JP2005103652A - Method for manufacturing glass ring and device therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture a glass ring by using one machine, and also to provide a method and a device for manufacturing the glass ring with high dimensional accuracy. <P>SOLUTION: The device 20 for manufacturing the glass ring is composed of: a rotating device 26 comprising a chuck 22 and a motor 24; an outer diameter form grinding wheel device 32 comprising an outer diameter form grinding wheel 28 and a motor 30; an inner diameter form grinding wheel device 38 comprising an inner diameter form grinding wheel 34 and a motor 36; a moving device 42 of an inner peripheral chuck bar 40; and a cutter 46 or the like comprising a multi-wheel 44 and the motor 30. The manufacturing device 20 is operated by the manufacturing method in which at first inner/outer diameter finishing and chamfering are executed in a state of tubular glass 52 and cutting is executed after that in consideration of the necessity of the inner/outer finishing and the chamfering in the post-machining. By this, all machining by holding a product one time is realized. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method and apparatus for manufacturing a glass ring, and more particularly to a method and apparatus for manufacturing a glass spacer ring used for a magnetic disk device.

  A magnetic disk apparatus 1 shown in FIG. 10 has a plurality of (three in FIG. 10) magnetic disks 3, 3,... Laminated. Then, a shim 5 is placed on the upper surface of the magnetic disk 3 stacked on the top, and the clamp 6 is fastened to the shaft body 2 by a screw 7 from above the shim 5, whereby the magnetic disks 3, 3,. It is clamped by the flange 2 </ b> A and the clamp 6 and fixed to the shaft body 2. A spindle 8 of a motor (not shown) is connected to the shaft body 2. When the magnetic disks 3, 3... Are rotated at high speed by the driving force of the motor, the magnetic heads 9, 9... Move while floating on the surfaces of the magnetic disks 3, 3, and read the information recorded on the magnetic disk 3. And writing is done.

  The magnetic disk 3 is configured by forming a magnetic film on the surface of a substrate. Aluminum and glass are known as the material of the substrate, and aluminum, stainless steel, glass, and ceramics are known as the material of the spacer ring 4.

  In recent magnetic disk devices 1, it is important to reduce the distance between the magnetic disk 3 and the magnetic head 9 as much as possible with high-density recording and large capacity of information. High precision is required for surface smoothness. Therefore, a glass that is harder and has better flatness than an aluminum substrate is excellent as a substrate for the magnetic disk 3 because it can effectively obtain a smooth surface and can be adapted to light weight and downsizing. . Further, when the substrate of the magnetic disk 3 is made of glass, it is preferable to use a glass spacer ring 4 in order to prevent a disk slip phenomenon caused by a difference in thermal expansion (for example, patent document). 1).

  The glass spacer ring manufacturing method previously filed by the applicant of the present application (Japanese Patent Application No. 2002-74770) first produces tube glass as a material for the spacer ring using a glass tube forming machine. As the glass tube forming machine, those using the Danner method, the updraw method, etc. are known, but in these glass tube forming machines, the outer diameter and inner diameter of the tube glass are of the order required for the spacer ring. It is difficult to mold to dimensions.

Under such circumstances, the above-described manufacturing method first cuts the glass tube manufactured by the glass tube forming machine into the thickness of the spacer ring with a cutter such as a wheel saw. Next, the inner peripheral surface of the glass ring cut into a ring is dimensioned by an inner diameter grinding device and the inner peripheral edge portion is chamfered. Next, the outer peripheral surface of the glass ring is dimensioned by an outer diameter grinding device and the outer peripheral edge portion is chamfered. By this manufacturing method, a spacer ring having a desired dimension is manufactured from the tube glass.
Japanese Patent Laid-Open No. 10-74350 (FIG. 1 on page 5)

  However, since the manufacturing method of the spacer ring requires three processing machines, a wheel saw, an inner diameter grinding device, and an outer diameter grinding device, it is difficult to align the product by each product, and roundness, concentricity, etc. In addition, it is difficult to obtain accuracy, and there are many problems such as occurrence of defects due to frequent product gripping.

  The present invention has been made in view of such circumstances, and provides a manufacturing method and apparatus for a glass ring with high dimensional accuracy while enabling the manufacturing of a glass ring with a single processing machine. With the goal.

