A method for sequential machining of splined shafts using short electric arcs

Abstract

This invention discloses a method for sequential short-arc turning of splined shafts, relating to the field of splined shaft machining technology. The invention connects the splined shaft workpiece to the positive terminal of a first power supply and a block electrode to the negative terminal of the same power supply. The splined shaft workpiece is kept rotating at high speed and fed towards the block electrode, completing short-arc turning of the stepped shaft. Then, the workpiece is connected to the positive terminal of a second power supply and a hollow tubular electrode to the negative terminal. The hollow tubular electrode is kept rotating at high speed and fed towards the splined shaft workpiece, completing short-arc milling of the splined shaft. This invention achieves short-arc turning and milling on the same machine tool by changing the power supply and machining electrode. It proposes first using a block electrode for short-arc turning, then replacing it with a hollow tubular electrode for short-arc milling. By combining short-arc turning and milling, efficient and high-quality machining of splined shafts can be achieved.

Description

Technical Field

[0001] This invention relates to the field of spline shaft machining technology, and in particular to a method for machining spline shafts using a short electric arc sequence. Background Technology

[0002] Titanium alloys, nickel-based superalloys, and other materials possess excellent properties such as low density, high strength, corrosion resistance, and good biocompatibility, making them widely used in aerospace, shipbuilding, medical, and other fields. However, splined shafts made from these materials suffer from low elastic modulus and poor thermal conductivity, leading to problems such as high tool costs, severe machining deformation, long machining cycles, and low machining efficiency in traditional turning and milling processes.

[0003] Short arc milling technology utilizes high-speed rotating electrodes to apply voltage between the workpiece and the electrodes, forming an electric arc discharge for machining. It is a non-contact machining process without cutting force stress, and can process conductive materials. It is unaffected by the material's inherent strength, hardness, or other properties, enabling efficient metal machining. It is mainly used in the machining of components such as aero-engine honeycomb parts and aircraft casings.

[0004] Early short-arc turning technology used low-speed workpiece rotation and high-speed electrode rotation to break the arc, resulting in large erosion volume and high processing efficiency. However, it had problems such as poor surface quality and difficulty in removing eroded material. It was mainly used in the processing of large cement grinding rollers and vertical grinding rollers.

[0005] Short-arc machining technology offers advantages such as high machining efficiency and no cutting stress, providing a highly efficient and feasible method for machining splined shafts. How to achieve machining of splined shafts using both methods on the same machine tool is of great significance to the application and development of aerospace technology. Summary of the Invention

[0006] The main objective of this invention is to provide a method for machining spline shafts using a short electric arc sequence, in order to solve the above-mentioned problems.

[0007] To achieve the above objectives, the present invention provides a method for machining splined shafts using a short electric arc sequence, comprising the following steps:

[0008] Step 1: The machine tool spindle clamps the splined shaft workpiece, and the machine tool fixture clamps the block electrode. During operation, the splined shaft workpiece is connected to the positive terminal of the first power supply, and the block electrode is connected to the negative terminal of the first power supply. The splined shaft workpiece maintains high-speed rotation, with a speed of 1000-3000 rpm. The splined shaft workpiece is fed towards the block electrode along the X-axis.

[0009] Step 2: When the spline shaft workpiece is machined to the specified depth by short arc turning, stop feeding along the X-axis and switch to feeding along the Z-axis. Stop the machine when the spline shaft workpiece is machined to the specified length by short arc turning, thus completing the short arc turning of the stepped shaft.

[0010] Step 3: Change the equipment. The machine tool spindle holds the hollow tubular electrode, and the machine tool fixture holds the splined shaft workpiece. During the operation, the splined shaft workpiece is connected to the positive terminal of the second power supply, and the hollow tubular electrode is connected to the negative terminal of the second power supply. The hollow tubular electrode maintains high-speed rotation at a speed of 1000-2000 rpm. The hollow tubular electrode feeds towards the splined shaft workpiece along the Z-axis.

[0011] Step 4: When the hollow tubular electrode is fed to the specified depth, stop feeding along the Z-axis and switch to feeding along the X-axis. Stop the machine when the spline shaft workpiece is machined to the specified length by short arc milling, thus completing the spline short arc milling.

[0012] Furthermore, in step one, the feed rate is 0.4-1 mm / min, and in steps two to four, the feed rate is 10-20 mm / min.

[0013] Furthermore, during the operation, an external water pump is used to spray external flushing fluid to cool and remove erosion materials during short-arc turning and milling processes.

[0014] Furthermore, both the block electrode and the hollow tubular electrode are provided with through holes, which are used to spray internal flushing fluid to cool and remove erosion materials during short arc turning and milling.

[0015] Furthermore, when the machine stops, the spindle resets and stops rotating, the first and second power supplies are turned off, and the external and internal flushing fluids stop spraying.

[0016] The present invention has the following beneficial effects:

[0017] This invention enables short-arc turning and milling on the same machine tool by changing the power supply and machining electrodes. It proposes to first use a block electrode for short-arc turning, and then replace it with a hollow tubular electrode for short-arc milling. By combining short-arc turning and milling, high-efficiency and high-quality machining of spline shafts can be achieved. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the machining process of a short arc sequential machining method for spline shafts according to the present invention.

[0019] Figure 2 This is a schematic diagram of a block electrode for a short-arc sequential machining method for spline shafts according to the present invention.

[0020] Figure 3 This is a schematic diagram of a hollow tubular electrode used in a short-arc sequential machining method for spline shafts according to the present invention.

[0021] Figure 4 This is a schematic diagram of the spline shaft evolution process in the short arc sequential machining method of the present invention.

