JPH0238290B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a control device for a transfer feed in a transfer press.

(Prior art) A transfer feed is composed of two parallel feed bars centered around a mold, and a finger provided on the feed bar in correspondence with the mold. It is configured to grip the material and sequentially convey it to the subsequent mold.

As is well known, a transfer press consists of multiple stages, such as 10 stages, on which molds are installed. For this reason, if product processing is completed in fewer steps than the number of stages, there will be stages where no molds are installed. In this case, it is possible to improve the balance of the mold arrangement by, for example, placing every other mold on each stage, but the molds can be placed consecutively from the base end of multiple stages. When the press is operated under such conditions, the press load is applied only to a portion of the slide and bolster of the press, and as a result, an eccentric load is applied to the press.

In the transfer feed, each finger is provided with a detector (eg, a clamp confirmation switch) for detecting the workpiece, that is, for detecting that the workpiece is properly gripped.
If the workpiece is not reliably gripped by the fingers, the detector outputs a miss-grip signal, and this signal is used to control the press (for example, to stop the press operation).

If a detector is used to detect the presence or absence of material to be processed and the press is controlled by the signal, it is conceivable to immediately stop the press in response to a signal from a misgrip, but if the material to be processed is damaged during the process, it may be difficult to proceed to the next step. If we assume that the press cannot be delivered to another person, the above method would make it impossible to restart the press operation.

Japanese Patent Publication No. 54-23473 proposes a method (commonly known as intermittent operation or tooth extraction operation) in which the press continues to operate without the identified workpiece even when the workpiece is missing.

The proposed conventional technology uses the presence/absence signal of processing material at each stage as an operation signal for the next stage, and even when no processing material is sent to the stage, the previous one If the stage outputs a signal indicating that material is present, the press continues to operate based on this signal. That is, when the material to be processed is missing, the state of no material is sequentially postponed and the operation of the press is continued.

However, in transfer presses, as mentioned above, there are cases where a stage is provided without a mold (however, a material stand is provided in place of the mold to send the processed material to the next stage).
In this case, the proposed prior art cannot perform press operation that sequentially postpones the state in which the processed material is missing, that is, so-called intermittent operation or tooth extraction operation.

Generally, a detector is not attached to a finger corresponding to a stage where a mold is not installed, and a material clamp signal is not output from a finger to which a detector is not attached, and for this reason, a finger corresponding to a stage where a mold is not installed is not equipped with a detector. Even if material is sent, a signal indicating that material is present cannot be sent to the next stage.
Furthermore, if a detector that detects the presence or absence of processing material fails, the detector does not output a signal indicating that material is present, so this situation is the same as when there is no detector. However, even if the detector is out of order, there are times when it is desired to continue production with the detector out of order.

The proposed prior art has a problem in that if there is a stage where no mold or detector is installed, intermittent operation or tooth extraction operation cannot be performed.

(Problem to be Solved by the Invention) The present invention is a transfer press having multiple stages, and even when there is a stage without a mold and clamp confirmation switch, the present invention can solve the problem when the processed material is missing due to a misgrip or the like. It is an object of the present invention to provide a control device for a transfer feed that can perform a press operation in which a state in which there is no processed material is sequentially postponed, so-called intermittent operation or tooth extraction operation.

(Means for Solving the Problems) The means of the present invention includes a material detection means that determines the presence or absence of processed material in a mold provided at each stage by the operation of a clamp confirmation switch provided on a finger corresponding to each stage. , a first storage means for storing information on the presence or absence of a processing material at each stage in the material detection means until the process at the next stage; and the first storage means stores that processing material is present. Instructs the clamp confirmation switch to check the grip of the workpiece in the next process, and when the storage means remembers that there is no workpiece, instructs the clamp confirmation switch to check the grip of the workpiece in the next process. a first determination means for determining that operation should continue even if no mold or clamp confirmation switch is installed; A second stage stores information on the presence or absence of a processed material detected by the material detection means of the previous stage until the next stage of the stage instructed by the instruction switch.
When the storage means and the second storage means memorize that there is a processing material, it instructs the clamp confirmation switch in the next step to check the processing material grip, and the storage means indicates that there is no processing material. The present invention is characterized in that it is provided with a second judgment means which judges that the operation is continued even if the grip of the processed material is not checked by the clamp confirmation switch in the next next process when the memory is stored.

(Function) When molds are installed continuously from the first stage, a clamp confirmation switch is installed on the finger of each stage. When a misgrip occurs, the press operation is brought to an emergency stop.

