JP2008229663A - Multistep forging apparatus and multistep forging method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multistep forging apparatus suitable for suppressing the generation of forged articles with defects in the dimensional accuracy, and a multistep forging method. <P>SOLUTION: The multistep forging apparatus includes an automatic transportation device disposed with a plurality of forging dies 6A-6E opening or closing the dies in synchronization with a press machine 2 in the order of steps, and sequentially transporting a workpiece W to the forging dies 6A-6E in the subsequent steps. The apparatus sets the upper and lower limit values of a press load necessary for forging a part W to be produced, detects the press load for each press cycle by the press machine 2, determines whether the press load presents within an allowance range set by the upper and lower values of the set press load or not, allows the subsequent press cycle when the press load presents within the allowance value, and stops and/or alarms the press cycle when the press load beyond the allowance range is detected. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  In the present invention, multi-step forging dies are arranged in the order of crushing step, roughing step, finishing step, deburring step, etc., and workpieces are sequentially transferred between the forging dies by an automatic transfer device and pressed in multiple steps. The present invention relates to a multi-step forging device and a multi-step forging method for forming.

Conventionally, multiple forging dies are arranged in the order of crushing process, roughing process, finishing process, deburring process, etc., and workpieces are sequentially conveyed between the forging dies by an automatic conveying device and press-molded in multiple processes. Multi-step forging devices are known (see Patent Documents 1 to 3).
JP 2002-336929 A JP 2003-285131 A JP-A-10-29034

  By the way, in such a conventional multi-process forging device, an automatic conveyance device that sandwiches a workpiece by a pair of fingers and sequentially conveys it to the next process is generally equipped with a workpiece misgrip detection device. However, in hot forging and warm forging, where the temperature is high and water vapor and lubricant are scattered, a workpiece misgrip detection device can be installed in the automatic transport device, and each forging die can detect workpieces. May not be equipped with sensors.

  In this way, when a workpiece misgrip detection device or sensors cannot be equipped, there is a conveyance failure such that the workpiece is not grasped by the pair of fingers of the automatic conveyance device and the workpiece stays in the process or falls off in the middle. Even if it occurred, it could not be detected, and press molding was continued as it was, and there was a problem that production of molded products with poor dimensional accuracy occurred accidentally due to unbalanced tooth missing molding or double punching molding etc. .

  Then, this invention is made | formed in view of the said problem, and an object of this invention is to provide the multi-process forging apparatus and multi-process forging method suitable for generation | occurrence | production suppression of the molded product with inferior dimensional accuracy.

  The present invention comprises a plurality of forging dies that are opened and closed in synchronism by a press machine in the order of processes, and supplies workpieces to the forging dies in the first process, and the molded products obtained by the forging dies are as follows. In multi-process forging apparatus and multi-process forging method equipped with an automatic conveying device that sequentially conveys to the forging die of the process, it is necessary to form a load detection means for detecting a press load for each press cycle by the press machine, and to form a target part to be produced. Setting means for setting the upper limit value and lower limit value of the press load, and the allowable range in which the press load detected by the load detection means for each press cycle is set by the upper limit value and the lower limit value of the press load set by the setting means. If it is within the allowable range, the subsequent press cycle is allowed, and if a press load outside the allowable range is detected, the push cycle is detected. And a control means for the scan cycle stop and / or alarm, the.

  Therefore, in the present invention, a plurality of forging dies that are opened and closed in synchronism by a press machine are arranged in the order of processes, and a workpiece is supplied to the forging dies in the initial process and molded articles obtained by the forging dies. Is equipped with an automatic transport device that sequentially transports to the forging die in the next process, and sets the upper and lower limits of the press load necessary for molding the part to be produced, and detects the press load for each press cycle by the press machine. , It is determined whether the press load detected for each press cycle is within an allowable range set by the upper limit value and the lower limit value of the set press load. The press cycle is allowed, and when a press load outside the allowable range is detected, the press cycle is stopped and / or alarmed.

  For this reason, even if there is no workpiece misgrip device, it is possible to suppress the occurrence of defective products due to tooth missing molding and to prevent outflow to the downstream process. Also, even if a hot workpiece rolls into the press machine due to misgrip, etc., an abnormal alarm is issued and the press stops, so appropriate measures should be taken before a fire due to oil or grease or burning of the wiring in the press occurs. Can take. Moreover, even when a press load abnormality occurs (kamashi, two-piece work, etc.), an abnormality alarm is transmitted and the press is stopped, so that an appropriate measure can be taken by the operator before the damage is expanded.

