Split type blade with heat insulation and protection performance and coating method of rubber coating layer

Abstract

The invention relates to a split blade with heat insulation and protection performance and a coating method of a rubber coating layer, the split blade is characterized in that the split blade comprises a blade tooth part and a blade body part which are made of the same and / or different materials and are mutually independent, the rubber coating layer for blocking heat conduction is at least partially coated on the outer surface of the blade tooth part, the thermal conductivity of the rubber coating layer is less than or equal to 2w / mk, and the thermal conductivity of the rubber coating layer is less than or equal to 2w / mk. And the rubber coating layer and the cutter tooth part are made of different materials and are connected into a whole. The blade has the beneficial effects that the blade is split into the blade tooth part and the blade body part which are mutually independent according to functions or purposes of the blade, and the blade is made of the same and / or different materials, so that various technical indexes of the blade tooth part are pertinently improved on the premise of reducing the overall material cost or process cost of the blade. And secondly, the outer surface of the cutter tooth part is coated with the rubber coating layer, so that the heat insulation and protection effects can be achieved, the skin is prevented from being scalded due to the too high surface temperature of the cutter tooth part, the skin is prevented from being stabbed due to the fact that the tooth tips of the cutting teeth in the cutter tooth part are too sharp, and the use safety of the cutter tooth part during use is improved.

Description

Technical Field

[0001] The invention relates to a hair trimming device, and more particularly to a split blade with heat insulation and protection performance and a coating method of a rubber coating layer, which is mainly used in the field of personal care tools such as hair clippers, razors, and hair trimmers. Background Art

[0002] The applicant applied for a patent entitled "Blade and trimming head with heat insulation performance and hair trimming tool" on September 2, 2023, with publication number CN116922456A. ​​In this application, in order to reduce the temperature rise of the blade, an insulation layer is used to separate the blade from the skin. The insulation layer can prevent the skin from being burned by excessive temperature rise of the blade, thereby improving the comfort of the blade. Although adding an insulation layer to the outside of the blade can prevent the skin from being burned, when trimming hair, the blade only needs to use the shear force formed by the teeth in the blade and the teeth in another blade that fits together to form a shear force to cut the hair.

[0003] Existing blades are basically made of metal and are integrated, that is, the blade body and the tooth part are both made of metal and formed in one piece using the same production process, which relatively increases the material cost and production cost of the blade. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a split blade with heat insulation and protection performance and a coating method of a rubber layer. The blade can not only reduce the material cost, but also can be produced by different production processes according to different functions or uses, thereby reducing the material cost and production cost accordingly. In addition, it can also form a heat insulation and protection effect to prevent skin burns due to excessive temperature rise of the blade or punctures due to excessive sharpness, thereby improving the comfort and safety of the blade.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is a split blade with heat insulation and protection performance, including a tooth part and a blade body part made of the same and / or different materials and independent of each other, a plurality of cutting teeth arranged at intervals are provided on the edge of one side of the tooth part, a hair guide groove is formed between adjacent cutting teeth, and the other side relative to the cutting teeth is connected to the blade body part; Among them, at least a part of the outer surface of the blade tooth portion is covered with a rubber layer that blocks heat conduction, the thermal conductivity of the rubber layer is ≤2w / mk, and the rubber layer and the blade tooth portion are made of different materials and connected as a whole.

[0006] Preferably, the rubber layer is flexible and can be elastically deformed when subjected to force.

[0007] Preferably, the tooth portion has at least a tooth surface in contact with the skin and a tooth end face formed in the extension direction of the cutting tooth, and the rubber layer covers at least a portion of the tooth surface and the tooth end face, and is respectively connected to the tooth surface and the tooth end face as a whole.

[0008] Preferably, the tooth portion also has a cutting working surface that fits with the blade for shearing, and the rubber layer is coated on the edge of one side of the cutting tooth on the cutting working surface, so that a protrusion higher than the cutting working surface is formed on the edge of one side of the cutting tooth, and the length of the protrusion is less than the length of the cutting tooth.

[0009] Preferably, a protruding anti-slip structure is provided on the tooth end face of each cutting tooth in the tooth portion, the cross-sectional area of ​​the anti-slip structure is smaller than the cross-sectional area of ​​the tooth end face of each cutting tooth, and the rubber coating is coated on the anti-slip structure so that the rubber coating is connected to the tooth portion as a whole.

[0010] Preferably, the tooth portion includes a toothed side on which a plurality of cutting teeth are provided, and a fixed side connected to the blade body, and the toothed side and the fixed side are integrally formed; a cutting working surface is formed on the toothed side, and the rubber coating layer is coated on the tooth surface, tooth end surface and cutting working surface of the toothed side, and the cutting working surface in the toothed side and the surface of the fixed side are at different levels.

[0011] Preferably, the fixed side is formed at the opposite end of the toothed side where the cutting teeth are arranged, and is flat-plate-shaped and extends outwardly along the end surface of the toothed side, and a plurality of fixing holes are formed on the fixed side.

[0012] Preferably, the tooth portion and the blade body portion are both metal parts and are integrated by screws, rivets or welding; alternatively, the tooth portion is a metal part and the blade body portion is a plastic part, and the tooth portion and the blade body portion are integrated by secondary injection molding, snap connection, buckle connection, bonding or welding.

[0013] Preferably, the rubber coating layer covering the tooth surface in the tooth profile side gradually thickens from the tooth tip direction of the cutting tooth along the tooth root direction, so that the rubber coating layer forms an inclined slope surface.

[0014] Based on the above application of the rubber coating layer to form a split blade with heat insulation and protection performance, the applicant also proposed the following coating methods for the rubber coating layer:

[0015] The first coating method of the rubber layer comprises the following steps:

[0016] E1: The tooth portion and the body portion are formed independently of each other according to the design requirements by powder metallurgy forming process, and then sintered to form a metal blank; wherein the tooth portion is formed with a plurality of cutting teeth and hair guide grooves at one side edge thereof during powder metallurgy forming, and an anti-slip structure is formed on the tooth end face of each cutting tooth; or, The metal sheet is stamped and formed according to the design requirements through a stamping process to form a mutually independent blade tooth portion and a blade body portion metal blank; wherein the blade tooth portion is formed with a plurality of cutting teeth and a hair guide groove at one side edge thereof during stamping, and an anti-slip structure is formed on the tooth end face of each cutting tooth;

[0017] E2: Place the blade teeth part separately into the injection mold for secondary injection molding, so that each outer surface of the blade teeth part is covered with the rubber layer;

[0018] E3: Grind the surface of the blade teeth relative to the skin contact surface, remove the partial rubber layer, and form a cutting working surface in the blade teeth;

[0019] E4: Finally, the teeth and the body are fixed together by screws, rivets or welding to form a split blade with heat insulation and protection performance.

