JP2010064121A - Die casting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a die casting system which can obtain a product with a desired special shape by applying pressure to a product directly after the production of a die-cast product and causing plastic deformation. <P>SOLUTION: When the movement of a product grasping arm 7 is completed, a product 400 is grasped in a position facing to dies 5, 6 for plastic working, and, when upper and lower hydraulic cylinders 3 for plastic working are energized to an extruding direction, the dies 5, 6 for plastic working move, and the product 400 is subjected to plastic working. In this state, time has been only passed from 7 to 8 s after the completion of the product 400, high temperature is still retained. Thus, plastic working by the dies 5, 6 for plastic working is sufficiently possible. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a technique for obtaining a product having a desired shape by causing plastic deformation by applying a load to a cast or die-cast product immediately after completion of the product.

Generally, die casting refers to a method of obtaining a product by pouring molten metal such as aluminum into a mold made of sand or the like. Aluminum is about one-third the weight of iron and is widely used in aluminum wheels, beer cans, automobile parts, and the like.
On the other hand, die casting has a very high product dimensional accuracy and is suitable for mass production. Furthermore, since the surface of the product is smooth, it has a feature that it is easy to perform surface treatment such as plating and painting.
In the field of die-casting technology, for example, the technology described in Patent Document 1 can be cited as a technology for obtaining a three-dimensionally curved product.
Moreover, the invention described in Patent Document 2 can be cited as a technique for applying pressure to eliminate voids in the die-cast product.

Japanese Patent No. 2950496 JP 2006-260108 A

In general, the formation of a cylindrical product by die casting is performed by placing a cylindrical core in a cylindrical outer frame, injecting an aluminum solution into the cylindrical mold, forming it, and then pulling out the core after the aluminum has solidified. I went there.
By the way, as shown in FIG. 7, when it is desired to process, for example, the central portion 402 of the cylindrical product 400 into an elliptical shape, the core cannot be pulled out because the major axis of the ellipse is longer than the basic cylindrical diameter. After all, it was extremely difficult to manufacture by die casting.
Die-cast products have a rougher structure than ordinary rolling members and gravity cast products at room temperature, and generally use a low-viscosity alloy to improve castability. The rate was easy to break.
Further, as shown in FIG. 6, when a die-cast product is manufactured, an overflow portion or a runner portion of the product is inevitably generated, and it is a time-consuming work to remove them each time.
Therefore, an object of the present invention is to provide a die cast casting system capable of causing plastic deformation and obtaining a product having a desired special shape by applying pressure to the product at a high temperature immediately after the production of the die cast product. It is.

According to the first aspect of the present invention, in the die-casting system for performing die-cast casting, the die-casting system can be opened and closed in one direction, and is formed by a pair of molds that form an outer shell of the casting and the pair of molds. The pair of molds in conjunction with the core inserted in the space forming the outer shell, the driving means for driving the pair of molds, and the opening of the pair of molds by the driving means. A conveying means for holding the product molded therein and conveying it to a predetermined position; and a plastic working means for applying pressure to the product conveyed to the predetermined position by the conveying means to cause plastic deformation of the product. It is characterized by that.
The invention according to claim 2 is characterized in that, in the invention according to claim 1, the plastic working means includes a blade for cutting off an overflow portion or a runner portion of the product, or both.

  In the first and second aspects of the invention, die casting and plastic working can be performed by a series of processes, and a die cast product having a desired shape can be obtained.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS.
FIG. 1 is a block diagram showing a configuration of a die cast manufacturing system according to the present embodiment. The die cast manufacturing system 500 includes a die cast casting apparatus 100 that performs die casting, and a plastic processing apparatus 200 that immediately applies pressure to the die cast product 400 manufactured by the die cast casting apparatus 100 to plastically deform it. The die-casting apparatus 100 and the plastic working apparatus 200, and the controller 300 that controls them to operate in conjunction with each other are provided.
A feature of the die cast manufacturing system 500 according to the present embodiment is that plasticity is obtained in a transport process (a process of taking out the die cast product 400 from the die cast casting apparatus 100) immediately after manufacturing the die cast product 400 manufactured by the die cast casting apparatus 100. That is, the processing apparatus 200 performs plastic processing. Thus, by performing plastic working immediately after the production of the die-cast product 400, the work originally performed in two stages can be completed in a short time, and the production time of the die-cast product 400 can be shortened.

