Shaving blade and method of manufacturing the same

Abstract

The present application relates to the technical field of shaving razors, 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 at intervals on the blade body, and a cutting groove formed between two adjacent cutting teeth.The direction of the groove bottom of the cutting groove towards the opening of the cutting groove is a second direction, and the width of the cutting groove increases first and then decreases along the second direction.The cutting groove as a whole has a tapering shape and a tendency to accommodate hair.During operation, the cutting groove pushes the uncut hair entering the cutting groove towards the center of the cutting groove, ensuring that the hair entering the cutting groove is effectively cut before being discharged, thereby effectively improving the cutting efficiency of the hair and solving the problem of low hair cutting efficiency caused by poor receiving and discharging effect of the existing shaving razor blade.

Description

TECHNICAL FIELD

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

[0002] The shaving 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 blade rotates or swings in the head of the shaver or shaver, so that the shaving blade moves relative to the fixed blade net to cut the hair entering between the shaving blade and the fixed blade net. The cutting end of the shaving blade is usually provided with a plurality of cutting teeth at intervals, and a cutting groove is formed between adjacent two cutting teeth. The receiving and sending effect of the cutting groove affects the cutting efficiency of the hair.

[0003] At present, the side wall of the cutting groove of the existing shaving blade is a plane, the groove width of the cutting groove gradually increases from the groove bottom to the groove opening, and the cutting groove as a whole is in a "horn" shape. When the shaving blade moves along the cutting direction, the side wall of the cutting groove with this structure will push the hair towards the groove opening of the cutting groove after contacting the hair, which will make the hair just entering the cutting groove have a tendency to be pushed out of the cutting groove, thereby affecting the cutting efficiency of the hair. Therefore, the existing shaving blade still has the problem of low hair cutting efficiency caused by poor receiving and sending effect. SUMMARY

[0004] Therefore, the present application provides a shaving blade and a manufacturing method thereof to solve the problem of low hair cutting efficiency caused by poor receiving and sending effect of the existing shaving blade.

[0005] In a first aspect, the present application provides a shaving blade, comprising: a blade body; a plurality of cutting teeth, which are arranged at intervals on the blade body, and a cutting groove is formed between adjacent two cutting teeth, the direction of the groove bottom of the cutting groove towards the groove opening is a second direction, and the width of the cutting groove increases first and then decreases along the second direction.

[0006] In an optional embodiment, the intersection of the wall surface of the cutting groove and the lower end surface of the cutting tooth forms an edge, and the edge is a continuous curve.

[0007] In an optional embodiment, the tangent line of any point on the edge forms an included angle with the lower end surface, 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 relative to the lower end surface gradually increases along the 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 tooth groove line is a continuous curve.

[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, adjacent two cutting teeth form a cutting groove, the direction from the bottom of the cutting groove to the opening of the cutting groove is a second direction, and the width of the cutting groove first increases and then decreases along the second direction.

[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 forms the cutting groove on the blade body, any adjacent two cutting grooves form a cutting tooth, the cutting wheel feeds from the bottom of the cutting groove to the opening of the cutting groove, the cutting wheel tilts towards the lower end of the end 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 into 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 and then formed into 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 heat treatment device performs heat treatment on the blank at a heat treatment temperature in a range of 850 DEG C to 1300 DEG C, and a 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 cutting groove as a whole presents a converging type, has a tendency to accommodate hair, and pushes the uncut hair entering the cutting groove to the center of the cutting groove during the working process, so that the hair entering the cutting groove is effectively cut before being discharged, effectively improving the cutting efficiency of the hair and effectively solving the problem of low hair cutting efficiency caused by poor receiving and discharging effect of the existing razor blade.

[0026] 2. The slope of the tooth groove line is set to gradually increase along the direction away from the blade edge, the slope of the part near the blade edge of the tooth groove line 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, so that the cutting angle of the cutting tooth can be very small while the rigidity of the cutting tooth is ensured, effectively solving the problem that the existing razor blade is difficult to balance sharpness and rigidity.

