JP7627474B2 - Barrel polishing equipment - Google Patents

Description

The present invention relates to a barrel polishing machine, and more specifically to a barrel polishing technique that polishes workpieces by agitating a barrel tank filled with workpieces and abrasives, causing the workpieces to rub against the abrasives.

Barrel polishing technology is used in the intermediate and/or final finishing process of various workpieces (hereinafter referred to as workpieces) for purposes such as deburring, smooth finishing, mirror finishing, and rounding. Its basic principle is that abrasives (media) and workpieces are mixed in a specified ratio and filled into a barrel tank, and the barrel tank is given motion, causing the workpieces to rub against the abrasives, thereby polishing the workpieces.

There are several polishing methods for imparting motion to the barrel tank, including rotating barrel, vibrating barrel, centrifugal barrel, and vortex barrel, but the centrifugal barrel method in particular has high processing capacity and is widely used in various manufacturing fields.

In this centrifugal barrel method, a barrel tank rotatably mounted on a rotating table rotates on its own axis while revolving (planetary revolution) as the rotating table rotates, applying centrifugal force to the workpieces and abrasives in the barrel tank, polishing the workpieces by rubbing against each other. The rotational motion of the barrel tank is generally about half the revolution speed, and it rotates in the same direction as or opposite to the revolution direction.

However, even with the centrifugal barrel method, which has such excellent processing capabilities, there are problems such as (i) the occurrence of dents between the workpieces, (ii) the occurrence of deformation and distortion of the workpieces, and (iii) the remaining burrs due to insufficient polishing capacity, and further improvements were required.

In this regard, the applicant has developed and proposed the barrel polishing machine described in Patent Document 1.

This barrel polishing machine is configured such that a rotating support shaft is rotatably supported vertically and parallel to the rotating main shaft on a rotating table that is attached horizontally to a vertical rotating main shaft and driven to rotate at a predetermined revolution speed, and a barrel tank that fills and contains workpieces and abrasives is attached and held on the rotating support shaft with its axis inclined at a predetermined angle to the rotating main shaft, and the rotating support shaft and the rotating table are drivingly connected to a single rotary drive unit by a planetary gear mechanism.

Then, the horizontal rotation of the rotary table by the rotary drive unit causes the barrel tank to perform planetary motion around the main axis of rotation while tilted, so that the abrasive material and the workpieces filled and stored in the barrel tank flow vertically and horizontally (three-dimensional relative motion) as one unit without separating from each other. As a result, the abrasive material and the workpieces rub against each other efficiently, and the workpieces are polished with high polishing ability, eliminating the above-mentioned problems with the centrifugal barrel method.

JP 2008-155286 A

The workpieces to be barrel polished are made of a wide variety of materials, from metallic to non-metallic, and come in a variety of shapes and dimensions. Experiments have shown that the planetary motion in the barrel polishing machine has optimal motion conditions for each of these workpieces, that is, the speed ratio between the rotation speed and revolution speed of the barrel tank described above.

In addition, users who actually perform barrel polishing using the barrel polishing machine described above also wanted to be able to arbitrarily set the optimal motion conditions as desired, taking into consideration the finishing accuracy and finishing speed.

Ideally, therefore, it would be desirable to adjust and set the motion conditions of the planetary motion for each workpiece to be polished or for each user. However, because the planetary motion in the barrel polishing machine is performed by a planetary gear mechanism, adjusting and setting the motion conditions would in reality require the manufacturer to change the design of the planetary gear mechanism, which is not necessarily an easy task and is expensive, making it practically difficult or impossible.

In other words, the planetary gear mechanism in the barrel polishing machine has a structure in which the rotating shaft and the rotating table are connected to a single rotary drive unit by a planetary motion mechanism, and the speed ratio between the rotation speed and revolution speed of the barrel tank that controls the planetary motion is designed uniformly by the manufacturer. In order to change the settings of the motion conditions of this planetary motion, the manufacturer needs to change the gear ratio between the constituent gears in the planetary gear mechanism. However, due to the structure, this work requires removing the planetary gear mechanism itself from the machine and replacing it with a planetary gear mechanism that has the desired gear ratio. Moreover, the necessary information that is the premise for determining the desired gear ratio is mainly obtained from the actual user, and in practice, changing the settings of the motion conditions was difficult or impossible.

The present invention was made in consideration of such conventional problems, and its purpose is to provide a highly versatile barrel polishing machine that uses a centrifugal barrel system with planetary motion, and that can freely set and adjust the motion conditions of the planetary motion, and can flexibly respond to the workpieces to be processed and the needs of the user.

In order to achieve the above object, the first barrel polishing machine of the present invention is a barrel polishing machine in which a barrel tank filled with workpieces and an abrasive revolves in a horizontal direction, thereby applying centrifugal force to the workpieces and the abrasive in the barrel tank, and polishing the workpieces by rubbing against each other between the workpieces and the abrasive, and the machine is provided with a revolving means for revolving the barrel tank in a horizontal direction, a rotating means for rotating the barrel tank in a horizontal direction, and a control means for automatically controlling the revolving means and the rotating means in cooperation with each other, and the revolving means includes a rotary table that is attached horizontally to a vertical rotating main shaft and is driven to rotate at a predetermined revolving speed, and a revolution drive unit which drives the rotation main shaft to rotate, and the rotation means comprises a rotation support shaft which is rotatably supported on the rotary table in a vertical state parallel to the rotation main shaft and is driven to rotate at a predetermined rotation speed, and a rotation drive unit which drives the rotation support shaft to rotate, and the barrel tank is attached to the rotation support shaft in a state inclined with respect to the rotation main shaft, and the revolution drive unit is a revolution drive motor which is directly connected to the rotation main shaft, and the rotation drive unit comprises a rotation drive motor and a belt transmission mechanism which transmits the rotation drive force of the rotation drive motor to the rotation support shaft, and the belt transmission mechanism comprises The apparatus is composed of a first transmission mechanism comprising a drive gear attached to the output shaft of the rotation drive motor, a driven gear supported on the rotation main shaft so as to be freely rotatable, and a toothed belt drivingly connecting these two gears, and a second transmission mechanism comprising a rotation gear attached concentrically and integrally to the rotation support shaft, a main shaft gear supported on the rotation main shaft so as to be freely rotatable, and a toothed belt drivingly connecting these two gears, the driven gear of the first transmission mechanism and the main shaft gear of the second transmission mechanism being coaxially and integrally connected, and the control means independently adjusts and sets the revolution speed and the rotation speed of the barrel tank, thereby The invention is configured to control the revolution drive motor of the revolution means and the rotation drive motor of the rotation means so that the revolution speed and the rotation speed of the barrel tub become an arbitrary speed ratio, whereby the barrel tub revolves horizontally around the axis of the rotation main shaft at a predetermined revolution speed, and rotates or stops around the axis of the rotation support shaft at a slow predetermined rotation speed that is significantly slower than the revolution speed, and the rotation speed is set to -1/20 to 1/20 of the revolution speed, and the speed ratio of the rotation speed to the revolution speed is variably adjustable.

