JP5285268B2 - Mold for molding - Google Patents

Description

  The present invention relates to a molding die used for integrally molding a rubber member on a cylindrical metal fitting.

  Conventionally, a rubber bush R disposed on a vehicle suspension or the like as shown in FIG. 3 is known. This type of rubber bush R generally has an inner cylinder T1 and an outer cylinder T2 surrounding the outer periphery thereof, as shown in the figure, and the inner cylinder T1 and the outer cylinder T2 are made of rubber members 103. It has a connected structure.

  The rubber bush R having such a structure is integrated by disposing an inner cylinder T1 and an outer cylinder T2 in a cavity of a molding die, and injecting a rubber material into the inner cylinder T1 and performing vulcanization molding.

  For example, FIG. 4 shows an example of the vulcanization molding, in which the molding die 105 is composed of three partial dies, an upper die 105a, an intermediate die 105b, and a lower die 105c. By combining these, a cavity is formed inside.

  Inside the cavity, a pair of positioning pins 106, 106 provided on the metal fixture fixing portions of the upper mold 105a and the lower mold 105c extend in an opposing manner, and the intermediate mold 105b has a slight amount than the outer cylinder T2. A positioning hole 107 having a large diameter is formed in the inner cylinder T1, and the positioning pins 106 and 106 are inserted into the inner cylinder T1, while the outer cylinder T2 is inserted into the positioning hole 107 so as to be positioned coaxially with each other. The The upper mold 105a and the lower mold 105c are pressed against the end portions of the inner and outer cylinders T1 and T2 from above and below, so that the inner and outer cylinders T1 and T2 are fixed immovably.

  Then, an unvulcanized rubber material is injected into the cavity from the rubber injection hole 105d provided in the upper mold 105a and is heated and held, whereby the rubber cross-linking proceeds to form the rubber member 103. An integrally molded product having the above configuration can be obtained.

  For example, Patent Documents 1 and 2 are known as conventional techniques related to this type of molding die.

  In Patent Document 1, a center rod (positioning pin) of an upper die (upper die) is inserted into an inner cylinder, and a guide pin (positioning) close to an outer peripheral surface of an outer cylinder is guided to a guide pin protruding downward from the upper die. The structure which forms a hole) and positions an inner and outer cylinder is disclosed.

  In Patent Document 2, the upper die and the lower die (metal fixtures) that are pressed against both end surfaces of the inner cylinder in the axial direction are formed of resin, and variations in the length of the inner cylinder in the axial direction are detected. Disclosed is a mold that can be absorbed.

In addition to the rubber bush having the above-described configuration, the rubber bush includes a rubber bush having only an inner cylinder (see Patent Document 2) and an intermediate cylinder between the inner and outer cylinders.
Japanese Patent Publication No. 3-79166 JP 2002-240049 A

  By the way, in recent years, with this type of rubber bush, the demand for accuracy has been increasing, and the variation in the degree of coaxiality due to the tolerance of the inner and outer cylinders is becoming a problem.

  For example, referring to FIG. 4, since the outer diameter dimension of the positioning pin 106 is set smaller than the minimum allowable inner diameter dimension of the inner cylinder T1, the positioning pin 106 is usually positioned even if the inner diameter dimension of the inner cylinder is within the standard. A slight gap is generated between 106 and the inner cylinder T1. For this reason, when the inner cylinder T1 is disposed in the cavity, a positional shift with respect to the axis A is caused by the gap, and the coaxiality varies among the molded products. Even when the outer cylinder T2 is positioned, the positional deviation with respect to the axis A is caused between the positioning hole 107 and the positioning hole 107, so that the variation in the coaxiality between the molded products is further increased.

  It is difficult to adjust such a slight misalignment with high accuracy, and if it is adjusted for each molding, the work efficiency is lowered and the productivity is deteriorated.

  The present invention has been made in view of the above points, and the object of the present invention is to provide a molding device that has a simple configuration and does not increase the work load, and can stably provide a highly accurate coaxiality. To provide molds.

