EP3231556B1 - Burr removal device and burr removal method - Google Patents

Burr removal device and burr removal method Download PDF

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Publication number
EP3231556B1
EP3231556B1 EP15867853.2A EP15867853A EP3231556B1 EP 3231556 B1 EP3231556 B1 EP 3231556B1 EP 15867853 A EP15867853 A EP 15867853A EP 3231556 B1 EP3231556 B1 EP 3231556B1
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EP
European Patent Office
Prior art keywords
processed
objects
abrasive grains
burr removal
face
Prior art date
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EP15867853.2A
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German (de)
English (en)
French (fr)
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EP3231556A1 (en
EP3231556A4 (en
Inventor
Kazuyoshi Maeda
Norihito Shibuya
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Sintokogio Ltd
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Sintokogio Ltd
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Publication of EP3231556A1 publication Critical patent/EP3231556A1/en
Publication of EP3231556A4 publication Critical patent/EP3231556A4/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
    • B24C1/083—Deburring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/18—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions
    • B24C3/26—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions the work being supported by barrel cages, i.e. tumblers; Gimbal mountings therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/32—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C5/00—Devices or accessories for generating abrasive blasts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
    • B24C9/003—Removing abrasive powder out of the blasting machine

Definitions

  • the present disclosure relates to a burr removal device for removing burrs of objects to be processed and a burr removal method for removing burrs of objects to be processed.
  • Electronic components are widely used in many electronic devices, such as a smart phone, a tablet terminal, and a portable music player. Particularly in recent years, smaller electronic components are desired to reduce the size of the electronic devices.
  • These electronic components are obtained in such a manner that raw material powders as hard brittle materials, such as ceramics or magnetic material, are molded by a press molding method, a doctor blade method, an injection molding method, or the like, and are then sintered.
  • the burrs cause such as, for example, performance degradation of an electronic device due to the falling of a burr in a mounting process with an automatic mounting machine, or defective mounting resulting from the burrs, or the like. Therefore, the removal of burrs is carried out before mounting.
  • Patent Literature 1 discloses a method for removing burrs by a wet barrel polishing method.
  • Patent Literature 1 discloses a method in which paste containing raw material is molded into a sheet shape to create a green sheet, and in which burrs of a green chip, which is obtained by cutting the green sheet, are removed by performing wet barrel polishing.
  • the wet barrel polishing method is a polishing method having relatively high polishing ability, and hence, the molded body is excessively polished depending on the strength of the molded body, which affects the dimensional accuracy of the electronic components. Further, in the wet barrel polishing method, the processing of wastewater generated by the polishing, the drying of the molded body after the polishing, and the like, are required, which increases the manufacturing cost.
  • a method using an air blast apparatus can be considered (for example, described in paragraph 0002 of Patent Literature 2).
  • the air blast apparatus abrasive grains are injected to a workpiece with compressed air having very high pressure, for example 0.2 MPa or more, to form a gas-solid two-phase flow.
  • the method using the air blast apparatus has polishing power higher than that of the above-described barrel polishing method, and hence, may cause a failure, such as cracking and chipping of the workpiece depending on the strength of the workpiece.
  • the blasting apparatus includes an enclosure in which a blasting chamber is defined; a nozzle assembly which is disposed in the blasting chamber to blast the workpieces by discharging blast particles thereto; a classifier unit for separating reusable blast particles from a mixture of the blast particles discharged from the nozzle assembly and dust particles resulting from the blasting; a reservoir unit for holding the blast particles to be supplied to the nozzle assembly; and a collector unit for drawing in under suction and thereby collecting the remaining mixture, from which the reusable blast particles have already been separated.
  • the blasting chamber includes at least one or more hollow tumblers which are adapted to be loaded with the workpieces and disposed to be rotatable about the center axis. The tumbler has one end closed to form a bottom with the other end opened to form an opening opposite to the bottom; a plurality of through holes on the circumferential wall surface thereof; and a polygonal or circular cross section in parallel to the opening.
  • US 3 824 739 A relates to a method and apparatus for continuously removing burrs from objects.
  • the objects are subjected to a blast of granular shot, which is re-cycled after separating-out the removed burrs and is led back to a storage hopper, the shot being continuously insulated thermally from the ambient air and being cooled, simultaneously with the objects by a cold gas in the liquefied form or in course of vaporization.
  • the apparatus comprises a shot-blasting chamber in the form of a heat-insulated tunnel containing a continuously moving conveyor belt on which the objects are disposed.
  • US 2004/053561 A1 describes a method and device for sandblasting.
  • a sandblasting agent receives at least one additional energy pulse from a gas flow which is placed at least under atmospheric pressure and suctioned by the low pressure in order to reach a final speed which is significantly greater than the speed of the carrier air flow downstream from the area where dosing occurs.
  • JP H10 151566 A relates to a burr removal method of removing burrs from objects to be processed comprising a step of preparing a burr removal device including a processing container and a plurality of objects to be processed, a step of setting the plurality of objects to be processed in the processing container, a step of stirring the plurality of objects to be processed which are set in the processing container, a step of removing burrs from the plurality of objects to be processed by allowing the abrasive grains to contact or collide with the plurality of objects to be processed.
