Polygonal clamp for punching rod discharge machining

Abstract

The polygonal clamp is used for clamping a hexagonal punching rod and comprises a clamp body of a regular hexagonal prism structure, a clamping cavity is formed in the clamp body in the axial direction of the clamp body, the clamping cavity penetrates through the bottom face and the top face of the clamp body, the cross section of the clamping cavity is in a regular hexagon shape, and the cross section of the clamping cavity is in a regular hexagon shape. A clamping cavity is formed in the clamp body, the inner wall of the clamping cavity is parallel to the side wall, close to the clamping cavity, of the clamp body, a dihedral angle of the clamping cavity is a clamping angle, a locking bolt right facing the clamping angle is arranged on the clamp body, and the tail end of the locking bolt extends into the clamping cavity. The fixture is simple and practical, the hexagonal punching rod is clamped through the locking bolts and the side walls of the corresponding clamping angles, the contact area is wide, the clamping effect is more stable, the punching rod abuts against the two side walls of the clamping angles at the same time under the action of the locking bolts and is automatically perpendicular to the bottom face and the top face of the fixture, the time for adjusting the reference is shortened, and the working efficiency is improved. And the clamping requirement that the punching rods of various specifications are contained in the clamping cavity is met, and the application range is widened.

Description

Technical Field

[0001] This application relates to the technical field of cold heading dies, and particularly relates to a polygonal fixture for electrical discharge machining of punch rods. Background Art

[0002] The punch rod in the cold heading die usually needs to machine uneven patterns or characters on the end face for marking models or specifications, etc. However, due to the high hardness of the punch rod, reaching HRC60 - 67, it cannot be machined using a engraving machine or a milling cutter. Usually, "electrical discharge machining" is used, and a fixture is required on the electrical discharge machine to clamp the punch rod before machining. The equipped parallel jaw vice fixture uses a "two - point" contact, with a small clamping force, and it is easy to cause the end face of the clamped punch rod and the electrode to be non - perpendicular, which requires a lot of time to adjust the reference, increasing the machining time. Therefore, improvements are needed. Summary of the Utility Model

[0003] The purpose of the present utility model is to provide a polygonal fixture for electrical discharge machining of punch rods to overcome the deficiencies in the prior art.

[0004] To achieve the above - mentioned purpose, the present utility model provides the following technical solutions:

[0005] The embodiment of the present application discloses a polygonal fixture for electrical discharge machining of punch rods, which is used to clamp a hexagonal punch rod. It includes a fixture body with a regular hexagonal prism structure. A clamping cavity is arranged along the axial direction of the fixture body. The clamping cavity penetrates the bottom surface and the top surface of the fixture body. The cross - section of the clamping cavity is a regular hexagon. The inner walls of the clamping cavity are respectively parallel to the adjacent side walls of the fixture body. One dihedral angle of the clamping cavity is a clamping angle. A locking bolt is arranged on the fixture body opposite to the clamping angle, and the tail end of the locking bolt extends into the interior of the clamping cavity.

[0006] Further, in the above - mentioned polygonal fixture for electrical discharge machining of punch rods, a backing plate is arranged between the tail end of the locking bolt and the hexagonal punch rod to be machined. The side surface of the backing plate facing away from the locking bolt is concavely provided with a V - shaped groove corresponding to the hexagonal punch rod.

[0007] Further, in the above - mentioned polygonal fixture for electrical discharge machining of punch rods, the length of the backing plate is less than the height of the fixture body, and both ends of the backing plate do not protrude from the bottom surface and the top surface of the fixture body.

[0008] Further, in the above - mentioned polygonal fixture for electrical discharge machining of punch rods, the tail end of the locking bolt is rotatably connected to the backing plate through a bearing.

[0009] Further, in the above - mentioned polygonal fixture for electrical discharge machining of punch rods, the number of the locking bolts is at least two.

[0010] Further, in the above-mentioned polygonal fixture for punch rod electric discharge machining, an installation plane corresponding to the locking bolt is provided on the outer wall of the fixture body. The locking bolt is perpendicular to the axial direction of the fixture body, and its central axis is located in the angular bisecting plane of the clamping angle.

[0011] Further, in the above-mentioned polygonal fixture for punch rod electric discharge machining, a locking nut is provided on the locking bolt, and the locking nut is arranged outside the clamping cavity.

