JPH11207416A - Punch press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect strip miss without imposing a burden on a machine and by simple constitution. SOLUTION: On a striking means 29 for striking punching tools 7, an operating member 47 which is always downwards energized is provided. The operating member 47 is upwards moved by abutting the striking means 29 on the upper part of a punching tool 7. A detecting means 56 for detecting the appearance state of this operating member 47, monitoring means 58 for monitoring the elevated and lowered position of the striking means 29 are provided. A judging means 59 for judging the abnormality of the machine such as strip miss based on the elevated and lowered positions of the striking means 29 and detected result of the detecting means 56 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punch press having a function of detecting a mechanical error such as a strip error of a punch tool.

[0002]

2. Description of the Related Art In a punch press, even when a punch tool descends and punches a plate material and then attempts to rise to a predetermined standby height, the phenomenon that the punch tool does not rise because the plate material does not come off from the punch tool sometimes occurs. Get up as. Such a phenomenon is called a strip mistake. Conventionally, an electric circuit is formed between a striker that strikes a punch tool and a punch tool to detect the strip mistake, so that the circuit closes when the striker and the punch tool are in contact and opens when the striker and the punch tool are not in contact. Is known.

[0003]

However, when an electric circuit is formed in a machine in this way, an electric current flows in the machine, which is not preferable from the viewpoint of the machine. In addition, a configuration such as providing an insulating member for electrically separating the portion from which a current cannot flow is required, which complicates the configuration.

An object of the present invention is to provide a punch press which can solve such a problem and can reliably detect a mechanical error such as a strip error with a simple configuration not depending on an electric circuit.

[0005]

The structure of the present invention will be described with reference to FIG. 3 corresponding to an embodiment. The punch press includes a punch tool (7) for processing a plate material (W), a hitting means (29) for hitting the punch tool (7), and a punching means (29) provided on the hitting means (29). Energized,
An operating member (47) which moves upward when the beating means (29) comes into contact with the upper part of the punch tool (7), and a detecting means (56) for detecting a state of the operating member (47).
A monitoring means (58) for monitoring an ascending / descending position of the beating means (29); and a judging means for judging a machine abnormality based on the ascending / descending position of the beating means (29) and the detection result of the detecting means (56). 59) and (59). According to this configuration, in the repetitive process of punching the plate material (W) by hitting the punch tool (7) by lifting and lowering of the hitting means (29),
The state of the operating member (47) is detected by the detecting means (56). The operating member (47) moves upward when the beating means (29) comes into contact with the upper part of the punch tool (7), and the upwardly-returned state of the beating means (29) eliminates the state of being pushed up by the punch tool (7). And return to descend. Therefore, when there is a predetermined mechanical abnormality, a deviation occurs in the relationship between the vertical position of the hitting means (29) and the operating member (47). For example, when the punching tool (7) does not properly return to the rising state even when the hitting means (29) returns to the rising state,
The return of the operating member (47) at a proper timing is not performed, and the vertical position of the hitting means (29) and the operating member (47) are not changed.
Shifts in the relationship with. The above-described poor return of the punch tool (7) occurs when a strip error or the like occurs. Such a shift is caused by the operation member (4) by the detection means (56).
The determination result is determined by the determination means (59) based on the detection result of 7) and the ascending / descending position of the beating means (29) obtained by the monitoring means (58), and the determination of the mechanical abnormality is performed. In this case, the presence or absence of a mechanical abnormality is determined without forming an electric circuit between the hitting means (29) and the punch tool (7).
It is not necessary to secure current between the hitting means (29) and the punch tool (7). If it is configured to be in contact with the upper surface of the tool (7), an abnormality determination can be made. For example, even when an electrically insulating packing for air blowing protrudes from the upper surface of the punch tool (7), abnormality determination can be performed without any problem. Further, it is not necessary to perform an electrical insulation process, and therefore, it is possible to reliably detect a mechanical abnormality with a simple configuration.

