JP2005059044A - Die for molding semi-molten metal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a die for molding semi-molten metal which prevents the mixture of a solidified layer occurring in an injection sleeve of the semi-molten metal into a product with a simple structure without using a complicated mechanism. <P>SOLUTION: The die for molding the semi-molten metal is composed of a cavity part formed between a movable die and a fixed die, a horizontal casting type injection sleeve for injecting and filling the semi-molten metal to the cavity part, a biscuit part located in the fixed die, a projecting part constituting a part of the movable die and extended in the direction of the biscuit part, a space part for trapping and reservoiring a solidified material generated on the surface layer of the semi-molten metal to a lower area of the movable die, a solidified material trapping groove formed into the groove with a recessed shape for connecting the biscuit part and the space part to the lower part side of the projecting part, and a notched arcuate opening part located on the biscuit part side of the solidified material trapping groove and for leading the solidified material to the solidified material trapping groove. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a mold for molding a semi-molten metal, and in particular, a mold for molding a semi-molten metal in which the solid is trapped in a space different from the runner so that the solid does not enter the cavity. It relates to types.

  Conventionally, as described in Japanese Patent No. 3246363, a molten aluminum alloy having a superheat degree of less than 50 ° C. with respect to the liquidus temperature to which a micronizing agent is added is directly placed in a holding container without using a cooling jig. After pouring and holding for 30 seconds to 30 minutes while cooling to a molding temperature showing a liquid phase ratio of less than 75% of the alloy, a large number of fine spherical primary crystals are generated. It is known that a semi-molten metal having primary crystals can be obtained and pressure-molded.

  However, since the amount of latent heat that the semi-molten metal has is small, when the semi-molten metal is supplied into the injection sleeve, the surface layer portion of the semi-molten metal that contacts the inner wall surface of the injection sleeve is rapidly cooled, and a so-called solidified layer is formed. Easy to form. When such a solidified layer is mixed in the product, it cannot be completely fused with the surrounding healthy semi-molten metal portion, and a defect similar to a hot water boundary is generated.

In order to trap such solidified matter, an oxide film trap member having a diameter smaller than the inner diameter of the removable sleeve is attached to the injection end face of the injection sleeve before the semi-molten metal is filled into the cavity. There are things that are designed to capture things.
(For example, see Patent Document 1)

JP 2000-15429 (page 3, column 3, line 17-paragraph 3, column 4, line 34)

  However, the oxide film trap member described in Japanese Patent Application Laid-Open No. 2000-15429 is taken out together with the biscuits when the mold is taken out from the cavity by opening both molds after injecting the semi-molten metal. Therefore, when trying to obtain a molded body using a semi-molten metal, an oxide film trap member must be set for each shot, which is an obstacle to industrial continuous operation.

  The present invention pays attention to the above-mentioned problems of solidified layer generation, and prevents the mixing of the solidified layer generated in the semi-molten metal injection sleeve into the product with a simple structure without using a complicated mechanism. The object is to provide a mold for forming molten metal.

  In order to solve such a problem, in the first invention according to the present invention, a cavity part formed between a movable mold and a fixed mold, and a horizontal casting type in which semi-molten metal is injected and filled into the cavity part. An injection sleeve, a biscuit part located in the fixed mold, a projecting part that constitutes a part of the movable mold and extends in the direction of the biscuit part, and a lower part of the movable mold. A space for trapping and storing the solidified material generated on the surface layer of the molten metal, and a solidified trap groove forming a concave groove connecting the biscuit portion and the space on the lower side of the projecting portion And a notch arc opening that is positioned on the biscuit side of the coagulum trap groove and guides the coagulum to the coagulum trap groove.

  In the second invention, a cavity formed between the movable mold and the fixed mold, a lateral casting type injection sleeve for injecting and filling a semi-molten metal into the cavity, and a biscuit part positioned in the fixed mold And a projecting portion that constitutes a part of the movable mold and extends in the direction of the biscuit portion, and traps and stores the solidified material formed in the surface layer of the semi-molten metal in the lower area of the movable mold. And a solidified trap groove forming a concave groove connecting the biscuit portion and the space portion on the lower side of the protruding portion, and the protruding portion from the tip of the protruding portion. A non-circular arc portion that is fixed to the lower surface of the biscuits and extends in the direction of the biscuit portion, and a non-circular arc opening that is located on the biscuit portion side of the solidified trap groove and guides the solidified product to the solidified trap groove And consisted of parts.

  In the present invention, the solidified layer of the semi-molten metal surface layer generated in the injection sleeve is prevented from entering the product cavity, and an excellent molded body having a fine and uniform structure can be obtained.

  Hereinafter, specific embodiments of a mold for forming a semi-molten metal according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view of a molding die used for a horizontal clamping and horizontal casting method in which a projecting portion is provided on a movable die according to the present invention, and FIG. 2 is a front view as seen from AA in FIG. 3 is a longitudinal sectional view showing a state in which a semi-molten metal is pushed into an injection sleeve by an injection sleeve, FIG. 4 is a longitudinal sectional view of a mold structure provided with a notched arc portion according to the present invention, and FIG. It is the front view seen from BB of FIG.

