Copy grinding machine

Abstract

Workpieces can be ground with high precision. [Solution] The device comprises a work support mechanism that supports a workpiece, a grinding wheel support mechanism that supports a grinding wheel that grinds the workpiece, a light source that irradiates light onto the workpiece, and a projector that includes a projection screen that projects the shadows of the grinding wheel and the workpiece, wherein the grinding wheel support mechanism includes a pivot shaft portion that is configured to be rotatable around a direction that follows the projection direction of the light source, and a grinding wheel support portion that supports the grinding wheel so that the grinding wheel is positioned vertically below the pivot shaft portion, and is configured to support the grinding wheel so that the center of rotation of the grinding wheel and the tip of the grinding wheel on the workpiece side are positioned within the projection range projected on the projection screen.

Description

[Technical Field]

[0001] The present invention relates to a profile grinding machine. [Background technology]

[0002] Conventionally, there is a copy grinding machine having a base part, a work unit provided on one side of the base part with a work table for gripping a workpiece, and a grinding wheel unit provided on the other side of the base part with a grinding wheel rotation mechanism for holding a grinding wheel and rotating it around its axis (for example, Patent Document 1).

[0003] The work unit supports a work table and includes first to third moving means for moving the work table in the X and Y directions that intersect with each other in a horizontal plane and in the Z direction that is perpendicular to the horizontal plane without rotating the work table. The grinding wheel unit is provided with a turning mechanism, and is configured to align the center position of the tip of the grinding wheel with the rotation center axis of the turning mechanism and to turn the grinding wheel around the rotation center axis of the turning mechanism.

[0004] The profile grinding machine described in Patent Document 1 has an imaging mechanism that includes a camera that is provided above the base and captures images of the work unit and grinding wheel unit from above, and a camera illuminator that is placed on the base side opposite the camera. A profile grinding machine with such a configuration can perform grinding of a workpiece with high precision. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 4550773 Summary of the Invention [Problem to be solved by the invention]

[0006] The profile grinding machine described in Patent Document 1 is a form grinding machine that grinds the workpiece without rotating the workpiece itself, but in recent years there has been a growing need to perform high-precision grinding even with cylindrical grinding machines that rotate a cylindrical workpiece and grind the outer surface of the workpiece.

[0007] However, there are no cylindrical grinding machines that are equipped with an imaging mechanism or the like and are capable of copy machining, and installing a cylindrical grinding device on a conventional copy grinding machine poses the following problems: First, when the grinding wheel turning mechanism is provided below the grinding wheel (on the base side) as in the copy grinding machine described in Patent Document 1, there is a risk that the grinding wheel turning mechanism will interfere with the work unit or base when the grinding wheel is turned.

[0008] Furthermore, if one tries to avoid the above, the profile grinding machine will become larger, which will increase the installation space, deteriorate workability, and increase costs.

[0009] One aspect of the present invention is a profile grinding machine capable of grinding a workpiece with high precision. [Means for solving the problem]

[0010] A copy grinding machine according to one aspect of the present invention includes a workpiece support mechanism that supports a workpiece, a grinding wheel support mechanism that supports a grinding wheel that grinds the workpiece, a light source that irradiates light onto the workpiece, and a projector that includes a projection screen that projects the shadows of the grinding wheel and the workpiece, wherein the grinding wheel support mechanism includes a pivot shaft portion that is configured to be rotatable about a direction along the projection direction of the light source, and a grinding wheel support portion that supports the grinding wheel so that the grinding wheel is positioned vertically below the pivot shaft portion, and is configured to support the grinding wheel so that the center of rotation of the grinding wheel and the tip of the grinding wheel on the workpiece side are positioned within the projection range projected on the projection screen.

[0011] According to one aspect of the copy grinding machine of the present invention, the grinding wheel is supported so that the center of rotation of the grinding wheel and the tip of the grinding wheel on the workpiece side are located within the projection range shown on the projection screen. Therefore, even when the grinding wheel is rotated, the tip of the grinding wheel on the workpiece side does not move out of the projection range and can be confirmed at all times, allowing the workpiece to be ground with high precision. [Effects of the Invention]

[0012] According to a profile grinding machine according to one aspect of the present invention, a workpiece can be ground with high precision. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a schematic view showing a profile grinding machine according to an embodiment of the present invention. [Figure 2] FIG. 2 is a side view showing the profile grinding machine of this embodiment. [Figure 3] FIG. 3 is a plan view showing the workpiece support mechanism of this embodiment. [Figure 4] FIG. 4 is a plan view showing a state in which the workpiece support mechanism of this embodiment supports a workpiece. [Figure 5] FIG. 5 is an enlarged view showing a part of the table of this embodiment. [Figure 6] FIG. 6 is a schematic diagram showing the optical configuration of the projector of this embodiment. [Figure 7] FIG. 7 is a cross-sectional view showing the workpiece supporting mechanism and the light source of this embodiment. [Figure 8] FIG. 8 is a schematic diagram showing the imaging range of this embodiment. [Figure 9] FIG. 9 is a diagram showing the rotation range of the grindstone in this embodiment. [Figure 10] FIG. 10 is a diagram showing the back and forth movement of the grindstone in this embodiment. [Figure 11] FIG. 11 is a schematic diagram showing the grindstone support mechanism of this embodiment. [Figure 12] FIG. 12 is a schematic view showing the pivot shaft and the grindstone support of this embodiment. [Figure 13]FIG. 13 is a schematic diagram showing the grindstone support mechanism of this embodiment. [Figure 14] FIG. 14 is a schematic diagram showing the pivot shaft and the grindstone support of this embodiment. [Figure 15] FIG. 15 is a side view showing the linear motion mechanism of this embodiment. [Figure 16] FIG. 16 is a diagram showing the back and forth movement of the grindstone support and grindstone of this embodiment. [Figure 17] FIG. 17 is a diagram showing the turning of the grindstone in this embodiment when the turning center of the grindstone and the tip end on the workpiece side are separated. DETAILED DESCRIPTION OF THE INVENTION

[0014] The best mode for carrying out the present invention will be described below with reference to the drawings. Note that the following embodiments do not limit the inventions according to the claims, and not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention.

