JP4953966B2 - Mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding die which can be improved in working efficiency when replacing a seal ring inserted into an insert die. <P>SOLUTION: The seal ring 50 has an inner peripheral body part 54 and an inner peripheral enlarged diameter part 55 and is configured to position an inner peripheral step part 56 between the inner peripheral enlarged diameter part 55 and the inner peripheral body part 54 by making the internal diameter of the inner peripheral enlarged diameter part 55 greater than the internal diameter of the inner peripheral body part 54 and, therefore, when the seal ring 50 is taken out from the insert die 22, the inner peripheral step part 56 is utilized (for example, by making a taking-out tool be engaged with the inner peripheral step part 56) and pushing the seal ring 50 upward, and the seal ring 50 is pushed upward and, thereby, the seal ring 50 can be easily taken-out from a fitting hole part 22b. Consequently, in the replacement work of the seal ring 50 which is periodically needed, the improvement in the working efficiency can be achieved. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a mold, and more particularly to a mold that can improve workability when a seal ring fitted in a nested mold is replaced.

  As an anti-vibration device used in automobiles (for example, vulcanized molded products such as anti-vibration bushes mounted on wheel suspensions and engine mounts that support engines) There is known one in which an antivibration base made of a rubber-like elastic material is interposed between cylinders (or an outer cylinder is omitted).

  In general, in such a vibration isolator, a lower mold and an upper mold are closed, and a nested mold is arranged opposite to each other, and a cavity is formed around the inner cylinder by the nested mold. A molding material to be a rubber-like elastic material is injected into the cavity from the injection hole and vulcanized (Patent Document 1).

Here, the upper and lower end portions of the inner cylinder are tightly fitted on the outer peripheral surface by the fitting hole portion formed in the center portion of the nested mold and the seal ring fitted in the fitting hole portion. The molding material filled in the cavity is prevented from passing through the gap between the outer peripheral surface of the end portion of the inner cylinder and the inner peripheral surface of the fitting hole and the seal ring to become end surface burrs. .
JP 2002-79551 A (FIG. 2 etc.)

  By the way, when the inner peripheral surface of the seal ring is worn, the end outer peripheral surface of the inner cylinder cannot be tightly fitted, which causes end surface burrs. For this reason, when a predetermined number of vulcanization moldings of the vibration isolator are performed, replacement of the seal ring (extraction from the nesting die) is performed periodically.

  However, the conventional mold described above has a problem that it is difficult to engage the extraction jig with the seal ring when the seal ring is extracted from the fitting hole of the insert mold, and the workability is poor. there were.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a molding die that can improve workability when a seal ring is extracted from a nested die.

  In order to achieve this object, the mold according to claim 1 has at least a vibration-proof base made of a rubber-like elastic material and a cylindrical inner cylinder to which the vibration-proof base is vulcanized and bonded to the outer periphery. A vibration isolator is formed by vulcanization, and includes a lower mold and an upper mold that are vertically opposed to each other and have a nested mold that molds the outer shape of the vibration isolating base, and the nested mold. A support pin that is inserted from a lower end opening of the inner cylinder installed in a mold and engages the lower end of the inner cylinder; an inner cylinder presser that is concentrically opposed to the support pin and engages the upper end of the inner cylinder; In the state where the lower mold and the upper mold are closed, a cavity is formed on the outer peripheral side of the inner cylinder supported by the support pin and the inner cylinder presser, and a rubber-like elasticity is formed in the cavity. Filled with the molding material to be , And a cylindrical seal ring, and the insert mold is concentrically connected to the fitting portion to be fitted to the outer periphery of the end portion of the inner cylinder and the fitting portion. A fitting hole portion into which the seal ring is fitted, and the telescoping fitting hole portion is connected to the small diameter hole portion connected to the fitting portion and the small diameter hole portion. And an enlarged-diameter hole portion having an inner diameter larger than that of the small-diameter hole portion, and the seal ring constitutes an outer peripheral surface of the seal ring and an enlarged-diameter hole portion in the nested fitting hole portion A gap is formed between the outer diameter-enlarged portion fitted inside and the outer peripheral surface of the seal ring, the outer diameter being smaller than the outer diameter-enlarged portion, and the small-diameter hole portion in the nested fitting hole portion. An outer peripheral body portion, and an outer peripheral step portion positioned between the outer peripheral enlarged diameter portion and the outer peripheral body portion, An inner peripheral body portion that forms an inner peripheral surface of the seal ring and that the inner cylinder presser is fitted so as to be slidable in a vertical direction, and an inner peripheral surface that forms an inner peripheral surface of the seal ring and has an inner diameter larger than the inner peripheral body portion. An inner peripheral enlarged diameter portion which is enlarged and is fitted on the outer periphery of the end portion of the inner cylinder, and an inner peripheral step portion located between the inner peripheral enlarged diameter portion and the inner peripheral trunk portion.

  The molding die according to claim 2 is the molding die according to claim 1, wherein the upper and lower end surfaces of the inner cylinder are configured in a saw-toothed uneven shape, and the outer periphery of the upper and lower ends is configured in a tapered shape. The seal ring has an inner diameter of the inner peripheral body portion larger than an outer diameter of a tapered upper and lower ends of the inner cylinder, and the inner peripheral stage in a state where the lower mold and the upper mold are closed. The vertical position of the portion is aligned with the lower end of the inner cylinder presser, and the gap between the outer peripheral body portion of the seal ring and the small diameter hole portion of the telescopic fitting hole portion is the outer peripheral body portion of the seal ring. Are formed continuously over the entire range, and the inner peripheral step portion is positioned closer to the nested fitting portion than the outer peripheral step portion.

