JP6174917B2 - Detection method of grinding wheel refill error to grinding wheel magazine - Google Patents

Description

  This invention detects an error when a grindstone is replenished to an empty holder of a grindstone magazine in a processing apparatus for a hard brittle plate that performs continuous machining while replacing a worn grindstone with a new grindstone held in a grindstone magazine. It is about how to do.

  When manufacturing a mobile terminal in which a camera, microphone, speaker, etc. are arranged in the display panel area, through holes such as circular, elliptical, and rounded round holes that allow light and sound to pass through the glass substrate of the display panel It is necessary to process a recess with a part of the outer periphery. Such through-holes and recesses must be machined using a small-diameter grindstone, and the small-diameter grindstone wears faster than the large-diameter grindstone that performs peripheral machining. As a result, there was a problem that continuous processing for a long time was impossible.

  In order to solve this problem, the applicant of the present application has proposed a peripheral processing apparatus for a hard brittle plate having a grindstone magazine that holds and waits for a plurality of new small-diameter grindstones in Patent Document 1. The proposed processing device has a horizontal feed table that moves in the horizontal direction above a table that holds and rotates a hard brittle plate to be processed, and a tool shaft (via a vertical feed table provided on the horizontal feed table). A grindstone magazine that holds a plurality of small-diameter grindstones that are mounted on the chuck at the lower end of the tool shaft and wears when the small-diameter grindstone mounted on the tool shaft is worn. And a new grindstone held in the grindstone magazine is automatically mounted on the tool shaft. The grindstone magazine has a plurality of grindstone holders for holding a new small-diameter grindstone, and an operator replenishes a new small-diameter grindstone to the empty grindstone holder in a timely manner to continuously process a hard brittle plate. Making it possible.

JP 2013-6245 A

  In the apparatus proposed in Patent Document 1, the through holes and the recesses are processed with only one type of small-diameter grindstone. Therefore, the operator only has to replenish only one kind of small-diameter grindstone in the empty holder of the grindstone magazine.

  However, due to the rapid advancement of mobile terminals, complex processing is required for the glass substrate used for it, and multiple types of small diameter grindstones are used, such as the need to process multiple types of through holes with different diameters. Without it, processing could not be performed.

  Since the grindstone magazine includes a plurality of grindstone holders, continuous processing is possible even if a plurality of types of grindstones are used as long as the plural types of grindstones are held in the grindstone magazine. In this case, when one type of grindstone wears, the tool shaft moves to the grindstone holder that holds the type of grindstone and attaches a new grindstone, and when the other type of grindstone wears, What is necessary is just to move to the grindstone holder in which the kind of grindstone is hold | maintained, and to mount | wear with a new grindstone. This operation can be easily realized only by changing the software by controlling the position of the feed base on which the tool axis is mounted and, if necessary, the tool change position by movement of the grindstone magazine with the NC device. .

  Some glass substrates that can be processed can be processed with one type of small-diameter grindstone. In this case, the grindstone of the same type is held in all of the grindstone holders of the grindstone magazine. Therefore, even if there are a plurality of types of grindstones, the shape of the portion held by the holder is the same even if the types of grindstones are different so that all of them are held by the same holder.

  Adopting the above means, that is, preparing multiple types of grindstones according to the specifications of the workpiece to be processed, and holding multiple types of grindstones in the grindstone magazine, perform multiple tool mounting operations. By registering with the NC device, continuous machining can be realized with the same device, regardless of whether one type of small-diameter grindstone is used or plural types of small-diameter grindstones.

  However, when continuous processing of a hard brittle plate was realized as described above, a new problem occurred. The problem is that when an operator mistakenly refills a grindstone magazine holder with a different kind of grindstone, the error cannot be detected. If there is only one type of small-diameter grindstone used for processing, an operator who replenishes a new grindstone in an empty holder of a grindstone magazine only needs to replenish the one kind of grindstone in an empty holder, which is a simple operation and is erroneous. There is no risk of occurrence. However, if there are multiple types of grindstones to be replenished to the empty holder of the grindstone magazine and the holders are the same, even if an incorrect grindstone is mounted on the empty holder, this can be detected by the machine and the operator. Can not. Therefore, when the machine mounts the wrong wheel at the time of the next whetstone mounting, processing will be continued using that whetstone, especially when the whetstone is mounted during unattended continuous processing at night. Unless an alarm is generated due to an overload or the like and the machine stops, a large number of defective products are generated and a great loss is caused.

