JP4391778B2 - Drawing device manufacturing apparatus and drawing product manufacturing method - Google Patents

Description

  The present invention relates to a drawing machine manufacturing apparatus and a drawing machine manufacturing method.

  As shown in Patent Document 1, a drawn product (finished part) such as a motor yoke is manufactured by performing multi-stage drawing (pressing) on a workpiece. The drawing process includes various processes such as a drawing process and a forming process. In the drawing process, the workpiece is formed into a bottomed cylindrical shape, and the diameter is gradually reduced. And a motor yoke is manufactured by shape | molding details in a shaping | molding process. In drawing, the entire outer periphery of the workpiece is clamped between the lower and upper molds of a transfer press (molding machine) used to manufacture the motor yoke, and a punch (punch) is held at a constant pressure on the clamped workpiece. Or by pressing a workpiece formed in a bottomed cylindrical shape into the hole of the upper die (drawing die).

In addition, the transfer press has a pneumatic pressure generator (in order to prevent wrinkles on the workpiece and to remove the manufactured motor yoke from the mold (upper mold, lower mold)). Die cushion) is attached. In this case, it has been proposed to draw the workpiece while holding the workpiece between the die cushion and the upper die, but such a machining method may reduce the accuracy of the motor yoke. Therefore, generally, the die cushion is lowered to the processing position in advance using a pin built in the upper die, and the workpiece is drawn by holding the workpiece between the lower die and the upper die. .
JP 59-30431 A

  By the way, the pins incorporated in the upper mold are usually arranged so as to be inserted through the inside of the transfer feeding device in a direction orthogonal to the feeding direction of the transfer feeding device. However, there is a possibility that the pin interferes with a transfer feeding device, specifically, a finger for sandwiching a workpiece (motor yoke being processed). In order to solve this problem, it is necessary to make the amount of movement (sliding stroke) from the top dead center to the bottom dead center of the upper mold larger (four times or more) than the height of the motor yoke.

  Therefore, in order to improve the productivity of the motor yoke, it is necessary to move the upper mold at a high speed. However, it is difficult to operate the transfer press so as to follow the speed of the upper die. Further, since the speed of the upper mold is increased, the motor yoke generates heat due to friction with the upper mold. Therefore, the productivity of the motor yoke cannot be improved.

  The present invention has been made paying attention to the above problems, and an object of the present invention is to provide a drawing machine manufacturing apparatus and a drawing machine manufacturing method capable of improving productivity.

In order to solve the above-described problems, in the invention described in claim 1, the workpiece that is sent to the next process stepwise by the transfer feeding device is subjected to multi-stage drawing with a multi-stage drawing machine. The drawing apparatus for producing a drawn product formed in a substantially bottomed cylindrical shape, wherein the transfer feeding device includes a pair of feed bars arranged along the feeding direction of the workpiece, and each feed bar has a finger. The workpiece is configured to be sandwiched between fingers provided so as to face each other between the two feed bars, and the drawing machine has an upper mold for drawing the workpiece. The lower mold pin provided on the lower mold is pressed and lowered by the upper mold pin provided on the upper mold on the basis of the lowering of the upper mold. Thus, the lower die is configured to perform a predetermined operation before the drawing starts, and the upper die pin and the lower die pin are in a direction perpendicular to the feeding direction of the transfer feeding device. The gist is that the transfer feeding device is disposed outside the fingers and the feed bar .

  In the invention of claim 2, in the invention of claim 1, the upper mold is provided with a die having a machining hole, and the lower mold is provided with a punch inserted into the machining hole, The lower mold is operated to insert the workpiece into the punch before the drawing process starts by pressing and lowering the lower mold pin with the upper mold pin based on the lowering of the upper mold. The gist is to do.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the upper mold pin and the lower mold pin are arranged on both sides in a direction orthogonal to the feeding direction of the transfer feeding device. It is a summary.

