JP5005411B2 - Mold opening and closing device - Google Patents

Description

  The present invention relates to a mold opening / closing device.

  Conventionally, in a molding machine, for example, an injection molding machine, a resin heated and melted in a heating cylinder is injected at a high pressure to fill the cavity space of the mold apparatus, and is cooled and solidified in the cavity space. Then, the molded product is taken out.

  FIG. 2 is a view showing a conventional mold opening / closing device.

  In the figure, 10 is a mold apparatus, 11 is a mold clamping apparatus, and the mold apparatus 10 includes a fixed mold 13 and a movable mold 14, and the mold clamping apparatus 11 includes a fixed platen 16 and the fixed platen. 16, a toggle support 17 disposed facing the fixed platen 16, a tie bar 18 laid between the fixed platen 16 and the toggle support 17, a movable platen 19 disposed so as to be movable back and forth along the tie bar 18, and a toggle mechanism 41. When a mold clamping motor (not shown) for operating the toggle mechanism 41 is provided, the mold clamping motor is driven, and the toggle mechanism 41 is operated to move the movable platen 19 forward and backward with respect to the fixed platen 16. The mold 14 is advanced and retracted, and the mold apparatus 10 can be closed, clamped and opened.

On the other hand, an injection device (not shown) includes a heating cylinder that heats and melts the resin supplied from the hopper, an injection nozzle that injects the molten resin, and the like so that the screw can freely advance and retract in the heating cylinder, It is rotatably arranged. Then, the screw can be rotated by driving the metering motor, the resin melted in front of the screw can be stored, and the screw can be retracted accordingly, so that the metering can be performed. Also, by driving the injection motor, the screw can be advanced to inject resin from the injection nozzle and fill the cavity space in the mold apparatus 10 (see, for example, Patent Document 1).
JP 2005-335131 A

  However, in the conventional mold clamping apparatus 11, the heat distribution in the fixed mold 13 cannot be made uniform, so that the quality of the molded product is deteriorated.

  That is, as the molding is performed, a large amount of heat is transmitted from the fixed mold 13 to the fixed platen 16, but the fixed platen 16 is fixed on the frame Fr. In the vicinity of the near lower end, the amount of heat flowing through the frame Fr is large, whereas in the vicinity of the upper end far from the frame Fr, the amount of heat flowing through the frame Fr is small.

  Therefore, the heat distribution in the stationary platen 16 is not uniform, and accordingly, the heat distribution in the stationary mold 13 is not uniform, so that deformation is increased in the upper portion. As a result, the molded product cannot be molded with high accuracy.

  It is an object of the present invention to provide a mold opening / closing device that can solve the problems of the conventional mold clamping device and can accurately mold a molded product.

Therefore, in the mold opening and closing device of the present invention, a frame, a first support member fixed to the frame, and a second support member fixed to the frame so as to face the first support member A first plate member attached to an end of the tie bar with a predetermined distance between the tie bar supported by the first and second support members and the frame; A first mold attached to the plate member, a second plate member disposed so as to be movable back and forth along the tie bar, and a second mold attached to the second plate member, And a drive unit for moving the second plate member forward and backward to bring the second mold into contact with and away from the first mold.
The first support member slidably supports the tie bar.

According to the present invention, in the mold opening and closing apparatus, the frame, the first support member fixed to the frame, and the second support member fixed to the frame so as to face the first support member A first plate member attached to an end of the tie bar with a predetermined distance between the tie bar supported by the first and second support members and the frame; A first mold attached to the plate member, a second plate member disposed so as to be movable back and forth along the tie bar, and a second mold attached to the second plate member, And a drive unit for moving the second plate member forward and backward to bring the second mold into contact with and away from the first mold.
The first support member slidably supports the tie bar.

  In this case, the plate member is attached to the end portion of the tie bar at a predetermined distance from the frame, and the die is attached to the plate member. However, heat does not flow directly from the plate member to the frame.

  Therefore, the heat distribution in the plate member becomes uniform, and accordingly, the heat distribution in the mold becomes uniform, so that the molded product can be molded with high accuracy.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this case, an injection molding machine as a molding machine will be described.

