JP5649499B2 - Brush grinding machine - Google Patents

Description

  The present invention relates to a brush grinding apparatus for grinding a workpiece using a grinding brush in which abrasive strands containing abrasive grains are bundled.

  2. Description of the Related Art Conventionally, a brush grinding apparatus that polishes or grinds a workpiece by rotating a grinding brush attached to the lower surface of the brush holder integrally with the brush holder is known (see Patent Document 1).

  In this type of brush grinding apparatus, a position having a predetermined distance from the distal end (hair tip) of the grinding brush to the base end side is constrained, thereby preventing the grinding brush from warping or spreading. When the grinding brush wears out by performing grinding work for a long time and the length dimension from the restraint position to the bristles becomes short, the restraint position is moved to the proximal end side of the grinding brush to move from the restraint position. The length dimension to the bristles is kept constant.

  Moreover, the brush grinding apparatus of patent document 1 is provided with the constraint force variable means which restrains the restraint force of the grinding brush in the said restraint position variably. As a result, the strength of the restraining force with respect to the grinding brush can be freely set. Therefore, not only can the grinding force be increased to grind the workpiece into a desired shape, but also the restraining force can be reduced. Thus, polishing processing with a relatively small processing amount such as surface treatment of the workpiece and deburring of the edge can be performed.

  The grinding brush is formed by bundling a large number of abrasive strands containing abrasive grains at the base end (base), but the brush strands rub against each other during grinding and the individual brush strands become thin. So-called self-abrasion occurs. For this reason, the entire outer diameter of the grinding brush is reduced, the restraint state of the restraint position is loosened, and the waist from the restraint position to the hair tip may be weakened, which may deteriorate the grinding accuracy. According to the variable means, the restraining force can be increased according to the degree of reduction of the outer diameter of the grinding brush, so that the waist from the restraining position to the bristles can be kept constant.

  By the way, the entire length of the grinding brush is shortened due to wear of the tip portion accompanying the grinding operation. The grinding brush that has been worn to a length that is incompatible with the grinding operation is replaced with a new one. In this case, the use of a grinding brush with a relatively long initial length in the direction of the bristle increases the allowable range for wear, so the frequency of replacement of the grinding brush can be reduced and the efficiency associated with the replacement work decreases. Can be prevented.

  However, the longer the initial length of the grinding brush, the weaker the waist over the entire length and the easier it is to bend.Therefore, even if restrained at the restraint position, the waist from the restraint position to the tip of the hair is adversely affected. Decrease in processing efficiency and processing accuracy.

  Therefore, it is conceivable to bind a predetermined region between the base end portion of the grinding brush and the restraining position with a binding member such as a heat shrinkable tube. By doing so, the brush strands constituting the grinding brush are united together, and a sufficient waist strength can be obtained even with a grinding brush having a long initial length.

  However, when the grinding brush wears and the restraining position is moved to the base end side, it is necessary to remove the binding member such as the heat shrinkable tube. When a large number of grinding brushes are attached to the brush holder, there is an inconvenience that the operation of removing the binding members from the individual grinding brushes is extremely troublesome.

Japanese Patent No. 4160541

  In order to eliminate such inconveniences, the present invention not only can prevent a reduction in the binding force of the tip due to self-abrasion of the grinding brush, but also can reduce the waist strength even with a grinding brush having a relatively long overall initial dimension. It is an object of the present invention to provide a brush grinding apparatus capable of performing a grinding operation while preventing a decrease in the height.

