JP2017042767A - Vertical casting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vertical casting apparatus capable of restraining increase of the sliding resistance at elevation of a movable plate resulting from the curving deformation of a fixed plate at molten metal charging.SOLUTION: There is provided a vertical casting apparatus 1 comprising: a fixed plate 21 to which a bottom force 11 is installed; four tie bars 22 erected by penetrating the four corners of the fixed plate 21; a movable plate 23 disposed above the fixed plate 21 to be liftable by the guide of the tie bar 22 and having a top force 12 installed to face the bottom force 11; and a tie bar bush-supporting structure 26 movably and elastically supporting a prescribed amount of the tie bar bush 25 in which the tie bar 22 is inserted in a direction nearly horizontal to the movable plate 23 in a bush holding part 26a of the movable plate 23.SELECTED DRAWING: Figure 3

Description

  The present invention includes a vertical casting apparatus comprising four tie bars that are vertically provided through the four corners of a fixed platen, and a movable plate that is disposed above the fixed plate so as to be moved up and down while being guided by the tie bar. About.

  The casting apparatus is an apparatus for casting a metal product of a desired shape by filling a mold cavity in a mold with a molten metal (molten metal) and cooling and solidifying it. Generally, molds with a two-part structure are clamped by a clamping device (clamping / clamping) with a predetermined clamping force, and filling the mold cavity with molten metal (injection filling) Depending on the combination of methods, there are casting devices of various configurations.

  Among these casting apparatuses, a vertical casting apparatus having a vertical mold clamping apparatus forms a mold cavity (space) in a mold composed of a lower mold and an upper mold clamped by the vertical mold clamping apparatus, The molten metal is filled from below the mold cavity. As such a vertical casting apparatus, a vertical injection apparatus is provided, and a casting apparatus for a squeeze casting method (molten forging method) in which molten metal is injected and filled at a low speed and high pressure, as in Patent Document 1 and Patent Document 2. From the holding furnace (molten metal tank / crucible) placed below the fixed base (base plate / fixed plate) to which the lower mold is attached via the stalk (molten metal supply member) A casting apparatus for a low pressure casting method in which a molten metal is directly filled at a low speed and a low pressure is known.

  In the vertical casting apparatus for the squeeze casting method and the low pressure casting method, since the high-temperature molten metal is charged at a low speed from the mold cavity side on the lower mold side of the mold in the clamped state, The lower mold having a longer molten metal residence time and the fixed board to which the lower mold is attached are heated faster than the movable board to which the mold is attached. 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) with respect to the upper surface on which the continuous mold mounting surface is formed. A large opening is formed on the lower surface side for connection to the lower mold (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.

  And the vertical deformation | transformation of the stationary platen at the time of filling with a molten metal of the above vertical casting apparatuses is the vertical casting apparatus for low pressure casting methods (for example, patent document) in which a crucible and a holding furnace are arrange | positioned directly under a stationary platen. 1 and the low-pressure casting apparatus of Patent Document 2). One of the reasons is that the crucible and holding furnace are placed directly below the fixed plate, in contrast to the squeeze casting method in which the molten metal is supplied from the crucible and holding furnace outside the casting device to the sleeve of the injection device by a hot water supply device. The low-pressure casting method in which the molten metal is directly filled into the mold cavity via the molten metal supply member (Stoke) without touching the outside air is that the molten metal at a higher temperature is filled in the mold cavity. . 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.

  Another reason is that the stationary platen is constantly heated from the lower surface side by radiant heat from a crucible or holding furnace arranged immediately below the stationary platen. The amount of radiant heat acting on the movable platen disposed above the fixed platen is very small relative to the amount of radiant heat acting on the fixed platen. On the other hand, even if this radiant heat is from the lower surface side of the fixed platen, the large opening on the lower surface side of the fixed plate described above, the back side of the upper surface (mold mounting surface) (the lower surface of the fixed platen / the bottom surface of the opening) ) Is heated, the amount of thermal expansion in the horizontal direction on the upper surface side of the stationary platen is further increased.