[0015] [Overall configuration of the profile grinding machine according to this embodiment] Fig. 1 is a schematic diagram showing a profile grinding machine according to an embodiment of the present invention, and Fig. 2 is a side view showing the profile grinding machine of this embodiment. First, a profile grinding machine 1 according to an embodiment of the present invention will be outlined with reference to Figures 1 and 2. As shown in Figures 1 and 2, the profile grinding machine 1 according to this embodiment generally comprises a workpiece support mechanism 10 that supports a workpiece W, a grinding wheel support mechanism 100 that supports a grinding wheel 80 that grinds the workpiece W, and a projector 50. The profile grinding machine 1 also comprises a mounting table 2 on which the workpiece support mechanism 10 and the grinding wheel support mechanism 100 are mounted.

[0016] The workpiece support mechanism 10 includes a table 12 and a workpiece support part 14. Furthermore, the workpiece support mechanism 10 is equipped with a movement mechanism (not shown) that moves the table 12 in the longitudinal direction of the table 12 (in this embodiment, the X-axis direction) and in the lateral direction of the table 12 (in this embodiment, the Y-axis direction). The table 12 is provided on a mounting table 2.

[0017] FIG. 3 is a plan view showing the workpiece support mechanism of this embodiment. The workpiece support unit 14 is attached to the table 12 and is configured to be able to support a cylindrical workpiece W. Specifically, as shown in Fig. 3, the workpiece support unit 14 includes a headstock 16 that rotatably supports one end of the cylindrical workpiece W, and a tailstock 18 that rotatably supports the other end of the cylindrical workpiece W. In other words, the profile grinding machine 1 according to this embodiment functions as a cylindrical grinding machine.

[0018] FIG. 4 is a plan view showing a state in which the workpiece support mechanism of this embodiment supports a workpiece. 4, the workpiece support portion 14 supports the workpiece W so that the portion to be ground of the workpiece W is located closer to the grinding wheel 80 than the edge 12a of the table 12. In this embodiment, "the portion to be ground of the workpiece W is located closer to the grinding wheel 80 than the edge 12a of the table 12" means that the workpiece W protrudes further toward the back of the profile grinding machine 1 (toward the projector 50) than the edge 12a of the table 12 in a direction (Y-axis direction in this embodiment) that is perpendicular and horizontal to the direction in which the headstock 16 and the tailstock 18 face each other (X-axis direction in this embodiment).

[0019] FIG. 5 is an enlarged view showing a part of the table of this embodiment. 3 and 5, the work support part 14 placed on the table 12 is configured to move in accordance with the movement of the table 12 in the X-axis and Y-axis directions on the mounting table 2 by the movement mechanism of the work support mechanism 10. In other words, the work support part 14 is configured to be able to position the work W in the X-axis and Y-axis directions.

[0020] For example, when grinding the tailstock 18 side of the workpiece W, the table 12 can be moved in the X-axis direction so that the tailstock 18 approaches the grinding wheel 80 and the light source 52 of the projector 50, which will be described later, as shown in FIG. 4, and when grinding the headstock 16 side of the workpiece W, the table 12 can be moved in the X-axis direction so that the headstock 16 approaches, as shown in FIG. 5.

[0021] In Figures 3 and 4, the workpiece W is supported at a position away from the grinding wheel 80 and the light source 52 to make the figures easier to see, but this is not limited to this.As shown in Figure 5, it is also possible to position the workpiece W in the Y-axis direction using the movement mechanism of the workpiece support mechanism 10, thereby bringing it closer to the light source 52.

[0022] FIG. 6 is a schematic diagram showing the optical configuration of the projector of this embodiment. 6, the projector 50 includes a light source 52 that irradiates the workpiece W with light, and a projection screen 55 that projects the shadows of the grinding wheel 80 and the workpiece W. In this embodiment, the projector 50 includes a camera 56. The projector 50 also includes a display unit 54 that displays the projection screen 55.

[0023] In this embodiment, the projector 50 has two cameras 56. Specifically, the projector 50 has a low-magnification camera mechanism 60 that captures projected images of the grinding wheel 80 and the workpiece W generated by irradiation from the light source 52, a beam splitter 57 provided on the optical path of the projected images, and a high-magnification camera mechanism 70 that captures the projected images (shadows) of the grinding wheel 80 and the workpiece W split by the beam splitter 57 in a narrower range than the low-magnification camera mechanism 60 and at a higher magnification than the low-magnification camera mechanism 60.

[0024] The projector 50 also includes a relay lens 58 and a reflecting mirror 59 between the workpiece W and the beam splitter 57, which transmit the projected image (shadow) of the grinding wheel 80 and the workpiece W generated by irradiation from the light source 52 to the beam splitter 57. Furthermore, the projector 50 may be provided with various lenses (condenser lens group), dustproof glass, etc., between the light source 52 and the grinding wheel 80 and the workpiece W, as needed. The relay lens 58 may be a lens group consisting of multiple lenses.

