JP2012148385A - Working fluid feeder for grinding inner surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a working fluid feeder for grinding an inner surface, ensuring strength of an arm supporting a nozzle head, feeding enough working fluid, and facilitating maintenance.SOLUTION: The arm 7 supporting the nozzle head 6 arranged between the outer peripheral surface 4a of a grinding wheel 4 and a workpiece 5 includes: an inner arcuate cross-sectional surface member 71 having an arcuate cross-sectional surface perpendicular to an axis; an outer arcuate cross-sectional surface member 72 having the arcuate cross-sectional surface perpendicular to the axis; and sidewall members 73, 74 forming both the side surfaces of the inner and outer arcuate cross-sectional surface members. A communication passage 10 having a fan-shaped cross-sectional surface perpendicular to the axis is formed. A hinge 9 is provided between a closing member 8 provided on the lateral of the wheel spindle stock 2 of the arm 7 and the wheel spindle stock so that the arm is swung in a direction perpendicular to the axis of the grinding wheel.

Description

  The present invention relates to a processing fluid supply device for a grinding wheel for internal grinding that supplies a processing fluid to an outer peripheral grinding surface of a grinding stone that grinds an inner peripheral surface of a workpiece such as an internal grinding machine.

  When supplying the processing fluid (grinding fluid or the like) to the grinding point on the inner peripheral surface of the workpiece of the internal grinding machine, the interval between the grindstone and the inner peripheral surface of the workpiece is narrowed, making it difficult to supply the processing fluid. Therefore, in Patent Document 1, a fan-shaped nozzle head is provided between the grindstone and the work inner peripheral surface as viewed from the grindstone axis direction at the tip of the arm (support portion) extending from the grindstone stand in the grindstone axis (rotation) direction. The machining fluid is supplied to the outer peripheral surface of the grindstone through a communication hole penetrating the arm. Furthermore, the nozzle head is provided with an opening that opens toward the grindstone, and the openings are formed on the inner wall surface along the outer periphery of the grindstone shaft, on both side surfaces along the grindstone end surface, and from each side surface toward the grindstone end surface. The provided brim portion is provided, the opening is filled with the machining fluid, the surrounding air flow is blocked, and the machining fluid is wound around the outer peripheral surface of the grindstone and supplied to the grinding point.

JP 2010-064207 A

  However, when processing a small-diameter workpiece with an internal grinding machine that grinds the workpiece inner diameter, the distance between the grindstone and the inner peripheral surface of the workpiece is further reduced, and the grindstone also has a smaller diameter. Further, the ratio of the distance from the grinding wheel base to the grinding wheel with respect to the grinding wheel diameter is also increased. For this reason, in the thing of the cited reference 1, in order to ensure the arm intensity | strength which supports a nozzle head, it was necessary to make an arm thick compared with a nozzle head, and there existed a problem that the dead space around a grindstone axis increased. . Furthermore, when the arm is thin, a communication hole for supplying the machining fluid cannot be secured, so that there is a problem that a sufficient machining fluid cannot be supplied to the nozzle head.

  In view of such problems, an object of the present invention is to provide an internal grinding process capable of ensuring the strength of an arm that supports a nozzle head and supplying a sufficient machining fluid even when machining an internal surface of a small-diameter workpiece. It is to provide a liquid supply apparatus. In addition, the nozzle head can reliably supply the working fluid to the outer periphery of the grindstone, and further facilitate maintenance.

  In the present invention, the outer circumferential surface of the grinding wheel provided at the tip of the grinding wheel shaft extending from the grinding wheel table, the workpiece whose inner surface is ground by the outer circumferential surface, and disposed between the outer circumferential surface and the workpiece. A nozzle head having an opening hole for supplying a machining liquid to the outer peripheral surface of the grindstone, and an arm provided in parallel to the grindstone axis between the nozzle head and the grindstone base and supporting the nozzle head. The arm includes an inner arc-shaped cross-section member having an arc-shaped cross section having a central axis on the grindstone axis side, and an outer side of an arc-right-section cross-section having a central axis on the grindstone axis side provided outside the inner arc-shaped member. An arc-shaped cross-section member, and side wall members that form both side surfaces of the inner and outer arc-shaped members in the grinding wheel axial direction, and a communication passage having a right-angle sector cross section surrounded by the inner and outer arc-shaped members and the side wall member. Forming the communication path Solving the above-mentioned problems by providing a machining fluid supply device for internal grinding, the tip of which communicates with the supply hole of the nozzle head and communicates with the supply channel of the machining fluid at the other end of the communication passage did.

