JP2011062705A - Die-casting die - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a die-casting die capable of smoothly pulling out a core without damaging it even when hard ferrous casting flash is generated at a contact surface of the core and a positioning part inside a fixed mold. <P>SOLUTION: The core 5 is arranged inside the first recess of the fixed mold 12 in the die-casting die 2 for forming a ferrous component by die-casting. The core 5 is separated together with a movable mold 11 from the fixed mold 12 while being interposed between molded articles when the movable mold 11 is separated from the fixed mold 12 after die-casting. A plurality of the positioning parts 14 contact with the core 5 for positioning the core 5 inside the fixed mold 12. The contact surfaces 5a, 14a, 5b, and 14b where the positioning part 14 contacts with the core 5 are tilted in a direction of expanding the outer shape dimension of the core 5 to the pulling out direction of the core 5 relative to the fixed mold 12. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a die cast mold having a placement core.

  Conventionally, when a metal molded product is molded, die casting is performed in which molten metal is injected into the mold to perform molding. In the die-cast machine, after the molded product is injection-molded, the movable mold is separated from the fixed mold, whereby the fixed mold and the movable mold are separated at the dividing surface, and the molded product can be taken out.

  At this time, if it is necessary to pull out the molded product to the divided surface side, and the shape of the molded product is such that the molded product cannot be pulled out even if the divided surface is taken into account, the molded product should be There is a case of molding (see Patent Document 1 (Japanese Patent Laid-Open No. 7-16844) and Patent Document 2 (Japanese Patent Laid-Open No. 2001-212850)).

  When die casting is performed using such a placement core, first, the placement core is positioned at a predetermined position inside the fixed mold, and then the fixed mold and the movable mold are combined and clamped, and then the cavity inside the mold is placed. The molten metal is injected into the die casting. After molding, the movable mold is separated from the fixed mold and the mold is opened.

  When the mold is opened, the placing core comes out of the fixed mold together with the molded product, and is separated from the fixed mold together with the movable mold. Thereby, a molded product and a placement core can be taken out from a shaping | molding die (refer patent document 2).

  Thus, in order for the placement core to come out of the fixed mold as the movable mold moves, the contact surface between the placement core and the positioning portion inside the fixed mold extends in parallel with the removal direction of the placement core.

  Die-cast molding using a standing core is a technique that has been performed in the field of die-cast molding using a non-ferrous metal material such as aluminum. Such a non-ferrous metal material such as aluminum has a lower hardness than a placement core made of an iron-based material and a positioning portion inside the fixed mold around it. For this reason, even if a casting burr generated during molding is formed in the gap between the fixed mold and the placing core, the placing core, the positioning portion, etc. are not damaged by the casting burr of the non-ferrous metal material when the mold is opened.

  However, when a hard iron-based part is die-casted as a molded product, the hardness of the placing core and the fixed mold body used as the placing core and the hardness of the cast burr of the iron-based material are close to each other. For this reason, when molten metal is injected, a casting burr is generated on the contact surface between the positioning part inside the fixed mold and the placing core, so that the placing core is caught on the casting burr and the positioning part inside the fixed mold is being placed. The contact surface with the child may be damaged.

  In addition, in this way, if the contact surface between the positioning portion inside the fixed mold and the placement core is damaged, the placement core and the molded product after injection fitted to the placement core cannot be removed from the inside of the fixed mold. There is a risk that.

  Furthermore, even if the scratches generated on the contact surface between the positioning part inside the fixed mold and the placing core are polished and repaired to some extent, the scratches become deeper with each injection, so the mold must be replaced. There is a problem that the mold life is shortened.

  Furthermore, it takes time to repair the scratches on the positioning portion and the placement core inside the fixed mold, and it may not be possible to satisfy the production cycle time. Or the production line for repair may be stopped.

  An object of the present invention is to provide a die-cast molding die that can be smoothly pulled out without damaging the placing core even if a hard iron burr is generated on the contact surface between the placing core and the positioning portion inside the fixed die. Is to provide.

