CN114101821B - Electrode and preparation method thereof, helical gear forming die and helical gear - Google Patents
Electrode and preparation method thereof, helical gear forming die and helical gear Download PDFInfo
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- CN114101821B CN114101821B CN202111300159.1A CN202111300159A CN114101821B CN 114101821 B CN114101821 B CN 114101821B CN 202111300159 A CN202111300159 A CN 202111300159A CN 114101821 B CN114101821 B CN 114101821B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/22—Electrodes specially adapted therefor or their manufacture
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/02—Wire-cutting
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Abstract
The invention relates to the technical field of helical gear production, and provides an electrode and a preparation method thereof, a helical gear forming die and a helical gear; the preparation method of the electrode comprises the following steps: the electrode mould is formed by laminating and combining a plurality of layers of first group of electrode foils, straight-toothed spur gear cavities with preset sizes are formed by cutting all the layers of the first group of electrode foils in a uniform line mode, and the layers of the first group of electrode foils are combined to form a three-dimensional helical-toothed spur gear cavity; cutting the multilayer second group of electrode foils into a plurality of straight spur gear electrodes with preset sizes; embedding all straight-tooth cylindrical gear electrodes into all layers of straight-tooth cylindrical gear cavities corresponding to the three-dimensional helical-tooth cylindrical gear cavities; and sintering the electrode die embedded with the plurality of straight toothed spur gear electrodes to obtain the electrode. By the method, the use of a precise hobbing machine and a fine hobbing cutter thereof is avoided, and the processing difficulty and the processing cost are effectively reduced.
Description
Technical Field
The invention relates to the technical field of helical gear production, and particularly provides an electrode, a preparation method, a helical gear forming die and a helical gear.
Background
In various electric products, a minute cylindrical gear is used in large quantities. In order to realize low-cost mass production, metal and plastic tiny cylindrical gears are usually produced by an injection molding method; therefore, the preparation of the gear mold is a technical key.
The micro straight toothed spur gear mold cavity can be machined through a micro-wire electrode slow wire-moving electrospark wire-electrode cutting process, but the micro helical toothed spur gear mold cavity is very troublesome to machine, a precise gear hobbing machine is generally needed to machine a micro helical toothed spur gear electrode, and then the micro helical toothed spur gear electrode is used for obtaining the mold cavity through long-time discharge machining on a precise electrospark machining machine tool with a rotary electric spindle; not only the processing cycle of the mould is long, high-end equipment needs to be imported from foreign countries, and the production cost is high. More seriously, for a very tiny helical gear, the preparation of the hobbing cutter is very difficult, even impossible, and only a straight gear with a corresponding specification can be used. However, compared with a straight toothed spur gear, the helical toothed spur gear is continuously meshed, so that the transmission is stable, the noise is low, the workpiece efficiency is high, and the service life is long. Helical gears are therefore preferred.
Disclosure of Invention
The invention aims to provide an electrode, a preparation method, a helical gear forming die and a helical gear, and aims to solve the problems that the conventional helical gear production is high in cost and even cannot be prepared.
In order to achieve the purpose, the invention adopts the technical scheme that:
in a first aspect, the present invention provides a method for preparing an electrode, comprising: the method comprises the following steps that a plurality of layers of first group electrode foils are combined in a laminated mode to form an electrode die, all layers of the first group electrode foils are cut in a uniform line mode to form straight-tooth cylindrical gear cavities with preset sizes, the central axes of all the straight-tooth cylindrical gear cavities are overlapped, all the straight-tooth cylindrical gear cavities sequentially wind the central axes along the laminated layer of the first group electrode foils in a winding mode by preset angles, and all the straight-tooth cylindrical gear cavities are combined in a laminated mode to form a three-dimensional helical gear cavity; cutting the multilayer second group of electrode foils into a plurality of straight toothed spur gear electrodes with preset sizes in a wire cutting mode; embedding all straight-toothed cylindrical gear electrodes into all layers of straight-toothed cylindrical gear cavities corresponding to the three-dimensional helical-toothed cylindrical gear cavities; and sintering the electrode mould embedded with the plurality of straight toothed spur gear electrodes to obtain the electrode.
