TW201628774A - Burr removal device and burr removal method - Google Patents

Abstract

A burr removal method including: a step in which a burr removal device and a plurality of articles to be processed are prepared, said burr removal device including a processing container and a suction mechanism that generates suction force; a step in which the plurality of articles to be processed are set in the processing container; a step in which the plurality of articles to be processed, which have been set in the processing container, are agitated; and a step in which abrasive grains, released towards the plurality of articles to be processed that are in an agitated state, are accelerated to a prescribed speed by an air current generated by the action of the suction mechanism, the abrasive grains are caused to come in contact with or collide with the plurality of articles to be processed, thereby removing burrs on the plurality of articles to be processed.

Description

Deburring device and method for removing burrs

The present disclosure relates to a deburring device and a method for removing burrs for removing burrs of a processed article.

Electronic components are widely used in electronic devices such as smart phones, tablet terminals, and walkmans. In particular, in recent years, with the miniaturization of electronic equipment, the industry has expected smaller electronic parts.

As the electronic component, a raw material powder of a hard and brittle material such as ceramic or a magnetic material is molded by a press molding method, a doctor blade method, or an injection molding method, and then fired. When there is a burr in the molded body constituting the electronic component, for example, the performance of the electronic device due to the burr in the mounting step by the automatic mounting machine is degraded, and the mounting failure due to burrs is caused. Remove the burrs before installation.

As a method of removing burrs of a molded body constituting an electronic component, Patent Document 1 discloses a method of removing burrs by a wet cylindrical polishing method. Patent Document 1 discloses a method in which a slurry containing a raw material is formed into a sheet shape to produce a green sheet, and the raw wafer is burred by polishing by wet cylindrical polishing to cut the green sheet. Remove. Since the wet cylindrical polishing method is a polishing method having a relatively high polishing ability, it is excessively polished depending on the strength of the molded body to affect the dimensional accuracy of the electronic component. Further, since the treatment of the waste water generated by the polishing and the drying of the molded body after the polishing are necessary, the manufacturing cost increases.

As another method of removing the burrs of the molded body constituting the electronic component, it is considered A method of squirting a device with air (for example, paragraph 0002 of Patent Document 2). In general, the air blasting device sprays the abrasive grains together with the compressed air of a very high pressure of 0.2 MPa or more as a gas-solid two-phase flow. Therefore, in the case where the burr of a small workpiece such as an electronic component is removed by grinding, the workpiece itself is scattered to the surroundings by the gas-solid two-phase flow. Further, in the method using the air blasting device, since the polishing force is stronger than the above-described cylindrical polishing method, there are defects such as cracking and missing defects depending on the strength of the workpiece.

[Previous Technical Literature] [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open Publication No. 2008-227314

Patent Document 2: Japanese Patent Laid-Open Publication No. 2010-188470

In the art, a new deburring device and a method for removing burrs for removing burrs of a processed article are desired.

In one aspect of the invention, a method of removing burrs for removing burrs of a treated article is provided. The method for removing the burr includes the following steps (1) to (4).

(1) A step of preparing a deburring device and a plurality of processed articles, the deburring device comprising a processing container and a suction mechanism for generating a suction force.

(2) A step of placing a plurality of processed articles in a processing container.

(3) A step of stirring a plurality of processed articles placed in the processing vessel.

(4) using the airflow generated by the action of the suction mechanism, the abrasive grains input to the plurality of processed articles in the agitated state are accelerated to a specific speed, and the abrasive grains are brought into contact with or collided with the plurality of processed articles. And the step of removing the burrs of the plurality of processed articles.

According to the method of removing the burr of one aspect, the abrasive grain invested in the processed product The airflow generated by the action of the suction mechanism is accelerated to a specific speed (in one embodiment, the speed of the abrasive grains when the abrasive grains come into contact with or collide with a plurality of processed articles is 5 to 30 m/sec). By this acceleration, the abrasive grains have kinetic energy suitable for removing the burrs. Therefore, when the abrasive grains come into contact with or collide with the workpiece, the workpiece is not excessively cut, and the burrs can be removed from the workpiece. At this time, since a plurality of processed articles provided in the processing container are stirred, the burrs can be uniformly removed from all the processed articles. In addition, the term "input of the abrasive grains" as used herein means that the abrasive grains are supplied only at an initial velocity toward the workpiece, or the abrasive grains are supplied at a very small initial velocity toward the workpiece, and such as a spray. The processing device sprays or projects the abrasive grains differently toward the workpiece. For example, the abrasive grains may be supplied toward the object to be treated by freely dropping the abrasive grains, or the abrasive grains may be oriented toward the treated air without being scattered to the surroundings or to a degree that does not affect the removal process of the burrs. Product supply.

In the method for removing burrs according to an embodiment, each of the plurality of processed articles may be obtained by molding the raw material powder or by calcining the raw material powder. For example, a molded body obtained by molding a raw material powder like a green wafer, or a molded body obtained by molding a raw material powder, that is, a molded body in a state before being fired to form a sintered body, has a relatively low burr strength compared with a sintered body. Therefore, the burr can be satisfactorily removed by using the formed body as the object of removing the burr. Here, the term "baking" refers to heating of a molded body formed by pressurizing the raw material particles, and the adjacent raw material particles are subsequently reduced to reduce the gap between the particles, thereby sintering and solidifying.

In the method for removing burrs according to an embodiment, each of the plurality of processed articles may be a ceramic or a magnetic material formed by a powder molding method. The molding method of the article to be treated is not particularly limited, and in the article to be processed which is formed by the powder molding method, the raw material particles adjacent to each other in the portion which can be a product and the burr portion are not heated by heating. Therefore, the burrs existing in the article to be treated can be removed particularly well.

In the method for removing burrs according to an embodiment, in the step of stirring a plurality of processed articles, a plurality of processed articles disposed in the processing container may be fluidized. The plurality of processed articles are stirred. Since the object to be treated has a relatively small size (for example, 100 to 1600 μm on one side), it is possible to uniformly disperse a plurality of processed articles by stirring them in a flowing state.

