Liquid supply device and liquid supply method, and method for manufacturing RTB-based sintered magnet

Abstract

To provide a liquid supply device and a liquid supply method, and a method for manufacturing an R-T-B-based sintered magnet which can suppress variations in a liquid supply amount.SOLUTION: A liquid supply device 1 for supplying liquid L from discharge parts 5 connected to a plurality of electromagnetic valves 4 includes a liquid holding part 2 for holding the liquid L and supplying the liquid L to the plurality of electromagnetic valves 4, and an air supply part 3 including an air supply source 3a for supplying air and an air supply pipe 3b which is connected to the air supply source 3a and the plurality of electromagnetic valve 4 and is branched so that pressure of air supplied to the plurality of electromagnetic valve 4 from the air supply source 3a becomes uniform, wherein the plurality of electromagnetic valves 4 are connected to the liquid holding part 2 and the air supply part 3, and perform switching of the liquid L supplied to the discharge part 5 and the air, and the discharge parts 5 are provided on each of the plurality of electromagnetic valves 4.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a liquid supply device, a liquid supply method, and a method for producing an RTB based sintered magnet. [Background technology]

[0002] It is generally known that when molding using a mold, a release agent is applied to the mold before molding in order to prevent mold galling. For example, in Patent Document 1, a release agent ejection mechanism is inserted between two fixed and movable casting molds, and the release agent is supplied to the cavity surfaces of both molds. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-096352 Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, casting is performed by injecting molten metal into a mold, so errors in the amount of release agent supplied to the mold rarely have a significant impact on the variation in unit weight of the molded body. However, when molding an alloy powder supplied to a mold, such as an RTB-based sintered magnet (R is at least one rare earth element and always includes at least one of Nd and Pr; T is at least one transition metal element and always includes Fe), if the amount of release agent supplied is too high, the release agent may interfere with the supply of the alloy powder. Conversely, if the amount of release agent supplied is too low, the mold may become galled. Therefore, if there is a large error in the amount supplied, the variation in unit weight of the molded body will increase when molding multiple magnets at once.

[0005] Therefore, an object of the present disclosure is to provide a liquid supplying device and liquid supplying method that can suppress variations in the amount of liquid supplied, and a method for producing an RTB based sintered magnet. [Means for solving the problem]

[0006] In view of the above, the liquid supply device of the present disclosure has, in exemplary embodiment 1, a plurality of solenoid valves. Each is provided From the outlet , a mold release agent is added to each cavity of a mold that can mold multiple pieces at once. A liquid supply device that supplies release agent Hold release agent a liquid holding portion for supplying the liquid; an air supply source for supplying the air; Connect with Continued ,workman The liquid supply unit includes an air supply pipe that is equally branched so that the air pressure is uniform, and the plurality of solenoid valves are connected to the liquid holding unit and the air supply unit. Air supply pipe and connect to The release agent supplied from the liquid holding section and the air supplied from the air supply pipe Switch the air cormorant , a liquid supply device. In a second aspect, the liquid supply device according to the first aspect is such that, when the blowing pressure (MPa) of the air supplied to the solenoid valve is x and the blowing time (s) is y, the air is supplied so as to satisfy the formulas (1) and (2). x>0.1 (1) y≧0.29x -1 (2)

[0007] In the third aspect, the discharge section is tube and a nozzle, tube The liquid supply device according to aspect 1 or 2, wherein the nozzle is made of a metal material and the nozzle is made of a resin material.

[0008] Aspects 4 In the embodiment, an inner taper is formed at the end of the nozzle. 3 2 is a liquid supply device according to the first embodiment. In a fifth aspect, the liquid supply device according to the third or fourth aspect is characterized in that the supply pipe is made of a fluororesin.