  In order to achieve the above object, the glass ring manufacturing method of the present invention causes the rotating glass to hold the tube glass manufactured to have a predetermined outer diameter and inner diameter, and the rotating means centers the tube glass around its central axis. The outer peripheral surface of the tube glass is ground by the outer diameter total shape grindstone means, and the outer peripheral surface has a protruding portion corresponding to the outer diameter and thickness of the ring, a tapered portion corresponding to the outer peripheral chamfered portion of the ring, and A groove for cutting the ring from the tube glass is ground, and the inner peripheral surface of the tube glass is ground by means of an inner diameter total grinding wheel, and the inner surface of the tube corresponds to the inner diameter and thickness of the ring. , Grinding the taper part corresponding to the chamfered part of the ring and the concave part for cutting the ring from the tube glass, and fitting the inner chuck member to the inner peripheral surface of the ground tube glass And fitted to the inner circumferential chuck member The glass tube is obtained from the tube glass by cutting the tube glass with the cutting means by combining the concave portion of the outer peripheral surface of the tube glass and the concave portion of the inner peripheral surface of the tube glass. Yes.

  In order to achieve the above object, the glass ring manufacturing apparatus of the present invention holds a tube glass manufactured to a predetermined outer diameter and inner diameter, and rotates the tube glass about its central axis. And an outer peripheral surface of the tube glass held by the rotating means, and a convex strip corresponding to the outer diameter and thickness of the ring on the outer peripheral surface, a tapered portion corresponding to the outer peripheral chamfered portion of the ring, and the tube glass Grinding the inner peripheral surface of the tube glass held by the rotating means, and grinding the inner surface of the ring to the inner diameter and thickness of the ring. An inner diameter total shape grindstone means for grinding a corresponding convex portion, a taper portion corresponding to an inner peripheral chamfered portion of the ring, and a concave portion for cutting the ring from the tube glass, and the outer diameter total shape grindstone means, Before being ground by the inner diameter total shape grinding wheel means An inner peripheral chuck member fitted to the inner peripheral surface of the tube glass, and a cutting means for cutting the tube glass fitted to the inner peripheral chuck member, wherein the concave strip portion and the tube on the outer peripheral surface of the tube glass A cutting means for cutting the tube glass together with the concave portion on the inner peripheral surface of the glass to obtain a glass ring is provided.

  According to the present invention, the tube glass manufactured by the glass tube forming machine is first held by the rotating means.

  Next, the outer peripheral surface of the tube glass is ground by the outer diameter overall grinding wheel means while rotating the tube glass around its central axis by the rotating means, and the outer diameter and thickness of the ring are equivalent to the outer peripheral surface of the tube glass. Grinding the ridges, the taper corresponding to the chamfered portion of the ring, and the ridges for cutting the ring from the tube glass, and the inner peripheral surface of the tube glass is ground by means of the inner diameter grinding wheel means. Then, a convex strip corresponding to the inner diameter and thickness of the ring, a taper corresponding to the inner peripheral chamfer of the ring, and a concave portion for cutting the ring from the tube glass are ground on the inner peripheral surface of the tube glass.

  Such grinding by the outer diameter total shape grindstone means and grinding by the inner diameter total shape grindstone means may be performed simultaneously or sequentially. When carried out simultaneously, the inner diameter total shape grindstone means functions as a support for supporting the tube glass during processing by the outer diameter total shape grindstone means, and similarly, the outer diameter total shape grindstone means is the tube glass during processing by the inner diameter total shape grindstone means. Because it functions as a support that supports the tube glass, the tube glass can be processed without shaking. Therefore, processing accuracy is increased.

  Next, an inner peripheral chuck member is fitted to the inner peripheral surface of the ground tube glass while the tube glass is held by the rotating means.

  Then, while rotating the tube glass fitted to the inner peripheral chuck member by the rotating means, the concave portion of the outer peripheral surface of the tube glass and the concave portion of the inner peripheral surface of the tube glass are combined and cut by the cutting means, Get a glass ring from glass. At the time of cutting by the cutting means, the tube glass is zero ground by the inner peripheral chuck member, and the cut glass ring is also held by the inner peripheral chuck member to prevent the tube glass from jumping out. A glass ring without a defective part can be manufactured.

  Thus, in the present invention, in consideration of the necessity of inner and outer diameter finishing and chamfering in post-processing, a manufacturing method was adopted in which inner and outer diameter finishing and chamfering were first performed in the state of the tube glass and then cut. Therefore, all processing by holding the product once is possible. Therefore, according to the present invention, it is possible to manufacture a glass ring with a single processing machine, thereby improving the manufacturing tact and manufacturing a glass ring with high dimensional accuracy.

