Micro-tool blank and micro-tool manufacturing method

Abstract

The application is suitable for the technical field of micro-cutter, and provides a micro-cutter blank and a micro-cutter preparation method.The micro-cutter blank comprises a multilayer foil structure, the foil structure comprises two cutter body parts and a connecting part between the two cutter body parts, and the plurality of foil structures are arranged in a stacking manner along the thickness direction of the micro-cutter blank.The micro-cutter blank provided by the application effectively improves the overall bearing capacity of the micro-cutter blank by arranging the foil structures in a stacking manner along the thickness direction of the micro-cutter blank, so that each foil structure can protect each other, share the energy generated in the machining process, and maximally reduce the problem of micro-cutter blank fracture caused by unstable factors such as tool and blank vibration and current fluctuation, thereby effectively preparing a batch of micro-cutters with very small diameters, effectively improving the production efficiency, and reducing the production cost.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of micro-cutters, and more particularly relates to a micro-cutter blank and a micro-cutter preparation method. BACKGROUND

[0002] Micro-cutting is a fast and low-cost micro-part machining method. With the diversified development of micro-electromechanical systems and micromachines, the demand for micro-components with different mechanical properties and electronic characteristics is becoming more and more urgent. Micro-electromechanical system technology has become one of the fastest growing industries in the world. Industries that need to manufacture extremely small high-precision parts, such as biology, medical equipment, optics, and microelectronics, have a large demand. However, not every micro-component used in micro-electromechanical systems or micromachines can be produced using integrated circuit technology. Therefore, new materials and new micro-manufacturing technologies and micro-cutting technologies have been developed. The cutting depth and feed of micro-cutting are very small, so the cutting force per unit cutting area is large, and a lot of heat is generated, causing the temperature of the local area of the cutting edge tip to rise. Therefore, the performance requirements of the tool material for micro-cutting are high, and a tool material that is wear-resistant, heat-resistant, high in high-temperature hardness and high-temperature strength is required. With the miniaturization of the minimum diameter of rotation, the bending strength, rigidity, and fracture toughness of the rotary cutter should be high. In addition to the tool material, the geometry of the tool is crucial to achieving micro-cutting machining. Under micro-cutting conditions, precise removal of extremely thin material requires extremely sharp cutting edges, that is, extremely small edge radii. Moreover, the sharpness of the edge is related to the cutting surface quality, microstructure morphology, and crystal lattice dislocation. Accurate measurement of the tool edge profile is the prerequisite for ensuring tool edge grinding and quality analysis during the micro-cutting process. At present, most micro-cutters are machined using grinding and electrical discharge machining processes. After the diameter of the micro-cutter is machined to a sufficiently small size, the micro-cutter is processed with a chip removal groove and sharpened.

[0003] However, when machining the working part of a micro-cutter with a diameter of less than 80 microns by grinding or electrical discharge machining, the micro-cutter is prone to breakage due to the inevitable influence of unstable factors as the diameter decreases, and the yield of machined micro-cutters decreases sharply, making it impossible to produce in normal batches. SUMMARY

[0004] The purpose of the embodiments of the present application is to provide a micro-cutter blank and a micro-cutter preparation method, which aims to solve the technical problem that the micro-cutter with a very small diameter is prone to breakage when machined by grinding or electrical discharge machining, and cannot be produced in normal batches.

[0005] To achieve the above object, according to one aspect of the present application, a micro-tool blank is provided, the micro-tool blank comprising a plurality of foil structures, each foil structure comprising two tool body portions and a connecting portion between the two tool body portions, the plurality of foil structures being stacked along a thickness direction of the micro-tool blank.

[0006] Optionally, each foil structure comprises two tool tips, each tool tip being arranged on one of the two tool body portions, and the two tool tips on the same foil structure being connected to form the connecting portion.

[0007] Optionally, the foil structure is made of tungsten, and the thickness of the foil structure is 5-60 μm.

[0008] Optionally, the cross section of the tool tip perpendicular to the length direction of the micro-tool blank is square, so as to form four natural chip flutes on the side of the tool tip.

[0009] Optionally, a spiral groove is arranged on the outer periphery of the tool tip and spirals along the length direction of the tool tip.

[0010] Optionally, the spiral groove is a plurality of spiral grooves, and the plurality of spiral grooves are parallel.

