Shaving blade and method of manufacturing the same

Abstract

The present application relates to the technical field of shaving razor, and discloses a shaving razor blade and a manufacturing method thereof.The shaving razor blade comprises a blade body, a plurality of cutting teeth arranged on the blade body, and a cutting groove formed between two adjacent cutting teeth.The wall surface of the cutting groove is extended from the lower end surface of the cutting tooth to the upper end surface of the cutting tooth and forms a continuous curved surface.The wall surface of the cutting groove is extended from the lower end surface of the cutting tooth to the upper end surface of the cutting tooth and forms a continuous curved surface, compared with the wall surface of the cutting groove connected by multiple planes or connected by a curved surface and a plane.The stress concentration of the wall surface of this structure is not easy to occur, thereby not affecting the rigidity of the overall structure, and the phenomenon of deformation, knife jump and temperature increase during the shearing process can be effectively reduced.Meanwhile, during the heat treatment, the continuous curved surface is heated more uniformly, the temperature change is more uniform during cooling, and deformation is not easy to occur during the heat treatment process, effectively solving the problem of poor reliability of the side wall of the existing cutting tooth.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shaving razor, 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 razor, and the existing shaver or razor mainly includes a rotary type and a reciprocating type. The shaving razor blade rotates or swings in the head of the shaver or razor, 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 reliability of the cutting teeth in the hair cutting process will affect the cutting effect of the hair.

[0003] At present, the side wall of the existing cutting tooth is usually connected by a plurality of wall surfaces. The side wall of the cutting tooth is the side wall of the cutting groove. When the side wall of the cutting tooth extends upward along the vertical direction, the side wall of the cutting tooth is usually connected by a plurality of planes at different angles, or the side wall of the cutting tooth is connected by a curved surface and a plane. Since the angle of the connection between the adjacent two surfaces changes suddenly, the connection between the adjacent two surfaces of the cutting tooth will produce stress concentration when the cutting tooth is used, thereby affecting the rigidity of the structure and easily causing deformation, tooth jumping and increase of temperature rise and other problems. At the same time, the side wall of this structure is also prone to deformation during the heat treatment step in the manufacturing process due to uneven heating. Therefore, the existing side wall of the cutting tooth also has the problem of poor reliability. SUMMARY

[0004] Therefore, the present application provides a shaving razor blade and a manufacturing method thereof to solve the problem of poor reliability of the side wall of the existing cutting tooth.

[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, a cutting groove being formed between adjacent two cutting teeth, and a wall surface of the cutting groove extending from a lower end surface of the cutting tooth to an upper end surface of the cutting tooth and forming a continuous curved surface.

[0006] In an optional embodiment, the wall surface of the cutting groove is a plurality of continuous arc surfaces.

[0007] In an optional embodiment, an intersection between the wall surface of the cutting groove and the lower end surface of the cutting tooth forms an edge, an included angle between a tangent line of any point on the edge and the lower end surface is a cutting angle, the wall surface of the cutting groove intersects with a plane perpendicular to the lower end surface to form a tooth groove line, and a 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, so that the cutting tooth remains sharp while having a corresponding thickness.

[0008] In an optional embodiment, the cutting angle corresponding to any point on the edge is less than 75°.

[0009] In an alternative embodiment, the first direction is a direction from the bottom of the cutting groove to the opening of the cutting groove, and the cutting angle corresponding to each point on the cutting edge continuously changes along the first direction.

[0010] In an alternative embodiment, the cutting angle corresponding to each point on the cutting edge gradually decreases along the first direction, or the cutting angle corresponding to each point on the cutting edge gradually decreases and then gradually increases along the first direction.

[0011] In an alternative embodiment, the cutting edge is a continuous curve.

[0012] In a second aspect, the present application 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 the 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, and the cutting groove is formed between any two adjacent cutting teeth, and the wall surface of the cutting groove is formed by extending from the lower end surface of the cutting tooth to the upper end surface of the cutting tooth and forming a continuous curved surface.

