EP0110263B1 - Chamfering method for a curved slot corner - Google Patents

Chamfering method for a curved slot corner Download PDF

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Publication number
EP0110263B1
EP0110263B1 EP19830111557 EP83111557A EP0110263B1 EP 0110263 B1 EP0110263 B1 EP 0110263B1 EP 19830111557 EP19830111557 EP 19830111557 EP 83111557 A EP83111557 A EP 83111557A EP 0110263 B1 EP0110263 B1 EP 0110263B1
Authority
EP
European Patent Office
Prior art keywords
backup plate
slot
chamfering
workpiece
grinding belt
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
Application number
EP19830111557
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0110263A2 (en
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/en
Publication of EP0110263A3 publication Critical patent/EP0110263A3/en
Application granted granted Critical
Publication of EP0110263B1 publication Critical patent/EP0110263B1/en
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 for chamfering a curved edge portion of a workpiece according to the preamble of claim 1.
  • the US ⁇ A ⁇ 1 771 417 shows a method where the lower edge of workpieces having a curved shape is chamfered by a grinding belt travelling along a curved surface of a back-up plate.
  • the workpiece is held relatively loosely here between an upper holder gripping around its upper edge and a lower holder gripping around the lower portions of its lateral edges.
  • the pressure required for the chamfering operation is provided by the workpiece's own weight or by the upper holder's own weight, respectively.
  • the upper holder can be provided with an additional weight, or the back- up plate can be provided with a device pressing it against the workpiece.
  • the object of the invention is to so develop the method according to the preamble of claim 1 that it can be used in simple manner for workpieces with open slots.
  • the pressure required for the chamfering operation is obtained by exploiting the geometry of the workpiece in connection with a change in the positional relationship of the two holders. It can be carried out without additional weights or pressing devices even in cases where high pressures are required.
  • 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 workpiece before chamfered by the method of the present invention.
  • Figures 3 and 4 illustrate the same slotted workpiece after chamfered by the method of the present invention.
  • the slotted workpiece 1 constitutes of a plate with a slot 2.
  • the slot 2 extends from one side 1 a of the slotted workpiece 1 toward the other side 1 b of the workpiece 1 and it is open at said one side 1 a.
  • the slot 2 penetrates from the front surface 1c to the back surface 1d of the slotted workpiece 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 corner portion 3 which is formed by the longitudinally curved side surface 2a of the slot 2 and the front surface 1a 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 workpieces 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 workpieces 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 workpieces 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 workpieces 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 corner portion 3 to be chamfered at the back surface 8b thereof by a longitudinally straight corner portion 3' diagonally opposed, in the slot cross section, to said longitudinally curved corner portion 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 portion 3' diagonally opposed to the longitudinally curved corner portion 3.
  • the backup plate 8 presses the grinding belt 7, with which it is in contact, against the longitudinally curved corner portion 3 to be chamfered.
  • the longitudinally curved corner portion 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 workpieces 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 corner portion 3 to be chamfered, the grinding belt 7 can form a successful chamfer 4 at the corner portion 3. In this manner, chamfering of a longitudinally curved corner portion 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 corner portion 3 onto a plane A normal to the longitudinal direction of the grinding belt 7 when the slotted workpieces 1 are tilted by a chamfer angle 8, 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 corner portion 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 corner portion 3.
  • the thickness t of the backup plate 8 is in the following relationship with the desired chamfer angle 8, the width W of the slot 2, the thickness t' of the grinding belt 7 and the thickness T of the member 1: Therefore, the chamfer angle 8 is variable through adjusting the thickness of the backup plate 8. Accordingly the width of the chamfer 4 and the chamfer angle can be controlled.
  • one slotted workpiece 1 or a plurality of slotted workpieces 1 may be held between the upper holder 5 and the lower holder 6.
  • the chamfering efficiency can be increased, because a plurality of workpieces 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 Chamfering method for a curved slot corner Expired EP0110263B1 (en)

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

Family

ID=16482965

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830111557 Expired EP0110263B1 (en) 1982-11-20 1983-11-18 Chamfering method for a curved slot corner

Country Status (3)

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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3759473B2 (ja) * 2002-05-30 2006-03-22 ジヤトコ株式会社 板材の面取り加工方法及び装置

Family Cites Families (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
CH417386A (de) * 1964-12-09 1966-07-15 Hugo Schneider Modellschreiner Profilschleifmaschine, insbesondere für die Holzbearbeitung
NL168742C (nl) * 1978-01-31 1983-09-16 Volvo Car Bv Werkwijze voor het vormen van gewelfde drijfbandoplegvlakken op de dwarselementen van een transmissieband, alsmede schuurband voor het uitvoeren van deze werkwijze.

Also Published As

Publication number Publication date
JPS5997833A (ja) 1984-06-05
EP0110263A2 (en) 1984-06-13
DE3375884D1 (en) 1988-04-14
EP0110263A3 (en) 1985-05-08

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