Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
  • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
  • B02C4/00—Crushing or disintegrating by roller mills
  • B02C4/28—Details
  • B02C4/30—Shape or construction of rollers
  • B02C4/305—Wear resistant rollers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B15/00—Layered products comprising a layer of metal
  • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C13/00—Rolls, drums, discs, or the like; Bearings or mountings therefor
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C2223/00—Surface treatments; Hardening; Coating
  • F16C2223/30—Coating surfaces
  • F16C2223/46—Coating surfaces by welding, e.g. by using a laser to build a layer

Definitions

• the invention relates to a wear-resistant surface armor for the rollers of roller machines, in particular of high-pressure roller presses for pressure comminution of granular goods.
• the armor layer cannot be made as thick as desired, because only a maximum of about three welding layers, each about 3 mm thick, can be welded onto one another to form an overall maximum of about 9 mm thick armor layer. If the number of weld layers built up on top of one another from the hard armor material were increased, there is a risk that the armor layer would crack and possibly at least partially flake off due to the stresses. A layer of armor of z. B. only 9 mm thick is worn out comparatively quickly if, with the appropriately armored rollers, the above-mentioned material bed comminution of very hard materials such as, for. B. certain ores is performed. However, the operators of such two-roller machines require a machine with roller armor, the service life of which is long because each stoppage of the machine causes a very high loss for the operator.
• the object of the invention is to create a wear-resistant surface coating for the rollers of roller machines, in particular high-pressure roller presses, which has a long service life and can be applied economically to the roller base body.
• This object is achieved according to the invention with a roller armor and with an application method, which are characterized in advantageous embodiments in claims 1 to 6.
• a ductile metallic buffer layer or intermediate layer and a hard wear-resistant armor layer are alternately welded onto the roller base body radially from the inside out, d. H.
• the total thickness of the armor according to the invention and thus also its service life can in principle be made arbitrarily high or multiplied as required. Longer downtimes of the repair less often mean downtimes of the machine, which means less losses due to downtimes for the machine operator.
• the tougher metallic intermediate layers which are more ductile in comparison to the armored layers, are each able to compensate for the stresses occurring in the armor according to the invention and each to carry a new armored layer.
• the intermediate layer arranged between the individual armor layers advantageously consists in each case of a single weld layer, while the armor layers each consist of several weld layers.
• the thickness of the single-layer intermediate layer can be in a range of e.g. B. 1 to 6 mm, while the thickness of the multilayer, z. B. two- or three-layer armor layer can be about 8 to about 15 mm.
• the thickness of the single-layer intermediate layer is as thin as necessary, e.g. B. 3 mm, thickness of the multilayered armor layer z. B. 9 mm, manufactured from z. B. three welding layers of 3 mm each or two welding layers of 4.5 mm each.
• On the Walzengrundk ⁇ rper can z. B. 15 welding layers can be welded on one after the other.
• the ductile metallic intermediate layers of the roller armor according to the invention consist of a ferritic material with a hardness of more than about 20 to about 45 HRC (Rockwell C hardness test).
• the material of the armor layers which has a hardness of more than 52 HRC, can consist of a metallic alloy using special carbide and nitride formers. Such a material is e.g. B. described in patent application P 38 32 225.0.
• the service life of the roller armor according to the invention is high even in the case of a dynamic pressure threshold stress. Large jumps in hardness within the roller armor during the transition from the armor layers to the intermediate layers should be avoided.
• a method for building up the roller armor is characterized in that the intermediate layers are applied by submerged-arc strip welding and the armored layers by submerged-arc filler coating welding.
• the alloy components are in powder form in a z. B. from Pure flat hollow band filled with pure iron and the actual alloy itself only arises during the welding process.
• the full band build-up welding ensures an even distribution of the armor material alloy and a uniform coating build-up.

Landscapes

• Engineering & Computer Science (AREA)
• Food Science & Technology (AREA)
• Crushing And Grinding (AREA)
• Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6369804

Family Applications (1)

Country Status (8)

Cited By (1)

Families Citing this family (8)

Citations (2)

Family Cites Families (2)

• 1988
  • 1988-12-22 DE DE3843173A patent/DE3843173A1/de active Granted
• 1989
  • 1989-11-16 JP JP1511630A patent/JPH03502780A/ja active Pending
  • 1989-11-16 EP EP89912398A patent/EP0402435A1/de not_active Withdrawn
  • 1989-11-16 WO PCT/DE1989/000718 patent/WO1990006811A1/de not_active Application Discontinuation
  • 1989-11-16 BR BR898907258A patent/BR8907258A/pt unknown
  • 1989-12-21 DD DD89336074A patent/DD286304A5/de not_active IP Right Cessation
  • 1989-12-21 ZA ZA899820A patent/ZA899820B/xx unknown
• 1990
  • 1990-08-21 DK DK199690A patent/DK199690D0/da not_active Application Discontinuation

Patent Citations (2)

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