KR102390213B1 - Discharge mold machine - Google Patents

Abstract

The present invention is an electric discharge machining mold device. When wires of different materials and sizes are used for electric discharge machining, the electric discharge machining mold device can perform machining in a batch with different wires fastened without needing to replace a device in accordance with the size and material of the wire. Accordingly, the efficiency is increased even in small quantity production of various kinds. The electric discharge machining mold device includes a winding part, a guide part, a head part, and a body part.

Description

Electric discharge machining mold equipment {DISCHARGE MOLD MACHINE}

The present invention is an electric discharge machining mold apparatus, and when wires of different materials and sizes are used for electric discharge machining, processing can be carried out in batches with different wires connected without needing to replace the apparatus according to the size and material of the wire. there is an invention

In general, a wire-cutting electric discharge mold device is a component of a mold device that uses a wire of about 0.05 mm to about 0.3 mm to generate electric discharge between a wire electrode and a workpiece to process it into a desired shape.

When the wire is used once and removed from the device, there is a risk of tension and strength.

The thickness of the wire is set differently depending on the processing conditions, and in general, 0.05mm to 0.15mm is used as an ultra-precision wire, 0.15mm to 0.25mm is a precision wire, and up to 0.3mm is used as a large processing wire.

The wire is made of various materials such as brass, copper and tungsten as well as thickness, and a wire of a suitable material is applied and used according to the object to be processed and the processing method.

Since the wire processing is used once and discarded, economical efficiency is important, and it is very important to select a suitable wire according to the object to be processed. If the proper wire is not used, defects occur and there is a risk of fire due to sparks because different voltages are applied to each material.

A general wire electric discharge machining apparatus has a disadvantage of removing and mounting parts by fastening a wire suitable for processing different objects.

These disadvantages cause injury time of the process and increase manpower and cost.

Therefore, even when a plurality of wires with different thicknesses and materials are bundled together to produce a variety of small-volume products, electric discharge machining is performed without replacing parts to simplify the process and reduce manpower and cost. There is a need for a mold device.

Republic of Korea Registered Utility Model Publication No. 20-0149475

The present invention is an invention in which the electric discharge machining mold apparatus can be used collectively without replacing the apparatus to process different workpieces by fastening different wires to one apparatus, thereby simplifying the process, reducing manpower and cost. There is a purpose.

The electrical discharge machining mold apparatus according to the present invention includes a winding unit on which a plurality of wires are wound; a guide part coupled to the winding part and having a hole through which a plurality of wires pass; a head part including a first head part to which the first wire is coupled, a second head part to which the second wire is coupled, a third head part to which the third wire is coupled, and a fourth head part to which the fourth wire is coupled; and a body part coupled to the lower end of the guide part, to which the head part is coupled, wherein one of the head parts is selected from among the head parts to perform electric discharge machining of the workpiece.

The winding part according to the present invention is installed on the upper part of the workpiece, and the main body guides the head part to be perpendicular to the upper part of the workpiece.

According to the present invention, the first head portion, a first needle portion to which the wire is sent; and a first adjustment head unit to which the first needle unit is coupled.

The first adjusting head part according to the present invention is coupled to the body part, and ascends and descends toward the body part.

a rolling part coupled to the inside of the guide part according to the present invention; and a sending unit coupled to the inside of the head unit, wherein the rolling unit transports and supplies the wire supplied from the winding unit to the sending unit.

According to the present invention, the sending unit transfers the wire to the first needle part, and forms a tension in the wire.

According to the present invention, the guide unit includes an adjusting unit for adjusting the torque value according to the type of the wire, and the adjusting unit includes: an adjustment push unit for pressing the rolling unit; and a display unit displaying the torque value.

According to the present invention, the rolling part and the sending part are in the form of a pair of rollers.

The present invention is an invention in which various kinds of small quantity production is possible and efficiency is increased by using a discharge device in which various kinds of wires are installed without needing to replace the wires even when various kinds of workpieces are processed.

