JP2018001365A - Grindstone cover device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grindstone cover device which is configured to generate air currents by which processed powder (cut powder) can be exhausted so as to improve performance of exhausting the processed powder (the cut powder) even when using a small-diameter grindstone.SOLUTION: The grindstone cover device uses two types of grindstones with different diameters, a large-diameter grindstone with a large diameter and a small-diameter grindstone 57 with a small diameter; and comprises a large-diameter grindstone cover unit which forms a first inner space S1 for storing the large-diameter grindstone, a small-diameter grindstone cover unit 60S, arranged detachably in the first inner space S1 which is formed by the large-diameter grindstone cover device, which forms a second inner space S2 for storing the small-diameter grindstone 57.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a grindstone cover device. In particular, the present invention relates to a grindstone cover device when two types of large diameter grindstones and small diameter grindstones having different diameters are attached to a grindstone shaft.

  As shown in Patent Literature 1, a grindstone device including a grindstone for grinding a workpiece (camshaft) includes a grindstone cover device that surrounds the grindstone in a grindstone base body. The grindstone cover device covers most of the circumference of the grindstone, leaving an area around the grinding point where the workpiece is ground as an opening.

  In the cam grinder, the chips (processed powder) generated by grinding the grindstone are carried together with the coolant from the discharge port below the grindstone to the clean tank, and the chips are separated by the magnetic separator. Further, the chips that have entered the interior covered with the grindstone cover device are discharged from the opening by riding on the airflow that rotates with the rotating grindstone.

  By the way, the size of the grindstone attached to the grindstone shaft varies depending on the processing conditions of the workpiece (cam). That is, in the cam grinding machine, the size of the diameter varies depending on the cam shape that is a workpiece. When the recess is formed in the cam shape, a relatively small diameter grindstone is used. When the recess is not formed, a relatively large diameter large grindstone is used from the viewpoint of productivity.

  Thus, the grindstone cover device in the cam grinder using two kinds of grindstones is equipped according to the size of the large-diameter grindstone. The small-diameter grindstone is mounted with the grindstone cover device installed in accordance with the size of the large-diameter grindstone, so that one cam grinder can handle a grindstone with a plurality of diameters. Yes.

Japanese Examined Patent Publication No. 62-57465 JP 2005-349523 A

  In the grindstone cover device equipped in accordance with the above-described large-diameter grindstone, there is no particular problem when the large-diameter grindstone is disposed in the grindstone cover device. However, when a small-diameter grindstone is provided, the following problems occur.

  That is, when a large-diameter grindstone is arranged in the grindstone cover device, the space between the outer diameter outer peripheral surface of the large-diameter grindstone and the inner peripheral surface of the grindstone cover device covering it is relatively narrow. Thereby, the airflow in the space is entrained by the rotation of the large-diameter grindstone. Therefore, even if the chips enter the space, they are discharged to the outside by riding on the air flow generated by the rotation of the large-diameter grindstone.

  On the other hand, when cam grinding is performed with a small-diameter grindstone, a large space is formed between the outer peripheral surface of the small-diameter grindstone and the inner peripheral surface of the grindstone cover device that covers it. In the case of a large space, the air flow generated by the rotation of the small diameter grindstone becomes slower as the distance from the small diameter grindstone increases. Therefore, it becomes difficult to discharge chips by the air flow as the distance from the small-diameter grindstone increases. As a result, there is a problem that the chips that enter the large space portion are not discharged but are accumulated in the space portion.

  Further, when the chips accumulated in the space come into contact with the small-diameter grindstone, thermal displacement due to the heat generated by the grindstone may occur, which may cause deterioration in machining accuracy.

  Thus, the present invention was devised in view of the above-described points, and the problem to be solved by the present invention is that an air flow that can discharge machining powder (chip) even when a small-diameter grindstone is used. This is to improve the discharge of processed powder (chip).

  In order to solve the above problems, the present invention takes the following means.

  A grindstone cover device according to the present invention is attached to a grindstone base body that rotatably supports a grindstone shaft, and the grindstone attached to the grindstone shaft is left around the grinding point as an opening, and covers other than the opening. It is a grindstone cover device. And the said grindstone in the said grindstone cover apparatus is a rotary body with a circular cross section, there are two types with different diameters, and is either a large diameter grindstone with a large diameter or a small diameter grindstone with a small diameter, A large-diameter grindstone cover device that forms a first internal space that accommodates the large-diameter grindstone, and is detachably disposed in the first internal space formed by the large-diameter grindstone cover device, and accommodates the small-diameter grindstone. And a small-diameter grindstone cover device that forms a second internal space.

