WO2014142058A1

WO2014142058A1 - Centerless polishing device

Info

Publication number: WO2014142058A1
Application number: PCT/JP2014/056130
Authority: WO
Inventors: 靖雄野田; 雅雄平野
Original assignee: 新東工業株式会社
Priority date: 2013-03-12
Filing date: 2014-03-10
Publication date: 2014-09-18
Also published as: CN104220215B; CN104220215A; JP6202086B2; JPWO2014142058A1

Abstract

[Problem] To provide a centerless polishing device capable of efficiently polishing the outer circumferential surface and ends of a rod-shaped or cylindrical workpiece. [Solution] This centerless polishing device is provided with a roll brush, a workpiece-rotating wheel, and a workpiece-loading member. The bristle material of the roll brush is monofilaments obtained from nylon resin containing abrasive grains. The particle size of the abrasive grains is selected from between F60 - F240 or #240 - #2000. The content of the abrasive grains is 10 - 40 parts by weight with respect to 100 parts by weight of the entire bristle material. With said configuration, favorable polishing is possible without marring the outer circumferential surface of the workpiece or generating new burrs or edge-sagging at the ends during polishing.

Description

Centerless polishing equipment

The present invention relates to a centerless polishing apparatus in which a rod-shaped or cylindrical workpiece is put between a roll brush and a workpiece rotating wheel, and the outer periphery of the workpiece is polished.

A centerless polishing apparatus is known as an apparatus for uniformly polishing the outer periphery of a rod-shaped or cylindrical workpiece. As shown in FIG. 8, the centerless polishing apparatus includes a rotating polishing body, a work rotating wheel rotating in the same direction as the polishing body, and a workpiece mounting disposed between the polishing body and the work rotating wheel. A member. When the work is placed on the work placement member, the work is rotated by the work rotating wheel, and the outer periphery thereof is polished by contacting a polishing body that rotates in a direction opposite to the work.

A centerless polishing apparatus generally uses a rotating grindstone as a polishing body (for example, Patent Document 1). When a rotating grindstone is used as a polishing body as in Patent Document 1, the work surface is damaged by polishing. Moreover, a new burr | flash (secondary burr | flash) will arise by grinding | polishing at the edge part of a workpiece | work, or edge sagging will arise.

Patent Document 2 discloses a centerless polishing apparatus using a roll brush as the polishing body. Patent Document 2 does not mention the material of the brush bristle material of the roll brush. As the brush bristle material, it is conceivable to use “metal wire” or “chemical fiber or animal or plant fiber”. However, these brush bristle materials have the following problems and cannot be employed.
(A) When a metal wire is used for the brush bristle material When polishing with a highly rigid wire, the surface of the workpiece will be damaged, and secondary burrs may occur at the end of the workpiece due to polishing, It occurs. When polishing with a wire having low rigidity, the workpiece cannot be polished. In addition, metal wires break during polishing due to metal fatigue (fatigue failure) regardless of the strength of the rigidity (fatigue failure), and it is difficult to manage the finishing accuracy of the workpiece.
(B) When a chemical fiber or animal and plant fiber is used as a brush bristle material Although the work surface is not damaged by polishing, since the polishing ability is low, it takes a long time to complete the polishing.

Patent Document 3 discloses a centerless polishing apparatus in which the brush bristle material is nylon resin. In Patent Document 3, a stopper for fixing the work is arranged in order to solve the problem when the brush bristle material is nylon resin, “the work cannot be processed uniformly because the polishing power is low”. In addition, it discloses that polishing is performed by reciprocating the work rotating wheel in the longitudinal direction of the work. In the configuration of this device, a mechanism for reciprocating the work rotating wheel is required, so that the device becomes complicated and the size of the device increases. In addition, since a plurality of workpieces cannot be polished continuously, productivity is poor.

Japanese Utility Model Publication No. 05-078459 Japanese Patent Laid-Open No. 01-115567 JP-A-10-109256

When polishing the outer periphery and end of a rod-shaped or cylindrical workpiece, the present invention is efficient without causing damage to the outer peripheral surface of the workpiece or causing secondary burrs or edge sagging due to polishing at the end of the workpiece. It is an object of the present invention to provide a centerless polishing apparatus and a polishing method that can polish well.

The present invention is a centerless polishing apparatus for polishing an outer peripheral surface and an end of a rod-like or cylindrical workpiece, the centerless polishing apparatus includes a roll brush in which tips of a plurality of brush bristle materials are exposed on the outer peripheral surface, A work rotating wheel having a rotation transmitting member provided on an outer peripheral surface, and a work placing member erected between the roll brush and the work rotating wheel, wherein the brush bristle material has a particle size of F60 to F240 or # The abrasive grains of 240 to # 2,000 are monofilaments made of nylon resin containing 10 to 40 parts by weight with respect to 100 parts by weight of the whole brush bristle material. If the grain size of the abrasive grains is too small, the brush bristle material cannot obtain a sufficient polishing force, and if it is too large, the polishing force is too strong and the outer peripheral surface of the workpiece is damaged by polishing, or the end portion of the workpiece is damaged by polishing. Next burr and sag occur. Moreover, when there is too little content of an abrasive grain, sufficient grinding | polishing power will not be acquired, and when too much, the rigidity of a brush bristle material will become strong too much and it will break during grinding | polishing. As in the present invention, a monofilament made of a nylon resin containing abrasive grains is used as a brush bristle material, and the outer peripheral surface of the workpiece may be damaged by selecting the abrasive grain size and abrasive grain content from the above ranges. Polishing can be performed satisfactorily without causing secondary burrs or edge sagging due to polishing at the end of the workpiece.

Further, the workpiece placement member may be plate-shaped, and the upper end of the longitudinal section perpendicular to the longitudinal direction of the workpiece placement member may be horizontal. A workpiece is placed on the upper end surface of the workpiece placement member. The upper end surface of the workpiece placing member of the conventional centerless polishing apparatus is inclined so that the center of gravity of the placed workpiece is directed toward the workpiece rotating wheel. For example, when a metal wire is used for the brush bristle material, the tip of the wire bites the work, and the work tries to rotate in conjunction with the rotation of the roll brush. Therefore, a general centerless polishing apparatus is configured to increase the force for transmitting the rotational force of the work rotating wheel by inclining the upper end of the work placing member to press the work against the work rotating wheel by its own weight. Since the brush bristle material of the centerless polishing apparatus of the present invention is a monofilament made of nylon resin containing abrasive grains, the biting force is not too strong and the rotation of the workpiece is not hindered. Therefore, even if the upper end of the work placing member is horizontal, the rotational force of the work rotating wheel can be transmitted satisfactorily, so that the polishing force of the brush bristle material can be sufficiently exhibited.

Further, the roll brush is arranged by inserting one end of a plurality of brush bristle materials cut into a predetermined length into the groove of a long base having a U-shaped groove in cross section, A brush band formed by fixing a brush bristle material in the groove may be formed by winding the outer periphery of a cylindrical brush base material. Since the interval at which the brush band is wound can be adjusted, the density of the brush bristle material can be selected in consideration of the target polishing force and the shape of the workpiece.