[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 wheel cuts the cutting groove on the blade body, and the cutting tooth is formed between any two adjacent cutting grooves, the cutting wheel is fed from the bottom of the cutting groove to the opening of the cutting groove, the cutting wheel is inclined towards the lower end of the end portion of the cutting tooth during the feeding process, and / or the rotating 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.

[0016] In an alternative embodiment, the step of manufacturing the blade body comprises:

[0017] preparing a blank; and processing the blank to form the blade body according to the external dimensions of the blade body.

[0018] In an alternative embodiment, the step of preparing the blank comprises:

[0019] obtaining the hardness of the blank; if the hardness of the blank is greater than or equal to a preset hardness, the blank is formed into 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.

[0020] In an alternative embodiment, if the hardness of the blank is less than the preset hardness, the step of heat treating the blank comprises:

[0021] The blank is placed in a heat treatment device, the blank is heat treated by the heat treatment device at a heat treatment temperature ranging from 850 DEG C to 1300 DEG C, and the holding time is greater than or equal to 30 min; the blank is taken out from the heat treatment device after being cooled to a preset temperature range, and the preset temperature range is room temperature to 65 DEG C.

[0022] In an alternative embodiment, the step of forming the cutting teeth by cutting on the blade with the cutting wheel is followed by the steps of:

[0023] The surface of the cutting tooth is ground so that the flatness and surface roughness of the surface of the cutting tooth reach a preset flatness and a preset surface roughness.

[0024] Advantages:

[0025] 1. The wall surface of the cutting groove is formed by the lower end surface of the cutting tooth extending towards the upper end surface of the cutting tooth and forming a continuous curved surface. Compared with the wall surface of the cutting groove being connected by multiple planes or being connected by a curved surface and a plane, the wall surface of this structure is not prone to stress concentration, thereby not affecting the rigidity of the overall structure, effectively reducing the phenomena of deformation, tool jumping and temperature increase during shearing, and at the same time, during heat treatment, the continuous curved surface is heated more uniformly, and the temperature change is also more uniform during cooling, and deformation is not prone to occur during heat treatment, effectively solving the problem of poor reliability of the side wall of the existing cutting tooth.

[0026] 2. The slope of the tooth groove line is set to gradually increase in the direction away from the blade edge, and the slope of the part of the tooth groove line close to the blade edge is smaller, so that the blade edge is 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 reduction speed of the tooth width is slower, so 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 overall rigidity of the cutting tooth is higher. In this way, the cutting angle of the cutting tooth can be very small, while the rigidity of the cutting tooth can be ensured, effectively solving the problem that the existing shaving blade cannot balance sharpness and rigidity.

[0027] 3. Since the angles of the cutting angles at different positions of the cutting tooth are different, the rigidity is also different, and the size of the cutting angle directly affects the rigidity of the cutting tooth at that position. In order to ensure the overall rigidity of the cutting tooth, the cutting angle continuously changes along the first direction, and 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. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort based on these drawings.

[0029] Figure 1 A three-dimensional schematic view of a shaving blade according to an embodiment of the present application;

[0030] 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;

[0031] 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;

[0032] 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;

[0033] Figure 5 A sectional view of the shaving blade shown in FIG. 1 at B-B; Figure 4 A sectional view of the shaving blade shown in FIG. 1 at B-B; A sectional view of the shaving blade shown in FIG. 1 at B-B;

[0034] A sectional view of the shaving blade shown in FIG. 1 at B-B; Figure 6 A sectional view of the shaving blade shown in FIG. 1 at B-B; Figure 5 A sectional view of the shaving blade shown in FIG. 1 at B-B; A sectional view of the shaving blade shown in FIG. 1 at B-B;

[0035] A sectional view of the shaving blade shown in FIG. 1 at B-B; Figure 7 A sectional view of the shaving blade shown in FIG. 1 at B-B; Figure 4 A sectional view of the shaving blade shown in FIG. 1 at B-B; A sectional view of the shaving blade shown in FIG. 1 at B-B;

[0036] A sectional view of the shaving blade shown in FIG. 1 at B-B; Figure 8 A sectional view of the shaving blade shown in FIG. 1 at B-B; Figure 7 A sectional view of the shaving blade shown in FIG. 1 at B-B; A sectional view of the shaving blade shown in FIG. 1 at B-B;

