EP0137859A2 - Verfahren zum Entgraten und Abfasen - Google Patents

Verfahren zum Entgraten und Abfasen Download PDF

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Publication number
EP0137859A2
EP0137859A2 EP83108687A EP83108687A EP0137859A2 EP 0137859 A2 EP0137859 A2 EP 0137859A2 EP 83108687 A EP83108687 A EP 83108687A EP 83108687 A EP83108687 A EP 83108687A EP 0137859 A2 EP0137859 A2 EP 0137859A2
Authority
EP
European Patent Office
Prior art keywords
workpiece
grinding
burring
grinding wheel
chamfering
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Withdrawn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
EP83108687A
Other languages
English (en)
French (fr)
Other versions
EP0137859A3 (de
Inventor
Tamio Takahashi
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to EP83108687A priority Critical patent/EP0137859A3/de
Publication of EP0137859A2 publication Critical patent/EP0137859A2/de
Publication of EP0137859A3 publication Critical patent/EP0137859A3/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/002—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor for travelling workpieces

Definitions

  • the present invention relates to a method of burring and chamfering a work, and more particularly, to a burring chamfering method suitable for use in uniformly burring and chamfering the surface of a piece of work carried on a conveyor by means of a plurality of grinding wheels.
  • the manufacture of such sheet metal products as produced through blanking or punching thin sheet materials has been increasing in scale every year.
  • the invention pertains to highly efficient machining techniques for removing burrs produced by such press working and for chamfering machined portions or cut surfaces of work pieces.
  • machining is used to mean a machining operation such as blanking or punching.
  • Burrs are unavoidably produced on cut or machined surfaces in the initial process of sheet metal working. A product with burrs not removed may injure people or cause other problems and therefore is variously harmful. In addition, if a machined portion is left having a 90-degree edge, the removal of only projecting burrs cannot completely eliminate the above-mentioned problems. Therefore, the machined edge portion must be subjected to chamfering (edge smoothing) simultaneously with burring.
  • the greater part of products subjected to sheet metal working have shapes as shown in Fig. 1, and are formed by blanking a steel plate having a rectangular outer periphery so as to have square machined portions parallel to the outer peripheral portion and circular machined portions or elliptical machined portions obtained by the combination of round and square machined portions.
  • Such an apparatus as shown in Fig. 2 has been conventionally employed for surface machining operations, such as burring and chamfering, for these workpieces after blanking.
  • This surface machining apparatus 1 is arranged such that a grinding wheel 4 for burring and chamfering the surface of a workpiece 2 is provided over a feed conveyor 3 for carrying the workpiece 2, and press rollers 5 for pressing down and feeding the workpiece 2 are disposed along and close to the front and rear sides of the grinding wheel 4, respectively, and moreover, the grinding wheel 4 is disposed so as to be at right angles to the moving direction of the feed conveyor 3 and is driven by means of a driver 6.
  • the invention provides a burring chamfering method wherein, with a square machined portion taken as an object to be burred and chamfered, the grinding wheel is obliquely disposed while having an angle of about 45 degrees with respect to the square portion, thereby to allow the machining effect of the rotation of the grinding wheel to act on all the four sides of the machined portion under the same conditions, and in addition, split-type rollers are arranged as rollers for pressing down and feeding the workpiece, thereby to permit even a small workpiece, from short to long in overall dimensions, to be machined.
  • the invention provides a burring chamfering method wherein, on a belt conveyor for carrying a workpiece, a first grinding wheel which has a grinding surface rotating in the direction opposite to the carrying direction and a second grinding wheel which is disposed in parallel to the first grinding wheel and has a grinding surface rotating in the same direction as the carrying direction are provided, and the workpiece is passed under these grinding wheels so as to be burred and-chamfered.
  • grinding wheels 4X and 4Y are disposed while having an inclination angle of about 45 degrees with respect to a belt conveyor 3 which carries a workpiece 2 from the inlet side to the outlet side.
  • split-type free-rotating press rollers 5X and 5Y which rotate in the same direction as the direction of the flow of the conveyor for holding the workpiece from being displaced as well as for feeding the workpiece in accordance with the flow of the conveyor are arranged on the front and rear sides of the grinding wheels 4X and 4Y, respectively.
  • each grinding wheel is adapted to apply to the workpiece a pressure most suitable for machining according to the thickness of the workpiece as well as apply a pressing force to the press rollers required for prevention of displacement of the workpiece due to machining.
  • the two grinding wheels can apply burring chamfering actions (e.g., machining forces applied in all direction) to the entire periphery sides (all four sides) of a machined portion to be ground.
  • the workpiece placed on the conveyor closer to the inlet side is subjected to a machining action when passing under the grinding wheels while being carried by the belt and the press rollers.
  • the workpiece is subjected to a displacing force in the tangential direction of each wheel. Since the pressing forces between the belt and the split-type free rollers 5X and 5Y rotating in the same direction as the flow of the conveyor are larger than the displacing force, the workpiece will not be displaced and passes under the grinding wheels at the same speed as the belt moving speed while being subjected to the machining actions.
  • the machined portion of the workpiece passing under both the grinding wheels has four sides thereof all subjected to machining under the same conditions.
  • the split-type free rollers are disposed along the sides of the wheels, hence, even a small workpiece can be machined.
