WO2007013675A1 - Moule pour forgeage, procédé de production de produit moulé pour le forgeage, et son produit forgé - Google Patents

Moule pour forgeage, procédé de production de produit moulé pour le forgeage, et son produit forgé Download PDF

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Publication number
WO2007013675A1
WO2007013675A1 PCT/JP2006/315349 JP2006315349W WO2007013675A1 WO 2007013675 A1 WO2007013675 A1 WO 2007013675A1 JP 2006315349 W JP2006315349 W JP 2006315349W WO 2007013675 A1 WO2007013675 A1 WO 2007013675A1
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WIPO (PCT)
Prior art keywords
forging
mold
gas
opening
hole
Prior art date
Application number
PCT/JP2006/315349
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English (en)
Japanese (ja)
Inventor
Koji Watanabe
Original Assignee
Showa Denko K.K.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Showa Denko K.K. filed Critical Showa Denko K.K.
Priority to JP2007526945A priority Critical patent/JPWO2007013675A1/ja
Publication of WO2007013675A1 publication Critical patent/WO2007013675A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00—Details of machines for forging, pressing, or hammering
    • B21J13/02—Dies or mountings therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00—Details of machines for forging, pressing, or hammering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/18—Making machine elements pistons or plungers

Definitions

  • the present invention relates to a forging die, a forging molded product manufacturing method, a forging device, and a forged molded product for manufacturing a forged molded product having a complicated shape without lack of thickness.
  • Japanese Laid-Open Patent Publication No. 10-1 1 8 7 3 4 discloses a forged product that prevents the forging material from being blocked by air trapped in the cavity and has good dimensional accuracy.
  • a method of providing an air vent in a mold for the purpose of obtaining the above is disclosed.
  • the diameter of the hole is preferably 1 mm or more, and the maximum thickness can be taken at that position. If the hole diameter of the air vent does not reach 1 mm, the forging material force pushed into the hole during forging may break when the forged product is taken out from the mold and remain in ⁇ L. As a result, the air vent that releases the air in the cavity at the next forging can no longer be expected. However, if the hole has a diameter larger than the wall thickness, the volume of the forging material flowing into the hole becomes too large, and it is easy for a hole to be formed near the hole.
  • the position at which the air vent is opened is determined according to the product shape. However, as long as air is likely to accumulate, the corners of the product, dead ends, thick parts, thick parts with large thickness changes, etc. It may be possible.
  • the hole of the air vent can be used as a forging material reservoir so that the plastic flow of the forging material in each part is constant.
  • the air vent depends on the punch speed (forging speed), the air vent in the cavity needs to be large enough to escape to the outside without being compressed. Since the forging is performed using a die provided with an air vent, the forging material protrudes like a wart in the resulting forged product corresponding to the opening position of the air vent. This protrusion is removed from the forged product by belt sanding, machining, or the like.
  • Japanese Patent Application Laid-Open No. 10-2 7 2 5 3 2 discloses that a fitting portion of a mold dividing portion (which is fixed by a shaft and does not slide again), The clearance at the contact portion may be used as a gas vent passage.
  • Japanese Patent Application Laid-Open No. Sho 61-1515 727 also discloses a method in which a mold sliding portion composed of a die and a knockout pin is used as a gas vent hole.
  • the mold dividing part indicates a boundary part of the divided body when the mold is divided into a plurality of divided bodies.
  • the mold sliding portion indicates a boundary portion of the mold in which at least one of the divided bodies slides.
  • an air vent hole such as a conventional forging die
  • the hole diameter is simply ⁇ 1 mm or more, and as a result, the amount of forging material pushed into the air vent hole becomes large.
  • an air pin a pin-like shape
  • This is particularly likely to occur when forging a product that requires a high forging load, or when it is installed at a location close to the mold dividing position.
  • the clearance with the knockout pin which is the die sliding portion, is used as a gas vent passage, the forging material easily enters the clearance portion.
  • the gas includes a gas in the atmosphere of the forging process, for example, air, an inert gas, or a vaporized lubricant, for example, water vapor, vaporized oil, or the like.
