JP2018187734A - Polishing body for barrel polishing, barrel polishing method, and method for manufacturing the polishing body - Google Patents

Abstract

In a polishing body for barrel polishing, a polishing body for barrel polishing having a high cutting ability without roughening a workpiece more than necessary is provided. An abrasive body M is a sintered body in which abrasive particles G are bonded together by a bonded body B formed by melting or semi-melting homogeneous particles. The main component of the combination B is a material different from the abrasive particles G, and the hardness of the combination B is lower than the hardness of the abrasive particles G. The polishing method using the polishing body M includes a step in which the polishing body M comes into contact with the workpiece, and the combined body B absorbs the collision energy when the polishing body M comes into contact with the workpiece, and abrasive particles. A step of cutting the workpiece by G and a step of detaching the abrasive particles G located on the outer surface of the polishing body M. [Selection] FIG.

Description

  The present invention relates to a polishing body used for barrel polishing performed for deburring, rounding, smoothing, and glossing of a workpiece, a barrel polishing method using the polishing body, and a method for manufacturing the polishing body About.

  In barrel polishing, work (polishing, vibration, planetary motion, etc.) is given to the barrel tank after the work piece, the polishing body, and if necessary, a polishing aid and water in the case of wet polishing are put into the barrel tank. Thus, the “mass” formed with these input materials is stirred and fluidized, and the workpiece is polished by contact between the workpiece and the polishing body.

  As a polishing body for barrel polishing, a type in which abrasive particles are molded with a vitrified binder and a type in which abrasive particles are molded with a resin are widely used. (Patent Document 1)

  Abrasive bodies obtained by molding abrasive particles with a vitrified binder are classified into two types depending on the production method. In the first type, clay and porcelain containing abrasive particles are kneaded and formed into a fixed shape and dimensions and fired at a high temperature. This type of abrasive may have a relatively low crushing strength and may be crushed. As a result, the workpiece may be damaged by the crushed abrasive.

  In the second type, fine alumina powder containing alumina abrasive particles is kneaded and formed into a fixed shape and size and sintered at a high temperature. This type of abrasive body has a relatively high crushing strength and is not easily crushed, but has a side face that cannot maintain cutting ability for a long time. Moreover, since the heat storage property of the polishing body is high, the mass becomes high as the polishing time elapses. For this reason, there arises a problem that the performance of the polishing aid is deteriorated or the internal pressure of the barrel tank is increased when polishing with a closed type barrel polishing machine.

  In addition, an abrasive body obtained by molding abrasive particles with a resin is obtained by molding a polymer material containing the abrasive particles and kneading them into a certain shape and size and curing them. This type of polishing body can perform polishing with less occurrence of dents on the workpiece due to collision of the polishing body, but has a low cutting ability because of its low specific gravity. In addition, the resin used is expensive.

JP-A-60-242960

  Each conventional abrasive has advantages and disadvantages. An object of this invention is to provide the abrasive | polishing body for barrel grinding | polishing which does not roughen a to-be-processed object more than necessary, and has high cutting ability.

  One aspect of the present invention is a polishing body used for barrel polishing. This abrasive body is a sintered body in which abrasive particles are bonded together by a bonded body formed by melting or semi-melting homogeneous particles. The main component of the combined body is a material different from the abrasive particles, and the hardness of the combined body is lower than the hardness of the abrasive particles.

One aspect of the present invention is a barrel polishing method using the above-described polishing body. This barrel polishing method includes the following steps (1) to (3).
(1) A step of putting a polishing body, a workpiece, and, if necessary, a polishing aid and water into a barrel tank.
(2) A step of fluidizing a mass formed by the polishing body, the workpiece, and the polishing aid and water added as necessary.
(3) A step of polishing the workpiece.
And (3) The process of grind | polishing to-be-polished material includes the process of following (4) (5).
(4) A step in which the bonded body absorbs collision energy when the abrasive body comes into contact with the workpiece, and the workpiece is cut by the abrasive particles.
(5) A step in which abrasive particles located on the outer surface of the polishing body are detached.

