JP2018089659A - Press lower mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a press lower mold higher in durability than usual, and a work molding method capable of improving the durability of the press lower mold.SOLUTION: In a press lower mold 50 of the present invention, since a tail end opening 13D is opened in the innermost part by a squeezing part 42 among a molding hole 40, lubricating oil L is applied to a side surface of a work W after passing through the squeezing part 42. Thus, a lubricant shortage can be surely eliminated when discharging the work W from the molding hole 40. Since the lubricating oil L discharged from the tail end opening 13D expands over the whole in the circumferential direction of the molding hole 40 along a first hole inner ring-shaped groove 11, the lubricating oil L can be stably applied to the whole outer peripheral surface of the work W. Thereby, slidability in the molding hole 40 becomes high, and durability of a press machine 10 is improved more than usual.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a press lower mold having a forming hole for drawing or ironing a work, and a work forming method when using such a press lower mold.

  2. Description of the Related Art Conventionally, as this type of press lower mold, there is known a technique in which a lubricant is applied to a workpiece in a forming hole in order to improve durability (for example, see Patent Document 1).

Japanese Utility Model Publication No. 56-28733 (FIG. 1)

  However, further improvement of the durability of the lower press mold has been demanded from the above-described conventional technique. In particular, in the case of performing “ironing molding”, the progress of wear is faster than in the case of performing “drawing molding”.

  This invention is made | formed in view of the said situation, and aims at provision of the workpiece shaping | molding method which can improve durability of a press lower mold | type with higher durability conventionally, and a press lower mold | type.

  In order to achieve the above object, the invention according to claim 1 is characterized in that the end of the lubricant supply passage opens on the inner surface of the forming hole where the work is drawn or ironed and the lubricant is supplied into the forming hole. In the press lower die, the lubricant supply path is a press lower die provided with a terminal opening located on the inner side of the forming hole and located on the inner side of the narrowest constricted portion.

  According to a second aspect of the present invention, in the inner surface of the molding hole, an annular groove in a hole is formed on the inner side of the minimum constricted portion so as to surround a passing region of the workpiece, and the terminal end is formed in the annular groove in the hole. The press lower die according to claim 1, wherein the opening is located.

  Invention of Claim 3 is a press lower mold | die of Claim 1 or 2, Comprising: The die | dye which has the said shaping | molding hole, and the die holder which has the die | dye receiving hole which the said die fits in, The said die | dye Is divided into a die main body having the minimum constricted portion in the axial direction of the molding hole and a spacer on the back side of the molding hole from the die main body and overlapped with each other, and the die main body and the spacer are mutually overlapped. A lower press die in which a part of the lubricant supply path is formed on at least one of the overlapping surfaces.

  According to a fourth aspect of the present invention, a pair of tapered portions whose inner diameters gradually increase toward the overlapping surfaces of the die body and the spacer are respectively provided on the inner surfaces of the die body and the spacer. The press die according to claim 3.

  According to a fifth aspect of the present invention, a part of the lubricant supply path is formed as a radial discharge path on at least one of the overlapping surfaces of the die body and the spacer, and the die body and the spacer are mutually connected. A part of the lubricant supply path is formed as an intermediate annular path between an outer edge cutout part formed by cutting out the entire outer edge part of at least one of the overlapping surfaces and the inner side surface of the die receiving hole. 5. The lower press die according to claim 3, wherein a part of the lubricant supply path is formed as an introduction path that communicates between the outer surface of the die holder and the die holder.

  A sixth aspect of the present invention is the press lower die according to the fifth aspect, wherein the discharge path farther from the discharge path close to a communication portion between the intermediate annular path and the introduction path is thicker.

  According to a seventh aspect of the present invention, an inner surface of the forming hole includes a drawing portion for drawing a workpiece and a squeezing portion as the minimum constricted portion that is located on the inner side of the drawing portion and irons and forms the workpiece. The press lower die according to any one of claims 1 to 6, wherein the lubricant supply path is provided with a terminal opening located between the throttle portion and the ironing portion. is there.

  The invention according to claim 8 has a knockout pin that is driven by the workpiece and linearly moves in the molding hole, and a lubricant is provided between the side surface of the knockout pin and the inner side surface of the molding hole. The press lower die according to any one of claims 1 to 7, wherein a lubricant discharge path for discharging the lower portion of the lubricant is formed.

  According to the ninth aspect of the present invention, after the work is pushed into the forming hole of the lower press mold and formed, a lubricant is applied to the side surface of the work at the innermost side of the forming hole from the narrowest constricted part at the back. This is a work forming method for discharging the work to the outside of the forming hole after coating.

[Invention of Claim 1]
In a general press lower mold, when the workpiece is pushed by the punch and passes through the minimum constricted portion of the forming hole, the lubricant on the side surface of the work may be scraped or scraped off by the minimum constricted portion, A lubricant shortage may occur when the workpiece is discharged from the forming hole. On the other hand, in the press lower mold of the present invention, the end opening of the lubricant supply path is arranged in the back side portion from the minimum constricted portion of the molding hole, and the lubricant is applied to the side surface of the workpiece after passing through the minimum constricted portion. Since it is applied, the shortage of lubricant when the workpiece is discharged from the forming hole can be surely eliminated, and the durability can be improved as compared with the prior art.

[Invention of claim 2]
According to the configuration of the second aspect, the lubricant discharged from the terminal opening of the lubricant supply path spreads over the entire circumferential direction of the forming hole along the in-hole annular groove. As a result, the lubricant can be stably applied to the entire outer surface of the workpiece.

[Invention of claim 3]
According to the configuration of the third aspect, the lubricant supply path can be easily formed in the die by using the overlapping surfaces of the die body and the spacer. Further, the position of the minimum constricted portion can be adjusted by adjusting the thickness of the spacer and overlapping the die body.

[Invention of claim 4]
In the lower press die according to the fourth aspect, a pair of tapered portions formed on the inner surface of the die main body and the spacer form an in-hole annular groove surrounding the workpiece passage region on the inner surface of the forming hole. And it spreads to the whole circumferential direction of a shaping | molding hole along an in-hole annular groove, and can apply | coat a lubricant to the outer surface whole periphery of a workpiece | work stably. Further, the lubricant can be smoothly taken in between the workpiece and the minimum constricted portion by the guide of the tapered portion.

