A blade unit, a razor blade, and a method for manufacturing the razor blade.

Abstract

This invention discloses a blade unit for a razor blade, integrally molded from ceramic material, including a fan-shaped base. The base has several upward-protruding blades, each wider at the bottom and narrower at the top. A grinding surface is provided at the upper end of each blade, forming a cutting edge at the tip. The base has a mounting structure for installation. The base is a fan-shaped block with a small area, making it less prone to breakage. This invention also discloses a razor blade unit including a base. A drive seat is provided at the bottom of the base. m blade units (m ≥ 3) are arranged circumferentially on the base to form a blade. Adjacent blade units are separated, resulting in a lightweight and impact-resistant design that reduces the risk of ceramic blade breakage. This invention further discloses a simple and easily mass-producible method for manufacturing razor blades for industrial applications.

Description

[Technical Field]

[0001] This invention relates to a blade unit, a razor blade, and a method for manufacturing a razor blade. [Background Technology]

[0002] Existing razor blades are typically made of metal. In recent years, with the pursuit of high-performance razors, ceramic blades have emerged. Ceramic blades are increasingly being developed and researched due to their advantages such as good antibacterial properties, high hardness, non-deformation, sharpness, stable performance, and rust resistance. However, due to the inherent properties of ceramic materials, their shrinkage rate during molding is very high, and the shrinkage often varies between different batches, resulting in significant dimensional variations after molding. Furthermore, ceramic materials are brittle and fragile. For razor blades that require high-speed rotation, they need to maintain high reliability and structural strength during high-speed rotation. This has kept much research at the theoretical level, preventing the industrial-scale production and application of razors.

[0003] For example, the patent technology of the zirconia special ceramic turbine electric shaver head, as disclosed in announcement number CN206344182U, has its moving blade assembly and connecting parts made of special zirconia ceramic material. The disclosed moving blade assembly is like a blooming flower, with a small central disc and blades connected to the circumference of the disc spreading outwards, which makes it easy to break. The structural strength is difficult to meet the usage requirements of the shaver. Moreover, the ceramic material connecting parts are dimensionally unstable and are prone to play when connected to the external drive device, which is not conducive to transmission. During high-speed rotation transmission, it is also prone to problems such as high friction and high noise.

[0004] For example, the patent technology for ceramic blades and shavers, with announcement number CN207630083U, describes a ceramic blade structure where the blade body is mounted on a disc-shaped body and directly injection molded to a support base. The support base covers the entire bottom of the ceramic blade, and the ceramic blade is also covered by the support base. Therefore, the ceramic blade will not crack or shatter upon drop, improving its safety. This technology solves the problem of the fragile structure of ceramic blades. However, in actual production applications, the large shrinkage rate of ceramic blades causes many production problems. For example, during one-piece injection molding, the mold needs to position the ceramic blade inside the mold and seal areas where glue is not needed, such as the upper middle part of the blade body, the blade itself, and the cutting edge, to prevent molten plastic from entering these areas under high pressure during injection molding. However, due to the high shrinkage rate and poor dimensional stability of ceramic cutters, it is difficult for molds to accurately position the ceramic cutters and completely seal multiple holes. This makes it difficult to avoid the presence of plastic in other undesirable areas after injection molding, resulting in poor mass production.

[0005] This invention was made in response to the aforementioned problems. [Summary of the Invention]

[0006] The technical problem to be solved by the present invention is to provide a blade unit with a simple structure and that is not easily broken for use in a razor blade.

[0007] To solve the above-mentioned technical problems, the present invention provides a blade unit for a razor blade, which is integrally formed from ceramic material and includes a fan-shaped base. The base has several upwardly protruding blades, which are thicker at the bottom and thinner at the top. The upper end of the blade has a grinding surface, and the grinding surface forms a cutting edge at the tip of the blade. The base has a mounting structure for mounting.

