JP2001193730A - High speed rotational composite member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high speed rotational composite member capable of reducing the deflection of the center axis of a soft part, and suppressing the noise caused by the deformation and vibration of the soft part when rotated at high speed about the center axis of the soft part. SOLUTION: This high speed rotational composite member consists of a soft part formed of a cylindrical or columnar rubber elastic material and a hard part formed of the thermoplastic resin joined to the soft part. The soft part and hard part are chemically joined. The hard part may be of flat plate shape symmetrical with respect to the center axis of the soft part, and may be joined to the end of the soft part. The rubber elastic material contains the vulcanized rubber or thermoplastic elastomer. The soft part and hard part may be joined by a direct chemical reaction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-speed rotating composite member composed of a soft part and a hard part used for machine parts and the like.

[0002]

2. Description of the Related Art It is common practice to fix a tubular or columnar long soft member to a hard member made of a thermoplastic resin and use it as a high-speed rotating part. Conventionally, the fixing of the soft part and the hard part in such a high-speed rotating component has been performed by mechanical screwing in order to obtain the reliability of the connection. However, in this method, although the connection is secure, the center of the soft part is often shifted from the actual axis of rotational symmetry due to the strength of the screw tightening, and the soft part is deformed or vibrates at high speed rotation. there were.

[0003]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a soft part which is rotated at a high speed around the central axis.
It is an object of the present invention to provide a high-speed rotating composite member that can reduce the displacement of the central axis of the soft part and suppress the generation of noise due to deformation and vibration of the soft part.

[0004]

Means for Solving the Problems The inventors of the present invention have made intensive studies to achieve the above object. As a result, when the soft part and the hard part are chemically bonded, they can withstand high-speed rotation and have the soft part. The present inventors have found that the displacement of the central axis can be significantly reduced, and completed the present invention.

That is, the present invention comprises a soft portion made of a cylindrical or columnar rubber-like elastic material which rotates around a central axis, and a hard portion made of a thermoplastic resin joined to the soft portion. A high-speed rotating composite member, wherein the soft part and the hard part are joined by a chemical bond. The hard portion may have a flat plate shape symmetric with respect to a central axis of the soft portion, and may be joined to an end of the soft portion. The rubbery elastic material includes a vulcanized rubber, a thermoplastic elastomer and the like. The soft part and the hard part may be joined by a direct chemical reaction.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings as necessary. FIG. 1 is a longitudinal sectional view showing an example of the high-speed rotating composite member of the present invention, and FIG. 2 is a plan view of the high-speed rotating composite member.

This high-speed rotating composite member is provided with a frustum-shaped cylindrical body of rotation 1a and one end in the longitudinal direction of the body of rotation 1a perpendicular to the center axis X of the body of rotation 1a. Soft part (flexible part) 1 comprising the provided flange part 1b
And a disk-shaped hard portion 2 having a circular center portion. The hard portion 2 is joined to an end of the soft portion 1, that is, an outer surface of the flange portion 1 b by chemical bonding. ing. The hard part 2 is a flat plate symmetrical with respect to the central axis X of the soft part 1, and the diameter of the hard part 2 is formed larger than the diameter of the rotating body 1 a of the soft part 1. In addition, soft part 1
Is formed of a soft rubber-like elastic material, and the hard portion 2 is formed of a thermoplastic resin. This high-speed rotating composite member
It is used by being rotated around the central axis X.

[0008] The thermoplastic resin constituting the hard portion 2 is not particularly limited, but from the viewpoint that deformation does not occur upon contact with molten rubber or the like, a load under a 0.455 MPa load specified in ISO 75 is used. Deflection temperature is 14
A thermoplastic resin having a temperature of 0 ° C. or higher, particularly 150 ° C. or higher is preferable. More specifically, polyphenylene ether (PPE) such as poly (2,6-dimethylphenylene oxide) and a modified product thereof, polyphenylene sulfide, polybutylene terephthalate, polyamides such as polyamide 66 and polyamide 612, and polyoxymethylene (POM) and polymer blends or polymer alloys of these resins with other resins are preferred thermoplastic resins. These thermoplastic resins can be used alone or in combination of two or more.

