JPH06320411A - Barrel polishing method - Google Patents

Abstract

PURPOSE:To prevent a work from being dented and broken by filling a polishing vessel with a liquid, then charging a work into the vessel, and polishing the work after discharging the liquid. CONSTITUTION:A discharge port 14a of the lower part of a polishing vessel 14 is closed, and water is filled in the polishing vessel 14. A mass comprising a work, a media and a compound is charged from a supply bucket 50 into the polishing vessel 14. A designated amount of mass is settled in the liquid to be accommodated in the polishing vessel 14. Subsequently, the discharge port 14a is opened to discharge the water. After discharging the water, the polishing vessel 14 is operated by a driving device 12, and a longitudinal shaft 11 is rotated to rotate a disc-like base plate 8 horizontally. Thus, the mass is repeatedly raised, turned and lowered along the inner peripheral wall of a liner 7 of a fixed cylinder by centrifugal force to perform polishing. Thus, the work is charged into a liquid so that shock at the time of charging can be lessened, and furthermore, as the mass is separated and slowly settled, the work can be prevented from being dented and broken.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a barrel polishing method capable of effectively preventing a work from being scratched or chipped when the work is put into the polishing tank or discharged from the polishing tank. Is.

[0002]

2. Description of the Related Art A mass of work, media, compound, etc. is put into a polishing tank, and the polishing tank is rotated or vibrated so that the mass is swirled and flowed in the polishing tank by centrifugal force. Centrifugal flow type or vibration type barrel polishing methods such as rounding have been widely known (see, for example, Metal Surface Technology Course 3, “Surface Polishing Method”, Metal Surface Technology Association (Asakura Shoten)). .

However, in the conventional barrel polishing method of this kind, since the mass is simply dropped from the supply bucket into the polishing tank to the discharge chute, the mass is introduced.
There has been a problem that the work is hit or chipped due to the contact between the works or the collision with the polishing tank during the fall or the drop into the polishing tank. On the other hand, even when the processed work is discharged from the polishing tank, for example, the polishing tank is tilted and inverted so as to be naturally dropped to the next sorting device or the like. However, there is a problem that the work may be scratched or chipped due to the collision. As a result, particularly in the case of a work that is vulnerable to impacts such as ceramic parts and roller of a bearing or in which the generation of dents is disliked, defective products frequently occur and the yield rate decreases.

[0004]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to solve the above-mentioned problems of the prior art, and when the work is put into the polishing tank or discharged from the polishing tank. It is an object of the present invention to provide a barrel polishing method which can effectively prevent the work from being scratched or chipped and can greatly improve the processing efficiency and the yield.

[0005]

The present invention, which has been made to solve the above-mentioned problems, is characterized in that a polishing tank is filled with a liquid, a work is introduced, the liquid is discharged, and barrel polishing is performed. The first invention is a barrel polishing method
A second invention is a barrel polishing method characterized by barrel-polishing in a polishing tank and discharging the mass after polishing through an intermediate hopper filled with a liquid. A third aspect of the present invention is a barrel polishing method, characterized in that the liquid is discharged, the liquid is discharged, barrel polishing is performed, and the mass after polishing is discharged through a hopper filled with the liquid.

According to the present invention, when a work is put into the polishing tank or discharged from the polishing tank, the polishing tank and the discharged hopper are filled with a liquid such as water, which is not directly related to barrel polishing, to buffer the liquid. The feature is that it tries to eliminate dents on the work by its action. That is, according to this method, since the liquid surface of the liquid filled in the polishing tank or the hopper serves as a primary drop surface, the distance that the workpiece falls is shortened, the liquid absorbs the impact, and the workpiece is Since this liquid causes the liquid to slowly settle in the liquid, it is possible to prevent the work that is put into the polishing tank or the hopper from being scratched or chipped, and to efficiently process with a high yield rate. It is needless to say that even if polishing materials such as media and compounds are put into the polishing tank in advance, these polishing materials may be put into the polishing tank together with the work.

Although cheap water is generally used as a liquid to fill the polishing tank and the hopper, the liquid to be filled in the polishing tank should be water, as well as a polishing liquid, an anticorrosive agent and the like. In this case, when the liquid is discharged from the polishing tank, a part of the liquid may be left in the polishing tank and reused as the polishing liquid. Further, as the polishing tank, it is possible to use all types of polishing tanks such as a centrifugal flow type barrel polishing tank, a planetary rotation type barrel polishing tank, a box type or a circle type vibrating barrel polishing tank.

