JP2018158343A - Mold clamper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold clamper allowing for positively operating a tie-bar fixing device even if an eccentricity of the tie-bar occurs in a radial direction of the tie-bar with respect to a metal mold attachment plate due to a deformation of the metal mold attachment plate.SOLUTION: A mold clamper 1 comprises a tie-bar fixing device 26 that is arranged in a metal-mold attachment plate (movable plate 23) and capable of inhibiting/canceling a tie-bar 22 from axially moving as desired with respect to the metal-mold attachment plate (movable plate 23) by two engagement members 26a, 26b configured to move closer to and away from each other in one radial direction of the tie-bar 22 with respect to a sectional center of the tie-bar 22 penetrating through the metal-mold attachment plate (movable plate 23). One direction of the tie-bar fixing device 26 in which the engagement members 26a, 26b move closer to and away from each other is aligned with an eccentricity of the tie-bar 22 in a radial direction of the tie-bar 22 with respect to the metal-mold attachment plate (movable plate 23) occurring due to a deformation of the metal-mold attachment plate (movable plate 21).SELECTED DRAWING: Figure 4

Description

  According to the present invention, two latches arranged on a mold mounting plate and configured to be close to and away from each other in one radial direction of the tie bar with respect to the cross-sectional center of the tie bar passing through the mold mounting plate. The present invention relates to a mold clamping device including a tie bar fixing device capable of arbitrarily suppressing and releasing movement of a tie bar in an axial direction with respect to a mold mounting plate by a member.

  Die-casting machines and injection molding machines have molten aluminum in a mold cavity (a space including the product shape) formed between these two molds when the fixed mold and the movable mold are closed (clamped state). An injection device for filling (melt) or resin, and a mold clamping device for approaching / separating (opening / closing) and clamping the movable mold attached to the movable plate with respect to the fixed die attached to the fixed plate, Consists of As such a mold clamping device, a toggle type mold clamping device and a direct pressure type mold clamping device are mainly known.

  The former toggle type mold clamping device is a mold clamping device that drives a toggle link mechanism using a hydraulic actuator (cylinder) or a servo motor as a drive source, and moves the crosshead in the mold opening and closing direction by the drive source. The toggle link linked to the crosshead is bent and extended, and the movable mold is opened / closed and clamped with respect to the fixed mold. At this time, mold opening / closing and mold clamping can be performed by one drive source, and a desired mold clamping force can be obtained by a smaller driving force (output) (link boost characteristic). In the state where the maximum mold clamping force can be obtained and the toggle link is fully extended (locking state), there is an advantage that it is not necessary to maintain the output of the drive source to maintain this.

  In such a toggle type mold clamping device, a toggle link between the fixed platen (die mounting plate), the movable platen (die mounting plate) and the movable platen is provided in order to facilitate maintenance and die replacement. When a tie bar removing device is provided that can pull out some of the tie bars in the axial direction (generally in the direction away from the pressure receiving plate) among the plurality of tie bars that pass through the pressure receiving plate (link housing) connected by the mechanism. There is. In the tie bar removal device, the fixed plate and tie bar are fixed nuts, and the pressure receiving plate and tie bar are movable nuts to prevent relative movement of each tie bar in the axial direction. The tie bars are separated from the pressure receiving plate together with the movable nuts. A tie bar fixing device is provided on the side of the fixing nut so that the movement of the tie bar in the axial direction relative to the fixed plate can be arbitrarily suppressed and released.

  The latter direct pressure type mold clamping apparatus is configured as a mechanism in which a mold opening / closing mechanism for opening and closing a movable mold and a mold clamping mechanism for clamping a mold are different from a fixed mold, and each includes a drive source. There are two types according to the structure of the mold clamping mechanism. One is that instead of the toggle link mechanism of the former toggle type mold clamping device, a pressing means such as a ram cylinder using hydraulic pressure as a driving source is arranged, and is fixed relative to the tie bar in the axial direction. The movable plate is pressed toward the fixed plate by the pressing means between the plate and the pressure receiving plate, and the movable die is clamped against the fixed die.

  In such a direct pressure type mold clamping device, a tie bar removing device may be provided, and in that case, a tie bar fixing device is generally provided on the fixing nut side in the same manner as the toggle type mold clamping device.

  Another direct pressure type mold clamping device is composed of two mold mounting plates, a fixed platen and a movable platen, and the movable die is in contact with the fixed die (die touch) or in contact (die touch). In a state of being stopped just before the tie bar, the tie bar is extended by a mold clamping mechanism arranged for each tie bar penetrating the two mold mounting plates, and the movable mold is clamped with respect to the fixed mold.

  In such a direct pressure type mold clamping device, the movable platen is lowered by the tie bar fixing device arranged on the movable platen side in a state where the inhibition of the movement of the tie bar in the axial direction with respect to the movable platen is released and moved to the fixed die. After stopping the mold just before touching the mold or touching the mold, the tie bar is extended by the clamping mechanism arranged for each tie bar from the state where the tie bar fixing device prevents the tie bar from moving in the axial direction. (When stopped just before the mold is touched, the tie bar is stretched as it is after the mold is touched by the mold clamping mechanism), and the movable mold is clamped against the fixed mold. The mold clamping mechanism arranged for each tie bar may be arranged on either the fixed platen or the movable platen, and the mold clamping mechanism may be arranged on the movable platen together with the tie bar fixing device.