  With the bending deformation of the fixed platen as described above, the tie bars that are erected through the four corners of the fixed plate also tend to move in the direction in which the distance on the upper end side of each tie bar increases (opens). However, since each tie bar is made to penetrate the movable platen via the tie bar bush, movement in the direction in which the upper end side of such a tie bar opens (substantially horizontal direction) is restricted. As a reaction force, the tie bar presses the tie bar bush in a substantially horizontal direction. As a result, the sliding resistance increases on the surface (line) in the direction in which the tie bar presses against the tie bar bush, and excessive lifting force is required to raise the movable platen from the mold-clamped state, or the tie bar is baked. There is a problem that it is difficult to raise the movable platen.

  In order to avoid such a problem, a gap slightly larger than a general sliding gap for allowing sliding between the tie bar and the tie bar bush is secured, and the tie bar (tie bar bush) is abbreviated. It is common to allow the movement in the horizontal direction to suppress an increase in sliding resistance when moving up and down the movable platen. However, for the purpose of guiding the raising and lowering of the movable platen by the tie bar, there is an upper limit on the gap that can be secured between the tie bar and the tie bar bush, and a casting apparatus for a large squeeze casting method with a large area of the mold mounting surface, In the vertical casting apparatus for the low pressure casting method in which the curved deformation of the fixed plate is remarkable, there is a problem that the increase of the sliding resistance when moving up and down the movable plate cannot be sufficiently suppressed by ensuring the gap.

  In order to solve the above problem, in the low-pressure casting apparatus of Patent Document 1, an upper mold lifting mechanism that guides the lifting and lowering of the movable die base to which the upper mold is attached by a single hollow rod disposed at the center of the movable die base. Proposed. Patent Document 2 proposes a low-pressure casting apparatus that thermally insulates the base plate from the lower die by mounting the lower die on the base plate (fixed platen) via a heat insulating material.

JP 2000-052023 A JP 2014-104469 A

  In the low-pressure casting apparatus of Patent Document 1, the movable die base to which the upper die is attached is guided by a single hollow rod arranged at the center of the movable die base, so that even if the fixed plate is curved and deformed, the movable die base is movable. There is little influence on the guide part of raising and lowering the die base. However, for the hollow rod that guides the raising and lowering of the movable die base (movable platen), a thick pipe material having an appropriate outer diameter and strength is selected according to the size of the movable die base and the weight including the upper die, The outer peripheral surface of this pipe material is finished by machining, and a bush suitable for the outer diameter after machining of this pipe material is prepared, or the pipe material is adjusted to an outer diameter suitable for a large diameter bush available on the market. Need to be machined. Further, since the outer peripheral surface of the hollow rod needs to be processed with a non-rotating groove or the like, there is a problem that the structure of the upper mold lifting mechanism including the hollow rod and the bush becomes special and expensive.

  On the other hand, in the low-pressure casting apparatus of Patent Document 2, by mounting the lower mold on the base plate (fixed platen) via a heat insulating material, the base plate is thermally insulated from the lower die, and the bending of the fixed platen is performed. It is said that deformation can be suppressed. However, since the heat insulating material is generally a non-ferrous material, its compressive strength and wear resistance are low compared to metal materials, and in view of the frequency of mold replacement, it can be accurately and stably stabilized over the long term. There is a problem that the mold cannot be mounted (fixed) on the base plate. Moreover, even if the heat propagation from the lower mold can be insulated by this heat insulating material, the radiant heat acting on the base plate from the stalk (molten supply member) or the molten metal tank inserted into the opening on the bottom surface of the base plate is heat. There is a problem that it is not insulated and the bending deformation of the stationary platen cannot be sufficiently suppressed.

  The present invention has been made in view of the above-described problems. Specifically, it is possible to suppress an increase in sliding resistance when the movable platen is raised and lowered due to the curved deformation of the fixed platen when the molten metal is filled. An object is to provide a vertical casting apparatus.

