A machining electrode and machining method for a sharp corner in a slot hole of a die steel piece

Abstract

The application discloses a processing electrode and a processing method for a sharp corner in a groove hole of a die steel piece. The processing electrode comprises a first electrode body, a first group of processing cutters, the first group of processing cutters comprising a rough processing sub-cutter and a plurality of fine processing sub-cutters, the rough processing sub-cutter and the plurality of fine processing sub-cutters of the first group of processing cutters being sequentially arranged on the first electrode body, the rough processing sub-cutter and the plurality of fine processing sub-cutters of the first group of processing cutters being matched with the groove hole of the die steel piece to be processed, and the rough processing sub-cutter and the plurality of fine processing sub-cutters of the first group of processing cutters being sequentially used to process the sharp corner in the groove hole of the die steel piece to be processed by using different processing parameters. The application can be used for high-precision processing of the sharp corner in the groove hole of the die steel piece, the root radius of the sharp corner in the groove hole of the die steel piece is smaller, the precision of the processing of the sharp corner in the groove hole of the die steel piece is improved, and the die steel piece is more suitable for the use requirement of a die.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of die steel part machining, in particular to a machining electrode and a machining method for a die steel part slot hole inner corner. BACKGROUND

[0002] In die steel part components, some die steel part components need to be machined into closed slot holes, and most of the die steel part slot holes are square or square-shaped (with local special-shaped parts). For such die steel parts, the inner corner position is usually designed to have a radius of at least 0.2 mm or more according to the actual machining situation, because the current machining method cannot achieve high-precision inner corners.

[0003] The existing machining methods for the inner corners of die steel part slot holes are as follows: 1. Mechanical machining, which adopts cutter milling machining. However, milling machining has the factor of cutter radius, so it cannot machine high-precision inner and outer corners. 2. Electric spark wire cutting machining. This method can machine the inner corners of die steel part slot holes to be smaller than the mechanical machining method. However, this method adopts copper wire electro-erosion machining, and the cutting tool is a copper wire with a diameter of 0.25 mm or 0.2 mm. Similarly, there is a copper wire radius R0.125 mm or R0.1 mm round corner at the root of the inner corner of the slot hole. However, even if the root of the inner corner of the slot hole has only a round corner with a radius R0.1 mm, it still cannot meet the needs of high-precision small parts for die steel parts. This brings many difficulties to the high-precision machining of the inner corners of die steel part slot holes, and it is difficult to machine the inner corners of the die steel part slot holes with higher precision. SUMMARY

[0004] The purpose of the present application is to provide a machining electrode and a machining method for the inner corners of die steel part slot holes, which can be used for high-precision machining of the inner corners of die steel part slot holes, make the radius of the root of the inner corner of the die steel part slot hole smaller, improve the precision of the machining of the inner corner of the die steel part slot hole, and make the die steel part more meet the use requirements of the die.

[0005] To achieve the above purpose, in a first aspect, the present application provides a machining electrode for the inner corners of die steel part slot holes, comprising:

[0006] a first electrode body;

[0007] a first group of machining tools, the first group of machining tools comprising a rough machining sub-tool and a plurality of fine machining sub-tools, the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools being sequentially arranged on the first electrode body; the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools being adapted to the slot hole of the die steel part to be machined;

[0008] When the machining electrode is used for machining the sharp corners in the groove of the mold steel piece to be machined, the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools are used to sequentially machine the sharp corners in the groove of the mold steel piece to be machined by using different machining parameters.

[0009] In the implementation process of the above technical solution, the machining electrode is used for machining the sharp corners in the groove of the mold steel piece to be machined by means of electric spark forming machining. In the machining process, the mold steel piece to be machined can be first cut to have a predetermined groove by using a copper wire through electric spark wire cutting machining, and then the machining electrode is used to machine the sharp corners in the groove of the mold steel piece to be machined. In the specific machining operation, the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools can be sequentially used to machine the sharp corners in the groove of the mold steel piece to be machined by using different machining parameters. Since the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools are matched with the groove of the mold steel piece to be machined, the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools have corresponding sharp corners. The sharp corners are used to machine the sharp corners in the groove of the mold steel piece, so that the root radius of the sharp corners in the groove of the mold steel piece can be made smaller, the precision of machining the sharp corners in the groove of the mold steel piece is improved, and the mold steel piece can better meet the use requirements of the mold.

[0010] In the preferred embodiments of the present application, the mold steel piece to be machined has a plurality of regularly distributed grooves.

[0011] The machining electrode further comprises a second group of machining tools, the second group of machining tools comprises a rough machining sub-tool and a plurality of fine machining sub-tools, the rough machining sub-tool and the plurality of fine machining sub-tools of the second group of machining tools are sequentially arranged on the first electrode body; the rough machining sub-tool and the plurality of fine machining sub-tools of the second group of machining tools are matched with the groove of the mold steel piece to be machined.

[0012] When the machining electrode is used for machining the sharp corners in the groove of the mold steel piece to be machined, the rough machining sub-tool and the plurality of fine machining sub-tools of the second group of machining tools are used to sequentially machine the sharp corners in the groove of the mold steel piece to be machined by using different machining parameters.

[0013] When the machining electrode is used for machining the sharp corners in the groove of the mold steel piece to be machined, the first group of machining tools is used to machine the sharp corners in the odd-numbered groove of the mold steel piece to be machined, and the second group of machining tools is used to machine the sharp corners in the even-numbered groove of the mold steel piece to be machined.

[0014] In the implementation process of the above technical solution, the second group of machining tools and the first group of machining tools have the same characteristics and adopt the same machining logic. Through the cooperation of the second group of machining tools and the first group of machining tools, the machining of the inner sharp corners of the mold steel piece to be machined with dense and complex grooves can be facilitated. Moreover, by dividing the machining tool into two parts, the production and manufacturing of the machining electrode can be facilitated, and the production and manufacturing cost can be reduced.

[0015] In the preferred embodiment of the present application, the groove of the mold steel piece to be machined has a special-shaped part, and the special-shaped part has an inner sharp corner.

[0016] The machining electrode further comprises a second electrode body and a third group of machining tools. The third group of machining tools comprises a rough machining sub-tool and a plurality of fine machining sub-tools. The rough machining sub-tool and the plurality of fine machining sub-tools of the third group of machining tools are sequentially arranged on the second electrode body. The rough machining sub-tool and the plurality of fine machining sub-tools of the third group of machining tools are adapted to the special-shaped part of the inner sharp corner of the groove of the mold steel piece to be machined.

