Powder metallurgy special-shaped knife net of rotary shaver and cutting unit of powder metallurgy special-shaped knife net

Abstract

The utility model discloses a powder metallurgy special-shaped knife net of a rotary shaver, which comprises knife net side walls and a net top, a special-shaped knife net body is enclosed by the knife net side walls, the net top is provided with a pore inlet, the bottom of the knife net body is provided with a flanging towards the outer side, and the pore inlet, the net top and the knife net body are integrally formed by injection through a mold. The structure is simple, and the processing and the production are easy. The utility model further discloses a cutting unit, a special-shaped mounting hole corresponding to the knife net body is formed in the knife net support, the knife net is mounted in the mounting hole, and the upper portion of the knife net is exposed out of the upper portion of the knife net support. The special-shaped knife net body is beneficial to positioning in the machining process and rotation prevention matched with the knife net support.

Description

[Technical field]

[0001] The utility model relates to a powder metallurgy special-shaped blade net of a rotary shaver and also relates to a cutting unit. [Background technology]

[0002] The blade net of the existing rotary shaver is generally round in shape, which is convenient for stamping and forming, and also convenient for cutting holes around the circumference of the blade net by a grinding wheel on the top of the blade net. The shaving track is used for the rotating motion of the movable blade, and the shaving track is usually set next to the outer wall of the blade net body, and the shaving track is set concentrically with the blade net body. In the existing rotary shaver, since the cutting teeth of the movable blade match the shaving track, the movable blade is usually very close to the side wall of the blade net body, and the hair is cut inside the blade net. Since the movable blade usually has a chassis-shaped blade base, the blade base will seal the blade net from the bottom, and the cut hair is generally allowed to fall out through the gap between the outer side of the blade base and the side wall of the blade net. Since the movable blade is close to the side wall of the blade net body, the gap between the two is very limited. This results in that if the current rotary shaver is not cleaned frequently and in time, the shaved hair is easily accumulated in the blade net and is difficult to rinse through the faucet.

[0003] In addition, the circular knife net is not conducive to positioning during production and processing, as well as anti-rotation positioning during use.

[0004] The utility model is made based on this situation. [Contents of the utility model]

[0005] The technical problem to be solved by the utility model is to provide a powder metallurgy special-shaped blade net of a rotary shaver which has a simple structure and is easy to process and produce.

[0006] In order to solve the above technical problems, the utility model discloses a powder metallurgy special-shaped blade net of a rotary shaver, comprising blade net side walls and a net top, wherein the blade net side walls form a special-shaped blade net body, the net top is provided with a hair inlet hole, the bottom of the blade net body is provided with a flange facing outward, and the hair inlet hole, the net top and the blade net body are integrally injection molded through a mold.

[0007] As described above, the powder metallurgy shaped blade net of a rotary shaver has a shaped inner cavity surrounded by the inner side wall of the blade net, a center positioning column is provided at the bottom of the net top, a shaving track is provided in the inner cavity surrounding the center positioning column and used for the movable blade to rotate, and the hair inlet hole is arranged corresponding to the shaving track.

[0008] The powder metallurgy special-shaped blade net of a rotary shaver as described above, the net top includes a plurality of annular convex rings protruding upward, the bottom of the net top is provided with a central positioning column, the bottom of the convex ring is provided with a shaving track surrounding the central positioning column, and the hair inlet hole is arranged on the convex ring. Furthermore, the outer edge of the convex ring located at the outermost side is less than or equal to the inscribed circle of the net top, or its outer edge is consistent with the outer edge of the net top. Furthermore, the inner side of the side wall of the blade net is surrounded by a special-shaped inner cavity.

[0009] In the powder metallurgy special-shaped blade net of a rotary shaver as described above, the central positioning column is a solid structure.

[0010] In the powder metallurgy special-shaped blade mesh of a rotary shaver as described above, the side wall of the hair inlet hole is formed with a sharp-angled blade.

[0011] As described above, in the powder metallurgy shaped blade net of a rotary shaver, the outer sides of the blade net side walls are all straight walls, and multiple sections of the blade net side walls form a regular polygonal blade net body; or the outer sides of the blade net side walls are all arc-shaped walls, and multiple sections of the arc-shaped blade net side walls are identical and equiangled to form a flower-shaped blade net body.

[0012] Another technical problem to be solved by the utility model is to provide a cutting unit which has a simple structure, is easy to process and produce, and can prevent rotation and positioning during use.