The object of the present invention is to provide a fixed plate to which the lower mold is attached,
Four tie bars installed vertically through the four corners of the fixed plate;
Above the fixed platen, a movable platen that is guided by the tie bar and can be moved up and down, and an upper die is attached to face the lower die,
A tie bar bush support structure in which the tie bar bush into which the tie bar is inserted is elastically supported by a predetermined amount in a substantially horizontal direction with respect to the movable plate at the bush holding portion of the movable plate, and
Is achieved by a vertical casting apparatus comprising:

  In other words, a tie bar bushing structure in which a tie bar bush into which a tie bar is inserted is elastically supported by a predetermined amount in a substantially horizontal direction with respect to the movable plate at a bush holding portion of the movable plate so as to be movable is normally used. The centering function for maintaining the lifting and lowering guide function and the movement of the tie bar in the substantially horizontal direction, that is, the function of allowing the eccentricity of the tie bar center axis from the original position are compatible, and at the time of filling the molten metal It is possible to suppress an increase in sliding resistance when the movable plate is raised and lowered due to the curved deformation of the fixed plate.

  In this vertical casting apparatus, the tie bar bush support structure is elasticized by horizontal pressing means for applying a pressing force from the bush holding part side of the movable plate to the central axis side of the tie bar. The tie bar bush may be configured to be supported, or the tie bar bush is configured to be elastically supported by a horizontal tension unit that applies a tensile force from the central axis side of the tie bar to the bush holding unit side of the movable platen. May be.

  In the vertical casting apparatus, the tie bar bush support structure may further include a configuration in which the tie bar bush is elastically supported by a vertical pressing means that applies a pressing force opposed in the vertical direction. You may further provide the structure which elastically supports a tie bar bush with the vertical tension | tensile_strength which acts the tension | pulling force spaced apart to a perpendicular direction.

  Furthermore, the tie bar bush support structure may be configured in the movable platen.

A vertical casting apparatus according to the present invention includes a stationary platen to which a lower mold is attached,
Four tie bars installed vertically through the four corners of the fixed plate;
Above the fixed platen, a movable platen that is guided by the tie bar and can be moved up and down, and an upper die is attached to face the lower die,
A tie bar bush support structure in which the tie bar bush into which the tie bar is inserted is elastically supported by a predetermined amount in a substantially horizontal direction with respect to the movable plate at the bush holding portion of the movable plate, and
The tie bar bush supporting structure in which the tie bar bush into which the tie bar is inserted is elastically supported by a predetermined amount in a substantially horizontal direction with respect to the movable plate at the bush holding portion of the movable plate. , Fixed platen when filling molten metal with both a centering function to maintain the function of raising and lowering the movable platen by the tie bar during normal operation and a function allowing the horizontal movement (eccentricity) of the tie bar It is possible to suppress an increase in sliding resistance at the time of moving up and down the movable plate, which is caused by the curved deformation.

It is a schematic side view of the vertical casting apparatus which concerns on Example 1 of this invention. It is A arrow directional view of FIG. It is an enlarged view of the principal part X of FIG. FIG. 4 is a view taken in the direction of arrow B in FIG. 3. It is an image figure which shows the curved deformation of the stationary platen of the vertical casting apparatus which concerns on Example 1 of this invention. It is explanatory drawing of a ball plunger. It is a figure which shows another form of the principal part X of FIG. It is a figure which shows another form of the principal part X of FIG. It is a figure which shows another form of the principal part X of FIG.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings.

  A vertical casting apparatus according to Embodiment 1 of the present invention will be described with reference to FIGS.

  First, the configuration of the vertical casting apparatus according to the first embodiment of the present invention 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 elevating actuator 24 that moves the movable platen 23 up and down with respect to the fixed platen 21 is disposed. In addition, 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 a two-dot chain line in FIG.

  In the first embodiment, the elevating actuator 24 is a hydraulic cylinder that is operated by supplying hydraulic oil. Although it is possible to fix the cylinder body (head) side and the piston rod (rod) side of the hydraulic cylinder to either the fixed platen 21 or the movable platen 23, the cylinder body of the hydraulic cylinder is used in the first embodiment. The (head) side is fixed to the upper surface of the fixed platen 21 and the piston rod (rod) side is fixed to the lower surface of the movable platen 23. The configuration in which the elevating actuator 24 is such a hydraulic cylinder is an example, and the type, fixing position, and fixing method of the elevating actuator 24 are not limited.

  A tie bar bush 25 into which the tie bar 22 is inserted can be moved by a predetermined amount in a substantially horizontal direction with respect to the movable platen 23 in the bush holding portion 26a of the movable platen 23 at a through portion of the tie bar 22 on the upper surface of the movable platen 23. A tie bar bush support structure 26 for elastic support is provided. The tie bar bush support structure 26 is schematically shown in FIG. 1 and will be described in detail separately with reference to FIGS.

