JP2005324294A - Method and apparatus for polishing spherical portion of sliding member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for polishing a spherical portion of a sliding member which can improve the sphericity of the spherical portion of the sliding member composed of a stem member and a spherical portion fixed to one end of the stem member like a universal joint and a medical device. <P>SOLUTION: In the method for polishing the surface of the spherical portion 10b of the sliding member 10 while making the sliding member 10 composed of the stem member 10a and the spherical portion 10b fixed to one end of the stem member 10a rotate around the main rotational axis 1a of a rotational main spindle 1, a ring grinding wheel 3 having a diameter of not larger than 0.85 of the diameter of the spherical portion 10b is pressed against the surface of the spherical portion 10b via a grinding wheel spindle 2, and the grinding wheel spindle 2 is rotated around the center of the spherical portion 10b such that the rotational angle of at least 30° is concerned with the polishing at a B portion while making the wheel spindle 2 rotate around the rotational axis 2a passing the center in the radial direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention provides a spherical polishing of a sliding member for polishing the sphere of a sliding member composed of a stem member and a sphere fixed to one end of the stem member, such as a universal joint or a medical material (artificial hip joint). The present invention relates to a method and a spherical polishing apparatus thereof.

The following functions are required for the sphere of the sliding member including a stem member and a sphere fixed to one end of the stem member, such as a universal joint or a medical material.
(1) Surface roughness: The surface of the sphere needs to be mirror-finished in order to extend its life by improving wear resistance.
(2) Sphericity: High sphericity is required for suppressing uneven wear and smooth sliding.
As a device that polishes a spherical surface that is entirely spherical, such as a ball bearing, for example, a spherical polishing device that has a configuration described later is known.

First, a spherical polishing apparatus according to a first conventional example will be described with reference to FIG. 4 which is a sectional view showing the internal structure. That is, a central gear 22 is provided so as to be rotatable relative to the lower surface plate 11. The upper surface plate 18 is connected to an elevating means, and is configured to form a predetermined clearance 28 between the upper surface plate 18 and the lower surface plate 11 so as to be positioned at an operation position and a retracted position. The spherical body polishing apparatus 10 that meshes with the gear 20 and the central gear 22 is configured.
According to the sphere polishing apparatus 10 as described above, the sphere is received in the sphere receiving hole 41 formed in the planetary gear 40, and the planetary gear 40 revolves around the center gear 22 while rotating, and the sphere is fixed to the upper portion. Since the surface is uniformly polished by being sandwiched between the polishing cloth 18a of the platen 18 and the polishing cloth 11a of the lower surface plate 11, a highly accurate sphere having a diameter corresponding to the clearance formed between the two polishing cloths is obtained. (For example, refer to Patent Document 1).

  Next, a spherical polishing apparatus according to a second conventional example will be described with reference to FIG. 5 which is a schematic perspective view thereof. The drum-type grindstone 60 has an abrasive fixed to the outer peripheral portion thereof and is rotated by a drive motor 62 connected to one end of the shaft. On the surface of the abrasive, a plurality of concave grooves 63 such as V-grooves and semicircular arc grooves extending in the circumferential direction are formed side by side in the drum circumferential direction. A halved cylindrical disc 61 is concentrically disposed on the outer periphery of the drum-shaped grindstone 60 so as to surround the drum-shaped grindstone 60 and with a predetermined gap with respect to the outer peripheral surface of the drum-shaped grindstone 60. The halved cylindrical disk 61 is supported by a guide roller 65 having axes along the tangential direction of the outer periphery of the cylindrical disk at a plurality of positions on the outer peripheral part thereof, and the halved cylindrical disk 61 is driven by driving these guide rollers 65. 61 swings in the tangential direction of the drum-shaped grindstone 60.

