JP6281918B2 - Press machine and manufacturing method of press-processed product - Google Patents

Description

  The present invention relates to a press machine that presses the tip of a cylindrical workpiece from the inside with a punch while the cylindrical workpiece is pressed into the die hole provided in the die from the tip side, and a method for manufacturing a press-processed product. .

  Conventionally, in this type of press machine, a cylindrical workpiece is pressed into a die hole by punching (for example, see Patent Document 1).

JP 2007-260740 A (see FIGS. 2 and 4)

  However, in the conventional press described above, the punch may be damaged. As the cause of the damage, when the cylindrical workpiece is inserted into the die hole, it is inclined to increase the insertion resistance, or the punch is not inserted into the cylindrical workpiece but abuts against the end face of the cylindrical workpiece. Can be mentioned. In particular, in the case of a long and thin cylindrical workpiece, the tip end portion of the punch is thin and long, so that breakage can frequently occur.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a press machine in which a punch is not easily damaged and a method for manufacturing a press-processed product.

In order to achieve the above object, the invention of claim 1 is characterized in that the cylindrical workpiece is pushed from the inside with a punch while the cylindrical workpiece is pushed into the die hole provided in the die from the tip side. In a press machine that presses and presses, a workpiece abutting portion that is disposed at the back of the die hole and abuts against a tip end portion of the cylindrical workpiece, a punch insertion hole into which the punch can be inserted, and the An assist tool that moves linearly with respect to the punch, and the assist tool includes a first tool component that abuts the cylindrical workpiece in an axial direction of the cylindrical workpiece, and the first tool component that includes the first tool component. A second tool component that is supported so as to be capable of reciprocating in the axial direction of the cylindrical workpiece; and the first tool component is provided between the first tool component and the second tool component. Pressure reaction force received from a workpiece Becomes an elastic member elastically deformed I, the tip portion of the cylindrical workpiece is pushed the cylindrical workpiece on the die holes from abutting on the workpiece abutment by the assist tool, the punch In the press machine, the press work is performed by pressing the punch against a tip portion of the cylindrical workpiece by being inserted into the cylindrical workpiece from the punch insertion hole.

According to a second aspect of the present invention, the punch insertion hole penetrates the first tool component and the second tool component and is provided on the die side in the punch insertion hole of the second tool component. A workpiece fitting portion to which a proximal end portion of the cylindrical workpiece is fitted; and a cylindrical shape formed in the first tool component portion; the inner side forms the punch insertion hole; and the second tool component portion the punch insertion holes said die and by linear motion in a state of being fitted from the opposite side, is a press according to claim 1, and a pressing cylinder unit which presses the cylindrical workpiece with the distal end surface of the .

According to a third aspect of the present invention, a tool accommodating portion for accommodating the first tool constituting portion so as to be linearly movable is provided at an end portion or an intermediate portion of the punch insertion hole of the second tool constituting portion, and the tool accommodating portion. The press machine according to claim 2 , wherein a compression coil spring accommodated in a compressed state is provided as the elastic member between the inner surface of the tool and the first tool component.

The invention of claim 4
Punch that allows the punch to be inserted in a press machine that presses the tip of the cylindrical workpiece from the inside with a punch while the cylindrical workpiece is pushed into the die hole of the die from the tip side. An assist tool having an insertion hole and moving linearly with respect to the punch is provided, and the cylindrical work is pushed into the die hole by the assist tool, and then the punch is inserted into the cylindrical work from the punch insertion hole. A press machine for plunging, wherein the assist tool has a workpiece fitting portion in which an end portion of the punch insertion hole is enlarged in a stepped shape and a base end portion of the cylindrical workpiece is fitted. provided, wherein by pressing the cylindrical workpiece by the step surface of the workpiece engaging portion is press write Mpu less machine to the die hole.

The invention of claim 5, wherein the punch is a pressing machine according to any one of claims 1 to 4, inrush said by being guided by the punch insertion hole into the cylinder shape workpiece.

The invention of claim 6 is a press machine in which a cylindrical workpiece is pressed from the tip side into a die hole provided in the die, and the tip of the cylindrical workpiece is pressed from the inside with a punch and pressed. An assist tool having a punch insertion hole through which the punch can be inserted and moving linearly with respect to the punch is provided, and the cylindrical work is pushed into the die hole by the assist tool, and then the punch is inserted into the punch insertion hole. And a clamper for clamping the cylindrical workpiece and holding it on the die hole, and locking the clamper to the base end surface of the cylindrical workpiece. And a base end locking portion, and after pressing the cylindrical workpiece, the assist tool is moved backward relative to the punch and the cylindrical workpiece to assist the assist. A gap is formed between the tool and the cylindrical workpiece, the cylindrical workpiece is clamped by the clamper, and the base end locking portion is locked to the base end surface of the cylindrical workpiece, Help-less machine sampling the punch from the cylindrical workpiece.

A seventh aspect of the present invention is the invention according to any one of the first to sixth aspects, wherein the cylindrical tool is pushed into the die hole by 30% or more of its entire length by the assist tool, and then the punch is inserted into the cylindrical work. A press according to claim 1.

The invention of claim 8, using a press machine according to any one of claims 1 to 7, by pressing the distal end portion of the cylindrical workpiece from the inside by the punch, the cylindrical workpiece It is a manufacturing method of the press-processed product which manufactures a press-processed product from.

