WO2009043207A1 - Producing method for grater - Google Patents

Abstract

A producing method for grater includes: coating etching resistant layers (2, 3) with etching openings (5, 6) on the front surface and the rear surface of a metal plate (1), the opening (6) on the rear surface being larger than the opening (5) on the front surface, etching liquid attacking the metal plate (1) via the etching opening (6) on the rear surface and corroding towards the etching opening (5) on the front surface without pressure, thereby etching the exposed area in the etching opening (5, 6), then, forming a sharp edge (7) near the front surface and a curved surface along the discharging direction. The edge of the grater produced by said method is sharp, and cutting is smooth.

Description

 Method for manufacturing scraping knife

 The present invention relates to a method of making a plurality of scraping blades on a thin sheet of metal. Background technique

 Cut the block, stem and fruit into silk, slices, or scrape the cheese and chocolate into a velvet shape, often using a scraping knife (scraping knife). The scraping blade is a plurality of cutting edges protruding from a thin metal plate, and is scraped, for example, by a scraping object on the front surface of the metal plate. The edge protruding from the surface of the plate is cut into a wire and a piece by the scraping material, and is discharged from the rear surface of the metal plate.

 The traditional method of making a scraping blade is to stamp a thin metal plate to form a plurality of protruding edges. The knife edge formed by stamping cannot form a sharp edge, and metal burrs remain on the edge of the knife edge. It is difficult for the scraping blade thus produced to continuously scrape the well-formed wire or sheet, and it is easy to cause the blade to be clogged. In addition, in order to prevent the scraping knife from rusting and contaminating the food, the scraping knife is now mostly made of a thin stainless steel plate, and the toughness of the stainless steel is very good, and the press forming process is difficult.

 The existing chemical etching method is to make a scraping knife, which is covered with a corrosion-resistant protective layer on a thin metal plate, and a window with a plurality of required shapes is opened on the protective layer, and the metal plate is washed or soaked with a chemical etching solution, and the window is opened and exposed. The metal is corroded to form the desired blade shape, and the blade is protruded to form a scraping blade. U.S. Patent No. 5,100,506 discloses several methods of making a scraping blade by chemical etching. As shown in Figures 1-6, the icon 1 is a metal plate, the icon 2 is a front surface protective layer, and the icon 3 is a rear surface protective layer. Icon 4 is an etching spray, icon 5 indicates an etching window on the front surface, icon 6 indicates an etching window on the rear surface, icon 7 indicates a blade edge formed by etching, icon 8 indicates a knife base of the blade, and icon 9 indicates a knife. Follow (higher the root of the blade).

In the etching method illustrated in FIG. 1, the lower surface of the metal plate is provided with a corrosion-resistant protective layer, and the etching windows of the protective layers on both sides are correspondingly overlapped, and the etching liquid simultaneously etches the metal plate from both sides. After etching, the formed blade shape is as follows. As shown in Fig. 2, a middle portion of the cross section of the sheet material forms a cutting edge 7, which has a small protrusion and is not sharp, and forms a knife base 8 on both sides of the cutting edge. The surface of the knife base is almost the cross section of the sheet, such a scraping knife cannot Forming a sharp edge, and the surface of the knife base will hinder the discharge, which will cause blockage during scraping and scrape out The material is not well formed.

 The method shown in FIG. 3 is to cover the protective layer on one side of the thin metal plate, and an etching window is opened thereon, and the metal plate is etched from one side of the window. After the etching, the shape of the blade formed is as shown in FIG. 4 . It still cannot form a sharp cutting edge, and a curved surface which is curved in the direction of the discharge is formed at the base of the knife. The object to be cut is blocked and squeezed at the curved portion of the curved surface, which still causes the discharge to be unsmooth and difficult to continue. Obtaining a perfectly shaped wire or piece of paper can still block the tool.