  • JP H10 151566 A further relates to a burr removal device for removing burrs of objects to be processed, comprising a processing container in which a plurality of objects to be processed are set, a stirring mechanism which stirs the plurality of objects to be processed set in the processing container, and an abrasive grain feed mechanism which feeds abrasive grains to the plurality of objects to be processed that are in the state of being stirred by the stirring mechanism.
  • a new burr removal device for removing burrs of objects to be processed, and a new burr removal method for removing burrs of objects to be processed.
  • One aspect of the present invention provides a burr removal method for removing burrs of objects to be processed, as defined in claim 1.
  • the burr removal method includes the following steps (1) to (5).
  • the abrasive grains fed to the objects to be processed are accelerated to the predetermined speed by the air flow generated by operation of the suction mechanism (in the one embodiment, the speed of the abrasive grains, at the time when the abrasive grains contact or collide with the plurality of objects to be processed, is 5 to 30 m/sec).
  • the speed of the abrasive grains, at the time when the abrasive grains contact or collide with the plurality of objects to be processed is 5 to 30 m/sec.
  • the plurality of objects to be processed which are set in the processing container, are stirred, and thereby, burrs can be uniformly removed from all of the objects to be processed.
  • feeding of abrasive grains means simply feeding abrasive grains without initial speed to the objects to be processed, or feeding abrasive grains with a very small initial speed to the objects to be processed, and does not mean injecting or projecting abrasive grains to the objects to be processed as in the blasting device.
  • the abrasive grains may be fed to the objects to be processed by free falling.
  • the abrasive grains may be fed to the objects to be processed with a weak wind volume that does not cause the abrasive grains to scatter around, or does not affect the deburring processing.
  • each of the plurality of objects to be processed may be obtained by molding raw material powders, or by calcining an article formed by molding the raw material powders.
  • a molded body such as a green chip, formed by molding raw material powders, or a molded body formed by calcining an article formed by molding the raw material powders, that is, a molded body in the state before being sintered to become a sintered body
  • the strength of burrs is relatively lower than that in the sintered body.
  • the sintering means a treatment in which a molded body, formed by pressing and molding raw material particles, is heated to reduce the gap between the particles bonding the adjacent raw material particles, and thereby the molded body is baked and solidified.
  • each of the plurality of objects to be processed may be a ceramic or a magnetic material molded by a powder compacting molding method.
  • the molding method of the objects to be processed is not limited in particular. However, in the objects to be processed which are molded by the powder compacting molding method, mutually adjacent raw material particles, between the burr portion and the portion which can be a product, are not bonded to each other by heating. For this reason, burrs existing on the objects to be processed can be removed satisfactory.
  • the plurality of objects to be processed which are set in the processing container, may be made in a fluidized state and thereby be stirred in the step of stirring the plurality of objects to be processed.
  • the size of the objects to be processed is relatively small (for example, one side is 100 to 1600 ⁇ m). Therefore, since the plurality of objects to be processed are made in a fluidized state to thereby be stirred, the plurality of objects to be processed can be uniformly distributed.
  • the processing container may include a processing board and a frame body.
  • the processing board may have a first face, and a second face that is a surface on the opposite side of the first face.
  • a plurality of through holes which penetrate the processing board in the direction from the first face to the second face, may be provided.
  • Each of the plurality of through holes may have a size which enables each of the abrasive grains to pass through the through hole, and which prevents each of the plurality of objects to be processed from passing through the through hole.
  • the frame body may surround the peripheral edge of the processing board on the first face of the processing board.
  • the plurality of objects to be processed may be placed on the first face. In this case, without impairing the burr removing capability, it is possible to set the objects to be processed in the processing container and to stir the objects to be processed well.
  • the thickness of the processing board may be 30 to 100 ⁇ m.
  • a dihedral angle portion formed between the first face of the processing board and the frame body may be processed into an R surface having a radius of 0.5 to 5.0 mm.
  • the suction mechanism may be arranged on the side of the second face. Further, the air flow may be air flow directed from the first face to the second face.
  • the air flow is generated from the side of the first face to the side of the second face in the vicinity of the objects to be processed, that is, in the inside of the processing container, and hence, burrs of the objects to be processed can be satisfactorily removed.
  • the abrasive grains in the step of removing burrs of the plurality of objects to be processed, may be fed from the side of the first face to the plurality of objects to be processed.
  • the abrasive grains reaching the second face may be sucked and recovered by the suction mechanism.
  • the abrasive grains, and fine particles are made to flow to the suction mechanism, and hence, the powder dust can be prevented from being scattered in an area other than the area in which the deburring is performed.
  • the fine particles include abrasive grains in which cracks or chips are caused, and cutting powder produced by the deburring processing.
  • the ratio (passage rate) of the amount of the abrasive grains reaching the second face per unit time, with respect to the amount of the abrasive grains fed from the side of the first face to the plurality of stirred objects to be processed per unit time may be 80 to 95% by weight.