  • the present invention has been completed in view of such a situation, and even if it has a complicated shape, it suppresses the occurrence of thinning due to air confined in the molding hole of the mold, and is sufficiently forged in the molding hole.
  • the purpose is to obtain a forged product with good dimensional accuracy by flowing the material. Disclosure of the invention
  • the present invention relates to (1) a forging die having a gas vent passage for discharging gas trapped in a molding hole of a forging die at the time of molding, wherein the gas vent passage is perpendicular to the gas flow direction.
  • the opening area of the first step portion facing the molding hole wall surface is smaller than the opening area of the second step portion connected to the step portion, and the opening
  • the forging die is characterized in that the portion is provided on a wall surface formed of a mold dividing portion or a wall surface formed of an integral mold portion.
  • the above-mentioned mold dividing part is a part of the boundary part of the divided body when the mold is divided into a plurality of divided bodies, and is a part fixed so that the divided body does not slide due to a flail or the like. That is.
  • the above-mentioned integral part is a part constituted by mold components that are not divided. This includes the case where the entire mold is manufactured as a single unit.
  • a forging die according to the cross-sectional area of the opening formed in the molded hole wall is 0. 0 1 ⁇ 1 mm 2 ( 1).
  • the length of the shape part on the opening side formed in the wall surface of the molding hole is 1 to 15 times the area value on the opening side, The above (1) to (4) This is a forging die.
  • the opening is provided at a position where a gas reservoir recovery confined in a recess and / or a groove formed in the mold wall of the forming hole and the forging material becomes a closed space.
  • the present invention uses the forging die according to any one of the above (1) to (6), throws the forging material into the forming hole, and forms the concave portion and groove or groove portion of the forming element L.
  • This is a manufacturing method of a molded product that forges while allowing the gas confined in the gas to escape through the gas vent passage.
  • the above forging material is any one kind of metal selected from aluminum, iron, magnesium, and titanium, or an alloy containing these as a main component. This is a method for producing a forged product.
  • the present invention includes a forged product manufactured by the method described in (7).
  • the present invention includes a forging device having the forging die described in any one of (1) to (6).
  • the gas vent passage is perpendicular to the gas flow direction. It has a plurality of stepped portions having different cross-sectional areas, and the opening area of the first stepped portion facing the molding hole wall surface is smaller than the opening area of the second stepped portion connected thereto. Since it is provided on the wall consisting of the mold part or the wall consisting of the integral part, even if a part of the forging material that has entered the gas vent passage breaks in the gas vent passage when the product is discharged, The pressure is pushed to the next stage, clogging is eliminated, and the gas vent passage is not blocked.
  • the shape of the air pin is narrowed and shortened, so that the removal work from the product can be reduced.
  • the cross-sectional area of the opening formed in the wall surface of the molding hole is 0.01 to 1 mm 2 , the shape of the air pin is thin and short, so the removal work from the product can be reduced.
  • the diameter of the inscribed circle in the cross-sectional shape of the opening formed in the wall surface of the molding hole is 0.1 "to 1 mm, the air pin shape is thin and short, and the removal work from the product can be reduced.
  • the wall surface of the passage should be in contact with the air pin. It is possible to reduce the resistance when clogging is eliminated.
  • FIG. 1 is a perspective view showing an example of a forged product suitable for manufacturing with the forging die of the present invention.
  • FIG. 2 is a perspective view showing another example of a forged product suitable for manufacturing with the forging die of the present invention.
  • FIG. 3 is a perspective view showing another example of a forged product suitable for manufacturing with the forging die of the present invention.
  • FIG. 4 is a longitudinal sectional view showing an example of a forging die according to the present invention.
  • FIGS. 5 (A) to (E) are enlarged longitudinal sectional views showing an example of a gas vent passage used in the forging die.
  • FIGS. 6 (A) to (D) are a plan view and a cross-sectional view of an essential part of a gas vent passage used for the forging die.
  • FIG. 7 is an enlarged cross-sectional view of the gas reservoir portion of the forging die shown in FIG.