Further, the rotation transmission member may be a non-woven fabric. The centerless polishing apparatus of the present invention can satisfactorily transmit the rotation of the workpiece rotating wheel to the workpiece without using a material having a very high friction coefficient such as rubber as the rotation transmitting member. When a non-woven fabric is used for the rotation transmission member, replacement when the rotation transmission member is worn becomes easy, so that maintainability is improved.

A work transfer mechanism comprising: a work carry-in mechanism for moving the work forward to the work placement member; and a work carry-out mechanism for carrying the work that has passed through the work placement member out of the centerless polishing apparatus. Prepare. The workpiece loading mechanism is a workpiece loading feeder that generates a force to advance the workpiece, and a workpiece loading member having a V-shaped groove, one end of which is on the side of the workpiece placement member on which the workpiece loading feeder is disposed. And a workpiece carry-in member arranged on the end side. The workpiece unloading mechanism may include a workpiece unloading member having a V-shaped groove and disposed so as to be positioned on the other end side of the workpiece placing member. When starting to polish the workpiece, the workpiece is conveyed by the workpiece carry-in feeder, and when one end of the workpiece is placed on the workpiece placing member, that is, between the roll brush and the workpiece rotating wheel, only the rotation of the workpiece rotating wheel is required. The work advances. Thus, the workpiece can be polished continuously. Further, the workpiece carry-in member and the workpiece carry-out member have V-shaped grooves, which form a workpiece conveyance path. By arranging the workpiece carrying-in member and the workpiece carrying-out member at both ends of the workpiece placing member, it is possible to improve straightness when the workpiece advances and to prevent the workpiece from being bent by its own weight. The outer periphery can be evenly polished. That is, the roundness of the workpiece after polishing can be improved by the workpiece carry-in member and the workpiece carry-out member.

Further, a work guide member for placing a work in the center of the work placing member may be provided on the end side of the carry-in member. The work guide member improves the straightness when the work advances.

In addition, a polishing unit comprising a polishing mechanism including the roll brush and a mechanism for rotating the roll brush, and a workpiece rotating mechanism including the workpiece rotating wheel and a mechanism for rotating the workpiece rotating wheel, and a workpiece advance direction. Two or more may be connected to each other. Polishing time can be shortened by providing a plurality of polishing units. Further, by disposing the roll brush so that the rotation directions thereof are opposite to each other, it is possible to uniformly process a work portion of a workpiece which has been subjected to, for example, notching or hole machining.

Further, the polishing method for polishing the outer peripheral surface and the end portion of the rod-shaped or cylindrical workpiece using the centerless polishing apparatus is the same as the step of rotating the roll brush and the rotation direction of the roll brush. A step of rotating in the direction, a step of placing one end of the workpiece on the workpiece placement member, and the rotation of the workpiece rotating wheel being transmitted to the workpiece via the rotation transmission member and rotating the workpiece. And a step of advancing the workpiece, and a step of polishing the outer peripheral surface and the end of the workpiece when the advancing workpiece contacts the roll brush, and adjusting the rotation speed of the workpiece rotating wheel. And a step of adjusting the forward speed of the workpiece. In the prior art, generally adjusting the tilt angle of the workpiece rotating wheel (the angle formed when the workpiece on the workpiece mounting member moves horizontally along the longitudinal direction of the workpiece mounting member). Adjust the workpiece forward speed. Therefore, when adjusting the work advance speed, it is necessary to change and adjust the work placement member each time. With the configuration of the present invention, the work advance speed can be adjusted by adjusting the work speed of the work rotating wheel, so that the polishing conditions can be easily set.

¡When a metal wire is used as a brush bristle material, the outer peripheral surface of the workpiece is damaged by polishing. Further, secondary burrs and edge sagging occur at the end of the workpiece due to polishing. If the brush bristle material is simply made of resin, the polishing ability is insufficient, and it takes a long time to complete the polishing. By polishing the workpiece with the centerless polishing apparatus of the present invention, the outer peripheral surface of the workpiece is not damaged, and secondary burrs and edge sag due to polishing are not generated at the end of the workpiece, and the workpiece is polished well. be able to.

Since metal wires are prone to fatigue failure, they break as the polishing time elapses. When polishing with the centerless polishing apparatus of the present invention, the tip of the brush bristle material wears uniformly without breaking. This makes it easy to manage the amount of cut (the amount by which the brush bristle material is pressed against the workpiece), so that the finishing accuracy can be easily managed.

Polishing is generally performed while spraying a cooling liquid onto the workpiece and the brush, so that the metal wire is corroded by this cooling liquid. For this reason, when polishing is performed using a metal wire as a brush bristle material, corrosion (rust) of the wire adheres to the workpiece. Since the rust adheres firmly, it is difficult to remove from the workpiece. In the centerless polishing apparatus of the present invention, since the monofilament made of nylon resin containing abrasive grains is used as the brush bristle material, there is no corrosion, so there is no problem that rust adheres to the workpiece by polishing.

It is a schematic diagram which shows the external appearance of the centerless grinding | polishing apparatus of 1st embodiment of this invention. FIG. 1A is a schematic diagram illustrating a cross section viewed from the right side direction, and FIG. 1B is a schematic diagram illustrating a cross section viewed from above. It is a schematic diagram which shows the polishing brush in 1st embodiment of this invention. FIG. 2A is a schematic diagram showing a partial cross section viewed from the front, and FIG. 2B is a schematic diagram showing a cross section of a brush strip. It is a schematic diagram which shows the workpiece | work rotation wheel in 1st embodiment of this invention, Comprising: It is a schematic diagram which shows the partial cross section seen from the front. The surface roughness profile (R curve) of the workpiece | work which grind | polished in the Example and the comparative example is shown. It is a contour shape curve which shows the measurement result of the contour shape of the edge part in the workpiece | work before a process, and the workpiece | work grind | polished in the Example and the comparative example. It is a schematic diagram which shows the external appearance of the centerless grinding | polishing apparatus of 2nd embodiment of this invention. FIG. 6A is a schematic diagram illustrating a cross section viewed from the right side direction, and FIG. 6B is a schematic diagram illustrating a cross section viewed from the plane direction. In 2nd embodiment of this invention, it is a schematic diagram which shows an example of the workpiece | work which has processed. It is a schematic diagram which shows the principal part of the conventional centerless grinding | polishing apparatus. It is a schematic diagram which shows the external appearance seen from the front of the centerless grinding | polishing apparatus of 1st embodiment of this invention.

An example of the centerless polishing apparatus of the present invention will be described as an embodiment with reference to the drawings. The centerless polishing apparatus of the present invention is not limited to the embodiment and can be changed as appropriate. In the description of the embodiment, “up / down / left / right” directions indicate directions in the drawing unless otherwise specified.