In the press machine according to the first aspect and the press-processed product manufacturing method according to the eighth aspect , the cylindrical work is pushed into the die hole by an assist tool that has a punch insertion hole through which the punch can be inserted and moves linearly with respect to the punch. Here, since the assist tool is not inserted into the cylindrical workpiece like a punch, even if the cylindrical workpiece has an elongated shape, the assist tool is not elongated like a punch and can be strong enough not to be damaged. And since a punch is inserted with respect to the cylindrical workpiece | work of the state pushed in to die hole, it is hard to receive a load compared with the past, and damage to a punch is prevented. Moreover, since the punch is inserted into the cylindrical workpiece with the cylindrical workpiece centered in the die hole, it is possible to prevent the punch from striking the end face of the cylindrical workpiece. , Punch breakage is prevented. That is, according to the present invention, the punch is less likely to be damaged than in the prior art.

Further, Push the cylindrical workpiece by the assist tool die hole, after abuts the distal end portion of the cylindrical workpiece on the workpiece abutting part presses the punch tip of the cylindrical workpiece Runode, the tubular workpiece The punch pressing position at the tip is stabilized, and the processing quality is improved.

Further , according to the present invention , the variation in the axial length of the cylindrical workpiece (that is, the axial length) is absorbed by the reciprocating motion of the first tool component relative to the second tool component, thereby obtaining the cylindrical workpiece. The tip of the cylindrical workpiece can be brought into contact with the workpiece contact portion without applying an excessive force. As a result, the cylindrical workpiece with the axial length varying to the longer side than normal is deformed by excessive pressure between the assist tool and the workpiece contact portion, or the axial length varies to the shorter side than the normal. It is possible to prevent the occurrence of a situation in which the tip portion of the shaped workpiece does not contact the workpiece contact portion.

According to the configurations of the second and fourth aspects, the cylindrical workpiece is pushed into the die hole in a state where the base end portion is positioned at the workpiece fitting portion of the assist tool. As a result, it is possible to prevent a situation in which the cylindrical workpiece is pushed into the die hole in a tilted state, and the cylindrical workpiece is also positioned with respect to the punch, and the punch strikes the base end surface of the cylindrical workpiece. The occurrence of the situation can be surely prevented. Moreover, in the structure of Claim 3 , since the 1st tool structure part is accommodated in the tool accommodating part with which the intermediate part of the punch insertion hole of the 2nd tool structure part was directly moved, 1st and 2nd It is possible to prevent a problem that foreign matter is caught between the tool parts. Furthermore, according to the press machine of claim 5 , since the punch is guided into the punch insertion hole and enters the cylindrical workpiece, it is possible to more reliably prevent the punch from hitting the end face of the cylindrical workpiece. Can be prevented.

In the press machine according to the sixth aspect , after pressing the cylindrical workpiece, the assist tool is moved backward relative to the punch and the cylindrical workpiece to form a gap between the assist tool and the cylindrical workpiece. That is, the assist tool is pulled out from the base end portion of the cylindrical workpiece. Then, the cylindrical workpiece is sandwiched by the clamper and the base end locking portion is locked to the base end surface of the cylindrical workpiece, and the punch is removed from the cylindrical workpiece. Thus, according to the present invention, the punch and the assist tool can be smoothly detached from the cylindrical workpiece.

In the press machine according to claim 7 , since the cylindrical workpiece is pushed into the die hole with an assist tool having a higher strength than the punch, the cylindrical workpiece is easily pushed into the die hole even if the cylindrical workpiece is inclined and the insertion resistance increases. It is possible to push 30% or more of the axial length of the cylindrical workpiece, which was not possible conventionally, into the die hole. In addition, the punch tool is pushed into the cylindrical workpiece after the cylindrical workpiece has been pushed into the die hole by 30% or more of its axial length with the assist tool. , And the punch is more difficult to break. As a result, stable pressing can be performed, and processing quality is stabilized.

1 is a front view of a press according to a first embodiment of the present invention. Side view of press machine Side view of press machine Side view of press machine Side view of press machine Front sectional view of press machine Top view of assist tool Cross section of assist tool and workpiece Cross section of assist tool and workpiece Cross section of assist tool and workpiece Front sectional view of press machine Front sectional view of press machine Front sectional view of press machine Front sectional view of assist tool and workpiece of second embodiment Cross section of assist tool and workpiece Front sectional view of assist tool and workpiece of third embodiment

[First Embodiment]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows an entire press 10 according to the present invention. The press machine 10 includes a ram 12 and a bolster 13 which are vertically arranged between a pair of left and right side frames 11 and 11 so that the ram 12 contacts and separates from the upper side with respect to the bolster 13 from above. To do. A plurality of punches 20 are fixed in a horizontal row on the lower surface of the ram 12, and a plurality of dies 30 (see FIG. 2) are fixed to the bolster 13 so as to correspond to the punches 20. Then, a plurality of machining stages are constituted by a plurality of pairs of punches 20 and dies 30 that are opposed to each other in the vertical direction, and a cylindrical workpiece 91 (see FIG. 3) is sequentially formed from the leftmost machining stage to the right machining stage. The “pressed product” according to the present invention is manufactured by being conveyed and pressed.

