JP2003245763A - Casting mold having acurad cylinder also serving as core - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold which can drive a piston rod to lock a core capable of freely moving vertically and an Acurad pin to prevent a shrinkage cavity after supplying molten steel to the inside of the cavity by one Acurad cylinder. <P>SOLUTION: The mold is so constituted that the core constituting a part of a cavity is arranged to be capable of freely moving vertically on the upper part side of the cavity formed in a movable mold, and at the same time, the Acurad pin is fixed to the Acurad cylinder arranged to the outside upper face part of the movable mold and the tip of the piston rod to move vertically inside the Acurad cylinder via a coupling, a space surrounding a flange is provided after penetrating upper/lower parts of the core, and the core is made to be capable of freely ascending/descending in a state that the core is locked to the coupling when the piston rod is moved vertically. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casting metal mold having an acurad cylinder also serving as a core for preventing shrinkage cavities when a molten metal is filled in a mold by low pressure casting or die casting to cast an aluminum molded product. It is about the type.

[0002]

2. Description of the Related Art Conventionally, when casting molten aluminum into a mold, if there are thin and thick portions, the thin portions are cooled and solidified faster than the thick portions, so casting is performed. Since the pressure did not reach the thick part and the molten metal could not be replenished, a shrinkage cavity was generated in the thick part.

Therefore, in order to prevent such shrinkage cavities, the gate area has been increased so that the molten metal is sufficiently effective during casting until solidification is completed in the product portion in the mold. The runner part was made thicker so that directional solidification was achieved. In addition to this prevention method,
The thin wall part was cast thicker than necessary, the solidification was delayed, and the casting pressure was transmitted to the thin wall part until late to prevent shrinkage cavities.

[0004]

However, there are the following problems in the conventional prevention of shrinkage cavities. That is, in the former case, since the gate area is increased, the casting ratio of the biscuit portion to the product portion is increased, and the product yield is reduced. Also, in the latter case, after casting, the portion that may have a small wall thickness was cast thicker than necessary, so it was cut and removed to a predetermined thickness, so the machining time becomes longer and There was a problem that the amount of molten metal was large and the loss of cutting powder was large.

In the present invention, focusing on the conventional problems, a piston rod for locking a vertically movable core and an acurad pin for preventing shrinkage cavities after hot water is supplied into a cavity are driven by one acurad cylinder. The purpose is to provide a possible mold.

[0006]

In order to solve such a problem, in the first invention according to the present invention, aluminum is provided in a cavity portion formed in both mold cavities of a movable mold and a fixed mold. A die cast mold for filling molten metal to obtain an aluminum product, in which a core forming a part of the cavity is movably arranged on the upper side of the cavity provided in the movable mold. At the same time, an acurad cylinder disposed on the outer upper surface of the movable mold and an acurad pin fixed to the tip of a piston rod that moves up and down in the acurad cylinder via a coupling, A space surrounding the flange is provided after penetrating the portion, and when the piston rod is moved up and down, the core can be moved up and down while being locked by the coupling.

In the second invention, which is mainly based on the first invention,
A limit switch for detecting the forward and backward limit positions of the core and the acurad pin is arranged on the side surface of the piston rod that moves up and down in the acurad cylinder.

[0008]

1 to 3 show an example in which the present invention is applied to a casting mold having an acurad cylinder that also serves as a core according to the present invention, and FIG. 1 is a sectional view when both molds of the present invention are released. 2 is a cross-sectional view when both molds in FIG. 1 are closed, and FIG. 3 is a cross-sectional view taken along the line AA in FIG.

The die casting machine is mainly composed of a die unit 10 and a casting unit 12. The mold device 10 includes a fixed mold 16 held by a fixed platen 14 and a movable mold 20 held by a movable platen 18. A column 24 is connected to the fixed platen 14 via a nut 22, and the movable platen 18 is movable along the column 24 in a direction toward and away from the fixed platen 14 by a toggle mechanism (not shown). Has been done.

A cavity portion 26, a runner portion 28, and a biscuit portion 30 are provided on the mating surface between the fixed die 16 and the movable die 20.
Is provided. The mold apparatus 10 is installed on the machine base 44, and the machine base 44 is installed so as to straddle a pit 48 recessed in the ground base 46.

The pouring device 12 is installed in the pit 48. The casting device 12 has a configuration in which an injection cylinder 50, a block 52, and a sleeve 54 are sequentially installed from the lower side. The injection cylinder 50 is supported by a receiving seat 56 fixed to the bottom surface of the pit 48 via a pin 58, and the upper end side of the injection cylinder 50 is tiltable about the pin 58 as a rotation center.

