WO2004071687A1 - Procede et appareil de correction automatique de l'angle de courbure d'une lame - Google Patents

Procede et appareil de correction automatique de l'angle de courbure d'une lame Download PDF

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Publication number
WO2004071687A1
WO2004071687A1 PCT/KR2003/000288 KR0300288W WO2004071687A1 WO 2004071687 A1 WO2004071687 A1 WO 2004071687A1 KR 0300288 W KR0300288 W KR 0300288W WO 2004071687 A1 WO2004071687 A1 WO 2004071687A1
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WO
WIPO (PCT)
Prior art keywords
bending
cutting blade
angle
data
bending angle
Prior art date
Application number
PCT/KR2003/000288
Other languages
English (en)
Inventor
Hong Soon Park
Original Assignee
Hong Soon Park
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 Hong Soon Park filed Critical Hong Soon Park
Priority to PCT/KR2003/000288 priority Critical patent/WO2004071687A1/fr
Publication of WO2004071687A1 publication Critical patent/WO2004071687A1/fr

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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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/04—Bending sheet metal along straight lines, e.g. to form simple curves on brakes making use of clamping means on one side of the work
    • 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
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/20—Making tools by operations not covered by a single other subclass
    • B21D37/205—Making cutting tools

Definitions

  • the present invention relates to a method and apparatus for automatically correcting the bending angle of a cutting blade.
  • a cutting blade is a strip-shaped member having a sharp edge at an upper portion thereof, and a body adapted to support the edge at a lower portion thereof.
  • Such a cutting blade is used in a state of being attached to a pattern. When a sheet material is laid on the pattern, and then downwardly pressed, it is cut to conform to the shape of the cutting blade. In such a manner, a variety of articles such as blanks of boxes, receipt sheets, and puzzle products can be manufactured.
  • U.S. Patent No. 5,461,893 to Tylor discloses a method for performing bending angle correction in an automatically-controlled manner using a computer.
  • this patent discloses only the general procedure without describing any concrete process.
  • the method disclosed in this patent uses a method of picking up, by a camera, an image indicative of the shape of a cutting blade obtained after being completely subjected to a bending process, and comparing the picked-up image with an image of the final product previously stored in a computer in order to increase or decrease the drive force required for the bending of the cutting blade based on the result of the comparison.
  • this method is complex while involving a number of errors, similarly to a manual correction method.
  • Another object of the invention is to provide a method for automatically correcting the bending angle of a cutting blade, which is capable of accurately controlling the feeding amount of the cutting blade having an accurately-corrected bending angle.
  • a method for automatically correcting a bending angle of a cutting blade comprising the steps of: (1) bending the cutting blade, based on basic bending data stored in a memory; (2) picking up a profile of the cutting blade bent based on the basic bending data, and transmitting the picked-up profile to a computer; (3) measuring an actual bending angle based on the profile of the bent cutting blade; (4) deriving a difference between an ideal bending angle and the actual bending angle; and (5) correcting the basic bending data stored in the memory based on the derived difference.
  • Fig. 3 a illustrates a bending data table for linear bending processes stored in the memory of a computer control unit in accordance with the present invention
  • Fig. 3b is a conceptual plan view illustrating an error generated in a primary bending process for forming a right-angled bent portion
  • Fig. 3 c is a conceptual plan view illustrating an error generated in a secondary bending process for forming a right-angled bent portion
  • Fig. 3d is a conceptual plan view illustrating a method for standardizing a profile of a bent cutting blade with reference to a central line
  • Fig. 4a illustrates an angle data table for bending processes adapted to form an arc-shaped bent portion, the table being stored in the memory of the computer control unit in accordance with the present invention
  • Fig. 4b illustrates an equal-division data table for bending processes adapted to form an arc-shaped bent portion, the table being stored in the memory of the computer control unit in accordance with the present invention
  • Fig. 4c is a conceptual plan view illustrating an error generated in a primary bending process for forming an arc-shaped bent portion
  • Fig. 4d is a conceptual plan view illustrating an error generated in a secondary bending process for forming an arc-shaped bent portion
  • Fig. 5 a is a plan view illustrating the profile of a cutting blade ideally bent to have a right-angled structure
  • Fig. 5b is a plan view illustrating the case in which the cutting blade is fed by a feeding length calculated taking into consideration an elongation amount of the cutting blade;
  • Fig. 5 c is a plan view for explaining a correction amount required for formation of a second portion of the cutting blade;
  • Fig. 5d illustrates a leading length correction table for linear bending processes stored in the memory of the computer control unit in accordance with the present invention;
  • Fig. 5e illustrates a trailing length correction table for linear bending processes stored in the memory of the computer control unit in accordance with the present invention.
