JP5051167B2 - Processing method of ferrous metal parts - Google Patents

Description

  The present invention relates to a method for processing an iron-based metal part, and more particularly to a method for rounding corners (ridge corners) on both end faces of a cylindrical iron-based metal part.

  Here, examples of the columnar iron-based metal parts include shafts of acoustic equipment, video equipment, small motors, and roller bearings of various rotary machine devices.

  Cylindrical iron-based metal parts are usually rounded at the corners (ridge corners) of the end faces on both sides of a cylindrical material (workpiece) prepared by cutting an iron-based round bar to a predetermined length. It is necessary to chamfer.

  The rounding chamfering has been conventionally performed by cutting such as turning one by one as described in paragraph 0014 of Patent Document 1. In addition, in patent document 1, it describes that each roller after a chamfering process is made to collide with the inner surface of a container within a barrel, and a hardening process is performed (refer Claims etc.).

  However, since the chamfering method performs chamfering one by one, it is very troublesome and labor-intensive. This tendency increases as the cylindrical material has a small diameter (for example, less than 5 mm).

  In addition, Patent Document 2 does not include rounding of only the ridge angle portion (intersection angle of the surface and the surface) as in the present invention, but the end R surface in which the end surface of the shaft (cylindrical iron-based metal part) has an arc shape. A method is described in which machining is continuously fed and cut one by one.

  Patent Document 3 is a prior art document previously filed by the present inventors, in which a similar configuration of a fluid barrel polishing apparatus used in the present invention is described.

JP 2009-14126 A Japanese Patent Publication No. 6-39046 JP 2009-12085 A

  In order to solve the above-mentioned problems, in order to round off both end corners (ridge corners) of a cylindrical iron-based metal part, many barrels are formed by wet barrel polishing using a rotating barrel or a fluid barrel. It is conceivable that the number of processes for the chamfering (rounding) process can be greatly reduced by processing the cylindrical material simultaneously.

  However, when rounding is performed by wet barrel polishing by the method, the outer peripheral surface side sag amount Rx of the workpiece W tends to be larger than the end surface side sag amount Ry, and a long polishing time is required. (See FIG. 1C and Comparative Example 1), and the surface roughness of the outer peripheral surface of the workpiece W is “rough”. It is necessary to perform finish polishing to smooth the roughness, make the sagging amount Rx on the outer peripheral surface side substantially equal to the sagging amount Ry on the end surface side, and form a cylindrical shape in the axial direction so as to align the outer dimensions to a specified value. is there.

  However, as described above, if the dimension of the sagging amount Rx on the outer peripheral surface side is longer than the sagging amount Ry on the end surface side of the workpiece W, the polishing amount in the axial diameter direction for aligning the outer peripheral surface shape in the axial longitudinal direction into a cylindrical shape. Further, if the polishing process is further performed in order to make the shaft diameter dimension equal to the specified value, the sagging amount Rx on the outer peripheral surface side may be less than the allowable value or disappear as shown in FIG. .

  The present invention addresses the above-mentioned problems, and approximates the amount of sagging on the outer peripheral surface side and the amount of sagging on the end surface side in a machining method for rounding a ridge corner of a cylindrical iron-based metal part. Another object of the present invention is to provide a method for processing an iron-based metal part that can be easily (homogenized) and can be rounded in a short time.

  The present invention solves the above problems by a “processing method of iron-based metal parts” comprising the following means (invention specific matter) (reference numerals are attached for reference).

A processing method for rounding the corners W2 of the end faces W1 on both sides of a cylindrical iron-based metal part (work) W,
Performed by a barrel polishing process for simultaneously processing a large number of workpieces W having corners W2 on the end face W1,
The barrel polishing step
A first step of plastically deforming the corner portion W2 of the workpiece W to form a curved convex portion a on the outer peripheral end portion of the end surface W1 and leaving a planar portion b having a diameter smaller than the outer diameter of the workpiece on the end surface W1; as well as,
A second step in which the curved protrusion a is polished and removed so that a roundness R is formed;
It is characterized by including these two steps.

