JPH0767651B2 - Cutting work removal device - Google Patents

Description

Description: [Industrial application] The present invention relates to a cut-out workpiece take-out device in a wire-cut electric discharge machine.

[Prior Art] Conventionally, a cut-out work is taken out by an electric discharge machine by the following method.

FIG. 12 is a schematic view showing a conventional method for taking out a cut-out work. In the figure, (1) is an upper head for wire cutting, (2) is a lower head, (3) is a processing tank, and (4).
Is a work fixing base, (5) is a work main body, (6) is a cut-out work, (7) is a magnet, (8) is a handle of a magnet, (71) is a work main body, a fixing metal to (5), (72) ) Is a fixing screw.

Next, the operation will be described with reference to the drawings. A wire (not shown) was passed between the center of the upper head (1) and the center of the lower head (2), and a voltage was applied between the wire and the work body (5) to perform electric discharge machining. After that, the wire is cut by a wire cutting device (not shown). After that, the upper head (1) rises and stops near the stroke end, and the completion of processing is transmitted to the operator. At this time, the cut-out work (6) is held by the lower head (2) as shown in the figure. After that, the magnet (7) is attracted to the upper surface of the cut work (6) as shown in the figure, and the cut work (6) is taken out by lifting the handle (8) by the hand (9) of the worker.

Generally, die-cut work materials that are machined with a wire-cut electric discharge machine include alloy tool steel and cemented carbide.
Since all of them are magnetic materials in which an attractive force is generated by the magnet, the cut-out work (6) is usually taken out by using the magnet.

[Problems to be Solved by the Invention] As described above, the conventional method for taking out the cut-out work requires a step of taking out the cut-out work (6) manually by the operator after the wire cutting process is completed. This is not only inefficient, but also a major obstacle to promoting automation through continuous unmanned operation.

The present invention has been made to solve such a problem, and even if there are many parts to be processed by one work body,
It is an object of the present invention to obtain a cut-out work take-out device that can take out a cut-out work automatically with simple control without requiring human power.

[Means for Solving the Problems] A cut-out work take-out device according to the present invention is a cut-out work for a wire-cut electric discharge machine for cutting a work into a predetermined shape by installing a wire electrode between an upper head and a lower head. A take-out device, a main body part that is installed at a fixed horizontal position with respect to the upper head, an arm attached to the main body part so as to be horizontally swingable so as to face the work, and the arm. Positioning that defines a drive means for swinging, two positions of the arm in the horizontal retracted position and a workpiece suction position, and controls the drive means so that the arm reciprocally swings between the two positions. A control means, a lifting means for moving the arm up and down, and an arm tip attached to the work-opposing surface of the arm tip, and when the arm reaches the work suction position, the arm is moved to the lower position of the upper head. It is provided with a base plate arranged so as to be bent and a magnetic attraction means attached to the base plate.

[Operation] In the cut-out work take-out device configured as described above, each time the work is cut out, the positioning control means drives the arm from the retracted position to the work suction position. When the arm reaches the workpiece suction position, the raising and lowering means lowers the arm, and the magnetic attraction means sucks and takes out the cut work.

[Embodiment] FIG. 1 is a side view schematically showing an embodiment of the present invention, and FIG.
The figure is a plan view thereof, and FIG. 3 is a sectional view of the arm portion.

In the figure, (11) is a permanent magnet, (12) is an iron plate, (13)
Is a holder, (14) is a base plate, (16) is an arm, (1
5) and (17) are screws, (18) is a block, (20) is a shaft,
(21) bearing, (22) shaft C retaining ring, (23) spline shaft, (24) nut, (25) key, (26) set screw, (27) cylinder, (28) Is the body, (19),
(29) is a screw, (30) is a connecting rod, and (31) is a connecting plate.

Holder (13) holding the permanent magnet (11) and iron plate (12)
Is fixed to the base plate (14) with screws (15) to form magnetic attraction means.