One aspect of the present invention is a method for producing an abrasive. The manufacturing method of this polishing body includes the following steps (1 to (3)).
(1) A step of kneading the abrasive particles weighed to a predetermined ratio and the particles constituting the bonded body while adjusting the water content to obtain a mixed material. (2) Molding the mixed material into a predetermined shape. (3) A step of firing the molded product. This step includes a step in which the particles constituting the bonded body are bonded to each other, and the abrasive particles are bonded to each other through the bonded body.

By making the configuration of the abrasive body a structure in which the abrasive particles are bonded to each other by a bonded body, it is possible to ensure a high cutting ability as compared with a type of abrasive body in which the abrasive particles are molded with a resin. Can be manufactured inexpensively.
Moreover, the bonding force between the particles is increased by forming the bonded body by melting or semi-melting the same particles. As a result, a polishing body having higher strength than that of a type using clay or porcelain as a vitrified bonded body can be obtained.
Furthermore, when the main component of the combined body is made of a material having different abrasive particles, the abrasive particles on the surface layer are detached as the polishing progresses, and new abrasive particles are exposed. That is, the cutting ability is demonstrated over a long period of time without clogging (abrasive powder accumulates between abrasive particles exposed on the surface) or crushing (only abrasive particles exposed on the surface wear). be able to. And, since the hardness of the bonded body is lower than the hardness of the abrasive particles, the bonded body exposed on the surface due to the removal of the abrasive particles is relatively destroyed, so that the spilled particles (the abrasive grains remain detached). Of the surface). That is, the polishing power can be maintained for a long time as compared with a polishing body using alumina powder as a vitrified bonded body.

  In one embodiment of the present invention, the content of abrasive particles may be 20 to 50 wt%. An appropriate cutting ability can be ensured.

  In one embodiment of the present invention, the average particle diameter of the particles of the conjugate may be 0.1 to 10 μm. Since the bonding force between the particles of the bonded body is improved, the bonding force of the abrasive particles is improved.

  In one embodiment of the present invention, the main component of the combined body may be silicon dioxide, and the abrasive particles may be alumina. By using silicon dioxide, it is possible to suppress heat accumulation in the polishing body even if the mass temperature rises during polishing.

  The polishing body and barrel polishing method for barrel polishing according to one aspect or one embodiment can maintain a high polishing ability for a long time and can appropriately polish a workpiece.

It is a schematic diagram which shows an example of the shape of the grinding | polishing body for barrel grinding | polishing of one Embodiment. It is a flowchart explaining the manufacturing method of the abrasive | polishing body for barrel grinding | polishing of one Embodiment. It is a mimetic diagram explaining the barrel polisher used in one embodiment. It is a flowchart explaining the barrel grinding | polishing method of one Embodiment. It is a schematic diagram which shows the cross-sectional shape of the grinding | polishing body of one Embodiment. It is a graph which shows the test result regarding the grinding | polishing body of one Embodiment. It is a graph which shows the test result regarding the grinding | polishing body of one Embodiment.

  An embodiment of a barrel polishing body (hereinafter referred to as “media”) and a barrel polishing method of the present invention will be described with reference to the drawings. The present invention is not limited to the present embodiment, and changes, modifications, and improvements can be made without departing from the scope of the invention. In addition, the left-right and up-down direction in description points out the direction in a figure unless there is particular notice.

  FIG. 1 is a perspective view illustrating an example of a medium M according to an embodiment. The medium M according to the present embodiment is formed into an arbitrary shape such as a column shape, a spherical shape, or a cone shape of several millimeters to several tens of millimeters according to the purpose of polishing. The example of the shape is shown to Fig.1 (a)-(d). 1A is a triangular prism shape, FIG. 1B is a cylindrical shape, FIG. 1C is a column shape having a substantially Y-shaped cross section, FIG. 1D is a spherical shape, and FIG. A conical shape, FIG. 1 (f) shows a quadrangular pyramid shape. In addition, although not illustrated, in the case of a column shape, a shape (vertical cross-sectional shape is a parallelogram) obtained by obliquely cutting the end portions (left and right ends in FIG. 1) may be used.