  In order to achieve the above object, the present invention provides a cylindrical member such as the inner and outer cylinders of the rubber bush in the cavity in the positioning portion adjacent to the peripheral surface of the cylindrical member in order to position the cylindrical member in the cavity. An elastic member that is elastically deformed in contact with the peripheral surface of the metal fitting is provided so that the positional deviation is minimized even if there is a gap due to tolerance.

Specifically, it is provided with a plurality of partial dies in which cavities are partitioned and formed by combining them, and a cylindrical metal fitting is placed in the cavity to inject a rubber material, and the cylindrical metal fitting and the rubber material are combined. A pair of metal fitting fixing parts for integrally vulcanizing and molding, which are pressed against both ends of the cylindrical metal fitting in the cylinder axial direction when the mold is clamped to fix the cylindrical metal fitting so that it cannot move. When,
A positioning portion for positioning the cylindrical bracket in a radial direction in proximity to the peripheral surface of the cylindrical bracket when attached, and elastically deforming the positioning portion in contact with the peripheral surface of the cylindrical bracket It is set as the structure by which the elastic member to be provided is provided.

  According to this configuration, since the positioning part close to the peripheral surface of the cylindrical metal fitting is provided in the cavity, when the cylindrical metal fitting is arranged in the cavity, the positioning part is regulated, Radial positioning is performed.

  At this time, there is a gap based on at least a tolerance between the peripheral surface of the cylindrical metal fitting and the positioning portion, and there is a possibility that a positional deviation may occur due to rattling. Since the elastic member that is elastically deformed in contact with the peripheral surface is provided, the cylindrical metal fitting is pressed by the elastic member, and rattling is suppressed.

  In other words, even if there are gaps of different sizes between the positioning portion and the cylindrical fitting, the cylindrical fitting can be stably and accurately positioned at an appropriate position in the cavity by the elastic action of the elastic member. become.

  Then, when the cylindrical metal fitting is fixed in such a manner that both ends in the cylinder axial direction are pressed against each other by the metal fitting fixing portion in such a state, the unvulcanized rubber material is injected. Also, vulcanization molding is performed without shifting the position, and the cylindrical metal fitting and the rubber material are integrated. As a result, regardless of the dimensional accuracy of the cylindrical metal fitting, it is possible to stably perform molding with excellent coaxiality accuracy.

  For example, when the cylindrical fitting includes an inner cylinder of a rubber bush, a positioning pin that extends from at least one of the fitting fixing parts into the cavity and is inserted into the inner cylinder is used as the positioning part. A first elastic member that elastically deforms in contact with the inner peripheral surface of the inner cylinder can be provided on the outer peripheral surface of the positioning pin.

  In this configuration, a positioning pin as a positioning portion is provided, and the inner cylinder is positioned by being inserted into the positioning pin. And since the 1st elastic member which contacts the inner peripheral surface of an inner cylinder and elastically deforms is provided in the outer peripheral surface of the positioning pin, even when a clearance gap exists between an inner cylinder and a positioning pin, an inner cylinder Is pressed to an appropriate position by the first elastic member. As a result, even if there is some variation in the inner diameter of the inner cylinder, the inner cylinder can be stably placed at an appropriate position simply by pushing the inner cylinder into the positioning pin, and molding with excellent coaxiality accuracy. It can be performed.

  Further, when the cylindrical fitting includes an outer cylinder of a rubber bush, the positioning mold has a positioning hole into which the outer cylinder is inserted, and a partial mold that defines the positioning hole A second elastic member that elastically deforms in contact with the outer peripheral surface of the outer cylinder may be provided on the inner peripheral surface of the outer cylinder.

  In this configuration, a positioning hole as a positioning portion is provided, and the outer cylinder is positioned by being inserted into the positioning hole. A second elastic member that elastically deforms in contact with the outer peripheral surface of the outer cylinder is provided on the inner peripheral surface of the partial mold that defines the positioning hole. Even when there is a gap, the outer cylinder is pressed to an appropriate position by the second elastic member. As a result, even if there is some variation in the outer diameter of the outer cylinder, the outer cylinder can be stably placed at an appropriate position simply by pushing the outer cylinder into the positioning hole, and the coaxiality accuracy is excellent. Molding can be performed.

