JP2007136519A - Die casting machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate the anxiety that, in a die casting machine, the burrs of a metallic material, a misty liquid or the like are stuck to a rotation transfer system of transferring the rotation of a motor for die opening/closing to a ball screw mechanism and to the ball screw mechanism, and to attain low noise. <P>SOLUTION: In the die casting machine, a rotation transfer system for transferring the rotation of a motor 7 for die opening/closing to a ball screw mechanism 10, and the ball screw mechanism 10 are stored in a sealing structure. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric die casting machine, and more particularly, to a technique related to a die opening / closing device of a die casting machine for moving a movable die plate mounted with a movable die forward and backward.

  Conventional die-casting machines often have a hydraulic configuration, but hydraulic die-casting machines are fouled by oil, and high-precision operation control also has certain limits, so compared to hydraulic types. An electric die-casting machine using an electric servo motor as a drive source, which has a clean image and can be easily controlled with high precision, is becoming widespread.

  In such a die opening / closing device of an electric die casting machine, a ball screw mechanism that converts rotation of an electric servo motor (die opening / closing motor) into a linear motion is provided, and an axial movement portion of the ball screw mechanism and a toggle link mechanism are provided. By connecting the crosshead, the rotation of the mold opening / closing motor is converted into a linear motion and transmitted to the crosshead, which is the input terminal of the force of the toggle link mechanism. The plate is moved forward and backward. Further, the rotation of the mold opening / closing motor is transmitted to the rotation passive portion of the ball screw mechanism via a rotation transmission system including a pulley (toothed pulley) and a belt (timing bell). The rotation transmission system and the ball screw mechanism described above are normally exposed without a cover or the like.

  By the way, as described above, when the rotation transmission system that transmits the rotation of the mold opening / closing motor to the ball screw mechanism or the ball screw mechanism is exposed, in a die casting machine, fine burrs of metal materials such as aluminum, Since the mist liquid from the release material sprayed on the mold release surface flies, burrs and mist liquid easily adhere to the rotation transmission system and the ball screw mechanism of the mold opening and closing device, and the problem is that their life is shortened. is there. Further, if the above-described rotation transmission system and the ball screw mechanism are exposed, there is a possibility that noise is loud and hands may be caught in the belt during maintenance. Further, it has been pointed out that the conventional die opening and closing device of the die casting machine does not give much consideration to the maintainability and the workability at the time of maintenance is poor.

  The present invention has been made in view of the above points. The object of the present invention is to provide a rotation transmission system that transmits the rotation of a mold opening / closing motor to a ball screw mechanism, a burr of metal material, a mist liquid, etc. The object is to eliminate the risk of adhesion and to achieve low noise. Another object of the present invention is to make it possible to realize a machine that is excellent in maintainability of the mold opening and closing device.

In order to achieve the above object, in a typical invention of a die casting machine according to the present application, a tailstock and a movable die plate are connected, and the movable die plate is advanced or retracted by being driven to extend or fold. A toggle link mechanism, a mold opening / closing motor that is a drive source for moving the movable die plate back and forth, and a crosshead that is a force input terminal of the toggle link mechanism by converting the rotation of the mold opening / closing motor into a linear motion In a die casting machine equipped with a ball screw mechanism that transmits to
A holding cylinder whose one end is fixed to the tailstock;
The mold opening / closing motor is attached to the outside, and a pulley housing bracket with a sealed structure fixed to the other end of the holding cylinder,
An output shaft of the mold opening and closing motor positioned in the pulley storage bracket;
A driving pulley fixed to the output shaft and positioned within the pulley storage bracket;
A driven pulley that is located in the pulley storage bracket and that transmits the rotation of the driving pulley via a belt;
Fixing the driven pulley to an end thereof, and a screw shaft of the ball screw that is rotatably held at one end of the holding cylinder and is located in the holding cylinder;
A nut body of the ball screw mechanism that is screwed to the screw shaft and linearly transferred in the holding cylinder by rotation of the screw shaft;
One end side is fixed to the nut body, the other end side is fixed to the cross head, and a connecting cylinder body that can protrude and retract the holding cylinder body while maintaining an airtight state with one end side of the holding cylinder body,
Take the configuration provided.
The holding cylinder, the pulley housing bracket, the mold opening / closing motor, the mold opening / closing motor, by releasing the fixing of the holding cylinder to the tailstock and releasing the fixing of the connecting cylinder to the crosshead The rotation transmission system housed in the pulley housing bracket, the ball screw mechanism, and the unit member that is unitized including the connecting cylinder are configured to be removable.

