JP2016107268A - Opening/closing apparatus and molding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an opening/closing apparatus which can use an extraction cylinder more appropriately.SOLUTION: A die cast machine 1 comprises: a fixed platen 9; a movable platen 11 which can move in a direction to open/close a mold relative to the fixed platen 9; tie bars 13 each stretching between the fixed platen 9 and the movable platen 11; an extraction cylinder 39 which can be attached to and detached from the tie bar 13 by a piston rod 45 and can extract the tie bar 13 from the movable platen 11; and a guide mechanism 41. The guide mechanism 41 has a fixed part 42 and a movable member 51 which is allowed to move in a direction parallel to the extraction cylinder 39 relative to the fixed part 42, the movable member 51 being fixed to the piston rod 45.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an opening / closing apparatus and a molding apparatus (molding machine) for opening / closing and clamping a mold. The molding apparatus is, for example, a die casting machine or an injection molding machine.

  There is known a die casting machine having a drawing cylinder for drawing a tie bar from a fixed die plate or a moving die plate (for example, Patent Documents 1 to 3). By pulling out the tie bar, for example, mold exchange can be facilitated.

  Patent Document 1 discloses a die casting machine having a pulling cylinder provided on a movable die plate, a piston rod being fixed to a tie bar, and pulling the tie bar from the fixed die plate. Patent Document 2 discloses a die casting machine having an engagement / disengagement mechanism that is provided on a movable die plate and engages / disengages a piston rod and a tie bar of an extraction cylinder that extracts a tie bar from a fixed die plate in an extraction direction. Patent Document 3 discloses a die-casting machine having a pulling cylinder that is provided on a movable die plate, has a piston rod fixed to a tie bar, and pulls the tie bar from the fixed die plate, as in Patent Document 1. However, in Patent Document 3, a telescopic type (multistage cylinder) is adopted as the drawing cylinder.

JP 2005-144802 A JP 2007-76142 A JP 2003-334648 A

  The drawing cylinder is configured to be relatively long in order to sufficiently pull out the tie bar. Therefore, for example, in the techniques of Patent Documents 1 and 3, when the pulled tie bar is bent, the load is applied in a direction perpendicular to the axis with respect to the piston rod of the pulling cylinder, and an unnecessary moment is also generated. As a result, for example, the strength of the drawing cylinder may increase, or the operation of the drawing cylinder may not be smooth. For example, in the technique of Patent Document 2, there is a possibility that the piston rod of the drawing cylinder vibrates with respect to the tie bar. That is, the operation of the drawing cylinder may become unstable.

  Therefore, it is preferable to provide an opening / closing device and a molding device that can more suitably use the drawing cylinder.

  An opening / closing apparatus according to an aspect of the present invention includes a stationary platen that can hold one of the molds, a movable platen that can hold the other of the molds and is movable in the mold opening / closing direction with respect to the stationary platen, A tie bar that spans between the fixed platen and the movable platen; a piston rod that is detachable or fixed to the tie bar; and a pulling cylinder that can pull out the tie bar from the fixed platen or the movable platen; A movable member that is allowed to move in a direction parallel to the drawing cylinder with respect to the fixed portion, and the movable member includes a guide mechanism that is fixed to the piston rod.

  Preferably, the movable member is slidable in the fixed portion.

  Preferably, the drawing cylinder further has a cylinder portion, and the cylinder portion is a large-diameter cylinder member, and a small-diameter cylinder member that is taken in and out of the large-diameter cylinder member and that takes in and out the piston rod. The fixed portion is slidable in the large-diameter guide tube member fixed to the large-diameter cylinder member and the large-diameter guide tube member, and the movable member is slidable in the inside thereof. A small-diameter guide tube member.

  Preferably, the drawing cylinder further includes a cylinder portion, and the movable member has an end portion on a side opposite to a side connected to the piston rod when the piston rod is located at a retreat limit. , Located behind the cylinder part.

  Preferably, when the piston rod is positioned at the retreat limit, the movable member has an end opposite to the side connected to the piston rod protruding rearward from the fixed portion.

  Preferably, the drawing cylinder further includes a cylinder portion, and when the piston rod is located at a forward limit, the distance between the sliding fulcrum of the fixed portion relative to the movable member is the piston of the cylinder portion. It is longer than the distance between the sliding fulcrum against the rod.

  The shaping | molding apparatus which concerns on 1 aspect of this invention is equipped with said opening / closing apparatus.

  According to the present invention, it is possible to reduce the burden on the strength of the drawing cylinder or to smoothly operate the drawing cylinder.

The schematic diagram which shows the principal part structure of the die-casting machine which concerns on 1st Embodiment of this invention in a mold open state. The schematic diagram which shows the principal part structure of the die-casting machine of FIG. 1 in a mold-closed state. The schematic diagram which shows the principal part structure of the die-casting machine of FIG. 1 in a tie bar extraction state. 4A and 4B are schematic cross-sectional views showing the configuration of the guide mechanism of the die casting machine of FIG. The schematic diagram which shows the principal part structure of the die-casting machine which concerns on 2nd Embodiment of this invention in a mold open state.

<First Embodiment>
(Die-casting machine configuration)
1 to 3 are side views each including a sectional view of a part of the die casting machine 1 according to the first embodiment of the present invention. FIG. 1 shows a mold open state of the die casting machine 1. FIG. 2 shows the mold closed state of the die casting machine 1. FIG. 3 shows the tie bar extraction state of the die casting machine 1.

  The die casting machine 1 injects a molten metal (an example of a molten metal or molding material) into a mold 101 including a stationary mold 103 and a moving mold 105, and solidifies the molten metal to obtain a die cast product (an example of a molded product). Is a device for manufacturing.