[0013] In order to solve the above technical problems, the utility model provides a cutting unit of a powder metallurgy special-shaped blade net of a rotary shaver as described above, including a blade net bracket, on which a special-shaped mounting hole corresponding to the blade net body is provided, the blade net is mounted in the mounting hole, and the upper part of the blade net is exposed above the blade net bracket.

[0014] The utility model is realized by the following technical solutions:

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

[0016] 1. The special-shaped knife net body is conducive to the positioning of the processing process, and cooperates with the knife net bracket to prevent rotation. In addition, the knife net made by powder metallurgy process has a simple structure and is easy to process and produce special-shaped structures.

[0017] 2. The inner side of the side wall of the knife net forms a special-shaped inner cavity. When the movable knife rotates, the gap between the side wall of the inner cavity and the movable knife is small where the side wall of the inner cavity is close to the central positioning column, and becomes larger where the side wall of the inner cavity is far from the central positioning column. The large gap is conducive to discharging hair scraps, and the small gap is conducive to cutting hair at a position close to the outer side of the knife net body.

Brief Description of the Drawings

[0018] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0019] Figure 1a It is a structural schematic diagram of an embodiment of a rotary shaver of the utility model, in which the powder metallurgy special-shaped blade net is a polygonal structure;

[0020] Figure 1b It is a top view of an embodiment of a rotary shaver of the utility model, in which the powder metallurgy special-shaped blade net is a regular polygon structure;

[0021] Figure 1c yes Figure 1b The cross-sectional view along the AA direction;

[0022] Figure 1d yes Figure 1a A bottom view of an embodiment in which the inner cavity of the embodiment is circular;

[0023] Figure 1e yes Figure 1a A bottom view of an embodiment in which the inner cavity of the embodiment is a special shape;

[0024] Figure 2 It is a schematic structural diagram of an embodiment of the utility model in which a powder metallurgy special-shaped blade net of a rotary shaver is a polygonal structure and the outer edge of the outermost convex ring is smaller than the inscribed circle of the net top;

[0025] Figure 3a It is a structural schematic diagram of an embodiment of the utility model in which a powder metallurgy special-shaped blade net of a rotary shaver is a multi-segment arc combination structure;

[0026] Figure 3b It is a schematic structural diagram of an embodiment of a powder metallurgy special-shaped blade net of a rotary shaver of the utility model, wherein the blade net body is a flower-shaped blade net body surrounded by multiple arc segments;

[0027] Figure 4a It is a schematic structural diagram of an embodiment of the utility model in which a powder metallurgy special-shaped blade net of a rotary shaver is a multi-segment arc combination structure and the outer edge of the outermost convex ring is smaller than the inscribed circle of the net top;

[0028] Figure 4b yes Figure 4a A bottom view of an embodiment;

[0029] Figure 4c yes Figure 4b The cross-sectional view along the BB direction;

[0030] Figure 5 It is a structural schematic diagram of an embodiment of the utility model in which the mesh top of a powder metallurgy special-shaped mesh of a rotary shaver is not provided with a convex ring;

[0031] Figure 6a and Figure 6b It is a structural schematic diagram of another embodiment of a powder metallurgy special-shaped blade net of a rotary shaver of the utility model;

[0032] Figure 7 is a schematic diagram of an embodiment in which the inlet hole on the inner convex ring is a circular hole;

[0033] Figure 8 It is a schematic structural diagram of a cutting unit of a powder metallurgy special-shaped blade mesh equipped with a rotating shaver according to the utility model;

[0034] Fig. 9 It is a cross-sectional view of the knife mesh blank;

[0035] Fig.10 It is a schematic diagram of the knife mesh blank, in which part of the material is cut off from the bottom of the mesh top to form the fixed knife surface;

[0036] Fig.11 is a schematic cross-sectional view of an inlet pore and its sidewalls.

[0037] Fig.12 Schematic diagram of an embodiment in which the bottom of the groove in the knife mesh blank is closed;

[0038] Fig.13 It is a schematic diagram of an embodiment in which the groove in the knife net blank is a through hole that passes through from top to bottom and the bottom of the groove is not closed. [Specific implementation method]

[0039] The utility model is further described below in conjunction with the accompanying drawings:

[0040] like Figures 1a to 7 The powder metallurgy special-shaped blade net of a rotary shaver shown in the figure comprises a blade net side wall 10 and a net top 20. The blade net side wall 10 forms a special-shaped blade net body 1, and a hair inlet hole 4a is provided on the net top 20. The special-shaped of the utility model refers to other shapes besides a circle.

