JP2009214214A - Door device of machine tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a door device of a machine tool, which contributes to shortening of the time necessary for closing a door, and accordingly to shortening of the non-operating time of the machine tool. <P>SOLUTION: The door device 27 has: the door 28 which is movable between an open position for opening an opening section 26 formed in a splash guard 23 covering the periphery of the machine tool, and a closed position for closing the same; and an air cylinder 40 for generating driving force for moving the door 28 from the open position to the closed position. Herein a closure completion time T necessary for the door 28 to move from the open position to the closed position by the driving force of the air cylinder 40 and to be stationary and stabilized, is measured, and while a value of the driving force by the air cylinder 40 is successively varied, an optimum value of the driving force is determined based on the closure completion times measured according to the various values of the driving force. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a door device for a machine tool that opens and closes an opening provided in a cover of the machine tool.

  In general, a machine tool has a cover for preventing scattering of oil, work pieces, and the like. The cover includes an opening, and a door that opens and closes the opening is provided. As a prior art regarding the door device of the machine tool which opens and closes a door, there exists a thing of patent document 1, for example.

In the door device of this prior art machine tool, an operator manually opens and closes a door provided at an opening of a cover (splash guard). The door moves between an open position that opens the opening and a closed position that closes the opening. In this prior art, a buffer cylinder (air cylinder) is provided as an impact absorbing means so as to minimize the impact and vibration when the door reaches the closed position.
JP 2001-277069 A

  In the above prior art, the door is manually opened and closed, but in recent years, there is a door that automatically opens and closes to improve work efficiency. As a driving means for applying a driving force for opening and closing, there is an air cylinder or the like. The greater the driving force of the drive means, the faster the door will move. However, when the door reaches the closed position, the door will bounce when it reaches the closed position. Becomes longer. On the other hand, if the driving force of the driving means is reduced in order to suppress the rebound, the speed of movement of the door is reduced, and the movement time until the door reaches the closed position from the open position becomes longer. Therefore, in order to shorten the total time required for the door closing operation, it is necessary to set the driving force of the driving means to an optimum value that is not too small and not too small.

  The above prior art is intended to reduce the impact and vibration in the manual door, and is not particularly considered about shortening the time required for the door closing operation of the automatic door as described above.

  An object of the present invention is to provide a door device for a machine tool in which a driving force for driving an automatic door is set to an optimum value and the time required for the door closing operation can be shortened.

  To achieve the above object, according to a first aspect of the present invention, there is provided a door device for a machine tool for opening and closing an opening provided in a cover that covers the periphery of a machine tool, and an opening position for opening the opening and the opening. A door provided movably between a closed position for closing the door, a drive means for generating a drive force for moving the door from the open position to the closed position, and a drive force of the drive means. While the door is moved from the open position to the closed position, the time measuring processing means for measuring the closing completion time until the door is stationary and stable in the closed position, and the driving force value by the driving means are sequentially changed, Driving force determining means for determining an optimum value of the driving force value based on the closing completion time measured by the time measuring means corresponding to each driving force value.

  The door device for a machine tool according to the first invention of the present application has driving means for generating a driving force. The door moves from the open position to the closed position by the driving force of the driving means. The greater the driving force of the driving means, the faster the speed of movement of the door, but the longer it takes for the door to reach the closed position and stabilize at the closed position. When the time until the stationary stabilization becomes longer, the closing completion time from when the door starts to move from the opened position to when the door is stationary and stabilized at the closed position becomes longer. The smaller the driving force of the driving means, the slower the speed of movement of the door, and the shorter the time from when the door reaches the closed position until it is stationary and stabilized at the closed position. If the movement is delayed, the movement time until the door reaches the closed position becomes longer, and therefore the closing completion time becomes longer.

