JPH034431Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a core drawing device for a die-casting machine.

Conventionally, a core extraction device in a die-casting machine has been unable to extract the core from the cavity until after the movable mold and the fixed mold have been opened.

However, since the above structure is a core stopper structure in which the core is held and held (locked) in the cavity by clamping the movable mold and the fixed mold, the cast product will not stretch when the core is pulled out. This causes deformation such as twisting and twisting, which deteriorates the quality of the cast product.
In other words, since the cast product after the mold is opened is only held down by the cavity surface of the movable mold, the part of the casting device formed on the cavity surface side of the fixed mold is pulled and stretched when the core is pulled out. There is a risk of deformation such as twisting.

Therefore, the present invention provides a core pulling device equipped with a stopper device that can pull out the core while the movable mold and the fixed mold are clamped, thereby improving the quality of cast products. The purpose is to shorten the casting cycle.

The basic structure of the core extraction device of the present invention is that a movable block for mounting and supporting the core is inserted into a sliding groove provided in both the movable and fixed molds so as to be able to move up and down. The block is linked to a core cylinder installed on the axis of the block in the protruding and retracting direction, and a stopper device is installed perpendicular to the axis of the block in the protruding and retracting direction. The stopper pin is installed in a perpendicular shape and is retractable and protrudes from the upper surface of a movable block into which the tip is recessed, and a stopper operating mechanism is installed in conjunction with the rear end of the stopper pin and slides the stopper pin. Therefore, the movable block that supports the core can be locked or unlocked from the outside by the sliding movement of the stopper pin, regardless of the mold clamping between the movable mold and the fixed mold, and the mold opening operation. It is characterized by what it did.

An example of the implementation of the present invention will be described based on the drawings. In the figure, A is a die-casting machine, and this casting machine A includes a movable mold 1, a fixed mold 2, a movable platen 3, a fixed platen 4, and various mechanical members. A core 7 is placed in a pair of sliding grooves 6 formed in the mold mating surfaces 5 of the movable mold 1 and the fixed mold 2, respectively. Movable block 8 that can be mounted and supported
It is inserted and installed so that it can move up and down.

This movable block 8 has a connecting boss 8a provided at the center of its upper end surface, and connects it to the lower end of a rod 10a of a core cylinder 10, which is installed upright on the outer upper surface of the movable mold 1 via a bracket 9 on the axis line in its protruding and retracting direction. It is linked via a coupling ring 11, and moves up and down with the operation of the core cylinder 10 to move the core 7.
The core 7 is supported so that the core 7 is inserted into the cavity 12 of both molds 1 and 2, or the core 7 is pulled out from the cavity 12.

In addition, this movable block 8 has a stopper device B attached and installed in a state where the core 7 is inserted into the cavity 12, that is, when it is recessed in the sliding groove 6, in a manner that intersects with the axis of the movable block 8 in its projecting and retracting direction.
The upper end surface is held (locked) by the presser foot.

Furthermore, when the movable block 8 is retracted, the block 8
The upper end surface of the molds 1 and 2 is flush with the outer upper surface of both molds 1 and 2, and the presser foot is held (locked) by the stopper device B.
Wait for the status.

The stopper device B holds and holds the core 7 inserted into the cavity 12 from the outside via a movable block 8 so that it does not move in the withdrawal direction due to back pressure (injection pressure) generated during injection and filling of the molten metal. A stopper pin 20 that slides freely in and out and has its tip abutted against the upper end surface of the movable block 8, and this stopper pin 20
It consists of a stopper operating mechanism consisting of a conversion block 21 that slides and a stopper cylinder 22.

