JPH03208555A - Circulating feeding device of grinding liquid of wire saw - Google Patents

Abstract

PURPOSE:To feed a grindliquid to the lower face of a wire, by providing a nozzle which feeds the grindliquid to the lower face of a wire with its overflowing from the upper slit in an oblong hole shape to the lower part approaching position of a travelling wire at the outside of a multigrooved roller group and feeding the grindiquid by the grindiquid feeding pump of a grindliquid tank to this nozzle. CONSTITUTION:When the grindliquid of a grindiquid tank 11 inside is fed to a nozzle 6 by a grindliquid feeding pump 14, the grindiquid is overflowed from an oblong hole shaped slit 7, a travelling wire 1 is passed through in the state of being dipped in a line like grindliquid partially and the grindiquid is surely fed to the lower face thereof. So, abrasive grains can be pulled sufficiently into the space between the wire 1 lower face and a work 2, and the working accuracy and productivity can be improved by increasing the lapping efficiency. Also, one part of the grindliquid discharged from the grindliquid feeding pump 14 is injected in the inner wall circumferential direction of the grindliquid tank 11 by a grindliquid stirring nozzle 19 to cause a spiral movement of abrasive grain inside the tank. Accordingly the abrasive grain performs a self stirring and does not settle.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an abrasive liquid circulation supply device for a wire saw that cuts a workpiece using a running wire.

<Conventional technology> A wire saw wraps wires in parallel in multiple layers around the outside of a group of multi-groove rollers, and rotates the multi-groove rollers in forward and reverse directions to move the wire back and forth between the multi-groove rollers. The workpiece is cut with a moving wire, and cutting is performed by lapping while an abrasive liquid is interposed between the workpiece and the wire.

In order to obtain effective cutting with a wire saw as described above, in addition to making maximum use of the allowable additional tension of the wire, as shown in FIG. It is necessary to ensure that the abrasive grains 3 are interposed between the workpiece 2 and the workpiece 2.

Further, since the abrasive liquid is a mixture of the lapping liquid and the abrasive liquid, it is necessary to take measures against sedimentation of the abrasive liquid in the apparatus for supplying the abrasive liquid to the wire.

In conventional wire saws, abrasive liquid is supplied to the wire at the top of the slicing space inside the multi-groove roller group.
A nozzle having a porous or elongated slit is disposed facing downward, and the abrasive liquid is dripped or sprayed from the nozzle and supplied onto the wire moving to the slicing section.

In addition to the device using the above-mentioned nozzle, there is also an abrasive
In order to improve feeding efficiency at night, a dipping method has also been proposed in which the workpiece to be sliced and the wire are immersed in abrasive liquid.

Furthermore, the conventional abrasive liquid supply device that supplies abrasive liquid to the nozzle has a structure in which an abrasive liquid supply pump device and an abrasive liquid stirring device to prevent abrasive grain sedimentation are installed separately on a cylindrical flat-bottomed abrasive tank. It has become.

<Problems to be Solved by the Invention> By the way, in the conventional nozzle structure for supplying abrasive liquid to the wire, the nozzle is located inside the multi-groove roller group.
Due to the upward movement of the workpiece, it is difficult to place it in a position where the abrasive liquid can be efficiently supplied, and it is inevitably necessary to mount the workpiece at the upper part, which is a dead space in the slicing processing space, where the supply efficiency is poor and the workpiece is far away from the running wire.

For this reason, the abrasive liquid falls onto the top surface of the wire in spots due to viscosity, surface tension, etc., making it impossible to uniformly supply the abrasive liquid to the entire wire hanging width, and it tends to be localized.
There is a problem in that the drop impact caused by the drop causes vibrations to the wire, causing uneven wrapping efficiency and reducing processing accuracy and productivity.

In addition, since the abrasive liquid is supplied from the top to the top of the wire,
Coupled with the fact that the wire itself is running at high speed, the abrasive liquid reaches the slicing section before it reaches the bottom surface of the wire, and is repeatedly supplied unnecessarily to the grooves of the already sliced workpiece. It turns out.

In particular, as the slicing thickness becomes thinner and the wire pitch becomes finer, it becomes increasingly difficult to reliably supply the abrasive liquid to the lower surface of the wire due to the viscosity, surface tension, etc. of the abrasive liquid.

Furthermore, if coarse foreign matter, broken pieces of the workpiece, etc. get mixed into the abrasive liquid and are supplied to the nozzle, supplying the abrasive liquid from inside the multi-groove roller group will immediately prevent the foreign matter from being bitten into the V-groove portion of the multi-groove roller. Unavoidably, this leads to an increase in the number of broken pieces of workpieces due to wire derailment, frequent occurrence of defective products, and damage to the multi-groove roller, which in turn leads to a vicious cycle of wire breakage accidents and the need to discard and replace the abrasive liquid.