When a misgrip occurs, the press stops operating, so if the material to be processed is removed from the stage concerned (for example, the second stage), there will be no material to be processed at that stage. However, even if there is a misgrip, if the processed material is ready for use and is placed again in the correct position in the mold, the misgrip will be resolved and the press operation will continue.

If the machining material is damaged due to a misgrip and machining cannot be continued, the material detection means determines that there is no machining material on the second stage where the misgrip occurred, and the next step is performed. In the third stage, the determination that there is no material is stored by the first storage means.

Therefore, when the next process of the press starts, the third stage knows in advance that the material to be processed is not there when it should be there, so it is checked whether the material to be processed has been gripped with the clamp confirmation switch or not. The operation command is issued by the first determination means without checking whether the press is working or not, and therefore the press can continue to operate without processing material.

Furthermore, in the next step, the fourth stage does the same thing based on the third information. At that time, in the third stage, the material to be processed is sent from the first stage, and there is material to be processed in the second stage, so it is stored in the first storage means, and the first judgment means determines whether the material will be processed or not. Instruct them to check the grip of the material as usual.

Next, if a mold and a clamp confirmation switch are not installed at any stage, a stand on which the processed material is placed is provided in place of the mold. However, a finger is installed on the feed bar to grasp the processing material placed on the table.

When operating the press, use the instruction switch to specify the stage without a mold. If you remove the mold from the stage following the specified stage, for example the 3rd stage, then at the 4th stage, for each press step, check whether there is material in the previous stage, i.e. the 2nd stage. The material detection means is used to monitor whether or not there is any. The second storage means stores the information until the next step. Depending on the contents stored in the second storage means, an instruction is given to detect a misgrip at a stage before the stage instructed by the second judgment means, or an instruction is given to continue operation without detection. In other words, in the stage following the stage where no mold and clamp confirmation switch is installed, it is not possible to determine whether or not there was material to be processed in the previous stage, so it is necessary to determine whether or not material to be processed was present in the previous stage. There is.

(Example) FIG. 1 is a plan view showing the product conveying part of the feed bar, and No. 1 to No. 5 indicate stages for setting molds. That is, this example has 5
It is a press with two stages. In the figure, a feed bar 1 is composed of a pair of parallel bars, and the feed bar 1 is provided with a plurality of pairs of fingers 2. Reference numeral 3 designates the workpiece to be clamped by the fingers 2, and LS1 to LS5 designate clamp confirmation switches for the workpiece attached to each finger 2.

The above-mentioned clamp confirmation switch uses a switch that is turned on when there is a material to be processed in the mold and the material is grasped.

Figure 2 shows the operation panel of the transfer feed control device, with the same number of indicator lamps PL as the number of stages.
1 to PL5 and monitor switch 4 are installed,
In addition, an instruction switch 5 is provided for each stage to indicate a stage on which a mold and clamp confirmation switch is not installed.

The indicator lamp is off when the workpiece is operating normally, and lights up to notify you when a misgrip of the workpiece occurs, when the clamp confirmation switch malfunctions, or when the monitor switch 4 malfunctions.

The monitor switch 4 is a three-notch changeover switch that can take three states: monitor on, monitor off, and stage off. As shown in Figure 4, when the monitor is on, the relay
RY11, RY14, RY17, RY20, RY23
operates, none of the relays operate when the monitor is off, and relays RY13, RY16, and RY16 operate when the stage is off.
RY19, RY22, and RY25 are connected to operate.

The use in monitor on is the use of the present invention,
Use with monitor off is when press operation is stopped when a misgrip occurs at any stage. Also, stage off is used to reset the stage when restarting the press after a misgrip occurs and the press comes to an emergency stop. In addition, when molds are installed in succession, if the remaining stage is not used because the number of processing steps is smaller than the number of press stages, that stage is used as a stage off (the condition is that there is a stage that is not used after processing is completed). ). moreover,
If you want to continue press operation even if the clamp confirmation switch is out of order, you can use it by setting that stage to stage off. However, in this case, it is not possible to detect a misgrip at that stage.

The instruction switch 5 is a normal switch that is turned on and off, and when turned on, the relays RY30, RY31, RY32, and RY33 are operated. As mentioned above, this switch is used to specify the stage in which the mold and clamp confirmation switch will not be installed.Since the mold will not be installed in the first stage, it is not necessary for the first stage, so it can be omitted. be.

Figure 3 shows the rotary cam switch RS of the press.
1 to RS5 and clamp confirmation switch LS1 to LS5
It is a relay that operates in Relay RY1~RY4
operate at the timing indicated by diagonal lines in the figure. Relays RY5 to RY9 are turned on when clamping the processed material, and in the example
Turns on at 240 to 55 degrees. These angles are the rotation angles of the crankshaft which is the drive shaft of the press.