  • FIGS. 8 (A) to (C) are explanatory views showing respective forming steps of the forging material using the forging die of the present invention.
  • Fig. 9 (A) to (F) show each molding of the forging material using the forging die of the present invention. It is explanatory drawing which shows a process.
  • FIGS. 10 (A) to (E) are explanatory views showing respective forming steps of a forging material using the forging die of the present invention.
  • FIG. 11 is an explanatory view showing an embodiment of a forging device used in the present invention.
  • FIG. 12 is an enlarged longitudinal sectional view showing an example of a gas vent passage provided with a control pin.
  • FIG. 13 is a longitudinal sectional view showing an example of a mold for forging the forged product of FIG.
  • FIG. 14 is a longitudinal sectional view showing an example of a mold for forging the forged product of FIG.
  • FIG. 15 is an enlarged sectional view of the mold shown in FIG. Best Mode for Carrying Out the Invention ''
  • the forging die of the present invention has a plurality of step portions having different cross-sectional areas, and the opening area of the first step portion facing the forming hole wall surface is smaller than the opening area of the second step portion connected thereto.
  • a gas vent passage whose opening is provided on the wall surface made of the mold dividing portion or the wall surface made of the integral mold portion, clogging of the gas vent passage is prevented and the occurrence of thinning is prevented. It is possible to produce a forged molded article having a reduced dimensional accuracy.
  • the complicated shape of the molded product that is the subject of the present invention is the shape in which the rib 11 is raised as shown in FIG. 1, and the periphery is a recess as shown in FIG. 3 has a shape in which the convexity 12 is substantially increased, or a shape like a piston of an internal combustion engine as shown in FIG.
  • the part of the mold corresponding to such a shape becomes a concave part and Z or groove part that becomes a closed space on the mold wall surface and the forging material, and gas is confined there, and it is easy for gas accumulation to occur. It is.
  • products having such a shape include a double-headed piston for a swash plate compressor, a vortex housing for a scroll compressor, and an internal combustion engine piston.
  • the present invention directly molds products having these shapes. In this case, it is also intended to form primary processed molded products having these shapes.
  • Fig. 1 3 shows a second embodiment of a forging die for forging a forged product from a metal material. Like the die in Fig.
  • the die 30 is a lower die 3 1 and The upper mold 3 2 and the knockout pin 3 3 for taking out the formed product from the lower mold 3 1 or the gas vent path 3 4 are configured.
  • the lower die 3 1 and the upper die 3 2 are each provided with a forging hole 35 at the center.
  • This forging die is preferably used for forming a scroll compressor spiral body composed of a base plate surface 13 and blades 14 as shown in FIG.
  • FIG. 14 shows a third embodiment of the forging die according to the present invention. Like the die shown in FIG. 13, the die 30 of this embodiment is vented to the lower die 31. Passage 3 4 is provided.
  • This forging die 30 is preferably used for molding a piston of an internal combustion engine having a head surface 15, a skirt portion 16, a rib portion 17 and a pin boss portion 18 as shown in FIG. I can.
  • the forging die 30 of the present invention includes a lower die 3 1 and an upper die 3 2 for forging a forged molded product from a metal material, and a knockout pin for taking out the molded product from the lower die 3 1. 3 3 and a gas vent passage 34.
  • the molds 3 1 and 3 2 are provided with forging holes 35 at the center.
  • This forging die is used, for example, for forging a double-headed piston as a forging product having ribs 11 parallel to the operation direction axis of the upper die as shown in FIG. It is a mold.
  • description will be made based on the forging of this double-headed piston.
  • the material of the forging die 30 for example, die steel can be used.
  • the gas vent passage 34 of the present invention has, for example, at least a two-part configuration of a first stage part X and a second stage part Y in the gas flow direction as shown in FIG. 5 (A). It is also possible to use a multi-stage configuration.
  • the first step XI is a part provided on the molding hole 35 side.
  • the connecting portion Z1 between the first step portion XI and the second step portion Y1 only needs to be connected such that the cross-sectional area of the second step portion Y1 is larger than the cross-sectional area of the first step portion XI. . Further, it may partially have a cross-sectional area larger than the second step portion Y1.
