JP2008087078A - Electric discharge machining device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the generation of bubbles by easing the pressure of processing liquid hastily sent in a processing trough, and to realize stable electric discharge machining. <P>SOLUTION: The electric discharge machining device 1 comprises the processing trough 8 immersing workpiece W in the processing liquid to process that, a reservoir tank 10 collecting and storing the processing liquid in the processing trough 8, and a hastily sending tank 20 storing the processing liquid pumped up from the reservoir tank 10 and hastily sending the stored processing liquid to the processing trough 8. The processing trough 8 is provided with obstructing plates 8f, 34a, 34b, and an elastic member 40 so as to collide with the processing liquid hastily sent from the hastily sending tank 20. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electric discharge machining apparatus including a rapid feed tank that rapidly feeds a machining liquid to a machining tank.

In general, an electric discharge machining apparatus generates a continuous discharge by applying a required machining voltage between a work electrode and a tool electrode that are arranged to face each other with a predetermined electric discharge machining gap (hereinafter referred to as a gap). The workpiece and the tool electrode are moved relative to each other, and the workpiece is machined into a desired shape. The discharge energy is reduced due to machining waste and tarted machining fluid generated between the electrodes during machining ( In order to avoid discharge delays, etc., the workpiece is immersed in a machining tank filled with a machining fluid, and electrical discharge machining is performed while continuously removing machining debris generated between the electrodes by the machining fluid. In this electric discharge machining apparatus, as disclosed in Patent Document 1 to Patent Document 3, an expedited tank (an auxiliary tank in Patent Document 1, a fill tank in Patent Document 2, and a patent tank 3 in a position above the machining tank) Sub-tanks) are often provided, and at the start of machining, in order to quickly send the machining fluid to the machining tank in a short time, the rapid feed line (rapid flow path) that connects the rapid feed tank and the machining tank is opened and the head difference It was set as the structure which rapidly sends a processing liquid to a processing tank using.

International Publication Number WO01 / 036139 JP-A-5-4117 JP-A-5-42424

By the way, there are water-based and oil-based machining fluids used in the electric discharge machining apparatus described above, and oil-based machining fluids are often used in recent electrical discharge machining that requires machining accuracy. Yes. However, oil-based machining fluid has relatively high viscosity, and when it comes into contact with air with a predetermined impact, air is entrained and bubbles are generated, making it difficult to visually recognize the inside of the processing tank, or generating arc discharge during machining, etc. There was a risk of hindering electrical discharge machining.

  In particular, in the electric discharge machining apparatus provided with the rapid feed tank described above, the machining liquid is rapidly sent to the machining tank, so the pressure of the machining liquid is large, and the machining liquid is filled into the machining tank, so that the machining liquid flows from the lower side of the liquid surface. Even in the case of rapid delivery, a large pressure of the working fluid acts and the liquid surface often jumps and entrains air, and the generation of bubbles has become a serious problem.

  The present invention has been made in view of such circumstances, and it is an electrical discharge machining apparatus capable of relaxing the pressure of a machining liquid that is rapidly sent in a machining tank to suppress the generation of bubbles and realizing stable electrical discharge machining. For the purpose of provision.

In order to achieve the above object, the invention of claim 1 is a processing tank for immersing a workpiece in a processing liquid, a storage tank for collecting and storing the processing liquid in the processing tank, and a processing pumped from the storage tank. In the electric discharge machining apparatus that includes a rapid-feeding tank that stores the liquid and rapidly sends the stored machining liquid to the machining tank, the machining tank has a pressure relief structure that relaxes the pressure of the machining liquid that is rapidly sent from the rapid-feed tank. It is characterized by.

According to the present invention, since the processing tank is provided with a pressure relaxation structure that relieves the pressure of the processing liquid that is rapidly sent from the rapid feeding tank, the pressure of the processing liquid that is rapidly sent to the processing tank is relaxed, and the processing tank It is possible to suppress the generation of bubbles due to the liquid level jumping up inside. Note that the “pressure relaxation structure” includes various structures that relieve the pressure of the working fluid that is rapidly sent from a quick delivery tank such as a baffle plate or an elastic member.

The invention according to claim 2 is a processing tank for immersing a workpiece in a processing liquid, a storage tank for collecting and storing the processing liquid in the processing tank, and storing and storing the processing liquid pumped up from the storage tank. An electric discharge machining apparatus including a rapid-feeding tank that rapidly sends a machining liquid to a machining tank, wherein the machining tank includes a baffle plate so as to collide with a machining liquid that is rapidly sent from the rapid-feed tank.