  And in the said processing method of an iron-type metal component, the polishing tank (polishing process chamber) comprised by the cylindrical fixed tank 22 by which the upper part was open | released, and the turntable 24 rotated horizontally at the bottom part of this fixed tank 22 is. It is preferable that the first step is performed by dry fluid barrel polishing and the second step is performed by wet fluid barrel polishing using the fluid barrel polishing apparatus 10 having 12.

  The fluidized barrel polishing apparatus according to the present invention has a small batch size and can be processed in a short polishing time as compared with the conventionally used horizontal rotation type, and therefore, it is possible to process small lots and a variety of products. . While the throughput of one batch of the fluid barrel polishing apparatus of the present invention is 100 to 200 kg, the conventional horizontal rotary type is 500 to 200 kg, which requires a large capacity and requires a long polishing time.

It is explanatory drawing of the effect | action in the chamfering of the Example and comparative example of this invention. It is a schematic sectional drawing which shows an example of the fluid barrel grinding | polishing apparatus attached to the dust collector suitable for using for the barrel grinding | polishing of this invention. It is a model perspective view (A) and action explanation top view (B) which show an example of the barrel polish tank in the 1st process. It is a model perspective view (A) which shows other examples of a barrel polish tank in the 1st process, an operation explanation top view (B), an action explanation perspective view (C), and (D).

  About the outline of the chamfering processing method which processes the corner | angular part W2 of the end surface W1 of the both sides of the iron-type metal component whose shape of the workpiece | work W which concerns on this invention is a column shape into a round R shape using a barrel polishing apparatus, FIG. I will explain.

  The chamfering method of the present embodiment is a barrel polishing capable of simultaneously processing a plurality of rounded rounding processes for the corners W2 of the end surfaces W1 on both sides of the cylindrical workpiece W having the corners W2 on both end surfaces W1. It is performed using an apparatus, and the first feature is that the processing step is performed in the following two steps: a first step and a second step. Note that the cylindrical iron in which the outer peripheral surface of the workpiece W after the first step and the second step of the present invention is smoothed and the outer diameter is made uniform, and the corner portions W2 of the end surfaces W1 on both sides are rounded and rounded. In order to obtain a product of a metallic metal part, finish polishing is performed using the rotating grindstone or the like.

  1) The first step plastically deforms the corners W2 of the end faces W1 on both sides of the work W having a cylindrical shape, and the outer diameter of each of the end faces W1 is larger than the outer diameter of the work W. A curved convex portion a is formed. At this time, the planar portions b having a diameter smaller than the outer diameter of the workpiece W remain on the end surfaces W1 on both sides of the workpiece W.

  2) In the second step, the curved convex portions a formed in the first step are polished and removed, and roundness R is formed at the corner portions W2 of the end surfaces W1 on both sides of the workpiece W. That is, the hatched portion in the partially enlarged view of FIG. 1B is polished and removed, and the sagging amount on the outer peripheral surface side is Rx and the sagging amount on the end surface side is Ry at the corner W2 of the end surface W1 on both sides of the workpiece. Round R is formed.

  Here, it is desirable that the sagging amounts Rx and Ry be as equal (approximated) as possible. For example, when the set sag amounts Rx and Ry are both 0.45 mm, the allowable error is −0 mm + 0.4 mm as will be described later.

    Next, the details of the processing situation when the fluid barrel polishing apparatus is used in both the first step and the second step according to the present invention will be described more specifically with reference to FIG.

  The polishing tank (polishing processing chamber) 12 in the polishing apparatus main body 10 of the fluid barrel polishing apparatus includes a cylindrical fixed tank 22 having an open top, and a rotating disk (fluidizing means) that rotates horizontally at the bottom of the fixed tank 22. 24.