In addition, by shortening the time for replacing the wire, there is an effect of preventing the increase in waste of manpower and production time.

1 is a view for explaining an example of use of the electric discharge machining mold apparatus of the present invention.
2 is a view for explaining the discharge device of the present invention.
3 is a view to explain a plurality of wires and structures coupled to the discharge device of the present invention.
Figure 4 is a view for explaining the head portion and the torque portion of the present invention.
5 is a diagram for explaining the configuration for maintaining the tension of the wire of the present invention.

Hereinafter, embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily carry out the present invention. However, the present invention may be embodied in several different forms and is not limited to the embodiments described herein.

The terminology used herein is for the purpose of describing the embodiments, and thus is not intended to limit the present invention. In this specification, the singular form also includes the plural form unless otherwise specified in the phrase. As used herein, “comprise” and/or “comprising” refers to the presence of one or more other components, steps, operations and/or elements mentioned. or addition is not excluded.

In the present invention, the longitudinal direction refers to the X-axis direction with reference to FIG. 3 , the width direction refers to the Y-axis direction, and the vertical direction refers to the X-axis direction.

The electric discharge machining mold apparatus 100 according to the present invention automatically performs complex machining (cutting, hole, etc.) through computer control programming such as NC control on an XY plotter type table for wire electric discharge machining of the workpiece (P). It is an invention in which various types of small quantity production is possible and efficiency is increased by using the discharge device 200 in which various types of wires are installed without needing to replace the wires even when various types of workpieces (P) are processed.

Referring to FIG. 1 , the present invention includes a mold device 100 , a discharge device 200 , a discharge oil supply unit 300 , and a winding unit 400 .

The mold apparatus 100 is a device that performs processing by connecting a die (table) of the XY plotter type for wire electric discharge machining and the devices of the present invention, and a power supply for generating electric discharge between the fixed workpieces (P) It is preferable that a driving unit for driving the supply device, computer, and control programming is installed, and although not shown, it is preferable that a conductor for generating a discharge is connected and a device for applying current and voltage is built-in.

According to the present invention, high-precision processing can be carried out regardless of material hardness or brittleness as long as it has conductivity (property to conduct electricity). It has a wide range of features.

In addition, the present invention is a thin wire (wire) electrode made of various materials such as copper, brass, tungsten, etc., while giving a constant tension and feed rate, a voltage is applied between the wire and the workpiece (P) to generate between the workpiece (P) and the wire The workpiece (P) is processed using the electric discharge phenomenon.

When the winding unit 400 is described with reference to FIG. 1 , the winding unit 400 includes a winding device, and the winding device may be configured in plurality to divide and wind a plurality of wires.

The winding device winds the wire (W) so that a certain tension is maintained to guide the wire (W) to the discharge device 200 to be described later so that it can be moved and sent.

The winding unit 400 is coupled to the mold apparatus 100 at the upper end of the workpiece P, and supplies the wire to the rolling part 214 and the sending part 240 to be described later, and means for maintaining the tension so as not to stretch the wire. is used as

2 and 3 , the discharge device 200 of the present invention includes a guide part 210 , a body part 220 , and a plurality of head parts 230 .

The guide part 210 of the present invention is coupled to the winding part 400 and it is preferable that a plurality of holes (H) for receiving the wire from the winding part 400 are formed.

It is preferable that the plurality of holes (H) communicate with the winding unit 400 in the form in which wires (W) made of different thicknesses and materials are inserted, respectively.

The wire W may be supplied through the hole H, and the wire W may be guided and supplied to the head 230 through the main body 220 to be described later.

The body part 220 is coupled to the lower end of the guide part 210 and the head part 230 is perpendicular to the workpiece (P) to perform processing, and a plurality of head parts 230 are mounted to the workpiece (P). Regardless of the type, it is possible to perform general-purpose processing.

In addition, it is preferable that the inside of the main body 220 communicates with the aforementioned hole, through which the wire W can be supplied and passed.

