JPH06210679A - Resin molding machine - Google Patents

Abstract

PURPOSE:To reduce a space formed on the upper side or the lower side between mating surfaces and mold a large molded product with high accuracy by heat deforming a mold. CONSTITUTION:In a resin molding machine provided with a first mold 1 and a second mold 2 and molding a molded product by injecting a resin material into a cavity formed by mating two molds 1 and 2, a plurality of pressing means 24 for pressing the second mold 2 are provided on the rear face side of the above-said second mold 2. The pressing means 24 can press a plurality of sites separated in the upper and lower direction individually and simultaneously. The second mold 2 is placed on a support component 31 supporting the second mold 2 moving inclinedly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin molding machine suitable for molding large molded articles and the like.

[0002]

2. Description of the Related Art Conventionally, for example, in a thermosetting resin molding machine, the mating surfaces of a set of halves are combined and integrated, and a cavity is formed inside the resin. The material is injected and cured, and then the mold is opened to take out the molded product.

[0003]

However, in the above resin molding machine, the mold may be thermally deformed by heating or the like at the time of curing and the mating surface may be inclined. Therefore, when the molds are matched, a gap is formed above or below each mating surface. This gap does not greatly affect the molding accuracy when the mold is small, but in the case of a large mold that molds a large molded product, the wall thickness of the molded product is significantly increased or decreased. In some cases, precision problems may occur in the molded product.

The present invention has been made to solve the above-mentioned conventional drawbacks, and its purpose is to reduce the influence of thermal deformation of a mold and to mold a large molded product with high accuracy. To provide.

[0005]

Therefore, the resin molding machine according to the present invention has a first mold 1 and a second mold 2, and a cavity 41 is formed inside by molding these two molds 1 and 2. In the resin molding machine in which the cavity 41 is formed and a resin material is injected into the cavity 41 to obtain a molded article, a plurality of pressing means 24 for pressing vertically separated positions on the back side of the second mold 2 are provided, Two
The mold 2 is a support member 3 that supports the second mold 2 so as to be tiltable.
It is characterized in that it is placed on 1.

[0006]

In the mold matching operation of the resin molding machine, as shown in FIG. 5, when there is a gap on the lower side, for example, the pressing means 24 provided on the back side of the second mold 2 are moved vertically. When a plurality of distant locations are independently pressed, the second mold 2 tilts on the support member 31 as shown by the broken line in the figure, and the mating surface of the second mold 2 is aligned with that of the first mold 1. Move along the mating surface. For this reason, the above-mentioned gap generated on the lower side of the mating surfaces of the first mold and the second mold is reduced. Even if there is a gap on the upper side, it can be reduced in the same manner as above.

[0007]

EXAMPLES Next, specific examples of the resin molding machine of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view for explaining the schematic configuration of an embodiment of a resin molding machine of the present invention, which is a thermosetting resin (dicyclopentadiene).
2 shows a state in which a pair of dies of the RIM molding machine of FIG. 2 shows a state in which both molds are close to each other, FIG. 3 shows a state in which both molds are closed, and FIG. 4 shows a state in which both molds are clamped by a clamping means.

In FIG. 1, 1 and 2 are a set of molds, 1 is a core mold (first mold), and 2 is a cavity mold (second mold). First, the core type 1 will be described.
The lower end of the mold is supported by two mold supporting members 3 and is fixed to a surface plate 4 which is integrated with the frame 42 by four mold mounting clamps 6 which are vertically and horizontally arranged.
Reference numeral 8 denotes a mating surface on the side of the core mold 1 which is maintained vertically, and four mating surfaces 10 are provided on the mating surface 8 at substantially the center of the upper, lower, left and right sides of the peripheral portion.

Next, like the core mold 1, the mold mold 2 is mounted on the surface plate 5 by means of four mold mounting clamps 7 on the upper and lower sides and on the right and left sides, and together with this surface plate 5, a traveling carriage (moving means) 16
Is mounted via a free bearing (support member) 31 described later. 9 is a mating surface of the mold type 2,
Initially, the mold is manufactured so as to be completely in contact with the mating surface 8 of the core mold 1. The mating surface 9 is loosely fitted to the projection 10 when the molds are matched.
Individual fitting grooves 11 are engraved, and locking parts 12 that cooperate with a mold clamping clamper 27 described later are provided on both right and left sides of the surface plate 5.
Recesses 13 are provided on the back surface thereof. The lower surface of the mold 2 that contacts the free bearing 31 is subjected to wear resistance treatment.