  Then, processing is performed by the “dry method” in the first step and the “wet method” in the second step.

(1) First step:
The polishing tank 12 in the first step may have a circular inner peripheral cross section, but preferably has a pentagonal decagonal inner cross section as shown in FIG. Further, the inner peripheral wall surface 12a of the polishing tank 12 may be formed of a conventional wear-resistant rubber (for example, urethane liner), but is formed of a heat conductive rigid material (iron-based or ceramic) harder than the workpiece W. It is desirable. As the rigid material harder than the workpiece W, for example, when the workpiece W is SUJ-2, high-chromium cast steel is used.

  Compared to the case where the inner circumferential cross-sectional shape of the polishing tank 12 is round and the inner wall surface is formed of wear-resistant rubber, the workpiece W is collided with the inner circumferential wall surface 12a of the polishing tank of the fixed tank 22. This is because the formation of the curved convex portion a in the outer peripheral portion of the end face W1 is easily promoted. Moreover, by making the inner peripheral surface of the fixed tank 22 a heat conductive rigid material, heat dissipation is promoted, and the temperature rise in the polishing tank 12 due to the collision between the workpieces and the work and the inner peripheral wall surface 12a of the polishing tank can be suppressed. In general, a wear-resistant rubber liner made of urethane rubber or the like is attached to the inner peripheral surface of the fixed tank 22 so as to take measures against wear of the fixed tank 22. The plastic deformation acting force for forming the curved convex portion a in the first step of the present invention is weak due to the elasticity of the conductive rubber, and the processing time is not only long, but also due to the temperature rise and heat generation in the polishing tank 12 due to polishing processing Since the wear of the wear resistant rubber liner is promoted and cannot play its role, it is not suitable for the present invention.

  Regarding the material, the same applies to the turntable 24, and it is desirable that the upper surface is not a wear-resistant rubber liner but is a heat-transfer rigid material harder than the workpiece. However, when the upper surface of the rotating disk 24 is formed of a rigid material, the work slides on the upper surface of the rotating disk 24 and the fluid action force is suppressed. It is necessary to form a non-slip rib 24a as shown in FIG.

  Moreover, it is desirable to arrange the mass flow disturbance member 27 of the workpiece W on the inner peripheral wall surface of the fixed tank 22 or in the vicinity thereof, as shown in FIGS. By promoting the mass flow disturbance of the workpiece W, the collision energy of the workpiece W against the inner peripheral wall surface 12a of the polishing tank 12 is increased, and the plastic deformation action is increased, thereby forming the curved convex portion a on the outer periphery of the end surface of the workpiece W. Is promoted. The shape of the mass flow disturbing member 27 is arbitrary, such as a round bar (FIGS. 4B and 4C), a prism, an angle material, a strip material, etc. (FIG. 4D).

  In this first step, the outer peripheral speed of the rotating disk 24 varies depending on the material and size of the work W. However, the work W is made of, for example, carbon steel and the outer diameter of the cylinder is within 5 mm, and the shaft diameter ratio is 2/1. In the case of -10/1, it is desirable to adjust the rotational speed of the turntable so as to be 6 to 20 m / s. If it exceeds 20 m / s, there is concern about deformation (bending) of the workpiece W having a small shaft diameter ratio (thin diameter and long shaft length), and if it is less than 6 m / s, plastic deformation necessary for the workpiece W is formed. Difficult to form or long processing time to form (see Example 6).

  The first step is dry, and generates heat and generates abrasion powder. Therefore, suction is performed while spraying cooling water intermittently into the polishing tank, and dust is collected in the dust collector 44 as shown in FIG. Introduce. Since there is a risk of dust explosion, the inside of the polishing tank needs to be controlled to 40 to 60 ° C. or lower.

