Powder metallurgy rigid razor net of rotary razor

Abstract

The utility model discloses a powder metallurgy rigid knife net of a rotary shaver, which comprises a rigid knife net body and a hair inlet structure, the hair inlet structure comprises a hair inlet groove and a hair inlet hole which vertically penetrate through the net top of the knife net body, the hair inlet groove is further provided with a lateral opening, more than two shaving tracks are arranged on the knife net body, and the shaving tracks are arranged on the knife net body. A shaving track on the outermost side is provided with a hair inlet groove, a shaving track on the inner side is provided with a hair inlet hole, the hair inlet hole is a long hole with the periphery closed, the length direction of the hair inlet hole faces or basically faces the center of the knife net body, and the ratio of the width b to the length a of the hair inlet hole ranges from 0.4 to 0.8. The width of the middle of each hair inlet hole in the length direction is large, the width of the two ends of each hair inlet hole in the length direction is small, the hair inlet holes in each row are arranged in the circumferential direction, every two adjacent rows of hair inlet holes are arranged in a staggered mode, and the hair feeding and cutting device has the advantages of being simple in structure and good in hair feeding and cutting efficiency.

Description

Technical Field

[0001] The utility model relates to a powder metallurgy rigid cutter net of a rotary shaver.

Background Art

[0002] At present, there are mainly two types of rotary shavers on the market. One is a shaver with a flexible mesh cover, and the other is a shaver with a rigid cutter net. The flexible mesh cover is usually made of very thin metal sheets. This mesh cover is prone to elastic deformation under pressure and is likely to have poor cooperation with the moving cutter. Due to lack of strength, generally only stamping or etching can be used to manufacture the mesh holes on it, and it is impossible to generate a hair inlet groove with a side opening. The rigid cutter net is formed by stamping relatively thick metal plates, such as steel with a thickness of more than 0.4 mm. During manufacturing, generally after stamping and forming, due to its structural strength and stable shape, a hair inlet groove can be further processed on it by a grinding wheel. The hair inlet groove usually has an opening on the side, which is conducive to guiding the hair in, and is more conducive to cutting medium and long beards. Moreover, the performance and structure are stable. Therefore, among the rotary shavers on the market, the rotary shaver with a rigid cutter net is more favored and more widely used; the rigid cutter net usually has two or more shaving tracks inside and outside. After setting the hair inlet groove on the outer shaving track, in order to further improve the performance, such as improving the skin feel, circular hair inlet holes will be stamped on the inner shaving track. For example, in the cutter net structure disclosed in the patent with the publication number CN101396833A, the material thickness of the mesh top corresponding to the inner shaving track can be made thinner to improve the shaving cleanliness. Since when punching the holes, the holes within a certain small angle range are punched out first, and then rotated to another angle to punch other holes, generally circular holes are punched, and the circular hair inlet holes are generally regular holes of the same size, and the interval between the holes is relatively large to prevent stamping deformation. And in order to achieve a clean shave, the material thickness around the holes is usually very thin. And for safety, the size of the holes will also be restricted to prevent the skin from being squeezed in. This results in low shaving efficiency of the circular hair inlet holes.

[0003] The present utility model is made based on this situation.

Content of the Utility Model

[0004] The technical problem to be solved by the present utility model is to provide a powder metallurgy rigid cutter net of a rotary shaver, which has the characteristics of simple structure, good hair inlet and cutting efficiency.

[0005] The present utility model is realized through the following technical solutions:

[0006] A powder metallurgy rigid cutter net for a rotary shaver, comprising a rigid cutter net body and a hair inlet structure. The hair inlet structure includes a hair inlet groove and a hair inlet hole that penetrate through the top of the cutter net body up and down. The hair inlet groove also has a lateral opening. Two or more shaving tracks are provided on the cutter net body. The hair inlet groove is arranged on the outermost shaving track, and the hair inlet hole is arranged on one of the inner shaving tracks. The hair inlet hole is a long hole with a closed perimeter, and its length direction is towards or substantially towards the center of the cutter net body. The ratio of its width b to its length a is between 0.4 and 0.8. The width of the middle part of the hair inlet hole in the length direction is large, and the widths of both ends are small. There are two or more rows of inner and outer hair inlet holes, and each row of hair inlet holes is arranged in a circumferential direction. The adjacent two rows of hair inlet holes are arranged staggeredly.

