Shaving blade and method for manufacturing the same

Abstract

The shaving blade includes a blade body (1) and a plurality of cutting teeth (2) spaced apart on the blade body (1). A cutting groove (3) is formed between two adjacent cutting teeth (2), and the wall surface of the cutting groove (3) is a continuous curved surface extending from the lower end surface of the cutting tooth toward the upper end surface of the cutting tooth. Because stress is less likely to concentrate on the wall surface of the shaving blade, it does not affect the rigidity of the overall structure, and deformation during cutting, unshaved areas, and temperature rise can be effectively reduced. Furthermore, during heat treatment, the continuous curved surface receives heat more uniformly when heated, and temperature changes are more uniform when cooled, making it less prone to deformation during heat treatment and effectively solving the problem of the low reliability of the side walls of conventional cutting teeth. A method for manufacturing a shaving blade in which a plurality of cutting teeth are formed by cutting with a cutting wheel (4) having a diameter of 80 mm or less is further disclosed.

Description

Technical Field

[0001] [Cross-reference to Related Applications] This application claims the priority of a Chinese patent application with the application number 202310790653.3 and the invention title "Shaving Blade and Its Manufacturing Method", which was filed with the China National Intellectual Property Administration on June 29, 2023, and all of its contents are incorporated herein by reference.

[0002] This application relates to the technical field of shaving blades, and particularly to shaving blades and their manufacturing methods.

Background Art

[0003] A shaving blade is the main operating part of a beard trimmer or a razor. Conventional beard trimmers or razors mainly include two types: rotary and reciprocating. As the shaving blade rotates or swings in the head part of the beard trimmer or razor, the shaving blade moves relative to the fixed net blade, and the hair that enters between the shaving blade and the fixed net blade is cut. Usually, a plurality of cutting teeth are installed at intervals on the cutting end of the shaving blade, and the reliability of the cutting teeth during hair cutting affects the hair cutting effect.

[0004] Currently, the side wall of a conventional cutting tooth is usually formed by connecting a plurality of wall surfaces. The side wall of the cutting tooth is the side wall of the cutting groove. When the side wall of the cutting tooth extends from bottom to top along the vertical direction, the side wall of the cutting tooth is usually formed by connecting a plurality of planes with different angles, or the side wall of the cutting tooth is formed by connecting a curved surface and a plane. Due to the sudden change in the angle at the connection point of two adjacent surfaces, stress concentration occurs at the connection point of two adjacent surfaces when the cutting tooth is in use, which affects the rigidity of the structure and easily causes problems such as deformation, missed shaving, and temperature increase. In addition, the side wall with such a structure is prone to deformation due to uneven heat reception during the heat treatment step in the manufacturing process. Therefore, the side wall of the conventional cutting tooth also has the problem of low reliability.

Summary of the Invention

[0005] In view of this, the present invention provides a shaving blade and a method for manufacturing the same in order to solve the problem of the low reliability of the side walls of conventional cutting teeth.

[0006] According to the first embodiment, the shaving blade of the present invention includes a blade body and a plurality of cutting teeth spaced apart on the blade body, wherein a cutting groove is formed between two adjacent cutting teeth, and the wall surface of the cutting groove is a continuous curved surface formed extending from the lower end surface of the cutting tooth toward the upper end surface of the cutting tooth.

[0007] In a preferred embodiment, the wall surface of the cutting groove is a plurality of continuous arcuate surfaces.

[0008] In a preferred embodiment, a cutting edge is formed at the intersection of the wall surface of the cutting groove and the lower end surface of the cutting tooth. The angle between the tangent to any point on the cutting edge and the lower end surface is the cutting angle. A plane perpendicular to the wall surface of the cutting groove and the lower end surface intersects to form a tooth groove line. To ensure that the cutting tooth has an appropriate thickness and good cutting performance, the inclination of each point on the tooth groove line relative to the lower end surface gradually increases along the direction away from the cutting edge.

[0009] In a preferred embodiment, the cutting angles corresponding to any point on the blade edge are all less than 75°.

[0010] In a preferred embodiment, the direction from the opening of the cutting groove toward the bottom of the cutting groove is a first direction, and the cutting angle corresponding to each point on the blade edge changes continuously along the first direction.

[0011] In a preferred embodiment, the cutting angle corresponding to each point on the blade edge gradually decreases along a first direction, or the cutting angle corresponding to each point on the blade edge first gradually decreases along a first direction and then gradually increases.

[0012] In a preferred embodiment, the blade edge is a continuous curve.

[0013] According to the second aspect, the method for manufacturing the razor blade for manufacturing the razor blade described above, The process includes the steps of creating a blade body and cutting the blade body with a cutting wheel to form cutting teeth, wherein the diameter of the cutting wheel is 80 mm or less, a cutting groove is formed between two adjacent cutting teeth, and the wall surface of the cutting groove is a continuous curved surface that extends from the lower end surface of the cutting tooth toward the upper end surface of the cutting tooth.

[0014] In a preferred embodiment, in the step of forming cutting teeth by cutting the blade body with a cutting wheel, The cutting wheel cuts the blade body to form cutting grooves, forming cutting teeth between any two adjacent cutting grooves, the cutting wheel is fed from the bottom of the cutting groove to the opening of the cutting groove, the cutting wheel tilts toward the lower end of the cutting teeth during the feeding process, and / or the rotational speed of the cutting wheel is 3000 r / min to 5000 r / min, and the cutting feed rate of the cutting wheel is 0.1 mm / min to 10 mm / min.