(2) Second step The second step is performed wet using an abrasive. That is, the polishing tank 12 is filled with water, abrasive (media type or compound type), and deposition inhibitor together with the workpiece. Here, the purpose of the anti-deposition agent to be added is that the abrasion powder of the abrasive after polishing and the abrasion powder of the work W are in contact with the water from the sliding contact gap S between the fixed tank 22 and the outer peripheral portion of the rotating plate 24 in the fixed tank 22. It flows into the lower space (lower flow path) 25 of the bottom surface and the rotating disk 24, circulates (returns) in the polishing tank 12 during polishing, and is discharged out of the polishing tank 12 after polishing. At that time, abrasive wear powder and wear powder of the workpiece W are prevented from accumulating in the bottom surface of the fixed tank 22 and the lower space (lower flow path) 25 of the rotating plate 24.

As a deposition inhibitor, slaked lime (Ca (OH) ₂ ) is desirable. For example, 30 to 100 g of slaked lime is added to 5 L of water and 800 g of abrasive. If there is too little slaked lime as an anti-deposition agent, the anti-deposition effect cannot be expected, and if there is too much slaked lime, the fluidity of the workpiece W and the abrasive is hindered, and wet polishing processability decreases.

  The first step (dry barrel polishing) and the second step (wet barrel polishing) may be performed in separate polishing tanks (polishing apparatuses), respectively, but polishing by a fluid barrel polishing apparatus as shown in FIG. The apparatus main body 10 includes a dust collector (decompression suction device) 44, and the dust collector 44 is connected to a lower space 25 formed between the bottom of the fixed tank 22 and the lower side of the rotating plate 24 by a fluid discharge pipe 42. If the fluid discharge pipe 42 is provided with a communication opening / closing valve 46 on the polishing tank side and an exhaust / drainage switching valve 48 on the front side of the dust collector 44, the first step requiring the dry barrel polishing. And the second step requiring wet barrel polishing can be processed with a single fluid barrel polishing apparatus.

  Specifically, the one shown in FIG. 2 of Patent Document 3 can be used, and paragraphs 0030 to 0035 of Patent Document 3 are cited with some modifications as follows.

  The main components of the entire apparatus include a polishing apparatus main body 10, a liquid supply device (liquid supply means) 14, and a fluid discharge device (liquid / gas discharge means) 18.

  The polishing tank (polishing processing chamber) 12 of the polishing apparatus main body 10 includes a fixed tank 22 and a rotating disk (fluidizing means) 24. Specifically, the polishing tank 12 has a vertically open vertical cylindrical shape, and the rotating disk 24 has a sliding contact gap S on the inner periphery of the bottom of the fixed tank 22 and can be driven and rotated. That is, the center of the rotating disk 24 is connected to a drive rotary shaft 26, and the rotary shaft 26 is driven and rotated by a speed reducer 30 connected to a main shaft motor 28 and a pulley (belt transmission).

  The liquid supply device 14 normally includes a polishing liquid tank 32, a water tank (cooling / cleaning liquid tank) 32A, and a liquid supply pipe 34 that connects the bottoms of the tanks 32 and 32A and the liquid supply port 22a of the polishing tank 12. It consists of. The liquid supply pipe 34 includes a switching valve (not shown) and a supply pump 36 so that a polishing liquid or a cooling liquid (cleaning liquid) can be selectively pumped and supplied to the polishing tank 12. An on-off valve (not shown) may be provided on the discharge side of the supply pump 36 as appropriate.

  The fluid discharge device 18 includes a fluid discharge pipe 42 and a vacuum suction device (dust collector) 44. The fluid discharge pipe 42 includes an opening / closing valve 46 and an exhaust / drainage switching valve 48 from the polishing tank 12 side, and the original pipe section 42 a is connected via the exhaust / drain switching valve (dust collection / drainage switching valve) 48. Are branched into two-way branch pipe portions 42b and 42c, and one of the branch pipe portions 42b is a drainage system and the other 42c is an exhaust system, and a liquid discharge means and a gas discharge means are formed respectively. Yes.

