JP3220892B2 - Machining tank door clamp mechanism of electric discharge machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric discharge machining apparatus for machining a workpiece into a desired shape by using discharge energy between a workpiece and a conductive workpiece. The present invention relates to an improvement in a clamping mechanism of a processing tank door when processing by immersing the processing tank in a processing liquid.

[0002]

2. Description of the Related Art FIGS. 9A and 9B are schematic views showing a machining tank portion of a conventional electric discharge machine, wherein FIG. 9A is a plan view and FIG. 9B is a front view . In the figure, reference numeral 1 denotes a processing tank, which is installed on an XY cross table of a machine body (not shown).
The table 3 is provided inside, and the workpiece 6 is immersed in the working fluid. 10 is a processing tank door, a side surface of the machining tank 1 by a hinge 15, which is rotatably held, the machining tank 1
The open portion is configured to be able to be closed via a packing 19. Reference numeral 20 denotes a processing tank door clamp mechanism, and the processing tank door 1
Lever 2 having a shaft passing through 0 and fixed rotatably
2 and a spacer 2 provided between the processing tank 1 and the lever 22
3 and 24 and a clamp 27 that is engaged with a cam 25 fixed to the processing tank 1.

FIGS. 10A and 10B are schematic views showing the operation of a clamping mechanism of a machining tank of a conventional electric discharge machine, wherein FIG. 10A shows a state in which the clamping mechanism is opened, and FIG. FIG. 3 is a view showing a state in which the working fluid is closed so that the machining fluid does not leak. Cam 25 fixed to processing tank 1 and processing tank door 1
The clamps 27 installed at 0 are in a substantially parallel positional relationship without biting. Next, the operation will be described. First, the lever 22 of the clamp mechanism 20 is rotated, and the processing tank 1 is rotated.
And the clamp 27 installed on the processing tank door 10 are engaged. By further rotating,
The rotation torque of the lever 22 is converted into a force in a direction for closing the door according to the inclination angle of the cam 25. With this force, the processing tank door 10 presses the packing 19 against the processing tank 1 side, and seals the packing 19 by crushing it.

[0004]

Since the conventional electric discharge machining apparatus is constructed as described above, it is necessary to rotate the lever 22 when the machining tank door 10 is sealed, and the workability is good. Not only that, but if the rotating force is necessary and insufficient, the working fluid in the working tank may leak out of the tank. Also, even when changing the water level during processing, even if there is no leakage at low water level, by raising the water level, the water pressure acting on the processing tank door increases, the direction opposite to the tightening torque,
That is, a force acts in a direction to loosen the lever 22, and there is a possibility that the working fluid leaks out, which causes a problem that the unmanned operation cannot be performed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the tightening force for sealing the processing tank door acts evenly and sufficiently, so that the processing liquid in the processing tank can be removed. An object is to obtain a clamp mechanism that does not leak out of the tank.

[0006]

SUMMARY OF THE INVENTION In a machining tank door clamp mechanism of an electric discharge machine according to the present invention, a machining tank having an open portion, and an open portion of the machining tank which is rotatably held by the machining tank and is opened and closed. A door, an arm rotatably provided on the outer surface of the processing tank on the side on which the door opens and closes, a latch provided on the door, which is hooked to the arm, and a direction installed on the arm to clamp the door. A working weight, and an unclamping mechanism provided on an outer surface of the processing tank on the side on which the door is opened and closed, and acting on the arm in an opening direction from the latch.

A processing tank having an open portion, a door for opening and closing the open portion of the processing tank, an arm rotatably provided on an outer surface of the processing tank on a side on which the door opens and closes, and the door; A spring that applies a pressing force to the arm in a direction in which the door is clamped, and a top that has a substantially spherical top end for transmitting the force for clamping the door to the arm by the spring. And a dent in which the spherical top provided on the arm fits,
The box includes a box in which the spring and the spherical top are incorporated and is configured to be rotatable, and an unclamping mechanism that acts on the arm in an opening direction from the latch.

Further, an arm rotatably provided on the outer surface of the processing tank on the side on which the door is opened and closed has a right-angled or acute-angled holding portion at a tip end thereof, and a latch provided on the door and hooked with the arm. Has a substantially circular cross section.

[0009]

The arm in the present invention draws the processing tank door to the processing tank and seals it. Also, the latch transmits the force from the arm to the processing tank door when the arm draws the processing tank door. In addition, the weight generates a force that is greater than the force of the working fluid stored in the processing tank and pulls the processing tank door of the arm, and the unclamping mechanism cancels the force generated by the weight that pulls the processing tank door. Open the door seal.