[0041] The special-shaped knife net body 1 is conducive to processing positioning, and Figure 8 The cutting unit shown includes a knife net bracket 201, and the knife net bracket 201 is provided with a special-shaped mounting hole 202 corresponding to the knife net body 1. The knife net can be effectively prevented from rotating relative to the knife net bracket 201 by being installed in the mounting hole 202, and the upper part of the knife net is exposed above the knife net bracket 201.

[0042] The bottom of the knife net body 1 is provided with a flange 11 facing outwards, and the flange 11 is clamped on the outside of the bottom of the mounting hole 202 to limit the knife net from escaping upwards from the mounting hole 202. Figures 1a to 4b As shown, the flange 11 can be a special-shaped structure corresponding to the blade net body 1, or it can be a special-shaped structure as shown in FIG. Figure 6bThe circular structure shown.

[0043] Preferably, if Figure 1e , 4b In the embodiment shown, the inner side of the knife net side wall 10 is surrounded by a special-shaped inner cavity 2, the bottom of the net top 20 is provided with a central positioning column 81, and the inner cavity 2 is provided with a shaving track 6 surrounding the central positioning column 81 and used for the movable knife teeth 12 of the movable knife to rotate. The hair inlet hole 4a is arranged corresponding to the shaving track 6. When the movable knife rotates, its motion trajectory is as follows: Figure 1e The dotted line C1 in the figure is a circle. When the movable knife is rotating, the gap between the side wall of the inner cavity 2 and the outer side of the movement trajectory of the movable knife is small where the side wall of the inner cavity 2 is close to the central positioning column 81, and becomes larger where the side wall of the inner cavity 2 is far from the central positioning column 81. The large gap is conducive to discharging hair scraps, and the small gap is conducive to cutting hair at a position close to the outer side of the knife net body 1.

[0044] Of course, you can also Figure 1d In the illustrated embodiment, the blade net side wall 10 has an uneven wall thickness and forms a circular inner cavity 2 on the inner side.

[0045] Preferably, if Figure 1a to Figure 2 In the embodiment shown, the outer side of the knife net side wall 10 is a straight wall, and multiple sections of the knife net side wall 10 form a polygonal knife net body 1. The knife net body 1 is preferably a regular polygon structure, such as an octagonal structure. Furthermore, there is a chamfer between two adjacent knife net side walls 10;

[0046] Or, if Figures 3a to 4b In the embodiment shown, the outer side of the knife net side wall 10 is an arc-shaped wall. Preferably, the knife net side walls 10 of multiple arcs are identical and equi-angled to form a flower-shaped knife net body 1. Furthermore, there is a chamfer between two adjacent knife net side walls 10;

[0047] Or, if Figure 6a and Figure 6b In the embodiment shown, the blade net body 1 may also be composed of a blade net side wall 10 that is partially a straight wall and a blade net side wall 10 that is partially an arc wall.

[0048] Preferably, if Figures 1a to 4c In the embodiment shown, the net top 20 includes a plurality of annular convex rings 3 protruding upward, a central positioning column 81 is provided at the bottom of the net top 20, a shaving track 6 surrounding the central positioning column 81 is provided at the bottom of the convex ring 3, and the hair inlet hole 4a is arranged on the convex ring 3. The convex ring structure facilitates hair to enter the blade net from the hair inlet hole 4a.

[0049] like Figure 1a to Figure 1c ,as well as Figure 3a , 3bIn the embodiment shown, the outer edge of the outermost convex ring 3 is consistent with the outer edge of the net top 20; or Figure 2 and Figures 4a to 4c In the illustrated embodiment, the outer edge of the outermost convex ring 3 is smaller than or equal to the inscribed circle of the mesh top 20. Preferably, the protruding height H1 of the convex ring 3 is ≤1.5 mm.

[0050] The number of the protruding rings 3 on the net top 20 may be one, two, three or more than three.

[0051] Of course, you can also Figure 5 In the illustrated embodiment, the mesh top of the knife net body 1 may not be provided with the convex ring 3, and the top surface of the mesh top 20 is a continuous curved surface or a flat surface.

[0052] The inlet holes 4a include a first inlet hole 4a1 having one end penetrating the annular outer side 32 of the convex ring 3 in the transverse direction, a second inlet hole 4a2 closed on all sides, and / or a third inlet hole 4a3 having one end penetrating the annular inner side 33 of the convex ring 3 in the transverse direction and the other end being a terminal end.

