CN115416053A

CN115416053A - Tool and method of manufacturing a tool

Info

Publication number: CN115416053A
Application number: CN202211194291.3A
Authority: CN
Inventors: 张静; 瞿义生; 张明; 袁华庭
Original assignee: Wuhan Supor Cookware Co Ltd
Current assignee: Wuhan Supor Cookware Co Ltd
Priority date: 2022-09-28
Filing date: 2022-09-28
Publication date: 2022-12-02

Abstract

The present application provides a tool and a method of manufacturing a tool. The cutter is provided with a layered composite structure along the length direction, the layered composite structure is formed by a plurality of branch layers which are alternately overlapped along the length direction and have different hardness, the hardness of the branch layers is alternately arranged along the length direction of the cutter in a high-low mode, the layered composite structure at least forms a cutting edge part of the cutter, and the cutting edge part is provided with a micro-sawtooth structure. The cutter that makes according to this application can be sharp lastingly to difficult emergence sword phenomenon.

Description

Tool and method of manufacturing a tool

Technical Field

The application relates to the technical field of kitchen cutters, in particular to a cutter and a method for manufacturing the cutter.

Background

The knife is one of the necessary tools in the kitchen ware equipment. The sharpness of the tool is an important factor in characterizing the performance of the tool. The existing material for making the cutter is generally stainless steel material. The cutting edge of the cutter made of the material inevitably impacts on hard materials (such as chopping boards and bones) in the daily use process, and obvious bending (namely edge rolling) phenomenon appears at the cutting edge after the cutter is used for a period of time. In addition, the sharpness of the blade is obviously reduced after the blade is used for a short time, and the use requirement of a consumer cannot be met.

For this reason, in the prior art, a hard alloy is provided on the surface layer of the tool to form a hard coating, and the durable sharpness of the tool is improved by the hard coating. However, after the hard coating is worn, the durable sharpness of the tool is drastically reduced, and thus the use requirement of consumers cannot be met.

Disclosure of Invention

Therefore, the object of the present application is to provide a cutter and a method for manufacturing the cutter, in order to solve the problem that the lasting sharpness of the cutter in the prior art is not good, through forming a plurality of layers with hardness in high-low alternative arrangement along the length direction of the cutter, constitute the cutter through a plurality of layers, when the cutter is polished along the thickness direction, under the condition that the polishing conditions are consistent, each layer is different because of the hardness, thereby the wearing capacity in the length direction is different, and then the formation of the edge part with the micro-sawtooth structure along the length direction is facilitated, so as to promote the sharpness, because the edge part of the cutter is the form of the laminated composite structure along the thickness direction, after polishing at every time, the sharpness can be reacquired, so the lasting sharpness can be promoted.

According to a first aspect of the present application, there is provided a cutting tool having a layered composite structure along a length direction, the layered composite structure being formed by a plurality of branch layers alternately stacked along the length direction, hardness of the plurality of branch layers being alternately arranged in a high-low manner along the length direction, the layered composite structure constituting at least a cutting edge portion of the cutting tool, the cutting edge portion of the cutting tool having a micro-saw-tooth structure.

In an embodiment, the plurality of branch layers have the same thickness, and the plurality of branch layers are formed by overlapping a plurality of same laminar units, wherein each laminar unit comprises an even number of layers.

In an embodiment, the plurality of sub-layers are formed from a plurality of ferrous alloy materials having a hardness differential of 1-10 HRC; the thickness of each branch layer is 500-700 μm.

According to a second aspect of the present application, there is provided a method of manufacturing a tool, the method of manufacturing a tool comprising:

forming a raw material block having a layered composite structure in a width direction, wherein the layered composite structure is formed by a plurality of branch layers alternately stacked in the width direction, and the hardness of the plurality of branch layers is alternately arranged in a high-low manner in the length direction; shaping the raw material block along the width direction to obtain a cutter blank body with the layered composite structure in the length direction; and polishing the cutter blank to obtain the cutter with a cutting edge part of a micro-sawtooth structure formed by the layered composite structure in the length direction.

In an embodiment, the step of forming the block of raw material comprises: providing a plurality of iron alloy materials, and alternately arranging the iron alloy materials according to the hardness; the method comprises the steps of sequentially adopting the multiple ferroalloy materials to carry out 1 st, 2 nd, 8230, 823030, N times of spraying to respectively form 1 st, 2 nd, 8230, 8230and N branch layers, and accordingly obtaining a raw material block with a laminated composite structure, wherein N is a positive integer not less than 100.

In the embodiment, the prepressing treatment step is carried out once after spraying for each time 1, 2, 8230, N-1 times; after the Nth spraying, the hot isostatic pressing sintering process is carried out on the formed raw material block with the laminated composite structure, so that the adjacent layers are embedded with each other and the adjacent particles of each branch layer have preset pores.

