JP2013133511A - Titanium material and rolling device including the titanium material in its member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To find a novel manufacturing condition for mass-producing a titanium material with a new phase stably and cost-effectively.SOLUTION: The titanium material has undergone the solution treatment and the aging treatment, wherein the total treatment time including the solution treatment and the aging treatment is within 160 hours, the titanium material has a new phase in which a diffraction spot exists on an electron diffraction pattern obtained by the electron microscopy at a position offset from a virtual line connecting between substantial centers of adjacent parent phases, and the diffraction spot of an ω phase does not exist at a position on the virtual line.

Description

  The present invention relates to a titanium material and a rolling device including the titanium material as a constituent member.

  It has been conventionally known that titanium materials are generally classified into pure titanium, α-type titanium alloy, α + β-type titanium alloy, and β-type titanium alloy. Of these, pure titanium is a dense hexagonal crystal (α phase) at room temperature, but undergoes an allotropic transformation (also referred to as a phase transformation) to a body-centered cubic crystal (β phase) at about 885 ° C. When an alloy element is added to such pure titanium, the β transformation point changes depending on the type and amount of the element, and a two-phase region called an α phase and a β phase appears. Even when alloyed, an α-type titanium alloy is generally called α-type titanium alloy and an α-β type titanium alloy is one having two phases of α-phase and β-phase at room temperature. In addition, an alloy that can be converted into a β single phase purely by quenching from a temperature equal to or higher than the β transformation point is called a β-type titanium alloy.

  Titanium materials as described above are superior in specific strength (= tensile strength / specific gravity) compared to steel materials, and have been used in fields such as aviation, military, space, and ocean exploration since ancient times. In particular, the β-type titanium alloy is an excellent material having both high strength, light weight, and corrosion resistance, so its use is widespread. Recently, biomaterials such as artificial bones, accessories such as eyeglass frames, sports such as golf clubs, etc. The field of use is expanding to supplies.

  However, because the β-phase titanium alloy is unstable in the β-type titanium alloy, it causes martensitic transformation by rapid cooling, or a metastable phase called ω-phase precipitates due to rapid cooling or aging, causing hardening and embrittlement. There was such a problem. Here, the ω phase is a phase having a hexagonal crystal structure and coexists on a continuous crystal lattice together with a β phase having a body-centered cubic crystal structure. The manifestation of the ω phase transformation in the titanium alloy affects the physical properties such as strength, toughness and electrical resistance of the titanium alloy. Moreover, since the β phase is relatively soft and the ω phase is very hard, the coexistence structure of these two phases defines the strength of the entire system.

  The inventors have discovered a new structure-undetermined phase (hereinafter referred to as “new phase”) that has not been known in the past in research for elucidating the ω-phase transformation mechanism. In other words, the inventors combined a transmission electron microscope (TEM) with electron energy loss spectroscopy (EELS) in order to obtain an electronic theory about the ω phase transformation. -EELS (hereinafter, simply referred to as “electron microscopy”) was used to collect data for quantitative evaluation of changes in the electronic state density of the parent phase and the ω phase as the transformation progressed. In the aging process of the aging method, a new precipitation form of the titanium material has been observed. Specifically, in the conventional theory, it was considered that the phase transformation of “β-ω-α” proceeds, but depending on the aging conditions, it was confirmed that a new phase appears (see the following patent document). 1).

  Here, in order to explain the difference between the newly discovered new phase and the ω phase, referring to FIG. 1 and FIG. 2 of Patent Document 1 below, FIG. In FIG. 2, the spots with large intensity located at the four corners of the electron diffraction pattern indicate the spots of the β phase (11) which is the parent phase. And the small spot in FIG. 1 in the following Patent Document 1 indicates the ω phase (12), and the conventionally known diffracted spot of the ω phase (12) is β adjacent to the diagonal on the electron diffraction pattern. Appears at a position overlapping the imaginary line (I) connecting the approximate centers of the diffraction spots of the phase (11), and is one-third and two-thirds the length of the imaginary line (I). It is known to appear at the position of.

