JP4723539B2 - Second material removal method and apparatus - Google Patents

Description

  The present invention relates to a method and an apparatus for removing unnecessary portions (hereinafter referred to as “second material”) such as a sprue portion and an overflow portion formed on an outer peripheral portion of a cast product such as aluminum die casting.

  In the production process of a cast product such as aluminum die casting, it is necessary to remove the second material formed on the outer periphery of the cast product after casting. As this removal method, for example, a trimming press as shown in Patent Document 1 is well known. In this trimming press, the upper die is lowered while the cast product is positioned on the lower die set in the press machine, so that the cast product is punched between the upper die and the lower die, and the second material is sheared and removed. Is. In addition to the trimming press, the second material is also beaten with a picker that reciprocates in the vertical direction.

JP 2006-136891 A

In the above trimming press, the mold is larger than the cast product, and the weight is excessive. Therefore, the apparatus becomes large and expensive, and maintenance is troublesome. In particular, it is necessary to prepare different molds for each shape of the cast product, which is costly and time-consuming and time-consuming for setup change.
In addition, pickers can be cheaper than trimming presses and have the advantage of easy setup change, but vibration and noise are generated when the second material is struck and cracked into the cast product due to impact. There was a risk of causing damage.

  Accordingly, the present invention provides a method and apparatus for removing a second material that is simple and low-cost, that can be easily maintained and replaced, and that does not generate vibration or noise and that is less likely to damage a cast product. It is intended to do.

In order to achieve the above object, the invention described in claim 1 is a method of removing the second material formed on the outer peripheral portion of the casting using a pressing body that reciprocates, and fixing the casting. In the state, the pressing body is moved forward with respect to the second material, the pressing body is temporarily stopped at the position where the tip of the pressing body contacts the second material, and then the pressing body is moved forward again from the second material. This is characterized in that it is folded.
In order to achieve the above-mentioned object, the invention according to claim 2 includes a holding means capable of holding a cast product having a second material formed on the outer peripheral portion in a predetermined posture, and a cast product held by the holding means. A second material removing apparatus comprising a pressing body capable of reciprocating with respect to the second material and a control means for controlling the reciprocating motion of the pressing body, wherein the control means fixes the cast product by the holding means. In this state, the pressing body is moved forward with respect to the second material, the pressing body is temporarily stopped at the position where the tip of the pressing body abuts on the second material, and then the pressing body is moved forward again from there. The pressing body is operated so as to break the material.
In addition to the object of claim 2, the invention described in claim 3 is a multi-joint equipped with a holding means and a hand portion for gripping the cast product at the tip in order to quickly move and deliver the cast product. It is characterized by being a robot.

According to the first and second aspects of the present invention, a mold for removing the second material is not required, and the second material can be removed with a simple configuration. Easy to do. Further, since the pressing member is once brought into contact with the second material and then broken, vibration and noise are not generated, and damage such as cracking is hardly generated in the cast product, so that improvement in quality can be expected.
According to the third aspect of the invention, in addition to the effect of the second aspect, by adopting an articulated robot as the holding means, not only the movement of the cast product associated with the removal of the second material, but also from the previous step. The casting can be received and delivered to the subsequent process quickly in a short time, which can contribute to the improvement of production efficiency.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing an example of a second material removing device, FIG. 2 is a side view thereof, FIG. 3 is a plan view, and the second material removing device 1 is one of the upper surfaces of a square frame-shaped base 2. A pair of support columns 3 and 3 are erected at the opposite end positions of the support bar 4, a support bar 4 is installed between the upper ends of the support columns 3 and 3, and a pressing rod 5 as a pressing body is provided at the approximate center of the support bar 4. And a control mechanism 6 as control means for reciprocating the pressing rod 5 in the vertical direction. In addition, this 2nd material removal apparatus 1 is installed in the back | latter stage of the die-casting apparatus which is not shown in figure in a die-casting process.

  The control mechanism 6 is provided with a ball screw 8 rotatably in a cylinder 7 erected in the vertical direction above the support bar 4, and a drive provided on an output shaft of a servo motor 9 arranged in parallel with the cylinder 7. The rotation of the servo motor 8 is transmitted by a belt 12 stretched between the pulley 10 and a driven pulley 11 provided on the ball screw 8. The ball nut 13 screwed into the ball screw 8 is splined in the cylinder 7 and accommodated in a vertically movable and non-rotatable manner, and is integrally connected to the lower side of the ball nut 13 with a pressing rod. 5 are connected. Therefore, when the ball screw 8 is rotated by driving the servo motor 8, the ball nut 13 is screwed up and down, and the pressing rod 5 moves up and down integrally.

  Further, on the base 2 below the support bar 4, a band plate-like set plate 15 is laid in the left-right direction in a vertical posture in which the short width is the vertical direction, and at the center of the set plate 15, A receiving pin 16 positioned coaxially directly below the pressing rod 5 is provided so that the upper end protrudes from the upper surface of the set plate 15. In addition, a cylindrical discharge port 17 for discharging the second material removed from the cast product W is provided above the base 2 so as not to interfere with the set plate 15. A carriage 18 for discharging the second material can be carried into the table 2.

  Reference numeral 20 denotes an articulated robot as a holding means provided adjacent to the second material removing apparatus 1. The first and second arms 22 and 23 can be rotated around a horizontal axis on a base 21 that can be turned horizontally. A hand portion 24 having a well-known configuration and having a pair of clamping plates 25, 25 that can be opened and closed is connected to the tip of the second arm 23 so as to be rotatable about an axis. The base 21 and the arms 22 and 23 are each operated by driving a servo motor (not shown), and the holding plates 25 and 25 of the hand unit 24 are configured to open and close by an actuator using air as a drive source. The motor and the actuator are respectively controlled by a controller that stores a predetermined program. In addition, such an articulated robot is installed for taking out the casting W between the preceding die casting apparatus.

