EP0085463A1 - A method for manufacturing a pressure roller - Google Patents

A method for manufacturing a pressure roller Download PDF

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Publication number
EP0085463A1
EP0085463A1 EP83200132A EP83200132A EP0085463A1 EP 0085463 A1 EP0085463 A1 EP 0085463A1 EP 83200132 A EP83200132 A EP 83200132A EP 83200132 A EP83200132 A EP 83200132A EP 0085463 A1 EP0085463 A1 EP 0085463A1
Authority
EP
European Patent Office
Prior art keywords
pressure roller
studs
welding
profile
surface profile
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP83200132A
Other languages
German (de)
French (fr)
Inventor
Franciscus Antonius M. Van Deuren
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SIMON-HEESEN BV
Original Assignee
SIMON-HEESEN BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SIMON-HEESEN BV filed Critical SIMON-HEESEN BV
Publication of EP0085463A1 publication Critical patent/EP0085463A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/20—Roller-and-ring machines, i.e. with roller disposed within a ring and co-operating with the inner surface of the ring
    • B30B11/201—Roller-and-ring machines, i.e. with roller disposed within a ring and co-operating with the inner surface of the ring for extruding material
    • B30B11/208—Roller constructions; Mounting of the rollers

Definitions

  • the invention relates to a method for manufacturing a pressure roller especially for a pellet mill, whereby a cylindrical body on the outer side is provided locally with a surface profile preferably in the form of studs.
  • a pressure roller of a pellet mill has only a restricted life as a result of abrasion during the rolling of the pressure roller against the inner surface of the annular die. Obviously this abrasion is strongly dependent on the nature of the material to be pressed.
  • the life is also dependent on the pressing pressure, which is required to prepare a solid pellet from the powdery material to be pressed and on the speed with which the pressing takes place.
  • the costs of the pressure rollers are expressed in the cost per ton pressed product.
  • the cylindrical surface of the cylindrical body is provided with grooves extending circumferentially and in axial direction, in which grooves the feet of studs are glued.
  • These studs are formed as separate bodies and are very wear-proof.
  • Said grooves must be arranged in the cylindrical body with narrow tolerances.
  • the studs must be manufactured with very narrow tolerances and must be subjected to a heat treatment. The studs are easily loosened from the cylindrical body during pressing.
  • the invention aims to improve the known method and this is reached, in that the surface profile is obtained by locally welding of welding material on the outer surface of the cylindrical body.
  • the material of the cylindrical body can be cheap of composition as is the case at the method according to the French Patent Specification.
  • the only requirement which must be fulfilled is that the material must be well weldable, thus must have a low carbon contents.
  • the quality or hardness of the wearing layer obtained by welding can easily be varied, whereby the costs are determining.
  • the profile of the outer side of the pressure roller is formed during the welding.
  • the welding method is carried out in such a way, that during arranging a wear-proof layer, this layer is arranged in such a pattern on the basis material, that a further machining is superfluous and whereby the profile is maintained sufficiently during the whole life of the pressure roller.
  • the choice of material for the pressure roller is then very important. More wear-proof materials are of course more expensive than less wear-prcof materials.
  • This surface profile is then obtained by taking away material from the not yet hardened cylindrical body by means of machining, until the required surface profile is obtained, after which the pressure roller is hardened.
  • the surface profile consists then of the same material as the pressure roller itself and moreover the pressure roller must still be hardened.
  • the material of the pressure roller is a cheap material, the profile will not be very wear-proof.
  • the whole pressure roller must consist of an expensive material.
  • the rim-shaped body of the pressure roller is indicated with 1 and may consist of cheap material, just as steel with a low carbon contents, but the material must be well weldable.
  • the cylindrical outer surface is provided with studs 2 of a desired height and diameter during supply of welding material.
  • the height of the studs 2 is dependent on the diameter of the body 1 and may be between 1 and 8 mm.
  • the diameter of the studs is also dependent on the diameter of the body and the material to be pressed.
  • the diameter of the studs is preferably between 10 and 30 mm.
  • the ratio between diameter and height of the studs must be as favourable as possible. A favourable ratio is 4 : 1.
  • a greater height of the studs gives the pressure roller a longer life.
  • the welding takes preferably place by arc-welding, whereby inert gases or active gases and a filled or solid welding wire may be used.
  • the used welding process is further conventional, but must be adapted to the aimed purpose.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Crushing And Grinding (AREA)
  • Rolls And Other Rotary Bodies (AREA)

Abstract

A method for manufacturing a pressure roller especially for a pellet mill, whereby a cylindrical body (1) on the outer side is provided locally with a surface profile preferably in the form of studs (2), which surface profile is obtained by locally welding of welding material on the outer surface of the cylindrical body.