In the invention according to claim 4, the workpiece can be clamped by fingers provided in each of the pair of feed bars arranged along the feeding direction of the workpiece and arranged to face each other between the two feed bars. A method for producing a drawn product that is formed into a substantially bottomed cylindrical shape by subjecting a workpiece, which is sent to the next process stepwise by a configured transfer feeding device, to multistage drawing with a drawing machine provided in multiple stages. The drawing machine lowers the upper mold of the processing machine so as to be close to the lower mold in order to draw the workpiece, and moves the upper mold to the upper mold based on the lowering of the upper mold. The lower mold pin provided on the lower mold is pressed and lowered by the upper mold pin provided to cause the lower mold to perform a predetermined operation before the drawing process is started. Mold pin, front In the direction orthogonal to the feeding direction of the transfer feeder with arranged outside of the fingers and the feed bar of the transfer feeder, the gist to carry out drawing.

(Function)
In the invention according to claim 1 and claim 4, since the upper die pin and the lower die pin are arranged outside the finger and feed bar of the transfer feeder in a direction orthogonal to the feed direction of the transfer feeder , It is avoided that the upper mold pin and the lower mold pin interfere with the transfer feeder. Thus, the upper mold slide stroke can be reduced. Therefore, the drawing process can be completed in a short time without moving the upper die at high speed. Therefore, it is not difficult to operate the drawing machine so as to follow the speed of the upper die. Further, since the speed of the upper die does not increase, it is possible to prevent the drawn product from generating heat due to friction with the upper die. That is, the productivity of a drawn product can be improved at the same drawing speed as before.

  In the invention described in claim 2, since the upper mold pin and the lower mold pin are arranged outside the transfer feeding device in a direction orthogonal to the feeding direction of the transfer feeding device, the upper mold pin and the lower mold pin are transferred. Interference with the feeder is avoided. Thus, the upper mold slide stroke can be reduced. Therefore, the drawing process can be completed in a short time without moving the upper die at high speed. Therefore, it is not difficult to operate the drawing machine so as to follow the speed of the upper die. In addition, since the speed of the upper die does not increase, it is possible to prevent the drawn product from generating heat due to friction with the inner peripheral surface of the machining hole of the upper die. That is, the productivity of a drawn product can be improved at the same drawing speed as before.

  In the invention according to claim 3, since the upper die pin and the lower die pin are arranged on both sides in the direction orthogonal to the feeding direction of the transfer feeding device, it is possible to perform a predetermined operation with the lower die in a balanced manner. it can.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing apparatus of the drawn product which can improve productivity, and the manufacturing method of a drawn product can be provided.

Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
As shown in FIG. 1B, a motor as a rotating electrical machine includes a yoke 1 as a drawn product. As shown in FIGS. 1A and 1B, the yoke 1 is formed in a flat bottomed cylindrical shape, and includes two flat portions 5 that are parallel to each other and curved portions that connect the two flat portions 5 to each other. 6 is provided. Magnets 2 are fixed inside the curved portion 6 of the yoke 1. Inside the magnet 2, an armature (armature) 4 having a rotating shaft 3 is rotatably accommodated.

Next, a manufacturing apparatus for the yoke 1 will be described.
As shown in FIG. 2, the yoke 1 manufacturing apparatus manufactures the yoke 1 by performing multi-stage drawing on a workpiece 1 a made of a metal plate with a transfer press 11 as a multi-stage drawing machine. Is for. The transfer press 11 performs various processes such as a drawing process for forming the side wall (flat part 5 and curved part 6) of the work 1a, a process for forming the bottom part of the yoke 1, and a forming process for forming the final shape of the yoke 1. It is like that. The transfer press 11 includes a plurality of aperture devices including a first aperture device 12, a second aperture device 13, and a third aperture device 14.

  Further, the transfer press 11 includes a transfer feeding device 15 for feeding the workpiece 1a to the next process step by step in the order of the first drawing device 12, the second drawing device 13, and the third drawing device 14. The two feed bars 16 included in the transfer feeding device 15 are arranged in parallel to each other along the feeding direction and pass through a plurality of throttling devices including the first to third throttling devices 12 to 14. Each feed bar 16 is provided with the same number of fingers 17 as the throttle device. Each finger 17 is arranged in a state of being spaced apart at equal intervals in the feeding direction. The fingers 17 provided on one feed bar 16 and the fingers 17 provided on the other feed bar 16 are arranged so as to face each other and sandwich the workpiece 1a.

