WO2014156574A1

WO2014156574A1 - Method for manufacturing molded article, method for assembling annular resin product, and annular resin product

Info

Publication number: WO2014156574A1
Application number: PCT/JP2014/056106
Authority: WO
Inventors: 克則松木
Original assignee: 内山工業株式会社
Priority date: 2013-03-25
Filing date: 2014-03-10
Publication date: 2014-10-02

Abstract

A method for manufacturing a molded article (1) provided with a substrate (2) comprising a resin material is characterized in including a primary molding step (S1) for integrally molding the substrate (2) and a reinforcing member (4) that can be separated from the substrate (2), a molding process step (S2) for carrying out a molding process on a primary molded article (5) obtained by the primary molding step (S1), and a separation step (S4) for separating the reinforcing member (4) from the substrate (2) after the molding process step (S2). A method for assembling an annular resin product (6) by assembling a resinous annular object (60) with an assembly object (8) is characterized in that the annular object (60) and a reinforcing member (7) that can be separated from the annular object (60) are integrally molded, the annular object (60) is then assembled with the assembly object (8), and the reinforcing member (7) is separated from the annular object (8).

Description

Method for manufacturing molded body, method for assembling cyclic resin product, and cyclic resin product

The present invention relates to a method for manufacturing a molded body, for example, a molded body in which a rubber-like elastic member is molded on a base made of resin.
The present invention also relates to a method of assembling a cyclic resin product and a cyclic resin product. More specifically, the present invention relates to a resin-made thin frame-like annular body by caulking, welding, press fitting, or the like. The present invention relates to an assembly method and a cyclic resin product.

For an oil pan in an automobile engine, a gasket as a molded body in which an annular iron plate is used as a base and a rubber-like elastic member is molded integrally as a seal portion on the outer peripheral side portion of the base may be used (for example, Patent Document 1). Such a gasket is formed by forming an annular base body using an iron plate as a raw material, then placing the molded base body in a predetermined mold, and filling a cavity corresponding to the seal portion with unvulcanized rubber. Manufactured by vulcanization molding.
Conventionally, an annular resin product such as a gasket with a frame for sealing the joint surface between the cover body and the main body is known (see, for example, Patent Document 2).
In various industrial fields, an annular product such as an O-ring is often assembled to an assembly (see, for example, Patent Document 3). In this case, the annular product is gripped by a robot hand or the like, placed at a predetermined position of the assembly, and then assembled by pushing the annular product into an O-ring groove formed on the assembly. Made.

JP 2008-232308 A JP 2000-257719 A JP 2009-291859 A

By the way, in recent years, composite molded bodies used as gaskets as in Patent Document 1 have been required to be lighter and to improve the degree of freedom in shape design. Tried to use. In this case, as a method for producing a molded body having a base made of resin, first, the base is injection molded with resin, demolded, and then placed in a mold for the molding process of the next seal portion, and rubber A manufacturing method is conceivable in which the seal portion is formed by vulcanization molding of the resin, and the base made of resin and the seal portion are combined together. In addition, a manufacturing method is also conceivable in which a desired molded body is obtained by removing the injection-molded substrate and then subjecting the substrate to machining such as drilling. However, when the substrate is annular, in the above manufacturing method, when the resin substrate is removed, there is a possibility that the substrate may be distorted and deformed due to residual strain at the time of molding. If the base is deformed, there is a high possibility that inconvenience will occur when the base is subjected to machining such as drilling or when the base is placed in a rubber molding machine.
Moreover, when it is going to manufacture cyclic resin products like patent document 2 by injection molding, when removing cyclic resin products from a shaping | molding die, cyclic resin products are distorted and deform | transformed by the residual distortion at the time of shaping | molding. A situation may occur. When the annular resin product is deformed, for example, when the annular resin product is gripped using a robot hand as in Patent Document 3, the operation of the robot hand is controlled in consideration of the deformation of the annular resin product. There is a need. In addition, when the annular resin product is correctly assembled, for example, in the assembly groove formed in the assembly, it must be assembled after correcting the deformation of the cyclic resin product, and the assembly work is complicated. become.

The present invention has been made in view of the above circumstances, and when a molded body is manufactured by further molding a resin substrate, the molded body can suppress deformation such as distortion of the substrate at least until the molding process is performed. It aims at providing the manufacturing method of.
In addition, the present invention has been made in view of the above circumstances, and at least the annular body is correctly assembled at a predetermined position by suppressing deformation of the resin-made annular body until the annular body is assembled to the assembly. It is an object of the present invention to provide a method for assembling a cyclic resin product and a cyclic resin product.

The method for producing a molded body according to the present invention includes a primary molding step of integrally molding the base body and a reinforcing member separable from the base body in the method for manufacturing a molded body having a base made of a resin material, and the primary molding. It includes a molding process step of performing a molding process on the primary molded body obtained by the process, and a separation step of separating the reinforcing member from the base body after the molding process step.

According to this invention, the rigidity of the base is enhanced by the reinforcing member, and the base can be prevented from being deformed after the primary molding step. And since a reinforcement process is made in a state where a reinforcement member is united with a base, it can control that a problem resulting from modification of a base arises until a forming process is made.

In the method for producing a molded body of the present invention, in the primary molding step, the base is molded into an annular shape, and in the molding processing step, the primary molded body is disposed in a molding die, and a rubber-like elastic member is disposed on the base. It may be a secondary molding step of molding
According to this invention, even when the rubber-like elastic member is molded on the base, the reinforcing member can suppress the base from being thermally deformed by the influence of heat when the rubber-like elastic member is molded.

In this case, the rubber-like elastic member is vulcanized rubber, and after the secondary molding step, the primary molded body is taken out from the molding die in a state where the reinforcing member and the base body are integrated. You may make it implement the heating process which heats the said rubber-like elastic member.
According to this invention, when heating is performed for secondary vulcanization, thermal deformation of the substrate due to vulcanization heat can be suppressed by the reinforcing member.

In this case, further, in the primary molding step, the reinforcing member may be molded into a shape so as to be bridged inside the base body.
According to the present invention, when the rubber-like elastic member is molded on the base, even if an inward stress is applied to the base, deformation of the base can be suitably suppressed by the reinforcing member.

In this case, furthermore, in the primary molding step, the reinforcing member is formed with a projection that protrudes in the axial direction of the base from the base, and after the primary molding step, the projection is formed into another primary molding. A plurality of the primary molded bodies may be aligned so as to abut against the reinforcing member of the body, and then the secondary molding step may be performed.
According to this invention, when aligning a plurality of primary compacts in an axial direction, it can control that bases interfere.

In the method for manufacturing a molded body according to the present invention, the base body includes a partial annular portion in which a part of the annular shape is lacked, and a suspension portion spanned inside the partial annular portion, and in the primary molding step, The reinforcing member may be formed integrally with the base so as to compensate for the lack of the partial annular portion.
According to the present invention, it is possible to suppress the deformation of the base body even in the case of manufacturing a molded body that lacks a part of the annular shape.

