JP6335994B2 - Grinding equipment - Google Patents

Description

  According to the present invention, a part of a plurality of work accommodation holes formed in an outer edge portion of a rotary table is sandwiched in a vertical direction by a pair of rotary grindstones, and a support table is arranged below the remaining work accommodation holes to accommodate the work. The present invention relates to a grinding apparatus for grinding both ends of a work housed in a hole with a pair of rotating grindstones.

  Conventionally, as this kind of grinding device, when the workpiece is ground to the target length and the grinding is completed, the workpiece receiving port provided in the support table is opened, and the workpiece is sequentially transferred from the plurality of workpiece receiving holes to the workpiece receiving port. What is taken in is known (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2012-035355 (see paragraph [0026], FIG. 3)

However, since the conventional grinding device described above continues grinding the workpiece until all the workpieces are taken into the workpiece receiving port even after the grinding is completed, the workpiece may be shorter than the target length. There is a problem that the length of the workpiece varies.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a grinding apparatus with higher grinding accuracy than in the past.

The invention of claim 1 made to achieve the above object is a pair of rotations that are rotationally driven in a state of being opposed to each other in a vertical direction across a grinding space with a rotary table having a plurality of work receiving holes at the outer edge. A grindstone, and a support table having a substantially flush upper surface with the upper surface of the lower rotating grindstone, wherein a part of the plurality of workpiece accommodation holes is disposed in the grinding space and the remaining workpiece accommodation holes In the grinding apparatus in which the rotary table is driven to rotate in a state in which the rotary table is disposed on the support table, and both ends of the workpieces accommodated in the workpiece accommodation holes are ground by the pair of rotary grindstones. The table is rotatably supported, and a grinding position in which a part of the plurality of work receiving holes is disposed in the grinding space, and a retracting position in which all of the plurality of work receiving holes are disposed outside the grinding space. A table supporting mechanism which movably supports to the location, the work of the rotary table of the grinding position and test length unit for Kencho, the reference length Kencho results for the work of the rotary table of the grinding position One of the conditions is that the table support mechanism is operated to move the rotary table at the grinding position to the retracted position, and the rotary table is positioned between the pair of rotary grindstones. And a control unit that puts it into a state where it is not.

The invention according to claim 2 is a setup completion state in which the table support mechanism supports a plurality of the rotary tables, and the rotary table in the retracted position accommodates the unground new workpiece in the workpiece accommodation hole. A determination unit for determining whether or not the length of the rotary table at the grinding position reaches a reference length, and the rotary table at the retracted position is in the setup completion state. The rotary table at the grinding position is moved to the retracted position, the other rotary table in the set-up completion state is moved to the grinding position, and the workpiece of the rotary table at the grinding position is moved. When the length measurement result for the sensor reaches a reference length and the rotary table at the retracted position is not in the set-up completion state, the rotary table at the grinding position is moved to the retracted position. The rotary table of Te is grinding apparatus according to claim 1, disposed in the retracted position.

Grinding apparatus of the present invention is to move that Kencho results for the rotary table of the workpiece grinding position reaches the reference length Te 1 Tsunishi condition to the retracted position of the rotary table, a plurality of workpieces of the turntable Since all of the accommodation holes are disposed outside the grinding space, the workpiece is not continuously ground for a while after the grinding is completed as in the prior art, and the grinding accuracy can be increased as compared with the conventional art.

Further, there may be one rotary table or a plurality of rotary tables. If you are having a plurality of rotary tables, as well as determination of whether the rotary table of the grinding position the workpiece has reached the reference length, to determine be another of the rotary table is in the setup-completed state, grinding position When the length measurement result for the workpiece of the rotary table reaches the reference length and the rotary table at the retracted position is in the setup complete state, the rotary table at the grinding position is moved to the retracted position and another setup complete state is When the rotary table is moved to the grinding position, the length measurement result for the work of the rotary table at the grinding position reaches the reference length, and the rotary table at the retracted position is not in the setup completion state, the rotary table at the grinding position is moved to the retracted position. It is good also as a structure which arrange | positions and arrange | positions all the rotary tables in a retracted position (invention of Claim 2 ). By adopting such a configuration, for example, a rotary table that does not contain a workpiece moves to the grinding position, a rotary table that contains a ground workpiece, moves to the grinding position, and Thus, it is possible to eliminate the problem that the rotary table in the middle of the set-up moves to the grinding position.