[0025] In this embodiment, the projector 50 further includes a housing 51, as shown in Fig. 1. As shown in Fig. 2, the housing 51 is provided above a base 120 (described later) of the grindstone support mechanism 100. The housing 51 also has a low-magnification camera mechanism 60, a high-magnification camera mechanism 70, a beam splitter 57, a relay lens 58, and a reflecting mirror 59 attached thereto. Furthermore, a display unit 54 is attached to the front surface of the housing 51.

[0026] FIG. 7 is a cross-sectional view showing the workpiece supporting mechanism and the light source of this embodiment. The light source 52 is an LED or the like that irradiates a light beam BM toward the workpiece W (in this embodiment, toward the Z-axis direction perpendicular to the X-axis and Y-axis), and is attached in a hole provided in the mounting table 2. In this embodiment, the light source 52 is provided on the far side in the Y-axis direction (toward the grinding wheel 80) than the edge 12a of the table 12, as shown in FIGS.

[0027] The display unit 54 has a display as a display device, and in addition to displaying the projection screen 55, has a screen display function that is normally required for the profile grinding machine 1. The projection screen 55 displays a low-magnification image captured by a low-magnification camera 62 (described later) and a high-magnification image captured by a high-magnification camera 72 (described later).

[0028] In this embodiment, the beam splitter 57 is disposed at a position where a projected image of the grinding wheel 80 and workpiece W generated by irradiation from the light source 52 is formed. The relay lens 58 and the reflecting mirror 59 are disposed opposite the light source 52 across the workpiece W, and are configured to cooperate with each other to form a projected image of the grinding wheel 80 and workpiece W on the beam splitter 57. In this way, in this embodiment, the projected image is formed within the beam splitter 57, and thereby an intermediate focus is formed on the optical path between the grinding wheel 80 and workpiece W and the low-magnification camera mechanism 60 and / or the high-magnification camera mechanism 70.

[0029] However, the present invention is not limited to this, and any optical path configuration may be used as long as the images of the grinding wheel 80 and the workpiece W are ultimately formed on the low-magnification camera mechanism 60 and the high-magnification camera mechanism 70. From this perspective, the position at which the beam splitter 57 is disposed is not particularly limited as long as it is located closer to the grinding wheel 80 and the workpiece W than the low-magnification camera mechanism 60 and the high-magnification camera mechanism 70. For example, instead of a configuration using an intermediate focus at an intermediate position including the beam splitter 57, a configuration in which the optical path is adjusted to collimated collimated light by the beam splitter 57 may be used.

[0030] In this embodiment, the beam splitter 57 is disposed between the reflecting mirror 59 and the low-magnification camera mechanism 60 and the high-magnification camera mechanism 70, and includes a transmitted light exit surface that splits and transmits the formed projection image (optical path), and a reflected light exit surface that changes the direction of the formed projection image (optical path) and reflects and splits it. The beam splitter 57 may be, for example, a half mirror or a partial mirror. The projector 50 according to this embodiment is configured to include such a beam splitter 57, thereby enabling the low-magnification camera mechanism 60 and the high-magnification camera mechanism 70 to simultaneously observe the same area (projected image) at different magnifications.

[0031] Furthermore, the projector 50 further includes a reflected image light source and a reflected image beam splitter. Note that the reflected image light source and the reflected image beam splitter according to this embodiment can employ various known configurations, and therefore detailed description thereof will be omitted.

[0032] The low-magnification camera mechanism 60 is configured to capture either a projected image that has passed through the beam splitter 57 and been split, or a projected image that has been reflected and split. Specifically, as shown in Fig. 5, the low-magnification camera mechanism 60 includes a low-magnification camera 62 and a low-magnification imaging lens 64 that transmits the projected image that has passed through the beam splitter 57 and been split to the low-magnification camera 62. Note that in the example shown in the figure, the low-magnification imaging lens 64 and the low-magnification camera 62 are arranged to face the transmitted light exit surface of the beam splitter 57, but this is not limitative and various other arrangements are possible, and it is also possible to add appropriate components such as a reflecting means depending on the arrangement.

[0033] The low-magnification imaging lens 64 is configured to enlarge or reduce the projected image that has passed through the beam splitter 57 and been split at a predetermined magnification, and to form this enlarged or reduced projected image (low-magnification projected image) on the low-magnification camera 62. The low-magnification imaging lens 64 may be a lens group (low-magnification imaging lens group) made up of multiple lenses. The magnification of the low-magnification imaging lens 64 can be set arbitrarily as long as it is a magnification that can capture a relatively wide range of the processing range of the workpiece W, and can be set, for example, to approximately 0.3 to 1 times the actual size of the grinding wheel 80 and workpiece W. The magnification of the low-magnification imaging lens 64 may be arbitrarily changed by switching or adding or removing the lenses used.

[0034] The low-magnification camera 62 is configured to be able to capture a low-magnification projection image formed by the low-magnification imaging lens 64. As the low-magnification camera 62, any of various known imaging means can be adopted, such as a CMOS sensor, a CCD sensor, an array sensor, or an image pickup tube. Furthermore, image data of the low-magnification projection image captured by the low-magnification camera 62 is displayed on the projection screen 55 of the display unit 54 as a low-magnification image.