  Specifically, in the processing stage at the left end in FIG. 1, a punch 20 punches a disk from a strip-shaped sheet metal 90 and pushes it into a die hole 30 </ b> A (see FIG. 3) of the die 30, so A cylindrical workpiece 91 is formed. Each time the ram 12 moves upward, the cylindrical work 91 is sequentially transferred to the right next processing stage by the transfer device 14 described below, and gradually becomes elongated while passing through a plurality of intermediate processing stages. It will be squeezed to become. Then, at the processing stage at the right end (hereinafter referred to as “end”), the bottom 92 of the cylindrical workpiece 91 is punched as shown in FIG. In the present embodiment, the present invention is applied to prevent breakage of the punch 20 of the terminal processing stage.

  The transfer device 14 has a pair of transfer slides 15 and 15 (see FIG. 3) that extend in the direction in which the processing stage groups are arranged and face each other with the processing stage groups interposed therebetween, and facing surfaces of the transfer slides 15 and 15. Are provided with a plurality of pairs of fingers 16 and 16 (only one set of fingers 16 and 16 is shown in FIG. 3).

  The fingers 16, 16 are supported so as to be linearly movable in a direction opposite to the transfer slides 15, 15 and are urged toward the processing stage by a coil spring 17. The pitch (interval) between adjacent fingers 16 and 16 on the transfer slides 15 and 15 is the same as the pitch between adjacent punches 20 and 20 and the pitch between dies 30 and 30. Then, the transfer slides 15 and 15 reciprocate in the longitudinal direction (direction orthogonal to the paper surface of FIG. 3) with the same stroke as the pitch.

  In the following description, the facing direction of the transfer slides 15 and 15 is appropriately referred to as “front-rear direction”, and the longitudinal direction of the transfer slide 15 is appropriately referred to as “lateral direction”.

  The tip shapes of the fingers 16 and 16 differ depending on the shape of the cylindrical workpiece 91 that changes for each processing stage. 3 and 4 show the shapes of the second fingers 16 and 16 from the end, and FIG. 5 shows the shapes of the end fingers 16 and 16. As shown in FIG. 3, the fingers 16 and 16 other than the terminal end are provided with upper end guide surfaces 16A and 16A that gradually open upward, and side guide surfaces (not shown) that gradually open in the lateral direction. It has. On the other hand, in the end fingers 16 and 16, the upper end portion of the clamping surface for clamping the cylindrical workpiece 91 protrudes in a stepped manner as shown in FIG. 5, and the step surface is a base end locking according to the present invention. Part 16K. The end fingers 16 and 16 are also provided with side guide surfaces (not shown) similar to the other fingers 16 and 16. Note that the “clamper” according to the present invention is constituted by the pair of fingers 16, 16 at the end.

  The transfer device 14 operates as follows. The transfer slides 15 and 15 move to the stroke start end side (left side in FIG. 1) and stand by while the ram 12 is positioned near the bottom dead center. Then, as the ram 12 rises, the cylindrical workpiece 91 extracted from the die hole 30A is caught and held between the fingers 16, 16, and in this state, the transfer slides 15, 15 are moved to the end side of the stroke (in FIG. 1). Move to the right).

  At this time, the end fingers 16, 16 are opened by sliding the side guide surface to a standby guide (not shown) waiting at the destination of the transfer slide 15, and the gripped cylindrical workpiece 91 is released and is not shown. Housed in a work storage box.

  Regarding the fingers 16 and 16 other than the end, the transfer slides 15 and 15 move toward the end of the stroke, thereby holding the cylindrical workpiece 91 on the die hole 30A of the adjacent processing stage. In this state, the ram 12 is lowered, and the cylindrical work 91 is pushed into the die hole 30A and pressed. In the lowering process of the ram 12, an unillustrated thimble (not shown) provided on the punch 20 or an assist tool 23 according to the invention (described later) shown in FIG. 4 slidably contacts the upper guide surfaces 16A, 16A of the fingers 16, 16. The fingers 16 and 16 are opened to release the tubular work 91. Then, the transfer slides 15 and 15 are moved to the starting end side (left side in FIG. 1) during the press working and return to the initial state. In this manner, the cylindrical workpiece 91 is sequentially conveyed from the leftmost processing stage in FIG. 1 to the right processing stage and subjected to press processing.

  The thimble described above is provided in a processing stage other than the end, is fitted to the outside of the punch 20 so as to be linearly movable and has a tapered tip, and is arranged at the origin by a fork lever 29 and a cam mechanism (not shown). Has been. Then, after the tip of the punch 20 has entered the cylindrical workpiece 91, the thimble slides on the upper guide surfaces 16 </ b> A and 16 </ b> A of the fingers 16 and 16 to expand between the fingers 16 and 16. Further, for example, when the cylindrical workpiece 91 is pushed into the die hole 30 </ b> A by the punch 20, the thimble descends while maintaining a gap between the lower surface of the cylindrical workpiece 91 and the upper surface of the cylindrical workpiece 91. Then, after the punch 20 presses the cylindrical workpiece 91, the thimble rises at the same time or earlier than the punch 20, stops temporarily at the strip position, and from the punch 20 rising from below, the cylindrical workpiece 91 is lifted. To strip. The cylindrical work 91 is gripped by the fingers 16 at the start of the strip. When the punch 20 is completely removed from the cylindrical work 91 and the strip is completed, the thimble rises and stops at the origin position.