Next, the dipping method, in which the workpiece and wire are immersed in the abrasive liquid, requires complicated sealing of the abrasive liquid and countermeasures against sedimentation, poor workability such as winding the wire and attaching the workpiece, and the multi-groove roller due to the dipping tank. There is a problem in that an increase in the distance between the axes causes a decrease in the rigidity of the wire.

Furthermore, sealing of the abrasive liquid tends to make the relative temperature difference between the immersed workpiece and the multi-groove roller more pronounced, and there is a problem that the change in the wire spacing causes a decrease in processing accuracy.

Furthermore, in conventional abrasive liquid supply devices, the abrasive liquid supply pump and abrasive liquid agitation device are installed separately on the abrasive liquid tank, resulting in a complex overall structure and the need to make the abrasive liquid tank more compact due to the installation of both devices. Moreover, since the bottom of the tank is flat, there is a problem that abrasive grains with heavy specific gravity tend to settle at the bottom of the outer periphery of the tank.

In addition, in conventional abrasive liquid supply devices, there is a simple abrasive liquid agitation device that uses an air jet agitation method from the bottom of the tank.
Even if this method is adopted, sufficient abrasive liquid agitation cannot be expected, and abrasive grains will inevitably settle around the inside of the tank. Especially when using oil-based or water-soluble lapping liquid with low viscosity, abrasive grains will settle. is even more remarkable.

Therefore, in order to solve the above-mentioned problems, the object of this invention is to uniformly supply the abrasive liquid to the lower surface of the entire width of the wire, thereby averaging out the lapping effect and improving machining accuracy and productivity. In addition, it is possible to prevent multi-groove roller damage and wire derailment accidents, and to even out the relative temperature difference between the multi-groove roller and the workpiece.It is also small and has an excellent abrasive liquid stirring effect. Another object of the present invention is to provide an abrasive liquid circulation supply device for a wire saw that can prevent precipitation of abrasive grains.

<Means for Solving the Problems> In order to solve the above-mentioned problems, the first invention provides a method in which abrasive liquid overflows from an elongated upper slit at a lower approach position of the running wire outside the multi-groove roller group. A nozzle is provided on the lower surface of the wire, and the abrasive liquid is supplied to this nozzle by an abrasive liquid supply pump in an abrasive liquid tank.

In the second invention, an abrasive liquid supply pump is housed inside an abrasive liquid tank, and a part of the abrasive liquid tank, which is a part of the abrasive liquid, is connected to an abrasive liquid supply path that connects a discharge port of this abrasive liquid supply pump and a nozzle. It has a branched configuration with an abrasive stirring nozzle that sprays the abrasive liquid in the circumferential direction of the inner wall.

In a third aspect of the present invention, the abrasive liquid tank is formed in the shape of a mortar with a cylindrical upper part and a conical lower part.

When the abrasive liquid in the abrasive liquid tank is supplied to the nozzle with the abrasive liquid supply pump, the abrasive liquid overflows from the long hole-shaped slit, and the running wire is partially immersed in the line-shaped abrasive liquid. pass through,
Since the abrasive liquid is reliably supplied to the lower surface of the wire, it is possible to sufficiently draw the abrasive grains between the lower surface of the wire and the workpiece, increasing rubbing efficiency and improving machining accuracy and productivity. .

In addition, a part of the abrasive liquid discharged from the abrasive liquid supply pump is sprayed in the circumferential direction of the inner wall of the abrasive liquid tank by an abrasive liquid stirring nozzle, causing a swirling motion in the abrasive liquid in the tank, and self-stirring causes the abrasive grains to settle. Reliably prevent occurrence.

<Example> Hereinafter, an example of the present invention will be described based on the accompanying drawings.

As shown in FIGS. 1 and 3, the wire saw has wires 1 wound in parallel in multiple layers around the outside of multi-groove rollers 4 and 4 arranged on both sides, and a work piece 2 placed between both multi-groove rollers 4 and 4. A work table 5 supporting the is disposed so as to be movable up and down, and the wire 1 is reciprocated between the multi-groove rollers 4 and 4 by reciprocating the multi-groove rollers 4 and 4, and the work 2 is raised by the work table 5. Meanwhile, the wire 1 moving in the lower part between the multi-groove rollers 4 is used to cut the wire.

In the wire saw, nozzles 6 and 6 for supplying abrasive liquid are arranged on both sides of the workpiece 2 at a position close to the lower running portion of the wire 1 outside the multi-groove rollers 4 and 4.