  The door device for a machine tool according to the first invention of the present application includes a time measuring means and a driving force determining means. The driving means sequentially changes the driving force value, and the time measuring means measures the closing completion time corresponding to each driving force value. The driving force determining means determines an optimum value of the driving force value of the driving means based on the closing completion time measured corresponding to each driving force value. Thereby, the driving force determination means can determine the driving force value so that the closing completion time becomes the shortest. As a result, the time required for the door closing operation can be shortened, and the non-working time of the machine tool can be shortened. Further, since the operator does not inadvertently increase the driving force, it is possible to prevent the durability of the door device from being lowered due to the bounce when the door reaches the closed position.

  According to a second invention, there is provided drive control means for controlling the drive means in the first invention, and the timing processing means causes the drive control means to sequentially change the drive force of the drive means into a plurality of drive force values. Storage means for measuring the closing completion time at each driving force value and storing a plurality of closing completion times measured by the timing processing means corresponding to each of the plurality of driving force values, The force determining means determines the driving force value that gives the shortest closing completion time among the plurality of closing completion times stored in the storage means as the optimum value.

  The door device for a machine tool according to the second invention of the present application includes drive control means and storage means. The drive control means controls the drive means and sequentially changes the drive force into a plurality of drive force values. The time measuring means measures a closing time corresponding to each driving force value. The storage means stores a closing completion time corresponding to each driving force value. The driving force determining means selects the shortest closing completion time among the plurality of closing completion times stored in the storage means, and determines the driving force value corresponding to the selected closing completion time as the optimum driving force value of the driving means. To decide. Thereby, the time required for the door closing operation can be shortened, and the non-working time of the machine tool can be shortened.

  In a third aspect based on the second aspect, after the driving force determining means determines the optimum value, the driving control means controls the driving means so that the driving force becomes the optimum value. It is characterized by.

  By controlling the driving force of the driving means to the optimum value by the drive control means, the time required for the door closing operation can be automatically minimized even if the operator does not perform a special operation.

  According to a fourth aspect of the present invention, in the second aspect of the present invention, after the driving means that can operate the driving force of the driving means via the driving control means and the driving force determining means determines the optimum value, the driving control means And display means capable of displaying operation information of the operating means for setting the driving force of the driving means to the optimum value.

  The door device for a machine tool according to the fourth invention of the present application includes an operation means and a display means. When the driving force determining means sets the optimum value of the driving force of the driving means, the display means displays operation information for realizing the optimum value. When the operator who sees the display operates the operation unit according to the operation information, the drive control unit can control the driving force of the drive unit to an optimum value. As a result, the time required for the door closing operation can be reliably minimized by the operator's own operation while confirming the operator's intention.

  According to a fifth invention, in any one of the first to fourth inventions, there is provided a closing detection means for detecting that the door is in the closed position, and the time measurement processing means includes a detection result of the closing detection means. Based on the above, the closing completion time is measured.

  Closure detection means detects that the door is in the closed position. Using the detection result, the time measuring processing means can grasp that the door has moved to the closed position and has been stationary and stable at the closed position, and can measure the closing completion time.

  A sixth invention is characterized in that, in the fifth invention, the closing detection means is a limit switch for detecting a mechanical contact state of the door.

  By using the contact type limit switch, it can be mechanically reliably detected that the door is in the closed position.

  In a seventh aspect based on the fifth or sixth aspect, after the drive control means inputs the movement command signal for moving the door to the closed position, the time-counting means first starts the closing detection means. A closing time measuring means for measuring a closing time until the closing position of the door is detected is provided.

  One of the factors that determine the length of the closing completion time is the movement time of the door from the open position to the closed position. The greater the driving force of the driving means, the faster the moving speed of the door, and the smaller the driving force of the driving means, the slower the moving speed of the door. In the door device for a machine tool according to the seventh aspect of the present invention, the timing processing means includes a closing time measuring means, and measures the time from when the movement command signal is input (corresponding to the start of movement from the opening position) until the closing position is detected. As a result, the travel time from the open position to the closed position can be measured.

