Molding device

Abstract

To provide a clamping device that can suppress the tilting of the mold plate due to the bending of the tie bars, and also prevent damage to the tie bars. [Solution] The mold clamping device (1) of the present invention comprises a front surface (11F, 12F) and a back surface (11R, 12R), and a mold plate (11, 12) that supports the mold (13, 14), Support legs (10A, 10B) on which the formwork plates (11, 12) are placed and which protrude from the front surfaces (11F, 12F) of the formwork plates (11, 12), The system includes reinforcing members (20, 30) that are fixed to the side surfaces (11S, 12S) of the formwork panels (11, 12) and also to the support legs (10A, 10B).

Description

Technical Field

[0001] The present invention relates to a mold clamping device used in an injection molding machine, a die casting machine, etc.

Background Art

[0002] An injection molding machine and a die casting machine are provided with a mold clamping device for a pair of molds including a fixed mold and a movable mold. The mold clamping device includes a fixed mold plate to which the fixed mold is attached and a movable mold plate to which the movable mold is attached. The movable mold plate can move forward and backward with respect to the fixed mold plate. After the movable mold plate is moved toward the fixed mold plate to bring the fixed mold and the movable mold into contact with each other, a mold clamping force is applied between the fixed mold and the movable mold. In this state where the mold clamping force is applied, molten resin is injected in the injection molding machine, and molten metal is press-fitted in the die casting machine.

[0003] For example, when a heavy mold is attached to the support surface of the mold plate, the center of gravity of the load obtained by adding the weights of the mold and the mold plate shifts to the side where the mold is attached rather than the center of gravity of the mold plate alone. Generally, since the mold plate is only fixed on the support legs, when a heavy mold is attached to the mold plate, the mold plate may bend or tilt. Then, the lower surface of the mold plate floats from the upper surface of the support legs, and it becomes easy for the mold plate to tilt together with the mold during mold opening / closing or mold clamping.

[0004] On the other hand, Patent Document 1 proposes a mold clamping device that can surely prevent the inclination of the mold plate, particularly the movable mold plate. The mold clamping device of Patent Document 1 is composed of a slide mechanism of the movable plate including a linear guide that slides on the bed and a tie bar guide bush that slides on the tie bar. When the mold clamping mechanism of Patent Document 1 is driven to open / close the mold, the movable mold plate slides so as to move forward and backward with respect to the fixed mold plate. At that time, the movable plate is guided not only by the linear guide but also by the tie bar guide bush, so that the inclination is surely prevented.

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] Japanese Patent Publication No. 2022-120331 [Overview of the project] [Problems that the invention aims to solve]

[0006] In the clamping device of Patent Document 1, the tie bar guide bush is provided only on the upper tie bar among the multiple tie bars. Since the tie bar guide bush is fitted into the guide hole of the movable mold platen, the movable mold platen is suspended from the upper tie bar. As a result, the tie bar bends due to the large weight of the movable mold platen, including the suspended movable mold, and its own weight. When the tie bar bends and tilts, the movable mold platen, which is substantially fixed to the tie bar in the radial direction of the tie bar by the tie bar bush, also tilts along the tie bar. In addition, the large weight of the suspended movable mold is applied to the tie bar as a bending load, so there is a risk of excessive bending stress being generated in the tie bar.

[0007] Therefore, the present invention aims to provide a clamping device that can suppress the tilting of the mold plate due to the deflection of the tie bars, as well as suppress the generation of excessive bending stress on the tie bars. [Means for solving the problem]

[0008] The clamping device of the present invention is A mold plate having a front and a back surface, with the front surface supporting the mold, Support legs on which the mold plate is placed and which protrude from the front surface of the mold plate, It comprises a reinforcing body that is fixed to the side of the mold plate and also to the support legs.

[0009] The reinforcing members are preferably, It is fixed to the support legs. Furthermore, the reinforcing members are preferably, It is installed so as to straddle the mold plate and support legs from the side.

[0010] The mold is, It is equipped with a locking body that protrudes outward in the width direction from the side, The reinforcing body is It has a locking surface against which the locking body is made to contact, The reinforcing body is It is preferable that the load is received through the locking surface, directed toward the front surface of the mold.

[0011] The reinforcing body is It comprises a base that rests on support legs, and a reinforcing wall connected to the base and fixed to the formwork, The base is, It comprises one or both of a first load-receiving piece protruding from the front side and a second load-receiving piece protruding from the back side.