[0011] Optionally, the thickness of the foil structure is 50 μm.

[0012] Optionally, the micro-tool blank further comprises a plurality of adhesive layers, each adhesive layer being arranged between two adjacent foil structures.

[0013] Optionally, the adhesive layer is a water-soluble glue layer.

[0014] According to another aspect of the present application, a micro-tool manufacturing method is provided, the micro-tool manufacturing method comprising: stacking N foil blanks to form a foil combination; clamping and fixing the foil combination; grinding or cutting the foil combination to form the micro-tool blank; cutting the middle of the connecting portion of the micro-tool blank to form 2*N micro-tool units; and sharpening the micro-tool units to obtain the micro-tool.

[0015] The micro cutter blank provided by the application has the beneficial effects that, compared with the prior art, when the micro cutter blank provided by the application is used to manufacture a micro cutter with a very small diameter, the micro cutter blank provided by the application needs to be clamped first, after the clamping of the micro cutter blank provided by the application is completed, the connecting portions on the plurality of foil structures are symmetrically cut along the thickness direction of the micro cutter blank provided by the application, thereby effectively symmetrically dividing the micro cutter blank provided by the application, after the symmetric division of the micro cutter blank provided by the application is completed, the symmetrically divided micro cutter blank provided by the application can be detached from the clamp, and the separated foil structures after the division are separated, after the separated foil structures after the division are completely separated, the end face of the connecting portion of each foil structure after the division is separately sharpened, and a plurality of micro cutters are obtained after the sharpening is completed, the micro cutter blank provided by the application is stacked in the thickness direction of the micro cutter blank by the foil structure, the overall bearing capacity of the micro cutter blank is effectively improved, the foil structures can protect each other, share the energy generated in the machining process, and the problem of the fracture of the micro cutter blank caused by unstable factors such as tool and blank vibration and current fluctuation is maximally reduced, thereby effectively manufacturing a plurality of micro cutters with a very small diameter, effectively improving the production efficiency, and reducing the production cost. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 The structure schematic diagram of the micro cutter blank provided by the embodiments of the application is shown in the figure.

[0018] Figure 2 The structure schematic diagram of the foil structure provided by the embodiments of the application is shown in the figure.

[0019] Figure 3 The structure schematic diagram of the micro cutter blank after cutting provided by the embodiments of the application is shown in the figure.

[0020] Figure 4 The structure schematic diagram of the foil structure after cutting provided by the embodiments of the application is shown in the figure.

[0021] Figure 5 The structure schematic diagram of the cutter head section provided by the embodiments of the application is shown in the figure.

[0022] Figure 6A flow chart of a micro-cutter manufacturing method is provided for the embodiments of the present application.

[0023] The reference numerals involved in the above-described drawings are listed as follows:

[0024] 10, foil structure;

[0025] 11, cutter main body part;

[0026] 12, connecting part;

[0027] 13, cutter head;

[0028] 14, sharpening end face;

[0029] 15, chip flute. DETAILED DESCRIPTION

[0030] In order to make the technical problems to be solved, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.

[0031] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. The embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0032] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0033] In addition, the terms "first", "second" are only used for description purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0034] As described in the background art, at present, micro-cutting is a fast and low-cost micro-part machining method, with the diversified development of micro-electromechanical systems and micro-machines, the demand for micro-components with different mechanical properties and electronic characteristics is becoming more and more urgent, micro-electromechanical system technology has become one of the fastest growing industries in the world, and industries that need to manufacture extremely small high-precision parts, such as biology, medical equipment, optics, and microelectronics, have a large demand; However, not every micro-component used in micro-electromechanical systems or micro-machines can be produced by integrated circuit technology, so new materials and new micro-manufacturing technologies and micro-cutting technologies have been developed; The cutting depth and feed of micro-cutting are very small, so the cutting force per unit cutting area is large, and a lot of heat is generated, which raises the temperature in the local area of the cutting edge tip, so the performance requirements of the tool material for micro-cutting are higher, and wear-resistant, heat-resistant, high-temperature hardness, high-temperature strength good tool materials are required, with the miniaturization of the minimum diameter of rotation, the bending strength, rigidity and fracture toughness of the rotary tool should be higher; In addition to the tool material, the geometry of the tool is crucial to achieving micro-cutting machining; Under the condition of micro-cutting, precise removal of extremely thin material requires extremely sharp cutting edges, that is, extremely small edge radii, not only that, the sharpness of the edge also relates to the cutting surface quality, microstructure morphology and crystal lattice dislocation, accurate measurement of the tool edge profile is the premise of ensuring tool edge grinding and micro-cutting process quality analysis. At present, most of the machining of micro-tools adopts grinding and electrical discharge machining processes to process the diameter of the micro-tool to a small enough size, and then the micro-tool is processed with a chip removal groove and sharpened. However, when machining the working part of the micro-tool with a diameter of less than 80 μm by grinding or electrical discharge machining, as the diameter decreases, due to the inevitable influence of unstable factors, the micro-tool is prone to breakage, the yield of micro-tool machining is sharply reduced, and normal batch production cannot be carried out.