  FIG. 1 is a view showing a mold opening / closing device according to a first embodiment of the present invention, and FIG. 3 is a sectional view taken along line XX of FIG.

  In the figure, Fr is a frame, 10 is a mold apparatus, 11 is a toggle type mold clamping apparatus, and the mold apparatus 10 includes a fixed mold 23 as a first mold, and the fixed mold 23. A movable mold 24 is provided as a second mold disposed so as to be able to contact and separate. The fixed mold 23 is attached to a mold attachment surface of a mold attachment member 31 disposed on the fixed platen 36. The mold mounting surface is formed so as to protrude rearward (movable mold 24 side) from the rear end face (end surface on the movable mold 24 side) of the support plate 34. In the present embodiment, the movable mold 24, the mold mounting member 31, and the mold member 32 are all formed in a rectangular shape, but may also have a circular shape. In the present embodiment, the mold attachment member 31 is formed as a separate member from the fixed platen 36 and is attached to the fixed platen 36 by bolts or the like as a fixing element. Can be integrally formed by casting or the like, and the mold mounting surface can be projected.

  An injection device (not shown) is disposed on the right side in FIG. The injection device includes a heating cylinder as a cylinder member that heats and melts resin as a molding material supplied from a hopper, an injection nozzle that injects molten resin, and the like as an injection member in the heating cylinder. The screw is disposed so as to be movable forward and backward and rotatable. Then, by driving a metering motor as a metering drive unit, the screw can be rotated, the resin melted in front of the screw can be stored, and the screw can be retracted accordingly. Further, by driving an injection motor as an injection drive unit, the resin can be injected from the injection nozzle and filled into the cavity space in the mold apparatus 10 by advancing the screw.

  On the other hand, the mold clamping device 11 is fixed at a predetermined position on the frame Fr, and a support plate 34 serving as a first support member disposed in a standing manner, with a predetermined distance from the support plate 34. A support plate 35 as a second support member that is fixed and fixed at a predetermined position on the frame Fr, and a first plate that is disposed in front of the support plate 34 (on the injection device side). Between the fixed platen 36 as a member and the support plates 34 and 35, a toggle plate 37 as a rear platen disposed as movably standing on the frame Fr and as a third support member, A plurality of support plates 34, 35 and a toggle support 37 are installed between the fixed platen 36 and the support plate 35. In the present embodiment, tie bars 38 as four connecting members, and movable as second plate members disposed along the tie bars 38 so as to be movable back and forth between the support plate 34 and the toggle support 37. A platen 39, a toggle mechanism 41 serving as a mold clamping force generator disposed between the movable platen 39 and the toggle support 37, a mold clamping motor for operating the toggle mechanism 41, and the like are provided. The toggle mechanism 41 constitutes a first drive unit for mold clamping, and the mold clamping motor constitutes a second drive unit for mold clamping.

  When the mold clamping motor is driven and the toggle mechanism 41 is operated to move the movable platen 39 forward and backward with respect to the fixed platen 36, the movable mold 24 is advanced and retracted and is brought into and out of contact with the fixed mold 23. The mold device 10 can be closed, clamped and opened. Along with the mold clamping, a cavity space (not shown) is formed between the fixed mold 23 and the movable mold 24.

  As shown in FIG. 3, the support plate 34 is composed of first and second support bodies 43 and 44 that are fixed and separated from each other on the right and left sides, and each of the first and second support bodies. 43 and 44 surround the mold mounting member 31 and are fixed to the frame Fr by bolts bt. The tie bars 38 are slidably supported via bushes 46 as bearing members at two locations above and below the first and second support bodies 43 and 44. Further, the mold attachment member 31 is disposed so as to penetrate between the first and second support bodies 43 and 44.

  The support plate 35 is integrally formed, has a rectangular shape, and is fixed to the frame Fr by bolts bt. The rear ends (ends on the opposite side of the injection device) of the tie bars 38 are fixed at the left and right upper and lower portions of the support plate 35, and the tie bars 38 extend forward (injection device side). And is passed through the toggle support 37, the movable platen 39, the support plate 34, and the fixed platen 36, and is fixed to the fixed platen 36 at the front end (end on the injection device side).

