JP2019198881A - Die-casting die and die-casting method - Google Patents

Abstract

To prevent a runner from being bent and broken when taking out a die cast product from a molding die.SOLUTION: A die-casting die 10 comprises a stationary die, a movable die 21, arranged to oppose to the stationary die, which can contact and separate from the stationary die and cores 31 and 41 that can move in a direction crossing a contacting/separating direction of the movable die 21, in which a cavity is defined by the stationary die, the movable die 21 and the cores 31 and 41 and a runner 51 is formed by intersecting with a sliding contact surface to the core 31 in the stationary die or in the movable die 21. The runner 51 thus formed has parts 51b and 51c in a bent shape that bend at a nearly right angle with respect to the contacting/separating direction of the movable die 21 with respect to the stationary die. Inside the parts 51b and 51c in a bent shape, R surfaces 51b' and 51c' are provided.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a die casting mold for casting a cast product and a die casting method performed using the die casting mold.

  As for die casting molds, a configuration having a fixed mold, a movable mold, and a core has been conventionally known. By sliding the core, the core is set to a movable mold, and the movable mold hits the fixed mold. A cavity is defined by the fixed mold, the movable mold, and the core through contact. In addition, after casting, in order to take out the cast product cast in the cavity, the movable mold and the core are separated from the fixed mold, the mold is opened, and the core is slid relative to the movable mold. The core is retracted from the casting. In addition, the structure of a general die-casting die is disclosed in, for example, Patent Document 1 below.

JP 2013-128961 A

  By the way, in the conventional die casting mold described above, the runner intersects the sliding contact surface with the core in the fixed mold or the movable mold, and the runner is further in the direction of separation of the movable mold from the fixed mold. In some cases, it is formed to have a bent portion that bends substantially at a right angle. And in the conventional die-casting metal mold | die, it was common that the bending shape part was formed in square shape. However, if the runner has a bent shape that bends substantially perpendicularly to the direction of separation of the movable mold from the fixed mold, the runner will fold inward from the short part of the runner when taking out the diecast product, so that the diecast product can be taken out well. There was no possibility. In addition, if the runner breaks when the mold is opened or the runner is taken out, the broken runner remains in the mold, so there is a possibility of mold breakage during the next casting. There was room.

  The present invention has been made in view of the problems existing in the above-described prior art, and an object thereof is a die casting mold of a type in which a runner intersects a sliding contact surface with a core in a movable mold. Therefore, it is an object of the present invention to provide a die casting mold and a die casting method capable of performing a smooth mold opening operation and a die casting product removing operation without causing the runner to bend or break when the die casting product is taken out from the mold.

  The present invention will be described below. In addition, in order to make an understanding of this invention easy, the reference number of an accompanying drawing is attached in parenthesis writing, However, This invention is not limited to the form of illustration by it.

  The die-casting mold (10) according to the present invention includes a fixed mold, a movable mold (21) that is disposed opposite to the fixed mold and can be separated from and attached to the fixed mold, and a separation / contact of the movable mold (21). A core (31, 41) movable in a direction crossing the direction, and defining a cavity with the fixed mold, the movable mold (21), and the core (31, 41); A die casting mold (10) formed by a runner (51) intersecting a sliding contact surface with the core (31) in the fixed mold or the movable mold (21), wherein the runner (51) And a bent shape portion (51b, 51c) that bends substantially perpendicularly to the direction of separation of the movable die (21) with respect to the fixed die, and has an R surface inside the bent shape portion (51b, 51c). (51b ', 51c') is provided It is intended to.

  In the die-casting die (10) according to the present invention, an R machining (23b ′) is applied to a runner forming portion (23) that is a formation site of the runner (51) in the fixed die or the movable die (21). Thus, the R surface (51b ′) of the runner (51) may be formed.

  Moreover, in the die-casting die (10) according to the present invention, the R surface (51c ′) provided inside the bent shape portion (51c) of the runner (51) is formed on the outer peripheral surface of the core (31). It may be formed by the provided R-shaped part (35).

  Furthermore, in the die-casting die (10) according to the present invention, when a plurality of the cores (31, 41) are provided and the R-shaped portion (35) is provided in one core (31), the R It is preferable that the shape portion (35) is configured not to face the other core (41).

  Moreover, this invention includes the die-casting method characterized by performing die casting using said die-casting die (10).

  According to the present invention, in a die casting mold of a type in which a runner intersects a sliding contact surface with a core in a fixed mold or a movable mold, when the die cast product is taken out from the mold, the runner is bent or broken. Therefore, it is possible to provide a die casting mold and a die casting method capable of performing a smooth mold opening operation and a die casting product taking-out operation.

