JPWO2016092975A1 - Deburring device and deburring method - Google Patents

Abstract

The method for removing burrs includes a deburring device including a processing container and a suction mechanism that generates a suction force, a step of preparing a plurality of articles to be processed, and a step of setting a plurality of articles to be processed in a processing container. A step of stirring a plurality of articles to be processed set in a processing container, and abrasive grains thrown toward the plurality of articles to be processed in a state of being agitated by an air flow generated by the operation of a suction mechanism. Accelerating the speed and bringing the abrasive grains into contact with or colliding with a plurality of articles to be processed to remove burrs from the plurality of articles to be treated.

Description

  The present disclosure relates to a deburring apparatus and a deburring method for removing deburring of a workpiece.

  Electronic parts are widely used in many electronic devices such as smartphones, tablet terminals, and portable music players. In particular, in recent years, smaller electronic components have been desired due to downsizing of electronic devices.

  As these electronic parts, raw powders of hard and brittle materials such as ceramics or magnetic materials are molded by a pressure molding method, a doctor blade method, an injection molding method or the like and then fired. If there are burrs in the molded parts that make up this electronic component, for example, it may cause performance degradation of electronic equipment due to burrs missing in the mounting process by an automatic mounting machine, and mounting defects due to burrs. Removal is performed.

  As a method for removing burrs from a molded body constituting an electronic component, Patent Document 1 discloses a method for removing burrs by a wet barrel polishing method. Patent Document 1 discloses a method of forming a green sheet by forming a paste containing a raw material into a sheet, and removing burrs on a green chip obtained by cutting the green sheet by wet barrel polishing. ing. Since the wet barrel polishing method is a polishing method having a relatively high polishing ability, depending on the strength of the molded body, it is excessively polished and affects the dimensional accuracy of the electronic component. Further, since it is necessary to treat the waste water generated by polishing and to dry the molded body after polishing, the manufacturing cost increases.

  As another method of removing burrs from the molded body constituting the electronic component, a method using an air blast device is conceivable (for example, described in paragraph 0002 of Patent Document 2). In general, an air blasting apparatus injects abrasive grains onto a workpiece as a solid-gas two-phase flow together with compressed air having a very high pressure of 0.2 MPa or more. For this reason, when removing the burr | flash of a small workpiece | work like an electronic component by grinding | polishing, workpiece | work itself disperses around by this solid-gas two-phase flow. In addition, the method using an air blasting device has a higher polishing power than the barrel polishing method described above, and therefore there is a possibility that defects such as cracking and chipping may occur depending on the strength of the workpiece.

JP 2008-227314 A JP 2010-188470 A

  In the present technical field, a new deburring device and a deburring method for removing deburring of a workpiece are desired.

In one aspect of the present invention, a method for removing burrs that removes burrs from an object to be processed is provided. This burr removal method includes the following steps (1) to (4).
(1) A step of preparing a deburring device including a processing container and a suction mechanism that generates a suction force, and a plurality of articles to be processed.
(2) A step of setting a plurality of objects to be processed in the processing container.
(3) A step of stirring a plurality of articles to be processed set in a processing container.
(4) The airflow generated by the operation of the suction mechanism accelerates the abrasive grains thrown toward the plurality of articles to be agitated to a predetermined speed, and the abrasive grains are made to the plural articles to be treated. A step of removing burrs from a plurality of workpieces by contact or collision.

  According to the method for removing burrs according to one aspect, the abrasive grains thrown toward the object to be processed are caused to flow at a predetermined speed (in one embodiment, the abrasive grains have a plurality of abrasive grains by the air flow generated by the operation of the suction mechanism. The speed of the abrasive grains when contacting or colliding with the treated product is accelerated to 5 to 30 m / sec). Due to this acceleration, the abrasive grains have kinetic energy suitable for removing burrs, so that when the abrasive grains contact or collide with the workpiece, the workpiece is not cut excessively. The burr can be removed from the product. At this time, since a plurality of products to be processed set in the processing container are agitated, burrs can be uniformly removed from all the products to be processed. Here, “injection of abrasive grains” simply means that abrasive grains are supplied to an article to be processed without an initial speed, or abrasive grains are supplied to an article to be processed at a very low initial speed. This means that it is different from spraying or projecting abrasive grains toward an article to be processed as in a blast processing apparatus. For example, the abrasive grains may be supplied to the object to be treated by free-falling the abrasive grains, or the abrasive grains may be coated with a weak air flow that does not scatter around or affect the burr removal process. You may supply toward a processed product.

  In the burr removal method of one embodiment, each of the plurality of articles to be processed may be obtained by molding raw material powder or by calcining after molding the raw material powder. For example, a molded body formed by molding raw material powder like a green chip, or a molded body calcined after molding the raw material powder, that is, a molded body in a state before being fired to form a sintered body is compared with a sintered body. The burr strength is relatively low. For this reason, a burr | flash can be removed favorably by making a molded object into the removal object of a burr | flash. Here, firing refers to heating a shaped body formed by pressurizing raw material particles, adhering adjacent raw material particles to reduce the gap between the particles, and solidifying.

  In the burr removing method of one embodiment, each of the plurality of articles to be processed may be a ceramic or magnetic material formed by a compacting method. The molding method of the article to be treated is not particularly limited, but in the article to be treated molded by the compacting method, the raw material particles adjacent to each other are not bonded by heating in the part that can be a product and the burr part. Therefore, the burr | flash which exists in a to-be-processed product can be removed especially favorably.