  Hereinafter, the multi-step forging device and multi-step forging method of the present invention will be described based on each embodiment.

(First embodiment)
1 to 5 show a first embodiment of a multi-step forging device and multi-step forging method to which the present invention is applied, FIG. 1 is a system configuration diagram of the multi-step forging device, and FIG. 2 is a forging method using the multi-step forging device. FIG. 3 is a control flowchart for monitoring the forming load of the multi-process forging device, FIG. 4 is a characteristic diagram showing a change in forming load generated in the multi-process forging device, and FIG. It is.

  In FIG. 1, the multi-process forging device 1 is fixed to an unillustrated automatic conveying device, a lower die holder 4 fixed on a bed 3 </ b> A constituting a part of a frame 3 of the press machine 2, and a slide (not illustrated) of the press machine 2. For example, forging dies 6A to 6E are arranged in the order of a crushing process, a roughing process, a rough forming process, a finishing process, and a deburring process. The forging dies 6A to 6E are fixed to the die holders 4 and 5 with a sub die holder 7 interposed therebetween.

  Although not shown in the drawing, the automatic transfer device includes transfer feed bars that are driven in three dimensions by actuators on both sides of each of the forging dies 6A to 6E, and each transfer feed bar corresponds to each of the forging dies 6A to 6E. A pair of left and right fingers are respectively arranged. The pair of left and right fingers are gripped from both sides while the forging dies 6A to 6E in each step are opened by the press machine 2 and the one-step forging is performed as indicated by arrows. Transport / injection into mold 6A, 1-step forging die 6A → 2-step forging die 6B, 2 → 3, 3 → 4, 4 → 5, forging dies 6B to 6E, extraction / conveyance / injection, and 5 steps It is configured so that the forging die 6 </ b> E is sequentially extracted and conveyed, and conveyed to the next step between the forging dies 6 </ b> A to 6 </ b> E.

  During the press molding operation in which the press machine 2 closes the mold, the transfer feed bar of the automatic transport device is retracted to the standby position so that the operations of the press machine 2 and the automatic transport device do not interfere with each other. While the press machine 2 opens the mold, the transfer feed bar of the automatic transfer device is advanced from the standby position to the operating position, and the workpieces pressed in the previous process are each gripped and transferred to the forging dies 6A to 6E in the next process. It is controlled by the controller 8 so as to be put in.

  The controller 8 also monitors the press load detected by a load sensor 9 (load cell, strain gauge, etc.) installed on the frame 3 of the press machine 2 for each press cycle, and the detected press load corresponds to the workpiece. If it is determined that the forging process of the executed press cycle has been executed normally and whether the forging process of the press cycle has not been executed normally. The press machine 2 and the automatic transfer device are stopped, and the alarm device 10 is operated to send an abnormality alarm.

  For example, as shown in FIGS. 2 (A) to (E), the press cycle includes three steps (1 · 3 · 5) in which the workpiece W is formed by a 1 · 3 · 5 step forging die (6A, 6C, 6E). ) Forming (FIGS. 2 (A), (C), (E)) and the work W obtained by this three-step (1/3/5) forming by the automatic transfer device to the next step (2, 4 steps, 5 steps) 2 steps (2/4) forming (FIG. 2 (B)), in which the workpiece W is formed by a 2/4 step forging die (6B, 6D) which is carried and carried to a forging device). (D))) is repeated alternately, so-called “one skip molding” is executed. In addition, after the 2 steps (2.4), each workpiece is transferred to the next step (3, 5 steps) by an automatic transfer device, and a new workpiece is supplied to 1 step, and then the 3 steps (1. 3.5) Molding is performed.

  Thus, in the press cycle of “one skipping molding” in which the three-step (1 · 3 · 5) molding and the two-step (2 · 4) molding are alternately repeated, workpieces are present in all forging dies 6A to 6E. Compared with the all-round forming, the press load of the press machine 2 is reduced, the frequency of use of each of the forging dies 6A to 6E is reduced by half, its durability is maintained, and its life is improved.

  FIG. 3 shows a flowchart of press load monitoring executed by the controller 8 for each press cycle. The controller 8 preliminarily includes an upper limit value Pmax and a lower limit value Pmin of the press load including the press load at the time of normal three-step (1/3/5) molding and the press load at the time of two-step (2/4) molding. And are set and stored. The press load is detected for each press cycle by a load sensor 9 installed on the frame 3 of the press machine 2.

