JP2009285717A - Spring plunger unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spring plunger unit in which the height position of the pin of a spring plunger is adjusted easily. <P>SOLUTION: The spring plunger unit 1 includes the spring plunger 10, a holder 20 and a plate 40. The spring plunger 10 has a cylindrical body 11 of which the outer circumferential face is provided with a male screw thread 11a. The holder 20 is a hollow cylindrical body and has a flange 21 on one end thereof in the axial direction. A female screw thread 22 is formed on the inner circumferential face of the holder 20 and the cylindrical body 11 of the spring plunger 10 is inserted into and screwed to the hollow section 23 so that the spring plunger 10 is retained. The plate 40 has a through-hole 41 where a stage 41a is formed. The holder 20 is inserted through the through-hole 41 in a state of receiving the flange 21 of the holder 20 at the stage 41a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a spring plunger unit used, for example, to eject a press-formed product in a press die.

For example, a spring plunger unit used for jumping out a press-formed product in a press die is conventionally known. In the one shown in Patent Document 1, a pressing plate is overlapped with a base plate and fixed with bolts. A cylinder containing a coil spring and a pin is erected on the pressing plate, and the tip side of the pin is cylindrical with a coil spring. And an attachment hole penetrating over the base plate and the pressing plate is formed.
Registered Utility Model No. 3059531

  By the way, in the spring plunger unit of patent document 1, the cylinder is erected on the pressing plate by engaging the flange portion of the cylinder with the stepped portion of the pressing plate and fixing the pressing plate to the base plate with bolts. However, such bolt fixing has a disadvantage that the height position of the pin cannot be easily adjusted. In other words, the height position of the pins cannot be adjusted unless the bolts are removed and the pins and cylinders are replaced with different lengths.

  The present invention has been made in view of the above points, and an object of the present invention is, for example, in a spring plunger unit used to jump out a press-molded product in a press mold, and a height position of a pin of the spring plunger. It is to adjust easily.

  A first aspect of the present invention is a spring plunger having a male threaded portion formed on the outer peripheral surface of a cylindrical body, and a hollow cylindrical body, wherein a flange is formed on one end side in the cylindrical axis direction, and a female threaded portion is formed on the inner peripheral surface. A holder for holding the spring plunger by inserting and screwing the spring plunger cylinder into the hollow portion and a through hole in which a step portion is formed are provided, and the flange portion of the holder is formed by the step portion. And a plate through which the holder is inserted in the through hole.

  Accordingly, the spring plunger is held in the holder by inserting and screwing the cylindrical body of the spring plunger into the hollow portion of the holder, so the spring plunger is held in the holder by changing the screwing position of the cylindrical body with respect to the holder. The position can be adjusted easily. Therefore, the height position of the pin of the spring plunger can be easily adjusted.

  According to a second invention, in the first invention, further comprising positioning means for positioning the spring plunger with respect to the holder.

  As a result, the spring plunger is positioned with respect to the holder by the positioning means, so that the holding position of the spring plunger with respect to the holder can be adjusted easily and accurately. Therefore, the height position of the pin of the spring plunger can be adjusted easily and accurately.

  According to a third invention, in the second invention, the positioning means is a nut that is externally fitted to the cylindrical body of the spring plunger and positions the spring plunger with respect to the holder by contacting the holder. It is characterized by having.

  Thereby, the spring plunger is positioned with respect to the holder by abutting the nut fitted and fitted to the cylindrical body of the spring plunger with the holder, so by changing the screwing position of the nut with respect to the cylindrical body, The holding position of the spring plunger relative to the holder can be easily and accurately adjusted. Therefore, the height position of the pin of the spring plunger can be easily and accurately adjusted with a simple structure.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the through hole is provided on one end side in the longitudinal direction of the plate, and one end portion in the longitudinal direction of the plate is formed in a semicircular shape. It is characterized by being.

  As a result, one end in the longitudinal direction of the plate is formed in a semicircular shape, so that the spring plunger unit can be placed in a narrow space and obstruct other members as compared with the case where the one end is formed in a rectangular shape. It can be attached so that it does not become.

