EP1062073B1 - A machine for grinding semi-finished products, particularly billets - Google Patents

A machine for grinding semi-finished products, particularly billets Download PDF

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Publication number
EP1062073B1
EP1062073B1 EP99911742A EP99911742A EP1062073B1 EP 1062073 B1 EP1062073 B1 EP 1062073B1 EP 99911742 A EP99911742 A EP 99911742A EP 99911742 A EP99911742 A EP 99911742A EP 1062073 B1 EP1062073 B1 EP 1062073B1
Authority
EP
European Patent Office
Prior art keywords
grinding
axis
frame
grinding wheel
billet
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.)
Expired - Lifetime
Application number
EP99911742A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1062073A1 (en
Inventor
Giorgio Carraro
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1062073A1 publication Critical patent/EP1062073A1/en
Application granted granted Critical
Publication of EP1062073B1 publication Critical patent/EP1062073B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/06—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B27/00—Other grinding machines or devices
    • B24B27/033—Other grinding machines or devices for grinding a surface for cleaning purposes, e.g. for descaling or for grinding off flaws in the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/10—Single-purpose machines or devices
    • B24B7/12—Single-purpose machines or devices for grinding travelling elongated stock, e.g. strip-shaped work

Definitions

  • the present invention relates to a machine for grinding semi-finished products, particularly billets, according to the preamble of claim 1.
  • the invention further relates to a grinding wheel for the above mentioned machine according to the preamble of claim 7 (see for example US-A-1 582 608).
  • a grinding machine having the features outlined above is known from WO-A-9622173.
  • Billets produced by rolling generally have surface irregularities mainly due to cracks, scum and other processing residues resulting from the melting and cooling processes.
  • the problem upon which the present invention is based is that of providing a machine for grinding semi-finished products, particularly billets, which is designed structurally and functionally so as to overcome all of the problems complained of with reference to the prior art mentioned.
  • the grinding wheel according to the invention is defined in claim 7.
  • a machine formed in accordance with the present invention is generally indicated 1 and is intended for grinding semi-finished products such as, for example, foundry billets 2, one of which is shown partially in the drawings.
  • the machine 1 comprises a substantially parallelepipedal framework 3 formed by two opposed frames 4 rigidly interconnected by means of four uprights 4c. Each frame 4 is formed by pairs of rigidly-interconnected longitudinal and transverse elements indicated 4a, 4b.
  • the billet 2 being ground is guided beneath the framework 3 along an axis of movement indicated by the axis B in Figure 2 and arranged parallel to the longitudinal elements 4a.
  • the machine 1 further comprises a first frame and a second frame, indicated 6 and 7, respectively, which are mounted on the framework 3 and are movable relative thereto as explained in detail in the following description.
  • the first frame 6 is mounted inside the framework 3 and is also of parallelepipedal shape.
  • the frame 6 is formed by pairs of first longitudinal elements 6a connected by first transverse elements 6b and rigidly interconnected by means of first uprights 6c.
  • each longitudinal element 4a of the framework 3 At one end of each longitudinal element 4a of the framework 3, at the same end of the framework, a respective arm 8 is articulated about a corresponding pin 8a projecting inside the framework.
  • Each arm 8 is in turn articulated at its opposite axial end to a central portion of the respective first longitudinal element 6a of the first frame 6, by means of a corresponding pin 9.
  • the arms 8 thus constitute a parallelogram device for moving the first frame 6 relative to the framework 3.
  • a pair of actuators such as, for example, two hydraulic jacks 10 shown schematically in Figure 1, is provided for moving the first frame 6.
  • Each jack 10 is mounted on a support element 11 extending from the respective upper longitudinal element 4a of the framework 3 and has a rod 12 acting on the first frame 6 in the region of the points of articulation to the arms 8.
  • the second frame 7 is mounted inside the first frame 6 and has a similar parallelepipedal shape.
  • the frame 7 is formed by a pair of opposed end structures rigidly interconnected by means of uprights 7c. Each end structure is formed by pairs of rigidly interconnected second longitudinal elements 7a and second transverse elements 7b.
  • the lower end of the second frame 7 also has connecting cross members 13 preferably formed by parallel and spaced-apart channel-sections.
  • the cross-members 13 serve to support two pairs of supports 14 with bearings 15 between which two respective shafts 16, 17 are supported for rotation.
  • a respective circular grinding wheel 18, 19 is keyed to each shaft 16, 17.
  • Each shaft 16, 17 is also arranged, at one of its ends, for coupling to a respective pulley, not shown, for rotating the corresponding grinding wheel 18, 19 about its axis of rotation, indicated M1, M2 respectively in Figure 2, by means of a belt transmission.
  • the belt transmissions are driven by respective electric motors 20 of which only one is shown in Figure 3.
  • the motors 20 are fixed to a support plate 20a provided on the upper end of the second frame 7.
  • the grinding wheels 18, 19 are positioned, relative to the second frame 7, with parallel axes of rotation M1 and M2 which are inclined angularly to an axis transverse the axis B of movement of the billet 2.
  • the transverse axis is parallel to the articulation axis of the pins 9, which is indicated K in Figure 2, and which is perpendicular to the direction of movement B.
  • the angle at which the axis M2 (or M1) is inclined to the axis K is indicated C in Figure 2.
  • the angle C may have values of between 5° and 45° and the value selected is preferably 30°.
  • the second frame 7 is also mounted for pivoting on the first frame 6 about an axis K1 parallel to the axis K.
  • the second frame 7 has supports 21 which are fixed in central positions on the second longitudinal elements 7a of the upper end of the frame 7 and are intended to be engaged on corresponding pins 9 for rotation about the axis K1.
  • the interaxial spacing D between the rotation axes M1, M2 of the grinding wheels 18, 19 is arranged symmetrically with respect to the pivot axis K1 so that the loads on the pivoting frame 7, which are due mainly to the weight of the grinding wheels themselves, are distributed in a balanced manner relative to the pivot axis K1.
  • pivot axis K1 of the second frame is spaced from the axes of rotation M1, M2 of the grinding wheels 18, 19 on the opposite side to the working plane of the grinding wheels identified by the surface 2a of the billet.
  • Each grinding wheel 18, 19 comprises a central hub 22 which is intended to be keyed to the corresponding shaft 16, 17 and on which a ring of abrasive material is mounted.
  • the ring is of the type with an interrupted edge and is thus composed of a plurality of structurally independent grinding-wheel sectors 23. More particularly, the grinding wheel comprises six identical sectors 23 each of which is defined peripherally by edge profiles 24.
  • the profiles are inclined angularly to the axis of rotation M1, M2 of the grinding wheel, as can be seen in Figure 7.
  • the angle of inclination, indicated T, selected for the edge 24 is preferably between 10° and 20°.
  • Each abrasive sector 23 is restrained on the hub 22 by means of a pair of jaws 25 clamped by screws 26 extending through the hub. It will be noted that each grinding-wheel sector 23 is spaced from the adjacent sectors peripherally by a distance indicated S in Figure 7.
  • the grinding wheels 18, 19 are moved, by means of the parallelogram device operated by the jacks 10, into contact with the surface 2a of the billet 2 being ground.
  • the billet 2 is guided beneath the framework 3 along the axis B with a sliding movement relative to the grinding wheels 18, 19 which in turn are rotated about their own axes M1 and M2 by means of the motors 20.
  • the surface 2a of the billet is ground throughout its width during the forward movement of the billet, as a result of the contributions of the grinding surfaces of both grinding wheels, as shown schematically in Figure 8.
  • This advantageously enables billets having cross-sections of much greater width than the abrasive face of the grinding wheel to be ground in a single forward run of the billet.
  • Figure 4 shows, in continuous outline, one of the grinding wheels 18, 19 placed in contact with a large billet 2 (for example having a cross-section of 200-200 mm) and, in broken outline, the grinding wheel in conditions of maximum wear (minimum diameter of the abrasive ring) in contact with the surface of a smaller billet (for example, with a cross-section of 40x40 mm).
  • grinding wheels having sectors with edge profiles which are inclined to the axis of the grinding wheel enables the abrasive surface to penetrate the billet better and, in addition, the contact between the surface of the billet and the edge takes place more gradually than with conventional grinding wheels which have edge profiles parallel to the axis of the grinding wheel and in which each grinding-wheel sector consequently strikes the billet with the entire front of the edge during rotation.
  • the use of grinding wheels with inclined edge profiles advantageously improves grinding penetration as well as achieving more uniform power absorption, at the same time preventing power-absorption peaks when the edge profile contacts the surface of the billet.
  • the abrasive material of the billet wears more evenly, optimizing the useful life of the grinding-wheel sectors.
  • the invention thus solves the problem set, achieving the aforementioned advantages in comparison with known solutions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Forging (AREA)
EP99911742A 1998-03-13 1999-03-05 A machine for grinding semi-finished products, particularly billets Expired - Lifetime EP1062073B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITPD980052 ITPD980052A1 (it) 1998-03-13 1998-03-13 Macchina per la molatura di semilavorati, in particolare di billette
ITPD980052 1998-03-13
PCT/EP1999/001437 WO1999047305A1 (en) 1998-03-13 1999-03-05 A machine for grinding semi-finished products, particularly billets

