KR101103895B1 - Mold for press work and press work method - Google Patents

Abstract

When a mold having a lubricating oil passage and an injection hole is used together with water or a water-based lubricating liquid, the tip of the pierce punch and the burring punch is formed due to lack of lubrication. The male mold 1 and the female mold 2, which fit together and cut the material, are fitted together to prevent the burring punch from breaking. Lubricating fluid in which a lubricating liquid is stored in the superposition | surface peripheral surface 13a of the superposition | polymerization part of the metal mold | die 1 overlapping at the time, or the inner peripheral surface 24a of the superposition | polymerization part of the female mold 2 By forming all or part of the storage part 10, sufficient lubricating liquid was supplied to a cut part, and the lack of lubrication at the time of cutting of a material was eliminated.

Description

Mold for press processing and press processing method {MOLD FOR PRESS WORK AND PRESS WORK METHOD}

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a partially enlarged longitudinal sectional view of a die for piercing and burring according to a first embodiment of the present invention.

FIG. 2 is a partially enlarged longitudinal sectional view showing a state at the time of fitting of the piercing / burring die shown in FIG. 1. FIG.

Fig. 3 is a partially enlarged longitudinal sectional view showing a state at the time of separation of the piercing / burring die shown in Fig. 1.

Fig. 4 is a drawing SEM image showing the shape of the mold when piercing is carried out using the piercing / burring die according to the first embodiment of the present invention.

Fig. 5 is a partially enlarged longitudinal sectional view of a piercing / burring die according to a second embodiment of the present invention.

6 is a partially enlarged longitudinal sectional view of a pierce punch according to a third embodiment of the present invention.

The figure which shows the example of the various lubricating liquid storage part formed in the metal mold | die of the metal mold | die for press working by this invention.

8 is a diagram showing an example in which a lubricating liquid passage for supplying lubricating liquid is provided on a stripper plate of a lower mold in the mold for press working according to the present invention.

9 is a diagram showing an example in which a lubricating liquid passage for supplying lubricating liquid is provided in a die button of an upper mold in the mold for press working according to the present invention.

The figure which shows the example which installed the lubricating liquid path which supplies a lubricating liquid in the burring punch in the metal mold | die for press work by this invention.

The figure which shows the fin process and the plate pin which becomes a product.

12 is a longitudinal sectional view of a conventional piercing / burring die.

FIG. 13 is a SEM photograph showing the shape of a mold when piercing is performed using the piercing / burring die shown in FIG. 12. FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

1: Pierce punch (mold) 2: Burring punch (female)

10: lubricant storage portion 13a: outer peripheral surface of the polymerization portion

15: distal end 17: donation

24a: inner peripheral surface of the polymerized portion 26: distal end portion

31: lubricant passage 33: axial passage

35: branch passage 37: collision wall

51: chamfer

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a die for press working used for cutting or punching metal plates and the like, and in particular, a die for press working used for the production of fins for use in heat exchangers such as a cooler and a die It relates to a press working method.

Conventionally, the fin used for heat exchangers, such as an automobile cooler and a room air conditioner, is manufactured by the press process shown to FIG. 11 (a). This press work mainly includes a preforming process for making it easier to process a metal plate such as aluminum to be processed, and a piercing and burring (trimming burring) for carrying out burring while drilling a preformed metal plate. ) Process, an ironing process for forming a collar from the protruding portion around the hole drilled in the metal plate, and a reflare process for bending the tip of the formed collar. Is done. By performing such press working on a metal plate such as aluminum, a plate fin as shown in Fig. 11B is manufactured.

In such press working, lubrication of the metal mold and the metal plate is important for improving the processing performance. The prior art regarding lubrication in press working is disclosed in, for example, Japanese Patent Application Laid-Open No. 7-112227 (Patent Document 1) and Japanese Patent Application Laid-Open No. 61-102323 (Patent Document 2). These conventional techniques will be described later.

Currently, hydrocarbon-based lubricating oil is used for lubrication in press working for producing fins for heat exchangers and the like. Hydrocarbon-based lubricating oils have been widely used as lubricating liquids that are good for the global environment because they differ from the mineral oil-based lubricating oils that have been used before, and are not required to be cleaned with an organic chlorine-based solvent.

When press working is performed using a hydrocarbon type lubricant, in view of the production efficiency of the fin, the lubricant oil attached to the fin after the process is heated and evaporated to dryness. In order to avoid the release of the evaporated hydrocarbon-based lubricating oil into the air, it is necessary to carry out the treatment by catalytic combustion. In addition, the hydrocarbon-based lubricating oil used in the press working and recovered as a liquid requires predetermined disposal as industrial waste. In such a situation, when hydrocarbon-based lubricating oil is used, enormous costs have been incurred in post-treatment such as catalytic combustion and disposal as industrial waste. In addition, the global environmental protection trend is increasing, and the use of environmentally friendly lubricating liquid is further desired.

(Patent Document 1)

Japanese Patent Application Laid-Open No. 7-112227

(Patent Document 2)

JP-A-61-102323

In recent years, technology development for using water and the water-based lubricating liquid which melt | dissolved the water-soluble lubricant in water instead of hydrocarbon type lubricating oil for metal processing, such as cutting, is progressing. If water or an aqueous lubricating liquid can be used for lubrication at the time of press working, it is considered that treatment by catalytic combustion and waste disposal as industrial waste can be reduced, so that good production can be realized for the natural environment. In addition, it is considered that by reducing the post-treatment after using the lubricating liquid, it is possible to miniaturize the production apparatus and the production line and to significantly reduce the cost. However, water and an aqueous lubricating liquid have the problem that lubricity is inferior compared with hydrocarbon type lubricating oil.

