JP6253191B2 - Manufacturing method of molding dies and composite products - Google Patents

Description

The present invention, the molding die, about the composite articles produced how.

Conventionally, for example, a composite product in which an elastic material such as rubber is integrally formed on a metal member is known.
Patent Document 1 below discloses a manufacturing method for manufacturing a composite product.
As described in Patent Document 1 below, if the metal member is not press-molded with high accuracy, there is a gap between the metal member and the molding die when the metal member is placed in the molding die. There are things you can do. In this state, when rubber is placed in the molding die and pressed and supplied to the cavity, the rubber material leaks from the gap and an unexpected burr is formed.

Therefore, in the manufacturing method described in Patent Document 1 below, a concave step portion is formed in the bent portion of the metal member, and by fitting the concave step portion and the press contact portion of the molding die, rubber leakage is prevented. Yes.

JP-A-62-68711

  However, in the case of the configuration described in Patent Document 1, unless the concave step portion of the metal member and the press contact portion of the molding die are formed with high accuracy, the rubber does not fit into the rubber when it is supplied into the cavity. Because of the high pressure, it is considered difficult to prevent unexpected rubber leakage.

In addition, when a tightening margin is set between the concave step portion of the metal member and the press contact portion of the molding die in order to counter the pressure on the rubber, the molding die is caused by a variation in the dimensions of the metal member. There was a problem in that wear progressed and the frequency of mold replacement and correction increased.
In particular, when stainless steel such as SUS304 is used as the metal member, since the dimensional variation of the metal member after press working or the like is large, the wear of the mold becomes a more serious problem.

The present invention has been made in view of the above circumstances, a novel mold which can correspond to variation in the size of the metal member, it is an object to provide a manufacturing how the composite article.

The molding die according to the present invention includes a metal member having a cylindrical portion and an extending portion extending radially inward from the cylindrical portion, and an elastic body made of an elastic material fixed to the outer surface of the metal member. In the molding die for integrally molding the composite article, the second die is provided with a first die and a second die that are relatively detachably provided and define a cavity for molding the elastic material. The mold includes a fixed mold that holds the extending portion from the inner surface side, and a movable mold having a pressure contact portion that presses against the inner surface during molding, and the movable mold is divided into a plurality of portions in the radial direction. It is characterized in that it is configured to be movable in the diameter expansion direction during molding.
According to the above configuration, when the metal member is disposed in the second mold, if the inner diameter of the metal member is larger than the outer diameter of the movable mold, the inner surface side of the cylindrical portion and the movable mold of the second mold A gap can be secured between the two. Therefore, even if the dimensions of the metal member vary, the friction between the cylindrical portion of the metal member and the second mold is reduced, so that wear of the second mold can be reduced. This also makes it possible to lengthen the replacement cycle of the second mold. Furthermore, at the time of molding, the movable mold moves in the diameter increasing direction toward the inner surface side of the cylindrical portion, and the press contact portion of the movable mold presses against the inner surface of the cylindrical portion. That is, since the radial dimension of the movable mold can be changed following the dimension of the metal member, the pressure contact state between the movable mold and the metal member can be made appropriate.

In the present invention, the movable mold is formed with a recess, and the second mold is fitted in the recess so as to allow movement of the movable mold in the radial direction. The first die is a middle piece in pressure contact with the outer surface of the extension portion at the time of molding, and at least one of the middle piece and the middle die. An upper mold that presses the elastic material placed on the cavity to the cavity, and the middle mold has a middle mold pressure contact portion that is in pressure contact with the outer surface of the cylindrical portion during molding, and the movable mold The mold may have a pressure direction conversion section that converts a pressing force from the upper mold into a force that moves in the diameter expansion direction via the middle mold during molding.
According to the above configuration, when the elastic material is pressed by the upper mold, the pressing force against the elastic material acts on the pressure direction conversion unit and is converted into a force that moves the movable mold in the diameter increasing direction. Therefore, when the movable mold moves in the diameter increasing direction, the press contact portion presses the inner surface of the cylindrical portion, and the middle mold press contact portion presses the outer surface of the cylindrical portion, and the metal member is tightened by these. Therefore, even if the first mold and the second mold are not completely tightened or the metal member is displaced, the pressure contact portion and the middle mold pressure contact portion are elastically pressed against the tube portion. The material can be prevented from leaking from the cavity.
Further, according to the above configuration, the pressing force applied to the elastic material is converted into a force for moving the movable mold in the diameter expanding direction, and the pressing force applied to the elastic material and the cylindrical portion of the press contact portion and the intermediate press contact portion. The pressure against is balanced. Therefore, it is possible to suppress leakage of the elastic material from the cavity and reduce the defect rate such as peeling of the elastic body after molding.

In the present invention, the movable mold may be equally divided in the radial direction at a pitch of 90 ° or less.
According to the above configuration, if the movable mold is equally divided at a pitch of 90 ° or less, the movable mold can be smoothly followed in accordance with variations in the dimensions of the metal member during molding. . Further, when the movable mold moves, the press contact portion presses the inner surface of the cylindrical portion with a uniform pressure in the radial direction, while the intermediate mold press contact portion presses the outer surface of the cylindrical portion with a uniform pressure in the radial direction. be able to.

