JP2004136337A - Work transporting device, work transporting method, multistage type forging press machine, and shaft of rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a work transporting device, in which even if a plurality of chuck parts are provided, missing for the chucks can surely be detected with a simple constitution. <P>SOLUTION: The work transporting device is provided with a plurality of chuck parts 11a to 11d of clamping electroconductive works, a reciprocating apparatus 12 of reciprocating the chuck parts, a work clamping detection part 16c of detecting the fact that the respective chuck parts 11a to 11d clamp each work W or not. The work clamping detection part 16c can detect the fact that the plurality of chuck parts 11a to 11d clamp each work W or not by the fact that energizing is performed or not in a series circuit A formed by fingers 17a and 17b respectively provided at the plurality of chuck parts 11a to 11d, and the work W clamped by the fingers 17a and 17b. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a work transfer device, a work transfer method, a multi-stage forging press, and an improvement of a shaft of a rotating electric machine.
[0002]
[Prior art]
FIG. 12 is an explanatory diagram showing a schematic configuration of a conventional multi-stage forging press. The conventional multi-stage forging press 401 shown in FIG. 1 is for forging a work W into a predetermined shape, and has a plurality of forging steps from a first step to a fifth step.
[0003]
In each of the first to fifth steps, a press die 430a to a press die 430e are provided, and the work W is gradually finished to the final shape by sequentially passing through the press die in each step. It has become.
[0004]
Reference numeral 410 in FIG. 12 denotes a work transfer device for transferring the work W to the press die in the next process in the multi-stage forging press 401 including the plurality of forging processes.
[0005]
The work transfer device 410 includes chuck portions 411a to 411e for reciprocating between the respective steps and actually transferring the work W, and a reciprocating motion for reciprocating the chuck portions 411a to 411e. An apparatus (not shown), a discharge conveyor 414 for discharging the transported work W to the outside of the apparatus, and a control device (not shown) for controlling these operations are provided.
[0006]
In the work transfer device 410 having the above-described configuration, the work W is transferred to the next process while being held by the chuck portions 411a to 411e.
[0007]
However, during the work transfer process of the work transfer device 410, a so-called chuck error may occur in which any of the chuck units 411a to 411e cannot grip the work W.
[0008]
As described above, if a chuck error occurs in the work transfer process, the work W may be left in the press die. In the work transfer device 410 shown in FIG. 12, as an example showing a state in which a chuck error has occurred, the chuck unit 411c cannot grip the work W and shifts from the press die 430c in the third step to the press die 430d in the fourth step. Has been done.
[0009]
Therefore, of the press dies 430a to 430e arranged in each of the first to fifth steps, the work W is left in the press die 430c in the third step.
[0010]
Then, if the work W conveyed from the press die 430b in the second step by the chuck portion 411b is set in the press die 430c in the third step while the work W is left in the press die 430c in the third step. In other words, the so-called "double punch" in which two works W are simultaneously processed by the same press die 430c occurs.
[0011]
As described above, when “double hit” occurs in the press die 430c, the press die 430c may be damaged, and it may take a long time to maintain the press die 430c in centering correction or the like. This causes a reduction in the operating rate of the forging press 401.
[0012]
Therefore, in order to prevent the occurrence of "double hit" in the press die as described above, a work detector for detecting whether or not the work is held normally is provided at each chuck portion. (For example, see Patent Documents 1 and 2).
[0013]
That is, in the work transfer device described in Patent Literature 1, a work detector that can mechanically contact a work is provided in each chuck unit, and a chuck error is determined based on the presence or absence of a detection signal from the work detector. It has become.
[0014]
Further, in the work transfer device described in Patent Literature 2, an electric circuit for flowing a current between the fingers for gripping the work is provided in each of the chuck portions. A chuck error is determined based on a detection signal output from an electric circuit.
[0015]
[Patent Document 1]
JP-A-8-90109 (page 3, FIG. 2, FIG. 3)
[Patent Document 2]
JP-A-2000-94070 (pages 3-5, FIGS. 1, 4, and 7)
[0016]
[Problems to be solved by the invention]
However, when a work detector or an electric circuit is provided in each of the plurality of chucks as in the above-described work transfer device, the structure of the chucks becomes complicated, and the number of parts increases, resulting in an increase in cost. is there.
[0017]
The present invention has been made in view of the above-described problems, and has as its object to reduce the number of parts as compared with the related art even when detecting a gripping state of a work in a plurality of chuck portions, and to reduce cost. It is an object of the present invention to provide a work transfer device capable of suppressing the temperature of a workpiece.
[0018]
Another object of the present invention is to provide a work transfer device capable of preventing the work transfer from being continued in a state where the work is dropped, and improving the work transfer efficiency.
[0019]
Another object of the present invention is to provide a work transfer method that can prevent the work transfer from continuing in a state where the work is dropped, and can improve the transfer efficiency of the work.
[0020]
Another object of the present invention is to provide a multi-stage forging press capable of preventing the occurrence of so-called "double punching" in which two works are simultaneously processed by the same press die and improving the operation rate. The machine.
[0021]
Another object of the present invention is to provide a shaft of a rotating electric machine that can reduce the manufacturing cost as compared with the related art.
[0022]
[Means for Solving the Problems]
According to the above object, according to the work transfer device of claim 1, a plurality of chucks for gripping the conductive work, a moving unit for moving the plurality of chucks, and each of the plurality of chucks are provided. A workpiece gripping detector that detects whether or not the workpiece is gripped, wherein the plurality of chucks include an anode-side conductive contact member and a cathode-side conductive member that contact the workpiece. And the anode-side conductive contact member of one of the chuck portions is electrically connected in series with the cathode-side conductive contact member of the other chuck portion. The work grip detection unit is configured to detect the plurality of chucks based on whether or not power is supplied to a series circuit formed by the anode-side conductive contact member, the cathode-side conductive contact member, and the work. That each section is detectably configure whether or not gripping the workpiece is solved by.
[0023]
As described above, the plurality of chuck portions are provided with the anode-side conductive contact member and the cathode-side conductive contact member that are in contact with the work, respectively, and among the plurality of chuck portions, the anode-side conductive contact member of one chuck portion is provided. The contact member is electrically connected in series with the cathode-side conductive contact member of the other chuck portion, and the workpiece gripping detection unit has an anode-side conductive contact member and a cathode-side conductive contact member, By detecting whether or not each of the plurality of chuck portions is gripping the work by detecting whether or not the work is energized in the series circuit formed by the work, it is only necessary to detect whether or not the energization is performed in the series circuit. Therefore, it is possible to detect that the workpiece has fallen out of any of the plurality of chuck portions, so that it is not necessary to provide a plurality of detectors and the like, and it is possible to reliably detect chuck errors with a simple configuration. It can become.