On the other hand, in the manufacture of fins for heat exchangers, etc. in recent years, in order to improve lubricity, lubrication of a lubricating film made mainly of ethylene glycol or the like on the surface of an aluminum plate having a thickness of about 0.1 mm as a fin processing material. A coated aluminum plate is used. In the case where such a lubricating film aluminum plate is used, the preliminary forming, burring, ironing, and reflaring processes other than piercing (punching) during the press working process are not particularly troubled by lubrication with water or an aqueous lubricant. The results are obtained from preliminary experiments conducted before the present invention.

However, in the process of piercing, even if a lubricating film part aluminum plate is used, the aluminum part exposed in the front end surface and a metal mold | die contact directly. For this reason, the heat which generate | occur | produces by friction etc. during the process repeats is a cause, and the metal mold | die and female mold | die stick together, and the problem that a metal mold | die breaks arises (refer FIG. 13).

In addition, since the lubricating film of the lubricating film part aluminum plate is manufactured as a water-soluble substance, such as ethylene glycol, when used in large quantities with respect to the board | substrate which processes water or an aqueous lubricating liquid containing a lot of water, a lubricating film will wash away and it will lubricate. It was also found in the preliminary experiments by the present inventors that this deterioration and subsequent influence on the subsequent steps were performed. Therefore, when piercing, it was thought that it was effective to supply locally to the place which needs a lubricating liquid.

As a technique for locally supplying a lubricating liquid, Patent Document 1 discloses a mold apparatus capable of locally applying press working oil to a tip end portion of a punch used in an ironing process and a portion where a press working of a material is performed. have. In addition, Patent Document 2 discloses a pierce punch capable of locally applying lubricating oil to the outer periphery of the distal end of a pierce punch in sliding contact with the front end face of the workpiece.

In addition, a pierce punch conventionally used in the field of press working of a heat exchanger fin is used together with a hydrocarbon-based lubricating oil, and, like the extrusion member (knock out) disclosed in Patent Document 1, therein A lubricating oil passage is provided so that the lubricating oil can be locally supplied to the outer circumference of the pierce punch tip. Such a conventional pierce punch is shown in FIG. 12 together with the burring punch which becomes a female mold.

As can be seen from FIG. 12, the pierce punch 101 is provided with a lubricating oil passage 133 that penetrates in the axial direction from the base 117 to the tip of the pierce punch 101. The radial lubricating oil injection hole 135 opening in the outer circumferential surface 113 of 101 does not interfere with the inner surface of the receiving hole 128 of the burring punch 102 at the bottom of the base 117 and does not reach the fitting. Not installed).

With this configuration, lubricant oil is locally supplied to the tip portion of the pierce punch 101 and the outer circumferential surface 113. In addition, the burring punch 102 has a conventional shape having a storage hole 128 to be fitted with the pierce punch 101.

However, in the mold provided with such a conventional lubricating oil passage and injection hole, it cannot be practically tolerated when used with water or an aqueous lubricating liquid. When the piercing of the lubricating film part aluminum plate is performed while lubricating with an aqueous lubricating liquid using this conventional mold, the tip ends of the pierce punch 101 and the burring punch 102 are pressed together due to lack of lubrication (poor). This is because 102 is broken.

In fact, the piercing of the lubricating film portion aluminum plate was carried out at a speed of 200 to 210 shots per minute using such a conventional mold, and the mold was broken at about 92,000 shots. The SEM photograph which shows this broken conventional mold state is shown in FIG. Referring to Fig. 13A, the pierce punch 101 and the burring punch 102 are burned and pressed to break the burring punch 102 at its distal end portion, and the fragment is fixed to the outer circumferential surface of the pierce punch. Although FIG. 13 (b) is an enlarged photograph of the part enclosed by the square of FIG. 13 (a), it turns out that the peripheral edge part of the tip of the piercing punch 101 is considerably roughened by friction etc. Can be.

Therefore, an object of the present invention is to provide a press working die and a press working method which are practically endurable by suppressing the burning of the die by friction even when water or an aqueous lubricating liquid is used.

In order to achieve the above object, in the mold for press working according to the present invention, the water-collecting polymerized portion outer peripheral surface or the polymer-molded portion of the metal mold is overlapped when the metal mold and the female mold are fitted to each other to cut the material. At least one of the main components is formed on the inner circumferential surface in which all or part of the lubricating liquid storage portion in which the lubricating liquid is temporarily stored is formed.

By setting it as such a structure, a lubricating liquid can be stored at least temporarily in the lubricating liquid storage part provided in the outer peripheral surface of a collection mold, or the inner peripheral surface of a female mold. When the lubricating liquid is stored in the lubricating liquid reservoir, the stored lubricating liquid is spread widely enough where a lubrication between the collection mold and the female mold or between the collection mold and the metal plate is particularly necessary, thereby reducing the frictional resistance there. Moreover, since all or part of the lubricating liquid storage part is formed in the superposition | polymerization part which overlaps a metal mold | die and a female mold, the polymerization part of both the metal mold | die and the female metal mold | die which generate | occur | produce friction heat can be lubricated and cooled efficiently.

Moreover, in this invention, the recessed part is provided in at least one part of the outer peripheral surface of a metal mold | die, or the inner peripheral surface of a female mold | die as a lubricating liquid storage part.