  The upper and lower openings of the halved cylindrical disk 61 are different from the spherical discharge port 66 or supply port 67, and chutes 68 and 69 for introducing or introducing the sphere 46 are attached to these openings 66 and 67. In order to prevent the sphere 46 from scattering at the upper peripheral portion of the drum-shaped grindstone 60, a cover 70 that covers the upper peripheral portion of the drum-shaped grindstone 60 is provided at the upper opening of the half-shaped cylindrical disc 61. . A sphere 46 that has been subjected to a one-pass polishing action between the halved cylindrical disk 61 and the drum-shaped grindstone 60 and led out from the discharge port 66 via the discharge side chute 68 is a sphere circulation outside the machine that will be described later. The cycle of being introduced between the half-cut cylindrical disk 61 and the drum-shaped grindstone 60 through the supply side chute 69 and the supply port 67 again through the apparatus and receiving the polishing action of the next pass is repeated a plurality of times.

The spherical body circulation device is a cylindrical storage conveyor 71 that also serves to store and feed the spherical body 46. The spheres 46 taken out from the discharge side chute 68 are accommodated in a cylindrical accommodating portion 72 of the storage conveyor 71, and the spheres 46 are sequentially moved toward the outlet 73 of the cylindrical accommodating portion 72 by the action of the one-way rotating plate of the accommodating portion 72. The sphere 46 moves from the outlet 73 onto the supply chute 69. The halved cylindrical disk 61 is connected to a swing drive mechanism (not shown) and surrounds the drum-shaped grindstone 60, that is, the spherical moving path on the end week surface of the drum-shaped grindstone 60 is halved. The drum-shaped grindstone 60 is swung in the axial direction within a range that is not exposed axially outward from 61.
By such axial swinging of the half-shaped cylindrical disk 61 and rotation of the drum-shaped grindstone 60, the sphere 46 passing between the drum-shaped grindstone 60 and the half-shaped cylindrical disk 61 has an axial line in the tangential direction of the outer periphery of the grindstone. And rotating around the periphery of the drum-shaped grindstone 60 while being rolled in the circumferential direction. That is, it is cut while spinning, and the entire surface of the sphere 46 is ground in one pass, and the processing efficiency and the sphericity are improved (for example, see Patent Document 2).
JP 2001-38608 A JP 2001-62690 A

  However, in the case of the devices according to the above-described conventional examples 1 and 2, the surface of the sphere of the sliding member composed of a stem member and a sphere fixed to one end of the stem member is processed like a universal joint. I can't. Then, it processed with the spherical body polisher (conventional example 3) as shown in FIG. 6 of the typical structure explanatory drawing. This is because the grindstone shaft 12 is rotated around a rotation shaft 12a having a predetermined angle with respect to the main rotation shaft 11a of the rotation main shaft 11 and the sliding member 10 composed of the stem member 10a and the sphere 10b is attached to the grindstone shaft 12. The ring wheel 13 is pressed against the surface of the sphere 11b via the grindstone shaft 12, and a grindstone shaft rocking mechanism (not shown) that rocks the grindstone shaft 12 is formed. According to the sphere polishing apparatus having such a configuration, the surface roughness of the sphere 10b can be reduced by adjusting the particle size of the abrasive grains of the ring grindstone 13, and the surface of the sphere 10b can be made into a required mirror surface. Can be processed.

  Until now, the diameter of the ring grindstone 13 is made as large as possible with respect to the diameter of the sphere 10b, and the rocking range of the grindstone shaft 12 supporting the ring grindstone 13 is made small so that the surface processing state of the sphere 10b is stable. However, it has been considered that the sphericity is improved. However, as for the sphericity of the sphere 10b, as shown in FIG. 7 of the sphericity explanatory diagram of the sphere, the vertex of the sphere 10b has a concave shape, and the sphere 10b having the required sphericity is obtained. Is difficult. As shown in FIG. 8 of the explanatory diagram of the difference in the grinding direction depending on the processing part, this is due to the difference in the processing amount due to the difference in the grinding direction between the processing part of the ring grindstone 13, that is, the A part and B part of the ring grindstone 13. It is thought to be caused. The A part of the ring grindstone 13 means “near both ends in the direction orthogonal to the rocking direction of the ring grindstone”, and the B part of the ring grindstone 13 means “both ends of the ring grindstone in the rocking direction”. It is "near".

  Accordingly, an object of the present invention is to improve the sphericity of the sphere of a sliding member comprising a stem member and a sphere fixed to one end of the stem member, such as a universal joint or a medical material. It is to provide a spherical member polishing method for a sliding member and a spherical member polishing apparatus thereof.

