JP4762925B2 - Clamping device for rigid injection molding machine - Google Patents

Description

  The present invention relates to a mold clamping device of a rigid injection molding machine, and more particularly to a mold clamping device of a rigid injection molding machine that opens and closes a mold by guiding a movable part with a linear guide.

  In an injection molding machine for molding a resin molded product, there is a rigid injection molding machine as a molding machine suitable for injection molding that requires opening / closing accuracy of a mold. In the solid injection molding machine, a movable part such as a movable platen for moving the movable mold moves in the vertical direction. For this reason, compared with the horizontal injection molding machine in which a movable part moves horizontally, the straightness of a movable part can be ensured easily. On the other hand, the movable part must be moved (moved upward) against gravity, and the weight of the movable part including the movable mold is limited. Therefore, the rigid injection molding machine is often used for molded products that are relatively small and require dimensional accuracy.

  In a solid injection molding machine, a fixed platen to which a fixed mold is attached is generally provided on the lower side, and a movable platen to which a movable mold is attached moves vertically with respect to the fixed platen. For example, a rigid injection molding machine configured to vertically move a movable platen along two guide posts extending vertically has been proposed (see, for example, Patent Document 1).

  In this rigid injection molding machine, two guide posts are fixed upright and fixed to a fixed platen to which a fixed mold is attached, and a rear plate is fixed to the guide post above the fixed platen. A movable platen to which the movable mold is attached is disposed between the fixed platen and the rear plate, and the movable platen is moved up and down along the guide post to open and close the mold.

  In the system in which the movable platen is guided by the guide post, there is a possibility that play may occur in the sliding portion between the guide post and the movable frame, and there is a possibility that a slight displacement may occur between the movable mold and the fixed mold. is there. In addition, the movable portion and the center of gravity of the driving portion that drives the movable portion with respect to the guide post may be biased with respect to the guide post. In such a case, the guide post may fall slightly and the horizontal position of the movable part with respect to the fixed part may be shifted. When such a position shift occurs, the dimensional accuracy of the molded product may be deteriorated.

  Therefore, in order to prevent the deterioration of the positional accuracy caused by the above-described guide post, it has been proposed to use a linear guide instead of the guide post (see, for example, Patent Document 2).

  The linear guide is a linear guide mechanism that minimizes play between the fixed rail and the movable part, and can move the movable part straight with high accuracy. Therefore, the movable mold can be moved with high positional accuracy by moving the movable platen, to which the movable mold is attached, up and down while being guided by the linear guide.

  As described above, in the rigid injection molding machine, the movable platen is disposed above the fixed platen, and the mold is opened and closed by moving the movable platen in the direction perpendicular to the fixed platen. As described above, when the movable platen is disposed above the fixed platen, an injection device is often provided on the movable platen side in order to supply the resin to be injected into the mold from above.

In addition, the rigid injection molding machine is often used for molding a precise molded product, and it is necessary to accurately measure the molten resin and inject it into the mold. For this reason, the injection device of a rigid injection molding machine is often a pre-plastic type. The pre-plastic method is a method in which a resin melted in advance by a plasticizing device is weighed in a necessary amount and supplied to a cylinder, and a plunger in the cylinder is driven to inject the molten resin from the cylinder into a mold. Therefore, the plasticizing device and the cylinder are provided on the movable platen side, and the weight of the movable part tends to increase. When the weight of the movable part increases, the guide mechanism for guiding the movement of the movable part must be made robust.
JP-A-11-170297 JP 2004-90428 A

  When a linear guide is used as the guide for the movable platen in the mold clamping device of a rigid injection molding machine, the fixed rail of the linear guide is fixed to the fixed frame on the lower side of the movable platen, and between the fixed frame and the movable platen. It becomes the structure extended to. In this case, when a load is applied to the movable part such as the movable platen from the outside, a moment load is applied to the fixed rail supported by the fixed frame in a cantilever manner. As a result, the fixed rail is inclined, and the linearity of the movable platen may be deteriorated.