[0015] In a preferred embodiment, the step of making the blade body is: The process includes the steps of preparing a blank and processing the blank to match the external dimensions of the blade body to form the blade body.

[0016] In a preferred embodiment, the step of preparing the blank is: The process includes the steps of: obtaining the hardness of a blank; forming a blade body using the blank if the hardness of the blank is equal to or greater than a predetermined hardness; and heat-treating the blank to form a blade body if the hardness of the blank is less than a predetermined hardness.

[0017] In a preferred embodiment, if the hardness of the blank is less than a predetermined hardness, the step of heat-treating the blank is: The process includes the steps of: placing a blank into a heat treatment apparatus and heat-treating the blank with the heat treatment apparatus, wherein the heat treatment temperature range is 850°C to 1300°C and the holding time is 30 minutes or more; and cooling the blank to a predetermined temperature range of room temperature to 65°C, and then removing it from the heat treatment apparatus.

[0018] In a preferred embodiment, after the step of cutting the blade body with a cutting wheel to form cutting teeth, The method further includes polishing the surface of the cutting teeth so that the flatness and surface roughness of the cutting teeth reach predetermined levels of flatness and surface roughness. [Effects of the Invention]

[0019] 1. The wall surface of the cutting groove is a continuous curved surface that extends from the lower end surface to the upper end surface of the cutting tooth. Compared to cases where the wall surface of the cutting groove is formed by connecting multiple planes or by connecting a curved surface and a plane, stress is less likely to concentrate on the wall surface of this structure. Therefore, it does not affect the rigidity of the overall structure, and deformation, uncut material, and temperature rise during cutting can be effectively reduced. Furthermore, during heat treatment, the continuous curved surface receives heat more uniformly when heated, and the temperature change during cooling is more uniform, making it less prone to deformation during heat treatment. This effectively solves the problem of low reliability of the side walls of conventional cutting teeth.

[0020] 2. By setting the inclination of the tooth groove to gradually increase as it moves away from the blade edge, and decreasing inclination in the portion of the tooth groove close to the blade edge, the blade edge becomes sharper, and as the cutting tooth extends from the bottom to the top, the tooth width of the cutting tooth changes non-linearly, and the decrease in tooth width is more gradual, so the side walls of the cutting tooth do not cross prematurely, the tooth width of the middle and upper part of the cutting tooth becomes wider, and the overall tooth thickness becomes larger, thus increasing the overall rigidity of the cutting tooth. This makes it possible to make the cutting angle of the cutting tooth very small, while guaranteeing the rigidity of the cutting tooth, and effectively solves the problem that conventional shaving blades have difficulty achieving both sharpness and rigidity.

[0021] 3. Since the rigidity of the cutting teeth differs depending on the angle of the cutting angle at different positions, and the magnitude of the cutting angle directly affects the rigidity of the cutting teeth at those positions, in order to ensure the overall rigidity of the cutting teeth, the cutting angle may change continuously along the first direction, with a larger cutting angle at positions where the rigidity of the cutting teeth is insufficient, and a smaller cutting angle at positions where the rigidity of the cutting teeth is high.

[0022] To more clearly explain the specific embodiments of the present application or the technical means in the prior art, the following briefly describes the drawings necessary for the description of the specific embodiments or the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, based on these drawings, other drawings can be obtained without creative labor.

Brief Description of the Drawings

[0023] [Figure 1] It is a three-dimensional schematic diagram of a shaving blade according to an embodiment of the present application. [Figure 2] It is an enlarged schematic diagram of part A of the shaving blade shown in FIG. 1. [Figure 3] It is a front view of the shaving blade shown in FIG. 1. [Figure 4] It is a plan view of the shaving blade shown in FIG. 1. [Figure 5] It is a cross-sectional view taken along B-B of the shaving blade shown in FIG. 4. [Figure 6] It is a cross-sectional view of the cutting teeth of the shaving blade shown in FIG. 5. [Figure 7] It is a cross-sectional view taken along C-C of the shaving blade shown in FIG. 4. [Figure 8] It is a cross-sectional view of the cutting teeth of the shaving blade shown in FIG. 7. [Figure 9] It is a cross-sectional view taken along D-D of the shaving blade shown in FIG. 4. [Figure 10] It is a cross-sectional view of the cutting teeth of the shaving blade shown in FIG. 9. [Figure 11] It is a comparison diagram when the cutting angle of the cutting teeth of the shaving blade shown in FIG. 1 is large. [Figure 12] It is a comparison diagram when the cutting angle of the cutting teeth of the shaving blade shown in FIG. 1 is small. [Figure 13] It is a comparison diagram when the tooth groove line of the cutting teeth of the shaving blade shown in FIG. 1 is a continuous curve. [Figure 14] It is a comparison diagram of the trajectory of the blade edge of the shaving blade shown in FIG. 1. [Figure 15]This is a schematic diagram of the preliminary cutting in the method for manufacturing a razor blade according to an embodiment of the present application. [Figure 16] Figure 15 is a schematic diagram of further cutting in the manufacturing method of the razor blade shown. [Figure 17] Figure 16 is a schematic diagram of further cutting in the manufacturing method of the razor blade shown. [Figure 18] Figure 17 is a schematic diagram of further cutting in the manufacturing method of the razor blade shown. [Figure 19] Figure 18 is a schematic diagram of further cutting in the manufacturing method of the razor blade shown. [Figure 20] Figure 19 is a schematic diagram of further cutting in the manufacturing method of the razor blade shown. [Figure 21] Figure 20 is a schematic diagram of further cutting in the manufacturing method of the razor blade shown. [Modes for carrying out the invention]