[Inventions of Claims 5 and 6]
In the lower press mold according to claim 5, the lubricant is supplied to the annular groove in the hole from a plurality of discharge paths arranged radially around the forming hole, and the lubricant is stably supplied to the entire outer surface of the workpiece. be able to. Further, as in the invention of claim 6, the discharge amount of the lubricant between the discharge passages is increased by making the discharge passage farther than the discharge passage close to the communication portion between the intermediate annular passage and the introduction passage. Can be suppressed.

[Invention of Claim 7]
In the press lower mold according to claim 7, since the terminal opening of the lubricant supply path is arranged between the narrowed portion and the ironing portion on the back side thereof, and on the back side portion from the ironing portion, the entire molding hole In this case, the lubricant is applied to the workpiece, and the durability is improved.

[Invention of Claim 8]
According to the eighth aspect of the present invention, the dirty lubricant can be discharged to the outside of the forming hole through the lubricant discharge passage.

[Invention of claim 9]
In a work forming method when using a general lower press die, is the lubricant on the side of the work scraped off by the minimum constricted part when the work is pushed by the punch and passes through the minimum constricted part of the forming hole? Alternatively, it may be scraped off, and a lubricant shortage may occur when the work is pushed back to the knockout pin. On the other hand, in the work forming method of the present invention, the lubricant is applied to the side surface of the work at the back side portion from the minimum constricted portion of the forming hole, and then the work is discharged from the forming hole, so the work is discharged from the forming hole. It is possible to surely eliminate the shortage of lubricant when being performed, and it is possible to improve the durability as compared with the prior art.

Side sectional view of the press molding machine according to the first embodiment of the present invention. Enlarged side sectional view of the press lower die Perspective view of first spacer Flat cross section of the lower die Enlarged side sectional view of the lower press die with the workpiece pushed in Enlarged side cross-sectional view of the press lower die centering on the throttle part Enlarged side sectional view of the lower press die centering on the ironing part Enlarged side sectional view of the lower press die centering on the ironing part of the second embodiment Enlarged side sectional view of the lower press die centering on the ironing part of the third embodiment

[First Embodiment]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a press 10 having a lower press die 50 according to the present invention. This press machine 10 is a so-called “transfer press machine”, in which a plurality of processing stages having punches 61 and forming holes 40 are arranged in a direction perpendicular to the paper surface of FIG. 1 (hereinafter, this direction is referred to as “work transport direction”). Prepared in a row.

  The press lower mold 50 includes a plurality of dies 30 having molding holes 40, a die holder 51 that holds the dies 30, and a knockout pin 70 that will be described in detail later. A known transfer device (not shown) is attached to the upper surface of the lower press mold 50. The plurality of punches 61 are attached to the lower surface of a ram (not shown) to constitute an upper die of the press 10.

  The workpiece W is supplied to a processing stage at one end in the workpiece conveyance direction in a state of being punched out from a sheet metal, and is drawn into a cylindrical shape with one end at the processing stage. Then, the cylindrical workpiece W is sequentially transferred to the adjacent processing stage by the transfer device, and further drawn or ironed, and is formed into an elongated cylindrical shape. FIG. 1 shows a side cross section of the press machine 10 in one final processing stage in which the workpiece W has an elongated cylindrical shape among the plurality of processing stages. In addition, an unrestricted portion is formed as a tapered flange at the upper end portion of the workpiece W, and the flange is cut off in a subsequent process of the press 10.

  Hereinafter, the structure of the press machine 10 will be described in detail mainly with respect to the processing stage shown in FIG. The die holder 51 includes a holder base 53 fixed to the upper surface of the support frame 55 of the press 10 and a plurality of holder blocks 54 fixed to the holder base 53. The holder base 53 is provided with square grooves 53A extending in a direction orthogonal to the workpiece conveying direction for each processing stage, and a holder block 54 is fitted in each of the square grooves 53A.

  The holder block 54 is formed with a circular die receiving hole 52 penetrating vertically, and the cylindrical die 30 is fitted therein. The die receiving hole 52 and the die 30 both have a shape in which the upper step portion has a diameter reduced to a stepped shape. The die 30 is fitted into the die receiving hole 52 from below, and the upper and lower surfaces of the holder block 54 and the upper and lower surfaces of the die 30 are substantially flush.

  The molding hole 40 vertically penetrates the die 30 and the holder base 53 at the center of the die 30. In addition, an extension hole 55 </ b> C is formed through the support frame 55 on the extension line of the die 30. The extension hole 55C has a pin guide portion 55A whose upper end portion is slightly smaller in diameter than the molding hole 40, and a rod guide portion 55B whose diameter is larger than that of the pin guide portion 55A except for the upper end portion. A linear motion rod 73 extending from a linear motion mechanism (not shown) provided below the support frame 55 is received by the rod guide portion 55B.

  The linear motion mechanism includes, for example, a spring as a drive source, and the linear motion rod 73 moves up and down in the rod guide portion 55B in response to the biasing force of the spring. A knockout pin 70 is placed on the direct acting rod 73. The knockout pin 70 has a structure in which a flange 70F is projected from the lower end of the round bar. Further, a part of the outer surface of the knockout pin 70 is subjected to surface grinding from the upper end position to the lower end position to form a relief portion 71, and the relief portion 74 similar to the relief portion 71 is linearly moved. It is formed from the upper end of the rod 73 to the intermediate position in the vertical direction. A gap between the relief portion 71 and the inner side surface of the pin guide portion 55A and a gap between the relief portion 74 and the inner side surface of the rod guide portion 55B form the lubricant discharge path 72.

  As shown in FIG. 1, when the linear motion rod 73 is located at the bottom dead center, the upper end of the knockout pin 70 protrudes slightly above the support frame 55 and enters the molding hole 40. Further, the upper and lower end portions of the relief portion 71 and the lower end portion of the relief portion 74 are formed with curved surfaces corresponding to the turning radius of the cutting tool.

