A kind of ultra-thin superhard grinding wheel conductive grinding cutting processing method based on conductive material

Abstract

The application discloses a kind of based on the electrically conductive material's ultra-thin superhard grinding wheel electrically conductive grinding cutting processing method, when using ultra-thin superhard grinding wheel cutting electrically conductive material, pulse current is passed to electrically conductive workpiece, current will be generated in cutting processing area and flow around aggregation, a large amount of heat is generated, that is, electromagnetic heat effect is generated, the temperature of material around cutting processing area is rapidly increased, the material of cutting processing area is softened, hardness is decreased, so that electrically conductive material is easily cut, realizes the composite processing method of electrically conductive and grinding cutting processing;Specific steps are to install the anode and cathode special machine head of pulse power processing on grinding machine, connect the two ends of electrically conductive workpiece with wire, form processing current loop;Then select appropriate pulse power parameters, and grind and cut electrically conductive workpiece.This application has the characteristics of easy cutting material, high processing efficiency, and is an effective processing method for precision grinding slotting and cutting of difficult-to-machine electrically conductive materials.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of ultra-thin superhard grinding wheel based on conductive material's ultra-thin superhard grinding wheel conductive grinding cutting processing method. BACKGROUND

[0002] Ultra-thin superhard grinding wheel has the main characteristics of high precision, narrow kerf, cutting sharp, high rigidity, high strength, etc.;Ultra-thin superhard material grinding wheel cutting processing is mainly used for cutting and grooving of various electronic components in electronic information field and precision difficult-to-machine materials of aerospace, national defense and military industry, with a series of advantages such as large grinding depth, small feed speed, large contact area of grinding wheel and workpiece, narrow kerf, high grinding precision, good machining surface quality, high material utilization rate and long service life of grinding wheel.

[0003] For example, cubic boron nitride cutting wheel is mainly used for precision grooving and cutting of various difficult-to-machine conductive materials, such as die steel, bearing steel, stainless steel and other difficult-to-machine black conductive materials. The thickness of the whole cutting wheel is less than 0.5mm, with the characteristics of small outer diameter, fine granularity, high size and shape accuracy, and light weight. The processing adopts deep cutting and slow feed grinding method and high speed grinding process, and the depth is cut once.

[0004] However, when grinding and cutting these difficult-to-machine conductive materials, the cutting processing efficiency is low, the cost is high, and the grinding force is large during processing, which is easy to cause deformation of the workpiece and reduce the processing surface quality. SUMMARY

[0005] The present application aims to overcome the shortcomings of the existing ultra-thin superhard grinding wheel grinding and cutting processing method for conductive materials, and provides a new type of processing method based on conductive grinding and cutting processing method for conductive materials, that is, high-voltage pulse discharge is carried out on the conductive workpiece during grinding and cutting processing, electromagnetic heat effect is generated in the grinding and cutting area, a large amount of heat is generated, the conductive material in the cutting area is softened, the grinding and cutting processing efficiency is improved, the processing cost is reduced, the processing precision is guaranteed, and a new type of processing method is formed.

[0006] Electromagnetic heat effect: when pulse current is passed through the conductor, joule heat and stress will be generated in the conductor. Due to the existence of cracks (such as narrow slots) in the conductor, the current will flow around and concentrate. Due to the concentration of current at the tip of the crack (such as narrow slot), the electric energy is converted into heat energy, so that the temperature of the material at this position is raised to a degree sufficient to melt the material.

[0007] To achieve the above-mentioned purpose, the following technical scheme is adopted: an ultra-thin superhard grinding wheel conductive grinding cutting processing method based on conductive material, comprising the following steps:

[0008] (1) install pulse power device:

[0009] The processing method uses pulse electricity, and the power supply device is installed in a suitable position in advance;

[0010] (2) Install the conductive workpiece:

[0011] Use the clamp to install the conductive material workpiece on the grinding machine workbench;

[0012] (3) Install the pulse power source processing anode special connector:

[0013] Connect the anode special connector with the power supply anode cable, then install the anode special connector on the grinding machine, and finally contact the anode connector with one end of the workpiece;

[0014] (4) Install the pulse power source cathode special connector:

[0015] Connect the cathode special connector with the power supply cathode cable, then install the cathode special connector on the grinding machine, and finally contact the cathode connector with the other end of the workpiece;