[0024]
As a result, even when detecting the gripping state of the work in the plurality of chuck portions, the number of components can be reduced as compared with the conventional case, and the cost can be reduced.
[0025]
At this time, in the work transfer device according to the first aspect, as in the work transfer device according to the second aspect, the moving unit may be configured such that each of the plurality of chuck units grips the work by the work grip detection unit. If a plurality of chucks are configured to be moved when is detected, the workpiece is not conveyed when the workpiece is not gripped by any of the plurality of chucks. This is preferable because it is possible to prevent the workpiece from being continued to be transported in a state where the workpiece has been dropped from the unit, and it is possible to improve the workpiece transport efficiency.
[0026]
Further, like the work transfer device according to claim 3, in the work transfer device according to claim 1, the anode-side conductive contact member and the cathode-side conductive contact member are configured to be able to grip the work. With such a configuration, it is possible to adopt a configuration having both the function of gripping the work and the function of detecting the presence / absence of gripping of the work in the chuck portion, so that the chuck portion can have a simple configuration, which is preferable. .
[0027]
Further, as in the work transfer device according to claim 4, in the work transfer device according to claim 1, between the anode-side conductive contact member and the cathode-side conductive contact member in the plurality of chuck portions. When the insulating members are provided, the anode-side conductive contact member and the cathode-side conductive contact member can be reliably insulated from each other. It is possible to improve the detection accuracy of the presence or absence of the above, which is preferable.
[0028]
Further, according to the work transfer method of claim 5, in the work transfer method of transferring a plurality of works at a time by using a plurality of chuck units for holding a conductive work, the plurality of chucks Attaching the anode-side conductive abutting member and the cathode-side conductive abutting member respectively provided to the part to the work, a work gripping step of gripping the work, and the anode-side conductive abutting member, A work transfer step of transferring the work and a movement of the plurality of chucks are stopped on condition that there is energization in a series circuit formed by the cathode-side conductive contact member and the work. And a work releasing step of releasing the work from being held by the plurality of chuck portions.
[0029]
In this way, the anode-side conductive contact member and the cathode-side conductive contact member respectively provided on the plurality of chuck portions are brought into contact with the work, and the work holding step of holding the work is performed. The workpiece transfer step of transporting the workpiece and the movement of the plurality of chuck portions are stopped on condition that there is energization in a series circuit formed by the contact member, the cathode-side conductive contact member, and the workpiece. And a workpiece grip release step of releasing the gripping of the workpieces in the plurality of chuck portions, even when a plurality of workpieces are transported at once using the plurality of chuck portions, the anode-side conductive contact member. The workpiece is transported on condition that there is energization in a series circuit formed by the cathode-side conductive abutting member and the workpiece. It is possible to prevent that by continuing with over click conveyor, which makes it possible to improve the transport efficiency of the work.
[0030]
Further, according to a multi-stage forging press according to claim 6, a plurality of press dies, a ram that operates the press dies, and a work transfer device that sequentially transfers a work to the press dies, In the multi-stage forging press in which the work is gradually finished to the final shape by sequentially passing through the press die, the work transfer device has a plurality of chucks for gripping a conductive work, A moving unit that moves the plurality of chuck units, and a work grip detection unit that detects whether or not each of the plurality of chuck units grips the work, is provided, and the plurality of chuck units include: An anode-side conductive contact member and a cathode-side conductive contact member that are in contact with the workpiece are provided, respectively, and among the plurality of chuck portions, the anode-side conductive contact member of one of the chuck portions is The cathode side conductive contact member of another chuck portion is electrically connected in series to the cathode side conductive contact member, and the work grip detection section includes the anode side conductive contact member, the cathode side conductive contact member, and the workpiece. The above configuration solves the problem by detecting whether or not each of the plurality of chucks is gripping the work by detecting the presence or absence of energization in the series circuit formed by the above.
[0031]
As described above, the work transfer device detects whether the plurality of chucks that hold the conductive work, the moving unit that moves the plurality of chucks, and whether each of the plurality of chucks is holding the work. And a plurality of chucks are provided with an anode-side conductive contact member and a cathode-side conductive contact member that are in contact with the work, respectively. The anode-side conductive contact member of the chuck portion is electrically connected in series with the cathode-side conductive contact member of the other chuck portion, and the workpiece gripping detection portion includes an anode-side conductive contact member and a cathode. If the plurality of chuck portions are configured to be able to detect whether or not each of the plurality of chucks is gripping the work, the series connection may be performed in series with the presence or absence of energization in a series circuit formed by the side conductive contact member and the work. circuit Only detect the presence or absence of definitive energization, it is possible to detect that the workpiece is dropped in any of the plurality of chuck.
[0032]
This makes it possible to prevent the work from being continued even if the work falls off, so that two works are simultaneously processed by the same press die. It is possible to prevent the occurrence and improve the operation rate.
[0033]
In addition, according to the shaft of the rotary electric machine described in claim 7, since the object is formed by the multi-stage forging press according to claim 6, the operation efficiency is improved by preventing occurrence of “double hit”. Accordingly, it is possible to reduce the manufacturing cost as compared with the related art.
[0034]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the members, arrangement, and the like described below do not limit the present invention, and can be variously modified in accordance with the gist of the present invention.
[0035]
1 to 8 are diagrams showing an embodiment of the present invention, FIG. 1 is an explanatory diagram showing a schematic configuration of a forging press, FIG. 2 is an explanatory diagram showing a state in which a chuck portion grips a work, and FIG. 3 is an explanatory view showing a state in which the chuck part has separated the work, FIG. 4 is a cross-sectional side view showing the configuration of the press die, FIG. 5 is a flowchart showing the operation flow of the work transfer device, and FIG. FIG. 7 is an explanatory view showing a state in which a chuck error has occurred when gripping a work, FIG. 7 is an explanatory view showing a state in which a chuck error has occurred during the transfer of a work in a forging press machine, and FIG. It is explanatory drawing which shows the state conveyed to the process and set to the press type | mold of each process.
[0036]
A multi-stage forging press 1 according to an embodiment of the present invention shown in FIG. 1 is suitable for a cold forging press of a work made of a conductive member, particularly, a shaft of a rotating electric machine. It has a plurality of forging steps up to four steps.
[0037]
The multi-stage forging press 1 is provided with a work transfer device 10 for transferring the work W. Further, in each of the first to fourth steps of the multi-stage forging press 1, Press dies 30a to 30d for forming the work W into a predetermined shape are provided.
[0038]
Then, in the multi-stage forging press 1, the work W is conveyed to the work conveyance device 10 to sequentially pass through the press dies 30a to 30d in each step, thereby gradually finishing to the final shape. ing.
[0039]
The work transfer device 10 transfers the work W to the next process in synchronization with the operation of the press dies 30a to 30d, and includes a chuck portion 11a to a chuck portion 11d, a reciprocating device 12, a loading device 13 , A carry-out device 14, a serial wiring connection unit 15, and a control device 16.