The nozzles 6, 6 are long in the parallel direction of the wires 1, and are provided with long hole-shaped slits 7 in the longitudinal direction of their upper portions, so that abrasive liquid supplied from an abrasive liquid supply pump, which will be described later, overflows in a line from the slits 7. The abrasive liquid is uniformly supplied to the entire lower surface of the running wire 1 within the width of the wire.

In this way, when the nozzles 6, 6 are brought very close to the lower surface of the lower running wire 1 and the abrasive liquid overflows from the slit 7, the wire 1 passes through the line-shaped abrasive liquid in a submerged state, The abrasive particles can be supplied to the lower surface of the wire 1, and as shown in FIG. 2, the abrasive particles are sufficiently drawn into the space between the lower surface of the wire 1 and the workpiece 2 due to the viscosity of the abrasive liquid and the high-speed running of the wire 1. This makes it possible to improve wrapping efficiency.

Further, even if the slicing thickness becomes thinner and the pitch of the wire 1 becomes finer, there is no problem in supplying the abrasive liquid, and on the contrary, the supply efficiency improves due to the viscosity and surface tension of the abrasive liquid.

The abrasive liquid tank 11 that stores the abrasive liquid to be supplied to the nozzles 6, 6 has a double wall structure consisting of an inner tank l2 and an outer tank l3.The inner tank l2 is for storing the abrasive liquid, and the abrasive liquid is stored inside. A liquid supply pump 14 is housed, and a motor 16 for driving the pump 14 is installed on the upper lid 15. The outer tank 13 is for adjusting the temperature of the abrasive liquid and is a circulation tank for cooling water or hot water.

The inner tank 12 is shaped like a mortar with a cylindrical upper part and a conical lower part, centered around the impeller casing part of the pump 14.
It has a structure that eliminates dead spots for sedimentation and prevents abrasive grains with heavy specific gravity from settling at the bottom of the outer periphery.

In addition, an automatic temperature adjustment device W17 for the abrasive liquid is installed in the outer tank l3.
is connected.

The motor 16 that drives the abrasive liquid supply pump 14 can have variable rotation speed using an inverter or the like, and can adjust the pump discharge amount in response to changes in the viscosity of the abrasive liquid and only stir the abrasive liquid when the machine is stopped. can be adjusted to the minimum necessary discharge amount.

The discharge port of the abrasive liquid supply pump 14 and the nozzles 6, 6 are connected by an abrasive liquid supply path 18, and this abrasive liquid supply path 1
8 is an abrasive liquid agitation nozzle that sprays a portion of the abrasive liquid in the circumferential direction of the inner wall of the inner tank 12 to cause the abrasive liquid in the inner tank 12 to swirl and self-stir to prevent precipitation of abrasive grains. 19 are provided in a branched manner via a throttle valve 20.

Further, an air nozzle 2l for stirring the abrasive liquid is provided at the center of the bottom of the inner tank 12, and an air filter 24 and a variable throttle valve 25 are installed in the air supply path 23 that connects the air nozzle 21 and the air pressure source 22. By using both the abrasive liquid self-stirring method using the abrasive liquid stirring nozzle 19 and the air jet agitation method, it is possible to prevent abrasive grains from settling on the lower surface and surrounding area of the impeller casing of the pump 14, and further enhance the abrasive liquid stirring effect.

Note that the abrasive liquid return port 26 and the inner tank l2 provided at the bottom of the wire saw are connected to an abrasive liquid recovery path 28 with a filter 27 in the middle.
A temperature measuring element 29 for measuring the temperature of the abrasive liquid in the inner tank l2 is attached to the upper lid 15, and one-touch fittings 30 are used for all piping for the abrasive liquid and air to the abrasive liquid tank 11. This makes it easy to replace the tank with a spare tank or to clean the tank.

The abrasive liquid circulation supply device of the present invention has the above-mentioned configuration, in which the wire saw 10 wire 1 is run and the work table 5 is connected to the work table 5.
When cutting the upper workpiece 2 into slices, the abrasive liquid supply path 18
The on-off valve 31 is opened and the abrasive liquid is supplied to the nozzles 6, 6.

The abrasive liquid overflows in a line shape from the slits 7 of the nozzles 6 and 6, and the abrasive liquid is supplied to the lower surface of the wire 1 immersed in this abrasive liquid, and the abrasive liquid flows between the lower surface of the wire 1 and the workpiece 2 for more than 10 minutes. This makes it possible to draw in the abrasive grains 3, thereby increasing lapping efficiency and improving processing accuracy and productivity.