[0020] The second coating method of the rubber layer comprises the following steps:

[0021] E1: The tooth portion and the body portion are formed independently of each other according to the design requirements by powder metallurgy forming process, and then sintered to form a metal blank; wherein the tooth portion is formed with an anti-slip structure during powder metallurgy forming; or, The metal sheet is stamped and formed according to the design requirements through a stamping process to form metal blanks of a tooth portion and a body portion which are independent of each other; wherein an anti-slip structure is formed on the end surface of the tooth portion during stamping;

[0022] E2: Place the blade teeth part separately into the injection mold for secondary injection molding, so that each outer surface of the blade teeth part is covered with the rubber layer;

[0023] E3: Cutting one side edge of the blade tooth portion covering the rubber layer by a cutting device to form a plurality of cutting teeth and hair guide grooves arranged at intervals;

[0024] E4: Grind the surface of the blade teeth relative to the skin contact surface, remove the partial rubber layer, and form a cutting working surface in the blade teeth;

[0025] E5: Finally, the teeth and the body are fixed together by screws, rivets or welding to form a split blade with heat insulation and protection performance.

[0026] The third coating method of the rubber layer comprises the following steps:

[0027] E1: The blade tooth portion is formed according to the design requirements by a powder metallurgy forming process, and then sintered to form a metal blank; wherein the blade tooth portion is formed with a plurality of cutting teeth and a hair guide groove at one side edge thereof during the powder metallurgy forming process, and an anti-slip structure is formed on the tooth end face of each cutting tooth; or, The metal sheet is stamped and formed according to the design requirements through a stamping process to form a metal blank of a blade tooth portion; wherein the blade tooth portion is formed with a plurality of cutting teeth and a hair guide groove at one side edge thereof during stamping, and an anti-slip structure is formed on the tooth end face of each cutting tooth;

[0028] E2: Place the blade teeth into an injection mold for secondary injection molding, so that each outer surface of the blade teeth is covered with a rubber layer;

[0029] E3: Grind the surface of the blade teeth relative to the skin contact surface to remove the rubber layer and form a cutting working surface in the blade teeth;

[0030] E4: Finally, the blade teeth covered with the rubber layer are placed in an injection mold and then a blade body connected to the blade teeth is manufactured through a secondary injection molding process to form a split blade with heat insulation and protection performance; or, An independent blade body is manufactured according to design requirements through an injection molding process, and then the blade teeth and the blade body are connected as a whole to form a split blade with heat insulation and protection performance.

[0031] The beneficial effects of the present invention are:

[0032] 1. The blade is split into independent tooth parts and body parts according to its function or purpose, and made of the same and / or different materials. This can improve the technical indicators or performance of the tooth part without increasing or reducing the overall material cost or process cost of the blade.

[0033] 2. The outer surface of the blade teeth is covered with a rubber layer. When the blade teeth are heated up due to friction, the rubber layer can play a heat insulation role, preventing the skin from being burned by the excessively high surface temperature of the blade teeth, thus improving the comfort of the blade when in use. Secondly, the rubber layer can also play a protective role, preventing the tips of the cutting teeth in the blade teeth from being too sharp and piercing the skin, thus improving the safety of the blade teeth when in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A three-dimensional assembly structure diagram of the first embodiment of the split blade with heat insulation and protection performance according to the present invention

[0035] Figure 2 A three-dimensional assembly exploded view of the first embodiment of the split blade with heat insulation and protection performance according to the present invention

[0036] Figure 3 This is a cross-sectional structural diagram of the assembly of the first embodiment of the split blade with heat insulation and protection performance according to the embodiment of the present invention.

[0037] Figure 4 The three-dimensional structure diagram of the blade teeth and the three-dimensional enlarged structure diagram of the anti-slip structure in the embodiment of the present invention are shown in FIG.

[0038] Figure 5 A three-dimensional enlarged structural diagram of the second embodiment of the anti-slip structure in the embodiment of the present invention

[0039] Figure 6A perspective exploded view of a second embodiment of a split blade having heat insulation and protection performance according to an embodiment of the present invention

[0040] Figure 7 A three-dimensional assembly structure diagram of a second embodiment of a split blade with heat insulation and protection performance according to an embodiment of the present invention

[0041] Figure 8 This is a cross-sectional structural diagram of the assembly of the second embodiment of the split blade with heat insulation and protection performance according to the embodiment of the present invention. DETAILED DESCRIPTION

[0042] The following is combined with Figures 1 to 8 The embodiments of the present invention are further described as follows:

[0043] The blade is an important part of a hair clipper, a razor or a shaver. The blade can be a static blade or a dynamic blade used in a hair clipper, a razor or a shaver. However, no matter whether the static blade or the dynamic blade in the existing hair clipper, a razor or a shaver is a one-piece structure, only one part of the tooth part of the blade is needed to trim the hair. Therefore, removing one part of the tooth part, the rest is only for the convenience of assembling the blade. Therefore, using a single metal material and the same production process for all blades will obviously increase the overall material cost and production cost of the blade.

[0044] In view of this, the technical team of the applicant proposed a technical solution that can reduce the material cost and / or production cost of the blade:

[0045] The blade includes a toothed portion 1 and a body portion 2 made of the same and / or different materials and independent of each other, and the blade is split into the toothed portion 1 and the body portion 2, so that different technical indicators can be set according to the functions and uses of the toothed portion 1 and the body portion 2, and different metal powder ratios and production processes can be selected according to different technical indicators to reduce the material cost and production cost of the blade. For example, when the toothed portion 1 is used to trim hair, it needs to frequently contact the skin and the sharper blade edge, and the skin will secrete oil and sweat, which is corrosive to a certain extent. Therefore, higher requirements are placed on the material hardness and corrosion resistance of the tooth portion 1. When mixing metal powders, it is necessary to appropriately increase the alloy or rare earth powder that can improve the material hardness and corrosion resistance, so as to specifically improve the various technical indicators and performance of the tooth portion 1. The body portion 2 is only used for the installation and fixation of the tooth portion 1, and there are no higher requirements on the material hardness and corrosion resistance. Therefore, ordinary metal powder can be used. During heat treatment, the heating temperature and heating time will be different from those of the tooth portion 1, and the production cost will be lower than that of the tooth portion 1, thereby reducing the overall material cost and production cost of the blade.

[0046] The powder metallurgy forming process is an existing mature technology. Since the present application does not involve the improvement of metal powder ratio and process parameters, it will not be described in detail in this embodiment.

