JP4640596B2 - Cutting apparatus and cutting method - Google Patents

Description

  The present invention relates to a cutting apparatus and a cutting method used for cutting, for example, rare earth sintered magnets, and more particularly to a novel cutting apparatus and a cutting method that do not require bonding of an object to be cut at the time of cutting.

  With the demand for miniaturization of various electric parts such as motors and the demand for improvement in the characteristics of magnets corresponding to the demand, development of high-performance small magnets is required. In such a situation, for example, an R-T-B system such as an Nd-Fe-B magnet (R is one or more rare earth elements. T is essential for Fe and contains other metal elements). Magnets have advantages such as excellent magnetic properties, Nd, which is a main component, and abundant resources, and are relatively inexpensive. Therefore, demand for magnets has been increasing in recent years.

  As a method for producing a rare earth sintered magnet, powder metallurgy is known and widely used because it can be produced at low cost. In the method of manufacturing a rare earth sintered magnet by the powder metallurgy method, first, a raw material alloy ingot is first roughly pulverized and finely pulverized to obtain a raw material alloy powder having a particle size of about several μm. The raw material alloy powder obtained in this way is magnetically oriented in a magnetic field, and molding is performed with the magnetic field applied. After molding in a magnetic field, the compact is sintered in a vacuum or in an inert gas atmosphere.

  In the production of the rare earth sintered magnet by the above-described powder metallurgy method, machining (cutting) for making the obtained rare earth sintered magnet into a predetermined shape is required. In the case of rare earth sintered magnets manufactured by powder metallurgy, the compact is greatly shrunk during the sintering process, so that products that require high dimensional accuracy require cutting and surface processing. In the case of a small magnet, a method of reducing the size by cutting from a large block is also employed.

  For cutting, a wire or a rotary blade is generally used, but a rotary blade (so-called outer periphery slicer) using diamond abrasive grains is often used particularly because of its versatility. And when using a rotary blade, in consideration of productivity etc., a plurality of rotary blades for the purpose of obtaining as many cutting pieces (magnet products) as possible from one block by one cutting operation. (For example, refer to patent documents 1 etc.).

In the invention described in Patent Document 1, a workpiece (cutting object) coated with an adhesive is bonded to a bonding plate made of carbon or the like, the bonding plate in a state where the workpiece is bonded is attached to a cutting device, and the workpiece is cut. Disconnect by. Then, the workpiece obtained by cutting | disconnecting a workpiece | work and a sticking board are immersed in the alkaline solvent of pH9-11, and a workpiece is removed from a sticking board. As described in the above-mentioned Patent Document 1, when a magnet is attached using an adhesive, the cut pieces are not separated one after the other after the cutting process, and the rotary blade is prevented from being damaged, or the cut pieces There is also a merit that the risk of splashing can be avoided. During or after cutting using the rotary blade, if the cut pieces are broken apart, there is a risk that the rotary blade is caught by the rotary blade and damaged, or the cut pieces are scattered around.
JP 2002-307284 A

  By the way, when cutting a cutting target object by the technique of the said patent document 1, the process of adhering a cutting target object to a sticking board and the process of peeling a cut piece from a sticking board using a solvent after cutting | disconnection are required. In this case, for example, in the bonding process, it takes time until the adhesive is cured, and by including these two processes, productivity is significantly reduced.

  The present invention has been proposed in view of such a conventional situation, and provides a cutting device and a cutting method that can cut an object to be cut stably without requiring an adhesion step or a peeling step. The purpose is to do. It is another object of the present invention to provide a cutting apparatus and a cutting method that do not cause the rotary blade to be damaged by the cut pieces and that do not cause any risk of the cut pieces flying around.