  According to the mold of claim 1, the seal ring constitutes an inner peripheral surface of the seal ring, and an inner peripheral body portion in which the inner cylinder presser is slidably displaced in the vertical direction (axial direction), and the seal ring An inner peripheral diameter-enlarged portion that is fitted on the outer periphery of the end portion of the inner cylinder while configuring the inner peripheral surface, and by making the inner diameter of the inner peripheral enlarged-diameter portion larger than the inner diameter of the inner peripheral body portion, Since the inner peripheral step portion is positioned between the inner peripheral barrel portion and the inner peripheral barrel portion, the inner peripheral step portion is used (for example, smaller than the inner diameter of the inner peripheral enlarged diameter portion and smaller than the inner diameter of the inner peripheral barrel portion). The seal ring can be pushed out (extruded) from the inside of the fitting hole to the outside by engaging the end surface of the cylindrical extraction jig having a large diameter with the inner peripheral step portion, and as a result, There is an effect that the seal ring can be easily removed from the nested mold. Thereby, the workability | operativity can be improved in the replacement | exchange operation | work of a seal ring required regularly.

  Here, the nested fitting hole portion constitutes an inner peripheral surface of the fitting hole portion and a small-diameter hole portion continuously provided to the fitted portion and an inner peripheral surface of the fitting hole portion. And a seal ring that forms an outer peripheral surface of the seal ring and that is fitted in the enlarged hole portion of the nested fitting hole portion. When the seal ring is fitted into the nested fitting hole, the outer diameter body and the outer peripheral body of which the outer diameter is smaller than that of the outer diameter expansion portion and the outer diameter of the seal ring are formed. Since the gap is formed between the small-diameter hole in the nested fitting hole and the outer periphery of the seal ring, the outer periphery of the end of the inner cylinder is tightly fitted to generate end face burrs. While suppressing the wear of the seal ring, the replacement cycle can be extended and the seal There is an effect that it is possible to improve the workability to easily pull out the inner cylinder from the grayed.

  In other words, in the configuration having no gap, if the inner diameter of the seal ring is given a margin with respect to the outer diameter of the inner cylinder (the tightening margin is loosened), the outer periphery of the end of the inner cylinder is tightly covered by the seal ring. It cannot be fitted, causing end surface burrs. On the other hand, if the inner diameter of the seal ring is made too small relative to the outer diameter of the inner cylinder (tightening margin is too large), the outer periphery of the end of the inner cylinder is too tightly fitted by the seal ring, and the wear of the seal ring is accelerated. As a result, the replacement cycle is shortened, and the inner cylinder is hardly detached from the seal ring when the mold is opened, resulting in a decrease in workability.

  On the other hand, according to the present invention, the outer diameter-enlarged portion of the seal ring is fitted into the enlarged-diameter hole portion of the nested fitting hole portion, and the small-diameter hole portion of the nested fitting hole portion is in that state. Since a gap is formed between the outer peripheral body portion of the seal ring and the seal ring, the seal ring can be easily elastically expanded in diameter. Therefore, even when the inner diameter of the seal ring is sufficiently smaller than the outer diameter of the inner cylinder (tightening margin is secured) to suppress the generation of end face burrs, the wear of the seal ring is suppressed and the replacement cycle is extended. In addition, the inner cylinder can be easily removed from the seal ring when the mold is opened, and workability can be improved.

  Further, since only the outer peripheral enlarged diameter portion of the seal ring is fitted into the enlarged diameter hole portion of the nested fitting hole portion, the seal ring is pushed up (extruded) from the inside of the fitting hole portion. There is an effect that it is easy to remove from the nested mold. In this case, since the inner diameter of the enlarged-diameter hole portion is larger than the inner diameter of the smaller-diameter hole portion in the nested fitting hole portion, compared with the case where these relationships are made smaller, While tightly fitting the outer periphery of the end of the tube to suppress end surface burrs, the wear of the seal ring can be suppressed to extend the replacement cycle, and the inner tube can be easily removed from the seal ring. There is an effect that workability can be improved. Furthermore, there is an effect that the inner cylinder presser can be smoothly moved without obstructing the sliding displacement in the vertical direction (axial direction).

  According to the mold of claim 2, in addition to the effect of the mold of claim 1, the inner diameter of the inner peripheral body of the seal ring is made larger than the outer diameter of the upper and lower ends (tips) of the inner cylinder. Therefore, in the state where the lower mold and the upper mold are closed, the end of the inner cylinder can be pressed in the axial direction only by the inner cylinder presser, and the inner peripheral step of the seal ring is the end of the inner cylinder or the inclination. Contact with the surface can be avoided.

  Here, when the dimensional tolerance of the inner cylinder is large, when the lower die and the upper die are closed, for example, the ridge line portion between the inner peripheral body portion and the inner peripheral step portion of the seal ring is formed on the tapered inclined surface of the inner cylinder. The ride-up and the seal ring may be radially expanded. In this case, the outer periphery of the end of the inner cylinder cannot be tightly fitted by the seal ring, and an end surface burr is generated.

  On the other hand, according to the present invention, as described above, it is possible to avoid the inner peripheral step portion of the seal ring from coming into contact with the end portion or the inclined surface of the inner cylinder. There is an effect that it can be surely fitted and the occurrence of end surface burrs can be suppressed.

  Also, when the lower and upper molds are closed, the vertical (axial) position of the inner peripheral step of the seal ring matches the lower end of the inner cylinder presser (the locking step that is the pressing surface of the inner cylinder). Therefore, the occurrence of end surface burrs can also be more reliably suppressed with this configuration.

  That is, if the inner cylinder step is positioned below (inner cylinder side) the lower end of the inner cylinder presser (locking step part that is the inner cylinder holding surface), the inner cylinder has large dimensional tolerances. In addition, a part of the seal ring can easily ride on the inner cylinder, resulting in occurrence of end surface burrs. On the other hand, if the vertical position of the inner peripheral step portion coincides with the lower end of the inner cylinder presser, the inner cylinder presser holds the inner cylinder at least in the vertical direction (axial direction). Generation of end surface burrs due to riding up can be suppressed.

