EP0674971B1 - Procédé d'usinage d'une pièce - Google Patents

Procédé d'usinage d'une pièce Download PDF

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Publication number
EP0674971B1
EP0674971B1 EP19950301920 EP95301920A EP0674971B1 EP 0674971 B1 EP0674971 B1 EP 0674971B1 EP 19950301920 EP19950301920 EP 19950301920 EP 95301920 A EP95301920 A EP 95301920A EP 0674971 B1 EP0674971 B1 EP 0674971B1
Authority
EP
European Patent Office
Prior art keywords
workpiece
stem
head
valve
grinding
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
EP19950301920
Other languages
German (de)
English (en)
Other versions
EP0674971A1 (fr
Inventor
Katsuhiko C/O Fuji Oozx Inc. Harada
Michio C/O Fuji Oozx Inc. Araki
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.)
Fuji Oozx Inc
Original Assignee
Fuji Oozx Inc
Fuji Valve Co 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
Priority claimed from JP27084094A external-priority patent/JPH07314300A/ja
Priority claimed from JP6300715A external-priority patent/JPH08155747A/ja
Application filed by Fuji Oozx Inc, Fuji Valve Co Ltd filed Critical Fuji Oozx Inc
Publication of EP0674971A1 publication Critical patent/EP0674971A1/fr
Application granted granted Critical
Publication of EP0674971B1 publication Critical patent/EP0674971B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/18—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centreless means for supporting, guiding, floating or rotating work
    • B24B5/28—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centreless means for supporting, guiding, floating or rotating work for grinding outer surfaces concentrically to bores, involving additional centering means
    • 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
    • B24B15/00—Machines or devices designed for grinding seat surfaces; Accessories therefor
    • B24B15/04—Machines or devices designed for grinding seat surfaces; Accessories therefor on valve members

Definitions

  • the present invention relates to a method of processing a workpiece to make a poppe-t valve such as an engine valve used in an internal combustion engine.
  • Material is molded by forging to make a workpiece which comprises a larger diameter head and a stem, and a poppet valve such as an engine valve is manufactured through various mechanical processing steps, which include cutting the end of the stem; grinding the outer circumferential surface of the stem; chamfering the end of the stem; cutting a cotter groove; and grinding a head.
  • a poppet valve such as an engine valve
  • the end of the stem is cut to define the total length of the forged workpiece, and then, the outer circumferential surface of the stem is ground.
  • the rotary shafts of the rotating grinding and adjusting wheels are not in parallel, so that thrust force is applied to the workpiece in grinding in a direction of retracting direction, while the outer circumferential surface of the stem is ground such that the head is projected between the grinding and adjusting wheels, so that the end of the workpiece is engaged with a stopper between the grinding and adjusting wheels and is thus positioned.
  • the ground range is determined between the engaged end and the front end of the grinding wheel.
  • the length of the stem is different as forged material (at largest about 5 cm is variable in the total length of 10 cm)
  • the ground range is determined from the engaged end, the distance is variable between the head and the ground portion. So, prior to grinding, the stem must be cut to determine the total length of the workpiece.
  • forged material is rotatably supported by a plurality of support rollers, and the end face of the head is engaged with a loader head and positioned.
  • the workpiece itself is rotated, and the stem of the workpiece is cut by a rotating grindstone.
  • black skin of the forged material is stuck on the outer circumferential surface of the support roller, thereby causing unsmooth rotation of the support rollers or workpiece, and increasing wear of the outer circumferential surface of the support roller.
  • the black skin is formed by a mold releasing agent which is burnt on the material during hot forging.
  • the stem which has bending or warping is supported by the support roller, and a little deviation occurs in the total length, thereby decreasing accuracy in the ground range when the stem is ground.
  • FR-A-979,744 discloses a method of processing a workpiece having a larger diameter head and stem, by grinding the outer circumference of the stem followed by cutting the stem to a certain distance from an end of the head.
  • a stem 1a is put between grinding and adjusting wheels 2 and 3 of a centerless grinder as shown in a left portion of Fig. 1 and Fig. 2.
  • the workpiece 1 to be processed is put on a workpiece support plate, and the space is reduced, so that the stem 1a of the workpiece 1 is put between the grinding and adjusting wheels 2 and 3.
  • the grinding wheel 2 is rotated at high speed by a first motor 4 via a first rotary shaft 5.
  • the adjusting wheel 3 is rotated by a second motor 6 via a second rotary shaft 7 in the same direction as that of the grinding wheel 2 at speed lower than that of the grinding wheel 2, so that the workpiece 1 is rotated in a direction opposite to the grinding wheel 2 on the workpiece support plate, thereby grinding the outer circumferential surface of the stem 1a.
  • a head 1b which has diameter larger than the stem 1a is provided at one end of the stem 1a of the workpiece 1 and is projected forward on the grinding and adjusting wheels 2 and 3 as shown in Figs. 1 and 2.
  • the end face of the head 1b is engaged with a loader head 8 as a stopper
  • the rear end face of the stem 1a is engaged with a pusher 9 which is inserted between the grinding and adjusting wheels 2 and 3
  • the loader head 8 comprises a support shaft 8a and a bottom-having cylindrical head 8b which is connected to the end of the shaft 8a by a spherical bearing(not shown) rotatably and somewhat shakably.
  • the outer circumferential surface of the stem 1a is thus ground. Even if there is variation in length of the stem 1a or even if rearward thrust force is given to the workpiece 1, the workpiece 1 is ground at backward portion at a certain distance from the end face of the head 1b.
  • the rotary shaft 7 of the adjusting wheel 3 is inclined upward in a front direction with respect to the rotary shaft 5 of the grinding wheel 2, so that rearward thrust force is applied to the workpiece 1. Therefore, forward pressing force to the workpiece 1 by the pusher 9 must be larger than the thrust force. But, the rotary shaft 7 is slightly inclined downward in a forward direction, so that forward thrust force is applied to the workpiece, which is pressed towards the loader head 8 by the thrust force, so that pressing force to the workpiece 1 by the pusher 9 may be relatively small.
  • the workpiece 1 is placed between two driving rollers 10a, 10a and two driven rollers 10b, 10b as support rollers 10.
  • a driving shaft 11 through the two driving rollers 10a, 10a is rotatably supported by an intermediate bearing, and is driven by a motor 13 via driving and driven gears 14 and 15.
  • the two driven rollers 10b, 10b are arranged against the driving rollers 10a, 10a, and a rotary shaft 11 is rotatably supported by an intermediate bearing 12.
  • the axis of the driving shaft 11 of the driving roller 10a is horizontal, while the axis of the rotary shaft 16 of the driven roller 10b is slightly inclined upward in a front direction. (The lower parts in Figs. 1 and 3 are front.)
  • the end of the head 1b of the workpiece 1 is engaged on a loader head 18 having a shaft 18a and a head 18b, similar to the loader head 8 in Fig. 2.
  • a loader head 18 having a shaft 18a and a head 18b, similar to the loader head 8 in Fig. 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)