[0047] In order to facilitate the introduction and trimming of hair, a plurality of spaced cutting teeth 3 are provided on one edge of the toothed portion 1 during powder forming, and hair guide grooves 4 are formed between adjacent cutting teeth 3. In order to facilitate the assembly of the toothed portion 1, the other side of the toothed portion 1 relative to the cutting teeth 3 is connected to the blade body 2. During assembly, the blade body 2 can be used to fix the toothed portion 1 to ensure that the blade fits the mating blade, so that a shear force is formed between each cutting tooth 3 in the toothed portion 1 and the cutting teeth 3 in the mating blade to cut the hair.

[0048] During the hair trimming process, two blades that fit each other form a reciprocating motion to cut the hair. During the reciprocating motion, the two blades cause the surface temperature of the blades to rise due to the high-frequency friction, which can easily burn the skin when in contact with the blade surface. In response to this, the applicant has proposed the following technical solution, namely: at least a portion of the outer surface of the blade tooth portion 1 is coated with a rubber layer 5 that blocks heat conduction, the thermal conductivity of the rubber layer 5 is ≤2w / mk, and the rubber layer 5 and the blade tooth portion 1 are made of different materials and connected as a whole. When trimming hair, in most cases only the blade tooth portion 1 is in contact with the skin, and at least a portion of the outer surface of the blade tooth portion 1 is covered with a rubber layer 5 that can block heat conduction. When the blade tooth portion 1 has a high temperature rise due to friction, the rubber layer 5 can play a heat-insulating role, preventing the skin from being burned by the excessively high surface temperature of the blade tooth portion 1, thereby improving the comfort of the blade when in use. Secondly, the rubber coating layer 5 can also play a protective role, preventing the tips of the cutting teeth 3 in the blade tooth part 1 from being too sharp and piercing the skin, thereby improving the safety of the blade tooth part 1 when in use.

[0049] In actual production, the rubber layer 5 in principle covers the entire surface of the blade teeth 1 in contact with the skin, and its thickness is set to be no less than 0.2 mm. The outer surface of the connection between the blade teeth 1 and the blade body 2 does not need to be provided, thereby saving the covering area of ​​the rubber layer 5 and reducing costs.

[0050] Under the premise of preventing skin burns, in order to improve the comfort of blade use, the rubber coating 5 is a flexible body and can be elastically deformed when subjected to force. It is preferably PP thermoplastic plastic. Of course, ABS, PA, PC, POM and PVC can also be used. The rubber coating 5 is made of plastic with certain flexibility and elasticity. When the tooth part 1 contacts the skin and bears external force, the rubber coating 5 with certain flexibility and elasticity can play a certain protective role on the skin, avoid scratching the skin and make the skin feel more comfortable, thereby improving the comfort of blade use. Secondly, PP also has certain high temperature resistance and corrosion resistance, which can not only block heat, but also prevent the surface temperature of the tooth part 1 from rising and scalding the skin, thereby improving the safety of blade use; at the same time, after the blade is used, the tooth part 1 will be cleaned with clean water. The good corrosion resistance can also prevent the rubber coating 5 from being eroded by the oil or sweat secreted by the skin, thereby improving the hygienic safety of the tooth part 1 and extending the service life of the tooth part 1.

[0051] The toothed portion 1 at least has a tooth surface 11 in contact with the skin, and a tooth end surface 12 formed in the extending direction of the cutting teeth 3. When trimming hair, in most cases, only the tooth surface 11 and the tooth end surface 12 of the toothed portion 1 frequently contact the skin. Therefore, the rubber coating 5 mainly covers at least a part of the tooth surface 11 and the tooth end surface 12, and is connected to the tooth surface 11 and the tooth end surface 12 as a whole. By providing the rubber coating 5 on the tooth surface 11 and the tooth end surface 12 of the toothed portion 1, not only can the surface temperature of the toothed portion 1 be prevented from rising too high and scalding the skin, but also the tooth tips of each cutting tooth 3 in the toothed portion 1 can be prevented from being too sharp and piercing the skin, thereby improving the comfort and safety of the blade.

[0052] In order to reduce the friction resistance of the blade when it swings back and forth to cut hair, reduce the temperature rise of the tooth portion 1 and lower the surface temperature of the tooth portion 1, the tooth portion 1 also has a cutting working surface 13 that fits with the blade for shearing, and the rubber layer 5 is coated on the edge of one side of the cutting tooth 3 on the cutting working surface 13, so that a protrusion 51 higher than the cutting working surface 13 is formed on the edge of one side of the cutting tooth 3, and the length of the protrusion 51 is less than the length of the cutting tooth 3. In actual production, the entire surface of the tooth portion 1 that contacts the skin or the area that cooperates with the relative blade can be covered with a rubber coating 5, and then the entire plane or the cooperative area can be ground by a grinding process to remove the rubber coating 5, so that a cutting working surface 13 is formed on the tooth portion 1, and the distance between the edge of the tooth portion 1 and the grinding wheel can be controlled, so that a protrusion 51 higher than the cutting working surface 13 is formed at the edge of one side of each cutting tooth 3 in the tooth portion 1 (i.e., the tooth tip of the cutting tooth 3). By using this protrusion 51, not only can the end of the cutting tooth 3 be blocked from directly contacting the skin, thus preventing the skin from being scalded and improving the comfort of use; at the same time, the protrusion 51 can also play a protective role, avoiding the skin from being pierced by the excessively sharp tooth tip of the cutting tooth 3, thereby improving the safety of the tooth portion 1 when it contacts the skin; and the protrusion 51 can also isolate the teeth in the cooperating blade from contacting the skin, thus avoiding the teeth in the cooperating blade from cutting the skin. Secondly, by grinding the surface of the blade tooth portion 1 relative to the surface in contact with the skin to form a cutting working surface 13, the surface flatness of the cutting working surface 13 can be effectively improved, the friction resistance when cutting hair in reciprocating motion can be reduced, and the surface temperature rise of the blade tooth portion 1 can be effectively reduced, thereby achieving the purpose of reducing the surface temperature of the blade tooth portion 1.

