CN115055685B

CN115055685B - Method for manufacturing cutter and cutter

Info

Publication number: CN115055685B
Application number: CN202210729738.6A
Authority: CN
Inventors: 张明; 张浪; 瞿义生; 袁华庭
Original assignee: Wuhan Supor Cookware Co Ltd
Current assignee: Wuhan Supor Cookware Co Ltd
Priority date: 2022-06-24
Filing date: 2022-06-24
Publication date: 2023-07-25
Anticipated expiration: 2042-06-24
Also published as: CN115055685A

Abstract

The application provides a manufacturing method of a cutter and the cutter. The manufacturing method of the cutter comprises the steps of forming a cutter blank body with preset hardness and a pore structure inside by adopting powder materials through a sintering process; and sharpening the cutting edge of the cutter blank body to expose part of the pore structure and form a saw tooth structure at the cutting edge of the cutter, wherein the powder material comprises C, si, cr, ni, mn, mo and Fe as constituent elements. According to the cutter manufactured by the method, the cutter can be kept sharp, and the edge rolling phenomenon is not easy to occur.

Description

Method for manufacturing cutter and cutter

Technical Field

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

Background

The knife tool is one of the instruments which are frequently needed in daily life. The sharpness of the tool is a major factor in the performance of the tool. The common cutter on the market at present is a martensitic stainless steel cutter, which belongs to one of cutters with better performance. However, this type of tool has the following disadvantages: since the cutting edge of a tool is usually of a thin conical structure, the cutting edge inevitably impinges on hard materials (e.g. chopping boards, bones) during daily use, and after a period of use, a significant bending (i.e. sharpening) occurs at the cutting edge. In addition, sharpness at the cutting edge of martensitic stainless steel cutters also decreases significantly after a short period of use.

Therefore, how to make a cutter sharp permanently is a direction of continuous research in the field of cutter manufacturing technology.

Disclosure of Invention

Therefore, the purpose of the application is to provide a manufacturing method of a cutter and the cutter, so as to solve the problems of insufficient lasting sharpness and easy occurrence of edge rolling of the cutter in the prior art.

According to a first aspect of the present application, there is provided a method of manufacturing a tool, comprising forming a tool blank having a predetermined hardness and having a pore structure therein by a sintering process using a powder material; sharpening the cutting edge of the cutter blank to expose part of pore structures and form a sawtooth structure at the cutting edge of the cutter; wherein, the composition elements of the powder material are C, si, cr, ni, mn, mo and Fe.

In an embodiment, the powder material comprises, in weight percent, 0.01% -0.1% C, 0.05% -0.8% Si, 15% -17% Cr, 0.1% -2% Ni, 0.16% -0.18% Mn, 1.4% -2% Mo, and the balance Fe.

In an embodiment, the step of forming a tool blank comprises: preparing a slurry comprising the powder material, the powder material having a predetermined particle size; forming the slurry into an initial blank body through a die; sintering the initial blank, wherein the cutter blank with preset hardness and pore structure inside is obtained by adjusting parameters of the sintering process.

In an embodiment, the predetermined particle size is 10 μm to 50 μm; the pore structure comprises a preset pore size and the number of pores, wherein the pore size is 3-12 mu m, and the number of pores on a cutter blank per square centimeter is 100-600; the hardness of the cutter blank body is HRC40-HRC55.

In an embodiment, the step of adjusting parameters of the sintering process to sinter the initial green body includes: and placing the initial blank body in a vacuum environment, and then sintering the initial blank body in a stepped heating mode.

In an embodiment, the step of sintering the initial blank by adopting a step-type heating manner includes: heating the initial blank to 450 ℃, then heating to 650-750 ℃ at a heating rate of 4-6 ℃/min, preserving heat for 20-40 min, then heating to 1100-1300 ℃ at a heating rate of 4-6 ℃/min, preserving heat for 10-50 min, and then cooling to room temperature at a cooling rate of 4-6 ℃/min.

In an embodiment, the step of preparing a slurry comprising the powder material comprises: mixing a powder material, a dispersant, a binder, and water to form the slurry, wherein the slurry comprises, in weight percent, 50% -65% of the powder material, 0.3% -0.5% of the dispersant, 0.4% -0.6% of the binder, and the balance water.

In an embodiment, the step of sharpening the cutting edge of the tool blank includes: and adjusting the depth of the sharpening process of the cutter blank body so that the saw tooth structure has a preset height, wherein the preset height is 1-6 mu m.

