JPS5942759B2 - Blade regeneration method and device by electrolytic polishing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electropolishing method and an apparatus for remanufacturing a metal knife or the like having a complicated cutting edge line used for punching printed matter or the like.

Conventionally, the cutting edge of a cutlery has been re-polished artificially or mechanically using a grindstone or a file.

The conventional method of force-pulling does not have much of a problem in the case of knives with simple cutting edge lines, but in the case of punching knives used for punching out complex shapes such as printed matter, the cutting edge lines may become complicated. Since the curve is non-linear, mechanical polishing cannot be performed and manual polishing must be performed, which is extremely time consuming. In particular, it required skill to sharpen the edge of the blade, and not everyone could do it.

The present invention has been made in view of the above-mentioned problems.
The purpose of this is to provide a method for regenerating blades by electrolytic polishing, which can quickly and easily re-polish and re-polish the edge of a cutlery, even if it has a complicated cutting edge line, without using a whetstone or file. In addition, in providing a method for remanufacturing blades that provides a sharp edge finish and easy post-processing, it also allows for easy and quick polishing of the blade edge, and is easy to handle. To provide an apparatus for regenerating a blade by electrolytic polishing, which allows the blade to be easily immersed in an electrolytic polishing bath and pulled up.

The present invention will be explained below with reference to Examples. Figure 1 shows an iron knife 1 that is repolished by the method of the present invention, and the cutting edge line has a complicated non-linear curve with many continuous irregularities, and is used for punching printed labels, etc. It is. Therefore, when re-polishing the cutting edge 2 of this knife 1,
If done manually or mechanically, it would be very time consuming. FIG. 2 is a schematic sectional view of an embodiment of the apparatus using the method of the present invention, and FIG. 4 is a perspective view of the same as above. Inside the electrolytic polishing tank 3 is an electrolytic polishing bath 6 made of an aqueous solution of, for example, 90% phosphoric acid and 1% sulfuric acid.
A support plate 5 for supporting a cathode plate 4 made of an insulating material is arranged in a bridging manner above both sides, and is made of any insoluble metal material such as rust steel, carbon, copper, lead, etc. The cathode plate 4 is suspended by a support plate 5 and its lower part is immersed in an electrolytic polishing bath 6, and the cathode plate 4 is connected to the cathode of a DC power source E of, for example, 10 to 15V. Next, when re-polishing the cutting edge of the cutting tool 1, first, as shown in Figure 3a, the cutting edge 2 of the cutting tool 1 is worn and dull, so this dulled part Non-polished surface protection coating 7 on polished surface a side
As shown in FIG. 3b, after forming 4, the bolt 9 of the support jig 8 shown in FIG.
A support plate 5 is supported and fixed at the center of a support jig 8 by tightening its corners, and the legs 8a of the support jig 8 are arranged on both sides of the electrolytic polishing tank 3.
The cutting edge 2 of the cutter 1 is immersed in the electrolytic polishing bath 6.

Thereafter, the anode of the DC power source E is connected to the cutter 1, the cathode is connected to the cathode plate 4, and electricity is applied between the cutter 1, which is the anode, and the cathode plate 4.

When the cutter 1 made of iron is electrolytically polished at a temperature of 300C, a DC power supply voltage of 10 to 15, and a current of 0.1 to 1A/30 to 90 minutes, the blade edge 2 is coated with a protective coating. Except for the area covered in step 7, minute irregularities such as blade breakage disappeared, and a sharp cutting edge 2 appeared.

The cutting edge 2 of the blade 1 made of electrolytically polishable metals such as iron alloys (including stainless steel), aluminum and its alloys, steel and its alloys, and nickel and its alloys was also able to be regenerated under similar conditions.

By the way, the protective coating 7 is made by mixing liquid vinyl acetate, varnish, a mixture of 40% phthalic acid and 60% cellulose acetate in equal amounts of 30% each, and further mixing with 10% toluene as a solvent. Before the polishing process, apply the liquefied mixed resin solution to the non-polished surface a of the cutting edge 2 of the knife 1 and polish it at room temperature.
It is formed by air drying for about 0 minutes, and the edge of the cutting edge 2 peels off and the polishing edge has a sharp edge without any dripping.
Moreover, after the polishing process was completed, it could be easily peeled off by hand without using mechanical equipment or solvents. In FIG. 4, 10 is an operation panel section, and 11 is a main body. The operation panel section 10 contains a DC power supply E and a timer 12 for controlling electrolytic polishing time, and the main body 11 contains an electrolytic polishing tank 3. is stored. In the figure, 13 is a voltmeter, 14 is an ammeter for monitoring DC current pressure, 15 is a current value setting knob, 16 is a time setting switch for timer 12, 17 is a set and start switch, and 18 is a timer 12. The neutral side is a timer 12 setting, and the manual side is divided into a minute current (current to prevent deterioration after polishing) and a polishing current. 21 and 22 are negative and positive electrode terminals.

