JPH06307549A - Rubbery molded product with support frame - Google Patents

Abstract

PURPOSE:To possess stability of a rubbery molded product in an unstable shape utilized for a gasket. CONSTITUTION:A rubbery molded product 10 with a support frame comprises a support frame 11 formed in a given shape; coupling ribs 12 separably engaged with the support frame 11 in the inner region of the support frame 11; and a rubbery molded product 13 separably formed integrally with the region of the coupling rib 12. The rubbery molded product 10 with a support frame is formed such that the support frame 11, the coupling ribs 12, and the rubbery molded product 13 are integrally formed through press molding or injection molding. In the integrally formed rubbery molded product 10 with a support frame, only the rubbery molded product 13 is cut away from the support frame 11 and the coupling ribs 12 and mounted in a groove formed in the given spot of a member to be mounted, such as an engine mount.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber-like molded product with a supporting frame, and more particularly to a rubber-like molded product that can be used as a sealing material or cushioning material for various machine parts.

[0002]

2. Description of the Related Art Conventionally, in order to impart a predetermined sealing effect or cushioning effect between parts of various machines, a sealing material such as a gasket made of a rubber-like molded product having a ring shape is interposed. The method of letting is adopted. As a method of attaching or adhering this rubber-like molded product to a mounted member such as a coupling member constituting a split-type machine part to make an integrally molded product, generally, a rubber-like molded product is previously injection-molded or A method of forming by press molding (compression molding), etc., and then inserting this into a groove or the like formed in a predetermined position of the mounted member by handling by pressing or using a predetermined adhesive is adopted. ing.

Further, when the shape of the rubber-like molded article is relatively simple, or the shape fit between the rubber-like molded article and the mounted member on which the rubber-like molded article is mounted is well suited. Under limited conditions such as the case where the rubber-like molded article is automatically mounted on the mounted member through an automatic machine equipped with an appropriate pushing jig and the like.

Further, a method of forming an integrally molded product by the insert molding method is also partially used. That is, it is a method in which the mounted member is previously arranged in a molding die and a molding material is injected in this state to form an integrally molded product.
In addition to this, after double-injection molding is used to mold the plastic member into a prescribed shape by primary molding, part of the molding die is replaced, or a secondary cavity is provided by the core back method, etc. A method of manufacturing an integrally molded product by molding the molded product has also been reported.

In general, when molding a rubber-like molded product, it is inevitable that a thin burr is formed around the rubber-like molded product along the parting surface of the mold. Burr removal work is required to commercialize itself,
This work is difficult to automate because the shape of the rubber-like molded product itself and the shape of the burr are unstable, and therefore the reality is that deburring is performed by handling.

[0006]

However, the method of mounting the rubber-like molded product on the mounted member by handling as described above is fundamentally manual, so that the mass productivity is poor and the cost is increased. In addition, there is a problem in that variations in product quality such as mounting mistakes are likely to occur, and the skill level of the operator is required.

Further, the automatic mounting of the rubber-like molded product, which is performed only in a small part, is performed when the shape of the rubber-like molded product is simple as described above, and when the rubber-like molded product and the member to be mounted are mounted. However, there is a problem in that the geometrical arrangement is limited to the case where it is extremely simple. Furthermore, under the condition that the manufacturing site of the rubber-like molded product and the site of mounting the rubber-like molded product on the mounted member are different, the rubber-like molded product is packed and transported to the site of mounting. In this case, deformation such as twisting occurs due to vibration and load applied to the rubber-like molded product, and due to this, the rubber-like molded product is accurately applied to the automatic machine for automatic mounting. There was a problem of not having.

Further, the method of manufacturing an integrally molded product of a rubber-like molded product and the mounted member by an insert molding method or a double injection molding method is a method of inserting a mounted member to be inserted (a primary molded product in the double injection molding method). The shape of) must have good shape accuracy in order to be integrated, and in addition to securing a large area for arranging the rubber-like molded product, the structure for integration must also be considered. There are restrictions on the design, etc., so that it is almost impossible to carry out with the shape of the product with the conventional rubber-like molded product mounted as it is, and a special design is required when the molding method is adopted. There was also a problem.

