EP0110263A2 - Méthode pour chanfreiner le bord d'une fente courbe - Google Patents

Méthode pour chanfreiner le bord d'une fente courbe Download PDF

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Publication number
EP0110263A2
EP0110263A2 EP83111557A EP83111557A EP0110263A2 EP 0110263 A2 EP0110263 A2 EP 0110263A2 EP 83111557 A EP83111557 A EP 83111557A EP 83111557 A EP83111557 A EP 83111557A EP 0110263 A2 EP0110263 A2 EP 0110263A2
Authority
EP
European Patent Office
Prior art keywords
slot
backup plate
corner
grinding belt
slotted member
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.)
Granted
Application number
EP83111557A
Other languages
German (de)
English (en)
Other versions
EP0110263B1 (fr
EP0110263A3 (en
Inventor
Masaru Hamada
Mitsutoshi Tsutsumi
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.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
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 Toyota Motor Corp filed Critical Toyota Motor Corp
Publication of EP0110263A2 publication Critical patent/EP0110263A2/fr
Publication of EP0110263A3 publication Critical patent/EP0110263A3/en
Application granted granted Critical
Publication of EP0110263B1 publication Critical patent/EP0110263B1/fr
Expired 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
    • 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
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/002—Machines or devices using grinding or polishing belts; Accessories therefor for grinding edges or bevels
    • 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
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/16—Machines or devices using grinding or polishing belts; Accessories therefor for grinding other surfaces of particular shape

Definitions

  • the present invention relates to a method by belt-grinding of chamfering a curved slot corner formed by a front surface of a slotted member and a longitudinally curved surface of said slotted member defining a slot.
  • Chamfering of a straight slot corner which is formed by a front-surface of a slotted member and a longitudinally straight surface of said slotted member defining a slot is usually executed as follows. First, the slotted member is held between an upper holder and a lower holder. Next, a backup plate whose upper surface is flat is placed in a slot formed in the slotted member and a grinding belt is applied to the upper surface of the backup plate so as to travel in the slot. Then, by relatively shifting the upper holder and the lower holder in position so that the slotted member may be tilted, the backup plate is pushed toward the straight slot corner to be chamfered by a slot corner which is diagonally opposed to said straight slot corner to be chamfered. The grinding belt which is running is pressed by the backup plate against the straight slot corner to be chamfered and the chamfering of said straight slot corner is executed.
  • the chamfer width is liable to vary in the longitudinal direction of the slot, when the slot corner is curved in the longitudinal direction of the slot and for this reason, this method of chamfering has been inapplicable to the chamfering of a curved slot corner.
  • An object of the present invention is to provide a method for chamfering a longitudinally curved slot corner formed by a front surface of a slotted member and a longitudinally curved surface of said slotted member defining a slot.
  • the chamfering method for a curved slot corner according to the present invention comprises the following steps.
  • the first step is to hold the upper end and the lower end of the slotted member with an upper holder and a lower holder respectively.
  • the second step is to place in a slot of the slotted member a backup plate whose upper surface is curved in a plane normal to the longitudinal direction of the backup plate.
  • the third step is to apply a flexible grinding belt to the upper surface of the backup plate so as to let the grinding belt travel in the slot.
  • the fourth step is to make said upper holder and lower holder shift relative to each other, thereby tilting the slotted member, and push said backup plate toward a longitudinally curved slot corner to be chamfered by a longitudinally straight slot corner diagonally opposed to said longitudinally curved slot corner, and then press the grinding belt which is running against the longitudinally curved slot corner to be chamfered by said backup plate, thereby executing the chamfering of said longitudinally curved slot corner.
  • the grinding belt since the upper surface of the backup plate is curved, the grinding belt, following the curvature of said backup plate, can grind the longitudinally curved slot corner of the slotted member. Thus it is made possible to chamfer a longitudinally curved slot corner, which has been impossible in the conventional method executed by using a flat backup plate.
  • the chamfer angle and the width of the chamfer in the longitudinal direction of the slot can be arbitrarily selected.
  • Figures 1 and 2 illustrate a slotted member before chamfered by the method of the present invention.
  • Figures 3 and 4 illustrate the same slotted member after chamfered by the method of the present invention.
  • the slotted member 1 constitutes of a plate with a slot 2.
  • the slot 2 extends from one side la of the slotted member 1 toward the other side 1b of the member 1 and it is open at said one side.la.
  • the slot 2 penetrates from the front surface lc to the back surface 1d of the slotted member 1 in the thickness direction of the member 1.
  • one side surface 2a is curved in the longitudinal direction of the slot, while the other side surface 2b is flat and longitudinally straight.
  • the side surface 2a is continuous to the bottom surface 2c of the slot 2 and the bottom surface 2c is continuous to the side surface 2b.
  • the side surface 2a consists of a cylindrical surface with a radius R which is convex toward the side surface 2b.
  • the longitudinally curved slot corner 3 which is formed by the longitudinally curved side surface 2a of the slot 2 and the front surface la of the slotted member 1 is a corner to be chamfered.
  • FIGS 5 to 9 illustrate the process of chamfering according to the present invention.
  • first a plurality of slotted members 1 with slots 2 are held between the upper holder 5 and the lower holder 6.
  • the upper holder 5 has a plurality of grooves 5a which are open downward, while the lower holder 6 has a plurality of grooves 6a which are open upward.
  • the slotted members 1 have their top ends held in the grooves 5a of the upper holder 5 and their bottom ends held in the grooves 6a of the lower holder 6.
  • the upper holder 5 and the lower holder 6 can be shifted in position relative to each other with parallelness maintained. By this positional shifting, the slotted members 1 are tilted from vertical position.
  • a backup plate 8 is placed so that it may partly be placed in every slot 2 of the slotted members 1.
  • the upper surface 8a of the backup plate 8a that is, the belt-contacting surface 8a of the backup plate 8 is curved within every plane normal to the longitudinal direction of the backup plate 8, while the back surface 8b of the backup plate 8 is flat and straight within every plane normal to the longitudinal direction of the backup plate 8.
  • a grinding belt 7 is applied to the upper surface of the backup plate 8 so as to travel in every slot 2 of the slotted members 1.
  • the grinding belt 7 is flexible and it is made of, e.g., a non-woven textile with one side coated with abrasive grains.
  • the grinding belt 7, as seen from Fig. 8, is an endless belt.
  • the backup plate 8 is pushed toward the longitudinally curved slot corner 3 to be chamfered at the back surface 8b thereof by a longitudinally straight slot corner 3' diagonally opposed, in the slot cross section, to said longitudinally curved slot corner 3 to be chamfered. Since the side surface 2b of the slot 2 is longitudinally straight and the back surface 8b of the backup plate 8 is also straight in every plane normal to the longitudinal direction of said backup plate 8, in the process of chamfering, the back surface 8b of the backup plate 8 is brought into contact with the whole length of the longitudinally straight corner 3' diagonally opposed to the longitudinally curved slot corner 3.
  • the backup plate 8 presses the grinding belt 7, with which it is in contact, against the longitudinally curved slot corner 3 to be chamfered.
  • the longitudinally curved slot corner 3 can be chamfered by the running grinding belt 7.
  • the grinding belt 7 travels in the direction from the front surfaces 1c of the slotted members 1 toward the back surfaces 1d of the members 1.
  • the grinding belt 7 since the grinding belt 7 is flexible, it can curve itself following the profile of the curved upper surface 8a of the backup plate 8 and thus well fitting the longitudinally curved slot corner 3 to be chamfered, the grinding belt 7 can form a successful chamfer 4 at the corner 3. In this manner, chamfering of a longitudinally curved slot corner which has been impossible by the conventional chamfering method is rendered possible.
  • the upper surface 8a of the backup plate 8 contacting with the grinding belt 7 is designed such that its profile within every plane normal to the longitudinal direction of the backup plate 8 is the same as the profile of the projection 9 ( see Fig. 11 ) of the longitudinally curved slot corner 3 onto a plane A normal to the longitudinal direction of the grinding belt 7 when the slotted members 1 are tilted by a chamfer angle o, that is, the angle of the surface of the chamfer 4 against the longitudinally curved slot surface 2a.
  • Such a profile of the upper surface 8a of the backup plate 8 makes the width of the chamfer 4 uniform over the entire longitudinal length of the longitudinally curved slot corner 3.
  • the profile of the upper surface 8a of the backup plate 8 may differ from that of said projection 9, but in such a case, the width of the chamfer 4 will vary in the longitudinal direction of the longitudinally curved slot corner 3.
  • the thickness t of the backup plate 8 is in the following relationship with the desired chamfer angle ⁇ , the width W of the slot 2, the thickness t' of the grinding belt 7 and the thickness T of the member 1:
  • one slotted member 1 or a plurality of slotted members 1 may be held between the upper holder 5 and the lower holder 6.
  • the chamfering efficiency can be increased, because a plurality of members 1 can be chamfered in a single chamfering work.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
EP19830111557 1982-11-20 1983-11-18 Méthode pour chanfreiner le bord d'une fente courbe Expired EP0110263B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP203991/82 1982-11-20
JP20399182A JPS5997833A (ja) 1982-11-20 1982-11-20 溝角部の面取り加工方法