  For this purpose, each tie bar 38 includes a head portion (not shown) at the rear end, and a screw portion 48 that is formed in the fixed platen 36 and protrudes forward from the front end, and the head portion is the support plate 35. The fixing nut 49 is screwed into the threaded portion 48 by being engaged with the support plate 35 inside. The screw portion 48 has a smaller diameter than other portions, and a step portion is formed between the screw portion 48 and the other portions. Therefore, the tie bar 38 and the fixed platen 36 can be connected by applying the end surface of the fixed platen 36 to the stepped portion and tightening the fixing nut 49. In this manner, the fixed platen 36 is disposed so as to be movable with respect to the frame Fr while being supported by the tie bar 38 and at a predetermined distance from the frame Fr.

  In this embodiment, the tie bar 38 is formed with a head portion at the rear end, but a screw portion similar to the screw portion 48 is formed, and a fixing nut 49 and a screw portion are formed on the screw portion. A similar fixing nut can be screwed together to connect the tie bar 38 and the support plate 35. The tie bar 38 is supported by the support plates 34 and 35 and the toggle support 37.

  The movable platen 39 is advanced and retracted at the upper and lower positions on the left and right sides with a predetermined distance from the frame Fr while being supported by the tie bars 38 via the bushes 50 as bearing members. Arranged freely.

  In the toggle support 37, an adjustment nut 51 as an adjustment member is disposed on an end surface side of the support plate 35 in contact with a surface of the flange 53 on the support plate 35 side of the toggle support 37, so that the adjustment is performed. The nut 51 has a threaded portion 52 at a location corresponding to the tie bar 38. Therefore, by rotating the adjustment nut 51 with respect to the tie bar 38, the tie bar 38 and the fixed platen 36 are moved back and forth with respect to the movable platen 39, thereby adjusting the thickness of the mold apparatus 10, that is, adjusting the mold thickness. Can do.

  The toggle support 37 is slidably disposed with respect to the frame Fr. For this purpose, a sliding bearing 55 is disposed at the lower end of the toggle support 37.

  The toggle mechanism 41 connects a toggle lever 58 as a first link supported to be swingable with respect to the toggle support 37, the toggle lever 58 and the movable platen 39, and the toggle lever 58 and the movable platen 39 are connected. The arm 59 as a second link supported so as to be swingable with respect to 39, and the toggle lever 58 and the cross head 61 are connected to each other, and are supported so as to be swingable with respect to the toggle lever 58 and the cross head 61. A toggle lever 62 as a third link is provided. The support plate 34 and the stationary platen 36 constitute the platen unit 100.

  In the mold opening / closing apparatus having the above-described configuration, a mold opening / closing processing means (mold opening / closing processing section) (not shown) performs mold opening / closing processing, drives the mold clamping motor, and closes the mold of the mold apparatus 10. Tighten and mold open.

  That is, in the mold closing process, the mold opening / closing processing means drives the mold clamping motor, moves the cross head 61 forward (moves toward the injection device side), operates the toggle mechanism 41, and extends it. Accordingly, the movable platen 39 is advanced, the movable mold 24 is advanced and brought into contact with the fixed mold 23, and the mold is closed.

  When the movable mold 24 and the fixed mold 23 are brought into contact with each other, the mold closing process is completed, and the mold clamping process is started. In the mold clamping step, the mold opening / closing processing means further drives the mold clamping motor to further extend the toggle mechanism 41. Accordingly, when the cross head 61 is placed at the forward limit position, the movable mold 24 is pressed against the fixed mold 23 with a predetermined mold clamping force, and mold clamping is performed.

  At this time, the movable mold 24 receives a reaction force against the mold clamping force from the fixed mold 23. The reaction force is transmitted to the toggle support 37 via the movable platen 39 and the toggle mechanism 41, and pushes the toggle support 37 toward the rear (opposite to the injection device). As described above, the toggle support 37 is slidably disposed with respect to the frame Fr via the sliding bearing 55, so that the toggle support 37 is slightly moved rearward due to the reaction force, but tilted rearward. There is nothing.