In order to achieve the above-described object, the cutting device of the present invention cuts the cutting object in a direction substantially perpendicular to the clamping direction, a clamping means for clamping the cutting object before cutting and the cutting piece after cutting. The clamping means is constituted by a pair of clamp parts having a locking recess on the abutting surface and having slits corresponding to the cutting positions, and by moving these in a substantially horizontal direction, Both side edges of the object to be cut are locked by the locking recesses, and part of the upper and lower surfaces are supported by locking pieces formed by forming the locking recesses. Further, the cutting method of the present invention uses a clamping means comprising a pair of clamp parts having a locking recess on the abutting surface and having slits corresponding to the cutting positions, and the clamp part is arranged in a substantially horizontal direction. By moving, both side edges of the object to be cut are locked to the locking recesses, and part of the upper and lower surfaces are supported by locking pieces formed by forming the locking recesses. The cutting object is cut in a direction substantially perpendicular to the clamping direction, and each cut piece is clamped by the clamp piece even after the cutting.

  In the cutting device and the cutting method of the present invention, the object to be cut is fixed and held by the clamping means, and in this state, the object to be cut is cut in a direction perpendicular to the clamping direction by a rotary blade or the like. Therefore, there is no need to bond and fix the object to be cut, and no bonding step with an adhesive is necessary. Moreover, the cutting piece can be taken out by opening the clamp means, and a peeling step for peeling the cut piece after cutting is unnecessary.

  Furthermore, after cutting, each cut piece is maintained in a clamped state by the clamping means. Therefore, the cut pieces do not fall apart, and the risk of the cutting blades being damaged by the cut pieces and the risk of the cut pieces flying around are avoided.

  Further, the cut piece after cutting can be easily taken out by opening the clamping means and dropping it downward, for example. This is defined in the invention according to claim 13 of the present application, in which the cutting object is clamped in a substantially horizontal direction, the rotary blade is moved in a substantially vertical direction and the cutting object is cut. The cutting piece is dropped downward by opening. In this case, the fallen cut piece may be collected, for example, in a storage container as described in claim 14.

  According to this invention, it is possible to cut | disconnect in the state which hold | maintained the cutting | disconnection target object stably, without requiring an adhesion process or a peeling process. Therefore, it is possible to provide a cutting device and a cutting method with excellent productivity. In addition, since the cut pieces do not fall apart after cutting, there is no risk of damaging the rotary blade by the cut pieces, and a cutting apparatus and a cutting method that do not have the risk of the cut pieces flying around are provided. Is possible.

  Hereinafter, a cutting device and a cutting method to which the present invention is applied will be described in detail with reference to the drawings.

  FIG. 1A shows an example of a cutting apparatus to which the present invention is applied. This cutting device has a cutting mechanism in which a pair of clamp parts 2 and 3 (clamping means) for holding (clamping) a rare earth sintered magnet 1 that is an object to be cut and a plurality of rotary blades (outer slicers) 4a are arranged in parallel. 4 and a container 5 for collecting cut pieces after cutting below the clamp portions 2 and 3. In the case of this example, the rare earth sintered magnet 1 has a cross-sectional arc shape obtained by curving a plate-like body in the width direction, and an arc-shaped cut piece is obtained by cutting this.

  The clamp portions 2 and 3 are formed with locking recesses 2a and 3a on the abutting surfaces thereof, and can be held stably by locking both side edges of the rare earth sintered magnet 1 respectively. It has a structure. In particular, at the time of clamping, the top and bottom surfaces of the rare earth sintered magnet 1 are supported by the locking pieces 2b, 3b and 2c, 3c formed vertically by the formation of the locking recesses 2a, 3a. The magnetized magnet 1 does not move in the vertical direction in the figure, and a stable holding state is realized.

  The locking pieces 2b, 3b and 2c, 3c need to be designed to dimensions that do not abut each other when the rare earth sintered magnet 1 is clamped by the clamp portions 2, 3. When the rare earth sintered magnet 1 is clamped, if the locking piece 2b and the locking piece 3b, or the locking piece 2c and the locking piece 3c first come into contact with each other, the clamping force is not applied to the rare earth sintered magnet 1. There is a risk that stable and reliable clamping becomes difficult.

Butt length of surface L ₁ of the clamping portion 2, as shown in FIG. 1 (A), said being a rare earth sintered slightly greater than the length L ₂ of the magnet 1, thus, during clamping The entire rare earth sintered magnet 1 is held. Further, slits 2d and 3d are formed on the abutting surfaces of the clamp portions 2 and 3 corresponding to the cutting position, and the rotary blade 4a of the cutting mechanism 4 allows the rare earth sintered magnet 1 to be placed at the slit position. Will be disconnected. In this case, the cut pieces after cutting are also clamped by the portions between the slits of the clamp portions 2 and 3, respectively. Therefore, the rare earth sintered magnet 1 is either cut before or after being cut by the clamp portions 2 and 3. The clamped state will be maintained.