The head unit 230 is configured in plurality, and for convenience of description, the first head unit 231 , the second head unit 232 , the third head unit 233 , and the fourth head unit 234 will be described.

Since the first head part 231 to the fourth head part 234 have the same configuration and shape, it is preferable to understand that the entire head part 230 is described even if any one head part 230 is described.

The first head part 231 to the fourth head part 234 may be coupled to wires W having different thicknesses and materials, respectively, which is a first wire W1 and a second wire W2 for convenience of description. ), a third wire (W3), and a fourth wire (W4), respectively, a first head part 231 , a second head part 232 , a third head part 233 , and a fourth head part 234 , respectively. ) is preferably understood to be coupled to, and for convenience of description, the first head portion 231 and the second head portion 232 will be mainly described.

The head unit 230 is configured in plurality, and one of the first head units 231 to the fourth head unit 234 is positioned on the table on which the work is performed, and processing is performed.

To this end, referring to FIG. 3 , the wire W supplied through the hole H of the guide unit 210 is supplied to the head unit 230 through the body unit 220 .

The supplied wire (W) is positioned on the upper part of the workpiece (P) to perform electric discharge machining on the workpiece (P).

The user can process the workpiece (P) by selecting a wire suitable for the workpiece (P), and referring to FIG. 4 , the first head part 231 includes a first needle part 2312 and a first adjustment head part ( 2311).

The first adjustment head unit 2311 is preferably coupled to the body unit 220 so as to be able to ascend and descend toward the inside of the body unit 220 in the vertical direction, and the head unit 230 that is not used for processing through this is the body unit. (220) When processing by ascending and descending inside, it is not involved in processing.

This has the advantage of preventing damage due to the jamming of the head part 230 that is not used for processing on the workpiece P during processing.

In addition, the spark (S) generated during electric discharge machining is effective in preventing the damage of the wire and the head part 230 due to the heat of the spark (S) as well as preventing the discharge phenomenon from being splashed on other wires.

The first needle part 2312 is preferably communicated in a conical shape to receive the wire inside, and adopts a cone shape that becomes sharper toward the end to receive the wire and perform electric discharge machining to prevent the shaking of the wire. do.

This has the effect of improving the processing accuracy of the workpiece (P) by preventing the wobbling of the wire.

The configuration of the first head portion 231 described above is preferably applied to the first head portion 231 to the fourth head portion 234 .

Due to the characteristics of the above-described mold apparatus 100, the user does not use a replacement tool (TOOL) to process wires having different thicknesses and materials to the workpiece (P), but batch processing with one device. It has the effect of increasing workability by being able to perform the work.

In addition, there is no injury (loss) time that occurs when the tool is replaced and used, thereby increasing productivity and reducing manpower and production costs.

In addition, the guide unit 210 of the present invention includes an adjustment unit 211 , an adjustment push unit 212 , and a display unit 213 capable of adjusting a torque value in order to maintain the tension of wires having different thicknesses.

Referring to FIG. 4 , the adjusting unit 211 allows the user to control the first wire W1 and the second wire W2 on the same line in the vertical direction as the first head portion 231 and the second head portion 232 . Preferably, it is positioned so that the torque value can be adjusted.

The adjusting unit 211 is a pusher, wire, screw fastening, torque wrench, etc. various torque values through a pair of adjusting push units 212 capable of adjusting the torque values of the first wire W1 and the second wire W2. The torque value can be set via the adjuster.

By setting the torque value according to the thickness and material of the wire, the proper tension of the wire is maintained, and the processing can be performed without sagging of the wire by applying the appropriate wire pressure according to the thickness.

This can improve the quality of the product of the workpiece (P) by maintaining appropriate tension in correspondence with wires having different thicknesses and materials, and can be used immediately even if different wires are replaced, thereby improving versatility.

The display unit 213 may display a torque value to a user, and various display methods such as an analog method and an electronic method may be used.

Through this, the user can visually know the torque value, thereby improving machining accuracy, and immediately knowing the torque value, thereby improving convenience.