In the present invention, an urging member for urging the movable mold in a diameter reducing direction may be provided on the outer peripheral side of the movable mold.
According to the above configuration, the movable mold that has moved in the diameter-expanding direction during molding by the urging member can be automatically returned to the original position after molding.

The method for manufacturing a composite product according to the present invention includes a cylindrical part in a molding die composed of a first mold and a second mold that are relatively separable, and an extending part that extends radially inward from the cylindrical part. In a manufacturing method of a composite product, in which a metal member provided with an elastic body is integrally formed on an outer surface of the metal member by supplying an elastic material to a cavity formed in the molding die. Either one has a fixed mold that holds the extension part from the inner surface side, and a pressure contact part that presses against the inner surface of the cylindrical part at the time of molding, and is divided into a plurality of parts in the radial direction. A movable mold configured to be movable, and the metal member is disposed on the fixed mold in a state where a gap is secured between the press-contact portion of the movable mold and the cylindrical portion of the metal member. And the elastic material by relatively approaching the first mold and the second mold. A supply step of supplying to said cavity, and wherein the movable mold has a moving step of moving the diameter direction.
According to the above manufacturing method, when arrange | positioning a metal member in a 2nd metal mold | die, a clearance gap can be ensured between the inner surface side of a cylinder part, and the movable metal mold | die of a 2nd metal mold | die. Therefore, even if there is a variation in the dimensions of the metal member, it can be easily installed in the mold.

In the present invention, in the moving step, the pressing force in the supplying step for pressing and supplying the elastic material to the cavity is transmitted to the movable mold, and the movable mold is moved in the diameter expansion direction. May be.
According to the above manufacturing method, the pressing force applied to the elastic material becomes a force that moves the movable mold in the diameter expanding direction, and the pressing force applied to the elastic material and the force that moves the movable mold in the diameter expanding direction Can be balanced.

In the present invention, the metal member may be made of stainless steel.
According to the above manufacturing method, even when using stainless steel, which is considered to have a large variation in the dimensions of the metal member after press working or the like, it can be easily installed on the mold, The occurrence of problems can be prevented.

  According to the present invention, it is possible to cope with variations in dimensions of metal members.

It is a schematic longitudinal cross-sectional view which shows typically an example of the shaping die based on one Embodiment (1st Embodiment) of this invention. FIG. 2 is a schematic cross-sectional view (cross-sectional view taken along the line XX in FIG. 1) schematically showing an example of a movable mold of the molding die in the same embodiment. It is the Y section enlarged view of Drawing 1, and is a rough longitudinal section showing typically the middle of fabrication. FIG. 4 is an enlarged view of a Z part in FIG. 3, and is a schematic longitudinal sectional view schematically showing the middle of molding. FIG. 4 is a diagram corresponding to an enlarged view of a Z part in FIG. 3, and is a schematic longitudinal sectional view schematically showing during clamping. It is a figure which shows typically an example of the composite goods manufactured by the manufacturing method using the shaping die in the embodiment, and is a partially broken perspective view of the composite goods. It is a schematic longitudinal cross-sectional view which shows typically an example of the molding die concerning other embodiment (2nd Embodiment) of this invention. It is a figure which shows the example of application of a composite article, and shows the longitudinal cross-sectional view and enlarged view of the principal part of the bearing apparatus which mounted the composite article as a bearing apparatus cap and a bearing seal.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In some of the drawings, some of the detailed reference numerals attached to other drawings are omitted. 1 and 3, L indicates the center line of the molding die 100, and in FIG. 8, L1 indicates the axis of the bearing device 90. In FIG. 2, the fixed die 20 and the bolt 24 are not shown. It shows.

<First Embodiment>
With reference to FIGS. 1 to 6, a molding die, a method for manufacturing a composite product, and a composite product manufactured by the manufacturing method according to the first embodiment will be described.
The molding die 100 in the present embodiment is a die for integrally molding an elastic material 50 on a bottomed cylindrical metal member 4 having a cylindrical portion 41 and an extending portion 40 extending radially inward from the cylindrical portion 41. .
The molding die 100 is provided with a first die 1 and a second die 2 which are provided so as to be relatively close to each other and which define a cavity 7 (see FIGS. 4 and 5) for molding the elastic material 50. ing.
The second mold 2 includes a movable mold 21 having a fixed mold 20 that holds the extended portion 40 of the metal member 4 from the inner surface 40b side, and a press-contact portion 21a that is pressed against the inner surface 41b during molding (FIG. 4, FIG. (See FIG. 5). The movable mold 21 is divided into a plurality of parts in the radial direction, and is configured to be movable in the diameter increasing direction during molding.
This will be described in detail below.