With this configuration, the area of the portion in which the collection mold and the female mold slides is reduced, so that the frictional area of the mold can be reduced and generation of frictional heat can be suppressed. In particular, when at least a portion of the lubricating liquid reservoir is provided on the outer peripheral surface of the polymerized portion where the female mold is overlapped, the area of the part where the mold and the metal plate (working material) are in sliding contact also becomes small, so that generation of frictional heat can be further suppressed. have. Moreover, when an aqueous lubricating liquid is used as a lubricating liquid, since the specific heat of an aqueous lubricating liquid is large, a metal mold | die can be cooled efficiently.

In addition, the present invention provides, as the lubricating liquid storage portion, a small diameter portion having an outer diameter smaller than the outer diameter at the tip of the water collecting mold on the outer peripheral surface of the water collecting mold polymerization portion, or A large diameter portion having an inner diameter larger than the inner diameter at the edge of the open end of the female mold is formed on the inner circumferential surface of the female mold portion.

With such a configuration, the small diameter portion or the large diameter portion can be formed by cutting or the like at the time of manufacturing the mold, and the lubricating liquid reservoir portion having high lubricity and cooling effect can be formed in the mold by easy processing.

In addition, the present invention is provided with a lubricating liquid passage for supplying a lubricating liquid to a lubricating liquid reservoir in a water collecting mold or a female mold.

With this configuration, the lubricating liquid flows through the lubricating liquid passage so that the lubricating liquid can be supplied to the lubricating liquid reservoir reliably and efficiently. If the lubricating liquid passage is installed from the base of the collection mold to the inside of the collection mold, and installed so as to communicate with the lubricating liquid reservoir formed on the outer peripheral surface of the collection mold, the lubricating liquid flows through the interior of the collection mold to the lubricating liquid storage portion. Since the lubricating liquid can be supplied more reliably and efficiently, the lubricating liquid can be supplied to the lubricating liquid reservoir on the outer circumferential surface of the polymerized portion.

Moreover, this invention is an axial passage which penetrated along the axial direction from the base of a collection die, and the branch passage which communicates with this axial passage and extends in the direction containing a radial component of a collection die. The collision wall which changes the direction which a lubricating liquid flows to the direction containing a radial component from the axial direction of a metal mold | die is provided in the part which an axial passage and a branch passage intersect.

With this configuration, the lubricating liquid flowing in the axial passage hits the collision wall and flows in the branch passage. Therefore, the lubricating liquid can be supplied to the lubricating liquid reservoir on the outer circumferential surface of the mold-type polymerization portion more reliably and efficiently.

Moreover, this invention implements chamfering in at least one part of the peripheral edge of a lubricating liquid storage part.

With this configuration, the lubricating liquid flows easily from the lubricating liquid reservoir toward the tip or opening of the mold, which is in contact with a metal plate such as aluminum, and has the most load and requires lubrication. Therefore, the lubrication and cooling performance to a metal mold | die can be improved further, and the clamping of a metal mold | die can be suppressed.

In addition, the present invention partially reduces the distance between the lubricating liquid reservoir and the edge of the water collecting die or the opening edge of the female die.

With such a configuration, the lubricating fluid reservoir portion is partially approached to the tip or the open end of the mold, which is the load portion, and the lubricating fluid in the lubricating fluid reservoir portion easily flows to the collection type tip or the female mold opening end at such a portion. . On the other hand, the strength required when cutting and punching a metal plate such as aluminum can be secured at the other end of the collection type tip and the female type opening end. For this reason, it becomes possible to lubricate a collection type | mold tip and a female mold | type opening edge efficiently, maintaining the mold strength required for a process.

As a lubricating liquid supplied to the lubricating liquid reservoir, water-based lubricating liquids in which water or water-soluble lubricants are dissolved in water can be produced in a natural environment, and at the same time reduce costs, process equipment, and processing lines. Can be simplified and downsized.                     

In the press working method according to the present invention, when a through hole is continuously drilled a plurality of times through a thin-walled metal plate by using the above-described press working die, when the collection mold and the female mold are fitted, All or a part is formed on the outer peripheral surface of the overlapping polymerized portion of the overlapping mold or the inner surface of the polymerized portion of the female die and at least temporarily becomes the same state from the state where the mold and the female die are fitted to the lubricant storage portion that stores the lubricant. It is characterized by having the process of supplying a lubricating liquid for the time until it.

In this way, the lubricating liquid can be supplied to the lubricating liquid storage unit every press cycle, and the lubricating liquid is stored at least temporarily for each press cycle in the lubricating liquid storage unit. Thus, when the collection mold and the female mold are fitted together, The efficiency is improved.

EMBODIMENT OF THE INVENTION Below, embodiment of this invention is described, referring drawings. In addition, this invention is not limited by this embodiment.

(First Embodiment)

Fig.1 (a) is a partial enlarged longitudinal cross-sectional view which shows 1st Embodiment which applied the metal mold | die for press work by this invention to the metal mold | die for piercing and burring. In the metal mold | die shown in FIG. 1, the pierce punch 1 is used as the collection mold for piercing which a hole is provided in a metal plate, and the burring punch 2 is used as a female mold. The pierce punch 1 and the burring punch 2 are each made of cemented carbide. The piercing punch 1 constitutes the upper mold 5 together with the burring die button 3 arranged to surround this, and the burring punch 2 together with the stripper plate 4 arranged around the lower die. The metal mold | die 6 is comprised.

