JP2004283974A - Feeding device using linear motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To lighten a moving body without increasing deforming possibility and to facilitate the attachment/detachment of a member of a linear motor, in a feeding device using the linear motor. <P>SOLUTION: In this feeding device, the moving body 12 is reciprocatably guided and supported by a pair of guide rails 11 disposed in a base 10, one of a primary-side member 31 and a secondary-side member 32 of the linear motor 30 for moving the moving body with respect to the base is disposed in the moving body, and the other is disposed in the base. The opposite side of the the moving body to the base is provided with a pair of support rails 12a projecting mutually inwardly in parallel with the guide rails 11, and a mounting plate 33 for mounting the other member of the linear motor is mounted by abutting both outer edges 33a on the back surface of each support rail opposite to the base. The outer edge of the mounting plate is mounted to each support rail using a mounting bolt 44 inserted from an insertion hole 12b that reaches the outer surface of the moving body from the inner surface facing the back surface of each support rail. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a feeder using a linear motor suitable for moving a moving body of a machine tool.
[0002]
[Prior art]
As a feeder using this type of linear motor, a table (moving body) is guided and supported by a pair of guide rails provided on a base plate (base) so as to reciprocate, and a coil slider (coil) provided on the table is provided. There is an apparatus in which a table is moved by a linear motor composed of a magnetic plate (magnet) provided on a base plate (see, for example, Patent Document 1). FIG. 5 shows a more specific example of a feeder using such a linear motor. The moving body 3 is placed above the base 1 via a guide block 4 fixed to the lower side. Are guided and supported by a pair of guide rails 2 fixed parallel to each other at a distance W, and coils 5a of the linear motor 5 are arranged in a plurality of rows (3 in the illustrated example) on the lower surface of the moving body 3 between the guide rails 2. In the row, the distance between the outer row and the guide rail 2 is fixed by a tightening bolt 6 of W2), and the magnet 5b of the linear motor 5 opposed to the coil 5a with a certain gap is formed by a plurality of tightening bolts. 7 is fixed to the upper surface of the base 1. Such a mounting structure is known, but no literature describing this is found.
[0003]
[Patent Document 1]
JP-A-11-187640 (paragraphs [0008] to [0010], FIG. 1).
[0004]
[Problems to be solved by the invention]
In such a linear motor 5, a considerably large attractive force F (for example, several hundred to several thousand kgf) acts between the coil 5a and the magnet 5b. Therefore, three rows of tightening bolts 6 are used to mount the coil 5a. In the example of FIG. 5, the bending moment (the maximum value is M2) acting on the moving body 3 at the center in the width direction as shown by the solid line B in FIG. 6 acts. The moving body 3 needs to have sufficiently high rigidity so that the deformation due to the bending moment is kept within a limit that does not hinder its function. However, if the rigidity of the moving body 3 is to be increased, the weight of the moving body 3 will be increased. Therefore, there is a problem in that the acceleration performance, which is the original characteristic of the feeder using the linear motor, is reduced.
[0005]
When the moving body 3 is mounted on the base 1 when the coil 5a of the linear motor 5 is replaced, if the tightening bolt 6 is removed, the coil 5a is attracted and adhered to the magnet 5b by the magnetic force, so that it is extremely difficult to attach and detach the coil. However, if the moving body 3 is removed from the base 1 and the coil 5a is replaced in order to avoid this, there is a problem that labor is increased. Further, a standardized standard product including a mounting screw is usually used for the coil 5a, and there is no flexibility in the arrangement of the tightening bolts 6 provided on the moving body 3; It often overlaps. In such a case, the fastening bolt 6 for replacing the coil 5a cannot be attached or detached unless the part is removed, so that there is a problem that the labor for replacing the coil 5a is further increased.
[0006]
SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-described problems by attaching a member of a linear motor to a moving body via a mounting plate, which is a separate member, and devising a mounting structure of the mounting plate to the moving body. .
[0007]
[Means for Solving the Problems]
For this purpose, a feeder using a linear motor according to the present invention includes a base, a pair of guide rails provided in parallel with the base, and a moving body guided and supported by the guide rails so as to reciprocate. And a linear motor provided between the pair of guide rails and relatively moving the base and the moving body. The linear motor includes a primary side member provided on one of the base and the moving body. In a feeder using a linear motor comprising a base and a secondary member provided on the other side of the movable body facing the primary member, the guide rails are parallel to the side of the movable body facing the base. A pair of support rails which are arranged to face each other with a space therebetween and project inward from each other, and both outer edges are in contact with the back surface opposite to the base of each support rail. With a retained mounting plate, Member attached to the moving body of the two members of the linear motors is characterized in that attached to the mounting plate.