  In addition, since the toggle support 37 and each tie bar 38 are connected via the adjustment nut 51, the tie bar 38 is moved rearward as the toggle support 37 is moved rearward, and is similarly fixed. The platen 36 is moved backward. In this case, since the fixed platen 36 is not fixed to the frame Fr at the lower end, movement of the vicinity of the lower end and the vicinity of the upper end is not restricted as each tie bar 38 pulls the fixed platen 36 rearward. Therefore, the stationary platen 36 does not tilt backward. Although the support plate 34 is fixed to the frame Fr at the lower end, the tie bar 38 is disposed through the support plate 34 and does not receive a reaction force, so that it does not tilt.

  By the way, as described above, since the rear end of the tie bar 38 is fixed to the support plate 35, the portion of the tie bar 38 between the support plate 35 and the toggle support 37 is compressed by receiving a reaction force. In this state, the support plate 35 is pushed backward.

  In this embodiment, since the support plate 35 is fixed to the frame Fr at the lower end, the movement of the vicinity of the lower end is substantially restricted as each tie bar 38 pushes the support plate 35 backward. On the other hand, the movement in the upper vicinity is not restricted. However, since the toggle support 37 is disposed adjacent to the support plate 35 so as to be slidable with respect to the frame Fr, the support plate 35 does not tilt backward.

  Thus, when the mold clamping process is completed, the mold opening process is started. In the mold opening process, the mold opening / closing processing means further drives the mold clamping motor to bend the toggle mechanism 41. Accordingly, the movable platen 39 is retracted, the movable mold 24 is also retracted, and the mold opening is performed. Then, when the cross head 61 is placed at the retreat limit position and the toggle mechanism 41 is placed in the bent state, the mold opening process is completed.

  As described above, in the present embodiment, in the mold clamping process, the stationary platen 36 does not tilt even when subjected to the reaction force of the mold clamping force, so that the mold clamping of the mold apparatus 10 can be performed stably. it can. Therefore, the molded product can be accurately molded.

  By the way, as the molding is performed, a lot of heat is transmitted from the fixed mold 23 to the fixed platen 36. However, the fixed platen 36 is disposed at a predetermined distance from the frame Fr. The heat does not flow directly from the fixed platen 36 to the frame Fr.

  Therefore, the heat distribution in the fixed platen 36 becomes uniform, and the heat distribution in the fixed mold 23 becomes uniform, so that the molded product can be molded with high accuracy.

  Note that the heat transmitted to the fixed platen 36 flows to the support plate 34 via the tie bar 38 and further flows to the frame Fr. However, since the amount of heat flowing to the support plate 34 via the tie bar 38 is small, The heat distribution in the stationary platen 36 does not become uneven.

  Next, a second embodiment of the present invention will be described. In addition, about the thing which has the same structure as 1st Embodiment, the same code | symbol is provided and the effect of the same embodiment is used about the effect of the invention by having the same structure.

  FIG. 4 is a cross-sectional view of a mold opening / closing device according to a second embodiment of the present invention.

  In this case, the support plate 34 as the first support member is integrally formed, a through-hole 65 is formed in the center, and the die attachment member 31 is disposed through the through-hole 65. That is, the support plate 34 is disposed so as to surround the mold attachment member 31.

  Next, a third embodiment of the present invention will be described. In addition, about the thing which has the same structure as 1st Embodiment, the same code | symbol is provided and the effect of the same embodiment is used about the effect of the invention by having the same structure.

  FIG. 5 is a view showing a mold opening / closing device according to a third embodiment of the present invention.

  In this case, 71 is a direct-acting mold clamping device, and the mold clamping device 71 is fixed at a predetermined position on the frame Fr, and is a support plate serving as a first support member disposed upright. 72, a support plate 73 as a second support member as a rear platen disposed at a predetermined distance from the support plate 72, fixed at a predetermined position on the frame Fr, and disposed upright. In the present embodiment, a plurality of stationary platens 36 as first plate members disposed in front of the support plate 72 (on the injection device side) and a plurality of bridges installed between the support plate 72 and the support plate 73 are provided. Tie bars 38 as four connecting members (only two of the four tie bars 38 are shown in the figure), and support plates 72 along the tie bars 38. A movable platen 39 as a second plate member disposed so as to be movable forward and backward with respect to the support plate 73, and between the movable platen 39 and a toggle support 37 as a rear platen and as a third support member. And a mold clamping cylinder 74 serving as a mold clamping force generating section and a mold clamping drive section. The mold clamping cylinder 74 is driven to move the movable platen 39 against the fixed platen 36. When it is advanced and retracted, the movable mold 24 as the second mold is advanced and retracted and brought into and out of contact with the fixed mold 23 as the first mold, and the mold apparatus 10 is closed and clamped. And mold opening can be performed. The tie bar 38 is supported by support plates 72 and 73.

