WO2023162930A1 - Procédé de polissage au tonneau et matériau d'amortissement - Google Patents

Procédé de polissage au tonneau et matériau d'amortissement Download PDF

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Publication number
WO2023162930A1
WO2023162930A1 PCT/JP2023/006043 JP2023006043W WO2023162930A1 WO 2023162930 A1 WO2023162930 A1 WO 2023162930A1 JP 2023006043 W JP2023006043 W JP 2023006043W WO 2023162930 A1 WO2023162930 A1 WO 2023162930A1
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WO
WIPO (PCT)
Prior art keywords
cushioning material
polishing
amount
stone
barrel
Prior art date
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PCT/JP2023/006043
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English (en)
Japanese (ja)
Inventor
光厳 徳永
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株式会社チップトン
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Application filed by 株式会社チップトン filed Critical 株式会社チップトン
Publication of WO2023162930A1 publication Critical patent/WO2023162930A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
    • B24B31/02—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving rotary barrels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
    • B24B31/12—Accessories; Protective equipment or safety devices; Installations for exhaustion of dust or for sound absorption specially adapted for machines covered by group B24B31/00
    • B24B31/14—Abrading-bodies specially designed for tumbling apparatus, e.g. abrading-balls

Definitions

  • the present invention relates to a barrel polishing method and a cushioning material.
  • Patent Document 1 discloses a barrel polishing method in which a workpiece and polishing stones are charged into a barrel tank and the workpiece is polished.
  • barrel polishing by imparting rotational motion or vibration to a barrel tank, a relative motion difference is generated between the work and the polishing stone, and the work is polished with the polishing stone.
  • desired finishing processes such as chamfering, deburring, base treatment, and gloss improvement.
  • polishing stone polishes the workpiece, the more it wears itself out. As the wear of the polishing stone progresses, the weight of the polishing stone decreases and the pressing force against the work decreases, resulting in a decrease in the polishing force.
  • wastewater after polishing contains abrasion powder of the polishing stone, it is necessary to treat the wastewater with chemicals and filters for environmental conservation. and the number of filter replacements will increase.
  • the wear powder of the polishing stone adheres to the workpiece after polishing and becomes dirty, it is necessary to perform a cleaning process such as ultrasonic cleaning after the polishing process. , the time required for the cleaning process is increased.
  • the present invention was completed based on the above circumstances, and an object of the present invention is to reduce the wear of the polishing stone without lowering the polishing power of the polishing stone itself or increasing the cost. do.
  • the present invention A barrel polishing method in which a workpiece, a polishing stone, water, and a buffer material are placed in a barrel tank, and the workpiece is polished with the polishing stone,
  • the median diameter (D50) of the cushioning material is set to 1.2 ⁇ m to 2000 ⁇ m,
  • the amount of the cushioning material added is 2 wt % to 30 wt % with respect to the water.
  • the cushioning material exerts a cushioning effect when the workpiece collides with the grinding stone or when the grinding stones collide with each other, the grinding stones are less likely to wear. Since there is no need to adjust the composition of the polishing stone or change the process significantly, the cost does not increase. Abrasive stone wear can be reduced without increasing cost.
  • FIG. 1 A first embodiment embodying the present invention will be described below with reference to FIGS. 1 to 4.
  • FIG. 1 The barrel finishing method of Embodiment 1 is performed using a barrel tank 10 that constitutes a centrifugal barrel finishing machine (not shown).
  • a plurality of workpieces 11, a plurality of polishing stones 12, a predetermined amount of water 13, a cushioning material 14 made of powder, and a compound 15 are placed in a barrel tank 10. is put in.
  • the cushioning material 14 and the compound 15 may be charged into the barrel tank 10 separately, or the cushioning material 14 and the compound 15 may be packed together and charged into the barrel tank 10 .
  • the workpiece 11 may have a shape having at least one plane (a plane with a curvature of 0) or may have a shape having no plane.
  • An aggregate of the workpiece 11, the polishing stone 12, the water 13, the buffer material 14, and the compound 15 put into the barrel tank 10 is defined as a mass.
  • the mass is made to flow within the barrel tank 10 by revolving and rotating the barrel tank 10 .
  • the flow of mass causes a relative motion difference between the polishing stone 12 and the work 11 , and the polishing stone 12 collides with the surface of the work 11 to polish the surface of the work 11 .
  • Polishing is performed mainly for the purpose of smoothing the flat portion 11S of the workpiece 11 and curved surface portions with a small curvature, chamfering the corner portions 11E, and removing burrs.
