JP4817141B2 - Grinder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grinding machine which shortens workpiece replacement time of a worker by attaching an inexpensive device at a grinding wheel cover. <P>SOLUTION: This internal grinding machine has: a main spindle 14 for retaining a cylindrical workpiece W; a grinding wheel 19 for grinding an inner surface of the workpiece W retained by the main spindle 14; a table 16 for moving the grinding wheel 19 between a grinding position and a non-grinding position apart from the grinding position in a grinding wheel axial direction; the grinding wheel cover 22 moved together with the grinding wheel 19 in the grinding wheel axial direction; an upper and lower swing arm 21 for moving the grinding wheel cover 22 between a cover position for covering the grinding wheel 19 with the grinding wheel cover 22 and a non-cover position for exposing the grinding wheel 19; and a workpiece retaining member 41 provided at the grinding wheel cover 22 so as to retain the workpiece W retained by the main spindle 14 while moving the grinding wheel 19 from the non-grinding position to the grinding position in a state of the grinding wheel cover 22 being positioned at the cover position. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a grinding machine for grinding an inner surface of a cylindrical workpiece.

  This type of internal grinding machine includes a spindle that holds a cylindrical workpiece, a grindstone that grinds the inner surface of the workpiece held by the spindle, and a grinding position between the grinding wheel and a non-grinding position that is separated from the grinding wheel in the axial direction. There are known ones equipped with a grindstone moving means that is moved in the above and a grindstone cover that is moved together with the grindstone in the grindstone axial direction.

  The grinding method using the internal grinding machine is as follows. The workpiece held on the spindle is ground with the grindstone positioned at the grinding position and the grindstone cover positioned at the non-cover position. After the grinding of the workpiece is completed, the grindstone is moved from the grinding position to the non-grinding position while the grindstone cover is kept in the non-cover position. With the grindstone positioned at the non-grinding position, the grindstone cover is moved from the non-covering position to the cover position. The holding of the workpiece after grinding by the workpiece holding member is released, and the workpiece to be ground next is held on the main shaft. The grindstone cover is moved from the cover position to the non-cover position, and the grindstone is moved from the non-grinding position to the grinding position, and the workpiece to be ground next is ground.

  In the above grinding method, when exchanging the workpiece, the workpiece that has been ground is released from the main spindle, and the workpiece to be ground is placed in the inner grinder without removing the workpiece from the inner grinder. It cannot be carried and held on the spindle. The worker must divide the workpiece unloading step and the loading step separately and perform them separately in two cycles, and there is a problem that it takes time to replace the workpiece.

  An object of the present invention is to provide a grinding machine capable of shortening an operator's work exchange time by attaching an inexpensive device to a grindstone cover.

  The grinding machine according to the present invention moves between a main shaft that rotatably holds a workpiece, a grindstone that grinds the workpiece held on the main shaft, and a grindstone between a grinding position and a non-grinding position that is separated from the grinding wheel in the axial direction. A grindstone moving means, a grindstone cover moved together with the grindstone in the direction of the grindstone axis, a cover moving means for moving the grindstone cover between a cover position where the grindstone cover covers the grindstone and a non-cover position where the grindstone is exposed, and a grindstone cover And a workpiece holding member provided on the grindstone cover so that the workpiece can be held in a state where is positioned at the cover position.

  In the internal grinding machine according to the present invention, the workpiece to be ground next is carried into the internal grinding machine while being held by the workpiece holding member while being held by the workpiece holding member. The workpiece can be taken out from the internal grinding machine. Therefore, the work loading process and the unloading process can be performed in one cycle, and the work replacement time can be shortened.

  Furthermore, when the work holding member is formed in a shape that can be projected from the grindstone cover in parallel with the rotation axis of the spindle and can be fitted to the inner surface of the work, it is easy to hold and release the work by the work holding member. Can be done by.

  According to the grinding machine of the first aspect of the present invention, since the work holding member is provided on the grindstone cover that can be moved between the cover position and the non-cover position, the time for exchanging the work by an inexpensive device can be shortened.

  According to the grinding machine of the second aspect of the present invention, since the work holding member is formed in a shape that protrudes in parallel with the rotation axis of the main shaft from the grindstone cover and can be fitted to the inner surface of the work, In addition, the hollow workpiece can be exchanged only by the relative movement between the grindstone platform and the headstock.

  Embodiments of the present invention will be described below with reference to the drawings.

  In the following description, the front and rear refer to the lower side in FIG. 1 as the front and the upper side as the rear, and the left and right refer to the left and right sides in FIG. Further, the X axis extends in the front-rear direction, and the Z axis extends in the left-right direction.

  The internal grinding machine has a rectangular bed 11 installed on the floor F in the left-right direction, a cutting table 12 supported on the upper left portion of the bed 11 so as to be movable in the X-axis direction, and the cutting table 12 Is supported by the headstock 13 and extends in the Z-axis direction, the chuck 15 is provided at the right end of the spindle 14 and holds the workpiece W in a freely releasable manner, and the Z-axis at the upper right portion of the bed 11 A table 16 supported movably in the direction, a grinding wheel shaft 18 supported on a grinding wheel base 17 mounted on the table 16 and extending in the Z-axis direction, and a grinding wheel 19 attached to the left end of the grinding wheel shaft 18 And a vertical swing arm 21 supported on the front surface of the grindstone platform 17, and a danger prevention cover 22 fixed to the tip of the arm 21 so as to protrude rearward.