The die-casting mold of the first invention is a die-casting mold for die-casting iron parts. The die-cast mold includes a fixed mold, a movable mold, a placement core, and a plurality of positioning portions. The fixed mold has a first recess. A 1st recessed part forms a part of cavity corresponding to the external shape of a molded article. The movable mold has a second recess. The second recess forms another part of the cavity. The movable mold can reciprocate in a direction approaching the fixed mold and a direction away from the fixed mold. The placement core is disposed inside the fixed first recess. When the movable core is separated from the fixed mold after die casting, the placing core is separated from the fixed mold together with the movable mold in a state of being sandwiched between the molded products. The plurality of positioning portions are in contact with the placement core in order to position the placement core within the fixed mold. The contact surface where the positioning portion and the placing core come into contact is inclined in a direction in which the outer dimension of the placing core is enlarged with respect to the direction in which the placing core is removed from the fixed mold.
Here, the contact surface where the positioning portion and the placement core in the fixed mold come into contact with each other is inclined in the direction of enlarging the outer dimension of the placement core with respect to the drawing direction of the placement core with respect to the fixed mold. Therefore, even if an iron-based hard cast burr occurs on the contact surface between the placing core and the positioning portion, the placing core can be smoothly pulled out without damaging it, and productivity is improved.

  The die cast mold of the second invention is the die cast mold of the first invention, and the plurality of positioning portions are composed of a plurality of insert blocks. The plurality of insert blocks are detachably attached to the fixed mold. Each of the plurality of insert blocks has at least one contact surface.

  Here, a plurality of positioning portions are composed of a plurality of insert blocks that are detachably attached to a fixed mold, and each of the plurality of insert blocks has at least one contact surface. As described above, since the placing core is positioned by the contact surface of the insert block, even if wear or damage occurs, only the insert block needs to be replaced, so that the cost for repair and maintenance can be reduced.

  The die-casting mold of the third invention is the die-casting mold of the second invention, and the contact surface has a first contact surface and a second contact surface that intersect each other. The first contact surface and the second contact surface are inclined in a direction in which the outer dimension of the placing core is enlarged with respect to the direction in which the placing core is removed from the fixed mold.

  Here, the contact surface has a first contact surface and a second contact surface that intersect with each other, and the first contact surface and the second contact surface are arranged in the direction of the placement core with respect to the stationary core with respect to the stationary mold. Since each insert block has two contact surfaces because it is inclined in the direction of expanding the external dimensions, adjustment when the insert block is changed by positioning two surfaces with one insert block Less time is needed. In addition, it is possible to reduce the changeover time by reducing the number of attachments as compared with the case where all the insert blocks are separated. Moreover, the placing core can be accurately positioned at a predetermined position.

  The die cast mold of the fourth invention is the die cast mold of the second invention, and the insert block is made of a material harder than the fixed mold.

  Here, since the insert block is made of a material harder than the fixed mold, if most or all of the fixed mold is made of a hard material, the cost becomes high. The cost of manufacturing etc. can be reduced by using it. In addition, it is possible to extend the life of the insert block.

  According to the first invention, even if an iron-based hard cast burr occurs on the contact surface between the placing core and the positioning portion after molding, the placing core can be smoothly removed without being damaged. Moreover, since the generation | occurrence | production of the damage | wound by a casting burr | flash can be suppressed, the lifetime of a placement core and a fixed mold | type is extended. This also improves the productivity of the molded product.

  According to the second aspect of the invention, even when wear or damage occurs, only the insert block needs to be replaced, so that the cost for repair and maintenance can be reduced.

  According to the third invention, since each insert block has two contact surfaces, the adjustment time at the time of changing the insert block can be reduced by positioning the two surfaces with one insert block. In addition, it is possible to reduce the changeover time by reducing the number of attachments as compared with the case where all the insert blocks are separated. Moreover, the placing core can be accurately positioned at a predetermined position.

  According to the fourth invention, if most or all of the fixed mold is made of a hard material, the cost increases. However, the cost of manufacturing and the like can be reduced by using a high-hardness material with the insert block as a separate object. In addition, the life of the insert block can be extended.

