JP2013128961A - Die for die casting and die casting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a die for die casting which can prevent the breakage of a core pin when the core pin is inserted into the pin insertion hole of a slide core, and further, form a through-hole in a die-cast product by providing a cavity between a mold to be set with the core pin and the slide core, and to provide a die casting method performed using the die for die casting.SOLUTION: Into the pin insertion hole 32A of a slide core 30, a core pin 40 elongating to a direction almost orthogonal to the slide direction of the slide core 30 is inserted. A molten metal M is injected and filled into the cavity 1A in a state where the tip of the core pin 40 is arranged at the inside of the cavity 1A. An exclusive hydraulic cylinder 41 for moving the core pin 40 forward and backward is connected to the base end of the core pin 40, and the core pin 40 is inserted into the pin insertion hole 32A with the hydraulic cylinder 41.

Description

  The present invention relates to a die-casting die and a die-casting method, and more particularly to a die-casting die for forming a die-cast product having a recess or a through hole and a die-casting method performed using the die-casting die.

  As a molding apparatus for molding a product having a recess or a through hole, a molding apparatus described in Patent Document 1 below is known. In the molding apparatus of Patent Document 1, the center of the pin insertion hole of the slide core is supported by floatingly supporting the core pin inserted into the pin insertion hole of the slide core by a movable mold clamping operation. Even if there is a misalignment between the center of the cast pin and the axis of the core pin, the core pin is smoothly inserted into the pin insertion hole of the slide core to prevent damage to the core pin. .

  However, since the molding apparatus of Patent Document 1 is configured to insert the core pin into the pin insertion hole by moving the slide core close to the core pin by a movable mold clamping operation, the pin insertion of the slide core is performed. If the tip of the core pin comes into contact with the opening edge of the pin insertion hole due to the misalignment between the center of the hole and the axis of the core pin, a very large force acts on the tip of the core pin, and the casting pin There is a problem that the tip of the punch pin is damaged.

  Moreover, since the molding apparatus of patent document 1 is the structure which carries out floating support of the casting pin by a fixed type | mold, it is necessary to prevent a molten metal from inserting into the part of the fixed type | mold which is supporting the casting pin floating, and a slide core There is a problem that a through hole cannot be formed by providing a cavity between the mold and the fixed mold.

Japanese Utility Model Publication No. 5-30830

  Therefore, the present invention has been made in view of the above-described conventional problems, and prevents the core pin from being damaged when the core pin is inserted into the pin insertion hole of the slide core, and the core pin is installed. It is an object of the present invention to provide a die-casting die capable of forming a through hole in a die-cast product by providing a cavity between the die and the slide core, and a die-casting method performed using the die-casting die.

  The present invention has been made to solve the above problems, and the die casting mold 1 according to the present invention is substantially orthogonal to the slide direction of the slide core 30 in the pin insertion hole 32A of the slide core 30. In the die-casting die 1 in which a molten metal M is injected and filled in the cavity 1A in a state in which a core pin 40 extending in the direction is inserted and the tip of the core pin 40 is disposed in the cavity 1A, the core pin Dedicated actuating means 41 for advancing and retracting the core pin 40 is connected to the base end of the core 40, and the core pin 40 is configured to be inserted into the pin insertion hole 32A by the actuating means 41. It is characterized by being.

  The die casting method according to the present invention is characterized in that die casting is performed using a die casting mold 1.

  According to the die casting mold and the die casting method of the present invention, it is possible to prevent the core pin from being damaged when the core pin is inserted into the pin insertion hole of the slide core. Further, if necessary, a cavity can be provided between the mold on which the core pin is installed and the slide core, and a through hole can be formed in the die cast product.

It is sectional drawing which shows the die-casting metal mold | die of this embodiment, and shows the state which mold closing was completed. It is sectional drawing which shows the die-cast metal mold | die of this embodiment, and shows the state which advanced the cast pin and was set in the cavity. FIG. 3 is an enlarged view of a main part of FIG. 2. It is sectional drawing which shows the die-casting die of this embodiment, and shows the state by which the molten metal was inject-filled in the cavity.

  A die casting mold according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the die casting mold 1 includes a fixed mold 10, a movable mold 20, and a slide core 30. The fixed mold 10 includes a fixed holder 11 and a fixed die 12. The fixed mold 10 is provided with a sleeve (not shown) and a plunger tip (not shown) that can slide in the sleeve, and a molten metal M such as an aluminum alloy can be supplied into the sleeve.