[0016] (5) Start the grinding machine:

[0017] Start the grinding machine, and make the ultra-thin super-hard grinding wheel (such as a cubic boron nitride cutting grinding wheel) rotate at high speed, and grind and cut the conductive workpiece;

[0018] (6) Pulse power source processing:

[0019] Set the processing parameters of the pulse power source, turn on the power supply, and pulse discharge the workpiece. The output voltage of the pulse power source is 0-30KV, and the output current floats between 0-500A according to the processing condition; because a certain length of narrow slit (the width of the narrow slit is generally less than 0.5mm) has been cut on the material in stage (5), then under the continuous discharge of the high-voltage pulse power source, the current generates a large amount of Joule heat in the narrow slit tip grinding area, that is, the pulse current concentrates around the flow in the narrow slit tip grinding area, generates electromagnetic heat effect, and thus softens or melts the conductive material in the narrow slit tip grinding area, so that the grinding and cutting speed is greatly improved.

[0020] Further, when the clamp is positioned and clamped with the two ends of the conductive workpiece in step (2), the clamp and the workpiece are insulated.

[0021] Further, the pulse power source processing anode and the anode special connector connected with the grinding machine in steps (3) and (4) are insulated, and are connected with the pulse power source anode and cathode cables through quick connectors.

[0022] Further, the grinding wheel used in step (5) is an ultra-thin super-hard material grinding wheel, which is suitable for precise slot cutting; and an insulating grinding fluid is used for cooling and lubrication during processing.

[0023] Compared with the prior art, the present application has the advantages that:

[0024] The present application combines the pulse conduction of the conductive workpiece with the grinding and cutting processing of the ultra-thin and super-hard material, and adopts the high-voltage pulse current to discharge the conductive workpiece, so that the electromagnetic heat effect is generated in the grinding and cutting area, a large amount of heat is generated, the conductive material in the cutting area is softened, and the grinding force is reduced when the ultra-thin and super-hard grinding wheel is used for grinding and cutting processing, and the grinding amount is greatly increased. Compared with the single ultra-thin and super-hard grinding wheel grinding and cutting processing, the present application has the advantages of shortening the processing time, improving the grinding processing efficiency, ensuring the processing precision and quality, realizing the cutting and grooving processing requirements of the precision and difficult-to-process materials of the aerospace, national defense and military industry, and is a new type of efficient grinding and cutting processing technology. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings are part of the specification and are used to further understand the present application, and together with the embodiments of the present application, are used to explain the present application, but do not constitute a limitation on the present application.

[0026] Fig. 1 The present application is an ultra-thin and super-hard grinding wheel conductive grinding and cutting processing state diagram for conductive materials.

[0027] Fig. 2 The present application is an ultra-thin and super-hard grinding wheel conductive grinding and cutting processing principle state diagram for conductive materials.

[0028] The accompanying drawings are part of the specification and are used to further understand the present application, and together with the embodiments of the present application, are used to explain the present application, but do not constitute a limitation on the present application. DETAILED DESCRIPTION

[0029] As shown in Figs. 1-2

[0030] (1) Install the pulse power supply device:

[0031] The present application is an ultra-thin and super-hard grinding wheel conductive grinding and cutting processing principle state diagram for conductive materials.

[0032] (2) Install the conductive workpiece:

[0033] The present application is an ultra-thin and super-hard grinding wheel conductive grinding and cutting processing principle state diagram for conductive materials.

[0034] (3) Install the pulse power supply processing anode special joint:

[0035] ​Connect the anode cable 4 to the anode connector 5, then install the anode connector 5 on the grinding machine 3, and finally bring the anode connector 5 into contact with one end of the workpiece 2.

[0036] (4) Install the dedicated cathode connector for the pulse power supply:

[0037] Connect the cathode cable 6 to the cathode connector 7, then install the cathode connector 7 on the grinding machine 3, and finally bring the cathode connector 7 into contact with the other end of the workpiece 2.

[0038] (5) Start the grinding machine:

[0039] Adjust the ultra-thin and ultra-hard grinding wheel 8 (such as a cubic boron nitride cutting grinding wheel), start the grinding wheel spindle box 9 to make the grinding wheel 8 rotate at high speed, and turn on the grinding fluid 10 to start grinding and cutting the conductive workpiece 2.

