Frame of injection molding machine, and injection molding machine

Abstract

To increase rigidity and strength of a frame against a force that deforms a cross section of a beam member of the frame, which is generated when a mold is opened and closed in an injection molding machine.SOLUTION: There is provided a frame of an injection molding machine, which supports a clamping device that opens and closes a mold in a horizontal direction by moving a movable platen horizontally relative to a fixed platen, and an injection device that injects molten material, and which has a beam member in a longitudinal direction in which the fixed platen is attached. The beam member includes a plate-like first member and a gutter-like second member having an opening in an upward direction, in which the first member is joined to an upper side thereof so as to close the opening, and the beam member has a reinforcing structure that reinforces a predetermined area surrounded with the first member and the second member under the fixed platen in order to suppress deformation of the cross section of the beam member caused by opening and closing the mold.SELECTED DRAWING: Figure 10-1

Description

[Technical field]

[0001] The present invention relates to a frame for an injection molding machine and an injection molding machine. [Background technology]

[0002] Patent Document 1 describes a base frame used in an injection molding machine equipped with a mold clamping device having a platen, on which at least the mold clamping device is mounted and which supports the mold clamping device, the base frame comprising a pair of main beams positioned at intervals from each other in the width direction of the base frame and extending side by side in the longitudinal direction of the base frame, a pair of frame bases disposed at intervals from the main beams on each frame mounting surface side of the pair of main beams and extending in the longitudinal direction, and a support provided between the main beams and the frame bases. Patent Document 2 describes an injection molding machine that includes a clamping device that closes, clamps, and opens the mold device, an injection device that fills the mold device with molding material, and a frame that supports at least one of the clamping device and the injection device, the frame having a beam and a reinforcing member joined to the beam. Patent document 3 describes a base used in an injection molding machine, the main elements of which are two side frames extending parallel to the axis of a drive actuator, in which the side frames have a lower flange supported by a machine base or foundation, an upper flange arranged parallel to the lower flange, at least two webs connecting the upper flange and the lower flange, and web reinforcements fixed through these webs. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2021-160249 A [Patent Document 2] JP 2016-193519 A [Patent Document 3] JP 2019-005948 A Summary of the Invention [Problem to be solved by the invention]

[0004] In an injection molding machine, when the mold opens and closes horizontally, acceleration occurs in the mold, and the reaction force is transmitted to the fixed platen. This causes the fixed platen to generate a force that deforms the cross section of the beam member of the frame of the injection molding machine. If the cross section of the beam member is deformed by this force, it may cause vibration of the fixed platen or problems with the strength of the joints of the cross section of the beam member.

[0005] An object of the present invention is to increase the rigidity and strength of a frame against a force that deforms the cross section of a beam member of the frame, which is generated when a mold is opened and closed in an injection molding machine. [Means for solving the problem]

[0006] With this objective in mind, the present invention provides a frame of an injection molding machine that supports a clamping device that opens and closes a mold horizontally by moving a movable platen horizontally relative to a fixed platen, and an injection device that injects molten material, the frame including a longitudinal beam member to which the fixed platen is attached, the beam member having a plate-shaped first member and a second member that is a gutter-shaped member with an opening in the upward direction and is joined to the upper side of the first member so as to block the opening, and having a reinforcing structure that reinforcing a specified area surrounded by the first member and the second member below the fixed platen to suppress deformation of the cross-section of the beam member caused by the opening and closing of the mold.

[0007] First, the reinforcing structure may be a structure that reinforces a specific region by adding a reinforcing member within the specific region. In this case, the reinforcing member may be a rod-shaped member provided vertically immediately below the portion of the first member to which the load is applied. The reinforcing member may be a diagonal brace extending between the first member and a vertical member included in the second member. Furthermore, the reinforcing member may be a plate-like member provided parallel to the cross section of the beam member, and the plate-like member may be provided immediately below an attachment member for attaching the fixed platen to the first member. Furthermore, the reinforcing member may be a plurality of plate-like members provided in parallel to the cross section of the beam member and a connecting member connecting the plurality of plate-like members. Here, the plate-like member may be provided with a notch for avoiding interference with a joining member for joining the first member and the second member or a passing member that passes through the beam member in the longitudinal direction.

[0008] Secondly, the reinforcing structure may be a structure that reinforces a specific region by making the thickness of a vertical member included in the second member within the specific region greater than the thickness outside the specific region. In this case, the second member may be a member formed by joining a third member that is within the predetermined region and includes a vertical member having a first thickness, and a fourth member that is outside the predetermined region and includes a vertical member having a second thickness that is thinner than the first thickness. The joint surface between the third member and the fourth member may be provided at an angle to the longitudinal direction.

