Shaving blade and manufacturing method therefor

Abstract

A shaving blade, comprising: a blade body (1); and a plurality of cutting teeth (2), arranged on the blade body (1) at intervals, wherein a cutting groove (3) is formed between every two adjacent cutting teeth (2), and the wall surfaces of the cutting grooves (3) extend from the lower end surfaces of the cutting teeth to the upper end surfaces of the cutting teeth and form a consecutive curved surface. The wall surface of the shaving blade is prone to generating stress concentration, so that the rigidity of the overall structure is not affected, and the phenomena of deformation, blade jumping, and temperature increase in the hair shearing process can be effectively reduced; additionally, during heat treatment, the consecutive curved surface is heated more uniformly during heating and experiences more uniform temperature changes during cooling, so that deformation is not prone to occurring in the heat treatment process, thereby effectively solving the problem of poor reliability of the side walls of existing cutting teeth. Also disclosed is a manufacturing method for the shaving blade. The plurality of cutting teeth are formed by cutting by cutting wheels (4), and the diameter of each cutting wheel is less than or equal to 80 mm.

Description

Shaving blade and method of manufacturing the same

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on June 29, 2023, with application number 202310790653.3 and invention name “Shaving Blade and Its Manufacturing Method”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of shaving blades, and in particular to shaving blades and a method for manufacturing the same. Background Art

[0004] The shaving blade is the primary working component of a shaver. Existing shavers primarily include rotary and reciprocating types. The shaving blade rotates or oscillates within the shaver's head, causing it to move relative to a fixed blade net to remove hairs that enter between the blade and the fixed blade net. The cutting end of the shaving blade typically has multiple cutting teeth spaced at intervals. The reliability of the cutting teeth during the hair cutting process can affect the hair cutting effect.

[0005] At present, the side walls of existing cutting teeth are usually connected by multiple wall sections. The side walls of the cutting teeth are the side walls of the cutting grooves. When the side walls of the cutting teeth extend from bottom to top in the vertical direction, the side walls of the cutting teeth are usually connected by multiple planes at different angles, or the side walls of the cutting teeth are connected by curved surfaces and planes. Since the angle at the connection between the two adjacent surfaces changes suddenly, when the cutting teeth are in use, stress concentration will occur at the connection between the two adjacent surfaces, which will affect the rigidity of the structure and easily cause deformation, tool jumping and increased temperature rise. At the same time, the side walls of this structure are also prone to deformation due to uneven heating during the heat treatment step in the manufacturing process. Therefore, the side walls of the existing cutting teeth still have the problem of poor reliability.

[0006] Summary of the Invention

[0007] In view of this, the present application provides a shaving blade and a manufacturing method thereof to solve the problem of poor reliability of the side walls of existing cutting teeth.

[0008] In a first aspect, the present application provides a shaving blade comprising: a blade body; a plurality of cutting teeth arranged at intervals on the blade body, with a cutting groove formed between two adjacent cutting teeth, and the wall of the cutting groove extending from the lower end face of the cutting tooth toward the upper end face of the cutting tooth and forming a continuous curved surface.

[0009] In an optional embodiment, the wall surface of the cutting groove is a plurality of continuous arc surfaces.

[0010] In an optional embodiment, the intersection of the wall of the cutting groove and the lower end face of the cutting tooth forms a blade edge, and the angle formed by the tangent at any point on the blade edge and the lower end face is the cutting angle. The wall of the cutting groove intersects with the plane perpendicular to the lower end face to form a tooth groove line, and the slope of each point on the tooth groove line relative to the lower end face gradually increases in the direction away from the blade edge, so that the cutting teeth remain sharp while having a corresponding thickness.

[0011] In an optional embodiment, the cutting angle corresponding to any point on the blade edge is less than 75°.

[0012] In an optional embodiment, the direction from the notch of the cutting groove toward the groove 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.

[0013] In an optional embodiment, the cutting angle corresponding to each point on the blade edge gradually decreases along the first direction, or the cutting angle corresponding to each point on the blade edge first gradually decreases and then gradually increases along the first direction.

[0014] In an optional embodiment, the blade edge is a continuous curve.

[0015] In a second aspect, the present application further provides a method for manufacturing a shaving blade, which is used to manufacture the above-mentioned shaving blade, and the manufacturing method comprises:

[0016] A blade body is manufactured; cutting teeth are formed on the blade body by cutting with a cutting wheel; wherein the diameter of the cutting wheel is less than or equal to 80 mm, a cutting groove is formed between two adjacent cutting teeth, and the wall surface of the cutting groove extends from the lower end surface of the cutting tooth toward the upper end surface of the cutting tooth and forms a continuous curved surface.