The molding die 100 is not particularly limited as long as the first die 1 and the second die 2 are relatively movable as shown in FIG. Both of the second molds 2 may move, or only one of them may move. The illustrated example shows an example in which the first mold 1 is moved up and down relative to the second mold 2 so as to be relatively close to and away from.
The first mold 1 includes an upper mold 11 connected to a movable side mounting plate (not shown) by a bolt or the like, and a middle piece 10 connected to the upper mold 11 by a bolt or the like. That is, the middle piece 10 and the upper mold 11 are connected by a coupling tool such as a bolt (not shown), and this coupling tool is loosely inserted into the upper mold 11 so that the middle piece 10 and the upper mold 11 are The first mold 1 is configured to move up and down together.

The middle piece 10 is provided at a position directly above the fixed mold 20 constituting the second mold 2 and is formed on the outer surface 40a of the extending portion 40 of the metal member 4 set on the fixed mold 20 at the time of molding. A part is provided so as to be pressed from above. The lower surface of the middle piece 10 is a flat surface, and becomes a pressing surface 10 a that presses the outer surface 40 a of the extending portion 40 of the metal member 4 at the time of molding facing the fixed mold 20.
As shown in FIG. 3, the metal member 4 is positioned in the vertical direction by the extended portion 40 of the metal member 4 being sandwiched between the pressing surface 10 a of the middle piece 10 and the fixed mold 20. The
The shape of the middle piece 10 is not limited to the illustrated example, and only a portion facing the outer surface 40a of the extending portion 40 of the metal member 4 may be a flat surface protruding from the other portions.
An outer peripheral step portion 10c (see FIGS. 1 and 3) is formed below the outer peripheral side of the middle piece 10 so as to protrude to the middle mold 22 side, which will be described later, and to define a reservoir 51 of the elastic material 50. In the figure, 10b indicates the outer peripheral side surface of the middle frame 10, and 10d indicates the lower outer peripheral side surface of the outer peripheral step portion 10c.

The upper die 11 presses the elastic material 50 placed on the middle piece 10 and at least one of the middle piece 10 and the middle die 22 to the cavity 7. The figure shows an example in which the elastic material 50 placed on the annular and notched step 22 c of the middle mold 22 is pressed against the cavity 7.
The upper die 11 is provided so as to surround the upper portion of the middle piece 10 and the outer peripheral side surface 10b of the middle piece 10, and is an annular upper die pressing portion 11a that protrudes downward to press the elastic material 50. (See FIGS. 1 and 3). In the drawing, 11b indicates the lower end surface of the upper mold pressing portion 11a.

Next, the second mold 2 includes a middle mold 22 and a lower mold 23 in the illustrated example, in addition to the fixed mold 20 and the movable mold 21. At the center of the second mold 2, a bolt 24 that connects the fixed mold 20 and the lower mold 23 in a fixed state is provided.
The fixed mold 20 is provided opposite to the middle piece 10, and an upper surface 20 a is formed in accordance with the shape of the extending portion 40 so that the extending portion 40 of the metal member 4 is placed. Is held from the inner surface 40b side. On the outer peripheral side of the fixed mold 20, a corner portion 20 b (see FIGS. 4 and 5) located on the inner surface 42 b side of the corner portion 42 of the metal member 4 is formed. Therefore, the outer diameter of the fixed mold 20 is formed to substantially coincide with the inner diameter of the metal member 4.

  The movable mold 21 has a circular shape in plan view so that the bottomed cylindrical metal member 4 can be arranged as shown in FIG. 2, and is divided into a plurality (six in this embodiment) in the radial direction. Yes. The movable mold 21 in the figure shows an example in which the movable mold 21 is radially divided at a pitch of about 60 °, and 210 in the figure shows a divided block type.

The configuration of the movable mold 21 is not limited to this, and any structure may be used as long as the movable mold 21 is equally divided in the radial direction at a pitch of 90 ° or less. That is, for example, as the number of divided block molds 210 is divided into four or more, each divided block mold 210 becomes smaller, so that each divided block mold 210 smoothly follows according to variations in the dimensions of the metal member 4. It becomes easy to do. Further, when each of the divided block molds 210 constituting the movable mold 21 is moved, each of the divided block molds 210 has a diameter contacting the inner surface 41b of the cylindrical portion 41 according to the dimensional variation of the metal member 4. In the same manner, the middle mold pressure contact portion 22a can press the outer surface 41a of the cylindrical portion 41 with equal pressure in the radial direction.
In addition, since it is not possible to respond to variations in the dimensions of the metal member 4 if it is 3 divisions or less, and the size of each divided block mold 210 is larger than the case where it is divided at a pitch of 90 ° or less, It becomes difficult to move following the metal member 4.

As shown in FIG. 1, FIG. 2, FIG. 3 and the like, a recess 21b having an upper opening is formed in an annular shape on the upper surface of the movable mold 21, and in the drawing, 21ba is an inner side surface of the recess 21b ( Hereinafter, the first side surface), 21bb indicates the bottom surface of the recess 21b, and 21bc indicates the outer side surface (hereinafter referred to as the second side surface) of the recess 21b.
The first side surface 21ba of the recess 21b is formed in accordance with the shape of the cylindrical portion 41 of the metal member 4. Specifically, the first side surface 21ba of the recess 21b is formed so that the diameter thereof is smaller than the inner diameter of the cylindrical portion 41 (see FIG. 4), and when the metal member 4 is disposed, A gap D is secured between the inner surface 41b of the cylindrical portion 41. Above the first side surface 21ba, a pressure contact portion 21a (see FIGS. 4 and 5) that protrudes so as to be pressure contacted with the inner surface 41b of the cylindrical portion 41 is formed.