[0009] The present invention also provides an injection molding machine including a clamping device that opens and closes a mold horizontally by moving a movable platen horizontally relative to a fixed platen, an injection device that injects molten material, and a frame that supports the clamping device and the injection device, wherein the frame includes a longitudinal beam member to which the fixed platen is attached, the beam member having a plate-shaped first member and a second member that is a gutter-shaped member having an opening in the upward direction and is joined to the upper side of the first member so as to block the opening, and the injection molding machine has a reinforcing structure that reinforcing a specified area surrounded by the first member and the second member below the fixed platen to suppress deformation of the cross section of the beam member caused by opening and closing of the mold. Effect of the Invention

[0010] According to the present invention, it is possible to increase the rigidity and strength of the frame against a force that deforms the cross section of a beam member of the frame, which is generated due to opening and closing of a mold in an injection molding machine. [Brief description of the drawings]

[0011] [Figure 1] 1 is a side view of an injection molding machine to which the present embodiment is applied. [Diagram 2] FIG. 2 is an enlarged view of the area enclosed by the bold frame A in FIG. [Diagram 3] FIG. 2 is a cross-sectional view taken along line III-III of FIG. [Figure 4] FIG. 1 is a diagram showing a force transmission path when a mold is opened and closed in an injection molding machine. [Diagram 5] 11A and 11B are diagrams showing forces acting on a frame when a mold is opened and closed. [Figure 6] FIG. 13 is a diagram showing a state in which the cross section of the beam is deformed. [Figure 7] FIG. 1 illustrates a first configuration example of a first embodiment. [Figure 8] FIG. 13 illustrates a second configuration example of the first embodiment. [Figure 9] FIG. 13 illustrates a third configuration example of the first embodiment. [Figure 10-1] 13A and 13B are diagrams illustrating a fourth configuration example of the first embodiment. [Figure 10-2] 13A and 13B are diagrams illustrating a modified example of the fourth configuration example of the first embodiment. [Figure 11-1] 13A and 13B are diagrams illustrating a fifth configuration example of the first embodiment. [Figure 11-2] 13(a) to 13(c) are diagrams illustrating a reinforcing member used in a fifth configuration example of the first embodiment. [Figure 12-1] 13A and 13B are diagrams illustrating a sixth configuration example of the first embodiment. [Figure 12-2] 13(a) to 13(c) are diagrams illustrating a reinforcing member used in a sixth configuration example of the first embodiment. [Figure 13] 13(a) to 13(c) are diagrams illustrating a first configuration example of the second embodiment. [Figure 14] 13(a) to 13(d) are diagrams showing a reinforcing member used in a first configuration example of the second embodiment. [Figure 15] FIG. 1 is a diagram showing the range of influence of stress caused by a vertical load. [Figure 16] 13(a) to 13(c) are diagrams illustrating a second configuration example of the second embodiment. [Figure 17] 13(a) to 13(d) are diagrams showing a reinforcing member used in a second configuration example of the second embodiment. [Figure 18] 13 is a diagram showing the effect of saving steel material when manufacturing a box-shaped cross section of a beam according to the second configuration example of the second embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0013] [Injection molding machine configuration] FIG. 1 is a side view of an injection molding machine 1 to which the present embodiment is applied. As shown in the figure, the injection molding machine 1 includes a clamping device 10, an injection device 20, a control device 30, and a frame 40.

[0014] The mold clamping device 10 is a device for opening and closing the mold 11, and clamps the mold 11 so that the high-pressure molten material (e.g., molten resin) injected into the mold 11 does not push the mold 11 open. The mold 11 is attached to a fixed platen 12 and a movable platen 13, and opens and closes horizontally and in the longitudinal direction of the injection molding machine 1 (hereinafter simply referred to as the "longitudinal direction") in conjunction with the movement of the movable platen 13. That is, the mold 11 opens when the movable platen 13 moves toward a first side in the longitudinal direction, and closes when the movable platen 13 moves toward a second side in the longitudinal direction. The mold clamping device 10 further includes a link mechanism 14 that transmits a driving force to the movable platen 13, and a toggle support 15 that supports the link mechanism 14.

[0015] The injection device 20 is a device that injects a molten material (for example, a molten resin). The control device 30 is a device disposed inside the frame 40 and controls the mold clamping device 10 and the injection device 20 .

[0016] The frame 40 is a structure having a substantially rectangular parallelepiped framework made up of a combination of multiple columns and beams, and includes beams 50 and 60 in the longitudinal direction and columns 71 to 75 in the vertical direction. The frame 40 has a substantially rectangular shape when viewed in the longitudinal direction. That is, the beams 50 and 60 and the columns 71 to 75 may be provided on the front and rear sides, respectively, in the depth direction of the figure, that is, the short side direction of the injection molding machine 1 (hereinafter simply referred to as the "short side direction"). And, a support surface may be provided between the beam 50 on the front side and the beam 50 on the rear side. In this case, the frame 40 supports the clamping unit 10 and the injection unit 20 arranged on the upper side in the vertical direction with the support surface. The frame 40 also houses the control unit 30 inside.

[0017] Fig. 2 is an enlarged view of the inside of the bold frame A in Fig. 1. Fig. 3 is a cross-sectional view taken along line III-III in Fig. 1. The figure shows a part of the fixed platen 12 and a part of the beam 50 on the near side in the short direction. The fixed platen 12 is often attached to the frame 40 by fastening it to the beam 50 with mounting bolts 80. The beam 50 to which the fixed platen 12 is attached may have a box-shaped cross section manufactured by welding four metal sheets. Hereinafter, of these four metal sheets, the upper horizontal metal sheet is called the upper flange 51, the lower horizontal metal sheet is called the lower flange 52, and the front and back vertical metal sheets are called the webs 53.