  For example, an O-ring can be used as the first elastic member. An O-ring is a general-purpose product that is easily available and relatively inexpensive. It can be in contact with the entire circumference of the inner peripheral surface of the inner cylinder and exert a uniform elastic action. The degree can be obtained stably.

  By the way, in this type of mold, cleaning is periodically performed to remove dirt in the cavity. At that time, since the release agent baked on the contact surface of the cavity with the rubber member is also removed, a baking operation for baking the release agent on the mold is performed after cleaning. In this baking operation, it is necessary to heat the mold to about 300 ° C., but the first elastic member made of a general material such as an O-ring does not have such heat resistance.

  Therefore, it is preferable that the positioning pin is detachably provided on the bracket fixing portion. Since the positioning pin is inserted into the inner cylinder, there is no need to bake the release agent, and before the molding die is baked, the first elastic member is removed from the mold fixing portion together with this, so that the first elastic member There is no need to worry about heat resistance, and maintenance is easy.

  In addition, the positioning pin may be configured by a pair of pins extending coaxially so as to face both the metal fixtures, and the first elastic member may be detachably attached to the base end portion of each pin.

  Then, since the both ends of the inner cylinder are positioned by the first elastic member, the positioning accuracy of the inner cylinder is improved. If each pin is removed from the metal fitting fixing part, the first elastic member can be easily replaced, so that the maintenance becomes even easier.

  On the other hand, as the second elastic member, it is preferable to use a so-called oil seal member which is originally used for sealing oil. This is because the oil seal member includes a ring-shaped metal ring and a ring-shaped elastic body provided integrally therewith, and can be suitably used as a positioning member for the outer cylinder.

  That is, since the second elastic member has a larger diameter than the first elastic member, there is a problem that when the outer cylinder is removed from the positioning hole, the outer cylinder is pulled or removed from the positioning hole when the outer cylinder is removed from the positioning hole. there were. In that respect, if the metal ring of the oil seal member as described above is securely fixed to the partial mold, such a problem can be eliminated and the molding operation can be performed efficiently.

  In this case, the part facing the end of the positioning hole of the partial mold in which the positioning hole is formed is configured to be detachable, and by fixing the metal ring to the detachable part, similarly to the previous positioning pin, During the baking operation, the oil seal member can be easily removed together with the mounting member so that the baking operation can be performed without any problem. If it does so, the general purpose goods which do not have high temperature tolerance can be utilized for the 2nd elastic member, it is economical, and the maintenance of the metal mold for molding becomes easy.

  As described above, according to the molding die of the present invention, the positional deviation and the variation in the coaxiality are made extremely small without increasing the work load while being a simple and economical configuration. Therefore, stable and highly accurate molding can be realized.

  Hereinafter, embodiments of a molding die according to the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 shows the main part of the molding die. As shown in the figure, the molding die includes three partial molds including an upper mold 1a, a lower mold 1b, and an intermediate mold 1c that are combined in the vertical direction. As a result, the cavity 2 is defined in the interior. A rubber bush in which the cylindrical metal fitting and the rubber material are integrated is manufactured by arranging a cylindrical metal fitting in the cavity 2, injecting an unvulcanized rubber material from the rubber injection hole 3, and performing vulcanization molding. be able to.

  In this embodiment, a rubber bush in which the inner cylinder T1 and the outer cylinder T2 (cylindrical metal fittings) are connected to each other by a rubber member will be described as an example of the rubber bush. The present invention is not limited to this, and is also applicable to a rubber bush having an intermediate cylinder between the inner and outer cylinders T1 and T2, and a rubber bush having only the inner cylinder T1 and the outer cylinder T2.

  Each of the partial molds is made of a metal block body, and the joint surfaces of the lower surface of the upper mold 1a, the upper and lower surfaces of the intermediate mold 1c, and the upper surface of the lower mold 1b are all formed smoothly, and there is no gap. It is configured so that it can be closely integrated. Then, in these integrated partial molds, cavities 2 made up of a substantially cylindrical space are formed in a state where the axis A is directed in the vertical direction corresponding to each rubber bush.