On the other hand, the second side surface 21bc of the recess 21b is an inclined surface that descends inward toward the bottom surface 21bb, and this second side surface 21bc applies the pressing force from the upper mold 11 to the middle mold 22 during molding. It becomes a pressure direction conversion part which converts into the force which moves to a diameter expansion direction via.
Here, the configuration of the second side surface 21bc is not limited to the configuration having an inclined surface (tapered shape) as shown in the figure, and a configuration capable of converting a substantially vertical force into a substantially horizontal force. If it is.

As shown in FIG. 1 and the like, an urging member 6 that urges the movable mold 21 in the diameter reducing direction may be provided on the outer peripheral side of the movable mold 21. In the illustrated example, a recess 21ca (see FIG. 3) in which a biasing member 6 that biases the movable mold 21 in the diameter reducing direction is formed on the outer peripheral side surface 21c of the movable mold 21. The recess 21ca is formed over the entire circumference of the outer peripheral side surface 21c of the movable mold 21, that is, the divided block mold 210. As the urging member 6, a spring member such as a compression spring can be used.
According to this, the force which is going to return to the original position can be made to act on the movable mold 21 which moves in the diameter expansion direction at the time of molding by the urging member 6. Further, when the mold is opened, the movable mold 21 can be returned to the original position by the urging force that is released from the pressure from the elastic material 50 and urges the urging member 6 in the diameter reducing direction.

  The lower die 23 is provided at the bottom of the molding die 100, and a plurality of bolt holes (not shown) are provided at appropriate intervals in the circumferential direction outside the lower surface of the lower die 23. On the lower mold 23, the fixed mold 20 is placed, and the movable mold 21 is placed so as to surround the fixed mold 20. The lower mold 23 and the fixed mold 20 are connected by bolts 24. The lower mold 23 and the movable mold 21 are connected by a stripper bolt (not shown) so as to allow the radial movement of the divided block mold 210.

The middle mold 22 is fitted into a recess 21b formed in the movable mold 21 so as to allow the movable mold 21 to move in the radial direction. Therefore, the lower surface of the middle mold 22 is provided with a fitting portion 22b formed in accordance with the shape of the first side surface 21ba, the bottom surface 21bb, and the second side surface 21bc of the recess 21b. More specifically, the fitting portion 22b includes an inner side surface 22ba, a lower end surface 22bb, and an outer side surface 22bc that are formed so as to match the shapes of the first side surface 21ba, the bottom surface 21bb, and the second side surface 21bc. The outer surface 22bc of the fitting portion 22b is an inclined surface that descends inward so as to be in sliding contact with the second side surface 21bc of the movable mold 21. As shown in FIGS. 4 and 5, the inner surface 22ba of the fitting portion 22b is provided with a middle mold press contact portion 22a that presses the outer surface 41a of the tube portion 41 during molding. A cavity forming portion 22e that divides the cavity 7 is formed on the inner side surface 22ba of the same fitting portion 22b, and is shaped like a desired shape when the elastic material 50 is solidified as the elastic body 5. The cavity forming portion 22e shown here is formed in a concave shape.
Here, the cavity 7 filled with the elastic material 50 is partitioned by a cavity forming portion 22e, an outer end surface of the pressing surface 10a of the middle piece 10, and an outer surface 42a of the corner portion 42 of the metal member 4 as shown in FIG. The When the elastic material 50 is injected into the cavity 7 as shown in FIG. 5, the inner mold pressure contact portion 22 a strongly presses the outer surface 41 a of the cylindrical portion 41 of the metal member 4. 7 can be prevented from leaking to the outer cylindrical portion 41 side.

A step 22c is formed at the upper inner corner of the middle mold 22, and the elastic material 50 is placed on the corner formed by the step 22c and the side 22d.
As shown in FIG. 3, the reservoir portion 51 of the elastic material 50 includes a lower end surface 11b of the upper mold pressing portion 11a of the upper mold 11, an outer peripheral side surface 10b of the middle piece 10, an outer peripheral step portion 10c, and a step portion 22c. And the side surface portion 22d. Further, the injection path 70 is a gap between the lower outer peripheral side surface 10d of the middle piece 10 formed at the time of mold clamping and the inner side surface 22ba of the middle mold 22 as shown in FIG.