[0017] In an optional embodiment, in the step of cutting the cutting teeth on the blade by the cutting wheel,

[0018] The cutting wheel cuts to form cutting grooves on the blade, and cutting teeth are formed between any two adjacent cutting grooves. The cutting wheel is fed from the bottom of the cutting groove toward the groove mouth of the cutting groove. The cutting wheel is tilted toward the lower end of the end of the cutting tooth during the feeding process, and / or the rotation speed of the cutting wheel is 5000r / min to 3000r / min, and the cutting feed speed of the cutting wheel is 0.1mm / min to 10mm / min.

[0019] In an optional embodiment, the steps of making the blade include:

[0020] Prepare a blank; process the blank into a blade according to the appearance size of the blade.

[0021] In an optional embodiment, the step of preparing the blank includes:

[0022] The hardness of the blank is obtained; if the hardness of the blank is greater than or equal to a preset hardness, the blank is formed into a blade body; if the hardness of the blank is less than the preset hardness, the blank is heat treated to form a blade body.

[0023] In an optional embodiment, if the hardness of the blank is less than a preset hardness, the step of heat treating the blank includes:

[0024] The blank is placed in a heat treatment device, and the heat treatment temperature range of the heat treatment device is 850℃ to 1300℃, and the holding time is greater than or equal to 30min; the blank is cooled to a preset temperature range and then taken out from the heat treatment device, and the preset temperature range is room temperature to 65℃.

[0025] In an optional embodiment, after the step of cutting the cutting teeth on the blade by the cutting wheel, the method further comprises:

[0026] The surface of the cutting teeth is ground so that the flatness and surface roughness of the cutting teeth reach the preset flatness and preset surface roughness. Beneficial effects:

[0027] 1. The wall of the cutting groove extends from the lower end face of the cutting tooth toward the upper end face of the cutting tooth and forms a continuous curved surface. Compared with the wall of the cutting groove connected by multiple planes or connected by curved surfaces and planes, the wall of this structure is not easy to produce stress concentration, and thus will not affect the rigidity of the overall structure. It can effectively reduce deformation, knife jumping and temperature increase during the shearing process. At the same time, during heat treatment, the continuous curved surface is heated more evenly when heated, and the temperature change is also more uniform when cooled. It is not easy to deform during the heat treatment process, which effectively solves the problem of poor reliability of the side wall of the existing cutting tooth.

[0028] 2. The slope of the tooth groove line is set to gradually increase in the direction away from the blade edge. The slope of the tooth groove line close to the blade edge is smaller, making the blade edge sharper. When the cutting tooth extends from the bottom surface to the top surface, the tooth width of the cutting tooth changes nonlinearly, and the tooth width decreases more slowly. Therefore, the two side walls of the cutting tooth will not intersect too early. The tooth width of the middle and upper part of the cutting tooth is wider, and the overall tooth thickness is also thicker, which makes the overall rigidity of the cutting tooth higher. In this way, the cutting angle of the cutting tooth can be made very small while ensuring the rigidity of the cutting tooth, effectively solving the problem that the existing shaving blades are difficult to balance sharpness and rigidity.

[0029] 3. Since the cutting angles at different positions of the cutting teeth are different, their rigidity is also different, and the size of the cutting angle will directly affect the rigidity of the cutting teeth at that position. In order to ensure the overall rigidity of the cutting teeth, the cutting angle changes continuously along the first direction. At the position where the cutting teeth have insufficient rigidity, the cutting angle is larger, and at the position where the cutting teeth have higher rigidity, the cutting angle can be smaller. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] FIG1 is a three-dimensional schematic diagram of a shaving blade according to an embodiment of the present application;

[0032] FIG2 is an enlarged schematic diagram of point A of the shaving blade shown in FIG1 ;

[0033] FIG3 is a front view of the shaving blade shown in FIG1 ;

[0034] FIG4 is a top view of the shaving blade shown in FIG1 ;

[0035] FIG5 is a cross-sectional view of the shaving blade at position BB shown in FIG4 ;

[0036] FIG6 is a cross-sectional view of the cutting teeth of the shaving blade shown in FIG5;

[0037] FIG7 is a cross-sectional view of the shaving blade at CC shown in FIG4;

[0038] FIG8 is a cross-sectional view of the cutting teeth of the shaving blade shown in FIG7;

[0039] FIG9 is a cross-sectional view of the shaving blade shown in FIG4 at DD;

[0040] FIG10 is a cross-sectional view of the cutting teeth of the shaving blade shown in FIG9;

[0041] FIG11 is a comparison diagram of the shaving blade shown in FIG1 when the cutting angle of the cutting teeth is large;

[0042] FIG12 is a comparison diagram of the shaving blade shown in FIG1 when the cutting angle of the cutting teeth is smaller;

[0043] FIG13 is a comparison diagram of the shaving blade shown in FIG1 when the tooth groove line of the cutting teeth is a continuous curve;

[0044] FIG14 is a comparison diagram of the trajectory of the edge of the shaving blade shown in FIG1 ;

[0045] FIG15 is a schematic diagram of preliminary cutting in a method for manufacturing a shaving blade according to an embodiment of the present application;

[0046] FIG16 is a schematic diagram of further cutting in the manufacturing method of the shaving blade shown in FIG15;

[0047] FIG17 is a schematic diagram of further cutting in the manufacturing method of the shaving blade shown in FIG16;

[0048] FIG18 is a schematic diagram of further cutting in the manufacturing method of the shaving blade shown in FIG17;

[0049] FIG19 is a schematic diagram of further cutting in the manufacturing method of the shaving blade shown in FIG18;

[0050] FIG20 is a schematic diagram of further cutting in the manufacturing method of the shaving blade shown in FIG19;

[0051] FIG. 21 is a schematic diagram showing a further step of cutting in the manufacturing method of the shaving blade shown in FIG. 20 .

[0052] Description of reference numerals:

[0053] 1. Blade; 2. Cutting teeth; 201. Blade edge; 3. Cutting groove; 301. Tooth groove line; 4. Cutting wheel. DETAILED DESCRIPTION

[0054] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0055] The following describes an embodiment of the present application in conjunction with Figures 1 to 21.

[0056] According to an embodiment of the present application, on the one hand, a shaving blade is provided, comprising: a blade body 1 and a plurality of cutting teeth 2, wherein the plurality of cutting teeth 2 are arranged at intervals on the blade body 1, and a cutting groove 3 is formed between two adjacent cutting teeth 2, and the wall surface of the cutting groove 3 extends from the lower end surface of the cutting tooth toward the upper end surface of the cutting tooth and forms a continuous curved surface.

[0057] When using the shaving blade of this embodiment, the wall of the cutting groove 3 extends from the lower end face of the cutting tooth 2 toward the upper end face of the cutting tooth 2 and forms a continuous curved surface. Compared with the wall of the cutting groove 3 connected by multiple planes or connected by curved surfaces and planes, the wall of this structure is not easy to produce stress concentration, and thus will not affect the rigidity of the overall structure. It can effectively reduce the deformation, knife jumping and temperature increase during the hair cutting process. At the same time, during heat treatment, the continuous curved surface is heated more evenly when heated, and the temperature change is also more uniform when cooled. It is not easy to deform during the heat treatment process, which effectively solves the problem of poor reliability of the side wall of the existing cutting tooth.

[0058] Specifically, as shown in Figure 13, the dotted part in the figure is the side wall of the cutting tooth 2 in the related art, which is composed of multiple angled wall sections. The wall of the cutting groove 3 of this embodiment not only has a faster tooth width at the corresponding position, but also has a smoother wall change.

[0059] In this embodiment, the wall surface of the cutting groove 3 is a plurality of continuous arc surfaces, which is easier to process and makes the wall surface of the cutting groove 3 smoother.

[0060] In this embodiment, the intersection of the wall of the cutting groove 3 and the lower end face of the cutting tooth 2 forms a blade edge 201, and the angle formed by the tangent at any point on the blade edge 201 and the lower end face is the cutting angle. The wall of the cutting groove 3 intersects with the plane perpendicular to the lower end face to form a tooth groove line 301, and the slope of each point on the tooth groove line 301 relative to the lower end face gradually increases in the direction away from the blade edge 201, so that the cutting tooth 2 remains sharp while having a corresponding thickness.

[0061] Here, the corresponding thickness refers to the thickness of the cutting tooth 2 when the cutting tooth 2 is relatively sharp, under the condition that the slope of each point on the tooth groove line 301 relative to the lower end surface gradually increases in the direction away from the blade edge 201. The angle of the cutting angle is not specifically limited here, so that the blade edge 201 can cut hair quickly and effectively.

[0062] Specifically, the slope of the tooth groove line 301 is set to gradually increase in the direction away from the blade edge 201, and the slope of the tooth groove line 301 close to the blade edge 201 is smaller, so that the blade edge 201 is sharper. When the cutting tooth 2 extends from the bottom surface to the top surface, the tooth width of the cutting tooth 2 changes nonlinearly, and the tooth width decreases more slowly. Therefore, the two side walls of the cutting tooth 2 will not intersect too early. Compared with the cutting tooth 2 in the related art, the tooth width of the middle and upper part of the cutting tooth 2 in this embodiment is wider, and the overall tooth thickness is also thicker, so that the overall rigidity of the cutting tooth 2 is higher. In this way, the cutting angle of the cutting tooth 2 can be made very small while ensuring the rigidity of the cutting tooth 2, effectively solving the problem that the existing shaving blades are difficult to balance sharpness and rigidity.

[0063] Specifically, in the related art, 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 of the cutting teeth 2 are approximately perpendicular to the bottom surfaces of the cutting teeth 2, so that the blade edges 201 at the side walls of the cutting groove 3 are not sharp enough, and only the blade edges 201 of the cutting groove 3 near the bottom of the groove are relatively sharp. When cutting hair, due to the insufficient sharpness of the bottom of the side walls of the cutting teeth 2, the hair is mainly cut off by the part of the cutting groove 3 near the bottom of the groove. The hair cutting effect of this type of cutting teeth 2 is poor; while the shaving blade of this embodiment can make the blade edges 201 at the side walls of the cutting groove 3 also relatively sharp, so that the entire blade edge 201 can effectively cut hair, greatly improving the hair cutting effect.

[0064] Among them, the side walls of the cutting tooth 2 are the side walls of the cutting groove 3, which refer to the wall surfaces 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 and 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 and down" direction indicated by the arrow in Figure 3.

[0065] In this embodiment, the cutting angle corresponding to any point on the blade edge 201 is less than 75°, and the blade edge 201 as a whole can remain sharp. Cutting begins as soon as the hair enters the cutting groove 3 and contacts the blade edge 201. A portion of the uncut hair contacts the blade edge 201 in the middle part of the cutting groove 3 to complete the cutting, and the remaining hair is completely cut after contacting the blade edge 201 at the bottom of the cutting groove 3, which can ensure that all the hair entering the cutting groove 3 is completely cut.

[0066] Furthermore, as shown in Figures 12 and 13, both are cross-sections perpendicular to the extension direction of the cutting teeth 2. Figure 12 shows the situation when the cutting angle is large, and Figure 13 shows the situation when the cutting angle is small. The solid line portion represents the cutting teeth 2 with nonlinear tooth groove lines 301 of this embodiment, and the dashed line portion represents the cutting teeth 2 with nonlinear tooth groove lines 301 in the related art. α is the cutting angle, X is the tooth width, and Y is the tooth thickness. The extension direction of the cutting teeth 2 is perpendicular to the "up-down" and "left-right" directions indicated by the arrows in Figure 3.

[0067] The following is an explanation of how the tooth thickness of cutting tooth 2 changes with tooth width:

[0068] The cutting angle in Figure 12 is 70.2°. The changes in nonlinear and linear tooth thickness are shown in Table 1.

[0069] Table 1

[0070] The cutting angle in Figure 13 is 36.5°. The changes in tooth thickness for nonlinear and linear tooth thickness are shown in Table 2 below.

[0071] Table 2

[0072] It can be seen from the above data that when the tooth width is consistent, the thickness of the cutting tooth 2 with a nonlinear tooth groove line 301 is greater than the thickness of the cutting tooth 2 with a linear tooth groove line 301. Therefore, the cutting tooth 2 with a nonlinear tooth groove line 301 has higher rigidity, and this phenomenon is more significant as the cutting angle becomes smaller. The structural advantage of the cutting tooth 2 of this embodiment is more obvious when the blade edge 201 is sharper.

[0073] The specific data of the tooth width and tooth thickness are not limited to units, and can be in this ratio; the above table and data are examples of the nonlinear tooth groove line 301 structure of this embodiment, and are not limited to the above proportional relationship and can be adjusted arbitrarily according to needs.

[0074] It should be noted that the specific nonlinear change of the tooth groove line 301 in this embodiment is not limited. It can be a continuous curve or a broken line with multiple segments connected at one time, as long as it can effectively improve the rigidity of the cutting tooth 2 when the blade edge 201 is sharper.

[0075] In this embodiment, the direction of the notch of the cutting groove 3 toward 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. Since the cutting angles at different positions of the cutting tooth 2 are different, their rigidity is also different, and the size of the cutting angle will directly affect the rigidity of the cutting tooth 2 at that position. In order to ensure the overall rigidity of the cutting tooth 2, the cutting angle changes continuously along the first direction. At the position where the rigidity of the cutting tooth 2 is insufficient, the cutting angle is larger, and at the position where the rigidity of the cutting tooth 2 is higher, the cutting angle can be smaller.

[0076] The opening of the cutting groove 3 refers to the position of the cutting groove 3 close to the end of the cutting tooth 2 , and the bottom of the cutting groove 3 refers to the position of the cutting groove 3 close to the root of the cutting tooth 2 .

[0077] Specifically, the cutting angle varies in a range of 5° to 75°.

[0078] In this embodiment, the cutting angle corresponding to each point on the blade edge 201 gradually decreases along the first direction. When the rigidity of the cutting tooth 2 as a whole gradually decreases along the first direction, the cutting angle of the notch near the cutting groove 3 is larger, ensuring the rigidity of the end of the cutting tooth 2, while the rigidity near the root of the cutting tooth 2 is larger. At this time, the cutting angle near the bottom of the cutting groove 3 can be smaller, making this place sharper. While ensuring the overall rigidity of the cutting tooth 2 as much as possible, the cutting angle of the blade edge 201 is made as small as possible, so that the blade edge 201 is kept as sharp as possible.

[0079] In this embodiment, the cutting angle corresponding to each point on the blade edge 201 gradually decreases and then gradually increases along the first direction.

[0080] Specifically, as shown in Figures 6, 8 and 10, they are cross-sections of the cutting tooth 2 at different positions along the first direction. When the end of the cutting tooth 2 is thicker, the rigidity of the cutting tooth 2 along the first direction changes to first smaller and then larger. Therefore, this setting of the cutting angle can ensure the overall rigidity of the cutting tooth 2 while keeping the blade edge 201 as sharp as possible.

[0081] In this embodiment, the blade edge 201 is a continuous curve, which can effectively reduce the stress concentration phenomenon at the blade edge 201 to ensure the rigidity of the blade edge 201 .

[0082] Specifically, at least one section of the contour of the wall of the cutting groove 3 in the direction parallel to the shear plane is set to be parabolic, and correspondingly, at least one section of the blade edge 201 is also parabolic. Such a smoothly transitioned wall of the cutting groove 3 can ensure the rigidity of the blade, especially the rigidity of each point on the periphery of the cutting groove 3. Similarly, it can also hinder the discharge of hair to a certain extent, thereby improving the efficiency of hair cutting.

[0083] In this embodiment, the tooth groove line 301 is a continuous curve to ensure that the wall surface of the cutting groove 3 transitions smoothly in the extension direction of the tooth groove line 301 , thereby ensuring the rigidity there.

[0084] Specifically, the tooth groove line 301 is a plurality of continuous arcs. Optionally, the slope of the tooth groove line 301 in the corresponding cross section changes continuously. Taking the XY coordinate system in Figure 12 or Figure 13 as an example, from the bottom surface to the top surface of the cutting tooth 2, the slope k of the tooth groove line 301 has at least one section that increases rapidly between k=tan5° and k=tan75°. The thickness of the cutting tooth 2 increases rapidly in the direction of travel from the bottom surface to the top surface. This change is nonlinear. Therefore, when the corresponding blade edge 201 is made very sharp, for example, when the blade cutting angle is as small as 5°, the thickness of other parts of the cutting tooth 2 can be rapidly increased, effectively improving the overall rigidity of the blade.

[0085] In this embodiment, the direction of the bottom of the cutting groove 3 toward the notch of the cutting groove 3 is the second direction, and the width of the cutting groove 3 first increases and then decreases along the second direction. The width at the notch of the cutting groove 3 is smaller, and the hair entering the cutting groove 3 will be restricted by the notch of the cutting groove 3. It can ensure that the hair entering the cutting groove 3 is effectively cut before being discharged, further improving the hair cutting efficiency.

[0086] Specifically, as shown in Figure 14, the direction indicated by the arrow is the direction in which the hair is subjected to force. The shape of the cutting groove on the left is in the related art, which is V-shaped as a whole. The cutting groove of this structure will push the uncut hair entering the cutting groove 3 outwards during operation, thereby affecting the shearing efficiency; the shape of the cutting groove 3 on the right is the shape of the present embodiment. The cutting groove 3 of this embodiment is a closed-end type as a whole, and the slopes of the tangents at each point on the blade edge 201 are different. The cutting groove 3 as a whole has a tendency to accommodate hair. The cutting groove 3 of this embodiment will push the uncut hair entering the cutting groove 3 toward the center of the cutting groove 3 during operation. Compared with the cutting groove in the related art, the cutting groove 3 of this embodiment can ensure that the hair entering the cutting groove 3 is more fully cut.

[0087] It should be noted that the shape of the cutting groove 3 on the right side of Figure 14 is only a schematic diagram of the shape of the cutting groove 3 in the embodiment. The side wall of the cutting groove 3 is not limited to the degree of curvature shown in the figure. The degree of curvature of the side wall of the cutting groove 3 can also be less than or greater than the degree of curvature shown in the figure, as long as it can form a closing and improve the receiving and sending effect.

[0088] It can be understood that as an alternative embodiment, the blade edge 201 can also be U-shaped. In order to further improve the rigidity of the cutting tooth, the wall surface of the cutting groove 3 is a continuous curved surface or a continuous arc surface surrounding the blade edge 201; when the wall surface of the cutting groove 3 is a continuous arc surface or a curved surface surrounding the blade edge 201, the contour of the blade edge 201 can also be parabolic, superior arc or arched, etc., which can meet the use requirements.

[0089] In this embodiment, as shown in FIG15 , the end of the cutting tooth 2 may be configured to be outwardly expanded. The end of the cutting tooth 2 with this structure can guide the hair into the cutting groove 3, further improving the efficiency of hair cutting.

[0090] The shaving blade of this embodiment can be used in personal care, hairdressing, pet, medical and other fields. The shaving blade can be used on a rotary razor or a reciprocating razor. Optionally, the shaving blades shown in the accompanying drawings are all reciprocating shaving blades. Since the main improvement of this application lies in the cutting tooth part, the cutting tooth structure of this embodiment can be applied to both rotary blades and reciprocating blades. The rotary shaving blade will not be described in detail here.

[0091] According to an embodiment of the present application, on the other hand, a method for manufacturing a shaving blade is provided, for manufacturing the above-mentioned shaving blade, comprising:

[0092] A blade body 1 is manufactured; cutting teeth 2 are formed on the blade body 1 by a cutting wheel 4;

[0093] Among them, the diameter of the cutting wheel 4 is less than or equal to 80 mm, and a cutting groove 3 is formed between two adjacent cutting teeth 2. The wall of the cutting groove 3 extends from the lower end face of the cutting tooth toward the upper end face of the cutting tooth and forms a continuous curved surface. The wall of the cutting groove 3 intersects with the plane perpendicular to the lower end face to form a tooth groove line 301. The slope of each point on the tooth groove line 301 relative to the lower end face gradually increases in the direction away from the blade edge 201.

[0094] In this embodiment, in the step of cutting the cutting teeth 2 on the blade body 1 by the cutting wheel 4, the cutting angle corresponding to any point on the edge 201 of the cutting tooth 2 is less than 75°.

[0095] Specifically, in the related art, a cutting wheel 4 with a larger diameter or stamping is usually used to process the cutting teeth 2. When a cutting wheel 4 with a larger diameter is used for processing, the cutting angles of the middle part and the notch part of the cutting groove 3 are generally above 80°, and the sharpness is poor. When stamping is used for processing, the side walls of the cutting groove 3 are generally flat, and the slope of the tooth groove line 301 cannot be changed. At the same time, the punching sharp angle has very high requirements for the mold, and the punch becomes a consumable part, the processing cost is high, and the quality is prone to problems. Therefore, the cost of stamping sharp angles is much higher than the cost of cutting teeth with a cutting wheel 4; compared with the manufacturing method in the related art, the cutting wheel 4 used in the manufacturing method of this embodiment has a smaller diameter, which can process the cutting angle to a smaller value, and can also make the inner wall of the cutting groove 3 and the blade edge 201 have a certain curvature.

[0096] Furthermore, there is no limitation on the specific type of the cutting wheel 4 as long as it can perform reliable cutting operations.

[0097] Optionally, the diameter of the cutting wheel 4 is greater than or equal to 17 mm and less than or equal to 80 mm, and the cutting wheel 4 is a grinding wheel.

[0098] In this embodiment, in the step of cutting the cutting teeth 2 on the blade 1 by the cutting wheel 4,

[0099] The cutting wheel 4 cuts to form a cutting groove 3 on the blade body 1, and a cutting tooth 2 is formed between any two adjacent cutting grooves 3. The cutting wheel 4 is fed from the bottom of the cutting groove 3 toward the groove mouth of the cutting groove 3. The cutting wheel 4 is tilted toward the lower end of the end of the cutting tooth 2 during the feeding process, and / or the rotation speed of the cutting wheel 4 is 5000 r / min to 3000 r / min, and the cutting feed speed of the cutting wheel 4 is 0.1 mm / min to 10 mm / min.

[0100] Specifically, the tooth profile is finely cut using high-precision CNC external cylindrical grinding equipment. The edge profile of the product after fine cutting forms an inverted hook, the cross-sectional width of the tooth tip is larger than the middle cross-sectional width of the tooth profile, and the cutting wheel starts grinding from the upper surface of the blank. The feed direction of the cutting wheel is toward the slot and inclined toward the lower end edge of the toothed front edge. The tooth profile width dimensional consistency is within 0.05mm, and the tooth depth dimensional consistency is within 0.15mm.

[0101] In this embodiment, the steps of manufacturing the blade 1 include:

[0102] Prepare a blank; process the blank into a blade 1 according to the appearance size of the blade 1.

[0103] Specifically, the size specification of the blank of this embodiment is based on a metal sheet with a thickness of 2mm. The blank is formed into a blade 1 by stamping and blanking. The stamping adopts a high-precision continuous die to perform fine blanking processing on the product shape and circular holes. The punching machine uses a 160T high-precision equipment to complete the processing. The outer dimensions of the stamped blank are 33*36*2mm. In actual production, the production efficiency can reach about 10,000 to 15,000 per shift. In the tooth profile processing of the subsequent process, in this step, two tooth profile auxiliary schemes can be used: blanking without cutting or preliminary rough processing of cutting. When the teeth are preliminarily rough-cut, the punching function is added to the stamping die to roughly cut the product tooth shape. Compared with the cutting tooth shape, a cutting allowance of more than 0.1mm is reserved on one side of the blanking tooth shape to reduce the cutting pressure and improve the tooth cutting efficiency.

[0104] Optionally, the surface of the blank is smooth, without defects, pitting, oil stains or scratches.

[0105] In this embodiment, the steps of preparing the blank include:

[0106] The hardness of the blank is obtained; if the hardness of the blank is greater than or equal to the preset hardness, the blank is formed into the blade body 1; if the hardness of the blank is less than the preset hardness, the blank is heat treated to form the blade body 1.

[0107] In this embodiment, if the hardness of the blank is less than the preset hardness, the step of heat treating the blank includes:

[0108] The blank is placed in a heat treatment device, and the heat treatment temperature range of the heat treatment device is 850℃ to 1300℃, and the holding time is greater than or equal to 30min; the blank is cooled to a preset temperature range and then taken out from the heat treatment device, and the preset temperature range is room temperature to 65℃.

[0109] Specifically, the heat treatment is a vacuum heat treatment. The blank is placed in a heat treatment furnace for vacuum heat treatment. The furnace temperature is between 1200±5℃, the holding time is 35min, and nitrogen is used for rapid cooling. The blank is taken out of the furnace when the cooling temperature is between 40 and 60℃. Precise setting control is performed: the above heat treatment processing parameters will be input into the heat treatment control system, and the equipment will complete the processing according to the input processing parameters. After such settings, the hardness is precisely controlled and stable. For example, the hardness of 420J2 material can be controlled between HRC52 and HRC56. In this step, the production efficiency can process about 15,000 pieces per furnace. The use of vacuum heat treatment can ensure that the hardness and deformation of the product are in an ideal state, ensuring product consistency.

[0110] Specifically, after the blank is formed into the blade body 1, it needs to be rough-polished to remove surface burrs. A centrifugal rolling polishing device is used for polishing. The cutting wheel 4 rotates at a speed of 40 to 70 r / min. The production efficiency in this step is about 10,000 pieces per shift.

[0111] In this embodiment, after the step of cutting the cutting teeth 2 on the blade 1 by the cutting wheel 4, the following steps are further included:

[0112] The surface of the cutting teeth is ground so that the flatness and surface roughness of the surface of the cutting teeth 2 reach the preset flatness and preset surface roughness.

[0113] Specifically, grinding includes surface fine polishing and tooth surface fine grinding. Surface fine polishing uses fine polishing equipment to remove burrs on the product tooth shape. The fine polishing equipment is a centrifugal roller polishing equipment. The specific polishing machine has a roller speed of 40 to 70 r / min. Tooth surface fine grinding is mainly for grinding the blade surface. Blade surface fine grinding uses high-precision CNC grinding equipment for grinding production. The high-precision CNC grinding equipment is a high-precision 910 CNC grinding equipment, which includes three processes: rough grinding, semi-finishing grinding, and fine grinding. The shear surface grinding flatness can be controlled within 0.01, the height difference of the shear surface tooth position grinding surface, that is, the straightness tolerance can be controlled within ±0.008, and the grinding surface roughness can be controlled at about Ra0.06.

[0114] In this embodiment, after the grinding step, cleaning, drying and appearance inspection are required. During the cleaning and drying process, ultrasonic cleaning is used to remove stains remaining on the surface of the product from grinding. During the appearance inspection, manual visual inspection is used to pick out products with defective appearance to ensure that the finished product has no broken teeth, crooked teeth, indentations, scratches, rust, stains, deformation, etc.

[0115] The following describes the entire process of the manufacturing method of the shaving blade of this embodiment using a metal sheet having a thickness of 2.8 mm as a blank:

[0116] Step 1: Prepare the material. Prepare a metal sheet with a thickness of 2.8mm. The surface must be smooth, without defects, pitting, oil stains, or scratches.

[0117] Step 2: Stamping and blanking. High-precision progressive dies are used for fine blanking of the product's shape and circular holes. A 160T high-precision punch press completes the process. The dimensions of the blank are 33*36*2.8mm. Similarly, in conjunction with subsequent tooth profile processing, this step can be used as a blanking aid without cutting, or as a preliminary roughing step for the cut teeth. Similarly, when adding a punching function to the stamping die for rough cutting of the product's tooth profile, a cutting allowance of at least 0.1mm is reserved on each side of the blanked tooth profile compared to the cut tooth profile to reduce cutting pressure and improve cutting efficiency.

[0118] Step 3: Vacuum heat treatment: Place the blank obtained in step 2 in a heat treatment furnace for vacuum heat treatment at a temperature of 900±5℃ for 55 minutes. Use nitrogen for rapid cooling and remove from the furnace when the cooling temperature reaches 50℃±5℃. Precise setting and control: The above heat treatment processing parameters will be input into the heat treatment control system. The equipment will complete the processing according to the input processing parameters. The hardness is precisely controlled and stable during the processing process.

[0119] Step 4: Roughly polish the surface using a centrifugal rolling polishing device, with the cutting wheel 4 rotating at a speed of 40 to 70 r / min.

[0120] Step 5: Fine-cutting the tooth profile. This is accomplished using high-precision CNC cylindrical grinding equipment. The diameter of the cutting wheel 4 ranges from 17 to 80 mm. The cutting wheel 4 rotates at a speed of 600 to 1000 rpm, with a feed rate of 10 mm / min. The resulting cutting edge angle ranges from 5° to 75°. The cutting wheel 4 can be fed either toward the notch and angled toward the lower edge of the toothed leading edge, as in the previous embodiment, or from the notch toward the bottom of the groove. Similarly, the tooth width consistency is within 0.05 mm, and the tooth depth consistency is within 0.15 mm.

[0121] Step 6: Surface polishing: Use a polishing device to remove the tooth burrs of the product. The polishing device is a centrifugal roller polishing device, and the specific roller speed of the polishing machine is 40 to 70 r / min.

[0122] Step 7: Fine grinding of the tooth surface and blade surface is performed using high-precision CNC grinding equipment. The high-precision CNC grinding equipment is a high-precision 910 CNC grinding equipment. It includes three processes: rough grinding, semi-finishing grinding, and fine grinding. The flatness of the shear surface grinding is controlled within 0.01. The height difference of the grinding surface at the tooth profile position of the shear surface is controlled within ±0.008, and the grinding surface roughness can be controlled to around Ra0.06.

[0123] Step 8: Cleaning and drying: Use ultrasonic cleaning to remove stains remaining on the surface of the product.

[0124] Step 9: Appearance inspection, using manual visual inspection to pick out products with broken teeth, crooked teeth, indentations, scratches, rust, stains, deformation and other appearance defects.

[0125] Although the embodiments of the present application have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A shaving blade, characterized in that: include: Blade (1); A plurality of cutting teeth (2) are arranged at intervals on the blade body (1), a cutting groove (3) is formed between two adjacent cutting teeth (2), and a wall surface of the cutting groove (3) extends from the lower end surface of the cutting tooth toward the upper end surface of the cutting tooth to form a continuous curved surface.

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

3. The shaving blade according to claim 1 or 2, characterized in that The intersection of the wall surface of the cutting groove (3) and the lower end surface of the cutting tooth (2) forms a blade edge (201); the angle formed by the tangent line at any point on the blade edge (201) and the lower end surface is the cutting angle; the wall surface of the cutting groove (3) intersects with a plane perpendicular to the lower end surface to form a tooth groove line (301); the slope of each point on the tooth groove line (301) relative to the lower end surface gradually increases in a direction away from the blade edge (201), so that the cutting tooth (2) remains sharp and has a corresponding thickness.

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 notch of the cutting groove (3) towards the groove 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 shaving blade according to claim 5, characterized in that The cutting angle corresponding to each point on the blade edge (201) gradually decreases along the first direction, Alternatively, the cutting angle corresponding to each point on the blade edge (201) first gradually decreases and then gradually increases along the first direction.

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, for manufacturing the razor blade according to any one of claims 1 to 7, characterized in that: The manufacturing method comprises: Making a blade (1); Cutting teeth (2) are formed on the blade body (1) by cutting with a cutting wheel (4); The diameter of the cutting wheel (4) is less than or equal to 80 mm, a cutting groove (3) is formed between two adjacent cutting teeth (2), and the wall surface of the cutting groove (3) extends from the lower end surface of the cutting tooth toward the upper end surface of the cutting tooth to form a continuous curved surface.

9. The method for manufacturing a razor blade according to claim 8, characterized in that: In the step of forming the cutting teeth (2) by cutting the blade (1) with the cutting wheel (4), The cutting wheel (4) cuts the cutting groove (3) on the blade (1), and 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 notch of the cutting groove (3), and the cutting wheel (4) is tilted toward the lower end of the end of the cutting teeth (2) during the feeding process. And / or, the rotation speed of the cutting wheel (4) is 5000 r / min to 3000 r / min, and the cutting feed speed of the cutting wheel (4) is 0.1 mm / min to 10 mm / min.

10. The method for manufacturing a razor blade according to claim 8 or 9, characterized in that: The steps of making the blade (1) include: Prepare the blank; The blank is processed according to the appearance dimensions of the blade (1) to form the blade (1).

11. The method for manufacturing a razor blade according to claim 10, characterized in that: The steps of preparing the blank include: Obtaining the hardness of the blank; If the hardness of the blank is greater than or equal to a preset hardness, the blank forms the blade (1); If the hardness of the blank is less than the preset hardness, the blank is heat treated to form the blade body (1).

12. The method for manufacturing a razor blade according to claim 11, characterized in that: If the hardness of the blank is less than the preset hardness, the step of heat treating the blank comprises: Placing the blank in a heat treatment device, wherein the heat treatment device performs heat treatment on the blank at a temperature ranging from 850° C. to 1300° C. and a holding time greater than or equal to 30 minutes; The blank is taken out from the heat treatment equipment after being cooled to a preset temperature range, wherein the preset temperature range is from room temperature to 65°C.

13. The method for manufacturing a razor blade according to claim 8 or 9, characterized in that: After the step of cutting the cutting teeth (2) on the blade (1) by the cutting wheel (4), the method further comprises: The surface of the cutting tooth is ground so that the flatness and surface roughness of the surface of the cutting tooth (2) reach a preset flatness and a preset surface roughness.

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