Inner hole machining method of medium-speed wire cut electric discharge machine

Abstract

The invention provides an inner hole machining method for a medium-speed wire cut electric discharge machine, and belongs to the technical field of medium-speed wire cutting. The inner hole machining method comprises the following steps that S1, a wire penetrating hole is machined in a workpiece in advance; s2, firstly, a molybdenum wire penetrates through the wire penetrating hole, then an inner hole is roughly cut, meanwhile, a guiding part protruding towards the center of the hole is reserved in the inner hole, and a guiding hole is formed in the guiding part; s3, waste materials are removed after wire drawing, then a molybdenum wire penetrates through the guide hole, then finish machining is conducted on the inner hole, and meanwhile the guide part is cut off; according to the machining method, when the inner hole is roughly machined in the workpiece, the guide hole is reserved so that secondary wire penetrating can be conveniently conducted on the inner hole for finish machining, and by means of the machining method, it is avoided that the distance between the upper machining arm and the lower machining arm of the medium-speed wire cut electric discharge machine is increased, so that the height of the whole equipment is reduced, and meanwhile the structure of the equipment is simplified; and the cost of the equipment is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of medium-speed wire cutting, and in particular to an inner hole processing method of a medium-speed wire electric spark wire cutting machine. Background Art

[0002] Medium-speed wire EDM is a widely used equipment in the metal processing industry. It is between high-speed wire EDM and low-speed wire EDM, and has the advantages of both. It is suitable for the processing of precision parts and complex-shaped workpieces. Its main features include high processing accuracy and good surface quality, especially in the automotive mold, electronic components and other industries. In addition, the medium-speed wire has a low operating cost and a high cost-effectiveness, and can flexibly process various difficult-to-cut materials, such as cemented carbide and high-temperature alloys.

[0003] At present, when a medium-speed wire EDM machine processes an inner hole on a workpiece, it first pre-processes a wire hole on the workpiece, and then cuts the required inner hole by threading the wire again, then draws the wire to remove the waste material, and then threads the wire a second time to repair the knife. Since there is a small diameter threading hole to assist in threading during the first threading, the molybdenum wire can smoothly pass through the workpiece from the upper processing arm to the lower processing arm. However, during the second threading, since a larger inner hole has been processed, the molybdenum wire cannot be positioned during threading, which greatly increases the difficulty of threading. The current solution is to insert a liftable wire guide tube into the inner hole to assist in threading, but this structure widens the distance between the upper processing arm and the lower processing arm, thereby increasing the height of the entire equipment, while also complicating the structure of the equipment and increasing the cost of the equipment. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to provide a method for inner hole machining of a medium-speed wire electric spark wire cutting machine.

[0005] The technical solution adopted by the present invention is as follows: The present application provides a method for inner hole machining of a medium-speed wire electric spark wire cutting machine, comprising the following steps:

[0006] Step S1: pre-processing a threading hole on the workpiece;

[0007] Step S2: Firstly, the molybdenum wire is passed through the wire threading hole, and then the inner hole is roughly cut out, and at the same time, a guide portion protruding toward the center of the hole is reserved in the inner hole, and a guide hole is provided on the guide portion;

[0008] Step S3: After wire drawing, the waste is removed, and the molybdenum wire is passed through the guide hole, and then the inner hole is finely processed and the guide part is cut off at the same time.

[0009] The diameter of the guide hole is 0.5mm-3mm.

[0010] In step S2, an L-shaped cutting channel is formed on the guide portion, and the cutting channel connects the inner hole and the guide hole.

[0011] The cutting channel is flush with the inner wall of the inner hole and passes through the A side of the guide portion.

[0012] In step S3, the cutting is first performed along the direction of the opposite side of the A side, and then the inner wall of the inner hole is finely processed, wherein the molybdenum wire is also finely processed at the cutting position of the guide part and the workpiece.

[0013] There are two guide parts, which are symmetrically arranged around the center of the inner hole.

[0014] The guide hole and the wire threading hole are the same hole.