[0037] A sectional view of the shaving blade shown in FIG. 1 at B-B; Figure 9 A sectional view of the shaving blade shown in FIG. 1 at B-B; Figure 4 A sectional view of the shaving blade shown in FIG. 1 at B-B; A sectional view of the shaving blade shown in FIG. 1 at B-B;

[0038] A sectional view of the shaving blade shown in FIG. 1 at B-B; Figure 10 A sectional view of the shaving blade shown in FIG. 1 at B-B; Figure 9 A sectional view of the shaving blade shown in FIG. 1 at B-B; A sectional view of the shaving blade shown in FIG. 1 at B-B;

[0039] A sectional view of the shaving blade shown in FIG. 1 at B-B; Figure 11 A sectional view of the shaving blade shown in FIG. 1 at B-B; Figure 1 A sectional view of the shaving blade shown in FIG. 1 at B-B; A sectional view of the shaving blade shown in FIG. 1 at B-B;

[0040] A sectional view of the shaving blade shown in FIG. 1 at B-B; Figure 12 A sectional view of the shaving blade shown in FIG. 1 at B-B; Figure 1 A sectional view of the shaving blade shown in FIG. 1 at B-B; A sectional view of the shaving blade shown in FIG. 1 at B-B;

[0041] Figure 13 A comparison diagram of the tooth groove line of the cutting tooth of the shaving blade shown in Figure 1

[0042] Figure 14 A comparison diagram of the blade edge of the shaving blade shown in Figure 1

[0043] Figure 15 A schematic diagram of the preliminary cutting of the manufacturing method of the shaving blade of the embodiment of the present application;

[0044] Figure 16 A schematic diagram of the further cutting of the manufacturing method of the shaving blade shown in Figure 15

[0045] Figure 17 A schematic diagram of the further cutting of the manufacturing method of the shaving blade shown in Figure 16

[0046] A schematic diagram of the further cutting of the manufacturing method of the shaving blade shown in Figure 18 Figure 17 A schematic diagram of the further cutting of the manufacturing method of the shaving blade shown in

[0047] Figure 19 A schematic diagram of the further cutting of the manufacturing method of the shaving blade shown in Figure 18 A schematic diagram of the further cutting of the manufacturing method of the shaving blade shown in

[0048] Figure 20 A schematic diagram of the further cutting of the manufacturing method of the shaving blade shown in Figure 19

[0049] A schematic diagram of the further cutting of the manufacturing method of the shaving blade shown in Figure 21 Figure 20

[0050] Explanation of reference numerals:

[0051] 1, blade body; 2, cutting tooth; 201, blade edge; 3, cutting groove; 301, tooth groove line; 4, cutting wheel. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0053] The embodiments of the present application will be described below in conjunction with Figures 1 to 21 .​​​​​​

[0054] According to an embodiment of the present application, in one aspect, there is provided a shaving blade, 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, and the wall surface of the cutting groove 3 extends from the lower end surface of the cutting tooth to the upper end surface of the cutting tooth and forms a continuous curved surface.

[0055] The shaving blade of the present embodiment has the wall surface of the cutting groove 3 extending from the lower end surface of the cutting tooth 2 to the upper end surface of the cutting tooth 2 and forming a continuous curved surface, which is not prone to stress concentration compared to the wall surface of the cutting groove 3 connected by multiple flat surfaces or connected by curved surfaces and flat surfaces, thereby not affecting the rigidity of the overall structure, effectively reducing the deformation, skip and temperature increase during shearing, and at the same time, the continuous curved surface is heated more uniformly during heating and the temperature change is more uniform during cooling, and is not prone to deformation during heat treatment, effectively solving the problem of poor reliability of the side wall of the existing cutting tooth.

[0056] 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 multiple angled wall surfaces, and the wall surface of the cutting groove 3 of the present embodiment not only has a faster tooth width at the corresponding position, but also has a smoother wall surface change.

[0057] In the present embodiment, the wall surface of the cutting groove 3 is a plurality of continuous curved surfaces, which is easier to process and makes the wall surface of the cutting groove 3 more smooth.