  The flowchart shown in FIG. 3 determines whether or not the press operation by the press machine 2 is started and the workpieces are sequentially supplied to shift to the normal operation in Step 2, and the step is performed when it is determined that the normal operation is transferred. The press load monitoring routine after 3 is set to start. Based on the flowchart of FIG. 3, press weight monitoring control will be described below.

  First, the press machine 2 is actuated to start a slider vertical movement cycle, the upper die holder 5 and the upper mold 6 are moved up and down, and mold closing and mold opening are alternately repeated to start the press operation. Next, in step 1, a preset press load allowable range is read. This press load allowable range is set and stored in the controller 8 in accordance with the workpiece W to be press formed. Then, the workpieces W are sequentially supplied to the forging die 6A of one step at a rate of one piece every other cycle, and the molding of one step is started by the subsequent mold closing.

  In this case, since the press load is formed by only the one-step forging die 6A, the preset monitoring start load is not reached, and therefore the determination in step 2 is determined as NO. In the next mold opening, the workpiece of the one-step forging die 6A is transferred to the two-step forging die 6B by the automatic transfer device, and the press cycle by the next die closing is started.

  Since the press load in this press cycle is the molding with only the two-step forging die 6B, it does not reach the preset monitoring start load, so the determination in step 2 is determined as NO. At the next mold opening, the workpiece of the two-step forging die 6B is transferred to the three-step forging die 6C by the automatic transfer device and is put into the one-step forging die 6A, and the press cycle by the next die closing is performed. Be started. Since the press load in this press cycle is formed by the 1 / 3-step forging dies 6A and 6C, the determination in step 2 is set as YES when the preset monitoring load is reached, and the press load monitoring in steps 3 and 4 is performed. Go to the state.

  Subsequently, the workpiece W of the one-step forging die 6A is conveyed and fed into the two-step forging die 6B and the workpiece W of the three-step forging die 6C is conveyed and fed into the four-step forging die 6D by the automatic conveyance device by the automatic mold opening. The press cycle by closing is started. This press cycle is a two-step (2/4) molding. In step 4, it is determined whether or not the resulting press load is within the range of the upper limit value Pmax to the lower limit value Pmin of the press load. If it is within, press operation is continued.

  At the next mold opening, a new workpiece W is put into the one-step forging die 6A by the automatic transfer device, the workpiece W of the two-step forging die 6B is transferred to the three-step forging die 6C, and the workpiece W of the four-step forging die 6D. Is fed into the 5-step forging die 6E, and the press cycle by the next die closing is started. This press cycle is a three-step (1/3/5) molding, and in step 4, it is determined whether or not the press load is within the range of the upper limit value Pmax to the lower limit value Pmin of the press load. If it is within, press operation is continued.

  In the subsequent press cycle, when the press load is in the range of the upper limit value Pmax to the lower limit value Pmin, the two-step (2/4) molding and the three-step (1/3/5) molding are alternately repeated. It is.

  FIG. 4 is a time chart showing temporal changes in the press load for each press cycle. The press load is generated lower in the two-step (2 · 4) molding and higher in the three-step (1 · 3 · 5) molding. The press load is also raised and lowered alternately by repeating the two-step (2 · 4) molding and the three-step (1 · 3 · 5) molding alternately.

  By the way, the automatic transfer device is used in an adverse environment where the temperature is high and water vapor is scattered, oil smoke is generated, and the lubricating oil material is scattered as in hot and warm forging. W miss grip detection device is not equipped. Therefore, even if a misgrip of the workpiece W occurs in any of the fingers, it cannot be detected. Specifically, the workpiece W formed by any of the forging dies 6A to 6E cannot be pulled out and cannot be extracted, or the workpiece W extracted from the previous process forging dies 6A to 6D is dropped during conveyance, or the next process forging. It cannot be detected even if a failure occurs in which the molds 6B to 6E cannot be normally inserted. Here, for example, a case where the workpiece W in the middle of conveyance by the automatic conveyance device has dropped out and the workpiece (material) has not been introduced into the one-step forging die 6A only once will be considered below.

  FIGS. 5A to 5E show a press cycle when the above situation occurs. FIGS. 5A and 5B show normal three-step (1/3/5) molding followed by normal two-step (2/4) molding. When the workpiece W input to 6A fails, as shown in FIG. 5C, the workpiece W does not exist in the one-step forging die 6A, and the tooth is removed only by the 3 / 5-step forging dies 6C and 6E. The press load is reduced as shown in the press load P1 of FIG. 4 in comparison with the normal three-step (1, 3, 5) molding.