The stopper pin 20 is a metal rod having an angular outer shape, and has a stepped portion in the center portion thereof in the longitudinal direction, so that the width in the tip direction is slightly thinner than the width in the rear end direction. The distal end of the movable mold 1 is inserted into the guide cylinder 23 which is attached to the upper outer surface of the movable mold 1 so that the distal end can freely protrude and retract. The movable block 8 is recessed into the same plane as the outer upper surface of the movable mold 1 and the fixed mold 2, and is slidably movable in the horizontal direction so as to protrude while being in sliding contact with the upper end surface of the movable block 8. protrude to the outside from the back of the

Engagement flanges 20a extending in an inclined manner are formed protruding in opposite directions on both sides of the rear end of the stopper pin 20, and the engagement flanges 20a are fitted into the conversion block 21 so as to be vertically slidable. It is used to connect with.

The conversion block 21 converts the vertical operating motion of the cylinder 22, which is vertically installed on a stand 24 horizontally installed between both side legs of the bracket 9, into the horizontal sliding motion of the stopper pin 20. In addition, the stopper pin 20 and the cylinder 22 are connected to each other in a perpendicular state, and a guide groove 21a is formed in a vertically elongated metal block having a substantially square planar shape.

This guide groove 21a connects the stopper pin 20 to the conversion block 21 by fitting and locking the engagement flange 20a of the stopper pin 20 and the rear end portion near the flange 20a so that the stopper pin 20 can slide vertically, and also prevents the vertical movement of the conversion block 21. This functions to move the stopper pin 20 to slide in the horizontal direction, and extends in an inclined manner from the top surface to the bottom surface of the conversion block 21, and has a substantially T-shaped planar shape toward the periphery and side surface of the conversion block 21. It is formed with a recess.

Further, a screw hole 21b is formed in the center of the upper surface of the conversion block 21, and a screw hole 21b is formed in the center of the upper surface of the conversion block 21, and a rod 22a of the cylinder 22
The conversion block 21 and the cylinder 22 are connected to each other by being attached and suspended by bolts 27 to a connecting plate 26 which is horizontally connected and fixed at the lower end via a coupling ring 25. Reference numeral 28 denotes an installation tool for installing the conversion block 21 on the upper end of the back surface of the movable mold 1 so that it can slide vertically. Board 28
A fitting hole 28b for fitting and installing the conversion block 21 is formed in the same shape as the outer circumferential shape of the conversion block 21 behind the conversion block 21.

Also, a stopper pin 2 is located on the axis of the guide tube 23 on the base plate 28a of the installation tool 28.
A through hole 28a' is formed through which the rear end of the stopper pin 20 can slide freely, and the stopper pin 20 can be reliably slid in the horizontal direction through this through hole 28a'.

Therefore, the stopper device B for the core 7 in the core drawing device of the present invention converts the operation of the cylinder 22 that operates in the vertical direction into the horizontal operation of the stopper pin 20 installed to slide in the horizontal direction. The die-casting machine A is installed in a narrow space behind the movable mold 1 so as not to interfere with the operation of various mechanical members, electrical equipment, etc. installed in the die-casting machine A. That is, the movable mold 1 and the extrusion plate (shown in the figure) that supports the extrusion pin that is movable when taking out the cast product after opening the mold are installed behind the movable mold 1 with a desired spacing. The stopper device B is constructed so that it can be installed by effectively utilizing the upper part of the gap formed between it and the movable platen 2 (FIG. 2).

Next, to explain the operation of the core drawing device of the present invention, when the mold matching (mold clamping) between the movable mold 1 and the fixed mold 2 is completed, the core cylinder 10 is activated and the movable block 8 is slid. The core 7 is fitted into the groove 6 and inserted into the cavity 12. At this time, the upper end surface of the movable block 8 is
It becomes the same plane as the outer upper surface of 2. Then, the cylinder 22 starts operating and moves the conversion block 21 downward into the insertion hole 28b of the installation tool 28. Then, as the conversion block 21 moves downward, the stopper pin 20 is guided and slid in the forward direction by the guide groove 20a, causing the tip to protrude from the guide tube 23 and the outer periphery to be attached to the movable block 8.
The movable block 8 is held in place (locked) by being abutted against the upper end surface of the movable block 8.