(First embodiment)
As shown in FIG. 1, the centerless polishing apparatus 01 of the first embodiment of the present invention includes a polishing mechanism 10, a work rotating mechanism 20, a work placing member 30, a cut amount adjusting mechanism 40, and a gap adjusting mechanism 50. A workpiece transfer mechanism 60, a housing 70, a coolant circulation mechanism 80, and a control means 90.

The polishing mechanism 10 includes a roll brush 11 and a mechanism for rotating the roll brush 11. As shown in FIG. 2, the roll brush 11 includes a cylindrical core member 11a, a rotating shaft 11b fixed to the axis of the core member 11a, and a brush bristle material fixed to the outer peripheral surface of the core member 11a. 11f.

The core member 11a has a cylindrical shape, and a boss member 11c is fixed at the center of the longitudinal section and at the center of the circular section. The end of the rotating shaft 11b is fixed to the boss member 11c. With such a structure, the weight of the roll brush 11 is reduced, so that the motor 12 with a small output can be used.
Further, only one end side of the rotating shaft 11b protrudes from the core member 11a. The roll brush 11 is pivotally supported by the protruding portion of the rotating shaft 11b. However, since the core member 11a is light, it can be pivotally supported only on one side of the roll brush 11.

In addition, when the roll brush 11 rotates, the weight (balance weight 11d) for adjusting the weight balance can be attached to the inside of the core member 11a.

The method for fixing the brush bristle material 11f to the core member 11a will be further described with reference to FIG. First, after aligning a plurality of brush bristle materials 11f so as to be applied to the upper end of a groove-shaped material (in this embodiment, a channel material 11h made of electrogalvanized steel sheet (SECC) having a U-shaped cross section), The core wire 11g is placed on the surface. Then, the core wire 11g is pushed into the groove of the groove mold material, and the center of the brush bristle material 11f is inserted into the groove. Then, after applying pressure from both side surfaces of the groove mold material, the brush bristle material 11f is cut into a predetermined length. The brush band 11e is formed by the above method. (See Fig. 2 (B))

Next, the brush strip 11e is screwed and fixed to the outer periphery of the core member 11a. At this time, at least the left end (work entry side end) of the vertical lines formed by the brush strip 11e wound around the core member 11a shown in FIG. The edge of the brush strip 11e is cut in advance obliquely so as to be parallel to the left end of the core member 11a shown in FIG. Moreover, in the brush strip 11e of the location cut diagonally, the brush bristle material 11f is cut diagonally in advance so that the brush bristle material 11f becomes gradually shorter toward the front end in the longitudinal direction of the brush strip 11e. In this way, the roll brush 11 (300 mm in diameter × 200 mm in length in this embodiment) is formed in which the tip of the brush bristle material 11f is exposed on the outer peripheral surface of the core member 11a. When the workpiece advances and the end of the workpiece contacts the brush bristle 11f, the brush bristle 11f has no step with respect to the end of the workpiece, so that the workpiece is further advanced without pushing back the workpiece. Can do. The brush strip 11e wound around the core member 11a may be parallel to the left and right ends of the core member at both left and right ends.

Further, by appropriately selecting the number of times the brush strip 11e is wound, the interval between the adjacent brush strips 11e can be arbitrarily set. That is, since the density of the brush bristle material 11f can be appropriately selected, the polishing force of the roll brush 11 can be arbitrarily set according to the properties of the workpiece and the purpose of polishing.

The brush bristle material 11f is preferably a resin monofilament having a circular cross section containing abrasive grains. The type of the resin can be appropriately selected in consideration of the flexibility required for the brush bristle material 11f, the holding performance of the abrasive grains, the price, and the like. For example, a polyester resin or a polyamide resin can be used. As an example of the polyester resin, polyethylene naphthalate, polyethylene terephthalate, polymethylene terephthalate, polytetramethylene terephthalate, polypropylene terephthalate, polymethylene naphthalate, polytetramethylene naphthalate, polypropylene naphthalate, or a copolymer polyester based on these , Etc. Examples of polyamide resins include nylon (“n-nylon” synthesized by polycondensation reaction and “n, m-nylon” synthesized by copolycondensation reaction), wholly aromatic polyamide (aramid), and the like. It is done. If the rigidity is strong, the polishing ability is high, but the workpiece is damaged during polishing, or the brush bristle material 11f is broken during polishing. In this embodiment, nylon 612 is used in order to have appropriate flexibility and appropriate polishing power.

Abrasive grains are alumina-based abrasive grains (alundum), silicon carbide-based abrasive grains (carborundum), zirconia alumina abrasive grains, diamond abrasive grains, CBN abrasive grains, etc., depending on the properties of the workpiece and the purpose of processing. It can be selected appropriately. In this embodiment, silicon carbide abrasive grains are used. At this time, the grain size of the abrasive grains can be appropriately selected from F60 to F240 or # 240 to # 2,000, preferably # 240 to # 500 defined by JIS R6001: 1998. When the grain size of the abrasive grains is too small, the polishing ability of the brush bristle material 11f is insufficient, and when the grain size is too large, the holding power of the abrasive grains becomes weak, and the abrasive grains fall off during polishing.

The brush bristle material 11f was prepared by mixing a predetermined amount of abrasive grains with resin constituting a monofilament and then melt spinning. Since polishing can be performed by exposing the abrasive grains from the surface, the polishing power can be increased. The amount of abrasive grains contained in the resin is 10 to 40 parts by weight, preferably 20 to 30 parts by weight, with respect to 100 parts by weight of the brush bristle material. If the amount of abrasive grains is too small, the polishing ability of the brush bristle material 11f will be insufficient, and if the amount of abrasive grains is too large, the strength of the brush bristle material 11f will be reduced and will likely break.

Further, if the wire diameter of the brush bristle material 11f is too small, the flexibility becomes too strong and the polishing power becomes insufficient, and if the wire diameter is too large, the flexibility of the brush hair material 11f becomes too low and easily breaks. For this reason, the wire diameter of the brush bristle material 11f is preferably 0.3 mm to 2.0 mm, and more preferably 0.4 mm to 1.0 mm.

The mechanism for rotating the roll brush 11 connects the motor 12, the rotation shaft 11 b of the roll brush 11, the pulley 13 provided on the rotation shaft of the motor 12, and the pulleys 13, and rotates the motor 12. A belt 14 conducting to the roll brush 11. A pulley 13 is fixed to a rotating shaft 11b fixed to the core member 11a, and the rotating shaft 11b is rotatably supported on a pedestal (not shown) in the housing 70 by a bearing (not shown). . The motor 12 is also fixed to the gantry, and a pulley 13 is fixed to the rotating shaft of the motor 12. A belt 14 is bridged between a pulley 13 fixed to the rotating shaft 11 b of the roll brush 11 and a pulley 13 fixed to the rotating shaft of the motor 12. When the motor 12 is operated, the belt 14 is rolled through the belt 14. The brush 11 can be rotated about the rotation shaft 11b.

