EP3115150A1 - Machine de polissage - Google Patents

Machine de polissage Download PDF

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Publication number
EP3115150A1
EP3115150A1 EP15758008.5A EP15758008A EP3115150A1 EP 3115150 A1 EP3115150 A1 EP 3115150A1 EP 15758008 A EP15758008 A EP 15758008A EP 3115150 A1 EP3115150 A1 EP 3115150A1
Authority
EP
European Patent Office
Prior art keywords
holding member
abrasive
movement restricting
axis
restricting part
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
EP15758008.5A
Other languages
German (de)
English (en)
Other versions
EP3115150A4 (fr
EP3115150B1 (fr
Inventor
Takahiro Fujimori
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.)
Nitto Kohki Co Ltd
Original Assignee
Nitto Kohki 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
Application filed by Nitto Kohki Co Ltd filed Critical Nitto Kohki Co Ltd
Publication of EP3115150A1 publication Critical patent/EP3115150A1/fr
Publication of EP3115150A4 publication Critical patent/EP3115150A4/fr
Application granted granted Critical
Publication of EP3115150B1 publication Critical patent/EP3115150B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/026—Fluid driven
    • 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
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/03—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor the tool being driven in a combined movement

Definitions

  • the present invention relates to polishing machines. More particularly, the present invention relates to a polishing machine in which an abrasive holding member fitted with an abrasive material is driven to rotate eccentrically.
  • a polishing machine in which an abrasive holding member fitted with an abrasive material is mounted to a drive shaft such that the abrasive holding member is rotatable about an eccentric axis extending parallel to a rotational drive center axis of the drive shaft at a position away from the rotational drive center axis, and in which the abrasive holding member is supported in such a manner as to restrict the lateral movement of the abrasive holding member in directions lateral to a radial axis that is radial to the eccentric axis, thereby moving the abrasive material in an elliptical motion which is a combination of a back-and-forth motion and an oscillating motion.
  • a guide roller mounted in the polishing machine body is rotatably engaged with the lateral side surfaces of a groove provided in the abrasive holding member (Patent Literature 1).
  • Patent Literature 1 Japanese Patent No. 5,363,870
  • the guide roller alternately engages the lateral side surfaces of the groove to thereby restrict the lateral movement of the abrasive holding member at a position where the groove is formed.
  • the guide roller In order for the guide roller to engage the groove while rotating smoothly, the guide roller has to always engage only one of the lateral side surfaces of the groove without engaging the two side surfaces simultaneously. Accordingly, the diameter of the guide roller is set smaller than the breadth of the groove so that a clearance is formed between the guide roller and one side surface of the groove. Consequently, when the guide roller moves from a position of engagement with one side surface to a position of engagement with the other side surface while the abrasive holding member is being driven, a collision occurs between the guide roller and the side surface. Since the abrasive holding member is driven at high speed, the collision occurs continuously, which may result in the polishing machine vibrating considerably.
  • An object of the present invention is to provide a polishing machine capable of reducing vibration as occurring in the conventional polishing machine.
  • the present invention provides a polishing machine comprising: a body part; a motor mounted in the body part; a drive shaft rotationally driven by the motor; an abrasive holding member to be fitted with an abrasive material and mounted to the drive shaft such that the abrasive holding member is rotatable about an eccentric axis extending parallel to a rotational drive center axis of the drive shaft at a position away from the rotational drive center axis, the abrasive holding member having a movement restricting part provided at a position away from the eccentric axis in a direction of a radial axis that is radial to the eccentric axis; and a pair of guide members mounted in the body part at respective positions away from the rotational drive center axis to engage the movement restricting part, the pair of guide members being disposed so that a first engagement position where one of the pair of guide members and the movement restricting part engage each other and a second engagement position where the other of the pair of guide members and the movement restricting part engage
  • a pair of guide members are disposed so that the position of engagement between one of the guide members and the movement restricting part and the position of engagement between the other guide member and the movement restricting part are located on laterally opposite sides across the radial axis. Therefore, it is possible to restrict the movement of the abrasive holding member in a state where each guide member and the movement restricting part are kept in contact with each other at all times. Accordingly, it is possible to reduce vibration attributed to a clearance between the guide member and the movement restricting part, as experienced with the prior art.
  • the pair of guide members may comprise guide rollers, respectively, which are rotatable relative to the body part.
  • the movement restricting part is smoothly rotationally engaged with the guide members; therefore, it is possible to reduce friction between the movement restricting part and the guide members and also possible to further reduce vibration.