[0058] In the present embodiment, 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 line of any point on the edge 201 and the lower end surface forms 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 the slope of each point on the tooth groove line 301 with respect 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.

[0059] Among them, 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 with respect to the lower end surface gradually increases along the direction away from the edge 201, and the angle of the cutting angle is not specifically limited here, so that the edge 201 can quickly and effectively cut hair.

[0060] Specifically, the slope of the groove line 301 is set to gradually increase along the direction away from the cutting edge 201, with a smaller slope in the part of the groove line 301 near the cutting edge 201, making the cutting edge 201 sharper. When the cutting tooth 2 extends from the bottom surface to the top surface, the tooth width of the cutting tooth 2 changes non-linearly, and the tooth width decreases more slowly. Therefore, the two side walls of the cutting tooth 2 will not intersect prematurely. Compared with the cutting tooth 2 in related technologies, the tooth width of the upper middle part of the cutting tooth 2 in this embodiment is wider, and the overall tooth thickness is also thicker, making the overall rigidity of the cutting tooth 2 higher. This allows the cutting angle of the cutting tooth 2 to be very small while ensuring the rigidity of the cutting tooth 2, effectively solving the problem that existing razor blades cannot balance sharpness and rigidity.

[0061] Specifically, in related technologies, in order to ensure that the cutting teeth 2 have a certain thickness, their cutting angle is generally greater than 80°. The sidewall of the cutting teeth 2 is approximately perpendicular to the bottom surface of the cutting teeth 2, which makes the edge 201 of the cutting groove 3 at the sidewall insufficiently sharp. Only the edge 201 of the cutting groove 3 near the bottom of the groove is relatively sharp. When cutting hair, due to the insufficient sharpness of the bottom of the sidewall of the cutting teeth 2, the hair is mainly removed by the part of the cutting groove 3 near the bottom of the groove. The hair removal effect of this type of cutting teeth 2 is poor. However, the razor blade of this embodiment can make the edge 201 of the sidewall of the cutting groove 3 relatively sharp as well, so that the entire edge 201 can effectively remove the hair, greatly improving the hair removal effect.

[0062] The sidewall of the cutting tooth 2 is the same as the sidewall of the cutting groove 3, referring to the walls located on both sides of the cutting groove 3. The tooth width of the cutting tooth 2 refers to... Figure 3 The width of a single cutting tooth 2 in the "left-right" direction indicated by the middle arrow; the tooth thickness of cutting tooth 2 refers to... Figure 3 The thickness of a single cutting tooth 2 in the "up and down" direction indicated by the middle arrow.

[0063] In this embodiment, the cutting angle corresponding to any point on the cutting edge 201 is less than 75°, and the cutting edge 201 as a whole can maintain a sharp state. As soon as the hair enters the cutting groove 3 and comes into contact with the cutting edge 201, cutting begins. A portion of the uncut hair comes into contact with the cutting edge 201 in the middle of the cutting groove 3 and is cut. The remaining hair is completely cut after coming into contact with the cutting edge 201 at the bottom of the cutting groove 3, which can ensure that all the hair entering the cutting groove 3 is cut.

[0064] Furthermore, such as Figure 12 and Figure 13 As shown, all are cross-sections perpendicular to the extension direction of cutting tooth 2. Figure 12 This is the case when the cutting angle is large. Figure 13For the case of small cutting angle, the solid line part is the cutting tooth 2 of the embodiment with the non-linear tooth groove line 301, and the dashed line part is the cutting tooth 2 with the non-linear tooth groove line 301 in the related art, where a is the cutting angle, X is the tooth width, and Y is the tooth thickness. The extension direction of the cutting tooth 2 is the direction perpendicular to the "up and down" direction and the "left and right" direction indicated by the arrow. Figure 3 The direction perpendicular to the "up and down" direction and the "left and right" direction indicated by the arrow.

