Large-stroke wire cut electrical discharge machining tool with cutting section wire tightening structure

Abstract

The utility model provides a large-stroke wire cut electrical discharge machining tool with a cutting section wire tightening structure, which comprises a winding and unwinding assembly, a taper assembly and a wire returning assembly, and further comprises a wire tightening assembly, the wire tightening assembly is mounted on the taper assembly and is close to a cutting section of a molybdenum wire, and the wire tightening assembly is mounted on the taper assembly and is close to the cutting section of the molybdenum wire. As the wire tightening assembly directly acts on the portion close to the cutting section of the molybdenum wire, the state of the cutting section can be controlled more directly and more effectively, the molybdenum wire can keep proper tensioning degree in the cutting process, the accuracy and consistency of the cutting track can be guaranteed, and therefore the cutting precision is improved; the wire tightening assembly can keep the molybdenum wire in the optimal tensioning state, so that the service life of the molybdenum wire is prolonged, the position of the wire tightening assembly is adjusted along with the taper assembly, the tensioning state of the molybdenum wire can be considered during taper adjustment, the synergistic effect of taper adjustment and wire tightening adjustment can be considered at the same time, more accurate and more complex cutting shapes can be achieved, and the cutting efficiency is improved. And the cutting diversity and flexibility are improved.

Description

Technical Field

[0001] The utility model relates to wire cutting equipment, in particular to a long-stroke electric spark wire cutting machine tool with a cutting section wire tightening structure. Background Art

[0002] Patent document CN211192381U discloses a wire tightening mechanism for a reciprocating wire-cut electric discharge machine, which includes a wire feeding assembly, a lower wire rack, an upper wire rack, a tapered head assembly, a wire rack head, a bilateral guide wheel assembly, a conductive block assembly, a weight, a weight slider, a locking screw, a weight counterweight, a first hexagon socket bolt, a unilateral guide wheel assembly, a second hexagon socket bolt and a wire. An upper wire rack and a lower wire rack are sequentially arranged on one side of the wire feeding assembly from top to bottom. A wire rack head is arranged on the side of the upper wire rack away from the wire feeding assembly. The wire rack head and the upper wire rack are fixedly installed through the tapered head assembly. A weight slider is arranged on the side of the upper wire rack close to the wire feeding assembly, so that the molybdenum wire maintains tension during the cutting process, effectively solving the problem of unilateral loose wire during the operation of the reciprocating wire-cut electric discharge machine. However, the wire tensioning mechanism of this type of wire-cutting machine is located near the wire storage drum, far from the contact point between the molybdenum wire and the workpiece. Because the molybdenum wire has a certain degree of elasticity, the tension gradually decreases as it reaches the workpiece, causing the molybdenum wire to still bend slightly during the cutting process, affecting cutting accuracy. Therefore, it is necessary to optimize the structure of this type of cutting machine to overcome the above-mentioned drawbacks. Utility Model Content

[0003] The utility model aims to provide a long-stroke electric spark wire cutting machine tool with a cutting section wire tightening structure.

[0004] The technical solution adopted by the present invention to solve its technical problems is:

[0005] A long-stroke wire-cut electric discharge machine with a cutting segment wire-tightening structure includes a winding assembly, a taper assembly, and a wire rewind assembly. The molybdenum wire in the winding assembly is output through the taper assembly and recovered from the wire rewind assembly to the winding assembly. The molybdenum wire forms a cutting segment in the section between the taper assembly and the wire rewind assembly. The taper assembly adjusts the taper of the cutting segment, and the cutting segment cuts the workpiece. The machine also includes:

[0006] The wire tightening assembly is installed on the taper assembly and is close to the cutting section. The molybdenum wire output from the winding assembly passes through the wire tightening assembly and is tensioned by the wire tightening assembly.

[0007] Specifically, the tightening wire assembly includes:

[0008] The tightening wire seat body is installed on the taper assembly through a connector and is close to the cutting section. The position of the tightening wire seat body can be adjusted together with the taper assembly.

[0009] The fixed wheel group is installed on the tightening wire seat body and can rotate on the tightening wire seat body. The molybdenum wire output from the winding and unwinding assembly passes through the fixed wheel group and is guided by the fixed wheel group.