  On the other hand, when the vertical position of the inner peripheral step portion is positioned above the lower end of the inner cylinder presser (the locking step portion that is the press surface of the inner cylinder), the outer peripheral surface of the inner cylinder presser is exposed accordingly. Therefore, the rubber material (molding material) leaked from the cavity during vulcanization adheres to the outer peripheral surface of the inner cylinder retainer, and the sliding displacement of the inner cylinder retainer in the vertical direction is hindered. In addition, when the vertical position of the inner peripheral stepped portion is positioned above the lower end of the inner cylinder presser, the length of the inner peripheral enlarged portion of the seal ring, i.e., the thinned portion becomes longer. The outer periphery of the upper end of the inner cylinder cannot be tightly fitted, resulting in end face burrs.

  On the other hand, if the vertical position of the inner peripheral step portion is coincident with the lower end of the inner cylinder presser (the locking step portion which is the pressing surface of the inner cylinder), the lower die and the upper die are closed. Since the outer peripheral surface of the inner cylinder presser can be covered with the inner peripheral body portion of the seal ring, it is possible to suppress the rubber material (molding material) from adhering to the outer peripheral surface of the inner cylinder presser and to smooth the inner cylinder presser. A sliding displacement can be ensured.

  In addition, by making the vertical position of the inner peripheral step portion coincide with the lower end of the inner cylinder presser, it is possible to avoid unnecessarily increasing the length of the thin portion of the seal ring (inner peripheral enlarged diameter portion). Since the required minimum length can be obtained, the outer periphery of the upper end of the inner cylinder can be tightly fitted and the occurrence of end surface burrs can be reliably suppressed.

  Further, the gap between the outer peripheral body of the seal ring and the small diameter hole in the nested fitting hole is a range from the lower end surface of the seal ring to the outer peripheral step (that is, the entire area of the outer peripheral body of the seal ring). Range), and the inner peripheral step is positioned closer to the lower end side of the seal ring than the outer peripheral step portion (that is, the nested fitting portion side). There is an effect that it is possible to achieve both close fitting on the outer periphery and smooth sliding displacement in the vertical direction of the inner cylinder presser.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. FIG. 1 is a partial cross-sectional view of a mold 100 according to an embodiment of the present invention, and FIG. 2 is a partial enlarged cross-sectional view of the mold 100. 1 and 2 illustrate a state in which the lower mold 10 and the upper mold 20 are closed and the molding material R is filled in the cavity in which the inner cylinder 210 and the outer cylinder 220 are set.

  The mold 100 is a vulcanization mold for vulcanizing the vibration isolator 200. As shown in FIG. 1, the lower mold 10 and the upper mold 20 that are closed up and down face each other. The anti-vibration device 200 is vulcanized by filling the molding material R into the cavity and vulcanizing it. Here, the vibration isolator 200 which is a molding target of the mold 100 will be described with reference to FIG.

  FIG. 3 is a perspective view of the vibration isolator 200. In the present embodiment, a vibration isolating bush used for a wheel suspension device will be described as an example of a molding target.

  As shown in FIG. 3, the vibration isolator 200 is configured in a cylindrical shape from a steel material, and is configured in a cylindrical shape from a steel material and is concentrically disposed on the outer peripheral side of the inner cylinder 210. The outer cylinder 220 is composed of a rubber-like elastic material, and includes an antivibration base 230 that connects the outer peripheral surface of the inner cylinder 210 and the inner peripheral surface of the outer cylinder 220.

  As shown in FIG. 3, a plurality of sawtooth-shaped (uneven shape) angle grooves 211 are formed on the upper end surface and the lower end surface of the inner cylinder 210 in the axis O direction (vertical direction in FIG. 3). The plurality of chevron grooves 211 are distributed in a radial straight line when viewed in the direction of the axis O. Further, the inner cylinder 210 is configured such that the outer periphery of the upper and lower ends is inclined in a tapered shape.

  Returning to FIG. 1 and FIG. The lower mold 10 is a part configured to be capable of mold closing and mold opening by moving up and down (moving up and down in FIG. 1) with respect to an upper mold 20 which will be described later. Oppositely arranged on the lower side (lower side in FIG. 1). A concave portion 11 having a circular shape when viewed from the front is formed in the upper surface of the lower mold 10 (upper side surface in FIG. 1), and a nested mold 12 is fitted and fixed to the concave portion 11.

  As shown in FIG. 1, the nesting die 12 is a part for forming a cavity for molding the outer shape of the vibration isolation base 230 between the outer peripheral side of the inner cylinder 210 and the inner peripheral side of the outer cylinder 220. Yes, it is arranged at a position opposite to the nested mold 22 in the upper mold 20 described later.

  As described above, the upper mold 20 is a portion configured to be mold-closeable and mold-openable with respect to the lower mold 10, and as shown in FIG. 1, is opposed to the upper side of the lower mold 10 (upper side in FIG. 1). ing. A concave portion 21 having a circular shape when viewed from the front is formed in the lower surface of the upper mold 20 (the lower side surface in FIG. 1). The concave mold 21 includes a nested mold 22 for forming a cavity together with the nested mold 12 described above. It is fitted and fixed.

  As shown in FIG. 1, the nesting molds 12 and 22 are formed with fitting step portions 12c and 22c for holding the outer cylinder 220 concentrically with the inner cylinder 210. As shown in FIG. In a state where the mold 10 and the upper mold 20 are closed, the end surface of the outer cylinder 220 is pressed and held from above and below, and the outer cylinder 220 can be fitted and held.

  In addition, the holding rings 13 and 23 are fixed to the lower mold 10 and the upper mold 20 by bolts (not shown), and the outer cylinder 220 is fitted in the inner peripheral side of the holding rings 13 and 23. It is configured. Thereby, it can suppress that the outer cylinder 220 bulges and deforms at the time of vulcanization molding.