An assembly method for a cyclic resin product according to the present invention is the method for assembling a cyclic resin product in which a resin-made annular body is assembled to an assembly, wherein the annular body and a reinforcing member separable from the annular body are integrated. Then, the reinforcing member is separated from the annular body after the annular body is assembled to the assembly.
According to the present invention, since the annular body is provided with the reinforcing member until the annular body is assembled to the assembly, the annular body is assembled to the assembly with the deformation of the annular body suppressed. be able to. Therefore, the annular body can be correctly assembled at a predetermined position of the assembly without complicating the assembly work of assembling the annular body to the assembly.

In the present invention, the annular body may be assembled to the assembly by supporting the reinforcing member, arranging the annular body on the assembly, and performing caulking.
According to the present invention, since the caulking can be performed in a state where the deformation of the annular body is suppressed by the presence of the reinforcing member, the caulking work can be easily performed.

In the present invention, the annular body is provided with a plurality of through holes capable of press-fitting a plurality of pins provided in the assembly, and supports the reinforcing member and is disposed in the assembly. You may make it assemble | attach the said cyclic | annular body to the said to-be-assembled body by press-fitting the said pin to the said through-hole, and heat-caulking the said pin.
According to this invention, it can suppress that the positional relationship of a pin and a through-hole shift | deviates by presence of a reinforcement member. Therefore, the work of press-fitting the pin into the through hole is accurately performed. Further, when heat caulking, even if the annular body is affected by heat, the annular body can be prevented from being thermally deformed.

In the present invention, the annular body may be assembled to the assembly by supporting the reinforcing member, arranging the annular body on the assembly, and performing a welding process.
According to the present invention, since the welding process can be performed in a state where the deformation of the annular body is suppressed due to the presence of the reinforcing member, the welding work can be easily performed.

In the present invention, by supporting the reinforcing member, the annular body is disposed in a recess formed in the assembly, and the annular body is assembled to the assembly by press-fitting into the recess. You may make it attach.
According to the present invention, the press-fit operation can be easily performed because the press-fit assembly can be performed in a state where the deformation of the annular body is suppressed due to the presence of the reinforcing member.

In the present invention, the reinforcing member is formed with a protruding portion that protrudes in the axial direction of the annular body rather than the annular body. After the annular body and the reinforcing member are integrally formed, the protruding portion is formed into another annular shape. A plurality of the annular bodies may be aligned so as to abut against the reinforcing member of the body, and then the assembly of the annular body to the assembly to be assembled may be performed.
ADVANTAGE OF THE INVENTION According to this invention, when aligning a some annular body to an axial direction, it can suppress that an annular body interferes.

The annular resin product according to the present invention is an annular resin product provided with a resin-made annular body assembled to an assembly, and the annular body is integrally formed with a separable reinforcing member, The annular body is separated from the annular body in a state where the annular body is assembled to the assembly.
According to the present invention, since the reinforcing member is separated in a state where the annular body is assembled to the assembly body, the annular member is reinforced by the reinforcing member, and the deformation is suppressed in a state where deformation is suppressed. It is assembled correctly at the position.

According to the method for producing a molded body of the present invention, when a molded body is manufactured by further molding a resin substrate, deformation such as distortion of the substrate can be suppressed at least until the molding process is performed.
Moreover, according to the assembly method of the cyclic resin product and the cyclic resin product of the present invention, the annular body is suppressed by suppressing deformation of the resin-made annular body until at least the annular body is assembled to the assembly. It can be correctly assembled at a predetermined position.

It is a schematic plan view which shows one Embodiment of the molded object obtained by the manufacturing method of the molded object which concerns on this invention. (A) is an AA arrow expanded sectional view in FIG. 1, (b) is sectional drawing which shows the modification of (a). It is process drawing which shows an example of the manufacturing method of the molded object which concerns on this invention. (A) (b) is a schematic plan view which shows the molded object obtained by each process shown to the same process drawing, (a) is the primary molded object obtained at a primary molding process, (b) is secondary molding. The secondary molded bodies obtained in the steps are respectively shown. FIG. 5 is a schematic partial cutaway longitudinal sectional view of a molding apparatus corresponding to the BB line arrow portion of FIG. 4 (a), showing the molding procedure by the molding apparatus in the primary molding step shown in FIG. 3. FIG. 5 is a schematic partial cutaway longitudinal sectional view of a molding apparatus corresponding to a CC line arrow portion of FIG. 4 (b), showing a molding procedure by the molding apparatus in the secondary molding step shown in FIG. 3. The other form of the primary molded object obtained at the primary shaping | molding process of the manufacturing method is shown, (a) is a schematic plan view of the primary molded object, (b) is the state which laminated | stacked the multiple primary molded object. It is sectional drawing corresponding to the DD arrow line part of (a). (A) (b) is a schematic plan view which shows the other form of the secondary molded object obtained by the secondary shaping | molding process by the manufacturing method. (A) (b) is a schematic plan view which shows the further another form of the secondary molded object obtained by the secondary shaping | molding process by the manufacturing method. It is a schematic plan view which shows an example of the cyclic resin product used for the assembly method of the cyclic resin product which concerns on this invention. It is a perspective view which shows an example of the to-be-assembled body used for the assembly method of the same cyclic resin product. It is process drawing which shows an example of the assembly | attachment method of the cyclic resin product which concerns on this invention. FIG. 11 is an enlarged cross-sectional view showing a point of molding of the cyclic resin product shown in FIG. FIG. 11 is a cross-sectional view corresponding to the section taken along line AA in FIG. 10, showing a state where the annular resin product shown in FIG. 10 is assembled to the assembly shown in FIG. 11 and then the reinforcing member is separated. It is a schematic plan view which shows another example of the cyclic resin product used for the assembly method of the cyclic resin product which concerns on this invention. It is a perspective view which shows an example of the to-be-assembled body used for the assembly method of the same cyclic resin product. FIG. 16 is a cross-sectional view corresponding to the section taken along line BB in FIG. 15, showing a state in which the reinforcing member is separated after the annular resin product shown in FIG. 15 is assembled to the assembly shown in FIG. 16. It is a schematic plan view which shows another example of the cyclic resin product used for the assembly method of the cyclic resin product which concerns on this invention. (A) (b) is a schematic plan view which shows another example of the cyclic resin product used for the assembly method of the cyclic resin product which concerns on this invention. The modification of the cyclic resin product used for the assembly method of the cyclic resin product according to the present invention is shown, (a) is a schematic plan view of the cyclic resin product, and (b) is a laminate of the cyclic resin products. It is sectional drawing corresponding to CC line arrow part of (a) of the state which carried out.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic plan view showing an embodiment of a molded body obtained by the method for manufacturing a molded body according to the present invention, and FIG. 2 (a) is an enlarged sectional view taken along line AA in FIG. Show. A molded body 1 shown in the figure is, for example, a gasket interposed between an engine block and an oil pan (both not shown) as two members to be sealed in an internal combustion engine. The illustrated molded body 1 is schematically shown as a rectangular annular body in plan view for convenience, but is actually shaped to match the shape of the adaptation site. A molded body 1 according to this embodiment includes a plate-like and annular base body 2 made of a synthetic resin molded body, and a rubber-like elastic member 3 molded integrally on the outer peripheral edge of the annular base body 2 over the entire circumference. It consists of. The rubber-like elastic member 3 shown in FIG. 2A is integrally formed by vulcanizing and molding an unvulcanized rubber material on the outer peripheral edge of the base 2 as will be described later. The rubber-like elastic member 3 includes a base 31 that is integrated with the outer peripheral side portion and a part of the end surface of the base 2 and a lip-like portion 32 that projects obliquely outward from the base 31. FIG. 2B shows a modification of the rubber-like elastic member 3 in this example. The rubber-like elastic member 3 includes a base portion 33 that is integrated so as to wrap around the outer peripheral edge portion of the base 2 and a thickness direction of the base 2. It is formed in a grommet shape from