Next, an example of a manufacturing method of the composite product 9A manufactured by the molding die 100 of the first embodiment described above will be described.
<Set process>
First, with the middle mold 22 removed from the recess 21b, the bottomed cylindrical metal member 4 processed into a desired shape by pressing or the like is used as the second mold 2, specifically, a fixed mold. 20 above. At this time, the movable mold 21 is set at a position in the centripetal direction by the action of the urging member 6, and there is no gap between the divided block molds 210 and the fixed mold 20.
Therefore, as shown in FIG. 4, when the metal member 4 is disposed in the second mold 2, a gap D is secured between the inner surface 41 b side of the cylindrical portion 41 and the first side surface 21 ba of the movable mold 21. Has been.
Thereby, even if the dimension of the metal member 4 varies, the variation is absorbed by the gap D, and the friction between the cylindrical portion 41 of the metal member 4 and the second mold 2 is reduced. Wear can be reduced. Moreover, the replacement period of the 2nd metal mold | die 2 can be lengthened by this. In particular, even when the metal member 4 is made of stainless steel, which is considered to have a large dimensional variation after press working or the like, it can be easily installed in the second mold 2 as described above. Occurrence of a serious manufacturing problem can be prevented.

<Clamping and supply process>
Next, the middle mold 22 is fitted into the recess 21b, the second mold 2 is heated, and an elastic material 50 such as an unvulcanized rubber material is formed at the corner formed by the step portion 22c and the side surface portion 22d. Is placed (see FIG. 1). Then, the heated first mold 1 is lowered, the mold is clamped, and the elastic material 50 is supplied to the cavity 7.
Specifically, first, the pressing surface 10 a of the middle piece 10 of the first mold 1 is lowered to a position where it presses the outer surface 40 a of the extending portion 40 of the metal member 4. And since the pressing surface 10a presses strongly the outer surface 40a of the extension part 40 of the metal member 4, the extension part 40 of the metal member 4 is sandwiched between the middle piece 10 and the fixed mold 20, and the metal The member 4 is positioned in the vertical direction. Thereafter, the upper mold 11 is lowered to a position where it can press the elastic material 50 and can be injected into the cavity 7, and the elastic material 50 is crushed in the pool portion 51 by the upper mold pressing portion 11 a of the upper mold 11. From there, the elastic material 50 which has lost its place is injected into the cavity 7 through the injection path 70 (see FIGS. 3 and 4).

<Transfer process>
Here, when the elastic material 50 is pressed by the upper mold 11, a strong molding pressure against the elastic material 50 acts on the second side surface 21bc, and the movable mold 21 is expanded in the diameter direction (the direction of the arrow d1 in FIGS. 3 and 4). Converted into force to move to (see). Specifically, the middle mold 22 receives a strong clamping force applied to the elastic material 50 from above. Then, the pressure applied in the substantially vertical direction is transmitted from the outer side surface 22bc of the inclined middle mold 22 to the second side surface (pressure direction converting portion) 21bc of the movable mold 21 and acts in the substantially horizontal direction. Converted into force (cam action). Thereby, the movable mold 21 moves in the diameter increasing direction toward the inner surface 41b of the cylindrical portion 41, and the gap D between the inner surface 41b side of the cylindrical portion 41 and the first side surface 21ba of the movable mold 21 is reduced. Go. Then, the pressure contact portion 21a of the movable mold 21 is in pressure contact with the inner surface 41b of the cylinder portion 41, and the middle mold pressure contact portion 22a of the middle mold 22 is pressure contacted with the outer surface 41a of the cylinder portion 41, so that both surfaces of the metal member 4 (the outer surface 41a and the inner surface) 41b) is tightened by these.

Normally, the pressing force (clamping pressure) applied to the elastic material 50 is a force for the elastic material 50 to leak out of the cavity 7 after the elastic material 50 is filled in the cavity 7. For example, since the force is converted into a force that moves the movable mold 21 in the diameter increasing direction, the pressing force applied to the elastic material 50 and the pressure on the cylinder portion 41 of the press contact portion 21a and the intermediate mold press contact portion 22a Are balanced. Therefore, the press-contact state between the press-contact part 21a and the metal member 4 can be made appropriate, and an excessive force applied to the metal member 4 can be reduced.
According to the above, by the time the elastic material 50 is supplied to the cavity 7, the radial dimension of the movable mold 21 changes so as to match the dimension of the metal member 4, so that variations in the dimension of the metal member 4 can be absorbed. . Further, even if the first mold 1 and the second mold 2 are not completely tightened or the metal member 4 is installed slightly deviated, the press contact portion 21a and the middle mold press contact portion 22a are formed in the cylindrical portion. 41 is pressed from both sides, so that the elastic material 50 that is in a fluidized state by heating spreads to every corner of the cavity 7 by pressurization, and it is possible to prevent unexpected burrs from leaking from the cavity 7 and molding. It is possible to reduce the defect rate such as the subsequent peeling of the elastic body 5.