[0040]
As shown in FIG. 2, each of the chuck portions 11a to 11d (hereinafter, collectively referred to as the chuck portion 11) includes fingers 17a and 17b made of a pair of conductive members. The work W can be sandwiched between the work W and the finger 17b.
[0041]
The fingers 17a and 17b correspond to the anode-side conductive contact member and the cathode-side conductive contact member in the work transfer device of the present invention, respectively.
[0042]
A finger driving section 19 for driving the fingers 17a and 17b is provided on the chuck body section 18 of the chuck section 11. By driving the finger driving section 19, an interval between the fingers 17a and 17b is increased. Can be narrowed or expanded.
[0043]
Here, in the work transfer device 10 of the present embodiment, as described later, in the control device 116, the chuck units 11a to 11d, and the work W held by the chuck units 11a to 11d, respectively. Whether or not the work W is gripped by each of the plurality of chucks 11a to 11d can be determined based on the presence or absence of energization in the formed serial circuit A.
[0044]
To this end, the tip end P of the finger 17a is connected to the anode-side wiring portion of the series wiring connection portion 15, and the tip end P of the finger 17b is connected to the cathode-side wiring portion of the series wiring connection portion 15. Have been.
[0045]
Then, as shown in FIG. 2, when the conductive work W is held between the fingers 17a and 17b in the chuck portion 11, an electric current flows through the fingers 17a, the work W and the fingers 17b.
[0046]
On the other hand, as shown in FIG. 3, when the work W is not held between the fingers 17a and 17b in the chuck portion 11, no current flows between the fingers 17a and 17b.
[0047]
In addition, in the chuck portion 11 of the present embodiment, when the workpiece W is not gripped, the finger 17a and the finger 17b are connected to each other so as to prevent a short circuit between the finger 17a and the finger 17b. An insulating member 20a is provided between them. Similarly, an insulating member 20b is provided between the distal end P and the base Q of the finger 17b.
[0048]
In this manner, by ensuring that the fingers 17a and the fingers 17b are insulated from each other, it is possible to improve the detection accuracy of the presence / absence of workpiece gripping in the chuck portions 11a to 11d.
[0049]
As described above, the fingers 17a and 17b according to the present embodiment are configured to have both the function of gripping the work W and the function of detecting the presence / absence of work gripping in the chuck portions 11a to 11d. I have.
[0050]
The reciprocating device 12 shown in FIG. 1 corresponds to a moving portion in the work transfer device of the present invention, and is for reciprocating the chuck portions 11a to 11d.
[0051]
Inside the reciprocating device 12, a drive unit (both not shown) provided with a drive motor, gears and the like is provided, and a rod-shaped connecting member 12a is integrally assembled with this drive unit. I have. Chuck portions 11a to 11d are connected and fixed to the connection member 12a at predetermined intervals.
[0052]
Further, the reciprocating device 12 is configured to be driven in accordance with a drive signal from the control device 16, and is driven by the drive motor disposed inside the reciprocating device 12. The connecting member 12a can reciprocate along the X direction.
[0053]
In the work transfer device 10 of the present embodiment, the reciprocating device 12 reciprocates the connecting member 12a, so that the chuck portions 11a to 11d reciprocate between each process, and the work W is moved to the next process. Are sequentially conveyed to and set in a press die.
[0054]
The carry-in device 13 is for carrying the work W into the multi-stage forging press 1, and is constituted by a belt conveyor or the like. The work W carried in by the carry-in device 13 is sent to the first step by the chuck 11a.
[0055]
The unloading device 14 is for unloading the work W from the inside of the multi-stage forging press 1, and includes a belt conveyor or the like similar to the loading device 13. Then, the work W carried out from the fourth step by the chuck portion 11d is sent out of the multi-stage forging press 1 by the carry-out device 14.
[0056]
The serial wiring connection portion 15 is configured to include a plurality of wiring portions 15a to 15e made of a wire harness or the like, and includes fingers 17a provided on the plurality of chuck portions 11a to 11d, respectively. 17b and the work W sandwiched between the fingers 17a and 17b constitute a series circuit A.
[0057]
That is, in the series circuit A, as shown in the figure, the wiring portion 15a extending from the anode terminal 16a of the control device 16 is connected to the finger 17a of the chuck portion 11a by wiring, and is connected to the finger 17b of the chuck portion 11a. The part 15b is connected to the finger 17a of the chuck part 11b by wiring.
[0058]
The wiring portion 15c connected to the finger 17b of the chuck portion 11b is connected to the finger 17a of the chuck portion 11c by wiring, and the wiring portion 15d connected to the finger 17b of the chuck portion 11c is connected to the finger of the chuck portion 11d. 17a.
[0059]
Further, a wiring section 15e connected to the finger 17b of the chuck section 11d is connected to a cathode terminal 16b of the control device 16 by wiring.
[0060]
As described above, by providing the serial wiring connection portion 15, the fingers 17a and 17b provided in the plurality of chuck portions 11a to 11d and the work W sandwiched between the fingers 17a and 17b are connected in series. The circuit A can be configured.
[0061]
The control device 16 drives the chuck portions 11a to 11d, the reciprocating device 12, the carry-in device 13, and the carry-out device 14, and is configured by an electric circuit including a CPU and the like.
[0062]
The control device 16 is configured to detect a command signal from a press control device (not shown) provided in the multi-stage forging press 1 and the positions of the chuck portions 11a to 11d. A control signal can be output to each of the above-described devices in accordance with a position detection signal or the like from a position detector (not shown) provided in the transfer device 10, the reciprocating device 12, or the like.
[0063]
An anode terminal 16a and a cathode terminal 16b are provided at a predetermined position of the control device 16, and the control device 16 connects a predetermined connection to the series wiring connection portion 15 connected between the anode terminal 16a and the cathode terminal 16b. It is configured to allow current to flow.
[0064]
In addition, a work grip detection unit 16c is provided inside the control device 16. The work grip detection unit 16c is configured to detect the presence or absence of energization in the serial circuit A, whereby the control device 16 determines that the work W is normal in each of the chuck units 11a to 11d. It can be determined whether or not the user is grasped.
[0065]
The control device 16 can output a drive signal to the reciprocating device 12 when it is determined that each of the chuck portions 11a to 11d normally grips the work W. .
[0066]
Further, the control device 16 can stop outputting the drive signal to the reciprocating device 12 when it is determined that each of the chuck portions 11a to 11d is not gripping the work W. I have.
[0067]
As described above, according to the work transfer device 10 of the present embodiment, even when detecting the gripping state of the work W in the plurality of chucks 11a to 11d, it is only necessary to detect the presence or absence of energization in the series circuit A, Since it is possible to detect the falling of the work W, it is not necessary to provide a plurality of detectors and the like, and it is possible to reliably detect a chuck error with a simple configuration.