[0053] like Figure 1b and Figure 3b As shown, the inlet hole 4a includes a first inlet hole 4a1 having one end penetrating the annular outer side of the convex ring 3 in the transverse direction and the other end being a terminal end, and a third inlet hole 4a3 having one end penetrating the annular inner side of the convex ring 3 in the transverse direction and the other end being a terminal end.

[0054] like Figure 2 and Figure 4a As shown, the hair inlet hole 4a includes a first hair inlet hole 4a1 having one end penetrating the annular outer side of the protruding ring 3 and the other end penetrating the annular inner side of the protruding ring 3 in the transverse direction, and a second hair inlet hole 4a2 which is closed on all sides.

[0055] like Figure 7 As shown, the inlet hole 4a includes a first inlet hole 4a1 having one end extending through the annular outer side of the convex ring 3 in the transverse direction and the other end being a terminal end, a third inlet hole 4a3 having one end extending through the annular inner side of the convex ring 3 in the transverse direction and the other end being a terminal end, and a second inlet hole 4a2 closed on all sides.

[0056] The side wall of the inlet hole 4a is formed with an acute-angled blade 4b to improve the sharpness of cutting.

[0057] The special-shaped knife net of the utility model is formed by powder metallurgy, and the inlet holes 4a, the net top 20 and the knife net body 1 are integrally injection-molded through a mold, which has a simple structure and is conducive to mass production and improved production efficiency.

[0058] The following is an embodiment of a powder metallurgy forming process of a special-shaped knife net, comprising the following steps:

[0059] A. The raw material with stainless steel powder is injected into the mold by an injection molding machine to obtain a knife mesh blank, such as Fig. 9 As shown, the knife net blank comprises a knife net body 1, the knife net body 1 has an inner cavity 2 with an opening facing downward, a plurality of downwardly concave grooves 4 are integrally formed on the mesh top of the knife net body 1, the groove 4 has a groove wall 40 inclined upward and outward, and a chamfer R is formed between the groove wall 40 and the top surface 31 of the mesh top of the knife net body 1;

[0060] B. Put the knife mesh blank into the degreasing furnace for degreasing;

[0061] C. Put the degreased knife mesh blank into the sintering furnace for sintering;

[0062] D. heat-treating and hardening the sintered blade mesh blank. Preferably, the heat-treating and hardening process makes the hardness of the blade mesh blank reach 40HRC or above;

[0063] E. A portion of the material is cut off from the bottom of the top of the knife net body 1 to form a fixed knife surface 5, and at the same time, a hair inlet hole 4a communicating with each other is formed at the groove 4, and a blade 4b with an acute angle is formed on the side wall of the hair inlet hole 4a, and a shaving track 6 for rotating the movable knife teeth is formed below the fixed knife surface 5, as shown in FIG. Fig.10 and Fig.11 shown.

[0064] In one embodiment, a raw material having stainless steel powder is prepared by mixing stainless steel powder and POM powder evenly and then manufacturing the mixed raw material into granules through a granulator, wherein the mass proportion of POM powder is 5% to 15%; the stainless steel powder can be selected from 440C stainless steel powder or 316 stainless steel powder or 420 stainless steel powder, the mass proportion of POM powder is 8%±2%, and the particle size of the stainless steel powder and the POM powder is less than 20μm, such as 3μm to 8μm.

[0065] Preferably, after the knife mesh blank is sintered, it can be shaped by a shaping mold and then heat treated so that the obtained knife mesh blank is closer to the design requirements. The shaped part can be only the positioning structure on the knife mesh blank used for cooperating with the outside for positioning, or the entire knife mesh blank can be shaped. When the entire knife mesh blank needs to be shaped, the shaping mold is designed according to the designed contour of the knife mesh blank.

[0066] Preferably, the outer diameter of the granules produced by the granulator is less than 5 mm; the degreasing temperature in step B is 100°C to 150°C, and oxalic acid is introduced into the degreasing furnace to vaporize the POM material in the knife mesh blank at high temperature and remove it, and the degreasing time is 6h to 10h.