The pierce punch 1 and the burring punch 2 are formed by punching holes with respect to the metal plates disposed therebetween by shear forces, and after the drilling, the pierce punch 1 is fitted into the burring punch 2 so as to fit together. It is.

The lubricating liquid storage part 10 is provided in the outer peripheral surface 13 of the pierce punch 1. In this embodiment, as the lubricating liquid storage part 10, the small diameter part which has an outer diameter smaller than the outer diameter in the front-end | tip part 15 of the piercing punch 1 is formed. FIG.1 (b) is the figure which expanded and showed the range of the superposition | polymerization part 13a, 24a which each outer peripheral surface and inner peripheral surface overlap when the piercing punch 1 and the burring punch 2 are fitted, and FIG. As shown in the figure, the lubricating liquid storage part 10 of the pierce punch 1 is provided in the polymerization part outer peripheral surface 13a of the pierce punch 1. In this embodiment, the small diameter part which comprises the lubricating liquid storage part 10 is provided in the position deviated by the predetermined length from the front-end | tip edge 15a of the pierce punch 1. This is to ensure sufficient strength at the tip portion 15 of the pierce punch 1 that is subjected to a relatively large load (load) at the time of piercing.

The pierce punch 1 has a lubricating liquid passage 31 which communicates with the lubricating liquid storage part 10. As shown in the figure, the lubricating liquid passage 31 is provided in the pierced punch hole from the base 17 of the pierce punch, and communicates with the lubricating liquid reservoir 10 formed on the outer peripheral surface 13a of the polymerization portion. The lubricating liquid passage 31 of the present embodiment communicates with the axial passage 33 which is drilled along the axial direction from the base 17 and the axial passage 33, and the radial direction of the pierce punch 1. It is comprised as the branch passage 35 extended in the.

In addition, the lubricating liquid passage 31 is branched from the axial passage 33 to the longitudinal cross-sectional Y-shaped shape, without being limited to such a configuration. It may be formed so that it may be comprised as a branch passage (not shown) extended in the direction containing a radial component so that it may communicate with the lubricating liquid storage part 10. FIG.

In this embodiment, although the lubricating liquid channel | path 31 is provided in the inside of the piercing punch 1 of a collection type | mold, if a lubricating liquid can be supplied to the lubricating liquid storage part 10, a lubricating liquid channel | path will be in either a collection type or a female die. May be provided, or may be provided inside the mold or externally. In the present embodiment, two branch passages 35 are provided in the radial direction, but four or six branch passages 35 are provided if the strength of the tip portion 15 can be sufficiently secured. It can also be installed as appropriate.

As can be seen from FIG. 1 (a), the branch passage 35 of the present embodiment has a portion opened to the small diameter portion forming the lubricating liquid storage portion 10, and the other portion is smaller than the small diameter portion. Opening is performed on the pierce punch outer circumferential surface at a position near the tip edge 15a of the pierce punch 1. Thus, by making the opening part 35a of the branch passage 35 into a part of the lubricating liquid storage part 10, the lubricating liquid storage part 10 becomes a piercing punch 1 in the opening part 35a of the branch passage 35 as a result. The distance from the tip edge 15a of the shape becomes small.

Further, even when the lubricating liquid reservoir 10 is provided in the female mold, the distance between the lubricating liquid reservoir 10 and the open end edge 26a of the female mold can be formed to be small.

The impingement wall 37 is formed at a portion where the axial passage 33 inside the pierce punch 1 and the branch passage 35 intersect (the branch where the branch passage 35 branches from the axial passage 33). ) Is installed. In addition, in this embodiment, although the collision wall 37 is formed by making the axial passage 33 thinner at the front end side of the pierce punch 1 than the intersection with the branch passage 35, the axial passage 33 The collision wall 37 may be formed so that the terminal may terminate in the collision wall 37.

Here, as an reference, an example of one dimension of the pierce punch 1 will be described with reference to FIG. 1C. In this example, the diameter d of the tip of the pierce punch 1 is 4.8 mm, and the length g in the axial direction from the tip edge to the small diameter portion is 2 mm. The small diameter part used as the lubricating liquid storage part 10 is 3.5 mm in length in the axial direction, and is recessed by 0.2 mm from the outer peripheral surface of the polymerization part (shown as f in Fig. 1 (c)), and the diameter (outer diameter) s Is 4.4mm. Therefore, in this case, the volume of the lubricating liquid storage part 10 becomes about 10.11 mm <^3> , and it becomes possible to store the lubricating liquid of the quantity according to this volume in the lubricating liquid storage part 10. FIG. In addition, about the diameter of the axial channel | path 33 in the lubricating liquid channel | path 31, let i = 2mm from the base 17 to the collision wall 37, and the piercing punch 1 of the piercing punch 1 may be carried out. The tip is made e = 1mm. The diameter j of the branch passages 35 is 1.5 mm.

The female burring punch 2 has a storage hole 28 which opens to an inner diameter slightly larger than the outer diameter of the tip portion 15 of the pierce punch 1 and receives the tip portion of the pierce punch 1. The inner circumferential surface 24 of the storage hole 28 overlaps with the outer circumferential surface 13a of the polymerized portion of the pierce punch 1 when the pierce punch 1 and the burring punch 2 are fitted to each other ( Has 24a). Moreover, two steps 44 and 45 are provided in the lower part of the polymerization part inner peripheral surface 24a of the storage hole 28 so that an inner diameter may become large as it goes down, and as a pierce punch 1, The metal piece which comes out when a hole is provided in a metal plate falls easily under the burring punch 2.