  • the cross-sectional area of the opening 36 formed in the wall surface of the forming hole of the forging die 30 is, for example, 0.1 to 1 mm 2 . Further, the diameter of the opening 36 may be 0.1 to 1 mm.
  • the gas vent passage 34 may be formed at any time before or after the split molds are combined. However, in consideration of the accuracy of the gas vent passage, it is preferably formed after the merge. Further, even in the integrated type, the gas vent passage 3 4 may be created before or after the forging hole 3 5 is created. However, in consideration of the accuracy of the gas vent passage, the forging hole is formed. It is preferable to form it after producing 35.
  • the shape of the second step portion Y 1 is not particularly limited.
  • the forging die 30 can be formed in a shape having an opening on the outer surface.
  • the cross-sectional area of the first step portion X 1 is preferably 0.1 to 1 mm 2 (more preferably 0.0 3 to 0.2 mm 2 ).
  • the cross-sectional area of the second step portion Y 1 is preferably 1.04 times or more (more preferably 1.3 to 3 times) the cross-sectional area of the first step portion.
  • the air pin breaks in the gas vent passage because it does not contact the intruding forging material. After forging, it does not become (friction) resistance when the air pin is pushed and moved by the gas pressure.
  • the diameter of the circumscribed circle of the cross section of the opening 36 is 1 mm or less, preferably 0.1 to 1 mm, more preferably 0.2 mm to 0.5 mm. Below that, drilling is difficult. If it exceeds that, the inflow of the forging material will increase, and the air pin after forging may be too long.
  • the length of the first step portion XI is preferably 1 to 15 times (more preferably 5 to 10 times) the area value of the first step portion X1.
  • the length of the first step portion X1 is preferably 1 to 10 mm.
  • the length of the second step portion Y 1 is preferably a length penetrating to the lower side of the lower mold 31 or the upper mold 32.
  • the length of the first step X 1 By making the length of the first step X 1 in this way, it is possible to control the (friction) resistance when the air pin is pushed and moved by the gas pressure during forging after the air pin is broken. preferable. Further, if the length of the first step portion XI is made less than 1 times the area value of the first step portion XI, the forging die may be short due to its short length. Furthermore, if the area value of the first stage X1 is 15 times or more, the (friction) resistance is large and the air pin may not be pulled out.
  • the length of the second step Y 1 is set in this way. If the effective length is determined, the clogged air pins may accumulate up to the first step X 1 and the air pin clogging It is because the effect of cancellation is lost.
  • FIG. 5 shows an example of a cross section substantially parallel to the gas flow direction in the passage shape example.
  • the first step X1 and the second step are formed so that the cross-sectional area of the first step X1 on the molding hole side is smaller than that of the second step Y1, as described above.
  • the connecting part Z "I of the part Y" 1 is a straight step.
  • FIG. 5 (B) shows another embodiment, in which the angle condition (0) of the connecting portion Z 2 between the first step portion X 2 and the second step portion Y 2 is given (0 Degrees ⁇ 90 degrees). Better Preferably it is 1 degree or more. This is because the air pin can be easily broken by the same effect as FIG. 5 (C) described later. In addition, there is no resistance when clogging is resolved. Further, 10 degrees or more is even more preferable.
  • the reason why the angle condition (0) is preferably 10 degrees or more is that if the angle condition (0) is 10 degrees or more, the forging material that has flowed in at the connecting portion Z 2 can be kept out of contact with the wall surface of the gas vent passage 3 4. Even in the case of contact, as a result, the forging process after clogging becomes easier to eliminate.
  • FIG. 5 (C) shows another embodiment, which is an example in which the first step portion X3 is formed in a tapered shape.
  • the air pin is easy to break at the opening 37 when the product is discharged, and the air pin hardly remains on the product side, and it is a shape that is actively clogged. .
  • FIG. 5 (D) shows another embodiment, in which the first step portion X4 is formed in a tapered taper shape.
  • the air pin tends to break at the second step Y4 when the product is discharged, and the pin length is controlled.
  • the root on the side of the opening portion 38 is thickened, the first step portion X4 hardly clogs, and a preferable result can be obtained.
  • FIG. 5 (E) shows another embodiment of the present invention, in which the shape of the first step portion X5 is made uneven with different diameters, and the cross-sectional shape of the gas vent passage is changed midway. .
