JP5026196B2 - Clamping device and molding machine - Google Patents

Description

  The present invention relates to a mold clamping device and a molding machine. The molding machine is, for example, a die casting machine or an injection molding machine.

  After moving the moving die plate in the mold closing direction, the moving die plate and the tie bar fixed to the piston of the clamping cylinder provided on the fixed die plate are fastened by the half nut provided on the moving die plate. A mold clamping device is known in which a tie bar is extended by a mold clamping cylinder to clamp the mold (for example, Patent Documents 1 and 2). It should be noted that the half nut and the tie bar must be arranged at positions where the saw teeth formed on the half nut and the tie bar mesh with each other in the mold opening / closing direction.

  In Patent Document 1, the moving die plate is provided with a contact member that contacts the end of the tie bar on the moving die plate side when the mold is closed, and the position of the tie bar relative to the moving die plate (half nut) when the mold is closed is fixed. By doing so, a mold clamping device is disclosed in which the half nut and the tie bar are fastened reliably and quickly.

Patent Document 2 discloses a mold clamping device that finely adjusts a half nut and a tie bar to a meshable position by driving a piston (tie bar) of a mold clamping cylinder after making mold contact for each molding cycle. .
JP 2004-330552 A JP 2005-297020 A

  Patent Document 1 does not disclose mold thickness adjustment. In the technique of Patent Document 1, when the mold is replaced and the mold thickness is changed, the position of the tie bar when the mold is closed is changed with respect to the moving die plate by the action of the contact member before and after the mold replacement. Without changing, the position of the piston of the mold clamping cylinder changes with respect to the fixed die plate. As a result, for example, the stroke design of the clamping cylinder and the mold that can be used are limited.

  On the other hand, in the technique of Patent Document 2, since the position of the tie bar is finely adjusted with respect to the moving die plate for each molding cycle, as in Patent Document 1, the engagement between the tie bar and the moving die plate is ensured. Difficult to do quickly.

  An object of the present invention is to provide a mold clamping device and a molding machine that can suitably perform engagement between a tie bar and a movable die plate and perform mold thickness adjustment.

  The mold clamping device of the present invention includes a fixed die plate, a movable die plate that can move in a mold opening / closing direction with respect to the fixed die plate, the fixed die plate and a tie bar that is hung on the movable die plate, A mold opening / closing drive unit that drives the moving die plate in the mold opening / closing direction, a moving side engaging means that can engage or release the moving die plate and the tie bar, and is fixed to the moving die plate, A contact member capable of contacting the end of the tie bar on the movable die plate side in a mold closing direction; and a mold clamping drive unit having a movable part that can be driven in a mold opening / closing direction with respect to the fixed die plate. Fixed-side engaging means that is engaged with the movable part and engages or releases the engagement with the tie bar to engage or release the movable part and the tie bar. , A control device for controlling the fixed side engaging means, the moving side engaging means, the mold opening / closing drive section, and the mold clamping drive section. The movable die plate is moved in the mold closing direction by the mold opening / closing drive unit in a state where the engagement by the coupling means and the moving side engagement means is released, and the tie bar that is in contact with the contact member is moved. The fixed side engaging means is moved by driving the movable part to a position where the fixed side engaging means and the tie bar can engage with each other after the mold contact with the die plate. In the molding cycle, the engagement means is engaged with the tie bar, the engagement by the fixed side engagement means in the mold thickness adjustment is maintained, and the movement by the movement side engagement means is released. Da The plate is moved in the mold closing direction by the mold opening / closing drive unit to bring the abutting member into contact with the tie bar, the tie bar and the movable die plate are engaged by the moving side engaging means, and the moving side After the engagement by the engaging means and the mold contact, the fixed side engaging means, the moving side engaging means, and the movable side engaging means, so as to drive the movable portion in the direction of extending the tie bar and perform clamping. The mold opening / closing drive unit and the mold clamping drive unit are controlled.

  Preferably, there is provided a tie bar pulling drive unit that moves the tie bar to the fixed die plate side and pulls it from the moving die plate in a state where the engagement by the moving side engaging unit and the fixed side engaging unit is released. .

  Preferably, a plurality of the tie bars are provided, and the tie bar pulling drive unit is provided corresponding to at least a tie bar from which the tie bars are pulled out, and the control device performs the pulling out after the mold contact. The tie bar to be pulled is moved to the fixed die plate side by the tie bar pulling drive unit in a state where the engagement by the moving side engaging means and the fixed side engaging means is released. The tie bar that is not pulled out of the tie bars is engaged with the moving side engaging means and is released from the fixed side engaging means, and the mold opening / closing drive unit moves the moving die plate to the mold. The moving side engaging means, the fixed side engaging means, and the mold opening / closing drive unit are controlled to move in the opening direction.

  Preferably, each of the mold opening / closing drive unit and the tie bar pulling drive unit includes at least one of a hydraulic device and a pneumatic device.

  The molding machine of the present invention includes a fixed die plate that holds a fixed die, a movable die plate that holds a movable die and is movable in a mold opening / closing direction with respect to the fixed die plate, the fixed die plate, and the movable die. A tie bar that is hung on a plate, a mold opening / closing drive unit that drives the movable die plate in a mold opening / closing direction, and a moving side engagement means that can engage or release the moving die plate and the tie bar. A contact member fixed to the movable die plate and capable of contacting the end of the tie bar on the movable die plate side in the mold closing direction, and can be driven in the mold opening / closing direction with respect to the fixed die plate A mold clamping drive unit having a movable part and an engagement with the movable part, and the movable part and the tie bar are engaged or engaged by engaging or releasing the tie bar. Removable fixed-side engaging means, the fixed-side engaging means, the moving-side engaging means, the control device for controlling the mold opening / closing drive section and the mold clamping drive section, and the movement of the fixed die plate An injection device provided on a side opposite to the die plate and capable of supplying a molding material to a cavity constituted by the fixed die and the movable die, and the tie bar pulling drive unit is connected to the fixed die plate A fixed cylinder part, a piston sliding in the cylinder part, fixed to the piston, extending from the cylinder part to the opposite side of the fixed die plate to the moving die plate, and connected to the tie bar. The control device is in a state where the engagement by the fixed-side engaging means and the moving-side engaging means is released in the mold thickness adjustment. The movable die plate is moved in the mold closing direction by the mold opening / closing drive unit to move the tie bar in contact with the abutting member in the mold closing direction together with the movable die plate, and after the mold contact, the fixed side The fixed side engaging means is moved by driving the movable portion to a position where the engaging means and the tie bar can be engaged, and the fixed side engaging means is engaged with the tie bar. The movable die plate is moved in the mold closing direction by the mold opening / closing drive unit while maintaining the engagement by the fixed side engagement means in the thickness adjustment and releasing the engagement by the movement side engagement means. An abutting member is brought into contact with the tie bar, the tie bar and the moving die plate are engaged by the moving side engaging means, and engagement and mold contact by the moving side engaging means are performed. After being made, the fixed-side engaging means, the moving-side engaging means, the mold opening / closing drive section, and the mold clamping drive section are configured so as to perform mold clamping by driving the movable part in a direction in which the tie bar is extended. To control.