The block diagram of the die-casting shaping | molding die concerning embodiment of this invention. The figure which looked at the fixed mold | type of FIG. 1, a placement core, and an insert block from the movable mold | type side. The perspective view of the placing core of FIG. FIG. 2 is a top view of the placing core in FIG. 1. FIG. 3 is an enlarged view of a lower end of a side surface of the placing core in FIG. 1. FIG. 2 is an enlarged cross-sectional view of a contact surface between the placement core and the fixed mold in FIG. 1 and shows a state before the placement core is pulled out. FIG. 2 is an enlarged cross-sectional view of a contact surface between the placement core and the fixed mold in FIG. 1, and shows a state in the middle of removing the placement core. The figure which looked at what the scroll member after setting, the placing core, the runner, and the material remainder of FIG. 1 were united from the front side of the spiral part. The figure which looked at what the scroll member after the shaping | molding of FIG. 1, the placing core, the runner, and the material remainder were united. The figure which looked at the scroll member after the shaping | molding of FIG. 1, the placing core, the runner, and the material remainder from the back side with respect to the spiral part. It is process drawing of the die-cast shaping | molding method using the shaping | molding apparatus of FIG. 1, Comprising: The figure of an initial state. It is process drawing of the die-cast shaping | molding method using the shaping | molding apparatus of FIG. 1, Comprising: The figure of a mold clamping process. It is process drawing of the die-cast shaping | molding method using the shaping | molding apparatus of FIG. 1, Comprising: The figure of a material injection | pouring process. It is process drawing of the die-cast shaping | molding method using the shaping | molding apparatus of FIG. 1, Comprising: The figure of a filling process. It is process drawing of the die-cast shaping | molding method using the shaping | molding apparatus of FIG. 1, Comprising: The figure of the state of filling completion. It is process drawing of the die-cast shaping | molding method using the shaping | molding apparatus of FIG. 1, Comprising: The figure of a mold opening process. It is process drawing of the die-cast shaping | molding method using the shaping | molding apparatus of FIG. 1, Comprising: The figure of an extrusion process. It is process drawing of the die-cast shaping | molding method using the shaping | molding apparatus of FIG. 1, Comprising: The figure of a molded article taking-out process.

Next, as an embodiment of the die cast mold of the present invention, a die cast mold 2 and a die cast molding apparatus 1 having the same will be described with reference to the drawings.
<Configuration of die-cast molding apparatus 1>
A die cast molding apparatus 1 (hereinafter referred to as a molding apparatus 1) shown in FIG. 1 is a molding apparatus that performs die casting of an iron-based component. The molding apparatus 1 is formed as an iron-based part, for example, on a movable scroll of a scroll compressor, that is, on the root side of the spiral portion 51 and the spiral portion 51 as shown in FIGS. A scroll member 50 having a plate-shaped end plate 52 and a columnar boss 53 formed on the opposite side of the spiral portion 51 in the end plate 52 is formed.

  The molding apparatus 1 includes a die-cast mold 2 (hereinafter referred to as a mold 2) for die-casting a scroll member 50 that is an iron-based component, a spiral extrusion pin 3, a material filling mechanism 6, and an extrusion pin. A drive mechanism 7 and a movable drive stage 8 are provided.

  In this molding apparatus 1, the material filling mechanism 6 fills the inside of the mold 2 with a semi-molten / semi-solid metal material C, which is an iron-based semi-molten or semi-solid metal material, by applying pressure to the scroll member 50. Die-casting is possible.

  After the scroll member 50 is formed, one movable mold 11 constituting the mold 2 slides on the movable drive stage 8 and is separated from the other fixed mold 12 (see FIG. 16). Thereafter, the scroll push pin 3 and the other push pins 9 are pushed into the movable die 11 by the push pin driving mechanism 7, whereby the scroll member 50 is placed from the inside of the movable die 11 and taken out while being sandwiched by the core 5. (See FIG. 17).

Hereinafter, the mold 2 and the spiral extrusion pin 3 will be described in more detail in separate items.
<Configuration of die casting mold 2>
As shown in FIG. 1, the mold 2 includes a movable mold 11 that reciprocates along a movable drive stage 8, a fixed mold 12 that is fixed on the movable drive stage 8, a placement core 5, And an insert block 14.

  As shown in FIG. 1, the movable mold 11 includes a spiral groove 13 a for forming a spiral portion 51 as a second recess of the present invention in the cavity 13 for forming the scroll member 50, and And a plate-like groove 13b for forming the end plate 52.