  In the present invention, the outer diameter total shape grindstone means and the inner diameter total shape grindstone means include a rough grinding grindstone and / or a finish grinding grindstone. In the case where both of the grindstones are provided, after the rough grinding with the rough grinding grindstone, the finish grinding with the finish grinding grindstone is performed. Thereby, processing accuracy is also improved.

  As described above, according to the method and apparatus for manufacturing a glass ring according to the present invention, considering the necessity of inner and outer diameter finishing and chamfering in post-processing, first, inner and outer diameter finishing and A manufacturing method that uses chamfering and then cuts is adopted, making it possible to carry out all processing by holding the product once. This makes it possible to manufacture a glass ring with a single processing machine, improving manufacturing tact. In addition, a glass ring with high dimensional accuracy can be manufactured.

  The outer diameter total shape grindstone means and the inner diameter total shape grindstone means of the present invention include a rough grinding wheel and a finish grinding wheel, and after the rough grinding with the rough grinding wheel, the finish grinding with the finish grinding wheel. Therefore, machining accuracy is improved.

  Next, a preferred embodiment of a glass ring manufacturing method and apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a perspective view showing, in section, a part of a glass ring 10 that is a material of a spacer ring according to the present invention. The glass ring 10 is manufactured by grinding the inner and outer diameters of the glass tube 52 and by cutting the tube glass 52 by the manufacturing apparatus 20 shown in FIGS. 2 to 4, and as shown in FIG. The contact surface 11, the inner peripheral surface 12, and the outer peripheral surface 13 are substantially rectangular. In addition, as shown in the enlarged sectional view of the ring portion in FIG. 1, the inner peripheral edge C and the outer peripheral edge C of the ring portion are chamfered, and the chamfering is performed by the manufacturing apparatus 20.

  Since the glass ring 10 shown in FIG. 1 is a member in the previous stage of forming an etching process or a conductive film, the shape of the glass ring 10 is the shape of the spacer ring used in the magnetic disk device. Is exactly the same as the spacer ring. That is, in FIG. 1, D is the outer diameter of the spacer ring, d is the inner diameter of the spacer ring, a is the width of the contact surface of the spacer ring, and b is the thickness of the spacer ring. Approximate to dimensions.

  A glass ring manufacturing apparatus 20 shown in FIGS. 2 to 4 includes a rotating device (corresponding to a rotating means) 26 including a chuck 22 and a motor 24, an outer diameter total shape grindstone 28, and a motor 30. Device (corresponding to outer diameter total grinding wheel means) 32, inner diameter total grinding wheel device (corresponding to inner diameter total grinding wheel means) 38 comprising inner diameter total grinding wheel 34 and motor 36, inner peripheral chuck bar (corresponding to inner peripheral chuck member) ) 40 moving device 42, and a cutter (corresponding to a cutting means) 46 including a multi-wheel 44 and a motor 30.

  The rotating device 26 is provided on a mounting plate 50 erected on a base 48. The chuck 22 of the rotating device 26 is rotatably provided on the front side of the mounting plate 50 via a bearing (not shown), and the main body of the motor 24 is fixed to the back side of the mounting plate 50, so The illustrated spindle is connected to the chuck 22. Accordingly, the chuck 22 is rotated at a predetermined rotational speed by the driving force of the motor 24 being transmitted.

  The chuck 22 is provided with a plurality of claws (not shown) that hold the tube glass 52. The tube glass 52 is manufactured by a glass tube forming machine, cut into a predetermined length, and then set on the chuck 22. The plurality of claws of the chuck 22 are configured to move forward and backward in conjunction with the rotation center axis of the chuck 22. Therefore, the tube glass 52 is held by the chuck 22 at a position where the center axis P of the tube glass 52 matches the rotation center axis of the chuck 22, and is rotated around the center axis P by the rotation of the chuck 22.

  The outer diameter overall grindstone device 32 is arranged to face the rotating device 26, and is configured by connecting the central axis of the outer diameter overall shape grindstone 28 to the spindle 31 of the motor 30. Further, the spindle 31 of the motor 30 is disposed in parallel with the rotation center axis of the chuck 22. With this configuration, the central axis of the outer diameter total grinding wheel 28 connected to the spindle 31 and the central axis P of the tube glass 52 held by the chuck 22 are set in parallel.