  According to the present invention, it is possible to suitably perform the engagement between the tie bar and the movable die plate and perform the mold thickness adjustment.

  1 to 3 are all front views including a sectional view of a part of a die casting machine 1 as a molding machine according to an embodiment of the present invention. FIG. 1 shows the mold opening state of the die casting machine 1. FIG. 2 shows the mold clamping state of the die casting machine 1. FIG. 3 shows the tie bar extraction state of the die casting machine 1.

  The die casting machine 1 includes a mold clamping device 3 that holds a fixed mold 101 and a movable mold 103, and a cavity Ca formed by the fixed mold 101 and the movable mold 103 (only positions are shown in FIGS. A specific shape is omitted.) An injection device 5 for supplying molten metal (shown only in FIG. 3), and a control device 7 for controlling the operation of the mold clamping device 3 and the injection device 5 (shown only in FIG. 1). ). In addition, although the die-casting machine 1 is equipped with the extrusion apparatus etc. which extrude a molded product from the moving metal mold 103 or the fixed metal mold | die 101 in addition to this, illustration is abbreviate | omitted.

  The mold clamping device 3 includes a base 9, a fixed die plate 11 that is provided on the base 9 and holds the fixed mold 101, a moving die plate 13 that is provided on the base 9 and holds the moving mold 103, It has an upper tie bar 15U and a lower tie bar 15D (hereinafter simply referred to as “tie bar 15”, which may not be distinguished from each other) hung on the fixed die plate 11 and the movable die plate 13.

  The base 9 is placed on, for example, a factory floor. The fixed die plate 11 and the movable die plate 13 are disposed on the base 9 so as to face each other. The fixed die plate 11 holds the fixed mold 101 on the mold mounting surface facing the movable die plate 13 and is fixed to the base 9. On the other hand, the movable die plate 13 holds the movable mold 103 on the mold mounting surface facing the fixed die plate 11 and can move in a direction (mold opening / closing direction) close to and away from the fixed die plate with respect to the base 9. Is provided.

  The fixed die 101 and the movable die 103 are closed by moving the moving die plate 13 in the direction close to the fixed die plate 11 (die closing direction) (see FIG. 2, however, FIG. Indicates the closing time.) Further, by moving the moving die plate 13 in a direction away from the fixed die plate 11 (die opening direction), the fixed die 101 and the moving die 103 are opened as shown in FIG.

  For example, a plurality of tie bars 15 are provided around the fixed mold 101 and the movable mold 103. Specifically, two upper tie bars 15U are provided at a position on the upper side with respect to the fixed mold 101 and the movable mold 103, and at a position on the lower side with respect to the fixed mold 101 and the movable mold 103. Two lower tie bars 15D are provided, for a total of four. For example, the four tie bars 15 are arranged symmetrically in the vertical and horizontal directions around the fixed mold 101 and the movable mold 103. The tie bar 15 has a length that can be hung on the fixed die plate 11 and the movable die plate 13 (for example, can penetrate the fixed die plate 11 and the movable die plate 13) at least in the mold closed state.

  As shown in FIG. 2, one end of the tie bar 15 is fixed to the moving die plate 13, and the other end of the tie bar 15 is behind the fixed die plate 11 with respect to the fixed die plate 11 (opposite to the moving die plate 13). Side, right side of FIG. 2), the tie bar 15 can be extended, and a mold clamping force corresponding to the extension amount can be generated.

  In the present application, the movement direction of members such as the tie bar 15 and the piston 31 to be described later is determined at a position behind the fixed die plate 11 so that the correspondence relationship with the movement direction of the movable die plate 13 can be easily understood. Even in movement, the direction toward the back side (right side of the drawing) of the fixed die plate 11 may be referred to as a mold closing direction, and the direction toward the moving die plate 13 (left side of the drawing) may be referred to as a mold opening direction.

  The mold clamping device 3 is constituted by a so-called composite mold clamping device, and has a driving means for performing mold opening and closing and a driving means for performing mold clamping separately. Specifically, the mold clamping device 3 includes a mold opening / closing cylinder 17 as a driving means for performing mold opening / closing and a mold clamping cylinder 19 as a driving means for performing mold clamping.

  The mold opening / closing cylinder 17 has a cylindrical cylinder portion 21, a piston 23 (shown only in FIG. 1) that can slide in the cylinder portion 21, and a rod 25 connected to the piston 23. . The piston 23 divides the inside of the cylinder portion 21 into two cylinder chambers, and the pressure oil (hydraulic fluid) is selectively supplied to one of the two cylinder chambers so that the piston 23 and the rod 25 advance and retreat. To do.

  For example, the mold opening / closing cylinder 17 is provided in the base 9 so that most of the mold opening / closing cylinder 17 is accommodated in the base 9. The mold opening / closing cylinder 17 is provided with a cylinder portion 21 on the fixed die plate 11 side in the base 9 so as to extend the rod 25 to the movable die plate 13 side. In other words, the mold opening / closing cylinder 17 is arranged such that the expansion / contraction direction coincides with the mold opening / closing direction.

  The cylinder portion 21 is fixed with respect to the base 9. That is, the cylinder part 21 is indirectly fixed to the fixed die plate 11. On the other hand, the rod 25 is fixed to the moving die plate 13. Accordingly, the movable die plate 13 moves in the mold opening / closing direction by the expansion / contraction of the mold opening / closing cylinder 17.