In electric discharge machining, as the tension of the wire is strong, it contributes to the improvement of the machining speed. If the tension is strong, the vibration amplitude of the wire generated from the repulsive force caused by the electric discharge is small, and thus the electric discharge efficiency of the machining is increased, which has an advantage in improving the machining speed.

Since the wire's machining force and short circuit are reduced when the wire's feed speed is increased, it is important to prevent quality problems from occurring even if the machining speed is increased by maintaining the strong tension of the wire.

To this end, the rolling unit 214 and the sending unit 240 will be described with reference to FIG. 5 in the present invention.

The rolling part 214 is formed in a pair in the form of a roller, and it is preferable that a wire pass between the pair of rolling parts 214 facing each other.

It is preferable that the rolling part 214 be able to rotate in the opposite direction in the form of a roller, and through this, a wire may be transferred to move to the sending part 240 .

Here, the rolling part 214 can move in the longitudinal direction through the aforementioned low-cutting push part to maintain the tension by adjusting the torque value, and the above-described winding part 400-rolling part 214-dispensing part 240 in the order The wire is delivered and the wire is delivered to the head part 230 so that the wire protrudes out of the head part 230 so that electric discharge machining can be performed.

The sending unit 240 is also formed in a pair in the form of a roller, and it is preferable that the wire pass between the sending units 240 . Through this, the wire is transferred to the first needle part 2312 and is preferably sent out so that the wire can be electric discharge machining toward the workpiece (P).

The present invention is characterized in that the wire is transferred and sent through the winding unit 400 - the rolling unit 214 - the sending unit 240, and the rolling unit 214 and the sending unit 240 strongly fix the wire to increase the tension. There is this. That is, the wire can be transferred and sent without sagging, and through this, the amplitude according to the vibration of the wire is reduced, thereby increasing the discharge efficiency.

In addition, as the strong tension is maintained, there is an effect of maintaining the processing quality even if the processing speed is increased.

In addition, due to the double fixing form through the rolling part 214 and the sending part 240, there is an effect of preventing the bending of the wire.

Referring to Figure 1, the discharge oil supply unit 300, which sprays the discharge oil on the workpiece (P) to proceed with the discharge, supplies the discharge oil between the wire and the workpiece (P), and the electric discharge machining takes place to form a fine arc column. When electricity with high current density flows and discharge machining is performed at a point on the workpiece (P), the discharge oil is sprayed on the workpiece (P) and the discharge oil is partially converted to a vaporized state by heat.

Here, the surrounding processing oil receives pressure from both the melted workpiece and the electrode due to rapid vaporization and expansion due to heat, and the molten part of the workpiece scatters in a small spherical shape and diffuses into the discharge oil, leaving the electrode on the workpiece (P).

After that, after the molten metal is scattered, the discharge oil is continuously supplied to the vicinity of the machined area to cool the remaining heat to proceed with the machining.

In the present invention, as the discharge oil, deionized water or oil for discharge may be used, and electricity flows through the electrode with the workpiece (P) as an anode to cause a discharge phenomenon using thermal energy and a spark (S) to create a workpiece (P) It is used to process the workpiece (P) through electrode consumption in a non-contact manner by melting and evaporating.

The discharge oil supply unit 300 has the effect of preventing fire in advance by preventing overheating during discharge machining, and has the effect of increasing discharge efficiency and improving product quality during discharge machining.

Although the present invention describes four head parts 230, two, three, four or more head parts 230 may be used as needed, and the first head part 231 to the fourth head part ( 234) is not included in the technical scope of the present invention only by processing the offering.

The head part 230 of the present invention may be corroded due to frequent exposure to discharge oil, heat, and sparks (S).

When the electric discharge machining is performed due to corrosion, there is a problem that the quality of the product is deteriorated due to the risk of damage by heat and sparks (S), and there is a problem in that the efficiency of the operation is lowered due to the damage of the head part 230 .

Accordingly, a coating layer is formed on the surface of the head portion 230 of the present invention through an anti-corrosion coating to prevent corrosion.