[0012] Compared with the prior art, the advantages of the present utility model are as follows: The polygonal fixture for punch rod electric discharge machining has a simple structure. The hexagonal punch rod is clamped by the locking bolt and the side walls corresponding to the clamping angle, with a wide contact area and a more stable clamping effect. Under the action of the locking bolt, the punch rod abuts against the two side walls of the clamping angle at the same time, automatically perpendicular to the bottom surface and the top surface of the fixture, reducing the time for adjusting the calibration reference, accommodating the clamping requirements of various specifications of punch rods in the clamping cavity, and expanding the scope of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0014] Figure 1 The figure shows a schematic structural diagram of a polygonal fixture for punch rod electric discharge machining in a specific embodiment of the present utility model.

[0015] Figure 2 The figure shows a schematic connection diagram of a locking bolt and a backing plate in a specific embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The following will combine the drawings in the embodiments of the present utility model to describe the technical solutions in the embodiments of the present utility model in detail. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0017] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0018] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0019] Refer Figure 1 and Figure 2 As shown, a polygonal fixture for the electrical discharge machining of a punch rod, which is used to clamp a hexagonal punch rod, includes a fixture body 1 with a regular hexagonal prism structure. A clamping cavity 11 along its axial direction is arranged inside the fixture body 1. The clamping cavity 11 penetrates the bottom surface and the top surface of the fixture body 1. The cross-section of the clamping cavity 11 is a regular hexagon. The inner walls of the clamping cavity 11 are respectively parallel to the adjacent side walls of the fixture body 1. One dihedral angle of the clamping cavity 11 is a clamping angle. A locking bolt 2 is arranged on the fixture body 1 opposite to the clamping angle, and the tail end of the locking bolt 2 extends into the interior of the clamping cavity 11.

[0020] In this technical solution, the fixture body is processed from existing hexagonal steel, etc., which is convenient for material collection and reduces production costs. A clamping cavity with a regular hexagonal cross-section is machined along its axial direction inside the fixture body. To improve the material utilization rate, the inner walls of the clamping cavity are parallel to the adjacent side walls of the fixture body. One of the dihedral angles of the clamping cavity is used as the clamping angle, and a locking bolt is arranged on one side relative to the clamping angle. The punch rod to be processed is pressed against the two side surfaces of the clamping angle through the locking bolt, and the punch rod is fixed along the axial direction of the fixture. The polygonal fixture for the electrical discharge machining of a punch rod has a simple structure and low cost, and is suitable for wide popularization. The hexagonal punch rod is clamped by the locking bolt and the side wall corresponding to the clamping angle, with a wide contact area and a more stable clamping effect. Under the action of the locking bolt, the punch rod is pressed against the two side walls of the clamping angle at the same time, automatically perpendicular to the bottom surface and the top surface of the fixture, reducing the time for adjusting the calibration reference, and accommodating the clamping requirements of various specifications of punch rods in the clamping cavity, expanding the scope of application.

[0021] Exemplarily, refer toFigure 1 and Figure 2 As shown, a backing plate 3 is arranged between the tail end of the locking bolt 2 and the hexagonal punch to be processed, and a V-shaped groove corresponding to the hexagonal punch is concavely arranged on the side of the backing plate 3 away from the locking bolt 2.

[0022] In this technical solution, the V-groove is an open groove of 120°. The locking bolt is supported on the surface of the punch rod through a pad and does not directly act on the side edges of the punch rod. The two side walls of the V-groove are respectively fitted to the corresponding sides of the punch rod, thereby improving the reliability and stability of clamping.

[0023] For example, see Figure 1 As shown, the length of the backing plate 3 is smaller than the height of the clamp body 1 , and both ends of the backing plate 3 do not protrude from the bottom surface and the top surface of the clamp body 1 .

[0024] In this technical solution, the pad does not interfere with the placement of the fixture on the magnetic disk of the spark machine and the contact between the spark machine electrode and the punch rod. The pad can be set independently and operated by hand. The pad is attached to the surface of the punch rod and placed together in the clamping cavity. The locking bolt is tightened until the tail end of the locking bolt abuts against the surface of the pad and the punch rod is completely fixed.

[0025] For example, see Figure 2 As shown, the rear end of the locking bolt 2 is rotatably connected to the backing plate 3 through the bearing 4.