The base plate (14) is fixed to the arm (16) with a screw (17) so as to be rotatable, and the block (18) is fixed to the swing arm (16) with a screw (19) as shown in FIG. As shown in FIG. 3, the block (18) includes a shaft (20), both ends of the shaft (20) are supported by bearings (21), and the bearing (21) and the shaft (20) are 18) Axis C retaining ring (2
Fixed by 2).

Next, details of the magnetic attraction means, the arm lifting means, and the turning means will be described.

4 is a detailed view of the magnet holder, FIG. 5 is a side view of the magnet holder portion, and FIG. 6 is a bottom view of FIG.

First, the holder (13) is made of a non-magnetic material, and as shown in FIG. 4, a plate-shaped permanent magnet (11) and a plate-shaped iron plate (12) are alternately arranged on the lower surface of the holder (13). 12) is protruded from the permanent magnet (11), and a magnet block in which the permanent magnets (11) are laminated in such a manner that their magnetic poles are reversed every other method is mounted, and further, FIG. 5 and FIG. As shown in Fig. 1, by appropriately arranging a number of holders (13) on the lower surface of the base plate (14) with screws (15), the base plate (1
A magnetic surface adapted to the shape of the cut-out work (6) is formed on the lower surface of 4) so that a magnetic hand for adsorbing the cut-out work (6) can be formed.

Next, the spline shaft (23) is inserted into the center of rotation of the swivel arm (16) and held by the nut (24). In the fitting part between the spline shaft (23) and the swivel arm (16),
The key (25) is fixed by a set screw (26), by which the rotational force of the spline shaft (23) is transmitted. A shaft having a circular cross section may be used instead of the spline shaft (23).

(27) is a cylinder for moving up and down the swivel arm (16), which is fixed to the main body (28) with a screw (29), and the rod of the cylinder (27) is screwed to a connecting rod (30).
Locked with the nut (31). The lower end of the connecting rod (30) is fixed to the connecting plate (33) by a screw shaft (32), and the connecting plate (33) is a shaft collar of the spline shaft (23) via a bearing metal (34) through a bearing metal (34). 37) is fitted and supported. The connecting plate (33) further has bearing metal (3
5) and (36), so that the spline shaft (23) and the swing arm (16) are rotatable with respect to the connecting plate (33).

(41) is a motor for turning the turning arm (16),
The small gear (43) is fixed to the main body (28) with a screw (42), and the output shaft end of the motor (41) is attached with a screw (45) via a collar (44). 43) meshes with a large gear (47) fixed to a bearing (48) of the spline shaft (23) by a key (49). (46) is a set screw.

Furthermore, the upper and lower parts of the large gear (47) are the bearing metal (50),
It is supported by (51) and the bearing metal (51) is fixed to the main body (28) by screws (52) to support the whole.

FIG. 7 shows a plan view of the turning limit switch section. In the figure, (53) is a dog, (54) is a limit switch,
(55) is a screw.

As shown in FIG. 7, a dog (53) is screwed to the outer peripheral portion of the large gear (47), while the main body (28) is fastened.
A limit switch (54) is fixed to the screw by a screw (55) to control the swing range of the swing arm (16).

FIG. 8 and FIG. 9 are explanatory views of the operation of taking out and removing the cut-out work. The operation of the present invention will be described with reference to the drawings.

In the figure, (61a) is the work stock box, (61b) is (61
The flat part of a), (71) is a fixed metal, and (72) is a screw.

As shown in FIG. 8, after the electric discharge machining of the work is completed by the wire electric discharge machine and the wire is removed, the upper head (1) moves to the vicinity of the rising end and stops. When the upper head (1) has finished moving, the motor (41) is driven as shown in FIG. 1, thereby transmitting the rotational power from the small gear (43) to the large gear (47), and this rotation is performed by the key. (49)
Through spline bearing (48) to spline shaft (23)
To the swivel arm (16) through the key (25) at the lower end of the spline shaft (23). This turning position is detected when the dogs (53a) and (53b) screwed to the large gear (47) come into contact with the limit switches (54a) and (54b) as shown in FIG. (16) can always be stopped at a fixed position. As a result, the center position of the base plate (14) attached to the tip of the revolving arm (16) can always be aligned with the center lines of the upper head (1) and the lower head (2) and can be stopped. At this time, the cut-out work (6)
Is supported by the upper surface of the lower head (2) and is embedded in the work body (5).

