JP3412782B2 - Punch press - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punch press ,
More particularly, the present invention relates to a punch press which can improve the processing efficiency while reliably avoid interference of the workpiece clamper and the die. 2. Description of the Related Art Conventionally, in a press machine such as a turret punch press, in a normal region where there is no possibility that a work clamper for gripping and positioning a work and a mold for punching work interfere with each other, Is punched by so-called rising edge striking, which starts from an intermediate position. Accordingly, the stroke amount of the ram is small and the time required for punching is short, so that the processing efficiency is good. On the other hand, an area where the work clamper and the press die interfere with each other is defined as an override area. In this area, the ram is started from the highest position in order to prevent the work clamper and the die from interfering with each other. It is performed by hitting the dead center. Therefore, in this override area, the stroke amount of the ram that hits the punch is long, and the number of hits is accordingly reduced. However, when the moving speed is slow, it is not necessary to widen the override area. Therefore, the processing efficiency is not much of a problem. [0004] However, recently, in order to improve the processing efficiency, the workpiece is moved at a very high speed as compared with the turret punch press described above. In the range of the override area that was set, the work was too narrow to stop the work. Therefore, the override area must be set widely according to the speed. As the range of the override area is expanded, the processing range by top dead center striking is greatly increased, and the problem that the processing efficiency is significantly reduced occurs. Have been. SUMMARY OF THE INVENTION An object of the present invention is to pay attention to the above-mentioned conventional technology, and it is possible to move a workpiece at high speed without lowering the processing efficiency and to reliably prevent interference between a workpiece clamper and a mold. punch-flops that can be avoided
Is to provide a lesson . [0006] The conventional problems as described above.
In view of the above, the present invention provides a work clamper
Is provided so that it can be moved and positioned in the X-axis and Y-axis directions.
Punching for the workpiece positioned at
In a punch press with a ram that strikes the mold,
The X-axis and Y-axis directions are centered on the center of the
Provide a barride area and the override area
Around the periphery of the deceleration area, the deceleration area,
Moves when the work clamper is moving at the normal moving speed
The work crank cannot be stopped due to coasting after the stop command.
Is in the range where the
The moving area is moving at a speed lower than the normal moving speed.
Coasting after the movement stop command in the
Is an area where the tool interferes with the mold, and
The position of the clamper is determined by the deceleration area detection means.
The movement speed of the work clamper is reduced when detected.
To move at low speed and start the ram from the rising end.
The end of the lift
Override area detection that the kuk clamper is located
Movement of the work clamper when detected by the means
At the top dead center, starting the ram from top dead center
It is configured to perform a beating. A preferred embodiment of a work positioning device 1 in a punch press according to the present invention will be described below with reference to the drawings. Referring to FIG. 4 and FIG. 1 and FIG. 2, an override area OR having a narrow range on the fixed table 3 around the mold center KC and a deceleration area DR around the override area OR are provided. It is. The sum of the override area OR and the deceleration area DR corresponds to the conventional concept of the override area. Here, the deceleration area DR means that if the vehicle is moving at a normal moving speed (high speed) as the moving speed increases, the work clamper 5 cannot be stopped by coasting after a movement stop command, and the work clamper 5 is moved upward. It means the range that interferes with P. Accordingly, when the work clamper 5 enters the deceleration region DR, the range in which the speed is reduced to a predetermined low speed is shown. In this range, as in the case of the normal machining, the ram 7 is started from the middle height position to perform the rising end. The override area OR means an area in which the work clamper 5 interferes with the upper mold P due to coasting after a movement stop command in a state of low speed movement in the deceleration area DR. Therefore, in this range, the work clamper 5 and the die interfere with each other according to the rising end of the ram 7, and thus the upper dead center hitting from the point moved to the uppermost position is required. FIGS. 1 and 2 show the aforementioned deceleration region DR.
A turret punch press 9 as a punching machine considering the override area OR is shown. The turret punch press 9 is used for the frame 1
The frame 11 is provided with a gap portion 13 at a central portion thereof. An upper turret 15 having a plurality of upper dies P mounted thereon and a lower turret 17 having a plurality of lower dies D mounted thereon are rotatably indexed to the gap portion 13. A ram 7 is provided above the upper turret 15 so as to be vertically movable.