  According to the present invention described above, the large-diameter grindstone is disposed in the first internal space formed by the large-diameter grindstone cover device, and the small-diameter grindstone is disposed in the second internal space formed by the small-diameter grindstone cover device. Is done. The first internal space is formed as a size corresponding to the size of the large-diameter grindstone, and the second internal space is formed as a size corresponding to the size of the small-diameter grindstone. As a result, the airflow in the space between the outer peripheral surface of each grindstone and the inner peripheral surface of each grindstone cover device covering it is entrained by the rotation of each grindstone. As a result, the machining powder that has entered the space is discharged by riding on the airflow generated by the rotation of each grindstone.

  The present invention described above can take the following aspects.

  First, the large-diameter grindstone cover device in the above-described grindstone cover device of the present invention includes a large-diameter opening as the opening, and the large-diameter for enclosing the large-diameter grindstone other than the large-diameter opening. Provide walls. The small-diameter grindstone cover device includes a small-diameter opening as the opening, and includes a small-diameter wall surrounding the small-diameter grindstone other than the small-diameter opening. According to the said structure, except each opening part, it surrounds each grindstone and can produce the airflow which can discharge | emit process powder reliably. The processing powder accumulated inside can be reduced.

  Next, the shielding portion that narrows the entry gap between the small-diameter grindstone and the small-diameter wall can be removed at the small-diameter grindstone rotation position forward position in the small-diameter opening in the above-described grindstone cover device of the present invention. Provided. By providing the shielding portion, it is possible to reduce the amount of processing powder entering the space between the small-diameter grindstone and the small-diameter wall. The processing powder accumulated inside can be reduced.

  According to the present invention of the above-described means, even when a small-diameter grindstone is used, it is possible to generate an air flow that can discharge the machining powder (chip) and improve the dischargeability of the machining powder (chip).

It is a perspective view which shows schematic structure of the grinding machine of this embodiment. It is a side view which shows schematic structure of a grinding machine. It is a top view which shows schematic structure of a grinding machine. It is the side view which looked at the grindstone storage case of a grinding machine from the left side, and is a figure at the time of the small diameter grindstone being arrange | positioned. It is the perspective view which looked at the grindstone storage case of the grinding machine of FIG. 4 from the left front. It is the side view which looked at the state which removed the left side cover of the grindstone storage case from the left side, and is a figure in case a large diameter grindstone is arranged. It is the perspective view which looked at the state of the grindstone storage case of FIG. 6 from the left front. It is the side view which looked at the state which removed the left side cover of the grindstone storage case from the left side, and is a figure in case a small diameter grindstone is arranged. It is the perspective view which looked at the state of the grindstone storage case of FIG. 8 from the left front. It is the side view seen from the left side which shows the state which has arrange | positioned the outer peripheral surface cover of the large diameter grindstone to the right side cover. It is the perspective view which looked at the arrangement | positioning state shown in FIG. 10 from the left front. It is the side view which looked at the outer peripheral surface cover of the small diameter grindstone arrange | positioned at a right side surface cover from the left side. It is the perspective view which looked at the arrangement | positioning state shown in FIG. 12 from the left front. It is the top view seen from the upper side which shows the state which adjusted the coolant pipe to the upper surface cover so that adjustment was possible. It is a perspective view which shows the tray structure which collect | recovers the coolant after apply | coating to a grindstone. It is a perspective view which shows a shielding board. It is a figure which shows the structure which has arrange | positioned the shielding board to the grindstone cover apparatus for small diameters. It is a figure which shows the shielding board which can be adjusted and moved to an up-down direction.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present embodiment is a grinding machine for grinding an engine cam or the like.

  1 to 3 show the overall configuration of the grinding machine 2. The grinding machine 2 includes a bed 10, a table 20, a spindle stock 30, a tailstock 40, a grinding wheel platform 50, and the like. In the figure in which the X axis, the Y axis, and the Z axis are described, the X axis, the Y axis, and the Z axis are orthogonal to each other, the Y axis direction indicates a vertically upward direction, and the grindstone 55 is the workpiece in the Z axis direction. The horizontal direction cut into W is shown, and the X-axis direction is a horizontal direction parallel to the rotation axis 31J of the main shaft 31.

  As well shown in FIG. 3, the bed 10 is configured in a substantially T shape in plan view. As well shown in FIG. 1, X-axis guide surfaces 12 and 12V extending along the X-axis direction are provided, and an X-axis slit 12K extending along the X-axis direction is provided. 1 and 3, the bed 10 is provided with Z-axis guide surfaces 15 and 15V extending along the Z-axis direction, and with a Z-axis slit 15K extending along the Z-axis direction. It has been.