  On the other hand, a fixing nut 27 for fixing the tie bar 22 to the fixed platen 21 is disposed in a through portion of the tie bar 22 on the lower surface of the fixed platen 21. The fixing nut 27 is a general configuration that is employed in a device that fixes a tie bar and a fixing plate through which the tie bar passes, such as a horizontal casting device (die casting machine). Specifically, a female screw portion (not shown) threadedly engaged with a male screw portion (not shown) machined on the outer peripheral surface of the lower end of the tie bar 22 has a fixing nut 27 machined on its inner circumferential surface. The lower end of the tie bar 22 is screwed to increase the outer diameter of the lower end, and the fixing nut 27 is fixed to the fixing plate 21 with a bolt or the like. Of course, between the tie bar 22 and the fixing nut 27, a detent is applied (not shown) with the fixing nut 27 screwed into the lower end of the tie bar 22.

  The fixing nut 27, that is, the lower end side of the tie bar 22 is connected to the base member 31. In the first embodiment, the base member 31 is a gantry structure assembled by welding or bolting using a structural steel material such as H steel, and is held below the stationary platen 21 by such a gantry structure. It is assumed that the furnace 41 is accommodated. The upper end of the molten metal supply member 41a (Stoke) standing upward from the molten metal supply part of the holding furnace 41 housed immediately below the fixed platen 21 is connected to the gate (molten metal) of the lower mold 11 through the opening 21a of the fixed platen 21. Connected to a supply port (not shown).

  A mold cavity (not shown) is formed between the clamped lower mold 11 and upper mold 12, and the mold cavity and the gate of the lower mold 11 are communicated. Then, when an inert gas or the like is supplied at a predetermined pressure from an inert gas supply device (not shown) to a space portion of a molten metal holding chamber (not shown) having airtightness in the holding furnace 41, The surface of the molten metal in the 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 41a. It can be supplied (filled) into the cavity. In the vertical casting apparatus 1, casting is performed in this way. Note that the holding furnace 41 is substantially omitted by a horizontal movement / lifting mechanism (not shown) and a guide member (not shown) installed on the foundation so as to guide the holding furnace 41 directly below the fixed platen 21. It is configured to be movable in the horizontal direction.

  Next, the tie bar bush holding structure of the vertical casting apparatus according to the first embodiment of the present invention will be described in detail with reference to FIGS.

  After the cast product cast in the previous casting cycle is taken out of the apparatus from the mold by a product take-out means or the like (not shown), the movable plate 23 is lowered by the lifting / lowering actuator 24, and the upper mold 12 is moved. The lower mold 11 is closed. Such ascending / descending operation of the movable platen 23 with respect to the fixed platen 21 is performed by guiding the tie bar 22. As shown in FIG. 3, the tie bar bush 25 that is actually guided to the tie bar 22 is elastically supported in a substantially horizontal direction by the horizontal pressing means 26 b in the bush holding portion 26 a of the tie bar bush support structure 26. In the low pressure casting method, since the molten metal is filled from below the lower mold 11 at a low pressure, it is not necessary to clamp the lower mold 11 and the upper mold 12 with a large mold clamping force when filling the molten metal. The vertical casting apparatus 1 according to the present embodiment does not include a mold clamping device, and the mold clamping force is sufficiently obtained by the resultant force of the mold closing force of the lifting actuator and the weight of the movable plate 23 and the upper mold 12. Shall.

  The horizontal pressing means 26b is configured to apply a pressing force from the bush holding portion 26a to the central axis side of the tie bar 22, and in this embodiment, a ball plunger as shown in FIG. 6 is used as the horizontal pressing means 26b. ing. The ball plunger is an elastic body such as a compression spring in which a movable body having a spherical body (FIGS. 6A and 6C) or a columnar shape (FIG. 6B) is built in a main body, and with a predetermined pressing force. The main body protrudes from one end of the main body. When a force greater than the pressing force acts in a direction against the pressing force, the protruding movable portion is pushed back by a predetermined amount as shown in FIG. Has been. The main body has a plug-like shape (FIGS. 6A and 6B) in which the outer peripheral surface is processed with a male screw, and a bolt in consideration of the screwing of the attachment member into the female screw portion with a tool such as a screwdriver Various shapes such as a shape (FIG. 6 (c)) are commercially available, and the size, pressing force, and pushing back stroke (α in FIG. 6 (a)) also have various specifications according to the application. Things are available. The ball plunger is one of the preferred configurations for the horizontal pressing means 26b, but the configuration of the horizontal pressing means 26b is not limited.