  In general, the fixed rail of the linear guide is attached and fixed to the fixed frame of the injection molding machine. Generally, the fixed frame is a relatively large structure. Since the surface to which the fixed rail of the linear guide is attached is required to be horizontal or flat, it is necessary to process the fixed frame with a processing machine having high processing accuracy. Unlike a general processing machine, a processing machine that processes a large structure with high accuracy limits a processing machine for processing a fixed frame. Moreover, even if it processes using such a processing machine, it is not easy to ensure the dimensional accuracy and flatness of a mounting surface.

  The present invention has been made in view of the above-described problems, and provides a mold clamping device for a rigid injection molding machine in which a movable platen can be arranged with high positional accuracy and can be moved with high accuracy. The purpose is to provide.

In order to achieve the above-described object, according to the present invention, there is provided a mold clamping device for a rigid injection molding machine, a frame member provided around a movable portion of the mold clamping device, and a frame member and a plurality of vertical movement guide mechanism fixed Te, the movable portion is Ri vertical movable der while being guided by the vertical movement guiding mechanism, wherein the plurality of vertical movement guide mechanism is mounted to said frame member A rigid type , further comprising an inclination adjustment mechanism that is fixed to the support plate, is attached to the frame member so as to be rotatable in a vertical plane, and adjusts the inclination of the vertical movement guide mechanism. A mold clamping device for an injection molding machine is provided.

In the above-described control method of the injection molding machine, it is preferable that a machined surface is provided on the frame member as a surface for attaching the support plate, and the frame member is fixed so that the machined surface is vertical .

  According to the present invention, the movable portion including the movable platen of the mold clamping device is guided in the vertical direction by the vertical movement guide mechanism including a linear guide or the like provided inside the frame member. Since the frame member is provided on the outside of the movable part as a framework structure so as to surround the movable part, the frame member can be given rigidity to prevent bending due to the weight of the movable part and inclination of the vertical movement guide mechanism. Thus, the movable platen can be moved with high accuracy.

  A mold clamping device of a rigid injection molding machine according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram of a mold clamping device of a rigid injection molding machine according to an embodiment of the present invention. The mold clamping apparatus shown in FIG. 1 has a fixed platen 10 to which a fixed mold 11 is attached and a movable platen 12 to which a movable mold is attached. The movable platen 12 is disposed above the fixed platen 10 and is movable in the vertical direction with respect to the fixed platen 10.

  The stationary platen 10 is attached to the upper surface of the lower frame 20. The lower frame 20 is a frame-like structure in which, for example, steel square pipe members are assembled to form a rectangular parallelepiped, and a fixed plate 22 to which the fixed platen 10 is attached is provided on the upper surface thereof. A mold clamping drive unit 24 for vertically moving the movable platen 12 is provided inside the lower frame 20.

  The mold clamping drive unit 24 is attached to the lower surface of the fixed plate 22, and the mold clamping drive unit 24 itself is configured to move in a direction perpendicular to the fixed plate 22. A plurality of tie bars 26 extend from the mold clamping drive unit 24 through the fixed plate 22 and the fixed platen 10. The movable platen 12 is fixed to the upper end portion of the tie bar 26. When the mold clamping drive unit 24 is driven to move vertically with respect to the fixed plate 22, the tie bar 26 also moves vertically together with the mold clamping drive unit 24, so that the movable platen 12 fixed to the tie bar 26 is attached to the fixed plate 22. The fixed platen 10 is moved. Thereby, opening and closing of a metal mold | die and mold clamping can be performed.