<Pressurization and vulcanization process>
After performing the mold clamping in this way, vulcanization is performed for a predetermined time.
<Opening process, demolding process>
When the elastic material 50 is cured to become the elastic body 5, the first mold 1 is raised and the mold is opened. Then, the pressure from the elastic material 50 is released, the urging member 6 acts in the direction of diameter reduction, the movable mold 21 returns to the original position, and the inner surface 41b side of the cylindrical portion 41 and the movable mold 21 again. A gap D is formed between the first side surface 21ba and the first side surface 21ba (the state shown in FIG. 4).
Then, if the middle mold 22 is removed from the recess 21b, the metal member 4 is taken out from the movable mold 21, and the burr 50a is removed, the composite having the protruding portion elastic body 5 at the corner 42 as shown in FIG. Product 9A can be obtained.
Here, when the composite product 9A is removed from the mold, the gap D is formed, so that it can be easily removed. Further, since the friction and wear between the metal member 4 and the second mold 2 can be prevented by the gap D described above, the replacement cycle of the second mold 2 is long and the correction frequency can be reduced.
Moreover, according to the above manufacturing method, as described in the above-mentioned <Movement step>, the mold clamping pressure becomes the injection input of the elastic material 50 into the cavity 7 and is converted into the movement pressure of the movable mold 21. The method is suitable for so-called multiple manufacturing in which a plurality of composite products 9A are manufactured at a collective pressure using a plurality of molding dies 100.

Second Embodiment
Next, with reference to FIG. 7, a molding die, a method for manufacturing a composite product, and a composite product manufactured by the manufacturing method according to the second embodiment will be described.
Note that differences from the first embodiment will be mainly described, and the same components will be denoted by the same reference numerals, and description thereof will be omitted or briefly described.
This embodiment is different from the first embodiment in that the metal member 4 is not bottomed and that the resulting composite product 9B has a plurality of lip portions 5a and 5b (see FIG. 8). Depending on the difference in shape, the molding die 100 has the following configuration.

The molding die 100 shown in FIG. 7 is an enlarged view of a part of the molding die 100 that has been clamped, and the elastic material 50 before direct pressure molding is indicated by a dotted line. The molding die 100 is a die for integrally molding an elastic material 50 on a metal member 4 having a cylindrical portion 41 and an extending portion 40 extending radially inward from the cylindrical portion 41, and a composite product 9B manufactured thereby. Can be a seal ring mounted on the outer side of the bearing device 90 shown in FIG.
The 1st metal mold | die 1 and the 2nd metal mold | die 2 are provided so that contact / separation is relatively possible, and the point which divides the cavity 7 for shape | molding the elastic material 50 is common. The first embodiment differs from the first embodiment in that the first mold 1 is not composed of the middle piece 10 and the upper mold 11 and that the lip forming portion 1b is provided. The basic configuration of the second mold 2 is the same as that of the first embodiment, and the fixed mold 20 that holds the extended portion 40 of the metal member 4 from the inner surface 40b side, and the press contact that presses the inner surface 41b during molding. A movable mold 21 having a portion 21a, and a middle mold 22 fitted in a recess 21b formed in the movable mold 21 so as to allow the movable mold 21 to move in the radial direction; And a lower mold 23 on which the fixed mold 20 is placed. In addition, the movable mold 21 in the present embodiment is also divided into a plurality of parts in the radial direction, and is configured to be movable in the diameter increasing direction during molding.

The first mold 1 includes a first facing surface 1 a provided opposite to the fixed mold 20, two lip portions 5 a, a corner portion 42 of the metal member 4, and an outer surface 40 a of the extending portion 40. A lip forming portion 1b that divides the cavity 7 so as to cover it, a second facing surface 1c that is provided opposite to the middle mold 22, and a burr groove of the elastic material 50 that leaks from the cavity 7 during direct pressure molding. A concave step 1d is provided.
The fixed mold 20 includes a flat surface 20c that contacts the first opposing surface 1a during molding and receives a pressing force, a concave step portion 20d that serves as a burr groove of the elastic material 50 that leaks from the cavity 7 during direct pressure molding, The mounting part 20e formed according to the shape by the side of the inner surface 40b of the extension part 40 of the metal member 4 is provided.
On the outer peripheral side of the fixed mold 20, a corner 20 b located on the inner surface 42 b side of the corner 42 of the metal member 4 is formed, and the outer diameter of the fixed mold 20 substantially matches the inner diameter of the metal member 4. It is formed as follows. Further, the fixed mold 20 is provided with a lip forming portion 20f having a shape for partitioning a part of the cavity 7 for forming the lip portion 5b.

  The structure and configuration of the middle mold 22 of the second mold 2 are the same as those of the first embodiment as described above. However, a cavity is formed in the upper upper corner of the middle mold 22 during direct pressure molding. A concave step portion 22g is formed as a burr groove of the elastic material 50 leaking out from 7.