Next, when a high pressure error is sent to the cylinder (27) and a rod (not shown) is moved forward, the swing arm (16) is gradually lowered while holding the holder (13) by the base plate (14). The bottom surface of the holder (13) is a cutout work (6)
4, the strong magnetic lines (81) are evenly generated on the lower surface of the iron plate (12) of the magnet block to generate a strong magnetic force, and the cut work (6) is attracted.

Next, when the rod of the cylinder (27) is retracted and the revolving arm (16) is raised, the cut-out work (8) is pulled out from the work (5) and rises as shown in FIG. 41) is driven to swivel the swivel arm (16) to move the cut work (6) onto the processing tank (3) as shown in FIG.

Generally, the machining tank (3) is NC driven for electric discharge machining of the work (5) into an arbitrary shape.

Further, as shown in FIG. 9, a work stock box (61a) for stocking cut-out works (6) is placed in the processing tank (3).
Is fixed, and a flat surface portion (61b) for supporting a bearing (21) provided in the block (18) is provided on the upper surface of the work stock box (61a).

Therefore, when the work stock tank (3) is moved, the work stock tank (3) is driven to move the work stock box (61a) installed therein directly below the swivel arm (16).

Then, the cylinder (27) is driven to lower the bearing (21) until it comes into contact with the flat surface portion (61b) of the work stock box (61a).

Next, when the descending tank (3) is moved in the direction of arrow A in FIG. 9, the cut-out work (6) hits the tip of the flat part (61b) and is pushed by this to push the permanent magnet (11) and the iron plate (12). When it reaches the surface of the holder (13) made of non-magnetic material by sliding sideways on the surface of (1), the magnetic force disappears, and it naturally falls and is stored in the work stock box (61a). Of course, the work stock box (61a) is made of a non-magnetic material. Swivel arm (16) after the cut-out work (6) has dropped
To return to the original standby position. In this way, all the machining of the work body (5) can be fully automated.

Although the shape of the cut-out work (6) is various, as described in FIG. 6, since there are many mounting holes for the base plate (14), the magnet blocks consisting of the holder (13) can be arranged arbitrarily. By fixing the cut work (6), the suction force can be concentrated according to the position of the center of gravity when sucking and lifting the cut work (6), so that the cut work (6) can be taken out in a well-balanced and safe manner.

It should be noted that the target work is often made of alloy tool steel, ultra-hard material, or high-hardness material, but as shown in FIG. 5, the magnet (11) of the holder (13) does not come into direct contact with them and the iron plate ( 12) are in contact with each other, so the magnet will not be damaged by the shock load during adsorption.

The case where the magnet (11) as the magnet attracting means is a permanent magnet has been described above. Next, the case where the magnet (11) is an electromagnet will be described.

FIG. 10 is a side view schematically showing the case where the magnet (11) is an electromagnet, and FIG. 11 is a bottom view.

In the figure, (62) is an iron core, (63) is a coil, (64) is an electric wire, (14) is a base plate, and (15) is a fixing screw. Next, the operation will be described. In the case of an electromagnet, an electromagnet consisting of an iron core (62), a coil (63), and an electric wire (64) is previously arranged and fixed on the lower surface of the base plate (14) as shown in FIG. When the cut-out work (6) processed in this way is pulled out, electricity is passed through the electric wire (64) only to the coil (63) of the electromagnet with which the cut-out work (6) comes into contact, and a magnetic force is generated in the iron core (62). If this is done, the cut-out work (6) is adsorbed and the other parts have no magnetic force, so the cut-out work (6) can be easily pulled out.

