JPH0120946B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to an automatic die-casting device for cutting the remainder of a die-casting product, particularly an apparatus for automatically cutting the remainder of a die-casting product, which is integrally formed with a product in die-casting molding of a metal material such as zinc alloy or aluminum or a plastic material to form a product into a desired shape. This invention relates to an automatic die-cast residue cutting device that automatically cuts the gate and sump inlet connected to the remaining product.

[Prior art]

Die-casting equipment is well known, which forms a product with a desired shape by pouring molten metal into a mold formed by a stationary mold plate and a movable mold plate, and can easily mold products with complex shapes. Because you can
It is used in various industrial fields.

By the way, in conventional die-casting equipment, products that are formed by pouring molten metal into a product mold have the remaining spool and sump integrally formed, so it takes a long time to separate the remaining part from the product. In addition to the method of manually cutting off the remaining part from the product after casting, a method has recently been used in which the remaining part is automatically separated by slide shearing. This method requires a separation process and has the disadvantage that the product is easily damaged if it is accidentally dropped.

In addition, the latter method requires a sliding mechanism, which has the disadvantage that the overall structure of the mold becomes complicated and burrs are generated due to wear of the sliding surface.

Furthermore, conventional die-casting apparatuses have the disadvantage that even after the gate is separated from the product, the gate remains, resulting in a poor appearance of the product.

[Summary of the invention]

The present invention was made in view of the above-mentioned conventional problems, and its purpose is to eliminate the step of manually separating the remaining part of the product after the ejecting process, thereby eliminating damage caused by falling products and reducing costs. At the same time, we do not use parts that slide on the mold surface such as slide shear rings, and the remaining part is automatically cut using only the core pin so that a hole is formed at the connection position with the rest of the product. An object of the present invention is to provide an automatic die-casting residual part cutting device that can improve quality and product appearance by eliminating the occurrence of gate residues and gate residues.

In order to achieve the above object, the present invention provides a product mold section formed by a fixed side mold plate and a movable side mold plate.
In a die-casting machine in which a product is formed into a desired shape by pouring molten metal, and a casting remainder is integrally formed with the product, a spool or a sump is passed through the product mold section before filling the molten metal. In order to form a hole in the product, a core pin having approximately the same diameter as the hole is provided over almost the entire length, and the core pin is provided with a residual extrusion formed near the open end of the hole and for separating the remaining portion. The remaining extrusion shoulder is formed into a tapered shape that has a minimum diameter at a position facing the gate or sump inlet and gradually increases in diameter from this position in the vertical direction, and is used to eject the product from the mold. The mold opening mechanism is characterized in that the mold opening mechanism moves the core pin in a direction from the hole of the product toward the remaining portion to automatically cut the remaining portion that is integrated with the product before the product is ejected.

[Embodiments of the invention]

Preferred embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a cross-sectional view showing one embodiment of a preferred die casting apparatus for automatically cutting the remaining portion of die casting according to the present invention, and FIGS. 2 to 5 are each step of mold opening in the die shown in FIG. 1. FIG. 6 is an enlarged sectional view showing the main part of the core pin in FIG. 1, and FIG. 7 is an enlarged sectional view showing the main part of the core pin in FIG. 2.

In FIG. 1, the mold of this embodiment includes a stripper plate 10, a fixed side mold plate 12, and a movable side mold plate 14.
A fixed side mounting plate 16 is provided on the upper surface of the stripper plate 10, and the stripper plate 10, the fixed side template 12, and the movable side template 14 are connected to each other.
is the guide pin 18 fixed to the fixed side mounting plate 16.
will be guided to.

The movable mold plate 14 is fixed to the movable mounting plate 20 via a spacer block 22 and a holding plate 24 by fixing screws (not shown).

Inside the fixed mold plate 12 and the movable mold plate 14, there is a product mold part 26 having the shape of a desired watch gear.
is formed, and the fixed side mounting plate 16 has a nozzle 28 whose tip reaches the lower surface of the stripper plate 10.
is provided on the stationary side mold plate 12, and the nozzle 28 is provided on the fixed side mold plate 12.
A runner 30 and a spool 32, which are flow paths for supplying molten metal injected from the product mold section 26 into the product mold section 26, and a sump 34 for discharging air inside the product mold section 26 to the outside are formed. ing.

A spring 36 is attached to the fixed side mounting plate 16 with bolts, and the fixed side mold plate 12 is pressed downward by this spring 36.