In the method for removing burrs according to an embodiment, the processing container may be provided with a processing disk and a frame. The processing disk may also have a second surface opposite to the first side and the first side. The processing disk may be provided with a plurality of through holes penetrating through the processing disk in a direction from the first surface toward the second surface. Each of the plurality of through holes may have a size that allows the abrasive particles to pass therethrough and cannot pass through each of the plurality of processed articles. The frame may also surround the periphery of the processing disk in the first side of the processing disk. Further, in the step of providing a plurality of processed articles in the processing container, a plurality of processed articles may be placed on the first surface. In this case, the processed article can be placed in the processing container without damaging the burr removal ability, and stirred well.

In the method for removing the burr according to the embodiment, the thickness of the processing disk may be 30 to 100 μm, and the edge portion formed by the first surface of the processing disk and the frame may be processed into an R surface having a radius of 0.5 to 5.0 mm. According to this configuration, it is possible to suppress the workpiece from remaining in the corner portion of the processing container or to prevent the member from being sandwiched between the members forming the processing container.

In the method of removing burrs according to an embodiment, the suction mechanism may be disposed on the second surface side. Moreover, the air flow may also be a gas flow from the first side toward the second side. According to this configuration, the airflow from the first surface side toward the second surface side is generated in the vicinity of the workpiece, that is, in the processing container, so that the burr of the workpiece can be favorably removed by the air current.

The method of removing burrs of one embodiment may further comprise the step of recovering abrasive particles. In the step of removing the burrs of the plurality of processed articles, the abrasive grains may be supplied from the first surface side toward the plurality of processed articles. In the step of recovering the abrasive grains, the abrasive particles reaching the second surface may be suctioned by a suction mechanism to be recovered. The abrasive grains and the fine particles (the above-mentioned abrasive grains and fine particles are collectively referred to as "dust" in the following) are advanced toward the suction mechanism, so that the dust can be prevented from scattering to the outside of the region where the burrs are removed. The microparticles include abrasive particles that cause cracks or omissions, and cutting powders that are produced by the removal of burrs.

In the method for removing burrs according to an embodiment, the amount of the abrasive grains reaching the second surface per unit time is proportional to the amount of the abrasive grains which are supplied from the first surface side to the plurality of workpieces to be agitated per unit time ( The ratio can also be 80 to 95% by weight. By setting the passage ratio to this range without impeding the acceleration of the abrasive grains, it is possible to suppress the frequency at which the abrasive grains come into contact with the workpiece to be fixed or more. Therefore, the abrasive grains are favorably accelerated, and the burrs of the workpiece can be removed well.

In the method for removing burrs according to an embodiment, the ratio of the volume of the abrasive grains injected from the first surface side toward the plurality of processed articles per unit time with respect to the suction flow rate sucked by the suction mechanism per unit time (suction The ratio) may also be 10 to 50% by volume. By setting the suction ratio to this range without impeding the acceleration of the abrasive grains, it is possible to set the amount of the abrasive grains to the extent that the removal of the burrs can be sufficiently performed. Further, by setting the suction ratio to the above range, it is possible to sufficiently suck the abrasive grains that are supplied toward the plurality of processed articles by the suction mechanism. Therefore, the abrasive grains are well accelerated, and the possibility that the abrasive grains and the fine particles are scattered to the surroundings is lowered.

In the method of removing burrs according to an embodiment, in the step of stirring a plurality of processed articles, the squeezing force may be weakened by stirring a plurality of processed articles. When the burr portion of the workpiece is brought into contact with other processed articles and processing containers, cracks which are the starting point of fatigue damage are induced. As a result, the removal of the burrs by the abrasive grains can be performed more easily.

The burr removal method of one embodiment may further comprise the step of rectifying the gas flow. In the rectifying step, the surface of the abrasive particles contacting or colliding with the plurality of processed articles may also be controlled by rectifying the airflow. By rectifying the airflow, it is possible to control the behavior of the abrasive particles with respect to the object to be treated, and to change the shape of the deburring. Thereby, the behavior of the abrasive grains can be changed in accordance with the strength and form of the article to be processed, the ease of removal of the burrs, and the like.

In the method for removing burrs according to an embodiment, in the step of stirring a plurality of processed articles, the processing container may be inclined at a specific angle (30 to 70° in one embodiment), and The processing container is rotated (in one embodiment, the processing container The rotation speed is 5 to 50% of the critical rotation speed, and a plurality of processed articles are stirred. In this case, the centrifugal force generated by the rotation of the processing container and the component force of gravity along the processing disk are added to the processed article. By controlling the inclination angle and the number of revolutions of the processing container, it is possible to use these forces to make a plurality of processed articles into a flowing state and to perform a good stirring.

In another aspect of the invention, a deburring device for removing burrs of a treated article is provided. The deburring device includes: a processing container for arranging a plurality of processed articles; a stirring mechanism for stirring a plurality of processed articles disposed in the processing container; and an abrasive grain supplying mechanism that is stirred toward the stirring mechanism The plurality of processed articles are loaded into the abrasive grains; and the suction mechanism generates an air flow in a direction from the abrasive grain supply mechanism toward the processing container by the suction force. The suction mechanism accelerates the abrasive grains injected into the plurality of processed articles by the abrasive grain supply mechanism to a specific speed by the air flow, and causes the accelerated abrasive grains to contact or collide with the plurality of processed articles, thereby The burrs of a plurality of processed articles are removed.

According to another aspect of the deburring device, the abrasive grains thrown toward the workpiece are accelerated to a specific speed by the airflow generated by the action of the suction mechanism. By this acceleration, the abrasive grains reaching the object to be treated have kinetic energy suitable for the removal of the burrs. Therefore, when the abrasive grains collide or come into contact with the workpiece, the workpiece is not excessively cut, and the burr can be removed from the workpiece. At this time, since a plurality of processed articles provided in the processing container are stirred, the burrs can be uniformly removed from all the processed articles.

According to various aspects and embodiments of the present invention, it is possible to obtain a processed article in which the burr is well removed.