[0024] To further clarify the purpose, technical means, and advantages of the embodiments of this application, the technical means of the embodiments of this application will be described clearly and completely below with reference to the drawings of the embodiments. Clearly, the embodiments described are a part of, but not all, of, the embodiments of this application. All other embodiments that can be obtained based on the embodiments of this application without creative work by a person skilled in the art are all within the scope of protection of this application.

[0025] The embodiments of this application will be described below with reference to Figures 1 to 21.

[0026] According to an embodiment of the present invention, a shaving blade according to one aspect includes a blade body 1 and a plurality of cutting teeth 2 spaced apart on the blade body 1, wherein a cutting groove 3 is formed between two adjacent cutting teeth 2, and the wall surface of the cutting groove 3 is a continuous curved surface formed extending from the lower end surface of the cutting teeth toward the upper end surface of the cutting teeth.

[0027] In this embodiment of the shaving blade, the wall surface of the cutting groove 3 is a continuous curved surface formed extending from the lower end surface to the upper end surface of the cutting tooth 2. Compared to cases where the wall surface of the cutting groove 3 is formed by connecting multiple planes or by connecting a curved surface and a plane, stress is less likely to concentrate on the wall surface of this structure. Therefore, it does not affect the rigidity of the overall structure, and deformation during cutting, unshaved areas, and temperature rise can be effectively reduced. Furthermore, during heat treatment, the continuous curved surface receives heat more uniformly when heated, and temperature changes are more uniform when cooled, making it less prone to deformation during heat treatment and effectively solving the problem of low reliability of the side walls of conventional cutting teeth.

[0028] Specifically, as shown in Figure 13, the dashed lines in the figure represent the side walls of the cutting teeth 2 in related technologies, which are formed by connecting multiple angled wall surfaces. In this embodiment, the wall surface of the cutting groove 3 not only has a wider tooth width at the corresponding position, but the wall surface also changes more gradually.

[0029] In this embodiment, the wall surface of the cutting groove 3 is a series of continuous arcuate surfaces, which makes it easy to process and also results in a smoother transition between the wall surfaces of the cutting groove 3.

[0030] In this embodiment, a blade edge 201 is formed at the intersection of the wall surface of the cutting groove 3 and the lower end surface of the cutting tooth 2. The angle between the tangent to any point on the blade edge 201 and the lower end surface is the cutting angle. A plane perpendicular to the wall surface of the cutting groove 3 and the lower end surface intersects to form a tooth groove line 301. To ensure that the cutting tooth 2 has an appropriate thickness and good cutting performance, the inclination of each point on the tooth groove line 301 with respect to the lower end surface gradually increases along the direction away from the blade edge 201.

[0031] The appropriate thickness refers to the thickness of the cutting tooth 2 when the cutting edge 2 is sharp, under the condition that the inclination of each point on the tooth groove line 301 relative to the lower end surface gradually increases along the direction away from the blade edge 201. Here, the angle of the cutting angle is not specifically limited, and the blade edge 201 only needs to be able to cut hair quickly and effectively.

[0032] Specifically, by setting the inclination of the tooth groove line 301 to gradually increase along the direction away from the blade edge 201, and decreasing inclination in the portion of the tooth groove line 301 close to the blade edge 201, the blade edge 201 becomes sharper, and as the cutting teeth 2 extend from the bottom surface to the top surface, the tooth width of the cutting teeth 2 changes non-linearly, and the decrease in tooth width is more gradual, so the side walls of the cutting teeth 2 do not cross prematurely. Compared to the cutting teeth 2 in related technologies, the tooth width of the middle and upper part of the cutting teeth 2 in this embodiment is wider, and the overall tooth thickness is greater, so the overall rigidity of the cutting teeth 2 is higher. This makes it possible to make the cutting angle of the cutting teeth 2 very small, guarantee the rigidity of the cutting teeth 2, and effectively solve the problem that conventional shaving blades have difficulty achieving both sharpness and rigidity.

[0033] Specifically, in related technologies, in order to ensure that the cutting teeth 2 have a certain thickness, their cutting angle is generally greater than 80°, and the side walls and bottom surfaces of the cutting teeth 2 are approximately perpendicular. In this way, the cutting edge 201 on the side walls of the cutting groove 3 is dull, and only the part of the cutting edge 201 close to the bottom of the cutting groove 3 is sharp. When cutting hair, because the bottom of the side walls of the cutting teeth 2 is dull, the hair is mainly cut by the part close to the bottom of the cutting groove 3, and the hair cutting effect of cutting teeth 2 in this form is low. In the shaving blade of this embodiment, the cutting edge 201 on the side walls of the cutting groove 3 is also sharp, so the entire cutting edge 201 can effectively cut hair, and the hair cutting effect is greatly improved.