  The die casting machine 1 includes, for example, a mold clamping device 3 that performs mold opening / closing and mold clamping of a mold 101, an injection device (not shown) that injects molten metal into the mold 101, and a die casting product that is a fixed mold 103 or a movable mold. It has an unillustrated extruding device that extrudes from the mold 105 and a control device 5 that controls these devices.

  The mold clamping device 3 is, for example, a base 7, a fixed die plate 9 that is provided on the base 7 and holds the fixed mold 103, and a movable die plate 11 that is provided on the base 7 and holds the movable mold 105. And an upper tie bar 13U and a lower tie bar 13D (hereinafter simply referred to as “tie bar 13”, which may not be distinguished from each other) spanning the fixed die plate 9 and the movable die plate 11.

  The base 7 is placed on, for example, a factory floor. The fixed die plate 9 and the movable die plate 11 are disposed on the base 7 so as to face each other. The fixed die plate 9 holds the fixed mold 103 on the mold mounting surface facing the movable die plate 11 and is fixed to the base 7. On the other hand, the movable die plate 11 holds the movable die 105 on the die mounting surface facing the fixed die plate 9 and is in the mold opening / closing direction (direction approaching / separating from the fixed die plate 9). ) Is movably provided.

  The mold 101 is closed by the movement of the movable die plate 11 in the direction close to the fixed die plate 9 (mold closing direction) (FIG. 2). Further, the mold 101 is opened by the movement of the movable die plate 11 in the direction away from the fixed die plate 9 (mold opening direction) (FIG. 1).

  For example, a plurality of tie bars 13 are provided around the mold 101. Specifically, for example, two upper tie bars 13U are provided at a position on the upper side with respect to the mold 101, and two lower tie bars 13D are provided at a position on the lower side with respect to the mold 101. Four are provided. For example, the four tie bars 13 are arranged symmetrically vertically and laterally about the mold 101. The tie bar 13 has a length that can be bridged between the fixed die plate 9 and the movable die plate 11 at least in the mold closed state.

  2, the end of the tie bar 13 on the fixed die plate 9 side is fixed to the fixed die plate 9, and the end of the tie bar 13 on the moving die plate 11 side is fixed to the moving die plate 11. By pulling backward (on the opposite side of the fixed die plate 9 and the left side of the drawing), the tie bar 13 can be extended, and a mold clamping force corresponding to the extension amount can be generated.

  The mold clamping device 3 is constituted by, for example, a so-called composite mold clamping device, and has a driving means for performing mold opening and closing and a driving means for performing mold clamping separately. Specifically, the mold clamping device 3 includes, for example, an electric mold opening / closing drive device 15 for performing mold opening and closing and a mold clamping cylinder 17 for performing mold clamping.

  The mold opening / closing drive device 15 includes, for example, a rotary electric motor 19 and a screw mechanism 21 that converts the rotation of the electric motor 19 into a translational motion and transmits it to the movable die plate 11. The screw mechanism 21 is configured by, for example, a ball screw mechanism, and is fixed to the screw shaft 23 supported by the base 7 and the movable die plate 11 and screwed to the screw shaft 23 via a ball (not shown). And a nut 25.

  The screw shaft 23 is disposed so as to extend in the mold opening / closing direction, and is supported so as to be rotatable around the axis and not movable in the axial direction. The nut 25 is fixed to the movable die plate 11 so that it cannot rotate around the axis and can move in the axial direction. The rotation of the electric motor 19 is directly or indirectly transmitted to the screw shaft 23 via an appropriate gear mechanism or the like, and when the screw shaft 23 is rotated, the nut 25 moves in the axial direction. Thereby, the movable die plate 11 fixed to the nut 25 moves in the mold opening / closing direction.

  The mold clamping cylinder 17 includes, for example, a cylinder part 27 built in the movable die plate 11 and a mold clamping piston 29 that can slide in the cylinder opening / closing direction in the cylinder part 27.

  For example, the same number of mold clamping cylinders 17 as the tie bars 13 are provided corresponding to the plurality of tie bars 13. A tie bar 13 is inserted through the mold clamping piston 29. For example, the mold clamping piston 29 does not have a reference numeral, but contributes to the sealing of the two cylinder chambers at the front and rear ends of the piston body that divides the cylinder portion 27 into two cylinder chambers. And a portion having a smaller diameter than the piston main body.

  2, the end of the tie bar 13 on the fixed die plate 9 side is fixed to the fixed die plate 9, the tie bar 13 and the mold clamping piston 29 are engaged, and the mold clamping piston 29 is fixed. The tie bar 13 can be pulled by moving it to the opposite side of the die plate 9. As a result, the tie bar 13 can be extended and a mold clamping force corresponding to the extension amount can be generated.

  The lower tie bar 13D and the fixed die plate 9 are fixed by an appropriate fixing member including, for example, a bolt or the like. The upper tie bar 13U and the fixed die plate 9 are engaged and released in the mold opening / closing direction by, for example, the fixed-side engagement device 31. Thereby, the upper tie bar 13U can be pulled out from the fixed die plate 9 when the mold is exchanged. In the present embodiment, the lower tie bar 13D and the fixed die plate 9 are fixed by a fixing member, but the present invention is not limited to this. For example, similarly to the upper tie bar 13U, the lower tie bar 13D can be engaged and released in the mold opening / closing direction by the fixed die plate 9 and the fixed-side engagement device 31. You may be comprised so that it can pull out from the fixed die plate 9. FIG.