  Note that an appropriate number of mold opening / closing cylinders 17 may be provided. For example, only one mold opening / closing cylinder 17 may be provided, or two mold opening / closing cylinders 17 may be provided symmetrically with respect to the center of the left and right of the fixed die plate 11 and the movable die plate 13 (the center in the paper penetration direction).

  The mold clamping cylinder 19 has, for example, a cylinder part 29 built in the fixed die plate 11 and a piston 31 that can slide in the cylinder part 29.

  The cylinder part 29 is formed integrally with the fixed die plate 11 or is formed by a separate member built in the fixed die plate 11. Inside the cylinder portion 29, a first small-diameter chamber 29a that opens to the mold mounting surface side of the fixed die plate 11 and a large-diameter chamber 29b that communicates with the first small-diameter chamber 29a and has a larger diameter than the first small-diameter chamber 29a. And a second small-diameter chamber 29 c that communicates with the large-diameter chamber 29 b and opens to the back side of the fixed die plate 11.

  The piston 31 includes a first small diameter portion 31a that can slide in the first small diameter chamber 29a, a large diameter portion 31b that can slide in the large diameter chamber 29b, and a second small diameter portion that can slide in the second small diameter chamber 29c. 31c. The large-diameter portion 31b divides the large-diameter chamber 29b into two cylinder chambers, and the piston 31 advances and retreats when pressure oil (hydraulic fluid) is selectively supplied to the two cylinder chambers. The first small diameter portion 31a (first small diameter chamber 29a) and the second small diameter portion 31c (second small diameter chamber 29c) may have the same diameter or different diameters. In addition, in this embodiment, the case of the same diameter is illustrated.

  As will be described later, the tie bar 15 and the piston 31 can be engaged or released by a fixed-side half nut 33, and the tie bar 15 and the moving die plate 13 are engaged by a moving-side half nut 35. Or the engagement can be released.

  Therefore, as shown in FIG. 2, the piston 31 is driven to the rear side of the fixed die plate 11 with the tie bar 15 and the movable die plate 13 engaged and the tie bar 15 and the piston 31 engaged. Thus, the tie bar 15 is extended, and a mold clamping force corresponding to the extension amount is generated.

  The mold clamping cylinders 19 are provided in the same number as the tie bars 15 corresponding to the plurality of tie bars 15. Therefore, one mold clamping cylinder 19 can extend one tie bar 15 independently of the other tie bars 15.

  The engagement between the tie bar 15 and the piston 31 by the fixed-side half nut 33 is performed as follows.

  The piston 31 is formed with a hole portion 31d that penetrates the first small diameter portion 31a, the large diameter portion 31b, and the second small diameter portion 31c in the mold opening / closing direction. The hole 31 d opens on the mold mounting surface side of the fixed die plate 11 and opens on the back side of the fixed die plate 11. The tie bar 15 is slidably inserted into the hole 31d, and the end on the fixed die plate 11 side can be protruded to the back side of the fixed die plate 11 through the hole 31d.

  A fixed-side engaged portion 15a is formed at the end of the tie bar 15 on the fixed die plate 11 side. The fixed-side engaged portion 15 a is configured, for example, by forming a plurality of grooves extending in the circumferential direction of the tie bar 15 at a constant pitch in the extending direction of the tie bar 15 on the outer peripheral surface of the tie bar 15. On the other hand, the fixed-side half nut 33 has protrusions that can be engaged with the groove of the fixed-side engaged portion 15a at the same pitch as the groove of the fixed-side engaged portion 15a in the extending direction of the tie bar 15. .

  The fixed-side half nut 33 and the piston 31 are engaged in the extending direction of the tie bar 15. For example, the second small-diameter portion 31c of the piston 31 protrudes from the back side of the fixed die plate 11 and is behind the fixed die plate 11 with respect to a support body (not shown) that supports the fixed side half nut 33 so that it can be opened and closed. It is in contact with the direction. Therefore, when the piston 31 moves to the back side of the fixed die plate 11, the fixed side half nut 33 also moves to the back side of the fixed die plate 11.

  The fixed-side half nut 33 moves to the moving die plate 13 side when the piston 31 moves to the moving die plate 13 side. This may be realized, for example, by fixing the piston 31 and a support body (not shown) of the fixed-side half nut 33 with a screw or the like, or urging the fixed-side half nut 33 toward the movable die plate 13 side. This may be realized by providing an urging means. The engagement of the fixed half nut 33 and the piston 31 is performed both in the open state and in the closed state.

  When the fixed side half nut 33 is closed, the fixed side half nut 33 meshes with the fixed side engaged portion 15 a of the tie bar 15, and the tie bar 15 and the piston 31 are connected to the tie bar 15 via the fixed side half nut 33. By engaging with each other in the extending direction and opening the fixed-side half nut 33, the engagement between the fixed-side half nut 33 and the fixed-side engaged portion 15 a of the tie bar 15 is released, and the engagement between the tie bar 15 and the piston 31 is released. The match is released.

  The opening / closing of the stationary half nut 33 is performed by, for example, a half nut opening / closing cylinder 37 provided on the stationary die plate 11. The half nut opening / closing cylinder 37 is movable in the extending direction of the tie bar 15 with respect to the fixed die plate 11 in accordance with the movement of the fixed side half nut 33 in the extending direction of the tie bar 15 with respect to the fixed die plate 11. It is supported on the fixed die plate 11 by an appropriate support mechanism such as.

  The tie bar 15 and the movable die plate 13 are engaged with each other by the moving side half nut 35 as follows.

  A moving side engaged portion 15b is formed at the end of the tie bar 15 on the moving die plate 13 side. The moving-side engaged portion 15b has, for example, a plurality of grooves extending in the circumferential direction of the tie bar 15 on the outer peripheral surface of the tie bar 15 at a constant pitch in the extending direction of the tie bar 15, similarly to the fixed-side engaged portion 15a. It is comprised by forming.

  On the other hand, the moving-side half nut 35 has protrusions engageable with the groove of the moving-side engaged portion 15b at the same pitch as the groove of the moving-side engaged portion 15b in the extending direction of the tie bar 15. . The moving side half nut 35 is provided on the moving die plate 13. In other words, the moving half nut 35 is provided so as not to move in the extending direction of the tie bar 15 with respect to the moving die plate 13.