The relays shown in FIGS. 5 to 8 are operated by each of the relays described above. In the figure, the letters in lowercase letters are the contacts of the corresponding relays. Further, No. 1 to No. 5 mean respective stages.

FIG. 5 shows a circuit that detects and stores the presence or absence of processing material on the previous stage. That is, it constitutes a material detection means and a first storage means.

This is to confirm that RY35 to RY38 have grasped the workpiece in the 1st to 4th stages.The clamp confirmation switch is turned on at a crank angle of 240°, and when the crank angle exceeds 285°, relay RY2 is activated and self-locks. Retained. Therefore, these relays will not operate if there is a misgrip. Also, if there is no processing material on that stage, it will not work.

Due to the operation of these relays, the relay is activated at a crank angle of 160° when the slide of the press reaches near the bottom dead center.
RY40 to RY43 are operated and self-retained to memorize whether or not the processed material was touched in the previous stage. This is the relay RY at the crank angle of 90° in the next process.
It will be stored until 3 is activated. Therefore, relay RY40 is the second stage, relay RY41
is the third stage, and so on, with a shift of one stage at a time.

FIG. 6 constitutes a second storage means for storing whether or not there is material in the front stage.
In the embodiment, the information a in FIG. 5 is stored with a shift of two stages. In the figure, relays RY47 and RY51 continue to the 6th stage, but in this embodiment there is no mold after the 6th stage, so they are not used.

Specifically, this circuit consists of relays RY40 to RY40, which memorize the presence or absence of material in the previous stage.
Relays RY44 to RY4 that operate according to the operation of RY43
7, and relays RY48 to RY51 that operate when the slide of the press reaches near the bottom dead center and memorize the state of the front and previous stages, similar to the memory circuit on the lower side of Fig. 5, are activated through this relay. It is structured as follows.

FIGS. 7 and 8 constitute first and second judgment circuits that make judgments based on the contact configuration of each relay described above, and are circuits for emergency stop of each stage. Relay RY60, RY62, RY64,
RY66 and RY68 are turned on during normal operation, that is, when there is an operation command, and turned off when an emergency stop command is issued due to a misgrip or the like.
When any one of these relays is turned off, the press automatically stops.

The operations of these circuits will be explained with reference to the flowchart of FIG.

The use of the monitor switch 4 in the OFF position is not particularly different from the conventional case; misgrip is checked for each process, and when a misgrip occurs, the press is brought to an emergency stop. Contact ry11, ry1
4, ry17, ry20, and ry23 remain open as shown. In the figure, if one of relays RY5 to RY9 is not turned on, emergency stop relays RY60 and RY6 will be activated when relay RY1 is turned off.
2... is turned off. In FIG. 9, the reverse contact check is to determine whether the clamp detection switches LS1 to LS5 have been reliably released during unclamping.

The present invention is effectively used when the monitor switch 4 is turned on. In this case, both instruction switches 5 are turned off. In other words, all stages are used continuously.

The flowchart shown in the figure is the flow of one process at one specific stage (the third stage). First, the states of the instruction switch 5 of that stage and the instruction switch 5 of the previous stage are determined, and since they are both off, it is determined whether or not the material to be processed has been placed in the second stage after the end of the process.

When there is a material to be processed in the second stage, relay RY36 shown in FIG. 5 is operated and self-held during the previous process, and relay RY41 is operated to store it in relay RY4. Therefore, the seventh
Since the contact RY41 in the figure is turned off, if a misgrip occurs during the process, when the relay RY1 is turned off, the third stage relay 64 is turned off and the press comes to an emergency stop. If a misgrip does not occur, relay RY7 remains on, so relay 64 will not turn off. After that, there is no difference from the monitor switch off.

When a misgrip occurs and the press comes to an emergency stop, an operator inspects the misgriped workpiece and decides whether to return it to the mold and continue press operation or to remove it as a defective product. When the processed material is removed as a defective product, the monitor switch 4 of that stage is temporarily turned off, the circuit of that stage is reset, and the switch is turned on again.

In this way, for example, if the second stage is operated with no material to be processed, relay RY6 is off, so RY36 remains off. Therefore, the third stage relay RY41 also remains off. Therefore, contact point ry41 in Fig. 7
remains off, and even if contact ry1 turns off, contacts ry17, ry30, ry41, ry4, ry65
Since both remain on, relay 64
is never turned off.

That is, if there is no processing material in the second stage, that information is stored in the third stage,
Based on the memory, the operation is continued without determining whether there is a misgrip at the clamp confirmation switch. Note that the relay RY4 is also used to reset the memory.