  In this way, an example in which the mold clamping mechanism is arranged for each tie bar among the direct pressure type mold clamping apparatuses roughly classified into two according to the configuration of the mold clamping mechanism is the mold clamping apparatus of the die casting machine of Patent Document 1. . The die-casting machine clamping device disclosed in Patent Document 1 is a tie bar comprising a pair of half nuts and a half nut gripping means for gripping a multiple groove formed on the outer periphery of the tie bar, the mold opening and closing direction being horizontal. The locking device, that is, the two tie members configured to be able to approach and separate from each other in the radial direction of the tie bar with respect to the cross-sectional center of the tie bar, allows the tie bar to move in the axial direction with respect to the mold mounting plate. This is a mold clamping device including a tie bar fixing device that can be arbitrarily suppressed and released.

  An example of a mold clamping device whose mold opening / closing direction is vertical is a mold clamping device of a vertical casting apparatus of Patent Document 2. A general vertical casting apparatus fills molten metal from below a mold cavity formed in a clamped lower mold (fixed mold) and an upper mold (movable mold). A mold injection device for the squeeze casting method (molten forging method) and a stalk (molten supply member) equipped with a vertical injection device by filling the mold cavity with a molten metal injection device at low speed and high pressure. The molten metal is directly charged at low speed and low pressure by gas pressure from a holding furnace or crucible placed below the lower mold mounting plate (fixed plate) to which the lower die is attached. A vertical casting apparatus for a low pressure casting method is known.

  The vertical casting apparatus of Patent Document 2 is a vertical casting apparatus for the latter low pressure casting method, and the filling pressure of the molten metal into the mold cavity is generally smaller than that of a die casting machine or a squeeze machine. Therefore, the mold opening / closing mechanism functions as a mold clamping mechanism when the mold opening force caused by the filling pressure can be resisted by the mold clamping force generated by the driving means of the mold opening / closing mechanism. On the other hand, when the lower mold gate (molten inlet) is closed after the mold cavity is filled with the molten metal and the pressure is applied directly to the molten metal with a pressure member such as a pressure pin, the mold opening force due to the same pressure In order to resist this, a mold clamping mechanism as provided in the mold clamping device of the die casting machine of Patent Document 1 is arranged.

Japanese Patent Laid-Open No. 08-117959 JP 2017-030036 A

  In the vertical casting apparatus for the squeeze casting method and the low pressure casting method, high-temperature molten metal is charged into the mold cavity at a low speed from the lower mold gate of the mold in the mold-clamped state. Since the mold cavity is gradually filled with high-temperature molten metal from the lower mold side, the lower mold and lower mold are attached with a longer residence time of the molten metal than the upper mold and the movable plate to which the upper mold is mounted. The fixed plate is heated longer. The fixed plate to which the lower mold is attached is docked to the lower mold of the sleeve at the tip of the injection device (squeeze casting method) and the molten metal supply member (Stoke) on the upper surface side where the continuous mold mounting surface is formed. A large opening (concave portion) is formed on the lower surface side for connection to the lower die (low pressure casting method). For this reason, in the stationary platen to which the lower mold is attached, the amount of thermal expansion in the horizontal direction on the upper surface (die mounting surface) side of the continuous stationary plate is larger than the amount of thermal expansion on the lower surface side that is discontinuous due to the formation of the opening. As a result, the fixed platen is curved and deformed so that the central portion protrudes upward.

  The bending deformation of the fixed plate of the vertical casting apparatus as described above becomes more conspicuous in the vertical casting apparatus for the low pressure casting method in which the holding furnace and the crucible are arranged directly below the fixed plate. In the squeeze casting method, molten metal is supplied from the holding furnace or crucible outside the casting apparatus into the sleeve of the injection apparatus by a hot water supply apparatus or the like, and then filling of the molten metal into the mold cavity is started by the injection apparatus. On the other hand, in the low pressure casting method, a holding furnace and a crucible are arranged directly below the fixed platen, and the molten metal is filled directly into the mold cavity via the molten metal supply member (Stoke) without touching the outside air. This is because the molten metal having a higher temperature than that of the squeeze casting method is filled. Filling the molten metal at a higher temperature further increases the amount of thermal expansion in the horizontal direction on the upper surface side of the stationary platen.

  Further, with the bending deformation of the stationary platen as described above, the tie bars that are erected through the four corners of the stationary platen also try to move in the direction in which the distance on the upper end side of each tie bar increases (opens). . That is, due to the deformation of the fixed platen (die mounting plate), the tie bar is decentered in the radial direction with respect to the movable platen (die mounting plate). Specifically, since each tie bar is passed through the four corners of the movable plate via the tie bar bush, at least the gap for sliding between the tie bar and the tie bar bush, the eccentricity in the radial direction of each tie bar is The direction of the eccentricity is allowed and substantially coincides with the diagonal direction of the movable platen.

  When the tie bar fixing device is arranged on the movable plate of a general vertical casting apparatus, the approaching / separating direction of the two locking members of the tie bar fixing device is parallel to each side (side surface) of the movable plate. Placed on the movable board. Therefore, the eccentricity of the tie bar as described above is intended to act in the eccentric direction of the tie bar (the diagonal direction of the movable platen) different from the approaching / separating direction of the two locking members of the tie bar fixing device at the time of clamping. Do not generate a load. As a result, there is a problem that this unintended load is continuously applied to the sliding portions of the two locking members of the tie bar fixing device during mold clamping.