The side view of the grinding device concerning one embodiment of the present invention. Front sectional drawing of the table unit in the AA cut surface of FIG. Sectional drawing of the sub-frame in the CC cut surface of FIG. Sectional drawing of the grinding apparatus in the BB cut surface of FIG. Enlarged side sectional view around the rotary table Partially enlarged side sectional view of rotating wheel and rotating table Block diagram of grinding equipment Flow chart of grinding process

  Hereinafter, a grinding apparatus 10 according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the grinding apparatus 10 according to this embodiment includes a table unit 20 on the front surface of a grinding apparatus body 11. The main body 11 of the grinding apparatus includes a main frame 12 having a vertically long casing structure, and a pair of rotating grindstones 13 and 14 are vertically arranged in the main frame 12 so as to face each other. The pair of rotary grindstones 13 and 14 are both in an annular shape, and their rotation axes are arranged substantially coaxially. The rotating grindstones 13 and 14 are, for example, driven to rotate in the same direction at the same rotational speed, and can be moved to arbitrary positions in the vertical direction. In addition, a front opening 15 is formed in the central portion of the front surface of the main frame 12 in the vertical direction, and a rotary table 41 and a fixed support table 25 described later are received in the main frame 12 from the front opening 15. .

  As described above, the table unit 20 is provided on the front surface of the grinding apparatus main body 11 and includes the “table support mechanism” according to the present invention. The table unit 20 rotatably supports the rotary table 41, and the pair of rotary tables 41 It moves to the grinding position arranged in the grinding space between the rotating grindstones 13 and 14 and the retracted position arranged outside the grinding space. Hereinafter, the table unit 20 will be described in detail on the assumption that the grinding device body 11 side is “rear side” and the opposite side is “front side”.

  The table unit 20 has a substantially rectangular parallelepiped subframe 21, and the horizontal width of the subframe 21 is substantially the same as the horizontal width of the main frame 12. As shown in FIGS. 2 and 3, a pair of hinge arms 21 </ b> H and 21 </ b> H are provided on one side of the rear surface of the subframe 21. As shown in FIG. 1, the sub-frame 21 is overlapped at a lower position on the front surface of the main frame 12, and the hinge arms 21 </ b> H and 21 </ b> H are hinged to the front surface of the main frame 12. The other side portions of the subframe 21 and the main frame 12 are fixed to a lock mechanism (not shown). Further, the entire table unit 20 is floating from the floor surface. Then, if necessary, the lock mechanism can be unlocked and the table unit 20 can be rotated with respect to the grinding apparatus body 11.

  As shown in FIG. 3, the planar shape of the subframe 21 is substantially square and is open in both the upper and lower directions. Further, a plurality of support plates 23 shown in FIGS. 2 and 3 protrude in four directions from the outer surface of the upper end portion of the subframe 21. The upper surfaces of the support plates 23 are flush with each other, and the fixed support table 25 according to the present invention shown in FIG. The fixed support table 25 has an octagonal shape as a whole, for example. In addition, as shown in FIG. 4, in the fixed support table 25, on the grinding apparatus body 11 side, in order to avoid interference with the lower rotating grindstone 14, an arc-shaped notch that swells inward from the outer peripheral surface side. 25B is formed. The inner surface of the notch 25B faces the outer peripheral surface of the lower rotating grindstone 14 with a slight gap. Some of the support plates 23 are supported from below by ribs 23L (see FIG. 3).

