JP2014185749A - Manufacturing method of molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a molding which inhibits deformation of a base material, such as distortion, at least until molding process is performed in the case where the molding process is performed to the resin base material to form a molding.SOLUTION: A manufacturing method of a molding 1 including a base material 2 made of a resin material includes: a primary molding step S1 where the base material 2 and a reinforcement member 4 which is separable from the base material 2 are integrally molded; a molding process step S2 where molding process is performed to a primary molding 5 obtained in the primary molding step S1; and a separation step S4 where the reinforcement member 4 is separated from the base material 2 after the molding process step S2.

Description

  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.

  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.

JP 2008-232308 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.

  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.

  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.

  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.

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 partially broken longitudinal sectional view of a molding apparatus corresponding to a BB line arrow portion of FIG. 4 (a), showing a molding procedure by the molding apparatus in the primary molding step shown in FIG. 3. FIG. 4 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.

  Embodiments of the present invention will be described below 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 the manufacturing method of the said molded object 1 is demonstrated 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 by 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 20 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 body 2 is accommodated in the base body 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 body 2. At this time, the base body 2 is also 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 form 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. 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 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.

  FIGS. 9A and 9B are schematic plan views showing still another form 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 lacking 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 lacking 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.

  Moreover, the site | part of the base | substrate 2 which shape | molds the rubber-like elastic member 3 integrally is not specifically 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.

  The secondary molding step S2 in the above embodiment is a step of vulcanizing and molding an unvulcanized rubber material, but 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.

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 Projection 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

Claims (6)

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 placed in a mold and a rubber-like elastic member is molded on the substrate. 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 manufacturing method of the molded object as described in any one of Claims 1-3,
In the primary molding step, the reinforcing member is molded into a shape that spans the inside of the base body. In the manufacturing method of the molded object as described in any one of Claims 1-4,
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.

Images