  On the other hand, the small spot in FIG. 2 in the following Patent Document 1 indicates a new phase (22) discovered by the inventors. This new phase (22) is confirmed to appear at a position deviated from the virtual line (II) connecting the approximate centers of the diffraction spots of the β phase (11) diagonally adjacent on the electron diffraction pattern. ing.

  In addition, it was confirmed that the new phase (22) had almost the same hardness as the ω phase (12) and had excellent ductility. Therefore, as a result of intensive research on the new phase (22), the inventors have clarified the transformation process of the ω phase (12) and the new phase (22), and stabilized the titanium material having the new phase (22). We succeeded in finding the manufacturing conditions that can be produced.

JP 2011-174120 A (FIGS. 1 and 2)

  However, there remains room for improvement in the production conditions of the titanium material having the new phase (22) disclosed in Patent Document 1 listed above. That is, in mass production of a new titanium material having the new phase (22) in a production line such as a factory, the new phase (22) is stably precipitated and the ω phase (12) is surely lost. It is essential to establish manufacturing conditions that can be used. It is also necessary to find more preferable manufacturing conditions in terms of manufacturing cost reduction such as shortening of manufacturing time.

  Specifically, at the time when the inventors discovered the new phase (22), only production conditions requiring a minimum aging time of about 40 hrs and a long aging time of 400 hrs or more were found. Therefore, if the conditions for producing a titanium material having a new phase (22) stably and reliably in a short processing time can be found, the utility value of the titanium material having a new phase (22) will be dramatically expanded. Can be expected. In particular, if a technology capable of stably mass-producing a titanium material having a new phase (22) having high hardness while eliminating the problem of embrittlement that the ω phase (12) had, a high reliability can be established. It is possible to apply a titanium material having this new phase (22) to a rolling sliding member that requires high performance, and it is possible to provide a rolling device having a suitable performance that has not existed in the past. .

  The present invention has been made in view of the existence of the problems as described above, and the object thereof is a new titanium material having a new phase found by the inventors, which can be mass-produced stably and inexpensively. Finding manufacturing conditions.

  The titanium material according to the present invention is a titanium material subjected to solution treatment and aging treatment, and the total treatment time including the solution treatment and the aging treatment is within 160 hrs, and was obtained by electron microscopy. On the electron diffraction pattern, there is a new phase where a diffraction spot exists at a position deviating from a virtual line connecting the approximate centers of the diffraction spots of adjacent matrix phases, and there is no diffraction spot of the ω phase at a position on the virtual line. It is characterized by this.

  In addition, the rolling device according to the present invention includes an inner member having a raceway surface on an outer surface and a raceway surface facing the raceway surface of the inner member, and is disposed on the outer side of the inner member. A rolling device comprising a member and a rolling element that is freely rollable between the both raceway surfaces, wherein at least one of the inner member, the outer member, and the rolling element is It is characterized by comprising the following titanium material.

  According to the present invention, a titanium material having a new phase found by the inventors and a rolling device including the titanium material as a constituent member can be mass-produced stably and inexpensively.