  • the forging material is prevented from entering the first step portion X5, and the intruding forging material is easily cut.
  • the unevenness of the first step X5 is set to 0.01 to 0.3 mm, clogging can be achieved without hindering the forging material that has entered due to the gas pressure from being pushed down to the lower step. Can be resolved.
  • the contour of the uneven shape can be a rectangular shape, a triangular shape, a sawtooth shape, or the like.
  • FIGS. 6 (A), (C), and (D) are plan views of essential parts of the gas vent passage 34 used in the forging die of the present invention.
  • the cross-sectional shape is not particularly limited as long as a gas passage can be ensured, and the cross-sectional shape is not particularly limited, but a circular shape is preferable from the viewpoint of ease of manufacture.
  • Fig. 6 (A) shows a circular cross section.
  • the center O of the first step X and the second step Y are made to coincide.
  • the difference in size between the first step X and the second step Y is half.
  • the diameter is preferably 0.2 to 1 mm.
  • the difference is small, and the air pin may come into contact with the inner circumference of the second step Y, and there is a risk of (friction) resistance when the air pin is pushed and moved by the gas pressure. Because there is.
  • FIG. 6 (C) shows a case where the cross-sectional shape of the gas vent passage 34 is a square.
  • the second step portion Y has a shape in which the shape of the first step portion X is offset by 0.2 to “! Mm”.
  • FIG. 6 (D) shows the cross-sectional shape of the first step portion X as a circular shape. This is the case where the cross-sectional shape of the second step portion Y is square, and the distance between the cross-section shapes of the first step portion X and the second step portion Y should be 0.2 to 1 mm.
  • the cross-sectional shape is square, but it can be polygonal or elliptical.
  • the shape of the first step X and the second step Y is a circle, polygon, or ellipse as long as the size difference (distance) is in the range of 0.2 to 1 mm. Any combination is possible.
  • the position of the opening 3 6 in the gas vent passage 3 4 with respect to the die forging hole 3 5 is determined according to the product shape. It may be any of a part, a dead end, a part with a large thickness, or a part with a large change in thickness. In particular, it is preferable to provide the portion formed at the end in the forming order because such a portion has a large degree of the occurrence of thinning due to trapped air, and can eliminate the occurrence.
  • the installation site of the gas vent passage 3 4 can be determined, for example, as follows.
  • the knockout pin 33 is provided at a position where gas accumulation is likely to occur.
  • the target gas reservoir can be narrowed down from eight to four (b), (c), (O, (g).
  • FIG. 7 shows an enlarged view of the gas reservoir of the forging die 30 shown in FIG.
  • the last part to be molded is expected to be (I), (J). Therefore, it is preferable to provide them at these two locations (I) and (J).
  • the die is provided at the position where the gas reservoir (where the die and the forging material have become a closed space) force ⁇ contains the opening in the recess and Z or groove of the forming hole.
  • the gas vent passage 34 according to the present invention may be disposed in a die dividing portion (not shown) of the forging die.
  • the gas vent passage 34 according to the present invention does not need to be provided in the boundary portion of the sliding type in which the opening 36 is sliding with at least one of the divided bodies.
  • the direction of the gas vent passage 34 according to the present invention is not limited to being parallel to the forging direction (mold moving direction).
  • the mold can be designed easily.
  • the air pin when it is not parallel to the product discharge direction, the air pin can be easily cut, which is preferable.
  • the oblique direction (for example, 45 to 90 degrees, preferably 45 to 70 degrees with respect to the main forging direction or the moving direction of the mold) ) Is preferably set.
  • a mechanism for inserting the control pin 90 into the second step portion Y after discharging clogging during forging may be provided.
  • the control pin 90 is not retracted from the second stage Y when clogged and does not hinder the discharge of the air pin, and also enters (rises) the second stage Y during normal (not clogged).
  • the forging material is prevented from entering the next stage (second stage Y) in the gas vent passage 3 4.
  • the control pin diameter should be larger than the upper hole diameter and smaller than the lower hole, and the length should be shorter than the lower hole length, preferably at the first decimal place, for example, preferably 0 from the lower step length. . 0 1 to 1 mm shorter.
