Molding device

Abstract

To provide a mold clamping apparatus which comprises platens with a split structure in which, even the platens exceed the restriction of a size in conveyance if it is a monolithic structure, the size can be stayed within the restriction of a predetermined cargo size by splitting them into plural members.SOLUTION: A mold clamping apparatus 1 comprises: plural tie bars 3 for generating mold clamping force in a fixed mold 13 and a movable mold 23 via a fixed platen 10A (10B) and a movable platen 20; a toggle link mechanism 50 for generating elastic force in the plural tie bars 3; and an end platen 30 for supporting the toggle link mechanism 50. The end platen 30 of the mold clamping apparatus 1 is assembled with two tie bar support bodies 303, 305 in a crossed manner. The tie bar support bodies 303, 305 include: two support parts 303A, 305A through which the tie bar 3 passes; and connection parts 303, 305C for connecting the two support parts 303A, 305A.SELECTED DRAWING: Figure 7

Description

[[Technical Field]]

[0001] The present invention relates to a mold clamping device used in die-casting apparatuses and injection molding machines. [[Background Art]]

[0002] In die-casting apparatuses and injection molding machines, a mold clamping mechanism that closes, clamps and opens a movable mold mounted on a movable platen relative to a fixed mold mounted on a fixed platen causes these two molds to open and close, and applies a clamping force to the closed molds. Then, an injection mechanism injects and fills molten light metal or resin into a mold cavity formed inside the clamped mold, and after the light metal or resin in the mold cavity cools and solidifies, the two molds are opened to obtain a molded product of a desired shape.

[0003] When a die-casting apparatus is shipped, although restrictions vary depending on transportation means (airplanes, ships, railways, automobiles, etc.) and transportation methods, laws and regulations set restrictions on the weight and size of cargo. Therefore, when transporting the die-casting apparatus from a manufacturing factory to a customer's factory, the mold clamping mechanism is divided into appropriate units. Each unit is transported as cargo packed in a state that does not exceed the weight and size limits predetermined by laws and other regulations.

[0004] Particularly, exceeding the weight and size limits of cargo is a concern for the size of cargo in the case of land transportation carried by loading the cargo onto an automobile and traveling on roads. Note that restrictions on the size of cargo for land transportation using automobiles are stipulated in the Road Traffic Act and other regulations.

[0005] In the case of ultra-large die-casting equipment with a clamping force of 40,000 kN (4,000 tons) or more, which is a typical specification item for clamping devices, the tie bar internal dimensions, which indicate the spacing between horizontal and vertical tie bars, that is, the platen dimensions in both length and width, become large. Therefore, especially in land transport using automobiles, it is necessary to keep the length and width of the platen within a limited range, but if the capacity of the die-casting equipment is prioritized during the design phase, it can be difficult to obtain a platen with length and width dimensions within the limited range.

[0006] Platens, including fixed platens, movable platens, and end platens (also called end platens), are manufactured as integrally cast metal structures by casting, as disclosed in, for example, Patent Document 1. Cast iron is selected as the material for these cast platens, and more specifically, spheroidal graphite cast iron is used exclusively. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2016-22658 [Patent Document 2] Japanese Patent Publication No. 2009-12271 [Overview of the project] [Problems that the invention aims to solve]

[0008] To transport platens exceeding legal limits by automobile, it is assumed that the platen will be divided to fit within the limits. Patent Document 2 proposes dividing a fixed platen into three components: a tie bar connecting member, a mold mounting plate, and a clamping force transmission plate. However, although the tie bar connecting member in Patent Document 2 is thin-walled, its length and width are equivalent to that of a platen with a single-piece structure. Therefore, even in Patent Document 2, it is not possible to reliably fit into cargo size limits when dealing with ultra-large die-casting equipment with a clamping force of 40,000 kN or more.

