JPH105967A - Die device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute advancing/retreating movement of a pull-out and a local part pressing pin with only one driving cylinder and with a simple mechanism, by arranging the local part pressing pin and a hooking arm in the pull-out core. SOLUTION: At the time of clamping a die, the cylinder 7 for driving is worked to advance the rod 7a. The pull-out core 3 is set to a prescribed position in the die. Successively, the cylinder 7 for driving is worked to retreat the rod 7a. The tip part 4a of the local part pressing pin 4 is inserted into a pin setting hole 8 of the pull-out core 3 and then, molten metal (m) is supplied and filled into a cavity 5 in the die under this condition. Just before solidifying the molten metal (m), the local part pressing pin 4 is shifted in the advancing direction by working the cylinder 7 for driving and pressed onto the molten metal (m) to load the pressure. The molten metal (m) is perfectly solidified to cast a product and thereafter, the die opening is executed and simultaneously, the cylinder 7 for driving is worked to retreat the rod 7a. The pull-out core 3 is shifted in the retreating direction by pulling with the hooking arm 10 abutted on a coupling 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold apparatus used for die casting and the like, and more particularly, to a mold apparatus having a drawing core.

[0002]

2. Description of the Related Art After a molten metal is supplied and filled in a mold cavity, a local pressure pin is pushed in to compensate for the solidification shrinkage of the molten metal to apply pressure to the molten metal in the cavity. Conventionally, when the method is carried out in a mold apparatus having a drawing core, two independent driving cylinders are required to move the drawing core and the local pressure pin forward and backward. And had For this reason, the size of the mold apparatus is increased, and problems such as being restricted by the installation space and causing interference with peripheral devices are likely to occur.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem, and has been made in consideration of the drawback core and the local pressurizing pin using only one driving cylinder and a simple mechanism. It is an object of the present invention to provide a mold device capable of performing an advancing / retreating operation and having no increase in size as compared with a mold device having a normal drawing core.

[0004]

According to the present invention, there is provided a mold apparatus in which a local pressurizing pin is slidably mounted on a drawing core, and a tip end of the local pressurizing pin is attached to the drawing pressurizing core. In addition to being able to be retracted into and out of the mold cavity, the rear end of the local pressure pin is connected via a coupling to a driving cylinder for moving the drawing core forward and backward, and the drawing core has The present invention is characterized in that a locking arm with which the coupling abuts when the local pressure pin is retracted is installed.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. In the figure, 1 is a fixed type, 2 is a movable type, 3 is a drawing core, and 4 is a local pressure pin.

[0006] As in the prior art, the drawing core 3 is a fixed mold 1
In order to form the mold cavity 5 in cooperation with the movable mold 2, the mold (the fixed mold 1 or the movable mold 2) moves forward and backward in accordance with the opening and closing operation of the molds (the fixed mold 1 and the movable mold 2). Assembled. In the illustrated embodiment, the movable die 2 is installed so as to be able to move forward and backward, and is assembled so as to move forward and backward by a driving cylinder 7 attached to the movable die 2 via a bracket 6 like the extraction core 3. Have been.

[0007] In the drawing, reference numeral 3a denotes a stopper for restricting the drawing core 3 from moving when the molten metal m is injected and filled into the mold cavity 5, and includes a mold (a fixed mold 1, a movable mold 1). When the mold is closed in 2), it is tightly fitted into the positioning recess 1a formed on the mold (fixed mold 1 in the embodiment).

A pin mounting hole 8 is formed in the drawing core 3 so as to penetrate the mold cavity 5 from the back side, and the local pressure pin 4 is penetrated into the pin mounting hole 8 along the axial direction. Install slidably.

The local pressure pin 4 is used to apply pressure by pushing the molten metal m into the mold cavity 5 by pushing it into the molten metal m so as to compensate for the solidification shrinkage of the molten metal m. Slidably penetratingly installed in a pin installation hole 8 formed in the mold cavity 5
And the rear end 4b is pulled out.
Of the drive cylinder 7 (for moving the rod 7
a) is connected via a coupling 9.