[0009] Aspects 6 In a liquid supply device that supplies liquid from a discharge portion connected to a plurality of solenoid valves, the liquid supply device comprising: a liquid holding portion that holds the liquid and supplies the liquid to the plurality of solenoid valves; an air supply portion that includes an air supply source for supplying air; and an air supply pipe that is connected to the air supply source and the plurality of solenoid valves and is provided so as to be equally branched so that the pressure of the air supplied from the air supply source to the plurality of solenoid valves is uniform; the plurality of solenoid valves are connected to the liquid holding portion and the air supply portion, and switch between the liquid and the air that are supplied to the discharge portion, and the discharge portion is provided for each of the plurality of solenoid valves;This is a liquid supply method using a liquid supply device, and includes: a liquid supply step in which liquid is supplied from a liquid holding portion to a plurality of solenoid valves; and an air supply step in which, after the liquid supply step, air is supplied from an air supply portion to the plurality of solenoid valves by switching the plurality of solenoid valves, pushing the liquid from the plurality of solenoid valves to a discharge portion, and discharging the liquid from the discharge portion. In the air supply step, air is supplied so as to satisfy equations (1) and (2), where x is the blow pressure (MPa) and y is the blow time (s). x>0.1 (1) y≧0.29x -1 (2)

[0010] Aspects 7 In a liquid supply device that supplies liquid from a discharge portion connected to a plurality of solenoid valves, the liquid supply device comprising: a liquid holding portion that holds the liquid and supplies the liquid to the plurality of solenoid valves; an air supply portion that includes an air supply source for supplying air; and an air supply pipe that is connected to the air supply source and the plurality of solenoid valves and is provided so as to be equally branched so that the pressure of the air supplied from the air supply source to the plurality of solenoid valves is uniform; the plurality of solenoid valves are connected to the liquid holding portion and the air supply portion, and switch between the liquid and the air that are supplied to the discharge portion, and the discharge portion is provided for each of the plurality of solenoid valves; This is a method for producing an RTB sintered magnet (R is at least one rare earth element and always includes at least one of Nd and Pr; T is at least one transition metal element and always includes Fe) using a liquid supply device. The method includes the following steps: an alloy powder preparation step for preparing an RTB alloy powder; a molding step for supplying a release agent to a die, and then supplying the RTB alloy powder to the die and molding it to obtain a green body; and a sintering step for heating the green body to obtain a sintered body. The release agent is supplied to the die through the following steps: a release agent supply step for supplying the release agent from a liquid holding unit of the liquid supply device to multiple solenoid valves; and an air supply step for supplying air from an air supply unit to the multiple solenoid valves by switching the multiple solenoid valves after the release agent supply step, thereby forcing the release agent from the multiple solenoid valves to a discharge unit and discharging the release agent from the discharge unit. In the air supply step, air is supplied so as to satisfy the following equations (1) and (2), where x is the blow pressure (MPa) and y is the blow time (s). x>0.1 (1) y≧0.29x -1 (2)

[0011] Aspects 8 In the above embodiment, when the RTB alloy powder is supplied to the mold, the discharge part is moved to a position separated from the mold, and air is supplied from the discharge part to push out the mold release agent remaining in the discharge part. 7This is a method for producing the RTB based sintered magnet described in . [Effects of the Invention]

[0012] The liquid supply device and liquid supply method, and the method for producing an RTB based sintered magnet of the present disclosure make it possible to suppress variations in the amount of liquid supplied. [Brief explanation of the drawings]

[0013] [Figure 1] 1 shows a schematic diagram of a liquid supply device according to an embodiment; [Figure 2] 1A and 1B show enlarged cross-sectional views of the end of a nozzle according to an embodiment, where (a) shows the case where the end of the nozzle is formed only from a flat portion, (b) shows the case where the end of the nozzle is formed only from a flat portion and an inner taper, and (c) shows the case where the end of the nozzle is formed only from an inner taper. [Figure 3] 10 is a graph showing the relationship between the shape of the nozzle end and the spray diameter. [Figure 4] 1 is a graph showing the correlation between the blow pressure (MPa) and the blow time (s) that satisfies the condition that the difference in discharge amount, obtained by subtracting the minimum discharge amount from the maximum discharge amount of the release agent, is less than 0.02 g. DETAILED DESCRIPTION OF THE INVENTION

[0014] An exemplary embodiment of a liquid supply device 1 will now be described with reference to FIGS.

[0015] Fig. 1 shows a schematic diagram of a liquid supplying device 1. As shown in Fig. 1, the liquid supplying device 1, which supplies a liquid L to an object (such as a mold), has a liquid holding unit 2, an air supplying unit 3, a plurality of electromagnetic valves 4 (one is shown in Fig. 1), and a discharge unit 5 provided for each of the plurality of electromagnetic valves 4.

