JP2003103465A - Reclaiming method and reclaiming device for grinding abrasive grain body using magnetic field arrangement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recycling method and a reclaiming device for the method of separating, recovering and reclaiming abrasive grains and magnetic particles included in a magnetic fluid grinding tool or chips or the like produced by grinding without discarding the magnetic fluid grinding tool deteriorated in grinding capability by usage. SOLUTION: The reclaiming method is for the grinding abrasive grain body with a binding material containing the abrasive grains and magnetic particles solidified under an electromagnetic environment, and it is composed of a liquefying process of liquefying the solidified polishing abrasive grain body, a separating process of separating at least one of the abrasive grains or the magnetic particles from inside the binding material liquefied by the liquefying process, and a reclaiming process of reclaiming the grinding abrasive grain body by using a separated substance, a substance remaining in the binding material or the binding material. The liquefying process is carried out by heating the grinding abrasive grains or addition of a particular solvent reacting to the binding material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to abrasives and magnetic orientation particles (hereinafter referred to as "magnetic particles") which are substantially uniformly dispersed in a binder and solidified in a magnetic field environment for use in grinding or The present invention relates to a method and apparatus for reclaiming abrasive grains (hereinafter referred to as "abrasive grains").

[0002]

2. Description of the Related Art A fluid containing abrasive grains is solidified or gelled in accordance with the shape of a work piece, and a relative motion is generated between the fluid and the work piece to polish or grind the work piece (hereinafter A technique called "grinding" including polishing is appropriately known (Japanese Patent Laid-Open No. 11-165252 and Japanese Patent Laid-Open No. 11-165268).

The grindstone used in such a grinding technique is produced regardless of the shape of a mold or the like which is a workpiece and has abrasive grains fixed to a binder (bonding material). As the binder, a material that does not melt again when used once was used. Therefore, the inventors of the present application have disclosed in Japanese Patent Laid-Open No. 2000-351960.
As disclosed in Japanese Unexamined Patent Publication (KOKAI) No. 2004-331, a grinding stone capable of reversibly changing from a liquid phase to a solid phase or from a solid phase to a liquid phase by using a binder as a specific material and mixing magnetic powder Was developed. This made it possible to produce a grindstone having a shape that fits the shape of the mold.

As a matter of course, when the grindstone is used for the grinding work for a predetermined time or longer, the grindstone surface is consumed and the grinding force is reduced. The exhausted grindstone is discarded together with the polishing waste of the workpiece. Such a grindstone after grinding use contains consumables such as binders and magnetic materials, polishing dust, and abrasive grains, and the relatively expensive binders and grindstone components in them are also discarded together. It was.

[0005]

Such a grindstone can be changed from a solid state to a liquid state. Even if the grindstone has been used for polishing work, it can be liquefied. In principle, it is possible to separate and recover the substance that constitutes the grindstone contained therein.

However, from the viewpoint of the cost of separating and recovering the reusable substance from the used grindstone, in reality, the constituent substances of the grindstone are not separated and collected, and the environment protection of recent years is not performed. Also from the viewpoint of resource conservation, a low-cost and efficient technique for separating and recovering reusable substances from the used grindstone has been desired.

The present invention separates and recovers the abrasive grains, magnetic particles, or grinding debris generated by grinding, without discarding the magnetic fluidized grindstone whose grinding ability has deteriorated due to use, and reuses them. And a reproducing apparatus therefor.

[0008]

Therefore, the present invention is a method of regenerating an abrasive grain body for grinding using a magnetic field array in which a binder containing abrasive grains and magnetic particles is solidified in a magnetic field environment. A liquefaction step of liquefying the solidified abrasive particles for polishing, and a separation step of separating at least one of the abrasive particles or magnetic particles from the abrasive particles liquefied by the liquefying step. The present invention provides a method for reclaiming an abrasive grain for grinding.

The present invention further provides an abrasive grain body which is used for grinding an object to be ground by solidifying an abrasive grain body using a magnetic field array containing abrasive grains and magnetic particles in a magnetic field environment. Reclaiming method, a liquefaction step of liquefying the solidified abrasive particles for polishing, and from the binder liquefied by the liquefaction step, the abrasive particles, magnetic particles, or grinding debris generated by the grinding Provided is a method for reclaiming an abrasive grain for grinding, which includes a separation step of separating at least one of them, and a separation step.