  In addition, in order to release the mold clamping state by the eccentricity of the tie bar as described above, and to separate the upper mold from the lower mold (mold opening / raising) by the mold opening / closing mechanism, the two locks of the tie bar fixing device Even when the member is separated from the center of the cross section of the tie bar, there arises a problem that the two locking members must be separated in a state in which a load in a direction different from the separating direction is applied. Further, if continuous bending of the vertical casting apparatus as described above causes constant deformation of the fixed plate and movement of the upper end side of the tie bar (ie, eccentricity of the tie bar), the upper mold is opened by the mold opening / closing mechanism. When the two locking members of the tie bar fixing device are brought into contact with the lower mold after being brought into contact with the lower mold (the mold touch), the two locking members must be brought close to each other in the same state. The problem of having to occur arises.

  As described above, the two engagement members arranged on the movable platen (die mounting plate) and configured to be able to approach and separate from each other in one radial direction of the tie bar with respect to the cross-sectional center of the tie bar passing through the movable platen. Clamping device equipped with a tie bar fixing device that can arbitrarily prevent or release the movement of the tie bar in the axial direction with respect to the movable platen by the stop member, in particular, the vertical mold clamping employed in the vertical casting apparatus for the low pressure casting method In the device, when the tie bar fixing device is operated, the locking members of the device approach and separate from each other (direction parallel to each side (side surface) of the movable plate) and the eccentric direction of the tie bar as described above. (Diagonal direction of the movable platen), the load in a direction different from the direction in which sliding is allowed in the structure in which these two locking members are approached / separated is the operation of the tie bar fixing device related to mold clamping・ During release and mold clamping, There is a problem that is granted continued, and deformation and uneven wear of the sliding parts of the structure to be close to or away from the two locking members, or malfunction there is a risk that occurs due to this.

The present invention has been made in view of the above problems, and is disposed on a mold mounting board.
With respect to the cross-sectional center of the tie bar that penetrates the mold mounting plate, two locking members configured to be able to approach and separate from each other in one radial direction of the tie bar, the axial direction of the tie bar with respect to the mold mounting plate In a mold clamping device equipped with a tie bar fixing device that can arbitrarily deter / release movement, even if the tie bar is decentered in the radial direction with respect to the mold mounting plate due to deformation of the mold mounting plate Another object of the present invention is to provide a mold clamping device that reliably operates a tie bar fixing device.

The mold clamping device according to the present invention is disposed on a mold mounting board,
The tie bar with respect to the mold mounting plate by two locking members configured to be able to approach and separate from each other in one radial direction of the tie bar with respect to the cross-sectional center of the tie bar passing through the mold mounting plate. Equipped with a tie bar fixing device that can arbitrarily deter / release movement in the axial direction of
The one direction in which the locking members of the tie bar fixing device approach and separate from each other is generated by deformation of the mold mounting plate, and the tie bar in the radial direction of the tie bar with respect to the mold mounting plate. It is made to correspond with the direction of eccentricity.

  In the mold clamping device according to the present invention, the direction of the eccentricity of the tie bar may coincide with the diagonal direction of the mold mounting board.

On the other hand, the mold clamping device according to the present invention is a mold in which the mold clamping device is concentric with the tie bar and is disposed in a through portion of the tie bar of the mold mounting plate or a portion continuous with the through portion. A clamping mechanism comprising a clamping piston and oil chambers formed at both ends of the clamping piston in the axial direction of the tie bar;
The tie bar fixing device may be fixed to one end of the mold clamping piston in the axial direction of the tie bar.

In the mold clamping device according to the present invention, the mold clamping device is integrally formed with the tie bar at a penetrating portion of the tie bar of one of the mold mounting plates or a portion continuous with the penetrating portion. A mold clamping mechanism composed of a mold clamping piston and oil chambers formed at both ends of the mold clamping piston in the axial direction of the tie bar;
The tie bar fixing device may be disposed on the other mold mounting plate.

  The mold clamping device according to the present invention is configured such that a tie bar bush disposed in a through portion of the tie bar of the mold mounting plate allows a predetermined amount of eccentricity in the radial direction of the tie bar. May be.

  According to the present invention, there is provided a mold clamping device that reliably operates a tie bar fixing device even if the tie bar is eccentric in the radial direction of the tie bar due to deformation of the mold mounting plate. can do.

1 is a schematic side view of a vertical casting apparatus according to an embodiment of the present invention. It is A arrow directional view of FIG. It is an image figure which shows the curved deformation (side surface) of the stationary platen of the vertical casting apparatus which concerns on this embodiment. FIG. 4 is a view taken in the direction of arrow B in FIG. 3. FIG. 2 is a detailed view of a main part X in FIG. 1. It is a figure explaining the approach of the securing member of the tie bar fixing device in the C arrow view of FIG. It is a figure explaining separation of the locking member of the tie bar fixing device in the direction of arrow C in FIG. It is a schematic sectional side view of the tie bar bush attachment structure of the vertical casting apparatus which concerns on another embodiment of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. The following embodiments do not limit the invention according to each claim, and all combinations of features described in the embodiments are not necessarily essential to the solution means of the invention. .

  A vertical casting apparatus 1 according to the present embodiment will be described with reference to FIGS. 1, 2 and 5 to 7.

  First, the configuration of the vertical casting apparatus 1 according to the present embodiment will be described with reference to FIGS. 1 and 2. The vertical casting apparatus 1 shown in FIG. 1 is in a mold open state. The lower mold 11 is attached to a mold mounting surface on the upper surface of the fixed platen 21, and four tie bars 22 are erected through the four corners of the fixed platen 21. Above the fixed platen 21, the upper die 12 is mounted on the die mounting surface on the lower surface of the movable platen 23 so as to be guided up and down by the four tie bars 22 and facing the lower die 11. Between the fixed platen 21 and the movable platen 23, an elevator actuator 24 as a mold opening / closing mechanism for moving the movable platen 23 up and down relative to the fixed platen 21 is disposed. Note that the movable platen 23 and the upper die 12 in the mold closed (clamped) state in which the movable platen 23 is lowered with respect to the fixed platen 21 are shown by two-dot chain lines in FIG.