  Both feed bars 16 perform a rectangular motion that is symmetrical to each other. Specifically, both feed bars 16 are configured to clamp the workpiece 1a (in the direction of arrow F1 in FIG. 2), feed direction (in the direction of arrow F2 in FIG. 2), and release the workpiece 1a (indicated by the arrow in FIG. 2). F3 direction) and the return direction (the direction of arrow F4 in FIG. 2) which is the opposite direction to the feed direction. Movement in the feed direction and the return direction is performed by driving a transfer drive mechanism (not shown) by an output from the transfer press 11. The movement in the direction of clamping the workpiece 1a and the direction of releasing the clamping of the workpiece 1a is performed by driving a feed bar opening / closing mechanism (not shown) by an output from the transfer press 11.

  As shown in FIG. 3, the first diaphragm device 12 includes a lower mold 20a and an upper mold 20b supported above the lower mold 20a so as to be vertically movable. In addition, the structure of other aperture devices such as the second aperture device 13 and the third aperture device 14 is different from that of the first aperture only in that the outer diameter of the punch 27 and the inner diameter of the processing hole 43 of the die 42 are slightly different. Since the configuration is almost the same as that of the device 12, the description thereof is omitted here.

  A flat backing plate 23 is placed and fixed on the lower mold base 21, and a punch holder 24 is placed and fixed on the backing plate 23. A punch support hole 26 penetrating the punch holder 24 in the thickness direction is provided in the center portion of the punch holder 24, and forms a rod shape standing on the backing plate 23 through the punch support hole 26. A base end (lower end) portion of the punch 27 is supported. Incidentally, the outer diameter of the punch 27 is set so that the inner diameter of the workpiece 1a after the drawing process in the first drawing device 12 is a predetermined inner diameter.

  On the punch holder 24, a cylinder portion 25 is provided so as to cover the periphery of the punch 27 and open at the upper end. In the cylinder part 25, a cushion plate 28 for placing the workpiece 1a is arranged so as to be movable along the axial direction of the cylinder part 25 and the punch 27. A flange portion 29 is formed on the outer peripheral portion of the cushion plate 28 so as to extend toward the inner peripheral surface side of the cylinder portion 25. When the cushion plate 28 moves toward the opening end side of the cylinder portion 25, the flange portion 29 comes into contact with a stopper 25 a protruding from the inner peripheral surface of the opening end portion (upper end portion) of the cylinder portion 25. Thus, the upward movement of the cushion plate 28 is restricted.

  A punch insertion hole 30 that penetrates the cushion plate 28 in the thickness direction is provided in the central portion of the cushion plate 28. As shown in FIG. 4A, a guide cylinder 31 is disposed in the punch insertion hole 30 so as to be movable along the axial direction of the cylinder portion 25 and the punch 27. In FIG. 3, the guide cylinder 31 is omitted to prevent the drawing from being complicated. The outer peripheral surface of the guide tube 31 is in contact with the inner peripheral surface of the punch insertion hole 30, and the inner peripheral surface of the guide tube 31 is in contact with the outer peripheral surface of the punch 27. One end of a rod 31 a is in contact with the lower end of the guide tube 31. The other end of the rod 31a passes through the punch holder 24, the backing plate 23 and the lower mold base 21 shown in FIG. 3, and is connected to the main cushion 33a of the die cushion 33 shown in FIG. 4 (a). Yes. Thereby, gas pressure, such as air in the main cushion 33a, is set to a predetermined pressure, and the rod 31a and the guide cylinder 31 are pressed upward by the gas pressure.

  As shown in FIG. 3, one end of a cushion bar 32 is in contact with the cushion plate 28. The other end of the cushion bar 32 passes through the punch holder 24, the backing plate 23, and the lower mold base 21, and is fixed to a support plate 34 provided on the sub-cushion 33b of the die cushion 33 shown in FIG. ing. A gas pressure such as air in the sub-cushion 33b is set to a predetermined pressure, and the support plate 34 and the cushion rod 32 are pressed upward by the gas pressure.