[0012] A clamping force is applied to a pair of mold plates, and tie bars are provided at the four corners of the mold plates. It is preferable that the position in the height direction of the boundary between the base and the reinforcing wall is lower than the height of the apex of the tie bar, which is provided relatively below. In addition, it is preferable that the position in the height direction of the boundary between the second load-receiving piece and the reinforcing wall at the base is higher than the height of the apex of the tie bar which is provided relatively above.

[0013] The reinforcing members are preferably, It is preferable that the support legs are fixed to the back side of the mold plate, at a position away from the mold plate.

[0014] The base is, It comprises both a first load receiving piece and a second load receiving piece, It is preferable that the dimension 31F from the center of the mold thickness to the tip of the first load-receiving piece is greater than the dimension 31R from the tip of the second load-receiving piece. [Effects of the Invention]

[0015] According to the mold clamping device of the present invention, it includes a reinforcing body that is fixed to the side surface of the mold plate and supported by support legs. Thereby, according to the mold clamping device of the present invention, even if the tie bar is likely to bend, it is possible to suppress the inclination of the mold plate and in addition, prevent the tie bar from being damaged.

Brief Description of the Drawings

[0016] [Figure 1] It is a diagram showing a schematic configuration of a mold clamping device according to an embodiment. [Figure 2] It is a diagram showing a movable mold plate with a movable side reinforcing body according to the first embodiment assembled. [Figure 3] It is a diagram showing the load state in FIG. 2. [Figure 4] It is a diagram showing a preferred example in the first embodiment. [Figure 5] It is a diagram showing another preferred example in the first embodiment. [Figure 6] It is a diagram showing a modified example in the first embodiment. [Figure 7] It is a diagram showing a movable mold plate with a movable side reinforcing body according to the second embodiment assembled. [Figure 8] It is a diagram showing the load state in FIG. 7. [Figure 9] It is a diagram showing the load state of a mold plate without a reinforcing body.

Modes for Carrying Out the Invention

[0019] The fixed platen 11 is provided on one end of the base 10, and the movable platen 12A is slidable relative to the base 10 and positioned opposite the fixed platen 11. In the fixed platen 11 and the movable platen 12A, the faces that face each other are called the front faces 11F and 12F, and the faces that face the front faces 11F and 12F are called the back faces 11R and 12R.

[0020] A fixed mold 13 can be supported on the front surface 11F of the fixed mold platen 11, and a movable mold 14 can be supported on the front surface 12F of the movable mold platen 12A, and a cavity is formed between the fixed mold 13 and the movable mold 14 through which molten resin is injected. The fixed platen 11 and the movable platen 12A are connected by multiple, usually four, tie bars 15. When viewed from the front, the four tie bars 15 are positioned at the four corners of the fixed platen 11 and the movable platen 12A. A sliding member, such as the tie bar guide bush described in Patent Document 1, can be interposed between the tie bars 15 and the movable platen 12A to reduce friction between them.

[0021] The tie bar 15 has a piston 15A for generating clamping force on the side of the fixed mold plate 11, and a male thread 15B that is formed in the circumferential direction on the side of the movable mold plate 12A. Furthermore, the base 10 is provided with, for example, an electrically operated or hydraulically operated movable mold platen moving mechanism 18, which allows the movable mold platen 12A to reciprocate relative to the fixed mold platen 11. Figure 1 shows the mold closed state in which the movable mold platen 12A is moved toward the fixed mold platen 11 by the movable mold platen moving mechanism 18, and the movable mold 14 is in contact with the fixed mold 13.

[0022] The split nuts 19 are positioned on the back side 12R of the movable mold plate 12A, corresponding to each of the four tie bars 15. The split nuts 19 have a female thread 19A on their inner surface that engages with the male thread 15B of the tie bar 15.

[0023] [Fixed support leg 10A, movable support leg 10B: See Figures 1 and 2] The fixed support legs 10A support the fixed mold plate 11 and the fixed reinforcing body 20, while the movable support legs 10B support the movable mold plate 12A and the movable reinforcing body 30A. For example, the fixed support legs 10A are formed in a rectangular parallelepiped shape, and the movable support legs 10B are formed in a trapezoidal shape. Also, for example, the fixed support legs 10A are formed integrally with the base 10, and the movable support legs 10B are slidably supported on the upper surface of the base 10. Alternatively, the fixed support legs 10A and the base 10 may be manufactured as separate parts, and the fixed support legs 10A may be placed on and fixed to the base 10.