  Conventionally, since the state shown in FIG. 5C cannot be discriminated, the press operation is continued, and the automatic mold transfer device conveys the workpiece W of the three-step forging die 6C to the four-step forging die 6D and 5 The workpiece W of the process forging die 6E is carried out of the multi-process forging device 1, and in the subsequent press cycle, as shown in FIG. . The press load in this case is also greatly reduced as compared with the normal three-step (1, 3, 5) molding (press load P2 in FIG. 4). By the next mold opening, the automatic conveyance device conveys the workpiece W of the four-step forging die 6D to the five-step forging die 6E and inputs the workpiece W to the one-step forging die 6A. In the subsequent press cycle, FIG. As shown in FIG. 4B, the press-free forming is performed only by the 1-5 step forging dies 6A and 6E. In this case, the press load is the lowest P3.

  Then, in the press cycle following FIG. 5 (E), as shown in FIG. 5 (F), a tooth missing state in which the workpiece W exists only in the two-step forging die 6B occurs, and the press load at that time point P4 becomes the lowest state, and in the next cycle, as shown in FIG. 5 (G), the workpiece W is present only in the first and third process forging dies 6A and 6C, respectively. Even in the workpiece W, the dimensional defect occurs.

  In this way, the forged molded product W obtained through the press loads P1 to P5 is formed in three steps (1 · 3 · 5) and two steps (1 · 3 · 5) in which the press load is uniformly input to the forging dies 6A, 6C, and 6E. 2.4) Not a molding, but a tooth balance molding with a poor balance. Since the press load is concentrated on a specific forging die, there arises a problem that the occurrence of a defective product dimension is accidental.

  However, in the present embodiment, the determination in Step 4 is normal because the press load P1 is below the lower limit Pmin of the press load at the stage of the press cycle in FIG. It is determined that the press load range has been exceeded, and the process proceeds to step 5, where the press machine 2 is stopped at the stage of the press cycle, and an abnormal alarm is transmitted.

  For this reason, generation | occurrence | production of the dimension defect goods by workpiece | work tooth missing and the outflow to the post process of a dimension defect product can be prevented. Moreover, even if the workpiece W heated hot to warm is rolled into the multistage forging device 1 due to misgrip or the like, an abnormal alarm is issued and the press machine 2 is stopped. Appropriate measures can be taken before burnout of the wiring or the like occurs.

  In addition, the operation in the case where the workpiece W formed by any of the forging dies 6A to 6E cannot be pulled out by the automatic transfer device and cannot be extracted or cannot be normally put into the next forging dies 6B to 6E will be described below. explain. In addition, when the workpiece W formed by any of the forging dies 6A to 6E is missed by the automatic conveying device and cannot be extracted, the knockout device of the forging die generates a malfunction and the workpiece W remains in the forging die. Caused by. In this situation, the next workpiece W that has been transported after two cycles is further thrown into the forging die, and “two workpieces punching” occurs in which the two workpieces W are formed with the same forging die.

  In this two-piece work, it is natural that a defective product dimension is generated, but as shown in FIG. 4, the press load P10 is greatly increased from the normal range, which is a criterion in Step 4. The upper limit value Pmax of the press load is greatly exceeded, and an abnormal alarm is transmitted in step 5 to stop the press machine. For this reason, the press load due to the continued press cycle is increased abnormally and can be safely stopped without waiting for a sudden stop due to the overload of the press machine 2, and abnormalities in the forging dies 6A to 6E can be prevented. Appropriate measures can be taken before the forging dies 6A to 6E are damaged by the load input.

  In addition, when the next process forging dies 6A to 6E cannot be normally input, the input work W is not normally stored in the forging dies 6A to 6E due to a defect of work locating by the finger of the automatic transfer device. It is to be in a state that is not. In such a case, the workpiece W is subjected to abnormal forming such as slanting by the forging dies 6A to 6E, and naturally a defective product with dimensional accuracy is completed. Even in this case, the press load generates a high press load close to the above-described two-piece work. For this reason, it is determined that the determination in step 4 has exceeded the upper limit value Pmax of the press load, an abnormality alarm is issued in step 5 and the press machine 2 is stopped. Therefore, the press load due to the continued press cycle is increased abnormally, and can be safely stopped without waiting for a sudden stop due to the overload of the press machine 2, and the abnormal load on the forging dies 6A to 6E Appropriate measures can be taken before the forging dies 6A to 6E are broken by the input.

