A cutting blade and a method of manufacturing the same, self-sharpening scissors

Abstract

The application provides a kind of scissors blade and its preparation method, self-sharpening scissors, relating to self-sharpening scissors, self-sharpening scissors includes scissors blade and coating, the inner side of the mutual contact of the scissors blade during shearing process is provided with coating, the coating is doped layer comprising any one of metal element and corresponding metal nitride, metal carbide or metal carbonitride, during the opening process of the scissors blade, the coating at the cutting edge of the mutual contact of the scissors blade moves towards, can make the cutting edge damaged during shearing process re-sharpening, with self-sharpening function, improve shearing force and shearing efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of self-sharpening scissors, in particular to a scissor blade, a preparation method thereof and self-sharpening scissors. BACKGROUND

[0002] Scissors are tools commonly used in people's production and life. Scissors are a kind of double-blade tool, the two blades of which intersect and can be opened and closed. Scissors can be used to cut linear objects such as cloth, paper, rope and round steel, and can also be used for cutting pterygium, blood sinew, skin and membrane in medical treatment.

[0003] In order to obtain relatively high hardness, the existing scissor blade base usually selects a stainless steel material for heat treatment to obtain a higher hardness value. After heat treatment, the blade is opened and treated. During the shearing process, the scissors move towards each other. With the extension of the use time, the blade edge is easy to blunt, which reduces the shearing force and shearing efficiency of the scissors, and the service life is short. SUMMARY

[0004] In order to overcome the deficiencies in the prior art, the present application provides a scissor blade, a preparation method thereof and self-sharpening scissors.

[0005] In a first aspect, the present application provides self-sharpening scissors, comprising: a scissor blade and a coating, the coating being provided on the inner side of the scissor blade which contacts each other during shearing, and the coating being a doped layer containing any one of a metal element and a corresponding metal nitride, metal carbide or metal carbonitride.

[0006] In combination with the first aspect, in a possible implementation, the weight percentage of the metal element in the coating is 50-95%.

[0007] In combination with the first aspect, in a possible implementation, the metal element is any one of chromium, titanium, molybdenum, vanadium and zirconium.

[0008] In combination with the first aspect, in a possible implementation, the self-sharpening scissors further comprise: a primer layer, the primer layer being provided between the base of the scissor blade and the coating, and the primer layer being a metal element layer.

[0009] In combination with the first aspect, in a possible implementation, the thickness of the coating is 0.5-10um, and the thickness of the primer layer is 0-0.5um.

[0010] In combination with the first aspect, in a possible implementation, the coating is also provided on the outer side of the scissor blade.

[0011] In a second aspect, the present application provides a preparation method of a scissor blade, comprising the following steps:

[0012] The coating layer is formed by depositing on the inner side of the scissors blade, and comprises a doped layer of a metal element and any one of a corresponding metal nitride, metal carbide or metal carbonitride.

[0013] In combination with the second aspect, in a possible implementation, the method further comprises a step of cleaning the scissors blade before the coating layer is formed by depositing on the inner side of the scissors blade.

[0014] In combination with the second aspect, in a possible implementation, the cleaning of the scissors blade comprises plasma etching cleaning and ultrasonic cleaning.

[0015] In combination with the second aspect, in a possible implementation, the method further comprises a step of cleaning the scissors blade before the coating layer is formed by depositing on the inner side of the scissors blade.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] The self-sharpening scissors provided by the present application are provided with a coating layer on the inner side of the scissors blades that contact each other during shearing, the coating layer is a doped layer comprising a metal element and any one of a corresponding metal nitride, metal carbide or metal carbonitride, during opening of the scissors blades, the coating layers at the cutting edges of the scissors blades that contact each other move towards each other, so that the damaged cutting edges during shearing are re-sharpened, the self-sharpening function is achieved, and the shearing force and shearing efficiency are improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0019] Figure 1 A front view of the self-sharpening scissors is shown;

[0020] Figure 2 A schematic view of the self-sharpening scissors shearing material is shown;

[0021] Figure 3 A rear view of the self-sharpening scissors is shown;

[0022] Figure 4 A cross-sectional structure schematic view of the first scissors blade of the self-sharpening scissors is shown;

[0023] Figure 5 A preparation process of the scissors blade is shown;

[0024] Figure 6A preparation process of a metal chromium layer and a cermet doped layer of a shear blade is shown.

