JP2011206792A - Die replacement method of molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To safely carry out replacement of dice without accidentally falling the die.SOLUTION: Retreating action of a movable dieplate receiving table 9 mounted with a movable die 6 by drive of a servo motor 8 for opening/closing the die is made to synchronize with advancing action of a fixed dieplate receiving table 12 arranged at a fixed die projecting cylinder 11 by drive of a hydraulic unit 14. When the movable die 6 and a fixed die 4 in a mutually abutted state are moved to a suspending position arranged between a fixed dieplate 5 and a movable dieplate 7 and being not in contact with them, operation is carried out while allowing the advancing action of the fixed die 4 mounted on the fixed dieplate receiving table 12 of the fixed die projecting cylinder 11 operated by the hydraulic unit 14 to follow the retreating action of the movable die 6 mounted on the movable dieplate receiving table 9 operated by the servo motor 8 for opening/closing the die.

Description

  The present invention relates to a die replacement method in a molding machine such as a die casting machine or an injection molding machine, and in particular, when removing a mold from the molding machine, the die casting can be taken out after moving the mold to a predetermined position where it can be easily lifted. The present invention relates to a mold change method for a machine.

  Conventionally, a die casting machine that manufactures a cast product by injecting and filling molten metal material into a mold cavity has a horizontal direction in which the movable die attached to the movable die plate is aligned with the fixed die attached to the fixed die plate. There is a so-called side-clamping die-casting machine in which the die is moved forward and backward. In such a die casting machine, when a movable die attached to a fixed die plate and a fixed die and a movable die plate is taken out of the machine for replacement, the movable die and the fixed die are connected by a connecting member. In a state of being integrally connected, the connected mold is removed from each of the fixed die plate and the movable die plate provided opposite to each other, and between the fixed die plate and the movable die plate and separated from each other. After being moved to an intermediate position where it can be lifted, the die connected integrally with a wire rope or the like is lifted to carry out the removal work outside the machine. For this reason, some die casting machines include a mold moving means for the purpose of moving a connected mold to a position where it can be lifted.

  In Patent Document 1, when exchanging a die provided in a die casting machine, a fixed die and a movable die are integrally connected by a connecting plate, and a fixed die is connected from a fixed plate, After removing the movable die, the piston rod of the air cylinder is advanced with air pressure, the connecting rod is gripped with the fork, and the piston rod of the hydraulic cylinder is advanced with hydraulic pressure, so that the die connected with the connecting rod is installed. Without changing the relative position between the mold cradle and the mold, the mold cradle is moved from the mold cradle to a predetermined position in the middle, and then the roller is rotated by driving the motor. Thus, a technique is disclosed in which a mold is pushed out onto a gantry provided on the side thereof and moved to a predetermined position where the mold can be taken out.

Japanese Patent No. 2969304

  However, according to the above-described die casting machine of Patent Document 1, although it is possible to move the mold to a predetermined position so that the mold does not fall from the mold cradle, it is realized. Therefore, there is no relative displacement in the positional relationship between the movable mold and fixed mold integrated with the connecting plate and the movable board side mold base and fixed board side mold base on which these are mounted. The movable plate side mold cradle and the fixed plate side mold cradle are connected with a connecting rod or the like to prevent relative displacement, but the movable plate side mold cradle and There are many connecting rods for connecting the fixed plate side mold cradle, forks for linking the connecting rod and the mold cradle, piston rods for moving the fork back and forth, and an air cylinder as a drive source. Need parts, and they Since it is provided with a left and right pair of squid strike machine parts is increased, becomes unsuitable for low cost reduce the cost.

  In addition, the movable mold and the fixed mold are integrated with the connecting plate, and the relative positional relationship between the movable board-side mold cradle and the fixed board-side mold cradle mounted with each of these changes. By connecting together so that there is no possibility, the positional relationship between the movable mold and the stationary mold and the movable board side mold cradle and the fixed board side mold cradle for mounting them will be the same, and the mold Although it is possible to prevent the mold from falling when moving the cradle, a mold cradle equipped with a mold that is integrally connected to the central position between the movable platen and the fixed platen. When moving, the piston rod of the hydraulic cylinder is advanced hydraulically while reversing the movable platen with a toggle mechanism and opening the mold.For example, the piston rod is moved at a speed that causes the movable platen to move backward. If the speed of advance is faster, connect The mold crowding out the movable platen side, linked mold mounted on the mold cradle, there is a possibility of causing a drop and displacement. Therefore, even if the movable mold and the fixed mold are connected and integrated, the movable board side mold base and the fixed board side mold base on which the movable mold and the fixed mold are mounted at the same interval. Even if the relative positional relationship between the mold and the mold cradle is not changed, it is not necessarily possible to prevent the mold from being displaced from the mold cradle and falling. Do not mean.

