JP2008275076A - Vibration damping material for machine component, method of manufacturing the same, and machine component using vibration damping material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration damping material for a machine component, capable of easily selecting a material according to a demand with few restrictions in respect of the material, being widely applied to many machine components, and easily achieving further excellent vibration damping characteristics. <P>SOLUTION: A ringl-like material 2 having a groove portion 21 formed by a plastic working and/or machining has nonbonding interfaces which are in contact with each other without being metallically coupled to each other, and which are formed by a method for performing the plastic working by a ring rolling working which performs rolling in a direction where the material 2 is radially extended and also a space in the groove portion 21 is reduced. The nonbonding interfaces are formed from a surface to a predetermined depth in an inside, and it is preferable that they do not penetrate through. It is preferable that the length of the nonbonding interfaces in a depth direction is set to be 20% or more of thickness dimension in the same direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a material for processing parts used in automobiles, construction machines, industrial machines, and the like, and in particular, for machine parts that can greatly improve the vibration damping performance regardless of the material used. The present invention relates to a vibration damping material and a manufacturing method thereof.

  In automobiles, construction machines, industrial machines, etc., each part is driven by power generated by an engine, a motor, or the like. The parts used for them have various required characteristics such as surface pressure resistance and bending strength, and materials suitable for satisfying them are selected and used.

  And most of these materials are alloys such as Fe and Al, but there are drawbacks that are difficult to solve with the materials themselves. In other words, parts made of these alloys are easy to propagate the vibration generated in the environment of use, and there is a limit to the ability to attenuate the vibration with only that part, resulting in noise and lowering the quietness, vibration This may reduce the service life of the parts.

  For example, in recent automobiles, it is not possible to satisfy the strict demands of users by simply having excellent engine performance, and a high level of quietness is required in the car while driving. I came. In the case of automobiles, gear noise is one major factor in noise generation. However, gears that cause noise generation are generally carburized, and there is an adverse effect on gear meshing due to the occurrence of heat treatment distortion. It has been found that this is the cause of noise generation. Therefore, while various technological developments aimed at reducing heat treatment strain have been actively conducted, development of a technique for blocking or reducing generated sound and vibration has been strongly desired.

  Taking this gear noise as an example, in order to prevent the occurrence, it is not unthinkable to perform a finishing process again after the carburizing process to eliminate the heat treatment distortion. However, a large cost is required for the finishing process. In addition, it is technically possible to provide a damper mechanism in the gear or the unit in which it is incorporated, but there is a cost limitation due to securing the space and increasing the number of parts. The current situation is that the adoption of measures is not progressing. Therefore, there has been a strong demand for the development of technology capable of ensuring quietness that can be satisfied by the user even if the produced gear is used with the distortion caused by carburization remaining.

  As the most direct improvement method for this problem, there is a method in which a part is manufactured with a damping material and vibration is absorbed by the part itself. However, as known damping materials, iron-based high alloys, pure Mg, Mg alloys, or Mn-Cu alloys are well known, but it goes without saying that they are all expensive. In addition, when used as a machine structural part, there is a problem that sufficient strength cannot be secured. Moreover, even if it is a composite steel plate with excellent vibration damping properties known in the steel plate field, there are restrictions on the shape of the steel plate when it comes to mechanical structural parts, especially power transmission parts, and the usable range is extremely small . Accordingly, there has been a strong demand for the development of a material capable of imparting excellent vibration damping properties regardless of the type of material without causing these problems.

  As a measure for improving the vibration damping performance without using a material having a special vibration damping property as described above, a method of conventionally introducing an interface such as a crack that is not intentionally metal-bonded into a component is good. For example, the techniques described in Patent Documents 1 and 2 are known.

  Among them, the technique described in Patent Document 1 forms a brittle layer (part) in the material, and then applies a thermal shock such as overheating and quenching to intentionally generate cracks in the material, thereby suppressing vibration. It is intended to increase.

  Further, Patent Document 2 intends to form a linear bead portion at a required portion of a metal plate and to enhance the vibration damping effect of the metal plate by cracks generated in the bead portion.

JP-A-52-147510 JP 2000-35082 A

However, the above-described conventional invention has the following problems.
In order to form a brittle layer inside the material, the invention described in Patent Document 1 described above is intentionally carburized in low-carbon steel, or previously used high-carbon steel which is a brittle material, and rapidly cooled to it. It is characterized by giving a thermal shock.