  In the present embodiment, the mold clamping drive unit 24 has the same configuration as a reciprocating hydraulic cylinder, and includes a piston unit 27 and a cylinder unit 28. The piston part 27 is fixed to the lower side of the fixed plate 22, and the cylinder part 28 moves in the vertical direction. When high pressure hydraulic oil is supplied to the hydraulic chamber 28A of the cylinder portion 28 via the hydraulic passage 28a, the cylinder portion 28 moves upward. FIG. 1 shows a state where the cylinder portion has moved upward. On the other hand, when high-pressure hydraulic oil is supplied to the hydraulic chamber 28B of the cylinder portion 28 via the hydraulic passage 28b, the cylinder portion 28 moves downward.

  One end of each tie bar 26 is fixed to the cylinder portion 28, and the opposite end is fixed to the movable platen 12. Therefore, when the cylinder portion 28 moves up and down, the tie bar 26 also moves up and down, and thereby the movable platen 12 moves up and down. The above-described hydraulic drive mold clamping drive unit 24 is an example of a drive mechanism, and various drive mechanisms such as pneumatic drive, electric motor drive, and linear motor drive can be used in addition to hydraulic drive.

  The rigid injection molding machine shown in FIG. 1 has an injection device above the movable platen 12. The injection device includes a cylinder 30 (only part of which is shown) having a plunger or a screw therein, and a drive mechanism for driving the plunger or the screw. The cylinder 30 and the drive mechanism are movable in the vertical direction with respect to the movable platen 12, move the cylinder 30 with respect to the movable platen 12, and press the nozzle at the tip of the cylinder 30 against the movable mold 13 (nozzle Touch). A conventional configuration can be used for the injection device, and the description of the injection device is omitted here.

  In the present embodiment, the movable platen 12 that is a movable part of the mold clamping device is supported by the two L-shaped support plates 38 in the vicinity of the left and right sides. The L-shaped support plate 38 is attached to the upper frame 50 through a linear guide 40 and a guide support plate 42 so as to be vertically movable.

  The upper frame 50 is a frame-like structure that is firmly attached on the lower frame 20, and is a frame-like body that is assembled, for example, by a steel square pipe to form a rectangular parallelepiped by bolting or welding. In the present embodiment, two rectangular frame bodies 52 are formed by a frame member 54 such as a square pipe, and a frame member 54 serving as a beam is connected between the two frame bodies 52 to form a rectangular parallelepiped frame body. A frame 50 is formed. The upper frame 50 is attached to the lower frame 20 and constitutes a surrounding frame that integrally surrounds the rigid injection molding machine. Therefore, the rigid injection molding machine according to the present embodiment has a structure in which the mold clamping device is attached to the surrounding frame formed by the upper frame 50 and the lower frame 20.

  As described above, the pair of L-shaped support plates 38 are connected and fixed to both sides of the movable platen 12. The upper ends of the four tie bars 26 extending through the fixed platen 10 are connected and fixed to the movable platen 12. Therefore, the movable platen 12 supported by the pair of L-shaped support plates 38 can be moved vertically by moving the tie bar 26 vertically. The guide for the vertical movement at this time is performed by two linear guides 40 which are vertical movement guide mechanisms provided on each L-shaped support plate 38. The linear guide 40 is configured such that the inclination in the vertical plane is adjusted by an inclination adjusting mechanism for guiding the L-shaped support plate 38 in the vertical direction with high accuracy. Details of the linear guide 40 and the tilt adjusting mechanism will be described later.

  The movable platen 12 which is a movable part of the mold clamping device is fixed by a fixing / adjusting mechanism in a state where it is placed on a portion extending in the horizontal direction of the pair of L-shaped support plates 38. The horizontal position of the movable platen 12 with respect to the pair of L-shaped support plates 38 can be adjusted by a horizontal adjustment mechanism. Details of the leveling mechanism will be described later.

  Next, the mounting structure of the linear guide 40 will be described with reference to FIG. FIG. 2 is a perspective view showing the linear guide 40 attached to the upper frame 50 and guiding the vertical movement of the L-shaped support plate 38 and its tilt adjusting mechanism.