According to the present invention, since the processing tank is provided with the baffle plate so as to collide with the processing liquid rushed from the rapid feeding tank, the pressure of the processing liquid when the rushed processing liquid collides with the baffle plate. Is definitely mitigated.

The invention of claim 3 is a processing tank for immersing a workpiece in a machining fluid, a storage tank for collecting and storing the machining fluid in the machining tank, and storing and storing the machining fluid pumped from the storage tank. An electric discharge machining apparatus including a rapid-feeding tank that rapidly sends a machining liquid to a machining tank, wherein the machining tank includes an elastic member so as to collide with a machining liquid that is rapidly sent from the rapid-feed tank.

According to the present invention, since the processing tank is provided with the elastic member so as to collide with the processing liquid that is rapidly transmitted from the rapid-feeding tank, the pressure of the processing liquid when the processing liquid that is rapidly transmitted collides with the elastic member. Is definitely mitigated. In the present invention, when the machining fluid collides with the elastic member, the elastic force of the elastic member acts to relieve the pressure of the machining fluid more reliably. Providing an elastic member is particularly effective. In addition, in claim 1 to claim 3, the “working fluid rushed from the rushing tank” includes an upward flow generated by the machining fluid rushing from the rushing tank colliding with the bottom surface of the processing tank or the contents. To include.

The invention according to claim 4 is a processing tank for immersing a workpiece in a processing liquid, a storage tank for recovering and storing the processing liquid in the processing tank, and storing and storing the processing liquid pumped up from the storage tank. In an electric discharge machining apparatus comprising a rapid-feed tank for rapidly feeding a machining fluid to a machining tank, the machining tank is connected to a jetting part from which a machining liquid rapidly sent from the rapid-feeding tank is jetted and a machining part for machining a workpiece via a partition wall. A relay joint that relays the processing fluid rushed from the express tank and ejects it to the ejection part is housed inside the ejection part, and the relay joint ejects the urgently sent machining liquid downward. It has an outlet, and a baffle plate or an elastic member is provided in the vicinity of the jet outlet.

According to the present invention, the processing tank is divided through the partition wall into the ejection part from which the machining liquid that is rapidly sent from the rapid delivery tank is ejected, and the machining part that processes the workpiece, and the processing tank that is suddenly sent from the rapid delivery tank. A relay joint that relays the liquid and ejects it to the ejection part is housed inside the ejection part, and the relay joint has an ejection port that ejects the rapidly-fed processing liquid downward, and is in the vicinity of the ejection port. Since the plate or the elastic member is provided, the upward flow generated when the machining liquid ejected downward from the ejection port collides with the bottom surface of the processing tank and the baffle plate or the elastic member reliably collide with the upward flow. Can be relieved. In the present invention, when the upflow of the working fluid collides with the elastic member, the elastic force of the elastic member acts to relieve the pressure of the upflow more reliably. Employing an elastic member is particularly effective when larger.

If the relay joint is housed inside the ejection portion so that the ejection port of the relay joint is located near the bottom surface of the ejection portion of the processing tank, the baffle plate or the elastic member and the bottom surface of the processing tank are close to each other. Therefore, the baffle plate or the elastic member can be more reliably collided with the upward flow generated when the machining liquid ejected downward from the machining liquid ejection port collides with the bottom surface. Also, when the machining liquid is ejected into an empty machining tank, it is preferable because the machining liquid ejected from the ejection port can mitigate the impact when colliding with the bottom surface of the machining tank (Claim 5).

According to the present invention, it is possible to suppress the generation of bubbles in the processing tank and realize stable electric discharge machining.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a right side view schematically showing the electric discharge machining apparatus 1 according to the first embodiment of the present invention. Referring to FIG. 1, the outline of the electric discharge machining apparatus 1 will be described. The electric discharge machining apparatus 1 includes a bed 2 that forms the base of the apparatus 1, a column 3 that stands on the rear upper surface of the bed 2, and an upper surface of the column 3. A ram 4 mounted on the front surface of the ram 4, a machining head 6 mounted on the front surface of the ram 4 and provided with a tool electrode 5, a surface plate 7 provided on the front side of the bed 2 and having a work W disposed thereon, and a surface plate 7, a processing tank 8 for immersing the workpiece W in the processing liquid, a work table 9 on which the processing tank 8 is placed, and the sewage in the processing tank 8 is collected and clarified and stored, and the stored processing It has a storage tank 10 for supplying the liquid to the processing tank 8, performs electric discharge machining while generating electric discharge between the electrodes by a power supply device (not shown), and the processing liquid between the processing tank 8 and the storage tank 10. The processing tank 8 is filled with a clear processing fluid. The The ram 4 contains a Y-axis motor 11y, the machining head 6 contains a Z-axis motor 11z, and the work table 9 contains an X-axis motor 11x (moving means for the machining tank 8). The relative positional relationship between the tool electrode 5 and the workpiece W can be appropriately set by controlling the motors 11x to 11z.