  In this case, the platen unit 100 is constituted by the support plate 72 and the fixed platen 36.

  The mold clamping cylinder 74 includes a cylinder portion 76 and a piston 77 disposed in the cylinder portion 76 so as to be slidable and movable back and forth. The piston 77 defines the cylinder portion 76. The first and second oil chambers 81 and 82 are formed in a head portion 78, extending forward from the head portion 78 and penetrating the support plate 73. A rod portion 79 attached to the movable platen 39 is provided.

  Like the support plate 34 in the first embodiment, the support plate 72 includes first and second supports 43 and 44 (FIG. 3) that are fixed and separated from each other on the left and right sides. The first and second supports 43 and 44 are fixed to the frame Fr by bolts bt, respectively. The tie bars 38 are slidably supported via bushes 46 as bearing members at two locations above and below the first and second support bodies 43 and 44. Further, the mold attaching member 31 is disposed so as to penetrate between and surround the first and second supports 43 and 44.

  The support plate 73 is integrally formed, has a rectangular shape, and is fixed to the frame Fr by bolts bt. Then, the rear end (the end opposite to the injection device) of each tie bar 38 is fixed to the support plate 73 at four positions on the left and right sides of the support plate 73, and each tie bar 38 extends forward. Thus, the movable platen 39, the support plate 72, and the fixed platen 36 are penetrated and fixed to the fixed platen 36 at the front end (end portion on the injection apparatus side).

  For this purpose, each tie bar 38 is provided with a threaded portion 48 formed in the fixed platen 36 at the front end and projecting forward, and formed in the support plate 73 at the rear end and projecting rearward. The fixing nuts 49 and 84 are screwed into the screw portions 48 and 83. The screw portions 48 and 83 are smaller in diameter than the other portions, and step portions are formed between the screw portions 48 and 83 and the other portions. Therefore, the tie bar 38 can be connected to the fixed platen 36 and the support plate 73 by applying the end surfaces of the fixed platen 36 and the support plate 73 to the stepped portion and tightening the fixing nuts 49 and 84. In this manner, the fixed platen 36 is disposed so as to be movable with respect to the frame Fr while being supported by the tie bar 38 and at a predetermined distance from the frame Fr.

  In the mold opening / closing apparatus having the above-described configuration, the mold opening / closing processing means drives the mold clamping cylinder 74 to perform mold closing, mold clamping, and mold opening of the mold apparatus 10.

  That is, in the mold closing process, when the mold opening / closing processing means drives the mold clamping cylinder 74 and moves the piston 77 forward (moves toward the injection device side), the movable platen 39 is advanced, and the movable mold 24 is moved forward. Is moved forward and brought into contact with the fixed mold 23 to close the mold.

  Subsequently, in the mold clamping process, the mold opening / closing processing means further drives the mold clamping cylinder 74 to further advance the piston 77 and place it at the forward limit position. Accordingly, the movable mold 24 is pressed against the fixed mold 23 with a predetermined mold clamping force, and the mold clamping is performed.

  At this time, the movable mold 24 receives a reaction force against the mold clamping force from the fixed mold 23. The reaction force is transmitted to the support plate 73 via the movable platen 39 and the mold clamping cylinder 74, and pushes the support plate 73 rearward. In this case, since the mold clamping cylinder 74 is disposed at the central portion of the support plate 73, it hardly tilts even if it receives a reaction force.

  Further, since the support plate 73 and each tie bar 38 are connected via the screw portion 83 and the fixing nut 84, the reaction force is transmitted to the fixed platen 36 via the tie bar 38. In this case, since the fixed platen 36 is not fixed to the frame Fr at the lower end, movement of the vicinity of the lower end and the vicinity of the upper end is not restricted as the reaction force is transmitted to the fixed platen 36. Therefore, the stationary platen 36 does not tilt backward.

