JPS63229262A - Barrel polishing method usable jointly with chemical polishing - Google Patents

Abstract

PURPOSE:To improve polishing efficiency as for the barrel polishing of a stainless steel work by using as a compound a chemical polisher mixed at a predetermined ratio with hydrochloric acid, sulfuric acid and hydrogen peroxide. CONSTITUTION:As for the barrel polisher of a rotary type or a centrifugal fluid type or a swing type or the like, the chemical polisher of a hydrochloric acid-sulfuric acid-hydrogen peroxide strain is used as a compound for the barrel polishing of a stainless steel work. In this case, the content of hydrochloric acid is 10-80g/l and the content of hydrogen peroxide is 1-10g/l, and moreover, the density of hydrochloric acid to hydrogen peroxide is in the range of 3-40 at a mol ratio which is considered effective. Also, the content of sulfuric acid is 10-60g/l and moreover, the density of hydrochloric acid to sulfuric acid is in the range of 2-30 at a mol ratio which is considered adequate. By the use of this compound, the surface of the work is efficiently polished by means of mechanical polishing and at the same time, can be polished with high precision by means of chemical polishing, and moreover, the polishing of a recessed portion and a holed portion, which are out of reach for mechanical polishing, is conducted, and the whole surface can be polished evenly.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is a barrel polishing method using a chemical abrasive to polish a workpiece, and is used in an industrial field related to barrel polishing.

(Prior art) Conventionally, as one of the effective means for finishing the surface of various metal workpieces, a rotating grinding tank was charged with abrasive material, water, and compound (hereinafter collectively referred to as "mass") along with the workpiece. Barrel polishing methods are known in which workpieces are polished by applying motion such as centrifugal flow, oscillating motion, or fiA motion.
For example, various barrel polishing methods have been developed and put into practical use, including rotary, centrifugal flow, rocking, vibration, reciprocating, and gyro methods.

This barrel polishing method is called mass polishing, and has seen remarkable progress due to its high processing efficiency, but it is desired to further improve processing efficiency and improve polishing of recesses and holes that are difficult to hit with abrasive materials. .

In addition, chemical polishing, in which workpieces are immersed in a bath containing specific acids, bases, and their salts to smooth them, does not require special equipment and is relatively simple and can polish workpieces with complex shapes uniformly and in a short time. It has the advantage of being able to be polished.

(Problems to be Solved by the Invention) Conventionally, typical chemical abrasives for immersion treatment of stainless steel are mainly phosphoric acid-nitric acid monohydrochloric acid and nitric acid-hydrochloric acid monosulfuric acid monofluoric acid mixed solutions, and none of them are commercially available. As a product -56
6. Chemilite #55 (manufactured by Japan Surface Chemical Co., Ltd.), R
9-69 (manufactured by Gosbel Kako Co., Ltd.), Clean Bright S#200 (manufactured by Rin Kagaku Kogyo Co., Ltd.), etc. have been put into practical use, but the surface condition of the workpiece, the degree of surface targeting, and the processing capacity of the workpiece There are limitations in polishing liquid composition and concentration that govern the metal dissolution reaction, surface area of the workpiece, immersion time, liquid temperature control between 60°C and 95°C, and wastewater treatment. Compared to polishing, there was a problem in that large particles could not be removed. In addition, plate-shaped workpieces are in close contact with each other, making it difficult to polish them uniformly, resulting in a roughened surface. Furthermore, if the commercial products mentioned above contain phosphoric acid or nitric acid as their main ingredients, eutrophication of water quality due to wastewater becomes a problem, and if they contain nitric acid or hydrofluoric acid, measures are required to prevent pollution of the working environment due to exhaust gas. There were problems such as

(Means to Solve the Problem) However, the present invention uses an inorganic acid excluding phosphoric acid, nitric acid, and hydrofluoric acid and hydrogen peroxide-based chemical polishing agent as a compound for barrel polishing, thereby improving the conventional barrel polishing and chemical polishing. This corrects the drawbacks of polishing and dramatically improves the efficiency of barrel polishing.

In other words, the barrel polishing machine of the present invention can be any of the rotary type, centrifugal flow type, rocking type, vibration type, reciprocating type, and gyro type, but as the chemical polishing agent is consumed, it is difficult to add new liquid or react. The open vibrating barrel is most suitable for dispersing and removing heat, for fully automatic continuous loading and unloading of workpieces, and for providing an excellent glossy finish with no dents on the workpiece.

As for the type of abrasive, any of the conventionally used ones for target finishing, semi-finishing, and gloss finishing can be used, and it can be selected depending on the surface condition of the workpiece and the purpose of polishing.

The inventors of the present invention conducted research on non-polluting inorganic acids, organic acids, bases, and salts, and found that a mixed system of hydrochloric acid, wt acid, and hydrogen peroxide is particularly effective in improving polishing speed and surface precision. Furthermore, it has been found that when an organic acid is used in combination with the hydrochloric acid-sulfuric acid monohydrogen peroxide system, there is a significant synergistic effect on improving the amount of polishing.

That is, the surface treatment of the stainless steel workpiece can be selected depending on the concentration of hydrochloric acid in the hydrochloric acid-sulfuric acid monohydrogen peroxide chemical polishing agent, the molar ratio of hydrochloric acid to hydrogen peroxide, and the molar ratio of hydrochloric acid to sulfuric acid.

The content of hydrochloric acid is 10g# to 80g/l, the content of hydrogen peroxide is 1/J to 10(1/l), and the molar ratio of the concentration of hydrochloric acid to hydrogen peroxide is in the range of 3 to 40. It is valid.