[0018] Here, the beam 50 has a box-shaped cross section produced by welding four metal sheets together, but is not limited thereto. The beam 50 may have a box-shaped cross section produced by welding one metal sheet to a gutter-shaped member having an opening in the upward direction so that the former closes the opening of the latter. Here, the gutter-shaped member may be produced by bending one metal sheet, or may be produced by welding an L-shaped member produced by bending one metal sheet to another metal sheet. Here, the joining method is welding, but other joining methods such as bolting may also be used. In this case, the one metal sheet, i.e., the upper flange 51, is an example of a plate-shaped first member. Also, the gutter-shaped member, i.e., the member corresponding to the lower flange 52 and the web 53, is an example of a second member that is a gutter-shaped member having an opening in the upward direction and is joined to the upper side of the first member so as to close the opening. Furthermore, the web 53 is an example of a vertical member included in the second member.

[0019] [Background of this embodiment] Fig. 4 is a diagram showing the force transmission path when the mold 11 is opened and closed in the injection molding machine 1 of Fig. 1. As shown in the figure, first, acceleration occurs in the mold 11 (S1). When acceleration occurs, a reaction force is transmitted to the toggle support 15 due to a reaction (S2). Since the toggle support 15 and the fixed platen 12 are connected by a rod material called a tie bar (not shown), the force received by the toggle support 15 is transmitted to the fixed platen 12 through the tie bar (S3). Then, the force transmitted to the fixed platen 12 generates a moment in the fixed part with the frame 40 according to the distance from the fixed part with the frame 40 (S4).

[0020] Fig. 5 is a diagram showing the forces acting on the frame 40 when the mold 11 is opened or closed. The moment described in Fig. 4 is transmitted to the frame 40 as a vertical couple of forces F1 and F2 via the mounting bolts 80 for mounting the fixed platen 12 to the beams 50, as shown in the figure.

[0021] FIG. 6 is a diagram showing a state in which the cross section of the beam 50 is deformed. The cross section of the beam 50 supporting the fixed platen 12 may be deformed as shown by the force couple F1 shown in FIG. 5. That is, the upper flange 51 may be pulled upward and curved by the force couple F1, which may cause the upper part of the web 53 to deform so as to open up. On the other hand, when the force couple F2 shown in FIG. 5 is applied, the upper flange 51 may be deformed so as to curve downward (not shown). If the cross section of the beam 50 is deformed in this way, it may cause vibration problems of the fixed platen 12 and strength problems of the welded parts constituting the box-shaped cross section.

[0022] In order to suppress such deformation, it is effective to increase the thickness of the sheet metal constituting the box-shaped cross section. However, as can be seen from Figure 1, the area that supports the fixed platen 12 is very small compared to the span of the beam 50, and it is not economical to increase the thickness of the beam 50 uniformly.

[0023] Therefore, in this embodiment, a reinforcing structure is provided for the frame 40 of the injection molding machine 1 to reinforce the cross section near the fixed platen 12. This can be regarded as a reinforcing structure that reinforces a predetermined area surrounded by the first member and the second member under the fixed platen in order to suppress deformation of the cross section of the beam member caused by opening and closing the mold. Here, when reinforcing the cross section, it is preferable to selectively reinforce the predetermined area surrounded by the first member and the second member under the fixed platen rather than reinforcing the entire area. Here, selective reinforcement means that, for example, in the case of reinforcing the cross section by adding a reinforcing member, the reinforcing member is not arranged over the entire length of the predetermined area, but is arranged only in a part of the predetermined area, and there is an area where the reinforcing member is not arranged. Note that the selective arrangement location is preferably an area where the fixed platen is in contact, and when there are areas where the fixed platen is joined and not joined within the contact area, such as when the fixed platen is fixed by a bolt or the like, it is preferable that the selective arrangement location overlaps with the joined area. When there are multiple joined areas, it is preferable that one end and the other end overlap.

[0024] The concept behind selectively reinforcing the cross section near the fixed platen 12 is as follows. First, considering how force is transmitted when no reinforcement is provided, a vertical load is applied to upper flange 51, and this load is transmitted to web 53 as bending (out-of-plane load).

[0025] However, bending tends to cause larger deformation and stress than tension (in-plane load). Therefore, the force is transmitted to the web 53 as tension (in-plane load) rather than as bending (out-of-plane load). In this case, the reinforcing structure is not the entire region within the specified region, but is a structure that reinforces the specified region by selectively adding reinforcing members to only a part of the specified region, not the entire region.

[0026] As described above, it is effective to increase the thickness of the metal plate, but since the above-mentioned deformation is localized, it is less economical to increase the thickness uniformly. Therefore, instead of increasing the thickness uniformly, only the thickness of the metal plate under the fixed platen 12 is increased. In this case, the reinforcing structure is a structure that reinforces the specified area by making the thickness of the vertical member included in the second member within a specified area thicker than the thickness outside the specified area.

[0027] Hereinafter, the former reinforcing structure will be described as a first embodiment, and the latter reinforcing structure will be described as a second embodiment.

[0028] [First embodiment] FIG. 7 illustrates a first configuration example of the first embodiment. As shown in the figure, in this first configuration example, a bundle-shaped member 54 is provided immediately below the portion of the upper flange 51 to which a load is applied. In this case, the load applied to the upper flange 51 is transmitted as shown by the thick arrow B1. Note that the bundle-shaped member 54 and the lower flange 52 cannot be welded together, but may be joined by other methods (for example, bolts). The bundle-shaped member 54 is an example of a rod-shaped member provided vertically immediately below the portion of the first member to which a load is applied.

