Powder metallurgy knife net with connected skin contact surfaces on inner ring and outer ring

Abstract

The utility model discloses a powder metallurgy knife net with connected skin contact surfaces on an inner ring and an outer ring, which comprises a rigid knife net body, more than two annular shaving tracks are arranged at the bottom of the net top of the knife net body, a reinforcing ring is arranged between every two adjacent shaving tracks, and the skin contact surfaces are arranged on the inner ring and the outer ring of the knife net body. A connected skin contact face is arranged on the net top and located between every two adjacent shaving tracks, the net top is provided with hair inlet holes communicated with the shaving tracks downwards, and the structural strength between every two adjacent shaving tracks inside and outside is improved through a reinforcing ring at the bottom of the net top. The skin contact surface corresponding to the net top is internally and externally connected, so that the integrity is good, and the skin feeling during shaving can be improved.

Description

Technical Field

[0001] The utility model relates to the field of rotary shavers, and more specifically to a powder metallurgy cutter net with skin contact surfaces where the inner and outer rings are connected.

Background Art

[0002] Existing rotary shaver cutter nets, such as Figure 12 shown, are usually formed by stamping and are rigid. To ensure shaving cleanly, the material at the top of the net is thinned, and during the process of thinning the bottom of the top of the net, a fixed cutter surface with good structural stability and consistency in cooperation with the moving cutter teeth is formed on the shaving track, thereby ensuring the stability and sharpness of cutting and avoiding pulling hair and causing a stinging sensation to the skin. However, the width of a single thinned area at the top of the net cannot be too wide to ensure structural strength. In order to increase the shaving area, the cutter net usually has a double-ring or multi-ring cutting structure, that is, by punching spacer grooves downward from the top of the net, different convex rings are spaced out on the top of the net through the spacer grooves, and the bottoms of different convex rings are thinned to form different shaving tracks for cutting. The material at the top of the net forms a reinforcing structure when the spacer grooves are punched. For the top of the net with different inner and outer convex rings, their skin contact surfaces are respectively located on the top surfaces of different convex rings, and the skin contact surfaces are significantly divided into independent inner and outer regions, affecting the shaving feel.

[0003] There is also another type which is a flexible mesh cover made of very thin stainless steel sheets. Its outer shape is formed by stamping, and the mesh holes on it are generally manufactured by stamping or etching. This mesh cover is prone to elastic deformation under pressure, resulting in poor cooperation with the moving cutter. Moreover, due to the very thin and non-rigid flexible mesh cover, its bottom is usually directly used as the fixed cutter surface to rotate and cooperate with the moving cutter for cutting after stamping. The consistency of the bottom of the flexible mesh cover is determined by the stamping process, and its flatness is determined by the stainless steel sheet itself. Therefore, there are differences in the flatness and consistency of different positions at the bottom of the flexible mesh cover, and it is easy to have poor fitting when cooperating with the moving cutter, resulting in a decrease in sharpness and easy occurrence of pulling hair, causing pain to the skin.

[0004] The present utility model is made based on this situation.

Content of the Utility Model

[0005] The technical problem to be solved by the present utility model is to provide a powder metallurgy cutter net with skin contact surfaces where the inner and outer rings are connected, which has a simple structure and a good shaving feel.

[0006] The present utility model is realized through the following technical solutions:

[0007] A powder metallurgy cutter net with skin contact surfaces where the inner and outer rings are connected, comprising a rigid cutter net body. At the bottom of the top of the cutter net body, there are more than two annular shaving tracks. Between adjacent two of the shaving tracks, there is a reinforcing ring. On the top of the net, between adjacent two shaving tracks, there are connected skin contact surfaces. On the top of the net, there are pore openings leading downward to communicate with the shaving tracks.

[0008] For a powder metallurgy cutter net with skin contact surfaces where the inner and outer rings are connected as described above, the top surfaces of the net corresponding to all the shaving tracks are located on the same spherical surface.

[0009] For a powder metallurgy cutter net with skin contact surfaces where the inner and outer rings are connected as described above, a logo part is integrally formed on the top of the net.

[0010] For a powder metallurgy cutter net with skin contact surfaces where the inner and outer rings are connected as described above, the top surface of the logo part and the top surface of the net corresponding to the shaving tracks are connected to form a continuous skin contact surface.

[0011] For a powder metallurgy cutter net with skin contact surfaces where the inner and outer rings are connected as described above, the top surface of the logo part and the top surfaces of the net corresponding to all the shaving tracks are located on the same spherical surface.

[0012] For a powder metallurgy cutter net with skin contact surfaces where the inner and outer rings are connected as described above, the top surface of the logo part is spaced apart from the top surface of the net corresponding to the adjacent shaving tracks.

[0013] For a powder metallurgy cutter net with skin contact surfaces where the inner and outer rings are connected as described above, the top surfaces at the net corresponding to different shaving tracks are located on different curved surfaces.

[0014] For a powder metallurgy cutter net with skin contact surfaces where the inner and outer rings are connected as described above, several pore openings corresponding to different shaving tracks are connected and communicated together on the top of the net.