  That is, since the cross-sectional shape perpendicular to the axis of the arm that supports the nozzle head is formed by the inner and outer outer arc-shaped cross-section members and the side wall member so as to have a fan-shaped cross section, the fan-shaped cross section is secured and the bending strength is secured. Becomes stronger. Further, since the nozzle head is provided between the arc-shaped cross section between the inner periphery of the workpiece and the outer periphery of the grindstone, the arm cross section can be secured to the full cross section of the nozzle head. The cross section perpendicular to the nozzle head axis is preferably an arc-shaped cross section. Further, the arcuate central axes of the inner arc-shaped cross-section member and the outer arc-shaped cross-section member may be concentric with the grindstone axis, or the inner arc-shaped cross-section member and the outer arc-shaped cross-section member may have the same cross section, that is, the same member. The nozzle head is preferably the same as that described in Patent Document 1. Further, the cross section perpendicular to the axis of the arm is preferably equal to or smaller than the cross section perpendicular to the axis of the nozzle head so as to be as small as possible.

  According to a second aspect of the present invention, a closing member is provided on a side of the grindstone of the arm, the supply member communicates with the communication path, and the supply member communicates with the communication path. And a machining fluid supply device for internal grinding, in which a connecting hole to be connected to the head and a hinge capable of swinging the arm in a direction perpendicular to the grinding wheel axis between the closing member and the grinding wheel base are provided.

  Since the arm can swing in the direction perpendicular to the axis by the hinge, the nozzle head at the tip of the arm can be separated from the outer periphery of the grindstone. Therefore, a distance from the grindstone outer periphery can be secured via the machining fluid. Further, the nozzle head can be easily retracted outward when the grindstone is replaced. It is more preferable that the hinge can be removed.

  According to the present invention, the cross-sectional shape perpendicular to the axis of the arm supporting the nozzle head is formed by the inner and outer outer arc-shaped cross-section members and the side wall member so as to have a fan-shaped cross section, and the arm cross section is ensured to the full cross section of the nozzle head. This is a process fluid supply device for internal grinding that can secure a fan-shaped cross section and increase bending strength, so that the strength of the arm supporting the nozzle head can be secured and sufficient machining fluid can be supplied. It became something to offer.

  In the invention of claim 2, the arm can be swung in a direction perpendicular to the axis by a hinge, the nozzle head can be separated from the outer periphery of the grindstone, and a distance from the outer periphery of the grindstone can be secured, or the nozzle can be easily Since the head can be retracted to the outside, the machining liquid is reliably supplied to the outer periphery of the grindstone by the nozzle head, and further maintenance is facilitated.

It is a front view of the processing liquid supply apparatus for internal grinding which shows embodiment of this invention. FIG. 2 is a partial cross-sectional view taken along line AA in FIG. 1. FIG. 3 is a partial cross-sectional view taken along line BB in FIG. 1. It is CC sectional view taken on the line of FIG.

  A working fluid supply apparatus for internal grinding according to an embodiment of the present invention will be described with reference to the drawings. 1 is a front view of a machining fluid supply device for internal grinding showing an embodiment of the present invention, FIG. 2 is a partial cross-sectional view taken along line AA in FIG. 1, and FIG. 3 is a partial cross-sectional view taken along line BB in FIG. 4 is a cross-sectional view taken along the line CC of FIG.

  As shown in FIGS. 1 to 3, an internal grinding machining fluid supply apparatus 1 according to an embodiment of the present invention includes a grinding wheel shaft 3 that extends from a grinding wheel base 2 provided on a table of an internal grinding machine (not shown). A grinding wheel 4 provided at the tip, a work 5, a nozzle head 6 and an arm 7 are provided. The grindstone shaft 3 is rotated to grind the inner peripheral surface 5a of the work 5 with the grindstone outer peripheral surface 4a. The nozzle head is supported by the arm 7 so that the nozzle head 6 is positioned between the grindstone outer peripheral surface 4a and the work inner peripheral surface 5a. The base end of the arm 7 (the side of the grinding wheel base 2) is attached to the grinding wheel base 2 via a closing member 8 and a hinge 9. The arm 7 extends in parallel along the grindstone axis 3, and a tip (other end) 7 a is fixed to the nozzle head 6. The cross section perpendicular to the axis of the arm 7 is set to be equal to or smaller than the cross section perpendicular to the axis of the nozzle head 6 on the grindstone side, so that it does not protrude from the cross section perpendicular to the axial direction of the nozzle head and avoids contact with the grindstone.