[0015] The beneficial effects of the present invention are as follows: in the present invention, when rough-machining the inner hole on the workpiece, a guide hole is reserved to facilitate secondary wire threading to perform fine machining of the inner hole. This processing method avoids increasing the distance between the upper processing arm and the lower processing arm of the medium-wire electric spark wire cutting machine, thereby reducing the height of the entire equipment. At the same time, it also simplifies the structure of the equipment, reduces the cost of the equipment, and improves the processing efficiency and processing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0017] Figure 1 It is a schematic diagram of a medium-speed wire electric spark cutting machine in the present invention;

[0018] Figure 2 is a schematic diagram of workpiece processing in the present invention;

[0019] Figure 3 for Figure 2 The enlarged view of point B in the middle;

[0020] Figure 4 A schematic diagram of the workpiece state of the inner hole processing method of the present invention;

[0021] Figure 5 It is a flow chart of the inner hole processing method in the present invention. DETAILED DESCRIPTION

[0022] The following description provides specific application scenarios and requirements of this specification, with the purpose of enabling those skilled in the art to make and use the contents of this specification. Various local modifications to the disclosed embodiments will be apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of this specification. Therefore, this specification is not limited to the embodiments shown, but to the widest scope consistent with the claims.

[0023] In the description of the present application, it should be noted that, unless otherwise expressly specified and limited, the terms "longitudinal", "transverse", "radial", "length", "width", "thickness", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0024] Secondly, the terms "first", "second" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different components and should not be understood as limitations on the embodiments of the present application.

[0025] In addition, the terms "installed", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements or components.

[0026] For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] Regarding the drawings of the present application, it should be clearly understood that the drawings are for illustration and description purposes only and are not intended to limit the scope of the present specification. It should also be understood that the drawings are not drawn to scale.

[0028] Embodiment 1:

[0029] like Figures 1 to 5 As shown, this embodiment provides an inner hole processing method of a medium-speed wire electric spark wire cutting machine. The medium-speed wire electric spark wire cutting machine adopts a device commonly used in the field, and generally has functions such as automatic wire threading and wire drawing.

[0030] The method comprises the following steps:

[0031] Step S1: pre-processing a threading hole 10 on the workpiece 1, which is generally 0.3 mm to 3 mm, usually using a punching machine for processing.

[0032] Step S2: First, pass the molybdenum wire through the wire threading hole 10. It should be understood that the automatic wire threading mechanism on the medium-wire EDM wire cutting machine can pass the molybdenum wire through the wire nozzle of the upper processing arm, and at the same time pass through the wire threading hole 10 and be collected by the wire nozzle of the lower processing arm, and then roughly cut the required inner hole 11 along a certain trajectory. At the same time, a guide portion 12 protruding toward the center of the hole is reserved in the inner hole 11, and a guide hole 13 is provided on the guide portion 12. Preferably, the guide hole 13 and the wire threading hole 10 are the same hole, so there is no need to cut the guide hole 13, thereby saving processing time.

[0033] Step S3: Removing waste after wire drawing. It should be understood that the wire drawing mechanism on the medium-speed wire EDM wire cutting machine can draw the molybdenum wire from the inner hole 11 to facilitate the removal of waste, and then pass the molybdenum wire through the guide hole 13, and then fine-process the inner hole 11, and at the same time cut off the guide part 12.

[0034] By this method, when the inner hole 11 is roughly processed on the workpiece, a guide hole 13 is reserved to facilitate the secondary wire threading to perform fine processing on the inner hole 11, thereby avoiding an increase in the distance between the upper processing arm and the lower processing arm of the medium-wire EDM wire cutting machine, thereby reducing the height of the entire equipment, simplifying the structure of the equipment, and reducing the cost of the equipment.

[0035] Secondly, after the molybdenum wire is roughly processed into the inner hole 11, it stays in the guide hole 13. With the isolation of the guide part 12, for some easily accessible waste materials, there is no need to draw the wire and then thread it, which greatly saves the processing time.

[0036] The diameter of the guide hole 13 is 0.5 mm-3 mm, and preferably, the diameter of the guide hole 13 is 2 mm.

[0037] In the disclosed embodiment, in step S2, an L-shaped cutting channel 14 is formed on the guide portion 12, and the cutting channel 14 connects the inner hole 11 and the guide hole 13. The cutting channel 14 is formed when the molybdenum wire is cut.