  As shown in FIG. 1, the fixed mold 12 has a cylindrical groove 13 c for forming a cylindrical boss 53 in the cavity 13 for forming the scroll member 50. Furthermore, the fixed mold 12 has a runner groove 13d for forming the runner 54 and an insertion recess 13e into which the placing core 5 is inserted.

  Here, the cylindrical groove 13c, the runner groove 13d, and the insertion recess 13e correspond to the first recess of the present invention.

  As shown in FIG. 2, the fixed mold 12 of the present embodiment can be divided into an outer portion 12 a and an inner portion 12 b. The inner portion 12b is made of a material having high heat resistance because it contacts the high-temperature semi-molten / semi-solidified metal M. The outer portion 12a and the inner portion 12b of the fixed mold 12 may be integrated.

  As shown in FIG. 1, the movable mold 11 is fixed to a movable platen 21, and reciprocates along the movable platen 21 in a direction approaching the fixed mold 12 and a direction away from the fixed mold 12. . The fixed mold 12 is fixed to the fixed platen 22 and is stationary on the stage 8.

  The placement core 5 is a casting space in the shape of a scroll member 50 formed when the movable mold 11 and the fixed mold 12 are joined, that is, a flow path for filling the cavity 13 with a semi-molten or semi-solid metal material. Is arranged inside the cavity 13 to form a runner 54.

  The placement core 5 is disposed between the cavity 13 and the runner 54 and is detachably attached to the fixed mold 12. That is, the placement core 5 is inserted into the fixed mold 12 from the left direction in FIG.

  The placing core 5 is semi-molten or half-melted in the thickness direction of the end plate 52 from the second surface 52b opposite to the first surface 52a from which the spiral portion 51 that is a protruding portion of the end plate 52 that is a flat plate portion protrudes. In order to form a runner 54 that is a flow path for filling the solidified metal, the runner 54 is disposed between the cavity 13 and the runner 54.

  The placement core 5 is disposed inside the insertion recess 13e of the fixed mold 12, and is moved from the fixed mold 12 together with the movable mold 11 while being sandwiched between the scroll members 50 when the movable mold 11 is separated from the fixed mold 12 after die casting. Leave.

  A groove 5c having a semicircular cross section of the placing core 5 forms a part of the cylindrical groove 13c of the fixed mold 12 shown in FIGS. 2 to 3 in order to form the cylindrical boss 53 shown in FIG. ing.

  The insert block 14 is a pair of left and right positioning portions that come into contact with the placing core 5 in order to position the placing core 5 inside the fixed mold 12. The pair of insert blocks 14 are prisms having an L-shaped cross section, and have a first contact surface 14 a and a second contact surface 14 b that contact the placing core 5. The distance between the pair of insert blocks 14 is equal to or greater than the width of the placing core 5 so that the entire width of the placing core 5 can be supported.

  The first contact surfaces 5a and 14a and the second contact surfaces 5b and 14b extending in the vertical direction in which the insert block 14 and the placement core 5 shown in FIG. 2 is inclined in a direction in which the outer dimension of the placing core 5 is enlarged (refer to FIGS. 4 to 7).

  For example, as shown in FIG. 4, the first contact surface 5 a extending vertically of the placement core 5 is inclined by θ1 (0.5 to 5 degrees, preferably about 2 degrees) in the drawing direction D of the placement core 5. (If the tilt angle is smaller than 0.5 degrees, the effect of the present invention cannot be obtained sufficiently, and if it is larger than 5 degrees, the placing core may fall). Correspondingly, the contact surface 14a extending vertically of the insert block 14 is also inclined in the same direction so as to be in surface contact with the first contact surface 5a of the placing core 5. On the other hand, as shown in FIG. 5, the second contact surface 5b extending to the side of the placing core 5 is inclined by θ2 (0.5 to 5 degrees, preferably about 2 degrees) in the drawing direction D of the placing core 5. (If the tilt angle is smaller than 0.5 degrees, the effect of the present invention cannot be obtained sufficiently, and if it is larger than 5 degrees, the placing core may fall). Correspondingly, the contact surface 14b extending laterally of the insert block 14 is also inclined in the same direction so as to be in surface contact with the second contact surface 5b of the placing core 5.