[0035] FIG. 8 is a schematic diagram showing the imaging range of this embodiment. 6 and 8, the low-magnification camera 62 is configured to be able to photograph the tip 82 of the grinding wheel 80 on the workpiece W side through an opening 150 (described later) of a pivot shaft 140 (described later) of the grinding wheel support mechanism 100. Specifically, in this embodiment, the relay lens 58 and the reflecting mirror 59 are arranged on an extension of the opening 150 of the pivot shaft 140 as shown in Fig. 6, and are configured to reflect a light ray BM that has passed through the opening 150 toward the low-magnification camera mechanism 60, thereby enabling the low-magnification camera 62 to photograph the tip 82 of the grinding wheel 80 on the workpiece W side through the opening 150.

[0036] 8, the low-magnification camera 62 is disposed so that the center of rotation TC of the grinding wheel 80 is located away from the center of the image capturing range F. Specifically, as shown in FIG. 8, the image capturing range F is configured as a horizontally long rectangle, and the optical system of the projector 50 is positioned so that the center of rotation TC of the grinding wheel 80 is located away from the center of the image capturing range F in the height direction (short axis direction) of the image capturing range F. In this embodiment, the optical system of the projector 50 is positioned so that the center of rotation TC of the grinding wheel 80 is located one-third of the way from the top end of the image capturing range F. In other words, the grinding wheel 80 is captured in approximately one-third of the image capturing range F. However, the present invention is not limited to this.

[0037] 8, the tip 82 of the grinding wheel 80 on the workpiece W side coincides with the center of rotation TC of the grinding wheel 80, but the tip 82 and the center of rotation TC do not necessarily coincide, as will be described later. Therefore, although the positional relationship between the optical system of the projector 50 and the center of rotation TC of the grinding wheel 80 does not change, the range of the grinding wheel 80 located within the imaging range F may change due to wear of the grinding wheel 80, etc.

[0038] The high-magnification camera mechanism 70 is configured to capture the other (the one different from the low-magnification camera mechanism 60) of the projected image that is transmitted through and split by the beam splitter 57 and the projected image that is reflected and split. Specifically, as shown in Fig. 5, the high-magnification camera mechanism 70 includes a high-magnification imaging lens 74 that magnifies the projected image that is reflected and split by the beam splitter 57 at a predetermined magnification, and a high-magnification camera 72 that captures the projected image (high-magnification projected image) magnified by the high-magnification imaging lens 74.

[0039] The high-magnification camera mechanism 70 also includes a reflector 76 that reflects the high-magnification projected image magnified by the high-magnification imaging lens 74 toward the high-magnification camera 72. In the illustrated example, the high-magnification imaging lens 74 is disposed opposite the reflected light exit surface of the beam splitter 57, and the high-magnification camera 72 is disposed facing in a direction perpendicular to the opposing direction, but this is not limitative and various arrangements are possible, and the reflector 76 can also be added or removed depending on the arrangement.

[0040] The high-magnification imaging lens 74 is configured to magnify the projected image reflected and split by the beam splitter 57 at a predetermined magnification, and form a high-magnification projected image on the high-magnification camera 72. The high-magnification imaging lens 74 may be a lens group (high-magnification imaging lens group) made up of a plurality of lenses. The magnification of the high-magnification imaging lens 74 is set to be higher than the magnification of the low-magnification imaging lens 64. This magnification can be set arbitrarily within a range that allows pinpoint capture of the workpiece W, and can be set to, for example, a magnification that allows magnification of approximately 5 to 10 times the actual grinding wheel 80 and workpiece W. The magnification of the high-magnification imaging lens 74 may be arbitrarily changed by switching or adding or removing the lenses used.

[0041] The high-magnification camera 72 is configured to be able to capture a high-magnification projection image magnified and formed by the high-magnification imaging lens 74. As the high-magnification camera 72, any of various known imaging means can be adopted, such as a CMOS sensor, a CCD sensor, an array sensor, or an image pickup tube. The high-magnification projection image captured by the high-magnification camera 72 is displayed on the projection screen 55 of the display unit 54 as a high-magnification image.

[0042] FIG. 9 is a diagram showing the rotation range of the grindstone in this embodiment. 1 and 9, the grinding wheel 80 has a substantially disk shape, and is rotatably supported by a grinding wheel support portion 160 (described later) of the grinding wheel support mechanism 100 via a grinding wheel shaft 84 attached to the center of one surface. In this embodiment, the grinding wheel 80 is configured to be rotatable, as shown in Fig. 9. Specifically, the grinding wheel 80 is configured to be rotatable in the axial direction of the grinding wheel shaft 84 about a rotation center TC as a rotation shaft portion 140 (described later) of the grinding wheel support mechanism 100 rotates.

[0043] FIG. 10 is a diagram showing the back and forth movement of the grindstone in this embodiment. 10, the grinding wheel 80 is configured to be movable along the radial direction of the grinding wheel 80 (a direction perpendicular to the axial direction of the grinding wheel shaft 84). Specifically, the grinding wheel 80 is configured to be movable relative to the swivel shaft 140 by the grinding wheel support part 160 of the grinding wheel support mechanism 100 along a direction approaching or moving away from the workpiece W.

[0044] FIG. 11 is a schematic diagram showing the grindstone support mechanism of this embodiment. 11, the grindstone support mechanism 100 includes a pivot shaft 140 and a grindstone support part 160 that supports the grindstone 80 so that the grindstone 80 is positioned vertically below the pivot shaft 140. The grindstone support mechanism 100 also includes a base part 120 that pivotally supports the pivot shaft 140.

