KR102432764B1 - Burr removal device and burr removal method - Google Patents

Abstract

A deburring method includes: a processing container; a deburring device including a suction mechanism for generating a suction force; and a step of preparing a plurality of workpieces; a step of setting the plurality of workpieces in the processing container; A step of agitating a plurality of to-be-processed objects set in a container, and accelerating the abrasive particles injected toward the plurality of to-be-processed objects in a stirred state to a predetermined speed by the airflow generated by the operation of the suction mechanism, and making the abrasive particles contact or collide with the plurality of to-be-processed objects to remove the burrs of the plurality of to-be-processed objects.

Description

DEVICE AND BURR REMOVAL METHOD

The present disclosure relates to a deburring apparatus for removing a burr from a workpiece and a burr removal method.

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

As these electronic components, a raw material powder of a hard and brittle material such as ceramics or magnetic material is molded by a pressure molding method, a doctor blade method, an injection molding method, or the like, and then plasticized. ) is used. If there is a burr in the molded object constituting this electronic part, for example, it causes deterioration of the performance of the electronic device due to the burr missing in the mounting process by an automatic mounting machine, and a mounting defect due to the burr. , burrs are removed before mounting.

Patent Document 1 discloses a method for removing burrs by a wet barrel polishing method as a method for removing burrs from a molded article constituting an electronic component. Patent Document 1 discloses a method of forming a green sheet by molding a paste containing a raw material into a sheet shape, and removing the burrs of green chips obtained by cutting the green sheet by polishing by wet barrel polishing. have. Since the wet barrel polishing method is a polishing method with a relatively high polishing ability, it is excessively polished depending on the strength of the molded body, which affects the dimensional accuracy of electronic components. Moreover, since treatment of the wastewater generated by grinding|polishing, drying of the molded object after grinding|polishing, etc. are required, manufacturing cost increases.

As another method of removing the burrs of the molded article constituting the electronic component, a method using an air blasting device can be considered (eg, described in paragraph 0002 of Patent Document 2). In general, an air blasting device sprays abrasive particles onto a work piece together with compressed air at a very high pressure of 0.2 MPa or more as a two-phase flow of meat. For this reason, when the burr of a small workpiece|work, such as an electronic component, is removed by grinding|polishing, the workpiece itself scatters to the surroundings by this abnormal flow of meat. Moreover, in the method using the air blasting apparatus, since the grinding|polishing force is stronger than the above-mentioned barrel grinding|polishing method, there exists a possibility that defects, such as a crack and a crack, may arise depending on the intensity|strength of a workpiece|work.

Patent Document 1: Japanese Patent Laid-Open No. 2008-227314 Patent Document 2: Japanese Patent Laid-Open No. 2010-188470

In this technical field, a new deburring apparatus and a deburring method for removing the burr of a workpiece are desired.

In one aspect of the present invention, there is provided a burr removal method for removing the burr of an object to be treated. This burr removal method includes the following steps (1) to (4).

(1) A process of preparing a processing container, a deburring device including a suction mechanism for generating a suction force, and a plurality of to-be-processed products.

(2) A step of setting a plurality of to-be-processed products in a processing container.

(3) A step of stirring a plurality of to-be-processed products set in a processing container.

(4) The abrasive grains injected toward the plurality of to-be-processed objects in a stirred state are accelerated to a predetermined speed by the airflow generated by the operation|movement of a suction mechanism, and while the abrasive grain is accelerated|stimulated to a plurality of to-be-processed objects A process of removing burrs from a plurality of workpieces by contacting or colliding with them.

According to the burr removal method according to one aspect, the abrasive particles injected toward the to-be-processed object are discharged at a predetermined speed (in one embodiment, the abrasive particles are separated from the plurality of objects and The speed of the abrasive particles when they contact or collide is accelerated to 5-30 m/sec). Due to this acceleration, the abrasive grains have kinetic energy suitable for removing the burrs, so that when the abrasive grains contact or collide with the object, the object is removed from the object without excessive cutting. can be removed. At this time, since the plurality of to-be-processed objects set in the processing container are agitated, burrs can be equally removed from all the to-be-processed objects. In addition, "injection of abrasive grains" as used herein means simply supplying abrasive grains toward the object without an initial velocity, or supplying abrasive grains toward the object at a very small initial velocity. , it is different from spraying or projecting abrasive particles toward the object to be processed, such as in a blast processing device. For example, the abrasive particles may be fed toward the workpiece by allowing the abrasive particles to fall freely, and the abrasive particles may be fed to the workpiece with a weak air volume that does not scatter around or affect the burr removal process. You can supply it towards.

In the burr removal method of one Embodiment, each of a plurality of to-be-processed products may be obtained by shape|molding raw material powder, or calcining after shape|molding raw material powder. For example, a compact obtained by molding raw material powder such as green chips, or a compact that is calcined after forming the raw material powder, that is, a compact in a state before being calcined to form a sintered compact, has a relatively low burr strength compared to the sintered compact. For this reason, the burr can be removed favorably by making a molded object the object of removal of a burr. Here, sintering refers to heating a molded article formed by pressing raw material particles, adhering adjacent raw material particles to each other, reducing the gap between the particles, and baking and hardening.

In the burr removal method of the embodiment, each of the plurality of to-be-processed articles may be ceramics or magnetic materials molded by the compaction method. The molding method of the object to be treated is not particularly limited, but in the object to be formed by the green compaction method, adjacent raw material particles are not adhered by heating to each other in the product-formable portion and the burr portion. Therefore, it is possible to particularly favorably remove burrs present in the to-be-processed product.

In the burr removal method of one embodiment, in the step of stirring the plurality of to-be-processed products, you may stir a some to-be-processed object by making the some to-be-processed object set in a processing vessel into a fluid state. Since the to-be-processed object is comparatively small-size (for example, 100-1600 micrometers on one side), by making a several to-be-processed object into a fluid state, it can stir and disperse|distribute evenly.