[0009] Therefore, the present invention aims to provide a clamping device equipped with a platen with a divided structure that can be divided into multiple units to fit within predetermined cargo size limits, while also ensuring the strength required for clamping. [Means for solving the problem]

[0010] The clamping device of the present invention comprises a fixed platen that supports a fixed mold, a movable platen that is movable forward and backward relative to the fixed platen and supports a movable mold, a plurality of tie bars that generate clamping force between the fixed mold and the movable mold via the fixed platen and the movable platen, a toggle link mechanism that generates elastic force in the plurality of tie bars, and an end platen that supports the toggle link mechanism. At least one of the fixed platen, movable platen, and end platen is assembled with two tie bar supports that intersect. The tie bar support comprises two support parts through which the tie bar passes, and a connecting part that connects the two support parts.

[0011] Preferably, each tie bar support has a fitting groove at least on one of its connecting portions, and the two tie bar supports are fitted together at the portion of the fitting groove.

[0012] Another form of a fixed platen with a segmented structure is one in which a fixed plate to which a fixed mold is attached and four tie bar supports are assembled, and the four tie bar supports can be arranged to surround the periphery of the fixed plate. In this case, at least one of the movable platen and the end platen will have a configuration in which two tie bar supports are assembled in an intersecting manner.

[0013] Another form of a movable platen having a segmented structure is one in which a fixed plate to which a movable mold is attached and two tie bar supports are assembled, and the two tie bar supports can be positioned along each of the two opposing sides of the fixed platen. In this case, at least one of the fixed platen and the end platen will have a configuration in which the two tie bar supports are assembled in an intersecting manner. [Effects of the Invention]

[0014] According to the present invention, by dividing the cargo into multiple units, it is possible to keep it within the predetermined size limits of the cargo, while also ensuring the strength required for clamping. [Brief explanation of the drawing]

[0015] [Figure 1] This figure shows a schematic configuration of a clamping device as an example. [Figure 2] The main part of a mold clamping device is shown, which includes a fixed platen 10 with a segmented structure, a movable platen 20, and an end platen 30. (a) shows the mold clamping state with the toggle link mechanism extended, and (b) shows the mold open state with the toggle link mechanism retracted. [Figure 3] This figure shows an example of a fixed platen in an assembled state with a segmented structure. [Figure 4] This diagram shows the fixed platen in sections, as shown in Figure 3. [Figure 5] This figure shows an example of a movable platen in an assembled state with a segmented structure. [Figure 6] This diagram shows the movable platen in sections, as shown in Figure 5. [Figure 7] This figure shows an example of an end platen in an assembled state with a segmented structure. [Figure 8] This figure shows the end platen of Figure 7 in sections. [Figure 9] This figure shows another example of a fixed platen in an assembled state having a segmented structure. [Figure 10] This diagram shows the fixed platen in sections, as shown in Figure 9. Mode for Carrying Out the Invention

[0016] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the following description, an example of a mold clamping device 1 including an integrated fixed platen 110, a movable platen 120, and an end platen 130 will be described with reference to FIG. 1, and then a split-type fixed platen 10A, 10B, a movable platen 20, and an end platen 30 will be described with reference to FIGS. 2 to 10.

[0017] [Schematic configuration of mold clamping device 1: FIG. 1] As shown in FIG. 1, the mold clamping device 1 mainly includes a fixed platen 110 and a movable platen 120 which are provided in parallel spaced apart from each other in the mold opening / closing direction x so as to be parallel to each other. The mold clamping device 1 also includes a toggle link mechanism 50 that generates a mold clamping force to the fixed platen 110 and the movable platen 120, and an end platen 130 that supports the toggle link mechanism 50 together with the movable platen 120. The fixed platen 110, the movable platen 120, and the end platen 130 are placed on a machine base 2 installed on the floor in a state where tie bars 3 are penetrated through four corners of each platen. Hereinafter, each component will be described in order. In the mold clamping device 1, a mold opening / closing direction x and a height direction y are specified as shown in FIG. 1.

[0018] [Fixed platen 110 and movable platen 120: FIG. 1] As shown in FIG. 1, opposing surfaces of the fixed platen 110 and the movable platen 120 constitute mold mounting surfaces 11 and 21, respectively. A fixed mold 13 is supported on the mold mounting surface 11 of the fixed platen 110, and a movable mold 23 is supported on the mold mounting surface 21 of the movable platen 120. The fixed platen 110 is fixed in position relative to the machine base 2, while the movable platen 120 is mounted on the machine base 2 so as to be able to move back and forth in the mold opening / closing direction x relative to the fixed platen 110. The end platen 130 is slidably mounted on the machine base 2. The end platen 130 is driven by the mold thickness drive unit 35 and guided by the tie bar 3, and together with the movable platen 120 and the toggle link mechanism 50 described later, it can move on the machine base 2 in the mold opening / closing direction x.