In order to achieve such an object, the brush grinding apparatus of the present invention includes a grinding brush formed by binding a plurality of abrasive strands of brush wire at a base end, and the grinding brush with the tip of the grinding brush facing downward. A brush holder for connecting and holding the base end portion of the brush, and a brush grinding apparatus for grinding a workpiece with the tip end portion of the grinding brush, which is formed in a cylindrical shape and extends from the base end portion of the grinding brush in the direction of the hairs And covering the outer periphery to restrict the bending of the grinding brush, the brush receiving member for accommodating the grinding brush with the tip end side of the grinding brush protruding from the lower end opening, and the brush holding member positioned below the brush holder A support plate that supports a brush housing member, a brush shaft that connects the brush holder and a base end portion of the grinding brush housed in the brush housing member, and a lower end portion of the brush housing member And a restraining force varying means for restraining the grinding brush releasably and varying a restraining force on the grinding brush by expanding and contracting a substantial diameter of a lower end opening of the brush housing member, and the restraining force varying means A brush push-out means for causing the grinding brush to protrude from the lower end opening of the brush housing member by lowering the grinding brush via the brush shaft when the restriction of the grinding brush is released . The restraining force varying means is formed at a lower end portion of the brush housing member from which the grinding brush protrudes, and has an elastic opening that can be reduced in diameter while having elasticity in a diameter expanding direction, and an outer peripheral surface of the elastic opening. A tapered surface that is formed and gradually expands in the downward direction, and is moved against the tapered surface by moving up and down relative to the brush housing member while being in contact with the tapered surface. Characterized Rukoto a contact member for scaling the diameter of the elastic opening depending on the position.

  According to the brush grinding apparatus of the present invention, the grinding brush is accommodated in the brush accommodating member, and the workpiece is ground by the tip of the grinding brush protruding from the lower end opening of the brush accommodating member. At this time, since the tip of the grinding brush is restrained by the restraining force variable means with a predetermined dimension protruding from the brush housing member, lateral warping and spreading at the tip of the grinding brush are reliably prevented. Grinding can be performed in the state.

  When the tip of the grinding brush is worn, the restraint by the restraining force variable means is released, the grinding brush is pushed out through the brush shaft by the brush pushing means, and the tip of the grinding brush is the lower end of the brush housing member. A state of projecting a predetermined dimension from the opening can be maintained.

  And even if the outer diameter of a front-end | tip part reduces by self-abrasion of a grinding brush, the fall of a restraint force can be prevented by following this and increasing a restraint force. Thereby, the waist of the grinding brush of the part protruded from the said brush accommodating member can be maintained at sufficient intensity | strength, and the fall of processing precision can be prevented.

  According to this, the grinding brush can be restrained by the restraining force varying means, and the restraining force can be changed and released by moving the abutting member along the tapered surface of the elastic opening.

  Further, in the brush grinding apparatus of the present invention, the brush shaft is rotatably supported by the brush holder, and the brush holder is released when the restraint of the grinding brush by the restraining force varying means is released. A brush shaft rotating means for rotating the grinding brush by a predetermined angle via the brush shaft is provided.

  According to this, when making a grinding brush protrude from the said brush accommodating member, a grinding brush can be rotated to the surroundings of the axis line of the bristle direction by the said brush axis | shaft rotation means, and the front-end | tip of the grinding brush accompanying the grinding operation | work of a workpiece | work Uneven wear of the (hair tip) can be prevented.

  Moreover, the brush grinding apparatus of this invention WHEREIN: It is preferable that the uneven surface by the protruding item | line extended in the circumferential direction is formed in the internal peripheral surface of the lower end part of the said brush accommodating member. According to this, the uneven surface can bite into the grinding brush restrained by the restraining force variable means at the lower end of the brush housing member, and the restrained grinding brush can be firmly fixed to the brush housing member. .

  In the brush grinding apparatus of the present invention, it is preferable that the grinding brush and the brush shaft are detachably connected to each other by screwing. According to this, even if the brush shaft extends inside the brush housing member and the tip of the brush shaft is located inside the brush housing member, the grinding brush and the brush shaft are simply rotated in the relative direction. In addition, the grinding brush and the brush shaft can be coupled by screwing and separated by unscrewing. Therefore, it is not necessary to connect and release the grinding brush and the brush shaft outside the brush housing member, and the grinding brush can be replaced very easily.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory sectional drawing which shows the brush grinding apparatus of the 1st Embodiment of this invention. Explanatory sectional view showing the connection state between the grinding brush and the brush shaft An explanatory side view showing a brush accommodation member. Explanatory sectional drawing which shows the principal part of 1st Embodiment, and its operation | movement. Explanatory sectional drawing which shows the brush grinding apparatus of the 2nd Embodiment of this invention. Explanatory sectional drawing which shows the principal part and operation | movement of 2nd Embodiment.