Next, the operation | movement of the metal mold | die device for piercing burring shown in FIG. 1 is demonstrated. Here, in this embodiment, the downward direction in FIG. 1 is the insertion direction of the pierce punch 1, and the upper direction is the drawing direction of the pierce punch 1.

After the metal plate, such as a lubricating film part aluminum plate which becomes a material of a heat radiation fin, is mounted on the stripper plate 4, the upper metal mold | die 5 descends. The tip edge 15a of the pierce punch 1 is in contact with the metal plate, and then the metal plate is sandwiched and supported by the die button 3 and the stripper plate 4. The piercing punch 1 is further lowered, and when the tip portion 15 of the pierce punch 1 is to be fitted into the storage hole 28 of the burring punch 2, the metal plate is cut by the shear force, and the hole is drilled. Is formed.

After the hole is formed, the burring punch 2 also rises with the rise of the pierce punch 1. By this rise, the periphery of the hole of the metal plate drilled is pushed up from the bottom to the extrusion part 42 provided in the front-end | tip part 26 of the burring punch 2, and the extrusion part 42 and the die button 3 are carried out. The burring is carried out by the burring accommodating portion 46 of. Thereafter, the upper die 5 is raised, the burring punch 2 is lowered, and the metal plate subjected to the piercing / burring process is separated from the burring punch 2 by the stripper plate 4, so that the piercing / burring process is performed. It ends.

Next, the effect | action of the lubricating liquid storage part 10 at the time of piercing is demonstrated using FIG. 2 and FIG. FIG. 2: shows the state where the piercing punch 1 and the burring punch 2 were fitted in the press working die shown in FIG. 1, and FIG. 3 has shown the state which isolate | separated both. . The lubricating liquid is supplied from the tank (not shown) to the die for press working by pressure supply means such as a gear pump (not shown). The supplied lubricant flows downward from the base 17 of the pierce punch 1 past the axial passage 33, but a part of the branch passage communicates with the lubricant reservoir 10 by the impingement wall 37. The direction is switched to 35. The lubricating liquid is preferably supplied to the lubricating liquid reservoir 10 so as not to include a gas in the lubricating liquid as much as possible. This is because when the lubricating liquid is supplied to the lubricating liquid storage part 10 without containing gas as a liquid, for example, the cooling performance is higher than when the lubricating liquid is supplied in a mist state.

The lubricating liquid supplied to the lubricating liquid storage part 10 flows down the polymerization part outer peripheral surface 13a of the piercing punch 1 downward when lubricating the metal mold | die shown in FIG.

At the time of fitting, the inner peripheral surface 24a of the polymerization section of the burring punch 2 contacts the lubricating liquid stored in the lubricating liquid storage section 10, and the outer peripheral surface of the polymerization section of the pierce punch 1 and the inner peripheral surface of the polymerization section of the burring punch 2 It flows between (24a), and lubricates each superposition | polymerization part of the piercing punch 1 and the burring punch 2, respectively.

In addition, when the lubricating liquid is supplied to the mold at a high pressure in accordance with the timing of drilling, chips generated at the front end of the metal plate are transferred from the pierce punch 1 and the burring punch 2 with the fed lubricating liquid. Will flow. Thereby, a chip | tip adheres to a metal mold | die, it can be prevented from being chewed between the piercing punch 1 of a collection type | mold, and the burring punch 2 of a female type | mold, and causing a press.

As described above, the branch passage 35 of the present embodiment is opened at a position closer to the tip edge 15a of the pierce punch 1 than the small diameter portion forming the lubricating liquid reservoir 10. That is, the lubricating liquid storage part 10 is formed so that the distance from the opening edge 35a of the branch passage 35 to the tip edge 15a of the pierce punch 1 may become small partially. As a result, the lubricating liquid is more likely to flow toward the leading edge 15a than the portion of the lubricating liquid reservoir 10 formed as the small diameter portion in the opening 35a.

As can be seen from FIG. 2, the small diameter portion serving as the lubricating liquid reservoir 10 has an end portion (small diameter upper end portion) farther from the leading edge 15a of the pierce punch 1. It is formed so that it may be located slightly above the tip edge 26a of the burring punch 2 at the time of fitting. The lubricating liquid flowing out of the branch passage 35 not only flows from the lubricating liquid reservoir 10 toward the tip edge 15a of the pierce punch 1, but also the inner circumferential surface of the polymerization portion of the lubricating liquid reservoir 10 and the burring punch 2. It passes between 24a and flows also out of the burring punch 2 from the front end edge (upper edge) 26a of the burring punch 2. As a result, the tip of the burring punch is lubricated and cooled together with the inner and outer surfaces. In this case, when a water or an aqueous lubricating liquid containing a large amount of water is used as the lubricating liquid, the specific heat of the lubricating liquid is larger than that of the oil-based lubricating liquid, so that a higher cooling effect can be obtained.

Moreover, it is preferable that the upper end part of the small diameter part used as the lubricating liquid storage part 10 exists in the position which does not contact with the metal plate of a process object. This is because contact with the metal plate may cause unnecessary and harmful metal powder.

As can be seen from FIG. 2, the tip portion 15 of the pierce punch 1 is in sliding contact with the inner circumferential surface 24a of the polymerization portion of the burring punch 2, but the portion of the lubricating liquid storage portion 10 is the outer circumferential surface. Since it is recessed with respect to, it does not contact with the inner peripheral surface 24a of the polymerization part. That is, the friction area between the metal mold | die and the female metal mold | die reduces, and the excess friction can be reduced. For this reason, the generation of frictional heat is also suppressed.