[0017] When the machining electrode is used to machine the inner sharp corner of the groove of the mold steel piece to be machined, the rough machining sub-tool and the plurality of fine machining sub-tools of the third group of machining tools sequentially machine the inner sharp corner of the groove of the mold steel piece to be machined by using different machining parameters.

[0018] In the implementation process of the above technical solution, for the mold steel piece to be machined with a groove having a special-shaped part, the third group of machining tools on the second electrode body is used to machine the inner sharp corner of the special-shaped part of the groove of the mold steel piece to be machined. This facilitates the machining of the inner sharp corner of the groove of such mold steel piece. Moreover, the third group of machining tools and the first group of machining tools have the same characteristics and adopt the same machining logic. This facilitates the use and operation of the machining electrode. Through the cooperation of the third group of machining tools and the first group of machining tools, the machining tool can be divided into two parts. The two types of machining tools can be used to match the groove of such mold steel piece. This facilitates the production and manufacturing of the machining electrode, and reduces the production and manufacturing cost.

[0019] In the preferred embodiment of the present application, the mold steel piece to be machined has a plurality of regularly distributed grooves.

[0020] The machining electrode further comprises a fourth group of machining tools. The fourth group of machining tools comprises a rough machining sub-tool and a plurality of fine machining sub-tools. The rough machining sub-tool and the plurality of fine machining sub-tools of the fourth group of machining tools are sequentially arranged on the second electrode body. The rough machining sub-tool and the plurality of fine machining sub-tools of the fourth group of machining tools are adapted to the special-shaped part of the inner sharp corner of the groove of the mold steel piece to be machined.

[0021] When the machining electrode is used to machine the inner corner of the groove hole of the mold steel piece to be machined, the rough machining sub-tool and the plurality of fine machining sub-tools of the fourth group of machining tools are used to machine the inner corner of the groove hole of the mold steel piece to be machined in turn by using different machining parameters.

[0022] When the machining electrode is used to machine the inner corner of the groove hole of the mold steel piece to be machined, the third group of machining tools is used to machine the inner corner of the odd groove hole of the mold steel piece to be machined, and the fourth group of machining tools is used to machine the inner corner of the even groove hole of the mold steel piece to be machined.

[0023] In the implementation process of the above technical solution, the fourth group of machining tools has the same characteristics as the third group of machining tools, and the same machining logic is used. Through the cooperation of the fourth group of machining tools and the third group of machining tools, the machining of the inner corner of the mold steel piece to be machined with dense and complex groove holes can be facilitated, and by dividing the machining tools into two parts, the production and manufacturing of the machining electrode can be facilitated, and the production and manufacturing cost can be reduced.

[0024] In a second aspect, the present application provides a machining method for the inner corner of the groove hole of a mold steel piece, which applies the machining electrode for the inner corner of the groove hole of the mold steel piece described above. The machining method comprises the following steps:

[0025] Pre-machining the quenched mold steel piece;

[0026] Cutting the predetermined groove hole on the pre-machined mold steel piece by using the copper wire through the wire electrical discharge machining method;

[0027] Using the machining electrode to machine the inner corner of the groove hole of the mold steel piece to be machined by using the first group of machining tools in turn according to the predetermined different machining parameters.

[0028] In the implementation process of the above technical solution, a copper wire is used to cut a predetermined slot hole on the mold steel piece to be machined by means of electric spark wire cutting, and then the machining electrode is used to machine the sharp corner in the slot hole of the mold steel piece to be machined. In the specific machining operation, the coarse machining sub-tool of the first machining tool and the plurality of fine machining sub-tools can be used in turn to machine the sharp corner in the slot hole of the mold steel piece to be machined by using different machining parameters. Since the coarse machining sub-tool of the first machining tool and the plurality of fine machining sub-tools are matched with the slot hole of the mold steel piece to be machined, the coarse machining sub-tool of the first machining tool and the plurality of fine machining sub-tools have corresponding sharp corners, and the sharp corner in the slot hole of the mold steel piece is machined by the corresponding sharp corner, so that the root radius of the sharp corner in the slot hole of the mold steel piece becomes smaller, the precision of machining the sharp corner in the slot hole of the mold steel piece is improved, and the mold steel piece can better meet the use requirements of the mold.

[0029] In the preferred embodiment of the present application, the pre-machining of the quenched mold steel piece comprises:

[0030] The quenched mold steel piece is coarsely machined to remove excess material, the quenched mold steel piece is aged and stress relieved, and the quenched mold steel piece is ground with a first predetermined excess amount on one side to correct the shape of the quenched mold steel piece.

[0031] In the implementation process of the above technical solution, the quenched mold steel piece is pre-machined in this way, which can make the outer surface of the quenched mold steel piece have high precision, can be beneficial to machining a slot hole with high precision on the mold steel piece, and can also improve the precision of the sharp corner in the slot hole of the mold steel piece to be machined.

[0032] In the preferred embodiment of the present application, after the quenched mold steel piece is ground with a first predetermined excess amount on one side to correct the shape of the quenched mold steel piece, the pre-machining of the quenched mold steel piece further comprises:

[0033] A copper wire with a first predetermined diameter is used to machine the shape of the quenched mold steel piece by means of electric spark wire cutting to leave a second predetermined excess amount on one side to semi-finish the quenched mold steel piece, the quenched mold steel piece is aged and stress relieved, and the shape of the quenched mold steel piece is precisely ground to correct the shape of the quenched mold steel piece to within a predetermined shape and position tolerance range.

[0034] In the implementation process of the above technical solution, the shape of the quenched mold steel piece is machined by means of electric spark wire cutting using a copper wire, and the shape of the quenched mold steel piece is precisely ground to correct the shape of the quenched mold steel piece to within a predetermined shape and position tolerance range, which can greatly improve the precision of the outer surface of the quenched mold steel piece.