  In the method for removing burrs according to an embodiment, in the step of stirring the plurality of articles to be processed, the plurality of articles to be processed may be agitated by bringing the plurality of articles to be processed set in the processing container into a fluid state. . Since the products to be processed are relatively small in size (for example, one side is 100 to 1600 μm), a plurality of products to be processed can be stirred and dispersed evenly.

  In one embodiment of the burr removal method, the processing container may include a processing board and a frame. The processing board may include a first surface and a second surface that is a surface opposite to the first surface. The processing board may be provided with a plurality of through holes penetrating the processing board in a direction from the first surface to the second surface. Each of the plurality of through holes may have a size through which abrasive grains can pass and each of the plurality of articles to be processed cannot pass. The frame may surround the periphery of the processing board on the first surface of the processing board. Further, in the step of setting a plurality of products to be processed in the processing container, a plurality of products to be processed may be placed on the first surface. In this case, the article to be processed can be set in the processing container and stirred well without impairing the ability to remove burrs.

  In the burr removal method of one embodiment, the thickness of the processing board may be 30 to 100 μm, and the ridge corner formed by the first surface of the processing board and the frame body has a radius of 0.5 to 5.0 mm. You may be processed into the R surface. With this configuration, the article to be processed can be prevented from staying at the ridge corner of the processing container, or can be suppressed from being sandwiched between the members forming the processing container.

  In the burr removal method of one embodiment, the suction mechanism may be arranged on the second surface side. The airflow may be an airflow from the first surface toward the second surface. With this configuration, an air flow is generated from the first surface side to the second surface side in the vicinity of the product to be processed, that is, in the processing container, so that the burr of the product to be processed can be satisfactorily removed by this air flow. .

  The burr removal method of one embodiment may further include a step of collecting abrasive grains. In the step of removing burrs from the plurality of products to be processed, the abrasive grains may be introduced from the first surface side toward the plurality of products to be processed. In the step of collecting the abrasive grains, the abrasive grains that have reached the second surface may be collected by being sucked by a suction mechanism. Since the abrasive grains and the fine particles (these abrasive grains and fine particles are collectively referred to as “dust” hereinafter) proceed toward the suction mechanism, it is possible to prevent the dust from being scattered outside the area where the burrs are removed. The fine particles include abrasive grains in which cracks or chips have occurred, and cutting powder generated by the removal process of burrs.

  In the method for removing burrs according to one embodiment, the second surface per unit time with respect to the amount of abrasive grains charged toward a plurality of workpieces stirred from the first surface side per unit time. The amount (passing rate) of the amount of abrasive grains reached may be 80 to 95% by weight. By setting the passing ratio within this range, it is possible to suppress the frequency at which the abrasive grains abut on the article to be processed from being a certain level or more without hindering the acceleration of the abrasive grains. For this reason, the abrasive grains are accelerated well, and the burrs of the article to be processed can be removed well.

  In the burr removal method according to one embodiment, the volume of abrasive grains charged from the first surface side to the plurality of workpieces per unit time with respect to the suction flow rate sucked by the suction mechanism per unit time. The ratio (suction ratio) may be 10 to 50% by volume. By setting the suction ratio within this range, the amount of abrasive grains can be set to such an extent that burrs can be sufficiently removed without hindering the acceleration of the abrasive grains. In addition, by setting the suction ratio within the above-described range, it is possible to sufficiently suck the abrasive grains thrown toward a plurality of objects to be processed by the suction mechanism. For this reason, the abrasive grains are accelerated well, and the possibility that the abrasive grains and fine particles are scattered around can be reduced.

  In the method for removing burrs according to one embodiment, in the step of stirring a plurality of articles to be processed, the burr fixing force may be weakened by stirring the plurality of articles to be processed. When the burr | flash part in a to-be-processed product contacts another to-be-processed product and a processing container, the crack used as the starting point of fatigue failure is induced. As a result, it is possible to more easily remove burrs with abrasive grains.

  The burr removal method of one embodiment may further include a step of rectifying the airflow. In the step of rectifying, the mode in which the abrasive grains contact or collide with a plurality of objects to be processed may be controlled by rectifying the airflow. By rectifying the air flow, the behavior of abrasive grains with respect to the article to be processed can be controlled, and the form of deburring can be changed. Thereby, the behavior of the abrasive grains can be changed according to the strength and form of the article to be processed, the ease of removing burrs, and the like.

  In the method for removing burrs according to one embodiment, in the step of stirring a plurality of articles to be processed, the processing container is inclined at a predetermined angle (30 to 70 ° in one embodiment), and the processing container is rotated ( In one embodiment, a plurality of articles to be processed may be agitated by causing the rotational speed of the processing vessel to be 5 to 50% of the critical rotational speed. In this case, a centrifugal force due to the rotation of the processing container and a gravitational force along the processing board are added to the product to be processed. By controlling the inclination angle and the number of rotations of the processing container, these forces can be used to bring a plurality of articles to be processed into a fluid state and can be well stirred.

  In another aspect of the present invention, a deburring device for removing burrs from a workpiece is provided. The deburring device includes a processing container for setting a plurality of objects to be processed, an agitation mechanism for agitating the plurality of objects to be processed set in the processing container, and a plurality of objects to be agitated by the agitation mechanism. An abrasive grain supply mechanism that feeds abrasive grains toward the processed product, and a suction mechanism that generates an air flow in a direction from the abrasive grain supply mechanism toward the processing container by a suction force. The suction mechanism accelerates the abrasive grains introduced toward the plurality of objects to be processed by the abrasive grain supply mechanism to a predetermined speed by the air flow, and causes the accelerated abrasive grains to contact or collide with the plurality of objects to be processed. As a result, burrs of a plurality of products to be processed are removed.

