Machining method for small-diameter linear cutting wire penetrating hole

Abstract

The invention provides a machining method for a small-diameter wire-electrode cutting threading hole, which comprises the following steps of: roughly turning an electrode blank to obtain a small-diameter end, and machining an arc at the joint of the small-diameter end and the electrode blank; a reverse copying electrode method is adopted, a hard alloy sample block is utilized, the small-diameter end of the electrode blank is machined on a machine tool in a multi-stage small-feeding mode, and an electrode tip used for machining a wire penetrating hole is obtained; and after the electrode blank is machined, the electrode blank is not disassembled, and a part needing to be machined is clamped on the machine tool for alignment machining of the wire penetrating hole. According to the machining method for the small-diameter wire cutting wire penetrating hole, the wire cutting wire penetrating hole with the diameter phi smaller than 0.1 mm is machined by preparing an electrode of a specific structure, an electric spark device is adopted for clamping the electrode to conduct electric discharge machining on a hard alloy sample block, and a small-diameter electrode is prepared in a discharge loss mode of the electric spark device; therefore, the machining problem of the wire-electrode cutting threading hole with the diameter being smaller than phi 0.1 mm is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of general manufacturing of mechanical processing, and in particular relates to a processing method for a small-diameter wire cutting threading hole. Background Art

[0002] In the aerospace field, some pneumatic and hydraulic servo motor products contain precise tiny square grooves or special-shaped groove structures for flow control. The minimum groove width of such micro grooves is generally not more than 0.2mm, and the corners at the intersection of the edges are R0.05mm-R0.1mm. To process such groove structures, high-precision small-wire diameter wire cutting equipment is generally required for discharge cutting, and wire cutting holes with a diameter of less than Φ0.1mm must be pre-processed for wire cutting equipment to thread the wire. However, the existing processing methods cannot solve the problem of processing wire cutting holes with a diameter of less than Φ0.1mm, so it is necessary to design a processing method for small-diameter wire cutting holes. Summary of the invention

[0003] In view of this, the present invention aims to propose a method for processing small-diameter wire cutting wire holes to solve the processing problem of wire cutting wire holes below Φ0.1mm.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] A method for processing a small-diameter wire cutting threading hole, comprising:

[0006] Rough turning is performed on the electrode blank to obtain a small diameter end, and an arc is machined at the connection between the small diameter end and the electrode blank;

[0007] The reverse electrode method is adopted, and the small diameter end of the electrode blank is processed on the machine tool by using a hard alloy sample through a multi-stage small feed method to obtain the electrode tip for processing the threading hole; wherein, the feed amount of each multi-stage small feed is 0.01mm-0.02mm;

[0008] After the electrode blank is processed, it is not disassembled, and the parts to be processed are clamped on the machine tool to align and process the threading holes.

[0009] Furthermore, the arc is R2-R3.

[0010] Furthermore, when the small diameter end is obtained by rough turning on the electrode blank and an arc is machined at the connection between the small diameter end and the electrode blank, the coaxiality between the small diameter end and the clamping end of the electrode blank is controlled to be no greater than 0.1 mm.

[0011] Furthermore, the cemented carbide sample block adopts a tungsten-cobalt cemented carbide block.

[0012] Furthermore, the flatness of the cemented carbide sample does not exceed 0.005 mm.

[0013] Furthermore, the reverse electrode method is used, and a carbide sample is used to process the small diameter end of the electrode blank on a machine tool by multi-stage small feed to obtain the electrode tip for processing the threading hole; wherein the feed amount of each multi-stage small feed is 0.01mm-0.02mm, including:

[0014] The reverse electrode method is adopted, and the carbide sample is used. The C-axis rotation of the EDM equipment is set on the machine tool, and the X-axis moves at a constant speed to consume the diameter of the small diameter end of the electrode blank;

[0015] The small diameter end of the electrode blank is processed by a four-stage small feed method to obtain the electrode tip for processing the wire threading hole, and the feed amount each time is 0.01mm-0.02mm; the first stage is divided into at least three small feeds, the second stage is divided into at least four small feeds, the third stage is divided into at least two small feeds, and the fourth stage is divided into at least three small feeds.