[0035] In the preferred embodiment of the present application, the copper wire is used to cut the predetermined slot hole on the pre-processed mold steel piece by means of wire electrical discharge machining, which comprises:

[0036] The copper wire with a second predetermined diameter is used to cut the predetermined slot hole on the pre-processed mold steel piece by means of wire electrical discharge machining;

[0037] The slot hole cut on the mold steel piece is modified multiple times by means of wire electrical discharge machining with the copper wire of the second predetermined diameter, so that the surface roughness of the slot hole cut on the mold steel piece reaches the predetermined roughness, and the form and position tolerance of the slot hole cut on the mold steel piece is within the predetermined range.

[0038] In the implementation process of the above technical solution, the copper wire is used to cut the predetermined slot hole on the pre-processed mold steel piece by means of wire electrical discharge machining, and multiple modifications are made by using the copper wire, which can effectively make the surface roughness of the slot hole cut on the mold steel piece reach the predetermined roughness, and the form and position tolerance of the slot hole cut on the mold steel piece is within the predetermined range, which can greatly improve the precision of the slot hole of the mold steel piece, thereby facilitating the high-precision machining of the sharp corners in the slot hole of the mold steel piece.

[0039] In the preferred embodiment of the present application, when the machining electrode is used for electrical discharge forming machining, the coarse machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools are used in sequence according to the predetermined different machining parameters to machine the sharp corners in the slot hole of the mold steel piece to be machined.

[0040] In the implementation process of the above technical solution, the machining electrode is used for electrical discharge forming machining, and the coarse machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools are used in sequence according to the predetermined different machining parameters to machine the sharp corners in the slot hole of the mold steel piece to be machined.

[0041] In the preferred embodiment of the present application, the machining electrode is used for electrical discharge forming machining, and the coarse machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools are used in sequence according to the predetermined different machining parameters to machine the sharp corners in the slot hole of the mold steel piece to be machined, which comprises:

[0042] The machining electrode is used for electrical discharge forming machining, and the coarse machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools are used in sequence according to the predetermined different spark patterns and different spark positions to machine the sharp corners in the slot hole of the mold steel piece to be machined.

[0043] The different spark patterns and different spark positions corresponding to the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools gradually become smaller according to the use sequence of the sub-tools.

[0044] In the implementation process of the above technical solution, the different spark patterns and different spark positions corresponding to the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools gradually become smaller according to the use sequence of the sub-tools, that is, the machining precision of the machining sub-tools gradually becomes more precise and fine, so that the corner cleaning effect on the inner corner can be significantly improved, and the precision of the inner corner of the groove hole of the machined mold steel part is more ideal.

[0045] Compared with the prior art, the machining electrode and the machining method for the inner corner of the groove hole of the mold steel part have at least the following beneficial effects:

[0046] The machining electrode for the inner corner of the groove hole of the mold steel part comprises a first electrode body and a first group of machining tools, the first group of machining tools comprises a rough machining sub-tool and a plurality of fine machining sub-tools, and the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools are sequentially arranged on the first electrode body; the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools are matched with the groove hole of the mold steel part to be machined; the machining electrode is used for machining the inner corner of the groove hole of the mold steel part to be machined by means of electric spark forming machining, in the machining, the mold steel part to be machined can be first cut to have a predetermined groove hole on the mold steel part to be machined by means of electric spark wire cutting machining, and then the inner corner of the groove hole of the mold steel part to be machined is machined by using the machining electrode; in the specific machining operation, the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools can be sequentially used to machine the inner corner of the groove hole of the mold steel part to be machined by using different machining parameters; since the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools are matched with the groove hole of the mold steel part to be machined, the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools have corresponding corners, the inner corner of the groove hole of the mold steel part is machined by using the corresponding corners, and thus the root radius of the inner corner of the groove hole of the mold steel part can become smaller, the machining precision of the inner corner of the groove hole of the mold steel part is improved, and the mold steel part can be more suitable for the use requirement of the mold.

[0047] The machining method for the inner corner of the groove hole of the mold steel part according to the present application applies the machining electrode for the inner corner of the groove hole of the mold steel part, so that the root radius of the inner corner of the groove hole of the mold steel part can become smaller, the machining precision of the inner corner of the groove hole of the mold steel part is improved, and the mold steel part can be more suitable for the use requirement of the mold. BRIEF DESCRIPTION OF DRAWINGS

[0048] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those of ordinary skill in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0049] Figure 1 is a schematic diagram of a three-dimensional structure of a mold steel part provided by the embodiments of the present application;

[0050] Figure 2 is a schematic diagram of a front view structure of a mold steel part provided by the embodiments of the present application;

[0051] Figure 3 is a schematic diagram of a three-dimensional structure of a first electrode body, a first group of machining tools and a second group of machining tools provided by the embodiments of the present application;

[0052] Figure 4 is a schematic diagram of a front view structure of a first electrode body, a first group of machining tools and a second group of machining tools provided by the embodiments of the present application;

[0053] Figure 5 is a schematic diagram of machining a mold steel part using a first group of machining tools provided by the embodiments of the present application;

[0054] Figure 6 is a partial structure enlarged view of Figure 5 ;

[0055] Figure 7 is a schematic diagram of machining a mold steel part using a second group of machining tools provided by the embodiments of the present application;

[0056] Figure 8 is a partial structure enlarged view of Figure 7 ;

[0057] Figure 9 is a schematic diagram of a three-dimensional structure of a second electrode body, a third group of machining tools and a fourth group of machining tools provided by the embodiments of the present application;

[0058] Figure 10 is a schematic diagram of a front view structure of a second electrode body, a third group of machining tools and a fourth group of machining tools provided by the embodiments of the present application.

[0059] Reference signs: 11-first electrode body; 12-first group of machining tools; 13-second group of machining tools; 21-second electrode body; 22-third group of machining tools; 23-fourth group of machining tools. DETAILED DESCRIPTION

[0060] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0061] In the present application, the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like are based on the orientations or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0062] In addition, in addition to being used to indicate the orientations or positional relationships, the above-mentioned partial terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. Those of ordinary skill in the art can understand the specific meanings of these terms in the present application according to the specific circumstances.

[0063] In addition, the terms "mount", "set", "provided with", "connect", "connected" should be broadly understood. For example, it can be a fixed connection, a detachable connection, or a monolithic structure; it can be a mechanical connection, or a point connection; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present application according to the specific circumstances.