[0029] FIG. 8 illustrates a second configuration example of the first embodiment. As shown in the figure, in this second configuration example, a front diagonal brace 55 is provided between the upper flange 51 and the front web 53, and a rear diagonal brace 55 is provided between the upper flange 51 and the rear web 53. In this case, the load applied to the upper flange 51 is transmitted as shown by the thick arrow B2. That is, although the provision of the diagonal brace 55 can be expected to be effective, each web 53 receives the load at one point, and therefore is bent, so the effect is limited. The diagonal brace 55 is an example of a diagonal brace provided between the first member and a vertical member included in the second member.

[0030] FIG. 9 illustrates a third configuration example according to the first embodiment. As shown in the figure, in this third configuration example, a partition wall 56, which is a plate-like member, is provided so as to contact the upper flange 51, the front web 53, and the rear web 53. In this case, the load applied to the upper flange 51 is transmitted as shown by the thick arrow B3. That is, by providing the partition wall 56, it is possible to transmit the force to the web 53 and the lower flange 52 as an in-plane load. The reason there is a gap between the partition wall 56 and the lower flange 52 is that the construction sequence in which the partition wall 56 is welded to the upper flange 51 and the web 53 first, and then the lower flange 52 is joined thereto, is taken into consideration. The partition wall 56 is an example of a plate-like member provided parallel to the cross section of a beam member.

[0031] 10-1(a) and 10-1(b) are diagrams illustrating a fourth configuration example of the first embodiment. As shown in the figure, in this fourth configuration example, one or more partition walls 57, which are plate-like members, are provided midway along the box-shaped cross section of the beam 50 in a direction parallel to the box-shaped cross section.

[0032] The position of the partition wall 57 is not limited, but a position close to the mounting bolt 80 provides a high reinforcing effect. Specifically, in FIG. 10-1(a), the partition wall 57a is provided directly below the mounting bolt 80a, and the partition wall 57c is provided directly below the mounting bolt 80c. In other words, no partition wall is provided directly below the mounting bolt 80b. This is because the couple of forces transmitted to the frame 40 via the mounting bolts 80a and 80c is greater than the couple of forces transmitted to the frame 40 via the mounting bolt 80b. The partition wall 57 is an example of a plate-like member provided parallel to the cross section of the beam member. This configuration is an example of a configuration in which the plate-like member is provided directly below the mounting member for attaching the fixed platen to the first member. Similarly, when the fixed platen 12 is fixed to the frame 40 using four or more mounting bolts 80, it is effective to place the partition walls 57 directly below the mounting bolts 80 at both ends.

[0033] As shown in FIG. 10-1(b), the partition wall 57 is provided with a notch 571 for avoiding interference with the weld beads constituting the box-shaped structure, and a notch 572 for avoiding interference with the mounting bolts 80. However, the objects for avoiding interference are not limited to the weld beads and the mounting bolts 80, and may be other joining members. Furthermore, the partition wall 57 may be provided with a notch 574 for avoiding interference with passing members such as piping and wiring that pass through the beam 50 in the longitudinal direction. This configuration is an example of a configuration in which the plate-shaped member is provided with a notch for avoiding interference with a joining member for joining the first member and the second member, or a passing member that passes through the beam member in the longitudinal direction.

[0034] As shown in Fig. 10-1(b), the position of the mounting bolt 80 (load application point) is not necessarily the center of the cross section, so the reinforcement does not have to be symmetrical on the front and back sides. For example, a reinforcing member may be provided on only one side of the mounting bolt 80. For example, as shown in FIG. 10-2, when the mounting bolt 80 of the fixed platen 12 is located at a position offset from the center of the cross section of the beam 50 toward one of the webs 53, the forces F1 and F2 in FIG. 5 are mainly transmitted to the lower part of the frame 40 by the web 53 closer to the mounting bolt 80. In this case, as shown in FIG. 10-2(b), a reinforcing member 575 is joined only to the web 53 farther from the mounting bolt 80, and the web 53 bears the force, so that the deformation and stress of the web 53 closer to the mounting bolt 80 can be alleviated. In this case, the reinforcing member 575 may be cut in an area where no force flows, taking into consideration the flow of force in FIG. 9. In addition, if the thickness of the web 53 to which the reinforcing member 575 is joined is greater than the thickness of the other web 53, the force can be more effectively borne. In this case, the thickness of the web 53 may be increased according to the second embodiment described later.

[0035] 11-1(a) and (b) are diagrams illustrating a fifth configuration example of the first embodiment. As shown in the figure, in this fifth configuration example, two or more partition walls 58 are provided in the box-shaped cross section of the beam 50, and the partition walls 58 are connected to each other by a connecting plate 59, which is a plate-like member in the longitudinal direction. Specifically, in FIG. 11-1(a), the partition wall 58a is provided on a first side in the longitudinal direction from directly below the mounting bolt 80a, and the partition wall 58c is provided on a second side in the longitudinal direction from directly below the mounting bolt 80c, and the partition walls 58a and 58c are connected by the connecting plate 59. In this fifth configuration example, when a partition wall cannot be provided directly below the mounting bolt 80, an improvement in the reinforcing effect can be expected. The partition walls 58a and 58c are an example of a plurality of plate-like members provided in parallel to the cross section of the beam member, and the connecting plate 59 is an example of a connecting member that connects the plurality of plate-like members.