Here, after the separating step, there is included a regenerating step of regenerating the abrasive grains for grinding by utilizing the separated substance, the substance remaining in the binder or the binder.

The first example of the liquefying step in the present invention is carried out by heating the solidified abrasive grains for grinding. Here, the abrasive grains for grinding are in a solidified state at room temperature, and the liquefaction temperature thereof is higher than the room temperature by a predetermined temperature. As an example, the liquefaction temperature of the binder is 35 to 85 ° C., and the liquefaction temperature of the abrasive grains for grinding containing the binder is 30 to 100 ° C. In order to set such a temperature range, the binder contains an additive for adjusting the temperature at which the grinding abrasive grains are solidified or liquefied. Further, when the operating environment temperature of the abrasive grains is 40 to 50 ° C. and the abrasive grains come to around 100 ° C. due to frictional heat during the grinding work or the polishing work, a high temperature melting binder or a high temperature binder is used. A liquefaction temperature adjusting additive is used.

The second step of the liquefaction step in the present invention
The example is performed by causing a solvent to act on the abrasive grains for grinding in a solidified state. Therefore, the solvent is liquefied by dissolving or softening the binder.

By the way, the solvent has a solubility capable of dissolving 3% or more of the binder by weight of the solvent. Further, by mixing the additive with the binder, the liquefaction temperature of the blended abrasive particles for grinding can be adjusted. Here, the amount of the additive added is 5 to 35% by weight with respect to the binder, and the liquefaction temperature of the abrasive grains such as grinding can be adjusted within the range of 1 to 15 ° C.

On the other hand, according to the present invention, an abrasive grain body in which a binder containing abrasive grains and magnetic particles is solidified in a magnetic field environment or a reclaiming device for the abrasive grain body used for grinding an object to be ground. A liquefying device for liquefying the solidified abrasive particles for polishing, and among the liquefied binder,
A separation device that separates at least one of the abrasive grains, magnetic particles, or grinding dust generated by the grinding, and reuses the separated substance or the substance remaining in the binder or the binder. It is an object of the present invention to provide a reclaiming device for a grinding abrasive grain utilizing a magnetic field array, which is provided with respective devices for generating a grinding abrasive grain.

Here, the first example of the liquefying apparatus is provided with a heating means for heating the solidified abrasive particles for grinding into a liquefied state. A second example of the liquefaction device is
A solvent charging means for charging a solvent to liquefy the solidified abrasive particles for grinding is provided.

Further, the separating device is provided with a filtering means for separating the liquefied abrasive grains for grinding into a mixed liquid containing abrasive grains and a binding material, and further, the liquefied abrasive grains. Centrifugal separation means for separating the abrasive particles and the mixed liquid by rotating the container for collecting the abrasive particles for use is provided.
Here, the separation device includes a settling tank for collecting the liquefied abrasive grains for grinding and a precipitation separating unit for precipitating the abrasive grains for grinding.

Then, the generating device generates the abrasive grains for grinding by reusing the separated substance, the substance remaining in the binder or the binder to mix them in a predetermined composition ratio. It will be equipped with a device.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION The details of an embodiment of a method for regenerating an abrasive grain for grinding and an abrasive grain reclaiming apparatus 1 utilizing a magnetic field array according to the present invention will be described in detail below with reference to the drawings.

The magnetically oriented grindstone for grinding (hereinafter, appropriately referred to as "abrasive grain body") which is the object of the present invention, has the abrasive grains and the magnetically oriented particles dispersed almost uniformly in the binder, and the abrasive grains and magnetic oriented particles are dispersed in a magnetic field environment. It is used after being solidified. Therefore, the abrasive particles are composed of at least abrasive particles, magnetic particles, and a binder for uniformly dispersing and solidifying these particles.

Here, the abrasive grains are abrasives and are the basic constituent components of the abrasive grain body, the magnetic particles are magnetic field orientation alignment materials, and are the driving force (driving force) for forming the abrasive grain array (column). Further, the bonding material is in a liquefied state when the abrasive grains are arranged, and is constituted by a substance mixture that can be cooled and solidified to hold the abrasive grain arrangement and repeat liquefaction and solidification. And
The present abrasive grain is obtained by mixing and prescribing these abrasive grains, magnetic particles, and a binder in the optimum proportions for grinding and polishing.

FIG. 1 is a diagram for explaining the principle of recycling in which the abrasive grains for grinding are repeatedly liquefied and solidified in this embodiment.

