JPH02180525A - Electric discharging device for wire cut - Google Patents

Abstract

PURPOSE:To drive a wire carry-out device still and inexpensively by driving the actuator of a wire carrying out device by the air pressure of the air bomb exchangeably arranged on a wire discharging device. CONSTITUTION:A solenoid air valve 46 is switched by operating a manual switch S and the rod of each air actuator 35, 37 is pulled in. Accordingly, the moving side belt part 17 of a wire carrying out device 8 is brought into contact with a fixed side belt part 16 by being moved upward. Then, a belt 19 is driven with the gear provided integrally with a support pulley being with the gear integral with a feed roller at the rear end side of the moving side belt part 17, and the belt 18 of the fixed side belt part is accordingly driven. Also, the support plate of the moving side belt part 17 is simultaneously moved a bit to the rear part, the rocking lever of the tip side is turned upward centering around the axial fulcrum to wind a belt 19 on a guide roller, the form receiving the tip of the winding wire becomes and is led to the feed roller automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a wire-cut electrical discharge machining apparatus equipped with a belt-type wire delivery device.

In conventional wire-cut electrical discharge machining equipment, when several independent cutting operations are performed from the same workpiece, after one cutting operation is completed, the wire is cut, and then the upper part of the supply side) is cut. It is necessary to pull out the wire from the wire guide, pass the tip of the wire through the initial hole of the workpiece for the next cutting process, pass through the lower wire guide, and finally reach the feed roller.

Furthermore, similar operations are required when the wire is disconnected during processing and reconnected.

In this case, the wire tip can be passed relatively easily to the lower wire guide, but the wire path from the lower wire guide to the feed roller is usually bent at almost a right angle from the previous path. It becomes difficult to feed the wire. For this reason, a belt-type wire carrying device is provided between the bending portion below the lower wire guide and the feed roller.

The wire unloading device is arranged on the lower arm and includes a fixed side belt part and a moving side belt part. The moving side belt part is controlled by an actuator such as a solenoid or an air cylinder in parallel to the fixed side belt part in the contact direction and the separation direction. The structure is being moved to The actuator is driven by a command from the control device of the wire-cut electric discharge machining device or by a manual switch that is operated when necessary, and the movable side belt portion presses against the stationary side belt portion to sandwich the wire and carry it out to the feed roller. It is supposed to be done.

In this case, the air actuator is preferable to the solenoid because it can exert sufficient force to move the moving belt portion and press against the stationary belt portion, and is resistant to water, and is therefore often used.

However, apart from large factories that have access to an in-house air pressure source, small factories require compressors to provide air pressure, even if only for the air actuators that drive the wire conveying equipment. Compressors are expensive, so going out of your way to purchase them tends to be disadvantageous in terms of production costs.Also, the operating noise is annoying, and if you run a wire-cut electrical discharge machine like this all night in a small factory in town. The above-mentioned operating noise may cause noise in the neighborhood and cause a big problem.

Problems to be Solved by the Invention An object of the present invention is to provide a wire-cut electrical discharge machining device that can quietly and inexpensively drive a wire unloading device equipped with an air actuator.

Means for Solving the Problems The air actuator of the wire carry-out device is driven by air pressure from an air cylinder replaceably provided in the wire electrical discharge machining device.

Function: The air cylinder eliminates the need for a drive source for air pressure and silently drives the wire unloading device.

Embodiment FIG. 2 schematically shows the entire wire-cut electric discharge machining apparatus @1.

A column 3 stands up from a base 2, a horizontal part 4 is above the column 3, and a lower arm 5 extends above the base 2 from the bottom. An upper wire guide 6 is attached to the tip of the horizontal portion 4, and a lower wire guide 7 is attached to the tip of the lower arm 5.

Inside the lower arm 5, a wire delivery device 8 is arranged between the lower part of the lower wire guide 7 and a feed roller 9 provided on the column 3.

The feed roller 9 is equipped with a gear (not shown) that meshes with a gear provided integrally with a support pulley 28, which will be described later, and on this day -59, a pinch roller 10 is pressed against it.

A wire supply reel 1 is installed in the column 3 and the horizontal section 4.
1 and a tension row 512 are provided. Sign @13
14 is a workpiece, and 14 is a guide roller.

The wire 15 passes from the supply reel 11, passes through the tension row 512, the upper wire guide 6, the work 13, and the lower guide 7, is bent at the guide roller 14, passes through the wire delivery device 8, and reaches the feed roller 9. .

The wire delivery device 8 includes an upper stationary side belt section 16 and a moving side belt section 17 disposed opposite thereto, and the belts 18 and 19 of both belt sections 16 and 17 face each other in the longitudinal direction of the lower arm 6. Rotate to.

The fixed side belt portion 16 is attached to the support plate 2 as shown in FIG.
Support pulleys 21, 22 and an intermediate support row 52 are provided at both ends of the
3 (plurality), and a belt 18 is wound around them. The belt 18 is tensioned by a tension pulley 24 provided on the lower arm 5 side during coasting.

The support plate 20 of the stationary belt section 16 is fixed relative to the lower arm 5, so that this belt section 16 is always in a fixed position.

The movement side belt portion 17 includes a support plate 25.25' (back side) and a swinging rod 26, one support pulley 27 is attached to the tip of the swinging rod 26, and one support pulley 27 is attached to the rear end of the support plate 25.25'. A belt 19 is hooked and rotated between the other support pulley 28.

Note that the support pulley 28 is provided with a gear (not shown) that meshes with a gear integrated with the feed roller 9 when the support pulley 28 approaches.