The media M of one embodiment is one in which abrasive particles G are bonded through a bonded body B. Specifically, it is obtained as follows (see FIG. 2).
(1) Particles constituting abrasive particles G and combined body B (hereinafter referred to as “combined particles”, but weighed so as to have a predetermined blending ratio.
(2) These are kneaded while adjusting the water content with water or the like to obtain a mixed material.
(3) The mixed material is molded into a predetermined shape by molding means to obtain a molded product. The molding includes granulation by a granulator such as a pelletizer other than extrusion molding and cast molding. Molding may be appropriately selected from other known methods.
(4) The molded product is dried to a predetermined moisture content.
(5) The dried molded product or granulated product is fired in a heating furnace. By firing while controlling the temperature and time so as to obtain a predetermined heat pattern, the conjugate particles are in a molten or semi-molten state, and the conjugate particles are combined to form a conjugate B. The abrasive particles G are bonded to each other through the bonded body B to form a sintered body.
(6) After firing, it is cooled with a predetermined heat pattern.
(7) After cooling, they are put into a rotating container or a barrel grinder and are jointed. This step is performed as necessary and may be omitted.

  The conjugate in the weighing step may be in the form of particles or in a state where the particles are dispersed in a liquid such as water. In any state, the particles are homogeneous. That is, it is different from mixing of particles having a plurality of compositions such as clay. By using the same particles as the particles of the bonded body, the binding force of the abrasive particles G is improved.

  When the main component of the particles of the conjugate B is 50% by mass, the affinity between the particles of the conjugate B is improved, so that the binding force of the abrasive particles G is improved.

  When the particle size (average particle size d50) of the particles of the combined body B is 0.1 to 20 μm, preferably 0.1 to 10 μm, the contact area between the particles increases, so that the binding force of the abrasive particles G is improved. To do.

  In barrel polishing, a large amount of polishing powder (powder generated by wear of workpiece cutting powder or media M) is generated during polishing, and this polishing powder enters the gaps between the abrasive grains. When the bonding force between the abrasive particles G is stronger than necessary, the abrasive powder that has entered the gap is held in the medium M as it is, and so-called “clogging” occurs.

  Alternatively, when the bonding force between the abrasive particles G is stronger than necessary, the abrasive particles G exposed on the surface wear without being detached, so-called “collapse” occurs.

  As a result, the polishing power of the medium M as a whole decreases. If the bonding force is appropriate, the abrasive powder G located on the surface layer is detached during polishing, and the abrasive powder is also detached from the surface of the medium M, so that clogging does not occur. By making the abrasive particles G and the bonded body B from different materials, it is possible to secure an appropriate bonding force and suppress the occurrence of clogging and crushing.

  If the bonded body B is too hard, when the abrasive particles G are detached during barrel polishing and the bonded body B is exposed on the surface, the bonded body B does not break down. As a result, on the surface of the medium M, so-called “spilling” occurs in which the bonded body B with the abrasive grains detached is exposed. By making the hardness of the bonded body B lower than the hardness of the abrasive particles G, it is possible to suppress the occurrence of spillage.

  If the content of the abrasive particles G is too low with respect to the media M, the polishing power is insufficient. If it is too high, the content of the binder B is relatively low, so that the bonding force between the abrasive particles G is insufficient. As a result, the abrasive material is detached more than necessary during the polishing, so that the media M is greatly worn. Furthermore, the media M itself may be cracked or chipped. In the present embodiment, the content of the abrasive particles G is 20 to 50 wt%.