  Each linear guide 40 has a guide rail 40A fixed to the guide support plate 42 and a slider 40B which is a movable part fixed to the L-shaped support plate 38, and the slider 40B moves along the guide rail 40A. It is configured as follows. Although the slider 40B is fixed to the L-shaped support plate 38, FIG. 3 also shows a state in which the slider 40B is attached to the guide rail 40A for convenience of illustration.

  The upper frame 50 is a rectangular parallelepiped frame-like structure as shown in FIG. A rib 56 is joined by welding or the like between the orthogonal frame members 54, and the upper frame 50 is reinforced by the rib 56. A processing plate 58 for processing surface joining is joined to the vertical frame member 54 of the frame body 52 of the upper frame 50 by welding or the like. The processing plate 58 is a metal plate member for providing a machined surface for fixing the guide support plate 42 to the upper frame 50, and is paired with one frame body 52 while being joined to the frame body 52. The machining plate 58 is machined to form one vertical plane. The upper frame 50 is attached to the lower frame 20 so that the machining surface of the processing plate 58 is vertical.

  The guide rail 40A of the linear guide 40 is firmly fixed to the inner surface of the guide support plate 42 that is a support plate. The two guide rails 40A fixed to each guide support plate 42 need to be parallel to each other and have a constant interval. In order to attach each guide rail 40A accurately and firmly, for example, a step is provided on the inner surface of the guide support plate 42 by machining, and the guide rail 40A is fixed by pressing the guide rail 40A against the step. It can be securely attached to the guide support plate 42 with high accuracy.

  The guide support plate 42 has openings 42a and 42b serving as maintenance windows between and outside the pair of guide rails 40A. The movable platen 12 and the like in the upper frame 50 can be seen through the openings 42a and 42b, and an adjustment operation described later can be performed by inserting a tool or the like.

  The guide support plate 42 is attached to the processing plate 58 of the frame 52 and is fixed by bolts or the like. A positioning pin 59 protrudes and is fixed to one of the pair of processing plates 58 of each frame 52. On the other hand, the guide support plate 42 is provided with positioning holes 42 c at positions corresponding to the positioning pins 59. When the guide support plate 42 is attached to the processing plate 58 of the frame body 52, the guide support plate 42 is attached to the frame body 52 by fitting the positioning holes 42 c of the guide support plate 42 into the positioning pins 59 of the processing plate 58. Can be positioned. Bolt holes for fixing the guide support plate 42 are made into fool holes (a relatively large hole with respect to the diameter of the bolt), so that the guide support plate 42 is rotated slightly within the mounting surface around the positioning pin 59. Thereby, the inclination in the vertical plane of the guide rail 40A can be adjusted. Even after the guide support plate 42 is assembled, the inclination of the guide rail 40A can be adjusted by loosening the bolts and slightly rotating the guide support plate 42. Thus, the mechanism for slightly rotating the guide support plate 42 is the tilt adjusting mechanism.

  The slider 40B of the linear guide 40 is fixed to the vertical surface of the L-shaped support plate 38 with a bolt or the like. Similarly to the above-described mechanism for fixing the guide support plate 42, the slider 40B fixing mechanism is provided with a pin at one position of the slider 40B, and this pin is fitted into the positioning hole of the L-shaped support plate 38 to make one point. The slider 40B may be slightly rotated and adjusted by positioning and placing other bolt holes as stupid holes. Thereby, the slider 40B can be attached and fixed to the L-shaped support plate 38 with high accuracy.

  In the present embodiment, two sliders 40B are provided for one guide rail 40A. Thus, by providing a plurality of sliders 40B for one guide rail 40A, play in the linear guide 40 is substantially reduced, and the highly accurate guide function of the linear guide 40 is maintained for a long time. . It is preferable to increase the distance between the sliders 40B within a possible range.