[0027] 3. Since the cutting angles of different positions of the cutting tooth are different, their rigidities are 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.

[0028] 4. 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

[0029] 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.

[0030] Figure 1 A three-dimensional schematic view of a shaving blade according to an embodiment of the present application;

[0031] Figure 2 A front view of the shaving blade shown in Figure 1

[0032] A sectional view of the shaving blade shown in Figure 3 Figure 1 A sectional view of the shaving blade shown in

[0033] Figure 4 A sectional view of the shaving blade shown in Figure 1

[0034] A sectional view of the shaving blade shown in Figure 5 Figure 4 A sectional view of the shaving blade shown in

[0035] Figure 6 A sectional view of the cutting tooth of the shaving blade shown in Figure 5

[0036] A sectional view of the shaving blade shown in Figure 7 Figure 4 A sectional view of the shaving blade shown in

[0037] Figure 8 A sectional view of the cutting tooth of the shaving blade shown in Figure 7

[0038] A sectional view of the shaving blade shown in Figure 9 Figure 4 A sectional view of the shaving blade shown in

[0039] Figure 10 A sectional view of the cutting tooth of the shaving blade shown in Figure 9

[0040] A sectional view of the cutting tooth of the shaving blade shown in Figure 11 Figure 1 A comparison view of the cutting angle of the cutting tooth of the shaving blade shown in

[0041] Figure 12 A comparison view of the cutting angle of the cutting tooth of the shaving blade shown in Figure 1

[0042] ​​​​​​Figure 13 A comparison diagram of the tooth groove line of the cutting tooth of the shaving blade shown in Figure 1

[0043] Figure 14 A comparison diagram of the blade edge of the shaving blade shown in Figure 1

[0044] Figure 15 A schematic diagram of the preliminary cutting of the manufacturing method of the shaving blade of the embodiment of the present application;

[0045] Figure 16 A schematic diagram of the further cutting of the manufacturing method of the shaving blade shown in Figure 15

[0046] A schematic diagram of the further cutting of the manufacturing method of the shaving blade shown in Figure 17 Figure 16 A schematic diagram of the further cutting of the manufacturing method of the shaving blade shown in

[0047] Figure 18 A schematic diagram of the further cutting of the manufacturing method of the shaving blade shown in Figure 17

[0048] A schematic diagram of the further cutting of the manufacturing method of the shaving blade shown in Figure 19 Figure 18 A schematic diagram of the further cutting of the manufacturing method of the shaving blade shown in

[0049] Figure 20 A schematic diagram of the further cutting of the manufacturing method of the shaving blade shown in Figure 19

[0050] A schematic diagram of the further cutting of the manufacturing method of the shaving blade shown in Figure 21 Figure 20 A schematic diagram of the further cutting of the manufacturing method of the shaving blade shown in

[0051] Explanation of reference signs:

[0052] 1, blade body; 2, cutting tooth; 201, blade edge; 3, cutting groove; 301, tooth groove line; 4, cutting wheel. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not 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.

[0054] The embodiments of the present application will be described below in combination with Figures 1 to 21 .​​​​​

[0055] 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 slot 3 is formed between any two adjacent cutting teeth 2, the direction of the bottom of the cutting slot towards the opening of the cutting slot is a second direction, and the width of the cutting slot increases first and then decreases along the second direction.

[0056] The shaving blade of the present embodiment makes the cutting slot 3 as a whole present a tapering shape, and the cutting slot 3 as a whole has a tendency to accommodate hair. In the working process, the cutting slot 3 pushes the uncut hair entering the cutting slot 3 towards the center of the cutting slot 3, which can ensure that the hair entering the cutting slot 3 is cut effectively before being discharged, effectively improving the cutting efficiency of the hair and effectively solving the problem of low hair cutting efficiency caused by poor receiving and discharging effect of the existing shaving blade.