[0025] Explanation of main element symbols:

[0026] 100 - first shear blade; 200 - second shear blade; 300 - rotation shaft; 400 - coating area; 500 - coating; 600 - primer layer; 700 - first base; 800 - first cutting edge; 810 - second cutting edge; 900 - material. DETAILED DESCRIPTION

[0027] Embodiments of the present application are described in detail below with reference to examples illustrated in the accompanying drawings, in which the same or similar elements or elements having the same or similar functions are denoted by the same or similar reference numerals throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present application, and should not be understood as limiting the present application.

[0028] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0029] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0030] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] In the present application, unless otherwise explicitly specified and limited, a first feature is "on" or "under" a second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature is "over", "above" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature is "under", "below" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0032] Embodiment one

[0033] Please refer to Figures 1 to 3 A self-sharpening scissors comprises a scissors blade and a coating. The scissors blade comprises a first scissors blade 100 and a second scissors blade 200. The first scissors blade 100 is provided with a first cutting edge 800. The second scissors blade 200 is identical in structure to the first scissors blade 100, and is provided with a second cutting edge 810. The first scissors blade 100 and the second scissors blade 200 are connected through a pivot 300. The inner side of the first scissors blade 100 and the second scissors blade 200, which are in contact with each other during shearing, are provided with a coating area 400. The coating is provided on the coating area 400. The coating 500 is provided on the side of the first scissors blade 100 close to the second scissors blade 200. The coating 500 is also provided on the side of the second scissors blade 200 close to the first scissors blade 100.

[0034] In the present embodiment, the coating 500 is a doped layer comprising a metal element and any one of a corresponding metal nitride, metal carbide or metal carbonitride.

[0035] In the present embodiment, the weight percentage of the metal element in the coating 500 is 50-95%, and the remaining components are any one of a corresponding metal nitride, metal carbide or metal carbonitride.

[0036] In the present embodiment, the coating 500 is one of a doped layer of chromium and chromium nitride, a doped layer of chromium and chromium carbide, a doped layer of chromium and chromium carbonitride, a doped layer of titanium and titanium nitride, a doped layer of titanium and titanium carbide, a doped layer of titanium and titanium carbonitride, a doped layer of molybdenum and molybdenum nitride, a doped layer of molybdenum and molybdenum carbide, a doped layer of molybdenum and molybdenum carbonitride, a doped layer of vanadium and vanadium nitride, a doped layer of vanadium and vanadium carbide, a doped layer of vanadium and vanadium carbonitride, a doped layer of zirconium and zirconium nitride, a doped layer of zirconium and zirconium carbide, and a doped layer of zirconium and zirconium carbonitride.

[0037] In the embodiment, the doped metal nitride, metal carbide or metal carbonitride in the coating layer 500 has high compactness, so that the hardness of the coating layer 500 is higher than that of the base of the first blade 100 and the base of the second blade 200, and the plasticity of the elemental metal phase in the coating layer 500 is better than that of the base of the first blade 100 and the base of the second blade 200, having a metal plasticity. Since the coating layer 500 is mainly composed of a metal phase and has a metal plasticity, in the shearing process of the second blade 200 and the first blade 100, the coating layer 500 on the coating layer area 400 can be plastically deformed in the mutual friction to adapt to the first blade edge 800 and the second blade edge 810.

[0038] In the embodiment, when the coating layer 500 is a doped layer of chromium and chromium nitride, the weight percentage content of chromium in the doped layer is 50-90%, and the rest is chromium nitride ceramic. The chromium nitride ceramic can be a hexagonal close-packed dichromium nitride phase.

[0039] Please refer to Figure 4 In the embodiment, the self-sharpening scissors further comprise a primer layer 600. The primer layer 600 is arranged between the first base 700 of the first blade 100 and the coating layer 500.

[0040] In the embodiment, the primer layer 600 is further arranged between the second base of the second blade 200 and the coating layer 500.

[0041] In the embodiment, the primer layer 600 is a metal elemental primer layer, which is used to increase the bonding force between the first base 700 of the first blade 100 and the coating layer 500 and the bonding force between the second base of the second blade 200 and the coating layer 500, thereby reducing the peeling risk of the coating layer 500 and the primer layer 600 during use and improving the shearing force and shearing efficiency of the self-sharpening scissors.

[0042] In the embodiment, the thickness of the coating layer 500 is 0.5-10 um, the thickness of the primer layer 600 is 0-0.5 um, and the total thickness of the coating layer 500 and the primer layer 600 is 0.5-10 um.