  In barrel polishing, the medium M and the workpiece repeatedly collide violently, so heat is generated by the collision. If the thermal conductivity of the medium M is high, the medium M absorbs this heat. That is, the generated heat is prevented from radiating to the atmosphere, and instead, the medium M stores heat. As a result, when a polishing aid is added, performance deterioration due to heat occurs.

  Further, in wet barrel polishing, when the heat capacity of the medium M is large, more water vapor is generated. Therefore, for example, when polishing is performed in a sealed barrel tank such as a centrifugal barrel or a rotating barrel, the internal pressure of the barrel tank increases. .

  In the medium M, the combination B contains a considerable amount. In view of the above, the material of the combined body B is determined in consideration of hardness, thermal conductivity, specific heat, and specific gravity. In this embodiment, the main component of the combination B is silicon dioxide, and the abrasive particles G are alumina.

  Next, a barrel polishing method using the medium M according to an embodiment will be described. In this embodiment, the case where wet barrel polishing is performed by the barrel polishing machine shown in FIG. 3 is illustrated.

  The barrel polishing machine 10 shown in FIG. 3 is a so-called centrifugal barrel polishing machine in which the barrel tank moves in a planetary motion. This barrel polishing machine 10 includes four barrel tanks 11 into which masses are charged, four barrel tank cases 12 to which the barrel tanks 11 are detachably fixed, and a pair for rotatably fixing the barrel tank case 12. Turret 13 (revolution disk), a revolution shaft 14 fixed to the center of the turret 13, a drive mechanism 15 for rotating the turret 13 about the revolution shaft 14, and a barrel driven by the rotation of the turret 13. And a driven mechanism 16 that rotates the tank case 12. In FIG. 1, only three barrel tanks 11 and three barrel tank cases 12 are illustrated for convenience.

  The barrel tank 11 is a hollow container that defines a space having an octagonal cross-sectional shape therein, a barrel tank body having an open top surface, and a barrel tank lid that covers the opening and seals the internal space. And. The barrel tank 11 whose inside is sealed is detachably fixed to the barrel tank case 12.

  Each barrel tank case 12 is provided with a rotation shaft 12a at both ends. Moreover, it has the structure which can fix the barrel tank 11 by which the inside was sealed detachably.

  The pair of turrets 13 have a disk shape and are provided so as to face each other. A hole through which the revolution shaft 14 can be inserted is formed at the center of the plane of each turret 13, and a first bearing 13a into which the revolution shaft 14 can be rotatably fitted is provided in each hole. Each turret 13 is rotatably supported by a revolving shaft 14 fixed to a shaft holder 14a via a first bearing 13a. Each turret 13 is provided with a plurality of second bearings 13b at equal intervals along the circumferential direction. These second bearings 13b are individually fitted to the rotation shafts 12a of the plurality of barrel tank cases 12, and each rotation shaft 12a is rotatably supported. That is, the pair of turrets 13 are arranged so as to sandwich the barrel tank case 12 via the rotation shaft 12a and the second bearing 13b, and are fixed to the revolution shaft 14 inserted through the center. With this configuration, the four barrel tank cases 12 are disposed between the turrets 13 at equal intervals and relatively rotatable with respect to the turret 13.

  The drive mechanism 15 includes a drive motor 15a, a motor pulley 15b, a revolution pulley 15c, and a drive belt 15d. The motor pulley 15b is fixed to the rotating shaft of the drive motor 15a. The revolution pulley 15 c is provided on the outer periphery of one turret 13 (left side in FIG. 1) of the pair of turrets 13. The drive belt 15d is bridged between the motor pulley 15b and the revolution pulley 15c.

  The driven mechanism 16 includes a drive pulley 16a, a driven pulley 16b, and a driven belt 16c. The drive pulley 16 a is fixed to the revolution shaft 14. The driven pulley 16b is fixed to the rotation shaft 12a. The driven belt 16c is stretched between the driving pulley 16a and the driven pulley 16b.