[0057] In the present embodiment, the intersection of the wall surface of the cutting slot 3 and the lower end surface of the cutting tooth 2 forms an edge 201, and the edge 201 is a continuous curve. As much as possible, each point of the wall surface of the cutting slot 3 can push the hair towards the center of the cutting slot 3, and at the same time, the stress concentration phenomenon at the edge 201 can be effectively reduced to ensure the rigidity of the edge 201.

[0058] Specifically, as shown in Figure 14 the direction of the force of the hair indicated by the arrow, the shape of the cutting slot on the left side is the shape of the cutting slot in the related art, which is V-shaped as a whole. In the working process, the cutting slot of this structure pushes the uncut hair entering the cutting slot 3 outwards, which further affects the cutting efficiency. The shape of the cutting slot 3 on the right side is the shape of the cutting slot 3 of the present embodiment. The cutting slot 3 of the present embodiment presents a tapering shape as a whole, and the slopes of the tangent lines of each point of the edge 201 are different. The cutting slot 3 as a whole has a tendency to accommodate hair. In the working process, the cutting slot 3 of the present embodiment pushes the uncut hair entering the cutting slot 3 towards the center of the cutting slot 3. Compared with the cutting slot in the related art, the cutting slot 3 of the present embodiment can ensure that the hair entering the cutting slot 3 is cut more fully.

[0059] It should be noted that, Figure 14 The shape of the cutting slot 3 on the right side is only a schematic of the shape of the cutting slot 3 of the present embodiment. The side wall of the cutting slot 3 is not limited to the bending degree shown in the figure. The bending degree of the side wall of the cutting slot 3 can be less than or greater than the bending degree shown in the figure, as long as it can form a taper and improve the receiving and discharging effect.

[0060] Further, the wall surface of the cutting groove 3 is at least partially provided with a parabolic profile in the direction parallel to the shearing plane, and correspondingly, at least a part of the cutting edge 201 is also provided with a parabolic profile. The smooth transition of the wall surface of the cutting groove 3 can ensure the rigidity of the cutting blade, in particular the rigidity of each point on the outer periphery of the cutting groove 3, and can also hinder the discharge of the hair to a certain extent, thereby improving the hair cutting efficiency.

[0061] In the present embodiment, the included angle between the tangent of any point on the cutting edge 201 and the lower end surface is the cutting angle. The wall surface of the cutting groove 3 intersects with a plane perpendicular to the lower end surface to form a tooth groove line 301. The slope of each point on the tooth groove line 301 with respect to the lower end surface gradually increases in the direction away from the cutting edge 201, so that the cutting tooth 2 remains sharp while having a corresponding thickness.

[0062] 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 in the direction away from the cutting edge 201. The angle of the cutting angle is not specifically limited here, so that the cutting edge 201 can quickly and effectively cut the hair.

[0063] Specifically, the slope of the tooth groove line 301 is set to gradually increase in the direction away from the cutting edge 201. The slope of the part of the tooth groove line 301 close to the cutting edge 201 is small, so that the cutting edge 201 is sharper. When the cutting tooth 2 extends from the bottom surface to the top surface, the tooth width of the cutting tooth 2 changes nonlinearly, and the reduction speed of the tooth width is slower. Therefore, 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 in 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 existing shaving blade is difficult to balance sharpness and rigidity.

[0064] Specifically, in the related art, in order to ensure that the cutting tooth 2 has a certain thickness, the cutting angle 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 cutting edge 201 at the side wall of the cutting groove 3 is not sharp enough, and only the cutting edge 201 at the part of the cutting groove 3 close to the groove bottom is relatively sharp. When cutting the 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 close to the groove bottom. The hair cutting effect of the cutting tooth 2 in this form is poor. The shaving blade of the present embodiment can make the cutting edge 201 at the side wall of the cutting groove 3 also relatively sharp, so that the entire cutting edge 201 can effectively cut the hair, greatly improving the hair cutting effect.