  According to the deburring device according to another aspect, the abrasive grains thrown toward the object to be processed are accelerated to a predetermined speed by the air flow generated by the operation of the suction mechanism. Due to this acceleration, the abrasive grains that have reached the workpiece have kinetic energy suitable for removing burrs. For this reason, it is possible to remove burrs from the object to be processed without excessively cutting the object to be processed when the abrasive grains collide or come into contact with the object to be processed. At this time, since a plurality of products to be processed set in the processing container are agitated, burrs can be uniformly removed from all the products to be processed.

  According to various aspects and embodiments of the present invention, it is possible to obtain an article to be processed from which burrs are well removed.

It is a schematic diagram for demonstrating the deburring apparatus used by embodiment of this invention. It is a schematic diagram for demonstrating the removal mechanism of the burr | flash in embodiment of this invention. It is a flowchart which shows the removal process of the burr | flash in embodiment of this invention.

  An example of the deburring apparatus and deburring method of the present invention will be described with reference to the drawings. In the following description, as a workpiece (processed product), a raw material powder formed and hardened, that is, a molded body in a state before firing into a sintered body was used. In the following description, the vertical and horizontal directions refer to the directions in the drawings unless otherwise specified. In addition, this invention is not restricted to the structure of this embodiment, It can change suitably 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 sorting mechanism 50.

  The processing container 10 is a member for accommodating the workpiece W. The workpiece W is an article to be processed and is, for example, a molded body that constitutes 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 raw material powder or by calcining after molding the raw material powder. The workpiece W may be a ceramic or magnetic material formed by a compacting 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 includes a processing board 11. The processing board 11 has the 1st surface 11a (mounting surface) which is a surface in which the workpiece | work W is mounted, and the 2nd surface 11b which is a surface on the opposite side to the 1st surface 11a. The processing board 11 has air permeability and can pass abrasive grains, but has a plurality of openings that can stay on the first surface 11a side without passing the workpiece W. Specifically, the machining board 11 is provided with a plurality of through holes that penetrate the machining board 11 in a direction from the first surface 11a to the second surface 11b. Each of the plurality of through holes has a size through which the abrasive grains G can pass and the workpiece W cannot pass. The processing board 11 may be, for example, a board configured in a net shape, a punching metal, or a board provided with a plurality of slits. Moreover, the shape of the processing board 11 is not specifically limited.

  The processing container 10 of the present embodiment includes a disk-shaped processing board 11 configured in a net shape and a frame body 12 fixed to an outer edge portion of the processing board 11. The frame body 12 surrounds the periphery of the processing board 11 at least on the first surface 11 a of the processing board 11. That is, the processing container 10 of the present embodiment has a cylindrical shape in which the upper side (first surface 11a side) of the processing board 11 is opened.

  The stirring mechanism 20 is connected to the processing container 10 and stirs the plurality of workpieces W accommodated (set) in the processing container 10 so as to be in a fluid state. As long as the workpiece W can be stirred, the configuration of the stirring mechanism 20 is not particularly limited. For example, the stirring mechanism 20 may be configured to rotate the processing container 10 or may be configured to vibrate the processing container 10. Other known configurations may be used as the stirring mechanism 20. In the present embodiment, the stirring mechanism 20 rotates the processing container 10 about the plane center of the processing board 11 as an axis. Specifically, the stirring mechanism 20 includes a holding member 21 and a rotation mechanism 22. The holding member 21 rotatably holds the processing container 10 in a state where the processing container 10 is inclined at a predetermined inclination angle α.

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

  The abrasive grain supply mechanism 30 is a mechanism for throwing the abrasive grains G toward the workpiece W. The abrasive grain supply mechanism 30 includes a storage tank 31 and a carry-out unit 32. The storage tank 31 is a tank for storing the abrasive grains G. The carry-out unit 32 is provided with a discharge port 32a. The carry-out part 32 is arranged so that the discharge port 32 a is located above the first surface 11 a of the processing board 11. The carry-out unit 32 may be configured to discharge the abrasive grains G in the storage tank 31 (hopper) from the discharge port 32a in a fixed amount. The carry-out unit 32 includes, for example, a transport screw and a trough that encloses the transport screw, and may be configured to advance the abrasive grains G in the storage tank 31 toward the discharge port 32a provided in the trough. . Further, the carry-out unit 32 may include a disk-shaped bottom plate and a scraper (not shown) that rotates horizontally around the center of the bottom plate. In this case, the carry-out part 32 deposits a predetermined amount of abrasive grains G on the bottom plate by the angle of repose by arranging the bottom surface of the storage tank 31 slightly apart from the bottom plate, and this is discharged by the scraper with the discharge port 32a. It may be configured to be scraped toward. Other known configurations may be used as the carry-out unit 32. In the present embodiment, the carry-out unit 32 has the former configuration.

  The suction mechanism 40 has a function of accelerating and sucking the abrasive grains G. The suction mechanism 40 includes a hose 43 and a dust collector 42. One end surface of the hose 43 (suction portion 41 in the present embodiment) is provided below the second surface 11b of the processing board 11 and is separated from the second surface 11b. The dust collector 42 is connected to the hose 43.

  The sorting mechanism 50 is a mechanism that sorts reusable abrasive grains from dust. The sorting 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 having one end surface forming the suction part 41 is connected to the sorting mechanism 50, and the sorting mechanism 50 is connected to the dust collector 42 by the second hose 43b. As will be described later, the sorting mechanism 50 separates the dust into reusable abrasive grains and other fine particles (abrasive grains with cracks or chips and workpiece cutting powder generated by removing burrs). Mechanism. The sorting mechanism 50 may be configured to perform classification using a specific gravity difference of dust and an air flow. As the sorting mechanism 50, for example, a cyclone separator, a centrifugal classifier, or other known configurations may be used. In the present embodiment, a cyclone separator is used as the sorting mechanism 50, and the bottom of the cyclone separator is connected to the storage tank 31.