When 100,000 piercings were carried out at a speed of 200 to 210 shots (stroke) per minute using the press working die and the water-based lubricating liquid according to the first embodiment, the fatal breakage of the mold was not recognized. A slight wear was recognized at the tip of the mold and the female mold. The wear of this mold was inferior to that in the case of using hydrocarbon press oil. The SEM photograph which photographed the state of the mold after 100,000 shots is shown to FIG. 4 (a) and FIG. 4 (b). 4 (a) and 4 (b) correspond to Figs. 13 (a) and 13 (b), respectively. Compared with the same SEM photograph of the conventional mold of FIG. 13, it is understood that the lubricity is greatly improved.

In addition, the supply of the lubricating liquid from the tank to the press die may be always performed or may be performed intermittently. When the lubricant is intermittently supplied, the supply of the lubricant can be controlled in accordance with the movement of the rotary shaft of the press by the use of a rotary cam and an encoder. For example, when the top dead center of an upper mold is 0 degree | times, a lubricating liquid turns into a metal mold | die at the rotation position from 170 degree | times to 185 degree | times including lower dead center (180 degree | times). Can be controlled to be supplied to the lubricating liquid reservoir.

(2nd Embodiment)

Next, embodiment of this invention different from embodiment mentioned above is described with reference to FIG. Fig. 5 is a partially enlarged longitudinal sectional view showing a second embodiment in which the die for press working according to the present invention is applied to a die device for piercing and burring.

This press working die differs from the die for press working according to the first embodiment only in that the lubricating liquid reservoir is formed not on the outer peripheral surface of the polymerized portion of the pierce punch but on the inner peripheral surface of the polymerized portion of the burring punch. Therefore, about the element common in FIG. 1 and FIG. 5, the same referential mark is attached | subjected and those detailed description is abbreviate | omitted.

5, the lubricating liquid storage part 10 is formed in the inner peripheral surface 24 of the burring punch 2. As shown in FIG. The lubricating liquid storage part 10 is formed by providing the large diameter part which has an internal diameter larger than the internal diameter in the front edge 26a of the burring punch 2 in the polymerization part inner peripheral surface 24a of the burring punch 2. .

On the other hand, the pierce punch 1 shown in FIG. 5 has the same outer diameter as the outer diameter in the tip edge 15a from the lower edge of the base 17 to the tip edge 15a of the pierce punch 1. Inside the pierce punch 1, a lubricating liquid passage 31 composed of an axial passage 33 and a branch passage 35 is formed. At the portion where the axial passage 33 and the branch passage 35 intersect, a collision wall 37 for changing the flow of a part of the lubricating liquid in the radial direction is provided.

The lubricating liquid passes through the axial passage 33 in the pierce punch 1, impinges on the collision wall 37, and flows out of the opening 35a of the pierce punch outer peripheral surface 13 of the branch passage 35. Therefore, when the pierce punch 1 and the burring punch 2 are fitted, the lubricating liquid flowing from the branch passage 35 is supplied to the lubricating liquid storage part 10 of the burring punch 2 and temporarily stored. In this case, if the surface of the lubricating liquid storage part 10 is made into rough surface processing than the other surface part in the burring punch 2, the lubricating liquid will be retained more by the surface tension of the lubricating liquid. In addition, when the pierce punch 1 enters and receives the storage hole 28 of the burring punch 2, the lubricating liquid flowing out of the opening 35a causes the polymerization portion outer peripheral surface 13a and the burring punch 2 of the pierce punch 1 to pierce. Lubricate the inner circumferential surface 24a of the polymerization portion. In this way, also in the press die in 2nd Embodiment, the part which requires lubrication of a metal mold | die and a to-be-processed material can fully be lubricated.

In addition, although the polymerization part inner peripheral surface 24a of the burring punch 2 is in sliding contact with the polymerization part outer peripheral surface 13a of the pierce punch 1, since the lubricating liquid storage part 10 is formed by the large diameter part, As can be seen from FIG. 5, the piercing punch 1 does not come into contact with the outer peripheral surface 13a of the polymerized portion. Thereby, the area of the friction part of a metal mold | die becomes small and excess friction can be suppressed.

(Third Embodiment)

Next, 3rd Embodiment of this invention is described with reference to FIG. Fig. 6 is a partially enlarged cross-sectional view of the vicinity of the distal end portion of a pierce punch in which the lower edge of the small diameter portion forming the lubricating liquid reservoir is chamfered in the die for press working as in the first embodiment of the present invention. In this pierce punch, only the point where the lower edge of the small diameter part which forms the lubricating liquid storage part 10 is chamfered differs from 1st Embodiment mentioned above. Therefore, the same reference numerals are attached to the elements common to FIGS. 1 and 6, and the detailed description thereof is omitted.

Referring to FIG. 6, a chamfer 51 having an arc shape in cross section is provided at the lower edge of the small diameter portion constituting the lubricating liquid storage portion 10 of the pierce punch 1. As a result, the lubricating liquid supplied through the lubricating liquid passage 31 to the lubricating liquid reservoir 10 easily flows downward by the chamfer 51, so that the tip 15 is easily lubricated. By providing the chamfered portion 51, the contact portion with the inner circumferential surface of the burring punch also becomes smaller, and when the piercing punch 1 is pulled out from the burring punch 2, it is possible to prevent the piercing punch 1 from being caught. have.