  The fixed-side engagement device 31 is, for example, a half nut supported not to be moved in the mold opening / closing direction with respect to the fixed die plate 9 and a liquid that drives the half nut in the opening / closing direction, although not particularly designated. And a pressure cylinder. On the other hand, at the end of the upper tie bar 13U on the fixed die plate 9 side, an engaged portion is formed by forming a plurality of grooves on the outer peripheral surface. When the half nut of the fixed side engaging device 31 is engaged with the engaged portion of the upper tie bar 13U, the upper tie bar 13U and the fixed die plate 9 are engaged in the mold opening / closing direction, and the engagement is released. The engagement is released.

  The engagement between the tie bar 13 and the mold clamping piston 29 in the mold opening / closing direction is performed by, for example, the moving side engagement device 33.

  The moving-side engagement device 33 is, for example, a half nut 35 provided so as not to move in the mold opening / closing direction with respect to the mold clamping piston 29 (movable in the mold opening / closing direction together with the mold clamping piston 29), and a half nut 35. And a nut opening / closing cylinder 37 that can be driven in the opening / closing direction. On the other hand, the tie bar 13 has a groove 13b to be engaged by forming a plurality of grooves on the outer peripheral surface. When the half nut 35 is engaged with the engaged groove portion 13b, the tie bar 13 and the mold clamping piston 29 are engaged in the mold opening / closing direction, and the engagement is released by releasing the engagement.

  The mold clamping device 3 includes, for example, a pulling cylinder 39 that generates a driving force for pulling out the upper tie bar 13U, a guide mechanism 41 for protecting the pulling cylinder 39, an upper tie bar 13U, and a pulling cylinder 39. And a connecting mechanism 43 for connecting the guide mechanism 41.

  The drawing cylinder 39 is configured by, for example, a telescopic hydraulic cylinder (a multistage cylinder having two or more cylinder members). Specifically, the drawing cylinder 39 has a piston rod 45 and a cylinder portion 40 in which the piston rod 45 is taken in and out. The cylinder portion 40 is slidable with a small-diameter cylinder member 47 that slidably accommodates a small-diameter piston 46 fixed to the rear end of the piston rod 45 and a large-diameter piston 48 fixed to the rear end of the small-diameter cylinder member 47. And a large-diameter cylinder member 49 to be housed. The drawing cylinder 39 may be configured such that the piston rod 45 and the small diameter cylinder member 47 can be driven separately, or configured so that the piston rod 45 and the small diameter cylinder member 47 can be driven only simultaneously. It may be.

  The drawing cylinder 39 is provided on the movable die plate 11, for example. That is, the large-diameter cylinder member 49 is fixed to the movable die plate 11 (via the member of the guide mechanism 41). The drawing cylinder 39 is disposed parallel to the mold opening / closing direction with the piston rod 45 facing the opposite side of the fixed die plate 9. Accordingly, the upper tie bar 13U is pulled out from the fixed die plate 9 as shown in FIG. 3 by extending the pulling cylinder 39 while the tip of the piston rod 45 and the upper tie bar 13U are connected by the connecting mechanism 43. Can do.

  The forward limit of the piston rod 45 (the position most extended from the cylinder portion 40) is, for example, that the small-diameter piston 46 abuts on a stopper (not shown) provided in the small-diameter cylinder member 47 (for example, the front end of the cylinder chamber), and This is a position where the large-diameter piston 48 abuts against a stopper (not shown) provided in the large-diameter cylinder member 49 (for example, the front end of the cylinder chamber). The retreat limit of the piston rod 45 (most position accommodated in the cylinder portion 40) is, for example, that the small-diameter piston 46 abuts a stopper (not shown) provided in the small-diameter cylinder member 47 (for example, the rear end of the cylinder chamber), In addition, the large-diameter piston 48 is in contact with a stopper (not shown) provided in the large-diameter cylinder member 49 (for example, the rear end of the cylinder chamber).

  The guide mechanism 41 includes, for example, a guide shaft 51 and a guide tube portion 42 through which the guide shaft 51 is slidably inserted in the axial direction. The guide tube portion 42 includes a small-diameter guide tube member 53 in which a guide shaft 51 is slidably inserted in the axial direction, and a large-diameter guide tube member in which the small-diameter guide tube member 53 is slidably inserted in the axial direction. 55.

  The guide mechanism 41 is provided on the movable die plate 11, for example. That is, the large diameter guide tube member 55 is fixed to the movable die plate 11. The fixed position is, for example, the upper part of the movable die plate 11 (above the upper tie bar 13U). The large diameter cylinder member 49 of the drawing cylinder 39 is fixed on a large diameter guide tube member 55, for example. The guide mechanism 41 is disposed in parallel to the mold opening / closing direction. The distal end of the guide shaft 51 and the distal end of the piston rod 45 are fixed to each other by a coupling mechanism 43. Therefore, as can be understood from FIGS. 1 and 3, when the extraction cylinder 39 is expanded and contracted, the guide shaft 51 slides on the small diameter guide tube member 53 and the small diameter guide tube member 53 increases in diameter. The guide tube member 55 is slid.

  The coupling mechanism 43 includes, for example, a base 57 to which the piston rod 45 and the guide shaft 51 are fixed, an engagement member 59 that is movably supported with respect to the base 57, and a connection cylinder 61 that moves the engagement member 59. And have.

  The material, shape, dimensions, and the like of the base body 57 may be appropriately set. For example, the base body 57 is configured by a substantially plate-shaped metal member or a combination thereof. The piston rod 45 and the guide shaft 51 may be appropriately fixed to the base body 57 using bolts or the like. The piston rod 45 and the guide shaft 51 are fixed to each other by being fixed to the base body 57.