[0067] Preferably, the sintering time in step C is 20h to 30h, wherein the maximum sintering temperature t is set between 1200°C and 1400°C, and preferably, the temperature is kept for 2-5h after the temperature is raised to the set maximum temperature t. In one embodiment, from the beginning to the end, the temperature ranges and times of the sintering are: sintering from room temperature to 900°C for 3-8h, sintering from 900°C to 1200°C for 2-6h, sintering from 1200°C to 1400°C for 2-5h, sintering from 1200°C to 1000°C for 0.5-5h, and sintering from 1000°C to room temperature for 8-15h. Of course, the sintering temperature range and sintering time can also be other set values.

[0068] Preferably, the heat treatment in step D is first quenching to make the hardness of the knife net blank reach 52HRC±3HRC, and then tempering to 45HRC±3HRC, which is conducive to processing and forming the knife net and making the structure of the obtained knife net stable.

[0069] Preferably, in the above step A, Fig.12 As shown, the bottom of the groove 4 is closed. In step C, the knife mesh blank obtained after sintering has a material thickness T1 of the closed part of the bottom of the groove 4 ≥ 0.2 mm, which is conducive to injection molding of the groove 4. The depth T2 of the groove 4 is ≥ 0.2 mm, which is conducive to processing the pores 4a while ensuring the thickness between the fixed knife surface 5 and the top surface of the mesh top. Fig.11 As shown by the dotted line L1, material is cut from the bottom of the mesh top of the knife mesh body 1 to the position L1, and the position L1 is located above the bottom of the groove 4, so that the groove is connected from top to bottom to form the pores.

[0070] Of course, you can also Fig.13 As shown, the groove 4 can also pass through the top of the net from top to bottom, and the bottom is not closed.

Claims

1. A powder metallurgy special-shaped blade net for a rotary shaver, characterized in that: The invention comprises a knife net side wall (10) and a net top (20), wherein the knife net side wall (10) surrounds a special-shaped knife net body (1), the net top (20) is provided with a hair inlet hole (4a), the bottom of the knife net body (1) is provided with a flange (11) facing outwards, and the hair inlet hole (4a), the net top (20) and the knife net body (1) are integrally injection-molded by a mold.

2. The powder metallurgy shaped blade net of a rotary shaver according to claim 1, characterized in that: The inner side of the blade net side wall (10) forms a special-shaped inner cavity (2); a central positioning column (81) is provided at the bottom of the net top (20); a shaving track (6) surrounding the central positioning column (81) and used for rotating the movable blade is provided in the inner cavity (2); and the hair inlet hole (4a) is provided corresponding to the shaving track (6).

3. The powder metallurgy shaped blade net of a rotary shaver according to claim 1, characterized in that: The net top (20) comprises a plurality of annular convex rings (3) protruding upwards, a central positioning column (81) is provided at the bottom of the net top (20), a shaving track (6) surrounding the central positioning column (81) is provided at the bottom of the convex ring (3), and the hair inlet hole (4a) is arranged on the convex ring (3).

4. The powder metallurgy special-shaped blade net of a rotary shaver according to claim 3, characterized in that: The outer edge of the convex ring (3) located at the outermost side is smaller than or equal to the inscribed circle of the net top (20), or the outer edge is consistent with the outer edge of the net top (20).

5. The powder metallurgy shaped blade net of a rotary shaver according to claim 3, characterized in that: The inner side of the blade net side wall (10) forms a special-shaped inner cavity (2).

6. The powder metallurgy shaped blade net of a rotary shaver according to claim 2 or 3, characterized in that: The central positioning column (81) is a solid structure.

7. A powder metallurgy shaped blade net for a rotary shaver according to any one of claims 1 to 5, characterized in that: The side wall of the inlet hole (4a) is formed with an acute-angled blade (4b).

8. A powder metallurgy special-shaped blade net for a rotary shaver according to any one of claims 1 to 5, characterized in that: The outer sides of the knife net side walls (10) are all straight walls, and a plurality of sections of the knife net side walls (10) form a regular polygonal knife net body (1).

9. A powder metallurgy special-shaped blade net for a rotary shaver according to any one of claims 1 to 5, characterized in that: The outer sides of the knife net side walls (10) are all arc-shaped walls, and the knife net side walls (10) of multiple arcs are identical and equi-angled to form a flower-shaped knife net body (1).

10. A cutting unit comprising the powder metallurgy profiled blade mesh of a rotary shaver according to any one of claims 1 to 9, characterized in that: It comprises a knife net support (201), the knife net support (201) is provided with a special-shaped installation hole (202) corresponding to the knife net body (1), the knife net is installed in the installation hole (202), and the upper part of the knife net is exposed above the knife net support (201).

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