JP4233944B2 - Mold fall prevention device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mold drop prevention device that improves the efficiency of mold mounting work and simplifies the structure of the mold by notifying the operator of the clamped / unclamped state of the mold.
[0002]
[Prior art]
Conventionally, when a mold is mounted on the upper and lower tables of a bending apparatus such as a press brake, a fall-preventing claw 50 is used, for example, as shown in FIG. 11 to prevent the mold from dropping. Yes.
[0003]
The fall-preventing claw 50 is attached to the mold P side via a spring 51. When the claw 50 is mounted, the mold 50 is immersed in the mold P against the restoring force of the spring 51. When P is inserted into the mold holder 52, the claw 50 protrudes by the restoring force of the spring 51 and engages with the recess 53.
[0004]
A specific example of such a fall prevention claw is disclosed in, for example, Japanese Patent No. 27771063 (safety members 24 and 34 shown in FIG. 2 of the same patent publication).
[0005]
[Problems to be solved by the invention]
However, conventionally, the drop preventing claw 50 (FIG. 11) is engaged with the recess 53 on the mold holder 52 side, that is, the mold P is in a clamped state with the mold holder 52. There is no means for confirming whether it is in an unclamped state.
[0006]
Accordingly, even if the mold P is intended to be mounted on the mold holder 52, the mold P is not actually engaged with the recess 53, so that when the operator releases the hand from the mold P, the mold P May fall.
[0007]
As a result, since the operator does not know the clamping state or the unclamping state of the mold with respect to the mold holder, the setup time before processing becomes long, for example, the mold must be mounted many times. As a result, the work efficiency becomes extremely low, and as a result, the processing efficiency of the entire press brake decreases.
[0008]
Furthermore, as disclosed in the above-mentioned Japanese Patent No. 2777103, the structure of the nail 50 (the safety members 24 and 34 as described above in the patent publication) is complicated, and the cost of the mold P is accordingly increased. Is high.
[0009]
An object of the present invention is to improve the efficiency of mold mounting work and to simplify the structure of the mold by notifying the operator of the clamped / unclamped state of the mold.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, according to the present invention,
In a bending apparatus for bending a workpiece W with a punch P attached to the upper table 20 via the punch holder 19 and a die D attached to the lower table 21 via the die holder 22,
The tool holders 19 and 22 consisting of the punch holder 19 and die holder 22, provided pivotably the clamping plate member 1, 1 'in the opening 8, 8' to form the openings 8, 8 ', the The molds P and D including the punch P and the die D are fixed with the fall-preventing claws 5 and 5 'that can be engaged with the fastening plate members 1 and 1, and cooperate with the fastening plate members 1 and 1. Clamp / unclamp detection means LS1 and LS2 for detecting the clamp state or unclamp state between the fixed claws 5 and 5 of the molds P and D and the mold holders 19 and 22 are provided to detect the clamp / unclamp. A technical means called a mold drop prevention device is provided, which is provided with display portions 33A and 33B for displaying the clamped state or the unclamped state detected through the means LS1 and LS2 .
[0011]
Therefore, according to the configuration of the present invention, for example, the fastening plate members 1, 1 ′ can be pivoted (FIG. 1), and the inner side of the pressing portions 4, 4 ′ of the fastening plate members 1, 1 ′ If the limit switches LS1 and LS2 constituting the clamp / unclamp detection means LS1 and LS2 are provided in the vicinity of the inside of the pressing portions 4 and 4 ′, the operator temporarily presses them. In a state in which the pressing members 4 and 4 'are pressed to rotate the fastening plate members 1 and 1' outward against the restoring force of the springs 3 and 3 ', and the lower part of the punch holder 19 and the upper part of the die holder 22 are opened. After the molds P and D are inserted, if the operator releases his hands from the pressing portions 4 and 4 ', the fastening plate members 1 and 1' are turned inward by the restoring force of the springs 3 and 3 ', and the punch holder 19 , The upper portion of the die holder 22 is closed, so that the engaging portions of the fastening plate members 1, 1 ′ , 6 'and the fixing claws 5, 5' of the molds P, D are engaged to be in a clamped state, and at the same time, the pressing portions 4, 4 'of the fastening plate members 1, 1' are brought into contact with the limit switches LS1, LS2. Therefore, the limit switches LS1 and LS2 output ON signals S1 and S2, for example, the corresponding display lamps 33AC and 33BC on the screen of the display unit 33 are lit (FIG. 8B), and the operator FIG. 11 shows the clamped / unclamped state of the mold, and the engaging members on the molds P and D side are different from the conventional retractable claw 50 (FIG. 11), and the fixed claw 5 is fixed. 5 ′ (FIGS. 3 and 6).
