JP6865471B2 - Powder molding equipment, mold for powder molding and method for producing powder molded body - Google Patents

Description

The present invention relates to a technique for producing a powder molded body of metal, ceramics, etc. using a mold and a technique for producing a sintered body by sintering the powder molded body.

In the production of a powder molded body (hereinafter, may be simply referred to as "molded body") by the powder metallurgy method, the gold is divided into two in the horizontal direction or the horizontal direction, and the divided surface is inclined with respect to the horizontal direction. A method of molding a raw material powder using a mold has been proposed (see, for example, Patent Document 1).

Japanese Patent No. 5261833

However, when a plurality of split dies are combined to form a cavity, each split die can still be translated after the inclined surfaces forming the split faces of the split dies come into contact with each other. , At least one of the plurality of split dies may be displaced in the vertical direction by being guided by the inclined surface.

For example, as shown in FIG. 13A, a case where the mold X0 is horizontally divided into the two divided molds X1 and X2 will be considered. A pair of vertical surfaces X112 and X116 extending in the vertical direction and a pair of vertical surfaces X112 and X116 in which the division surfaces X11 of the first division mold X1 are displaced from each other in the horizontal direction and the vertical direction, respectively. It is composed of an inclined surface X114 continuous with each edge. Similarly, a pair of vertical surfaces X212 and X216 extending in the vertical direction and a pair of vertical surfaces X212 in which the division surfaces X21 of the second division mold X2 are displaced from each other in the horizontal direction and the vertical direction, respectively. And an inclined surface X214 which is continuous with each edge of X216.

In this case, when the divided dies X1 and X2 are driven laterally so as to be close to each other due to a manufacturing error of each divided die, the inclined surface X114, as shown in FIG. 13A, It is possible that the pair of vertical surfaces X112, X116 and X212, X216 are still separated from each other, although the X214s are in contact with each other. In this situation, the split molds X1 and X2 can still be driven in the same direction, so that one split mold X1 is guided to the inclined surface of the other split mold X2 as shown in FIG. 13B. It is slightly displaced upward (floating). Therefore, there is a possibility that the molding accuracy of the molded product may be unexpectedly lowered.

Therefore, the present invention provides a method capable of improving the molding accuracy of a molded product by preventing relative displacement of the divided dies in the vertical direction, which is derived from the inclined surface constituting the divided surface of each divided die. The purpose is to do.

INDUSTRIAL APPLICABILITY The present invention includes a plurality of split dies that form cavities according to the side shape of a powder molded body by abutting against each other, and a mold drive mechanism for relatively displaced the plurality of split dies. An upper punch and a lower punch inserted into the cavity formed by the plurality of split dies from the upper direction and the lower direction, respectively, and an elevating drive mechanism for raising and lowering each of the upper punch and the lower punch. Each of the plurality of divided dies is connected to an inclined surface inclined with respect to the displacement direction and the upper edge and the lower edge of the inclined surface, respectively, and is perpendicular to the displacement direction. The present invention relates to a powder molding apparatus having a vertical surface, a divided surface having a vertical surface, and a molding surface defining the cavity.

Powder molding apparatus of the present invention, each of the plurality of divided mold, the predetermined surface is formed by at least one parallel surface parallel to the inclined plane and displacement direction which is inclined with respect to the displacement direction And a split surface having a pair of vertical surfaces connected to each of the upper edge and the lower edge of the predetermined surface and perpendicular to the displacement direction, and a molding surface defining the cavity. In a powder molding apparatus, each of the plurality of division dies abuts on each other on the pair of vertical surfaces of the division surfaces, while each other at intervals included in the range of 1 to 30 μm on the predetermined surface. It is characterized in that the cavity is formed by abutting each other in a separated state.

According to the powder molding apparatus having this configuration, when the cavity is formed, the pair of vertical surfaces forming the division surface of each division mold come into contact with each other. On the other hand, the predetermined surfaces constituting the division surface of each division mold are separated from each other with a gap. For this reason, it is possible to reliably avoid a situation in which a plurality of split dies are driven so as to be relatively displaced while being in contact with each other on a predetermined surface constituting the split surface. Further, the gap between the predetermined surfaces is included in the range of 1 to 30 μm, and the situation where the raw material powder having an average particle size equal to or larger than the gap protrudes from the cavity into the gap is suppressed. As a result, relative displacement (positional deviation) in the vertical direction of the plurality of split dies due to the appearance of the situation is surely prevented, and the molding accuracy of the cavity and the shape accuracy of the powder molded body are improved. Improvement is planned.