In this example, a case will be described in which a die-cast product having an elliptical central part in a columnar shape is obtained.
FIG. 2 is a view showing a state in which the product of the die casting apparatus 100 is extruded, that is, an open state.
The die cast casting apparatus 100 includes a movable side 110 and a fixed side 150. The movable side 110 is provided with a movable mother die 112, and the fixed side 150 is provided with a fixed mother die 152. The movable side 110 is slidable in the direction of the arrow in the figure, and when performing die casting, the movable side 110 is moved until it is in full contact with the fixed side 150 (closed state). On the other hand, when taking out the product, the die-cast product is taken out by pulling the movable side 110 away from the fixed side 150. That is, the die-cast casting apparatus 100 is opened and closed by sliding the movable side 110 in the arrow direction with respect to the fixed side 150.
When the movable mold 112 and the fixed side 150 are in a state where the movable side 110 is completely in contact with the fixed side 150 (closed state), they are simultaneously contacted to form a cylindrical outer shell. In addition, in order to form a cylindrical hollow, the slide core A and the slide core B can be inserted into the space formed by the movable mother die 112 and the fixed side 150.
When the die casting apparatus 100 is closed and the slide core A and the slide core B are inserted into the space formed by the movable mother die 112 and the fixed side 150, a high-temperature aluminum solution is discharged from the injection sleeve 180. Is injected and injected.

  After the hot aluminum solution injected from the injection sleeve 180 fills the space formed by the movable matrix 112 and the fixed side 150, it is opened by moving the movable side 110 after 2 to 3 seconds, and is completed. The die-cast product can be taken out. At this time, the die-cast product is solidified but remains at a high temperature.

FIG. 3 to FIG. 5 are diagrams showing an outline of a product take-out mechanism from the die cast casting apparatus 100 provided with a plastic working means (plastic working apparatus 200). 3 is a plan view of a take-out mechanism from the die-casting apparatus 100, FIG. 4 is a side view thereof, and FIG. 5 is a side view from the direction A of FIG. This take-out mechanism enters the die-casting apparatus 100 when the die-casting apparatus 100 is open.
FIG. 6 is a diagram illustrating an example of the die-cast product 400.
In order to simplify the description, the part formed by combining a plurality of members is actually expressed as an integral part, and the hydraulic / pneumatic piping is omitted for the same reason. .

3 to 5, reference numeral 1 denotes a base of the take-out device, one end of which is coupled to the tip head of a SCARA robot (not shown), and is positioned at an arbitrary position in three dimensions, and in an arbitrary attitude in three dimensions. Is controlled by a SCARA robot.
A pair of hydraulic cylinder mounting seats 2 are provided above and below the base 1, and a hydraulic cylinder 3 is mounted on each of them.
Plastic processing dies 5 and 6 are attached to the tip of the spindle 4 of the hydraulic cylinder 3. Further, product runners and overflow cutting blades 19 and 20 are formed on part of the edges of the plastic working dies 5 and 6. As shown in FIG. 6, the die cast product 400 is also formed with a runner portion 404 and an overflow portion 406 at the same time, and these are unnecessary portions, so that they are cut off by the blades 19 and 20.
As described above, the product runner and the overflow cutting blades 19 and 20 are formed at the edges of the plastic working molds 5 and 6, so that the die casting product 400 is plastically processed, or Immediately before, the overflow part 404 or the runner part 406 of the product, or both can be cut off. Therefore, the total manufacturing time and labor of the die-cast product 400 can be reduced.

The product gripping arm 7 is formed in a U-shape, and its central base is attached to the tip of the spindle 9 of the product transfer pneumatic cylinder 8, and the product transfer pneumatic cylinder 8 is attached to the base 1. ing. An intermediate portion 10 of the product gripping arm 7 passes through a hole formed in the base 1 so as to be slidable.
In addition, the product gripping arm 7 forms a product gripping pneumatic cylinder mounting seat 11 at the tip of which the product gripping pneumatic cylinder 12 is mounted.
A gripping shaft 14 is rotatably attached to the tip of the spindle of the product gripping pneumatic cylinder 12 via a joint 13. The joint 13 has a heat insulating property.
The gripping shaft 14 is a means (for example, a key spline or the like) in which the cam follower block 15 rotatably attached to the hole formed in the product gripping arm 7 is not restricted in sliding in the axial direction but only in rotation. ). A cam follower 16 that is rotatably mounted on the cam follower block 15 is engaged with a groove 18 that is narrowed in a cam plate 17 that is implanted in the base 1.
Further, a gripping piece 16 having a shape for easily and surely gripping a product is formed integrally with the gripping shaft 14 at the tip of the gripping shaft 14.