By the way, in order to improve the instability of the shape of the rubber-like molded product alone, for example, as shown in FIG. 7, the shape supporting member 51 and the gasket 52 which is the rubber-like molded product are integrated. The so-called carrier gasket 50 has been put into practical use. This is one in which the shape support material 51 is inserted into a molding die and the gasket 52 is formed by insert molding through through holes 53 formed at a plurality of positions in the front and back direction thereof. However, in this case, it is inevitable that the shape support material 51 is used as a part of the components of the product, not only the cost is inevitably increased, but also the O-ring structure is difficult to be taken and the pressure resistance and the like are deteriorated. The mounted member on which the carrier gasket 50 is mounted must have a shape that matches it, and the restrictions on the product design still remain.

The deburring work of a rubber-like molded product causes a cost increase due to a decrease in mass productivity. Therefore, a part of a mold parting line surface is finished with high accuracy to avoid burrs. Molds are also manufactured, but there is a problem that not only requires extremely high skill but also lacks versatility, which leads to further cost increase.

[0011]

SUMMARY OF THE INVENTION The present invention has been made by paying attention to such various problems of the prior art, and an object of the present invention is to always maintain the regularity of a rubber-like molded product whose shape is unstable. In addition, the supporting frame and the rubber-like molded article used to secure the regularity can be easily integrally molded, and only the rubber-like molded article can retain the regularity. (EN) Provided is a rubber-like molded product with a support frame that can be mounted on a predetermined member to be mounted while separating it.

[0012]

In order to achieve the above-mentioned object, a rubber-like molded article with a support frame according to the present invention is arranged in a support frame defined in a predetermined shape and an inner region of the support frame. And a connection rib that is separably integrated with the support frame, and is held via the connection rib,
A rubber-like molded product integrally molded so that it can be separated from the connecting rib by a predetermined pushing force is adopted.

[0013]

According to the present invention, since the rubber-like molded product is integrated with the support frame through the connecting ribs, the rubber-like molded product is ready to be mounted on the mounted member. The shape that should have originally is stably retained. This rubber-like molded product with a support frame is first subjected to a step of molding the support frame, and then the support frame and the connecting rib are formed while molding the connecting rib and the rubber-like molded product by press molding (compression molding) or injection molding. It can be formed by a method of engaging and. Then, the rubber molded article is mounted on the mounted member by a predetermined pushing force in a state where the support frame is arranged at a position facing the mounted member.

The rubber-like molded article according to the present invention is used for various machine parts such as gaskets and packings, thin plate-shaped contact rubbers used for computers and mobile phones, or for electronic parts. Further, as a molding method of the rubber-like molded product with a support frame, generally widely used press molding method and injection molding method can be used.

In the press molding method, a vulcanizing agent and other additives are kneaded into an unvulcanized rubber material with a kneader or two rolls, and the mixture is taken out in accordance with the shape of the product, and the resulting mixture is placed in a mold. It is placed in a heat press machine and is heated and compressed at a temperature of about 120 to 180 ° C. for several minutes to cure the material and obtain a molded article. At this time, in order to make a rubber-like molded product with a support frame, it is possible to place a support frame made of a material having heat resistance equal to or higher than the temperature of hot pressing in a mold in advance.

As the material of the connecting ribs and the rubber-like molded article, generally, any material can be used as long as it is used for press molding, but in the present invention, acrylic rubber, NBR, Examples include SBR, natural rubber, urethane rubber, silicone rubber, fluororubber, EPDM, etc., which can be arbitrarily selected according to the purpose of use.
As a method of curing these rubbers, a method of causing a crosslinking reaction by heating and curing, such as a method of sulfur vulcanization or a method of peroxide vulcanization, is used. It is also possible to form an integrated product by adhesion by applying an adhesive as a primer to the support frame of the connecting rib, if necessary.