[0053] In order to enhance the connection firmness between the rubber coating 5 and the tooth portion 1, a protruding anti-slip structure 6 is provided on the tooth end face 12 of each cutting tooth 3 in the tooth portion 1. The cross-sectional area of ​​the anti-slip structure 6 is smaller than the cross-sectional area of ​​the tooth end face 12 of each cutting tooth 3. The rubber coating 5 is coated on the outside of the anti-slip structure 6 so that the rubber coating 5 and the tooth portion 1 are connected as a whole. By setting the cross-sectional area of ​​the anti-slip structure 6 to be smaller than the cross-sectional area of ​​the tooth end face 12 of each cutting tooth 3, when the rubber coating 5 is coated on the tooth end face 12 of each cutting tooth 3, the rubber coating 5 can be flush with both sides of each cutting tooth 3, preventing the rubber coating 5 from occupying the space at the opening of the hair guide groove 4 and affecting the introduction of hair. In actual production, the anti-slip structure 6 is in the shape of a step, or is in the shape of a sheet with an open groove, such as the attached Figures 4-5 As shown, the anti-slip structure 6 is provided to improve the connection firmness between the rubber coating layer 5 and the blade tooth portion 1. The anti-slip structure 6 can be used as long as it can play the role of connection firmness. In this embodiment, only two structures that are easy to produce are given, which does not mean that only the attached structure can be used. Figures 4-5 The structure shown in the figure can be modified as necessary according to the actual product structure.

[0054] In order to maximize the role of the rubber coating 5 and reduce the processing difficulty of the rubber coating 5, the tooth portion 1 includes a toothed side 14 provided with a plurality of cutting teeth 3, and a fixed side 15 connected to the blade body 2, and the toothed side 14 and the fixed side 15 are integrally formed; the cutting working surface 13 is formed on the toothed side 14, and the rubber coating 5 is coated on the tooth surface 11, the tooth end surface 12 and the cutting working surface 13 of the toothed side 14, and the cutting working surface 13 and the surface of the fixed side 15 in the toothed side 14 are at different horizontal planes. Since the fixed side 15 of the toothed portion 1 is only used for connection and fixation with the blade body 2, the fixed side 15 does not need to be covered by the rubber coating 5, so that the coverage area of ​​the rubber coating 5 can be reduced, and the material cost of the rubber coating 5 and the difficulty of injection molding can be reduced. The cutting working surface 13 in the toothed side 14 and the surface of the fixed side 15 are placed at different horizontal planes. When trimming hair with a matching blade, the matching blade can be set to an arch shape to reduce the contact area between the two blades, thereby reducing the friction resistance and the overall temperature rise of the blade when trimming hair in a reciprocating motion, thereby improving the comfort of using the blade.

[0055] In order to facilitate the connection and fixation of the toothed portion 1 and ensure the connection firmness between the toothed portion 1 and the blade body 2, the fixed side 15 is formed at the opposite end of the toothed side 14 where the cutting teeth 3 are arranged, and is in the shape of a flat plate extending outward along the end surface of the toothed side 14, and a plurality of fixing holes 151 are formed on the fixed side 15. The fixed side 15 is set in the shape of a flat plate and is provided with a plurality of fixing holes 151. During installation, the fixed side 15 in the toothed portion 1 can be connected to the blade body 2 as a whole by inserting screws into the fixing holes 151, thereby ensuring the connection firmness between the toothed portion 1 and the blade body 2. Of course, the fixed side 15 can also be connected to the blade body 2 as a whole by means of clamping, bonding, welding, etc. The specific connection structure can be determined according to the actual structure of the blade body 2, and is not further limited in this embodiment.

[0056] In the actual production process, the blade teeth 1 and the blade body 2 can be made of the same metal material. After the blade teeth 1 and the blade body 2 are formed, they can be screwed, riveted or welded together. Of course, other methods known to the public can also be used to achieve the connection and fixation of the blade teeth 1 and the blade body 2. Therefore, the fixing methods listed in this embodiment cannot constitute a limitation on this application. If the blade teeth 1 and the blade body 2 are made of different materials, such as the blade teeth 1 is a metal part and the blade body 2 is a plastic part, the blade teeth 1 and the blade body 2 can be integrally formed by secondary injection molding; or, the independent metal blade teeth 1 and the plastic blade body 2 are connected together by snap connection, buckle connection, bonding or ultrasonic welding. No matter which structure is used, its purpose is to ensure the assembly and fixation of the blade teeth 1. Therefore, as long as the above purpose can be achieved, the blade teeth 1 and the blade body 2 can also use the above-mentioned methods that are not listed but known to the public.

[0057] In order to improve the operating comfort of the blade when trimming hair, the rubber layer 5 covering the tooth surface 11 in the tooth-shaped side 14 gradually thickens from the tooth tip direction of the cutting tooth 3 to the tooth root direction, so that the rubber layer 5 forms an inclined slope. By setting the rubber layer 5 with an inclined slope, when trimming hair, the angle between the blade and the skin can be increased, and the distance between the hair trimming tool such as a hair clipper, a razor or a shaver and the skin can be adjusted, which is convenient for the user to operate and improves the operating comfort; and it can also facilitate the blade tooth part 1 to slide along the skin surface, and when the blade tooth part 1 contacts the skin, it forms an optimal trimming angle with the skin, thereby improving the hair trimming efficiency.

[0058] On the basis of using the rubber coating layer 5 to form a split blade with heat insulation and protection performance, the applicant also proposed the following coating methods of the rubber coating layer 5:

[0059] Example 1

[0060] The following steps are involved:

[0061] E1: The tooth part 1 and the body part 2 are formed independently of each other according to the design requirements through the powder metallurgy forming process, and then sintered to form a metal blank. During the powder metallurgy forming, different proportions of metal powders can be selected according to the different functions or uses of the tooth part 1 and the body part 2, or alloys or rare earth powders with different properties can be mixed, such as:

[0062] Trimming hair requires that the blade tooth portion 1 has a relatively sharp cutting edge, so the blade tooth portion 1 has relatively high requirements on the material hardness; in addition, the hair is more or less adhered to oil and sweat secreted by the skin, and the blade tooth portion 1 is basically rinsed with clean water after trimming the hair, which also correspondingly has higher requirements on the corrosion resistance of the blade tooth portion 1. When the blade tooth portion 1 is formed by powder metallurgy, it is necessary to add alloy or rare earth powder to improve the hardness and corrosion resistance.

[0063] The blade body 2 only needs to fix the blade tooth part 1, mainly to assist in the assembly of the blade tooth part 1, and has no special requirements for hardness and corrosion resistance. In this way, ordinary metal powder can be used for molding. When the molded blade body 2 is heat-treated, an ordinary heat treatment process can be used. The heating temperature or heating time will be lower and shorter than that of the blade tooth part 1, thereby achieving the purpose of reducing material costs and process costs.

[0064] Compared with the existing integrated blades, the use of split blades (i.e., the tooth portion 1 and the body portion 2 are independent of each other) not only specifically improves the technical indicators of the tooth portion 1 (such as hardness, sharpness and corrosion resistance, etc.), and improves the performance of the tooth portion 1; at the same time, it reduces the use of some special materials and reduces the overall material cost and process cost of the blade.

