JP5412058B2 - Powder molding equipment - Google Patents

Description

  The present invention relates to a powder molding apparatus suitable for compressing a raw material powder into a predetermined shape, and in particular, after compressing the powder by a split die configuration that can be expanded, cracks on the surface of the molded body due to friction during extrusion, etc. The present invention relates to a powder molding apparatus that prevents the occurrence of scratches.

13 (a) and 13 (b) show a powder molding apparatus disclosed in Patent Document 1. FIG. This device is characterized by a split die 14 that is divided into three in the radial direction, a die holder 18 that holds the split die 14 in a closed state and a state in which the split die 14 can be expanded, and the split die 14 is raised and expanded. A die base 12 that switches to a state in which the cutting can be performed, an upper punch 20 and a lower punch 15, and sintering filled in a cavity C defined by a die hole and a lower punch formed with the divided die 14 closed. After the powder H is compressed by the relative movement of the die holder 18 and the upper and lower punches (in this example, the lowering of the upper punch 20), the molded body is pushed out above the split die with the split die 14 in a state where the split die 14 can be expanded. . Another feature is that the suction passage 18m provided so as to cover the divided portion (the boundary between the die portions) of the divided die 14 and the passage 18m provided in the die holder 18 communicate with the passage 18m. It has a passage 18y and a pressure fluctuation means (not shown) that makes the inside of the passage a negative pressure, and allows the powder that has entered the gap between the split dies to be removed through the passage and the pressure fluctuation means.
Japanese Patent No. 3433683

  In the powder molding apparatus having the above-described split die configuration, the powder filled in the cavity is compressed by the relative movement of the die holder and the upper and lower punches, and then the molded body is pushed out above the split die in a state where the split die can be expanded. Therefore, it is possible to efficiently prevent the occurrence of cracks and scratches on the surface of the molded body due to friction during extrusion, but it is complicated and lacks versatility. That is, in this apparatus structure, even if the passage and the pressure fluctuation means are omitted, the die is expensive because the split die is vertically longer than the die holder, and the versatility to the design change of the molded body shape is lacking. It becomes difficult to maintain accuracy. SUMMARY OF THE INVENTION An object of the present invention is to provide a structure having excellent versatility with respect to design changes and the like in a powder molding apparatus having a divided die configuration, particularly by suppressing die production costs.

In order to achieve the above object, the present invention includes a split die that is split in the radial direction, a die holder that holds the split die in a closed state and a state in which the split die can be expanded, and an upper and lower punch. The raw powder filled in the cavity defined by the die hole and the lower punch formed in a closed state or the core rod disposed in the die hole is compressed by the relative movement of the upper and lower punches. In the powder molding apparatus, the die holder has a main body that forms a holding hole penetrating vertically, an outer diameter that fits into the holding hole, and a step portion that is one step larger in diameter. A split holder that forms an inner diameter for fitting the split die, is split in the radial direction, and a switching unit that switches the split holder to a closed tightening mode and a non-tightening mode in which expansion is possible. Have Split holder holds the state of closing the split die in a manner the tightening, and the holds the split die in a state capable expansion is in a non-clamping manner, in the expansion is ready It is characterized in that the split dies can be exchanged with the stepped portion .

  In the present invention described above, “compress by the relative motion of the upper and lower punches” includes any one of the one-pressing method, the double-pressing method, the floating die method, and the withdrawal method as the compression method, that is, all known compression methods. Meaning. For this reason, as a compression method, an appropriate method is employable, without being restrict | limited to the method shown to each form.

The present invention is more preferably embodied as follows.
(A) according to claim 1, wherein the die holder is held in base over scan support plate, the lower punch is held on the lower punch support plate, the divided holder is held in divided holder supporting plate, the upper punch upper punch The lower punch support plate, the split holder support plate, and the upper punch support plate can be moved up and down relatively with respect to the base support plate.
(A) In Claim 1, the switching means is formed in a taper that increases in diameter as the outer peripheral surface of the split holder and the inner peripheral surface of the holding hole go upward, and the split holder is movablely supported. It is the structure which becomes the said non-tightening aspect by raising through a board, and becomes the said fastening aspect by descending | lowering (Claim 3).
(C) In Claim 3, the divided die is configured such that the boundary between the die parts is shifted from the boundary between the holder parts by a predetermined dimension with respect to the divided holder (Claim 4).