  Therefore, if the technology of Patent Document 1 is used to improve the vibration damping of machine parts, carburization is required even when used for parts that do not require carburization due to strength, or high carbon steel is used. Therefore, materials that are easily cracked, such as high carbon steel, will be used for parts that are not suitable, and it is not possible to select a material that is originally determined to be optimal or a suitable heat treatment, and the selection of materials and heat treatment methods is significantly limited. There is a problem of end.

  In addition, as described in the specification, the invention described in Patent Document 2 uses quench hardening ability, uses a metal plate having high quench hardening ability and high cracking sensitivity, and generates cracks. A feature is that a bead portion is formed at a portion to be caused to be cracked. Therefore, this technique inevitably has its effect unless a metal plate with high quench hardening capability is used. In addition to restrictions on the shape of steel plates, the scope of application is greatly limited. There is a problem that it ends up.

  The present invention has been made in view of such conventional problems, and there are few restrictions in terms of material, and it is easy to select a material according to demand, and it can be widely applied to many machine parts, and further excellent. An object of the present invention is to provide a vibration damping material for machine parts that can easily obtain vibration damping characteristics.

  According to a first aspect of the present invention, a ring-shaped material having a groove formed by plastic processing and / or machining is plasticized by ring rolling processing in which the material is stretched in the radial direction and rolled in a direction to reduce the space in the groove. A vibration damping material for mechanical parts, characterized in that it has a non-bonding interface formed by a method of applying processing and contacting without metallic bonding (Claim 1).

  The present invention has a non-bonding interface intentionally provided by a specific means of forming a non-bonding interface in a ring-shaped material by performing plastic working and / or machining and ring rolling. . By providing such a non-bonding interface, a sufficiently large vibration damping improvement effect can be obtained.

  The non-bonding interface can be generated by performing the plastic working and / or machining and the ring rolling as described above. Therefore, if these materials can be processed, there is an advantage that a large vibration damping effect can be obtained in common. Compared with the inventions described in Patent Documents 1 and 2, the material surface limit is made much smaller. Can do.

  Moreover, in order to generate a non-bonding interface by performing the plastic processing and / or machining and the ring rolling process in this order, the position of the non-bonding interface is naturally set to a position and shape convenient for the machine part. It becomes easy. Therefore, by providing a non-bonded interface at a position where there is no problem in the strength of the part (= position where high stress is not applied), a material that can produce a mechanical part that has a non-bonded interface but does not have any problem in strength Can be obtained.

Further, in order to ensure excellent vibration damping properties, it is necessary that the generated gap of the non-bonding interface is closed and is in contact without metal bonding. Note that the contact here includes a case where a non-contact portion is partially present when viewed microscopically, and includes all cases where the contact is apparently made at the interface.
As described above, a non-bonded interface in such a state can be easily obtained by performing plastic working and / or machining and ring rolling.
Therefore, according to the present invention, there are few restrictions in terms of material, and it is easy to select a material according to requirements, and it can be widely applied to many machine parts, and further excellent damping characteristics can be easily obtained. It is possible to provide a vibration damping material for machine parts.

A second invention is a method of manufacturing a vibration damping material for mechanical parts having a non-bonding interface that is in contact without being metallically bonded,
A groove portion forming step of forming a ring-shaped material having a groove portion that becomes a non-bonding interface on the surface by plastic working and / or machining;
Ring rolling that forms the non-bonded interface by applying plastic working by ring rolling processing that stretches the material in the radial direction and performs rolling in a direction to reduce the space in the groove portion, and brings the facing inner wall surfaces into contact with each other. And a process for producing a vibration damping material for mechanical parts (claim 8).
According to this manufacturing method, the above-described excellent vibration damping material for machine parts can be reliably manufactured.

  According to a third aspect of the present invention, there is provided a mechanical component produced by processing the vibration damping material for a mechanical component according to the first aspect. Machine parts made by using the above-mentioned excellent vibration damping material for machine parts as a raw material, such as gears having teeth formed on the vibration damping material for machine parts, are extremely excellent vibration damping. It exhibits its characteristics and is useful.

