JP3082200U - Vacuum compression molding machine - Google Patents

Abstract

[PROBLEMS] To reduce the size of a vacuum compression molding machine and shorten the time required for molding work. SOLUTION: A lower heating plate (25) is fixed on a base (23) of a molding machine main body (21), and a die drawing plate (2) is placed on the lower heating plate.
7), a mold (29) is provided on the die drawing plate, and an upper protection plate (39) and an upper heating plate (41) on the upper protection plate are provided above the die drawing plate. ) Is mounted on the bolster (43), and the bolster is mounted on the ram (4) on the bolster.
5) The ram can be stopped at a desired position by closing the hydraulic circuit, and a surrounding frame (51) for raising and lowering the outside of the upper protection plate is provided. The closed space (53) to be a vacuum space is formed by the surrounding frame, the upper protection plate, and the mold drawer plate when lowered.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a vacuum compression molding machine for molding a rubber product such as an oil seal using a mold.

[0002]

[Prior art]

 Such a vacuum compression molding machine is described in Japanese Utility Model Publication No. 60-36417. As shown in FIGS. 9 and 10, a vacuum compression molding machine described in the publication (hereinafter referred to as a “conventional vacuum compression molding machine”) includes a hot platen 3 below a pressure receiving member 2 fixed to a molding frame body 1. A mold frame 6 is interposed between the hot platen 3 and a hot platen 5 on a pressing member 4 movably provided up and down, and a surrounding frame 7 for hermetically surrounding the mold frame 6 is provided. 7 is evacuated, a guide portion 2a is formed on the peripheral surface of the pressure receiving member 2, and the surrounding frame 7 is fitted on the guide portion 2a. The sealing member a is provided on the lower end surface of the enclosing frame 7, and the lower surface of the enclosing frame 7 is mounted on the outer peripheral upper surface of the lower mold mounting plate 8 provided on the lower surface of the forming frame 6. Forming a bearing portion 8a for supporting and forming the mold 6 together with the lower mold mounting plate 8 at the molding frame main body 1 and at lateral positions of the molding frame main body 1. Was over between the work table 9 is made provided movably.

[0003]

[Problems to be solved by the invention]

 However, it has been found that the conventional vacuum compression molding machine has the following problems.

(A) The height of the mold (mold frame 6) (distance between the upper surface of the upper mold and the lower surface of the lower mold) differs depending on the mold, but a mold having a small height is used. In this case, the pressing member 4 has to be largely moved in the vertical direction as compared with the case of a mold having a large height. Therefore, there is a problem that the operation takes time.

(B) The closed space is formed by the surrounding frame 7, the guide 2 a, and the lower mold mounting plate 8. That is, in the case of a mold having a small height, the downward movement stroke of the surrounding frame 7 is small, and the enclosed space formed by the surrounding frame 7, the guide portion 2a, and the lower mold mounting plate 8 is large. In other words, in the case of a mold having a small height, an unnecessarily large enclosed space is formed. When the enclosed space is large, there is a problem that the time required for evacuation becomes longer and the working efficiency is reduced, and that the rubber material is vulcanized by the heat of the mold before the mold is compressed. .

(C) In order to prevent the mold from colliding with the enclosure 7 when the mold moves between the work table 9 and the molding frame main body 1, the lower end of the enclosure 7 must be heated. It is necessary to escape above the lower surface of the board 3. Since the surrounding frame 7 moves up and down along the guide portion 2a formed on the peripheral surface of the pressure receiving member 2, the guide portion 2a and the molding frame main body are required to release the surrounding frame 7 upward in this manner. 1 must be lengthened accordingly. As a result, there arises a problem that the size of the vacuum compression molding machine increases.

The present invention has been made to solve the above-described problems in the conventional vacuum compression molding machine.

[0008]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides the following vacuum compression molding machine.