In the burr removal method of one Embodiment, a processing container may be equipped with a processing board and a frame. A processing board may be provided with a 1st surface and the 2nd surface which is a surface on the opposite side to the 1st surface. The processing plate may be provided with a plurality of through-holes penetrating the processing plate in a direction from the first surface to the second surface. Each of the plurality of through holes may have a size through which the abrasive particles can pass and through which each of the plurality of to-be-processed objects cannot pass. The frame may surround the peripheral edge of the processing panel on the first surface of the processing panel. Moreover, in the process of setting a some to-be-processed object in a processing container, you may mount a some to-be-processed object on the 1st surface. In this case, the to-be-processed object can be set in a processing container, and it can stir favorably without impairing the ability to remove a burr.

In the burr removal method of one Embodiment, 30-100 micrometers may be sufficient as the thickness of a processing board, and the ribbed part which the 1st surface of a processing board and a frame make|forms may be processed into the R surface with a radius of 0.5-5.0 mm. With this configuration, it is possible to suppress the to-be-processed product from remaining in the ribbed portion of the processing vessel, or to suppress being caught between the members forming the processing vessel.

In the burr removal method of one Embodiment, the suction mechanism may be arrange|positioned on the 2nd surface side. And the airflow toward the 2nd surface may be sufficient as an airflow. With this configuration, an airflow from the first surface side to the second surface side is generated in the vicinity of the object to be processed, that is, in the processing container, so that the burr of the object to be processed can be removed satisfactorily by this airflow.

The burr removal method of one Embodiment may further include the process of collect|recovering abrasive grains. In the process of removing the burr of a some to-be-processed object, you may inject|throw-in toward a some to-be-processed object from the 1st surface side. In the step of recovering the abrasive particles, the abrasive particles that have reached the second surface may be collected by sucking the abrasive particles with a suction mechanism. The abrasive particles and fine particles (these abrasive particles and fine particles are generally referred to as "dust" hereinafter) proceed toward the suction mechanism, so that the dust is suppressed from scattering outside the area where deburring is performed. The fine particles include abrasive particles having cracks or cracks, and chips generated by the burr removal treatment.

In the burr removal method of one embodiment, the ratio of the amount of abrasive particles reaching the second surface per unit time to the amount of abrasive grains fed toward the plurality of to-be-processed objects being stirred from the first surface side per unit time ( passing ratio) may be 80 to 95% by weight. By setting the passage ratio in this range, it is possible to suppress the frequency at which the abrasive particles contact the object to be treated from a certain level or higher without impeding the acceleration of the abrasive particles. For this reason, the abrasive grain accelerates favorably, and it becomes possible to remove the burr|burr of a to-be-processed object favorably.

In the burr removal method of one embodiment, the ratio (suction ratio) of the volume of the abrasive particles injected toward the plurality of workpieces from the first surface side per unit time to the suction flow rate sucked by the suction mechanism per unit time (suction ratio) is 10 -50 volume% may be sufficient. By setting the suction ratio within this range, the amount of the abrasive particles can be sufficient to sufficiently remove the burrs without impeding the acceleration of the abrasive particles. Moreover, by making the attraction|suction ratio into the above-mentioned range, the abrasive grain injected|thrown-in toward a some to-be-processed object can fully be attracted|sucked by a suction mechanism. For this reason, the abrasive particles are accelerated favorably, and the possibility that the abrasive particles and fine particles are scattered around can be reduced.

In the burr removal method of one Embodiment, in the process of stirring a plurality of to-be-processed products, the sticking force of a burr may become weak by stirring a some to-be-processed object. When the burr part in a to-be-processed object comes into contact with another to-be-processed object and a processing container, the crack used as the origin of fatigue fracture is induced. As a result, the removal of the burr by the abrasive grain can be performed more easily.

The burr removal method of one Embodiment may further include the process of rectifying an airflow. In the rectifying process, you may control the aspect in which abrasive grains contact or collide with a some to-be-processed object by rectifying an airflow. By rectifying the airflow, the behavior of the abrasive particles with respect to the object to be processed can be controlled, and the mode of deburring can be changed. Thereby, the behavior of the abrasive particles can be changed in accordance with the strength and shape of the object to be treated, ease of removal of burrs, and the like.

In the burr removal method of one embodiment, in the step of stirring a plurality of to-be-processed products, a processing vessel is disposed to be inclined at a predetermined angle (30 to 70° in one embodiment), and the processing vessel is rotated (one In the embodiment, the plurality of to-be-processed objects may be stirred by making the rotation speed of the processing vessel 5 to 50% of the critical rotation speed). In this case, a centrifugal force due to rotation of the processing vessel and a component of gravity along the processing plate are added to the processing target. By controlling the inclination angle and the rotation speed of the processing vessel, the plurality of to-be-processed objects can be brought into a fluid state by using these forces, and can be stirred satisfactorily.

In another aspect of the present invention, there is provided a deburring apparatus for deburring an object to be treated. This deburring device includes a processing vessel for setting a plurality of processing objects, a stirring mechanism for stirring the plurality of processing objects set in the processing vessel, and a plurality of processing objects being stirred by the stirring mechanism. An abrasive grain supply mechanism for feeding the abrasive grains toward the surface, and a suction mechanism for generating an airflow in a direction from the abrasive grain supply mechanism toward the processing vessel by means of a suction force. The suction mechanism accelerates the abrasive particles fed toward the plurality of to-be-processed objects by the abrasive grain supply mechanism to a predetermined speed by an airflow, and also causes the accelerated abrasive grains to contact or collide with the plurality of to-be-processed objects. Remove the burr from the object to be treated.

