JPH07164127A - Die for die casting - Google Patents

Abstract

PURPOSE:To make a die compact by fitting a pin for hole as cast to a ejecting plate fixing an ejecting pin and using the pin for hole as cast to a returning pin, too. CONSTITUTION:In a die 20 for die casting, the pin 24n for hole as cast is fitted to the ejecting plate 24 fixed to the ejecting pin 24p and used to the returning pin, too. By this constitution, it is unnecessary to arrange the returning pin at the position of the mating surface around a cavity 30 and the width of the mating surface can be made to be smaller than the conventional method. Further, as the pin 24n for hole as cast is arranged at the position penetrating the cavity 30, the area of the ejecting plate 24 supporting the pin 24n for hole as cast and the ejecting pin 24p can be made to be smaller than the projecting area of the cavity 30, and the space for incorporating the ejecting plate 24 in the die is made to be small. Therefore, the die 20 can be made to be compact.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die-cast metal having an extrusion pin for separating a cast product from the wall surface of a cavity when the mold is opened, and a return pin for returning the tip of the extrusion pin to the position of the wall surface of the cavity when the mold is clamped. Regarding the type.

[0002]

2. Description of the Related Art A related art relating to this is disclosed in Japanese Patent Laid-Open No. 1-3.
It is disclosed in Japanese Patent Publication No. 14127, and a sectional view showing the structure is shown in FIG. The die casting mold 1 is
A fixed die 12 mounted on the fixed side mounting plate 2 and a movable die 13 mounted on the movable side mounting plate 3 are provided, as shown in FIG.
As shown in FIG. 3, a cavity 10 is formed inside the mold 1 in a state where the mold is clamped. Further, a space 13s is provided inside the movable mold 13, and the pushing plate 14 is housed in the space 13s so as to be movable in the vertical direction in the figure. Then, on the extrusion plate 14, an extrusion pin 13p for separating the cast product from the wall surface of the cavity 10 when the die is opened, and the extrusion pin 13r when the die is clamped.
A return pin 13r for returning the tip of the to the position of the wall surface of the cavity 10 is attached. Here, a spring member (not shown) is provided between the push-out plate 14 and the movable-side mounting plate 3, and the push-out plate 14 is constantly pressed upward in the figure by a spring force. There is. by this,
In a state where the mold 1 is open, the push-out pin 13p projects from the wall surface (movable mold 13) of the cavity 10,
The return pin 13r projects from the mating surface 13m of the movable die 13.

With such a structure, when the tip of the return pin 13r abuts the mating surface 12m of the fixed die 12 in the process of the movable die 13 approaching the fixed die 12 during mold clamping, the movable die 13 is moved. The return pin 13r is pushed into the movable mold 13 by a distance approaching the fixed mold 12.
As a result, the pushing plate 14 moves downward in the figure against the spring force, and the pushing pin 13p is housed inside the movable mold 13. Then, in a state where the mold 1 is completely clamped, the extruding pin 13p is returned to a position where its tip is substantially aligned with the wall surface of the cavity 10. Further, when the movable die 13 separates from the fixed die 12 when the die is opened after the casting is completed, the pressing force from the fixed die 12 is not applied to the return pin 13r, and the pushing plate 14 is moved upward in the drawing by the spring force. The push pin 13p moves and the cavity 10 of the movable mold 13 moves.
Project from the wall surface of. As a result, the cast product is separated from the wall surface of the cavity to prevent the cast product from sticking.

[0004]

However, according to the above-mentioned conventional mold 1, the return pin 13r for returning the push-out pin 13p to the predetermined position at the time of mold clamping is provided at the position of the mating surface 13m of the movable mold 13. There is. Therefore,
In the mold 1, it is necessary to set the width of the mating surface 13m provided around the cavity 10 to a size that considers the mounting space of the return pin 13r. Further, the push plate 1 supporting the push pin 13p and the return pin 13r.
It is necessary to make the area of No. 4 larger than the projected area of the cavity 10. Therefore, a large space is required in the mold 1, the mold 1 becomes large, and the mold design is restricted. The technical problem of the present invention is to reduce the number of parts by making it possible to use both a cast pin and a return pin for forming a penetrating part in a cast product, and the return pin within the projected area of the cavity. As a result, the area of the push-out plate 14 is reduced so that the die can be made compact.