[0036] Also, in this fifth configuration example, as shown in FIG. 11-1(b), the partition wall 58 may be provided with a notch 581 to avoid interference with the welding beads forming the box-shaped structure. However, the object to avoid interference is not limited to the welding beads, and may be other joining members. Further, notches may be provided separately from the notch 581 in the partition wall 58 to avoid interference with the passing members passing through the beam 50, such as pipes and wirings, in the longitudinal direction. This configuration is an example of a configuration in which the plate-shaped member is provided with notches to avoid interference with the joining members for joining the first member and the second member or the passing members passing through the beam member in the longitudinal direction.

[0037] Furthermore, in this fifth configuration example, although not shown, the connecting plate 59 may be provided with notches to avoid interference with the joining members such as welding beads or the passing members such as pipes and wirings.

[0038] FIGS. 11-2(a) to (c) are diagrams showing the reinforcing members used in the fifth configuration example of the first embodiment. FIG. 11-2(a) shows the partition wall 58 viewed from the longitudinal direction. FIG. 11-2(b) shows the connecting plate 59 viewed from the short-side direction. FIG. 11-2(c) shows the reinforcing member connecting the partition walls 58a and 58c and the connecting plate 59 viewed from the upper side in the vertical direction. Also in this configuration example, similar to the fourth configuration example, the reinforcing member may have an asymmetric shape instead of the symmetric shape as shown in FIGS. 11-2(a) to (c).

[0039] FIGS. 12-1(a) and (b) are diagrams showing the sixth configuration example of the first embodiment. As shown in the figure, in this sixth configuration example, two or more partitions 61 are provided in the box-shaped cross-section of the beam 50, and the partitions 61 are connected by a connecting plate 62 to form a U-shape. Specifically, in Fig. 12-1(a), a partition 61a is provided on the first side in the longitudinal direction below the mounting bolt 80a, and a partition 61c is provided on the second side in the longitudinal direction below the mounting bolt 80c, and the partition 61a and the partition 61c are connected by a connecting plate 62. Further, due to this U-shaped structure, the upper flange 51 and one web 53 are connected. In this sixth configuration example, when a partition cannot be installed directly below the mounting bolt 80, an improvement in the reinforcement effect can be expected. The partitions 61a and 61c are an example of a plurality of plate-like members provided parallel to the cross-section of the beam member, and the connecting plate 62 is an example of a connecting member that connects a plurality of plate-like members.

[0040] Also, in this sixth configuration example, as shown in Fig. 12-1(b), the partition 61 may be provided with a notch 611 to avoid interference with the welding bead that forms the box-shaped structure. However, the object to avoid interference is not limited to the welding bead, and may be other joining members. Further, for the partition 61, notches may be provided separately from the notch 611 to avoid interference with passing members such as pipes and wirings that pass through the beam 50 in the longitudinal direction. Alternatively, the notch 611 may also serve as a notch for avoiding interference with passing members such as pipes and wirings that pass through the beam 50 in the longitudinal direction. This configuration is an example of a configuration in which the plate-like member is provided with notches for avoiding interference with a joining member for joining the first member and the second member or a passing member that passes through the beam member in the longitudinal direction.

[0041] Furthermore, in this sixth configuration example, although not shown, the connecting plate 62 may be provided with notches for avoiding interference with joining members such as welding beads or passing members such as pipes and wirings.

[0042] Figs. 12-2(a) to (c) are diagrams showing a reinforcing member used in the sixth configuration example of the first embodiment. Fig. 12-2(a) shows the partition wall 61 viewed from the longitudinal direction. Fig. 12-2(b) shows the connecting plate 62 viewed from the short-side direction. Fig. 12-2(c) shows a reinforcing member connecting the partition walls 61a and 61c and the connecting plate 62 viewed from above in the vertical direction.

[0043] As described above, in the injection molding machine 1 according to the first embodiment, the upper flange 51, the lower flange 52, and the web 53 that constitute the beam 50 are reinforced by adding the bundled member 54, the cross rib 55, the partition walls 56, 57, 58, and the connecting plate 59, or the partition walls 61 and the connecting plate 62. As a result, with respect to the force that deforms the cross section of the beam 50 of the frame 40 caused by the opening and closing of the mold 11 in the injection molding machine 1, it has become possible to increase the rigidity and strength of the frame 40 without changing the existing members that constitute the frame 40.

[0044] [Second Embodiment] Figs. 13(a) to (c) are diagrams showing the first configuration example of the second embodiment. As shown in the figure, in this first configuration example, the web 53 of the box-shaped cross-section of the beam 50 is fabricated not by using a single sheet of sheet metal, but by butt-welding two sheets of sheet metal with different thicknesses. Specifically, in Fig. 13(a), the thickness of the web 531 below the mounting bolt 80 is made thicker than the thickness of the web 532 not below the mounting bolt 80, and these are butt-welded at the joint surface 533. This can be understood from the fact that in the beam 50 viewed from the first side in the longitudinal direction in Fig. 13(b), the thicker web 531 can be seen inside the thinner web 532. In addition, in the beam 50 viewed from the second side in the longitudinal direction in Fig. 13(c), the thinner web 532 is hidden behind the thicker web 531 and cannot be seen. By thickening the web 53 partially in this way, even when it is not possible to install a partition wall, it can be reasonably reinforced. Also, here, the joining method of the web 531 and the web 532 is butt-welding, but other joining methods may also be used. The web 531 is within a predetermined region and is an example of a third member including a vertical member with a first thickness, and the web 532 is outside the predetermined region and is an example of a fourth member including a vertical member with a second thickness thinner than the first thickness. And the web 53 fabricated by butt-welding the web 531 and the web 532 is an example of a member in which the third member and the fourth member are joined.