  • the passage rate is set in this range, the frequency of contact of the abrasive grains with the objects to be processed can be suppressed from being not less than a fixed value without hindering acceleration of the abrasive grains. For this reason, the abrasive grains can be accelerated satisfactorily, and thereby, burrs of the objects to be processed can be removed satisfactorily.
  • the ratio (suction rate) of the volume of the abrasive grains fed from the side of the first face to the plurality of objects to be processed per unit time with respect to the suction amount sucked by the suction mechanism per unit time may be 10 to 50% by volume.
  • the suction rate is set in this range, the amount of abrasive grains to the extent that burrs can be sufficiently removed can be obtained without hindering acceleration of the abrasive grains.
  • the suction rate is set in this range, the abrasive grains fed to the plurality of objects to be processed can be sufficiently sucked by the suction mechanism. For this reason, the abrasive grains can be accelerated satisfactorily, and the possibility that the abrasive grains and the fine particles are scattered to the surroundings can be reduced.
  • the fixing force of burrs may be reduced by stirring the plurality of objects to be processed in the step of stirring the plurality of objects to be processed.
  • the burr portions of the objects to be processed are brought into contact with the other objects to be processed and the processing container, and thereby, cracks, as starting points of fatigue fracture, are induced.
  • the deburring can be performed more easily by the abrasive grains.
  • the burr removal method may further include a step of straightening the air flow.
  • the mode in which the abrasive grains contact or collide with the plurality of objects to be processed may be controlled by straightening the air flow.
  • the action of the abrasive grains with respect to the objects to be processed is controlled by straightening the air flow, and thereby, the form of deburring can be changed. Thereby, the action of the abrasive grains can be changed according to the strength and form of the objects to be processed, the easiness of deburring, and the like.
  • the processing container in the step of stirring the plurality of objects to be processed, is arranged to be inclined at a predetermined angle (30 to 70° in one embodiment), and then, the plurality of objects to be processed may be stirred by rotating the processing container (in one embodiment, the rotational speed of the processing container is 5 to 50% of the critical rotational speed).
  • the centrifugal force by rotation of the processing container, and the component force of gravity along the processing board are applied to the objects to be processed.
  • the inclination angle and the number of rotation of the processing container are controlled, the plurality of objects to be processed can be made in a fluidized state by using these forces, so that the plurality of objects to be processed can be stirred satisfactorily.
  • the burr removal device includes: a processing container in which a plurality of objects to be processed are set; a stirring mechanism which stirs the plurality of objects to be processed set in the processing container; an abrasive grain feed mechanism which feeds abrasive grains to the plurality of objects to be processed that are in the state of being stirred by the stirring mechanism; and a suction mechanism which generates air flow in a direction from the abrasive grain feed mechanism to the processing container by suction force.
  • the abrasive grain feed mechanism feeds the abrasive grains to the plurality of objects to be processed by free falling from a discharge port positioned above the processing container, and the suction mechanism accelerates the abrasive grains, fed to the plurality of objects to be processed by the abrasive grain feed mechanism, to predetermined speed with the air flow, and removes burrs of the plurality of objects to be processed by causing the accelerated abrasive grains to contact or collide with the plurality of objects to be processed.
  • the suction mechanism recovers the abrasive grains after the abrasive grains contact with or collide with the plurality of objects to be processed.
  • the abrasive grains fed to the objects to be processed are accelerated to the predetermined speed by the air flow generated by operation of the suction mechanism.
  • the kinetic energy suitable for deburring is imparted to the abrasive grains reaching the objects to be processed. Therefore, when the abrasive grains contact or collide with the objects to be processed, it is possible to remove burrs from the objects to be processed without excessively cutting the objects to be processed.
  • the plurality of objects to be processed, which are set in the processing container are stirred, and thereby, burrs can be uniformly removed from all of the objects to be processed.
  • a burr removal device and an example of a burr removal method according to the present invention will be described with reference to the accompanying drawings.
  • a molded body obtained by molding and solidifying raw material powder that is, a molded body before it is sintered to become a sintered body is used as a workpiece (object to be processed).
  • the upward, downward, rightward and leftward directions indicate the directions in the drawings unless otherwise noted.
  • a burr removal device 01 which is used in the present embodiment, includes a processing container 10, a stirring mechanism 20, an abrasive grain feed mechanism 30, a suction mechanism 40, and a sorting mechanism 50.
  • the processing container 10 is a member for containing a workpiece W.
  • the workpiece W is an object to be processed, and is, for example, a molded body which configures an electronic component. Examples of electronic components include a capacitor, a resistor, an inductor, a varistor, a band pass filter, a piezoelectric element, and the like.
  • the workpiece W may be a molded body obtained by molding raw material powder, or may also be a molded body obtained by calcining an article formed by molding raw material powder.
  • the workpiece W may be ceramics or magnetic material which is molded by a powder compacting molding method.
  • the workpiece W may have a rectangular shape, and one side of the workpiece W may be, for example, about 100 to 1600 ⁇ m.
  • the processing container 10 is provided with a processing board 11.
  • the processing board 11 has a first face 11a (placement face) which is a face on which the workpiece W is placed, and a second face 11b which is a reverse face to the first face 11a.