  Further, as shown in FIGS. 1 and 2, the nested molds 12 and 22 include fitted portions 12a and 22a and fitting hole portions 12b and 22b. Here, the fitted portions 12a and 22a and the fitting hole portions 12b and 22b have a common configuration in the nested molds 12 and 22, so the nested mold 22 is taken as an example with reference to FIG. A description of the nested mold 12 is omitted.

  As shown in FIG. 2, the fitted portion 22 a is a portion fitted on the outer periphery of the upper end of the inner cylinder 210, has an inner circumference with a circular cross section, and an inner diameter thereof is slightly smaller than the outer diameter of the inner cylinder 210. Is set to a value.

  As shown in FIG. 2, the fitting hole portion 22 b is a portion that is concentrically connected to the fitted portion 22 a and into which a seal ring 50 described later is fitted, and has a circular inner periphery. ing. The fitting hole portion 22b constitutes a lower portion (lower side in FIG. 2) on the inner peripheral surface of the fitting hole portion 22b and a small-diameter hole portion 22b1 provided continuously to the fitted portion 22a, and the fitting hole portion 22b. And an enlarged-diameter hole 22b2 having an inner diameter set larger than that of the small-diameter hole 22b1. The small-diameter hole 22b1 has a constant inner diameter along the axial direction (the vertical direction in FIG. 2).

  In addition, as above-mentioned, the fitting hole part 12b is a site | part comprised in common with the fitting hole part 22b, While comprising the upper part (FIG. 1 upper side) in the internal peripheral surface of the fitting hole part 12b. A small-diameter hole portion 12b1 (see the small-diameter hole portion 22b1 in FIG. 2) connected to the fitted portion 12a and a lower portion (lower side in FIG. 1) on the inner peripheral surface of the fitting hole portion 12b are formed. And an enlarged diameter hole portion 12b2 (see an enlarged diameter hole portion 22b2 in FIG. 2) whose inner diameter is set to a value larger than 12b1. The small-diameter hole 12b1 has a constant inner diameter along the axial direction (the vertical direction in FIG. 1).

  As shown in FIGS. 1 and 2, the support pin 30 and the inner cylinder presser 40 are disposed so as to protrude upright in the fitting holes 12 b and 22 b through a seal ring 50 described later.

  As shown in FIG. 1, the support pin 30 is a part that is inserted from the lower end (lower side in FIG. 1) opening of the inner cylinder 210 and locks the lower end of the inner cylinder 210, and is inserted into the inner cylinder 210. Insertion pin portion 31, locking step portion 32 formed in a large diameter as a stepped portion that locks the lower end of inner cylinder 210 at the base of insertion pin portion 31, and downward with the locking step portion 32 being the maximum diameter And a conical cone portion 33 having an outer diameter that gradually decreases toward the head.

  As shown in FIG. 1, the holding cylinder 14 is internally fitted and held together with a seal ring 50 described later in the fitting hole 12 b of the insert mold 12. The holding cylinder 14 includes a receiving surface portion 14a that swings a conical inner periphery corresponding to the conical portion 33 of the support pin 30, and the conical portion 33 is received by the receiving surface portion 14a, whereby the support pin 30 is shown in FIG. Hold in place.

  Here, as shown in FIG. 1, the support pin 30 is configured to be displaceable in the axial direction (the vertical direction in FIG. 1) and has an eject pin 34 that extends downward (the lower side in FIG. 1). I have. Between the spring seat (not shown) of the eject pin 34 and the lower mold 10, a return spring SP1 configured as a coil spring is disposed in a state of being elastically compressed and deformed, and this return spring. The support pin 30 is urged downward (lower side in FIG. 1) by the elastic restoring force of SP1, and is held at a fixed position shown in FIG. 1 by the urging force.

  When the anti-vibration base body 200 is punched after vulcanization molding, the eject pin 34 is pushed upward by a pushing means (not shown) upward (upward in FIG. 1) against the urging force of the return spring SP1. By doing so, the outer periphery of the lower end of the inner cylinder 210 can be detached from the fitting portion between the insert mold 12 and the seal ring 50.

  As shown in FIGS. 1 and 2, the inner cylinder retainer 40 is a part that is fitted from the upper end (upper side in FIG. 1) opening of the inner cylinder 210 and locks the upper end of the inner cylinder 210. An insertion pin portion 41 to be inserted, a body portion 42 that is connected to the base portion (upper side in FIG. 2) of the insertion pin portion 41 and has a larger diameter than the insertion pin portion 41, and the body portion 42 and the insertion portion A locking step portion 43 formed between the pin portion 41 and a projecting portion 44 formed to project outward in the radial direction at the upper end (upper side in FIG. 2) of the body portion 42 and concentric with the support pin 30. Are arranged so as to face each other vertically.

  Here, as shown in FIG. 2, the inner cylinder retainer 40 is fitted with a body portion 42 so as to be slidable and displaceable in the axial direction (vertical direction in FIG. 1) with respect to an inner periphery of a seal ring 50 described later. In a predetermined range (that is, between the position where the upper surface of the overhanging portion 44 is in contact with the upper mold 20 and the position where the lower surface of the overhanging portion 43 is in contact with the upper surface of the seal singing 50, see FIG. 5) It is configured to be displaceable in the vertical direction (FIG. 1).

  As shown in FIG. 2, a return spring SP2 configured as a coil spring is disposed between the inner cylinder retainer 40 and the upper mold 20 in a state of being elastically compressed and deformed. The inner cylinder presser 40 is urged downward (lower side in FIG. 2) by the elastic restoring force of SP2.

  As a result, as shown in FIG. 2, in the closed state, the inner cylinder retainer 40 can elastically press and support the inner cylinder 210 while absorbing the dimensional error of the inner cylinder 210. On the other hand, when the anti-vibration base 200 is die-cut after the vulcanization molding, the inner cylinder presser 40 is projected and displaced downward (lower side in FIG. 2) by the urging force of the return spring SP2, so that the inner cylinder The outer periphery of the upper end of 210 can be naturally detached from the fitting portion between the insert mold 22 and the seal ring 50 (see FIG. 5).