[0022] Among them, 11-spline shaft workpiece; 12-external water pump; 13-block electrode; 14-through hole; 15-first power supply; 16-second power supply; 17-hollow tubular electrode. Detailed Implementation

[0023] To achieve the above objectives and effects, the technical means and structure adopted by the present invention will be described in detail with reference to the accompanying drawings, focusing on the features and functions of the preferred embodiments of the present invention.

[0024] like Figure 1-4 As shown, this invention provides a method for machining splined shafts using a short electric arc sequence, comprising the following steps:

[0025] Step 1: The machine tool spindle clamps the splined shaft workpiece 11, and the machine tool fixture clamps the block electrode 13. During operation, the splined shaft workpiece 11 is connected to the positive terminal of the first power supply 15, and the block electrode 13 is connected to the negative terminal of the first power supply 15. The splined shaft workpiece 11 maintains high-speed rotation at a speed of 1000-3000 rpm. The splined shaft workpiece is fed towards the block electrode along the X-axis at a feed rate of 0.4-1 mm / min. During operation, the block electrode 13 remains stationary. The high-speed rotation of the splined shaft workpiece 11 facilitates the removal of arc breaks and erosion materials. At the same time, an external water pump 12 is used to spray external flushing fluid, and the through hole 14 of the block electrode 13 is used to spray internal flushing fluid to cool the short arc turning process and remove erosion materials.

[0026] Step 2: When the spline shaft workpiece 11 is machined to the specified depth by short arc turning, stop feeding along the X-axis and switch to feeding along the Z-axis at a feed rate of 10-20 mm / min. Stop the machine when the spline shaft workpiece is machined to the specified length by short arc turning, thus completing the short arc turning of the stepped shaft.

[0027] Step 3: Replacement. Remove the splined shaft workpiece 11 from the machine tool spindle and mount it horizontally on the machine tool fixture. Install the hollow tubular electrode 17 on the machine tool spindle. During operation, the splined shaft workpiece 11 is connected to the positive terminal of the second power supply 16, and the hollow tubular electrode 17 is connected to the negative terminal of the second power supply 16. The hollow tubular electrode 17 maintains high-speed rotation at 1000-2000 rpm. The hollow tubular electrode 17 is fed towards the splined shaft workpiece along the Z-axis at a feed rate of 10-20 mm / min. During operation, the splined shaft workpiece 11 remains stationary. At the same time, an external water pump 12 is used to spray external flushing fluid, and the through hole 14 of the hollow tubular electrode 17 is used to spray internal flushing fluid to cool the short arc turning process and remove erosion materials.

[0028] Step 4: When the hollow tubular electrode reaches the specified depth, stop feeding along the Z-axis and switch to feeding along the X-axis at a speed of 10-20 mm / min. Stop the machine when the spline shaft workpiece has been machined to the specified length by short arc milling, completing the short arc milling of the spline and obtaining a high-quality spline shaft. When stopping the machine, the spindle resets and stops rotating, the first and second power supplies are turned off, and the external and internal flushing fluids stop spraying.

[0029] The entire short arc machining process is completed on the same machine tool. During the machining process, there is no contact between the workpiece and the electrode, so there is no residual stress in the workpiece after machining. This is of great significance for realizing the integrated milling and turning machining of spline shafts using short arc machining.

[0030] The above description is only a preferred embodiment of the present invention and not all embodiments. Anyone should know that structural changes made under the guidance of the present invention, and any technical solutions that are the same as or similar to the present invention, are within the protection scope of the present invention.

Claims

1. A method for sequentially machining a splined shaft using short electric arcs, characterized in that, Includes the following steps: Step 1: The machine tool spindle clamps the splined shaft workpiece, and the machine tool fixture clamps the block electrode. During operation, the splined shaft workpiece is connected to the positive terminal of the first power supply, and the block electrode is connected to the negative terminal of the first power supply. The splined shaft workpiece maintains high-speed rotation, with a speed of 1000-3000 rpm. The splined shaft workpiece is fed towards the block electrode along the X-axis. Step 2: When the spline shaft workpiece is machined to the specified depth by short arc turning, stop feeding along the X-axis and switch to feeding along the Z-axis. Stop the machine when the spline shaft workpiece is machined to the specified length by short arc turning, thus completing the short arc turning of the stepped shaft. Step 3: Change the equipment. The machine tool spindle holds the hollow tubular electrode, and the machine tool fixture holds the splined shaft workpiece. During the operation, the splined shaft workpiece is connected to the positive terminal of the second power supply, and the hollow tubular electrode is connected to the negative terminal of the second power supply. The hollow tubular electrode maintains high-speed rotation at a speed of 1000-2000 rpm. The hollow tubular electrode feeds towards the splined shaft workpiece along the Z-axis. Step 4: When the hollow tubular electrode is fed to the specified depth, stop feeding along the Z-axis and switch to feeding along the X-axis. Stop the machine when the spline shaft workpiece is machined to the specified length by short arc milling, thus completing the spline short arc milling.

2. The method for sequential machining of splined shafts using short electric arcs as described in claim 1, characterized in that, In step one, the feed rate is 0.4-1 mm / min, and in steps two through four, the feed rate is 10-20 mm / min.

3. A method for sequential machining of splined shafts using short electric arcs as described in claim 1 or 2, characterized in that, During operation, an external water pump is used to spray external flushing fluid to cool and remove erosion materials during short-arc turning and milling processes.

4. The method for sequential machining of splined shafts using short electric arcs as described in claim 3, characterized in that, Both the block electrode and the hollow tubular electrode are provided with through holes, which are used to spray internal flushing fluid to cool and remove erosion materials during short arc turning and milling.

5. The method for sequential machining of splined shafts using short electric arcs as described in claim 4, characterized in that, When the machine stops, the spindle resets and stops rotating, the first and second power supplies are turned off, and the external and internal flushing fluids stop spraying.

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