bead portions

34, 34 projecting on both sides. The gasket 1 as such a molded body is interposed between the two members to be sealed as a final product as described above, and the rubber-like elastic member 3 is compressed by the tightened joint of the two members. The two members are sealed by the compression reaction force.

An example of a method for manufacturing the molded body 1 will be described with reference to FIGS. In FIG. 3, a primary molding step S1 is a step of molding the base 2 with a synthetic resin. In this molding step, the base 2 and a reinforcing member 4 (see FIG. 4) that can be separated from the base 2 are integrated. To be molded. Fig.4 (a) has shown the primary molded object 5 obtained by this primary shaping | molding process S1. In the primary molded body 5, a cross-shaped reinforcing member 4 is integrally formed on the inner side of the rectangular annular base 2. The cross-shaped reinforcing member 4 is formed so as to be connected to the inner side of each side portion 200 of the rectangular base body 2 and to be bridged inside the base body 2. The reinforcing member 4 and each side portion 200 of the base body 2 are connected to each other through a broken portion 41 having a small cross section. The reinforcing member 4 is configured to be easily cut and removed when separated from the base body 2 as will be described later.

FIG. 5 shows a procedure for molding the primary molded body 5 with a primary molding apparatus. A primary molding apparatus 10 shown in FIG. 5 is an injection molding apparatus for synthetic resin, and includes a lower mold 11 and an upper mold 12, and corresponds to the shape of the primary molded body 5 in the mold-clamped state of both

molds

11 and 12. A cavity 13 is formed. The cavity 13 includes an annular portion 13 a corresponding to the annular base body 2, a narrowed portion 13 b corresponding to the fracture portion 41, and a cross-shaped portion 13 c corresponding to the cross-shaped reinforcing member 4. The cross-shaped portion 13c communicates with the annular portion 13a through the narrowed portion 13b. A resin injection sprue 14 is provided on the upper mold 12 at a portion corresponding to the crossing portion 13d of the cross-shaped portion 13c. Since the reinforcing member 4 formed by the cross-shaped portion 13c is finally separated and removed as will be described later, the cross-shaped portion 13c and the narrowed portion 13b are used for forming the base body 2, respectively. Can be used as a runner and gate.

In the primary molding apparatus 10 shown in FIG. 5, the molten resin r is injected from the sprue 14 of the upper mold 12 clamped to the lower mold 11 and molded into a shape corresponding to the cavity 13. By doing so, a primary molded body 5 as shown in FIG. 4A is obtained. The primary molded body 5 is composed of a rectangular base body 2 in plan view and a cross-shaped reinforcing member 4 integrally connected to each side part 200 of the base body 2 via breakage parts 41. . The base 2 is formed from a thin plate-like resin material and is formed in a thin frame shape. Therefore, the base body 2 has a low rigidity and can be easily bent and deformed. The fracture | rupture part 41 is formed in the shape which can be easily cut | disconnected with cutting tools, such as a nipper. The reinforcing member 4 has higher rigidity than the base 2 in order to restrict the base 2 from being distorted or twisted inward. The reinforcing member 4 is bridged so that a pair of bar-

like portions

40, 40 having a cross shape are orthogonal to the side portions 200 of the base 2. In the process from this molding to demolding and further to the next secondary molding step S2, the rigidity of the base 2 is enhanced by the reinforcing member 4, so that the residual strain is formed even though the base 2 is made of resin. Can be prevented from being deformed. Further, even if an unexpected external force is applied to the substrate 2 during demolding, storage after demolding, or transport to the secondary molding step S2, deformation of the substrate 2 is suppressed.

And the rubber-like elastic member 3 is shape | molded in the secondary shaping | molding process S2 as a shaping | molding process process with respect to the primary molded object 5 obtained by primary shaping | molding process S1. FIG. 6 shows a procedure for molding the rubber-like elastic member 3 on the base body 2 of the primary molded body 5 by a secondary molding apparatus. A secondary molding apparatus 20 shown in FIG. 6 is an injection molding apparatus that vulcanizes and molds an unvulcanized rubber material, and includes a lower mold 21 and an upper mold 22. In the mold clamping state of both

molds

21 and 22, a cavity 23 is formed which can accommodate the base 2 and the reinforcing member 4 and can be filled with an unvulcanized rubber material. The cavity 23 includes a first housing portion 23a for fitting and housing the base body 2 of the primary molded body 5, and a rubber filling portion 23b having a shape corresponding to the shape of the rubber-like elastic member 3 connected to the first housing portion 23a. And a second housing portion (not shown) that houses the reinforcing member 4. An unvulcanized rubber injection sprue 24 is connected to the rubber filling portion 23b via a runner (not shown). Further, the lower mold 21 and the upper mold 22 are assembled with heaters (not shown) for heating both

molds

21 and 22 to vulcanize the unvulcanized rubber material.
In the present embodiment, the secondary molding apparatus 20 is an injection molding apparatus, but may be a compression molding apparatus that compression-molds a rubber material placed on the base 2.

When molding the rubber-like elastic member 3 using the secondary molding apparatus 20 shown in FIG. 6, first, the reinforcing member 4 is gripped by gripping means such as a robot hand (not shown), and the primary molded body 5 The base 2 is accommodated in the first accommodating portion 23 a of the lower mold 21. At this time, the base body 2 is prevented from being deformed due to the residual strain in the primary molding step S1, so that the base body 2 can be fitted and stored in the first storage portion 23a accurately. When the base body 2 is fitted into the first accommodating portion 23a, the rigidity of the primary molded body 5 (base body 2) is increased by the reinforcing member 4, and therefore, when the base body 2 is carried into the secondary molding apparatus 20 by the robot hand. Even when stress is applied, the base 2 is not easily deformed.