Publications (2)

Publication Number Publication Date
EP1062073A1 EP1062073A1 (en) 2000-12-27
EP1062073B1 true EP1062073B1 (en) 2002-01-16

Family

ID=11392097

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99911742A Expired - Lifetime EP1062073B1 (en) 1998-03-13 1999-03-05 A machine for grinding semi-finished products, particularly billets

Country Status (5)

Country Link
EP (1) EP1062073B1 (it)
AU (1) AU3031799A (it)
DE (1) DE69900674D1 (it)
IT (1) ITPD980052A1 (it)
WO (1) WO1999047305A1 (it)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3049056B1 (ja) 1998-07-02 2000-06-05 日本電気通信システム株式会社 移動体通信網の加入者デ―タ制御方法
JP2008119819A (ja) * 2006-10-20 2008-05-29 Jtekt Corp 凹部入り砥石の製造方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1582608A (en) * 1924-04-28 1926-04-27 Bridgeport Safety Emery Wheel Sectional grinding wheel
DE3524561A1 (de) * 1985-07-10 1987-02-05 Egon Evertz Vorrichtung zum schleifen
SE9500116L (sv) * 1995-01-16 1996-07-17 Danieli Centro Maskin Spa Förfarande vid slipning av företrädesvis ämnen och anordning för utövning av förfarandet
JPH09193024A (ja) * 1996-01-16 1997-07-29 Musashi Seimitsu Ind Co Ltd 研削砥石

Also Published As

Publication number Publication date
AU3031799A (en) 1999-10-11
EP1062073A1 (en) 2000-12-27
ITPD980052A1 (it) 1999-09-13
WO1999047305A1 (en) 1999-09-23
DE69900674D1 (de) 2002-02-21

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