JPH0644573Y2 - Wire electric discharge machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an improvement of a sealing means for preventing leakage of a machining fluid in a wire electric discharge machining apparatus which performs machining by immersing a workpiece in a machining fluid. .

[Conventional technology]

FIG. 3 is a schematic view showing the configuration of a conventional wire electric discharge machining apparatus. (10) is a wire electrode, (12) is a wire bobbin for supplying the wire electrode (10), and (14) is a braking force for the wire bobbin. A braking device for preventing the wire electrode (10) from loosening, (16) and (18) are pulleys provided to appropriately change the supply direction of the wire electrode (10), and (20) is the pulley. The wire recovery mechanism for discharging the wire electrode (10) out of the device (22) is the wire recovery mechanism (2
Wire collection box for collecting the wire electrode (10) unwound in (0), (24) is a workpiece, (26) is a processing tank, and (28) is integrated with the processing tank (26). Together with the processing tank (26), it is a surface plate on which the workpieces (24) are loaded and held, and constitutes a tank. (30) is a linear guide that serves as a guide for moving the surface plate (28) in a direction perpendicular to the paper surface by a drive device (not shown), (32) is a saddle, and (34) is a saddle (32) shown in a direction parallel to the paper surface. A linear guide that serves as a guide when moving by a drive device, and (36) is a bed on which an XY cross table composed of the surface plate (28) and the saddle (32) is loaded. (38) is a column,
It is loaded and fixed on the bed (36). Reference numeral (40) is an upper wire guide means, in which a wire guide for guiding and supporting the wire electrode (10) and a power supply for supplying processing power are incorporated. (42) is Z with respect to column (38)
With a head that can be moved and fixed in the axial direction,
The upper wire guide means (40) is fixed to the lower end thereof. (44) is a lower wire guide means having an internal structure similar to that of the upper wire guide means (40), and (46) is a lower arm, one end of which is fixed to a column (38) and the other end of which is the lower wire. The guide means (44) is fixed at a position facing the upper wire guide means (40). (Four
Reference numeral 8) is an annular sealing means for preventing the leakage of the processing liquid from the processing structure (26) and the surface plate (28), and its detailed configuration is shown in FIG. In the figure, (50) is a plate corresponding to a machining liquid leakage prevention means for preventing the machining liquid supplied from the upper surface of the surface plate (28) from leaking out of the surface plate (28). The lower arm (46) provided in the (28) is configured to overlap the elongated hole (52) provided so as to be movable in the lateral direction. (54) is a hole provided in the plate (50) for the lower arm (46) to pass through, and (56) is a first seal member between the lower arm (46) and the plate (50). (46) It is configured to be slidable in the axial direction and not leaking. (58) is a second seal member made of a rubber material,
It is provided between the surface plate (28) and the plate (50) and is slidable in the direction perpendicular to the paper surface and has a leak-free structure. (6
2) is an arm that holds the plate (50) at a fixed position with respect to the surface plate (28), and the other end is fixed to the saddle (32).

Next, the operation will be described. When performing wire electrical discharge machining, move the XY cross table and move the wire electrode (1
0) and the work piece (24) are opposed to each other with a minute gap held therebetween, and the working fluid contained in the working tank (26) and the surface plate (28) and the upper and lower wire guide means (40), (). 44) Supplying the working fluid ejected from the wire electrode (10) through the working fluid
A discharge explosion occurs between the workpiece and the workpiece (24). Due to the electric discharge explosion, a part of the wire electrode (10) and the work piece (24) are removed. Since the wire electrode (10) is continuously fed, it is not cut, and the workpiece (24) can be processed into a desired shape by moving the XY cross table in any direction. . The plate (50) in the long hole portion for lateral movement of the lower arm (46) receives hydraulic pressure from the working fluid stored in the working tank (26) and the surface plate (28), and the plate (50) and the lower arm. The gap with (46) is a seal,
Further, the gap between the plate (50) and the surface plate (28) is sealed by a seal (58) to prevent machining fluid leakage.

Here, for example, the stroke of the lower arm (46) in the lateral direction becomes large, and the plate (50) becomes long accordingly, and
Even if the flatness deteriorates as shown in the figure, the seal (58)
Due to the elasticity peculiar to the rubber material, has a crushing allowance that can absorb the variation in the gap between the surface plate (28) and the plate (50), so that no machining liquid leaks from this portion. However, the rubber material has a large coefficient of friction, the sliding resistance between the surface plate (28) and the plate (50) increases, and the positional accuracy of the surface plate (28) in the direction perpendicular to the paper surface decreases, and as a result, the processing accuracy increases. Will be reduced. In order to prevent such problems from occurring, the above seal (58)
May be changed to a Teflon-based material.In this case, the above sliding resistance is not increased, and therefore the processing accuracy does not decrease, but the Teflon-based material has a small elastic coefficient and The squeezing allowance for absorbing the water cannot be taken, and the leakage of the machining liquid occurs, which causes trouble in the machining.