[0034] Here, the side wall of the cutting tooth 2 is the side wall of the cutting groove 3, referring to the wall surfaces located on both sides of the cutting groove 3; the tooth width of the cutting tooth 2 refers to the width of a single cutting tooth 2 in the "left-right" direction indicated by the arrow in Figure 3; and the tooth thickness of the cutting tooth 2 refers to the thickness of a single cutting tooth 2 in the "up-down" direction indicated by the arrow in Figure 3.

[0035] In this embodiment, the cutting angle corresponding to any point on the blade edge 201 is less than 75°, and the entire blade edge 201 can maintain a sharp cutting edge. When hair enters the cutting groove 3 and comes into contact with the blade edge 201, it begins to be cut. Some uncut hair comes into contact with the blade edge 201 in the middle of the cutting groove 3 and is cut, while the remaining hair comes into contact with the blade edge 201 at the bottom of the cutting groove 3 and is completely cut, thus ensuring that all hair that enters the cutting groove 3 is cut.

[0036] Furthermore, Figures 11 and 12 both show cross-sections perpendicular to the extension direction of the cutting tooth 2. Figure 11 shows the case with a large cutting angle, and Figure 12 shows the case with a small cutting angle. The solid line portion represents the cutting tooth 2 having a nonlinear tooth groove line 301 in this embodiment, and the dashed line portion represents the cutting tooth 2 having a linear tooth groove line 301 in related technologies. Here, a is the cutting angle, X is the tooth width, and Y is the tooth thickness. The extension direction of the cutting tooth 2 is perpendicular to the "up and down" and "left and right" directions indicated by the arrows in Figure 3.

[0037] The following provides a detailed explanation of how tooth thickness changes in accordance with the tooth width of cutting tooth 2.

[0038] The angle of section in Figure 11 is 70.2°, and the changes in nonlinear and linear tooth thickness are shown in Table 1 below.

[0039] [Table 1]

[0040] The angle of section in Figure 12 is 36.5°, and the changes in nonlinear and linear tooth thickness are shown in Table 2 below.

[0041] [Table 2]

[0042] As can be seen from the above data, when the tooth widths are the same, the thickness of the cutting teeth 2 having nonlinear tooth groove lines 301 is always greater than the thickness of the cutting teeth 2 having linear tooth groove lines 301. Therefore, the rigidity of the cutting teeth 2 having nonlinear tooth groove lines 301 is higher, and this phenomenon becomes more pronounced as the cutting angle decreases. The superiority of the structure of the cutting teeth 2 in this embodiment becomes more pronounced when the cutting edge 201 has better cutting performance.

[0043] Regarding the specific data for tooth width and tooth thickness, there is no limit to the units; any ratio as described above is acceptable. The table and data above are an example illustrating the structure of the nonlinear tooth groove line 301 in this embodiment, and are not limited to the above ratio relationship; they can be adjusted as needed.

[0044] In this embodiment, the specific nonlinear change of the tooth groove line 301 is not limited; it may be a continuous curve or a piecewise connected line, as long as it effectively improves the rigidity of the cutting tooth 2 when the cutting edge 201 is sharp.

[0045] In this embodiment, the direction from the opening of the cutting groove 3 to the bottom of the cutting groove 3 is the first direction, and the cutting angle corresponding to each point on the blade edge 201 changes continuously along the first direction. If the angle of the cutting angle differs at different positions on the cutting teeth 2, their rigidity will also differ. Since the magnitude of the cutting angle directly affects the rigidity of the cutting teeth 2 at those positions, in order to guarantee the overall rigidity of the cutting teeth 2, the cutting angle changes continuously along the first direction, and the angle of the cutting angle may be large at positions where the rigidity of the cutting teeth 2 is insufficient, and small at positions where the rigidity of the cutting teeth 2 is high.

[0046] Here, the opening of the cutting groove 3 refers to a position close to the end of the cutting tooth 2 of the cutting groove 3, and the bottom of the cutting groove 3 refers to a position close to the root of the cutting tooth 2 of the cutting groove 3.

[0047] Specifically, the range of change in the cutting angle is 5° to 75°.

[0048] In this embodiment, the cutting angle corresponding to each point on the blade edge 201 gradually decreases along the first direction, and when the overall rigidity of the cutting tooth 2 gradually decreases along the first direction, the cutting angle close to the opening of the cutting groove 3 is large, ensuring the rigidity of the end of the cutting tooth 2, and the rigidity of the part close to the root of the cutting tooth 2 is large. At this time, by making the cutting angle close to the bottom of the cutting groove 3 small, the cutting performance of this part is improved, the overall rigidity of the cutting tooth 2 is ensured as much as possible, and the cutting angle of the blade edge 201 is made as small as possible, thus maintaining the cutting performance of the blade edge 201 as much as possible.

[0049] In this embodiment, the cutting angle corresponding to each point on the blade edge 201 gradually decreases along the first direction, and then gradually increases.