It is an external view which shows the state with which the movable mold | type which comprises the die-casting mold which concerns on this embodiment, and two cores were combined. It is the figure by which the front view of the movable type was shown, and the cavity formation location arrange | positioned at the paper surface front side is simplified and shown. It is the principal part enlarged view by which the movable main part was shown. It is the principal part enlarged view by which the movable main part was shown. It is the principal part enlarged view which showed the assembly | attachment state of a movable type and a 2nd core. It is the principal part enlarged view which showed the assembly | attachment state of a 1st core and a 2nd core. It is a figure which shows the external appearance shape of a 1st core, in the figure, (a) shows a side view, (b) shows a front view, (c) shows a top view Yes. It is the external appearance perspective view which showed the shape of the runner inevitably generated by the casting by the die-casting die concerning this embodiment, and from three directions which are mutually different by the fractional drawing (a), (b), (c) in the figure. The external appearance perspective view is shown.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described with reference to the drawings. The following embodiments do not limit the invention according to each claim, and all combinations of features described in the embodiments are not necessarily essential to the solution means of the invention. .

  A die casting mold 10 according to the present embodiment will be described with reference to FIGS. Here, FIG. 1 is an external view showing a state in which the movable mold constituting the die casting mold according to the present embodiment and two cores are combined. FIG. 2 is a diagram showing a front view of a movable type, and shows a simplified cavity forming portion arranged on the front side of the drawing. 3 and 4 are enlarged views of the main part showing the movable main part. FIG. 5 is an enlarged view of a main part showing an assembled state of the movable mold and the second core. FIG. 6 is an enlarged view of a main part showing an assembled state of the first core and the second core. Moreover, FIG. 7 is a figure which shows the external appearance shape of a 1st core, the division figure (a) in a figure shows a side view, the division figure (b) shows a front view, and a division figure (c) Shows a top view. Further, FIG. 8 is an external perspective view showing the shape of a runner inevitably generated by casting with the die casting mold according to the present embodiment, and is a partial view (a), (b), (c) in the figure. Are external perspective views from three different directions.

  The die casting mold 10 according to the present embodiment includes a fixed mold (not shown), a movable mold 21, a first core 31, and a second core 41. A fixed mold (not shown) is a mold member that is fixedly disposed on a die casting apparatus (not shown). On the other hand, the movable mold 21 is a mold member that is disposed so as to face a fixed mold (not shown) and is detachable from the fixed mold. In addition, the first core 31 as one core and the second core 41 as another core are members that can move in a direction intersecting the direction of separation of the movable mold 21. In the die-casting die 10 shown in FIG. 1, it is assumed that a fixed die (not shown) is installed on the front side of the paper surface, whereas the movable die 21 is on the front side from the back side of the paper surface of FIG. It can move toward the side. Further, the first core 31 is movable in a direction orthogonally intersecting with the direction in which the movable mold 21 is separated from the fixed mold, that is, in the vertical direction on the paper surface of FIG. Furthermore, the second core 41 is movable in a direction orthogonally intersecting with the direction in which the movable mold 21 is separated from the fixed mold, that is, in the left-right direction on the paper surface of FIG. That is, in the die-casting die 10 according to the present embodiment, the first core 31 is set on the movable die 21 by sliding the first core 31 downward in FIG. The second core 41 is set in the movable mold 21 by sliding the second core 41 in the right direction in FIG. 1, and then the movable mold 21 is further directed toward the fixed mold (not shown). When the movable mold 21 abuts the fixed mold, the cavity is defined by the fixed mold, the movable mold 21, the first core 31, and the second core 41. Is called.

  Here, in FIG. 2, the hole-shaped portion 22 formed to define the cavity is shown in a simplified manner on the front side of the movable die 21. As shown in FIG. 2, the movable die 21 is formed with a runner forming portion 23 formed so as to be connected to the hole-shaped portion 22. The runner formation part 23 is a part used as an exhaust passage when the cavity is brought into a vacuum state when the molten metal is introduced into the cavity. In the die casting mold 10 according to the present embodiment, the runner forming portion 23 has a sliding contact surface with the first core 31 in the movable die 21 as is apparent from the comparison between the upper left portions of FIGS. 1 and 2. It is a metal mold having a structure formed by crossing.