For the same reason as in the method for producing a powder molded body of the present invention and the mold of the present invention having a plurality of divided dies, the shape accuracy of the powder molded body can be improved.

In the powder molding apparatus of the present invention, the powder molding apparatus further includes a gas supply device, and at least one of the plurality of split dies divides the gas supplied from the gas supply device. It is preferable to have a ventilation path for supplying to the outside of the at least one split mold through the opening of the surface.

According to the powder molding apparatus having this configuration, gas is supplied to the gaps between the divided surfaces in a state where each of the plurality of divided dies is separated from each other on the pair of vertical surfaces constituting the divided surfaces. sell. Therefore, the raw material powder or dust existing in the gaps between the vertical surfaces constituting the divided surfaces are removed by the air flow, and the vertical surfaces can be reliably brought into contact with each other without being caught by the raw material powders. As a result, the molding accuracy of the cavity and, by extension, the shape accuracy of the powder molded product can be further improved. In addition, gas can be supplied to the gaps between the predetermined surfaces forming each of the divided surfaces of the plurality of divided molds. Therefore, the raw material powder existing in the gap between the predetermined surfaces constituting the divided surface is removed by the air flow. As a result, the shape accuracy of the powder molded body can be further improved while reducing the work load for removing the burrs derived from the raw material powder existing in the gaps between the predetermined surfaces from the powder molded body or the sintered body.

In the powder molding apparatus of the present invention, it is preferable that the opening of the air passage is provided on the predetermined surface constituting the divided surface.

According to the powder molding apparatus having the above configuration, in a state where each of the plurality of dividing dies is in contact with each other on a pair of vertical surfaces forming the dividing surface, with respect to a gap between predetermined surfaces forming the dividing surface. Gas is supplied. Therefore, after the cavity is formed by the plurality of divided dies coming into contact with each other, the raw material powder protruding from the cavity into the gap is removed by the air flow. As a result, the shape accuracy of the powder molded body can be further improved while reducing the work load for removing the burrs derived from the protruding raw material powder from the powder molded body or the sintered body.

In the powder molding apparatus of the present invention, the molding surface of each of the plurality of divided dies includes an opposite surface that intersects the reference horizontal plane at an obtuse angle and a forward surface that intersects the reference horizontal plane at an acute angle. , The powder molding such that at least a part of the boundary between the opposite surface and the forward surface and the surface adjacent to the at least one surface is inclined with respect to the reference horizontal plane. The predetermined surface having a shape corresponding to the side surface shape of the body and forming the divided surface of the plurality of divided dies extends along the boundary portion of the powder molded body. Is preferable.

The explanatory view about the structure of the powder molding apparatus as the 1st Embodiment of this invention. Explanatory drawing about the structure of the mold as the 1st Embodiment of this invention. The explanatory view about the function of the mold as the 1st Embodiment of this invention. The explanatory view about the 1st stage of the manufacturing method (1st Embodiment) of a powder molded article. The explanatory view about the 2nd stage of the manufacturing method (1st Embodiment) of a powder compact. The explanatory view about the 3rd stage of the manufacturing method (1st Embodiment) of a powder compact. The explanatory view about the 4th stage of the manufacturing method (1st Embodiment) of a powder compact. The explanatory view about the 5th stage of the manufacturing method (1st Embodiment) of a powder molded article. The explanatory view about the structure of the powder molding apparatus as the 2nd Embodiment of this invention. Explanatory drawing about the structure of the mold as the 2nd Embodiment of this invention. The explanatory view about the function of the mold as the 2nd Embodiment of this invention. The explanatory view about the function of the mold as the 2nd Embodiment of this invention. The explanatory view about the 1st stage of the manufacturing method (2nd Embodiment) of a powder molded article. Explanatory drawing which concerns on the 2nd stage of the manufacturing method (2nd Embodiment) of a powder molded article. The explanatory view about the 3rd stage of the manufacturing method (2nd Embodiment) of a powder compact. The explanatory view about the 4th stage of the manufacturing method (2nd Embodiment) of a powder molded article. The explanatory view about the 5th stage of the manufacturing method (2nd Embodiment) of a powder compact. A perspective view of a powder molded product as an example. Top view of a powder molded product as an example. A side view of a powder molded article as an example. The explanatory view about the structure of the mold as the modification embodiment of the 1st Embodiment of this invention. The explanatory view about the structure of the mold as the modification embodiment of the 1st Embodiment of this invention. Explanatory drawing about the structure of the mold as another embodiment of this invention. Explanatory drawing about the structure of the mold in the prior art. Explanatory drawing about the function of the mold in the prior art.

