JP2005329522A - Double head surface grinding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a double head surface grinding machine highly accurately grinding a workpiece by suppressing a change of parallelism of a pair of rotating grinding tools. <P>SOLUTION: This grinding machine 10 includes a frame 12 for concentrically supporting a pair of grinding tool shaft units 16 connected to the pair of rotating grinding tools 14. The frame 12 is constituted of an integral structure including oppositely arranged front part 20 and back part 22, a pair of side parts 30 oppositely arranged between the front part 20 and the back part 22, and a pair of side parts 32 arranged between the front part 20 and the back part 22 to hold the pair of side parts 30. The side parts 30 and 32 are provided with through holes 34 and 37, respectively. In the state in which the pair of rotating grinding tools 14 are oppositely arranged between the pair of the side parts 30, and the pair of grinding tool shaft units 16 are inserted into the through hole 34 and the through hole 37, respective grinding tool shaft units 16 are concentrically supported by a ring-shaped member 124 mounted on the side part 30 and a ring-shaped member 126 mounted on the side part 32. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a double-head surface grinder, and more particularly to a double-head surface grinder that grinds both surfaces of a workpiece with a pair of rotating grindstones arranged in a horizontal direction and coaxially.

2. Description of the Related Art Conventionally, as a double-sided surface grinder that grinds both surfaces of a workpiece with a pair of opposed rotating grindstones, a horizontal double-headed surface grinder in which a pair of rotating grindstones are arranged opposite to each other in the horizontal direction is known.
In the horizontal double-sided surface grinder, for example, as in the double-sided surface grinder 1 shown in FIG. 12 (a), a pair of grindstone shaft units 3 are arranged coaxially on the bed 2 and fixed by bolts 3a. A rotating grindstone 4 is attached to each of the pair of grindstone shaft units 3. By driving the motor 5, the rotating grindstone 4 rotates via the belt 6 and the grindstone shaft unit 3.

  By inserting the workpiece W between the opposing grinding surfaces of the pair of rotating wheels 4 and rotating the pair of rotating wheels 4, both surfaces of the workpiece W are ground. During the grinding of the workpiece W, a grinding fluid (coolant) is supplied to the pair of rotating grindstones 4 and the workpiece W, and the supplied grinding fluid is a drain groove 2 a provided on the bed 2 below the pair of rotating grindstones 4. To be discharged.

  In such a double-sided surface grinder 1, the grinding resistance F1 received by the pair of rotating grindstones 4 during the grinding process acts to push open both the rotating grindstones 4 and the bed 2 via the grindstone shaft unit 3 and the bolt 3a. And a bending moment is applied to the bed 2. Then, due to the influence of the bending moment, as shown in FIG. 12 (b), the bed 2 is deformed, and accordingly, the parallelism of the pair of rotating grindstones 4 and the distance between the opposing grinding surfaces are changed. There was a problem that the processing accuracy to the remarkably decreased.

A technique for solving this type of problem is disclosed in Patent Document 1, for example.
In the double-sided surface grinding machine of Patent Document 1, a pair of storage chambers that respectively store a pair of grindstone shaft units and a grinding chamber that is provided between the pair of storage chambers and in which a pair of rotating grindstones are disposed are integrated by a plate-like member. The frame constructed as described above is used, and the entire structure is a box structure, so that the rigidity is increased and the deformation is suppressed.
JP 2003-19648 A

However, in the technique disclosed in Patent Document 1, rotatable universal joints are attached to the front wall and the rear wall facing each other of the frame, and the two universal joints support the grindstone shaft unit via the support frame. By doing so, the grindstone shaft unit is suspended in the frame.
In this technique, two universal joints receive grinding resistance transmitted from a rotating grindstone to a grindstone shaft unit during workpiece grinding. Since it is supported from the above, there is a possibility that the grinding resistance cannot be sufficiently resisted. In this case, the pair of grindstone shaft units cannot be stably held during workpiece grinding, and the parallelism of the pair of rotating grindstones and the interval between the facing grinding surfaces change, which may reduce the workpiece machining accuracy.
Therefore, a main object of the present invention is to provide a double-head surface grinder capable of suppressing a change in parallelism of a pair of rotating grindstones and grinding a workpiece with high accuracy.