  According to the present invention, the spring plunger is held in the holder by inserting and screwing the cylindrical body of the spring plunger into the hollow portion of the holder. Therefore, by changing the screwing position of the cylindrical body with respect to the holder, The holding position with respect to the holder can be easily adjusted, and the height position of the pin of the spring plunger can be easily adjusted.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a partial cross-sectional view showing a spring plunger unit 1 according to an embodiment of the present invention. For example, as shown in FIG. 2, the spring plunger unit 1 is used for jumping out a press-formed product in a press die whose detailed illustration is omitted. The spring plunger unit 1 includes a spring plunger 10, a holder 20, a nut 30, and a base plate (base retainer) 40.

  As shown in FIGS. 1 and 3, the spring plunger 10 includes a cylindrical body 11, a coil spring 12, and a pin 13. The cylinder 11 is a hollow cylindrical body, and one end side in the cylinder axis direction (upper end side in FIG. 3) is open, while the other end side in the cylinder axis direction (lower end side in FIG. 3) is a blocking member. 14 is occluded. Hereinafter, one end in the cylinder axis direction of the cylinder 11 is referred to as an open end of the cylinder 11 and the other end in the cylinder axis direction is referred to as a closed end. On the inner peripheral surface of the cylindrical body 11, an annular step portion 11 a extending inward in the cylindrical radial direction is formed on the open end side. A male thread portion 11 b is formed on the outer peripheral surface of the cylindrical body 11 over the entire region in the cylindrical axis direction excluding the closed end portion of the cylindrical body 11.

  The coil spring 12 is accommodated in the hollow portion 11 c of the cylindrical body 11. The pin 13 is a cylindrical body, and is accommodated on the cylinder 11 open end side of the coil spring 12 in the hollow portion 11 c of the cylinder 11. The pin 13 protrudes outward from the open end of the cylindrical body 11 in a state where no pressure is applied to the distal end side (the upper end side in FIG. 3). The tip of the pin 13 is formed in a hemispherical shape. An annular flange 13a extending radially outward is formed on the outer peripheral surface of the pin 13 on the end side (the lower end side in FIG. 3), and the flange 13a and the step 11a of the cylindrical body 11 are formed. By engaging, the pin 13 is prevented from falling off the cylinder 11. The pin 13 is pushed into the cylindrical body 11 against the urging force of the coil spring 12 when a pressure is applied to the distal end side thereof, for example, by closing a press die. On the other hand, the pin 13 pushed into the cylindrical body 11 jumps out of the cylindrical body 11 by the urging force of the coil spring 12 when the pressure on the distal end side is released by, for example, opening the press die. Thereby, a press-formed product can be paid out.

  As shown in FIGS. 1 and 4, the holder 20 is a hollow cylindrical body. On the outer peripheral surface of the holder 20, an annular flange 21 extending outward in the cylinder radial direction is formed on one end side in the cylinder axis direction (lower end side in FIG. 4). Hereinafter, the other end in the cylinder axis direction (the upper end in FIG. 4) of the holder 20 opposite to the one end in the cylinder axis direction is referred to as the tip of the holder 20. A female screw portion 22 is formed on the inner peripheral surface of the holder 20 over the entire region in the cylinder axis direction. The cylindrical body 11 of the spring plunger 10 is inserted into the hollow portion 23 of the holder 20 from the distal end side thereof, and the male screw portion 11b of the cylindrical body 11 is screwed to the female screw portion 22. Thus, the holder 20 holds the spring plunger 10 by inserting and screwing the cylindrical body 11 of the spring plunger 10 into the hollow portion 23 of the holder 20.

  As shown in FIG. 1, the nut 30 is externally fitted to the cylinder 11 of the spring plunger 10 and is screwed into the male screw portion 11 b of the cylinder 11. When the cylindrical body 11 of the spring plunger 10 is inserted and screwed into the holder 20, the cylindrical body 11 is held in the holder until the nut 30 that is externally screwed into the cylindrical body 11 comes into contact with the front end surface of the holder 20. 20 is inserted. As described above, when the nut 30 comes into contact with the holder 20, the cylindrical body 11 can not enter the holder 20 any more and is held at that position. That is, the nut 30 functions as a positioning means for positioning the spring plunger 10 with respect to the holder 20. Thus, the holding position of the spring plunger 10 with respect to the holder 20 can be easily adjusted by changing the screwing position of the nut 30 with respect to the cylindrical body 11.