  Next, a method for removing burrs will be described with reference to FIGS.

(S01: Preparation process)
A deburring device 01 and a plurality of workpieces W are prepared. In advance, the abrasive grains G are charged into the storage tank 31 shown in FIG. The material of the abrasive grain G used in the present embodiment can be appropriately selected according to the material and shape of the workpiece W and the processing purpose. For example, the abrasive grains G may be metal or non-metallic particles (shots, grids, and cut wires), ceramic-based particles (such as Al ₂ O ₃ , SiC, and ZrO ₂ ), natural stone particles (emery, silica, and diamond). Etc.), plant-based particles (such as walnut shells, peach seeds, and apricot seeds), and resin-based particles (such as nylon, melamine, and urea).

  Further, the particle diameter of the abrasive grains G can be appropriately selected according to the material and shape of the workpiece W and the processing purpose. However, the particle diameter of the abrasive grains G must be selected so that it can pass through the opening (through hole) of the processing container 10. For example, when the ceramic particles are abrasive grains G, the grain diameter of the abrasive grains G is F220 or # 240 or more and # 1000 or less as defined in JIS (Japan Industrial Standards) R6001; The diameter is selected so that it can pass through 10 openings (through holes).

(S02: Step of storing workpiece in processing container)
By placing the plurality of workpieces W on the first surface 11 a of the processing board 11, the plurality of workpieces W are accommodated (set) in the processing container 10. The capacity of the workpiece W is appropriately selected according to the properties of the workpiece W and the size of the processing container 10 so that the workpiece W can be held in the processing container 10 and can be stirred in a fluid state. In FIG. 2, one work W is shown for convenience.

(S03: Step of stirring the workpiece)
The motor 22a is operated to rotate the processing container 10. The workpiece W accommodated in the processing container 10 follows the rotation of the processing container 10 and moves along the frame body 12. Since the processing container 10 is held at an inclination, a centrifugal force in a direction toward the frame body 12 and a component of gravity along the processing board 11 are added to the work W. When the workpiece W moves (rises) to a predetermined position, the gravitational force becomes larger than the centrifugal force, so that the workpiece W moves away from the frame 12 and falls downward along the processing board 11. Thus, the movement and dropping of the workpieces W are continuously performed, so that the plurality of workpieces W are in a fluid state and are agitated. In order to realize this flow state, the inclination angle α of the processing container 10 may be 30 to 70 ° or 40 to 60 ° with respect to the horizontal plane. When the inclination angle α of the processing container 10 is too small, the effect of promoting fluidization by gravity is small. If the inclination angle α of the processing container 10 is too large, the component force of gravity becomes too large with respect to the centrifugal force, so that it is difficult to move the workpiece W following the rotation of the processing container 10.

  Moreover, since the centrifugal force becomes too strong when the rotational speed of the processing container 10 is too large, it is difficult to drop the workpiece W by the force of gravity. Conversely, if the rotational speed of the processing container 10 is too small, the centrifugal force becomes too weak, and it becomes difficult to move the workpiece W by the rotation of the processing container 10. In either case, the workpiece W cannot be made into a fluid state. In order to bring the plurality of workpieces W into a fluidized state and stir well, the rotational speed of the processing vessel 10 may be 5 to 50% of the critical rotational speed, or may be 10 to 30%. Here, the critical rotational speed means that the centrifugal force applied to the workpiece W becomes larger than the gravity force when the rotational speed of the processing container 10 is increased, and the workpiece W does not fall. 12 indicates the rotation speed at the time when the rotation starts. When the rotational speed of the processing container 10 is too slow, the influence of gravity is too great on the centrifugal force, so that the work W is not sufficiently moved along the frame 12 of the processing container 10, and as a result, the work W The flow due to the fall of is not enough. When the rotational speed of the processing container 10 is too high, the gravity is too small with respect to the centrifugal force, so that there is a work W that does not fall while being pressed against the frame 12 of the processing container 10, and the flow is sufficiently performed. I will not.

  Further, when the workpiece W is in a fluidized state and stirred, the workpieces W collide with each other, and the fixing force of the burrs formed on the workpiece W is weakened, so that the burrs are easily removed from the workpiece W.

(S04: Step of generating airflow)
When the dust collector 42 is operated, an air flow from the first surface 11a to the second surface 11b is generated in the vicinity of the processing board 11.

(S05: Step of rectifying)
By rectifying the flow of the airflow, the manner in which the abrasive grains G collide with or come into contact with the workpiece W can be intentionally changed (controlled). 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 will be described later, since the speed of the abrasive grains G when the abrasive grains G collide with or come into contact with the workpiece W is very low, a mode in which the abrasive grains G collide with or come into contact with the workpiece W by the rectifying step (S05). It can be easily changed. Note that the rectification step S05 may be omitted.

(S06: Step of putting abrasive grains)
When the abrasive grain supply mechanism 30 is operated, the abrasive grains G charged in the storage tank 31 are discharged in a fixed amount from the discharge port 32a and are thrown toward the workpiece W (dropped in this embodiment). The speed of the abrasive grain G in the direction toward the workpiece W when the abrasive grain G is discharged from the discharge port 32a is 0 m / sec or a very small speed, and an external force such as a suction force while the abrasive grain G is free-falling. Even if the workpiece W collides with or comes into contact with the workpiece W, the burrs on the workpiece W are not removed.