In an embodiment, the plurality of sub-layers are formed by laminating a plurality of identical layered units, each layered unit including a first sub-layer and a second sub-layer, and the step of forming each layered unit includes: providing a first ferroalloy material, and spraying the first ferroalloy material to form a first sub-layer; and providing a second iron alloy material, and spraying the second iron alloy material on the first sub-layer to form a second sub-layer, wherein the hardness of the first iron alloy material is different from that of the second iron alloy material.

In an embodiment, the thickness of the first sub-layer and the thickness of the second sub-layer are the same, wherein the hardness of the first ferrous alloy material is greater than the hardness of the second ferrous alloy material and the grain size of the first ferrous alloy material is less than the grain size of the second ferrous alloy material; alternatively, the hardness of the first iron alloy material is less than the hardness of the second iron alloy material and the grain size of the first iron alloy material is greater than the grain size of the second iron alloy material.

In an embodiment, the difference between the grain size of the first and second ferroalloy materials is 10 to 60 μm, one of the first and second ferroalloy materials has a grain size of 70 to 100 μm, and the other of the first and second ferroalloy materials has a grain size of 40 to 60 μm.

In an embodiment, before the step of grinding the tool blank, the method of manufacturing a tool further comprises: and carrying out roll forging treatment on the cutter blank at a preset temperature along the length direction of the cutter blank so that the branch layers of the cutter blank are embedded with each other.

In an embodiment, the ferrous alloy material comprises a martensitic stainless steel material of at least two of 3Cr13, 4Cr13, 5Cr15MoV, 6Cr13MoV, 7Cr17MoV and 102Cr17MoV.

According to the cutter of this application, through forming a plurality of layers that hardness is high-low alternate arrangement along the length direction of cutter, when polishing along thickness direction to the cutter, under the unanimous condition of polishing, thereby each layer can be different because of the volume of grinding along length direction hardness difference to can form the cutter that has little sawtooth structure at blade portion. On the one hand, because the blade portion atress dispersion of little sawtooth structure can avoid taking place "sword" phenomenon. On the other hand, when the blade portion of little sawtooth structure strikes on hard material, its atress mode is point atress, compares with the atress mode for the continuous type camber form blade structure of line atress, and under the condition of equal atress, the pressure that the point portion of the blade portion of little sawtooth structure was used in on the edible material is bigger for the blade portion cuts into in the edible material more easily, consequently can have better sharpness. In addition, because the cutting edge part of the cutter is in a laminated composite structure form along the thickness direction, the sharpness can be obtained again after each grinding, and the lasting sharpness can be improved.

Drawings

The above and other objects and features of the present application will become more apparent from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a schematic top view of a block of raw material according to an embodiment of the present application;

FIG. 2 is a schematic view of a tool according to a first embodiment of the present application;

FIG. 3 is an enlarged schematic view at I of FIG. 2 according to the present application;

FIG. 4 is a schematic structural view of a tool according to a second embodiment of the present application;

fig. 5 is a schematic view of a tool according to a third embodiment of the present application.

Detailed Description

The inventive concepts of the present application will be described more fully hereinafter.

Iron alloy materials, such as stainless steel materials, have excellent properties such as being less susceptible to corrosion, having good hardness, and being inexpensive. Thus, a ferrous alloy material may be used as the material for forming the long lasting sharp cutting tool.

The inventors have found that by forming a plurality of support layers having hardness alternately arranged in the longitudinal direction of the tool, when the tool is ground in the thickness direction, the grinding amount differs depending on the hardness in the longitudinal direction of each support layer when the grinding conditions are the same, and thus a tool having a micro-saw-tooth structure at the cutting edge portion can be formed. The cutting edge part of the micro-sawtooth structure is subjected to dispersed stress, so that the phenomenon of edge curling can be avoided; on the other hand, when little sawtooth structure's blade portion strikes on hard material, its atress mode is point atress, compares with the atress mode for the continuous type arc form blade structure of line atress, and under the circumstances of equal atress, the pressure that the point portion of little sawtooth structure's blade portion was used in on the edible material is bigger for the blade portion cuts into in the edible material more easily, consequently can be sharp lastingly. In addition, because the cutting edge of the cutter is in a layered composite structure along the thickness direction, the sharpness can be obtained again after each grinding, and the lasting sharpness can be improved.

The inventive concept of the present application will be described in detail below with reference to exemplary embodiments.

According to a first aspect of the present application, a tool is provided. According to the application, the cutter has a layered composite structure along the length direction, wherein the layered composite structure is formed by a plurality of branch layers which are overlapped along the length direction of the cutter, and the hardness of the branch layers is alternately arranged in the height direction along the length direction of the cutter. Wherein, the layered composite structure at least forms the cutting edge part of the cutter, and the cutting edge part of the cutter has a micro-sawtooth structure.