[0005]

The above-mentioned problems can be solved by a die casting mold having the following features. In a die-casting die having a push pin for separating a cast product from the wall surface of the cavity when the mold is opened, and a return pin that returns the tip of the push pin to the position of the wall surface of the cavity when the mold is clamped, a penetrating portion is formed in the cast product. The casting pin for the purpose is provided on the extrusion plate to which the extrusion pin is fixed, and is also used as the return pin.

[0006]

According to the present invention, since the casting pin is attached to the extrusion plate to which the extrusion pin is fixed and also serves as the return pin, the return pin is provided at the position of the mating surface around the cavity as in the prior art. You no longer need to place
The width of the mating surface can be made smaller than before. further,
Since the casting pin is arranged at a position penetrating the cavity, the area of the casting pin and the pushing plate supporting the pushing pin can be made smaller than the projected area of the cavity,
The storage space for the extrusion plate in the mold becomes smaller.

[0007]

【Example】

[First Embodiment] A die casting mold according to a first embodiment of the present invention will be described below with reference to FIG. The die casting mold 20 according to the present embodiment (hereinafter, referred to as the mold 20) includes a fixed main mold 22 having a fixed insert 22j and a movable insert 2.
3j is mounted to the movable main mold 23, and as shown in FIG. 1, a cavity 30 is formed inside the mold 20 in a state where the mold is clamped. Then, the molten metal press-fitted from the sleeve 26 provided in the fixed main mold 22 passes through the molten metal passage (not shown) and the cavity 3
It is designed to be injected into 0. Further, a space 22s is formed inside the fixed main mold 22 in the vicinity of the back side of the fixed insert 22j, and a fixed push pin 24p and a cast pin 24n are attached to the space 22s.
4 is stored. Here, the fixed extrusion pin 24p is a pin for extruding a cast product from the fixed insert 22j after casting, and the casting pin 24n is a pin used for forming a through hole in the cast product.

At the center of the extrusion plate 24, the casting pin 24n is attached at a right angle to the extrusion plate 24, and further, a plurality of the fixed extrusion pins 24p are provided around the casting pin 24n. It is also mounted at a right angle. Then, the cast pin 24n and the fixed push pin 24
It is inserted through the through holes 22h and 22k of the fixed main mold 22 and the fixed insert 22j so that p can move axially in the horizontal state. In addition, the space 22s is a pressing plate 22x.
A cover 24 is provided with a spring member 24b which is biased between the pressing plate 22x and the pushing plate 24 so as to separate the pushing plate 22 from the pressing plate 22x. As a result, in the mold open state, the pushing plate 24 is pushed to the leftmost position in the drawing by the spring force of the spring member 24b, and the protrusion amount of the casting pin 24n and the fixed pushing pin 24p from the fixed insert 22j is the maximum. become. Here, the length of the cast pin 24n is set to be longer than the length of the fixed push pin 24p by the thickness of the cavity 30. In addition, the movable main mold 23 and the movable insert 23j have a movable insert 23j after casting.
An extrusion pin 27 for horizontally extruding the cast product is horizontally mounted. Further, an extrusion cylinder (not shown) for moving the extrusion pin 27 in the axial direction is housed inside the movable main mold 23.

Next, the die casting mold 20 according to the present embodiment.
The operation of will be described. First, when the tip end surface of the cast pin 24n comes into contact with the cavity wall surface of the movable insert 23j while the movable main mold 23 approaches the fixed main mold 22 during mold clamping, the movable insert 23j moves the cast insert pin 24n. Is pressed in the axial direction. As a result, the casting pin 24n is fixed to the fixed insert 22j by the distance that the movable main mold 23 approaches the fixed main mold 22.
The pushing plate 24 is pushed into the fixed main mold 22, and the pushing plate 24 is moved in the direction of the pressing plate 22x against the spring force of the spring member 24b. Then, by moving the push-out plate 24, the fixed push-out pin 24p is housed inside the fixed insert 22j. Here, as described above, the casting pin 24n
Is set to be longer than the length of the fixed extrusion pin 24p by the thickness of the cavity 30, so that the mold 2
In the state where 0 is completely clamped, the fixed push-out pin 24p is returned to the inside of the fixed insert 22j to the position where the tip end thereof substantially coincides with the cavity wall surface of the fixed insert 22j.