  In order to achieve the above-mentioned object, the double-sided surface grinder according to claim 1 is a double-headed surface grinder that grinds both surfaces of a workpiece by a pair of rotating grindstones arranged opposite to each other on the same axis in the horizontal direction, A pair of grinding wheel shaft units connected to a pair of rotary grinding wheels, a frame for supporting the pair of grinding wheel shaft units concentrically, a first ring member for supporting each grinding wheel shaft unit concentrically, and each grinding wheel shaft unit The frame is provided with a second ring-shaped member that concentrically supports the frame, and the frame is disposed so as to be opposed to each other between the front portion and the back portion, and between the front portion and the back portion, and is connected to the front portion and the back portion. An integrated structure including a pair of first side parts and a pair of second side parts arranged between the front part and the back part so as to sandwich the pair of first side parts and connected to the front part and the back part together It is composed of a pair of grinding wheel shaft units. The first through holes are provided in the pair of first side portions and the second through holes are provided in the pair of second side portions, respectively, so that the pair of rotating grindstones are opposed to each other between the pair of first side portions. Each wheel unit is supported concentrically by a first ring-shaped member attached to the first side portion in a state where the wheel unit is disposed and the pair of wheel shaft units are inserted through the first and second through holes. It is characterized by being concentrically supported by a second ring member attached to the second side.

  A double-head surface grinder according to claim 2 is characterized in that, in the double-head surface grinder according to claim 1, the frame is integrally formed including a bed provided on the lower side thereof.

  The double-sided surface grinder according to claim 3 is the double-sided surface grinder according to claim 1 or 2, wherein a grinding chamber for grinding a workpiece is formed between the pair of first side portions, and the bottom surface of the grinding chamber Is formed in a polygonal shape or a curved shape.

  The double-sided surface grinder according to claim 4 is the double-sided surface grinder according to claim 3, wherein the bottom surface of the grinding chamber is configured to be concave.

  The double-head surface grinder according to claim 5 is the double-head surface grinder according to any one of claims 1 to 4, wherein the first ring-shaped member is provided inside the first side portion, and the second ring-shaped member is provided. Is provided on the outer side of the second side and is configured to support the grinding wheel shaft unit in the axial direction and concentrically, and is supported by the first ring-shaped member of the grinding wheel shaft unit so that the grinding wheel shaft unit can be tilted. The surfaces to be formed are formed in a spherical shape, and the surfaces where the grindstone shaft unit and the second ring-shaped member are in contact with each other are formed in a spherical shape.

  The double-sided surface grinder according to claim 6 is the double-sided surface grinder according to any one of claims 1 to 5, wherein the frame is a casting.

  In the double-head surface grinder according to claim 1, the first ring shape that supports the grinding wheel shaft unit concentrically (annularly) for grinding resistance applied to each rotating wheel during grinding and transmitted to each grinding wheel shaft unit. It is received by the member and the second ring-shaped member, and is transmitted to the integrally structured frame via the first ring-shaped member and the second ring-shaped member. In this way, the grinding resistance transmitted to each grindstone shaft unit is received from the circumferential direction at a plurality of locations of the grindstone shaft unit by the first ring-shaped member and the second ring-shaped member, thereby suppressing the positional deviation of the grindstone shaft unit. , Grinding resistance is transmitted to the highly rigid frame with a single structure and dispersed and absorbed. Accordingly, the pair of grindstone shaft units can be stably held during grinding, the change in the parallelism of the pair of rotating grindstones can be suppressed, and the workpiece can be ground with high accuracy. In addition, by using an integral frame, the assembly process of the double-sided surface grinder can be reduced, and the assembly cost can be reduced.

  In the double-head surface grinding machine according to claim 2, by integrally forming the frame including the bed, the rigidity of the frame can be further increased, and the pair of grindstone shaft units can be held more stably during the grinding process. it can. Further, by integrally forming the frame including the bed, it is possible to further reduce the assembling process of the double-head surface grinder and thereby reduce the assembling cost.