In the above structure, the operating member (47)
Is preferably provided at a portion of the punching means (29) which comes into contact with the hit portion of the punch tool (7). In particular, it is preferable that the operating member (47) is provided partially below the beating means (29) independently of a portion for beating the punch tool (7). In the case of this configuration, even if the operating member (47) hits the punching tool (7) as the punching means (29) moves up and down, no punch load is applied.
It has a simple structure and can have a long life. Further, in the above configuration, the abnormality determining means (59) determines a strip mistake when the hitting means (29) detects that the contact is not made by the detecting means (56) when the hitting means (29) returns to the up position. It may be a strip error determination unit that performs the operation. In the case of this configuration, the strip error is determined as follows. In the process of repeating the punching operation by raising and lowering the hitting means (29), if the stripping is performed properly, the punch tool (7) moves up and returns to a predetermined ascending return height together with the hitting means (29). Means (2
9). If a strip mistake has occurred, the work (W) bitten by the punch tool (7)
The punch tool (7) cannot be lifted due to the weight or the like.
On the other hand, the beating means (29) attempts to ascend from the bottom dead center even in this state.
9) leaves. Therefore, when the hitting means (29) detects the absence of contact by the detecting means (56) at the time of returning to the ascending state, it means that a strip error has occurred, and this strip error is an abnormality determining means ( 59). In each of the above configurations, the detecting means (5
6) is a fluid pressure sensor, and the fluid path leading to the fluid pressure sensor is in a communication state and a cutoff state in the operating member (47).
It is good also as what changes according to a haunting state.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. The punch press includes upper and lower turrets 2 and 3 on a frame 1, a punch driving mechanism 4, and a work feeding mechanism 5. The frame 1 has a C-shaped side surface, and upper and lower turrets 2 and 3 serving as tool holders are arranged in the throat thereof.
Are rotatably supported on upper and lower portions of the frame 1 so as to be rotatable about a vertical axis concentric with each other.

The upper turret 2 has a plurality of punch holding holes 6.
(FIG. 2) are provided in a plurality of rows by being arranged on a concentric circle centered on the turret axis O. The punch holding holes 6 in the inner circumferential row and the punch holding holes 6 in the outer circumferential row are the same as the turret 2. It is arranged at an angular position. A punch tool 7 is installed in each of the punch holding holes 6 so as to be able to move up and down. The lower turret 3 has a die tool 8 corresponding to each punch tool 7 of the upper turret 2 installed on the upper surface. These upper and lower turrets 2, 3
Have sprockets 9 and 10 on their shafts, and are rotated by a common motor 11 installed on the frame 1 in synchronization with each other via a drive transmission system (not shown) such as a chain. The motor 11 and the drive transmission system constitute tool indexing means 13 for indexing a desired punch tool 7 to a ram position P which is the center of the ram 12. Further, positioning holes 14a corresponding to the respective punch holding holes 6 are provided on the outer diameter surfaces of the upper and lower turrets 2 and 3, and an index pin (not shown) is engaged with the positioning holes 14a so that the turret is engaged. A pair of indexing position holding mechanisms 14 for holding a few angles and improving the accuracy of the indexing angle are provided at the rear of the frame 1. Indexing position holding mechanism 14
Comprises a cylinder device for moving the index pin forward and backward.

The punch driving mechanism 4 includes a ram 12 for hitting the punch tool 7 and a punch driving source 15 for moving the ram 12 up and down. The punch driving mechanism 4 may be a mechanical type or a hydraulic type. In this example, the punch driving mechanism 4 is a hydraulic type, and a hydraulic cylinder is used as the punch driving source 15. The ram 12 is provided with a beating position selecting means 16 for selecting and punching the punch tools 7 in the inner and outer rows of the turret 2. The configuration of the beating position selecting means 16 will be described later. The work feeding mechanism 5 is a means for sending an arbitrary portion of the work W made of a plate material placed on the table 17 to the ram position P. The work feed mechanism 5 is moved forward and backward (Y
Direction), a cross slide 19 is installed on the carriage 18 that can move left and right (X direction), and a work holder 20 that holds an end of the work W is attached to the cross slide 19.