  Further, a vacuum suction device 44 is connected to the distal end side of the branch pipe portion 42c of the exhaust system. In general, the vacuum suction device 44 is a dust collector (dust collector) 44 having a vacuum pump 50 and a bag filter (filter cloth) 52 on the suction side of the vacuum pump 50. The dust collecting means is not limited to bag filter dust collection, and other filter dust collection, further centrifugal dust collection, electric dust collection, and the like can be applied.

  The common test conditions and evaluation criteria adopted in the tests of Examples, Comparative Examples, and Reference Examples carried out to confirm the effects of the present invention are as follows.

1) Barrel polisher used for the first step test Dry flow barrel polisher ("EVF-04D type" manufactured by Shinto Brater Co., Ltd .: Polishing tank actual capacity 40L); As shown in FIG. All the turntables were urethane liner linings, and the inverters were variable up to a rotation speed of 1000 min- ¹ . A dust collector is connected.

2) Barrel polisher used for the second step test Wet fluid barrel polisher ("EVF-04 type" manufactured by Shinto Brater Co., Ltd .: Polishing tank actual capacity 40L), Fixed tank inner peripheral shape: Round shape, Material : Carbon steel 3) Workpiece: Bearing steel SUJ2, Φ2mm × 5mm, (Example 2: Φ2mm × 15mm)
4) Abrasive material used for the test in the second step: Silicon carbide (“CF150” manufactured by Shinto Brater Co., Ltd.)
5) Anti-deposition material used in the second step test: slaked lime 6) Rust prevention compound used in the second step test: ("SLR" manufactured by Shinto Blator Co., Ltd.)
7) Evaluation criteria for sagging amount: The target sagging amounts Rx and Ry were both 0.45 mm, and evaluation was performed according to the following criteria.

    A: Rx and Ry both have a sag amount error of −0 mm + 0.1 mm.

    ○: The sag amount error of at least one of Rx and Ry exceeds −0 mm + 0.1 mm, but is within −0 mm + 0.4 mm.

    X: A sag amount error of at least one of Rx and Ry exceeds −0 mm + 0.4 mm.

  8) Evaluation criteria for treatment time: Evaluated based on the total time of the first step and the second step, and evaluated according to the following criteria.

◎: Within 14h in total, ○: Over 14h within 16h, △: Over 16h within 20h,
×: Over 20h

  The processing steps of each Example / Comparative Example / Reference Example, the conditions for cleaning / rust prevention treatment and the evaluation results are shown below individually. Only the differences from Example 1 are described.

Example 1
1) First step: 15 kg of a workpiece (size: Φ2 mm × 5 mm) was put into a polishing tank, and dry polishing was performed for 6 hours at a rotation speed of 500 min ⁻¹ (peripheral speed was 10.5 m / s). This treatment was performed while jetting 10 mL of cooling water every 20 seconds and sucking with a dust collector.

2) Second step: Into the polishing tank, 15 kg of the work after the first step, 5 L of polishing water, 800 g of abrasive, and 50 g of an anti-deposition agent are added, and the rotation speed is 300 min ⁻¹ (the outer peripheral speed is 6.3 m). / S) for 5 hours.

3) Washing and rust prevention treatment: The valve was opened, and washing treatment was performed for 2 minutes at a rotation speed of 300 min- ¹ while flowing 10 L of water per minute. Thereafter, the drain valve was closed and 50 mL of 10 L of water and an antirust compound were added, and an antirust treatment was performed for 1 minute.

  Evaluation result: The processing time was 11 hours in total (6 hours for the first step, 5 hours for the second step). The sagging amount was Rx = 0.48 mm and Ry = 0.50 mm, and the sagging amount evaluation was “◎”.

