JP4040985B2 - Non-slip processing method for metal end face of rubber member with metal fitting, and vulcanization mold used therefor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an anti-slip processing method for a metal end face of a vibration-proof bushing or other rubber member with a metal fitting used for an automobile suspension or the like, and a vulcanization mold used therefor.
[0002]
[Prior art]
For example, in a suspension of a vehicle such as an automobile, an anti-vibration device such as an anti-vibration bush that is used between a member on the vehicle body side and a member member such as a suspension is shown in FIGS. 5 and 6, for example. As described above, a rubber member with metal fittings having a cylindrical metal fitting 1 as an attachment member attached to a member on the vehicle body side and a rubber portion 2 as a vibration-proof base bonded to the outer periphery of the cylindrical metal fitting 1 by vulcanization. A is known. There is also known a rubber member with metal fittings of a type in which an outer cylinder metal fitting is vulcanized and bonded to the outer periphery of the rubber part 2 (not shown).
[0003]
In the state of use of the rubber member A with metal fittings, as shown in FIG. 7, a mounting bolt 50 is inserted into the cylindrical metal fitting 1, and the cylindrical metal fitting 1 is inserted into the plate-like members 51, 51 on the vehicle body side. It is attached and fixed in a state where both end surfaces of the abutment are in contact. Further, the rubber part 2 or an outer cylinder fitting vulcanized and bonded to the outer periphery thereof is press-fitted into the collar 52 and fixed to a member member 53 such as a suspension.
[0004]
By the way, in the above assembly state to the vehicle, for the purpose of stabilizing the mounting and fixing to the members 51, 51 on the vehicle body side with which the end surface of the tubular bracket 1 abuts, both end surfaces of the tubular bracket 1 As shown in FIG. 5 and FIG. 6, anti-slip processing by unevenness such as serration 3 is performed (see Patent Document 1 below).
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-22770 (FIGS. 7-9)
[0006]
[Problems to be solved by the invention]
Conventionally, as a method of applying anti-slip processing such as serration 3 to the metal end surface of the rubber member A with metal fittings, a long pipe material is used as a cylindrical metal fitting with the rubber member A with metal fittings such as a vibration-proof bushing. After cutting into lengths according to the use as 1, set each cylindrical fitting 1 on a processing machine, press the cutting tool against the end face of the cylindrical fitting, and apply irregularities such as serrations It was.
[0007]
In this case, in the manufacture of rubber members with metal fittings, an independent process for processing serration etc. is required for each cut cylindrical metal fitting, which not only leads to an increase in manufacturing process, but also the amount of stock of the cylindrical metal fittings However, the rubber member with a metal fitting subjected to the above-described anti-slip processing is expensive.
[0008]
The present invention has been made in view of the above, and in the manufacture of a rubber member with a metal fitting in which the end surface of the cylindrical metal fitting is subjected to anti-slip processing such as serration, By simultaneously performing the vulcanization molding process, it is possible to eliminate the need for an anti-slip process, reduce the amount of cylindrical metal fittings, increase productivity, and contribute to cost reduction. The present invention provides a processing method, and further provides a vulcanization mold that can be suitably used for carrying out the processing method.
[0009]
[Means for Solving the Problems]
One aspect of the present invention that solves the above-described problems is a rubber member with a metal fitting that includes a cylindrical metal fitting as a mounting member and a rubber portion that is vulcanized and bonded to the outer periphery thereof. In the step of setting the cylindrical metal fitting in the vulcanization mold and vulcanizing and molding the rubber part, in contact with the end face of the cylindrical metal fitting in the vulcanization mold An anti-slip blade is provided on the part, and by closing the vulcanizing mold, the end surface of the cylindrical metal fitting set in the mold is pressed in the axial direction by the blade that abuts the end. Then, it is characterized in that the end surface is subjected to a process of making irregularities with a blade portion.
[0010]
According to the present invention, in the vulcanization molding process of the rubber part, when the mold is closed in a state where the cylindrical fitting cut into a predetermined length is set in the vulcanization mold, the inside of the vulcanization mold The end surface of the cylindrical metal fitting is pressed by a non-slip cutting blade provided at a contact portion with the cylindrical metal fitting end surface, and the pressing force for closing the mold is used to press the end surface of the cylindrical metal fitting. Irregularities are formed by the blade portion. In this way, the rubber material is injected and vulcanized with the mold completely closed. Thereby, in the process of vulcanization molding, the anti-slip process by the unevenness | corrugation corresponding to the shape of the said blade part can be simultaneously given to the end surface of a cylindrical metal fitting.
[0011]
In the processing method, by providing a blade portion for anti-slip processing at each of the contact portions with the both ends of the cylindrical metal fitting in the vulcanization mold, the mold is closed by closing the mold of the vulcanization mold. The both ends of the metal fitting can be processed to have irregularities by biting of the blade portion.