  FIG. 1 shows a state in which the grindstone 19 is positioned at the non-grinding position by a solid line. The position of the grindstone 19 that enables the table 16 to move to the left from the non-grinding position and grind the workpiece W held on the chuck 15 is the grinding position.

  The arm 21 is rotatable between a horizontally left state (shown by a solid line in FIG. 2) and a vertically upward state. When the arm 21 is in the horizontally left state, the cover 22 is positioned at the cover position, and when the arm 21 is in the vertically upward state, the cover 22 is positioned at the non-cover position.

  The cover 22 includes an L-shaped body wall 31 and a vertical plate-like side wall 32 connected to the left edge of the body wall 31. With the cover 22 positioned at the cover position, the body wall 31 covers a portion from the upper surface on the outer peripheral surface side of the grindstone 19 to the front surface, and the side wall 32 covers the tip surface of the grindstone 19 from the left side.

  A work holding member 41 is provided on the side wall 32 so as to protrude leftward. The work holding member 41 has a horizontal round bar shape concentric with the grindstone shaft 18 and can be fitted to the inner surface of the work W.

  Next, the grinding method will be described. Hereinafter, the leftward movement of the table 16 is referred to as forward movement (different from the previous and subsequent definitions), and the rightward movement is referred to as backward movement.

  As shown in FIG. 3 (a), the workpiece W held on the spindle 14 is ground with the grindstone 19 positioned at the grinding position and the cover 22 positioned at the non-cover position. When grinding of the workpiece W is completed, as shown in FIG. 3B, the table 16 is moved backward while the cover 22 is positioned at the non-cover position, and the grindstone 19 is moved from the grinding position to the non-grinding position. With the grindstone 19 positioned at the non-grinding position, the arm 21 is turned downward to move the cover 22 from the non-covering position to the cover position. Thereafter, as shown in FIG. 3C, the table 16 is advanced to move the grindstone 19 from the non-grinding position toward the grinding position. During this time, immediately before the grindstone 19 reaches the grinding position, the workpiece W holding member 41 is fitted to the workpiece W that has been ground, the holding of the workpiece W by the chuck 15 is released, and the workpiece W is held by the workpiece W holding member 41. Hold. Thereafter, as shown in FIG. 3 (d), the table 16 is moved backward to move the grindstone 19 to the non-grinding position. The operations shown in FIGS. 3A to 3D are performed by an automatic cycle.

  When the operations shown in FIGS. 3A to 3D are completed, the following operations are performed manually by an operator. When the grindstone 19 moves to the non-grinding position, as shown in FIG. 3 (e), the workpiece W to be ground next is carried into the grinding machine and held by the chuck 15, and the workpiece of the workpiece W after grinding is finished. The holding by the W holding member 41 is released and it is carried out of the grinding machine. The loading / unloading operation can be performed in one cycle. As shown in FIG. 3 (f), the arm 21 is turned upward to move the cover 22 from the cover position to the non-cover position, and the table 16 is advanced to move the grindstone 19 from the non-grinding position to the grinding position. . When the state shown in FIG. 3 (a) is reached again, the grinding operation by the automatic cycle is resumed.

  In addition, this invention is not limited to the above-mentioned embodiment. In the above-described embodiment, the headstock moves in the X-axis direction and the grindstone table moves in the Z-axis direction. However, the headstock moves in the Z-axis direction and the grindstone table moves in the X-axis direction. However, either the headstock or the grindstone head may move to both the X axis and the Z axis. In short, as long as the headstock and the grindstone table move relative to the X axis and the Z axis, good. Further, the turning direction of the grindstone cover may turn sideways (for example, forward) in addition to the form of turning upward from the cover position.

  Further, not only when the workpiece is removed, the operator may receive the workpiece after grinding by hand, while attaching the workpiece to the grinding wheel cover and moving the grinding wheel base to the grinding position to attach the workpiece to the chuck. .

It is a top view of the grinding machine by this invention. It is a front view of the grinding machine. It is grinding operation explanatory drawing by the same grinding machine.

Explanation of symbols

14 Spindle
19 Whetstone
16 tables
21 arm
22 Cover W Work

Claims (2)

  A main spindle that rotatably holds a work, a grindstone that grinds the work held by the main spindle, a grindstone moving means that moves the grindstone between a grinding position and a non-grinding position separated from the grindstone axis direction, and a grindstone A grindstone cover that is moved in the axial direction of the grindstone, a cover moving means that moves the grindstone cover between a cover position where the grindstone cover covers the grindstone and a non-cover position where the grindstone is exposed, and the grindstone cover is located at the cover position A grinding machine provided with a workpiece holding member provided on a grindstone cover so that the workpiece can be held in a state. The grinding machine according to claim 1, wherein the work holding member is formed in a shape that projects from the grindstone cover in parallel with the rotation axis of the main shaft and can be fitted to the inner surface of the work.

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