  • the degassing passage 34 can also function as a passage for discharging the lubricant applied in the mold forming hole. Since it may be used for the purpose of eliminating the lack of lubrication residue, the shape accuracy of the molded product is improved synergistically.
  • FIGS. 8 to 10 show the respective steps of material charging, molding, plugging, discharging, and next molding using the forging die of the present invention.
  • FIG. 8 (A) shows a process of placing the forging material 3 9 in the forging hole 35 and press forging.
  • the upper die 3 2 is lowered and molding is performed.
  • the molding is started from the shape part close to the mold part.
  • a closed space is formed in the forging material 39 and the die. In the closed space, the gas fills while being compressed.
  • FIGS. 9 (A), (B), and (C) the gas in the closed space formed by the forging die 30 and the forging material 39 is formed while being discharged from the degassing passage 3 4.
  • the In Fig. 9 (D) the molded product is discharged from the forging die with a knockout pin. At that time, the plug (air pin) 40 is broken and stays in the first step X of the gas vent passage 3 4 and clogging occurs.
  • Fig. 9 (E), (F) and Fig. 10 (A) show the case where clogging is avoided by gas pressure during the next forging.
  • Figures 10 (B), (C), (D), and (E) show the case where clogging is avoided by the gas pressure and the force of material forming during the next forging.
  • the forged molded product can be continuously manufactured stably by repeating the above operation.
  • the length of the first step portion X is clogged by setting so as to be eliminated by the patterns shown in FIGS. 10 (B), (C), (D), and (E). Resolution is more stable.
  • the forging die 30 of the present invention has at least one gas vent passage 34 described above.
  • a conventionally known gas vent passage may be combined. Even in such a case, the object of the present invention can be achieved by having the above-described gas vent passage.
  • the method for producing the forging material 39 used in the present invention may be any of continuous forging, extrusion, rolling and the like.
  • a round bar that is continuously manufactured is preferred because it is inexpensive.
  • SHOTIC material (registered trademark) manufactured by Showa Denko KK can be cited.
  • round bars that are continuously forged by the gas-pressed hot-top forging method have excellent internal soundness, fine crystal grains, and different crystal grains due to plastic working. Since there is no directionality, the resistance effect of the frictional resistance portion can be obtained stably, which is preferable.
  • the rod-shaped material is further cut into a predetermined length, and if necessary, is subjected to chamfering treatment and sent to the next process.
  • the forging device includes a forging machine 8 1, an upper die 8 3 attached to the upper bolster 8 2, and a lower die 8 5 attached to the lower polster 8 4.
  • An example of the mold used in the present invention is shown in FIG.
  • the forging die 30 includes a lower die 3 1 and an upper die 3 2 for forging a forged molded product from a metal material, and a knockout pin 3 3 for taking out the molded product from the lower die 3 2. It is configured to include a gas vent passage 3 4.
  • the molds 31 and 32 are provided with a forging hole 35 at the center. Also, the forged molded product has a rib 11 11 shape parallel to the operation direction axis of the upper mold as shown in FIG. Then, if necessary, a lubricant spray nozzle (not shown) equipped with a spray rotating device (not shown), a spray rotating device (not shown), and attached to the spraying device before and after the shaft (not shown). It is possible to install a lubricant applicator with (not shown).
  • the gas vent passage 34 is a gas vent passage having a plurality of step portions having different cross-sectional areas perpendicular to the forging direction (moving direction of the mold).
  • the present invention can be applied regardless of whether it is hot, warm, or cold.
  • the fluidity of the forging material changes depending on the temperature conditions of forging, and the behavior of the forging material and the penetration of the forging material into the gas vent passage changes.Therefore, it is necessary to design the mold according to it.
  • the clogging phenomenon can be solved regardless of the behavior of the forging material entering.
  • the prepared forging material 3 9 is pushed into the space (molding hole) 3 5 formed by the upper die 3 2 and the lower die 3 1, and the molded product is forged. Further, the molded material is taken out from the lower mold 3 2 by the knockout pin 3 3.
  • forging is preferably performed after applying a lubricant to the inner periphery of the mold.