[0065] The following describes the change of the tooth thickness of the cutting tooth 2 with the tooth width:

[0066] Figure 12 The angle of the cutting angle is 70.2°, and the change of the non-linear and linear tooth thickness is shown in Table 1 below,

[0067] 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

[0068] Table 1

[0069] Figure 13 The angle of the cutting angle is 36.5°, and the change of the non-linear and linear tooth thickness is shown in Table 2 below,

[0070] 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

[0071] Table 2

[0072] From the above data, it can be seen that when the tooth width is consistent, the thickness of the cutting tooth 2 with the non-linear 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 non-linear 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 of the embodiment is more obvious when the blade edge 201 is sharper.

[0073] The specific data of the tooth width and the tooth thickness is 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 relationship, and can be adjusted arbitrarily according to needs.

[0074] 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, which can effectively improve the rigidity of the cutting tooth 2 when the blade edge 201 is relatively sharp.

[0075] In this embodiment, the direction from the opening of the cutting groove 3 to the bottom of the cutting groove 3 is the first direction. The cutting angle corresponding to each point on the cutting edge 201 changes continuously along the first direction. Since the rigidity of the cutting tooth 2 is different when the angle of the cutting angle at different positions is 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 angle of the cutting angle is larger, and at the position where the rigidity of the cutting tooth 2 is high, the angle of the cutting angle can be smaller.

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

[0077] Specifically, the cutting angle varies from 5° to 75°.

[0078] In this embodiment, the cutting angles corresponding to each point on the cutting edge 201 gradually decrease along the first direction. When the overall rigidity of the cutting tooth 2 gradually decreases along the first direction, the cutting angle near the opening of the cutting groove 3 is larger, ensuring the rigidity of the end of the cutting tooth 2. The rigidity near the root of the cutting tooth 2 is larger, so the cutting angle near the bottom of the cutting groove 3 can be smaller, making it sharper. While ensuring the overall rigidity of the cutting tooth 2 as much as possible, the cutting angle of the cutting edge 201 is made as small as possible, so that the cutting edge 201 remains as sharp as possible.

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

[0080] Specifically, such as Figure 6 , Figure 8 as well as Figure 10 As shown, the cross-sections of the cutting tooth 2 at different positions along the first direction are shown in sequence. 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. Therefore, this setting of the cutting angle can ensure the overall rigidity of the cutting tooth 2 while keeping the cutting edge 201 as sharp as possible.

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

[0082] Specifically, at least one section of the wall of the cutting groove 3 is set as a parabola in the direction parallel to the shearing plane. Correspondingly, at least one section of the cutting edge 201 is also parabolic. This smooth transition of the wall 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. Similarly, it can also hinder the discharge of hair to a certain extent and improve the efficiency of hair cutting.

[0083] In the embodiment, the tooth groove line 301 is a continuous curve to ensure that the wall surface of the cutting groove 3 is smoothly connected in the extension direction of the tooth groove line 301, and the rigidity at this position is ensured.

[0084] Specifically, the tooth groove line 301 is a plurality of continuous arc lines, preferably, the tooth groove line 301 is in the corresponding cross section, the slope is continuously changed, so that the thickness of the cutting tooth 2 is continuously increased in the direction from the bottom surface to the top surface. 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 one segment that is rapidly increased between k=tan 5° and k=tan 75°, and the thickness of the cutting tooth 2 is rapidly increased in the direction from the bottom surface to the top surface. The change is nonlinear, so when the cutting edge 201 at the corresponding position is very sharp, for example, when the cutting edge 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 the embodiment, the direction of the groove bottom of the cutting groove 3 is the second direction, the width of the cutting groove 3 is first increased and then decreased along the second direction, and the width of the cutting groove 3 at the opening of the cutting groove 3 is smaller. The hair entering the cutting groove 3 will be limited by the opening of the cutting groove 3, which can ensure that the hair entering the cutting groove 3 is effectively cut before being discharged, further improving the cutting efficiency of the hair.