In an embodiment of the present application, the micro-sawtooth structure is formed by grinding a layered composite structure.

The thickness of the layers is the same or similar, depending on the application. In an exemplary embodiment, the thickness difference between adjacent sublayers is between 0-100 μm. Specifically, the thickness of each branch layer is in the range of 500 μm to 700 μm.

According to the application, the layered composite structure can be formed by compounding any number of sub-layers. According to one embodiment of the present application, a plurality of different ferrous alloy materials may be selected and arranged in an alternating hardness distribution to form a layered composite structure of the cutting tool according to the present application. In these embodiments, the number of layers of the layered composite structure may not be necessarily limited. In the example shown in fig. 5, the number of layers of the layered composite strucmre is an odd number of layers. According to another embodiment of the present application, an even number of ferrous alloy materials may be sprayed sequentially and alternated multiple times to form a layered composite structure of the cutting tool according to the present application.

In one exemplary embodiment, the plurality of branch layers is formed by stacking a plurality of identical layer units, wherein each layer unit is composed of an even number of layers. According to an exemplary embodiment of the present application, the number of layers included in the layered unit may be an even number not less than 50. According to an exemplary embodiment, each layered unit may include two sub-layers stacked in sequence, or each layered unit may include four sub-layers stacked in sequence.

Fig. 2 is a schematic structural view of a tool according to a first embodiment of the present application. Fig. 3 is an enlarged schematic view at I of fig. 2 according to the present application. As shown in fig. 2, the cutter 20 is formed by stacking a plurality of layer units 21 in the longitudinal direction, wherein each layer unit 21 includes a first sublayer 211 and a second sublayer 212 having different hardness, so that the plurality of layer units 21 constitute a plurality of layers having hardness alternately arranged in the longitudinal direction of the cutter. As shown in fig. 3, the cutting edge portion of the cutter 20 has a micro-saw tooth structure.

Fig. 4 is a schematic structural view of a cutter according to a second embodiment of the present application. As shown in fig. 4, each of the layered units 21 includes a first sublayer 211, a second sublayer 212, a third sublayer 213, and a fourth sublayer 214 having different hardnesses from each other.

According to the application, the first sub-layer 211 in the first layer unit 21 is arranged close to the end of the cutter which is far away from the handle in the length direction. The hardness of the first sub-layer 211 may be less than that of the second sub-layer 212, and the hardness of the first sub-layer 211 may also be greater than that of the second sub-layer 212.

According to the application, the branch layer has proper thickness, and a micro sawtooth structure with regular arrangement can be formed. In an exemplary embodiment, the first sub-layer 211 and the second sub-layer 212 have the same thickness, the two sub-layers form the layer unit 21, and the plurality of sub-layers formed by stacking and connecting the plurality of layer units 21 are arranged in a regular alternating manner, so as to form a regular micro-zigzag structure.

In order to make it easier for the adjacent branch layers to form a proper micro-sawtooth structure in the subsequent grinding process, the adjacent branch layers need to be provided with a proper hardness difference. In an exemplary embodiment, the difference in hardness of the ferrous alloy materials making up the adjacent leg layers may be in the range of 1-10 HRC. In the actual manufacturing process, the iron alloy materials with different hardness are selected to enable the formed branch layer to have proper hardness difference.

In an embodiment, the individual serrations of the micro-serration structure have a height in the range of 100 μm to 200 μm and a width in the range of 500 μm to 700 μm.

As is well known, stainless steel is relatively readily available and corrosion resistant, and is inexpensive to manufacture into a cutting tool. In an embodiment, the iron alloy material is a stainless steel material, and each of the branch layers is a stainless steel layer. As will be described in detail later.

step S101, forming a raw material block body with a layered composite structure along the width direction, wherein the layered composite structure is formed by a plurality of branch layers which are alternately overlapped along the width direction, and the hardness of the plurality of branch layers is alternately arranged along the width direction.

And S102, forming the raw material block in the width direction to obtain a cutter blank with a laminated composite structure in the length direction.

And step S103, polishing the cutter blank to obtain the cutter with the cutting edge part of the micro-sawtooth structure formed by the laminated composite structure in the length direction.

Hereinafter, a method of manufacturing the cutter according to the present application will be described in detail.