[0064] In addition, the terms "first", "second", and the like are mainly used to distinguish different devices, elements or components (the specific types and structures can be the same or different), and are not intended to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise stated, the meaning of "multiple" is two or more.

[0065] For the die steel piece with square or square-like shape (there are local special-shaped parts), the inner sharp corner position is usually designed with a radius of at least 0.2mm or more according to the actual processing situation, because the current processing method cannot achieve high-precision inner sharp corners. The inner sharp corner of the die steel piece can be processed smaller by wire electro-discharge machining than by mechanical processing, but this method uses copper wire electro-erosion machining, and the cutting tool is a copper wire with a diameter of Ф0.25mm or Ф0.2mm, which also leaves a copper wire radius R0.125mm or R0.1mm at the root of the inner sharp corner of the slot hole. However, even if the root of the inner sharp corner of the slot hole has only a radius R0.1mm, it still cannot meet the needs of high-precision small parts for molds, which brings many difficulties to the high-precision processing of the inner sharp corner of the slot hole of the die steel piece, and it is difficult to process an inner sharp corner with higher precision in the slot hole of the die steel piece.

[0066] To solve the problems in the prior art, the embodiment of the present application provides a processing electrode and a processing method for the inner sharp corner of the slot hole of a die steel piece, which can be used for high-precision processing of the inner sharp corner of the slot hole of the die steel piece, so that the root radius of the inner sharp corner of the slot hole of the die steel piece becomes smaller, the precision of the processing of the inner sharp corner of the slot hole of the die steel piece is improved, and the die steel piece can better meet the use requirements of the mold.

[0067] Embodiment one

[0068] Referring to Figures 1 to 8 , wherein, Figure 1 and Figure 2 The die steel piece given is an exemplary structure of a die steel piece, and different die steel pieces have their own structures and shapes and numbers of slot holes; Figure 3 and Figure 4 The processing electrode given is suitable for Figure 1 and Figure 2 The processing electrode given is an exemplary processing electrode structure of a die steel piece, which cannot completely represent a processing electrode for the inner sharp corner of the slot hole of a die steel piece of the present application.

[0069] The processing electrode for the inner sharp corner of the slot hole of a die steel piece of the embodiment of the present application comprises a first electrode body 11 and a first group of processing cutters 12,

[0070] The first group of processing cutters 12 comprises a rough processing sub-cutter and a plurality of fine processing sub-cutters, and the rough processing sub-cutter and the plurality of fine processing sub-cutters of the first group of processing cutters 12 are sequentially arranged on the first electrode body 11; the rough processing sub-cutter and the plurality of fine processing sub-cutters of the first group of processing cutters 12 are matched with the slot hole of the die steel piece to be processed;

[0071] When the electrode is used to process the inner corner of the groove hole of the mold steel piece to be processed, the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools 12 are sequentially machined with different machining parameters.

[0072] In the embodiment, the groove hole of the mold steel piece is square or square-like (there are local special-shaped parts, such as Figure 1 and Figure 2 the local protruding part of the groove hole of the mold steel piece, that is, the special-shaped part), so that the groove hole of the mold steel piece has an inner corner, that is, the corner of the groove hole of the mold steel piece. Understandably, the inner corner of the groove hole of the mold steel piece is mostly a right angle, but it can also not be a right angle. Generally, the mold steel piece has a plurality of groove holes, and the plurality of groove holes of the mold steel piece are distributed according to certain rules. In the embodiment, the groove hole of the mold steel piece is a closed groove hole, that is, the periphery of the groove hole of the mold steel piece is closed.

[0073] In the embodiment, the electrode is used to process the inner corner of the groove hole of the mold steel piece by electric spark forming machining. In the embodiment, the first group of machining tools 12 includes a rough machining sub-tool and three fine machining sub-tools, as shown in Figure 3 and Figure 4 The first group of machining tools 12 is one row of machining tools, the first machining sub-tool in the corresponding row of machining tools is the rough machining sub-tool, and the second to fourth machining sub-tools in the corresponding row of machining tools are the three fine machining sub-tools. Understandably, the machining sub-tool does not mean only one machining sub-tool. In the embodiment, the machining sub-tool includes a plurality of machining sub-tool units, that is, one machining tool column as shown in Figure 3 and Figure 4 is a machining sub-tool unit. It should be noted that in other embodiments, the fine machining sub-tools of the first group of machining tools 12 can be other quantities, such as two or four, etc.

[0074] Understandably, the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools 12 are matched with the groove hole of the mold steel piece to be processed, not that the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools 12 are completely matched with the groove hole of the mold steel piece to be processed. The rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools 12 can be matched with the structure of the local structure or the key position.

[0075] It can be understood that when the electrode is used for machining the sharp corners in the groove hole of the mold steel part to be machined, the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools 12 use different machining parameters to sequentially machine the sharp corners in the groove hole of the mold steel part to be machined, that is, first, the rough machining sub-tool of the first group of machining tools 12 is used to initially machine the sharp corners in the groove hole of the mold steel part to be machined, and then the fine machining sub-tools of the first group of machining tools 12 are used one by one to re-machine the sharp corners in the groove hole of the mold steel part to be machined; during machining, the mold steel part to be machined does not need to be moved, and the corresponding machining sub-tools of the first group of machining tools 12 can be sequentially machined by moving the first electrode body 11; the machining parameters refer to the machining parameters related to the electric spark forming machining, for example, spark patterns, spark positions, etc., and it should be noted that different machining parameters do not mean that all machining sub-tools correspondingly use different machining parameters, which can be completely different or partially different.

[0076] The electrode for machining the sharp corners in the groove hole of the mold steel part of the embodiment of the application is used for machining the sharp corners in the groove hole of the mold steel part to be machined by the electric spark forming machining method. During machining, the mold steel part to be machined can first be cut by the copper wire through the electric spark wire cutting machining method to cut a predetermined groove hole on the mold steel part to be machined, and then the sharp corners in the groove hole of the mold steel part to be machined are machined by using the electrode. During specific machining operation, the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools 12 can be sequentially used to sequentially machine the sharp corners in the groove hole of the mold steel part to be machined by using different machining parameters. Since the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools 12 are matched with the groove hole of the mold steel part to be machined, the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools 12 have corresponding sharp corners, which are used to machine the sharp corners in the groove hole of the mold steel part, so that the root radius of the sharp corners in the groove hole of the mold steel part becomes smaller, the precision of machining the sharp corners in the groove hole of the mold steel part is improved, and the mold steel part can better meet the use requirements of the mold.