[0010] A movable bracket is mounted on the tightening seat body through a movable connection structure and corresponds to the position of the fixed wheel set. The movable bracket can move on the tightening seat body to approach or move away from the fixed wheel set. An elastic member is provided between the movable bracket and the tightening seat body, and the elastic member applies elastic force to the movable bracket to move it away from the fixed wheel set.

[0011] The movable guide wheel is installed on the movable bracket and can move with the movable bracket. The molybdenum wire in the fixed wheel group can pass through the movable guide wheel. The movable guide wheel applies tension to the molybdenum wire, so that its cutting section is in a tensioned state.

[0012] Fixed wheel set includes:

[0013] The inlet guide wheel is installed on the side wall of the tensioning seat through the rotating shaft. It corresponds to the position of the winding assembly. The molybdenum wire output from the winding assembly passes around the inlet guide wheel and is guided by the inlet guide wheel.

[0014] The outlet guide wheel is installed on the side wall of the wire tightening seat through a rotating shaft and corresponds to the position of the wire rewind assembly. There is a gap between the inlet guide wheel and the outlet guide wheel. The molybdenum wire output from the inlet guide wheel passes around the outlet guide wheel and is guided by the outlet guide wheel. The molybdenum wire output from the outlet guide wheel enters the wire rewind assembly.

[0015] The movable bracket includes:

[0016] The assembly seat body is provided with a pair of assembly seat bodies, each assembly seat body is respectively mounted on the side wall of the tightening seat body by connecting bolts and corresponds to the position of the fixed wheel group; in one embodiment of the present utility model, the assembly seat body is located between the inlet guide wheel and the outlet guide wheel;

[0017] A pair of support guide rods are provided, each end of which is engaged with the assembly base, and the two support guide rods are parallel to each other and extend away from the fixed wheel assembly. In one embodiment of the present invention, the center line between the inlet guide wheel and the outlet guide wheel is perpendicular to the axis of the support guide rods;

[0018] The movable support block is located between the support guide rods. Both ends of the movable support block are mounted on the support guide rods through sliding sleeves. The movable support block can move along the support guide rods to approach or move away from the fixed wheel set. The movable guide wheel is mounted on the movable support block through a rotating shaft. The movable support block can rotate on the movable support block and move with the movable support block. The molybdenum wire in the fixed wheel set can pass through the movable guide wheel.

[0019] A pair of tensioning springs are provided, each spring being sleeved onto a support guide rod. One end of each spring abuts against the assembly base, and the other end abuts against the movable support block. The tensioning spring applies elastic force to the movable support block, causing it to carry the movable guide wheel away from the fixed wheel assembly, thereby applying tension to the molybdenum wire. In one embodiment of the present invention, the molybdenum wire output from the inlet guide wheel is wound around the movable guide wheel and then around the outlet guide wheel, thereby applying tension to the wire.

[0020] The taper assembly also has a limiting plate with a wire guide hole. The molybdenum wire output from the outlet guide wheel passes through the wire guide hole and then enters the wire return assembly, forming a cutting section between the wire guide hole and the wire return assembly.

[0021] The movable support block is also provided with a positioning end column, which extends toward the assembly seat body and has a positioning notch at its end. The assembly seat body is provided with an avoidance opening adapted to the positioning end column.

[0022] A positioning locking rod is also provided in the assembly seat body. The positioning locking rod extends into the assembly seat body through a sliding hole, and its end is bent to one side and extends into the avoidance opening. When the end of the positioning end column extends into the avoidance opening, the end of the positioning locking rod abuts against the positioning recess, and the positioning locking rod positions the positioning end column and the movable support block, so that the position of the movable support block is fixed, which facilitates the disassembly and assembly of the molybdenum wire on the movable guide wheel.

[0023] A return spring is sleeved on the positioning lock rod, one end of the return spring abuts against the assembly seat body, and the other end abuts against the top of the positioning lock rod. The return spring applies elastic force to the positioning lock rod to make it abut against the positioning end column.