[0010] The table 17 is provided with a free bearing (not shown) on which the work W is placed. Also,
As shown in FIG. 3, a turret section table 21 is provided on the upper surface of the lower turret 3, and a die section table 23 is also provided on the die holder 22. The die holder 22 is installed on the lower turret 3 while holding the outer and inner rows of die tools 8 at each position. The lower turret 3 has a slag drop hole 24 at the installation position of each die tool 8.

As shown in FIG. 3, each punch tool 7 has a shearing blade 26 fitted in a cylindrical guide member 25 also serving as a stripper so as to be able to move up and down, and a first return spring 27 which is an elastic body. As a result, the shearing blade 2
6 is supported in a rising state. The shear blade body 26
An upper end protrudes above the guide member 25, and the first return spring 27 is provided between a flange-shaped spring receiver 26 a provided at the upper end thereof and a flange portion 25 a provided at the upper end of the guide member 25. Is provided. The entirety of the punch tool 7 is a second elastic body which is fitted to the punch holding hole 6 of the turret 2 at the outer periphery of the guide member 25 so as to be able to move up and down, and is interposed between the flange 25a and the upper surface of the turret 2. Is supported by the turret 2 in an ascending state by a return spring 28. The second return spring 28 includes the first return spring 2
When the punch tool 7 is pushed from above by the ram 12, the second return spring 2
8 is compressed, the entire punch tool 7 descends, and the work W is pressed by the lower surface of the guide member 25. Thereafter, the first return spring 27 is compressed, and the shearing blade body 26 descends with respect to the guide member 25, and punches a hole in the work W. Ram 1
When 2 reaches the bottom dead center and starts to rise, the shearing blade body 26 rises by the restoring force of the first return spring 27, and the shearing blade body 26 comes out of the punch hole of the work W. The entire punch die 7 is raised by the restoring force of the second return spring 28. Therefore, the guide member 25 and the first return spring 27 serve as a stripper when the shear blade 26 is pulled out from the punch hole.

As shown in FIG. 3, the ram 12 of the punch driving mechanism 4 is composed of a ram main body 12a and a striker 29 of the hitting position selecting means 16 provided on the lower surface thereof. The ram body 12a is provided with a ram guide 3 provided on the frame 1.
0 and is connected to a piston rod 15a of a punch drive source 15 composed of a hydraulic cylinder. The striking position selecting means 16 is such that a striker 29 as a striking means is installed in a striker guide 31 provided at the lower end of the ram main body 12a so as to be able to move laterally, and the striker 29 is advanced and retracted by a selecting cylinder 32 as a striker moving means. is there. The direction of the lateral movement of the striker 29 is
In this example, it is in the turret radial direction. The cylinder body of the selection cylinder 32 is attached to the striker guide 31 via a support member 33. Striker 2
9 is a guided body 34 guided by the striker guide 31 and a striker body 3 fixed to the lower end of the guided body 34 and directly hitting the upper surface of the punch tool 7.
5

The punch tool 7 has, at the center, a flow path 36 composed of a hole penetrating the shearing blade 26 vertically. The flow path 36 blows air supplied from an air supply source 37 from the lower end of the shearing blade body 26 to drop slag generated by punching from the inside of the die tool 8 to the slag drop hole 24 of the lower turret 3. It is. The air supply means 38 is formed at the center of the striker main body 35 in the ram 12 and has an outlet communicating with the flow path 36 of the punch tool 7 at the time of hitting, and an inlet of the flow path 39 and the air supply source 37. The air supply passage 40 connects the air supply passage and a valve 41 interposed in the air supply passage 40. A flexible pipe 40a is used for a portion of the air supply path 40 between the valve 41 and the striker 29.

The valve 41 has a rod-shaped fixed side member 42.
And a cylindrical movable-side member 43 fitted to the outer periphery thereof. The rod-shaped fixed-side member 42 is attached to the ram guide 30 via an attachment member 44 at the lower end. The cylindrical movable side member 43 is attached to the upper end of the ram 12 via the connecting member 45 at the upper end, and moves up and down integrally with the ram 12.