[0050] Specifically, Figures 6, 8, and 10 show cross-sections along different positions in the first direction of the cutting tooth 2, respectively. When the end of the cutting tooth 2 is thick, the rigidity of the cutting tooth 2 along the first direction decreases before increasing. Therefore, by setting the cutting angle in this way, the overall rigidity of the cutting tooth 2 can be guaranteed, and the sharpness of the blade edge 201 can be maintained as much as possible.

[0051] In this embodiment, the blade edge 201 is a continuous curve, which effectively reduces stress concentration at the blade edge 201 and ensures rigidity at the blade edge 201.

[0052] Specifically, the wall surface of the cutting groove 3 is set to be parabolic in at least a portion of its contour in a direction parallel to the shear surface, and correspondingly, at least a portion of the blade edge 201 is set to be parabolic. This smoothly transitioning wall surface of the cutting groove 3 ensures the rigidity of the blade, especially the rigidity of each point on the outer circumference of the cutting groove 3, and similarly suppresses hair ejection to some extent, thereby improving the efficiency of hair cutting.

[0053] In this embodiment, the tooth groove 301 is a continuous curve to ensure that the wall surface of the cutting groove 3 transitions smoothly in the direction of extension of the tooth groove 301, and to ensure the rigidity of this portion.

[0054] Specifically, the tooth groove line 301 is a series of continuous arcs, and preferably, the inclination of the tooth groove line 301 in the corresponding cross-section changes continuously. Using the XY coordinate system of Figure 11 or Figure 12 as an example, at least a portion of the inclination k of the tooth groove line 301 increases sharply in the interval k=tan5° to k=tan75° from the bottom surface to the top surface of the cutting tooth 2, and the thickness of the cutting tooth 2 increases sharply in the direction of travel from the bottom surface to the top surface. Since such a change is nonlinear, if the cutting edge 201 corresponding to that portion is sharp, for example, if the cutting angle of the cutting edge is small, such as 5°, the thickness of the other portion of the cutting tooth 2 increases sharply, and the overall rigidity of the blade can be effectively improved.

[0055] In this embodiment, the direction from the bottom of the cutting groove 3 toward the opening of the cutting groove 3 is the second direction, and the width of the cutting groove 3 increases and then decreases along the second direction, with the width at the opening of the cutting groove 3 being smaller. Hair that enters the cutting groove 3 is restricted by the opening of the cutting groove 3, ensuring that the hair that enters the cutting groove 3 is effectively cut and then discharged, further improving the efficiency of hair cutting.

[0056] Specifically, as shown in Figure 14, the direction indicated by the arrow is the direction in which the hair is subjected to force. The left side shows the shape of the cutting groove in related technology, which is V-shaped overall. A cutting groove of this structure affects cutting efficiency because it pushes uncut hair that enters the cutting groove 3 during operation out of the cutting groove 3. The right side shows the shape of the cutting groove 3 in this embodiment. The cutting groove 3 in this embodiment has a narrow opening overall, and the inclination of the tangents at each point on the blade edge 201 is all different. The cutting groove 3 as a whole tends to accommodate hair. The cutting groove 3 in this embodiment pushes uncut hair that enters the cutting groove 3 during operation towards the center of the cutting groove 3. Compared to the cutting groove in related technology, the cutting groove 3 in this embodiment can ensure that the hair that enters the cutting groove 3 is cut more completely.

[0057] Note that the shape of the cutting groove 3 on the right side of Figure 14 is merely a schematic representation of the shape of the cutting groove 3 in the embodiment. The curvature of the side wall of the cutting groove 3 is not limited to the degree shown in the figure. The curvature of the side wall of the cutting groove 3 may be smaller or larger than the degree shown in the figure, as long as it can form a narrow opening and improve the effect of accommodating hair.

[0058] In an alternative embodiment, the blade edge 201 may be U-shaped, and to further improve the rigidity of the cutting teeth, the wall surface of the cutting groove 3 is a continuous curved surface or continuous arc surface surrounding the blade edge 201. When the wall surface of the cutting groove 3 is a continuous arc surface or curved surface surrounding the blade edge 201, the contour of the blade edge 201 may be parabolic, arc-shaped, or arch-shaped, as long as it satisfies the usage needs.

[0059] In this embodiment, as shown in Figure 15, the ends of the cutting teeth 2 may be set to spread outwards. The ends of the cutting teeth 2 with this structure guide the hair into the cutting groove 3, further improving the efficiency of hair cutting.

[0060] The shaving blade according to this embodiment is applicable to fields such as personal care, hair care, pet care, and medical care. The shaving blade may be applied to rotary shaving blades or reciprocating shaving blades. Preferably, the shaving blades shown in the figure are all reciprocating shaving blades. The main improvement of this application lies in the cutting teeth portion, so the cutting tooth structure according to this embodiment can be applied regardless of whether it is a rotary or reciprocating blade. Rotary shaving blades will not be described here.

[0061] According to the embodiments of the present application, a method for manufacturing a razor blade for manufacturing the above-mentioned razor blade, according to another embodiment, The process includes the steps of creating a blade body 1 and cutting the blade body 1 with a cutting wheel 4 to form cutting teeth 2. The diameter of the cutting wheel 4 is 80 mm or less, and a cutting groove 3 is formed between two adjacent cutting teeth 2. The wall surface of the cutting groove 3 is a continuous curved surface that extends from the lower end surface to the upper end surface of the cutting tooth. The wall surface of the cutting groove 3 and a plane perpendicular to the lower end surface intersect to form a tooth groove line 301, and the inclination of each point on the tooth groove line 301 with respect to the lower end surface gradually increases along the direction away from the cutting edge 201.