  Hereinafter, Embodiment 1 and Embodiment 2 of the present invention will be described in detail with reference to FIGS.

  A first embodiment will be described with reference to FIGS. FIGS. 1 and 2 show a mold for forming a semi-molten metal, 4 is a fixed mold fixed to a fixed platen 6, 8 is a movable mold fixed to a movable platen 10, and 20 is an injection device. , 22 is an injection sleeve, 24 is a plunger tip, 26 is a plunger rod, and 28 is a semi-molten metal supply port.

  The movable mold 8 is moved forward and backward with respect to the fixed mold 4 by the operation of a cylinder device (not shown), and the movable mold 8 is predetermined with respect to the fixed mold 4 accordingly. The mold is clamped by the mold clamping force (FIG. 1) and the mold is opened apart from the fixed mold 4. In a state where the fixed mold 4 and the movable mold 8 are clamped, a cavity portion 30 is formed between both the molds 4 and 8.

  The fixed mold 4 is provided with an injection device 20 for high-pressure injection of the semi-molten metal M in the cavity portion 30. As shown in FIG. 1, the injection device 20 is provided with a step-shaped engraved portion on the back surface (on the side of the non-movable mold 8) of the fixed mold 4, and a protrusion larger than the outer diameter of the injection sleeve 22. The injection sleeve 22 is fixed in a state in which the locking portion 29 is locked.

  Further, it comprises a plunger tip 24 slidably fitted in the injection sleeve 22 and an injection cylinder (not shown) connected to a plunger rod 26 extending from the plunger tip 24.

  The injection device 20 advances the plunger tip 24 from the retracted position by the operation of the injection cylinder, whereby the semi-molten metal M supplied from the supply port 28 of the semi-molten metal M into the injection sleeve 22 is put into the cavity portion 30. High pressure injection.

  The movable mold 8 is provided with a projecting portion 50 extending in the direction of the biscuit portion 40 located in the fixed mold 4. In addition, a space 54 formed between the end of the fixed mold 4 is provided in the lower region of the movable mold 8.

  A coagulated substance trap groove 56 forming a concave groove connecting the biscuit part 40 and the space part 54 is provided on the lower side of the projecting part 50, and a notch arc opening 52 is formed on the biscuit part 40 side of the coagulated substance trap groove 56. Exists.

  Reference numeral 46 denotes an air vent groove for discharging the air staying in the cavity 30 when the cavity 30 is filled with the semi-molten metal M, and 48 is an overflow part.

  Reference numeral 60 denotes an air vent hole, which is an air vent hole through which the both end portions 62 (a, b) of the movable mold 8 are inserted from the space portion 54.

  In order to form the semi-molten metal M using both the above-described molds 4 and 8, first, the movable mold 8 is moved forward with respect to the fixed mold 4 by operating a cylinder device (not shown), and the fixed mold is fixed. The movable mold 8 is aligned with 4 and a clamping force is applied. Thereafter, a pre-heated semi-molten metal M supplied from the supply port 28 into the injection sleeve 22 is injected and filled into the cavity portion 30 by the operation of the plunger tip 24, and a high pressure is applied to form a molded product to be a product. To get.

  The semi-molten metal M was poured directly into a holding container without using a cooling jig, and a molten aluminum alloy having a superheating degree with respect to the liquidus temperature of less than 50 ° C. and added with a micronizing agent was used. It is held for 30 seconds to 30 minutes while being cooled to a molding temperature showing a liquid phase ratio of less than%, and a large number of fine spherical primary crystals are generated.

  A semi-molten metal M having a frustoconical shape is supplied from a holding container with a small diameter toward the runner portion 32 side (a large diameter is toward the plunger tip 24 side), and an injection having a circular cross section as shown in FIG. It will be in a sideways state so that the inner wall surface of the sleeve 22 may be contact | connected. The semi-molten metal M supplied to the injection sleeve 22 is rapidly cooled at the part in contact with the lower inner wall surface of the injection sleeve 22 having a low temperature, and a solidified layer is formed on the surface of the semi-molten metal M.

  Next, when the plunger tip 24 is advanced, the solidified layer existing below the semi-molten metal M flows into the space portion 54 through the solid-arc trapping groove 56 from the notch arc-shaped opening 52 and is reliably trapped. On the other hand, most of the semi-molten metal M not including the solidified layer is filled into the cavity 30 from the opening 29 through the runner 32.

  Note that the air staying inside the space portion 54 is discharged to the outside of the movable mold 8 through the air vent hole 60 as the solidified layer enters.

  Further, when the semi-molten metal M is filled in the cavity portion 30, the front end portion of the semi-molten metal M to be filled first (the upper end portion of the cavity portion 30 in FIG. 1) remains in the cavity portion 30. Air is discharged outside through the air vent groove 46. A part of the semi-molten metal M, which is continuously filled with the high pressure load in the cavity portion 30 by the advancement of the plunger tip 24, includes oxides accompanying the semi-molten metal M, a solidified layer generated in the runner portion 32 and the cavity portion 30, and the like. It reaches the overflow portion 48 together with impurities and is trapped here.