  Moreover, about the runner formation part 23 formed in the movable mold | type 21 of the die-casting die 10 which concerns on this embodiment, it is a center straight groove | channel 23a of a substantially parallel direction with respect to the separation direction of the movable mold | type 21 with respect to the fixed mold | type not shown. And two end straight grooves 23b and 23c that are bent in a direction substantially perpendicular to the direction of separation of the movable mold 21 relative to a fixed mold (not shown). And R process 23b 'is formed in the groove bottom part of the joint of the central straight groove 23a which comprises the runner formation part 23, and the edge part straight curved groove 23b by the side of a cavity, On the other hand, the runner formation part An R groove 23c ′ is formed in the outer portion of the joint between the central straight groove 23a constituting the groove 23 and the end-side straight groove 23c on the cavity side.

  As shown in FIGS. 6 and 7, the location of the R groove 23 c ′ is a location where the R-shaped portion 35 provided on the outer peripheral surface of the first core 31 abuts. As is clear from comparison between FIGS. 5 and 6, the R-shaped portion 35 provided on the outer peripheral surface of the first core 31 is connected to the movable core 21 with the first core 31 and the second core 31. When the core 41 is assembled, the R-shaped portion 35 of the first core 31 and the outer peripheral surface of the second core 41 are configured not to face each other. That is, the first core 31 and the second core 41 are not in contact with each other at the position of the R-shaped portion 35 having a curvature, and the outer peripheries of the first core 31 and the second core 41 are in contact with each other. The strength of the mold 10 can be maintained.

  When casting is performed using the die casting mold 10 according to the present embodiment described above, the runner 51 is inevitably generated in addition to the die casting product. The external shape of the runner 51 is shown in FIG. The runner 51 includes a central straight portion 51a that is substantially parallel to the direction of separation of the movable mold 21 with respect to the fixed mold (not shown), and substantially perpendicular to the direction of separation of the movable mold 21 with respect to the fixed mold (not shown). It has two bent shape parts 51b and 51c that bend. The runner 51 is provided with R surfaces 51b 'and 51c' on the inner sides of the two bent portions 51b and 51c.

  Here, the relationship between the part constituting the runner 51 and the die casting mold 10 will be described. The central straight portion 51a is formed by the central straight groove 23a, and the bent shape portion 51b on the opposite cavity side is formed by the end straight curved groove 23b. The bent portion 51c on the cavity side is formed by the end straight groove 23c, and the R surface 51b ′ formed on the inner side of the curvature of the joint between the central straight portion 51a and the bent portion 51b is the R-process 23b. The R surface 51c ′ formed inside the curvature of the joint between the central straight portion 51a and the bent portion 51c is formed in the R shape portion 35 of the first core 31 in contact with the R groove 23c ′. Is formed by. As described above, by providing the R surfaces 51b ′ and 51c ′ on the inner sides of the bent portions 51b and 51c constituting the runner 51, the strength of the runner 51 is increased and a problem occurs when the die casting mold 10 is opened. It is possible to realize difficult configurations.

  As mentioned above, although preferred embodiment of this invention was described, the technical scope of this invention is not limited to the range as described in the said embodiment. Various modifications or improvements can be added to the embodiment. It is apparent from the description of the scope of claims that embodiments with such changes or improvements can be included in the technical scope of the present invention.

  The die-casting die and the die-casting method of the present invention are extremely useful in the field of die-casting methods for die-casting high-quality products, for example.

  10 die casting mold, 21 movable mold, 22 hole-shaped part, 23 runner forming part, 23a central straight groove, 23b, 23c end straight groove, 23b 'R machining, 23c' R groove, 31 first core (One core), 35 R-shaped part, 41 second core (other core), 51 runner, 51a central straight part, 51b, 51c bent shape part, 51b ', 51c' R surface.

Claims (5)

Fixed type,
A movable mold disposed opposite to the fixed mold and separable from the fixed mold;
A core movable in a direction crossing the direction of separation of the movable type;
The fixed die, the movable die, and the core define a cavity, and a die cast formed by a runner intersecting a sliding contact surface with the core in the fixed die or the movable die Mold,
The die runner is characterized in that the runner has a bent shape portion that is bent at a substantially right angle with respect to the moving and separating direction of the movable die with respect to the fixed die, and an R surface is provided inside the bent shape portion. Type. In the die-casting die according to claim 1,
A die-casting die, wherein an R surface of the runner is formed by applying R processing to a runner forming portion which is a portion where the runner is formed in the fixed die or the movable die. In the die-casting die according to claim 1 or 2,
The die casting mold, wherein the R surface provided inside the bent shape portion of the runner is formed by an R shape portion provided on an outer peripheral surface of the core. In the die-casting die according to claim 3,
A die-casting die, wherein a plurality of the cores are provided, and when the R-shaped part is provided in one core, the R-shaped part is configured not to face another core.   The die-casting method characterized by performing die-casting using the die-casting die of any one of Claims 1-4.