  The engaging member 59 is made of, for example, a metal plate member, and is supported by the base body 57 so as to be slidable in the vertical direction. On the other hand, an engaged member 63 having a recess into which the engaging member 59 can be inserted is fixed to the end side of the upper tie bar 13U from the engaged groove portion 13b. The engaged member 63 may be regarded as a part of the upper tie bar 13U.

  As shown in FIG. 3, the engaging member 59 is moved downward and inserted into the recessed portion of the engaged member 63, whereby the piston rod 45 and the upper tie bar 13U are engaged in the mold opening / closing direction. Further, as shown in FIGS. 1 and 2, the engagement member 59 is moved upward and pulled out from the recessed portion of the engaged member 63 to release the engagement.

  The coupling mechanism 43 and the engaged member 63 are engaged with the engaging member 59 when, for example, the movable die plate 11 is in the mold opening position and the piston rod 45 of the drawing cylinder 39 is in the retreat limit. It is provided so that it can engage with the member 63.

  The control device 5 includes, for example, a computer having a CPU, a ROM, a RAM, an external storage device, and the like, although not particularly illustrated. The control device 5 controls operations of the mold clamping device 3, an unillustrated injection device, an unillustrated extrusion device, and the like. For example, the control device 5 outputs a control signal to the driver and / or the hydraulic circuit of the driving device of each device based on preset information and signals such as a sensor (position sensor or pressure sensor) (not shown). .

  FIG. 4A and FIG. 4B are schematic cross-sectional views showing the configuration of the guide mechanism of the die casting machine of FIG. 4A corresponds to the state in which the piston rod 45 of the drawing cylinder 39 is positioned at the retreat limit as shown in FIGS. 1 and 2, and FIG. 4B shows the piston rod 45 as shown in FIG. Corresponds to the state where is located at the forward limit. 4 is the same as the left-right direction of FIG.

  The guide shaft 51 is made of metal, for example, and the inside is hollow. The cross-sectional shape of the guide shaft 51 may be set as appropriate, but is circular, for example. The guide shaft 51 is, for example, a position where the end on the fixed die plate 9 side (the right side of the paper) protrudes from the small diameter guide tube member 53 to the fixed die plate 9 side (FIG. 4A) and the fixed die plate 9 The opposite end is movable between the small diameter guide tube member 53 and a position protruding from the fixed die plate 9 to the opposite side (FIG. 4B).

  4A is a position where the base 57 of the coupling mechanism 43 abuts (engages) with the end of the small-diameter guide tube member 53 on the opposite side to the fixed die plate 9, for example. An appropriate stopper may be provided instead of the base body 57. The position in FIG. 4B is a position where, for example, a stopper 51s provided on the fixed die plate 9 side of the guide shaft 51 abuts (engages) with a step provided in the small-diameter guide tube member 53. 4 (a) and 4 (b) may be defined by the backward limit and forward limit of the extraction cylinder 39 of the piston rod 45 in addition to or instead of the contact of the members as described above. Good.

  The protruding amount of the guide shaft 51 with respect to the small diameter guide tube member 53 at the position of FIG. 4A is, for example, approximately the same as the difference in length between the guide shaft 51 and the small diameter guide tube member 53 (for example, the difference in length). 80% or more and less than 100%). The protrusion amount of the guide shaft 51 with respect to the small diameter guide tube member 53 at the position of FIG. 4B is longer than, for example, the difference in length between the guide shaft 51 and the small diameter guide tube member 53. It is more than half and less than 2/3.

  The small diameter guide tube member 53 is made of, for example, metal and has a substantially cylindrical shape. The small-diameter guide tube member 53 has, for example, a pair of first bushes 65 that support the guide shaft 51. For example, the pair of first bushes 65 can support the guide shaft 51 over the movable range of the guide shaft 51 and are arranged so that the distance between them is as far as possible. For example, the pair of first bushes 65 includes an end portion of the small-diameter guide tube member 53 opposite to the fixed die plate 9, and a step portion in the small-diameter guide tube member 53 with which the stopper 51s of the guide shaft 51 is engaged. Is provided.

  For example, the small-diameter guide tube member 53 is opposite to the fixed die plate 9 at a position where the end on the fixed die plate 9 side protrudes from the large-diameter guide tube member 55 toward the fixed die plate 9 (FIG. 4A). The end portion on the side is movable between a position (FIG. 4B) that protrudes from the large-diameter guide tube member 55 to the opposite side of the fixed die plate 9.

  The position of FIG. 4A is, for example, that the stopper 53t provided on the opposite side of the small-diameter guide tube member 53 from the fixed die plate 9 is the end of the large-diameter guide tube member 55 on the opposite side of the fixed die plate 9. It is a position which contacts (engages). 4B, for example, the stopper 53s provided on the fixed die plate 9 side of the small diameter guide tube member 53 abuts (engages) the end of the large diameter guide tube member 55 on the fixed die plate 9 side. ).

  4A and the protruding amount of the small diameter guide tube member 53 with respect to the large diameter guide tube member 55 in FIG. 4B are, for example, the length of the small diameter guide tube member 53 and the large diameter guide tube member 55. It is equivalent to the difference in length (for example, 80% or more and less than 100% of the difference in length).

  The large-diameter guide tube member 55 is made of, for example, metal and has a substantially cylindrical shape. The large-diameter guide tube member 55 includes a pair of second bushes 67 that support the small-diameter guide tube member 53, for example. For example, the pair of second bushes 67 can support the small-diameter guide tube member 53 over the movable range of the small-diameter guide tube member 53 and are disposed so that the distance between them is as far as possible. For example, the pair of second bushes 67 are provided at both ends of the large-diameter guide tube member 55.