The frame on which the polishing mechanism 10 is installed is connected to a cutting amount adjusting mechanism 40 for moving the roll brush 11 in the left-right direction in FIG. By moving the roll brush 11 in the left-right direction, the cut amount (amount of pressing the brush bristle material 11f against the workpiece) can be changed. The cut amount adjusting mechanism 40 of this embodiment includes a ball screw mechanism and is connected to a cut amount adjusting handle 41 provided outside the housing 70. By rotating the cut amount adjusting handle 41, the frame can be moved in the left-right direction in the figure, and the cut amount can be arbitrarily set.

The workpiece rotating mechanism 20 includes a cylindrical workpiece rotating wheel 21 and a mechanism for rotating the workpiece rotating wheel 21. As shown in FIG. 3, the work rotating wheel 21 includes a cylindrical core member 21a, a rotary shaft 21b fixed to the axis of the core member 21a, and a rotation transmission fixed to the outer peripheral surface of the core member 21a. And a member 21e. Note that the length of the work rotating wheel 21 (left-right direction in FIG. 1B) was substantially the same as the length of the roll brush 11.

The core member 21a has a cylindrical shape, and a boss member 21c is fixed at the center of the longitudinal section and at the center of the circular section. The end of the rotating shaft 21b is fixed to the boss member 21c. With such a structure, the weight of the work rotating wheel 21 is reduced, so that the motor 22 having a small output can be used.
In addition, only one end side of the rotating shaft 21b protrudes from the core member 21a. Although the work rotating wheel 21 is pivotally supported by the protruding portion of the rotating shaft 21b, since the core member 21a is light, it can be supported only on one side of the work rotating wheel 21.

Further, when the workpiece rotating wheel 21 is shaken, the weight (balance weight 21d) for adjusting the weight balance can be attached inside the core member 21a.

A rotation transmission member 21e is fixed to the outer periphery of the work rotating wheel 21. By the rotation transmitting member 21e, the rotational force of the workpiece rotating wheel 21 is conducted to the workpiece, and the workpiece rotates. The rotation transmitting member 21e needs a high friction coefficient in order to efficiently transmit the rotation of the workpiece rotating wheel 21 to the workpiece. Therefore, rubber is generally used. The centerless polishing apparatus of this embodiment can conduct the rotation of the work rotating wheel to the work well without using a material having a very high coefficient of friction such as rubber. In the present embodiment, a non-woven fabric (specifically, a feather cloth impregnated with abrasive grains (eg, about # 2,500) called a grid buff) is used for the rotation transmitting member 21e. When the rotation transmission member 21e made of rubber is used, when replacing the rotation transmission member 21e deteriorated with use, it is necessary to replace the rubber by disappearing or dissolving it with a solvent. Since the rotation transmission member 21e can be easily replaced by using a non-woven fabric as in the present embodiment, maintenance is improved.

The mechanism for rotating the work rotating wheel 21 includes a motor 22, a rotation shaft 21 b of the work rotating wheel 21, a pulley 23 provided on the rotation shaft of the motor 22, and the pulleys 23. And a belt 24 that conducts the rotation to the work rotating wheel 21. A pulley 23 is fixed to a rotating shaft 21b fixed to the core member 21a, and the rotating shaft 21b is rotatably supported by a base (not shown) in the housing 70 by a bearing (not shown). Yes. At this time, a gap is formed between the roll brush 11 and the work rotating wheel 21. The motor 22 is also fixed to the gantry, and a pulley 23 is fixed to the rotating shaft of the motor 22. A belt 24 is bridged between a pulley 23 fixed to the rotating shaft 21b of the

work rotating wheel

21 and 23 fixed to the rotating shaft of the motor 22, and the work is passed through the belt 24 by operating the motor 22. The rotating wheel 21 can be rotated.

The base on which the work rotation mechanism 20 is installed is connected to a gap adjustment mechanism 50 for moving the work rotation wheel 21 in the left-right direction in FIG. By moving the work rotating wheel 21 in the left-right direction, the distance from the roll brush 11 can be changed. The gap adjustment mechanism 50 of this embodiment includes a ball screw mechanism and is connected to a gap adjustment handle 51 provided outside the housing 70. By rotating the gap adjusting handle 51, the frame can be moved in the left-right direction in the figure, and the interval between the roll brush 11 and the work rotating wheel 21 can be arbitrarily set.

The work placing member 30 is a long and thin flat plate, and is erected between the roll brush 11 and the work rotating wheel 21. The upper end of the longitudinal section perpendicular to the longitudinal direction (working direction of the work) of the work placing member 30 on which the work is placed during polishing is horizontal. In general, the upper end of the workpiece placement member 30 as viewed from the side is such that the center of gravity of the workpiece is directed to the right (that is, the direction of the workpiece rotating wheel 21) when the workpiece is placed as shown in FIG. Leaning on. When a metal wire having high rigidity is used as the brush bristle material 11f, the tip of the brush bristle material 11f bites into the work during polishing, or the brush bristle material 11f hits the work, so that the rotation of the work is hindered. Therefore, in order to sufficiently transmit the rotational force of the work rotating wheel 21 to the work, the work placing member 30 is tilted and the work is pressed against the work rotating wheel 21 by its own weight. The force that sufficiently presses the work against the work rotating wheel 21 is important to balance the angle at which the upper end of the work placing member 30 is inclined and the diameter of the work. Therefore, when polishing a workpiece having a plurality of diameters, it is necessary to replace the workpiece placing member 30 every time according to the workpiece diameter. Since the bristle material 11f of the roll brush 11 of this embodiment is a monofilament made of nylon and containing abrasive grains, it has both a sufficient polishing force and flexibility to polish a workpiece. Therefore, the rotation of the workpiece is not hindered by the biting of the tip of the brush bristle material 11f into the workpiece, the hitting of the brush bristle material 11f against the workpiece, or the like. Therefore, since the rotation of the workpiece is not hindered by the roll brush 11, it is not necessary to incline the upper end of the workpiece placing member 30 toward the workpiece rotating wheel.

The upper end position (height position) of the workpiece placement member 30 was the same as the axis of the roll brush 11. However, if the diameter of the workpiece is too large, the opportunity for the brush bristle material 11f to come into contact with the workpiece is reduced, so that the polishing force is reduced. In such a case (for example, in the case of this embodiment, φ30 mm or more), the height position of the workpiece mounting member 30 is adjusted so that the height position of the center point of the workpiece is the same as the axis of the roll brush 11. Is desirable.

The work rotating wheel 21 and the roll brush 11 are disposed so as to be inclined downward in the forward direction of the work within a range of 1 to 5 °, for example. The work advances by tilting the work rotating wheel 21. If the tilt angles of the work rotating wheel 21 and the roll brush 11 are too small, the work is difficult to advance, the work advance speed is not constant, and the finish may be uneven. If the inclination angle is too large, the work advance speed becomes higher than necessary, which may result in insufficient polishing.