[0068]
In addition, the reciprocating device 12 is configured to move the chucks when the workpiece grip detector 16c detects that each of the chucks 11a to 11d is gripping the workpiece W. Therefore, it is possible to prevent the workpiece W from continuing to be transported in a state where the workpiece W is dropped, and it is possible to improve the workpiece transport efficiency.
[0069]
Next, the configuration of the press die of the multi-stage forging press 1 according to the present embodiment will be described. The press dies 30a to 30d according to the present embodiment are suitably configured to cold-forge press the shaft of the rotating electric machine.
[0070]
Here, FIG. 4 shows a press die 30a in the first step and a press die 30b in the second step as an example of the press die of the present embodiment. As shown in the figure, the press die 30a according to the first step is configured to have a die 31a and a punch 32a, and the press die 30b according to the second step is configured to have a die 31b and a punch 32b. I have.
[0071]
In the press dies 30a and 30b having the above-described configuration, the shaft S-1 as the work in the first step is held between the fingers 17a and 17b of the chuck portion 11a, and the shaft S-2 as the work in the second step is And the fingers 11a and 17b of the chuck portion 11b.
[0072]
The press die 30a according to the first step is configured so as to be suitable for forming, for example, a flange F at the base of the shaft in the shaft S-1 of the rotary electric machine as a work.
[0073]
That is, a space 33a having a predetermined shape corresponding to the shape of the shaft S-1 is formed in the die 31a of the press die 30a, and the punch 32a has a predetermined shape for forming the flange F on the shaft S-1. Is formed.
[0074]
On the other hand, the press die 30b according to the second step is configured so as to be suitable for forming, for example, tapered portions T1 and T2 at the tip of the shaft in the shaft S-2 of the rotary electric machine as a work.
[0075]
That is, a space 33b having a predetermined shape for forming a tapered portion T1 on the shaft S-2 is formed on the die 31b of the press die 30b, and a tapered portion T2 is formed on the shaft S-2 on the punch 32b. A space 34b having a predetermined shape is formed.
[0076]
The ram 35 is formed of a reciprocable table, and the punch 32a and the punch 32b are fixed to the ram 35.
[0077]
In the multi-stage forging press 1 of the present embodiment, the ram 35 is advanced in a state where the shafts S-1 and S2 are set in the press dies 30a and 30b, respectively, thereby forging the shafts S-1 and S2. Simultaneously, by retracting the ram 35, the molded shafts S-1, S2 can be taken out from the press dies 30a, 30b.
[0078]
In the present embodiment, only the configuration of the press die 30a according to the first process and the configuration of the press die 30b according to the second process have been described. However, in the multi-stage forging press 1, the press according to the third process is performed. The mold 30c and the press mold 30d according to the fourth step are also preferably configured to forge a shaft of a rotating electric machine, like the press mold 30a according to the first step and the press mold 30b according to the second step. ing.
[0079]
In addition, the space for forming the shaft in the press dies 30a to 30d is not limited to the above-described shape for forming the flange F and the tapered portions T1 and T2. The shape should be such that it can be used to perform various types of forming processes, such as shaping, tip D-shape forming, screw forming, journal forming, and fitting of core and commutator. Is possible.
[0080]
Further, the multi-stage forging press 1 can be configured as a vertical forging press or a horizontal forging press.
[0081]
In the multi-stage forging press 1 of the present embodiment, the shaft of the rotary electric machine is gradually finished to the final shape by sequentially passing through the respective press dies from the first step to the fourth step. It has become.
[0082]
Next, the unloading operation and the abnormality detecting operation of the work transfer device 10 in the multi-stage forging press 1 according to the present embodiment will be described with reference to FIG. In the embodiment described below, a description will be given after the work W is already set in the press dies 30a to 30d and forging in each step is completed.
[0083]
First, in the multi-stage forging press 1 shown in FIG. 1, when forging in each step is completed and a command signal is transmitted from a press control device (not shown) to the control device 16 of the work transfer device 10, the command signal is transmitted. The control device 16 that has received the data causes the reciprocating device 12 to operate to move the chuck portions 11a to 11d to predetermined positions in each process (for example, a position where the chuck portion 11a reaches the press die 30a in the first process). Move.
[0084]
Then, the controller 16 transmits a command signal to the chuck units 11a to 11d in a state where the chuck units 11a to 11d have moved to predetermined positions in each process, so that the chuck units 11a to 11d Then, the workpiece W in each process is gripped (step S1).
[0085]
That is, as shown in FIG. 1, the chuck portions 11a, 11b, 11c, 11d respectively grip the workpieces W in the press dies 30a, 30b, 30c, 30d.
[0086]
Then, the control device 16 supplies a predetermined current to the series wiring connection unit 15 to check the energization (step S2), and determines whether or not the energization has been performed (step S3).
[0087]
At this time, if the work W is normally gripped in all of the chuck portions 11a to 11d, the current flowing out from the anode terminal 16a of the control device 16 is applied to each wiring portion of the serial wiring connection portion 15, each chuck portion, Flow through the fingers 17a, 17b and the work W sandwiched between the fingers 17a, 17b to the cathode terminal 16b.
[0088]
Therefore, when the current flowing from the anode terminal 16a of the control device 16 flows to the cathode terminal 16b, the control device 16 holds the work W normally in all of the chuck portions 11a to 11d. Judge.
[0089]
On the other hand, as shown in FIG. 6, in the operation of each of the chucks 11a to 11d gripping the work W in each process (step S1), when any of the chucks cannot grip the work W ( In FIG. 6, the work W has fallen off at the chuck portion 11b), and the current flowing from the anode terminal 16a of the control device 16 to the series wiring connection portion 15 does not flow to the cathode terminal 16b.
[0090]
Therefore, if the current flowing from the anode terminal 16a of the control device 16 to the series wiring connection portion 15 does not flow to the cathode terminal 16b even after the energization check (step S2), the control device 16 Determines that the workpiece W has not been properly gripped by any of the chucks 11a to 11d (NO in step S3), and interrupts the workpiece transport operation (step S13).
[0091]
On the other hand, an energization check (step S2) is performed, and when the current flowing from the anode terminal 16a of the control device 16 to the series wiring connection portion 15 flows to the cathode terminal 16b, the control device 16 It is determined that the work W has been normally gripped in all of the parts 11a to 11d (YES in step S3).
[0092]
Then, the control device 16 operates the reciprocating device 12 to move the chuck portions 11a to 11d to predetermined positions in the next process (for example, a position where the chuck portion 11a reaches the press die 30b in the second process). Move to Thus, the work W is transported to the next step, respectively (step S4).