[0015] For a powder metallurgy cutter net with skin contact surfaces where the inner and outer rings are connected as described above, the cutter net body is circular, polygonal or flower-shaped.

[0016] For a powder metallurgy cutter net with skin contact surfaces where the inner and outer rings are connected as described above, a concave logo installation groove is provided in the middle of the top of the net.

[0017] For a powder metallurgy cutter net with skin contact surfaces where the inner and outer rings are connected as described above, the pore openings, the reinforcing ring, the top of the net and the cutter net body are integrally formed by powder metallurgy.

[0018] Compared with the prior art, the present utility model has the following advantages:

[0019] 1. The rigid knife net structure of the present utility model is stable. In the shaving track, a fixed knife surface with good consistency in cooperation with the moving knife teeth can be formed through grinding. The structural strength is improved by the strengthening rings at the bottom of the net top between two adjacent shaving tracks inside and outside. Since the skin contact surfaces corresponding to the inside and outside shaving tracks are connected inside and outside, the integrity is good, and the skin feeling during shaving can be improved.

[0020] 2. A logo part is integrally formed on the net top of the present utility model, eliminating the structure and production process of additionally installing a logo piece on the rigid knife net during the production of the razor, and the structure is simple.

[0021] 3. The top surfaces of the net tops corresponding to all the shaving tracks of the present utility model are located on the same spherical surface S, and the skin feeling is good.

Description of the Drawings

[0022] The following further details the specific implementation manners of the present utility model with reference to the drawings, where:

[0023] Figure 1 is the top view of an embodiment of a powder metallurgy knife net with the skin contact surfaces of the inner and outer rings connected;

[0024] Figure 2 is Figure 1 the cross-sectional view along the A-A direction in

[0025] Figure 3 is the bottom view of an embodiment of a powder metallurgy knife net with the skin contact surfaces of the inner and outer rings connected;

[0026] Figure 4 is the structural schematic diagram of an embodiment where the top surface of the net top corresponding to the double-ring shaving track is a spherical surface;

[0027] Figure 5 is the structural schematic diagram of an embodiment where the top surfaces of the net tops corresponding to the double-ring shaving track are located on different curved surfaces;

[0028] Figure 6 and Figure 7 are the structural schematic diagrams of an embodiment where the top surface of the logo part and the top surface of the net top corresponding to the shaving track are located on the same spherical surface;

[0029] Figure 8 are the structural schematic diagrams of an embodiment where the top surface of the logo part and the top surface of the net top corresponding to the adjacent shaving track are spaced apart;

[0030] Figure 9 is the top view of another embodiment of a powder metallurgy knife net with the skin contact surfaces of the inner and outer rings connected;

[0031] Figure 10It is a schematic structural diagram of an embodiment where the cutter net body is polygonal;

[0032] Figure 11 It is a schematic structural diagram of an embodiment where the cutter net body is flower-shaped;

[0033] Figure 12 It is a cross-sectional view of the cutter net in the existing stamping technology.

Specific Embodiments

[0034] The following further describes the present utility model in conjunction with the accompanying drawings:

[0035] As Figures 1 to 9 shown, a powder metallurgy cutter net with skin contact surfaces where the inner and outer rings are connected includes a rigid cutter net body 1. At the bottom of the net top 20 of the cutter net body 1, there are two or more annular shaving tracks 6. Between adjacent two of the shaving tracks 6, there is a reinforcing ring 15. On the net top 20, between adjacent two of the shaving tracks 6, there are connected skin contact surfaces 16. On the net top 20, there are pore openings 4a that communicate downward with the shaving tracks 6. The structural strength is improved between the inner and outer adjacent shaving tracks 6 through the reinforcing ring 15 at the bottom of the net top. Since between the inner and outer shaving tracks 6, the corresponding skin contact surfaces of the net top are connected inside and outside, the integrity is good, and the skin feeling during shaving can be improved.

[0036] The pore openings 4a corresponding to different shaving tracks 6 can be independent, as Figure 1 shown; or as Figure 9 shown, several pore openings 4a corresponding to different shaving tracks 6 can also be connected together on the net top. For example, several pore openings 4a on the inner and outer shaving tracks 6 are connected into a straight line, or two pore openings 4a on one shaving track 6 are connected with one pore opening on another shaving track to form a Y shape. The pore openings 4a on different shaving tracks 6 are connected into a connecting groove so that the hair can move between the inner and outer shaving tracks 6 along the connecting groove, enabling the hair missed in one shaving track to better enter another shaving track for cutting.

[0037] Preferably, as Figure 4 、 6 、7 shown in the embodiments, the top surfaces of the net top 20 corresponding to all the shaving tracks 6 are located on the same spherical surface S, with a good skin feeling. Of course, it can also be as Figure 5 shown in the embodiment, where the top surfaces at the net top 20 corresponding to different shaving tracks 6 are located on different curved surfaces.

[0038] As Figure 4 and Figure 5 shown in the embodiments, a concave logo installation groove 17 is provided in the middle of the net top 20 for installing an external logo piece.

[0039] Preferably, as Figures 6 - 8 shown in the embodiment, a logo portion 13 is integrally formed on the top net 20, eliminating the structure and production process of additionally installing a logo piece on the rigid cutter net during razor production, and the structure is simple.