  In this way, when the mold clamping process is completed, the mold opening process is started. In the mold opening process, the mold opening / closing processing means drives the mold clamping cylinder 74 to retract the piston 77. Accordingly, the movable platen 39 is retracted, the movable mold 24 is also retracted, and the mold opening is performed. Then, when the piston 77 is placed at the retreat limit position, the mold opening process is completed.

  As described above, in the present embodiment, in the mold clamping process, the stationary platen 36 does not tilt even when subjected to the reaction force of the mold clamping force, so that the mold clamping of the mold apparatus 10 can be performed stably. it can. Therefore, the molded product can be accurately molded.

  Next, a fourth embodiment of the present invention will be described. In addition, about the thing which has the same structure as 1st-3rd embodiment, the same code | symbol is provided and the effect of the same embodiment is used about the effect of the invention by having the same structure.

  FIG. 6 is a view showing a mold opening / closing device according to a fourth embodiment of the present invention.

  In the figure, 91 is a linear mold clamping device, Fr is a frame, Gd is laid on the frame Fr to form a rail, supports the mold clamping device 91, and serves as a first guide member for guiding. These are two guides (in the figure, only one of the two guides Gd is shown).

  The mold clamping device 91 is fixed to a predetermined position on the frame Fr, and is a support plate 72 serving as a first support member that is disposed upright, a predetermined distance from the support plate 72, and From the support plate 72, an electromagnet support 92 as a rear platen and as a second support member, which is fixedly provided at a predetermined position on the frame Fr so as to face the support plate 72, and as a second support member. In the present embodiment, there are a plurality of fixed platens 36 as first plate members disposed on the front side (injection apparatus side), and a plurality of the fixed platens 36 arranged between the electromagnet support 92 and the fixed platen 36. A tie bar 38 as a connecting member (only two of the four tie bars 38 are shown in the figure), and along the tie bar 38, a support plate 72 and an electric The movable platen 39 as the first movable member and the second plate member, which is disposed between the stone support 92 and on the guide Gd so as to be movable back and forth, and behind the electromagnet support 92 (injection device) A suction plate 93 as a second movable member, which is disposed so as to be movable back and forth along the guide post 95 on the opposite side), and for clamping the mold to advance and retract the suction plate 93 A linear motor 128 as a first drive unit, an electromagnet unit 94 as a second drive unit for mold clamping for moving the suction plate 93 back and forth, and a transmission member for transmitting the movement of the suction plate 93 to the movable platen 39. A rod 96 and the like are provided. The tie bar 38 is supported by the movable platen 39, the support plate 72, the electromagnet support 92, and the suction plate 93.

  In this case, the platen unit 100 is constituted by the support plate 72 and the fixed platen 36.

  The rod 96 is connected to the suction plate 93 at the rear end and is connected to the movable platen 39 at the front end. Therefore, the rod 96 advances the movable platen 39 as the suction plate 93 is moved forward when the mold is closed, and moves the movable platen 39 backward as the suction plate 93 is moved backward when the mold is opened.

  For this purpose, a hole 141 for penetrating the rod 96 and a hole 142 for penetrating the rod 96 are formed in the central portion of the electromagnet support 92, and the front end portion of the hole 141 is formed. A bearing member Br1 such as a bush for slidably supporting the rod 96 is disposed facing the opening. Further, a screw 143 is formed at the rear end portion of the rod 96, and the screw 143 and a nut 144 rotatably supported by the suction plate 93 are screwed together.

  The linear motor 128 includes a stator 129 as a first drive element disposed on the frame Fr in parallel with the guide Gd and corresponding to the movement range of the movable platen 39 and the suction plate 93, and At the lower end of the suction plate 93, there is provided a movable element 131 as a second driving element disposed opposite to the stator 129 and over a predetermined range, and a plurality of permanent magnets are arranged on the stator 129. A coil is disposed on the movable element 131. Then, when the linear motor 128 is driven by supplying a predetermined current to the coil, the movable element 131 is advanced and retracted, and accordingly, the suction plate 93 and the movable platen 39 are advanced and retracted to perform mold closing and mold opening. It can be carried out.