[0062] In this embodiment, in the step of forming cutting teeth 2 by cutting the blade body 1 with the cutting wheel 4, the cutting angle corresponding to any point on the cutting edge 201 of the cutting teeth 2 is less than 75°.

[0063] Specifically, in related technologies, cutting teeth 2 are usually processed using a large-diameter cutting wheel 4 or by pressing. When processing with a large-diameter cutting wheel 4, the cutting angle of the middle and opening portions of the cutting groove 3 is generally 80° or more, resulting in poor cutting performance. When processing by pressing, the side walls of the cutting groove 3 are generally flat, making it impossible to change the inclination of the tooth groove line 301. Furthermore, sharp-angle pressing places very high demands on the mold, the punch wears easily, processing costs are high, and quality problems are likely to occur. Therefore, the cost of sharp-angle pressing is far higher than the cost of cutting teeth with a cutting wheel 4. Compared to the manufacturing methods in related technologies, the diameter of the cutting wheel 4 used in the manufacturing method of this embodiment is smaller, allowing for a smaller cutting angle, and enabling the inner wall and blade edge 201 of the cutting groove 3 to have a constant arc.

[0064] Furthermore, the specific type of cutting wheel 4 is not limited; it should be capable of performing reliable cutting operations.

[0065] Preferably, the diameter of the cutting wheel 4 is 17 mm or more and 80 mm or less, and the type of cutting wheel 4 is a grinding wheel.

[0066] In this embodiment, in the step of forming cutting teeth 2 by cutting the blade body 1 with the cutting wheel 4, The cutting wheel 4 cuts the blade body 1 to form cutting grooves 3, forming cutting teeth 2 between any two adjacent cutting grooves 3, the cutting wheel 4 is fed from the bottom of the cutting groove 3 to the opening of the cutting groove 3, the cutting wheel 4 is inclined toward the lower end of the end of the cutting teeth 2 during the feeding process, and / or the rotational speed of the cutting wheel 4 is 3000 r / min to 5000 r / min, and the cutting feed rate of the cutting wheel 4 is 0.1 mm / min to 10 mm / min.

[0067] Specifically, a high-precision NC cylindrical grinding machine is used for the precision cutting of the tooth profile. After precision cutting, an undercut is formed on the contour of the cutting edge of the product, and the cross-sectional width of the tooth tip is greater than the cross-sectional width of the middle of the tooth profile. The cutting wheel starts grinding from the top surface of the blank and is fed towards the opening at an incline to the lower edge of the toothed leading edge. The width dimension of the tooth profile matches within 0.05 mm, and the depth dimension of the tooth matches within 0.15 mm.

[0068] In this embodiment, the step of making the blade body 1 is The process includes the steps of preparing a blank and forming the blade body 1 by machining the blank to match the external dimensions of the blade body 1.

[0069] Specifically, the dimensional specifications for the blank in this embodiment are based on a metal sheet with a thickness of 2 mm. The blade body 1 is formed by punching it out of the blank using a press. A high-precision continuous die is used for the press to perform precision punching on the outer shape and circular hole of the product. The processing is completed using a high-precision 160T press machine, and the outer dimensions of the blank to be pressed are 33 × 36 × 2 mm. Actual production efficiency can reach approximately 10,000 to 15,000 units per shift. When combined with subsequent tooth profile processing, two tooth profile processing auxiliary options are possible in this step: punching without tooth cutting or pre-roughing for tooth cutting. When pre-roughing for tooth cutting is performed, the press function is added by the press die to roughly cut and punch out the tooth profile of the product, reducing the cutting pressure and improving tooth cutting efficiency. In this way, the punched tooth profile leaves a cutting allowance of 0.1 mm or more on each side compared to the tooth cutting tooth profile.

[0070] Preferably, the blank surface is smooth and free from defects, dents, oil stains, and scratches.

[0071] In this embodiment, the step of preparing the blank is: The process includes the steps of: obtaining the hardness of a blank; forming a blade body 1 using the blank if the hardness of the blank is equal to or greater than a predetermined hardness; and heat-treating the blank to form the blade body 1 if the hardness of the blank is less than a predetermined hardness.

[0072] In this embodiment, if the hardness of the blank is less than a predetermined hardness, the step of heat-treating the blank is omitted. The process includes the steps of: placing a blank into a heat treatment apparatus and heat-treating the blank with the heat treatment apparatus, wherein the heat treatment temperature range is 850°C to 1300°C and the holding time is 30 minutes or more; and cooling the blank to a predetermined temperature range of room temperature to 65°C, and then removing it from the heat treatment apparatus.