  The assist tool 23 is provided at the terminal processing stage. 2 to 13 show a cross section of the press machine 10 at the final processing stage. Hereinafter, the detailed structure of the punch 20, the die 30 and the assist tool 23 at the final processing stage will be described.

  As shown in FIG. 3, the punch 20 has a base end large diameter portion 20 </ b> A whose diameter is increased in a stepped manner at the upper end portion, and has a shape that is gradually reduced in diameter downward. A portion from the middle position to the lower end of the punch 20 is a punch body 20B that enters the die hole 30A. Further, a sliding contact sleeve 21 made of a sliding metal is fitted in a range from the upper end portion of the punch body 20B to the lower surface of the base end large diameter portion 20A on the outside of the punch 20. The upper half of the slidable contact sleeve 21 is fixed with the punch 20 fitted in the punch support hole 12A of the ram 12, and the lower half of the slidable contact sleeve 21 is fixed. The punch main body 20 </ b> B extends downward from the lower end of the sliding contact sleeve 21.

  As shown in FIG. 5, the die 30 includes an upper die 31 and a lower die 32 that are stacked one above the other. A die hole 30A is formed in communication with the hole. Further, the center hole of the lower die 32 is smaller than the center hole of the upper die 31, and the step portion between the upper die 31 and the lower die 32 is a workpiece contact portion 30D. Then, as shown in FIG. 11B, when 30 to 40% of the axial length of the cylindrical workpiece 91 is pushed into the die hole 30A, the lower end of the cylindrical workpiece 91 (the cylindrical workpiece 91 of the present invention is The punch 20 punches out the bottom 92 of the cylindrical workpiece 91 in this state as shown in FIG. 12A. Thereby, the cylindrical workpiece 91 becomes a “pressed product” according to the present invention. The punched bottom portion 92 is accommodated in a collection box (not shown) provided below the press 10 through a discharge hole 13A communicating from below the die hole 30A.

  As shown in FIGS. 3, 6 and 7, the assist tool 23 has, for example, a prismatic base end base portion 23 </ b> C at the upper end, and the lower portion of the base end base portion 23 </ b> C is shown in FIG. 3. As shown, the tool body 23D is thinner in a stepped manner than the base end base 23C in the front-rear direction. Further, a lower end guide surface 23G is formed at the lower end portion of the tool main body portion 23D by chamfering both front and rear corner portions.

  As shown in FIG. 6, the tool main body 23D is provided with side protrusions 26 and 26 each having a lower portion protruding from both sides of the intermediate portion. Moreover, as shown in FIG. 7, each side protrusion 26 is chamfered so as to be tapered toward the side, and includes side guide surfaces 26G and 26G. Then, the above-described side guide surfaces (not shown) of the fingers 16 and 16 are brought into sliding contact with the side guide surfaces 26G and 26G of the assist tool 23 so that the space between the fingers 16 and 16 is opened.

  As shown in FIG. 6, a punch insertion hole 24 penetrates in the center of the assist tool 23 in the vertical direction. A large-diameter hole portion 23A is formed from the upper end to the lower end position in the punch insertion hole 24, and a lower-diameter hole portion having an inner diameter of approximately half of the large-diameter hole portion 23A is provided below the lower end position. The sliding contact sleeve 21 described above is fitted in the large-diameter hole 23A so as to be linearly movable as shown in FIG. In addition, the diameter below the intermediate part of the large diameter hole 23A in the axial direction is slightly expanded in a stepped shape as shown in FIG.

  The lower side from the intermediate position in the small-diameter hole portion of the punch insertion hole 24 is enlarged in a stepped shape, and the upper portion from the step surface is a punch guide portion 24G having an inner diameter that allows the punch body 20B to be just fitted. ing. Moreover, the part below the level | step difference surface is the workpiece | work fitting part 25 which concerns on this invention which has the internal diameter which the cylindrical workpiece | work 91 can just fit. And as shown in FIG. 9, the upper end part (equivalent to "the base end part" of the cylindrical workpiece 91 which concerns on this invention) of the cylindrical workpiece 91 is fitted by the workpiece fitting part 25, and a workpiece fitting part The upper surface (that is, the end surface of the base end portion) of the cylindrical workpiece 91 is in contact with the workpiece abutting portion 25D, which is a step surface at the upper end of 25. In this state, as shown in FIG. 10, the punch main body 20 </ b> B is guided by the punch guide portion 24 </ b> G and inserted into the cylindrical work 91.

  As shown in FIG. 8, a punch introduction surface 24A is formed on the punch guide portion 24G by chamfering the upper end opening edge. Further, the workpiece fitting portion 25 has a workpiece introduction surface 25A formed by gradually increasing the diameter of the lower end portion.