  In the double-head surface grinder according to claim 3, the rigidity of the frame can be further increased by forming the bottom surface of the grinding chamber into a polygonal surface or a curved surface, and the pair of the pair of grinders can be stably stabilized. The wheel unit can be held.

  Generally, in order to remove grinding (friction) heat generated in the rotating grindstone and the workpiece and stably grind the workpiece, a grinding fluid is supplied to the pair of rotating grindstone and the workpiece during the grinding. Since the grinding fluid whose temperature has been raised by grinding heat flows into the drainage groove, the strength of the structure near the drainage groove decreases, and as a result, the structure is deformed and the parallelism of the pair of rotating whetstones changes. May get worse. In the double-head surface grinding machine according to claim 4, the bottom surface formed in a polygonal shape or a curved surface of the grinding chamber is formed in a concave shape, and the bottom surface is also used as a drainage groove, whereby the rigidity of the structure near the drainage groove is increased. Can be raised. Therefore, deformation of the structure due to grinding heat can be prevented, and high grinding accuracy can be ensured.

  Some double-sided surface grinders, for example, are configured to carry in a workpiece from above a pair of rotating grindstones and carry it out from below. In this case, in order to perform grinding efficiently, the parallelism of the pair of rotating grindstones is adjusted, and the distance between the facing grinding surfaces at the position where the workpiece is unloaded is larger than the distance between the facing grinding surfaces at the position where the workpiece is loaded. It is desirable to narrow the width by the grinding amount. However, in this case, it is difficult to stably maintain the parallelism of the arbitrarily adjusted pair of rotating grindstones. In the double-head surface grinding machine according to claim 5, even when the parallelism of the pair of rotary grinding wheels is adjusted by tilting the grinding wheel shaft unit, the grinding resistance transmitted to the grinding wheel shaft unit is reduced between the grinding wheel shaft unit and the surface. By receiving in the axial direction (substantially the same direction as the grinding resistance) and concentric (annular) by the second ring-shaped member in contact with each other, it is possible to suppress the positional deviation of the grindstone shaft unit, and a pair of grindstones during grinding The shaft unit can be held stably.

  Generally, by casting, a product having a complicated shape such as a hollow shape can be easily produced as compared with a welded structure. In the double-sided surface grinder according to the sixth aspect, the frame can be easily manufactured by obtaining the frame by casting, and the manufacturing cost of the frame and hence the cost of the double-sided surface grinder can be suppressed.

  According to this invention, the change in the parallelism of the pair of rotating grindstones can be suppressed, and the workpiece can be ground with high accuracy.

Embodiments of the present invention will be described below with reference to the drawings.
1 to 4, a horizontal double-sided surface grinder (hereinafter simply referred to as double-sided surface grinder) 10 according to an embodiment of the present invention includes a frame 12, a pair of rotating grindstones 14, and a pair of rotating grindstones 14. And a pair of grindstone shaft units 16 to be attached.
The frame 12 is an integrally structured casting manufactured using, for example, meehanite cast iron or murine cast iron, and a plurality of spaces are defined in the interior.

  Referring to FIGS. 5 to 8, the frame 12 includes a plate-like base 18, and a plate-like front portion 20 and a back portion 22 that are arranged opposite to each other in parallel with each other on the base 18. The A partition portion 24 for partitioning the inside of the frame 12 up and down is provided in the horizontal direction and connected to the front portion 20 and the back portion 22. The space formed by the front part 20, the back part 22, the base 18, and the partition part 24 is partitioned into a plurality of rooms 26 (here, four on the front side and four on the rear side), and is separated from the partition part 24. The portion substantially functions as the bed 28. That is, the bed 28 is integrally formed at the lower part of the frame 12.