  As shown in FIG. 1 or FIG. 2, the seal ring 50 is fitted over the outer periphery of the upper and lower ends of the inner cylinder 210, and holds the holding cylinder 14 so as to hold the inner cylinder 14 or the inner cylinder presser 40 so as to be slidable. It is a member and is internally fitted and held in the fitting holes 12b and 22b of the insert molds 12 and 22. Here, with reference to FIG. 4, the detailed structure of the seal ring 50 is demonstrated.

  4A is a front view of the seal ring 50 viewed from the axial direction, and FIG. 4B is a cross-sectional view of the seal ring 50 taken along the line IVb-IVb in FIG. 4A. Since both the seal rings 50 held by the nested molds 12 and 22 are configured in common, FIG. 4 will be described by taking the seal ring 50 held by the nested mold 22 as an example.

  As shown in FIG. 4, the seal ring 50 is a member configured in a cylindrical shape having an axis O from a mold material and having both ends opened. An outer peripheral enlarged diameter portion 51 and an outer peripheral barrel are provided on the outer peripheral surface side. A portion 52 and an outer peripheral step portion 53 are provided.

  As shown in FIG. 4, the outer peripheral enlarged diameter portion 51 constitutes an upper portion (upper side in FIG. 2) on the outer peripheral surface of the seal ring 50 and is fitted into the enlarged diameter hole portion 22 b 2 in the fitting hole portion 22 b of the insert mold 22. It is a site | part (refer FIG. 2), and is formed as an overhang | projection part which protrudes in the radial direction outward in a flange shape.

  As shown in FIG. 4, the outer peripheral body 52 is a part constituting the lower part (lower side in FIG. 2) of the outer peripheral surface of the seal ring 50, and the outer diameter of the outer peripheral body 52 is that of the outer peripheral enlarged portion 51. It is smaller than the outer diameter and smaller than the inner diameter of the small-diameter hole 22 b 1 in the fitting hole 22 b of the insert mold 22. Thereby, the seal ring 50 has a clearance gap between the small diameter hole 22b1 in the fitting hole 22b of the insert mold 22 (see FIG. 2).

  In addition, the outer periphery trunk | drum 52 has a fixed outer diameter along the axis | shaft O direction. As shown in FIG. 4, the outer peripheral step portion 53 is a step portion located between the outer peripheral enlarged diameter portion 51 and the outer peripheral trunk portion 52, and is configured as a plane orthogonal to the axis O.

  Further, as shown in FIG. 4, the seal ring 50 includes an inner peripheral body portion 54, an inner peripheral enlarged diameter portion 55, and an inner peripheral step portion 56 on the inner peripheral surface side. The inner peripheral body portion 54 constitutes an upper portion (upper side in FIG. 2) on the inner peripheral surface of the seal ring 50, and is a portion in which the inner cylinder presser 40 is fitted so as to be slidable in the vertical direction (see FIG. 2). The inner diameter is configured to be constant along the axis O.

  As shown in FIG. 4, the inner peripheral enlarged diameter portion 55 constitutes a lower portion (lower side in FIG. 2) on the inner peripheral surface of the seal ring 50 and is a portion fitted on the upper outer periphery of the inner cylinder 210 ( The inner diameter of the inner peripheral enlarged diameter portion 55 is made larger than the inner diameter of the inner peripheral trunk portion 54.

  The inner peripheral step portion 56 is a step portion located between the inner peripheral trunk portion 54 and the inner peripheral enlarged diameter portion 55 and is configured as a plane orthogonal to the axis O. In the present embodiment, the difference between the inner diameter of the inner peripheral body portion 54 and the inner diameter of the inner peripheral enlarged diameter portion 55 is 1.0 mm, and the width of the inner peripheral step portion 56 (the vertical dimension in FIG. 4 (b)). It is set to 0.5 mm.

  Here, in the seal ring 50, the length in the axis O direction of the outer peripheral enlarged diameter portion 51 (the length in the left-right direction in FIG. 4B) is sufficiently shorter than the length in the axis O direction of the outer peripheral trunk portion 52, and The length of the inner peripheral enlarged diameter portion 55 in the axis O direction is sufficiently shorter than the length of the inner peripheral trunk portion 54 in the axis O direction. Thus, as will be described later, the effect of suppressing the occurrence of end surface burrs by tightly fitting the outer periphery of the upper end of the inner cylinder 210, the effect of suppressing wear of the seal ring 50 and extending the replacement cycle, and the seal The effect of improving the workability by easily removing the inner cylinder 210 from the ring 50 and the effect of smoothly sliding the inner cylinder presser 40 in the vertical direction can be surely exhibited.

  Note that the length in the axis O direction described above is set such that the outer peripheral enlarged diameter portion 51 is set to a length within a range of 20% to 30% with respect to the outer peripheral trunk portion 52, and the inner peripheral enlarged diameter portion 55 is the inner peripheral trunk portion. 54 is preferably set to a length in the range of 20% to 30%. In the present embodiment, all of the above ranges are set to 25%. Therefore, the region where the outer peripheral body portion 52 and the inner peripheral body portion 54 overlap with each other when viewed in the direction perpendicular to the axis O is 50% of the entire length in the axis O direction.

  Returning to FIG. 1 and FIG. As described above, since the molding ring 100 is configured so that the inner peripheral step portion 56 is positioned between the inner peripheral body portion 54 and the inner peripheral enlarged diameter portion 55, the inner peripheral step portion is formed. 56 (that is, the end surface of a cylindrical extraction jig having a diameter smaller than the inner diameter of the inner peripheral enlarged diameter portion 55 and larger than the inner diameter of the inner peripheral barrel portion 54 is engaged with the inner peripheral step portion 56. For example, the seal ring 50 can be pushed upward (upper side in FIG. 2). That is, since the seal ring 50 can be easily extracted from the insert mold 22, it is possible to improve the workability in replacement work of the seal ring 50 that is required periodically.