[0016] The liquid holding unit 2 is configured to hold the liquid L and to be connected to each of the multiple solenoid valves 4 so that the liquid L can be supplied. The material of the liquid holding unit 2 may be any material and can be selected appropriately depending on the liquid L to be used. For example, if the liquid L is a mold release agent, a resin material can be used. Furthermore, in order to more accurately control the amount of liquid L supplied to the multiple solenoid valves 4, syringes may be provided between the liquid holding unit 2 and the multiple solenoid valves 4. In this case, the liquid L is supplied from the liquid holding unit 2 to the syringe, and then the liquid L is supplied from the syringe to the multiple solenoid valves 4. Note that the device is not limited to syringes as long as it is possible to control the amount of liquid L supplied to the multiple solenoid valves 4.

[0017] The air supply unit 3 is for supplying air to push out the liquid L supplied from the liquid holding unit 2, and has an air supply source 3a and an air supply pipe 3b that connects the air supply source 3a to multiple solenoid valves 4.

[0018] The air supply source 3a is a supply source for supplying air. The supplied air may be any type of air, and may be appropriately selected from inert gases, atmospheric gases, etc. Examples of inert gases include, but are not limited to, N2 gas and Ar gas.

[0019] The air supply pipe 3b is formed so that the supply pipe branches out evenly from the air supply source 3a toward the multiple solenoid valves 4. By branching the supply pipe evenly, the supply distance and pressure loss from the air supply source 3a to the multiple solenoid valves 4 can be made uniform, making it possible to uniform the pressure of the air supplied to the multiple solenoid valves 4. Furthermore, by making the air pressure uniform, the pressure for pushing out the liquid L supplied from the liquid holding portion 2 becomes uniform, making it possible to suppress variations in the amount of liquid L supplied.

[0020] The plurality of solenoid valves 4 are connected to the liquid holding portion 2, the air supply portion 3, and the discharge portion 5, and switch between the liquid L and air supplied to the discharge portion 5. The timing of the switching is controlled by a control portion (not shown).

[0021] The discharge unit 5 is provided for each of the plurality of solenoid valves 4, and includes a supply pipe 5a and a nozzle 5b. The supply pipe 5a is for supplying the liquid L from the plurality of solenoid valves 4 to the nozzle 5b, and is preferably used, for example, when there is a distance between the plurality of solenoid valves 4 and the nozzle 5b. While the embodiment includes the supply pipe 5a and the nozzle 5b, this is not limitative and only the nozzle 5b may be provided. The supply pipe 5a is made of a resin material, for example, urethane. More preferably, the interior of the supply pipe 5a should be made of a material that has low friction with the liquid L, such as fluororesin. This makes it difficult for the liquid L to stagnate within the supply pipe 5a, and makes it possible to suppress variations in the amount of liquid L supplied.

[0022] Nozzle 5b is connected to supply pipe 5a and serves to discharge the liquid L. The material of nozzle 5b may be either a metal material or a resin material, but a metal material such as Al is less likely to deform even with repeated use and makes it easier to maintain a uniform flow path diameter for liquid L. This also makes it possible to suppress variations in the amount of liquid L supplied.

[0023] For example, the nozzle 5b may have a cylindrical shape with a hollow interior, and the shape of the end (liquid discharge end) of the nozzle 5b may be as shown in Figures 2(a) to 2(c). Figures 2(a) to 2(c) show enlarged cross-sectional views of the end of the nozzle 5b. Figure 2(a) shows a case where the end of the nozzle 5b is formed only from a flat portion 5b1. Figure 2(b) shows a case where the end of the nozzle 5b is formed from a flat portion 5b2 and an inner taper 5b3. In this case, the flat portion 5b2 is located on the outer periphery of the nozzle, and the inner taper 5b3 is located on the inside. The inner taper 5b3 is recessed below the flat portion 5b2 to form a truncated cone space. Figure 2(c) shows a case where the end of the nozzle 5b is formed only from an inner taper 5b4 (where the flat portion is not substantially formed). In Figure 2(c), the inner taper 5b4 is recessed more deeply than in Figure 2(b), forming a truncated cone space. The flat surface does not have to be a strict flat surface, and may have some irregularities or inclinations. In other words, it may be a substantially flat surface.