According to the deburring apparatus according to another aspect, the abrasive grains injected toward the to-be-processed object are accelerated to a predetermined speed by the airflow generated by the operation of the suction mechanism. Due to this acceleration, the abrasive grains reaching the workpiece have kinetic energy suitable for deburring. For this reason, when abrasive grains collide or come into contact with a to-be-processed object, the to-be-processed object can be removed from a to-be-processed object, without cutting it excessively. At this time, since the plurality of to-be-processed objects set in the processing container are agitated, burrs can be equally removed from all the to-be-processed objects.

According to the various aspects and each embodiment of this invention, the to-be-processed object from which the burr|burr was removed favorably can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram for demonstrating the deburring apparatus used by embodiment of this invention.
It is a schematic diagram for demonstrating the mechanism of the removal of the burr in embodiment of this invention.
It is a flowchart which shows the removal process of the burr in embodiment of this invention.

An example of the deburring apparatus and deburring method of this invention is demonstrated with reference to drawings. In the following description, as the workpiece (product to be processed), a molded product obtained by molding and hardening raw material powder, that is, a molded product in a state before being fired to obtain a sintered body was used. In the following description, the directions of up, down, left and right indicate directions in the drawings unless otherwise noted. In addition, this invention is not limited 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 particle supply mechanism 30 , and a suction mechanism 40 , , a selection mechanism 50 is provided.

The processing container 10 is a member for accommodating the work W. The work W is a to-be-processed article, for example, is a molded object which comprises an electronic component. As an electronic component, a capacitor, a resistor, an inductor, a varistor, a band pass filter, a piezoelectric element, etc. are mentioned. The workpiece W may be a molded product obtained by molding the raw material powder or calcining the raw material powder after molding. The work W may be ceramics or a magnetic material formed by the compaction method. A rectangular parallelepiped may be sufficient as the shape of the workpiece|work W, and about 100-1600 micrometers may be sufficient as one side of the workpiece|work W, for example. The processing container 10 is provided with the processing board 11 . The processing board 11 has a 1st surface 11a (mounting surface) which is a surface on 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 plate 11 is breathable and has a plurality of openings that can allow the abrasive particles to pass through, but can be made to stay on the first surface 11a side without passing the work W through. The processing board 11 is provided with the some through-hole which penetrates the processing board 11 in the direction from the 1st surface 11a to the 2nd surface 11b specifically,. Each of the plurality of through holes has a size through which the abrasive particles G can pass and the work W cannot pass through. The processing plate 11 may be, for example, a half formed in a mesh shape, a punching metal, or a half provided with a plurality of slits. In addition, the shape of the processing board 11 is not specifically limited.

The processing container 10 of this embodiment is provided with the disk-shaped processing board 11 comprised in the mesh shape, and the frame 12 fixed to the outer edge part of the processing board 11. As shown in FIG. The frame 12 surrounds the periphery of the processing board 11 at least in the 1st surface 11a of the processing board 11 . That is, the processing vessel 10 of the present embodiment has a cylindrical shape in which the upper side (the first surface 11a side) of the processing plate 11 is opened.

The stirring mechanism 20 is connected to the processing vessel 10 and agitates the plurality of workpieces W accommodated (set) in the processing vessel 10 so as to be in a fluidized state. The configuration of the stirring mechanism 20 is not particularly limited as long as the workpiece W can be stirred. For example, the stirring mechanism 20 may be configured to rotate the processing vessel 10 or may be configured to vibrate the processing vessel 10 . As the stirring mechanism 20, other well-known structures may be used. In this embodiment, the stirring mechanism 20 rotates the processing container 10 with the center of the plane of the processing board 11 being the axial center. Specifically, the stirring mechanism 20 includes a holding member 21 and a rotation mechanism 22 . The holding member 21 rotatably holds the processing vessel 10 in a state in which the processing vessel 10 is inclined at a predetermined inclination angle α.

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

The abrasive grain supply mechanism 30 is a mechanism for inject|throwing-in the abrasive grain G toward the workpiece|work W. The abrasive grain supply mechanism 30 includes a storage tank 31 and a discharging unit 32 . The storage tank 31 is a tank for storing the abrasive particles G. The carrying out part 32 is provided with the discharge port 32a. The carrying out part 32 is arrange|positioned so that the discharge port 32a may be located above the 1st surface 11a of the processing board 11. As shown in FIG. The carrying-out part 32 may be comprised so that the abrasive grain G in the storage tank 31 (hopper) can be discharged|emitted from the discharge port 32a by fixed quantity. The discharging part 32 is provided with, for example, a conveying screw and a trough containing the conveying screw, and the abrasive grain G in the storage tank 31 is discharged|emitted in the discharge port 32a provided in the trough. ) may be configured to advance toward. Moreover, the carrying out part 32 may be provided with the disk-shaped bottom plate and the scraper (not shown) which horizontally rotates about the center of the bottom plate to an axial center. In this case, the carrying out part 32 deposits a predetermined amount of abrasive particles G on the bottom by a repose angle by arranging the bottom surface of the storage tank 31 a little apart on the bottom, and this You may be comprised so that it may scrape toward the discharge port 32a with a scraper. As the carrying-out part 32, other well-known structures may be used. In this embodiment, the carrying out part 32 is provided with the former structure.

The suction mechanism 40 has both the function of accelerating the abrasive grain G, and the function of attracting|sucking. The suction mechanism 40 includes a hose 43 and a dust collector 42 . One end surface of the hose 43 (the suction part 41 in this embodiment) is provided under the 2nd surface 11b of the processing board 11, and is separated from the 2nd surface 11b. The dust collector 42 is connected to the hose 43 .