  In the above embodiment, the work W is supplied to the multi-step forging device 1 every other press cycle to perform the three-step (1/3/5) forming and the two-step (2/4) forming. Although what is provided with the press cycle of "one skip forming" which repeats alternately was demonstrated, although not shown in figure, the workpiece | work W is supplied in all the press cycles, the workpiece | work W exists in all the forging dies 6A-6E, and all You may apply to the multistep forging apparatus 1 to shape | mold.

  Moreover, in the said embodiment, as the multi-step forging device 1, for example, a five-step forging die provided with forging dies 6A to 6E arranged in the order of a crushing step, a roughing step, a rough forming step, a finishing step, and a deburring step Although what was provided with 6A-6E was demonstrated, although not shown in figure, you may apply to the multistep forging apparatus of 4 processes or 3 processes.

  In the present embodiment, the following effects can be achieved.

  (A) A plurality of forging dies 6A to 6E that are opened and closed in synchronization by the press machine 2 are arranged in the order of processes, and the workpiece W is supplied to the forging die 6A in the first step and each forging die 6A to 6A is provided. An automatic conveying device for sequentially conveying the molded product obtained in 6E to the next forging dies 6A to 6E, and setting the upper limit value and the lower limit value of the press load necessary for forming the target part W to be produced; 2 is detected for each press cycle, and it is determined whether the press load detected for each press cycle is within an allowable range set by the upper limit value and the lower limit value of the set press load. When it is within the allowable range, the subsequent press cycle is allowed, and when a press load outside the allowable range is detected, the press cycle is stopped and / or alarmed.

  For this reason, even if there is no mis-grip device for the workpiece W, it is possible to suppress the generation of defective dimensions due to the missing tooth forming and to prevent the outflow to the downstream process. In addition, even if the heated workpiece W rolls into the press machine 2 due to a misgrip or the like, an abnormal alarm is issued and the press stops, so before the fire due to oil or grease or burning of the wiring in the press machine 2 occurs. Can take appropriate action. Moreover, even when a press load abnormality occurs (kamashi, two-piece work, etc.), an abnormality alarm is transmitted and the press is stopped, so that an appropriate measure can be taken by the operator before the damage is expanded.

(Second Embodiment)
6 and 7 show a second embodiment of a multi-step forging apparatus and multi-step forging method to which the present invention is applied, FIG. 6 is a flowchart of press load monitoring executed by a controller for each press cycle, and FIG. 6 is a time chart showing temporal changes in press load for each press cycle in control No. 6; In the present embodiment, a press load monitoring control method corresponding to two types of press loads is added to the first embodiment so as to be suitable for a multi-process forging apparatus that supplies workpieces every other cycle. The same devices as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified.

  The multi-step forging device 1 of the present embodiment is different from the first embodiment only in the control flowchart of the press load monitoring executed by the controller 8, and the other configurations are the same as those in the first embodiment. Yes. In the press load monitoring of this embodiment, as shown in FIG. 7, the press load allowable range A in the two-step (2.4) molding (two-shot) and the three-step (1/3/5) molding (three). Focusing on the fact that the allowable press load range B is different, the monitored press load range is made different.

  That is, as shown in FIG. 6, the flowchart of the press load monitoring of this embodiment is shown in FIG. 6. In step 10, the press load allowable range A in the two-step (2/4) molding (two-shot) and the three steps (1/3) -5) Read the press load allowable range B in molding (three-shot).

  Next, similarly to step 2 in the first embodiment, in step 11, it is determined whether or not the press operation has shifted to the normal operation, and at the stage of shifting to the normal operation, the press load monitoring in steps 12 to 14 is performed. The routine is moved to.

  That is, in step 12, it is determined whether or not the number of press cycles to be executed is three, and if it is three, the process proceeds to step 13, and if it is two, the process proceeds to step 14.

  In Step 13, it is determined whether or not the detected press load is within the three-press press load range B read in Step 10, and in Step 14, the detected press load is read in Step 10 It is determined whether or not it is within the press load range A.

  In step 13 and step 14, if the detected press load is within the allowable range (A or B) of the set press load, the process returns to step 12 and the subsequent press cycles are sequentially repeated. If it is determined on either side of step 13 or step 14 that the load is outside the allowable range, the process proceeds to step 15 where the press machine 2 is stopped and an abnormality alarm is transmitted.

  As described above, according to the present embodiment, the tolerance range between the two-shot and the three-shot is different, so that a defective product due to a missing tooth or an outflow to a subsequent process of the defective product. Can be prevented. Moreover, even if the workpiece W heated between hot and warm rolls into the multistage forging device 1 due to misgrip or the like, an abnormal alarm is transmitted and the press machine 2 is stopped. Appropriate measures can be taken before burnout of the internal wiring or the like occurs.