  • the grinding wheels act while having an angle of about 45 degrees with respect to the flow of the workpiece, the machined portion passing under the grinding wheel rotating counterclockwise and the grinding wheel rotating clockwise is uniformly burred and chamfered.
  • the surface machining apparatus thus constructed, it is possible to obtain a substantially uniform degree of surface machining such as burring and chamfering, since all the cut sides and machined portion sides of the workpiece 2 are subjected to surface machining such as burring and chamfering by means of the rotation of the grinding wheels 4X and 4Y.
  • this surface machining apparatus some sides are subjected to a down-cutting action by the grinding wheel 4X having a grinding surface rotating in the same direction as the moving direction of the workpiece 2, while the other sides are subjected to an up-cutting action by the grinding wheel 4Y, while countering thereto, which has a grinding surface rotating in the direction opposite to the moving direction. Therefore, there is such a tendency that the latter is inevitably burred and chamfered more effectively than the former.
  • a reference numeral 7 denotes each of conveyor rollers, while 8 represents a conveyor plate.
  • the side 2a of the workpiece 2 is subjected to surface machining such as burring and chamfering by the grinding wheel 4X having the grinding surface rotating in the same direction as the moving direction of the conveyor 3 while moving away from the grinding wheel 4X in the moving direction of the conveyor 3.
  • the side 2c of the workpiece 2 is subjected to surface machining such as burring and chamfering with the grinding wheel 4X while countering thereto by means of the movement of the conveyor 3.
  • the side 2c of the workpiece 2 is more burred and chamfered than the side 2a, showing a tendency to cause a non-uniform burring and chamfering between both the sides 2a and 2c of the workpiece 2.
  • the cut sides 2A and 2D of the workpiece 2 also have the above tendency.
  • the grinding wheel 4X since the grinding wheel 4X first disposed with respect to the moving direction of the workpiece 2 machines a workpiece which has not been machined, while the second grinding wheel 4Y machines the workpiece which has been surface-machined once, the first grinding wheel 4X is larger in wear than the second grinding wheel 4Y. Accordingly, in the case where a multiplicity of grinding wheels 4 are disposed, the grinding wheels tend to become smaller in wear in the disposition order, i.e., they tend to have non-uniform wear.
  • Figs. 5 and 6 in combination show another example of the surface machining apparatus to which a further improved burring chamfering method in accordance with the invention is applied.
  • the surface machining apparatus shown in Figs. 5 and 6 differs from the above-described machining apparatus of the invention in that the number of revolutions of the grinding wheel 4X having the grinding surface rotating in the same direction as the moving direction of the conveyor 3 and that of the grinding wheel 4Y having the grinding surface rotating in the direction opposite to the moving direction are selected to be substantially equal to each other in relative to the workpiece 2. More specifically, the number of revolutions of the grinding wheel 4X is set so as to be increased by 2v (where v: the speed of the conveyor), and the number of revolutions of the grinding wheel 4X is selected to be in the vicinity of the set value.
  • the grinding wheels are rotated so that the speeds (peripheral speeds) V of the grinding surfaces of the respective grinding wheels in machining the workpiece 2 are substantially equal to each other in relation to the workpiece 2. It is to be noted that it is desirable to properly select the above revolution numbers according to the quality of material of the workpiece 2 and the wheels.
  • the number of revolutions of the grinding wheel 4X is made higher than that of the grinding wheel 4Y. More specifically, the speed of the grinding surface of the grinding wheel 4X is set to be faster than that of the grinding wheel 4Y by 2v.
  • the workpiece 2 passes under the grinding wheel 4X while subjecting its cut side 2C and machined portion side 2a to up-cutting actions, so that these portions are burred and chamfered.
  • the workpiece 2 passes under the grinding wheel 4Y while subjecting its cut side 2A and machined portion side 2c to up-cutting actions, so that these portions are burred and chamfered.
  • the relative speed of the grinding surface of the grinding wheel 4X is made equal to that of the grinding wheel 4Y with respect to the workpiece 2, it is possible to make uniform the degree of surface machining such as burring and chamfering of the cut sides 2A, 2C which are at right angles to the moving direction of the workpiece 2, and the machined portion sides 2a, 2c which are parallel to the moving direction.
  • the degree of surface machining of 2B, 2D, 2b, 2c is also just the same as the above-mentioned sides.
  • Such a burring chamfering method is made more effective by applying axial vibrations to the grinding wheels 4X and 4Y as follows:
  • Figs. 7a and 7b are front views for explaining a method of making uniform the wear of the grinding wheels 4X and 4Y.
  • the grinding wheel 4X which is first disposed with respect to the moving direction of the workpiece 2 has greater wear than the second grinding wheel 4Y. Therefore, in this apparatus, the belt conveyor is not driven in a fixed moving direction at all times, but the moving direction of the conveyor 3 is changed every time a predetermined time elapses, as shown in Figs. 7a and 7b. By so doing, the wear of the grinding wheels 4 can be made uniform.
  • Such a method is extremely effective in the case where two or more of the grinding wheels 4 are employed.
  • the speed of the grinding surface of the grinding wheel rotating in the same direction as the moving direction of the workpiece and that of the grinding surface of the grinding wheel rotating in the direction opposite to the moving direction are made equal to each other in relation to the workpiece to effect burring and chamfering. Therefore, the workpiece can be uniformly burred and chamfered advantageously.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
EP83108687A 1983-09-02 1983-09-02 Verfahren zum Entgraten und Abfasen Withdrawn EP0137859A3 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP83108687A EP0137859A3 (de) 1983-09-02 1983-09-02 Verfahren zum Entgraten und Abfasen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP83108687A EP0137859A3 (de) 1983-09-02 1983-09-02 Verfahren zum Entgraten und Abfasen