Hereinafter, the contents of the invention will be described in detail.
The vibration damping material for machine parts according to the first aspect of the present invention is rolled into a ring-shaped material having a groove formed by plastic working and / or machining so as to stretch the material in the radial direction and reduce the space in the groove. It has a non-bonding interface which is formed by a method of applying plastic processing by ring rolling processing to make contact without metallic bonding.

The formation of the non-bonded interface in the vibration damping material for mechanical parts of the present invention can be performed by executing at least the groove forming step and the ring rolling step as in the second aspect.
The groove forming step is performed by plastic working, machining, or a combination of both. Selection of these processing methods can be performed according to the material, and can be performed cold, or heated and heated.

In addition, when machining the groove part in the groove part forming step by machining, the machining of the groove part is not limited as long as the inner space of the groove part can be finally closed and the machining method is particularly limited. And various means can be selected.
In addition, when the groove portion is processed by plastic processing such as hot forging or cold forging, it is easy to process the V-shaped groove. Of course, a V-shaped groove can also be formed by machining.

The ring rolling process is performed by ring rolling.
The ring rolling process is a process in which a ring-shaped material is processed using several rolls (main roll, mandrel, guide roll). The main roll and a mandrel arranged in parallel to the rotation axis of the main roll. A ring-shaped material wall is sandwiched in the radial direction with the (sub roll), and the material is moved in the radial direction by rotating the main roll while pressing the mandrel toward the main roll. In addition to stretching, rolling is performed in a direction that reduces the space in the groove. By processing until the inner wall surface facing the groove portion comes into contact, molding of the non-bonded interface is completed.

The ring rolling process may be performed cold or hot.
Since the ring rolling process is sequential forming, it is possible to form with a low processing stress, which is advantageous in terms of the life of the apparatus compared to forging and the like, and since the material yield is good, the productivity is high.
In addition, by designing the shape of the groove to be a volume, that is, to design the shape other than the groove and the groove according to the final shape, the material flow is uniform in the circumferential direction. Securement can be performed satisfactorily.
In addition, the dimensional accuracy of molding is better than that of press forging.

  The contact on the interface mentioned here is just an appearance, and it is not necessary whether the entire surface is strictly in contact. Therefore, as a result of microscopic observation, even if there is a non-contact part partially or continuously, it does not fall out of the scope of the present invention for that reason, and appears to be almost in contact with the naked eye. It is enough if it is processed to the state. By processing to such a state, the vibration damping property can be greatly improved.

In the vibration damping material for mechanical parts, it is preferable that the non-bonding interface is formed from the surface to a predetermined depth inside, and does not penetrate.
Further, since the effect of improving vibration damping is affected in proportion to the size of the non-bonded interface to be generated, it is necessary to generate a large non-bonded interface to some extent. That is, the larger the area of the non-bonding interface, the greater the effect of damping the vibration. It is preferable that the total depth of the non-bonding interfaces formed on the surface surfaces of both ends is 20% or more of the thickness dimension in the same direction (Claim 3).

  The reason why the lower limit of the length in the depth direction is set to 20% is that if it is less than 20%, the vibration damping effect may not be sufficiently obtained. In addition, although the upper limit is not particularly defined, even if the position of the non-bonding interface is selected so as to be a part where a large stress is not applied, there is a problem in strength depending on the state of the part shape, the stress applied, etc. When there is a possibility of occurrence, it is necessary to appropriately determine the upper limit of the interface depth according to the component to be applied. As a guideline, it is desirable to be about 90% or less. In order to obtain a sufficient damping effect, it is desirable that the interface depth is 50% or more of the thickness dimension in the same direction.

The mechanical component damping material is a gear damping material for forming a gear having damping characteristics, and a ring-shaped main body and a tooth pattern formed on the outer peripheral side surface or inner peripheral side surface thereof. Preferably, the non-bonding interface is formed from at least one end surface in the axial direction of the main body (claim 4).
In this case, since the effect can be effectively utilized, the vibration damping material for mechanical parts can be used as a gear damping material for gears for forming a gear having damping characteristics.

