TW201313386A - Method for grinding thin sheet-like workpiece and double-end surface grinder - Google Patents

Abstract

To reduce influences of external forces that are to be applied to a carrier ring and improve workpiece grinding precision, and maintain high grinding precision over a long period of time without problems such as wear, etc. In a double-end surface grinder that grinds both surfaces of a thin sheet-like workpiece W by a pair of grinding wheels 3 while rotating the workpiece W via a carrier 4 in a state where the workpiece W fitted to the carrier 4 is supported by static pressures of a pair of static pressure pads 1 in a non-contact manner, a plurality of static pressure carrier guides 6a and 6b that support a carrier ring 5 on the outer periphery of the carrier 4 by static pressures in a non-contact manner are provided in the circumferential direction. The carrier ring 5 has a cylindrical outer peripheral surface 12, and in proximity to the outer peripheral surface 12, static pressure carrier guides 6a and 6b are disposed at substantially even intervals. The static pressure carrier guides 6a and 6b may be fixed or floatable.

Description

Method for grinding thin plate-shaped workpiece and double-sided surface grinder

The present invention relates to a method of polishing a thin plate-shaped workpiece used for polishing a thin plate-shaped workpiece such as a tantalum wafer, and a double-sided surface grinder.

When a thin plate-shaped workpiece such as a tantalum wafer is polished by using a horizontal-axis double-sided surface grinder, a workpiece that is statically supported by a pair of left and right static pressure polishing pads is rotated around the center thereof by a static pressure polishing pad. A pair of left and right grinding wheels that are rotated about the horizontal axis are ground until a predetermined thickness is completed.

Regarding the support method for rotatably supporting the workpiece, there is a direct contact support method that directly contacts the outer circumference of the workpiece (Patent Documents 1 and 2), and a carrier support method for supporting the workpiece through the carrier and the carrier ring (patent Document 3) In addition, the direct contact support method includes a roll support method (Patent Document 1) and a belt support method (Patent Document 2).

The roller support method (Patent Document 1) is constructed such that the outer circumference of the disk-shaped workpiece is rotatably supported in the circumferential direction by a plurality of support rollers, and the workpiece is rotated around the center by any one of the support rollers. The belt support method (Patent Document 2) is constructed such that the outer circumference of the disk-shaped workpiece is supported to be rotatable in the circumferential direction by the two sets of support belts, and the workpiece is rotated around the center by the support belt.

The carrier support method (Patent Document 3) mounts a workpiece on a mounting hole of a thin plate-shaped carrier that is fixed to the carrier ring on the outer circumference, and the carrier ring is provided with a plurality of supports that are substantially equally divided by the outer circumference thereof. The roller is contacted and supported, and the workpiece is rotated around the center by the carrier ring and the carrier by the drive gear of the ring gear meshed on the inner peripheral side of the carrier ring.

Prior art Patent literature

Patent Document 1 Japanese Patent Laid-Open No. Hei 10-175144

Patent Document 2 Japanese Patent Laid-Open No. Hei 10-156681

Patent Document 3 Japanese Patent Laid-Open Publication No. 2005-205528

In the conventional direct contact support method, the outer circumference of the workpiece is directly supported by the support roller or the support belt, and the workpiece is driven to rotate by the support roller or the support belt, and therefore, the workpiece is not capable of grinding the thin plate-shaped workpiece with high precision. The problem.

On the other hand, the carrier support method is to drive a carrier ring supported by the outer peripheral support roller in a state in which the workpiece is fixed to the carrier ring and the workpiece is embedded in the mounting hole. Since it is rotated, there is an advantage that the sheet-like workpiece can be polished with high precision as compared with the direct contact support method. However, the conventional carrier support method employs the contact support method in which the carrier ring is contact-supported by a plurality of support rollers arranged substantially equally on the outer circumference thereof, and thus has the following problems.

That is, in the past, the support was contacted by a plurality of support rollers so as to break into the guide ring, and the vibration of each support roller was transmitted to the carrier ring and combined, so that the rotation accuracy of the workpiece was deteriorated due to the combination thereof. In addition, if the mounting accuracy of the support shaft of the support roller, especially the parallelism with respect to the rotation center of the carrier ring, is poor, the force other than the rotation is transmitted to the carrier ring, and the carrier ring and the workpiece are caused. There is a problem such as tilting.

In addition, the support roller is formed by injection molding a resin material such as high-hardness polyurethane which is not easily damaged by the carrier ring and can reliably support the carrier ring, and is mechanically finished. In this case, in this case, since the support roll is made of resin, there are the following problems. That is, it is difficult to stably achieve the roundness required for the support roller, and it is easy to cause deterioration of the quality of the support roller over time, and it is more likely to cause problems such as friction loss of the support roller.

The present invention has been made in view of the problems of the prior art, and an object thereof is to provide a method for polishing a thin plate-like workpiece and a double-sided surface grinder which can reduce the influence of force applied to the carrier ring and improve the grinding precision of the workpiece, and There is no problem such as friction, and good polishing precision can be maintained for a long time.

The method for polishing a thin plate-shaped workpiece according to the present invention is to non-contact statically support a thin plate-shaped workpiece mounted on a carrier by a pair of static pressure polishing pads, and to rotate the workpiece through the carrier while rotating the workpiece When a pair of grinding wheels grind both sides of the workpiece, the carrier rings of the outer periphery of the carrier are statically supported in a circumferential direction by a plurality of static-pressure carrier guides in a non-contact manner.