[0093]
Also, while the work W is being conveyed to the next process, the control device 16 checks the energization by applying a predetermined current to the series wiring connection unit 15 (step S5), and determines whether or not the energization is performed. Is determined (step S6).
[0094]
When the control device 16 determines that the work W is normally held in all of the chuck portions 11a to 11d while the work W is being conveyed to the next step, the reciprocating device 12 Continue to operate.
[0095]
On the other hand, as shown in FIG. 7, in the operation of transporting the work W to the next step (step S4), when the work W falls off from one of the chuck portions (in FIG. 7, the work W When W has dropped off), the current flowing from the anode terminal 16a of the control device 16 to the series wiring connection portion 15 does not flow to the cathode terminal 16b.
[0096]
Therefore, if the current flowing from the anode terminal 16a of the control device 16 to the series wiring connection portion 15 does not flow to the cathode terminal 16b even after the energization check (step S5), the control device 16 judges that the work W has fallen out of any of the chuck portions 11a to 11d (NO in step S6), and interrupts the work transfer operation (step S13).
[0097]
On the other hand, an energization check (step S2) is performed. If the current flowing from the anode terminal 16a of the control device 16 to the series wiring connection portion 15 is flowing to the cathode terminal 16b of the control device 16, the control device No. 16 determines that the work W is normally gripped in all of the chuck portions 11a to 11d (YES in step S6).
[0098]
Then, the control device 16 operates the reciprocating device 12 to continue the movement of the chuck portions 11a to 11d to the next step.
[0099]
Further, while the workpiece W is being conveyed to the next step, the control device 16 performs the above-described energization check and receives a position detection signal output from the position detector (not shown). Then, the current positions of the chuck portions 11a to 11d are detected (step S7), and it is determined whether or not the predetermined position in the next process has been reached, that is, whether or not the transfer of the work W has been completed (step S8). ).
[0100]
A series of processes from the energization check (step S5) to the determination of the end of the conveyance (step S8) are periodically performed by, for example, an interrupt process of inputting a signal every 5 msec in the control device 16.
[0101]
As described above, the controller 16 periodically performs a series of processes from the energization check (step S5) to the determination of the end of the transport (step S8), so that any one of the chuck units 11a to 11d is transported during the workpiece transport. Even if the work W falls off from the, the conveyance of the work W can be stopped immediately.
[0102]
Then, based on the position detection signal output from the position detector, the control device 16 determines that the chuck portions 11a to 11d are at predetermined positions in the next process (for example, the chuck portion 11a is a press mold in the second process). If it is determined that the position has reached (the position reaching 30b) (YES in step S8), the movement of the chuck portions 11a to 11d is stopped (step S9).
[0103]
In this way, in a state where the chuck portions 11a to 11d are stopped at the predetermined positions, the control device 16 releases the clamping of the work W by the fingers 17a and 17b by the chuck portions 11a to 11d. Command signal is output (step S10).
[0104]
Thereby, as shown in FIG. 8, the work W conveyed from the press die of the previous process is set on the press die of the next process. The work W forged in the press die 30d is sent out of the multi-stage forging press 1 by the unloading device 14.
[0105]
Thus, in the multi-stage forging press 1 of the present embodiment, the work W is transported to the next step. Then, the control device 16 determines whether the forging of the workpiece W is to be performed or not (Step S11). If the forging of the workpiece W is to be performed (NO in Step S11), the chuck units 11a to 11a to 11D are to be formed. Control is performed to return the chuck 11d to the position of the previous process again (step S12).
[0106]
Thereafter, by performing the operations of steps S1 to S12, the workpieces W are successively sent out of the multi-stage forging press 1 as final shapes.
[0107]
Further, when gripping the work W forged by the press die, any of the chuck portions 11a to 11d cannot normally grip the work W, or during the transfer of the work, the chuck portions 11a to 11d. When the work W is dropped from the work, the work transfer by the work transfer device 10 is immediately interrupted.
[0108]
On the other hand, when a predetermined number of the works W are formed, the control device 16 determines that the forging of the works W is to be ended (YES in step S11), and a series of the work forging and forming is ended.
[0109]
As described above, since the multi-stage forging press 1 of the present embodiment is provided with the work transfer device 10, the chuck portion 11a to the chuck portion 11 of the work W can be detected only by detecting the presence or absence of energization in the series circuit A. It is possible to detect the falling off from 11d, and it is possible to reliably detect a chuck error.
[0110]
This makes it possible to prevent the work from being continued even if the work W falls off, so that two works are simultaneously processed by the same press die, so-called “two-shot”. Can be prevented, and the operation rate can be improved.
[0111]
In addition, by using the multi-stage forging press 1, it is possible to reduce the manufacturing cost of the shafts S-1 and S-2 of the rotating electric machine as compared with the related art.
[0112]
As described above, according to the present embodiment, the following effects can be obtained.
(A) In the work transfer device 10 of the present embodiment shown in FIG. 1, a series circuit A is formed by the control device 116, the chuck portions 11a to 11d, and the work W gripped by these chuck portions. It has become so.
[0113]
The work grip detection unit 16c is configured to detect whether or not each of the chuck units 11a to 11d is gripping the work W based on the presence or absence of energization in the serial circuit A.
[0114]
Therefore, even when detecting the gripping state of the work W in the plurality of chucks 11a to 11d as in the present embodiment, the plurality of chucks 11a to 11d can be detected only by detecting the energization in the series circuit A. Since it is possible to detect that the work W has dropped in any of the portions 11d, it is not necessary to provide a plurality of detectors and the like, and it is possible to reliably detect a chuck error with a simple configuration.
[0115]
As a result, even when the gripping state of the workpiece W in the plurality of chucks 11a to 11d is detected, the number of components can be reduced as compared with the related art, and the cost can be reduced.
[0116]
(B) When the reciprocating device 12 detects that each of the chucks 11a to 11d is gripping the work W by the work grip detector 16c, the chucks are moved. When the work W is not gripped by any of the plurality of chucks 11a to 11d, work transfer is not performed, and the work W drops from the chucks 11a to 11d. It is possible to prevent the work transfer from continuing in the state, and it is possible to improve the work transfer efficiency.
[0117]
(C) Since the fingers 17a and 17b have a function of gripping the workpiece W and a function of detecting the presence / absence of gripping of the workpiece in the chucks 11a to 11d, the chuck 17 11a to 11d can have a simple configuration.
[0118]
(D) Further, as shown in FIG. 2, since the insulating members 20a and 20b are provided between the distal end portions P and the base portions Q of the fingers 17a and 17b, the fingers 17a and 17b are separated from each other. As a result, it is possible to reliably insulate, and it is possible to improve the detection accuracy of the presence / absence of workpiece gripping in the chuck portions 11a to 11d.