  The outer diameter total shape grindstone 28 is formed in a columnar shape, and a small diameter rough grinding grindstone 54 and a large diameter finish grinding grindstone 56 are integrally formed in the axial direction. The rough grinding wheel 54 is a grindstone having a smaller number than the finish grinding wheel 56, and grinds the tube glass 52 at a higher grinding speed (grinding wheel feed speed) than the finish grinding wheel 56.

  Further, as shown in FIG. 5, the rough grinding grindstone 54 has convex ridges 58 and concave ridges 60 alternately formed, and tapered portions 62 and 62 are formed on both side surfaces of the convex ridges 58. The ridge 58 grinds the outer peripheral surface of the tube glass 52 held by the chuck 22 (see FIG. 2), and cuts the glass ring 10 (see FIG. 1) from the tube glass 52 to the outer peripheral surface of the tube glass 52. It is a grindstone part which grinds the groove part 70 (refer FIG. 6) for forming the groove cutting line to perform. Further, the concave strip portion 60 grinds the outer peripheral surface of the tube glass 52 held by the chuck 22 (see FIG. 2), and the outer diameter of the glass ring 10 (see FIG. 1) It is a grindstone portion for grinding a portion corresponding to the thickness. Further, the tapered portion 62 is a grindstone portion for forming a chamfer on the outer peripheral edge portion of the glass ring 10.

  The rough grinding grindstone 54 formed in this way has a plurality of locations (six ridge portions in the drawing) such that the ridge portions 58 and the recess ridge portions 60 are alternately arranged and the ridge portions 58 are located on both sides. 58 and five recessed strip portions 60) are formed, and in the illustrated example, five glass rings 10 can be ground simultaneously from one tube glass 52. Note that the number of simultaneous processing of the glass ring 10 is not limited to five, and may be one or more.

  Similarly, the grinding wheel 56 for finishing grinding of the outer diameter total shape grinding wheel 28 is also provided at a plurality of locations (six locations in the drawing) such that the convex strips 64 and the concave strips 66 are alternately arranged and the convex strips 64 are located on both sides. Ridges 64 and five concave ridges 66) and tapered portions 68, 68 are formed on both side surfaces of the ridges 64. As shown in FIGS. 5 and 6, the protruding portion 64 further grinds the recessed portion 70 ground by the protruding portion 58 of the rough grinding wheel 54, and the glass tube 52 is formed on the outer peripheral surface of the tube glass 52. This is a grindstone for grinding a concave cutting line 72 (see FIG. 7) for cutting the ring 10 (see FIG. 1). In addition, as shown in FIGS. 5 and 6, the groove portion 66 further grinds the protrusion portion 74 ground by the groove portion 60 of the rough grinding stone 54, and a glass ring is formed on the outer peripheral surface of the tube glass 52. 10 (see FIG. 1) is a grindstone portion for grinding a protruding portion 76 (see FIG. 7) corresponding to an outer diameter D and a thickness b of 10 (see FIG. 1). Further, the tapered portion 68 further chamfers the outer peripheral edge portion 78 of the glass ring 10 ground by the tapered portion 62 of the rough grinding wheel 54 as shown in FIGS. It is a grindstone part that forms a chamfer 80 (see FIG. 7).

  The finish grinding grindstone 56 formed in this way has six convex strips 64 and five concave strips 66 alternately formed as shown in the figure, so that one tube glass 52 to five is provided. The individual glass rings 10 can be ground simultaneously.

  In the embodiment, the outer diameter total shape grindstone 28 in which the rough grinding grindstone 54 and the finish grinding grindstone 56 are integrally formed has been described. However, both the grindstones 54 and 56 are not necessarily provided. What is necessary is just to have one grindstone.

  As shown in FIG. 2, the motor 30 of the outer diameter overall grinding wheel device 32 is slidably supported on the guide rail 84 via the slider 82 and is moved along the guide rail 84 by a feed device (not shown) that moves the slider 82. Is reciprocated. The guide rail 84 is disposed in the X direction orthogonal to the rotation center axis of the chuck 22. Therefore, when the motor 30 is moved along the guide rail 84 in the X direction, the outer diameter overall grinding wheel 28 is moved in the X direction, that is, in a direction orthogonal to the central axis P of the tube glass 52 held by the chuck 22. Since it is moved, the tube glass 52 is ground in the orthogonal direction.

