JP2006198801A - Molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a high-grade molded product by making the deformation quantities of the respective parts of die plates almost constant to uniformize the bending of the die plates with respect to the molded product in a mold clamping state, and to make the die plates as lightweight as possible while ensuring the necessary sufficient rigidity in the respective parts of the die plates. <P>SOLUTION: In this molding machine equipped with a movable die plate to which a movable mold is attached and a fixed die plate to which a fixed mold is attached, the deformation quantities of the respective parts of the movable and fixed die plates are made almost constant. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a molding machine such as an injection molding machine or a die casting machine, and more particularly to a technique related to a die plate in the molding machine.

  In a molding machine such as an injection molding machine, a movable die is attached to a movable die plate, a fixed die is attached to a fixed die plate, and the movable die plate is moved forward and backward relative to the fixed die plate. Closed (clamped) and opened, and in the mold-clamped state, in the cavity (molding space) formed by the movable side mold and the fixed side mold, the molten molding material (molten resin, die casting in the injection molding machine) The machine is designed to inject and fill molten metal.

  FIG. 3 is a perspective view showing a conventional movable die plate, and FIG. 4 is a perspective view showing a conventional fixed die plate, where a three-die plate structure and a triple toggle type toggle link mechanism are employed. An example is shown.

  In FIG. 3, 51 is a movable die plate, 52 is a link attachment part of a toggle link mechanism (not shown) on the movable die plate 51, 53 is a load cell or auxiliary attachment member (not shown) on a movable side mold (not shown). The support surface 54 of the movable die plate 51, which is attached indirectly, is a side surface of the movable die plate 51. 4, 61 is a fixed die plate, 62 is an insertion hole of a tie bar (not shown) in the fixed die plate 61, 63 is a carrying surface of the fixed die plate 61 to which a fixed die (not shown) is attached, 64 These are side surfaces of the fixed die plate 61.

  As shown in FIGS. 3 and 4, the conventional die plate (the movable die plate 51 and the fixed die plate 61) has a substantially triangular grip shape whose side surfaces 54 and 64 are simply flat. In general, the design of the conventional die plate is generally designed so that the outer shape is simple with the emphasis only on the workability.

  However, as shown in FIGS. 3 and 4, when the die plate has a simple outer shape, the deformation amount (elastic deformation amount) of each part of the die plate in the clamping state is different (stress distribution in the die plate). Will be uneven). That is, for example, in the movable die plate 51, the vicinity of the link attachment part 52 is a part that receives the tensile force of the toggle link mechanism during mold clamping. The amount of deformation is small in the middle of the attachment portion 52. In the fixed die plate 61, the vicinity of the insertion hole 62 to which one end of the tie bar is fixed is a portion that receives a contraction force from the tie bar (the restoring force of the tie bar elastically stretched by the mold clamping) when the mold is clamped. Therefore, the amount of deformation increases, whereas the amount of deformation decreases between the insertion hole 62 and the insertion hole 62. For this reason, when the mold is clamped, the deflection of the die plate becomes non-uniform with respect to the molded product, and the quality of the molded product requiring precise density distribution and precise thickness accuracy is improved. There was a problem of becoming a bottleneck in the above.

  In addition, in the prior art, since the outer shape of the die plate is a simple shape, there is a tendency that extra steel material is used in addition to a portion that requires sufficient rigidity. For this reason, the weight of the die plate There has been a problem that it has become a bottleneck in reducing the weight.

  The present invention has been made in view of the above points, and the object of the present invention is to make the deformation amount of each part of the die plate substantially constant, so that the deflection of the die plate in the clamped state becomes a molded product. On the other hand, it is to be able to obtain a high-quality molded product by making it uniform. Another object of the present invention is to reduce the weight of the die plate as much as possible while ensuring the necessary and sufficient rigidity for each part of the die plate.

  In order to achieve the above object, the present invention provides a molding machine including a movable die plate to which a movable die is attached and a fixed die plate to which a fixed die is attached. The configuration is made substantially constant by designing the amount with design support that optimizes the amount of deformation through simulation by CAE (Computer Aided Engineering).