01‧‧‧Deburring device

10‧‧‧Processing containers

11‧‧‧Processing tray

11a‧‧‧ first side

11b‧‧‧ second side

12‧‧‧ frame

20‧‧‧Agitating mechanism

21‧‧‧ Keeping components

22‧‧‧Rotating mechanism

22a‧‧‧Motor

22b‧‧‧Rotary force transmission member

30‧‧‧Abrasive grain supply mechanism

31‧‧‧ Storage tank

32‧‧‧ Moving out

32a‧‧‧Export

40‧‧‧sucking mechanism

41‧‧‧Sucking Department

42‧‧‧dust collector

43‧‧‧Hose

43a‧‧‧First hose

43b‧‧‧second hose

50‧‧‧ screening agency

A‧‧‧ Accelerated area

F (F1, F2, F3) ‧ ‧ the behavior of abrasive particles

G‧‧‧ abrasive grain

S01~S09‧‧‧Steps

W‧‧‧Workpiece

Fig. 1 is a schematic view for explaining a deburring device used in an embodiment of the present invention.

Fig. 2 is a schematic view for explaining the mechanism of removal of burrs in the embodiment of the present invention.

Fig. 3 is a flow chart showing the steps of removing the burrs in the embodiment of the present invention.

An example of the deburring device and the method for removing the burr of the present invention will be described with reference to the drawings. In the following description, as the workpiece (treated product), a molded body in which the raw material powder is molded and solidified, that is, in a state before being sintered to form a sintered body, is used. In the following description, the directions of the up, down, left, and right directions refer to the directions in the drawings unless otherwise specified. Furthermore, the present invention is not limited to the configuration of the embodiment, and can be appropriately changed as needed.

As shown in FIG. 1, the deburring device 01 used in the present embodiment includes a processing container 10, a stirring mechanism 20, an abrasive grain supply mechanism 30, a suction mechanism 40, and a screening mechanism 50.

The processing container 10 is a member for accommodating the workpiece W. The workpiece W is a processed article, for example, a molded body of an electronic component. Examples of the electronic component include a capacitor, a resistor, an inductor, a varistor, a band pass filter, and a piezoelectric element. The workpiece W may be a molded body obtained by molding a raw material powder or molding a raw material powder and then calcining the raw material powder. The workpiece W may also be a ceramic or magnetic material formed by a powder molding method. The shape of the workpiece W may be a rectangular parallelepiped, and one side of the workpiece W may be, for example, about 100 to 1600 μm. The processing container 10 is provided with a processing disk 11. The processing disk 11 has a first surface 11a (mounting surface) on which the workpiece W is placed, and a second surface 11b which is a surface opposite to the first surface 11a. The processing disk 11 has a plurality of openings, and the openings have air permeability and can pass the abrasive grains, but can stay on the first surface 11a side without passing the workpiece W. Specifically, the processing disk 11 is provided with a plurality of through holes penetrating through the processing disk 11 from the first surface 11 a toward the second surface 11 b. Each of the plurality of through holes has a size that allows the abrasive grains G to pass therethrough and cannot pass the workpiece W. The processing disk 11 may be, for example, a disk formed in a mesh shape, a perforated metal, or a disk provided with a plurality of slits. Further, the shape of the processing disk 11 is not particularly limited.

The processing container 10 of the present embodiment includes a processing disk 11 in the shape of a disk having a mesh shape. And a frame 12 fixed to the outer edge portion of the processing disk 11. The frame 12 surrounds at least the periphery of the processing disk 11 in at least the first surface 11a of the processing disk 11. In other words, the processing container 10 of the present embodiment has a cylindrical shape in which the upper side (the first surface 11a side) of the processing disk 11 is opened.

The stirring mechanism 20 is connected to the processing container 10 so as to stir a plurality of workpieces W accommodated (provided) in the processing container 10 in a flowing state. The configuration of the stirring mechanism 20 is not particularly limited as long as the workpiece W can be stirred. For example, the agitation mechanism 20 may be configured to rotate the processing container 10 or to vibrate the processing container 10. As the stirring mechanism 20, other known configurations can also be used. In the present embodiment, the agitation mechanism 20 rotates the processing container 10 with the center of the plane of the processing disk 11 as the axis. Specifically, the stirring mechanism 20 includes a holding member 21 and a rotating mechanism 22 . The holding member 21 rotatably holds the processing container 10 in a state where the processing container 10 is inclined at a specific inclination angle α.

The rotating mechanism 22 is a mechanism that rotates the processing container 10 at a specific speed. The rotation mechanism 22 includes a motor 22a that generates a rotational force, and a rotational force transmitting member 22b that transmits the rotational force of the motor 22a to the processing container 10.

The abrasive grain supply mechanism 30 is a mechanism for feeding the abrasive grains G toward the workpiece W. The abrasive grain supply mechanism 30 includes a storage tank 31 and a carry-out portion 32. The storage tank 31 is a tank for storing the abrasive grains G. A discharge port 32a is provided in the carry-out portion 32. The carry-out portion 32 is disposed such that the discharge port 32a is positioned above the first surface 11a of the processing disk 11. The carry-out portion 32 may be configured to discharge the abrasive grains G in the storage tank 31 (funnel) from the discharge port 32a in a quantitative manner. The carry-out portion 32 may include, for example, a transfer screw and a groove in which the transfer screw is housed, and the polishing grain G in the storage tank 31 may be formed to advance toward the discharge port 32a provided in the groove. Further, the carry-out portion 32 may include a disk-shaped chassis and a squeegee (not shown) that is horizontally rotated about the center of the chassis. In this case, the carry-out portion 32 may be configured such that a predetermined amount of the abrasive grains G are deposited on the chassis by the angle of repose by slightly lowering the bottom surface of the storage tank 31 from the chassis, and the scraper is used to dispose the same. It is scraped toward the discharge port 32a. As the carry-out unit 32, other known configurations can be used. In the present embodiment, the carry-out unit 32 has the former The composition.