  As shown in FIG. 3, the support plate 34 extends in a direction (left and right direction in FIG. 3) perpendicular to the feed direction (the direction orthogonal to the paper surface in FIG. 3) of the transfer feeding device 15. Two lower mold pins 35 are provided at both ends of the support plate 34. Each lower mold pin 35 is disposed outside the transfer feeding device 15 in a direction orthogonal to the feeding direction of the transfer feeding device 15. Each lower mold pin 35 penetrates the lower mold base 21 and protrudes by the same height toward the upper mold 20b. A pin support portion 35 a for supporting the tip of a killer pin 47 described later is formed at the tip of each lower mold pin 35. Each lower mold pin 35 comes into contact with the killer pin 47 in the axial direction.

  On the other hand, the upper die 20b is held by a slider (not shown) of the transfer press 11, and the slider moves in the vertical direction by the driving force of a driving device (not shown) provided on the transfer press 11, so that the lower die 20a It comes to come in contact with and away from. A die holder 41 is fixed to the lower mold 20a side of the upper mold base 22, and a die 42 is fixed to the lower mold 20a side of the die holder 41. The die 42 is used for drawing the workpiece 1a by moving in a direction in which the die 42 contacts and separates from the lower mold 20a. In the present embodiment, the movement amount (slide stroke) from the top dead center to the bottom dead center of the die 42 is set to three times the height of the workpiece 1a. As will be described later, each killer pin 47 and each lower mold pin 35 are arranged outside the transfer feeding device 15 in a direction orthogonal to the feeding direction of the transfer feeding device 15 to prevent interference with the feeding device 15. It is because it has been. Thereby, the movement amount (slide stroke) from the top dead center to the bottom dead center of the die 42 can be set to three times the height of the workpiece 1a.

  A processing hole 43 into which the punch 27 can be inserted with a predetermined gap is provided in the central portion of the die 42. The inner diameter of the processing hole 43 is set so that the outer diameter of the workpiece 1a after being processed by the die 42 becomes a predetermined inner diameter. That is, the outer diameter of the workpiece 1a before being processed by the die 42 is set smaller. In addition, a curved surface portion 44 having a predetermined radius of curvature and gradually increasing the inner diameter of the processing hole 43 as it goes to the lower mold 20a side is formed in the end opening of the processing hole 43 on the lower mold 20a side. .

  As shown in FIG. 4A, a pressing pin 45 is accommodated in the processing hole 43 (omitted in FIG. 3). The pressing pin 45 is for pressing the work 1a through a pressing block 46 provided on the lower mold 20a side of the pressing pin 45. The pressing pin 45 is movable relative to the die 42 along the axial direction of the processing hole 43.

  As shown in FIG. 3, in the direction orthogonal to the feed direction of the transfer feeding device 15 (the direction perpendicular to the plane of the paper in FIG. 3) (in the horizontal direction of the plane of the paper in FIG. 3), Two killer pins 47 as upper mold pins are provided. Each killer pin 47 is arranged outside the transfer feeder 15 in a direction (left and right direction in FIG. 3) perpendicular to the feeding direction (paper surface orthogonal direction in FIG. 3) of the transfer feeder 15. Each killer pin 47 protrudes toward the lower mold 20a by the same height. The tip of each killer pin 47 is positioned below the upper end of the transfer feeder 15. Each killer pin 47 comes into contact with each pin support portion 35a of each lower mold pin 35 in the axial direction. Each killer pin 47 pushes down the sub-cushion 33b shown in FIG. At the same time, the cushion plate 28 connected to the sub-cushion 33b is lowered, and the workpiece 1a on the cushion plate 28 is lowered from the transfer position where it can be transferred by the transfer feeding device 15 to the machining position. .

Next, a method for manufacturing the yoke 1 will be described.
The yoke 1 is manufactured by subjecting a work 1a made of a metal plate to multistage drawing. Specifically, as shown in FIG. 2, the work 1a is conveyed in the order of the first drawing device 12, the second drawing device 13, and the third drawing device 14, and the drawing work is performed on the workpiece 1a in each drawing device. Applied. The first to third squeezing devices 12 to 14 have substantially the same configuration, and the outer diameter of the punch 27 and the inner diameter of the machining hole 43 of the die 42 are slightly different.