(S07: Step of accelerating abrasive grains)
As shown in FIG. 2, the abrasive grains G discharged from the discharge port 32a are generated in the acceleration region A (first surface 11a side) by the air flow generated in the step (S04) of generating the air flow. Area) by free fall. The abrasive grain G that has reached the acceleration region A is accelerated toward the suction part 41 so that the speed when the abrasive grain G collides with or comes into contact with the workpiece W becomes a predetermined speed. The predetermined speed may be a speed at which the burrs of the workpiece W can be satisfactorily removed and the workpiece W is not damaged and pierced with the abrasive grains G. For example, when the workpiece V has a Vickers hardness (specified in JIS Z2244; 2009) of 3 to 200 Hv (test force is 0.2 N), the predetermined speed may be 5 to 30 m / sec. It may be 20 m / sec. This predetermined speed is a very low speed for removing burrs by contact or collision of abrasive grains, and cannot be realized by the conventional burrs removing method. For example, in grinding by a blast processing apparatus, since the injection pressure is high (for example, 0.2 MPa or more), a very slow speed such as the above-described predetermined speed cannot be realized. If the injection pressure is very low in order to set the abrasive speed to this predetermined speed, the injection amount of the injection material from the nozzle is not stable, and unevenness occurs in the finish of the workpiece. 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 come into contact with the workpiece W can be set to a very low speed. W burrs can be removed. This speed adjustment can be performed by adjusting the suction flow rate by the dust collector 42, changing the size and shape of the suction portion 41, and the like. The adjustment of the suction flow rate by the dust collector 42 is performed, for example, by changing the rotational speed of a motor built in the dust collector 42 or by providing a damper for sucking outside air in the hose 43 and adjusting the opening of the damper. obtain.

(S08: Step of removing burrs on workpiece)
The abrasive grain G that has reached the acceleration region A proceeds toward the suction portion 41 while being accelerated, and reaches the workpiece surface of the workpiece W. Thereafter, the abrasive grain G further collides with or comes into contact with the workpiece W, and further advances toward the suction part 41. The behavior F shown in FIG. 2 shows the behavior of the abrasive grains G. An example of an aspect in which the abrasive grain G collides with or comes into contact with the workpiece W will be described as behaviors F1, F2, and F3.
Behavior F1: The abrasive grain G rebounds after colliding linearly with the burr | flash of the workpiece | work W. The burrs are removed by the impact force when the abrasive grains G collide with the burrs.
Behavior F2: The abrasive grain G travels along the upper surface after colliding with the upper surface of the workpiece W. The burrs are removed by the impact force when the abrasive grains G collide with the workpiece W and the frictional force when the abrasive grains G travel along the upper surface.
Behavior F3: The abrasive grain G advances along the ridge corner of the workpiece W. The burrs are removed by at least one of the impact force when the abrasive grain G collides with the ridge corner of the workpiece W or the friction force when passing through the ridge corner.

(S09: Step of collecting abrasive grains)
The abrasive grains G that have collided or contacted the workpiece W pass through the processing board 11 and move to the second surface 11b side. The abrasive grains G that have moved to the second surface 11 b side are sucked by the dust collector 42 from the suction portion 41. At that time, the aforementioned fine particles also pass through the processing board 11 and are sucked from the suction portion 41. Dust such as abrasive grains G and fine particles is transferred to the sorting mechanism 50 through the first hose 43a. When the sorting mechanism 50 is a cyclone separator, the dust introduced along the wall surface from the upper part of the cyclone separator falls in a spiral shape. In the process, the fine particles, which are light in weight, float upward and are collected by the dust collector 42 through the second hose 43b connected to the ceiling of the cyclone separator. On the other hand, the reusable abrasive grain G, which is a heavy particle, moves toward the bottom of the sorting mechanism 50 and is stored in a storage tank 31 connected to the bottom of the sorting mechanism 50. The abrasive grains G are again fed from the discharge port 32a toward the workpiece W.

  As described above, the abrasive grains G that are introduced from the discharge port 32a in the abrasive grain supply mechanism 30 disposed on the first surface 11a side and accelerated to a predetermined speed by the airflow generated by the dust collector 42 collide with the workpiece W. Or the burr | flash of the workpiece | work W is removed by contacting. The abrasive grains G after colliding with or coming into contact with the workpiece W are sucked by the suction portion 41 disposed on the second surface 11b side. Thereby, the abrasive grain G does not scatter around like the blasting method which is the conventional burr removal method. In addition, since the speed of the abrasive grains G when the abrasive grains G collide with or contact the workpiece W can be very slow, damage to the workpiece W may occur even when the burrs of the workpiece W having a relatively low hardness are removed. The burrs of the workpiece W can be removed well. For example, when the molded body constituting the electronic component is a workpiece W, a highly reliable electronic component can be manufactured.

  Here, the thickness of the processing board 11 may be 30 to 100 μm. If the thickness of the processing board 11 is too thin, the processing board 11 may be broken while removing burrs. If the thickness of the work board 11 is too thick, the distance that the abrasive grains G pass through the work board 11 is too long, so that the possibility of clogging increases, or the abrasive grains G are sufficiently in the acceleration region A due to pressure loss. It may not be accelerated. The radius of the ridge angle (ridge angle radius) formed by the first surface 11a of the processing board 11 and the frame body 12 may be 0.5 to 5.0 mm. That is, the ridge corner formed by the first surface 11a of the processing board 11 and the frame body 12 may be processed into an R surface having a radius of 0.5 to 5.0 mm. If the ridge angle radius is too small, there is a high possibility that the workpiece W will be caught in the ridge angle portion. If the ridge angle radius is too large, it will be difficult to keep the workpiece W in the processing container 10.