  On the other hand, in this embodiment, as shown in the main part Y of FIG. 3, the horizontal pressing means 26b is screwed into the female threaded portion processed into the bush holding portion 26a, and has two upper and lower stages (see FIG. 3). The tie bar bushes 25 that are arranged at intervals of 45 degrees in the circumferential direction (see FIG. 4) are elastic so that the center of the bush holding portion 26a and the axis center of the tie bar 22 coincide with each other. It is supported. In order to simplify the drawing, the illustration of the locking means such as the locking nut of the horizontal pressing means 26b is omitted. In addition, the fixing method and arrangement | positioning of the horizontal press means 26b in this bush holding | maintenance part 26a are examples, Comprising: The arrangement | positioning of a present Example is not limited.

  The bush holding portion 26a is easily fixed to the hole processed in the movable platen 23 with an inlay. A small diameter portion for securing the tie bar bush 25 is formed below the bush holding portion 26a so as to secure a predetermined clearance from the lower end surface of the tie bar bush 25, and the dust seal is detachable from the lower side. 26c is attached. Similarly, a retaining member 26d is attached above the bush holding portion 26a so as to secure a predetermined clearance from the upper end surface of the tie bar bush 25.

  Above the bush holding portion 26a, a bush cover 26e is fixed to the movable platen 23, and a dust seal 26c is detachably attached above the bush cover 26e. The bush cover 26e may be configured to also serve as a retaining member 26d on the upper side of the tie bar bush 25.

  As described above, the tie bar bush 25 is elastically supported in the substantially horizontal direction with respect to the movable plate 23 in the bush holding portion 26a in a state where the tie bar 22 is inserted. The centering function for maintaining the elevation guide function is exhibited, and when the movable platen 23 is moved up and down with respect to the fixed platen 21, the movable platen 23 can be guided to the tie bar 22 and accurately moved up and down. When aligning the upper mold 12, a large load is not applied to the guide members of both molds, and accurate mold alignment (mold touch) is possible.

  Further, as described above, in the vertical casting apparatus 1, when the molten metal is filled in the mold cavity, the fixed platen 21 is curved and deformed. As the fixed platen 21 is curved and deformed, the tie bars 22 that are erected through the four corners of the fixed platen 21 also have a direction (substantially horizontal direction) in which the distance on the upper end side of each tie bar 22 increases (opens). Try to move to). This image is shown in FIG.

  In this case, it is assumed that the tie bar bush 25 is pressed to the right side in FIG. 3 by the tie bar 22 (pressing force 1). When the pressing force 1 becomes larger than the pressing force 2 of the horizontal pressing means 26b from the bush holding portion 26a to the central axis side of the tie bar 22 (pressing force 1> pressing force 2), as shown in FIG. Then, the pressed tie bar bush 25 pushes back the moving part of the ball plunger in contact with the ball plunger main body. According to the amount of the movable portion pushed back at this time, that is, the amount of movement of the tie bar 22 in the substantially horizontal direction, an increase in sliding resistance when the movable plate is raised can be suppressed.

  Specifically, in this embodiment, when the pressing force 1> the pressing force 2, the tie bar bush 25 has the same center as the tie bar bush 25 and has a diameter outside the tie bar bush 25 as shown in FIG. Movement in any direction in a substantially horizontal direction within a circle (two-dot chain line) having a diameter + 2α is allowed. Therefore, it is possible to suppress an increase in sliding resistance when the movable plate is raised and lowered due to the curved deformation of the fixed plate during filling of the molten metal.