  • the guide rollers may have respective rotation center axes inclined in opposite directions to each other with respect to the rotational drive center axis.
  • the movement restricting part may have engagement surfaces engaging the pair of guide members, respectively, the engagement surfaces being inclined with respect to the eccentric axis so as to face in a direction away from a position at which the abrasive material is fitted to the abrasive holding member.
  • a load that the abrasive holding member receives when the abrasive material is pressed against a material to be polished can be borne not only by a portion of the abrasive holding member that is mounted to the drive shaft but also by a portion of the abrasive holding member that is in engagement with each guide member. Accordingly, deflection of the abrasive holding member due to the load is reduced, and stress applied to the abrasive holding member is dispersed. Consequently, it becomes possible to prevent breakage of the abrasive holding member.
  • the movement restricting part may have a projection shape so as to be held between the pair of guide members.
  • the pair of guide members may each be formed of an elastic member at at least a part thereof that engages the movement restricting part.
  • the movement restricting part of the abrasive holding member may be formed of an elastic member.
  • the mutually engaging portions of the guide members and the movement restricting part are formed of elastic members, as stated above, vibration is absorbed by the elastic members, so that it becomes possible to further reduce the transmission of vibration to the body part.
  • the abrasive holding member may comprise a first part having a drive shaft mounting portion mounted to the drive shaft, an upper surface facing the body part and provided with the movement restricting part, and a lower surface facing away from the upper surface, and a second part extending from the lower surface of the first part.
  • the second part may be provided at a distal end thereof with an abrasive mounting portion to which an abrasive material is attached.
  • the movement restricting part may be located between the drive shaft mounting portion and the abrasive mounting portion in the direction of the radial axis.
  • a polishing machine 10 has, as shown in Figs. 1 and 2 , a body part 12 and an abrasive holding member 16 attached to a holding member mounting portion 14 located at the lower end of the body part 12.
  • the body part 12 is provided therein with a vane air motor 18, and a cup-shaped drive shaft 22 is secured to the lower end of an output shaft 20 of the vane air motor 18.
  • the drive shaft 22 is driven to rotate about a rotational drive center axis 24 which is coincident with the axis of the output shaft 20.
  • the drive shaft 22 is provided with a recess 26 with a circular cross-section centered on an eccentric axis 25 extending parallel to the rotational drive center axis 24 at a position away from the rotational drive center axis 24.
  • the recess 26 has a tubular member 30 rotatably mounted therein through a radial bearing 28 attached to a circular inner peripheral surface 27 of the recess 26.
  • the tubular member 30 constitutes an inner raceway of the radial bearing 28 and has an inner peripheral surface forming a threaded hole 32.
  • the threaded hole 32 is threadedly engaged with a bolt 36 through a stepped hole 34 in the abrasive holding member 16, thereby allowing the abrasive holding member 16 to be secured to the tubular member 30.
  • the abrasive holding member 16 is mounted to the drive shaft 22, which is driven to rotate about the rotational drive center axis 24, such that the abrasive holding member 16 is rotatable about the eccentric axis 25.
  • the abrasive holding member 16 has a movement restricting part 40 extending along a radial axis 38 extending in a predetermined radial direction (direction of radius) from the eccentric axis 25, as will be explained below.
  • the movement restricting part 40 is engaged from both sides by a pair of guide rollers 42 and 43 provided in the holding member mounting portion 14 of the body part 12, thereby restricting the lateral movement of the movement restricting part 40.
  • the polishing machine 10 is a device that polishes a material to be polished by pressing the abrasive material 44, which moves in a reciprocating elliptical motion as stated above, against the material to be polished.
  • the body part 12 is provided at its rear end (right end as seen in Fig. 3 ) with an air tube joint 46 for connecting an air tube extending from an air pump (not shown), thereby introducing compressed air supplied through the connected air tube into the body part 12.
  • a compressed air flow path 48 extends from the air tube joint 46 to the vane air motor 18.
  • the compressed air flow path 48 is provided therein with a switching valve mechanism 52 which is actuated to open or close with an operating lever 50 pivotably attached to the body part 12. By actuating the operating lever 50, the supply of compressed air to the vane air motor 18 is controlled to thereby control the drive and stop of the vane air motor 18.
  • the vane air motor 18 and the switching valve mechanism 52 in the polishing machine 10 are well-known to those skilled in the art; therefore, a detailed explanation thereof is omitted.
  • the abrasive holding member 16 has a horizontal portion 56 extending forward (leftward as seen in Figs. 3 and 4 ) and having an upper surface 54 facing the body part 12 and a lower surface 55 facing away from the upper surface 54, a vertical portion 58 extending downward from a front end portion 57 of the lower surface 55 of the horizontal portion 56, and an abrasive mounting portion 59 extending forward from the lower end of the vertical portion 58.