  In the present embodiment, two values, “suction rate” and “passing rate”, are defined. Here, the “suction rate” is the volume (volume / second) of abrasive grains supplied from the abrasive grain supply mechanism 30 per unit time with respect to the suction flow rate (volume / second) sucked by the suction mechanism 40 per unit time. ). The “passing rate” is the second per unit time with respect to the amount (gram / second) of the abrasive grains G introduced from the first surface 11a side toward the plurality of workpieces W in a fluid state per unit time. The ratio of the amount (gram / second) of the abrasive grains G reaching the surface 11b side is indicated. Here, the amount (gram) of the abrasive grains G introduced from the first surface 11a side toward the plurality of fluidized workpieces W refers to the weight of the abrasive grains G discharged from the discharge port 32a. In addition, the amount (gram) of the abrasive grain G that has reached the second surface 11 b side refers to the weight of the abrasive grain G that passes through the processing board 11 and is sucked by the suction mechanism 40.

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

  The longer the distance that passes between the plurality of workpieces W in the processing container 10, the longer the time during which the abrasive grains G stay between the plurality of workpieces W, and the lower the passing rate. The passing rate may be in the range of 80 to 95% by weight. If the passing rate is too high, the distance through which the abrasive grains G pass between the plurality of workpieces W is too short, so the frequency with which the abrasive grains G abut on the workpiece W is reduced, and the burrs of the workpiece W are removed well. I can't. If the passing rate is too low, the distance through which the abrasive grains G pass between the plurality of workpieces W is too long, so that the time during which the abrasive grains G stay without being accelerated by the airflow between the plurality of workpieces W becomes long. Removal of burrs from the workpiece W is hindered.

Next, the result of removing the burrs from the workpiece W by the above deburring device will be described. Here, the following two types of workpieces W were selected, and the purpose of processing was to remove burrs at the ridge corners.
Work A: Work A is a molded product before firing of a ceramic formed by compression molding of a composite material (SiC / Al ₂ O ₃ ). 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 Hv100.
Work B: Work B is a molded product before firing of a ceramic in which ferrite powder having a spinel crystal structure is formed 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 Hv20.

  As the apparatus, the deburring apparatus of the above embodiment was used. In addition, as a comparative example, a conventional blasting apparatus (modified from a MY-30C type drum blasting apparatus manufactured by Shinto Kogyo Co., Ltd.) was used.

In this example, the burrs of the workpiece W were removed with the abrasive grains A and the abrasive grains B, respectively. The abrasive grains A are alumina particles (WA # 800 manufactured by Shinto Kogyo Co., Ltd.) having an average particle diameter of 18 μm, and the apparent density of the abrasive grains A is 4.0 g / cm ³ . The abrasive grain B is a ferrite particle having an average particle diameter of 14 μm, and the apparent density of the abrasive grain B is 2.5 g / cm ³ .

The deburring device or blasting device was operated for 30 minutes to remove burrs from the workpiece W, and then the machining state of the workpiece W was evaluated. Evaluation of a processing state was performed by observing each workpiece | work used as observation object with a microscope (VHX-2000 by Keyence Corporation). The workpiece to be observed was sampled from the entire amount of workpiece after the workpiece of 1/5 of the volume of the processing vessel was accommodated in the processing vessel and the burr of the workpiece was removed (after the operation of the apparatus was completed). There are 20 workpieces. The evaluation criteria for the processing state are as follows.
○: All the workpieces have burrs removed, and there is no workpiece damage (cracking and chipping, and abrasive piercing).
Δ: Some workpieces still have burrs, but there is no damage in all workpieces.
X: Many burrs are not removed. Or there is a work that is damaged.

  In addition, the periphery of the processing container 10 was observed after the deburring of the workpiece W was performed by the deburring apparatus of the above embodiment. The periphery of the drum was observed after removing the burrs of the workpiece W by the blast processing apparatus. Then, when the adhesion of abrasive grains is not confirmed around the processing container 10 or around the drum, the evaluation of the scattering of the abrasive grains is set to “◯”, and the adhesion of abrasive grains is confirmed around the processing container 10 or around the drum. In this case, the evaluation of the scattering of the abrasive grains was “x”. Similarly, when the workpiece is not confirmed around the processing container 10 or around the drum, the evaluation of the scattering of the workpiece is “◯”, and when the workpiece is confirmed around the processing container 10 or around the drum, the workpiece is scattered. Was evaluated as “×”.

  The results of the above evaluation under each condition are shown in Table 1. Regarding the items of the apparatus in Table 1, as shown in FIG. 1, “inclination angle” indicates the inclination angle α (°) of the processing container 10 with respect to the horizontal plane in the deburring apparatus of the above embodiment, and in the horizontal plane in the blast processing apparatus. Shows the tilt angle of the drum with respect to. “Rotational speed” indicates the ratio (%) of the rotational speed to the critical rotational speed. In addition, the “velocity” of the abrasive is a result of previously measuring the particle velocity of the abrasive immediately before contacting the workpiece W under each condition with a flow velocity measurement system (PIV system manufactured by Flowtech Research Co., Ltd.). Was described. Further, “thickness” indicates the thickness (μm) of the processing board 11, and “ridge angle radius” indicates the size (mm) of the ridge angle formed by the first surface 11 a of the processing board 11 and the frame body 12. ).

  The suction rate is changed by changing the amount (grams / second) of abrasive grains thrown from the first surface 11a side toward the plurality of workpieces W in a fluid state.

