes – II

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Abrasive Processes (Grinding) Version 2 ME, IIT Kharagpur . Lesson 29 Classifiion of grinding machines and their uses Version 2 ME, IIT Kharagpur . Instructional Objectives At the end of this lesson the students would be able to: (i) recognise various types of basic grinding machines (ii) illustrate techniques of grinding in these machines (iii) state various appliions of grinding ...