  • Fig. 6 illustrates a feeding length correction table for bending processes adapted to form an arc-shaped bent portion, the table being stored in the memory of the computer control unit in accordance with the present invention.
  • Bending angle data corresponding to each of various cutting blade bending angles is stored in the memory of the computer control unit 10.
  • the computer control unit 10 reads out an angle by which the cutting blade is to be bent, and externally sends a command for rotating the bending member 300 based on the read-out data (S10).
  • the cutting blade bending machine is controlled to rotate the bending member 300 by a desired angle corresponding to the read-out data in accordance with operations of a servo motor, pulleys, and a rotating member supporting the bending member (SI 1).
  • the image detecting unit 20 picks up a planar profile of the cutting blade obtained after being completely subjected to a bending process by the bending member 300, images the picked-up profile, and sends the resultant image file to the computer control unit 10 (S12).
  • the computer control unit 10 measures an actual bending angle, based on the image file received thereto (SI 3). Thereafter, the computer control unit 10 determines whether or not the measured actual bending angle corresponds to the desired bending angle (S14).
  • the desired bending angle at this step is identical to the initial read-out bending angle data. When the actual bending angle corresponds to the desired bending angle, this desired bending angle is fixed as bending data.
  • the bending data should be corrected, based on correction data derived in accordance with a difference between the actual bending angle and the desired bending angle (SI 5).
  • the processing steps SIO to SI 4 are repeatedly executed to determine again whether or not the re-measured actual bending angle corresponds to the desired bending angle.
  • a satisfactory result is obtained when these processes are repeated three times or less.
  • the critical range of the bending angle to be used at step S14 be set in such a manner that the set bending angle is determined as satisfying the given forming condition when the angle difference is, for example, about 0.5°.
  • bending data values are sequentially updated in a manner as described above.
  • the updated bending data values are then automatically and correctly written in respective corresponding boxes of the bending data table.
  • These data values are used as optimum bending data meeting diverse thicknesses, heights, and physical properties of cutting blades to be bent, respectively. Accordingly, it is possible to bend the cutting blade with a correct and accurate bending angle.
  • Figs. 3a to 3d illustrate an example of the bending method where the desired bending angle is 90°.
  • Fig. 3a shows a bending data table 30 stored in the memory of the computer control unit 10.
  • the bending member 300 is controlled to rotate 90 ° (SI 1). Thereafter, the image detecting unit 20 sends, to the computer control unit 10, an image file produced by picking up the planar profile of the cutting blade obtained after being completely subjected to a bending process, and imaging the picked-up profile (S12). The computer control unit 10 measures an actual bending angle, based on the image file received thereto (SI 3).
  • the procedure of step S13 will be described in more detail.
  • the image transmitted from the image detecting unit 20, which represents an actual planar shape of the cutting blade, as shown in Fig. 3d, has a thickness and a width which may be variably determined.
  • the computer control unit of the present invention defines a central line of the width (indicated by a double-dotted line), and measures an actual bending angle with reference to the central line. For the automation and standardization of bending processes, it is important to determine the correction angle amount and feeding amount of a workpiece with reference to the central line of the width of the workpiece, and to measure data of diverse shapes of the workpiece with reference to the central line, thereby building a database having a broader application.
  • the computer control unit 10 determines at step S14 whether or not the measured actual bending angle corresponds to the desired bending angle, that is, 90°.
  • the desired angle is fixed as bending data.
  • a routine for calculating the difference between the actual bending angle and 90° that is, step SI 5 is executed. Where the cutting blade is bent by an angle of 90°, it is difficult, after only one bending process, to obtain the result in which the actual bending angle corresponds to the desired bending angle.
  • step S15 This is due to errors caused by a spring back phenomenon, in addition to general reasons such as frictional forces or inertial forces generated due to the use of a motor or gears.
  • the spring back phenomenon is caused by the tendency of the cutting blade to return to its original state by virtue of the plasticity of the cutting blade incompletely removed in the bending (forming) process. For this reason, in most cases, although the bending member bends the cutting blade as it rotates 90°, the actual bending angle of the cutting blade does not reach 90° after one bending process because the cutting blade springs back in a small amount in a direction opposite to the original bending direction.
  • the difference calculating routine of step S15 will be described in more detail. Where the actual bending angle measured on the basis of the reference line is 75°, as shown in Fig.
  • This value "x" is temporarily written in a box of the table 30 corresponding to 90°.
  • the bending process is carried out again by repeating the procedure of steps S10 to S13. Subsequently, it is determined again at step S14 whether or not the actual bending angle corresponds to the desired bending angle, that is, 90°. In most cases, however, the actual bending angle obtained after the secondary bending process exceeds a desired bending angle, due to the following reasons.