  2 is a view as seen from the direction of arrow A in FIG. 1, that is, a plan view. The lower mold 11 is fixed to the approximate center of the substantially square fixed platen 21. A mold cavity that is visible from the mold dividing surface of the lower mold 11 is not shown. The four tie bars 22 penetrate the fixed platen 21 at substantially equal distances from the four corners of the substantially square fixed platen 21, that is, on the diagonal line of the fixed platen 21. Further, the raising / lowering actuators 24 as the mold opening / closing mechanisms are respectively disposed in the vicinity of the outer sides of the four tie bars 22. Moreover, the foundation member 31 mentioned later and a part of holding furnace 41 are shown in figure. Although illustration on a plane is omitted, there is a positional relationship between the upper mold 12 and the movable plate 23 corresponding to the lower mold 11 and the fixed plate 21, the four tie bars 22 and the lifting actuator 24. Needless to say, the positional relationship is the same as those of the lower mold 11 and the fixed platen 21.

  Here, the vertical casting apparatus 1 according to the present embodiment is a vertical casting apparatus for a low pressure casting method, but after filling the mold cavity with the molten metal, the mold gate (molten inlet) is closed, It is assumed that a structure (not shown) for directly applying pressure to the molten metal by a pressure member such as a pressure pin is provided. For this reason, a portion (upper side) continuous with the penetrating portion of the tie bar 22 on the upper surface of the movable platen 23 is provided with a mold clamping mechanism 25 arranged concentrically with the tie bar 22 and the axial direction of the tie bar 22 of the mold clamping mechanism 25. A tie bar fixing device 26 is fixed to one end (upper end) of the head. The mold clamping mechanism 25 and the tie bar fixing device 26 are schematically shown in FIG. 1, and the details are shown in FIG.

  First, the mold clamping mechanism 25 will be described with reference to FIG. The mold clamping mechanism 25 includes a mold clamping piston 25 a that is arranged concentrically with the tie bar 22 for each tie bar 22, a mold clamping piston body 25 b that slidably houses in the axial direction of the tie bar 22, and a mold clamping piston body. And an oil chamber formed at both ends of the mold clamping piston 25a in the axial direction of the tie bar 22 in the mold 25b. The lower oil chamber is a mold clamping oil chamber 25c to which pressure oil is supplied from a connected hydraulic pipe (not shown) at the time of mold clamping, and the upper oil chamber is the mold clamping when the mold clamping is released. This is a release operating oil chamber 25d in which hydraulic fluid is sucked from a connected hydraulic pipe (not shown) by lowering of the piston 25a.

Next, the tie bar fixing device 26 will be described with reference to FIG. The tie bar fixing device 26 in the present embodiment is a split nut mechanism that is also adopted as a fixing nut of a tie bar removing mechanism such as a horizontal casting apparatus (die casting machine). A ring-shaped uneven portion (not shown) is processed on the outer peripheral surface of the tie bar 22 that matches the mold thickness adjustable range of the movable platen 23, and this split nut mechanism has the same ring-shaped uneven portion that meshes with the ring-shaped uneven portion. The locking member 26a, 26b (referred to as a nut body, a half nut, etc.) that is processed into its inner peripheral surface (not shown) and divided into two in the axial direction of the tie bar 22, and the locking member 26a , 26b, and a driving means 26c such as a hydraulic actuator (cylinder) for driving the basic configuration. Note that “the outer peripheral surface of the tie bar 22 that coincides with the mold thickness adjustable range of the movable platen 23” means that when a mold having a minimum mold thickness to a maximum mold thickness is mounted according to the specifications of the vertical casting apparatus 1. In addition, the ring-shaped uneven portions of the locking members 26a, 26b of the tie bar fixing device 26 can be engaged with the ring-shaped uneven portions of the tie bar 22 in a state where the molds are in contact (die touch). It is the outer peripheral surface of the tie bar 22 by which the uneven | corrugated part was processed.

  Here, the details of the configuration of the tie bar fixing device 26 and the operation of the locking members 26a and 26b will be described with reference to FIGS. 6 and 7 are views taken in the direction of arrow C in FIG. 5, and the illustration of the configuration is simplified for explaining the operation. In FIG. 5, the locking members 26 a and 26 b are separated from each other, that is, the state in which the suppression of the movement of the tie bar 22 in the axial direction with respect to the movable platen 23 is released. This corresponds to FIGS. 6A and 7C.

  The two locking members 26a and 26b restrain the movement of the respective locking members in the vertical direction in FIG. 5 (the axial direction of the tie bar 22) and the vertical direction in FIG. 6 (FIG. 7) (the radius of the tie bar 22). Is housed in a base portion 26d that allows only a predetermined distance of movement in one direction). The base portion 26d is fixed to one end (upper end) of the mold clamping piston 25a in the axial direction of the tie bar 22. In FIG. 6 (FIG. 7), only a part of the base portion 26d is shown, and the oblique line in the vicinity of the base portion 26d in FIG. 6A indicates that only the base portion 26d is one end (upper end) of the mold clamping piston 25a. Indicates that it is fixed.