As a preferred embodiment, the following configuration is adopted.
(1) A barrel tank receiver is attached to the rotating support shaft supported on the rotating table with its axis inclined at a predetermined angle with respect to the main rotating shaft, and the barrel tank is coaxially housed and held in the barrel tank receiver so as to be removably inserted from above.

(2) The driven gear and the main shaft gear are composed of a single gear.

(3) A plurality of the rotation support shafts are arranged at equal intervals in the circumferential direction at the outer periphery of the rotating table, and a single main shaft gear is drivingly connected to the rotation gears attached to the plurality of rotation support shafts, thereby forming a main shaft gear shared structure.

(4) A speed setting means is provided for setting the revolution speed and rotation speed of the barrel tank.

(5) A speed ratio setting means is provided for setting the speed ratio between the revolution speed and the rotation speed of the barrel tank 1.

(7) The revolution speed of the barrel tank is set to 100 to 300 revolutions per minute.

(8) The inclination angle of the axis of the barrel tank is set to 10 degrees to 30 degrees.

A second barrel polishing machine of the present invention is a barrel polishing machine in which a barrel tank filled with workpieces and an abrasive revolves in a horizontal direction, thereby applying centrifugal force to the workpieces and the abrasive in the barrel tank, and polishing the workpieces by rubbing against each other between the workpieces and the abrasive. The barrel polishing machine comprises a revolving means for revolving the barrel tank in a horizontal direction, a rotating means for rotating the barrel tank in a horizontal direction, and a control means for automatically controlling the revolving means and the rotating means in cooperation with each other. The revolving means comprises a rotary table that is attached horizontally to a vertical main rotation shaft and is rotated at a predetermined revolution speed, and a rotary table that is rotated by the rotary table. The rotation means includes a rotation support shaft that is rotatably supported on the rotary table in a vertical state parallel to the rotation main shaft and is driven to rotate at a predetermined rotation speed, and a rotation drive unit that drives the rotation support shaft, and the barrel tank is attached to the rotation support shaft in a state inclined with respect to the rotation main shaft, and the revolution drive unit is a revolution drive motor that is directly connected to the rotation main shaft, and the rotation drive unit includes a rotation drive motor and a gear mechanism that transmits the rotation drive force of the rotation drive motor to the rotation support shaft, and the gear mechanism is a rotation drive motor. The present invention is configured with a first transmission mechanism comprising a drive gear attached to the output shaft of a motor, a driven gear supported on the main shaft so as to be freely rotatable, and a toothed belt drivingly connecting these two gears, and a second transmission mechanism comprising a rotation gear attached concentrically and integrally to the main shaft, a main shaft gear supported on the main shaft so as to be freely rotatable, and an intermediate gear drivingly connecting these two gears, the driven gear of the first transmission mechanism and the main shaft gear of the second transmission mechanism being coaxially and integrally connected, and the control means independently adjusts and sets the revolution speed and the rotation speed of the barrel tank, thereby controlling the rotation of the barrel tank. a revolving drive motor of the revolving means and a rotation drive motor of the rotation means so that the revolving speed and the rotation speed of the barrel tank are set to an arbitrary speed ratio, whereby the barrel tank is horizontally revolved around the axis of the rotating main shaft at a predetermined revolving speed, and rotates or stops around the axis of the rotating support shaft at a slow predetermined rotation speed that is significantly slower than the revolving speed, and the rotation speed is set to -1/20 to 1/20 of the revolving speed, and the speed ratio of the rotation speed to the revolving speed is variably adjustable.

As a preferred embodiment, the following configuration is adopted.
(1) The driven gear and the main shaft gear are composed of a single gear.

(2) A plurality of the rotation support shafts are arranged at equal intervals in the circumferential direction at the outer periphery of the rotating table, and a single main shaft gear is drivingly connected to the rotation gears attached to the plurality of rotation support shafts, thereby forming a main shaft gear shared structure.

(3) A speed setting means is provided for setting the revolution speed and rotation speed of the barrel tank.

(4) A speed ratio setting means is provided for setting the speed ratio between the revolution speed and the rotation speed of the barrel tank.

(6) The revolution speed of the barrel tank is set to 100 to 300 revolutions per minute.

(7) The inclination angle of the axis of the barrel tank is set to 10 degrees to 30 degrees.

According to the barrel polishing apparatus of the present invention, there is provided a revolving means for revolving the barrel tank in a horizontal direction, a rotation means for rotating the barrel tank in a horizontal direction on its axis, and a control means for automatically controlling the revolving means and the rotation means in cooperation with each other, the revolving means includes a rotary table that is attached horizontally to a vertical rotary main shaft and is driven to rotate at a predetermined revolving speed, and a revolution drive unit that drives the rotary main shaft, the rotation means includes a rotary support shaft that is rotatably supported on the rotary table in a vertical state parallel to the rotary main shaft and is driven to rotate at a predetermined rotation speed, and a rotation drive unit that drives the rotary support shaft, the barrel tank is attached to the rotary support shaft in a state inclined with respect to the rotary main shaft, the revolving drive unit is a revolving drive motor directly connected to the rotary main shaft, and the rotation drive unit transmits the rotational drive force of the rotation drive motor to the rotary support shaft. The control means is configured to control the revolution drive motor of the revolution means and the rotation drive motor of the rotation means so that the revolution speed and the rotation speed of the barrel tub become an arbitrary speed ratio by independently adjusting and setting the revolution speed and the rotation speed of the barrel tub. As a result, the barrel tub revolves horizontally around the axis of the rotating main shaft at a predetermined revolution speed, and rotates or stops around the axis of the rotating support shaft at a predetermined slow rotation speed that is significantly slower than the revolution speed, and the speed ratio of the rotation speed to the revolution speed is variably adjustable. Since the motion conditions of the planetary motion can be arbitrarily set and adjusted in a centrifugal barrel type barrel polishing apparatus that performs planetary motion, it is possible to provide a highly versatile barrel polishing apparatus that can flexibly respond to the workpieces to be processed and the requests of users.