[0008] As described above, in one type of blade unit, the blade body has one row or two rows, and the blade bodies are evenly arranged along the circumferential direction in each row.

[0009] In the blade unit described above, when the blade body has two rows, the inner and outer rows of blades are concentric, the number of blades in the outer row is greater than that in the inner row, and the inner and outer rows of blades are staggered.

[0010] As described above, in one type of blade unit, the fan-shaped structure of the chassis consists of an outer arc surface, an inner surface, and left and right sides connecting the outer arc surface and the inner surface.

[0011] As described above, in one type of blade unit, the central angle n of the chassis is less than 120°, and the outer row of blades has four or fewer blades.

[0012] As described above, in one type of blade unit, the mounting structure includes two or more positioning holes, and the top surface of the chassis is provided with a groove corresponding to the positioning holes.

[0013] As described above, in one type of blade unit, the chassis has a limiting boss protruding inward, and the bottom of the chassis has a positioning groove recessed upward.

[0014] As described above, in one type of blade unit, an arc-shaped through hole is provided on the chassis and on the front side of the blade body to relieve stress on the chassis.

[0015] Another technical problem to be solved by the present invention is to provide a razor blade with a simple structure that is easy to mass-produce and apply in industrial applications.

[0016] To solve the above-mentioned technical problems, the present invention provides a circular razor blade with the aforementioned blade unit, including a base, a drive seat at the bottom of the base, and m blade units arranged in a circumferential direction on the base to form a blade, wherein m≥3, and adjacent blade units are separated from each other.

[0017] As described above, in a circular razor blade, the base and chassis are fixed together by assembly. The base and drive seat are integrally injection molded from plastic. The mounting structure on the chassis includes two or more positioning holes. The base is provided with a fixing post passing through the positioning holes. The fixing post fixes the blade unit to the base by hot-melt deformation.

[0018] As described above, in a circular razor blade, the top surface of the base is provided with a groove corresponding to the positioning hole, and the groove is pressed in after the fixing post is heat-melted and deformed.

[0019] As described above, in a circular razor blade, the base has a downwardly recessed fan-shaped placement groove corresponding to the chassis. The placement groove has an inner side wall and two side walls on the left and right sides, with its outer side open to allow the outer arc surface of the chassis to be exposed.

[0020] As described above, in a circular razor blade, the base is circular, and the outer arc surface of the base plate corresponds to the circumferential surface of the base.

[0021] As described above, in a circular razor blade, the base protrudes inward with a limiting boss, the bottom of the base has an upwardly recessed positioning groove, the inner wall of the placement groove is provided with a limiting groove that is recessed and allows the limiting boss to engage, and the bottom of the placement groove is provided with an upwardly protruding positioning post that cooperates with the positioning groove.

[0022] As described above, a circular razor blade has an arc-shaped through hole on the base and located on the front side of the blade body to relieve stress on the base. The upper end of the blade body extends forward and is directly above the arc-shaped through hole. The base and located on the front side of each blade body have a chip removal hole.

[0023] Another technical problem to be solved by the present invention is to provide a simple processing method for a circular razor blade that is easy to mass-produce in an industrial setting.

[0024] To solve the above-mentioned technical problems, the present invention provides a method for processing a circular blade of a razor, comprising the following steps:

[0025] A. Separately mold ceramic and plastic parts: Inject ceramic material into the blade unit mold cavity to obtain semi-finished product a after molding. Semi-finished product a includes a fan-shaped base and several upwardly protruding and concentrically arranged blades. The base is provided with positioning holes. Inject plastic material into the base mold cavity to obtain semi-finished product b after molding. Semi-finished product b includes a base. A drive seat is formed at the bottom of the base. An upwardly facing fixing post is formed on the base. The fixing post is clearance-fitted with the positioning hole.