  • the angle of 80° is referred to as a critical angle. Since the correction value obtained after the primary bending process is a value calculated taking into consideration a certain parameter, that is, the error caused by spring back, the bending carried out in a correction angle range exceeding the critical angle (the correction angle range corresponds to a range of 80 to 108° when the critical angle is 80°) is considered as being made taken into consideration the factor of "spring back". As a result, the bending angle obtained after the secondary bending process slightly exceeds a desired bending angle.
  • step SI 5 desired correction data is applied to the difference calculating routine of step SI 5.
  • step S14 it is determined again at step S14 whether or not the actual bending angle corresponds to 90°.
  • the correction angle is fixed as basic data.
  • the routine of step SIO and steps following step SIO is further repeated until the actual bending angle accurately corresponds to a desired bending angle.
  • the above example is associated with the case in which the primary actual angle is less than the critical angle.
  • the actual angle measured after the primary bending process is more than the critical angle (for example, in the case of 85°)
  • the above described method is based on the principle of deriving an estimated bending angle at a primary correction step, and increasing or reducing the difference of the estimated bending angle from a desired bending angle at a secondary correction step, thereby gradually tracing an accurate bending angle. Accordingly, it can be understood that this method is generally applicable to optional linear bending processes in which the actual angle measured after a primary bending procedure exceeds a critical angle.
  • the basic principle of the arc-forming bending process is to bend the cutting blade A to have a polygonal shape approximating a desired arc shape by repeatedly striking the cutting blade A while advancing the cutting blade A by a predetermined length after every striking, thereby bending the cutting blade A by a predetermined angle after every striking.
  • it is necessary to calculate the arc length of the arc based on the radius R and arc angle of the arc. In accordance with the calculated arc length and a predetermined number of bending times, the feeding length of the cutting blade A required for every bending time is automatically determined.
  • the arc angle set in the computer control unit 10 and the count value of Fig. 4b are freely variable because they are inputted by the user (A higher arc-forming accuracy is obtained at a higher count value.).
  • the feeding amount of the cutting blade is reduced by 1/2. In this case, it may be unnecessary to vary the count value.
  • the leftmost column 41 and uppermost row 42 of an angle data table shown in Fig. 4a have the same meanings as those of the equal-division data table shown in Fig. 4b.
  • the angle data described in each box where the leftmost column 41 crosses the uppermost row 42 represents the rotating angle of the bending member in the arc-forming bending process.
  • "6.43" described in the box 43 represents the angle by which the bending member should rotate for each of 28 bending times (At each bending time, the cutting blade advances about 1.12 mm.) in order to form an arc having a radius R of 10 mm and an arc angle of 180°.
  • the data value of "6.96" derived in the above calculation is written in the box 43 of the table 40 as corrected data.
  • the • process for rotating the bending member by an angle of 6.96° is repeated 28 times.
  • Fig. 4d shows an error generated when a secondary bending process is carried out, based on the data of "6.96” and "28.00” derived as described above.
  • the actual bending angle of the cutting blade obtained after the bending process is 200°, which is more than a desired bending angle of 180°.
  • the bending data is adjusted using a desired angle increase "x".
  • the value "x" of "0.22" derived as described above is added to the original data value "6.43".
  • the derived data of "6.65" is bending angle data obtained after the secondary correction. The above described routine is then repeated.
  • Fig. 5 a is a plan view illustrating an ideal cutting blade bent to have a right-angled structure having two portions 61 and 62 each having a length of 10 mm.
  • the length measurement is carried out with reference to the central line of the width.
  • the cutting blade A is fed by a length (10 mm) corresponding to the length of the portion 61, and then bent in accordance with rotation of the bending member, thereby forming the portion 61. Thereafter, the cutting blade A is fed again by a length (10 mm) corresponding to the portion 62, and then cut using a cutting device (not shown).
  • a bent cutting blade product is obtained. This is an ideal bending process. However, when the cutting blade is bent, it is longitudinally elongated at its bending portion.
  • the practical bending process is carried out under the condition in which the cutting blade is fed by a length less than the ideal length (10 mm) for forming the portion 61.
  • Data for this bending process is provided by a leading length correction table illustrated in Fig. 5d.
  • data "0.28" described in the table of Fig. 5d in association with a bending angle of 90° is a value deducted from the ideal length (10 mm).
  • the practical feeding length of the cutting blade for forming the portion 61 corresponds to "9.72 mm" (Fig. 5b).
  • Fig. 6 is a table for correcting the feeding length of the cutting blade in the arc-forming bending process.
  • the above described feeding length correction table is read out by the computer control unit 10 in a process for feeding the cutting blade before the process for practically bending the cutting blade.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