  In order to move the assist tool 23 linearly separately from the punch 20, a fork lever 29 is connected to the assist tool 23 as shown in FIGS. Specifically, through the base end portion 23C for the connection, through-surface grooves 23B and 23B are formed on both side surfaces facing in the lateral direction from the front end to the rear end. The tip of the fork lever 29 is divided into two forks, and the two tip portions of the fork lever 29 are formed with circular holes facing each other, and the bottomed cylindrical bushes 29A, 29A are formed in the circular holes. (See FIG. 6) is press-fitted. Pins 23 </ b> P and 23 </ b> P are rotatably fitted to the bushes 29 </ b> A and 29 </ b> A and protrude inward from the two tip portions of the fork lever 29. Of the pins 23P and 23P, these projecting inner tips are formed with flat surfaces parallel to each other at two locations in the circumferential direction of the outer peripheral surface (so-called two-sided). The space between the flat surfaces is substantially the same as the width of the groove 23B, and the inner end portions of the pins 23P and 23P are fitted into the grooves 23B and 23B so as to be slidable in the front-rear direction. As described above, the fork lever 29 is coupled to the assist tool 23 so as to receive the proximal end base portion 23C between the two distal end portions. As a result, the assist tool 23 moves linearly relative to the punch 20 in accordance with the rotation of the fork lever 29. As shown in FIG. 6, the assist tool 23 has a punch protection position where the punch guide portion 24G of the punch insertion hole 24 is positioned below the tip of the punch body 20B, and a punch protection position as shown in FIG. The punch guide portion 24G of the insertion hole 24 is fitted to the base end portion of the punch body 20B, and moves between the punch full protrusion position where the punch body 20B protrudes from the tip of the assist tool 23. The fork lever 29 is rotated by receiving power from a servo motor (not shown) which is a drive source different from the drive source for moving the ram 12 up and down, for example.

  Next, the operation of one cycle in the last processing stage will be described. In FIG. 3, when the transfer slide 15 moves to the end side of the stroke and the cylindrical workpiece 91 held by the fingers 16, 16 immediately before the end is arranged on the die hole 30 </ b> A of the end processing stage. FIG. 6 shows a state in which the press machine 10 is viewed from the lateral direction, and FIG. 6 shows a state in which the same state is viewed from the front of the press machine 10. At this time, as shown in FIG. 3, the upper end portion of the cylindrical workpiece 91 is positioned above the fingers 16, 16, the assist tool 23 is disposed at the punch protection position, and the tip of the assist tool 23 is placed on the cylindrical workpiece 91. Opposite from above. Then, the assist tool 23 and the punch 20 are lowered while the assist tool 23 is maintained at the punch protection position. Then, as shown in FIGS. 9 and 11A, the upper end portion of the cylindrical workpiece 91 is fitted into the workpiece fitting portion 25 of the assist tool 23, and the base end surface of the cylindrical workpiece 91 is the workpiece fitting portion 25. Abuts against the workpiece abutting portion 25D at the upper end of the. From there, the assist tool 23 and the punch 20 are further lowered while the assist tool 23 is maintained at the punch protection position, and the cylindrical work 91 is pushed into the die hole 30A by the assist tool 23 as shown in FIG. The lower end portion of the cylindrical workpiece 91 is pressed against the workpiece contact portion 30D. During this time, as shown in FIG. 4, the tip of the assist tool 23 is interrupted between the fingers 16 and 16, and the gripping of the cylindrical workpiece 91 by the fingers 16 and 16 is released.

  When the lower end portion of the cylindrical workpiece 91 abuts against the workpiece abutting portion 30D of the die hole 30A, the assist tool 23 stops, and only the punch 20 continues to descend, and the punch body 20B is inserted through the punch as shown in FIG. It is guided by the punch guide portion 24G of the hole 24 and enters the cylindrical work 91. Then, as shown in FIG. 12A, the tip of the punch 20 presses and punches the bottom 92 of the cylindrical workpiece 91 at a position before the punch full protruding position. During this time, the transfer slide 15 of the transfer device 14 moves toward the start end side of the stroke, and the end fingers 16 and 16 (see FIG. 5) of the transfer device 14 sandwich the lower end portion of the assist tool 23 therebetween. Wait in an open state.

  Then, as shown in FIG. 12B, after the punch 20 is stopped, only the assist tool 23 is lifted and moved to the punch full projecting position, and then the assist tool 23 and the punch are maintained while maintaining the punch full projecting position. 20 rises. Then, the cylindrical work 91 rises together with the punch 20 by frictional engagement with the punch 20, and the lower end portion of the assist tool 23 comes out between the fingers 16, 16 when it comes out of the die hole 30 </ b> A. Thereby, the cylindrical workpiece 91 is gripped between the fingers 16 and 16 (see FIG. 5), and the proximal end surface of the cylindrical workpiece 91 is brought into contact with the proximal end locking portion 16K of the finger 16 as shown in FIG. Lock. In this state, the assist tool 23 is raised and the punch 20 is raised at a faster speed, and the punch body 20B is detached from the cylindrical workpiece 91 as shown in FIG. Then, the assist tool 23 is stopped, and only the punch 20 is raised, and the assist tool 23 is disposed at the punch protection position as shown in FIG. Then, the transfer slide 15 moves to the end side of the stroke, and the end fingers 16, 16 open in contact with a standby guide (not shown) waiting at the destination of the transfer slide 15 to open and grip the cylindrical workpiece. 91 is dropped into a work storage box (not shown), and the fingers 16, 16 immediately before the end place the next cylindrical work 91 on the die hole 30A of the end processing stage to return to the initial state. .