[0026] B. Grinding: Grinding the upper end of the tool body on semi-finished product a to obtain semi-finished product c;

[0027] C. Assemble semi-finished products c and b: Align the positioning holes with the fixing posts and pre-install semi-finished product c onto semi-finished product b. After assembly, the fixing posts protrude above the positioning holes. Install the corresponding number of semi-finished products c onto semi-finished product b according to the design.

[0028] D. The fixing column is heat-melted and deformed from top to bottom. The part of the fixing column in the positioning hole becomes larger and fits tightly with the positioning hole. At the same time, the rubber material deforms outward and presses the chassis to fix the chassis on the base to obtain the semi-finished product d.

[0029] E. Grinding: Grind the blade on the semi-finished product d according to the design requirements, forming a grinding surface at the upper end of the blade and a cutting edge at the tip of the blade.

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] 1. The blade unit of the present invention has a fan-shaped base, which is small in area and not easily broken. By supporting the corresponding blades on several fan-shaped blocks, they can be arranged to form a razor blade, avoiding the risk of easy breakage of ceramic discs that are used in ceramic disc structures. Moreover, due to the small size of the blade unit, even if the ceramic material has a relatively large shrinkage rate, by setting a scaling ratio in advance during the design, even if the actual shrinkage rate fluctuates around the scaling ratio during production, the difference between the resulting product sizes will not be too large, thus facilitating the achievement of a relatively stable size. At the same time, the fan-shaped base can provide a certain installation area, which is beneficial for setting up an installation structure and fixing it to the base to form a razor blade that can be rotated and driven.

[0032] 2. The razor blade of the present invention consists of m blade units evenly arranged around the circumference of the base to form a blade. That is, the blade is divided into m equal parts. The blade units are manufactured independently and then assembled into a blade for use in the razor. This can reduce the weight of the razor blade, improve the impact resistance of the razor blade, reduce the risk of ceramic blade breakage, and has a simple structure, good balance, and is suitable for high-speed rotation.

[0033] 3. The razor blade of the present invention has a base and a drive base that are integrally injection molded from plastic. The mounting structure on the base includes two positioning holes. The base is provided with a fixing post that passes through the positioning holes. Before the fixing post is heat-fused, the fixing post and the positioning hole are in clearance fit. The positioning hole is larger than the fixing post so that even if there are size differences in the base during molding, it can still be installed on the fixing post. At the same time, the fixing post protrudes above the positioning hole to facilitate heat fusion. During heat fusion, the rubber material on the fixing post deforms, and the part in the positioning hole becomes larger and fits tightly with the positioning hole. At the same time, the rubber material deforms outward and presses against the base to fix the blade unit on the base. The connection is stable and reliable, the structure is simple, and it is easy to assemble and produce.

[0034] 4. The processing method of the circular blade of the razor of the present invention is simple and easy to realize industrial mass production. The ceramic material blade is not easy to break and has good safety. Moreover, the ceramic blade unit is firmly connected to the base, which can meet the requirements of high-speed rotation shaving. At the same time, it also solves the problem that the large shrinkage rate of ceramic material leads to unstable product size and makes it impossible to mass-produce industrially. [Attached Image Description]

[0035] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0036] Figure 1 This is a top view of a blade unit according to the present invention;

[0037] Figure 2 This is a bottom view of a blade unit according to the present invention;

[0038] Figure 3 This is an exploded view of a circular razor blade according to the present invention;

[0039] Figure 4 This is a schematic diagram of the structure of a razor blade pre-mounted on a base according to the present invention;

[0040] Figure 5 This is a schematic diagram of the structure of a razor blade fixed on a base according to the present invention;

[0041] Figure 6 This is a schematic diagram of the bottom structure of a circular blade razor according to the present invention.