The amount of abrasive grains thrown from the first surface 11a side toward the plurality of workpieces W in a fluid state per unit time and the amount of abrasive grains that reached the second surface 11b side per unit time are preliminarily determined. The passage ratio was calculated by measuring. Specifically, the passage ratio was calculated by measuring the following (1) and (2) when the deburring apparatus was operated for 1 minute using a fired product of the workpiece A having no burrs.
(1) Amount of abrasive grains discharged from the discharge port 32a of the abrasive grain supply mechanism 30 (amount of abrasive grains introduced from the first surface 11a side toward a plurality of workpieces W in a fluid state per unit time)
(2) Amount of abrasive grains passing through the plurality of workpieces W and the processing board 11 and sucked by the suction mechanism 40 (amount of abrasive grains reaching the second surface 11b per unit time)
Here, the reason why the fired product of the workpiece A having no burrs is the workpiece W is that it is difficult to generate cutting powder such as burrs of the workpiece W.

  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 board 11 is 40 μm, and the ridge angle radius of the processing board 11 is 1.0 mm. The conditions under which the abrasive speed was 15 m / sec and the suction rate was 30% were used as reference conditions. In the deburring apparatus of the above embodiment, the suction rate was changed between 5 to 60% by volume among the reference conditions, and the deburring of the workpiece A was performed using the abrasive grains A (Examples 1 to 5). Moreover, in the deburring apparatus of the said embodiment, the suction | attraction rate was changed between 5-60 volume% among reference | standard conditions, and the burr | flash of the workpiece | work B was removed using the abrasive grain B (Examples 17-21). ). When the suction ratio was 10 to 50% by volume, the evaluation of the machining state was all “◯” or “Δ” regardless of the type of workpiece (Examples 1 to 3 and Examples 17 to 19). On the other hand, when the suction ratio was out of the range of 10 to 50% by volume, the evaluation of the processing state was “x” (Examples 4 and 5 and Examples 20 and 21).

  Next, from the above-mentioned reference conditions, any one of “inclination speed”, “rotational speed”, “speed”, “thickness”, and “ridge angle radius” is changed in order to remove burrs on the workpiece A and the workpiece B. (Examples 6 to 15 and Examples 22 to 31). The abrasive grains A were used for removing burrs on the workpiece A, and the abrasive grains B were used for removing burrs on the workpiece B. As a result, all the evaluations of the processing state were “◯” or “Δ”. In the example in which the evaluation of the machining state is “△”, the burr remains slightly on the workpiece, and the workpiece is not damaged. Therefore, by further increasing the processing time, the machining state can be evaluated. It shows that it can be “◯”.

  Among Examples 1 to 15 and Examples 17 to 31 described above, Examples in which the evaluation of the processing state was “◯” or “Δ” (Examples 1 to 3, Examples 6 to 19, Examples 22 to With regard to 31), the passing rate was 80 to 95% by weight. Therefore, burrs can be removed satisfactorily at a passage ratio in this range.

  In the deburring apparatus of the above embodiment, when the burr of the workpiece A was removed under the above-mentioned standard conditions using the ferrite abrasive grains B that are a different material from the alumina material that is the material of the workpiece A, the ferrite was removed. Since alumina was harder than that, burrs could be removed satisfactorily without abrasive grains sticking to the workpiece (Example 16). On the other hand, when the burr of the workpiece B was removed under the above-mentioned standard conditions using the alumina abrasive grain A which is a different material from the ferrite material which is the material of the work B, the piercing of the abrasive grain was confirmed. (Example 32). This is thought to be because ferrite is softer than alumina. Therefore, when removing burrs from ferritic workpieces, it is better to remove burrs using ferritic abrasive grains, which are homogeneous materials, or abrasive grains made of a softer material than ferrite. It turns out that you can.

  In Examples 1 to 32, as a result of observing the periphery of the processing container 10 after the burr removal process, adhesion of abrasive grains and dropping of the workpiece W were not confirmed around the processing container 10. Thereby, it turned out that the deburring apparatus of the said embodiment can remove a burr | flash from the workpiece | work W, without disperse | distributing an abrasive grain to the circumference | surroundings and without a workpiece | work being blown away.

  On the other hand, when the burrs were removed from the workpiece W using the blast processing apparatus, the burrs on the workpiece W were removed, but the workpiece W was damaged, and the evaluation of the machining state was “x”. (Comparative Example 1 and Comparative Example 2). Further, when the periphery of the drum, that is, the machining chamber was observed after the burr removal process, adhesion of abrasive grains was confirmed on the wall surface of the blast machining chamber, and the evaluation of the scattering of the abrasive grains was “x”. Furthermore, when the classification mechanism connected to the blasting machine was confirmed, the mixing of the workpieces W was confirmed. This indicates that depending on the properties of the workpiece W, the workpiece was blown off from the drum during the burr removal process.

According to the above embodiment, a new method for removing burrs can be provided. In this method of removing burrs, the abrasive grains are accelerated to a predetermined speed by an air flow to impart kinetic energy suitable for removing burrs to the abrasive grains, and the abrasive grains having this kinetic energy collide with or come into contact with the workpiece. Burrs are removed from the workpiece. And the whole quantity of this abrasive grain and microparticles | fine-particles is collect | recovered from a suction member. Thereby, the following effects are obtained.
(1) Abrasive grains do not scatter around.
(2) The workpiece does not jump 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 burr removal process of the workpiece can be performed with very low speed abrasive grains. Deburring of the workpiece can be performed particularly well.

  In addition, the burr removal method of one embodiment can be applied well to a workpiece having a relatively low hardness (for example, copper or aluminum).