  In the second material removing apparatus 1 configured as described above, when the casting product W is cast by the preceding die casting apparatus, the preceding articulated robot grasps the side surface of the casting product W and removes it from the mold. It is transferred onto the base 2 of the material removing device 1. Then, the multi-joint robot 20 receives the casting product W from the upper and lower sides by the holding plates 25 and 25 of the hand portion 24, and receives the pressing rod 5 and the receiving pin 17 as shown by solid lines in FIGS. The hand part 24 is moved so that the second material W1 is positioned between them, and the cast product W is supported at this position. At this time, the pressing rod 5 stands by at the upper limit position shown in FIG.

  In this state, the servo motor 9 is driven to rotate the ball screw 8 to lower the pressing rod 5 together with the ball nut 13. Here, the lower end of the pressing rod 5 is the second material as shown by a two-dot chain line in FIG. The servo motor 9 is temporarily stopped at a position where it abuts on the upper surface of W 1, and then the servo motor 9 is driven again to lower the pressure rod 5 to a lower limit position where it abuts against the pin 17. Since the servo motor 9 has a characteristic that it can output with a torque three times the rated torque at the time of starting, even when the servo motor 9 is re-driven, the second material W1 is pressed downward with a strong force from the cast product W. Can be broken off. The second material W1 thus removed falls to the discharge port 18 and is collected by the carriage 19. During this time, the pressing rod 5 rises again to the upper limit position.

  Further, when there is a second material, the articulated robot 20 moves the casting W in the same procedure, and sets the next second material W1 between the pressing rod 5 and the receiving pin 17, and similarly the servo motor. 9 is driven to lower and stop the pressing rod 5 until it comes into contact with the second material W1, and then the servo motor 9 is driven again to lower the pressing rod 5 to break the second material. When the setting of the second material W1 by the articulated robot 20 and the folding of the second material W1 by the pressing rod 5 are repeated, and all the second material W1 is removed, the articulated robot 20 removes the cast product W. It is transported onto the conveyor 26 and delivered to the subsequent polishing step, etc., and a new casting W is received again from the preceding articulated robot, and the second material W1 is similarly removed. In this way, the drive control of the servo motor 9 that moves the pressing rod 5 up and down is also executed according to a preset program as in the articulated robot 20.

Thus, according to the second material removing apparatus 1 of the above-described form, the pressing rod 5 is moved forward with respect to the second material W1 in a state where the casting W is fixed, and the tip of the pressing rod 5 is the second material W1. After the pressing rod 5 is temporarily stopped at a position where it abuts against the die, the pressing rod 5 is moved forward again from there to break the second material W1, so that the mold for removing the second material W1 can be obtained. It becomes unnecessary and the second material W1 can be removed with a simple configuration, so that the cost is low and maintenance and changeover can be easily performed. In addition, since the pressing rod 5 is once brought into contact with the second material W1 and then broken, vibration and noise are not generated, and the casting W is less likely to be damaged such as cracking, so that improvement in quality can be expected. .
In particular, here, as the holding means, the articulated robot 20 provided with the hand portion 24 that grips the cast product W at the tip is adopted, so of course, the cast product W is moved along with the removal of the second material W1. Receipt of the cast product W from the process and delivery to the subsequent process can be performed quickly and in a short time, thereby contributing to improvement in production efficiency.

In addition, in the said form, although the press rod is employ | adopted as a press body, other shapes, such as not only a shaft body but a plate body, may be sufficient.
Further, the pressing body is not limited to the one that reciprocates from above the cast product, and depending on the shape or the like of the cast product, the second material may be folded by reciprocating from below or from the side.
Further, the control means is not limited to the one using a ball screw, and the pressing body may be reciprocated using another actuator such as a fluid pressure cylinder, and the holding means is a cast product other than the articulated robot. It is possible to appropriately change such as moving the base clamped by two-axis control using a ball screw or the like.

It is a front view of a 2nd material removal apparatus. It is a side view of a 2nd material removal apparatus. It is a top view of a 2nd material removal apparatus.

Explanation of symbols

  1 .... second material removal device, 2 .... base, 3 .... post, 4 .... support bar, 5 .... pressing rod, 6 .... control mechanism, 7 .... cylinder, 8 .... ball screw, 9 .. Servo motor, 13 ... Ball nut, 15 ... Set plate, 16 ... Receiving pin, 17 ... Discharge port, 18 ... Dolly, 20 ... Articulated robot, 21 ... Base, 24 ... Hand Part, 25 ... sandwiching plate.

Claims (3)

It is a method of removing using a pressing body that reciprocates the second material formed on the outer periphery of the cast product,
The pressing body is moved forward with respect to the second material in a state where the cast product is fixed, and the pressing body is temporarily stopped at a position where the tip of the pressing body abuts on the second material. The second material removing method, wherein the pressing member is moved forward again to break the second material. Holding means capable of holding a cast product having a second material formed on the outer periphery in a predetermined posture, a pressing body capable of reciprocating with respect to the second material of the cast product held by the holding means, and the pressing body A second material removing device comprising a control means for controlling the reciprocating motion of
The control means moves the pressing body forward with respect to the second material in a state in which the cast product is fixed by the holding means, and the pressing portion is positioned at a position where the tip of the pressing body contacts the second material. The second material removing apparatus, wherein after the body is temporarily stopped, the pressing body is moved again from there to operate the pressing body so as to break the second material.   3. The second material removing apparatus according to claim 2, wherein the holding means is an articulated robot having a hand portion for holding a cast product at a tip.

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