  The die 30 of the processing stage shown in FIG. 1 is formed by stacking a base liner 35, a first spacer 34, an ironing die 33, a second spacer 32, and a drawing die 31 from bottom to top. The drawing die 31 and the ironing die 33 correspond to the “die main body” according to the present invention, and are composed of, for example, a super hard material. The other components of the die 30 such as the first spacer 34 are super hard materials. Or it consists of tool steel. Further, the punch 61 provided in the processing stage of FIG. 1 has a cylindrical shape, and the outer edge portion of the lower end surface thereof is so-called R chamfered.

  As shown in FIG. 2, the inner surface of the forming hole 40 of the drawing die 31 is an upper tapered portion 31A, an intermediate cylindrical portion 31B, and a lower tapered portion 31C in order from the upper side. The upper tapered portion 31A is reduced in diameter toward the lower side, the intermediate cylindrical portion 31B has the same uniform diameter as the lower end of the upper tapered portion 31A and extends over a certain length, and the lower tapered portion 31C is the intermediate cylindrical portion 31B. The diameter is expanded downward with a very small taper angle. The portion of the aperture die 31 where the intermediate cylindrical portion 31B is formed is the aperture portion 41 according to the present invention.

  The inner side surface of the forming hole 40 of the ironing die 33 is an upper tapered portion 33A, an intermediate cylindrical portion 33B, and a lower tapered portion 33C in order from the upper side. The upper taper portion 33A is reduced in diameter downward with a smaller taper angle than the upper taper portion 31A of the aperture die 31, and the inner diameter of the upper taper portion 33A is the inner diameter of the lower end of the lower taper portion 31C of the aperture die 31. It is slightly larger. On the other hand, the inner diameter of the lower end of the upper tapered portion 33A is smaller than the inner diameter of the intermediate cylindrical portion 31B of the drawing die 31. The intermediate cylindrical portion 33B extends over a certain length with the same uniform diameter as the lower end of the upper tapered portion 33A, and the lower tapered portion 33C faces downward from the lower end of the intermediate cylindrical portion 33B with a very small taper angle. The diameter is expanded. The portion of the ironing die 33 where the intermediate cylindrical portion 33B is formed is the ironing portion 42 according to the present invention, and the inner diameter of the ironing portion 42 is the smallest in the molding hole 40. That is, the ironing portion 42 is a “minimum constriction portion” according to the present invention.

  The taper angle of the lower taper portion 33C of the ironing die 33 is slightly larger than the taper angle of the lower taper portion 31C of the drawing die 31. Further, the ironing portion 42 is disposed on the upper side of the ironing die 33, the throttle portion 41 is disposed on the lower side of the diaphragm die 31, and the axial length of the ironing portion 42 is greater than the axial length of the throttle portion 41. It is getting shorter.

  The inner surface of the molding hole 40 of the first spacer 34 has an upper tapered portion 34A at the upper end and a cylindrical portion 34B having a uniform diameter at the portion other than the upper end. The inner diameter of the cylindrical portion 34B is slightly larger than the inner diameter of the ironing portion 42, and the upper tapered portion 33A increases in diameter upward from the upper end portion of the intermediate cylindrical portion 33B. Further, the inner diameter of the upper tapered portion 34A and the inner diameter of the lower tapered portion 33C of the ironing die 33 are substantially the same. The upper taper portion 34A of the first spacer 34 and the lower taper portion 33C of the ironing die 33 form a “one pair of taper portions” according to the present invention, and serve as the “intra-hole annular groove” according to the present invention. A first in-hole annular groove 11 is formed.

  In the present embodiment, the cylindrical portion 34B of the first spacer 34 is larger than the inner diameter of the ironing portion 42, whereby the side surface of the workpiece W that has passed through the ironing portion 42 and the first spacer as shown in FIG. A clearance C <b> 1 is formed between the cylindrical portion 34 </ b> B of 34. This clearance C1 is preferably set to a size such that lubricating oil L described later does not pass through.

  The first spacer 34 is formed with a first outer tapered portion 34D corresponding to the “outer edge cut portion” of the present invention by chamfering the entire outer edge portion where the outer surface and the upper surface intersect, for example, approximately 45 degrees. Yes. Further, the first outer tapered portion 34D is larger than the upper tapered portion 34A in the vertical direction, and the lower end portion of the first outer tapered portion 34D is located at the approximate center of the ironing die 33 in the vertical direction. The portion surrounded by the first outer tapered portion 34D and the inner side surface of the die receiving hole 52 and the lower outer edge portion of the ironing die 33 is the first intermediate annular passage 13B corresponding to the “intermediate annular passage” of the present invention. It has become.

  As shown in FIG. 3, a plurality of (for example, four) discharge passages 13 </ b> C according to the present invention are radially formed on the upper surface of the first spacer 34. Each discharge path 13C has, for example, a circular arc shape in cross section, and both ends of each discharge path 13C are open to the first outer tapered portion 34D and the upper tapered portion 34A. The opening of the discharge passage 13C in the upper tapered portion 34A is the end opening 13D according to the present invention.

  As shown in FIG. 2, the inner surface of the molding hole 40 of the second spacer 32 is a cylindrical surface having a uniform inner diameter as a whole, and the inner diameter of the inner surface of the molding hole 40 of the ironing die 33 is the lower end of the molding hole 40. Stepped larger than the upper end. Then, mainly the inner surface of the second spacer 32, the inner surface of the second spacer 32, the lower taper portion 31 </ b> C of the drawing die 31, and the upper taper portion 33 </ b> A of the ironing die 33, A second in-hole annular groove 12 is formed therebetween.

  The second spacer 32 is also formed with a second outer tapered portion 32D having the same shape as the first outer tapered portion 34D of the first spacer 34. A portion surrounded by the second outer tapered portion 32D, the inner side surface of the die receiving hole 52, and the lower surface outer edge portion of the aperture die 31 is a second intermediate annular path 14B. Similarly to the discharge path 13C of the first spacer 34, a plurality of (for example, four) discharge paths 14C having a circular arc shape are formed radially on the upper surface of the second spacer 32. The opening of the discharge path 14C is a terminal opening 14D. The discharge path 14 </ b> C is deeper than the discharge path 13 </ b> C of the first spacer 34.

  The inner side surface of the molding hole 40 of the base liner 35 has a cylindrical shape with a uniform inner diameter substantially the same as that of the second spacer 32. The base liner 35 is thicker than the other components of the die 30.