[0007] For the powder metallurgy rigid cutter net of a rotary shaver as described above, the hair inlet groove, the hair inlet hole and the cutter net body are integrally injection molded by powder metallurgy.

[0008] For the powder metallurgy rigid cutter net of a rotary shaver as described above, the hair inlet hole is an oval hole, a runway-shaped hole, an olive-shaped hole, a flat long hexagonal hole or a flat long octagonal hole.

[0009] For the powder metallurgy rigid cutter net of a rotary shaver as described above, between the adjacent two rows of hair inlet holes, two hair inlet holes on one row and one hair inlet hole on the other row are arranged in a staggered pattern.

[0010] For the powder metallurgy rigid cutter net of a rotary shaver as described above, the width b at the maximum position of the hair inlet hole satisfies 0.3mm ≤ b ≤ 0.5mm.

[0011] For the powder metallurgy rigid cutter net of a rotary shaver as described above, taking the lower edge of the hair inlet hole as the measurement reference, the distance d between the hair inlet hole and the nearest other hair inlet hole satisfies 0.2mm ≤ d ≤ 0.3mm.

[0012] For the powder metallurgy rigid cutter net of a rotary shaver as described above, the upper ports of the hair inlet hole and the hair inlet groove are provided with rounded corners.

[0013] For the powder metallurgy rigid cutter net of a rotary shaver as described above, the lower edges of the hair inlet hole and the hair inlet groove are provided with acute cutting edges.

[0014] For the powder metallurgy rigid cutter net of a rotary shaver as described above, the middle part of the hair inlet groove on the outermost shaving track bends in the same direction.

[0015] Compared with the prior art, the present utility model has the following advantages:

[0016] 1. The cutter net of the present utility model is provided with hair inlet grooves on the outermost shaving tracks, which is conducive to guiding hair into and cutting medium and long beards. Each of the inner shaving tracks is provided with hair inlet pores, which is conducive to making the shaving track thinner, improving the shaving cleanliness. Moreover, the skin contact surface corresponding to the inner shaving track has good integrity, which can improve the skin feeling. The cutter net is made of powder metallurgy. The pore shape of the hair inlet pores can be easily made into long-shaped pores, such as olive-shaped pores, flat long hexagonal pores, flat long octagonal pores, runway-shaped pores and oval pores, and the length direction is towards or basically towards the center of the cutter net body. In the direction of the rotational movement of the cutter teeth of the relative moving cutter, the hair inlet pores have longer cutting edges. Moreover, the hair inlet pores and the cutter net body are integrally injection molded by powder metallurgy, which is conducive to reducing the distance between the pores of the hair inlet pores, increasing the hair inlet area corresponding to the inner shaving track, and improving the cutting efficiency.

[0017] 2. Between two adjacent rows of the hair inlet pores of the present utility model, two hair inlet pores on one row and one hair inlet pore on the other row are distributed in a triangular pattern. Since the width of the middle part of the hair inlet pores in the length direction is large and the width of the two ends is small, the distance between two adjacent hair inlet pores in the same row is relatively large near the two ends. The three hair inlet pores distributed in a triangular pattern can effectively utilize the space, so that the material between the pores has a width that meets the structural strength while reducing the width occupied by two rows or more rows of hair inlet pores in the radial direction of the cutter net, so that the cutter teeth of the moving cutter can cover the hair inlet pores in the entire shaving track with a smaller width.

[0018] 3. The upper ports of the hair inlet grooves and the hair inlet pores of the present utility model are provided with rounded corners, which can improve the skin feeling and the hair inlet efficiency. And the lower edges of the hair inlet grooves and the hair inlet pores are provided with sharp cutting edges for sharp cutting.

[0019] 4. The middle part of the hair inlet groove on the outermost shaving track of the present utility model bends in the same direction. Since the moving cutter teeth on the moving cutter generally rotate in the middle area corresponding to the hair inlet groove, when the moving cutter teeth move in the direction of the bend of the middle part of the hair inlet groove, it is beneficial for the moving cutter teeth to avoid the lateral opening of the hair inlet groove and improve safety.