  As shown in FIGS. 1 and 5, the base plate 40 is a plate-like body extending in one direction. Hereinafter, this one direction is referred to as a longitudinal direction. One end portion in the longitudinal direction of the base plate 40 (left end portion in FIG. 5) is formed in a semicircular shape. The other part of the base plate 40 excluding one end in the longitudinal direction is formed in a rectangular shape. The corner of the other longitudinal end of the base plate 40 (the right end in FIG. 5) is formed in a quarter circle. A circular first through hole 41 penetrating in the thickness direction is provided on one end side in the longitudinal direction of the base plate 40, and a circular second through hole 42 for attaching a press die penetrating in the thickness direction on the other end side in the longitudinal direction. Are provided respectively.

  An annular step 41a extending radially inward is formed on the inner peripheral surface of the first through-hole 41 by increasing the hole diameter on the side of one opening end (the lower opening end in FIG. 5). Has been. The hole diameter of the portion on the one opening end side of the first through hole 41 is larger than the outer diameter of the flange portion 21 of the holder 20, while the hole diameter of the portion on the other opening end (upper opening end in FIG. 5) side is The outer diameter of the flange 21 is smaller. The holder 20 is inserted into the first through-hole 41 in a state in which the flange portion 21 is received by the step portion 41a by inserting the holder 20 from the tip end side thereof from the one opening end side.

  An annular step 42a extending radially inward is formed on the inner peripheral surface of the second through hole 42 by increasing the hole diameter on the side of one opening end (the upper opening end in FIG. 5). ing. In the second through hole 42, a bolt 44 (shown only in FIG. 2) is inserted from the one opening end side from the tip end side thereof, so that the head portion of the bolt 44 is received by the stepped portion 42 a. The bolt 44 is inserted.

  As shown in FIG. 2, the base plate 40 has a bolt inserted through the second through hole 42 with the holder 20 inserted through the first through hole 41 and the pin 13 of the spring plunger 10 facing upward. For example, it is attached to the lower die 50 by being inserted and screwed into the bolt hole 50a of the lower die 50 of the press die. Thus, since the base plate 40 is directly fixed to the lower mold 50, the spring plunger unit 1 according to the present embodiment does not require a conventional plate overlapping structure, and can be easily fixed to the lower mold 50. it can.

  When the spring plunger 10 is replaced with a different element (winding direction, number of threads, thread groove shape / diameter / pitch) defining the male threaded portion 11b of the cylindrical body 11, the holder 20 is replaced with the replaced spring. Replace with one corresponding to the plunger 10. That is, by preparing a plurality of spring plungers 10 having different elements that define the male threaded portion 11b of the cylinder 11 and a plurality of holders 20 corresponding to the respective spring plungers 10, compatibility between the spring plunger 10 and the holder 20 is achieved. Can be secured.

  Hereinafter, a method for attaching the spring plunger unit 1 to the press mold will be briefly described. First, the holder 20 is inserted into the first through hole 41 of the base plate 40. Next, the spring plunger 10 in which the nut 30 is externally screwed into a predetermined position of the cylindrical body 11 is inserted and screwed into the holder 20 inserted into the base plate 40 until the nut 30 comes into contact with the holder 20. Then, in the state as it is, the base plate 40 is attached to the press die with the bolts 44 inserted into the second through holes 42. Thereby, the attachment of the spring plunger unit 1 to the press die is completed.

-Effect-
As described above, according to the present embodiment, the spring plunger 10 is held by the holder 20 by inserting and screwing the cylindrical body 11 of the spring plunger 10 into the hollow portion 23 of the holder 20. By changing the screwing position, the holding position of the spring plunger 10 with respect to the holder 20 can be easily adjusted. Therefore, the height position of the pin 13 of the spring plunger 10 with respect to the inner surface of the cavity of the press die, for example, can be easily adjusted.