The drawing core 3 has a local pressing pin 4
When the arm is retracted, the hook arm 10 with which the coupling 9 comes into contact is installed. The locking arm 10 restricts the retreat limit of the local pressure pin 4 and at the same time abuts the coupling 9 when the pulling-out core 3 is retreated with respect to the dies (fixed mold 1 and movable mold 2). The engaging portion 10a is integrally protruded from the rear surface of the core 3 toward the coupling 9.

At this time, the protruding height of the latch arm 10, that is, the distance (L) between the latch portion 10a and the contact surface 9a of the coupling 9 is set back from the forward limit position of the local pressure pin 4. It is set to be the same as the distance to the limit position.

Next, the operation of the mold apparatus will be described with reference to FIG. (A) When the molds (the fixed mold 1 and the movable mold 2) are closed, the drive cylinder 7 is operated to move the rod 7a forward. Then, the coupling 9 connected to the rod 7a of the driving cylinder 7 abuts on the back side of the drawing core 3, pushes the drawing core 3 forward, and moves forward and stops at a predetermined position.

(B) Then, when the molds (the fixed mold 1 and the movable mold 2) are completely closed, the stopper 3a of the drawing core 3 is completed.
Is tightly fitted into the positioning recess 1a formed on the side of the mold (fixed mold 1 in the embodiment), and the drawing core 3 is set at a predetermined position of the mold (fixed mold 1 and movable mold 2). Is done.

(C) Next, the driving cylinder 7 is operated to retract the rod 7a. Then, the local pressure pin 4 connected to the rod 7a of the driving cylinder 7 via the coupling 9 moves backward, and the contact surface 9 of the coupling 9
When “a” comes into contact with the hook portion 10 a of the hook arm 10, the operation of the driving cylinder 7 is stopped. Then, the local pressure pin 4
Stops at the retreat limit position, and the distal end portion 4a of the local pressure pin 4 enters the pin installation hole 8 of the extraction core 3 to enter a standby state in which the local pressure is applied.

(D) In this state, the molten metal m is supplied and filled into the mold cavity 5. Immediately before the molten metal m filled in the mold cavity 5 solidifies, the driving cylinder 7 is operated to cause the local pressing pin 4 to move forward, and as shown in FIG. Is pressed into the molten metal m of the mold cavity 5 to apply pressure.
Note that a timer or the like is used to set the timing at which the local pressure pin 4 is moved forward.

However, after the molten metal m filled in the mold cavity 5 is completely solidified and the product is cast, the molds (the fixed mold 1 and the movable mold 2) are opened, and at the same time, the drive By operating the cylinder 7, the rod 7a is retracted.
Then, the local pressure pin 4 connected to the driving cylinder 7 via the coupling 9 is retracted and pulled out of the cast product, and the contact surface 9a of the coupling 9 is engaged with the engaging portion of the engaging arm 10. Since it comes into contact with the rod 10a, the driving cylinder 7 is further operated and the rod 7a is retracted.
Then, the drawing core 3 is pulled back by the latching arm 10 in contact with the coupling 9 and retreats, so that the drawing core 3 is separated from the cast product in the mold cavity 5. Thereafter, the cast product is extruded from the mold cavity 5 and demolded.

[0017]

As described above, the mold apparatus of the present invention can move the drawing core and the local pressure pin forward and backward using only one driving cylinder and a simple mechanism. . Therefore, the size of the mold device is not increased as compared with a mold device having a normal drawing core, and there is no danger of installation space restrictions or interference with peripheral devices.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing one embodiment of the present invention.

FIG. 2 is a schematic diagram illustrating the order of operation.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fixed type 2 ... Movable type 3 ... Pulling-out core 4 ... Local pressurizing pin 5 ... Mold cavity 7 ... Driving cylinder 9 ... Coupling 10 ... Hanging arm

Claims (1)

[Claims] 1. A mold device comprising a drawing core, wherein a local pressing pin is slidably mounted on the drawing core, and a tip of the local pressing pin is set in a die. The local end of the local pressure pin is connected to a drive cylinder for moving the drawing core forward and backward through a coupling, and the local end of the local pressing pin is connected to the drawing core. A mold device comprising a hook arm with which the coupling abuts when the pressure pin is retracted.