  Of the two locking members, the locking member 26a on the drive means 26c side is connected to the drive rod of the drive means 26c. Further, the locking member 26a (main body / drive rod side) and the other locking member 26b are connected by two guide rods 26e penetrating (broken lines) through the locking member 26a. Black circles in FIG. 6 (FIG. 7) indicate that the drive rod and guide rod 26e of the drive means 26c are fixed to other configurations. In such a configuration, as shown in FIG. 6A, the locking members 26a and 26b are separated from each other by a distance d from the center of the tie bar 22 in one radial direction. Is constrained by the base portion 26d. The distance d is a distance at which a safe clearance is secured so that the tie bar 22 and the locking members 26a and 26b do not interfere when the movable platen 23 is moved (lifted).

  Here, as described above, only the base portion 26d of the tie bar fixing device 26 is fixed to one end (upper end) of the mold clamping piston 25a. In FIG. Is only in contact with the base portion 26d. In this state, the movable platen 23 is lowered, the upper die 12 is brought into contact with the lower die 11 (die touch), and the lowering of the movable platen 23 is stopped. Then, when the pressure oil P is supplied to the head side of the driving means 26c, as shown in FIG. 6B, the movement in the separating direction does not move the locking member 26b restrained by the base portion 26d. First, only the locking member 26a fixed to the drive rod of the drive means 26c is guided by the base portion 26d and the guide rod 26e, approaches the tie bar 22 (the center of the cross section thereof), and is processed into the outer peripheral surface of the tie bar 22. Engages with ring-shaped irregularities.

  In addition, by controlling the amount of pressure oil and the pressure oil pressure supplied to the two oil chambers (the mold clamping oil chamber 25c and the mold release operating oil chamber 25d) described above, one end (upper end) of the mold clamping piston 25a is controlled. Fine adjustment of the vertical position of the fixed tie bar fixing device 26 with respect to the movable platen 23 is possible. Therefore, as described above, in the mold touch state of the mold to be used, the movable platen 23 is lowered so that the locking members 26a and 26b approaching the tie bar 22 and the ring-shaped uneven portions of the tie bar 22 are accurately meshed with each other. Before or during the start, the vertical position of the tie bar fixing device 26 with respect to the movable plate 23 is adjusted by adjusting the vertical position of the mold clamping piston 25a with respect to the movable plate 23. The outer peripheral surface of the tie bar 22 and the inner peripheral surfaces of the locking members 26a and 26b may adopt a form in which a general screw portion is processed instead of the ring-shaped uneven portion.

  The mold opening / closing mechanism does not require a large driving force as long as the movable plate and the upper mold (movable mold) can be moved at a desired speed in the mold opening / closing direction. Therefore, in consideration of the case where a cast product is burned into the mold and a large mold opening force is required, the upper mold (movable mold) is completely transferred from the lower mold (fixed mold) to the upper mold (movable mold) from the mold clamping state to the mold touch state. ) Until the mold is released, while the tie bar fixing device 26 is operated and the axial movement of the tie bar 22 relative to the movable platen 23 can be reliably suppressed, the pressure oil is supplied to the mold release operating oil chamber 25d of the mold clamping mechanism 25. To forcibly separate the upper mold (movable mold) from the lower mold (fixed mold).

  If the supply of the pressure oil P to the head side of the drive means 26c is continued from the state of FIG. 6B, the drive means 26c in which the forward movement of the drive head is suppressed by the tie bar 22 via the locking member 26a. The drive means 26c itself moves in a direction away from the base portion 26d. Accordingly, the locking member 26b connected to the driving means 26c by the guide rod 26e is guided by the base portion 26d and approaches the tie bar 22. Then, the locking member 26 b meshes with the ring-shaped uneven portion processed on the outer peripheral surface of the tie bar 22. At this time, the drive means 26c is prevented from further separation at a position away from the base portion 26d by the distance d. In this way, the force according to the pressure of the pressure oil P supplied to the head side of the driving means 26c is pressed and integrated in one direction toward the center of the cross section of the tie bar 22 so that the two locking members face each other. Thus, the axial movement of the tie bar 22 with respect to the movable platen 23 can be reliably prevented. Depending on the configuration of the tie bar fixing device 26 (the driving means 26c is not fixed to the base portion 26d), a complicated link mechanism or the like is arranged, or a driving source is arranged for each locking member, and these are controlled synchronously. The pressing force of each of the two locking members 26a and 26b toward the center of the cross section of the tie bar 22 can be evenly opposed in one radial direction of the tie bar 22.

  Thereafter, when pressure oil is supplied to the mold clamping chamber 25c of the mold clamping mechanism 25 and the tie bar 22 is expanded, the lower mold 11 and the upper mold 12 are set with the reaction force of the elastic force corresponding to the extension amount as the mold clamping force. Can be given. When the casting is completed and the pressure oil pressure in the mold clamping chamber 25c of the mold clamping mechanism 25 is released, the mold clamping force is also released, and the length of the tie bar 22 is restored. After that, when the pressure oil P is supplied from the state of FIG. 7A to the drive rod side of the drive means 26c as shown in FIG. 7B, the locking member 26a (FIG. 7B) follows. The locking members 26b (FIG. 7C) are separated from each other and are in the same state as FIG. 6A. As shown in FIG. 7C, when the supply of the pressure oil to the drive rod side of the drive means 26c is continued, the two locking members are moved from the center of the cross section of the tie bar 22 by the force according to the pressure of the pressure oil. Each of the distances d can be maintained. Even in this state, the separation force of the two locking members 26 a and 26 b from the center of the cross section of the tie bar 22 can be applied evenly in one radial direction of the tie bar 22.