The invention has the beneficial effects that: the invention provides a preparation method of an electrode, which comprises the steps of respectively carrying out linear cutting on a plurality of layers of first group electrode foils to form a straight toothed cylindrical gear cavity with a preset size, combining the plurality of layers of first group electrode foils in a laminated manner to form an electrode mould, combining the straight toothed cylindrical gear cavities by rotating one side of each layer by a preset angle to form a three-dimensional helical toothed cylindrical gear cavity, carrying out linear cutting on a plurality of straight toothed cylindrical gear electrodes on a second group electrode foil, respectively embedding the straight toothed cylindrical gear electrodes into the straight toothed cylindrical gear cavities of each layer corresponding to the three-dimensional helical toothed cylindrical gear cavity, and forming the electrode by sintering; by the method, the use of a precise hobbing machine and a fine hobbing cutter thereof is avoided, and the processing difficulty and the processing cost are effectively reduced.
In one embodiment, in the step of combining a plurality of first sets of electrode foil stacks to form an electrode mold: cutting the first group of electrode foils of each layer into straight toothed spur gear cavities; sequentially laminating the first group of electrode foils after wire cutting, wherein the central axes of the first group of electrode foils and the straight spur gear cavity of the previous layer of electrode foil have a difference of a preset angle; and clamping and fixing the electrode mold formed after lamination.
By adopting the technical scheme, the first group of electrode foils of each layer are respectively subjected to line cutting to form the straight-toothed spur gear cavities, then the multilayer first group of electrode foils subjected to line cutting are stacked to form the electrode mold, and when the electrode molds are sequentially stacked, the first group of electrode foils of each layer sequentially rotate for a preset angle along the direction of the first group of electrode foils of the previous layer and around the central axis of the straight-toothed spur gear cavities, so that the straight-toothed spur gear cavities are combined to form the three-dimensional helical gear cavities.
In one embodiment, in the step of combining a plurality of electrode foil stacks of the first set of electrode foils to form the electrode mold: laminating and combining the multiple layers of first group of electrode foils, and clamping one end of the multiple layers of first group of electrode foils; and sequentially carrying out wire cutting on the first group of electrode foils of each layer to form a straight spur gear cavity, thus obtaining the electrode mould.
By adopting the technical scheme, the first group of the electrode foils are firstly laminated and one end of the first group of the electrode foils is clamped, so that the first group of the electrode foils of each layer is prevented from being staggered, and then the first group of the electrode foils of each layer are sequentially subjected to wire cutting to form the straight toothed spur gear cavity, so that the electrode mould and the three-dimensional helical gear cavity are obtained.
In one embodiment, in the step of sequentially cutting the first group of electrode foils of each layer to form the straight spur gear cavities: bending one side of the first group of electrode foils after the wire cutting is finished, which is far away from the first group of electrode foils in the wire cutting; and bending the other side of the first group of electrode foils to be subjected to wire cutting, which is deviated from the first group of electrode foils in the wire cutting.
By adopting the technical scheme, the first group of electrode foils which are subjected to wire cutting and waiting for wire cutting are respectively deviated from the first group of electrode foils in the wire cutting and bent, so that mutual interference between the first group of electrode foils during the wire cutting is avoided.
In one embodiment, a stopper is disposed between the first group of electrode foils that have completed the wire cutting and the first group of electrode foils in the wire cutting, and a stopper is also disposed between the first group of electrode foils to be wire cut and the first group of electrode foils in the wire cutting.
By adopting the technical scheme, the first group of electrode foils in the wire cutting are respectively provided with the stop blocks between the first group of electrode foils and the first group of electrode foils for completing the wire cutting and waiting for the wire cutting, so that the first group of electrode foils which are bent are prevented from rebounding to influence the wire cutting.
In one embodiment, the preset angle
Wherein d is the diameter of the gear pitch circle of the straight spur gear cavity, l is the thickness of the first group of electrode foils, and beta is the helix angle of the electrodes.
