JP2005111640A - Polishing machine and polishing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polishing machine and a polishing direction capable of stably exhibiting performance of this kind of brush-like grinding wheel by always keeping constant a workpiece notch mount of the brush-like grinding wheel using inorganic continuous fiber. <P>SOLUTION: A tool holding body 6 for holding the brush-like grinding wheel 10 is supported on a holder body 7 movably in the direction approaching the workpiece and in the direction separating from the workpiece. The tool holding body 6 for holding the brush-like grinding wheel 10 is energized by a helical compression spring 80 with a predetermined energizing force toward the workpiece, so that the notch mount in the workpiece can be kept constant even when a linear grinding material using the inorganic continuous fiber in the brush-like grinding wheel 10 wears. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a polishing machine and a polishing method for deburring and surface finishing.

  In precision parts used in automobiles and aircraft, stress cracking and malfunction of the device may occur due to burrs remaining after machining. Further, the machined part may be used as a reference position when the apparatus is set in the next process. Therefore, high precision deburring and surface finishing are required for precision parts.

  A brush-like grindstone using inorganic long fibers such as alumina long fibers is suitable for such high-precision deburring and surface finishing. This type of brush-like grindstone is a grindstone made up of a large number of linear abrasives made by impregnating and curing a binder resin on an aggregate yarn of alumina long fibers, and has a polishing power compared to nylon brushes and wire brushes containing abrasive powder. Strong (see, for example, Patent Document 1).

Therefore, it is possible to grind workpieces such as automobile parts and aircraft parts that require high-precision deburring and surface finishing. Moreover, because of the brush shape, the compatibility between the grindstone and the workpiece is high, and fine deburring and surface finishing can be performed. Moreover, according to this type of brush-like grindstone, the deburring process can be automated.
JP 2003-136413 A

  However, since the brush-like grindstone using the inorganic long fiber is a grindstone, it is worn with the polishing process. Therefore, in order to perform high-precision polishing, the relative position between the brush-shaped grindstone and the workpiece is adjusted according to the number of workpieces processed (abrasion amount of the brush-shaped grindstone), and the amount of cut with respect to the workpiece is kept constant. Need to be maintained. In addition, the brush-like grindstone using inorganic long fibers has a cutting edge for the workpiece as compared to the case of using a nylon brush or wire brush containing abrasive powder because the tip of the linear abrasive becomes a substantial polishing part. Since it is necessary to increase the polishing efficiency by shallowing, it is preferable to polish at a portion of about 0.5 mm at the tip of the linear abrasive. Therefore, in order to perform high-precision polishing using a brush-like grindstone using inorganic long fibers, it is necessary to control the relative position between the brush-like grindstone and the workpiece with higher precision. There is a problem that the control program becomes complicated. However, if there is a variation in the size of burrs due to variations in the pre-processing step, there is a problem that correction by the control program cannot cope.

  In view of the above problems, the object of the present invention is to stably exhibit the performance of this type of brush-like grindstone by always keeping the work cutting amount of the brush-like grindstone using inorganic long fibers constant. And a polishing method are provided.

  In order to solve the above-mentioned problem, in the present invention, a brush-like grindstone provided with a large number of linear abrasives obtained by impregnating and curing a binder resin in an aggregate yarn of inorganic long fibers and a workpiece are relatively moved to move the workpiece. In the polishing machine for polishing a surface, for the brush-like grindstone, a support mechanism that supports the brush-like grindstone so as to be movable in a direction toward the workpiece and a direction away from the workpiece, and the brush-like grindstone is directed toward the workpiece. An urging member for urging with a predetermined urging force and an urging force adjusting mechanism for adjusting the urging force of the urging member are configured. In this embodiment, deburring is performed by polishing using a brush-like grindstone, but it can also be said that burrs are cut with a linear abrasive, and in the present specification, polishing and cutting are not distinguished, and all are `` polishing ''. It expresses.