According to a second aspect of the present application, there is provided a tool comprising a tool body having a predetermined hardness and having a pore structure therein, the tool body being formed by a powder sintering process using a powder material; the cutting edge of the cutter is provided with a sawtooth structure, the sawtooth structure is obtained by sharpening the cutter blank, and the composition elements of the powder material are C, si, cr, ni, mn, mo and Fe.

In an embodiment, the pore structure comprises a predetermined pore size and a pore number, the pore size is 3 μm-12 μm, and the pore number on the cutter blank per square centimeter is 100-600; the average particle size of the powder material is 10-50 mu m; the hardness of the cutter blank body is HRC40-HRC55.

According to the manufacturing method of the cutter, the cutter blank with the preset hardness and the pore mechanism inside is obtained through the sintering process by adopting the powder material, and the cutter cutting edge is polished to expose part of the pore structure outside and form the saw tooth structure at the cutter cutting edge. In addition, the serrated cutting edge structure has preset hardness and is stressed and dispersed, so that the phenomenon of 'rolling edge' is not easy to occur.

Drawings

The foregoing and other objects and features of the 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 microscopic magnification of a cross-section of a tool blank formed from a powder material according to an embodiment of the present application;

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

FIG. 3 is an enlarged schematic view of the portion I in FIG. 2 along the length direction;

fig. 4 is a sintering graph according to an embodiment of the present application.

Detailed Description

The present inventive concept will be described more fully hereinafter with reference to the exemplary embodiments, however, the present inventive concept may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the inventive concept to those skilled in the art.

The existing martensitic stainless steel cutter has obvious bending (namely rolling) phenomenon at the cutting edge due to impact with hard materials such as chopping boards, bones and the like after being used for a period of time. In addition, the sharpness of martensitic stainless steel tools also decreases significantly after a short period of use.

The cutting edge of the existing cutter is usually in a continuous arc-shaped structure, and when the cutter is impacted on hard materials (such as chopping boards and bones) for a long time, the arc-shaped cutting edge structure gradually generates the edge rolling phenomenon. When the cutter is impacted on the chopping board, the harder the cutter is, the less possibility of sharpening occurs, but the harder the cutter is, the problem of tipping occurs on the cutting edge of the cutter can be caused.

In order to solve the problems in the prior art described above, the present application aims to provide a tool that is durable and resistant to cutting (i.e., is not easily tipped or tipping). For this reason, the applicant has investigated the application of powder materials to tools in hopes of providing a new and durable sharp tool.

The powder material belongs to the powder of the alloy material, is generally composed of metal and/or nonmetallic elements, and thus may have the respective advantages of metal and/or nonmetallic elements. Thus, a tool blank having a certain hardness can be formed by selecting a suitable powder material.

However, in the actual manufacturing process, the materials selected for manufacturing the tool are often required to take into account many factors such as manufacturing cost, material strength, and corrosion resistance, and therefore not all powder materials can be suitable for manufacturing the tool. The applicant found that a powder material composed of C, si, cr, ni, mn, mo and Fe multiple elements can form a cutter body with proper strength through a sintering process, so that the cutting edge of a cutter formed by sharpening the cutter body can have proper strength, and the edge rolling or edge chipping is not easy to occur, thereby being capable of prolonging the service life of the cutter.

In addition, the applicant also found that the use of powder materials can enable the interior of the tool blank to have a suitable pore structure by controlling the parameters of the sintering process, and then the tool edge is polished, so that part of the pore structure is exposed and a saw tooth structure is formed at the tool edge, and the saw tooth-shaped edge structure can further avoid the occurrence of a 'rolling edge' phenomenon due to stress dispersion.

In addition, according to this application, when the blade structure of cockscomb structure striking on hard material, its atress mode is the point atress, compares with the continuous arc-shaped blade structure that the atress mode is the line atress, under the condition of equal atress, and the pressure of the tip of blade structure of cockscomb structure on edible material is bigger for blade part cuts into edible material more easily, consequently can lasting sharpness.

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

According to a first aspect of the present application, there is provided a method of manufacturing a tool, the method comprising: forming a cutter blank with preset hardness and a pore structure inside by adopting a powder material through a sintering process; the cutting edge of the cutter blank is subjected to sharpening treatment, so that part of pore structures are exposed, and a saw tooth structure is formed at the cutting edge of the cutter, wherein the powder materials comprise C, si, cr, ni, mn, mo and Fe.