In the injection molding of the present invention, thermoplastic elastomers and thermosetting elastomers are roughly classified from the material side, and the molding methods are insert molding and
It is roughly divided into the double injection method. Here, as the thermoplastic elastomer, vinyl chloride-based, olefin-based,
Urethane-based, polyester-based, fluorine-based, etc. can be used. These features include the fact that molding can be carried out at an extremely high speed, as in the case of a normal plastic molding cycle, and that a mold having a low temperature can be used even if it has a low heat resistant temperature.

Thermosetting elastomers are classified into millable type and liquid type. The millable type is basically the same as the above-mentioned press molding in terms of material, in which unvulcanized rubber kneaded and taped out is put into an injection cylinder and molded by the injection method. Similarly to press molding, various materials can be used at low cost. The liquid type can generally use a silicone resin and a urethane resin. Among them, the silicone resin has a large merit that the characteristics of the molded product are excellent because the molding cycle is particularly fast.

The insert molding method in the injection molding method is
Similar to press molding, this is a method in which a support frame is previously placed in a mold and then the above-mentioned materials are injection-molded to make an integrated molded product. On the other hand, in the double injection method, a plastic support frame is molded by primary molding and then either the fixed side or the moving side mold is replaced by sliding or rotating, and a secondary molding product, such as a connecting rib and a rubber-like molded product. It is a method of molding a rubber-like molded product with a supporting frame by providing a cavity for the molding. At this time, for the secondary cavity, a core back method in which a part of the mold is moved can be adopted. The injection molding method requires an absolute condition that the heat-resistant temperature of the support frame, which is the primary molded product, is not higher than the curing temperature or mold temperature of the connecting ribs and rubber-shaped molded product that are the secondary molded products. The combination of and the secondary molding material may be limited. In this respect, when a thermoplastic elastomer is used as the secondary molding material, since the mold temperature at the time of the secondary molding is low, there is an advantage that it has considerable versatility.

In the above-mentioned molding method, when the connecting rib and the rubber-like molded article are liquid silicone rubbers for injection molding, molding with a molding cycle of 60 seconds or less and an injection pressure of 150 Kgf / cm ² or less is exemplified. For liquid urethane rubber for molding, molding cycle 300 seconds or less, injection pressure 70 kg
Examples of molding are f / cm ² or less.

The molding material for the supporting frame in the present invention may be any material having appropriate rigidity and capable of imparting a shape-retaining function, and specifically, iron, aluminum, stainless steel, magnesium. It can be molded with a metal material such as an alloy, wood, or various thermoplastic or thermosetting synthetic resin materials.

[0022]

Embodiments of the present invention will now be described in detail with reference to the drawings. Here, FIG. 1 is an external perspective view of a rubber-like molded product with a support frame according to the first embodiment, and FIG. 2 is an enlarged sectional view taken along the line AA of FIG.

In FIGS. 1 and 2, the rubber-molded product 10 with a support frame according to this embodiment is formed such that the plane shape thereof is a substantially rectangular shape as a whole. This rubber-like molded product 10 with a support frame is a support frame 1 having a rectangular ring shape.
1, a rubber-like molded product 13 arranged in the inner region of the support frame 11, the support frame 11 and the rubber-like molded product 13
And a plurality of connecting ribs 12 for connecting the support frame 11 and the rubber-like molded product 13 to each other to integrate them.

The support frame 11 is, in this embodiment,
It is formed by using aluminum as a molding material.
The support frame 11 is used for temporarily holding the shape of the rubber-like molded product 13 in cooperation with the connecting ribs 12, and is finally separated from the rubber-like molded product 13 and re-assembled. It can be used. This support frame 11
As shown in FIG.
In FIG. 1A, the engaging structure portion 11B formed in a convex shape is provided over the entire circumferential direction of the support frame 11.