As shown in FIG. 1, after the liquid abrasive grains are injected into the object to be ground, an abrasive grain array is formed when a magnetic field is applied. The abrasive grains are solidified by cooling, and the solidification makes it possible to maintain the stable state of the abrasive grain arrangement.
The abrasive particles are used in the grinding operation in a solidified state, and when the grinding operation is completed, the abrasive particles are melted by heating or adding a solvent to be liquefied again.

The magnetic particles constituting the abrasive grains are sensitive to a magnetic field, but are usually insoluble in acid. The binder is liquefied by being heated or by being dissolved in a special solvent. Further, the abrasive grains are insensitive to magnetic fields and are not soluble in acid. Grinding dust is sensitive to a magnetic field depending on an object to be polished such as an iron material. It may also be dissolved by acid.

According to the present invention, the characteristics of each of these constituent substances constituting the abrasive grain body are utilized to regenerate the abrasive grain body, and the useful constituent substance contained in the abrasive grain body is separated and recovered for reuse. It is for.

By the way, the liquefaction temperature of the abrasive particles for grinding which is solidified at room temperature is higher than the room temperature by a predetermined temperature. Therefore, in order to liquefy the solidified abrasive particles, the abrasive particles are heated to a liquefying temperature of 30 to 100 ° C. or a solvent is added to liquefy the abrasive particles. The liquefaction temperature of the binder is 3
The temperature is 5 to 85 ° C., and the liquefaction temperature of the abrasive grains for grinding containing it is 30 to 100 ° C. The binder contains an additive for adjusting the temperature at which the abrasive grains for grinding solidify or liquefy.

Incidentally, examples of the abrasive grains used in the present invention include aluminum oxide, silicon dioxide, diamond and the like, and ferrite is used as the magnetic abrasive grains.

Further, examples of the binder include methyl stearate, stearyl stearate and myristyl myristate. Further, as an additive for adjusting the melting point, there is sorbidan tristearate.

Incidentally, in order to prevent the abrasive grains from becoming brittle, rubber powder, rubber chips, sponge or the like may be used as an additive. Such an additive is for adjusting the flexibility of the abrasive grain, and is different from the above melting point adjusting additive. When the flexibility of the abrasive grain increases due to the use of such a flexibility adjusting additive, the pressure on the surface to be ground decreases, so the addition amount is determined in consideration of the balance with the grinding performance. There is a need.

The liquefaction process in this embodiment is carried out by causing a solvent to act on the abrasive particles in the solidified state. Therefore, trichlorethylene was used as the solvent. The solvent dissolves or softens the binder to make it liquid. Then, the solvent has a solubility capable of dissolving 3% or more of the binder by its own weight.

By mixing the additive with the binder, the liquefaction temperature of the blended abrasive particles for grinding can be adjusted. The amount of additive added is 5 with respect to the binder.
It is possible to adjust the liquefaction temperature of the abrasive grains such as grinding in the range of 1 to 15 ° C.

Next, in the step of separating the magnetic particles from the liquefied abrasive grains, while the liquefied abrasive grains are being stirred, a magnet consisting of an electromagnet or a permanent magnet that has been energized is inserted, The magnetic particles in the abrasive are attached. After a lapse of a predetermined time, the magnet to which the magnetic particles are attached is pulled up to remove the abrasive grains and the binder which are attached to the magnetic particles, and then the magnetic particles attached to the magnet are collected.

On the other hand, the liquid abrasive grains from which the magnetic particles have been removed are poured into an abrasive grain recovery filter and separated into a solid phase containing abrasive grains and a solution phase of a binder by a filtration step. To be done. The solid powder recovered by the abrasive recovery filter is dried, then mixed with concentrated nitric acid or the like and subjected to an acid treatment for standing for a predetermined time. The grinding dust contained in the solid powder is melted,
When filtered, the solid phase becomes abrasive grains and the liquid phase becomes an acid solution of grinding dust and can be separated. The separated abrasive grains are neutralized and washed with a neutralizing solution such as an aqueous solution of sodium carbonate, dried and then recovered and regenerated.

When the binder solution filtered by the abrasive recovery filter is heated and depressurized by the vacuum distillation apparatus, trichlorethylene in the solution is vaporized. The vaporized trichlorethylene is cooled, liquefied again, and collected in a container. In this way, the abrasive grains, the binder and the solvent are separated and recovered.