  When the moving side half nut 35 is closed, the moving side half nut 35 is engaged with the moving side engaged portion 15b of the tie bar 15, and the tie bar 15 and the moving die plate 13 are engaged with each other in the extending direction of the tie bar 15. When the moving side half nut 35 is opened, the meshing between the moving side half nut 35 and the moving side engaged portion 15 b of the tie bar 15 is released, and the direction in which the tie bar 15 extends between the tie bar 15 and the moving die plate 13. The engagement at is released.

  The opening and closing of the moving side half nut 35 is performed by, for example, a half nut opening / closing cylinder 39 provided on the moving die plate 13. The half nut opening / closing cylinder 39 is fixed to the moving die plate 13.

  The movable die plate 13 is provided with a contact portion 41 that contacts the end portion of the tie bar 15. The abutting portion 41 is fixed to the movable die plate 13, and when the end of the tie bar 15 is abutted against the abutting portion 41, the moving-side half nut 35 and the moving-side engaged portion 15b are engaged with each other. It is provided so that it may be located in. That is, the abutting portion 41 has a displacement of less than one pitch between the plurality of protrusions of the movement-side half nut 35 and the plurality of grooves of the movement-side engaged portion 15b. The nut 35 is prevented from being closed.

  The contact portions 41 are provided in the same number as the tie bars 15 corresponding to the plurality of tie bars 15. The plurality of contact portions 41 may be formed integrally with each other, or may be formed individually. Moreover, the contact part 41 may be comprised integrally with the support body of the movement side half nut 35, and / or the cylinder part of the half nut opening-and-closing cylinder 39, and does not need to be comprised integrally.

  The mold clamping device 3 includes a tie bar pulling cylinder 43 that pulls the upper tie bar 15U out of the plurality of tie bars 15 toward the fixed die plate 11 for mold replacement.

  The tie bar extraction cylinder 43 has a cylindrical cylinder portion 45, a piston 47 (shown only in FIG. 1) that can slide in the cylinder portion 45, and a rod 49 connected to the piston 47. . The piston 47 divides the inside of the cylinder portion 45 into two cylinder chambers, and the piston 47 and the rod 49 advance and retract when pressure oil (hydraulic fluid) is selectively supplied to one of the two cylinder chambers. To do.

  The tie bar pulling cylinder 43 is disposed so as to extend the rod 49 to the back side (right side of the drawing) of the fixed die plate 11. In other words, the tie bar pulling cylinder 43 is arranged with its expansion / contraction direction coincident with the mold opening / closing direction.

  The cylinder part 45 is fixed to the fixed die plate 11. Specifically, the cylinder part 21 is fixed to the upper part of the fixed die plate 11. The cylinder portion 21 has an end opposite to the extending direction of the rod 49 that does not protrude from the end of the fixed die plate 11 on the mold mounting surface side, and the end on the mold mounting surface side. It arrange | positions so that it may correspond in general with a part.

  The rod 49 of the tie bar pulling cylinder 43 is connected to the upper tie bar 15U on the back side of the fixed die plate 11 by a connecting member 51.

  The connecting member 51 includes, for example, a shaft portion 51a that extends from the end portion of the upper tie bar 15U in the same direction as the direction in which the upper tie bar 15U extends, and a hanging portion 51b that is hung on the shaft portion 51a and the rod 49. And connecting the end of the rod 49 and the end of the upper tie bar 15U. In the present embodiment, the shaft portion 51a is described as a part of the connecting member 51. However, the shaft portion 51a is configured as a part of the tie bar 15, and the connecting member 51 is configured only by the hanging portion 51b. May be.

  The injection device 5 is not particularly shown, but an injection sleeve that penetrates the fixed die plate 11 and communicates with the cavity Ca through the fixed mold 101, an injection plunger that can slide in the injection sleeve, and drives the injection plunger An injection cylinder 53 (only a part of which is shown in FIG. 3) is included. As shown in FIG. 3, the injection device 5 is provided behind the fixed die plate 11.

  The control device 7 includes, for example, a computer having a CPU, a ROM, a RAM, an external storage device and the like, although not particularly illustrated. The control device 7 controls operations of the mold clamping device 3, the injection device 5, an unillustrated extrusion device, and the like. For example, the control device 7 controls the mold opening / closing cylinder 17, the mold clamping cylinder 19, the half nut opening / closing cylinders 37 and 39, and the tie bar pulling cylinder 43 based on preset information and signals from a position sensor and a pressure sensor (not shown). In addition, a control signal is output to a pump and an electromagnetic valve of a hydraulic circuit (not shown) that supplies pressure oil to the injection cylinder 53 and the like of the injection device 5. The control device 7 can also be regarded as a control device for the mold clamping device 3.

  The operation of the die casting machine 1 having the above configuration will be described.

  First, the operation in mold thickness adjustment will be described.

  The initial state of mold thickness adjustment is generally a state in which the fixed-side half nut 33 is opened in the state shown in FIG. That is, the movable die plate 13 is disposed at a predetermined mold opening position, and the fixed mold 101 and the movable mold 103 are separated from each other. The fixed half nut 33 and the moving half nut 35 are opened, and the tie bar 15 is not engaged with the fixed die plate 11 and the moving die plate 13. The mold opening position may be the same position as the mold opening position in a molding cycle described later, or may be a different position.

  From this state, the control device 7 controls the mold opening / closing cylinder 17 to move the movable die plate 13 in the mold closing direction. Due to the movement of the movable die plate 13, the contact portion 41 provided on the movable die plate 13 contacts the tie bar 15. As a result, the tie bar 15 is pushed by the contact portion 41 and moves in the mold closing direction together with the movable die plate 13.

  Thereafter, when the fixed mold 101 and the movable mold 103 come into contact with each other, the control device 7 moves the piston 31 of the clamping cylinder 19 to move the fixed-side half nut 33 and the fixed-side engaged portion 15 a of the tie bar 15. The fixed-side half nut 33 is moved to a position where can be engaged with each other.

  Here, since there are a plurality of positions within the stroke of the piston 31 where the fixed-side half nut 33 and the fixed-side engaged portion 15a of the tie bar 15 can mesh, the control device 7 follows the predetermined conditions. One meshing position is selected from a plurality of meshing positions. For example, the control device 7 selects the one where the piston 31 is located closest to the movable die plate 13 from a plurality of meshing positions. In addition, for example, the control device 7 may fix and / or fix the piston 31 to a movable die plate 13 side from a plurality of meshing positions at a predetermined amount (for example, an amount necessary for a mold release operation after molding described later). A position that can be moved to the die plate 11 side by a predetermined amount (for example, an amount necessary for mold clamping described later) or more is selected.

