the prime minister and i episode 1 eng sub full

Metal Machining - Theory and Applications Episode 1 Part 10 ppt

Ngày tải lên : 21/07/2014, 17:20

... view of chip formation Z′ is parallel to z and z′, still in the cutting direction, but X′ is normal to, and Y′ is in, the plane containing the cutting and chip velocities In terms of the chip ... indicate the positions 1, 2, 3, etc in Figure 6 .15 at which the quantities are calculated, or else the subscripted quantities are defined in the figure Further details of the values of the quantities ... value of the uncut chip thickness is t1e and the accompanying chip thickness is t2e The subscript e stands for effective and emphasizes that the plane of the figure is the Uwork–Uchip plane The rake...

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Metal Machining - Theory and Applications Episode 1 Part 9 pptx

Ngày tải lên : 21/07/2014, 17:20

... known (p1 = +k in this case) and if the directions of the slip-lines f1, f2 and f3 at points 1, and are known (point is the intersection of the a and b lines connecting points and 3) Then, the normal ... Annals CIRP 26 (1) , 21 26 Kakino, K (19 84) Monitoring of metal cutting and grinding processes by acoustic emission J Acoustic Emission 3, 10 8 11 6 Miwa, Y., Inasaki, I and Yonetsu, S (19 81) In-process ... slip-line is determined by force equilibrium requirements If the directions of the slip-lines at a point are defined by the anticlockwise rotation f of one of the lines from some fixed direction...

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Metal Machining - Theory and Applications Episode 1 Part 8 ppsx

Ngày tải lên : 21/07/2014, 17:20

... thermocouple calibration set-up Childs Part 28:3:2000 3 :11 pm Page 15 1 Temperatures in machining 15 1 Fig 5 .17 A detail of the hot junction and the associated measurement circuit Fig 5 .18 Calibration ... ring (Figure 5.9) is loaded radially there is zero strain at the positions B and B′, ± 39.9˚ from the point of application of the radial load; likewise when the ring is loaded tangentially, there ... from the cutting edges, and the work and its holder have higher inertia than the tool and its holder in turning The quick-stop must be synchronized with the intermittent cutting action There...

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Metal Machining - Theory and Applications Episode 1 Part 7 ppt

Ngày tải lên : 21/07/2014, 17:20

... alumina ceramic tools when machining steel Carbon, silicon and nitrogen all diffuse easily in iron at elevated temperatures; and silicon nitride and silicon carbide dissolve readily in hot iron Thermal ... changes in sliding conditions In machining, the tool damage mode and the rate of damage are similarly very sensitive to changes in the cutting operation and the cutting conditions While tool ... coated with PVD TiN, TiCN or TiAlN Chromium nitride, boron nitride and boron carbide coatings are also under investigation TiN and TiC coatings have also been found to be useful on silicon nitride...

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Metal Machining - Theory and Applications Episode 1 Part 6 pdf

Ngày tải lên : 21/07/2014, 17:20

... it will lose the toughening reinforcement that it gains from its substrate The tensile thermal strain resulting from its thermal mismatch with the substrate will further contribute to its failure ... conductivity was emphazied as influencing the steady state temperature rise in machining In transient conditions, heat capacity is also important because, with conductivity, it determines thermal diffusivity ... cubic boron nitride (single crystal diamonds are also used for the finishing of IT mirror and disc substrate products) Details of the various materials within these groups are given in Appendix...

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Metal Machining - Theory and Applications Episode 1 Part 5 potx

Ngày tải lên : 21/07/2014, 17:20

... stresses (which are between two and three times the average stress) in the range k to 3k This is in line with the estimates in Chapter 2, Figure 2 .15 The different thermal diffusivities of the five metals ... spanning the range as far as tool stressing is concerned Their intermediate thermal conductivities and diffusivities result in their spanning the range with respect to temperature rise per unit ... temperature rises in machining At the other extreme, austenitic steels, nickel and titanium alloys have medium to high shear stresses and work hardening rates and low thermal diffusivities They are likely...

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Metal Machining - Theory and Applications Episode 1 Part 4 pot

Ngày tải lên : 21/07/2014, 17:20

... caused by the heating Given that the primary shear acts on the workpiece, these simple considerations point to the possibility of workpiece thermal damage when machining aluminium and titanium alloys, ... Chapter 1) Small variations in mechanical characteristics can lead to large variations in economic life It is the economic pressure to use cutting edges at their limit that drives the study of machining ... heating of the chip and tool due to friction is considered next 2.3.2 Heating due to friction The size of the friction stress t between the chip and the tool has been discussed in Section 2.2.5 It...

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Metal Machining - Theory and Applications Episode 1 Part 3 pot

Ngày tải lên : 21/07/2014, 17:20

... chip still, but its friction coefficient is marginally increased too Comparing Figures 2.8(b) and 2.7(b), changes in work hardening and friction coefficient have similar influences on chip thickness ... create them The role of mechanics in this context is more to aid the description than to be predictive First, Section 2.2 .1 describes how chip formation in all machining processes (turning, milling, ... formed is thick and straight Adding a lubricating fluid causes the chip to become thinner and curled In this case, adding the lubricant caused the friction coefficient between the chip and tool...

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Metal Machining - Theory and Applications Episode 1 Part 2 pps

Ngày tải lên : 21/07/2014, 17:20

... Ct is the initial price of the tool, plus all the reconditioning costs, divided by the number of times it is reconditioned It is less than the purchase price (if it were more, reconditioning would ... Table 1. 1 (cutting tool data) and equations (1. 10) and (1. 11) for cost rates Childs Part 28:3:2000 2:35 pm Page 31 Economic optimization of machining 31 Table 1. 7 Assumptions for milling time and ... is continuously removing metal Equations (1. 12) and (1. 13) can be used with a = For the example concerned, the time and cost of removing material by drilling is negligible It is the loading and...

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Metal Machining - Theory and Applications Episode 1 Part 1 potx

Ngày tải lên : 21/07/2014, 17:20

... loading and unloading systems (see Section 1. 2) The prices in Figure 1. 10(b) not include such external materials handling devices 1. 1.2 Milling and drilling machines Up to this point, the description ... retrieval system, without either prior permission in writing from the publishers or a licence permitting restricted copying In the United Kingdom such licences are issued by the Copyright Licensing ... non-productive cycle time, relative to its pre -19 70 levels This halving of time is indicated in Figure 1. 5(a) (Figure 1. 5(b) is considered in Section 1. 1.2) A further halving of non-productive cycle time...

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