  A cast pin 40 is disposed in the cast pin accommodation hole 12 </ b> A formed in the fixed die 12. The core pin 40 is disposed such that its axis extends in a direction (right and left direction in FIG. 1) substantially orthogonal to a slide direction (up and down direction in FIG. 1) of a slide core 30 described later. The core pin 40 is continuous with a large diameter portion 40A having a diameter larger than the internal diameter of the core pin accommodation hole 12A, and the large diameter portion 40A with a step, and is slightly smaller than the internal diameter of the core pin accommodation hole 12A. A small-diameter portion 40B having an outer diameter and a tapered portion 40C having an outer diameter that gradually decreases from the small-diameter portion 40B toward the tip. A hydraulic cylinder 41 is fixed in a recess 11A formed in the fixed holder 11 by fixing means (not shown), and an output shaft 41A of the hydraulic cylinder 41 is placed in a core pin receiving hole 11B formed in the fixed holder 11. In FIG. 2, the base end of the core pin 40 is connected to a large diameter portion 40A via a washer 42. When the hydraulic cylinder 41 is driven, the core pin 40 can be moved back and forth in FIG. The hydraulic cylinder 41 corresponds to the operating means of the present invention.

  The movable mold 20 includes a movable holder 21 and a movable die 22. The movable mold 20 is movable in the left-right direction in FIG. Further, the movable die 20 is provided with an unillustrated extrusion pin, and is defined by a fixed die 12, a movable die 22, and a core die 32 described later by projecting the extrusion pin after opening the die. A die-cast product made of the molten metal M (see FIG. 4) solidified in the cavity 1A can be pushed out and removed from the movable mold 20.

  The movable die 22 is formed with a cast pin accommodating hole 22A composed of a large diameter hole 22a and a small diameter hole 22b, and the cast pin 43 is disposed in the cast pin accommodating hole 22A so as not to move. . The core pin 43 includes a large diameter portion 43A accommodated in the large diameter hole 22a, a small diameter portion 43B accommodated in the small diameter hole 22b, a first taper portion 43C protruding from the small diameter portion 43B into the cavity 1A, The first tapered portion 43C and a second tapered portion 43D that protrudes into the cavity 1A continuously with a step are provided. The diameter of the tip of the first taper portion 43C is larger than the diameter of the tip of the taper portion 40C of the core pin 40, and the diameter of the tip of the second taper portion 43D is larger than the diameter of the tip of the taper portion 40C of the core pin 40. small.

  The slide core 30 includes a core holder 31 and a core die 32. When the mold clamping shown in FIG. 1 is completed, the inclined surface 31A of the core holder 31 comes into contact with the inclined surface 11C of the fixed holder, and the molten core pressure prevents the slide core 30 from moving backward in FIG. doing. A hydraulic cylinder 43 is provided on the upper end side of the core holder 31, and an output shaft 43 </ b> A of the hydraulic cylinder 43 passes through a substantially plate-like support portion 44 and is inserted through a joint 45 and a coupling 46. It is connected to the upper end of the holder 31. Further, the support portion 44 is connected to the movable holder 21 via a support member 47, and the movable holder 21 cannot move with respect to the support portion 44. In the mold open state in which the movable mold 20 is separated from the fixed mold 10, the slide core 30 is configured to be slidable in the vertical direction in FIG.

  A pin insertion hole 32 </ b> A through which the above-described core pin 40 is inserted is formed at the lower end portion of the core die 32. The pin insertion hole 32A extends so as to penetrate the core die 32 in a direction substantially orthogonal to the sliding direction of the slide core 30, and the opening edge on the movable die 22 side from the opening edge 32a on the fixed die 12 side. It is formed as a tapered hole whose inner diameter gradually decreases toward 32b. As shown in FIG. 3, when the core pin 40 is advanced by the hydraulic cylinder 41 and the taper portion 40C of the core pin 40 is inserted into the pin insertion hole 32A, the tip portion of the taper portion 40C has an opening edge. 32b protrudes into the cavity 1A and contacts the tip of the second tapered portion 43D of the core pin 43. When the taper portion 40C of the core pin 40 is inserted into the pin insertion hole 32A, the rear end portion of the taper portion 40C is positioned in the cavity 1A defined by the core die 32 and the fixed die 12.

  In the die casting method, first, the slide core 30 is moved by driving the hydraulic cylinder 43 against the movable holder 21 of the die casting mold 1 in a state where the mold is opened (a state where the fixed mold 10 and the movable mold 20 are separated). 1, the core holder 31 is set to the position shown in FIG. Next, the die casting mold 1 is brought into a mold clamping completion state shown in FIG. 1 by performing mold clamping for moving the movable mold 20 and the slide core 30 toward the fixed mold 10. By performing the mold clamping, the fixed die 12, the movable die 22, and the core die 32 define the cavity 1A.