[0038] Preferably, the cutting channel 14 is flush with the inner wall of the inner hole 11 and passes through the A side of the guide portion 12. Figure 3 As shown, side A is the right side. It should be understood that it can also run through the left side. Through this arrangement, less movement is required when cutting the molybdenum wire, thereby reducing the consumption of the molybdenum wire.

[0039] Secondly, in step S3, the cutting is first performed along the opposite side of side A, and then the inner wall of the inner hole 11 is finely processed, wherein the molybdenum wire also finely processes the incision position C of the guide portion 12 and the workpiece. This greatly shortens the distance that the molybdenum wire needs to move when fine-processing the inner hole 11, and in particular, the incision position C can also be fine-processed, thereby improving the processing quality of the inner hole.

[0040] Furthermore, there are two guide parts 12, and they are symmetrically arranged around the center of the inner hole 11, so that two finishing processes can be achieved, improving the processing quality of the inner hole. At the same time, the workpiece only needs to be rotated around the center of the inner hole 11 to avoid repeated alignment and shorten the processing time.

[0041] In summary, after reading this detailed disclosure, those skilled in the art will appreciate that the foregoing detailed disclosure may be presented only by way of example and may not be restrictive. Although not explicitly stated herein, those skilled in the art will appreciate that the requirements of this application encompass various reasonable changes, improvements and modifications to the embodiments. These changes, improvements and modifications are intended to be proposed by the present application and are within the spirit and scope of the exemplary embodiments of the present application.

[0042] In addition, it should be understood that in the foregoing description of the embodiments of the present application, in order to help understand a feature and for the purpose of simplifying the present application, the present application combines various features in a single embodiment, drawing or its description. However, this does not mean that the combination of these features is necessary. When reading the present application, it is entirely possible for a person skilled in the art to mark out a part of the devices as a separate embodiment. In other words, the embodiments in the present application can also be understood as the integration of multiple secondary embodiments. This is also true when the content of each secondary embodiment is less than all the features of a single aforementioned disclosed embodiment.

[0043] Finally, it should be understood that the embodiments of the application disclosed herein are explanations of the principles of the embodiments of the present application. Other modified embodiments are also within the scope of the present application. Therefore, the embodiments disclosed in the present application are merely examples and not limitations. Those skilled in the art can adopt alternative configurations according to the embodiments in the present application to implement the application in the present application. Therefore, the embodiments of the present application are not limited to the embodiments accurately described in the application.

Claims

1. A method for inner hole machining of a medium-speed wire electric spark cutting machine, characterized in that: The steps include: Step S1: pre-processing a threading hole on the workpiece; Step S2: Firstly, the molybdenum wire is passed through the wire threading hole, and then the inner hole is roughly cut out, and at the same time, a guide portion protruding toward the center of the hole is reserved in the inner hole, and a guide hole is provided on the guide portion; Step S3: After wire drawing, the waste is removed, and the molybdenum wire is passed through the guide hole, and then the inner hole is finely processed and the guide part is cut off at the same time.

2. The inner hole processing method of a medium-speed wire electric spark cutting machine according to claim 1 is characterized in that: The diameter of the guide hole is 0.5mm-3mm.

3. The inner hole processing method of a medium-speed wire electric spark wire cutting machine according to claim 1 is characterized in that: In step S2, an L-shaped cutting channel is formed on the guide portion, and the cutting channel connects the inner hole and the guide hole.

4. The inner hole processing method of a medium-speed wire electric spark wire cutting machine according to claim 3 is characterized in that: The cutting channel is flush with the inner wall of the inner hole and passes through the A side of the guide portion.

5. The inner hole processing method of a medium-speed wire electric spark cutting machine according to claim 4 is characterized in that: In step S3, the cutting is first performed along the direction of the opposite side of the A side, and then the inner wall of the inner hole is finely processed, wherein the molybdenum wire is also finely processed at the cutting position of the guide part and the workpiece.

6. The inner hole processing method of a medium-speed wire electric spark cutting machine according to claim 1 is characterized in that: There are two guide parts, which are symmetrically arranged around the center of the inner hole.

7. The inner hole processing method of a medium-speed wire electric spark cutting machine according to claim 1 is characterized in that: The guide hole and the wire threading hole are the same hole.

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