JPS6033920B2 - Method of plating or electrolytic processing - Google Patents

Description

[Detailed Description of the Invention] The present invention detects the processing state of plating or various electrolytic processing using electrolysis under certain set processing conditions, and performs processing according to the detected processing state. The present invention relates to a machining method that enables optimal machining by adjusting and setting machining conditions.

Conventionally, it is known that when processing molds, especially molds with complex dimensions and shapes, when plating or electrolytic processing, it is necessary to use the correct current density. There is no convenient way to detect it, change it to the correct conditions, and process it.

It is an object of the present invention to solve these problems. The outline of the present invention is as follows.

In other words, in plating, electrolytic grinding, electrolytic machining, and other electrical machining performed by energizing, a composition containing a pigment is bonded to the processed surface of the workpiece or, in the case of an electrode with a processed shape, to the processed surface. After applying electricity for a predetermined period of time for detection under pre-selected and justified processing conditions, the changes in the pigment in the composition are investigated and detected.
Determine whether the current density, relative position, spacing, shape, dimensions, etc. of the workpiece and tool or electrode, and other necessary conditions for machining can be performed as planned, and if necessary, This is a method to change the conditions to legitimate ones. In plating, when electricity is applied, the processed surface becomes negative, and as a result, the pH becomes alkaline. If the dye used is one that develops color on the alkaline side, areas that do not develop color even when energized are areas where energization is defective. By changing the sensitivity of the dye, it is possible to determine the strength of the current density. Furthermore, in electrolytic processing that utilizes anodic dissolution, negative current is applied to the electrode side, so this can be similarly determined using the dye. In order to detect on the surface to be processed, a positive current is applied and the pH becomes acidic, so similar detection can be performed by using dyes that develop or change color in acidity. The dye used is one that develops, changes color, or develops a color so as to vividly display the plus or minus range or pH even if it is a symptom. A pigment-containing composition is used by incorporating a pigment solution into a woven fabric, non-woven fabric, or foam by adsorption or adhesion, or by dispersing a mixture with a chemical substance in a thin, uniform layer. By doing so, changes in the dye during use can be accurately detected. In addition, a magnet or particles or pieces of magnetic material are mixed into the composition, and surface adhesion is completed by the adsorption force of the self-magnetic field or external magnetic field of the mixed magnet. Of course, when performing electrolytic processing in a narrow gap, simply inserting it into the gap makes it possible to detect and judge current distribution, etc. Suitable dyes used in the present invention are indicator dyes that exhibit a plus/minus change, or in other words, a color development or discoloration change due to a change in ionization state or a change in pH. Some indicators for intermediate titrations are suitable as dyes for the present invention. Although a large number of compounds are known as indicators, some of those that can be used in the present invention will be listed and exemplified. For sensitive detection, it is preferable to utilize the properties of the dyes and indicators shown in Table 1. Table 1: Examples of dyes used in the present invention FIG. 1 is an explanatory diagram of one example of plating.

FIG. 2 is an explanatory diagram illustrating an example of the case where the electrolytic processing solution is not flowed.
In FIG. 1, the mold surface of a mold 1 has a complicated shape, and the dye-containing composition 10 of the present invention is closely adhered to the processed surface.

