JP4193014B2 - Mold release device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a molded product release apparatus that is used, for example, to release a molded product after injection molding from a mold.
[0002]
[Prior art]
For example, when a molded product having a desired shape is formed by injection molding a material such as a rubber material, it is necessary to release the molded product from the mold after the injection molding is completed, particularly as shown in FIG. In the molded product 51 having a complicated shape, since the molded product 51 is firmly attached to the molding die 52 when the molding die is opened, the mold release is not easy.
[0003]
In this regard, in the past, the worker pulled the molded product from the mold by pulling one end of the molded product, but only the problem of increasing the product cost and various equipment costs to improve the work environment. In other words, if the peeling operation is not performed carefully, there is a problem that the surface of the molded product is damaged and the molded product is damaged.
[0004]
Therefore, as an apparatus for automating such a mold release operation, for example, one disclosed in Japanese Utility Model Laid-Open No. 6-724 has been proposed, and the mold release apparatus described in this publication uses a fluid such as air. This is used to release the molded product from the mold.
[0005]
However, the method of blowing fluid such as air between the molded product and the mold as described above is excellent in the mold release success rate, but requires a large amount of fluid and is molded by a molding material with particularly high adhesiveness. This problem is conspicuous when the above is performed. Moreover, according to the air blow, since the molded products are scattered after being released, it is necessary to have a device for collecting them in one place, and there is a problem in adopting an air blow type release device in a mass production line. .
[0006]
Further, as shown in FIG. 5, the applicant of the present application previously provided a chuck 53 that is provided so as to be openable and closable with respect to the molded product 51 attached to the mold 52, and reduces the diameter of one end 51 a of the molded product 51. 53, a mold release device having a pin 54 that passes through the outside of one end 51a of the molded product 51 reduced in diameter by 53 and pushes up the outer surface 51b of the molded product 51 is proposed. The molded product 51 can be released from the mold 52 without the need for fluid.
[0007]
However, as in the molded product 51 shown in FIG. 6, there is a large difference A between the outer diameter of the tip 51c of the small diameter portion constricted on the inside and the outer diameter of the one end 51a, or the wall thickness B of the one end 51a is large. In other words, since the mold release resistance is large, it is considered that the film part 51d of the molded product 51 is damaged at the time of mold release even in the mold release apparatus of FIG.
[0008]
[Problems to be solved by the invention]
In view of the above points, the present invention is an improvement on the mold release device shown in FIG. 5, and includes an outer diameter dimension at the tip of a small diameter portion constricted inward and an outer diameter dimension at one end in a molded product. Providing a mold release device that can release a molded product smoothly from the mold even when the difference is large or when the mold release resistance is large, such as when the thickness of one end of the molded product is large The purpose is to do.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a molded product release apparatus of the present invention is provided so as to be openable and closable with respect to a molded product attached to a molding die, and a chuck for reducing the diameter of one end of the molded product; It has a plate-shaped pressing member which presses the plane center part of the end of the diameter-shaped said molded article, It is characterized by the above-mentioned.
[0010]
In the mold release device of the present invention having the above-described configuration, one end of the molded product is reduced in diameter by a chuck, and the flat central portion of one end of the reduced diameter molded product is pressed by a plate-like pressing member. In addition to reducing the diameter of one end of the product, mold release is performed with one end of the molded product folded inside. Therefore, the resistance force when pulling out the tip of the small diameter portion constricted on the inside is much smaller than in the case of the above prior art.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0012]
FIG. 1 (A) is an explanatory diagram of a main part configuration of the release device 1 according to the embodiment as viewed from the front, and the release device 1 is shown in FIG. 1 (B) from the state shown in FIG. ), And further to the states of FIGS. 2C and 2C '. FIG. 3 is an explanatory plan view of the arrangement of the chucks 2, 2 and the pressing member 3 provided in the mold release device 1.