In this application, the pore structure is formed by a plurality of pores that are interconnected and/or closed. Illustratively, the tool blank of the present application may resemble a "porous material", and the pores forming the pore structure may resemble "holes" in the porous material. It should be noted that this is only for the convenience of understanding the present application, and is not meant to be an explanation of the ratio of the pore structure in the tool blank, the shape configuration of the tool blank, and the shape configuration of the pore structure all must be similar to the analog structure. According to the present application, the shape of the saw tooth structure may be set according to actual needs, and the present application is not limited to the configuration in which the saw tooth structure is formed in a tooth strip shape in the extending direction of the cutting edge of the tool (i.e., the length direction of the tool). The serration structures according to the present application, for example, but not limited to, form a continuous wave-like structure in the extension direction along the cutting edge of the tool (see fig. 3). According to the serration structure of the present application, each serration may have an inverted cone structure in the thickness direction of the cutter. It should be noted that the predetermined hardness and pore structure of the present application may be selected according to practical needs, for example, but not limited to, according to the application of the cutter and the cutting requirement of the cutter (hardness of the object to be cut, etc.).

According to the manufacturing method of the cutter, a cutter blank body with preset hardness and pore mechanism inside is obtained through a sintering process by adopting powder materials, and part of pore structure is exposed outside through polishing of the cutter cutting edge, so that a sawtooth structure is formed at the cutter cutting edge. When the serrated cutting edge structure is impacted on the hard material, the pressure of the tip of the serrated cutting edge structure on the food material is larger, so that the cutting edge part is easier to cut into the food material, and the cutting edge can be permanently sharp. In addition, the serrated cutting edge structure has preset hardness and is stressed and dispersed, so that the phenomenon of 'rolling edge' is not easy to occur.

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

Providing a powder material

The method of manufacturing the tool comprises the step of preparing the powder material. The preparation timing of the powder material is not limited in the present application.

According to the present application, the powder material consists of C, si, cr, ni, mn, mo and Fe. The powder material can be prepared by a vacuum atomization method. Specifically, the method comprises the following steps:

(1) Melting alloy materials containing the elements to obtain molten metal;

(2) And introducing the molten metal into a vacuum atomizing furnace, atomizing the molten metal into liquid drops, and rapidly cooling the liquid drops to obtain the powder material with the required particle size.

In the powder material, C may increase the hardness of the powder material. According to an exemplary embodiment of the present invention, the weight percentage of C may be 0.01% to 0.1%, preferably 0.02% to 0.08%, more preferably 0.05% to 0.07%. If the weight percentage of C is less than 0.01%, the hardness of the powder material is too low, so that the hardness of the tool blank thus produced is also low, whereas if the weight percentage of C is more than 0.1%, the hardness of the powder material is too high, so that the hardness of the tool blank thus produced is too high, resulting in a large brittleness.

In the powder material, si may increase the hardness of the powder material. According to an exemplary embodiment of the present invention, the weight percentage of Si may be 0.05% to 0.8%, preferably 0.1% to 0.6%, more preferably 0.3% to 0.5%. If the weight percentage of Si is less than 0.05%, the hardness of the powder material is too low, so that the hardness of the tool body thus produced is also low, whereas if the weight percentage of Si is more than 0.8%, the hardness of the powder material is too high, so that the hardness of the tool body thus produced is too high, resulting in a large brittleness.

Among the powder materials, cr may make the powder materials have good corrosion resistance and make the powder materials easily form pores upon sintering. According to an exemplary embodiment of the present invention, the Cr may be 15% -17%, preferably 15.3% -16.8%, more preferably 15.5% -16.5% by weight. If the weight percentage of Cr is less than 15%, the corrosion resistance of the powder material is not good, so that the corrosion resistance of the tool body thus produced is also not good, whereas if the weight percentage of Cr is more than 17%, the powder material is not liable to form a pore structure when sintered to form the tool body.

Among the powder materials, ni can make the powder materials have good corrosion resistance and make the powder materials easily form pores upon sintering. According to an exemplary embodiment of the present invention, the weight percentage of Ni may be 0.1% -2%, preferably 0.5% -1.5%, more preferably 1% -1.2%. If the weight percentage of Ni is less than 0.1%, the corrosion resistance of the powder material is not good, so that the corrosion resistance of the tool blank thus manufactured is also not good, and if the weight percentage of Ni is more than 2%, the powder material is not liable to form a pore structure when sintered to form the tool blank.

In powder materials, mn can provide the powder material with good toughness after sintering. According to an exemplary embodiment of the present invention, the weight percentage of Mn may be 0.16% to 0.18%, preferably 0.16% to 0.17% or 0.17% to 0.18%. If the weight percentage of Mn is less than 0.16%, toughness of the powder material is too low, so that toughness of a tool body formed by sintering the powder material is poor, and if the weight percentage of Mn is more than 0.18%, brittleness of the powder material is increased, so that a fracture phenomenon of the tool body formed by sintering the powder material is liable to occur.