  • the processing board 11 has a plurality of opening portions which have air permeability and can allow the abrasive grains to pass therethrough, but which can prevent the workpiece W from passing therethrough and can allow the workpiece W to be retained on the side of the first face 11a.
  • a plurality of through holes which penetrate the processing board 11 in the direction from the first face 11a toward the second face 11b are provided.
  • Each of the plurality of through holes has a dimension such that each of abrasive grains G is capable of passing through and the workpiece W is incapable of passing through.
  • the processing board 11 may be, for example, a board configured to be mesh-like, a perforated metal, or a board in which a plurality of slits are provided.
  • the shape of the processing board 11 is not specially limited.
  • the processing container 10 of the present embodiment includes the processing board 11 in a disc shape configured to be mesh-like, and a frame body 12 fixed to the outer edge part of the processing board 11.
  • the frame body 12 surrounds the peripheral edge of the processing board 11 at least on the first face 11a of the processing board 11.
  • the processing container 10 of the present embodiment has a cylindrical shape in which an upper part above the processing board 11 (first face 11a side) is open.
  • the stirring mechanism 20 is connected to the processing container 10, and stirs a plurality of the workpieces W housed (set) in the processing container 10 so that the plurality of workpieces W can be in a fluidized state.
  • the configuration of the stirring mechanism 20 is not specially limited as long as the workpieces W can be stirred.
  • the stirring mechanism 20 may be configured to rotate the processing container 10 or may be configured to vibrate the processing container 10.
  • the stirring mechanism 20 another known configuration may be used.
  • the stirring mechanism 20 rotates the processing container 10 with the center of the plane of the processing board 11 being as an axial center.
  • the stirring mechanism 20 includes a retaining member 21 and a rotary mechanism 22.
  • the retaining member 21 rotatably retains the processing container 10 in the state of inclining the processing container 10 at a predetermined inclination angle ⁇ .
  • the rotary mechanism 22 is a mechanism that rotates the processing container 10 at a predetermined speed.
  • the rotary mechanism 22 includes a motor 22a that generates rotational force, and a rotational force transmission member 22b that transmits the rotational force of the motor 22a to the processing container 10.
  • the abrasive grain feed mechanism 30 is a mechanism for feeding the abrasive grains G toward the workpiece W.
  • the abrasive grain feed mechanism 30 includes a reservoir tank 31 and a carrying-out part 32.
  • the reservoir tank 31 is a tank for storing the abrasive grains G.
  • a discharge port 32a is provided in the carrying-out part 32.
  • the carrying-out part 32 is disposed in such a way that the discharge port 32a is positioned above the first face 11a of the processing board 11.
  • the carrying-out part 32 may be configured so as to be able to discharge the abrasive grains G in the reservoir tank 31 (hopper) through the discharge port 32a by a fixed amount.
  • the carrying-out part 32 may be configured, for example, to include a carrying screw and a trough enclosing the carrying screw, and to put the abrasive grains G in the reservoir tank 31 forward to the discharge port 32a provided at the trough.
  • the carrying-out part 32 may include a disc-shaped bottom table and a scraper (not shown in the figure) horizontally rotating with the center of the bottom table being as an axial center.
  • the carrying-out part 32 may be configured to deposit a predetermined amount of abrasive grains G on the bottom table at an angle of repose by disposing the bottom face of the reservoir tank 31 slightly separated from the bottom table, and to scrape this out by the scraper toward the discharge port 32a.
  • the carrying-out part 32 another known configuration may be used.
  • the carrying-out part 32 includes the former configuration.
  • the suction mechanism 40 includes both a function of accelerating the abrasive grains G and a function of sucking the same.
  • the suction mechanism 40 includes a hose 43 and a dust collector 42.
  • One end face of the hose 43 (in the present embodiment, a suction part 41) is provided below the second face 11b of the processing board 11 and is separated from the second face 11b.
  • the dust collector 42 is joined to the hose 43.
  • the sorting mechanism 50 is a mechanism that sorts out a reusable abrasive grains from powder dust. Moreover, the sorting mechanism 50 is disposed in the middle of the path from the suction part 41 toward the dust collector 42. Namely, a first hose 43a whose one end face forms the suction part 41 is joined to the sorting mechanism 50, and the sorting mechanism 50 is joined to the dust collector 42 with a second hose 43b. As mentioned later, the sorting mechanism 50 is a mechanism that separates powder dust into the reusable abrasive grains and other fine particles (abrasive grains in which cracks or defects arise and cutting powder, of the workpiece, which arises through the removal of burrs).
  • the sorting mechanism 50 may be configured to perform classification using a difference in specific gravity of the powder dust and an air flow.
  • a cyclone separator for example, a centrifugal classifier, or another known configuration may be used.
  • a cyclone separator is used, and the bottom part of the cyclone separator is joined to the reservoir tank 31.
  • the burr removal device 01 and a plurality of workpieces W are prepared.
  • the abrasive grains G are beforehand loaded in the reservoir tank 31 shown in Fig. 1 .
  • the material of the abrasive grains G used in the present embodiment can be properly selected depending on the material and the shape of the workpiece W and the purpose of processing the same.