Next, the upper die 22 is clamped to the lower die 21, and an unvulcanized rubber material g is injected from the sprue 24 to fill the rubber filling portion 23b. In parallel, the lower mold 21 and the upper mold 22 are heated to vulcanize and mold the filled rubber material g. In this embodiment, this vulcanization is primary vulcanization, and the rubber material g is integrally formed on the outer peripheral edge portion of the base 2, and the molded body is removed from the secondary molding apparatus 20 after demolding. . The rubber material g is formed so as to follow the shape of the rubber filling portion 23b. A secondary vulcanization process as a heating process in which the molded body in the primary vulcanized state is introduced into an oven (not shown) and the rubber material g in the primary vulcanized state is secondarily vulcanized (heated again) at a predetermined temperature. S3 is performed. In other words, in this secondary vulcanization step S3, heat treatment is performed in which the rubber material g is put in a temperature state in which the vulcanization reaction of the rubber material g proceeds, so that the rubber material g is brought into a suitable vulcanized state.

In the secondary molding step S2, the injection pressure of the rubber material g acts on the base 2, and at this time, the base 2 is prevented from being deformed by being reinforced by the reinforcing member 4. In addition, even when the base body 2 is affected by heat during the secondary molding step S2, it is suppressed from being deformed when being removed. Furthermore, in the secondary vulcanization step S3, a high temperature is applied to the base 2 and the reinforcing member 4, but since the base 2 is reinforced by the reinforcing member 4 and has high rigidity, deformation due to thermal strain is suppressed. In this state, secondary vulcanization is performed. In particular, since the reinforcing member 4 is connected so as to be orthogonal to the side portions 200 of the rectangular base body 2, the deformation of the base body 2 due to the thermal strain is effectively suppressed.

When the secondary molding step S2 and the secondary vulcanization step S3 are completed, a secondary molded body 6 as shown in FIG. 4B is obtained. The secondary molded body 6 is obtained by integrating the rubber-like elastic member 3 over the entire periphery of the outer peripheral edge of the base body 2 in the primary molded body 5 obtained in the primary molding step S1. After the secondary vulcanization step S3, when the secondary molded body 6 is in a room temperature state, the reinforcing member 4 is separated from the base 2 by cutting the fractured portion 41 in the reinforcing member separation step S4. And the molded object 1 as shown to Fig.2 (a) is obtained.
The molded body 1 shown in FIG. 2B is similarly manufactured by matching the shape of the cavity 23 of the secondary molding apparatus 20 in the secondary molding step S2 with the shape of the rubber-like elastic member 3 of the molded body 1. can do.

FIG. 7 shows another embodiment of the primary molded body obtained in the primary molding step of the manufacturing method of the present embodiment. In this embodiment, the primary molded body 5 obtained in the primary molding step S <b> 1 has a cross-shaped reinforcing member 4 composed of a pair of rod-

like portions

40, 40 in the same manner as described above, rather than any part of the base 2. It has the protrusion part 42 which protrudes in the axial direction of the base | substrate 2. It is characterized by the above-mentioned. In the illustrated example, the protrusions 42 are formed in parallel and with the same dimensions so as to stand up on the reinforcing member 4 at four locations in the vicinity of the respective rupture portions 41. The protrusions 42 are simultaneously molded together with the base 2 and the reinforcing member 4 in the primary molding step S1. The protrusion 42 has a flat tip surface. Then, after the primary molding step S1, a plurality of the primary molded bodies 5 obtained are brought into the secondary molding step S2 in an aligned state so as to be stacked as shown in FIG. Thereafter, the rubber-like elastic member 3 is molded for each primary molded body 5 in the same manner as described above. When aligning the plurality of primary molded bodies 5, the other primary molded bodies 5 are supported by bringing the protrusions 42 into contact with the reinforcing members 4 of the other primary molded bodies 5. Next, in the secondary vulcanization step S3, the plurality of primary molded bodies 5 are aligned in the lateral direction, and introduced into an oven (not shown) in that state, and the rubber-like elastic member 3 is secondary vulcanized. After the secondary molding step S2, the reinforcing member 4 is separated by cutting together with the protrusions 42, and the molded body shown in FIG. 1 is obtained in the same manner.

In the carrying-in or storage process of this embodiment, since the projections 42 have a spacer function, the bases 2 do not interfere with each other, the bases 2 are prevented from being damaged, and the shape of the primary molded body 5 is maintained. And the deformation is more effectively suppressed. Moreover, in secondary vulcanization | cure process S3 of this embodiment, it can avoid that the rubber-like elastic member 3 contacts other rubber-like elastic members 3 because the projection part 42 has a spacer function.
In the illustrated example, a plurality of primary molded bodies 5 are aligned so as to be stacked one above the other in a flat state. However, the primary molded bodies 5 are aligned so as to be vertically stacked in the horizontal direction. May be. When the plurality of primary molded bodies 5 are aligned and stored or transported in this way, it is convenient to prepare a dedicated tray and align it with the tray, for example. Alternatively, the primary molded body 5 may be aligned so that the protrusions 42 are stacked below the base body 2 and function as the legs of the primary molded body 5.

FIGS. 8A and 8B are schematic plan views showing other forms of the secondary molded body obtained in the secondary molding step according to the manufacturing method of the present embodiment. In this example, the shape of the primary molded body 5 obtained in the primary molding step S1 (see FIG. 3), specifically, the shape of the reinforcing member 4 is different from the above example. That is, the reinforcing member 4 has an H-shape composed of three rod-

like portions

40, 40, 40 in the example of FIG. (A), and the two rod-

like portions

40, 40 intersect in the example of FIG. Both are X-shaped, and are connected to opposing

long side portions

200 a and 200 a of the rectangular base body 2 via a break portion 41. In such a primary molded body 5, the shape of the narrowed portion 13 b and the cross-shaped portion 13 c of the cavity 13 in the molding apparatus 10 shown in FIG. 5 corresponds to the shape of the reinforcing member 4 shown in FIGS. It shape | molds with the shaping | molding apparatus set up like this. Also in this case, a resin injection sprue (not shown) is provided at a portion corresponding to the central portion of each reinforcing member 4 so that the base 2 and the reinforcing member 4 are integrally formed. Then, as shown in FIG. 3, the rubber-like elastic member 3 is integrated with the outer peripheral edge of the base 2 over the entire periphery of the primary molded body 5 by the secondary molding step S2 and the secondary vulcanization step S3 as shown in FIG. The secondary molded body 6 as shown in the figure is obtained. In the secondary molded body 6, the reinforcing member 4 is cut at the breaking portion 41 and separated from the base body 2 in the same manner as described above (the reinforcing member separating step S <b> 4 in FIG. 3), thereby forming the molded body 1 similar to FIG. 1. The
Since the other configuration is the same as that of the example shown in FIG. 4B, the same reference numerals are given to the common parts, and the description thereof is omitted.

9 (a) and 9 (b) are schematic plan views showing still other forms of the secondary molded body obtained in the secondary molding step according to the manufacturing method of the present embodiment. In this example, the shape of the primary molded body 5 obtained in the primary molding step S1 (see FIG. 3), specifically, the shapes of the base 2 and the reinforcing member 4 are different from the above example. More specifically, in the example shown in FIG. 9A, the base body 2 is formed in a rectangular shape in plan view. The base body 2 includes a partial annular portion 2a in which a part of the annular shape is missing, and a suspension portion 2b spanned inside the partial annular portion 2a. In other words, the base 2 has a straight suspension portion 2b spanning the opposing

long side portions

200a and 200a, while lacking

portions

2c and 2c are formed on the opposing

short side portions

200b and 200b, respectively. Yes. And the said reinforcement member 4 is shape | molded integrally with the said base | substrate 2 so that the lack part 2c of the said partial annular part 2a may be supplemented. The reinforcing member 4 is connected to the end surface of the lacking portion 2c in the partial annular portion 2a via the fracture portion 41. The primary molded body 5 is configured such that an annular shape is formed by the reinforcing member 4 and the partial annular portion 2a.