  The clamp portions 2 and 3 may be formed of a material having a certain degree of rigidity and excellent mechanical durability. For example, the clamp portions 2 and 3 may be formed of a metal such as stainless steel (SUS) or brass, but have good holding performance. In order to realize the state and prevent cracking and the like of the rare earth sintered magnet 1 that is the object to be cut, it is preferable to use so-called engineering plastic for at least one of them. In this case, the engineering plastic may be used for both of the clamp parts 2 and 3, or one of the clamp parts may be formed of engineering plastic and the other clamp part may be formed of metal. Engineering plastics are excellent in mechanical strength and durability, and can be deformed to some extent, so that they are optimal in achieving a good holding state and preventing cracking of the object to be cut. The engineering plastic may be any plastic material that falls within the category, and examples thereof include acetal resin, polyamide, polycarbonate, polybutylene terephthalate, and polyethylene terephthalate. Among these, an acetal resin or the like is particularly preferable from the viewpoints of bending strength, hardness, wear resistance, and the like.

  When the clamp parts 2 and 3 are formed of the engineering plastic, the slits 2d and 3d may be formed simultaneously with the cutting when the rare earth sintered magnet 1 is first cut. The slits 2d and 3d are simply formed by cutting the clamp portions 2 and 3 formed of engineering plastic and not having the slits 2d and 3d by the cutting means 4 together with the rare earth sintered magnet 1.

  The clamp portions 2 and 3 clamp the rare earth sintered magnet 1 in a substantially horizontal direction, whereas the cutting mechanism 4 is movable in a direction perpendicular to this (that is, in the vertical direction). The rare earth sintered magnet 1 is cut in a direction perpendicular to the clamping direction by moving downward. In this cutting, the cutting mechanism 4 does not necessarily need to move linearly in the orthogonal direction. For example, when the cutting mechanism 4 is attached to the tip of the arm, the arc moves along the rare earth sintered magnet 1 to be cut and moves so as to cut it. Are also movable in the orthogonal direction. That is, the movement form of the cutting mechanism 4 is arbitrary, and the cutting may be advanced in the orthogonal direction.

  As described above, the cutting mechanism 4 includes a plurality of rotating blades 4a arranged in parallel via spacers, and cuts the rare earth sintered magnet 1 on the outer periphery of each rotating blade 4a. Therefore, this cutting mechanism 4 is a so-called outer periphery slicer. In order to obtain a rare earth sintered magnet cut piece having a desired dimension by the cutting, the number of the rotary blades 4a and the spacer width may be appropriately adjusted according to the number of cuts and the cut width.

  As each cutting blade 4a, for example, a cemented carbide substrate with abrasive grains (for example, diamond abrasive grains) attached is used, and it is preferable to cool the rare earth sintered magnet 1 which is a cutting target when cutting. Therefore, although the illustration is omitted, the cutting device of the present embodiment is preferably provided with a cooling mechanism for cooling the rare earth sintered magnet 1. Examples of the cooling mechanism include a mechanism for supplying a cooling liquid such as a polishing liquid containing water or abrasive grains to the surface of the rare earth sintered magnet 1.

  The above is the mechanism for cutting, but the container 5 is installed below the sintered rare earth sintered magnet 1. The container 5 is for collecting the cut pieces of the rare earth sintered magnet 1 after cutting. When the clamp parts 2 and 3 are opened after cutting, each cut piece is released from the holding state by the clamp parts 2 and 3. It is opened, falls by gravity and is accommodated in the container 5.

  The storage container 5 may be anything as long as it can store the cut pieces. For example, a rectangular housing container or the like is used. It is preferable that at least the bottom surface is mesh-shaped so that the pieces and the coolant can be separated. In addition, a shock absorbing material may be provided on the bottom surface of the container 5 in order to absorb an impact when the cut piece is dropped due to gravity and prevent cracking and the like.