[0016] Furthermore, the four-stage small feed includes:

[0017] The parameters of each small feed in the first stage are: average discharge current 20-25A, pulse width 22-25us, pulse interval 90-100us, tightening speed 400-450mm / min, C-axis rotation 80-100r / min;

[0018] The parameters of each small feed in the second stage are: average discharge current 15-20A, pulse width 10-15us, pulse interval 60-80us, tightening speed 400-450mm / min, C-axis rotation 80-100r / min;

[0019] The parameters of each small feed in the three stages are: average discharge current 3-4A, pulse width 6-8us, pulse interval 6-10us, tightening speed 800-1000mm / min, C-axis rotation 150-200r / min;

[0020] The parameters of each small feed in the four stages are: average discharge current 1-3A, pulse width 2-4us, pulse interval 6-10us, tightening speed 800-1000mm / min, C-axis rotation 150-200r / min.

[0021] Furthermore, the electrode blank is not disassembled after processing, and the parts to be processed are clamped on the machine tool for alignment and processing of threading holes, including:

[0022] After the electrode blank is processed, it is not disassembled, and the parts to be processed are clamped on the machine tool for alignment;

[0023] The C-axis of the electric spark device is set to rotate, and the electrode tip of the electrode blank is used to process the threading hole on the part to be processed.

[0024] Compared with the prior art, the method for processing a small-diameter wire cutting threading hole described in the present invention has the following advantages:

[0025] The invention discloses a method for processing a small-diameter wire cutting threading hole. The method processes a wire cutting threading hole with a diameter of less than Φ0.1 mm by preparing an electrode with a specific structure, and uses an electric spark device to clamp the electrode and discharge a hard alloy sample. The small-diameter electrode is prepared by the electric spark device discharge consumption method, thereby solving the processing problem of wire cutting threading holes with a diameter of less than Φ0.1 mm. The processing method is ingeniously designed, low-cost, simple in process, easy to operate, low in operator skill requirements, and stable in processing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 A schematic flow chart of a method for machining a small-diameter wire cutting threading hole according to an embodiment of the present invention;

[0028] Figure 2 It is a schematic structural diagram of an electrode blank in a method for processing a small-diameter wire cutting threading hole according to an embodiment of the present invention;

[0029] Figure 3 It is a structural schematic diagram of a cemented carbide sample block in a method for machining a small-diameter wire cutting threading hole according to an embodiment of the present invention;

[0030] Figure 4 The present invention is a schematic structural diagram of an electrode tip in a method for machining a small-diameter wire cutting threading hole according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0032] The embodiment of the present invention provides a method for processing a small diameter wire cutting wire hole, which can be applied to the processing of wire cutting wire holes with a diameter of less than Φ0.1 mm. Figure 1 , this processing specifically includes the following steps:

[0033] Step 101, rough turning the electrode blank to obtain a small diameter end, and processing an arc at the connection between the small diameter end and the electrode blank; specifically, the arc is R2-R3.

[0034] Step 102, using the reverse electrode method, using a carbide sample, and processing the small diameter end of the electrode blank on a machine tool through a multi-stage small feed method to obtain an electrode tip for processing a threading hole; wherein the feed amount for each multi-stage small feed is 0.01mm-0.02mm.

[0035] Specifically, the cemented carbide sample block adopts a tungsten-cobalt cemented carbide block, and the flatness of the cemented carbide sample block does not exceed 0.005 mm.

[0036] In actual application, the small diameter end is obtained by rough turning on the electrode blank, and when the arc is processed at the connection between the small diameter end and the electrode blank, the coaxiality between the small diameter end and the clamping end of the electrode blank is controlled to be no more than 0.1 mm.

[0037] Step 103: After the electrode blank is processed, it is not disassembled, and the parts to be processed are clamped on the machine tool to align and process the threading holes.

[0038] Preferably, step 102, using a reverse electrode method, using a carbide sample, and processing the small diameter end of the electrode blank on a machine tool by a multi-stage small feed method to obtain an electrode tip for processing a wire threading hole; wherein the feed amount of each multi-stage small feed is 0.01mm-0.02mm, specifically includes the following steps:

[0039] Step 1021, adopt the reverse electrode copying method, use the carbide sample, set the C-axis rotation of the EDM equipment on the machine tool, and the X-axis uniform movement to consume the diameter of the small diameter end of the electrode blank.