[0024] [Fixed side reinforcement 20: See Figure 1] The fixed-side reinforcing body 20 comprises a fixed-side base 21 and a fixed-side reinforcing wall 23 that extends in the height direction (H) of the fixed-side base 21. The fixed-side base 21 has a flared portion that continuously increases in length (L) from the side connected to the fixed-side reinforcing wall 23. The fixed-side reinforcing wall 23 has a rectangular shape with a constant width (W). The fixed-side base 21 and the fixed-side reinforcing wall 23 can be integrally formed by processing a plate material made of metal, or by casting a metal material. In this case, since the surface roughness of the metal material formed by casting is large and the coefficient of friction is large, if the fixed mold plate 11 is formed by casting, the frictional force with the fixed-side reinforcing body 20 formed by casting can be made large.

[0025] In the fixed-side reinforcement 20, the fixed-side base 21 rests on the fixed-side support leg 10A, and the fixed-side reinforcing wall 23 is fixed to the fixed-side plate 11 by screws or the like while in contact with the side surface 11S of the fixed-side plate 11. In the fixed-side reinforcement 20, the fixed-side base 21 has a larger longitudinal dimension (L) than the fixed-side reinforcing wall 23. This is to withstand the rotational moment generated when the fixed-side plate 11 tilts. This also applies to the movable-side reinforcing wall 33 in the movable-side reinforcement 30A.

[0026] [Movable side reinforcement 30A (first embodiment): See Figures 1, 2, and 3] The movable side reinforcing body 30A comprises a movable side base 31 and a movable side reinforcing wall 33 that extends in the height direction (H) of the movable side base 31. The movable side base 31 has a flared portion that continuously increases in width direction (W) from the side connected to the movable side reinforcing wall 33. The movable side reinforcing wall 33 has a rectangular shape with a constant width direction (W). The movable side base 31 and the movable side reinforcing wall 33 can be integrally formed by processing a plate material made of metal, or by casting a metal material. In this case, since the surface roughness of the metal material formed by casting is large and the coefficient of friction is large, if the movable mold plate 12A is formed by casting, the friction with the movable side reinforcing body 30A formed by casting can be large.

[0027] In the movable side reinforcing body 30A, the movable side base 31 is placed on the movable side support leg 10B, and the movable side reinforcing wall 33 is fixed to the movable mold plate 12A by screws or the like while in contact with the side surface 12S of the movable mold plate 12A. The surface of the movable side base 31 supported by the movable side support leg 10B is a flat surface.

[0028] The movable side reinforcing member 30A according to the first embodiment will be described in relation to the movable side support leg 10B. Here, the movable side reinforcing member 30A provided on the movable mold plate 12A will be described, but the same configuration can be adopted for the fixed side reinforcing member 20 and fixed side support leg 10A provided on the fixed mold plate 11, and the same effects can be obtained.

[0029] The movable support leg 10B comprises a mold support portion 10B1 on which the movable mold plate 12A is placed, and a reinforcing support portion 10B2 located on the outside of the mold support portion 10B1 in the width direction (W). The mold support portion 10B1 has a trapezoidal shape when viewed from the side, and the reinforcing support portion 10B2 has an upward-facing, flat support surface 10B3. Since the flat surface of the movable base portion 31 rests on the support surface 10B3 of the reinforcing support portion 10B2, the movable support leg 10B receives a rotational moment through the reinforcing support portion 10B2 that causes the movable mold plate 12A to tilt. In the case of the movable mold plate 12A, this tilt occurs toward the side of the fixed mold plate 11, i.e., toward the front (F). In the case of the fixed mold plate 11, this tilt occurs toward the side of the movable mold plate 12A, i.e., toward the rear (R).

[0030] The movable side base 31 comprises a first load-receiving piece 31A protruding from the front surface 12F and a second load-receiving piece 31B protruding from the back surface 12R. When the movable mold plate 12A attempts to tilt forward (F), a compressive force is generated in the first load-receiving piece 31A and a tensile force is generated in the second load-receiving piece 31B. These compressive and tensile forces push back the tilt of the movable side reinforcing body 30A, so they act as a reaction force when the movable mold plate 12A attempts to tilt, thereby suppressing the tilt of the movable mold plate 12A. The movable side reinforcing body 30A has a dimension L31A where the first load-receiving piece 31A protrudes forward (F) of the movable side reinforcing wall 33, which is greater than the dimension L31B where the second load-receiving piece 31B protrudes backward (R) of the movable side reinforcing wall 33. Since the first load receiving piece 31A and the second load receiving piece 31B are provided to prevent the movable form panel 12A from tilting, dimensions L31A and L31B are set so as to prevent this tilting. While a movable base 31 equipped with a first load-receiving piece 31A and a second load-receiving piece 31B is a preferred configuration, the present invention also allows for a movable side reinforcing body without the first load-receiving piece 31A and the second load-receiving piece 31B. This configuration of the movable side reinforcing body has, for example, a simple rectangular shape. Even with this configuration of the movable side reinforcing body, if it is fixed to the movable mold plate 12A and, in addition, supported and preferably fixed to the fixed side support leg 10A, it can suppress tilting of the movable mold plate 12A.