  Note that the control device 7 determines whether or not the mold contact has occurred, for example, a detection value of a pressure sensor (not shown) that detects the hydraulic pressure of the mold opening / closing cylinder 17 or a detection value of a position sensor (not shown) that detects the position of the tie bar 15. This can be determined based on the speed of the tie bar 15 based on the above.

  Further, the control device 7 determines the position at which the fixed-side half nut 33 and the fixed-side engaged portion 15a of the tie bar 15 can mesh with each other, for example, a detection value of a position sensor (not shown) that detects the position of the tie bar 15; It can be calculated based on the detection value of a position sensor (not shown) that detects the position of the piston 31 or the fixed-side half nut 33 and information such as the position of the fixed-side engaged portion 15a with respect to the tie bar 15 recorded in advance. .

  When the fixed-side half nut 33 is moved to a position where the fixed-side half nut 33 and the fixed-side engaged portion 15a of the tie bar 15 can engage with each other, the control device 7 closes the fixed-side half nut 33 and closes the fixed-side half nut 33. The nut 33 and the fixed-side engaged portion 15a are engaged with each other, whereby the piston 31 and the tie bar 15 are engaged.

  Then, the control apparatus 7 controls each part so that operation | movement prepared for the start of a shaping | molding cycle is performed. For example, the control device 7 moves the movable die plate 13 to the mold opening position shown in FIG. And the control apparatus 7 complete | finishes control for mold thickness adjustment.

  Next, the operation in the molding cycle of the die casting machine 1 will be described.

  At the start of the molding cycle, as shown in FIG. 1, the movable die plate is located at the mold opening position, and the fixed mold 101 and the movable mold 103 are separated from each other. The fixed-side half nut 33 is kept in mesh with the fixed-side engaged portion 15a of the tie bar 15 in the mold thickness adjustment. The piston 31 of the mold clamping cylinder 19 is closer to the movable die plate 13 than the position when the fixed-side half nut 33 and the fixed-side engaged portion 15a are engaged in the mold thickness adjustment (position when the mold contacts). positioned. The moving side half nut 35 is opened, and the moving die plate 13 and the tie bar 15 are not engaged with each other. The end of the tie bar 15 on the moving die plate 13 side is separated from the contact portion 41.

  The mold opening position of the movable die plate 13 is set to a position where processes such as extrusion and unloading of a molded product, which will be described later, can be performed. Further, the mold opening position of the movable die plate 13 may be a position corresponding to a physical limit position of the stroke of the slider or the mold opening / closing cylinder 17 that supports the movable die plate 13, or within the range of the stroke. The position may be set as appropriate by the manufacturer or user.

  The control device 7 controls the mold opening / closing cylinder 17 via a hydraulic circuit (not shown) so as to move the movable die plate 13 in the mold closing direction from the mold open state of FIG. When the movable die plate 13 moves in the mold closing direction, the contact portion 41 provided on the movable die plate 13 contacts the end portion of the tie bar 15 on the movable die plate 13 side.

  As a result, the tie bar 15 is pushed by the contact portion 41 and moves in the mold closing direction together with the movable die plate 13. Further, since the piston 31 of the mold clamping cylinder 19 is engaged with the tie bar 15 by the fixed-side half nut 33, it moves together with the tie bar 15 in the mold closing direction.

  The control device 7 closes the moving-side half nut 35 while the moving die plate 13 and the tie bar 15 are both moving in the mold closing direction. Thereby, the movable die plate 13 and the tie bar 15 are engaged with each other.

  Thereafter, the fixed mold 101 and the movable mold 103 come into mold contact. The position of the piston 31 at this time is a position when the fixed-side half nut 33 and the fixed-side engaged portion 15a of the tie bar 15 are engaged with each other in the mold thickness adjustment.

  The control device 7 appropriately sets a target speed of the moving die plate 13, and based on the set speed and a speed based on a detection value of a position sensor (not shown) that detects the position of the moving die plate 13 and the like. Thus, the speed of the moving die plate 13 is controlled.

  For example, the control device 7 moves the moving die plate 13 at a relatively high speed from the start of mold closing to immediately before the mold contact so as to reduce the impact at the time of mold contact while shortening the molding cycle, and immediately before the mold contact. Slow down. Note that the position of the mold contact is detected by, for example, a position sensor (not shown) that detects the position of the movable die plate 13 or the like when adjusting the mold thickness.

  Further, for example, the control device 7 decelerates the moving die plate 13 immediately before the contact portion 41 contacts the tie bar 15, and alleviates the impact between the contact portion 41 and the tie bar 15. The position where the contact portion 41 contacts the tie bar 15 is detected by, for example, a position sensor (not shown) that detects the position of the movable die plate 13 and a position sensor (not shown) that detects the position of the tie bar 15 during mold thickness adjustment. Calculated based on the value.

  When the fixed mold 101 and the movable mold 103 come into contact with each other, the control device 7 moves the piston 31 of the mold clamping cylinder 19 to the back side of the fixed die plate 11. As a result, as shown in FIG. 2, the tie bar 15 is extended by the fixed-side engaged portion 15a being pulled to the rear side of the fixed die plate 11, and a mold clamping force corresponding to the extension amount is generated.

  When the mold clamping force reaches a predetermined value and the mold clamping is completed, the control device 7 controls the injection device 5 to supply the molten metal to the cavity Ca. That is, molten metal is supplied to an injection sleeve (not shown) communicating with the cavity Ca by a ladle or the like, and an injection plunger (not shown) is advanced by the injection cylinder 53 in the injection sleeve. Thereby, the molten metal is injected and filled into the cavity Ca. And the molten metal with which the cavity Ca was filled solidifies, and a molded article is formed. The mold clamping cylinder 19 is controlled so as to maintain a predetermined mold clamping force even during the injection and filling of the molten metal.

  When the molten metal is solidified to form a molded product, the control device 7 moves the piston 31 of the mold clamping cylinder 19 to the movable die plate 13 side so as to release the tension applied to the tie bar 15 and eliminate the mold clamping force. Move to.