It is a process pattern figure which shows the new manufacturing conditions of the titanium material which concerns on this invention. In order to verify three conditions with different cooling rates, cooling using oil as a cooling medium in the first embodiment, cooling using water as a cooling medium in the second embodiment, and comparative examples It is the figure which measured the time until a new phase precipitates in each cooling condition, when performing atmospheric cooling at room temperature without using a certain cooling medium. It is the figure shown in order to clarify the total average particle diameter for every cooling medium among the results shown by Table 1. FIG. It is a micro photograph at the time of performing the atmospheric cooling at room temperature which does not use the cooling medium which is a comparative example of this invention. It is a micro photograph at the time of performing the atmospheric cooling at room temperature which does not use the cooling medium which is a comparative example of this invention. It is a micro photograph at the time of using oil as a cooling medium which is the 1st example of the present invention. It is a micro photograph at the time of using oil as a cooling medium which is the 1st example of the present invention. It is a micro photograph at the time of using oil as a cooling medium which is the 1st example of the present invention. It is a micro photograph at the time of using water as a cooling medium which is the 2nd example of the present invention. It is a micro photograph at the time of using water as a cooling medium which is the 2nd example of the present invention. It is a micro photograph at the time of using water as a cooling medium which is the 2nd example of the present invention. It is an external appearance perspective view which illustrates one form of the linear guide apparatus which concerns on this embodiment comprised by the rolling sliding member which consists of titanium materials. It is sectional drawing for demonstrating the infinite circuit provided with the linear guide apparatus shown to FIG. 7A. It is a figure which illustrates the case where the rolling device concerning this embodiment is constituted as a ball screw device. It is a figure which illustrates the case where the rolling device concerning this embodiment is constituted as a spline device. It is a partial longitudinal section perspective view which illustrates one form at the time of constituting the rolling device concerning this embodiment as a rotation bearing device. It is a figure which shows the longitudinal cross-section of the rotation bearing apparatus shown to FIG. 10A. It is an appearance perspective view which illustrates one form at the time of constituting the rolling device concerning this embodiment as a slide screw device. It is a figure for demonstrating the various application examples of this invention, and is an external appearance perspective fragmentary sectional view which shows the rolling device of the type which combined the linear motion guide and the ball screw into the integral structure.

  As a result of diligent research to solve the above-mentioned problems, the inventors have succeeded in finding a production condition capable of mass-producing a titanium material having a new phase stably and inexpensively. Therefore, in the embodiment described below, the manufacturing conditions found by the inventors and the analysis results indicating the characteristics of the titanium material having a new phase manufactured under the manufacturing conditions will be described.

  The inventors set the object of the experiment to find production conditions that can ensure a Vickers hardness Hv of at least 400 or more when a new phase appears and the ω phase disappears. The experimental sample employed in this experiment is a high formability and high strength titanium alloy known as a steel type name KS15-3-3-3, and the outer shape of the experimental sample is, for example, a donut shape.

  That is, this experiment prepares an experimental sample made of KS15-3-3-3 having an outer shape made of the above-mentioned donut shape, and performs various treatments on the experimental sample, and performs Vickers hardness for each arbitrary processing condition. By confirming Hv and observing an electron diffraction pattern obtained by electron microscopy, the Vickers hardness Hv can be ensured to be at least 400 or more, and the condition that the ω phase disappears and a new phase precipitates is found. Made in

In addition, about the physical property of KS15-3-3-3, a composition is Ti-15V-3Cr-3Sn-3Al, a density is 4.76 g / cm < ³ >, and (beta) transformation temperature is 760 degreeC. The thickness W of the experimental sample was 0.6 mm.

  Next, preferred production conditions found by the above experiment are shown in FIG. FIG. 1 shows new production conditions that allow stable and inexpensive mass production of a titanium material according to the present invention in which the ω phase disappears as the new phase appears and the Vickers hardness Hv is at least 400 or more. It is the process pattern figure shown. In the graph shown in FIG. 1, the horizontal axis represents the processing time (hrs) and the vertical axis represents the temperature (° C.).

  According to experiments by the inventors, a processing temperature of 760 ° C. or higher which is a β transformation temperature, for example, a processing temperature of about 1000 ° C. is maintained for about 1 hrs, and then is cooled to room temperature at a cooling rate of 30 ° C./sec or higher. A solution treatment for cooling was carried out, and then an aging treatment at a treatment temperature of 300 to 500 ° C. and an aging time of 20 hrs or more was performed, whereby the Vickers hardness Hv was 400 or more, and further obtained by electron microscopy. Titanium that has a new phase with diffraction spots at positions deviating from the imaginary line connecting the approximate centers of diffraction spots of adjacent matrix phases on the electron diffraction pattern, and has no ω-phase diffraction spots at positions on the imaginary line It became clear that the material can be manufactured stably and reliably. Further, in the case of the manufacturing conditions shown in FIG. 1, the total processing time required for manufacturing the titanium material according to the present invention can be set to a minimum of about 40 hrs and a maximum of about 160 hrs. Became clear.