  Further, in the present invention, a polishing method for polishing the surface of a workpiece by relatively moving a brush-like grindstone provided with a large number of linear abrasives obtained by impregnating and curing a binder resin in an aggregate yarn of inorganic long fibers and the workpiece In the method, the workpiece is polished in a state where a constant load is applied to the brush-shaped grindstone toward the workpiece.

  Moreover, it is preferable that this invention has a biasing force adjustment mechanism which adjusts the biasing force of the biasing member which biases a brush-shaped grindstone toward a workpiece | work with a predetermined biasing force. If comprised in this way, since optimal urging | biasing force and a load can be set according to the performance of a brush-like grindstone, and the shape and material of a workpiece | work, a highly accurate grinding | polishing process can be performed.

  In the present invention, the brush-like grindstone includes, for example, a shank serving as a connecting portion to a tool holder on the base end side, and the tool holder includes a tool holder that holds the shank, and a base of the tool holder. A holder main body in which an end side is inserted inward and the support mechanism, the urging member, and the urging force adjusting mechanism are configured, and on the holder main body side, the support mechanism includes the brush-like grindstone The tool holder that holds the tool through the shank is supported so as to be movable in a direction toward and away from the workpiece, and the biasing member biases the brush-like grindstone through the tool holder. .

  In the present invention, the urging member is, for example, a compression coil spring, and the urging force adjusting mechanism adjusts the urging force of the compression coil spring by adjusting the length of the compression coil spring.

  The brush-like grindstone used in the polishing machine of the present invention is provided with a large number of linear abrasives obtained by impregnating and curing a binder resin on a collection yarn of inorganic long fibers, compared to nylon brushes and wire brushes containing abrasive powder. Strong polishing power. Therefore, it is possible to perform polishing processing on a work requiring high-precision deburring or surface finishing such as an automobile part or an aircraft part. In addition, since it is in the form of a brush, it is highly compatible with the workpiece, and fine deburring and surface finishing can be performed. Furthermore, since the brush-like grindstone grinds the workpiece in a state where a predetermined urging force and a load are applied by a floating mechanism including an urging member and an urging force adjusting mechanism, even if the linear abrasive is worn, The cutting load of the brush-like grindstone can be kept constant. Therefore, since the amount of cut into the workpiece can be maintained constant, the workpiece can be subjected to high-precision polishing. For this reason, the program which correct | amends and adjusts the relative position of a brush-shaped grindstone and a workpiece | work can be simplified. Moreover, in the brush-like grindstone, the adjustment interval of the protruding amount of the linear abrasive can be extended. Furthermore, even if there are variations in the size of burrs due to the influence of the pre-processing step, such variations can be absorbed, so that the finished state can be stabilized.

(Configuration of polishing machine)
FIG. 1 is a perspective view of a brush-like grindstone of the polishing machine of the present invention. FIG. 2 is a sectional view of the tool holder of the polishing machine of the present invention.

  1 and 2, a polishing machine 1 of the present invention includes a brush-like grindstone 10 (brush for a grinder) provided with a brush-like grindstone main body 13, and a tool holder 5 for connecting the brush-like grindstone 10 to a machining center. The machining center 100 is capable of program-controlling the position of the brush-like grindstone 10. Various polishing processes such as deburring and surface finishing of the workpiece are performed by rotating and driving a brush-like grindstone 10 connected to the machining center 100 via the tool holder 5 around the axis L. Here, the brush-like grindstone 10 is not limited to the rotational motion, and may perform a reciprocating motion, an oscillation motion, a swinging motion, or a motion combining these motions. Furthermore, the movement which moves the brush-like grindstone 10 up and down in the direction of the axis L may be combined. The operation of the brush-like grindstone 10 and the adjustment of the relative positions of the brush-like grindstone 10 and the workpiece are performed by a control program of the machining center 100.

(Configuration of brush-like grindstone)
As shown in FIG. 1, a brush-like grindstone 10 of the present invention includes a cylindrical metal brush case 12 having a shank 21 at the top, and a brush-like grindstone main body 13 with the upper portion inserted into the brush case 12. And screws 41 and 42 for fixing the brush-shaped grindstone main body 13 to a predetermined position in the brush case 12.