  In the cavity 2, the inner cylinder T 1 and the outer cylinder T 2 are arranged so that the cylinder axes thereof are coaxial with the axis A, and the circular upper mold 1 a that defines the cavity 2. At the center of the lower surface and the upper surface of the lower mold 1b, there are respectively an upper inner cylinder fixing portion 4a and a lower inner cylinder fixing portion that press the respective end faces of the inner cylinder T1 and fix the inner cylinder T1 so that it cannot move. 4b (metal fitting fixing part) is provided. The upper inner cylinder fixing portion 4a and the lower inner cylinder fixing portion 4b are formed by ring-shaped smooth surfaces with the axis A as the center, and face each other facing the cavity 2.

  As a positioning part for positioning the inner cylinder T1 in the radial direction at the time of attachment, the center of each of the pair of inner cylinder fixing parts 4a and 4b extends in the cavity 2 coaxially with the axis A, and its tip A pair of pins 5 and 5 (positioning pins) facing each other are detachably provided. On the other hand, a positioning hole 10 is provided in the intermediate mold 1c as a positioning portion for positioning the outer cylinder T2 in the radial direction.

  First, the pins 5 and 5 will be described in detail. Each pin 5 has the same shape, and has a pin body 50 slightly smaller in diameter than the inner diameter of the inner cylinder T1 and a lower end portion of the pin body 50. A base end portion 51 that is continuously formed to have a smaller diameter than the pin body 50, a male screw portion 52 that protrudes downward from the base end portion 51 to form a male screw, and a slightly narrowed upper end of the pin body 50 And an insertion hole 53 of a hexagon wrench formed in the recess.

  On the other hand, the base end portion 51 of the pin 5 extends in parallel with the axis A at the center of the lower surface of the upper inner cylinder fixing portion 4a and the center of the upper surface of the lower inner cylinder fixing portion 4b facing the cavity 2. A pin insertion hole 54 to be fitted is opened, and a female screw portion 55 that is connected to the bottom portion of the pin 5 and screwed with the male screw portion 52 of the pin 5 is formed as a recess.

  The pins 5 and 5 are fixed to the inner cylinder fixing parts 4a and 4b by screwing the male screw part 52 to the female screw part 55 using a hexagon wrench. At the time of attachment, the inner cylinder T1 is positioned in the radial direction by being inserted into these pins 5 and 5.

  In order to improve the coaxiality of the inner cylinder T1 at the time of positioning, an O-ring 6 (first elastic member) is detachably attached to the base end portion 51 of each pin 5.

  Specifically, the longitudinal dimension of the base end portion 51 of each pin 5 is set slightly larger than that of the pin insertion hole 54, and the outer peripheral surface of the base end portion 51 of the root of the pin 5 that is screwed. In addition, a groove-shaped mounting portion 56 is formed over the entire circumference. The O-ring 6 is attached to the attachment portion 56 in a properly stretched state, and the outer peripheral side portion of the attached O-ring 6 protrudes radially outward from the outer peripheral surface of the pin body 50, and the inner cylinder It is a deformable margin that elastically deforms in contact with the inner peripheral surface of T1.

  What is necessary is just to select the thing of the dimension which fits this structure for the O-ring 6 to mount from general-purpose products. However, considering the heat resistance during vulcanization molding, the material is preferably silicone rubber or fluororubber.

  The groove width dimension (vertical dimension in the figure) of the mounting portion 56 is preferably larger than the thickness dimension of the O-ring 6. That is, by providing a play dimension that allows the O-ring 6 to move up and down in the direction of the axis A, even when the O-ring 6 is dragged by the inner cylinder T1 when the inner cylinder T1 is attached or detached, the O-ring 6 can be attached to the mounting portion 56. The O-ring 6 can be prevented from coming off from it.

  Around each of the inner cylinder fixing parts 4a and 4b, an annular ridge 7 projecting inside the cavity 2 is provided so as to surround the inner cylinder fixing parts 4a and 4b. There are provided an upper outer cylinder fixing portion 8a and a lower outer cylinder fixing portion 8b (metal fitting fixing portion) which are brought into pressure contact with each of the end surfaces and fix the outer cylinder T2 so as not to move.