The suction mechanism 40 has both a function of accelerating the abrasive grains G and a function of suction. The suction mechanism 40 is provided with a hose 43 and a dust collector 42. One end surface of the hose 43 (in the present embodiment, the suction portion 41) is disposed below the second surface 11b of the processing disk 11, and is spaced apart from the second surface 11b. The dust collector 42 is coupled to the hose 43.

The screening mechanism 50 is a mechanism for screening abrasive particles that can be reused from dust. Further, the screening mechanism 50 is disposed in the middle of the path from the suction unit 41 toward the dust collector 42. That is, the first hose 43a that forms the suction portion 41 on one end surface is coupled to the screening mechanism 50, and the screening mechanism 50 is coupled to the dust collector 42 by the second hose 43b. The screening mechanism 50 is a mechanism for separating dust into reusable abrasive grains and other fine particles (abrasive grains which generate cracks or leaks, and cutting powder of a workpiece which is produced by removal of burrs). The screening mechanism 50 can also be constructed by using the difference in the specific gravity of the dust and the classification of the airflow. As the screening means 50, for example, a cyclone separator, a centrifugal classifier, or other known structures may be used. In the present embodiment, a cyclone separator is used as the screening mechanism 50, and the bottom of the cyclone separator is coupled to the storage tank 31.

Next, a method of removing the burr will be described with reference to FIGS. 2 and 3.

(S01: preparation step)

A deburring device 01 and a plurality of workpieces W are prepared. The abrasive grains G are previously charged into the storage tank 31 shown in Fig. 1. The material of the abrasive grain G used in the present embodiment can be appropriately selected in accordance with the material and shape of the workpiece W and the purpose of processing. For example, the abrasive grains G may be derived from metal or non-metal particles (beads, sand grains, and steel wire particles), ceramic-based particles (Al ₂ O ₃ , SiC, and ZrO _{2 ,} etc.), natural stone particles (mound, vermiculite). And diamonds, etc., plant particles (walnut shell, peach core, and apricot core), and resin particles (nylon, melamine, urea, etc.) are selected.

Further, the particle size of the abrasive grains G can be appropriately selected in accordance with the material and shape of the workpiece W and the purpose of processing. However, the particle size of the abrasive particles G must be such that the processing container 10 can be made. The opening (through hole) is selected by the diameter. For example, when ceramic particles are used as the abrasive grains G, the particle size of the abrasive grains G is J220 (Japanese Indusrial Standards) R6001; 1998, and the particle size is F220 or #240 or more and 1000 or less. It is selected so that the diameter of the opening (through hole) of the processing container 10 can pass.

(S02: Step of accommodating the workpiece in the processing container)

A plurality of workpieces W are housed (arranged) in the processing container 10 by placing a plurality of workpieces W on the first surface 11a of the processing disk 11. The capacity of the workpiece W is appropriately selected in accordance with the properties of the workpiece W and the size of the processing container 10, so that the workpiece W can be held by the processing container 10, and the workpiece W can be satisfactorily stirred and flowed. In addition, in FIG. 2, one workpiece W is described for convenience.

(S03: Step of stirring the workpiece)

The motor 22a is actuated to rotate the processing vessel 10. The workpiece W housed in the processing container 10 moves along the frame 12 following the rotation of the processing container 10. Since the processing container 10 is held obliquely, the workpiece W is added with a centrifugal force in the direction toward the frame 12 and a component of gravity along the processing disk 11. When the workpiece W moves (rises) to a specific position, the component force of gravity becomes larger than the centrifugal force, so that the workpiece W is separated from the casing 12 and falls downward along the processing disk 11. In this manner, the movement and the falling of the workpiece W are continuously performed, whereby the plurality of workpieces W are in a flowing state and are stirred. In order to achieve this flow state, the inclination angle α of the processing container 10 may be set to 30 to 70 degrees or 40 to 60 degrees with respect to the horizontal plane. If the inclination angle α of the processing container 10 is too small, the effect of promoting the fluidization of gravity is small. When the inclination angle α of the processing container 10 is too large, the component force of gravity is excessively large with respect to the centrifugal force, so that it is difficult to follow the rotation of the processing container 10 to move the workpiece W.

Further, if the rotational speed of the processing container 10 is too large, the centrifugal force becomes too strong, so that it is difficult to drop the workpiece W by the component force of gravity. On the contrary, if the rotational speed of the processing container 10 is too small, the centrifugal force becomes too weak, so that it is difficult to make the workpiece W by the rotation of the processing container 10. mobile. In either case, the workpiece W cannot be satisfactorily flowed. In order to stir a plurality of workpieces W in a flowing state, the rotation speed of the processing vessel 10 may be set to 5 to 50% of the critical rotation speed, or may be 10 to 30%. The critical rotational speed is the speed at which the centrifugal force of the workpiece W is greater than the component force of gravity when the rotational speed of the processing container 10 is increased, and the workpiece W does not fall and rotates together with the casing 12. When the rotation speed of the processing container 10 is too slow, the influence of gravity with respect to the centrifugal force is excessively large, so that the movement of the workpiece W along the frame 12 of the processing container 10 cannot be sufficiently performed, and as a result, the flow of the workpiece W falls. Not fully implemented. When the rotation speed of the processing container 10 is too fast, the gravity is too small with respect to the centrifugal force, so that the workpiece W that is pressed against the frame 12 of the processing container 10 does not fall, and the flow cannot be sufficiently performed.

Further, by stirring the workpiece W in a flowing state, the workpieces W collide with each other, and the fixing force of the burrs formed on the workpiece W is weakened, whereby the burrs are easily removed from the workpiece W.

(S04: Step of generating airflow)

When the dust collector 42 is actuated, an air flow from the first surface 11a toward the second surface 11b is generated in the vicinity of the processing disk 11.

(S05: Rectification step)

By rectifying the flow of the gas stream, it is possible to intentionally change (control) the manner in which the abrasive grain G collides or contacts the workpiece W. This step can be performed, for example, by changing the position and size of the suction unit 41, the suction flow rate of the dust collector 42, and the like. Further, as described below, since the speed of the abrasive grains G when the abrasive grains G collide or contact with the workpiece W is extremely low, the state in which the abrasive grains G collide with or contact with the workpiece W can be easily changed by the rectifying step (S05). kind. Furthermore, the rectification step S05 can also be omitted.