  In addition, the following matters can be grasped from the manufacturing conditions of the titanium material found by the inventors. That is, in the experiments by the inventors, the treatment temperature of the aging treatment is set to 300 to 500 ° C., but when the treatment temperature of the aging treatment does not exceed 300 ° C., it has been clarified that no new phase is precipitated. In addition, when the aging treatment temperature exceeded 500 ° C., it became clear that a ω phase that was not a new phase was precipitated. Further, in the experiments by the inventors, the aging time of the aging treatment is set to 20 hrs or more. However, when the aging time of the aging treatment is shorter than 20 hrs, it is clear that the ω phase is likely to precipitate. It was. Furthermore, in the experiments conducted by the inventors, the total processing time including the solution treatment and the aging treatment is within about 160 hrs at the maximum, but the total processing time including the solution treatment and the aging treatment exceeds about 160 hrs. It became clear that there was a concern about the coarsening of Ti particles. In addition, the longer total processing time leads to higher costs, so that the present invention, which has a shorter total processing time than the prior art, is superior in cost to the prior art. It became clear.

  Moreover, the inventors decided to confirm which conditions among the processing patterns shown in FIG. 1 favorably contribute to the production of the titanium material according to the present invention. And as shown in FIG. 2, it discovered that the cooling rate in the case of the cooling implemented by solution treatment was conditions which contribute in order to manufacture the titanium material which concerns on this invention stably and reliably. That is, FIG. 2 uses cooling using oil as a cooling medium according to the first embodiment and water as a cooling medium according to the second embodiment in order to verify three conditions with different cooling rates. It is the figure which measured time until a new phase precipitates in each cooling condition, when cooling and the atmospheric cooling at room temperature which does not use the cooling medium which is a comparative example are performed. In FIG. 2, the horizontal axis represents total processing time (hrs), and the vertical axis represents Vickers hardness (Hv).

  In this experiment, the cooling rate when water is used as the cooling medium according to the second embodiment is 95.0 ° C./sec, and the cooling speed when oil is used as the cooling medium according to the first embodiment is 30 The cooling rate was 1.9 ° C./sec when air cooling was performed at room temperature without using a cooling medium as a comparative example. As shown in FIG. 2, the total processing time until the new phase precipitates under each condition (total processing time including solution treatment and aging treatment) is water as a cooling medium in the second embodiment. When it is used, it is about 40 hrs, and when oil is used as the cooling medium of the first embodiment, it is about 160 hrs, whereas when air cooling is performed at room temperature without using the cooling medium of the comparative example Then, it was about 400 hrs.

  From this, it has confirmed that the cooling rate in the case of the cooling implemented by solution treatment is the conditions which contribute in order to manufacture the titanium material which concerns on this invention stably and reliably. In the experiment shown in FIG. 2, the shortest total processing time (total processing time including solution treatment and aging treatment) until the new phase is precipitated is that water is used as the cooling medium in the second embodiment. However, it is also possible to use a cooling medium capable of further increasing the cooling rate, such as ice water, for the titanium material manufacturing method according to the present embodiment.

  Furthermore, the inventors have examined the influence of each cooling condition on the crystal grain size in order to confirm the difference in the structure of the structure that appears in the titanium material itself when the titanium material is manufactured under three conditions with different cooling rates. confirmed. The results are shown in Table 1. In this experiment, an experimental sample immediately after completion of the solution treatment after cooling was embedded in a resin, and the experimental sample embedded in the resin was mirror-finished by polishing to form an observation surface. It was done by micro observation. The average number of particles can be obtained by observing a crystal structure photograph taken with a microscope field of view and measuring the number of crystal grains, and the average particle size is the number of crystal grains observed in the microscope field of view area. The total average particle diameter is calculated by obtaining an average value of the average particle diameters calculated by a plurality of observations.