[0019] In the fixed platen 110, approximately in the center of the back side of the mold mounting surface 11, an injection hole is formed into which an injection nozzle and injection sleeve of an injection device (not shown) can be inserted. The movable platen 120 and the end platen 130 are connected by a toggle link mechanism 50. By extending and bending the toggle link mechanism 50, the movable platen 120 moves closer to or further away from the fixed platen 110 in the mold opening / closing direction x.

[0020] [Toggle link mechanism 50: Figure 1] As shown in Figure 1, the toggle link mechanism 50 includes a pair of upper and lower link members 51 spanning between the movable platen 120 and the end platen 130, and a crosshead 62 that moves in the mold opening / closing direction x to extend and retract the pair of upper and lower link members 51. The toggle link mechanism 50 also includes a crosshead drive device 70 that moves the crosshead 62 in the mold opening / closing direction x.

[0021] Each link member 51 is equipped with a toggle link 54, one end of which is pivotably connected to the platen-side link support member 52 of the movable platen 120 by a link pin 55. Each link member 51 is also equipped with a mid-link 58, one end of which is pivotably connected to the housing-side link support member 56 of the end platen 130 by a link pin 59. The other end of the toggle link 54 and the other end of the mid-link 58 are pivotably connected to each other by a link pin 61.

[0022] The crosshead 62 is located between a pair of upper and lower midlinks 58, 58. One end of the crosshead link 63 is pivotably connected to both ends of the crosshead 62 by a link pin 64, and the other end of the crosshead link 63 is pivotably connected to the midlinks 58, 58 by a link pin 65. Although the crosshead link 63 is connected to the midlink 58 by a link pin 65 as described above, the system is not limited to this. For example, the crosshead link 63 may be connected to the midlink 58 and the link pin 61 of the toggle link 54. Thus, the connection position of the crosshead link 63 is appropriately selected during the design stage of the toggle link mechanism 50, such as the toggle magnification and the opening / closing stroke. The link member 51 is configured such that the toggle link 54 and the mid link 58 swing around their respective link pins 55 and 59, causing the crosshead 62 to move in the mold opening / closing direction x, thereby extending or bending.

[0023] As shown in Figure 1, the crosshead drive unit 70 includes a ball screw nut 71 embedded in the crosshead 62 and a ball screw shaft 72 that is rotatably mounted through the end platen 130 and into which the ball screw nut 71 is screwed. The crosshead drive unit 70 also includes a chain sprocket 73 attached to the base end of the ball screw shaft 72 and a clamping motor 74 attached to the side of the end platen 130 opposite to the mounting surface of the toggle link mechanism 50. The crosshead drive unit 70 also includes a motor sprocket 75 attached to the rotating shaft of the clamping motor 74 and a chain 76 stretched between the chain sprocket 73 and the motor sprocket 75. The rotational force of the clamping motor 74 is transmitted to the ball screw shaft 72 via the chain 76.

[0024] [Tie bar 3: Figure 1] Multiple tie bars, typically four, are stretched across the four corners of the fixed platen 110, the movable platen 120, and the end platen 130, as shown in Figure 1, and their elastic force generates clamping force on the fixed mold 13 and the movable mold 23 via the fixed platen 110 and the movable platen 120. Fixed nuts 15 are provided at the four corners of the back surface of the mold mounting surface 11 of the fixed platen 110, which engage with one end of each tie bar 3. These fixed nuts 15 restrict the relative movement of each tie bar 3 in the mold opening / closing direction x, and the rotational movement of each tie bar 3 around its longitudinal central axis. Drive nuts 31 are provided at the four corners of the back surface of the end platen 130, which engage with threaded portions (not shown) formed on the other end of each tie bar 3. These drive nuts 31 are rotatably supported by the end platen 130 and are rotated by the mold thickness drive unit 35, which advances the threaded portions of each tie bar 3. As a result, the end platen 130, the toggle link mechanism 50 connected thereto, and the movable platen 120 are configured to reciprocate in the mold opening / closing direction x.