  As shown in FIG. 1, the brush grinding apparatus 1 according to the first embodiment of the present invention includes a disc-shaped brush holder 2 and a plurality of grinding brushes 3. Each grinding brush 3 is arranged below the brush holder 2 with a circumferential interval, and each grinding brush 3 is rotatably supported by the brush holder 2 and connected to the lower end of the brush shaft 4 extending downward. Has been. Moreover, the grinding brush 3 is accommodated in the inside of the brush accommodating member 5 formed in the cylinder shape. The brush housing member 5 is fixedly supported by a screw member 7 on a disk-shaped first support plate 6 disposed below the brush holder 2. In addition, at the lower end portion of the brush housing member 5, a constraint force varying means 8 described later is provided.

  As shown in FIG. 2, the grinding brush 3 has a large number of brush strands 9 formed of synthetic fibers such as nylon mixed with abrasive grains bound at the base end with a wire 10, and the outside is a cap member. 11 is covered. The wire 10 is made of, for example, a wire, and the cap member 11 is made of, for example, a metal such as stainless steel.

  The cap member 11 includes a female screw member 12, and the male screw portion 14 connected to the lower end of the brush shaft 4 via the flange 13 is screwed to the female screw member 12 to thereby engage the brush shaft 4. It is connected to the grinding brush 3.

  As shown in FIG. 3, the brush housing member 5 includes an upper end wall 15 through which the brush shaft 4 slidably passes, and a grinding brush that extends downward in a cylindrical shape from the periphery of the upper end wall 15 and is connected to the brush shaft 4. 3 is provided with a mantle portion 16 covering the outer periphery of 3 and an elastic opening portion 17 provided below the mantle portion 16. The elastic opening 17 is gradually thickened downward, and a tapered surface 18 is formed on the outer peripheral surface of the elastic opening 17 so as to gradually increase in diameter downward. As shown in FIG. 3, the elastic opening 17 has a collet shape including a plurality of slits 19 extending in the vertical direction and having lower ends opened, and can be reduced in diameter while having elasticity in the diameter increasing direction. Yes. Furthermore, an uneven surface is formed on the inner peripheral surface of the elastic opening 17 by the protruding ridges 20 extending in the circumferential direction.

  As shown in FIG. 1, the elastic opening 17 is inserted through an annular contact member 21 that is slidably contacted with the tapered surface 18. A disk-shaped second support plate 22 is disposed below the first support plate 6. A through hole 23 is formed in the second support plate 22 at a position corresponding to the brush housing member 5, and the contact member 21 is inserted into and supported by the through hole 23. The first support plate 6 and the second support plate 22 correspond to the support plate in the present invention.

  The restraining force varying means 8 includes an elastic opening 17 that is a part of the brush housing member 5, a tapered surface 18 formed on the outer periphery thereof, and a contact member 21 supported by the second support plate 22. It is composed. That is, as shown in FIG. 4A, the abutting member 21 presses the large diameter side of the tapered surface 18 from the outside, whereby the inner diameter of the elastic opening 17 is reduced and the grinding brush 3 is restrained. To do. At this time, the ridges 20 constituting the concavo-convex surface on the inner peripheral surface of the elastic opening portion 17 bite into the grinding brush 3 and the grinding brush 3 is firmly restrained. As shown in FIG. 4B, when the contact member 21 is positioned on the small diameter side of the tapered surface 18, the elastic opening 17 is elastically expanded, and the grinding brush 3 is moved. It can be moved in the direction of the hair.