  • the abrasive grains G can be selected from metallic or nonmetallic particles (shot, grid and cut wire), ceramic particles (Al 2 O 3 , SiC, ZrO 2 and the like), natural stone particles (emery, silica stone, diamond and the like), plant particles (walnut shells, peach seeds, apricot seeds and the like), and resin particles (nylon, melamine, urea and the like).
  • the particle diameter of each of the abrasive grains G can also be properly selected depending on the material and the shape of the workpiece W and the purpose of processing the same. It should be noted that the particle diameter of each of the abrasive grains G must be selected such that it is a diameter to be capable of passing through the opening parts (through holes) of the processing container 10. For example, in the case of setting ceramic particles as the abrasive grains G, the particle diameter of each of the abrasive grains G is selected such that the particle size defined by JIS (Japanese Industrial Standards) R6001;1998 is F220, or #240 or more and #1000 or less, and it is a diameter to be capable of passing through the opening parts (through holes) of the processing container 10.
  • JIS Japanese Industrial Standards
  • a plurality of workpieces W are contained (set) in the processing container 10 by placing the plurality of workpieces W on the first face 11a of the processing board 11.
  • the contained amount of the workpieces W is properly selected to meet the property of the workpieces W and the size of the processing container 10 so as to be able to retain the workpieces W with the processing container 10 and to stir the plurality of workpieces W by favorably setting the workpieces W in the fluidized state. It should be noted that, in Fig. 2 , one workpiece W is illustrated for convenience.
  • the motor 22a is operated and the processing container 10 is rotated.
  • the workpieces W contained in the processing container 10 move along the frame body 12, following the rotation of the processing container 10. Since the processing container 10 is inclined and retained, centrifugal force in the direction toward the frame body 12 and a component of force of the gravity along the processing board 11 are exerted on the workpieces W.
  • a workpiece W moves (rises) up to a predetermined position, since the component of force of the gravity becomes larger than the centrifugal force, the workpiece W departs from the frame body 12 and falls downward along the processing board 11. In this way, movements and falls of the workpieces W continuously occur, and thereby, the plurality of workpieces W are brought into the fluidized state.
  • the inclination angle ⁇ of the processing container 10 may be 30 to 70° relative to the horizontal plane, or may be 40 to 60°.
  • the inclination angle ⁇ of the processing container 10 is too small, the effect of promoting the fluidization by the gravity is small.
  • the inclination angle ⁇ of the processing container 10 is too large, since the component of force of the gravity becomes too larger than the centrifugal force, it is difficult to move the workpieces W, causing them to follow the rotation of the processing container 10.
  • the rotational speed of the processing container 10 may be 5 to 50% of the critical rotational speed or may be 10 to 30% thereof.
  • the critical rotational speed means the rotational speed in the case where, when the rotational speed of the processing container 10 is increased, the centrifugal force applied to the workpieces W becomes larger than the component force of gravity, and thereby, the workpieces W are rotated together with the frame body 12 without falling.
  • the rotational speed of the processing container 10 is too slow, the effect of gravity is too larger than the effect of the centrifugal force, and thereby, the movement of the workpieces W along the frame body 12 of the processing container 10 is not sufficiently performed. As a result, the fluidization via falling of the workpieces W is not sufficiently caused.
  • the workpieces W when the workpieces W are stirred in the fluidized state, the workpieces W collide with each other, and thereby, the fixing force of the burrs formed on the workpieces W is reduced, so that the burrs are easily removed from the workpiece W.
  • the mode of the abrasive grains G colliding with or contacting with the workpiece W can be intentionally changed (controlled).
  • This step can be performed, for example, by changing the position and the dimension of the suction part 41, the suction amount of the dust collector 42, and the like.
  • the mode of the abrasive grains G colliding with or contacting with the workpiece W can be easily changed by the straightening step (S05).
  • the straightening step S05 may be omitted.
  • the abrasive grains G loaded in the reservoir tank 31 are discharged through the discharge port 32a by a fixed amount, and are fed (fall in the case of the present embodiment) toward the workpiece W.
  • the speed of the abrasive grains G toward the workpieces W is 0 m/sec or is very low. Therefore, even when the abrasive grains G collide or contact with the workpieces W in the state of free fall and without receiving external force, such as suction force, the burrs of the workpieces W are not removed.
  • the abrasive grains G discharged through the discharge port 32a reach, by the air flow generated in the step of generating air flow (S04), an acceleration region A (region in which this air flow arises on the first face 11a side) through free fall.
  • the abrasive grains G having reached the acceleration region A are accelerated toward the suction part 41 in such a way that the speed in the occasion of colliding with or contacting with the workpiece W is a predetermined speed.
  • This predetermined speed may be a speed at which the burrs of the workpieces W can be favorably removed and neither damage on nor sticking of the abrasive grain G into the workpiece W arise.
  • this predetermined speed may be 5 to 30 m/sec or may be 10 to 20 m/sec.
  • This predetermined speed is very low speed for removing the burrs by contact or collision of the abrasive grains, and hence, cannot be realized by the conventional burr removal method.