  As shown in FIG. 4A, the workpiece 1a processed by the die 42 of the first drawing device 12 is formed in a bottomed cylindrical shape in the previous step. At this time, the work 1a is sandwiched between the fingers 17 (see FIG. 2).

  When the clamping of the workpiece 1a by the finger 17 is released and the die 42 (upper die 20b) at the top dead center is lowered (moved to the lower die 20a side), as shown in FIG. The lower end of the lower die pin 35 abuts on the pin support portion 35 a of the lower die pin 35, and the killer pin 47 pushes down the sub cushion 33 b via the lower die pin 35. Accordingly, the cushion plate 28 connected to the sub cushion 33b is also lowered. When the die 42 is further lowered in this state, as shown in FIG. 4C, the workpiece 1a is lowered to the machining position, and the punch 27 and the guide cylinder 31 are inserted into the workpiece 1a. The curved surface portion 44 comes into contact with the bottom portion 1b of the workpiece 1a. Further, the pressing pin 45 moves to the lower mold 20 a side, and the bottom 1 b of the workpiece 1 a is pressed against the upper end surface of the punch 27 by the pressing block 46. The punch 27 and the die 42 (working hole 43) have a smaller diameter than that used in the previous step.

  When the die 42 is further lowered from this state, the workpiece 1a is press-fitted into the machining hole 43 of the die 42 as shown in FIG. At this time, as the die 42 is lowered, the guide cylinder 31 is lowered via the workpiece 1a. Since the inner diameter of the processing hole 43 is smaller than the outer diameter of the workpiece 1a before processing, the workpiece 1a is compressed by being press-fitted into the processing hole 43 and drawn, and both the inner and outer diameters are reduced. Further, when the work 1a is press-fitted into the machining hole 43 of the die 42, the die 42 and the guide cylinder 31 are lowered while the work 1a is sandwiched between the curved surface portion 44 of the die 42 and the upper end portion of the guide cylinder 31. The work 1a extends from the bottom 1b toward the opening.

  When the die 42 reaches bottom dead center (see FIG. 4 (e)), both feed bars 16 (see FIG. 2) of the transfer feeder 15 are moved in the return direction (the direction of arrow F4 in FIG. 2). Start moving.

  When the die 42 is lifted (moved to the side away from the lower mold 20a) from the state where drawing of the workpiece 1a as shown in FIG. 4 (e) has been completed, the main cushion 33a rises due to gas pressure. As shown in FIG. 5A, the guide cylinder 31 and the work 1a rise, and the punch 27 comes out of the work 1a. When the die 42 is further raised, the lower die pin 35 is raised by the gas pressure of the sub-cushion 33b as shown in FIG. 5 (b). Then, as shown in FIG. 5C, the workpiece 1 a comes out of the machining hole 43 and the killer pin 47 is separated from the pin support portion 35 a of the lower die pin 35.

  At the same time as the die 42 moves up, both feed bars 16 (see FIG. 2) of the transfer feeding device 15 move in a direction (arrow F1 direction in FIG. 2) to sandwich the work 1a. Then, as shown in FIG. 5C, when the die 42 reaches the top dead center, the workpiece 1a is clamped by the fingers 17 provided on both feed bars 16, and one drawing process is completed. In addition, while one drawing process is completed, both feed bars 16 of the transfer feeder 15 release the workpiece 1a in the direction (in the direction of arrow F3 in FIG. 2) and the return direction (in the direction of arrow F4 in FIG. 2). ) And the direction in which the workpiece 1a is sandwiched (in the direction of arrow F1 in FIG. 2).

  Then, as shown in FIG. 2, the work 1 a sandwiched by the fingers 17 is conveyed from the first expansion device 12 to the second expansion device 13. When the work 1a is drawn by the second drawing device 13, the work 1a is transferred to the third drawing device 14, and the work 1a is drawn again by the third drawing device 14. . The drawing process includes a plurality of processes. As the process proceeds, the work 1a is deep-drawn by using the die 42 in which the diameter of the machining hole 43 is reduced and the curvature of the curved surface portion 44 is reduced.