  A rib 38 a is provided on the orthogonal surface of the L-shaped support plate 38. Thereby, deformation of the L-shaped support plate is suppressed, and the perpendicularity of the orthogonal surfaces is maintained. In addition, the L-type support plate 38 is provided with two horizontal adjustment plate 38b. Similar to the ribs 38a, the leveling plate 38b has a reinforcing function, but is provided for adjusting the horizontal position of the movable platen 12 described later.

  As described above, according to the present embodiment, the moving direction of the movable platen 12 by the linear guide 40 can be finely adjusted by slightly rotating the guide support plate 42 by the tilt adjusting mechanism. Therefore, when the movable platen 12 is assembled to the upper frame 50, the center axis of the movable platen 12 can be easily adjusted with high accuracy so as to coincide with the vertical direction.

  Next, a horizontal adjustment mechanism for adjusting the horizontal position of the movable platen 12 with respect to the L-shaped support plate 38 will be described with reference to FIG. FIG. 3 is a plan view of the L-shaped support plate 38 and the movable platen 12 fixed thereto. FIG. 3 shows a state in which the injection device attached above the movable platen 12 is removed. In FIG. 3, the frame member 54 of the upper frame 50 is shaded for easy identification.

  The left and right L-shaped support plates 38 are guided by four linear guides 40 provided between the left and right guide support plates 42 and are movable in the vertical direction (direction perpendicular to the paper surface). The movable platen 12 is fixed by bolts or the like in a state where it is placed on the horizontal portion of the left and right L-shaped support plates 38. The left and right L-shaped support plates 38 are fixed to both sides of the movable platen 12. Therefore, the left and right L-shaped support plates 38 and the movable platen 12 can move together.

  As shown in FIG. 1, a tie bar 26 is fixed to the lower surface side of the movable platen 12, and the movable platen 12 can be moved in the vertical direction while being guided by the linear guide 40 by moving the tie bar 26 up and down. .

  Here, the position of the movable platen 12 in the horizontal direction is determined by the attachment position to the left and right L-shaped support plates 38. Therefore, in order to make the central axis of the locating hole 12b of the movable platen 12 coincide with the central axis of the cylinder 30 of the injection device, and to make the central axis of the fixed platen 11 and the central axis of the movable platen 12 coincide, It is necessary to adjust the position.

  In the present embodiment, a horizontal adjustment mechanism is provided to adjust the horizontal position of the movable platen 12. The leveling mechanism includes a positioning portion 12a that protrudes from the left and right side portions of the movable platen 12, and bolts 36A and 36B that can slightly move and temporarily fix the positioning portion 12a.

  The positioning part 12a protrudes from the side of the movable platen 12, has an end surface 12a-1 parallel to the side of the movable platen 12, and two side surfaces 12a-2 and 12a-3 orthogonal to the end surface 12a-1. The positioning portion 12a is configured to extend between the two horizontal adjustment plate 38b of the L-shaped support plate 38. Therefore, when the movable platen 12 is placed on the horizontal portion of the L-shaped support plate 38, the end surface 12a-1 of the positioning portion 12a faces the vertical surface of the L-shaped support plate 38, and the side surfaces 12a-2, 12a- 3 is in a state of facing the horizontal adjustment plate 38b.

  A bolt 36A is screwed into a portion of the L-shaped support plate 38 facing the end surface 12a-1 of the positioning portion 12a, and a fixing nut 36C is provided on the bolt 36A. Further, a bolt 36B is screwed into a portion of the leveling plate 38b that faces the side surfaces 12a-2 and 12a-3 of the positioning portion 12a, and a fixing nut 36D is provided on the bolt 36B. It has been.

  In the horizontal adjustment mechanism configured as described above, the movable platen 12 is positioned in the extending direction of the bolt 36A by bringing the heads of the left and right bolts 36A into contact with the end surface 12a-1 of the positioning portion 12a. The movable platen 12 is positioned in the extending direction of the bolt 36B by bringing the head of 36B into contact with the side surfaces 12a-2 and 12a-3 of the positioning portion 12a. Thereby, the position of the movable platen 12 can be finely adjusted while moving in a horizontal plane orthogonal to the central axis of the movable platen 12. When the fine adjustment is completed, the bolts 36A and 36B are fixed by tightening the nuts 36C and 36D. Then, the movable platen 12 positioned in the horizontal plane is fixed to the left and right L-shaped support plates 38 with bolts or the like.