  Further, the control device 7 moves the piston 31 toward the moving die plate 13 until the fixed mold 101 and the moving mold 103 are slightly separated from each other. That is, at the time of mold thickness adjustment, the piston 31 is moved to the movable die plate 13 side from the position where the fixed side half nut 33 and the fixed side engaged portion 15a of the tie bar 15 are meshed (position where the mold contacts). As a result, the mold is released with a relatively large force, and the tie bar 15 moves to a position where it can come into contact with the contact portion 41 before the mold contact in the next molding cycle.

  Thereafter, the control device 7 opens the moving-side half nut 35 and releases the engagement between the moving die plate 13 and the tie bar 15. The moving side half nut 35 is after the mold clamping force is released (after reaching the position when the tie bar 15 comes into contact with the mold) and before the tie bar 15 further moves to the moving die plate 13 side. May be opened.

  Then, the control device 7 controls the mold opening / closing cylinder 17 so as to move the movable die plate 13 to the mold opening position shown in FIG. When the mold is opened, the molded product is pushed out from the fixed mold 101 or the movable mold 103 by an unillustrated extrusion device and is carried out from the mold clamping device 3. Further, after the mold is opened, preparation for the next cycle such as cleaning of the fixed mold 101 and the movable mold 103 and application of a release agent is performed. Then, the next molding cycle is started.

  Next, the operation | movement at the time of metal mold | die replacement | exchange of the die-casting machine 1 is demonstrated.

  At the start of mold replacement, the die casting machine 1 is assumed to be in a state where the molding cycle is completed, that is, in the mold open state of FIG. Then, the control device 7 performs mold closing until the mold comes into contact as in the mold closing in the above molding cycle. However, in this mold closing, it is not necessary to close the moving-side half nut 35 after the abutting portion 41 abuts on the tie bar 15 unlike the mold closing in the molding cycle. Moreover, the fixed side half nut 33 may be opened.

  After the mold contact, an operator or the like prepares to transport the fixed mold 101 and the movable mold 103 in a combined state. For example, the fixed mold 101 and the movable mold 103 are both attached to the crane, and the fixation between the fixed mold 101 and the fixed die plate 11 and the fixation between the movable mold 103 and the movable die plate 13 are released. At this time, the fixed mold 101 may remain attached to the fixed die plate 11.

  When a signal indicating that work such as attachment of the fixed mold 101 and the movable mold 103 to the crane has been completed is input to the control device 7 by an operator, the control device 7 fixes the upper tie bar 15U. The engagement at the side engaged portion 15a and the movement side engaged portion 15b is released, the lower tie bar 15D is released from the engagement at the fixed side engaged portion 15a, and is engaged at the movement side engaged portion 15b. The fixed-side half nut 33 and the moving-side half nut 35 are controlled so as to be in a state in which the above is performed. Note that the control of the fixed half nut 33 and the movable half nut 35 may be performed partly or entirely before the end of the work by the operator, for example, before the mold contact or immediately after the mold contact. Good.

  Thereafter, the control device 7 moves the upper tie bar 15U to the rear side (right side of the drawing) of the fixed die plate 11 by the tie bar pulling cylinder 43. Thereby, as shown in FIG. 3, the upper tie bar 15 </ b> U moves further to the rear side of the fixed die plate 11 than the position at the time of mold contact, and is pulled out from the movable die plate 13. The upper tie bar 15U is pulled out, for example, until the end on the movable die plate 13 side is located at a position that is substantially coincident with the mold mounting surface of the fixed die plate 11 or slightly retracted from the mold mounting surface. It is.

  Further, the control device 7 moves the movable die plate 13 in the mold opening direction by the mold opening / closing cylinder 17. Thereby, as shown in FIG. 3, a predetermined mold opening position is reached. Since the lower tie bar 15D is engaged with the moving die plate 13 by the moving side half nut 35, the lower tie bar 15D moves in the mold opening direction together with the moving die plate 13. As can be seen from the comparison between FIG. 1 and FIG. 3, the position of the lower tie bar 15D when the tie bar is pulled out is a position moved in the mold opening direction from the position of the lower tie bar 15D when the mold is opened in the molding cycle. ing.

  Note that the movement of the upper tie bar 15U in the mold closing direction and the movement of the lower tie bar 15D in the mold opening direction may be performed simultaneously, or one of them may be performed first. Further, the mold opening position of the movable die plate 13 at the time of pulling out the tie bar may be the same as or different from the mold opening position in the molding cycle.

  Thereafter, the fixed mold 101 and the movable mold 103 are carried out upward or sideward by a crane or the like while being combined with each other. Then, the new fixed mold 101 and the movable mold 103 are carried in between the fixed die plate 11 and the movable die plate 13 by a crane or the like while being combined with each other.

  After the new fixed mold 101 and the moving mold 103 are carried in, the control device 7 performs mold closing by the mold opening / closing cylinder 17. Then, the fixed mold 101 is fixed to the fixed die plate 11 and the movable mold 103 is fixed to the movable die plate 13 by an operator or the like.

  When the fixation of the fixed die plate 11 and the movable die plate 13 is completed, the control device 7 prepares for the mold thickness adjustment described above. That is, the control device 7 moves the upper tie bar 15U to the moving die plate 13 side by the tie bar pulling cylinder 43. The movable die plate 13 is moved to the mold opening position by the mold opening / closing cylinder 17. The tie bar 15 is moved to the moving die plate 13 side by a predetermined distance, for example, by engaging the moving die plate 13 and the tie bar 15 until the moving die plate 13 is moved halfway in the mold opening direction. Open the stationary half nut 33 and the moving half nut 35. Then, the above-described mold thickness adjustment is performed.