[0073] Specifically, the heat treatment is vacuum heat treatment. The blank is placed in a heat treatment furnace and subjected to vacuum heat treatment. The temperature of the heat treatment furnace is 1200℃±5℃, the holding time is 35 min, and rapid cooling is performed using nitrogen gas. When the temperature reaches 40℃~60℃, it is removed from the heat treatment furnace, and precise settings and control are performed. The above heat treatment parameters are input into the heat treatment control system, and the device completes the processing according to the input processing parameters. By setting it in this way, the hardness can be precisely controlled and stabilized, for example, the hardness of 420J2 material can be controlled to HRC52~HRC56. In this step, the production efficiency is such that approximately 15,000 pieces can be processed per furnace. By using vacuum heat treatment, it is possible to ensure that both the hardness and deformation of the product are in an ideal state, and product consistency can be ensured.

[0074] Specifically, after forming the blade body 1 using a blank, surface rough polishing is required to remove burrs from the surface. Polishing is performed using a centrifugal barrel polishing machine, and the rotation speed of the cutting wheel 4 is 40 r / min to 70 r / min. In this step, the production efficiency is approximately 10,000 units per shift.

[0075] In this embodiment, after the step of cutting the blade body 1 with the cutting wheel 4 to form the cutting teeth 2, The method further includes polishing the surface of the cutting tooth 2 so that the flatness and surface roughness of the cutting tooth 2 reach predetermined levels of flatness and surface roughness.

[0076] Specifically, polishing includes surface finishing polishing and tooth surface finishing polishing. In surface finishing polishing, a finishing polishing machine is used to remove burrs from the tooth profile of the product. The finishing polishing machine is a centrifugal barrel polishing machine, and the specific barrel rotation speed of the polishing machine is 40 r / min to 70 r / min. Tooth surface finishing polishing mainly polishes the cutting edge, and this is produced by polishing using a high-precision NC polishing machine. The high-precision NC polishing machine is a high-precision 910 NC polishing machine, which includes three processes: rough polishing, semi-finishing polishing, and finishing polishing. The flatness of the shear surface polishing can be controlled to within 0.01, the difference in height of the polished surface at the tooth profile position on the shear surface, i.e., the straightness tolerance, can be controlled to within ±0.008, and the roughness of the polished surface can be controlled to approximately Ra 0.06.

[0077] In this embodiment, after the polishing step, it is necessary to perform cleaning, drying, and visual inspection. In cleaning and drying, ultrasonic cleaning is used to remove any polishing residue remaining on the product surface, and in visual inspection, defective products are sorted out using visual inspection to ensure that the finished product is free from tooth breakage, bending, dents, scratches, rust, stains, deformation, etc.

[0078] The following describes all steps of the manufacturing method for a shaving blade according to this embodiment, using a metal sheet with a thickness of 2.8 mm as a blank.

[0079] In Step 1, prepare the material by taking a metal sheet with a smooth surface, free from defects, bumps, oil stains, and scratches, and with a thickness of 2.8 mm.

[0080] In step 2, the product is formed by punching with a press. A high-precision continuous die is used for the press to perform precision punching on the product's outer shape and circular holes. The processing is completed using a 160T high-precision press, and the outer dimensions of the blank to be pressed are 33 × 36 × 2.8 mm. Similarly, when combined with subsequent tooth profile processing, an auxiliary method for punching without tooth cutting may be possible in this step, and preliminary rough machining for tooth cutting may be performed. Similarly, when adding a press function with a press die to roughly cut the tooth profile of the product and punch it out, in order to reduce cutting pressure and improve tooth cutting efficiency, the punched tooth profile leaves a cutting allowance of 0.1 mm or more on each side compared to the tooth cutting tooth profile.

[0081] In step 3, vacuum heat treatment is performed. The blank obtained in step 2 is placed in a heat treatment furnace and subjected to vacuum heat treatment. The temperature of the heat treatment furnace is 900°C ± 5°C, the holding time is 55 min, and rapid cooling is performed using nitrogen gas. When the temperature reaches 50°C ± 5°C, it is removed from the heat treatment furnace. Precise settings and control are performed. The above heat treatment parameters are input into the heat treatment control system, and the device completes the processing according to the input processing parameters. Hardness is precisely controlled and stabilized during the processing process.

[0082] In step 4, the surface is roughly polished, and then polished using a centrifugal barrel polishing machine, with the rotation speed of the cutting wheel 4 being 40 r / min to 70 r / min.

[0083] In step 5, the tooth profile is precisely cut. A high-precision NC cylindrical grinding machine is used for the precise cutting of the tooth profile. The diameter of the cutting wheel 4 is 17 mm to 80 mm, the rotational speed of the cutting wheel 4 is 600 r / min to 1000 r / min, the cutting feed rate is 10 mm / min, and the cutting edge angle range for machining is 5° to 75°. The cutting wheel 4 may be fed inclined toward the opening towards the lower edge of the toothed leading edge, as in the above embodiment, or it may be fed toward the bottom from the opening. Similarly, the width dimension of the tooth profile matches within 0.05 mm, and the depth dimension of the tooth matches within 0.15 mm.

[0084] In step 6, surface finishing polishing is performed, and burrs from the tooth profile of the product are removed using a finishing polishing machine. The finishing polishing machine is a centrifugal barrel polishing machine, and the specific barrel rotation speed of the polishing machine is 40 r / min to 70 r / min.