  A pair of plate-like side portions 30 are formed between the front portion 20 and the back portion 22 and above the partition portion 24. The pair of side portions 30 are arranged opposite to each other in parallel and provided in a direction orthogonal to the front portion 20, and are both connected to the front portion 20 and the back portion 22. In addition, a pair of side portions 32 is formed between the front portion 20 and the back portion 22 and above the partition portion 24 so as to sandwich the pair of side portions 30. The pair of side portions 32 are provided so as to be orthogonal to the front portion 20, and are both connected to the front portion 20 and the back portion 22. Further, through holes 34 having a circular cross section are provided in the pair of side portions 30 so that the pair of grindstone shaft units 16 can be inserted, and through holes having a circular cross section each having an annular step portion 36 in the pair of side portions 32. 37 is provided. The two through holes 34 and the two through holes 37 are formed in the direction of arrow A and coaxially.

  On the upper side of the partition portion 24, a grinding chamber 38 in which the pair of rotating grindstones 14 is disposed between the pair of side portions 30 is formed, and two storage chambers that respectively store the grindstone shaft units 16 on the outside of the pair of side portions 30. 40 is formed.

  The side portion 32 is formed with a bolt hole 42 extending from the outer end surface in the arrow A direction and a bolt hole 44 penetrating from the outer peripheral surface to the through hole 37. Four bolt holes 42 and 44 are formed at equal angular intervals, respectively (see FIG. 4).

  Further, an opening 46 is formed in a portion corresponding to the grinding chamber 38 in the front portion 20. An opening 48 is formed in a portion corresponding to the grinding chamber 38 in the back portion 22, and a through hole 50 is formed in a portion corresponding to the storage chamber 40.

  Further, an opening 52 is formed in the ceiling of the grinding chamber 38, and the bottom surface 54 (the upper surface of the central portion of the partition portion 24) of the grinding chamber 38 is formed in a concave and polygonal shape. Further, the bottom surface 54 is formed so as to be inclined from the front portion 20 to the back portion 22 in a side view (see FIG. 8), and is drained from a drain hole 56 penetrating the back portion 22. The upper part of the accommodating part 40 is open.

  In this way, the frame 12 is integrally formed in a box shape by a plate-like member, and the bottom surface 54 of the grinding chamber 38 where the grinding fluid flows and is most affected by the grinding heat is not simply flat but polygonal, By providing the plurality of chambers 26, the rigidity of the frame 12 is greatly increased against the bending stress of compression and tension. Further, by forming through holes 34 and 37 having a circular cross section in the frame 12 and making the frame 12 a combination structure of a box shape and a circular through hole, the bending rigidity can be increased. The number and shape of the plurality of rooms 26 partitioned in the bed 28 are not limited, and the rigidity of the bed 28 and thus the frame 12 can be further increased by increasing the number of rooms.

Next, the grindstone shaft unit 16 will be described.
Referring to FIG. 9, the grindstone shaft unit 16 includes a substantially cylindrical grindstone shaft case 58, a substantially cylindrical quill sleeve 60 inserted into the grindstone shaft case 58, and a grindstone shaft 62 that passes through the quill sleeve 60. including.

On the outer peripheral surface of one end of the grindstone shaft case 58, a spherical annular spherical surface portion 64 having a position O as the center of the sphere is provided. Here, the position O is an intersection of the axis of the grindstone shaft case 58 and a plane passing through the ridge line of the annular spherical surface portion 64. A cap 66 is fixed to the other end of the grindstone shaft case 58.
A spline sleeve 72 is rotatably inserted into the cap 66 through bearings 68 and 70, and a pulley 74 is fixed to the end of the spline sleeve 72.

  On the outer peripheral surface of the grindstone shaft case 58, an annular flange 76 and an opening 78 reaching the inside of the grindstone shaft case 58 are provided. The annular flange 76 is formed with a spherical annular sliding surface 80 and an annular step 82 with the position O as the center of the sphere. A worm shaft 86 having a gear 84 formed on the outer peripheral surface is disposed in the opening 78 in a direction orthogonal to the axial direction, and a cover 88 is attached to the outer surface of the grindstone shaft case 58 so as to cover the opening 78. .

Bearings 90 and 92 are attached to the inside of the grindstone shaft case 58 at positions corresponding to the openings 78. A worm wheel 94 is rotatably disposed between the bearings 90 and 92.
A gear 96 that meshes with the gear 84 of the worm shaft 86 disposed in the opening 78 is formed on the outer peripheral surface of the worm wheel 94. A screw thread (not shown) is formed on the inner peripheral surface of the worm wheel 94. The worm wheel 94 rotates with the rotation of the worm shaft 86 while the movement in the arrow A direction is restricted by the bearings 90 and 92.