  • the injection pressure is high (for example, 0.2 MPa or more), and hence, it is impossible to realize the very slow speed, such as the above-described predetermined speed.
  • the speed of the abrasive grains G can be set to very low speed at the time when the abrasive grains G collide or contact with the workpieces W, and hence, the burrs of the workpieces W can be removed by the abrasive grains G with very low speed. Adjustment of this speed can be performed by adjustment of suction amount with the dust collector 42, change of the dimension and the shape of the suction part 41, and the like.
  • the adjustment of the suction amount with the dust collector 42 can be performed, for example, by change of the rotational speed of a motor built in the dust collector 42, adjustment of the degree of opening of a dumper, the dumper for sucking the outside air being provided in the hose 43, or the like.
  • the abrasive grains G having reached the acceleration region A are being accelerated and travelling toward the suction part 41, and reaches the processed surface of the workpiece W. After that, the abrasive grains G collide with or contact with the workpiece W, and after that, further travels toward the suction part 41.
  • Actions F shown in Fig. 2 indicate the actions of the abrasive grains G. Examples of modes of the abrasive grains G colliding with or contacting with the workpiece W are described as actions F1, F2 and F3.
  • Action F1 the abrasive grains G linearly collide with the burrs of the workpiece W and then rebound from the workpiece W. The burrs are removed by the impact force when the abrasive grains G collide with the workpiece W.
  • Action F2 After colliding with the upper face of the workpiece W, the abrasive grains G travel along the upper face. The burrs are removed with the impact force in the occasion when the abrasive grains G collide with the workpiece W and friction force in the occasion when the abrasive grains G travel along the upper face.
  • Action F3 The abrasive grains G travel in such a way as to go along the dihedral angle portions of the workpiece W.
  • the burrs are removed with at least any of the impact force in the occasion when the abrasive grains G collide with the dihedral angle portions of the workpiece W and friction force in the occasion when they pass on the dihedral angle portions.
  • the abrasive grains G having collided with or contacted with the workpiece W pass through the processing board 11 and move onto the second face 11b side.
  • the abrasive grains G having moved onto the second face 11b side are sucked from the suction part 41 by the dust collector 42.
  • the aforementioned fine particles also pass through the processing board 11 and are sucked from the suction part 41.
  • Powder dust of the abrasive grains G and the fine particles passes through the first hose 43a and is transferred to the sorting mechanism 50.
  • the sorting mechanism 50 is a cyclone separator, the powder dust introduced from the upper part of the cyclone separator in such a way as to go along the wall surface spirally falls.
  • the fine particles which are particles light in mass float upward, pass through the second hose 43b connected to the ceiling part of the cyclone separator, and are collected in the dust collector 42.
  • the abrasive grains G which are reusable and particles heavy in mass move toward the bottom part of the sorting mechanism 50, and are stored in the reservoir tank 31 joined to the bottom part of the sorting mechanism 50. These abrasive grains G are fed again toward the workpiece W through the discharge port 32a.
  • the abrasive grains G which are fed through the discharge port 32a in the abrasive grain feed mechanism 30 disposed on the first face 11a side and are accelerated at the predetermined speed with the air flow generated by the dust collector 42 collide with or contact with the workpiece W, and thereby, the burrs of the workpiece W are removed.
  • the abrasive grains G after colliding with or contacting with the workpiece W are sucked into the suction part 41 disposed on the second face 11b side. In this way, the abrasive grains G do not scatter around as in blasting processing which is a conventional burr removal method.
  • the speed of the abrasive grains G in the occasion when the abrasive grains G collide with or contact with the workpiece W can be set to be exceedingly slow, even in the case of removing the burrs of the workpiece W that is relatively low in hardness, the burrs of the workpiece W can be favorably removed without damaging the workpiece W.
  • a molded body configuring an electronic component is used as the workpiece W, it is possible to manufacture a highly reliable electronic component.
  • the thickness of the processing board 11 may be 30 to 100 ⁇ m.
  • the thickness of the processing board 11 is too small, there is a possibility that the processing board 11 is broken while burrs are removed.
  • the thickness of the processing board 11 is too large, the distance of the processing board 11, through which the abrasive grains G pass, is too long, and thereby, the possibility of clogging of the abrasive grains G is increased and the abrasive grains G are not sufficiently accelerated in the acceleration region A due to the pressure loss.
  • the radius size (dihedral angle radius) of the dihedral angle formed between the frame body 12 and the first face 11a of the processing board 11 may be 0.5 to 5.0 mm.
  • the dihedral angle portion which is formed between the frame body 12 and the first face 11a of the processing board 11, may be processed into an R surface having a radius of 0.5 to 5.0 mm.
  • the dihedral angle radius is too small, the possibility that the workpieces W are caught in the dihedral angle portion becomes high, while, when the dihedral angle radius is too large, it becomes difficult to retain the workpieces W in the processing container 10.
  • the "suction rate” means a rate of the volume (volume/ second) of the abrasive grains fed from the abrasive grain feed mechanism 30 per unit time, with respect to the suction amount (volume/ second) sucked by the suction mechanism 40 per unit time.