  Then, after the mold cavity is filled with the molten metal, solidification of the molten metal proceeds, so that the movable plate 23 to which the upper mold 12 is attached is heated in the horizontal direction immediately after the start of the molten metal filling. Thermal expansion. On the other hand, since the temperature of the fixed platen 21 to which the lower mold 11 is attached is lowered immediately after the start of the molten metal filling, the bending deformation is alleviated. As a result, when the pressing force 1 described above is lower than the pressing force 2 of the horizontal pressing means 26b from the bush holding portion 26a toward the central axis of the tie bar 22 (pressing force 1 <pressing force 2), the ball plunger The movable part that has been pushed back to the main body side pushes the tie bar bush 25 in contact back to the central axis side of the tie bar 22. Thus, even if the center of the bush holding portion 26a and the shaft center of the tie bar 22 are decentered by the alignment function of the tie bar bush support structure 26, the tie bar bush 25 is aligned again so that these centers coincide with each other. Thus, the movable platen 23 can be raised and lowered smoothly with respect to the fixed platen 21.

  By satisfying both the alignment function of the tie bar bush 25 of the tie bar bush support structure 26 and the function of allowing the tie bar to move in the substantially horizontal direction (eccentricity), the mold cavity is filled with molten metal every moment. According to the change of the pressing force 1 exerted on the tie bar bush 25 by the tie bar 22, it is possible to allow the tie bar 22 to appropriately move in the substantially horizontal direction with respect to the movable plate 23. The purpose of guiding the raising and lowering can also be achieved.

  Therefore, in the design of the vertical casting apparatus, the thermal stress analysis at the time of filling the mold cavity with the molten metal is performed in advance, so that the bending of the fixed platen 21 and the accompanying tie bar 22 in the substantially horizontal direction are performed. It is preferable to obtain the amount of movement and the pressing force 1 acting on the tie bar bush 25 due to the horizontal movement of the tie bar 22. By doing so, specifications required for the horizontal pressing means 26b, such as the amount of movement of the tie bar 22 in the substantially horizontal direction and the pressing force 2, which can sufficiently suppress an increase in sliding resistance when the movable plate is raised and lowered. Can be assumed. Based on this assumption, when the horizontal pressing means 26b is, for example, a ball plunger, the specifications of the individual ball plungers (the maximum pushback stroke of the movable part, the elastic modulus of the elastic body such as a compression spring, etc.) It is possible to make a concrete plan of arrangement (how many steps are arranged up and down at intervals in the circumferential direction, etc.).

  Further, when the amount of movement of the tie bar 22 in the substantially horizontal direction and the pressing force 1 acting on the tie bar bush 25 are large due to the thermal stress analysis as described above, a design problem occurs in the specification and arrangement of the horizontal pressing means 26b. Alternatively, a member that fixes the distance between the upper ends of adjacent tie bars 22 and restricts the distance between the upper ends of the tie bars 22 may be disposed. By disposing such a member on the upper end of the adjacent tie bar 22, the amount of movement of the tie bar 22 in the substantially horizontal direction caused by the curved deformation of the stationary platen 21 at the time of filling the molten metal, or the pressing force 1 acting on the tie bar bush 25 Can be reduced. It should be noted that even if the distance between the upper ends of adjacent tie bars 22 is strongly restrained, it is difficult to give the tie bars 22 rigidity or strength to maintain linearity against the curved deformation of the fixed platen 21. Needless to say, it is difficult to solve the problem of the present invention due to the restriction of the distance between the upper ends of adjacent tie bars 22.

  The present invention is not limited to the above embodiment and can be implemented in various forms. For example, in the above embodiment, the horizontal pressing means 26b of the tie bar bush support structure 26 is a ball plunger as shown in FIG. 6, but as shown in FIG. 7, a spring 51 is provided between the tie bar bush 25 and the bush holding portion 26a. It may be in a form of being connected with. If the spring 51 is a compression spring, it becomes another form of the horizontal pressing means 26b, and if it is a tension spring, it becomes the horizontal tensioning means 51a in which the direction of the force applied to the tie bar bush 25 is different from that of the horizontal pressing means 26b. In the case of using the spring of FIG. 6, a bush ring 51b for fixing one end of the spring is arranged on the tie bar bush 25, and the spring fixed to the bush ring 51b is compressed from the outer peripheral side of the bush support portion 26s. It is preferable to arrange a spring fixing means 51c that can be in a state or a tension state.