  In an eighth aspect based on the seventh aspect, the time measuring means has a predetermined time during which the closing detecting means detects the closing position of the door after the closing time measuring means measures the closing time. And determining means for determining whether or not the threshold value has been reached.

  As one of the factors that determine the length of the closing completion time, there is a time (= stabilization time) until the bounce settles and stabilizes after moving from the open position and reaching the closed position. The larger the driving force of the driving means, the larger the impact force when reaching the closed position, so the time until the bounce is settled is longer. The smaller the driving force of the driving means, the smaller the impact force when reaching the closed position, so the bounce is settled. The time is short. In any case, in order to consider that the bounce is settled, the state where the door is in the closed position needs to continue for a certain period of time. In the door device for a machine tool according to the eighth invention of this application, the time measuring means includes a determining means, and determines whether or not the detection time of the closed position has reached a predetermined threshold value. Thereby, it can be considered that the bound is settled when the detection time of the closed position reaches the threshold value and the determination is satisfied.

  A ninth invention is the stabilization according to the eighth invention, wherein the time measuring means measures a stabilization time until the judgment of the judging means is satisfied after the closing time measuring means measures the closing time. A time measuring means is provided.

  In the machine tool door device according to the ninth aspect of the present invention, the time measuring means includes the stabilization time measuring means, and the time from when the closed position is detected until the judgment by the judgment means is satisfied (until the time when it can be considered that the bounce is settled). Measure. As a result, the stabilization time until the bounce is settled can be measured.

  According to the present invention, the driving force for driving the automatic door can be set to an optimum value, and the time required for the door closing operation can be shortened.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a side view showing a machine tool provided with an embodiment of the door device of the present invention.

  In FIG. 1, a machine tool 21 and a splash guard 23 (cover) surrounding the front, rear, left and right of the machine tool 21 are provided on a base 22 (in FIG. 1, the splash guard 23 is provided at the front portion of the machine tool 21. Only the part that is located is shown). Above the index table 24 on the base 22, an inner door 25 is provided that partitions the splash guard 23 forward and backward at a position in front of the machine tool 21.

  In the front wall portion (left side in FIG. 1) of the splash guard 23, an opening portion 26 for taking in and out the workpiece is formed in the splash guard 23. The door device 27 of this embodiment is for opening and closing the opening 26. The door device 27 includes a door 28 made of, for example, an iron plate that can be moved in the opening and closing direction (sliding movement in this example; the same applies hereinafter). The door 28 has a vertically long rectangular shape (in this example) that is large enough to close the opening 26. A glass window 30 is provided in the upper half of the door 28 (see FIG. 3 described later), and a handle 31 is provided in the lower left part of the front surface of the door 28.

  As shown in FIGS. 2 and 3, a guide rail 32 extending horizontally in the left-right direction is provided at an upper position of the door 28 inside the front wall portion of the splash guard 23. The guide rail 32 has a length that reaches from the vicinity of the right edge of the opening 26 of the splash guard 23 to the vicinity of the left wall. A mounting bracket 33 attaches the guide rail 32 to the front wall portion of the splash guard 23.

  A flange 38 having a U-shaped cross section is fixed to the upper end of the door 28. On the side plate 38a of the flange 38, a pair of upper and lower rollers 34 that rolls so as to sandwich the guide rail 32 from both upper and lower sides are rotatably provided. The rollers 34 are installed in two horizontal pairs on the left and right sides of the side plate 38a of the flange 38 with a gap in the horizontal direction.

  The door 28 is attached to the inside of the front wall portion of the splash guard 23 so as to be movable along the guide rail 32. The door 28 is movable (sliding movement in this example) to a closed position where the opening 26 of the splash guard 23 is closed and an open position where the opening 26 of the splash guard 23 is opened. As shown in FIG. 1, a regulating member 35 that regulates the swinging of the door 28 in the front-rear direction is provided at the lower portion of the door 28. Although detailed description is omitted, the restricting member 35 includes a rail in the left-right direction having a groove provided inside the lower end edge of the opening 26 of the splash guard 23, and a roller that rolls in the groove. .