[0077] Embodiment two

[0078] Reference Figures 1 to 8 On the basis of the above-mentioned embodiment one, the difference between the embodiment and the embodiment one is that the electrode for machining the sharp corners in the groove hole of the mold steel part of the embodiment further includes a second group of machining tools 13, the second group of machining tools 13 includes a rough machining sub-tool and a plurality of fine machining sub-tools, and the rough machining sub-tool and the plurality of fine machining sub-tools of the second group of machining tools 13 are sequentially arranged on the first electrode body 11; the rough machining sub-tool and the plurality of fine machining sub-tools of the second group of machining tools 13 are matched with the groove hole of the mold steel part to be machined;

[0079] In the process of processing the electrode for processing the inner corner of the groove hole of the mold steel piece to be processed, the rough machining sub-tool of the second group of machining tools 13 and the plurality of fine machining sub-tools process the inner corner of the groove hole of the mold steel piece to be processed in turn using different machining parameters;

[0080] In the process of processing the electrode for processing the inner corner of the groove hole of the mold steel piece to be processed, the first group of machining tools 12 is used to process the inner corner of the groove hole of the odd-numbered groove hole of the mold steel piece to be processed, and the second group of machining tools 13 is used to process the inner corner of the groove hole of the even-numbered groove hole of the mold steel piece to be processed. For details, please refer to Figure 6 and Figure 8 .

[0081] In this embodiment, the second group of machining tools 13 includes a rough machining sub-tool and three fine machining sub-tools, as shown in Figure 3 and Figure 4 The second group of machining tools 13 is arranged side by side with the first group of machining tools 12, that is, another row of machining tools in the second group of machining tools 13, and the second group of machining tools 13 has the same characteristics as the first group of machining tools 12 and uses the same machining logic. In this embodiment, the second group of machining tools 13 will not be described and explained again. For understanding of the second group of machining tools 13, please refer to the description and explanation of the first group of machining tools 12 in Embodiment One. Here, no further description is given.

[0082] In this embodiment, the odd-numbered groove hole of the mold steel piece to be processed, that is, the groove hole with an odd number in the order of the groove hole in each row of the mold steel piece to be processed; the even-numbered groove hole of the mold steel piece to be processed, that is, the groove hole with an even number in the order of the groove hole in each row of the mold steel piece to be processed.

[0083] In the process of processing, the mold steel piece to be processed does not need to be moved. The first electrode body 11 can be moved first to make the corresponding machining sub-tools of the first group of machining tools 12 process the inner corner of the odd-numbered groove hole of the mold steel piece to be processed one by one. Then, the first electrode body 11 is rotated by 180 degrees, and the second group of machining tools 13 is moved to make the corresponding machining sub-tools process the inner corner of the even-numbered groove hole of the mold steel piece to be processed one by one.

[0084] In the above structure, the second group of machining tools 13 has the same characteristics as the first group of machining tools 12 and uses the same machining logic. Through the cooperation of the second group of machining tools 13 and the first group of machining tools 12, the inner corner of the mold steel piece to be processed with dense and complex groove holes (as shown in Figure 1 and Figure 2 ) can be processed conveniently. Moreover, by dividing the machining tools into two, the production and manufacturing of the machining electrode can be facilitated, and the production and manufacturing cost can be reduced.

[0085] Embodiment Three

[0086] With reference to Figures 1 to 10 On the basis of the above-mentioned embodiment one or embodiment two, the difference between this embodiment and embodiment one or embodiment two is that the machining electrode of the inner corner of the groove hole of the die steel piece of this embodiment has a special-shaped part, and the special-shaped part has an inner corner.

[0087] The machining electrode further comprises a second electrode body 21 and a third set of machining cutters 22, the third set of machining cutters 22 comprises a rough machining sub-cutter and a plurality of fine machining sub-cutters, the rough machining sub-cutter and the plurality of fine machining sub-cutters of the third set of machining cutters 22 are sequentially arranged on the second electrode body 21; the rough machining sub-cutter and the plurality of fine machining sub-cutters of the third set of machining cutters 22 are matched with the special-shaped part of the groove hole of the die steel piece to be machined.

[0088] When the machining electrode is used to machine the inner corner of the groove hole of the die steel piece to be machined, the rough machining sub-cutter and the plurality of fine machining sub-cutters of the third set of machining cutters 22 sequentially machine the inner corner of the groove hole of the die steel piece to be machined by using different machining parameters.

[0089] In this embodiment, the third set of machining cutters 22 comprises a rough machining sub-cutter and three fine machining sub-cutters, as shown in Figure 9 and Figure 10 The third set of machining cutters 22 is one row of machining cutters, and the third set of machining cutters 22 has the same characteristics as the first set of machining cutters 12 and uses the same machining logic. In this embodiment, the third set of machining cutters 22 will not be described and explained again. For the understanding of the third set of machining cutters 22, please refer to the description and explanation of the first set of machining cutters 12 in embodiment one, which will not be repeated here.

[0090] In this embodiment, through the combination of the third set of machining cutters 22 and the first set of machining cutters 12, the third set of machining cutters 22 and the first set of machining cutters 12 can match the shape of the groove hole of the die steel piece to be machined, and then the third set of machining cutters 22 and the first set of machining cutters 12 can be used in combination to machine the inner corner of the groove hole of the die steel piece to be machined. Specifically, during machining, the first set of machining cutters 12 can be used to machine the corresponding inner corner of the groove hole of the die steel piece to be machined first, or the first set of machining cutters 12 and the second set of machining cutters 13 can be used to machine the corresponding inner corner of the groove hole of the die steel piece to be machined first, and then the third set of machining cutters 22 can be used to machine the corresponding inner corner of the groove hole of the die steel piece to be machined first.

[0091] In the above structure, for the die steel piece to be processed, the die steel piece has a groove hole with a special-shaped part, and the inner sharp corner of the special-shaped part of the groove hole of the die steel piece to be processed is processed by the third set of processing cutters 22 on the second electrode body 21, which can facilitate the processing of the inner sharp corner of the groove hole of such die steel piece, and the third set of processing cutters 22 has the same characteristics as the first set of processing cutters 12, adopts the same processing logic, and can facilitate the use and operation of the processing electrode. Through the cooperation of the third set of processing cutters 22 and the first set of processing cutters 12, the processing cutters can be divided into two parts, and the two types of processing cutters can be matched with the groove hole of such die steel piece, which can facilitate the production of the processing electrode and reduce the production cost.