An express tank 20 is provided above the processing tank 8 via a gantry 12. As shown in FIG. 2, the express tank 20 stores the processing liquid pumped from the storage tank 10 via the supply pump A, and processes the stored processing liquid via the express flow path B while utilizing the head difference. It is configured to rush to the tank 8, and the relay joint 30 is disposed on the rushing passage B.

The relay joint 30 has a function of relaying the processing liquid rushed from the urgent tank 20 and ejecting it to the processing tank 8, and as shown in FIG. 3, the main body 31, the hopper 32, and the liquid feeding pipe 33 are connected. I have.

The main body 31 has a rectangular parallelepiped shape with a hollow inside, and the processing liquid rapidly sent from the quick-feed tank 20 flows into the main body 31. That is, a machining fluid inlet 31 a is provided on the right side of the main body 31, and the machining fluid rushed from the rapid feed tank 20 flows into the inlet 31 a.

The hopper 32 is attached to the lower end of the main body 31 so as to communicate with the main body 31. The hopper 32 has the same width dimension as the main body 31 and is formed so that the depth dimension gradually decreases, and has a function of gradually decreasing the cross-sectional area of the flow path through which the machining fluid flows.

The liquid feeding pipe 33 is attached to the lower end of the hopper 32 so as to communicate with the hopper 32. The liquid feed pipe 33 is formed wide and has a long structure below, and the flow path is long in the flow direction of the processing liquid in a state where the cross-sectional area of the flow path is reduced by the hopper 32. It has the function to eject the processing liquid that is rapidly sent to the processing tank 8.

At the lower end of the liquid feeding pipe 33, a machining liquid jet 34 is provided, and in the vicinity of the machining liquid jet 34, baffle plates 34 a and 34 b are provided. The baffle plates 34 a and 34 b are provided so as to extend in the horizontal direction from the lower ends of the front and rear surfaces of the liquid feeding pipe 33 over the entire width direction of the liquid feeding pipe 33.

As shown in FIG. 4, the relay joint 30 configured as described above is housed so as to be inserted directly under the upper end opening of the processing tank 8 while being fixed to the fixed portion 3 a of the column 3. That is, the processing tank 8 has a narrow ejection portion 8b from which the processing liquid rushed from the rapid feeding tank 20 is ejected by the partition wall 8a, and a processing portion 8c that includes the surface plate 7 and processes the workpiece W by immersing the workpiece W in the processing liquid. The relay joint 30 is accommodated in the ejection part 8b.

Note that the partition wall 8 a has a first spacing portion 8 d between the bottom surface of the processing tank 8 and a second spacing portion 8 e between the upper end of the rear surface of the surface plate 7 and the left and right sides of the processing tank 8. It is fixed to the side wall, and a flow path is formed so that the machining fluid ejected to the ejection portion 8b through the first spacing portion 8d and the second spacing portion 8e flows to the machining portion 8c. . This flow path is located on the expediting flow path B, and the second separating portion 8e is the end of the expediting flow path B. Further, the relay joint 30 is stored in the processing tank 8 in a non-contact state, and the relay joint 30 and the processing tank 8 do not interfere even when the processing tank 8 moves in the X-axis direction.

In the retracted state of the relay joint 30, the flow passage cross-sectional area of the machining liquid is gradually reduced by the hopper 32, and the flow passage is in the flow direction of the machining liquid while the flow passage cross-sectional area is further reduced by the liquid feeding pipe 33. Since it is set to be long, the machining liquid is rectified inside the relay joint 30 and ejected into the machining tank 8 even when the machining liquid is rapidly sent from the rapid delivery tank 20 to form a large turbulent flow. The generation of bubbles due to the liquid level jumping up can be suppressed.

Further, baffle plates 34a and 34b are provided in the vicinity of the machining liquid outlet 34 so as to extend horizontally from the lower ends of the front and rear surfaces of the liquid feed pipe 33. When the machining liquid is ejected downward, the upward flow generated when the machining liquid collides with the bottom surface of the machining tank 8 collides with the baffle plates 34a and 34b, and the flow path is such that the upward flow spreads in the horizontal direction. Turn. Therefore, the pressure of the upward flow is relaxed, and the generation of bubbles due to the liquid surface jumping up can be suppressed.