In the example shown in FIG. 9 (b), the base body 2 has a square shape, a cross-shaped suspension part 2b is integrally bridged on each side part 200, and the base body 2 has a missing portion at one of its corners. 2c is formed as a partial annular portion 2a. The reinforcing member 4 is integrally connected to the end surface of the missing portion 2c in the partial annular portion 2a through the fracture portion 41 so as to supplement the missing portion 2c. The primary molded body 5 is configured such that an annular shape is formed by the reinforcing member 4 and the partial annular portion 2a.

The secondary molded body 6 shown in FIGS. 9 (a) and 9 (b) is obtained by performing the partial annular portion 2a on the primary molded body 5 by the secondary molding step S2 and the secondary vulcanization step S3 in FIG. The rubber-like elastic member 3 is integrally formed on the outer peripheral edge of the entire circumferential direction. In these examples as well, in the process from the molding in the primary molding step S1 to the demolding and further to the next secondary molding step S2, the rigidity of the base 2 is increased by the reinforcing member 4. Therefore, it can suppress that the base | substrate 2 which consists of resin deform | transforms with a residual strain. Even if an external force is applied during demolding, storage after demolding, or transport to the secondary molding step S2, the base 2 is reinforced by the reinforcing member 4, so that deformation of the base 2 is suppressed. . Furthermore, deformation due to thermal strain hardly occurs in the secondary molding step S2 and the secondary vulcanization step S3. And since the base | substrate 2 is equipped with the suspension part 2b, it can reinforce by this suspension part 2b and can suppress generation | occurrence | production of a deformation | transformation more effectively.

In such a primary molded body 5, the cavity 13 in the molding apparatus 10 shown in FIG. 5 includes the base body 2 composed of the partial annular portion 2a and the suspension portion 2b, and the reinforcing member 4 connected to the partial annular portion 2a via the fracture portion 41. It is molded by a molding apparatus set to a shape corresponding to the shape of. In this case, a resin injection sprue (not shown) is provided at a portion corresponding to the central portion of each suspension portion 2b, and the base 2 and the reinforcing member 4 are integrally formed. Then, the rubber-like elastic member 3 is integrally molded over the entire outer peripheral edge of the base body 2 by the secondary molding step S2 and the secondary vulcanization step S3 as shown in FIG. Thus, the secondary molded body 6 as shown in the drawing is obtained. In the secondary molded body 6, the reinforcing member 4 is cut at the fracture portion 41 and separated from the base 2 in the same manner as described above (the reinforcing member separating step S <b> 4 in FIG. 3), and a part of the base 2 is missing. It is a molded body. In the molded product as the final product, since the reinforcing member 4 is separated and a part of the base body 2 is missing, when applied to a member having a protruding portion on the sealing surface, the protruding portion is avoided. The substrate 2 having a shape can be manufactured. More specifically, such a molded body includes, for example, a gasket (in particular, the example of FIG. 9A) that seals a combined portion of a chain case and a cylinder block in an internal combustion engine, and a cylinder head and a head cover. In between, it is used as a gasket combined with a semi-circular.

In the present embodiment, in the example of FIG. 9B, an example in which the missing portion 2c is formed at one corner portion of the base 2 is shown. However, the base having the entire side of the base 2 as the missing portion 2c is shown. 2 is also acceptable. In addition, the suspension portion 2b in the example of FIG. 9 (b) may be cut off at the fracture portion 2ba as necessary, similarly to the reinforcing member 4, after the secondary molded body 6 is obtained. That is, the suspension part 2b may be connected to the partial annular part 2a via the breaking part 2ba.

In the embodiment, the example in which the molding process is the secondary molding step S2 for molding the rubber-like elastic member 3 on the base body 2 is shown. In this embodiment, the molding process may be a mechanical process that performs processing such as drilling, cutting, threading, and chamfering on the base body of the primary molded body. Even in this case, the rigidity of the base body of the primary molded body is increased by the reinforcing member, and in the primary molding step, when the primary molded body is removed, deformation of the base body due to residual strain during molding is suppressed. Inconveniences in the mechanical processing process are less likely to occur. Therefore, the molded product as the final product obtained by separating the reinforcing member maintains the expected shape, and the concern that the problem of assembling with respect to the assembling target or the like may be suppressed.

Further, the portion of the base 2 on which the rubber-like elastic member 3 is integrally molded is not particularly limited. For example, the rubber-like elastic member 3 may be integrally formed only on the upper end surface of the base 2. Furthermore, the time for separating the reinforcing member 4 may be any time after the molding process is performed. For example, after the molding process is performed, the reinforcing member 4 may be separated after various processes are performed on the molded body, or the reinforcing member 4 may be separated in the middle. The method for separating the reinforcing member is not particularly limited. It may be performed by an automatic device such as a robot, or may be performed manually. Further, the position of the resin injection sprue is not particularly limited, and may be changed as appropriate. Furthermore, the cavity for forming the reinforcing member 4 may not serve as a runner and a gate for forming the base 2. For example, when a plurality of primary molded bodies 5 are molded by a single mold, a cavity for forming each primary molded body is provided separately from a runner that is supplied toward the cavities that form each primary molded body 5. It may be formed.

Further, the secondary molding step S2 in the above embodiment is a step of vulcanizing and molding an unvulcanized rubber material, but it may be a step of molding another elastomer such as an elastic resin. Further, the shapes of the base 2, the reinforcing member 4, and the rubber-like elastic member 3 shown in the figure are not limited to those illustrated, and may be designed according to the shape of the assembly target of the molded body 1 as the final product. Needless to say, it is set appropriately. For example, as the shape of the reinforcing member 4, a plate-like member arranged in the rectangular base 2 and connected to the inner side of the base 2 by a plurality of linear portions can be adopted. Furthermore, although the molded object 1 provided with the rubber-like elastic member 3 showed the example which is a gasket for internal combustion engines, it may be industrial parts other than the gasket applied to an electronic device etc. or a gasket.