  As shown in FIG. 2, a support beam 22 is bridged between inner surfaces facing in the lateral direction of the subframe 21 at a position near the lower end inside the subframe 21 (in FIG. 2, The state where the rotary tables 41 and 41, which will be described later, are retracted from the main frame 12 is shown). As shown in FIG. 3, the support beam 22 is located at the center in the front-rear direction of the subframe 21, and the horizontal center position of the support beam 22 (that is, a square centroid that is a planar shape of the subframe 21 and Center hole 50A penetrates vertically. As shown in FIG. 2, the support table shaft 29 is rotatably supported by the center hole 50A via a bearing. Further, the support table shaft 29 extends upward to a position near the upper surface of the subframe 21, and a rotation bar 27 is attached to an upper end portion thereof so as to be integrally rotatable. As shown in FIG. 4, the rotating bar 27 has a prismatic shape and rotates within the subframe 21 while drawing a circle slightly smaller than the circular opening 25 </ b> A of the fixed support table 25.

  A disk-shaped table main body 26H is fixed to the upper surface of the rotary bar 27 via circular spacers 26S and 26S (see FIGS. 4 and 5), and the rotary bar 27 and the table main body 26H are used in accordance with the present invention. A movable support table 26 is configured. The table body 26H is loosely fitted in the circular opening 25A of the fixed support table 25 with a slight gap. Furthermore, the upper surface of the table body 26H and the upper surface of the fixed support table 25 are disposed substantially flush with each other. The movable support table 26 and the fixed support table 25 constitute a support table 10T according to the present invention.

As shown in FIG. 2, the lower end portion of the support table shaft 29 has a cylindrical shape, and the output shaft 50J of the support table drive source 50 corresponding to the “position control motor” of the present invention serves as a key (not shown). Are connected so as to be integrally rotatable. Support table drive source 50, as shown in FIG. 2, it is attached to reduction gear 50G on one end coaxial servo motor 50M, the body portion of the reduction gear 50G is fixed to the lower surface of the support beam 22, reduction gearbox The 50G output shaft 50J is connected to the support table shaft 29 as described above. Then, the output of the servo motor 50M is decelerated and transmitted to the output shaft 50J of the speed reducer 50G and applied to the support table shaft 29, whereby the movable support table 26 is rotationally driven.

  First support holes 30 </ b> A and 30 </ b> A penetrating the rotation bar 27 vertically are formed at both ends of the rotation bar 27 that are symmetrical with respect to the support table shaft 29. The movable support table 26 is formed with support holes 26A and 26A communicating with the first support hole 30A of the rotary bar 27.

  The rotary table shafts 31 and 32 are rotatably supported by the first support holes 30A and 30A of the rotary bar 27 through bearings, respectively. Then, the rotary table shafts 31 and 32 pass through the support holes 26A and 26A of the movable support table 26 and protrude upward from the movable support table 26. Further, the rotary table shafts 31 and 32 also protrude below the rotary bar 27, and the rotary table shafts 31 and 32 have the same structure except that their downward protruding amounts are different.

  Intermediate flanges 31F and 32F protrude laterally from the intermediate positions in the vertical direction of the rotary table shafts 31 and 32, respectively, and the intermediate flanges 31F and 32F support the rotary table shafts 31 and 32, respectively. It is in contact with the inner of the bearing.

  A rotary table 41 is mounted on each rotary table shaft 31, 32 from above. As shown in FIG. 5, the rotary table 41 is formed by inserting a support sleeve 44 through a through hole formed in the center of a disk-shaped table main body 43. The support sleeve 44 has a structure in which a lower end flange 44F protrudes laterally from the lower end of the cylindrical body, and the table main body 43 is fixed to the lower end flange 44F with a bolt B1. The support sleeve 44 is fitted and key-connected to the upper part of the rotary table shafts 31 and 32 above the intermediate flanges 31F and 32F, and the upper end portion of the support sleeve 44 is covered by the lid body 44W. The support sleeve 44 is fixed by a bolt B3. Further, the lid 44W is provided with an adjustment bolt B2 that is connected to the rotary table shafts 31 and 32 so as not to be able to move linearly and to be rotatable, and a fixing bolt B4 is provided on the side of the support sleeve 44. It has been. Thereby, the clearance gap between the table main body 43 and the movable support table 26 can be adjusted, and the table main body 43 can be supported in the state slightly floated from the fixed support table 25 and the movable support table 26. The upper surface of the lower end flange 44F is disposed in a state slightly above the upper surfaces of the fixed support table 25 and the movable support table 26.