  A quill sleeve 60 is inserted into the grinding wheel shaft case 58 through metal sleeves 98 and 100 so as to be movable in the A direction. A screw portion 102 is provided on the outer peripheral surface of the quill sleeve 60, and the screw thread on the inner peripheral surface of the worm wheel 94 and the screw portion 102 of the quill sleeve 60 are screwed together in the grindstone shaft case 58.

  A ring-shaped piston 104 is attached to an end portion of the quill sleeve 60 located in the grindstone shaft case 58. A cylindrical cylinder chamber 106 is formed inside the grindstone shaft case 58 by the piston 104. The grindstone shaft case 58 is provided with an air hole 108 that communicates from the outer peripheral surface to the cylinder chamber 106.

  A grindstone shaft 62 is inserted into the quill sleeve 60 through bearings 110, 112 and 114. An attachment portion 116 for attaching the rotating grindstone 14 is provided at one end portion of the grindstone shaft 62, and a spline groove 118 that meshes with the inner peripheral surface of the spline sleeve 72 is formed at the other end portion. The grindstone shaft 62 is formed with a passage 120 penetrating the shaft center for circulating the grinding fluid. A grinding fluid supplied from a grinding fluid supply device (not shown) flows into the passage 120 via the universal joint 122 attached to the end of the grindstone shaft 62. The grinding fluid that has flowed into the passage 120 flows out from the end on the attachment portion 116 side, and is supplied to the rotating grindstone 14.

In such a grindstone shaft unit 16, the spline sleeve 72 and the grindstone shaft 62 rotate with the rotation of the pulley 74, whereby the rotating grindstone 14 rotates.
Further, in the grindstone shaft unit 16, the worm wheel 94 is rotated through the meshing of the gears 84 and 96 with the rotation of the worm shaft 86, and further, a screw thread and a screw portion formed on the inner peripheral surface of the worm wheel 94. The quill sleeve 60 moves through the threaded engagement with 102. As a result, the quill sleeve 60 and the grindstone shaft 62 move in the direction of arrow A, and as a result, the rotating grindstone 14 attached to the attachment portion 116 moves in the direction of arrow A.

  Thus, in order to move the rotating grindstone 14 in the direction of arrow A by the so-called quill method, the gear 84 of the worm shaft 86 and the gear 96 of the worm wheel 94 are formed to mesh with backlash (play). . The same applies to the screw thread formed on the inner peripheral surface of the worm wheel 94 and the screw portion 102 of the quill sleeve 60. However, by having the backlash, the accuracy of the moving distance of the rotating grindstone 14 is lowered. In the grindstone shaft unit 16 configured as described above, compressed air is supplied from the air hole 108 to the cylinder chamber 106 with a constant pressure by an air pump (not shown), and the quill sleeve 60 and the grindstone shaft 62 are pushed to the pulley 74 side. The accuracy of the moving distance of the rotating grindstone 14 is prevented from being lowered due to the backlash between the quill sleeve 60 and the screw portion 102.

Returning to FIG. 1, in the frame 12, the grindstone shaft unit 16 is inserted into the through holes 34 and 37 so that the rotating grindstone 14 faces the grinding chamber 38, and the grindstone shaft unit 16 is accommodated in the accommodation chamber 40.
A ring-shaped member 124 is attached to the inner side of the side portion 30 (end surface on the grinding chamber 38 side), and the annular spherical portion 64 of the grindstone shaft unit 16 is supported concentrically by the ring-shaped member 124.

  A ring-shaped member 126 is attached to the outer end surface of the side portion 32. The ring-shaped member 126 is formed with a spherical annular sliding surface 128 having the same curvature as the annular sliding surface 80 so as to come into surface contact with the annular sliding surface 80 of the grindstone shaft unit 16. By inserting a plurality of bolts 130 into the ring-shaped member 126 and screwing the bolts 130 into the bolt holes 42, the ring-shaped member 126 is in contact with the annular sliding surface 80 and the annular sliding surface 128. 32.