  In this embodiment, the upper die 12 is brought into contact with the lower die 11 (die touch) to stop the lowering of the movable platen 23. However, the upper die 12 is brought into contact with the lower die 11 (die touch). There is a case where the descent of the movable platen 23 is stopped immediately before the movement. For example, in mold clamping control, the mold touch state is determined by bringing the upper mold (movable mold) into contact with the lower mold (fixed mold) (mold touch) and then a predetermined mold clamping force (less than the regular mold clamping force). In some cases, the state in which the occurrence of the phenomenon occurs is defined as a type touch state. As described above, in the mold clamping device including the die casting machine of Patent Document 1 that performs the mold opening / closing operation by the mold opening / closing mechanism, in particular, the mold clamping device in which the mold opening / closing direction is vertical, the driving force of the mold opening / closing mechanism is as described above. Is often small. In such a case, the tie bar fixing device 26 is operated on the upper die (movable die) that is stopped immediately before the lower die (fixed die) comes into contact (die touch), and the axis of the tie bar 22 relative to the movable platen 23 is operated. After making the state in which the movement in the direction can be surely suppressed, pressure oil is supplied to the mold clamping oil chamber 25c of the mold clamping mechanism 25, and the upper mold (movable mold) is moved and brought into contact with the lower mold (fixed mold) ( The mold is touched), and the tie bar 22 is stretched as it is to generate a normal mold clamping force.

  Finally, as shown in FIG. 5, a tie bar bush 27 is disposed in the penetrating portion of the tie bar 22 of the movable platen 23 to prevent the tie bar from being worn or damaged due to the lifting / lowering operation of the movable platen 23. However, as described above, there is a gap for sliding (sliding gap) between the tie bar 22 and the tie bar bush 27, and this sliding gap is equivalent to the movable platen 23 (die mounting plate). Due to the deformation, eccentricity of each tie bar 22 in the radial direction occurs.

  Returning to the description of the vertical casting apparatus 1 shown in FIG. A fixing nut 28 that suppresses the downward movement of the fixed platen 21 is disposed in a portion of the lower surface of the fixed platen 21 that penetrates the tie bar 22. The fixing nut 28 is a general fixing nut in a horizontal casting apparatus (die casting machine) or the like, and is screwed to the inner peripheral surface of the male screw portion (not shown) processed on the outer peripheral surface of the lower end of the tie bar 22. A female screw portion (not shown) is processed and screwed into the lower end of the tie bar 22 to enlarge the outer diameter of the lower end. A detent (not shown) is provided between the tie bar 22 and the fixed nut 28, the relative rotational movement of the fixed nut 28 and the tie bar 22 is suppressed, and the downward movement of the fixed platen 21 is reliably suppressed. . On the other hand, since the fixing nut 28 is not fixed to the lower surface of the fixed platen 21, the rotational movement about the axial direction of the tie bar 22 with respect to the fixed platen 21 is not restricted.

  The fixing nut 28, that is, the lower end side of the tie bar 22 is connected to the base member 31. The base member 31 is a gantry structure assembled by welding, bolting, or the like using structural steel such as H steel, and the holding furnace 41 is stored below the fixed platen 21 by such a gantry structure. It is preferable to secure the space to be used. By forming the space for storing the holding furnace 41 in this way, the storable width when storing the holding furnace 41 is not limited by the distance between the outer peripheral surfaces of adjacent tie bars 22, and in the unlikely event the tie bar 22 is When exchanging, the total length of the tie bar 22 is short, which is convenient when the tie bar 22 is pulled out in any of its axial directions.

  In the base member 31, the molten metal supply part 41 a of the holding furnace 41 is accommodated, and the upper end of the molten metal supply member 41 b (Stoke) erected upward from the molten metal supply part 41 a passes through the opening 21 a of the stationary platen 21. , Is connected to the gate of the fixed mold 11 (melt inlet / not shown). A mold cavity (not shown) is formed between the lower mold 11 and the upper mold 12 to which a mold clamping force is applied by the mold clamping mechanism 25, and the mold cavity communicates with the gate of the lower mold 11. ing. Then, an inert gas supply device (not shown) is inserted into the space of a molten metal holding chamber (not shown) in the molten metal supply portion 41a of the holding furnace 41 where the molten metal is held and has an airtightness. When the active gas or the like is supplied at a predetermined pressure, the molten metal surface in the molten metal holding chamber is pressurized. As a result, the molten metal surface height is lowered, and the lower end of the molten metal is immersed in the molten metal (not shown) via the molten metal supply member 41b. It can be fed into the cavity. In the vertical casting apparatus 1, casting is performed in this way.

  By the way, in the vertical casting apparatus for the squeeze casting method and the low pressure casting method, when the molten metal is filled into the mold cavity, that is, the tie bar fixing device 26 is operated to move the tie bar 22 in the axial direction relative to the movable platen 23. In a state where pressure oil is supplied to the mold clamping chamber 25c of the mold clamping mechanism 25 and the tie bar 22 is extended to apply a mold clamping force to the lower mold 11 and the upper mold 12, As described above, when the molten metal is filled into the mold cavity, the horizontal thermal expansion amount on the upper surface (die mounting surface) side of the continuous stationary platen is discontinuous due to the formation of the opening 21a. Therefore, the fixed platen 21 is curved and deformed so that the central portion protrudes upward, and accordingly, the fixed plate 21 and the movable plate 23 are erected through the four corners of the fixed plate 21 and the movable plate 23. Even each Distance upper side of Iba 22 increases (open) tries to move in the direction. This is shown in FIG. In order to make the drawing easy to understand, the curved deformation of the fixed platen 21 and the movement of the upper end side of the tie bar 22 are exaggerated.