[0043] In other embodiments, the coating layer 500 is further arranged on the outer side of the first blade 100 and the second blade 200. The coating layer 500 is further arranged on the side of the first blade 100 close to the first blade edge 800 and the side of the second blade 200 close to the second blade edge 810.

[0044] Please refer to Figure 2In the embodiment, the self-sharpening scissors cut the material 900 in the closed shearing process by the hinge area between the first blade edge 800 and the second blade edge 810, and the material 900 is separated from the coating 500 on the coating area 400 by friction. Since the coating 500 is mainly composed of a metal phase and has a metal plastic deformation ability, the two coatings 500 on the coating area 400 can be plastically deformed in mutual friction to adapt to the first blade edge 800 and the second blade edge 810, thereby completing the shearing of the material 900. After shearing, in the opening process of the self-sharpening scissors, the coating 500 on the coating area 400 close to the first blade edge 800 contacts and moves towards the coating 500 on the coating area 400 close to the second blade edge 810, thereby repairing the angles of the first blade edge 800 and the second blade edge 810 damaged in the shearing process, generating a self-sharpening effect, keeping the first blade edge 800 and the second blade edge 810 sharp, improving the shearing force and shearing efficiency of the self-sharpening scissors, and prolonging the service life.

[0045] Embodiment two

[0046] Please refer to Figure 5 The embodiment provides a preparation method of a scissors blade, comprising the following steps:

[0047] S100: ultrasonic cleaning the high-speed steel substrate of the scissors blade in alcohol to obtain a smooth surface, and then placing the high-speed steel substrate in a magnetron sputtering vacuum cavity, pumping the vacuum cavity to an air pressure of 5*10 -3 Pa, and heating to 200 DEG C to obtain a first workpiece;

[0048] S200: filling argon into the vacuum cavity until the air pressure in the vacuum cavity reaches 0.8 Pa, cleaning the first workpiece by an ion source, the ion source current is 10 A, at the same time, taking the first workpiece as a cathode, applying a negative bias voltage, setting the negative bias voltage to 200-300 V, the frequency is 80 kHz, the duty cycle is 80%, and the first workpiece is cleaned by plasma etching for 20 min to obtain a second workpiece;

[0049] S300: filling argon into the vacuum cavity and maintaining the air pressure in the vacuum cavity at 0.3-0.8 Pa, opening the rotating magnetron chromium target power supply, the chromium target power supply is connected with a hipims power supply, the current is set to 1-3 A, the frequency is 300 Hz, the pulse width is 80-150 us, the pulse bias voltage is synchronized with the hipims pulse, the bias voltage value is 400-600 V, the bias voltage pulse is delayed 10-40 us from the hipims pulse, the pulse width is 60-100 us, the second workpiece is cleaned by corresponding metal chromium ion etching, and a third workpiece is obtained after cleaning for 10 min;

[0050] S400: filling argon into the vacuum chamber, maintaining the gas pressure of the vacuum chamber at 0.3-0.8Pa, gradually filling nitrogen into the vacuum chamber, maintaining the gas pressure in the vacuum chamber at 0.5-0.6Pa, finally making the flow ratio of nitrogen and argon 0.1-0.2, and gradually reducing the pulse bias value to 80V, forming a coating layer on the third workpiece, the coating layer is a dense doped layer of metallic chromium and chromium nitride, and the scissor blade is obtained after 60min of deposition.

[0051] In this embodiment, the coating layer in S400 is a dense doped layer of metallic chromium and chromium nitride, the hardness of the coating layer is 17.5GPa, and the thickness of the coating layer is 1.2um.

[0052] In other embodiments, the coating layer is prepared by high-power pulsed magnetron reactive magnetron sputtering.

[0053] In other embodiments, the coating layer is prepared by multi-arc ion plating.

[0054] In this embodiment, the magnetron chromium target power source in S300 can also be any one of a magnetron titanium target power source, a magnetron molybdenum target power source, a magnetron vanadium target power source, and a magnetron zirconium target power source, and the metallic chromium layer in S400 can also correspond to any one of a metallic titanium layer, a metallic molybdenum layer, a metallic vanadium layer, and a metallic zirconium layer, and the dense doped layer of metallic chromium and chromium nitride in S400 can also correspond to any one of a dense doped layer of metallic titanium and titanium nitride, a dense doped layer of metallic molybdenum and molybdenum nitride, a dense doped layer of metallic vanadium and vanadium nitride, and a dense doped layer of metallic zirconium and zirconium nitride.