The double-sided surface grinder of the present invention is a non-contact static pressure supporting support of a thin plate-shaped workpiece mounted on a carrier by a pair of static pressure polishing pads, and the workpiece is rotated by the carrier while being rotated by a pair of grinding The grinding wheel grinds both sides of the workpiece, the double-sided surface grinding machine having a plurality of non-contact static pressure carrier guides for non-contact static support of the carrier ring around the carrier.

The carrier ring may have a cylindrical outer peripheral surface, and the static pressure carrier guides may be disposed substantially equally to the outer circumferential surface. The static pressure carrier guide can also be fixed. In addition, the static pressure carrier guide can also float.

The static pressure carrier guides may be pivotally supported by a floating shaft substantially parallel to the rotation center of the carrier ring, and the static pressure carrier guides are provided with static pressure holes at the load. The ring is substantially symmetrical with respect to the floating axis in the direction of rotation, and a hydrostatic fluid is supplied between the outer circumferential surface of the carrier ring.

The support arm can also be pivotally supported by a pivot substantially parallel to the center of rotation of the carrier ring, and can support at least a portion of the static movement away from or in proximity to the carrier ring. a ballast ring; a drive mechanism that rotates the support arm about the pivot; and a stop mechanism that stops the support arm in a predetermined position.

The static pressure carrier guide can also be changed to a fixed state and a floating state in which a floating axis that is substantially parallel to the center of rotation of the carrier ring floats.

It is also possible to provide three or more static-pressure carrier guides that are arranged substantially equally in the outer circumference of the carrier ring, and that include a gap adjustment mechanism that is three or more in the substantially radial direction of the carrier ring. Adjusting the position of at least one of the static pressure carrier guides to adjust the static pressure surface of the three or more static pressure carrier guides and the outer circumference of the carrier ring Clearance.

According to the present invention, since the static pressure carrier guide is used to statically support the carrier ring, there is a problem that the influence of the force applied to the carrier ring can be reduced, the polishing precision of the workpiece can be improved, and friction or the like is not generated. The advantage of maintaining good grinding accuracy over a long period of time.

Hereinafter, each embodiment of the present invention will be described in detail with reference to the drawings. The drawing is a illustration of a horizontal double-sided surface grinder using the present invention. The horizontal double-sided surface grinder, as shown in the first and second figures, has a pair of right and left static pressure polishing pads 1, which are disposed opposite to each other and are statically supported in a non-contact manner to support the thin plate-like workpiece W; A pair of left and right grinding wheels 3 corresponding to the notch portions 2 of the static pressure polishing pads 1 are rotatably arranged around the grinding wheel shaft in the left and right direction, and are moved toward the axis of the cutting axis, thereby The left and right sides of the workpiece W supported by the pressure polishing pad 1 are ground; the carrier 4 rotates the mounted workpiece W around the axis of the cutting axis while being held by the static pressure polishing pad 1; the carrier ring 5, which supports the outer circumference of the carrier 4; and a plurality of static pressure carrier guides 6a, 6b, which are arranged substantially equally in the outer circumference of the carrier ring 5, and the carrier ring 5 is non-contacted from the outer circumference The static pressure support is rotatable.

Each of the static pressure polishing pads 1 is configured to be disposed on the opposite end side of the pair of right and left movable stages 8 that are movable in the axial direction of the cutting axis, and is capable of retracting from the workpiece W before the workpiece W is held. The retracted position is freely moved in the direction of the cutting axis, and the static pressure fluid such as static pressure water supplied to the static pressure side facing the workpiece W is transmitted through the advanced position, and the workpiece W is statically supported in a non-contact manner.

The carrier 4 is a thin plate-shaped circular plate which is thinner than the finished size of the workpiece W, and has a mounting hole 9 which is substantially concentric, and the workpiece W can be detachably mounted. As shown in the first to fourth figures, the carrier 4 is fixed to the carrier ring 5 by the carrier ring 5 arranged substantially concentrically on the outer circumference thereof, and the outer circumference of the carrier 4 is directed toward the carrier ring 5 side. Pressed on the pressure ring 10 support. The carrier ring 5 has a cylindrical outer peripheral surface 12 formed substantially in a concentric shape with respect to the center of rotation of the carrier 4, and the end faces on both sides in the axial direction and the static pressure surface of the static pressure polishing pad 1 The step portion 11 on the outer peripheral side faces each other with a gap therebetween. The carrier 4, the carrier ring, and the pressure ring 10 constitute the carrier mechanism 7, and the access of the workpiece W is integrally accessed with the carrier mechanism 7.

Further, the carrier ring 5 is made of a ceramic material such as alumina which is thin and has a good roundness, but may be made of a metal such as stainless steel. A ring gear 13 is provided on the inner circumference of the pressure ring 10, and the carrier mechanism 7 including the carrier 4 and the carrier ring 5 is rotationally driven by the drive gear 14 engaged with the ring gear 13.

Each of the static-pressure carrier guides 6a, 6b is attached to the opposite end side of the carrier 4 of the movable table 8, and is arranged substantially equally in the circumferential direction on the outer circumference of the carrier ring 5. the above. For example, in the present embodiment, four static-pressure carrier guides 6a, 6b are arranged substantially equally, and as shown in the third, fourth, and sixth figures, each of the static-pressure carrier guides 6a 6b is pivotally connected to the movable table 8 via the floating shafts 15a, 15b, and is fixed in a more fixed state and a floating state by the fixing mechanisms 16a, 16b and the restricting mechanisms 17a, 17b.