By adopting the technical scheme, the corresponding angle can be calculated through the calculation formula of the preset angle, so that the electrode with the corresponding size can be obtained conveniently.
In one embodiment, in the step of sintering the electrode mold fitted with the plurality of spur gear electrodes: putting the electrode mould embedded with a plurality of straight-toothed spur gear electrodes into a pressure thermal diffusion welding machine for pressure sintering; and after sintering is finished, removing the electrode mould.
By adopting the technical scheme, the electrode mould embedded with the plurality of straight toothed spur gear electrodes is sintered by using a pressure thermal diffusion welding machine to obtain the electrode.
In a second aspect, the invention also provides an electrode, which is formed by sintering according to the preparation method of the electrode.
The invention has the beneficial effects that: the electrode provided by the invention is formed by sintering through the preparation method of the electrode, the production process is simple, the production cost is low, and the mass production can be realized.
In a third aspect, the invention also provides a helical gear forming die, which is formed by adopting the electrode rotating discharge machining.
The invention has the beneficial effects that: the helical gear forming die provided by the invention is obtained by utilizing the electrode through the rotary discharge machining of the electric spark machine tool, and the production cost of the electrode is low, so that the helical gear forming die produced by the electrode is lower in production cost.
In a fourth aspect, the invention further provides a helical gear, and the helical gear is prepared and molded by adopting the helical gear molding die.
The invention has the beneficial effects that: according to the helical gear provided by the invention, on the basis of the preparation and molding of the helical gear molding die, the production cost of the helical gear is lower.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of a method for manufacturing an electrode according to an embodiment of the present invention;
FIG. 2 is a schematic view of an electrode mold provided in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a first group of electrode foils according to an embodiment of the present invention.
Wherein, in the figures, the various reference numbers:
10. an electrode mold; 101. a three-dimensional helical cylindrical gear cavity; 11. a first set of electrode foils; 111. a straight spur gear cavity.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The micro cylindrical gear is widely used in various electric products. Compared with a straight-tooth cylindrical gear, the helical cylindrical gear is continuously meshed, transmission is stable, noise is low, workpiece efficiency is high, and service life is long. Helical gears are therefore preferred. In order to realize low-cost mass production, metal and plastic tiny cylindrical gears are usually produced by an injection molding method; therefore, the preparation of the gear mold is a technical key. The existing preparation method generally needs to use a precise hobbing machine to process a micro helical gear electrode, and then uses the micro helical gear electrode to obtain a die cavity by long-time discharge machining on a precise electric spark machining machine tool with a rotary electric spindle; not only the processing cycle of the mould is long, high-end equipment needs to be imported from foreign countries, and the production cost is high. More seriously, for a very tiny helical gear, the preparation of the hobbing cutter is very difficult, even impossible, and only a straight gear with a corresponding specification can be used.
The invention provides an electrode, a preparation method, a helical gear forming die and a helical gear, wherein a three-dimensional helical gear cavity is formed by combining straight-tooth cylindrical gear cavities arranged on a plurality of layers of first group of electrode foils, a plurality of straight-tooth cylindrical gear electrodes are formed by wire-cutting the second group of electrode foils, the straight-tooth cylindrical gear electrodes are embedded into the corresponding straight-tooth cylindrical gear cavities of the three-dimensional helical gear cavity, the electrodes are formed by sintering, the helical gear forming die can be obtained by processing the electrodes, and finally the helical gear forming die can be used for producing the helical gears in batch. By the method, the use of a precise hobbing machine and a fine hobbing cutter thereof is avoided, and the processing difficulty and the processing cost are effectively reduced.