Hereinafter, an assembly method of a cyclic resin product and an embodiment of the cyclic resin product according to the present invention will be described based on the drawings. FIG. 10 is a schematic plan view showing an example of the cyclic resin product used in the method for assembling the cyclic resin product according to the present invention. An annular resin product 6 shown in FIG. 10 has a rectangular thin frame-like annular body 60, and an inward tag 62 is provided at the center of the inner side of each side portion 61 constituting the annular body 60. Is formed. The annular body 60 is formed in a thin plate shape, in other words, a thin frame shape. Therefore, the annular body 60 is formed in a shape that has low rigidity and is easily bent and deformed. The plurality of tags 62 are integrally formed with a cross-shaped reinforcing member 7 in plan view through a broken portion 70 formed thinner than the annular body 60. Each of the tags 62 corresponds to a plurality of pins 81 (four in this embodiment) formed on the assembly 8 (see FIG. 11) to be described later, and the pins 81 are press-fitted. Possible through holes 63 are provided. The fracture | rupture part 70 is formed in the shape which can be cut | disconnected with cutting tools, such as a nipper. The reinforcing member 7 has higher rigidity than the annular body 60 in order to restrict the annular body 60 from being distorted or twisted. The reinforcing member 7 includes a pair of rod-

like portions

7 a and 7 b that form a cross-shaped shape, and the rod-

like portions

7 a and 7 b are bridged so as to be orthogonal to the side portion 61 of the annular body 60.

FIG. 11 shows an assembled body 8 to which the annular resin product 6 is assembled. The illustrated assembled body 8 includes a rectangular parallelepiped hollow box 80 whose one surface (upper surface) is open, And a plurality of pins 81 provided on the upper surface of the box 80. The box 80 is made of a metal material or a resin material. The pin 81 is made of a material that can be deformed by heat caulking, and is provided at a predetermined portion on the upper surface of the box 80. The outer surface of the annular body 60 is shaped to match the outer edge of the box body 80 when the annular body 60 is assembled to the upper surface of the box body 80 as described later. The through holes 63 are provided at positions corresponding to the pins 81 in the assembled state. The inner surface of the annular body 60 is shaped to be located outside the opening edge 80 a of the box body 80 when the annular body 60 is assembled to the upper surface of the box body 80.

A procedure for molding and assembling the annular resin product 6 as described above to the assembly 8 will be described with reference to FIGS. In the molding process P1 of the annular resin product 6, the annular body 60 and the reinforcing member 7 are integrally molded. FIG. 13 shows a procedure for molding the annular resin product 6 by a molding apparatus. A molding apparatus 9 shown in FIG. 13 is an injection molding apparatus, and includes a lower mold 91 and an upper mold 92, and a cavity 93 corresponding to the shape of the annular resin product 6 is formed when both

molds

91 and 92 are clamped. Is done. The cavity 93 includes an annular portion 93 a corresponding to the annular body 60, a tag-shaped portion 93 b corresponding to the tag 62, and a cross-shaped portion 93 c corresponding to the cross-shaped reinforcing member 7. A resin injection sprue 94 is provided on the upper mold 92 at a portion corresponding to the intersecting portion 93d of the cross-shaped portion 93c. Since the reinforcing member 7 formed by the cross-shaped portion 93c is finally separated and removed as described later, the cross-shaped portion 93c is used for forming the annular body 60 and the tags 62. It can be said that it corresponds to a runner.

In the molding apparatus 9 shown in FIG. 13, the molten resin r is injected from the sprue 94 and molded into a shape corresponding to the cavity 93, and then the reinforcing member 7 is gripped to form the annular resin product 6. The cyclic resin product 6 as shown in FIG. When the annular resin product 6 is removed from the mold, the annular body 60 may be distorted and deformed due to residual strain at the time of molding. However, since the annular body 60 is reinforced by the reinforcing member 7, such deformation may occur. It is suppressed.

Next, this cyclic resin product 6 is assembled to the assembly 8 as shown in FIG. 11 (assembly process P2 to the assembly). At the time of this assembly, as shown in FIG. 14, the reinforcing member 7 is gripped by the robot hand m, the annular resin product 6 is transported and positioned on the assembly 8 and the through holes 63 and the pins are gripped. Alignment with 81 is performed. Then, the annular resin product 6 is lowered toward the assembly 8 and the through holes 63 are press fitted into the pins 81 (the pins 81 are press fitted into the through holes 63).

Thereafter, in the present embodiment, each pin 81 is heat caulked to fix the tags 62 to the upper surface of the assembly 8. As shown in the enlarged portion of FIG. 14, the pin 81 is melted and deformed from an original shape indicated by a two-dot chain line into a bowl shape as indicated by a solid line so that the tag 62 is clamped on the upper surface of the assembly 8. Secure to. The heat caulking process is performed by pressing the pin 81 into the tag 62 and then hitting the pin 81 with a hammer or the like while heating the pin 81.

Thereafter, in the separation step P3 of the reinforcing member, each fractured portion 70 is cut by the cutting tool provided in the robot, and the reinforcing member 7 is separated. Thereby, the assembly of the resin annular body 60 to the assembly 8 is completed. FIG. 14 shows a state in which the annular resin product 6 is assembled to the assembly 8 in the above-described manner and the reinforcing member 7 is separated. The annular body 60 is subjected to heat caulking of the pins 81. It is assembled and fixed to the assembly 8 so that it cannot be detached.
It should be noted that the annular body 60 may be assembled and fixed to the assembled body 8 through the pins 81... In a snap-fit manner or an E-ring instead of the heat caulking of the pins 81.

In the present embodiment, the transfer and press-fitting operations are performed in a state where the reinforcing member 7 is gripped by the robot hand m. Therefore, the annular body 60 is not damaged by the robot hand m in the course of the transfer and press-fitting operations. Further, since the deformation of the annular resin product 6 is suppressed, it is not necessary to control the operation of the robot hand m in consideration of the deformation of the annular resin product 6 when the reinforcing member 7 is gripped by the robot hand m.
And until the annular body 60 is assembled | attached to the to-be-assembled body 8, since the annular body 60 has the reinforcement member 7, it attaches to the to-be-attached body 8 in the state which suppressed the deformation | transformation of the annular body 60. Can do. In particular, the positional relationship between the pins 81... And the through holes 63 is difficult to shift, and the press-fitting operation of the pins 81 to the through holes 63. Further, during the press-fitting operation of the pin 81, a strong stress acts on the annular body 60. However, since the reinforcing member 7 is integrated with the annular body 60, the deformation of the annular resin product 6 is suppressed. The press-fitting operation is performed. In addition, since the deformation of the annular resin product 6 is suppressed, it is not necessary to perform the assembling operation by press-fitting after correcting the deformation of the annular resin product 6. Accordingly, the annular body 60 can be correctly assembled at a predetermined position of the assembly 8 without complicating the assembling work of the annular body 60.
Further, when the heat caulking process is performed, a strong stress such as a deformation due to strain or the like acts on the annular body 60. However, since the annular body 60 is reinforced by the reinforcing member 7, the annular resin product 6 is fixed at a predetermined position in a state where deformation of the annular body 60 is suppressed.