[0031] Figure 2(b) shows an example where the length (L) dimension L33 of the movable side reinforcing wall 33 is equivalent to the length (L) dimension L12 of the movable mold plate 12A in the same direction. However, as long as the objective is achieved, the dimension L33 may be larger or smaller than L12. In any case, since the movable side reinforcing wall 33 is provided to prevent the movable mold plate 12A from tilting, the dimension L33 is set so as to provide an effect of preventing tilting. Preferably, the relationship 1 / 2 × L12 ≤ L33 ≤ L12 is preferred, and more preferably, the relationship 3 / 4 × L12 ≤ L33 ≤ L12 is preferred. Furthermore, Figure 2(b) shows a preferred example in which the movable side reinforcing wall 33 covers the entire area of ​​the movable mold plate 12A in the height direction (H), but the present invention is not limited thereto. For example, it is preferable to cover at least 1 / 2 of the height direction (H) of the movable mold plate 12A, and more preferably to cover 3 / 4 of the height.

[0032] In Figure 2(b), at the position indicated by the dashed line CC, the movable platen 12A and the movable side reinforcing body 30A are preferably fixed by, for example, screws, and the movable side support leg 10B and the movable side reinforcing body 30A are fixed by, for example, screws. The screws fastening the movable platen 12A and the movable side reinforcing body 30A are made in the width direction W, passing through the movable side reinforcing body 30A, and the screws fastening the movable side support leg 10B and the movable side reinforcing body 30A are made in the height direction (H), passing through the reinforcing body support portion 10B2. Furthermore, the screw fastening between the movable support leg 10B and the movable reinforcing body 30A is not limited to the height direction (H), but may also be done through the movable reinforcing body 30A in the width direction (W). In this way, the movable plate 12A and the fixed support leg 10A are fixed by the movable reinforcing body 30A, which straddles them from the side. The dashed line CC indicates the position where the fixation takes place, and this is also applied in Figure 3 and subsequent figures.

[0033] Here, the surface roughness of the metal material formed by casting is high, resulting in a high coefficient of friction. Therefore, when the movable mold plate 12A and the movable side reinforcing body 30 are formed by casting, the frictional force generated between the movable mold plate 12A and the movable side reinforcing body 30A, which is the reaction force to the shear force generated between the movable mold plate 12A and the movable side reinforcing body 30A when the movable mold plate 12A tries to tilt forward (F), can be increased. This reduces the shear force generated in the screws that fix the movable mold plate 12A and the movable side reinforcing body 30A due to the shear force generated between the movable mold plate 12A and the movable side reinforcing body 30A, thus effectively preventing screw breakage.

[0034] As shown in Figure 3, the movable mold 14 is supported on the front surface 12F of the movable mold platen 12A. Here, although not explicitly shown in Figure 2, as shown in Figure 3(a), it is preferable to fix the second load receiving piece 31B of the movable side base 31 to the reinforcing support part 10B2 at a position located behind (R) the back surface 12R of the movable mold platen 12A.

[0035] A rotational moment M is generated in the movable mold plate 12A, which supports the movable mold 14 on its front surface 12F, due to the weight of the movable mold 14 or the combined weight of the movable mold 14 and the movable mold plate 12A, in the direction shown in Figure 3(b). Consequently, the movable mold plate 12A tends to tilt in the same direction as the rotational moment M. Note that the tilt of the movable mold plate 12A in Figure 3(b) is exaggerated. At this time, a compressive stress CS is generated at the boundary between the first load receiving piece 31A and the movable side reinforcing wall 33, and a tensile stress TS is generated in the second load receiving piece 31B. However, by fixing, for example fastening, the second load receiving piece 31B to the reinforcing support part 10B2 at a position away from the movable mold plate 12A, the rotational moment M generated in the movable mold plate 12A can be absorbed with a small fastening force, and the tilting of the movable mold plate 12A can be efficiently prevented.