[0045] FIG. 12 is a schematic view showing the pivot shaft and the grindstone support of this embodiment. As shown in FIGS. 8, 11, and 12, the grinding wheel support mechanism 100 is configured to support the grinding wheel 80 so that the rotation center TC of the grinding wheel 80 and the tip 82 of the grinding wheel 80 on the workpiece W side are positioned within a projection range (in this embodiment, the shooting range F of the camera 56) projected on the projection screen 55. A specific configuration of the grinding wheel support mechanism 100 according to this embodiment will be described below. First, as shown in FIG. 2, the base 120 has a first frame portion 122 and a second frame portion 124 extending forward (to the left in FIG. 2) from the first frame portion 122. In this embodiment, the first frame portion 122 and the second frame portion 124 of the base 120 are integrally configured. However, this is not limited thereto, and the first frame portion 122 and the second frame portion 124 may be separately configured, with the second frame portion 124 attached to the first frame portion 122.

[0046] The first frame portion 122 stands upright behind the mounting table 2. Specifically, in this embodiment, the first frame portion 122 is disposed behind a hole provided in the mounting table 2 for attaching the light source 52. However, this is not limitative. The second frame portion 124 is provided in front of the upper end portion of the first frame portion 122, and is provided with an attachment hole (not shown) for rotatably attaching the pivot portion 140. The attachment hole is provided in a position facing the light source 52 (or the hole in the mounting table 2 for attaching the light source 52). The housing 51 of the projector 50 is attached to the upper portions of the first frame portion 122 and the second frame portion 124.

[0047] Fig. 13 is a schematic diagram showing the grindstone support mechanism of this embodiment, and Fig. 14 is a schematic diagram showing the swivel shaft and grindstone support of this embodiment. As shown in Fig. 12, the pivot shaft 140 has an opening 150 in the center. Also, as shown in Figs. 12 and 14, the pivot shaft 140 has a base 142 for attaching a grindstone support 160. As shown in Fig. 13, the peripheral edge of the opening 150 of the pivot shaft 140 is rotatably supported by an attachment hole of the second frame portion 124 via a roller gear cam mechanism 144. That is, the opening 150 is disposed opposite the light source 52, as shown in Figs. 2 and 6.

[0048] Furthermore, the pivot shaft 140 is configured to be rotatable around a direction along the projection direction of the light source 52 by a roller gear cam mechanism 144. In this embodiment, the pivot shaft 140 is configured to be rotatable around a direction (Z-axis direction) along the irradiation direction of the light beam BM of the light source 52. The roller gear cam mechanism 144 is configured such that, by driving the pivot shaft drive motor 146, the rotation of a roller gear (not shown) attached to the pivot shaft drive motor 146 is transmitted to a roller follower (not shown), causing the pivot shaft 140 attached to the roller follower to rotate.

[0049] The pivot shaft unit 140 having the above configuration has a pivot center located one-third of the way from the top of the imaging range F. In this embodiment, the center of the opening 150 is slightly offset from the pivot center of the pivot shaft unit 140. However, this is not limiting, and the pivot center of the pivot shaft unit 140 may coincide with the center of the opening 150.

[0050] FIG. 16 is a diagram showing the back and forth movement of the grindstone support and grindstone of this embodiment. 14 and 16, the grinding wheel support part 160 is attached to the swivel shaft part 140 and is configured to support the grinding wheel 80 so that the tip part 82 of the grinding wheel 80 on the workpiece W side is positioned within the projected area of ​​the opening 150. Specifically, the grinding wheel support part 160 has a grinding wheel spindle 162 including a grinding wheel drive motor for rotating the grinding wheel 80 during grinding, and a linear motion mechanism 170.

[0051] The grindstone spindle 162 is attached to the base 142 of the pivot shaft 140 via a linear motion mechanism 170, and its tip is configured to be able to support the grindstone 80. In this embodiment, the grindstone spindle 162 preferably supports the grindstone 80 so that the center of the grindstone 80 in its thickness direction (the axial direction of the grindstone shaft 84) coincides with the rotation center of the pivot shaft 140. When the center of the grindstone 80 in its thickness direction coincides with the rotation center of the pivot shaft 140 and further when the tip 82 of the grindstone 80 on the workpiece W side coincides with the rotation center of the pivot shaft 140, the rotation center TC of the grindstone 80 coincides with the tip 82 of the grindstone 80 on the workpiece W side, and the grindstone 80 rotates in accordance with the rotation of the pivot shaft 140, with the tip 82 on the workpiece W side serving as the rotation center TC. Since the center of rotation TC of the grinding wheel 80 coincides with the tip 82 of the grinding wheel 80 on the workpiece W side, the tip 82 on the workpiece W side does not move even when the grinding wheel 80 is rotated, as shown in Figure 9, and therefore can always be located in the same position within the shooting range F (one-third of the way from the top end of the shooting range F).

[0052] However, this is not limited to this. The grinding wheel spindle 162 only needs to support the grinding wheel 80 so that at least the tip 82 of the grinding wheel 80 on the workpiece W side is positioned within the projected area of ​​the opening 150. With this configuration, the grinding wheel 80 is supported vertically above the light source 52 and facing the light source 52. Furthermore, no matter in which direction the grinding wheel 80 is rotated, the rotation center TC of the grinding wheel 80 and the tip 82 of the grinding wheel 80 on the workpiece W side can always be positioned within the projection range (photographing range F) projected on the projection screen 55.