  Therefore, in order to reliably prevent the mold from dropping from the mold cradle, it is extremely important to precisely control the operation of the toggle mechanism that moves the movable plate backward and the operation of the piston rod. Regarding this point, Patent Document 1 does not suggest or disclose anything, and is simply mounted on each of the movable platen-side mold cradle and the fixed platen-side die cradle and integrally therewith. It is merely the content that the relative positional relationship between the connected movable mold and the fixed mold is the same to prevent the mold from dropping from the mold cradle.

  The present invention has been made in view of the above problems, and can reduce the cost by reducing the number of parts, and can also perform a mold replacement method for a molding machine that can perform a mold replacement safely and easily. The purpose is to provide.

The invention of the mold changing method of the molding machine according to claim 1
A fixed die plate to which a fixed mold is mounted;
A movable die plate equipped with a movable die plate and equipped with a movable die plate support for mounting the movable die;
A mold opening / closing servomotor as an electric drive source for moving the movable die plate back and forth in the mold opening / closing direction;
A fixed die projecting cylinder for advancing and retreating a fixed die plate receiving table on which the fixed die is placed using a hydraulic unit as a hydraulic drive source;
A die change method for a die casting machine in which the movable mold and the fixed mold are taken out of the machine and exchanged with other molds.
The movable die plate mounted on the movable die plate is moved to the movable die plate in a state where the movable die plate is moved forward and the movable die is closed with respect to the fixed die. A fixed die that is mounted on the movable die plate cradle and is mounted on the movable die plate cradle, and the fixed mold is mounted on the movable die plate so that the fixed mold is not detached from the fixed die plate. After placing on the plate cradle,
The movable die plate pedestal mounted on the movable die is driven by the servo motor for opening and closing the mold, and the fixed die plate pedestal provided in the fixed die protruding cylinder is driven by the hydraulic unit. The movable mold and the fixed mold that are in contact with each other to the lifting position between the fixed die plate and the movable die plate that are not in contact with each other. When moving the mold,
The fixed die plate provided on the fixed mold protruding cylinder operated by the hydraulic unit for the retreating operation of the movable mold mounted on the movable die plate receiving base operated by the mold opening / closing servo motor. The fixed mold placed on the cradle is operated while following the forward movement of the fixed mold.

The invention of the mold exchanging method of the molding machine according to claim 2 is described in claim 1,
When moving the movable mold and the stationary mold that are in contact with each other to the lifting position,
The operation of the movable die plate pedestal operated by the mold opening / closing servomotor is controlled to be the same as the moving speed of the fixed die plate pedestal operated by the hydraulic unit. Features.

The invention of the mold exchanging method of the molding machine according to claim 3 is described in claim 1,
When moving the movable mold and the stationary mold that are in contact with each other to the lifting position,
The forward movement driving force of the fixed die plate base operated by the hydraulic unit is larger than the backward movement driving force of the movable die plate base operated by the mold opening / closing servo motor, and the fixed die plate base is fixed. The mold is moved while pressing the movable mold when the mold is moved to the lifting position.

The invention of the mold exchanging method of the molding machine according to claim 4 is the invention according to claim 1,
When moving the movable mold and the stationary mold that are in contact with each other to the lifting position,
The forward movement driving force of the fixed die plate base operated by the hydraulic unit is made larger than the backward movement driving force of the movable die plate base operated by the mold opening / closing servo motor,
In a no-load state in which the fixed mold does not press the movable mold, the forward movement speed of the fixed die plate base on which the fixed mold is placed is the movable die plate base on which the movable mold is placed. While making it faster or at least the same as the reverse movement speed of
In a load state in which the fixed mold presses the movable mold, the forward movement speed of the fixed die plate base on which the fixed mold is placed and the movable die plate base on which the movable mold is placed The fixed mold is moved to the lifting position while pressing the movable mold so that the retreat operation speed is the same.