  The present invention has been made to solve this problem, and detects that an erroneous grindstone is replenished to a grindstone magazine provided in a hard brittle plate processing apparatus when the grindstone is mounted on a tool shaft. It is an object of the present invention to prevent the occurrence of defective processing due to an error in replenishing the grindstone to the grindstone magazine.

  In the present invention, the grindstones 3a, 3b mounted on the same holder 5 of the grindstone magazine 7 have a dimensional difference for each type, and the dimensions are set when a new grindstone is mounted on the tool shaft 41 (41a, 41b). By confirming with the proximity sensor 73 or the like, the above-mentioned problem is solved by making it possible to detect an error in replenishment of the grindstone before processing is performed using the wrong grindstone.

  A hard brittle plate processing apparatus for carrying out the method of the present invention is automatically mounted on a table 12 for holding a workpiece, a tool shaft 41 for processing a workpiece with the grindstones 3a and 3b held by a chuck 42 at the tip, and a chuck 42. And a grindstone magazine 7 for holding a plurality of new grindstones. The grindstone magazine 7 includes a plurality of grindstone holders 5 having the same shape capable of holding a plurality of types of grindstones 3a and 3b, and a sensor 73 that detects the tip of the grindstone.

  In the present invention, for a plurality of types of grindstones 3a and 3b to be replenished to the grindstone magazine 7, the sizes La and Lb of the respective types of grindstones are registered in the NC device. And when mounting of a new grindstone is instructed from the NC device, after the mounting, the dimension of the grindstone is measured by detecting the dimension of the grindstone with the sensor 73, and compared with the registered dimension. By detecting whether or not a correct grindstone is mounted, a replenishment error of a new grindstone to the grindstone magazine 7 is detected.

  When the grindstone is detected by the sensor 73, the tool shaft 41 is moved to a position where the registered grindstone having the largest dimension is detected. If no grindstone is detected during the movement, the grindstone having the next largest dimension is detected. By performing the stepwise movement operation of moving the tool shaft 41 to the position, it is possible to avoid a situation where the sensor or the grindstone is damaged when an erroneous grindstone is replenished.

  When the wrong type of grindstone is replenished to the holder 5 of the grindstone magazine 7, the tool shaft 41 can automatically recognize whether it is the right type of grindstone after automatically mounting the grindstone. Therefore, it is possible to prevent the grinding wheel from being damaged and processing of defective products due to an error in replenishing the grinding wheel magazine 7 with a new grinding stone can be avoided.

  In addition, all types of grindstones that may be used by machines can be held in a plurality of holders of a grindstone magazine, and when only one type of grindstone is used, all holders may be replenished with the same type of grindstone. Continuous processing can be performed with the same operations and operations as. In addition, there is an effect that the replenishment error of the grindstone can be detected by the same sensor and operation as those used for the detection of the breakage of the grindstone.

The front view which shows an example of the apparatus which enforces the method of this invention The top view of the apparatus of FIG. 1 which shows the positional relationship of each apparatus. The figure which showed the cross section of the grindstone holder, and the side surface of the 1st type small diameter grindstone held by this A view similar to FIG. 3 for the second type of small-diameter grindstone

  1 and 2 are diagrams showing an example of a hard brittle plate processing apparatus for carrying out the method of the present invention, which is the same apparatus as the apparatus proposed in Patent Document 1, but with a large diameter grindstone mounted thereon. This is different from the apparatus exemplified in Patent Document 1 in that it includes a large-diameter grindstone drive shaft 46 and two small-diameter grindstone tool shafts 41a and 41b for mounting a small-diameter grindstone.

  The outline of the apparatus shown in the drawing is as follows. Reference numeral 1 denotes a work shaft in the vertical direction, which is supported by a machine frame. A table 12 that holds the workpiece (hard brittle plate) horizontally is fixed to the upper end of the workpiece shaft 1. A spindle motor (servo motor) 15 is connected to the lower end of the work shaft 1. A lateral feed base 21 is disposed above the work shaft 1. The lateral feed base 21 is guided by a horizontal lateral guide provided on the machine frame, and is screwed to a lateral feed screw 24 that is rotationally driven by a lateral feed motor (servo motor) 23.