As shown in FIGS. 7 and 8, each of the static-pressure carrier guides 6a, 6b is formed with a floating shaft 15a, 15b substantially at the center of the carrier ring 5 in the rotational direction (hereinafter, simply referred to as the rotational direction). The shaft hole 20 is inserted, and two pin holes 21 disposed on both sides of the shaft hole 20 and a static gap 22 opposite to the outer peripheral surface 12 of the carrier ring 5 are provided. Two static pressure holes 23 on the pressure surface 22 side and two static pressure holes 23 Escape slot 24. The floating shafts 15a, 15b, the pin holes 21, and the shaft holes 20 are substantially parallel to the rotation axis and the cutting axis of the carrier ring 5, and the pin holes 21 are arranged substantially symmetrically with respect to the shaft holes 20 on both sides in the rotation direction.

The static pressure surface 22 of each of the hydrostatic carrier guides 6a, 6b is formed in an arc shape along the outer peripheral surface 12 of the carrier ring 5, and is spaced apart from the outer peripheral surface 12 of the carrier ring 5 by a slight gap ( For example, 10 to 30 μm) and opposed in the diametrical direction. The static pressure hole 23 is for supplying static pressure fluid such as static pressure water between the static pressure surface 22 of the static pressure carrier guides 6a, 6b and the outer circumferential surface 12 of the carrier ring 5, which is subjected to static pressure. The surface 22 is recessed and has a long length in the rotation direction, and is disposed substantially symmetrically with respect to the floating shafts 15a, 15b and the shaft holes 20 on both sides in the rotational direction. Each of the static pressure holes 23 is connected to the supply source 29 of the hydrostatic fluid from the inner communication hole 25 through the flexible hose 26 or the like on the opposite side of the static pressure surface 22.

The two hydrostatic carrier guides 6a, 6b of the hydrostatic carrier guides 6a, 6b facing the diametrical direction of the carrier ring 5 are connected through the same circuit 27 as shown in FIG. The source 29 is a static pressure fluid. Further, a pressure regulating valve 30 and a flow meter 31 are installed in each circuit 27, and the pressure and flow rate are managed by these devices.

As shown in the third, fourth, and sixth figures, the two hydrostatic carrier guides 6a, 6b on the upper side are mounted on the support arm pivotally connected to the movable table 8 by the pivot 33. 34. When the loader mechanism 7 is removed, the support arm 34 is pivoted about the pivot 33 by the drive mechanism 19 to move the upper static pressure carrier guide 6a away from or near the carrier ring 5. The pivot 33 is substantially parallel to the floating shaft 15a.

On one end side of the support arm 34, a static pressure carrier guide 6a is mounted in the housing portion 35, and a cylinder 36 constituting the drive mechanism 19 is coupled to the other end. As shown in the fourth and sixth figures, the accommodating portion 35 is provided between the side walls 35a and 35b of the support arm 34 in the radial direction of the carrier ring 5, and the static pressure carrier guide is accommodated in the accommodating portion 35. The lead member 6a and the static-pressure carrier guide 6a are pivotally supported by the floating shaft 15a of the support arm 34 through the side walls 35a, 35b on both sides of the accommodating portion 35. As shown in the third and sixth figures, the static pressure carrier guide 6a in the accommodating portion 35 can be fixed to the support arm 34 at an appropriate angle by the fixing mechanism 16a, and when the fixing mechanism 16a is released, It can float within the floating range limited by the control mechanism 17a.

The fixing mechanism 16a has a fixing pin 39 that is press-fitted into one of the pin holes 21 of the static-pressure carrier guide 6a and a pin hole 38b that is removably fitted with the fixing pin 39 and is detachably mounted to A mounting bracket 38 that supports the side of the arm 34. The fixing bracket 38 is detachably pivotally connected to the support arm 34 by the fixing bolt 40 on the base side, and the adjusting bolt 41 screwed to the side of the support arm 34 through the long hole 38a surrounds the fixing bolt 40. Adjust the angle. The pin hole 38b is fastened to the front end of the fixing bracket 38, and the removably insertable fixing pin 39 is fitted into the pin hole 38b. The control mechanism 17a is composed of another pin hole 21 of the static pressure carrier guide 6a and a restriction pin 42 that penetrates the housing portion 35 and is inserted through the pin hole 21, and is disposed between the restriction pin 42 and the pin hole 21. Corresponds to the gap of the floating range.

The cylinder 36 is interposed between the coupling pin 44 of the support arm 34 and the pivot pin 45 of the movable table 8, and swings the support arm 34 about the pivot 33 to move the static pressure carrier guide 6a away or close. The direction of the carrier ring 5 (substantially straight The direction of the movement). A stopper mechanism 47 for stopping the support arm 34 at a predetermined position is provided on one end side of the support arm 34.

As shown in FIGS. 3 and 6, the stopper mechanism 47 has an abutting portion 48 fixed to the movable table 8 and a screw stopper 49 that is adjustably screwed to one end side of the support arm 34, by adjusting The stopper 49 changes the interval between the static pressure surfaces 22 of the static-pressure carrier guides 6a, 6b on both sides in the diameter direction of the carrier ring 5, and the gap can be adjusted so that the carrier ring 5 can be located at the two positions. At substantially the center between the ballast guides 6a, 6b. Thereby, the stopper mechanism 47 can also serve as a gap adjustment mechanism for adjusting the gap between the static pressure surface 22 of the static pressure carrier guide 6a and the outer circumferential surface 12 of the carrier ring 5.

As shown in the third, fifth, tenth, and eleventh figures, the two static-pressure carrier guides 6b on the lower side pass through the fixing mechanism 16b including the floating shaft 15b and the fixing bracket 50 (refer to the third and the third 5. Fig. 10) and the restriction mechanism 17b (see Fig. 11) are detachably mounted in a fixed state and a floating state.