  The grindstone platform 50 is placed on the bed 10, supported by the static pressure guides on the Z-axis guide surfaces 15 and 15V, and can reciprocate along the Z-axis direction. The wheel head drive motor 50M rotates the ball screw 50B (see FIG. 2) based on a control signal from the control device 80. The control device 80 controls the grinding wheel base driving motor 50M while detecting the position of the grinding wheel base 50 in the Z-axis direction based on the detection signal from the encoder 50E (rotation detecting means), and thereby the position of the grinding wheel base 50 in the Z-axis direction. To control. As shown in FIG. 2, a nut 50N is screwed to the ball screw 50B, and the nut 50N is connected to the grinding wheel base 50 via an arm 50A inserted through the Z-axis slit 15K (see FIG. 1). ing. Therefore, when the grinding wheel base driving motor 50M rotationally drives the ball screw 50B, the position of the nut 50N in the Z-axis direction moves, and the grinding wheel base 50 connected to the nut 50N via the arm 50A moves along the Z-axis guide surface 15 with Z. Move in the axial direction.

  The grindstone base 50 is provided with a grindstone shaft 54 and a grindstone motor 55M that are rotatably supported around a grindstone rotation axis 55J parallel to the X-axis direction. As shown in FIG. 3, the grindstone rotation axis 55J and the spindle rotation axis 31J are both parallel to the X axis, and as shown in FIG. 2, the grindstone rotation axis 55J and the spindle rotation axis 31J are on the same virtual plane VM. It is in.

  A large-diameter pulley 51 is attached to the grindstone motor 55M. A grindstone 55 is attached to one end of the grindstone shaft 54, and a small-diameter pulley 52 is attached to the other end of the grindstone shaft 54. A belt 53 for power transmission is hung on the large diameter pulley 51 and the small diameter pulley 52. In the vicinity of the grindstone shaft 54, rotation detection means 55S capable of detecting the number of revolutions of the grindstone 55 is provided. The controller 80 controls the grindstone motor 55M by controlling the grindstone motor 55M while detecting the rotation speed of the grindstone 55 based on the detection signal from the rotation detecting means 55S.

  The grindstone 55 has a circular cross section cut by a plane orthogonal to the grindstone shaft 54, and CBN abrasive grains are hardened on the outer peripheral surface of the grindstone 55 by an adhesive or electrodeposition, and are integrated with the grindstone shaft 54. And rotate around the grinding wheel rotation axis 55J. Further, most of the grindstone 55 is covered with a grindstone storage case 91 except for the periphery of a grinding point K (see FIG. 2) where the workpiece W is ground. A coolant nozzle 58 that discharges coolant for cooling and lubrication toward the grinding point K of the grindstone 55 is provided on the upper portion of the grindstone storage case 91. Coolant is supplied to the coolant nozzle 58 from a coolant tank (not shown), and the outer periphery of the grinding point K (the virtual plane VM including the grinding wheel rotation axis 55J and the spindle rotation axis 31J, and the grinding wheel 55 on the side facing the workpiece W). The coolant used for cooling and lubrication at the intersection with the surface is collected in a flow path (not shown) and returned to the coolant tank. Impurities are removed in the coolant tank by an unillustrated device.

  The table 20 is placed on the bed 10, supported by the static pressure guide on the X-axis guide surface 12, and can reciprocate along the X-axis direction. The table drive motor 20M rotates a ball screw (not shown) based on a control signal from the control device 80. The control device 80 controls the position of the table 20 in the X-axis direction by controlling the table drive motor 20M while detecting the position of the table 20 in the X-axis direction based on the detection signal from the encoder 20E (rotation detection means). . A nut (not shown) is screwed to the ball screw, and the nut is connected to the table 20 via an arm (not shown) inserted through the slit 12K. Therefore, when the table drive motor 20M rotationally drives the ball screw, the position of the nut in the X-axis direction moves, and the table 20 connected to the nut via the arm moves along the X-axis guide surface 12 in the X-axis direction. A headstock 30 is fixed to one end of the table 20 in the X-axis direction, and a tailstock 40 is fixed to the other end.

  The headstock 30 includes a main shaft 31 that rotates around a main shaft rotation axis 31J parallel to the X-axis direction, a center 32 that uses the main shaft rotation axis 31J as a central axis, a main shaft motor 31M that rotates the main shaft 31, an encoder 31E, and the like. have. A drive fitting 33 that connects the spindle 31 and the workpiece W is attached to the spindle 31. The drive fitting 33 has a gripping part 33A for gripping the workpiece W and a connection part 33B for connecting the gripping part 33A and the main shaft 31, and rotates around the main shaft rotation axis 31J integrally with the main shaft 31. To rotate the workpiece W. The control device 80 controls the spindle motor 31M while detecting the rotation angle and rotation speed of the spindle 31 based on the detection signal from the encoder 31E (rotation detection means), and thereby the rotation angle and rotation speed of the spindle 31 (that is, the workpiece) W rotation angle and rotation number) are controlled.