  The large-diameter guide tube member 55 is fixed to the moving die plate 11 as described above. The position of the large-diameter guide tube member 55 in the mold opening / closing direction with respect to the movable die plate 11 may be set as appropriate. For example, the large-diameter guide tube member 55 is arranged so as not to protrude toward the fixed die plate 9 with respect to the movable die plate 11 and to protrude toward the opposite side to the fixed die plate 9.

  For example, the guide mechanism 41 has a greater rigidity against a load in a direction perpendicular to the axis (the bending is reduced) and / or vibrates in a direction perpendicular to the axis than the extraction cylinder 39. It is configured so as to operate stably even when etc. are added. Such a configuration may be realized by an appropriate method.

  For example, the rigidity of the guide shaft 51 alone and / or the small diameter guide tube member 53 alone is higher than the rigidity of the piston rod 45 alone and / or the small diameter cylinder member 47 alone. More specifically, for example, the former moment of inertia of the former is higher than the moment of inertia of the latter, and / or the Young's modulus of the former material is higher than the Young's modulus of the latter material.

  Further, for example, rattling between the guide shaft 51 and the small-diameter guide tube member 53 is bent and / or these between the small-diameter guide tube member 53 and the large-diameter guide tube member 55 are bent. Such rattling may cause rattling between the piston rod 45 and the small diameter cylinder member 47 and / or bending between the small diameter cylinder member 47 and the large diameter cylinder member 49. Smaller than the wobble. More specifically, for example, the distance between the sliding fulcrums of the guide mechanism 41 (in this embodiment, constant regardless of the expansion / contraction state of the guide mechanism 41) is set when the extraction cylinder 39 is extended (for example, the piston rod 45 is moved forward). Longer than the distance between the sliding fulcrums. That is, in this embodiment, the distance between the pair of first bushes 65 and / or the distance between the pair of second bushings 67 is the front end of the small-diameter cylinder member 47 when the piston rod 45 is positioned at the forward limit ( Distance between the piston rod 45 and the small-diameter piston 46, and / or the front end of the large-diameter cylinder member 49 (support position of the small-diameter cylinder member 47) and the large-diameter when the small-diameter cylinder member 47 is positioned at the forward limit. The distance from the piston 48 is longer. Actually, the sliding fulcrum is not a point, but for example, the comparison may be made based on the outermost side of the pair of sliding fulcrums. Further, for example, in the drawing cylinder 39, since an elastic seal member is interposed between the members in order to reduce the leakage of the hydraulic fluid, the backlash between the members of the guide mechanism 41 is between the members of the drawing cylinder 39. Smaller than the backlash.

(Die-casting machine operation)
The operation of the die casting machine 1 having the above configuration will be described.

(Operation in molding cycle)
First, the operation in the molding cycle of the die casting machine 1 will be described.

  In the molding cycle, the upper tie bar 13U and the fixed die plate 9 are engaged by the fixed-side engaging device 31. Further, the engaging member 59 of the coupling mechanism 43 is separated from the engaged member 63, and the drawing cylinder 39 (and the guide mechanism 41) is not engaged with the upper tie bar 13U. This state is maintained over the molding cycle.

  At the start of the molding cycle, for example, as shown in FIG. 1, the die casting machine 1 is in the mold open state. That is, the movable die plate 11 is located at the mold opening position, and the fixed mold 103 and the movable mold 105 are separated from each other. The half nut 35 of the moving side engaging device 33 is opened, and the moving die plate 11 and the tie bar 13 are not engaged with each other.

  From the mold open state in FIG. 1, the control device 5 outputs a control signal to a driver (not shown) that drives the electric motor 19 of the mold opening / closing drive device 15 so as to move the movable die plate 11 in the mold closing direction. When the moving die plate 11 moves in the mold closing direction, as shown in FIG. 2, the moving mold 105 comes into contact with (or comes close to) the fixed mold 103, and the mold is closed.

  Next, the control device 5 outputs a control signal to a hydraulic circuit (not shown) that controls supply / discharge of the hydraulic fluid to / from the nut opening / closing cylinder 37 so as to close the half nut 35. Thereby, the movable die plate 11 and the tie bar 13 are engaged with each other.

  The half nut 35 and the engaged groove portion 13b are adjusted in position in the mold opening / closing direction within a range of less than one pitch of these grooves so that they are engaged with each other (one protrusion is fitted in the other groove). (Meshing adjustment) is performed. The meshing adjustment may be performed, for example, by adjusting the position of the tie bar 13 before the molding cycle so that the meshing is possible when the movable mold 105 contacts the fixed mold 103, or when the mold is closed. Alternatively, the position of the movable die plate 11 may be adjusted, or the position of the mold clamping piston 29 (and thus the position of the half nut 35) may be adjusted when the mold is closed.

  When the movable die plate 11 and the tie bar 13 are engaged, the control device 5 supplies and discharges the hydraulic fluid to and from the mold clamping cylinder 17 so that the mold clamping piston 29 moves to the side opposite to the fixed die plate 9. A control signal is output to a hydraulic circuit (not shown) to be controlled. Thereby, the tie bar 13 is pulled and extended, and a mold clamping force corresponding to the extension amount is generated.

  When the mold clamping force reaches a predetermined value and the mold clamping is completed, the control device 5 controls an injection device (not shown) so as to supply the molten metal into the mold 101. The molten metal injected into the mold 101 is solidified into a die cast product.