  FIG. 3 shows a state in which the plunger rod 26 and the plunger tip 24 have advanced from the state of FIG. 1 and the semi-molten metal M is filled in the mold. The cavity portion 30, the runner portion 32, the biscuit portion 40, the solidified trap groove 56, the space portion 54, and the overflow portion 48 are filled with the semi-molten metal M. At this time, impurities such as a solidified layer are present only in the solidified trap groove 56, the space 54, and the overflow portion 48, and are prevented from being mixed into the cavity portion 30 as a product.

  Thereafter, both molds 4 and 8 are cooled to quench and solidify the semi-molten metal M. Next, the movable mold 8 is retracted and separated from the fixed mold 4 to complete the mold opening. Subsequently, in order to remove the molded body that is still attached to the movable mold from the movable mold 4, the extrusion plate of the extrusion mechanism (not shown) advances and the extrusion pin pushes the molded body from the movable mold 8. . The molded body is gripped by a molded body carry-out device (not shown) and carried out of the mold.

  Thereafter, a release agent coating device (not shown) and a spray device including an air jet nozzle enter between the fixed mold 4 and the movable mold 8, and the release agent coating and air blowing are sequentially performed. The next casting preparation is completed.

  A second embodiment will be described with reference to FIGS. 4 and 5. Since the entire configuration of the second embodiment has already been described in the first embodiment with reference to FIGS. 1 to 3, only different portions will be described.

  The feature of the second embodiment is that the biscuit is fixed from the front end of the projecting portion 50 that constitutes a part of the movable mold 8 and extends in the direction of the biscuit portion 40 to be flush with the lower surface of the projecting portion 50. It is to provide a notch arc portion 70 extending in the direction of the portion 40.

  Since the cut-off arc portion 70 is provided, when the cavity 30 is filled with the semi-molten metal M as the plunger tip 24 advances, the solidified layer formed on the surface layer of the semi-molten metal M in contact with the bottom of the injection sleeve 22 It is reliably separated from the healthy part that does not contain coagulum. That is, the broken arc portion 70 separates the healthy portion of the semi-molten metal M from the portion containing the solidified material, and the healthy portion fills the cavity portion 30 through the runner portion 32 from the opening 64 and also contains the solidified material. The portion is allowed to flow into the space portion 54 through the coagulated substance trap groove 56 from the notch arc opening 52.

It is a longitudinal cross-sectional view of the molding die structure by the horizontal die-clamping horizontal casting system which provided the protrusion part in the movable die concerning this invention. It is the front view seen from AA of FIG. It is a longitudinal cross-sectional view showing the state by which the semi-molten metal was pushed by the injection sleeve, and was injection-filled in the metal mold | die. It is a longitudinal cross-sectional view of the metal mold | die structure which provided the notch arc part extended in the direction of a biscuit part in the protrusion end surface of a movable metal mold | die. It is the front view seen from BB of FIG.

Explanation of symbols

4 Fixed mold 6 Fixed platen 8 Movable mold 10 Movable platen 20 Injection device 22 Injection sleeve 24 Plunger tip 26 Plunger rod 28 Semi-molten metal supply port 29 Locking portion 30 Cavity portion 32 Runner portion 40 Biscuit portion 46 Air vent groove 48 Overflow part 50 Protruding part 52 Notch arc opening 54 Space part 56 Solidified substance trap groove 60 Air vent hole 62 (a, b) Both ends 64 of the fixed mold Opening part 70 Notch arc part

Claims (2)

A cavity formed between the movable mold and the fixed mold, a lateral casting type injection sleeve for injecting and filling semi-molten metal into the cavity, a biscuit section located in the fixed mold, and the movable mold A protruding portion extending in the direction of the biscuit portion, and a space portion for trapping and storing the solidified material generated in the surface layer of the semi-molten metal in the lower region of the movable mold, A coagulum trap groove forming a concave groove connecting the biscuit portion and the space portion on the lower side of the projecting portion, and a coagulum disposed on the biscuit portion side of the coagulum trap groove A mold for forming a semi-molten metal, characterized by comprising a cut-off arc opening that leads to an object trap groove. A cavity formed between the movable mold and the fixed mold, a lateral casting type injection sleeve for injecting and filling semi-molten metal into the cavity, a biscuit section located in the fixed mold, and the movable mold A protruding portion extending in the direction of the biscuit portion, and a space portion for trapping and storing the solidified material generated in the surface layer of the semi-molten metal in the lower region of the movable mold, A coagulum trap groove forming a concave groove connecting the biscuit portion and the space portion on the lower side of the projecting portion, and flush with the lower surface of the projecting portion from the tip of the projecting portion A non-circular arc portion that is fixed and extends in the direction of the biscuit portion, and a non-circular arc opening portion that is located on the biscuit portion side of the solidified trap groove and guides the solidified product to the solidified trap groove. A mold for forming a semi-molten metal.

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