The sorting device 50 is a device for sorting reusable abrasive particles from dust. Moreover, the sorting mechanism 50 is arrange|positioned in the middle of the path|route toward the dust collector 42 from the suction part 41. As shown in FIG. That is, the first hose 43a whose one end forms 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. has been As described later, the sorting mechanism 50 separates the dust into reusable abrasive particles and other fine particles (cracked or cracked abrasive particles, and cuts of the workpiece generated by removal of burrs). It is a separation device. The sorting mechanism 50 may be comprised so that it may classify using the specific gravity difference and airflow of dust. As the sorting mechanism 50, for example, a cyclone separator, a centrifugal classifier, or other well-known structures may be used. In the present embodiment, as the sorting mechanism 50 , a cyclone separator is used, and the bottom of the cyclone separator is connected to the storage tank 31 .

Next, a method of removing the burr will be described with further use of Figs. 2 and 3 .

(S01: Preparation process)

The deburring device 01 and the plurality of workpieces W are prepared. The abrasive grain G is previously charged in the storage tank 31 shown in FIG. The material of the abrasive grain G used in this embodiment can be suitably selected according to the material and shape of the workpiece|work W, and a processing purpose. For example, the abrasive particles G include metal or non-metal particles (shot, grid, and cut wire), ceramic particles (Al ₂ O ₃ , SiC, and ZrO ₂ ). etc.), natural stone particles (such as emery, quartzite, and diamond), plant-based particles (such as walnuts, peach and apricot seeds), and resinous particles (such as nylon, melamine, and urea) can be

Moreover, the particle diameter of the abrasive grain G can also be suitably selected according to the material and shape of the workpiece|work W, and the purpose of processing. However, the particle diameter of the abrasive grain G must be selected so that it may become a diameter which can pass through the opening part (through hole) of the processing container 10 . For example, when ceramic particles are used as the abrasive particles (G), the particle diameter of the abrasive particles (G) is F220 or #240 or more, and the particle size prescribed in JIS (Japanese Indusrial Standards) R6001; 1998 is F220 or #240 or more. It is 1000 or less, and it is selected so that it may become a diameter which can pass through the opening part (through hole) of the processing container 10.

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

By placing the plurality of workpieces W on the first surface 11a of the processing board 11 , the plurality of workpieces W are accommodated (set) in the processing container 10 . The storage capacity of the work W is determined by the property of the work W, so that the work W can be held in the processing vessel 10, and the work W can be satisfactorily flowed and stirred. It is appropriately selected according to the size of the processing container 10 . In addition, in FIG. 2, one workpiece|work W is described for convenience.

(S03: a step of stirring the workpiece)

The motor 22a is operated to rotate the processing vessel 10 . The work W accommodated in the processing vessel 10 moves along the frame 12 in accordance with the rotation of the processing vessel 10 . Since the processing vessel 10 is held at an angle, a centrifugal force in the direction toward the frame 12 and a component force of gravity along the processing plate 11 are added to the work W. When the workpiece W moves (rises) to a predetermined position, since the component of gravity becomes larger than the centrifugal force, the workpiece W moves away from the frame 12 and falls downward along the processing plate 11 . In this way, when the movement and fall of the workpiece|work W are performed continuously, the some workpiece|work W becomes a fluid state, and is stirred. In order to realize this flow state, the inclination angle α of the processing vessel 10 may be 30 to 70° or 40 to 60° with respect to the horizontal plane. When the inclination angle α of the processing vessel 10 is too small, the effect of promoting fluidization by gravity is small. If the inclination angle α of the processing vessel 10 is too large, the component of gravity with respect to the centrifugal force becomes too large, so that it becomes difficult to move the workpiece W by following the rotation of the processing vessel 10 .

In addition, if the rotation speed of the processing vessel 10 is too large, the centrifugal force becomes too strong, and it becomes difficult to drop the work W by the component force of gravity. Conversely, if the rotation speed of the processing vessel 10 is too small, the centrifugal force becomes too weak, so that it becomes difficult to move the work W by the rotation of the processing vessel 10 . In either case, the work W cannot be satisfactorily flowed. In order to properly stir the plurality of workpieces W in a fluidized state, the rotational speed of the processing vessel 10 may be 5 to 50% or 10 to 30% of the critical rotational speed. Here, the critical rotational speed means that when the rotational speed of the processing vessel 10 is increased, the centrifugal force applied to the work W becomes larger than the component of gravity, and the work W does not fall together with the frame 12 . It refers to the rotational speed at the point of rotation. When the rotation speed of the processing vessel 10 is too slow, the influence of gravity is too large compared to the centrifugal force, so that the movement of the workpiece W along the frame 12 of the processing vessel 10 is not sufficiently performed, and the As a result, the flow due to the fall of the work W is not sufficiently performed. When the rotational speed of the processing vessel 10 is too fast, the gravity is too small compared to the centrifugal force, so that the workpiece W that does not fall while being pushed to the frame 12 of the processing vessel 10 exists, There is not enough flow.

Further, by stirring the work W in a fluid state, the work W collides with each other, and the adhesion of the burr formed on the work W is weakened, so that the burr is easily removed from the work W. lose

(S04: step of generating airflow)

When the dust collector 42 is operated, the airflow toward the 2nd surface 11b from the 1st surface 11a in the vicinity of the processing board 11 will generate|occur|produce.

(S05: Rectification process)

By rectifying the flow of the airflow, it is possible to intentionally change (control) the manner in which the abrasive particles G collide or contact the work W. This step can be performed, for example, by changing the position and size of the suction unit 41 , and the suction flow rate of the dust collector 42 . In addition, as will be described later, since the speed of the abrasive grain G when the abrasive grain G collides with or comes into contact with the work W is very low, the abrasive grain G is converted into the work ( It is possible to easily change the mode of collision or contact with W). In addition, rectification|straightening process S05 may be abbreviate|omitted.