  • the abrasive material 44 is attached to a lower surface 61 of the abrasive mounting portion 59 by using a pressure-sensitive adhesive seal. Both of the side portions of the horizontal portion 56, the vertical portion 58, and the abrasive mounting portion 59 are provided with ribs 60 to impart sufficient strength to the abrasive holding member 16.
  • the above-described pair of guide rollers 42 and 43 are, as shown in Fig. 4 , disposed on the laterally opposite sides of a predetermined radial axis 38 extending from the eccentric axis 25 at respective positions facing each other across the radial axis 38.
  • the guide rollers 42 and 43 have rotation center axes 62 and 63, respectively, which are, as will be clear from Fig. 2 , inclined in opposite directions to each other with respect to the rotational drive center axis 24 of the drive shaft 22 so as to come closer to each other toward the upper side as seen from the front side of the polishing machine 10.
  • rotational engagement surfaces 64 and 65 of the guide rollers 42 and 43 are also inclined with respect to the rotational drive center axis 24 in the same way as the rotation center axes 62 and 63 of the guide rollers 42 and 43.
  • the term "directions lateral to the radial axis 38" as used herein means directions perpendicularly intersecting both the eccentric axis 25 and the radial axis 38.
  • the left side as seen in Fig. 2 corresponds to the right side of the radial axis 38
  • the right side as seen in Fig. 2 corresponds to the left side of the radial axis 38.
  • the upper side as seen in Fig. 4 corresponds to the right side of the eccentric axis 25, and the lower side as seen in Fig. 4 corresponds to the left side of the eccentric axis 25.
  • the upper surface 54 of the abrasive holding member 16 is provided with an movement restricting part 40 of a rubber material at a position away from the eccentric axis 25 in the direction of the radial axis 38, which is radial to the eccentric axis 25.
  • the movement restricting part 40 has stabilizing engagement surfaces 68 and 69 engaging the pair of guide rollers 42 and 43, respectively.
  • the stabilizing engagement surfaces 68 and 69 are, as will be clear from Fig. 2 , located on the laterally opposite sides of the radial axis 38 and inclined in opposite directions to each other with respect to the eccentric axis 25 (superimposed on the rotational drive center axis 24 in Fig.
  • the inclination angles of the stabilizing engagement surfaces 68 and 69 are set to be the same as the inclination angles of the rotation center axes 62 and 63 of the corresponding guide rollers 42 and 43.
  • the movement restricting part 40 has a projection shape projecting upward so as to be held between the pair of guide rollers 42 and 43.
  • the position of engagement between the left guide roller 42 and the left stabilizing engagement surface 68 of the movement restricting part 40 and the position of engagement between the right guide roller 43 and the right stabilizing engagement surface 69 of the movement restricting part 40 are located on the laterally opposite sides of the radial axis 38 at respective positions facing each other across the radial axis 38.
  • the abrasive holding member 16 When the vane air motor 18 is rotationally driven, the abrasive holding member 16 performs an eccentric circular motion with respect to the rotational drive center axis 24 at the position of the stepped hole 34. At the position where the movement restricting part 40 is provided, however, the abrasive holding member 16 is restricted from moving in the directions lateral to the radial axis 38 by the pair of guide rollers 42 and 43.
  • the abrasive holding member 16 moves in such a manner that the abrasive holding member 16 is displaced along the direction of the radial axis 38, which is radial to the eccentric axis 25, while pivoting about a point between the positions of engagement between the stabilizing engagement surfaces 68 and 69 of the movement restricting part 40 and the associated guide rollers 42 and 43.
  • the abrasive mounting portion 59 which is located further forward of the movement restricting part 40 as seen in the direction of the eccentric axis 25, performs a reciprocating elliptical motion which is a combination of an oscillating motion and a rectilinear motion.
  • the locus of the abrasive mounting portion 59 changes depending on the positional relationship between the eccentric axis 25, the movement restricting part 40, and the abrasive mounting portion 59. That is, when the movement restricting part 40 is located at the midpoint between the eccentric axis 25 and the abrasive mounting portion 59, the locus of the abrasive mounting portion 59 is circular. In this regard, however, motions of the abrasive mounting portion 59, including a motion describing such a circular locus, are herein referred to as "elliptical motion". Precisely, the locus of the abrasive mounting portion 59 is not elliptical or circular but a slightly distorted elliptical or circular shape.
  • the movement restricting part 40 is engagingly supported by two distinct guide rollers 42 and 43 at positions on the laterally opposite sides of the radial axis 38, which is radial to the eccentric axis 25. Therefore, the movement restricting part 40 and the guide rollers 42 and 43 can be kept in contact with each other at all times. Consequently, there will be no collision between the movement restricting part 40 and either of the guide rollers 42 and 43, and it is possible to reduce vibration considerably.