  At the center of the upper bottom portion of the brush case 12, an upper end portion of a round bar-shaped support shaft 25 is fixed. The support shaft 25 extends in the direction of the axis L concentrically with the peripheral wall 20 inside the brush case 12. Yes. Further, guide holes 26 and 27 extending in a groove shape parallel to the direction of the axis L are formed in the peripheral wall 20 of the brush case 12 at point symmetry positions with the axis L interposed therebetween. In the brush case 12, the peripheral wall 20 is made of aluminum, and the support shaft 25 is made of stainless steel.

  The brush-shaped grindstone main body 13 collectively bundles a large number of linear abrasives 32 obtained by impregnating and curing a binder resin in an aggregate yarn of inorganic long fibers such as alumina long fibers, and the base end side of these linear abrasives 32. And a cylindrical metal holder 31 to be held. A shaft hole 30 through which the support shaft 25 is inserted is formed at the center of the holder 31. In addition, a pair of screw holes 36 and 37 are formed on the peripheral wall of the holder 31 at point-symmetric positions with the axis L interposed therebetween. These screw holes 36 and 37 extend from the outer peripheral surface of the peripheral wall of the holder 31 to the shaft hole 30. It has arrived.

  When the brush-shaped grindstone 10 is assembled using the brush case 12 and the brush-shaped grindstone main body 13 configured as described above, the support shaft 25 is fitted into the shaft hole 30 of the holder 31 so that the support shaft 25 is fitted inside the brush case 12. After inserting the upper part (the holder 31 side) of the brush-shaped grindstone main body 13, the screws 41 and 42 are passed through the guide holes 26 and 27 from the outer peripheral side of the brush case 12 to the screw holes 36 and 37 of the holder 31. Stop 42 respectively. At this time, the screws 41 and 42 are tightened until the tips of the shaft portions of the screws 41 and 42 abut against the outer peripheral surface of the support shaft 25. As a result, the holder 31 is fixed on the support shaft 25 of the brush case 12 via the screws 41 and 42 inside the brush case 12.

  At this time, the screws 41 and 42 are held shallowly in the screw holes 36 and 37 of the holder 31 through the guide holes 26 and 27 of the brush case 12, and in this state, the brush-shaped grindstone main body 13 is moved along the axis line inside the brush case 12. If it moves to the direction of L, the position in the direction of the axis L of the brush-shaped grindstone main body 13 inside the brush case 12 can be adjusted. Therefore, since the protrusion dimension of the free end 33 of the linear abrasive 32 at the lower end portion 29 of the brush case 12 can be adjusted, the waist strength of the linear abrasive 32, that is, the grindability and conformability can be improved. Can be optimized. In this embodiment, the protruding amount of the linear abrasive 32 is adjusted so that the workpiece can be polished using the tip of the linear abrasive 32 and a portion of about 5 mm.

(Configuration of tool holder)
In FIG. 1 and FIG. 2 again, the brush-like grindstone 10 is held by the tool holder 5 via the shank 21 protruding at the upper part of the brush case 12 and is connected to the machining center 100. The tool holder 5 includes a cylindrical tool holder 6 that holds the shank 21, a holder main body 7 in which the proximal end side of the tool holder 6 is inserted inside, and a floating mechanism that will be described below.

  The holder main body 7 includes a cylindrical tapered portion 71 that is reduced in diameter toward the proximal end side, a large-diameter cylindrical portion 72 that is positioned at the approximate center in the length direction, and a small-diameter cylindrical portion 73 on the workpiece side. . A circular attachment hole 50 for attaching the tool holder 5 to the machining center 100 is formed at the center of the end face 7a on the proximal end side of the holder body 7 so as to extend along the axis M. On the inner peripheral surface 50a of the mounting hole 50, a thread groove is formed in which the tool holder mounting bolt 91 of the machining center 100 is hinged. By tightening the tool holder mounting bolt 91, the tool mounting of the machining center 100 is performed. The tapered portion 71 of the holder main body 7 is drawn into the portion 101 and is fitted.

