JPH02250721A - Structure of nozzle part of wire discharging machine - Google Patents

Abstract

PURPOSE:To feed a sufficient work liquid with the holder of a nozzle part being located at a work start position at all times at the work start time and to eliminate the accident of burning a wire simultaneously with the work start, by interposing a friction engaging member supporting the gravity of the holder on the sliding face and to the degree moved by the work liquid pressure. CONSTITUTION:A friction engaging member 27 provided on the sliding face of a holder 9 and fixed side member 13 holds the holder 9 at an optional position in the wire diameter direction for the fixed side member 13, allowing the holder 9 to move to the tip side by the pressure of a work liquid. At the time of wire connection, the feeding of the work liquid is thus stopped, the holder 9 is manually moved to a base seat 12 side, maintained at this position by the action of the friction engaging member 27, the tip of a dies guide 14 is a bit projected from a nozzle hole 8 and the gap with the work surface is enlarged. Wire connection is executed in this state and after completion of the wire connection, a work liquid is fed to a nozzle part 5 through a flow pass 25, the holder 9 is moved to the work position of the tip side and the discharging is pre-opened.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to the structure of a nozzle section attached to the upper and lower guide sections of a wire electrical discharge machine.

The conventional wire electric discharge machine has an upper guide part 2 and a lower guide part 3 facing each other so as to sandwich a workpiece 1 therebetween, as shown in FIG. The nozzle part 5 provided with the workpiece 1 is used in close proximity to the upper and lower surfaces of the workpiece 1 (distance a...approximately 0.2 mm).
).

The upper and lower guide parts 2.3 each consist of a machine frame 6 and the nozzle part 5, and the machine frame 6 is provided with an electric current supply mechanism and a machining fluid supply mechanism inside. The energizing mechanism supplies discharge power to the wire 4 as an electrode, and the separate machining fluid supply tank is for spouting machining fluid from the nozzle portion 5 to the machining position.

As schematically shown in Fig. 3.4, the nozzle part 5 consists of a fixed member 7 and a cylindrical holder 9 with a nozzle hole 8 at its tip.The holder 9 has a sliding surface on the fixed member 7. , and is movable in the direction of the wire path C.

Note that the wire path C is set at the center of the fixed side member 7,
The axis of the holder 9 coincides with this path C.

The holder 9 and the fixed member 7 are conventionally provided with positioning means in the direction of the wire path C as shown in FIG. This means includes an engaging claw 11 on the holder 9 side and a claw 10 provided on the fixed side member 7 side, and
By rotating the holder 9 and moving it in the direction of the wire path C, the engagement claw 11 is brought into the upper or lower position of the claw 10, and the holder 9 is moved to the holder position as shown in FIG. 3(A). The tip of the nozzle 9 (nozzle hole 8) can move between a processing position close to the surface of the workpiece 1 and a distant wiring position as shown in FIG.

The distance a at the processing position is approximately 0.2 mm as described above, and the distance d at the connection position is increased to approximately 9 mm, which is convenient for both processing and connection operations.

In addition, at the machining position, a machining fluid passage e is secured between the holder 9 and the stationary member 7 as shown in FIG. The passage e is blocked and machining fluid is not supplied.

In the conventional structure described above, the processing of the positioning means between the holder 9 and the fixed side member 7 is expensive, and the holder 9 has to be disengaged from the engaging claw 11 and the engaging power receiving tab claw 10.
It is necessary to rotate the holder 9 after the wire connection is completed, and machining is started with the holder 9 still in the wire connection position, resulting in problems such as burnout of the wire because the machining fluid is not sprayed.

Problems to be Solved by the Invention The present invention can be manufactured at low cost, and also makes it easier to connect by separating the holder from the surface of the workpiece during wiring.
The objective of the present invention was to provide a nozzle structure for a wire electric discharge machine, in which a holder equipped with a nozzle hole automatically moves to the machining position when machining starts.

Means for Solving the Problem The nozzle section in the guide section of a wire electrical discharge machine is constructed as follows; A stationary side member is fixed to the machine frame of the guide section.

A cylindrical holder with a nozzle hole at its tip was fitted to the stationary member, so that m11 could be moved freely along the wire path C.

A frictional engagement member that can support the weight of the holder and is moved by the machining fluid pressure is interposed on the sliding contact surface between the stationary side member and the holder.

Function: The friction engagement member provided on the sliding surface of the holder and the stationary side member holds the holder at any position in the direction of the wire path a with respect to the stationary side member. allow to move to.

Embodiment FIG. 1 shows a nozzle section 5, and the machine frame 6 is not particularly different from the conventional one, so its explanation will be omitted.

In the nozzle part 5, a fixed side member 7 is composed of a pedestal 12, a die supporter 13, and a die guide 14;
A nozzle member 16 is provided at the tip.

Note that the structure of the nozzle portion 5 is the same for the upper guide portion 2 and the lower guide portion 3, so the explanation will be made without distinguishing between the upper and lower nozzle portions 5.