  When the molten metal is solidified to form a die-cast product, the control device 5 releases the pressure of the mold clamping cylinder 17 so as to release the tension applied to the tie bar 13 and eliminate the mold clamping force. Next, the control device 5 opens the half nut 35 and releases the engagement between the movable die plate 11 and the tie bar 13. Next, the control device 5 moves the movable die plate 11 to the mold opening position shown in FIG. Thereafter, preparation for the next cycle such as cleaning of the mold 101 and application of a release agent is performed.

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

  At the start of mold replacement, for example, the die casting machine 1 is in a state where the molding cycle is completed, that is, in the mold open state of FIG. Then, the control device 5 performs mold closing in accordance with the operator's input operation or the like until the mold contacts in the same manner as the mold closing in the above molding cycle (FIG. 2).

  After the mold contact, an operator or the like prepares to convey the fixed mold 103 and the movable mold 105 in a combined state. For example, the fixed mold 103 and the movable mold 105 are both suspended by a crane, and the fixation between the fixed mold 103 and the fixed die plate 9 and the fixation between the movable mold 105 and the movable die plate 11 are released. At this time, the fixed mold 103 may remain attached to the fixed die plate 9.

  When the work such as suspending the fixed mold 103 and the movable mold 105 with a crane is completed, the control device 5 moves the movable die plate 11 to the mold opening position in accordance with the operator's input operation or the like.

  Next, the control device 5 controls the fixed-side engagement device 31 so as to release the engagement between the upper tie bar 13U and the fixed die plate 9 automatically or in accordance with an operator's input operation or the like. Further, the control device 5 controls the coupling mechanism 43 so as to engage the upper tie bar 13U and the pulling cylinder 39 (and the guide mechanism 41) automatically or in response to an input operation by an operator.

  Next, the control device 5 provides a hydraulic circuit (not shown) that controls the supply and discharge of the hydraulic fluid to and from the drawing cylinder 39 so as to extend the drawing cylinder 39 automatically or in response to an operator's input operation or the like. Control. As a result, the upper tie bar 13U is pulled out from the fixed die plate 9.

  Thereafter, the mold 101 is carried out upward or sideward by a crane or the like. Then, a new mold 101 is carried between the fixed die plate 9 and the movable die plate 11 by a crane or the like.

  After the new mold 101 is carried in, the control device 5 performs, for example, an operation reverse to that when the tie bar is pulled out. For example, the control device 5 controls the drawing cylinder 39 so as to insert the upper tie bar 13U into the fixed die plate 9 in accordance with an input operation or the like by the operator. Next, the control device 5 controls the fixed-side engagement device 31 so as to engage the upper tie bar 13U and the fixed die plate 9 automatically or in response to an input operation by an operator, and the upper tie bar. The coupling mechanism 43 is controlled so that the engagement between the 13U and the drawing cylinder 39 is released. Next, the fixed mold 103 is fixed to the fixed die plate 9 and the movable mold 105 is fixed to the movable die plate 11 by the operator. Thereafter, the control device 5 moves the movable die plate 11 to the mold opening position in accordance with an input operation or the like by the operator.

  As described above, in this embodiment, the die casting machine 1 can hold the fixed die plate 9 that can hold the fixed die 103 and the movable die 105 and move in the mold opening / closing direction with respect to the fixed die plate 9. The movable die plate 11, the fixed die plate 9 and the tie bar 13 (upper tie bar 13U) spanning the movable die plate 11, and the piston rod 45 are detachable or fixed to the tie bar 13, and the movable die plate is stretched. 11 has a pulling cylinder 39 that can pull the tie bar 13 from the guide 11, and a guide mechanism 41. The guide mechanism 41 has a guide tube portion 42 (fixed portion) and a guide shaft that is allowed to move in a direction parallel to the drawing cylinder 39 with respect to the guide tube portion 42 and is restricted from moving in a direction intersecting the parallel direction. 51 (movable member), the guide tube portion 42 is fixed to the cylinder portion 40 of the drawing cylinder 39, and the guide shaft 51 is fixed to the piston rod 45.

  Therefore, for example, when the upper tie bar 13U is bent, when a load is applied to the piston rod 45 in a direction perpendicular to the axis, a part of the load is also supported by the guide mechanism 41, The burden on the drawing cylinder 39 is reduced. That is, the drawing cylinder 39 is protected. Further, for example, the vibration of the piston rod 45 in the direction perpendicular to the axis thereof is suppressed by the guide mechanism 41, and consequently the movement of the piston rod 45 is stabilized. As a result, the upper tie bar 13U can be pulled out smoothly.

  Moreover, in this embodiment, the guide mechanism 41 is fixed to the cylinder part 40, the guide tube part 42 as a fixed part, the guide shaft 51 as a movable member that can slide in the guide tube part 42, have.

  Therefore, for example, the configuration of the guide mechanism 41 is simple. Further, for example, the vibration of the movable member (guide shaft 51) in the direction orthogonal to the drawing cylinder 39 is reliably regulated. For example, it is easy to attach the guide mechanism 41 to a narrow position such as the upper part of the movable die plate 11 together with the drawing cylinder 39.

  In the present embodiment, the cylinder portion 40 includes a large-diameter cylinder member 49 and a small-diameter cylinder member 47 that is taken in and out of the large-diameter cylinder member 49 and that takes in and out the piston rod 45. The guide tube portion 42 is slidable in the large diameter guide tube member 55 fixed to the large diameter cylinder member 49 and the large diameter guide tube member 55, and a small diameter guide in which the guide shaft 51 can slide. A tube member 53.