  On the other hand, the inner diameter total grinding wheel device 38 is arranged in parallel with the outer diameter total shape grinding wheel device 32 and is disposed to face the rotating device 26, and the central axis of the inner diameter total shape grinding wheel 34 is arranged on the spindle 37 of the motor 36. It is connected. The spindle 37 is installed in parallel with the rotation center axis of the chuck 22. As a result, the central axis of the inner diameter grinding wheel 34 connected to the spindle 37 and the central axis P of the tube glass 52 held by the chuck 22 are set in parallel.

  The total inner diameter grindstone 34 of the total inner diameter grindstone device 38 is formed in a stick shape, and a small diameter rough grinding grindstone 86 and a large diameter finish grinding grindstone 88 are integrally formed in the axial direction. . The rough grinding wheel 86 is a grindstone having a smaller number than the finish grinding wheel 88, and grinds the tube glass 52 by setting the grinding speed (grind feed speed) higher than the finish grinding wheel 88.

  As shown in FIG. 5, the rough grinding grindstone 86 has convex ridges 90 and concave ridges 92 alternately formed, and tapered portions 94, 94 are formed on both side surfaces of the convex ridge 90. The ridge 90 grinds the inner peripheral surface of the tube glass 52 held by the chuck 22 (see FIG. 2), and the glass ring 10 (see FIG. 1) is formed on the inner peripheral surface of the tube glass 52 from the tube glass 52. It is a grindstone part which grinds the groove part 96 (refer FIG. 6) for forming the groove cutting line which cut | disconnects. Further, the concave stripe portion 92 grinds the inner peripheral surface of the tube glass 52 held by the chuck 22 (see FIG. 2), and the inner diameter of the glass ring 10 (see FIG. 1) is formed on the inner peripheral surface of the tube glass 52. And a grindstone for grinding a portion corresponding to the thickness. Further, the tapered portion 94 is a grindstone portion for forming a chamfer on the inner peripheral edge portion of the glass ring 10.

  The rough grinding wheel 86 formed in this manner has six protruding ridges 90 and five concave ridges 92 alternately formed as shown in the figure, so that one tube glass 52 to 5 is formed. The individual glass rings 10 can be ground simultaneously.

  Similarly, the grinding wheel 88 for finishing grinding of the inner diameter general grinding wheel 34 is also formed with six protruding ridges 98 and five concave ridges 100 alternately as shown in the figure and on both side surfaces of the protruding ridge 98. Tapered portions 102, 102 are formed. As shown in FIGS. 5 and 6, the ridge 98 further grinds the concave ridge 96, which is ground by the ridge 90 of the rough grinding stone 86, and the tube glass 52 has an inner peripheral surface from the tube glass 52. It is a grindstone portion for grinding a concave cutting line 104 (see FIG. 7) for cutting the glass ring 10 (see FIG. 1). 5 and 6, the groove portion 100 is further ground on the protrusion portion 106 ground by the groove portion 92 of the rough grinding grindstone 86, and the glass ring 10 ( This is a grindstone portion for grinding the ridge 108 (see FIG. 7) corresponding to the inner diameter d and thickness b of FIG. Further, the tapered portion 102 further chamfers the outer peripheral edge portion 110 of the glass ring 10 ground by the tapered portion 94 of the rough grinding wheel 86 as shown in FIGS. It is a grindstone part which forms the chamfer 112 (refer FIG. 7).

  The finish grinding wheel 88 formed in this way has six protruding ridges 98 and five concave ridges 100 alternately formed as shown in the figure, so that one tube glass 52 to 5 is formed. The individual glass rings 10 can be ground simultaneously.

  In the embodiment, the inner diameter overall grinding wheel 34 in which the rough grinding wheel 86 and the finish grinding wheel 88 are integrally formed has been described. However, it is not always necessary to have both the grinding wheels 86, 88. What is necessary is just to have a grindstone.

  As shown in FIG. 2, the motor 36 of the inner diameter total grinding wheel device 38 is slidably supported on the guide rail 84 via the slider 114, and along the guide rail 84 by a feed device (not shown) that moves the slider 114. It is reciprocated. Since the guide rail 84 is disposed in the X direction orthogonal to the rotation center axis of the chuck 22, when the motor 36 is moved in the X direction along the guide rail 84, the inner diameter overall grinding wheel 34 is moved in the X direction. That is, since the tube glass 52 is moved in a direction orthogonal to the central axis P of the tube glass 52 held by the chuck 22, the tube glass 52 is ground in the orthogonal direction.