  • the "passage rate” means a rate of the amount (gram/ second) of the abrasive grains G reaching the side of the second face 11b per unit time, with respect to the amount (gram/ second) of the abrasive grains G fed from the side of the first face 11a to the plurality of workpieces W in the fluidized state per unit time.
  • the amount (gram) of the abrasive grains G fed from the side of the first face 11a to the plurality of workpieces W in the fluidized state means the weight of the abrasive grains G discharged from the discharge port 32a. Further, the amount (gram) of the abrasive grains G reaching the side of the second face 11b means the weight of the abrasive grains G sucked by the suction mechanism 40 through the processing board 11.
  • the suction rate may be in the range of 10 to 50% by volume.
  • the suction rate is too low, the amount of the abrasive grains G discharged from the discharge port 32a is smaller than the suction amount sucked by the suction mechanism 40, and hence, the burrs of the plurality of workpieces W cannot be sufficiently removed.
  • the suction rate is too high, the amount of the abrasive grains G discharged from the discharge port 32a is larger than the suction amount sucked by the suction mechanism 40. Therefore, in the acceleration region A, the abrasive grains G cannot be sufficiently accelerated to the speed at which the burrs of the workpieces W can be removed. Further, the abrasive grains G and fine particles are scattered around.
  • the passage rate may be in the range of 80 to 95% by weight.
  • the passage rate is too high, the distance between the plurality of workpieces W, through which the abrasive grains G pass, is too short, and thereby, the frequency, at which the abrasive grains G are brought into contact with the workpieces W, becomes low, so that the burrs of the workpieces W cannot be satisfactorily removed.
  • the passage rate is too low, the distance between the plurality of workpieces W, through which the abrasive grains G pass, is too long, and thereby, the time during which the abrasive grains G are not accelerated by the air flow and retained between the plurality of workpieces W is increased, so that the removal of burrs of the workpieces W is hindered.
  • the workpiece A is a ceramic molded article before sintering, which is obtained by molding the composite material (SiC/ Al 2 O 3 ) by compression molding.
  • the size of the workpiece A is 0.5 mm ⁇ 0.5 mm ⁇ 1.0 mm, and the Vickers hardness of the workpiece A is Hv 100.
  • Workpiece B is a ceramic molded article before sintering, which is obtained by molding ferrite powder with spinel crystal structure by compression molding.
  • the size of the workpiece B is 0.5 mm ⁇ 0.5 mm ⁇ 1.0 mm, and the Vickers hardness of the workpiece B is Hv 20.
  • the burr removal device of the above-described embodiment is used. Further, as a comparative example, a prior art blasting device (modification of the drum type blasting device MY-30C manufactured by SINTOKOGIO, LTD.) is used.
  • burrs of each of the workpieces W were removed by using the abrasive grain A and the abrasive grain B.
  • the abrasive grain A is alumina particle having an average particle diameter of 18 ⁇ m (WA#800 manufactured by SINTOKOGIO, LTD.), and the apparent density of the abrasive grain A is 4.0 g/cm 3 .
  • the abrasive grain B is ferrite particle having an average particle diameter of 14 ⁇ m, and the apparent density of the abrasive grain B is 2.5 g/cm 3 .
  • the deburring of the workpieces W was performed by operating the burr removal device or the blasting device for 30 minutes, and then, the processed state of each of the workpieces W was evaluated.
  • the evaluation of the processed state was carried out by examining the workpieces, as examination objects, by using a microscope (VHX-2000 manufactured by Keyence Corporation).
  • the workpieces, as examination objects, in the amount of 1/5 of the volume of the processing container, were housed in the processing container.
  • twenty workpieces, sampled from the total amount of the workpieces were used as the workpieces as examination objects.
  • the evaluation criteria of the processed state are as follows.
  • the periphery of the processing container 10 was examined. Further, after the deburring of the workpieces W was performed by using the blasting device, the periphery of the drum was examined. Then, evaluation of scattering of the abrasive grains was taken as "O" when adhesion of the abrasive grains was not observed in the periphery of the processing container 10 or in the periphery of the drum, and evaluation of scattering of the abrasive grains was taken as "X" when adhesion of the abrasive grains was observed in the periphery of the processing container 10 or in the periphery of the drum.
  • evaluation of scattering of the workpieces was taken as "O" when workpieces were not observed in the periphery of the processing container 10 or in the periphery of the drum, and evaluation of scattering of the workpieces was taken as "X" when workpieces were observed in the periphery of the processing container 10 or in the periphery of the drum.
  • the results of the above-described evaluation in each of the conditions are shown in Table 1.
  • the "inclination angle”, as the item of device in Table 1, represents the inclination angle ⁇ (°) of the processing container 10 with respect to the horizontal plane in the burr removal device of the above-described embodiment as shown in Fig. 1 , and represents the inclination angle of the drum with respect to the horizontal plane in the blasting device.
  • the "rotational speed” represents the ratio (%) of the rotational speed with respect to the critical rotational speed.