  An air cylinder 40 (driving means) for driving the door 28 is provided on the inside of the front wall portion of the splash guard 23. At a position above the flange 38 at the upper end of the door 28, the air cylinder 40 is disposed horizontally from the right side of the opening 26 to the right wall of the splash guard 23. The rod 40 a fixed to the piston 40 b of the air cylinder 40 protrudes from the tip of the air cylinder 40. A mounting portion 40 c fixes the rod 40 a to the middle portion of the flange 38 at the upper end of the door 28. The air cylinder 40 is divided into a front chamber 41a and a rear chamber 41b by a piston 40a. The front chamber 41a and the rear chamber 41b are connected to air pipes 42a and 42b from an air valve 43 (drive control means) for controlling the air cylinder 40, respectively.

  The air valve 43 is, for example, a switching valve that controls the switching of the compressed air outflow port and the flow rate of the compressed air by moving the spool. The air valve 43 is connected to a pressure source 44 including, for example, a compressor and a pressure suppressor. When the air bubble 43 is switched to the air piping 42b side, the compressed air from the pressure source 44 is sent into the rear chamber 41b of the air cylinder 40. Then, the rod 40a moves forward, and the door 28 is driven to the left along the guide frame 32 via the flange 38 as shown in FIG. As a result, the door 28 moves to an open position where the opening 26 of the splash guard 23 is opened. When the air valve 43 is switched to the air piping 42 a side, compressed air from the pressure source 44 is sent into the front chamber 41 a of the air cylinder 40. Then, the rod 40a moves backward, and the door 28 is driven rightward along the guide frame 32 via the flange 38, as shown in FIG. As a result, the door 28 moves to the closed position where the opening 26 of the splash guard 23 is closed. The driving force of the door 28 by the air cylinder 40 can be adjusted by changing the opening of the fluid passage by the spool of the air valve 43 and changing the flow rate of the compressed air supplied to the air cylinder 40.

  On the inner side of the front wall of the splash guard 23, a limit switch 46 (closed detecting means) made of, for example, an interlock switch is installed at the upper end position of the right edge of the opening 26. The limit switch 46 detects that the door 28 has reached the closed position and closed the opening 26. The dog 46a of the limit switch 46 is attached to the upper end position on the right side surface of the door 28. When the door 28 is closed, the dog 46a pushes the limit switch 46 to perform switching.

  The limit switch 46 is connected to a control device 50 provided in the machine tool 21. The control device 50 can control the flow rate of the compressed air supplied to the air cylinder 40 by adjusting the set value of the air valve 43 based on the output signal of the limit switch 46. An operation panel 56 (operation means) provided on the machine tool 21 is connected to the control device 50. The operation panel 56 is provided with switch buttons for operating each part of the machine tool 21 such as a door closing button.

  As shown in FIG. 5, the control device 50 includes a CPU 53, a ROM 54, and a RAM 55 (storage means) to which an input interface 51 and an output interface 52 are connected. The CPU 53 controls the main shaft motor 68, the X-axis motor 69, the Y-axis motor 70, the Z-axis motor 71, and the C-axis motor 72 via the respective servo amplifiers 64, 65, 66, 67, 73. As a result, the three-axis control in the X-axis direction, the Y-axis direction, and the Z-axis direction and the rotation control of the index table 24 are performed on the tool attached to the lower end of the drive unit main body 21A of the machine tool 21, and the index table 24 A workpiece (not shown) installed at 24 is machined.