In other words, in a centrifugal barrel type barrel polishing machine that performs planetary motion, the barrel tank revolves horizontally around the main shaft at a predetermined speed, and at a slow predetermined rotation speed that is significantly slower than the revolution speed, it oscillates and rotates in an inclined state relative to the main shaft. This allows for "three-dimensional relative motion between the workpiece and the polishing material" that was not possible with the general centrifugal barrel type, and significantly reduces or eliminates the three problems (i) to (iii) mentioned above in the centrifugal barrel type polishing process. In addition, in the present invention, the speed ratio of the rotation speed of the barrel tank to the revolution speed can be variably adjusted, so that the optimal planetary motion conditions can be set for each workpiece to be barrel polished, depending on its material and shape and dimensions, and the user who actually performs the barrel polishing can also arbitrarily set the optimal planetary motion conditions desired by the user by comparing and considering the finishing accuracy and finishing speed.

1 is a side view showing a barrel polishing apparatus according to a first embodiment of the present invention. FIG. FIG. 2 is a partially cutaway front view showing the internal structure of the barrel polishing apparatus. FIG. 3 is a plan sectional view taken along line III-III in FIG. 2 showing the barrel polishing apparatus. FIG. 4 is a plan sectional view taken along line IV-IV in FIG. 2 showing the barrel polishing apparatus. FIG. 2 is an enlarged front view showing a main component part of the barrel polishing apparatus. FIG. 2 is a block diagram showing a control configuration of the barrel polishing apparatus. 3 is a schematic diagram showing the behavior of the abrasive and the workpiece in the barrel tank during operation of the barrel polishing apparatus. FIG. FIG. 6 is a partially cutaway front view showing an internal structure of a barrel polishing apparatus according to a second embodiment of the present invention. FIG. 9 is a plan sectional view taken along line IX-IX in FIG. 8 showing the barrel polishing apparatus. FIG. 2 is an enlarged front view showing a main component part of the barrel polishing apparatus.

Embodiments of the present invention will now be described in detail with reference to the drawings. Note that the same reference numerals throughout the drawings denote the same components or elements.

EMBODIMENT 1
A barrel polishing apparatus according to the present invention is shown in FIGS. 1 to 7. As shown typically in FIG. 7, this barrel polishing apparatus is of a centrifugal barrel type having a configuration in which a barrel tank 1 filled with a large number of workpieces W, W, ... and abrasives (media) G, G, ... revolves in the horizontal direction, thereby applying centrifugal force to the workpieces W, W, ... and the abrasives G, G, ... in the barrel tank 1, and the workpieces W, W, ... are polished by rubbing against each other.

Specifically, in the barrel polishing machine of this embodiment, the barrel tank 1 is installed with its axis X inclined relative to the vertical revolution axis, i.e., the axis X0 of the rotating main shaft 10, and the barrel tank 1 revolves horizontally around the revolution axis X0 at a predetermined revolution speed, and rotates or stops around the vertical axis, i.e., the axis X1 of the rotating support shaft 15 at a slow predetermined rotation speed that is significantly slower than the revolution speed.

The barrel polishing machine is mainly composed of the barrel tank 1, the revolving means 2, the rotating means 3, and the control unit 4 as a control means for controlling the revolving means 2 and the rotating means 3, and these components 1 to 4 are installed inside the machine case 5.

The device case 5 is a roughly rectangular parallelepiped with an openable lid 5a at the top, and the bottom is provided with casters 6 for moving the device case 5, as well as a level adjuster 7 for adjusting the position of the device case 5 to a horizontal position when the device case 5 is in a fixed installation state.

The barrel tank 1 is a sealable cylindrical container that is used to fill and store the workpieces W, W, ... to be polished together with the polishing materials (media) G, G, .... The barrel tank 1 in the illustrated embodiment is a urethane container, and although not specifically shown, it is a cylindrical container with a polygonal prism-shaped profile whose inner periphery has a polygonal cross-sectional shape, specifically, a cylindrical container with an octagonal prism-shaped inner periphery.

The barrel tanks 1 are removably mounted in a number of units at equal intervals in the circumferential direction on the rotating table 8 of the revolving means 2 described later. In the illustrated embodiment, four barrel tanks 1, 1, ... are removably mounted at equal intervals in the circumferential direction at the outer periphery of the rotating table 8.

The revolving means 2 revolves the barrel tank 1 in the horizontal direction, and specifically, is composed of the above-mentioned rotating table 8 and the revolving drive unit 9 as its main parts, and a revolving drive motor is used as the above-mentioned revolving drive unit 9.
is.

The rotating table 8 is disk-shaped and is attached horizontally to a vertical main rotating shaft 10, which is directly connected to the revolution drive motor 9.

In the illustrated embodiment, a headstock 12 is provided at the center of the base frame 11 of the device case 5, and the rotating spindle 10 is supported vertically and rotatably on the headstock 12 via a bearing (not shown), and the rotating table 8 is attached horizontally to the upper end of the rotating spindle 10 by a fixing bracket 14.

The revolution drive motor 9 is mounted horizontally on the spindle base 12, on which the lower part of the rotating spindle 10 is supported, and although not specifically shown, the lower part of the rotating spindle 10 is directly gear-driven to the output shaft of the revolution drive motor 9. A geared motor with a built-in reduction gear mechanism is used as the revolution drive motor 9, and this revolution drive motor 9 is electrically connected to the control unit 4 via the motor drive unit 40 (Figure 6).

Then, by the rotation drive of the revolution drive motor 9, the rotary table 8 is rotated together with the rotary main shaft 10 in the horizontal direction (the direction of the arrow A) at a predetermined rotation speed, so that the barrel tanks 1, 1, ... on the rotary table 8 revolve horizontally around the axis of the rotary main shaft 10, i.e., the revolution axis X0, at a predetermined speed.

Four rotating shafts 15, 15, ... are arranged at equal intervals around the periphery of the rotating table 8, corresponding to the number of barrel tanks 1. Each rotating shaft 15 is supported by a bearing (not shown) in a vertical position, i.e., in a position parallel to the main rotating shaft 10, so that it can rotate. A barrel tank holder 16 that removably houses and supports the barrel tank 1 is attached and fixed at an angle to the upper end 15a of each rotating shaft 15.