  • the cushioning material 14 exerts a cushioning effect when the workpiece 11 collides with the grinding stones 12 or when the grinding stones 12 collide with each other, so that the abrasion of the grinding stones 12 is suppressed.
  • the material of the cushioning material 14 either an organic fiber material or a synthetic resin material is used.
  • Organic fibrous materials include wood flour, corn cobs, walnuts, peach seeds, and the like.
  • synthetic resin material styrene resin (polystyrene), urethane resin, acrylic resin, or the like can be used.
  • size of the cushioning material 14 powder with a median diameter of 1.2 ⁇ m to 0.1 mm and granules with a median diameter of 0.1 mm to 2 mm can be used.
  • the cushioning material 14 made of particles having a relatively large median diameter can be recovered and reused after polishing.
  • the cushioning material 14 made of urethane resin, which has high abrasion resistance, is preferable because it can be repeatedly collected and reused. These materials are commercially available, readily available, and relatively inexpensive in terms of cost.
  • the cushioning material 14 has a lower hardness than the polishing stone 12 and a lower hardness than the workpiece 11 .
  • the New Mohs hardness of the cushioning material 14 is preferably 5 or less.
  • the material of the cushioning material 14 is preferably elastic.
  • a material having elasticity is a material that can be elastically deformed when the cushioning material 14 is not mixed with the water 13 , and a material that is not elastically deformed when the cushioning material 14 is not mixed with the water 13 . It includes both materials that can be elastically deformed when mixed with to form a slurry.
  • the entire surface of the workpiece 11 is generally evenly polished. Therefore, when polishing is performed mainly for chamfering or deburring the corner portion 11E of the workpiece 11, the non-polishing area (flat portion 11S or curved surface portion with a small curvature) other than the corner portion 11E and the burr portion is wastefully scraped. It will be. However, according to the barrel polishing method using the cushioning material 14, the polishing amount of the non-polishing target region can be reduced as described below.
  • the cushioning materials 14 cover the non-polishing portions in a state of being densely arranged over a wide range. Therefore, when the polishing stone 12 collides with the cushioning material 14 from an oblique direction with respect to the part to be polished, the impacted cushioning material 14 is unlikely to be displaced due to the presence of the adjacent cushioning material 14. The part is easily kept covered with the cushioning material 14 . In this way, since the non-polishing target portion is likely to be held in a state covered with the cushioning material 14, polishing with the polishing stone 12 is difficult to proceed. In addition, since the shock absorbing effect of the shock absorbing material 14 is high, abrasion of the polishing stone 12 is also restrained.
  • the corners 11E and burrs which are parts to be polished in the workpiece 11, are also covered with the cushioning material 14.
  • the polishing stone 12 collides with the cushioning material 14 at the corner 11E and the burr, the cushioning material 14 is flipped off from the tip of the corner 11E and the burr, exposing the corner 11E and the burr. , the polishing stone 12 directly contacts and grinds the corner 11E and the burr. Therefore, the corner portion 11E and the burr portion are polished more than the non-polished portion.
  • the corner 11E and the burr of the work 11 are effectively polished by the polishing stone 12 in the polishing of the corner 11E and the burr. be able to.
  • the cushioning material 14 suppresses wasteful polishing of the planar portion 11S that is not to be polished and the curved surface portion with a small curvature, thereby minimizing the material loss of the work 11 and the wasteful consumption of the polishing stone 12. be able to.
  • the inventor of the present invention conducted an experiment to verify how much the type, size, and amount of cushioning material 14 used affect the amount of wear of the grinding stone 12 .
  • Table 1 shows the experimental results and verification results.
  • a centrifugal barrel finishing machine HS-1-4V manufactured by Tipton Co., Ltd. was used.
  • the capacity of the barrel tank 10 used is 1 liter.
  • the rotation speed of the barrel tank 10 is 260 rpm, and the polishing time is 30 minutes.
  • the work 11 is a 15 mm x 15 mm x 20 mm rectangular parallelepiped (see Fig. 2), and the material of the work 11 is SS400.
  • the grinding stone 12 is GT-4 manufactured by Tipton Co., Ltd.
  • the grinding stone 12 is an equilateral triangular prism with a side of 10 mm and a height of 8 mm (see FIG. 3), and the material of the grinding stone 12 is ceramics.
  • the amount of water 13 introduced into the barrel tank 10 is 0.25 liters.
  • Compound 15 is a powder compound CO-56 manufactured by Tipton Co., Ltd.
  • the input amount of the compound 15 is 1 wt % with respect to the water 13 . That is, the weight ratio of the water 13 and the compound 15 (the weight of the compound 15/the weight of the water 13) in the barrel tank 10 is 0.01.
  • the cushioning material 14 wood flour, styrene resin granular material, corn cob (cone), and acrylic resin granular material were used.
  • the input amount of the buffer material 14 represents the ratio of the input amount of the buffer material 14 to the input amount of the water 13 into the barrel tank 10 .