(Example 2)
1) First step: 15 kg of a workpiece (size: Φ2 mm × 15 mm) to be put into the polishing tank was put in and processed at a rotational speed of 350 min ⁻¹ (peripheral speed was 7.3 m / s) for 2 hours. This treatment was performed while jetting 10 mL of cooling water every 20 seconds.

2) Second step: The work after the first step, 5 L of polishing water, 800 g of polishing material, and 50 g of an anti-deposition agent are charged into the polishing tank, and the rotational speed is 300 min ⁻¹ (the outer peripheral speed is 6.3 m / s). ) For 5 hours.

  3) Cleaning / rust prevention treatment: The treatment was performed for 2 minutes at a rotation speed of 300 revolutions per minute while opening a valve and flowing 10 L of water per minute. Then, the drain valve was closed and 10 L of water and 50 mL of rust preventive compound were added and treated for 1 minute.

  Evaluation result: The processing time was 4 hours in total (2 hours for the first step and 2 hours for the second step). The sagging amount was Rx = 0.48 mm and Ry = 0.50 mm, and the sagging amount evaluation was “◎” for both Rx and Ry.

Example 3
Four φ9 mm iron bars were installed at equal intervals at a position 2 cm inward from the outer wall of the polishing tank.

  First step: 15 kg of workpiece is put into a dry barrel polishing tank and treated for 5 hours at 500 rpm (peripheral speed is 10.5 m / s). This treatment was performed while jetting 10 mL of water every 20 seconds.

  Second step: The above work, 5L of water, 800g of abrasive and 50g of anti-deposition agent are added to the wet fluidized barrel polishing tank at a rotation speed of 300 revolutions per minute (peripheral speed is 6.3m / s) Treated for 4.5 hours.

  Cleaning and rust prevention treatment: The treatment was performed for 2 minutes at a rotation speed of 300 revolutions per minute while opening the valve and flowing 10 L of water per minute. Thereafter, the drain valve was closed and 50 mL of 10 L of water and a rust preventive compound were added and treated for 1 minute.

  Evaluation results: The treatment time was 9.5 hours in total (5 hours for the first step, 4.5 hours for the second step). The sagging amount was Rx = 0.45 mm and Ry = 0.48 mm, and the sagging amount evaluation was “◎”.

(Comparative Example 1)
In Example 1, only the wet barrel polishing of the second step was performed in the same manner as in Example 1 without performing the first step, and polishing was performed until Ry = 0.50 mm. As a result, the polishing time required 48 hours. did. After that, cleaning and rust prevention treatment were performed.

  Evaluation results: The processing time was 48 hours, the processing time evaluation was: x, the sagging amount was Rx = 1.12 mm, Ry = 0.50 mm, and the sagging amount evaluation was x.

Example 4
In Example 1, the barrel polishing tank in the first step was made of carbon steel having a round horizontal cross-sectional shape.

  Evaluation results: The processing time was 18 hours in total (13 hours for the first step, 5 hours for the second step). The sagging amount was Rx = 0.49 mm, Ry = 59 mm, and the sagging amount evaluation was ◯.

(Example 5)
In Example 1, the dry barrel polishing tank of the first step made of octagonal urethane liner was used.

  Evaluation results: The processing time was 16 hours in total (11 hours for the first step, 5 hours for the second step). When Rx = 0.48 mm and Ry = 0.57 mm, the sagging amount was evaluated as ◯.

Example 6
In Example 1, the outer peripheral speed of the rotary disk of the dry barrel polishing tank in the first step was 3.1 m / s (150 min), but the processing time was 17 hours in total (12 hours in the first step, 5 hours in the second step). ), The processing time evaluation was △. The sagging amount was Rx = 0.49 mm, Ry = 0.58 mm, and the sagging amount evaluation: ○.

(Reference example 1)
In Example 1, the same procedure was performed except that the outer peripheral speed of the rotating disk of the dry barrel polishing tank in the first step was 20.9 m / s (1000 min ⁻¹ ) and the treatment time was changed from 30 minutes to 6 hours. In all cases, the entire end face was rounded, and the amount of sagging could not be evaluated.