According to the present invention, a pulley housing bracket having a sealing structure for a driving pulley, a belt, and a driven pulley, which is a rotation transmission system that transmits the rotation of a mold opening / closing motor to a ball screw mechanism that moves a crosshead of a toggle link mechanism back and forth. A ball screw that is housed in the ball screw mechanism and that is rotatably held at one end of the holding cylinder is positioned in the holding cylinder, and is screwed into the screw shaft to move linearly by the rotation of the screw shaft. The nut body of the mechanism is moved linearly within the holding cylinder, and one end side is fixed to the nut body and the other end side is fixed to the cross head, while maintaining an airtight state with one end side of the holding cylinder body Since the connecting cylinder that can move the holding cylinder in and out is provided and the ball screw mechanism also has a sealed structure, the rotation transmission that transmits the rotation of the mold opening and closing motor to the ball screw mechanism In addition, there is no risk of metal material burrs or mist-like liquids adhering to the ball screw mechanism, the life of the rotation transmission system or the ball screw mechanism can be extended, and the sound generated by the rotation transmission system or the ball screw mechanism can be reduced. Therefore, low noise can be achieved. Moreover, there is no possibility that the belt is caught in the belt, and the safety is excellent. Further, since the ball screw mechanism is housed in the sealed structure, there is no possibility that the lubricating oil of the ball screw mechanism is scattered around and the surroundings are soiled.
In addition to releasing the fixing of the holding cylinder to the tail stock and releasing the fixing of the connecting cylinder to the cross head, the holding cylinder, the pulley storage bracket, the mold opening / closing motor, and the pulley storage bracket are stored. Since the unit member including the rotation transmission system, the ball screw mechanism, and the connecting cylinder can be detached from the machine body side, the maintenance workability is excellent.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 relate to a die casting machine according to an embodiment of the present invention (hereinafter referred to as the present embodiment). FIG. 1 illustrates a process from a mold opening / closing motor to a toggle link mechanism in the die casting machine of the present embodiment. The principal part front view which fractured | ruptured one part which shows the transmission system of a mold opening / closing force, FIG. 2 is the principal part left view corresponding to the left side surface of FIG. 1 in the die-casting machine of this embodiment. In FIG. 2, a state where a cover of a pulley storage bracket having a sealing structure described later is removed is illustrated.

  1 and 2, reference numeral 1 denotes a tail stock which is maintained in a fixed state in a casting operation state. Between the four corners of the tail stock 1 and the four corners of a fixed fixing die plate (not shown). Four tie bars 2 (illustrated only in FIG. 2) are spanned, and the tie bar 2 is inserted and guided between the tailstock 1 and the fixed die plate so as to move forward and backward (not shown). A movable die plate is disposed. 3 is a toggle link mechanism in which the tailstock 1 and the movable die plate are connected (only a part of the toggle link mechanism is depicted in FIG. 1), and a cross head that is an input end of the force of the toggle link mechanism 3 3a is driven forward or backward as will be described later, the toggle link mechanism 3 is extended or retracted, and thereby a movable die plate (not shown) is driven forward or backward. ing. Then, the movable die plate is driven forward by the advance of the cross head 3a, and the movable side mold (not shown) mounted on the movable die plate is replaced with the fixed side mold (not shown) mounted on the fixed die plate (not shown). The mold is closed, and after the mold is closed, the crosshead 3a is further driven forward by a predetermined amount, whereby a predetermined mold clamping force is applied to the mold. After completion of mold clamping, molten metal is injected and filled into the mold from a metal melt injection device (not shown), and after the cast product in the mold is solidified and cooled, the movable die plate is driven backward by the retreat of the cross head 3a. As a result, mold opening is performed. The die opening and closing mechanism using the toggle link mechanism and the configuration of the molten metal pouring device in such a die casting machine are known.