[0036] In this embodiment, fixing the movable base 31 to the reinforcing support 10B2 is highly effective in preventing tilting, but fixing is not essential in the present invention. By abutting the flat lower surface of the movable base 31 with the flat upper surface of the reinforcing support 10B2 and placing the movable reinforcing 30A on the reinforcing support 10B2, the rotational moment M can be received by the reinforcing support 10B2. Therefore, tilting of the movable mold plate 12A can be suppressed even without fixing the movable base 31 to the reinforcing support 10B2. In this case, a protrusion can be provided on the bottom surface of the movable base 31, while a recess can be provided in the support surface 10B3 of the reinforcing support 10B2 into which this protrusion is inserted.

[0037] [Relationship between the movable side reinforcement 30A and the tie bar 15: See Figure 4] In this embodiment, as shown in Figure 4, it is preferable that the position in the height direction (H) of the boundary BO between the first load receiving piece 31A protruding from the front surface 12F of the movable mold platen 12A and the movable side reinforcing wall 33 does not exceed the upper end position HT of the tie bar 15. By doing so, it is possible to prevent interference with the first load receiving piece 31A when the movable mold 14 and the fixed mold 13 are moved between the movable mold platen 12A and the fixed mold platen 11 while keeping them horizontal in the width direction (W). In contrast, the second load-receiving piece 31B, which protrudes from the back surface 12R, does not need to be positioned to accommodate the loading of the movable mold 14, and can therefore be made to a height exceeding the upper end position HT of the tie bar 15. By doing so, the stress line caused by the tensile force in the height direction (H) generated in the fastening member (screw) that fixes the second load-receiving piece 31B to the reinforcing support part 10B2 at a position away from the movable mold plate 12A can be channeled from the second load-receiving piece 31B to the movable reinforcing body 30A at a high position on the movable side reinforcing wall 33. In other words, the reaction force to the rotational moment M can be generated at a position far from the reinforcing support part 10B2, which is the center of rotation. This reduces the load generated at the connection between the movable side reinforcing body 30A and the second load-receiving piece 31B, thereby increasing the resistance to the tensile stress TS (Figure 3(b)) generated in the second load-receiving piece 31B. At the same time, the direction of the stress line around the fixing point between the second load-receiving piece 31B and the reinforcing support part 10B2 becomes closer to the height direction (H). This reduces the longitudinal (L) stress component that acts as a bending element for the fastening member, thus effectively preventing damage to the fastening member. As shown in Figure 4, the four tie bars 15 are positioned at the four corners of the movable platen 12A, but the positional relationship with the boundary BO is determined only for the two tie bars 15 positioned on the lower side in the height direction (H).

[0038] The height-direction (H) relationship between the first load-receiving piece 31A and the second load-receiving piece 31B and the tie bar 15, as described above, is a preferred embodiment in the present invention, and the boundary BO between the first load-receiving piece 31A and the movable side reinforcing wall 33 can be set to a height that exceeds the upper end position HT of the tie bar 15. Even in this case, interference with the tie bar 15 can be avoided by bringing in the movable mold 14 and the fixed mold 13 from above the two tie bars positioned above the movable mold platen 12A and the fixed mold platen 11 in the height-direction (H).

[0039] [Protrusion length of the first load receiving piece 31A and the second load receiving piece 31B: See Figure 5] In this embodiment, it is preferable that the distance 31F to the tip of the first load receiving piece 31A and the distance 31R to the tip of the second load receiving piece 31B are set to 31R < 31F, with respect to the center CT of the thickness of the movable mold platen 12A. This prevents tilting of the movable mold platen 12A and also reduces the overall length of the clamping device 1 and, consequently, the injection molding machine. In other words, a predetermined gap is provided between the movable mold platen 12A and the fixed mold platen 11 in front of (F) the movable side support leg 10B is extended forward (F) within the range of that gap, and the overall length of the clamping device 1 does not increase. In contrast, if the rearward (R) dimension of the second load receiving piece 31B is long, the rearward (R) length of the movable side support leg 10B also needs to be long, which leads to an increase in the rearward (R) length of the base 10 that supports the movable side support leg 10B. This means that the overall length of the injection molding machine will be increased.

[0040] Furthermore, it is preferable that the tip of the first load-receiving piece 31A at the front (F) is positioned in front (F) of the center C14 of the movable mold 14. In this case, as shown in Figure 5, the weight of the movable mold 14 applies a rotational moment M' in the opposite direction DU to the lifting direction of the movable mold platen 12A, with the front (F) end of the first load-receiving piece 31A as the fulcrum Af. This rotational moment M' prevents the rear (R) end of the movable mold platen 12A from lifting and tilting the movable mold platen 12A forward (F).