(Reference example 2)
In Example 1, water was not sprayed on the dry barrel polishing tank in the first step, but when water was not sprayed, the temperature rose to 76 ° C in 30 minutes and 83 ° C in 1 hour, and there was a risk of dust explosion. The experiment could not be continued.

  Table 1 summarizes the main test conditions and test results of Examples 1 to 6 and Comparative Example 1 and the evaluation results thereof.

10 Barrel Polishing Machine Body 12 Fluid Barrel Polishing Tank (Polishing Processing Chamber)
12a Inner wall surface of polishing tank 22 Fixed tank 24 Inner wall surface of fixed tank 27 Mass flow disturbance member 42 Fluid discharge pipe 44 Dust collector W Work W1 End face on both sides of work W2 Corner of end face on both sides of work Rx Amount of sagging on work outer face Ry The amount of sag on the workpiece end surface side a Curved convex portion formed in the first step b The flat surface portion that remains on the workpiece end surface

Claims (9)

A processing method for rounding corners (ridge corners) of both end faces of a cylindrical iron-based metal part (hereinafter referred to as “work”),
Performed by a barrel polishing process that simultaneously processes a large number of the workpieces having ridge corners on the end face,
The barrel polishing step
A first step of plastically deforming the ridge corner portion of the workpiece and forming a curved convex portion on the outer peripheral end portion of the end surface so as to leave a flat surface portion having a diameter smaller than the outer diameter of the workpiece on the end surface; and
A second step of polishing and removing the curved convex portion to form the roundness;
A method for processing an iron-based metal part comprising the following two steps. Using the fluid barrel polishing apparatus provided with a polishing tank (polishing processing chamber) composed of a cylindrical fixed tank with an open top and a rotating plate that rotates horizontally at the bottom of the fixed tank, the first step 2. The method of processing an iron-based metal part according to claim 1, wherein the second step is performed by wet fluid barrel polishing. 3. The iron according to claim 2, wherein, in the first step, the peripheral speed of the outer peripheral portion of the sliding contact gap portion of the rotating disk with the fixed tank is set within a range of 6 to 20 m / s. Of processing metallic metal parts. In the second step, an abrasive (including a media type and a compound type), a deposition preventive material, and water are added to the workpiece that has undergone the first step in the polishing tank. Item 4. A method for processing an iron-based metal part according to Item 2 or 3. It is a fluid barrel polisher used for the 1st process of the processing method of the ferrous metal parts according to any one of claims 1 to 4,
A fluid barrel polishing apparatus characterized in that an inner peripheral cross-sectional shape of the fixed tank is a pentagonal and decagonal shape, and an inner wall surface of the fixed tank is formed of a heat conductive rigid material harder than the workpiece. 6. The fluid barrel polishing apparatus according to claim 5, wherein a mass flow disturbance member of the workpiece is disposed in contact with or in the vicinity of an inner peripheral wall surface of the fixed tank. 7. The fluid barrel polishing apparatus according to claim 6, wherein the rotating disk is made of a heat conductive rigid material, and the upper surface of the rotating disk has a non-slip shape. 8. The fluid barrel polishing apparatus according to claim 7, further comprising a liquid supply means for supplying a cooling liquid into the polishing tank and a suction means for sucking dust generated in the polishing tank. 9. A fluid barrel polishing apparatus according to claim 8, comprising a dust collector as the suction means, wherein a fluid discharge pipe connects between the dust collector and a bottom portion of the fixed tank (a flow path below the rotating disk). Is provided with a communication opening / closing valve on the polishing apparatus side and an exhaust / drainage switching valve on the dust collector side, and the wet polishing in the second step together with the dry polishing in the first step. A fluid barrel polishing apparatus characterized by being made possible.

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