The striker body 35 in the ram 12
As shown in FIG. 4, there is provided an operating member 47 that is constantly urged downward by a spring 46 and moves upward when the striker body 35 contacts the upper part of the punch tool 7. The operating member 47 is a plate-shaped operating body 47a.
And an elevating guide portion 47b extending upward from the center of the upper end of the operation main body 47a, and the upper end of the elevating guide portion 47a is a valve body 47c. The installation position of the operating member 47 in the striker body 35 is as shown in FIGS.
As shown in the bottom view and the vertical cross-sectional view, the main body receiving groove formed at a predetermined distance from the center of the punch tool hitting portion where the slag blowing channel 39 is formed, and formed at that position. The operation main body 47a is arranged in the 48 so as to be able to protrude and retract from the lower end of the striker main body 35.

At the center of the upper surface of the operating body housing groove 48, a guide hole 49 for vertically moving the elevating guide portion 47b of the operating member 47 is formed partway upward. The guide hole 49 also serves as an air path for detection.
From the upper end of the guide hole 49, an air path 50 having a smaller diameter than the guide hole 49 forms the guided body 34 of the striker 29.
Is formed upward. A spring 46 for urging the operation member 47 downward is interposed in the guide hole 49 between the upper end of the elevating guide portion 47a of the operation member 47 and the upper end of the guide hole 49. This spring 46
Is set smaller than the first and second return springs 27 and 28 of the punch tool 7. A flange-shaped locking piece 47d is formed on both sides of the upper end of the operation main body 47a, and a ring-shaped stopper 51 for receiving the locking piece 47d is provided on a lower peripheral surface of the striker body 35. Thus, the amount of protrusion of the operation member 47 from the lower end of the striker body 35 is regulated so as to be a predetermined amount.

In the middle of the guide hole 49 in the striker body 35, the striker body 35 extends horizontally.
An exhaust path 52 that opens to the outer peripheral surface of the air passage is communicated. As shown in FIG. 4A, the position of the exhaust path 52 is such that the striker body 35 contacts the upper part of the punch tool 7 and the operating member 47 moves upward, as shown in FIG.
Closes the exhaust path 52, and in a state where the striker body 35 does not come into contact with the upper part of the punch tool 7 and the operating member 47 moves downward, as shown in FIG.
2 is set to open.

Further, as shown in FIG. 4A, the guided body 34 constituting the striker 29 has a lateral air supply passage 5 communicating with the air passage 50 of the striker body 35.
3 are formed along the lateral movement direction of the striker 29,
An air supply pipe 54 attached to a part of the striker guide 41 is inserted into the lateral air supply path 53. The air supply pipe 54 has an air outlet 54a near the tip.
have. Accordingly, the air path 50 of the striker body 35 is not restricted without restricting the lateral movement of the striker 29.
Is secured. Air supply pipe 5
4 is connected to an air supply source 55 as shown in FIG.
An air pressure sensor 56 is provided between the air supply source 55 and the air supply pipe 54 to detect the state of the operating member 47. Air pressure sensor 56
, A pressure switch or the like is used. This air pressure sensor 5
The air path 50 in the striker body 35 communicating with the valve body 47c is connected to the exhaust path 5
2 is switched between a communication state and a cutoff state. Thus, the air pressure sensor 56 can detect that the back pressure of the air supplied to the operating member 47 changes according to the state of the operating member 47 protruding and retracting. Note that the air pressure sensor 56 may be provided in the exhaust path 52.

As a control device for controlling the entire punch press, an NC device 57 is used.
Has a numerical control function unit and a programmable controller function unit. The NC device 57 is provided with a monitoring means 58 for monitoring the elevation position of the ram 12, and two judging means 59 and 59A for judging the presence or absence of a mechanical abnormality. The monitoring means 58 monitors the ram elevating position based on the detected value of the position detecting means for directly detecting the position of the ram 12, or the position detecting means provided in the punch driving source 15 of the punch driving mechanism 4. May be used to monitor the ram elevating position from the detected value of. Punch drive source 1
When a servo motor is used as 5, a pulse coder attached to the servo motor can be used as position detecting means. The first judging means 59 is means for judging the presence or absence of a machine abnormality under predetermined setting conditions from the ram elevating position obtained from the monitoring means 58 and the detection signal of the air pressure sensor 56. In this embodiment, when the air pressure sensor 56 detects that the operating member 47 has not come into contact with the punch tool 7 when the ram 12 returns to the up position, the determining means 59 determines that the strip is a mistake. It serves as a mistake determination means. The second judging means 59A serves as means for detecting an abnormality in the detecting function.
The air pressure sensor 56, which is a detecting means, detects that the punch tool 7 is in contact with the striker 29 when is located between a predetermined height corresponding to the return height of the punch tool 7 and the top dead center. Then, it is determined that the detection function has a failure.