[0040] Step 1022, using a four-stage small feed method to process the small diameter end of the electrode blank to obtain the electrode tip for processing the wire threading hole, with the feed amount of each time being 0.01mm-0.02mm; wherein the first stage is divided into at least three small feeds, the second stage is divided into at least four small feeds, the third stage is divided into at least two small feeds, and the fourth stage is divided into at least three small feeds.

[0041] In actual application, in the above four stages of small feeding, the first stage is divided into three small feedings, the second stage is divided into four small feedings, the third stage is divided into two small feedings, and the fourth stage is divided into three small feedings. Those skilled in the art can also adjust the number of small feedings in each stage according to actual needs. Specifically, the following parameters can be used:

[0042] The parameters of each small feed in the first stage are: average discharge current 20-25A, pulse width 22-25us, pulse gap 90-100us, tightening speed 400-450mm / min, C-axis rotation 80-100r / min. The parameters of each small feed in the second stage are: average discharge current 15-20A, pulse width 10-15us, pulse gap 60-80us, tightening speed 400-450mm / min, C-axis rotation 80-100r / min. The parameters of each small feed in the third stage are: average discharge current 3-4A, pulse width 6-8us, pulse gap 6-10us, tightening speed 800-1000mm / min, C-axis rotation 150-200r / min. The parameters of each small feed in the four stages are: average discharge current 1-3A, pulse width 2-4us, pulse interval 6-10us, tightening speed 800-1000mm / min, C-axis rotation 150-200r / min.

[0043] Preferably, step 103, after the electrode blank is processed, it is not disassembled, and the parts to be processed are clamped on the machine tool to align and process the threading holes, which specifically includes the following steps:

[0044] Step 1031: After the electrode blank is processed, it is not disassembled, and the parts to be processed are clamped on the machine tool for alignment.

[0045] Step 1032, setting the C-axis of the electric spark equipment to rotate, and using the electrode tip of the electrode blank to machine a threading hole on the part to be machined.

[0046] In actual application, taking wire cutting with a processing diameter of less than Φ0.1mm as an example, the electrode tip diameter of the electrode blank needs to be less than Φ0.08mm. Therefore, when using the above processing method, it is necessary to first process the electrode tip diameter of the electrode blank to less than Φ0.08mm.

[0047] The specific processing method can refer to the following steps:

[0048] Step 1: Prepare the electrode blank; the electrode material is generally made of copper-tungsten alloy, and the electrode is rough-turned to Φ0.4mm using a precision slitting machine. To ensure the strength of the electrode, the root connection of the Φ0.4mm outer circle must be processed into an arc of R2-R3. To ensure the clamping positioning accuracy of subsequent processing, the coaxiality between the Φ0.4mm outer circle and the clamping end must be no more than 0.1mm. Figure 2 shown.

[0049] Step 2: Prepare carbide specimens; the material of carbide specimens is generally tungsten-cobalt carbide. To ensure uniform electrode consumption during electrode processing, the flatness of the carbide specimen should not exceed 0.005 mm. Figure 3 shown.

[0050] Step 3: Processing the electrode; the electrode is processed by the reverse electrode method. In order to make the electrode uniformly desized, the C-axis of the EDM equipment must be set to rotate and the X-axis to move at a constant speed to consume the electrode diameter, so as to achieve the purpose of consistent electrode size. Considering that the electrode has a relatively large length-diameter ratio, a multi-stage small feed method is used for processing. The feed amount is generally set to 0.01mm-0.02mm each time. Slow feeding can effectively prevent electrode deformation. The final result is that the electrode tip diameter is less than Φ0.08mm, such as Figure 4 shown.

[0051] Step 4: Process the threading hole; in order to ensure the position accuracy of the threading hole, the electrode is not disassembled after processing, and the required parts are directly clamped on the machine tool for alignment and processing of the threading hole. In order to reduce the electrode wear when processing the threading hole, the C-axis rotation of the EDM equipment must be set, and the threading hole processing is divided into rough processing, semi-finishing, finishing and other multi-stage programs.