[0012]
Note that the anti-slip process is preferably a process of forming serrations in which crests and troughs are alternately continuous in the circumferential direction of the end surface of the cylindrical metal fitting, so that the mold can be closed in the vulcanization molding process. Therefore, it is possible to easily apply the anti-slip process by serration to the end face of the cylindrical metal fitting without any particular trouble.
[0013]
According to another aspect of the present invention, there is provided a rubber member with a metal fitting having a cylindrical metal fitting as a mounting member and a rubber portion vulcanized and bonded to the outer periphery thereof, and slips on an end surface of the cylindrical metal fitting. A vulcanizing mold used in a method for performing a stoppering process, comprising an upper mold and a lower mold that can be closed opposite to each other in the vertical direction, and supporting both ends of the cylindrical metal fittings on the upper and lower molds, respectively. A non-slip cutting blade portion that is inserted into the end face of the cylindrical metal fitting when the mold is closed at a contact portion of at least one of the two support bodies with the end face of the cylindrical metal fitting. It is characterized by. By using this vulcanization mold, the above-described anti-slip processing method can be suitably carried out.
[0014]
In the vulcanization mold, the upper and lower support bodies have an annular stepped surface portion that abuts on the end surface of the cylindrical metal fitting on the outer periphery of the base of the support pin portion that fits into both ends of the cylindrical metal fitting when the mold is closed. In addition, a blade portion for preventing slipping may be formed on the stepped surface portion. Thus, by inserting the support pin portions of the support body into both ends of the cylindrical metal fitting set in the vulcanizing mold, the cylindrical metal fitting can be stably held at a predetermined set position, and the mold is closed. In this case, the anti-slip cutting blade portion formed on the annular stepped surface portion provided on the outer periphery of the base portion of the support pin portion can be accurately brought into contact with the end surface of the cylindrical metal fitting without distortion. Further, anti-slip processing such as serration by the blade portion can be reliably performed.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described based on examples shown in the drawings.
[0016]
FIG. 1 is a cross-sectional view at the time of vulcanization showing the outline of a vulcanization mold used in the practice of the present invention, FIG. 2 is a cross-sectional view of the main part before closing the mold of the vulcanization mold, and FIG. FIG. 4 is a perspective view showing an outline of one of the upper and lower supports in the vulcanization mold. FIG. 5 and 6 show an example of the rubber member A with a metal fitting which is a product to be processed of the present invention.
[0017]
A rubber member A with metal fittings shown in FIGS. 5 and 6 has a cylindrical metal fitting 1 as an attachment member for a counterpart member such as a vehicle body frame, and a rubber portion 2 as a vibration-proof base vulcanized and bonded to the outer periphery thereof. Thus, a structure in which serrations 3 for preventing slippage are formed on both end faces of the cylindrical metal fitting 1 is shown. Reference numerals 3a and 3b denote a peak portion and a valley portion of the serration 3, respectively. The height difference between the peak 3a and the valley 3b of the serration 3 is usually about 0.3 to 0.7 mm. In addition, the said cylindrical metal fitting 1 consists of what cut | disconnected the long metal pipe which consists of "carbon steel pipe for machine structures" STKM15C etc. to predetermined length, for example.
[0018]
First, the vulcanization mold 10 used in the method of the present invention in which the end face of the cylindrical metal fitting 1 of the rubber member A with metal fittings is subjected to anti-slip processing will be described.
[0019]
As shown in FIGS. 1 to 3, the vulcanization mold 10 includes an upper mold 11 and a lower mold 12 which are vertically opposed to each other and can be closed with an intermediate mold 13 interposed therebetween, and a predetermined press device. When the mold is closed (not shown), the upper mold 11, the lower mold 12, and the middle mold 13 form a molding cavity 14 on the outside of the cylindrical fitting 1 set in the vulcanizing mold 10. It comes to form. A plurality of such cavity components 15 are usually arranged in parallel in one mold as shown in FIG.
[0020]
Reference numeral 16 in FIG. 1 denotes a runner plate, which is provided so that a rubber material injected into one injection port 17 from an injection machine (not shown) can be injected into the cavity 14 through a runner groove 18a and an injection hole 18b. ing. Reference numeral 19 denotes a base plate.
[0021]
The upper mold 11 and the lower mold 12 respectively have molding surface portions 21 and 22 for molding the end surface in the axial direction of the rubber portion 2 of the rubber member A with the metal fitting, opposite to each other in the cavity constituting portion 15. Yes. In the case of the figure, the molding surface portions 21 and 22 are formed by nesting dies 27 and 28 which are fitted and fixed in the recesses of the upper die 11 and the lower die 12.