  As a result, even if iron-based hard cast burrs are generated on the contact surface between the placement core 5 and the positioning portion (for example, insert block), the placement core 5 and the insert block 14 are tapered. As shown in FIGS. 6 to 7, since the placing core 5 is pulled out, the gap t <b> 1 expands to t <b> 2 that is sufficiently larger than t <b> 1, so that the insert block 14 and the placing core 5 extend in the vertical direction. The first contact surfaces 5a, 14a and the second contact surfaces 5b, 14b extending in the lateral direction are hardly damaged by casting burr, and no new scratches are formed by the generated scratches.

  Note that the placement core 5 of the present embodiment is provided with a tapered protrusion 17 on the lower surface of the placement core 5 shown in FIGS. 2 and 5. The tapered protrusion 17 comes into contact with the protrusion 18 (see FIG. 1) of the movable mold 11, so that the placing core 5 is pushed up when the mold is clamped.

  Since the insert block 14 is detachably attached to the fixed mold 12 with screws or the like, the insert block 14 can be replaced without disassembling the fixed mold 12.

The insert block 14 is made of a material harder than the fixed mold 12. For example, when the fixed mold 12 uses prehardened steel or the like as mold steel, die steel or the like that is harder than the prehardened steel is used for the insert block 14. Thereby, the lifetime of the insert block 14 is extended.
<Configuration of spiral extrusion pin 3>
The spiral push pin 3 shown in FIG. 1 is attached to the push pin drive mechanism 7 so as to pass through a through-hole 15 formed in the movable die 11 and to appear at the tip of the spiral groove 13 a of the cavity 13. .

The spiral pushing pin 3 can push the scroll member 50 out of the movable mold 11 by pressing the tip 51 a of the spiral portion 51 of the scroll member 50 after the scroll member 50 is formed.
<Outline of die-cast molding method>
The scroll member 50 molded in the present embodiment is a movable scroll, and has a columnar boss 53 protruding on the second surface 52b opposite to the first surface 52a on which the spiral portion 51 of the end plate 52 protrudes. ing. Therefore, through the runner 54 which is a flow path for filling the cavity 13 with semi-molten or semi-solid metal, the melt 13 is partially melted from the boss 53 located at the center of the end plate 52 to the cavity 13 of the mold 2 of the scroll member 50. Alternatively, a semi-solid metal is filled.

  Note that one end of the runner 54 after molding is connected to the boss 53, while the other end is connected to the material remaining portion 55 on the material filling mechanism 6 side. Therefore, after the molded scroll member 50 is taken out from the mold 2 as shown in FIG. 13, the runner 54 and the material remaining portion 55 are cut off.

Further, in order to remove the scale on the surface of the semi-molten / semi-solidified metal material C immediately after coming out of the material filling mechanism 6, the material filling mechanism 6 is not disposed just behind the boss 53 but separated by the runner 54. Has been placed. As a result, the scale removed from the surface of the semi-molten / semi-solidified metal material C mainly accumulates in the material remaining portion 55, so that the scale is less mixed into the scroll member 50.
<Die-cast molding procedure>
Next, a die-cast molding method using the molding apparatus 1 of the embodiment will be described with reference to FIGS.

  First, in the initial state shown in FIG. 11, the placing core 5 is inserted into the insertion recess 13e. From the initial state shown in FIG. 11, the movable mold 11 is moved along the movable drive stage 8 as shown in FIG. 12, and the movable mold 11 and the fixed mold 12 are connected to form the cavity 13. (Clamping process).

  Next, as shown in FIG. 13, the semi-molten / semi-solidified metal material C is put into the material filling mechanism 6 (material injection process).

  Next, as shown in FIG. 14, the plunger 6 a of the material filling mechanism 6 is moved by hydraulic pressure or air pressure to fill the inside of the mold 2 with a pressure of the semi-molten / semi-solidified metal material C (filling process). . At this time, the semi-molten and semi-solid metal M in the middle of filling is filled into the cavity 13 through the runner groove 13d.