Detailed Implementation Methods

[0042] The present invention will now be further described with reference to the accompanying drawings:

[0043] like Figures 1 to 2 The blade unit 10 shown is used for a razor blade. It is integrally formed from ceramic material and includes a fan-shaped base 1. The base 1 has several upwardly protruding blades 2, and the blades 2 are thicker at the bottom and thinner at the top to increase the structural strength of the blades 2 on the base 1. The upper end of the blades 2 has a grinding surface 3, which is formed by grinding the upper end of the blades 2. The grinding surface 3 has a cutting edge 4 at the tip of the blade. The tip of the blade refers to the direction of rotation when the razor blade rotates. The base 1 has a mounting structure for installation. The structure is simple.

[0044] The base is a fan-shaped block, which is small in area and not easily broken. By supporting the corresponding blades on several fan-shaped blocks, the razor blades can be formed, avoiding the risk of easy breakage of ceramic discs. Moreover, due to the small size of the blade unit 10, even if the ceramic material has a relatively large shrinkage rate, by setting a scaling ratio in advance during the design, even if the actual shrinkage rate fluctuates around the scaling ratio during production, the difference between the resulting product dimensions will not be too large. This helps to obtain a relatively stable size. At the same time, the fan-shaped base provides a certain installation area, which is conducive to setting up an installation structure and fixing it to the base to form a razor blade that can be rotated and driven.

[0045] Additionally, the chassis has a fan-shaped structure, on which multiple blades can be mounted. These blades can be assembled from a small number of blade units 10 to form the razor blades, such as... Figure 3 and Figure 4 The embodiment shown illustrates that the blade can be assembled from three blade units 10, thereby simplifying the structure of the razor blade and reducing the manufacturing difficulty of the razor blade.

[0046] To accommodate the rotary shaver with its inner and outer ring cutting mechanism, the blade body 2 has two rows, inner and outer. Each row of blade bodies 2 is evenly arranged circumferentially, and the inner and outer rows of blade bodies 2 are concentric. Alternatively, the blade body 2 can have only one row, providing a single-ring cutting function, or, as needed, multiple rows of blade bodies 2 can be used to achieve multi-ring cutting; illustrations are omitted here.

[0047] The number of blades 2 in the outer row is greater than that in the inner row, and the two rows of blades 2 are staggered, which can effectively utilize the characteristics of the fan-shaped chassis that is wider on the outside and narrower on the inside to reasonably arrange the blades.

[0048] Preferably, the central angle n of the chassis 1 is less than 120°, and the outer row of the blades 2 is provided with no more than four blades, so that the chassis 1 is not easily broken or fractured.

[0049] Preferably, the fan-shaped structure of the chassis 1 consists of an outer arc surface 11, an inner side surface 12, and left and right side surfaces connecting the outer arc surface 11 and the inner side surface 12. Preferably, the inner side surface 12 is also an arc surface. Figures 3 to 5 As shown, when multiple blade units 10 surround the blades that make up the razor, the chassis forms a ring structure, leaving a central space so that a central positioning hole 27 aligned with the foil can be formed on the base. Figure 2 and Figure 3 As shown, in order to make multiple chassis 1 form a circle around the circumference, a gap is left between two adjacent chassis 1 to better fit the base installation. The left and right sides connecting the outer arc surface 11 and the inner side surface 12 can be offset by two radii R passing through the two ends of the outer arc surface 11.

[0050] like Figures 3 to 6The illustrated shaver round blade includes the aforementioned blade unit 10 and base 20. The base 20 has a drive seat 21 at its bottom. The base 20 has m blade units 10 evenly arranged around its circumference to form a blade, where m ≥ 3. Adjacent blade units 10 are separated from each other, that is, the blade is divided into m equal parts. The blade units are manufactured independently and then assembled into a blade for use in the shaver. This reduces the weight of the shaver round blade, improves its impact resistance, reduces the risk of ceramic blade breakage, and has a simple structure, good balance, and is suitable for high-speed rotation. Preferably, the blades are divided into three equal parts, consisting of three identical blade units 10. This reduces the volume of the base 1, provides space for installation, and avoids increasing assembly difficulty due to an excessive number of blades. The central angle n of the base 1 in the blade unit 10 is between 100° and 110°, so that a certain gap is left between two adjacent blade units 10 for easy installation. Moreover, the three blade units 10 stand on three legs, which helps to form three fulcrums to support the razor's foil, thus forming a stable support structure.