  A holding hole 75 extending along the axis M is formed at the center of the work-side end surface 7 b of the holder body 7. A portion of about 4/5 from the proximal end side of the tool holder 6 is inserted into the holding hole 75. In addition, a base end portion of a compression coil spring 80 that urges the brush-like grindstone 10 toward the workpiece via the tool holder 6 is in contact with the center of the bottom surface 75 a of the holding hole 75. A hole 76 having a diameter slightly smaller than the coil diameter is formed at the center of the bottom surface 75 a and corresponding to the coil opening of the compression coil spring 80. Communicate.

  An annular groove 72 a is formed in the circumferential direction on the outer peripheral surface of the cylindrical portion 72 of the holder body 7. On the bottom surface 72b of the annular groove 72a, a plurality of ball insertion holes 72c communicating with the holding hole 75 are formed at predetermined angular positions. These ball insertion holes 72 c are fitted with anti-rotation balls 77, and part of the anti-rotation balls 77 protrude into the holding hole 75. Further, a screw groove is formed on the inner peripheral surface of the ball insertion hole 72c, and there are a holding screw 78 for holding the rotation preventing ball 77 and a loosening prevention screw 79 for preventing the holding screw from loosening. It is screwed.

  The tool holder 6 is a cylindrical member, and a connecting hole 61 for receiving the shank 21 of the brush-like grindstone 10 extends along the axis M at the center of one end surface 6b located on the workpiece side. Is formed. A plurality of screw holes 62 communicating from the radial direction are formed around the connection hole 61, and the shank 21 is fixed from the circumferential direction by a fixing screw (not shown) hinged to the screw hole 62.

  A spring hole 65 into which a compression coil spring 80 attached to the holder body 7 is inserted is formed at the center of the other end face 6 a of the tool holder 6 so as to extend along the axis M. An adjustment bolt attachment hole 66 is formed along the axis M at the center of the bottom surface 65 a of the spring hole 65, and the adjustment bolt attachment hole 66 communicates with the connection hole 61.

  A thread groove is formed in the inner peripheral surface 66a of the adjustment bolt mounting hole 66, and an adjustment bolt 85 is screwed from the base end side, while a lock bolt 86 is screwed from the work side. . The adjustment bolts 85 and the lock bolts 86 are formed with hexagonal wrench fitting recesses 85c and 86c at the centers of the end surfaces of the heads 85a and 86a, respectively. In the state shown in FIG. 2, the adjustment bolt 85 is deeply tightened until the end surface end surface 85 b comes into contact with the front end surface 86 b of the lock bolt 86, thereby preventing further tightening of the adjustment bolt 85. Yes.

  Here, the end of the compression coil spring 80 is in contact with the head of the adjustment bolt 85. For this reason, the tool holding body 6 is urged toward the workpiece side by the compression coil spring 80 via the adjustment bolt 85.

  Further, on the outer peripheral surface 60 of the tool holder 6, groove-shaped detent recesses 68 extending along the axis M are formed at predetermined angular positions. In these detent recesses 68, the ball of the holder body 7 is inserted. A detent ball 77 mounted in the hole 72c partially enters. For this reason, the tool holder 6 is restricted from spinning around the axis M.

  Here, the rotation stopper recess 68 and the rotation stop ball 77 are moved away from the tool holder 6 and the brush-like grindstone 10 toward the workpiece and from the workpiece only by a distance corresponding to the length dimension of the rotation stopper recess 68 in the axis M direction. It functions as a support mechanism that supports it so that it can move away from it. However, since the tool holder 6 is urged toward the workpiece by the compression coil spring 80 via the adjustment bolt 85, the anti-rotation ball 77 is in contact with the end of the anti-rotation recess 68. . Therefore, the tool holder 6 is allowed to move in the direction indicated by the arrow M1 from the state shown in FIG. 2, but is restricted from moving in the direction indicated by the arrow M2.

