JP2009148842A - Deburring method and device of hollow shaft - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a deburring method and device preventing the generation of flaws in an inner circumferential face when removing burrs formed on the inner circumferential face of a hollow shaft. <P>SOLUTION: The deburring device 6 is provided primarily with: a shaft part 7 having a brush 8 at its tip portion 7b and formed with a spiral oil groove 12 on its outer circumferential face; a drive mechanism 10 rotatingly driving the shaft part 7, and a protection tube 9 having a supply part 13 with a passage 14 at its upper end portion 9a and provided in the outer circumferential side of the shaft part 7 via a clearance C for protecting the shaft part 7. The shaft 7, the brush 8 and the protection tube 9 are inserted into a hollow part 2 of the drive shaft 1, and the shaft part 7 is rotatingly driven while supplying cutting oil to the inside of the clearance C via the passage 14 to remove the burrs formed at the respective hole edges 3a, 4a and 5a of respective pin holes 3, an oil hole 4 or other holes 5 formed in the drive shaft 1, which are positioned in the inner circumferential face of the hollow part 2 of the hollow part 2, while rotating the brush 8 with its contacting with the inner circumferential face. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a deburring method and deburring device for a hollow shaft, for example, for removing burrs generated at the hole edge on the inner peripheral side of the hollow shaft when holes are formed in the hollow shaft in the radial direction from the outer peripheral side. .

  As is well known, when a radial hole is formed in the hollow shaft from the outer peripheral side, burrs are generated at the hole edge on the inner peripheral side of the hollow shaft. In order to remove this burrs, it is known to remove burrs by, for example, electrolytic deburring or air blasting. However, in the electrolytic deburring, the deburring range is strictly limited because of non-contact processing. There is a risk that it will be impossible to control. Further, in the air blast, a part of the burr is not removed and may remain so as to fall down on the inner peripheral side of the hole edge, so that the deburring accuracy may be lowered.

  Here, in order to remove the burrs without reducing the deburring accuracy, for example, a deburring device described in Patent Document 1 is known.

  Briefly, a shaft portion having a relatively small diameter, which is a handle portion inserted into the inner periphery of the hollow shaft, a brush inserted into the hollow shaft together with one end portion of the shaft portion, and the shaft portion And a drive mechanism that rotationally drives the brush via the.

  When the brush is inserted into the hollow shaft, the shaft portion is slightly bent at a predetermined angle in the radial direction at the one end side where the brush is provided in order to bring the tip into contact with the burr. A song is formed.

Then, the shaft portion and the brush are inserted into the hollow shaft, and the shaft portion is rotated by the drive mechanism, whereby the brush is rotated through the shaft portion to remove burrs. ing.
Japanese Patent Laying-Open No. 2005-288565 (FIGS. 1 and 2)

  However, since the conventional hollow shaft deburring device is bent at one end side of the shaft portion as described above, when the rotational speed of the shaft portion is increased by the drive mechanism, the centrifugal force causes the The swing around one end of the shaft is increased. Thereby, the bending site | part of the said axial part may contact the internal peripheral surface of the said hollow shaft.

  As a result, there is a possibility that the inner peripheral surface of the hollow shaft may have a dent scratch or an uneven portion due to the scar.

  The present invention has been made in view of the above-described conventional technical problems, and when removing burrs by a brush inserted into the hollow shaft through the shaft portion, the inner peripheral surface of the hollow shaft. The purpose is to prevent the occurrence of scratches.

  The present invention has been devised in view of the above-described conventional situation, and the invention according to claim 1 is a hollow shaft deburring method for removing burrs generated on the inner periphery of a hollow shaft, When a shaft portion provided with a brush is inserted into the hollow shaft and burrs are removed while rotating the brush through the shaft portion inside the hollow shaft, the inner periphery of the hollow shaft Oil is supplied between the surface and the outer peripheral surface of the shaft portion.

  In the present invention, even if the shaft portion rotates and contacts the inner peripheral surface of the hollow shaft, the friction caused by the contact is reduced by the lubricating action of the oil, so that the inner peripheral surface of the hollow shaft is damaged. Can be prevented.