[0045] Figs. 14(a) to (d) are diagrams showing the reinforcing members used in the first configuration example of the second embodiment. Fig. 14(a) shows the front-side webs 531 and 532 viewed from the short-side direction. Fig. 14(b) shows the front-side webs 531 and 532 viewed from the first side in the longitudinal direction. Fig. 14(c) shows the front-side webs 531 and 532 (the web 532 is not visible) viewed from the second side in the longitudinal direction. Fig. 14(d) shows the front-side webs 531 and 532 viewed from the upper side in the vertical direction. The web 531 and the web 532 are joined at the joint surface 533.

[0046] Fig. 15 is a diagram showing the influence range of the stress caused by the vertical load. As shown by the hatched area R1 in the figure, the range of influence of the vertical load from the mounting bolt 80 gradually expands as it is transmitted to the foundation through the box-shaped cross section. Therefore, if the length of the thickened portion of the web 531 is made the same on the upper and lower sides as in the first configuration example, there is a possibility that the thickness of a part of the upper side (for example, the area R2 surrounded by the dashed line) will not be effectively utilized.

[0047] 16(a) to (c) are diagrams illustrating a second configuration example of the second embodiment. Based on the consideration of FIG. 15, in this second configuration example, the joint surface where two metal plates with different thicknesses are butt-welded is inclined with respect to the longitudinal direction. Specifically, in FIG. 16(a), the thickness of the web 534 under the mounting bolt 80 is made thicker than the thickness of the web 535 not under the mounting bolt 80, and these are butt-welded at the joint surface 536 provided at an angle with respect to the longitudinal direction. Note that the beam 50 viewed from the first side in the longitudinal direction in FIG. 16(b) and the beam 50 viewed from the second side in the longitudinal direction in FIG. 16(c) are the same as those in FIG. 13(b) and (c) even though the joint surface is inclined. This configuration is an example of a configuration in which the joint surface between the third member and the fourth member is provided at an angle with respect to the longitudinal direction.

[0048] 17(a) to (d) are diagrams showing a reinforcing member used in a second configuration example of the second embodiment. FIG. 17(a) shows the front side webs 534, 535 as viewed from the short side. Here, in the web 531 of the first configuration example, the lower side length L is left as it is, and the upper side length S is subtracted to obtain (LS). The front side webs 534, 535 as viewed from the first side in the longitudinal direction in FIG. 17(b) and the front side webs 534, 535 as viewed from the second side in the longitudinal direction in FIG. 17(c) are the same as those in FIG. 14(b) and (c) even if the joint surface is inclined. FIG. 17(d) shows the front side webs 534, 535 as viewed from above in the vertical direction. The webs 534 and 535 are joined at a joint surface 536. In FIG. 17(a), the joint surface 536 is inclined with respect to the longitudinal direction, but in FIG. 17(d), only the uppermost portion of the joint surface 536 in the vertical direction is visible.

[0049] FIG. 18 is a diagram showing the effect of steel material savings when manufacturing the box-shaped cross-section of the beam 50 according to the second configuration example of the second embodiment. As described above, in the web 534 of the second configuration example, one of the upper length and the lower length is shorter by S than the web 531 of the first configuration example. Therefore, considering that two webs of the same dimensions are required to manufacture one box-shaped cross-section, in the second configuration example, compared with the first configuration example, it is possible to save the amount of steel material corresponding to the region R3 surrounded by the broken line in the figure.

[0050] In addition, in the second embodiment, the web 53 is made of two sheet metals with different thicknesses, but this is not limitative. The web 53 may be made of one sheet metal, and the thickness of the sheet metal may be locally increased.

[0051] As described above, in the injection molding machine 1 according to the second embodiment, the thickness of the web 531 or the web 534, which is one of the two divided webs 53, is increased in the upper flange 51, the lower flange 52, and the web 53 that constitute the beam 50, thereby reinforcing the beam 50. As a result, it is possible to increase the rigidity and strength of the frame 40 without adding a new member constituting the frame 40 against the force that deforms the cross-section of the beam 50 of the frame 40 caused by the opening and closing of the mold 11 in the injection molding machine 1.

[0052] [Other Embodiments] Although the embodiment of the present invention has been described above, the present invention is not limited to the above-mentioned embodiment. Moreover, the effects of the present invention are not limited to those described in the above-mentioned embodiment. For example, the external configuration of the injection molding machine 1 in Figs. 1 to 3 is not limited to this. Moreover, each aspect of the bundle member 54 in Fig. 7, the brace 55 in Fig. 8, the partition wall 56 in Fig. 9, the partition wall 57 in Figs. 10-1(a) and (b), the reinforcing member 575 in Figs. 10-2(a) and (b), the partition wall 58 and the connecting plate 59 in Figs. 11-1(a), (b) and Figs. 11-2(a) to (c), and the partition wall 61 and the connecting plate 62 in Figs. 12-1(a), (b) and Figs. 12-2(a) to (c) are merely examples for achieving the object of the present invention, and are not particularly limited. Furthermore, each embodiment of webs 531, 532 in Figures 13(a)-(c) and Figures 14(a)-(d) and webs 534, 535 in Figures 16(a)-(c) and Figures 17(a)-(d) is merely an example for achieving the objects of the present invention, and is not particularly limited.