Publications (2)

Publication Number Publication Date
EP0137859A2 true EP0137859A2 (de) 1985-04-24
EP0137859A3 EP0137859A3 (de) 1985-06-05

Family

ID=8190659

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83108687A Withdrawn EP0137859A3 (de) 1983-09-02 1983-09-02 Verfahren zum Entgraten und Abfasen

Country Status (1)

Country Link
EP (1) EP0137859A3 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2586953A1 (fr) * 1985-09-10 1987-03-13 Elan Machine automatique pour ebavurer des pieces de petites dimensions
WO1993023202A1 (en) * 1992-05-14 1993-11-25 Bodilsen Hodling A/S Apparatus for the buffing of edges on an elongated item
EP0673714A1 (de) * 1994-03-22 1995-09-27 Framatome Verfahren und Vorrichtung zum Entgraten und Anfasen des Randbereiches von Bohrungen durch eine Halterungsplatte für ein Rohrbündel

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6408273A (de) * 1964-07-20 1966-01-21
GB1461570A (en) * 1973-04-13 1977-01-13 Hawker Siddeley Aviation Ltd Deburring of workpieces
US4078905A (en) * 1976-12-03 1978-03-14 Mitsubishi Jukogyo Kabushiki Kaisha Edge-rounding method and apparatus therefor
DE3232884A1 (de) * 1981-09-25 1983-04-14 Avco Corp., 06830 Greenwich, Conn. Vorrichtung zum entgraten

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2586953A1 (fr) * 1985-09-10 1987-03-13 Elan Machine automatique pour ebavurer des pieces de petites dimensions
WO1993023202A1 (en) * 1992-05-14 1993-11-25 Bodilsen Hodling A/S Apparatus for the buffing of edges on an elongated item
EP0673714A1 (de) * 1994-03-22 1995-09-27 Framatome Verfahren und Vorrichtung zum Entgraten und Anfasen des Randbereiches von Bohrungen durch eine Halterungsplatte für ein Rohrbündel
FR2717726A1 (fr) * 1994-03-22 1995-09-29 Framatome Sa Procédé et dispositif d'ébavurage et de chanfreinage de bords de trous traversant une plaque de maintien d'un faisceau de tubes.
US5683287A (en) * 1994-03-22 1997-11-04 Framatome Process and device for deburring and chamfering edges of openings extending through a plate maintaining a bundle of tubes

Also Published As

Publication number Publication date
EP0137859A3 (de) 1985-06-05

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Inventor name: TAKAHASHI, TAMIO