That is, in the case of a permanent magnet, the permanent magnet holder (13) is previously prepared according to the shape of the cut-out work (6) to be pulled out.
It is necessary to arrange the magnets and remove the unnecessary magnet holder (13), but in the case of electromagnets, the magnetic hand can be easily formed according to the shape of the cut-out work (6) by controlling the energizing range. It can be adsorbed and taken out.

Next, when the cut-out work (6) is to be housed in the work-stock box (61a), the cut-out work can be performed by stopping the electric current of the electromagnet when the cut-out work (6) is located on the work-stock box (61a). Since (6) falls freely and is housed in the work stock box (61a), it can be automatically stored.

[Effects of the Invention] As described above, in the present invention, each time a work is cut out, the arm is moved from the retracted position to the work suction position, and the arm is lowered to suck the cut work by the magnetic attraction means. Since the work piece is taken out, even if there are many parts to be processed by one work body, human power is not required and the cut work piece can be taken out automatically by simple control. In addition, by making it possible to automatically take out the cut-out work, not only the efficiency of wire-cut processing is significantly improved compared with the past, but it is also possible to achieve complete automation by continuous unmanned operation, which improves productivity. A dramatic effect can be achieved for improvement.

[Brief description of drawings]

FIG. 1 is a side view schematically showing an embodiment of the present invention, and FIG.
The drawing is its plan view, FIG. 3 is a cross-sectional view of the arm portion, FIG. 4 is a detailed view of the magnet holder, FIG. 5 is a side view of the magnet holder portion, and FIG. 6 is a bottom view of FIG. Fig. 8 is a plan view of the swing limit switch, Fig. 8 is an explanatory view of the cut-out work taking-out operation, and Fig. 9 is an explanatory view of the cut-out work removing operation.
10 is a side view of another embodiment, FIG. 11 is a bottom view of FIG. 10,
FIG. 12 is a schematic explanatory view of a conventional example. In the figure, (1) is an upper head, (2) is an upper head, (3) is a processing tank, (4) is a work fixing base, (5) is a work body, (6) is a cut-out work, and (11) is Magnet, (1
2) is an iron plate, (13) is a holder, (14) is a base plate, (1
6) arm, (20) shaft, (21) bearing, (23) spline shaft, (27) cylinder, (30) connecting rod, (3)
3) is a connecting plate, (41) is a motor, and (54) is a limit switch. In each drawing, the same reference numerals indicate the same or corresponding parts.

Claims (4)

[Claims] 1. A cut-out work take-out device of a wire cut electric discharge machine for cutting a work into a predetermined shape by arranging a wire electrode between an upper head and a lower head, which is horizontal to the upper head. A main body part whose position is fixed, an arm attached to the main body part so as to be horizontally swingable so as to face the work, a drive means for swinging the arm, and a horizontal retracted position of the arm. Positioning control means that defines two positions, a work suction position, and controls the drive means so that the arm reciprocally swings between the two positions; an elevating means that elevates and lowers the arm; A base plate attached to the work-opposing surface of the tip end portion so as to come to a position below the upper head when the arm reaches the work suction position; and a base plate attached to the base plate. And a magnetic attraction means provided therein. 2. The magnetic attraction means alternately combines a plurality of permanent magnets and magnetic metal, and arranges the permanent magnets with their magnetic poles reversed every other direction to form a laminate. The cut-out work take-out device according to claim 1, characterized in that the outer surface other than the surface is surrounded by a non-magnetic material. 3. The cut-out work take-out device according to claim 1, wherein the base plate is capable of arbitrarily setting a mounting position of the magnetic attraction means in accordance with the shape of the cut-out work. 4. The cut-out work take-out device according to claim 1, wherein the magnetic attraction means is composed of a plurality of electromagnets, and any electromagnet can be energized according to the shape of the cut-out work.