[0065] In order to improve the hair trimming efficiency, the blade tooth part 1 is integrally formed with a plurality of cutting teeth 3 and a hair guide groove 4 at one side edge thereof during powder metallurgy forming, for the introduction and trimming of hair. Since it is necessary to block the heat dissipation of the blade tooth part 1 to avoid scalding the user's skin and preventing the cutting teeth 3 from stabbing the skin, an anti-slip structure 6 is formed on the tooth end face 12 of each cutting tooth 3 during powder metallurgy forming of the blade tooth part 1. Through the anti-slip structure 6, the connection firmness of the rubber coating layer 5 formed in the subsequent process with the blade tooth part 1 can be significantly improved.

[0066] Since the powder metallurgy forming process is an existing mature method for processing metal parts, its parameters such as powder type, phase, forming pressure, sintering temperature and time are well known to technical personnel in this field, and the innovation of the present application is not here, therefore, in this embodiment, the various steps and process parameters in the powder metallurgy forming technology are not described in detail.

[0067] E2: Put the blade tooth part 1 into the injection mold for secondary injection molding, so that each outer surface of the blade tooth part 1 is covered by the rubber layer 5. Due to the size of the blade tooth part 1, the surface temperature rise of the blade tooth part 1 is not high during operation. For the purpose of blocking the temperature and preventing the skin from being burned, only a thin layer of rubber layer 5 is needed to cover the surface of the blade tooth part 1. However, in actual production, due to the limitation of the injection molding machine, the actual thickness of the rubber layer 5 is not less than 0.2 mm, which is also the minimum injection molding thickness of most common injection molding machines.

[0068] E3: Grind the surface of the tooth portion 1 relative to the skin contact surface, remove the partial rubber coating 5, and form a cutting working surface 13 in the tooth portion 1; the tooth portion 1 needs to fit with the end face of the matching blade to generate shear force when working. Due to the coverage limitation of the rubber coating 5, the tooth portion 1 cannot fit completely with the matching blade. Therefore, it is necessary to grind the surface of the tooth portion 1 that fits with the matching blade to remove the rubber coating 5 on the end face of the tooth portion 1 that fits with the matching blade, so as to facilitate the end face fit between the tooth portion 1 and the matching blade to generate shear force.

[0069] During the grinding process, not only the covering rubber layer 5 needs to be removed, but also the metal surface of the tooth portion 1 needs to be cut to improve the flatness of the cutting working surface 13. The higher the flatness, the smaller the friction resistance between the tooth portion 1 and the mating blade, so that the surface temperature rise of the tooth portion 1 is lower during operation.

[0070] Secondly, during grinding, the distance between the grinding wheel and the edge of the tooth portion 1 can be controlled to retain the rubber coating 5 at the tooth tip of each cutting tooth 3 to form a protrusion 51. This can prevent the tooth tip of each cutting tooth 3 in the tooth portion 1 from being too hot and scalding the skin, thereby forming a heat-insulating effect. At the same time, the protrusion 51 can also play a protective role, preventing the tooth tip of each cutting tooth 3 from being too sharp and piercing the skin, thereby forming a protective effect.

[0071] E4: Finally, the tooth portion 1 and the blade body portion 2 are fixed together by screws, rivets or welding to form a split blade with heat insulation and protection performance. Of course, there are many ways to connect the tooth portion 1 and the blade body portion 2 together. The screws, rivets and welding selected above are very common and mature connection methods, which does not mean that only the above-mentioned connection methods can be used. In addition, technicians in this field can also choose other methods well known to technicians in this field for fixed connection according to actual needs, and no further restrictions are made in this embodiment.

[0072] The innovation of this embodiment is to make the tooth part 1 and the blade body part 2 adopt independent structures, focus on improving the various performance indicators (such as hardness, corrosion resistance, etc.) of the tooth part 1 which plays the main role or purpose, and then select a material different from the tooth part 1 to make the blade body part 2 which plays an auxiliary role to reduce the overall material cost and process cost of the blade; finally, the tooth part 1 is coated to form a rubber coating 5 to block temperature and prevent stabbing. Therefore, when coating to form the rubber coating 5, the surface of the tooth part 1 can be coated with the rubber coating 5 alone; or, the tooth part 1 and the blade body part 2 can be connected as a whole and then the surface of the tooth part 1 is coated to form the rubber coating 5. Secondly, after the tooth part 1 is coated alone, the independent tooth part 1 and the end face of the matching blade can be ground to form a cutting surface; or, the coated tooth part 1 and the blade body part 2 can be connected as a whole and then the tooth part 1 can be ground to form a cutting working surface 13.

[0073] Those skilled in the art should be aware that such adjustment of the sequence of process steps will not have a substantial impact on the formation of the rubber coating layer 5 and the cutting working surface 13. Therefore, the above-disclosed process steps and changes in the sequence of process steps are within the protection scope of this embodiment.

[0074] Example 2

[0075] Under the overall concept of embodiment 1, the powder metallurgy forming process can also be replaced by a stamping forming process, including the following steps:

[0076] E1: The metal sheet is stamped and formed according to the design requirements through a stamping process to form metal blanks of the tooth portion 1 and the body portion 2 which are independent of each other; during stamping, different materials can be selected to form the tooth portion 1 and the body portion 2 according to their different functions or uses, for example:

[0077] Trimming hair requires a relatively sharp blade, which has relatively high requirements for material hardness. In addition, the hair is more or less adhered to oil and sweat secreted by the skin, and the tooth portion 1 is mostly rinsed with clean water after trimming the hair, which correspondingly puts higher requirements on the corrosion resistance of the tooth portion 1. Metal sheets with higher hardness and corrosion resistance can be selected for stamping during stamping.

[0078] The blade body 2 only needs to fix the blade tooth part 1, mainly to assist in the assembly of the blade tooth part 1, and does not have high requirements for hardness and corrosion resistance. In this way, ordinary metal sheets can be used for stamping. When the blade body 2 is heat treated after forming, ordinary heat treatment process can be adopted, which can reduce the heating temperature or reduce the heating time, thereby achieving the purpose of reducing material cost and process cost.

[0079] Compared with the existing integrated blades, the use of split blades (i.e., the tooth portion 1 and the body portion 2 are independent of each other) not only specifically improves the technical indicators of the tooth portion 1 (such as hardness, sharpness and corrosion resistance, etc.), and improves the performance of the tooth portion 1; at the same time, it reduces the use of some special materials and reduces the overall material cost and process cost of the blade.