[0065] The side wall of the cutting tooth 2 is the side wall of the cutting groove 3, which refers to the wall surface on both sides of the cutting groove 3, the tooth width of the cutting tooth 2 refers to the width of the cutting tooth 2 in the direction indicated by the arrow in the figure, and the tooth thickness of the cutting tooth 2 refers to the thickness of the cutting tooth 2 in the direction indicated by the arrow in the figure. Figure 3 The tooth width of the cutting tooth 2 in the direction indicated by the arrow in the figure refers to the width of a single cutting tooth 2 in the direction indicated by the arrow in the figure, and the tooth thickness of the cutting tooth 2 refers to the thickness of a single cutting tooth 2 in the direction indicated by the arrow in the figure. Figure 3 The tooth thickness of the cutting tooth 2 in the direction indicated by the arrow in the figure refers to the thickness of a single cutting tooth 2 in the direction indicated by the arrow in the figure.

[0066] In the embodiment, the cutting angle corresponding to any point on the blade edge 201 is less than 75°, the blade edge 201 as a whole can maintain a sharp state, the hair just contacts the blade edge 201 in the cutting groove 3 and starts to be cut, a part of the uncut hair contacts the blade edge 201 in the middle part of the cutting groove 3 and completes the cutting, and the remaining hair contacts the blade edge 201 at the bottom of the cutting groove 3 and completes the cutting, which can ensure that the hair entering the cutting groove 3 is completely cut.

[0067] Further, as shown in FIGS. 4 and 5, the cross section perpendicular to the extension direction of the cutting tooth 2 is shown in FIG. 4, and the cross section perpendicular to the extension direction of the cutting tooth 2 is shown in FIG. 5. Figure 12 and Figure 13 The cross section perpendicular to the extension direction of the cutting tooth 2 is shown in FIG. 4, and the cross section perpendicular to the extension direction of the cutting tooth 2 is shown in FIG. 5. Figure 12 The cross section perpendicular to the extension direction of the cutting tooth 2 is shown in FIG. 4, and the cross section perpendicular to the extension direction of the cutting tooth 2 is shown in FIG. 5. Figure 13 The cross section perpendicular to the extension direction of the cutting tooth 2 is shown in FIG. 4, and the cross section perpendicular to the extension direction of the cutting tooth 2 is shown in FIG. 5. The extension direction of the cutting tooth 2 is the direction perpendicular to the direction indicated by the arrow in the figure. Figure 3 The extension direction of the cutting tooth 2 is the direction perpendicular to the direction indicated by the arrow in the figure.

[0068] The tooth thickness of the cutting tooth 2 changes with the tooth width as follows:

[0069] Figure 12 The angle of the cutting angle is 70.2°, and the change of the tooth thickness of the non-linear and linear is shown in Table 1.

[0070] 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

[0071] Table 1

[0072] Figure 13 The angle of the cutting angle is 36.5°, and the change of the tooth thickness of the non-linear and linear is shown in Table 2.

[0073] 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

[0074] Table 2

[0075] As can be seen from the above data, 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 of the present embodiment is more obvious when the cutting edge 201 is sharper.

[0076] 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 nonlinear tooth groove line 301 structure of the present embodiment, and are not limited to the above proportion, and can be adjusted as needed.

[0077] It should be noted that the specific change of the nonlinear change of the tooth groove line 301 in the present 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 cutting edge 201 is relatively sharp.

[0078] In the present 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 cutting edge 201 changes continuously along the first direction. Since the angles of the cutting angles at different positions of the cutting tooth 2 are different, their rigidities are also different, and the size of the cutting angle directly affects 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. 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.

[0079] 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.

[0080] Specifically, the angle of the cutting angle ranges from 5° to 75°.

[0081] In the present embodiment, the cutting angle corresponding to each point on the cutting 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, ensuring 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 cutting edge 201 is as small as possible, and the cutting edge 201 is as sharp as possible.

[0082] In the present embodiment, the cutting angle corresponding to each point on the cutting edge 201 gradually decreases along the first direction and then gradually increases.