  As described above, in the press machine 10 and the method of manufacturing a pressed product according to the present embodiment, the assist tool 23 that has the punch insertion hole 24 into which the punch 20 can be inserted and moves linearly with respect to the punch 20 has a cylindrical shape. The work 91 is pushed into the die hole 30A. Here, since the assist tool 23 is not inserted into the cylindrical workpiece 91 unlike the punch 20, even if the cylindrical workpiece 91 has an elongated shape, the assist tool 23 is not elongated like the punch 20 and has a strength that is difficult to break. be able to. Since the punch 20 is inserted into the cylindrical workpiece 91 in a state of being pushed into the die hole 30A, the punch 20 is less likely to receive a load compared to the conventional case, and damage to the punch 20 is prevented. Moreover, since the punch 20 is inserted into the cylindrical workpiece 91 with the cylindrical workpiece 91 centered in the die hole 30A, it is possible to prevent the punch 20 from hitting the upper surface of the cylindrical workpiece 91. The punch 20 is also prevented from being damaged at points. That is, according to the press machine 10 and the manufacturing method of a press-processed product of this embodiment, the punch 20 is not easily damaged. Further, since the cylindrical workpiece 91 is pushed into the die hole 30A by the assist tool 23 having a strength higher than that of the punch 20, even if the cylindrical workpiece 91 is inclined and the insertion resistance is increased, the cylindrical workpiece 91 is easily inserted into the die hole 30A. It becomes possible to push in, and 30% or more of the axial length of the cylindrical workpiece 91 that could not be made conventionally can be pushed into the die hole 30A. In addition, since the punch 20 is guided by the assist tool 23, the punch 20 can be inserted into the cylindrical work 91 more accurately. As a result, stable pressing can be performed, and processing quality is stabilized. In addition, since the cylindrical workpiece 91 is centered, when the cylindrical workpiece 91 is pulled out together with the punch 20 by frictional engagement with the punch 20, it can be pulled out with smaller resistance.

  Furthermore, since the cylindrical work 91 is pushed into the die hole 30A with its upper end positioned at the work fitting part 25 of the assist tool 23, a situation in which a large load is applied to the assist tool 23 is prevented. Moreover, since the cylindrical workpiece 91 is positioned with respect to the punch 20 by the workpiece fitting portion 25 and the punch guide portion 24G of the punch insertion hole 24, a situation in which the punch 20 hits the upper surface of the cylindrical workpiece 91 is prevented. It can be surely prevented.

[Second Embodiment]
This embodiment is shown in FIGS. 14 and 15, and only the structure of the assist tool 23V is different from the first embodiment. As shown in FIG. 14, the assist tool 23 </ b> V of the present embodiment includes an assist tool body 41 corresponding to the “second tool component” of the present invention and a floating pressing member 45 corresponding to the “first tool component”. And a compression coil spring 50 corresponding to an “elastic member”.

  The assist tool body 41 has a shape obtained by changing a part of the assist tool 23 of the first embodiment. Only the changes will be described below. The assist tool main body 41 is divided into two upper and lower parts by a dividing surface 41A provided near the upper end of the side protrusions 26, 26, and these two parts are fixed in a combined state by screws or the like not shown. The punch insertion hole 24V of the assist tool main body 41 has a first hole portion 43 having an inner diameter slightly larger than the large diameter hole portion 23A and a second hole portion 44 into which the cylindrical work 91 can be just fitted can be connected vertically. Prepare. Further, a pair of projecting piece receiving portions 42 and 42 are formed on the upper portion of the first hole portion 43 above the middle position in the vertical direction by extending two portions 180 degrees apart to the side. In the present embodiment, the “tool housing portion” according to the present invention includes a pair of protruding piece receiving portions 42, 42, a first hole portion 43, and a part of the second hole portion 44.

  The floating pressing member 45 has an inner flange 45B projecting inward from the lower end of the inner surface of the cylinder 45A whose axial length is shorter than that of the first hole 43 of the assist tool body 41, and is 180 degrees away from the intermediate portion of the outer surface of the cylinder 45A. In addition, a pair of projecting pieces 45F and 45F project in two directions. The entire inside of the floating pressing member 45 forms a punch insertion hole 47. Then, with the pair of projecting pieces 45F and 45F being received by the projecting piece receiving portions 42 and 42 of the assist tool main body 41, the cylindrical body 45A is fitted into the first hole portion 43 so that it can move straight up and down. It is supported.

  A pressing cylinder portion 46 according to the present invention protrudes from the opening edge of the punch insertion hole 47 in the lower surface of the floating pressing member 45 and is fitted in the second hole portion 44. The pressing cylinder portion 46 has a size that does not come out of the second hole portion 44 even when the floating pressing member 45 moves to the upper end of the movable stroke S (see FIG. 14). Further, the movable stroke S of the floating pressing member 45 is larger than the variation width of the axial length of the cylindrical workpiece 91 (difference between the maximum axial length and the minimum axial length that the cylindrical workpiece 91 can take due to the variation). And the lower side part from the press cylinder part 46 among the 2nd hole parts 44 becomes the workpiece | work fitting part 25 which concerns on this invention, and the upper end part of the cylindrical workpiece | work 91 is fitted here. Further, the inner portion of the inner flange 45B and the pressing cylinder portion 46 in the punch insertion hole 47 is a punch guide portion 47A similar to the punch guide portion 24G of the first embodiment, and this punch guide portion 47A is punched. 20 penetrates and is guided into the cylindrical workpiece 91.