  In addition, as described above, the mold 100 is configured such that a gap is formed between the small diameter hole 22b1 in the fitting hole 22b of the insert mold 22 and the outer peripheral body 52 of the seal ring 50. It is possible to extend the replacement cycle by suppressing wear of the seal ring 50 while tightly fitting the outer periphery of the upper end of the tube 210 to suppress the occurrence of end surface burrs, and the inner tube 210 is removed from the seal ring 50. It is easy to improve workability.

  In other words, in the configuration having no gap, when the inner diameter of the seal ring is given a margin with respect to the outer diameter of the inner cylinder 210 (tightening margin is reduced), the outer periphery of the upper end of the inner cylinder 210 is tightly covered by the seal ring. It cannot be fitted, causing end surface burrs. On the other hand, if the inner diameter of the seal ring is made too small with respect to the outer diameter of the inner cylinder 210 (the tightening margin is increased), the outer periphery of the upper end of the inner cylinder 210 is too tightly fitted by the seal ring, so that the seal ring is worn. This shortens the exchange cycle and makes it difficult for the inner cylinder 210 to be detached from the seal ring when the mold is opened (see FIG. 5), resulting in a decrease in workability.

  On the other hand, according to the present invention, as shown in FIG. 2, in the state where the outer peripheral enlarged diameter portion 51 of the seal ring 50 is fitted in the enlarged diameter hole portion 22 b 2 in the fitting hole portion 22 b of the nested mold 22. Since the gap is formed between the small-diameter hole 22b1 in the fitting hole 22b of the insert mold 22 and the outer peripheral body 52 of the seal ring 50, the diameter of the seal ring 50 can be easily increased elastically. it can.

  Therefore, even when the inner diameter of the seal ring 50 (inner peripheral enlarged portion 55) is sufficiently small (increase the tightening margin) with respect to the outer diameter of the inner cylinder 210 to suppress the generation of end surface burrs, the seal ring 50 The wear cycle can be suppressed and the replacement cycle can be extended, and the inner cylinder 210 can be easily removed from the seal ring 50 when the mold is opened (see FIG. 5), thereby improving workability.

  Further, since only the outer peripheral enlarged diameter portion 51 of the seal ring 50 is fitted into the enlarged diameter hole portion 22b2 in the fitting hole portion 22b of the nested mold 22, when the seal ring 50 is extracted from the nested mold 22, Such a seal ring 50 can be pushed upward to facilitate removal from the insert mold 22.

  Here, as shown in FIG. 2, the molding die 100 has an inner diameter of the enlarged hole portion 22b2 larger than that of the smaller diameter hole portion 22b1 in the fitting hole portion 22b of the insert die 22, and a seal ring. 50, the outer diameter of the outer peripheral enlarged diameter portion 51 is configured to be larger than the outer diameter of the outer peripheral trunk portion 52.

  By configuring in this way, the upper end outer periphery of the inner cylinder 210 is made to be opposite to the case where these relationships are reversed (for example, the inner diameter of the enlarged diameter hole portion 22b2 is smaller than the inner diameter of the smaller diameter hole portion 22b1). It is possible to extend the replacement cycle by suppressing the wear of the seal ring 50 while suppressing the generation of end surface burrs by tightly fitting, and the inner cylinder 210 can be easily removed from the seal ring 50 to improve workability. Improvements can be made. Further, the inner cylinder presser 40 can be smoothly moved without obstructing the sliding displacement in the vertical direction.

  Here, as shown in FIG. 2, the mold 100 is configured such that the inner diameter of the inner peripheral barrel portion 54 of the seal ring 50 is larger than the outer diameter (the outer diameter on the upper side in FIG. 2) at the upper end (tip) of the inner cylinder 210. Therefore, in the mold closed state shown in FIG. 2, only the inner cylinder presser 40 can be in a state of pressing the upper end of the inner cylinder 210 in the axial direction, and the inner peripheral step portion 56 of the seal ring 50 is in the inner cylinder 210. Contact with the upper end or the inclined surface can be avoided.

  That is, when the dimensional tolerance of the inner cylinder 210 is large, when the mold shown in FIG. 2 is closed, for example, with respect to the upper end surface (upper side surface in FIG. 2) of the inner cylinder 210 or the tapered inclined surface, The peripheral step 56 or the ridge line portion between the inner peripheral step 56 and the inner peripheral body 54 may ride up and the seal ring 50 may be radially expanded. In this case, the seal ring 50 cannot tightly fit the outer periphery of the upper end of the inner cylinder 210, leading to the generation of end surface burrs.

  On the other hand, according to this invention, it can avoid that the inner peripheral step part 56 and the said ridgeline part of the seal ring 50 contact the upper end or inclined surface of the inner cylinder 210 by setting it as the above-mentioned structure. Therefore, the outer periphery of the upper end of the inner cylinder 210 can be securely fitted and the occurrence of end surface burrs can be suppressed.

  Here, as shown in FIG. 2, the molding die 100 is positioned in the vertical direction of the inner peripheral step portion 56 of the seal ring 50 (the vertical direction position in FIG. 2) when the lower die 10 and the upper die 20 are closed. ) Is matched with the lower end of the inner cylinder presser 40, so that the generation of end surface burrs can also be more reliably suppressed by this configuration.