[0025] [Mold thickness drive unit 35: Figure 1] As shown in Figure 1, the die height drive unit 35 includes, for example, a die height motor 36 mounted on the upper surface of the end platen 130 and a motor sprocket 38 mounted on the rotating shaft of the die height motor 36. The die height drive unit 35 also includes chain sprockets 40 mounted around each of the four drive nuts 31 and a transmission gear 42 rotatably mounted on the surface of the end platen 130 opposite to the mounting surface of the toggle link mechanism 50. Furthermore, the die height drive unit 35 includes a chain 44 stretched between the motor sprocket 38 and the transmission gear 42, and a chain (not shown) stretched between the four chain sprockets 40 and the transmission gear 42. The die height drive unit 35 transmits the rotational force of the die height motor 36 to each drive nut 31 via the chain 44 and the like.

[0026] [Explanation of example division structure: Figures 2-10] <Main parts of the clamping device: Figure 2> The main components of the clamping device 1, which uses a fixed platen 10A, a movable platen 20, and an end platen 30 having a segmented structure, will be described with reference to Figure 2. The movable platen 20 moves back and forth between a position where it approaches the fixed platen 10A for mold closing and clamping (Figure 2(a)) and a position where it moves away from the fixed platen 10A for mold opening (Figure 2(b)), in accordance with the extension and retraction of the toggle link mechanism 50. When clamping force is generated in the fixed mold 13 and the movable mold 23, the fixed platen 10A, the movable platen 20, and the end platen 30 are subjected to mechanical loads from the tie bars 3 that pass through them. This load extends not only in the mold opening / closing direction x, but also in the height direction y and the width direction z. Furthermore, the fixed platen 10A is connected to the tie bar 3 via a fixing nut 15, and the end platen 30 is connected to the tie bar 3 via a drive nut 31. Therefore, the fixed platen 10A and the end platen 30 are subjected to a greater degree of load from the elastic force generated in the tie bar 3 compared to the movable platen 20. For this reason, in the following embodiments, a divided structure is selected according to the degree of this load.

[0027] The fixed platen 10A, movable platen 20, and end platen 30 have a segmented structure that allows them to have a clamping force of 40,000 kN or more while remaining within the specified cargo size limits. The segmented structure of the fixed platen 10A, movable platen 20, and end platen 30 will be described below in that order.

[0028] <Fixed platen 10A: Figures 3 and 4> The segmented structure of the fixed platen 10A will be explained with reference to Figures 3 and 4. The fixed platen 10A has a five-part structure composed of five components. However, four of the five components have the same shape and dimensions, and together they consist of two types of components. One of these is the fixed plate 101, which has the mold mounting surface 11 described above, and the other is the tie bar support 103. The fixed plate 101 and the tie bar support 103 are each made of a casting obtained by integrally casting the metal material described above. The elements that make up the movable platen 20 and the end platen 30 are also the same.

[0029] The fixing plate 101 has a rectangular, or more particularly square, shape when viewed from the front, and comprises a first surface 101A which constitutes the mold mounting surface 11 provided on one side, and a second surface 101B on the back side thereof where the tie bar support 103 is arranged. The fixing plate 101 is provided with chamfers 101C at each of its four corners, which are formed continuously from the first surface 101A to the second surface 101B to avoid interference with the tie bars 3. For example, the chamfers 101C have an arc-shaped recessed structure, but other chamfer structures such as C-chamfers can be adopted. The fixing plate 101 is provided with an injection hole 101D that penetrates from the first surface 101A to the second surface 101B, into which an injection nozzle or injection sleeve (not shown) is inserted. For example, the injection hole 101D is positioned below the center of the fixing plate 101 when viewed from above. The fixing plate 101 is also provided with two positioning members 101E that position and align the four tie bar supports 103 that rise from the side of the second surface 101B. Each of the two positioning members 101E has a rectangular parallelepiped shape provided along two opposing sides 101S. The positioning element 101E is provided between two chamfers 101C aligned in the width direction W, such that the center of the edge 101S coincides with the center of the width direction W.

