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Roll Pass Design
Published in N.K. Gupta, Steel Rolling, 2021
To determine roll gap, following factors are to be considered: Type of pass i.e., whether, it is used at finishing, pre-finishing or at roughing group of stands.Type of products to be rolled from particular pass. Higher value is choosen for semi-finished products.Minimum and maximum size of products are require to be rolled from that particular pass or rolled from the same pass.Tolerances for roll turning.The roll turning tolerances will be taken from lesser value, if roll is turned in a CNC lathe, than in conventional lathes.Mill Spring (Explained earlier).
POLCA–The New Material Control and Replenishment System for QRM
Published in Rajan Suri, John Burke, Quick Response Manufacturing, 2020
Figure 9-1 shows a typical push system, driven by MRP. The production plan is driven by the due date for a shipment. This date triggers the MRP calculations, which use the planned lead times to determine when material is to be released to the first work center. After release, the material is pushed through this and all the subsequent work centers. Why is this called “push”? Because each work center is supposed to complete work according to the schedule the MRP system gives it. Suppose, in a traditional functional organization, a job needs to be turned and then milled. Let’s say the milling department is backed up with a lot of work because one of its milling machines failed unexpectedly last week. But if the schedule at the lathe department dictates that this job should be turned today, then the lathe department will attempt to meet that schedule. After being completed, the job will be “pushed” to the milling department, where it will sit for several days.
Engineering materials and heat treatment
Published in Roger Timings, Engineering Fundamentals, 2007
Giving reasons for your choice, name a suitable plain carbon steel and state its heat treatment condition for each of the following applications. Cold chisel.Engineer's file.Vehicle leaf spring.Sheet steel for pressing out car body panels.Rod for making small turned parts on an automatic lathe.
Advanced Autonomous Welding for Refabrication and Follow-On Testing of Previously Irradiated Nuclear Fuel
Published in Nuclear Technology, 2023
Justin D. Yarrington, Jason L. Schulthess, Spencer H. Parker, Jordan M. Argyle, Clayton G. Turner, John D. Stanek, Cad L. Christensen
The REWS was used to perform in-cell circumferential welds on fuel cladding and press-fit endcaps, as seen in Fig. 8. The rodlet was first loaded into a heat sink connected to a lathe chuck, and the distance between the cladding-endcap interface and the front face of the heat sink Li was set to 5.59 mm using a depth gage. The cladding-endcap interface was cleaned again with a 99.5% ethanol alcohol solution and a HALO gas supply was positioned over the rodlet. The welding nozzle was positioned so the tungsten tip was 0.762 mm above the interface, as shown in Fig. 9 and Fig. 10. The lathe chuck was then activated and turned at a speed of 10.3 rpm ( for a 9.50-mm-diameter rodlet). A minimum of four full rotations were completed without activating the torch while supplying welding gas to achieve a steady, inert condition prior to welding. The weld sequence was then activated, and the circumferential weld was completed. The welding nozzle and HALO gas supply were then retracted, the rodlet was removed, and the process was repeated for the opposing side.
Ambulance disinfection using Ultraviolet Germicidal Irradiation (UVGI): Effects of fixture location and surface reflectivity
Published in Journal of Occupational and Environmental Hygiene, 2018
William G. Lindsley, Tia L. McClelland, Dylan T. Neu, Stephen B. Martin, Kenneth R. Mead, Robert E. Thewlis, John D. Noti
To perform irradiance measurements, the sensors were placed at 17 locations. The UVGI light fixture was turned on and allowed to stabilize for 30 min. Separate irradiance measurements were collected with the fixture in the back, middle and front positions. The fixture was then turned off and 16 of the sensors were moved to different locations; one sensor was left in the same location (B2) for all tests to allow comparison of irradiance levels from different tests. The measurements were collected using the three light fixture positions. The fixture was turned off, 16 sensors were moved to the final set of locations and the measurements were repeated. The entire set of measurements was repeated three times with the sensors rotated among the locations, so that measurements were collected three times with different sensors at each location for each UVGI fixture position (153 data points).
Use of Atomized Spray Cutting Fluid Technique for the Turning of a Nickel Base Superalloy
Published in Materials and Manufacturing Processes, 2021
Vinothkumar Sivalingam, Zan Zhuoliang, Sun Jie, S. Baskaran, N. Yuvaraj, Munish Kumar Gupta, Mashood Khan Aqib
In the end, the turned surface is evaluated, and the wire cut electrical discharge machining process is used to cut the workpiece after the turning experiments. Using ethanol at 70°C for 30 minutes to clean the specimen using an ultrasonic cleaner, as shown in Fig. 5. Investigations of surface damage were performed as the machining parameters (vc, f, and ap) varied, are shown in Fig. 6. An evaluation of the impact of the different machining parameters showed many defects in dry and atomized spray cutting fluid conditions. These defects include burnt surface, feed marks, scratches, plastic deformation, workpiece and tool debris. The surface defects of dry and atomized spray cutting fluid conditions at varying vc, f, and ap, are depicted in Fig. 6. Surprisingly, the dry machining produces the higher feed marks and burnt surface compared to the atomized spray cutting fluid machining. The reason might be the presence of micro solid lubricant with water-based soluble oil enhance the heat absorption. This concept is usually associated with the theory that the buildup edge forms under dry machining conditions.[17] It is well known that Inconel 718 is not thermally well conductive and has a high chemical reaction with tool material at higher rpm. This high cutting speed increases the plastic deformation between the tool-workpiece interface, making the part very viscous. However, fine spray droplets minimize the friction force along the workpiece surface and the tip of the tool, hence preserve the tooltip sharpness at an elevated temperature, as shown in Fig. 6.