[0012]
Therefore, according to the present invention, it is possible to improve the efficiency of the mold mounting work and simplify the structure of the mold by notifying the operator of the clamped / unclamped state of the mold.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described with reference to the accompanying drawings by embodiments.
FIG. 1 is an overall view of an embodiment of the present invention.
[0014]
The bending apparatus shown in FIG. 1 is, for example, a descending press brake to which the mold fall prevention apparatus according to the present invention is applied, and an upper table 20 disposed above and below side plates 29 on both sides (X-axis direction). A lower table 21 is provided, and a punch P is mounted on the upper table 20 via a punch holder 19, and a die D is mounted on the lower table 21 via a die holder 22.
[0015]
Further, an abutment 23 constituting a back gauge is disposed behind the lower table 21, and at the time of machining, the workpiece W is abutted against the abutment 23 and positioned, and then the punch P and the die D cooperate with each other to determine a predetermined value. The bending process is performed.
[0016]
In this case, the punch P and the die D are formed with V-grooves (not shown) as usual, and locking members (not shown) projecting into the respective V-grooves by a cylinder (not shown) on the punch holder 19 and the die holder 22 side. ) Are fixed, the punch P and the die D are fixed, and the punch P and the die D are prevented from falling by the die drop prevention device according to the present invention described in detail below.
[0017]
That is, an opening 8 whose lower side is opened is formed on the front surface of the punch holder 19 (FIG. 2), and the fastening plate member 1 is provided in the opening 8 so as to be pivotable via the pivot shaft 2. Yes.
[0018]
The fastening plate member 1 has a rectangular parallelepiped shape as a whole, the upper portion is provided with a pressing portion 4, and an engagement portion with which a fixing claw 5 of a punch P to be described later engages (see FIG. 3) on the lower inner surface. 6 is provided (FIG. 2).
[0019]
Further, the inner side of the pressing portion 4 of the fastening plate member 1 (FIG. 1) is urged by the spring 3, and a clamp / unclamp detection means, for example, a limit switch LS1 is provided in the vicinity of the inner side of the pressing portion 4.
[0020]
On the other hand, a claw 5 as shown in the figure is fixed to the handle (FIG. 3) of the punch P, that is, the shank portion, and the fixed claw 5 is engaged with the engaging portion 6 (FIG. 1) of the fastening plate member 1. It is possible.
[0021]
With this configuration, when the operator presses the pressing portion 4 of the fastening plate member 1 (FIG. 2), the fastening plate member 1 (FIG. 1) turns outward against the restoring force of the spring 3 to punch The lower part of the holder 19 is opened.
[0022]
Accordingly, when the punch P is inserted from the opened lower side of the punch holder 19 and the operator releases his / her hand from the pressing portion 4, the fastening plate member 1 is turned inward by the restoring force of the spring 3. The fixing claw 5 of P engages with the engaging portion 6 of the fastening plate member 1, and the punch P and the punch holder 19 are in a clamped state.
[0023]
At this time, the inner side of the pressing portion 4 of the fastening plate member 1 contacts the limit switch LS1, so that the push button of the limit switch LS1 is pressed, and an ON signal S1 is output from the limit switch LS1. The on signal S <b> 1 is input to the NC device 30.
[0024]
Thereby, the NC device 30 turns on the corresponding display lamp on the screen of the display unit 33, that is, the display lamp 33AC (for example, FIG. 8A) indicating the clamped state of the punch P.
[0025]
On the contrary, when the punch P and the punch holder 19 are in the unclamped state and the on signal S1 is not output from the limit switch LS1, the NC device 30 displays the display unit for the sake of clarity. The corresponding display lamp on the screen 33, that is, the display lamp 33AU indicating the unclamped state of the punch P is turned on.
[0026]
Thus, according to the present invention, the operator can be informed of the clamped / unclamped state of the punch P with respect to the punch holder 19, so that the operator can quickly and quickly mount the punch P while looking at the screen (FIG. 8). Therefore, the setup time before processing can be shortened, and the efficiency of the work for attaching the punch P can be improved.