  Further, even in the case of two workpieces W or when the next process forging dies 6 </ b> A to 6 </ b> E cannot be normally inserted, an abnormality alarm is transmitted in step 15 and the press machine 2 is stopped. Therefore, the press load due to the continued press cycle is increased abnormally, and can be safely stopped without waiting for a sudden stop due to the overload of the press machine 2, and the abnormal load on the forging dies 6A to 6E Appropriate measures can be taken before the forging dies 6A to 6E are broken by the input.

  In addition, when determining the press load, the tolerance range between the two-punch and three-punch cases is made different, so that finer determination can be performed compared to the first embodiment, and reliability is improved. It is possible to execute the generation determination of a defective product with a high dimension.

  In the present embodiment, in addition to the effect (a) in the first embodiment, the following effects can be achieved.

  (A) The automatic conveying apparatus supplies the workpiece W to the forging die 6A in the first process every other press cycle, and the plurality of forging dies 6A to 6E are conveyed so that one workpiece W is present and set. The controller 8 can be set with an upper limit value and a lower limit value of a plurality of press loads corresponding to the work arrangement state (1/3/5 process or 2.4 process) for the plurality of forging dies 6A to 6E. The controller 8 as the control means is an upper limit value of the press load corresponding to the arrangement state (1/3/5 process or 2/4 process) of the workpieces W among the set press loads for each press cycle. And if it is within the allowable range set by the lower limit value, if it is within the allowable range, the subsequent press cycle is allowed, and when a press load outside the allowable range is detected. Is Les cycle arrest and / or by alarm, as compared to the first embodiment can finer judgment at the grain, it is possible to perform the generation determination reliable dimensions defective.

(Third embodiment)
8 and 9 show a third embodiment of the multi-process forging apparatus and multi-process forging method to which the present invention is applied, FIG. 8 is a flowchart of press load monitoring executed by the controller for each press cycle, and FIG. 8 is a time chart showing temporal changes in press load for each press cycle in control No. 8; In the present embodiment, a press load monitoring control method focusing on changes in the press load is added to the first embodiment so as to be suitable for a multi-step forging apparatus that supplies workpieces every other cycle. In addition, the same code | symbol is attached | subjected to the same apparatus as 1st, 2 embodiment, and the description is abbreviate | omitted or simplified.

  The multi-step forging device 1 of the present embodiment is different from the first embodiment only in the control flowchart of the press load monitoring executed by the controller 8, and the other configurations are the same as those in the first embodiment. Yes.

  In the press load monitoring of this embodiment, as shown in FIG. 9, relatively low press load and three-step (1/3/5) molding (three pieces) in two-step (two-four) molding (two-shot). Focusing on the fact that a relatively high press load is generated alternately in the striking), the change in the press load that occurs alternately is monitored. Therefore, when the two-press press load generated after three strikes is reduced, it is determined that the press cycle is normal, and when the press load is increased as shown in P10 in the figure, the press cycle is determined to be abnormal. . Further, when the three-punch press load generated after the two-punch is increased, it is determined as a normal press cycle, and when the press load is decreased as indicated by P11 in the figure, the press cycle is determined as abnormal. .

  Further, as in the first embodiment, it is determined whether the press load has a preset allowable load range including two-shot and three-shot, and the executed press cycle is executed with an abnormal load. I try to confirm that it is not a thing.

  That is, the press load monitoring flowchart of this embodiment reads a preset press load allowable range in step 20 as shown in FIG. Next, similarly to step 2 in the first embodiment, in step 21, it is determined whether or not the press operation has shifted to the normal operation. When the press operation has shifted to the normal operation, the press load monitoring in steps 22 to 25 is performed. The routine is moved to.

  In step 22, it is determined whether or not the detected press load is within a preset allowable range. If it is within the allowable range, the process proceeds to step 23. If it is out of the allowable range, the press cycle is executed with an abnormal press load. If it is determined that the operation has been performed, the process proceeds to step 26, where the press machine is stopped and an abnormality alarm is transmitted. Therefore, prevention of outflow of defective products with dimensional accuracy based on a press cycle executed with an abnormally low press load or an abnormally high press load to the subsequent process, and appropriate countermeasures for the cause of the abnormal press load being executed it can.

  In step 23, it is determined whether or not the number of press cycles to be executed is three, and if it is three, the process proceeds to step 24. If it is two, the process proceeds to step 25.