  The tailstock 40 includes a center 42 having the spindle rotation axis 31J as a central axis, and a ram 41 that accommodates the center 42 and is biased in a direction toward the spindle 30. The center axis of the center 42 of the tailstock 40 and the center axis of the center 32 of the headstock 30 both coincide with the main shaft rotation axis 31J. The workpiece W sandwiched between the center 32 and the center 42 is pressed toward the headstock 30 by the center 42, and rotates around the main shaft rotation axis 31J by the rotation of the main shaft 31 and the drive fitting 33.

  A feature of the grinding machine 2 of the present embodiment described above is that two types of diameters of the grindstone 55 attached to the grindstone shaft 54 are set according to the type of the workpiece W. For example, when the concave portion is formed in the cam shape of the workpiece W, a small-diameter grindstone 57 having a relatively small diameter as shown in FIGS. 8 and 9 is set. When the recess is not formed, a large-diameter grindstone 56 having a relatively large diameter as shown in FIGS. 6 and 7 is set. That is, the size of both diameters is such that the small-diameter grindstone 57 <the large-diameter grindstone 56.

  And in this embodiment, the large diameter grindstone 56 and the small diameter grindstone 57 take the structure of the grindstone cover apparatus 60 corresponding to the magnitude | size of each diameter, It is characterized by the above-mentioned. 6 and 7 show a large-diameter grindstone cover device 60L provided for the large-diameter grindstone 56. FIG. 8 and 9 show the configuration of a small-diameter grindstone cover device 60S provided for the small-diameter grindstone 57. FIG. Hereinafter, the configuration in each case will be described.

  First, a basic configuration common to the large-diameter grindstone cover device 60L and the small-diameter grindstone cover device 60S will be described. The large-diameter grindstone cover device 60L and the small-diameter grindstone cover device 60S are formed inside a grindstone storage case 91 formed in a box shape shown in FIGS. The internal structure of the grindstone storage case 91 is well shown in FIGS. 6 to 9, particularly in FIGS. 10 and 11. 6 to 9 show a state in which the left side cover 92 of the grindstone storage case 91 shown in FIGS. 4 and 5 is removed, and a case where a large diameter grindstone cover device 60L (FIGS. 6 and 7) is mounted therein. The small diameter grindstone cover device 60S (FIGS. 8 and 9) is shown. 10 and 11 show only the grindstone storage case 91 in an enlarged manner.

  As can be seen from FIGS. 6 to 9, 10, and 11, the grindstone storage case 91 includes a right side cover 93, a left side cover 92 (see FIGS. 4 and 5), both And an outer peripheral surface cover 94 disposed between the covers 93 and 92. And the space S where the grindstone 55 can be arrange | positioned inside is formed. The outer peripheral surface cover 94 is configured by connecting an upper surface plate 94A, an inclined plate 94B, a back surface plate 94C, and a bottom surface plate 94D in this order.

  The outer peripheral surface cover 94 has a space on the side where the workpiece W is disposed. 6 to 9, an opening F is provided between the upper surface plate 94 </ b> A and the bottom surface plate 94 </ b> D and between the left side cover 92 and the right side cover 93. 4 and 5, a part of the grindstone 55 disposed in the internal space S of the grindstone storage case 91 is exposed and disposed from the opening F. The workpiece W is machined at the machining point K by the grindstone 55.

  As shown well in FIGS. 4 and 5, the left side cover 92 is connected to the back plate 94 </ b> C of the outer peripheral surface cover 94 with a hinge 82 at the left side of the figure so as to be openable and closable and removable. . Therefore, the left side cover 92 can be opened and closed, and the illustrated state shown in FIGS. 6 to 9 is the same as the state in which the left side cover 92 is opened. In this state, the work for replacing the grindstone 55 is performed. Or, an installation operation of a small-diameter grindstone cover device 60S, which will be described later, is performed. The left side cover 92 is fixed in a closed state by a fixing bolt 84 shown in FIGS.

  The right side cover 93 is disposed in close contact with the grinding wheel base 50.