[0026] In this technical solution, the bearing can be a conventional thrust bearing, etc., a step hole corresponding to the bearing is processed in the pad, and the bearing is fixed by a retaining ring, etc., a step shaft corresponding to the bearing is protruded from the tail end of the locking bolt, and is axially fixed to the bearing by a conventional retaining ring, etc., and the rotation of the locking bolt does not affect the fit between the pad and the punch rod.

[0027] For example, see Figure 1 As shown, the number of the locking bolts 2 is at least two.

[0028] In this technical solution, two locking bolts are connected to the same pad. When in use, the two locking bolts are rotated alternately to prevent the pad from twisting and deforming until the punch rod is fixed or loosened. Pads can also be set at the tail ends of the two locking bolts respectively, so that the locking bolts can be operated separately without interfering with each other.

[0029] For example, see Figure 1 and Figure 2 As shown, the outer wall of the clamp body 1 is provided with a mounting plane corresponding to the locking bolt 2, the locking bolt 2 is perpendicular to the axial direction of the clamp body 1, and the axis thereof is located in the angular bisector of the clamping angle.

[0030] In this technical solution, threaded through-holes corresponding to the locking bolts are machined inside the fixture body. The installation plane facilitates positioning for machining the threaded through-holes, improving machining accuracy, thereby ensuring the setting accuracy of the locking bolts. The locking bolts are arranged perpendicular to the axial direction of the punching rod, and their central axes are located in the angular bisecting plane of the clamping angle. The acting forces of the two sides of the clamping angle on the punching rod are the same, improving the clamping stability.

[0031] Exemplarily, referring to Figure 1 As shown, a locking nut 5 is provided on the locking bolt 2, and the locking nut 5 is arranged outside the clamping cavity 11.

[0032] In this technical solution, a conventional hexagonal nut can be selected as the locking nut. It cooperates with the threaded through-hole to self-lock the locking bolt, avoiding loosening of the locking bolt caused by vibration or the like, and improving the clamping reliability.

[0033] In summary, the polygonal fixture for punching rod electrical discharge machining has a simple structure. It clamps the hexagonal punching rod through the locking bolt and the side walls of the corresponding clamping angle, with a wide contact area and a more stable clamping effect. Under the action of the locking bolt, the punching rod abuts against the two side walls of the clamping angle at the same time, automatically perpendicular to the bottom and top surfaces of the fixture, reducing the time for adjusting the calibration reference, accommodating the clamping requirements of various specifications of punching rods in the clamping cavity, and expanding the scope of application.

[0034] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0035] The above are only specific embodiments of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A polygonal fixture for punch discharge machining, used to clamp a hexagonal punch, characterized in that: The invention comprises a clamping body of a regular hexagonal prism structure, wherein a clamping cavity is arranged inside the clamping body along its axial direction, the clamping cavity passes through the bottom surface and the top surface of the clamping body, the cross section of the clamping cavity is a regular hexagon, the inner walls of the clamping cavity are respectively parallel to the side walls of the clamping body adjacent to it, a dihedral angle of the clamping cavity is a clamping angle, and a locking bolt facing the clamping angle is arranged on the clamping body, and the tail end of the locking bolt extends to the inside of the clamping cavity.

2. The polygonal fixture for punch discharge machining according to claim 1, characterized in that: A backing plate is arranged between the tail end of the locking bolt and the hexagonal punch rod to be processed, and a V-shaped groove corresponding to the hexagonal punch rod is concavely arranged on the side of the backing plate away from the locking bolt.

3. The polygonal fixture for punch discharge machining according to claim 2, characterized in that: The length of the pad is smaller than the height of the clamp body, and both ends of the pad do not protrude from the bottom surface and the top surface of the clamp body.

4. The polygonal fixture for punch discharge machining according to claim 2, characterized in that: The tail end of the locking bolt is rotatably connected to the pad through a bearing.

5. The polygonal fixture for punch discharge machining according to claim 1, characterized in that: The number of the locking bolts is at least two.

6. The polygonal fixture for punch discharge machining according to claim 5, characterized in that: The outer wall of the clamp body is provided with a mounting plane corresponding to the locking bolt, the locking bolt is perpendicular to the axial direction of the clamp body, and the axis thereof is located in the angular bisector of the clamping angle.

7. The polygonal fixture for punch discharge machining according to claim 1, characterized in that: The locking bolt is provided with a locking nut, and the locking nut is arranged outside the clamping cavity.

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