The coating layer (not shown) is to be coated using a coating composition, and the coating layer using the coating composition may exhibit an anti-corrosion effect. Specifically, the coating layer is formed on the surface of the head part 230 by the coating layer to prevent external exposure of the head part 230 , and contains a metal having a higher ionization tendency than the head part 230 , so the head part It is possible to prevent corrosion of (230).

More specifically, the coating composition of the present invention may include a siloxane-based compound represented by the following Chemical Formula 1; organic solvents, metal compounds and amine compounds:

[Formula 1]

Here, n is an integer from 1 to 100.

When the coating layer is formed on the surface of the head part 230 by using the coating composition of the present invention, the adhesive force with the head part 230 is excellent, so that the coating layer is not easily peeled off by an external force, and is ionized than the head part 230 . By including a metal compound having a high tendency, an excellent anti-corrosion effect may be exhibited.

Specifically, the siloxane-based compound not only exhibits excellent adhesion to the head unit 230, but also maintains the viscosity of the coating composition at a certain level to increase moldability and enhance stability.

The metal compound serves as an erosion and corrosion inhibitor that blocks contact with moisture, salt or oxygen. Here, the metal compound may use a metal having a higher ionization tendency than iron in order to act as an erosion and corrosion inhibitor. That is, a metal or alloy such as aluminum (Al), magnesium (Mg), or zinc (Zn) may be used, and zinc (Zn) is mainly used.

The particle size of the metal compound may be 0.1 to 10㎛. When the particles of the metal compound are 0.1 μm or more, the manufacturing cost of the metal compound can be reduced, and when the particles of the metal compound are 10 μm or less, the metal particles can be uniformly dispersed.

The organic solvent is selected from the group consisting of methyl ethyl ketone (MEK), toluene, and mixtures thereof, and preferably methyl ethyl ketone may be used, but is not limited thereto.

The amine compound may include modified aliphatic amines or tertiary amines, and specifically, trimethylamine or aniline may be used. The amine compound may be included in the coating composition to prevent cracking or peeling of the coating film. That is, by increasing the adhesion of the coating layer, the effect of preventing cracking or peeling of the coating film according to use is excellent.

The coating composition may further include a stabilizer as other additives, and the stabilizer may include a UV absorber, an antioxidant, and the like, but is not limited to the above examples and may be used without limitation.

For forming the coating layer, the coating composition may include a siloxane-based compound represented by Formula 1 below; organic solvents, metal compounds and amine compounds.

The coating composition may include 40 to 60 parts by weight of the siloxane-based compound represented by Formula 1, 20 to 40 parts by weight of the metal compound, and 5 to 15 parts by weight of the amine compound, based on 100 parts by weight of the organic solvent. In the case of the above range, a synergistic effect of a degree in which the water repellency effect by the interaction of each component has a critical significance is expressed, and when it is out of the above range, the synergistic effect is rapidly reduced or almost absent.

More preferably, the viscosity of the coating composition is 1500 to 1800 cP, and if the viscosity is less than 1500 cP, when applied to the surface of the head part 230, there is a problem that it is not easy to form a coating layer by flowing down, and exceeding 1800 cP In this case, there is a problem in that the formation of a uniform coating layer is not easy.

[Preparation Example 1: Preparation of coating layer]

1. Preparation of coating composition

A coating composition was prepared by mixing methyl ethyl ketone with a siloxane-based compound represented by the following Chemical Formula 1, zinc and trimethylamine:

[Formula 1]

Here, n is an integer from 1 to 100.

A more specific composition of the coating composition is shown in Table 1 below.

TX1 TX2 TX3 TX4 TX5 organic solvent 100 100 100 100 100 polysiloxane 30 40 50 60 70 metal compound 10 20 30 40 50 amine compounds One 5 10 15 20

(unit weight parts)2. Preparation of coating layer

Typically, an experiment was conducted using aluminum, which is a metal material that easily corrodes, instead of the head part 230 .