A striker 19 for striking the upper die P is provided at a lower end of the ram 7.
Is provided. Accordingly, the desired upper die P and lower die D are selected, and the ram 7 is lowered with respect to the work W positioned between the upper die P and the lower die D, and And punching is performed in cooperation with the lower mold D. A fixed table 3 is provided in the gap 13.
The movable tables 21L and 21R are provided on both left and right sides (upper and lower sides in FIG. 1) of the fixed table 3. Below the movable tables 21L and 21R, a pair of guide rails 23 is provided in the Y-axis direction (the horizontal direction in FIGS. 1 and 2).
Sliders (not shown) that move along 3 are provided on the lower surfaces of the movable tables 21L and 21R, respectively. Further, on the upper surface of the fixed table 3, a number of free bearings 25 for movably supporting the work W are provided. At the right end in FIG. 1 on the upper surfaces of the movable tables 21L and 21R, left and right movable tables 21L and 21R are provided.
A carriage base 27 connecting the 1Rs is provided across the fixed table 3. Accordingly, the carriage base 27 moves in the Y-axis direction integrally with the left and right movable tables 21L and 21R. In order to move the movable tables 21L, 21R and the carriage base 27, a Y-axis drive motor MY is provided at the right end of the frame 11, and the carriage base 27 is moved via a drive mechanism (not shown). Thereby, the movable tables 21L and 21R are integrally moved in the Y-axis direction. The carriage base 27 includes a carriage 29 having left and right work clampers 5 for holding the work W.
Are provided movably in the X-axis direction (vertical direction in FIG. 1). The carriage base 27 is provided with an X-axis drive motor MX for moving the carriage 29 and the work W in the X-axis direction via a gear mechanism (not shown) or the like. With the above construction, the carriage base 27 is moved and positioned in the Y-axis direction by the Y-axis drive motor MY, and the carriage 29 holding the work clamper 5 is moved in the X-axis direction by the X-axis drive motor MX. The workpiece W positioned at the upper die P of the upper turret 15 and the lower die D of the lower turret 17 is processed by the striker 19 hitting the upper die P. On the other hand, referring to FIG. 1, a limit switch 31 for detecting a Y-axis deceleration area DR for detecting a deceleration area DR in the Y-axis direction, and a Y-axis override for detecting an override area OR in the Y-axis direction. An area detection limit switch 33 is provided on the fixed table 3,
In correspondence with these, the movable table 21 is provided with a Y-axis dog 35. The carriage base 27 has X
An X-axis deceleration area dog 37 for detecting an axial deceleration area DR and an X-axis override area dog 39 for detecting an X-axis override area OR are provided. Correspondingly, each work clamper 5 is integrally provided with a limit switch 41 for detecting the X-axis deceleration area and a limit switch 43 for detecting the X-axis override area. The Y-axis dead zone may be stored in the memory of the CPU and collated with a detection result of an amount of movement of the carriage base 27 by an encoder (not shown), as in Japanese Unexamined Utility Model Publication No. 2-53826. Good. Referring also to FIG. 3, the signal from the limit switch 31 for detecting the Y-axis deceleration area and the signal from the limit switch 41 for detecting the X-axis deceleration area are added by an adder 45.