Providing a ferroalloy material

Different ferroalloy materials are prepared, and the ferroalloy materials can be in a powder form or a strip form. The iron alloy material may be a stainless steel material, and specifically, may be martensitic stainless steel. The martensitic stainless steel may include 3Cr13, 4Cr13, 5Cr15MoV, 6Cr13MoV, 7Cr17MoV and 102Cr17MoV. According to the present application, the higher the carbon content of the stainless steel material, the higher the hardness of the branch layer formed therefrom. The carbon content sequence from small to large is as follows: 3Cr13, 4Cr13, 5Cr15MoV, 6Cr13MoV, 7Cr17MoV, 102Cr17MoV.

Preparation of the raw Material Block

According to the present application, the raw material block may be formed by laminating a plurality of mutually different sub-layers in the width direction. Specifically, the plurality of branch layers may be formed by stacking and connecting a plurality of identical layer units in the width direction. An example of forming a raw material block by stacking and connecting a plurality of mutually different branch layers in the width direction will be described.

According to the application, the ferroalloy material can be granular, the raw material block with the laminated composite structure is formed by overlapping and connecting a plurality of branch layers in the width direction, and the step of preparing the raw material block comprises the following steps: providing a plurality of iron alloy materials and alternately arranging the iron alloy materials according to the hardness; a plurality of ferroalloy materials are sequentially adopted to carry out spraying for 1 st, 2 nd, 8230, N times to respectively form 1 st, 2 nd, 8230, 8230and N branch layers, so that a raw material block with a laminated composite structure is formed, wherein N is a positive integer not less than 100. It should be noted that the number of layers in the drawings of the present invention is merely exemplary and is not shown in practice. In the case where the same layered unit is not included in the layered composite structure, the composite coating may be composed of an odd number of layers or an even number of layers. When the layered composite structure is prepared, the layered composite structure with the hardness in alternate distribution can be formed only by alternately arranging a plurality of iron alloy materials according to the hardness and spraying the iron alloy materials in sequence. Whereas in the case of a layered composite structure comprising identical layered units, the layered composite structure consists of an even number of layers. In the example shown in fig. 4, the layered composite structure is composed of an even number of layers, and in the example shown in fig. 5, the layered composite structure is composed of an odd number of layers.

Fig. 1 is a schematic top view of a block of raw material according to an embodiment of the present application. As shown in fig. 1, spraying is sequentially performed 1, 2, 8230, and 6 times to form 1, 2, 8230, and 6 sub-layers, respectively, thereby forming a raw material block 10 having a layered composite structure. In the first spraying, any substrate may be used as the carrier, and after the last spraying, the carrier substrate is cut to leave a portion of the layered composite structure as the raw material block 10.

Fig. 5 is a schematic view of the structure of a tool according to a third embodiment of the present application. As shown in fig. 5, the cutter 20 includes 1 st, 2 nd, 8230 # \8230 #, N buttresses alternately arranged in the longitudinal direction. Wherein, the grain diameters of the branch layers are in high-low alternative distribution in sequence, and the hardness of the branch layers is in high-low alternative arrangement in the length direction.

The kitchen cutter is mostly the uneven thickness structure, and the stress of cutter is too big, can lead to the low qualification rate of cutter, and still can have the defect that cutter blade portion collapses. Therefore, during the manufacturing process, it is desirable to have less stress in the tool. According to the application, the ferroalloy material is granular, and a pre-pressing treatment step is performed after spraying for 1, 2, 8230, 8230and N-1 times; after the Nth spraying, the formed raw material block with the laminated composite structure is treated by a hot isostatic pressing sintering process, so that the adjacent branch layers are embedded with each other, and the adjacent particles of each branch layer have preset pores.

In these embodiments, the raw material block 10 is sintered and formed by using a granular iron alloy material, during the sintering, the internal stress of the raw material block 10 is low, and at the same time, after the hot isostatic pressing sintering is completed, the raw material block can be cooled along with the furnace, and due to the low cooling rate, the internal stress of the raw material block 10 can be further reduced, so that the raw material block 10 with low internal stress and a laminated composite structure can be obtained, and the method can be suitable for manufacturing cutters with uneven thickness.

Hereinafter, the raw material block of the present application will be specifically described taking as an example a raw material block formed by a plurality of identical lamellar units being stacked and connected in the width direction.

According to the present application, the plurality of branch layers are formed by stacking a plurality of identical layer units 21. Each of the lamellar units 21 is two sublayers of mutually different hardness, and in the case where the ferroalloy material is in powder form, the step of forming each lamellar unit comprises: the first sub-layer 211 is formed by spraying a first iron alloy material in advance, and then the second sub-layer 212 is formed by spraying a second iron alloy material on the surface of the first sub-layer 211, thereby forming one layer unit 21. In the case where the iron alloy material is in the form of a strip, the step of forming a layered unit comprises: the first sub-layer 211 is formed in advance by using a first iron alloy material, then the second sub-layer 212 is formed by using a second iron alloy material, and the first sub-layer 211 and the second sub-layer 212 are compounded to form a laminated unit 21. In an exemplary embodiment, the step of forming the layered unit 21 includes: spraying stainless steel particles for the first time to form a first sublayer 211, and pre-pressing the first sublayer by adopting hydraulic pressure; a second spray of another stainless steel particle is applied to the first sublayer 211 to form a second sublayer 212, which is preformed using hydraulic pressure to form a layered unit 21. In these embodiments, after each sub-layer is formed, it is pre-pressed (pre-formed) by hydraulic pressure, so that adjacent sub-layers are tightly bonded, and thus the sub-layers are tightly bonded.