(Composition of powder molded product)
The molded body 40 manufactured by the powder molded body manufacturing method as one embodiment of the present invention is exemplified in FIGS. 9A to 9C. The side surface 42 includes a reverse surface 421 that intersects the reference horizontal plane (horizontal region of the upper surface 41) at an obtuse angle and a forward surface 422 that intersects the reference horizontal plane at an acute angle. At least a part of the boundary portion 44 between at least one surface of the reverse surface 421 and the forward surface 422 and the surface adjacent to at least one surface is inclined with respect to the reference horizontal plane.

(Mold configuration)
(First Embodiment)
FIG. 2 shows a mold 10 as a first embodiment of the present invention, which is used for producing the powder molded product 40 shown in FIGS. 9A to 9C or the powder molded product as a base thereof . Mold 10 is made of the first split mold 11 and the second split mold 12 having a shape as if the die 10 is divided transversely or horizontally.

The first divided mold 11 has a pair of divided surfaces 111 and a molding surface 112. The split surface 111 is deviated from each other in the displacement direction (horizontal direction) and the vertical direction of the first split mold 11, and is a pair of vertical planes 1112 and 1116 perpendicular to the horizontal direction, and one vertical plane. It is composed of an inclined surface 1114 (predetermined surface) that is inclined in the horizontal direction so as to be continuous with each of 1112 and the other vertical surface 1116. The molding surface 112 has a shape corresponding to the shape of a part (for example, the right portion) of the side surface 42 of the powder molded body 40.

The second split mold 12 has a pair of split surfaces 121 and a molding surface 122. The split surface 121 is a pair of vertical planes 1212 and 1216 that are displaced in the displacement direction (horizontal direction) and the vertical direction of the second split mold 12 and are perpendicular to the horizontal direction, and one vertical plane. It is composed of an inclined surface 1214 (predetermined surface) that is inclined in the horizontal direction so as to be continuous with each of the 1212 and the other vertical surface 1216. The molding surface 122 has a shape corresponding to the shape of the remaining portion (for example, the left portion) of the side surface 42 of the powder molded body 40.

As shown in FIG. 3, each of the first divided mold 11 and the second divided mold 12 abuts on each other on the pair of vertical surfaces 1112, 1116, 1212, 1216 of the divided surfaces 111 and 121. On the other hand, the inclined surfaces 1114 and 1214 are separated from each other with an interval d included in the range of 1 to 30 μm. The interval d may change, such as gradually widening and then gradually narrowing along the predetermined surfaces 1114 and 1214, or may be constant. Each of the inclined surfaces 1114 and 1214 extends along each of the two boundary portions 44 of the boundary portions 44 on the side surface 42 of the powder compact 40. In such a state, the first divided mold 11 and the second divided mold 12 are in contact with each other to form a cavity 100 having a shape corresponding to the shape of the side surface 42 of the powder molded body 40. ing.

(Second Embodiment)
A mold 10 as a second embodiment of the present invention used for producing the powder molded product 40 shown in FIGS. 9A to 9C is shown in FIG . The mold 10 is composed of a first divided mold 11 and a second divided mold 12 having a shape as if the mold 10 was divided in the vertical direction.

The first division mold 11 has four division surfaces 111 arranged so as to form four sides of a rectangle, and a molding surface 112. The dividing surface 111 is deviated from each of the displacement direction (vertical direction) and the horizontal direction of the first dividing mold 11, and is a pair of vertical surfaces 1112 and 1116 perpendicular to the vertical direction, and one vertical surface. Vertically inclined so as to be continuous with each of 1112 and the other vertical surface 1116, and vertically so as to be continuous with each of the vertical surface 1116 and the vertical surface 1112 of the adjacent dividing surface 111. It is composed of an inclined surface 1118 which is inclined in a direction. The molding surface 112 has a shape corresponding to the shape of a part (for example, the upper part) of the side surface 42 of the powder molded body 40.