[0008]
Each support rail of the feeder using the linear motor described in the preceding paragraph may be arranged close to each guide rail when viewed from the direction of the magnetic attraction force generated between the two members of the linear motor. preferable.
[0009]
In the feeder using the linear motor described in the preceding item 2, the moving body has an insertion hole extending from the inner surface facing the back surface of each support rail to the outer surface opposite to the base, and the mounting plate has Each outer edge is preferably attached to each support rail by a mounting bolt inserted from an insertion hole.
[0010]
In the feeder using the linear motor described in each of the preceding items, a large T-shaped groove having a large width extending in parallel with the guide rail is formed between both guide rails on the side of the moving body facing the base, and the support rail is It is preferably formed by the lower side of a T-shaped bar.
[0011]
In the feeder using the linear motor described in each of the preceding items, it is preferable to attach a primary member of the linear motor composed of a coil to the mounting plate and attach a secondary member of the linear motor composed of the magnet to the base. .
[0012]
Function and Effect of the Invention
According to the feeder using the linear motor of the present invention, the suction force acting between the primary member and the secondary member of the linear motor is applied to both support rails of the moving body from both outer edges of the mounting plate. The value of the bending moment acting on the central portion of the moving body that is inside the two support rails arranged at a distance is constant. Since the value of this constant bending moment is smaller than the maximum value of the bending moment generated at the center in the width direction as in the prior art described with reference to FIGS. 5 and 6, the bending moment applied to the moving body as a whole is also as described above. It becomes smaller than in the case of the prior art. Therefore, the rigidity required to keep the deformation of the moving body due to the applied bending moment within a limit that does not impair the function thereof is smaller than that of the prior art, thereby reducing the weight of the moving body. Therefore, the acceleration performance, which is the original characteristic of the feeder using the linear motor, can be enhanced. Further, when the primary side member or the secondary side member of the linear motor attached to the moving body is replaced, even if the holding of each outer edge of the mounting plate with respect to each support rail is released, each outer edge of each support rail is released. Since the linear motor is supported in contact with the back surface, one member of the linear motor mounted on the mounting plate is not attracted to and adhered to the other member mounted on the base. Therefore, by pulling out the mounting plate in the longitudinal direction along the support rail, the mounting plate and one member of the linear motor attached thereto can be easily removed from the moving body, and the mounting plate and the linear motor can be easily removed in the reverse order. One member of the linear motor attached thereto can be easily attached to the moving body.
[0013]
According to the feeder using the linear motor according to claim 2, by bringing each support rail close to each guide rail, a constant bending moment acting on the central portion of the moving body inside the both support rails. Becomes smaller. Therefore, the bending moment applied to the moving body becomes smaller as a whole, so that the rigidity of the moving body becomes smaller, so that the weight of the moving body is further reduced and the original of the feeder using the linear motor is reduced. Acceleration performance, which is a characteristic, can be further enhanced.
[0014]
According to the feeder using the linear motor according to the third aspect, each outer edge of the mounting plate is attached to each support rail of the moving body through the insertion hole from the outer surface side opposite to the base. Since the mounting can be performed using the mounting bolts, the mounting of the mounting plate to the moving body becomes extremely easy. Since the positions of the insertion holes and the mounting bolts can be freely selected in the longitudinal direction of each outer edge, by selecting this position so as not to overlap with the mounting position of the component provided on the moving body, The members of the linear motor to be attached to the moving body can be attached and detached without removing such components, thereby reducing the time and effort for replacing the members of the linear motor.
[0015]
According to the feeder using the linear motor according to the fourth aspect, the support rail for holding the outer edges of the mounting plate for mounting one member of the linear motor in contact with the back surface opposite to the base is simplified. Can be formed.
[0016]
6. The linear motor according to claim 5, wherein a primary motor made of a coil having a more complicated structure has a greater chance of replacement in a linear motor having a coil as a primary member and a magnet as a secondary member. According to the feeder using the linear motor, the exchange of such a coil is facilitated, so that the structure becomes very suitable as a feeder using a linear motor.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a feeder using a linear motor according to the present invention will be described with reference to the embodiment shown in FIGS. In this embodiment, the present invention is applied to a grinding device that moves a grinding wheel table 15 provided with a grinding wheel 21 with respect to a bed 10 in an X direction and a Y direction. A saddle (X-axis moving body) 12 supported reciprocally in the X direction, a grindstone table (Y-axis moving body) 15 supported reciprocally in the Y direction on the saddle 12, and a saddle 12 The main components are an X-axis linear motor 30 that reciprocates with respect to the bed 10 and a Y-axis linear motor 40 that reciprocates the grindstone table 15 with respect to the saddle 12. The bed 10 plays a role of a base for the saddle 12, and the saddle 12 plays a role of the base for the grinding wheel stand 15. The coils (primary members) 31 and 41 of the X-axis and Y-axis linear motors 30 and 40 are attached to the saddle 12 and the grindstone base 15 via attachment plates 33 and 43, respectively.