Next, the molten metal is pressed into the cavity 30 through the sleeve 26 and the molten metal passage (not shown) to perform casting. When the movable main mold 23 separates from the fixed main mold 22 during mold opening after casting, the casting pin 24
The pressing force from the movable insert 23j is not applied to the tip of n, and the pushing plate 24 is moved in the direction away from the pressing plate 22x by the spring force of the spring member 24b. As a result, the fixed push pin 24p projects from the cavity wall surface of the fixed insert 22j, and the cast product is separated from the wall surface of the cavity 30 to prevent the sticking. In addition, the movable main mold 2
3, the extrusion pin 27 is actuated by the extrusion cylinder (not shown), and the cast product is moved to the cavity 3
It is separated from the 0 wall. As described above, according to the die casting mold 20 according to the present embodiment, the casting pin 24n is attached to the extrusion plate 24 to which the extrusion pin 24p is fixed and also serves as a return pin. Therefore, it is not necessary to dispose the return pin at the position of the mating surface around the cavity 30 as in the conventional case, and the width of the mating surface can be made smaller than in the conventional case. Further, since the casting pin 24n is arranged at a position penetrating the cavity 30, the area of the extrusion plate 24 that supports the casting pin 24n and the extrusion pin 24p can be made smaller than the projected area of the cavity 30. The storage space of the extrusion plate 24 in the mold is reduced. Therefore, the mold 20 can be made compact.

[Second Embodiment] FIG. 2 is a longitudinal sectional view of a main part of a die casting mold 40 according to a second embodiment of the present invention. Die casting mold 40 according to the present embodiment (hereinafter referred to as mold 4
0) includes a fixed die 42 and a movable die 43. As shown in FIG. 2, a cavity 50 is formed inside the die 40 in a state where the die is clamped. Further, a space 42s is formed inside the fixed mold 42 as in the mold 20 according to the first embodiment.
An extrusion plate 44, to which a fixed extrusion pin 44p and a third casting pin 44n are attached, is housed in 2s. Here, the third casting pin 44n is used for forming a through hole in a lateral direction (horizontal direction in the drawing) in a cast product.

The extruded plate 44 has the third
The cast-out pin 44n is attached at a right angle to the push-out plate 44, and further, the plurality of fixed push-out pins 44p are also attached at a right angle around the third cast-out pin 44n. The third casting pin 44n and the fixed push pin 44p are inserted into the through holes 42k and 42h of the fixed mold 42 so as to be movable in the axial direction in the horizontal state.
Further, the space 42s is covered by a pressing plate 42x, and a spring member 44b biased so as to separate the pushing plate 42x from the pressing plate 42x is mounted between the pressing plate 42x and the pushing plate 44. There is. As a result, in the mold open state, the pushing plate 44 is pushed to the leftmost position in the drawing by the spring force of the spring member 44b, and the protruding amount of the third casting pin 44n and the fixed pushing pin 44p from the fixed die 42 is It will be maximum. Further, the tip end of the third casting pin 44n is formed with a concave portion 44e having an arcuate side surface so that it can be brought into close contact with the side face of the first casting pin 45 described later. Here, when the mold clamping is completed, the tip recessed portion 4 of the third casting pin 44n
4e is in contact with the side surface of the first casting pin 45, the fixed pushing pin 44p and the third casting pin 44n so that the tip of the fixed pushing pin 44p substantially coincides with the position of the wall surface of the cavity 30. The length is set.

The movable die 43 has a cylindrical first casting pin 45 for forming a through hole in the longitudinal direction of the cast product (vertical direction to the paper surface), and the transverse direction of the cast product (horizontal direction in the drawing). And a second casting pin 47 for forming a through hole. The first casting pin 45 can be moved by a first hydraulic cylinder (not shown) in the longitudinal direction of the cavity 50 (the direction perpendicular to the plane of the drawing). In addition, the second casting pin 47 is connected to the first casting pin 45 by a second hydraulic cylinder (not shown).
It can be moved in the horizontal direction in the figure to a position where it comes into contact with the side surface of the. Here, the tip end of the second casting pin 47 is formed with a side surface arcuate recess 47e so that it can come into close contact with the side face of the first casting pin 45.