A piston 60 is installed in the injection cylinder 50, and a rod 62 extending upward is connected to the piston 60. The block 52 is provided with a cylinder hole 64 extending in the vertical direction. A docking ram 66 is inserted into the cylinder hole 64, and a lower end of the docking ram 66 is provided with a flange 68 formed on the upper surface of the injection cylinder 50. It is fixed. The sleeve 54 is connected to the upper side of the block 52 via a connecting member 69, and the upper end of the sleeve 54 can be inserted into the lower end of the biscuit portion 30 of the mold device 10.

The plunger tip 7 is placed in the sleeve 54.
0 is installed slidably, and the plunger tip 7
The lower end of the plunger 72 holding 0 is connected to the upper end of the rod 62 via a coupling 73.

A tilting cylinder 74 is provided on the side wall of the pit 48.
Is pivotally supported by a seat 76 and a pin 78 so as to be tiltable, and a rod 82 connected to a piston 80 of the tilt cylinder 74 has a tip at a joint 84 and a pin 8.
It is pivotally attached to the side surface of the flange 68 of the injection cylinder 50 via 6.

Reference numeral 90 is an extrusion plate, and 92 is an extrusion pin. When the cavity 26 is filled with molten aluminum and cooled to become an aluminum product, when the movable mold 20 is retracted and the mold is opened, the extrusion plate 90 is advanced and the extrusion pin 92 presses the aluminum product. , Movable mold 20
It has the role of extruding from and separating from.

Reference numeral 100 denotes a core / acurad combined device. The core / acurad combined device 100 comprises a limit switch 103, a piston rod 104, an acurad cylinder 105, a core 107, an acurad pin 108 and a coupling 110. ing.

The limit switch 103 is composed of a core backward limit switch 103a, an acurad backward limit switch 103b, and a core / acurad forward limit switch 103c.

A supporting leg 109 is erected on an upper part of the movable mold 20, and an acurad cylinder 105 is attached to an upper part of the supporting leg 109. A piston rod 104 extending downward from the center of the lower portion of the acurad cylinder 105 is attached, and is fixed to a piston in a hydraulic cylinder 105 (not shown) so as to be slidable.

A coupling 110 is fixed to the tip of the piston rod 104, and an acurad pin 108 is attached to the extension of the axial center of the piston rod 104 via the coupling 110.

Further, the core 107 is provided with a space of a certain size, and the coupling 110 is surrounded so that the coupling 110 can move up and down by supplying and discharging the hydraulic pressure sent to the acurad cylinder 105. It has become.
The size of the space portion of the core 107 has a size in consideration of the forward / backward stroke length of the Accurad pin 108.

The front sectional shape of the core 107 is the core 107.
As shown in FIG. 2, the lower half is formed in a convex shape 107a toward the fixed mold 16 and forms a part of the cavity portion 26 of the movable mold 20.

Further, the core 107 located on the movable mold 20.
When the convex shape 107a is combined with the concave part provided on the fixed mold 16 side as shown in FIG. 1, both the fixed mold 16 and the movable mold 20 can be closed.

Next, the operation of the casting die having the acurad cylinder that also serves as the core will be described.

First, as shown in FIG. 2, the mold release agent is sprayed while the fixed mold 16 and the movable mold 20 are opened and the spray device is lowered from above the space between the molds. Following the completion of release agent spray, hydraulic cylinder 1
When pressure oil is fed to 05, the lower surface of the coupling 110 contacts the lower surface of the space of the core 107 via the piston rod 104. At this time, the coupling 110 is further lowered and advanced. The core 107 is set in a predetermined mold.

Next, after fixing the fixed mold 16 and the movable mold 20 to each other, the mold clamping is completed. Thereafter, while supplying and discharging pressure oil to and from the hydraulic cylinder 105, the acurad pin 108 is connected to the acurarad backward limit switch 103b.
Move up and down until is hit.

At this time, the preparation for casting has already been completed,
The casting apparatus 12 operates in parallel with the series of operations. That is, the block 52 descends by releasing the hydraulic oil supplied into the cylinder hole 64, and the block 52 is seated on the injection cylinder 50.

Further, by releasing the hydraulic oil supplied to the head end side of the injection cylinder 50, the piston 60 is released.
Is lowered to the lower limit, and the plunger tip 70 is also lowered to the lower limit. When the rod 82 of the tilt cylinder 74 is projected in this state, the pouring device 12 tilts as a whole. Therefore, the molten aluminum is poured into the sleeve 54.

