JPS61172632A - Device for movement control of material to be worked in punching press - Google Patents

Abstract

PURPOSE:To perform the movement of the material to be worked without waiting time efficiently and quickly by temporarily separating a striker and punch at the ascending time of a striker and by moving the material to be worked with detecting thier re-contact thereafter. CONSTITUTION:A punch 1 punches the material 15 to be worked with the descent of a ram 11. The punch 1 is pushed up by a strong stripping spring 9 according to the ascent of the arm 11 which was at the bottom dead center after completion of the punching and is ascended until hitting the shoulder part of the guide 7. The punch 1 hit the shoulder part is then ascended with the guide 7. The lifting speed of the guide 7 at the lifting starting time is smaller, compared to the ram 11 having the prescribed lifting speed due to the force of a lifter spring 21 being weaker compared with the force of the stripping spring 9. The separation of the striker 13 and punch head 1-2 is therefore caused once and after the lapse of some time the ram 11 and head part 1-2 come into contact again. This contact is detected by a detecting device 19 and with the movement command signal of the material to be worked of NC control part the succeeding punching work of the material to be worked is passed into.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a punch press, and more particularly to a movement control device for a workpiece in a punch press that accurately moves the workpiece.

The movement of the workpiece in a conventional punch press is such that the angle of the eccentric axis of the press after punching is the value that is expected when the punch punches the workpiece of maximum thickness and completely passes through the workpiece. This was also done when the ram of the press was in contact with the punch.

However, since the movement command for the workpiece was set to correspond to the case where the workpiece has the maximum thickness, in the case of punching a thin plate, after punching, Since there was still a considerable amount of time left, there was a problem in that there was a lot of wasted time and it was not possible to increase the heat rate, especially in high-speed punching. Generally, after the ram of the place reaches the bottom dead center and punching is performed, the workpiece remains in contact with the punch guide, and only the punch rises together with the ram, causing the shoulder of the punch to rise. When the punch hits the punch guide, the punch unites with the punch guide and begins to rise, but the punch guide moves from a stationary state to the force of the lifter spring, and the lifter spring is much smaller than the stripping spring. Because it is weak, the rising speed is slow, and it is not possible to follow the ram of the press that is rising at a predetermined speed, and the ram of the press and the punch will separate, so the conventional punch In the press, there is a problem in that even if there is no stripping error, the stripping error may be detected and the stripping drive may be stopped.

The present invention has been made in view of the above, and an object thereof is to provide a movement control device that can accurately move a workpiece in a punch press. In order to achieve the above object, when the vertically movable striker in the punch press contacts and processes the punch head and rises from the bottom dead center to the top dead center,
A re-contact detection means detects that the striker makes contact again after being temporarily separated from the punch head, and a workpiece movement command signal (
AEFX).

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 3, 1 constitutes a mold together with a die 3, and a bolt 5 together with punch head parts 1-2 and 1-3.
The punch 1 is inserted into the hollow part of the guide 7 so as to be vertically movable, and the shoulder part 7-1 of the guide 7 is supported by the stripping spring 9.
is being forced to. 11 is a workpiece 15 placed on the die 3 by urging a striker 13 provided at its lower part against the punch head 1-2 of the punch 1 by rotation of a crankshaft (not shown). The ram 11 is electrically insulated from the punch press body by an insulating plate 17, and the ram 11 is electrically insulated from the punch press body by an insulating plate 17.
A weak voltage is applied from 19. Note that the guide is supported at a constant height within the holder 27 by a lifter spring 21, a collar 23, and a shoulder screw 25.

The detection device 119 has a circuit configuration as shown, for example, in FIG. Processing is performed based on the striker signal (ST) caused by contact with punch 1, and the NCI! of the punch press is processed. When the punch press is operating normally, the workpiece movement command signal (AEFX) is sent to the iIJ 8 section (not shown), and when the operation is abnormal due to a stripping error of punch 1, the stripping error signal ( ASM). Note that the detector for the rotation angle of the crankshaft includes, for example, an adjustable dog (not shown) attached to the crankshaft and a plurality of proximity sensors (not shown) that detect each dog. , these dogs are located at the position where the top dead center of the punch 1 is detected (for example, ±40° with respect to the top dead center of the crankshaft) and at the punch completion position (for example, when the rotation angle of the crankshaft is between 265° and 34°).
It consists of a movable dog so that the angle can be set in advance (5°). In addition, in FIG. 4, reference number 101.
Reference numerals 103 and 105 indicate photocouplers, which remove the influence of noise from the top dead center approach signal (CU), punch completion approach signal (EFX), and striker signal (ST) from the ram 11. In addition, reference numbers 107 and 109 also indicate photocouplers, and the workpiece movement command signal (AEFX) and top dead center signal (ACtJ), respectively.
This is to supply the NG control section of the punch press without being influenced by noise.