According to the present application, after one layer unit 21 is formed, the formation operation of the previous layer unit 21 is repeated, and the next layer unit 21 is formed on the previous layer unit 21, so that a plurality of sub-layers made of a plurality of layer units 21 are alternately formed, thereby constituting the raw material block 10 having a layered composite structure.

According to the present application, when the raw material block 10 reaches a designated thickness (where the designated thickness of the raw material block 10 is taken as the length of the tool and thus may be set according to a predetermined actual length of the tool), the raw material block 10 having the layered composite structure may be sintered so as to fit adjacent sub-layers in the layered composite structure to each other and to have a predetermined porosity between adjacent particles of each sub-layer. In an exemplary embodiment, the predetermined pores have a size in the range of 40 μm to 150 μm. As shown in fig. 3, the predetermined gaps between adjacent particles may add more teeth to the micro-saw tooth structure, so that the micro-saw tooth structure has more teeth, thereby improving the durable sharpness. It should be noted that, during the sintering process, the layered composite structure is in a solid state, and is in a solid-phase sintered state. In particular, by controlling the temperature and pressure during the hot isostatic pressing operation, a predetermined pore structure can be retained between adjacent particles. In an exemplary embodiment, the sintering is performed using a hot isostatic pressing technique for a time period ranging from 3 hours to 4 hours at a temperature ranging from 1050 ℃ to 1200 ℃ and at a pressure ranging from 120Mpa to 150Mpa.

In order to prevent oxidation of the granular iron alloy material during the manufacturing process, the step of forming the raw material block may be performed under a vacuum environment. In an exemplary embodiment, the vacuum degree is controlled to be 0.1-20 Pa in the vacuum environment of the vacuum furnace, spraying and prepressing are carried out on the mould of the vacuum furnace, and the laminated composite structure is repeatedly formed for multiple times.

In an embodiment, the first sublayer 211 and the second sublayer 212 are the same thickness, and each seed layer has a thickness of 500 μm to 700 μm.

According to the present application, the grain size difference of the iron alloy materials forming the adjacent sub-layers may be 10 μm to 60 μm. By setting a predetermined difference in grain size of the iron alloy material forming the adjacent leg layers, the bonding force between the adjacent leg layers can be enhanced.

In some embodiments, the hardness of the first ferrous alloy material is less than the hardness of the second ferrous alloy material and the grain size of the first ferrous alloy material is greater than the grain size of the second ferrous alloy material. In other embodiments, the hardness of the first ferrous alloy material is less than the hardness of the second ferrous alloy material and the grain size of the first ferrous alloy material is greater than the grain size of the second ferrous alloy material.

In the embodiments, by setting the grain size of the material with higher hardness to be relatively smaller, the grain size is smaller after sintering and forming, and more grain boundaries exist, so that dislocation expansion can be hindered, the material strength is higher, the strength of the formed micro-sawtooth structure can be improved, and the lasting sharpness of the cutter is higher.

As shown in fig. 2 and 3, the layered unit 21 is formed of two iron alloy materials, and the layered unit 21 includes first sub-layers 211 and second sub-layers 212 alternately arranged at intervals in a length direction. Two iron alloy materials are required to form such a tool. Where the hardness of the first iron alloy material is less than the hardness of the second iron alloy material, illustratively, the hardness of the first iron alloy material may be in the range of 50-55HRC, the hardness of the second iron alloy material may be in the range of 56-60HRC, the grain size of the first iron alloy material is 70-100 μm, and the grain size of the second iron alloy material is 40-60 μm. In the case where the hardness of the first iron alloy material is greater than that of the second iron alloy material, for example, the hardness of the first iron alloy material may be in the range of 56-60HRC, the hardness of the second iron alloy material may be in the range of 50-55HRC, the grain size of the first iron alloy material is 40-60 μm, and the grain size of the second iron alloy material is 70-100 μm. In the example shown in fig. 2, the hardness of the first sub-layer 211 is greater than the hardness of the second sub-layer 212.