Reference numeral 16 is a traveling carriage. This traveling carriage 16
Has an endless chain 19 attached to the traveling carriage 16, two rails (not shown) fixed to the frame 42, and a drive motor 18 for rotating the endless chain 19. By driving and rotating the endless chain 19 forward and backward,
The traveling carriage 16 is capable of reciprocating in the core mold 1 direction.

The free bearing 31 is used for the traveling carriage 1.
A plurality of cylinders that are connected in parallel in the left-right direction in a plurality of rows in the base on 6 and are housed in the individual cylinders;
The piston includes a piston that is pressed upward by compressed air supplied into the cylinder and that is vertically slidable, and a ball that is rotatably provided on the upper end of the piston. That is, the free bearing 31 has a structure that allows the mounted object to be slid, and that the free bearing 31 flexibly moves in the vertical direction in accordance with the applied load.

Reference numeral 21 is a positioning means, and 24 and 24 are two pressing means. Both of them have a piston that can expand and contract in the direction of the core mold 1 by hydraulic pressure, and are arranged and fixed on the back side of the cab mold 2 which is the rear part of the traveling carriage 16. The mounting position of the positioning means 21 is a position where the tip of the piston comes into contact with the recess 13 of the surface plate 5 when the piston extends. More specifically, it is a position on the back surface of the surface plate 5 that is centered in the horizontal direction and slightly offset from the center in the vertical direction. As shown in FIG. 2, the positioning means 21 extends the piston and slides the mold 2 in the direction of the core mold 1 on the free bearing 31 via the surface plate 5 to move the mating surfaces 8 together. , 9 are moved until they come close to each other, and the projection 10 is loosely fitted in the fitting groove 11.
Even in such a loosely fitted state, the mating surface is inclined in the vertical direction due to the thermal deformation of the mold, so that a gap may be formed on the upper side or the lower side between the two mating surfaces.

On the other hand, the mounting positions of the two pressing means 24 are
It is a position corresponding to the lower right side and the upper left side with respect to the back surface of the surface plate 5. Further, at the tip of the piston of the pressing means 24, even if the back surface of the surface plate 5 is inclined vertically, the pressing plate 25 can press the back surface of the surface plate 5 along the inclination.
Are attached so as to be tiltable and eccentric. Then, as shown in FIG. 3, the pressing means 24 pushes the mold 2 through the surface plate 5 after the loose fitting, and from the rear side thereof,
The points are pressed independently at the same time.

27 is a mold clamping clamper. As shown in FIG. 4, the mold clamping clamps 27 are arranged on the left and right sides of the core mold 1 in a pair of upper and lower sides, and the base end of the arm 28 is fixed to the surface plate 4 and the tip end thereof is fixed. A hook claw 29 movable by a cylinder is attached. After the pressing operation of the pressing means 24, the locking claws 29 are engaged with the locking portions 12 provided on the surface plate 5 on the side of the mold 2 so that the mold clamping clampers 27 on both the left and right sides can be pressed against both molds. Support to hold one or two.

In the apparatus having the above structure, when the molds 1 and 2 are closed and the molds are matched with each other in order to carry out the molding, the procedure is as follows. First, the drive motor 18 is driven from the state shown in FIG. 1 to rotate the endless chain 19 in the forward direction, and the traveling carriage 16 is caused to travel in the direction of the core mold 1 to bring the mold mold 2 closer to the core mold 1. Next, as shown in FIG. 2, the piston of the positioning means 21 is extended, the tip of this piston is brought into contact with the recess 13 formed on the back surface of the surface plate 5, and the cavity mold 2 is inserted through the surface plate 5.
Press. When pressed, the mold die 2 slides on the free bearing 31, the mating surface 9 thereof approaches the mating face 8 of the core mold 1, and then the protrusion 10 of the core mold 1 and the fitting groove 11 of the mold mold 2 are loosely fitted. Ready to go. The pressing operation is performed only when the mold 2 is carried in and set, and is omitted during a steady molding operation.