[0030] The tie bar support 103 comprises a support portion 103A, each having a through hole 103B into which a tie bar 3 is inserted, and a connecting portion 103C that connects the two support portions 103A. In plan view, for example, the support portion 103A is circular and the connecting portion 103C is rectangular. The thickness of the support portion 103A and the connecting portion 103C of the tie bar support 103 is the same as that of the positioning member 101E.

[0031] The fixing plate 101 and the four tie bar supports 103 are assembled as follows. Two of the tie bar supports 103 are positioned with a positioning member 101E in between and in contact with the second surface 101B. These two tie bar supports 103 are aligned with the height direction H. The other two tie bar supports 103 are aligned with the width direction W and are superimposed so that the positions of the connecting portions 103C provided at both ends coincide with the tie bar supports 103 aligned with the height direction H. In this way, the four tie bar supports 103 are assembled in a grid pattern around the periphery of the fixing plate 101. As shown in Figure 4(b), the fixing platen 10A, to which the fixing plate 101 and tie bar supports 103 are assembled, has a first surface 101A that constitutes the mold mounting surface 11 protruding a small amount from the tie bar supports 103. Furthermore, on the second surface 101B of the fixed platen 10A, a rectangular void is formed in plan view, surrounded by four tie bar supports 103, and an injection nozzle and injection sleeve, which are not shown in the figure, are partially housed in this void. In the fixed platen 10A, the fixed plate 101 and the four tie bar supports 103 can be joined at the points where they meet by conventionally known means such as welding or fastening. The same applies to the movable platen 20 and the end platen 30.

[0032] As described above, the fixed platen 10A is divided such that the four tie bar supports 103 that receive the load from the tie bars 3 are arranged along the height direction H and the width direction W. Therefore, the fixed platen 10A can withstand loads from both the height direction H and the width direction W from the tie bars 3.

[0033] If the fixed platen 10A, consisting of the fixed plate 101 and the tie bar support 103, were formed as a single unit, it might exceed the specified cargo size limit. However, by adopting a structure that divides the fixed platen 10A into the fixed plate 101 and the tie bar support 103, each component of the fixed platen 10A, the fixed plate 101 and the tie bar support 103, can be kept within the specified cargo size limit.

[0034] <Movable platen 20: Figures 5 and 6> Next, the segmented structure of the movable platen 20 will be explained with reference to Figures 5 and 6. The movable platen 20 has a three-part structure composed of three components. However, two of the three components have the same shape and dimensions, and together they consist of two types of components. One of these is the fixed plate 201 which has the mold mounting surface 21 described above, and the other is the tie bar support 203.

[0035] The fixing plate 201 has a rectangular, or more particularly square, shape when viewed from the front, and comprises a first surface 201A which constitutes a mold mounting surface 21 provided on one side, and a second surface 201B on the back side thereof where the tie bar support 203 is arranged. The fixing plate 201 has chamfers 201C at each of its four corners, which are formed continuously from the first surface 201A to the second surface 201B, to avoid interference with the support portion 203A of the tie bar support 203. The fixing plate 201 also has four platen-side link support members 52 that rise from the side of the second surface 201B. Each of the four platen-side link support members 52 is connected to the toggle link 54 via a link pin 55.

[0036] The tie bar support 203 has the same structure and dimensions as the tie bar support 103, and each includes a support portion 203A in which a through hole 203B into which the tie bar 3 is inserted is formed, and a connecting portion 203C that connects the two support portions 203A.

[0037] The fixing plate 201 and the two tie bar supports 203 are assembled as follows. The fixing plate 201 is supported by two tie bar supports 203 on two sides 201D that face each other in the height direction H. Each support portion 203A of the tie bar support 203 is positioned on a chamfer 201C.

[0038] As described above, the movable platen 20 is divided such that the tie bar support 203, which receives the load from the tie bar 3, is positioned only along the width direction W. Therefore, the movable platen 20 can receive the load in the width direction W from the tie bar 3 with the tie bar support 203, but the load in the height direction H is received at the joint surface between the fixed plate 201 and the tie bar support 203.