  As described above, in this embodiment, since the horizontal adjustment mechanism that finely adjusts the position of the movable platen 12 in the horizontal plane is provided, the movable platen 12 can be easily and accurately positioned. Therefore, the locate hole 12b of the movable platen 12 can be made to coincide with the center axis of the cylinder 30 of the injection device with high accuracy. Thereby, the injection nozzle of the cylinder 30 of the injection device can be accurately connected to the injection hole of the movable mold 13 attached to the movable platen 12.

  In the present embodiment, since the linear guide 40 that guides the vertical movement of the movable platen 12 is attached to the upper frame 50 that is made of a frame and has a large rigidity, the linear guide 40 can be accurately fixed, The fixed position of the guide 40 can be maintained. Therefore, the moving direction of the movable platen 12 guided by the linear guide 40 can be accurately maintained. Further, by providing a horizontal adjustment mechanism that can easily adjust the horizontal position of the movable platen 12, the horizontal position and inclination of the movable platen 12 can be adjusted more easily and with high accuracy.

It is a figure which shows schematic structure of the rigid injection molding machine by one Embodiment of this invention. It is a perspective view which shows the linear guide attached to an upper frame, and guides the perpendicular | vertical movement of an L-shaped support plate, and its inclination adjustment mechanism. It is a top view of an L type support plate and a movable platen fixed to it.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Fixed platen 11 Fixed mold 12 Movable platen 12a Positioning part 12a-1 End surface 12a-2, 12a-3 Side surface 12b Locate hole 13 Movable mold 20 Lower frame 22 Fixed plate 24 Mold clamping drive part 26 Tie bar 27 Piston part 28 Cylinder Part 28A, 28B Hydraulic chamber 28a, 28b Hydraulic passage 30 Cylinder 36A, 36B Bolt 36C, 36D Nut 38 L-type support plate 38a Rib 38b Horizontal adjustment pad 40 Linear guide 40A Guide rail 40B Slider 42 Guide support plate 42a, 42b Opening 42c Positioning hole 50 Upper frame 52 Frame body 54 Frame member 56 Rib 58 Processing plate 59 Positioning pin

Claims (5)

A mold clamping device for a rigid injection molding machine,
A frame member provided around the movable part of the mold clamping device;
A plurality of vertical movement guide mechanisms fixed to the frame member;
The movable part is vertically movable while being guided by the vertical movement guide mechanism,
The plurality of vertical movement guide mechanisms are fixed to a support plate attached to the frame member,
A mold clamping device for a rigid injection molding machine, further comprising an inclination adjusting mechanism for adjusting the inclination of the vertical movement guide mechanism by attaching the support plate to the frame member so as to be rotatable in a vertical plane. . A mold clamping device for a rigid injection molding machine according to claim 1,
A mold clamping device for a rigid injection molding machine, wherein a machined surface is provided on the frame member as a surface for attaching the support plate, and the frame member is fixed so that the machined surface is vertical. A mold clamping device for a rigid injection molding machine according to claim 1 or 2 ,
A mold clamping apparatus for a rigid injection molding machine, wherein the vertical movement guide mechanism is fixed to the frame member in a state of being opposed to the movable part. A mold clamping device for a rigid injection molding machine according to any one of claims 1 to 3 ,
Each of the vertical movement guide mechanisms includes a guide rail and a plurality of sliders movable along the guide rail. A mold clamping device for a rigid injection molding machine according to any one of claims 1 to 4 ,
The mold clamping apparatus of a rigid injection molding machine, wherein the movable part includes a movable platen, and the frame member is fixed to a fixed platen.

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