[0024] The advantages of the present invention are:

[0025] The wire cutting machine tool installs the wire tensioning assembly on the taper assembly and places it close to the cutting section of the molybdenum wire. Since the wire tensioning assembly acts directly near the cutting section, it can control the state of the cutting section more directly and effectively, so that the molybdenum wire maintains appropriate tension during the cutting process, ensuring the accuracy and consistency of the cutting trajectory, thereby improving the cutting accuracy. The wire tensioning assembly can keep the molybdenum wire in the optimal tensioning state, thereby extending its service life and reducing the reduction in cutting accuracy caused by molybdenum wire wear. The wire tensioning assembly adjusts its position together with the taper assembly, which makes it possible to take into account the tensioning state of the molybdenum wire when adjusting the taper. The synergistic effect of taper adjustment and wire tensioning adjustment helps to achieve more precise and complex cutting shapes, and improves the diversity and flexibility of cutting. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural diagram of a long-stroke wire-cut electric discharge machine tool with a cutting section wire-tightening structure proposed by the present invention;

[0027] Figure 2It is a structural diagram of the tight wire assembly;

[0028] Figure 3 It is a schematic diagram of the assembly state of the positioning lock rod. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model for protection, but merely represents selected embodiments of the present invention. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] like Figures 1 to 3 As shown, the long-stroke electric spark wire cutting machine with a cutting section wire tightening structure proposed by the utility model includes a winding assembly 100, a taper assembly 200 and a wire rewind assembly 300. The molybdenum wire in the winding assembly is output through the taper assembly and recovered from the wire rewind assembly to the winding assembly. The molybdenum wire forms a cutting section in the section between the taper assembly and the wire rewind assembly. The taper assembly adjusts the taper of the cutting section, and the cutting section cuts the workpiece. It also includes a wire tightening assembly 400. The wire tightening assembly is installed on the taper assembly and is close to the cutting section. The molybdenum wire output from the winding assembly passes through the wire tightening assembly and is tightened by the wire tightening assembly.

[0031] In this embodiment, the wire tightening assembly includes a wire tightening seat body 410, a fixed wheel group 420, a movable bracket 430 and a movable guide wheel 440. The wire tightening seat body is installed on the taper assembly through a connecting piece and is close to the cutting section. The position can be adjusted together with the taper assembly. The fixed wheel group is installed on the wire tightening seat body and can rotate on the wire tightening seat body. The molybdenum wire output from the winding assembly passes through the fixed wheel group, and the fixed wheel group guides the molybdenum wire. The movable bracket is installed on the wire tightening seat body through a movable connection structure and corresponds to the position of the fixed wheel group. It can move on the wire tightening seat body to approach or move away from the fixed wheel group. An elastic member is provided between the movable bracket and the wire tightening seat body, and the elastic member applies elastic force to the movable bracket to make it move away from the fixed wheel group. The movable guide wheel is installed on the movable bracket and can move together with the movable bracket. The molybdenum wire in the fixed wheel group can pass through the movable guide wheel, and the movable guide wheel applies tensioning force to the molybdenum wire to put its cutting section in a tensioned state.

[0032] The fixed wheel group includes an inlet guide wheel 421 and an outlet guide wheel 422. The inlet guide wheel is installed on the side wall of the wire tightening seat through a rotating shaft, and corresponds to the position of the winding assembly. The molybdenum wire output from the winding assembly passes around the inlet guide wheel and is guided by the inlet guide wheel. The outlet guide wheel is installed on the side wall of the wire tightening seat through a rotating shaft, and corresponds to the position of the wire rewinding assembly. There is a gap between the inlet guide wheel and the outlet guide wheel. The molybdenum wire output from the inlet guide wheel passes around the outlet guide wheel and is guided by the outlet guide wheel. The molybdenum wire output from the outlet guide wheel enters the wire rewinding assembly.