(1) A lower heating plate is fixed on a base of a molding machine main body, a mold drawing plate is provided on the lower heating plate, and a mold is provided on the mold drawing plate. An upper protection plate and an upper heating plate on the upper protection plate are mounted on the bolster above the mold drawer plate, and the bolster is moved up and down by a ram on the bolster. When the enclosure is closed, it can be stopped at a desired position. Further, an enclosure that rises and descends outside the upper protection plate is provided, and when the enclosure is lowered, the inner surface of the enclosure protects the upper protection plate. And the lower end of the enclosing frame is in close contact with the mold drawer plate so that a closed space to be a vacuum space is formed by the enclosing frame, the upper protective plate and the mold drawer plate. A vacuum compression molding machine (Claim 1).

(2) The enclosing frame is moved up and down by a cylinder attached to a bolster, and the mold drawer plate is movable between a molding machine main body and a work table arranged near the molding machine main body. Eggplant (Claim 2).

[0011]

[Action]

 [Vacuum compression molding machine of claim 1]

The ram is an upper ram type which is disposed above a mold and presses the mold from above. The ram can be stopped at a desired position according to the height of the mold by closing the hydraulic circuit. In other words, the standby position of the bolster can be set according to the height of the mold. For example, when the height of the mold is small, the standby position of the bolster can be lowered. Therefore, the ram can press the mold with a short stroke regardless of the height of the mold and even when the molds are stacked in multiple stages.

When the enclosing frame is lowered, the inner surface of the enclosing frame is in close contact with the periphery of the upper protective plate, and the lower end of the enclosing frame is in close contact with the mold drawer plate. By forming a closed space that should become a vacuum space, the volume of the closed space can be minimized by holding the bolster at a position where the upper protection plate is close to the upper surface of the mold. . In other words, the volume of the enclosed space can be minimized according to the height of the mold. By the way, when forming a closed space, the peripheral edge of the upper protective plate is not always in close contact with the upper edge of the inner surface of the enclosure, and when the height of the mold is small, the peripheral edge of the upper protective plate is compared with the inner surface of the enclosure. It is close to a very low position (see Fig. 7). The volume of the enclosed space is determined by the vertical position (height) of the upper protective plate. This is because the lid and the mold drawer cannot be moved in the vertical direction, and the horizontal cross section of the enclosure is constant.

[0014] The vacuum frame is raised and lowered by a cylinder attached to the bolster, so when the standby position of the bolster is set according to the height of the mold, the frame is also formed by the mold. You will be waiting at a position appropriate for the height. Therefore, the vertical stroke of the surrounding frame, that is, the stroke of the cylinder can be minimized in accordance with the height of the mold.

When the mold drawer plate on which the mold is disposed on the upper surface moves between the molding machine main body and the work table arranged near the molding machine main body, the mold is raised by raising the surrounding frame. The mold must be prevented from hitting the box, but the box can simply be raised to the standby position by the cylinder. Therefore, it is not necessary to increase the size of the molding machine body in order to release the surrounding frame upward.

[0016]

[Embodiment of the invention]

 Next, an embodiment of the present invention will be described with reference to the accompanying drawings. Reference numeral 21 denotes a molding machine main body. A lower hot platen 25 is fixed on a base 23 of the molding machine main body 21, and a die drawing plate 27 is arranged on the lower hot platen 25. A mold 29 is placed on the mold drawing plate 27. 29a is a lower mold and 29b is an upper mold.

The mold drawer plate 27 is movable between the molding machine main body 21 and a work table 31 arranged near the molding machine main body 21. That is, the mold drawer plate 27 is moved by the driving means 33 between the molding machine main body 21 and the work table 31 with the mold 29 placed thereon. As the driving means 33, for example, a cylinder or the like is used. In the illustrated case, the mold drawing plate 27 is supported in the molding machine main body 21 in a state of being lifted from the lower heating plate 25 by a spring-loaded roller 35 which can be moved up and down. Reference numeral 35a denotes a spring of the spring-loaded roller 35. Reference numeral 37 denotes a roller for facilitating movement of the mold drawer plate 27 provided on the work table 31. See FIG.