[0051] Preferably, the base 20 and the chassis 1 are fixed together by assembly. The base 20 can be a plastic part or a metal part, and is connected and fixed to the mounting structure on the chassis 1, such as by using rivets or screws with washers.

[0052] Preferably, the base 20 and the drive seat 21 are integrally injection molded from plastic. The mounting structure on the chassis 1 includes two positioning holes 6. The base 20 is provided with fixing posts 22 passing through the positioning holes 6. The fixing posts 22 fix the blade unit 10 to the base 20 by hot-melt deformation. By restricting the chassis 1 with the two fixing posts 22, it is possible to better prevent the chassis 1 from loosening during high-speed rotation. Figure 4 As shown, before the fixing post 22 is heat-fused, the fixing post 22 and the positioning hole 6 are in clearance fit. The positioning hole 6 is larger than the fixing post 22 so that even if the chassis 1 has size differences during molding, it can still be installed on the fixing post 22. At the same time, the fixing post 22 protrudes above the positioning hole 6 to facilitate heat fusion. During heat fusion, the rubber material on the fixing post 22 deforms, and the part in the positioning hole 6 becomes larger and fits tightly with the positioning hole 6. At the same time, the rubber material deforms outward and presses against the chassis 1, as shown. Figure 5 The structure shown after hot-melt fixation has a stable and reliable connection, a simple structure, and is easy to assemble and produce.

[0053] Preferably, the top surface of the chassis 1 is provided with a groove 7 corresponding to the positioning hole 6. The groove 7 is pressed into the fixing column 22 after it is heat-melted and deformed, so that the upper end of the fixing column 22 forms a stable shape and presses on the chassis 1, and can also prevent the fixing column 22 from protruding obviously above the chassis 1.

[0054] like Figures 3 to 5In the illustrated embodiment, the base 20 has a downwardly recessed fan-shaped placement groove 23 corresponding to the base plate 1. The placement groove 23 has an inner side wall and two side walls on the left and right sides, with its outer side open to allow the outer arc surface of the base plate 1 to be exposed. This structure helps to reduce the volume of the shaver blades. Preferably, the base 20 is circular, and the outer arc surface of the base plate 1 corresponds to the circumferential surface of the base 20. In addition, the placement groove 23, in conjunction with the base plate 1, strengthens the positioning and connection between the base plate 1 and the base 20, improving the connection stability between the base plate 1 and the base 20 during high-speed rotation.

[0055] Furthermore, the chassis 1 has a limiting boss 8 protruding inward, and the bottom of the chassis 1 has a positioning groove 9 recessed upward. The inner wall of the placement groove 23 is provided with a limiting groove 24 that is recessed and allows the limiting boss 8 to be inserted. The bottom of the placement groove 23 is provided with a positioning post 25 that protrudes upward and cooperates with the positioning groove 9, which further improves the connection stability between the chassis 1 and the base 20 during high-speed rotation.

[0056] By positioning the placement slot 23 with the chassis 1, positioning the limiting boss 8 with the limiting slot 24, and positioning the positioning slot 9 with the positioning post 25, the clearance fit between the positioning hole 6 and the fixing post 22, as well as the installation error caused by the dimensional difference due to the uneven shrinkage of the blade unit 10, are reduced.