  In addition, although the protrusion 20 which forms the uneven | corrugated surface in the inner peripheral surface of the elastic opening part 17 may have a cross-sectional shape that may be a triangle or a quadrangle, the protrusion is formed in a spiral shape to have a female screw shape. Thus, the relative rotation between the grinding brush 3 and the brush housing member 5 is advantageous because the ridges 20 can be easily taken into the grinding brush 3.

  Further, as shown in FIG. 1, a flange member 24 is extrapolated on the outer periphery of the brush housing member 5, and a spring member 25 is provided below the flange member 24 between the upper surface of the contact member 21. It has been. The spring member 25 urges the brush housing member 5 upward via the flange member 24. Note that a circlip 26 is fitted and positioned above the flange member 24 in a groove portion 27 (see FIG. 3) formed on the outer periphery of the brush housing member 5.

  The second support plate 22 is connected to the lower end of a retracting rod 28 extending in the vertical direction. The pull-in rod 28 extends upward through a through hole 29 formed in the brush holder 2 and a through hole 38 formed in the first support plate 6, and an upper end thereof is movable up and down around a rotary shaft 30 described later. It is connected to the lift plate 31 provided. The elevating plate 31 is pulled upward by a cylinder 32 supported by a frame (not shown). When the cylinder 32 pulls up the lifting plate 31, the second support plate 22 is raised in a direction approaching the first support plate 6 through the retracting rod 28. Thereby, the contact member 21 relatively moves from the large diameter side of the tapered surface of the elastic opening 17 toward the small diameter side.

  A connecting rod 33 extending in the vertical direction passes through the first support plate 6 so as not to slide. The connecting rod 33 penetrates the brush holder 2 and the second support plate 22 so as to be freely slidable, and a saddle plate portion 34 projects around a cylindrical rotary shaft 30 disposed above the brush holder 2. It is connected through. The rotary shaft 30 is rotationally driven by a drive motor (not shown). The rotation of the rotating shaft 30 is transmitted to the brush holder 2, the first support plate 6 and the second support plate 22 by the connecting rod 33.

  The brush holder 2 is connected to a substantially cylindrical lifting shaft 35 slidably inserted into a cylindrical rotating shaft 30. The brush holder 2 moves up and down as the elevating shaft 35 is slid in the axial direction by elevating means (not shown). By lowering the brush holder 2, the grinding brush 3 can be lowered through the brush shaft 4 toward the bristles. The elevating means and elevating shaft 35 function as brush extruding means of the present invention.

  The brush shaft 4 is rotatably supported by the brush holder 2 and includes a driven gear 36 at the upper end. Although the driven gears 36 are provided on all the brush shafts 4 and are not shown, the driven gears 36 provided on the brush shafts 4 can transmit rotations to each other. One of the driven gears 36 is engaged with a drive gear 37 provided in a rotation driving means such as a servo motor (not shown) provided in the brush holder 2. The rotation driving means can be rotated by a predetermined rotation angle and functions as the brush shaft rotating means of the present invention for rotating the grinding brush 3 through the brush shaft 4 by a predetermined angle.

  Next, the operation | movement which concerns on the summary of this invention in the brush grinding apparatus 1 which consists of the above structure is demonstrated.

  Referring to FIG. 1, during grinding work of a workpiece (not shown), the brush holder 2 is rotated by the rotation of the rotary shaft 30, and the grinding brush 3 moves along a circular orbit concentric with the brush holder 2. And the workpiece | work can be ground by abutting the front-end | tip part of the grinding brush 3 which protrudes below from the lower end of the brush accommodating member 5 to a workpiece | work.

  At this time, the grinding brush 3 is not only reliably restrained by the elastic opening 17 of the brush housing member 5 constituting the restraining force varying means 8, but also above the restraining position by the elastic opening 17. Since the bending of the portion accommodated in 5 is restricted by the outer jacket portion 16, the waist can be strengthened over the entire length of the grinding brush 3. Thereby, not only high grinding accuracy can be obtained, but also the replacement frequency of the grinding brush 3 can be reduced by lengthening the entire length of the grinding brush 3, and the waste of the grinding brush 3 can be reduced.