In powder materials, mo may provide the powder material with good toughness after sintering. According to an exemplary embodiment of the present invention, the weight percentage of Mo may be 1.4% -2%, preferably 1.5% -1.9%, more preferably 1.6% -1.8%. If the weight percentage of Mo is less than 1.4%, toughness of the powder material is too low, so that toughness of a tool body formed by sintering the powder material is also poor, whereas if the weight percentage of Mo is more than 2%, brittleness of the powder material is increased, so that a tool body formed by sintering the powder material is liable to be broken.

In the powder material, fe acts as a main component of the powder material, and thus has a function of reducing cost and the like.

According to the present application, although the roles of part of the elements of the respective constituent elements are the same, they are indispensable. For example, cr and Ni are used as examples, a large amount of Cr increases pores, but if Cr is small, corrosion resistance is not required, and thus Ni is required to be added, and a small amount of Ni can provide excellent corrosion resistance (for example, corrosion resistance of 1gNi corresponds to 10g of Cr, but if Ni material is provided alone, cost increases). Mn and Mo are set up the rule and similar to the setting up rule of Cr and Ni above, therefore various constituent elements of this application are indispensable, the coaction makes the cutter blank formed by sintering the powder material obtain better effects.

According to the method, the cutter blank is formed by adopting the powder material comprising a plurality of elements such as C, si, cr, ni, mn, mo and Fe and the like through a sintering process, and the cutter blank can have preset hardness (namely, strength is equivalent to that), so that the edge rolling is not easy to occur, and the service life is prolonged. The powder material according to the present application may have a predetermined hardness of HRC40-HRC55. When the hardness is lower than HRC40, the initial sharpness or lasting sharpness of the cutter is lower, when the hardness is higher than HRC55, the brittleness of the material is higher, and the problem of tipping (namely, chipping of the cutting edge of the cutter) easily occurs during cutting.

The particle size of the powder material affects the pore structure and affects the overall strength (hardness) of the formed tool blank. If the particle size is too large, the formed pore structure is too large, and the whole structure of the cutter blank is loose, so that the strength of the cutter blank is insufficient; if the particle diameter is too small, a proper saw tooth structure cannot be obtained in the subsequent sharpening step, which affects the initial sharpness and the durable sharpness. Thus, in the step of preparing the powder material, a step of selecting the particle size of the powder is further included. In embodiments, the powder material may have an average particle size of 10 μm to 50 μm, with larger particle sizes resulting in larger pore sizes but fewer pores in the tool body; the smaller the particle size, the opposite is true. Here, the particle size difference of the powder material can be made small (relatively uniform), so that the parts in the tool blank form a uniform structure. The particle size of the above-mentioned material may be the maximum length of each material particle, and the material is not particularly limited to have a spherical or spheroid shape. For example, but not limited to, when a material has an oval shape, the particle size dimension of the material may refer to the length of its major axis.

Preparing a cutter blank

In order to obtain a tool blank having a predetermined hardness and a predetermined pore structure, according to the present application, after the powder material is prepared, the tool blank is formed by a sintering process using the powder material. Compared with the powder metallurgy technology (powder metallurgy usually comprises a step of smelting powder, so that a cutter with pores cannot be obtained), the sintering process is adopted, powder materials are not completely melted, and the pore structure inside a cutter blank and the hardness of the cutter can be controlled. According to the present application, the pore structure comprises a suitable pore size and number of pores, and the pores are uniformly dispersed in the tool blank so that a suitable saw tooth structure can be formed at sharpening.

According to the present application, forming a tool blank having a predetermined hardness and having a pore structure therein by a sintering process using a powder material may include the following steps.

Step S101, preparing a slurry including the powder material, the powder material having a preset particle size.

In embodiments of the present application, the step of preparing a slurry may include mixing the powder material, the dispersant, the binder, and the water components to form a slurry.

In an exemplary embodiment, the dispersing agent may include sodium alginate and the binder may include gelatin. Of course, examples of dispersants and binders are not limited thereto, and other dispersants and/or binders may be selected by those skilled in the art in light of the teachings of the present application. Specifically, the above raw materials can be proportioned according to weight ratio, and then mixed to prepare slurry, wherein the slurry comprises 50% -65% of powder material, 0.3% -0.5% of dispersing agent, 0.4% -0.6% of binder and the balance of water according to weight percentage.