  According to the above embodiment, the control device 7 of the mold clamping device 3 opens and closes the movable die plate 13 in a state where the engagement by the fixed-side half nut 33 and the movable-side half nut 35 is released in the mold thickness adjustment. The cylinder 17 is moved in the mold closing direction to move the tie bar 15 in contact with the contact portion 41 together with the moving die plate 13 in the mold closing direction. After the mold contact, the fixed-side half nut 33 and the tie bar 15 are engaged. The fixed-side half nut 33 is moved to a possible position by driving the piston 31, and the fixed-side half nut 33 is engaged with the tie bar 15. In the molding cycle, the engagement by the fixed-side half nut 33 in mold thickness adjustment is maintained. In addition, the movable die plate 13 is closed by the mold opening / closing cylinder 17 in a state where the engagement by the moving side half nut 35 is released. To move the contact portion 41 to the tie bar 15, move the tie bar 15 together with the moving die plate 13 in the mold closing direction, and engage the tie bar 15 and the moving die plate 13 with the moving side half nut 35. After the engagement and mold contact by the moving side half nut 35 are performed, the fixed side half nut 33, the moving side half nut 35, and the mold opening / closing are performed so that the piston 31 is driven in the direction of extending the tie bar 15 to perform the mold clamping. Since the cylinder 17 and the mold clamping cylinder 19 are controlled, the tie bar 15 is positioned at a fixed position with respect to the movable die plate 13 by the contact portion 41, so that the tie bar 15 is fastened surely and quickly in the molding cycle The mold thickness can be adjusted. As a result, for example, the degree of freedom in designing the stroke of the clamping cylinder and the expansion of the range of usable molds are realized. Furthermore, since the mold thickness adjustment is performed using the contact portion 41 and the mold clamping cylinder 19, the installation of new members and driving units is suppressed, and the mold thickness adjustment is realized with a simple configuration.

  The mold clamping device 3 has a tie bar pulling cylinder 43 that moves the tie bar 15 to the fixed die plate 11 side and pulls it from the moving die plate 13 in a state where the engagement by the moving side half nut 35 and the fixed side half nut 33 is released. Therefore, there is no need for a space for pulling out the tie bar 15 on the back side of the movable die plate 13 (the left side of the sheet surface of the movable die plate 13), and the entire die casting machine 1 can save space. That is, in this embodiment, since the injection device 5 is provided on the back side of the fixed die plate 11, even if the tie bar 15 is pulled out to the back side of the fixed die plate 11, it is dedicated to pulling out the tie bar 15. There is no need to provide space.

  In the mold clamping device 3, a plurality of tie bars 15 are provided, and the control device 7 sets the upper tie bar 15 </ b> U in a state in which the engagement by the moving half nut 35 and the fixed half nut 33 is released after the mold contact. The lower tie bar 15D is engaged with the moving half nut 35 and disengaged with the fixed half nut 33, and then the upper tie bar 15U is moved to the fixed die plate 11 side by the tie bar pulling cylinder 43. Since the moving side half nut 35, the fixed side half nut 33 and the mold opening / closing cylinder 17 are controlled so that the moving die plate 13 is moved in the mold opening direction by the mold opening / closing cylinder 17, the upper tie bar 15U is fixed On the back side of the plate 11, the lower tie bar 15D is a fixed die plate. Thus extending the first movable die plate 13 side. Therefore, the loads of the plurality of tie bars 15 are easily balanced with respect to the fixed die plate 11, and the fixed die plate 11 is difficult to fall.

  In the above embodiment, the die casting machine 1 is an example of the molding machine of the present invention, the mold opening / closing cylinder 17 is an example of the mold opening / closing drive part of the present invention, and the moving side half nut 35 is the moving side of the present invention. The member including the abutting portion 41 is an example of the engaging means, the abutting member of the present invention is an example, the mold clamping cylinder 19 is an example of the mold clamping driving unit of the present invention, and the piston of the mold clamping cylinder 19 is used. 31 is an example of the movable part of the present invention, the fixed side half nut 33 is an example of the fixed side engaging means of the present invention, and the tie bar pulling cylinder 43 is an example of the tie bar pulling driving part of the present invention.

  The present invention is not limited to the above embodiment, and may be implemented in various aspects.

  The molding machine is not limited to a die casting machine. For example, the molding machine may be another metal molding machine, a plastic injection molding machine, or a molding machine that molds a material obtained by mixing wood powder with a thermoplastic resin or the like. Good.

  The mold opening / closing drive section and the mold clamping drive section are not limited to hydraulic cylinders (hydraulic equipment). For example, a pneumatic cylinder (pneumatic device) may be used, or a hydraulic device and a pneumatic device may be appropriately combined.

  The number of tie bars is not limited to four. For example, it may be one, three, five or more. The engaged portion of the tie bar that is engaged by the fixed side engaging means or the moving side engaging means may not be provided at the end of the tie bar. For example, the fixed-side engaging means may be engaged in the middle of the tie bar as long as it can engage with the portion of the tie bar that is closer to the fixed die plate than the portion that engages with the moving die plate.

  Of the plurality of tie bars, the tie bar from which tie bars are removed is not limited to the upper tie bar. For example, the lower tie bar may be used, or all tie bars may be pulled out.

  The injection device is not limited to the one provided behind the fixed die plate. For example, the molding material (molten metal in the embodiment) may be supplied from below the mold. However, if the molding material is supplied from behind the fixed die plate as in the embodiment, it is necessary to newly provide a tie bar arrangement space even if the tie bar is pulled behind the fixed die plate as described above. There is no.

  In the embodiment, the case where the end of the tie bar 15 on the movable die plate 13 side is separated from the contact portion 41 in the initial state of the mold thickness adjustment is illustrated, but in the initial state of the mold thickness adjustment, the tie bar 15 The end of the movable die plate 13 may be in contact with the contact portion 41.

  In the embodiment, when preparing for mold thickness adjustment after mold replacement, the tie bar 15 is engaged by engaging the movable die plate 13 and the tie bar 15 until the movement of the movable die plate 13 in the mold opening direction. In the above example, the tie bar 15 may be engaged with the movable die plate 13 until the movable die plate 13 reaches the mold opening position, or the mold clamping cylinder 19 may be moved. Alternatively, the tie bar 15 may be moved toward the movable die plate 13 by the fixed-side half nut 33.

  In the embodiment, when the mold is closed in the molding cycle, the movement side half nut 35 is illustrated as being closed between the time when the abutting portion 41 abuts on the tie bar 15 and the time when the mold comes into contact. The contact portion 41 may be closed before the mold clamping is started after the contact with the tie bar 15, and may be closed after the mold contact, for example.