[0027]
The number of the fastening plate members 1 provided on the punch holder 19 side (FIG. 4) and the number of the fixed claws 5 provided on the punch P side are not necessarily the same. When the number of the members 1 is three, the number of the fixing claws 5 is small as in the case of two fixing claws 5, but if both are in a clamped state, the fall of the punch P can be sufficiently prevented.
[0028]
In addition, as shown in FIG. 4, when the fastening plate members 1 are provided at equal intervals, for example, every distance a, the interval between the fixed claws 5 is a × 2 (generally an integer multiple of a).
[0029]
On the other hand, an opening 8 'whose upper side is opened is formed on the front surface of the die holder 22 (FIG. 5), and a fastening plate member 1' can turn freely through the turning shaft 2 'in the opening 8'. Is provided.
[0030]
The fastening plate member 1 ′ has a rectangular parallelepiped shape as a whole, a pressing portion 4 ′ is provided at the lower portion, and a fixing claw 5 ′ of a die D (to be described later) is engaged with the lower surface inside the upper portion (FIG. 6). An engaging portion 6 'is provided (FIG. 5).
[0031]
Further, the inner side of the pressing part 4 'of the fastening plate member 1' (FIG. 1) is urged by a spring 3 ', and a clamp / unclamp detecting means, for example, a limit switch LS2 is provided in the vicinity of the inner side of the pressing part 4'. It has been.
[0032]
Further, a claw 5 'as shown in the figure is fixed to the handle (ie, shank) of the die D (FIG. 6), and the fixed claw 5' is engaged with the engaging portion 6 '(FIG. 1) of the fastening plate member 1'. ) Can be engaged.
[0033]
With this configuration, when the operator presses the pressing portion 4 ′ of the fastening plate member 1 ′ (FIG. 5), the fastening plate member 1 ′ (FIG. 1) is moved outward against the restoring force of the spring 3 ′. It turns and the upper part of the die holder 22 is opened.
[0034]
Accordingly, when the die D is inserted from above the opened die holder 22 and the operator releases his / her hand from the pressing portion 4 ′, the fastening plate member 1 ′ is turned inward by the restoring force of the spring 3 ′. The fixing claw 5 ′ of the die D engages with the engaging portion 6 ′ of the fastening plate member 1 ′, and the die D and the die holder 22 are in a clamped state.
[0035]
At this time, the inner side of the pressing portion 4 ′ of the fastening plate member 1 ′ comes into contact with the limit switch LS 2, whereby the push button of the limit switch LS 2 is pressed, and an ON signal S 2 is output from the limit switch LS 2. The ON signal S2 is input to the NC device 30.
[0036]
Thereby, the NC device 30 turns on the corresponding display lamp on the screen of the display unit 33, that is, the display lamp 33BC (for example, FIG. 8B) indicating the clamping state of the die D.
[0037]
Contrary to the above, when the die D and the die holder 22 are in an unclamped state and the on signal S2 is not output from the limit switch LS2, the NC device 30 also displays its display unit for the sake of clarity. The corresponding display lamp on the screen 33, that is, the display lamp 33BU indicating the unclamped state of the die D is turned on (for example, FIG. 8A).
[0038]
Thus, according to the present invention, the operator can be informed of the clamped / unclamped state of the die D with respect to the die holder 22, so that the operator can quickly and reliably perform the mounting operation of the die D while looking at the screen (FIG. 8). Therefore, the setup time before processing is shortened, and the efficiency of the die D mounting work can be improved.
[0039]
The number of fastening plate members 1 'provided on the die holder 22 side (FIG. 7) and the number of fixing claws 5' provided on the die D side are not necessarily the same. When there are three plate members 1 ′, the number of the fixed claws 5 ′ is small, such as two fixed claws 5 ′, but if both are in a clamped state, the die D can be sufficiently prevented from falling. .
[0040]
Further, as shown in FIG. 7, when the fastening plate members 1 'are provided at equal intervals, for example, every distance b, the interval between the fixing claws 5' is b × 2 (generally an integer multiple of b).
[0041]
The operation of the present invention having the above configuration will be described below with reference to FIGS.
[0042]
(1) Operations until the NC device 30 determines whether or not the ON signals S1 and S2 from the limit switches LS1 and LS2 are received (step 101 to step 103 in FIG. 9).
[0043]
In step 101 of FIG. 9, it is determined whether or not the start switch 31 has been pressed. If the start switch 31 has been pressed (YES), the timer 32 is reset in step 102, and the worker mounts the mold in this state. In step 103, it is determined whether or not the ON signal is received within a certain time.