  That is, if the vertical position (the vertical position in FIG. 2) of the inner peripheral step portion 56 is positioned below (the lower side in FIG. 2) below the lower end of the inner cylinder presser 40, the dimensional tolerance of the inner cylinder 210 is large. A part of the seal ring 50 can easily ride on the inner cylinder 210, causing the occurrence of end surface burrs. On the other hand, if the vertical position of the inner peripheral step portion 56 coincides with the lower end of the inner cylinder presser 40, the inner cylinder presser 40 presses the inner cylinder at least in the vertical direction. It is possible to suppress the generation of end surface burrs caused by riding on

  On the other hand, when the vertical position (the vertical position in FIG. 2) of the inner peripheral step portion 56 is positioned above the lower end of the inner cylinder presser 40 (upper side in FIG. 2), the inner cylinder presser 40 (the barrel part 42) correspondingly. Since the outer peripheral surface of the inner cylinder retainer 40 is exposed, the molding material R leaked from the cavity during vulcanization adheres to the outer peripheral surface of the inner cylinder retainer 40, and the sliding displacement of the inner cylinder retainer 40 in the vertical direction is hindered. Further, when the vertical position of the inner peripheral step portion 56 is positioned above the lower end of the inner cylinder presser 40, the length of the inner peripheral enlarged diameter portion 55 of the seal ring 50, that is, the thinned portion, is correspondingly increased. Since it becomes long, the outer periphery of the upper end of the inner cylinder 210 cannot be tightly fitted, and an end surface burr is generated.

  On the other hand, as shown in FIG. 2, if the vertical position (the vertical position in FIG. 2) of the inner peripheral step portion 56 coincides with the lower end of the inner cylinder presser 40, in the mold closing state shown in FIG. Since the outer peripheral surface of the inner cylinder retainer 40 (body portion 42) can be covered with the inner peripheral body portion 54 of the seal ring 50, the adhesion of the molding material R to the outer peripheral surface of the inner cylinder retainer 40 is suppressed, A smooth sliding displacement of the tube presser 40 can be ensured.

  In addition, the length of the inner ring step portion 56 (inner peripheral enlarged diameter portion 55) is reduced by matching the vertical position (the vertical position in FIG. 2) of the inner peripheral step portion 56 with the lower end of the inner cylinder presser 40. Can be prevented from becoming unnecessarily long, and the required minimum length can be achieved, so that the outer periphery of the upper end of the inner cylinder 210 can be tightly fitted to reliably suppress the occurrence of end surface burrs. .

  Note that “the vertical position of the inner peripheral step portion 56 of the seal ring 50 and the lower end of the inner cylinder presser 40 coincides” described in claim 2 means that the axial length of the inner cylinder 210 is within the tolerance range. It is sufficient if it is equal to the target median value, and the dimensional error (tolerance) of the axial length of the inner cylinder 210 due to the elastic support (vertical sliding displacement) of the inner cylinder presser 40 by the return spring SP2 When the inner cylinder presser 40 is slidably displaced in the vertical direction (the vertical direction in FIG. 2) from the position at the target median value, the vertical position is matched. It is not the purpose to request.

  Here, in the mold 100, the gap between the outer peripheral body portion 52 of the seal ring 50 and the small-diameter hole portion 22b1 in the fitting hole portion 22b of the insert die 22 is the lower end surface of the seal ring 50 (lower side in FIG. 2). Since the inner peripheral step portion 56 is located on the lower end side (lower side in FIG. 2) of the seal ring 50 with respect to the outer peripheral step portion 53. In addition, it is possible to achieve both the close fitting on the outer periphery of the upper end of the inner cylinder 210 and the smooth sliding displacement of the inner cylinder presser 40 in the vertical direction.

  As shown in FIG. 1, a runner block 80 that can be separated from the upper mold 20 when the mold is opened is mounted on the upper surface (the upper side surface of FIG. 1) of the upper mold 20. The molding die 100 vertically penetrates the runner groove 61 for injection formed on the joint surface between the runner block 80 and the upper die 20, the constricted gate 62 connected to the cavity, the upper die 20 and the nested die 22. An injection path 60 for injecting the molding material R into the cavity is formed by the injection hole 63 connecting the gate 62 and the injection runner groove 61.

  As shown in FIG. 1, the mold 100 includes a relief runner groove 71 formed on the joint surface between the runner block 80 and the upper mold 20, a constricted gate 72 connected to the cavity, and an upper mold. 20 and the nesting die 22 are formed in the vertical direction to form a discharge path 70 for discharging the air in the cavity and the molding material R to the outside by the release hole 73 connecting the gate 62 and the escape runner groove 71. Has been.

  When the vibration isolator 200 (see FIG. 3) is vulcanized by the mold 100, the inner cylinder 210 and the outer cylinder 220 are first set in the mold in the mold open state in which the upper side 20 is separated from the lower mold 10. To do. That is, the inner cylinder 210 is inserted into the support pin 30 protruding from the lower mold 10, the lower end of the inner cylinder 210 is fitted with the seal ring 50, and the lower end of the inner cylinder 210 is locked to the holding cylinder 14, The inner cylinder 210 is supported in an upright state. Further, the outer cylinder 220 is set by being fitted to the fitting step portion 12 c of the nested mold 12.

  Next, the upper die 20 is lowered, and the lower die 10 and the upper die 20 are closed, and along with this, as shown in FIG. And the engaging step 43 of the inner cylinder retainer 40 engages the upper end of the inner cylinder 210 to press and hold the inner cylinder 210. At the same time, as shown in FIG. 1, the fitting step 22 c of the insert mold 22 is fitted to the upper end of the outer cylinder 220.

  Then, when the molding material R is injected into the cavity through the injection path 60 described above, the molding material R flows around the both sides of the inner cylinder 210 toward the discharge path 70, As shown in FIG. 1, while being discharged from the discharge path 70, the cavity is filled, so that vulcanization molding is performed while maintaining a predetermined filling pressure.

  After vulcanization molding, the mold is opened, unnecessary portions are separated from the gates 62 and 72, and the vibration isolator 200 (see FIG. 3) as a molded product is extracted from the molding die 100. In this case, as described above, the support pin 30 is pushed upward by the eject pin 34 (upper side in FIG. 1), so that the outer periphery of the lower end of the inner cylinder 210 is expanded to the inner periphery of the fitting portion 12a of the nested mold 12 and the seal ring 50. It can be easily detached from the diameter portion 55.