In such a separating step, a method of using a precipitation separating means for precipitating the abrasive grains having a precipitation tank for collecting the liquefied abrasive grains for grinding may be used. The separating device for this purpose may use a centrifugal separating means for separating the abrasive particles and the mixed liquid by rotating the container in which the liquefied abrasive particles for grinding are collected. The abrasive grains, the binder, and the solvent thus recovered are re-prepared, regenerated as the material of the abrasive grains, and then reusable as the abrasive grains for grinding.

Next, the configuration and function of the abrasive grain regenerating apparatus 1 according to the present invention will be described together with the operation. FIG. 2 is a block diagram showing an example of an embodiment of an abrasive grain regenerating apparatus 1 for abrasive grains using a magnetic field array. As shown in FIG. 2, the abrasive grain reclaiming device 1 is roughly divided into four parts: a magnetic field processing unit 2, a vacuum filtration unit 3, a vacuum distillation unit 4, and a control unit 5.

The magnetic field treatment unit 2 separates the magnetic particles, the vacuum filtration unit 3 separates the abrasive grains, and the vacuum distillation unit 4 separates the trichlene and the binder. Further, the magnetic field processing unit 2 includes an abrasive grain dissolving tank 6, a magnetic particle recovery filter 7, an electromagnet unit (upper) 8, an electromagnet unit (upper) drive unit 9, an electromagnet unit (lower) 1
It is composed of 0 and a trichlene tank unit 11.
The trichlene tank unit 11 is composed of a tank 15 for storing a trichlene (trichloroethylene) liquid for dissolving the binder, a solenoid valve A18, and a nozzle 16.

FIG. 3 is a flow chart for explaining the starting of the abrasive grain regenerating apparatus 1 and the recovery of magnetic particles. Also, FIG.
3 is a flow chart for explaining a magnetic substance separating operation.

Next, each process constituting the present invention will be described with reference to FIGS. First, the abrasive grain dissolving tank 6
When the abrasive grains to be separated are put in and the electromagnetic valve A18 is released, trichlorethylene (hereinafter referred to as trichlene) as a dissolving agent is injected from the nozzle 16 (S1 to S5).

When the abrasive grain dissolving tank 6 is filled with the dissolving agent, the air pushing force is not working without operating the compressor A17. A sensor A19 is provided in the abrasive grain dissolving tank 6 to detect the amounts of trichlene and the abrasive grains (S6). When trichlene is filled, the electromagnetic valve A18 is closed by the signal of the sensor A19 (S7).

When the dissolution of the abrasive grains is started, the electromagnet unit 8 is lowered into the abrasive grain dissolution tank 6 so as to be sufficiently melted, and the inside of the abrasive grain dissolution tank is stirred without being energized. (S20, S21). When sufficiently dissolved by stirring for a predetermined time, the electromagnet unit (upper) 8 is energized to generate a magnetic force and adsorb magnetic particles (S22). Even during this adsorption, the inside of the abrasive grain dissolving tank 6 is slowly agitated and rotated. This is to collect all the magnetic particles. After sufficient adsorption, electromagnet unit (top)
No. 8 is pulled upward and continues to rotate above the center of the abrasive grain dissolving tank (S23).

At this point, the compressor A17 starts operating and sends air to the nozzle 16. When the solenoid valve A18 is released and trichlene is injected into the nozzle 16, trichlene is ejected from the nozzle 16 in a shower shape. The shower of trichlene is poured onto the magnetic particles adsorbed on the rotating electromagnet unit (upper) 8 (S24). As a result, the abrasive grains fixed together with the magnetic particles and the binder remaining due to the viscosity have a role of flowing off.

In these treatments, since the abrasive grains circulate in the abrasive grain dissolving tank 6 to scrape the inner wall, at least the inner wall 22 at this time has a high hardness and is resistant to trichlorethylene. For example, a material such as hard stainless steel is required.

When the washing with trichlene is completed,
The electromagnet unit (upper) 8 moves onto the magnetic particle recovery filter 7 by the electromagnet unit (upper) drive unit 9 (S2).
5). The electromagnet unit (upper) drive unit 9 is a unit that drives the electromagnet unit 8. The magnetic particle recovery filter 7 and the abrasive grain dissolving tank 6 are moved back and forth. The movement direction is the rotation direction of the three axes of X, Y and Z + the axis 8a. Rotation using X, Y, and Z is performed because the stage of melting the abrasive grains is a stirring rotation. When cleaning the collected magnetic particles, the axis 8 of the electromagnet unit (upper) 8
Rotation is performed by rotating around a.