[0044]
That is, when the operator attaches the molds P and D to the mold holders 19 and 22, assuming that the start switch 31 is pressed in advance (FIG. 1), the NC device 30 firstly starts the start switch 31. It is determined whether or not the button is pressed. If the button is pressed, the timer 32 is then reset, and for example, the set time is set to T (FIG. 10A).
[0045]
In this case, two timers 32 (FIG. 1) are provided, one timer 32A is used for punch P and the other timer 32B is used for die D. Initially, when the start switch 31 is pressed, the NC that detects that The apparatus 30 transmits reset signals S3 and S4 to the two timers 32A and 32B at the same time, for example, at t1 (FIG. 10A).
[0046]
As a result, the timers 32A and 32B are simultaneously reset, and the first measurement of the predetermined time T is started.
[0047]
Further, the operator presses the pressing portions 4 and 4 'of the fastening plate members 1 and 1' (FIG. 1), and the fastening plate members 1 and 1 'are opposed to the restoring force of the springs 3 and 3'. The punch P and the die D are inserted after the lower part of the punch holder 19 and the upper part of the die holder 22 are opened, and then the fastening plate members 1 and 1 'are turned inward by the restoring force of the springs 3 and 3'. The molds P and D are mounted on the mold holders 19 and 22 by closing the punch holder 19 and the die holder 22 above.
[0048]
(2) Operation when an ON signal is received within a certain time (YES in step 103 in FIG. 9).
[0049]
If the ON signal is received within a predetermined time in step 103 in FIG. 9, it is displayed in step 104 that the mold is in a clamped state.
[0050]
For example, when the NC device 30 receives the ON signal S1 from the limit switch LS1 within the predetermined time T set in the first time (t2 in FIG. 10B), the punch P is moved to the punch holder 19. Is considered to be in a clamped state.
[0051]
Accordingly, the NC device 30 transmits a clamp signal S5 indicating that the punch P is in a clamped state to the punch P display unit 33A constituting the display unit 33 (FIG. 1) (t2 in FIG. 10C). .
[0052]
Thereby, the display unit 33A for the punch P of the display unit 33 (FIG. 8A) turns on the display lamp 33AC indicating the clamped state of the punch P.
[0053]
The operator who has seen this can confirm that the punch P is in a clamped state with respect to the punch holder 19.
[0054]
(3) Operation when no ON signal is received within a certain time (NO in step 103 in FIG. 9).
[0055]
In step 103 of FIG. 9, when the ON signal is not received within a predetermined time, it is displayed in step 105 that the mold is in an unclamped state, and the process returns to step 102 to reset the timer 32 and this state. Then, the worker wears the mold (in parentheses), and in step 103, it is determined whether or not the ON signal is received within a certain time.
[0056]
For example, the NC device 30 did not receive the ON signal S2 from the limit switch LS2 for the die D within the predetermined time T set in the first time (t1 to t3 in FIG. 10B). (T2 in FIG. 10B).
[0057]
Therefore, the NC device 30 transmits an unclamp signal S8 indicating that the die D is in an unclamped state to the die D display unit 33B of the display unit 33 at the time t3 when the predetermined time T elapses. (T3 in FIG. 10C).
[0058]
Thereby, the display unit 33B for the die D of the display unit 33 (FIG. 8A) turns on the display lamp 33BU indicating the unclamped state of the die D.
[0059]
An operator who has seen this can confirm that the die D is in an unclamped state with respect to the die holder 22.
[0060]
Then, the NC device 30 (FIG. 1) transmits an unclamp signal S8 to the die D display unit 33B of the display unit 33, and simultaneously transmits a reset signal S4 to the die D timer 32B (FIG. 10A). ) T3), the timer 32A is reset again and measurement of the second fixed time T is started. At this time, the operator reattaches the die D (in parentheses).
[0061]
Thereafter, when the NC device 30 receives the ON signal S2 from the limit switch LS2 for the die D, for example, at t4 within the predetermined time T set in the second time (FIG. 10 (B)), D is considered to be in a clamped state with respect to the die holder 22.
[0062]
Accordingly, the NC device 30 transmits a clamp signal S7 indicating that the die D is in the clamped state to the die D display unit 33B of the display unit 33 (t4 in FIG. 10C).
[0063]
Accordingly, the die D 33B of the display unit 33 (FIG. 8B) turns on the display lamp 33BC indicating the clamp state of the die D.
[0064]
An operator who has seen this can confirm that the die D is clamped with respect to the die holder 22.