  Embodiments of a deburring device for a hollow shaft according to the present invention will be described below in detail with reference to the drawings. In this embodiment, the present invention is applied to a drive shaft which is a hollow shaft used in a variable valve operating apparatus for a V-type 6-cylinder internal combustion engine described in Japanese Patent Application Laid-Open No. 2006-250010 filed earlier by the present applicant. is there. In addition, the said drive shaft has shown what is used for the one bank 3 cylinder side.

  The outline of the variable valve operating apparatus will be described. A drive shaft rotatably supported by a bearing provided on the upper part of a cylinder head, a drive cam fixed to the drive shaft, and swinging on an outer peripheral surface of the drive shaft. Between two swing cams that are supported freely and slide on the upper surface of a valve lifter disposed at the upper end of each intake valve to open each intake valve, and between the drive cam and the swing cam The transmission means is configured to be linked to transmit the rotational force of the drive cam as the swinging force of the swinging cam.

  As shown in FIG. 2, the drive shaft 1 includes a hollow portion 2 formed as an oil passage in the inner axial direction, and a plurality of pins (not shown) for fixing the drive cam to the outer peripheral surface of the drive shaft 1. A plurality of pin holes 3 to be inserted and a plurality of oil holes 4 having a smaller diameter than the respective pin holes 3 are formed at positions where the swing cams are attached. In addition to the pin holes 3 and the oil holes 4, other holes 5 are formed in the drive shaft 1.

  Each of the pin holes 3 is formed so as to penetrate along the diameter direction of the drive shaft 1 at approximately 120 ° intervals in the circumferential direction according to the mounting angle of the drive cam. The oil holes 4 are formed along the radial direction so as to communicate with the hollow portion 2 from the outer peripheral side of the drive shaft 1 in accordance with the mounting angle of the swing cam.

  When the holes 3 to 5 are formed in the drive shaft 1, the holes 3 to 5 are formed from the outer peripheral side of the drive shaft 1 to the hollow portion 2 by a drill (not shown). When formed, burrs are generated at the hole edges 3a, 4a, 5a on the hollow part 2 side of the holes 3-5.

  If the drive shaft 1 is assembled to the variable valve device without removing this burr, the burr is peeled off from the hole edges 3a, 4a, 5a by the oil flowing in the hollow portion 2, and the variable valve device. May flow into the interior. Therefore, it is necessary to remove burrs by the deburring device 6.

  As shown in FIG. 1, the deburring device 6 includes a relatively small diameter and long linear shaft portion 7 inserted into the hollow portion 2 of the drive shaft 1, and a tip portion 7 b of the shaft portion 7. A brush 8 that is inserted into the hollow portion 2 together with the shaft portion 7, a protective tube 9 that is provided on the outer peripheral side of the shaft portion 7 and protects the shaft portion 7, and rotates the shaft portion 7. It is mainly comprised from the drive mechanism 10 to drive.

  The shaft portion 7 has a base end portion 7a attached to a chuck 11 (to be described later) of the drive mechanism 10, and rotates on the outer peripheral surface from the base end portion 7a to the tip end portion 7b in the direction of the arrow in FIG. An oil groove 12 spirally formed in the same direction as the rotation direction of the shaft portion 7 is provided.

  The brush 8 is formed, for example, in a substantially brush shape by a fiber glass fiber or the like, and is provided so as to be substantially linear in the axial direction from the tip end portion 7b of the shaft portion 7 when not rotating. The brush 8 is attached with particles such as hard ceramic.

  The drive mechanism 10 is housed in a housing and includes an electric motor and a speed reducer that rotationally drives the shaft portion 7, and is attached to a main body (not shown) of the deburring device 6. Further, the chuck 11 for detachably gripping and fixing the base end portion 7a of the shaft portion 7 is provided on the distal end side of the drive mechanism 10.