The composite product 9B can be manufactured by the molding die 100 of the second embodiment described above, and the manufacturing method is the same as that of the first embodiment except that the method for supplying the elastic material 50 to the cavity 7 is different. be able to.
Specifically, after performing the process described in the above <setting process>, the elastic material 50 is placed on the outer surface 40a of the extending portion 40 of the metal member 4 as shown by the dotted line in FIG. Then, the first mold 1 is lowered to a position in contact with the second mold 2. At this time, the elastic material 50 receives a pressing force from the first mold 1 and is filled while being crushed into the cavity 7 which is a gap between the first mold 1 and the second mold 2. The elastic material 50 that has lost its place of flow flows to the concave steps 1d, 20d, and 22f, but when the elastic material 50 is pressed by the first mold 1, the strong molding pressure on the elastic material 50 is the second side surface. It is converted to a force that acts on 21bc and moves the movable mold 21 in the diameter-expanding direction, and the pressure contact state between the pressure contact portion 21a and the metal member 4 can be made appropriate, and an excessive force is applied to the metal member 4. Can be reduced.
According to the above, by the time the elastic material 50 is supplied to the cavity 7, the radial dimension of the movable mold 21 changes so as to match the dimension of the metal member 4, so that variations in the dimension of the metal member 4 can be absorbed. . Further, even if the first mold 1 and the second mold 2 are not completely tightened or the metal member 4 is installed slightly deviated, the press contact portion 21a and the middle mold press contact portion 22a are formed in the cylindrical portion. 41 is pressed from both sides, so that the elastic material 50 that is in a fluidized state by heating can be spread to every corner of the cavity 7 by pressurization, and unexpected burrs can be prevented from being formed. It is possible to reduce the defect rate such as peeling.
The subsequent <pressure / vulcanization step> and <mold opening step, demolding step> can be the same steps as in the first embodiment.

Next, an application example of the composite products 9A and 9B manufactured by the above manufacturing method will be described with reference to FIG.
The composite product 9A can be used as a metal cap that is mounted on a mechanical part or the like having an opening to close the opening, and may be a cap for a bearing device as shown in FIG.
The composite product 9 </ b> A shown here is attached to a bearing device 90, and here, as the bearing device 90, a hub bearing that rotatably supports a driven wheel of an automobile is shown.
The composite product 9B can be used as a sealing device mounted on a bearing device or the like. Here, the hub 9 is interposed between the outer member 3 and the inner member 30 at the outer end of the bearing space S. The bearing seal mounted so as to be slidable is shown.
The bearing device 90 is configured such that the hub ring 31 and the inner ring 32 are connected to an inner axis L1 via two rows of rolling elements (balls) 60 at an inner diameter portion of an outer member (outer ring member) 3 fixed to a vehicle body (not shown). The structure is supported so that it can rotate freely. The hub wheel 31 has a hub flange 33, and a tire wheel (not shown), which is a driven wheel, is attached to the hub flange 33 with bolts 33a. The hub ring 31 and the inner ring 32 constitute an inner member 30, and the rolling elements 60 are interposed between the outer member 3 and the inner member 30 while being held by a retainer 60 a. Further, a bearing space S serving as a space portion is formed between the outer member 3 including the interposed portions of the rolling elements 60 and the inner member 30.

A composite product 9A is fitted to the opening 3a in the axial direction of the outer member 3 by fitting, and is formed on the inner peripheral surface 3b of the opening 3a having a substantially circular shape when viewed from the inner end of the outer member 3. Mated. The composite product 9A blocks the axial opening 3a of the outer member 3, and the elastic body 5 elastically contacts the inner peripheral surface 3b (see the enlarged view of FIG. 8) of the outer member 3 to form a sealing member. As such, it functions to prevent intrusion of muddy water, dust and the like from the outside into the bearing space S.
In FIG. 8, reference numeral 81 denotes an annular magnet in which a large number of N poles and S poles are alternately magnetized, 82 denotes a support ring that supports the annular magnet, and 83 denotes detection that detects a magnetic change accompanying the rotation of the magnet 81. Means. Therefore, since the extending part 40 of the metal member 4 of the composite product 9 is mounted so as to be sandwiched between the magnet 81 and the detection means 83, in this example, the metal member 4 has a magnetic flux generated by the magnet 81. It is formed from a non-magnetic material so that it can penetrate.

The inner member 30 has a radial surface 34 that is flat along the direction of the axis L1 and an axial surface 35 that is formed radially outward with respect to the direction of the axis L1.
The composite product 9 </ b> B includes a metal member 4 serving as a core metal fitted to the outer member 3, and an elastic body 5 fixed to the metal member 4, and the cylindrical portion 41 of the metal member 4 has an inner periphery of the outer member 3. It is fitted to the surface 3b. The elastic body 5 has two lip portions 5 a and 5 a that are in sliding contact with the axial surface 35 of the inner member 30, and a lip portion 5 b that is in sliding contact with the radial surface 34.
The composite product 9B seals the outer side of the bearing space S, and functions to prevent entry of muddy water, dust, and the like from the outside into the bearing space S.

  As described above, the molding die 100, the first die 1, the second die 2, the middle die 22, the upper die 11, the middle piece 10, the fixed die 20, the movable die 21, the lower die 23, etc. The shape and configuration are not limited to the illustrated examples. For example, if the injection path 70 is formed between the middle mold 22 and the middle piece 10, these may be provided integrally. Further, the means for urging the movable mold 21 in the diameter-expanding direction is not limited to the means for urging using the pressing force of the elastic material 50. For example, by separately using an urging device such as an air cylinder, The movable mold 21 may be urged in the diameter expansion direction. Moreover, the heating timing of each molding die is not limited to the above description.