The floating shaft 15b is fixed to the movable table 8. The fixing bracket 50 is installed such that one end side in the longitudinal direction can be inverted with respect to the floating shaft 15b and can be adjusted around the floating shaft 15b. Further, the fixing hole 53 is provided on the other end side and a larger diameter than the fixing hole 53 is provided. Floating recess 54. The static pressure carrier guide 6b is pivotally supported by the floating shaft 15b, and the engagement pin 55 is press-fitted into the other pin hole 21. The amount of projection of the engaging pin 55 toward the fixing bracket 50 is such that the floating recess 54 does not engage with the fixing hole 53 when it faces the hydrostatic carrier guide 6b side.

As shown in the third, fifth, and tenth views, the fixing mechanism 16b for fixing the static pressure carrier guide 6b is composed of the engaging pin 55 and the fixing bracket 50. The pin hole 21 is formed by inserting the engaging pin 55 into the pin hole 21 for fixing the static pressure carrier guide 6b.

In addition, as shown in FIG. 1, the restricting mechanism 17b for restricting the floating range of the static-pressure carrier guide 6b is constituted by the engaging pin 55 and the floating recess 54 of the fixing bracket 50, and is constructed in the engaging pin. The gap between the two when entering the floating recess 54 corresponds to the floating range of the static-pressure carrier guide 6b.

On one end side of the fixing bracket 50, a gripping portion 56 for gripping the base portion of the floating shaft 15b and a fastening bolt 57 for fastening the grip portion 56 are provided, and the fixing bracket 50 is angularly adjustable with respect to the floating shaft 15b. Further, the fixing hole 53 and the floating recess 54 are formed long in the longitudinal direction of the fixing bracket 50, and the fixing bracket 50 can be angularly adjusted around the floating shaft 15b.

At the time of polishing the workpiece W, the workpiece W mounted on the carrier 4 is statically supported by the pair of static pressure polishing pads 1 from the left and right sides in a non-contact manner, and is substantially four times from the outer circumference of the carrier ring 5. The static pressure holes 23 of the respective static pressure carrier guides 6a, 6b are supplied with static pressure fluid toward the outer peripheral surface 12 of the carrier ring 5, and the static pressure carrier guides 6a, 6b are passed through the static pressure. The fluid is statically pressed in a non-contact manner to support the carrier ring 5, and the carrier gear 5 is driven by the driving gear 14 and transmitted through the internal gear 13, so that the workpiece W mounted on the carrier 4 is rotated about its rotation axis, and by one The grinding wheel 3 is used to grind both sides of the workpiece W up to a predetermined finished size.

According to the above, the carrier ring 5 can be statically supported in a non-contact manner by the peripheral static-pressure carrier guides 6a, 6b. That is, the hydrostatic fluid from the hydrostatic carrier guides 6a, 6b is supplied between the outer peripheral faces 12 of the carrier ring 5, whereby the hydrostatic carrier guides 6a, 6b can be thereby provided. Static pressure The fluid is statically supported to support the carrier ring 5 from the outer peripheral side in a non-contact manner. On the other hand, between the end faces of the carrier ring 5, the static pressure fluid supplied from each of the static pressure polishing pads 1 is supplied in the same manner as in the related art, and the static pressure polishing pad 1 can be passed through the static pressure fluid. Static support in a non-contact manner.

Therefore, the outer circumference and the both end faces of the carrier ring 5 are statically supported in a non-contact manner, and the self-loading ring 5 is in the grinding cycle as compared with the conventional contact support mode in which the carrier ring 5 is supported by the guide roller. The external force applied to the workpiece W by the carrier 4 is reduced, and the rotation accuracy of the workpiece W (mainly peripheral vibration) can be improved. Therefore, the grinding accuracy of the workpiece W can be improved.

Further, since the static pressure carrier guides 6a, 6b are statically and rotatably supported by the static pressure fluid in a non-contact manner and statically support the carrier ring 5, there is no case where the contact support method is used. The problem of friction loss caused by the contact of the members with each other can maintain a good rotation accuracy semi-permanently. Therefore, it is possible to prevent deterioration of polishing precision of the workpiece W due to friction loss or the like, increase in maintenance man-hours, and occurrence of cost of consumables.

Further, in each of the static-pressure carrier guides 6a, 6b which are disposed substantially in the outer circumference of the carrier ring 5, the static-pressure carrier guides 6a are disposed on both sides in the radial direction of the carrier ring 5, 6b, as shown in Fig. 3, is connected to the same circuit 27 where the pressure and flow rate of the hydrostatic fluid are very large, so that the static pressure surface 22 of the static pressure carrier guides 6a, 6b and the carrier ring 5 When the gap between the outer peripheral surfaces 12 is changed, the force for concentrating the pressure in the same circuit 27 is exerted, and since the carrier ring 5 is intended to be held at a fixed position, stable rotation accuracy can be obtained.

That is, the pressure balance of one of the opposing counterstatic carrier guides 6a, 6b is broken for unknown reasons, for example, in the gap between the lower static pressure carrier guide 6b and the carrier ring 5. In the case of narrowing, the pressure in the static pressure hole 23 of the static pressure carrier guide 6b rises. On the other hand, when the gap between the upper static-pressure carrier guide 6a and the carrier ring 5 is widened, the pressure in the static pressure hole 23 of the static-pressure carrier guide 6a is lowered. Therefore, the carrier ring 5 is moved by the pressure difference between the static pressure holes 23 of the two static pressure carrier guides 6a, 6b so that the gap between the two static pressure carrier guides 6a, 6b is equal, thereby Make sure it is in a fixed position.

