Question

In the example show substrate is TC, followed by Alo, and first laver should bond well to the substrate, the and have low thermal conductivity, and c) the well and be compatible with both layersiate a coatings and an ver are listed as Sullo Typcal applications of multiple coated tools High speed, continuous cutting TiC/ALO b. Heavy-duty, continuouscurring: TC/Al,o /TiN. TiC + TiN/TiN. cutting: TiC/ Light, interrupted development in coatings is alternating mult A more recent layers that are thinner than in typial multphase coatings Fie ness of thesc layers is inthe range of 2-10㎛. The reason for ings is that coating hardness increases with desreasing grain si, TN TN No, TN Carbide sb FIGURE 8.37 Multiphase coatings on a tungsten carbide layers of aluminum oxide are separated by very thin layers of sitan as many as 13 layers of coatings have been made Coating thickness re range of 2 to 10 μη. Source: Courtesy of Kennametal, Inc. substrate. The Ti or Al alloy low-pressure compressor Ni alloy Ni alloy high-pressure low-pressure Ti alloy farn turbine turbine Ni alloy Ti or Ni alloy high-pressure compressor combustion chamber Turbine exhaust case Turbine blades Ni alloy Ni alloy Accessory section Al alloy or Fe alloy inlet case Al alloy A round rod of annealed brass 70-30 is being drawn from a diameter of 6 mm to 3 mm at a speed of 0.6 m/s. Assume that the frictional and redundant work togeth- er constitute 35% of the ideal work of deformation. (a) Calculate the power required in this operation, and (b) calculate the die pressure at the exit of the die n is the Invisalign product, made by Align Technologies. It con- of aligners, each of which is worn by the person for approxi eks. Each aligner (see Fig. 10.58) consists of a precise geometry sists of a series mately two which incrementa inserts that can re tally moves the teeth to their desired positions. Because they are e removed for eating, brushing, and flossing, most of the draw- onal braces are eliminated. Furthermore, since they are ks of conventional duced from a transparent plastic, they do not seriously affect the person's hac The Invisalign product uses a combination of advanced technologies in a oduction process shown in Fig. 10.59. The treatment begins with an orthodon it making a polymer impression of the patient's teeth (Fig. 10.59a). These im ions are used to create a three-dimensional CAD representation of the teeth s shown in Fig. 10.59b. Proprietary computer-aided design software then assists n the development of a treatment strategy for moving the teeth in an optimal appearance. manner. Once a treatment plan has been developed, the computer-based information s used to produce the aligners. This is done through a novel application of stere- olthography. Although a number of materials are available for stereolithography hey have a characteristic yellow-brown shade to them, and are therefore unsuit e for direct application as an orthodontic product. Instead, the stereolithogra machine produces patterns of the desired incremental positions of the teeth heet of clear polymer is then thermoformed (see Section 10.10.5) ese patterns to produce the aligners. These s.and new aligners are given to the patient as needed, usually about e er th are sent to the treating ortho- two weeks gn product has proven to be very popular with patients who wish al health and to preserve their teeth long into their lives. The use ensively atoraphy to produce accurate thermoforming molds quickly and inex The Invisal to promote denta of stereolithograp ography to produce accurate allows this orthodontic treatment to be economically viable. Courtesy Align Technologies, Inc

Answer 1

Sfeed -06 mis Frve strain thet atevial undexpes in -this cerrtion i S 60.6431 8 께 die pressure Can be oblained froYo (871 -693 Tre diefressue at the Eit is