L'invention porte sur un procédé de correction automatique de l'angle de courbure d'une lame comportant les étapes suivantes: (1) détermination de la courbure de la lame en fonction de données stockées dans la mémoire d'une machine à courber les lames; (2) extraction du profil de courbure de la lame fonction des données de base, et transmission dudit profil à la commande informatisée, et (3) lecture du profil transmis dont on tire l'angle réel de courbure. Ce procédé permet d'obtenir avec précision les données requises pour réaliser soit un processus de courbure linéaire, soit un processus de courbure en arc.
PCT/KR2003/000288 2003-02-11 2003-02-11 Procede et appareil de correction automatique de l'angle de courbure d'une lame WO2004071687A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/KR2003/000288 WO2004071687A1 (fr) 2003-02-11 2003-02-11 Procede et appareil de correction automatique de l'angle de courbure d'une lame

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2003/000288 WO2004071687A1 (fr) 2003-02-11 2003-02-11 Procede et appareil de correction automatique de l'angle de courbure d'une lame

Publications (1)

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WO2004071687A1 true WO2004071687A1 (fr) 2004-08-26

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112453132A (zh) * 2019-09-09 2021-03-09 河南森源重工有限公司 一种u型臂体折弯控制方法及装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4627255A (en) * 1983-02-12 1986-12-09 Usm Corporation Apparatus for bending metal strip
JPH02280920A (ja) * 1989-04-20 1990-11-16 Amada Co Ltd 折曲げ加工機の曲げ角度補正装置
DE4312565A1 (de) * 1993-04-17 1994-10-20 Manfred Prof Dr Ing Geiger Biegemaschine zum Biegen flächiger Werkstücke
US5461893A (en) * 1993-05-28 1995-10-31 Cnc Corporation Method and apparatus for bending steel rule

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4627255A (en) * 1983-02-12 1986-12-09 Usm Corporation Apparatus for bending metal strip
JPH02280920A (ja) * 1989-04-20 1990-11-16 Amada Co Ltd 折曲げ加工機の曲げ角度補正装置
DE4312565A1 (de) * 1993-04-17 1994-10-20 Manfred Prof Dr Ing Geiger Biegemaschine zum Biegen flächiger Werkstücke
US5461893A (en) * 1993-05-28 1995-10-31 Cnc Corporation Method and apparatus for bending steel rule

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112453132A (zh) * 2019-09-09 2021-03-09 河南森源重工有限公司 一种u型臂体折弯控制方法及装置
CN112453132B (zh) * 2019-09-09 2022-10-14 河南森源重工有限公司 一种u型臂体折弯控制方法及装置

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