Next, operation | movement of the die-cast manufacturing system which has such a structure is demonstrated.
When the product is pushed out by the extrusion pin immediately after the product casting process is finished by the die casting apparatus 100, the take-out device is positioned by the SCARA robot at a position where the grip piece 26 faces the end face of the product.
Then, the two product holding pneumatic cylinders 12 are simultaneously urged in the pushing direction. Then, the gripping shaft 14 moves in the axial direction (inward), and the gripping piece 26 at the tip abuts on both ends of the product to sandwich the die-cast product 400.
In this state, when the pneumatic cylinder 8 for product transfer is urged in the pushing direction, the product gripping arm 7 moves in a direction in which the product approaches the take-out device while gripping the die-cast product 400.

Then, immediately after the die-cast product 400 is separated from the extrusion pin 20, the SCARA robot enters an operation for separating the take-out device to the outside of the die-cast casting device 100. During the movement of the product gripping arm 7, the runner portion 404 and / or the overflow 406 of the die-cast product 400 are cut and removed by the blades 19 and 20 attached to the plastic working molds 5 and 6.
Further, if the product gripping arm 7 continues to move thereafter, the cam follower 16 is guided downward along the groove 18 of the cam plate 17 and the cam follower block 15 rotates, so the gripping shaft 14 also rotates. At the same time, the die-cast product 400 gripped also rotates, and the predetermined rotation is completed at the end of movement of the product gripping arm 7. The direction and amount of rotation can be arbitrarily set within a range of ± 90 ° by changing the installation position of the cam plate 17 and the shape and dimensions of the groove 18. Further, since the groove 18 is parallel to the moving direction of the product gripping arm 7 until the runner and the overflow are cut, the rotation does not occur.

Thereafter, when the movement of the product gripping arm 7 is completed, the die cast product 400 is gripped at a position facing the plastic working dies 5 and 6. Here, when the upper and lower plastic working hydraulic cylinders 3 are urged in the pushing direction, the plastic working dies 5 and 6 are moved to perform plastic working of the die cast product 400. In this state, since 7 to 8 seconds have elapsed since the completion of the die-cast product 400, only about 10 seconds at the most, the high temperature is still maintained. Therefore, plastic working by the plastic working molds 5 and 6 is sufficiently possible. In this embodiment, the center is formed into an oval shape by pressing it with the same upper and lower forces by means of plastic working dies 5 and 6 from above and below the central part of the cylindrical shape. However, the shape for performing the plastic working is not limited to this, and for example, the central portion of the prismatic shape may be an elliptical shape.
After the plastic working by the plastic working dies 5 and 6 is completed, the plastic working dies 5 and 6 are returned by urging the plastic working hydraulic cylinder 3 in the retracting direction, and the product transfer pneumatic cylinder 8 Is urged in the retracting direction to return the product gripping arm 7.
Then, the product holding pneumatic cylinder 12 is urged in the retracting direction so that the die cast product 400 can be taken out. This completes the die-cast product 400.
As described above, in the die cast manufacturing system 500 according to the present embodiment, these controls are performed by the controller 300, and the die cast casting apparatus 100 and the plastic processing mechanism (plastic processing apparatus 200) are interlocked to manufacture products efficiently. It is supposed to be. As a result, plastic processing can be performed in the conveying process immediately after casting the die-cast product 400, and plastic processing can be efficiently performed at a high temperature immediately after manufacturing.

It is the block diagram which showed the structure of the die-cast production casting system which concerns on a present Example. It is the figure which showed the state which extruded the product of the die-casting apparatus, ie, the open state. It is the figure which showed the outline | summary of the taking-out mechanism of the product of the die-casting apparatus provided with the plastic working means, and is the top view. It is the figure which showed the outline | summary of the product taking-out mechanism of the die-casting apparatus provided with the plastic working means, and is the side view. It is the figure which showed the outline | summary of the taking-out mechanism of the product of the die-casting apparatus provided with the plastic working means, and is an A direction side view. It is the figure which showed the state of the product. It is the figure which showed the example of the product in which the center part became elliptical shape.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 5, 6 Die for plastic working 19 blade 20 blade 100 Die-casting apparatus 110 Movable side 112 Movable mother die 150 Fixed side 152 Fixed mother die 180 Injection sleeve

Claims (2)

In the die cast casting system that performs die casting,
A pair of molds that can be opened and closed in one direction and that forms the outer shell of the casting;
A core inserted into a space formed by the outer shell formed by the pair of molds;
Driving means for driving the pair of molds;
In conjunction with the opening operation of the pair of molds by the driving unit, a transport unit that holds the product molded in the pair of molds and transports the product to a predetermined position;
A die-casting system, comprising: plastic working means that applies pressure to the product conveyed to a predetermined position by the conveying means to cause plastic deformation of the product.   2. The die cast casting system according to claim 1, wherein the plastic working means includes a blade for cutting off an overflow portion or a runner portion of the product, or both.

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