Specifically, the barrel tank receiver 16 has its bottom fixed to the upper end 15a of the rotating shaft 15 and its top open so that it can receive and hold the barrel tank 1 from above.

The barrel tank holder 16 is attached to the rotating support shaft 15 with its axis X inclined at a predetermined angle α with respect to the axis X1 of the rotating support shaft 15, i.e., the axis (revolution axis) X0 of the rotating main shaft 10. When the barrel tank 1 is housed in the barrel tank holder 16, the barrel tank 1 is also set so that its axis coincides with the axis X of the barrel tank holder 16, i.e., so that they are coaxial, and is inclined at a predetermined angle α with respect to the axis of the rotating main shaft 10, i.e., the revolution axis X0. 17 denotes a clamp for fixing the barrel tank 1 to the barrel tank holder 16.

The inclination angle of the axis X of the barrel tank 1, i.e., the inclination angle α with respect to the vertical revolution axis X0, is specifically set to 10 degrees to 30 degrees, preferably 12 degrees to 20 degrees, and in the illustrated embodiment, the inclination angle α is set to 15 degrees.

The inclination angle α is set in this manner because, if the inclination angle α is less than 10 degrees or greater than 30 degrees, the cooperation between the inner inclined surface of the barrel tank 1 and the centrifugal force generated by the revolution of the barrel tank 1, which will be described later, cannot be reliably obtained, and, moreover, if the inclination angle α is greater than 30 degrees, there is a structural problem with the wet barrel polishing apparatus in that the contents W, G, ... stored in the barrel tank 1 will spill out when the barrel tank 1 is attached to the barrel tank receiver 16.

The rotation means 3 rotates the barrel tank 1 horizontally, and is configured to rotate the barrel tank 1 at a slow rotation speed that is significantly slower than the rotation speed of the turntable 8, i.e., the revolution speed of the barrel tank 1.

The rotation means 3 and the revolution means 2 have a drive train that is independent of each other, so that the rotation speed of the barrel tank 1 can be freely adjusted to any speed independently of the revolution speed.

The specific configuration of the rotation means 3 includes the rotation support shaft 15 that is rotatably supported on the rotating table 8 and driven to rotate at a predetermined rotation speed, and a rotation drive unit 20 that drives the rotation support shaft 15 to rotate.

As described above, the rotating support shaft 15 is supported on the rotating table 8 in a rotatable manner in a vertical state parallel to the rotating main shaft 10, and the barrel tank receiver 16 is attached and fixed to its upper end 15a in an inclined state with a predetermined inclination angle α.

The rotation drive unit 20 drives the rotation support shaft 15 to rotate, and specifically, it is composed of a rotation drive motor 21 and a belt transmission mechanism 22 that transmits the rotational driving force of the rotation drive motor 21 to the rotation support shaft 15.

A geared motor with a built-in reduction gear mechanism is used as the rotation drive motor 21, which is horizontally mounted on the base frame 11, and the output shaft 21a of this rotation drive motor 21 is drivingly connected to the belt transmission mechanism 22. This rotation drive motor 21 is electrically connected to the control unit 4 via the motor drive unit 41 (Figure 6).

The belt transmission mechanism 22 is composed of a first transmission mechanism 23 consisting of a drive gear (timing pulley) 23a attached to the output shaft 21a of the rotation drive motor 21, a driven gear (timing pulley) 23b axially supported by the rotating main shaft 10 so as to be freely rotatable, and a toothed belt (timing belt) 23c that drives and connects these two gears 23a and 23b, and a second transmission mechanism 24 consisting of a rotation gear (timing pulley) 24a attached concentrically and integrally to the rotating support shaft 15, a main shaft gear (timing pulley) 24b axially supported by the rotating main shaft 10 so as to be freely rotatable, and a toothed belt (timing belt) 24c that drives and connects these two gears 24a and 24b, and the driven gear 23b and the main shaft gear 24b are connected coaxially and integrally.

In addition, in the first transmission mechanism 23, if structurally possible, such as in terms of placement space, the drive gear 23a and the driven gear 23b can be directly connected and driven, omitting the toothed belt 23c.

In addition, in the illustrated embodiment, four of the rotating shafts 15 are provided at equal intervals in the circumferential direction at the outer periphery of the rotating table 8 in accordance with the number of barrel tanks 1 arranged, i.e., four barrel tanks 1, 1, ..., and a second transmission mechanism 24 is provided for each pair of adjacent two rotating shafts 15, 15, resulting in a total of two pairs of second transmission mechanisms 24, 24.

Specifically, as shown in FIG. 4, each toothed belt 24c of the two second transmission mechanisms 24, 24 is wound around a rotation gear 24a, 24a attached to two adjacent rotation support shafts 15, 15, respectively, and a main shaft gear 24b supported on the main shaft 10 so as to be freely rotatable, and a tension pulley 24d is provided to maintain the tension of the toothed belt 24c at a predetermined value.

By adopting two sets of second transmission mechanisms 24, 24 in this way, two main shaft gears 24b, 24b are provided on one rotating main shaft 10. In order to prevent the two main shaft gears 24b, 24b and further the second transmission mechanisms 24, 24 from interfering with each other, as shown in Figures 2 and 5, the two main shaft gears 24b, 24b are supported on the rotating main shaft 10 with an axial shift, and the two second transmission mechanisms 24, 24 are arranged in two layers, one above the other.

In the illustrated embodiment, a single main shaft gear 24e is used as the main shaft gears 24b, 24b in the two sets of second transmission mechanisms 24, 24, and this main shaft gear 24e is drivingly connected to the rotation gears 24a, 24a of the adjacent rotation support shafts 15, 15 by toothed belts 24c, 24c, respectively, as shown in Figures 2, 4, and 5.

Furthermore, the driven gear 23b of the first transmission mechanism 23 and the main shaft gear 24e (24b, 24b) of the second transmission mechanism 24 are integrally formed as a single component and are composed of a single gear, simplifying the assembly structure.

Then, the rotation drive motor 21 rotates the four barrel tanks 1, 1, ... arranged and supported on the rotating table 8 via the belt transmission mechanism 22 (first transmission mechanism 23, second transmission mechanism 24) at a predetermined rotation speed.