  When the drive motor 15a is operated, the turret 13 rotates about the revolution shaft 14. As the turret 13 rotates, the barrel tank 11 fixed to the barrel tank case 12 turns (revolves) around the revolution shaft 14. The barrel tank 11 is rotated (spinned) by the driven mechanism 16 in the direction opposite to the rotation direction of the turret 13 with the rotation shaft 12a as the axis.

  As described above, the barrel tank 11 can perform rotation by its own rotation and revolution by the rotation of the turret 13, that is, planetary motion.

A barrel polishing method using the centrifugal barrel polishing machine 10 will be described with reference to FIGS.

S1: The process put into a barrel tank The to-be-processed object, the medium M, water, and the grinding | polishing adjuvant were thrown into each barrel tank main body. These are the substances that form the mass. After the charging, the barrel tank lid was fixed, and the space inside the barrel tank 11 was sealed. Thereafter, the barrel tank 11 is fixed to the barrel tank case 12 respectively.

The polishing aid is appropriately selected according to the purpose. The purpose is exemplified below.
(A) Improvement of polishing power (b) Cleaning of polishing media and maintenance of polishing power (preventing clogging of polishing media)
(C) Cleaning the workpiece (d) Improving the gloss of the workpiece (e) Removing the scale of the workpiece.
(F) Removal of fats and oils from the workpiece (g) Add rust prevention effect to the workpiece or prevent discoloration of the workpiece (h) Prevent formation of hitting marks on the workpiece surface (i) Water Softening (j) When the work piece is a hard and brittle material, suppression of chipping

S2: Step of fluidizing the mass When the barrel polishing machine 10 is operated, the barrel tank 11 performs planetary motion. Due to this movement, the mass including the workpiece and the polishing medium M becomes fluidized.

S3: Process of polishing the workpiece When the mass is in a fluidized state, the media M and the workpiece repeat contact and collision. The workpiece is polished by this contact and collision.

  FIG. 5 shows a cross section of the medium M. The upper surface in the figure is the outer surface of the medium M, and the outer surface is formed with irregularities by the abrasive particles G. When the planetary movement of the barrel tank 11 is continued, the workpiece comes into contact with the polishing medium M. At this time, the workpiece is cut by the convex portions of the abrasive particles G. During cutting, fine powder such as cutting powder of the workpiece is generated. Since the fine powder is smaller than the recess formed by the abrasive particles G, the fine powder enters the recess. In this state, when the medium M further repeatedly collides with the workpiece and the wall surface of the barrel tank 11, the cutting powder that has entered the recess is more firmly pressed. That is, the outer surface of the medium M becomes clogged and the unevenness disappears, so that the cutting force of the medium is deteriorated. If the collision between the medium M and the workpiece is repeated in this state, a dent is generated on the surface of the workpiece rather than polishing.

  In addition, when the predetermined abrasive particles G remain fixed on the surface of the medium M, the abrasive particles G are worn by contact with the workpiece, and the convex portions disappear. As a result, the outer surface of the medium M becomes clogged and the irregularities disappear, so that the cutting force of the medium is deteriorated. If the collision between the medium M and the workpiece is repeated in this state, a dent is generated on the surface of the workpiece rather than polishing.

  Since the medium M of the embodiment is made of different materials such as the abrasive particles G being alumina and the main component of the binder B being silicon dioxide, the medium M has an appropriate bond strength compared to conventional sintered media. . Accordingly, the surface abrasive particles G are detached before becoming clogged or clogged. At that time, the fine powder that has entered the recess is also detached, and abrasive particles having a high cutting ability appear on the surface layer of the medium M. Since this movement repeatedly occurs during barrel polishing, the medium M according to an embodiment can maintain a high polishing ability for a long time.