  • the forging material 39 is preferably subjected to a lubricant treatment as necessary. Further, since the gas vent passage 3 4 is provided, the gas vent passage 3 4 also functions as a lubricant vent. Therefore, a synergistic effect can be obtained even if the gas vent passage 34 is installed in a place where there is a concern of seizing or lack of lubrication residue.
  • the shape of the air pin 40 to be formed is thin and short. For this reason, the rate of defective products can be reduced when they are removed in the post-treatment process. Also, the number of removal man-hours can be reduced.
  • FIG. 1 is an example in which a molded product having the shape of the rib 11 in FIG. 1 is manufactured using a forging die according to the present invention. Further, as the gas vent passage 34, the one shown in FIGS. 5 (A) and (B) was used.
  • the mold temperature was 1800 ° C
  • the temperature of the forging material was 4 10 ° C.
  • a 400 0 series AL alloy was used as the forging material.
  • Table 2 shows the forging results.
  • Example 2 the load is 2800 t, the diameter of the first step portion X is 0. 3 mm, the length of the first step portion X is 5.0 mm, the second step. Diameter of part Y is ⁇ 1. O m m, angle of connection Z 90 degrees, air pin length 1.5 mm, there was no clogging phenomenon.
  • Example 2 the load is 280 t, the diameter of the first step X is 00.5 mm, the length of the first step X is 5. Omm, the diameter of the second step Y is ⁇ 1.0 mm, the connection Z angle 90 degrees, air pin length 3. Omm, no clogging phenomenon.
  • Example 3 the load is 280 t, the diameter of the first step X is 00.5 mm, the length of the first step X is 1 2. Omm, the diameter of the second step Y is ⁇ 1.0 mm, connection The angle of part Z was 90 degrees, the air pin length was 3 mm, and it was not solved in the forging process immediately after clogging, but it was eliminated in the next forging process.
  • the load is 280 t
  • the diameter of the first step portion X is 0. 5 mm
  • the diameter of the second step portion Y is 0. 5 mm (no step portion).
  • the angle was 0 degree
  • the air pin length was 3 mm, and there was a clogging phenomenon.
  • the load is 280 t
  • the diameter of the first step part X is 0. 1 mm
  • the diameter of the second step part Y is 0. 1 mm (no step part)
  • the connection part The angle of Z was 0 degree
  • the air pin length was 14 mm, and there was no clogging phenomenon.
  • the air pins were long and defective products were generated in the next trimming process.
  • Fig. 13 shows a second embodiment of a forging die for forging a metal material and a forged molded product.
  • the die 30 includes a lower die 31 and an upper die.
  • Knockout pin 33 for removing mold 32 and molded product from inside lower mold 31 or venting It is composed of passages 3 and 4.
  • the lower die 3 1 and the upper die 3 2 are each provided with a forging hole 35 at the center.
  • This forging die is preferably used for forming a scroll compressor vortex body comprising a base plate surface 13 and a blade 14 force as shown in FIG.
  • the material is plastically flowed to the blade portion 14 to complete the forming.
  • Gas is confined in the part 12 when the convex part 12 is formed.
  • the gas vent passage is preferably provided at a location where the gas is confined. As a result, it is possible to suppress the occurrence of thinning due to trapped air.
  • the gas vent passage 34 is installed at a position corresponding to the convex portion 12 which is a portion where the gas is confined.
  • Fig. 14 shows a third embodiment of the forging die according to the present invention. Like the die shown in Fig. 13, the die 30 of this embodiment is vented to the lower die 31. Passage 3 4 is provided.
  • This forging die 30 is preferably used for molding a piston of an internal combustion engine having a head surface 15, a skirt portion 16, a rib portion 17 and a pin boss portion 18 as shown in FIG. It is done.
  • FIG. 15 is an enlarged cross-sectional view of the air reservoir during molding in the vicinity of the gas vent passage at the rib section 17 and the skirt section 16 of the internal combustion engine, and the appearance of the air reservoir Is a schematic.
  • the material is plastically flowed to the rib portion 17, the scar flange portion 16, and the pin boss portion 18, and the forming is completed.
  • the degassing passage 3 4 is preferably provided at the last part to be formed in the forming order. As a result, it is possible to suppress the occurrence of thinning due to trapped air.
  • the gas vent passage 34 is the part to be molded last. It is installed on the rib, skirt and pin boss. Industrial applicability
  • the forged molded product according to the present invention suppresses the occurrence of thinning due to air trapped in the molding hole of the mold even if it has a complicated shape, and is sufficiently forged in the molding hole. It is possible to obtain molded products with good dimensional accuracy by allowing the building materials to flow.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)