  The above is the configuration of the cutting device. Next, a cutting method using the cutting device will be described. Here, first, the production of the rare earth sintered magnet 1 that is an object to be cut will be briefly described, and then the cutting of the produced rare earth sintered magnet 1 will be described.

  The rare earth sintered magnet 1 has, for example, a rare earth element R, a transition metal element T, and boron as main components, but the magnet composition is not particularly limited, and may be arbitrarily selected according to the application. For example, the rare earth element R specifically means Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb or Lu. 1 type (s) or 2 or more types can be used. Among these, it is preferable that the main component as the rare earth element R is Nd because it is abundant in resources and relatively inexpensive. Moreover, as the transition metal element T, any conventionally used transition metal element can be used. For example, one or more of Fe, Co, Ni and the like can be used. Among these, Fe and Co are preferable from the viewpoint of sinterability, and it is particularly preferable to mainly include Fe from the viewpoint of magnetic characteristics. In addition to the rare earth element R, transition metal element T, and boron B, the inclusion of other elements is allowed. For example, elements such as Al, Cu, Zr, Ti, Bi, Sn, Ga, Nb, Ta, Si, V, Ag, and Ge can be appropriately contained. On the other hand, it is desirable to reduce impurity elements such as oxygen, nitrogen, and carbon as much as possible. In particular, the amount of oxygen that impairs magnetic properties is preferably 7000 ppm or less, more preferably 5000 ppm or less. This is because when the amount of oxygen is large, the rare-earth oxide phase, which is a nonmagnetic component, increases and the magnetic properties are deteriorated. The rare earth sintered magnet 1 to be cut is not limited to the RTB-based rare earth sintered magnet. For example, the rare earth sintered magnet 1 may be an SmCo-based sintered magnet or the like, and it is effective to apply the cutting method of the present invention to these.

  The rare earth sintered magnet 1 is manufactured by a powder metallurgy method, and its manufacturing process basically includes an alloying process, a coarse pulverization process, a fine pulverization process, a molding process, a sintering process, and an aging process. The In order to prevent oxidation, most of the steps after sintering are performed in a vacuum or in an inert gas atmosphere (in a nitrogen gas atmosphere, an Ar gas atmosphere, etc.).

  In the alloying step, a raw material metal or alloy is blended according to the composition of the desired rare earth alloy powder, and melted in a vacuum or an inert gas, for example, Ar atmosphere, and cast to form an alloy. As the casting method, any method can be adopted, but the strip casting method (continuous casting method) in which a molten high-temperature liquid metal is supplied onto a rotating roll and the alloy thin plate is continuously cast is a viewpoint of productivity and the like. From the viewpoint of the form of the resulting alloy.

  As the raw material metal (alloy) used in the alloying, pure rare earth elements, rare earth alloys, pure iron, ferroboron, and alloys thereof can be used. As the alloy, a single alloy having almost the final magnet composition may be used, or a plurality of types of alloys having different compositions may be mixed so as to have the final magnet composition.

  In the coarse pulverization step, the previously cast raw alloy thin plate, ingot, or the like is pulverized until the particle size is about several hundred μm. As the pulverizing means, a stamp mill, a jaw crusher, a brown mill, or the like can be used. In order to improve the coarse pulverization property, it is effective to perform coarse pulverization after occlusion of hydrogen and embrittlement.

  After the above-described coarse pulverization step is completed, a lubricant is added to the coarsely pulverized raw material alloy powder as necessary. As the lubricant, for example, a fatty acid compound can be used, and in particular, by using a fatty acid or fatty acid amide having a melting point of 60 ° C. to 120 ° C. as a lubricant, good magnetic properties, in particular, a high degree of orientation. A rare earth sintered magnet having high magnetization can be obtained, and the strength of the compact can be adjusted to a predetermined value depending on the type and amount of addition.

  After the coarse pulverization step, a fine pulverization step is performed. This fine pulverization step is performed using, for example, an airflow pulverizer. The conditions for fine pulverization may be appropriately set according to the airflow pulverizer to be used, and the raw material alloy powder is finely pulverized until the average particle size becomes about 1 to 10 μm, for example, 3 to 6 μm. A jet mill or the like is suitable as the airflow pulverizer.