Referring to fig. 1 to fig. 3, in a first aspect, the present invention provides a method for manufacturing an electrode, including: the method comprises the steps that a plurality of layers of first group electrode foils 11 are stacked and combined to form an electrode mould 10, all layers of the first group electrode foils 11 are cut in a uniform line to form straight-tooth cylindrical gear cavities 111 with preset sizes, the central axes of all the straight-tooth cylindrical gear cavities 111 are overlapped, all the straight-tooth cylindrical gear cavities 111 sequentially surround the central axes along the stacking sequence of the first group electrode foils 11 and sequentially differ by preset angles, and all the straight-tooth cylindrical gear cavities 111 are stacked and combined to form a three-dimensional helical-tooth cylindrical gear cavity 101; cutting the multilayer second group of electrode foils into a plurality of straight spur gear electrodes with preset sizes in a wire cutting mode; embedding all straight toothed spur gear electrodes into all layers of straight toothed spur gear cavities 111 corresponding to the three-dimensional helical toothed spur gear cavity 101; the electrode mold 10 in which the plurality of spur gear electrodes are fitted is sintered, and an electrode is obtained.
The preset angle refers to that, in the multiple layers of the first group of electrode foils 11, the spur gear cavities 111 of the first group of electrode foils 11 in each layer are different from the spur gear cavities 111 of the first group of electrode foils 11 in the previous layer or the next layer by the same angle around the central axis, and the different angle is the preset angle. The preset size refers to a size of the spur gear cavity 111 preset to obtain a specific size of the electrode, wherein the preset size includes a reference circle diameter, a number of teeth, a modulus, a pressure angle, a helix angle, and the like. It can be understood that, in order to obtain the electrodes with corresponding shapes, when the first group of electrode foils 11 are subjected to wire cutting, the cross-sectional shape and size of the spur gear cavities 111 are consistent with the cross-section of the electrodes.
The preparation method of the electrode provided by the invention comprises the steps of respectively carrying out linear cutting on a plurality of layers of first group electrode foils 11 to form a straight spur gear cavity 111 with a preset size, laminating and combining the plurality of layers of first group electrode foils 11 to form an electrode mould 10, combining all the straight spur gear cavities 111 through rotating each layer by a preset angle to form a three-dimensional helical gear cavity 101, carrying out linear cutting on a plurality of straight spur gear electrodes on the second group electrode foils, respectively embedding the straight spur gear electrodes into all the layers of straight spur gear cavities 111 corresponding to the three-dimensional helical gear cavity 101, and forming the electrode through sintering; by the method, the use of a precise hobbing machine and a fine hobbing cutter thereof is avoided, and the processing difficulty and the processing cost are effectively reduced.
In one embodiment, in the step of combining a plurality of layers of the first set of electrode foils 11 in a stack to form the electrode mold 10: cutting each layer of the first group of electrode foils 11 into straight spur gear cavities 111; sequentially laminating the first group of electrode foils 11 subjected to wire cutting, wherein the difference between each layer of first group of electrode foils 11 and the central axis of the first group of electrode foils 11 on the straight-tooth cylindrical gear cavity 111 is a preset angle; the electrode mold 10 formed after lamination is clamped and fixed. In the embodiment, first, the first group of electrode foils 11 of each layer are cut in a linear manner, so that the first group of electrode foils 11 of each layer are formed with the straight-toothed spur gear cavities 111 with preset sizes, then the first group of electrode foils 11 of each layer are sequentially stacked and combined to form the electrode mold 10, and the straight-toothed spur gear cavities 111 of each layer are respectively different from the straight-toothed spur gear cavities 111 of the previous layer by preset angles about the central axis, so that the straight-toothed spur gear cavities 111 of multiple layers are combined to form the three-dimensional helical-toothed spur gear cavities 101; and clamping and fixing the electrode mould 10 formed after lamination, preventing the dislocation between the first group of electrode foils 11 of each layer and avoiding the structure of the three-dimensional helical gear cavity 101 from being damaged.