The second division mold 12 has four division surfaces 121 arranged so as to form four sides of a rectangle, and a molding surface 122. The split surface 121 is deviated from each of the displacement direction (vertical direction) and the horizontal direction of the second split mold 12, and is a pair of vertical planes 1212 and 1216 perpendicular to the vertical direction, and one vertical plane. Vertically inclined so as to be continuous with 1212 and the other vertical surface 1216, respectively, and vertically inclined so as to be continuous with the vertical surface 1216 and the vertical surface 1212 of the adjacent dividing surface 121. It is composed of an inclined surface 1218 that is inclined in the direction. The molding surface 122 has a shape corresponding to the shape of the remaining portion (for example, the lower portion) of the side surface 42 of the powder molded body 40.

As shown in FIG. 7, each of the first divided mold 11 and the second divided mold 12 abuts on each other on the pair of vertical surfaces 1112, 1116, 1212, 1216 of the divided surfaces 111 and 121. .. On the other hand, the inclined surfaces 1114 and 1214 and the inclined surfaces 1118 and 1218 are separated from each other at intervals d1 and d2 included in the range of 1 to 30 μm, respectively. The interval d1 may change, such as gradually widening and then gradually narrowing along the predetermined surfaces 1114 and 1214, or may be constant. Similarly, the interval d2 may change or be constant, such as gradually widening and then gradually narrowing along the predetermined surfaces 1118 and 1218. Each of the inclined surfaces 1114, 1118, 1214 and 1218 extends along each of the four boundary portions 44 of the boundary portions 44 on the side surface 42 of the powder compact 40. In such a state, the first divided mold 11 and the second divided mold 12 are in contact with each other to form a cavity 100 having a shape corresponding to the shape of the side surface 42 of the powder molded body 40. ing.

(Structure of powder molding equipment)
(First Embodiment)
The powder molding apparatus as the first embodiment of the present invention shown in FIG. 1 includes a mold 10 as the first embodiment of the present invention shown in FIG. The powder molding apparatus includes a first mold drive mechanism 110 and a second mold drive mechanism 120 for horizontally displace each of the first division mold 11 and the second division mold 11, and the first division mold 11. In order to raise and lower the upper punch 21 and the lower punch 22 and the upper punch 21 and the lower punch 21 which are inserted from the upper direction and the lower direction into the cavity formed by the contact of the second divided die 12 respectively. The first elevating drive mechanism 21'and the second elevating drive mechanism 22'are further provided.

The upper punch 21 is formed with a receiving space 210 that opens at its tip (lower end) and extends upward along its central axis from the opening. The lower punch 22 has a through hole that opens at the tip (upper end) of the lower punch 22 and extends downward along the central axis from the opening, and the rod 220 is axially oriented with respect to the lower punch 22. It is inserted through the through hole in a form that allows relative movement. An elevating drive mechanism for raising and lowering the rod 220 may be provided (not shown).

(Second Embodiment)
The powder molding apparatus as the second embodiment of the present invention shown in FIG. 5 vertically holds the mold 10 as the second embodiment of the present invention and the first divided mold 11 shown in FIG. A mold drive mechanism 110 for displacing in the direction is provided. Since other configurations are almost the same as those of the powder molding apparatus of the first embodiment, the same reference numerals are used and the description thereof will be omitted.

(Method for producing powder molded product)
(First Embodiment)
In the method for producing powder molding as the first embodiment of the present invention, the powder molding apparatus as the first embodiment of the present invention is used (see FIGS. 1 to 3).

First, each of the first split mold 11 and the second split mold 12 is translated and driven so as to approach each other by the first mold drive mechanism 110 and the second mold drive mechanism 120, respectively. Then, the first divided mold 11 and the second divided mold 12 are in contact with each other, and the sides of the cavity 100 are defined by the molding surfaces 112 and 122 (see FIG. 4A). The lower punch 22 is driven up by the second elevating drive mechanism 220 and inserted into the cavity 100. At this time, the rod 220 protrudes upward from the tip of the lower punch 22. The timing at which the lateral and lower punches of the cavity 100 are inserted may be reversed in chronological order or may be simultaneous.