  The horizontal feed table 21 is provided with a vertical feed table 25. The vertical feed base 25 is screwed into a vertical feed screw 27 that is rotationally driven by a vertical feed motor (servo motor) 26 and moves up and down in the vertical direction. The vertical feed base 25 is provided with one large-diameter grindstone driving shaft 46 vertically downward and two small-diameter grindstone tool shafts 41a and 41b. The large-diameter grindstone drive shaft 46 is directly supported by the vertical feed table 25, and the tool shafts 41a and 41b for the small-diameter grindstone are pivotally supported via the lift platforms 28a and 28b. Elevating cylinders 29a and 29b for elevating and lowering these components independently are provided on each elevating table 28a and 28b.

  A large-diameter grindstone 45 is attached to the lower end of a large-diameter grindstone drive shaft 46 that is directly supported by the vertical feed base 25, and the upper end thereof is connected to a large-diameter grindstone drive motor 48 by a toothed belt 47. . A collet chuck 42 that holds the small-diameter grindstones 3a and 3b is provided at the lower ends of the tool shafts 41a and 41b that are pivotally supported by the elevators 28a and 28b, respectively. The tool shafts 41a and 41b are integrated with the rotor shafts of the brushless motors 4a and 4b mounted on the lifting platforms 28a and 28b, and the brushless motors 4a and 4b incorporate a cylinder for opening and closing the chuck 42.

  The axis of the work shaft 1, the axis of the tool axes 41 a and 41 b, and the axis of the large-diameter grindstone drive shaft 46 are located on the same vertical plane s parallel to the moving direction of the lateral feed base 21. A grindstone mounting position for receiving a small-diameter grindstone from a grindstone magazine holder, which will be described later, to the chuck 42 of the tool shafts 41a and 41b is also located on the vertical surface s.

  When machining the workpiece with the large-diameter grindstone 45, the elevators 28a and 28b are lifted by the lift cylinders 29a and 29b, and the machining is performed in a state where the small-diameter grindstones 3a and 3b are retracted to an upper position that does not interfere with the workpiece. On the other hand, when processing a workpiece with the small-diameter grindstone 3a or 3b, the hoisting table on which the small-diameter grindstone used in the lift cylinder 29a or 29b is lowered, and an upper position where the small-diameter grindstone and the large-diameter grindstone that are not used do not interfere with the workpiece. Evacuate to process.

  In any processing, the NC device 6 controls the position of the lateral feed base 21 and the rotation angle of the work shaft 1 in association with each other to perform processing of a desired planar shape. The through hole is processed by lowering the small-diameter grindstone 3a for boring from above the workpiece by the vertical movement of the vertical feed base 25.

  The grindstone magazine 7 that holds the new small-diameter grindstones 3a and 3b includes a top plate 71 at the upper end, and a plurality of rows of grindstone holders 5 are arranged on the top plate in a direction parallel to the feed direction of the lateral feed table 21 (example in the figure). The column selection device 74 is provided for selecting a column. The row selection device 74 moves the top plate 71 in a direction orthogonal to the feed direction of the lateral feed base 21 to position the axes of the plurality of grindstone holders 5 in the selected row on the vertical plane s. That is, any one axial center of the plurality of grindstone holders 5 in which the axis of the tool shaft 41a or 41b is arranged in two rows on the vertical plane s by the advance / retreat of the row selection device 74 and the movement of the lateral feed base 21. Can be matched. This matched position is a grindstone mounting position on the tool shaft 41a or 41b.

  A top plate 71 of the grindstone magazine is provided with a height adjusting screw (not shown) for adjusting the table height with respect to the machine frame and a proximity sensor 73 for detecting the relative height with respect to the lifting platforms 28a and 28b. Has been.