[0053] FIG. 17 is a diagram showing the turning of the grindstone in this embodiment when the turning center of the grindstone and the tip end on the workpiece side are separated. As described above, it is preferable that the tip 82 of the grinding wheel 80 on the workpiece W side coincides with the center of rotation TC of the grinding wheel 80, but this does not necessarily happen depending on the size, precision, wear, etc. of the grinding wheel 80. For example, if the tip 82 of the grinding wheel 80 on the workpiece W side does not coincide with the center of rotation TC of the grinding wheel 80, the position of the tip 82 on the workpiece W side will also move when the grinding wheel 80 is rotated, as shown in FIG.

[0054] In such a case, the profile grinding machine 1 may perform tip point control. In this embodiment, tip point control means controlling so that the tip 82 of the grinding wheel 80 on the workpiece W side and the grinding portion of the workpiece W do not move relative to each other when the grinding wheel 80 is rotating. Specifically, the profile grinding machine 1 moves the workpiece support part 14 that supports the workpiece W using the movement mechanism of the workpiece support mechanism 10 so that it follows the tip 82 of the grinding wheel 80 on the workpiece W side, which moves when the grinding wheel 80 is rotating. In this way, the profile grinding machine 1 can control the grinding wheel 80 so that it rotates around the tip 82 of the grinding wheel 80 on the workpiece W side relative to the workpiece W.

[0055] The shape, size, and mounting position of the grinding wheel spindle 162 on the base portion 142 can be any of a variety of configurations that can support the grinding wheel 80 so that the tip portion 82 of the grinding wheel 80 on the workpiece W side is positioned within the projected area of ​​the opening 150.

[0056] FIG. 15 is a side view showing the linear motion mechanism of this embodiment. As shown in FIG. 15, the linear motion mechanism 170 has a track rail 172 attached to the underside 142a of the base portion 142, a slide unit 174 attached to the grinding wheel spindle 162 and supported movably on the track rail 172, and a linear motion motor 176 for moving the slide unit 174.

[0057] The track rail 172 is attached to the underside 142a of the base portion 142 so as to extend in a direction (Y-axis direction) perpendicular to the extension direction of the grinding wheel spindle 162, and is configured so that by driving the linear motion motor 176, the slide unit 174, and therefore the grinding wheel spindle 162, moves along the Y-axis direction relative to the revolving shaft portion 140. The grinding wheel support portion 160 having such a configuration is configured so that the grinding wheel 80 supported by the grinding wheel spindle 162 can move relative to the revolving shaft portion 140 along a direction approaching or moving away from the workpiece W, as shown in Figures 15 and 16 .

[0058] That is, when the tip 82 of the grinding wheel 80 on the workpiece W side is away from the rotation center TC of the grinding wheel 80 as shown in Fig. 10(a), the grinding wheel support part 160 can move the tip 82 closer to the rotation center TC as shown in Fig. 10(b). Note that the grinding wheel support part 160 does not need to have the linear motion mechanism 170, and various arbitrary configurations can be adopted as long as it is configured to be able to move the grinding wheel 80 relative to the rotation shaft part 140 in the direction approaching or moving away from the workpiece W.

[0059] [Advantages of the profile grinding machine according to this embodiment] As described above, the copy grinding machine 1 of this embodiment is equipped with a work support mechanism 10 that supports the workpiece W, a grinding wheel support mechanism 100 that supports the grinding wheel 80 that grinds the workpiece W, a light source 52 that irradiates light onto the workpiece W, and a projector 50 that includes a projection screen 55 that projects the shadows of the grinding wheel 80 and the workpiece W. The grinding wheel support mechanism 100 includes a pivot shaft portion 140 that is configured to be rotatable around a direction along the projection direction of the light source 52, and a grinding wheel support portion 160 that supports the grinding wheel 80 so that the grinding wheel 80 is positioned vertically below the pivot shaft portion 140, and is configured to support the grinding wheel 80 so that the pivot center TC of the grinding wheel 80 and the tip portion 82 of the grinding wheel 80 on the workpiece W side are positioned within the projection range projected on the projection screen 55.

[0060] Furthermore, by having such a configuration, the copy grinding machine 1 of this embodiment supports the grinding wheel 80 so that the center of rotation TC of the grinding wheel 80 and the tip 82 of the grinding wheel 80 on the workpiece W side are positioned within the projection range projected on the projection screen 55. Therefore, even when the grinding wheel 80 is rotated, the tip 82 of the grinding wheel 80 on the workpiece W side does not move out of the projection range and can be confirmed at all times, which has the advantage that the workpiece W can be ground with high precision.

[0061] Furthermore, in the copy grinding machine 1 according to this embodiment, the grinding wheel 80 is supported so that it is positioned vertically below the swivel shaft portion 140, so there is no risk of the grinding wheel support mechanism 100 interfering with a cylindrical workpiece W or the like, and this has the advantage that the workpiece W can be ground with high precision.

[0062] Furthermore, in the copy grinding machine 1 according to this embodiment, the projector 50 has a camera 56, and the projection range is the photographing range F of the camera 56. With this configuration, the shape of the workpiece W and the tip 82 of the grinding wheel 80 on the workpiece W side can be grasped more accurately than with an optical projector in which a copy chart showing the processed shape of the workpiece W is attached to the projection screen 55 and superimposed on a projected image (shadow) of the workpiece W, which has the advantage of enabling the workpiece W to be ground with higher precision.

[0063] Furthermore, in the copy grinding machine 1 according to this embodiment, the swivel shaft 140 has an opening 150 in the center and is configured to be swivelable around a direction along the projection direction of the light source 52, the grinding wheel support part 160 is configured to support the grinding wheel 80 so that the tip 82 of the grinding wheel 80 on the workpiece W side is positioned within the projected area of ​​the opening 150, and the camera 56 is configured to be able to photograph the tip 82 of the grinding wheel 80 on the workpiece W side through the opening 150 of the swivel shaft 140. With this configuration, the tip 82 of the grinding wheel 80 on the workpiece W side can be confirmed on the projection screen 55, which has the advantage of allowing the workpiece W to be ground with higher precision.