[0035] See Figures 1 to 5As shown, in order to solve the above problems, according to one aspect of the present application, the embodiment of the present application provides a micro-tool blank, the micro-tool blank comprises a plurality of foil structures 10, the foil structure 10 comprises two tool body parts 11 and a connecting part 12 between the two tool body parts 11, and the plurality of foil structures 10 are stacked in the thickness direction of the micro-tool blank. When using the micro-tool blank provided by the embodiment to prepare a micro-tool with a diameter of less than 80 μm, first, the micro-tool blank provided by the embodiment needs to be clamped, and after the clamping of the micro-tool blank provided by the embodiment is completed, the connecting part 12 on the plurality of foil structures 10 can be symmetrically cut along the thickness direction of the micro-tool blank provided by the embodiment, thereby effectively symmetrically dividing the micro-tool blank provided by the embodiment. After the micro-tool blank provided by the embodiment is symmetrically divided, the symmetrically divided micro-tool blank provided by the embodiment can be removed from the clamp, and the stacked and divided foil structures 10 are separated, and after the stacked and divided foil structures 10 are completely separated, the end face of the connecting part 12 of each divided foil structure 10 can be sharpened separately, and after the sharpening is completed, a plurality of micro-tools can be obtained. The micro-tool blank provided by the embodiment stacks the foil structure 10 in the thickness direction of the micro-tool blank, effectively improves the overall bearing capacity of the micro-tool blank, enables each foil structure 10 to protect each other, shares the energy generated during processing, maximizes the problem of micro-tool blank fracture caused by unstable factors such as tool and blank vibration and current fluctuation, thereby effectively preparing a batch of micro-tools with a diameter of less than 80 μm, effectively improving the production efficiency and reducing the production cost.

[0036] Referring to Figures 1 to 5As shown, the foil structure 10 in the embodiment includes two tool heads 13, which are arranged on the two tool body parts 11 respectively, and the two tool heads 13 on the same foil structure 10 are connected to form a connecting part 12. When the micro tool blank provided by the embodiment is used to manufacture micro tools with a diameter of less than 80 μm, the micro tool blank provided by the embodiment needs to be clamped first. After the clamping of the micro tool blank provided by the embodiment is completed, the connecting parts 12 on the plurality of foil structures 10 are symmetrically cut along the thickness direction of the micro tool blank, so that the two tool heads 13 on the connecting part 12 are separated. After the two tool heads 13 on each foil structure 10 are completely separated, the symmetrically cut micro tool blank provided by the embodiment can be removed from the clamp, and the separated foil structures 10 arranged in layers are separated. After the foil structures 10 arranged in layers are completely separated, the end faces of the tool heads 13 on each separated foil structure 10 are sharpened. After the tool heads 13 are sharpened, a plurality of micro tools are obtained. The micro tool blank provided by the embodiment is arranged in layers along the thickness direction of the micro tool blank, which effectively improves the overall bearing capacity of the micro tool blank, protects each foil structure 10, and reduces the problem of micro tool blank fracture caused by unstable factors such as tool and blank vibration and current fluctuation. Therefore, the micro tools with a diameter of less than 80 μm can be effectively manufactured in batches, the production efficiency is effectively improved, and the production cost is reduced.

[0037] In order to effectively ensure the strength of the micro tool blank and the working performance of the micro tool provided by the embodiment, the foil structure 10 in the embodiment is made of tungsten, and the thickness of the foil structure 10 is 5-60 μm. By setting the material of the foil structure 10 provided by the embodiment as tungsten and the thickness of the foil structure 10 as 5-60 μm, the micro tool machined by the micro tool blank provided by the embodiment has certain working performance under the premise of effectively ensuring the strength of the micro tool blank.