  In the CPU 53, ROM 54, and RAM 55, an operation panel 56, a spindle encoder 57, an X-axis encoder 58, a Y-axis encoder 59, a Z-axis encoder 60, a C-axis encoder 74, a temperature sensor 61, and a limit switch 46 are input side devices. Are connected via an input interface 51. A display device (display means) 62, a display lamp 63, and a valve actuator 80 are connected to the CPU 53, ROM 54, and RAM 55 as output side devices via the output interface 52. Further, as described above, the CPU 53, the ROM 54, and the RAM 55 include a servo amplifier 64 and a servo amplifier 65 that control the spindle motor 68, the X axis motor 69, the Y axis motor 70, the Z axis motor 71, and the C axis motor 72, respectively. The servo amplifier 66, the servo amplifier 67, and the servo amplifier 73 are connected.

  In the above basic configuration, the feature of the door device 27 of the present embodiment is that the setting relating to the flow rate of the air valve 43 that controls the driving force of the air cylinder 40 in order to shorten the time required for closing the door 28 of the splash guard 23. Is to change the value. Specifically, the total closing completion time from the start of the movement of the door 28 to the stationary stabilization at the closing position is minimized by the trial and error control method. The principle of the present invention will be described with reference to FIG.

  When the door 28 is driven by the air cylinder 40 to move from the open position to the closed position, the movement speed of the door 28 increases as the driving force of the air cylinder 40 increases. For this reason, as shown to Fig.6 (a), time (closing time) t1 until the door 28 arrives at a closing position after starting closing becomes short. However, when the moving speed is high, the impact force when the door 28 reaches the closed position increases. For this reason, the time (stabilization time) c1 from when the door 28 reaches the closed position until the bounce settles and stabilizes becomes longer, and after the door 28 starts moving from the open position, the door 28 stops at the closed position. The total closing completion time T (= t1 + c1) until stabilization is increased.

  In FIG. 6A, reference sign c2 is a duration time (= close duration time) in which the door 28 is in the closed position, which can be considered that the bounce of the door 28 has been settled. The closing duration time c2 is determined to be a predetermined value in advance for each door 28 of the machine tool 21, for example (the same applies to FIGS. 6B and 6C below).

  The detection that the door 28 is in the closed position is detected by turning on the limit switch 46 provided on the inner side of the front wall portion of the splash guard 23 by the dog 46a provided on the door 28 (the input of the limit switch 46 is ON). Is detected by the control device 50.

  On the other hand, when the driving force of the air cylinder 40 is small, the speed of movement of the door 28 is slowed down, and the impact force when the door 28 reaches the closed position becomes small. For this reason, as shown in FIG. 6B, the stabilization time c1 is shortened. However, since the closing time t1 becomes longer when the movement is delayed, the total closing completion time T from when the door 28 starts moving from the open position to when it is stabilized at the closed position is not so short.

  On the other hand, by adjusting the driving force of the air cylinder 40 that defines the speed of movement of the door 28, as shown in FIG. 6C, the closing time t1 is not long and the stabilization time c1 is not long. If controlled, the total closing completion time T from when the door 28 starts to move from the open position to when the door 28 is stabilized at the closed position can be shortened.

  Therefore, in the present embodiment, the closing completion time T is shortened by changing the set value (valve opening degree) related to the flow rate of the air valve 43 that adjusts the driving force of the air cylinder 40 by a try-and-error method. . In order to perform this control, the CPU 53 of the control device 50 includes a t1 counter, a c1 counter, and a c2 counter. Hereinafter, the control of this embodiment will be described with reference to the flowchart shown in FIG. FIG. 7 shows details of a control procedure executed by the CPU of the control device 50.

  In the flowchart of FIG. 7, first, in step S10, the CPU 53 clears the values of the t1 counter, the c1 counter, and the c2 counter. Further, the CPU 53 reads the c2 counter set value c2s (predetermined threshold value), the closing completion time set value Ts, and the valve set value Bs of the air valve 43 at this time stored in advance in the RAM 55. The valve set value Bs is the flow rate of the compressed air supplied to the air cylinder 40, and the past set value is stored in the RAM 55 (see step S75 and step S80 described later. If there is no set value stored in the past). , And a predetermined initial value determined in advance).