  Among the results shown in Table 1, FIG. 3 is shown in order to clarify the total average particle size for each cooling medium. As is clear from FIG. 3, the average grain size of the titanium material crystal grains when the solution treatment is performed using oil as the cooling medium according to the first embodiment is 80 to 141 μm. The result that the average particle diameter becomes larger than the case of some air cooling was obtained. In addition, the titanium material when the solution treatment is performed using water as the cooling medium according to the second embodiment has an average crystal grain size of 111 to 200 μm, which is the most compared with other cooling conditions. It was confirmed that the crystal grain size was increased. This means that when an average grain size of crystal grains is 80 to 200 μm and a titanium material in which a new phase is precipitated while the ω phase disappears is found, the titanium material is included in this embodiment. It shows that it can be recognized that it was manufactured using such a manufacturing method.

  Further, the following matters can be grasped from the condition value that the average grain size of the titanium material crystal grains found by the inventors is 80 to 200 μm. That is, it has been clarified that when the average grain size of the titanium material crystal grains is smaller than 80 μm, the precipitation time of the new phase is prolonged. Further, when the average grain size of the crystal grain of the titanium material is larger than 200 μm, it is expected that the embrittlement proceeds. Therefore, if the average grain size of the titanium material crystal grain found by the inventors satisfies the condition value of 80 to 200 μm, the present invention can be used as a rolling sliding member that will receive at least repeated rolling loads and sliding loads. It is clear that the titanium material according to the invention can be suitably used.

  In addition, the photograph in which micro observation with the microscope used as the basis of the experimental data shown in Table 1 is shown to FIG. 4A-FIG. 6C. Incidentally, FIGS. 4A and 4B are microphotographs when air cooling is performed at room temperature without using a cooling medium as a comparative example, and FIGS. 5A to 5C are oils as a cooling medium according to the first embodiment. 6A to 6C are microphotographs when water is used as a cooling medium according to the second embodiment. As shown in the microphotographs of FIGS. 4A to 6C, the treatment in the case of using water and oil as the cooling medium according to the method of the present invention is compared with the case of atmospheric cooling as a comparative example. It is apparent that the average grain size of the crystal grains of the titanium material is increased.

  In the above, the suitable manufacturing conditions for the titanium material according to the present embodiment found by the inventors have been described. In addition, since the titanium material which concerns on this embodiment precipitated the new phase, eliminating the omega phase, it has improved brittleness while having high hardness. In addition, the present inventors believe that the reason why high hardness is obtained even when the ω phase disappears and a new phase appears is due to the cooperative action of the new phase and the α phase. From the above, the titanium material according to the present embodiment can be suitably used as a rolling sliding member that receives repeated rolling loads and sliding loads. Then, next, the example at the time of applying the titanium material which concerns on this embodiment to a rolling device is demonstrated.

[Example of application to rolling devices]
A specific embodiment of a rolling device using a titanium material according to this embodiment as a rolling sliding member will be described with reference to the drawings. Note that the embodiments of the rolling device exemplified below do not limit the invention according to each claim, and all combinations of features described in the embodiments are essential to the solution means of the invention. Not necessarily. In addition, the “rolling device” in the present specification includes, for example, rolling bearings used in machine tools and the like, non-lubricated bearings used in vacuum, linear guides and linear guide devices, ball spline devices, ball screw devices, It includes devices with various rolling / sliding operations such as roller screw devices and cross roller rings.

(Application example to linear guide device)
The rolling device according to the present embodiment can be configured as a linear guide device as shown in FIGS. 7A and 7B, and by forming the linear guide device with the titanium material described above, high strength and light weight can be achieved. It is possible to realize an excellent rolling device having the significant characteristics of titanium materials such as property and corrosion resistance. Here, FIG. 7A is an external perspective view illustrating one embodiment of the linear guide device according to this embodiment configured of a titanium material. Moreover, FIG. 7B is sectional drawing for demonstrating the infinite circuit with which the linear guide apparatus shown in FIG. 7A is provided.