Claims (1)

  1. Procédé de fabrication d'une soupape à champignon (1) comportant une tige de soupape (1a) et une tête de soupape (1b), le procédé comportant les étapes consistant à :
    polir une surface circonférentielle extérieure de la tige de soupape (1a) pendant que l'extrémité de la tête de soupape (1b) est engagée dans un premier dispositif de retenue (8) pour positionner la soupape à champignon (1); et
    couper la tige de soupape (1a) à une distance prédéterminée de l'extrémité de la tête de soupape (1b) pendant que la surface circonférentielle extérieure d'une zone de base de la tige de soupape (1a) est supportée par plusieurs rouleaux supports (10a, 10b), la face d'extrémité de la tête de soupape (1b) étant engagée dans un second dispositif de retenue (18), dans lequel
       une tige pivotante (16) de l'un (10b) des rouleaux supports est légèrement inclinée de façon que la soupape à champignon (1) est pressée sur le second dispositif de retenue (18), permettant ainsi de toujours couper la tige de soupape (1a) à une position prédéterminée pour garder la longueur totale de la soupape à champignon (1) égale.
EP19950301920 1994-03-30 1995-03-22 Procédé d'usinage d'une pièce Expired - Lifetime EP0674971B1 (fr)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
JP61470/94 1994-03-30
JP6147094 1994-03-30
JP27084094A JPH07314300A (ja) 1994-03-30 1994-11-04 心なし研削盤
JP270840/94 1994-11-04
JP300715/94 1994-12-05
JP6300715A JPH08155747A (ja) 1994-12-05 1994-12-05 傘形ワークの加工方法
EP95301796A EP0674970A1 (fr) 1994-03-30 1995-03-17 Machine à rectifier sans centre
EP95301796 1995-03-17

Publications (2)

Publication Number Publication Date
EP0674971A1 EP0674971A1 (fr) 1995-10-04
EP0674971B1 true EP0674971B1 (fr) 1998-01-14

Family

ID=27443091

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950301920 Expired - Lifetime EP0674971B1 (fr) 1994-03-30 1995-03-22 Procédé d'usinage d'une pièce

Country Status (2)

Country Link
EP (1) EP0674971B1 (fr)
DE (1) DE69501414T2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103624183B (zh) * 2013-03-22 2015-06-17 浙江金固股份有限公司 一种轮毂气门孔去毛刺专用设备

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2110931A (en) * 1935-10-23 1938-03-15 Eaton Mfg Co Machine tool
US2151528A (en) * 1936-02-14 1939-03-21 Black & Decker Mfg Co Valve stem grinder
FR979744A (fr) * 1948-01-28 1951-05-02 Procédé et machine pour le faconnage d'objets par meulage
ES2051577T3 (es) * 1990-05-07 1994-06-16 Serdi Societe D Etudes De Real Dispositivo de rectificado de la cabeza de una valvula, en particular de un motor de combustion interna.

Also Published As

Publication number Publication date
DE69501414T2 (de) 1998-04-23
EP0674971A1 (fr) 1995-10-04
DE69501414D1 (de) 1998-02-19

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