  As shown in FIG. 4, a plurality of work receiving holes 45 are formed in the outer edge portion of the rotary table 41 (specifically, the outer edge portion of the table main body 43). Then, as shown in FIG. 6, a compression coil spring is accommodated as a work W in each work accommodation hole 45. Further, as shown in FIG. 4, the rotary table 41 is accommodated in the fixed support table 25 and has a size such that the rotary tables 41 and 41 do not interfere with each other. Then, due to the rotation of the movable support table 26, a part of one of the rotary tables 41 is arranged between the pair of rotary grindstones 13 and 14, and the workpieces W in the workpiece receiving holes 45 of the rotary table 41 are arranged. The upper and lower ends are ground by the rotating grindstones 13 and 14.

  Hereinafter, in FIG. 4, the rotary grindstones 13 and 14 are located on the side of the rotary grindstones 13 and 14, and the straight lines connecting the rotation centers of the rotary grindstones 13 and 14 and the rotation center 41 are shortest. The rotary table 41 in a state where a part of the workpiece is disposed in the grinding space is referred to as a “rotary table 41 in the grinding position”, and the rotary table 41 in a state in which all of the plurality of workpiece receiving holes 45 are disposed outside the grinding space. This is referred to as a turntable 41 at the retracted position. In addition, the rotary table 41 located on the opposite side of the grinding position among the retracted positions is referred to as “the rotary table 41 at the grinding facing position”. Further, when distinguishing between the rotary table shafts 31 and 32, as shown in FIG. 2, the rotary table shaft 31 having a small downward projection from the rotary bar 27 is referred to as a “first rotary table shaft 31”. The rotary table shaft 32 having a large value is referred to as a “second rotary table shaft 32”. Furthermore, only when distinguishing between the rotary tables 41, 41, the rotary table 41 mounted on the rotary table shaft 31 is referred to as a “first rotary table 41”, and the rotary table mounted on the rotary table shaft 32. 41 is referred to as a “second rotary table 41”.

  As shown in FIG. 2, in order to rotationally drive the first rotary table 41, the “first rotary table drive motor” of the present invention is disposed on the left side of the support table drive source 50 among the support beams 22. A first rotary table drive source 51 corresponding to is attached. Further, in order to rotationally drive the second rotary table 41, a position of the support beam 22 that is symmetrical to the first rotary table drive source 51 with the support table drive source 50 interposed therebetween is “ A second rotary table drive source 52 corresponding to the “second rotary table drive motor” is attached. Similarly to the support table drive source 50, the first and second rotary table drive sources 51 and 52 have speed reducers 51G and 52G mounted on one end of the servo motors 51M and 52M. The main body portion of 52G is fixed to the lower surface of the support beam 22.

  The support beam 22 is provided with support holes 51A and 52A that vertically penetrate the upper positions of the first and second rotary table drive sources 51 and 52. The first and second support holes 51A and 52A are provided with first and second support holes 51A and 52A, respectively. First stage shafts 53 and 54 are rotatably supported via bearings. Similarly to the connection between the support table shaft 29 and the support table drive source 50, the output shaft 51J of the first rotary table drive source 51 is connected to the first first stage shaft 53 so as to be integrally rotatable, and the second The output shaft 52J of the second rotary table drive source 52 is coupled to the first stage shaft 54 so as to be integrally rotatable.

  The first-stage gear 55 having the same shape is fixed to the upper end portions of the first and second first-stage shafts 53 and 54 so as to be integrally rotatable. Further, the second first stage shaft 54 protrudes greatly upward from the first first stage shaft 53, so that the first stage gear 55 of the second first stage shaft 54 is more than the first stage gear 55 Y of the first first stage shaft 53. It is arranged above.

  Further, first and second relay sleeves 57 and 58 corresponding to the first and second first stage shafts 53 and 54 are rotatably fitted on the outer coaxial axis of the support table shaft 29. Specifically, the first relay sleeve 57 has a cylindrical shape and is rotatably supported on the outside of the support table shaft 29 via a bearing. Further, a second gear 57G1 projects laterally from the lower end of the first relay sleeve 57, and a third gear 57G2 projects laterally from the upper end.