[0064] Furthermore, in the profile grinding machine 1 according to this embodiment, the camera 56 (in this embodiment, the low-magnification camera 62) is positioned so that the rotation center TC of the grinding wheel 80 is located at a position away from the center of the imaging range F. With this configuration, the imaging range of the workpiece W can be enlarged while imaging the vicinity of the tip 82 of the grinding wheel 80 on the workpiece W side, which has the advantage that the grinding portion of the workpiece W can be easily confirmed and the workpiece W can be ground with higher precision.

[0065] Furthermore, in the profile grinding machine 1 according to this embodiment, the grinding wheel support portion 160 is configured to be able to move the grinding wheel 80 relative to the pivot shaft portion 140 in a direction approaching or moving away from the workpiece W. This configuration has the advantage that, when the grinding wheel 80 wears and the diameter of the grinding wheel 80 becomes smaller, the position of the tip portion 82 of the grinding wheel 80 on the workpiece W side can be moved to a position close to the position before wear by moving the grinding wheel 80 relative to the pivot shaft portion 140 in a direction approaching the workpiece W. Furthermore, the position of the tip portion 82 can be adjusted by moving the grinding wheel 80 relative to the pivot shaft portion 140 depending on the diameter of the grinding wheel 80 being used. That is, as long as the grinding wheel 80 has a diameter within an adjustable range (e.g., 150φ to 205φ), the tip portion 82 of the grinding wheel 80 on the workpiece W side can always be positioned within the projected area of ​​the opening 150 of the pivot shaft portion 140, regardless of the diameter of the grinding wheel 80.

[0066] Furthermore, in the profile grinding machine 1 according to this embodiment, the grinding wheel support mechanism 100 includes a base 120 that rotatably supports the swivel shaft 140, and the swivel shaft 140 is supported by the base 120 via a roller gear cam mechanism 144. With this configuration, the positioning accuracy of the tip 82 of the grinding wheel 80 on the workpiece W side is higher than with a configuration that includes a swivel mechanism or the like, which has the advantage of allowing the workpiece W to be ground with higher accuracy.

[0067] Furthermore, in the profile grinding machine 1 according to this embodiment, the work support mechanism 10 includes a table 12 and a work support section 14 that supports the work W so that the portion of the work W to be ground is located closer to the grinding wheel 80 than the edge 12a of the table 12, and the work support section 14 is configured to be able to support a cylindrical work W. With this configuration, a projected image (shadow) of even a cylindrical work W can be projected onto the projection screen 55, which has the advantage of allowing the cylindrical work W to be ground with high precision by profile machining.

[0068] Furthermore, in the profile grinding machine 1 according to this embodiment, the workpiece support section 14 includes a headstock 16 that rotatably supports one end of the cylindrical workpiece W, and a tailstock 18 that rotatably supports the other end of the cylindrical workpiece W. By providing such a configuration, the profile grinding machine has the advantage of being able to grind the cylindrical workpiece W with high precision.

[0069] [Variations] Although the preferred embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the scope described in the above-described embodiments. Various modifications and improvements can be made to the above-described embodiments.

[0070] For example, in the above-described embodiment, the projector 50 has the camera 56, and the projection range is the shooting range F of the camera 56. However, the present invention is not limited to this. The projector 50 does not necessarily have to have the camera 56. In other words, the projector 50 may be an optical projector instead of a digital projector.

[0071] In the above-described embodiment, the pivot shaft 140 has an opening 150 in its center and is configured to be pivotable around a direction parallel to the projection direction of the light source 52, the grinding wheel support 160 is configured to support the grinding wheel 80 so that the tip 82 of the grinding wheel 80 on the workpiece W side is located within the projected area of ​​the opening 150, and the camera 56 is configured to be able to photograph the tip 82 of the grinding wheel 80 on the workpiece W side through the opening 150 of the pivot shaft 140. However, this is not limiting. The pivot shaft 140 does not necessarily have to have the opening 150. For example, the camera 56 may be attached to the center of rotation of the pivot shaft 140. Alternatively, the grinding wheel support 160 may support the grinding wheel 80 so that the tip 82 of the grinding wheel 80 on the workpiece W side is located at the center of rotation of the pivot shaft 140.

[0072] In the above-described embodiment, the camera 56 (in this embodiment, the low-magnification camera 62) is described as being arranged so that the pivot center TC of the grinding wheel 80 is located at a position away from the center of the imaging range F, but this is not limited to this. The camera 56 (low-magnification camera 62) may be arranged so that the pivot center TC of the grinding wheel 80 coincides with the center of the imaging range F or is located near the center of the imaging range F.

[0073] In the above-described embodiment, the grindstone support unit 160 has been described as being configured to be able to move the grindstone 80 relative to the pivot shaft unit 140 along the direction of approaching or moving away from the workpiece W, but this is not limiting. The grindstone support unit 160 does not have to be able to move the grindstone 80 relative to the pivot shaft unit 140 along the direction of approaching or moving away from the workpiece W. In other words, the grindstone support unit 160 does not have to have the linear motion mechanism 170.