[0080] In order to improve the hair trimming efficiency, a plurality of cutting teeth 3 and hair guide grooves 4 are integrally formed at one side edge of the blade tooth portion 1 during stamping and forming, for the introduction and trimming of hair. Since it is necessary to block the heat dissipation of the blade tooth portion 1 to avoid scalding the user's skin and preventing the cutting teeth 3 from stabbing the skin, an anti-slip structure 6 is formed on the tooth end face 12 of each cutting tooth 3 during stamping and forming of the blade tooth portion 1. Through the anti-slip structure 6, the connection firmness of the rubber coating layer 5 formed in the subsequent process with the blade tooth portion 1 can be significantly improved.

[0081] Since the stamping process is an existing mature method for processing metal products, its stamping equipment, stamping pressure, and parameters such as heating temperature and time during heat treatment are well known to technical personnel in this field, and the innovation of the present application is not here, therefore, in this embodiment, the various steps in the stamping process and the process parameters of the heat treatment are not described in detail.

[0082] E2: Put the blade tooth part 1 into the injection mold for secondary injection molding, so that each outer surface of the blade tooth part 1 is covered with the rubber layer 5; due to the size of the blade tooth part 1, the surface temperature rise of the blade tooth part 1 is not high during operation. For the purpose of blocking the temperature and preventing the skin from being burned, only a thin layer of rubber layer 5 is needed to cover the surface of the blade tooth part 1. However, in actual production, due to the limitation of the injection molding machine, the actual thickness of the rubber layer 5 is not less than 0.2mm, which is also the minimum injection molding thickness of most ordinary injection molding machines.

[0083] E3: Grind the surface of the tooth portion 1 relative to the skin contact surface, remove the partial rubber coating 5, and form a cutting working surface 13 in the tooth portion 1; the tooth portion 1 needs to fit with the end face of the matching blade to generate shear force when working. Due to the coverage limitation of the rubber coating 5, the tooth portion 1 cannot fit completely with the matching blade. Therefore, it is necessary to grind the surface of the tooth portion 1 that fits with the matching blade to remove the rubber coating 5 on the end face of the tooth portion 1 that fits with the matching blade, so as to facilitate the end face fit between the tooth portion 1 and the matching blade to generate shear force.

[0084] During the grinding process, not only the covering rubber layer 5 needs to be removed, but also the metal surface of the tooth portion 1 needs to be cut to improve the flatness of the cutting working surface 13. The higher the flatness, the smaller the friction resistance between the tooth portion 1 and the mating blade, so that the surface temperature rise of the tooth portion 1 is lower during operation.

[0085] Secondly, during grinding, the distance between the grinding wheel and the edge of the tooth portion 1 can be controlled to retain the rubber coating 5 at the tooth tip of each cutting tooth 3 to form a protrusion 51. This can prevent the tooth tip of each cutting tooth 3 in the tooth portion 1 from being too hot and scalding the skin, thereby forming a heat-insulating effect. At the same time, the protrusion 51 can also play a protective role, preventing the tooth tip of each cutting tooth 3 from being too sharp and piercing the skin, thereby forming a protective effect.

[0086] E4: Finally, the tooth portion 1 and the blade body portion 2 are fixed together by screws, rivets or welding to form a split blade with heat insulation and protection performance. Of course, there are many ways to connect the tooth portion 1 and the blade body portion 2 together. The screws, rivets and welding selected above are very common and mature connection methods, which does not mean that only the above-mentioned connection methods can be used. In addition, technicians in this field can also choose other methods well known to technicians in this field for fixed connection according to actual needs, and no further restrictions are made in this embodiment.

[0087] Similar to the first embodiment, the surface of the blade tooth portion 1 can be coated to form the rubber coating 5; or the blade tooth portion 1 and the blade body portion 2 can be connected as a whole before coating the blade tooth portion 1 to form the rubber coating 5. Secondly, after the blade tooth portion 1 is coated, the independent blade tooth portion 1 can be ground to form the cutting working surface 13; or the coated blade tooth portion 1 and the blade body portion 2 can be connected as a whole, and then the blade tooth portion 1 can be ground to remove the partial rubber coating 5 and form the cutting working surface 13.

[0088] Those skilled in the art should be aware that such adjustment of the sequence of process steps will not have a substantial impact on the formation of the rubber coating layer 5 and the cutting working surface 13. Therefore, the above-disclosed process steps and changes in the sequence of process steps are within the protection scope of this embodiment.

[0089] Example 3

[0090] Under the overall concept of the above-mentioned embodiment 1 or 2, the applicant can also achieve the expected technical purpose and produce the expected technical effect by adjusting the molding sequence of the cutting teeth 3, including the following steps:

[0091] E1: The tooth portion 1 and the body portion 2 are formed independently of each other according to the design requirements by a powder metallurgy forming process, and sintered to form a metal blank; wherein the tooth portion 1 is formed with an anti-slip structure 6 during the powder metallurgy forming process;

[0092] E2: The blade tooth part 1 is placed in an injection mold for secondary injection molding, so that each outer surface of the blade tooth part 1 is covered by the rubber layer 5;

[0093] E3: Cutting one side edge of the tooth portion 1 covering the rubber layer 5 by a cutting device to form a plurality of cutting teeth 3 and hair guide grooves 4 arranged at intervals;

[0094] E4: Grinding the surface of the blade tooth portion 1 relative to the surface in contact with the skin, removing the partial rubber layer 5 and forming a cutting working surface 13 in the blade tooth portion 1;

[0095] E5: Finally, the blade teeth portion 1 and the blade body portion 2 are fixed together by screws, rivets or welding to form a split blade with heat insulation and protection performance.

[0096] The difference between this embodiment and embodiments 1 and 2 is that in the powder metallurgy forming step, the cutting teeth 3 and the hair guide grooves 4 are not integrally formed in the blade tooth part 1, so that it is easier to form the rubber layer 5 by laminating the blade tooth part 1. After the rubber layer 5 is formed, the tooth cutting operation is performed to form a plurality of cutting teeth 3 and the hair guide grooves 4, which can significantly simplify the injection mold structure of the rubber layer 5, improve the injection molding efficiency of the rubber layer 5, and reduce the injection mold cost. However, the disadvantage is that the rubber layer 5 may be separated from the blade tooth part 1 during tooth cutting. Compared with embodiments 1 and 2, each has its own advantages and disadvantages.