On the other hand, the second relay sleeve 58 is formed in a cylindrical shape shorter than the first relay sleeve 57, and between both ends of the first relay sleeve 57 (that is, the second gear 57G1 and the third gear 57G2). And is rotatably supported via a bearing. Similarly to the first relay sleeve 57, from the lower end portion of the second relay sleeve 58 is the second-stage gear 58G1 projecting laterally 3-stage gear 58G2 are projecting laterally from the upper portion . The second stage gears 57G1 and 58G1 and the third stage gears 57G2 and 58G2 all have the same specifications. The first stage gear 55 of the first first stage shaft 53 meshes with the second stage gear 57G1 of the first relay sleeve 57, and the first stage gear 55 of the second first stage shaft 54 is the second stage of the second relay sleeve 58. It meshes with the gear 58G1.

  A pair of second support holes 30B and 30B penetrates in the vertical direction at positions closer to the center than the first and second rotary table shafts 31 and 32 in the rotary bar 27 described above. First and second idle shafts 59 and 60 corresponding to the first and second relay sleeves 57 and 58 are rotatably supported by the bearings 30B and 30B via bearings.

  The first and second idle shafts 59 and 60 protrude below the rotary bar 27, and the same fourth-stage gears 61 are fixed to the lower end portions of the first and second idle shafts 59 and 60, respectively. Further, the second idle shaft 60 on the second turntable shaft 32 side has a larger amount of protrusion downward from the rotation bar 27 than the first idle shaft 59 on the first turntable shaft 31 side, The fourth gear 61 of the second idle shaft 60 is disposed below the fourth gear 61 of the first idle shaft 59. The fourth gear 61 of the first idle shaft 59 is engaged with the third gear 57G2 of the first relay sleeve 57, and the fourth gear 61 of the second idle shaft 60 is engaged with the second relay sleeve 58. Is engaged with the third gear 58G2. In place of the above configuration, the first and second idle shafts 59, 60 are fixed to the second support holes 30B, 30B of the rotary bar 27, and the first gears 61, 61 are assembled with bearings. The fourth gears 61 and 61 may be rotatably supported by the second idle shafts 59 and 60, and only the fourth gears 61 and 61 may be rotated.

  Furthermore, the last-stage gear 62 having the same shape is fixed to the lower ends of the first and second rotary table shafts 31 and 32 so as to be integrally rotatable. The amount of protrusion of the second rotary table shaft 32 downward from the rotary bar 27 is larger, so that the final gear 62 of the second rotary table shaft 32 is the final of the first rotary table shaft 31. It is arranged below the step gear 62. Then, the final gear 62 of the first rotary table shaft 31 is engaged with the fourth gear 61 of the first idle shaft 59, and the final gear 62 of the second rotary table shaft 32 is the second idle shaft 60. Is engaged with the fourth gear 61.

  With the structure described above, the rotational power of the first rotary table drive source 51 is transmitted to the first rotary table shaft 31, and the first rotary table 41 is rotationally driven. The rotational power is transmitted to the second rotary table shaft 32 and the second rotary table 41 is rotationally driven, and the rotational power of the support table drive source 50 is transmitted to the movable support table 26 and the movable support table 26. The rotary tables 41 and 41 sandwiched between the pair of rotary grindstones 13 and 14 can be exchanged. The subframe 21, the support beam 22, and the support table shaft 29 constitute a “fixed base” of the present invention. The fixed base, the movable support table 26, the support table drive source 50, The “table support mechanism” of the present invention is constituted by the first and second rotary table drive sources 51 and 52.

  Further, by rotating the rotary table 41 at the grinding position, the plurality of workpieces W accommodated in the plurality of workpiece accommodation holes 45 of the rotary table 41 are uniformly ground. Then, a length measuring device 65 for determining whether or not the axial length of the plurality of workpieces W has reached a predetermined reference length is provided on a support arm 80 extending from the grinding apparatus body 11 as shown in FIG. It is supported.