The plurality of connecting ribs 12 are formed of the same material as that of the rubber-like molded product 13, and in the present embodiment, each is formed in a strip shape or a plate shape. Each of the connecting ribs 12 is provided with a connecting frame 12A that connects the outsides thereof to each other. The connecting frame 12A is formed with a recess 12B that can be engaged with the engaging structure portion 11B of the support frame 11, and the inner end of each connecting rib 12 is connected to the rubber-like molded product 13. It is like this. The connecting rib portion 12 is formed to have a wall thickness of 0.5 to 2 mm in this embodiment. It should be noted that the connecting rib 12 is not finally used like the support frame 11 and can be reused as a molding material in the case of a thermoplastic resin after the rubber-like molded product 13 is cut off. You can do it.

The rubber-like molded product 13 is a gasket or cushioning component which is interposed between members such as a coupling member to obtain a predetermined sealing effect or cushioning effect. The molded product 13 is formed integrally with the connecting rib 12 in a separable manner. As shown in FIG. 2, its cross-sectional shape is a horizontally long elliptical shape along the direction in which the connecting ribs 12 extend, but this shape can be changed as appropriate and is not an essential element of the invention. . The rubber-like molded product 13 has a connecting portion between the rubber-like molded product 13 and the connecting rib 12.
As shown in FIG. 2, a wedge-shaped notch groove 15 is formed, and the two are connected through an extremely thin connecting film 12C, whereby a rubber-like molded product 13 is pressed with a predetermined pushing force. Is easily separated from the connecting rib 12, and is accommodated in an appropriate groove on the side of the mounted member (not shown) that constitutes the coupling member or the like. At this time, a thinner portion may be provided in the connecting film 12C in a perforated shape to facilitate separation. The connecting film 12C is preferably provided with a thickness of 0.05 to 0.4 mm.

Next, a method of molding the rubber-like molded product with the support frame according to the first embodiment will be described with reference to FIG.

As shown in FIG. 3, the support frame 11 made of aluminum is inserted into the press-molding die 25 and then press-molded by a usual method, whereby the rubber-like molded product 10 with the support frame is obtained. It is molded. As the molding conditions in this case, a sulfur vulcanization type acrylic rubber is used for the connecting ribs 12 and the rubber-like molded product 13, and a mold temperature of 170
An example is the case where vulcanization is performed under curing conditions of 5 ° C. for 5 minutes and the press pressure is 50 tons.

When performing the press molding in this embodiment, generally, as shown in FIG. 3, the support frame 11 is used.
Burrs 26 are generated due to the material protruding around the burrs, but since they are present via very thin burrs of 20 μm or less, they can be easily removed by pulling them after removing them from the mold 25. Since the position of the burr 26 is fixed, the removal operation itself can be automated without any problem.

As another molding method, an insert injection method using liquid silicone rubber can also be adopted. In this case, a case where the mold temperature is 150 ° C. and the curing time is 1 minute is exemplified. Even in this molding, if the occurrence of burrs on the outside of the support frame 11 poses a problem, 0.2 m around the engagement structure portion 11B formed on the support frame 11.
If a protrusion having a height of about m is provided on the support frame 11 in advance and the protrusion is crushed when the mold 25 is closed to eliminate the clearance on the parting surface, burrs are favorably generated. It is possible to avoid it.

The rubber-like molded product 10 with a support frame formed as described above is held by a transfer means such as a robot arm (not shown) as a whole, and is fixed to a fixed member such as an automobile. It is mounted on the mounting surface of the engine mount of the intake manifold or the exhaust manifold.

After the rubber-like molded product 13 is placed at the predetermined position in this way, a vertically movable pushing jig (not shown) is lowered toward the member to be mounted, and the rubber-like molded product 13 is moved by the pushing jig. By applying a pushing force, the rubber-like molded product 13 can be separated from the connecting rib 12, and only the rubber-like molded product 13 can be press-fitted into a predetermined position of the mounted member.