  As shown in FIG. 4, the holder base 53 and the holder block 54 are formed with an introduction path 13A extending from the front outer surface of the holder block 54 to the first intermediate annular path 13B. The introduction path 13A extends, for example, horizontally and is disposed at a position shifted from the center of the molding hole 40 by about ¼ of the diameter of the first intermediate annular path 13B and connected to the first intermediate annular path 13B. The introduction passage 13A, the first intermediate annular passage 13B, and the discharge passage 13C constitute a first lubricant supply passage 13 corresponding to the “lubricant supply passage” according to the present invention. In addition, one end of a hose 13E is connected to the opening of the first lubricant supply path 13 on the front outer surface of the holder block 54 through, for example, a hose joint (not shown), and the other end of the hose 13E is connected to the flow rate adjusting valve 91A. Is connected to the lubricant supply device 90. Then, the lubricating oil L as a lubricant discharged from the lubricant supply device 90 is supplied to the first lubricant supply path 13 with the flow rate adjusted by the flow rate adjusting valve 91A, and discharged into the forming hole 40 from the end opening 13D. Is done.

  As shown in FIG. 2, in the holder base 53 and the holder block 54, the introduction of the first lubricant supply passage 13 above the introduction passage 13A is communicated with the second intermediate annular passage 14B in the same manner as the introduction passage 13A. A path 14A is formed. The introduction path 14A, the second intermediate annular path 14B, and the discharge path 14C constitute a second lubricant supply path 14 corresponding to the “lubricant supply path” according to the present invention. Further, as shown in FIG. 1, one end of a hose 14E is connected to the opening of the second lubricant supply path 14 on the front outer surface of the holder block 54 via a hose joint, and the other end of the hose 14E is connected to the opening. The lubricant supply device 90 is connected via a flow rate adjusting valve 91B. Then, the lubricating oil L discharged from the lubricant supply device 90 is supplied to the second lubricant supply path 14 with the flow rate adjusted by the flow rate adjusting valve 91B, and discharged into the forming hole 40 from the end opening 14D.

  This completes the description of the configuration of the press machine 10 of the present embodiment. Next, the effect of this press machine 10 is demonstrated. When the press machine 10 is activated and the lubricant supply device 90 is activated, a certain amount of lubricant L is fed to the first and second lubricant supply paths 13 and 14 of the processing stage shown in FIG. The lubricating oil L flowing out from the plurality of terminal openings 13D, 14D at the ends of the first and second lubricant supply passages 13, 14 is formed along the first and second in-hole annular grooves 11, 12. It becomes the state expanded to the whole circumferential direction of the hole 40.

  Further, when the press machine 10 is operated, the workpiece W is successively drawn or ironed in a plurality of processing stages to form an elongated cylindrical shape, and the transfer device extends above the forming hole 40 in the processing stage shown in FIG. Is conveyed by. At this time, the knockout pin 70 is located at the top dead center. Then, the punch 61 descends, sandwiches the bottom wall of the workpiece W with the knockout pin 70, and draws the workpiece W into the forming hole 40 (see FIG. 5).

  Specifically, a gap is formed between the inner surface of the workpiece W before reaching the narrowed portion 41 of the forming hole 40 and the outer surface of the punch 61. Then, the workpiece W is drawn by passing through the drawn portion 41 and is reduced in diameter so as to reduce the gap between the workpiece W and the punch 61. At this time, the lubricating oil L applied in the forming hole 40 of the processing stage before the processing stage of FIG. Further, when the punch 61 moves to the top dead center, the lubricating oil L in the first and second in-hole annular grooves 11 and 12 adheres to the throttle portion 41 and the upper tapered portion 31A above it. As a result, the work W is smoothly drawn in contact with the drawn portion 41.

  As shown in FIG. 6, after passing through the narrowed portion 41 of the workpiece W, it reaches the ironing portion 42 on the far side. Here, as shown in FIG. 7, the clearance C <b> 2 between the inner surface of the ironing portion 42 and the outer surface of the punch 61 is smaller than the wall thickness t <b> 1 of the workpiece W before being pushed into the ironing portion 42. As a result, when the work W passes through the ironing portion 42 and is ironed, the wall of the work W is thinned. Further, the lubricating oil L is sufficiently supplied from the second in-hole annular groove 12 to the side surface of the workpiece W immediately before reaching the ironing portion 42, so that the workpiece W smoothly slides on the ironing portion 42. As shown in FIG. 1, the punch 61 and the knockout pin 70 rise after reaching the bottom dead center, discharge the workpiece W from the forming hole 40, and deliver the workpiece W to a transfer device (not shown). Rises and leaves the workpiece W.

  By the way, in the ironing method, the workpiece W is more strongly pressed against the inner surface of the forming hole 40 than in the drawing method, and the lubricating oil L is scraped off from the outer surface of the workpiece W correspondingly (or is ironed off). For this reason, when the molded workpiece W rises in the molding hole 40 (hereinafter referred to as “when the workpiece is discharged” as appropriate), in the structure of the conventional press machine, the lubricating oil between the ironing portion 42 and the workpiece W is removed. Insufficiency can be a problem.

  On the other hand, in the press machine 10 of this embodiment, since the terminal opening 13D is opened in the back part of the forming hole 40 from the ironing part 42, the side surface of the work W after passing through the ironing part 42 is lubricated. Oil L is applied. As a result, the shortage of lubricant at the time of discharging the workpiece is reliably resolved. Further, the lubricating oil L discharged from the end opening 13D spreads over the entire circumferential direction of the molding hole 40 along the first hole annular groove 11 as described above. Lubricating oil L is applied. Moreover, since the first in-hole annular groove 11 is composed of a pair of taper portions (specifically, the lower taper portion 33C and the upper taper portion 34A), the gap between the workpiece W and the taper portion is gradually increased. The lubricating oil L is stretched by the narrowing gap and reliably adheres to the outer surface of the workpiece W. As a result, the workpiece W and the ironing portion 42 are smoothly slidably contacted with each other when the workpiece is discharged, and the durability of the press 10 can be improved as compared with the related art.