Forming a tool blank

Fig. 1 is a schematic top view of a raw material block according to an embodiment of the present application. Fig. 2 is a schematic structural diagram of a tool according to an embodiment of the present application. As shown in fig. 1 and 2, the resulting raw material block 10 is shaped in the width direction to obtain a tool blank having a layered composite structure in the length direction. The raw material block 10 is formed in the width direction so that the sub-layers in the length direction of the blade portion have different hardness, thereby facilitating the formation of the micro-saw-tooth structure.

According to the application, before the step of grinding the cutter blank, the manufacturing method of the cutter further comprises the following steps: and performing roll forging treatment on the cutter blank at a preset temperature along the length direction so that the branch layers of the cutter blank are embedded with each other. In addition, the thickness of the cutter blank is gradually reduced in the width direction by performing roll forging treatment at a preset temperature, so that a kitchen cutter structure with uneven thickness is formed. Wherein the specific parameters of the rolling treatment are that the rolling pressure is 80MPa to 120MPa, and the rolling temperature is 500 ℃ to 700 ℃. In the embodiments, the support layers of the cutter blank can be embedded with each other through roll forging, the layers of the layered composite structure are tightly combined, processing strengthening can be achieved to a certain extent, and the strength of the cutter blank is enhanced.

According to the application, the grinding machine is adopted to grind along the thickness direction of the cutter, and under the condition that the grinding conditions are consistent, a micro-sawtooth structure is formed on the cutting edge part of the cutter along the length direction.

As shown in fig. 3, the cutting edge of the cutter of the present application has a micro-sawtooth structure. Specifically, the cutter blank is ground by a grinding machine, under the condition that the travelling speeds of the grinding machine are consistent, the grinding amount in the grinding process can be different due to different hardness of a plurality of branch layers with hardness distributed alternately in the length direction (the grinding amount is different due to different hardness), most of the branch layers with relatively high hardness are reserved at the cutting edge part, most of the branch layers with relatively low hardness are ground, and therefore a fine micro-sawtooth structure can be formed at the cutting edge of the cutting edge part in the grinding process. Wherein the height of the micro sawtooth structure is 100-200 μm, and the width is 500-700 μm.

According to the present application, the shape of the micro-saw tooth structure can be set according to actual needs, and the present application does not limit that the micro-saw tooth structure is necessarily formed in a rack-like structure in the extending direction of the cutting edge of the cutter. The micro-saw tooth structure according to the present application forms a continuous wave like structure, for example but not limited to in the extension direction along the cutting edge of the tool (see fig. 3). According to the little sawtooth structure of this application, in the thickness direction of cutter, the tooth of each little sawtooth structure can be the back taper structure. It should be noted that the tip of the micro-saw tooth structure of the present application can be selected according to actual needs, for example, but not limited to, according to the application of the cutter and the cutting requirements of the cutter (hardness of the object to be cut, etc.). The extending direction of the cutting edge of the cutter can be strip-shaped or arc-shaped. When the extension direction of the cutting edge of the cutter is strip-shaped, the extension direction of the cutting edge of the cutter is consistent with the length direction of the cutter.

The method of manufacturing a tool and the tool of the inventive concept have been described above in detail in connection with exemplary embodiments. In the following, the advantageous effects of the inventive concept will be described in more detail with reference to specific embodiments, but the scope of protection of the inventive concept is not limited to the embodiments.

Example 1

A cutter according to example 1 was prepared by the following method.

Step S10, manufacturing a raw material block with a layered composite structure.

Step S11, providing 3Cr13 stainless steel powder with the average grain diameter of 70-100 μm as an iron alloy material, and performing the first sub-layer by spraying the 3Cr13 stainless steel powder for the first time and using hydraulic pressure to form the first sub-layer with the thickness of 600 μm.

And S12, providing 5Cr15MoV stainless steel powder with the average grain diameter of 40-60 mu m as another iron alloy material, spraying the 5Cr15MoV stainless steel powder on the first sub-layer for the second time, and performing the second sub-layer by hydraulic pressure to form the second sub-layer with the thickness of 600 mu m.

And S13, repeating the steps S11 to S12 (namely, performing 3 rd, 4 th, 8230; and 100 times of spraying to form 3 rd, 4 th, 8230; and 100 times of spraying respectively) on the second sub-layer for 50 times, thereby forming a raw material block with the width of 6cm and a laminated composite structure.

And step S20, after the 100 th spraying, treating the formed raw material block with the laminated composite structure by a hot isostatic pressing sintering process. Wherein the sintering time is 3h, the sintering temperature is 1100 ℃, and the pressure is 130MPa.

And step S30, forming the raw material block along the width direction to obtain a cutter blank with a laminated composite structure in the length direction. Wherein, the length direction of the cutter blank is the width direction of the raw material block body, namely 6cm.