[0013]
The mold release apparatus 1 according to this embodiment is used for releasing the molded product 51 shown in FIG. 6 from the mold 52, and the molded product 51 of FIG. It is drawn in 1.
[0014]
Specifically, this molded product 51 is a rubber seal member used for a brake booster for automobiles, and is molded as a cylindrical body or an annular body having both ends opened in the axial direction. Is attached to the inner surface of the mold 52. Further, the molded product 51 is provided with an annular small-diameter tip 51c constricted on the inside, and the outer diameter of the small-diameter tip 51c and the outer diameter of one end (one axial end) 51a of the molded product 51. The difference A (see FIG. 6) is set to be relatively large, and the thickness B (see FIG. 6) of the one end 51a of the molded product 51 is set to be relatively large. Therefore, this molded product 51 has a relatively large mold release resistance. The molded product 51 is formed by integrally molding a large-diameter portion 51e provided at one end 51a and a small-diameter portion 51g provided at the other end (the other end in the axial direction) 51f via a film portion 51d. is there.
[0015]
The mold release device 1 has the chucks 2 and 2 and the pressing member 3 as described above, and further, a molding die in a state where a driving source (not shown) for operating these components and a molded product 51 are attached. And a support portion (not shown) for supporting 52.
[0016]
First, it is disposed below the molding die 52 supported by the support portion so as to be openable and closable with respect to the molding 51 adhering to the molding die 52, and when closed, the one end 51a of the molding 51 is gripped from the outside to be contracted. Chuckes 2 and 2 are provided for making the diameters.
[0017]
The chucks 2 and 2 are provided so that the two claws open and close (approach and move away from each other), and as shown in FIG. A circular notch 2a is provided. The chucks 2 and 2 are opened and closed by a fluid pressure cylinder, for example, but only one chuck 2 is reciprocated, and the other chuck 2 is connected to one chuck 2 by a driven mechanism such as a rack and pinion mechanism. You may make it reciprocate.
[0018]
Below the pair of chucks 2 and 2, a pressing member 3 (also referred to as a protruding member or a protruding member) 3 having a plate shape is provided so as to be movable up and down.
[0019]
The plate-like pressing member 3 is arranged so that the plane of the plate material is parallel to the direction in which the pair of chucks 2 and 2 are arranged, and the length L in the left-right direction at the upper end portion thereof is set as a molding die 52. 2 is set to be slightly smaller than the inner diameter dimension of the minimum inner diameter portion of the molded product molding portion, and in the process of rising from the lower end of the vertical movement, one end 52a of the molded product 51 with its upper end surface as shown in FIG. Abutting in the diametrical direction against the end face on the side, and further pressing the center part of the end face upward.
[0020]
Next, the operation of the mold release apparatus 1 having the above configuration will be described.
[0021]
First, when the injection molding is completed, the molding die 52 is opened, and as shown in FIG. 1A, the molding die 52 to which the molded product 51 is attached is fixed to the support portion of the mold release device 1. At this time, the chucks 2 and 2 are located at the open position, and the plate-like pressing member 3 is located at the lower end limit of the vertical movement.
[0022]
Next, as shown in FIG. 1B, the chucks 2 and 2 are closed and the one end 51a of the molded product 51 is gripped to reduce the diameter. Thereby, first, the part below the small diameter part front-end | tip 51c of the molded article 51 is peeled from the shaping | molding die 52. FIG.
[0023]
Next, as shown in FIGS. 2 (C) and 2 (C ′), the plate-like pressing member 3 is raised while the one end 51a of the molded product 51 is reduced in diameter by the chucks 2 and 2, and the upper end surface thereof is moved. This is brought into contact with the center of one end surface of the molded product 51 and further pushed up. As a result, the molded product 51 is pushed up by the pressing member 3 in a state where the portion below the small-diameter portion tip 51c of the molded product 51 is folded as shown in FIG. The part above the tip 51c is also peeled off from the mold 52. Therefore, by the above operation, the entire molded product 51 is protruded above the mold 52, and a series of mold release steps is completed.