  Further, the medium M according to an embodiment is a sintered body in which homogeneous particles are melted or semi-molten to form a bonded body B, and abrasive particles are bonded to each other through the bonded body B. Furthermore, the average particle diameter of the particles is 0.1 to 10 μm. In the case of a type of media using clay or porcelain as a conventional vitrified conjugate, clay and porcelain are formed by a combination of different particles, and the average particle size of the particles constituting the conjugate is large. The particle size distribution of the particles is broad. Accordingly, the media M of the embodiment has a stronger bonding force between the abrasives than the conventional media of the type using clay or porcelain as the vitrified bonded body. It is possible to prevent the media M from being cracked or chipped due to insufficient power.

  Most of the particles constituting the combined body B may be particles of the same quality, and foreign particles are allowed to be mixed within a range that does not affect the binding force of the particles.

  Since the medium M of the embodiment has a lower hardness of the bond B than the conventional medium of the type using alumina powder as the vitrified bond, the bond B exposed on the surface due to the desorption of the abrasive particles G is destroyed. Advances. As a result, the new abrasive particles G are exposed on the surface, so that there is no spillage and high polishing ability can be maintained for a long time.

  Since the medium M of one embodiment has silicon dioxide as a main component as the binder B, the heat storage property is lower than that of a conventional medium using alumina powder as the vitrified binder. Therefore, the increase in the temperature of the mass can be reduced, so that the performance deterioration of the polishing aid can be reduced.

  Since the medium M of one embodiment has silicon dioxide as a main component as the binder B, the heat capacity is lower than that of a conventional medium using alumina powder as the vitrified binder. Therefore, since generation | occurrence | production of water vapor | steam can be suppressed, the raise of the internal pressure of a barrel tank can be reduced.

S4: Step of recovering the workpiece After a predetermined time has elapsed, the operation of the barrel polishing machine 10 is stopped. And the barrel tank 11 is removed from the barrel tank case 12, the fixation of the barrel tank lid is released, and the contents are taken out. After separating the contents into the media and the workpiece, the workpiece is washed. This is dried to complete a series of barrel polishing steps.

  Next, the test results of barrel polishing with the media of one embodiment will be described.

  The workpiece used was an S45C material of φ22 × 15 mm. For the workpiece, the arithmetic average roughness Ra (hereinafter referred to as “surface roughness”) defined in JIS B0601 (1994) was previously adjusted to 0.005 μm by sandpaper and feather finishing.

The abrasive media is an abrasive media according to an embodiment, wherein the abrasive particles are alumina, the main component of the binder is silicon dioxide, and the content of the abrasive particles is adjusted to 10 to 60%. Prepared.
For comparison, a conventional fired medium (Comparative Example 1) and a sintered medium (Comparative Example 2) were prepared. The abrasive particles of Comparative Example 1 and Comparative Example 2 were both alumina and the content was 40% by mass.

  Both the embodiment and the conventional media have a spherical shape of φ5 mm.

  In each of the four barrel tanks with 8L of content stone, one workpiece, a plurality of media such that the apparent volume is 37-65% of the barrel tank, Water and 15 to 50 ml of polishing aid were respectively added.

After polishing for 60 minutes with a barrel polishing machine, the workpiece and media were collected. Then, the following evaluation was performed. In addition, the measurement was performed for each barrel tank, and the average value was evaluated.
<Polishing amount>
The weight of the workpiece was measured before and after polishing, and the difference was calculated.
<Surface roughness>
The surface roughness Ra was measured with a contact-type surface roughness measuring instrument.
<Media wear rate>
The total weight of the media was measured before and after polishing, and the weight difference before and after polishing with respect to the weight before polishing was calculated. The polished media were measured after drying for 15 minutes in a centrifugal dryer.

  The results will be described with reference to FIGS. In FIG. 6, compared with the media (Example) of one embodiment, Comparative Example 1 showed large results in all of the polishing amount, surface roughness, and wear rate. This indicates that the conventional fired media has a strong polishing force but a large amount of wear and a rough surface of the workpiece. Comparative Example 2 is the opposite, and the polishing amount, surface roughness, and wear rate were all greater than those of the Examples. Compared with Comparative Example 1, the Example was close to Comparative Example 2.