  • the input amount of the cushioning material 14 (the weight of the cushioning material 14/the weight of the water 13) ⁇ 100.
  • the amount of the cushioning material 14 added in the experiment was 0 to 30 wt %.
  • the wear rate is the ratio of the amount of wear after polishing to the weight of the polishing stone 12 before polishing (the difference between the weight of the polishing stone 12 before polishing and the weight after polishing/the weight of the polishing stone 12 before polishing). ).
  • the wear rate ratio is the ratio of the wear rate of each example or each comparative example (wear rate of each example or each comparative example/ Wear rate of Comparative Example A).
  • a wear rate ratio of 0.8 or less was rated as " ⁇ (particularly good)"
  • a wear rate rate of 0.9 or less was rated as " ⁇ (good)”.
  • the R amount is the measured value of the R amount of the corner 11E of the workpiece 11 (the radius of the quarter-arc portion of the corner 11E).
  • the R amount ratio is the ratio of the R amount of each example (R amount of each example/R amount of comparative example A) when the R amount of the condition without the buffer material 14 (comparative example A) is 1. be. Since the variation in the R amount ratio when there is no cushioning material 14 is about ⁇ 5%, it is judged that the R amount evaluation of the example in which the R amount ratio is larger than 0.95 is within the normal variation range. and " ⁇ (good)". Examples in which the R amount ratio was 0.95 or less were evaluated as "x (defective)" for the R amount evaluation.
  • the amount of the cushioning material 14 added is 1 wt %.
  • the wear rate evaluation is "x”.
  • the wear rate evaluation of Examples 1, 9, and 16 in which the amount of the cushioning material 14 added is 2 wt % is "Good”.
  • the wear rate evaluation of Examples 2 to 8, Examples 10 to 15, and Examples 17 to 23 in which the amount of the cushioning material 14 added is 3 wt % to 30 wt % is "excellent".
  • the wear rate evaluation of Comparative Example E in which the median diameter of the cushioning material 14 is 0.15 ⁇ m, is "x".
  • the wear rate evaluation of Examples 24 to 28 in which the median diameter of the cushioning material 14 is 1.20 ⁇ m to 10.00 ⁇ m is “ ⁇ ”.
  • the wear rate evaluation of Example 29 in which the median diameter of the cushioning material 14 is 50.00 ⁇ m is “ ⁇ ”.
  • the wear rate evaluation of Example 30 in which the median diameter of the cushioning material 14 is 2000.00 ⁇ m is " ⁇ ”.
  • Example 31 in which the amount of the cushioning material 14 added is 5 wt %
  • Example 9 in which the amount of the cushioning material 14 is added is 9 wt %.
  • the wear rate evaluation of No. 32 is " ⁇ ”.
  • the wear rate evaluation of Examples 33 to 36 in which the amount of the cushioning material 14 added is 20 wt % or more is "A”.
  • the amount of the cushioning material 14 charged is preferably 20 wt % or less.
  • the R amount evaluation of Example 4 in which the amount of the cushioning material 14 is 5 wt% and Example 5 in which the amount of the cushioning material 14 is 6 wt% is " ⁇ ".
  • the cushioning material 14 is styrene
  • the R amount evaluation of Example 11 in which the amount of the cushioning material 14 added is 4 wt % and Example 12 in which the amount of the cushioning material 14 added is 5 wt % is "Good”.
  • the cushioning material 14 is a cone
  • the R amount evaluation of Example 19 in which the amount of the cushioning material 14 is 5 wt% and Example 20 in which the amount of the cushioning material 14 is 6 wt% is "O".
  • Example 33 When the cushioning material 14 is acrylic, the R amount evaluation of Example 33 in which the amount of the cushioning material 14 added is 20 wt% and Example 34 in which the amount of the cushioning material 14 added is 28 wt% is "O".
  • Example 37 When the cushioning material 14 is acrylic, Example 37 in which the amount of the cushioning material 14 is 7 wt%, Example 38 in which the amount of the cushioning material 14 is 8 wt%, and 9 wt% are used.
  • the R amount evaluation of Example 39 is " ⁇ ".
  • the polished work 11 and the polishing stone 12 are sorted, and sludge such as polishing powder of the work 11 and wear powder of the polishing stone 12 is drained, and the inside of the barrel tank 10 is washed.
  • the median diameter of the cushioning material 14 is larger than 1000 ⁇ m, only the grinding stone 12 can be sorted out and collected by sorting means such as a sieve or a filter in the washing step. Running costs can be reduced by reusing the collected cushioning material 14 . Therefore, the median diameter of the cushioning material 14 is more preferably 1000 ⁇ m to 2000 ⁇ m.
  • the amount of the cushioning material 14 put into the barrel tank 10 is preferably 2 wt % to 30 wt %. If the amount of the cushioning material 14 added is less than 2 wt %, a sufficient cushioning effect cannot be exhibited. If the amount of the cushioning material 14 added is more than 30 wt %, the cushioning material 14 tends to remain as dirt on the work 11 after polishing.
  • a work 11, a polishing stone 12, water 13, and a buffer material 14 are put into a barrel tank 10, and the work 11 is polished with the polishing stone 12.
  • the median diameter (D50) of the cushioning material 14 is set to 1.2 ⁇ m to 2000 ⁇ m.