Needless to say, the shapes and structures of the composite products 9A and 9B are not limited to those shown in the drawings, and the shape and configuration of the molding die 100 can be changed accordingly. Therefore, the shape of the metal member 4 is not limited to the illustrated example, and the corner portion 42 may be stepped. If there is the extending portion 40, for example, the drive shaft is inserted into the central portion of the extending portion 40. It is good also as an annular | circular shape provided with the hole. Further, the number and shape of the lip portions 5a and 5b of the composite product 9B are not limited to the illustrated examples.
Further, the elastic material 50 may be supplied to the cavity 7 by a compression / direct pressure injection molding method as in the first embodiment, or by a compression / direct pressure molding method as in the second embodiment. . Although not shown, a supply method by injection may be used. The material of the metal member 4 is not particularly limited, and for example, stainless steel (austenitic stainless steel plate such as SUS304) or steel plate such as SPCC may be used, or may be formed by performing sheet metal processing or drawing. Further, the material of the elastic material 50 is not particularly limited, and is made of, for example, a rubber material such as an elastomer. Specifically, ethylene propylene rubber (EPM), acrylonitrile butadiene rubber (NBR), styrene butadiene rubber (SBR), acrylic rubber (ACM), hydrogenated acrylonitrile butadiene rubber (HNBR), silicone rubber (VMQ), fluorosilicone rubber (FVMQ), fluoro rubber (FKM), butyl rubber, polyisobutylene rubber, ethylene propylene diene copolymer rubber (EPDM), etc. are preferred It may be adopted.

DESCRIPTION OF SYMBOLS 100 Mold 1 First mold 10 Middle piece 11 Upper mold 2 Second mold 20 Fixed mold 21 Movable mold 21a Pressure contact part 21bc 2nd side surface (pressure direction conversion part)
22 Middle mold 22a Middle mold pressure contact portion 23 Lower mold 4 Metal member 40 Extension portion 40b Inner surface 41 Tube portion 41b Inner surface 42a Outer surface 50 Elastic material 5 Elastic body 6 Energizing member 7 Cavity 9A, 9B Composite product D Gap

Claims (7)

A molding metal that integrally molds a composite product having a metal member having a cylindrical portion and an extending portion extending radially inward from the cylindrical portion, and an elastic body made of an elastic material fixed to the outer surface of the metallic member In the mold,
A first mold and a second mold, which are relatively detachable and define a cavity for molding the elastic material;
The second mold includes a fixed mold that holds the extension portion from the inner surface side, and a movable mold having a pressure contact portion that presses against the inner surface during molding, and the movable mold is arranged in a radial direction. A molding die that is divided into a plurality of parts and is configured to be movable in the diameter increasing direction during molding. In the molding die according to claim 1,
A recess is formed in the movable mold,
The second mold further includes a middle mold that is fitted in the recess so as to allow the movable mold to move in the radial direction, and the first mold is fixed when the mold is molded. A middle piece that presses against the outer surface of the extension part relative to the mold; and an upper mold that presses the elastic material placed on at least one of the middle piece and the middle die to the cavity. The middle mold has a middle mold pressure contact portion that is in pressure contact with the outer surface of the cylindrical portion at the time of molding, and the movable mold applies a pressing force from the upper mold to the middle mold at the time of molding. A molding die having a pressure direction conversion portion that converts the force into a force that moves in the diameter expansion direction. In the molding die according to claim 1 or 2,
The movable mold is equally divided in the radial direction at a pitch of 90 ° or less. In the molding die according to any one of claims 1 to 3,
A molding die characterized in that an urging member for urging the movable die in a diameter reducing direction is provided on an outer peripheral side of the movable die. A metal member having a cylindrical portion and an extending portion extending radially inward from the cylindrical portion is disposed in a molding die composed of a first mold and a second mold that are relatively separable, and the molding is performed. In a method for manufacturing a composite product, in which an elastic material is supplied to a cavity formed in a mold, and an elastic body is integrally formed on the outer surface of the metal member,
Any one of the molding dies has a fixed mold that holds the extension part from the inner surface side and a pressure contact part that presses the inner surface of the cylindrical part during molding, and is divided into a plurality of parts in the radial direction. It is equipped with a movable mold that is sometimes movable in the diameter expansion direction,
A setting step of disposing the metal member on the stationary mold in a state in which a gap is secured between the pressure contact portion of the movable mold and the cylindrical portion of the metal member; and the first mold and the first mold Manufacturing a composite product comprising: a supplying step of supplying the elastic material to the cavity by relatively moving two molds close to each other; and a moving step of moving the movable mold in a diameter-expanding direction. Method. In the manufacturing method of the composite article according to claim 5,
A recess is formed in the movable mold,
In the recess, a middle mold having a middle mold pressure contact portion that is fitted so as to allow movement in the radial direction of the movable mold and is in pressure contact with the outer surface of the cylindrical portion at the time of molding, In the moving step, the pressing force in the supplying step for pressing and supplying the elastic material to the cavity is transmitted to the movable mold through the middle mold, and the movable mold is moved in the diameter expansion direction. A method for producing a composite product, comprising: In the manufacturing method of the composite article of Claim 5 or Claim 6,
The method for manufacturing a composite product, wherein the metal material is made of stainless steel.

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