[0092] Embodiment Four

[0093] Referring to Figures 1 to 10 On the basis of the above-mentioned embodiment three, the difference between the present embodiment and embodiment three is that the processing electrode for the inner sharp corner of the groove hole of the die steel piece of the present embodiment further comprises a fourth set of processing cutters 23, the fourth set of processing cutters 23 comprises a rough machining sub-cutter and a plurality of fine machining sub-cutters, and the rough machining sub-cutter and the plurality of fine machining sub-cutters of the fourth set of processing cutters 23 are sequentially arranged on the second electrode body 21; the rough machining sub-cutter and the plurality of fine machining sub-cutters of the fourth set of processing cutters 23 are matched with the special-shaped part of the inner sharp corner of the groove hole of the die steel piece to be processed.

[0094] When the processing electrode is used to process the inner sharp corner of the groove hole of the die steel piece to be processed, the rough machining sub-cutter and the plurality of fine machining sub-cutters of the fourth set of processing cutters 23 sequentially process the inner sharp corner of the groove hole of the die steel piece to be processed with different processing parameters.

[0095] When the processing electrode is used to process the inner sharp corner of the groove hole of the die steel piece to be processed, the third set of processing cutters 22 is used to process the inner sharp corner of the odd-numbered groove hole of the die steel piece to be processed, and the fourth set of processing cutters 23 is used to process the inner sharp corner of the even-numbered groove hole of the die steel piece to be processed.

[0096] In the present embodiment, the fourth set of processing cutters 23 comprises a rough machining sub-cutter and three fine machining sub-cutters, as shown in Figure 9 and Figure 10 The fourth set of processing cutters 23 is another row of processing cutters, and the fourth set of processing cutters 23 has the same characteristics as the third set of processing cutters 22, adopts the same processing logic, and the present embodiment will not be described and explained. The understanding of the fourth set of processing cutters 23 can be referred to the description and explanation of the first set of processing cutters 12 in embodiment one, which will not be repeated here.

[0097] In the processing, the mold steel piece to be processed does not need to be moved. The third group of processing cutters 22 corresponding to the processing sub-cutters are used to process the odd-numbered inner corners of the groove holes of the mold steel piece to be processed one by one by moving the second electrode body 21. The fourth group of processing cutters 23 corresponding to the processing sub-cutters are used to process the even-numbered inner corners of the groove holes of the mold steel piece to be processed one by one by rotating the second electrode body 21 by 180 degrees and moving the second electrode body 21.

[0098] In the above structure, the fourth group of processing cutters 23 has the same characteristics as the third group of processing cutters 22, and the same processing logic is adopted. Through the cooperation of the fourth group of processing cutters 23 and the third group of processing cutters 22, the inner corners of the mold steel piece to be processed with dense and complex groove holes can be processed conveniently. Moreover, by dividing the processing cutters into two parts, the production and manufacturing of the processing electrode can be facilitated, and the production and manufacturing cost can be reduced.

[0099] Embodiment five

[0100] Referring to Figures 1 to 10 The embodiment of the present application provides a processing method for the inner corners of the groove holes of a mold steel piece, which applies the processing electrode for the inner corners of the groove holes of the mold steel piece in any one of the above-mentioned embodiments one to four. The processing method comprises the following steps.

[0101] Pre-processing the quenched mold steel piece;

[0102] Cutting predetermined groove holes on the pre-processed mold steel piece by means of electric spark wire cutting processing of copper wire;

[0103] Processing the inner corners of the groove holes of the mold steel piece to be processed by means of electric spark forming processing of the processing electrode, and using the rough processing sub-cutters of the first group of processing cutters 12 and a plurality of fine processing sub-cutters in sequence according to different processing parameters.

[0104] The processing method for the inner corners of the groove holes of the mold steel piece in the embodiment of the present application applies the above-mentioned processing electrode for the inner corners of the groove holes of the mold steel piece, so that the root radius of the inner corners of the groove holes of the mold steel piece becomes smaller, the precision of the processing of the inner corners of the groove holes of the mold steel piece is improved, and the mold steel piece can meet the use requirements of the mold more.

[0105] As an optional implementation, the pre-processing of the quenched mold steel piece comprises the following steps.

[0106] The quenched mold steel piece is roughed to remove excess material, the quenched mold steel piece is subjected to aging stress relief treatment, and the quenched mold steel piece is ground to correct the shape of the quenched mold steel piece with a first predetermined excess material left on one side.

[0107] In the above method, the quenched die steel part is pre-processed in this way, so that the outer surface of the quenched die steel part has high precision, which can facilitate the machining of high-precision grooves on the die steel part, and can also improve the precision of the sharp corners in the grooves of the die steel part to be machined.

[0108] Further, after the quenched die steel part is corrected in shape by grinding the quenched die steel part with a first predetermined allowance on one side, the quenched die steel part is pre-processed, which further includes:

[0109] The copper wire with a first predetermined diameter is used to process the quenched die steel part in shape by wire electrical discharge machining, and the quenched die steel part is aged and stress relieved, and the quenched die steel part is precisely ground in shape to correct the quenched die steel part in shape to within a predetermined shape and position tolerance range.

[0110] In the above method, the quenched die steel part is processed in shape by wire electrical discharge machining with a copper wire, and the quenched die steel part is precisely ground in shape to correct the quenched die steel part in shape to within a predetermined shape and position tolerance range, which can greatly improve the precision of the outer surface of the quenched die steel part.

[0111] As an optional embodiment, the predetermined grooves are cut on the pre-processed die steel part by wire electrical discharge machining with a copper wire, which includes:

[0112] The predetermined grooves are cut on the pre-processed die steel part by wire electrical discharge machining with a copper wire of a second predetermined diameter;

[0113] The grooves cut on the die steel part are modified multiple times by wire electrical discharge machining with a copper wire of a second predetermined diameter, so that the surface roughness of the grooves cut on the die steel part reaches a predetermined roughness, and the shape and position tolerance of the grooves cut on the die steel part is within a predetermined range.