  • the movement restricting part 40 of the abrasive holding member 16 is formed of a rubber material, which is an elastic member, as has been stated above. Therefore, when the abrasive holding member 16 is moved, the movement restricting part 40, which is held between the pair of guide rollers 42 and 43, always keeps in contact with the guide rollers 42 and 43 while being elastically deformed at the positions of engagement with the guide rollers 42 and 43. Further, since the movement restricting part 40 is formed of a rubber material, vibration of the abrasive holding member 16 is absorbed by the rubber material, so that the transmission of vibration to the body part 12 is further reduced. It should be noted that although in this embodiment the movement restricting part 40 is formed of an elastic member, the rotational engagement surfaces 64 and 65 of the guide rollers 42 and 43 may each be formed of an elastic member instead.
  • the stabilizing engagement surfaces 68 and 69 of the movement restricting part 40 face obliquely upward, and the rotational engagement surfaces 64 and 65 of the guide rollers 42 and 43 face obliquely downward; therefore, the pair of guide rollers 42 and 43 can receive not only lateral force but also upward force from the abrasive holding member 16. Consequently, upward force that the abrasive holding member 16 is subjected to when the abrasive material 44 is pressed against a material to be polished during a polishing operation can be borne not only by the joint between the abrasive holding member 16 and the drive shaft 22 but also by the movement restricting part 40.
  • the pair of guide rollers 42 and 43 are installed so that the rotation center axes 62 and 63 extend obliquely, thereby making the inclination angles of the rotational engagement surfaces 64 and 65 substantially the same as the inclination angles of the stabilizing engagement surfaces 68 and 69 of the movement restricting part 40.
  • guide rollers 142 and 143 as shown in Fig. 5 , whose rotation center axes 162 and 163 are parallel to the rotational drive center axis 24 of the drive shaft 22 and whose rotational engagement surfaces 164 and 165 are conical surfaces inclined with respect to the rotation center axes 162 and 163.
  • the movement restricting part 40 which has a projection shape, may be replaced with a movement restricting part 240, as shown in Fig. 6 , which is shaped with a recess whose lateral side surfaces are defined as stabilizing engagement surfaces 268 and 269 engageable with guide rollers 242 and 243, respectively.
  • the stabilizing engagement surfaces 268 and 269 are formed to oppose each other in the lateral direction and to face upward.
  • the guide rollers 242 and 243 are installed so that their rotation center axes 262 and 263 are inclined in opposite directions to each other with respect to the rotational drive center axis 24 of the drive shaft 22 so as to come closer to each other toward the lower side.
  • the abrasive holding member 16 of the polishing machine 10 can be easily detached by removing the bolt 36 and can also be replaced with another abrasive holding member, if necessary.
  • the abrasive holding member 16 may be replaced with a flat plate-shaped abrasive holding member 116.
  • the abrasive holding member 116 is rotatably mounted to the drive shaft 22 in the same way as the abrasive holding member 16 shown in Figs. 1 to 4 and has a movement restricting part 140 held between the pair of guide rollers 42 and 43.
  • an abrasive material 144 stuck on a lower surface 161 of the abrasive holding member 116 performs a reciprocating elliptical motion.
  • the abrasive holding member 16 may be replaced with a disk-shaped abrasive holding member 216.
  • the abrasive holding member 216 does not have either of the movement restricting parts 40 or 140, which are engaged with the pair of guide rollers 42 and 43.
  • the abrasive holding member 216 is free to rotate about the eccentric axis 25 without being restricted.
  • the abrasive holding member 216 has an abrasive material 244 attached to a lower surface 261 thereof.
  • the abrasive holding member 216 revolves around the rotational drive center axis 24 of the drive shaft 22, and while doing so, the abrasive holding member 216 rotates about the eccentric axis 25 by friction that the abrasive material 244 receives from the material to be polished and by its own centrifugal force.
  • the guide rollers 42 and 43 are used as guide members that guide the movement restricting part 40 (140) of the abrasive holding member 16(116), thereby rotationally supporting the movement restricting part 40 (140) and thus reducing sliding friction between each guide member and the movement restricting part 40
  • the guide rollers 42 and 43 need not necessarily be used as guide members.
  • members made of a material having low frictional properties may be used to slidably support the movement restricting part 40 (140).
  • the movement restricting part 40 (140) may also be supported with members that are flexibly elastically deformable in response to movement of the movement restricting part 40 (140).
  • Polishing machine 10 body part 12; holding member mounting part 14; abrasive holding member 16; vane air motor 18; output shaft 20; drive shaft 22; rotational drive center axis 24; eccentric axis 25; circular inner peripheral surface 27; radial bearing 28; tubular member 30; threaded hole 32; stepped hole 34; bolt 36; radial axis 38; movement restricting part 40; guide rollers 42 and 43; abrasive material 44; air tube joint 46; compressed air flow path 48; operating lever 50; switching valve mechanism 52; upper surface 54; lower surface 55; horizontal portion 56; front end portion 57; vertical portion 58; abrasive mounting portion 59; ribs 60; lower surface 61; rotation center axes 62 and 63; rotational engagement surfaces 64 and 65; stabilizing engagement surfaces 68 and 69; (flat plate-shaped) abrasive holding member 116; movement restricting part 140; guide rollers 142 and 143; abrasive material 144; lower surface 161; rotation center axes