  In step 24, it is determined whether or not the press load in the press cycle executed this time is increased with respect to the press load of the press cycle executed last time. If the load is increased, the process returns to step 22 in order. The press cycle is repeated, but if the detected press load is decreasing, the process proceeds to step 26, where the press machine 2 is stopped and an abnormal alarm is transmitted.

  In step 25, it is determined whether or not the press load in the press cycle executed this time has been reduced with respect to the press load in the press cycle executed last time. The subsequent press cycle is repeated, but if the detected press load is increased, the process proceeds to step 26, where the press machine 2 is stopped and an abnormality alarm is transmitted.

  As described above, in the present embodiment, it is determined whether or not the increase or decrease in the press load is normally performed, thereby preventing the occurrence of a defective dimension due to the missing workpiece or the outflow to the subsequent process of the defective dimension. can do. Moreover, even if the workpiece W heated between hot and warm rolls into the multistage forging device 1 due to misgrip or the like, an abnormal alarm is issued and the press machine 2 is stopped. Appropriate measures can be taken before burnout of wiring or the like occurs.

  Further, even in the case of two workpieces W or when the next process forging dies 6 </ b> A to 6 </ b> E cannot be normally inserted, an abnormality alarm is transmitted at step 22 and the press machine 2 is stopped. Therefore, the press load due to the continued press cycle is increased abnormally, and can be safely stopped without waiting for a sudden stop due to the overload of the press machine 2, and the abnormal load on the forging dies 6A to 6E Appropriate measures can be taken before the forging dies 6A to 6E are broken by the input.

  In addition, when determining the press load, the increase and decrease of the press load is monitored by paying attention to the fact that the double strike and the triple strike are alternately repeated, compared with the first embodiment. This makes it possible to carry out finer determination of grain and to perform determination of a defective product with high reliability.

  In the present embodiment, in addition to the effect (a) in the first embodiment, the following effects can be achieved.

  (C) The automatic transfer device supplies the work to the forging die 6A in the first step every other press cycle, and a plurality of forging dies 6A to 6E include one workpiece W and a plurality of forging dies 6A to 6A to 6E. The workpiece 8 is conveyed so that the workpiece arrangement state (1 · 3 · 5 step or 2 · 4 step) with respect to 6E changes for each press cycle, and the controller 8 as the control means is arranged with the workpiece W arrangement state (1 · 3) for each press cycle. (5) or (2-4)), it is determined whether or not the press load of the current press cycle has been increased or decreased with respect to the press load in the previous press cycle. If it is based on the arrangement state (1 · 3 · 5 step or 2 · 4 step), the subsequent press cycle is allowed, and the increase / decrease change of the press load is the arrangement state of the workpiece W If it is not based, the press cycle is stopped and / or alarmed, that is, the increase or decrease of the press load is monitored by paying attention to the fact that the two-stroke and the three-stroke are repeated alternately. As a result, it is possible to perform finer determination than in the first embodiment, and it is possible to execute determination of a defective dimension with high reliability.

The system block diagram of the multi-process forging apparatus which shows one Embodiment of this invention. Explanatory drawing which similarly shows the forging method by a multi-process forging apparatus. The control flowchart of forming load monitoring of a multi-process forging device. The characteristic view which shows the change of the molding load which generate | occur | produces in a multi-process forging apparatus. Explanatory drawing which shows an idling state. The flowchart of the press load monitoring performed with a controller for every press cycle of the multi-process forging apparatus which shows 2nd Embodiment of this invention. The time chart which showed the time change of the press load for every press cycle in control of FIG. The flowchart of the press load monitoring performed with a controller for every press cycle of the multi-process forging apparatus which shows 3rd Embodiment of this invention. The time chart which showed the time change of the press load for every press cycle in control of FIG.

Explanation of symbols

W Work 1 Multi-process forging device 2 Press machine 3 Frame 4 Lower die holder 5 Upper die holder 6A to 6E Forging die 7 Sub die holder 8 Controller 9 Load sensor 10 Alarm

Claims (8)