After the loose fitting, as shown in FIG. 3, the piston of the pressing means 24 is extended, and the pressing plate 25 attached to the tip of the piston is brought into contact with the back surface of the surface plate 5,
Through the surface plate 5, the right side lower portion and the left side upper portion of the mold 2 are independently and simultaneously pressed. As shown in FIG. 5, the pressing operation causes the mating surfaces to tilt, and the gap generated under the mating surfaces due to the thermal deformation of the mold is reduced. At this time, the back surface of the surface plate 5 and the lower surface of the surface plate 5 and the cavity mold 2 are tilted together with the decrease of the above clearance due to the action of the pressing force, and the free bearing 31 absorbs the tilting of the lower surface. It will be.

Next, after the gap between the mating surfaces 8 and 9 is reduced, as shown in FIG. 4, the latching claw 29 of the mold clamping clamper 27 is provided on the platen 5 and the latching part 12 is provided. Hang on to. Due to this engagement, the mold clamping clamper 27 is fixed to both molds 1, 2.
It becomes possible to support the pressure due to the volume expansion of the raw material during molding. In such a holding state, the mold support member 3, the mold mounting clampers 6 and 7, the positioning means 21,
It is assumed that all the pressing means 24 are in a free state. Cavity 4 formed by the above mold matching operation
The raw material is injected from the lower side of the core mold 1 into the core mold 1 to start molding. After that, when both molds 1 and 2 are opened and the molded product is taken out, the reverse process of the above operation is carried out.

As described above, in the resin molding machine in the above-described embodiment, the pressing means 24 presses the rear surface of the cabinet mold 2 at the lower right side and the upper left side at the same time independently and simultaneously through the surface plate 5. Then, the mating surface 9 that is inclined due to thermal deformation of the mold 2 is displaced toward the mating surface 8 side, and the tilting of the lower surface of the mold 2 that occurs due to this is absorbed by the free bearing 31. Therefore, the gap between the mating surfaces 8 and 9 can be reduced. For this reason, the size and shape of the cavity 41 can be maintained with high accuracy, which enables high-precision molding of a large molded product.

The specific embodiments of the resin molding machine of the present invention have been described above, but the present invention is not limited to the above embodiments, and various modifications may be made within the scope of the present invention. It is possible. For example, in the above-described embodiment, the mold 2 is pressed by the positioning means 21 or the pressing means 24 via the surface plate 5, but the surface plate 5 may be omitted and it may be directly pressed. Also, the positioning means 21,
The mounting position and the number of the pressing means 24 are not limited to the above. Further, the mold clamping clamper 27 can be made to function as a pressing means.

[0020]

As described above, in the resin molding machine of the present invention, it is possible to reduce the gap generated on the upper side or the lower side of the mating surfaces of the first mold and the second mold during the mold matching by a simple operation. Therefore, it is possible to mold a large molded product with high accuracy.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a resin molding machine according to the present invention and showing a state in which a set of molds is open, with a partial cross section.

FIG. 2 is a side view showing a state in which the molds of the above-mentioned embodiment are close to each other with a partial cross section.

FIG. 3 is a side view showing a partially cross-sectional view of the mold of the above embodiment, which is pressed and closed by a pressing means.

FIG. 4 is a plan view showing a part of a state where the mold of the above embodiment is clamped by a mold clamping clamper.

FIG. 5 is an explanatory diagram illustrating a reduction in a gap between both mating surfaces of the mold of the above-described embodiment.

[Explanation of symbols]

 1 1st type 2 2nd type 24 Pressing means 31 Support member 41 Cavity

Claims (1)

[Claims] 1. A first mold (1) and a second mold (2) are formed, and a cavity (41) is formed inside by combining these two molds (1) and (2), In a resin molding machine for injecting a resin material into this cavity (41) to obtain a molded article,
A plurality of pressing means (24) for pressing vertically separated positions on the back side of the die (2) are provided, and the second die (2) supports the second die (2) so as to be tiltable. Material (31)
A resin molding machine characterized by being placed on top.