The operation of the above configuration will be described. Punch tool 7 and die tool 8 installed on upper and lower turrets 2 and 3
The desired one is indexed to the ram position P by the rotation of the turrets 2 and 3. Whether the punch tool 7 in the outer row or the inner row of the turret 2 is to be used is selected by moving the striker 29 with the selection cylinder 32 of the ram 12. In this state, by lowering the ram 12 with the punch drive source 15, the desired punch tool 7 is hit with the striker 29, and a punch hole is formed in the work W by the punch tool 7.

If a strip error occurs after the machining, that is, the workpiece W is removed from the shearing blade 26 of the punch tool 7.
If a failure that does not come off occurs, the punch tool 7 cannot be lifted due to the weight of the work W. On the other hand, even in this state, the ram 12 attempts to rise from the bottom dead center, so that the striker 29 of the ram 12 is separated from the punch tool 7. Therefore, the operating member 47 is also moved by the urging force of the spring 46 in FIG.
(D), the exhaust path 52 is opened. That is, when the striker 29 does not strike the punch tool 7, the operating member 47 is at the lowered position as shown in FIG. 4D, the exhaust path 52 of the air path 50 is open, and the punch tool 7 is At the time of the hitting while pressing, it hits the punch tool 7 and rises as shown in FIG. 4A to close the exhaust path 52. Therefore, when the stripping is performed properly, when the striker 29 rises to a predetermined return position of the punch tool 7, the operating member 47 descends with respect to the striker 29, and the exhaust path 52 is opened. When a strip error occurs, when the striker 29 is about to rise from the bottom dead center, the operating member 47 is separated from the punch tool 7 and descends, and the exhaust path 52 is opened. When the exhaust path 52 is opened, the air pressure in the air path 50 decreases, and this decrease is detected by the air pressure sensor 56. The judging means 59 determines that the detection of the pressure drop of the air pressure sensor 56 is performed earlier than at an appropriate time, that is, when the ram 12 returns to the height corresponding to the rising return height of the punch tool 7, It is determined that a strip mistake has occurred.

As described above, according to the punch press having this configuration, the operation provided on the striker body 35 without forming an electric circuit between the striker 29 serving as the hitting means and the punch tool 7 as in the conventional example. The state of the member 47;
The presence / absence of a strip error can be reliably determined with a simple configuration from the vertical position of the striker 29. The operating member 4
Reference numeral 7 is provided partially below the striker body 35 independently of the portion that strikes the punch tool 7, and the operating member 47 is not beaten, so that the life of the mechanical abnormality detection mechanism is improved. Also, in the case where a stray mistake occurs, when the striker 29 attempts to ascend from the bottom dead center as described above, the operating body 47 descends away from the punch tool 7, and
Since the determination unit 59 determines that a strip error has occurred, a strip error can be detected even when the height of the striker 29 in each punching operation is low, such as during continuous processing such as nibbling processing. A packing for sealing is arranged in the beating portion at the upper center of the punch tool 7 so that the flow path 36 and the flow path 39 on the side of the striker body 35 communicate with each other in an airtight manner at the time of the beating shown in FIG. In some cases. However, in this embodiment, since the operating member 47 is arranged at a position away from the center of the striker body 35 as described above, the operating member 47 can be protruded and retracted from the striker body 35 without being hindered by the packing or the like. Can work.