(S06: Step of inputting abrasive grains)

When the abrasive grain supply mechanism 30 is actuated, the abrasive grains G loaded in the storage tank 31 are discharged from the discharge port 32a and are discharged toward the workpiece W (in the case of the present embodiment, it is dropped). drop). The speed of the abrasive grains G in the direction toward the workpiece W when the abrasive grains G are discharged from the discharge port 32a is 0 m/sec or a very small speed, and even if the abrasive grains G are freely dropped, no external force such as suction force is applied. When the workpiece W collides or contacts, the burr of the workpiece W can also be removed.

(S07: Step of accelerating the abrasive grains)

The airflow generated in the step (S04) of generating the air granules discharged from the discharge port 32a is freely dropped to reach the acceleration region A as shown in FIG. 2 (the region where the airflow is generated on the side of the first surface 11a) ). The abrasive grains G that have reached the acceleration region A are accelerated toward the suction portion 41 so that the speed at which the workpiece W collides or comes into contact with the workpiece W. This specific speed may also be a speed at which the burrs of the workpiece W can be removed well without causing damage to the workpiece W and the penetration of the abrasive grains G. For example, when the Vickers hardness of the workpiece W (specified by JIS Z2244; 2009) is 3 to 200 Hv (test force is 0.2 N), the specific speed may be 5 to 30 m/sec or 10 to 20m/sec. This particular speed is a very low speed for burr removal by contact or collision of abrasive particles, which was not possible with previous methods of removing burrs. For example, in the grinding by the jet processing apparatus, the injection pressure is a high pressure (for example, 0.2 MPa or more), so that a very slow speed such as the above-described specific speed cannot be achieved. It is assumed that when the injection pressure is extremely low in order to set the speed of the abrasive grains to the specific speed, the injection amount of the spray material from the nozzle is unstable, so that the degree of completion of the workpiece is uneven. According to the burr removal method of the present embodiment, the speed of the abrasive grains G when the abrasive grains G collide with or contact with the workpiece W can be made at a very low speed, so that the workpiece W can be burred with the abrasive grains G at a very low speed. Remove. The adjustment of the speed can be performed by adjusting the suction flow rate of the dust collector 42 and changing the size and shape of the suction portion 41. The suction flow rate of the dust collector 42 can be adjusted, for example, by changing the number of revolutions of the motor built in the dust collector 42, or by providing a damper for sucking outside air in the hose 43, adjusting the opening degree of the damper, etc. And proceed.

(S08: Step of removing the burr of the workpiece)

The abrasive grains G that have reached the acceleration region A are accelerated toward the suction portion 41 while being accelerated. Arrives at the machined surface of the workpiece W. Then, after the abrasive grain G collides with or comes into contact with the workpiece W, it proceeds further toward the suction portion 41. The behavior F shown in Fig. 2 indicates the behavior of the abrasive grains G. An example in which the abrasive grains G collide or contact with the workpiece W will be described as the behaviors F1, F2, and F3.

Behavior F1: After the abrasive grain G collides linearly with the burr of the workpiece W, it rebounds. The burr is removed by the impact force of the abrasive grain G when it collides with the burr.

Behavior F2: After the abrasive grain G collides with the upper surface of the workpiece W, it proceeds along the upper surface. The burr is removed by the impact force when the abrasive grain G collides with the workpiece W and the frictional force of the abrasive grain G as it advances along the upper surface.

Behavior F3: The abrasive grain G advances along the angular portion of the workpiece W. The burr is removed by at least one of an impact force when the abrasive grain G collides with the edge portion of the workpiece W or a frictional force when passing through the edge portion.

(S09: Step of recovering abrasive grains)

The abrasive grains G that collide or contact with the workpiece W are moved to the second surface 11b side by the processing disk 11. The abrasive grains G moved to the side of the second surface 11b are sucked from the suction portion 41 by the dust collector 42. At this time, the fine particles are also sucked from the suction portion 41 through the processing disk 11. The dust of the abrasive grains G and the fine particles is transferred to the screening mechanism 50 through the first hose 43a. When the screening mechanism 50 is a cyclone separator, the dust introduced into the upper portion of the cyclone separator along the wall surface is spirally dropped. In the process, the fine particles, which are light-weight particles, float upward, and are collected by the dust collector 42 through a second hose 43b connected to the top of the cyclone. On the other hand, the reusable abrasive grains G, which are heavy mass particles, move toward the bottom of the screening mechanism 50, and are stored in the storage tank 31 connected to the bottom of the screening mechanism 50. This abrasive grain G is again supplied from the discharge port 32a toward the workpiece W.

As described above, the discharge port 32a in the abrasive grain supply mechanism 30 disposed on the first surface 11a side is loaded, and the abrasive grains G and the workpiece W are accelerated by the suction force generated by the dust collector 42 to a specific speed. Collision or contact, thereby removing the burrs of the workpiece W. Touching the workpiece W The abrasive grains G after the collision or contact are sucked by the suction portion 41 disposed on the second surface 11b side. Thereby, the abrasive grain G is not scattered to the surroundings as in the prior art method of removing the burrs, that is, the spray processing method. Further, since the speed of the abrasive grains G when the abrasive grains G collide or come into contact with the workpiece W is very slow, even if the burrs of the workpiece W having a relatively low hardness are removed, the workpiece W is not damaged. The burr of the workpiece W can be removed well. For example, when a molded body constituting an electronic component is used as the workpiece W, an electronic component having high reliability can be manufactured.

