scholarly journals A modified tool design for the drilling of high-performance aerospace materials

CIRP Annals ◽  
2021 ◽  
Author(s):  
I. Iovkov ◽  
M. Bücker ◽  
D. Biermann
Keyword(s):  
High Performance ◽  
Tool Design ◽  
Aerospace Materials

High Performance Spindle Systems for Heavy Duty Milling of Difficult-To-Cut Aerospace Materials

2012 ◽  
Vol 6 (1) ◽  
pp. 43-56
Author(s):  
Masakazu Soshi ◽  
Shinji Ishii ◽  
Peter Fonda ◽  
Kazuo Yamazaki
Keyword(s):  
High Performance ◽  
Heavy Duty ◽  
Aerospace Materials

High Performance Cutting of Aerospace Materials

2012 ◽  
Vol 498 ◽  
pp. 127-132 ◽  
Author(s):  
A. Krämer ◽  
Dieter Lung ◽  
Fritz Klocke
Keyword(s):  
High Performance ◽  
Physical And Mechanical Properties ◽  
Cryogenic Cooling ◽  
Process Stability ◽  
Aerospace Materials ◽  
Manufacturing Costs ◽  
High Temperature Alloys ◽  
Cutting Ceramics ◽  
Nickel Based Alloy ◽  
Cutting Speeds

Titanium and nickel-based alloys belong to the group of difficult-to-cut materials. The machining of these high-temperature alloys is characterized by low productivity and low process stability as a result of their physical and mechanical properties. Major problems during the machining of these materials are low applicable cutting speeds due to excessive tool wear, long machining times, and thus high manufacturing costs, as well as the formation of ribbon and snarled chips. Under these conditions automation of the production process is limited. This paper deals with strategies to improve machinability of titanium and nickel-based alloys. Using the example of the nickel-based alloy Inconel 718 high performance cutting with advanced cutting materials, such as PCBN and cutting ceramics, is presented. Afterwards the influence of different cooling strategies, like high-pressure lubricoolant supply and cryogenic cooling, during machining of TiAl6V4 is shown.

Development of a high-performance chip-guiding turning process—tool design and chip flow control

2015 ◽  
Vol 85 (1-4) ◽  
pp. 791-805 ◽  
Author(s):  
Tomoya Aoki ◽  
Burak Sencer ◽  
Eiji Shamoto ◽  
Norikazu Suzuki ◽  
Tomio Koide
Keyword(s):  
Flow Control ◽  
High Performance ◽  
Tool Design ◽  
Turning Process ◽  
Chip Flow

Potential of Carbide Tools for High Performance Hobbing

2003 ◽  
Author(s):  
Fritz Klocke ◽  
Oliver Winkel
Keyword(s):  
High Performance ◽  
Tool Design ◽  
Production Costs ◽  
Optimum Process ◽  
Base Line ◽  
Future Goals ◽  
Tool Performance ◽  
Upper Level ◽  
High Level ◽  
Coated Carbide

To match the future goals of higher productivity and lower production costs, the cutting speeds and feeds in modern gear hobbing applications have to increase further. In several cases, coated carbide tools have substituted the commonly used HSS tools. Because this leads to production processes working on the upper level of their performance opportunities, the tolerances for deviations from the optimum process settings are getting smaller. To match with this situation, especially in carbide hobbing, all factors that have an influence on the hobbing process like the workpiece geometry, the process parameters and especially the tool design have to be taken into account if a high level of process performance is desired. This essay will present a case study based on two industrial gearings. The investigations include the influence of the tool design concerning coating, substrate, layout and edge preparation on the tool performance. In detail, fundamental base line trials using the analogy process “fly-cutter hobbing” will be presented. Besides several coating and substrate combinations also different tool layouts have been tested. To verify the results, real hobbing trials under industrial production conditions have been carried out as well. Finally, the potential of modern simulation and calculation programs to optimize hobbing processes will be shown. The report aims to give new impulses to the tool design of carbide hobs and an optimized process setting.