In this case, the rotation speed of the barrel tanks 1, 1, ... is set to a slow speed that is significantly slower than the revolution speed about the revolution axis X0, and the speed ratio of this rotation speed to the above-mentioned revolution speed is variably adjustable by freely adjusting and setting the rotation speed of the barrel tank 1 to any speed independently of the above-mentioned revolution speed, since the rotation means 3 and the revolution means 2 are in a mutually independent drive train, as described above.

That is, the rotational speed (number of revolutions) of the revolution drive motor 9 of the revolution means 2 and the rotation drive motor 21 of the rotation means 3 are controlled and set independently, thereby setting optimal operating conditions in a centrifugal barrel type barrel polishing machine that performs planetary motion. In this embodiment, the basic operation is to arbitrarily control and set the rotational speed of the rotation drive motor 21 relative to the basic rotational speed of the revolution drive motor 9 of the basic drive system, thereby setting optimal operating conditions for planetary motion.

The optimal operating conditions include (i) the optimum planetary motion conditions for each workpiece W to be barrel polished, which is made of a wide variety of materials ranging from metallic to non-metallic materials and also has a wide variety of shapes and dimensions, and (ii) the optimum planetary motion conditions desired by the user who actually performs the barrel polishing, taking into consideration the finishing accuracy and finishing speed of the workpiece W, and the planetary motion conditions can be freely and arbitrarily set for each workpiece W to be polished or for each user.

When setting the actual motion conditions in this case, the manufacturer of the barrel polishing machine has set the planetary motion motion conditions (basic setting conditions) as a result of various repeated test and research conducted in advance, and the user, for example, actually performs barrel polishing on each workpiece W to be barrel polished, and compares and determines the finishing accuracy and finishing speed of the target workpiece W that the user desires.

In the barrel polishing machine of this embodiment, the rotation speeds of the revolving drive motor 9 of the revolving means 2 and the rotation drive motor 21 of the rotating means 3 are controlled by the control unit 4.

The control unit 4 automatically controls the revolving means 2 and the rotating means 3 in cooperation with each other, and is specifically composed of a microcomputer including a CPU, ROM, RAM, and I/O ports.

This control unit 4 incorporates basic processing programs for executing barrel polishing processing, and as shown in Figure 6, the control unit 4 is connected to a motor drive unit 40 that drives and controls the revolution drive motor 9 of the revolution means 2, and a motor drive unit 41 that drives and controls the rotation drive motor 21 of the rotation means 3.

In the control unit 4, various information necessary for driving the revolution drive motor 9 of the revolution means 2 and the rotation drive motor 21 of the rotation means 3, such as the rotation speed of the turntable 8 (revolution speed of the barrel tank 1), the rotation speed of the barrel tank 1, the operation time, the timing of speed changes, or the processing time of the polishing process, is input as basic control data in advance or appropriately selectively set by the operation unit of the operation panel 50 (see Figures 1 and 2) provided in the device case 5, and the revolution drive motor 9 and the rotation drive motor 21 are controlled according to this data.

As described above, the control unit 4 is configured to adjust and set the rotation speed of the barrel tank 1 independently of the revolution speed, thereby variably adjusting the speed ratio of the rotation speed of the barrel tank 1 to the revolution speed to an arbitrary set value, which is a characteristic configuration of the barrel polishing apparatus of this embodiment, and control the revolution drive motor 9 of the revolution means 2 and the rotation drive motor 21 of the rotation means 3.

For this purpose, the control unit 4 is connected to a setting unit 45 that sets various operating conditions and a display unit 46 that displays various information, and the setting unit 45 includes a speed setting unit 47 as a speed setting means for setting the revolution speed and rotation speed of the barrel tank 1, and a speed ratio setting unit 48 as a speed ratio setting means for setting the speed ratio between the revolution speed and rotation speed of the barrel tank 1.

The operation panel 50, which is not specifically shown in the figure, is equipped with a start and stop switch, and is in the form of a touch panel display device that combines the functions of both the setting unit 45 and the display unit 46. This touch panel display device 50 is configured so that the display unit 51, which is made of a liquid crystal screen, switches between displaying the setting unit 45 and the display unit 46 by touch operation with a finger.

The speed setting unit 47 is used to set the revolution speed and rotation speed of the barrel tank 1. Specifically, the rotation speed of the revolution drive motor 9 of the revolution means 2 and the rotation speed of the rotation drive motor 21 of the rotation means 3 can be controlled and set individually, so that the revolution speed and rotation speed of the barrel tank 1 can be set to any value. Furthermore, by freely setting a combination of the revolution speed and the rotation speed, the speed ratio of the rotation speed of the barrel tank 1 to the revolution speed can be steplessly variably adjusted to any set value.

In the illustrated embodiment, the basic setting operation is to first set the basic rotation speed of the revolution drive motor 9 of the basic drive system, and then set the rotation speed of the rotation drive motor 21 to an arbitrary value to set the optimal operating conditions for the above planetary motion, but it is of course possible to set both drive motors 9 and 21 independently and arbitrarily.

In this embodiment, it is preferable that the revolution speed of the barrel tank 1 is set to 100 to 300 revolutions per minute, and the rotation speed is set to -1/20 to 1/20 of the revolution speed.

The revolution speed and rotation speed of these barrel tanks 1 were set as a result of various repeated test and research studies, and by setting the revolution speed within this range, the planetary motion conditions suitable for each workpiece W to be barrel polished can be obtained.

Specifically, the workpieces W to be subjected to barrel polishing are made of a wide variety of materials, ranging from metallic to non-metallic materials, and also come in a variety of shapes and dimensions. The abrasives G, G, ... that are charged into the barrel tank 1 together with the workpieces W, W, ... are often ceramic-based, but there are a great many types depending on the shape and size. It has been found that by setting the revolution speed of the barrel tank 1 to 100 to 300 revolutions per minute, it is possible to obtain planetary motion conditions suitable for each individual workpiece W to be polished.

In other words, the revolution speed of the barrel tank 1 is set to 100 to 300 revolutions per minute, taking into consideration the effective use of centrifugal force, and it has been found that by setting the revolution speed within this range, centrifugal force is effectively applied to the contents W, G, etc. filled in the barrel tank 1.

In this case, the rotation speed of the barrel tank 1 is set to -1/20 to 1/20 of the revolution speed, i.e., 5 to 15 revolutions per minute, and is set within this range for the following reasons.