  For this purpose, the movable element 131 is attached to the lower end of the suction plate 93 via the slide base Sb. A space 215 is formed at the lower end of the electromagnet support 92 so as to penetrate the linear motor 128, the guide Gd, the slide base Sb, and the like.

  The electromagnet unit 94 includes an electromagnet 149 as a first drive member formed on the electromagnet support 92 side, and an adsorption portion 151 as a second drive member formed on the adsorption plate 93 side. The portion 151 is formed in a predetermined portion of the suction plate 93, in this embodiment, a portion that surrounds the rod 96 in the suction plate 93 and faces the electromagnet 149. A predetermined portion of the rear end surface of the electromagnet support 92, in this embodiment, slightly above and below the rod 96, extends in the horizontal direction and has two grooves 145 formed in parallel to each other. A core 146 having a rectangular shape between 145 and a yoke 147 are formed in other portions. A coil 148 is wound around the core 146.

  The core 146, the yoke 147, and the suction plate 93 are formed by laminating thin plates made of a ferromagnetic material, and constitute an electromagnetic laminated steel plate.

  Therefore, in the electromagnet unit 94, when a current is supplied to the coil 148, the electromagnet 149 is driven to attract the attracting portion 151 and generate the mold clamping force.

  By the way, when the mold closing is completed, the suction plate 93 is brought close to the electromagnet support 92, and a gap δ is formed between the electromagnet support 92 and the suction plate 93. However, the gap δ becomes too small, If it becomes too large, the adsorbing portion 151 cannot be adsorbed sufficiently and the mold clamping force will be reduced. The optimum gap δ changes as the thickness of the mold apparatus 10 changes.

  Therefore, a large-diameter gear (not shown) is formed on the outer peripheral surface of the nut 144, and a mold thickness adjusting motor (not shown) as a mold thickness adjusting drive unit is disposed on the suction plate 93. A small-diameter gear attached to the output shaft of the motor is meshed with a gear formed on the outer peripheral surface of the nut 144.

  Then, when the mold thickness adjusting motor is driven in accordance with the thickness of the mold apparatus 10 and the nut 144 is rotated by a predetermined amount with respect to the screw 143, the position of the rod 96 with respect to the suction plate 93 is adjusted, The position of the suction plate 93 with respect to the fixed platen 36 and the movable platen 39 is adjusted, and the gap δ can be set to an optimum value. That is, the mold thickness is adjusted by changing the relative positions of the movable platen 39 and the suction plate 93.

  In addition, this invention is not limited to the said embodiment, It can change variously based on the meaning of this invention, and does not exclude them from the scope of the present invention.

It is a figure which shows the type | mold opening / closing apparatus in the 1st Embodiment of this invention. It is a figure which shows the conventional type | mold opening / closing apparatus. It is XX sectional drawing of FIG. It is sectional drawing of the type | mold opening / closing apparatus in the 2nd Embodiment of this invention. It is a figure which shows the type | mold opening / closing apparatus in the 3rd Embodiment of this invention. It is a figure which shows the type | mold opening / closing apparatus in the 4th Embodiment of this invention.

Explanation of symbols

23 fixed mold 24 movable mold 31 mold mounting members 34, 35, 72, 73 support plate 36 fixed platen 37 toggle support 38 tie bar 39 movable platen 41 toggle mechanism 74 mold clamping cylinder 92 electromagnet support 94 electromagnet unit 128 linear motor Fr frame

Claims (3)

(A) a frame;
(B) a first support member fixed to the frame;
(C) a second support member fixed to the frame so as to face the first support member;
(D) a tie bar supported by the first and second support members;
(E) a first plate member attached to an end of the tie bar at a predetermined distance from the frame;
(F) a first mold attached to the first plate member;
(G) a second plate member disposed so as to freely advance and retract along the tie bar;
(H) a second mold attached to the second plate member;
(I) having a drive section for moving the second plate member forward and backward to bring the second mold into contact with and away from the first mold;
(J) The mold opening / closing apparatus, wherein the first support member slidably supports the tie bar. The mold opening and closing device according to claim 1 , wherein the first mold includes a mold member and a mold attachment member for attaching the mold member. The mold opening / closing apparatus according to claim 2 , wherein a mold mounting surface of the mold mounting member is formed to protrude from the first support member.

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