  Further, a portion of the workpiece W that is located between the narrowed portion 41 and the ironing portion 42 when the punch 61 reaches the bottom dead center can be in strong sliding contact with the narrowed portion 41 when the workpiece is discharged. Since the lubricating oil L is sufficiently applied by the second annular groove 12 in the second hole, the sliding contact is smooth.

  That is, in the press machine 10 of the present embodiment, the end openings 13D and 14D are disposed both between the narrowed portion 41 and the ironing portion 42 and at the back side portion from the ironing portion 42, so the forming hole 40 In this case, the lubricating oil L is applied to the workpiece W, the slidability is improved, and the durability is improved. Further, since the dirty lubricating oil is discharged to the outside of the molding hole 40 through the lubricant discharge path 72 shown in FIG. 1, the sliding performance in the molding hole 40 can be kept good.

  In addition, like the press 10 of this embodiment, a part (namely, discharge path 13C, 14C) of the 1st and 2nd lubricant supply paths 13 and 14 is overlapped with the components of the die 30. If it arrange | positions, some of these 1st and 2nd lubricant supply paths 13 and 14 can be formed easily. The positions of the drawing die 31 and the ironing die 33 can be easily adjusted by adjusting the thicknesses of the first and second spacers 32 and 34 in which part of the first and second lubricant supply paths 13 and 14 are formed. Can also be done.

[Second Embodiment]
As shown in FIG. 8, the first spacer 34V provided in the die 30V of the press machine of the present embodiment has a structure that does not have the upper taper portion 34A of the first embodiment. The lower tapered portion 33C of the ironing die 33 and the outer edge portion of the upper surface of the first spacer 34V constitute the first in-hole annular groove 11. This configuration also provides the same operational effects as the press machine 10 of the first embodiment.

[Third Embodiment]
As shown in FIG. 9, the first spacer 34 </ b> W provided in the die 30 </ b> W of the press machine of this embodiment does not have the upper taper part 34 </ b> A of the first embodiment, and the inner taper part 33 </ b> C of the ironing die 33 has an inner diameter. It is substantially the same as the inner diameter of the lower end of. According to this configuration, the dirty lubricating oil L can be smoothly discharged downward.

[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) In the above embodiment, the die 30 is divided, but the die may not be divided.

  (2) In the above embodiment, the die holder 51 is divided into the holder base 53 and the holder block 54, but the die holder 51 may not be divided.

  (3) In the embodiment described above, in the forming hole 40 having the narrowed portion 41 and the ironing portion 42, the ironing portion 42 is the “minimum constricted portion” according to the present invention, but in the molding hole having only the ironing portion. The ironing portion may be the “minimum constricted portion” according to the present invention, or the forming portion having only the constricted portion may be the “minimal constricted portion” according to the present invention. In addition, a portion that performs drawing and ironing at the same time may be a “minimum constricted portion” according to the present invention.

  (4) The lubricant may be continuously supplied, or the supply may be switched in conjunction with the movement of the punch.

  (5) The first in-hole annular groove 11 has a grooved section formed by the lower taper portion 33C and the upper taper portion 34A, but the groove section may be a “U” shape. It may be semicircular.

  (6) In the embodiment described above, the end openings 13D and 14D are formed in the die 30, but may be formed in the die holder 51.

  (7) In the above embodiment, the first lubricant supply path 13 is formed on the upper surface of the first spacer 34, but the lubricant supply path may be formed on the lower surface of the ironing die 33. Further, the lubricant supply path may be provided on the upper surface of the base liner 35 without providing the first spacer 34.

  (8) The lubricant is not limited to the lubricating oil L, and may be grease or soapy water.

  (9) The number of discharge paths 13C and 14C may be one, or two or more. Moreover, when there are a plurality of discharge paths 13C, they may not be arranged at equal intervals.

  (10) When a plurality of discharge passages 13C are provided, the discharge passage 13C is configured to be thicker in the discharge passage 13C farther than the discharge passage 13C near the communication portion between the first intermediate annular passage 13B and the introduction passage 13A. You may suppress the difference with the discharge amount of the lubricating oil L between them.

DESCRIPTION OF SYMBOLS 10 Press machine 11 1st hole annular groove 12 2nd hole annular groove 13 1st lubricant supply path (lubricant supply path)
13A Introducing path 13B First intermediate annular path 13C Discharging path 13D, 14D Terminal opening 14 Second lubricant supply path (lubricant supply path)
30,30V, 30W Die 31 Drawing die (die body)
31A Upper tapered portion 31B Intermediate cylindrical portion 32 Second spacer 32D Second outer tapered portion 33 Ironing die (die body)
33C Lower taper part 34, 34V, 34W First spacer (spacer)
34A Upper taper portion 34D First outer taper portion (outer edge cut portion)
40 Molding hole 41 Restriction part 42 Ironing part 50 Lower mold 51 Die holder 52 Die receiving hole 61 Punch 70 Knockout pin 72 Lubricant discharge path 90 Lubricant supply device L Lubricating oil W Workpiece

However, there is a demand for further improvement in durability with respect to the above-described conventional press die . In particular, in the case of performing “ironing molding”, the progress of wear is faster than in the case of performing “drawing molding”.

The invention of claim 4, wherein the inner surfaces of the die body and the spacer, inner diameter gradually toward the overlapping surfaces of mutual those die body and spacers are gills Bei tapered portion of a pair of enlarged diameter The press die according to claim 3.

The molding hole 40 vertically penetrates the die 30 and the holder base 53 at the center of the die 30. Further, an extension hole 55 </ b> C is formed on the extension line of the forming hole 40 in the support frame 55 so as to penetrate therethrough. The extension hole 55C has a pin guide portion 55A whose upper end portion is slightly smaller in diameter than the molding hole 40, and a rod guide portion 55B whose diameter is larger than that of the pin guide portion 55A except for the upper end portion. A linear motion rod 73 extending from a linear motion mechanism (not shown) provided below the support frame 55 is received by the rod guide portion 55B.

The inner surface of the molding hole 40 of the first spacer 34 has an upper tapered portion 34A at the upper end and a cylindrical portion 34B having a uniform diameter other than the upper end. The inner diameter of the cylindrical portion 34B is slightly larger than the inner diameter of the ironing portion 42, and the upper tapered portion 34A increases in diameter upward from the upper end portion of the cylindrical portion 34B . Further, the inner diameter of the upper tapered portion 34A and the inner diameter of the lower tapered portion 33C of the ironing die 33 are substantially the same. The upper taper portion 34A of the first spacer 34 and the lower taper portion 33C of the ironing die 33 form a “one pair of taper portions” according to the present invention, and serve as the “intra-hole annular groove” according to the present invention. A first in-hole annular groove 11 is formed.