[0041] [Modified example of the movable side reinforcement 30A: See Figure 6] The movable side reinforcing body 30A described above preferably includes a first load-receiving piece 31A and a second load-receiving piece 31B. However, in this embodiment, as shown in Figure 6(a), only the first load-receiving piece 31A can be provided without the second load-receiving piece 31B, and as shown in Figure 6(b), only the second load-receiving piece 31B can be provided without the first load-receiving piece 31A. This example applies when a small-weight movable mold 14 is supported by the movable mold platen 12A. In this modified example as well, tilting of the movable mold platen 12A can be suppressed by appropriately setting the specifications such as the dimensions of the first load-receiving piece 31A or the second load-receiving piece 31B. For a smaller-weight movable mold 14, the first load-receiving piece 31A and the second load-receiving piece 31B can be omitted, and the movable side base 31 can have the same longitudinal (L) dimensions as the movable side reinforcing wall 33.

[0042] [Effects of the first embodiment] As is known to those skilled in the art, the bending stiffness (second moment of area) of a plate material in the width direction with respect to a bending load in the width direction is proportional to the cube of the width dimension. However, if the width L33 of the movable side reinforcing body 30A (movable side reinforcing wall 33) is made to be approximately the same as the thickness L12 of the movable form plate 12A and fixed to the movable form plate 12A, the tilt of the movable form plate 12A can be effectively suppressed by the movable side reinforcing body 30A. However, if the movable side reinforcing body 30A protrudes too far from the movable form plate 12A, it may interfere with the surrounding members of the movable form plate 12A. Therefore, the width L33 is set so as not to affect the surroundings of the movable form plate 12A. Furthermore, when the movable side reinforcing body 30A is placed on the reinforcing body support part 10B2, the lower surface of the movable side reinforcing wall 33 of the movable side reinforcing body 30A is supported by the support surface 10B3, which is the upper surface of the movable side support leg 10B. Therefore, the lower surface of the movable side reinforcing body 30A, which is fixed integrally with the movable mold plate 12A, directly receives a reaction force from the support surface 10B3 of the reinforcing body support part 10B2, which has high compressive rigidity in the direction of gravity. As a result, even if the movable mold plate 12A tries to tilt due to the heavy movable mold 14, the reaction force from the support surface 10B3 effectively prevents the movable mold plate 12A from tilting. In addition, the weight of the movable side reinforcing body 30A can be supported by the highly rigid base 10 via the movable side support leg 10B.

[0043] Furthermore, when fixing the movable side reinforcing body 30A to the movable form plate 12A and the movable side support leg 10B, the movable side reinforcing body 30A can be placed on the movable side support leg 10B first, and then fixed to the movable form plate 12A and the movable side support leg 10B. Therefore, compared to fixing the movable side reinforcing body 30A while it is suspended in mid-air, this embodiment allows for safer fixing.

[0044] As shown in Figure 9, generally the mold plate (movable mold plate 12A) is only fixed to the upper surface of the support leg (movable side support leg 10B). Therefore, when a heavy mold (movable mold 14) is supported on the mold plate, a rotational moment M acts on it, causing the mold plate to tilt. This causes the lower surface of the mold plate to lift off the upper surface of the support leg, generating Ri, and the mold plate to tilt. In contrast, in this embodiment, a movable side reinforcing body 30A is fixed to the side so as to straddle the movable mold plate 12A and the movable side support leg 10B. In this case, the portion of the movable side reinforcing body 30A that is fixed to the movable side support leg 10B extends below the support surface 10B3 on which the movable mold plate 12A rests on the movable side support leg 10B. In other words, the movable side reinforcing body 30A can be fixed to the movable mold plate 12A and the movable side support leg 10B by sandwiching the lower surface of the mold plate and the upper surface of the support leg, respectively, as the mold plate tries to separate. As a result, even if the movable platen 12A tries to lift up, it can be held down by the tensile rigidity (rigidity in the height direction (H)) of the movable side reinforcing body 30A that fixes the boundary between the movable platen 12A and the movable side support leg 10B on both sides. Therefore, the movable platen 12A becomes one with the movable side support leg 10B, and the movable platen 12A is prevented from lifting off the movable side support leg 10B.