  Further, since the spring plunger 10 is positioned with respect to the holder 20 by bringing the nut 30 externally screwed into the cylindrical body 11 of the spring plunger 10 into contact with the holder 20, the nut 30 is screwed into the cylindrical body 11. By changing the position, the holding position of the spring plunger 10 with respect to the holder 20 can be easily and accurately adjusted. Therefore, the height position of the pin 13 of the spring plunger 10 can be easily and accurately adjusted with a simple structure.

  Further, since one end portion in the longitudinal direction of the base plate 40 is formed in a semicircular shape, the spring plunger unit 1 is placed in a narrow space as compared with the case where this one end portion is formed in a rectangular shape. It can be attached so that it does not become.

  In this embodiment, the spring plunger unit 1 is attached to the lower mold, but not limited to this, for example, it may be attached to the upper mold.

(Embodiment 2)
As shown in FIGS. 6 and 7, the spring plunger unit 1 according to the present embodiment includes two spring plungers 10, 10, three holders 20, 20, 20, two nuts 30, 30, and a base plate 40. And a collective base plate 43. In addition, in this spring plunger unit 1, the same code | symbol is attached | subjected about the same structure as the spring plunger 1 of Embodiment 1. FIG. Further, although the detailed illustration of the spring plunger unit 1 according to the present embodiment is omitted, with the bolt 13 inserted into the second through hole 42 of the base plate 40 with the pin 13 of the spring plunger 10 facing downward, For example, it is attached to the upper die of a press die.

  On the outer peripheral surface of each holder 20, a wrench recess 24 is formed. Thus, the spring plunger 10 and the bolt 44 can be easily inserted and screwed into the holder 20 by applying a spanner to the recess 24.

  The collective base plate 43 is a deformed body formed in a U-shape, and is provided with a first through hole 41 at both ends in the extending direction and a second through hole 42 for mounting the base plate 40 at the center. .

  Bolts 44 inserted through the second through holes 42 of the assembly base plate 43 are inserted and screwed into the holder 20 inserted through the first through holes 41 of the base plate 40. FIG. 6 shows a state before the bolt 44 is inserted and screwed into the holder 20 of the base plate 40.

  The spring plunger 10 is inserted and screwed into the holder 20 inserted into each first through hole 41 of the assembly base plate 43. These spring plungers 10 are positioned with respect to the holder 20 by nuts 30.

  A cover member 45 that covers and closes the open end of each first through hole 41 on the base plate 40 side is attached to the surface of the collective plate 43 on the base plate 40 side (the upper side in FIG. 6).

-Effect-
As described above, according to the present embodiment, substantially the same effects as those of the first embodiment can be obtained.

  Further, since the spring plunger unit 1 has a two-stage structure of the base plate 40 and the collective base plate 43, even if the space near the base plate 40 is narrow, the spring plunger unit 1 having two spring plungers 10 is used as another member. Can be installed so as not to get in the way.

  In the present embodiment, the collective base plate 43 is formed in a U-shape, but is not limited thereto. For example, as shown in FIG. 8, the collective base plate 43 is formed in a cross shape, the first through holes 41 are formed at both ends in the longitudinal direction of the first straight portion 43a, and the second straight portion 43b orthogonal to the first straight portion 43a. The first through hole 41 may be formed on one end side in the longitudinal direction of the first and the second through holes 42 for attaching the base plate 40 may be formed on the other end side. That is, the spring plunger unit 1 including such a collective base plate 43 includes three spring plungers 10.

  Moreover, in this embodiment, although the spring plunger unit 1 is attached to the upper mold | type, it is not restricted to this, For example, you may attach to a lower mold | type.

  Further, in the present embodiment, the spring plunger unit 1 has a two-stage upper and lower structure of the base plate 40 and the collective base plate 43, and the base plate 40 is attached to the upper die by a bolt inserted into the second through hole 42. However, as long as space permits, the spring plunger unit 1 may have a one-step upper and lower structure of the collective base plate 43, and the collective base plate 43 may be attached to the upper die by a bolt inserted through the second through hole 42.

(Other embodiments)
In each said embodiment, although the nut 30 comprises the positioning means which concerns on this invention, it is not restricted to this. For example, as shown in FIG. 9, a screw hole 25 penetrating in the cylinder radial direction is formed in the holder 20, and the spring plunger 10 is positioned with respect to the holder 20 by a screw 31 inserted through the screw hole 25. May be. That is, in this case, the screw hole 25 and the screw 31 constitute positioning means.