  The guide rail 84 is mounted on a slider 116, and the slider 116 is slid by a feeding device (not shown) along a guide groove 118 formed on the base 48. Since the guide groove 118 is formed in the Y direction perpendicular to the X direction, the outer diameter overall grinding wheel device 32 and the inner diameter overall grinding wheel device 38 provided on the slider 116 via the guide rail 84 are in the Y direction, that is, The chuck 22 is moved along the rotation center axis (= the center axis P of the tube glass 52).

  On the other hand, the inner circumferential chuck bar 40 is located at a position retracted from the tube glass 52 as shown in FIG. 3 during grinding by the outer diameter total grinding wheel device 32 and the inner diameter total grinding wheel device 38. When the grinding process by 32 and 38 is completed, the inner periphery of the tube glass 52 of FIG. 7 is fitted as shown in FIGS.

  The moving device 42 shown in FIG. 2 that moves the inner circumferential chuck bar 40 from the retracted position to the fitting position has a rod 120 that can rotate and extend. The rod 120 is attached to the mounting plate 50 along the Y direction, is rotated by a motor (not shown), and is expanded and contracted by a pneumatic device (not shown).

  The base end portion of the arm 122 is connected to the tip end portion of the rod 120 along the X direction, and the inner circumferential chuck bar 40 is rotatably supported by the tip end portion of the arm 122. The rod 120 is extended from the contracted state of FIG. 2, and thereafter the rod 120 is rotated so that the central axis of the inner peripheral chuck bar 40 is aligned with the central axis P of the tube glass 52 and the rod 120 is contracted. The inner circumferential chuck bar 40 is fitted to the inner circumferential surface of the tube glass 52 as shown in FIGS.

  The multi-wheel 44 of the cutter 46 has a rotating shaft 124 connected to the central axis of the outer diameter overall grinding wheel 28. Therefore, the multi-wheel 44 is rotated by the driving force of the motor 30.

  Further, as shown in FIG. 8, the multi-wheel 44 rotates six outer peripheral blade blades 126, 126... (In FIG. 8, a part of the outer peripheral blade blade 126 is omitted) to correspond to the six concave cutting lines 72, 104. The interval s between the outer peripheral blades 126, 126... Is set to the thickness b of the glass ring 10, and the thickness t of the outer peripheral blade blade 126 is a concave line. The groove width u of the cutting lines 72 and 104 is set. Therefore, by aligning the outer peripheral blades 126, 126... Of the multi-wheel 44 with the concave cutting lines 72, 104 and cutting the concave cutting lines 72, 104 with the outer peripheral blades 126, 126. As described above, five glass rings 10, 10... Are cut out from the tube glass 52 in a single cutting step.

  Next, the operation of the manufacturing apparatus 20 configured as described above will be described.

  First, the tube glass 52 manufactured by the glass tube forming apparatus is held by the chuck 22.

  Next, while rotating the tube glass 52 around the central axis P by the rotating device 26, as shown in FIGS. 5 and 6, the rough grinding wheel 54 and the finish grinding of the outer diameter overall grinding wheel device 32 are used. The outer periphery of the tube glass 52 is ground by the grindstone 56, and the outer peripheral surface of the tube glass 52 is projected on the outer peripheral surface of the tube ring 52 as shown in FIG. The corresponding chamfer 80 and the concave cutting line 72 for cutting the glass ring 10 from the tube glass 52 are ground, and the inner circumference of the tube glass 52 is ground by the inner diameter total shape grindstone device 32. From the inner peripheral surface of the glass ring 10 ridges 108 corresponding to the inner diameter d and thickness b of the glass ring 10, the tapered portion 112 corresponding to the inner peripheral chamfered portion of the glass ring 10, and the tube glass 52 The concave cutting line 104 for cutting the scan metallic ring 10 for grinding.