The outer peripheral surface 12 of the carrier ring 5 is a cylindrical surface that is substantially concentric with respect to the center of rotation of the carrier 4, and is a shape of a groove that does not escape from the pressure of the hydrostatic fluid, and the static pressure carrier guide 6a. The static pressure surface 22 of the 6b is close to the outer circumferential surface 12 of the carrier ring 5 with a small gap therebetween. Therefore, the carrier ring 5 can be supported by the hydrostatic fluid stability, and the carrier ring 5 can be obtained. Stable rotation accuracy. Further, the static pressure surface 22 of each of the hydrostatic carrier guides 6a, 6b has two static pressure holes 23 in the direction of rotation of the carrier ring 5, and is formed by a half of the escape groove 24 in the middle. The pressure of the hydrostatic fluid on both sides of the rotation direction of the carrier ring 5 can be balanced by the individual of each of the static pressure carrier guides 6a, 6b.

When the carrier mechanism 7 is disassembled, the support arm 34 is swung around the pivot 33 in the direction indicated by the arrow a in FIG. 3 by the cylinder 36 as shown by the broken line in FIG. 3, so that the upper two are static. The ballast guide 6a is separated from the diameter of the carrier ring 5. Further, after the carrier ring 5 enters the predetermined position, the support arm 34 is rotated about the pivot 33 in the opposite direction indicated by the arrow a by the cylinder 36. Then, when the static pressure surface of the upper static pressure carrier guide 6a When the outer peripheral surface 12 of the carrier ring 5 reaches a predetermined gap, the stopper 49 abuts against the abutting portion 48, thereby restricting the rotation of the support arm 34.

Thus, the upper side static-pressure carrier guide 6a is moved by the cylinder 36 driving the support arm 34, so that a pair of static-pressure carrier guides 6a, 6b disposed on both sides in the diameter direction of the carrier ring 5 are provided. The interval between the two changes, so that the entry and exit of the carrier ring 5 can be easily performed, and automation can be easily achieved.

Further, by adjusting the position at which the screw stopper 49 of the stopper mechanism 47 abuts against the abutting portion 48, the static pressure surface 22 of each of the hydrostatic carrier guides 6a, 6b and the carrier can be arbitrarily adjusted. The gap of the outer peripheral surface 12 of the ring 5. That is, by adjusting the stopper 49, the position of the support arm 34 when the stopper 49 abuts against the abutment portion 48 is changed, so that the static pressure carrier guide 6a on both sides in the diameter direction of the carrier ring 5 The interval between the static pressure faces 22 varies. Further, when the hydrostatic carrier guides 6a, 6b on both sides in the diametrical direction of the carrier ring 5 supply static fluid to the outer periphery of the carrier ring 5, the carrier ring 5 is located at the two static pressure carrier guides. The center of the outer peripheral surface 12 of the carrier ring 5 and the static pressure surface 22 of the hydrostatic carrier guide 6a on both sides substantially coincide with each other between the centers 6a and 6b. Thereby, the static pressure surfaces of the static-pressure carrier guides 6a, 6b can be adjusted according to the interval between the static pressure surfaces 22 of the static-pressure carrier guides 6a, 6b on both sides in the diameter direction of the carrier ring 5. 22 is spaced from the outer peripheral surface 12 of the carrier ring 5.

Each of the hydrostatic carrier guides 6a, 6b can be changed to a more fixed state and a floating state, and can be appropriately distinguished by changing the program as needed. For example, in the case where the true roundness of the carrier ring 5 is high and the support carrier ring 5 can be statically supported, the static-pressure carrier guides 6a, 6b can be set to a fixed state, and the carrier can be fixed. When the true roundness of the ring 5 is low, each can be quiet. The ballast guides 6a, 6b are set to be in a floating state. Further, the two static-pressure carrier guides 6b on the lower side may be fixed, and the two static-pressure carrier guides 6a on the upper side may be in a floating state.

The third and sixth figures show the state in which the hydrostatic carrier guides 6a, 6b are fixed. When the upper static-pressure carrier guide 6a is fixed, as shown in the third, fifth, sixth, and tenth views, the fixing pin 39 of the static-pressure carrier guide 6a is inserted into the fixing bracket 38. The pin hole 38b is pivotally connected to the support arm 34 by a fixing bolt 40. In this state, when the fixing bracket 38 is rotated around the fixing bolt 40 within the range of the long hole 38a, the static pressure carrier guiding member 6a is rotated about the floating shaft 15a, and on both sides of the floating shaft 15a, static ballast Since the gap between the static pressure surface 22 having the guide member 6a and the outer circumferential surface 12 of the carrier ring 5 is changed, the adjustment bolts 41 may be screwed to the both sides of the floating shaft 15a so as to be substantially equal to the gap.

Further, since the amount of adjustment of the static-pressure carrier guide 6a at the time of fixing is generally within the range of the gap with the regulating pin 42 of the pin hole 21, the regulating pin 42 can be maintained in the state of being inserted into the pin hole 21. . Further, the size of the gap between the static pressure surface 22 of the static pressure carrier guide 6a and the outer circumferential surface 12 of the carrier ring 5 can be appropriately adjusted by the stopper mechanism 47.