In the hard portion 2, in addition to the thermoplastic resin, various stabilizers, plasticizers, processing aids, fillers, coloring agents, antistatic agents, Substances that are usually used as additives to resins, such as flame retardants, may be added.

The rubbery elastic material constituting the soft portion 1 is not particularly limited as long as it is a polymer compound having a so-called rubbery viscoelastic behavior. For example, vulcanized rubber, thermoplastic elastomer (styrene, polyurethane) , Polyester, polyamide, and polyolefin thermoplastic elastomers). Note that the rubber-like elastic material does not necessarily need to exhibit a rubber-like viscoelastic behavior before forming a chemical bond with the constituent components of the hard part 2; The rubber-like viscoelastic behavior may be obtained after the above. For example, when an unvulcanized rubber containing a vulcanizing agent is chemically bonded by contact with a thermoplastic resin, the vulcanization of the rubber proceeds simultaneously with the formation of a chemical bond and exhibits a rubber-like viscoelastic behavior. Become like

As the rubber constituting the vulcanized rubber, a wide range of natural and synthetic rubbers can be used. Typical examples thereof include natural rubber (NR) and nitrile rubber (NB).
R: acrylonitrile-butadiene rubber), styrene-
Butadiene rubber (SBR), ethylene-propylene rubber (EPR), ethylene-propylene-diene rubber (EP
DM), chloroprene rubber (CR), butyl rubber (II
R), hydrogenated NBR (H-NBR), acrylonitrile-isoprene rubber (NIR), acrylonitrile-isoprene-butadiene rubber (NBIR), silicon rubber (MVQ), fluorine rubber (FPM) and the like.
These rubbers include, for example, acid-modified rubbers such as carboxylated rubbers containing, as a comonomer, acids such as unsaturated carboxylic acids such as (meth) acrylic acid, maleic acid, and maleic anhydride, and other modified rubbers. It is. These rubbers can be used alone or in combination of two or more.

When the thermoplastic resin forming the hard portion 2 is polyamide, the rubber component of the vulcanized rubber forming the soft portion 1 may be, for example, carboxylated EPR,
It is preferable to use acid-modified rubber such as carboxylated rubber (carboxyl group-containing rubber) such as carboxylated EPDM and carboxylated NBR. When the thermoplastic resin forming the hard part 2 is a polyphenylene ether composition, the rubber component of the vulcanized rubber forming the soft part 1 is preferably NR, SBR, BR, IR, IIR,
EPDM, a mixture thereof, or a mixture of these with other rubbers, and more preferably (i) a composition of SBR or other rubber and SBR, of a peroxide-cured or sulfur-cured type. And (ii) a composition of EPDM or other rubber and EPDM, which is a peroxide-cured type. When a thermoplastic resin and a rubber are used in combination, a chemical bond is generated at the interface between the hard part 2 and the soft part 1, so that extremely strong bonding is possible.

When a resin such as polyamide or polyphenylene ether is used as the thermoplastic resin forming the hard portion 2, it is preferable to use silicone rubber as a rubber component of the vulcanized rubber forming the soft portion 1. In this case, by using a silane-based primer, the hard part 2 and the soft part 1 can be chemically bonded, and a large bonding strength can be obtained. Silicon rubber is particularly suitable as a material for high-speed rotating members because it is resistant to repeated fatigue.

In order to improve properties such as hardness and durability, the soft portion 1 contains additives usually used in rubber products, such as vulcanizing agents, vulcanization accelerators, softening agents, plasticizers, and the like. Agents, fillers, vulcanization accelerators, antioxidants, reinforcing agents, silane compounds, and the like may be added.