  The support arm 80 includes a first arm 81 that is fixed to one side surface of the grinding apparatus body 11 and protrudes horizontally forward, a rotary shaft 83 that is suspended from the tip of the first arm 81, and a lower end of the rotary shaft 83. And a second arm 82 extending horizontally from the section, and a length measuring device 65 is attached to the tip of the second arm 82. An air actuator 85 is attached to the upper surface of the tip portion of the first arm 81. The air actuator 85 has a rotation output section (not shown) on the lower surface, and the rotation output section is fixed to the upper portion of the rotation shaft 83 so as to be integrally rotatable. Further, the air actuator 85 is provided with a pair of nozzles (not shown). Then, an air valve (not shown) is switched between a state in which air is supplied to one nozzle and a state in which air is supplied to the other nozzle, the second arm 82 is turned, and the length detector 65 is turned on. It moves between a measurement position, which will be described later, and an interference avoidance position.

  The length measuring device 65 has a rod 66 that can move up and down, and a contact disk 67 is provided at the lower end of the rod 66. The outer edge portion of the lower surface of the contact disk 67 is tapered, and the entire lower surface except the outer edge portion is a flat surface. The length measuring device 65 is provided with a lifting device (not shown) that can move the contact disk 67 to an arbitrary height. The lifting device restricts the contact disk 67 from moving downward from an arbitrary height position, and allows upward movement. When the length measuring device 65 is arranged at the measurement position, the contact disk 67 is held on the movable support table 26 at a height position slightly lower than the reference length from the upper surface of the movable support table 26. Then, a plurality (for example, 2 to 3) of work receiving holes 45 of the rotary table 41 at the grinding position are covered. When the rotary table 41 rotates in this state, the workpiece W that has passed between the pair of rotary grindstones 13 and 14 sequentially sinks below the contact disk 67, and the contact disk 67 is pushed up at that time. The axial length of the workpiece W is measured by the amount to be measured.

  In the grinding apparatus 10 of the present embodiment, grinding is performed when the axial lengths of the plurality of workpieces W measured by the length measuring device 65 have reached the reference length (hereinafter referred to as “grinding completion conditions” as appropriate). It is determined that the grinding of the plurality of workpieces W on the rotary table 41 at the position has been completed, and the movable support table 26 rotates to move the rotary table 41 at the grinding position to the grinding facing position. The moving operation will be described in detail later.

  As shown in FIG. 4, the fixed support table 25 is provided with a work discharge port 70 for discharging the work W downward from the work receiving hole 45 of the rotary table 41 at the grinding facing position. The work discharge port 70 is formed by cutting out a position of the fixed support table 25 farthest from the grinding apparatus body 11 into a substantially rectangular shape. Further, the work discharge port 70 is normally closed by a lid body 68 having the same shape as that of the work discharge port 70. The lid body 68 is hinge-connected to the opening edge of the work discharge port 70 at the center side edge of the fixed support table 25, and pivots downward to open the work discharge port 70. Further, when the lid 68 is closed, the upper surface of the lid 68 and the upper surface of the fixed support table 25 are flush with each other. Further, as shown in FIG. 1, an air cylinder 69 as a drive source for opening and closing the lid 68 is provided below the work discharge port 70. The air cylinder 69 is rotatably connected at its lower end to a rib protruding from the outer front surface of the subframe 21, and the linear rod 69 </ b> R of the air cylinder 69 is rotatably connected to a rib provided on the lower surface of the lid 68. Has been. Then, the lid body 68 is opened and closed by the linear motion of the linear motion rod 69R.

  Further, a work discharge duct 71 is provided in front of the outer surface of the subframe 21 so as to surround the air cylinder 69. The upper end portion of the work discharge duct 71 is abutted against the opening edge of the work discharge port 70 from below, and the lower end portion of the work discharge duct 71 is open downward. When the workpiece W is discharged from the workpiece receiving hole 45 of the rotary table 41 to the workpiece discharging port 70 in a state where the workpiece receiving box 72 is disposed below the workpiece discharging duct 71, the workpiece W is guided to the workpiece discharging duct 71. And stored in the work storage box 72.

  Further, the grinding apparatus 10 of the present embodiment is provided with a manual operation button (not shown) for arbitrarily rotating the rotary table 41 at the grinding facing position. Thus, when a new workpiece W is manually inserted into the workpiece accommodation hole 45 after the workpiece W is discharged, the operator arbitrarily rotates the rotary table 41 to insert the workpiece into the workpiece accommodation hole 45. Can be performed efficiently. Since the manual operation button is a two-hand push button, the operator can be prevented from inserting the workpiece W while the rotary table 41 is rotating.