  The upper outer cylinder fixing portion 8a is configured to be flush with the joint surface with the intermediate mold 1c, while the lower outer cylinder fixing portion 8b has an outer diameter larger than the inner diameter of the outer cylinder T2, This is configured as a narrow annular smooth outer cylinder receiving surface having an outer diameter smaller than the outer diameter of the outer cylinder T2. The portion connected to the outside of the lower outer cylinder fixing portion 8b is formed in a step shape lower than this, and serves as a mounting surface for the intermediate mold 1c that is in close contact with the lower surface of the intermediate mold 1c.

  Next, the positioning hole 10 will be described in detail. The upper and lower surfaces of the intermediate mold 1c are formed as through holes that penetrate the upper and lower surfaces of the intermediate mold 1c and are slightly larger than the outer diameter of the outer cylinder T2. When combined with the mold 1b, the axis is configured to be coaxial with the axis A. At the time of attachment, the outer cylinder T2 is inserted into the positioning hole 10, so that the inner peripheral surface of the intermediate mold 1c defining the positioning hole 10 is close to the outer peripheral surface of the outer cylinder T2, and the outer cylinder T2 has a radius. Will be positioned in the direction.

  In this embodiment, the oil seal member 11 (second elastic member) is fixed to the lower end portion of the positioning hole 10 in order to improve the coaxiality of the outer cylinder T2 at the time of positioning.

  The oil seal member 11 is a general-purpose component that is used, for example, to seal the bearing portion of the rotating shaft and prevent leakage of lubricating oil or the like. As shown in the enlarged view of FIG. And a ring-shaped rubber elastic body 61 provided integrally therewith.

  Specifically, the metal ring 60 of the present embodiment has an L-shaped cross section having a cylindrical peripheral wall portion 60a and a flange portion 60b that protrudes radially inward from the lower end thereof. A substantially rectangular rubber elastic body 61 is integrated with an end portion of the collar portion 60b of the 60 so as to project inward. The structure of the oil seal member 11 is not limited to this, and may be selected from general-purpose products as necessary. However, considering the heat resistance during vulcanization molding, the rubber elastic body 61 is preferably made of silicone rubber or fluororubber.

  On the other hand, on the lower end side of the positioning hole 10 of the intermediate mold 1c, a notch 70 is formed by cutting out the circumference in a ring shape, and as a part of the intermediate mold 1c so as to compensate for the notch 70. An annular mounting member 72 is fastened and fixed by bolts B and B so as to be detachable.

  The upper end portion on the inner peripheral side of the mounting member 72 is close to the lower outer cylinder fixing portion 8b of the lower mold 1b and faces the lower end portion of the positioning hole 10, and there is a metal of the oil seal member 11 above. The ring 60 is fixed with the rubber elastic body 61 facing inward.

  A portion on the inner peripheral side of the rubber elastic body 61 of the fixed oil seal member 11 protrudes radially inward from the inner peripheral surface of the intermediate mold 1c that defines the positioning hole 10, and the outer peripheral surface of the outer cylinder T2 It is deformable to be elastically deformed in contact with. Further, an outer cylinder support portion 73 is provided below the oil seal member 11 to receive and support the lower end surface of the outer cylinder T2 inserted into the positioning hole 10.

  Next, a rubber bush molding process in the molding die having the above configuration will be described with reference to FIG.

  First, the inner cylinder T1 is inserted into the pin 5 of the lower mold 1b. At this time, since the outer diameter of the pin main body 50 is formed smaller than the inner diameter of the inner cylinder T1 in consideration of tolerances, it is easy to insert, but the inner peripheral surface of the inner cylinder T1 and the outer peripheral surface of the pin main body 50 There is a slight gap between the inner cylinder T1 and the coaxiality becomes unstable.

  However, when the inner cylinder T1 is pushed in until the lower end surface of the inner cylinder T1 is in contact with the lower inner cylinder fixing portion 4b, that is, until the O-ring 6 is in contact with the inner peripheral surface of the inner cylinder T1, the O-ring 6 is elastically deformed. The inner cylinder T <b> 1 does not rattle and is pressed so as to be coaxial with the axis A. That is, even if there is some variation in the inner diameter of the inner cylinder T1, the accuracy of the coaxiality of the inner cylinder T1 can be stably improved by the same operation as before.