[0057] The base 1 has an arc-shaped through hole 5 on its front side for relieving stress on the cutter body 2. The upper end of the cutter body 2 extends forward and is directly above the arc-shaped through hole 5. Another function of the arc-shaped through hole is to allow the mold to pass through to shape the cutter body. The arc-shaped through hole also reduces the weight of the entire base and facilitates chip removal. The base 20 has a chip removal hole 26 on the front side of each cutter body 2 for easy chip removal. It should be noted that when the front side of the cutter body 2 corresponds to the front side of the base 1, the front side of the cutter body 2 belongs to the outer side of the base 1. This outer space is available for the mold to shape the cutter body and facilitates chip removal.

[0058] A method for manufacturing the above-mentioned circular blade of a razor includes the following steps:

[0059] A. Separately mold ceramic parts and plastic parts: Inject ceramic material into the mold cavity of the blade unit, and after molding, a semi-finished product a is obtained. The semi-finished product a includes a fan-shaped base plate 1 and several upward-protruding and concentrically arranged blade bodies 2. The base plate 1 is provided with positioning holes 6.

[0060] Plastic material is injected into the base mold cavity and molded to obtain a semi-finished product b. The semi-finished product b includes a base 20. A drive seat 21 is formed at the bottom of the base 20. An upward-facing fixing post is formed on the base 20. The fixing post is clearance-fitted with the positioning hole 6.

[0061] B. Grinding: Grind the upper end of the cutter body on semi-finished product a to remove some material and smooth it out to obtain semi-finished product c;

[0062] C. Assemble semi-finished products c and b: Align the positioning hole 6 with the fixing post and pre-install semi-finished product c onto semi-finished product b. After assembly, the fixing post protrudes above the positioning hole 6. Install the corresponding number of semi-finished products c on semi-finished product b according to the design.

[0063] D. The fixing column is heat-melted and deformed from top to bottom. The part of the fixing column 22 in the positioning hole 6 becomes larger and fits tightly with the positioning hole 6. At the same time, the rubber material deforms outward and presses the base plate 1 to fix the base plate 1 on the base 20 to obtain the semi-finished product d.

[0064] E. Grinding: Grind the blades on the semi-finished product d simultaneously according to the design requirements to eliminate the height difference caused by the assembly of the blades 2 on different blade units, form a uniform grinding surface 3 on the upper end of different blades 2, and form a cutting edge 4 at the tip of the front end of the blade 2.

[0065] The above processing method is simple and easy to mass-produce in an industrial setting. The ceramic blade is not easy to break and has good safety. Moreover, the ceramic blade unit is firmly connected to the base, which can meet the requirements of high-speed rotation shaving. At the same time, it also solves the problem that the large shrinkage rate of ceramic materials leads to unstable product dimensions and makes it impossible to mass-produce in an industrial setting.

Claims

1. A blade unit (10) for use in a razor blade, characterized in that: Made of ceramic material in one piece, including a fan-shaped base (1), on which are provided several upwardly protruding blades (2), the blades (2) being thicker at the bottom and smaller at the top, the upper end of the blades (2) extending forward, the upper end of the blades (2) being provided with a grinding surface (3), the grinding surface (3) forming a cutting edge (4) at the tip of the front end of the blade, the base (1) being provided with a mounting structure for installation, the blades (2) having one row or two rows, the blades (2) being evenly arranged along the circumferential direction in each row.

2. The blade unit (10) according to claim 1, characterized in that: When the blade (2) has two rows, inner and outer, the inner and outer rows of blades (2) are at the same center, the number of blades (2) in the outer row is more than the number of blades (2) in the inner row, and the inner and outer rows of blades (2) are staggered.

3. The blade unit (10) according to claim 1, characterized in that: The fan-shaped structure of the chassis (1) consists of an outer arc surface (11) and an inner side surface (12), as well as left and right sides connecting the outer arc surface (11) and the inner side surface (12). The central angle n of the chassis (1) is less than 120°, and the outer row of the blade body (2) has four or fewer.

4. A blade unit (10) according to any one of claims 1 to 3, characterized in that: The mounting structure includes two or more positioning holes (6), and the top surface of the chassis (1) is provided with a groove (7) corresponding to the positioning hole (6).