  According to the invention of the mold exchanging method of the molding machine, when taking out and exchanging the mold provided in the molding machine, a lifting position (fixed die plate) that can be easily lifted using lifting means such as a wire rope or a chain When moving the movable mold and the fixed mold which are in contact with each other to the position between the movable die plate and the movable die plate), physical means such as a connecting plate as in the past is used. Move the mold placed on the fixed die plate pedestal or movable die plate pedestal without dropping, without having to detach and attach the movable mold and fixed mold one by one Because it is possible, it is excellent in safety. In addition, in order to prevent the mold from falling, the connecting rod for connecting the movable plate side mold cradle and the fixed plate side mold cradle, and the connecting rod and the die cradle are connected. Fork, piston rod for moving the fork back and forth, and air cylinders as a drive source can be reduced without using many parts, so the cost of the product can be reduced and its value is It will be tremendous.

  Furthermore, the drive source that moves the movable mold is an electric drive source, and the drive source that moves the fixed mold is a hydraulic drive source. Therefore, by using each as a separate drive source, it is possible to easily finely adjust the operation speeds of the movable mold and the fixed mold, and the speed adjustment is easily performed so that these operation speeds are the same. be able to. Therefore, for example, when the drive source for moving the movable mold and the fixed mold is a single hydraulic drive source, it is difficult to adjust the hydraulic pressure and flow rate, and the operating speeds of the movable mold and the fixed mold are matched. Even so, fine adjustment is difficult and the mold may fall from the cradle, but such a problem can be prevented and safety can be improved.

It is a schematic block diagram of the die-casting machine which shows the state which moved the metal mold | die to the lifting position. It is a flowchart which shows operation | movement when moving a metal mold | die to a lifting position. It is a schematic block diagram of the die-casting machine which shows the state which moved the metal mold | die to the mold clamping completion position. It is a schematic block diagram of the die-cast machine which shows the state which moved the advance / retreat rod to the advance completion position.

  Embodiments of the present invention will be described below with reference to FIGS. Of course, it goes without saying that the present invention can be easily applied to configurations other than those described in the embodiments without departing from the spirit of the invention.

  As shown in FIG. 1, a die casting machine 1 as a lateral clamping mold machine of the present application includes a mold clamping device 2 and an injection device (not shown) as main components in the same manner as a known die casting machine. In the former mold clamping device 2, a fixed die plate 5 to which a fixed mold 4 is mounted, a movable die plate 7 to which a movable mold 6 is mounted, and a mold opening / closing servomotor 8 for moving the movable die plate 7 back and forth. The mold opening / closing and the like are performed by moving the movable mold 6 attached to the movable die plate 7 with respect to the fixed mold 4 with the servo motor 8 for mold opening / closing as an electric power source.

  In the die casting machine 1 of the present embodiment, the movable die plate 7 is provided with the movable die plate pedestal 9, and the movable die on which the movable mold is placed is placed on the movable die plate pedestal 9. A mold mounting portion is provided, and a plurality of rollers 10 are pivotally supported there. The axial center direction of the roller 10 is a horizontal direction orthogonal to the mold opening / closing direction.

  The fixed die plate 5 is provided with a fixed mold protruding cylinder 11 below the fixed die plate 5, and a fixed die plate support 12 is integrally provided at the tip of the advancing / retracting rod 11 a of the fixed mold protruding cylinder 11. . In addition, a stopper member 13 as a misalignment prevention member is provided on the upper portion of the fixed die plate receiving base 12 to prevent misalignment of the fixed mold 4 mounted thereon. Then, the fixed die plate receiving base 12 is moved in the mold opening / closing direction (see FIG. 1) as the advance / retreat rod 11a advances / retreats by the operation of the advance / retreat rod 11a of the fixed mold protruding cylinder 11 by the hydraulic unit 14 which is a hydraulic drive source. The fixed mold 4 that is advanced and retracted in the left and right direction and placed on the fixed mold placing portion of the fixed die plate base 12 can move in the mold opening and closing direction. The hydraulic unit 17 includes an accumulator (not shown), a hydraulic pump 15 that supplies hydraulic oil to the accumulator, and the like, and whether or not the pressure required to drive the cylinder 11 is accumulated in the accumulator. When the pressure in the accumulator is less than or equal to a predetermined pressure, hydraulic oil is supplied into the accumulator through the hydraulic pump 15 to accumulate pressure (charge), and the hydraulic pressure is reached when the pressure in the accumulator reaches the predetermined pressure. Control means 16 for stopping the pump 15 is provided.