[0074] In the above-described embodiment, the grindstone support mechanism 100 includes the base 120 that rotatably supports the swivel shaft 140, and the swivel shaft 140 is supported on the base 120 via the roller gear cam mechanism 144. However, the grindstone support mechanism 100 is not limited to this. Any of a variety of configurations can be adopted for the grindstone support mechanism 100 as long as the swivel shaft 140 is rotatably supported on the base 120.

[0075] In the above-described embodiment, the workpiece support mechanism 10 includes the table 12 and the workpiece support unit 14 that supports the workpiece W so that the grinding portion of the workpiece W is located closer to the grinding wheel 80 than the edge 12a of the table 12, and the workpiece support unit 14 is described as being configured to be able to support a cylindrical workpiece W, but this is not limiting. The workpiece support unit 14 does not have to support the workpiece W so that the grinding portion of the workpiece W is located closer to the grinding wheel 80 than the edge 12a of the table 12. Furthermore, the workpiece support unit 14 does not have to be able to support a cylindrical workpiece W.

[0076] In the above-described embodiment, the workpiece support unit 14 has been described as including the headstock 16 that rotatably supports one end of the cylindrical workpiece W and the tailstock 18 that rotatably supports the other end of the cylindrical workpiece W, but is not limited to this. The workpiece support unit 14 does not have to include the headstock 16 and the tailstock 18. In other words, the profile grinding machine 1 may function as a form grinding machine rather than as a cylindrical grinding machine. When functioning as a form grinding machine, for example, the profile grinding machine 1 may be configured such that the workpiece support mechanism 10 includes an elevating mechanism that can raise and lower the workpiece W in the vertical direction (in the Z-axis direction in this embodiment), allowing grinding to be performed while the workpiece W is being raised and lowered.

[0077] In the above-described embodiment, the projector 50 has been described as having two cameras 56 (a low-magnification camera 62 and a high-magnification camera 72), but this is not limited thereto. The projector 50 may have one camera 56, or may have three or more cameras 56. Furthermore, when the projector 50 has one camera 56, the camera 56 is not limited to being optically opposed to the light source 52 as described above, but may be physically opposed to the light source 52 across the workpiece W. Furthermore, the projector 50 has been described as having the light source 52 attached in a hole formed in the mounting table 2 and the camera 56 attached to the housing 51, but this is not limited thereto. The projector 50 may have the camera 56 provided on the mounting table 2 side, and the light source 52 attached above the workpiece W (for example, inside the housing 51). [Explanation of symbols]

[0078] 1. Profile grinder 2 Mounting table 10 Work support mechanism 12 tables 12a Edge 14 Work support part 16 Headstock 18 Tailstock 50 projector 51 Case 52 Light source 54 Display section 55 Projection screen 56 Camera 57 Beam Splitter 58 Relay Lens 59 Reflector 60 Low magnification camera mechanism 62 Low magnification camera 64 Low magnification imaging lens 70 High-magnification camera mechanism 72 High-magnification camera 74 High magnification imaging lens 76 Reflector 80 Whetstone 82 Tip 84 Grindstone spindle 100 Grindstone support mechanism 120 base 122 First frame section 124 Second frame section 140 Swivel shaft 142 Pedestal 144 Roller gear cam mechanism 146 Rotating shaft drive motor 150 aperture 160 Grindstone support 162 Grindstone spindle 170 Linear motion mechanism 172 Track Rail 174 Slide unit 176 Linear motion motor BM ray F Shooting range TC: Center of rotation of grinding wheel double work

Claims

1. a work support mechanism for supporting the work; a grindstone support mechanism for supporting a grindstone for grinding the workpiece; a light source that irradiates light onto the workpiece, a camera that captures images of the grinding wheel and the workpiece, and a projector that includes a projection screen that displays the image captured by the camera; Equipped with The grindstone support mechanism includes: a pivot shaft configured to be pivotable about a direction along the projection direction of the light source; a grindstone support portion that supports the grindstone so that the grindstone is positioned vertically below the pivot shaft portion; Including, The grinding wheel is supported so that the center of rotation of the grinding wheel and the tip of the grinding wheel on the workpiece side are positioned within the shooting range projected on the projection screen. Copy grinding machine.

2. the pivot shaft portion has an opening at its center and is configured to be pivotable about a direction along the projection direction of the light source, the grindstone support portion is configured to support the grindstone such that the tip portion of the grindstone on the workpiece side is positioned within a projected area of ​​the opening, The camera is configured to be able to photograph the tip of the grindstone on the workpiece side through the opening of the pivot shaft.

2. The profile grinding machine according to claim 1.

3. The camera is disposed so that the center of rotation of the grinding wheel is located at a position away from the center of the imaging range.

3. The profile grinding machine according to claim 1 or 2.

4. The grindstone support portion is configured to be able to move the grindstone relatively to the pivot shaft portion along a direction approaching or moving away from the workpiece.

3. The profile grinding machine according to claim 1 or 2.

5. the grindstone support mechanism includes a base portion that rotatably supports the pivot shaft portion, The pivot shaft is supported by the base via a roller gear cam mechanism.

3. The profile grinding machine according to claim 1 or 2.

6. The workpiece support mechanism includes: A table and a workpiece support portion that supports the workpiece so that the grinding portion of the workpiece is positioned closer to the grinding wheel than the edge of the table; Including, The workpiece support portion is configured to be able to support a cylindrical workpiece.

3. The profile grinding machine according to claim 1 or 2.

7. The workpiece support portion is a headstock that rotatably supports one end of the cylindrical workpiece; a tailstock that rotatably supports the other end of the cylindrical workpiece; Contains 7. The profile grinding machine according to claim 6.

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