Then, when the injection filling of the molten metal is completed and the molten metal in the cavity 12 solidifies, and the cast product is taken out, the cylinder 22 is operated and the conversion block 2
1 is moved upward while the stopper pin 20 is slid in the backward direction. At this time, the cylinder 22 is operated so as to slide the stopper pin 20 until its tip is recessed into the guide cylinder 23.

After that, the core cylinder 10 starts operating and pulls out the core 7 from inside the cavity 12 (fifth
), the mold opening begins.

Incidentally, after the holding (locked) state of the presser foot by the stopper device B is released, the mold opening may be started after the core 7 is completely pulled out.
The drawing start and the mold opening start may be performed at the same time, and these can be arbitrarily set by electrical control.

In addition, in the above embodiment, the stopper pin 20
In order to operate the cylinder 22, the operating direction (vertical direction) is changed to the operating direction (horizontal direction) of the stopper pin 20. Any stopper actuating mechanism that can slide in a horizontal direction perpendicular to the axis of the stopper pin 20 may be used.For example, a cylinder may be directly mounted on the back surface of the movable mold 1 located on the axis of the stopper pin 20. Alternatively, the stopper pin 20 may be slid in the horizontal direction.

As mentioned above, the present invention is designed to attach and support the core, making it movable.
The upper surface of the movable block to be inserted into the sliding groove (with the core inserted into the cavity) formed in the mold matching surfaces of both fixed molds is crossed with the axis of the movable block in the protruding and retracting direction. The movable block is held from the outside by the sliding movement of the stopper pin of the stopper device installed in the shape of the stopper device, and the protruding locking of the tip of the pin allows the movable block to be clamped between the movable mold and the fixed mold, regardless of the mold opening operation. Since it is possible to lock and release the lock, the core can be pulled out with both molds clamped.

Therefore, it is possible to reliably prevent a part of the cast product from being deformed, such as elongation or twisting, when the core is pulled out, as in the past, and the quality of the cast product can be improved.

Furthermore, since the core pulling operation and the mold opening operation can be performed simultaneously, the casting cycle can be shortened compared to the conventional casting cycle in which the mold opening operation and the core pulling operation are performed separately.

Thus, the intended purpose can be achieved.

[Brief explanation of drawings]

The drawings show an example of the implementation of the present invention, FIG. 1 is a front view with some parts omitted, FIG. 2 is a longitudinal sectional front view showing the main parts enlarged, and FIG. 3 is a view taken along the - line in FIG. 4 is an enlarged sectional view taken along the - line in FIG. 2, FIG. 5 is an enlarged front view of the main parts showing the movable (operating) state of the device for pulling out the core of the present invention, and FIG. FIG. 2 is a partially exploded perspective view of a stopper device provided in the child extraction device. In the figure, A...die-casting machine, B...stopper device, 1...movable mold, 2...fixed mold, 6...
...Sliding groove, 7... Core, 8... Movable bracket lock, 10... Cylinder for core, 20... Stopper pin, 21... Conversion block (stopper operating mechanism), 22... Cylinder (stopper operating mechanism) ), 28... Installation tool (operating mechanism).

Claims (1)

[Scope of utility model registration request] A movable block for mounting and supporting the core is fitted into a sliding groove provided in both the movable and fixed molds so that it can move up and down, and this movable block is installed on the axis of the block in the direction of extension and retraction. A stopper device is installed perpendicularly to the axis of the projecting and retracting direction, and the stopper device is installed perpendicular to the axis of the projecting and retracting direction and is installed so as to be freely retractable and movable so that its tip can be retracted. A core drawing device for a die-casting machine, comprising a stopper pin that protrudes from the upper surface of a block and a stopper operating mechanism that is installed in conjunction with the rear end of the stopper pin and slides the stopper pin.