In this state, the raw material powder P is charged into the cavity 100 by, for example, a powder supply device (not shown), and is filled in the cavity 100 so as to surround the rod 220 (see FIG. 4A). Subsequently, the upper punch 21 is driven downward by the first elevating drive mechanism 210, inserted into the cavity 100, and moved to a predetermined position before pressurization (see FIG. 4B). At this time, the rod 220 is inserted into the receiving space 210 of the upper punch 21. After that, the raw material powder P is pressure-molded by driving at least one of the upper punch 21 and the lower punch 22 so that the upper punch 21 and the lower punch 22 come closer to each other (see FIG. 4C). .. Next, each of the first split mold 11 and the second split mold 12 is translated and driven so as to be separated from each other (see FIG. 4D). The upper punch 21 may be driven up first before the first split die 11 and the second split die 12 are separated from each other. Then, both the upper punch 21 and the lower punch 22 are driven upward, and the rod 220 is driven downward relative to the lower punch 22, so that the powder molded body 40 is taken out from the cavity 100 (see FIG. 4E). Alternatively, from the state of FIG. 4D, a vertical drive mechanism is provided on the plate to which the first divided mold 11 and the second divided mold 12 are attached, and the first divided mold 11 and the second divided mold 12 are driven downward. You may.

(Second Embodiment)
In the method for producing a powder molded product as the second embodiment of the present invention, the powder molding apparatus as the second embodiment of the present invention is used (see FIGS. 5 to 7).

First, the first split mold 11 is driven downward by the mold drive mechanism 110 so as to approach each other with the second split mold 12. Then, the first split mold 11 and the second split mold 12 are in contact with each other, and the sides of the cavity 100 are defined by the molding surfaces 112 and 122 (see FIG. 8A). The lower punch 22 is driven up by the second elevating drive mechanism 220 and inserted into the cavity 100. At this time, the rod 220 protrudes upward from the tip of the lower punch 22. The timing at which the side of the cavity 100 and the lower punch 22 are inserted may be reversed in time series or at the same time.

In this state, the raw material powder P is charged into the cavity 100 by, for example, a powder supply device (not shown), and is filled in the cavity 100 so as to surround the rod 220 (see FIG. 8A). Subsequently, the upper punch 21 is driven downward by the first elevating drive mechanism 210, inserted into the cavity 100, and moved to a predetermined position before pressurization (see FIG. 8B). At this time, the rod 220 is inserted into the receiving space 210 of the upper punch 21. After that, the raw material powder P is pressure-molded by driving at least one of the upper punch 21 and the lower punch 22 so that the upper punch 21 and the lower punch 22 come closer to each other (see FIG. 8C). .. Next, the first split mold 11 is driven up so that the first split mold 11 and the second split mold 12 are separated from each other (see FIG. 8D). The upper punch 21 may be driven up first before the first split die 11 and the second split die 12 are separated from each other. Then, both the upper punch 21 and the lower punch 22 are driven upward, and the rod 220 is driven downward relative to the lower punch 22, so that the powder compact is taken out from the cavity 100 (see FIG. 8E). Alternatively, from the state of FIG. 8D, a vertical drive mechanism may be provided on the plate to which the second split mold 12 is attached, and the second split mold 12 may be driven downward.

(Other Embodiments of the present invention)
The powder molding apparatus further includes a gas supply device (not shown), and at least one of the plurality of split dies 11 and 12 allows the gas supplied from the gas supply device to pass through the opening of the split surface. It may have a ventilation path for supplying to the outside of the at least one split mold. For example, according to the mold 10 as a modified embodiment of the first embodiment of the present invention shown in FIG. 10, the first divided mold 11 and the first divided mold 11 from one opening 104 to the other opening 106. A ventilation passage 102 extending inside each of the two-divided molds 12 is provided. One opening 104 is provided at a position (for example, an upper surface) other than the divided surfaces 111 and 121 and the molded surfaces 112 and 122 of the divided molds 11 and 12, and is connected to the ventilation path of the gas supply device. The other opening 106 is provided on the divided surfaces 111, 121, more specifically, the inclined surfaces 1114, 1214 of each of the divided molds 11, 12.