[0024] The shape of the end of the nozzle 5b is preferably such that the spread (spray diameter) of the liquid L when ejected is small, since this reduces variations in the amount of liquid L supplied. Figure 3 is a graph showing the measurement results of the nozzle end shape and the spray diameter (φ) when ejecting a droplet of 1 ml at an air pressure of 0.2 MPa. (a) shows the result when the nozzle of Figure 2(a) was used, (b) shows the result when the nozzle of Figure 2(b) was used, and (c) shows the result when the nozzle of Figure 2(c) was used. As can be seen from Figure 3, the spray diameter decreases in the order of (a), (b), and (c). In other words, the spray diameter is smaller when the inner tapers 5b3 and 5b4 are provided. This suggests that providing an inner taper at the end of the nozzle 5b is more preferable.

[0025] Next, a liquid supply method using the liquid supply device 1 will be described. First, the liquid L is supplied from the liquid holding portion 2 to the plurality of solenoid valves 4 (liquid supply step). Thereafter, the plurality of solenoid valves 4 switch from a state in which the liquid L can be supplied to a state in which air can be supplied, and air is supplied from the air supply portion 3 to the plurality of solenoid valves 4. When air is supplied, the air pressure (blow pressure) pushes the liquid L from the plurality of solenoid valves 4 to the discharge portion 5, causing the liquid to be discharged from the discharge portion 5 (air supply step).

[0026] In the air supplying step, it is advisable to supply air so as to satisfy the formulas (1) and (2), where x is the blowing pressure (MPa) and y is the blowing time (s). x>0.1 (1) y≧0.29x -1 (2)

[0027] As shown in formula (1), the blow pressure (MPa) is desirably higher than 0.1 MPa. If the blow pressure is 0.1 MPa or lower, even if the blow time (s) is extended, the force to push out the liquid L from the discharge port 5 will be insufficient, and the supply amount of the liquid L discharged from the discharge port 5 will not be stable. A more preferable blow pressure (MPa) is higher than 0.1 MPa and equal to or lower than 1 MPa, and an even more preferable range is higher than 0.1 MPa and equal to or lower than 0.7 MPa.

[0028] The blow time (s) is the time for which air is supplied, and is preferably a blow time (s) that satisfies formula (2) at a pressure higher than 0.1 MPa. If the blow time (s) does not satisfy formula (2) even when the blow pressure (MPa) is high, the time for pushing out the liquid L from the discharge port 5 will be insufficient, and the supply amount of liquid L discharged from the discharge port 5 will not be stable.

[0029] Furthermore, by satisfying formulas (1) and (2), the difference in the discharge amounts, obtained by subtracting the minimum discharge amount from the maximum discharge amount of liquid L discharged multiple times, can be kept to less than 0.02 g. If formulas (1) and (2) are not satisfied, the difference will be 0.02 g or more, resulting in large variations and making it difficult to stably supply liquid L. Note that, in this embodiment, the difference in the discharge amounts when discharged 10 times is less than 0.02 g, but this is not limited to the case as long as the discharge is performed multiple times.

[0030] Next, we will explain the method for producing an RTB sintered magnet (R is at least one rare earth element and must contain at least one of Nd and Pr. T is at least one transition metal element and must contain Fe) using the liquid supply device 1. First, an RTB alloy powder is prepared (alloy powder preparation step).

[0031] Next, the release agent is supplied to the plurality of solenoid valves 4 from the liquid holding section 2 of the liquid supply device 1, which contains the release agent as the liquid L (release agent supply step). When a predetermined amount of release agent has been supplied, the supply is switched by the plurality of solenoid valves 4, and air is supplied from the air supply section 3 to the plurality of solenoid valves 4, The release agent is forced out from the electromagnetic valves 4 to the discharge portion 5, and is discharged from the discharge portion 5 (air supplying step).

[0032] In the air supplying step, it is advisable to supply air so as to satisfy the formulas (1) and (2), where x is the blowing pressure (MPa) and y is the blowing time (s). x>0.1 (1) y≧0.29x -1 (2)

[0033] As shown in formula (1), the blow pressure (MPa) is preferably higher than 0.1 MPa. If the blow pressure is 0.1 MPa or lower, even if the blow time (s) is extended, the force to push out the release agent in the discharge part 5 is insufficient, and the amount of release agent discharged from the discharge part 5 is not stable. A more preferred blow pressure (MPa) is higher than 0.1 MPa and not higher than 1 MPa, and an even more preferred range is higher than 0.1 MPa and not higher than 0.7 MPa.