  When the workpiece is polished using the brush-shaped grindstone 10 configured as described above, the brush-shaped grindstone 10 polishes the workpiece in a state where a constant load corresponding to the urging force of the compression coil spring 80 is applied. For this reason, even when the linear abrasive 33 is worn, the brush-like grindstone 10 has a constant cutting load on the workpiece, and therefore polishes the workpiece with a constant cutting amount with high accuracy.

(Biasing force adjustment mechanism)
Further, in this embodiment, the coil opening 80a of the compression coil spring 80 and the hexagonal wrench fitting recess 85c formed at the center of the head of the adjustment bolt 85 are in a position coincident with the axis M direction. A small hole 76 is formed at a position corresponding to the coil opening 80 a of the compression coil spring 80, and the hole 76 communicates with the mounting hole 50. Therefore, if the hexagon wrench is inserted from the mounting hole 50, the adjustment bolt 85 is loosened, and the length of the compression coil spring 80 is shortened as shown in FIG. 3, the urging force can be increased. On the contrary, in the state shown in FIG. 3, when the urging force of the compression coil spring 80 is too strong, the length of the compression coil spring 80 can be lengthened to weaken the urging force by tightening the adjustment bolt 85. it can.

(Effect of this embodiment)
As described above, the brush-like grindstone 10 used in the polishing machine 1 of this embodiment has a large number of linear abrasives 33 formed by impregnating and curing a binder resin on an aggregate yarn of inorganic long fibers such as alumina long fibers. Therefore, it is possible to grind workpieces that require high-precision deburring and surface finishing such as automobile parts and aircraft parts. Moreover, since it is a brush-like grindstone, it is highly compatible with the workpiece, and fine deburring and surface finishing can be performed.

  In this embodiment, the tool holder 6 that holds the brush-like grindstone 10 is supported by the holder body 7 so as to be movable in the direction toward the workpiece and in the direction away from the workpiece. Further, the tool holder 6 that holds the brush-like grindstone 10 is urged by the compression coil spring 80 toward the workpiece with a predetermined urging force. Therefore, even if the brush-shaped grindstone main body 13 of the brush-shaped grindstone 10 is worn due to deburring or surface finishing, the cutting load of the brush-shaped grindstone main body 13 can be kept constant. As a result, the amount of cut into the workpiece can be kept constant, so that the workpiece can be polished with high accuracy. Further, even if the brush-shaped grindstone main body 13 is worn, the amount of cutting of the brush-shaped grindstone main body 13 into the work can be kept constant by the mechanical configuration, so that the polishing is made shallower and the polishing processing efficiency is increased. Even when the processing method is used, the control program for adjusting the relative position between the brush-shaped grindstone main body 13 and the workpiece can be simplified. In addition, even if the burrs vary in size due to variations in the processing accuracy of the pre-processing, the amount of cut into the workpiece can always be kept constant. As a result, since the wear amount of the brush-like grindstone is constant, the deburring and surface finishing processing accuracy does not become unstable.

  Further, in this embodiment, the urging force of the compression coil spring 80 that urges the brush-like grindstone 10 having the brush-like grindstone main body 13 toward the work can be adjusted by the adjusting bolt 85. Therefore, an appropriate biasing force can be set in accordance with the wear state of the brush-like grindstone main body 13, the material of the workpiece, and the polishing method, and high-precision polishing can be performed. Further, the work of loosening and tightening the adjustment bolt 85 can be easily adjusted by inserting a hexagon wrench from the attachment hole 50 on the base end side of the holder body 7.

(Other forms)
In the above embodiment, the shank 21 of the brush-like grindstone 10 is inserted into the connection hole 61 of the tool holder 6 and the shank 21 is fixed with screws from the circumferential direction. However, the collet chuck is provided on the tool holder 6 and this collet The shank 21 of the brush-like grindstone 10 may be held by a chuck. Moreover, if the structure which inserts and fixes to the connection hole 61 in the state which covered the sleeve on the shank 21 is employ | adopted, since it can respond to the shank 21 of various sizes, it can respond to the brush-shaped grindstone from which a shank diameter differs.