The magnetic particle recovery filter 7 is a unit for recovering the magnetic particles taken out from the abrasive grain dissolving tank 6. The magnetic particle recovery filter 7 includes a waste liquid receiver 12 and an electromagnet unit (lower) 10. The magnetic particle recovery filter 7 is equipped with a sensor C13 and detects when the magnetic particle recovery filter 7 reaches a certain amount (S8). Sensor D14 for waste liquid receiver 12
Is attached, and it is detected that the amount of waste liquid reaches a certain amount (S9). Magnetic particle recovery filter 7 and waste liquid receiver 1
2 is a drawer type and can be taken out (S17, S14).

The electromagnet unit (upper) 8 is a so-called electromagnet wound with a coil, and this unit collects magnetic particles. At the time of recovery, electricity is applied to attach magnetic particles by magnetic force. When it is dropped on the magnetic particle recovery filter 7, the power is turned off (S26). When not operating, it stands by above the magnetic particle recovery filter 7. As the metal of the shaft core used for the magnet, it is preferable to use a metal whose residual magnetic flux density is as close to 0 as possible (for example, metal such as permalloy).

However, actually, due to various factors, not all the magnetic particles fall due to the residual magnetism even when the power supply is cut off. Therefore, the electromagnet unit (lower) 10 is provided. The electromagnet unit (lower) 10 is energized when the electromagnet unit (upper) 8 cuts off the electric current at the upper part of the magnetic particle recovery filter 7 to drop the magnetic particles, and the magnetic particles that have not fallen are attracted by magnetic force from below (S27). ).

In this way, the magnetic particle recovery filter 7
The accumulated magnetic particles are left for a while for drying, and the magnetic particles are collected together with the magnetic particle recovery filter 7 to complete the recovery of the magnetic particles. In order to accelerate this drying,
It is also preferable to equip the magnetic particle recovery filter 7 with a dryer that accelerates drying with warm air. After the magnetic particles are collected, the abrasive grains, the trichlene, the binder and the like remain in the abrasive grain dissolving tank 6. If the abrasive grains being treated are those after being used for the polishing treatment, grinding debris is also mixed.

In FIG. 5, the abrasive particles after the magnetic particles are recovered are filtered by the abrasive particle recovery filter 25 of the vacuum filter unit 3, and the filtered solution (mixture of trichlene and the binder) is recovered in the recovery container A. It is a flow chart explaining operation.

A solenoid valve B2 is provided below the abrasive grain dissolving tank 6.
0 is attached and opened after magnetic particles are collected, and the object to be separated is made to flow through the abrasive particle collection filter 25 of the vacuum filtration unit 3.
A sensor B21 is attached to the lower part of the solenoid valve B20 to detect whether or not the separation target has completely flowed (S32).

The vacuum filtration unit 3 includes an abrasive grain recovery filter 25 and a recovery tank 2 for recovering the binder and trichlene.
6, sensor E27, sensor F28, sensor G2
9, a solenoid valve C30, and a compressor B31. The abrasive grain collecting filter 25 can be pulled out, and the sensor E27 detects the amount of abrasive grains of the abrasive grain collecting filter 25 and the amounts of trichlene and the binder (S3).
0).

Solenoid valve B20 under the abrasive grain dissolving tank 6
Are released, and the abrasive grains, the binder, and trichlene are poured onto the abrasive grain collecting filter 25 of the vacuum filtration unit 3. However, due to the nature and viscosity of the binding material, the liquid material will not fall off by its own weight, so the suction force is exerted from below. When the compressor B31 discharges air to the outside of the apparatus, air is sucked through the chamber 60. This suction force promotes filtration. The chamber has a shielding wall 60a as shown in the figure, and the liquid material does not flow to the compressor B31 by the force of suction.

In this embodiment, the abrasive grain collecting filter 25 is used.
However, the separation device may be a centrifugal separation means for rotating the container in which the liquefied abrasive particles for grinding are collected to separate the abrasive particles and the mixed liquid. Further, as another method, a method of using a precipitation separating means that has a precipitation tank for collecting the liquefied abrasive grains for grinding and precipitates the abrasive grains may be used.