The support frame 11 and the connecting ribs 12 integrated with the support frame 11 after the separation of the rubber-like molded product 13 is completed are again used as one part for molding the rubber-like molded product with the support frame. Will be provided for use.

Therefore, in the conventional example in which only the rubber-like molded product is formed as a single body, since the shape of the rubber-like molded product is unstable, the ejection pin automatically ejects it from the mold. However, according to the present embodiment, the rubber-like molded product 13 is formed integrally with the support frame 11 via the connecting ribs 12. Since the support frame 11 is relatively robust in shape, it is possible to automatically eject the support frame 11 and thus the entire molding can be automated.

Further, the rubber-like molded product 10 with a supporting frame in this embodiment can be automatically mounted on a member to be mounted through a predetermined conveying means and a pushing jig, so that the manual work is eliminated. As a result, it is possible to better suppress variations in quality such as mounting mistakes, effectively improve mass productivity, and realize a significant reduction in manufacturing cost. In addition, even when the manufacturing site of the rubber-like molded product 10 with a support frame and the site of mounting the rubber-like molded product 10 on a member to be mounted are separated from each other, the supporting frame 11 and the connecting ribs 12 form the rubber-shaped molded product 13 itself in a standard form. It can be expected that the reliability will be ensured and that deformations caused by transportation will be avoided.

Further, the support frame 11 and the connecting ribs 12 are
Since the rubber molded product 13 is removed when the molded product is mounted, and the rubber molded product 13 is collected, the support frame 11 can be reused as it is as a support frame for the next molded product, and the connecting ribs 12 can also be used. It can be melted again and reused, and it is possible to effectively contribute to a large reduction in manufacturing cost in a macroscopic view. Moreover, since the rubber-like molded product 13 used as a gasket or the like does not require the shape supporting member 51 shown in FIG. 7 shown as the conventional example, an O-ring structure can be easily obtained. In addition to the effect of effectively exerting desired waterproofness and the like, restrictions on the design of the mounted member can be relaxed.

Next, a second embodiment of the present invention will be described with reference to FIGS.

In the following description, the same reference numerals will be used for the same or equivalent components as in the first embodiment, and the description will be omitted or simplified.

The second embodiment shown in FIGS. 4 and 5 is
The connecting ribs 12 are provided in a rod shape, and the supporting frame 11 that supports the connecting ribs 12 and thus the rubber-like molded product 13 is entirely surrounded by a connecting frame 12A provided so as to connect the outer sides of the connecting ribs 12 to each other. It is characterized by the fact that it does. The other structure is substantially the same as that of the first embodiment.

The second embodiment as described above has the same effect as that of the first embodiment, and since the connecting rib 12 is formed in a rod shape, the connecting area with the rubber-like molded product 13 is further increased. It is possible to reduce the size, and it is possible to separately add the effect that the rubber-like molded product 13 can be separated with a small pushing force when it is mounted on the mounted member.

Since the support frame 11 is entirely surrounded by the connecting frame 12A, the connecting ribs 12 and the rubber-like molded product 13 are supported even if an unexpected external force is applied. It is possible to reliably avoid the possibility of separation from the frame 11. After the rubber molded product 13 is attached to the mounted member, the connecting rib 12 and the support frame 11 can be easily separated by making an appropriate cut in the outer peripheral region of the support frame 11 using a cutter knife or the like. It can be carried out.

FIG. 6 shows a third embodiment of the rubber-like molded product with a supporting frame according to the present invention. This embodiment relates to a rubber-like molded product 10 with a supporting frame, which is intended for the rubber-like molded product 13 having an area vertically shifted with respect to the virtual horizontal line in the state of FIG. That is,
The mounting surface of the mounted member on which the rubber-like molded product 13 is mounted is
The present embodiment can be particularly well adapted to such a case because it is not limited to a planar one, and even when it has a certain inclined surface or the like, it exists between the actual mechanical parts.