  According to the present invention, since the deformation amount of each part of the die plate is substantially constant in the mold clamping state, the deflection of the die plate is uniform with respect to the molded product in the mold clamping state, and the density distribution accuracy In addition, it is possible to obtain a molded product having excellent thickness accuracy. In addition, simulation by CAE (Computer Aided Engineering) in conjunction with a CAD (Computer Aided Design) / CAM (Computer Aided Manufacturing) system is performed so that the amount of deformation of each part of the die plate becomes substantially constant in the mold clamping state. After that, the die plate designed with the design support that optimizes the amount of deformation (stress distribution) has the necessary and sufficient rigidity because the meat of the part exceeding the necessary and sufficient rigidity is cut off during the simulation process. While guaranteeing this, the weight of the entire die plate can be significantly reduced as compared with the prior art. In particular, in the movable die plate, the weight can be reduced by about 30 to 40% as compared with the conventional one while ensuring that the movable die plate has the same rigidity as that of the movable die plate that has been conventionally required. Therefore, high-speed response of mold opening / closing can be achieved, or downsizing of the mold opening / closing drive source can be realized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a movable die plate of a molding machine according to an embodiment of the present invention (hereinafter referred to as the present embodiment), and FIG. 2 is a perspective view of a fixed die plate of the molding machine of the present embodiment. The present embodiment is an application example when a three-die plate structure and a triple toggle type toggle link mechanism are employed.

  In FIG. 1, 1 is a movable die plate, 2 is a link attachment part of a toggle link mechanism (not shown) in the movable die plate 1, and 3 is a movable side mold (not shown) via a load cell and an auxiliary attachment member (not shown). The mounting surface 4 of the movable die plate 1 that is indirectly attached to each other, 4 is a side surface of the movable die plate 1, and 5 is a portion corresponding to an intermediate position between the adjacent link mounting portions 2 on the side surface 4. It is the hole part formed in this way. 2, 11 is a fixed die plate, 12 is an insertion hole of a tie bar (not shown) in the fixed die plate 11, 13 is a support surface of the fixed die plate 11 to which a fixed mold (not shown) is attached, 14 These are side surfaces of the fixed die plate 11.

  The movable die plate 1 and the fixed die plate 11 of the present embodiment are such that the amount of deformation of each part of the die plates 1 and 11 is substantially constant in the clamping state (the overall stress distribution is substantially uniform). The shape is determined through simulation by CAE in conjunction with the CAD / CAM system. Die plates 1 and 11 designed with design support that optimizes the amount of deformation (stress distribution) through simulation by CAE, the portion of the meat that exceeds the necessary and sufficient rigidity during the simulation process is cut off. 1. As shown in FIG. 2, the side surfaces 4 and 14 are particularly configured as a combination surface of various curved surfaces, and the shape is comparatively complicated, but it is guaranteed that each part has necessary and sufficient rigidity. However, the overall weight of the die plates 1 and 11 can be significantly reduced as compared with the conventional case. In particular, the movable die plate 1 has the same rigidity as that of a conventionally required movable die plate, while the hole 5 is formed on the side surface 4 thereof, so that the weight of the movable die plate 1 is higher than the conventional one. Can be reduced by about 30 to 40%.

  As described above, in this embodiment, since the deformation amount of each part of the die plates 1 and 11 is substantially constant in the mold clamping state, the deflection of the die plate is uniform with respect to the molded product in the mold clamping state. Therefore, it is possible to obtain a molded product having excellent density distribution accuracy and thickness accuracy. Moreover, the weight of the whole die plates 1 and 11 can be significantly reduced as compared with the conventional one while ensuring that each portion has a necessary and sufficient rigidity. In particular, the movable die plate 1 can be made 30 to 40% lighter than the conventional one while ensuring that the movable die plate 1 has the same rigidity as that of the conventional movable die plate. Therefore, high-speed response of mold opening / closing can be achieved, or downsizing of the mold opening / closing drive source can be realized.

It is a perspective view of the movable die plate of the molding machine which concerns on one Embodiment of this invention. It is a perspective view of the fixed die plate of the molding machine which concerns on one Embodiment of this invention. It is a perspective view of the conventional movable die plate. It is a perspective view of the conventional fixed die plate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Movable die plate 2 Link attachment site of movable die plate 3 Support surface of movable die plate 4 Side surface of movable die plate 5 Hole formed in side surface of movable die plate 11 Fixed die plate 12 Insertion hole of fixed die plate tie bar 13 Support surface of fixed die plate 14 Side surface of fixed die plate

Claims (2)

In a molding machine equipped with a movable die plate for attaching a movable die and a fixed die plate for attaching a fixed die.
The deformation amount of each part of the movable die plate and the fixed die plate is made substantially constant by designing with design support that optimizes the deformation amount through simulation by CAE (Computer Aided Engineering). Forming machine. The molding machine according to claim 1,
A molding machine characterized in that a side portion of the movable die plate corresponding to an intermediate position of each link attachment portion of the toggle link mechanism in the movable die plate is formed in a shape.

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