In an exemplary embodiment, the predetermined particle size may be determined according to actual needs, such as, but not limited to, the application of the cutter and the cutting requirements of the cutter. The predetermined particle size is, for example, 10 μm to 50 μm.

Step S102, forming the slurry into an initial blank body through a die.

In the embodiment of the application, the slurry can be made into an initial blank by adopting a mode of die forming in the prior art. In an embodiment, an injection molding mode may be adopted, specifically, the prepared slurry is slowly injected into a cutter mold, cooled in air for solidification for a preset time, and taken out after the slurry has a certain strength, so as to obtain an initial blank. The preset time may be specifically set according to the thickness, width, etc. of the initial blank, and may be, for example, 12h to 24h, 24h to 36h, or 36h to 48h. According to the present application, an initial blank (i.e. an initial model of the tool) of a corresponding shape and thickness is obtained by adjusting the corresponding mould. The shape of the initial blank may be the shape of various kitchen knives in the prior art. The thickness of the initial blank may be selected according to practical situations, and may be, for example, 1mm to 3.5mm.

And step S103, adjusting parameters of the sintering process, and sintering the initial blank to obtain the cutter blank with preset hardness and pore structure inside.

In the embodiment of the present application, if oxygen exists in the sintering environment of the powder material, the initial green body is easily oxidized at high temperature, so that the performance of the manufactured cutter green body is affected, and therefore, in some embodiments, the step of sintering the initial green body may include: and placing the initial blank body in a vacuum environment, and then sintering the initial blank body in a stepped heating mode. In an exemplary embodiment, the initial green body is placed in an inner cavity of a sintering device, the inner cavity of the sintering device is vacuumized until the vacuum degree is a preset value, and then sintering treatment can be performed on the initial green body in a stepped temperature rising mode. The predetermined value of the vacuum degree may be set according to the actual situation, and may be 2.4X10 ^-3 Pa。

Fig. 4 is a sintering graph according to an embodiment of the present application. As shown in fig. 4, the initial green body is subjected to sintering treatment by adopting a step-wise heating manner. Specifically, the step of sintering the initial blank by adopting a step heating mode comprises the following steps: heating the initial blank to an initial temperature, heating to 650-750 ℃ at a heating rate of 4-6 ℃/min, preserving heat for 20-40 min, heating to 1100-1300 ℃ at a heating rate of 4-6 ℃/min, preserving heat for 10-50 min, and cooling to room temperature at a cooling rate of 4-6 ℃/min. The initial temperature may be set according to practical situations, so that the initial blank body can be primarily cured, and the initial temperature may be 430-480 ℃ for example.

In these embodiments, when the initial green body is heated to 430 ℃ to 480 ℃ (first step), the initial green body is initially solidified, at which time the dispersing agent is gradually volatilized during the temperature rise, and then heated to 650 ℃ to 750 ℃ at a temperature rise rate of 4 ℃ to 6 ℃/min (second step), the solidified initial green body is gradually preformed, adjacent particles of the powder material are bonded to each other by the binder, and then continuously heated to 1100 ℃ to 1300 ℃ at a temperature rise rate of 4 ℃ to 6 ℃/min (third step), the binder is gradually volatilized, and adjacent particles of the powder material are metallurgically bonded to each other and can form the cutter green body having a predetermined pore structure inside. And then, cooling the initial blank to room temperature at a preset cooling speed, and taking out.

According to the application, in order to further improve the strength of the formed tool blank, the final stage of stepwise heating may include a stage of relaxation treatment, i.e. in a temperature interval where the final stage is located, the treatment may be performed in an alternating manner of heating and cooling, as shown in fig. 4. In general, if the pore size is larger, the strength of the cutter blank is lower, but the adjacent particles of the powder materials can have better binding force when being combined in a cold-hot alternating mode, so that the finally achieved effect is that the cutter blank after sintering can be ensured to have proper pore size on the premise of not reducing the metallurgical binding force among the particles of the powder materials, and the processing mode can bring more durable sharpness under the same hardness condition.

Specifically, the last stage of the stepwise heating comprises a stage of sintering by adopting a cold-hot alternating heating mode in the temperature range of the last heating stage. Continuing with the above example, in the last heating stage, after heating to 1200-1300 ℃, cooling at a cooling rate of 4-6deg.C/min for 3-5 seconds, and heating at a heating rate of 4-6deg.C/min for 3-5 seconds, and continuously and alternately carrying out 3-5 times.