[0045] Furthermore, according to this embodiment, the clamping device 1 can be easily modified to accommodate a heavy movable mold 14 simply by assembling the newly prepared movable side reinforcing body 30A to the existing movable mold plate 12A and movable side support leg 10B. In other words, even if the clamping device has a movable side support leg that does not have a reinforcing body support part 10B2 on which the movable mold plate 12A is placed and fixed, it can be easily modified to a clamping device 1 equipped with a movable side reinforcing body 30A by replacing it with a movable side support leg 10B that has a reinforcing body support part 10B2. Examples of such clamping devices include standard specification clamping devices that have already been delivered to users or new machines.

[0046] [Second embodiment (movable side reinforcing body 30B): See Figures 7 and 8] Next, the movable panel 12B and the movable side reinforcing body 30B according to the second embodiment will be described with reference to Figures 7 and 8. The movable platen 12B and the movable side reinforcing body 30B have the same configuration as the movable platen 12 and the movable side reinforcing body 30A, and in addition, they are equipped with means that can contribute to reducing the tilt of the movable platen 12B. This means consists of a locking body 12P provided on the movable platen 12B and a locking surface 30P provided on the movable side reinforcing body 30B to which the locking body 12P is locked.

[0047] [Locking element 12P: See Figure 7] The locking element 12P is a rectangular parallelepiped element that protrudes outward in the width direction W from each side 12S of the movable platen 12B. The dimension by which the locking element 12P protrudes outward in the width direction W is arbitrary. However, in order to obtain sufficient tilt suppression effect of the movable side reinforcing body 30B on the movable platen 12B, and in order to reduce the compressive stress (surface pressure) between the movable side reinforcing body 30B and the locking element 12P when the movable platen 12B tries to tilt, it is preferable that the locking element is larger than the plate thickness of the movable side reinforcing body 30B. The rectangular parallelepiped shape is merely one example of the locking element 12P, and other shapes can be adopted as long as they can perform their function.

[0048] The locking body 12P is provided at the rear (R) end of the side surface 12S and is formed over a predetermined range extending downward from the upper end in the height direction (H) of the movable mold plate 12B. In other words, the locking body 12P is not provided near the lower end of the side surface 12S. In this case, in order to prevent the movable mold plate 12B from tilting due to the reaction force against the rotational moment M due to the weight of the movable mold 14, it is preferable that part or all of the locking body 12P is formed above the halfway point in the height direction (H) of the movable mold plate 12B. This allows the reaction force against the rotational moment M to be transmitted to the movable mold plate 12B at a position far from the reinforcing support part 10B2, which is the center of rotation, thereby reducing the load generated on the fixing bolts etc. that fix the movable side reinforcing body 30B and the reinforcing support part 10B2. The locking body 12P can be formed integrally with the movable mold plate 12B, or it can be formed by manufacturing it separately from the movable mold plate 12B and joining it to the movable mold plate 12B. Furthermore, in order to increase the strength of the connection between the locking body 12P and the movable mold plate 12B and to reduce the risk of damage to the connection between the locking body 12P and the movable mold plate 12B, it is preferable that the connection between the locking body 12P and the movable mold plate 12B be joined together over the entire surface by casting or machining, so that the locking body 12P and the movable mold plate 12B form a single integrated shape.

[0049] [Locking surface 30P: See Figure 7] The locking surface 30P is formed by cutting out a portion of the rear (R) of the movable side reinforcing body 30B. This cutout has a shape similar to the projected shape in the width direction W of the locking body 12P and originates from the rear (R) end of the movable side reinforcing wall 33. Therefore, the locking surface 30P faces rear (R).

[0050] [Assembly of the movable panel 12B and the movable side reinforcement 30B] When the movable side reinforcing body 30B is assembled to the movable mold plate 12B, the locking body 12P abuts against the locking surface 30P of the movable side reinforcing body 30B. The locking body 12P and the locking surface 30P do not need to be joined together; contact is sufficient. The relationship between the movable mold plate 12B and the movable side reinforcing body 30B is the same as that between the movable mold plate 12 and the movable side reinforcing body 30A, so the description is omitted.