  Next, the operation when taking out the mold attached to the die casting machine 1 in this embodiment and replacing it with another mold will be further described based on the flowchart shown in FIG. In this embodiment, when exchanging the mold, the position where the mold can be easily lifted using a lifting means such as a wire rope or a chain is defined as the lifting position, and the lifting position is a fixed die plate and a movable die plate. It is defined below as a position where the mold is not in contact with the mold, and will be described below.

  First, as shown in FIG. 3, the movable die plate 7 to which the movable mold 6 is mounted is advanced to the forward limit (the mold clamping completion position) by the mold opening / closing servo motor 8 (step 1), and the fixed mold. The advancing / retreating rod 11a of the mold protruding cylinder 11 is retracted to the retreat limit (step 2), and the fixed mold 4 and the movable mold 6 mounted on the fixed die plate 5 are in contact with each other (mold closed state). 2, the mold clamp (not shown) is removed, the fixed mold 4 is detachably mounted from the fixed die plate 5, the fixed mold 4 is placed on the fixed die plate receiving base 12, and the movable die plate is mounted. 7, the movable mold 6 is detachably attached to the movable die plate 7, and the movable mold 6 is placed on the movable die plate base 9 (step 3).

  Next, by the operation of the hydraulic unit 14, the fixed mold 4 mounted on the fixed die plate receiving base 12 is pressed against the movable mold 6 mounted on the movable die plate receiving base 9 to apply a load. When the movable die plate 7 is moved backward by operating the mold opening / closing servo motor 8 in this state (step 4), the fixed die plate base 12 and the movable die plate base 9 provided on the forward / backward rod 11a are synchronized. The movable mold 6 is moved in the mold opening direction, and the fixed mold 4 placed on the fixed die plate receiving base 12 is advanced by the advance / retreat rod 11a and is separated from the fixed die plate 5 (step 4, 5). Then, as shown in FIG. 4, when the forward / backward rod 11a completes the forward movement to the forward limit (step 6), the movable die plate 7 is subsequently opened to the mold opening completion position (step 7), and movable. As shown in FIG. 1, the mold 6 is separated from the movable die plate 7, and the fixed mold 4 and the movable mold 6 which are in contact with each other are moved to the lifting position to lift the wire rope or the chain. It is possible to lift the two molds (fixed mold 4 and movable mold 6) together using the means, and it is easy to take them out and replace them with other molds.

  In the step of moving the fixed mold 4 and the movable mold 6 in contact with each other to the lifting position, the reversing operation speed of the movable die plate 7 operated by the mold opening / closing servomotor 8 The speed is controlled so that the forward movement speed of the fixed die plate base 12 on which the fixed mold 4 is placed is the same, and the backward movement speed of the movable die plate base 9 is In addition to synchronizing the forward movement speed of the fixed die plate cradle 12, the backward movement driving force of the movable die plate 7 operated by the mold opening / closing servomotor 8 is used as the fixed mold 4 operated by the hydraulic unit 14. When the fixed mold 4 is moved together with the movable mold 6 to the lifting position, the movable mold 6 is moved while pressing the movable mold 6. More specifically, the forward movement speed of the fixed mold 4 operated by the hydraulic unit 14 is the same (synchronized) as the backward movement speed of the movable die plate 7 operated by the mold opening / closing servomotor 8. The control means 16 moves the stationary mold 4 so that the stationary mold 4 is faster (or at least the same speed) than the reversing operation speed of the movable mold 6 in a no-load state where the stationary mold 4 does not press the movable mold 6. By moving to the lifting position while pressing the mold 6, the stationary mold 4 and the movable mold 6 can be moved to the lifting position so as not to become unstable.

  According to the die changing method of the die casting machine 1 as the molding machine of the present embodiment as described above, when the dies 4 and 6 provided in the die casting machine 1 are taken out and exchanged together, a wire rope, a chain, etc. The movable mold 6 fixed to the lifting position (position between the fixed die plate 5 and the movable die plate 7 and not in contact therewith) which can be easily lifted using the lifting means and the fixed When the mold 4 is moved, the fixed die plate holder can be received without physically attaching and detaching the movable mold and the fixed mold one by one using physical means such as a connecting plate as in the prior art. The mold placed on the table or the movable die plate pedestal can be moved without dropping, which is excellent in safety. In addition, in order to prevent the mold from falling, the connecting rod for connecting the movable plate side mold cradle and the fixed plate side mold cradle, and the connecting rod and the die cradle are connected. Fork, piston rod for moving the fork back and forth, and air cylinders as a drive source can be reduced without using many parts, so the cost of the product can be reduced and its value is It will be tremendous.