  As shown in FIGS. 2 and 4, the arm 7 includes an inner arc-shaped cross-section member 71 having a central axis on the grindstone shaft 3 side and an arc-shaped cross-section inner arc-shaped cross-section member 71. It has an outer arc-shaped cross-section member 72 having a right-angle cross-section arc shape and side wall members 73 and 74 that form both side surfaces of the inner and outer arc-shaped members in the grinding wheel axis direction. In the present embodiment, the inner arc-shaped cross-section member 71 and the outer arc-shaped cross-section member 72 have concentric cross-sectional shapes with respect to the grindstone axis, and the side wall members 73 and 74 are members having a symmetrical shape. Each member is fixed in the longitudinal (grinding wheel axis) direction by welding or the like, and forms a communication passage 10 having a right-angle sectoral cross section surrounded by inner and outer arc-shaped members 71 and 72 and side wall members 73 and 74.

  As shown in FIG. 2, the nozzle head 6 attached to the other end (tip) 7a of the arm 7 is provided with an opening 61 that opens toward the grindstone outer peripheral surface 4a, and the opening extends along the grindstone outer peripheral surface. An inner wall surface 62 and both side surfaces 63 and 64 along the grindstone end surfaces 4b and 4b are provided. The gap L between the grindstone end face and both side faces is about 0.2 to 0.5 mm on one side. An opening hole 65 that opens in the direction perpendicular to the axis is provided in the inner wall surface 62 of the opening, and the opening hole communicates with a supply hole 66 that is opened on the grinding wheel base 2 side in the direction of the grinding wheel shaft 3. The opening hole communicates with the communication path 10 of the arm 7.

  A closing member 8 is provided in the communication path 10 at the base end (grinding wheel side portion) of the arm 7. The closing member 8 is provided with a connection hole 12 that communicates with the communication path 10 and is connected to a supply path 11 that supplies the machining fluid in a direction perpendicular to the axis. A hinge 9 that can swing the arm 7 in a direction perpendicular to the grinding wheel axis is provided between the closing member and the grinding wheel base.

  As shown in FIGS. 2 and 3, the hinge 9 has a receiving base 90, 90 having a pair of pin holes 91 a, 91 b provided in the grindstone base 2, and a pin hole 81 extending from the center of the closing member 8 toward the grindstone base. The mounting portion 80 includes a pin 13 that is coaxially fitted to the pin hole of the mounting base and the mounting portion. The cradle 90 protrudes toward the grindstone axial arm 7 and is provided in a pair in the arm width direction. The mounting portion 80 protrudes toward the grinding wheel shaft direction grinding wheel base, and is inserted between the pair of cradles 90 and 90. Further, the pin 13 includes a main body portion 13a, a head portion 13b, and a tip groove 13c at the tip. A stopper washer 14 is fitted in the tip groove 13c, and the cradle 90 and the attachment portion 80 are clamped and fixed. . As a result, as indicated by an arrow 15, the arm 7 can swing around the pin 13 (in the direction perpendicular to the grindstone axis).

The upper end 8a of the mounting portion 80 of the closing member 8 and the cradle 90 upper wall surface 90a come into contact with each other when the arm 7 swings outward (upward in the drawing), and the arm moves outward. The work is prevented from contacting the nozzle head or arm. The amount of movement of the arm in the outward direction is determined by the gap h between the upper end 8a and the cradle upper wall surface 90a. This gap may be adjusted by shims, screws, bolts, or the like. Further, an elastic body such as a leaf spring, a coil spring, or rubber may be provided. A lower end portion of the attachment portion 80 is provided with an oblique relief portion 8b so that the arm can be moved to the grindstone shaft side. If it arrange | positions like a figure, an arm will be urged | biased below by gravity, and will urge a nozzle head to a grindstone outer peripheral surface. Even when the arm is not positioned on the grindstone shaft, if the machining liquid fills the clearance between the nozzle head opening 61 and the grindstone outer peripheral surface 4a, a force acts to attract the nozzle head to the grindstone. The nozzle head can be biased to the outer peripheral surface. Further, the above-mentioned elastic body can be provided to press the nozzle head against the outer peripheral surface of the grindstone.