[0024]
According to the mold release apparatus 1 provided with the said structure, there can exist the following effects.
[0025]
That is, first of all, since it is not a peeling method by air blow as in the above prior art, but a peeling method by a mechanical structure using the chucks 2, 2 and the plate-like pressing member 3, a large amount of fluid is required. It is suitable for use in mass production processes. Further, since an excessive force does not act on the molded product 51 when releasing the mold, there is no possibility of damaging the molded product 51. In addition, by automating the mold release work in this way, it is possible to reduce the cost by manpower, and also to reduce the work cost required for the worker and the equipment cost related to the safety equipment. .
[0026]
In addition to this, since the extruding structure using the plate-like pressing member 3 is used instead of the extruding by the pin as in the prior art, the one end 51a of the molded product 51 is merely reduced in diameter by the chucks 2 and 2. 2 (C ′), the mold 51 is released in a state in which one end 51a of the molded product 51 is folded inward by the plate-like pressing member 3, so that the tip 51c of the small-diameter portion constricted inside is formed. The resistance when pulling out is small. Therefore, as shown in the illustrated molded product 51, when the difference between the outer diameter of the small diameter portion tip 51c constricted inside the molded product 51 and the outer diameter of the one end 51a of the molded product 51 is large, Even when the thickness of the one end 51 a is large, the molded product 51 can be smoothly released from the mold 52.
[0027]
When a large number of molded products 51 are to be obtained, a plurality of the chucks 2 and 2 and the plate-like pressing member 3 may be provided according to the number of the multi-cavity products.
[0028]
【The invention's effect】
The present invention has the following effects.
[0029]
That is, according to the molded product release apparatus of the present invention having the above-described configuration, one end of the molded product is reduced in diameter by the chuck, and the central portion of the one end surface of the reduced diameter product is provided by the plate-like pressing member. Since the pressing is performed, not only one end of the molded product is reduced in diameter by the chuck, but also the mold is released while the one end of the molded product is folded inward by the plate-shaped pressing member. The resistance when pulling out the tip of the constricted small-diameter portion is much smaller than in the prior art. Therefore, for example, when the difference between the outer diameter of the tip of the small diameter portion constricted inside the molded product and the outer diameter of one end of the molded product is large, or when the thickness of one end of the molded product is large, the mold release resistance is large. Even in this case, the molded product can be smoothly released from the mold, and the molded product can be prevented from being damaged during the mold release.
[Brief description of the drawings]
FIG. 1A is an explanatory diagram of a main part configuration of a release device according to an embodiment of the present invention when viewed from the front, FIG. 1B is an operation explanatory diagram of the device, and FIG. (C ') is a view taken in the direction of the arrow C in Fig. (C). Fig. 3 is an explanatory diagram of a planar arrangement of chucks and pressing members which are components of the apparatus. Fig. 4 is a molded product and a molding die. FIG. 5A is an explanatory view of a main part of a conventional mold release device viewed from the front, and FIGS. 5B and 5C are operation explanatory views of the device. 6 is a cross-sectional view showing an example of a molded product and a molding die to be worked by the mold release apparatus according to the embodiment of the present invention.
DESCRIPTION OF SYMBOLS 1 Mold release apparatus 2 Chuck 2a Notch part 3 Pressing member 51 Molded product 51a One end 51b Outer surface 51c Small diameter part front end 51d Film part 51e Large diameter part 51f Other end 51g Small diameter part 52 Mold

Claims (1)

A chuck (2) provided so as to be openable and closable with respect to the molded product (51) attached to the molding die (52), and reducing one end (51a) of the molded product (51);
A plate-like pressing member (3) that presses the planar central portion of one end (51a) of the molded product (51) reduced in diameter by the chuck (2) in the axial direction. Release device.

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