In other words, if the rotation speed of the barrel tank 1 is greater than 1/20 of the revolution speed, the effect of the centrifugal force acting on the abrasives G, G, ... and workpieces W, W, ... due to the revolution of the barrel tank 1 is reduced or offset by the effect of the centrifugal force acting on these abrasives G, G, ... and workpieces W, W, ... due to the rotation of the barrel tank 1, and is not fully exerted, and active movement of the abrasives G, G, ... and workpieces W, W, ... within the barrel tank 1 is not obtained.

In contrast, if the rotation speed of the barrel tank 1 is between 0 and 1/20 of the revolution speed, the centrifugal force generated in the abrasives G, G, ... and the workpieces W, W, ... by the revolution of the barrel tank 1 is fully effective, and the movement of the abrasives G, G, ... and the workpieces W, W, ... is not limited to simple horizontal movement, but also induces vertical movement due to the cooperative action with the inclined inner surface due to the inclination angle α of the barrel tank 1 (three-dimensional relative movement).

It has also been found that, compared to when the barrel tank 1 only revolves and does not rotate (i.e., when the rotation speed is zero), when the barrel tank 1 rotates at a very slow rotation speed of less than 1/20 of the revolution speed as described above, the centrifugal force caused by the revolution of the barrel tank 1 acts effectively on the abrasives G, G, ... and workpieces W, W, ... present in the corners of the barrel tank 1, allowing all of the abrasives G, G, ... and workpieces W, W, ... within the barrel tank 1 to perform smooth three-dimensional relative movement.

The speed ratio setting unit 48 is for setting the speed ratio between the revolution speed and the rotation speed of the barrel tank 1. The speed setting unit 47 controls and sets the revolution speed and the rotation speed of the barrel tank 1 individually, thereby indirectly adjusting the speed ratio of the rotation speed of the barrel tank 1 to the revolution speed, whereas the speed ratio setting unit 48 can directly adjust and set the speed ratio of the rotation speed of the barrel tank 1 to the revolution speed.

In this embodiment, as a result of various repeated test and research studies, multiple speed ratios between the revolution speed and the rotation speed of the barrel tank 1 are preset in the range of -1/20 to 1/20, and the user can select and set any speed ratio from these multiple preset speed ratios. In addition, the speed setting unit 47 or the speed ratio setting unit 48 can be used to set the speed ratio between the revolution speed and the rotation speed of the barrel tank 1 arbitrarily and steplessly.

With the control unit 4 configured as described above, when the display unit 51 of the touch panel display device 50 displays the screen of the setting unit 45 on a liquid crystal display, the user can touch the operation panel of this setting unit 45 with his or her fingers to input and set any control data from the speed setting unit 47 or speed ratio setting unit 48. On the other hand, when the screen of the display unit 46 is displayed on a liquid crystal display, the operating conditions of the device (necessary information such as the rotation speed of the turntable 8 (revolution speed of the barrel tank 1), the rotation speed of the barrel tank 1, the operating time of the device, or the elapsed operating time) are displayed on a liquid crystal display.

The control unit 4 also incorporates processing programs for executing multiple barrel polishing processes, taking into account various processing conditions, and these processing programs are selected by touching and specifying the desired program number on the operation panel of the setting unit 45 of the touch panel display device 50.

In the barrel polishing machine configured as described above, when the barrel tanks 1 filled with a large number of workpieces W, W, ... and abrasives G, G, ... are held in the barrel tank receivers 16, 16, ... rotatably mounted on the rotating table 8, the start switch is operated to start the control unit 4 to automatically control the revolution drive motor 9 of the revolution means 2 and the rotation drive motor 21 of the rotation means 3 in cooperation with each other, so that the barrel tanks 1, 1 revolve horizontally around the revolution axis X0 at a predetermined revolution speed, and rotate or stop around the vertical axis X1 at a slow predetermined rotation speed that is significantly slower than this revolution speed, while the workpieces W, W, ... in the barrel tank 1 are polished by rubbing against the abrasives G, G, ....

In other words, the control unit 4 drives the revolution drive motor 9 of the revolution means 2 to rotate the rotary table 8 horizontally (in the direction of arrow A), and the rotation drive motor 21 of the rotation means 3 is linked to this, so that the barrel tank 1 revolves horizontally around the revolution axis X0 of the vertical rotation main shaft 10 at the above revolution speed, and 1 rotates or stops horizontally around the axis X1 of the vertical rotation support shaft 15, applying centrifugal force to the workpieces W, W, ... and the abrasives G, G, ... in the barrel tank 1, and the workpieces W, W, ... are polished by the friction between the workpieces W, W, ... and the abrasives G, G, ....

In this case, the barrel tanks 1, 1, ... are attached to the rotating support shaft 15 with their axes X inclined relative to the revolution axis X0 of the rotating main shaft 10, i.e., the axis X1 of the rotating support shaft 15, and rotate or stop at a rotation speed that is much slower than the revolution speed.

As a result, the behavior of the workpieces W, W, ... and the abrasives G, G, ... packed and stored in each barrel tank 1, especially the behavior of the abrasives G, G, ..., is such that they bounce randomly off the inclined inner surface of the barrel tank 1 and move three-dimensionally, as shown in Figure 7 (a), and the abrasives G, G, ... flow toward the center as if they are being kneaded deeper and deeper in, as shown by the arrows.

In other words, the barrel tank 1 slowly revolves while oscillating as shown in Figure 7(b) → Figure 7(c) → Figure 7(b), so that the abrasives G, G, ... and the workpieces W, W, ... move randomly and three-dimensionally inside the barrel tank 1, and are kneaded into the center of the barrel tank 1, so that the workpieces W, W, ... are always present among the abrasives G, G, ....

This behavior is thought to occur because the centrifugal force generated by the revolution of the barrel tank 1 does not simply cause horizontal movement of the abrasives G, G, ... and the workpieces W, W, ..., but also induces vertical movement due to the cooperative action with the inclined inner surface caused by the inclination of the barrel tank 1, and as a result, the difference in the weight of the abrasives G, G, ... and the workpieces W, W, ... also works effectively, causing them to flow vertically and horizontally within the barrel tank 1 without separating (three-dimensional relative motion).

In this case, the speed ratio of the rotation speed of the barrel tank 1 to the above-mentioned revolution speed is variably adjustable by freely adjusting and setting the rotation speed of the barrel tank 1 to any speed independently of the revolution speed, and the user sets the motion conditions of the planetary motion of the barrel tank 1 to optimal values by taking into consideration the constituent material and shape dimensions of the workpiece W to be barrel polished, or the finishing accuracy and finishing speed of the workpiece W.