  On the other hand, the outer cylinder T2 is inserted into the positioning hole 10 of the intermediate mold 1c. At this time, since the inner diameter of the positioning hole 10 is larger than the outer diameter of the outer cylinder T2 in consideration of tolerances, it is easy to insert, but the outer peripheral surface of the outer cylinder T2 and the inner peripheral surface of the positioning hole 10 There is a slight gap between the outer cylinders T2 that makes the coaxiality unstable.

  However, when the outer cylinder T2 is pushed in until the lower end surface of the outer cylinder T2 is in contact with the outer cylinder support portion 73, that is, until the rubber elastic body 61 of the oil seal member 11 is in contact with the outer peripheral surface of the outer cylinder T2, the rubber elastic body 61 is pushed. Is elastically deformed and the outer cylinder T2 is pressed so as to be coaxial with the axis A without rattling. That is, even if there is some variation in the outer diameter dimension of the outer cylinder T2, the accuracy of the coaxiality of the outer cylinder T2 can be stably improved by the same operation as before.

  Then, after placing the intermediate mold 1c with the outer cylinder T2 mounted on the lower mold 1b with the inner cylinder T1 attached, the upper mold 1a is further placed at a predetermined position on the upper surface of the intermediate mold 1c. By mounting, each partial metal mold | die 1a, 1b, 1c is combined and integrated.

  Even when the upper mold 1a is placed, the pin 5 of the upper mold 1a is inserted into the inner cylinder T1 and there is a slight gap between the pin body 50 and the inner cylinder T1 as in the previous case. When the upper end surface of the inner cylinder T1 is pushed in until it comes into contact with the upper inner cylinder fixing portion 4a, the O-ring 6 is elastically deformed so that the inner cylinder T1 is not rattled and is pressed so as to be coaxial with the axis A. Furthermore, the coaxiality accuracy is improved.

  Next, by clamping each of the integrated partial molds 1a, 1b, 1c, both end surfaces of the inner cylinder T1 are pressed against the upper and lower inner cylinder fixing portions 4a, 4b, and the outer cylinder T2 is both end surfaces thereof. Are pressed against the upper and lower outer cylinder fixing portions 8a and 8b, and are fixed so as not to move.

  Subsequently, an unvulcanized rubber material is injected into the cavity 2 from the rubber injection hole 3, but there is no possibility that the inner and outer cylinders T1 and T2 are displaced, and a highly accurate positioning state is maintained. . Thereafter, by maintaining the molding die at about 170 ° C., the crosslinking proceeds, and the inner and outer cylinders T1, T2 and the rubber material are integrated to complete the molding process.

  By the way, since the molding die is soiled in the cavity 2 when mass-produced, a cleaning process is periodically performed to remove the soiling. In the cleaning process, the mold release agent baked on the contact surface of the cavity 2 with the rubber material is also removed. Therefore, after the cleaning, a baking operation for baking the mold release agent on the mold is performed.

  However, in this baking operation, since it is necessary to heat the molding die to about 300 ° C., the O-ring 6 and the rubber elastic body 61 having insufficient heat resistance may be deformed.

  Therefore, before the baking operation, the pins 5 and 5 to which the O-ring 6 is attached are removed from the upper mold 1a and the lower mold 1b, and the mounting member 72 to which the oil seal member 11 is fixed is attached to the intermediate mold 1c. It is possible to perform the baking operation without worrying about the heat resistance of the O-ring 6 etc.

  In addition, there is an advantage that the O-ring 6 and the oil seal member 11 can be easily replaced and maintenance is facilitated.

  As described above, according to the molding die of the present invention, a rubber bush having a stable quality can be mass-produced at a low cost while performing almost the same work as before.

  The molding die of the present invention is not limited to the above-described embodiment, but includes various other configurations.