[0097] Example 4

[0098] Under the overall concept of the above-mentioned embodiment 1 or 2, the applicant can also achieve the expected technical purpose and produce the expected technical effect by adjusting the molding sequence of the cutting teeth 3, including the following steps:

[0099] E1: The metal sheet is stamped and formed according to the design requirements through a stamping process to form metal blanks of a tooth portion 1 and a body portion 2 which are independent of each other; wherein an anti-slip structure 6 is formed on the end surface of the tooth portion 1 during stamping;

[0100] E2: The blade tooth part 1 is placed in an injection mold for secondary injection molding, so that each outer surface of the blade tooth part 1 is covered by the rubber layer 5;

[0101] E3: Cutting one side edge of the tooth portion 1 covering the rubber layer 5 by a cutting device to form a plurality of cutting teeth 3 and hair guide grooves 4 arranged at intervals;

[0102] E4: Grinding the surface of the blade tooth portion 1 relative to the surface in contact with the skin, removing the partial rubber layer 5 and forming a cutting working surface 13 in the blade tooth portion 1;

[0103] E5: Finally, the blade teeth portion 1 and the blade body portion 2 are fixed together by screws, rivets or welding to form a split blade with heat insulation and protection performance.

[0104] The difference between this embodiment and embodiments 1 and 2 is that in the stamping step, the cutting teeth 3 and the hair guide grooves 4 are not integrally formed in the tooth portion 1, which makes it easier to coat the tooth portion 1 with films to form the rubber coating 5. After the rubber coating 5 is formed, the tooth cutting operation is performed to form a plurality of cutting teeth 3 and the hair guide grooves 4, which can significantly simplify the injection mold structure of the rubber coating 5 and reduce the cost of the injection mold. However, the disadvantage is that the rubber coating 5 may be separated from the tooth portion 1 during tooth cutting. Compared with embodiments 1 and 2, each has its own advantages and disadvantages.

[0105] Example 5

[0106] Based on the concept of the independent tooth portion 1 and the blade body portion 2 in the above embodiments 1 to 4, the applicant can also solve the same technical problem and produce the same technical effect by changing the molding process of the blade body portion 2, including the following steps:

[0107] E1: The blade tooth portion 1 is formed according to the design requirements by a powder metallurgy forming process, and sintered to form a metal blank; wherein the blade tooth portion 1 is formed with a plurality of cutting teeth 3 and a hair guide groove 4 at one side edge thereof during powder metallurgy forming, and an anti-slip structure 6 is formed on the tooth end face 12 of each cutting tooth 3;

[0108] E2: placing the blade tooth portion 1 into an injection mold for secondary injection molding, so that each outer surface of the blade tooth portion 1 is covered by the rubber layer 5;

[0109] E3: Grinding the surface of the blade tooth portion 1 relative to the surface in contact with the skin, removing the rubber layer 5 and forming a cutting working surface 13 in the blade tooth portion 1;

[0110] E4: Finally, the blade tooth portion 1 covered with the rubber layer 5 is placed in an injection mold, and then the blade body portion 2 connected to the blade tooth portion 1 is manufactured through a secondary injection molding process to form a split blade with heat insulation and protection performance; or, An independent blade body 2 is manufactured according to design requirements through an injection molding process, and then the blade teeth 1 and the blade body 2 are connected as a whole to form a split blade with heat insulation and protection performance.

[0111] The difference between this embodiment and embodiments 1 to 4 is that the blade body 2 is a plastic part, and is integrally formed with the blade tooth part 1 by secondary injection molding. Alternatively, an independent blade body 2 is made by an injection molding machine, and then connected with the blade tooth part 1 as a whole.

[0112] Example 6

[0113] Based on the concept of the independent tooth portion 1 and the blade body portion 2 in the above embodiments 1 to 4, the applicant can also solve the same technical problem and produce the same technical effect by changing the molding process of the blade body portion 2, including the following steps:

[0114] E1: The metal sheet is stamped and formed according to the design requirements through a stamping process to form a metal blank of a toothed portion 1; wherein, the toothed portion 1 is formed with a plurality of cutting teeth 3 and a hair guide groove 4 at one side edge thereof during stamping, and an anti-slip structure 6 is formed on the tooth end face 12 of each cutting tooth 3;

[0115] E2: placing the blade tooth portion 1 into an injection mold for secondary injection molding, so that each outer surface of the blade tooth portion 1 is covered by the rubber layer 5;

[0116] E3: Grinding the surface of the blade tooth portion 1 relative to the surface in contact with the skin, removing the rubber layer 5 and forming a cutting working surface 13 in the blade tooth portion 1;

[0117] E4: Finally, the blade tooth portion 1 covered with the rubber layer 5 is placed in an injection mold and then a blade body portion 2 connected to the blade tooth portion 1 is manufactured through a secondary injection molding process to form a split blade with heat insulation and protection performance; or, An independent blade body 2 is manufactured according to design requirements through an injection molding process, and then the blade teeth 1 and the blade body 2 are connected as a whole to form a split blade with heat insulation and protection performance.

[0118] The difference between this embodiment and embodiments 1 to 4 is that the blade body 2 is a plastic part, and is integrally formed with the metal blade tooth part 1 by secondary injection molding. Alternatively, an independent blade body 2 is made by an injection molding machine, and then connected to the blade tooth part 1 as a whole.

[0119] The above embodiments should not be regarded as limiting the present invention, but any improvements made based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A split blade with heat insulation and protection performance, characterized by The invention comprises a tooth portion (1) and a body portion (2) made of the same and / or different materials and independent of each other, a plurality of cutting teeth (3) arranged at intervals are arranged on one edge of the tooth portion (1), a hair guide groove (4) is formed between adjacent cutting teeth (3), and the other side of the cutting teeth (3) is connected to the body portion (2); At least part of the outer surface of the blade tooth portion (1) is coated with a rubber coating (5) for blocking heat conduction, the thermal conductivity of the rubber coating (5) is ≤2w / mk, and the rubber coating (5) and the blade tooth portion (1) are made of different materials and connected as a whole.

2. The split blade with heat insulation and protection performance according to claim 1, characterized in that The rubber coating (5) is flexible and can be elastically deformed when subjected to force.

3. The split blade with heat insulation and protection performance according to claim 1, characterized in that The tooth portion (1) at least comprises a tooth surface (11) in contact with the skin, and a tooth end surface (12) formed in the extending direction of the cutting tooth (3); the rubber coating (5) covers at least a part of the tooth surface (11) and the tooth end surface (12), and is respectively connected to the tooth surface (11) and the tooth end surface (12) as a whole.

4. The split blade with heat insulation and protection performance according to claim 1, characterized in that The tooth portion (1) further comprises a cutting working surface (13) which fits with a blade for shearing, and the rubber coating (5) covers an edge of one side of the cutting tooth (3) on the cutting working surface (13), so that a protrusion (51) higher than the cutting working surface (13) is formed on the edge of one side of the cutting tooth (3), and the length of the protrusion (51) is less than the length of the cutting tooth (3).