  A coolant supply pipe 59 for supplying coolant is provided on the upper surface of the upper surface plate 94A of the grindstone storage case 91. A coolant nozzle 58 is connected to the tip of the coolant supply pipe 59, and the coolant is sprayed from the coolant nozzle 58 toward the grinding portion (grinding point K) of the workpiece W by the grindstone 55. In the present embodiment, the spray position of the coolant nozzle 58 can be adjusted in the front-rear direction. FIG. 14 shows the piping configuration. As shown in FIG. 14, the coolant supply pipe 59 is fixed to a mounting plate 59A, and a long hole 59B is formed in the mounting plate 59A. The long hole 59B is fixed to the upper surface plate 94A by an adjusting bolt 59C, and the position of the coolant nozzle 58 can be changed by changing the long hole 59B fixed by the adjusting bolt 59C.

  Next, the configuration of a large-diameter grindstone cover device 60L in which the large-diameter grindstone 56 shown in FIGS. 6 and 7 is used will be described. The large-diameter grindstone cover device 60L includes a large-diameter outer peripheral surface cover 62, a right-side cover 93, and a left-side cover 92 (not shown in FIGS. 6 and 7, see FIGS. 4 and 5). The The large-diameter outer peripheral surface cover 62 is disposed inside the space S formed by the grindstone storage case 91 described above, and is disposed in an integrated state fixed to the right side surface cover 93. As the right side cover 93 and the left side cover 92, the right side cover 93 and the left side cover 92 that form the grindstone storage case 91 described above are used as they are. And the component of these large diameter grindstone cover apparatuses 60L is the large diameter wall which surrounds the large diameter grindstone said by this invention.

  The outer peripheral surface cover 62 for large diameter is disposed at a constant gap interval along the shape of the outer peripheral surface 56G so as to cover the outer peripheral surface 56G of the large diameter grindstone 56 shown in FIGS. . The right side cover 93 is disposed so as to cover the right side surface of the large-diameter grindstone 56. The left side surface cover 92 is also disposed so as to cover the left side surface of the large-diameter grindstone 56.

  In the space S of the grindstone storage case 91, a first internal space S1 defined by the above-described large-diameter grindstone cover device 60L is formed. That is, in the large-diameter grindstone cover device 60L, the first inner space S1 that accommodates the large-diameter grindstone 56 is formed by the large-diameter outer peripheral surface cover 62, the right-side cover 93, and the left-side cover 92. As shown in FIG. 6, the first internal space S <b> 1 is disposed so as to cover the large-diameter grindstone except around the grinding point (processing point) K between the large-diameter grindstone 56 and the workpiece W. In FIG. 6, the rotation direction of the large-diameter grindstone 56 is a clockwise direction, and the rotation direction of the workpiece W is a clockwise direction.

  In addition, the arrangement | positioning clearance gap between the outer peripheral surface cover 62 for large diameters and the outer diameter outer peripheral surface 56G of the large diameter grindstone 56 is a clearance which the airflow of a clearance | gap can be entrained by the large diameter grindstone 56 by rotation of the large diameter grindstone 56. It is said that. That is, the gap of the air flow that can be swung varies depending on the size of the diameter and the peripheral speed of the outer diameter outer peripheral surface 56G of the large-diameter grindstone 56, and is set in consideration of these. In the present embodiment, the large-diameter outer peripheral surface cover 62 is disposed from the outer peripheral surface 56G of the large-diameter grindstone 56 with a certain gap along the outer periphery.

  The large-diameter grindstone cover device 60L is provided with a large-diameter opening FL having no large-diameter wall between the upper and lower ends of the outer-diameter outer surface cover 62 and between the right-side cover 93 and the left-side cover 92. It has been. The tip is close to the large-diameter grindstone 56, and a coolant nozzle 58 for coolant is disposed around the processing point K of the workpiece W. Coolant is blown out from the coolant nozzle 58 toward the processing point K to perform cooling. The large-diameter opening FL of the large-diameter grindstone cover device 60L of the present embodiment is formed from the upper end portion of the large-diameter outer peripheral surface cover 62 to the lower portion as seen in FIGS. .

  Further, as shown in FIGS. 6 and 7, the discharge port 68 is provided at the lower position of the large-diameter grindstone cover device 60 </ b> L. From the discharge port 68, the coolant sprayed on the processing point K and the processing powder of the workpiece W are discharged downward.

  In the large-diameter grindstone cover device 60L described above, the space between the outer-diameter outer peripheral surface 56G of the large-diameter grindstone 56 and the large-diameter outer peripheral surface cover 62 that covers the large-diameter grindstone 56 is relatively narrow. As a result, the airflow in the space is swung by the rotation of the large-diameter grindstone 56, and even if chips enter the space, the airflow is swung by the rotation of the large-diameter grindstone 56 and is discharged from the discharge port 68 together with the coolant. And discharged from the large-diameter opening FL to the outside.