  First, the configuration of the linear guide device 40 illustrated in FIGS. 7A and 7B will be described. The linear guide device 40 as a rolling device according to the present embodiment includes a track rail 41 as an inner member, and a track rail 41. And a moving block 43 as an outer member slidably mounted via balls 42... Installed as a number of rolling elements. The track rail 41 is a long member whose cross section perpendicular to the longitudinal direction is formed in a substantially rectangular shape, and the surface (upper surface and both side surfaces) of the track rail 41 is a track surface that becomes a track when the balls 42 roll. Are formed over the entire length of the track rail 41.

  Here, the track rail 41 may be formed to extend linearly, or may be formed to extend in a curved manner. 7A and 7B, the number of rolling element rolling surfaces 41a... Is two in total on the left and right, and a total of four is provided. Can be changed.

  On the other hand, the moving block 43 is provided with a loaded rolling element rolling surface 43a as a raceway surface at a position corresponding to each of the rolling element rolling surfaces 41a. The rolling element rolling surfaces 41a of the track rail 41 and the loaded rolling element rolling surfaces 43a of the moving block 43 form a load rolling path 52, and a plurality of balls 42 are sandwiched therebetween. Further, the moving block 43 includes four unloaded rolling paths 53 extending in parallel with the rolling element rolling surfaces 41a, and a direction change connecting the unloaded rolling paths 53 and the loaded rolling paths 52. Paths 55 are provided. One endless circulation path is constituted by a combination of one load rolling path 52 and no-load rolling path 53 and a pair of direction changing paths 55 connecting them (see FIG. 7B).

  A plurality of balls 42 are installed in an infinite circulation path composed of a load rolling path 52, a no-load rolling path 53, and a pair of direction changing paths 55, 55 so that infinite circulation is possible. Is reciprocally movable relative to the track rail 41.

  In the linear guide device 40 according to this embodiment having the above-described configuration, the track rail 41 as an inner member, the moving block 43 as an outer member, and balls 42 installed as a plurality of rolling elements ... At least one of the above can be made of the titanium material according to the above-described embodiment.

  In the linear guide device 40 according to the present embodiment, all the constituent members can be made of a titanium material, or some of the constituent members can be made of a titanium material. This selection may be performed according to the usage environment of the linear guide device 40 or the like.

(Application example to rolling element screw device)
Further, the rolling device according to the present embodiment can be configured as a ball screw device 56 as shown in FIG. 8, for example. FIG. 8 is a diagram illustrating a case where the rolling device according to this embodiment is configured as a ball screw device. The ball screw device 56 is a device including a screw shaft 57 as an inner member and a nut member 59 as an outer member attached to the screw shaft 57 via a plurality of balls 58 so as to be relatively rotatable. .

  The screw shaft 57 is an inner member in which a rolling element rolling groove 57a as a spiral raceway surface is formed on the outer peripheral surface, while the nut member 59 corresponds to the rolling element rolling groove 57a on the inner peripheral surface. It is an outward member in which a load rolling groove is formed as a spiral raceway surface. As the screw shaft 57 rotates relative to the nut member 59, the nut member 59 can reciprocate relative to the screw shaft 57.

  The screw shaft 57, the nut member 59, the ball 58, and other members constituting the ball screw device 56 can be made of the titanium material of the present invention. By configuring the ball screw device 56 in this way, it is possible to realize an excellent ball screw device 56 having, for example, significant characteristics of a titanium material such as high strength, light weight, and corrosion resistance.

(Application example to spline device)
Furthermore, the rolling device according to the present embodiment can be configured as, for example, a spline device 60 as shown in FIG. FIG. 9 is a diagram illustrating a case where the rolling device according to this embodiment is configured as a spline device.