  As in the first embodiment, a punch introduction surface 47C is formed at the upper end edge of the punch guide portion 47A, and a work introduction surface 25A is formed at the lower end edge of the workpiece fitting portion 25. In addition, the inner diameter of the cylindrical flange 45A and the portion above the inner flange 45B is substantially the same as the inner diameter of the large-diameter hole 23A of the assist tool body 41.

  The compression coil spring 50 is housed in a stretched state between each projecting piece 45F and the lower surface of the assist tool main body 41, and biases the floating pressing member 45 downward. Here, a pressing force necessary to insert the cylindrical workpiece 91 into the die hole 30A (FIG. 6) is a first pressing force, and a pressing force capable of buckling and deforming the cylindrical workpiece 91 is a second pressing force. The compression coil spring 50 is slightly bent by the first pressing force and is maximized by a pressing force smaller than the second pressing force, that is, a pressing force that cannot cause the cylindrical workpiece 91 to buckle and deform (that is, in FIG. 15). (As shown, until it moves to the upper end of the movable stroke S).

  Instead of the pair of protrusions 45F and 45F described above, an annular flange projecting laterally from the cylinder 45A is provided, and a compression coil spring inserted outside the cylinder 45A is connected to the flange and the assist tool body 41. It is good also as a structure accommodated in the tension state between the lower surfaces of.

  This completes the description of the configuration of the assist tool 23V. When the upper end portion of the cylindrical workpiece 91 is fitted into the workpiece fitting portion 25 and the assist tool 23V is lowered, the cylindrical workpiece 91 is pressed against the distal end surface 46A of the pressing cylinder portion 46 and pushed into the die hole 30A. To go. At that time, the floating pressing member 45 presses the cylindrical work 91 in a state of being slightly above the lower end position of the movable stroke S. Then, the lower end portion of the cylindrical workpiece 91 is eventually brought into contact with the workpiece contact portion 30D and positioned (see FIG. 11B).

  Here, if the axial length of the cylindrical workpiece 91 is as designed, the floating pressing member 45 is placed at an intermediate position of the movable stroke S. Further, when the axial length of the cylindrical workpiece 91 varies on the side longer than the design value, the floating pressing member 45 is positioned above the intermediate position of the movable stroke S, and the axial length of the cylindrical workpiece 91 is designed. When the value fluctuates on the shorter side than the value, the floating pressing member 45 is positioned below the intermediate position of the movable stroke S. In this state, as in the first embodiment, the punch 20 enters the cylindrical workpiece 91, and the bottom 92 of the cylindrical workpiece 91 is punched out by the punch 20 (see FIG. 12A). Thus, according to the configuration of the present embodiment, the axial length variation of the cylindrical workpiece 91 is absorbed by the vertical movement of the floating pressing member 45, and an excessive load is not applied to the cylindrical workpiece 91. The lower end portion of the cylindrical workpiece 91 can be reliably brought into contact with the workpiece contact portion 30D. Thereby, the pressing position of the punch 20 is stabilized, and the processing quality is improved. Further, in the assist tool 23V of the present embodiment, since the floating pressing member 45 is accommodated in the intermediate portion of the punch insertion hole 24V of the assist tool main body 41, the assist tool main body 41 and the floating pressing member 45 are interposed between them. It is possible to prevent a problem that foreign matter is caught.

[Third Embodiment]
This embodiment is shown in FIG. 16, and only the structure of the assist tool 23W is different from the first embodiment. As shown in FIG. 16, the assist tool 23W of the present embodiment has an upper tool component 52 (corresponding to the “second tool component” of the present invention) at a position near the lower end of the assist tool 23 of the first embodiment. The lower tool component 53 (corresponding to the “first tool component” of the present invention) is divided into two parts, and the fitting protrusion 52A protrudes from the lower surface of the upper tool component 52, while the fitting protrusion The structure is such that a fitting recess 53A into which 52A is fitted is formed on the upper surface of the upper tool component 52. A disc spring 54 (corresponding to the “elastic member” of the present invention) is received between the front end surface of the fitting protrusion 52A and the bottom surface of the fitting recess 53A, and the disc spring 54 is elastically deformed. The upper tool component 52 and the lower tool component 53 are connected by a plurality of suspension bolts 55 so that the lower tool component 53 can move linearly with respect to the upper tool component 52. The configuration of this embodiment also has the same effect as that of the second embodiment.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

  (1) Although the cylindrical workpiece 91 of the embodiment is cylindrical, the cylindrical workpiece according to the present invention is not limited to a cylinder as long as it has a cylindrical shape. It may be a cylinder with an oval cross section.

  (2) Moreover, the cylindrical workpiece 91 of the above embodiment has a cylindrical shape with one end and the bottom 92 is punched out by the punch 20. However, the cylindrical workpiece according to the present invention is a cylinder with both ends open. It may be a shape. That is, the present invention may be applied to a case in which the bottom of a cylindrical workpiece having both ends open is crushed with a punch to make it thin.

  (3) Although the assist tool 23, 23V, 23W of the above embodiment includes the workpiece fitting portion 25 into which the upper end portion of the cylindrical workpiece 91 is fitted, the workpiece is not provided with a workpiece fitting hole, and is below the assist tool. It is good also as a structure which presses a cylindrical workpiece | work with the opening edge of the punch insertion hole in an end surface, and pushes into a die hole. In this case, the assist tool may be used as a stripper that pulls out a cylindrical work that has been pressed.