When the lower static pressure carrier guide 6b is fixed, as shown in FIGS. 5 and 10, the engagement pin 55 is inserted into the static pressure carrier guide 6b and the fixing hole 53 of the fixing bracket 50. The angle of the fixing bracket 50 is adjusted around the floating shaft 15b on the two sides of the floating shaft 15b so that the gap between the static pressure surface 22 of the static pressure carrier guide 6b and the outer circumferential surface 12 of the carrier ring 5 is substantially equal. After that, the fastening bolt 57 is tightened to fix the fixing bracket 50 to Floating shaft 15b. Thereby, the lower static pressure carrier guide 6b is in a fixed state.

Thus, even in the case where the hydrostatic carrier guides 6a, 6b are fixed, the static pressure faces 22 of the hydrostatic carrier guides 6a, 6b have two static pressure holes 23, and since then The static pressure hole 23 supplies the static pressure fluid to the outer peripheral surface 12 of the carrier ring 5, so that the carrier ring 5 can be supported by static pressure hydrostatic pressure. Further, since the hydrostatic carrier guides 6a, 6b are in a fixed state, it is possible to prevent the carrier ring 5 from being loosened and to reliably press the support carrier ring 5.

When the upper static-pressure carrier guide 6a is in the floating state, the fixing pin 39 of the static-pressure carrier guide 6a is detached from the pin hole 38b of the fixing bracket 38 as long as the fixing bracket 38 is removed. The fixing of the static pressure carrier guide 6a by the fixing mechanism 16a can be released. Thereby, the hydrostatic carrier guide 6a can be floated around the floating shaft 15a within the range of the gap between the pin 42 and the pin hole 21.

Further, when the lower static-pressure carrier guide 6b is in a floating state, as shown in Fig. 11, the fixing bracket 50 is turned over, and the static pressure is floatably installed within the range of the restriction mechanism 17b. Carrier guide 6b. First, the static pressure carrier guide 6b is initially detached from the floating shaft 15b, and the fixed bracket 50 is turned over and attached to the floating shaft 15b. Next, the static pressure carrier guide 6b is nested in the floating shaft 15b, and the engagement pin 55 is engaged in the floating recess 54 of the fixing bracket 50.

Then, on both sides of the floating shaft 15b, the fixing bracket 50 is adjusted around the floating shaft 15b so that the gap between the static pressure surface 22 of the static pressure carrier guide 6b and the outer circumferential surface 12 of the carrier ring 5 is substantially equal. The fastening bolt 57 is fixed. Thereby, the static-pressure carrier guide 6b can be floated around the floating shaft 15b within the range of the gap between the engaging pin 55 and the floating recess 54.

Thus, after the hydrostatic carrier guides 6a, 6b are floatably disposed, the hydrostatic fluid is supplied from the static pressure holes 23 of the hydrostatic carrier guides 6a, 6b toward the outer peripheral surface 12 of the carrier ring 5. The carrier ring 5 can be supported by this hydrostatic hydrostatic pressure. Further, on both sides of the floating shafts 15a, 15b, when there is a difference between the static pressure surface 22 of the static-pressure carrier guides 6a, 6b and the outer peripheral surface 12 of the carrier ring 5, the floating shafts 15a, 15b The static pressure carrier guides 6a, 6b float around the floating shafts 15a, 15b in such a manner that the gaps on both sides are substantially uniform. Therefore, the contact of the hydrostatic carrier guides 6a, 6b with the carrier ring 5 can be prevented in advance. Further, since the restriction mechanisms 17a, 17b for restricting the floating range of the static-pressure carrier guides 6a, 6b are provided, the instability of the static-pressure carrier guides 6a, 6b around the floating shafts 15a, 15b can be prevented. Swing and so on.

In addition to the fact that all of the static-pressure carrier guides 6a, 6b can be used in a fixed state or a floating state, for example, the two static-pressure carrier guides 6b on the lower side can be fixed and mounted on The two hydrostatic carrier guides 6a on the upper side of the support arm 34 are floated around the floating shafts 15a, 15b for use. In this case, the gap between the static pressure surface 22 of the static-pressure carrier guides 6a and 6b and the outer circumferential surface 12 of the carrier ring 5 can be reduced while the carrier ring 5 can be easily attached and detached. The support carrier ring 5 can be stably hydrostatically supported.

That is, in the case where the upper static-pressure carrier guide 6a is mounted on the support arm 34 that rotates about the pivot 33, if the static-pressure carrier guide 6a is fixed to the support arm 34, The accumulation of the error or the like may cause the static pressure carrier guide 6a to contact the carrier ring 5, making it difficult to reduce the gap between the static pressure carrier guides 6a, 6b and the carrier ring 5. But borrow By mounting the hydrostatic carrier guide 6a on the support arm 43 in a floating manner, the static pressure surface 22 of the static pressure carrier guides 6a, 6b and the outer peripheral surface 12 of the carrier ring 5 can be reduced. The gap is prevented from coming into contact with the carrier ring 5 by the floating of the upper static pressure carrier guide 6a.

By the way, in the case of using the ceramic carrier ring 5, the result of verifying the contact support mode of the present invention and the contact support method of the prior art support roller, in the non-contact support mode of the present invention, and the prior art In comparison with the contact support method, the peripheral vibration of the carrier ring 5 can be suppressed to about 1/5. Fig. 12 shows the measurement results of the roundness of the carrier ring 5. Fig. 13 shows the case of the contact support method of the prior art, and Fig. 14 shows the measurement results of the peripheral vibration of each of the carrier rings 5 in the case of the non-contact support mode of the present invention.