In the present embodiment, the inner diameter of the cylindrical portion 34B of the first spacer 34 is larger than the inner diameter of the ironing portion 42, whereby the side surface of the workpiece W that has passed through the ironing portion 42 as shown in FIG. A clearance C1 is formed between the first spacer 34 and the cylindrical portion 34B of the first spacer 34. The clearance C1 is preferably set to such a size that a lubricating oil L described later does not pass through.

The first spacer 34 is formed with a first outer tapered portion 34D corresponding to the “outer edge cut portion” of the present invention by chamfering the entire outer edge portion where the outer surface and the upper surface intersect, for example, approximately 45 degrees. Yes. Further, the first outer tapered portion 34D is larger than the upper tapered portion 34A in the vertical direction, and the lower end portion of the first outer tapered portion 34D is located at the approximate center of the first spacer 34 in the vertical direction. The portion surrounded by the first outer tapered portion 34D and the inner side surface of the die receiving hole 52 and the lower outer edge portion of the ironing die 33 is the first intermediate annular passage 13B corresponding to the “intermediate annular passage” of the present invention. It has become.

As shown in FIG. 2, the inner surface of the molding hole 40 of the second spacer 32 is a cylindrical surface having a uniform inner diameter, and the inner diameter is the lower end of the molding hole 40 of the drawing die 31 and the ironing die 33. A stepped shape is larger than the upper end of the molding hole 40. Then, mainly the inner surface of the second spacer 32, the inner surface of the second spacer 32, the lower taper portion 31 </ b> C of the drawing die 31, and the upper taper portion 33 </ b> A of the ironing die 33, A second in-hole annular groove 12 is formed therebetween.

(5) Although the groove section of the first annular groove 11 in the first hole is triangular due to the lower taper portion 33C and the upper taper portion 34A, the groove cross section may be a “U” shape, It may be circular.

DESCRIPTION OF SYMBOLS 10 Press machine 11 1st hole annular groove 12 2nd hole annular groove 13 1st lubricant supply path (lubricant supply path)
13A Introducing path 13B First intermediate annular path 13C Discharging path 13D, 14D Terminal opening 14 Second lubricant supply path (lubricant supply path)
30,30V, 30W Die 31 Drawing die (die body)
31A Upper tapered portion 31B Intermediate cylindrical portion 32 Second spacer 32D Second outer tapered portion 33 Ironing die (die body)
33C Lower taper (taper)
34, 34V, 34W First spacer (spacer)
34A Upper taper part (taper part)
34D 1st outside taper part (outer edge excision part)
40 Molding hole 41 Restriction part 42 Ironing part 50 Press lower die 51 Die holder 52 Die receiving hole 61 Punch 70 Knockout pin 72 Lubricant discharge path 90 Lubricant supply device L Lubricating oil W Workpiece

The invention of claim 1 made to achieve the above object has a forming hole, and the workpiece is moved in one direction and drawn or ironed in the forming hole and then moved in the other direction. In a press lower die that is discharged from the molding hole, and an end surface of a lubricant supply path for supplying a lubricant is opened on an inner surface of the molding hole, the lubricant supply path has an inner side of the molding hole. It is a press lower mold | type provided with the terminal opening located in the back | inner side part from the smallest narrow part which became narrowest among the side surfaces.

The present invention relates to a press lower mold having a molding hole for forming or ironing squeeze the workpiece.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a press lower mold and a press lower mold that have higher durability than conventional ones.

The invention of claim 1 made to achieve the above object has a forming hole, and the workpiece is moved in one direction and drawn or ironed in the forming hole and then moved in the other direction. in the press lower mold that is discharged from the forming hole, and a lubricant supply passage for guiding the lubricant discharged from the lubricant supply apparatus to the molding hole, provided in said lubricant supply path, the molded hole the opening in the narrowest minimum constricted Okugawa portions than portions of the inner surface, to the molding hole and the first end opening for supplying the lubricant, a type lower press are provided.

Invention of Claim 2 is a press lower mold | die of Claim 1, Comprising: The die | dye which has the said shaping | molding hole, The die holder which has the die | dye receiving hole which the said die fits in, The said die | dye, In the axial direction of the forming hole, the die main body having the minimum constricted portion and the spacer on the back side of the forming hole from the die main body are divided and overlapped with each other, and the die main body and the spacer overlap each other. A part of the lubricant supply path is formed on at least one of the surfaces, and the inner diameters of the inner surfaces of the die body and the spacer are gradually increased toward the overlapping surfaces of the die body and the spacer. And a pair of tapered portions, and a cylindrical portion having an inner diameter slightly larger than the minimum constricted portion on the back side of the forming hole from the tapered portion on the inner side surface of the spacer. A.

Invention of Claim 3 is a press lower mold | die of Claim 1, Comprising: The die | dye which has the said shaping | molding hole, and the die holder which has the die | dye receiving hole which the said die fits, The said die | dye, In the axial direction of the forming hole, the die main body having the minimum constricted portion and the spacer on the back side of the forming hole from the die main body are divided and overlapped with each other, and the die main body and the spacer overlap each other. A part of the lubricant supply path is formed on at least one of the surfaces, and an inner surface of the die body is provided with a tapered portion whose inner diameter gradually increases toward the spacer, and the inner surface of the spacer Is a press lower die that is substantially the same as the inner diameter of the end portion on the large diameter side of the tapered portion of the die body.
Invention of Claim 4 is a press lower mold | die of Claim 1, Comprising: The die | dye which has the said shaping | molding hole, and the die holder which has the die | dye receiving hole which the said die fits, The said die | dye, In the axial direction of the forming hole, the die main body having the minimum constricted portion and the spacer on the back side of the forming hole from the die main body are divided and overlapped with each other, and the die main body and the spacer overlap each other. A part of the lubricant supply path is formed on at least one of the surfaces, and an inner surface of the die body is provided with a tapered portion whose inner diameter gradually increases toward the spacer, and the inner surface of the spacer Is a press lower die having an inner diameter slightly larger than the minimum constricted portion and reduced in a stepped shape from the large-diameter side end portion of the tapered portion of the die body.