5. A round blade for razors, characterized in that: The device includes a base (20) and a blade unit (10). The base (20) has a drive seat (21) at its bottom. The base (20) has m blade units (10) arranged around the circumference to form a blade, where m ≥ 3. Adjacent blade units (10) are separated. The blade unit (10) is integrally formed from ceramic material and includes a fan-shaped base (1). The base (1) has several upward-protruding blades (2), which are thicker at the bottom and smaller at the top. The upper end of the blades (2) extends forward. The upper end of the blades (2) has a grinding surface (3). The grinding surface (3) forms a cutting edge (4) at the tip of the blade. The base (1) has an installation structure for installation. The blades (2) have one row or two rows, and the blades (2) are evenly arranged around the circumference in each row.

6. A round razor blade according to claim 5, characterized in that: When the blade (2) has two rows, inner and outer, the inner and outer rows of blades (2) are at the same center, the number of blades (2) in the outer row is more than the number of blades (2) in the inner row, and the inner and outer rows of blades (2) are staggered.

7. A round razor blade according to claim 5, characterized in that: The fan-shaped structure of the chassis (1) consists of an outer arc surface (11) and an inner side surface (12), as well as left and right sides connecting the outer arc surface (11) and the inner side surface (12). The central angle n of the chassis (1) is less than 120°, and the outer row of the blade body (2) has four or fewer.

8. A round razor blade according to any one of claims 5 to 7, characterized in that: The base (20) and the chassis (1) are fixed together by assembly. The base (20) and the drive seat (21) are integrally injection molded plastic. The mounting structure on the chassis (1) includes two or more positioning holes (6). The base (20) is provided with a fixing post (22) that passes through the positioning hole (6). The fixing post (22) fixes the blade unit (10) on the base (20) by hot melt deformation. The top surface of the chassis (1) is provided with a groove (7) corresponding to the positioning hole (6). The groove (7) is pressed into the fixing post (22) after hot melt deformation.

9. A round razor blade according to claim 8, characterized in that: The base (20) is recessed downward to form a fan-shaped placement groove (23) corresponding to the chassis (1). The placement groove (23) has an inner side wall and two side walls on the left and right sides, and its outer side is open to allow the outer arc surface of the chassis (1) to be exposed.

10. A method for processing a circular blade of a razor, comprising the following steps: A. Separately mold ceramic and plastic parts: Inject ceramic material into the mold cavity of the blade unit, and after molding, obtain semi-finished product a, wherein semi-finished product a includes a fan-shaped base (1). The base (1) has a number of upward-protruding and concentrically arranged blades (2), and a positioning hole (6) is provided on the base (1). Plastic material is injected into the base mold cavity and a semi-finished product b is obtained after molding. The semi-finished product b includes a base (20), a drive seat (21) is formed at the bottom of the base (20), and an upward-facing fixing column is formed on the base (20). The fixing column is in clearance fit with the positioning hole (6). B. Grinding: Grinding the upper end of the tool body on semi-finished product a to obtain semi-finished product c; C. Assemble semi-finished products c and b: Position the positioning hole (6) and fix the post to pre-install semi-finished product c onto semi-finished product b. After assembly, the fixing post protrudes above the positioning hole (6). Install the corresponding number of semi-finished products c on semi-finished product b according to the design. D. The fixed column is heat-melted and deformed from top to bottom. The part of the fixed column (22) in the positioning hole (6) becomes larger and fits tightly with the positioning hole (6). At the same time, the rubber material deforms outward and presses the base plate (1) to fix the base plate (1) on the base (20) to obtain the semi-finished product d. E. Grinding: Grind the cutter body on the semi-finished product d simultaneously according to the design requirements, form a highly uniform grinding surface (3) on the upper end of different cutter bodies, and form a cutting edge (4) at the tip of the front end of the cutter body.

Images