[0022]
Support bodies 23 and 24 having support pin portions 23a and 24a protruding downward or upward are provided at the centers (axial center portions) of the molding surface portions 21 and 22, respectively. As shown in the figure, the upper and lower support members 23 and 24 support the cylindrical metal fitting 1 set in the cavity 14 at the predetermined positions by fitting the support pin portions 23a and 24a at both upper and lower ends thereof. It can be done.
[0023]
The both support bodies 23 and 24 are provided with annular step surface portions 25 and 26 which are contact portions with respect to the end surface of the cylindrical metal fitting 1 on the outer circumferences of the base portions of the support pin portions 23a and 24a, respectively. 25 and 26 are provided with anti-slip blade portions 30 and 30 which are in a state of being bitten with respect to the end surface of the cylindrical metal fitting 1 when the mold is closed, respectively.
[0024]
In the case of the figure, as the blade portion 30, as shown in FIG. 4, the concave-convex shape corresponding to the serration 3 of the metal fitting end surface of the metal member with metal fittings A of FIG. 5 and FIG. Concave portions 30a and convex portions 30b having shapes corresponding to the portions 3b are alternately and continuously formed in the circumferential direction. The amount of biting of the blade portion 30 with respect to the end surface of the cylindrical metal fitting in the mold closed state is set according to the height difference between the crest portion 3a and the trough portion 3b of the serration 3.
[0025]
The blade portion 30 is normally attached to the stepped surface portions 25 and 26 integrally with a material other than the support members 23 and 24, for example, a material made of a hardened material such as high-speed tool steel SKH57. In addition, the blade portion 30 can be formed integrally with the support members 23 and 24. In this case, it is desirable to form the whole of the supports 23 and 24 with the same quenched material as described above.
[0026]
The middle mold 13 has an opening 31 at the center, and is provided so that the outer periphery of the cavity 14 is defined between the upper and lower molds 11 and 12, and the outer periphery of the rubber part 2 of the rubber member A with metal fittings can be molded. It has been. In the case of vulcanization molding of a rubber member with a metal fitting having an outer cylinder fitting, the rubber member is provided so as to surround the outer circumference of the outer cylinder fitting set on the outer circumference of the cavity 14.
[0027]
In addition, about the other structure required for the vulcanization molding of the said vulcanization metal mold | die 10, since the structure similar to the past can be utilized, the description is abbreviate | omitted.
[0028]
In the vulcanization molding step including the vulcanization mold 10 including the above-described configuration, the rubber member A with a metal fitting shown in FIGS. 5 and 6 is vulcanized and molded, and the end face of the cylindrical metal fitting 1 is subjected to a non-slip process. The operation and action will be described.
[0029]
First, the cylindrical metal fitting 1 having a predetermined length is set in the cavity 14 with the vulcanizing mold 10 opened. That is, as shown in FIG. 2, the cylindrical metal fitting 1 is fitted to the support pin portion 24 a of the support 24 provided in the lower mold 12 in the axial center portion of the cavity 14, and the lower end surface of the cylindrical metal fitting 1 is The support pin portion 24a is supported in an upright state by contacting the stepped surface portion 26 provided on the outer periphery of the base portion.
[0030]
Next, the upper die 11 is lowered by the operation of a predetermined pressing device, and the die is closed as shown in FIG. 3 with the middle die 13 sandwiched between the upper die 11 and the lower die 12. As a result of this mold closing action, the support pin portion 23a of the support 23 of the upper mold 11 is fitted into the upper end portion of the cylindrical metal fitting 1, and the stepped surface portion 25 on the outer periphery of the base is the upper end surface of the cylindrical metal fitting 1. Abut. In this state, when the mold closing operation further proceeds, the anti-slip blades 30 and 30 set on the stepped surface portions 25 and 26 of the upper and lower supports 23 and 24 are respectively formed into the cylindrical shape. The upper and lower end surfaces of the metal fitting 1 are pressed in the axial direction, and the blade portions 30 and 30 are not easily inserted into the end face of the cylindrical metal fitting 1 by using a press pressure for closing the mold (usually 2500 kgf / cm ² or more). Do not give unevenness. For example, the crests 3a and the troughs 3b corresponding to the concave portions 30a and the convex portions 30b of the blade portions 30 and 30 are alternately and continuously formed in the circumferential direction on the end surface of the cylindrical metal fitting.
[0031]
With the mold completely closed in this way, the rubber material is injected and the rubber part 2 is vulcanized and molded as in the conventional case.
[0032]
Thus, in the vulcanization molding step, the end face of the cylindrical metal fitting 1 can be simultaneously subjected to anti-slip processing by the serration 3 corresponding to the shape of the blade portion 30, and the rubber with the metal fitting shown in FIGS. The member A can be obtained. Therefore, a process for anti-slip processing becomes unnecessary, and the production efficiency of this type of rubber member can be increased.