[0018]
As shown mainly in FIGS. 1 and 2, a pair of guide rails 11 are fixed on the bed 10 in parallel with each other at a distance W along the X direction, and the saddle 12 is fixed on the lower side thereof. It is guided and supported by a guide rail 11 via four guide blocks 13. A pair of guide rails 14 are fixed on the saddle 12 in the Y direction in parallel with each other, and the grindstone table 15 is moved by the guide rails 14 via four guide blocks 16 fixed to the lower side. Guided and supported. A support head 20 is provided on the grindstone table 15 for supporting a grindstone shaft 20a having a grindstone wheel 21 attached at one end to one side in the Y direction and parallel to the X direction, and a central part parallel to the grindstone shaft 20a. A motor 23 having a suitable output shaft 23a is provided. The grinding wheel 21 includes a driving pulley 24 fixed to the tip of an output shaft 23a of a motor 23, a driven pulley 22 fixed to the other end of the grinding wheel shaft 20a, and a transmission wound around the pulleys 22 and 24. It is rotationally driven by a motor 23 via a belt 25.
[0019]
Next, the mounting structure of the X-axis linear motor 30 for reciprocating the saddle 12 with respect to the bed 10 will be described. As shown in FIGS. 1 to 3, a T-shaped groove having a low height and a large width is formed along the X direction on a side of the saddle 12 facing the bed 10. The portions form a pair of support rails 12a that are arranged in parallel with the guide rail 11 and face each other and project inward from each other. The back surface (upper surface) of each support rail 12a opposite to the bed 10 faces the inner surface (lower surface) of the T-shaped groove of the saddle 12, and the saddle 12 has the support rail 12a near both ends in the X direction. Eight insertion holes 12b are formed from the inner surface facing the back surface to the upper surface opposite to the bed 10. Each insertion hole 12 b is provided at a position that does not overlap with each guide rail 14 fixed on the saddle 12.
[0020]
As shown in FIGS. 1 to 3, the mounting plate 33 of the coil 31, which is the primary member of the X-axis linear motor 30, has a T-shaped cross section having a low height and a large width, which corresponds to the above-described T-shaped groove. Outer edges 33a of a constant width protruding outward and corresponding to T-shaped horizontal bars are formed in the upper half portions of both side portions. The mounting plate 33 is inserted into the T-shaped groove from the end surface in the X direction of the saddle 12, and each outer edge 33a is abutted on the back surface (upper surface) of which the lower surface is opposite to the bed 10 of each support rail 12a. And is screwed and fixed to each support rail 12a by eight mounting bolts 34 inserted from the respective insertion holes 12b. The distance between the center position in the width direction of one of the guide rails 11 and the center position in the width direction of the support rail 12a on the one side when viewed from the up and down direction is W1.
[0021]
The X-axis linear motor 30 includes a coil (primary member) 31 for generating a moving magnetic field and a magnet (secondary member) 32 for generating power by interaction with the magnetic field. The coils 31 are arranged in three rows. The magnet 32, which is fixed to the lower surface of the mounting plate 33 by a plurality of tightening bolts 35 arranged and is opposed to the coil 31 with a slight gap, is mounted on the upper surface of the bed 10 by a plurality of tightening bolts 36 arranged in three rows. Fixed. The direction of the magnetic attraction generated between the coil 31 and the magnet 32 of the X-axis linear motor 30 is the vertical direction in the figure.
[0022]
The mounting structure of the Y-axis linear motor 40 for reciprocating the grindstone table 15 with respect to the saddle 12 is substantially the same as the mounting structure of the X-axis linear motor 30, and will be briefly described. Mainly, as shown in FIG. 1, a T-shaped groove having a low height and a large width is formed along the Y direction on the side of the grindstone base 15 facing the saddle 12, thereby inwardly facing each other in parallel with the guide rail 14. A pair of support rails 15a protruding from are formed. A plurality of insertion holes 15b reaching the upper surface are formed in the grindstone table 15 from the gaps above the respective support rails 15a, and their positions are selected so as not to overlap with the support head 20 and the motor 23 provided on the grindstone table 15. ing.