According to a fifth aspect of the present invention, a part of the lubricant supply path is formed as a radial discharge path on at least one of the overlapping surfaces of the die body and the spacer, and the die body and the spacer are mutually connected. A part of the lubricant supply path is formed as an intermediate annular path between the outer edge cut portion formed by cutting out the entire circumference of at least one outer edge portion of the overlapping surface in a tapered shape and the inner side surface of the die receiving hole, The press lower die according to any one of claims 2 to 4, wherein a part of the lubricant supply path is formed as an introduction path that communicates between the intermediate annular path and the outer surface of the die holder. is there.

A sixth aspect of the present invention is the press lower die according to the fifth aspect, wherein the discharge path farther from the discharge path close to a communication portion between the intermediate annular path and the introduction path is thicker.
A seventh aspect of the present invention is the press lower die according to the fifth aspect, wherein the introduction path extends in a direction intersecting with a radial direction of the intermediate annular path in the same plane as the intermediate annular path.

According to an eighth aspect of the present invention, an inner surface of the forming hole includes a drawn portion for drawing a workpiece and an iron portion serving as the minimum constricted portion positioned on the inner side of the drawn portion for ironing and forming the workpiece. The press according to any one of claims 1 to 7 , wherein the lubricant supply path is provided with a second end opening located between the throttle portion and the ironing portion. It is a type.

The invention according to claim 9 has a knockout pin that is driven by the workpiece and linearly moves in the molding hole, and a lubricant is provided between a side surface of the knockout pin and an inner side surface of the molding hole. The press lower die according to any one of claims 1 to 8 , wherein a lubricant discharge path for discharging the lower portion is formed.

[Inventions of Claims 2 to 4 ]
According to the structure of Claims 2-4 , a lubricant supply path can be easily formed in die | dye using the mutual overlapping surface of a die main body and a spacer. Further, the position of the minimum constricted portion can be adjusted by adjusting the thickness of the spacer and overlapping the die body.

In the press lower die of claim 2 to 4, the tape supermarkets portion formed on the inner surface of the die present body or the like, is formed a hole in the annular groove surrounding the passage area of the work on the inner surface of the forming hole. And it spreads to the whole circumferential direction of a shaping | molding hole along an in-hole annular groove, and can apply | coat a lubricant to the outer surface whole periphery of a workpiece | work stably. Further, the lubricant can be smoothly taken in between the workpiece and the minimum constricted portion by the guide of the tapered portion.

[Inventions of Claims 5 to 7 ]
In the press lower mold according to claims 5 to 7 , the lubricant is supplied to the annular groove in the hole from a plurality of discharge paths arranged radially around the forming hole, and is stably applied to the entire outer surface of the workpiece. Can be supplied. Further, as in the invention of claim 7 , the discharge amount of the lubricant between the discharge passages can be increased by making the discharge passage farther than the discharge passage close to the communication portion between the intermediate annular passage and the introduction passage. Can be suppressed.

[Invention of Claim 8 ]
In the press lower mold according to claim 8 , since the second end opening of the lubricant supply path is disposed between the narrowed portion and the ironing portion on the back side thereof, and on the back side portion from the ironing portion, the molding hole As a whole, the lubricant is applied to the workpiece, and the durability is improved.

[Invention of claim 9 ]
According to the ninth aspect of the present invention, the dirty lubricant can be discharged to the outside of the forming hole through the lubricant discharge passage.

As shown in FIG. 3, a plurality of (for example, four) discharge passages 13 </ b> C according to the present invention are radially formed on the upper surface of the first spacer 34. Each discharge path 13C has, for example, a circular arc shape in cross section, and both ends of each discharge path 13C are open to the first outer tapered portion 34D and the upper tapered portion 34A. The opening of the discharge path 13C in the upper tapered portion 34A is the first end opening 13D according to the present invention.

The second spacer 32 is also formed with a second outer tapered portion 32D having the same shape as the first outer tapered portion 34D of the first spacer 34. A portion surrounded by the second outer tapered portion 32D, the inner side surface of the die receiving hole 52, and the lower surface outer edge portion of the aperture die 31 is a second intermediate annular path 14B. Similarly to the discharge path 13C of the first spacer 34, a plurality of (for example, four) discharge paths 14C having a circular arc shape are formed radially on the upper surface of the second spacer 32. The opening of the discharge path 14C is a second end opening 14D. The discharge path 14 </ b> C is deeper than the discharge path 13 </ b> C of the first spacer 34.

As shown in FIG. 4, the holder base 53 and the holder block 54 are formed with an introduction path 13A extending from the front outer surface of the holder block 54 to the first intermediate annular path 13B. The introduction path 13A extends, for example, horizontally and is disposed at a position shifted from the center of the molding hole 40 by about ¼ of the diameter of the first intermediate annular path 13B and connected to the first intermediate annular path 13B. The introduction passage 13A, the first intermediate annular passage 13B, and the discharge passage 13C constitute a first lubricant supply passage 13 corresponding to the “lubricant supply passage” according to the present invention. In addition, one end of a hose 13E is connected to the opening of the first lubricant supply path 13 on the front outer surface of the holder block 54 through, for example, a hose joint (not shown), and the other end of the hose 13E is connected to the flow rate adjusting valve 91A. Is connected to the lubricant supply device 90. Then, the lubricating oil L as the lubricant discharged from the lubricant supply device 90 is supplied to the first lubricant supply passage 13 with the flow rate adjusted by the flow rate adjusting valve 91A, and the inside of the molding hole 40 from the first end opening 13D. To be discharged.