[0119]
(E) Further, the multi-stage forging press 1 of the present embodiment shown in FIG. 1 is provided with the work transfer device 10 described above. It is possible to detect that the workpiece W has dropped in any of the portions 11a to 11d.
[0120]
This makes it possible to prevent the work from being continued even if the work W falls off, so that two works are simultaneously processed by the same press die, so-called “two-shot”. Can be prevented, and the operation rate can be improved.
[0121]
(F) Since the shafts S-1 and S-2 of the rotary electric machine according to the present embodiment shown in FIG. 4 are formed by the multi-stage forging press 1, the operating rate by preventing the occurrence of "double hit" is obtained. By the improvement effect, it becomes possible to reduce the manufacturing cost as compared with the conventional case.
[0122]
The embodiment of the present invention can be modified as follows. Here, FIGS. 9 to 11 are block diagrams showing modified examples of the work transfer device 10 of the present embodiment, FIG. 9 is a diagram showing a first modified example, FIG. 10 is a diagram showing a second modified example, FIG. 11 is a diagram showing a third modification. Hereinafter, these modified examples will be described.
[0123]
(A) In the work transfer device 10 of the present embodiment, the two fingers 17a and 17b are provided in the chuck portions 11a to 11d, respectively, but the present invention is not limited to this.
[0124]
For example, three fingers 117a, 117b, and 117c may be provided in the chuck portions 111a to 111d, respectively, as in a work transfer device 110 according to a first modification of the present embodiment illustrated in FIG.
[0125]
Here, in this modified example, the fingers 117a and 117b in each chuck portion correspond to the anode-side conductive contact member and the cathode-side conductive contact member in the work transfer device of the present invention, respectively.
[0126]
As described above, each of the chuck portions 111a to 111d is provided with a separate finger 117c in addition to the finger 117a as the anode-side conductive contact member and the finger 117b as the cathode-side conductive contact member. Thereby, it is possible to increase the stability of the work W when gripping.
[0127]
Needless to say, the shapes of the fingers 117, 117b, and 117c can be variously modified in accordance with the shape of the work W.
[0128]
Also, in the work transfer device 110 according to the present modification, similarly to the work transfer device 10 illustrated in FIG. 1, the series wiring connection portion 115 is disposed between the control device 116 and each chuck portion, A series circuit B is formed by the fingers 117a and 117b provided on each of the plurality of chuck portions 111a to 111d and the work W sandwiched between the fingers 117a and 117b.
[0129]
By detecting the presence or absence of energization in the series circuit B by the control device 116, it is possible to detect the drop of the work W in any of the chuck portions 111a to 111d.
[0130]
(B) In the work transfer device 10 of the present embodiment, the pair of fingers 17a and 17b are provided in the chuck portions 11a to 11d, respectively, but the present invention is not limited to this.
[0131]
For example, as in a work transfer device 210 according to a second modification of the present embodiment shown in FIG. 10, two pairs of fingers 217a and 217b and fingers 217c and 217d are provided in the chuck portions 211a to 211d, respectively. May be.
[0132]
Here, in this modified example, the fingers 217a and 217c in each chuck portion correspond to the anode-side conductive contact member in the work transfer device of the present invention, and the fingers 217b and 217d correspond to the work transfer of the present invention. This corresponds to a cathode-side conductive contact member in the device.
[0133]
As described above, even when each of the chuck portions 211a to 211d is provided with the two pairs of fingers 217a and 217b and the fingers 217c and 217d, it is possible to increase the stability when the workpiece W is gripped. .
[0134]
In addition, the shape of the fingers 217, 217b, 217c, and 217d can be variously modified in accordance with the shape of the work W in order to increase the stability in gripping the work W.
[0135]
Further, the chuck portions 211a to 211d may be configured such that one end of the bar-shaped workpiece W is held between the fingers 217a and 217b, and the other end is held between the fingers 217c and 217d. good.
[0136]
Further, in the work transfer device 210 according to this modification, similarly to the work transfer device 10 illustrated in FIG. 1, the series wiring connection portion 215 is provided between the control device 216 and each chuck unit, A series circuit C is formed by the fingers 217a, 217b, 217c, 217d provided in each of the plurality of chuck portions 211a to 211d, and the work W sandwiched between the fingers 217a, 217b, 217c, 217d. I have.
[0137]
In this series wiring connection portion 215, the finger 217a is connected to the finger 217c and the finger 217b is connected to the finger 217d.
[0138]
Then, the control device 216 detects whether the series circuit C is energized or not, thereby making it possible to detect the falling off of the work W in any of the chuck portions 211a to 211d.
[0139]
(C) In the work transfer device 10 of the present embodiment, the work 17 is formed by the fingers 17a and 17b provided in each of the plurality of chucks 11a to 11d and the work W sandwiched between the fingers 17a and 17b. Although only one series circuit is provided, the present invention is not limited to this.
[0140]
For example, as in a work transfer device 310 according to a third modification of the present embodiment shown in FIG. 11, fingers 317a to 317d provided in a plurality of chucks 311a to 311d, and fingers 317a to 317d. A plurality of series circuits formed by the work W sandwiched between the fingers 317d may be configured.
[0141]
That is, each of the chuck portions 311a to 311d is provided with a pair of fingers 317a and 317b and fingers 317c and 317d, and these fingers are connected in series by the series wiring connection portions 315a and 315b, respectively, as shown in the figure. Wiring is connected.
[0142]
Thus, a series circuit D is formed by the control device 316, the fingers 317a and 317b of the chuck portions 311a to 311d, and the work W sandwiched between the fingers 317a and 317b.
[0143]
Further, a series circuit E is configured by the control device 316, the fingers 317c and 317d of the chuck portions 311a to 311d, and the work W sandwiched between the fingers 317c and 317d.
[0144]
Here, in this modified example, the fingers 317a and 317c in each chuck portion correspond to the anode-side conductive contact member in the work transfer device of the present invention, and the fingers 317b and 317d correspond to the work transfer of the present invention. This corresponds to a cathode-side conductive contact member in the device.
[0145]
Further, the fingers 317, 317b, 317c, and 317d are configured to conform to the shape of the work W in order to increase the stability in gripping the work W.
[0146]
Further, the chuck portions 311a to 311d are configured such that one end of the bar-shaped workpiece W is held between fingers 317a and 317b, and the other end is held between fingers 317c and 317d.
[0147]
Then, in the work transfer device 310 according to the third modification, the work grip detection unit 316c of the control device 316 determines whether the work W in the chuck units 311a to 311d is dropped depending on whether the series circuits D and E are energized. Alternatively, at least one of the positional shifts of the workpiece W can be detected.
[0148]
That is, in the control device 316, when it is detected that power is supplied to both the series circuit D and the series circuit E, the work W is gripped by any of the chucks 311a to 311d. It is configured to be able to judge.