[0083] Specifically, as shown in Figure 6 , Figure 8 and Figure 10 , the cross sections of the cutting tooth 2 at different positions along the first direction are sequentially shown, 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, and therefore, the cutting angle can ensure the overall rigidity of the cutting tooth 2 while keeping the cutting edge 201 as sharp as possible.

[0084] In the embodiment, the tooth groove line 301 is a continuous curve, so as 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 the position is ensured.

[0085] Specifically, the tooth groove line 301 is a plurality of continuous arc lines, preferably, the tooth groove line 301 is located in the corresponding cross section, and the slope continuously changes, so that Figure 12 or Figure 13 , for example, in the XY coordinate system, the slope k of the tooth groove line 301 at least has a section that rapidly increases from k=tan 5° to k=tan 75° from the bottom surface to the top surface of the cutting tooth 2, and the thickness of the cutting tooth 2 rapidly increases in the direction from the bottom surface to the top surface, and the change is nonlinear, and therefore, when the cutting edge 201 at the position is very sharp, for example, when the cutting edge angle is as small as 5°, the thickness of the other part of the cutting tooth 2 can be rapidly increased, and the overall rigidity of the blade is effectively improved.

[0086] 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 the structure is not easy to produce stress concentration, and therefore, the rigidity of the overall structure is not affected, and the phenomenon of deformation, knife jump and temperature increase during shearing is effectively reduced, and during 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 heat treatment.

[0087] 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, and the wall surface of the cutting groove 3 in the embodiment not only has a faster tooth width at the corresponding position, but also has a smoother wall surface change.

[0088] 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 smoothly connected.

[0089] 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.

[0090] 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.

[0091] 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, the shaving blades shown in the drawings are all 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.

[0092] 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:

[0093] manufacturing the blade body 1; and forming the cutting tooth 2 on the blade body 1 by cutting with the cutting wheel 4.

[0094] The diameter of the cutting wheel 4 is less than or equal to 80 mm, the cutting groove 3 is formed between the adjacent two cutting teeth 2, the bottom of the cutting groove is directed to the second direction, the width of the cutting groove increases first and then decreases along the second direction, 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 blade edge 201.

[0095] 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°.

[0096] 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.

[0097] Further, the specific type of the cutting wheel 4 is not limited, as long as reliable cutting operation can be performed.

[0098] 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.

[0099] In the embodiment, in the step of cutting the cutting tooth 2 on the blade body 1 by the cutting wheel 4,

[0100] 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.

[0101] Specifically, the tooth shape 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 shape 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 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.

[0102] In the embodiment, the step of manufacturing the blade body 1 includes:

[0103] 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.

[0104] 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 cutting blanking processing or rough cutting processing of the tooth. When the tooth is rough cut, the stamping die is added with a 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 tooth shape compared with the cutting tooth, so as to reduce the cutting pressure and improve the tooth cutting efficiency.

[0105] Preferably, the surface of the blank is smooth without defects, no pitted surface, no oil stains, and no scratches.

[0106] In this embodiment, the step of preparing the blank includes:

[0107] The hardness of the blank is obtained, if the hardness of the blank is greater than or equal to the preset hardness, the blank is formed into the blade body 1, and if the hardness of the blank is less than the preset hardness, the blank is heat treated to form the blade body 1.

[0108] In this embodiment, if the hardness of the blank is less than the preset hardness, the step of heat treating the blank includes:

[0109] 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.

[0110] 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 between 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 56. 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.

[0111] Specifically, after the blank is formed into 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.

[0112] 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:

[0113] 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.

[0114] 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 specific 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 to be less than 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 to be less than ± 0.008, and the roughness of the grinding surface can be controlled to be about Ra0.06.

[0115] 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, indentation, scratches, rust, stains and deformation.

[0116] 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:

[0117] 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.

[0118] 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 punching die is increased to have punching tooth function to perform rough cutting and blanking of the product tooth shape, 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.