  Further, since the bending of the grinding brush 3 located inside the brush housing member 5 is restricted by the outer cover portion 16, the brush strands 9 are relatively free from rubbing, and self-abrasion is also caused by the brush strands 9. It is suppressed. Thereby, the lifetime of the grinding brush 3 can be extended.

  Furthermore, since the degree of diameter reduction of the elastic opening 17 can be adjusted by the position of the contact member 21 with respect to the tapered surface 18, the restraining force of the grinding brush 3 can be easily increased or decreased. A waist suitable for the amount of processing can be applied to the tip of the grinding brush 3.

  Thereafter, the grinding brush 3 is worn by grinding, and as shown in FIG. 4A, the length (trim length L) of the tip of the grinding brush 3 protruding downward from the lower end of the brush housing member 5 is shortened. When grinding occurs, the grinding brush 3 is projected as follows.

  That is, as shown in FIG. 4B, first, by raising the second support plate 22, the abutting member 21 is moved toward the small diameter side of the tapered surface 18 relative to the elastic opening 17 as described above. It moves and the restriction of the grinding brush 3 by the elastic opening 17 is released. At this time, since the restraint of the grinding brush 3 by the elastic opening 17 is released at the raised position of the second support plate 22, the brush housing member 5 does not drag with respect to the grinding brush 3, and the grinding brush 3 self Abrasion can be suppressed.

  Next, the grinding brush 3 is lowered from the lower end of the brush housing member 5 by lowering the grinding brush 3 by the brush shaft 4. At this time, by rotating the grinding brush 3 through the brush shaft 4 by a predetermined angle, it is possible to prevent uneven wear occurring at the tip (tip) of the grinding brush 3.

  Then, as shown in FIG. 4C, by releasing the raised state of the second support plate 22, specifically, the second support plate 22 is lowered by the bias of the spring member 25 with respect to the brush housing member 5. Let Accordingly, the contact member 21 moves relative to the elastic opening 17 to the larger diameter side of the tapered surface 18, and the grinding brush 3 is restrained by the elastic opening 17. Thereby, since the trim length of the grinding brush 3 can be made constant, the state where the desired waist strength is imparted to the tip of the grinding brush 3 can be reliably maintained, and high processing accuracy is obtained. be able to.

  Next, a second embodiment of the present invention will be described. In the second embodiment, only the configuration different from the first embodiment will be described with reference to FIG. 5 and FIG. 6, and the same configuration as the first embodiment is the same as FIG. 1 and FIG. The description is omitted.

  The brush grinding apparatus 40 according to the second embodiment includes a pressing rod 41 that lowers the first support plate 6 as shown in FIG. 5 in place of the retracting rod 28 according to the first embodiment. The lower end of the pressing rod 41 is connected to the first support plate 6, extends upward through a through hole 29 formed in the brush holder 2, and the upper end thereof is connected to the lifting plate 31.

  The elevating plate 31 is pushed down by the cylinder 32 and descends. When the elevating plate 31 is lowered, the first support plate 6 is lowered in a direction approaching the second support plate 22 via the pressing rod 41. Thereby, the contact member 21 relatively moves from the large diameter side of the tapered surface of the elastic opening 17 toward the small diameter side.

  Moreover, the brush grinding apparatus 40 of 2nd Embodiment is provided with the connection rod 42 instead of the connection rod 33 of 1st Embodiment. The connecting rod 42 has an upper end connected to a flange plate portion 34 projecting around the rotary shaft 30, and passes through the first support plate 6 and the brush holder 2 slidably, and a second support plate at the lower end thereof. 22 are connected. The rotation of the rotation shaft 30 is transmitted to the brush holder 2, the first support plate 6 and the second support plate 22 by the connecting rod 42.