When the ram 12 is located between a predetermined height corresponding to the rising and returning height of the punch tool 7 and the top dead center, the second judging means 59A makes contact between the punch tool 7 and the striker 29. When the air pressure sensor 56 detects that the air pressure sensor 56 is operating, it is determined that the detection function has a failure, such as a strip error detection function or a failure of the air pressure sensor 56 itself. As the operation of the punch press, when the ram 12 is located between the height corresponding to the rising return height of the punch tool 7 and the top dead center, the punch tool 7 and the striker 29 may be in contact with each other. The contact between the punch tool 7 and the striker 29 during this time is detected by the air pressure sensor 5.
When No. 6 is detected, a detection abnormality occurs. Thus, by providing the detection abnormality determination means 59A, when a failure occurs in the strip error detection function, the operator can know the occurrence of the failure, and the reliability of the strip error detection function can be improved. it can.

In the above embodiment, as shown in FIG. 4, the upper end of the elevating guide 47b of the operating body 47 is connected to the valve body 47c having the same diameter as the other parts of the elevating guide 47.
However, it may be configured as shown in FIG. That is, the valve body 4 provided at the upper end of the elevating guide portion 47 of the operating body 47
7c is connected to an air path 50 having a smaller diameter than the guide hole 49.
Shall be fitted. The exhaust path 52 is communicated with an intermediate portion of the small-diameter air path 50 so as to be opened and closed by the valve body 47c as the operating body 47 moves up and down. Also, the above embodiments have been described with respect to the case where the present invention is applied to a turret punch press.
Instead, the present invention can be applied to a punch press using a cartridge or another tool holder.

[0025]

The punch press according to the present invention is provided with a punch tool for processing a plate material, a beating means for beating the punch tool, and a biasing means provided on the beating means and constantly urged downward.
An operating member that moves upward when the beating means abuts on the upper part of the punch tool, a detecting means for detecting a state of the operating member, a monitoring means for monitoring an ascending and descending position of the beating means, and Since the punching tool is provided with the determining means for determining the mechanical abnormality based on the elevating position and the detection result of the detecting means, even if the punching tool is of any shape or material, the hitting means may not contact the upper surface of the punching tool. if,
Abnormality can be determined. In this configuration, when the operating member is partially provided below the hitting means independently of the portion that hits the punch tool, the operating member is not hit and the life is improved. Further, in these configurations, when the abnormality determination unit is a strip error determination unit that determines a strip error when it is detected that the contact unit is not in contact with the device when the beating unit returns to the ascending position, Strip errors can be reliably detected with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a side view of a punch press according to an embodiment of the present invention.

FIG. 2 is a partial plan view of a turret of the punch press.

FIG. 3 is an enlarged cross-sectional view showing a part of a punch tool and a punch driving mechanism and a periphery thereof;

4A is a longitudinal sectional view showing a striker and its periphery in a ram, FIG. 4B is a bottom view of the striker body, FIG. 4C is a sectional view taken along the line II in FIG.
FIG. 4 is a vertical cross-sectional view of the striker body showing a protruding state of the operating member.

FIG. 5 is an enlarged cross-sectional view showing a punch tool at the time of beating and its periphery.

6A is a longitudinal sectional view showing a striker of a ram according to another embodiment and its periphery, FIG. 6B is a bottom view of the striker body, and FIG. 6C is II-II in FIG.
FIG. 3D is a vertical cross-sectional view of the striker main body showing a protruding state of the operating member.

[Explanation of symbols]

 7 punch tool 29 striker (beating means) 35 striker body 46 spring 50 air path 52 exhaust path 56 air pressure sensor (detection means) 58 monitoring means 59 determination means (strip error determination means)

Claims (3)

[Claims] 1. A punch tool for processing a plate material, a beating means for beating the punch tool, and provided on the beating means and constantly urged downward, and the beating means contacts an upper part of the punch tool. An operating member that moves upward by
A detecting unit that detects a state of the operating member; a monitoring unit that monitors an ascending / descending position of the hitting unit; Punch press. 2. The punch press according to claim 1, wherein the operating member is provided at a lower portion of the beating means and independently of a portion for beating the punch tool. 3. The strip error judging means is a strip error judging means for judging a strip error when the detecting means detects that no contact is made when the beating means returns to the ascending position. Or the punch press according to claim 2.