JPH0315216Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] This invention relates to a press device, and in particular improves a mechanism that detects whether or not a workpiece material is in a fixed position and controls the drive of continuous operation. Regarding.

[Technical background of the invention and its problems]

In a press device, it is necessary to constantly detect whether or not a workpiece material is being conveyed to a predetermined position with respect to a mold to control the drive of the ram. Conventionally, a limit switch such as a micro switch is attached to the crankshaft of a press, and materials are fed sequentially at the timing determined by the limit switch. For the bed and ram of a press, the molds are typically replaced for various processing purposes, and the timing switch must be readjusted for each mold. Therefore, there are disadvantages in that adjustment is complicated and highly accurate detection is difficult to obtain.

[Purpose of invention]

This invention eliminates the above-mentioned disadvantages and provides a press device that is relatively easy to adjust and can perform highly accurate material detection and drive control.

[Summary of the idea]

This idea includes a material detector that detects the existence of a workpiece material in a fixed position based on the presence or absence of electrical continuity, and a timing detector that detects the timing when the ram is at the bottom dead center based on the presence or absence of electrical continuity. The detectors are installed integrally with the upper and lower molds of the mold mounted on the stand, and both detectors are electrically turned on and off.
This is a press device in which the drive of the ram is controlled by a controller that receives an OFF signal. As a result, the detection mechanism for the workpiece material is integrated into the mold itself, so there is almost no need to readjust the timing etc. even when the mold is attached to another press machine. High-precision detection and drive control unique to the mold are possible.

[Example of idea]

Examples thereof will be described below with reference to the drawings. Note that the same parts are represented by the same symbols.

In this embodiment, an anode vane 21 of a microwave oven magnetron made of a copper plate as shown in FIG.
This is a device that continuously manufactures by press punching. This anode vane 21 has three steps on both sides.
It has a set of slits 22, 23, and 24. The plate thickness is 2.0mm, width is 9.5mm, and length is 13mm.
It is. As shown in FIG. 12, this vane is made by sequentially feeding a long copper plate workpiece 25 to a predetermined position in a mold of a press device, and using a press blade of a predetermined shape to form a vane 21 in the shape shown by solid lines and dotted lines. It is stamped and formed. Therefore, the shaded part 2 at the tip
6 is removed as scrap. In this embodiment, it is determined whether the leading end portion 26 of the material to be scraped is in a predetermined position within the mold.
The vertical movement of the press ram is detected near the bottom dead center, and if there is material in this predetermined position and it is normal, the press continues to be driven, and if there is no material in the predetermined position, the clutch of the press device is disengaged. It is controlled so that it stops immediately.

This embodiment is schematically shown in FIGS. 1 and 2. In the same figure, reference numeral 31 is an upper die of a die mounted on a press ram (not shown), 32 is a press blade for vane punching which is a part thereof, 33 is a lower die attached to a press stand (not shown), 34 is a knockout, 25 35 is the workpiece material, 35 is the press drive device,
36 is a clutch, 37 is a controller for controlling the clutch, 41 is a workpiece material detector, and 42 is a timing detector. The material detector 41 is fixed to the upper die 31 of the mold via an electrically insulating plate 43. This detector has a detection pin 4 made of conductor.
4, and this detection pin has a detection pin holder 4.
5 and a spring 46 so as to be able to move up and down. The detection pin 44 is then located at a position corresponding to the normal home position of the tip 26 of the material 25. Further, the timing detector 42 includes a timing pin 47 made of a conductive material, an insulating sleeve 48 surrounding it, a holder 49 for the timing pin made of a conductive material, and a spring 50 that are connected to the upper mold 31.
Similarly, it is fixed via an insulating plate 43. In addition, the adjustment bolt 51 is attached to the fixing nut 52 on the lower mold 33.
Fixed and height adjustable. A timing pin 47 descends and comes into contact with the head 51a of this adjustment bolt. In this way, the material detection pin 44, the timing pin 47, and the timing holder 49 are provided electrically insulated from the upper mold 31.

The material detection pin 44 is connected to a terminal a of the controller 37 by a lead wire 44a via a spring. Further, the timing pin 47 is connected to a terminal b of the controller via a spring 50 and a lead wire 47b. Further, the timing pin holder 49 is connected to a terminal c of the controller by a lead wire 49c. Furthermore, the lower die 33 is made of material 2.
5, and the lead wire 33d
is connected to the terminal d of the controller 37.

Next, the operation will be explained.

In FIG. 1, in this state where the press ram is at the top dead center, the material detection pin 44 is naturally away from the workpiece material 25, so the terminal a of the controller and the terminal d connected to the material and the lower die are As shown in FIG. 3, it is in an open state, that is, an electrically OFF state.
On the other hand, the timing detector 42 has a timing pin 47 fixed to an adjustment bolt 5 fixed to the lower die.
1, but the large diameter part 4 of this pin
7a is electrically short-circuited to the conductor holder 49, and both terminals b and c of the controller are connected as shown in FIG. 3 and are in the ON state. In the controller, these terminals are connected in parallel as shown in FIG. 3, and the X and Y terminals at both ends are electrically connected to an on/off control device (not shown) for the clutch 36. If there is an electrical short circuit between X and Y,
This press device is normally driven and configured so that the ram continues to move up and down. This state is also a state in which the upper die is at the top dead center, that is, at 0 degrees in the operation diagram shown in FIG.

Next, the state at the moment when the ram descends and the material detection pin 44 abuts on the tip end 26 of the workpiece material which is in a fixed position is shown in FIG. In this state, the detection pin 44 is in contact with the material 25, so the sixth
As shown in the figure, terminals a and d of the controller are turned on, and terminals b and c are also turned on. This corresponds to position 5a in FIG. This detection pin confirms that the tip end 26 of the workpiece material is in a predetermined position, and the press continues to operate normally.

When the ram further descends slightly, the detection pin 44
continues to be in contact with the tip 26 of the material, and the pin 47 on the timing detector side is pressed against the adjustment bolt 51.
is pushed up by the cylindrical portion 51a. Then, the large diameter portion 47a of this pin 47 is electrically separated from the holder 49, and the terminals b and c are turned off. This is the fourth
This is the state shown in 5b of the figure. However, since terminals a and d are electrically short-circuited, normal operation continues.

Next, when the ram is at the bottom dead center, a portion that will become the anode vane 21 is punched out by a press blade, as shown in FIGS. 7 and 8. At this time as well, the spring 46 contracts and the detection pin is pushed upward while remaining in contact with the tip 26 of the material to be scrapped. Timing pin 47 is similarly pushed upward and remains electrically separated from holder 49. Therefore, since terminals a and d are short-circuited, normal operation continues. This is shown in Figure 4.
This is a position corresponding to 180 degrees, or 7a. After that, when the ram rises, the timing pin 47 first makes electrical contact with the holder 49 and the terminals b and c are connected.
It turns ON, and after a short delay, the detection pin 44
is away from the material tip 26 and between terminals a and d.
It becomes OFF. Then, the machine returns to the top dead center, that is, the 360-degree position, and the workpieces are fed in order until the tip is located at a predetermined position, and then the same operation is repeated.

However, if the workpiece material is not fed to a predetermined position, the detection pin 44 does not come into contact with the material even if the ram descends to near the bottom dead center, as shown in FIGS. 9 and 10, so the controller terminal OFF between a and d
It will remain as it is. and the other timing pin 47
When the adjustment bolt is placed and terminals b and c are turned OFF, the terminals X and Y are completely OFF.

This immediately disengages the clutch, disconnects the ram from the press drive, and stops the vertical movement. A signal is also generated to indicate this abnormality and the necessary alarm is issued. This makes it possible to immediately stop the apparatus and detect and remove defective products from the product. These detectors and the timing detector that determines the timing of their operation are both integrally provided within the mold, so simply attaching this mold to another press machine will reduce its detection accuracy. It can be easily installed without any hassle. Also, electrically turned on by the detection pin
-OFF change and ON by timing detector-
The time between OFF and OFF changes can be very easily fine-tuned by adjusting the adjustment bolt.

It goes without saying that in the timing detector, the mechanical part having the pin and the adjusting bolt part may be attached to the mold upside down. Further, the adjustment bolt is not essential, and the timing pin may be configured to abut on a part of the mold instead of warping.

[Effect of idea]

As explained above, according to this invention, the detection mechanism for the workpiece material is integrated into the mold itself, so there is no need to readjust the timing etc. even when the mold is attached to another press machine. It is almost unnecessary and allows for highly accurate detection and drive control specific to the mold. High-precision detection and control can be achieved with a relatively simple structure.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of the main part of an embodiment of this invention, Fig. 2 is a sectional view taken along line 2-2 in Fig. 1, Fig. 3 is a circuit diagram showing the short-circuited state of each terminal of the controller, and Fig. 4 5 and 6 are state diagrams and circuit diagrams for the next step, FIGS. 7 and 8, and FIGS. 9 and 10 are state diagrams and circuit diagrams for the next step, respectively. The circuit diagram, FIG. 11, and FIG. 12 are a perspective view and a plan view, respectively, showing examples of products and materials formed by pressing. 21...Product, 25...Material to be processed, 26...
Tip portion thereof, 31... Upper die of the mold, 33... Lower die, 35... Press drive device, 36... Clutch, 37... Controller, 43... Insulating plate, 41...
Material detector, 44...Detection pin, 42...Timing detector, 47...Timing pin, 48...
Insulating sleeve, 49...Holder, 46, 50...
Spring, 51...adjustment bolt, a, b, c,
d...Terminal.

Claims (1)

[Scope of utility model registration request] A material detector that detects whether the workpiece material is in a fixed position by checking whether there is electrical continuity or not, and a timing detector which detects the timing when the ram is at the bottom dead center by checking whether there is electrical continuity are attached to the press ram and the stand. The ram is configured to be integrally fixed to the upper and lower molds of the mold to be used, and to control the driving of the ram by a controller that receives electrical ON/OFF signals from both of the detectors. Characteristic press equipment.