  The present invention has been made in view of the above circumstances. Therefore, in order to solve the above-mentioned problems, the means employed by the sliding member spherical polishing method according to claim 1 of the present invention includes a stem member and the stem. While the sliding member composed of a sphere fixed to one end of the member is rotated by the rotation main shaft around the main rotation axis of the rotation main shaft that coincides with the longitudinal center of the sliding member, the sphere of the sliding member In the sphere polishing method of the sliding member for polishing the surface of the ring, a ring grindstone having a diameter of 0.85 or less of the diameter of the sphere is pressed to the surface of the sphere through a grindstone shaft, and the grindstone shaft is While rotating around the rotation axis passing through the center of the ring, it is swung so that 30 degrees or more about the center of the sphere is processed in the vicinity of both ends in the rocking direction of the ring grindstone. Is a thing

  The means adopted by the spherical member polishing apparatus for a sliding member according to claim 2 of the present invention is that a sliding member comprising a stem member and a spherical body fixed to one end of the stem member is arranged in the longitudinal direction of the sliding member. In a sphere polishing apparatus for a sliding member, comprising a rotating main shaft that rotates about a main rotating shaft that coincides with the center of the rotating member, and that polishes the surface of the sphere of the sliding member rotated by the rotating main shaft, the main rotation of the rotating main shaft The ball is pressed on the sphere through a first grindstone shaft that is provided on the same plane as the shaft and is rotated around a rotation axis of 135 degrees with the main rotation shaft, and the diameter of the sphere is 0.85 or less. A second grindstone shaft that is rotated about a rotation axis having an angle of 90 degrees with a first ring grindstone having a diameter and a rotation axis of the first grindstone shaft is 135 degrees. Pressed against the sphere through the sphere The second ring grindstone having a diameter of 0.85 or less, and the first grindstone axis and the second grindstone axis are at least 15 degrees centered on the center of the sphere, and both ends in the swinging direction of the ring grindstone It is characterized by comprising a grindstone shaft rocking mechanism that rocks so as to be processed in the vicinity of the part.

  Conventionally, the surface of the sphere has been processed by increasing the diameter of the ring grindstone as much as possible relative to the diameter of the sphere of the sliding member and reducing the swing range. In the sphere polishing method for a moving member and the sphere polishing apparatus for a sliding member according to claim 2, on the contrary, a ring grindstone having a diameter of 0.85 or less of the diameter of the sphere is pressed against the surface of the sphere. The grindstone is swung larger than before. Therefore, according to the sphere polishing method for a sliding member according to claim 1 of the present invention and the sphere polishing apparatus for a sliding member according to claim 2, a wide range of the surface of the sphere can be obtained in the rocking direction of the ring grindstone. Since the processing is performed near both ends, the sphericity of the sphere is improved.

  Hereinafter, a spherical member polishing apparatus for a sliding member according to Embodiment 1 of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic configuration explanatory view of a spherical member polishing apparatus for a sliding member according to Embodiment 1 of the present invention.

  The spherical body polishing apparatus includes a rotating main shaft 1 that rotates a sliding member 10 including a stem member 10 a and a spherical body 10 b around a main rotating shaft 1 a that coincides with the longitudinal center of the sliding member 10. Then, the grindstone shaft 2 rotated around the rotation shaft 2a having a predetermined angle (for example, 135 °) with respect to the main rotation shaft 1a of the rotation main shaft 1 and the grindstone shaft 2 are attached to the grindstone shaft 2. The ring grindstone 3 is pressed against the surface of the sphere 1b via the wheel 1 and the grindstone shaft rocking mechanism (not shown) that rocks the grindstone shaft 2 is formed. As is well understood from the above description, the configuration of this sphere polishing apparatus includes the main configuration of the sphere polishing apparatus according to Conventional Example 3 that processes the surface of the sphere bonded to the stem member, such as a universal joint. Although it is the same structure, it differs in the following points.

  That is, the diameter of the ring grindstone 3 is set to 0.85 or less of the diameter of the sphere 1b. And the grindstone shaft 2 that supports the ring grindstone 3 is processed at a portion B that is near both ends in the swinging direction of the ring grindstone 3 at 30 degrees or more around the center of the spherical body 10b. It is set to be swung by a grindstone rocking mechanism (not shown).