As the vulcanizing agent, a conventional vulcanizing agent, for example,
Sulfur, sulfur-containing compounds, organic peroxides, metal oxides and the like are used. The amount of the vulcanizing agent is, for example, 100 rubbers.
It is about 1 to 10 parts by weight based on parts by weight.

The vulcanization accelerator can be selected according to the type of the vulcanizing agent. When using sulfur or a sulfur-containing compound as a vulcanizing agent, as a vulcanization accelerator, for example, benzothiazoles, benzothiazole sulfenamides, dithiocarbamate salts, xanthogens, thioureas, dithiocarbamyl sulfenamides , Guanidines, thiurams and the like are used. When using an organic peroxide as a vulcanizing agent, as a vulcanization accelerator,
(Meth) acrylates such as 1,4-butanediol di (meth) acrylate and trimethylolpropane tri (meth) acrylate, triarylates such as triallyl cyanurate, and metaphenylenedimaleimides are used. The compounding amount of the vulcanization accelerator can be selected depending on the required physical properties of the rubber, the vulcanization rate, the combination with the vulcanizing agent, and the like.
About 5 parts by weight.

As the softener, a general petroleum-based process oil or the like is used. Specific examples include paraffin oil, naphthenic oil, and aromatic oil. In addition, as a plasticizer, for example, in addition to low molecular weight plasticizers such as phthalate ester, sebacate ester, adipic acid ester, and phosphate ester, various polyester-based plasticizers, chlorinated polypropylene, and the like can also be used according to applications. . The blending amounts of the softener and the plasticizer can be arbitrarily selected, for example, in the range of about 0 to 150 parts by weight based on 100 parts by weight of the rubber according to the required physical properties of the rubber.

As the filler, general ones used in rubber compositions, for example, carbon black, silicic acid, silicate, calcium carbonate, zinc oxide, barium sulfate, magnesium sulfate, talc, kaolin and the like can be used. Can be. The amount of the filler can be selected in the range of about 10 to 300 parts by weight based on 100 parts by weight of the rubber, depending on the required physical properties of the rubber.

The shape of the rotating body 1a of the soft portion 1 is not limited to the above example, but may be cylindrical, prismatic, truncated pyramid, or the like; or cylindrical, truncated cone, pyramid, or the like. A columnar shape such as a trapezoidal shape may be used, and a rotationally symmetric shape is particularly preferable. The rotator main body 1a often has a long frame shape that is long in the central axis X direction.

The hard part 2 is not necessarily the center axis X of the soft part 1.
May not be provided symmetrically with respect to the central axis X, but is preferably symmetrical with respect to the central axis X in order to suppress the deflection of the soft portion 1 during high-speed rotation. Further, the shape of the hard portion 2 is desirably a flat shape from the viewpoint of easy connection with other members. The hard portion 2 can be provided at an arbitrary portion such as an end portion of the rotating body 1a of the soft portion 1 or a central portion in a longitudinal direction.

The method of chemically bonding the soft part 1 and the hard part 2 is not particularly limited, and a common or known method can be adopted. For example, (i) a primer such as an adhesive or a silane-based primer (silane coupling agent) capable of forming a chemical bond with the soft part 1 and the hard part 2 on at least one surface of the soft part 1 and the hard part 2. (Ii) a method of chemically bonding the two parts by co-vulcanization at the contact interface between the soft part 1 and the hard part 2;
(Iii) Polymer at contact interface between soft part 1 and hard part 2
A method in which both sites are chemically bonded by polymer diffusion (chemical bonding in a diffusion region) is exemplified. These methods can be appropriately selected according to the combination of the rubber-like elastic material forming the soft portion 1 and the thermoplastic resin forming the hard portion 2. Among the above methods, the method (ii) or (iii) of joining the soft part 1 and the hard part 2 by a direct chemical reaction is particularly preferable.