 The method shown in FIG. 5 is to cover the protective layer on both sides of the metal plate, but only the back surface protective layer has an etching window, and the front surface is absent. The etching liquid corrodes the metal plate from the rear surface, and the metal plate is corroded on one side. The other side has a protective layer, which can form a relatively good cutting edge, but the curved surface of the knife base is still curved in the direction of the discharge. As shown in Fig. 6, the curved surface still hinders the discharge, so it is still difficult to obtain continuously. The wire or piece with good shape is formed on the surface of the metal plate by the blade edge. There is no inclination angle at the upper surface of the blade, which is not conducive to the separation of the wire, the piece and the body cut on the workpiece. Summary of the invention

 SUMMARY OF THE INVENTION The present invention is directed to a method of making a scraping blade for obtaining a sharp scraping blade and ensuring a smooth discharge, which allows the workpiece to be continuously cut into a well-formed wire or sheet.

 The method for manufacturing the scraping blade according to the present invention has the following steps:

a covering the front and back of the thin metal plate with an anti-etching protective layer;

b. The protective layer on both sides of the metal plate opens a corresponding etching window according to the required blade shape, and the etching window of the rear surface of the metal plate is offset from the etching window of the front surface, that is, the etching surface of the rear surface is ensured to be larger than the front surface The etching window is widened on the root side;

c using an etching solution capable of etching metal to impact the metal plate at the rear window, the randomly flowing etching liquid wets the front window under no pressure, and the metal exposed in the etching window is etched to form a shape of the knife; d Remove the protective layer and clean the metal sheet;

e. Press the metal plate with a mold to make the edge of the etched knife protrude from the metal plate surface.

According to the manufacturing method of the scraping blade of the present invention, since the etching window on both sides of the metal plate is displaced, and the rear window is larger than the front window on the side of the blade, the etching liquid is impacted under pressure in the etching process. The metal exposed to the rear window allows the back surface to be etched faster, while the front surface is infiltrated by the non-pressure etchant and etches slowly. After etching, a sharp portion is formed near the front surface of the metal section. Blade, and the blade is forward The surface has an angle of inclination, which facilitates the separation of the cut wire and the piece from the body. In addition, due to the misalignment of the front and rear etching windows, the blade base is long and forms a curved surface in the direction of cutting and discharging, which makes the cutting smoother. The scraping blade manufactured by the present invention has a sharp blade edge, is labor-saving and smooth, and can continuously cut the workpiece into a well-formed wire or sheet. DRAWINGS

Figure 1 is a schematic view of a chemical etching method for making a doctor blade;

Figure 2 is a schematic view showing the shape of the product obtained in the manner of Figure 1;

Figure 3 is a schematic view showing another chemical etching method for making a scraping blade;

Figure 4 is a schematic view showing the shape of the product obtained in the manner of Figure 3;

Figure 5 is a schematic view showing another chemical etching method for making a scraping blade;

Figure 6 is a schematic view showing the shape of the product obtained in the manner of Figure 5;

7 and FIG. 8 are schematic views showing a method of manufacturing a scraping blade according to Embodiment 1 of the present invention;

Figure 9 is a schematic view showing the shape of the product obtained by the method of Figure 7 and Figure 8;

Figure 10 is a partial enlarged view of the blade edge portion of Figure 9. detailed description

Example 1

 The manufacturing method of the scraping blade provided in this embodiment, as shown in FIGS. 7, 8, and 9, includes the following steps: a. covering the front and back sides of the thin metal plate 1 with the anti-corrosion protective layers 2, 3; on the surface of the clean and dry thin metal plate Applying a photosensitive ink to the surface, and drying the ink on the surface of the sheet with an oven;

b. The protective layer ink on both sides of the metal plate is opened according to the development, fixing, and exposing procedures in the prior art. The corresponding etching window 5, 6, the etching window 6 behind the metal plate and the front etching The window 5 is misaligned, that is, the post-etching window is widened on the side of the root 9 than the front etching window;

c etching the metal plate through the nozzle pressure spray 4 at the rear window by using an etching solution capable of etching the metal, and the randomly flowing etching liquid wets the front window under a pressureless state, and the etching liquid capable of etching the metal is present There are chemical etching solutions commonly used in the art, which include 70%-80% of ferric chloride, 10%-20% of hydrochloric acid, 2%-4% of water, and 1%-2% of nitric acid exposed in the etching window. The metal is corroded to form the shape of the knife;

眷 PAGE (fine <? 26: d. remove the protective layer and clean the metal plate;

e. Press the metal plate with a mold to make the etched blade protrude from the metal plate surface.