In one embodiment, in the step of combining a plurality of layers of the first set of electrode foils 11 in a stack to form the electrode mold 10: laminating and combining a plurality of layers of first group electrode foils 11, and clamping one end of the plurality of layers of first group electrode foils 11; and sequentially carrying out linear cutting on each layer of the first group of electrode foils 11 to form a straight spur gear cavity 111, thus obtaining the electrode mould 10. In this embodiment, the electrode mold 10 is formed by laminating and combining a plurality of layers of the first group of electrode foils 11, and then the first group of electrode foils 11 are clamped and fixed, and then the wire cutting operation is performed on each layer of the first group of electrode foils 11, so as to obtain the three-dimensional helical gear cavity 101. It can be understood that, in order to achieve the purpose that the cavities 111 of the spur gears sequentially wind around the central axis along the stacking sequence of the first group of electrode foils 11 with a preset angle difference, when each line cuts the first group of electrode foils 11 on the lower layer, the cavities 111 of the spur gears on the upper layer rotate around the central axis by a preset angle and then are cut. Compared with the mode of firstly cutting and then laminating and combining in the previous embodiment, the mode of firstly laminating, combining, fixing and then respectively cutting is adopted in the embodiment, the centering performance of the straight spur gear cavity 111 in each layer is better, and the size of the obtained three-dimensional helical spur gear cavity 101 is more accurate.
In one embodiment, in the step of sequentially wire-cutting each layer of the first group electrode foil 11 to form the spur gear cavities 111: bending the side of the first group of electrode foils 11 which is subjected to the wire cutting and is away from the first group of electrode foils 11 in the wire cutting; the other side of the first group of electrode foils 11 to be wire cut, which is away from the first group of electrode foils 11 in the wire cutting, is bent. In order to avoid mutual interference between the first group of electrode foils 11 during layer-by-layer wire cutting, the first group of electrode foils 11 after wire cutting and the first group of electrode foils 11 to be subjected to wire cutting are bent away from the first group of electrode foils 11 during wire cutting, one ends, far away from the clamping, of the first group of electrode foils 11 during wire cutting are tiled and fixed, and then the first group of electrode foils 11 are subjected to wire cutting. It can be understood that the spur gear cavities 111 formed by wire cutting on the first group of electrode foils 11 of each layer are all of a preset size, and the sizes of the spur gear cavities 111 are the same.
In one embodiment, a stopper is disposed between the first group of electrode foils 11 completing the wire cutting and the first group of electrode foils 11 in the wire cutting, and a stopper is also disposed between the first group of electrode foils 11 to be wire cut and the first group of electrode foils 11 in the wire cutting. The first group of electrode foils 11 for completing the wire cutting and waiting for the wire cutting are blocked by the stop block, so that the first group of electrode foils 11 in the wire cutting are prevented from being influenced.
In one embodiment, the preset angle
Wherein d is the gear pitch circle diameter of the spur gear cavity 111, and l is the first group of electrode foilsThe thickness of the material 11, beta, is the helix angle of the electrode. The corresponding angle can be calculated through the calculation formula of the preset angle, so that the electrode with the corresponding size can be obtained.
In one embodiment, in the step of sintering the electrode mold 10 in which the plurality of spur gear electrodes are embedded: putting the electrode mould 10 embedded with a plurality of straight-toothed spur gear electrodes into a pressure thermal diffusion welding machine for pressure sintering; after sintering is completed, the electrode mold 10 is removed. The electrode mold 10 in which the plurality of spur gear electrodes are fitted is sintered by a pressure thermal diffusion welding machine to obtain an electrode.
In a second aspect, the invention also provides an electrode, which is formed by sintering according to the preparation method of the electrode. The electrode provided by the invention is formed by sintering through the preparation method of the electrode, the production process is simple, the production cost is low, and the large-batch production can be realized.
In a third aspect, the invention further provides a helical gear forming die, which is formed by the electrode rotating discharge machining. The helical gear forming die provided by the invention is obtained by utilizing the electrode through the rotary discharge machining of the electric spark machine tool, and the production cost of the electrode is low, so that the helical gear forming die produced by the electrode is lower in production cost.
In a fourth aspect, the invention further provides a helical gear, and the helical gear is prepared and molded by adopting the helical gear molding die. According to the helical gear provided by the invention, on the basis of the preparation and molding of the helical gear molding die, the production cost of the helical gear is lower.