[0119] 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.

[0120] Step 4: Surface rough polishing, using centrifugal type rolling polishing equipment for polishing processing, the cutting wheel 4 rotates at 40-70r / min.

[0121] Step 5: Tooth profile fine cutting, tooth profile fine cutting uses high-precision numerical control cylindrical grinding cutting equipment, the cutting wheel 4 diameter is between 17 and 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° to 75°. The feed direction of the cutting wheel 4 can be inclined to 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.

[0122] 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.

[0123] 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.

[0124] Step 8: Cleaning and drying: the product surface grinding residual stains are removed by using ultrasonic cleaning method.

[0125] Step 9: Appearance inspection, the appearance defective products such as broken teeth, skewed teeth, indentation, scratch, rust, stain and deformation are picked out by using artificial visual inspection method.

[0126] 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 application relates to a cutting tool, comprising: a tool body (1); a plurality of cutting teeth (2) arranged at intervals on the tool body (1), two adjacent cutting teeth (2) forming a cutting groove (3) therebetween, the direction from the groove bottom of the cutting groove to the groove opening of the cutting groove being a second direction, and the width of the cutting groove increasing first and then decreasing along the second direction; an intersection between the wall surface of the cutting groove (3) and the lower end surface of the cutting tooth (2) forming an edge (201); the included angle between the tangent line of any point on the edge (201) and the lower end surface being a cutting angle, the wall surface of the cutting groove (3) intersecting with a plane perpendicular to the lower end surface to form a tooth groove line (301), the slope of each point on the tooth groove line (301) relative to the lower end surface gradually increasing along the direction away from the edge (201), so that the cutting tooth (2) is kept sharp while having a corresponding thickness; the direction from the groove opening of the cutting groove (3) to the groove bottom of the cutting groove (3) being a first direction, and the cutting angle corresponding to each point on the edge (201) continuously changing along the first direction; the cutting angle corresponding to each point on the edge (201) gradually decreasing along the first direction, or the cutting angle corresponding to each point on the edge (201) gradually decreasing first and then gradually increasing along the first direction. The groove 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).

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

3. A manufacturing method of a shaving blade for manufacturing the shaving blade as claimed in claim 1 or 2, characterized by, The manufacturing method comprises: manufacturing a tool body (1); forming a cutting tooth (2) on the tool body (1) through 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) forming a cutting groove (3) therebetween, the direction from the groove bottom of the cutting groove to the groove opening of the cutting groove being a second direction, and the width of the cutting groove increasing first and then decreasing along the second direction.

4. The method of manufacturing a razor blade according to claim 3, wherein In the step of forming the cutting tooth (2) on the tool body (1) through the cutting wheel (4), the cutting wheel (4) forms the cutting groove (3) on the tool body (1), any two adjacent cutting grooves (3) forming the cutting tooth (2) therebetween, the cutting wheel (4) feeding from the groove bottom of the cutting groove (3) to the groove opening of the cutting groove (3), and the cutting wheel (4) tilting 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 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.

5. The manufacturing method of a shaving blade according to claim 3 or 4, characterized in that, The step of manufacturing the tool body (1) comprises: preparing a blank; processing the blank according to the appearance size of the tool body (1) to form the tool body (1).

6. The method of manufacturing a razor blade according to claim 5, wherein 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 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).

7. The method of manufacturing a razor blade according to claim 6, wherein If the hardness of the blank is less than the preset hardness, the step of heat treating the blank includes: The blank is placed in a heat treatment device, and the heat treatment device heat treats 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; The blank is removed from the heat treatment device after being cooled to a preset temperature range, and the preset temperature range is room temperature to 65°C.

8. The manufacturing method of a razor blade according to claim 3 or 4, characterized by, After the step of cutting the cutting teeth (2) on the blade body (1) by the cutting wheel (4), it further includes: Grinding the surface of the cutting teeth to make the flatness and surface roughness of the cutting teeth (2) reach the preset flatness and preset surface roughness.

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