  In such a state, as shown in the upper left and lower right of FIG. 4 as viewed in the direction of arrow B in FIG. 3, the sliding gap between the tie bar 22 and the tie bar bush 27 and the radial deviation of each tie bar 22. The core 22 ′ (two-dot chain line) is allowed, and the direction of the eccentricity (arrow D) substantially coincides with the diagonal direction of the fixed platen 21 and the movable platen 23. 4 is a plan view of the fixed platen 21 as viewed from the direction indicated by the arrow B in FIG. 3. The radial eccentricity 22 ′ (two-dot chain line) of each tie bar 22 is a plan view of the movable platen 23. It occurs in the same way.

  In this case, it is assumed that the tie bar fixing device 26 is arranged in a portion (upward) continuous with the penetrating portion of the tie bar 22 of the movable plate 23 in the same manner as a general tie bar fixing device. This is shown as the arrangement Y on the lower left side of FIG. In the arrangement Y, the tie bar fixing device 26 is arranged so that the approaching / separating direction (arrow Y1) of the two locking members 26a and 26b is substantially parallel to each side (side surface) of the movable platen. . As shown in the arrangement Y, an unintended load acting in a direction (arrow D) different from the direction allowing the sliding (arrow Y1) in the structure in which the two locking members 26a and 26b are approached / separated is fixed to the tie bar. It will continue to be applied to the sliding portions of the two locking members of the device 26 during mold clamping.

  Further, the mold clamping state is released by the eccentricity of the tie bar 22 in the radial direction as described above, and the movable mold 12 is separated from the fixed mold 11 by the lifting / lowering actuator 24 which is a mold opening / closing mechanism (mold opening / raising). Therefore, when the two locking members 26a and 26b of the tie bar fixing device 26 are separated from the center of the cross section of the tie bar 22, a load in a direction (arrow D) different from the direction of separation (arrow Y1) acts. Must be separated in the same state. Further, if continuous casting of the vertical casting apparatus 1 causes the bending deformation of the stationary platen 21 and the movement of the upper end side of the tie bar 22 (eccentricity of the tie bar 22) as shown in FIG. A similar state occurs when the two locking members of the tie bar fixing device 26 are brought close to the center of the cross section of the tie bar 22 after the movable mold 12 is brought into contact (die touch) with the actuator 24 by the actuator 24. The two locking members must be brought close together.

  Thus, in the case of the arrangement Y of a general tie bar fixing device, a sliding portion having a structure for approaching / separating the two locking members 26a, 26b of the tie bar fixing device 26, for example, a sliding portion in the driving means 26c, Deformation and partial wear of the guide rod 26e, the through-hole of the locking member 26a through which the guide rod 26e passes and the contact surfaces of the two locking members 26a, 26b and the base portion 26d, or malfunction caused by this May occur. As a result, the operation of the tie bar fixing device 26 may become uncertain.

  On the other hand, in the vertical casting apparatus 1 according to the present application, the tie bar fixing device 26 is configured such that the approaching / separating direction (arrow Z1) of the two locking members 26a, 26b is shifted in the radial direction of the tie bar 22. It arrange | positions so that it may correspond with the direction (arrow D) of a core. This is shown as an arrangement Z in the upper right of FIG. As shown in the arrangement Z, the load in the direction (arrow D) substantially the same as the direction allowing the sliding (arrow Z1) in the structure in which the two locking members 26a and 26b are approached / separated continues during mold clamping. However, since the direction (arrow D) coincides (parallel) with the direction (arrow Z1) that allows sliding, the structure is such that the two locking members 26a and 26b are approached and separated. There is little risk of deformation or partial wear of the sliding portion mentioned above, and the tie bar fixing device 26 can be operated reliably.

  Further, when the eccentricity of the tie bar as described above releases the mold clamping state and separates the two locking members 26 a and 26 b from the center of the cross section of the tie bar 22, the movable mold 12 is changed to the fixed mold 11. When the two locking members 26a and 26b are brought close to the center of the cross section of the tie bar 22 after being brought into contact (die touch), there is little possibility of deformation or partial wear of the sliding portion mentioned above, The tie bar fixing device 26 can be operated reliably.

  The preferred embodiment of the present invention has been described above, but the technical scope of the present invention is not limited to the scope described in the above-described embodiment. Various modifications or improvements can be added to the above embodiments.

  In the above-described embodiment, the mold clamping mechanism 25 (mold clamping piston 25 a) arranged concentrically with the tie bar 22 is described as being provided in a portion (upper side) continuous with the penetrating portion of the tie bar 22 on the upper surface of the movable platen 23. However, the mold clamping mechanism 25 (mold clamping piston 25a) disposed concentrically with the tie bar 22 may be provided in the penetrating portion of the tie bar 22 of the movable plate 23 (mold mounting plate). Specifically, like the die-clamping machine of the die casting machine of Patent Document 1, the mold clamping piston 25a (Piston 410 of Patent Document 1) is built in the movable platen 23 (movable platen 3) (Patent Document 1). 1 and 2).

  In the above-described embodiment, the mold clamping mechanism 25 (mold clamping piston 25a) disposed concentrically with the tie bar 22 is provided in a portion (upper) continuous with the penetrating portion of the tie bar 22 on the upper surface of the movable platen 23, and the mold clamping is performed. Although it has been described that the tie bar fixing device 26 is fixed to one end (upper end) in the axial direction of the tie bar 22 of the mechanism 25 (clamping piston 25a), the tie bar fixing device 26 is arranged on the movable plate 23 and the tie bar is fixed. A mold clamping mechanism 25 (mold clamping piston 25 a) arranged concentrically with 22 may be provided on the stationary platen 21 side.