  After the pulverization step, the raw material alloy powder is formed in the magnetic field in the magnetic field forming step. Specifically, the raw material alloy powder obtained in the fine pulverization step is filled in a mold in which an electromagnet is arranged, and is molded in a magnetic field in a state where crystal axes are oriented by applying a magnetic field. The forming in the magnetic field may be either a vertical magnetic field forming in which the forming pressure and the magnetic field direction are parallel, or a horizontal magnetic field forming in which the forming pressure and the magnetic field direction are orthogonal to each other. Further, a pulse power source and an air-core coil can be employed as the magnetic field applying means. The forming in the magnetic field may be performed in a magnetic field of 700 to 1600 kA / m, for example, at a pressure of 30 to 300 MPa, preferably about 130 to 160 MPa.

  After forming into a predetermined shape by the forming step, a sintering process is performed on the formed body in the sintering step. In the sintering process, the compact is sintered in a vacuum or in an inert gas atmosphere (such as in an Ar gas atmosphere). The sintering temperature needs to be adjusted according to various conditions such as composition, pulverization method, difference in particle size and particle size distribution, etc. For example, sintering may be performed at 1000 to 1200 ° C. for about 1 to 10 hours. It is preferable to do. In addition, in a sintering process, it is preferable to perform a degreasing process prior to sintering as needed.

  After the sintering, the obtained sintered body is preferably subjected to an aging treatment. This aging treatment is an important step in controlling the coercive force Hcj of the obtained rare earth magnet. For example, the aging treatment is performed in an inert gas atmosphere or in a vacuum. As the aging treatment, a two-stage aging treatment is preferable, and in the first aging treatment step, the temperature is maintained at a temperature of about 800 ° C. for 1 to 3 hours. Next, a first quenching step is provided for quenching to room temperature to 200 ° C. In the second stage aging treatment step, the temperature is maintained at about 550 ° C. for 1 to 3 hours. Next, a second quenching step for quenching to room temperature is provided. Since the coercive force Hcj is greatly increased by heat treatment at around 600 ° C., when aging treatment is performed in a single stage, it is advisable to perform aging treatment at around 600 ° C.

  The rare earth sintered magnet 1 produced as described above is cut into a predetermined dimension (thickness) by the above-described cutting device. The cutting method is shown in FIGS. 1 (A) to 1 (D). FIGS. 2A to 2D are schematic views of each process as viewed from the side.

  When the rare earth sintered magnet 1 is cut, as shown in FIGS. 1A and 2A, the cutting mechanism 4 is moved upward and the clamp portions 2 and 3 are opened to cut the object to be cut. The rare earth sintered magnet 1 is clamped by the clamp portions 2 and 3. In this clamping, after one side edge of the rare earth sintered magnet 1 is locked to one clamp part 2, the other clamp part 3 is inserted into the opposite side edge of the rare earth sintered magnet 1 and further pushed in. It is sufficient to clamp with. Alternatively, the clamp portions 2 and 3 are brought close to each other so that the distance between the clamp portions 2 and 3 is slightly larger than the width dimension of the rare earth sintered magnet 1, and formed by the locking recesses 2 a and 3 a of these clamp portions 2 and 3. It is also possible to insert the rare earth sintered magnet 1 from the side into the space to be clamped, and then press the clamp portions 2 and 3 in the direction of the arrows to clamp them.

  FIG. 1B and FIG. 2B show a clamped state of the rare earth sintered magnet 1. As shown in these drawings, the rare earth sintered magnet 1 has both side edges locked by locking recesses 2a and 3a provided in the clamp portions 2 and 3, respectively, and a part of the upper and lower surfaces thereof is a locking piece 2b. , 2c, 3b, 3c and is clamped stably over the entire length. The clamping direction is almost horizontal.

  Next, while maintaining the clamped state, the cutting mechanism 4 is moved downward, and the rare earth sintered magnet 1 is cut by each rotary blade 4a. At this time, the cutting mechanism 4 may be moved substantially downward in the vertical direction, or may be slightly lowered from the oblique direction so that the rotary blade 4 a enters obliquely with respect to the rare earth sintered magnet 1. Further, at the time of cutting, the rare earth sintered magnet 1 is cut while being cooled by the cooling liquid. The rotation speed of the rotary blade 4a is set to about 3000 to 8000 rpm, preferably 3500 to 5000 rpm.