[0085] In step 7, the tooth surface is polished to finish, and the cutting edge surface is polished using a high-precision NC polishing machine. The high-precision NC polishing machine is a high-precision 910NC polishing machine, which includes three processes: rough polishing, intermediate polishing, and finish polishing, and the flatness of the shear surface polishing can be controlled to within 0.01. The difference in height of the polished surface at the tooth profile position on the shear surface can be controlled to within ±0.008, and the roughness of the polished surface can be controlled to approximately Ra0.06.

[0086] In step 8, the product is cleaned, dried, and ultrasonic cleaning is used to remove any remaining polishing residue from the product surface.

[0087] In Step 9, a visual inspection is performed to identify defective products that have damaged teeth, bent teeth, dents, scratches, rust, stains, deformation, etc.

[0088] While embodiments of the present application are described with reference to the drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations are included within the scope limited by the claims. [Explanation of symbols]

[0089] 1 Blade body 2 Cutting teeth 201 Blade edge 3 Cutting groove 301 Tooth groove line 4 Cutting Wheels

Claims

1. Blade body (1), A shaving blade comprising a plurality of cutting teeth (2) arranged at intervals on the blade body (1), wherein a cutting groove (3) is formed between two adjacent cutting teeth (2), and the wall surface of the cutting groove (3) is a continuous curved surface formed extending from the lower end surface of the cutting teeth (2) toward the upper end surface of the cutting teeth (2).

2. The shaving blade according to claim 1, characterized in that the wall surface of the cutting groove (3) is a plurality of continuous arcuate surfaces.

3. A shaving blade according to claim 1 or 2, characterized in that a blade edge (201) is formed at the intersection of the wall surface of the cutting groove (3) and the lower end surface of the cutting teeth (2), the angle between the tangent to any point on the blade edge (201) and the lower end surface is the cutting angle, the wall surface of the cutting groove (3) and a plane perpendicular to the lower end surface intersect to form a tooth groove line (301), and the inclination of each point on the tooth groove line (301) with respect to the lower end surface gradually increases along the direction away from the blade edge (201) so that the cutting teeth (2) have an appropriate thickness and good cutting performance.

4. The shaving blade according to claim 3, characterized in that the cutting angle corresponding to any point on the blade edge (201) is less than 75°.

5. The shaving blade according to claim 3, characterized in that the direction from the opening of the cutting groove (3) toward the bottom of the cutting groove (3) is a first direction, and the cutting angle corresponding to each point on the blade edge (201) changes continuously along the first direction.

6. The cutting angle corresponding to each point on the blade edge (201) gradually decreases along the first direction, or The shaving blade according to claim 5, characterized in that the cutting angle corresponding to each point on the blade edge (201) first gradually decreases along the first direction and then gradually increases.

7. The shaving blade according to claim 3, characterized in that the blade edge (201) is a continuous curve.

8. A method for manufacturing a razor blade according to any one of claims 1 to 7, Steps to make the blade body (1), The process includes the step of cutting the blade body (1) with a cutting wheel (4) to form cutting teeth (2), A method for manufacturing a shaving blade, characterized in that the diameter of the cutting wheel (4) is 80 mm or less, a cutting groove (3) is formed between two adjacent cutting teeth (2), and the wall surface of the cutting groove (3) is a continuous curved surface formed extending from the lower end surface of the cutting teeth (2) toward the upper end surface of the cutting teeth (2).

9. In the step of forming the cutting teeth (2) by cutting the blade body (1) with the cutting wheel (4), The cutting wheel (4) cuts the blade body (1) to form the cutting groove (3), the cutting teeth (2) are formed between any two adjacent cutting grooves (3), the cutting wheel (4) is fed from the bottom of the cutting groove (3) toward the opening of the cutting groove (3), the cutting wheel (4) is inclined toward the lower end of the end of the cutting teeth (2) during the feeding process, and / or The method for manufacturing a shaving blade according to claim 8, characterized in that the rotational speed of the cutting wheel (4) is 3000 r / min to 5000 r / min, and the cutting feed rate of the cutting wheel (4) is 0.1 mm / min to 10 mm / min.

10. The step of making the blade body (1) is as follows: Steps to prepare the blank, A method for manufacturing a shaving blade according to claim 8 or 9, comprising the step of processing the blank to match the external dimensions of the blade body (1) to form the blade body (1).

11. The step of preparing the aforementioned blank is: The steps include obtaining the hardness of the blank, If the hardness of the blank is equal to or greater than a predetermined hardness, the steps include forming the blade body (1) using the blank, A method for manufacturing a shaving blade according to claim 10, comprising the step of heat-treating the blank to form the blade body (1) if the hardness of the blank is less than the predetermined hardness.

12. If the hardness of the blank is less than the predetermined hardness, the step of heat-treating the blank is: A step of placing the blank into a heat treatment apparatus and heat-treating the blank with the heat treatment apparatus, wherein the heat treatment temperature range is 850°C to 1300°C and the holding time is 30 min or more. A method for manufacturing a shaving blade according to claim 11, comprising the step of cooling the blank to a predetermined temperature range of room temperature to 65°C and then removing it from the heat treatment apparatus.

13. After the step of cutting the blade body (1) with the cutting wheel (4) to form the cutting teeth (2), The method for manufacturing a razor blade according to claim 8 or 9, further comprising the step of polishing the surface of the cutting teeth (2) so that the flatness and surface roughness of the surface of the cutting teeth (2) reach predetermined flatness and surface roughness.

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