[0055] In this embodiment, the scissor blade with any one of the dense doped layer of metallic chromium and chromium nitride, the dense doped layer of metallic titanium and titanium nitride, the dense doped layer of metallic molybdenum and molybdenum nitride, the dense doped layer of metallic vanadium and vanadium nitride, and the dense doped layer of metallic zirconium and zirconium nitride deposited thereon is installed into the self-sharpening scissors through the rotating shaft.

[0056] Embodiment three

[0057] This embodiment provides a scissor blade, which is prepared by the above-mentioned method for preparing a scissor blade and can be installed into self-sharpening scissors through a rotating shaft.

[0058] In order to better illustrate the self-sharpening function of the scissor blade involved in this embodiment, the following example verification test is performed:

[0059] Experimental group one: a coating is formed on the inner side of the high speed steel substrate scissors blade by the above high power pulse magnetron sputtering hipims method, the coating is a dense doped layer of metal phase chromium and chromium nitride, the hardness is 17.5 GPa, and the thickness is 1.2 um, and the scissors blade with the coating is installed into a first scissors through a rotating shaft.

[0060] Experimental group two: the high speed steel substrate scissors blade without the coating in experimental group one is assembled into a second scissors through a rotating shaft.

[0061] The first scissors and the second scissors are simultaneously subjected to cloth shearing test, and a two-group scissors service life comparison table as shown in table 1 is obtained, after 400,000 times of cloth shearing test of the first scissors, the self-sharpening function disappears, the blade edge becomes blunt, and the cumulative wear width of the blade edge reaches 2 mm, after 60,000 times of cloth shearing test of the second scissors, the blade edge becomes blunt, and the cumulative wear width of the blade edge is less than 0.5 mm.

[0062] Table 1: two-group scissors service life comparison table

[0063]

[0064] Since it is difficult to ensure that the experimental conditions are completely consistent, there is a certain error in the above experimental data, but it does not affect the final experimental results, as shown in table 1, the service life of the first scissors is obviously higher than that of the second scissors, after 60,000 times of cloth shearing test of the second scissors, the blade edge becomes blunt and cannot shear the cloth again, since the shearing life is small, the cumulative wear width of the blade edge of the second scissors when the blade edge becomes blunt is smaller than that of the first scissors, since the plastic deformation ability of the substrate of the second scissors is weak, the damaged blade edge angle cannot be repaired during shearing, and with the extension of the use time, the blade edge is prone to become blunt, and compared with the first scissors with the self-sharpening function, the service life is shorter.

[0065] It should be noted that in table 1, the first scissors in experimental group one has a cumulative wear width of 2 mm after 400,000 times of cloth shearing, at this time, the self-sharpening function of the first scissors disappears, the blade edge becomes blunt, but the first scissors can still shear the cloth until the substrate of the first scissors is worn out.

[0066] Example four

[0067] Please refer to Figure 6 The embodiment provides a preparation method of a metal chromium layer and a metal ceramic doped layer of a scissors blade, comprising the following steps:

[0068] S100: ultrasonic cleaning of the high speed steel substrate of the scissors blade in alcohol to obtain a smooth surface, then put into a magnetron sputtering vacuum cavity, vacuum the vacuum cavity to 5*10 -3 Pa, and heat to 200 DEG C to obtain a first workpiece;

[0069] S200: filling argon into the vacuum cavity until the gas pressure in the vacuum cavity reaches 0.8 Pa, cleaning the first workpiece by an ion source with an ion source current of 10 A, taking the first workpiece as a cathode, applying a negative bias voltage with a value of 200-300 V, a frequency of 80 kHz and a duty cycle of 80%, and performing plasma etching cleaning on the first workpiece, to obtain a second workpiece after cleaning for 20 min;

[0070] S300: filling argon into the vacuum cavity and maintaining the gas pressure in the vacuum cavity at 0.3-0.8 Pa, turning on a rotating magnetic chromium target power source, connecting the chromium target power source to a hipims power source, setting the current to 1-3 A, the frequency to 300 Hz, the pulse width to 80-150 us, the pulse bias voltage to 400-600 V in synchronization with the hipims pulse, the bias voltage pulse to be started with a delay of 10-40 us relative to the hipims pulse, the pulse width to be 60-100 us, and performing ion etching cleaning on the second workpiece with corresponding metal chromium to obtain a third workpiece after cleaning for 10 min;