[0053] [summary] The frame 40 of the injection molding machine 1 and the injection molding machine 1 in this embodiment need only have the following configuration, and can take on a variety of different embodiments. That is, the frame 40 of the injection molding machine 1 in this embodiment supports the clamping device 10 that opens and closes the mold 11 horizontally by moving the movable platen 13 horizontally relative to the fixed platen 12, and the injection device 20 that injects molten material. The frame 40 of the injection molding machine 1 includes a longitudinal beam 50 to which the fixed platen 12 is attached, and the beam 50 has a plate-shaped first member (e.g., an upper flange 51) and a second member (e.g., a member consisting of a lower flange 52 and a web 53) that is a gutter-shaped member having an opening in the upward direction and is joined to the upper side of the first member (e.g., the upper flange 51) so as to block the opening, and has a reinforcing structure that reinforcing a predetermined area surrounded by the first member (e.g., the upper flange 51) and the second member (e.g., a member consisting of the lower flange 52 and the web 53) below the fixed platen 12 to suppress deformation of the cross section of the beam 50 caused by the opening and closing of the mold 11. This makes it possible to increase the rigidity and strength of the frame 40 against a force that is generated due to the opening and closing of the mold 11 in the injection molding machine 1 and that deforms the cross section of the beams 50 of the frame 40 .

[0054] First, the reinforcing structure may be a structure that reinforces a specific region by adding a reinforcing member within the specific region. This makes it possible to increase the rigidity and strength of the frame 40 against forces that deform the cross-section of the beam 50 of the frame 40 caused by the opening and closing of the mold 11 in the injection molding machine 1, without making any changes to the existing components that make up the frame 40.

[0055] In this case, the reinforcing member may be a rod-shaped member (for example, bundle-shaped member 54) provided vertically directly below the portion of the first member (for example, upper flange 51) to which the load is applied. This allows the force that deforms the cross section of the beam 50 of the frame 40, which is generated due to the opening and closing of the mold 11 in the injection molding machine 1, to be transmitted to the lower flange 52, thereby increasing the rigidity and strength of the frame 40.

[0056] The reinforcing member may be a brace 55 extending between the first member (eg, upper flange 51) and a vertical member (eg, web 53) included in the second member. This allows the force that deforms the cross section of the beams 50 of the frame 40, which is generated due to the opening and closing of the mold 11 in the injection molding machine 1, to be transmitted to the webs 53, thereby increasing the rigidity and strength of the frame 40.

[0057] Furthermore, the reinforcing member may be a plate-like member (eg, partitions 56, 57) provided parallel to the cross section of the beam 50. This allows the force that deforms the cross-section of the beam 50 of the frame 40, which occurs due to the opening and closing of the mold 11 in the injection molding machine 1, to be transmitted to the web 53 and the lower flange 52 as an in-plane load, thereby increasing the rigidity and strength of the frame 40.

[0058] The plate-like members (eg, partitions 57a, 57c) may be provided immediately below the mounting members (eg, mounting bolts 80a, 80c) for mounting the stationary platen 12 to the first member (eg, upper flange 51). This makes it possible to further increase the rigidity and strength of the frame 40 against a force that is generated due to the opening and closing of the mold 11 in the injection molding machine 1 and that deforms the cross section of the beams 50 of the frame 40 .

[0059] Furthermore, the reinforcing member may be a plurality of plate-shaped members (e.g., partitions 58a, 58c, 61a, 61c) arranged parallel to the cross section of the beam 50 and connecting members (e.g., connecting plates 59, 62) connecting the plurality of plate-shaped members (e.g., partitions 58a, 58c, 61a, 61c). This enables the rigidity and strength of the frame 40 to be further increased against forces that deform the cross-section of the beam 50 of the frame 40 caused by the opening and closing of the mold 11 in the injection molding machine 1, even if the plate-shaped members (e.g., partitions 58a, 58c, 61a, 61c) cannot be located directly below the mounting members (e.g., mounting bolts 80a, 80c).

[0060] Here, the plate-like member may be provided with notches 571, 572, 574, 581, 611 to avoid interference with a joining member for joining a first member (e.g., upper flange 51) and a second member (e.g., a member consisting of lower flange 52 and web 53) or a passing member passing longitudinally through beam 50. This increases the rigidity and strength of the frame 40 against forces that deform the cross section of the beam 50 of the frame 40 caused by the opening and closing of the mold 11 in the injection molding machine 1, without interfering with the joining member for joining the first member (e.g., the upper flange 51) and the second member (e.g., a member consisting of the lower flange 52 and the web 53) or the passing member that passes longitudinally through the beam 50.

[0061] Secondly, the reinforcing structure may be a structure that reinforces a specific region by making the thickness of a vertical member (e.g., web 53) included in the second component thicker within the specific region than the thickness outside the specific region. This makes it possible to increase the rigidity and strength of the frame 40 against forces that deform the cross-section of the beam 50 of the frame 40 due to the opening and closing of the mold 11 in the injection molding machine 1, without adding new components that constitute the frame 40.