In addition, in 3rd Embodiment, although the cross section was formed in circular arc shape, you may make it a taper shape. In addition, the chamfer 51 may be provided not only at the lower edge of the lubricating liquid reservoir but also at the entire portion of the peripheral edge, or may be provided only at a part of the peripheral edge of the lubricating liquid reservoir.

(Fourth Embodiment)

Next, the example which made the lubricating liquid storage part provided in the piercing punch of a water collection type into various shapes is shown in FIG. The lubricating liquid storage part provided in the metal mold | die can be formed in any one form, such as a taper part, a recessed part, a step | step, a groove | channel, etc. provided in at least one part of the outer peripheral surface of the polymerized part of a metal mold | die, or a combination thereof. By doing so, a taper portion, a recess, a step and a groove provided on the outer peripheral surface of the polymerized portion of the water collecting mold, or a combination thereof are formed in accordance with the degree of lubrication required for the mold, the strength of the mold, or the design of the press apparatus as the shape of the lubricating liquid reservoir. Any shape can be selected. In addition, such a taper part, a recessed part, a step | step, a groove | channel, etc. may be provided in one part of the outer peripheral surface of the water-containing polymerization part, and may be provided so that the whole outer peripheral surface of the polymerization part may be included.

FIG. 7A shows an example in which the lubricating liquid storage portion 10 is provided using the tip portion 15 of the pierce punch 1 as a tapered portion. FIG. 7B shows an example in which a plurality of elliptic recesses are provided on the outer circumferential surface of the pierce punch 1 to form a lubricating liquid storage part 10. Moreover, the opening part of a branch passage can also be used as the recessed part which comprises the lubricating liquid storage part 10. FIG. FIG.7 (c) shows the example which provided the lubricating liquid storage part 10 by providing a step in the piercing punch 1 at the part which provided the predetermined distance from the tip edge 15a. FIG. 7 (d) shows an example in which the lubricating liquid reservoir 10 is formed in the pierce punch 1 by a plurality of horizontal grooves or spiral grooves provided in a direction parallel to the tip edge thereof. FIG. 7E shows an example in which the lubricating liquid reservoir 10 is formed by providing the pierce punch 1 with a plurality of longitudinal grooves extending upward in the axial direction from a portion at a predetermined distance from the tip. Indicates. In this example, the lubricating liquid can be supplied to the upper portion of the longitudinal groove, and the lubricating liquid can be supplied to the lower portion of the vertical groove from the upper portion using the vertical groove. In addition, although the example in which the lubricating liquid storage part 10 which has various shapes is formed in the piercing punch 1 which is a collection type | mold is shown in FIG. 7, these various shapes of lubricating liquid storage part are provided in the inner peripheral surface of the female mold | type polymerization part. It may be.

In addition, although the lubricating liquid passage 31 is not described in the pierce punch 1 in FIG. 7, similarly to the previous embodiment, the lubricating liquid passage can be provided in the pierce punch 1 or the burring punch 2.

If the lubricating liquid storage part 10 can be formed in various shapes in this way, the shape of the lubricating liquid storage part suitable for a collection mold or a female mold can be selected according to the degree of lubrication required for a press working die, the strength of a mold, or the design of a press apparatus. have.

(5th Embodiment)

8, 9, and 10 show an example of a die for press working in which a lubricating liquid passage for supplying a lubricating liquid is formed in various forms.

Referring to FIG. 8, a lubricating liquid passage 62 is provided inside the stripper plate 4 that serves as an injection path capable of injecting lubricating liquid toward the lubricating liquid reservoir 10 of the pierce punch 1. The lubricating liquid passage 62 extends obliquely downward to the base of the stripper plate 4 from an upper side of the surface 64 facing the burring punch 2 of the stripper plate 4.

In the press working die shown in FIG. 8, the lubricating liquid injected from the lubricating liquid passage 62 at an appropriate timing lubricates the tip portion 15 of the pierce punch 1 and is temporarily stored in the lubricating liquid storage portion 10. Lubricant necessary for press working is sufficiently secured.

9 shows an example of a press working die in which a lubricating liquid passage 61 is provided in a die button 3. According to FIG. 9, the lubricating liquid passage 61 extends obliquely from the base of the die button 3 to the burring accommodating portion 46, and opens in the burring accommodating portion 46. The lubricating liquid injected from the lubricating liquid passage 61 is scattered to the distal end portion 15 of the lubricating liquid storage portion 10, the pierce punch 1, or the distal end portion 26 of the burring punch 2, and these. Lubricate. In addition, since the lubricating liquid is stored in the lubricating liquid storage part 10, the lubricating liquid required for press working is ensured.

FIG. 10 shows an example of a die for press working in which a lubricating liquid passage 72 is provided inside the female burring punch 2. In FIG. 10, the lubricating liquid storage part 10 is provided in the female die, and the lubricating liquid path 72 is extended so that it may communicate with the lubricating liquid storage part 10 from the base of the burring punch 2. Thereby, the lubricating liquid can be supplied directly to the lubricating liquid storage part 10.

In addition, in the case where the lubricating liquid passage 72 is provided in the female die-type burring punch 2, and the lubricating liquid reservoir 10 is provided in the collection type piercing punch 1, the lubricating liquid passage 72 is polymerized. It extends toward the secondary inner circumferential surface 24a and is formed to open at the polymerization portion inner circumferential surface 24a.