  Next, the hydraulic cylinder 41 is driven to advance the core pin 40 from the retracted position shown in FIG. 1 to the right in FIG. 1 and through the pin insertion hole 32A of the core die 32, as shown in FIG. The tip of the core pin 40 is brought into contact with the tip of the core pin 43.

  Next, a plunger tip (not shown) is slid in a sleeve (not shown) to inject and fill a molten metal M such as an aluminum alloy into the cavity 1A via a runner and a gate (not shown) (see FIG. 4). Next, the molten metal in the cavity 1A is cooled and solidified, and then the hydraulic cylinder 41 is driven to retract the cast pin 40 to the retracted position shown in FIG. Next, the mold is opened by separating the slide core 30, the movable mold 20, and the die-cast product attached thereto from the fixed mold 10. Next, by driving the hydraulic cylinder 43, the slide core 30 is slid upward in FIG. 1, and the core die 32 is separated from the die-cast product. Next, the die-cast product is removed from the movable mold 20 with an unillustrated extrusion pin. The above is the die casting method.

  Insertion of the casting pin 40 into the pin insertion hole 32A of the slide core 30 is performed by the hydraulic cylinder 41 as a dedicated operating means. Therefore, when inserting the pin insertion hole 32A with the casting pin 40, the casting pin 40 is inserted. Even if the pin contacts the pin insertion hole 32A, an excessive force does not act on the core pin 40, and the core pin 40 can be prevented from being damaged.

  The core pin 40 includes a tapered portion 40C that gradually decreases in diameter toward the tip, and the tapered portion 40C is configured to be inserted into a pin insertion hole 32A formed as a tapered hole in the slide core 30. Therefore, it is possible to prevent the tip of the core pin 40 from coming into contact with the opening edge 32a of the pin insertion hole 32A when the pin insertion hole 32A of the core pin 40 is inserted.

  A through hole can be formed in the die-cast product by abutting the core pin 40 with the core pin 43 of the movable die 20 and injecting and filling the molten metal into the cavity 1A. Further, since the cavity 1A is also defined between the fixed die 12 (fixed die 10) and the core die 32 (slide core 30), the die casting is also performed by the proximal end portion of the taper portion 40C of the core pin 40. A through-hole can be formed in the product.

  The die casting mold and the die casting method according to the present invention are not limited to the above-described embodiments, and various modifications and improvements can be made within the scope described in the claims. For example, in the embodiment described above, the core pin 40 is provided on the fixed die 10, but may be provided on the movable die 20. Alternatively, a cast pin is provided on a second slide core that is slidable in a direction substantially orthogonal to the slide direction of the first slide core having a pin insertion hole, and the base end of the cast pin Alternatively, a dedicated hydraulic cylinder may be connected to advance and retract the cast pin. If the core pin is inserted into the pin insertion hole of the first slide core by a dedicated hydraulic cylinder smaller than the hydraulic cylinder for sliding the second slide core, the core pin is inserted through the pin. Even if it contacts the hole, an excessive force is not applied to the core pin, and the core pin can be prevented from being damaged. In this case, the second slide core corresponds to a mold in which the core pin is installed.

  In the above-described embodiment, the core pin 40 is abutted with the core pin 43 to form a through hole in the die-cast product. However, the core pin 40 has its tip positioned in the cavity 1A. A concave part may be formed in the die-cast product.

  In the above-described embodiment, the cavity 1A is also defined between the fixed die 12 and the core die 32, and a through hole is formed in the die-cast product by the proximal end portion of the taper portion 40C of the core pin 40. However, the cavity 1 </ b> A may not be defined between the fixed die 12 and the core die 32.

DESCRIPTION OF SYMBOLS 1 Die-cast metal mold | die 10 Fixed type | mold 20 Movable type | mold 30 Slide core 32A Pin insertion hole 40 Casting pin 40C Taper part 41 Hydraulic cylinder

Claims (2)

A core pin extending in a direction substantially perpendicular to the slide direction of the slide core is inserted into the pin insertion hole of the slide core, and the tip of the core pin is disposed in the cavity. In die casting molds where metal melt is injected and filled,
Dedicated actuating means for advancing and retracting the core pin is connected to the base end of the core pin,
The die casting mold, wherein the cast pin is configured to be inserted into the pin insertion hole by the operating means.   A die casting method, wherein die casting is performed using the die casting mold according to claim 1.

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