According to the high-speed rotating composite member having the above-described structure, the soft part 1 and the hard part 2 are joined by a chemical bond. Sex) can be maintained. Therefore, even when rotating at a high speed, the shaft is not deflected, and it is possible to suppress deformation of the soft portion 1 and generation of noise due to vibration. The present invention relates to the hard part 2
Is provided at the end of the soft portion 1 in the direction of the central axis X, or when the hard portion 2 has a flat plate shape perpendicular to the central axis X of the soft portion 1. This is particularly useful in cases where liable to occur.

The high-speed rotating composite member of the present invention can form a chemical bond between the composition containing the rubber-like elastic material constituting the soft portion 1 and the composition containing the thermoplastic resin constituting the hard portion 2. It can be manufactured by contact under conditions. Although various methods can be adopted as this production method, from the viewpoint of forming a chemical bond, the hard portion 2 is first molded from a composition containing a thermoplastic resin by injection molding, extrusion molding, or the like. After a surface treatment such as a primer treatment is performed on the soft portion 1, the hard portion 2 is brought into contact with the composition containing the rubbery elastic material constituting the soft portion 1 in a molten state.
(For example, injection molding, press molding, etc.) is preferable.

The molding conditions for each part can be appropriately set according to the material constituting the part. For example, when the soft part 1 is molded under vulcanization conditions, the vulcanization temperature generally ranges from 110 to 2
The temperature is about 20 ° C, preferably about 160 to 180 ° C.
The pressure at which the soft part 1 is formed by press molding is, for example, 50 to 2000 kgf / cm ² (4.91 to
196 MPa).

The high-speed rotating composite member of the present invention is, for example, 5
A rotating member of a machine or an instrument that rotates at a rotation speed of 0 rpm or more (about 50 to 5000 rpm), more specifically, a viscous liquid transfer device using the Weissenberg effect, a low-viscosity liquid transfer tube using the ballast effect, It can be used as an outer part of an extremely small diameter wire drill, a member such as a joint between a rotational drive force such as a motor and a drive shaft, and the like.

[0026]

According to the high-speed rotating composite member of the present invention, the soft part and the hard part are joined by a chemical bond.
Higher symmetry (homogeneity) can be maintained as compared with a mechanical joining method using screws, and even when rotating at a high speed, there is no deviation of the shaft, and it is possible to suppress deformation of the soft part and occurrence of vibration.

[0027]

The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto.

Example 1 A high-speed rotating composite member shown in FIG. 1 was manufactured as follows. The inner diameter a at the upper end of the rotating body 1a of the soft part 1 having a truncated cone shape is 10 mm, the inner diameter b at the lower end is 30 mm, the height h is 150 mm, and the thickness is 1 mm. 2, the inner diameter b is 30 mm, the outer diameter c is 60 mm, and the thickness is 2 mm. The hard part 2 was formed by injection molding using Best Run 1900 (modified PPE) manufactured by Daicel Huls Co., Ltd. Ethylene-propylene-diene rubber (EPDM) (BUNAAP 4
47, manufactured by Bayer AG) 90 parts by weight, polyoctenylene (Vestenamer 8012, manufactured by Degussa Huls) 5
Parts by weight, oil (Tudalen Oil B801)
3) 51 parts by weight, 72 parts by weight of carbon black (N539), 1 part by weight of an antioxidant (Vulkanox IIS), trimethylolpropane trimethacrylate (TR)
IM) 1.25 parts by weight and peroxide (Perkadox)
14/40) The rubber composition mixed with 5.5 parts by weight was brought into contact by injection molding, and the soft part 1 was formed while co-vulcanizing at the contact interface to obtain the high-speed rotating composite member. In this composite member, the separation between the soft part 1 and the hard part 2 could be achieved only by cohesive failure.