[0086] Specifically, as shown in Figure 14 The direction of the arrow is the direction of the force of the hair, the left side is the shape of the cutting groove 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 out of the cutting groove 3 during work, which will affect the cutting efficiency. The shape of the cutting groove 3 on the right side is the shape of the cutting groove 3 in the embodiment. The cutting groove 3 in the embodiment has a closing shape as a whole, and the slopes of the tangent lines at each point of the cutting edge 201 are different. The cutting groove 3 has a tendency to accommodate hair. Compared with the cutting groove in the related art, the cutting groove 3 in the 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 side is only a schematic of the shape of the cutting groove 3 in the embodiment. The side wall of the cutting groove 3 is not limited to the bending degree shown in the figure. The bending degree of the side wall of the cutting groove 3 can be smaller or larger than the bending degree shown in the figure, which 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, and 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 around the blade edge 201; when the wall surface of the cutting groove 3 is a continuous arc surface or a curved surface around the blade edge 201, the profile of the blade edge 201 can also be a parabolic type, an optimal arc, or an arch, etc., which can meet the use requirements.

[0089] In the present embodiment, as shown in Figure 15 The end of the cutting tooth 2 can also be outwardly expanded, and the end of the cutting tooth 2 in this structure can guide the hair into the cutting groove 3, further improving the efficiency of hair cutting.

[0090] The shaving blade of the present embodiment can be applied in the fields of personal care, hairdressing, pets, medical treatment, etc., and 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 point of the present application is the cutting tooth part, the structure of the cutting tooth of the present embodiment can be applied to both rotary and reciprocating shaving blades, and the rotary shaving blade will not be described here.

[0091] According to the embodiment of the present application, on the other hand, a manufacturing method of a shaving blade is provided for manufacturing the above-mentioned shaving blade, 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] 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 extends from the lower end surface of the cutting tooth to the upper end surface of the cutting tooth and forms a continuous curved surface, 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 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 present 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 in the form of a cutting wheel 4 with a large diameter or stamping, when machined by the 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 above 80°, and the sharpness is poor, when machined in the form of 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, so the cost of the stamping acute angle is much higher than the cost of the tooth cutting 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 at the same time, the inner wall of the cutting groove 3 and the blade edge 201 can have a certain curvature.

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

[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 grinding wheel.

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

[0099] The cutting wheel 4 cuts the cutting groove 3 on the blade body 1, the cutting tooth 2 is formed between any two adjacent cutting grooves 3, the cutting wheel 4 is fed from the groove bottom of the cutting groove 3 to the notch direction of the cutting groove 3, the cutting wheel 4 is inclined toward the lower end of the end part of the cutting tooth 2 during the feeding process, and / or the rotating 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 edge 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 starts to grind from the upper surface of the blank, the feeding direction of the cutting wheel is inclined toward the notch 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] The blank is prepared, and the blank is machined according to the appearance size of the blade body 1 to form the blade body 1.

[0103] Specifically, the size specification of the blank in this embodiment is taken as an example of a metal sheet with a thickness of 2 mm, the blank is formed into the blade body 1 by stamping and blanking, the stamping uses a high-precision progressive die to perform fine blanking processing on the product shape and round hole, a 160T high-precision equipment is used to complete the processing, and the shape size of the blanked blank is 33*36*2mm. In actual production, the production efficiency can reach about 10,000-15,000 per shift. In the tooth shape processing of the subsequent process, there are two tooth shape auxiliary schemes in this step, namely, no tooth blanking processing or rough cutting tooth preliminary roughing processing. When the preliminary roughing processing is performed on the cutting tooth, the stamping die is increased with the tooth function to perform rough cutting blanking on the product tooth shape, and the blanking tooth shape is reserved with a cutting allowance of more than 0.1mm on a single side of the cutting tooth shape, so as to reduce the cutting pressure and improve the cutting efficiency.

[0104] Preferably, the surface of the blank is smooth without defects, no pitted surface, no oil stains, and no scratches.

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

[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 forms 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 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, the heat treatment device performs heat treatment on the blank at a heat treatment temperature ranging from 850°C to 1300°C and a holding time greater than or equal to 30 min; and the blank is cooled to a preset temperature range and taken out of the heat treatment device, the preset temperature range being room temperature to 65°C.