  Here, the configuration of the spline device 60 shown in FIG. 9 will be briefly described. The spline device 60 includes a spline shaft 61 as an inward member and a plurality of balls 62 as rolling elements on the spline shaft 61. And a cylindrical outer cylinder 63 as an outer member attached movably. On the surface of the spline shaft 61, rolling element rolling surfaces 61a are formed as raceways for the balls 62 and extending in the axial direction of the spline shaft 21. The outer cylinder 63 attached to the spline shaft 61 is formed with a loaded rolling element rolling surface as a raceway surface corresponding to the rolling element rolling surface 61a. A plurality of protrusions extending in the direction in which the rolling element rolling surfaces 61a... Extend are formed on these loaded rolling element rolling surfaces. A load rolling path is formed between the loaded rolling element rolling surface formed on the outer cylinder 63 and the rolling element rolling surface 61 a formed on the spline shaft 61. Next to the load rolling path, a no-load return passage is formed in which the balls 62 released from the load move. The outer cylinder 63 incorporates a cage 64 for aligning and holding a plurality of balls 62 in a circuit shape. A plurality of balls 62 are installed so as to roll freely between the loaded rolling element rolling surface of the outer cylinder 63 and the rolling element rolling surface 61a of the spline shaft 61, and are infinitely circulated through the no-load return passage. Thus, the outer cylinder 63 can reciprocate relative to the spline shaft 61.

  Even in the case of the spline device 60 shown in FIG. 9, the spline shaft 61, the outer cylinder 63, the ball 62, and other members constituting the spline device 60 can be formed of the titanium material according to the present embodiment. . By configuring the spline device 60 in this way, it is possible to realize an excellent spline device 60 having, for example, significant characteristics of a titanium material such as high strength, light weight, and corrosion resistance.

(Application example to rotating bearing device)
Furthermore, the rolling device according to the present embodiment can be configured as a rotary bearing device 70 as shown in FIGS. 10A and 10B, for example. Here, FIG. 10A is a partially longitudinal perspective view illustrating an example of a case where the rolling device according to this embodiment is configured as a rotary bearing device. Moreover, FIG. 10B is a figure which shows the longitudinal cross-section of the rotation bearing apparatus shown to FIG. 10A.

  As shown in FIGS. 10A and 10B, the rolling device configured as the rotary bearing device 70 has an inner raceway surface 72 (as an inner member or an outer member) having an inner raceway surface 72 having a V-shaped cross section on the outer peripheral surface. And an outer race 73 (as an outer member or an inner member) having an outer raceway surface 74 having a V-shaped cross section on the inner circumferential surface, an inner raceway surface 72 and an outer raceway surface 74, and a substantially rectangular cross section. The inner ring 71 and the outer ring 73 perform a relative rotational movement in the circumferential direction by having a plurality of rollers 77 as rolling elements that are cross-arranged between the raceway paths 75.

  By configuring the member constituting the rotary bearing device 70 with the titanium material according to the present embodiment, for example, an excellent rotary bearing device having significant characteristics of the titanium material such as high strength, light weight, and corrosion resistance. 70 can be realized.

(Application example for sliding screw device)
About each apparatus mentioned above, the apparatus of the form with which the some rolling element was interposed between the inner member and the outer member was illustrated and demonstrated. However, the scope of application of the present invention, which is characterized in that the rolling device is constituted by a titanium material, is not limited to the one using such a rolling element, and the inner member and the outer member can be arranged without using the rolling element. The present invention can also be suitably used for an apparatus configured to be in direct contact and capable of relative movement.

  For example, as shown in FIG. 11, the present invention can be applied to a rolling device configured as a sliding screw device 80. Here, FIG. 11 is an external perspective view illustrating an example when the rolling device according to this embodiment is configured as a sliding screw device. A sliding screw device 80 shown in FIG. 11 includes a screw shaft 81 as an inner member in which a screw groove as a spiral raceway surface is formed on the outer peripheral surface, and a helical screw corresponding to the screw groove on the inner peripheral surface. And a nut member 83 as an outer member in which a nut groove as a raceway surface is formed, so that the nut member 83 is attached to the screw shaft 81 as the screw shaft 81 rotates relative to the nut member 83. It is comprised so that it can reciprocate relatively with respect to it.