  • the amount of the cushioning material 14 added is set to 2 to 30 wt % with respect to the water 13 . That is, the weight ratio of the buffer material 14 to the water 13 in the barrel tank 10 (the weight of the buffer material 14/the weight of the water 13) is 0.02 to 0.30.
  • the cushioning material 14 exerts a high cushioning effect when the workpiece 11 and the grinding stone 12 collide or when the grinding stones 12 collide with each other. , the abrasive stone 12 is less likely to be worn.
  • the abrasion of the grinding stone 12 can be suppressed without reducing the grinding power of the grinding stone 12 itself.
  • the abrasion of the polishing stone 12 can be reduced without lowering the polishing power of the polishing stone 12 itself or increasing the cost.
  • the amount of the additive added to water is preferably 1 wt % to 2 wt %. Adding more than 2 wt % of the additive to water is not preferable from the viewpoint of cost because the anti-sticking effect becomes excessive.
  • the cushioning material 14 used in the barrel polishing method of the present embodiment has an input amount (addition amount) of 2 wt % or more with respect to the water 13 , unlike the additive for sticking prevention.
  • the amount of the cushioning material 14 added increases, the interference effect of the cushioning material 14 increases. Become. Therefore, considering the usage amount of the cushioning material 14, it is preferable to set the amount of the cushioning material 14 to be 20 wt % or less.
  • the amount of the cushioning material 14 added is less than 3 wt %, the effect of reducing the wear of the grinding stone 12 is low. When the amount of the cushioning material 14 added is 3 wt % or more, the effect of reducing the abrasion of the grinding stone 12 is enhanced. If the amount of the cushioning material 14 added is more than 6 wt %, the cushioning material 14 tends to remain on the corner 11E of the work 11 and the burrs without being flipped off when the abrasive stone 12 collides with it, resulting in chamfering of the corner 11E. It becomes easy to reduce the amount of burrs and the amount of burrs removed from the burrs.
  • the amount of the cushioning material 14 to be added is preferably 3 wt % to 6 wt %.
  • the compound 15 one made of a lubricating material can be used.
  • the compound 15 makes the polishing stone 12 slippery on the planar portion 11S of the work 11, so that the contact area between the work 11 and the polishing stone 12 increases. As a result, the polishing efficiency of the planar portion 11S of the workpiece 11 is improved.
  • a material made of a material that exhibits an etching function on the workpiece 11 can be used.
  • the surface of the work 11 becomes brittle and easily scraped by etching, or melts and becomes easily scraped, so polishing efficiency on the surface of the work 11 is improved.
  • the polishing efficiency on the surface of the workpiece 11 is improved by the abrasive grains.
  • the compound 15 is preferably made of a material that does not contain a fatty acid salt.
  • the buffer material 14 contains a resin component
  • the pH of the water 13 in the barrel tank 10 is lowered due to the effect of the resin component.
  • compound 15 contains a fatty acid salt
  • free fatty acids are generated from compound 15 due to the decrease in pH. Since the free fatty acid is oily, there is a concern that it will adhere to the surfaces of the workpiece 11, the polishing stone 12, and the cushioning material 14 as dirt.
  • the compound 15 containing no fatty acid salt it is possible to prevent free fatty acid stains from adhering to the surfaces of the workpiece 11, the polishing stone 12, and the cushioning material 14.
  • the polishing stone 12 preferably has a shape having a flat portion 12S, as shown in FIG. If the polishing stone 12 has a shape such as a sphere that does not have a flat portion 12S, for example, when it collides with another polishing stone 12, it always makes a point contact. It is difficult to obtain the wear reduction effect of No. 12. On the other hand, if the polishing stones 12 are shaped to have flat portions 12S, the flat portions 12S come into face contact with each other when the polishing stones 12 collide with each other. In this case, the cushioning material 14 is likely to intervene between the flat portions 12S, so the abrasion reduction effect of the polishing stone 12 is enhanced.
  • the cushioning material may be an organic fibrous material other than wood flour, corn cobs and walnuts.
  • the cushioning material may be a synthetic resin material other than styrene resin, urethane resin, and acrylic resin.
  • the cushioning material may be a material other than organic fibrous materials and synthetic resin materials.
  • the hardness of the cushioning material may be the same as that of the abrasive stone.
  • the hardness of the cushioning material may be the same as that of the workpiece.
  • the neo-Mohs hardness of the cushioning material may be higher than 5.
  • the cushioning material may be a non-elastic material.
  • the workpiece may be polished without adding compound.
  • the compound may consist of a non-lubricating material.
  • the compound may consist of a material that does not exhibit an etching function.
  • the compound may be free of abrasive grains.
  • the compound may be a material containing fatty acid salts.
  • the compound is not limited to a powdery compound, and may be a liquid compound.
  • the workpiece may have a shape that does not have a flat portion.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