  Next, the configuration of the small-diameter grindstone cover device 60S in which the small-diameter grindstone 57 shown in FIGS. 8 and 9 is used will be described. The small-diameter grindstone cover device 60S includes a small-diameter outer peripheral surface cover 66, a right-side surface cover 93, and a left-side surface cover 92 (not shown in FIGS. 8 and 9; see FIGS. 4 and 5). A component of the small-diameter grindstone cover device 60S is a small-diameter wall surrounding the small-diameter grindstone 57 referred to in the present invention. The small-diameter grindstone cover device 60S is mounted and formed in the first internal space S1 formed by the large-diameter grindstone cover device 60L shown in FIGS. In this case, the large-diameter grindstone 56 is equipped with being removed from the grindstone shaft 54. The large-diameter outer peripheral surface cover 62 is not removed and is still installed.

  The small-diameter outer peripheral surface cover 66 is disposed in an arc shape along the outer diameter outer peripheral surface 57G so as to cover the outer peripheral surface 57G of the small-diameter grindstone 57 shown in FIGS. For the right side cover 93 and the left side cover 92, the right side cover 93 and the left side cover 92 forming the grindstone storage case 91 are used as they are, as in the configuration of the large diameter cover device 60S. That is, the right side surface cover 93 is disposed so as to cover the right side surface of the small diameter grindstone 57, and the left side surface cover 92 is disposed so as to cover the left side surface of the small diameter grindstone 57.

  12 and 13 show the detailed configuration of the combination of the outer peripheral surface cover 66 for small diameter and the mounting plate 76 thereof. As shown in the drawing, the small-diameter outer peripheral surface cover 66 and its mounting plate 76 are integrated by appropriate means such as welding. For this reason, the small diameter outer peripheral surface cover 66 is attached to and removed from the right side cover 93 by the attachment plate 76 being detachably attached to the right side cover 93. The mounting plate 76 is disposed as a plate-like member facing the right side cover 93 at the right end portion of the outer peripheral surface cover 66 for small diameter, and is attached to the right side cover 93 with a fastener such as a bolt 78.

  In the small-diameter grindstone cover device 60 </ b> S, the above-described small-diameter outer peripheral surface cover 66, right side cover 93, and left side cover 92 form a second internal space S <b> 2 that accommodates the small-diameter grindstone 57. As shown in FIGS. 8 and 9, the second internal space S <b> 2 is disposed so as to cover the small-diameter grindstone 57 except around the grinding point (processing point) K between the small-diameter grindstone 57 and the workpiece W. In the case of the arrangement form of the small-diameter grindstone 57, as in the case of the arrangement form of the large-diameter grindstone 56, the rotation direction of the small-diameter grindstone 57 is the clockwise direction as seen in FIGS. The rotation direction of the workpiece W is the clockwise direction.

  The disposition gap between the small-diameter outer peripheral surface cover 66 and the outer-diameter outer peripheral surface 57G of the small-diameter grindstone 57 is the same as the disposition gap provided in the large-diameter grindstone 56. In other words, the clearance is such that the airflow in the gap can be engulfed by the small diameter grindstone 57 by the rotation of the small diameter grindstone 57. The gap of the air flow that can be changed varies depending on the diameter and the peripheral speed of the outer peripheral surface 57G of the small-diameter grindstone 57 as described above. Therefore, the airflow gap formed by the small-diameter outer peripheral surface cover 66 and the airflow gap formed by the large-diameter outer peripheral surface cover 62 are set in consideration of these. The size of the gap is not necessarily the same.

  The small-diameter grindstone cover device 60S is provided with a small-diameter opening FS having no small-diameter wall between the upper and lower ends of the small-diameter outer peripheral surface cover 62 and between the right-side cover 93 and the left-side cover 92. The tip is close to the small-diameter grindstone 57, and a coolant nozzle 58 for coolant is disposed around the processing point K of the workpiece W. The position of the coolant nozzle 58 is different from the position of the coolant nozzle 58 provided on the large-diameter grindstone 56. The arrangement position is adjusted by adjusting the position of the coolant supply pipe 59 shown in FIG. 14 with the adjusting bolt 59C. The function of the coolant is as described for the large-diameter grindstone 56. The small-diameter opening FS of the small-diameter grindstone cover device 60S of the present embodiment is formed so as to open from the upper end portion of the small-diameter outer peripheral surface cover 66 to the lower portion as seen in FIGS.

  Also in the case of the small-diameter grindstone cover device 60S, a discharge port 69 is provided at the lower position as seen in FIGS. The coolant sprayed on the processing point K and the processing powder of the workpiece W are discharged from the discharge port 69.