Referring to fig. 1 to 3, taking actual production as an example, the parameters of the helical gear to be produced are: the diameter of a reference circle is 5.9594mm, the number of teeth is 28, the normal modulus is 0.2, the pressure angle is 20 degrees, the helix angle is 20 degrees, and the thickness of the gear is 3 mm; pure copper foils with the thickness of 0.1mm are adopted as the first group of electrode foils 11 and the second group of electrode foils. Laminating and combining 30 layers of pure copper foil, and laminating and combining the 30 layers of pure copper foilOne end of the copper foil is clamped and fixed from beginning to end so as not to be mutually dislocated. Then, the pure copper foil is wire-cut layer by layer to form a multi-layer spur gear cavity 111. In order to avoid mutual interference between the wire-electrode cutting pure copper foils, the pure copper foils to be processed and the processed pure copper foils need to be respectively deviated from the pure copper foils in the processing process to be bent, and a stop block is used for blocking to prevent springback; after being tiled and fixed, the pure copper foil in processing is processed by linear cutting to form a straight spur gear cavity 111; processing the straight spur gear cavity 111 layer by the processing method; it will be appreciated that the sizes of the various layers of spur gear cavities 111 are all the same, and that the cross-sectional shape and size of the spur gear cavities 111 are set to the cross-sectional shape of the helical gear cavity to be obtained. Meanwhile, when each layer of pure copper foil is cut in a linear mode, the central axis of the cylindrical gear cavity being cut coincides with the central axis of the cylindrical gear cavity cut in the previous layer, and the cylindrical gear cavity being cut rotates around the central axis relative to the cylindrical gear cavity cut in the previous layer
The pure copper foil is processed layer by the method to obtain the electrode mould 10, and the electrode mould 10 is internally provided with 30 layers of straight-toothed spur gear cavities 111 which have the same size and rotate around the central axis by 0.7 degrees layer by layer to form a three-dimensional helical-toothed spur gear cavity 101. Then preparing 30 layers of pure copper foil, and linearly cutting 30 layers of straight toothed spur gear electrodes from the 30 layers of pure copper foil at one time; the 30 spur gear electrodes are embedded into all layers of the spur gear cavities 111 of the three-dimensional helical gear cavity 101 one by one, then the electrode mould 10 and the embedded spur gear electrodes are placed into a pressure thermal diffusion welding machine for pressure sintering, after sintering is completed, the electrode mould 10 is removed, and sintered electrodes are obtained, wherein the total thickness of the electrodes is 3 mm. Finally, the skew is obtained by the rotary discharge machining using the electrode on a precision electric discharge machine tool having a rotary electric spindle with the die steel of S136 as the object to be machinedThe gear cylindrical gear forming die is provided with a die cavity with the thickness of 3 mm. The helical gear forming die can be used for producing helical gears in batches.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A method of making an electrode, comprising:
laminating and combining a plurality of layers of first group of electrode foils to form an electrode mould, wherein all layers of the first group of electrode foils are cut in an equal line mode to form straight-toothed spur gear cavities with preset sizes, the central axes of all the straight-toothed spur gear cavities are overlapped, all the straight-toothed spur gear cavities sequentially surround the central axes along the lamination of the first group of electrode foils and sequentially differ by preset angles, and all the straight-toothed spur gear cavities are laminated and combined to form a three-dimensional helical gear cavity;
cutting the multilayer second group of electrode foils into a plurality of straight spur gear electrodes with preset sizes in a wire cutting mode;
embedding all the straight-toothed spur gear electrodes into all the straight-toothed spur gear cavities corresponding to the three-dimensional helical-toothed spur gear cavities;
and sintering the electrode die embedded with the plurality of straight toothed spur gear electrodes to obtain the electrode.
2. The method of claim 1, wherein in the step of combining a plurality of first sets of electrode foil stacks to form an electrode mold:
cutting each layer of the first group of electrode foils into straight toothed spur gear cavities;
sequentially laminating the first group of electrode foils after wire cutting, wherein each layer of the first group of electrode foils and the previous layer of the first group of electrode foils rotate for a preset angle relative to the central axis of the straight spur gear cavity;
and clamping and fixing the electrode mould formed after lamination.