15 to 17 show other examples of the method for assembling the cyclic resin product according to the present invention. An annular resin product 6A shown in FIG. 15 includes an annular annular body 60A, and a cross-shaped reinforcing member 7A composed of rod-shaped portions 7Aa and 7Ab integrally formed on the inner side of the annular body 60A via a fracture portion 70A. Consists of. This cyclic resin product 6A is similarly molded by the molding apparatus 9 shown in FIG. 13 provided with a cavity corresponding to the cyclic resin product 6A. Therefore, since the annular body 60A is reinforced by the reinforcing member 7A, the annular resin product 6A is in a state in which the deformation at the time of demolding is suppressed as described above. FIG. 13 shows an assembled body 8A to which the annular resin product 6A is assembled. The assembled body 8A includes a hollow cylindrical body 80A, and an annular recess is formed in the upper end opening of the cylindrical body 80A. The location 81A is formed in a stepped shape. The inner diameter D (see also the enlarged portion in FIG. 17) of the annular recess 81A is slightly smaller than the outer diameter D1 of the annular body 60A.

When assembling the annular resin product 6A to the assembly 8A, the annular resin product 6A is held in the state where the reinforcing member 7A is held by the robot hand m (see FIG. 14) similar to the above. Position on top of. Then, the annular body 60A is press-fitted into the inner diameter portion of the annular recess 81A. At the time of this press-fitting, the outer peripheral edge portion of the annular body 60A, and if necessary, the inner diameter portion of the annular recess 81A may be heated to fix the annular body 60A to the annular recess 81A by welding. Further, when the annular body 60A is press-fitted into the annular recess 81A, the outer peripheral edge of the annular body 60A may be caulked to be integrated with the annular recess 81A. Furthermore, as the welding process, a method using vibration, ultrasonic waves, a hot plate, a laser, or the like can be employed.

Thereafter, the broken portion 70A is cut to separate the reinforcing member 7A from the annular body 60A, whereby the assembly of the annular resin product 6A to the assembly 8A is completed. FIG. 17 shows a state where the reinforcing member 7A is separated from the annular body 60A and the assembly of the annular resin product 6A to the assembly 8A is completed. Until the annular body 60A is assembled to the assembled body 8A, the annular body 60A is provided with the reinforcing member 7A. Therefore, the annular body 60A can be assembled to the assembled body 8A while suppressing deformation of the annular body 60A. . Further, during the press-fitting operation of the annular body 60A into the annular recess 81A, a strong stress acts on the annular body 60A. However, since the reinforcing member 7A is integrated with the annular body 60A, the annular resin product 6A The press-fitting operation is performed with the deformation suppressed. Further, even when the welding process is involved as described above, the annular body 60A may be thermally deformed by the influence of heat, but such deformation is also suppressed by the reinforcing member 7A. Accordingly, the annular body 60A can be correctly assembled at a predetermined position of the assembly to be assembled 8A without complicating the assembling work of the annular body 60A.

18 is still another example of the cyclic resin product used in the method for assembling the cyclic resin product according to the present invention, and is a schematic plan view showing a modification of the example of FIG. In this example, the shape of the cyclic resin product obtained in the cyclic resin product molding step P1 (see FIG. 12) is different from the example of FIG. That is, the rectangular annular body 60 in this example does not have the tag 62 as shown in FIG. A through hole 63 into which the pin 81 (see FIG. 11) is press-fitted is provided at an appropriate position of the annular body 60. The reinforcing member 7 in this example is directly connected to the inner portion of the annular body 60. Also in this example, due to the presence of the reinforcing member 7, distortion deformation at the time of molding of the annular resin product 6 is suppressed, and deformation in the process of conveyance to the assembly and assembly is suppressed in the same manner as described above. .
The other configuration is the same as that of the example shown in FIG. 10, and therefore, the same reference numerals as those in FIG.

19 (a) and 19 (b) are schematic plan views showing still another example of the cyclic resin product used in the method for assembling the cyclic resin product according to the present invention. In this example, the shape of the cyclic resin product obtained in the molding step P1 of the cyclic resin product (see FIG. 12) and the shape of the reinforcing member are different from the example of FIG. That is, the rectangular

annular bodies

60B and 60C in this example do not have the tag 62 as shown in FIG. And in the cyclic resin product 6B of the example of (a) figure, the reinforcing member 7B is made into the H shape which consists of rod-shaped part 7Ba, 7Bb, 7Bc in planar view, (b) In the cyclic resin product 6C of the example of a figure, When viewed from above, the rod-shaped portions 7Ca and 7Cb are formed in an X shape, and the reinforcing

members

7B and 7C are connected to the opposing long sides of the

annular bodies

60B and 60C via the

fracture portions

70B and 70C. Has been. Such

annular resin products

6B and 6C were set so that the shape of the cavity in the molding apparatus 9 shown in FIG. 13 corresponds to the shape of the

annular resin products

6B and 6C shown in FIGS. Molded by the molding device 9. Also in this case, a resin injection sprue (not shown) is provided at a portion corresponding to the central portion of each of the reinforcing

members

7B and 7C, and the

annular bodies

60B and 60C and the reinforcing

members

7B and 7C are integrally formed, respectively. . Since these

annular resin products

6B and 6C are also reinforced by the

annular members

60B and 60C by the reinforcing

members

7B and 7C, the deformation at the time of demolding is suppressed as described above. Then, in the state where the reinforcing

members

7B and 7C are gripped by the robot hand m (see FIG. 14) in the same manner as described above, press fitting, caulking, heat caulking, and heat The reinforcing

members

7B and 7C are separated after assembly by welding or the like. Also in these examples, due to the presence of the reinforcing

members

7B and 7C, distortion deformation at the time of molding of the

cyclic resin products

6B and 6C is suppressed, and the deformation to the assembly and the assembling process is performed as described above. Is suppressed as well.

FIG. 20 shows a modification of the cyclic resin product used in the method for assembling the cyclic resin product according to the present invention. FIG. 20 (a) is a schematic plan view of the cyclic resin product, and FIG. FIG. 6 is a cross-sectional view corresponding to a section taken along line CC of FIG. (A) in a state where a plurality of cyclic resin products are stacked. The cyclic resin product 6D obtained in this example has a reinforcing member 7D provided with a protrusion 71D protruding in the axial direction of the annular body 60D from any part of the annular body 60D. To do. In the illustrated example, the protrusions 71D are formed in parallel and with the same dimensions so as to stand on the reinforcing member 7D at four locations in the vicinity of the neck portions 70D. The protrusion 71D has a flat tip surface. The protrusion 71D is simultaneously molded together with the annular body 60D and the reinforcing member 7D in the annular resin product molding step P1. Then, after the annular resin product molding step P1, as shown in FIG. 20B, the protrusions 71D support the reinforcing members 7D of the other annular resin products 6D. Align like so. In this way, a plurality of the cyclic resin products 6D are stacked, and in this state, they are carried into the assembly process P2 to be assembled or temporarily stored, and then each of the cyclic resin products 6D is assembled in the same manner as described above. Assembling is carried out.
In this carrying-in or storage process, the protrusions 71D... Have a spacer function, so that the annular bodies 60D do not interfere with each other, the annular body 60D is prevented from being damaged, and the annular resin product 6D is more deformed. Effectively suppressed. The assembly process P2 to the assembly is performed in the same manner as described above. However, after the assembly process P2 to the assembly, the reinforcing member 7D is separated together with the protrusions 71D by cutting. Thus, the annular body 60D is assembled to the assembly.