As shown in Fig. 12, the carrier ring 5 is made of ceramic having a peripheral roundness of about 5 μm (measured value of 4.5 μm), and various methods of the prior art contact support method and the non-contact support method of the present invention. The outer peripheral vibration of the carrier ring 5 was measured. In the case of the prior art contact support mode, as shown in Fig. 13, the measured value of the peripheral vibration is about 15 μm, and when the roundness of the circumference of the carrier ring 5 is subtracted from this value (about 5 μm), the outer circumference The vibration is about 10 μm. On the other hand, as shown in Fig. 14, the measured value of the vibration in the case of the non-contact support mode is about 7 μm, and when the roundness of the circumference of the carrier ring 5 is subtracted from this value (about 5 μm), the outer circumference The vibration is about 2 μm.

As a result of the above verification, in the non-contact support method of the present invention, the peripheral vibration of the carrier ring 5 can be suppressed to about 1/5 as compared with the contact support method of the prior art. Therefore, the rotation accuracy of the carrier ring 5 is transparent. The overloading tool 4 is directly transmitted to the workpiece W connected to the inner circumference thereof, and acts on the grinding point of the workpiece W which is fixed by the pair of grinding wheels 4 during the grinding cycle, and immediately affects the grinding of the workpiece W, but borrows By adopting the non-contact support method of the present invention, the influence of the vibration of the outer circumference of the carrier ring 5 can be reduced, and the stable polishing precision of the workpiece W can be obtained.

The embodiments of the present invention have been described in detail above, but the present invention is not limited thereto, and various modifications can be made without departing from the spirit and scope of the invention. For example, in the embodiment, each of the static-pressure carrier guides 6a, 6b may be changed to a fixed state and a floating state, but all of the static-pressure carrier guides 6a, 6b may be fixed or floating. Alternatively, the plurality of static-pressure carrier guides 6b on the lower side may be fixed, and the plurality of static-pressure carrier guides 6a on the upper side may be in a floating type.

It is preferable that the static pressure carrier guides 6a, 6b are substantially equally distributed on the outer circumference of the carrier ring 5, but the carrier ring 5 can be statically supported by a plurality of static pressure carrier guides 6a, 6b. It does not need to be roughly halved. In addition, when the static pressure carrier guides 6a and 6b are arranged substantially equally, the static pressure carrier guides 6a and 6b may be three or more. Further, in the case where there are three static-pressure carrier guides 6a, 6b, for example, two static-pressure carrier guides 6b are disposed on the lower side, and one static-pressure carrier guide on the upper side is provided. 6a is movably disposed in the diameter direction of the carrier ring 5.

When the static pressure surface 22 of the static pressure carrier guides 6a, 6b is provided with the static pressure holes 23 substantially symmetrically with respect to the floating shafts 15a, 15b in the rotational direction, it may be divided into half in the rotational direction as exemplified in the embodiment. For configuration, it is also possible to continuously set a long static pressure point in the direction of rotation. twenty three. The drive mechanism 19 for driving the support arm 34, in addition to the cylinder 36, may be constituted by a motor, and the support arm 34 is driven by a motor through a screw or a gear.

In the case where the hydrostatic carrier guides 6a, 6b are moved away from or in the direction of the carrier ring 5, a guide mechanism of the carrier ring 5 in the substantially diametric direction may be provided on the movable table 8, along which The guiding mechanism is movably provided with the static pressure carrier guides 6a, 6b. Further, in the embodiment, the stopper mechanism 47 for stopping the support arm 34 at a predetermined position and the static pressure surface 22 of the static pressure carrier guides 6a, 6b and the outer circumferential surface 12 of the carrier ring 5 are provided. The gap adjustment mechanism of the gap is used in combination, but the two can also be separately provided.

All of the hydrostatic carrier guides 6a, 6b can be connected to the supply 29 of hydrostatic fluid via the same circuit 27, or the hydrostatic carrier guides 6a, 6b can be connected via separate independent pressure control circuits. At the supply source 29. Further, in the embodiment, the horizontal surface grinder is exemplified, but the vertical type may be similarly implemented. Further, as long as the workpiece W is a thin plate, it is not limited to any workpiece.

W‧‧‧Workpiece

1‧‧‧Static pressure polishing pad

2‧‧‧Gap section

3‧‧‧ Grinding wheel

4‧‧‧ Vehicles

5‧‧‧Carriage ring

6a, 6b‧‧‧Static press carrier guides

7‧‧‧Carriage

8‧‧‧ activity table

9‧‧‧Installation hole

10‧‧‧ Pressure ring

11 ‧ ‧ steps

12‧‧‧ outer perimeter

13‧‧‧ring gear

14‧‧‧ drive gear

15a, 15b‧‧‧ floating shaft

16a, 16b‧‧‧fixed institutions

17a, 17b‧‧‧Restricted institutions

19‧‧‧ drive mechanism

20‧‧‧Axis hole

21‧‧‧ pinhole

22‧‧‧Static pressure surface

23‧‧‧ Static pressure points

24‧‧‧ escape trough

25‧‧‧Connected holes

26‧‧‧Flexible hose

27‧‧‧ Circuit

29‧‧‧Supply source

30‧‧‧Pressure adjustment valve

31‧‧‧ Flowmeter

33‧‧‧ pivot

34‧‧‧Support arm

35‧‧‧ Housing Department

35a‧‧‧ side wall

36‧‧‧Cylinder block

38‧‧‧Fixed bracket

38a‧‧‧Long hole

38b‧‧‧ pinhole

39‧‧‧fixed pin

40‧‧‧ fixing bolts

41‧‧‧Adjustment bolts

42‧‧‧Restriction pin

44‧‧‧Links

45‧‧‧ pivot

47‧‧‧stop mechanism (gap adjustment mechanism)

48‧‧‧Apartment

49‧‧‧stops

50‧‧‧Fixed bracket

53‧‧‧Fixed holes

54‧‧‧Floating recess

55‧‧‧ card sales

56‧‧‧The Department of Control

57‧‧‧ fastening bolts

Fig. 1 is a schematic side view showing a horizontal double-sided surface grinder according to an embodiment of the present invention.