3. The method of claim 1, wherein in the step of combining a plurality of first set of electrode foil stacks to form an electrode mold:
combining a plurality of layers of the first group of electrode foils in a laminated manner, and clamping one end of the plurality of layers of the first group of electrode foils;
and sequentially carrying out wire cutting on each layer of the first group of electrode foils to form the straight spur gear cavity, thus obtaining the electrode mould.
4. The method for preparing the electrode according to claim 3, wherein in the step of sequentially wire-cutting each layer of the first group of electrode foils to form the straight spur gear cavities:
bending a side of the first set of electrode foils finished with the wire cutting away from the first set of electrode foils in the wire cutting;
and bending the other side of the first group of electrode foils to be subjected to wire cutting, which is deviated from the first group of electrode foils in wire cutting.
5. The method for producing an electrode according to claim 4, wherein: and a stop block is arranged between the first group of electrode foils for completing the wire cutting and the first group of electrode foils in the wire cutting, and the stop block is also arranged between the first group of electrode foils to be subjected to the wire cutting and the first group of electrode foils in the wire cutting.
6. The method for producing an electrode according to claim 1, wherein: the preset angle
And d is the diameter of the gear pitch circle of the straight spur gear cavity, l is the thickness of the first group of electrode foils, and beta is the helical angle of the electrodes.
7. The method for producing an electrode according to claim 1, wherein: in the step of sintering the electrode mold fitted with a plurality of spur gear electrodes:
putting the electrode mould embedded with a plurality of straight toothed spur gear electrodes into a pressure thermal diffusion welding machine for pressure sintering;
and after sintering is finished, removing the electrode mould.
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| CN202111300159.1A CN114101821B (en) | 2021-11-04 | 2021-11-04 | Electrode and preparation method thereof, helical gear forming die and helical gear |
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| CN202111300159.1A CN114101821B (en) | 2021-11-04 | 2021-11-04 | Electrode and preparation method thereof, helical gear forming die and helical gear |
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| CN114101821B true CN114101821B (en) | 2022-09-30 |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH05309529A (en) * | 1992-05-11 | 1993-11-22 | Shinko Sellbick:Kk | Electric discharge machining device |
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| CN110814450A (en) * | 2019-11-29 | 2020-02-21 | 深圳大学 | Preparation method of multi-material laminated electrode |
| CN111185642A (en) * | 2020-01-09 | 2020-05-22 | 深圳大学 | Micro electrochemical machining electrode, machining method thereof, and micro electrochemical machining apparatus |
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| JPH05309529A (en) * | 1992-05-11 | 1993-11-22 | Shinko Sellbick:Kk | Electric discharge machining device |
| US6204466B1 (en) * | 1997-09-23 | 2001-03-20 | G.W. Plastics, Inc. | EDM electrode for creating a gear tooth form having a tooth shape in a cavity component and method of making an EDM electrode |
| JPH11207529A (en) * | 1998-01-19 | 1999-08-03 | Toyota Motor Corp | Manufacture of die for helical gear |
| JP2006272419A (en) * | 2005-03-30 | 2006-10-12 | Mitsubishi Materials Pmg Corp | Production method of die for powder molding |
| CN102672050A (en) * | 2012-05-25 | 2012-09-19 | 武汉理工大学 | Precision stamping mold and rotary precision stamping forming method using same to process helical gears |
| CN203171101U (en) * | 2013-04-07 | 2013-09-04 | 宁波兴利模具有限公司 | Bevel wheel electrosparking jig |
| CN105537703A (en) * | 2016-01-12 | 2016-05-04 | 深圳大学 | Laminated fitting preparing method for three-dimensional microelectrode |
| CN109877406A (en) * | 2019-03-15 | 2019-06-14 | 武汉理工大学 | Cylindric spiral gear mold cavity digital control wire-electrode cutting taper WEDM error determines method |
| CN110814450A (en) * | 2019-11-29 | 2020-02-21 | 深圳大学 | Preparation method of multi-material laminated electrode |
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| CN114101821A (en) | 2022-03-01 |
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