  3 and 4 are cross-sectional side views of the grindstone holder 5 shown in a state where different types of small-diameter grindstones 3a and 3b are held. A small-diameter grindstone 3a shown in FIG. 3 is a grindstone for forming a through-hole, and can process through-holes having different diameters on the front end side and the base end side (upper side in the drawing). A small-diameter grindstone 3b in FIG. 4 is a grindstone that processes the inner peripheral edge of a through hole or a recess, and includes circumferential grooves having different diameters on the distal end side and the proximal end side. These grindstones are used when the grindstone is detached from the cone rod 33 held by the holder 5 and the chuck 42 between the grindstone main body portion 31 electrodeposited with abrasive grains and the upper portion 32 held by the chuck 42. And a disc cage 34. The conical rod 33 is formed by a conical upper surface 53 and a conical lower surface 52 connected to the large diameter side.

  Starting with the grindstones 3a and 3b exemplified above, a plurality of types of small-diameter grindstones that may be mounted on one processing apparatus have different lengths La and Lb, respectively.

  The holders 5 are all the same shape and have a structure in which the grindstones 3a and 3b are held in a vertical posture by the conical rod 33 portion of the small-diameter grindstone. The holder 5 includes an upward conical concave surface 55 provided with a through hole 54 through which the grindstone main body portion 31 can pass. The conical concave surface 55 has an apex angle equal to the conical lower surface 52 of the conical bowl. Above the conical concave surface 55 of the grindstone holder 5, a ball plunger 57 having a spring that biases the ball 56 toward the axis at an interval of 120 degrees is provided. The three ball plungers 57 are provided at positions where the ball 56 at the tip is pressed against the conical upper surface 53 of the conical scissors when the conical bottom surface 52 of the conical scissors is engaged with the conical concave surface 55 of the grindstone holder.

  When the operator refills the empty holder of the grindstone magazine 7 with a new grindstone, the grindstone main body portion 31 is simply inserted into the empty holder. The main body portion 31 of the inserted grindstone passes through the through hole 54, and the ball plunger ball 56 is pushed by the conical lower surface 52 of the conical rod 33, and the ball passes through the maximum diameter portion of the conical rod 33, and then the cone The lower surface 52 contacts the conical concave surface 55 of the holder. At this time, the ball 56 of the ball plunger is positioned so as to press the conical upper surface 53 of the conical rod 33. In this state, the grindstones 3 a and 3 b are held by the grindstone holder 5 in a state where the conical lower surface 52 is pressed against the conical concave surface 55 by the component force of the pressing force acting on the conical upper surface 53 of the conical basket from the ball 56. .

  The NC device 6 registers the lengths La and Lb of the plural types of grindstones 3a and 3b held in the grindstone magazine 7 and the mounting operation when the grindstone is automatically mounted on the tool shafts 41a and 41b. Means 61 are provided. For example, in the grindstone magazine 7 shown in FIG. 2, the grindstone 3a attached to the tool shaft 41a is held in the holder 5 in the upper row in FIG. 2, and the grindstone 3b attached to the tool shaft 41b is held in the holder 5 in the lower row. In the NC device 6, the length La of the grindstone 3a and the operation of the column selecting device 74 when it is mounted, that is, the upper column center a in FIG. The registration means 61 registers the operation of moving the lateral feed base 21 so that the axis of the tool axis 41a coincides with the axis of the holder in this row. For the grindstone 3b, the length Lb and the row center b of the holder holding the grindstone 3b by the row selection device 74 are positioned on the vertical surface s, and the axis of the tool shaft 41b is set to the axis of the holder. The registration unit 61 registers the operation of moving the lateral feed base 21 so as to match.

  Further, the NC device 6 is provided with a grindstone detecting means 62 for the mounted grindstone and a correctness / incorrectness judging means 63 for the mounted grindstone. The grindstone detecting means 62 is called immediately after a new grindstone is mounted on the tool shafts 41a and 41b. In this procedure, the vertical feed base 25 is lowered to a position where the tip of the registered maximum-length grindstone is detected by the proximity sensor 73 and the output of the proximity sensor 73 is confirmed, and the proximity sensor 73 detects the grindstone tip. In this case, the detection signal is sent to the correctness determination means 63. If there is no detection signal for the grindstone tip, the next long grindstone tip is lowered to a position where it is detected by the proximity sensor 73, and the signal from the proximity sensor 73 is confirmed. If there is a detection output, a detection signal is sent to the correctness determination means 63. In the above example, only two types of whetstones are used, so one of the whetstones is detected by a two-step descent operation. However, if there are many types of whetstones, the vertical feed table descent operation and the tip of the whetstone are the same as the number of whetstone types. The detection operation is repeated.