  Reference numeral 4 denotes a holding cylinder that is horizontally planted in the central portion of the left side surface of the tail stock 1 and has one end fixed to the tail stock 1 by a mounting bolt 5. The holding cylinder 4 is sufficiently mechanical. It is configured to have strength. 6 is a pulley housing bracket having a hermetically sealed structure fixed to the other end side of the holding cylinder 4 by a mounting bolt 7, and includes a bracket body 6a and a cover 6b fixed to the bracket body 6a. It is configured to have sufficient mechanical strength.

  Reference numeral 7 denotes a mold opening / closing motor (electric servo motor for mold opening / closing) attached to the outside of the pulley housing bracket 6, and an output shaft 7 a of the mold opening / closing motor 7 is rotatable in the pulley storage bracket 6. Yes. Reference numeral 8 denotes a driving pulley (timing pulley which is a toothed pulley) fixed to the output shaft 7a of the mold opening / closing motor 7 and positioned in the pulley storage bracket 6, and 9 is positioned in the pulley storage bracket 6 and driven. It is a driven pulley (a timing pulley that is a toothed pulley) that transmits the rotation of the pulley 8 via a belt (not shown) (a timing belt that is a toothed belt located in the pulley storage bracket 6).

  A ball screw mechanism 10 includes a screw shaft 11 and a nut body 12 screwed to the screw shaft 11. The screw shaft 11 is rotatably held at the other end side of the holding cylinder 4. At the same time, it is positioned in the holding cylinder 4. A bearing holder 13 is fixed to the other end of the holding cylinder 4 by bolting, and the end of the screw shaft 11 is rotatably held via a bearing 14 held by the bearing holder 13. ing. The screw shaft 11 has an endmost portion located in the pulley storage bracket 6, and a driven pulley 9 is fixed to the endmost portion of the screw shaft 11. 8. It is transmitted to a screw shaft 11 (ball screw mechanism 10) via a belt (not shown) and a driven pulley 9. The nut body 12 of the ball screw mechanism 10 screwed to the screw shaft 11 is linearly transferred in the holding cylinder 4 by the rotation of the screw shaft 11.

  Reference numeral 15 denotes a connecting cylinder in which one end side is fixed to the nut body 12 of the ball screw mechanism 10 by bolting, the other end side is fixed to the cross head 3a of the toggle link mechanism 3 by the mounting bolt 16, and the ball screw mechanism The 10 linear motions are transmitted to the crosshead 3 a via the connecting cylinder 15. Reference numeral 17 denotes a sliding guide body which is fixed to one end side of the holding cylinder body 4 by bolting and has a sliding guide bush 18 fixed to the inner surface thereof. The connecting cylinder body 15 is airtight with the one end side of the holding cylinder body 4. The holding cylinder 4 can be projected and retracted while maintaining the above. The opening on the cross head 3a side of the connecting cylinder 15 is closed by the cross head 3a.

  In the present embodiment, as described above, the rotation storing system (driving pulley 8, unillustrated belt, driven pulley 9) for transmitting the rotation of the mold opening / closing motor 7 to the ball screw mechanism 10 is a pulley housing bracket 6 having a sealed structure. Thus, there is no risk of metallic material burrs or mist-like liquid adhering to the rotation transmission system that transmits the rotation of the mold opening / closing motor 7 to the ball screw mechanism 10, and the rotation transmission system. In addition, it is possible to achieve a longer service life, and to reduce the noise generated by the rotation transmission system. In addition, there is no risk of getting caught in the belt, and it is excellent in safety. In addition, since the ball screw mechanism 10 is also housed in the sealed structure, there is no risk of metal material burrs or mist-like liquid adhering to the ball screw mechanism 10, and the life of the ball screw mechanism can be extended. In addition, since the sound generated by the ball screw mechanism can be reduced, low noise can be achieved. Further, since the ball screw mechanism 10 is housed in the sealed structure, there is no possibility that the lubricating oil of the ball screw mechanism 10 scatters around and contaminates the surroundings.

  In the present embodiment, the holding cylinder 5 is fixed to the tailstock 1 and the mounting bolt 5 is removed, and the mounting bolt 16 that fixes the connecting cylinder 15 to the crosshead 3a is removed to remove the holding cylinder. The unit member including the body 4, the pulley housing bracket 6, the mold opening / closing motor 7, the rotation transmission system housed in the pulley housing bracket 6, the ball screw mechanism 10 and the connecting cylinder 15 is assembled from the machine body side. It can be removed. Therefore, at the time of maintenance, the unit member can be removed from the machine body side, and the unit member can be inspected and replaced, so that the maintenance workability is excellent.