[0023]
As shown in FIG. 1, the mounting plate 43 of the coil 41 of the Y-axis linear motor 40 has a T-shaped cross-sectional shape in which outer edges 43 a are formed in upper halves of both sides. Each outer edge 43a is supported by being contacted with the back surface of each support rail 15a, and is screwed and fixed by a mounting bolt 44 inserted from each insertion hole 15b. The coil 41 of the Y-axis linear motor 40 is fixed to the lower surface of the mounting plate 43 by tightening bolts 45, and the magnet 42 is fixed to the saddle 12 by tightening bolts 46.
[0024]
In the grinding device of this embodiment, the saddle 12 is moved in the X direction with respect to the bed 10 by the X-axis linear motor 30, and the grindstone table 15 is moved in the Y direction with respect to the saddle 12 by the Y-axis linear motor 40. The workpiece is processed by the car 21.
[0025]
In this operation, the magnetic attraction F acting between the coil 31 of the X-axis linear motor 30 and the magnet 32 only acts on both the support rails 12a of the saddle 12 from both outer edges 33a of the mounting plate 33. , The bending moment applied to the saddle 12 has a constant value M1 inside the two support rails 12a as shown by the solid line A in FIG.
[0026]
Next, in the X-direction feeder according to the embodiment of the present invention described above with reference to FIGS. 1 to 3 and the prior art shown in FIG. 5, the distance W between each guide rail and the linear motor coil and magnet When the value of the suction force F is the same, the bending moment applied to each of the moving bodies 12 and 3 is compared. If the bending moment of the prior art shown in FIG. 6 is entered in the bending moment diagram of this embodiment shown in FIG. As is clear from FIG. 4, the bending moment applied to the moving bodies 12 and 3 of the above-described embodiment and the prior art is the same in the range from the guide rails 11 and 12 to the inside of the distance W1 although the bending moment is the same. In a range inner than that, the bending moment applied to the moving body 12 of the above-described embodiment is a constant value M1, whereas the bending moment applied to the moving body 3 of the related art is directed toward the center in the width direction. And at the center there is a maximum value M2 which is much larger than M1. That is, the bending moment applied to the moving body 12 of the embodiment shown in FIGS. 1 to 3 is considerably smaller as a whole as compared with the bending moment applied to the moving body 3 of the prior art shown in FIG. The rigidity required to keep the deformation of the moving body 12 due to the moment within a limit that does not hinder its function is small in the above-described embodiment as compared with the above-described conventional technology. Therefore, the weight of the saddle 12 in this embodiment can be made smaller than that of the moving body 3 in the related art, and the acceleration performance, which is the original characteristic of a feeder using a linear motor, can be improved.
[0027]
Further, in the above-described embodiment, when the coil 31 of the linear motor 30 attached to the moving body 12 is replaced, even if the attachment bolt 34 is removed, each outer edge 33a of the attachment plate 33 remains on the back surface of each support rail 12a. The coil 31 attached to the attachment plate 33 is not attracted to and adhered to the magnet 32 attached to the bed 10 because the coil 31 attached to and supported by the (upper surface). Therefore, the coil 31 can be easily removed from the saddle 12 together with the mounting plate 33 by pulling out the mounting plate 33 to which the coil 31 is mounted in the longitudinal direction along the support rail 12a. Further, the coil 31 can be easily attached to the saddle 12 together with the attachment plate 33 in the reverse order.
[0028]
Furthermore, in the above-described embodiment, the positions of the mounting bolts 34 and the insertion holes 12b for inserting the mounting bolts 34 in the longitudinal direction of each outer edge 33a of the mounting plate 33 with respect to each support rail 12a can be freely selected. By preventing this position from overlapping with the mounting position of a component such as the guide rail 14 provided on the movable body 12, the coil 31 can be attached and detached together with the mounting plate 33 without removing such a component. Thereby, the trouble of replacing the coil 31 of the linear motor 30 can be reduced. If the position of the mounting bolt 34 and the insertion hole 12b for inserting the same overlap with a movable component such as the grindstone table 15 or the guide block 16, such a component is attached to the mounting bolt 34 and the mounting bolt 34. The coil 31 may be attached and detached together with the mounting plate 33 by moving to a position not overlapping the insertion hole 12b for insertion.