  Next, as shown in FIG. 15, when the semi-molten / semi-solid metal M is completely filled in the cavity 13 and then the semi-molten / semi-solid metal M is cooled and solidified, The scroll member 50 after molding is molded (filling is completed). The molded scroll member 50 is connected to a runner 54 and a material remaining portion 55 formed in the runner groove 13d.

  Next, as shown in FIG. 16, the movable mold 11 is moved along the movable drive stage 8, the movable mold 11 is separated from the fixed mold 12, and the mold 2 is opened (mold opening process). At this time, the placing core 5 moves toward the movable mold 11 while being sandwiched between the scroll member 50 and the runner 54. Further, in this mold opening process, the plunger 6a of the material filling mechanism 6 is such that the scroll member 50, the runner 54, and the placing core 5 are integrated and move away from the fixed mold 12 to the movable mold 11 side. So that it is pushed out a little.

  Next, as shown in FIG. 17, when the push pin driving mechanism 7 is driven to cause the swirl push pin 3 to protrude into the spiral groove 13 a of the movable die 11, the swirl push pin 3 is moved to the scroll member 50. Press the spiral part 51. Further, the other extruding pins 9 also project from the movable mold 11 by driving the extruding pin drive mechanism 7 and push the portions other than the spiral of the molded product. As a result, the molded scroll member 50, the runner 54, the remaining material 55, and the placing core 5 can be extruded from the movable mold 11 (extrusion process). Simultaneously with the extrusion, the plunger 6a is returned to the initial position.

  Next, as shown in FIG. 18, the molded scroll member 50, runner 54, remaining material 55, and placing core 5 are integrated from the inside of the mold 2 (molded product removal process). The placement core 5 is fitted to the scroll member 50 and the runner 54. At this time, the spiral push pin 3 and other push pins 9 are returned to the initial state of FIG.

  The molded scroll member 50 is cut at the boundary portion between the runner 54 and the boss 53 and separated from the runner 54 and the material remaining portion 55. At the same time, the placing core 5 sandwiched between the scroll member 50 and the runner 54 is also separated.

The final finish of the scroll member 50 can be finished to the dimensions and surface roughness required for the finished product of the scroll member 50 by applying a surface finish by machining.
<Features of the embodiment>
(1)
In the conventional placing core, the gap between the insert block and the insert block is constant, so that when the scratch is made, the scratch also damages the mold, and a straight scratch is formed in the drawing direction. However, in this embodiment, as shown in FIGS. 2 and 4 to 7, the first contact surfaces 5 a and 14 a and the second contact surface 5 b extending in the vertical direction in which the insert block 14 and the placing core 5 are in contact with each other, 14b is inclined in the direction of enlarging the outer dimension of the placing core 5 with respect to the drawing direction of the placing core 5 with respect to the fixed mold 12 (the direction on the near side perpendicular to the paper surface of FIG. 2).

  Thereby, as shown in FIGS. 6 to 7, since the gap is widened by pulling out the placing core 5, the first contact surface 5 a extending in the vertical direction in which the insert block 14 and the placing core 5 come into contact, 14a and the second contact surfaces 5b, 14b extending in the lateral direction are hardly damaged by casting burr, and no new scratch is formed by the generated scratch.