  That is, in the above-described embodiment, the molding die is constituted by three partial dies. However, the present invention is not limited to this. For example, the intermediate die 1c is integrated with the lower die 1b or the upper die 1a. It can also consist of a partial body mold.

  The positioning pin 5 is provided in both the inner cylinder fixing portions 4a and 4b, but only one of them may be provided.

  The first elastic member may be provided at a portion other than the root of the pin 5. The second elastic member may be provided not only at the lower end portion of the positioning hole 10 but also at the intermediate portion and the upper end portion, or may be provided at both ends.

  As the second elastic member, in addition to the configuration using the oil seal member 11, for example, a configuration in which the rubber elastic body 61 is molded integrally with the mounting member 72, or a plate ring-shaped rubber piece is used as the intermediate mold 1 c and the mounting member. For example, a configuration in which the inner peripheral portion protrudes into the positioning hole 10 when sandwiched between the positioning hole 72 and the like is conceivable.

  Moreover, the attachment member 72 does not necessarily need to be annular, and may be any member that can removably fix the second elastic member at a predetermined position.

  The cylindrical fitting is not necessarily limited to metal, and may be a combination of metal and resin or a rigid cylindrical member made of resin.

It is sectional drawing which shows the principal part of the metal mold | die for shaping | molding of this invention. It is a figure for demonstrating the formation process of the metal mold | die of this invention. It is a perspective view which shows the conventional rubber bush. It is sectional drawing which shows the principal part of the conventional metal mold | die.

Explanation of symbols

1a Upper mold (partial mold)
1b Lower mold (partial mold)
1c Intermediate mold (partial mold)
2 Cavity 4a Upper inner cylinder fixing part (metal fixing part)
4b Lower inner cylinder fixing part (fitting fixing part)
5 pin (positioning part)
6 O-ring (first elastic member)
8a Upper outer cylinder fixing part (metal fixing part)
8b Lower outer cylinder fixing part (fitting fixing part)
10 Positioning hole (positioning part)
11 Oil seal member (second elastic member)
60 Metal ring 61 Rubber elastic body 72 Mounting member T1 Inner cylinder T2 Outer cylinder

Claims (6)

A plurality of partial molds each having a cavity formed therein by being combined are provided, and an inner cylinder and an outer cylinder of a rubber bush are disposed in the cavity to inject a rubber material, and the inner cylinder , the outer cylinder, and rubber A molding die for integrally vulcanization molding of materials,
A pair of metal fitting fixing parts that press-contact the both ends of the inner cylinder and the outer cylinder in the cylinder axial direction at the time of mold clamping and immobilize the inner cylinder and the outer cylinder ; and
A positioning portion for positioning the inner cylinder and the outer cylinder in the radial direction in proximity to the peripheral surfaces of the inner cylinder and the outer cylinder at the time of attachment;
As a positioning part of the inner cylinder, it has a positioning pin that extends from at least one of the metal fitting fixing parts into the cavity and is inserted into the inner cylinder,
A first elastic member that elastically deforms in contact with the inner peripheral surface of the inner cylinder is provided on the outer peripheral surface of the positioning pin,
As a positioning part of the outer cylinder, it has a positioning hole into which the outer cylinder is inserted,
A molding die, wherein a second elastic member that elastically deforms in contact with the outer peripheral surface of the outer cylinder is provided on an inner peripheral surface of the partial mold that defines the positioning hole . In the molding die according to claim 1,
An O-ring is used for the first elastic member. In the molding die according to claim 1 or 2,
A molding die, wherein the positioning pin is detachably attached to the metal fixture. In the molding die according to any one of claims 1 to 3,
The positioning pin is composed of a pair of pins extending coaxially facing both metal fitting fixing parts,
A molding die, wherein the first elastic member is detachably attached to a base end portion of each pin. In the molding die according to any one of claims 1 to 4,
An oil seal member including a ring-shaped metal ring and a ring-shaped elastic body provided integrally with the second elastic member is used,
A mold for molding, wherein the metal ring is fixed to a partial mold. The molding die according to claim 5,
The partial mold in which the positioning hole is formed is configured such that a part facing the end of the positioning hole is detachable,
A metal mold having a metal ring fixed to the detachable part .

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