anglicky v odborn ch p edm tech support of teaching technical subjects in english
Download
Skip this Video
Download Presentation
Anglicky v odborných předmětech "Support of teaching technical subjects in English “

Loading in 2 Seconds...

play fullscreen
1 / 15

Anglicky v odborných předmětech "Support of teaching technical subjects in English “ - PowerPoint PPT Presentation


  • 54 Views
  • Uploaded on

Anglicky v odborných předmětech "Support of teaching technical subjects in English “. Tutorial : Engineering technology Topic : Sintered metallic materials Prepared by: Ing. Elena Nová. Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Anglicky v odborných předmětech "Support of teaching technical subjects in English “' - lerato


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
anglicky v odborn ch p edm tech support of teaching technical subjects in english

Anglicky v odborných předmětech"Support ofteachingtechnicalsubjects in English“

Tutorial: Engineering technology

Topic: Sinteredmetallicmaterials

Prepared by: Ing. Elena Nová

Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002

je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.

sintered metallic materials1
Sintered metallic materials

Sintered materials

Are produced from metallic powders steel / copper / tin / aluminum, which are pressed under great power into required shapes and in next process – sintering – are bonded into a new material with very high strength.

sintered metallic materials2
Sintered metallic materials
  • Advantages of powder metallurgy:
  • Possibility to create complicated shapes (geared wheels, shapes, parts of absorbers etc.)
  • Possibility to make self greasing / benefit of porosity / sliding gears
  • Dimensional accuracy gain by precision tools for pressing and calibration
  • Complete usage of entry material (without waste) High efectivity in manufacturing of large series
sintered metallic materials3
Sintered metallic materials
  • Disadvantages of sintering technology
  • Great press force is required
  • Press moulds are expensive
  • Size of products is limited due to pressing force and smaller net densening inside large products
  • Shape difficult parts with transversal holes or threads are not possible to press out.
sintered metallic materials4
Sintered metallic materials
  • Technological process:
  • 1. Production of metal’s powder
  • 2. Mixing of press mixtures to achieve required chemical-physical properties of final product
  • 3. Pressing – pressed powder has geometrical shape of the final product
  • 4. Sintering – is made in an Oven with protective atmosphere at max. temp. 1140 deg.
  • 5. Final operation – depends on product applicability:
  • - calibration - conservation- saturation- honing- machining
sintered metallic materials5
Sintered metallic materials
  • Powder manufacturing
  • Powders are produced as follows
  • - Physical – milling and crushing, is used mainly for Cu, Fe, Al, Cr, Mn
  • - atomization of liquid metal by air or water mainly for Pb, Zn, Sn, Al, Fe
  • - steam condensation used mainly for Zn, Cd
  • - chemically based on ore reduction is used with Cu, Ag, Fe, Ni, Co, W, Mo, Ti.
sintered metallic materials6
Sintered metallic materials
  • Powders treatment
  • Mostly by
  • - powder reduction after their manufacture by spraying air
  • - powder drying off after their manufacture by spraying of water
  • - screening and classification of powder according to size of particles
  • - addition of other parts in accordance with production special requirements
  • - grease addition to improve pressing
sintered metallic materials7
Sintered metallic materials
  • Powder pressing
  • Purpose is to achieve partly compact basic shape of final product before sintering.
  • Pressures therefore move in a range of 200 to2000 Mpa.
  • Strait-forward pressing can be
  • - one sided (pic. a)
  • - both sided (pic. b)
  • - from all sides (pic. c)
sintered metallic materials8
Sintered metallic materials
  • At rolling - powder from holder entry between rolls, which press and compact it. Product are rods or strips
  • At extrusion through calibrated opening produce semi-products of rod’s shape.
sintered metallic materials9
Sintered metallic materials
  • Powder Sintering
  • Sintering we understand a heat influencing on semi-product made in previous operation – compacting.
  • Sintering temperature depends on composition of coupled material.
  • In a case of semi-product sintering made from a single material, the chosen temperature is about 80% of its melting temperature.
  • Joining of powder particles is by diffusion.
sintered metallic materials10
Sintered metallic materials
  • Sintering
  • Due to danger of oxidation is sintering made in protective atmosphere.
  • Calibration
  • Sintered products have satisfactory dimensional accuracy and surface quality. At a very high accuracy requirements a high precision calibration form is used.
answer the questions
Answer the questions:
  • What is a sintering?
  • What steps are used for manufacturing of sintered products?
  • How accurate are sintered products?
  • Advantages of sintering materials?
  • Disadvantages of sintering materials?
pou it literatura
Použitá literatura
  • http://www.ksp.tul.cz/cz/kpt/obsah/vyuka/skripta_tkp/sekce/04.htm
ad