  A plurality of springs 132 are disposed between the annular step portion 82 of the grindstone shaft unit 16 and the annular step portion 36 of the side portion 32. The grindstone shaft unit 16 is ejected toward the ring-shaped member 126 in the direction of arrow A by a spring 132.

  An adjustment bolt 134 for adjusting the tilting of the grindstone shaft unit 16 is screwed into each bolt hole 44 of the side portion 32, and by pressing the annular flange 76 located in the through hole 37, the grindstone shaft unit 16. The tilt of the is adjusted.

  That is, by changing the projecting length of each adjusting bolt 134 in the through hole 37, the grindstone shaft unit 16 uses the contact portion between the annular spherical surface portion 64 and the ring-shaped member 124 as a fulcrum, and the annular sliding surface 80 has a ring shape. The grindstone shaft unit 16 tilts while sliding on the annular sliding surface 128 of the member 126. By this operation, the arrangement state of the grindstone shaft unit 16 can be adjusted, and the parallelism of the pair of rotating grindstones 14 and the distance between the pair of grinding surfaces 14a can be adjusted. Even if the adjustment bolt 134 is loosened, the grindstone shaft unit 16 is springed in the direction of arrow A by the spring 132, so that the inclination of the grindstone shaft unit 16 and thus the rotating grindstone 14 can be easily adjusted without slipping by its own weight.

  As described above, the grindstone shaft unit 16 having a substantially cylindrical shape is disposed at the center of the box-shaped frame 12 so that the grindstone shaft unit 16 is entirely wrapped by the side portions 30 and 32 and the gong-shaped members 124 and 126. By holding, a support structure for the grindstone shaft unit 16 having high stability and rigidity can be obtained.

2 and 4, a table 136 is attached to the front surface of the front portion 20 of the frame 12.
A carrier driving unit 138 is disposed on the table 136. A rotary carrier 140 is attached to the carrier driving unit 138 so as to enter the grinding chamber 38 from the opening 46.

Referring to FIG. 10, the rotary carrier 140 is provided with a plurality of (here, twelve) work pockets 142 penetrating the main surface in an annular shape at substantially equal angular intervals, and a work W is disposed in each work pocket 142. The
As the workpiece W which is a workpiece, for example, ceramics, high speed tool steel (SKH), alloy tool steel (SKS, SKD, SKT), high carbon-high chromium bearing steel (SUJ), or the like is used.

As shown in FIG. 3, two motors 144 are attached to the back portion 22. A pulley 146 is attached to the rotation shaft of each motor 144.
The pulley 146 is connected to the pulley 74 of the grindstone shaft unit 16 by a belt 148. By driving the motor 144 and rotating the pulley 146, the pulley 74 is rotated via the belt 148. As a result, the rotating grindstone 14 attached to the grindstone shaft 62 of the grindstone shaft unit 16 rotates.

  Two servo motors 150 are attached to the back portion 22. The rotation shaft of each servo motor 150 is inserted through a through hole 50 (see FIG. 5) provided in the back portion 22 and is connected to the worm shaft 86 of the grindstone shaft unit 16 through a coupling (not shown) in the accommodation chamber 40.

  Further, a dressing device 152 is disposed on the back portion 22 so as to fit into the opening 48 (see FIG. 5). The dressing device 152 includes a dress portion 154 that performs a plane correction (truing) and a cleaning sharpening process (dressing) on a pair of facing grinding surfaces 14 a of the pair of rotating grindstones 14, and an arm 156 that moves the dress portion 154.

  A cover 158 covering the opening 52 is attached to the ceiling of the grinding chamber 38 of the frame 12 so as to be openable and closable. Maintenance work for exchanging the rotating grindstone 14 in the grinding chamber 38 is performed from the opening 52 with the cover 158 opened.

  In such a double-headed surface grinder 10, each worm shaft 86 is rotated by driving each servo motor 150, and the pair of rotating grindstones 14 adjusted to a desired parallelism are moved in the direction of arrow A, respectively. Thus, the interval between the facing grinding surfaces 14a is adjusted so as to correspond to the width dimension of the workpiece W.

