CN103658895B - A kind of device complex-shaped inner surface being carried out to electric discharge processing - Google Patents

Abstract

The invention discloses a kind of device of processing of carrying out discharging to complex-shaped inner surface, comprise processing power source, work piece holder for clamping workpiece, also comprise: column core electrode, be fixed in the endoporus of workpiece; Feed system, one end is provided with motor, sidewall to be provided with under the driving of motor can in predetermined stroke range linearly reciprocating magnetic pole fixture; Annular magnetic pole group, is fixedly installed on described magnetic pole fixture, and surrounds the outer wall of workpiece with being separated by certain interval; Control system, is connected with motor and processing power source by circuit; Two electrodes of described processing power source are connected with workpiece and core electrode respectively, are provided with conductive magnetic powder between described core electrode and the inner surface to be processed of workpiece.The art of this patent means are simple and easy to do, can be used for carrying out alligatoring, modification, strengthening etc. to complex-shaped inner surface, and also can be used for applying complex-shaped inner surface, its efficiency is high, and cost is low, has positive technique effect.

Description

A device for electrical discharge machining of complex-shaped inner surfaces

technical field

The invention belongs to the field of electrical machining, in particular to a device for electrical discharge machining of inner surfaces with complex shapes.

Background technique

With the development of economy and technology, various devices with complex-shaped inner surfaces have been widely used in production and life. Studies have shown that secondary processing of the inner surface of the device, such as manufacturing various Microstructure, strengthening the inner surface, or forming a coating on the complex inner surface, etc., can effectively improve the function of such devices, which has great practical significance. For example, if it can be used in heat pipes in various industrial fields It is expected to effectively improve the heat transfer efficiency of the heat pipe by manufacturing tiny structures on the surface. It is difficult to effectively perform secondary processing on such surfaces, so it is necessary to explore new technologies to meet the requirements of secondary processing of such inner surfaces.

The electric discharge machining method has been widely used in the industrial field, and can be used for the molding of parts, surface modification, strengthening, and the manufacture of functional coatings on the surface of parts.

However, if the traditional shaped electrode discharge machining method is used to process the complex shape of the inner surface, it is required to manufacture a rigid shaped electrode first, because the shaped electrode is quite difficult to manufacture and install, and there are still problems in the EDM process. Tool electrode wear, so EDM machining of complex-shaped inner surfaces is not only time-consuming but also costly.

If the method of WEDM is used to process the complex shape of the inner surface of the part, although it can avoid the problem of costing a lot of cost to manufacture the forming electrode, it can also ignore the impact of the loss of the tool electrode on the processing process. However, the processing speed of this method is Very low, it is difficult to meet the needs of actual production.

Contents of the invention

In view of the above technical problems, the present invention aims to solve the above technical problems at least to a certain extent.

The object of the present invention is to provide a device with simple structure, high efficiency and low cost for electric discharge machining of inner surfaces with complex shapes.

The present invention realizes through following technical scheme:

A device for performing electrical discharge machining on an inner surface with a complex shape, including a processing power supply, a workpiece fixture for clamping a workpiece, and also includes:

The core electrode is fixed in the inner hole of the workpiece through the electrode fixture, and is separated from the inner surface of the workpiece by a certain gap;

A feed system, one end of the feed system is provided with a motor, and the side wall is provided with a magnetic pole fixture that can reciprocate linearly within a predetermined stroke range under the drive of the motor;

The ring-shaped magnetic pole group is fixedly arranged on the magnetic pole fixture, surrounds the outer wall of the workpiece with a certain gap, and can perform linear reciprocating motion along the axis of the workpiece under the drive of the magnetic pole fixture;

The control system is connected with the motor and the processing power supply through the circuit;

The two electrodes of the processing power supply are respectively connected to the workpiece and the core electrode, and conductive electromagnetic powder made of iron powder or nickel powder is arranged between the core electrode and the inner surface of the workpiece to be processed.

Further, the bottom of the workpiece is also provided with an insulating baffle for isolating the workpiece and the core electrode.

Further, the contact surfaces between the workpiece holder and the workpiece, and the contact surfaces between the core electrode and the electrode holder are all insulated.