  Accordingly, both the drawing cylinder 39 and the guide mechanism 41 are telescopic, and are shortened during the molding cycle, while the upper tie bar 13U can be pulled out sufficiently.

  In the present embodiment, the guide shaft 51 has an end portion (more specifically, a rear end) opposite to the side connected to the piston rod 45 when the piston rod 45 is in the retreat limit. ) Is located behind the cylinder portion 40 (on the fixed die plate 9 side).

  Since the small-diameter piston 46 of the drawing cylinder 39 is accommodated in the cylinder portion 40, it is naturally not located behind the cylinder portion 40. On the other hand, the guide shaft 51 and the piston rod 45 are fixed to each other (at the tip). Therefore, the guide shaft 51 is longer than the entire length of the piston rod 45 and the small diameter piston 46. As a result, for example, the guide shaft 51 can more easily secure the length of the rear portion supported when extending forward (on the side opposite to the fixed die plate 9) than the piston rod 45 and the small-diameter piston 46 as a whole. That is, it is easy to lengthen the fixed sliding fulcrum (for example, to increase the distance between the sliding fulcrums), and it is easy to suppress vibration in the direction perpendicular to the axis of the guide shaft 51.

  Further, in the present embodiment, the guide shaft 51 has a guide tube portion whose rear end is the end opposite to the side connected to the piston rod 45 when the piston rod 45 is located at the retreat limit. Projecting backward from 42.

  Therefore, even if the guide shaft 51 is lengthened so that the rear portion of the guide shaft 51 supported when the guide shaft 51 extends forward (on the side opposite to the fixed die plate 9) is secured long, the guide tube 51 The part 42 is shortened. Therefore, the guide mechanism 41 as a whole can be reduced in size.

  In the present embodiment, when the piston rod 45 is positioned at the forward limit, the distance between the sliding fulcrums of the guide tube portion 42 with respect to the guide shaft 51 (the distance between the pair of first bushings 65) is the cylinder portion. It is longer than the distance between the sliding fulcrums of the 40 piston rods 45 (the distance between the front end of the small diameter cylinder member 47 and the small diameter piston 46).

  Therefore, the bending of the guide shaft 51 with respect to the guide tube portion 42 is easily suppressed. As a result, it becomes easy to protect the drawing cylinder 39 by the guide mechanism 41 and to stabilize its operation.

  Moreover, in this embodiment, the cylinder part 40 and the guide tube part 42 are being fixed to the movement die plate 11, and the moving side engagement which performs the engagement in the axial direction of the piston rod 45 and the tie bar 13 and its cancellation | release is performed. A device 33 is provided.

  Accordingly, as shown in FIGS. 1 and 2, unlike the aspect in which the piston rod 45 and the tie bar 13 are fixed (this aspect is also included in the present invention), in the mold opening and closing, the drawing cylinder 39 and the guide mechanism 41 are It does not have to work. In such a configuration, since the piston rod 45 and the tie bar 13 are not fixed, the piston rod 45 is likely to vibrate in a direction perpendicular to its axis, but such vibration is reduced by the guide mechanism 41. .

  In the first embodiment described above, the die casting machine 1 is an example of a molding device, the mold clamping device 3 is an example of an opening / closing device, or an example of a mold opening / closing device, and the guide tube portion 42 or the large-diameter guide tube member. 55 is an example of a fixed part, and the guide shaft 51 is an example of a movable member. The fixed die plate 9 is an example of a fixed platen or an example of a fixed platen, and the moving die plate 11 is an example of a moving platen or an example of a moving platen. The mold opening / closing drive device 15 is an example of an opening / closing drive device. The fixed mold 103 is an example of one of the molds and an example of the other of the molds. The moving mold 105 is an example of the other mold, and is an example of one of the molds.

<Second Embodiment>
FIG. 5 is a side view corresponding to FIG. 1 of the die casting machine 201 according to the second embodiment. In the description of the second embodiment, the same or similar configurations as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description may be omitted.

  The die casting machine 201 is different from the first embodiment in that the drawing cylinder 239 and the guide mechanism 241 are not telescopic.

  Specifically, the drawing cylinder 239 includes a piston rod 245, a piston (not shown) fixed to the piston rod 245, and a cylinder member 249 that slidably accommodates the piston. The guide mechanism 241 includes a guide shaft 251 and a guide tube member 255 through which the guide shaft 251 is slidably inserted. The piston rod 245 and the guide shaft 251 are fixed to each other by the connecting mechanism 43. The cylinder member 249 and the guide tube member 255 are fixed to each other and fixed to the moving die plate 11.

  In the present embodiment, the cylinder member 249 is an example of a cylinder member as well as an example of a cylinder member. Similarly, the guide tube member 255 is an example of a guide tube member and an example of a guide tube portion.

  Further, in this embodiment, the engaged member 263 fixed to the upper tie bar 13U has a plurality of recesses (263a, 263b) that can engage with the engaging member 59 at different positions in the mold opening / closing direction (in FIG. 5). 2 places). In this embodiment, as shown in FIG. 5, two recesses that can be engaged with the engagement member 59 are provided, but the present invention is not limited to this. For example, you may have three or more recessed parts which can engage with the engaging member 59 in the mutually different position of a type | mold opening / closing direction.

  When pulling out the upper tie bar 13U, first, the engaged member 263 is engaged with the first recess 263a, and the pulling cylinder 239 is extended. Next, the engagement between the engaged member 263 and the first recess 263a is released, and the drawing cylinder 239 is contracted. Next, the engaged member 263 is engaged with the second recess 263b, and the extraction cylinder 239 is extended.