According to the powder molding apparatus having the above configuration, the plurality of divided dies 21 and 22 are ventilated in a state where they are separated from each other on the vertical surfaces 1112, 1116, 1212 and 1216 constituting the divided surfaces 111 and 121. Gas can be supplied to the gap between the divided surfaces 111 and 121 through the path 102. Therefore, the vertical surfaces 1112 and 1212 forming the divided surfaces 111 and 121, and the raw material powder or dust existing in the gaps between the 1116 and 1216 are removed by the air flow, and the vertical surfaces 1112 and 1212 and the 1116 and 1116 are removed. The 1216s can be reliably brought into contact with each other without being bitten by the raw material powder. As a result, the molding accuracy of the cavity 100 and, by extension, the shape accuracy of the powder molded body 40 can be further improved. Further, gas can be supplied through the air passage 102 to the gap between the inclined surfaces 1114 and 1214 forming the divided surfaces 111 and 121 of the plurality of divided molds 11 and 12, respectively. Therefore, the raw material powder existing in the gap between the inclined surfaces 1114 and 1214 constituting the divided surfaces 111 and 121 is removed by the air flow. As a result, the work load for removing burrs derived from the raw material powder existing in the gaps between the inclined surfaces 1114 and 1214 from the powder molded body 40 or the sintered body is reduced, and the powder molded body 40 (and thus the sintered body) is reduced. ) Further improvement of shape accuracy is achieved.

In a state where each of the plurality of dividing dies 11 and 12 are in contact with each other on the vertical surfaces 1112, 1116, 1212 and 1216 forming the dividing surfaces 111 and 121, the inclined surfaces 1114 and the inclined surfaces 1114 forming the dividing surfaces 111 and 121 and the divided surfaces 111 and 121 are in contact with each other. Gas is supplied to the gaps between the 1214s (see FIGS. 3 and 7). Therefore, after the cavity 100 is formed by the plurality of divided dies 11 and 12 coming into contact with each other, the raw material powder protruding from the cavity 100 into the gap is removed by the air flow. As a result, while reducing the workload for removing the burrs derived from the protruding raw material powder from the powder molded body P1 or the powder molded body 40, the shape accuracy of the powder molded body P1 and thus the powder molded body 40 can be further improved. It is planned.

In the modified embodiment, the air passage 102 may be formed in addition to or in place of the inclined surfaces 1114, 1214 so that the vertical surfaces 1112, 1116, 1212, 1216 have the other opening 106. Design items such as the extension mode (shape) of the ventilation passage 102, the number, shape and size of the ventilation passages 104 and 106 may be arbitrarily changed.

In the above embodiment, the predetermined surface is composed of an inclined surface whose predetermined surface is inclined with respect to the horizontal direction, but as another embodiment, the predetermined surface is parallel to the horizontal direction in place of or in addition to the inclined surface. It may be composed of parallel planes. For example, as shown in FIG. 11, the predetermined surfaces 1114 and 1214 of the divided surfaces 111 and 121 of the divided molds 11 and 12 are a parallel surface and a curved surface or a convex curved surface (relative to the horizontal direction) continuous to both edges thereof. It may be composed of an inclined surface whose inclination angle is not constant).

In the above embodiment, the predetermined surface is composed of an inclined surface that is inclined at a constant angle with respect to the horizontal direction, but in another embodiment, the predetermined surface is a curved surface, a bent surface, a convex curved surface, or a concave curved surface. It may be composed of an inclined surface whose inclination angle with respect to the horizontal direction is not constant.

In the above embodiment, the mold is divided into two divided molds, but as another embodiment, the mold may be divided into a plurality of divided molds of 3 or more. For example, as shown in FIG. 12, the mold 10 may be composed of four divided molds 31 to 34. In each of the divided molds 31 to 34, each component having a reference numeral of "3X ..." (X = 1, 2, 3, 4) is "1Y ..." (Y = 1, 2, 4) in the above embodiment. ) Corresponds to each component of the divided dies 11 and 12, so further description will be omitted.