As a result, the placing core 5 can be smoothly pulled out from the fixed mold 12 after molding, and problems such as being unable to be removed from the fixed mold 12 are eliminated. Moreover, since the occurrence of scratches on the contact surfaces 5a, 14a and 5b, 14b of the insert block 14 and the placing core 5 can be suppressed by casting burr, the life of the placing core 5 and the insert block 14 and other molds is extended. Furthermore, since the occurrence of scratches on the placing core 5 and the insert block 14 can be suppressed, the number of production line stops due to scratch repair can be greatly reduced, and the productivity of the molded product such as the scroll member 50 can be improved. improves.
(2)
In the molding die 2 of the embodiment, a plurality of positioning portions are composed of a plurality of insert blocks 14 that are detachably attached to the fixed die 12, and each of the plurality of insert blocks 14 has at least one contact surface 14a and 14b. is doing. As described above, since the placing core 5 is positioned by the contact surfaces 14a and 14b of the insert block 14, even if wear or damage occurs, only the insert block 14 needs to be replaced, so that the cost of repair and maintenance can be reduced. .
(3)
In the molding die 2 of the embodiment, the contact surface of the insert block 14 has a first contact surface 14a and a second contact surface 14b that intersect at an angle or close to each other, and the first contact surface 14a and the second contact surface 14b. The contact surface 14b is inclined in the direction of enlarging the outer dimension of the placing core 5 with respect to the pulling direction D of the placing core 5 with respect to the fixed mold 12. Since each insert block 14 has two contact surfaces 14a and 14b, the time required for adjustment of the insert block 14 during the change-over can be reduced by positioning the two surfaces with one insert block 14. In addition, it is possible to reduce the changeover time by reducing the number of attachments as compared with the case where all the insert blocks 14 are separated. In addition, the placing core 5 can be accurately positioned at a predetermined position.
(4)
In the mold 2 of the embodiment, the insert block 4 is detachably attached to the fixed mold 12 by screwing or the like. Thereby, since the insert block 14 can be replaced, the life of the fixed mold 12 is extended.
(5)
In the molding die 2 of the embodiment, the insert block 14 is made of a material harder than the fixed die 12. Therefore, if most or all of the fixed die 12 is made of a hard material, the insert block 14 is expensive. The cost of manufacturing etc. can be reduced by using a high-hardness material as a separate object. Moreover, the life of the insert block 14 is extended.
<Modification>
In the above embodiment, as an example of the positioning portion for positioning the placement core 5 inside the fixed mold 12, an example in which the insert block 14 separate from the fixed mold 12 is provided has been described. It is not limited to this. As a modified example of the present invention, a step may be formed as a positioning portion on the inner wall of the fixed mold 12 without providing the insert block 14, and the placing core 5 may be positioned using the step.

  In this case as well, even if an iron-based hard cast burr occurs on the contact surface between the placing core 5 and the positioning portion, the placing core 5 can be smoothly removed without being damaged.

  The present invention can be widely applied to a die-casting mold for die-casting iron-based parts. Therefore, it can be widely applied to die casting molds for die casting using various iron-based materials such as molten, semi-molten or semi-solid iron-based materials.

1 Die-cast molding equipment (molding equipment)
2 Die-cast mold (mold)
3 Extrusion pin for spiral 5 Placement core 11 Movable mold 12 Fixed mold 13 Cavity (13a spiral groove, 13b flat groove, 13c cylindrical groove, 13d runner groove, 13e insertion recess)
14 Insert block 5a, 14a 1st contact surface 5b, 14b 2nd contact surface

JP 7-16844 A JP 2001-212850 A

Claims (4)

A die casting mold (2) for die casting iron parts,
A fixed mold (12) having a first recess that forms part of the cavity (13) corresponding to the outer shape of the molded product;
A movable mold (11) having a second recess forming another part of the cavity (13) and capable of reciprocating in a direction approaching the fixed mold (12) and a direction away from the fixed mold (12) When,
The movable mold (11) is disposed inside the first recess of the fixed mold (12) and is sandwiched between the molded articles when the movable mold (11) is separated from the fixed mold (12) after die casting. ) And the placing core (5) separated from the fixed mold (12),
A plurality of positioning portions in contact with the placing core (5) for positioning the placing core (5) inside the fixed mold (12);
With
The contact surfaces (5a, 5b, 14a, 14b) where the positioning portion and the placing core (5) are in contact with each other are arranged with respect to the direction in which the placing core (5) is removed from the fixed mold (12). Inclined in the direction of expanding the outer dimensions of the core (5),
Die-cast mold (2). The plurality of positioning portions include a plurality of insert blocks (14) detachably attached to the fixed mold (12),
Each of the plurality of insert blocks (14) has at least one contact surface (14a, 14b),
The die-casting mold (2) according to claim 1. The contact surfaces (14a, 14b) have a first contact surface (14a) and a second contact surface (14b) intersecting each other,
The first contact surface (14a) and the second contact surface (14b) expand the outer dimension of the placement core (5) with respect to the direction in which the placement core (5) is pulled out of the fixed mold (12). Each inclines in the direction of
The die-casting mold (2) according to claim 2. The insert block (14) is made of a material harder than the fixed mold (12).
The die-casting mold (2) according to claim 2.

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