[0114] In the above method, the predetermined grooves are cut on the pre-processed die steel part by wire electrical discharge machining with a copper wire, and the grooves cut on the die steel part are modified multiple times with the copper wire, which can effectively make the surface roughness of the grooves cut on the die steel part reach a predetermined roughness, and the shape and position tolerance of the grooves cut on the die steel part within a predetermined range, which can greatly improve the precision of the grooves of the die steel part, thereby facilitating the high-precision machining of the sharp corners in the grooves of the die steel part.

[0115] As an optional implementation, in the way of machining the inner sharp corner of the groove hole of the mold steel piece by means of the electrical discharge machining with the machining electrode, the inner sharp corner of the groove hole of the mold steel piece is machined in the way of left and right swinging by using the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools 12 in sequence according to the predetermined different machining parameters.

[0116] In the above method, the inner sharp corner of the groove hole of the mold steel piece is machined in the way of left and right swinging, so that the best effect of the sharp corner can be achieved when the inner sharp corner of the groove hole of the mold steel piece is machined.

[0117] As an optional implementation, in the way of machining the inner sharp corner of the groove hole of the mold steel piece by means of the electrical discharge machining with the machining electrode, the inner sharp corner of the groove hole of the mold steel piece is machined by using the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools 12 in sequence according to the predetermined different machining parameters, comprising:

[0118] In the way of machining the inner sharp corner of the groove hole of the mold steel piece by means of the electrical discharge machining with the machining electrode, the inner sharp corner of the groove hole of the mold steel piece is machined by using the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools 12 in sequence according to the predetermined different spark patterns and different spark positions;

[0119] The different spark patterns and different spark positions corresponding to the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools 12 gradually become smaller according to the use order of the sub-tools.

[0120] In the implementation process of the above technical solution, the different spark patterns and different spark positions corresponding to the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools 12 gradually become smaller according to the use order of the sub-tools, that is, the machining precision of the machining sub-tools gradually becomes more precise and fine, so that the effect of the sharp corner can be significantly improved, and the precision of the inner sharp corner of the groove hole of the mold steel piece is more ideal.

[0121] The above-mentioned method for machining the inner sharp corner of the groove hole of the mold steel piece of the embodiment will be exemplarily described and explained through a specific example.

[0122] In the machining of the inner sharp corner of the groove hole of the mold steel piece shown in Figure 1 and Figure 2 , the method for machining the inner sharp corner of the groove hole of the mold steel piece of the embodiment can be processed in the following step sequence:

[0123] I. The quenched mold steel piece is rough machined to remove the excess amount, the quenched mold steel piece is aged and stress treated, and the quenched mold steel piece is ground with a single side remaining 0.1mm excess amount to correct the shape of the quenched mold steel piece;

[0124] II. The profile of the semi-finished quenched die steel part is processed by means of wire electrical discharge machining with a copper wire of 0.2 mm in diameter, leaving a 0.15 mm margin on one side, and the quenched die steel part is aged and stress relieved, and the profile of the quenched die steel part is precisely ground and corrected to the predetermined shape and position tolerance range;

[0125] III. The predetermined groove is cut on the pre-processed die steel part by means of wire electrical discharge machining with a copper wire of 0.1 mm in diameter;

[0126] The groove cut on the die steel part is corrected six times by means of wire electrical discharge machining with a copper wire of 0.1 mm in diameter, so that the surface roughness of the groove cut on the die steel part is within Ra0.2u, and the shape and position tolerance of the groove cut on the die steel part is controlled within 0 / +0.002 mm;

[0127] IV. The inner corner of the groove of the die steel part is processed by means of electrical discharge forming machining with a processing electrode, using the first group of machining tools 12 in the order of the rough machining sub-tool and the plurality of fine machining sub-tools according to the predetermined different spark patterns and different spark positions;

[0128] During processing, the inner corner of the groove of the die steel part is processed by means of left and right swinging;

[0129] The different spark patterns and different spark positions corresponding to the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools 12 gradually decrease according to the order of use of the sub-tools, wherein the spark pattern corresponding to the rough machining sub-tool of the first group of machining tools 12 is VDI-16, and the spark position is -0.06 mm; the spark pattern corresponding to the first and second fine machining sub-tools of the first group of machining tools 12 is VDI-14, and the spark position is -0.03 mm; the spark pattern corresponding to the third fine machining sub-tool of the first group of machining tools 12 is VDI-12, and the spark position is -0.015 mm;

[0130] In this way, the processing of the inner corner of the groove of the die steel part can make the radius of the inner corner of the groove of the die steel part within R0.01 mm-R0.

[0131] The use of the second group of machining tools 13, the third group of machining tools 22 and the fourth group of machining tools 23 can refer to the use of the first group of machining tools 12 described above, which will not be described here. The use order of the four groups of machining tools has been described in the foregoing embodiments, and can refer to the use order of the four groups of machining tools described in the foregoing embodiments.

[0132] In all the above embodiments, "large", "small" are relative, "more", "less" are relative, "upper", "lower" are relative, and the description of such relative terms will not be repeated in the embodiments of the present application.

[0133] It should be understood that the expressions "in one embodiment", "in the present embodiment", "in the embodiments of the present application" or "as an optional implementation" mentioned throughout the specification mean that the specific features, structures or characteristics related to the embodiments are included in at least one embodiment of the present application. Therefore, the "in one embodiment", "in the present embodiment", "in the embodiments of the present application" or "as an optional implementation" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. Those skilled in the art should also know that the embodiments described in the specification are optional embodiments, and the actions and modules involved are not necessarily required by the present application.