[0052] The method for processing small-diameter wire cutting wire holes described in this embodiment is applicable to the processing of wire holes with a diameter of less than Φ0.1mm in all parts with precise tiny square grooves or special-shaped groove structures. Based on the above processing method, technical personnel in this field can also make subtle adjustments to the electrode structure according to the depth of the wire holes in the parts.

[0053] The processing method of the small-diameter wire cutting threading hole described in this embodiment can effectively control the problem of easy deformation of small-diameter electrodes and solve the problem of difficult processing of wire cutting threading holes with a diameter of less than Φ0.1mm by using the above-mentioned electric machining reverse consumption method to process electrodes with a diameter less than Φ0.08mm. This method has high processing accuracy and stable quality. It can be solidified and promoted with the parameters and procedures of the adopted electric machining method, is easy to operate, and the position of the threading hole after processing is accurate and the accuracy is stable.

[0054] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for processing a small diameter wire cutting threading hole, characterized in that: include: Rough turning is performed on the electrode blank to obtain a small diameter end, and an arc is machined at the connection between the small diameter end and the electrode blank; The reverse electrode method is adopted, and the small diameter end of the electrode blank is processed on the machine tool by using a hard alloy sample through a multi-stage small feed method to obtain the electrode tip for processing the threading hole; wherein, the feed amount of each multi-stage small feed is 0.01mm-0.02mm; After the electrode blank is processed, it is not disassembled, and the parts to be processed are clamped on the machine tool to align and process the threading holes.

2. The method according to claim 1, characterized in that: The circular arc is R2-R3.

3. The method according to claim 1, characterized in that: When the small diameter end is obtained by rough turning on the electrode blank and an arc is processed at the connection between the small diameter end and the electrode blank, the coaxiality between the small diameter end and the clamping end of the electrode blank needs to be controlled to be no greater than 0.1 mm.

4. The method according to claim 1, characterized in that: The cemented carbide sample block is a tungsten-cobalt cemented carbide block.

5. The method according to claim 1 or 4, characterized in that: The flatness of the cemented carbide sample does not exceed 0.005 mm.

6. The method according to claim 1, characterized in that The reverse electrode method is adopted, and a carbide sample is used to process the small diameter end of the electrode blank on a machine tool by multi-stage small feed, so as to obtain the electrode tip for processing the threading hole; wherein the feed amount of each multi-stage small feed is 0.01mm-0.02mm, including: The reverse electrode method is adopted, and the carbide sample is used. The C-axis rotation of the EDM equipment is set on the machine tool, and the X-axis moves at a constant speed to consume the diameter of the small diameter end of the electrode blank; The small diameter end of the electrode blank is processed by a four-stage small feed method to obtain the electrode tip for processing the wire threading hole; the first stage is divided into at least three small feeds, the second stage is divided into at least four small feeds, the third stage is divided into at least two small feeds, and the fourth stage is divided into at least three small feeds, and the feed amount of each small feed is 0.01mm-0.02mm.

7. The method according to claim 6, characterized in that The four-stage small feed includes: The parameters of each small feed in the first stage are: average discharge current 20-25A, pulse width 22-25us, pulse interval 90-100us, tightening speed 400-450mm / min, C-axis rotation 80-100r / min; The parameters of each small feed in the second stage are: average discharge current 15-20A, pulse width 10-15us, pulse interval 60-80us, tightening speed 400-450mm / min, C-axis rotation 80-100r / min; The parameters of each small feed in the three stages are: average discharge current 3-4A, pulse width 6-8us, pulse interval 6-10us, tightening speed 800-1000mm / min, C-axis rotation 150-200r / min; The parameters of each small feed in the four stages are: average discharge current 1-3A, pulse width 2-4us, pulse interval 6-10us, tightening speed 800-1000mm / min, C-axis rotation 150-200r / min.

8. The method according to claim 1, characterized in that: After the electrode blank is processed, it is not disassembled, and the parts to be processed are clamped on the machine tool to align and process the threading holes, including: After the electrode blank is processed, it is not disassembled, and the parts to be processed are clamped on the machine tool for alignment; The C-axis of the electric spark device is set to rotate, and the electrode tip of the electrode blank is used to process the threading hole on the part to be processed.

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