[0065]
That is, as shown in FIG. 8B, the operator can confirm that the punch P and the die D are both clamped with respect to the punch holder 19 and the die holder 22, and thereafter perform a predetermined operation. The hydraulic cylinder (not shown) is actuated by lowering the punch P (FIG. 1) by performing a machining operation such as depressing the foot pedal from the side, and the workpiece W is subjected to a predetermined bending process in cooperation with the die D. Can do.
[0066]
【The invention's effect】
According to the present invention, the following effects can be obtained.
(1) That is, as shown in FIG. 8, the operator can be notified of the clamping / unclamping state of the mold, so that the operator cannot confirm the clamping / unclamping state of the mold as in the prior art. Even if you intend to attach the mold, it will be dropped, the setup time before processing will be long and work efficiency will not be reduced, and the mold will be displayed while looking at the state of the mold displayed on the screen (Fig. 8). The mold mounting operation can be performed quickly and reliably, so that the efficiency of the mold mounting operation by the operator can be improved.
[0067]
(2) Further, the claw on the punch P side (FIG. 3) and the die D side (FIG. 6) are fixed claws 5 and 5 ', so that it can be compared with a complicated structure that can be moved in and out as in the prior art (FIG. 11, Japanese Patent No. 2771063), it is possible to simplify the structure of the mold.
[0068]
[Brief description of the drawings]
FIG. 1 is an overall view showing an embodiment of the present invention.
FIG. 2 is a view showing a fastening plate member 1 on the side of a punch holder 19 according to the present invention.
FIG. 3 is a view showing a fixing claw 5 on the punch P side according to the present invention.
FIG. 4 is a view showing a relationship between a clamping plate member 1 on the punch holder 19 side and a fixing claw 5 on a punch P constituting the present invention.
FIG. 5 is a view showing a fastening plate member 1 ′ on the die holder 22 side according to the present invention.
FIG. 6 is a view showing a fixing claw 5 ′ on the die D side according to the present invention.
FIG. 7 is a view showing a relationship between a fastening plate member 1 ′ on the die holder 22 side and a fixing claw 5 ′ on the die D side constituting the present invention.
FIG. 8 is a display example showing a clamped state and an unclamped state of the mold holders 19 and 22 of the molds P and D according to the present invention.
FIG. 9 is a flowchart for explaining the operation of the present invention.
FIG. 10 is a time chart for explaining the operation of the present invention.
FIG. 11 is an explanatory diagram of a conventional technique.
[Explanation of symbols]
1, 1 'fastening plate member 2, 2' swivel shaft 3, 3 'spring 4, 4' pressing part 5, 5 'fixing claw 6, 6' engaging part 8, 8 'opening 19 punch holder 20 upper table 21 Lower table 22 Die holder 23 Abutting 29 Side plate 30 NC device 31 Start switch 32 Timer 32A Punch P timer 32B Die D timer 33 Display unit 33A Punch P display unit 33A
33B Die D Display Unit 33B
D Die P Punch W Workpiece

Claims (3)

In a bending apparatus for bending a workpiece by a punch mounted on an upper table via a punch holder and a die mounted on a lower table via a die holder,
The mold holder consisting of the punch holder and the die holder is formed with an opening and a fastening plate member is pivotably provided in the opening , and the die consisting of the punch and die is engaged with the clamping plate member. Clamp and unclamp detection means for detecting a clamp state of the fixed claw of the mold and the mold holder or detecting an unclamp state in cooperation with the fastening plate member is provided to fix the possible fall prevention claw, A mold drop prevention device comprising a display unit for displaying the clamped state or the unclamped state detected through the clamp / unclamp detection means . The fastening plate member is formed with a pressing portion protruding outward and an engaging portion protruding inward, the inside of the pressing portion is spring-biased, and the clamp / unclamp detection means is located near the inside of the pressing portion. The mold drop prevention device according to claim 1, further comprising: a limit switch that configures the display unit, and a screen that configures the display unit. After inserting the fixed claw side of the mold from the engagement part side opened by pressing the pressing part of the fastening plate member and releasing the hand from the pressing part, the limit switch contacts the fastening plate member and is constant When the ON signal is output within the time, the corresponding clamp state display part on the screen is turned on, and the limit switch does not contact the fastening plate member and does not output the ON signal within a certain time. 3. The mold drop prevention device according to claim 2 , wherein the corresponding unclamped state display portion on the screen is lit.

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