The filtered liquid (mixture of trichlene and binder) is accumulated in the recovery tank 26. The amount is detected by the sensor F28 attached to the recovery tank 26 (S31). The solenoid valve C30 detects when the sensor F28 detects the liquid surface of the liquid or when the filtration time exceeds a certain level.
The compressor B31 is stopped, the electromagnetic valve C30 is released, and the liquid is flown into the container A32 of the vacuum distillation unit 4 (S3
2 to S38). When the sensor G29 stops detecting the flow of liquid, or the sensor H of the vacuum distillation unit
When 36 detects, the solenoid valve C30 is closed (S40).

On the abrasive grain collecting filter 25, the abrasive grains and the grinding dust not collected by the electromagnet unit (upper) 8 are mixed. This mixed substance is taken out from the abrasive grain reclaiming apparatus 1 together with the abrasive grain recovery filter 25, acid-treated in a container containing an acidic solvent, and then neutralized and washed with an aqueous sodium hydrogen carbonate solution. Then, after washing with water and drying, the recovery of the abrasive grains is completed (this part is not shown). Naturally, it is easy to configure the apparatus so that the acid treatment is performed, and it is also possible to equip the dryer as already described.

FIG. 6 is a flow chart for explaining the operation of separating the filtered liquid (the mixed liquid of trichlene and the binder) performed by the vacuum distillation unit 4. FIG. 7 is a flowchart illustrating the separation process and the end process.

6 and 7, the vacuum distillation unit 4 includes a container A32, a container A rotating unit 34 (rotational drive system), a sensor H33, a hot bath 35, and a sensor I3.
6, solenoid valve D37, solenoid valve E38, solenoid valve F39, electric jack 40, container B41, sensor J42, distillation tube 4
3, a distillation tube cooling unit 44, and a compressor C45.

As described above, the liquid flows into the container A32 from the recovery tank 26 of the vacuum filtration unit 3 by opening the electromagnetic valve C30. Therefore, when the sensor H36 detects the rise of the liquid level or the sensor G29 stops detecting the flow, the solenoid valve C30 is closed. After that, the electric jack 40 rises and stops at a fixed position (S45).

Then, with the electromagnetic valve E38 closed, the electromagnetic valve D37 loaded in the path from the water intake port opens and water flows into the hot bath 35 (S46). here,
When the sensor I33 detects the liquid surface position of the water, the solenoid valve D
37 is closed and water supply is stopped (S47, S48). The container A rotation unit 34 starts rotating the container A 32, and at the same time operates the hot bath 35 to raise the water temperature (S49, S50, S51).

The hot bath 35 is set to a temperature at which trichlene boils (vaporizes) under reduced pressure to warm water. Container A32
The reason for rotating is that a so-called bumping phenomenon occurs in which sudden large boiling occurs unless the liquid is moved.

Here, when the hot water temperature reaches a predetermined temperature, the compressor C45 is operated and the pressure is reduced. Since the distillation tube cooling unit 44 has been operating since the power was turned on, it has already been cooled. The trichlene heated and vaporized by the hot bath 35 under reduced pressure cools the inside of the distillation pipe cooling unit 44 steam pipe 43 in the steam pipe 43 and also cools it from the outer wall by the cold air blown around the steam pipe 44. It is liquefied and flows into the container B41. The heat insulating material 61 has an external temperature shielding function for maintaining the cooling temperature. The secondary cooling unit 62 is an auxiliary cooling device for completely liquefying and recovering trichlene that has not been liquefied in the distillation tube cooling unit 44.

When the sensor J42 detects or when a certain time has elapsed, the operation of the compressor C45, the heating of the hot bath 35, and the rotating operation of the container A32 are stopped (S52, S53, S56). Then, the solenoid valve F39 is slowly opened to gradually return to atmospheric pressure (S75). The electromagnetic valve F39 is opened and returned to the atmospheric pressure sufficiently, and then closed again (S76). Finally, the binder remains in the container A32,
Trichrene remains in the container B41. And hot bath 35
The water is released by releasing the solenoid valve E38 (S71, S7).
2, S73). In the case of the end, the end button is pressed to turn off the power and end (S80 to 82). When the above operation is completed, each container is removed and each drug is collected.

The control unit 5 is a part of the control system 50 that controls this apparatus, and cooperates with each sensor to turn on / off a motor, open / close a solenoid valve, energize an electromagnet, and the like. Control the behavior of. Further, the abrasive grain reproducing apparatus 1 has various operation buttons on the operation panel (not shown). The panel has a power on / off switch, a restart button, an emergency stop button, etc. Further, a display for operation is provided, and a progress status display, sensor on / off display, and the like are performed (not shown).