[0149]
Further, when it is not detected that power is supplied to either the series circuit D or the series circuit E, it is possible to determine that the work W has dropped in any of the chuck portions 311a to 311d. .
[0150]
Further, when it is detected that only one of the series circuit D and the series circuit E is energized, the workpiece W is gripped by any of the chucks 311a to 311d. It is configured to be able to determine that the workpiece W is not normally gripped in the section.
[0151]
Here, if described in detail with reference to FIG. 11, in the chuck portion 311b, the workpiece W is separated from the fingers 317c and 317d, and is biased toward the fingers 317a and 317b.
[0152]
As a result, no current is supplied between the finger 317c and the finger 317d, so that the work grip detection unit 316c is in a state where no current is supplied to the series circuit E.
[0153]
Accordingly, in the control device 316, since the energization in the series circuit D is obtained and the energization in the series circuit E is not obtained, the work W is gripped by any of the chucks 311a to 311d. It is determined that the workpiece W is not normally gripped by any of the chuck portions.
[0154]
As described above, according to the work transfer device 310 according to the third modification of the present embodiment, it is possible to determine that the work W is not held at a normal position in addition to the work W having fallen off. Therefore, when the work transfer device 310 is applied to the multi-stage forging press 1 shown in FIG. 1, it is possible to avoid a situation in which the work W is inclined and set on the press die.
[0155]
In the work transfer device 310 according to the third modification, a plurality of pairs of fingers are provided in the chuck portions 311a to 311d, and a number of series circuits corresponding to the number of pairs of the fingers is configured. It is needless to say that a series wiring connection portion may be formed.
[0156]
(D) In the above-described embodiment, the forging process of the multi-stage forging press 1 is provided in four steps from the first step to the fourth step. However, the forging press of the present invention is not limited to this, and may include a plurality of steps. If so, there is no particular limitation.
[0157]
(E) In the above embodiment, the chuck portions 11a to 11d of the work transfer device 10 are configured to reciprocate between the respective steps, but the present invention is not limited to this. For example, even if the carry-in device 13, the press dies 30a to 30d, and the carry-out device 14 are arranged in an annular shape, the chuck portions 11a to 11d are configured to orbit in one direction along the annular arrangement. good.
[0158]
(F) In the above embodiment, the work transfer device 10 is used in the multi-stage forging press 1, but the work transfer device of the present invention is not limited to the use of the forging press. The work transfer device 10 can be used for an assembly line, a rust prevention treatment line, a quality inspection line, and the like, in addition to the forging press.
[0159]
(G) In the work transfer device 10 of the above embodiment, when the work W is dropped from the chuck portions 11a to 11d during the transfer of the work or the work W cannot be held normally, that is, the conduction check (step in FIG. 5) If it is not detected in S2 and S5) that power is supplied, an abnormality may be notified by a display lamp, a sound device, or the like.
[0160]
(H) In the above embodiment, the anode-side conductive contact member (finger 17a) and the cathode-side conductive contact member (finger 17b) provided in the chuck portions 11a to 11d have the function of gripping the work W. Although the configuration has a function for detecting the presence or absence of work gripping in the chuck portion, the present invention is not limited to this.
[0161]
For example, the chuck portions 11a to 11d are provided with fingers having only a function of gripping the workpiece W, and an anode having a function of detecting whether or not the workpiece is gripped is provided separately from the fingers. A side conductive contact member and a cathode side conductive contact member may be provided.
[0162]
(I) In the above embodiment, the multistage forging press machine 1 is described as forging a rotary electric machine shaft as an example of the work W in the multistage forging press machine 1. However, the multistage forging press machine of the present invention is not limited to this. Not something. The work W may be a core, a yoke housing, a bearing support device, or the like of the rotating electric machine, other than the shaft of the rotating electric machine, and may be a metal member other than the constituent members of the rotating electric machine. .
[0163]
The technical ideas other than the claims that can be grasped from the above embodiments will be described below together with their effects.
[0164]
(1) The moving unit is configured to move the plurality of chuck units when the work grip detection unit detects that each of the plurality of chuck units is gripping the work. The multi-stage forging press according to claim 6, wherein:
[0165]
With such a configuration, it is possible to prevent the workpiece from continuing to be transported in a state where the workpiece is dropped from the chuck portion, and it is possible to improve the workpiece transport efficiency, which is preferable.
[0166]
(2) The multi-stage forging press according to claim 6, wherein the anode-side conductive contact member and the cathode-side conductive contact member are configured to be able to grip the work.
[0167]
With such a configuration, it is possible to provide a configuration having both the function of gripping the work and the function of detecting the presence / absence of work gripping in the chuck portion, so that the chuck portion can have a simple configuration. It is possible and preferred.
[0168]
(3) An insulating member is provided between the anode-side conductive contact member and the cathode-side conductive contact member in the plurality of chuck portions, respectively. Multi-stage forging press machine.
[0169]
With this configuration, the anode-side conductive contact member and the cathode-side conductive contact member can be reliably insulated from each other, so that the accuracy of detecting whether or not the workpiece is gripped by the chuck portion is improved. It is possible and preferable.
[0170]
(4) A workpiece transfer including a plurality of chucks for gripping a workpiece, a moving unit for moving the chuck, and a workpiece grip detector for detecting whether the chuck is gripping the workpiece. In the apparatus, a plurality of the anode-side conductive contact members and a plurality of the cathode-side conductive contact members that are in contact with the workpiece are provided in the plurality of chuck portions, respectively. The anode-side conductive contact member is electrically connected in series with the cathode-side conductive contact member of the other chuck unit, and the work grip detection unit includes the anode-side conductive contact member and the cathode-side conductive contact member. At least one of dropping of the work or displacement of the work in the chuck portion is detected based on the presence or absence of energization in a plurality of series circuits formed by the conductive contact member and the work. Workpiece transfer apparatus characterized capable to be configured.
[0171]
With this configuration, even when detecting the gripping state of the work in the plurality of chuck portions, at least one of the dropout of the work or the positional shift of the work is detected by merely detecting the presence or absence of energization in the plurality of serial circuits. Therefore, it is not necessary to provide a plurality of detectors and the like, and it is possible to reliably detect a chuck error with a simple configuration.
[0172]
As a result, even when detecting the gripping state of the work in the plurality of chuck portions, the number of components can be reduced as compared with the conventional case, and the cost can be reduced.
[0173]
(5) The moving unit is configured to, when one of the plurality of chucks detects dropout of the work or displacement of the work in any of the plurality of chucks, by the work grip detection unit. The workpiece transfer device according to the above technical concept (4), wherein the movement of the workpiece is stopped.
[0174]
With this configuration, it is possible to prevent the workpiece from being continued to be transported in a state where the workpiece is not normally gripped by the chuck portion, and it is possible to improve the workpiece transport efficiency. It is suitable.