On the right side in FIG. 1, a restriction bolt 38 whose head 38a is located within the movable mold part 14, passes through the fixed mold plate 12 and the stripper plate 10, and is fixed to the fixed mounting plate 16; One end has a locking part 40a that engages with a stepped part in the stripper plate 10 and is locked with the head 38a of the limit bolt 38, and the other end engages with the lower surface of the stationary template 12. A mold opening order regulating device 42 is provided, which includes a puller bolt 40 having a locking portion 40b.

Further, in order to eject the product 27 held by the movable mold plate 14 from the movable mold plate 14 in the ejecting process, the following ejecting device is provided.

That is, the ejector pin 44 and the guide pin 46 are fitted into the presser plate 24 and the movable template 14, and the ejector pin 44 and the guide pin 4
The head of 6 has two ejector plates 48,5
Fixed to 0.

In the mold opening process, the ejecting action of the product is performed by a well-known hydraulic extrusion device, and the ejector rod 52, one end of which is fixed to the ejector plate 50, is driven upward by this hydraulic extrusion device. When the ejector pin 44 is moved upward via the ejector plate 50, the product 2 held on the movable mold plate 14 is removed.
Highlight 7.

Two core pins 54 and 56 that form holes in the product are fixed to the fixed side mounting plate 16 before filling the product with molten metal, and one core pin 54 passes through the stripper plate 10 to connect the runner 30 and the spool 32 and through the gate 58 to the product mold section 26
The tip of the core pin 54 passes through the inside of the movable template 1.
Distraction within 4. The other core pin 56 passes through the stripper plate 10, passes through the trough 34, and penetrates the product mold part 26, and the core pin 56
6 extends into the movable mold plate 14.

As shown in FIG. 6, the core pins 54 and 56 are formed to have the same inner diameter as the gate 58 except for the vicinity of the gate 58, and have the smallest diameter at the position facing the gate 58, and from that position in the vertical direction. It is formed in a tapered shape so that the diameter gradually increases toward the end, so that the molten metal flows from the spool 32 into the product mold section 26. Furthermore, the core pins 54, 56 are formed with residual extrusion shoulders 54b, 56b near the opening ends of the holes formed in the product. That is, the lower tapered surface of the core pin 54 corresponding to the gate 58 connects the gate 59 to the remaining product integrated with the product 27 when the core pin 54 moves upward during mold opening, which will be described later, to the peripheral edge 54a. A remainder extrusion shoulder portion 54b is formed for cutting the spool 33 and pushing out the remaining spool 33 upward together with the core pin 54.

The other core pins 56 are connected to the product mold part 26 and the trough 34.
The shaft hole is formed to be equal to the diameter of the shaft hole formed in the watch gear (product 27), except for the vicinity of the sump inlet 60, which is the boundary between the It is formed in a tapered shape so that the diameter gradually increases in the direction.

The lower tapered surface of the core pin 56 corresponding to the sump inlet 60 is a sump inlet that is connected to the remaining product 27 that is integrated with the product when the core pin 56 moves upward during mold opening to be described later. 61 is cut at the peripheral edge 56a to separate the tundish 35 and to extrude the tundish 35 upward together with the core pin 56, thereby forming a remaining extrusion shoulder 56b.

A preferred embodiment of the automatic die-cast remainder cutting device according to the present invention has the above-mentioned configuration, and the operation of each process by this device will be explained below.

The molten metal injected from the nozzle 28 in the mold clamped state shown in FIG. The molten metal escapes from the sump inlet 60 and enters the sump 34, and the nozzle 28, runner 30, spool 32, gate 58, product mold section 26, and sump 34 are filled with molten metal.

Next, after the molten metal supplied into the mold is cooled in the cooling process, the process moves to the mold opening process, but as shown in FIG. When the fixed side mounting plate 16 and the stripper plate 10 are driven in this direction, the fixed side mounting plate 16 and the stripper plate 10 are first separated by the return force of the spring 36. As a result, the nozzle 29 and the runner 31 are disconnected, and the seventh
As shown in the figure, the fixed side template 12 and the movable side template 14 move in the direction of arrow A with respect to the core pins 54 and 56, but at this time, the peripheral edge 54a formed on the remaining extruded shoulder portion 54b of the core pin 54 gate 5
The gate 59 that is integrated with the product by sliding on the inner wall of the product 2 is cut, and the remaining spool 33 is attached to the product 2.
When the core pin 54 is separated from the product 27 and the tip of the core pin 54 below the extruded shoulder portion 54b of the core pin 54 comes out of the product 27, a gate hole is formed in the product.