The length of the workpiece placing member 30 (the length in the left-right direction in FIG. 1B) is not particularly limited as long as the workpiece can be placed during polishing.

The workpiece transfer mechanism 60 includes a workpiece loading mechanism 61 disposed on the left side of the workpiece mounting member 30 in FIG. 1B and a workpiece unloading mechanism 62 disposed on the right side of the workpiece mounting member 30. The workpiece loading mechanism 61 includes a workpiece loading feeder 61a (vibrating feeder in the present embodiment) and a workpiece loading member 61b (this embodiment) placed on the workpiece loading feeder 61a and adjacent to the left side of the workpiece loading member 30. In the form, it is comprised with the equilateral mountain-shaped steel (angle steel) arrange | positioned so that a cross section may become V shape. After the workpiece is placed on the workpiece carry-in feeder 61a, when the workpiece carry-in feeder 61a is operated, the workpiece moves forward in the right direction. The workpiece continues to move forward by the workpiece carry-in member 61b without causing lateral movement in the forward direction, and is placed on the workpiece placement member 30.

The workpiece unloading mechanism 62 is mounted on the workpiece unloading feeder 62a (vibrating feeder in this embodiment) and the workpiece unloading feeder 62a and adjacent to the right side of the workpiece loading member 30 (the book unloading member 62b). In the embodiment, it is composed of an equilateral angle steel (angle steel) arranged so that the cross section is V-shaped. The workpiece that has moved forward on the workpiece placement member 30 and reached the end is transferred to the workpiece carry-out member 62b, and continues to advance further by the workpiece carry-out feeder 62a. The workpiece can be advanced by the workpiece carry-out member 62b without causing lateral movement in the forward direction. If the work can be sufficiently advanced on the work carry-out member 62b by only the rotational force of the work rotating wheel 21 and can be carried out from a polishing chamber R described later, the work carry-out feeder 62a may not be used.

Work guide members 63 are arranged in the vicinity of both ends of the work placement member 30. The work guide member 63 is a member for adjusting the placement position of the work placement member 30 of the work. In the present embodiment, the two flat plates are erected so as to be objects with the workpiece placement member 30 interposed therebetween. The distance between the flat plates (vertical direction in FIG. 1B) can be adjusted according to the diameter of the workpiece by, for example, a ball screw mechanism. The workpiece is placed at the center of the workpiece placement member 30 by the workpiece guide member 63.

The housing 70 includes an upper casing 71, a lower casing 72, and a control unit casing 73. The upper casing 71 and the lower casing 72 form a box. The housing 70 accommodates the polishing mechanism 10, the work rotating mechanism 20, the work placing member 30, the cut amount adjusting mechanism 40, and the gap adjusting mechanism 50. A polishing chamber R is formed inside the housing 70. ing. The upper casing 71 can be opened and closed with a hinge H as a fulcrum. Further, the upper casing 71 is provided with a window portion 71a which is a transparent plate, and the workpiece being polished can be confirmed from the window portion 71a.

A carry-in port 74 is opened on the left side surface of the casing 70, and the work carry-in member 61b passes therethrough. Further, a carry-out port 75 is opened on the right side surface of the housing 70, and the work carry-out member 62b passes therethrough.

A coolant liquid circulation mechanism 80 is connected to the polishing chamber R. When polishing is performed, a coolant liquid (in this embodiment, a soluble solution type water-soluble grinding liquid) for cooling the work generated by the polishing is sprayed from a coolant liquid spray nozzle (not shown). The coolant liquid circulation mechanism 80 can collect the coolant liquid injected from the coolant liquid injection nozzle and send it again to the coolant liquid injection nozzle.

When the brush bristle material 11f is a metal wire, the brush bristle material 11f is corroded by the coolant liquid. Since this corrosion is transferred to the workpiece during polishing, the quality of the workpiece is degraded. Further, since the strength of the brush bristle material 11f is reduced by corrosion, the brush bristle material 11f is broken during polishing. If the brush bristle material 11f breaks during polishing, the polishing force of the roll brush 11 changes, so it is difficult to control the finished quality of the workpiece. With the roll brush of the present invention, the work can be satisfactorily polished without causing these problems.

In addition, when many particles, such as a cutting powder of a workpiece | work, are contained in the coolant liquid injected from the coolant liquid injection nozzle, the particles contained in the coolant liquid are removed between the polishing chamber R and the coolant liquid circulation mechanism 80. A filtration mechanism (not shown) may be arranged.

When the coolant liquid comes into contact with the roll brush 11, the coolant liquid becomes mist and fills the polishing chamber R. A mist collector (not shown) for removing the mist-like coolant may be connected to the polishing chamber R.

The control unit 90 can store polishing conditions, output signals for operating each mechanism based on the stored polishing conditions, and the like. For example, a motion controller such as a programmable logic controller (PLC) or a digital signal processor (DSP), a personal computer, a multi-function mobile terminal, a multi-function mobile phone, or the like can be used. In the present embodiment, the controller 91 includes a controller 91 that stores polishing conditions and outputs a signal for operating each mechanism, and an operation unit 92 that performs ON / OFF operation of the centerless polishing apparatus 01. The controller 91 is housed in the controller casing 73.

Next, a polishing method using the centerless polishing apparatus 01 of this embodiment will be described. In this embodiment, a case where a round bar of carbon steel of φ20 × 40 mm (material is S45C defined by JIS G4051) is continuously polished will be described as an example.

(Polishing method; operation preparation process)
Prior to polishing, the following operation preparation process is performed. First, the following polishing conditions are input to the control unit 91 and stored.
<Polishing conditions>
Rotating speed of rotating work wheel Feeding speed of work in work transfer mechanism

Next, the upper casing 71 is opened and the position of each mechanism is adjusted. First, the height position of the workpiece carry-in member 61b is adjusted so that the lower end position of the workpiece placed on the workpiece carry-in member 61b and the height position of the workpiece placement member 30 are substantially the same. Similarly, the height position of the workpiece carry-out member 62b is adjusted so that the lower end position of the workpiece placed on the workpiece carry-out member 62b and the height position of the workpiece placement member 30 are substantially the same.

Next, the distance between the work guide members 63 arranged in the vicinity of both ends of the work placement member 30 is adjusted so as to be the diameter of the work.

Next, the clearance adjustment handle 51 is turned to move the work rotating wheel 21 in the left-right direction in FIG. 1A so that the interval (gap) between the roll brush 11 and the work rotating wheel 21 is adjusted to the diameter of the work. .

Next, the cutting amount adjusting handle 41 is turned so that the roll brush 11 is moved to the left in FIG. 1A by the target cutting amount (1.0 mm in this embodiment), that is, from the work rotating wheel 21 by the cutting amount. Move in the direction of narrowing the interval.

Next, the amount of the coolant liquid in the coolant liquid circulation mechanism 80 is adjusted to be a predetermined amount. Further, the direction of the coolant injection nozzle arranged in the polishing chamber R is adjusted.