Figures 5 and 6 are time charts showing the operation of this embodiment. Figure 5 shows when the punch press is operating normally, and Figure 6 shows when an abnormality occurs in the punch press due to a stripping error. shows.

The operation of this embodiment will be explained with reference to the figures explained above.

First, to explain the case when the punch press is performing the machining operation normally, after turning on the power to the punch press (see Figure 1), along with a punching start machining command, the ram 11 descends and the When the striker 13 starts urging the punch head section 1-2, the guide 7 descends against the relatively weak lifter spring 21 and presses and fixes the workpiece 15 onto the die 3. Then, the bunch 1 that has descended with the guide 7 is further pushed down against the strong stripping spring 9, and at the bottom dead center of the ram 11, the workpiece 15 is punched by the bunch 1 and the die 3. (See Figure 2). At this time, the guide 7 is in contact with the workpiece 15, so the lifter spring 21 is held at a constant length indicated by reference symbol B with respect to the thickness of the workpiece 15. As the ram 11, which was at the bottom dead center, rises, the bunch 1 is first pushed up by the strong stripping spring 9, and the bunch 1 is forced to follow the rising speed of the ram 11 from the workpiece 15. Shoulder 7-1 of guide 7
It rises following the upper bound speed of ram 11 until it hits (
(See Figure 3).

Next, the bunch 1 that hit the shoulder 7-1 starts to rise together with the guide 7 by the lifter spring 21.
Since the guide 7 starts moving from a stationary state and the force of the lifter spring 21 is weaker than the force of the stripping spring 9, the rising speed of the kite 7 when it starts rising is lower than the ram 11 which already has a predetermined rising speed. Although the striker 13 and the punch head section 1-2 are once separated, the ram 11 and the punch head section 1-2 come into contact again after a certain period of time, and this contact is detected by the detection device 19. NGI of bunch press by detecting
11 outputs a movement command signal for the workpiece in the control section and moves on to punching of the next workpiece.

The fourth electrically controlled operation when the above punch press is normal.
To explain using the diagram and FIG. 5, when the punch press is powered on, the output signal level of the NAND circuit 113 in the reset circuit 111 changes from low level (L) to high level (H), causing the flip 70 whelks 1
15 and 117 are cleared. In addition, the top dead center proximity signal (CLJ) is at a high level (H) due to the signal from the proximity sensor for the dog attached to the crankshaft.
The bunch completion proximity signal (EFX) is low level (L),
On the other hand, since the striker 13 and the bunch 1 are not in contact, the striker signal (ST) is at a high level (
H) are each input to one detection device.

Then, when the ram 11 starts descending and the rotation angle of the crankshaft reaches 40', the top dead center proximity signal (CtJ) changes from high level (H) to low level (L), and the flip-flop 119 outputs this signal. (CLJ) input terminal (C)
Since the input is more than 1, the Q of the flip-flop 119 is
The 119 output changes from O-level (shi) to high level (H). However, the output signals of other circuits remain unchanged.

Then, the crankshaft continues to rotate, and the striker
13 and the punch head part 1-2, the striker signal (ST) changes from high level ()-1) to low level (L), and in this state, the ram 11 reaches the bottom dead center. After the workpiece 15 is punched by the bunch 1 and the die 3, the ram 11 at the bottom dead center starts to rise.

Then, when the bunch 1 hits the shoulder 7-1 of the guide 7 and the punch head 1-2 separates from the striker 13, the striker signal (ST) changes from a low level (S) to a high level. After reaching the level (H) and after a certain period of time has passed, the punch head section 1-2 is moved again to the striker 13.
When the striker signal (ST) becomes low level (L), the punch completion proximity signal (EFX) changes from low level (L) to high level (I').
), the output of the NAND circuit 121 becomes high level (
By changing from H) to low level (L), the flip-flop 119 is reset (a signal changing from O-level (L) to high level (H) is applied to the R> terminal, so the flip-flop 119 is cleared, and the Q119 output changes from high level (H) to low level (L).
becomes. Due to the fall of the QI+9 output, the output signal of the NAND circuit 123 changes from low level (L) to high level (H), so that the mono multivibrator 1
25 is operated, a pulse signal having a predetermined pulse is output from the output terminal of Q125, and this pulse signal is sent as a workpiece movement command signal (AEFx) via an inverter 127 and a photocoupler 107. It is output to the NC control section of the punch press. In addition, the top dead center signal (A
CtJ> is mono-multivibrator 125 and 12
By performing a NAND between the ◇125 and σ129 outputs in 9 and the top dead center proximity signal (CU), troubles in the NC sequence of the NG ib control section due to overlap of punch completion and stripping miss signals and top dead center can be avoided. When it is for a purpose and is not a stripping mistake (Q 12 q
output is high level (H)), workpiece movement command signal (A
EFX) is not output (Q125 is at high level (H)), and when the top dead center proximity signal (CU) is at high level (H) as the output of the NAND circuit 130,
A high level (H) signal is output to the NG control section.