Below this range, the polishing efficiency decreases, and above this range, the amount of polishing increases, but the surface of the workpiece becomes rough and the gloss level decreases.

The content of sulfuric acid is 10g/j! ~600# and hydrochloric acid vs. 1i1! The acid concentration is suitably in the range of 2 to 30 in terms of molar ratio. Below this range, the workpiece surface becomes rough, and above this range, the polishing efficiency decreases.

Examples of organic acids that can be used in combination with hydrochloric acid-sulfuric acid hydrogen monoperoxide chemical polishing agents include dicarboxylic acids such as oxalic acid, succinic acid, and maleic acid, and oxyacids such as tartaric acid and citric acid, which do not impede the smoothness of the workpiece. polishing speed can be increased. In addition, nonionic surfactants such as ether type and alkylphenol type can be used as surfactants in the above system.

The barrel wastewater according to the present invention does not contain hexavalent chromium, and can be easily separated from heavy metals by adding an alkali agent and a lithium collector in the same way as normal barrel wastewater.

The workpiece after barrel polishing as described above exhibits a silvery white metallic luster, but if it is further polished to a glossy finish by ordinary barrel polishing for a long time, it is possible to impart better gloss and smoothness.

(Function) According to the polishing method of the present invention, mechanical polishing and chemical polishing proceed simultaneously, so that the surface of the workpiece can be efficiently polished by mechanical polishing. In addition to iJI polishing, the surface is chemically polished to a higher degree of precision, and recesses and holes that cannot be polished by mechanical polishing are chemically polished, making it possible to uniformly polish the entire surface, resulting in a mass By stirring the chemical polishing liquid by the flow of the chemical polishing liquid, the effect of chemical polishing can be further activated.

(Example 1) A stainless steel 5US304 (18Cr-8Ni) test piece, a polishing stone 3P-8 made by Tipton Co., Ltd., and a chemical polishing liquid were charged into various barrel polishing tanks made by Tipton Co., Ltd. The polishing situation was observed based on the specifications.

Table 1 Test piece: Dimensions 28φ×8+ll! , weight 38g, #80
A predetermined amount of the zero-vapor finish chemical polishing agent was weighed out, diluted and dissolved in water to form the polishing liquid star, and charged into each barrel tank. Glossiness was measured using a Suga Test Instruments Co., Ltd. gloss meter UGV-5D at a light incident angle of 20° and a black glass primary work standard plate of 85.2X1/6.
Measured using.

In the control example (barrel polishing only), the compound LC-NZ manufactured by Tipton Co., Ltd. was used instead of the chemical polishing solution, and in the case of the chemical polishing solution immersion only, the test piece was placed in chemical polishing solution 11 under stirring. I did it by hanging it.

In the example (Table 2), when using the hydrochloric acid-sulfuric acid monohydrogen peroxide system, compared to <barrel polishing only>, the centrifugal flow type was approximately 13
~17 times, rotating type approx. 15-45 times, vibration type approx. 4-5 times
8x and sharpen! The amount was improved, and the surface roughness and gloss were generally good.

In the comparative example (Table 3), using a hydrochloric acid-sulfuric acid monohydrogen peroxide system, if the mixture composition and concentration were outside the above range, the amount of polishing would be comparatively small, or the surface would become rough, making it unusable. . Furthermore, in the case of hydrochloric acid-nitric acid type (3:1 volume ratio) and phosphoric acid-octacid type compositions, the polishing performance was poor due to less amount of polishing FF3X or rougher surface compared to the examples.

If only immersed in a chemical polishing solution, smut will occur and the surface will become extremely rough.

It was insufficient and deformation of the workpiece was observed.

(Effects) As described above, according to the present invention, by using a hydrochloric acid-sulfuric acid monohydrogen peroxide-based chemical polishing agent as a barrel polishing compound, the polishing efficiency of stainless steel workpieces can be significantly improved. We were able to solve the problems of conventional barrel polishing and chemical polishing.

In addition, according to the present invention, the synergistic effect of chemical polishing and mechanical polishing can significantly shorten the polishing time, reduce the amount of abrasive wear, and reduce the amount of abrasive used, resulting in rough finishing, semi-finishing, glossy finishing, etc. Various effects were obtained, such as saving some labor in the polishing process, suppressing the occurrence of deformation and distortion of the workpiece, and also making it possible to polish minute recesses and holes that are impossible with mechanical polishing. .

Claims (1)

[Claims] 1. A barrel polishing method that combines chemical polishing, characterized in that a stainless steel workpiece is barrel polished using a chemical polishing compound containing hydrochloric acid, sulfuric acid, and hydrogen peroxide. 2. The chemical polishing agent is hydrochloric acid. The content of 10g/l~80g
/l, the content of sulfuric acid is 10 g/l to 60 g/l, the content of hydrogen peroxide is 1 g/l to 10 g/l, the molar ratio of hydrochloric acid to hydrogen peroxide is in the range of 3 to 40, and Barrel polishing method 3 combined with chemical polishing according to claim 1, in which the molar ratio of sulfuric acid to sulfuric acid is in the range of 2 to 30. Stainless steel is prepared by using a chemical polishing agent mixed with hydrochloric acid, sulfuric acid, hydrogen peroxide, and an organic acid as a compound. Barrel polishing method combined with chemical polishing characterized by barrel polishing a steel workpiece 4 Claims in which the organic acid is a dicarboxylic acid such as oxalic acid, succinic acid, or maleic acid, or an oxyacid such as tartaric acid or citric acid Barrel polishing method combined with chemical polishing described in Section 3