[0039] If the movable platen 20, with its fixed plate 201 and tie bar support 203, were formed as a single unit, it might exceed the specified cargo size limit. However, by adopting a structure that divides the movable platen 20 into the fixed plate 201 and tie bar support 203, each of the components of the movable platen 20, the fixed plate 201 and the tie bar support 203, can be kept within the specified cargo size limit.

[0040] <End platen 30: Figures 7 and 8> The segmented structure of the end platen 30 will be explained with reference to Figures 7 and 8. The end platen 30 has a two-part structure composed of two similar components. Specifically, the end platen 30 is assembled by fitting and intersecting two tie bar supports 303 and tie bar support 305 together. The tie bar supports 303 and tie bar support 305 have the same basic shape and dimensions, but when assembled, the orientation in which the housing-side link support member 56 rises is the same.

[0041] The tie bar support 303 comprises a support portion 303A, each having a through hole 303B into which a tie bar 3 is inserted, and a connecting portion 303C that connects the two support portions 303A. In plan view, for example, the support portion 303A is circular and the connecting portion 303C is rectangular. The connecting portion 303C has a first surface 303D and a second surface 303E that face each other. The tie bar support 303 has a fitting groove 303F in the longitudinal center of the connecting portion 303C for fitting with the tie bar support 305. The fitting groove 303F is formed as a rectangular parallelepiped recess extending from the first surface 303D to the second surface 303E of the connecting portion 303C. The tie bar support 303 includes a housing-side link support member 56 rising from the first surface 303D. For example, a pair of housing-side link support members 56 are provided at a predetermined distance apart. The housing-side link support member 56 is connected to the mid link 58 via a link pin 59.

[0042] The tie bar support 305 comprises a support portion 305A, each having a through hole 305B into which a tie bar 3 is inserted, and a connecting portion 305C that connects the two support portions 305A. In plan view, for example, the support portion 305A is circular and the connecting portion 305C is rectangular. The connecting portion 305C has a first surface 305D and a second surface 305E that face each other. The tie bar support 305 has a fitting groove 305F in the longitudinal center of the connecting portion 305C for fitting with the tie bar support 303. The fitting groove 305F is formed as a rectangular parallelepiped recess extending from the second surface 303E to the first surface 305D of the connecting portion 305C. The tie bar support 305 includes a housing-side link support member 56 rising from the first surface 305D. For example, a pair of housing-side link support members 56 are provided at a predetermined distance apart. The housing-side link support member 56 is connected to the mid link 58 via a link pin 59.

[0043] The tie bar support 303 and tie bar support 305 are fitted together at the fitting grooves 303F and 305F, respectively, so that they intersect with each other when assembled. In other words, the fitting grooves 303F and 305F are responsible for the relative positioning of the tie bar support 303 and tie bar support 305. When the tie bar support 303 and tie bar support 305 are assembled, for example, the first surface 303D and the first surface 305D become flush, and the second surface 303E and the second surface 305E become flush.

[0044] As described above, the end platen 30 is divided such that the tie bar supports 303, which receive the load from the tie bar 3, are positioned to intersect in both the height direction H and the width direction W. Therefore, the end platen 30 can receive the load from the tie bar 3 in the height direction H and the width direction W with the two intersecting tie bar supports 303 and 305.

[0045] If the end platen 30 were formed integrally by casting the tie bar support 303 and tie bar support 305, it might exceed the specified cargo size limit. However, by adopting a structure in which the end platen 30 is divided into the tie bar support 303 and tie bar support 305, each of the tie bar support 303 and tie bar support 305, which are components of the end platen 30, can be kept within the specified cargo size limit.

[0046] [Effects of adopting a segmented structure] According to this embodiment, even in the case of an extra-large die-casting apparatus with a clamping force of 40,000 kN or more, the fixed platen 10A, the movable platen 20, and the end platen 30 are each divided into multiple components. The size of the divided components can then be kept within a predetermined limit on the size of the cargo, making land transport by automobile possible. Furthermore, by employing a segmented platen as in this embodiment, a clamping device can be obtained that is not restricted by the size limitations imposed by land transport using automobiles.