[0008]

Example of Actual Rotation Next, one example of actual rotation in the case of using the illustrated centrifugal flow type polishing tank capable of tilting and reversing the present invention will be described in detail. Reference numeral 1 is a base, and bearings 3 are installed correspondingly to a pair of gate-shaped frames 2 and 2 which are erected on the base, and a plate-like rotating frame having an open top between the bearings 3 and 3. 4 is rotatably supported by horizontal shafts 5 and 5 projecting from both sides thereof. A fixed cylinder body 6 having a liner 7 made of polyurethane or the like attached therein is connected and fixed to the upper open side of the rotating frame 4. Reference numeral 8 denotes a dish-shaped bottom plate which is positioned along the inner side of the rotating frame 4 with a space therebetween. The dish-shaped bottom plate 8 is mounted on a bearing 10 provided on a boss portion 9 at the bottom center of the rotating frame 4. It is horizontally fixed to the supported vertical axis 11. The lower end of the vertical axis 11 is connected to a drive shaft of a drive device 12 including a motor or the like, and the dish-shaped bottom plate 8 is horizontally rotatable within the rotating frame 4. A liner 13 similar to the liner 7 is attached to the surface of the dish-shaped bottom plate 8, and the upper surface of the annular projection formed on the outer peripheral side of the liner 13 slides on the lower surface of the liner 7 of the fixed cylindrical body 6. Both liners 7 and 13 are brought into contact with each other as much as possible to form a continuous structure, and the polishing tank 14 is formed as described above. Reference numeral 14a is a discharge port provided in the lower portion of the polishing tank 14 which can be opened and closed, and 50 is a supply bucket for supplying a mass into the polishing tank 14.

A chain gear 15 is fixed to one of the horizontal shafts 5, and this chain gear 15 is connected to a chain gear 18 of a motor 17 of the base 1 via a chain 16 and driven by the motor 17 to rotate a rotating frame. 4 is capable of rotating in the vertical direction with the polishing tank 14 in the vertical plane about the horizontal axes 5 and 5. Reference numeral 19 is a guide chute having a U-shaped cross section provided on the mass discharge side of the polishing tank 14 for reducing the head. The bottom plate portion 21 has a curved surface in an arc shape centered on the horizontal axis 5 which is the tilt reversal center of the polishing tank 14, and its tip end falls while rolling or sliding on the bottom plate portion 21. It is exposed to the hopper 22 that contains the liquid for reducing the falling speed of the mass.

The hopper 22 has an elastic member 24 supported by a suitable number of support arms 23 provided on the gate frames 2 and 2.
It is elastically supported between the gate-shaped frames 2 and 2, and a vibration motor 25 is attached to one side thereof. A discharge port 27 for the mass is formed in the lower part of one side wall 26 of the hopper 22, and a door 28 for opening and closing the discharge port 27 is provided outside thereof.
Is located. The outside of the door 28 is rotatably connected to one end of a connecting plate 29 that is rotatably attached to a supporting metal fitting 26a of the inclined portion of the outer wall 26, and the other end of the connecting plate 29 is provided on the outer wall 26 so as to project. A tip of a piston rod 32 of a fluid pressure cylinder 31 rotatably attached to a bracket 30 is rotatably connected, and the door 28 opens and closes the discharge port 27 by the movement of the piston rod 32 by the operation of the fluid pressure cylinder 31. It is configured to be closed or open. Further, a straight 33 having a large number of through holes through which the liquid can pass but the mass cannot pass is attached to the outlet 28 side of the door 28, and a drain port 34 is formed in the door 28. A thin fluid pressure cylinder 36 is fixed to the end of a cylindrical body 35 protruding from the drain port 34, and a valve 38 is fixed to the tip of a piston rod 37 of the fluid pressure cylinder 36. When the piston rod 37 moves back and forth due to the operation, the bubble 38 slides in the tubular body 35 to close or open an opening (not shown).

Reference numeral 39 is a drop mass guide plate provided in the polishing tank 14 below the tip of the guide chute 19;
Is a liquid supply pipe attached to the other side wall 40 of the hopper 22,
A sorting device 42 is provided below the discharge port 27 of the hopper 22.
Is installed. The sorting device 42 has an appropriate number of elastic members 43.
It is elastically supported by the base 1, and a screen 45 is horizontally stretched in the middle of the trough 44. A work carrying-out port 46 is exposed on the screen 45 in the trough 44 on the tip side of the screen 45. In addition to being formed, a take-out opening 47 for the media or the like that has passed through the screen 45 and dropped is formed below the screen 45 on the tip side, and a vibration motor 48 is provided on the side wall of the trough 44. It is fixed, and 49 is when the polishing tank 14 is tilted and inverted,
A mass diaphragm plate for allowing the internal mass to properly flow out to the guide chute 19 side, which is attached to the side of the upper end of the polishing tank on the reverse side at a predetermined interval, and S denotes the liquid surface in the hopper 22.

In the case of such a structure, the polishing tank 14 is first closed with the discharge port 14a at the bottom of the polishing tank 14 being closed.
After filling the inside with water, from the supply bucket 50 to the polishing tank 14
A mass of work, media, compound, etc. is put therein and the mass is allowed to settle in the liquid, whereby a predetermined amount of mass is accommodated in the polishing tank 14. At this time, since the distance between the liquid surface and the supply port of the supply bucket 50 is short, the impact when the workpieces in the mass fall is sufficiently buffered, and the masses thrown in collectively disperse in the liquid slowly. Therefore, the work is effectively prevented from being scratched or chipped.