  By the movement of the cutting mechanism 4, the rare earth sintered magnet 1 is cut as shown in FIGS. 1 (C) and 2 (C). In the cutting, it is preferable to reduce the cutting speed to the final stage (a predetermined period before the rare earth sintered magnet 1 is completely cut). This is because, since the cutting is performed without adhesion, if the cutting speed is kept constant until the end, there is a possibility that cracks and the like may occur at the end of the cutting. For example, when the remaining decision is 200 μm to 300 μm, the inconvenience can be solved by reducing the cutting speed to about 30% to 80% of the cutting speed at the start of cutting. The above setting is particularly effective for cutting a sintered body typified by a rare earth sintered magnet.

  Further, after the cutting by the rotary blade 4a, the cutting mechanism 4 is raised and the rotary blade 4a is pulled out from the rare earth sintered magnet 1. In this case, it is preferable to pull out after stopping the rotation of the rotary blade 4a. When the rare earth sintered magnet 1 is fixed by the clamping force of the clamp parts 2 and 3, some movement of the cut piece after cutting is unavoidable, and if the rotary blade 4a is rotated and pulled out, it will be inadvertent This is because the cut piece may be damaged.

  After the cutting, as shown in FIGS. 1 (D) and 2 (D), the cutting mechanism 4 is raised and the clamp portions 2 and 3 are opened. Until then, each of the cut pieces 1a is maintained in the clamped state by the clamp portions 2 and 3, but is released from the clamp portions 2 and 3 by the opening, falls by gravity, and is stored in the storage container 5.

  At this time, the cut piece 1a after cutting can be removed from the space between the clamp parts 2 and 3 to the side, thereby enabling processing in a single plane, but the slits 2d, Since 3d is formed, the cut piece 1a is caught by these slits 2d and 3d at the time of extraction, and smooth removal is difficult. In particular, when a magnetic force remains in the cut piece 1a, the cut pieces 1a are attracted to each other, making the removal more difficult. On the other hand, if the clamp parts 2 and 3 are opened and dropped downward, the cut piece 1a can be easily and smoothly taken out.

  By using the above-described cutting apparatus and cutting method, it is possible to cut smoothly without bonding the rare earth sintered magnet as the workpiece. Therefore, an adhesion process and a peeling process are unnecessary, and efficient cutting is possible. Furthermore, since the clamped state is maintained for the cut pieces after cutting, there is no possibility of damaging the rotary blade by the cut pieces after cutting, and there is no risk of the cut pieces flying around.

  The embodiments of the cutting apparatus and the cutting method to which the present invention is applied have been described above, but it goes without saying that the present invention is not limited to these embodiments, and various modifications can be made without departing from the scope of the present invention. Is possible. For example, as shown in FIG. 3, the present invention can be similarly applied to a cutting object (rare earth sintered magnet) 11 having a rectangular cross section. Furthermore, as shown in FIG. 4, the present invention can be similarly applied to a cutting object (rare earth sintered magnet) 12 having a thick section and a substantially sector shape. In this case, in order to further stabilize the clamped state, the shape of the locking recesses 2a and 3a is multi-staged, and in addition to the support by the locking pieces 2b, 2c, 3b and 3c, the stepped portions 2e, It is preferable to support the end surface of the cutting object 12 by 3e.

  Next, specific examples of the present invention will be described.

  The cutting device used in this example is the same as the cutting device shown in FIGS. 1 (A) to 1 (D). In addition, the rotary blade 4a used what fixed the diamond abrasive grain (particle size 170 mesh or less) to the cemented carbide substrate. The outer diameter of the rotary blade 4a is 60 mm, the thickness is 0.5 mm, and the rotation speed is 5000 rpm. A multi-set cutting mechanism 4 in which 12 rotary blades 4a are arranged is used.

  In cutting the rare earth sintered magnet 1, a coolant was used as a coolant. The rare earth sintered magnet 1 as an object to be cut is an Nd—Fe—B based sintered magnet, and its dimensions are 45 mm × 9 mm × 3 mm.