Description of the Drawings

[0020] The following further details the specific embodiments of the present utility model with reference to the drawings, where:

[0021] Figure 1 is a schematic structural diagram of an embodiment of a powder metallurgy rigid cutter net of a rotary shaver of the present utility model with olive-shaped hair inlet pores;

[0022] Figure 2 is a schematic structural diagram of an embodiment of a powder metallurgy rigid cutter net of a rotary shaver of the present utility model with flat long hexagonal hair inlet pores;

[0023] Figure 3It is a schematic structural view of an embodiment of a powder metallurgy rigid cutter net of a rotary shaver of the present utility model, which has flat and long octagonal hair inlet pores;

[0024] Figure 4 It is a schematic structural view of an embodiment of a powder metallurgy rigid cutter net of a rotary shaver of the present utility model, which has oval hair inlet pores;

[0025] Figure 5 It is a schematic structural view of an embodiment of a powder metallurgy rigid cutter net of a rotary shaver of the present utility model, which has oval hair inlet pores;

[0026] Figure 6 It is a sectional view of a powder metallurgy rigid cutter net of a rotary shaver of the present utility model along Figure 5 the A-A direction in the middle;

[0027] Figure 7 It is a schematic structural view of the hair inlet pores;

[0028] Figure 8 It is a schematic cross-sectional view of the hair inlet groove or the hair inlet pores;

[0029] Figure 9 It is a schematic view of an embodiment in which the cutter net body is polygonal;

[0030] Figure 10 It is a schematic view of an embodiment in which the cutter net body is plum blossom-shaped.

Detailed implementation manners

[0031] The present utility model will be further described below in conjunction with the accompanying drawings:

[0032] As Figures 1 to 8 shown, a powder metallurgy rigid cutter net of a rotary shaver includes a rigid cutter net body 1 and a hair inlet structure. The hair inlet structure includes a hair inlet groove 3 and hair inlet pores 4 that penetrate through the top 20 of the cutter net body 1 up and down. The hair inlet groove 3 also has a lateral opening 31. Two or more shaving tracks 6 are provided on the cutter net body 1. The hair inlet groove 3 is arranged on the outermost shaving track 6, and the hair inlet pores 4 are arranged on each of the inner shaving tracks 6. The hair inlet pores 4 are long holes closed on all sides, and the length direction thereof faces or basically faces the center of the cutter net body 1. The ratio of the width b to the length a thereof is between 0.4 and 0.8. The width of the middle part of the hair inlet pores 4 in the length direction is large, and the width of both ends is small, which is beneficial to increasing the area of the hair inlet pores while preventing the skin from being squeezed in and cut. There are two or more rows of inner and outer hair inlet pores 4, and each row of hair inlet pores 4 is arranged around the circumferential direction. The adjacent two rows of hair inlet pores 4 are arranged staggeredly, which is beneficial to making the width of the material between the pores meet the structural strength while improving the utilization of space and increasing the area of the hair inlet pores 4.

[0033] The hair inlet groove 3 and the hair inlet holes 4 are integrally injection molded with the cutter net body 1 by powder metallurgy, with a simple structure, which simplifies the production process of the hair inlet groove 3 and the hair inlet holes 4, facilitates reducing the distance between the holes of the hair inlet holes 4 and the distance between the grooves of the hair inlet groove 3, and increases the hair inlet area of the hair inlet structure.

[0034] As Figure 9 and Figure 10 shown, for the rigid cutter net formed by powder metallurgy, in addition to being circular, the cutter net body 1 can also be polygonal, plum blossom shaped or other shapes.