  Further, the drive source for moving the movable mold 6 is an electric drive source, and the drive source for moving the fixed mold 4 is a hydraulic drive source. Therefore, by operating each with a separate drive source, the control means 16 can easily finely adjust the operation speeds of the movable mold 6 and the fixed mold 4. Therefore, for example, when the drive source for moving the movable mold and the fixed mold is a single hydraulic drive source, it is difficult to adjust the hydraulic pressure and flow rate, and the operating speeds of the movable mold and the fixed mold are matched. Even so, fine adjustment is difficult, and the mold may fall from the cradle, but such an unexpected situation can be prevented and safety can be improved.

DESCRIPTION OF SYMBOLS 1 Die-casting machine 4 Fixed die 5 Fixed die plate 6 Movable die 7 Movable die plate 8 Servo motor for mold opening / closing 9 Movable die plate stand 11 Fixed die protruding cylinder 12 Fixed die plate stand 14 Hydraulic unit

Claims (4)

A fixed die plate to which a fixed mold is mounted;
A movable die plate equipped with a movable die plate and equipped with a movable die plate support for mounting the movable die;
A mold opening / closing servomotor as an electric drive source for moving the movable die plate back and forth in the mold opening / closing direction;
A fixed die projecting cylinder for advancing and retreating a fixed die plate receiving table on which the fixed die is placed using a hydraulic unit as a hydraulic drive source;
A mold changing method for a molding machine in which the movable mold and the fixed mold are taken out of the machine and exchanged with other molds.
The movable die plate mounted on the movable die plate is moved to the movable die plate in a state where the movable die plate is moved forward and the movable die is closed with respect to the fixed die. A fixed die that is mounted on the movable die plate cradle and is mounted on the movable die plate cradle, and the fixed mold is mounted on the movable die plate so that the fixed mold is not detached from the fixed die plate. After placing on the plate cradle,
The movable die plate pedestal mounted on the movable die is driven by the servo motor for opening and closing the mold, and the fixed die plate pedestal provided in the fixed die protruding cylinder is driven by the hydraulic unit. The movable mold and the fixed mold that are in contact with each other to the lifting position between the fixed die plate and the movable die plate that are not in contact with each other. When moving the mold,
The fixed die plate provided on the fixed mold protruding cylinder operated by the hydraulic unit for the retreating operation of the movable mold mounted on the movable die plate receiving base operated by the mold opening / closing servo motor. A mold changing method for a molding machine, wherein the mold is operated while following the forward movement of the fixed mold placed on a cradle. When moving the movable mold and the stationary mold that are in contact with each other to the lifting position,
The operation of the movable die plate pedestal operated by the mold opening / closing servomotor is controlled to be the same as the moving speed of the fixed die plate pedestal operated by the hydraulic unit. The method for exchanging molds of a molding machine according to claim 1, wherein: When moving the movable mold and the stationary mold that are in contact with each other to the lifting position,
The forward movement driving force of the fixed die plate base operated by the hydraulic unit is larger than the backward movement driving force of the movable die plate base operated by the mold opening / closing servo motor, and the fixed die plate base is fixed. 2. The mold replacement method for a molding machine according to claim 1, wherein the mold is moved while pressing the movable mold when the mold is moved to the lifting position. When moving the movable mold and the stationary mold that are in contact with each other to the lifting position,
The forward movement driving force of the fixed die plate base operated by the hydraulic unit is made larger than the backward movement driving force of the movable die plate base operated by the mold opening / closing servo motor,
In a no-load state in which the fixed mold does not press the movable mold, the forward movement speed of the fixed die plate base on which the fixed mold is placed is the movable die plate base on which the movable mold is placed. While making it faster or at least the same as the reverse movement speed of
In a load state in which the fixed mold presses the movable mold, the forward movement speed of the fixed die plate base on which the fixed mold is placed and the movable die plate base on which the movable mold is placed 2. The mold changing method for a molding machine according to claim 1, wherein the fixed mold is moved to the lifting position while pressing the movable mold so that the retreat operation speed is the same.

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