Specifically, (a) the speed ratio of the rotation speed to the revolution speed of the barrel tank 1 is indirectly adjusted by individually controlling and setting the revolution speed and rotation speed of the barrel tank 1 from the speed setting unit 47 of the setting unit 45, or (b) the speed ratio of the revolution speed and rotation speed of the barrel tank 1 is directly set from the speed ratio setting unit 48 of the setting unit 45.

As described above, according to the barrel polishing machine of this embodiment, the barrel tank 1 is installed with its axis X inclined relative to the vertical revolution axis X0 (=X1), and the barrel tank 1 revolves horizontally around the revolution axis X0 at a predetermined speed, and rotates or stops around the vertical axis X1 at a slow predetermined rotation speed that is significantly slower than the revolution speed. Since the speed ratio of the rotation speed to the revolution speed can be variably adjusted, in a centrifugal barrel type barrel polishing machine that performs planetary motion, the motion conditions of the planetary motion can be arbitrarily set and adjusted, and a highly versatile barrel polishing machine that can be used to meet the workpiece W to be processed and the needs of the user can be provided.

That is, in a centrifugal barrel type barrel polishing machine that performs planetary motion, the barrel tank 1 revolves horizontally around the rotating main shaft 10 at a predetermined speed, and at a predetermined slow rotation speed that is significantly slower than the revolution speed, it oscillates and rotates in an inclined state relative to the rotating main shaft 10. This realizes a "three-dimensional relative motion of the workpiece W and the polishing material G" that could not be achieved with a general centrifugal barrel type, and significantly reduces or eliminates the three conventional problems (i) to (iii) in the polishing process using the centrifugal barrel type. In addition, in this embodiment, the speed ratio of the rotation speed of the barrel tank to the revolution speed is variably adjustable, so that the optimal planetary motion conditions can be set for each workpiece W to be barrel polished, depending on its material and shape and dimensions, and the user who actually performs the barrel polishing can also arbitrarily set the optimal planetary motion conditions desired by the user by comparing and considering the finishing accuracy and finishing speed.

EMBODIMENT 2
This embodiment is shown in FIGS. 8 to 10, and the configuration of the rotation drive unit 20 in the first embodiment is modified.

That is, in the barrel polishing machine of this embodiment, the rotation drive unit 20 specifically comprises a rotation drive motor 21 and a gear transmission mechanism 25 that transmits the rotational drive force of the rotation drive motor 21 to the rotation support shaft 15.

The gear mechanism 25 is composed of a first transmission mechanism 23 consisting of a drive gear 23a attached to the output shaft 21a of the rotation drive motor 21, a driven gear 23b supported on the main shaft 10 so as to be freely rotatable, and a toothed belt 23c that drives and connects these two gears 23a and 23b, and a second transmission mechanism 26 consisting of a rotation gear 26a attached concentrically and integrally to the rotation support shaft 15, a main shaft gear 26b supported on the main shaft 10 so as to be freely rotatable, and an intermediate gear 26c that drives and connects these two gears 26a and 26b, and the driven gear 23b and the main shaft gear 26b are connected coaxially and integrally.

The intermediate gear 26c is interposed between the main shaft gear 26b and the rotation gear 26a in a meshed state. Specifically, as shown in Figures 8 and 10, it is rotatably supported via a bearing (not shown) on a support shaft 27 that is supported and fixed to the rotating table 8 below the rotating table 8, and is meshed with the main shaft gear 26b and the rotation gear 26a, respectively.

As in the first embodiment, in the first transmission mechanism 23, if structurally possible, such as in terms of placement space, the drive gear 23a and the driven gear 23b can be directly connected and driven, omitting the toothed belt 23c.

In the illustrated embodiment, as shown in FIG. 9, four of the rotation support shafts 15 are arranged at equal intervals in the circumferential direction on the outer periphery of the rotating table 8 in accordance with the number of barrel tanks 1 arranged, i.e., four barrel tanks 1, 1, ..., and a single main shaft gear 26b is drivingly connected to the rotation gears 26a, 26a, ... attached to these four rotation support shafts 15, 15, ..., forming a main shaft gear shared structure. Specifically, the main shaft gear 26b is drivingly connected to the four rotation gears 26a, 26a, ... via intermediate gears 26c, 26c, ..., respectively.

Furthermore, the driven gear 23b of the first transmission mechanism 23 and the main shaft gear 26b of the second transmission mechanism 26 may be formed as a single component integrally and composed of a single gear, which can simplify the assembly structure.

Then, by the rotation drive of the rotation drive motor 21, the four barrel tanks 1, 1, ... arranged and supported on the turntable 8 are rotated at a predetermined rotation speed via the gear transmission mechanism 25 (the first transmission mechanism 23, the second transmission mechanism 26).
The other configurations and operations are the same as those of the first embodiment.

Note that the above-mentioned embodiments 1 and 2 merely show preferred implementations of the present invention, and the present invention is not limited to these, and various design modifications are possible within the scope of the invention.

For example, in the above-mentioned embodiments 1 and 2, four barrel tanks 1, 1, ... are arranged at equal intervals in the circumferential direction on the rotating table 8, but the number of barrel tanks 1, 1, ... can be increased or decreased as appropriate depending on the purpose.

W Work G Abrasive (media)
X0: revolution axis X; axis line α of barrel vessel receiver (barrel vessel); inclination angle of barrel vessel receiver (barrel vessel) 1: barrel vessel 2: revolution means 3: rotation means 4: control unit 8: rotary table 9: revolution drive motor (revolution drive unit)
10 Rotating main shaft 15 Rotating support shaft 16 Barrel tub receiver 20 Rotation drive unit 21 Rotation drive motor 21a Rotation drive motor output shaft 22 Belt transmission mechanism 23 First transmission mechanism 23a Drive gear 23b Driven gear 23c Toothed belt 24 Second transmission mechanism 24a Rotation gear 24b Main shaft gear 24c Toothed belt 24d Tension pulley 24e Main shaft gear 25 Gear transmission mechanism 26 Second transmission mechanism 26a Rotation gear 26b Main shaft gear 26c Intermediate gear 45 Setting unit 46 Display unit 47 Speed setting unit 48 Speed ratio setting unit 50 Operation panel 51 Display unit

Claims (11)