  The grinding process by the outer diameter total shape grindstone device 32 and the grinding process by the inner diameter total shape grindstone device 38 may be performed simultaneously or sequentially. When implemented simultaneously, the grindstones 86 and 88 of the inner diameter total shape grindstone device 38 function as a support for supporting the tube glass 52 during processing by the grindstones 54 and 56 of the outer diameter total shape grindstone device 32. Since the grindstones 54 and 56 function as a support for supporting the tube glass 52 during processing by the grindstones 86 and 88 of the grindstone device 38, the tube glass 52 can be cut without the tube glass 52 being shaken. Therefore, processing accuracy is increased.

  Next, with the tube glass held by the rotating device 26, the inner peripheral chuck bar 40 is fitted to the inner peripheral surface of the ground tube glass 52 as shown in FIGS.

  Then, while rotating the tube glass 52 fitted to the inner peripheral chuck bar 40 with the rotation device 26, the concave cutting line 72 on the outer peripheral surface of the tube glass and the concave cutting line 104 on the inner peripheral surface of the tube glass are combined. Cut by the multi-wheel 44 of the cutter 46 to obtain five glass rings 10, 10... From the tube glass 52 as shown in FIG.

  At the time of cutting by the cutter 46 at this time, the tube glass 52 is zero ground by the inner circumferential chuck bar 40, and the cut glass ring 10 is also held by the inner circumferential chuck bar 40 to prevent the tube glass 52 from popping out. Therefore, it is cut without generating defective parts such as chipping.

  As described above, the ring manufacturing apparatus 10 according to the embodiment considers the necessity of inner / outer diameter finishing and chamfering in the post-processing, and first finishes the inner / outer diameter finishing and chamfering in the state of the tube glass 52 (FIG. 5, FIG. 5). 6) and then a cutting method (see FIGS. 8 and 9) was adopted, so that the entire processing by holding the product once was made possible. Therefore, according to the manufacturing method of this invention, manufacture of the glass ring 10 by the one manufacturing apparatus 20 is attained, A manufacturing ring can be improved and a glass ring with high dimensional accuracy can be manufactured.

  The outer diameter total grinding wheel device 32 and the inner diameter total grinding wheel device 38 of the manufacturing apparatus 20 include rough grinding wheels 54 and 86 and finish grinding wheels 56 and 88. After the grinding process, finish grinding is performed using the grinding wheels 56 and 88 for finish grinding. Thereby, processing accuracy is also improved.

  The tube glass having an outer diameter of 24.1 mm ± 0.5 mm and an inner diameter of 20.0.025 mm ± 0.015 is formed by a Danner-type tube tube forming machine for a neck tube for a cathode-ray tube, and the manufacturing apparatus shown in FIG. When the glass ring 10 is manufactured according to No. 20, the glass ring 10 having an outer diameter of 23.630 mm ± 0.025 mm and an inner diameter of 1.9995 mm ± 0.010, which are dimensions for obtaining the product specification dimensions of the spacer ring, is obtained. I was able to.

The perspective view including the partial cross section which showed the glass ring which is an intermediate member of a glass spacer ring The perspective view which shows the structure of the manufacturing apparatus of the glass ring of embodiment The perspective view which showed the state which is rough-grinding the tube glass in the manufacturing apparatus of the glass ring shown in FIG. The perspective view which shows the state which has cut | disconnected the glass ring from a tube glass by the multi wheel in the manufacturing apparatus of the glass ring shown in FIG. Schematic showing the condition of grinding tube glass with a rough grinding wheel with inner and outer diameters Schematic showing the condition of grinding the tube glass with the inner and outer diameter finishing grinding wheels Schematic diagram of tube glass that has been ground by the outer diameter grinding wheel device and the inner diameter grinding wheel device The schematic diagram which showed the state which cut | disconnects the tube glass shown in FIG. 7 with a multi wheel. Schematic diagram of glass ring cut by multi-wheel shown in FIG. 1 is a cross-sectional view showing an example of a magnetic disk device.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Glass ring, 20 ... Ring manufacturing apparatus, 22 ... Chuck, 24 ... Motor, 26 ... Rotating device, 28 ... Outer diameter total grinding wheel, 30 ... Motor, 32 ... Outer diameter total grinding wheel apparatus, 34 ... Total inner diameter Shape grinding wheel, 36 ... motor, 38 ... inner diameter overall grinding wheel device, 40 ... inner circumferential chuck bar, 42 ... moving device, 44 ... multi-wheel, 46 ... cutter, 48 ... base, 50 ... mounting plate, 52 ... tube glass , 54 ... Grinding wheel for rough grinding, 56 ... Grinding wheel for finish grinding, 58 ... Ribbed portion, 60 ... Grooved portion, 62 ... Tapered portion, 64 ... Ribbed portion, 66 ... Grooved portion, 68 ... Tapered portion, 70 ... concave groove part, 72 ... concave line cutting line, 74 ... convex line part, 76 ... convex line part, 78 ... outer peripheral edge part, 80 ... chamfer, 82 ... slider, 84 ... guide rail, 86 ... grindstone for rough grinding, 88 ... grinding wheel for finish grinding, 90 ... ridges, 92 ... concave , 94 ... taper part, 96 ... concave line part, 98 ... convex line part, 100 ... concave line part, 102 ... taper part, 104 ... concave line cutting line, 106 ... convex line part, 108 ... convex line part, 110 ... peripheral edge portion, 112 ... chamfer, 114 ... slider, 116 ... slider, 118 ... guide groove, 120 ... rod, 122 ... arm, 124 ... rotating shaft, 126 ... peripheral blade