  A gear is a part that plays the role of transmitting the power of an engine or the like by meshing teeth with each other, but stress is not uniformly applied to the entire gear part, and the driving force is concentrated on the tooth part. Therefore, a large force may be applied to a region other than the tooth portion on the outer periphery or the inner periphery in a position away from the tooth portion, that is, for example, a gear whose teeth are processed on the outer periphery or the inner periphery. Absent. Depending on the case, a through hole may be partially formed for weight reduction. Therefore, the present inventors pay attention to the stress load state in such a gear, and form a non-bonding interface at a position away from the tooth processing region by an appropriate length. In the same way as above, a fatigue test with a driving force applied was performed. As a result, when the driving force to be applied was increased, it was understood that the strength limit of the gear occurred due to the destruction of the tooth portion, not the destruction from the non-bonding interface, and the effectiveness of the present invention was confirmed. Is.

The gears are often carburized when it is necessary to obtain high strength, but the present invention can provide excellent vibration damping properties regardless of the presence or absence of the carburizing treatment.
Therefore, by producing a gear using the vibration damping material for mechanical parts of the present invention, a gear having extremely excellent vibration damping can be easily produced.

The non-bonding interface is preferably formed in an annular shape (Claim 5).
In this case, transmission of vibrations inside and outside the ring can be reliably suppressed.
In this case, the non-bonding interface can be formed in a circular shape (Claim 6).
When a circular shape is adopted, it is possible to easily form a non-bonding interface.
In addition, the non-bonding interface may be formed in an asymmetric shape.
As an asymmetric shape, there are an irregular polygon, an irregular waveform, and various other shapes. In this case, it can be expected to further improve the vibration damping effect.

Moreover, you may have the weld part which welded a part of boundary exposed part of the said nonbonding interface.
In this case, by fixing the non-bonding interface part on the surface of the vibration damping material for machine parts from the outside, sufficient strength can be exhibited without impairing the excellent vibration damping property due to the non-bonding interface. it can.
When all the boundary exposed portions of the non-bonding interface are welded, the effect obtained by forming the non-bonding interface may be hindered. Therefore, it is preferable to provide the said weld part intermittently in a boundary exposure part.

In addition, in order to maintain excellent vibration damping performance by having a non-bonding interface and to ensure sufficient strength, the depth of the welded portion is 1/2 or less of the thickness of the vibration damping material for machine parts. It is preferable.
The welding is preferably laser beam welding or electron beam welding. In this case, high-precision welding is possible, and a desired portion at the non-bonding interface can be reliably welded.

2nd invention WHEREIN: It is preferable to perform the said groove | channel formation process by forging using the metal mold | die which has a projection part corresponding to the said groove part (Claim 9).
By selecting a desired shape as the shape of the projection, the shape of the groove can be controlled.
In addition, since the non-bonded interface only needs to be in an apparently finally contacted state, the cross-sectional shape of the groove portion to be processed first is a shape that is convenient for processing (it is necessary to be concerned about the problem of mold life that is easy to process and used Can be selected freely.

Example 1
Next, the Example concerning the damping material for machine parts of this invention is described using FIGS. 1-3.
First, as shown in FIG. 1, a ring-shaped material 2 having a groove portion 21 formed by plastic working and / or machining is prepared. As shown in FIG. 3, the material 2 is stretched in the radial direction and the groove portion is formed. As shown in FIG. 2, a mechanical part having a non-bonding interface 3 that is in contact with the metal without being bonded as a result of plastic working by ring rolling that performs rolling in the direction of reducing the inner space. A vibration damping material 1 (sample E1) was prepared.

  The chemical composition of the steel used as the material 2 is 0.21% C-0.32% Si-0.77% Mn-1.16% Cr-0.16% Mo-0.032% Al-0.011. % N steel, which uses a commercially available JIS-SCM420H round bar.

In the method of manufacturing the vibration damping material 1 for machine parts, first, a machining process was performed to perform a groove portion forming step of forming a ring-shaped material 2 having a groove portion 21 that is a source of a non-bonding interface on the surface. Thereafter, the material 2 is stretched in the radial direction and plastic working is performed by ring rolling which performs rolling in the direction of reducing the groove inner space, and the inner wall 22 on the outer diameter side and the inner wall 23 on the inner diameter side are brought into contact with each other. A ring rolling process for forming the non-bonding interface 3 was performed by setting the state.
Hereinafter, the groove forming process and the ring rolling process corresponding to the present invention will be described.