  The protective tube 9 is formed to be thin so as to cover the outer peripheral surface in the range up to the front of the brush 8 between the base end portion 7a and the tip end portion 7b of the shaft portion 7, and the upper end portion 9a is supplied later. It is fixed to the main body or the like of the deburring device 6 via the portion 13 so as not to rotate integrally with the shaft portion 7. The protective tube 9 has an inner diameter d slightly larger than the outer diameter D of the shaft portion 7, and a slight gap C between the inner peripheral surface of the protective tube 9 and the outer peripheral surface of the shaft portion 7. Is formed. Further, the protective tube 9 is formed so that the outer diameter D1 is smaller than the inner diameter d1 of the hollow portion 2 of the drive shaft 1, and when the protective tube 9 is inserted into the hollow portion 2, the cylindrical gap C1 is formed in the hollow portion 2. Formed between the inner peripheral surface of each of the two.

  The supply portion 13 for supplying cutting oil to the gap C is provided at the upper end portion 9a of the protective tube 9 located on the outer peripheral side of the base end portion 7a of the shaft portion 7.

  The supply unit 13 is formed in a substantially annular shape, and a passage 14 is formed in the inside thereof so as to penetrate in a radial direction from the outer peripheral side to the inner peripheral side. The passage 14 communicates with an oil tank (not shown) via a pipe (not shown), and the cutting oil is supplied from the oil tank.

  A deburring method for the burrs generated in the hole edges 3a, 4a, 5a on the hollow portion 2 side of the drive shaft 1 by the deburring device 6 will be described.

  First, the protective tube 9 is fitted and arranged in advance on the outer peripheral side of the shaft portion 7 fixed to the drive mechanism 10 via the chuck 11, and the upper end portion 9 a of the protective tube 9 is attached to the shaft portion 7. Position and fix against it. At this time, the drive shaft 1 is fixed and supported in advance in a substantially vertical state in the vertical direction on a base or the like.

  Next, the shaft portion 7 and the protective tube 9 are moved downward in the axial direction, and together with the protective tube 9, the shaft portion 7 is moved from the tip end portion 7 b where the brush 8 is provided to one end portion of the drive shaft 1. It is inserted into the hollow portion 2 on the 1a side. At this time, since the entire brush 8 is linearly downward, the brush 8 is smoothly inserted into the interior without being caught by the hole edge of the hollow portion 2 on the one end 1a side of the drive shaft 1.

  Next, the brush 8 is positioned so as to face each of the hole edges 3a, 4a, 5a located on the other end 1b side of the hollow portion 2, and from the oil tank through the passage 14 of the supply portion 13. Then, the shaft 7 is rotationally driven by the drive mechanism 10 while supplying the cutting oil into the gap C.

  At this time, the protective tube 9 is in a non-contact state with the inner peripheral surface of the hollow portion 2 and protects the shaft portion 7 without rotating.

  As the shaft 8 is driven to rotate, the brush 8 expands radially outward due to centrifugal force. Therefore, the brush 8 moves toward the other end 1 b of the drive shaft 1 in the hollow portion 2. The burr formed on each of the hole edges 3a, 4a and 5a located in contact with the burr is rotated, and the burr is removed by scraping.

  And since the said shaft part 7 rotates in the state protected by the said protective tube 9 in the said hollow part 2, even if it contacts the inner peripheral surface of the said protective pipe 9 by a swing, Contact with the inner peripheral surface is prevented. Therefore, generation | occurrence | production of a damage | wound etc. on the internal peripheral surface of the said hollow part 2 can be prevented reliably.

  Further, since the cutting oil is supplied along the oil groove 12 from the base end portion 7a side to the tip end portion 7b side by the rotational drive of the shaft portion 7, It adheres over almost the entire circumference of the outer peripheral surface.

  For this reason, even if the shaft portion 7 rotates and contacts the inner peripheral surface of the hollow portion 2 of the protective tube 9, friction due to the contact is reduced by the lubricating action of the cutting oil, and a smooth rotation is always obtained. It is done.

  Therefore, since the brush 8 can be brought into contact with the burrs generated at the hole edges 3a, 4a, 5a and the like while rotating at high speed, the burrs can be efficiently removed.