[0109] Specifically, the heat treatment is vacuum heat treatment, the blank is placed in a heat treatment furnace for vacuum heat treatment, the furnace temperature is between 1200±5°C, the holding time is 35 min, nitrogen gas is used for rapid cooling, the cooling temperature is 40-60°C, the furnace is discharged, and precise setting control is performed: the above heat treatment processing parameters are input into the heat treatment control system, the equipment is processed according to the input processing parameters, the hardness is precisely controlled and stable, for example, the hardness of 420J2 material can be controlled at HRC52 to HRC56. In this step, the production efficiency can process about 15,000 per furnace, the use of vacuum heat treatment can ensure that the hardness and deformation of the product are in an ideal state, and the consistency of the product is ensured.

[0110] Specifically, after the blank forms the blade body 1, surface rough polishing is also needed to remove burrs on the surface, a centrifugal type rolling and polishing equipment is used for polishing processing, and the cutting wheel 4 rotates at a speed of 40-70r / min. In this step, the production efficiency is about 10,000 per shift.

[0111] In the present embodiment, after the step of forming the cutting tooth 2 by cutting on the blade 1 with the cutting wheel 4, further comprises:

[0112] Grinding the surface of the cutting tooth to make the flatness and surface roughness of the surface of the cutting tooth 2 reach the preset flatness and preset surface roughness.

[0113] Specifically, the grinding includes surface fine polishing and tooth surface fine grinding, the surface fine polishing removes the product tooth shape burrs by using a fine polishing equipment, and the fine polishing equipment is a centrifugal type tumbling polishing equipment, and the rotating speed of the drum of the polishing machine is 40-70 r / min, and the tooth surface fine grinding is mainly to grind the blade surface, and the blade surface fine grinding is produced by using a high-precision numerical control grinding equipment, and the high-precision numerical control grinding equipment is a high-precision 910 numerical control grinding equipment, and includes three processes of rough grinding, semi-fine grinding and fine grinding, and the flatness of the shear surface grinding can be controlled within 0.01, the height difference of the grinding surface of the shear surface tooth shape position grinding, that is, the straightness tolerance can be controlled within ±0.008, and the roughness of the grinding surface can be controlled at about Ra0.06.

[0114] In the present embodiment, after the grinding step, cleaning and drying and appearance inspection are also needed, in the cleaning and drying, ultrasonic cleaning method is used to remove the stains remaining on the surface of the product after grinding, in the appearance inspection, manual visual inspection method is used to pick out the appearance defective products, to ensure that the finished products are free of broken teeth, skewed teeth, indentations, scratches, rust, stains and deformation.

[0115] Hereinafter, the whole process of the manufacturing method of the razor blade of the present embodiment is described using a metal sheet with a thickness of 2.8 mm as the blank:

[0116] Step 1: preparing materials, preparing a metal sheet with a thickness of 2.8 mm, requiring smooth surface without defects, no pockmarks, no oil stains and no scratches.

[0117] Step 2: punching and blanking forming, the punching uses a high-precision progressive die to perform fine punching and blanking processing on the product shape and round hole, and a 160T high-precision equipment is used to complete the processing, and the outer dimension of the punched blank is 33*36*2.8mm. Similarly, in the tooth shape processing in the subsequent process, no cutting tooth blanking auxiliary scheme can be performed in this step, or preliminary rough cutting of the cutting tooth can be performed. Similarly, when the product tooth shape is roughly cut by the punching die with punching tooth function, the blanking tooth shape is compared with the cutting tooth shape, and more than 0.1mm cutting allowance is reserved on one side of the cutting tooth, so as to reduce the cutting pressure and improve the cutting efficiency.

[0118] Step 3: Vacuum heat treatment, the blank obtained in step 2 is placed in a heat treatment furnace for vacuum heat treatment, the furnace temperature is between 900±5℃, the holding time is 55min, nitrogen is used for rapid cooling, and the cooling temperature is 50℃±5℃ when the furnace is discharged. Precise setting control: the above heat treatment processing parameters are input into the heat treatment control system, and the equipment is processed according to the input processing parameters, and the hardness is precisely controlled and stable during processing.

[0119] Step 4: Surface rough polishing, using centrifugal type rolling polishing equipment for polishing processing, the cutting wheel 4 rotates at 40-70r / min.