Example 2 A high-speed rotating composite member having the same shape and size as in Example 1 was used.
It was manufactured as follows. The hard part 2 was formed by injection molding using Best Run 1900 (modified PPE) manufactured by Daicel Huls Co., Ltd. A silane-based primer is applied to a portion of the hard portion 2 that is to be bonded to the soft portion 1,
After drying, the silicone rubber containing a vulcanizing agent is brought into contact with a hot press, and the soft portion 1 is co-vulcanized at the contact interface.
Was formed to obtain the high-speed rotating composite member. In this composite member, the separation between the soft part 1 and the hard part 2 could be achieved only by cohesive failure.

Example 3 A high-speed rotating composite member having the same shape and size as in Example 1 was used.
It was manufactured as follows. The hard part 2 was molded by injection molding using Vestamide X7094 (polyamide 612) manufactured by Daicel Huls Co., Ltd. This hard part 2
After applying and drying a silane-based primer to a portion to be bonded to the soft portion 1, a silicone rubber containing a vulcanizing agent is brought into contact with a hot press, and the soft portion 1 is co-vulcanized at the contact interface. Thus, the high-speed rotating composite member was obtained. In this composite member, the separation between the soft part 1 and the hard part 2
It could only be achieved by cohesive failure.

COMPARATIVE EXAMPLE 1 A soft portion 1 and a hard portion 2 were formed by using the same material as in Example 1 and separately molded into a soft portion 1 and a hard portion 2.
Were fixed by screwing with screws, and a high-speed rotating composite member having the same shape and size as in Example 1 was obtained.

COMPARATIVE EXAMPLE 2 Using the same material as in Example 2, the soft part 1 and the hard part 2 were separately molded and manufactured.
Were fixed by screwing with screws, and a high-speed rotating composite member having the same shape and size as in Example 1 was obtained.

COMPARATIVE EXAMPLE 3 Using the same material as in Example 3, the soft part 1 and the hard part 2 were separately molded and manufactured.
Were fixed by screwing with screws, and a high-speed rotating composite member having the same shape and size as in Example 1 was obtained.

Evaluation test (Rotation runout) The hard part 2 of each composite member produced in the example and the comparative example was fixed to a rotating plate rotated by an electric motor.
It was rotated at a speed of 1500 rpm. The rotating state at that time was visually observed and evaluated according to the following criteria. A: No rotation blur was observed. B: Some rotation blur was observed. C: Large blur occurred. (Sound) In the rotational shake test, the magnitude of the sound was judged simultaneously by the ears, and evaluated according to the following criteria. A: The sound was low. B: There was a loud noise. Table 1 shows the test results.

[0035]

[Table 1]

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of a high-speed rotating composite member of the present invention.

FIG. 2 is a plan view of the high-speed rotating composite member of FIG. 1;

[Explanation of symbols]

 1 Soft part 1a Rotating body 1b Flange part 2 Hard part

Continued on front page F-term (reference) 3J048 AA01 BB01 BD01 BD04 BD05 BD06 EA29 EA31 3J103 AA04 FA03 FA04 GA02 GA52 HA12 HA41 HA53 4F071 AA10B AA15X AA20X AA21X AA51B AC08A AE02A AE03A A03 CA02 CA06

Claims (4)

[Claims] 1. A high-speed rotating composite member comprising a soft portion made of a rubber-like elastic material having a cylindrical or columnar shape and rotating around a central axis, and a hard portion made of a thermoplastic resin joined to the soft portion. A high-speed rotating composite member, wherein the soft part and the hard part are joined by a chemical bond. 2. The high-speed rotating composite member according to claim 1, wherein the hard part has a flat plate shape symmetrical with respect to a central axis of the soft part and is joined to an end of the soft part. 3. The high-speed rotating composite member according to claim 1, wherein the rubber-like elastic material is a vulcanized rubber or a thermoplastic elastomer. 4. The high-speed rotating composite member according to claim 1, wherein the soft part and the hard part are joined by a direct chemical reaction.