When the mass is put into the polishing tank 14 in this way, the discharge port 14a is opened and the polishing tank 1 is opened.
When the polishing tank 14 is operated by the drive device 12 after draining the water in 4, the vertical axis 11 rotates and the dish-shaped bottom plate 8 rotates horizontally, and the mass of the loaded work etc. is fixed by centrifugal force. The cylindrical body 6 swings and descends along the inner peripheral wall of the liner 7 while being raised, and the work of polishing is performed by this flow motion. Then, the drive unit 12 is stopped when the predetermined polishing time is over. Then, a predetermined amount of water or a liquid containing an appropriate amount of rust preventive component added thereto is put into the hopper 22 from the liquid supply pipe 41, and the motor 17 is activated to start the chain gear 1.
When the horizontal shafts 5 and 5 are rotated counterclockwise in FIG. 1 via 8, the chain 16 and the chain gear 15, the rotating frame 4
At the same time, the polishing tank 14 rotates in the direction of the arrow in FIG. 3, and the polishing tank 14 is in a downward posture. Polishing tank 14
The internal mass overflows from between the mass throttle plates 49, 49 and is discharged to the guide chute 19 side, and rolls or slides down along the bottom plate portion 21 thereof, and these successively drop into the liquid of the hopper 22, and this liquid Due to the liquid resistance in the middle passage, the falling speed is reduced and the particles settle down on the guide plate 39.

After the polishing tank 14 has rotated a predetermined amount to finish discharging the internal mass, the motor 17 is rotated in the reverse direction to polish the polishing tank 1.
Return 4 to its original position. At the same time, the fluid pressure cylinder 36 is actuated to move the bubble 3 through the piston rod 37.
When 8 is retracted and an opening (not shown) formed in the cylindrical body 35 is opened, only the liquid in the hopper 22 is removed through the discharge port 27 and the strainer 33. After that, when the fluid pressure cylinder 36 is reversely actuated to return the valve 38 and the fluid pressure cylinder 31 is actuated to retract the piston rod 32, the connecting plate 29 is rotated around the connecting pin portion of the support fitting 26a. Door 28 swings outward, and outlet 27 is opened. Simultaneously with this, when the vibration motors 25 and 48 are operated, the mass collected in the hopper 22 without impact is gradually advanced by the vibration of the hopper 22 and is discharged from the discharge port 27 and onto the screen 45 of the sorting device 42. After being transferred, it moves on the screen 45 in the direction shown by the arrow in FIG.
Is transported to the outside.

When the discharge of the mass in the hopper 22 is completed,
The vibration motor 25 is stopped, the fluid pressure cylinder 31 is reversely operated, the piston rod 32 is moved forward, the door 28 is pressed against the discharge port 27 through the connecting plate 29, and the discharge port 27 is closed. The liquid is supplied to the hopper 22 until it reaches a predetermined liquid surface S by opening, and when the feeding of the mass or the like in the sorting device 42 is completed, the vibration motor 48 is stopped to complete one cycle of the polishing work. The reversing operation of the polishing tank 14 is performed by an intermittent operation that incorporates a temporary stop or a shift operation that appropriately incorporates a slow speed operation. Further, the discharge port 27 is exclusively used for mass discharge, liquid is discharged through another liquid discharge port separately installed in another position of the hopper 22, and the door 28 is of a slide gate type. Of course,

Incidentally, as a result of polishing a ceramics part for home appliances of φ17 mm × height 16 mm by using such a barrel polishing apparatus, the occurrence of chipping defects and the like when the mass is put into the polishing tank is 1 in 70 ( Yield rate of 98.5% or more),
In addition, one out of 70 chips (yield rate 98.5% or more) caused chipping defects when discharging the mass from the polishing tank, which was 75-80% in comparison with the conventional method. It was confirmed that the yield rate could be improved significantly.

[0017]

As is apparent from the above description, the present invention effectively causes the occurrence of scratches or chipping of the work which tends to occur when the work is put into the polishing tank or discharged from the polishing tank. It is possible to prevent the impact, and it is possible to greatly improve the processing efficiency and the yield. Especially, the liquid for buffering the impact is not only when the work is put into the polishing tank but also when it is discharged from the polishing tank. Can improve the efficiency and yield of a series of barrel polishing operations. Therefore, the present invention is extremely useful as a barrel polishing method that eliminates the conventional problems and contributes to industrial development.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing a processing step of the present invention.

FIG. 2 is a partially cutaway front view showing an example of a barrel polishing apparatus used in the method of the present invention.

FIG. 3 is a partially cutaway side view showing an example of a barrel polishing apparatus used in the method of the present invention.

4 is a partially cutaway front view showing an operating state of a polishing tank in the barrel polishing apparatus shown in FIGS. 3 and 4. FIG.

[Explanation of symbols]

 14 Polishing tank 14a Discharge port 22 Hopper 27 Discharge port

Claims (3)

[Claims] 1. A barrel polishing method comprising filling a polishing tank with a liquid, introducing a work, discharging the liquid, and performing barrel polishing. 2. A barrel polishing method characterized by barrel polishing in a polishing tank, and discharging the polished mass through an intermediate hopper filled with a liquid. 3. The polishing tank is filled with a liquid, then a work is introduced, the liquid is discharged, barrel polishing is performed, and the mass after polishing is discharged through a hopper filled with the liquid. Barrel polishing method.