In the middle of the support plate 25, 25', as in the case of the fixed belt portion 6, a plurality of support rollers 29 are arranged (FIG. 4) to support the belt 19 inside. The belt 19 is constantly tensioned by a tension pulley 30 provided on the support plate 25, 25' side.

The support pulley 27 on the leading end side is located below the front of the guide roller 14 , and the support pulley 28 on the rear end side is located below and behind the feed roller 9 .

As shown in the figure, the swinging rod 26 has its rear end pivoted 31 on the lower arm 5, and its middle pivoted on the support plate 25.25'. ) When moved, the tip swings up and down.

The movement side belt portion 17 is supported by the lower arm 5 by a plurality of parallel links 33 having one end attached to the support plate 25 and a narrow end attached to the lower arm 5 side.

Among these links, the tip link 33a has a lever 34 formed upward from the intermediate portion, and a rod 36 of an air actuator 35 is connected to the tip of the lever 34.

Further, the link 33b at the rear end extends downward, and a rod 38 of another air actuator 37 is connected to the tip thereof. Reference numerals 39.40 and 41.42 are ports for air supply and exhaust of the air actuator 35.37.

Air actuator 35.37 has a set pressure of 3 Kg/
It is a double-acting type with a stroke of 15 mm, and the air ω required for one operation is small, 15 cc.

That is, the movable side belt portion 17 is connected to the fixed side belt portion 16 by the link 33 and the air actuator 35,37.
It moves parallel to the object, approaches and moves away from it.

As shown in FIG. 1, the air actuators 35 and 37 include an air cylinder 43, a pressure switch 44, and a regulator 45.
, are connected via an electromagnetic air valve 46.

The air cylinder 43 has a pressure of 200 atm (199 Kg/cm),
It has a capacity 101 and is replaceably installed in the wire-cut electrical discharge machining apparatus 1 .

The pressure switch 44 sets the pressure inside the air cylinder to 3K.
It is set to activate when the temperature drops below 9/crA.

The regulator 45 is for setting the working pressure.
Kg/cm ItC is set.

The electromagnetic air valve 46 includes a port 47 connected to the air supply/exhaust port 39.41 of the air actuator 35.37, a port 48 connected to the air supply/exhaust port 40.42, and a silencer 49, and is electromagnetically driven to operate both the boats 47.
48 is alternately switched to the air cylinder 43 side and the Xilencer 49 side.

Reference numeral R denotes a relay device, which drives an alarm A when the pressure switch 44 is activated, and activates the electromagnetic air valve 46 when the manual switch S is operated, to each air actuator 3.
At 5.37, switch to retract rod 36.38.

When finishing one cutting process on the workpiece 13 and connecting the wire through a new initial hole, first, the tip of the wire 15 pulled out from the upper wire guide 6 is passed through the initial hole and the lower wire guide 7. Reach the bend below the guide.

The manual switch S is operated to switch the electromagnetic air valve 46, and the rods of each air actuator 35, 37 are retracted.

As a result, the movement side belt portion 17 of the wire delivery device 8
moves upward and contacts the stationary side belt portion 16. Then, the support pulley 28 is
The aforementioned gear provided integrally with the feed roller 9 meshes with the gear integral with the feed roller 9 to drive one belt, and the belt 18 of the stationary side belt portion is driven accordingly.

At the same time, the support plate 25 of the moving belt portion 17 also moves slightly backward, rotates the swinging rod 26 on the tip side upward about the pivot point 31, and wraps the belt 19 around the guide roller 14. , the tip of the inserted wire 15 is received at that part.

Therefore, the tip of the wire 15 inserted to the bottom of the lower wire guide 7 is then sandwiched between the stationary side belt portion 16 and the moving side belt portion 17 and automatically guided to the feed roller 9 to complete the wire connection. .

After the wiring is completed, by releasing the manual switch S, the electromagnetic air valve 46 returns to its original position, causing each actuator 35, 37 to move back.

The air on the exhaust side is discharged to the outside via the XI sensor 49.

Normally, wire connection operations are performed about 5 to 10 times a day, but the air consumption per operation of the air actuator is small, so the capacity of the air cylinder 43 for this purpose is 101.
Even though it is small, it can be used for a long time.

When the air pressure in the air cylinder 43 becomes insufficient, an alarm is generated to notify that it is time to replace the air cylinder.

Air can be filled at low cost.

Although the embodiments have been described above, the air actuator 3
5.37 and the movement mechanism of the moving belt portion 16.17 driven thereby are not limited to those shown. Further, there is a case where the number of air actuators is one.

Effect of the invention The wire unloading device can be driven quietly.

No need for expensive air conditioner blazer.

The air actuator provides sufficient power for driving the kinematic belt.

Wire connection requires less effort and can be completed easily.

[Brief explanation of the drawing]

FIG. 1 is a mechanical diagram, FIG. 2 is a front view, FIG. 3 is a front view of the main parts, and FIG. 4 is a top view of the roller portion. 6... Upper wire guide, 7... Lower wire guide, 8... Wire carry-out device, 9... Feed roller, 14... Guide roller, 15... Wire, 16
...Fixed side belt part, 17...Movement side belt part, 18.19-...Belt, 33 (33a, 33b)
- Link, 34... Link, 35.37... Air actuator, 43... Air cylinder, 44... Pressure switch, 45... Regulator, 46... Electromagnetic air valve.

Claims (1)

[Claims] A wire delivery device is provided, which is located between the bending part and the feed roller below the lower wire guide, and includes a stationary side belt part and a moving side belt part that is driven in parallel to the fixed side belt part in contact and separation directions by an air actuator. ,
A wire-cut electrical discharge machining apparatus characterized in that the air actuator is driven by air pressure from an air cylinder that is replaceably provided.