[0120] Step 5: Tooth profile fine cutting, tooth profile fine cutting uses high-precision numerical control cylindrical grinding cutting equipment, the cutting wheel 4 has a diameter of 17-80mm; the cutting wheel 4 rotates at 600-1000r / min, the cutting feed speed is 10mm / min, and the formed blade angle range is 5°-75°. The feed direction of the cutting wheel 4 can be inclined towards the notch and the lower end of the toothed front edge as described in the above embodiment, or it can be fed from the notch to the groove bottom. Similarly, the tooth width size consistency is within 0.05mm, and the tooth depth size consistency is within 0.15mm.

[0121] Step 6: Surface fine polishing, the product tooth profile burrs are removed by using fine polishing equipment, and the fine polishing equipment is a centrifugal type rolling polishing equipment. The specific polishing machine drum speed is 40-70r / min.

[0122] Step 7: Tooth surface fine grinding, the blade surface fine grinding is produced by using high-precision numerical control grinding equipment, and the high-precision numerical control grinding equipment is a high-precision 910 numerical control grinding equipment, which includes three processes of coarse grinding, semi-fine grinding and fine grinding processing. The shear surface grinding flatness is controlled to be within 0.01. The shear surface tooth profile position grinding surface height difference is controlled to be within ±0.008, and the grinding surface roughness can be controlled to be about Ra0.06.

[0123] Step 8: Cleaning and drying: the product surface grinding residual stains are removed by using ultrasonic cleaning method.

[0124] Step 9: Appearance inspection, the appearance defective products such as broken teeth, skewed teeth, indentation, scratches, rust, stains and deformation are picked out by using artificial visual inspection method.

[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, including: A blade (1); A plurality of cutting teeth (2) are arranged at intervals on the blade (1), and cutting grooves (3) are formed between adjacent two cutting teeth (2), the wall surface of the cutting groove (3) is extended from the lower end surface of the cutting tooth to the upper end surface of the cutting tooth and forms a continuous curved surface; The direction of 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 edge (201) continuously changes along the first direction; The cutting angle corresponding to each point on the edge (201) gradually decreases first and then gradually increases along the first direction; 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 included angle of the 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) 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) is sharp while having a corresponding thickness.

2. The shaving blade of claim 1 wherein, The wall surface of the cutting groove (3) is a plurality of continuous arc surfaces.

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

4. The shaving blade of claim 1 wherein, The edge (201) is a continuous curve.

5. A manufacturing method of a shaving blade for manufacturing the shaving blade according to any one of claims 1 to 4, characterized by, The manufacturing method comprises: Manufacturing a blade (1); Forming cutting teeth (2) on the blade (1) by cutting wheel (4); Wherein, the diameter of the cutting wheel (4) is less than or equal to 80mm, and the cutting groove (3) is formed between adjacent two cutting teeth (2), the wall surface of the cutting groove (3) is extended from the lower end surface of the cutting tooth to the upper end surface of the cutting tooth and forms a continuous curved surface.

6. The method of manufacturing a razor blade according to claim 5, wherein In the step of forming the cutting tooth (2) on the blade (1) by the cutting wheel (4), The cutting wheel (4) cuts the cutting groove (3) on the blade (1), and the cutting tooth (2) is formed between any adjacent two cutting grooves (3), the cutting wheel (4) is fed from the groove bottom of the cutting groove (3) to the notch direction of the cutting groove (3), and the cutting wheel (4) is inclined towards the lower end of the end part of the cutting tooth (2) during feeding, And / or, the rotating speed of the cutting wheel (4) is 5000r / min to 3000r / 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 claim 5 or 6, characterized in that, The step of manufacturing the blade (1) comprises: Preparing a blank; The blank is processed according to the appearance size of the blade (1) to form the blade (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 the 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 (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: putting the blank into a heat treatment device, the heat treatment device being capable of heat treating the blank at a heat treatment temperature ranging from 850 to 1300 ℃ for a holding time of 30 min or more; 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 ℃.

10. The manufacturing method of a razor blade according to claim 5 or 6, characterized by, The method further comprises, after the step of forming the cutting teeth (2) on the blade (1) by cutting with the cutting wheel (4): grinding the surface of the cutting teeth so that the flatness and surface roughness of the surface of the cutting teeth (2) reach preset flatness and preset surface roughness.

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