Then, after all the drawing steps are completed, the yoke 1 as shown in FIGS. 1A and 1B is manufactured through a forming step for forming the detailed shape of the yoke 1.
In the manufacturing apparatus of the yoke 1 having such a configuration, each killer pin 47 and each lower mold pin 35 are arranged outside the transfer feeding device 15 in a direction orthogonal to the feeding direction of the transfer feeding device 15. 47 and the lower mold pin 35 are prevented from interfering with the transfer feeder 15. The drawing is performed in a state where the lower end of the killer pin 47 is always disposed below the upper end of the transfer feeding device 15.

  Therefore, the die 42 (upper die 20b), which is necessary to avoid interference with the fingers 17 of the transfer feeder 15 since the killer pin 47 is disposed so as to pass through the inside of the transfer feeder 15 in the past. The amount of movement (slide stroke) becomes smaller. Specifically, the slide stroke of the die 42, which is conventionally set to be four times or more the height of the workpiece 1a, can be three times the height of the workpiece 1a in the present embodiment. Therefore, the drawing process can be completed in a short time without moving the die 42 at a high speed. Therefore, it is not difficult to operate a driving device (not shown) provided in the transfer press 11 so as to follow the speed of the die 42. Further, since the speed of the die 42 does not increase, the work 1a can be prevented from generating heat due to friction with the die 42. That is, the productivity of the yoke 1 can be improved at the same drawing speed as in the prior art. Specifically, the productivity of one yoke 1 can be improved to about 1.5 times the conventional one at the same drawing speed.

According to the above embodiment, the following effects can be obtained.
(1) Since each killer pin 47 and each lower die pin 35 are arranged outside the transfer feeder 15 in a direction orthogonal to the feeding direction of the transfer feeder 15, the killer pin 47 and the lower die pin 35 are transferred to the transfer feeder. Interfering with 15 is avoided. Therefore, the die 42 (upper die 20b), which is necessary to avoid interference with the fingers 17 of the transfer feeder 15 since the killer pin 47 has been disposed so as to pass through the inside of the transfer feeder 15 in the past. The amount of movement (slide stroke) becomes smaller. Specifically, the slide stroke of the die 42, which has been set to be four times or more the height of the conventional work 1a, can be three times the height of the work 1a. Therefore, the drawing process can be completed in a short time without moving the die 42 at a high speed. Therefore, it is not difficult to operate a driving device (not shown) provided in the transfer press 11 so as to follow the speed of the die 42. Further, since the speed of the die 42 does not increase, it is possible to prevent the workpiece 1a from generating heat due to friction with the inner peripheral surface of the processing hole 43 of the die 42. That is, the productivity of the yoke 1 can be improved at the same drawing speed as in the prior art. Specifically, the productivity of one yoke 1 can be improved to about 1.5 times the conventional one at the same drawing speed.

  (2) Since the killer pin 47 and the lower die pin 35 are arranged on both sides in the direction orthogonal to the feeding direction of the transfer feeding device 15, the killer pin 47 balances the operation of pushing down the sub cushion 33b via the lower die pin 35. It can be done well.

In addition, you may change the said embodiment as follows.
In the embodiment, two lower mold pins 35 are provided at both end portions of the support plate 34, and two killer pins 47 are provided at both end portions of the upper mold base 22. However, the number of lower mold pins 35 and killer pins 47 may be changed.

  In the above embodiment, the transfer press 11 is used to manufacture the yoke 1 of the motor, which is a drawn product, but may be used to produce other drawn products.

Next, the technical idea that can be grasped from the above embodiment will be described below.
(A) A manufacturing apparatus for a yoke of a rotating electric machine that forms a bottomed cylindrical shape by subjecting a workpiece, which is sent to the next process step by step by a transfer feeding device, to a bottomed cylindrical shape, wherein the drawing machine The upper die of the processing machine is lowered so as to be close to the lower die in order to perform the drawing process on the workpiece, and the upper die pin provided on the upper die is moved based on the lowering of the upper die. The lower mold pin provided on the lower mold is pressed and lowered to cause the lower mold to perform a predetermined operation before the drawing starts, and the upper mold pin and the lower mold The apparatus for producing a yoke of a rotating electrical machine, wherein the mold pin is arranged outside the transfer feeding device in a direction orthogonal to the feeding direction of the transfer feeding device.