According to the present application, the tool blank formed by sintering a powder material has not only a predetermined hardness but also a pore mechanism inside thereof. Wherein the pore structure comprises a predetermined pore size and number of pores. The number of pores is determined by the particle size of the powder material and the parameters of the sintering process, the particle size of the powder material determines the number of powder in a unit area, the number of powder determines the number of pores in the powder material after the powder material is integrated, the sintering process is controlled to enable metallurgical bonding to be carried out among the particles of the powder material, and finally the number of pores in the sintered cutter blank is determined. According to the present application, the parameters of the sintering process and/or the particle size of the powder material are adjusted such that the pore structure comprises a predetermined pore size and number of pores and such that the tool blank has said predetermined hardness.

After the cutter blank is obtained, the applicant also cuts the cutter blank along all directions, and microscopic observation and analysis are carried out on the section of the cutter blank, so that the cutter blank prepared according to the application has dense convex structures on the outer surface of the cutter blank no matter which direction the section is carried out along, and the pores inside the cutter blank are dense, uniform and have a certain depth. In embodiments, the pore size is on the order of microns, and may be, for example, 3 μm to 12 μm, with 100 to 600 pores per square centimeter of tool blank.

Fig. 1 is a schematic view, microscopically enlarged, of a cross-section of a tool blank formed from a powder material according to an embodiment of the present application. As shown in fig. 1, a part of the pore structure of the part of the tool blank that is located inside the tool blank and communicates with the outside can be seen.

Sharpening the cutting edge of the cutter blank

In an embodiment, the step of sharpening the cutting edge of the tool blank to expose a portion of the pore structure and form a saw tooth structure at the cutting edge of the tool comprises: the depth of the sharpening process is adjusted to change the height of the saw tooth structure, which is 1 μm to 6 μm. Specifically, the cutter blank is ground into a cutter with a required specification or shape through a conventional grinding process, and then the cutter is subjected to sharpening treatment, and due to the pore structure in the cutter blank, the pore mechanism at the position of the cutting edge is partially exposed, so that a sawtooth structure is formed together with particles of powder material forming the cutter blank. In an exemplary embodiment, the depth of sharpening the tool blank may be adjusted such that the saw tooth structure has a predetermined height; wherein the predetermined height is in the order of micrometers, and may be 1 μm to 6 μm, and the peak pitch of the saw tooth structure is the pore size of the pore structure, and may be 3 μm to 12 μm.

According to a second aspect of the present application, a tool is provided. The cutter is manufactured by adopting the manufacturing method of the cutter in each embodiment, so that the cutter has all the beneficial effects in each embodiment and is not repeated herein. Or the tool may be obtained in other ways such as, but not limited to, using a powder material and by 3D printing.

In an embodiment of the present application, the tool comprises a tool blank having a predetermined hardness and having a pore structure therein. Wherein, the cutter blank is formed by adopting powder material through a powder sintering process; the cutting edge of the cutter is provided with a saw tooth structure, the saw tooth structure is obtained by sharpening a cutter blank, and the powder material consists of C, si, cr, ni, mn, mo and Fe.

In an embodiment, the pore structure comprises a predetermined pore size and a number of pores, the pore size being 3 μm to 12 μm, the number of pores being 100 to 600 pores per square centimeter of the tool blank; the average particle size of the powder material is 10 μm-50 μm; the hardness of the cutter blank body is HRC40-HRC55.

Fig. 2 is a schematic structural view of a tool according to an embodiment of the present application. Fig. 3 is an enlarged schematic view at I in fig. 2 according to the present application. As shown in fig. 2 and 3, the cutting edge of the cutter is formed in a zigzag structure along the length direction.

The method of manufacturing a tool and the tool of the inventive concept are described in detail above 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

The tool according to example 1 was prepared by the following method.

Step S10, providing a powder material. Wherein the particle size of the powder material is 30-40 μm, and the powder material comprises the following components in percentage by weight: 0.05%, si:0.4%, cr:16%, ni:1%, mn:0.17%, mo:1.7% and the balance Fe.

And S20, preparing a cutter blank. Specifically, the method comprises the following steps.

Step S21, preparing a slurry including a powder material. Specifically, the slurry comprises 58% of powder material, 0.4% of sodium alginate, 0.5% of gelatin and the balance of water in percentage by weight, the components are weighed according to the corresponding proportion, and the components are fully mixed to form the slurry.

Step S22, the slurry is molded into an initial blank body through a mold. Specifically, the prepared slurry was slowly injected into a mold by means of injection molding, and cooled and solidified in air for 24 hours, thereby obtaining an initial green body having a thickness of 3.2 mm.

And step S30, sintering the initial blank. Specifically, the method comprises the following steps.