A barrel polishing apparatus in which a barrel tank filled with workpieces and abrasives revolves in a horizontal direction, thereby applying centrifugal force to the workpieces and the abrasives in the barrel tank, and polishing the workpieces by rubbing against each other,
The apparatus comprises a revolving means for revolving the barrel tank in a horizontal direction, a rotation means for rotating the barrel tank about its axis in the horizontal direction, and a control means for automatically controlling the revolving means and the rotation means in cooperation with each other,
the revolution means includes a rotary table that is attached horizontally to a vertical main rotation shaft and is rotationally driven at a predetermined revolution speed, and a revolution drive unit that rotationally drives the main rotation shaft;
The rotating means includes a rotation support shaft that is rotatably supported on the rotary table in a vertical state parallel to the main rotation shaft and is driven to rotate at a predetermined rotation speed, and a rotation drive unit that drives the rotation support shaft, and the barrel tank is attached to the rotation support shaft in a state inclined with respect to the main rotation shaft,
the revolution drive unit is a revolution drive motor directly connected to the main rotation shaft,
the rotation drive unit includes a rotation drive motor and a belt transmission mechanism that transmits the rotational drive force of the rotation drive motor to the rotation support shaft;
the belt transmission mechanism is composed of a first transmission mechanism consisting of a drive gear attached to the output shaft of the rotation drive motor, a driven gear supported on the main rotation shaft so as to be freely rotatable, and a toothed belt which drive-connects these two gears, and a second transmission mechanism consisting of a rotation gear attached concentrically and integrally to the main rotation shaft, a main shaft gear supported on the main rotation shaft so as to be freely rotatable, and a toothed belt which drive-connects these two gears,
the driven gear of the first transmission mechanism and the main shaft gear of the second transmission mechanism are coaxially and integrally coupled to each other,
the control means is configured to control the revolution drive motor of the revolution means and the rotation drive motor of the rotation means so that the revolution speed and the rotation speed of the barrel tanks are set to an arbitrary speed ratio by independently adjusting and setting the revolution speed and the rotation speed of the barrel tanks,
As a result, the barrel tank is horizontally revolved around the axis of the main rotating shaft at a predetermined revolution speed, and rotates around the axis of the support rotating shaft at a slow predetermined rotation speed that is significantly slower than the revolution speed, or stops.
A barrel polishing machine, characterized in that the rotation speed is set to -1/20 to 1/20 of the revolution speed, and a speed ratio of the rotation speed to the revolution speed is variably adjustable. A barrel tank receiver is attached to the rotation support shaft supported on the rotary table with its axis inclined at a predetermined angle with respect to the rotation main shaft,
2. The barrel polishing apparatus according to claim 1, wherein the barrel tank is coaxially housed and supported in the barrel tank receiver so as to be detachable from above. 2. The barrel polishing apparatus according to claim 1, wherein the driven gear and the main shaft gear are formed by a single gear. A plurality of the rotation support shafts are arranged at equal intervals in the circumferential direction at the outer periphery of the rotary table, and a single main shaft gear is drivably connected to the rotation gears attached to the plurality of rotation support shafts, forming a main shaft gear shared structure.
2. The barrel polishing apparatus according to claim 1 . A barrel polishing apparatus in which a barrel tank filled with workpieces and abrasives revolves in a horizontal direction, thereby applying centrifugal force to the workpieces and the abrasives in the barrel tank, and polishing the workpieces by rubbing against each other,
The apparatus comprises a revolving means for revolving the barrel tank in a horizontal direction, a rotation means for rotating the barrel tank about its axis in the horizontal direction, and a control means for automatically controlling the revolving means and the rotation means in cooperation with each other,
the revolution means includes a rotary table that is attached horizontally to a vertical main rotation shaft and is rotationally driven at a predetermined revolution speed, and a revolution drive unit that rotationally drives the main rotation shaft;
The rotating means includes a rotation support shaft that is rotatably supported on the rotary table in a vertical state parallel to the main rotation shaft and is driven to rotate at a predetermined rotation speed, and a rotation drive unit that drives the rotation support shaft, and the barrel tank is attached to the rotation support shaft in a state inclined with respect to the main rotation shaft,
the revolution drive unit is a revolution drive motor directly connected to the main rotation shaft,
the rotation drive unit includes a rotation drive motor and a gear mechanism that transmits the rotation drive force of the rotation drive motor to the rotation support shaft,
The gear mechanism is composed of a first transmission mechanism consisting of a drive gear attached to the output shaft of a rotation drive motor, a driven gear supported on the main rotation shaft so as to be freely rotatable, and a toothed belt which drive-connects these two gears, and a second transmission mechanism consisting of a rotation gear attached concentrically and integrally to the main rotation shaft, a main shaft gear supported on the main rotation shaft so as to be freely rotatable, and an intermediate gear which drive-connects these two gears,
the driven gear of the first transmission mechanism and the main shaft gear of the second transmission mechanism are coaxially and integrally coupled to each other,
the control means is configured to control the revolution drive motor of the revolution means and the rotation drive motor of the rotation means so that the revolution speed and the rotation speed of the barrel tanks are set to an arbitrary speed ratio by independently adjusting and setting the revolution speed and the rotation speed of the barrel tanks,
As a result, the barrel tank is horizontally revolved around the axis of the main rotating shaft at a predetermined revolution speed, and rotates around the axis of the support rotating shaft at a slow predetermined rotation speed that is significantly slower than the revolution speed, or stops.
A barrel polishing machine, characterized in that the rotation speed is set to -1/20 to 1/20 of the revolution speed, and a speed ratio of the rotation speed to the revolution speed is variably adjustable. 6. The barrel polishing apparatus according to claim 5, wherein the driven gear and the main shaft gear are formed by a single gear. 6. The barrel polishing machine according to claim 5, wherein a plurality of the rotation support shafts are arranged at equal intervals in the circumferential direction at an outer periphery of the rotary table, and a single main shaft gear is drivingly connected to the rotation gears attached to the plurality of rotation support shafts, thereby forming a main shaft gear shared structure. 6. The barrel polishing apparatus according to claim 1, further comprising a speed setting means for setting the revolution speed and the rotation speed of the barrel tank. The barrel polishing machine according to claim 1 or 5, characterized in that it is provided with a speed ratio setting means for setting the speed ratio between the revolution speed and the rotation speed of the barrel tank. 6. The barrel polishing machine according to claim 1, wherein the revolution speed of the barrel tank is set to 100 to 300 revolutions per minute. 6. The barrel polishing machine according to claim 1, wherein an inclination angle of an axis of the barrel tank is set to 10 degrees to 30 degrees.

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