Further, it also includes a magnetic powder supply system for replenishing conductive magnetic powder between the core electrode and the inner surface of the workpiece, and the magnetic powder supply system is connected to the control system through a circuit.

Compared with prior art, the beneficial effect of the present invention is:

The conductive electromagnetic powder can automatically adapt and attach to the inner surface of the workpiece without special control. The conductive electromagnetic powder attached to the inner surface of the workpiece can move relative to the surface of the workpiece to be processed under the drive of the magnetic poles, and during the movement process EDM the inner surface of the workpiece.

Both the conductive magnetic powder and the magnetic pole are easy to obtain and the price is low.

The present invention does not need to make and install complex electrodes, the means are simple and easy to implement, and can have a large processing area, so it can obtain extremely fast processing speed, improve the processing efficiency of parts with complex inner surfaces, and promote this process. The industrial application of similar parts has positive significance.

The technical means of the patent is simple and easy to implement, and has positive technical effects.

Description of drawings

Fig. 1 is a schematic diagram of the mechanism of Embodiment 1 of the present invention.

Fig. 2 is a schematic cross-sectional view at A-A in Fig. 1 .

Fig. 3 is a partially enlarged schematic diagram of I in Fig. 2 .

In the figure: 1-workpiece; 2-core electrode; 3-conductive magnetic powder; 4-processing power supply; 5-insulation baffle; 6-magnetic pole group; 7-magnetic pole fixture; 8-magnetic powder supply system; 9-workpiece fixture; 10 -electrode fixture; 11-control system; 12-feed system; 13-motor; 14-worktable.

detailed description

The purpose of the invention of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, and the embodiments cannot be repeated here one by one, but the implementation of the present invention is not therefore limited to the following embodiments.

Example:

As shown in Figures 1 to 3, a device for performing electrical discharge machining on an inner surface with a complex shape includes a processing power source 4, a workpiece fixture 9 for clamping a workpiece 1, and also includes:

The columnar core electrode 2 is fixed in the inner hole of the workpiece 1 through the electrode fixture 10, and is separated from the inner surface of the workpiece 1 by a certain gap;

Feed system 12, one end of the feed system 12 is provided with a motor 13, and the side wall is provided with a magnetic pole clamp 7 that can reciprocate linearly within a predetermined stroke range under the drive of the motor 13;

The annular magnetic pole group 6 is fixedly arranged on the magnetic pole fixture 7, and surrounds the outer wall of the workpiece 1 with a certain gap, and can perform linear reciprocating motion along the axis of the workpiece 1 under the drive of the magnetic pole fixture 7;

The control system 11 is connected with the motor 13 and the processing power supply 4 through a circuit;

The positive pole of the processing power supply 4 is connected to the workpiece 1, and the negative pole is connected to the core electrode 2. Conductive magnetic powder 3 made of iron powder or nickel powder is arranged between the core electrode 2 and the inner surface of the workpiece 1.

Further, the bottom of the workpiece 1 is also provided with an insulating baffle 5 for isolating the workpiece 1 from the core electrode 2 , and the insulating baffle 5 can prevent the core electrode 2 from contacting the workpiece 1 .

Further, the contact surfaces between the workpiece holder 9 and the workpiece 1 , and the contact surfaces between the core electrode 2 and the electrode holder 10 are all insulated.

Further, it also includes a magnetic powder supply system 8 for replenishing conductive magnetic powder 3 between the core electrode 2 and the inner surface of the workpiece 1 to be processed, and the magnetic powder supply system 8 is connected with the control system 11 through a circuit.

The operation process and working principle of the complex inner surface electric discharge machining device provided in this embodiment are as follows:

(1) Fix the workpiece 1 on the workbench 14 through the workpiece fixture 9, fix the core electrode 2 in the inner hole of the workpiece 1 through the electrode fixture 10, and make a certain gap between it and the inner surface of the workpiece 1;

(2) Supply an appropriate amount of conductive magnetic powder 3 between the core electrode 2 and the inner surface of the workpiece 1 to be processed through the magnetic powder supply system 8, so that the conductive magnetic powder 3 and the inner surface of the workpiece 1 to be processed are effectively bonded.