[0175]
【The invention's effect】
As described in detail above, according to the work transfer device of the present invention, even when detecting the gripping state of a work in a plurality of chuck portions, there is no need to provide a plurality of detectors and the like, and the chuck mistake can be reliably achieved with a simple configuration. Can be detected, the number of parts can be reduced as compared with the conventional case, and the cost can be reduced.
[0176]
In addition, when the workpiece is not gripped by any of the plurality of chucks, the workpiece is not transported, so that it is possible to prevent the workpiece from continuing to be transported in a state where the workpiece is dropped from the chuck. In addition, it is possible to improve the work transfer efficiency.
[0177]
Further, according to the work transfer method of the present invention, it is possible to prevent the work transfer from being continued in a state where the work has fallen, so that it is possible to improve the work transfer efficiency.
[0178]
Further, according to the multi-stage forging press of the present invention, even if the work falls, it is possible to prevent the work from being continued, so that the two works are simultaneously processed by the same press die. It is possible to prevent the occurrence of so-called “double hitting”, and to improve the operation rate.
[0179]
Further, according to the shaft of the rotating electric machine of the present invention, since it is formed by the above-mentioned multi-stage forging press, the operation cost is improved by preventing the occurrence of "double hit", thereby reducing the production cost as compared with the conventional case. It becomes possible.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram illustrating a schematic configuration of a forging press according to an embodiment.
FIG. 2 is an explanatory diagram illustrating a state in which a chuck unit according to the present embodiment is gripping a work.
FIG. 3 is an explanatory diagram illustrating a state in which a chuck unit according to the embodiment has separated a work.
FIG. 4 is a cross-sectional side view illustrating a configuration of a press die according to the present embodiment.
FIG. 5 is a flowchart illustrating an operation flow of the work transfer device according to the embodiment;
FIG. 6 is an explanatory diagram showing a state in which a chuck error has occurred when gripping a workpiece in the forging press according to the present embodiment.
FIG. 7 is an explanatory view showing a state in which a chuck error has occurred during the transfer of a workpiece in the forging press according to the embodiment.
FIG. 8 is an explanatory diagram showing a state in which a work is conveyed to the next step and set on a press die in each step in the forging press according to the embodiment.
FIG. 9 is a block diagram illustrating a configuration of a work transfer device according to a first modification of the present embodiment.
FIG. 10 is a block diagram illustrating a configuration of a work transfer device according to a second modification of the present embodiment.
FIG. 11 is a block diagram illustrating a configuration of a work transfer device according to a third modification of the present embodiment.
FIG. 12 is an explanatory diagram showing a state in which two hits (abnormality) of a work have occurred in a forging press according to a conventional technique.
[Explanation of symbols]
1,401 Multi-stage forging press machine, 10, 110, 210, 310, 410 Work transfer device, 11, 11a, 11b, 11c, 11d, 111a, 111b, 111c, 111d, 211a, 211b, 211c, 211d, 311a, 311b, 311c, 311d, 411a, 411b, 411c, 411d, 411e Chuck portion, 12 reciprocating device, 12a connecting member, 13 carry-in device, 14 carry-out device, 15, 115, 215, 315a, 315b Series wiring connection portion, 15a , 15b, 15c, 15d, 15e Wiring unit, 16, 116, 216, 316 Control unit, 16a anode terminal, 16b cathode terminal, 16c, 316c Work grip detection unit, 17a, 17b, 117a, 117b, 117c, 217a, 217b , 317a, 317b, 317 c, 317d finger, 18 chuck body, 19 finger drive, 20a, 20b insulating member, 30a, 30b, 30c, 30d, 430a, 430b, 430c, 430d Press mold, 31a, 31b Dice, 32a, 32b Punch, 33a , 33b space, 34a, 34b space, 35 ram, 414 discharge conveyor, A, B, C, D, E series circuit, F flange, P tip, Q base, S-1, S-2 shaft, T1 , T2 tapered part, W work

Claims (7)

A plurality of chucks for gripping the conductive workpiece, a moving unit for moving the plurality of chucks, and a workpiece gripping detector for detecting whether or not each of the plurality of chucks grips the workpiece; In the work transfer device provided with,
The plurality of chuck portions are provided with an anode-side conductive contact member and a cathode-side conductive contact member that are in contact with the workpiece, respectively.
Among the plurality of chuck portions, the anode-side conductive contact member of one chuck portion is electrically connected in series with the cathode-side conductive contact member of another chuck portion,
The work grip detection unit, the anode-side conductive contact member, the cathode-side conductive contact member, and the work, by the presence or absence of energization in a series circuit formed by, each of the plurality of chuck units A work transfer device configured to detect whether or not the work is gripping the work. The moving unit may be configured to move the plurality of chuck units when each of the plurality of chuck units detects that the plurality of chuck units are gripping the work by the work grip detection unit. The work transfer device according to claim 1, wherein: The work transport device according to claim 1, wherein the anode-side conductive contact member and the cathode-side conductive contact member are configured to be able to grip the work. 2. The work carrier according to claim 1, wherein an insulating member is provided between the anode-side conductive contact member and the cathode-side conductive contact member in the plurality of chuck portions, respectively. 3. apparatus. In a work transfer method for transferring a plurality of works at a time by using a plurality of chucks for holding a conductive work,
Attaching the anode-side conductive abutting member and the cathode-side conductive abutting member respectively provided to the plurality of chuck portions to the workpiece, and a workpiece gripping step of gripping the workpiece,
A work transfer step of transferring the work, on condition that there is energization in a series circuit formed by the anode-side conductive contact member, the cathode-side conductive contact member, and the work,
A work grip release step of stopping the movement of the plurality of chuck sections and releasing the grip of the work in the plurality of chuck sections,
A method for transporting a work, comprising: A plurality of press dies, a ram for operating the press dies, and a work transfer device for sequentially transferring the work to the press dies, and the work is gradually formed into a final shape by sequentially passing through the press dies. In the finished multi-stage forging press,
The work transfer device has a plurality of chucks for gripping a conductive work, a moving unit for moving the plurality of chucks, and whether or not each of the plurality of chucks is gripping the work. And a work grip detection unit for detecting
The plurality of chuck portions are provided with an anode-side conductive contact member and a cathode-side conductive contact member that are in contact with the workpiece, respectively.
Among the plurality of chuck portions, the anode-side conductive contact member of one chuck portion is electrically connected in series with the cathode-side conductive contact member of another chuck portion,
The work grip detection unit, the anode-side conductive contact member, the cathode-side conductive contact member, and the work, by the presence or absence of energization in a series circuit formed by, each of the plurality of chuck units A multi-stage forging press configured to detect whether or not the workpiece is gripping the work. A shaft of a rotating electric machine formed by the multi-stage forging press according to claim 6.

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