[0047] [Effects due to differences in structural division] The fixed platen 10A and end platen 30 can withstand loads from both the height direction H and the width direction W from the four tie bars 3 using the tie bar supports 103 and 303, 305. In contrast, the movable platen 20 can withstand the load in the width direction W from the tie bars 3 using the tie bar support 203, but the load in the height direction H is received at the joint surface between the fixed platen 201 and the tie bar support 203. Here, the load-bearing strength of the joint surface is inferior to that of the tie bar supports 103, 203, 303, 305, which are a single integrated member. Therefore, the segmented structure of the movable platen 20 is structurally inferior to the segmented structure of the fixed platen 10A and end platen 30. However, the movable platen 20 receives a smaller load from the tie bars 3 than the fixed platen 10A and end platen 30. Therefore, the movable platen 20 is designed to receive the load in the height direction H at the joint surface between the fixed plate 201 and the tie bar support 203, instead of receiving it at the tie bar support 203.

[0048] The movable platen 20 consists only of a fixed plate 201 and two tie bar supports 203, whereas the fixed platen 10A uses four tie bar supports 103 arranged in a grid pattern to withstand loads from both the height direction H and the width direction W, making the movable platen 20 structurally simpler than the fixed platen 10A. The end platen 30, by having two tie bar supports 303 and 305, can withstand loads from both the height direction H and the width direction W with the tie bar supports 303 and 305, thus surpassing the fixed platen 10A in both strength and number of components. However, the movable platen 20 can also employ a split structure in which two tie bar supports intersect, similar to the end platen 30.

[0049] In addition to the above, the configurations listed in the above embodiments can be selected or modified as appropriate, as long as they do not deviate from the spirit of the present invention. A modified example that reduces the number of components constituting the fixed platen from five to three will be explained with reference to Figures 9 and 10. The modified fixed platen 10B has a three-part structure composed of three members. However, two of the three members have the same shape and dimensions, and together they consist of two types of members. One of these is the fixed plate 101 which has the mold mounting surface 11 described above, and the other is the tie bar support 103. Note that components that are the same as those of the fixed platen 10A described earlier are given the same reference numerals as those of the fixed platen 10A, and their descriptions may be omitted.

[0050] The fixed plate 101 is equipped with a nozzle tube 101F that corresponds to the injection hole 101D. The nozzle tube 101F rises from the second surface 101B. The fixed plate 101 does not have a positioning member 101E, but the nozzle tube 101F serves as a substitute for the positioning member 101E. In other words, the two tie bar supports 103 are positioned relative to the fixed plate 101 by inserting the nozzle tube 101F into both cylindrical holes 103J of the two tie bar supports 103.

[0051] The tie bar support 103 has a connecting portion 103C with a first surface 103D and a second surface 103E that face each other. The tie bar support 103 has a fitting groove 103F in the longitudinal center of the connecting portion 103C for fitting with the other tie bar support 103. The fitting groove 103F is formed as a rectangular parallelepiped recess extending from the first surface 103D to the second surface 103E of the connecting portion 103C. The tie bar support 103 has a protruding edge 103G. The protruding edge 103G protrudes from one side surface 103H of the connecting portion 103C, which corresponds to the fitting groove 103F. A cylindrical hole 103J is formed extending from the protruding edge 103G to the fitting groove 103F, penetrating both the front and back sides, into which the nozzle cylinder 101F is inserted.

[0052] The two tie bar supports 103 are fitted together at the portions of their respective fitting grooves 103F, 103F, thereby positioning them relative to each other and assembling them in a cross-sectional manner.

[0053] As described above, the fixed platen 10B is divided such that the tie bar support 103, which receives the load from the tie bar 3, is positioned to intersect in both the height direction H and the width direction W. Therefore, the fixed platen 10B can receive the load from the tie bar 3 in both the height direction H and the width direction W with the two tie bar support 103.