[Problems to be solved by the device]

Since the conventional wire electric discharge machine is configured as described above, when a material with a large elastic coefficient is used for the seal material (58), the sliding resistance between the surface plate (28) and the plate (50) Machining accuracy decreases due to the increase in the work load, and conversely, when a material with a small elastic coefficient is used, the variation in the gap between the surface plate (28) and the plate (50) cannot be absorbed, resulting in leakage of the working fluid. However, there was a problem to be solved, which caused a problem in processing.

The present invention has been made to solve the above problems, and a wire that does not increase the sliding resistance between the tank and the plate and can sufficiently absorb the variation in the gap between the tank and the plate. The purpose is to obtain an electric discharge machine.

[Means for Solving the Problem] A wire electric discharge machining apparatus according to the present invention has a saddle that moves reciprocally along a straight line and an elongated hole through which a lower arm penetrates on one side wall, and is provided on the saddle. And a tank that reciprocally moves on a straight line orthogonal to the movement direction of the saddle, and a hole through which the lower arm penetrates, and one end thereof is fixed to the saddle, and a sealing material is provided between the tank and the tank. In a wire electric discharge machine comprising a plate provided in parallel with the side wall of the tank so as to close the elongated hole of the tank via the sealing material, an annular first sealing material having a high elastic coefficient is used. , Annular second with low sliding resistance
At least one kind of the sealing material is laminated in the gap direction between the tank and the plate, and the second sealing material is arranged so as to be in contact with the plate, and the second sealing material and the plate. The contact portion has a shape of line contact.

[Operation] In this invention, the first sealing material absorbs the variation in the gap between the tank and the plate, and the second sealing material reduces the sliding resistance between the tank and the plate.

[Example of device]

An embodiment of the present invention will be described below with reference to the drawings. First
In the figure, (100) is a second seal material, which is made of a material having a small sliding resistance, for example, a material such as Teflon, and is configured to come into contact with the plate (50). (Ten
2) is a first sealing material, which is made of a material having a large elasticity, such as sponge rubber, and presses the sliding member (100) against the plate (50) and also forms a surface plate (28). Are in contact. The second sealing material (102) and the first sealing material (100) form an annular sealing material corresponding to the conventional sealing means (48), and the second sealing material (102). So that the part that contacts the plate (50) of
It has a circular cross section.

Next, the operation will be described. The wire electric discharge machining is the same as that of the conventional example, and therefore the description thereof is omitted here, and the prevention of machining fluid leakage from the machining tank will be described.

When the plate (50) has a flatness, as shown in FIG. 1, the elastic body (102) is uniformly compressed, and the sliding member (100) is attached to the plate (50) by the elastic member (102). Since it is pressed and sealed by elastic force, no leakage of machining fluid occurs and sliding resistance is small.

When the flatness of the plate (50) is not high, the elastic member (102) is largely deformed in the portion where the clearance between the surface plate (28) and the plate (50) is small as shown in FIG. In addition, in the part where the gap is large, the crushing amount is returned. Due to the deformation of the elastic member (102), the sliding member (100) can maintain the contact state without separating from the plate (50), and the machining fluid does not leak.

[Effect of device]

As described above, according to the present invention, the sealing material provided between the tank and the plate is the annular first sealing material having a high elastic coefficient and the annular second sealing material having a low sliding resistance. And at least one type are laminated in the gap direction between the tank and the plate, and the second sealing material is arranged so as to be in contact with the plate, and the plate of the second sealing material is Since the contacting portion has a line contact shape, the first sealing material absorbs the variation of the gap between the tank and the plate, and the second sealing material reduces the sliding resistance between the tank and the plate. Therefore, the sliding resistance between the tank and the plate does not increase, and the variation in the gap between the tank and the plate can be sufficiently absorbed, so that a wire electric discharge machine that does not hinder machining can be obtained. it can.

[Brief description of drawings]

FIG. 1 is a detailed view showing a sealing portion according to an embodiment of the present invention, and FIG. 2 is a first and a second embodiment according to an embodiment of the present invention.
FIG. 3 is a schematic view showing a conventional wire electric discharge machine, FIG. 4 is a detailed view showing a conventional seal portion, and FIG. 5 is a view showing the function of the conventional seal material. FIG. In the figure, (28) is a surface plate, (32) is a saddle, (50) is a plate, (100) is a second sealing material, and (102) is a first sealing material. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. A saddle which reciprocates on a straight line, and an elongated hole through which a lower arm penetrates on one side wall, and which is provided on the saddle and can reciprocate on a straight line orthogonal to the moving direction of the saddle. A tank which moves to the tank and a hole through which the lower arm penetrates, and one end of which is fixed to the saddle, and the tank is formed so as to close the long hole of the tank through a sealing material between the tank and the tank. In a wire electric discharge machine including a plate provided in parallel with the side wall of the first sealing material, the sealing material includes an annular first sealing material having a high elastic coefficient and an annular second sealing material having a low sliding resistance. And at least one type are laminated in the gap direction between the tank and the plate, and the second sealing material is arranged so as to be in contact with the plate, and the portion of the second sealing material that is in contact with the plate is With a shape that makes line contact Wire electrical discharge machining apparatus characterized by.