  (B) A method of manufacturing a yoke of a rotating electric machine that forms a bottomed cylindrical shape by subjecting a workpiece, which is sent to the next process stepwise by a transfer feeding device, to a bottomed cylindrical shape, wherein the drawing machine In order to perform drawing on the workpiece, the upper die of the processing machine is lowered so as to be close to the lower die, and the lower die is provided by an upper die pin provided on the upper die based on the lowering of the upper die. The lower mold pin provided on the mold is pressed and lowered to cause the lower mold to perform a predetermined operation before the drawing process starts, and the upper mold pin and the lower mold pin are connected to the transfer feeding device. A method for manufacturing a yoke of a rotating electrical machine, wherein drawing is performed in a state of being arranged outside the transfer feeding device in a direction perpendicular to the feeding direction.

(A) is a perspective view of a motor, (b) is the sectional view on the AA line of Fig.1 (a). The schematic plan view of a transfer press. FIG. 3 is a schematic front sectional view of a transfer press. (A) is the BB sectional drawing of FIG. 3, (b)-(e) is explanatory drawing of a transfer press. (A)-(c) is explanatory drawing of a transfer press.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Yoke as a drawn product, 1a ... Workpiece, 11 ... Transfer press as drawing machine, 15 ... Transfer feeder, 20a ... Lower die, 20b ... Upper die, 27 ... Punch, 35 ... Lower die pin, 42 ... Die, 43 ... Processed hole, 47 ... Killer pin as upper die pin.

Claims (4)

An apparatus for producing a drawn product that forms a substantially bottomed cylindrical shape by subjecting a workpiece sent to the next process stepwise by a transfer feeder to a multi-stage drawing process by a multi-stage drawing machine. ,
The transfer feeding device includes a pair of feed bars arranged along the feeding direction of the workpiece, each of the feed bars is provided with a finger, and the fingers are arranged so as to face each other between the two feed bars. The work can be clamped,
The drawing machine lowers the upper die of the processing machine so as to be close to the lower die in order to draw the workpiece, and is provided on the upper die based on the lowering of the upper die. The lower mold is configured so that the lower mold performs a predetermined operation before the drawing process starts by pressing and lowering the lower mold pin provided on the lower mold with the upper mold pin.
The upper die pin and the lower die pin are arranged outside the finger and feed bar of the transfer feeding device in a direction orthogonal to the feeding direction of the transfer feeding device. apparatus. The upper die is provided with a die having a machining hole, and the lower die is provided with a punch inserted into the machining hole,
The lower mold is operated to insert the workpiece into the punch before the drawing process starts by pressing and lowering the lower mold pin with the upper mold pin based on the lowering of the upper mold. The apparatus for producing a drawn product according to claim 1.   The apparatus for producing a drawn product according to claim 1 or 2, wherein the upper mold pin and the lower mold pin are arranged on both sides in a direction orthogonal to a feeding direction of the transfer feeding device. . Stepwise by a transfer feeding device that is provided in each of a pair of feed bars arranged along the feeding direction of the workpiece and is configured so that the workpiece can be clamped by fingers arranged so as to face each other between the two feed bars. The workpiece to be sent to the next process is a method of manufacturing a drawn product that is formed into a substantially bottomed cylindrical shape by performing multi-stage drawing with a drawing machine provided in multiple stages,
The drawing machine lowers the upper die of the processing machine so as to be close to the lower die in order to draw the workpiece, and the upper die provided on the upper die based on the lowering of the upper die By pressing and lowering the lower mold pin provided on the lower mold with a pin, the lower mold is allowed to perform a predetermined operation before the drawing process starts,
The drawing is performed in a state where the upper die pin and the lower die pin are arranged outside the finger and feed bar of the transfer feeding device in a direction orthogonal to the feeding direction of the transfer feeding device. Manufacturing method of drawn products.

Images