5. The split blade with heat insulation and protection performance according to claim 1, characterized in that A protruding anti-slip structure (6) is provided on the tooth end surface (12) of each cutting tooth (3) in the blade tooth portion (1), the cross-sectional area of ​​the anti-slip structure (6) being smaller than the cross-sectional area of ​​the tooth end surface (12) of each cutting tooth (3), and the rubber coating (5) is coated on the outside of the anti-slip structure (6) so that the rubber coating (5) and the blade tooth portion (1) are connected as a whole.

6. The split blade with heat insulation and protection performance according to claim 1, characterized in that The toothed portion (1) comprises a toothed side (14) provided with a plurality of cutting teeth (3), and a fixed side (15) connected to the blade body (2), wherein the toothed side (14) and the fixed side (15) are integrally formed; a cutting working surface (13) is formed on the toothed side (14), a rubber coating layer (5) is coated on a tooth surface (11), a tooth end surface (12) and a cutting working surface (13) of the toothed side (14), and the cutting working surface (13) in the toothed side (14) and a surface of the fixed side (15) are located at different levels.

7. The split blade with heat insulation and protection performance according to claim 6, characterized in that The fixed side (15) is formed at the opposite end of the toothed side (14) where the cutting teeth (3) are arranged, and is in the shape of a flat plate extending outwardly along the end surface of the toothed side (14), and a plurality of fixing holes (151) are formed on the fixed side (15).

8. The split blade with heat insulation and protection performance according to claim 1, characterized in that The blade tooth portion (1) and the blade body portion (2) are both metal parts and are integrated by screws, riveting or welding; or the blade tooth portion (1) is a metal part and the blade body portion (2) is a plastic part, and the blade tooth portion (1) and the blade body portion (2) are integrated by secondary injection molding, snap connection, buckle connection, bonding or welding.

9. The split blade with heat insulation and protection performance according to claim 6, characterized in that The rubber coating (5) covering the tooth surface (11) of the tooth profile side (14) gradually thickens from the tooth tip direction of the cutting tooth (3) along the tooth root direction, so that the rubber coating (5) forms an inclined slope surface.

10. A coating method of a rubber coating layer, applied to a split blade with heat insulation and protection performance as claimed in any one of claims 1 to 9, characterized in that The following steps are involved: E1: A tooth portion (1) and a body portion (2) are formed independently of each other according to design requirements through a powder metallurgy forming process, and sintered to form a metal blank; wherein the tooth portion (1) is formed with a plurality of cutting teeth (3) and a hair guide groove (4) at one side edge thereof during powder metallurgy forming, and an anti-slip structure (6) is formed on the tooth end surface (12) of each cutting tooth (3); or, The metal sheet is stamped and formed according to the design requirements through a stamping process to form metal blanks of a tooth portion (1) and a body portion (2) which are independent of each other; wherein the tooth portion (1) is formed with a plurality of cutting teeth (3) and hair guide grooves (4) at one side edge thereof during stamping, and an anti-slip structure (6) is formed on the tooth end face (12) of each cutting tooth (3); E2: placing the blade tooth part (1) alone into an injection mold for secondary injection molding, so that each outer surface of the blade tooth part (1) is covered by the rubber layer (5); E3: grinding the surface of the blade tooth portion (1) relative to the surface in contact with the skin, removing the partial rubber coating layer (5) and forming a cutting working surface (13) in the blade tooth portion (1); E4: Finally, the blade teeth (1) and the blade body (2) are fixed together by screws, rivets or welding to form a split blade with heat insulation and protection performance.

11. A coating method for a rubber coating layer, applied to a split blade with heat insulation and protection performance as claimed in any one of claims 1 to 9, characterized in that The following steps are involved: E1: forming a tooth portion (1) and a body portion (2) independently of each other according to design requirements through a powder metallurgy forming process, and sintering them to form a metal blank; wherein the tooth portion (1) is formed with an anti-slip structure (6) during powder metallurgy forming; or, The metal sheet is stamped and formed according to the design requirements through a stamping process to form metal blanks of a tooth portion (1) and a body portion (2) which are independent of each other; wherein an anti-slip structure (6) is formed on the end surface of the tooth portion (1) during the stamping process; E2: placing the blade tooth part (1) alone into an injection mold for secondary injection molding, so that each outer surface of the blade tooth part (1) is covered by the rubber layer (5); E3: using a cutting device to cut the edge of one side of the tooth portion (1) covering the rubber coating layer (5) to form a plurality of cutting teeth (3) and hair guide grooves (4) arranged at intervals; E4: grinding the surface of the blade tooth portion (1) relative to the surface in contact with the skin, removing the partial rubber coating layer (5) and forming a cutting working surface (13) in the blade tooth portion (1); E5: Finally, the blade teeth (1) and the blade body (2) are fixed together by screws, rivets or welding to form a split blade with heat insulation and protection performance.

12. A coating method for a rubber coating layer, applied to a split blade with heat insulation and protection performance as claimed in any one of claims 1 to 9, characterized in that The following steps are involved: E1: The tooth portion (1) is formed according to design requirements by a powder metallurgy forming process, and sintered to form a metal blank; wherein the tooth portion (1) is formed with a plurality of cutting teeth (3) and hair guide grooves (4) at one side edge thereof during powder metallurgy forming, and an anti-slip structure (6) is formed on the tooth end surface (12) of each cutting tooth (3); or, The metal sheet is stamped and formed according to design requirements through a stamping process to form a metal blank of a toothed portion (1); wherein the toothed portion (1) is formed with a plurality of cutting teeth (3) and hair guide grooves (4) at one side edge thereof during stamping, and an anti-slip structure (6) is formed on the tooth end surface (12) of each cutting tooth (3); E2: placing the blade tooth portion (1) into an injection mold for secondary injection molding, so that each outer surface of the blade tooth portion (1) is covered by the rubber layer (5); E3: grinding the surface of the blade tooth portion (1) relative to the surface in contact with the skin, removing the rubber coating (5) and forming a cutting working surface (13) in the blade tooth portion (1); E4: Finally, the blade tooth portion (1) covered with the rubber layer (5) is placed in an injection mold and then a blade body portion (2) connected to the blade tooth portion (1) is manufactured through a secondary injection molding process to form a split blade with heat insulation and protection performance; or, An independent blade body (2) is manufactured according to design requirements through an injection molding process, and then the blade teeth (1) and the blade body (2) are connected as a whole to form a split blade with heat insulation and protection performance.

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