As shown in FIG. 6, the rubber-like molded product 13
Is the upper region 1 located at the top with respect to the virtual horizon
3A and a lower region 13C provided from the upper region 13A via the inclined region 13B. Each of the connecting ribs 12 for connecting the rubber-shaped molded product 13 to the support frame 11 is formed in a substantially triangular shape, and the tip portion located inside thereof is different from the rubber-shaped molded product 13 described above. They are connected in the same manner as in the example.

The support frame 11 has a plurality of groove-shaped engaging structure portions 11B extending in the vertical direction on the inner peripheral surface side, and one of the connecting ribs 12 is formed in the engaging structure portion 11B. The parts are engaged with each other, whereby the support frame 11 and the connecting ribs 12 are integrated.

Therefore, according to the third embodiment as described above, it becomes possible to make the support frame 11 support the rubber-like molded product 13 having the region vertically shifted with respect to the above-mentioned virtual horizontal line. At the same time, rubber-like molded products having various three-dimensional shapes can be targeted, and the effect that the versatility can be expanded can be added separately.

[0046]

As described above, according to the present invention,
A rubber-like molded product whose shape is unstable can always have a stable formability, and a support frame used to secure this formability and a rubber-like molded product can be easily integrally molded. Thus, it is possible to provide a rubber-like molded product with a support frame, which has an unprecedented excellent effect that it can be easily mounted on a predetermined mounted member.

[Brief description of drawings]

FIG. 1 is a first rubber-like molded product with a supporting frame according to the present invention.
3 is an external perspective view showing the embodiment of FIG.

FIG. 2 is an enlarged sectional view taken along the line AA of FIG.

FIG. 3 is a cross-sectional view of a main part in a mold for explaining a method of manufacturing a rubber-like molded product with a support frame in the above-mentioned embodiment.

FIG. 4 is a second rubber-like molded product with a supporting frame according to the present invention.
3 is an external perspective view showing the embodiment of FIG.

5 is an enlarged sectional view taken along the line BB of FIG.

FIG. 6 is a third rubber-like molded product with a supporting frame according to the present invention.
3 is an external perspective view showing the embodiment of FIG.

FIG. 7 is a sectional view showing a conventional gasket with a shape-retaining material.

[Explanation of symbols]

 10 Rubber-Molded Product with Support Frame 11 Support Frame 11B Engagement Structure 12 Connection Rib 12A Connection Frame 13 Rubber-Molded Product 15 Notch Groove

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B29L 31:26 4F

Claims (6)

[Claims] 1. A support frame (11) defined in a predetermined shape.
And a connecting rib (12) arranged in the inner region of the supporting frame (11) and separably integrated with the supporting frame (11), and held via the connecting rib (12). At the same time, the connecting rib (1
A rubber-like molded product with a support frame, comprising a rubber-like molded product (13) integrally formed so as to be detachable from 2). 2. The connecting rib (1) according to claim 1,
2) is a rubber-like molded product with a support frame, which extends substantially horizontally between the support frame (11) and the rubber-shaped molded product (13). 3. The region (13A) according to claim 1, wherein the rubber-like molded product (13) is located on a virtual horizontal line.
And a region (13
A rubber-like molded product with a support frame, characterized in that it has a shape having C). 4. The wedge-shaped notch groove (15) according to any one of claims 1 to 3, wherein a connecting portion (12B) between the connecting rib (12) and the rubber-like molded product (13) is formed. A rubber-like molded product with a supporting frame, which is characterized in that 5. The engagement structure portion (11B) according to any one of claims 1 to 4, wherein the support frame (11) is formed with the engagement structure portion (11B). A connecting frame (12) for connecting the ribs (12) to each other.
A) is engaged and the connecting ribs (12) are attached to the support frame (11).
A rubber-like molded product with a support frame, which is characterized by being integrated into. 6. The support frame (11) according to any one of claims 1 to 4, characterized in that the support frame (11) is surrounded by a connecting frame (12A) interconnecting the connecting ribs (12). A rubber-like molded product with a support frame.