When the plating solution 2 is poured and the circuit leading to the power supply 5 is closed, the workpiece 1 is energized with a negative current, and the electrode 3 is energized with a positive current through the electric path 4, so that a current flows. After electricity is applied for a predetermined period of time for detection, if the electrode position or current density is correct, the electrolytic current flows uniformly over the surface of the composition 10, and the negative electrode side becomes uniformly alkaline. If phenolphthalein is used as the dye, the fence will be 8.3 to 10.0.
appears red, confirming that the conditions were valid. If you want to detect even more minute changes, you can use neutral red to detect even small changes in current density. If there is a tube where phenolphthalein does not turn red, this indicates that no current was passed through that tube. In such a case, the plating conditions are changed so that plating can be performed under uniform conditions. In the figure, multiple electrodes are used in parallel, so the degree of insertion, spacing, etc. of each electrode is adjusted, and the current flow to each electrode is adjusted using a shunt resistor (not shown) to ensure even lightning current flow. control the flow. FIG. 2 can also be used to detect the relative relationship between the electrolytic processing tool and the workpiece before flowing the liquid as in this example. In this case, when the electric path leading to the power source 5 is closed, the positive power is connected to the workpiece 1 and the negative power is connected to the processing tool 8. When the dye-containing composition 10 is tightly adhered to the processed surface, electricity is passed between the processing odor 8 and the processed surface, and the processed surface, which is a positive electrode, becomes an acidic atmosphere. If Composition 101 contains acidic discoloration, for example methyl red, the dye will turn red when energized, provided the composition has a suitable level of humidity. It can be detected that the tubes that do not change color are not energized. If the relative position of the tools is inappropriate, you can adjust them in 6 directions left and right or 7 directions up and down and check again. In the above case, in addition to the pigment-containing composition, the gap between the tool and the workpiece is filled with an electrolytic solution as needed to maintain the tool in a water-dissolved state so that electricity can be easily applied. Of course, depending on the electrolyte used, it can change greatly from neutral to acidic, from neutral to alkaline, or from acidic to alkaline, and vice versa, depending on the electrolyte used. It is preferable to select and use a material that develops or changes color optimally depending on the processing mode, that is, the conductivity, or a mixture of several kinds. When the dye-containing composition is applied to the electrode tool 8 in the electrolytic processing shown in FIG. 2, the composition 10 shown in FIG. 1 can also be used. Although the dyes used in the present invention are exemplified in Table 1, all similar color-changing dyes not listed in the table can be used, but they are selected by checking the pH color change depending on the purpose.

Also, mixing magnetic powder into the composition to cause magnetic adsorption;
Further, various embodiments may be mentioned, such as mixing with an adhesive or applying and bonding. As described above, in electrical processing such as plating or electrolytic processing, the present invention interposes a pigment-containing composition that exhibits a certain color depending on the ion concentration within a certain range in the gap between the workpiece and the electrode prior to processing, and also provides a detection method. For this purpose, current is applied between the two for a predetermined period of time, and the degree of discoloration in each part of the gap machined surface of the intervening composition is individually detected in advance, thereby determining the state of energization processing based on the relative positional relationship between the workpiece and the electrode. The current density and current value at each part of the machining surface, the relative position of the electrode to be processed, the supply jet of electrolyte, etc. can be adjusted and set in advance so that machining can be performed that more closely matches the purpose. This is what I did.

The plating method or the electrolytic processing method using the detection method of the present invention is able to accurately detect the suitability of processing conditions such as the relative position of the electrode or electrolytic processing odor and the processing surface of the workpiece, or the current density. processing, and
Helps determine legal conditions prior to processing. Accurate and highly accurate machined surfaces can be reasonably obtained. The present invention can be expected to improve processing workability and processing efficiency.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of one embodiment of plating. FIG. 2 is an explanatory diagram illustrating an example of relative positioning between a tool and a workpiece during electrolytic machining. 1... Workpiece, negative (minus) pole, 2... plating solution, 3... electrode, positive (plus) pole, 5... power supply, DC power supply,
6... Left and right direction, 7... Up and down direction, 8...
. . . Electrolytic processing tool, positive electrode, 9 . . . Void, discharge gap, 10 . . . Composition containing a pigment. Figure 1 Figure 2

Claims (1)

[Scope of Claims] 1. A pigment-containing composition that exhibits a certain color depending on the ion concentration within a certain range is interposed on the processing surface of a workpiece to be plated or electrolytically processed, and predetermined processing conditions are applied. plating or plating characterized by carrying out energization according to the method, determining the energization state of each part of the processed surface based on the state of discoloration of each part of the intervening composition, adjusting the set processing conditions according to the determination, and performing electrolysis. Method of electrolytic processing. 2. The dye-containing composition is interposed on the processed surface by a woven fabric, non-woven fabric, foam, powder or granular material impregnated with the dye, or a thin film-like material of a mixture of a chemical substance and a dye. A method of plating or electrolytic processing according to claim 1, characterized in that: 3. The method of plating or electrolytic processing according to claim 1, wherein the pigment-containing composition contains powder or pieces of a magnet or magnetic material.