According to the sphere polishing apparatus for the sliding member 1 according to the first embodiment of the present invention, the ring grindstone 3 having a diameter of 0.85 or less of the diameter of the sphere 10b of the sliding member 10 is pressed against the surface of the sphere 10b. The grindstone 3 is swung 30 degrees. Accordingly, since a wide range of the surface of the sphere 10b is processed in the vicinity of both ends in the swinging direction of the ring grindstone 3, the sphericity of the sphere 10b is improved.
That is, by increasing the rocking angle of the grindstone shaft 2 (increasing the grinding speed) and machining the entire sphere 10b as close as possible to both ends in the rocking direction of the ring grindstone 3, the roundness of the sphere 10b ( (Sphericity) is improved.

Next, a spherical member polishing apparatus for a sliding member according to Embodiment 2 of the present invention will be described with reference to the accompanying drawings. FIG. 2 is a schematic configuration explanatory view of a spherical member polishing apparatus for a sliding member according to Embodiment 2 of the present invention.
The same parts as those in the first embodiment will be described with the same reference numerals.

  That is, in the case of the spherical polishing apparatus according to the first aspect, it is necessary to increase the required rocking range of the ring grindstone as the diameter of the ring grindstone is reduced. Since the swing range of such a sphere polishing apparatus is limited, the required swing range may not be realized. Therefore, in the spherical body polishing apparatus according to the second embodiment, two grindstone shafts for supporting the ring grindstone are provided and are of a two-shaft type.

  Specifically, the sliding member 10 including the stem member 10a and the sphere 10b fixed to one end of the stem member 10a is rotated around the main rotation shaft 1a that coincides with the longitudinal center of the sliding member 10. A rotation main shaft 1 is provided. The sliding main shaft 1 is provided on the same plane as the main rotating shaft 1a, and is slid through a first grindstone shaft 2 that is rotated around a rotating shaft 2a having an angle of 135 degrees with the main rotating shaft 1a. The first ring grindstone 3 is pressed against the surface of the sphere 10b of the member 10 and has a diameter of 0.85 or less of the diameter of the sphere 10b. Further, through the second grindstone shaft 4 rotated about the rotation shaft 4a whose angle with the main rotation shaft 1a is 90 degrees and the angle with the rotation shaft 2a of the first grindstone shaft 2 is 135 degrees. The second ring grindstone 5 is pressed against the surface of the sphere 1b and has a diameter of 0.85 or less of the diameter of the sphere 1b. Further, the first grindstone shaft 2 and the second grindstone shaft 4 are each 15 degrees or more around the center of the sphere 1b, near both ends in the swinging direction of the first and second ring grindstones 3 and 5. A grindstone shaft rocking mechanism (not shown) that rocks so as to be processed as described above is provided.

  According to the spherical member polishing apparatus for a sliding member according to the second embodiment of the present invention, since the grindstone shaft is biaxial, the first and second ring grindstones 3 and 5 are each swung by 15 degrees to form the first embodiment. Thus, the sphere 1b having the same sphericity as when processed by the sphere polishing apparatus according to the present invention can be obtained.

  Table 1 below shows an experimental example in which the roundness of a sphere is obtained when the diameter of the ring grindstone is changed and the swing angle is changed using the sphere polishing apparatus according to the first aspect. The ring grindstone used in this experiment is a metal bond diamond grindstone, and the grain size of the abrasive grains is # 400.

上記表１に示す結果を、揺動角度が１５°の場合を黒丸印で、揺動角度が３０°の場合を一重丸印で、揺動角度が４０°の場合を二重丸印でそれぞれ示すと、縦軸に球体の真円度（μｍ）をとり、横軸に砥石の径／球体の径をとって示す「球体と砥石の径比と、真円度との関係説明図」の図３に示すとおりである。この図３によれば、砥石軸を、球体の中心を中心として３０度以上揺動させた場合、リング砥石の直径を球体の直径の０．９以下にすれば、真円度が優れた球体を得るのに一応の効果が得られることが分かる。なお、好ましくは０．８５以下であり、より好ましくは０，８以下である。