[0029]
When viewed from above and below, the distance W1 between the center position in the width direction of one guide rail 11 and the center position in the width direction of the support rail 12a on the one side is made as small as possible so that each support rail 12a is It is preferable to approach the guide rail 11, so that the bending moment applied to the saddle 12 is further reduced, so that the rigidity of the moving body 12 becomes smaller, thereby reducing the weight of the moving body 12. By making it smaller, the acceleration performance, which is the original characteristic of the feeder using the linear motor, can be further enhanced.
[0030]
In the embodiment described above, each outer edge 33a of the mounting plate 33 is attached to each support rail 12a of the saddle 12 by the mounting bolt 34 inserted from the upper surface side of the saddle 12 through the insertion hole 12b. Then, the attachment plate 33 can be attached to the saddle 12 very easily. However, the present invention is not limited to this, and the mounting of each outer edge 33a of the mounting plate 33 to each support rail 12a can be performed by another means. The effect can be achieved.
[0031]
Further, in the above-described embodiment, the coil 31 of the linear motor 30 is mounted on the saddle 12 via the mounting plate 33, and the magnet 32 is directly mounted on the bed 10. In this case, the structure is more complicated and there is an opportunity for replacement. This makes it easy to replace the coil 31 with a large number of coils, so that the structure is very suitable as a feeder using this type of linear motor. However, the present invention is not limited to this, and it is also possible to attach the magnet to the saddle 12 via the attachment plate 33 and attach the coil directly to the bed 10, and even in such a case, the above is described. The main effects can be achieved.
[0032]
Although the case where the saddle 12 is moved with respect to the bed 10 by the X-axis linear motor 30 has been described above, the case where the grindstone table 15 is moved with respect to the saddle 12 by the Y-axis linear motor 40 is substantially the same.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing the overall structure of an embodiment of a feeder using a linear motor according to the present invention.
FIG. 2 is a sectional view taken along line 2-2 of FIG.
FIG. 3 is a partially enlarged cross-sectional view illustrating a mounting structure of a mounting plate to the moving body in FIG. 2;
FIG. 4 is a view showing a bending moment applied to the moving body of the embodiment shown in FIG. 1;
FIG. 5 is a cross-sectional view showing an example of a feeder using a linear motor according to the related art.
6 is a diagram showing a bending moment applied to the moving body of the prior art shown in FIG.
[Explanation of symbols]
10, 12: Base (bed, saddle), 11, 14: Guide rail, 12, 15: Moving body (saddle, grindstone), 12a, 15a: Support rail, 12b, 15b insertion hole, 30, 40: Linear Motors (X-axis linear motor, Y-axis linear motor), 31, 41: Primary member (coil), 32, 42: Secondary member (magnet), 33, 43: Mounting plate, 33a, 43a: Outer edge, 34, 44 ... mounting bolts.

Claims (5)

A base, a pair of guide rails provided on the base in parallel with each other, a moving body guided and supported by the guide rails so as to be able to reciprocate, and the base provided between the pair of guide rails; A linear motor for relatively moving the table and the moving body, wherein the linear motor is provided on one of the base and the moving body, and the base is provided facing the primary member. And a feeder using a linear motor consisting of a secondary member provided on the other side of the moving body, facing the base of the moving body opposite to the base and facing each other in parallel with the guide rails. A pair of support rails arranged and formed to protrude inward from each other; and a mounting plate having both outer edges abutted and held on a back surface of each of the support rails opposite to the base. , 2 of the linear motor The member attached to the moving body of the member feeding apparatus using a linear motor, characterized in that attached to the mounting plate. 2. The feeder using a linear motor according to claim 1, wherein each of the support rails approaches each of the guide rails when viewed from a direction of a magnetic attraction force generated between two members of the linear motor. A feeder using a linear motor, wherein the feeder is arranged in a manner to be arranged. 3. The feeder using the linear motor according to claim 1, wherein the movable body is inserted from an inner surface of each of the support rails facing the back surface to an outer surface opposite to the base. 4. A feeder using a linear motor, wherein a hole is formed, and each outer edge of the mounting plate is mounted on each of the support rails by a mounting bolt inserted from the insertion hole. 4. The feeding device using the linear motor according to claim 1, wherein a width of the moving body extending parallel to the guide rail between the guide rails on a side facing the base. 5. A feed device using a linear motor, wherein a T-shaped groove having a large width is formed, and the support rail is formed by a lower side of the T-shaped horizontal bar. The feeder using the linear motor according to any one of claims 1 to 4, wherein a primary side member of the linear motor including a coil is mounted on the mounting plate, and a magnet is mounted on the base. A feeder using a linear motor, wherein a secondary member of the linear motor is mounted.

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