Here, the thickness of the processing disk 11 may also be 30 to 100 μm. If the thickness of the processing disk 11 is too thin, there is a possibility that the processing disk 11 is broken during the removal of the burrs. When the thickness of the processing disk 11 is too thick, the distance between the abrasive grains G and the processing disk 11 is too long, so that the possibility of clogging becomes high, or the abrasive grains G cannot be sufficiently accelerated in the acceleration region A by pressure loss. Further, the radius (angular radius) of the corner formed by the first surface 11a of the processing disk 11 and the frame 12 may be 0.5 to 5.0 mm. That is, the edge portion formed by the first surface 11a of the processing disk 11 and the frame 12 can be processed into an R surface having a radius of 0.5 to 5.0 mm. If the angular radius is too small, the possibility that the workpiece W is sandwiched by the angular portion becomes high, and if the angular radius is too large, the workpiece W hardly stays in the processing container 10.

Further, in the present embodiment, two values of "pumping ratio" and "passing ratio" are defined. Here, the "pumping ratio" means the volume (volume/second) of the abrasive grains injected from the abrasive grain supply mechanism 30 per unit time with respect to the suction flow rate (volume drawn by the suction mechanism 40 per unit time). / sec) ratio. The "passing ratio" means the amount of the abrasive grains G (g/s) which reaches the second surface 11b side per unit time with respect to the grinding of the plurality of workpieces W from the first surface 11a side toward the flow state per unit time. The ratio of the amount of granule G (g/s). Here, the amount (gram) of the abrasive grains G that are input from the first surface 11a side toward the plurality of workpieces W in the flow state refers to 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 surface 11b means the weight of the abrasive grains G sucked by the suction mechanism 40 through the processing disk 11.

The suction ratio may also be in the range of 10 to 50% by volume. When the suction ratio is too low, the amount of the abrasive grains G discharged from the discharge port 32a with respect to the suction flow rate sucked by the suction mechanism 40 is small, and the burrs of the plurality of workpieces W cannot be sufficiently removed. Further, when the suction ratio is too high, the amount of the abrasive grains G discharged from the discharge port 32a with respect to the suction flow rate sucked by the suction mechanism 40 is large, and in the acceleration region A, the abrasive grains G cannot be sufficiently obtained. Accelerate to a speed at which the burrs of the workpiece W can be removed. Further, the abrasive grains G and the fine particles are scattered to the surroundings.

The longer the distance between the plurality of workpieces W in the processing vessel 10, the longer the abrasive grain G stays between the plurality of workpieces W, and the lower the pass ratio. The pass ratio can also be in the range of 80 to 95% by weight. When the ratio is too high, the distance between the plurality of workpieces W by the abrasive grains G is too short. Therefore, the frequency at which the abrasive grains G come into contact with the workpiece W becomes low, and the burrs of the workpiece W cannot be satisfactorily removed. Further, when the ratio is too low, the distance between the plurality of workpieces W by the abrasive grains G is too long, so that the polishing particles G are not accelerated by the air flow and become longer between the plurality of workpieces W, which hinders the burr of the workpiece W. Removal.

Next, the result of removing the burrs of the workpiece W by the above-described deburring device will be described. Here, the following two types are selected as the workpiece W, and the removal of the burrs of the corner portions is made for processing.

Workpiece A: The workpiece A is a molded article before firing of a ceramic formed by compression molding of a composite material (SiC/Al ₂ O ₃ ). The size of the workpiece A was 0.5 mm × 0.5 mm × 1.0 mm, and the Vickers hardness of the workpiece A was Hv 100.

Workpiece B: The workpiece B is a molded article before firing of a ceramic formed by compression molding of a ferrite powder having a spinel crystal structure. 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 Hv20.

As the device, the deburring device of the above embodiment is used. Moreover, as a comparative example, the spray processing apparatus of the prior art (renovation of the cylindrical type squirting apparatus of the MY-30C type manufactured by Shinto Industries Co., Ltd.) was used.

In the present embodiment, the burrs of the workpiece W are removed by the abrasive grains A and the abrasive grains B, respectively. The abrasive grain A was an alumina-based particle having an average particle diameter of 18 μm (WA #800, manufactured by Shinto Industries Co., Ltd.), and the apparent density of the abrasive grain A was 4.0 g/cm ³ . The abrasive grain B was a particle having an average particle diameter of 14 μm ferrite, and the apparent density of the abrasive grain B was 2.5 g/cm ³ .

After the deburring device or the jetting device was operated for 30 minutes to remove the burrs of the workpiece W, the processing state of the workpiece W was evaluated. The evaluation of the processing state was carried out by observing the workpiece to be observed by a microscope (VHX-2000, manufactured by KEYENCE Co., Ltd.). The workpiece to be observed is a workpiece in which a workpiece of one-fifth of the volume of the processing container is stored in the processing container to remove the burr of the workpiece (after the operation of the device is completed) from the workpiece of the full amount. The evaluation criteria of the processing state are as follows.

○‧‧‧In all workpieces, the burrs were removed and there was no damage to the workpiece (broken and missing, and the penetration of the abrasive particles).

△‧‧‧ There are workpieces with slight burrs remaining, but all workpieces are not damaged.

×‧‧‧More burrs were not removed. Or there is a damaged workpiece.

Further, after the burr of the workpiece W is removed by the deburring device of the above-described embodiment, the periphery of the processing container 10 is observed. The periphery of the cylinder was observed after the burr of the workpiece W was removed by the jet processing apparatus. In addition, when the adhesion of the abrasive grains is not confirmed in the vicinity of the processing container 10 or the periphery of the cylinder, the evaluation of the scattering of the abrasive grains is "○", and the abrasive grains are confirmed around the periphery of the processing container 10 or around the cylinder. In the case of adhesion, the evaluation of the scattering of the abrasive grains is set to "x". Similarly, when the workpiece is not confirmed around the processing container 10 or around the cylinder, the evaluation of the scattering of the workpiece is "○", and the workpiece is confirmed when the workpiece is in the vicinity of the processing container 10 or around the cylinder. The evaluation of the scattering is set to "X".