  The grinding apparatus 10 stores the grinding processing program PG1 shown in FIG. 8 in the ROM 91 of the controller 89 shown in FIG. 7, and the CPU 90 executes it to detect the detection result of the length measuring device 65 and the controller 89. Based on the operation information for the console 88, the servo motors 50M, 51M, 52M, the valve 69V (see FIG. 7) connected to the air cylinder 69, and the like are controlled. Note that the console 88 is provided with a setup completion confirmation button and a start button described below.

  Specifically, when the grinding apparatus 10 is stopped, for example, the two rotary tables 41 and 41 are both arranged at the standby position. Then, when a start button (not shown) of the console 88 is turned on, the grinding processing program PG1 is executed, and as shown in FIG. 8, the rotation of one rotary table 41 is started (S11), and the rotary table 41 is moved to the grinding position. The movable support table 26 is rotated 90 degrees so as to be moved to start grinding of the workpiece (S12), and length measurement by the length detector 65 is started (S13). Then, grinding is performed until the length measurement result reaches the reference length (YES loop in S14). When the length measurement result reaches the reference length (NO in S14), the length measurement by the length detector 65 is completed (S15). ), The rotational speed of the rotary table 41 is decelerated (S16).

  When the setup completion confirmation button is turned on after the length measurement result reaches the reference length, for example, until 30 seconds elapse (YES in S17), the rotation of the other turntable 41 is started. Then, the movable support table 26 is driven to rotate 180 degrees (S18, S19), and the one rotary table 41 moved from the grinding position to the standby position is stopped (S20). As a result, the one rotary table 41 and the other rotary table 41 are interchanged, and the grinding of the work on the other rotary table 41 is started. Then, length measurement by the length measuring device 65 is started as described above (S13), and the same processing is repeated thereafter.

  On the other hand, if the setup completion confirmation button is not turned on until 30 seconds have passed after the length measurement result reaches the reference length (NO in S17), the movable support table 26 is rotated 90 degrees. (S21) The two rotary tables 41, 41 are both placed at the standby position, and the one rotary table 41 that has moved from the grinding position to the standby position is stopped (S22). Then, this grinding processing program PG1 ends.

  As described above, in the grinding apparatus 10 of the present embodiment, the processing differs depending on whether the setup completion confirmation button is turned on within a specified time after the grinding completion condition is satisfied in the workpiece W of the rotary table 41 at the grinding position. When the setup completion confirmation button is turned on, the rotating table 41 at the grinding position is replaced and the grinding process is continued. When the setup completion confirmation button is not turned on, the grinding position is changed. The rotary table 41 moves to the standby position, and the two rotary tables 41 and 41 are both arranged at the standby position.

  The CPU 90 when executing the grinding program PG1 corresponds to the “control unit” of the present invention. In the grinding program PG1, step S17 for determining whether or not the setup completion confirmation button is turned on corresponds to the “setup determination means” of the present invention.

This completes the description of the configuration and operation of the grinding apparatus 10 of the present embodiment. The effects of the grinding apparatus 10 are summarized as follows. In other words, as described above, in the grinding apparatus 10, when the grinding completion condition is satisfied, the rotary table 41 moves to the retracted position, and all of the plurality of workpiece receiving holes 45 of the rotary table 41 are arranged outside the grinding space. Therefore, the workpiece W is not continuously ground for a while after the grinding is completed as in the prior art, and the grinding accuracy can be increased as compared with the prior art. Further, the grinding apparatus 10 of the present embodiment includes a plurality of rotary tables 41, 41. When the grinding of the workpiece W of one rotary table 41 arranged at the grinding position is completed, the other rotary table 41 at the standby position is completed. Since the workpiece W of the other rotary table 41 is ground by replacing the one rotary table 41, the workpiece W can be ground efficiently. Moreover, when the other rotary table 41 at the standby position is not completed, the two rotary tables 41 and 41 are both placed at the standby position, so that, for example, the workpiece W is not accommodated. The rotary table 41 is moved to the grinding position, the rotary table 41 containing the ground workpiece W is moved to the grinding position, and the rotary table 41 being set up is ground. The trouble of moving to the position can be eliminated. In addition, from a state in which two rotary tables 41 and 41 are disposed in both the retracted position, that the grinding process by Grinding apparatus 10 has been completed the operator can easily confirm.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various modifications are possible within the scope of the invention other than the following. It can be changed and implemented.

