scholarly journals Recycling-Cum-Manufacturing Process for Utilization of Finely Divided Ferrous Metallic Scrap

2018 ◽  
Author(s):  
Kedarnath Rane ◽  
Prashant Date
Keyword(s):  
Manufacturing Process ◽  
Raw Material ◽  
Metal Injection Molding ◽  
Shop Floor ◽  
Sintering Behavior ◽  
Process Variables ◽  
Manufacturing Plants ◽  
Secondary Steelmaking ◽  
Volume Kinetics

The issues of metallic scrap management and its utilization in manufacturing plants are nowadays intensely considered to address essential sustainability guidelines. Efficient recycling procedure for shop floor metallic scrap is not yet available because of abundance and contamination of nonmetallic constituents. Other ferrous metallic scrap are melted and purified during secondary steelmaking to get products in the form of blooms and billets are obtained. This study illustrates the potential of powder technology (powder metallurgy (PM) and metal injection molding (MIM)) based process for solid-state recycling and attainment of usable products. Industrially downgraded grinding sludge is pulverized and used as a raw material. Results showed properties of sintered parts are significantly improved due to in-situ reduction and densification during sintering. Recyclability Index (RI) was created to compare the effect of process variables on obtained products. Based on RI, recycled ferrous parts have about 70% comparable properties with equivalent pure iron parts. Complex reduction and sintering behavior in MIM, particularly, diffusion and pore volume kinetics limits applicability of MIM with this recycling approach. However, few industrial parts were developed and manufactured by PM based approach to validate the applicability of this novel recycling-cum-manufacturing process for the production of porous parts.

scholarly journals Recycling Potential for Finely Divided Ferrous Metallic Scrap Using Powder Technology

Recycling ◽  
2018 ◽  
Vol 3 (4) ◽  
pp. 59
Author(s):  
Kedarnath Rane ◽  
Prashant P. Date
Keyword(s):  
Solid State ◽  
Energy Requirement ◽  
Quantitative Measure ◽  
Raw Material ◽  
Powder Technology ◽  
Metal Injection Molding ◽  
Recycling Potential ◽  
Kinetics Of ◽  
State Processing

Enormous amount of scrap is generated on the shopfloor during manufacturing. Energy needed to melt increasing quantities of scrap will be ever increasing, and so will be the loss of metal during melting. Hence, conversion of scrap directly into marketable products by solid state processing methods is economical due to a lower energy requirement and a greater yield compared to the melting route. This makes the process more environmentally friendly. However, not all materials can be recycled in a solid state, with equal ease. One therefore needs to quantitatively assess the recyclability of a given kind of scrap. In the present work, a procedure to assess the recyclability of finely divided ferrous metallic scrap generated on the shopfloor is demonstrated. Recyclability includes material and the process used for recycling. For instance, a given material might be more recyclable using one process compared to the other. In the present study, the potential of powder technology (powder metallurgy (PM) and metal injection molding (MIM) based processes are compared for solid-state conversion of scrap directly into usable products. Grinding sludge collected in the shopfloor was pulverized and used as raw material. Properties of sintered parts were found to be significantly better due to in-situ reduction and densification during sintering. A quantitative measure of recyclability, namely, the Recyclability Index (RI) was defined to compare the manufacturability of different products. Recycled ferrous parts manufactured by PM route are found to have a greater RI (superior recyclability) than those manufactured by the MIM route. Complex reduction and sintering mechanisms in MIM parts, particularly, the kinetics of diffusion and volumetric shrinkage, limit suitability of MIM for recycling. In contrast, few industrial parts were developed and manufactured by conventional PM based approach to demonstrate the suitability of this novel recycling process especially for manufacture of porous parts.

scholarly journals Sparking Manufacturing Innovation: How Temporary Interplant Assignments Increase Employee Idea Values

2020 ◽  
Author(s):  
Philipp B. Cornelius ◽  
Bilal Gokpinar ◽  
Fabian J. Sting
Keyword(s):  
Operations Management ◽  
Learning By Doing ◽  
Shop Floor ◽  
Manufacturing Plants ◽  
Level Data ◽  
Manufacturing Innovation ◽  
Econometric Tests ◽  
Production Knowledge ◽  
Productivity Gains

Shop-floor employees play a key role in manufacturing innovation. In some companies, up to 75% of all productivity gains are the result of bottom-up employee ideas. In this paper, we examine how employee interplant assignments—short problem-solving jobs at other manufacturing plants within the same firm—influence employee-driven manufacturing innovation. Using unique idea-level data from a large European car parts manufacturer, we show that interplant assignments significantly increase the value of employees’ improvement ideas due to the short-term transfer of production knowledge and long-term employee learning. Both effects are amplified by assignments to plants that have high functional overlap (i.e., plants producing similar products using similar processes and machinery). One implication is that, for the purpose of employee-driven manufacturing innovation, assignments between peripheral plants with high functional overlap can be more effective than assignments to and from central plants. These findings are robust to several econometric tests. Our study provides novel and detailed empirical evidence of manufacturing innovation, and goes beyond previous research on the learning curve (learning by doing) by investigating how interplant assignments affect the value of employees’ improvement ideas (learning by moving). This paper was accepted by Charles J. Corbett, operations management.

Fabrication of Nanoscale Homogeneous Lead Azide@Carbon Fiber Film with Low Electrostatic Sensitivity by In-situ Synthesis

2021 ◽  
Author(s):  
Zhenzhan Yan ◽  
Li Yang ◽  
Ji-Min Han ◽  
Haojie Li ◽  
Junda Huo
Keyword(s):  
Carbon Fiber ◽  
Lead Acetate ◽  
In Situ Synthesis ◽  
Raw Material ◽  
Lead Azide ◽  
Nano Scale ◽  
Carbon Based

In this work, a nano-scale carbon-based lead azide initiating film was prepared by electrospinning, carbonization, azide, and other steps using cheap and easily available lead acetate as the raw material....

In situ monitoring the manufacturing process of polymer composites with highly flexible and sensitive GNP/ MWCNT film sensors

2019 ◽  
Vol 285 ◽  
pp. 127-133 ◽  
Author(s):  
Shaowei Lu ◽  
Chenxu Zhao ◽  
Lu Zhang ◽  
Keming Ma ◽  
Yaoyao Bai ◽  
...  
Keyword(s):  
Polymer Composites ◽  
Manufacturing Process ◽  
In Situ Monitoring
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