After coating the coating composition of DX1 to DX5 on one surface of 10 × 10 cm aluminum, it was cured to form a coating layer.

Experimental example

1. Evaluation of surface appearance

Due to the difference in viscosity of the coating composition, after the coating layer was prepared, sensory evaluation was performed on whether a uniform surface was formed. Whether or not a uniform coating layer was formed was evaluated, and evaluation was performed according to the following criteria.

○: uniform coating layer formation

×: Formation of a non-uniform coating layer

TX1 TX2 TX3 TX4 TX5 sensory evaluation × ○ ○ ○ ×

When the coating layer is formed, if the viscosity is less than a certain level, a flow occurs on the surface of the head part 230, so that it is difficult to form a uniform coating layer after the curing process. Accordingly, there may be a problem in that the production yield is lowered. In addition, even when the viscosity was too high, it was difficult to uniformly apply the composition, making it impossible to form a uniform coating layer. Measurement of corrosion properties

In order to confirm the corrosion characteristics, an aluminum plate without a coating layer was used as a control, and corrosion resistance tests were performed using an aluminum plate with a coating layer of TX1 to TX5.

The aluminum plate was immersed in a beaker containing a 10 wt% CuCl2 aqueous solution, and the degree of corrosion was checked over time.

If the generation of hydrogen gas is confirmed with the naked eye, it will mean that corrosion occurs, and it was confirmed whether corrosion occurred until 24 hours had elapsed.

○: Corrosion

×: No corrosion

TX1 TX2 TX3 TX4 TX5 control corrosion occurs ○ × × × × ○

As a result of the experiment, it was confirmed that the control aluminum plate was placed in a beaker and hydrogen gas was generated shortly thereafter, and copper was precipitated in less than 1 hour. In the case of TX1, hydrogen gas was generated after 3 hours, and copper precipitation was confirmed after 6 hours. In the case of other coating layers, corrosion did not occur even after 24 hours had elapsed, confirming that there was an excellent effect in preventing corrosion.

Although preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention as defined in the following claims are also provided. is within the scope of the

100: mold device,
200: discharge device,
210: guide unit,
220: body part,
230: head,
231: a first head portion;
2311: first adjustment head unit,
2312: first adjustment head unit,
300: discharge oil supply unit
400: winding part,
S: spark,
P: Workpiece, object to be processed.

Claims (8)

a winding unit on which a plurality of wires are wound;
a guide part coupled to the winding part and having a hole through which a plurality of wires pass;
a head part including a first head part to which the first wire is coupled, a second head part to which the second wire is coupled, a third head part to which the third wire is coupled, and a fourth head part to which the fourth wire is coupled; and
Doedoe coupled to the lower end of the guide portion, the body portion to which the head portion is coupled; including,
One of the head parts is selected from among the head parts to perform electric discharge machining of the workpiece.
The winding part is installed on the upper part of the workpiece,
The body part guides the head part to be perpendicular to the upper part of the workpiece,
The first head portion,
a first needle part to which the wire is sent; and
Including; a first adjustment head to which the first needle portion is coupled,
The first adjustment head portion is coupled to the body portion, the elevating and descending toward the main body portion
Electric discharge machining mold device.
delete delete delete According to claim 1,
a rolling part coupled to the inside of the guide part; and
It further includes; a sending unit coupled to the inside of the head unit;
The rolling unit is to transfer and supply the wire supplied from the winding unit to the sending unit
Electric discharge machining mold device.
6. The method of claim 5,
The sending unit transfers the wire to the first needle part, which forms a tension in the wire
Electric discharge machining mold device.
7. The method of claim 6,
The guide unit,
Includes a control unit for adjusting the torque value according to the type of the wire,
The control unit includes an adjustment push unit for pressing the rolling unit;
which includes; a display unit displaying a torque value
Electric discharge machining mold device.
8. The method of claim 7,
The rolling part and the sending part are in the form of a pair of rollers
Electric discharge machining mold device.

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