JP2014069303A - Vertical grinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a vertical inner surface grinder whereby grinding of a workpiece can be easily ground, even if the workpiece has no hole or the like for discharging a grinding liquid.SOLUTION: A vertical inner surface grinder comprises a work table 101 which holding and rotating the bottom surface of a workpiece 150 having a recess 150a, a grindstone 103 for grinding the inner surface of the recess 150a, a grinding liquid supply part 121 for supplying grinding liquid 120 to a grinding point of the grindstone 103, and a grinding liquid suction part 131 for sucking the grinding liquid 120 that remains in the recess 150a. The grinding liquid suction part 131 includes a suction nozzle 132a having an opening 132a in the tip thereof, and the opening 132a is oriented to the travel direction of eddy current generated in the grinding liquid 120 by rotation of the work table 101.

Description

  The present invention relates to a vertical internal grinding apparatus.

  The internal grinding device for grinding the inner surface of a cylindrical workpiece generally has a horizontal shape in which the workpiece and the grindstone are arranged in the horizontal direction (see, for example, Patent Document 1). However, since the workpiece held in the horizontal direction is rotated, it is difficult to reduce the size of the apparatus. In particular, in recent years, the size of a workpiece has been increased, and a small-sized internal grinding device capable of processing a large workpiece has been demanded. For this reason, a vertical internal grinding device in which a workpiece and a grindstone are arranged in a vertical direction has been studied.

JP-A-11-320351

  However, when grinding a workpiece, it is essential to supply a grinding fluid. In the case of a workpiece without a bottom surface or a workpiece having a hole through which grinding fluid can be discharged on the bottom surface, the workpiece can be arranged vertically. However, in the case of a workpiece having a closed bottom surface and no holes, if it is arranged vertically, the grinding fluid cannot escape and the grinding fluid will stay in the recess. If the grinding fluid stays, problems such as a loss of grinding power due to the entrainment of the grinding fluid and a decrease in machining accuracy due to the inclusion of sludge or the like caused by grinding arise. Therefore, in the conventional vertical inner surface grinding apparatus, the bottom surface is closed, and it is difficult to grind the inner surface of a workpiece that does not have a hole or the like for discharging the grinding fluid.

  An object of the present invention is to solve the above-mentioned problems and to realize a vertical internal grinding apparatus that can easily grind a workpiece that does not have a hole or the like for discharging a grinding fluid. To do.

  A vertical internal grinding device of the present disclosure includes a work table that rotates while holding a bottom surface of a workpiece having a recess, a grindstone that grinds the inner surface of the recess, and a grinding fluid supply unit that supplies a grinding fluid to a grinding point of the grindstone And a grinding fluid suction part for sucking the grinding fluid staying in the recess, the grinding fluid suction part has a suction nozzle having an opening at the tip, and the opening is generated in the grinding fluid by the rotation of the work table. It is suitable for the direction of vortex flow.

  The vertical internal grinding device of the present disclosure may further include a horizontal movement stage that moves the work table in the horizontal direction, and the suction nozzle may be held by the horizontal movement stage.

  The vertical internal grinding device of the present disclosure may further include a vertical movement stage that moves the grindstone in the vertical direction, and the suction nozzle may be held by the vertical movement stage.

  In the vertical internal grinding device of the present disclosure, the tip of the suction nozzle may be cut obliquely. Further, the tip of the suction nozzle may be curved in an L shape.

  According to the vertical inner surface grinding apparatus according to the present invention, it is possible to easily grind a workpiece which does not have a hole or the like for discharging a grinding fluid.

It is a model which shows the principal part of the internal grinding apparatus which concerns on one Embodiment. It is an external view which shows an example of a suction nozzle. It is a top view which shows the example of arrangement | positioning of a suction nozzle. It is an external view which shows the modification of a suction nozzle. It is sectional drawing which shows the modification of the principal part of an internal grinding apparatus.

  As shown in FIG. 1, an inner surface grinding apparatus 100 according to an embodiment includes a work table 101 that rotates while holding a bottom surface of a workpiece 150 having a recess 150a, a grindstone 103 that grinds the inner surface of the recess 150a, and a work piece. A grinding fluid supply unit 121 that supplies the grinding fluid 120 to the workpiece 150 and the grindstone 103 and a grinding fluid suction unit 131 that suctions excess grinding fluid 120 in the recess 150a are provided.

  The work table 101 is usually disk-shaped, is attached to a rotatable main shaft (not shown), and can freely rotate the workpiece 150 held on the work table 101. The work table 101 is attached to a horizontal movement stage (X-axis stage) 102 and can move in the horizontal direction. The grindstone 103 is attached to a rotatable grindstone shaft 111 in an exchangeable manner, and can be rotated in the direction opposite to the work table 101. The grindstone shaft 111 is attached to a wheel head 114 attached to a vertical direction moving stage (Z-axis stage) 113, and the grindstone 103 is movable in the vertical direction.