La présente invention vise à réduire une usure de pierres de polissage sans entraîner une détérioration de la puissance de polissage des pierres de polissage elles-mêmes ni augmenter le coût.　Ce procédé de polissage au tonneau est un procédé pour polir une pièce (11) au moyen de pierres de polissage (12), par introduction de la pièce (11), des pierres de polissage (12), d'eau (13) et d'un matériau d'amortissement (14) dans un réservoir cylindrique (10), un diamètre médian (D50) du matériau d'amortissement (14) étant de 1,2 µm à 2000 µm, et la quantité de matériau d'amortissement (14) introduite étant de 2 % en poids à 30 % en poids par rapport à l'eau (13). Puisque le matériau d'amortissement (14) présente un effet d'amortissement lorsque la pièce (11) et les pierres de polissage (12) entrent en collision, et lorsque les pierres de polissage (12) entrent en collision les unes avec les autres, les pierres de polissage (12) sont moins susceptibles de s'user. Puisqu'il n'est pas nécessaire d'ajuster la composition des pierres de polissage (12) ou d'effectuer des changements de processus significatifs, le coût n'augmente pas. Une usure des pierres de polissage (12) peut donc être réduite sans augmenter le coût.
PCT/JP2023/006043 2022-02-28 2023-02-20 Procédé de polissage au tonneau et matériau d'amortissement WO2023162930A1 (fr)

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JP2022029161A JP2023125191A (ja) 2022-02-28 2022-02-28 バレル研磨方法及び緩衝材
JP2022-029161 2022-02-28

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WO2023162930A1 true WO2023162930A1 (fr) 2023-08-31

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01177967A (ja) * 1987-12-30 1989-07-14 Hoya Corp 無機硬質体のバレル研磨方法
JP2007528301A (ja) * 2004-03-11 2007-10-11 メムリー コーポレーション 金属部品の疲労寿命を改善する仕上処理

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01177967A (ja) * 1987-12-30 1989-07-14 Hoya Corp 無機硬質体のバレル研磨方法
JP2007528301A (ja) * 2004-03-11 2007-10-11 メムリー コーポレーション 金属部品の疲労寿命を改善する仕上処理

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