(S06: Step of adding abrasive particles)

When the abrasive particle supply mechanism 30 is operated, the abrasive particles G charged in the storage tank 31 are discharged in a fixed amount from the discharge port 32a, and are fed toward the work W (in the case of this embodiment). fall). The speed of the abrasive particles G in the direction toward the work W when the abrasive particles G are discharged from the discharge port 32a is 0 m/sec or a very small speed, so that the abrasive particles G are free-falling. Even if it collides with or comes into contact with the work W without any external force such as a suction force being applied, the burrs of the work W are not removed.

(S07: step of accelerating abrasive particles)

The abrasive particles G discharged from the outlet 32a are caused by the airflow generated in the step S04 of generating the airflow, and as shown in FIG. 2 , this airflow is area) is reached in free fall. The abrasive particles G that have reached the acceleration region A are accelerated toward the suction portion 41 so that the speed at the time of collision or contact with the workpiece W becomes a predetermined speed. The predetermined speed may be a speed at which the burrs of the work W can be removed satisfactorily, and damage and the crushing of the abrasive particles G do not occur in the work W. For example, when the Vickers hardness (JIS Z2244; prescribed in 2009) of the workpiece W is 3-200 Hv (test force is 0.2 N), this predetermined speed may be 5-30 m/sec, and 10-20 m It may be /sec. This predetermined speed is very low in order to remove the burr by contact or collision of the abrasive particles, and cannot be realized by the conventional method for removing the burr. For example, in the grinding by a blast processing apparatus, since the injection pressure is high pressure (for example, 0.2 MPa or more), the very slow speed like the predetermined speed mentioned above cannot be implement|achieved. If the spraying pressure is set very low in order to set the speed of the abrasive particles to this predetermined speed, the amount of the abrasive jetted from the nozzle is not stable, so that the finish of the work is uneven. By the burr removal method of this embodiment, since the speed of the abrasive particle G when the abrasive particle G collides with or contacts the workpiece W can be made to a very low speed, the abrasive particle at a very low speed With (G), the burr of the workpiece (W) can be removed. Adjustment of this speed can be performed by adjustment of the suction flow rate by the dust collector 42, change of the dimension and shape of the suction part 41, etc. Adjustment of the suction flow rate by the dust collector 42, for example, by changing the rotation speed of the motor built in the dust collector 42, or providing a damper for sucking the outside air to the hose 43, , by adjusting the opening degree of the damper.

(S08: Deburring the workpiece)

The abrasive grains G that have reached the acceleration region A advance toward the suction portion 41 while being accelerated, and reach the surface to be processed of the work W. After that, the abrasive particles G collide with or contact the work W, and then further advance toward the suction portion 41 . The behavior F shown in FIG. 2 shows the behavior of the abrasive grain G. An example of the aspect in which the abrasive particle G collides or contacts the workpiece|work W is demonstrated as behavior F1, F2, and F3.

Behavior F1: The abrasive particles (G) collide linearly with the burrs of the workpiece (W) and then bounce off. The burr is removed by the impact force when the abrasive grain G collides with the burr.

Behavior F2: After the abrasive particle G collides with the upper surface of the workpiece W, it advances along the upper surface. The burrs are removed by the impact force when the abrasive particles G collide with the work W and the frictional force when the abrasive particles G travel along the upper surface.

Behavior F3: The abrasive particle G advances so that it may follow the ridge part of the workpiece|work W. The burrs are removed by at least any of the impact force when the abrasive grain G collides with the ribbed portion of the work W or the frictional force when passing through the ribbed portion.

(S09: step of recovering abrasive particles)

The abrasive grains G which collided with or contacted the workpiece|work W pass through the process board 11 and move to the 2nd surface 11b side. The abrasive grain G which has moved to the 2nd surface 11b side is attracted|sucked by the dust collector 42 from the suction part 41. As shown in FIG. In that case, the microparticles|fine-particles mentioned above also pass through the process board 11 and are sucked from the suction part 41. As shown in FIG. Dusts such as abrasive particles (G) and fine particles are conveyed to the sorting device (50) through the first hose (43a). When the sorting mechanism 50 is a cyclone separator, the dust introduced so that it may follow a wall surface from the upper part of a cyclone separator falls spirally. In the process, the fine particles, which are particles with a light mass, 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 particles G, which are particles with a heavy mass, move toward the bottom of the sorting mechanism 50 and are stored in a storage tank 31 connected to the bottom of the sorting mechanism 50 . This abrasive grain G is injected|thrown-in toward the workpiece|work W again from the discharge port 32a.

As mentioned above, the abrasive grains injected from the outlet 32a in the abrasive grain supply mechanism 30 arrange|positioned at the 1st surface 11a side, and accelerated to a predetermined speed by the airflow generated by the dust collector 42. When (G) collides with or contacts the work W, the burr of the work W is removed. The abrasive particles G after colliding with or in contact with the work W are attracted by the suction portion 41 disposed on the second surface 11b side. Thereby, the abrasive grains G do not scatter to the surroundings like the blast processing method which is a conventional burr removal method. In addition, since the speed of the abrasive grain G when the abrasive grain G collides with or contacts the work W can be very slow, even when removing the burr of the work W with relatively low hardness, The burr of the work W can be removed satisfactorily without causing damage to the work W. For example, when the molded object which comprises an electronic component is made into the workpiece|work W, an electronic component with high reliability can be manufactured.

Here, the thickness of the processing board 11 may be 30-100 micrometers. When the thickness of the processing board 11 is too thin, there exists a possibility that the processing board 11 may break while removing a burr. If the thickness of the working plate 11 is too thick, the abrasive particles G pass through the working plate 11 too long, so the possibility of clogging increases, or the abrasive particles ( G) does not accelerate sufficiently. Moreover, 0.5-5.0 mm may be sufficient as the magnitude|size (ridge-angle radius) of the radius of the ridge angle which the 1st surface 11a of the processing board 11 and the frame 12 make. That is, the ribbed part formed by the 1st surface 11a of the processing board 11 and the frame 12 may be processed into the R surface with a radius of 0.5-5.0 mm. If the ridge radius is too small, the possibility that the workpiece W will be caught in the ridge portion increases, and if the ridge radius is too large, it will be difficult to fix the workpiece W in the processing vessel 10 .

