EP1127632B1 - A process of straightening fragile pieces - Google Patents

A process of straightening fragile pieces Download PDF

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Publication number
EP1127632B1
EP1127632B1 EP00203669A EP00203669A EP1127632B1 EP 1127632 B1 EP1127632 B1 EP 1127632B1 EP 00203669 A EP00203669 A EP 00203669A EP 00203669 A EP00203669 A EP 00203669A EP 1127632 B1 EP1127632 B1 EP 1127632B1
Authority
EP
European Patent Office
Prior art keywords
mentioned
piece
straightening
error
process according
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
EP00203669A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1127632A2 (en
EP1127632A3 (en
Inventor
Luigi Galdabini
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.)
Cesare Galdabini SpA
Original Assignee
Cesare Galdabini SpA
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 Cesare Galdabini SpA filed Critical Cesare Galdabini SpA
Publication of EP1127632A2 publication Critical patent/EP1127632A2/en
Publication of EP1127632A3 publication Critical patent/EP1127632A3/en
Application granted granted Critical
Publication of EP1127632B1 publication Critical patent/EP1127632B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
    • B21D3/10—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts between rams and anvils or abutments

Definitions

  • the object of this invention is a process for straightening fragile pieces.
  • a process for straightening pieces is known from US-A-4154073.
  • This operation is generally performed by straightening machines, in which the piece to be straightened is held between two terminal supports of a point and counterpoint type, and deformed by the action of a punch in the previously established direction of the maximum error.
  • the quantity of material involved and the size of the deformation is proportional to the error to be reduced, while the remaining value remains within the elastic limits.
  • the straightening may occur in other than the maximum direction.
  • the scope of this invention is therefore to achieve a straightening process for fragile pieces capable of overcoming the mentioned problems, while in particular avoiding the undesirable rupturing or cracking of fragile pieces.
  • the quantity of the material involved in the deformation increases, and the required elongation ⁇ therefore decreases.
  • the process of straightening according to this invention is performed by using a straightening machine, in which a piece 11 to be straightened is held between two terminal supports of a point and counterpoint type, 24 and 25, and deformed by the action of a punch.
  • Figure 1 shows a schematic view, for explanatory purposes of the process of the invention, of a piece 11 to be straightened, held by the point and counterpoint supports 24 and 25, while a punch represented in various operating positions P2, P3 and P4 acts on the same.
  • the piece 11 is also held up by the underlying supports 21, 22, 23 and acted upon by the probes S0, S2, S3, S5 and S7, which serve for determining the degree of eccentricity to be corrected.
  • the straightening of the piece 11 follows the diagram shown in Figure 2, both by determining the direction of the maximum error by methods already known in the art, as well as by utilizing the probes S0, S2, S3, S5 and S7.
  • the piece 11 to be straightened is rotated on its supports of the point and counterpoint type 24 and 25, while one or more sensors, acting on the periphery of the piece 11, emit a signal proportional to the apparent radius of the piece 11, with respect to the axis identified by the supports 24 and 25.
  • This signal generated by the probes S0, S2, S3, S5 and S7, is processed according to a mathematical development of the Fourier series and in particular determined by the first harmonic of the Fourier series, so as to position the piece 11 by rotating it to the point corresponding to the maximum value of said first harmonic.
  • the process further outlines a parameter for every straightening phase, which defines the threshold error over which the application of the process of this invention begins.
  • This threshold is related to the maximum allowable deformation of the material, and is experimentally determined.
  • the component R 1 is oriented in the direction of the maximum error, while the components R 2 and R 3 are oriented with respect to R 1 by ⁇ ⁇ °.
  • a particularly preferred value of the angle ⁇ ° is 30°, so that in this case the components R 2 and R 3 turn out to be oriented with respect to R 1 by ⁇ 30°.
  • Block 16 therefore performs a straightening phase in the direction R 1 in which the intensity of the blow or blows is proportional to the module of this vector.
  • the piece 11 is rotated by ⁇ ° in such a way to be oriented according to the direction R 2 and, in block 17, a straightening phase is performed in which the intensity of the blow is proportional to the module of the vector R 2.
  • the piece 11 is finally rotated by ⁇ ° so as to be oriented in the direction R 3 and block 18 performs a further straightening phase in which the intensity of the blow or blows is proportional to the module of the vector R 3.
  • a variant of the process of the invention allows utilizing a number of vector components above three, if the size of the initial error is such as to produce three components above the threshold defined as the maximum capable of being straightened.
  • the quantity of material involved by the deformation increases, and the required elongation e consequently decreases.
  • the error to be straightened is split up into at least three vectors R 1, R 2, R 3 of an identical module but phased out by an angle ⁇ ° from each other, straightened in sequence.
  • the phases of the process of the invention may be performed automatically, by equipping the straightening machine with a processing program.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wire Processing (AREA)
  • Forging (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
  • Manufacture Of Motors, Generators (AREA)
EP00203669A 2000-02-22 2000-10-20 A process of straightening fragile pieces Expired - Lifetime EP1127632B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITMI200319 2000-02-22
IT2000MI000319A IT1316652B1 (it) 2000-02-22 2000-02-22 Procedimento di raddrizzatura per pezzi fragili
ITMI20000319 2000-02-22

Publications (3)

Publication Number Publication Date
EP1127632A2 EP1127632A2 (en) 2001-08-29
EP1127632A3 EP1127632A3 (en) 2002-03-06
EP1127632B1 true EP1127632B1 (en) 2003-12-10

Family

ID=11444133

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00203669A Expired - Lifetime EP1127632B1 (en) 2000-02-22 2000-10-20 A process of straightening fragile pieces

Country Status (3)

Country Link
EP (1) EP1127632B1 (it)
DE (1) DE60007065T2 (it)
IT (1) IT1316652B1 (it)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006010040B3 (de) * 2006-03-04 2007-10-11 Eisenbau Krämer mbH Richtmaschine
JP6076282B2 (ja) * 2014-03-14 2017-02-08 ジヤトコ株式会社 ワークの曲がり矯正方法
CN112275846A (zh) * 2020-11-04 2021-01-29 荆州环球汽车零部件制造有限公司 一种凸轮轴校直装置及方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1078390B (it) * 1977-01-21 1985-05-08 Galdabini Renzo Macchina a raddrizzare automatica
IT1097410B (it) * 1978-07-26 1985-08-31 Galdabini Renzo Macchina per il raddrizzamento automatico di pezzi allungati

Also Published As

Publication number Publication date
DE60007065D1 (de) 2004-01-22
IT1316652B1 (it) 2003-04-24
DE60007065T2 (de) 2004-09-23
EP1127632A2 (en) 2001-08-29
EP1127632A3 (en) 2002-03-06
ITMI20000319A1 (it) 2001-08-22
ITMI20000319A0 (it) 2000-02-22

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