  Moreover, also about the sliding screw apparatus 80 shown in FIG. 11, either or all of the screw shaft 81 and the nut member 83 which are the structural members can be comprised with the titanium material which concerns on this embodiment. By constituting the members constituting such a sliding screw device 80 with a titanium material, an excellent sliding screw device 80 having, for example, significant characteristics of a titanium material such as high strength, light weight, and corrosion resistance is realized. be able to.

  As mentioned above, although preferred embodiment of this invention was described, the technical scope of this invention is not limited to the range as described in the said embodiment. Various modifications or improvements can be added to the embodiment.

  For example, the present invention can be applied to a rolling device 90 of a type in which a linear motion guide and a ball screw are combined to form an integral structure as shown in FIG. In the case of the rolling device 90 shown in FIG. 12, the screw shaft 91 and the moving block 93 are installed via a plurality of balls 95. It is also possible to configure the moving block 93 as a sliding screw.

  Moreover, in this embodiment, although the experimental result performed using KS15-3-3-3 which is a Ti-15V-3Cr-3Sn-3Al type titanium alloy was shown, the titanium material of this invention has other Types of titanium alloys can be included. For example, even if the present inventors are Ti-14Mo alloy, Ti-20Mo alloy, SP-700 titanium alloy or the like, the manufacturing conditions described above, that is, the total processing time including solution treatment and aging treatment is 40 hrs. It is confirmed that the ω phase can be eliminated and a new phase can be precipitated.

  It is apparent from the description of the scope of claims that embodiments with such changes or improvements can be included in the technical scope of the present invention.

  40 linear guide device, 41 track rail, 41a rolling element rolling surface, 42 balls, 43 moving block, 43a loaded rolling element rolling surface, 48, 49 screw hole, 52 loaded rolling path, 53 unloaded rolling path, 55 directions Conversion path, 56 Ball screw device, 57 Screw shaft, 57a Rolling element rolling groove, 58 Ball, 59 Nut member, 60 Spline device, 61 Spline shaft, 61a Rolling element rolling surface, 62 Ball, 63 Outer cylinder, 64 Holding , 70 Rotating bearing device, 71 Inner ring, 72 Inner raceway surface, 73 Outer ring, 74 Outer raceway surface, 75 Trackway, 77 Roller, 80 Sliding screw device, 81 Screw shaft, 83 Nut member, 90 Rolling device, 91 Screw Axle, 93 moving block, 95 balls.

Claims (6)

In titanium materials that have undergone solution treatment and aging treatment,
The total processing time including the solution treatment and the aging treatment is within 160 hrs,
An electron diffraction pattern obtained by electron microscopy has a new phase in which diffraction spots exist at positions deviating from the imaginary line connecting the approximate centers of diffraction spots of adjacent matrix phases, and ω at the position on the imaginary line. A titanium material characterized by the absence of phase diffraction spots. The titanium material according to claim 1,
A titanium material, which is subjected to a solution treatment for cooling to a normal temperature at a cooling rate of 30 ° C./sec or higher from a processing temperature equal to or higher than a β transformation temperature. In the titanium material according to claim 1 or 2,
A titanium material having a Vickers hardness Hv of 400 or more by being subjected to an aging treatment at a treatment temperature of 300 to 500 ° C. In the titanium material according to any one of claims 1 to 3,
A titanium material having an average particle size of 80 to 200 μm. In the titanium material according to any one of claims 1 to 4,
A titanium material characterized by being used as a rolling sliding member in which relative rolling contact or sliding contact occurs with a counterpart member. An inner member having a raceway surface on the outer surface;
An outer member having a raceway surface facing the raceway surface of the inner member and disposed outside the inner member;
A rolling element disposed so as to be freely rollable between the two raceway surfaces;
In a rolling device comprising:
The rolling device according to claim 1, wherein at least one of the inner member, the outer member, and the rolling element is made of the titanium material according to claim 1.