The results of the above evaluation of each condition are shown in Table 1. With respect to the item of the apparatus of Table 1, the "inclination angle" is as shown in Fig. 1, and the deburring device of the above embodiment shows the inclination angle α (°) of the processing container 10 with respect to the horizontal plane, and represents the circle in the squirting apparatus. The angle of inclination of the barrel relative to the horizontal plane. Also, "rotational speed" means relative to the critical rotational speed The ratio of the rotational speed of the degree (%). In addition, in the "speed" of the abrasive grains, the result of measuring the granule speed of the abrasive grains before the contact with the workpiece W under each condition is measured in advance using a flow rate measuring system (PIV system manufactured by FLOWTECH RESEARCH Co., Ltd.). Further, the "thickness" indicates the thickness (μm) of the processing disk 11, and the "angular radius" indicates the size (mm) of the radius of the edge formed by the first surface 11a of the processing disk 11 and the frame 12.

The suction ratio is changed by changing the amount (g/sec) of the abrasive grains which are input from the first surface 11a side toward the flow state of the plurality of workpieces W.

The passing ratio is calculated by measuring in advance the amount of the abrasive grains to be fed from the first surface 11a side toward the flow state and the amount of the abrasive grains per unit time to the second surface 11b side. Specifically, the passing ratio is calculated by measuring the following (1) and (2) when the deburring device is operated for one minute by using the burr-free workpiece A as a workpiece.

(1) The amount of the abrasive grains discharged from the discharge port 32a of the abrasive grain supply mechanism 30 (the amount of the abrasive grains input from the first surface 11a side toward the flow state of the plurality of workpieces W per unit time)

(2) The amount of abrasive grains sucked by the suction mechanism 40 through the plurality of workpieces W and the processing disk 11 (the amount of abrasive grains reaching the second surface 11b side per unit time)

Here, the burned product of the burr-free workpiece A is used as the workpiece W in order to prevent the cutting powder such as the burr of the workpiece W from being generated.

First, in the deburring device of the above embodiment, the inclination angle of the processing container 10 is 45°, the rotation speed is 30%, the thickness of the processing disk 11 is 40 μm, and the angular radius of the processing disk 11 is 1.0 mm. The conditions of the abrasive grain rate of 15 m/sec and the suction ratio of 30% were set as the reference conditions. In the deburring device of the above embodiment, the suction ratio in the reference condition is changed between 5 and 60% by volume, and the burr of the workpiece A is removed by using the abrasive particles A (Examples 1 to 5). Further, in the deburring device of the above-described embodiment, the suction ratio in the reference condition is changed between 5 and 60% by volume, and the burr of the workpiece B is removed by using the abrasive particles B (Examples 17 to 21). Regarding the suction ratio of 10 to 50% by volume, the evaluation of the state of the workpiece regardless of the type of the workpiece was "○" or "△" (Examples 1 to 3 and Examples 17 to 19). On the other hand, when the suction ratio is out of the range of 10 to 50% by volume, the evaluation of the processing state is "x" (Examples 4 and 5 and Examples 20 and 21).

Then, any one of the "tilt speed", "rotation speed", "speed", "thickness", and "angular radius" is sequentially changed from the above-mentioned reference conditions, and the burrs of the workpiece A and the workpiece B are removed (implementation) Examples 6 to 15 and Examples 22 to 31). Further, the removal of the burrs of the workpiece A uses the abrasive grains A, and the removal of the burrs of the workpiece B uses the abrasive grains B. As a result, the evaluation of the processing state was "○" or "△". In the embodiment in which the evaluation state of the processing state is "△", the burr is slightly left in the workpiece, and the workpiece is not damaged. Therefore, the processing time can be changed to "○" by displaying the processing time longer. The situation.

In the above-described Examples 1 to 15 and Examples 17 to 31, the examples in which the evaluation of the processing state was "○" or "△" (Examples 1 to 3, Examples 6 to 19, and Examples 22 to 31) The passage ratio is 80 to 95% by weight. Therefore, the burr removal can be performed favorably in the ratio of the passage in this range.

In the deburring device of the above-described embodiment, the ferrite-based abrasive grains B which are materials different from the alumina material of the workpiece A are used, and the burrs of the workpiece A are removed under the above-described reference conditions. As a result, alumina is removed. Harder than ferrite, so the abrasive particles are not The burr can be removed well by piercing the workpiece (Example 16). On the other hand, the abrasive grain A of the alumina which is a material different from the material of the workpiece B, that is, the ferrite material, was used to remove the burr of the workpiece B under the above-mentioned standard conditions. Example 32). The reason is considered to be that ferrite is softer than alumina. Therefore, it has been found that when the burr of the ferrite material is removed, the abrasive grains prepared by using ferrite as the material of the same material or the abrasive grains made of a softer material than the ferrite can well remove the burrs. .

Further, in Examples 1 to 32, as a result of observing the periphery of the processing container 10 after the burr removal process, the adhesion of the abrasive grains and the dropping of the workpiece W were not confirmed around the processing container 10. Thereby, it is judged that the deburring device of the above embodiment does not scatter the abrasive grains to the surroundings, and does not blow the workpiece, and the burr can be removed from the workpiece W.

On the other hand, when the burr removal processing of the workpiece W is performed by the squeegee processing apparatus, the burr of the workpiece W is removed, but the damage of the workpiece W is caused, and the evaluation of the processing state is "x" (Comparative Example 1) And Comparative Example 2). In addition, when the burr was removed and the periphery of the cylinder, that is, the processing chamber, was observed, the adhesion of the abrasive grains was confirmed on the wall surface of the blast processing chamber, and the evaluation of the scattering of the abrasive grains was "x". Further, when the classification mechanism connected to the jet processing apparatus is confirmed, it is confirmed that the workpiece W is mixed. It indicates that the workpiece is blown away from the cylinder in the burr removal process in accordance with the properties of the workpiece W.

[Industrial availability]

According to the above embodiment, a new method of removing burrs can be provided. In the method for removing the burr, the abrasive particles are accelerated to a specific speed by a gas flow and the kinetic energy suitable for the removal of the burr is imparted to the abrasive particles, and the abrasive particles having the kinetic energy collide or contact with the workpiece. Remove the burrs from the workpiece. Further, the entire amount of the abrasive grains and the fine particles is recovered by the suction member. Thereby, the following effects are obtained.