The spring according to the present invention generates a force for pulling the processing tank door of the arm, and the top having a substantially spherical top and the recess and the box of the arm eliminate the spring from being twisted and the arm without loss of force. To act on.

Further, the right-angled or acute-angled holding portion provided at the tip of the arm and the latch having a substantially circular cross section enhance the clamping force by the arm against the pressure in the door opening direction due to the working fluid after clamping, or Convert to a direction that does not open, preventing the door from opening.

[0012]

【Example】

Embodiment 1 FIG. Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of the entire processing tank, FIG. 2A is a detailed plan view of a clamp mechanism, and FIG. 2B is a detailed side view. In the figure, reference numeral 30 denotes an arm, which is rotatably supported on the processing tank 1 by a rotating shaft 32. 34 is a weight,
The arm 30 is connected to the connecting bar 36. An unclamping mechanism 38 uses an air cylinder in this embodiment. This unclamping mechanism 38 is also rotatably supported at one end by the rotary shaft 40 on the processing tank 1 and rotatably mounted at the other end to the arm 30 via the rotary shaft 42. Reference numeral 45 denotes a latch, which is fixed to the tip of a connecting bar 46 protruding from the processing tank door 10.

Next, the operation of the present invention will be described. 3A shows a state where the clamping mechanism is clamping the processing tank door, and FIG. 3B shows an unclamped state. When the clamping mechanism clamps the processing tank door, first, the processing tank door 10 is held at a position covering the opening of the processing tank 1. Thereafter, the unclamping mechanism 38 is released.
That is, in this embodiment, the air of the air cylinder is cut off, and the action of the pressing force on the arm 30 is eliminated. As a result, the arm 30 can freely rotate about the fulcrum 32, and the weight 34 connected thereto moves downward from its raised position by its own weight. That is, the arm 30 rotates counterclockwise, and the holding portion provided at the distal end of the arm 30 is engaged with the latch 45 provided on the processing tank door 10.
And pull the processing tank door 10 toward the processing tank 1 side,
The packing 19 is crushed to make it a sealed state. At this time, the length change due to the expansion and contraction of the air cylinder
Absorption by rotation around 2 and prying due to excessive force do not cause malfunction.

When the door is opened, the air is supplied to the air cylinder 38 to generate a force in the direction of pushing down the arm 30, contrary to the above-described clamping procedure. Thereby, the arm 30 is rotated and lifted around the fulcrum 32 together with the weight 34. As a result, the holding portion at the end of the arm is disengaged from the latch 45 provided on the processing tank door 10, and the processing tank door 10 and the processing tank 1 are opened. afterwards,
The processing tank door 10 can be freely opened and closed.

Embodiment 2 FIG. FIG. 4 is an operation schematic diagram of a clamp mechanism of an electric discharge machine according to Embodiment 2 of the present invention.
(A) is a figure which shows a clamp state, (b) is a figure which shows an unclamped state. In the drawing, reference numeral 60 denotes a spring, 63 denotes a box, and the box 63 is rotatably fixed to the processing tank 1 via a fulcrum 65, and houses the spring 60 therein. Numeral 67 designates a top having a substantially spherical top, which fits into the box 63 and has a spring 60 and an arm 30.
And transmits the repulsive force of the spring 60 to the arm 30. Reference numeral 68 denotes a recess provided in the arm 30 and engages with the spherical top 67.

Next, the operation will be described. In the figure,
When clamping the processing tank door 10, first, the processing tank door 10 is held at a position covering the opening of the processing tank 1. Thereafter, the unclamping mechanism 38 is released. That is, in this embodiment, the air of the air cylinder is cut off, and the action of the pressing force on the arm 30 is eliminated. As a result, the arm 30 can freely rotate about the fulcrum 32, and the spring 60
The top 67 slides inside the box 63 and moves downward. That is, the arm 30 rotates counterclockwise, the holding portion provided at the tip of the arm 30 is hooked on the latch 45 provided on the processing tank door 10, and the processing tank door 10 is pulled toward the processing tank 1, Packing 1
9 is crushed to obtain a sealed state. At this time, box 63
Is rotated by the fulcrum 65, so that the spring 60 is compressed almost vertically even when the arm 30 rotates. Also,
The length change due to the expansion and contraction of the air cylinder
Absorption by the rotation around 42 and displacement of the top and the arm do not occur because they are fitted together. For this reason, there is no possibility that prying will occur due to excessive force and malfunction will not occur.