[0062] In this case, the second member may be a member formed by joining a third member (e.g., web 531, 534) that is within the specified region and includes a vertical member of a first thickness, and a fourth member (e.g., web 532, 535) that is outside the specified region and includes a vertical member of a second thickness that is thinner than the first thickness. This makes it possible to easily manufacture members for increasing the rigidity and strength of frame 40 against forces that deform the cross section of beam 50 of frame 40 due to opening and closing of mold 11 in injection molding machine 1.

[0063] A joint surface 536 between the third member (for example, web 534) and the fourth member (for example, web 535) may be provided at an angle to the longitudinal direction. This makes it possible to conserve steel used to manufacture components for increasing the rigidity and strength of frame 40 against forces that deform the cross-section of beam 50 of frame 40 caused by the opening and closing of mold 11 in injection molding machine 1.

[0064] In addition, the injection molding machine 1 in this embodiment includes a clamping device 10 that opens and closes the mold 11 horizontally by moving the movable platen 13 horizontally relative to the fixed platen 12, an injection device 20 that injects molten material, and a frame 40 that supports the clamping device 10 and the injection device 20, in which the frame 40 includes a longitudinal beam 50 to which the fixed platen 12 is attached, and the beam 50 has a plate-shaped first member (e.g., an upper flange 51) and a second member (e.g., a member consisting of a lower flange 52 and a web 53) that is a gutter-shaped member having an opening in the upward direction and is joined to the upper side of the first member (e.g., the upper flange 51) so as to close the opening, and has a reinforcing structure that reinforcing a predetermined area surrounded by the first member (e.g., the upper flange 51) and the second member (e.g., a member consisting of the lower flange 52 and the web 53) below the fixed platen 12 in order to suppress deformation of the cross section of the beam 50 caused by the opening and closing of the mold 11. This makes it possible to increase the rigidity and strength of the frame 40 against a force that is generated due to the opening and closing of the mold 11 in the injection molding machine 1 and that deforms the cross section of the beams 50 of the frame 40 . [Explanation of symbols]

[0065] 1... injection molding machine, 10... mold clamping device, 11... mold, 12... fixed platen, 13... movable platen, 14... link mechanism, 15... toggle support, 20... injection device, 30... control device, 40... frame, 50, 60... beam, 51... upper flange, 52... lower flange, 53, 531, 532, 534, 535... web, 533, 536... joint surface, 54... bundle-shaped member, 55... diagonal brace, 56, 57, 58, 61... partition wall, 59, 62... connecting plate, 71, 72, 73, 74, 75... column, 80... mounting bolt

Claims

1. A frame of an injection molding machine that supports a clamping device that opens and closes a mold horizontally by moving a movable platen horizontally relative to a fixed platen, and an injection device that injects molten material, a longitudinal beam member to which the stationary platen is attached; The beam member is The device includes a plate-like first member and a second member which is a gutter-like member having an opening in an upward direction and is joined to an upper side of the first member so as to close the opening, A frame of an injection molding machine having a reinforcing structure that reinforcing a specified area surrounded by the first member and the second member below the fixed platen to suppress cross-sectional deformation of the beam member caused by opening and closing the mold.

2. 2. The frame of the injection molding machine according to claim 1, wherein the reinforcing structure is a structure that reinforces the predetermined area by adding a reinforcing member within the predetermined area.

3. 3. The frame of the injection molding machine according to claim 2, wherein the reinforcing member is a rod-shaped member provided vertically immediately below a portion of the first member to which the load is applied.

4. 3. The frame of the injection molding machine according to claim 2, wherein the reinforcing member is a diagonal brace extending between the first member and a vertical member included in the second member.

5. 3. The frame of the injection molding machine according to claim 2, wherein the reinforcing member is a plate-like member provided parallel to a cross section of the beam member.

6. 6. The frame of the injection molding machine according to claim 5, wherein the plate-like member is provided immediately below an attachment member for attaching the stationary platen to the first member.

7. 3. The frame of the injection molding machine according to claim 2, wherein the reinforcing member comprises a plurality of plate-like members provided in parallel to a cross section of the beam member and a connecting member connecting the plurality of plate-like members.

8. A frame of an injection molding machine as described in any one of claims 5 to 7, wherein the plate-like member is provided with a notch to avoid interference with a joining member for joining the first member and the second member or a passing member passing longitudinally through the beam member.

9. 2. The frame of an injection molding machine as described in claim 1, wherein the reinforcing structure is a structure that reinforces the specified area by making the thickness of a vertical member included in the second member within the specified area thicker than the thickness outside the specified area.

10. 10. The frame of the injection molding machine according to claim 9, wherein the second member is a member formed by joining a third member that is within the specified area and includes a vertical member having a first thickness, and a fourth member that is outside the specified area and includes a vertical member having a second thickness that is thinner than the first thickness.

11. The frame of the injection molding machine according to claim 10 , wherein a joint surface between the third member and the fourth member is provided at an angle to a longitudinal direction.

12. An injection molding machine including a mold clamping device that opens and closes a mold horizontally by moving a movable platen horizontally relative to a fixed platen, an injection device that injects molten material, and a frame that supports the mold clamping device and the injection device, The frame is a longitudinal beam member to which the stationary platen is attached; The beam member is The device includes a plate-like first member and a second member which is a gutter-like member having an opening in an upward direction and is joined to an upper side of the first member so as to close the opening, an injection molding machine having a reinforcing structure that reinforcing a specified area surrounded by the first member and the second member below the fixed platen to suppress deformation of the cross section of the beam member caused by opening and closing the mold.

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