  DESCRIPTION OF SYMBOLS 01 ... Deburring apparatus, 10 ... Processing container, 11 ... Processing board, 11a ... First surface, 11b ... Second surface, 12 ... Frame body, 20 ... Agitation mechanism, 21 ... Holding member, 22 ... Rotation mechanism, 22a ... motor, 22b ... rotational force transmission member, 30 ... abrasive supply mechanism, 31 ... storage tank, 32 ... unloading part, 32a ... discharge port, 40 ... suction mechanism, 41 ... suction part, 42 ... dust collector, 43 ... hose , 43a ... first hose, 43b ... second hose, 50 ... sorting mechanism, A ... acceleration region, F (F1, F2, F3) ... behavior of abrasive grains, G ... abrasive grains, W ... workpiece.

Claims (18)

A method of removing burrs for removing burrs from a workpiece,
A deburring device including a processing container and a suction mechanism that generates a suction force, and a step of preparing a plurality of articles to be processed;
Setting the plurality of articles to be processed in the processing container;
Stirring the plurality of articles to be processed set in the processing container;
The abrasive grains thrown toward the plurality of articles being stirred are accelerated to a predetermined speed by the air flow generated by the operation of the suction mechanism, and the abrasive grains are accelerated to the plurality of articles to be treated. Removing the burrs of the plurality of products to be processed by contacting or colliding
A method for removing burrs including   2. The method for removing burrs according to claim 1, wherein each of the plurality of products to be processed is obtained by molding raw material powder or by calcining after forming raw material powder.   The method for removing burrs according to claim 2, wherein each of the plurality of articles to be processed is a ceramic or a magnetic material formed by a compacting method.   4. The step of stirring the plurality of articles to be processed includes stirring the plurality of articles to be processed by bringing the plurality of articles to be processed set in the processing container into a fluid state. The method for removing burr according to any one of the above items. The processing container is
A working machine having a first surface and a second surface that is opposite to the first surface;
In the first surface of the processing board, a frame surrounding the periphery of the processing board;
With
The processing board is provided with a plurality of through holes penetrating the processing board in a direction from the first surface toward the second surface,
Each of the plurality of through holes has a size through which the abrasive grains can pass and each of the plurality of articles to be processed cannot pass,
5. The burr according to claim 1, wherein in the step of setting the plurality of articles to be processed in the processing container, the plurality of articles to be processed are placed on the first surface. Removal method. The thickness of the processing board is 30-100 μm,
6. The burr removing method according to claim 5, wherein a ridge angle portion formed by the first surface of the processing board and the frame is processed into an R surface having a radius of 0.5 to 5.0 mm. The suction mechanism is disposed on the second surface side;
The burr removal method according to claim 5 or 6, wherein the air flow is an air flow directed from the first surface toward the second surface. Further comprising the step of collecting the abrasive grains,
In the step of removing burrs from the plurality of products to be processed, the abrasive grains are charged from the first surface side toward the plurality of products to be processed.
The burr removal method according to any one of claims 5 to 7, wherein, in the step of collecting the abrasive grains, the abrasive grains that have reached the second surface are sucked and collected by the suction mechanism. .   The abrasive grains that have reached the second surface per unit time with respect to the amount of the abrasive grains that are charged toward the plurality of workpieces being stirred from the first surface side per unit time The method for removing burrs according to any one of claims 5 to 8, wherein the proportion of the amount of is from 80 to 95% by weight.   The ratio of the volume of the abrasive grains introduced from the first surface side to the plurality of workpieces per unit time with respect to the suction flow rate sucked by the suction mechanism per unit time is 10-50. The method for removing burrs according to any one of claims 5 to 9, wherein the content is vol%.   11. The burr fixing device according to claim 1, wherein in the step of stirring the plurality of articles to be processed, the fixing force of the burr is weakened by stirring the plurality of articles to be processed. Removal method.   The burr removal method according to any one of claims 1 to 11, wherein a speed of the abrasive grains when the abrasive grains contact or collide with the plurality of workpieces is 5 to 30 m / sec. . Further comprising the step of rectifying the air flow,
The burr according to any one of claims 1 to 12, wherein, in the step of rectifying, the mode in which the abrasive grains contact or collide with the plurality of workpieces is controlled by rectifying the air flow. Removal method.   The step of stirring the plurality of articles to be processed is configured such that the plurality of articles to be processed are stirred by disposing the processing container at a predetermined angle and rotating the processing container. 14. The method for removing burrs according to any one of items 13.   The burr removing method according to claim 14, wherein the predetermined angle is 30 to 70 °.   The burr removal method according to claim 14 or 15, wherein a rotation speed of the processing container is 5 to 50% of a critical rotation speed.   The method for removing burrs according to claim 1, wherein each side of the plurality of products to be processed is 100 to 1600 μm. A deburring device for removing burrs from a workpiece,
A processing container for setting a plurality of articles to be processed;
An agitation mechanism for agitating the plurality of articles to be processed set in the processing container;
An abrasive grain supply mechanism for introducing abrasive grains toward the plurality of articles to be processed in a state of being stirred by the stirring mechanism;
A suction mechanism for generating an airflow in a direction from the abrasive grain supply mechanism toward the processing container by a suction force;
With
The suction mechanism accelerates the abrasive grains introduced toward the plurality of objects to be processed by the abrasive grain supply mechanism to a predetermined speed by the air flow, and the accelerated abrasive grains are accelerated to the plurality of objects to be processed. A deburring device that removes burrs from the plurality of products to be processed by contacting or colliding with the products to be processed.

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