  (4) In the above-described embodiment, the punch 20 enters the cylindrical work 91 after the lower end portion of the cylindrical work 91 contacts the work contact portion 30D of the die hole 30A. Alternatively, the lower end of the cylinder may enter the cylindrical workpiece 91 before contacting the workpiece contact portion 30D.

  (5) In the second and third embodiments, a part of the assist tools 23V and 23W is supported in a movable state, and the movable part is urged by the compression coil spring 50 or the like to For example, the assist tool 23 may be driven by a servo motor, and the axial length variation of the cylindrical workpiece 91 may be absorbed by the servo rigidity of the servo motor.

10 Press machine 16 Finger (clamper)
16K Base end locking part 20 Punch 23, 23V, 23W Assist tool 24, 24V, 47 Punch insertion hole 25 Work fitting part 30 Die 30A Die hole 30D Work contact part 41 Assist tool main body (second tool constituent part)
42 Projection receiving part (tool receiving part)
43 1st hole (tool receiving part)
44 2nd hole (tool receiving part)
45 Floating pressing member (first tool component)
46 Pressing cylinder part 50 Compression coil spring (elastic member)
52 Upper tool component (second tool component)
53 Lower tool component (first tool component)
54 Disc spring (elastic member)
91 Cylindrical work 92 Bottom

Claims (8)

In a press machine that presses the tip of the cylindrical workpiece from the inside with a punch while being pressed into the die hole provided in the die from the tip side,
An assist tool that is disposed at the back of the die hole and has a workpiece abutting portion against which the tip of the cylindrical workpiece is abutted, a punch insertion hole through which the punch can be inserted, and linearly moves with respect to the punch And having
The assist tool includes a first tool component that abuts on the cylindrical workpiece in the axial direction of the cylindrical workpiece, and a second tool that supports the first tool component so as to reciprocate in the axial direction of the cylindrical workpiece. A tool component, and an elastic member that is provided between the first tool component and the second tool component and elastically deforms by a pressing reaction force that the first tool component receives from the cylindrical workpiece. Prepared
The cylindrical tool is pushed into the die hole by the assist tool, the tip of the cylindrical work is abutted against the work contact portion, and then the punch is inserted into the cylindrical work from the punch insertion hole. A press machine that presses the punch against the tip of the cylindrical workpiece to perform the pressing. The punch insertion hole penetrates the first tool component and the second tool component,
A workpiece fitting portion that is provided on the die side in the punch insertion hole of the second tool component, and into which a proximal end portion of the cylindrical workpiece is fitted;
It is formed in a cylindrical shape in the first tool component, and the inner side forms the punch insertion hole and linearly moves in a state of being fitted to the punch insertion hole of the second tool component from the opposite side to the die. And a press cylinder part which presses the said cylindrical workpiece | work with a front end surface, The press machine of Claim 1. A tool accommodating portion for accommodating the first tool constituting portion so as to be linearly movable is provided at an end portion or an intermediate portion of the punch insertion hole of the second tool constituting portion, and an inner surface of the tool accommodating portion and the first tool The press machine according to claim 2, wherein a compression coil spring accommodated in a compressed state is provided as the elastic member. In a press machine that presses the tip of the cylindrical workpiece from the inside with a punch while being pressed into the die hole provided in the die from the tip side,
An assist tool having a punch insertion hole through which the punch can be inserted and moving linearly with respect to the punch is provided, and the cylindrical work is pushed into the die hole by the assist tool, and then the punch is inserted into the punch insertion hole. A press machine for rushing into the cylindrical workpiece from
The assist tool is provided with a workpiece fitting portion in which an end portion of the punch insertion hole is enlarged in a stepped shape and a base end portion of the cylindrical workpiece is fitted, and the workpiece fitting A pressing machine that presses the cylindrical workpiece with the step surface of the portion and pushes it into the die hole. The press according to any one of claims 1 to 4, wherein the punch is guided into the punch insertion hole and enters the cylindrical workpiece. In a press machine that presses the tip of the cylindrical workpiece from the inside with a punch while being pressed into the die hole provided in the die from the tip side,
An assist tool having a punch insertion hole through which the punch can be inserted and moving linearly with respect to the punch is provided, and the cylindrical work is pushed into the die hole by the assist tool, and then the punch is inserted into the punch insertion hole. A press machine for rushing into the cylindrical workpiece from
A clamper for holding the cylindrical workpiece and holding it on the die hole is provided, and the clamper is provided with a base end locking portion for locking to a base end surface of the cylindrical workpiece,
After pressing the cylindrical workpiece, the assist tool is moved backward relative to the punch and the cylindrical workpiece to form a gap between the assist tool and the cylindrical workpiece, A pressing machine that clamps the cylindrical workpiece with a clamper and locks the proximal end locking portion to the proximal end surface of the cylindrical workpiece, and extracts the punch from the cylindrical workpiece. The said assist tool pushes the said cylindrical workpiece into the said die hole 30% or more of the full length, Then, the said punch is plunged into the said cylindrical workpiece. Press machine. Using the press according to any one of claims 1 to 7, the tip of the cylindrical workpiece is pressed from the inside with the punch, and a pressed product is manufactured from the cylindrical workpiece. Manufacturing method of press-processed products.

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