[0040] Preferably, as Figure 6 and 7 shown in the embodiment, the top surface of the logo portion 13 and the top surface of the top net 20 corresponding to the shaving track 6 are connected to form a continuous skin contact surface, providing a good skin feel. Further, the top surface of the logo portion 13 and the top surface of the top net 20 corresponding to all shaving tracks 6 are located on the same spherical surface S.

[0041] Of course, as Figure 8 shown, the top surface of the logo portion 13 and the top surface of the top net 20 corresponding to the adjacent shaving track 6 may also be spaced apart.

[0042] The cutter net body 1 is circular; as Figure 10 shown in the embodiment, the cutter net body 1 may also be polygonal; as Figure 11 shown in the embodiment, the cutter net body 1 may also be flower-shaped.

[0043] The above-mentioned rigid cutter net is manufactured by powder metallurgy, and the inlet pores 4a, the reinforcing ring 15, the top net 20 and the cutter net body 1 are integrally formed by powder metallurgy.

[0044] The following is an embodiment of the powder metallurgy forming process, including the following steps:

[0045] A. Inject a 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 downward, and a plurality of downwardly concave grooves are integrally formed on the top net of the cutter net body 1;

[0046] B. Place the cutter net blank in a degreasing furnace for degreasing;

[0047] C. Place the degreased cutter net blank in a sintering furnace for sintering;

[0048] 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;

[0049] E. Part of the material is shaved off from the bottom of the net top 20 of the cutter net body 1 to form two or more fixed cutter surfaces 5. Shaving tracks 6 for the rotary movement of the moving cutter teeth are respectively formed below the fixed cutter surfaces 5. Pore openings 4a communicating downward with the shaving tracks 6 are formed at the grooves. A reinforcing ring 15 is provided between two adjacent shaving tracks 6 to separate the two shaving tracks 6. The reinforcing ring 15 protrudes downward below the fixed cutter surface 5. The material thickness of the reinforcing ring 15 is greater than the material thickness of the net top corresponding to the shaving track 6. Preferably, the material thickness of the reinforcing ring 15 is greater than 0.4 mm.

[0050] In one embodiment, the raw material has stainless steel powder. The stainless steel powder and POM powder are mixed evenly and made into granular raw materials by a granulator, wherein the mass ratio of the 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.

[0051] In step B, the degreasing temperature is 100°C - 150°C. Oxalic acid is introduced into the degreasing furnace to vaporize and remove the POM material in the cutter net blank at high temperature. The degreasing time is 6h - 10h.

Claims

1. A powder metallurgy cutter mesh with skin contact surfaces where the inner and outer rings are connected, characterized in that: It includes a rigid cutter net body (1). At the bottom of the net top (20) of the cutter net body (1), there are two or more annular shaving tracks (6). Between two adjacent shaving tracks (6), there is a reinforcing ring (15). On the net top (20), between two adjacent shaving tracks (6), there is a connected skin contact surface (16). On the net top (20), there are pore openings (4a) that communicate downward with the shaving tracks (6).

2. The powder metallurgy knife net according to claim 1, wherein the inner and outer rings have connected skin contact surfaces, characterized in that: The top surfaces of the net top (20) corresponding to all the shaving tracks (6) are located on the same spherical surface (S).

3. A powder metallurgy knife net having a skin contact surface where the inner and outer rings are connected as claimed in claim 1, characterized in that: On the net top (20), there is an integrally formed logo part (13).

4. The powder metallurgy knife net with skin contact surfaces of the inner and outer rings being connected according to claim 3, characterized in that: The top surface of the logo part (13) and the top surface of the net top (20) corresponding to the shaving track (6) are connected to form a continuous skin contact surface.

5. A powder metallurgy knife net with skin contact surfaces where the inner and outer rings are connected, characterized in that: The top surface of the logo part (13) and the top surfaces of the net top (20) corresponding to all the shaving tracks (6) are located on the same spherical surface (S).

6. The powder metallurgy knife net according to claim 3, wherein the inner and outer rings have connected skin contact surfaces, and is characterized in that: The top surface of the logo part (13) and the top surface of the net top (20) corresponding to the adjacent shaving track (6) are spaced apart.

7. A powder metallurgy knife net with skin contact surfaces where the inner and outer rings are connected, characterized in that: A number of pore openings (4a) corresponding to different shaving tracks (6) are connected and communicated with each other on the net top.

8. A powder metallurgy knife net with skin contact surfaces where the inner and outer rings are connected, characterized in that: The cutter net body (1) is circular, polygonal or flower-shaped.

9. A powder metallurgy knife net with skin contact surfaces where the inner and outer rings are connected, as described in any one of claims 1, 2, 7, or 8, characterized in that: In the middle of the net top (20), there is a concave logo installation groove (17).

10. A powder metallurgy knife net with a skin contact surface where the inner and outer rings are connected according to any one of claims 1 to 8, characterized in that: The pore openings (4a), the reinforcing ring (15), the net top (20) and the cutter net body (1) are integrally formed by powder metallurgy.

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