vt liu dng c ct cutting tool materials

... reactor via a hydrogen carrier gas (H2), whereas CH4 is introduced directly This volatile cloud reacts on the hot tooling surfaces and the chemical reaction in say, forming a TiC as a surface coating, ... introduction showing how and in what manner correct tooling can be used to increase production output, needs to be considered against the current situation of advances in cutting tool materials ... process (Fig shows a schematic view of the CVD process) at temperatures in the range 950 to 1050 C Essentially, the coating technique consists of a commercial CVD reactor (Fig 8a) with cutting tools,...

Ngày tải lên: 27/06/2014, 14:20

... edge Cutting tool manufacturers, by careful balancing of these five factors for the ideal cutting tool, can produce grades of inserts which distinctly vary, allowing a wide range of workpiece materials ... as necessary Cutting Tool Materials Figure 6.  Classification of carbides according to use [Courtesy of Seco Tools] 13 14 Chapter 1.2.5 Tool Coatings: Chemical Vapour Deposition (CVD) Rather ... Essentially, the coating technique consists of a commercial CVD reactor (Fig 8a) with cutting tools, or inserts to be hard-coated placed on trays (depicted in Fig 8b) Prior to coating the tooling situated...

Ngày tải lên: 27/06/2014, 23:20

... edge Cutting tool manufacturers, by careful balancing of these five factors for the ideal cutting tool, can produce grades of inserts which distinctly vary, allowing a wide range of workpiece materials ... CNC controller of the machine tool, to either change after a certain number of parts has been produced, or if the tool life has been calculated, then when the feed function on the CNC has decremented ...  Chapter 1.1 Cutting Technology – an Introduction Previously, many of the unenlightened manufacturing companies, having purchased an expensive and sophisticated new machine tool, considered cutting...

Ngày tải lên: 05/08/2014, 20:22

... as necessary Cutting Tool Materials Figure 6.  Classification of carbides according to use [Courtesy of Seco Tools] 13 14 Chapter 1.2.5 Tool Coatings: Chemical Vapour Deposition (CVD) Rather ... Essentially, the coating technique consists of a commercial CVD reactor (Fig 8a) with cutting tools, or inserts to be hard-coated placed on trays (depicted in Fig 8b) Prior to coating the tooling situated ... hours for coating and hours for cooling The thickness of the CVD coating is a function of the reaction concentration, this being the subject of: various gaseous constituents and their respective...

Ngày tải lên: 05/08/2014, 20:22

... mounted in their respective tool holders in exactly the correct orientation/plane, so avoiding any potential cleavage in-cut SCD tool cost is a draw-back, because these tools cost in the region ... Materials 25 Table 1.  Cutting tool materials – with some important physical properties Black ceramic (Al2O3 + TiC) Cemented carbide (ISO K10 grade) CBN (DBC50) CBN (DBC80) Density [g cm–3] 4.28 14.7 ... equivalent PCD tool However, despite this very high cost difference, SCD can reduce the overall operating costs and significantly improve productivity, when applied to the correct machining process...

Ngày tải lên: 05/08/2014, 20:22

Ngày tải lên: 05/08/2014, 20:22

... thu c vào c ng c vật liệu phôi, đ c điểm hình h c công c , thông số quy trình, chất lỏng c t, đ c tính máy c ng c Mòn dụng c c t thay đổi hình h c dụng c trình c t theo nhiều c ch kh c nhau, ... X c định l c tham gia vào trình c t? Những l c góp phần tạo nên c ng suất yêu c u thiết bị? Những l c cắt tham gia vào trình c t: - L c cắt Fc L c ma sát F Phản l c Fn L c đẩy Ft Phản l c N L c ... Điềm kh c biệt vi c cắt thẳng g c cắt xiên  C t thẳng g c: Khi điều kiện c t dự kiến phoi c t chạy d c theo mặt phẳng vuông g c với bề mặt c t Trên nguyên t c g c tạo phoi mặt phẳng c t g c 90...

Ngày tải lên: 09/01/2016, 16:50

Ngày tải lên: 23/07/2013, 01:26

... been incorporated 2.1.6 Cutting Toolholder/Insert Selection When deciding upon the correct selection of a toolholder /cutting insert for a given application, a range of diverse factors must be considered, ... VII Tool programme – the correct/specified tool and its tool offsets, etc., VIII Performance – cutting data, anticipated tool- life and economics, IX Quality – tool delivery system and service ... as: machine tool s condition, its power, the stability of the workpiece -tool- machine set-up, other factors that could affect geometry selection include: whether continuous, or intermittent cutting...

Ngày tải lên: 21/06/2014, 21:20

... mentioned in Section 2.1.6, concerning: Cutting Tool holder/Insert Selection Moreover, the top rake geometry of the cutting insert will significantly affect the chip formation process, particularly ... experimental cutting procedure, that the tangential cutting force component, was closer to the actual cutting edge than when similar machining was undertaken on unalloyed steel specimens NB  The cutting ... the machined profile would be compromised and due to insufficient chip control, the actual cut surface profile would not have a consistent and accurate surface texture The machined surface texture...

Ngày tải lên: 21/06/2014, 21:20

... control, which in turn, causes the tool to deflect This parting-off tool deflection, can lead to the component’s face ‘dishing’ , creating a convex surface on one face and a concave surface on the ... indicative of long ribbon-like chips producing unmanageable swarf If the chip curve is tight helix, coupled to a thick chip cross-section, this means that the length of the chip /tool contact has ... CAD techniques coupled to FEA to construct the insert’s cutting edge, commashaped chips are the likely product of any machining, providing that the appropriate cutting data has been selected In...