[0034] The blow time (s) is preferably a blow time (s) that satisfies formula (2) at a pressure higher than 0.1 MPa. If the blow time (s) does not satisfy formula (2) even if the blow pressure (MPa) is high, the time for pushing out the release agent in the discharge part 5 will be insufficient, and the supply amount of the release agent discharged from the discharge part 5 will not be stable.

[0035] Furthermore, by satisfying the formulas (1) and (2), the difference in the discharge amount, obtained by subtracting the minimum discharge amount from the maximum discharge amount of the release agent discharged multiple times, can be made less than 0.02 g. If the formulas (1) and (2) are not satisfied, the difference will be 0.02 g or more, which will result in large variations and make it difficult to stably supply the release agent. In this embodiment, the difference in the discharge amount when the release agent is discharged 10 times is less than 0.02 g, but this is not limited to this as long as the release agent is discharged multiple times.

[0036] After the release agent is supplied to the mold in the air supplying step, the RTB alloy powder is supplied to the mold and molded to obtain a compact (molding step). When the RTB alloy powder is supplied to the mold, the discharge part 5 may be moved to a position away from the mold, and air may be continuously supplied from the discharge part 5. By continuously supplying air in this way, the release agent remaining in the discharge part 5 can be pushed out, and when the release agent is supplied to the mold again, variations in the amount of supply can be suppressed.

[0037] The compact obtained in the compacting step is then heated and sintered (sintering step) to obtain an RTB based sintered magnet. [Example]

[0038] The present disclosure will be explained in more detail by way of examples, but is not limited thereto.

[0039] Examples 1 to 4, Comparative Examples 1 and 2 A release agent was prepared in the liquid holding section of the liquid supply device, and the release agent was supplied to multiple solenoid valves. After that, the multiple solenoid valves were switched, and N2 gas was supplied from the air supply source to the multiple solenoid valves via an air supply pipe that was equally branched so that the air pressure was uniform. The blow time (s) and blow pressure (MPa) at this time were set under the conditions shown in Table 1. The release agent pushed out by the N2 was then blown into the supply port of a discharge section made of resin, which was 2.5 m long and had a height difference of 0.4 m. tube The release agent was passed through a nozzle having a diameter of 0.6 mm and made of aluminum, and the amount of release agent supplied was measured.

[0040] This operation was repeated 10 times, and the difference in discharge amount R (g) was calculated by subtracting the minimum discharge amount of release agent from the maximum discharge amount.

[0041] [Table 1]

[0042] The results of Comparative Example 1 show that when the blow pressure (MPa) is 0.1 MPa or less, even if the blow time (s) is increased, the discharge rate difference R (g) becomes 0.02 or more, and the supply rate becomes unstable.

[0043] Furthermore, the results of Comparative Example 2 and Examples 2 and 3 show that even if the blow pressure (MPa) is the same, if the blow time (s) is too short, the discharge rate difference R (g) becomes 0.02 or more, and the supply rate becomes unstable.

[0044] Furthermore, as shown in Figure 4, from the results of Examples 1 to 4 and Comparative Examples 1 and 2, it was found that there is a correlation between the blow pressure (MPa) and the blow time (s) when the difference in discharge amount R (g) that can be stably supplied is less than 0.02. In other words, when the blow pressure (MPa) is x and the blow time (s) is y, it was found that by supplying the release agent so as to satisfy the formulas (1) and (2), the difference in discharge amount R (g) becomes less than 0.02 and the release agent can be stably supplied. x>0.1 (1) y≧0.29x -1 (2) [Industrial Applicability]

[0045] INDUSTRIAL APPLICABILITY The present disclosure has industrial applicability in that it can provide a liquid supply device and liquid supply method that can suppress variations in the amount of liquid supplied, and a method for producing an RTB based sintered magnet. [Explanation of symbols]

[0046] 1…Liquid supply device 2…Liquid holding part 3...Air supply section 3a...Air supply source 3b...Air supply pipe 4...Multiple solenoid valves 5...Discharge part 5a…Supply pipe 5b...Nozzle 5b1, 5b2...Plane part 5b3, 5b4...inner taper L…Liquid

Claims

1. A liquid supplying device that supplies a mold release agent from a discharge port provided in each of a plurality of solenoid valves to each of the cavities of a mold that can mold a plurality of products at a time, a liquid holding portion that holds the release agent and supplies the release agent; an air supply unit including an air supply source for supplying air, and an air supply pipe connected to the air supply source and branched equally so that the pressure of the air is uniform; The plurality of solenoid valves are connected to the liquid holding unit and the air supply pipe of the air supply unit, and switch between the release agent supplied from the liquid holding unit and the air supplied from the air supply pipe.