Next, to explain the case where the punch press makes a stripping error, the workpiece 15 is punched by the punch 1 and die 3, as in the normal operation described above (see Figs. 1 and 2). After punching is completed, the punch 1 attempts to rise following the rising speed of the ram 11, which was at the bottom dead center, but the punch 1 is stuck in the punched hole of the workpiece 15. , the workpiece 15 is not stripped, and as a result, only the ram 11 rises, and the punch 1
does not rise, so once the striker 13 and the punch head portion 1-2 are separated, the striker 13 and the punch head portion 1-2 do not come into contact again. Therefore, N01
A stripping error signal (ASM) is output to the section 1311, the punching is temporarily interrupted, and the processing is restarted after eliminating the cause of the stripping error.

To electrically explain the case where the above punch press causes a stripping error using FIGS. 4 and 6, it is the same as the normal case described above until the workpiece 15 is punched. However, due to a stripping error, the punch 1 bites into the workpiece 15 (at X, only the ram 11 rises, the strusker 13 separates from the punch head 1-2, and the strusker signal (ST) changes from low level (L) to high level (H), and this high level (H) state continues, so the punch completion proximity signal (EFX) goes to low level (EFX) at the position where the crankshaft rotation angle is 265°.
At the point when the output of the NΔAND circuit 131 changes from high level (1'') to high level (H), the output changes from high level (1'') to low level (
Since the signal from the low level (L) to the high level (H) is supplied to the (D) terminal of the flip-flop 115 via the inverter 133, the rotation angle of the crankshaft becomes 3200. top dead center proximity signal (CU)
When Q++s goes from a low level (L) to a high level (H), the output of Q++s of the flip-flop 115 changes from a low level (L) to a high level (H), thereby causing the mono multivibrator 129 to operate, A pulse signal having a predetermined pulse width is outputted from the output Q129 and applied to the relay driving section 135. The drive unit 1
For example, 35 relays have 20 to 30 relays depending on the self-holding time.
Strip miss signal of 1sec pulse signal @(ASM)
It is output to the NG control unit as

Therefore, according to this embodiment, the workpiece is moved when the striker provided at the tip of the ram and the punch head re-contact after punching is detected. By adjusting the angle at which the punch is completed by moving the dog according to the conditions such as the thickness and material of the workpiece, it is possible to perform high-striking processing without wasting time according to the thickness of the workpiece. Furthermore, if a stripping error occurs, re-contact between the striker and the punch head after punching is not detected, so that the stripping error can be reliably detected.

As can be understood from the above description of the embodiments, the gist of the present invention is as described in the claims. and the punch are temporarily separated,
As soon as re-contact is detected thereafter, movement of the workpiece is started. Therefore, there is no need for the waiting time as in the conventional method, and the workpiece can be moved efficiently and quickly, and the workpiece will not be moved in the event of a stripping error.

Note that the present invention is not limited to the above-mentioned embodiments, and may be implemented in other embodiments with appropriate changes.

[Brief explanation of the drawings] Figure 1 is a state diagram of the mold when the ram is at the top dead center, Figure 2
The figure shows the state of the mold when the ram is at the bottom dead center, Figure 3 shows the state of the mold when the press hits the shoulder of the guide after punching, and Figure 4 shows the circuit of the detection device. FIGS. 5 and 6 show time charts for the case where the punch press operates normally and when a stripping error occurs, respectively.

Claims (1)

[Claims] (1) When the vertically movable striker 13 of the punch press comes into contact with the punch head 1-2 of the punch 1, lowers it, and rises from the bottom dead center to the top dead center, the punch press head 1-2 Re-contact detection means for detecting that the striker 13 has re-contacted after being temporarily separated;
A workpiece movement control device in a punch press, comprising command signal output means for outputting a workpiece movement command signal (AEFX) based on a signal from the re-contact detection means.