And S40, heating the formed cutter blank, and then performing roll forging treatment along the length direction to form the cutter blank with the average thickness of the cutting edge part of 1 mm. Wherein the specific parameters of the rolling treatment are that the rolling pressure is 90MPa and the rolling temperature is 600 ℃.

And step S50, grinding the cutter blank in the thickness direction by the grinding machine under the condition that the grinding machine parameters are consistent, so as to form a fine micro-sawtooth structure at the cutting edge part. Wherein the height of the teeth of the micro saw tooth structure was 200 μm and the width was 500 μm, thereby manufacturing the cutter of example 1.

Example 2

A cutter of example 2 was produced in the same manner as in example 1, except that the step of producing the raw material block having the layered composite structure was performed under a vacuum atmosphere.

Example 3

A cutter of example 3 was produced in the same manner as in example 1, except that step S20 was not performed (i.e., the hot isostatic pressing sintering process was not used for the treatment).

Example 4

The cutter of example 4 was produced in the same manner as in example 1, except that the first sub-layer was formed by first spraying 4Cr13 stainless steel powder instead of 3Cr13 stainless steel powder (and so on for the subsequent formation of the individual layered units).

Example 5

The cutter of example 5 was manufactured in the same manner as in example 1, except that the second sub-layer was spray-formed using 102Cr17MoV stainless steel powder instead of 5Cr15MoV stainless steel powder (and so on for the subsequent formation of the individual layered units).

Example 6

The cutter of example 6 was manufactured in the same manner as in example 1, except that 4Cr13 stainless steel powder was used instead of 5Cr15MoV stainless steel powder to spray form the second sub-layer (and so on for the subsequent formation of the individual layered units).

Example 7

The cutter of example 7 was manufactured in the same manner as in example 1, except that the first sub-layer was sprayed with 5Cr15MoV stainless steel powder instead of 3Cr13 stainless steel powder, and the second sub-layer was sprayed with 3Cr13 stainless steel powder instead of 5Cr15MoV stainless steel powder (and so on for the subsequent formation of the respective layered units).

Example 8

Example 9

The cutting edge portion having a multi-layer structure in the longitudinal direction was formed using the raw material block manufactured in example 1, and the cutting edge portion having the same thickness as that of example was joined by welding to a blade having a thickness of 2mm and forged, thereby manufacturing a cutter of example 9.

Comparative example 1

5Cr15MoV stainless steel blade having a cutting edge portion with an average thickness of 1 mm.

Comparative example 2

3Cr13 stainless steel blade having an average thickness of 1mm at the blade edge portion.

Comparative example 3

102Cr17MoV stainless steel blade having a blade edge portion with an average thickness of 1 mm.

Performance index testing

The thicknesses of the edge portions of the cutting tools in examples 1 to 9 and comparative examples 1 to 3 were the same, and performance index tests were respectively performed thereon, and the test results are reported in table 1 below. The performance test method comprises the following steps:

(1) Initial sharpness: refer to GBT 40356-2021 kitchen knife for testing sharpness. The larger the value of sharpness, the better the initial sharpness, and vice versa the smaller the value of sharpness.

(2) Durable sharpness test method:

the lasting sharpness adopts a simulated tool life test method, and the specific method is described in the following, wherein the larger the value of the lasting sharpness is, the longer the initial sharpness and the lasting sharpness are, and the smaller the value of the lasting sharpness is, the opposite is.

The simulated cutter life testing method specifically comprises the following steps: the cutting edge of the tested cutter is horizontally fixed on the cutter fixing device downwards, and is pressed on the simulator with 16N pressure after a weight is attached. The cutting simulation object (3 mm kraft paper is selected) keeps static, the cutter fixing device is driven through a motor and air pressure to drive the cutter to cut towards the X-axis direction, the speed is 50mm/s reciprocating motion, meanwhile, the Z-axis direction rises, the cutter is displaced 1mm towards the Y-axis direction, the simulation object is molded, the cutting stroke is 100mm, the process is finished after the simulation object is cut for 5 times, and the lasting sharpness of the cutter is judged by adopting an evaluation object (ham sausage). And (4) until the test of the evaluation object is not cut, the test is terminated, and the total cutting times from the beginning to the termination of the test are recorded, namely the durable sharpness of the cutter, wherein the more the total cutting times, the higher the durable sharpness.

TABLE 1 data of the performance tests of the examples of the present application and of the comparative examples

It is well known that the long-lasting sharpness of tools made of 102Cr17MoV martensitic stainless steel is the best level of tools made of current stainless steels. However, the cost of manufacturing the tool therefrom is excessive. According to the comparison, the comparative examples of the embodiment and the corresponding materials are improved. The lifting can reach the best level of a cutter made of 102Cr17MoV martensitic stainless steel, and is even far better than that of the 102Cr17MoV martensitic stainless steel cutter. To sum up, this application guarantees life through the better sublayer of toughness, guarantees the sharpness through the higher sublayer of hardness, combines together multiple material just can obtain the lasting sharp cutter that is fit for the crowd and uses. The cutter that makes according to this application can be sharp lastingly to difficult emergence sword phenomenon.