  With the above operation, the upper tie bar 13U can be sufficiently pulled out even with the relatively short drawing cylinder 239 and guide mechanism 241. In addition, when inserting the upper tie bar 13U into the fixed die plate 9, a procedure reverse to the above may be performed.

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

  The molding machine (molding apparatus) is not limited to a die casting machine. For example, the molding machine may be another metal molding machine, an injection molding machine, or a molding machine that molds a material obtained by mixing wood powder with a thermoplastic resin or the like. . Further, the molding machine is not limited to horizontal mold clamping horizontal injection, and may be vertical mold clamping vertical injection, horizontal mold clamping vertical injection, vertical mold clamping horizontal injection, for example.

  The basic structure of the mold clamping device (opening / closing device) is not limited to that exemplified in the embodiment. For example, the mold clamping device is not limited to a composite type, and may be a toggle type. The mold clamping device is not limited to a hybrid type using both a hydraulic device and an electric motor. Alternatively, the entire mold opening / closing and clamping may be performed by an electric motor. When the mold clamping cylinder is provided on the die plate as in the embodiment, the mold clamping cylinder may be provided on the fixed die plate, or may be provided on the die plate from which the tie bar is pulled out.

  The tie bar may be withdrawn from the moving die plate instead of from the stationary die plate. In this case, for example, the drawing cylinder and the guide mechanism are provided on the fixed die plate.

  Further, the tie bar and the drawing cylinder and / or the guide mechanism may be fixed, not engaged / disengaged in the drawing direction. However, in this case, for example, in a configuration in which the tie bar is pulled out from the fixed die plate by a pulling cylinder provided on the movable die plate, the pulling cylinder needs to be expanded and contracted when the mold is opened and closed.

  Moreover, the tie bar pulled out among the plurality of tie bars is not limited to the upper tie bar, and may be, for example, all tie bars.

  The configuration of the guide mechanism is not limited to that having a guide shaft and a guide tube portion. For example, the guide mechanism may include a rail extending in the mold opening / closing direction and a movable member guided by the rail.

  Further, when the guide mechanism has a guide shaft and a guide tube portion, the number of guide tube members is not limited to 1 or 2, and may be 3 or more. The combination of the number of cylinder members of the drawing cylinder and the number of guide tube members is not limited to 1: 1 (see the second embodiment) and 2: 2 (see the first embodiment), for example, 1: 2. 2: 1. Further, a pair of bushes may not be provided between the guide shaft and the guide tube member and / or between the guide tube members, or a rolling bearing may be provided instead of the bush.

  The length of the guide shaft relative to the guide tube member or the projectable amount, and the length or the projectable amount of the guide tube member outside the guide tube member may be appropriately set. For example, the guide shaft overlaps the entire guide tube member with respect to the guide tube member through which the guide shaft is slidably inserted, similarly to the movement of the small diameter guide tube member with respect to the large diameter guide tube member of the embodiment. It may be movable only within a range. Further, for example, the small-diameter guide tube member may protrude with respect to the large-diameter guide tube member with a difference between the lengths of the both in the same manner as the guide shaft of the embodiment.

DESCRIPTION OF SYMBOLS 1 ... Die casting machine, 3 ... Clamping device (opening / closing device), 9 ... Fixed die plate (fixed platen, fixed plate), 11 ... Moving die plate (moving platen, moving plate), 13 ... Tie bar, 13U ... Upper tie bar, DESCRIPTION OF SYMBOLS 29 ... Pulling cylinder, 40 ... Cylinder part, 41 ... Guide mechanism, 42 ... Guide tube part (fixed part), 45 ... Piston rod, 51 ... Guide shaft (movable member), 55 ... Large diameter guide tube member (fixed part) , 103 ... fixed mold, 105 ... moving mold.

Claims (7)

A fixed platen capable of holding one of the molds;
A movable platen capable of holding the other of the molds and movable in the mold opening and closing direction with respect to the fixed platen;
A tie bar spanning the stationary platen and the movable platen;
A pulling cylinder in which a piston rod is detachable or fixed to the tie bar and can pull the tie bar from the fixed platen or the movable platen;
A fixed mechanism, and a movable member that is allowed to move in a direction parallel to the extraction cylinder with respect to the fixed member, and the movable member is fixed to the piston rod, and a guide mechanism,
Opening and closing device having. The switchgear according to claim 1, wherein the movable member is slidable in the fixed portion. The drawing cylinder further has a cylinder portion,
The cylinder part is
A large-diameter cylinder member;
A small-diameter cylinder member that is taken in and out of the large-diameter cylinder member and takes in and out the piston rod,
The fixing part is
A large-diameter guide tube member fixed to the large-diameter cylinder member;
The switchgear according to claim 1 or 2, further comprising: a small-diameter guide tube member that is slidable in the large-diameter guide tube member and in which the movable member is slidable. The drawing cylinder further has a cylinder portion,
The movable member has an end opposite to a side connected to the piston rod when the piston rod is located in a retreat limit, and located behind the cylinder. 4. The switchgear according to any one of items 3. The end of the movable member, which is opposite to the side connected to the piston rod, protrudes rearward from the fixed portion when the piston rod is positioned at the retreat limit. The switchgear according to any one of the above. The drawing cylinder further has a cylinder portion,
The distance between the sliding fulcrum with respect to the movable member of the fixed part is longer than the distance between the sliding fulcrum with respect to the piston rod of the cylinder part when the piston rod is located at the forward limit. The switchgear according to any one of the above.   The shaping | molding apparatus provided with the opening / closing apparatus of any one of Claims 1-6.

Images