In addition, in this embodiment, two values of a "suction rate" and a "passage rate" are determined. Here, the "suction ratio" is the ratio of the volume (volume/sec) of the abrasive particles fed from the abrasive grain supply mechanism 30 per unit time (volume/sec) to the suction flow rate (volume/sec) sucked by the suction mechanism 40 per unit time. points to The "passage rate" refers to the amount of abrasive particles G injected from the side of the first surface 11a per unit time toward the plurality of workpieces W in a fluid state per unit time (grams/second) to the second surface per unit time ( It refers to the ratio of the amount (gram/sec) of the abrasive grain (G) which reached the side of 11b). Here, the amount (gram) of the abrasive particles G injected from the first surface 11a side toward the plurality of workpieces W in a fluid state is the weight of the abrasive particles G discharged from the outlet 32a. points to In addition, the quantity (gram) of the abrasive grain G which reached the 2nd surface 11b side refers to the weight of the abrasive grain G which passes through the process board 11 and is sucked by the suction mechanism 40. As shown in FIG.

The suction ratio may exist in the range of 10-50 volume%. If the suction ratio is too low, the amount of abrasive particles G discharged from the discharge port 32a is small compared to the suction flow rate sucked by the suction mechanism 40, so that the burrs of the plurality of workpieces W can be sufficiently removed. none. In addition, if the suction ratio is too high, the amount of abrasive particles G discharged from the discharge port 32a is large compared to the suction flow rate sucked by the suction mechanism 40, and in the acceleration region A, the burr of the workpiece W is removed. The abrasive particles G cannot be sufficiently accelerated to the speed at which they can be removed. Moreover, the abrasive particle G and microparticles|fine-particles will scatter around.

The longer the distance passing between the plurality of workpieces W in the processing container 10 is, the longer the time for the abrasive particles G to stay between the plurality of workpieces W, and the passage rate becomes low. The passage ratio may exist in the range of 80 to 95 weight%. If the passing ratio is too high, the distance through which the abrasive particles G pass between the plurality of workpieces W is too short, so the frequency at which the abrasive particles G contact the workpiece W becomes low, and the burr of the workpiece W is lowered. can not be performed satisfactorily. In addition, when the passing ratio is too low, the distance through which the abrasive particles G pass between the plurality of works W is too long. The residence time without being accelerated becomes long, which may prevent the removal of the burr of the work W.

Next, the result of removing the deburring of the work W by the deburring device will be described. Here, the following two types were selected as the workpiece|work W, and removal of the burr|burr of a ribbed part was made into a processing objective.

Work A: Work A is a ceramic molded article formed by compression molding a composite material (SiC/Al ₂ O ₃ ) before firing. The size of the work A is 0.5 mm x 0.5 mm x 1.0 mm, and the Vickers hardness of the work A is Hv100.

Work B: Work B is a pre-fired ceramic molded article obtained by compression molding a ferrite powder having a spinel crystal structure. The size of the work B is 0.5 mm x 0.5 mm x 1.0 mm, and the Vickers hardness of the work B is Hv20.

As an apparatus, the deburring apparatus of the said embodiment was used. Moreover, as a comparative example, the conventional blast processing apparatus (The drum-type blast processing apparatus of the MY-30C type|mold made by Shinto Kogyo Co., Ltd. was modified) was used.

In this embodiment, the abrasive grain A and the abrasive grain B respectively removed the burrs of the work W. The abrasive particle A is an alumina particle having an average particle diameter of 18 µm (WA#800 manufactured by Shinto Kogyo Co., Ltd.), and the abrasive particle A has an apparent density of 4.0 g/cm ³ . The abrasive particles B are ferritic particles having an average particle diameter of 14 μm, and the abrasive particles B have an apparent density of 2.5 g/cm ³ .

After deburring the workpiece W by operating the deburring device or the blast processing device for 30 minutes, the processing state of the workpiece W was evaluated. Evaluation of the processing state was performed by respectively observing the workpiece|work used as the object of observation with a microscope (VHX-2000 manufactured by Keyence Corporation). The workpiece to be observed is sampled from the entire amount of the workpiece after burring the workpiece by accommodating the workpiece in an amount of 1/5 of the volume of the processing container (after the operation of the apparatus is finished). It is 20 works. The evaluation criteria of the processing state are as follows.

○··· In all works, burrs are removed, and there is no damage to the work (cracks and cracks, and crushing of abrasive particles).

△... There are some workpieces with some burrs, but there is no damage on all workpieces.

×··· Many burrs are not removed. Or there is a work that has taken damage.

In addition, after deburring of the work W by the deburring apparatus of the above embodiment, the periphery of the processing vessel 10 was observed. After deburring the workpiece W by the blast processing apparatus, the periphery of the drum was observed. And when adhesion of abrasive particles is not confirmed around the processing container 10 or around the drum, the scattering of the abrasive particles is evaluated as "○", and the abrasive particles are placed around the processing container 10 or around the drum. When adhesion of was confirmed, evaluation of the scattering of abrasive grain was made into "x". Similarly, when a workpiece is not recognized around the processing container 10 or around the drum, the evaluation of the scattering of the workpiece is set to "○", and when a workpiece is confirmed around the processing container 10 or around the drum Evaluation of scattering of the work was made into "x".