Abstract

La présente invention concerne un moule pour forgeage (30) comprenant un passage de mise à l’air libre (34) pour libérer le gaz confiné dans un trou de coulée (35) dans un moule de forgeage pendant le moulage. Le passage de mise à l’air libre comprend une pluralité de pièces étagées différentes entre elles dans une zone transversale perpendiculaire à la direction d’écoulement des gaz. L'aire de la pièce d’ouverture dans une première pièce étagée (X), qui fait face à la surface de la paroi du trou de coulée, est plus petite que l'aire de la pièce d’ouverture dans une deuxième pièce étagée (Y) qui lui est liée, et la pièce d’ouverture est prévue sur la surface de la paroi constituée d’une pièce de moule séparée ou de la surface de la paroi constituée d’une pièce de moule intégral. Selon la constitution ci-dessus, même lorsqu’un matériau de forgeage, entré dans le passage de mise à l’air libre, est cassé dans le refoulement du produit, lors du forgeage suivant, le matériau est poussé jusqu'à l'étape suivante par la pression des gaz. Ainsi, il n’y a aucune possibilité d'obstruer le passage de mise à l’air libre. En conséquence, même lorsque la forme du moule est compliquée, le gaz confiné dans le trou de coulée peut s’échapper progressivement, et, ainsi, il est possible de produire un produit forgé avec une bonne précision dimensionnelle dans lequel le risque de manque de matière est supprimé.
PCT/JP2006/315349 2005-07-29 2006-07-27 Moule pour forgeage, procédé de production de produit moulé pour le forgeage, et son produit forgé WO2007013675A1 (fr)

Priority Applications (1)

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JP2007526945A JPWO2007013675A1 (ja) 2005-07-29 2006-07-27 鍛造用金型、鍛造成形品製造方法とその鍛造成形品

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JP2005220307 2005-07-29
JP2005-220307 2005-07-29

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
JP2014237179A (ja) * 2014-08-08 2014-12-18 榎本機工株式会社 フランジ付長軸部品の鍛造加工方法
JP2016112565A (ja) * 2014-12-11 2016-06-23 三菱自動車工業株式会社 鍛造プレス装置
KR20160136005A (ko) * 2015-05-19 2016-11-29 김춘식 차량용 배터리 단자 클램프 제조장치 및 제조방법

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JPS51134630U (fr) * 1975-04-21 1976-10-30
JPS63165038A (ja) * 1986-12-26 1988-07-08 Aichi Steel Works Ltd 熱間鍛造型
JPH08187541A (ja) * 1994-12-30 1996-07-23 Kawasaki Yukou Kk 半溶融金属の鍛造用金型装置

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JPS6138733A (ja) * 1984-07-31 1986-02-24 Rizumu Jidosha Buhin Seizo Kk ボールスタッドの製造方法
JPH01202333A (ja) * 1988-02-05 1989-08-15 Sakamura Kikai Seisakusho:Kk 円錐案内部をもつロボット用ボルトの製造方法
JPH0615399A (ja) * 1992-06-29 1994-01-25 Mazda Motor Corp 鍛造金型装置
JPH0715133U (ja) * 1993-08-24 1995-03-14 武蔵精密工業株式会社 鍛造用金型
JPH09136133A (ja) * 1995-11-13 1997-05-27 Kobe Steel Ltd 鍛造金型

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Publication number Priority date Publication date Assignee Title
JPS51134630U (fr) * 1975-04-21 1976-10-30
JPS63165038A (ja) * 1986-12-26 1988-07-08 Aichi Steel Works Ltd 熱間鍛造型
JPH08187541A (ja) * 1994-12-30 1996-07-23 Kawasaki Yukou Kk 半溶融金属の鍛造用金型装置

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014237179A (ja) * 2014-08-08 2014-12-18 榎本機工株式会社 フランジ付長軸部品の鍛造加工方法
JP2016112565A (ja) * 2014-12-11 2016-06-23 三菱自動車工業株式会社 鍛造プレス装置
KR20160136005A (ko) * 2015-05-19 2016-11-29 김춘식 차량용 배터리 단자 클램프 제조장치 및 제조방법
KR101695870B1 (ko) * 2015-05-19 2017-01-13 김춘식 차량용 배터리 단자 클램프 제조장치 및 제조방법

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