[0040] (6) Pulse power supply processing:

[0041] Set the processing parameters of the pulse power supply, turn on the power supply device 1 to pulse discharge the workpiece 2. The output voltage of the pulse power supply can be 0~30KV, and the output current fluctuates between 0~500A depending on the processing conditions; since a certain length of narrow slit (the width of the narrow slit is generally less than 0.5mm) has been cut on the workpiece 2 in stage (5), and then under the continuous discharge of the high voltage pulse power supply, the current generates a large amount of Joule heat in the grinding area of ​​the narrow slit tip, that is, the pulse current concentrates and flows around in the grinding area of ​​the narrow slit tip, generating an electromagnetic heating effect, thereby softening or melting the conductive material in the grinding area of ​​the narrow slit tip ( Fig. 2 This greatly improves the grinding and cutting speed, enabling rapid cutting or processing of narrow slits.

[0042] When using the three-jaw chuck 13 to position and clamp one end of the workpiece 2 in step (2), insulation treatment must be performed; when the center point 12 on the tailstock 11 positions the other end of the workpiece 2, insulation treatment must also be performed.

[0043] In steps (3) and (4), the connection points between the pulse power processing anode head 5 and anode head 7 and the grinding machine 3 must be insulated and connected to the pulse power anode cable 4 and cathode cable 6 via quick-connect plugs.

[0044] The grinding wheel 8 used in step (5) is an ultra-thin and ultra-hard material grinding wheel, which is suitable for precision grooving cutting; the grinding fluid 10 used in the processing is insulating.

[0045] The above described embodiments are only to illustrate the preferred modes of the present application, and are not intended to limit the scope of the present application. Any modification and improvement made by those skilled in the art to the technical solutions of the present application without departing from the design spirit of the present application shall fall within the protection scope of the present application.

Claims

1. A method of electroconductive grinding cutting processing based on an ultra-thin superhard grinding wheel of electroconductive material, characterized in that, The method comprises the following steps: (1) installing a pulse power device: The pulse power is used in the processing method, and the power device is installed in a suitable position in advance; (2) installing a conductive workpiece: The conductive material workpiece is installed on the grinding machine workbench by using a tool; (3) installing a pulse power anode special connector: The anode special connector is connected with the anode cable of the power supply, and then is installed on the grinding machine, and finally the anode connector is in contact with one end of the workpiece; (4) installing a pulse power cathode special connector: The cathode special connector is connected with the cathode cable of the power supply, and then is installed on the grinding machine, and finally the cathode connector is in contact with the other end of the workpiece; (5) starting the grinding machine: The grinding machine is started, and the ultra-thin super-hard grinding wheel is rotated at high speed to grind and cut the conductive workpiece; (6) pulse power processing: The processing parameters of the pulse power are set, the power is turned on to discharge pulse to the workpiece, the output voltage of the pulse power can be set to 0-30KV, and the output current is floating between 0-500A according to the processing condition; Because a certain length of narrow slot is cut in the material in step (5), the width of the narrow slot is generally less than 0.5mm, then under the continuous discharge of the pulse power, a large amount of joule heat is generated at the tip of the narrow slot, that is, the pulse current gathers and flows around the tip of the narrow slot, generates electromagnetic heat effect, so that the conductive material in the cutting area of the tip of the narrow slot is softened or melted, so that the grinding is easy, and the cutting speed is greatly improved.

2. The method according to claim 1, wherein the conductive material-based ultra-thin superhard grinding wheel conductive grinding cutting processing method is characterized in that, In step (2), the clamp is insulated when the clamp and the workpiece are positioned and clamped at both ends of the conductive workpiece.

3. The method according to claim 1, wherein the conductive material-based ultra-thin superhard grinding wheel conductive grinding cutting processing method is characterized in that, In steps (3) and (4), the connection position between the pulse power processing anode, the anode special connector and the grinding machine is insulated, and is connected with the pulse power anode and cathode cable through the quick connector.

4. The method according to claim 1, wherein the conductive material-based ultra-thin superhard grinding wheel conductive grinding cutting processing method is characterized in that, In step (5), the grinding wheel used is an ultra-thin super-hard material grinding wheel suitable for precise slotting and cutting; and an insulating grinding fluid is used for cooling and lubrication during processing.

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