  The grindstone correctness determination means 63 calculates the length of the grindstone from the position of the vertical feed base 25 when the grindstone tip is detected, and the grindstone length calculated corresponds to the grindstone mounting operation performed immediately before. If it matches, the continuous machining is continued, and if it does not match or the tip of the grindstone cannot be detected, a warning is issued and the machine is stopped.

  Next, the exchange operation of the small-diameter grindstone 3 in the apparatus having the above structure will be described. When the grindstone replacement command for the small-diameter grindstone 3a or 3b is output from the NC device 6, the machining of the workpiece being processed is finished and the workpiece is unloaded from the table 12, and then the tool axis 41a or The lateral feed base 21 moves until 41b reaches a predetermined workpiece discharge position, and the chuck 42 of the tool shaft 41a or 41b is opened at that position to raise the elevating base 28a or 28b. The disc cage 34 is hooked by a bar 76 provided at the position to prevent the disk rod 34 from moving upward, and the worn grindstone is discharged to the collection box 77.

  The lateral feed base 21 further moves in accordance with a grindstone mounting operation registered corresponding to the grindstone to be exchanged so that the axis of the tool shaft 41a or 41b faces one axis of the holder 5 of the grindstone magazine. The vertical feed base 25 is lowered in a state where 28a or 28b is lowered. Then, when the proximity sensor 73 detects a predetermined lowering position of the vertical feed base 25, the vertical feed base 25 stops descending, the chuck of the tool shaft 41a or 41b is closed, and a new small diameter held by the grindstone holder 5 is reached. Hold the wheel axis of the wheel. In this state, when the vertical feed base 25 is raised, the grindstone 3a or 3b gripped by the tool shaft 41a or 41b is detached from the grindstone holder 5 and transferred to the tool shaft 41a or 41b.

  Next, the tool axis on which the new grindstone is mounted is moved above the proximity sensor 73, the above-described grindstone detecting means 62 is operated, and then the correctness determination means 63 is operated, whereby the tool axis 41a or 41b is of the wrong type. When the grindstone is gripped, an alarm is issued and the machine stops. If the grindstone is definitely refilled in the grindstone magazine, the machine will not stop due to a refill error, and continuous operation will continue.

  As described above, according to the present invention, without adding a new detector to the conventional device, the software registered in the NC device is added, and the detector of the conventional device is used to the grindstone magazine. It is possible to detect the replenishment error of the whetstone, and it is possible to realize the same processing cycle time as that of the conventional apparatus that detects breakage of the whetstone by detecting the tip of the whetstone when a new whetstone is mounted.

3a, 3b Whetstone 5 Whetstone holder 7 Whetstone magazine 12 Table 41 (41a, 41b) Tool axis 42 Chuck 73 Proximity sensor La, Lb Whetstone dimensions

Claims (2)

A grindstone magazine provided with a table, a plurality of grindstone holders and a sensor for detecting the grindstone tip, and a tool axis mounted on the transverse feed table via a vertical feed table positioned by a command of the NC device, A method for detecting an error in replenishment of a grindstone to a grindstone magazine in a hard brittle plate processing apparatus having a tool shaft that automatically mounts a grindstone held on the grindstone magazine and processes the hard brittle plate held on the table. And
For each type of grindstone held in the grindstone magazine, the grindstone length is registered in the NC unit, and after the grindstone held in the grindstone magazine is automatically mounted on the tool shaft, the tip of the grindstone held by the sensor on the tool shaft The height of the vertical feed base is lowered to the height at which the tool is detected, and the grindstone length calculated from the height of the vertical feed base when the sensor detects the grindstone is compared with the registered grindstone length to newly add to the tool axis. A method for detecting an error in replenishment of a grindstone to a grindstone magazine for judging whether a mounted grindstone is correct or incorrect.   When lowering the vertical feed table, the vertical feed table is gradually lowered from the height at which the sensor detects the tip of the longest grindstone registered in the NC device to the height at which the tip of the shortest grindstone is detected. The method for detecting a grinding wheel refill error according to claim 1.

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