  In the above embodiment, a brush-like grindstone provided with a large number of linear abrasives obtained by impregnating and curing a binder resin in an aggregate yarn of alumina long fibers was used, but a binder resin was impregnated in an aggregate yarn of inorganic long fibers, A brush-like grindstone provided with a large number of cured linear abrasives may be used, and is not limited to alumina long fibers.

  The brush-like grindstone used in the polishing machine of the present invention is equipped with a large number of linear abrasives obtained by impregnating and curing a binder resin on an aggregate yarn of inorganic long fibers, and therefore has a high polishing power. Polishing can be performed on workpieces that require high-precision deburring and surface finishing such as aircraft parts. In addition, since it is in the form of a brush, it is highly compatible with the workpiece, and fine deburring and surface finishing can be performed. Furthermore, since the brush-like grindstone grinds the workpiece in a state where a predetermined urging force and a load are applied by a floating mechanism including an urging member and an urging force adjusting mechanism, even if the linear abrasive is worn, The cutting load of the brush-like grindstone can be kept constant. Therefore, since the amount of cut into the workpiece can be maintained constant, the workpiece can be subjected to high-precision polishing. For this reason, the program which correct | amends and adjusts the relative position of a brush-shaped grindstone and a workpiece | work can be simplified. Moreover, in the brush-like grindstone, the adjustment interval of the protruding amount of the linear abrasive can be extended. Furthermore, even if there are variations in the size of burrs due to the influence of the pre-processing step, such variations can be absorbed, so that the finished state can be stabilized.

It is a perspective view of the brush-shaped grindstone used for the polisher of this invention. It is sectional drawing of the tool holder of the polisher of this invention. In the polisher of this invention, it is sectional drawing of a tool holder at the time of strengthening the urging | biasing force to a tool holding body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Polishing machine 5 Tool holder 6 Tool support body 7 Holder main body 10 Brush-like grindstone 13 Brush-like grindstone main body 21 Shank 77 Anti-rotation ball 80 Compression coil spring 85 Adjustment bolt 86 Lock bolt 100 Machining center

Claims (4)

In a polishing machine that polishes the surface of a workpiece by relatively moving a brush-like grindstone comprising a large number of linear abrasives formed by impregnating and curing a binder resin into a set yarn of inorganic long fibers, and the workpiece,
For the brush-shaped grindstone, a support mechanism that supports the brush-shaped grindstone so that the brush-shaped grindstone can move in a direction away from the workpiece and a direction away from the workpiece, a biasing member that biases the brush-shaped grindstone toward the workpiece, A polishing machine comprising an urging force adjusting mechanism for adjusting an urging force of the urging member. In Claim 1, the said brush-like grindstone equips the base end side with the shank used as the connection part to a tool holder,
The tool holder includes a tool holding body for holding the shank, a holder in which a proximal end side of the tool holding body is inserted inside, and the supporting mechanism, the biasing member, and the biasing force adjusting mechanism are configured. With a body,
On the holder body side, the support mechanism supports the tool holder for holding the brush-like grindstone via the shank so as to be movable in a direction toward the workpiece and in a direction away from the workpiece, and the biasing member is A polishing machine for biasing the brush-like grindstone through the tool holder.   3. The biasing member according to claim 2, wherein the biasing member is a compression coil spring, and the biasing force adjusting mechanism adjusts a biasing force of the compression coil spring by adjusting a length dimension of the compression coil spring. A characteristic polishing machine. In a polishing method for polishing the surface of a workpiece by relatively moving a brush-like grindstone provided with a large number of linear abrasives obtained by impregnating and curing a binder resin on an aggregate yarn of inorganic long fibers, and the workpiece,
A polishing method comprising polishing a workpiece while applying a constant load toward the workpiece on the brush-like grindstone.

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