Fig. 2 is a schematic cross-sectional view.

Figure 3 is an enlarged side view of the main part.

Fig. 4 is an enlarged cross-sectional view showing the support portion of the hydrostatic carrier guide of the upper side.

Fig. 5 is a cross-sectional view showing a state in which the static pressure carrier guide is fixed. Fig. 6 is a cross-sectional view taken along line X-X of Fig. 3.

Figure 7 is a cross-sectional view of the same static pressure carrier guide.

Figure 8 is a bottom plan view of the same static pressure carrier guide.

Figure 9 is a static pressure circuit diagram of the same static pressure carrier guide.

Fig. 10 is a cross-sectional view taken along line Y-Y of Fig. 3.

Figure 11 is a cross-sectional view showing the floating state of the same static pressure carrier guide.

Figure 12 is a schematic diagram showing the measurement results of the roundness of the carrier ring.

Figure 13 is a schematic illustration of the measurement results of the peripheral vibration of the carrier ring supported by the prior art contact support.

Fig. 14 is a view showing the measurement results of the vibration of the outer circumference of the carrier ring supported by the non-contact support method of the present invention.

W‧‧‧Workpiece

2‧‧‧Gap section

3‧‧‧ Grinding wheel

4‧‧‧ Vehicles

5‧‧‧Carriage ring

6a, 6b‧‧‧Static press carrier guides

7‧‧‧Carriage

9‧‧‧Installation hole

10‧‧‧ Pressure ring

12‧‧‧ outer perimeter

14‧‧‧ drive gear

15a, 15b‧‧‧ floating shaft

16a, 16b‧‧‧fixed institutions

17a‧‧‧Restricted institutions

19‧‧‧ drive mechanism

21‧‧‧ pinhole

22‧‧‧Static pressure surface

23‧‧‧ Static pressure points

24‧‧‧ escape trough

33‧‧‧ pivot

34‧‧‧Support arm

35‧‧‧ Housing Department

35a‧‧‧ side wall

36‧‧‧Cylinder block

38‧‧‧Fixed bracket

38a‧‧‧Long hole

38b‧‧‧ pinhole

39‧‧‧fixed pin

40‧‧‧ fixing bolts

41‧‧‧Adjustment bolts

42‧‧‧Restriction pin

44‧‧‧Links

45‧‧‧ pivot

47‧‧‧stop mechanism (gap adjustment) Entire institution)

48‧‧‧Apartment

49‧‧‧stops

50‧‧‧Fixed bracket

53‧‧‧Fixed holes

54‧‧‧Floating recess

55‧‧‧ card sales

56‧‧‧The Department of Control

57‧‧‧ fastening bolts

Claims (9)

A method for polishing a thin plate-shaped workpiece, wherein a workpiece is mounted on a thin plate-shaped workpiece mounted on a carrier by a pair of static pressure polishing pads in a non-contact manner, and the workpiece is rotated by the carrier. When both sides of the workpiece are ground by a pair of grinding wheels, the carrier rings of the outer periphery of the carrier are statically supported in a non-contact manner by a plurality of hydrostatic carrier guides in a circumferential direction. A double-sided surface grinder is a non-contact static pressure supporting a thin plate-shaped workpiece mounted on a carrier by a pair of static pressure polishing pads, and rotating the workpiece through the carrier while rotating a pair of grinding wheels The two sides of the workpiece are ground. The double-sided surface grinder is characterized by a plurality of hydrostatic carrier guides in the circumferential direction that statically support the carrier ring of the outer periphery of the carrier in a non-contact manner. A double-sided surface grinder according to claim 2, wherein the carrier ring has a cylindrical outer peripheral surface, and the hydrostatic carrier guides are arranged substantially equally in proximity to the outer peripheral surface. A double-sided surface grinder as claimed in claim 2, wherein the hydrostatic carrier guide is fixed. A double-sided surface grinder as claimed in claim 2, wherein the hydrostatic carrier guide is floatable. The double-sided surface grinder of any one of claims 2 to 5, wherein each of the static pressure carrier guides is pivotally supported by a floating shaft substantially parallel to a center of rotation of the carrier ring, each of the static The ballast guide has a static pressure hole that is substantially symmetrical with respect to the floating shaft in the direction of rotation of the carrier ring for supplying static pressure fluid to the outer circumferential surface of the carrier ring. A double-sided surface grinder according to any one of claims 2 to 6, wherein: a support arm pivotally supported by a pivot substantially parallel to a center of rotation of the carrier ring, and At least a portion of the hydrostatic carrier ring is supported for movement away from or proximate to the carrier ring; a drive mechanism that rotates the support arm about the pivot; and a stop mechanism that stops the support arm The established location. A double-sided surface grinder as claimed in any one of claims 2 to 7, wherein the hydrostatic carrier guide is variable in a more fixed state and floats around a floating axis substantially parallel to the center of rotation of the carrier ring. Floating state. The double-sided surface grinder according to any one of claims 2 to 8, further comprising three or more of the static-pressure carrier guides arranged substantially equally on the outer circumference of the carrier ring, and having a gap An adjustment mechanism that adjusts a position of at least one of the three or more static pressure carrier guides in the substantially diametrical direction of the carrier ring to adjust the three or more static positions a gap between the static pressure surface of the ball carrier guide and the outer circumferential surface of the carrier ring.