Further, in this stored state, the relay joint 30 is stored so that the processing liquid jet port 34 is exposed from the lower end of the partition wall 8 a and is positioned near the bottom surface of the processing tank 8. Thereby, since the baffle plates 34a and 34b and the bottom surface of the processing tank 8 are close to each other, the baffle plates 34a and 34b and the upward flow generated when the machining liquid ejected downward from the ejection port 34 collides with the bottom surface, Can be more reliably collided. Further, even when the machining liquid is rapidly sent to the empty machining tank 8, the impact when the machining liquid ejected from the machining liquid ejection port 34 collides with the bottom surface of the machining tank 8 can be reduced.

A baffle plate 8f is also provided on the rear wall side of the processing tank 8 over the entire width direction of the rear wall and in the vicinity of the spout 34 of the relay joint 30, and the baffle plate 8f is also horizontally disposed from the rear wall. It is provided to extend. Therefore, the upward flow of the machining fluid can also reliably collide with the baffle plate 8f, and the pressure relaxation effect of the upward flow of the machining fluid can be further improved.

The baffle plate 8 f is positioned slightly above the baffle plate 34 b provided on the rear surface of the relay joint 30, and a processing liquid that rises in the vicinity of the rear wall of the processing tank 8 is provided on the rear surface of the relay joint 30. Even in the case of further rising without colliding with the baffle plate 34b, the upward flow surely collides with the baffle plate 8f.

The baffle plates 8f, 34a, and 34b described above are formed by bending a flat plate into an L shape, and can be easily installed in the ejection portion 8b of the narrow processing tank 8, so that the compactness of the processing tank 8 is achieved. It can contribute to the conversion.

An elastic member 40 is provided at the end of the expediting flow path B so as to close the second separating portion 8e. The elastic member 40 is composed of a member that is rich in elasticity and also has water absorption and water permeability. For example, the elastic member 40 is composed of a sponge-like member. The elastic member 40 is formed in a rectangular parallelepiped shape as shown in FIG. 5, and is mounted on the lower end of the partition wall 8a while being compactly stored in the storage box 40a. The storage box 40a has a plurality of openings at the bottom, and the top is closed by a flat plate.

Therefore, when the machining fluid ejected to the ejection portion 8b collides with the rear surface of the surface plate 7 and an upward flow is formed, the elastic member 40 is mounted so as to close the second separation portion 8e. Therefore, the upward flow collides with the elastic member 40 through the opening of the storage box 40a, the pressure of the upward flow is relaxed, and the generation of bubbles in the processing tank 8 can be suppressed.

In some cases, the machining fluid ejected to the ejection portion 8b of the processing tank 8 collides with the rear surface of the surface plate 7 to form a larger upward flow. However, since the elastic force of the elastic member 40 acts, the pressure of the upward flow is It is definitely mitigated. Since the elastic member 40 is stored in the storage box 40a in a compact manner and is attached to the lower end of the partition wall 8a, the elastic member 40 can be easily installed in the narrow second separation portion 8e, and the processing tank 8 can be made compact. Contribute.

As shown in FIG. 6, the elastic member 40 is provided so as to form a gap 8 g between the left and right side walls of the processing tank 8, and the upward flow that collides with the elastic member 40 flows through the flow path in the horizontal direction. Then, it flows out to the processing portion 8c of the processing tank 8 through the gap 8g.

Next, 2nd Embodiment and 3rd Embodiment of this invention are described based on FIG. 7 and FIG.
The second embodiment of the present invention employs a configuration in which a baffle plate 8h is further added to the ejection portion 8b of the processing tank 8 of the first embodiment. Specifically, as shown in FIG. 7A, the baffle plate is also provided on the wall surface of the partition wall 8 a facing the relay joint 30 so as to extend in the horizontal direction in the vicinity of the processing liquid jet port 34. 8h is provided, and the upward flow of the machining fluid collides with the baffle plate 8h, so that the pressure relaxation effect of the upward flow is further improved. The baffle plate 8h is positioned slightly above the baffle plate 34a provided on the front surface of the liquid feeding pipe 34, and the upward flow of the machining liquid further rises without colliding with the baffle plate 34a. However, this upward flow surely collides with the baffle plate 8h. When the pressure of the upward flow is larger, an elastic member 41 composed of a sponge-like member is provided instead of the baffle plates 8f, 8h, 34a, 34b as shown in FIG. 7 (c), baffle plates 8f, 8h, 34a, and 34b may be provided, and an elastic member 41 may be provided on the bottom surface of the processing tank 8 facing the processing liquid jet 34.