A plurality of forging dies that are opened and closed in synchronization by a press machine are arranged in the order of processes, and workpieces are supplied to the forging dies in the first process and the products obtained in each forging dies are forged dies in the next process. In a multi-process forging device equipped with an automatic conveying device that sequentially conveys
Load detecting means for detecting a press load for each press cycle by the press machine;
A setting means for setting an upper limit value and a lower limit value of a press load necessary for forming a target part to be produced;
It is determined whether the press load detected by the load detecting means for each press cycle is within the allowable range set by the upper limit value and the lower limit value of the press load set by the setting means, and is within the allowable range. A multi-step forging apparatus comprising: a control means for allowing a subsequent press cycle in case and stopping and / or alarming the press cycle when a press load outside the allowable range is detected. The automatic conveying device supplies the work to the forging die of the first process every other press cycle, and is conveyed so that the work is present in one of the plurality of forging dies,
The setting means can set an upper limit value and a lower limit value of a plurality of press loads corresponding to the work arrangement state for a plurality of forging dies,
Whether the control means exists within an allowable range set by the upper limit value and the lower limit value of the press load corresponding to the workpiece arrangement state among the plurality of press loads set by the setting means for each press cycle. If it is within the allowable range, a subsequent press cycle is allowed, and if a press load outside the allowable range is detected, the press cycle is stopped and / or alarmed. The multi-step forging device according to claim 1. The plurality of forging dies are arranged in the order of five steps,
The setting means includes an upper limit value and a lower limit value of the breath load when the work is arranged in the forging die of the first, third and fifth steps, and an upper limit value of the breath load when the work is arranged in the forging die of the second and fourth steps. And lower limit value can be set,
The control means determines whether it exists within an allowable range set by an upper limit value and a lower limit value of a press load corresponding to the work arrangement state set by the setting means for each press cycle, and the allowable The press cycle is allowed if it is within the range, and if a press load outside the allowable range is detected, the press cycle is stopped and / or alarmed. Process forging device. The automatic conveying apparatus supplies a work to the forging die in the first process every other press cycle, and a plurality of forging dies have one work to be skipped and the work arrangement state with respect to the plurality of forging dies is changed every press cycle. Transport to change,
The control means determines whether or not the press load of the current press cycle is increased or decreased with respect to the press load in the previous press cycle based on the work arrangement state for each press cycle, and increases or decreases the press load. If the change is based on the arrangement state of the workpiece, the subsequent press cycle is allowed. If the change in the press load is not based on the arrangement state of the workpiece, the press cycle is stopped and / or alarmed. The multi-process forging device according to claim 1. The plurality of forging dies are arranged in the order of five steps, and the workpiece is arranged in a forging die of 1, 3, 5 steps for each press cycle, and the workpiece is arranged in a forging die of 2.4 steps. Are configured to appear alternately,
In the control means, when the work is arranged in a forging die of 1, 3, 5 processes for each press cycle, the press load is increased from the previous press load, and the work is processed in 2-4 processes. If the press load is reduced from the previous press load, the subsequent press cycle is allowed when the press load is arranged in the forging mold, and the press cycle is changed when the press load deviates from the above. The multi-step forging device according to claim 4, wherein the multi-step forging device is stopped and / or alarmed. A plurality of forging dies that are opened and closed in synchronization by a press machine are arranged in the order of processes, and workpieces are supplied to the forging dies in the first process and the products obtained in each forging dies are forged dies in the next process. In a multi-step forging method comprising an automatic transfer device that sequentially transfers
Set the upper limit and lower limit of the press load necessary for molding the target part to be produced,
Detecting the press load for each press cycle by the press machine,
It is determined whether or not the press load detected for each press cycle is within the allowable range set by the upper limit value and the lower limit value of the set press load. A multi-step forging method characterized in that a cycle is allowed and a press cycle is stopped and / or alarmed when a press load outside the allowable range is detected. The automatic conveying device supplies the work to the forging die in the first process every other press cycle, and conveys the work so that one workpiece is present in a plurality of forging dies,
Set an upper limit value and a lower limit value of a plurality of press loads corresponding to the workpiece arrangement state for the plurality of forging dies,
It is determined whether or not there is a detected press load within the allowable range of the upper limit value and the lower limit value of the press load set corresponding to the arrangement state of the workpieces for each press cycle, and is within the allowable range. 7. The multi-step forging method according to claim 6, wherein a subsequent press cycle is allowed, and a press cycle is stopped and / or alarmed when a press load outside the allowable range is detected. The automatic conveying apparatus supplies a work to the forging die in the first process every other press cycle, and a plurality of forging dies have one work to be skipped and the work arrangement state with respect to the plurality of forging dies is changed every press cycle. Transport to change,
It is determined whether the press load of the current press cycle has been increased or decreased with respect to the press load in the previous press cycle based on the work arrangement state for each press cycle. When it is based on the arrangement state, the subsequent press cycle is allowed, and when the increase / decrease change of the press load is not based on the arrangement state of the workpiece, the press cycle is stopped and / or alarmed. The multi-step forging method according to claim 6.