As shown in FIG. 2, in the holder base 53 and the holder block 54, the introduction of the first lubricant supply passage 13 above the introduction passage 13A is communicated with the second intermediate annular passage 14B in the same manner as the introduction passage 13A. A path 14A is formed. The introduction path 14A, the second intermediate annular path 14B, and the discharge path 14C constitute a second lubricant supply path 14 corresponding to the “lubricant supply path” according to the present invention. Further, as shown in FIG. 1, one end of a hose 14E is connected to the opening of the second lubricant supply path 14 on the front outer surface of the holder block 54 via a hose joint, and the other end of the hose 14E is connected to the opening. The lubricant supply device 90 is connected via a flow rate adjusting valve 91B. The lubricating oil L discharged from the lubricant supply device 90 is supplied to the second lubricant supply path 14 with the flow rate adjusted by the flow rate adjusting valve 91B, and discharged into the forming hole 40 from the second end opening 14D. The

This completes the description of the configuration of the press machine 10 of the present embodiment. Next, the effect of this press machine 10 is demonstrated. When the press machine 10 is activated and the lubricant supply device 90 is activated, a certain amount of lubricant L is fed to the first and second lubricant supply paths 13 and 14 of the processing stage shown in FIG. The lubricating oil L flowing out from the first and second terminal openings 13D and 14D at the ends of the first and second lubricant supply passages 13 and 14 flows into the first and second in-hole annular grooves 11 and 12. Along the entire circumference in the circumferential direction of the molding hole 40.

On the other hand, in the press machine 10 of this embodiment, since the 1st terminal opening 13D is opening in the back | inner side part from the ironing part 42 among the shaping | molding holes 40, the side surface of the workpiece | work W after passing the ironing part 42 Lubricating oil L is applied to the surface. As a result, the shortage of lubricant at the time of discharging the workpiece is reliably resolved. Further, the lubricating oil L discharged from the first end opening 13D spreads over the entire circumferential direction of the forming hole 40 along the first in-hole annular groove 11 as described above. Then, the lubricating oil L is applied. Moreover, since the first in-hole annular groove 11 is composed of a pair of taper portions (specifically, the lower taper portion 33C and the upper taper portion 34A), the gap between the workpiece W and the taper portion is gradually increased. The lubricating oil L is stretched by the narrowing gap and reliably adheres to the outer surface of the workpiece W. As a result, the workpiece W and the ironing portion 42 are smoothly slidably contacted with each other when the workpiece is discharged, and the durability of the press 10 can be improved as compared with the related art.

That is, in the press 10 of the present embodiment, the first and second end openings 13D and 14D are disposed both between the narrowed portion 41 and the ironing portion 42 and at the back side portion from the ironing portion 42. Therefore, the lubricating oil L is applied to the workpiece W in the entire molding hole 40, the slidability is improved, and the durability is improved. Further, since the dirty lubricating oil is discharged to the outside of the molding hole 40 through the lubricant discharge path 72 shown in FIG. 1, the sliding performance in the molding hole 40 can be kept good.

(6) Although the first and second end openings 13D and 14D are formed in the die 30 in the above embodiment, they may be formed in the die holder 51.

DESCRIPTION OF SYMBOLS 10 Press machine 11 1st hole annular groove 12 2nd hole annular groove 13 1st lubricant supply path (lubricant supply path)
13A Inlet path 13B First intermediate annular path 13C Discharge path 13D First end opening 14D Second end opening 14 Second lubricant supply path (lubricant supply path)
30,30V, 30W Die 31 Drawing die (die body)
31A Upper tapered portion 31B Intermediate cylindrical portion 32 Second spacer 32D Second outer tapered portion 33 Ironing die (die body)
33C Lower taper (taper)
34, 34V, 34W First spacer (spacer)
34A Upper taper part (taper part)
34D 1st outside taper part (outer edge excision part)
40 Molding hole 41 Restriction part 42 Ironing part 50 Press lower die 51 Die holder 52 Die receiving hole 61 Punch 70 Knockout pin 72 Lubricant discharge path 90 Lubricant supply device L Lubricating oil W Workpiece

Claims (9)

In a press lower mold in which the end of the lubricant supply path is opened on the inner surface of the molding hole where the work is drawn or ironed, and the lubricant is supplied into the molding hole.
The press lower die | dye with which the said lubricant supply path is equipped with the terminal opening located in the back | inner side part from the narrowest narrow part which became narrowest among the inner surfaces of the said shaping | molding hole.   An in-hole annular groove is formed on the inner side surface of the forming hole on the inner side of the minimum constricted portion so as to surround a passing region of the workpiece, and the end opening is located in the in-hole annular groove. Item 2. A press lower die according to Item 1. The press lower die according to claim 1 or 2, comprising a die having the forming hole and a die holder having a die receiving hole into which the die is fitted,
In the axial direction of the molding hole, the die is divided into a die main body having the minimum constricted portion and a spacer on the back side of the molding hole from the die main body and overlapped with each other,
A lower press mold in which a part of the lubricant supply path is formed on at least one of the overlapping surfaces of the die body and the spacer.   4. The pair of tapered portions each having an inner diameter that gradually increases toward the overlapping surfaces of the die body and the spacer, respectively, on each inner surface of the die body and the spacer. Press lower mold. A part of the lubricant supply path is formed as a radial discharge path on at least one of the overlapping surfaces of the die body and the spacer,
A part of the lubricant supply path is an intermediate ring between an outer edge cut portion formed by cutting an entire outer edge portion of at least one of the overlapping surfaces of the die body and the spacer and an inner side surface of the die receiving hole. Formed as a road,
The press lower die according to claim 3 or 4, wherein a part of the lubricant supply path is formed as an introduction path that communicates between the intermediate annular path and the outer surface of the die holder.   The press lower mold according to claim 5, wherein the discharge path farther from the discharge path close to a communication portion between the intermediate annular path and the introduction path is thicker. The inner surface of the forming hole is provided with a drawing part for drawing a work, and a squeezing part as the minimum constricted part for ironing and forming the work on the back side from the drawing part,
The lower press die according to any one of claims 1 to 6, wherein the lubricant supply path is provided with a terminal opening located between the throttle portion and the ironing portion. It has a knockout pin that follows the workpiece and moves directly in the molding hole,
The lubricant discharge path for discharging the lubricant below the knockout pin is formed between the side surface of the knockout pin and the inner surface of the molding hole. The press lower die according to the item.   After forming the work by pushing the work into the forming hole of the lower press mold, the lubricant is applied to the side surface of the work at the innermost part of the forming hole from the narrowest constricted part, and then the forming is performed. Work forming method that discharges the work outside the hole

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