10 ... Mold, 11 ... 1st split mold, 12 ... 2nd split mold, 21 ... Upper punch, 22 ... Lower punch, 31 ... Split mold, 32 ... Split mold, 33 ... Split mold, 34 Divided mold, 40 powder molded body, 41 upper surface, 42 side surface, 43 lower surface, 44 boundary part, 100 cavity, 102 air passage, 104 opening, 110 first mold drive mechanism , 120 ... Second mold drive mechanism, 111, 121 ... Divided surface, 112, 122 ... Molding surface, 210 ... First elevating drive mechanism, 220 ... Second elevating drive mechanism, 421 ... Reverse surface, 422 ... Forward surface, 1112: Vertical surface, 1114: Predetermined surface (inclined surface, parallel surface), 1116: Vertical surface, 1118: Predetermined surface (inclined surface), 1212: Vertical surface, 1214: Predetermined surface (inclined surface, parallel surface), 1216: Vertical surface, 1218 ... Predetermined surface (inclined surface), P ... Raw material powder.

Claims (6)

A plurality of split dies that form cavities according to the side shape of the powder molded body by abutting against each other, a mold drive mechanism for relatively displace the plurality of split dies, and the plurality of split dies. An upper punch and a lower punch that are inserted into the cavity formed by the mold from above and below, respectively, and an elevating drive mechanism for raising and lowering each of the upper punch and the lower punch are provided.
Each of the plurality of division molds has a predetermined surface composed of at least one of an inclined surface inclined with respect to the displacement direction and a parallel surface parallel to the displacement direction, and an upper edge of the predetermined surface. A powder molding apparatus having a divided surface having a pair of vertical surfaces connected to each of the lower edge and perpendicular to the displacement direction, and a molding surface defining the cavity.
Each of the plurality of split dies abuts on the pair of vertical planes of the split plane, while they are in contact with each other in a state of being separated from each other at intervals included in the range of 1 to 30 μm on the predetermined plane. A powder molding apparatus characterized in that the cavity is formed by contacting the cavity. In the powder molding apparatus according to claim 1,
The powder molding apparatus further includes a gas supply apparatus.
A ventilation path for at least one of the plurality of dividing dies to supply the gas supplied from the gas supply device to the outside of the at least one dividing die through an opening of the dividing surface. A powder molding apparatus characterized by having. In the powder molding apparatus according to claim 2,
A powder molding apparatus characterized in that the opening of the air passage is provided on the predetermined surface constituting the divided surface. In the powder molding apparatus according to any one of claims 1 to 3,
Each of the molding surfaces of the plurality of divided dies includes a reverse surface that intersects the reference horizontal plane at an obtuse angle and a forward surface that intersects the reference horizontal plane at an acute angle, and the reverse surface and the forward surface. A shape corresponding to the side surface shape of the powder molded product such that at least a part of the boundary portion between at least one surface and the surface adjacent to the at least one surface is inclined with respect to the reference horizontal plane. And
A powder molding apparatus, wherein the predetermined surface constituting the divided surface of the plurality of divided dies extends along the boundary portion of the powder molded body. A method for producing a powder molded body, which manufactures a powder molded body using a plurality of divided dies that form cavities according to the side shape of the powder molded body by being relatively displaced and abutting against each other.
Each of the plurality of division molds has a predetermined surface composed of at least one of an inclined surface inclined with respect to the displacement direction and a parallel surface parallel to the displacement direction, and an upper edge of the predetermined surface. And a split surface having a pair of vertical surfaces connected to each of the lower edges and perpendicular to the displacement direction, and a molding surface defining the cavity.
Each of the plurality of split dies abuts on the pair of vertical planes of the split planes, while they are in contact with each other in a state of being separated from each other at intervals included in the range of 1 to 30 μm on the predetermined planes. A method for producing a powder molded product, which is configured to form the cavity by contacting the cavity. It is provided with a plurality of split dies that form cavities according to the side shape of the powder molded body or sintered body by being relatively displaced and abutting against each other.
Each of the plurality of divided molds has a predetermined surface composed of at least one of an inclined surface inclined with respect to the displacement direction and a parallel surface parallel to the displacement direction, and an upper edge of the predetermined surface. A mold having a split surface having a pair of vertical surfaces connected to each of the lower edge and perpendicular to the displacement direction, and a molding surface defining the cavity.
Each of the plurality of split dies abuts on the pair of vertical planes of the split plane, while they are in contact with each other in a state of being separated from each other at intervals included in the range of 1 to 30 μm on the predetermined plane. A mold characterized in that the cavity is formed by contacting the mold.

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