The timer 13 is designed to switch the power supply circuit so that a minute current flows until it is reset after time-up. In FIG. 4, the cutter 1 is attached to the support bars 1 on both inner surfaces of the main body 11.
Although it is suspended by a support rod 20 bridging between 9 and 9, a support plate 5 may also be used as shown in FIG. According to the present invention, after forming a protective coating on the non-polished surface of the cutting edge of a knife, the cutting edge of the knife is immersed in an electrolytic polishing bath, the knife is used as an anode, and a predetermined area is formed between the cutting edge and a cathode immersed in the electrolytic polishing bath. Since the cutting edge is melted and polished by applying a DC voltage for a certain period of time, it can be easily and reliably polished even in narrow areas, and is about 2 to 3 times faster than when using a mechanical polishing device such as a file. It has the effect of creating a thick and clean finish, and it also contains vinyl acetate, varnish, phthalic acid 60(f), and cellulose acetate 4.
By applying a solution prepared by mixing equal amounts of 0% mixture and drying it to form a protective resin film, there is no tainting or dripping phenomenon that occurs with adhesives, and it is especially effective against the edges of the cutting edge. Because no sagging phenomenon occurs, the blade edge can be polished sharply, and after polishing, it can be easily peeled off by hand, eliminating the need for solvents or mechanical peeling, which shortens the post-processing process. Further, in the second invention, an electrolytic polishing bath for storing an electrolytic polishing bath, a support means for removably suspending the cutter at the center, and both ends of the support means are placed to perform electropolishing. It is equipped with a holding means for bridging and supporting the supporting means on both sides above the bathtub, and a DC power source for passing a DC current between the cathode plate immersed in the electrolytic polishing bath stored in the electrolytic polishing bath and the cutter. Since the cutter can be attached to the support means outside the device, it is easy to attach the cutter, and since both ends of the support means are simply placed on the holding means, anyone can attach and remove the support means. This effect is achieved.

[Brief explanation of the drawing]

Fig. 1 is an enlarged perspective view of a cutter to be reground by the present invention, Fig. 2 is an enlarged sectional view of the main part of the apparatus according to the present invention, and Figs. FIG. 4 is a perspective view of the same embodiment as shown in FIG. , 7 is a protective coating, E is a DC power supply, and a is a non-polished surface.

Claims (1)

[Scope of Claims] 1. After forming a protective coating on the non-polished surface of the cutting edge of a knife, the cutting edge of the knife is immersed in an electrolytic polishing bath, and the knife is used as an anode, and a cathode plate immersed in the electrolytic polishing bath is connected to the knife. A method for regenerating a blade by electrolytic polishing, characterized in that a DC voltage is applied for a predetermined period of time to dissolve and polish the blade edge. 2 The protective coating is made of vinyl acetate, varnish, and phthalic acid 6.
A method for regenerating a blade by electrolytic polishing according to claim 1, characterized in that the blade is formed by coating and drying a solution obtained by mixing equal amounts of 0% cellulose acetate and a 40% mixture of cellulose acetate. 3. The method for regenerating a blade by electrolytic polishing according to claim 1, wherein an aqueous solution of 90% phosphoric acid and 1% sulfuric acid is used as the electrolytic polishing bath. 4 The density of the direct current flowing between the cathode plate and the cutter is 0.1
A method for regenerating a blade by electrolytic polishing according to claim 1, characterized in that the electrolytic polishing is set to 1 A/cm^2. 5. An electrolytic polishing bath for storing electrolytic polishing liquid, a support means for removably suspending the cutter at the center, and supporting means bridgingly supported on both sides above the electrolytic polishing bath by placing both ends of this support means. Regeneration of a blade by electropolishing, comprising: a holding means; and a DC power supply for passing a DC current between the blade and a cathode plate immersed in an electropolishing bath stored in an electropolishing bath. Device.