[0035] The hair inlet groove 3 is arranged on the outermost shaving track 6 of the cutter net, which is conducive to guiding and cutting medium and long beards. The inner shaving tracks 6 are all provided with hair inlet holes 4, which is conducive to making the shaving track 6 thinner and improving the shaving cleanliness. The combination of the two enables the cutter net to have better shaving efficiency and shaving cleanliness. Since the cutter net is made of powder metallurgy, the hole shape of the hair inlet holes 4 can be conveniently made into long holes, such as Figures 1 to 5 the olive-shaped holes, flat long hexagonal holes, flat long octagonal holes, runway-shaped holes and oval holes shown, and the length direction faces or basically faces the center of the cutter net body 1. In the direction of the rotational movement of the cutter teeth of the relative moving cutter, the hair inlet holes 4 have longer cutting edges, improving the cutting efficiency.

[0036] Preferably, between two adjacent rows of the hair inlet holes 4, two hair inlet holes 4 on one row and one hair inlet hole 4 on the other row are distributed in a staggered pattern. Since the width of the middle part of the hair inlet holes 4 is large and the width of the two ends is small in the length direction, the distance between two adjacent hair inlet holes 4 in the same row is relatively large near the two ends. The three hair inlet holes 4 distributed in a staggered pattern can effectively utilize the space, enabling the material between the holes to have a width that meets the structural strength while reducing the width occupied by two or more rows of hair inlet holes in the radial direction of the cutter net, so that the cutter teeth of the moving cutter can cover the hair inlet holes 4 in the entire shaving track 6 with a smaller width.

[0037] Preferably, taking the lower edge of the hair inlet holes 4 as the measurement reference, the distance d between the hair inlet holes 4 and the nearest other hair inlet hole 4 satisfies 0.2mm ≤ d ≤ 0.3mm, thereby increasing the proportion of the hair inlet area.

[0038] Preferably, the width b at the maximum position of the hair inlet holes 4 satisfies 0.3mm ≤ b ≤ 0.5mm, which is conducive to hair inlet, and the length a satisfies 0.4mm ≤ a ≤ 0.75mm. There is no direct or inverse proportional relationship between a and b. Instead, a is adjusted based on safety performance on the basis of b. For example, when the width b is small, the length a of the hair inlet holes can be lengthened to improve hair inlet, and when the width b is large, the length a of the hair inlet holes can be reduced to prevent the skin from being squeezed into the hair inlet holes and cut.

[0039] Preferably, as shown in Figure 7 and Figure 8 , the upper ports of the hair inlet grooves 3 and the hair inlet pores 4 are provided with chamfered corners R to improve the skin feel and the hair inlet efficiency.

[0040] Preferably, as shown in Figure 7 and Figure 8 , the lower edges of the hair inlet grooves 3 and the hair inlet pores 4 are provided with sharp blades 4b with acute angles to improve the sharpness of cutting.

[0041] Preferably, as shown in the embodiment of Figure 1 , the middle part of the hair inlet groove on the outermost shaving track is bent in the same direction. Since the moving cutter teeth 5 on the moving cutter generally rotate and move corresponding to the middle area of the hair inlet groove, when the moving cutter teeth 5 move in the bending direction of the middle part of the hair inlet groove, it is beneficial for the moving cutter teeth to avoid the lateral openings of the hair inlet groove and improve safety.

[0042] For the above powder metallurgy cutter net, the following is an embodiment of the powder metallurgy forming process, including the following steps:

[0043] A. Inject the raw material with stainless steel powder through an injection molding machine to obtain a cutter net blank. The cutter net blank includes a cutter net body 1. The cutter net body 1 has an inner cavity 2 with an opening facing downwards. A plurality of downwardly concave hair inlet grooves 3 and hair inlet pores 4 are integrally formed on the top of the cutter net body 1. The hair inlet grooves 3 and the hair inlet pores 4 have groove walls that are inclined upwards and outwards. A chamfered corner R is formed between the groove walls and the top surface of the top of the cutter net body 1;

[0044] B. Place the cutter net blank in a degreasing furnace for degreasing;

[0045] C. Place the degreased cutter net blank in a sintering furnace for sintering;

[0046] D. Perform heat treatment hardening on the sintered cutter net blank. Preferably, the heat treatment hardening makes the hardness of the cutter net blank reach more than 40 HRC;

[0047] E. Cut off part of the material from the bottom of the top of the cutter net body 1 to form two or more shaving tracks 6 for the rotation and movement of the moving cutter teeth, so that the hair inlet grooves 3 and the hair inlet pores 4 penetrate from top to bottom to the corresponding shaving tracks 6.