  In next step S <b> 15, the CPU 53 determines whether or not the operator has turned on the door closing button of the operation panel 56. Until the operator presses the door closing button of the operation panel 56, the determination in step S15 is not satisfied, and the loop waits. When the operator presses the door closing button on the operation panel 56, the determination in step S15 is satisfied, and the process proceeds to the next step S20.

  In step S20, the CPU 53 outputs a door closing command to the air valve 43, and starts counting the closing time t1 with the t1 counter. In response to the door closing command from the CPU 53, the air valve 43 supplies the compressed air from the pressure source 44 to the front chamber 41a of the air cylinder 40 at a flow rate of the valve set value Bs. Accordingly, the air cylinder 40 drives the door 28 to start closing, and the door 28 moves toward the closed position.

  In the next step S25, it is determined whether or not the limit switch 46 has been turned on. When the door 28 reaches the closed position and the dog 46a pushes the limit switch 46, an input signal of the limit switch 46 is output to the CPU 53 (Yes in step S25), and the process proceeds to the next step S30.

  In step S30, the counting of the closing time t1 by the t1 counter is stopped. As a result, the closing time t1 (= time from the output of the door closing command to the first input of the limit switch 46) from the start of closing the door 28 until reaching the closed position is measured. When the counting of the closing time t1 is stopped in step S30, the process proceeds to the next step S35.

  In step S35, counting of the stabilization time c1 by the c1 counter is started, and in the next step S40, counting of the closing duration c2 by the c2 counter is started.

  Thereafter, in step S45, it is determined whether or not the c2 count value of the c2 counter has reached the set value c2s (threshold value). When the c2 count value reaches the set value c2s, the door 28 can be regarded as stationary stabilization because the bounce is settled. Thus, when the c2 count value reaches the set value c2s, the closing completion time T (= t1 + c1) from when the door 28 starts moving from the opening position to when it is stationary and stabilized at the closing position is determined. While the c2 count value of the c2 counter does not reach the set value c2s (threshold value) (No in step S45), the process proceeds to step S50.

  In step S50, it is determined whether or not the limit switch 46 is turned off. If the door 28 that has reached the closed position has bounced, the limit switch 46 is turned off (Yes in step S50), the c2 counter is initialized to 0 in the next step S55, and the process proceeds to step S60. On the other hand, if the door 28 that has reached the closed position has not bounced, the limit switch 46 is not turned off (No in step S50), so the process returns to step S45 and the same procedure is repeated.

  In step S60, it is determined whether or not the limit switch 46 is turned on. When the door 28 that has reached the closed position and bounces back returns to the closed position, the limit switch 46 is pushed again by the dog 46a and is turned on (Yes in step S60), so the process returns to step S40 and the same procedure is repeated. While the door 28 does not return to the closed position (being bound), the answer is No in step S60 and the loop waits.

  On the other hand, when the c2 count value of the c2 counter reaches the set value c2s (threshold value) in step S45 (Yes in step S45), the process proceeds to step S70. In step S70, in response to the c2 count value reaching the set value c2s in step S45, the closing completion time T (= t1 + c1; the closing time t1 obtained in step S30 and the stabilization starting from step S35 are performed. It is determined whether or not the total value with the time c1 is less than the closing completion time setting value Ts read in step S10. If the closing completion time T is less than the closing completion time set value Ts (Yes in step S70), the current closing completion time T becomes the shortest closing completion time, and the process proceeds to the next step S75.

  In step S75, the current closing completion time T (which is the shortest closing completion time) is stored in the RAM 55 as the closing completion time setting value Ts, and the current valve setting value Bs is stored again. Then, for the next control, a command to increase the valve set value Bs by one step in the direction in which the flow rate increases (a step amount for each step is set in advance) is output to the air valve 43. The air valve 43 sets a valve set value that increases the flow rate by one stage based on a command from the CPU 53. Then, this flow ends.

  On the other hand, if the closing completion time T is not less than the closing completion time set value Ts in step S70 (No in step S70), the closing completion time set value Ts is the shortest closing completion time, so the next step The process moves to S80.