Step S31, placing the initial blank in the inner cavity of the sintering equipment, and vacuumizing the inner cavity of the sintering equipment to a vacuum degree of 2.4X10 ^-3 Pa。

And S32, starting the sintering equipment, setting the temperature to 450 ℃, heating the initial blank to 450 ℃ (first stage), heating to 700 ℃ at the heating rate of 5 ℃/min (second stage), preserving heat for 30min, heating to 1200 ℃ at the heating rate of 5 ℃/min (third stage), and preserving heat for 30min. Subsequently, the initial blank was cooled to room temperature at a cooling rate of 5 ℃ per minute, thereby obtaining a cutter blank having a thickness of 3 mm. The cutter blank is cut open, and the microscopic measurement shows that the pores of the section of the initial blank are uniformly distributed, the single pore size of the outer layer of the initial blank is in the range of 5-8 mu m, and the number of the pores on the cutter blank per square centimeter is about 332-340.

And S40, grinding the cutter blank into a cutter with a required specification or shape through a conventional grinding process, and sharpening the cutter to form a saw-tooth structure, wherein the peak pitch of the saw-tooth structure is in the range of 6-8 mu m, and the peak height is 2-4 mu m.

Example 2

The cutter of example 2 was manufactured by the same method as in example 1 except that in step S32, the sintering process parameters were different from those of example 1 (the sintering equipment was turned on, the temperature was set to 450 ℃, the initial green body was heated to 450 ℃, the temperature was further raised to 650 ℃ at a temperature raising rate of 5 ℃/min, the temperature was maintained for 20min, the temperature was then raised to 1100 ℃ at a temperature raising rate of 5 ℃/min, and the temperature was maintained for 10min, and then the cooling rate of 5 ℃/min of the initial green body was cooled to room temperature, whereby the cutter green body was obtained.

Example 3

The cutter of example 3 was manufactured by the same method as in example 1 except that in step S32, the sintering process parameters were different from those of example 1 (the sintering equipment was turned on, the temperature was set to 450 ℃, the initial green body was heated to 450 ℃, the temperature was further raised to 750 ℃ at a temperature raising rate of 5 ℃/min, the temperature was maintained for 40min, the temperature was then raised to 1300 ℃ at a temperature raising rate of 5 ℃/min, and the initial green body was cooled to room temperature at a cooling rate of 5 ℃/min, and the cutter green body was taken out, whereby the cutter green body was cut, the distribution of pores in the cross section of the cutter green body was uniform and the outer pore size thereof was in the range of 4 μm to 7 μm as measured by a microscope, and the number of pores per square centimeter on the cutter green body was about 351 to 360).

Example 4

Except that the sintering process parameters were different from those of example 1 in step S32, (unlike example 1, in the third stage, after the temperature was raised to 1200 c, the temperature was lowered at a temperature lowering rate of 5 c/min and maintained for 4 seconds, then the temperature was raised and maintained at a temperature raising rate of 5 c/min for 4 seconds, and the temperature was continuously raised and lowered alternately for 3 times, then the temperature was raised to 1200 c at a temperature raising rate of 5 c/min, and kept for 30 minutes, and then the initial green body was cooled to room temperature at a cooling rate of 5 c/min, whereby the cutter body of example 4 was obtained.

Comparative example 1

The powder material of the present application was formed into a cutter having a thickness of 3mm by powder metallurgy as the cutter of comparative example 1.

Comparative example 2

A commercially available martensitic stainless steel cutter with a thickness of 3 mm.

Performance index test

The thicknesses of the cutting edges in examples 1 to 4 and comparative examples 1 to 2 were the same, and performance index tests were performed on each of them, and the test results are recorded in table 1 below. The performance test method comprises the following steps:

(1) Hardness of the cutter: the hardness of the cutter is tested by referring to the 6.2.9 Rockwell hardness test method in GBT 40356-2021 kitchen cutter;

(2) Initial sharpness: reference is made to the sharpness test method in GBT 40356-2021 kitchen knife. The greater the value of sharpness, the better the initial sharpness and the smaller the value of sharpness, and vice versa.

(3) The durable sharpness testing method comprises the following steps:

the longer the initial sharpness and the long-lasting sharpness life, the smaller the value of the lasting sharpness, and vice versa.