As described in detail above, according to the present invention, a solidified abrasive grain for polishing is regenerated for the purpose of regenerating the abrasive grain body for which a binder containing abrasive grains and magnetic particles is solidified in a magnetic field environment. Liquefaction step of liquefying, and a separation step of separating at least one of the abrasive grains or magnetic particles from the binder liquefied by the liquefaction step, and remaining in the separated substance or the binder It consists of each step of reclaiming the abrasive grains for grinding by using the substance or the binder, and the magnetic orientation grindstone whose grinding ability is deteriorated by use is included in it without being discarded. We have realized a low-cost and efficient recycling method and a device for that that enable separation and recovery of abrasive grains, magnetic particles or grinding debris generated by grinding and reuse them. A.

Further, in view of recent environmental problems, the present technology plays an important role in separating the constituent materials of the abrasive grains without discarding them as they are and linking them to proper treatment.
For example, in the environmental standards such as ISO14000, it is becoming important that the zero emission does not generate industrial waste at all. By using the present invention, it is possible to realize a zero emission factory.

In the apparatus of FIG. 2 used for the explanation of the present invention, magnetic particles are collected by magnetism in the first step from the liquefied abrasive particles, but the abrasive particles and the magnetic particles are collected. Since the particle size differs in order, it is possible to separate the abrasive particles from the magnetic particles using a filter with a mesh of appropriate size, and in order to improve the separation performance, Centrifugation technology can be applied.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a recycling principle according to the present invention in which an abrasive grain for grinding is repeatedly liquefied and solidified.

FIG. 2 is a block diagram showing an embodiment of an abrasive grain separating device for an abrasive grain using a magnetic field array according to the present invention.

FIG. 3 is a flowchart for explaining the start-up of an abrasive grain separating device and the recovery of magnetic particles according to the present invention.

FIG. 4 is a flowchart illustrating a magnetic substance separating operation according to the present invention.

FIG. 5 illustrates an operation according to the present invention in which the abrasive particles after magnetic particle recovery are filtered by an abrasive particle recovery filter, and the filtered liquid (a mixed liquid of trichlene and a binder) is recovered in a recovery container A. It is a flowchart.

FIG. 6 is a flow chart for explaining the operation of separating the filtered liquid (the mixed liquid of trichlene and the binder) performed by the vacuum distillation unit 4 according to the present invention.

FIG. 7 is a flowchart illustrating a separation step and an end step according to the present invention.

[Explanation of symbols]

1 Abrasive particle separation device 2 2 Magnetic field processing unit 3 Vacuum filter unit 4 Vacuum distillation unit 5 control unit 6 Abrasive particle melting tank 6 7 Magnetic particle recovery filter 8 Electromagnet unit (upper) 9 Electromagnet unit (upper) drive 10 Electromagnet unit (bottom) 11 Triclen tank unit 11 12 Waste liquid receiver 15 tank 15 16 nozzles 17 Compressor A 25 Abrasive particle recovery filter 26 Recovery Tank 31 Compressor B 32 container A 34 Container A rotation unit 35 hot bath 41 Container B 43 Distillation tube 44 Distillation tube cooling unit 45 Compressor C 61 Thermal insulation 62 Secondary cooling unit

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B09B 5/00 B09B 3/00 303Z // B24B 37/00 ZAB B24D 3/00 340 304Z 5/00 Z ( 72) Inventor Tokuji Umehara 2-46-3-102, Bessho, Hachioji-shi, Tokyo (72) Inventor Kazuya Eedura 2-9-1-306 Higashishinkoiwa, Katsushika-ku, Tokyo Within New Technology Management (72) Inventor Shibata 430 Kobayashi, Masuho-cho, Minamikoma-gun, Yamanashi Prefecture F-term in Niska Corporation (reference) 3C047 FF08 GG14 GG15 3C058 AA07 AC01 CB06 3C063 AA02 BB02 BB03 BB04 BC01 BC03 BD01 BD04 CC30 EE09 FF23 FF30 4D004 CA34 CA12 BA10 CA22 CA34 CA40 CA41 CB02 CB21 DA01 DA03 DA06 DA11

Claims (19)