The pedestal 12 has a flat-bottomed recess 17 with a diameter slightly larger than the outer diameter of the holder 9 on its surface side, and a through hole 18 is formed in the center thereof. Reference numeral 19 is a cover member that closes the outer periphery of the gap created between the boulder 9 and the recess 17.

A die guide 14 is fixed to the tip side of the die supporter 13 by screws 20, and a wire passage 21 is attached to these.
is provided through the wire along the wire path C. As shown in FIG. 5, the base side 22 of the die supporter 13 is formed with a small diameter and has an annular engaging portion 23 formed therein, and a protrusion 24 is formed on the end surface of the base side 22 along the wire path C direction. There is.

The die supporter 13 extends the protrusion 2 into the through hole 18 of the pedestal 12.
4 and are fixed to the base 12 with screws (not visible in the figure). Note that a machining fluid flow path 25 passes through the seven ring portions of the pedestal 12, the die supporter 13, and the die guide 14, and communicates with the inside of the holder 9.

The holder 9 is cylindrical and has an engagement ring 15 and a screw 26 on the base side.
, and a nozzle member 16 made of acrylic resin is screwed onto the distal end side to form a nozzle hole 8 .

The engagement ring 15 has an inner diameter that fits into the base side 22 of the die reporter 13, and forms a sliding surface with the die supporter 13 as a part of the holder 9. Engagement ring 15
A groove is formed on the inner circumferential surface, and an O-ring 27 made of synthetic rubber is mounted thereon as a friction engagement member.

The degree of frictional engagement by the O-ring 27 is determined by the engagement ring 15,
It can hold the weight of the holder 9 including the nozzle member 16,
On the other hand, the holder 9 is only moved by the pressure of the machining fluid that fills the inside of the holder 9 during machining (usually about 15 kG/cd).

Therefore, if the wire electrical discharge machine is currently machining,
In FIG. 1, since the machining fluid is supplied to the nozzle portion 5 from below through the machining fluid channel 25, the holder 9 has moved to the machining position on the tip side.

Since the machining fluid passage e is secured at this position, the machining fluid is jetted out from the nozzle hole 8 and is supplied to the position of electrical discharge machining of the workpiece and the wire.

When connecting, the machining fluid is stopped, the operator manually moves the holder 9 to the pedestal 12 side, and the engagement ring 15 of the holder 9
O-ring 2 interposed between the sliding contact surface of and die supporter 13
It is maintained in that position by the frictional engagement of 7. As a result, the tip of the die guide 14 protrudes a little beyond the nozzle hole 8, and the distance from the workpiece surface increases (0.2 mm → 9 mm).
mm).

Wire connection is performed in this state, and processing can be started or resumed immediately after the wire connection is completed. That is, the holder 9 that has been moved to the pedestal 12 side is automatically moved to the tip side by the pressure of the machining fluid without having to manually return the holder 9 to the tip side.

The above is an embodiment, and in the above, the frictional engagement member is not limited to a synthetic rubber O-ring, but may be a block or a metal ring having similar frictional engagement performance, and the nozzle member 16 is a holder. Sometimes it is formed integrally with 9.

The effect holder of the invention can be held at the wire connection position simply by operating it in the direction of the wire path C, and is easy to operate.

At the start of machining, the holder of the nozzle part is always at the application start position and sufficient machining fluid is supplied, which eliminates the accident of burning out the wire at the same time as machining starts.

An O-ring or the like can be used as the frictional engagement member, and the amount of engagement is much cheaper (manufactured) than the conventional structure of holder positioning means using a claw (on the die supporter side) and an engaging claw (on the holder side).

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view, Fig. 2 is a front view, Fig. 3 is a longitudinal sectional view of the conventional example, Fig. 4 is an exploded perspective view of the conventional example, and Fig. 5 is an exploded perspective view of the conventional example.
The figure is an exploded perspective view of the embodiment. 5... Nozzle part, 6... Machine frame, 7... Fixed side member, 9... Holder 12... Pedestal, 13... Dice reporter, 14... Dice guide, 15... - Engagement ring, 16... nozzle member, 27... 0 ring. -Yi. ○

Claims (2)

[Claims] (1) For the fixed side member fixed to the machine frame of the guide section,
A cylindrical holder with a nozzle hole at the tip is fitted so that it can slide freely along the wire path, and the sliding surface can support the holder's own weight, and the frictional engagement is such that it is moved by the machining fluid pressure. A nozzle structure of a wire electrical discharge machine characterized by having a member interposed therein. (2) The fixed side member consists of a pedestal fixed to the machine frame, a die supporter whose base is fixed to the pedestal, and a die guide attached to the tip side thereof, and the holder and die guide 2. The nozzle part structure according to claim 1, wherein the nozzle part structure is arranged so that the tip part of the die guide protrudes from the nozzle hole when the die guide moves toward the base side of the supporter.