[0054] Furthermore, in the above, the fixed platens 10A, 10B, the movable platen 20, and the end platen 30 were all made into a segmented structure. However, if any of the fixed platens 10A, 10B, the movable platen 20, and the end platen 30 fit within the specified cargo size limits, that platen can be made into a single, integrated structure. In other words, in the present invention, the segmented structure may be adopted for at least one of the fixed platens 10A, 10B, the movable platen 20, and the end platen 30.

[0055] Furthermore, the end platen 30 is provided with fitting grooves 303F and 305F, and the fixed platen 10B is provided with fitting groove 103F. However, fitting grooves 303F, 305F, and 103F are optional elements. Fitting grooves 303F, 305F, and 103F can be omitted, or replaced with other elements that have a positioning function.

[0056] Furthermore, the present invention can employ other divided structures. For example, in the movable platen 20 of the form shown in Figure 5, each of the two members divided in the height direction H or width direction W in the figure can be manufactured as a single casting, and the two members can be joined together. In addition, each of the four members divided in the height direction H and width direction W can be manufactured as a single casting, and the four members can be joined together. [Explanation of symbols]

[0057] 1 Mold clamping device 2 Machine Base 3 Tie Bars 10A, 10B, 110 Fixed Platen 11 Mold mounting surface 13 Fixed mold 15 Fixing nut 20,120 Movable platen 21 Mold mounting surface 23. Movable mold 30,130 End Platen 31 Drive nut 35-type thick drive unit 36 Die Height Motor 38 Motor Sprocket 40 chain sprocket 42 Transmission gears 44 chain 50 Toggle link mechanism 51 Link member 52 Platen-side link support member 54 Toggle Links 55 Link Pins 56 Housing-side link support member 58 Midlink 59, 61 Link pins 62 Crosshead 63 Crosshead Link 64, 65 Link pins 70 Crosshead drive unit 71 Ball screw nut 72 Ball screw shaft 73 Chain sprocket 74-type clamping motor 75 Motor Sprocket 76 chain 101 Fixed plate 101A 1st page 101B 2nd page 101C Chamfer 101D injection hole 101E Positioning body 101F Nozzle Tube 101S side 103 Tie Bar Support 103A Support part 103B Through hole 103C Connection part 103D 1st page 103E 2nd side 103F Fitting groove 103G protruding edge 103H side 103J cylinder hole 201 Fixed plate 201A 1st page 201B 2nd page 201C Chamfer 201D side view 203 Tie Bar Support 203A,303A Support part 203B,303B through hole 203C,303C connection part 303D 1st page 303E 2nd side 303F Fitting groove 303,305 Tie Bar Support 305A Support part 305B Through hole 305C connection part 305D 1st page 305E 2nd side 305F Fitting groove H (height direction) W (width direction) x-shaped opening and closing direction y: Height direction z Width direction

Claims

1. A fixed platen that supports the fixed mold, A movable platen is provided so as to be movable forward and backward relative to the fixed platen, and supports the movable mold, Multiple tie bars that generate clamping force between the fixed mold and the movable mold via the fixed platen and the movable platen, A toggle link mechanism that generates elastic force in multiple tie bars, The system comprises an end platen supporting the toggle link mechanism, The aforementioned end platen is Two tie bar supports are assembled in a cross shape. The tie bar support is The tie bar passes through two support parts, It comprises a connecting portion that connects the two aforementioned support portions, At least one of the aforementioned connecting parts is provided with a rectangular parallelepiped fitting groove, A clamping device characterized in that the two tie bar supports are fitted together and assembled at the portion of the fitting groove.

2. At least one of the fixed platen and the movable platen is The two tie bar supports are assembled in a cross shape. The tie bar support is The tie bar passes through two support portions, It comprises a connecting portion that connects the two support portions, The clamping device according to claim 1.

3. The fixed platen having a divided structure, The fixing plate to which the aforementioned fixing mold is attached and the four tie bar supports are assembled together. The four tie bar supports are arranged to surround the periphery of the fixing plate. The clamping device according to claim 1.

4. The movable platen having a segmented structure, The fixed plate to which the movable mold is attached and the two tie bar supports are assembled together. The clamping device according to claim 1, wherein the two tie bar supports are arranged along each of the two opposing sides of the fixing plate.

Images