[0033] The movable bracket includes an assembly seat body 431, a support guide rod 432, a movable support block 433 and a tensioning spring (not shown in the figure). A pair of assembly seat bodies are provided, and each assembly seat body is respectively installed on the side wall of the tightening seat body through a connecting bolt, and corresponds to the position of the fixed wheel group; in this embodiment, the assembly seat body is located between the inlet guide wheel and the outlet guide wheel, and a pair of support guide rods are provided, and the two ends of each support guide rod are respectively engaged with the assembly seat body, which are parallel to each other and extend in the direction away from the fixed wheel group. In this embodiment, the centerline connecting the inlet guide wheel and the outlet guide wheel is perpendicular to the axis of the support guide rods. A movable support block is positioned between the support guide rods, with its ends mounted on the support guide rods via sliding sleeves. The movable support block can move along the support guide rods to approach or move away from the fixed wheel assembly. The movable guide wheel is mounted on the movable support block via a rotating shaft, can rotate on the movable support block, and can move with the movable support block. The molybdenum wire in the fixed wheel assembly can pass through the movable guide wheel. A pair of tensioning springs are provided, each of which is sleeved on the support guide rods, one end of which abuts the assembly base and the other end abuts the movable support block. The tensioning springs apply an elastic force to the movable support block, causing it to carry the movable guide wheel away from the fixed wheel assembly, thereby applying tension to the molybdenum wire. In this embodiment, the molybdenum wire output from the inlet guide wheel is passed around the movable guide wheel and then around the outlet guide wheel, thereby applying tension to the molybdenum wire.

[0034] The taper assembly also has a limiting plate with a wire guide hole. The molybdenum wire output from the outlet guide wheel passes through the wire guide hole and then enters the wire return assembly, forming a cutting section between the wire guide hole and the wire return assembly.

[0035] The movable support block is further provided with a positioning end post 434, which extends toward the assembly base body and has a positioning notch at its end. The assembly base body is provided with a position avoidance opening 4311 adapted to the positioning end post.

[0036] A positioning lock rod 435 is also provided in the assembly seat body. The positioning lock rod extends into the assembly seat body through a sliding hole, and its end is bent to one side and extends into the avoidance opening. When the end of the positioning end column extends into the avoidance opening, the end of the positioning lock rod abuts against the positioning recess, and the positioning lock rod positions the positioning end column and the movable support block, so that the position of the movable support block is fixed, which facilitates the disassembly and assembly of the molybdenum wire on the movable guide wheel.

[0037] A return spring 4351 is sleeved on the positioning lock rod, one end of which is in contact with the assembly seat, and the other end is in contact with the top of the positioning lock rod. The return spring applies elastic force to the positioning lock rod to make it contact with the positioning end column.

[0038] In the description of the present utility model, it should be noted that when terms such as "upper", "lower", "inner", "outer", "left", and "right" indicate an orientation or positional relationship, they should be understood as being based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present utility model. In addition, when terms such as "first" and "second" appear, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance. In the description of the present utility model, it should also be noted that, unless otherwise clearly specified and limited, terms such as "installation", "setting", and "connection" should be understood in a broad sense. For example, "connection" 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 a direct connection, an indirect connection through an intermediate medium, or it can be a communication between the internal parts of two elements. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

Claims

1. A long-stroke wire-cut electric discharge machine with a cutting segment wire-tightening structure, comprising a winding assembly, a taper assembly, and a wire rewind assembly. The molybdenum wire in the winding assembly is output through the taper assembly and recovered from the wire rewind assembly to the winding assembly. The molybdenum wire forms a cutting segment between the taper assembly and the wire rewind assembly. The taper assembly adjusts the taper of the cutting segment, and the cutting segment cuts the workpiece. The invention is characterized in that: Also includes: The wire tightening assembly is installed on the taper assembly and is close to the cutting section. The molybdenum wire output from the winding assembly passes through the wire tightening assembly and is tensioned by the wire tightening assembly.

2. A long-stroke wire-cut electric discharge machine with a cutting section tight wire structure according to claim 1, characterized in that: The tightening wire assembly includes: The tightening wire seat body is installed on the taper assembly through a connector and is close to the cutting section. The position of the tightening wire seat body can be adjusted together with the taper assembly. The fixed wheel group is installed on the tightening wire seat body and can rotate on the tightening wire seat body. The molybdenum wire output from the winding and unwinding assembly passes through the fixed wheel group and is guided by the fixed wheel group. A movable bracket is mounted on the tightening seat body through a movable connection structure and corresponds to the position of the fixed wheel set. The movable bracket can move on the tightening seat body to approach or move away from the fixed wheel set. An elastic member is provided between the movable bracket and the tightening seat body, and the elastic member applies elastic force to the movable bracket to move it away from the fixed wheel set. The movable guide wheel is installed on the movable bracket and can move with the movable bracket. The molybdenum wire in the fixed wheel group can pass through the movable guide wheel. The movable guide wheel applies tension to the molybdenum wire, so that its cutting section is in a tensioned state.