[0048] In an embodiment, the raw material with stainless steel powder is made into granular raw material by mixing stainless steel powder and POM powder evenly through a granulator, where the mass ratio of POM powder is 5% - 15%; the stainless steel powder can be 440C stainless steel powder or 316 stainless steel powder or 420 stainless steel powder.

[0049] In step B, the degreasing temperature is 100°C to 150°C. Oxalic acid is introduced into the degreasing furnace to vaporize the POM material in the cutter net blank at high temperature and remove it. The degreasing time is 6h to 10h.

[0050] In the cutter net blank, the bottoms of the hair inlet grooves 3 and the hair inlet pores 4 can be closed. By shaving off the material from the bottom of the top of the cutter net body 1 in step E, the material closing the bottoms of the hair inlet grooves 3 and the hair inlet pores 4 is removed, so that the hair inlet grooves 3 and the hair inlet pores 4 communicate with the shaving track 6 for hair to enter the shaving track 6 for cutting.

Claims

1. A powder metallurgy diamond blade net for a rotary shaver, characterized in that: The invention comprises a rigid blade net body (1) and a hair feeding structure, wherein the hair feeding structure comprises a hair feeding groove (3) and a hair feeding hole (4) which penetrate the net top (20) of the blade net body (1) from top to bottom, wherein the hair feeding groove (3) also has a lateral opening (31), and the blade net body (1) is provided with more than two shaving tracks (6), wherein the hair feeding groove (3) is arranged on the outermost shaving track (6), and the hair feeding hole (4) is arranged on the inner shaving track (6), wherein the hair feeding hole (4) is a long hole which is closed on all sides, wherein the length direction of the hair feeding hole (4) is oriented toward or substantially oriented toward the center of the blade net body (1), and the ratio of the maximum width b to the length a is between 0.4 and 0.8, wherein the width of the hair feeding hole (4) in the middle is large and the width of the two ends is small in the length direction, wherein the hair feeding hole (4) has more than two rows, inner and outer, wherein the hair feeding holes (4) in each row are arranged in a circumferential direction, and the hair feeding holes (4) in two adjacent rows are staggered.

2. The powder metallurgy diamond blade net of a rotary shaver according to claim 1, characterized in that: The hair feeding groove (3), the hair feeding hole (4) and the knife net body (1) are integrally formed by powder metallurgy injection molding.

3. The powder metallurgy diamond blade net of a rotary shaver according to claim 1, characterized in that: The inlet holes (4) are oval holes, racetrack-shaped holes, olive-shaped holes, elongated hexagonal holes or elongated octagonal holes.

4. The powder metallurgy diamond blade mesh of a rotary shaver according to claim 1, characterized in that: Between two adjacent rows of the hair inlet holes (4), two hair inlet holes (4) in one row and one hair inlet hole (4) in the other row are distributed in a herringbone shape.

5. A powder metallurgy diamond blade mesh for a rotary shaver according to any one of claims 1 to 4, characterized in that: The width b of the inlet pore (4) at the maximum position satisfies 0.3 mm ≤ b ≤ 0.5 mm.

6. A powder metallurgy diamond blade mesh for a rotary shaver according to any one of claims 1 to 4, characterized in that: Taking the lower edge of the inlet hole (4) as a measurement reference, the spacing d between the inlet hole (4) and another closest inlet hole (4) satisfies 0.2 mm ≤ d ≤ 0.3 mm.

7. A powder metallurgy diamond blade mesh for a rotary shaver according to any one of claims 1 to 4, characterized in that: The upper ends of the wool inlet hole (4) and the wool inlet groove (3) are provided with rounded corners R.

8. The powder metallurgy diamond blade mesh of a rotary shaver according to claim 7, characterized in that: The lower edges of the hair inlet hole (4) and the hair inlet groove (3) are provided with sharp-angled blades (4b).

9. A powder metallurgy diamond blade mesh for a rotary shaver according to any one of claims 1 to 4, characterized in that: The middle parts of the hair feeding grooves (3) on the outermost shaving tracks (6) are bent in the same direction.

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