 The manufacturing method of the scraping blade according to the embodiment is as shown in FIG. 7, FIG. 8, and FIG. 9, because the etching window on both sides of the metal plate is misaligned, and the side of the blade 9 of the rear window is larger than the front window. In the etching process, the chemical etching solution impacts the metal exposed to the rear window under pressure, so that the back surface is corroded faster, and the front surface is corroded by the non-pressure corrosive liquid, and the corrosion is slower after the entire corrosion. The metal section forms a sharp edge near the front surface, and the blade has a dip angle of 10 to the front surface (the inclination angle is about 0.03 mra), which facilitates the separation of the cut wire and the piece from the body. In addition, due to the misalignment of the front and rear windows, a long and smooth cutting of the base of the arc in the direction of the material is formed, which makes the cutting smoother. The scraping blade manufactured by the present invention has a sharp blade edge, is labor-saving and smooth, and allows the workpiece to be continuously cut into a well-formed wire or sheet.

 It should be noted that, in the above step b, the condition is satisfied (the etching window 6 behind the metal plate is displaced from the front etching window 5, that is, the front etching surface of the front etching window is widened on the side of the root 9). The size of the etched window can be the same or different, such as: The back surface etch window can completely cover the front surface etch window on the front surface. Example 2

 The manufacturing method of the scraping blade provided in this embodiment, wherein the c step is: placing a metal plate in an electrolytic cell, the metal plate is connected with the positive electrode of the direct current power source as an electrolytic anode, and the etching liquid capable of etching the metal is an electrolytic solution. The electrolyte impacts the metal plate at the rear window, and the randomly flowing etching liquid wets the front window in a pressureless state, and the metal exposed to the etching window is electrolyzed to form a shape of a knife, and the rest is the same as in the first embodiment.

Wherein, the electrolyte may be a common electrolyte such as NaCl, C1, Na ₂ SO ₄ or the like.

 In this embodiment, a non-toxic and harmless electrolyte is used to replace the highly corrosive, volatile harmful acidic corrosive liquid, which is harmless to the human body and has no pollution to the environment.

Example 3

 The manufacturing method of the scraping blade provided by the embodiment, wherein the anti-corrosion protective layer with the etching window described in steps a and b directly prints a layer of anti-etching ink layer with a window on the metal plate through the printing machine. The rest is the same as in the second embodiment. This method makes the process simpler, faster, and has a higher yield and greatly lowers the cost.

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Claims

 Claim  A method for manufacturing a scraping knife, comprising the steps of:  a. covering the front and back surfaces of the thin metal plate with an anti-etching protective layer;  b. On the protective layer on the front and back surfaces of the metal plate, a corresponding etching window is opened according to the required blade shape, and the etching window on the rear surface of the metal plate is misaligned with the etching window of the front surface, that is, the back surface etching is ensured. The window is wider than the front surface etching window on the root side;  c etching the metal plate at the etching surface of the back surface with an etching solution capable of etching the metal, and the randomly flowing etching liquid wets the etching window of the front surface in a pressureless state, and the metal exposed in the etching window is etched. Forming the shape of the knife;  d. Remove the protective layer and clean the metal plate;  e. Press the metal plate with a mold to make the etched blade protrude from the metal plate surface.  The method for manufacturing a scraping blade according to claim 1, wherein the step c is: placing a metal plate in an electrolytic cell, and electrically connecting the two poles of the direct current power source to the metal plate and the electrolytic cell for electrolysis. The liquid, the etching solution capable of etching the metal is an electrolyte, the electrolyte impacts the metal plate at the rear window, the randomly flowing electrolyte infiltrates the front window under no pressure, and the metal exposed in the etching window is electrolyzed, 'forming The shape of the knife.  The method of manufacturing a scraping blade according to claim 1, wherein the etching resistant layer having an etching window is printed by directly etching a layer of anti-etching ink having a window on the metal plate. Layered.  The method of manufacturing a scraping blade according to claim 1, wherein the protective layer corresponds to an etching window having the same size. The method of manufacturing a scraping blade according to claim 1, wherein the etching of the back surface of the anti-etching protective layer on the front surface completely covers the front surface etching window. Replace page 4,