  (1) In the above embodiment, the first and second rotating shafts 31 and 32 are connected to the first and second relay sleeves 57 and 58 by gears. The structure connected with the friction wheel etc. may be sufficient.

  (2) In the above embodiment, the length measuring device 65 is configured to move from the measurement position above the movable support table 26 to the interference avoidance position above the fixed support table 25 in the support table 10H. For example, the length measuring device 65 may be moved up and down on the movable support table 26 to avoid interference with the support sleeve 44 of the rotary table 41.

  (3) In the above embodiment, the support table drive source 50 and the first and second rotary table drive sources 51 and 52 are fixed to the fixed part (support beam 22). (For example, the structure fixed to the movable support table 26) may be sufficient.

  (4) In the above embodiment, when the setup completion confirmation button is turned on within a specified time after the completion of the grinding completion condition, the rotary table 41 at the grinding position is moved to the retracted position and another rotary table 41 is moved. Although it was configured to move to the grinding position, for example, before starting grinding, the unground workpieces W are accommodated in all of the rotary tables 41, 41, and a setup completion confirmation button in advance before starting grinding It may be configured to turn on and start grinding.

  (5) In the above embodiment, the first and second rotary tables 41 and 41 are provided with the two rotary tables 41. However, the rotary table 41 may be one, or three or more. The structure provided may be sufficient.

DESCRIPTION OF SYMBOLS 10 Grinding device 10T Support table 11 Grinding device main body 12 Main frame 13, 14 Rotary grindstone 21 Sub frame 25 Fixed support table 26 Movable support table 29 Support table shaft 31, 32 Rotary table shaft 41 Rotary table 44 Support sleeve 45 Work accommodation hole 50M , 51M, 52M Servo motor 65 Length detector 68 Lid 70 Work outlet W Work

Claims (2)

A rotary table having a plurality of workpiece receiving holes in the outer edge portion;
A pair of rotating grindstones that are rotationally driven in a state of being opposed in the vertical direction across the grinding space;
A support table having an upper surface substantially flush with an upper surface of the lower rotating grindstone,
The rotary table is rotationally driven in a state in which a part of the plurality of work receiving holes is arranged in the grinding space and the remaining work receiving holes are arranged on the support table. In a grinding apparatus in which both ends of the accommodated workpiece are ground by the pair of rotating grindstones,
The rotary table is rotatably supported, and a grinding position in which a part of the plurality of workpiece accommodation holes is arranged in the grinding space, and all of the plurality of workpiece accommodation holes are arranged outside the grinding space. A table support mechanism that is movably supported at a retracted position,
A length detector for measuring the workpiece of the rotary table at the grinding position;
One of the conditions is that the length measurement result of the rotary table at the grinding position reaches the reference length, and the table support mechanism is operated to move the rotary table at the grinding position to the retracted position. And a control unit that moves so that the rotary table is not positioned between the pair of rotating grindstones. The table support mechanism supports a plurality of the rotary tables,
A setup discriminating means for discriminating whether or not the turntable at the retracted position is in a setup completion state in which the unground new workpiece is accommodated in the workpiece accommodation hole;
The control unit sets the rotary table at the grinding position when the length measurement result for the work of the rotary table at the grinding position reaches a reference length and the rotary table at the retracted position is in the setup completion state. The rotary table moved to the retracted position and moved to another grinding table in the set-up completion state to the grinding position, the length measurement result for the workpiece of the rotary table at the grinding position has reached a reference length, and the retracted position 2. The grinding apparatus according to claim 1 , wherein when the rotary table is not in the set-up completion state, the rotary table at the grinding position is moved to the retracted position and all the rotary tables are disposed at the retracted position. .

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