The result of the said evaluation in each condition is shown in Table 1. Regarding the items of the apparatus in Table 1, "inclination angle" represents the inclination angle α (°) of the processing vessel 10 with respect to the horizontal plane in the deburring apparatus of the embodiment, as shown in FIG. 1 , and blast processing The device indicates the angle of inclination of the drum with respect to the horizontal plane. In addition, "rotation speed" represents the ratio (%) of the rotation speed with respect to the critical rotation speed. In addition, as for the "speed" of the abrasive grain, the three-dimensional velocity of the abrasive grain immediately before contacting the workpiece W under each condition is measured by a flow rate measuring system (PIV system manufactured by Flowtech Research Co., Ltd.). Preliminary measurement results are described. In addition, "thickness" indicates the thickness (μm) of the processing plate 11 , and the “ridge radius” is the size of the radius of the ridge formed by the first surface 11a of the processing plate 11 and the frame 12 . (mm) is indicated.

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

By measuring in advance the amount of abrasive particles injected from the first surface 11a side per unit time toward the plurality of workpieces W in a fluid state, and the amount of abrasive particles reaching the second surface 11b side per unit time, The pass rate was calculated. Specifically, the passing ratio was calculated by measuring the following (1) and (2) when the deburring apparatus was operated for 1 minute using the fired product of the burr-free work A as the work.

(1) Amount of abrasive particles discharged from the outlet 32a of the abrasive particle supply mechanism 30 (Amount of abrasive particles fed from the side of the first surface 11a per unit time toward the plurality of workpieces W in a fluid state per unit time) )

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

Here, the reason why the fired product of the burr-free work A is used as the work W is to make it difficult to generate chips such as burrs in the work W.

[Table 1]

First, in the deburring apparatus of the above embodiment, the inclination angle of the processing vessel 10 is 45°, the rotation speed is 30%, the thickness of the processing plate 11 is 40 μm, and the processing plate ( 11), the ridge radius is 1.0 mm, the speed of the abrasive particles is 15 m/sec, and the suction ratio is 30% as reference conditions. In the deburring apparatus of the above embodiment, the deburring of the work A was performed using the abrasive grains A while the suction ratio was changed between 5 and 60 vol% among the reference conditions (Examples 1 to 5). Moreover, in the deburring apparatus of the said embodiment, the suction ratio among the reference conditions was changed between 5-60 volume%, and the abrasive grain B was used to remove the burr of the work B (Examples 17-21) . When the suction ratio was between 10 and 50% by volume, regardless of the type of the work, the evaluation of the processing state was “○” or “Δ” (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 became “x” (Examples 4 and 5 and Examples 20 and 21).

Next, from the above reference conditions, any one of "inclination angle", "rotation speed", "speed", "thickness" and "ridge radius" was sequentially changed, and the burrs of the workpieces A and B were removed (implemented). Examples 6-15 and Examples 22-31). In addition, the abrasive grain A was used for the removal of the burr of the work A, and the abrasive grain B was used for the removal of the burr of the work B. As a result, all evaluation of the processing state became "circle" or "triangle|delta". In the embodiment in which the evaluation of the processing state is "Δ", since some burrs remain on the work and the work is not damaged, by further lengthening the processing time, the evaluation of the processing state is "○" indicates what could be.

Among Examples 1 to 15 and Examples 17 to 31 described above, in Examples (Examples 1 to 3, Examples 6 to 19, and Examples 22 to 31) in which the evaluation of the processing state was “○” or “Δ” In contrast, the passing ratio was 80 to 95% by weight. Therefore, the burr can be removed favorably with the passage ratio in this range.

In the deburring apparatus of the above embodiment, the deburring of the work A was performed under the above reference conditions using ferritic abrasive grains B, which are different materials from alumina, which is the material of the work A, but ferrite Since the alumina was harder, the burr could be removed satisfactorily without abrasive grains being lodged in the work (Example 16). On the other hand, using alumina abrasive grains A different from the ferritic material of the work B, the burrs of the work B were removed under the above reference conditions. . This is considered to be because ferrite is softer than alumina. For this reason, it has been found that, when removing burrs from ferritic workpieces, using ferritic abrasive particles of a homogeneous material or abrasive particles made of a material softer than ferrite can remove burrs more favorably.

In Examples 1 to 32, as a result of observing the periphery of the processing vessel 10 after the deburring treatment, adhesion of abrasive particles to the periphery of the processing vessel 10 and the drop of the workpiece W were not confirmed. . Accordingly, it was found that the deburring apparatus of the above-described embodiment can remove the burr from the work W without scattering the abrasive particles to the surroundings and without blowing the work off.

On the other hand, when the burr removal process of the workpiece W was performed in the blast processing apparatus, the burr of the workpiece W was removed, but damage to the workpiece W occurred, and the evaluation of the processing state became "x" ( Comparative Example 1 and Comparative Example 2). In addition, when the periphery of the drum, ie, the processing chamber, was observed after the deburring treatment, adhesion of abrasive particles to the wall surface of the blast processing chamber was confirmed, and the evaluation of the scattering of the abrasive particles was “x”. Furthermore, when the classification mechanism connected to the blast processing apparatus was confirmed, the mixture of the workpiece|work W was confirmed. This indicates that, depending on the properties of the work W, the work was blown out of the drum during the deburring process.

[Industrial Applicability]

According to the above embodiment, a new method for removing burrs can be provided. In this burr removal method, the abrasive particles are accelerated to a predetermined speed by an airflow to impart kinetic energy suitable for burr removal to the abrasive particles. is removed And the whole amount of these abrasive grains and microparticles|fine-particles is collect|recovered from a suction member. Thereby, the following effects are obtained.

(1) Abrasive particles do not scatter around.

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

(3) The speed of the abrasive grains is about 10 to 30 m/sec, so that the burr removal treatment of the work can be performed with the abrasive grains at a very low speed. can be done

In addition, the burr removal method of one embodiment can be favorably applied also to a workpiece|work with comparatively low hardness (for example, copper, aluminum, etc.).