[0134] In various embodiments of the present application, it should be understood that the size of the sequence number of the above processes does not mean the inevitable sequence of execution, and the execution sequence of the processes should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0135] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A machining electrode for machining a corner of a slot in a die steel piece, characterized by, The machining electrode comprises: a first electrode body (11); a first group of machining tools (12) comprising a rough machining sub-tool and a plurality of fine machining sub-tools, the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools (12) being sequentially arranged on the first electrode body (11); the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools (12) are matched with the groove holes of the mold steel workpiece to be machined; when the machining electrode is used for machining the inner sharp corners of the groove holes of the mold steel workpiece to be machined, the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools (12) sequentially machine the inner sharp corners of the groove holes of the mold steel workpiece to be machined by using different machining parameters; the mold steel workpiece to be machined has a plurality of regularly distributed groove holes; the machining electrode further comprises a second group of machining tools (13), the second group of machining tools (13) comprising a rough machining sub-tool and a plurality of fine machining sub-tools, the rough machining sub-tool and the plurality of fine machining sub-tools of the second group of machining tools (13) being matched with the groove holes of the mold steel workpiece to be machined; when the machining electrode is used for machining the inner sharp corners of the groove holes of the mold steel workpiece to be machined, the first group of machining tools (12) is used for machining the inner sharp corners of the odd-numbered groove holes of the mold steel workpiece to be machined, and the second group of machining tools (13) is used for machining the inner sharp corners of the even-numbered groove holes of the mold steel workpiece to be machined.

2. The electrode for machining a corner of a slot of a die steel piece according to claim 1, wherein the rough machining sub-tool and the plurality of fine machining sub-tools of the second group of machining tools (13) are sequentially arranged on the first electrode body (11); when the machining electrode is used for machining the inner sharp corners of the groove holes of the mold steel workpiece to be machined, the rough machining sub-tool and the plurality of fine machining sub-tools of the second group of machining tools (13) sequentially machine the inner sharp corners of the groove holes of the mold steel workpiece to be machined by using different machining parameters.

3. The electrode for machining a corner of a slot of a die steel piece according to claim 1, wherein the groove holes of the mold steel workpiece to be machined have a special-shaped part, and the special-shaped part has an inner sharp corner; the machining electrode further comprises a second electrode body (21) and a third group of machining tools (22), the third group of machining tools (22) comprising a rough machining sub-tool and a plurality of fine machining sub-tools, the rough machining sub-tool and the plurality of fine machining sub-tools of the third group of machining tools (22) being sequentially arranged on the second electrode body (21); the rough machining sub-tool and the plurality of fine machining sub-tools of the third group of machining tools (22) are matched with the special-shaped part of the groove holes of the mold steel workpiece to be machined; when the machining electrode is used for machining the inner sharp corners of the groove holes of the mold steel workpiece to be machined, the rough machining sub-tool and the plurality of fine machining sub-tools of the third group of machining tools (22) sequentially machine the inner sharp corners of the groove holes of the mold steel workpiece to be machined by using different machining parameters.

4. The electrode for machining a corner of a slot of a die steel piece according to claim 3, wherein the mold steel workpiece to be machined has a plurality of regularly distributed groove holes; The machining electrode further comprises a fourth group of machining tools (23), the fourth group of machining tools (23) comprising a rough machining sub-tool and a plurality of fine machining sub-tools, the rough machining sub-tool and the plurality of fine machining sub-tools of the fourth group of machining tools (23) being sequentially arranged on the second electrode body (21); the rough machining sub-tool and the plurality of fine machining sub-tools of the fourth group of machining tools (23) being adapted to the special-shaped part of the sharp corner in the groove hole of the mold steel piece to be machined; When the machining electrode is used to machine the sharp corner in the groove hole of the mold steel piece to be machined, the rough machining sub-tool and the plurality of fine machining sub-tools of the fourth group of machining tools (23) sequentially machine the sharp corner in the groove hole of the mold steel piece to be machined by using different machining parameters; When the machining electrode is used to machine the sharp corner in the groove hole of the mold steel piece to be machined, the third group of machining tools (22) is used to machine the sharp corner in the odd groove hole of the mold steel piece to be machined, and the fourth group of machining tools (23) is used to machine the sharp corner in the even groove hole of the mold steel piece to be machined.

5. A method of machining a corner of a slot in a die steel part, characterized by, The machining method comprises: preprocessing the quenched mold steel piece; cutting the predetermined groove hole on the preprocessed mold steel piece by using copper wire through wire electrical discharge machining; sequentially machining the sharp corner in the groove hole of the mold steel piece to be machined by using the rough machining sub-tool and the plurality of fine machining sub-tools of the first group of machining tools according to the predetermined different machining parameters through the wire electrical discharge machining by using the machining electrode.

6. The method of machining a corner in a slot of a die steel part of claim 5, wherein, The preprocessing the quenched mold steel piece comprises: rough machining the quenched mold steel piece to remove excess material, aging stress relief treatment of the quenched mold steel piece, and grinding the quenched mold steel piece with a first predetermined excess amount on one side to correct the shape of the quenched mold steel piece.

7. The method of machining a corner in a slot of a die steel part according to claim 6, wherein, After the grinding the quenched mold steel piece with a first predetermined excess amount on one side to correct the shape of the quenched mold steel piece, the preprocessing the quenched mold steel piece further comprises: aging stress relief treatment of the quenched mold steel piece by using a copper wire with a first predetermined diameter through wire electrical discharge machining to correct the shape of the quenched mold steel piece with a second predetermined excess amount on one side, and precisely grinding the quenched mold steel piece to correct the shape of the quenched mold steel piece to be within the predetermined shape and position tolerance range.

8. The method of claim 5, wherein the method further comprises: The cutting the predetermined groove hole on the preprocessed mold steel piece by using copper wire through wire electrical discharge machining comprises: cutting the predetermined groove hole on the preprocessed mold steel piece by using a copper wire with a second predetermined diameter through wire electrical discharge machining; correcting the groove hole cut on the mold steel piece multiple times by using a copper wire with a second predetermined diameter through wire electrical discharge machining, so that the surface roughness of the groove hole cut on the mold steel piece reaches the predetermined roughness, and the shape and position tolerance of the groove hole cut on the mold steel piece is within the predetermined range.

9. The method of claim 5, wherein the method further comprises: In the mode of using the machining electrode for electric spark forming machining, the first group of machining tools is used in turn according to different machining parameters to machine the sharp corners in the groove of the mold steel piece.

10. The method of claim 5 or 9, wherein the method further comprises: The mode of using the machining electrode for electric spark forming machining, the first group of machining tools is used in turn according to different machining parameters to machine the sharp corners in the groove of the mold steel piece, including: The mode of using the machining electrode for electric spark forming machining, the first group of machining tools is used in turn according to different machining parameters to machine the sharp corners in the groove of the mold steel piece, including: The different spark patterns and different spark positions corresponding to the first group of machining tools gradually become smaller according to the order of using the sub-tools.

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