[0071] S310: maintaining the gas pressure in the vacuum cavity at 0.3-0.8 Pa, setting the current to 12 A, the frequency to 400 Hz, the pulse width to 100 us, and the pulse bias voltage to 200-120 V, and depositing the metal chromium layer on the third workpiece, the thickness of the metal chromium layer being 0.2 um after deposition for 10 min, to obtain a fourth workpiece;

[0072] S400: keeping the argon flow rate unchanged, gradually filling nitrogen into the vacuum cavity, maintaining the gas pressure in the vacuum cavity at 0.5-0.6 Pa, finally making the flow rate ratio of nitrogen and argon 0.1-0.2, gradually reducing the pulse bias voltage to 80 V, and depositing the metal ceramic doped layer on the fourth workpiece after deposition for 60 min, the hardness of the metal ceramic doped layer being 17.5 GPa, and the thickness of the metal ceramic doped layer being 1.2 um.

[0073] In this embodiment, the metal chromium layer in S400 is a primer layer, and the metal ceramic doped layer in S500 is a dense doped layer of metal phase chromium and chromium nitride.

[0074] In this embodiment, the metal chromium layer is between the scissors base and the metal ceramic doped layer, and the scissors blade on which the metal primer chromium layer and the dense doped layer of metal phase chromium and chromium nitride are deposited can be installed into a scissors with a self-sharpening function through a rotating shaft.

[0075] In other embodiments, the magnetron chromium target power source in the S300 can also be any one of a magnetron titanium target power source, a magnetron molybdenum target power source, a magnetron vanadium target power source, a magnetron zirconium target power source, the metal chromium layer in the S400 can also correspond to any one of a metal titanium layer, a metal molybdenum layer, a metal vanadium layer, a metal zirconium layer, and the metal phase chromium and chromium nitride dense doped layer in the S500 can also correspond to any one of a metal phase titanium and titanium nitride dense doped layer, a metal phase molybdenum and molybdenum nitride dense doped layer, a metal phase vanadium and vanadium nitride dense doped layer, a metal phase zirconium and zirconium nitride dense doped layer.

[0076] Embodiment five

[0077] The embodiment provides a scissors blade, which comprises the metal chromium layer and the metal ceramic doped layer prepared by the preparation method of the metal chromium layer and the metal ceramic doped layer of the scissors blade, the metal chromium layer enhances the bonding force between the base and the metal ceramic doped layer of the scissors blade, reduces the risk of peeling of the metal ceramic doped layer of the scissors blade during use, and improves the service life of the scissors blade.

[0078] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present specification and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0079] Although the embodiments of the present application have been shown and described above, it should be understood that the above-described embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A self-sharpening scissors characterized by, The utility model relates to a self-sharpening shear blade and a coating layer thereof, and belongs to the technical field of shear blades. The shear blade comprises a first shear blade and a second shear blade, the first shear blade is provided with a first blade edge, the second shear blade is provided with a second blade edge, the first shear blade and the second shear blade are connected through a rotating shaft, and the inner side surfaces of the first shear blade and the second shear blade, which are in contact with each other during shearing, are both provided with a coating area. The coating layer is arranged on the coating area. The coating layer is arranged on the side of the first shear blade close to the second shear blade and on the side of the second shear blade close to the first shear blade. The coating layer is mainly composed of a metal phase. The two coating layers on the coating area can be plastically deformed during mutual friction to adapt to the first blade edge and the second blade edge, complete the shearing of materials, and after the shearing is completed, the coating layer close to the first blade edge of the coating area and the coating layer close to the second blade edge of the coating area contact and move towards each other during the opening of the self-sharpening shear blade, can repair the angles of the first blade edge and the second blade edge damaged during shearing, and realize self-sharpening.

2. The self-sharpening scissors of claim 1, wherein, The weight percentage of the metal element in the coating layer is 50-95%.

3. The self-sharpening scissors of claim 1, wherein, The metal element is any one of chromium, titanium, molybdenum, vanadium and zirconium.

4. The self-sharpening scissors of claim 1, wherein, The self-sharpening shear blade further comprises a primer layer. The primer layer is arranged between the base of the shear blade and the coating layer, and is a metal element layer.

5. The self-sharpening scissors of claim 4, wherein, The thickness of the coating layer is 0.5-10 um, and the thickness of the primer layer is 0-0.5 um.

6. The self-sharpening scissors of claim 1, wherein, The coating layer is also arranged on the outer side surface of the shear blade.

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