In this way, the inner circumferential surface of the burring punch is sufficiently lubricated, and the lubricating liquid is supplied to the lubricating liquid reservoir 10 of the pierce punch 1 at the time of fitting the pierce punch 1 and the burring punch 2. In addition, the lubricating liquid may be injected from the lubricating liquid passage 72 to be supplied to the lubricating liquid reservoir 10 of the pierce punch 1. By spraying the lubricating liquid, the lubricating liquid can be supplied to and stored in the lubricating liquid reservoir 10, and the lubricating liquid can also be supplied to the distal end of the pierce punch 1.

In the example of FIG. 8 and FIG. 9, although the lubricating liquid storage part 10 was formed in the piercing punch 1 of a collection type | mold, a lubricating liquid storage part was formed in a female mold, and the lubricating liquid channel | path shown in FIG. 8 and FIG. 9 is shown. You may install it. In addition, although the lubricating liquid passage is not provided in the water piercing punch 1 of the collection type | mold in the example of FIG. 8, FIG. 9, and FIG. 10, the lubricating liquid channel | path shown in FIG. 8, FIG. 9, and FIG. The lubricating liquid passage provided in the punch 1 can also be used together. Moreover, the structure which makes the various pierce punches 1 shown in FIG. 7 the pierce punch 1 of FIG. 8, FIG. 9, and FIG. 10 is also possible.

In addition, although not shown in said 1st-5th embodiment, the lubricating liquid supply means for supplying a lubricating liquid to a lubricating liquid storage part through a lubricating liquid channel | path is a pressure feeding means, such as a gear pump, for example. Such a lubricating liquid supply means can be suitably installed in the inside of a press or the element around it.

In addition, in description of each said embodiment, although metal mold | die, such as a piercing punch, was demonstrated only by the cemented carbide alloy, as such a cemented carbide, hard carbide particles, such as tungsten carbide (WC) and titanium carbide (TiC), are mentioned. It is possible to use an iron-based metal such as cobalt (Co) or nickel (Ni) as the bonding phase metal, including the above.

As the water-soluble lubricant described in the above description, an organic phosphorus compound or an organic metal carboxylate can be used.

In addition, it is preferable that the water-based lubricating liquid contains a metal deactivator for inhibiting the elution of the bonded phase metal of the cemented carbide used in the mold into the lubricating liquid. This is because corrosion by elution of the bonded phase of the cemented carbide can be suppressed.

In the die for press working according to the present invention, by forming a lubricating liquid reservoir in a metal mold or a female mold, it is possible to supply a lubricating liquid to a distal end of a mold that requires sufficient lubrication to improve the lubricating effect. Moreover, the area of the friction part of a metal mold | die was made small by providing a lubricating liquid storage part. As a result, even if water or an aqueous lubricating liquid is used for press working, the seizure due to friction of the mold can be suppressed, and even in the case of using water or an aqueous lubricating liquid in place of the press working oil, it can be practically endured. Can provide mold

In addition, in the press working method according to the present invention, since the collection mold and the female mold are fitted in the state where the lubricating liquid is stored in the lubricating liquid storage part by using the mold, lubrication of the polymerization portion where the collection mold and the female mold overlap each other and The efficiency of cooling is improved. As a result, even when an aqueous lubricant with low lubricity is used, it is possible to provide a press working method which can practically endure the problems such as sticking of the mold due to friction.

In addition, in the mold for press working according to the present invention, even when using an aqueous lubricating liquid having a lower lubrication performance than a hydrocarbon-based lubricating liquid, the mold life can be extended even when a conventional hydrocarbon-based lubricant is used. You can expect the effect.

The metal mold | die for press working and the press working method by this invention are useful when a through hole and cutting out are provided in a process target material by the shearing force of a metal mold | die and a female mold.

Claims (11)

As a mold for press working which has a male mold and a female mold fitted to each other, and performs cutting of a material by the said mold and the female mold, A recess is formed in at least a part of the outer peripheral surface of the polymerization portion of the water mold, or at least a portion of the inner peripheral surface of the polymerization portion of the female mold, which overlaps when the water mold and the female mold are fitted; At least temporarily provide a lubricating liquid reservoir in which lubricating liquid is stored, The lubricating fluid storage part is formed such that the distance between the lubricating fluid storage part and the front end of the mold or the opening edge of the female mold is partially reduced, and the surface of the lubricant storage part is A die for press working which has a surface roughness that is rougher than that of the die or other female dies. delete delete The press working die according to claim 1, wherein a lubricating liquid passage for supplying a lubricating liquid to said lubricating liquid storage portion is provided in said collection mold or said female mold. The said lubricating liquid channel | path is provided in the inside of the said metal mold | die from the base of the said metal mold | die, and it communicates with the said lubricating liquid storage part formed in the outer peripheral surface of the polymerized part of the said metal mold | type. Mold for press processing. The lubricating liquid passage according to claim 4 or 5, wherein the lubricating liquid passage communicates with the axial passage provided in the axial passage formed through the axial direction from the base of the water collecting die, and includes the radial component of the water collecting die. A collision which consists of a branch passage extending in the direction and which changes the direction in which the lubricating fluid flows from the axial passage to the branch including the radial component from the axial direction of the water collecting die. Press forming die, characterized in that the wall is provided. delete The press working die according to any one of claims 1, 4 and 5, wherein at least a part of a peripheral edge of the lubricating liquid reservoir is chamfered. delete The press working according to any one of claims 1, 4 and 5, wherein the lubricating liquid reservoir is supplied with an aqueous lubricating liquid in which water or a water-soluble lubricant is dissolved in water as the lubricating liquid. mold. delete

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