In FIG. 20, the plurality of annular resin products 6D are stacked such that the protrusion 71D supports the reinforcing member 7D of the other annular resin product 6D, but the protrusion 71D is located below the annular body 60D. A plurality of cyclic resin products 6D... May be arranged so as to be stacked and function as legs of the cyclic resin product 6D.
In FIG. 20, a plurality of cyclic resin products 6D are aligned so as to be stacked one above the other in a flat state. However, the circular resin products 6D are aligned so as to be stacked vertically and stacked horizontally. May be. In this way, when the plurality of cyclic resin products 6D are aligned and stored or transported, for example, it is convenient to prepare a dedicated tray and align the tray. Further, a plurality of annular resin products 6D... May be aligned in the lateral direction by hanging an annular body on a horizontally extending long pin.

The illustrated cyclic resin products 6 to 6D and the reinforcing members 7 to 7D are not limited to the illustrated ones, and are designed according to the shape of the assembly target of the resin annular bodies 60 to 60D as the final product. Needless to say, it is set appropriately. For example, it may be an annular resin product in which an elastic body such as rubber is formed on the outer periphery of the annular bodies 60 to 60D.
Further, for example, as the shape of the reinforcing member, a plate-like member arranged in a rectangular or circular annular body and connected to the inner part of the annular body via a plurality of linear parts (breaking parts) can also be adopted. is there.
Instead of supporting and transporting the reinforcing member of the annular resin product, the annular body may be supported and transported. For example, when the reinforcing member has a shape that is difficult to grasp by the robot hand, the annular member may be supported and conveyed. However, in this case, it is necessary to take measures for preventing damage to the annular body so that the function of the cyclic resin product can be maintained.
Furthermore, the positional relationship when the annular body 60 is assembled to the upper surface of the box 80 as shown in FIG. 10 is not particularly limited. For example, the annular resin product may be assembled to the box 80 so that the outer surface of the ring 60 does not align with the outer edge of the box 80. Alternatively, the annular resin product 6 may be assembled to the box body 80 so that the inner surface of the ring body 60 is aligned with the opening edge 80 a of the box body 80.

In addition, as examples of the method of assembling the cyclic resin product to the assembly, press-fitting, caulking, heat caulking, and welding are exemplified, but other than these, for example, external fitting, screwing, screwing, adhesion, etc. In addition, these can be used in combination as appropriate. The method for assembling the annular resin product of the present invention is applied to various industrial fields. For example, a head cover of an automobile engine is used as an assembly, and a resin head cover gasket as an annular body is assembled into the head cover. In this case, the oil pan is preferably used when the oil pan is assembled and a resin oil pan gasket as an annular body is assembled to the oil pan. Alternatively, it is preferably employed when various piping is used as an assembly and a resin joint member as an annular body is assembled to the piping. Further, the present invention is also used when a box that houses an electronic device such as an integrated circuit is used as an assembly and a resin gasket as an annular body is assembled to the box.

DESCRIPTION OF SYMBOLS 1 Molded body 2 Base | substrate 2a Partial annular part 2b Suspension part 2c Lack | missing part 3 Rubber-like elastic member 4 Reinforcement member 42 Protrusion part 5 Primary molded object S1 Primary molding process S2 Secondary molding process (molding process process)
S3 Secondary vulcanization process (heating process)
S4 Separation process 6 to 6D annular resin product 60 to 60D annular body 63 through hole 7 to 7D reinforcing member 71D protrusion 8, 8A assembly 81 pin 81A annular recess (recess)

Claims

In a method for producing a molded body provided with a base made of a resin material,
A primary molding step of integrally molding the base and a reinforcing member separable from the base;
A molding process step for performing a molding process on the primary molded body obtained by the primary molding process;
A separation step of separating the reinforcing member from the substrate after the molding treatment step.
In the manufacturing method of the molded object according to claim 1,
In the primary molding step, the base is molded into an annular shape,
The molding process is a secondary molding process in which the primary molded body is disposed in a mold and a rubber-like elastic member is molded on the base.
In the manufacturing method of the molded object according to claim 2,
The rubber-like elastic member is vulcanized rubber,
After the secondary molding step, the heating step of taking out the primary molded body from the mold and heating the rubber-like elastic member in a state where the reinforcing member and the base body are integrated. A method for producing a molded article.
In the method for producing a molded body according to any one of claims 1 to 3,
In the primary molding step, the reinforcing member is molded into a shape that spans the inside of the base body.
In the method for producing a molded body according to any one of claims 1 to 4,
In the primary molding step, the reinforcing member is formed with a protrusion that protrudes in the axial direction of the base rather than the base.
After the primary molding step, the plurality of primary molded bodies are aligned so that the protrusions are in contact with reinforcing members of other primary molded bodies, and then the secondary molding step is performed. Body manufacturing method.
In the manufacturing method of the molded object according to claim 1,
The base body includes a partial annular portion in which a part of the annular shape is lacked, and a suspension portion spanned inside the partial annular portion. In the primary molding step, the reinforcing member is used as the partial annular portion. A method for producing a molded body, wherein the molded body is molded integrally with the base so as to compensate for the lacking portion.
In the assembly method of the cyclic resin product in which the resin annular body is assembled to the assembly,
The annular member and the reinforcing member separable from the annular member are integrally formed,
Then, after assembling the annular body to the assembly, the reinforcing member is separated from the annular body.
In the assembly method of the cyclic resin product according to claim 7,
An assembly method of an annular resin product, wherein the annular body is assembled to the assembly by supporting the reinforcing member, arranging the annular body on the assembly, and performing caulking. .
In the assembly method of the cyclic resin product according to claim 8,
The annular body is provided with a plurality of through holes into which a plurality of pins provided in the assembled body can be press-fitted. The annular body supports the reinforcing member and is disposed in the assembled body. A method for assembling an annular resin product, wherein the pin is press-fitted and the pin is heat caulked to assemble the annular member to the assembly.
In the assembly method of the cyclic resin product according to claim 7,
An assembly of the annular resin product, wherein the annular body is assembled to the assembled body by supporting the reinforcing member and arranging the annular body on the assembled body and performing a welding process. Method.
In the assembly method of the cyclic resin product according to claim 7,
The annular body is arranged in the recess formed in the assembly by supporting the reinforcing member, and the annular body is assembled in the assembly by press-fitting into the recess. Assembling method of cyclic resin product.
The assembly method of the cyclic resin product according to any one of claims 7 to 11,
The reinforcing member is formed with a protrusion protruding in the axial direction of the annular body from the axial end surface of the annular body,
After the annular body and the reinforcing member are integrally molded, the plurality of annular bodies are aligned so that the protrusions abut against the reinforcing members of the other annular bodies, and then the annular body is attached to the assembled body. A method for assembling a cyclic resin product, wherein the assembling is performed.
In the annular resin product provided with the resin-made annular body to be assembled to the assembly,
A separable reinforcing member is integrally formed on the annular body, and the reinforcing member is separated from the annular body in a state where the annular body is assembled to the assembled body. A characteristic cyclic resin product.