  In the groove forming step, the steel (SCM420H) is heated, a crushing step of crushing the heated steel is performed to form a rough ground, hot forging is performed on the obtained rough ground, and an outer diameter P is set. An intermediate body of 94.5 mm, an inner diameter Q of 67.2 mm, and a thickness R of 23.7 mm was prepared. When this intermediate body is machined, as shown in FIG. 1, the distance L from the center O to the inner wall surface 22 on the outer diameter side is 41.2 mm, the width W is 2 mm, the depth is concentric with the material 2 on the surface. A groove portion 21 having X of 5 mm was formed.

  In this example, since the scale exists in the formed non-bonding interface 3, the ring-shaped material 2 obtained in the groove forming step is normalized (after 925 ° C. × 1 hr). , Air cooling) and shot blasting.

  Next, the ring rolling step was performed cold. In the ring rolling step, as shown in FIG. 3, the wall portion of the ring-shaped material 2 is sandwiched between the main roll 41 and a mandrel 42 (sub roll) arranged in parallel to the rotation axis of the main roll 41. The material roll 2 is stably held by the guide roll 43, and the main roll 41 is rotated while pressing the mandrel 42 toward the main roll 41 (A direction). Was rolled in the direction of extending the diameter in the radial direction and reducing the space in the groove 21.

As a result, in appearance, the inner wall surface 23 on the inner diameter side of the molded groove 21 and the inner wall surface 22 on the outer diameter side were in contact with each other. Therefore, in this state, the processed test piece was cut and the cross section was observed, but as shown in FIG. 2, the non-bonding interface 3 almost in contact with the inside was formed.
As shown in FIG. 2, the vibration damping material 1 for mechanical parts obtained in this example has an outer diameter S of 122 mm, an inner diameter T of 104 mm, a thickness U of 21.5 mm, and the non-bonding interface 3 having a depth of Z was 4.6 mm, and the distance Y from the center O was 53.25 mm. The non-bonding interface is in a state where a scale exists.
Table 1 shows the sample type E1, the sample E2 to the sample E6, the sample C1, and the sample C2 to be described later. Indicates distance.

(Example 2)
In this example, a vibration damping material for machine parts (sample E2) was produced as an example of the present invention.
In this example, normalization and shot blasting in Example 1 are omitted. Others were performed in the same manner as in Example 1.
The vibration damping material for mechanical parts (sample E2) obtained in this example has an outer diameter S of 122 mm, an inner diameter T of 104 mm, a thickness U of 21.5 mm, and a non-bonding interface with a depth Z of 4. The distance Y from the center O was 6 mm, and 53.25 mm. And the non-bonding interface is in a state without scale.

(Example 3)
In this example, a vibration damping material for mechanical parts (sample E3) was produced as an example of the present invention.
This example is an example in which the depth of the groove portion in the first embodiment is changed. The groove portion of the sample E3 has a distance L from the center O of 41.2 mm, a width W of 2 mm, and a depth X of 10 mm. Others were performed in the same manner as in Example 1.
The vibration damping material for mechanical parts (sample E3) obtained in this example has an outer diameter S of 122 mm, an inner diameter T of 104 mm, a thickness U of 21.5 mm, and a non-bonding interface with a depth Z of 9. The distance Y from the center O was 2 mm and 53.25 mm. The non-bonding interface is in a state where a scale exists.

Example 4
In this example, a vibration damping material for mechanical parts (sample E4) was produced as an example of the present invention.
In this example, normalization and shot blasting in Example 3 are omitted. Others were performed in the same manner as in Example 3.
The vibration damping material for mechanical parts (sample E4) obtained in this example has an outer diameter S of 122 mm, an inner diameter T of 104 mm, a thickness U of 21.5 mm, and a non-bonding interface with a depth Z of 9. The distance Y from the center O was 2 mm and 53.25 mm. And the non-bonding interface is in a state without scale.

(Example 5)
In this example, a vibration damping material for machine parts (sample E5) was produced as an example of the present invention.
This example is an example in which the depth of the groove portion in the first embodiment is changed. The groove portion of the sample E3 has a distance L from the center O of 41.2 mm, a width W of 2 mm, and a depth X of 15 mm. Others were performed in the same manner as in Example 1.
The vibration damping material for mechanical parts (sample E5) obtained in this example has an outer diameter S of 122 mm, an inner diameter T of 104 mm, a thickness U of 21.5 mm, and a non-bonding interface with a depth Z of 13. The distance Y from the center O was 8 mm and 53.25 mm. The non-bonding interface is in a state where a scale exists.