01… deburring device, 10… processing vessel,
11… processing board, 11a... 1st side,
11b… 2nd side, 12... frame,
20… agitation mechanism, 21... lack of maintenance,
22… rotating mechanism, 22a... motor,
22b... Rotational force transmitting member, 30... abrasive grain feeder,
31… storage tank, 32... export,
32a… Outlet, 40… suction device,
41… Suction section, 42 . . . Dust Collector,
43… hose, 43a... first hose;
43b… 2nd hose, 50... sorting device,
A… Acceleration area, F(F1, F2, F3)... behavior of abrasive particles,
G… Abrasive particles, W… work.

Claims (18)

A burr removal method for removing the burr of an object to be treated, comprising:
A process of preparing a deburring apparatus including a processing container, an abrasive grain supply mechanism for injecting abrasive grains, and a suction mechanism for generating a suction force, and a plurality of to-be-processed products;
setting the plurality of to-be-processed products in the processing container;
agitating the plurality of to-be-processed products set in the processing container;
a step of introducing the abrasive grains from the abrasive grain supply mechanism toward the plurality of to-be-processed objects in a stirred state in a free fall;
The abrasive particles injected toward the plurality of workpieces in a stirred state are accelerated to a predetermined speed by the airflow generated by the operation of the suction mechanism, and the abrasive particles are accelerated to the plurality of target objects. A burr removal method comprising the step of contacting or colliding with the treated article to remove the burrs of the plurality of to-be-processed articles. The method according to claim 1,
Each of the plurality of to-be-processed products is a burr removal method which can be obtained by molding the raw material powder or by calcining the raw material powder after molding. 3. The method according to claim 2,
A method for removing burrs, wherein each of the plurality of to-be-processed products is a ceramic or magnetic material formed by a powder forming method. 4. The method according to any one of claims 1 to 3,
In the step of stirring the plurality of to-be-processed objects, the burr removal method of stirring the plurality of to-be-processed objects by making the said plurality of to-be-processed objects set in the said processing vessel into a fluid state. 4. The method according to any one of claims 1 to 3,
The processing vessel,
A processing plate having a first surface and a second surface that is a surface opposite to the first surface;
In the first surface of the processing plate, a frame surrounding the peripheral edge of the processing plate is provided;
A plurality of through-holes passing through the processing plate in a direction from the first surface to the second surface are provided in the processing plate,
Each of the plurality of through-holes has a size through which the abrasive particles can pass and through which each of the plurality of to-be-processed objects cannot pass,
In the step of setting the plurality of to-be-processed products in the said processing container, the burr removal method of mounting the said plurality of to-be-processed objects on the said 1st surface. 6. The method of claim 5,
The thickness of the processing plate is 30 ~ 100㎛,
A burr removal method in which the ribbed portion formed by the first surface of the processing plate and the frame is processed into an R surface having a radius of 0.5 to 5.0 mm. 6. The method of claim 5,
The suction mechanism is disposed on the second surface side,
and the airflow is an airflow from the first surface toward the second surface. 6. The method of claim 5,
Further comprising the step of recovering the abrasive particles,
In the step of removing the burrs of the plurality of to-be-processed products, the abrasive grains are fed from the first surface side toward the plurality of to-be-processed products,
In the step of recovering the abrasive particles, the abrasive particles that have reached the second surface are sucked and recovered by the suction mechanism. 6. The method of claim 5,
The ratio of the amount of the abrasive grains reaching the second surface per unit time to the amount of the abrasive grains fed from the first surface side toward the plurality of to-be-processed products being stirred per unit time is 80 to 95 A method of removing burrs in weight percent. 6. The method of claim 5,
The ratio of the volume of the abrasive grains injected from the first surface side toward the plurality of to-be-processed objects per unit time to the suction flow rate sucked by the suction mechanism per unit time is 10 to 50 vol%. 4. The method according to any one of claims 1 to 3,
In the step of stirring the plurality of to-be-processed items, the burr removal method in which the fixing force of the said burr becomes weak by stirring the said plurality of to-be-processed objects. 4. The method according to any one of claims 1 to 3,
A burr removal method, wherein the speed of the abrasive particles when the abrasive particles come into contact with or collide with the plurality of to-be-processed objects is 5 to 30 m/sec. 4. The method according to any one of claims 1 to 3,
Further comprising the step of rectifying the air flow,
In the rectifying step, the burr removal method controls the mode in which the abrasive particles contact or collide with the plurality of to-be-processed objects by rectifying the airflow. 4. The method according to any one of claims 1 to 3,
In the step of stirring the plurality of to-be-processed objects, the processing vessel is inclined at a predetermined angle and the processing vessel is rotated to thereby agitate the plurality of to-be-processed objects. 15. The method of claim 14,
The predetermined angle is a burr removal method of 30 to 70 °. 15. The method of claim 14,
The rotation speed of the processing vessel is 5 to 50% of the critical rotation speed. 4. The method according to any one of claims 1 to 3,
One side of each of the plurality of to-be-processed items is a burr removal method of 100 to 1600 μm. A deburring device for removing burrs from an object to be treated, comprising:
A processing container for setting a plurality of to-be-processed products;
a stirring mechanism for stirring the plurality of to-be-processed objects set in the processing vessel;
an abrasive grain supply mechanism for injecting abrasive grains toward the plurality of to-be-processed objects in a state of being stirred by the stirring mechanism;
a suction mechanism for generating an airflow from the abrasive grain supply mechanism toward the processing vessel by means of a suction force;
The abrasive grain supply mechanism injects the abrasive grains in free fall toward the plurality of to-be-processed objects in a stirred state;
The said suction mechanism accelerates the said abrasive grain injected toward the said plurality of to-be-processed objects by the said abrasive grain supply mechanism to a predetermined|prescribed speed with the said airflow, and, while accelerating the said abrasive grain accelerated to the said plurality of to-be-processed A deburring device for removing burrs from the plurality of to-be-processed items by contacting or colliding with them.

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