  In step S80, the current valve set value Bs is regarded as the optimum value and stored again in the RAM 55. Then, the current valve set value Bs is set as a set value for the next control again, and this flow is finished.

  In the above, the procedure of step S20, step S25, and step S30 constitutes the closing time measuring means described in each claim, and the procedure of step S35, step S40, and step S45 constitutes the stabilization time measuring means. . Moreover, the procedure of step S40 and step S45 also comprises a determination means. And the procedure of step S20, step S25, step S30, step S35, step S40, step S45, step S50, step S55, step S60, step S65, and step S70 including these constitutes a time measuring means. The procedure of step S80 constitutes a driving force determination unit.

  As described above, the door device 27 of the machine tool according to the present embodiment sequentially changes the driving force value of the air cylinder 40 that generates the driving force, and measures the closing completion time T corresponding to each driving force value. Based on the closing completion time T measured corresponding to each driving force value, the optimum driving force value of the air cylinder 40 can be determined so that the closing completion time T is the shortest. As a result, the time required for the door closing operation can be shortened, and the non-working time of the machine tool 21 can be shortened. Accordingly, since the operator does not increase the driving force carelessly, it is possible to prevent the durability of the door device 27 from being lowered due to the bounce when the door 28 reaches the closed position.

  In the present embodiment, in particular, after determining the optimum driving force value (see step S80), the air valve 43 automatically controls the air cylinder 40 so that the driving force becomes the optimum value. Accordingly, the time required for the door closing operation can be automatically minimized even if the operator does not perform a special operation (as in a modified example described later).

  The present invention is not limited to the above, and various modifications can be made without departing from the spirit and technical idea of the present invention.

  FIG. 8 is an explanatory diagram showing a modified example in which the operator manually operates so as to realize the optimum value after determining the optimum value of the driving force. In this modification, the operator 82 controls the driving force of the air cylinder 40 by the air valve 43 to an optimum value by operating the operation panel 56 while viewing the operation information displayed on the display device 62. Hereinafter, the control according to this modification will be described with reference to the flowchart shown in FIG. The same steps as those in the above embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified.

  In the flowchart of FIG. 9, steps S10 to S70 are the same as the flowchart of the embodiment shown in FIG. In step S70, when the closing completion time T (= t1 + c1; the total value of the closing time t1 and the stabilization time c1) falls below the closing completion time set value Ts (Yes in step S70), the newly set step S77 is executed. Move.

  In step S77, the current closing completion time T, which is the shortest value, is stored in the RAM 55 as the closing completion time setting value Ts, and the current valve setting value Bs is stored again. For the next control, a display signal for instructing the valve set value Bs to increase by one step in the direction in which the flow rate increases is output to the display device 62.

  Thereafter, in step S79, it is determined whether or not a setting input for the valve set value Bs has been made. When the operator 82 operates the operation panel 56 by looking at the operation information displayed on the display device 62 in step S77 (Yes in step S79), based on the command of the CPU 53 based on the valve set value input from the operation panel 56, The valve set value is set so that the air valve 43 increases the flow rate by one stage. Thereafter, this flow is terminated.

On the other hand, when the closing completion time T is not less than the closing completion time set value Ts in step S70 described above (No in step S70), the closing completion time set value Ts is the shortest closing completion time. The process moves to step S87.

  In step S87, the current valve set value Bs is regarded as an optimum value and stored again in the RAM 55. Then, the display device 62 outputs a display signal for setting the current valve set value Bs to the set value for the next control again.

  Thereafter, in step S89, it is determined whether or not a setting input for the valve setting value Bs has been made. When the operator 82 operates the operation panel 56 by looking at the operation information displayed on the display device 62 in step S87 (Yes in step S89), based on the command of the CPU 53 based on the valve set value input from the operation panel 56, A current valve set value Bs that maintains the flow rate of the air bubble 43 is set. Thereafter, this flow is terminated.