(Example 6)
In this example, a vibration damping material for machine parts (sample E6) was produced as an example of the present invention.
In this example, normalization and shot blasting in Example 5 are omitted. The other operations were performed in the same manner as in Example 5.
The vibration damping material for mechanical parts (sample E6) obtained in this example has an outer diameter S of 122 mm, an inner diameter T of 104 mm, a thickness U of 21.5 mm, and a non-bonding interface with a depth Z of 13. The distance Y from the center O was 8 mm and 53.25 mm. And the non-bonding interface is in a state without scale.

(Example 7)
In this example, the vibration damping performance of the vibration damping materials for machine parts (samples E1 to E6) produced in Examples 1 to 6 was evaluated.
As shown in FIG. 4, the vibration damping evaluation is performed by suspending the produced vibration damping material 1 for machine parts with a wire 5 and vibrating the outer diameter end B with a hammer. It was done by the method of measuring. Then, the logarithmic damping rate was calculated from the obtained vibration waveform, and the improvement level of the damping performance was evaluated based on the calculated value. The results are also shown in Table 1.

  For comparison, as shown in FIG. 5, a non-roller manufactured by performing ring rolling on a ring-shaped material 61 (FIG. 5A) having the same specifications using the same material (SCM420H). A ring-shaped material of the same specification using a material 62 for machine parts without a bonding interface (FIG. 5B, sample C1) and spheroidal graphite cast iron FCD500, which is known to have superior vibration damping properties compared to steel. On the other hand, a machine part material (sample C2) having no non-bonding interface produced by ring rolling was produced, and the vibration damping property was similarly evaluated.

As is apparent from Table 1, the specimens (sample E1 to sample E6) having a non-bonded interface introduced into the material have a logarithmic attenuation that is significantly higher than that of the conventional material (sample C1) having no non-bonded interface. It can be seen that the vibration damping performance is greatly improved by the generation of a non-bonded interface. In particular, it can be seen that as the depth of the non-bonded interface is increased and the area of the interface is increased, the vibration damping property is improved.
In addition, the effect of the present invention is extremely large even when compared with FCD500 (sample C2), which is one of the spheroidal graphite cast irons that has been said to have superior vibration damping properties compared to steel. Was confirmed.

(Example 8)
In this example, the mechanical part damping material 1 (sample E1) obtained in Example 1 was processed to produce the gear 11 that is an actual part.
The gear 11 was produced by gearing the outer periphery of the sample E1.
As shown in FIG. 6, the gear 11 has a shaft portion 12 and has a constant thickness up to the tooth profile forming region C on the outer periphery. The tip diameter g was 114 mm, the tooth width h was 20 mm, the module was 1, and the number of teeth was 112.
Although not shown in Table 1 for the gear 11 of this example, it was confirmed that the vibration damping effect was obtained in the same manner as the sample E1.

Example 9
In actual gears, carburizing is often performed to satisfy the required strength. Therefore, in this example, carburizing treatment was performed on the gear 11 produced in Example 8 above.
Using the gear 11 obtained in Example 8 as it was, carburizing treatment of 930 ° C. × 4 hr was performed.
When the gear 11 was evaluated for vibration damping properties, there was no carburizing effect and the same vibration damping effect as before carburizing was obtained. From this result, it was confirmed that a great vibration damping improvement effect was obtained similarly to the sample E1 regardless of the presence or absence of carburization.

  In Examples 1 to 6, all the shapes of the non-bonding interfaces were circular in order to facilitate the experiment. However, in the present invention, the non-bonded interface is not limited to a circular shape as long as the vibration damping property is improved, and other shapes can of course be used.