  Then, the rotary carrier 140 is rotated in the arrow R direction (see FIG. 4) by the carrier driving unit 138 while driving the motors 144 to rotate the pair of rotating grindstones 14. As a result, the workpieces W arranged in the workpiece pockets 142 are sequentially carried between a pair of opposing grinding surfaces 14 a in the grinding chamber 38, and grinding is performed on both end surfaces of the workpieces W. At the time of grinding, the grinding fluid is supplied to the pair of rotating grindstones 14 and the workpiece W through the passage 120 of each grindstone shaft 62.

  The processed workpiece W carried out of the grinding chamber 38 with the rotation of the rotary carrier 140 is discharged from the work pocket 140 by a discharge device (not shown). A product obtained by subjecting both end surfaces of the workpiece W to grinding is used for an inner ring of a bearing, for example.

  In addition, by rotating the pair of rotating grindstones 14 whose intervals are adjusted in accordance with the width dimension of the dressing portion 154, the dressing portion 154 is disposed between the pair of grinding surfaces 14a by the arm 156, whereby a pair of grinding surfaces 14a is subjected to truing and dressing.

  According to such a double-headed surface grinding machine 10, the ring-shaped member 124 that concentrically supports the grinding wheel shaft unit 16 is subjected to grinding resistance that is applied to each rotating grinding wheel 14 and transmitted to each grinding wheel shaft unit 16 during grinding. And 126, and is transmitted to the unitary frame 12 through the ring-shaped members 124 and 126. That is, the grinding resistance applied to the rotating grindstone 14 is transmitted from the grindstone shaft 62 to the quill sleeve 60 and the worm wheel 94, and further to the annular spherical surface portion 64 and the annular sliding surface 80 of the grindstone shaft case 58 via the bearings 90 and 92. Then, it is received by the ring-shaped members 124 and 126 and transmitted to the frame 12.

  In this way, the grinding resistance transmitted to the grindstone shaft 62 is transferred from the grindstone shaft 62 concentrically outwardly, and received by the ring-shaped members 124 and 126 from the circumferential direction at a plurality of locations of the grindstone shaft unit 16, While suppressing the displacement of the grinding wheel shaft unit 16, the grinding resistance is transmitted to the highly rigid frame 12 having a single structure and dispersed and absorbed. Accordingly, the pair of grindstone shaft units 16 can be stably held during grinding, the change in parallelism of the pair of rotating grindstones 14 can be suppressed, and the workpiece W can be ground with high accuracy. Moreover, by using the frame 12 having an integral structure, the assembly process of the double-sided surface grinding machine 10 can be reduced, and the assembly cost can be reduced.

  In particular, even when the grindstone shaft unit 16 is tilted to adjust the parallelism of the pair of rotating grindstones 14, the ring-shaped member 126 that makes contact with the grindstone shaft unit 16 on the surface thereof is applied to the grinding resistance transmitted to the grindstone shaft unit 16. By receiving in the axial direction (substantially the same direction as the grinding resistance) and concentrically, the displacement of the grinding wheel shaft unit 16 can be suppressed, and the pair of grinding wheel shaft units 16 can be stably held during grinding. .

  In addition, by integrally forming the frame 12 including the bed 28, the rigidity of the frame 12 can be further increased, and the pair of grindstone shaft units 16 can be more stably held during grinding. Further, by integrally forming the frame 12 including the bed 28, the assembly process of the double-head surface grinding machine 10 can be further reduced, and the assembly cost can be reduced.

  Furthermore, since the bottom surface 54 of the grinding chamber 38 is formed in a polygonal shape or a curved shape, the rigidity of the frame 12 can be further increased, and the pair of grinding wheel shaft units 16 can be held more stably during grinding. .

  Further, the bottom surface 54 of the grinding chamber 38 formed in a polygonal shape or a curved surface is formed in a concave shape, and the bottom surface 54 is also used as a drainage groove, whereby the rigidity of the structure near the drainage groove can be increased. Therefore, deformation of the structure due to grinding heat can be prevented, and high grinding accuracy can be ensured.