When the door is opened, air is supplied to the air cylinder 38 to generate a force in a direction to push down the arm 30, contrary to the above-described clamping procedure. Thus, the arm 30 rotates clockwise about the fulcrum 32 while compressing the spring 60 almost vertically via the top 67. As a result, the holding portion at the end of the arm is
The processing tank door 10 and the processing tank 1 are opened by releasing from the latch 45 provided at 0. Thereafter, the processing tank door 10 can be freely opened and closed.

Embodiment 3 FIG. FIG. 5 is a detailed view showing a clamp mechanism of an electric discharge machine according to Embodiment 3 of the present invention. In the figure, 50 is a latch having a substantially circular cross section,
It is fixed to the tip of a connecting bar 46 protruding from the processing tank door 10. Reference numeral 52 denotes an arm having a right-angled or acute-angled holding portion 53 at the distal end, and is rotatably supported by the rotating shaft 32 in the processing tank 1 as in the first embodiment.

FIG. 6 is a schematic view showing the operation of the clamp mechanism of the electric discharge machine according to the third embodiment of the present invention. Since the mechanism for clamping and unclamping the processing tank door 10 is the same as that in the first embodiment, the balance and operation of the force applied to the processing liquid pressure acting on the processing tank door will be described. FIG. 6 schematically shows the balance of the force exerted on the processing tank door with respect to the processing liquid pressure, and shows the force by which Fa attempts to open the processing tank door due to the processing liquid pressure acting on the processing tank door. This force is determined by the size of the processing tank door, width 1m, height 0.
At 5m, the force is about 13N. The Fa acting on the processing tank door is transmitted to the latch 50 having a substantially circular cross-sectional shape via the connecting bar 46, and further transmitted to the arm 52. The force acting on the Fa arm at this time is
Since 0 is almost circular and is pressed against the holding portion 53 of the arm 52 by point contact, the force Fa0 acting on the arm is given by Fa0 = Fa × cos θ, where θ is the angle of the holding portion.

Here, since the holding portion 53 is a right angle or an acute angle, the component force is fx = Fa0 × sinθ fy = Fa0 × cosθ, and fy acts in a direction to strengthen the arm 52 in the clamping direction, or At worst, even in the case of a right angle, no force acts in the unclamping direction. Therefore, even if the liquid level in the processing tank does not change and the hydraulic pressure acting on the processing tank door changes, the processing tank door does not open and leakage of the processing liquid does not occur.

In the first embodiment, an air cylinder is used for the unclamping mechanism 38. However, in the case of another mechanism, for example, in the case of operating automatically, other mechanisms such as a linear moving mechanism using a motor and a rack and pinion, a cam mechanism, and the like are used. The use of a mechanism is also possible. Further, even if the operator manually operates the vicinity of the operation point of the unclamping mechanism, the effect is the same and the cost can be reduced.

Further, if the latches 45 and 50 are configured to be rotatable using, for example, bearings, there is no loss of clamping force due to friction between the arm and the latch during clamping, and smooth operation during unclamping. Will be possible.

In the above embodiment, the weight is a separate fixed part. For example, if the weight is fixed in a sliding manner as shown in FIG. 7, in the case of a machine having a large processing tank capacity, the mounting position is separated from the center of rotation. By fixing, a strong clamping force can be applied without changing the structural parts, and the parts can be standardized.

The same effect can be expected by changing the weight of the tip of the arm according to the capacity of the processing tank as shown in FIG.

[0025]

Since the present invention is configured as described above, it has the following effects.

[0026] The clamp mechanism includes an arm provided rotatably, a latch provided on the door and hooked to the arm, a weight installed on the arm and acting in the direction of clamping, and the arm moved in the opening direction from the latch. Since it is constituted by an unclamping mechanism that acts, the tightening force when the processing tank door is sealed acts uniformly and as sufficiently as necessary, and the processing liquid in the processing tank does not leak out of the tank.