  Similarly, as the mold opens, the inner cylinder retainer 40 projects and displaces downward (lower side in FIG. 1) by the urging force of the return spring SP2, so that the outer periphery of the upper end of the inner cylinder 210 is inserted into the nested mold 22. The fitting portion 22a and the fitting portion of the seal ring 50 with the inner peripheral enlarged diameter portion 55 can be naturally separated (see FIG. 5).

  The present invention has been described above based on the embodiments. However, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed.

  The numerical values (for example, the quantity, size, angle, etc. of each component) given in the above embodiments are examples, and other numerical values can naturally be adopted.

  In the above-described embodiment, the case where the vibration isolation base 200 is configured to include the outer cylinder 220 has been described. However, the present invention is not necessarily limited thereto, and the vibration isolation base 200 is configured without the outer cylinder 220. May be.

  Although not described in the above embodiment, the axial length (vertical length in FIG. 2) of the seal ring 50 is shorter than the recessed depth (vertical length in FIG. 2) of the fitting hole 22b. Is preferred. That is, as shown in FIG. 2, the outer peripheral enlarged diameter portion 51 of the seal ring 50 is fitted into the enlarged diameter hole portion 22 b 2, and the outer peripheral enlarged diameter portion 51 is held between the insert mold 22 and the upper mold 20. In this state, a gap is preferably formed between the lower end of the seal ring 50 (lower side in FIG. 2) and the bottom surface of the fitting hole 22b (upper surface of the fitted portion 22a).

  As a result, the outer circumference of the inner cylinder 210 is tightly fitted to suppress the occurrence of end surface burrs, while the wear of the seal ring 50 can be suppressed and the replacement cycle can be extended. This is because the cylinder 210 can be easily pulled out and workability can be improved, and the inner cylinder presser 40 can be smoothly moved without obstructing the sliding displacement in the vertical direction.

It is a fragmentary sectional view of the shaping | molding die in one embodiment of this invention. It is a partial expanded sectional view of a shaping | molding die. It is a perspective view of a vibration isolator. (A) is the front view which looked at the seal ring from the axial direction, (b) is sectional drawing of the vibration isolator in the IVb-IVb line | wire of Fig.4 (a). It is a partial expanded sectional view of a shaping | molding die, and illustrates the state at the time of mold opening.

Explanation of symbols

100 Molding die 10 Lower die 12 Nesting die 12a Fitting portion 12b Fitting hole portion 12b1 Small diameter hole portion 12b2 Large diameter hole portion 20 Upper die 22 Nesting die 22a Fitting portion 22b Fitting hole portion 22b1 Small diameter hole portion 22b2 Large diameter hole Portion 30 Support pin 40 Inner cylinder retainer 50 Seal ring 51 Outer diameter enlarged portion 52 Outer circumference barrel portion 53 Outer circumference step portion 54 Inner circumference barrel portion 55 Inner circumference enlarged portion 56 Inner circumference step portion 200 Vibration isolator 210 Inner cylinder 230 Vibration isolation base

Claims (2)

A mold for vulcanizing and molding a vibration-proof device having at least a vibration-proof base composed of a rubber-like elastic material and a cylindrical inner cylinder to which the vibration-proof base is vulcanized and bonded,
A lower mold and an upper mold that are positioned opposite to each other and mold the outer shape of the vibration-proof base and are closed up and down, and a lower end opening of the inner cylinder that is installed in the nested mold A support pin that is inserted and locks the lower end of the inner cylinder; and an inner cylinder presser that is concentrically opposed to the support pin and that locks the upper end of the inner cylinder;
In a state where the lower mold and the upper mold are closed, a cavity is formed by the insert mold on the outer peripheral side of the inner cylinder supported by the support pin and the inner cylinder presser, and a rubber-like elastic material is formed in the cavity. In a mold that is filled with a molding material and vulcanized and molded integrally with the inner cylinder,
It has a cylindrical seal ring,
The nesting type includes a fitting portion fitted on the outer periphery of the end portion of the inner cylinder, and a fitting hole portion concentrically connected to the fitting portion and fitted with the seal ring.
The nested fitting hole includes a small-diameter hole connected to the fitted part, an enlarged-diameter hole connected to the small-diameter hole and having an inner diameter larger than that of the small-diameter hole, With
The seal ring constitutes the outer peripheral surface of the seal ring and the outer peripheral enlarged diameter portion fitted in the enlarged diameter hole portion of the nested fitting hole portion, and the outer peripheral surface of the seal ring and the An outer diameter that is smaller than the outer peripheral enlarged diameter portion and has a gap between the inner diameter fitting hole and the smaller diameter hole, and is located between the outer peripheral enlarged diameter portion and the outer peripheral trunk. An outer peripheral step portion, an inner peripheral surface of the seal ring, an inner peripheral body portion in which the inner cylinder presser is fitted so as to be slidable in the vertical direction, an inner peripheral surface of the seal ring and the inner surface An inner peripheral enlarged diameter portion that has an inner diameter larger than that of the peripheral barrel portion and is fitted on the outer periphery of the end portion of the inner cylinder, and an inner peripheral step portion positioned between the inner peripheral enlarged diameter portion and the inner peripheral barrel portion. A mold characterized by having The inner cylinder is configured such that the upper and lower end surfaces are formed in a saw-toothed uneven shape, and the upper and lower end outer periphery is configured in a tapered shape,
The seal ring has an inner diameter of the inner peripheral body portion larger than an outer diameter of the tapered upper and lower ends of the inner cylinder, and the vertical direction of the inner peripheral step portion in a state where the lower mold and the upper mold are closed. The position is matched with the lower end of the inner cylinder presser,
A gap between the outer peripheral body portion of the seal ring and the small diameter hole portion in the nested fitting hole portion is continuously formed over the entire range in the outer peripheral body portion of the seal ring, and the inner peripheral stage 2. The mold according to claim 1, wherein the portion is positioned closer to the fitting portion of the nested mold than the outer peripheral stepped portion.

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