  In the small-diameter grindstone cover device 60 </ b> S, a shielding plate 70 constituting the discharge port 69 is provided at a front position of the discharge port 69 (a right position as viewed in FIGS. 8 and 9). That is, the small-diameter grindstone 56 is provided in the rotational direction front position in the small-diameter opening FS. The shielding plate 70 allows the processing powder generated by the processing of the small-diameter grindstone 57 to enter between the small-diameter outer peripheral surface cover 66 and the outer-diameter outer peripheral surface 57G of the small-diameter grindstone 57 due to the air flow of the small-diameter grindstone 57. Suppress as much as possible. 8 and 9, the gap between the upper end of the shielding plate 70 and the outer diameter outer peripheral surface 57G of the small diameter grindstone 57 is the outer diameter outer surface 57G of the small diameter outer peripheral surface cover 66 and the small diameter grindstone 57. It is set to be smaller than the gap between. The shielding plate 70 of this embodiment corresponds to the shielding part of the present invention.

  FIG. 16 is a perspective view of a single shielding plate 70. As shown in FIG. 16, the shielding plate 70 and the attachment portion 85 are integrally formed by being connected in a crank shape via a connection portion 87. A long hole 86 for attachment is formed in the attachment portion 85, and the shielding plate 70 is attached to the small-diameter grindstone cover device 60S through the long hole 86.

  FIG. 17 shows a perspective view of the arrangement of the shielding plates 70 arranged in FIGS. The shielding plate 70 is disposed in the right position as viewed in FIG. 17 and forms a discharge port 69 between the lower hanging plate 66A and the discharge port forming plate 73 in the left position. At the right side of the discharge port forming plate 73, a lower hanging plate 66A of the outer peripheral surface cover 66 for small diameter is disposed. As a result, the foreign matter that has entered the small-diameter grindstone cover device 60 </ b> S is discharged from the discharge port 69.

  FIG. 18 shows a configuration example as another embodiment in which the above-described shielding plate 70 can be adjusted in the vertical direction. The shield plate 70 shown in FIG. 18 moves up and down in the vertical direction so that the gap X between the upper end of the shield plate 70 and the outer diameter outer peripheral surface 57G of the small-diameter grindstone 57 can be adjusted. Therefore, an actuator 72 that moves the shielding plate 70 up and down is disposed at the lower end of the shielding plate 70. Further, a non-contact distance sensor 74 for monitoring and detecting the gap X at the upper end portion of the shielding plate 70 is disposed at the upper end portion of the shielding plate 70. Thereby, when the distance (gap) between the shielding plate 70 and the small-diameter grindstone 57 is changed, the shielding plate 70 can be moved and kept at a constant distance. In addition, in FIG. 18, the code | symbol 57A has shown the core of the small diameter grindstone 57, and the code | symbol 57B has shown the grindstone (CBN abrasive grain).

  The non-contact distance sensor 74 that directly detects the gap X between the upper end of the shielding plate 70 and the outer diameter outer peripheral surface 57G of the small-diameter grindstone 57 is any detection means as long as it is non-contact. Also good. Further, a means for estimating the distance may be used by measuring a state change amount (for example, pressure, flow velocity, etc.) due to the gap. The actuator 72, which is a means for moving the shielding plate 70, may be an electric motor that operates a ball screw mechanism, and any means may be used as long as it is a linear motion cylinder or the like.

  In the present embodiment, the shielding plate 70 is not set in the case of the large-diameter grindstone 56. When the small-diameter grindstone 57 is used, the shielding plate 70 is attached while adjusting the position of the long hole 86 (see FIG. 16). Therefore, the shielding plate 70 can be removed from the small-diameter grindstone cover device 60S, and is removed in the case of the large-diameter grindstone cover device 60L.

  FIG. 15 shows a tray configuration 90 of the coolant recovery device. The tray configuration 90 is disposed at a lower position of the grindstone storage case 91 as shown in FIGS. 4 to 9, and collects the coolant sprayed on the grindstone 55 from the coolant nozzle 58. Along with the recovery of the coolant, the processing powder of the grindstone 55 is also recovered. In addition, the tank part 88 is provided in the right side position of the tray structure 90 shown in FIG. 15, and it sends to a clean tank through the tank from the tank part 88. FIG. In order to reuse the coolant recovered in the clean tank, cleanup is performed to remove chips.