[0033]
In the above-described embodiment, the case where the anti-slip processing by the serration 3 is performed on both end surfaces of the cylindrical metal fitting 1 is shown, but the anti-slip processing by the same serration may be applied only to one end surface of the cylindrical metal fitting 1. it can. Further, non-slip processing other than serration, for example, anti-slip processing using knurled irregularities, or anti-slip processing using a large number of small convex portions or small concave portions can be performed. In any case, the portion that comes into contact with the end face of the cylindrical metal fitting is provided with a non-slip cutting blade portion corresponding to the form, and is made uneven by utilizing the mold closing action as described above. In addition, in terms of the processing operation of applying unevenness using the mold closing operation, the anti-slip processing by serration in the illustrated embodiment is particularly preferable because the shape is stable and can be processed reliably.
[0034]
【The invention's effect】
As described above, according to the processing method of the present invention, in the production of a rubber member with a metal fitting, an anti-slip process such as serration of the end surface of the cylindrical metal fitting is performed in a vulcanization molding process for molding with a vulcanization mold. This makes it possible to use the mold closing action of the mold, eliminating the need for a non-slip process, reducing the work man-hours for this process, and reducing the amount of stock of cylindrical fittings. This can greatly contribute to the improvement of productivity and cost reduction of this type of rubber member with metal fittings.
[0035]
In particular, by using the vulcanization mold of the present invention, the anti-slip process in the vulcanization molding process can be easily performed without any problem as described above.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view at the time of vulcanization showing an outline of a vulcanization mold used in the practice of the present invention.
FIG. 2 is a cross-sectional view of a main part of the above vulcanization mold before closing.
FIG. 3 is a cross-sectional view of the main part of the vulcanization mold in the closed state.
FIG. 4 is a perspective view schematically showing one of upper and lower supports in a vulcanization mold.
FIG. 5 is a cross-sectional view showing an example of a rubber member with a metal fitting, which is a product to be processed according to the present invention.
FIG. 6 is a plan view of the rubber member with a metal fitting according to the same.
FIG. 7 is a cross-sectional view showing a usage state of a rubber member with a metal fitting.
[Explanation of symbols]
A Rubber member with metal fitting 1 Tubular metal fitting 2 Rubber part 3 Serration 3a Mountain part 3b Valley part 10 Vulcanization mold 11 Upper mold 12 Lower mold 13 Middle mold 14 Cavity 15 Cavity component 16 Runner plate 17 Injection port 18a Runner groove 18b Injection Hole 19 Base plate 21, 22 Molding surface portion 23, 24 Support body 23 a, 24 a Support pin portion 25, 26 Step surface portion 30, 30 Blade portion 30 a for anti-slip processing Depression 30 b Convex portion

Claims (5)

In a rubber member with a metal fitting having a cylindrical metal fitting as an attachment member and a rubber part vulcanized and bonded to the outer periphery thereof, a method of applying an anti-slip process to the end face of the cylindrical metal fitting,
In the step of setting the cylindrical metal fitting in the vulcanization mold and vulcanizing and molding the rubber part, a blade part for anti-slip processing is provided at the contact portion with the end face of the cylindrical metal fitting in the vulcanization mold. By closing the mold of the vulcanization mold, the end surface of the cylindrical metal fitting set in the mold is pressed in the axial direction with the blade portion contacting the end, and the end surface is uneven by the blade portion. An anti-slip processing method for a metal end face of a rubber member with metal fittings, characterized in that the processing is applied. Anti-slip blades are provided at the contact portions of the vulcanizing mold with the both end faces of the cylindrical metal fitting, and both end faces of the cylindrical metal fitting are closed by closing the mold of the vulcanizing mold. The method for preventing slipping of the metal end face of the rubber member with metal fittings according to claim 1, wherein a process for forming irregularities by biting the blade portion is applied to the metal member end face. The anti-slip process of the metal fitting end face of the rubber member with metal fittings according to claim 1 or 2, wherein the anti-slip process is a process of forming serrations in which crests and troughs are alternately continued in the circumferential direction of the end face of the cylindrical metal fitting. Method. A vulcanization mold used in a method of applying a non-slip process to an end face of the cylindrical metal fitting in a rubber member with a metal fitting having a cylindrical metal fitting as a mounting member and a rubber part vulcanized and bonded to the outer periphery thereof Because
An upper mold and a lower mold that can be closed opposite to each other are provided, and both upper and lower molds each have a support that supports both ends of the cylindrical metal fitting, and at least one of the two cylindrical supports A vulcanization mold, wherein an abutting portion with a metal fitting end surface is provided with a non-slip blade for biting into the cylindrical metal fitting end surface when the die is closed. The upper and lower support members have annular stepped surface portions that contact the end surfaces of the cylindrical metal fittings on the outer periphery of the bases of the support pins that are fitted into both ends of the cylindrical metal fittings when the mold is closed. The vulcanization mold according to claim 4, wherein the blade portion is formed.

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