And is input to the override processing unit 47. Therefore, the Y-axis deceleration area detection limit switch 31
Only when both the X-axis deceleration area detection limit switch 41 and the X-axis deceleration area detection limit switch 41 are turned on, the work clamper 5
To be located at The signal from the Y-axis override area detection limit switch 33 and the signal from the X-axis override area detection limit switch 43 are added by an adder 49 and input to an override processing unit 47. Therefore, only when both the Y-axis override area detection limit switch 33 and the X-axis override area detection limit switch 43 are turned on, it is detected that the work clamper 5 is located in the override area OR. As described above, the override processing unit 4
7 detects that at least one of the work clampers 5 is located within the deceleration region DR, instructs the speed setting unit 51 to decelerate the X-axis drive motor MX and the Y-axis drive motor MY to reduce the speed. Moving. In this region, the ram 7 is uplifted as usual. On the other hand, when it is detected that at least one of the work clampers 5 is located within the override area OR, the speed setting unit 51 is instructed to decelerate the X-axis drive motor MX and the Y-axis drive motor MY. At low speed, and the stroke control unit 53 controls the hydraulic cylinder 55 to which the ram 7 is attached so that the ram 7 is hit at the top dead center. FIGS. 5 and 6 show a comparison of the number of hits in the deceleration region DR between the case where the low-speed movement and the rising edge hit according to the present invention are performed and the case where the low-speed movement and the top dead center hit are performed conventionally. The resulting graph is shown. As can be seen from these graphs, according to the present invention, in the deceleration region DR, the machining is performed by the rising end of the ram 7, so that the number of hits that is approximately three times that of the conventional case of performing the top dead center hitting can be obtained. Understand. That is, according to the work positioning device in such a punch press, the range of the new low-speed movement and the ascent of the rising point is newly added to the inside of the override area where the conventional low-speed movement and the top dead center of the ram 7 have been performed. Since the deceleration region DR is provided, the number of hits increases, and the processing efficiency improves. The present invention is not limited to the above-described embodiment, but can be embodied in other modes by making appropriate changes. That is, in the above-described embodiment, the override area and the deceleration area are detected by the limit switch and the dog. However, the NC control can be performed by storing the coordinates of these areas and comparing the coordinates with the coordinates of the work clamper. is there. As described above , according to the present invention,
When the work clamper performs positioning of the workpiece by moving and holding the workpiece in the X-axis direction and the Y-axis direction to perform punching by ram strikes the mold against the work at a low speed a deceleration region around the O Ba <br/> ride area which is an area where Ru is started from the top dead center of the ram moves the workpiece is provided, a low speed work slowed the normal movement speed in this region Since the ram is moved and the ram is started from the rising end, the number of hits is significantly increased as compared with the conventional case where the ram is started from the top dead center with the entire range in which the work clamper and the mold interfere with each other as an override area, Processing efficiency can be improved. [0034]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing one embodiment to which a work positioning device in a punch press according to the present invention is applied. FIG. 2 is a front view as viewed from a direction II in FIG. FIG. 3 is a block diagram showing signal processing from a limit switch. FIG. 4 is an explanatory diagram showing a relationship between an override area and a deceleration area. FIG. 5 is a graph comparing the hit count in the X-axis direction of the deceleration area according to the present invention with the hit count in the related art. FIG. 6 is a graph comparing the hit count in the Y-axis direction of the deceleration area according to the present invention with the hit count in the related art. [Description of Signs] 1 Work positioning device 5 Work clamper 7 Ram 9 Turret punch press 31 Y-axis deceleration area detection limit switch (deceleration area detection means) 33 Y-axis override area detection limit switch (override area detection means) 35 Y Axis dog 37 X-axis deceleration area dog 39 X-axis override area dog 41 X-axis deceleration area detection limit switch (deceleration area detection means) 43 X-axis override area detection limit switch (override area detection means) W Work OR override area DR Deceleration area P Upper die (die) D Lower die (die)

Claims (1)

(57) [Claims] [Claim 1] A work clamper holding a work (W)
(5) is provided so that it can be moved and positioned in the X-axis and Y-axis directions.
And the work (W)
Equipped with a ram (7) for hitting a metal mold
In the press, around the center of the mold (KC)
Override area (OR) in X axis direction and Y axis direction
Around the override area (OR)
A deceleration area (DR) is provided, and the deceleration area (DR)
Moves the work clamper (5) at a normal moving speed
If it is not possible to stop due to coasting after the movement stop command
In the range where the work clamper (5) interferes with the mold,
The override area (OR) is used for the normal transfer.
After a movement stop command while moving at a lower speed than the dynamic speed
The work clamper (5) interferes with the mold due to coasting
In the deceleration area (DR).
The position of the damper (5) is determined by the deceleration area detecting means.
When detected, the moving speed of the work clamper (5) is reduced.
Decelerate to low speed and raise the ram (7)
From the override area.
The work clamper (5) is located in the area (OR)
Is detected by the override area detecting means.
The movement of the work clamper (5) is a low-speed movement and
Configuration to perform top dead center starting from ram (7) from top dead center
A punch press characterized by becoming