Although the embodiments of the present application have been described in detail above, those skilled in the art may make various modifications and alterations to the embodiments of the present application without departing from the spirit and scope of the present application. It should be understood that such modifications and variations as would occur to those skilled in the art are considered to be within the spirit and scope of the embodiments of the present application as defined by the claims.

Claims

1. A cutting tool comprising a layered composite structure in a longitudinal direction, the layered composite structure being formed of a plurality of branch layers alternately stacked in the longitudinal direction, the hardness of the plurality of branch layers being alternately arranged in a high-low manner in the longitudinal direction, the layered composite structure constituting at least a cutting edge portion of the cutting tool, the cutting edge portion having a micro-saw-tooth structure.

2. The tool according to claim 1, wherein the plurality of branch layers have the same thickness, the plurality of branch layers being formed by a plurality of identical lamellar units being stacked, wherein each lamellar unit comprises an even number of layers.

3. The tool according to claim 1, wherein the plurality of sub-layers are formed of a plurality of ferrous alloy materials having a hardness differential of 1-10 HRC; the thickness of each branch layer is 500-700 μm.

4. A method of manufacturing a tool, the method comprising:

forming a raw material block having a layered composite structure in a width direction, wherein the layered composite structure is formed by a plurality of branch layers alternately stacked in the width direction, and the hardness of the plurality of branch layers is alternately arranged in a high-low manner in the width direction;

shaping the raw material block along the width direction to obtain a cutter blank body with the layered composite structure in the length direction;

and polishing the cutter blank to obtain the cutter with a cutting edge part of a micro-sawtooth structure formed by the layered composite structure in the length direction.

5. The method of manufacturing a cutting tool of claim 4, wherein the step of forming a block of stock material comprises:

providing a plurality of iron alloy materials, and alternately arranging the iron alloy materials according to the hardness;

the method comprises the steps of sequentially adopting the multiple ferroalloy materials to carry out 1 st, 2 nd, 8230, 823030, N times of spraying to respectively form 1 st, 2 nd, 8230, 8230and N branch layers, and accordingly obtaining a raw material block with a laminated composite structure, wherein N is a positive integer not less than 100.

6. The method for manufacturing a cutting tool according to claim 5, wherein a pre-pressing process step is performed after each spraying of 1 st, 2 nd, \8230, N-1 st times;

after the Nth spraying, the hot isostatic pressing sintering process is carried out on the formed raw material block with the laminated composite structure, so that the adjacent layers are embedded with each other and the adjacent particles of each branch layer have preset pores.

7. The method of claim 5, wherein the plurality of sub-layers are formed by laminating a plurality of identical layered units, each layered unit including a first sub-layer and a second sub-layer,

the step of forming each of the layered units comprises:

providing a first ferroalloy material, and spraying the first ferroalloy material to form a first sub-layer; and providing a second iron alloy material, and spraying the second iron alloy material on the first sub-layer to form a second sub-layer, wherein the hardness of the first iron alloy material is different from that of the second iron alloy material.

8. The method of manufacturing a tool according to claim 7, wherein the thickness of the first sub-layer and the thickness of the second sub-layer are the same,

wherein the hardness of the first iron alloy material is greater than the hardness of the second iron alloy material and the grain size of the first iron alloy material is less than the grain size of the second iron alloy material; alternatively, the hardness of the first iron alloy material is less than the hardness of the second iron alloy material and the grain size of the first iron alloy material is greater than the grain size of the second iron alloy material.

9. The method of manufacturing a tool according to claim 7, wherein the difference between the grain size of the first and second ferrous alloy materials is 10-60 μm, one of the first and second ferrous alloy materials has a grain size of 70-100 μm, and the other of the first and second ferrous alloy materials has a grain size of 40-60 μm.

10. The method of manufacturing a cutting tool according to claim 5, wherein the method of manufacturing a cutting tool further comprises, before the step of grinding the cutting tool blank: and carrying out roll forging treatment on the cutter blank at a preset temperature along the length direction of the cutter blank so that the branch layers of the cutter blank are embedded with each other.

11. The method of manufacturing a tool according to claim 5, wherein the ferrous alloy material comprises a martensitic stainless steel material of at least two of 3Cr13, 4Cr13, 5Cr15MoV, 6Cr13MoV, 7Cr17MoV and 102Cr17MoV.