Miscible Blends of Poly(siloxane Imide) Segmented Copolymers and Polybenzimidazole as Potential High Performance Aerospace Materials

1990 ◽  
Vol 2 (2) ◽  
pp. 83-94 ◽  
Author(s):  
C. A. Arnold ◽  
D. H. Chen ◽  
Y. P. Chen ◽  
R. O. Waldbauer ◽  
M. E. Rogers ◽  
...  
Keyword(s):  
High Performance ◽  
Aerospace Materials ◽  
Segmented Copolymers ◽  
Miscible Blends

A High Performance Energy Analyzer for Use in Electron Scanning Microscopy

1969 ◽  
Vol 27 ◽  
pp. 14-15
Author(s):  
A. V. Crewe ◽  
M. Isaacson ◽  
D. Johnson
Keyword(s):  
High Performance ◽  
Vertical Plane ◽  
Median Plane ◽  
Electron Gun ◽  
Uniform Field ◽  
Loss Mechanism ◽  
Electron Scanning Microscopy ◽  
Sector Type ◽  
Double Focusing ◽  
Electron Energy Loss

A double focusing magnetic spectrometer has been constructed for use with a field emission electron gun scanning microscope in order to study the electron energy loss mechanism in thin specimens. It is of the uniform field sector type with curved pole pieces. The shape of the pole pieces is determined by requiring that all particles be focused to a point at the image slit (point 1). The resultant shape gives perfect focusing in the median plane (Fig. 1) and first order focusing in the vertical plane (Fig. 2).

Vacuum System to Minimize the Specimen Contamination of High-Performance EM

1977 ◽  
Vol 35 ◽  
pp. 68-69
Author(s):  
N. Yoshimura ◽  
K. Shirota ◽  
T. Etoh
Keyword(s):  
Electron Microscope ◽  
High Speed ◽  
High Performance ◽  
High Vacuum ◽  
Vacuum System ◽  
Pump System ◽  
Pumping System ◽  
Diffusion Pump ◽  
Almost All ◽  
Cascade Type

One of the most important requirements for a high-performance EM, especially an analytical EM using a fine beam probe, is to prevent specimen contamination by providing a clean high vacuum in the vicinity of the specimen. However, in almost all commercial EMs, the pressure in the vicinity of the specimen under observation is usually more than ten times higher than the pressure measured at the punping line. The EM column inevitably requires the use of greased Viton O-rings for fine movement, and specimens and films need to be exchanged frequently and several attachments may also be exchanged. For these reasons, a high speed pumping system, as well as a clean vacuum system, is now required. A newly developed electron microscope, the JEM-100CX features clean high vacuum in the vicinity of the specimen, realized by the use of a CASCADE type diffusion pump system which has been essentially improved over its predeces- sorD employed on the JEM-100C.

Use of the Magnetostatic Analogue In Electromagnetic Lens Engineering

1970 ◽  
Vol 28 ◽  
pp. 360-361
Author(s):  
John W. Coleman
Keyword(s):  
Boundary Conditions ◽  
High Performance ◽  
Force Fields ◽  
Optical Design ◽  
Direct Conversion ◽  
Design Engineering ◽  
Design Data ◽  
Scalar Potentials ◽  
Geometric Elements ◽  
At Will

In the design engineering of high performance electromagnetic lenses, the direct conversion of electron optical design data into drawings for reliable hardware is oftentimes difficult, especially in terms of how to mount parts to each other, how to tolerance dimensions, and how to specify finishes. An answer to this is in the use of magnetostatic analytics, corresponding to boundary conditions for the optical design. With such models, the magnetostatic force on a test pole along the axis may be examined, and in this way one may obtain priority listings for holding dimensions, relieving stresses, etc..The development of magnetostatic models most easily proceeds from the derivation of scalar potentials of separate geometric elements. These potentials can then be conbined at will because of the superposition characteristic of conservative force fields.

Prospects for convergent beam electron diffraction with a 200kV cold field-emission transmission electron microscope

1991 ◽  
Vol 49 ◽  
pp. 466-467
Author(s):  
J W Steeds ◽  
R Vincent
Keyword(s):  
Field Emission ◽  
High Performance ◽  
Small Diameter ◽  
Convergent Beam Electron Diffraction ◽  
Zone Axis ◽  
Medium Voltage ◽  
Transmission Electron ◽  
Good Crystallinity ◽  
Special Modification ◽  
Convergent Beam

We review the analytical powers which will become more widely available as medium voltage (200-300kV) TEMs with facilities for CBED on a nanometre scale come onto the market. Of course, high performance cold field emission STEMs have now been in operation for about twenty years, but it is only in relatively few laboratories that special modification has permitted the performance of CBED experiments. Most notable amongst these pioneering projects is the work in Arizona by Cowley and Spence and, more recently, that in Cambridge by Rodenburg and McMullan.There are a large number of potential advantages of a high intensity, small diameter, focussed probe. We discuss first the advantages for probes larger than the projected unit cell of the crystal under investigation. In this situation we are able to perform CBED on local regions of good crystallinity. Zone axis patterns often contain information which is very sensitive to thickness changes as small as 5nm. In conventional CBED, with a lOnm source, it is very likely that the information will be degraded by thickness averaging within the illuminated area.

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