Description

  • The invention relates to a method for manufacturing a pressure roller especially for a pellet mill, whereby a cylindrical body on the outer side is provided locally with a surface profile preferably in the form of studs.
  • Such a method is known from French Patent Specification 1,311,900.
  • A pressure roller of a pellet mill has only a restricted life as a result of abrasion during the rolling of the pressure roller against the inner surface of the annular die. Obviously this abrasion is strongly dependent on the nature of the material to be pressed.
  • The life is also dependent on the pressing pressure, which is required to prepare a solid pellet from the powdery material to be pressed and on the speed with which the pressing takes place.
  • By a user of the press, such as a mill owner for forage the costs of the pressure rollers are expressed in the cost per ton pressed product.
  • Thus, for the owner of the press it is desired to maintain these costs as low as possible, thus to reach a life of the pressure rollers which is as long as possible, in relation to the lowest possible costs.
  • At the method according to the French Patent Specification 1,311,900 the cylindrical surface of the cylindrical body is provided with grooves extending circumferentially and in axial direction, in which grooves the feet of studs are glued. These studs are formed as separate bodies and are very wear-proof.
  • This known method has different disadvantages. Said grooves must be arranged in the cylindrical body with narrow tolerances. The studs must be manufactured with very narrow tolerances and must be subjected to a heat treatment. The studs are easily loosened from the cylindrical body during pressing.
  • The invention aims to improve the known method and this is reached, in that the surface profile is obtained by locally welding of welding material on the outer surface of the cylindrical body.
  • The material of the cylindrical body can be cheap of composition as is the case at the method according to the French Patent Specification. The only requirement which must be fulfilled is that the material must be well weldable, thus must have a low carbon contents.
  • The quality or hardness of the wearing layer obtained by welding can easily be varied, whereby the costs are determining.
  • The profile of the outer side of the pressure roller is formed during the welding. The welding method is carried out in such a way, that during arranging a wear-proof layer, this layer is arranged in such a pattern on the basis material, that a further machining is superfluous and whereby the profile is maintained sufficiently during the whole life of the pressure roller.
  • It is observed that welding pressure rollers is known per se, see for instance Dutch published application 7710098. Hereby no profile is formed. The whole surface is covered with a layer of welding material.
  • From the practice it is known to harden the pressure roller by means of a heat treatment, either completely or only over a layer at the outer side in order to obtain a long life for the surface of the pressure roller, which is exposed to wearing.
  • The choice of material for the pressure roller is then very important. More wear-proof materials are of course more expensive than less wear-prcof materials.
  • Making thinner the pressure roller is neither unlimited, owing to the very high pressing pressures which can occur. In order to give the pressure roller sufficient grip so that the material to be pressed can be taken along and the offered quantity can be worked up the pressure roller is mostly provided with a surface profile.
  • This surface profile is then obtained by taking away material from the not yet hardened cylindrical body by means of machining, until the required surface profile is obtained, after which the pressure roller is hardened.
  • The surface profile consists then of the same material as the pressure roller itself and moreover the pressure roller must still be hardened. When the material of the pressure roller is a cheap material, the profile will not be very wear-proof. For a morep-proof profile the whole pressure roller must consist of an expensive material.
  • The invention will now be explained with reference to the drawing, in which:
    • Figure 1 is a side view of the pressure roller according to the invention, and
    • Figure 2 is a top view of said pressure roller.
  • The rim-shaped body of the pressure roller is indicated with 1 and may consist of cheap material, just as steel with a low carbon contents, but the material must be well weldable.
  • With a conventional welding process the cylindrical outer surface is provided with studs 2 of a desired height and diameter during supply of welding material. The height of the studs 2 is dependent on the diameter of the body 1 and may be between 1 and 8 mm. The diameter of the studs is also dependent on the diameter of the body and the material to be pressed. The diameter of the studs is preferably between 10 and 30 mm. The ratio between diameter and height of the studs must be as favourable as possible. A favourable ratio is 4 : 1.
  • A greater height of the studs gives the pressure roller a longer life.
  • It is favourable when about 75% of the cylindrical surface of the pressure roller is provided with welded material.
  • The welding takes preferably place by arc-welding, whereby inert gases or active gases and a filled or solid welding wire may be used. The used welding process is further conventional, but must be adapted to the aimed purpose.
  • Of course, also other profiles are possible, just as a fishbone profile and so on. However, a stud profile is preferred.