3rd Embodiment of this invention has shown the structure etc. which extended the mounting | wearing range of the elastic member 40 of 1st Embodiment. Specifically, as shown in FIG. 8A, an elastic member 42 composed of a sponge-like member is attached so as to cover the entire rear surface of the surface plate 7 while closing the second spacing portion 8e. The baffle plates 34 a and 34 b collide with the working fluid that has turned the flow path in the horizontal direction and the elastic member 42, and the upward flow generated after the collision collides with the elastic member 40. In addition, as shown in FIG.8 (b), when the pressure of the upward flow of a process liquid is relatively small, it replaces with the elastic member 40 of 1st Embodiment, and it obstruct | occludes so that the 2nd separation | spacing part 8e may be obstruct | occluded. It is good also as providing the board 8i.

  The present invention can be used for an electric discharge machining apparatus. Specifically, it is useful for suppressing the generation of bubbles in the processing tank in the case of providing a rapid delivery tank.

It is a right view which shows the whole structure of the electric discharge machining apparatus which concerns on 1st Embodiment of this invention. It is a systematic diagram which shows each flow path of the supply of the machining fluid of the electrical discharge machining apparatus, and rapid dispatch. It is a perspective view which shows the structure of a relay tank. It is a figure for demonstrating the accommodation state of a relay tank. It is a perspective view for demonstrating the structure of a sponge-like elastic member. It is a top view of the processing tank for demonstrating the mounting range of a sponge-like elastic member. It is a figure for demonstrating 2nd Embodiment of this invention. It is a figure for demonstrating 3rd Embodiment of this invention.

Explanation of symbols

A: Supply pump B: Rapid flow path
W: Work 1: Electrical discharge machining device 2: Bet 3: Column 4: Ram 5: Tool electrode 6: Machining head 7: Surface plate 8: Machining tank 8a: Bulkhead 8b: Ejection part 8c: Machining part 8d: First separation Portion 8e: Second separation portion 8f: Baffle plate 8g: Clearance 8h: Baffle plate 8i: Baffle plate 9: Work table 10: Storage tank 11: Motor 12: Mount 20: Rapid transfer tank 30: Relay joint 31: Main body 32: Hopper 33: Liquid feed pipe 34: Processing liquid jet 34a: Baffle plate 34b: Baffle plate 40: Elastic member 40a: Storage box 41: Elastic member 42: Elastic member

Claims (5)

A processing tank that immerses and processes the workpiece in the processing fluid;
A storage tank for collecting and storing the processing fluid in the processing tank;
While storing the processing liquid pumped up from the storage tank, and a rapid delivery tank for rapidly sending the stored processing liquid to the processing tank,
In an electric discharge machining apparatus comprising:
The electric discharge machining apparatus according to claim 1, wherein the machining tank includes a pressure relaxation structure that relaxes the pressure of the machining liquid rapidly sent from the rapid delivery tank. A processing tank that immerses and processes the workpiece in the processing fluid;
A storage tank for collecting and storing the processing fluid in the processing tank;
While storing the processing liquid pumped up from the storage tank, and a rapid delivery tank for rapidly sending the stored processing liquid to the processing tank,
In an electric discharge machining apparatus comprising:
The electric discharge machining apparatus according to claim 1, wherein the machining tank includes a baffle plate so as to collide with a machining liquid that is rushed from the rapid feeding tank. A processing tank that immerses and processes the workpiece in the processing fluid;
A storage tank for collecting and storing the processing fluid in the processing tank;
While storing the processing liquid pumped up from the storage tank, and a rapid delivery tank for rapidly sending the stored processing liquid to the processing tank,
In an electric discharge machining apparatus comprising:
The electric discharge machining apparatus according to claim 1, wherein the machining tank includes an elastic member so as to collide with a machining liquid that is rapidly sent from the rapid-feed tank. A processing tank that immerses and processes the workpiece in the processing fluid;
A storage tank for collecting and storing the processing fluid in the processing tank;
While storing the processing liquid pumped up from the storage tank, and a rapid delivery tank for rapidly sending the stored processing liquid to the processing tank,
In an electric discharge machining apparatus comprising:
The processing tank is divided through a partition wall into an ejection part from which the machining liquid rushed from the rapid delivery tank is ejected and a machining part to process the workpiece, and the machining liquid urgently delivered from the rapid delivery tank. A relay joint that relays and jets to the jet part is housed in the jet part, and the relay joint has a jet outlet that jets the rapidly sent working liquid downward,
An electric discharge machining apparatus, wherein a baffle plate or an elastic member is provided in the vicinity of the ejection port. 5. The electric discharge machining apparatus according to claim 4, wherein the relay joint is housed in the ejection portion so that the ejection port of the relay joint is positioned near the bottom surface of the ejection portion of the machining tank.

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