  In the above-described embodiment, the mold clamping mechanism 25 (mold clamping piston 25a) disposed concentrically with the tie bar 22 is provided in a portion (upper) continuous with the penetrating portion of the tie bar 22 on the upper surface of the movable platen 23, and the mold clamping is performed. Although it has been described that the tie bar fixing device 26 is fixed to one end (upper end) in the axial direction of the tie bar 22 of the mechanism 25 (the mold clamping piston 25a), the mold opening force due to the filling pressure of the molten metal into the mold cavity When it is possible to resist the mold clamping force generated by the driving means of the mold opening / closing mechanism, the lifting actuator 24, which is the mold opening / closing mechanism, functions as the mold clamping mechanism and is arranged concentrically with the tie bar 22. The mold clamping mechanism 25 (the mold clamping piston 25a) may not be provided.

  Further, the eccentricity of the tie bar 22 in the radial direction as described in the above-described embodiment is not only the operation of the locking members 26a and 26b of the tie bar fixing device 26, but also the sliding resistance when the movable platen 23 is raised and lowered. May increase. In other words, in the general mounting configuration of the tie bar bush 27 as shown in FIG. 5, the tie bar 22 can be allowed to be eccentric in the radial direction only for the sliding gap between the tie bar 22 and the tie bar bush 27. When more eccentricity occurs, an unacceptable amount of eccentricity in the radial direction of the tie bar 22 becomes a pressing force acting in the same direction on the inner peripheral surface of the tie bar bush 27 from the tie bar 22. This pressing force generates a frictional force according to the contact area between the tie bar 22 and the tie bar bush 27 on which the pressing force acts. Therefore, when the movable platen 23 is moved up and down by the lift actuator 24, the movable platen 23 and the upper mold 12 are used. The sliding resistance when the movable platen 23 to which other weight is applied is raised is increased.

  In the embodiment described above, the tie bar bush 27 is disposed in the penetrating portion of the tie bar 22 of the movable platen 23 to prevent the tie bar from being worn or damaged by the raising / lowering operation of the movable platen 23. However, in such a case, as shown in FIG. 8, the tie bar bush 27 is disposed in the movable plate 23 so as to be substantially concentric with the axis of the tie bar 22, while the tie bar 22 has a predetermined eccentric amount in the radial direction. Is effective for suppressing an increase in sliding resistance when the movable platen 23 is moved up and down. When such attachment of the tie bar bush 27 is employed, the eccentricity of the tie bar 22 in the radial direction as described in the above-described embodiment becomes larger, so that the vertical casting apparatus of this embodiment is more effective. It can be expected to have an effect. Reference numeral 27 a in FIG. 8 is a configuration including a plurality of elastic bodies arranged in a state where an elastic force is generated in the radial direction of the tie bar 22, or a configuration including the elastic body, and is evenly arranged in the radial direction of the tie bar 22. A function of maintaining the position of the tie bar bush 27 in the movable plate 23 that is substantially concentric with the axis of the tie bar 22 and a function of allowing the tie bar bush 27 to be offset when the tie bar 22 is eccentric in the radial direction. Make them compatible.

  1 vertical casting apparatus, 11 lower mold, 12 upper mold, 21 fixed plate, 22 tie bar, 22 ′ eccentricity (tie bar 22), 23 movable plate, 25 mold clamping mechanism, 25a mold clamping piston, 25b mold clamping piston body, 25c mold oil chamber, 25d mold release oil chamber, 26 tie bar fixing device, 26a, 26b locking member, 26c driving means, 27 tie bar bush

Claims (5)

Placed on the mold mounting board,
The tie bar with respect to the mold mounting plate by two locking members configured to be able to approach and separate from each other in one radial direction of the tie bar with respect to the cross-sectional center of the tie bar passing through the mold mounting plate. Equipped with a tie bar fixing device that can arbitrarily deter / release movement in the axial direction of
The one direction in which the locking members of the tie bar fixing device approach and separate from each other is generated by deformation of the mold mounting plate, and the tie bar in the radial direction of the tie bar with respect to the mold mounting plate. A mold clamping device characterized by matching with the direction of eccentricity.   2. The mold clamping device according to claim 1, wherein a direction of the eccentricity of the tie bar coincides with a diagonal direction of the mold mounting board. The mold clamping device is concentric with the tie bar and is disposed in a through portion of the tie bar of the mold mounting plate or a portion continuous with the through portion, and the tie bar of the mold clamping piston. An oil chamber formed at both ends in the axial direction, and a mold clamping mechanism,
The mold clamping apparatus according to claim 1, wherein the tie bar fixing apparatus is fixed to one end of the mold clamping piston in the axial direction of the tie bar. The mold clamping device includes a mold clamping piston formed integrally with the tie bar at a through portion of the tie bar of one mold mounting plate or a portion continuous with the through portion, and the mold clamping piston. An oil chamber formed at both ends in the axial direction of the tie bar, and a mold clamping mechanism,
The mold clamping apparatus according to claim 1, wherein the tie bar fixing device is disposed on the other mold mounting plate.   The tie bar bushing arranged in the penetrating portion of the tie bar of the mold mounting board is configured to allow a predetermined amount of eccentricity in the radial direction of the tie bar. The mold clamping apparatus of any one of Claim 4.

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