An upper protection plate 39 and an upper heating plate 41 on the upper protection plate 39 are disposed above the mold drawer plate 27 in a state of being attached to the bolster 43. The bolster 43 is moved up and down by a ram 45 on the bolster 43. The ram 45 can be stopped at a desired position by closing a hydraulic circuit (not shown). Reference numeral 44 denotes an upper heat insulating plate, reference numeral 46 denotes a lower heat insulating plate, and reference numeral 47 denotes a main cylinder. Reference numeral 49 denotes a bolster position detector.

Further, a surrounding frame 51 that moves up and down on the outside of the upper protective plate 39 is provided, and when the surrounding frame 51 is lowered, it is determined that the inner surface 51 a of the surrounding frame 51 is in close contact with the peripheral edge 39 a of the upper protective plate 39. When the lower end 51b of the enclosing frame 51 comes into close contact with the die drawing plate 27, a closed space (vacuum chamber) 53 to be a vacuum space is formed by the enclosing frame 51, the upper protection plate 39 and the die drawing plate 27. To be done. See FIG. When the surrounding frame 51 rises, the surrounding frame 51 is located outside the bolster 43.

In the illustrated case, the peripheral edge 39 a of the upper protection plate 39 and the lower end 51 b of the surrounding frame 51 are formed by vacuum packing. For example, an O-ring is used as the vacuum packing.

The surrounding frame 51 is raised and lowered by a cylinder 55 attached to the bolster 43 via the stay 42 as an example.

A vacuum pump 59 is connected to the closed space 53 via a connection pipe 57. That is, one end of the connection pipe 57 passes through the upper protection plate 39 and faces the closed space 53. The closed space 53 is evacuated by the vacuum pump 59.

The work table 31 may be provided with a mold disassembling device (not shown).

The expression “disposing a mold on a mold drawer plate” in the present specification, including the claims of the utility model registration, means that the upper mold 29 b of the mold 29 is fixed to the upper protection plate 39, This includes the case where only the lower mold 29a moves between the molding machine main body 21 and the work table 31 together with the mold drawer plate 27.

Next, an example of the operation sequence of the vacuum compression molding machine according to the present invention will be described as follows.

(1) First, as a preparation, the standby position of the bolster 43 is set according to the height of the mold 29. See FIG. 1, FIG. 2, and FIG.

(2) The rubber material is supplied to the mold 29 on the mold drawing plate 27 in the work table 31.

(3) The mold drawer plate 27 is moved together with the mold 29 to the molding machine main body 21. See FIG.

(4) The enclosed frame 53 is formed by lowering the surrounding frame 51. See FIG. 3 and FIG.

(5) The closed space 53 is evacuated by the vacuum pump 59.

(6) The bolster 43 is lowered to compress the mold 29. See FIG.

(7) The mold 29 is kept in a compressed state for a certain period of time.

(8) After the vacuum in the closed space 53 is released, the enclosure 51 is raised while the compressed state of the mold 29 is maintained. See FIG.

(9) After the compression of the mold 29 is released, the bolster 43 is raised again to the standby position.

(10) The mold drawer plate 27 is moved to the work table 31 together with the mold 29.

(11) The molded product is taken out of the mold 29 on the work table 31.

[0037]

[Effect of the invention]

 [Invention of Claim 1] The ram is disposed above the mold, and the ram can be stopped at a desired position in accordance with the height of the mold by closing the hydraulic circuit. In other words, the standby position of the bolster can be set according to the height of the mold. Therefore, the ram can press the mold with a short stroke regardless of the height of the mold and even when the molds are stacked in multiple stages.

When the enclosing frame is lowered, the inner surface of the enclosing frame is in close contact with the periphery of the upper protective plate, and the lower end of the enclosing frame is in close contact with the mold drawer plate. Thus, a closed space is formed, so that the volume of the closed space can be minimized by making the bolster stand by at a position where the upper protection plate is close to the upper surface of the mold. In other words, the volume of the enclosed space can be minimized according to the height of the mold. Therefore, a high degree of vacuum can be obtained in a short time by a small vacuum pump.