Further, for example, when the last stage is not used, the monitor switch for that stage is used in the stage off state. Further, the instruction switch 5 for that stage is turned on. At this stage, if there is no material to be processed, it is normal; if there is material to be processed, it is abnormal; therefore, if material to be processed is detected, the press is brought to an emergency stop.

Next, a case will be described in which the intermediate stage, for example, the third stage, is used without a mold and clamp confirmation switch.

In this case, the third stage instruction switch 5
is turned on, and the instruction switches 5 of the other stages remain off. Therefore, relay RY31 is on. Also, all monitor switches 4 are turned on.

Since the monitor switch 4 is on, the operation shown in FIG. 5 is not particularly different from that described above, and the presence or absence of the processed material at the previous stage is determined. However, since the third stage does not have a clamp confirmation switch, the relay RY37 is never turned on, and therefore the fourth stage relay 42 is also never turned on.

Now, let's consider the fourth stage, which is the next stage after the third stage in which no mold is installed.

As shown in FIG. 9, if the instruction switch 5 of the previous stage is on, it is determined whether or not there is material in the previous stage. That is, since there is no mold in the third stage, the state of the second stage is monitored.
As mentioned earlier in the previous process, when the slide of the press is at the top dead center, relay RY36 operates,
When the bottom dead center is reached, relay RY41 operates and memorizes it. When the crank angle reaches 305 degrees from the bottom dead center and reaches the top dead center again, the relay 1 is turned off, and the relay 41 turns on the relay 45 shown in FIG. 6. When the slide reaches bottom dead center again, relay 4
9 is turned on and stored. That is, the circuit shown in FIG. 6 is a circuit that determines the presence or absence of processed material in the previous stage based on the information shown in FIG. 5, and stores it until the next process.

Based on this information, Figures 7 and 8 are
By the circuit shown in the figure, if there is material to be processed in the previous stage, a misgrip is checked, and if there is no material to be processed, the press continues to operate without checking.

(Effects of the Invention) The present invention provides a transfer press with multiple stages, in which there is a stage where a detector for confirming molds and materials is not installed, and even if the material to be processed is missing due to a misgrip, there is no material to be processed. The press operation, so-called intermittent operation or tooth extraction operation, can be continued by sequentially changing the state.

Therefore, in the present invention, it is possible to arbitrarily select a stage where no mold is installed, so molds can be arranged in a well-balanced manner for all stages, and the press can be operated without applying an unbalanced load to the press frame. Therefore, the life of the press can be extended.

[Brief explanation of drawings]

Figure 1 is a plan view showing the product conveyance section of the feed bar, Figure 2 is a front view of the operation panel, Figures 3 to 8 are electrical circuit diagrams that control this embodiment, and Figure 9 shows the operating state. This is a flowchart. NO1~NO5...Stage, PL1-PL5...
Display lamp, 1... Feed bar, 2... Finger, 3... Processing material, LS1 to LS5... Clamp confirmation switch, 4... Monitor switch, 5...
...Indication switch, RS1 to RS5...Rotary cam switch, RY1 to RY69...Relay, ry1
~ry69... contact.

Claims (1)

[Claims] 1. A plurality of stages are provided on which molds are installed, and the processed material processed by the molds installed on each stage is gripped by each finger provided on the feed bar and transferred to a subsequent mold. In transfer feed control, which is used to feed and sequentially process the material, a clamp confirmation switch for the material to be processed is provided on the finger corresponding to each stage where the mold is installed, and the grip of the material to be processed at the finger is checked using the switch. A material detection means for determining the presence or absence of processing material in the mold provided at each stage by the operation of a clamp confirmation switch provided on a finger corresponding to each stage, and information on the presence or absence of processing material at each stage in the material detection means. a first storage means for storing the information of each stage up to the process in the next stage; and when the first storage means stores that there is a material to be processed, the grip of the material to be processed is stored at a clamp confirmation switch in the next step; instructs to check the
A first judgment means that determines to continue operation even if the grip of the processing material is not checked by the clamp confirmation switch in the next process when the storage means remembers that there is no processing material; An instruction switch provided for each stage that indicates a stage where a mold and clamp confirmation switch is not installed, and information on the presence or absence of processed material from the material detection means of the stage immediately preceding the stage specified by the instruction switch. a second storage means that stores up to the process in the next stage of the stage instructed by , and when the second storage means memorizes that there is processing material, a clamp confirmation switch in the next next process. When the memory means stores that there is no material to be processed and the grip of the material to be processed is instructed to be checked, the operation is determined to continue even if the grip of the material to be processed is not checked by the clamp confirmation switch in the next step. 1. A transfer feed control device comprising: 2 determining means.