The test method for simulating the service life of the cutter comprises the following steps: the cutting edge of the tested cutter is fixed on the cutter fixing device downwards and horizontally, and after the weight is added, the cutter is pressed on a simulated object under the pressure of 16N. Cutting simulant

The simulated ham sausage skin is kept static, the cutter is driven to cut towards the X-axis direction by a motor and an air pressure driving cutter fixing device, the speed is 50mm/s, the cutter is lifted in the Z-axis direction and moves towards the Y-axis direction by 1mm, the simulated ham sausage skin is cut, the cutting stroke is 100mm, the cutting is finished after 5 times of cutting the simulated ham sausage skin, and the lasting sharpness of the cutter is judged by adopting an evaluation object. And (3) stopping the test until the evaluation object is not cut, and recording the total cutting times from the start to the stop of the test, namely, the lasting sharpness of the cutter, wherein the longer the total cutting times are, the higher the lasting sharpness is.

Table 1 performance test data for the examples and comparative examples of the present application

In summary, the cutter manufactured according to the application can be permanently sharp, and the edge rolling phenomenon is not easy to occur.

Although embodiments of the present application have been described in detail hereinabove, various modifications and variations may be made to the embodiments of the present application by those skilled in the art without departing from the spirit and scope of the present application. It will be appreciated that such modifications and variations will still fall within the spirit and scope of the embodiments of the present application as defined by the appended claims, as will occur to those skilled in the art.

Claims

1. A method of manufacturing a tool, comprising the steps of:

forming a cutter blank with preset hardness and a pore structure inside by adopting a powder material through a sintering process;

sharpening the cutting edge of the cutter blank to expose part of pore structures and form a sawtooth structure at the cutting edge of the cutter;

wherein the powder material comprises the constituent elements of C, si, cr, ni, mn, mo and Fe, and comprises, by weight, 0.01% -0.1% of C, 0.05% -0.8% of Si, 15% -17% of Cr, 0.1% -2% of Ni, 0.16% -0.18% of Mn, 1.4% -2% of Mo and the balance of Fe.

2. The method of manufacturing a tool according to claim 1, wherein the powder material has a preset particle size of 10 μm to 50 μm.

3. The method of manufacturing a tool according to claim 1, wherein the step of forming a tool blank comprises:

preparing a slurry comprising the powder material;

forming the slurry into an initial blank body through a die;

sintering the initial blank, wherein the cutter blank with preset hardness and pore structure inside is obtained by adjusting parameters of the sintering process.

4. A method of manufacturing a tool according to claim 3, wherein the pore structure comprises a predetermined pore size of 3 μm to 12 μm and a number of pores of 100 to 600 pores per square centimeter of tool blank; the predetermined hardness of the cutter blank body is HRC40-HRC55.

5. A method of manufacturing a tool according to claim 3, wherein the step of sintering the initial blank comprises:

and placing the initial blank body in a vacuum environment, and then sintering the initial blank body in a stepped heating mode.

6. The method of manufacturing a tool according to claim 5, wherein the step of sintering the initial green body with a stepwise elevated temperature comprises: heating the initial blank to 430-480 ℃, heating to 650-750 ℃ at a heating rate of 4-6 ℃/min, preserving heat for 20-40 min, heating to 1100-1300 ℃ at a heating rate of 4-6 ℃/min, preserving heat for 10-50 min, and cooling to room temperature at a cooling rate of 4-6 ℃/min.

7. A method of manufacturing a tool according to claim 3, wherein the step of preparing a slurry comprising the powder material comprises: mixing a powder material, a dispersant, a binder, and water to form the slurry, wherein the slurry comprises, in weight percent, 50% -65% of the powder material, 0.3% -0.5% of the dispersant, 0.4% -0.6% of the binder, and the balance water.

8. The method of manufacturing a tool according to claim 1, wherein the step of sharpening the cutting edge of the tool blank comprises:

adjusting the depth of the sharpening process of the cutter blank body so that the sawtooth structure has a preset height,

wherein the predetermined height is 1 μm to 6 μm.

9. A tool, characterized in that the tool comprises a tool body having a predetermined hardness and having a pore structure inside, the tool body being formed by a powder sintering process using a powder material; the cutting edge of the cutter is provided with a saw tooth structure, the saw tooth structure is obtained by sharpening the cutter blank, the powder material comprises C, si, cr, ni, mn, mo and Fe, and comprises, by weight, 0.01% -0.1% of C, 0.05% -0.8% of Si, 15% -17% of Cr, 0.1% -2% of Ni, 0.16% -0.18% of Mn, 1.4% -2% of Mo and the balance of Fe.

10. The tool according to claim 9, wherein the powder material has an average particle size of 10 μm to 50 μm; the hardness of the cutter blank body is HRC40-HRC55.

11. The tool of claim 9 wherein the pore structure comprises a predetermined pore size and a number of pores, the pore size being 3 μm to 12 μm and the number of pores being 100 to 600 per square centimeter of tool blank.