  The operation of this embodiment will be described. As shown in FIG. 2, the machining liquid from a machining liquid supply source (not shown) is ejected from the opening hole 65 through the connection hole 12, the supply path 11, the communication path 10, and the supply hole 66. The machining fluid ejected from the opening hole flows out to the outside while being filled between the inner wall surface 62, both side surfaces 63 and 64, and the grindstone outer peripheral surface 4a. The machining liquid between the nozzle head 6 and the grindstone outer peripheral surface 4a ensures a gap between the nozzle head opening 61 and the grindstone outer peripheral surface and end surface. In addition, when processing the inner peripheral surface of the workpiece by rotating the grinding wheel, a surrounding air flow is generated on the outer peripheral surface of the wheel, reducing the supply of the processing fluid to the processing point, but filling the nozzle head opening. The flow of the accompanying air is blocked by the applied machining fluid, and the supplied opening machining fluid is wound around the outer peripheral surface of the grindstone by an appropriate amount and reliably conveyed to the machining point.

  Since the arm 7 is formed of a thin-walled member of an inner arc-shaped cross-section member 71, an outer arc-shaped cross-section member 72, and side wall members 73 and 74, and has the communication passage 10 having an axial right-angle fan-shaped cross section close to the axial perpendicular section of the nozzle head Even if the arm length is long, the strength is secured and the nozzle head 6 is supported, and a sufficient working fluid can be supplied.

  Since the arm 7 can swing around the pin 13 on the base end side of the arm 7, an attempt is made to secure a gap between the grindstone outer peripheral surface 4 a and the nozzle head 6 with the machining liquid according to the grindstone outer diameter. The force works, and the nozzle head automatically moves to the grinding wheel shaft side (inside) with the pin 13 as the center. The clearance between the outer peripheral surface of the grindstone and the nozzle head is automatically adjusted according to the arm length, the weight with the nozzle head, the amount of machining fluid, the outer diameter of the grindstone, the rotational speed, and the like.

  Further, even when the grindstone outer diameter is reduced by processing, the position of the nozzle head 6 is automatically moved. Even if the working fluid is too much, the rotational speed of the grindstone becomes high and the nozzle head is lifted, the upper end 8a and the upper wall surface 90a come into contact with each other, so the swinging in the outer direction is limited, the nozzle head is too far away, There is no risk of contact with the workpiece 5. Furthermore, if the pin 13 can be easily attached and detached, the nozzle head, the arm 7 and the like can be easily removed from the grindstone base 2 by removing the pin, so that operations such as exchanging the grindstone become easy.

  In addition, even if an arm is not necessarily parallel to a grindstone axis | shaft, the nozzle head should just be able to be supported by a grindstone stand via an arm in a predetermined position. In the opening of the nozzle head, similarly to the above-described Patent Document 1, flanges formed from both sides toward the grindstone end surface may be provided. The hinge is provided with a mounting part on the wheel head side and a cradle on the arm side so that it can be swung with a pin. Needless to say, it may be applied as appropriate by fixing by welding or the like.

1 Processing fluid supply device for internal grinding.
2 Grinding wheel base 3 Grinding wheel shaft 4 (Grinding) Grinding wheel 4a Grinding wheel outer peripheral surface 5 Work 5a Work inner surface 6 Nozzle head 7 Arm 8 Closing member 9 Hinge 10 Communication channel 11 Supply channel 12 Connection hole 65 Opening hole 66 Supply hole 71 Inner arc-shaped cross-section member 72 Outer arcuate cross-section members 73, 74 Side wall members

Claims (2)

  An outer peripheral surface of a grinding wheel provided at a tip of a grindstone shaft extending from a grindstone table, a workpiece whose inner surface is ground by the outer peripheral surface, and disposed between the outer peripheral surface and the workpiece, A nozzle head having an opening hole for supplying a machining liquid to a surface, and an arm that is provided in parallel to the grindstone axis between the nozzle head and the grindstone base, and supports the nozzle head. An inner arc-shaped cross-section member having an arc perpendicular to the axis having a central axis on the grindstone axis side, an outer arc-shaped cross-section member having an axis perpendicular to the arc having a central axis on the grindstone axis side provided outside the inner arc-shaped member, and A side wall member that forms both side surfaces of the inner and outer arc-shaped members in the direction of the grinding wheel axis, and forms a communication passage having a right-angle sector cross section surrounded by the inner and outer arc-shaped members and the side wall member. The tip of the passage is the nozzle Tsu passed feed hole and the communicating of de, the communication path the working fluid that has passed through the supply passage and the communicating inner surface grinding machining fluid supply device according to claim supplies at the other end of the.   A closing member is provided on the side of the grindstone platform of the arm, the supply path communicating with the communication path is provided in the closing member, and a connection hole connected to the supply path in a direction perpendicular to the axis is provided. 2. The machining fluid supply device for internal grinding according to claim 1, wherein a hinge capable of swinging an arm in a direction perpendicular to the grinding wheel axis is provided between the closing member and the grinding wheel base.