  Further, the brush 8 is driven by moving the shaft portion 7 and the protective tube 9 upward in the hollow portion 2 from the other end portion 1b side to the one end portion 1a side while rotating the brush 8. All of the burrs generated in all the pin holes 3 formed in the shaft 1 and the respective hole edges 3a, 4a of the oil holes 4 can be quickly and sequentially removed.

  The present invention is not limited to the configuration of the previous embodiment, and for example, lubricating oil, a lubricant, or the like can be used as the cutting oil supplied into the gap C.

  Furthermore, the deburring device 6 can be applied to a hollow shaft other than the drive shaft 1 of the variable mechanism.

It is a principal part expanded sectional view of the deburring apparatus provided to this invention. It is sectional drawing of the drive shaft of this embodiment.

Explanation of symbols

1 ... Drive shaft (hollow shaft)
DESCRIPTION OF SYMBOLS 2 ... Hollow part 3 ... Pin hole 3a ... Hole edge 4 ... Oil hole 4a ... Hole edge 7 ... Shaft part 8 ... Brush 9 ... Protection pipe 10 ... Drive mechanism 12 ... Oil groove

Claims (8)

A deburring method for a hollow shaft that removes burrs generated on the inner periphery of the hollow shaft,
When a shaft portion provided with a brush at the tip is inserted into the hollow shaft, and the burr is removed while rotating the brush through the shaft portion inside the hollow shaft, the inner portion of the hollow shaft is removed. A method of deburring a hollow shaft, wherein oil is supplied between a peripheral surface and an outer peripheral surface of the shaft portion. 2. The deburring method for a hollow shaft according to claim 1, wherein the shaft portion rotates to send out the oil between an inner peripheral surface of the hollow shaft and an outer peripheral surface of the shaft portion. A deburring device for a hollow shaft that removes burrs generated on the inner periphery of the hollow shaft,
A shaft portion inserted into the hollow shaft together with a brush provided at a tip portion;
A drive mechanism for rotating the shaft portion;
A deburring device for a hollow shaft, comprising: a supply portion that supplies oil between an inner peripheral surface of the hollow shaft and an outer peripheral surface of the shaft portion. 4. The deburring device for a hollow shaft according to claim 3, wherein a spiral oil groove is formed on the outer peripheral surface of the shaft portion from the proximal end portion to the distal end portion in the rotation direction of the shaft portion. A deburring method for a hollow shaft that removes burrs generated on the inner periphery of the hollow shaft,
Inserted into the hollow shaft in a state where the outer peripheral side of the shaft portion provided with the brush at the tip portion is protected by a protective tube, and while rotating the brush through the shaft portion, the inner shaft direction of the hollow shaft A deburring method for a hollow shaft, wherein the deburring is removed by moving along the same. A deburring device for a hollow shaft that removes burrs generated on the inner periphery of the hollow shaft,
A shaft portion inserted into the hollow shaft together with a brush provided at a tip portion;
A drive mechanism for rotating the shaft portion;
A deburring device for a hollow shaft, comprising: a protective tube disposed on at least a part of an outer peripheral side of the shaft portion excluding a portion where the brush is provided. A deburring method for a hollow shaft that removes burrs generated on the inner periphery of the hollow shaft,
Inserted into the hollow shaft in a state where the outer peripheral side of the shaft portion provided with a brush at the tip portion is protected by a protective tube, and a cutting oil is inserted between the inner peripheral surface of the protective tube and the outer peripheral surface of the shaft portion. The brush is rotated through the shaft portion while supplying the protective tube, and the burr is removed by the brush while moving the protective tube, the shaft portion, and the brush along the inner axial direction of the hollow shaft. To deburr the hollow shaft. A deburring device for a hollow shaft that removes burrs generated on the inner periphery of the hollow shaft,
A shaft portion inserted into the hollow shaft together with a brush provided at a tip portion;
A drive mechanism for rotating the shaft portion;
A protective tube that is disposed on at least a part of the outer peripheral side of the shaft portion excluding a portion where the brush is provided, and protects the shaft portion;
A deburring device for a hollow shaft, comprising: a supply portion that supplies cutting oil between an inner peripheral surface of the protective tube and an outer peripheral surface of the shaft portion.

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