When the above adjustment is completed, the upper casing 71 is closed and the operation preparation process is completed. Next, the polishing process will be described.

(Polishing method; polishing step)
When the “operation button” of the operation unit 92 is turned ON, the motor 12 is activated and the roll brush 11 is rotated. In the present embodiment, the roll brush 11 is rotated at 2,000 min ⁻¹ .

Next, the motor 22 operates based on the polishing conditions input to the control unit 91, and the work rotating wheel 21 rotates. The forward speed and the rotational speed of the work when the work passes between the roll brush 11 and the work rotating wheel 21 are determined by the rotational speed of the work rotating wheel 21. That is, the workpiece processing speed can be adjusted by the rotation speed of the workpiece rotating wheel 21.

Next, the coolant circulation mechanism 80 operates to inject and circulate the coolant.

Next, the workpiece carry-in feeder 61a and the workpiece carry-out feeder 62a are operated. The operating conditions (workpiece advance speed) of the work carry-in feeder 61a and the work carry-out feeder 62a operate based on the "work feed speed in the work transport mechanism" input to the control unit 91.

When the work carry-in feeder 61a is activated, the work is placed on the work carry-in member 61b. The workpiece moves forward in the right direction in FIG. 1B due to the vibration of the workpiece carry-in feeder 61 a and is carried into the polishing chamber R through the carry-in port 74. Then, the work reaches the right end of the work carry-in member 61b. The workpiece is transferred to the workpiece placement member 30 after the position in the vertical direction of the drawing is adjusted by the workpiece guide member 63.

The work rotates in the reverse direction to the work rotating wheel 21 by the rotation of the work rotating wheel 21. Moreover, since a workpiece | work contacts with the bristle material 11f of the rotating roll brush 11, an outer peripheral surface and an edge part are grind | polished.

Since the workpiece placement member 30 is inclined downward in the workpiece traveling direction (the right direction in FIG. 1B), the workpiece further advances in the right direction while being polished. The work that has reached the right end of the work placement member 30 is transferred to the work carry-out member 62b after the position in the vertical direction in FIG. The transposed work advances forward in the right direction by the vibration of the work carry-out feeder 62a, and is carried out of the polishing chamber R through the carry-out port 75.

The polishing of the workpiece is completed through the above steps. When the workpieces are continuously placed on the workpiece carry-in member 61b, a plurality of workpieces can be polished continuously.

(Example)
The result of polishing using the centerless polishing apparatus of this embodiment will be described as an example. In the example, the brush bristle material 11f is made of nylon 612 having a diameter of φ0.55 mm and containing abrasive grains (particle size; F60 to 2000) in an amount of 10 to 40 wt% with respect to the total amount of the brush bristle material. Cylindrical workpieces of different types (work A; S45C unhardened product specified by JIS G4051, φ20 × 40mm work B; SCM430 hardened product specified by JIS G4053, φ10 × 30mm) Processing was performed under the following conditions for the purpose of smoothing the surface and rounding the edges (R attachment).
Roll brush rotation speed: 2,000 min ^-1
Cutting depth: 1.0mm
Work feed speed: 0.5 and 1.0 m / min

Further, as a comparative example, the brush bristle material is a metal wire (hard steel wire with a diameter of 0.175 mm; SWRH70 as defined in JIS G3506, stainless wire with a diameter of 0.10 mm; SUS304 and SUS430 as defined in JIS G3409. ) Was processed in the same manner.

For the polished workpiece A and workpiece B, the outer peripheral surface of the outer peripheral surface is measured with a surface roughness Ra (JIS B0601: 1994) using a surface roughness contour measuring instrument (manufactured by Tokyo Seimitsu Co., Ltd .; surfcom 1500DX). Evaluation was made by measuring the presence or absence of burrs and sagging at the end and the radial dimension (R dimension) with a shape measuring instrument (Tokyo Seimitsu Co., Ltd .; controlcord 2600E). In addition, the workpiece | work A and the workpiece | work B grind | polished 3 each on each condition, and calculated and evaluated the average value of the measurement result.

Table 1 shows the results of polishing. Hereinafter, the results will be described using Table 1, FIG. 4 and FIG.

1. Evaluation of the outer peripheral surface of the workpiece (see Table 1 and Fig. 4)
When the nylon filament monofilament is used as a brush bristle material, when the workpiece A having low hardness is polished, the surface roughness Ra after polishing is smaller than that before polishing under any conditions (Examples 1 to 11). It can be seen that the outer peripheral surface of the workpiece A is smoothed by polishing. Further, when the workpiece B having high hardness was polished, there was almost no change in the surface roughness Ra before and after polishing (Examples 12 to 13)). That is, it can be seen that under this polishing condition, the ability to polish the outer peripheral surface of the workpiece B is insufficient. However, as is clear from the results of Examples 1 to 11, it can be easily inferred that the work B can be satisfactorily polished by appropriately selecting the grain size and content of the abrasive grains.

When the workpiece was polished using a highly rigid metal wire (hard steel wire) as a bristle material, the surface roughness Ra after polishing was higher than that before polishing (Comparative Examples 1 to 4). That is, it can be seen that the outer peripheral surface was damaged by polishing. This wire has no polishing ability other than the tip and has high rigidity. Therefore, even if the surface of the workpiece is polished by the tip of the brush bristle material, the side surface of the brush bristle material is struck against the work and the work surface is damaged. Further, when the workpiece was polished using a metal wire (stainless wire) having low rigidity as a brush bristle material, there was almost no change in the surface roughness Ra before and after polishing (Comparative Examples 5 to 6). This wire has no polishing ability other than the tip, but has low polishing ability because of its low rigidity. Therefore, the workpiece cannot be polished.

Further, in Example 1 and Comparative Example 1, a change in the diameter of the workpiece due to polishing was measured. In the case of Example 1, it was −1.5 μm, and in the case of Comparative Example 1, it was −3.8 μm. As a result, it was suggested that when a metal wire is a brush bristle material, it is difficult to manage the dimensions of the workpiece.

2. Evaluation of workpiece end face (See Table 1 and Fig. 5)
There were burrs at the end of the workpiece before polishing. When a nylon filament monofilament was used as a brush bristle material, there were no burrs at the end of the polished workpiece, and no edge sagging occurred due to polishing. And the edge part of this workpiece | work formed the R shape where the curvature of the vertical axis direction and horizontal axis direction in FIG. 7 was uniform.
When a workpiece was polished using a metal wire (hard steel wire) having high rigidity as a brush bristle material, secondary burrs were generated by the polishing (Comparative Examples 1 and 2). Since the hardness of the wire of the hard steel wire rod is high, it is presumed that secondary burr was generated due to plastic deformation of the workpiece by hitting the brush bristle material against the workpiece during polishing. Further, when the workpiece B was polished using this wire as a brush bristle material, edge sagging occurred due to the polishing (Comparative Examples 3 to 4). This is presumed that the workpiece B was plastically deformed by polishing in the same manner as in the case of the workpiece A. For example, when the workpiece is a hydraulic part, there is a problem of oil leakage if there is edge leakage.
When the workpiece was polished using a metal wire (stainless wire) having low rigidity as a brush bristle material, there was almost no change in the surface roughness Ra before and after polishing (Comparative Examples 5 to 6). This wire has no polishing ability other than the tip, but has low polishing ability because of its low rigidity. Therefore, the workpiece cannot be polished.