[0051] [Effects of the second embodiment: See Figure 8] In the second embodiment, the locking body 12P protruding in the width direction W from the movable platen 12B and the movable side reinforcing body 30B are directly supported by each other. Therefore, when the movable platen 12B tries to tilt forward (F), the reaction force from the movable side support legs 10B can be resisted not only by the friction of the contact surface between the movable side reinforcing body 30B and the movable platen 12B, and by the rigidity of the locking body 12P, which is part of the movable platen 12B, as well as by the friction of the fixing bolts and positioning pins of the movable side reinforcing body 30B. This reduces the shear force generated in the fixing bolts and positioning pins of the movable side reinforcing body 30B. Thus, according to the second embodiment, damage to the fixing bolts and positioning pins can be prevented. Furthermore, since the rotational moment due to the reaction force from the movable support leg 10B can be directly applied to the movable mold plate 12B via the locking body 12P in the same plane as the reaction force, the reaction force from the movable support leg 10B can be transmitted to the movable mold plate 12B without loss. For this reason, it is preferable that the movable reinforcing body 30B is made of a thick flat plate that bends in the thickness direction, making it less likely for the reaction force to be lost.

[0052] In the second embodiment, it is preferable to have a structure in which the movable side reinforcing wall 33 is pressed against the locking body 12P provided on the back surface 12R of the movable platen 12A. This ensures that the locking body 12P and the locking surface 30P are in firm contact, which is effective in preventing the movable platen 12 from tilting. As an example of this pressing structure, the combination of a locking body 12P and a locking surface 30P provided on the back surface 12R can also be provided on the front surface 12F. However, in this case, fixing such as screwing between the locking body 12 and the movable side reinforcing body 30B via the locking surface 30P provided on the front surface 12F is unnecessary. Instead, a screw hole is provided in the locking body 12, and a bolt screwed into this screw hole is used to push the locking surface 30P, which does not have a screw hole, toward the rear (R).

[0053] In addition to the above, it is possible to select or replace the configurations listed in the above embodiments, or to change them to other configurations as appropriate, as long as it does not deviate from the spirit of the present invention. [Explanation of symbols]

[0054] 1 Mold clamping device 10 bases 10A Fixed side support leg 10B Movable side support leg 10B1 Mold plate support part 10B2 Reinforcement support section 10B3 Support surface 11 Fixed platen 11th and 12th floors (front side) 11R, 12R reverse side 12A, 12B movable mold board 12th Floor Front Side 12R Reverse Side 12P locking body 12S side 13 Fixed mold 14. Movable mold 15 Tie Bar 15A Piston 15B Split Nut 18 Movable mold platen moving means 20 Fixed-side reinforcing body 21 Fixed side base 23 Fixed side reinforcing wall 30A, 30B Movable side reinforcement body 30P locking surface 31 Movable side base 31A 1st load receiver 31B 2nd load receiver 33 Movable side reinforcement wall BO boundary CT center M, M' rotational moment Af fulcrum TS tensile stress CS compressive stress

Claims

1. A mold plate having a front surface and a back surface, the front surface supporting the mold, Support legs on which the mold plate is placed and which protrude from the front surface of the mold plate, The system comprises a reinforcing body fixed to the side surface of the mold and supported by the support legs, Mold clamping device.

2. The reinforcing member is, The support legs are fixed to the aforementioned support legs. The clamping device according to claim 1.

3. The reinforcing member is, The mold plate and the support legs are provided so as to straddle each other from the side. A clamping device according to claim 1 or claim 2.

4. The aforementioned panel type is The locking body is provided that protrudes outward in the width direction from the aforementioned side surface, The reinforcing member is, The locking body is provided with a locking surface against which it is in contact, The reinforcing member is, The locking surface receives a load directed toward the front surface side of the mold. The clamping device according to claim 1.

5. The reinforcing member is, It comprises a base that rests on the support legs, and a reinforcing wall connected to the base and fixed to the mold plate, The aforementioned base is, It comprises one or both of the following: a first load-receiving piece protruding from the front side and a second load-receiving piece protruding from the back side. The clamping device according to claim 1.

6. A clamping force is applied to the pair of mold plates, and tie bars are provided at the four corners of the mold plates. The position in the height direction of the boundary between the first load-receiving piece and the reinforcing wall at the base is lower than the height of the apex of the tie bar which is provided relatively below. The clamping device according to claim 5.

7. The position in the height direction of the boundary between the second load-receiving piece and the reinforcing wall at the base is higher than the height of the apex of the tie bar which is provided relatively above. The clamping device according to claim 6.

8. The reinforcing member is, The support legs are fixed to the back side of the mold plate at a position away from the mold plate. The clamping device according to claim 1.

9. The aforementioned base is, The device comprises both the first load receiving piece and the second load receiving piece, The dimension 31F from the center of the mold plate in the thickness direction to the tip of the first load-receiving piece is greater than the dimension 31R from the tip of the second load-receiving piece. The clamping device according to claim 5.

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