  The rare earth sintered magnet 1 was clamped by the clamp parts 2 and 3 and cut by the cutting mechanism 4 having the rotary blade. The cutting speed at the time of cutting was 0.5 mm / second, and the cutting speed at the end of the cutting was 0.35 mm / second. Moreover, after cutting, the rotary blade 4a was stopped and pulled out, and then the clamp pieces 2 and 3 were opened and the cut piece 1a was collected in the storage container 5 disposed below.

  By cutting the rare earth sintered magnet 1 under the above conditions, the processing capacity could be improved by about 20% compared to the case of cutting by adhesive fixation. In addition, the occurrence of defects due to cracks could be suppressed to the same extent as in the case of cutting by adhesive fixing.

It is a schematic perspective view which shows schematic structure of the cutting device to which this invention is applied. It is a schematic perspective view which shows the clamped state of a rare earth sintered magnet. It is a schematic perspective view which shows a cutting | disconnection state. It is a schematic perspective view which shows the taking-out state of the cut piece by open | release of a clamp means after a cutting | disconnection. (A)-(D) are the schematic diagrams seen from the side corresponding to FIG.1 (A) -FIG.1 (D), (A) is the state before a clamp, (B) is a clamped state, ( C) shows a cut state, and (D) shows a clamp open state after cutting. It is a side view which shows typically a clamped state in case the cross-sectional shape of a cutting target object is a rectangular shape. It is a side view which shows typically a clamp state in case the cross-sectional shape of a cutting target object is a fan shape.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rare earth sintered magnet, 2, 3 Clamp part, 2a, 3a Locking recessed part, 2b, 2c, 3b, 3c Locking piece, 2d, 3d slit, 4 Cutting mechanism, 4a Rotary blade, 5 Container, 11, 12 Cutting object

Claims (14)

Clamp means for clamping the cutting object before cutting and the cutting piece after cutting, and a rotary blade for cutting the cutting object in a direction substantially perpendicular to the clamping direction ,
The clamp means is composed of a pair of clamp parts having a locking recess on the abutting surface and slits corresponding to the cutting positions, and by moving these in a substantially horizontal direction, both sides of the cutting object An edge is locked to the locking recess, and a part of the upper and lower surfaces is supported by a locking piece formed by forming the locking recess . The cutting apparatus according to claim 1, wherein at least a part of the clamp part is formed of an engineering plastic .   The cutting apparatus according to claim 2, wherein the engineering plastic is an acetal resin. The cutting apparatus according to claim 2 or 3, wherein the length of the butting surfaces of the pair of clamp portions is larger than the length of the cutting object.   The cutting device according to any one of claims 1 to 4, wherein a plurality of the rotary blades are arranged in parallel.   The cutting apparatus according to any one of claims 1 to 5, further comprising a storage container for storing a cut object after cutting. The cutting apparatus according to claim 6, wherein the storage container is disposed below a clamp position of the object to be cut.   The cutting apparatus according to any one of claims 1 to 7, further comprising a cooling mechanism that cools an object to be cut at the time of cutting.   The cutting apparatus according to any one of claims 1 to 8, wherein the object to be cut is a sintered body.   The cutting apparatus according to claim 9, wherein the sintered body is a rare earth sintered magnet. By using a clamping means comprising a pair of clamp parts having a locking recess on the abutting surface and having slits corresponding to the cutting positions, and moving the clamp part in a substantially horizontal direction, the cutting object Clamping the cutting object by locking both side edges of the locking recess to the locking recess and supporting a part of the upper and lower surfaces by the locking piece formed by forming the locking recess,
Cutting the object to be cut in a direction substantially perpendicular to the clamping direction;
A cutting method characterized in that each cut piece is clamped by the clamp piece even after the cutting. The cutting method according to claim 11, wherein the cutting object is cut by moving the rotary blade in a substantially vertical direction .   13. The cutting method according to claim 12, wherein after the cutting, the cutting means is dropped downward by opening the clamp means.   14. The cutting method according to claim 13, wherein the dropped cut piece is stored in a storage container disposed below.

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