  In the small-diameter grindstone cover device 60S described above, the space between the outer-diameter outer peripheral surface 57G of the small-diameter grindstone 57 and the small-diameter outer peripheral surface cover 66 covering it is relatively the same as in the large-diameter grindstone cover device 60L. narrow. As a result, the airflow in the space is swung by the rotation of the small-diameter grindstone 57, and even if chips enter the space, the airflow is swung by the rotation of the small-diameter grindstone 57 and is discharged from the discharge port 69 together with the coolant. It is discharged from the opening FS for the outside. Then, the coolant is sent to the clean tank for processing, and the chips are separated by a magnetic separation device (not shown).

  In addition, when the small diameter grindstone 57 is used and the shield plate 70 is provided and the shield plate 70 is moved up and down in the vertical direction, the following effects are also obtained. First, by controlling the amount of chips (processed powder) entering, the volume of the chips can be reduced, and maintenance for removing the chips can be reduced. Next, heat generated by the contact between the chips and the small-diameter grindstone 57 due to the accumulation of chips is eliminated, and a reduction in processing accuracy can be prevented.

  As described above, according to this embodiment, even in the grinding machine 2 that uses two types of grinding wheels, the large-diameter grindstone 56 and the small-diameter grindstone 57, it is possible to generate an airflow that can discharge the machining powder, It can be discharged. That is, unlike the conventional case, there is no problem that the processing powder is not discharged and is accumulated in the space.

  While the present invention has been described with respect to specific embodiments, the present invention can be implemented in various other forms.

  For example, in the above-described embodiment, the present invention is applied to the grinding machine 2, but can be applied to other machine tools.

  Further, in the above-described embodiment, the shielding plate 70 is set in the small-diameter grindstone cover device 60S, and together with the small-diameter grindstone cover device 60S, a synergistic effect is obtained that reduces chips accumulated in the second internal space S2. However, the setting of the shielding plate 70 is not necessarily required and may not be provided.

2 Grinder 10 Bed 20 Table 20E Encoder (Rotation detection means)
20M table drive motor 30 headstock 31 spindle 32 center 31E encoder (rotation detection means)
31J Spindle axis 31M Spindle motor 33 Drive bracket 40 Tailstock 41 Ram 42 Center 50 Grinding wheel base 50E Encoder (Rotation detection means)
50M grinding wheel drive motor 54 grinding wheel shaft 55 grinding wheel 55J grinding wheel rotation axis 55M grinding wheel motor 55S rotation detecting means 56 large diameter grinding wheel 56G outer diameter outer circumferential surface 57 small diameter grinding wheel 57G outer diameter outer circumferential surface 58 coolant nozzle 59 coolant supply pipe 59A mounting plate 59B length Hole 59C Adjustment bolt 60 Grinding wheel cover device 60L Large diameter grinding wheel cover device 60S Small diameter grinding wheel cover device 62 Large diameter outer peripheral surface cover 66 Small diameter outer peripheral surface cover 66A Lower hanging plate 69 Discharge port 70 Shielding plate 72 Actuator 74 Non-contact distance Sensor 76 Mounting plate 78 Bolt 80 Control device 82 Hinge 84 Fixing bolt 85 Mounting portion 86 Elongated hole 87 Connection portion 88 Tank portion 90 Tray configuration 91 Grindstone storage case 92 Left side cover 93 Right side cover 94 Outer surface cover 94A Upper surface plate 94B Slope 94C backside plate 94D bottom plate W workpiece K machining point (grinding point)
S internal space S1 first internal space S2 second internal space F opening FL large-diameter opening FS small-diameter opening

Claims (3)

A grindstone cover device that is attached to a grindstone base body that rotatably supports the grindstone shaft, and that covers the grindstone attached to the grindstone shaft, leaving the periphery of the grinding point as an opening, and covering other than the opening,
The grindstone is a rotating body having a circular cross section, and there are two types with different diameters, either a large diameter grindstone with a large diameter or a small diameter grindstone with a small diameter,
A large-diameter grindstone cover device that forms a first internal space for accommodating the large-diameter grindstone;
A small-diameter grindstone cover device that is detachably disposed in a first internal space formed by the large-diameter grindstone cover device and forms a second internal space that houses the small-diameter grindstone.
Wheel cover device. The large-diameter grindstone cover device includes a large-diameter opening as the opening, and includes a large-diameter wall that surrounds the large-diameter grindstone other than the large-diameter opening,
The small-diameter grindstone cover device includes a small-diameter opening as the opening, and includes a small-diameter wall surrounding the small-diameter grindstone other than the small-diameter opening.
The grindstone cover apparatus according to claim 1. In the rotational position forward position of the small-diameter grindstone in the small-diameter opening, a shield that narrows the entry gap between the small-diameter grindstone and the small-diameter wall is provided detachably.
The grindstone cover apparatus according to claim 2.

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