  Furthermore, by obtaining the frame 12 by casting, the frame 12 can be easily manufactured, and the manufacturing cost of the frame 12 and thus the cost of the double-sided surface grinder 10 can be suppressed.

  In the above-described embodiment, the case of using the so-called rotary carrier grinding method in which the rotary carrier 140 is rotated and the workpiece W is carried into the grinding chamber 38 has been described. However, the present invention can be applied to any grinding method. For example, a through-feed grinding method in which the workpiece W is linearly carried into the grinding chamber 38 may be employed as the grinding method.

  As shown in FIG. 11, the frame 200 and the bed 202 may be configured as separate members.

  Further, the shape of the bottom surface 54 may be any shape such as a U-shaped cross section or a V-shaped cross section as long as the rigidity of the frame 12 can be improved as compared with the case where the bottom surface 54 is formed in a flat shape.

It is DD (FIG. 4) sectional drawing which shows one Embodiment of this invention. It is a front view which shows one Embodiment of this invention. It is a rear view which shows one Embodiment of this invention. It is a side view which shows one Embodiment of this invention. It is sectional drawing which shows a flame | frame. It is a side view which shows a flame | frame. It is BB (FIG. 5) sectional drawing which shows a flame | frame. It is CC (FIG. 5) sectional drawing which shows a flame | frame. It is sectional drawing which shows a grindstone axis | shaft unit. It is an illustration figure which shows an example of a rotary carrier. It is sectional drawing which shows the other example of a flame | frame. It is an illustration figure which shows a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Double-head surface grinder 12,200 Frame 14 Rotating grindstone 16 Grinding wheel axis unit 20 Front part 22 Back part 28,202 Bed 30,32 Side part 34,37,50 Through hole 38 Grinding chamber 54 Grinding chamber 54 Grinding chamber bottom surface 64 Annular spherical surface 80 , 128 Annular sliding surface 124, 126 Ring-shaped member

Claims (6)

A double-head surface grinder that grinds both sides of a workpiece with a pair of rotating grindstones arranged opposite to each other on the same axis in the horizontal direction,
A pair of grinding wheel shaft units connected to the pair of rotating grinding wheels,
A frame for concentrically supporting the pair of grindstone shaft units;
A first ring-shaped member that supports each of the grindstone shaft units concentrically; and a second ring-shaped member that supports each of the grindstone shaft units concentrically,
The frame includes a front portion and a back portion that are disposed to face each other, a pair of first side portions that are disposed to face each other between the front portion and the back portion, and are connected to the front portion and the back portion. The first side portion is sandwiched between the front portion and the back portion, and is configured as an integral structure including a pair of second side portions that are connected to the front portion and the back portion.
A first through hole is provided in each of the pair of first side parts and a second through hole is provided in each of the pair of second side parts so that the pair of grindstone shaft units can be inserted;
In the state where the pair of rotating grindstones are arranged to face each other between the pair of first side portions and the pair of grindstone shaft units are inserted through the first through holes and the second through holes, A double-headed surface grinding machine supported concentrically by the first ring-shaped member attached to the first side and supported concentrically by the second ring-shaped member attached to the second side.   The double-head surface grinding machine according to claim 1, wherein the frame is integrally formed including a bed provided on an underside thereof.   The double-head surface grinding according to claim 1 or 2, wherein a grinding chamber for grinding the workpiece is formed between the pair of first side portions, and a bottom surface of the grinding chamber is formed in a polygonal shape or a curved shape. Board.   The double-head surface grinding machine according to claim 3, wherein the bottom surface of the grinding chamber is configured to be concave. The first ring-shaped member is provided inside the first side part,
The second ring-shaped member is provided outside the second side portion, and is configured to be able to support the grindstone shaft unit axially and concentrically,
A surface of the grindstone shaft unit that is supported by the first ring member is formed in a spherical shape so that the grindstone shaft unit can tilt, and the grindstone shaft unit and the second ring member are The double-sided surface grinding machine according to any one of claims 1 to 4, wherein the mutually contacting surfaces are formed in a spherical shape.   The double-head surface grinder according to any one of claims 1 to 5, wherein the frame is a casting.

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