  • the results are described, which are obtained by measuring beforehand the grain speed of the abrasive grains just before contact with the workpiece W in each of the conditions by using the flow rate measurement system (PIV system manufactured by Flowtech Research Inc.). Further, the "thickness” represents the thickness ( ⁇ m) of the processing board 11, and the “dihedral angle radius” represents the size (mm) of the radius of the dihedral angle formed between the first face 11a of the processing board 11 and the frame body 12.
  • the suction rate is changed by changing the amount (grams/second) of the abrasive grains fed from the side of the first face 11a to the plurality of workpieces W in the fluidized state.
  • the amount of the abrasive grains fed from the side of the first face 11a to the plurality of workpieces W in the fluidized state per unit time, and the amount of the abrasive grains reaching the side of the second face 11b per unit time were measured beforehand, and thereby, the passage rate was calculated. Specifically, the passage rate was calculated in such a manner that sintered products of workpieces A with no burr were used as workpieces, and that the following measurements (1) and (2) were performed when the burr removal device was operated for 1 minute.
  • reference conditions are set such that the inclination angle of the processing container 10 was set to 45 degrees, the rotational speed was set to 30%, the thickness of the processing board 11 was set to 40 ⁇ m, the dihedral angle radius of the processing board 11 was set to 1.0 mm, the speed of abrasive grains was set to 15 m/sec, and the suction rate was set to 30%.
  • the suction rate was changed between 5 to 60% by volume, and the deburring of the workpieces A was performed by using the abrasive grains A (Examples 1 to 5).
  • the suction rate was changed between 5 and 60% by volume, and the deburring of the workpieces B was performed by using the abrasive grains B (Examples 17 to 21).
  • the suction rate was set between 10 and 50% by volume, all of the processed states were evaluated as "O" or " ⁇ " regardless of the type of the workpieces (Examples 1 to 3 and Examples 17 to 19).
  • the suction rate was outside the range between 10 and 50% by volume, the processed states were evaluated as "X" (Examples 4 and 5 and Examples 20 and 21).
  • the deburring of the workpieces A and the workpieces B was performed by changing in order one of "inclination speed”, “rotational speed”, “speed”, “thickness” and "dihedral angle radius” of the above-described reference conditions (Examples 6 to 15 and Examples 22 to 31). It should be noted that the deburring of the workpieces A was performed by using the abrasive grains A, and the deburring of the workpieces B was performed by using the abrasive grains B. As a result, all of the processed states were evaluated as “O” or " ⁇ ". In the examples in which the processed states were evaluated as " ⁇ ", burrs were slightly remained on the workpieces, and the workpieces were not damaged, which represent that, when the processing time is further increased, the evaluation of the processed states may become "O".
  • the passage ratio was 80 to 95% by weight in the examples (Examples 1 to 3, Examples 6 to 19, Examples 22 to 31), in each of which the evaluation of the processed state was "O" or " ⁇ ". For this reason, in the passage rate in this range, the deburring can be performed satisfactorily.
  • the deburring of the workpieces A was performed by using the abrasive grains B made of ferrite material which is different from alumina material used as the material of the workpieces A.
  • the deburring of the workpieces B was performed by using the abrasive grains A made of alumina material which is different from ferrite material used as the material of the workpieces B.
  • the burr removal device of the above-described embodiment can remove burrs from the workpieces W without scattering the abrasive grains to the periphery and without blowing off the workpieces.
  • abrasive grains are accelerated to a predetermined speed by air flow, to receive kinetic energy suitable for the deburring, and thereby, the abrasive grains having the kinetic energy collide or contact with the workpieces, to remove burrs of the workpieces. Further, the total amount of the abrasive grains and fine particles are recovered by a suction member. Thereby, the following effects are obtained.
  • burr removal method of the one embodiment can be satisfactorily used for workpieces with relatively low hardness (for example, copper, aluminum, or the like).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP15867853.2A 2014-12-08 2015-10-29 Burr removal device and burr removal method Active EP3231556B1 (en)

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JP2015092456 2015-04-29
PCT/JP2015/080599 WO2016092975A1 (ja) 2014-12-08 2015-10-29 バリ取り装置およびバリの除去方法

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CN109531434A (zh) * 2018-12-26 2019-03-29 富乐压铸(太仓)有限公司 一种惯性盘冷冻去毛刺的处理方法
CN109746686B (zh) * 2019-01-14 2020-10-23 诸暨市轩镨机械科技有限公司 一种机械生产用钻孔去毛刺一体机
IT201900007052A1 (it) * 2019-05-21 2020-11-21 Paolo Redaelli Metodo per vibrosabbiatura perfezionato e macchina relativa
KR102085922B1 (ko) * 2019-06-19 2020-03-06 박철수 사출물의 이바리 제거장치

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JPWO2016092975A1 (ja) 2017-09-14
JP6489131B2 (ja) 2019-03-27
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CN107000161B (zh) 2019-07-02
WO2016092975A1 (ja) 2016-06-16
TW201628774A (zh) 2016-08-16
KR20170092623A (ko) 2017-08-11
EP3231556A1 (en) 2017-10-18
CN107000161A (zh) 2017-08-01
EP3231556A4 (en) 2018-05-23

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