  In the embodiment, after the molded product is solidified, the mold clamping cylinder 19 moves the tie bar 15 to the moving die plate 13 side from the position when the mold contacts, and the position of the tie bar 15 in the mold open state of the molding cycle. By setting the position, the operation in which the contact portion 41 contacts the tie bar 15 before the mold contact when the mold is closed in the molding cycle is illustrated. However, after the molded product is solidified, the tie bar 15 may only be moved to the position at which the mold contacts. In this case, when the mold is closed in the molding cycle, the contact of the contact portion 41 with the tie bar 15 and the mold contact are performed simultaneously. In addition, after the molded product is solidified, the operation of moving the tie bar 15 to the moving die plate 13 side from the die contact position is performed by opening the moving die plate 13 by the die opening / closing cylinder 17 before opening the moving half nut 35. It may be realized by moving to a predetermined distance.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view including a cross-sectional view in a part showing a configuration of a die casting machine of an embodiment of the present invention in a mold open state. FIG. 2 is a front view including a cross-sectional view in a part showing the configuration of the die casting machine of FIG. 1 in a mold clamping state. FIG. 2 is a front view including a cross-sectional view of a part of the die casting machine of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Die casting machine (molding machine), 7 ... Control apparatus, 11 ... Fixed die plate, 13 ... Moving die plate, 15 ... Tie bar, 17 ... Mold opening / closing cylinder (mold opening / closing drive part), 19 ... Clamping cylinder (mold) Tightening drive part), 31 ... piston (movable part), 33 ... fixed half nut (fixed side engaging means), 35 ... moving side half nut (moving side engaging means), 41 ... contact part (contact member) ).

Claims (5)

A fixed die plate;
A movable die plate movable in a mold opening / closing direction with respect to the fixed die plate;
A tie bar hung on the fixed die plate and the movable die plate;
A mold opening / closing drive unit for driving the movable die plate in the mold opening / closing direction;
Moving-side engaging means capable of engaging or releasing the moving die plate and the tie bar;
A contact member fixed to the movable die plate and capable of contacting the end of the tie bar on the movable die plate side in a mold closing direction;
A mold clamping drive unit having a movable part that can be driven in the mold opening / closing direction with respect to the fixed die plate;
Fixed-side engaging means that is engaged with the movable part, and can engage or release the movable part and the tie bar by engaging or releasing the tie bar;
A control device for controlling the fixed side engaging means, the moving side engaging means, the mold opening / closing drive section, and the mold clamping drive section;
Have
The controller is
In mold thickness adjustment, the movable die plate is moved in the mold closing direction by the mold opening / closing drive unit in a state in which the engagement by the fixed side engaging means and the moving side engaging means is released, to the contact member. The abutting tie bar is moved together with the movable die plate in the mold closing direction, and after the mold contact, the fixed side engagement is achieved by driving the movable part to a position where the fixed side engagement means and the tie bar can engage with each other. Moving the coupling means, engaging the fixed side engaging means with the tie bar,
In the molding cycle, the movable die plate is closed by the mold opening / closing drive unit while maintaining the engagement by the fixed side engagement means in the mold thickness adjustment and releasing the engagement by the movement side engagement means. The tie bar and the movable die plate are engaged by the moving side engaging means, and the engagement and mold contact by the moving side engaging means are performed. After being made, the movable part is driven in the direction of extending the tie bar to perform mold clamping,
A mold clamping device that controls the fixed side engaging means, the moving side engaging means, the mold opening / closing drive section, and the mold clamping drive section. The tie bar pulling drive part which moves the tie bar to the fixed die plate side and pulls out from the moving die plate in a state where the engagement by the moving side engaging means and the fixed side engaging means is released. The mold clamping apparatus described. A plurality of the tie bars are provided,
The tie bar pulling drive unit is provided corresponding to at least a tie bar to be pulled out of the plurality of tie bars,
The controller controls the tie bar to be pulled out in a state where the tie bar to be pulled out after the mold contact is released by the moving side engaging means and the fixed side engaging means from the fixed die plate side. The tie bar which is moved by the tie bar pulling drive unit and the tie bar which is not pulled out of the plurality of tie bars is engaged by the moving side engaging means and the engagement by the fixed side engaging means is released. The mold clamping according to claim 2, wherein the moving side engagement means, the fixed side engagement means, and the mold opening / closing drive section are controlled so that the movable die plate is moved in the mold opening direction by the mold opening / closing drive section. apparatus. The mold clamping apparatus according to claim 2 or 3, wherein each of the mold opening / closing drive unit and the tie bar pulling drive unit includes at least one of a hydraulic device and a pneumatic device. A fixed die plate that holds the fixed mold;
A movable die plate that holds a movable mold and is movable in a mold opening / closing direction with respect to the fixed die plate;
A tie bar hung on the fixed die plate and the movable die plate;
A mold opening / closing drive unit for driving the movable die plate in the mold opening / closing direction;
Moving-side engaging means capable of engaging or releasing the moving die plate and the tie bar;
A contact member fixed to the movable die plate and capable of contacting the end of the tie bar on the movable die plate side in a mold closing direction;
A mold clamping drive unit having a movable part that can be driven in the mold opening / closing direction with respect to the fixed die plate;
Fixed-side engaging means that is engaged with the movable part, and can engage or release the movable part and the tie bar by engaging or releasing the tie bar;
A control device for controlling the fixed side engaging means, the moving side engaging means, the mold opening / closing drive section, and the mold clamping drive section;
An injection device provided on the opposite side of the fixed die plate to the movable die plate and capable of supplying a molding material to a cavity constituted by the fixed die and the movable die;
Have
The tie bar pulling drive unit is
A cylinder portion fixed to the fixed die plate;
A piston sliding in the cylinder part;
A rod fixed to the piston, extending from the cylinder part to the opposite side of the fixed die plate to the moving die plate, and connected to the tie bar;
A cylinder device having
The controller is
In mold thickness adjustment, the movable die plate is moved in the mold closing direction by the mold opening / closing drive unit in a state in which the engagement by the fixed side engaging means and the moving side engaging means is released, to the contact member. The abutting tie bar is moved together with the movable die plate in the mold closing direction, and after the mold contact, the fixed side engagement is achieved by driving the movable part to a position where the fixed side engagement means and the tie bar can engage with each other. Moving the coupling means, engaging the fixed side engaging means with the tie bar,
In the molding cycle, the movable die plate is closed by the mold opening / closing drive unit while maintaining the engagement by the fixed side engagement means in the mold thickness adjustment and releasing the engagement by the movement side engagement means. The tie bar and the movable die plate are engaged by the moving side engaging means, and the engagement and mold contact by the moving side engaging means are performed. After being made, the movable part is driven in the direction of extending the tie bar to perform mold clamping,
A molding machine that controls the fixed side engaging means, the moving side engaging means, the mold opening / closing drive section, and the mold clamping drive section.

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