  As described above, when the optimal value of the driving force of the air cylinder 40 is set, the door device 27 of the present modification displays operation information for the display device 62 to realize the optimal value. The operator 62 who sees the display operates according to the operation information, so that the air valve 43 can control the driving force of the air cylinder 40 to the optimum value. As a result, it is possible to reliably shorten the time required for the door closing operation by the operator's own operation while confirming the intention of the operator 82.

It is a side view which shows the machine tool provided with one Embodiment of the door apparatus of this invention. It is a sectional side view of the upper part of a door apparatus. It is a front view which notches and shows a part of door apparatus when a door is an open state. It is a front view which notches and shows a part of door apparatus when a door is a closed state. It is a block diagram which shows the apparatus structure of the control apparatus installed in the machine tool. It is explanatory drawing which shows the principle of the door closing control of a door apparatus. It is a flowchart which shows the control procedure performed with a control apparatus. It is a front view which partially cuts and shows the door apparatus in a modification. It is a flowchart which shows the control procedure performed with a control apparatus.

Explanation of symbols

1 Machine tool 23 Splash guard (cover)
26 Opening 27 Door device 28 Door 40 Air cylinder 43 Air valve 46 Limit switch 44 Pressure source 50 Control device 53 CPU
56 Operation panel 62 Display device

Claims (9)

In the machine tool door device for opening and closing the opening provided in the cover covering the periphery of the machine tool,
A door movably provided between an open position for opening the opening and a closed position for closing the opening;
Driving means for generating a driving force for moving the door from the open position to the closed position;
Time-measurement processing means for measuring a closing completion time until the door is moved from the open position to the closed position by the driving force of the drive means and is stabilized at the closed position;
Driving force determining means for determining an optimum value of the driving force value based on the closing completion time measured by the timing processing means corresponding to each driving force value while sequentially changing the driving force value by the driving means; A door device for a machine tool characterized by comprising: The door device for a machine tool according to claim 1,
Drive control means for controlling the drive means is provided,
The time measuring means measures the closing completion time at each driving force value when the driving control means sequentially changes the driving force of the driving means to a plurality of driving force values,
A storage means for storing a plurality of closing completion times measured by the time measuring means corresponding to each of the plurality of driving force values is provided,
The driving force determining means determines, as the optimum value, the driving force value that gives the shortest closing completion time among the plurality of closing completion times stored in the storage means. Door device. The door device for a machine tool according to claim 2,
After the driving force determining means determines the optimum value, the drive control means controls the driving means so that the driving force becomes the optimum value. The door device for a machine tool according to claim 2,
Operating means capable of operating the driving force of the driving means via the driving control means;
After the driving force determining means determines the optimum value, the driving control means has display means capable of displaying operation information of the operating means for setting the driving force of the driving means to the optimum value. A machine tool door device. In the door device of the machine tool according to any one of claims 1 to 4,
Closing detection means for detecting that the door is in the closed position;
The timekeeping processing means is
The door device for a machine tool, wherein the closing completion time is measured based on a detection result of the closing detection means. The door device for a machine tool according to claim 5,
The closure detecting means includes
A door device for a machine tool, which is a limit switch for detecting a mechanical contact state of the door. In the door device of the machine tool according to claim 5 or 6,
The timekeeping processing means is
A closing time measuring means for measuring the closing time until the closing detecting means first detects the closing position of the door after the drive control means inputs a movement command signal for moving the door to the closing position. A machine tool door device. The door device for a machine tool according to claim 7,
The timekeeping processing means is
After the closing time measuring means measures the closing time, it comprises determination means for determining whether or not the time during which the closing detection means detects the closing position of the door has reached a predetermined threshold value. A machine tool door device. The door device for a machine tool according to claim 8,
The timekeeping processing means is
A door device for a machine tool, comprising: stabilization time measuring means for measuring a stabilization time until the determination of the determination means is satisfied after the closing time measuring means has measured the closing time.

Images