(Second embodiment)
Next, another embodiment of the centerless polishing apparatus of the present invention will be described as a second embodiment with reference to FIG. The centerless polishing apparatus according to the second embodiment is a type in which a plurality of polishing units including a polishing mechanism and a workpiece rotating mechanism are connected in series. In the present embodiment, a case where two polishing units are connected will be described. In the following description, only differences from the centerless polishing apparatus of the first embodiment will be described. In the following description, the same reference numerals as those in the first embodiment are partly used for convenience.

The centerless polishing apparatus 101 according to the second embodiment includes a first polishing mechanism 110a, a first workpiece rotating mechanism 120a, a second polishing mechanism 110b, a second workpiece rotating mechanism 120b, a workpiece placing member 130, One cut amount adjustment mechanism 140a, second cut amount adjustment mechanism 140b, first gap adjustment mechanism 150a, second gap adjustment mechanism 150b, work transfer mechanism 160, casing 170, coolant fluid circulation mechanism 180, , And control means 190.

Both the first polishing mechanism 110a and the second polishing mechanism 110b have the same configuration as the polishing mechanism 10 in the first embodiment.

Also, a first cut amount adjusting mechanism 140a is connected to the first polishing mechanism 110a. A second cut amount adjusting mechanism 140b is connected to the second polishing mechanism 110b. Both the first cut amount adjusting mechanism 140a and the second cut amount adjusting mechanism 140b have the same configuration as the cut amount adjusting mechanism 40 in the first embodiment. By rotating the first cut amount adjusting handle 141a and the second cut amount adjusting handle 141b provided on the outside of the casing 170 and moving the respective roll brushes 11 in the left-right direction in FIG. The cutting amount of the brush 11 can be adjusted.

Both the first work rotation mechanism 120a and the second work rotation mechanism 120b have the same configuration as the work rotation mechanism 20 in the first embodiment.

Further, a first gap adjusting mechanism 150a is connected to the first workpiece rotating mechanism 120a. A second gap adjusting mechanism 150b is connected to the second workpiece rotating mechanism 120b. Both the first gap adjustment mechanism 150a and the second gap adjustment mechanism 150b have the same configuration as the gap adjustment mechanism 50 in the first embodiment. By rotating the first clearance adjustment handle 151a and the second clearance adjustment handle 151b provided outside the housing 170 and moving the respective work rotating wheels 21 to the left and right in FIG. 11 and the work rotating wheel 21 can be adjusted.

The first polishing mechanism 110a and the first workpiece rotation mechanism 120a (first polishing unit U1) and the second polishing mechanism 110b and the second workpiece rotation mechanism 120b (second polishing unit U2) are on the same line. The workpiece placing members 130 are erected so as to be connected to each other and to connect the respective gaps. The workpiece placing member 130 is a long and thin flat plate, like the workpiece placing member 30 in the first embodiment. Further, the upper end surface of the workpiece placing member 130 is a surface on which the workpiece is placed, and the shape thereof is not particularly limited. In the present embodiment, the roll brush 11 and the work rotating wheel 21 are the same as in the first embodiment. It was level between.

As in the first embodiment, the work rotating wheel 21 and the roll brush 11 are disposed, for example, in a range of 1 to 5 ° and tilted downward toward the traveling direction of the work. The work advances by tilting the work rotating wheel 21. If the tilt angles of the work rotating wheel 21 and the roll brush 11 are too small, the work is difficult to advance, the work advance speed is not constant, and the finish may be uneven. If the inclination angle is too large, the work advance speed becomes higher than necessary, which may result in insufficient polishing.

The positional relationship among the first polishing mechanism 110a, the first workpiece rotating mechanism 120a, the second polishing mechanism 110b, and the second workpiece rotating mechanism 120b is not particularly limited, but in this embodiment, as shown in FIG. The second workpiece rotating mechanism 120b is arranged on the right side (workpiece traveling direction side) of the one polishing mechanism 110a, and the second polishing mechanism 110b is arranged on the right side of the first workpiece rotating mechanism 120a.

The work transport mechanism 160 has the same configuration as that of the first embodiment. In other words, the workpiece loading mechanism 61 disposed on the left side of the workpiece placement member 130 and the workpiece carry-out mechanism 62 disposed on the right side of the workpiece placement member 130 are provided. Further, the both ends of the roll brush 11 of the first polishing mechanism 110a and the work rotating wheel 21 of the first work rotating mechanism 120a, the roll brush 11 of the second polishing mechanism 110b, and the work rotating wheel 21 of the second work rotating mechanism 120b. In the vicinity of both ends, work guide members 63 similar to those of the first embodiment are arranged.

The housing 170 includes a first polishing mechanism 110a, a first workpiece rotating mechanism 120a, a second polishing mechanism 110b, a second workpiece rotating mechanism 120b, a workpiece placing member 130, and a first cut amount adjusting mechanism 140a. The second cut amount adjusting mechanism 140b, the first gap adjusting mechanism 150a, and the second gap adjusting mechanism 150b are enclosed, and a polishing chamber R is formed therein. The housing 170 can be opened and closed with a hinge H provided on the ceiling as a fulcrum. Further, a window portion 171a, which is a transparent plate, is provided on the ceiling of the casing 170, and the workpiece being polished can be confirmed from the window portion 171a.

A carry-in port 174 is opened on the left side surface of the casing 170, and the work carry-in member 61b passes therethrough. Further, a carry-out port 175 is opened on the right side surface of the casing 170, and the work carry-out member 62b passes therethrough.

In the polishing chamber R, a coolant circulation mechanism 180 is connected as in the first embodiment. In addition, when many particles, such as a cutting powder of a workpiece | work, are contained in the coolant liquid injected from the coolant liquid injection nozzle, the particles contained in the coolant liquid are removed between the polishing chamber R and the coolant liquid circulation mechanism 80. A filtration mechanism (not shown) may be arranged.

When the coolant comes into contact with the roll brush 11, a mist of coolant is generated. A mist collector (not shown) for removing the mist-like coolant may be connected to the polishing chamber R.

The control means 190 can perform storage of polishing conditions, output of signals for operating each mechanism based on the stored polishing conditions, and the like. As in the first embodiment, this embodiment includes a control unit 191 that stores polishing conditions and outputs signals for operating each mechanism, and an operation unit 192 that turns on and off the operation of the centerless polishing apparatus 101. .