[0038] Referring to Figure 5 As shown, in order to enable the micro tool machined by the micro tool blank provided by the embodiment to effectively perform drilling operation, the cross section of the tool head 13 perpendicular to the length direction of the micro tool blank is square, so as to form four natural chip flutes 15 on the side of the tool head 13. By setting the cross section of the tool head 13 perpendicular to the length direction of the micro tool blank as square, four natural chip flutes 15 can be formed on the side of the tool head 13, so that the micro tool machined by the micro tool blank provided by the embodiment can effectively perform drilling operation.

[0039] In order to effectively improve the chip removal effect of the micro-cutter processed by the micro-cutter blank provided by the embodiment during drilling operation, the outer periphery of the tool bit 13 is provided with a spiral groove winding along the length direction of the tool bit 13. By providing the spiral groove winding along the length direction of the tool bit 13 on the outer periphery of the tool bit 13, the chip removal effect of the micro-cutter processed by the micro-cutter blank provided by the embodiment during drilling operation can be effectively improved.

[0040] In order to further improve the chip removal effect of the micro-cutter processed by the micro-cutter blank provided by the embodiment during drilling operation, the spiral groove in the embodiment is multiple, and the multiple spiral grooves are parallel. By providing multiple spiral grooves and arranging the multiple spiral grooves in parallel, the chip removal effect of the micro-cutter processed by the micro-cutter blank provided by the embodiment during drilling operation can be effectively improved.

[0041] In a preferred embodiment, the spiral angle of the spiral groove in the embodiment is 18°-38°

[0042] In a preferred embodiment, the thickness of the foil structure 10 in the embodiment is 50μm.

[0043] In order to effectively stack and fix multiple foil structures 10, the micro-cutter blank in the embodiment further comprises multiple adhesive layers, and the multiple adhesive layers are respectively arranged between adjacent two foil structures 10. By arranging multiple adhesive layers and arranging the multiple adhesive layers between adjacent two foil structures 10, multiple foil structures 10 can be effectively stacked and fixed, thereby effectively improving the overall bearing capacity of the micro-cutter blank, enabling each foil structure 10 to protect each other, sharing the energy generated during the machining process, and minimizing the problem of micro-cutter blank fracture caused by unstable factors such as tool and blank vibration, current fluctuation, etc., thereby effectively preparing micro-cutters with a diameter of 80μm or less in batches, effectively improving the production efficiency, and reducing the production cost.

[0044] In order to effectively stack and fix the plurality of foil structures 10, the adhesive layer in the embodiment is a water-soluble glue layer. By setting the adhesive layer as a water-soluble glue layer, the plurality of foil structures 10 can be effectively stacked and fixed, thereby effectively improving the overall bearing capacity of the micro-cutter blank, allowing each foil structure 10 to protect each other, share the energy generated during processing, and minimize the problem of micro-cutter blank fracture caused by unstable factors such as tool and blank vibration and current fluctuation. Therefore, the micro-cutter with a diameter of less than 80 μm can be effectively prepared in batches, the production efficiency is effectively improved, and the production cost is reduced. After the micro-cutter blank provided in the embodiment is processed, the processed micro-cutter blank is placed in water at 20-100°C, the water-soluble glue layer between the two adjacent foil structures is dissolved in water, and the plurality of foil structures are effectively separated.

[0045] In a specific embodiment, the cross-sectional shape of the tool bit 13 in the embodiment is a square, the side length of the square is a, and the diagonal length is b. The equivalent diameter of the micro-cutter processed by the micro-cutter blank provided in the embodiment is b, the key dimension of the chip flute 15 is (b-a) / 2, and the end face of the tool bit 13 is the sharpened end face 14.

[0046] Referring to Figure 6 According to another aspect of the present application, a micro-cutter preparation method is provided, which includes: S101, placing an N-layer foil blank stack to form a foil combination; S103, clamping and fixing the foil combination; S105, grinding or cutting the foil combination to form the above-mentioned micro-cutter blank; S107, cutting the middle of the connecting portion 12 of the micro-cutter blank to form 2*N micro-cutter units; and S109, sharpening the micro-cutter units to obtain the micro-cutter.