As a result, the time from the supply of the rubber material to the compression of the mold is greatly reduced, and the time required for the vulcanization of the rubber material to proceed by the heat of the mold before the compression of the mold is reduced. Since it is compressed, a good molded product can be obtained. Further, the guide portion 2a in the conventional vacuum compression molding machine becomes unnecessary. Therefore, also in this respect, the molding machine body can be made compact, and a vacuum compression molding machine can be provided at low cost.

Since the ram is provided above the mold, the working height can be reduced. Therefore, the burden on the operator when supplying the rubber material to the mold, disassembling the mold, and the like is reduced, and the work efficiency is improved.

[Invention of Claim 2] Since the surrounding frame is moved up and down by the cylinder attached to the bolster, when the standby position of the bolster is set according to the height of the mold, the surrounding frame is also at the height of the mold. You will be waiting at the right place. Therefore, the lifting stroke of the surrounding frame, that is, the stroke of the cylinder, is naturally adjusted to the minimum necessary in accordance with the height of the mold.

When the mold drawer plate on which the mold is disposed on the upper surface moves between the molding machine main body and the work table disposed near the molding machine main body, the metal frame is raised by raising the surrounding frame. The mold must be prevented from hitting the box, but the box can simply be raised to the standby position by the cylinder. Therefore, it is not necessary to increase the size of the molding machine body in order to release the surrounding frame upward.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of a vacuum compression molding machine according to the present invention.

FIG. 2 is a front view showing a state where the mold is moved to a molding machine main body in the vacuum compression molding machine.

FIG. 3 is a front view showing a state where the enclosed frame is lowered to form a closed space in the vacuum compression molding machine.

FIG. 4 is a front view showing a state in which a mold is compressed in the vacuum compression molding machine.

FIG. 5 is a front view showing a state where the surrounding frame is raised while the mold is compressed in the vacuum compression molding machine.

FIG. 6 is a front view showing a state in which a small height mold is moved to a molding machine main body in the vacuum compression molding machine.

FIG. 7 is a front view showing a state in which a closed space is formed by lowering a surrounding frame in FIG. 6;

FIG. 8 is an explanatory diagram showing a closed space.

FIG. 9 is a front view showing a conventional vacuum compression molding machine.

FIG. 10 is a side view showing a conventional vacuum compression molding machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Forming frame main body 2 Pressure receiving member 2a Guide part 3 Heating plate 4 Pressing member 5 Heating plate 6 Formwork 7 Enclosure frame 8 Lower formwork mounting plate 8a Supporting part 9 Work table 21 Forming machine main body 23 Base 25 Lower heating plate 27 Mold drawer plate 29 Die 29a Lower mold 29b Upper mold 31 Work table 33 Drive unit 35 Roller with spring 35a Spring 37 Roller 39 Upper protection plate 39a Peripheral edge 41 Upper heating plate 42 Stay 43 Bolster 44 Upper insulation plate 45 Ram 46 Lower insulation plate 47 Main cylinder 49 Bolster position detector 51 Surrounding frame 51a Inner surface 51b Lower end 53 Sealed space 55 Cylinder 57 Connection pipe 59 Vacuum pump

Claims (2)

[Utility model registration claims] 1. A lower heating plate is fixed on a base of a molding machine main body,
A mold drawing plate is provided on the lower heating plate, a mold is provided on the mold drawing plate, and an upper protection plate and an upper heating plate on the upper protection plate are provided above the drawing plate. Is mounted on a bolster, and the bolster is moved up and down by a ram on the bolster so that the ram can be stopped at a desired position by closing a hydraulic circuit. When the surrounding frame is lowered, the inner surface of the surrounding frame is in close contact with the periphery of the upper protection plate, and the lower end of the surrounding frame is in close contact with the mold drawer plate. A vacuum compression molding machine characterized in that a closed space to be a vacuum space is formed by the frame, the upper protection plate and the mold drawing plate. 2. The frame is raised and lowered by a cylinder mounted on a bolster, and the mold drawer plate is movable between a molding machine main body and a worktable disposed near the molding machine main body. The vacuum compression molding machine according to claim 1, wherein: