Shaving blade and method of manufacturing the same

Abstract

The present application relates to the technical field of shaving razor, discloses a shaving razor blade and a manufacturing method thereof, the shaving razor blade comprising: a blade body; a plurality of cutting teeth, which are arranged on the blade body at intervals, and a cutting groove is formed between two adjacent cutting teeth, and the intersection of the wall surface of the cutting groove and the lower end surface of the cutting tooth forms an edge, the slope of the tooth groove line is set to gradually increase along the direction away from the edge, and the slope of the part of the tooth groove line close to the edge is smaller, so that the edge is sharper, and when the cutting tooth extends from the bottom surface to the top surface, the tooth width of the cutting tooth changes nonlinearly, and the reduction speed of the tooth width is slower, so that the two side walls of the cutting tooth do not intersect too early, the tooth width of the middle and upper parts of the cutting tooth is wider, and the overall tooth thickness is thicker, so that the rigidity of the cutting tooth as a whole is higher, so that the cutting angle of the cutting tooth can be very small, and the rigidity of the cutting tooth can be ensured at the same time, and the problem that the existing shaving razor blade cannot balance the sharpness and the rigidity is effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shaving razors, in particular to a shaving razor blade and a manufacturing method thereof. BACKGROUND

[0002] The shaving razor blade is a main working component of a shaver or a shaver, and the existing shaver or shaver mainly includes a rotary type and a reciprocating type. The shaving razor blade rotates or swings in the head of the shaver or shaver, so that the shaving razor blade moves relative to the fixed razor net to cut the hair entering between the shaving razor blade and the fixed razor net. The cutting end of the shaving razor blade is usually provided with a plurality of cutting teeth at intervals. The sharpness of the cutting edge of the cutting tooth and the shape of the cutting tooth greatly affect the cutting effect of the hair.

[0003] At present, the cutting angle of the existing cutting tooth is generally greater than 80°. The intersection of the two side walls of the cutting tooth and the bottom surface of the shaving razor blade forms a cutting edge. The angle at the cutting edge is the cutting angle. If the sharpness of the cutting edge is to be improved, the angle of the cutting angle needs to be reduced. Since the side wall of the cutting tooth is generally an inclined plane, the inclination of the side wall of the cutting tooth will change accordingly when the cutting angle is reduced. When the cutting angles of the two sides of the same cutting tooth are reduced at the same time, the intersection position of the two side walls of the cutting tooth will be lower and lower, and the thickness of the cutting tooth will also decrease, thereby it is difficult to ensure the rigidity of the cutting tooth. At this time, the cutting tooth is more sharp, but it is easy to jump during use. Therefore, the existing shaving razor blade still has the problem of being difficult to balance the sharpness and rigidity. SUMMARY

[0004] Therefore, the present application provides a shaving razor blade and a manufacturing method thereof to solve the problem that the existing shaving razor blade is difficult to balance the sharpness and rigidity.

[0005] In a first aspect, the present application provides a shaving razor blade, comprising: a blade body; a plurality of cutting teeth arranged at intervals on the blade body, and a cutting groove formed between adjacent two cutting teeth. The intersection of the wall surface of the cutting groove and the lower end surface of the cutting tooth forms a cutting edge. The included angle between the tangent line of any point on the cutting edge and the lower end surface is the cutting angle. The intersection of the wall surface of the cutting groove and the plane perpendicular to the lower end surface forms a tooth groove line. The slope of each point on the tooth groove line with respect to the lower end surface gradually increases along the direction away from the cutting edge, so that the cutting tooth remains sharp while having a corresponding thickness.

[0006] In an optional embodiment, the cutting angle corresponding to any point on the cutting edge is less than 75°.

[0007] In an optional embodiment, the direction of the slot opening of the cutting groove towards the groove bottom is the first direction, and the cutting angle corresponding to each point on the cutting edge continuously changes along the first direction.

[0008] In an alternative embodiment, the cutting angle corresponding to each point on the edge gradually decreases along the first direction, or the cutting angle corresponding to each point on the edge gradually decreases and then gradually increases along the first direction.

[0009] In an alternative embodiment, the edge is a continuous curve.

[0010] In an alternative embodiment, the tooth groove line is a continuous curve.

[0011] In an alternative embodiment, the tooth groove line is a plurality of continuous arcs.

[0012] In a second aspect, the present application further provides a manufacturing method of a shaving blade, for manufacturing the shaving blade described above, the manufacturing method comprising:

[0013] manufacturing a blade body; and forming cutting teeth 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 any two adjacent cutting teeth, the wall surface of the cutting groove intersects with a plane perpendicular to the lower end surface to form a tooth groove line, and the slope of each point on the tooth groove line with respect to the lower end surface gradually increases along a direction away from the edge.

[0014] In an alternative embodiment, in the step of forming the cutting teeth on the blade body by cutting with the cutting wheel,

[0015] the cutting angle corresponding to any point on the edge of the cutting tooth is less than 75°.

[0016] In an alternative embodiment, in the step of forming the cutting teeth on the blade body by cutting with the cutting wheel,

[0017] the cutting wheel forms the cutting groove on the blade body, any two adjacent cutting grooves form a cutting tooth, the cutting wheel feeds from the groove bottom to the groove opening of the cutting groove, the cutting wheel is inclined toward the lower end of the end portion of the cutting tooth during the feeding process, and / or the rotation speed of the cutting wheel is 5000 r / min to 3000 r / min, and the cutting feed speed of the cutting wheel is 0.1 mm / min to 10 mm / min.

[0018] In an alternative embodiment, the step of manufacturing the blade body comprises:

[0019] preparing a blank; and processing the blank according to the appearance size of the blade body to form the blade body.

[0020] In an alternative embodiment, the step of preparing the blank comprises:

[0021] 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 body; and if the hardness of the blank is less than the preset hardness, the blank is heat treated to form the blade body.

[0022] In an alternative embodiment, if the hardness of the blank is less than the preset hardness, the step of heat treating the blank comprises:

[0023] placing the blank in a heat treatment device, the heat treatment device performing heat treatment on the blank at a heat treatment temperature ranging from 850 DEG C to 1300 DEG C and a holding time greater than or equal to 30 min; and taking the blank out of the heat treatment device after cooling the blank to a preset temperature range, the preset temperature range being room temperature to 65 DEG C.

[0024] In an alternative embodiment, the step of forming the cutting tooth on the blade by cutting with the cutting wheel further comprises:

[0025] grinding the surface of the cutting tooth to make the flatness and surface roughness of the surface of the cutting tooth reach a preset flatness and a preset surface roughness.

[0026] Advantages:

[0027] 1. The slope of the tooth groove line is set to gradually increase in the direction away from the blade edge, the slope of the part of the tooth groove line close to the blade edge is smaller, so that the blade edge is sharper, and when the cutting tooth extends from the bottom surface to the top surface, the tooth width of the cutting tooth changes nonlinearly, and the reduction speed of the tooth width is slower, so that the two side walls of the cutting tooth do 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 thicker, so that the rigidity of the cutting tooth as a whole is higher, which can make the cutting angle of the cutting tooth very small while ensuring the rigidity of the cutting tooth, effectively solving the problem that the existing shaving blade cannot balance sharpness and rigidity.

[0028] 2. Since the cutting angles of different positions of the cutting tooth are different, the rigidity of the cutting tooth is also different, and the size of the cutting angle directly affects the rigidity of the cutting tooth at the position, in order to ensure the rigidity of the cutting tooth as a whole, the cutting angle continuously changes along the first direction, the angle of the cutting angle is larger at the position where the rigidity of the cutting tooth is insufficient, and the angle of the cutting angle can be smaller at the position where the rigidity of the cutting tooth is higher.

[0029] 3. The tooth groove line is a continuous curve, which can ensure that the wall surface of the cutting groove smoothly transitions in the extension direction of the tooth groove line, reduces stress concentration, and ensures the rigidity of the wall surface of the cutting groove. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments or the prior art. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0031] Figure 1 A three-dimensional schematic view of a shaving blade according to an embodiment of the present application;

[0032] Figure 2 A three-dimensional schematic view of a shaving blade according to an embodiment of the present application; Figure 1 An enlarged schematic view of A of the shaving blade shown in FIG. 1;

[0033] Figure 3 A front view of the shaving blade shown in FIG. 1; Figure 1 A front view of the shaving blade shown in FIG. 1;

[0034] Figure 4 A top view of the shaving blade shown in FIG. 1; Figure 1 A top view of the shaving blade shown in FIG. 1;

[0035] Figure 5 A sectional view of B-B of the shaving blade shown in FIG. 1; Figure 4 A sectional view of B-B of the shaving blade shown in FIG. 1;

[0036] Figure 6 A sectional view of B-B of the shaving blade shown in FIG. 1; Figure 5 A sectional view of B-B of the shaving blade shown in FIG. 1;

[0037] Figure 7 A sectional view of C-C of the shaving blade shown in FIG. 1; Figure 4 A sectional view of C-C of the shaving blade shown in FIG. 1;

[0038] Figure 8 A sectional view of C-C of the shaving blade shown in FIG. 1; Figure 7 A sectional view of C-C of the shaving blade shown in FIG. 1;

[0039] Figure 9 A sectional view of D-D of the shaving blade shown in FIG. 1; Figure 4 A sectional view of D-D of the shaving blade shown in FIG. 1;

[0040] Figure 10 A sectional view of D-D of the shaving blade shown in FIG. 1; Figure 9 A sectional view of D-D of the shaving blade shown in FIG. 1;

[0041] Figure 11 A comparison view of the cutting angle of the cutting tooth of the shaving blade shown in FIG. 1 when the angle is large; Figure 1 A comparison view of the cutting angle of the cutting tooth of the shaving blade shown in FIG. 1 when the angle is large; A comparison view of the cutting angle of the cutting tooth of the shaving blade shown in FIG. 1 when the angle is large;

[0042] A comparison view of the cutting angle of the cutting tooth of the shaving blade shown in FIG. 1 when the angle is large; Figure 12 A comparison view of the cutting angle of the cutting tooth of the shaving blade shown in FIG. 1 when the angle is large; Figure 1 A comparison view of the cutting angle of the cutting tooth of the shaving blade shown in FIG. 1 when the angle is large; A comparison view of the cutting angle of the cutting tooth of the shaving blade shown in FIG. 1 when the angle is large;

[0043] A comparison view of the cutting angle of the cutting tooth of the shaving blade shown in FIG. 1 when the angle is large; Figure 13 A comparison view of the cutting angle of the cutting tooth of the shaving blade shown in FIG. 1 when the angle is large; Figure 1 A comparison view of the cutting angle of the cutting tooth of the shaving blade shown in FIG. 1 when the angle is large; A comparison view of the cutting angle of the cutting tooth of the shaving blade shown in FIG. 1 when the angle is large;

[0044] A comparison view of the cutting angle of the cutting tooth of the shaving blade shown in FIG. 1 when the angle is large; Figure 14 A comparison view of the cutting angle of the cutting tooth of the shaving blade shown in FIG. 1 when the angle is large; Figure 1 A comparison view of the cutting angle of the cutting tooth of the shaving blade shown in FIG. 1 when the angle is large; A comparison view of the cutting angle of the cutting tooth of the shaving blade shown in FIG. 1 when the angle is large;

[0045] Figure 15 A schematic view of a preliminary cut of a shaving blade manufacturing method according to an embodiment of the present application;

[0046] Figure 16 A schematic view of a further cut of a shaving blade manufacturing method according to an embodiment of the present application; Figure 15 A schematic view of a further cut of a shaving blade manufacturing method according to an embodiment of the present application;

[0047] Figure 17 A schematic view of a further cut of a shaving blade manufacturing method according to an embodiment of the present application; Figure 16 A schematic view of a further cut of a shaving blade manufacturing method according to an embodiment of the present application;

[0048] Figure 18 A schematic view of a further cut of a shaving blade manufacturing method according to an embodiment of the present application; Figure 17 A schematic view of a further cut of a shaving blade manufacturing method according to an embodiment of the present application;

[0049] Figure 19 A schematic view of a further cut of a shaving blade manufacturing method according to an embodiment of the present application; Figure 18 A schematic view of a further cut of a shaving blade manufacturing method according to an embodiment of the present application;

[0050] Figure 20 A schematic view of a further cut of a shaving blade manufacturing method according to an embodiment of the present application; Figure 19 A schematic view of a further cut of a shaving blade manufacturing method according to an embodiment of the present application;

[0051] Figure 21 A schematic view of a further cut of a shaving blade manufacturing method according to an embodiment of the present application. Figure 20 A schematic view of a further cut of a shaving blade manufacturing method according to an embodiment of the present application.

[0052] BRIEF DESCRIPTION OF DRAWINGS

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

[0054] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0055] The embodiments of the present application are described below with reference to the drawings. Figures 1 to 21

[0056] ​According to an embodiment of the present application, in one aspect, a shaving blade is provided, comprising: a blade body 1 and a plurality of cutting teeth 2, the plurality of cutting teeth 2 are arranged on the blade body 1 at intervals, and a cutting groove 3 is formed between any two adjacent cutting teeth 2, an intersection between a wall surface of the cutting groove 3 and a lower end surface of the cutting tooth 2 forms an edge 201, an included angle between a tangent line of any point on the edge 201 and the lower end surface is a 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, and a slope of each point on the tooth groove line 301 with respect to the lower end surface gradually increases in a direction away from the edge 201, so that the cutting tooth 2 remains sharp while having a corresponding thickness.

[0057] By using the shaving blade of the present embodiment, the slope of the tooth groove line 301 is set to gradually increase in the direction away from the edge 201, and the slope of the tooth groove line 301 near the edge 201 is small, so that the edge 201 is sharper, and 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 reduction speed of the tooth width is slower, so that the two side walls of the cutting tooth 2 do not intersect too early. Compared with the cutting tooth 2 in the related art, the middle and upper parts of the cutting tooth 2 of the present embodiment have a wider tooth width and a thicker overall tooth thickness, 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 sharpness and rigidity of the existing shaving blade are difficult to balance.

[0058] Specifically, in the related art, in order to ensure that the cutting tooth 2 has a certain thickness, the cutting angle of the cutting tooth 2 is generally greater than 80°, and the side wall of the cutting tooth 2 is approximately perpendicular to the bottom surface of the cutting tooth 2, so that the edge 201 at the side wall of the cutting groove 3 is not sharp enough, and only the edge 201 of the part of the cutting groove 3 near the groove bottom is relatively sharp. When cutting hair, due to the insufficient sharpness of the bottom of the side wall of the cutting tooth 2, the hair is mainly cut by the part of the cutting groove 3 near the groove bottom, and the hair cutting effect of this form of cutting tooth 2 is poor. The shaving blade of the present embodiment can make the edge 201 at the side wall of the cutting groove 3 also relatively sharp, so that the entire edge 201 can effectively cut the hair, greatly improving the hair cutting effect.

[0059] The side wall of the cutting tooth 2 is the side wall of the cutting groove 3, which refers to the wall surface in the cutting groove 3 located on both sides. Figure 3 The width of a single cutting tooth 2 in the "left-right" direction as indicated by the arrow in the middle, and the thickness of the cutting tooth 2 refers to the thickness of a single cutting tooth 2 in the "up-down" direction as indicated by the arrow in the middle. Figure 3 The width of a single cutting tooth 2 in the "left-right" direction as indicated by the arrow in the middle, and the thickness of the cutting tooth 2 refers to the thickness of a single cutting tooth 2 in the "up-down" direction as indicated by the arrow in the middle.

[0060] In the embodiment, the cutting angle of any point on the blade edge 201 is less than 75°, the blade edge 201 can keep sharp as a whole, the hair just contacts the blade edge 201 after entering the cutting groove 3, and then the cutting is started, a part of the hair which is not cut contacts the blade edge 201 in the middle of the cutting groove 3 to complete the cutting, the remaining hair contacts the blade edge 201 at the bottom of the cutting groove 3 to complete the cutting, and the hair entering the cutting groove 3 can be completely cut.

[0061] Further, as shown in Figure 12 and Figure 13 , which are cross sections perpendicular to the extension direction of the cutting tooth 2, Figure 12 is the case when the cutting angle is large, Figure 13 is the case when the cutting angle is small, wherein the solid line part is the cutting tooth 2 with the nonlinear tooth groove line 301 in the embodiment, the dotted line part is the cutting tooth 2 with the nonlinear tooth groove line 301 in the related art, and α is the cutting angle, X is the tooth width, and Y is the tooth thickness. The extension direction of the cutting tooth 2 is the direction perpendicular to the “up and down” direction and the “left and right” direction indicated by the arrow in Figure 3 .

[0062] The tooth thickness of the cutting tooth 2 will be described as follows:

[0063] Figure 12 In the case of the cutting angle of 70.2°, the change of the nonlinear and linear tooth thickness is shown in Table 1,

[0064] Tooth width Non-linear tooth thickness Linear tooth thickness 1.06 0 0 0.79 0.42 0.38 0.46 1.04 0.84 0.23 1.63 1.16

[0065] Table 1

[0066] Figure 13 In the case of the cutting angle of 36.5°, the change of the nonlinear and linear tooth thickness is shown in Table 2,

[0067] Tooth width Non-linear tooth thickness Linear tooth thickness 0.44 0 0 0.33 0.05 0.04 0.26 0.11 0.07 0.2 0.22 0.09

[0068] Table 2

[0069] From the above data, it can be seen that when the tooth width is consistent, the thickness of the cutting tooth 2 with the nonlinear tooth groove line 301 is greater than the thickness of the cutting tooth 2 with the linear tooth groove line 301, so the rigidity of the cutting tooth 2 with the nonlinear tooth groove line 301 is higher, and this phenomenon is more significant as the angle of the cutting angle becomes smaller. The structural advantage of the cutting tooth 2 in the embodiment is more obvious when the blade edge 201 is sharper.

[0070] The specific data of the tooth width and the tooth thickness are not limited to units, and the proportion is sufficient; the above table and data are examples of the non-linear tooth groove line 301 structure of the embodiment and are not limited to the above proportion, which can be adjusted as required.

[0071] It should be noted that the specific change of the non-linear change of the tooth groove line 301 in the embodiment is not limited, which can be a continuous curve or a polyline connected by multiple segments, and can effectively improve the rigidity of the cutting tooth 2 when the blade edge 201 is relatively sharp.

[0072] In the embodiment, the direction of the slot opening of the cutting groove 3 towards the groove bottom of the cutting groove 3 is the first direction, and the cutting angle corresponding to each point on the blade edge 201 continuously changes along the first direction. Since the angles of the cutting angles at different positions of the cutting tooth 2 are different, the rigidity is also different, and the size of the cutting angle directly affects the rigidity of the cutting tooth 2 at the position. In order to ensure the overall rigidity of the cutting tooth 2, the cutting angle continuously changes along the first direction. The angle of the cutting angle is larger at the position where the rigidity of the cutting tooth 2 is insufficient, and the angle of the cutting angle can be smaller at the position where the rigidity of the cutting tooth 2 is higher.

[0073] The slot 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 groove bottom of the cutting groove 3 refers to the position of the cutting groove 3 close to the root of the cutting tooth 2.

[0074] Specifically, the angle of the cutting angle ranges from 5° to 75°.

[0075] In the embodiment, the cutting angle corresponding to each point on the blade edge 201 gradually decreases along the first direction. When the overall rigidity of the cutting tooth 2 gradually decreases along the first direction, the cutting angle close to the slot opening of the cutting groove 3 is larger, which ensures the rigidity of the end of the cutting tooth 2, and the rigidity close to the root of the cutting tooth 2 is larger. At this time, the cutting angle close to the groove bottom of the cutting groove 3 can be smaller, so that this place is relatively sharp, while ensuring the overall rigidity of the cutting tooth 2 as much as possible, the cutting angle of the blade edge 201 is as small as possible, and the blade edge 201 is as sharp as possible.

[0076] In the embodiment, the cutting angle corresponding to each point on the blade edge 201 gradually decreases along the first direction and then gradually increases.

[0077] Specifically, as shown in Figure 6 , Figure 8 and Figure 10 , they are cross sections of different positions of the cutting tooth 2 along the first direction in turn. When the end of the cutting tooth 2 is thicker, the rigidity of the cutting tooth 2 along the first direction changes from small to large at this time. Therefore, this setting mode of the cutting angle can ensure the overall rigidity of the cutting tooth 2 while making the blade edge 201 as sharp as possible.

[0078] In the embodiment, the blade edge 201 is a continuous curve, which can effectively reduce the stress concentration phenomenon at the blade edge 201, so as to ensure the rigidity of the blade edge 201.

[0079] Specifically, the profile of the wall surface of the cutting groove 3 in the direction parallel to the shearing surface is at least a parabola, and correspondingly, at least a section of the blade edge 201 is in a parabolic shape. The smooth transition of the wall surface of the cutting groove 3 can ensure the rigidity of the blade, especially the rigidity of each point on the outer periphery of the cutting groove 3, and at the same time, can hinder the discharge of the hair to a certain extent, and improve the efficiency of hair cutting.

[0080] In the embodiment, the tooth groove line 301 is a continuous curve, so as to ensure the smooth transition of the wall surface of the cutting groove 3 in the extension direction of the tooth groove line 301, and ensure the rigidity at this position.

[0081] Specifically, the tooth groove line 301 is a plurality of continuous arc lines, and preferably, the tooth groove line 301 is continuously changed in the slope in the corresponding cross section, so as to Figure 12 or Figure 13 For example, in the XY coordinate system in the above formula, from the bottom surface to the top surface of the cutting tooth 2, the slope k of the tooth groove line 301 is at least a section that is rapidly increased between k=tan 5° and k=tan 75°. In the direction of the cutting tooth 2 from the bottom surface to the top surface, the thickness of the cutting tooth 2 is rapidly thickened. The change is nonlinear, and therefore, when the blade edge 201 at the corresponding position is very sharp, for example, when the blade cutting angle is as small as 5°, the thickness of the other part of the cutting tooth 2 can be rapidly increased, so as to effectively improve the overall rigidity of the blade.

[0082] In the embodiment, the wall surface of the cutting groove 3 extends from the lower end surface of the cutting tooth 2 to the upper end surface of the cutting tooth 2 and forms a continuous curved surface. Compared with the wall surface of the cutting groove 3 connected by a plurality of planes or connected by a curved surface and a plane, the wall surface of this structure is not easy to produce stress concentration, and therefore will not affect the rigidity of the overall structure. The phenomenon of deformation, knife jump and temperature increase during shearing can be effectively reduced. At the same time, during the heat treatment, the continuous curved surface is heated more uniformly, and the temperature change is also more uniform during cooling. Deformation is not easy to occur during the heat treatment process.

[0083] Specifically, as shown in Figure 13 the dashed line part in the figure is the side wall of the cutting tooth 2 in the related art, which is connected by a plurality of angled wall surfaces. The wall surface of the cutting groove 3 in the embodiment is not only faster in the tooth width at the corresponding position, but also smoother in the change of the wall surface.

[0084] Preferably, 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 more smooth.

[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, if Figure 14 As shown in the figure, the direction indicated by the arrow is the direction in which the hair is subjected to force. The shape of the cutting groove in the related art is on the left, 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 in the present embodiment is on the right. The cutting groove 3 in the present 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 in the present 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 in the present embodiment can ensure that the hair entering the cutting groove 3 is more fully cut.

[0087] It should be noted that Figure 14 The shape of the cutting groove 3 on the right 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, if Figure 15 As shown, the end of the cutting tooth 2 can also be set to be outward-flared. 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 the embodiment can be applied in the fields of personal care, hairdressing, pet, medical treatment, etc. The shaving blade can be applied on a rotary shaving cutter or a reciprocating shaving cutter. Preferably, all the shaving blades shown in the drawings are reciprocating shaving blades. Since the main improvement of the present application is the cutting tooth part, the structure of the cutting tooth of the embodiment can be applied to both rotary and reciprocating shaving blades. Here, the rotary shaving blade will not be described again.

[0091] According to an embodiment of the present application, in another aspect, a manufacturing method of a shaving blade is provided for manufacturing the shaving blade described above, which comprises:

[0092] manufacturing the blade body 1; and forming the cutting tooth 2 on the blade body 1 by cutting with the cutting wheel 4.

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

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

[0095] Specifically, in the related art, the cutting tooth 2 is usually machined by using a cutting wheel 4 with a large diameter or by stamping. When the cutting tooth 2 is machined by using a cutting wheel 4 with a large diameter, the cutting angle of the middle part and the notch part of the cutting groove 3 is generally more than 80°, and the sharpness is poor. When the cutting tooth 2 is machined by stamping, the side wall of the cutting groove 3 is generally a plane, and thus the slope of the tooth groove line 301 cannot be changed. At the same time, the stamping acute angle has very high requirements for the mold, the punch is a consumable part, the processing cost is high, and the quality is prone to problems. Therefore, the cost of the stamping acute angle is much higher than the cost of the cutting tooth machined by the cutting wheel 4. Compared with the manufacturing method in the related art, the diameter of the cutting wheel 4 used in the manufacturing method of the embodiment is smaller, the cutting angle can be machined to be smaller, and the inner wall of the cutting groove 3 and the blade edge 201 can also have a certain curvature.

[0096] Further, the specific type of the cutting wheel 4 is not limited, as long as it can perform reliable cutting operation.

[0097] Preferably, 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 type of the cutting wheel 4 is a cutting wheel.

[0098] In the embodiment, in the step of forming the cutting tooth 2 on the blade body 1 by cutting with the cutting wheel 4,

[0099] The cutting wheel 4 cuts the cutting groove 3 on the blade body 1, and the cutting tooth 2 is formed between any two adjacent cutting grooves 3. The cutting wheel 4 is fed from the groove bottom to the groove opening of the cutting groove 3, and the cutting wheel 4 is inclined towards the lower end of the end of the cutting tooth 2 during the feeding process. 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 finishing uses high-precision numerical control cylindrical grinding tooth cutting equipment. The blade profile of the finished product forms a hook. The tooth tip cross-sectional width is greater than the tooth profile middle cross-sectional width. The cutting wheel 4 is ground from the upper surface of the blank. The feeding direction of the cutting wheel 4 is inclined towards the groove opening and the lower end of the toothed leading edge. The tooth width size consistency is within 0.05 mm, and the tooth depth size consistency is within 0.15 mm.

[0101] In the embodiment, the step of manufacturing the blade body 1 includes:

[0102] Preparing a blank; and processing the blank into the blade body 1 according to the appearance size of the blade body 1.

[0103] Specifically, taking a metal sheet with a thickness of 2 mm as an example, the blank is processed into the blade body 1 by stamping and blanking. High-precision progressive dies are used for fine blanking of the product shape and circular hole. A 160T high-precision equipment is used to complete the processing. The outer shape size of the blanked product is 33*36*2 mm. 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, there are two tooth profile auxiliary schemes, i.e., no tooth cutting blanking processing or rough cutting blanking processing. When the tooth is rough cut, the stamping die is added with a tooth cutting function to rough cut the product tooth profile. The blanking tooth profile is reserved with a cutting allowance of more than 0.1 mm on one side of the cutting tooth profile, so as to reduce the cutting pressure and improve the cutting efficiency.

[0104] Preferably, the surface of the blank is smooth, free of defects, free of pockmarks, free of oil stains, and free of scratches.

[0105] In the embodiment, the step of preparing the blank includes:

[0106] Obtaining the hardness of the blank; if the hardness of the blank is greater than or equal to a preset hardness, the blank is processed into the blade body 1; and 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 the 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 continuous dies are used for fine blanking of the product shape and circular holes. The punching machine uses 160T high-precision equipment to complete the processing. The outer dimensions of the stamped blank are 33*36*2.8mm. Similarly, in conjunction with the tooth profile processing in the subsequent process, an auxiliary solution for blanking without cutting teeth can be used in this step, or preliminary rough processing can be performed for cutting teeth. Similarly, when the punching function is added to the stamping die to roughly cut and blank the product tooth shape, a cutting allowance of more than 0.1mm is reserved on one side of the blanked tooth shape compared to the cutting tooth shape to reduce cutting pressure and improve tooth 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: tooth surface fine grinding, blade surface fine grinding is grinded by high-precision numerical control grinding equipment, the high-precision numerical control grinding equipment is high-precision 910 numerical control grinding equipment, including three processes of rough grinding, semi-fine grinding and fine grinding processing, the shear surface grinding flatness is controlled within 0.01. The shear surface tooth shape position grinding surface height difference is controlled within ±0.008, and the grinding surface roughness can be controlled around Ra0.06.

[0123] Step 8: cleaning and drying: the ultrasonic cleaning method is used to remove the stains of the product surface grinding residues.

[0124] Step 9: appearance inspection, the appearance of the defective products such as broken teeth, skewed teeth, indentation, scratch, rust, stain and deformation is picked out by manual visual inspection.

[0125] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A shaving blade characterized in that, The utility model relates to a cutting tool, comprising: a blade body (1); a plurality of cutting teeth (2) are arranged at intervals on the blade body (1), two adjacent cutting teeth (2) form a cutting groove (3) between them, the intersection of the wall surface of the cutting groove (3) and the lower end surface of the cutting tooth (2) forms an edge (201), the tangent of any point on the edge (201) and the lower end surface forms a cutting angle, the wall surface of the cutting groove (3) and the plane perpendicular to the lower end surface intersect 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 along the direction away from the edge (201), so that the cutting tooth (2) remains sharp while having a corresponding thickness; the direction of the notch of the cutting groove (3) towards the groove bottom of the cutting groove (3) is a first direction, the cutting angle corresponding to each point on the edge (201) continuously changes along the first direction; the cutting angle corresponding to each point on the edge (201) gradually decreases along the first direction, or the cutting angle corresponding to each point on the edge (201) gradually decreases first and then gradually increases along the first direction; the edge (201) is a continuous curve; the tooth groove line (301) is a continuous curve; wherein the notch 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 groove bottom of the cutting groove (3) refers to the position of the cutting groove (3) close to the root of the cutting tooth (2).

2. The shaving blade of claim 1 wherein, The cutting angle corresponding to any point on the edge (201) is less than 75°.

3. A shaving blade according to claim 1 or 2, characterised in that The tooth groove line (301) is a plurality of continuous arcs.

4. A manufacturing method of a shaving blade for manufacturing the shaving blade according to any one of claims 1 to 3, characterized by, The manufacturing method comprises: manufacturing a blade body (1); forming cutting teeth (2) on the blade body (1) by cutting with a cutting wheel (4); wherein the diameter of the cutting wheel (4) is less than or equal to 80 mm, two adjacent cutting teeth (2) form a cutting groove (3) between them, the wall surface of the cutting groove (3) and the plane perpendicular to the lower end surface intersect 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 along the direction away from the edge (201).

5. The method of manufacturing a razor blade according to claim 4, wherein In the step of forming the cutting teeth (2) on the blade body (1) by cutting with the cutting wheel (4), the cutting angle corresponding to any point on the edge (201) of the cutting tooth (2) is less than 75°.

6. The method of manufacturing a razor blade according to claim 4, wherein In the step of forming the cutting teeth (2) on the blade body (1) by cutting with the cutting wheel (4), the cutting wheel (4) forms the cutting groove (3) on the blade body (1), any two adjacent cutting grooves (3) form the cutting tooth (2) between them, the cutting wheel (4) feeds from the groove bottom of the cutting groove (3) to the direction of the notch of the cutting groove (3), and the cutting wheel (4) tilts towards the lower end of the end of the cutting tooth (2) during the feeding process, And / or, the rotating speed of the cutting wheel (4) is 3000r / min to 15000r / min, and the cutting feed speed of the cutting wheel (4) is 0.1mm / min to 10mm / min.

7. The manufacturing method of a shaving blade according to any one of claims 4 to 6, characterized in that, The step of manufacturing the blade body (1) comprises: preparing a blank; processing the blank according to the appearance size of the blade body (1) to form the blade body (1).

8. The manufacturing method of a razor blade according to claim 7, characterized by, The step of preparing the blank comprises: 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 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).

9. The method of manufacturing a razor blade according to claim 8, wherein 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, the heat treatment device heat treating the blank at a heat treatment temperature range of 850℃ to 1300℃ and a holding time greater than or equal to 30min; removing the blank from the heat treatment device after cooling the blank to a preset temperature range, the preset temperature range being room temperature to 65℃.

10. The manufacturing method of a shaving blade according to any one of claims 4 to 6, characterized in that, After the step of cutting the cutting teeth (2) on the blade body (1) by the cutting wheel (4), it further comprises: grinding the surface of the cutting teeth to make the flatness and surface roughness of the surface of the cutting teeth (2) reach a preset flatness and a preset surface roughness.

Images