Claims (6)

The outer peripheral surface of the tube glass is ground by the outer diameter total shape grinding wheel means while holding the tube glass manufactured to a predetermined outer diameter and inner diameter in the rotating means, and rotating the tube glass around its central axis by the rotating means. The outer peripheral surface is ground with a convex portion corresponding to the outer diameter and thickness of the ring, a tapered portion corresponding to the outer peripheral chamfered portion of the ring, and a concave portion for cutting the ring from the tube glass, and the inner diameter The inner peripheral surface of the tube glass is ground by means of a general-purpose grindstone, and a convex strip corresponding to the inner diameter and thickness of the ring, a tapered portion corresponding to the inner peripheral chamfered portion of the ring, and a ring from the tube glass are formed on the inner peripheral surface. Grinding the groove to cut,
Fitting an inner circumferential chuck member to the inner circumferential surface of the ground tube glass,
The tube glass fitted to the inner peripheral chuck member is made of glass from the tube glass by cutting the tube glass outer peripheral surface and the concave portion of the tube glass inner peripheral surface together with a cutting means. A method for producing a glass ring, comprising obtaining the ring. The method for producing a glass ring according to claim 1, wherein the grinding process by the outer diameter total grinding wheel means and the grinding process by the inner diameter total grinding wheel means are performed simultaneously or sequentially. The outer diameter total shape grindstone means and the inner diameter total shape grindstone means have a rough grinding wheel or a finish grinding grindstone, and the tube glass is ground by the rough grinding grindstone or the finish grinding grindstone. The manufacturing method of the glass ring of Claim 1 or 2. The outer diameter total shape grindstone means and the inner diameter total shape grindstone means have a rough grinding grindstone and a finish grinding grindstone, and after the rough grinding by the rough grinding grindstone, the finish grinding by the finish grinding grindstone is performed. The manufacturing method of the glass-made ring of Claim 1 or 2 characterized by the above-mentioned. Rotating means for holding the tube glass manufactured to a predetermined outer diameter and inner diameter, and rotating the tube glass about its central axis;
Grinding the outer peripheral surface of the tube glass held by the rotating means, and forming a ring from the tube glass on the outer peripheral surface, a convex portion corresponding to the outer diameter and thickness of the ring, a tapered portion corresponding to the outer peripheral chamfered portion of the ring, and An outer diameter total shape grinding wheel means for grinding a recess for cutting,
The inner peripheral surface of the tube glass held by the rotating means is ground, and the inner peripheral surface is formed with a convex portion corresponding to the inner diameter and thickness of the ring, a tapered portion corresponding to the inner peripheral chamfered portion of the ring, and the tube glass. An inner diameter total grinding wheel means for grinding a recess for cutting a ring;
An inner peripheral chuck member fitted to an inner peripheral surface of the tube glass ground by the outer diameter total shape grindstone means and the inner diameter total shape grindstone means;
A cutting means for cutting the tube glass fitted to the inner chuck member, and cutting the tube glass by combining the concave portion of the outer peripheral surface of the tube glass and the concave portion of the inner peripheral surface of the tube glass. Cutting means for obtaining a glass ring;
An apparatus for producing a glass ring, comprising: 6. The apparatus for producing a glass ring according to claim 5, wherein the outer diameter total shape grindstone means and the inner diameter total shape grindstone means include a rough grinding grindstone and / or a finish grinding grindstone.

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