Then, the rod 82 of the tilt cylinder 74 is moved.
And the casting device 12 is set in the vertical posture. Next, hydraulic oil is introduced into the cylinder hole 64 of the block 52 to cause the docking ram 66 to project. As a result, the block 52 rises, and the sleeve 54 is inserted into the biscuit portion 30 of the mold device 10. Therefore, the injection cylinder 50
Oil is introduced into the head end chamber of the
Push up.

As a result, the plunger tip 70 rises, and the molten aluminum stored in the sleeve 54 is introduced into the cavity portion 26 via the bisquette portion 30, the runner portion 28, and the gate portion 27. The injection is completed when the molten aluminum fills the cavity 26.

Either a signal that the hydraulic pressure in the cylinder hole 64 rises as the molten aluminum is filled in the cavity 26 is picked up, or an injection stroke position signal (not shown) reaches a predetermined value. The timer is activated when the selected signal reaches a specified value. After that, when the time is up, pressure oil is fed to the hydraulic cylinder 105.

At the position where the lower surface of the coupling 110 contacts the lower surface of the space of the core 107 via the piston rod 104 engaged with the hydraulic cylinder 105, that is, when the so-called forward limit is reached, the core / acurad forward limit switch 103c Is hit and the advance is stopped in a state where the acurad pin 108 is deeply dipped in the molten aluminum filled in the cavity portion 26.

As it is, the fixed mold 16 and the movable mold 20.
When the cooling water is passed through both molds, the molten aluminum filled in the cavity portion 26 is also cooled as the molds are cooled, and the solidification is completed.

Thereafter, when pressure oil is fed to the hydraulic cylinder 105, the acurad pin 108 retreats and starts rising. When the acurad retract limit limit switch 103b is turned on as it rises as it is, the ascending of the acurad pin 108 is stopped and the ascending is completed.

In order to remove the solidified product of the aluminum melt filled in the cavity 26 and the product, the movable platen 18 is retracted to the retracted limit and the mold opening is completed. Then
When pressure oil is continuously fed to the hydraulic cylinder 105, the coupling 110 is pulled up while being locked to the upper surface of the space of the core 107, and the core 107 moves up and moves backward.

After that, when the pushing plate 90 is pressed, the pushing pin 92 moves forward to push the product attached to the movable die 20 from the cavity portion 26, and the movable die 2
The product is taken out from 0, and the series of operations is completed.

[0036]

As described above, according to the mold clamping device for a molding machine according to the present invention, one movable mold having an acurad cylinder which has a sufficient stroke and a sufficient pressing force and also serves as both a core and an acurad. By arranging it on the upper part of the structure, the structure becomes simple and the maintenance becomes easy.

[Brief description of drawings]

FIG. 1 is a cross-sectional view when both molds of the present invention are released.

FIG. 2 is a cross section when both molds of FIG. 1 are closed.

FIG. 3 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

10 Mold Device 12 Casting Device 14 Fixed Plate 16 Fixed Mold 18 Movable Plate 20 Movable Mold 17 Motor 26 Cavity Part 28 Runner Part 30 Biscuit Part 50 Injection Cylinder 70 Plunger Chip 72 Plunger 74 Tilting Cylinder 100 Core and Accurad Combined Device 103 limit switch 103a core backward limit switch 103b acurad backward limit switch 103c core / acurad forward limit switch 104 piston rod 105 acurad cylinder 107 core 107a convex portion 108 acurad pin 110 coupling

Claims (2)

[Claims] 1. A die cast mold for filling an aluminum molten metal into a cavity formed in a mold space of a movable mold and a fixed mold to obtain an aluminum product, which is provided in the movable mold. A core forming a part of the cavity is vertically movably disposed on the upper side of the cavity, and an acurad cylinder disposed on an outer upper surface of the movable mold, and the acurad cylinder. An acurad pin is fixed to the tip of a piston rod that moves up and down inside through a coupling, and a space surrounding the flange is provided after penetrating the upper and lower parts of the core. A casting mold having an acurad cylinder that also serves as a core, wherein the mold is configured to be movable up and down while being locked to the coupling. 2. The core according to claim 1, wherein a limit switch for detecting the forward and backward limit positions of the core and the acurad pin is arranged on the side surface of the piston rod which moves up and down in the acurad cylinder. Mold for casting with dual-purpose acurad cylinder.