Next, the die casting mold 40 according to this embodiment.
The operation of will be described. First, at the time of mold clamping, when the first casting pin 45 of the movable die 43 is moved by the first hydraulic cylinder and positioned at the specified position, the second casting pin 47 is moved by the second hydraulic cylinder, The tip recess 47e is positioned at a position where it comes into contact with the side surface of the first casting pin 45. Next, in the process in which the movable die 43 approaches the fixed die 42, the side surface of the first die-cast pin 45 is changed to the third die-cast pin 4.
When it comes into contact with the tip concave portion 44e of 4n, the first cast pin 4
The side surface of 5 presses the third casting pin 44n in the axial direction.
As a result, the third die-casting pin 44n is pushed into the fixed die 42 by the distance that the movable die 43 approaches the fixed die 42, and the pushing plate 44 resists the spring force of the spring material 44b. Moved in the direction. Then, the pushing plate 44
Is moved, the fixed push-out pin 44p is housed in the fixed mold 42. In this way, when the mold 40 is completely clamped, the fixed push-out pin 44p is returned to the inside of the fixed mold 42 until the tip of the fixed push-out pin 44p substantially coincides with the cavity wall surface of the fixed insert 42j.

Next, the molten metal is pressed into the cavity 50 through the sleeve and the molten metal passage (not shown) to perform casting. Then, when the movable die 43 separates from the fixed die 42 during die opening after casting, the third die-casting pin 44n
The pressing force from the first casting pin 45 is no longer applied to the tip of the pushing plate 44, and the pushing plate 44 is moved in the direction away from the pressing plate 42x by the spring force of the spring member 44b. As a result, the fixed extruding pin 44p and the third casting pin 44n project from the cavity wall surface of the fixed mold 42, the cast product is separated from the wall surface of the cavity 50, and the cast product is prevented from sticking. As described above, also in the die casting mold 40 according to the present embodiment, the casting pin 44n is the extruding pin 44.
Since p is attached to the fixed extrusion plate 44 and also serves as the return pin, it is not necessary to arrange the return pin at the position of the mating surface around the cavity 50 as in the conventional case, and the mating surface of the mating surface can be eliminated. The width can be made smaller than before. Further, the casting pin 44n is provided in the cavity 50.
Since it is arranged at a position penetrating the
The area of the extrusion plate 44 supporting the extrusion pins 44p can be made smaller than the projected area of the cavity 50. Moreover, conventionally, the 1st-3rd casting pin 45,47,44n
Taking into account the thermal expansion of each casting pin 45, 47, 44n
Although a predetermined clearance is provided at the contact portion of the third casting pin 44n, the third casting pin 44n has a structure in which it is pressed against the side surface of the first casting pin 45 by the spring force of the spring material 44b. And the positional deviation of the first casting pin 45 does not occur during cooling.

[0016]

According to the present invention, since the cast pin also serves as the return pin for returning the extrusion pin, it is not necessary to arrange the return pin at the position of the mating surface around the cavity. Further, since the area of the extrusion plate supporting the casting pin and the extrusion pin can be made smaller than the projected area of the cavity, the space for storing the extrusion plate in the mold can be made small. Therefore, the mold can be made compact.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a die casting mold according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a main part of a die casting mold according to a second embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a main part of a conventional die casting mold.

[Explanation of symbols]

 20 Die-casting mold 22 Fixed main mold 22j Fixed insert 23 Movable main mold 23j Movable insert 24 Extrusion plate 24p Extrusion pin 24n Cast pin (return pin) 30 Cavity

Claims (1)

[Claims] 1. A die casting mold comprising: an extrusion pin for separating a cast product from a wall surface of a cavity when the mold is opened; and a return pin for returning a tip of the extrusion pin to a position of the wall surface of the cavity when the mold is clamped. A die-casting metal having a casting pin for forming a penetrating portion, the casting pin being attached to an extrusion plate to which the extrusion pin is fixed and also used as the return pin. Type.