The outer periphery of the workpiece is polished through an operation preparation process and a polishing process as in the first embodiment. In the centerless polishing apparatus 101 of the second embodiment, the work carried into the polishing R from the carry-in port 174 is polished by the first polishing unit U1 and the second polishing unit U2, and then moved outside the polishing R from the carry-out port 175. It is carried out. Thus, since the workpiece | work is grind | polished by the 1st grinding | polishing unit U1 and the 2nd grinding | polishing unit U2, the advance speed of a workpiece | work can be made quick and grinding | polishing time can be shortened.

Also, the rotation direction of the first polishing mechanism 110a and the first workpiece rotation mechanism 120a and the rotation direction of the second polishing mechanism 110b and the second workpiece rotation mechanism 120b may be reversed. For example, when polishing a workpiece (see the illustration in FIG. 7) that has been subjected to processing such as notch processing, hole processing, boss processing, etc., it is difficult to evenly polish the processed end, By making the rotation direction reverse, the processed end can be evenly polished.

These members obtained in the present invention have no scratches (polishing marks), small surface roughness, high roundness, and small dimensional tolerances. For example, rotating shafts such as motors and engines, pistons, gold It can be suitably used for polishing a member that requires high dimensional tolerance and smoothness such as a set pin such as a mold.

This application is based on Japanese Patent Application No. 2013-049233 filed on March 12, 2013 in Japan, the contents of which form part of the present application.
The present invention will also be more fully understood from the detailed description herein. However, the detailed description and specific examples are preferred embodiments of the present invention and are described for illustrative purposes only. This is because various changes and modifications will be apparent to those skilled in the art from this detailed description.
The applicant does not intend to contribute any of the described embodiments to the public, and the disclosed modifications and alternatives that may not be included in the scope of the claims are equivalent. It is part of the invention under discussion.
In this specification or in the claims, the use of nouns and similar directives should be interpreted to include both the singular and the plural unless specifically stated otherwise or clearly denied by context. The use of any examples or exemplary terms provided herein (eg, “etc.”) is merely intended to facilitate the description of the invention and is not specifically recited in the claims. As long as it does not limit the scope of the present invention.

01 Centerless polishing machine (first embodiment)
DESCRIPTION OF SYMBOLS 10 Polishing mechanism 11 Roll brush 11a Core member 11b Rotating shaft 11c Boss member

11d Balance weight

11e Brush belt 11f Brush bristle material 11g Channel material 11h Core wire 12 Motor 13 Pulley 14 Belt 20 Work rotating mechanism 21 Work rotating wheel 21a Core member 21b Rotating shaft 21c Boss member 21d Balance weight 21e Rotation transmission member 22 Motor 23 Pulley 24 Belt 30 Work placement member 40 Cut amount adjusting mechanism 41 Cut amount adjusting handle 50 Clearance adjusting mechanism 51 Clearance adjusting handle 60 Work transport mechanism 61 Work loading mechanism 61a Work loading Feeder 61b Workpiece carrying member 62 Workpiece carrying Mechanism 62a Work carry-out feeder 62b Work carry-out member 63 Work guide member 70 Case 71 Upper casing 71a Window portion 72 Lower casing 73 Control unit casing 74 Carry-in port 75 Carry-out port 80 Coolant liquid circulation mechanism 90 Control unit 91 Control unit 92 Operation unit 101 Centerless polishing device (second embodiment)
110a First polishing mechanism 110b Second polishing mechanism 120a First workpiece rotation mechanism 120b Second workpiece rotation mechanism 130 Workpiece mounting member 140a First cutting amount adjustment mechanism 141a First cutting amount adjustment handle 140b Second cutting amount adjustment mechanism 141b First Double cut amount adjustment handle 150a First gap adjustment mechanism 151a First gap adjustment handle 150b Second gap adjustment mechanism 151b Second gap adjustment handle 160 Work transfer mechanism 170 Housing 171a Window part 174 Carry-in port 175 Carry-out port 180 Coolant liquid circulation mechanism 190 Control means 191 Control unit 192 Operation unit H Hinge R Polishing chamber U1 First polishing unit U2 Second polishing unit

Claims

A centerless polishing apparatus for polishing an outer peripheral surface and an end of a rod-shaped or cylindrical workpiece,
The centerless polishing apparatus includes a roll brush in which tips of a plurality of brush bristle materials are exposed on the outer peripheral surface,
A work rotating wheel provided with a rotation transmitting member on the outer peripheral surface;
A workpiece placement member erected between the roll brush and the workpiece rotating wheel;
With
The brush bristle material is a monofilament made of a nylon resin containing 10 to 40 parts by weight of abrasive grains having a particle size of F60 to F240 or # 240 to # 2,000 with respect to 100 parts by weight of the entire brush bristle material. A centerless polishing apparatus.
2. The centerless polishing apparatus according to claim 1, wherein the workpiece mounting member is plate-shaped, and an upper end of a longitudinal section perpendicular to the longitudinal direction of the workpiece mounting member is horizontal.
The roll brush is arranged by inserting one end of a plurality of brush bristle materials cut into a predetermined length into the groove of a long base having a U-shaped groove in cross section, The centerless polishing apparatus according to claim 1, wherein a brush strip formed by fixing a material in the groove is wound around an outer periphery of a cylindrical brush base material.
The centerless polishing apparatus according to claim 1, wherein the rotation transmitting member is a non-woven fabric.
A workpiece transfer mechanism comprising: a workpiece carry-in mechanism that advances and conveys the workpiece to the workpiece placement member; and a workpiece carry-out mechanism that carries the workpiece that has passed through the workpiece placement member out of the centerless polishing apparatus,
The workpiece loading mechanism includes a workpiece loading feeder that generates a force for advancing the workpiece and a workpiece loading member having a V-shaped groove, one end of which is the side on which the workpiece loading feeder is disposed. A workpiece carrying member disposed on the end side of the
The work unloading mechanism is a work unloading member having a V-shaped groove, and includes a work unloading member disposed so as to be positioned in the vicinity of the other end of the work placing member. The centerless polishing apparatus according to 1.
The centerless polishing apparatus according to claim 5, wherein a work guide member for placing a work in the center of the work placing member is provided on an end side of the work carrying member.
A polishing unit composed of a polishing mechanism including the roll brush and a mechanism for rotating the roll brush, and a workpiece rotating mechanism including the workpiece rotating wheel and a mechanism for rotating the workpiece rotating wheel, is provided in the forward direction of the workpiece. The centerless polishing apparatus according to claim 1, wherein two or more are connected in series.
A polishing method for polishing an outer peripheral surface and an end of a rod-shaped or cylindrical workpiece using the centerless polishing apparatus according to any one of claims 1 to 7,
Rotating the roll brush;
Rotating the work rotating wheel in the same direction as the rotation direction of the roll brush;
Placing one end of the workpiece on the workpiece placing member;
Transmitting the rotation of the work rotating wheel to the work via the rotation transmission member, rotating the work, and advancing the work;
The advancing work comes into contact with the roll brush and polishes the outer peripheral surface and the end of the work, and
The polishing method further comprising the step of adjusting the forward speed of the work by adjusting the rotational speed of the work rotating wheel.