  FIG. 7 is a graph showing stability during continuous use in a medium having a content of abrasive particles of 40%. This graph is a result of a test in which only the same medium was used and the above barrel polishing was repeated. In the example, the polishing amount was the same for all three times, whereas in Comparative Example 2, it was found that the polishing force decreased with each use.

  As a result, the media according to the embodiment has an advantage that the surface of the workpiece is not roughened more than necessary and the wear due to polishing is less than that of the conventional fired media. Moreover, compared with the conventional sintered media, it is excellent in all of the polishing amount, the surface roughness adjusting force, and the wear amount, and has an advantage of having a high polishing ability for a long time. Therefore, it can be seen that the media according to the embodiment has high performance that is not found in conventional media.

  Moreover, the influence of the content rate of the abrasive particles in the media of one embodiment will be described. The dotted line in FIG. 6A is an approximate straight line indicating the polishing amount of the example. As shown in the figure, the polishing amount when the content is 10% by mass is below this approximate line, indicating that the polishing progress is slow. Further, the polishing amount in the case of 50% by mass is less than this approximate straight line, indicating that the polishing amount does not increase in proportion even if the abrasive particles are increased. The content of the abrasive particles is comprehensively determined in consideration of the relationship with the surface roughness adjusting force and the amount of wear, but it has been found that generally good results are obtained when the content is 20 to 50% by mass.

  In the above description, barrel polishing by a centrifugal barrel polishing machine has been described as an example. However, the media of one embodiment can be used for any barrel polishing such as a rotating barrel, a vibrating barrel, and a fluidized barrel. Further, it can be used not only for wet but also for dry barrel polishing.

DESCRIPTION OF SYMBOLS 10 Barrel grinder 11 Barrel tank 12 Barrel tank case 12a Rotating shaft 13 Turret 13a First bearing 13b Second bearing 14 Revolving shaft 15 Drive mechanism 16 Drive mechanism B Conjugate G Abrasive particle M Media (Abrasive)

Claims (6)

A polishing body used for barrel polishing,
The abrasive body is a sintered body in which abrasive particles are bonded together by a bonded body formed by melting or semi-melting homogeneous particles,
The main component of the combined body is a material different from the abrasive particles,
A polishing body for barrel polishing, wherein the hardness of the bonded body is lower than the hardness of the abrasive particles.   The abrasive for barrel polishing according to claim 1, wherein the abrasive particles are contained in an amount of 20 to 50 wt%.   The abrasive body for barrel polishing according to claim 1 or 2, wherein an average particle diameter of particles constituting the combined body is 0.1 to 10 µm.   The abrasive body for barrel polishing according to any one of claims 1 to 3, wherein a main component of the bonded body is silicon dioxide, and the abrasive particles are alumina. A barrel polishing method using the polishing body according to any one of claims 1 to 4,
A step of charging the abrasive body, the workpiece, and, if necessary, a polishing aid and water into a barrel tank;
Fluidizing a mass formed by the polishing body, the workpiece, and the polishing aid and water added as necessary;
Polishing the workpiece;
Including
The step of polishing the workpiece includes a step of contacting the workpiece with the polishing body,
A step of cutting the workpiece with the abrasive particles while the combined body absorbs collision energy when the abrasive body comes into contact with the workpiece;
A step of detaching abrasive particles located on the outer surface of the abrasive;
A barrel polishing method including: A method for producing a polishing body according to any one of claims 1 to 4,
Kneading the abrasive particles weighed so as to have a predetermined ratio and the particles constituting the combined body while adjusting the moisture content to obtain a mixed material;
Forming the mixed material into a predetermined shape to obtain a molded product;
Firing the molded article;
Including
The step of firing the molded article includes a step of bonding particles constituting the bonded body and bonding the abrasive particles through the bonded body.