Ngày tải lên: 21/06/2014, 21:20

... as below: Chip flow (cos η) = cos I (bc/b) Where: I = inclination of cutting edge, bc = chip flow vector, b = direction of cutting vector Drilling and Associated Technologies The conventional ... distinct cutting regions can be established: firstly, the main cutting edge, or lips; secondly at the intersection of the clearance and main cutting edge – termed the chisel edge In fact for ... The main cutting edges are accountable for a relatively conventional chip formation, as shown in the ‘quick-stop’ photomicrograph in Fig 44b An oblique cutting action occurs to the direction of...

Ngày tải lên: 21/06/2014, 21:20

... workpiece’s surface at the correct height By the correct production application of both Special-purpose and Multi-spindle drilling tooling, then 27 Short cycle times, are considered to be the quickest ... production run, • Tooling accuracy is reflected in the part’s manufacture – if for example the precision part must have all its component features in accurate alignment, or in a specific relationship ... Deep-hole drilling technique, as one of its main functions is – apart from lubricating/cooling the cutting edge and chip flushing – is to restrict frictional effects between the: drill, chip and hole...

Ngày tải lên: 21/06/2014, 21:20

... greater general cross-sectional rigidity, to other boring bar geometric cross-sections Once the bar cross-section has been selected, the next decision to be taken concerns the tool s lead angle ... (Nm): Mc + M µ = Where: M c M µ kc ap f D kc � a p � f � D (. − ap �D)  = Torque cutting (Nm), = Torque and Frictional effects (Nm), = Specific cutting force (N mm–1), = Depth of cut (mm), ... respectively (kW), vc = Cutting speed (m min–1) ∴P = Pc + Pµ/η Where: η = Machine tool efficiency 3.2 Boring Tool Technology – Introduction The technology of boring has shown some important advances...

Ngày tải lên: 21/06/2014, 21:20

... both cutting efficiency and tool life, • Unacceptable machined surface texture – vibrations in the form of workpiece surface chatter, can be the cause for component rejection, • Substandard machined ... tendencies could occur, leading to a variety of unwanted machining and workpiece characteristics, these include: • Limited tool life – caused by forced and self-excited vibrations, restricting ... any stiction and frictional effects, but to help dampen these structural elements Machine tool builders are acutely aware that certain machine tool materials ‘damp’ more readily than others Cast...

Ngày tải lên: 21/06/2014, 21:20

... hole errors caused by an incorrect drill point geometry and the manufacturing techniques for its subsequent correction 137 138 Chapter Figure 71.  Reaming can correct an assymetrically drilled ... precisely machined to the part’s centreline in-situ 51 ‘Telescopic line-boring tool  , One major machine tool builder in association with a tooling manufacturer, produced a rather novel and clever ... which can account for >55,000 complexreaming operations per week Conversely, for defence vehicle engines the production volumes are quite low, accounting for

Ngày tải lên: 21/06/2014, 21:20

... Phase Characteristics of Self-excited Chatter in Cutting J for Eng’g for Ind., ASME Pub., Vol 114, 393–399, Nov 1992 146 Chapter Klein, R.R and Nachtigal, C. L A Theoretical Basis for Active Control ... potential, sacrificing some of the lubricating abilities) Hole too small i) Tool tolerance incorrect (ii) Ductile material that contracts after reaming – possibly eliminated by using a quick spiral ... Sandvik Coromant, 1980 147 Modern Metal Cutting – Part 9: Drilling Tools AB Sandvik Coromant, 1981 Modern Metal Cutting – A Practical Handbook AB Sandvik Coromant Pub., 1994 Shaw, M .C Metal Cutting...

Ngày tải lên: 21/06/2014, 21:20

... key – cartridges [Courtesy of Sandvik Coromant] Appendix Appendix 1d.  ISO code key – indexable inserts [Courtesy of Sandvik Coromant] 553 554 Appendix Appendix 2.  The characterisation of chip ... ISO code key – external toolholders [Courtesy of Sandvik Coromant] Appendix Appendix 1b.  ISO code key – solid boring bars [Courtesy of Sandvik Coromant] 551 552 Appendix Appendix 1c.   ISO code ... forms [Courtesy of ISO: extract from ISO 3685:1977 (E)] Appendix Appendix 3.  Trouble-shooting for turning operations (1) [Courtesy of Mitsubishi Carbide] 555 556 Appendix Appendix 3.  (continued)...

Ngày tải lên: 05/08/2014, 21:21

... thread cutting tools [Courtesy of Guhring] 561 562 Appendix Appendix 7a.  (continued) Tap trouble-shooting guide (I) – problems, causes and solutions, with reground thread cutting tools [Courtesy ... problems, causes and solutions, with reground thread cutting tools [Courtesy of Guhring] Appendix Appendix 8.  Conventional thread turning trouble-shooting guide – problems, causes and solutions [Courtesy ... assessment techniques – for component profile traces of “departures from roundness” [Courtesy of Taylor Hobson] 567 568 Appendix Appendix 9b.  Filtering techniques are used to isolate the effects of...

Ngày tải lên: 05/08/2014, 21:21

... Appendix 11.  (continued) Typical wear patterns on cutting inserts – with possible causes and remedies [Courtesy of Sandvik Coromant] Appendix Appendix 12.  Hardness comparison table [Courtesy of ... Ratio)/Abbott-Firestone curve – hybrid parameters [Courtesy of Taylor Hobson] Appendix Appendix 11.  Typical wear patterns on cutting inserts – with possible causes and remedies [Courtesy of Sandvik Coromant] ... amplitude parameter – its derivation [Courtesy of Taylor Hobson] Appendix Appendix 1 0c.   HSC (High Spot Count) and the Rsm (mean peak spacing) – spacing parameters [Courtesy of Taylor Hobson] 571 572...

Ngày tải lên: 05/08/2014, 21:21