In the other core pin 56, the peripheral edge 56a of the remaining extruded shoulder portion 56b of this pin 56 slides on the inner wall of the sump inlet 60 and is integrated with the product 27.
5 at the sump inlet 61 and the remaining sump 3
5 is separated from the product 27.

When the drive section including the movable mounting plate 20 further moves in the direction of arrow A, the stripper plate 10 and the stationary mold plate 12 are completely opened as shown in FIG. The reservoir 35 is removed from the stationary template 12 while being supported by the core pins 54 and 56.

When the drive section including the movable mounting plate 20 further moves in the direction of arrow A, the stripper plate 10 lowers to a position where it abuts the head 38a of the restriction bolt 38, as shown in FIG.
Since the core pins 54 and 56 are completely pulled out, the runner 31, spool 33, and sump 35 are removed from the stripper plate 10.

When the drive unit including the movable mounting plate 20 further moves in the direction of arrow A, the fixed mold plate 12 and the movable mold plate 14 are separated as shown in FIG. When 52 is moved, the guide pin 4 is moved through the ejector plate 50.
6, the ejector pin 44 rises, and the product 27 held on the movable mold plate 14 is released from the movable mold plate 14.

In this way, in the present invention, the spool 33 and the sump 35, which are the remaining parts that are integrated with the product 27, are automatically separated at the gate 59 and the sump inlet 61, respectively, in the mold opening process, so that the ejection process is performed automatically. A subsequent separation process can be eliminated, and manufacturing costs can be reduced.

In addition, in the present invention, a conventional slide shear that slides on the mold surface is used to automatically cut off the gate 59 and the sump inlet 61 connected to the remaining product 27 that are integrated with the product 27. This is done using only the core pin 54 without using parts such as rings, and the tip of the core pin 54 is arranged so as to penetrate the product mold part 26 from inside the gate 58, thereby preventing the occurrence of cast burrs and the gate. By eliminating the remaining residue, it is possible to improve quality and product appearance.

Incidentally, as shown in this embodiment, the core pin 5 is attached to the pin that forms the shaft hole of the product 27, which is a clock gear.
A core pin 56 that has the same effect as 4 is used, making it possible to provide a sump in gear products, which was previously impossible, and thereby preventing air from getting mixed into the product. This can be prevented and high-precision casting can be achieved.

〔Effect of the invention〕

As explained above, according to the present invention, the core pin having the remaining extrusion shoulder is slid on the inner wall of the gate and the inner wall of the sump inlet using the stroke of the mold when the mold is opened, and is connected to the remaining product. By automatically cutting off the gate and sump inlet and drilling a hole in the connection with the rest of the product, the product is free of flash and gate residue when it is ejected from the mold. The remainder is now in a cut state, thereby eliminating the conventional manual procedure of cutting the remainder. In addition, it can be made smaller than conventional automatic cutting using slide shearing, has a simple structure, and can improve product quality.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a preferred die casting apparatus for automatically cutting the remaining portion of die casting according to the present invention, and FIGS. 2 to 5 are each step of mold opening in the die shown in FIG. 1. FIG. 6 is an enlarged sectional view showing the main part of the core pin in FIG. 1, and FIG. 7 is an enlarged sectional view showing the main part of the core pin in FIG. 2. 10... Stripper plate, 12... Fixed side template, 14... Movable side template, 26... Product mold part, 27
...Product, 30...Runner, 32...Spool, 33...
Spool (remainder), 34...pool, 35...pool (remainder), 54...core pin, 54a...periphery, 54b...
Remaining extrusion shoulder, 58...gate, 59...gate (remaining part), 60...sump inlet, 61...sump inlet (remaining part).

Claims (1)

[Claims] 1. A product is formed into a desired shape by pouring molten metal into a product mold section formed by a fixed mold plate and a movable mold plate, and a spool or a sump is connected to its gate or sump inlet. In a die-casting device in which the product is formed to have a minimum inner diameter and the spool or sump is integrally formed with the product as a casting remainder, the spool or sump is installed to penetrate the product mold part through the spool or sump before filling with molten metal. , in order to form a hole in the product, a core pin having substantially the same diameter as the hole is provided over almost the entire length, and the core pin has a residual extrusion shoulder formed near the open end of the hole for separating the residual portion. This remaining extrusion shoulder is formed into a tapered shape that has a minimum diameter at a position facing the gate or sump inlet and gradually increases in diameter from this position in the vertical direction, and has a protrusion for ejecting the product from the mold. An apparatus for automatically cutting the remainder of a die casting, comprising a mold opening mechanism that automatically cuts the remainder integrated with the product by first moving the core pin in a direction from the hole of the product toward the remainder.