  Moreover, in each said embodiment, the use of the spring plunger unit 1 is not limited to jumping out of the press molded product in a press die. The spring plunger unit 1 according to the present invention can be widely applied to uses such as lifting a product, dispensing a scrap, and pressing a press-formed product.

  Furthermore, in each of the above embodiments, when the spring plunger 10 is screwed into or removed from the holder 20, the holder 20 and the base plate 40 or the collective base plate 43 may be relatively rotated around the cylinder axis. Alternatively, a detent means for making the relative rotation of the assembly base plate 43 non-rotatable may be provided. When such a detent means is provided, when the spring plunger 10 is attached to and detached from the holder 20, the holder 20 and the base plate 40 or the collective base plate 43 do not rotate relative to each other, and the height position of the pin 13 of the spring plunger 10 is further increased. Easy to adjust.

  Hereinafter, an example in which the rotation preventing means is provided on the base plate 40 will be described. Specifically, as shown in FIG. 10, a notch 21 a is formed in a part of the flange portion 21 of the holder 20, and a stopper 41 b is provided at a portion corresponding to the notch 21 a in the first through hole 41 of the base plate 40. Form. When the spring plunger 10 is screwed into or removed from the holder 20, the notch 21a and the stopper 41b are engaged to prevent the holder 20 and the base plate 40 from rotating relative to each other. In FIG. 10, the stopper 41 b is formed on the other end side in the longitudinal direction of the first through hole 41, but this is only an example, and one end side in the longitudinal direction of the first through hole 41 and one end side in the short direction. It may be formed anywhere, such as the other end side in the short direction.

  The present invention is not limited to the embodiments, and can be implemented in various other forms without departing from the spirit or main features thereof.

  As described above, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. The scope of the present invention is defined by the claims, and is not limited by the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the spring plunger unit according to the present invention can be applied to an application for easily adjusting the height position of the pin of the spring plunger.

It is a fragmentary sectional view showing the spring plunger unit concerning the embodiment of the present invention. It is the schematic which shows the state which attached the spring plunger unit to the lower mold | type of the press metal mold | die. It is sectional drawing which shows a spring plunger. It is a figure which shows a holder, (a) is a top view, (b) is a side view. It is a figure which shows a base plate, (a) is a top view, (b) is a side view. It is a side view which shows the modification of a spring plunger unit. It is a top view which shows an assembly | attachment baseplate. It is a top view which shows the modification of an assembly | attachment baseplate. It is sectional drawing which shows the modification of a positioning means. It is a figure which shows a rotation prevention means, (a) is a top view of a holder, (b) is a bottom view of a base plate, (c) is sectional drawing of a part of spring plunger unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Spring plunger unit 10 Spring plunger 11 Tubular body 11a Male thread part 12 Spring 13 Pin 20 Holder 21 ridge part 22 Female thread part 23 Hollow part 25 Screw hole (positioning means)
30 Nut (positioning means)
31 Screw (positioning means)
40 Base plate
41 1st through-hole (through-hole)
41a Step part 43 Collective base plate (plate)

Claims (4)

A spring plunger having an external thread formed on the outer peripheral surface of the cylindrical body;
A hollow cylindrical body having a flange formed on one end in the cylinder axial direction, an internal thread formed on the inner peripheral surface, and the spring plunger cylinder inserted and screwed into the hollow. A holder for holding the plunger;
A spring plunger unit comprising: a through hole in which a step portion is formed, and a plate through which the holder is inserted into the through hole in a state where the step receives the flange portion of the holder. . The spring plunger unit according to claim 1, wherein
A spring plunger unit further comprising positioning means for positioning the spring plunger with respect to the holder. The spring plunger unit according to claim 2,
The positioning means has a nut that is externally screwed into the cylindrical body of the spring plunger and positions the spring plunger relative to the holder by contacting the holder. . In the spring plunger unit according to any one of claims 1 to 3,
The through hole is provided on one end side in the longitudinal direction of the plate,
One end of the plate in the longitudinal direction is formed in a semicircular shape.

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