(1) The abrasive grains do not scatter to the surroundings.

(2) The workpiece does not fly out of the processing container during the burr removal process.

(3) The speed of the abrasive grains is about 10 to 30 m/sec, and the burrs of the workpiece can be removed by the abrasive grains having a very low speed, so that the workpieces before the sintering can be formed in a particularly good manner. Removal of burrs.

Further, the method of removing the burr of one embodiment can be favorably applied to a workpiece having a relatively low hardness (for example, copper or aluminum).

01‧‧‧Deburring device

10‧‧‧Processing containers

11‧‧‧Processing tray

11a‧‧‧ first side

11b‧‧‧ second side

12‧‧‧ frame

20‧‧‧Agitating mechanism

21‧‧‧ Keeping components

22‧‧‧Rotating mechanism

22a‧‧‧Motor

22b‧‧‧Rotary force transmission member

30‧‧‧Abrasive grain supply mechanism

31‧‧‧ Storage tank

32‧‧‧ Moving out

32a‧‧‧Export

40‧‧‧sucking mechanism

41‧‧‧Sucking Department

42‧‧‧dust collector

43‧‧‧Hose

43a‧‧‧First hose

43b‧‧‧second hose

50‧‧‧ screening agency

G‧‧‧ abrasive grain

W‧‧‧Workpiece

Claims (18)

A method for removing burrs, which is a burr remover of a processed article, and comprising the steps of: preparing a deburring device and a plurality of processed articles, the deburring device comprising a processing container and a suction mechanism for generating a suction force; The plurality of processed articles are placed in the processing container; the plurality of processed articles disposed in the processing container are stirred; and the plurality of processed articles placed in the agitated state are used for the polishing particles The airflow generated by the actuation of the suction mechanism is accelerated to a specific speed, and the abrasive grains are brought into contact with or collided with the plurality of processed articles to remove the burrs of the plurality of processed articles. The method for removing burrs of claim 1, wherein each of the plurality of processed articles is obtained by molding a raw material powder or calcining the raw material powder. The method of removing burrs of claim 2, wherein each of the plurality of processed articles is a ceramic or magnetic material formed by a powder molding method. The method for removing burrs according to any one of claims 1 to 3, wherein, in the step of stirring the plurality of processed articles, the plurality of processed articles disposed in the processing container are in a flowing state The plurality of processed articles are stirred. The method of removing a burr according to any one of claims 1 to 4, wherein the processing container includes: a processing disk having a first surface and a surface opposite to the first surface, that is, a second surface; and a frame body Surrounding the processing disk in the first surface of the processing disk a plurality of through holes penetrating through the processing disk in a direction from the first surface toward the second surface, wherein each of the plurality of through holes has a passage for the polishing particles to be supplied In the step of providing the plurality of processed articles in the processing container by the size of each of the plurality of processed articles, the plurality of processed articles are placed on the first surface. The method for removing burrs according to claim 5, wherein the processing disk has a thickness of 30 to 100 μm, and the first surface of the processing disk and the edge portion formed by the frame are processed into an R surface having a radius of 0.5 to 5.0 mm. The method of removing burrs according to claim 5 or 6, wherein the suction mechanism is disposed on the second surface side, and the air flow is an air flow from the first surface toward the second surface. The method for removing burrs according to any one of claims 5 to 7, further comprising the step of recovering the abrasive particles, wherein the polishing particles are from the first surface in the step of removing the burrs of the plurality of processed articles The side is directed toward the plurality of processed articles, and in the step of recovering the abrasive grains, the abrasive grains reaching the second surface are sucked by the suction mechanism and recovered. The method for removing burrs according to any one of claims 5 to 8, wherein the amount of the abrasive grains reaching the second surface per unit time is a plurality of the above-mentioned plurality of being agitated from the first surface side with respect to the unit surface time. The ratio of the amount of the above-mentioned abrasive grains to which the treated product is charged is 80 to 95% by weight. The method for removing burrs according to any one of claims 5 to 9, wherein the body of the abrasive grains which is supplied from the first face side toward the plurality of processed articles per unit time The ratio of the suction flow rate by the suction mechanism per unit time is 10 to 50% by volume. The method for removing burrs according to any one of claims 1 to 10, wherein in the step of stirring the plurality of processed articles, the squeezing force of the burrs is changed by stirring the plurality of processed articles weak. The method for removing burrs according to any one of claims 1 to 11, wherein the abrasive grains have a velocity of 5 to 30 m/sec when the abrasive grains are in contact with or collided with the plurality of processed articles. The method for removing burrs according to any one of claims 1 to 12, further comprising the step of rectifying said gas stream, wherein said refining step controls said abrasive grains and said plurality of particles in said rectifying step The contact or collision of the treated product. The method for removing burrs according to any one of claims 1 to 13, wherein in the step of stirring the plurality of processed articles, the processing container is rotated by arranging the processing container at a specific angle, The plurality of processed articles are stirred. The method of removing burrs of claim 14, wherein the specific angle is 30 to 70 degrees. The method for removing burrs of claim 14 or 15, wherein the processing vessel has a rotational speed of 5 to 50% of the critical rotational speed. The method of removing burrs according to any one of claims 1 to 16, wherein one of the sides of the plurality of processed articles is 100 to 1600 μm. A deburring device for removing a burr of a processed article, and comprising: a processing container for arranging a plurality of processed articles; and a stirring mechanism for processing the plurality of the plurality of processed containers disposed in the processing container Product Stirring; an abrasive grain supply mechanism that applies the abrasive grains to the plurality of processed articles in a state of being stirred by the stirring mechanism; and a suction mechanism that is oriented by the suction force from the abrasive grain supply mechanism An air flow is generated in a direction of the processing container, and the suction mechanism accelerates the polishing particles introduced into the plurality of processed articles by the polishing grain supply mechanism to a specific speed by the air flow, and accelerates the polishing. The granules are in contact with or collided with the plurality of processed articles, whereby the burrs of the plurality of processed articles are removed.