Claims (5)

1. A method for manufacturing a pressure roller especially for a pellet mill, whereby a cylindrical body on the outer side is provided locally with a surface profile preferably in the form of studs, charac- terized in that the surface profile is obtained by locally welding of welding material on the outer surface of the cylindrical body.
2. A method according to claim 1, charac- terized in that the arranged surface profile has a thickness of 1-8 mm.
3. A method according to claim 1 or 2, whereby the profile exists of round studs arranged in longitudinal and cross rows, characterized in that the diameter of the studs is between 10 and 30 mm.
4. A method according to claim 2 or 3, charac- terized in that the ratio between diameter and height of the studs is about 1 : 4.
5. Pressure roller provided with a surface profile manuafactured with the method according to one or more of the preceding claims.
EP83200132A 1982-01-28 1983-01-25 A method for manufacturing a pressure roller Withdrawn EP0085463A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8200314A NL8200314A (en) 1982-01-28 1982-01-28 METHOD FOR MANUFACTURING A PRESS ROLLER
NL8200314 1982-01-28

Publications (1)

Publication Number Publication Date
EP0085463A1 true EP0085463A1 (en) 1983-08-10

Family

ID=19839148

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83200132A Withdrawn EP0085463A1 (en) 1982-01-28 1983-01-25 A method for manufacturing a pressure roller

Country Status (3)

Country Link
EP (1) EP0085463A1 (en)
DK (1) DK31783A (en)
NL (1) NL8200314A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2548702A1 (en) * 1983-07-09 1985-01-11 Kronimus Betonsteinwerk Artificial paving stone
WO1999015329A1 (en) 1996-04-18 1999-04-01 Luxor S.A.R.L. Pressure roller for pellet machine and pellet machine equipped with such rollers

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2875709A (en) * 1956-11-08 1959-03-03 Landers Harvey Smith Pressure roller for pellet mill
FR1311900A (en) * 1961-10-13 1962-12-14 Schuechtermann & Kremer Profile cylinder for cylinder press
FR2364732A1 (en) * 1976-09-16 1978-04-14 Ingersoll Rand Co PROCESS FOR FORMING A HARD SURFACE LAYER ON A PIECE OF METAL, IN PARTICULAR STEEL
GB2047593A (en) * 1979-03-20 1980-12-03 Sherritt Gordon Mines Ltd A method of protecting a metallic surface susceptible to abrasion by rock-like material

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2875709A (en) * 1956-11-08 1959-03-03 Landers Harvey Smith Pressure roller for pellet mill
FR1311900A (en) * 1961-10-13 1962-12-14 Schuechtermann & Kremer Profile cylinder for cylinder press
FR2364732A1 (en) * 1976-09-16 1978-04-14 Ingersoll Rand Co PROCESS FOR FORMING A HARD SURFACE LAYER ON A PIECE OF METAL, IN PARTICULAR STEEL
GB2047593A (en) * 1979-03-20 1980-12-03 Sherritt Gordon Mines Ltd A method of protecting a metallic surface susceptible to abrasion by rock-like material

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2548702A1 (en) * 1983-07-09 1985-01-11 Kronimus Betonsteinwerk Artificial paving stone
WO1999015329A1 (en) 1996-04-18 1999-04-01 Luxor S.A.R.L. Pressure roller for pellet machine and pellet machine equipped with such rollers

Also Published As

Publication number Publication date
DK31783A (en) 1983-07-29
NL8200314A (en) 1983-08-16
DK31783D0 (en) 1983-01-27

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB NL

17P Request for examination filed

Effective date: 19840209

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19850731

RIN1 Information on inventor provided before grant (corrected)

Inventor name: VAN DEUREN, FRANCISCUS ANTONIUS M.