The results shown in Table 1 above are indicated by a black circle when the swing angle is 15 °, a single circle when the swing angle is 30 °, and a double circle when the swing angle is 40 °. In the figure, the vertical axis represents the roundness (μm) of the sphere, and the horizontal axis represents the diameter of the grindstone / the diameter of the sphere. As shown in FIG. According to FIG. 3, when the grindstone shaft is swung by 30 degrees or more around the center of the sphere, if the diameter of the ring grindstone is made 0.9 or less of the diameter of the sphere, the sphere having excellent roundness It can be seen that a temporary effect can be obtained. In addition, Preferably it is 0.85 or less, More preferably, it is 0.8 or less.

  In the above, the experimental example using the sphere polishing apparatus according to aspect 1 has been described. However, if the sphere polishing apparatus according to aspect 2 is used, the first and second grindstone axes 2 and 4 are each 15 By swinging by more than 0 °, it is possible to obtain a sphere having roundness equivalent to that in the above embodiment.

It is typical structure explanatory drawing of the spherical body polishing apparatus of the sliding member which concerns on Embodiment 1 of this invention. It is typical structure explanatory drawing of the spherical body polishing apparatus of the sliding member which concerns on Embodiment 2 of this invention. It is a relationship explanatory drawing of the diameter ratio of a spherical body and a grindstone, and the roundness regarding the Example by the spherical body polisher of the sliding member which concerns on the form 1 of this invention. It is sectional drawing which shows the internal structure of the spherical body polisher which concerns on a 1st prior art example. It is a schematic perspective view of the spherical body polisher concerning the 2nd conventional example. It is typical structure explanatory drawing of the sphere grinding | polishing apparatus which concerns on the prior art example 3. It is explanatory drawing of the sphericity of a sphere. It is explanatory drawing of the difference in the grinding direction by a process part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Rotating main shaft, 1a ... Main rotating shaft 2 ... Grinding wheel axis | shaft or 1st whetstone axis | shaft, 2a ... Rotating shaft 3 ... Ring whetstone or 1st ring whetstone 4 ... 2nd whetstone axis | shaft, 4a ... Rotating shaft 5 ... 2nd ring whetstone DESCRIPTION OF SYMBOLS 10 ... Sliding member, 10a ... Stem member, 10b ... Sphere

Claims (2)

  While rotating a sliding member composed of a stem member and a sphere fixed to one end of this stem member around the main rotation axis of the rotation main shaft, which coincides with the center of the sliding member in the longitudinal direction, In the sphere polishing method of a sliding member for polishing the surface of the sphere of the sliding member, a ring grindstone having a diameter of 0.85 or less of the diameter of the sphere is pressed against the surface of the sphere through a grindstone shaft. While rotating the grindstone shaft about the rotation axis passing through the center in the radial direction, the rocking wheel is swung so that the machining at the both ends in the rocking direction of the ring grindstone is 30 degrees or more around the center of the sphere. A method for polishing a sphere of a sliding member, comprising: A rotating main shaft is provided for rotating a sliding member composed of a stem member and a spherical body fixed to one end of the stem member about a main rotating shaft that coincides with the longitudinal center of the sliding member. In a sphere polishing apparatus for a sliding member for polishing a surface of a sphere of the sliding member to be rotated, the sliding member sphere polishing apparatus is provided on the same plane as the main rotation axis of the rotation main shaft, and an angle formed with the main rotation shaft is 135 degrees. The angle formed between the first main ring wheel, which is pressed against the sphere through the first grindstone shaft rotated around the rotation axis and has a diameter of 0.85 or less of the diameter of the sphere, and the rotation main shaft is 90 degrees. And the angle formed with the rotation axis of the first grindstone shaft is pressed against the sphere through the second grindstone shaft rotated around the rotation axis of 135 degrees, and has a diameter of 0.85 or less of the diameter of the sphere. Second ring grindstone and the first grindstone And a grindstone shaft rocking mechanism that rocks the shaft and the second grindstone shaft so that machining is performed near both ends in the rocking direction of the ring grindstone by 15 degrees or more around the center of the sphere. A spherical member polishing apparatus for a sliding member.

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