Publications (3)

Publication Number Publication Date
EP0110263A2 true EP0110263A2 (fr) 1984-06-13
EP0110263A3 EP0110263A3 (en) 1985-05-08
EP0110263B1 EP0110263B1 (fr) 1988-03-09

Family

ID=16482965

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830111557 Expired EP0110263B1 (fr) 1982-11-20 1983-11-18 Méthode pour chanfreiner le bord d'une fente courbe

Country Status (3)

Country Link
EP (1) EP0110263B1 (fr)
JP (1) JPS5997833A (fr)
DE (1) DE3375884D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1366855A1 (fr) * 2002-05-30 2003-12-03 JATCO Ltd Procédé et dispositif pour chanfreiner des plaques

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1771417A (en) * 1929-06-22 1930-07-29 Pittsburgh Plate Glass Co Machine for rounding the edges of sheets
US2402734A (en) * 1944-07-14 1946-06-25 John A Costelow Dressing machine
FR1477468A (fr) * 1964-12-09 1967-04-21 Rectifieuse pour profils spécialement destinée au travail du bois
GB2013116A (en) * 1978-01-31 1979-08-08 Volvo Car Bv Driving belt with transverse elements provided with curved belt-bearing surfaces

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1771417A (en) * 1929-06-22 1930-07-29 Pittsburgh Plate Glass Co Machine for rounding the edges of sheets
US2402734A (en) * 1944-07-14 1946-06-25 John A Costelow Dressing machine
FR1477468A (fr) * 1964-12-09 1967-04-21 Rectifieuse pour profils spécialement destinée au travail du bois
GB2013116A (en) * 1978-01-31 1979-08-08 Volvo Car Bv Driving belt with transverse elements provided with curved belt-bearing surfaces

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1366855A1 (fr) * 2002-05-30 2003-12-03 JATCO Ltd Procédé et dispositif pour chanfreiner des plaques
US7033255B2 (en) 2002-05-30 2006-04-25 Jatco Ltd Chamfer processing method and device for plate material

Also Published As

Publication number Publication date
JPS5997833A (ja) 1984-06-05
EP0110263B1 (fr) 1988-03-09
DE3375884D1 (en) 1988-04-14
EP0110263A3 (en) 1985-05-08

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