  For example, as shown in FIG. 7 and FIG. 8, when assuming a vibration damping material for machine parts or a disk-like member as a machine part, regular polygonal non-bonding interfaces 71 and 72 can be formed. Further, as shown in FIGS. 9 and 10, non-bonding interfaces 73 and 74 having a polygonal shape with unequal sides which are asymmetrical may be used. Examples of other non-bonding interface shapes are shown in FIGS. FIG. 11 shows an example in which a non-bonding interface 75 is provided in a square spline shape. FIG. 12 is an example in which a non-bonding interface 76 is provided in an involute spline shape. FIG. 13 shows an example in which a non-bonding interface 77 is provided in a serrated shape.

Further, as shown in FIGS. 9 and 10, when non-equal polygonal non-bonding interfaces 73, 74, etc. are adopted, the vibration damping property is improved as compared with the case of the equilateral polygon for the following reason. it is conceivable that.
That is, when teeth are formed at equal intervals on the inner diameter side or outer diameter side as in a gear, the meshing of the gear pair has a specific frequency according to the rotation frequency and the number of teeth. Similarly, torque is generated at a specific frequency. In the case of an equilateral polygonal non-bonded interface, the vibration damping effect can be reduced because the non-bonded interface receives the torque and vibration periodically transmitted from the meshing tooth surface at a cycle corresponding to the number of angles. There is sex. On the other hand, if the interface is an unequal side, the vibration-damping interface has an indefinite period, so that the vibration suppression effect can be further improved in an actual gear driving environment.

FIG. 3 is an explanatory view showing a ring-shaped material in Example 1. Explanatory drawing which shows the damping material for machine parts in Example 1. FIG. FIG. 3 is an explanatory diagram showing ring rolling processing in the first embodiment. Explanatory drawing which shows the vibration position at the time of vibration damping evaluation in Example 7. FIG. Explanatory drawing which shows the raw material for machine parts in Example 7 without a nonbonding interface. Explanatory drawing which shows the spur gear in Example 8. FIG. Explanatory drawing which shows an example of the shape of a non-bonding interface. Explanatory drawing which shows an example of the shape of a non-bonding interface. Explanatory drawing which shows an example of the shape of a non-bonding interface. Explanatory drawing which shows an example of the shape of a non-bonding interface. Explanatory drawing which shows an example of the shape of a non-bonding interface. Explanatory drawing which shows an example of the shape of a non-bonding interface. Explanatory drawing which shows an example of the shape of a non-bonding interface.

Explanation of symbols

2 Material 21 Groove

Claims (10)

  Formed by a method of applying plastic working by ring rolling processing, in which a ring-shaped material having a groove formed by plastic working and / or machining is stretched in the radial direction and rolled in a direction to reduce the space in the groove. A vibration damping material for a machine part, characterized by having a non-bonding interface that is in contact without metallic bonding.   2. The vibration damping material for a machine part according to claim 1, wherein the non-bonding interface is formed from the surface to a predetermined depth inside and does not penetrate.   3. The vibration damping material for a machine part according to claim 2, wherein the length in the depth direction of the non-bonding interface is 20% or more of the thickness dimension in the same direction.   4. The mechanical component damping material according to claim 1, wherein the mechanical component damping material is a gear damping material for forming a gear having damping characteristics, and a ring-shaped main body portion and an outer peripheral side surface thereof. Or it has a tooth-form formation scheduled part provided in the inner peripheral side surface, and the non-bonding interface is formed from at least one end face in the axial direction of the body part. .   5. The vibration damping material for a machine part according to claim 1, wherein the non-bonding interface is formed in an annular shape.   6. The vibration damping material for machine parts according to claim 5, wherein the non-bonding interface is formed in a circular shape.   7. The vibration damping material for machine parts according to claim 6, wherein the non-bonding interface is formed in an asymmetric shape. A method of manufacturing a damping material for a machine part having a non-bonding interface that is in contact without being metallically bonded,
A groove portion forming step of forming a ring-shaped material having a groove portion that becomes a non-bonding interface on the surface by plastic working and / or machining;
Ring rolling that forms the non-bonding interface by applying plastic working by ring rolling working to stretch the material in the radial direction and rolling in a direction to reduce the space in the groove, and bringing the facing inner wall surfaces into contact with each other And a process for producing a vibration damping material for mechanical parts.   The method for manufacturing a vibration damping material for a machine part according to claim 9, wherein the groove forming step is performed by forging using a mold having a protrusion corresponding to the groove.   A machine part produced by processing the vibration damping material for machine part according to any one of claims 1 to 8.

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