3. A long-stroke wire-cut electric discharge machine with a cutting section tight wire structure according to claim 2, characterized in that: Fixed wheel set includes: The inlet guide wheel is installed on the side wall of the tensioning seat through the rotating shaft. It corresponds to the position of the winding assembly. The molybdenum wire output from the winding assembly passes around the inlet guide wheel and is guided by the inlet guide wheel. The outlet guide wheel is installed on the side wall of the wire tightening seat through a rotating shaft and corresponds to the position of the wire rewind assembly. There is a gap between the inlet guide wheel and the outlet guide wheel. The molybdenum wire output from the inlet guide wheel passes around the outlet guide wheel and is guided by the outlet guide wheel. The molybdenum wire output from the outlet guide wheel enters the wire rewind assembly.

4. The long-stroke wire-cut electric discharge machine with a cutting section tight wire structure according to claim 2, characterized in that: The movable bracket includes: The assembly seat body is provided with a pair of assembly seat bodies, each assembly seat body is respectively installed on the side wall of the tightening seat body by connecting bolts and corresponds to the position of the fixed wheel group; the assembly seat body is located between the inlet guide wheel and the outlet guide wheel; A pair of support guide rods are provided, each end of which is engaged with the assembly base, and the two ends of the support guide rods are parallel to each other and extend in a direction away from the fixed wheel set; the center line between the inlet guide wheel and the outlet guide wheel is perpendicular to the axis of the support guide rods; The movable support block is located between the support guide rods. Both ends of the movable support block are mounted on the support guide rods through sliding sleeves. The movable support block can move along the support guide rods to approach or move away from the fixed wheel set. The movable guide wheel is mounted on the movable support block through a rotating shaft. The movable support block can rotate on the movable support block and move with the movable support block. The molybdenum wire in the fixed wheel set can pass through the movable guide wheel. A pair of tensioning springs are provided, each tensioning spring is respectively sleeved on the supporting guide rod, one end of which is in contact with the assembly seat body, and the other end is in contact with the movable support block. The tensioning spring applies elastic force to the movable support block, so that it carries the movable guide wheel away from the fixed wheel group, and the movable guide wheel applies tensioning force to the molybdenum wire. The molybdenum wire output from the inlet guide wheel passes around the movable guide wheel and then around the outlet guide wheel, so that it obtains tensioning force.

5. The long-stroke wire-cut electric discharge machine with a cutting section tight wire structure according to claim 3, characterized in that: The taper assembly also has a limiting plate with a wire guide hole. The molybdenum wire output from the outlet guide wheel passes through the wire guide hole and then enters the wire return assembly, forming a cutting section between the wire guide hole and the wire return assembly.

6. The long-stroke wire-cut electric discharge machine with a cutting section tight wire structure according to claim 4, characterized in that: The movable support block is also provided with a positioning end column, which extends toward the assembly seat body and has a positioning notch at its end. The assembly seat body is provided with an avoidance opening adapted to the positioning end column. A positioning locking rod is also provided in the assembly seat body. The positioning locking rod extends into the assembly seat body through a sliding hole, and its end is bent to one side and extends into the avoidance opening. When the end of the positioning end column extends into the avoidance opening, the end of the positioning locking rod abuts against the positioning recess, and the positioning locking rod positions the positioning end column and the movable support block, so that the position of the movable support block is fixed, which facilitates the disassembly and assembly of the molybdenum wire on the movable guide wheel.

7. The long-stroke wire-cut electric discharge machine with a cutting section wire-tightening structure according to claim 6, characterized in that: A return spring is sleeved on the positioning lock rod, one end of the return spring abuts against the assembly seat body, and the other end abuts against the top of the positioning lock rod. The return spring applies elastic force to the positioning lock rod to make it abut against the positioning end column.

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