(3) During processing, the workpiece 1 is connected to the positive pole of the processing power supply 4, and the core electrode 2 is connected to the negative pole of the processing power supply 4 (or according to actual processing needs, the workpiece 1 can also be connected to the negative pole of the processing power supply 4, while the core electrode 2 is connected to the processing Positive pole of power supply 4);

(4) During the processing, the magnetic pole set 6 is fixed on the magnetic pole fixture 7, the feed system 12 drives the magnetic pole fixture 7 to drive the magnetic pole set 6 to perform linear motion, and the conductive magnetic powder 3 is driven by the magnetic pole set 6 on the inner surface of the workpiece 1 to be processed Sliding upward, and forming a spark discharge effect on the inner surface that fits with it, so as to realize the purpose of EDM on the inner surface of the workpiece 1. During processing, the discharge parameters can be controlled, such as EDM voltage, EDM current, pulse width , pulse interval, etc. to control the processing degree.

During the EDM process of conductive electromagnetic powder 3, the discharge loss of conductive electromagnetic powder 3 can be supplemented by magnetic powder supply system 8, and the amount of conductive electromagnetic powder 3 supplemented by magnetic powder supply system 8 can be carried out by control system 11 according to actual processing conditions. control.

During the machining process, the conductive magnetic powder 3 can automatically adapt to the inner surface of workpieces with various complex shapes. During the relative movement between the conductive magnetic powder 3 and the surface of the workpiece 1, the inner surface of the workpiece 1 is subjected to electric discharge machining.

Conductive electromagnetic powder can be discharged in air, argon and other gases, and can also be discharged in liquids such as deionized water and emulsion. It can be used to coat various inner surfaces with complex shapes.

During the processing, although the magnetic powder between the core electrode 2 and the workpiece 1 will be continuously removed by the discharge effect, the conductive magnetic powder can be continuously replenished through the magnetic powder supply system 8, so that the conductive magnetic powder can effectively maintain the bonding state with the surface of the workpiece , so as to ensure that the processing can continue.

In order to meet different processing requirements during processing, the movement speed of the magnetic pole group 6 can be adjusted through the action of the control system 11 on the motor 13 . In addition, the processing electric signal can be monitored through the data acquisition card to realize the control of the processing process.

Just can realize this patent preferably as mentioned above.

The above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (4)

1. carry out discharging to complex-shaped inner surface the device of processing, comprises processing power source (4), work piece holder (9) for clamping workpiece (1), it is characterized in that, also comprise:

Core electrode (2), is fixed in the endoporus of workpiece (1) by electrode holder (10), and to be separated by certain gap with the inner surface of workpiece (1);

Feed system (12), one end of described feed system (12) is provided with motor (13), sidewall to be provided with under the driving of motor (13) can in predetermined stroke range linearly reciprocating magnetic pole fixture (7);

Annular magnetic pole group (6), be fixedly installed on described magnetic pole fixture (7), and surround the outer wall of workpiece (1) with being separated by certain interval, and under the drive of magnetic pole fixture (7), straight reciprocating motion can be done along the axis of workpiece (1);

Control system (11), is connected with motor (13) and processing power source (4) by circuit;

Two electrodes of described processing power source (4) are connected with workpiece (1) and core electrode (2) respectively, and being provided with between the inner surface to be processed of described core electrode (2) and workpiece (1) by iron powder or nickel powder is the conductive magnetic powder (3) of material.

2. the device complex-shaped inner surface being carried out to electric discharge processing according to claim 1, is characterized in that: the bottom of described workpiece (1) is also provided with the insulation barrier (5) for isolating workpiece (1) and core electrode (2).

3. the device of processing of carrying out discharging to complex-shaped inner surface according to claim 1, is characterized in that: to be insulation between the contact surface of described work piece holder (9) and workpiece (1), between core electrode (2) and the contact surface of electrode holder (10).

4. the device complex-shaped inner surface being carried out to electric discharge processing according to claim 1, it is characterized in that: also comprise the magnetic supply system (8) to supplementing conductive magnetic powder (3) between core electrode (2) and the inner surface of workpiece (1), described magnetic supply system (8) is connected by circuit with control system (11).