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP15758008.5A 2014-03-07 2015-02-26 Machine de polissage Active EP3115150B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014044860A JP6249828B2 (ja) 2014-03-07 2014-03-07 研磨機
PCT/JP2015/055554 WO2015133355A1 (fr) 2014-03-07 2015-02-26 Machine de polissage

Publications (3)

Publication Number Publication Date
EP3115150A1 true EP3115150A1 (fr) 2017-01-11
EP3115150A4 EP3115150A4 (fr) 2017-10-18
EP3115150B1 EP3115150B1 (fr) 2018-07-11

Family

ID=54055164

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15758008.5A Active EP3115150B1 (fr) 2014-03-07 2015-02-26 Machine de polissage

Country Status (7)

Country Link
EP (1) EP3115150B1 (fr)
JP (1) JP6249828B2 (fr)
KR (1) KR101882119B1 (fr)
CN (1) CN106061677B (fr)
AU (1) AU2015225119B2 (fr)
TW (1) TWI568532B (fr)
WO (1) WO2015133355A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102284904B1 (ko) * 2017-03-29 2021-08-02 니토 코키 가부시키가이샤 휴대식 버 제거기

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB370269A (en) * 1930-06-26 1932-04-07 Mariano Castells Improvements in grinding and polishing devices
JPS5363870A (en) 1976-11-19 1978-06-07 Hitachi Ltd Assembling method of semiconductor device
JPH0282456U (fr) * 1988-12-14 1990-06-26
DE3942301C1 (fr) * 1989-12-21 1991-02-14 Robert Bosch Gmbh, 7000 Stuttgart, De
JP2539595Y2 (ja) * 1991-12-05 1997-06-25 有限会社信濃エンジニアリング 研磨装置
US5419737A (en) * 1993-10-28 1995-05-30 Ryobi Motor Products Corp. Random orbital sanding machine having a removable debris container
JP3625529B2 (ja) * 1995-06-09 2005-03-02 道明 ▲えき▼田 カキ・ホタテ剥き機
US5947804A (en) * 1998-04-27 1999-09-07 Ryobi North America, Inc. Adjustable eccentricity orbital tool
JP4147673B2 (ja) * 1999-03-12 2008-09-10 日立工機株式会社 セーバソー
EP2127808A1 (fr) * 2008-05-29 2009-12-02 Black & Decker, Inc. Outil électrique
JP5363870B2 (ja) * 2009-05-14 2013-12-11 日東工器株式会社 偏芯回転運動を伴う研磨装置
CN102441707B (zh) * 2011-12-15 2013-10-30 宁波汉浦工具有限公司 轻便型两用锯

Also Published As

Publication number Publication date
AU2015225119A1 (en) 2016-09-01
WO2015133355A1 (fr) 2015-09-11
JP2015168032A (ja) 2015-09-28
EP3115150A4 (fr) 2017-10-18
CN106061677A (zh) 2016-10-26
AU2015225119B2 (en) 2017-03-09
TWI568532B (zh) 2017-02-01
KR20160119160A (ko) 2016-10-12
JP6249828B2 (ja) 2017-12-20
EP3115150B1 (fr) 2018-07-11
CN106061677B (zh) 2017-12-22
TW201600227A (zh) 2016-01-01
KR101882119B1 (ko) 2018-07-25

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