[0027] Further, the clamp mechanism includes an arm rotatably provided, a latch provided on the door and hooked to the arm, a spring for applying a pressing force to the arm in a clamping direction, and the arm by the spring. A top having a substantially spherical top for transmitting a clamping force to the arm, a recess provided on the arm for fitting the spherical top, a box incorporating the spring and the top and configured to be rotatable, and latching the arm It is composed of an unclamping mechanism that acts more in the opening direction, so even when the arm rotates, the spring is compressed almost vertically, transmitting the force of the spring to the arm without loss and tightening when closing the processing tank door. The force acts uniformly and as necessary and sufficiently, and there is an effect that the processing liquid in the processing tank does not leak out of the tank.

Further, the right-angled or acute-angled holding portion provided at the tip of the arm and the latch having a substantially circular cross section enhance the clamping force by the arm against the pressure in the door opening direction due to the working fluid after clamping, or Since the direction is changed to the direction not to open and the door is prevented from being opened, there is an effect that the processing liquid in the processing tank does not leak out of the tank.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a machining tank portion of an electric discharge machine according to an embodiment of the present invention.

FIG. 2 is a detailed view showing a clamp mechanism of the electric discharge machine according to one embodiment of the present invention.

FIG. 3 is a schematic view showing an operation of a clamp mechanism of the electric discharge machine according to one embodiment of the present invention.

FIG. 4 is a detailed view showing a clamp mechanism of an electric discharge machine according to Embodiment 2 of the present invention.

FIG. 5 is a detailed view showing a clamp mechanism of an electric discharge machine according to Embodiment 3 of the present invention.

FIG. 6 is a schematic view showing an operation of a clamp mechanism of an electric discharge machine according to Embodiment 3 of the present invention.

FIG. 7 is a detailed view showing a clamp mechanism of an electric discharge machine according to another embodiment of the present invention.

FIG. 8 is a detailed view showing a clamp mechanism of an electric discharge machine according to another embodiment of the present invention.

FIG. 9 is a schematic view showing a machining tank portion of a conventional electric discharge machine.

FIG. 10 is a schematic view showing an operation of a clamping mechanism of a machining tank of a conventional electric discharge machine.

[Explanation of symbols]

1 processing tank, 6 workpiece, 10 processing tank door, 3
0 arm, 32 rotation axis (fulcrum), 34 weight, 36 connecting bar, 38 unclamping mechanism,
40 rotating shaft (fulcrum), 42 rotating shaft (fulcrum), 4
5 Hasp, 46 Connection bar, 50 Hasp, 52
Arm, 53 holding part, 60 spring, 63 box, 65 rotating shaft (fulcrum), 67 frames, 68
A recess provided on the arm 30 for fitting with the spherical top 67.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-295076 (JP, A) JP-A-1-269762 (JP, A) Fully open 55-41274 (JP, U) Fully open 58-1 2596 (JP, U) JP 3-60615 (JP, B2) (58) Fields surveyed (Int. Cl. ⁷ , DB name) B23H 7/00 B23H 1/00

Claims (3)

(57) [Claims] 1. An electric discharge machining apparatus for machining a workpiece by generating a discharge between the electrode and the workpiece with a minute gap between the electrode and the workpiece. A door that is freely held and opens and closes an open portion of the processing tank, an arm rotatably provided on an outer surface of the processing tank on a side where the door opens and closes, and a latch that is provided on the door and is hooked to the arm. A weight installed on the arm and acting in a direction to clamp the door, and an unclamping mechanism provided on an outer surface of the processing tank on the side on which the door opens and closes and acting on the arm in an opening direction from the latch.
A machining tank door clamp mechanism for an electric discharge machine, wherein the door is pressed against and held against the machining tank. 2. An electric discharge machining apparatus for machining a workpiece by generating an electric discharge between the electrode and the workpiece with a minute gap between the electrode and the workpiece. A door that opens and closes a portion, an arm rotatably provided on the outer surface of the processing tank on the side where the door opens and closes, a latch provided on the door and hooked to the arm, and clamping the door by the arm A spring that applies a pressing force in the direction, a tip that transmits a force for clamping the door to the arm by the spring, and a recess that is fitted with a substantially spherical top and a spherical top provided on the arm, A rotatable box containing the spring and the spherical top, and an unclamping mechanism for operating the arm in a direction of opening from the latch, and pressing and holding the door against a processing tank. A machining tank door clamp mechanism for an electric discharge machine. 3. An arm rotatably provided on an outer surface of the processing tank on the side on which the door is opened and closed has a right-angled or acute-angled holding portion at a tip end thereof, and a latch provided on the door and hooked with the arm. 3. A clamping mechanism for a machining tank door of an electric discharge machine according to claim 1, wherein the cross section has a substantially circular cross section.