In addition, in the abrasive liquid tank 11, an abrasive liquid supply pump l4
A part of the abrasive liquid discharged from the abrasive liquid is injected into the inner tank l2 by the abrasive liquid stirring nozzle 19, causing the abrasive liquid to swirl,
In addition to self-stirring, the abrasive grains are effectively prevented from settling by stirring by air supplied from the air nozzle 21.

<Effects> As described above, since the present invention has the above configuration, it has the following effects.

(I) A nozzle is placed extremely close to the lower running part of the wire outside the multi-groove roller group, and the wire is partially immersed in the abrasive liquid that overflows in a line from the upper slit of the nozzle. Since the abrasive liquid was supplied to the
It is possible to supply abrasive liquid to the lower surface of the wire, and also to uniformly supply the abrasive liquid to the entire area within the width of the wire, making it possible to reliably draw abrasive grains between the lower surface of the wire and the workpiece. It is possible to improve processing accuracy and productivity by increasing lapping efficiency.

Even if the abrasive liquid is supplied to the nozzle with coarse foreign matter or broken pieces of the workpiece mixed in, the abrasive liquid is supplied from the outside of the multi-groove roller group, so there is no problem with the V-groove portion of the multi-groove roller. Intrusion and biting of foreign matter can be prevented, and conversely, the centrifugal force caused by the rotation of the multi-groove rollers can scatter foreign matter to the outside of the multi-groove roller group, naturally preventing wire derailment accidents.

Since the wire is partially immersed in the abrasive liquid that spills out in a line from the slit of the nozzle, the same effect as the wire and workpiece immersed in the abrasive liquid can be obtained with a simple structure, making it simple. Improves workability.

(It) The distance between the axes of the multi-groove roller can be set to the minimum necessary, increasing the rigidity of the wire and improving the lapping efficiency. Moreover, there is no need to specially seal the abrasive liquid, so the distance between the axes of the multi-groove roller can be set to the minimum necessary. By freely intervening and scattering the abrasive liquid between the grooved roller and the O (to) workpiece, the mutual relative temperature difference is also averaged, and it is possible to improve machining accuracy.

(V) Since the abrasive liquid in the abrasive liquid tank is self-stirred by the abrasive liquid discharged from the abrasive liquid supply pump, the abrasive liquid supply pump and abrasive liquid agitation device can be integrated into one structure, simplifying the overall structure. The abrasive liquid tank can be made more compact, and the heat exchange efficiency with the outer tank having a double wall structure for adjusting the abrasive liquid temperature can be improved.

(II) The inner tank of the abrasive liquid tank is shaped like a mortar with a cylindrical upper part and a conical lower part, which eliminates blind spots for abrasive grain precipitation and reliably prevents abrasive grains with heavy specific gravity from settling at the bottom of the outer periphery. can do.

[Brief explanation of drawings]

Fig. 1 is a partially longitudinal perspective view of the structure of the abrasive liquid circulation supply device according to the present invention, Fig. 2 is a longitudinal sectional view showing the state of cutting a workpiece with a wire, and Fig. 3 shows the relationship between the wire saw and the nozzle. It is a front view. 1...Wire 2...Work 3...
Abrasive grain 5...Work table 7...Slit 12...Inner tank 14...Abrasive liquid supply pump l8...Abrasive liquid supply path 21...Air nozzle 4...Multi-groove roller 6...・Nozzle 11... Abrasive liquid tank 13... Outer tank 16... Motor 19... Abrasive liquid stirring nozzle

Claims (3)

[Claims] (1) Wires are wound in parallel in multiple layers around the outside of multiple multi-groove roller groups, and the wire is moved back and forth between the multi-groove rollers by reciprocating the multi-groove roller groups, and the wire moves between the multi-groove rollers. In a wire saw that cuts a workpiece with An abrasive liquid circulation supply device for a wire saw, characterized in that an abrasive liquid is supplied by an abrasive liquid supply pump in an abrasive liquid tank. (2) An abrasive liquid supply pump is housed inside the abrasive liquid tank, and a portion of the abrasive liquid is distributed in the circumferential direction of the inner wall of the abrasive liquid tank into the abrasive liquid supply path that connects the discharge port of the abrasive liquid supply pump and the nozzle. The abrasive liquid circulation supply device for a wire saw according to claim 1, characterized in that the abrasive liquid stirring nozzle for spraying the abrasive liquid is provided in a branched manner. (3) The abrasive liquid circulation supply device for a wire saw according to (2), wherein the abrasive liquid tank is formed in the shape of a mortar with a cylindrical upper part and a conical lower part.