  The grinding fluid supply unit 121 supplies the grinding fluid 120 to a grinding point where the workpiece 150 chucked by the work table 101 and the grindstone 103 come into contact with each other. The grinding fluid suction part 131 sucks the grinding fluid 120 in the recess 150a and discharges it outside the recess 150a. The grinding fluid suction part 131 has a suction nozzle 132 and a negative pressure generator (not shown), and the suction nozzle 132 is fixed to the X-axis stage 102 by a suction nozzle holding part 135. The suction nozzle holding unit 135 is configured so that the suction nozzle 132 can be retracted when the workpiece 150 is attached to and detached from the work table 101. The suction nozzle holding unit 135 has a function of adjusting the position of the tip of the suction nozzle 132 according to the shape and size of the workpiece 150.

  By generating a negative pressure with the negative pressure generator, the grinding fluid 120 can be sucked from the tip of the suction nozzle 132 and discharged out of the recess 150a. For this reason, even when the opening part which can discharge | emit the grinding fluid 120 is not provided in the bottom face of the workpiece 150, an unnecessary grinding fluid does not stay in the recessed part 150a, but the inner surface of the workpiece 150 is made. It can be easily ground.

  The suction nozzle 132 only needs to suck the grinding fluid 120 and may be a simple straight pipe. However, as shown in FIG. 2, it is preferable to cut the tip portion obliquely so that the opening 132a is located on the side surface. The grinding fluid 120 supplied from the grinding fluid supply unit 121 is guided downward in the recess by gravity. Further, since the work table 101 that holds the workpiece 150 is rotating, a vortex flows along the rotation direction of the work table 101. For this reason, as shown in FIG. 3, the suction efficiency of the grinding fluid 120 can be improved by disposing the suction nozzle 132 so that the opening 132a faces the direction of vortex flow.

  The grinding fluid 120 in the recess 150 a includes sludge such as chips generated by grinding the workpiece 150 by the grindstone 103 and abrasive grains dropped from the grindstone 103. In general, when performing internal grinding, the rotational direction of the workpiece 150 and the rotational direction of the grindstone 103 are reversed, and the rotational speed of the grindstone 103 is made faster than the rotational speed of the workpiece 150. For this reason, the sludge generated by grinding once goes in the direction opposite to the rotation direction of the workpiece 150, but finally moves along the flow of the grinding fluid 120. For this reason, by arranging the suction nozzle 132 so that the opening 132a faces the vortex flow direction, it becomes easy to suck the sludge together with the grinding fluid 120 and discharge it out of the recess 150a.

  FIG. 2 shows an example in which the opening 132 a is formed on the side surface of the suction nozzle 132 by obliquely cutting the tip of the suction nozzle 132. However, it suffices if the opening 132a of the suction nozzle 132 can be disposed so as to face the direction of the vortex flow. For this reason, as shown in FIG. 4, you may curve the front-end | tip part of the suction nozzle 132 in L shape. In this case, it is preferable to prevent corners from being generated in the curved portion of the suction nozzle 132 in order to avoid sludge retention and the like.

  The suction nozzle 132 only needs to be disposed at a position where the tip of the suction nozzle 132 can suck the grinding fluid 120 accumulated in the recess 150a. Therefore, for example, as shown in FIG. 1, the suction nozzle holding part 135 that has only to be fixed by providing the suction nozzle holding part 135 on the X-axis stage 102 is provided on the work table 101 side. The position of the grindstone 103 can be controlled independently. For this reason, the grindstone 103 can be moved up and down freely during grinding.

  On the other hand, the suction nozzle 132 may be attached to the Z-axis stage 113 as shown in FIG. In this case, when the position of the grindstone 103 is moved up and down, the position of the tip of the suction nozzle 132 also moves up and down. However, there is no problem if it is not necessary to move the grindstone 103 up and down during grinding. Since the horizontal position of the suction nozzle 132 with respect to the grindstone 103 is fixed, there is also an advantage that the nozzle position can be easily adjusted. Even when the grindstone 103 is moved up and down during grinding, there is a gap between the grindstone 103 and the bottom surface of the recess 150a at the position where the grindstone 103 is lowered most, and the tip of the suction nozzle 132 is at the recess 150a. There is no problem if it does not touch the bottom of

  The material of the suction nozzle 132 is not particularly limited, but metal, resin, or the like can be used. As the metal, stainless steel, iron, aluminum, or the like can be used. As the resin, a thermosetting resin such as polyamide or polyimide, polyvinyl chloride, polystyrene, polyacrylonitrile butadiene styrene (ABS), or the like can be used. Moreover, it is good also as a composite of a metal and resin. For example, the tip portion that needs to be processed may be formed of resin, and the base portion that needs strength may be formed of metal. The tip may be an elastomer such as rubber. Moreover, the surface of these materials may be plated.