2. 2. The liquid supply device according to claim 1, wherein the air is supplied so as to satisfy the following formulas (1) and (2), where x is the blow pressure (MPa) of the air supplied to the solenoid valve and y is the blow time (s). －１ (2)

3. the discharge portion has a supply pipe and a nozzle, the supply pipe is made of a resin material; 3. The liquid supply device according to claim 1, wherein the nozzle is made of a metal material.

4. 4. The liquid supply device according to claim 3, wherein an end of the nozzle is formed with an inward taper.

5. 5. The liquid supply device according to claim 3, wherein the supply pipe is made of fluororesin.

6. A liquid supply device that supplies liquid from a discharge portion connected to a plurality of solenoid valves, a liquid holding portion that holds the liquid and supplies the liquid to the plurality of solenoid valves; an air supply unit including an air supply source for supplying air, and an air supply pipe connected to the air supply source and the plurality of solenoid valves, the air supply pipe being equally branched so that the pressure of the air supplied from the air supply source to the plurality of solenoid valves is uniform; the plurality of solenoid valves are connected to the liquid holding portion and the air supply portion, and switch between the liquid and the air to be supplied to the discharge portion; a liquid supplying method using a liquid supplying device, wherein the discharge units are provided in the plurality of solenoid valves, respectively, a liquid supplying step of supplying the liquid from the liquid holding portion to the plurality of solenoid valves; an air supplying step of, after the liquid supplying step, supplying the air from the air supply unit to the plurality of electromagnetic valves by switching the plurality of electromagnetic valves, pushing the liquid from the plurality of electromagnetic valves to the discharge unit, and discharging the liquid from the discharge unit; Including, In the air supplying step, the air is supplied so as to satisfy the following formulas (1) and (2), where x is the blow pressure (MPa) and y is the blow time (s). x>0.1 (1) y≧0.29x －１ (2)

7. A liquid supply device that supplies liquid from a discharge portion connected to a plurality of solenoid valves, a liquid holding portion that holds the liquid and supplies the liquid to the plurality of solenoid valves; an air supply unit including an air supply source for supplying air, and an air supply pipe connected to the air supply source and the plurality of solenoid valves, the air supply pipe being equally branched so that the pressure of the air supplied from the air supply source to the plurality of solenoid valves is uniform; the plurality of solenoid valves are connected to the liquid holding portion and the air supply portion, and switch between the liquid and the air to be supplied to the discharge portion; a method for producing an R-T-B based sintered magnet (R is at least one rare earth element and always includes at least one of Nd and Pr; T is at least one transition metal element and always includes Fe) using a liquid supply device, wherein the discharge portion is provided on each of the plurality of solenoid valves, an alloy powder preparation step of preparing an R-T-B based alloy powder; a molding step of supplying a mold release agent to a mold, and then supplying the R-T-B based alloy powder to the mold and molding it to obtain a molded body; a sintering step of heating the compact to obtain a sintered body; Including, a release agent supplying step of supplying the release agent from the liquid holding portion of the liquid supply device to the plurality of solenoid valves; an air supplying step in which, after the release agent supplying step, the air is supplied from the air supplying unit to the plurality of electromagnetic valves by switching the plurality of electromagnetic valves, the release agent is pushed out from the plurality of electromagnetic valves to the discharge unit, and the release agent is discharged from the discharge unit; is supplied to the mold by In the air supplying step, the air is supplied so as to satisfy formulas (1) and (2), where x is the blowing pressure (MPa) and y is the blowing time (s). x>0.1 (1) y≧0.29x －１ (2)

8. 8. The method for producing an R-T-B based sintered magnet according to claim 7, wherein, when the R-T-B based alloy powder is supplied to the die, the discharge part is moved to a position away from the die, and the air is supplied from the discharge part to push out any release agent remaining in the discharge part.

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