  In the above-described embodiment, the tie bar 22 has a predetermined clearance with respect to the upper end surface and the lower end surface of the tie bar bush 25 and the stoppers are arranged depending on the degree of bending deformation of the fixed platen 21. This is because the moving direction is not an accurate horizontal direction, but includes a vertical movement vector to some extent. When the retainer is arranged so as to come into contact with the upper end surface and the lower end surface of the tie bar bush 25, the movement of the tie bar 22 in the substantially horizontal direction itself is hindered to further increase the sliding resistance when the movable plate is raised. This is a clearance in the vertical direction intended to avoid this. Since the vertical movement vector when the tie bar 22 moves is very small, it is not necessary to secure a large clearance.

  However, when the movable platen 23 is moved up and down, the tie bar bush 25 is moved along the vertical clearance in the bush holding portion 26a. If this is a problem, as shown in FIG. You may further provide the structure elastically supported in an up-down direction. As such a configuration in which the tie bar bush 25 is elastically supported in the vertical direction, a pressing force is applied to the tie bar bush 25 in the vertical direction by the same ball plunger as the horizontal pressing means 26b of the above embodiment in FIG. The vertical pressing means 81 to be shown is shown. On the other hand, as a configuration in which the tie bar bush 25 is elastically supported in the vertical direction, a spring may be arranged in the vertical direction as in FIG. If the spring is a compression spring, it becomes another form of the vertical pressing means 81, and if it is a tension spring, the direction of the force applied to the tie bar bush 25 is different from the vertical pressing means 81, and a tensile force that separates in the vertical direction is applied. The vertical pulling means 82 (not shown) is used.

  Moreover, in the said Example, the tie bar bush support structure 26 was made into the form comprised by the penetration part of the tie bar 22 in the movable board 23. FIG. However, as shown in FIG. 9, the bush support portion 26 a is easily fixed to the upper surface side (or the lower surface side / not shown) of the movable platen 23 with an inlay, and the tie bar bush 25 is arranged outside the movable platen 23. Configuration is also possible. There are various restrictions on the arrangement of the bush support portion 26a outside the movable platen 23 on either the upper surface side or the lower surface side. If this can be solved, processing of the through portion of the tie bar 22 of the movable platen 23 is possible. Or the replacement of the tie bar bush 25 is facilitated (in the case of arrangement on the upper surface side of the movable platen 23). For the sake of simplicity, the illustration of the dust seal 26c is omitted in FIG.

DESCRIPTION OF SYMBOLS 1 Vertical casting apparatus 11 Lower mold 12 Upper mold 21 Fixed plate 22 Tie bar 23 Movable plate 25 Tie bar bush 26 Tie bar bush support structure 26a Bush holding part 26b Horizontal pressing means 51 Spring (horizontal pressing means / horizontal tension means)
51a Horizontal tension means 81 Vertical pressing means 82 Vertical tension means

Claims (6)

A fixed plate to which the lower mold can be attached;
Four tie bars installed vertically through the four corners of the fixed plate;
Above the fixed platen, a movable platen that is guided by the tie bar and can be moved up and down, and an upper die is attached to face the lower die,
A tie bar bush support structure in which the tie bar bush into which the tie bar is inserted is elastically supported by a predetermined amount in a substantially horizontal direction with respect to the movable plate at the bush holding portion of the movable plate, and
A vertical casting apparatus comprising:   The tie bar bush support structure is configured to elastically support the tie bar bush by horizontal pressing means for applying a pressing force from the bush holding part side of the movable plate to the central axis side of the tie bar. 2. A vertical casting apparatus according to 1.   The tie bar bush support structure is configured to elastically support the tie bar bush by horizontal tension means that applies a tensile force from a central axis side of the tie bar to the bush holding part side of the movable platen. 2. A vertical casting apparatus according to 1.   The scissors according to any one of claims 1 to 3, wherein the tie bar bushing support structure further includes a configuration in which the tie bar bushing is elastically supported by a vertical pressing unit that applies a pressing force opposed in the vertical direction. Mold casting equipment.   The scissors according to any one of claims 1 to 3, wherein the tie bar bushing support structure further comprises a structure in which the tie bar bushing is elastically supported by a vertical tension means that applies a tensile force that is separated in the vertical direction. Mold casting equipment.   The vertical casting apparatus according to any one of claims 1 to 5, wherein the tie bar bush support structure is configured in the movable platen.

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