[Claims] 1. A method of regenerating an abrasive grain for grinding, which comprises solidifying a binder containing abrasive grains and magnetic particles under a magnetic field environment, comprising a liquefying step of liquefying the solidified abrasive grain for polishing, From the binder liquefied by the liquefaction process,
A method of reclaiming an abrasive grain body using a magnetic field array having a separation step of separating at least one of the abrasive grains and the magnetic particles. 2. A method for regenerating an abrasive grain body used for grinding an object to be ground, wherein a binder containing abrasive grains and magnetic particles is solidified in a magnetic field environment, and the solidified abrasive grain for polishing is reclaimed. A liquefaction step of liquefying the particles, and from the binder liquefied by the liquefaction step,
A method for reclaiming an abrasive grain body using a magnetic field array having a separation step of separating at least one of the abrasive grains, magnetic particles, or grinding dust generated by the grinding. 3. The method further comprising, after the separating step, a regenerating step of regenerating the abrasive grains by utilizing the separated substance, the substance remaining in the binder or the binder. The method for reclaiming an abrasive grain for grinding according to 1 or 2. 4. The method for reclaiming an abrasive grain for grinding according to claim 1, wherein the liquefying step is a step of heating the solidified abrasive grain for grinding. 5. The method for reclaiming an abrasive grain for grinding according to claim 4, wherein the abrasive grain for grinding is in a solidified state at room temperature, and its liquefaction temperature is a temperature higher by a predetermined temperature than the room temperature. 6. The liquefaction temperature of the binder is 35 to 85 ° C.
The liquefaction temperature of the abrasive particles for grinding containing the binder is 30 to 100 ° C.
Abrasive particles for grinding as described. 7. The method for reclaiming an abrasive grain for grinding according to claim 4, wherein the binder contains an additive for adjusting a temperature at which the abrasive grain for grinding solidifies or liquefies. . 8. The liquefying step is performed by causing a solvent to act on the abrasive particles for grinding in a solidified state.
4. The method for reclaiming an abrasive grain for grinding according to any one of items 1 to 3. 9. The method for reclaiming an abrasive grain for grinding according to claim 8, wherein the solvent is liquefied by dissolving or softening the binder. 10. The solvent for dissolving a binder according to claim 9, wherein the solvent has a solubility capable of dissolving 3% or more of the binder based on its own weight. 11. The abrasive grain for grinding according to claim 7, wherein the additive can adjust the liquefaction temperature of the compounded abrasive grain for grinding by being mixed with a binder. How to play. 12. The addition amount of the additive is 5 to 35% by weight with respect to the binder, and the liquefaction temperature of the abrasive such as grinding can be adjusted within a range of 1 to 15 ° C. The additive for adjusting the liquefaction temperature according to claim 11. 13. A regrind for an abrasive grain used for grinding an abrasive grain for grinding, which is obtained by solidifying a binder containing abrasive grains and magnetic particles under a magnetic field environment, A liquefaction device for liquefying the solidified abrasive particles for polishing, and a separation for separating at least one of the abrasive particles, the magnetic particles, or the grinding dust generated by the grinding from the liquefied binder. An apparatus, a generating apparatus that reuses the separated substance or the substance remaining in the binder or the binder to generate the abrasive grains for grinding, and a grinding apparatus that uses a magnetic field array including each device. Abrasive body recycling device. 14. The magnetic field arrangement according to claim 13, wherein the liquefaction device is provided with a heating unit for heating the solidified abrasive particles for grinding into a liquefied state. Reclaiming device for grinding particles. 15. The magnetic field array according to claim 13, wherein the liquefying device is provided with a solvent charging means for charging a solvent to liquefy the grinding abrasive grains in a solidified state. Reclaiming device for grinding particles. 16. The separation device according to claim 13, further comprising a filtering unit for separating the liquefied abrasive particles for grinding into abrasive particles and a mixed liquid containing a binder. An apparatus for reclaiming abrasive grains using the described magnetic field arrangement. 17. The separation device includes a centrifugal separation unit that separates the abrasive particles and the mixed liquid by rotating a container in which the liquefied abrasive particles for grinding are collected. An apparatus for reclaiming an abrasive grain for grinding using the magnetic field array according to claim 13. 18. The separating device comprises a settling tank for collecting the liquefied abrasive grains for grinding, and a sedimentation separating unit for precipitating the abrasive grains for grinding. An apparatus for reclaiming abrasive grains using the magnetic field arrangement described in. 19. A generator for generating the abrasive grains for grinding by reusing the separated substance, the substance remaining in the binder or the binder to mix them in a predetermined constituent ratio. A device is provided.
An apparatus for reclaiming abrasive grains using the magnetic field arrangement according to item 3.