  The surface of the suction nozzle 132, particularly the inner surface, is preferably smooth. For example, when the suction nozzle 132 is a metal, it may be smoothed by electrolytic polishing or the like. By smoothing the inner surface of the suction nozzle 132, even when the grinding fluid 120 containing sludge is sucked, suction can be performed smoothly, and clogging of the nozzle can be made difficult to occur.

  The outer diameter and inner diameter of the suction nozzle 132 may be determined according to the size of the grindstone 103 and the recess 150a, the required strength of the suction nozzle 132, and the like. It is preferable that the suction nozzle 132 and the side surface and the bottom surface of the recess 150a are spaced from each other by about 0.1 mm to 0.2 mm. In internal grinding, the ratio between the diameter of the recess 150a and the diameter of the grindstone 103 is generally about 0.5 to 0.7. Accordingly, when the diameter of the recess 150a is larger than about 50 mm, the suction nozzle 132 having an outer diameter of about 10 mm can be used without any problem.

  The negative pressure generator may be any device as long as it can generate negative pressure and suck the grinding fluid 120. For example, if a diffuser type suction pump using compressed air is used, the grinding fluid 120 containing sludge can be easily sucked. The negative pressure generator may be incorporated anywhere, but when the suction nozzle 132 is fixed to the Z axis stage, the negative pressure generator may be incorporated into the Z axis stage.

  The sucked grinding fluid 120 may be discarded as it is, but sludge may be separated using a bag filter or the like. It is also possible to reuse sludge after separation.

  The grinding fluid 120 is not particularly limited, and a water-soluble grinding fluid containing a surfactant or the like can be used. An oil-based water-insoluble grinding fluid may also be used. What is necessary is just to select the grinding fluid 120 suitably according to the kind and workpiece content of the workpiece 150. FIG.

  The grinding fluid supply unit 121 may have any configuration as long as the grinding fluid 120 can be supplied to a grinding point where the grindstone 103 and the workpiece 150 are in contact with each other. The supply amount of the grinding fluid 120 may be adjusted according to the state of grinding. Further, the amount of the grinding fluid 120 supplied by the grinding fluid supply unit 121 and the amount of the grinding fluid 120 sucked by the grinding fluid suction unit 131 may be controlled to be balanced.

  The vertical inner surface grinding apparatus according to the present embodiment has a grinding fluid suction part for sucking grinding fluid, and is placed vertically even on a workpiece that does not have a hole or the like through which grinding fluid can be discharged. Can be ground. For this reason, it is possible to easily grind the cylinder with the head of the engine. Moreover, the apparatus can be reduced in size compared with a horizontal type internal grinding apparatus.

  The vertical internal grinding device according to the present invention can easily grind a workpiece that does not have a hole for discharging a grinding fluid, and is particularly useful as a grinding device used for grinding an engine or the like.

DESCRIPTION OF SYMBOLS 100 Internal grinding apparatus 101 Work table 102 X-axis stage 103 Grinding wheel 111 Grinding wheel shaft 113 Z-axis stage 114 Wheel head 120 Grinding liquid 121 Grinding liquid supply part 131 Grinding liquid suction part 132 Suction nozzle 132a Opening 135 Suction nozzle holding part 150 Work piece 150a Recess

However, when grinding a workpiece, it is essential to supply a grinding fluid. In the case of a workpiece without a bottom surface or a workpiece having a hole through which the grinding fluid can be discharged on the bottom surface, the workpiece can be arranged vertically. However, in the case of a workpiece having a closed bottom surface and no holes, if it is arranged vertically, the grinding fluid cannot escape and the grinding fluid will stay in the recess. If the grinding fluid stays, problems such as a loss of grinding power due to the entrainment of the grinding fluid and a decrease in machining accuracy due to the inclusion of sludge or the like caused by grinding arise. Therefore, in the conventional vertical inner surface grinding apparatus, the bottom surface is closed, and it is difficult to grind the inner surface of a workpiece that does not have a hole or the like for discharging the grinding fluid.

Claims (5)

A work table that rotates while holding the bottom surface of the workpiece having a recess;
A grindstone for grinding the inner surface of the recess;
A grinding fluid supply unit for supplying a grinding fluid to the grinding point of the grinding wheel;
A grinding fluid suction part for suctioning the grinding fluid staying in the recess,
The grinding fluid suction part has a suction nozzle having an opening at a tip part,
The vertical internal grinding apparatus, wherein the opening is directed in a traveling direction of a vortex generated in the grinding liquid by rotation of the work table. A horizontal movement stage for moving the work table in the horizontal direction;
The vertical internal grinding device according to claim 1, wherein the suction nozzle is held by the horizontal movement stage. A vertical movement stage for moving the grindstone in the vertical direction;
The vertical internal grinding device according to claim 1, wherein the suction nozzle is held by the vertical movement stage.   The vertical internal grinding device according to any one of claims 1 to 3, wherein a tip portion of the suction nozzle is cut obliquely.   The vertical internal grinding device according to any one of claims 1 to 3, wherein a tip portion of the suction nozzle is curved in an L shape.

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