[0047] In a specific embodiment, when the micro cutter provided in the embodiment is prepared, first, the foil blank stack of N layers provided in the embodiment is placed to form a foil combination, then the foil combination is clamped and fixed, after the clamping of the foil combination provided in the embodiment is completed, the foil combination can be ground or cut to form the micro cutter blank described above, after the micro cutter blank is processed, the middle of the connecting portion 12 of the micro cutter blank can be cut to form 2*N micro cutter units, the end face of the tool bit 13 of the micro cutter unit is sharpened to form a micro cutter, the micro cutter blank provided in the embodiment is stacked along the thickness direction of the micro cutter blank, which effectively improves the overall bearing capacity of the micro cutter blank, enables each foil structure 10 to protect each other, shares the energy generated during processing, maximizes the problem of micro cutter blank fracture caused by unstable factors such as tool and blank vibration, current fluctuation, etc., thereby effectively preparing micro cutters with a diameter of less than 80 μm in batches, effectively improving production efficiency and reducing production cost.

[0048] In summary, the micro cutter blank and the micro cutter preparation method provided in the embodiment have at least the following beneficial technical effects: when the micro cutter blank provided in the embodiment is used to prepare a micro cutter with a diameter of less than 80 μm, the micro cutter blank provided in the embodiment is first clamped, after the clamping of the micro cutter blank provided in the embodiment is completed, the connecting portion 12 of the plurality of foil structures 10 is symmetrically cut along the thickness direction of the micro cutter blank provided in the embodiment, thereby effectively symmetrically dividing the micro cutter blank provided in the embodiment, after the micro cutter blank provided in the embodiment is symmetrically divided, the symmetrically divided micro cutter blank provided in the embodiment is removed from the clamp, and each divided foil structure 10 stacked is separated, after each divided foil structure 10 stacked is completely separated, the end face of the connecting portion 12 of each divided foil structure 10 is sharpened, and a plurality of micro cutters are obtained after the sharpening is completed, the micro cutter blank provided in the embodiment is stacked along the thickness direction of the micro cutter blank, which effectively improves the overall bearing capacity of the micro cutter blank, enables each foil structure 10 to protect each other, shares the energy generated during processing, maximizes the problem of micro cutter blank fracture caused by unstable factors such as tool and blank vibration, current fluctuation, etc., thereby effectively preparing micro cutters with a diameter of less than 80 μm in batches, effectively improving production efficiency and reducing production cost.

[0049] The above merely provides preferred embodiments of the present application, and is not used to limit the present application. Any modification, equivalent replacement, and improvement made in the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A micro-tool blank, characterized in that, The micro-tool blank includes a multi-layer foil structure (10), the foil structure (10) includes two tool body parts (11) and a connecting part (12) located between the two tool body parts (11), and multiple foil structures (10) are stacked along the thickness direction of the micro-tool blank; The foil structure (10) includes two cutting heads (13), which are respectively disposed on two cutting tool bodies (11). The two cutting heads (13) located on the same foil structure (10) are connected to each other to form the connecting part (12). The micro-cutting tool blank also includes multiple adhesive layers, which are respectively disposed between two adjacent foil structures (10). The foil structure (10) is made of tungsten and has a thickness of 5 to 60 μm; The cross-section of the cutting head (13) perpendicular to the length direction of the micro-tool blank is square, so as to form 4 natural chip removal grooves (15) on the side of the cutting head (13); The outer periphery of the cutter head (13) is provided with a spiral groove that winds along the length direction of the cutter head (13); There are multiple spiral grooves, and the multiple spiral grooves are parallel.

2. The micro-tool blank according to claim 1, characterized in that, The foil structure (10) has a thickness of 50 μm.

3. The micro-tool blank according to claim 1, characterized in that, The adhesive layer is a water-soluble adhesive layer.

4. A method for preparing micro-tools, characterized in that, The micro-tool preparation method includes: N layers of foil blanks are stacked and placed to form a foil assembly; The foil assembly is clamped and fixed in place; The foils are combined and ground or cut to form the micro-tool blank as described in claim 1; The middle of the connecting part (12) of the micro-tool blank is cut to form 2*N micro-tool units; The micro-tool unit is sharpened to obtain a micro-tool.

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