  As described above, the brush grinding apparatus 40 is configured such that the second support plate 22 is held at a fixed position by the connecting rod 42, and the first support plate 6 is moved relative to the second support plate 22 by the pressing rod 41. Has been.

  Explaining the operation of the brush grinding apparatus 40 having the above configuration, the grinding brush 3 is worn by grinding, and the grinding brush 3 protrudes downward from the lower end of the brush housing member 5 as shown in FIG. When the length of the front end portion (trim length L) is shortened, first, as shown in FIG. 6 (b), the first support plate 6 is lowered by pressing the pressing rod 41 (see FIG. 5). Thereby, the contact member 21 moves relatively to the small diameter side of the tapered surface 18 relative to the elastic opening 17, and the restriction of the grinding brush 3 by the elastic opening 17 is released.

  Next, the grinding brush 3 is lowered from the lower end of the brush housing member 5 by lowering the grinding brush 3 by the brush shaft 4. At this time, by rotating the grinding brush 3 through the brush shaft 4 by a predetermined angle, it is possible to prevent uneven wear occurring at the tip (tip) of the grinding brush 3.

  Then, as shown in FIG. 6C, by releasing the lowering state of the first support plate 6, the brush housing member 5 is raised with respect to the second support plate 22 by the urging of the spring member 25. Accordingly, the contact member 21 moves relative to the elastic opening 17 to the larger diameter side of the tapered surface 18, and the grinding brush 3 is restrained by the elastic opening 17. Thereby, since the trim length of the grinding brush 3 can be made constant, the state where the desired waist strength is imparted to the tip of the grinding brush 3 can be reliably maintained, and high processing accuracy is obtained. be able to.

  DESCRIPTION OF SYMBOLS 1,40 ... Brush grinding apparatus, 2 ... Brush holder, 3 ... Grinding brush, 4 ... Brush shaft, 5 ... Brush accommodating member, 6 ... 1st support plate (support plate), 8 ... Restraint force variable means, 9 ... Brush Elementary wire, 17 ... elastic opening, 18 ... taper surface, 20 ... ridge, 21 ... contact member, 22 ... second support plate (support plate), 35 ... lifting shaft (brush extrusion means).

Claims (3)

A grinding brush formed by bundling a plurality of abrasive-containing brush strands at the base end, and a brush holder for connecting and holding the base end of the grinding brush with the tip end of the grinding brush facing downward, In the brush grinding device that grinds the workpiece with the tip of the grinding brush,
It is formed in a cylindrical shape, and the bending of the grinding brush is restricted by covering the outer periphery from the base end portion of the grinding brush along the bristle direction, and the front end side of the grinding brush is freely protruded from the lower end opening. A brush housing member for housing the brush;
A support plate positioned below the brush holder and supporting the brush housing member;
A brush shaft that connects the brush holder and a base end of the grinding brush housed in the brush housing member;
A restraining force that is provided at a lower end portion of the brush housing member and releasably restrains the grinding brush and varies a restraining force on the grinding brush by expanding and contracting a substantial diameter of a lower end opening of the brush housing member. Variable means;
Brush extrusion that causes the grinding brush to protrude from the lower end opening of the brush housing member by lowering the grinding brush via the brush shaft when the restraint of the grinding brush by the restraining force varying means is released A brush grinding apparatus comprising: means ;
The brush shaft is rotatably supported by the brush holder,
The brush holder includes brush shaft rotating means for rotating the grinding brush by a predetermined angle via the brush shaft when the restriction of the grinding brush by the restraining force varying means is released. apparatus. The brush grinding apparatus according to claim 1, wherein
A brush grinding apparatus, wherein an uneven surface is formed by a ridge extending in the circumferential direction on an inner peripheral surface of a lower end portion of the brush housing member. The brush grinding apparatus according to claim 1 or 2,
The brush grinding apparatus, wherein the grinding brush and the brush shaft are detachably connected to each other by screwing each other.

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