It is the principal part front view which fractured | ruptured one part which shows the transmission system of the mold opening / closing force from the motor for mold opening / closing to the toggle link mechanism in the die-casting machine which concerns on one Embodiment of this invention. It is a principal part left view corresponding to the left side of FIG. 1 in the die-casting machine which concerns on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tailstock 2 Tie bar 3 Toggle link mechanism 3a Cross head 4 Holding cylinder 5 Mounting bolt 6 Pulley storage bracket 6a Bracket main body 6b Cover 7 Mold opening / closing motor 8 Drive pulley 9 Driven pulley 10 Ball screw mechanism 11 Screw shaft 12 Nut body 13 Bearing Holding body 14 Bearing 15 Connecting cylinder 16 Mounting bolt 17 Slide guide body 18 Slide guide bush

Claims (5)

A toggle link mechanism that connects a tailstock and a movable die plate and is driven to extend or fold, thereby moving the movable die plate forward or backward, and a mold opening / closing motor that is a drive source for moving the movable die plate back and forth And a ball screw mechanism that converts the rotation of the mold opening / closing motor into a linear motion and transmits it to a cross head that is an input end of the force of the toggle link mechanism, and a die casting machine comprising:
A die-casting machine comprising: a rotation transmission system for transmitting rotation of the mold opening / closing motor to the ball screw mechanism; and the ball screw mechanism housed in a sealed structure. In the die casting machine according to claim 1,
One end side of the tailstock is fixed to the tailstock, and the other end side is a holding cylinder that rotatably holds the screw shaft of the ball screw mechanism;
A nut body of the ball screw mechanism that is screwed to the screw shaft and linearly transferred in the holding cylinder by rotation of the screw shaft;
One end side is fixed to the nut body, the other end side is fixed to the cross head, and a connecting cylinder body that can protrude and retract the holding cylinder body while maintaining an airtight state with one end side of the holding cylinder body,
The rotation transmission system is housed therein, the mold opening / closing motor is attached to the outside thereof, and a pulley housing bracket having a sealed structure fixed to the other end of the holding cylinder,
Die-casting machine characterized by having. In the die-casting machine according to claim 2,
The holding cylinder, the pulley housing bracket, the mold opening / closing motor, the rotation transmission are released by releasing the fixing of the holding cylinder to the tailstock and releasing the fixing of the connecting cylinder to the cross head. A die casting machine characterized in that a unit member including a system, the ball screw mechanism, and the connecting cylinder is removable. A toggle link mechanism that connects a tailstock and a movable die plate and is driven to extend or fold to advance or retract the movable die plate, and a mold opening / closing motor that is a drive source for moving the movable die plate back and forth. And a ball screw mechanism that converts the rotation of the mold opening / closing motor into a linear motion and transmits it to a cross head that is an input end of the force of the toggle link mechanism, and a die casting machine comprising:
A holding cylinder whose one end is fixed to the tailstock;
The mold opening / closing motor is attached to the outside, and a pulley housing bracket with a sealed structure fixed to the other end of the holding cylinder,
An output shaft of the mold opening and closing motor positioned in the pulley storage bracket;
A driving pulley fixed to the output shaft and positioned within the pulley storage bracket;
A driven pulley that is located in the pulley storage bracket and that transmits the rotation of the driving pulley via a belt;
Fixing the driven pulley to an end thereof, and a screw shaft of the ball screw that is rotatably held at one end of the holding cylinder and is located in the holding cylinder;
A nut body of the ball screw mechanism that is screwed to the screw shaft and linearly transferred in the holding cylinder by rotation of the screw shaft;
One end side is fixed to the nut body, the other end side is fixed to the cross head, and a connecting cylinder body that can protrude and retract the holding cylinder body while maintaining an airtight state with one end side of the holding cylinder body,
Die-casting machine characterized by having. In the die-casting machine according to claim 4,
The holding cylinder, the pulley storage bracket, the mold opening / closing motor, and the pulley storage are released by releasing the fixing of the holding cylinder to the tailstock and releasing the fixing of the connecting cylinder to the cross head. A die casting machine characterized in that a unit member including a rotation transmission system housed in a bracket, the ball screw mechanism, and the connecting cylindrical body is removable.

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