  According to the first aspect of the present invention, in the powder molding apparatus having a split die configuration, the die holder has a main body with a holding hole, an outer diameter that fits into the holding hole, and an inner diameter that fits the split die, and is divided in the radial direction. Since it is composed of a split holder, the entire size of the split die is suppressed as shown in the examples of FIG. 1 and FIG. 10, and it is excellent in versatility and easy to maintain die accuracy. For example, when the split die is worn or molded Changing the shape of the body can be dealt with by exchanging only the divided dies at a minimum cost. Further, the split holder holds the split die in a closed state in a tightening manner closed via the switching means, and holds the split die in a state in which the split die can be expanded in a non-tightening manner capable of being expanded. The split die can be switched between a state where the split die is efficiently closed and a state where the split die can be expanded.

In the invention of claim 2, the die holder is held by the base support plate, the lower punch is held by the lower punch support plate, the split holder is held by the split holder support plate, and the upper punch is held by the upper punch support plate. In this point, the lower punch support plate, the split holder support plate, and the upper punch support plate can be moved up and down relatively with respect to the base support plate.

In the invention of claim 3, the switching means is simplified by a taper configuration as a fitting mode of the outer peripheral surface of the split holder and the inner peripheral surface of the holder body side holding hole, and a configuration in which the split holder is lifted through the support plate. Moreover, it becomes possible to implement with high accuracy.

  In the invention of claim 4, when the boundary between the die parts is arranged so as to deviate from the boundary between the holder parts by a predetermined dimension with respect to the divided holder, the powder temporarily enters the boundary (that is, the gap) between the die parts. However, since the outer peripheral side of the boundary is covered with the inner periphery of the holder part, the possibility of falling from the boundary (that is, the gap) between the holder parts can be eliminated.

  Hereinafter, the first embodiment shown in FIGS. 1 to 8 to which the present invention is applied and the second embodiment shown in FIGS. 9 to 12 will be described. The first form is an example in which the compact (green compact) is cylindrical, and the second form is an example in which the compact (compact) is columnar. In each embodiment, a press drive mechanism is omitted, but a known mechanism such as a hydraulic press is appropriately used.

(First Form) This powder molding apparatus 1 includes a split die 2, a die holder 3 that holds the split die 2 in a closed state and a state in which the split die 2 can be expanded, an upper punch 4, a lower punch 5, and a split die 2. A core hole 6 disposed in the center of the die, and a raw material powder H filled in a cavity C defined by the die hole 2a and the lower punch 5 and the core rod 6 formed with the divided die 2 closed, 3 and the upper and lower punches 4 and 5 are compressed by relative motion, and are devised in the following points as compared with the conventional apparatus. That is, the die holder 3 includes a switching holder (8a, 7a, 15) that switches between the split holder 7, the main body 8 that holds the split holder 7, and the tightening mode in which the split holder 7 is closed and the non-tightening mode in which the split holder 7 can be expanded. The split holder 7 holds the split die 2 in a closed state in the tightening manner, and holds the split die 2 in a state in which the split die 2 can be expanded in the non-tightening manner. The switching means (8a, 7a, 15) sets the outer peripheral surface 7a of the split holder 7 and the inner peripheral surface of the holder main body side holding hole 8a to taper fitting, and the split holder 7 is attached to the split holder support plate 15. It is the composition which goes up and down via.

Here, the press structure of the powder molding apparatus 1 includes a base support plate 10 that holds the core rod 6 from the bottom to the top and that holds the die holder 3 connected by a plurality of guide rods 11, and the die holder 3. The lower punch support plate 13 that holds the lower punch 5 relative to the lower punch, the split holder support plate 15 that holds the split holder 7 so as to be liftable, and the split die 2 that holds the split holder 7 And an upper punch support plate 17 holding the upper punch 4 so as to be movable up and down . Lower punch support plate 13 and the divided holder supporting plate 15 is assembled in a comb-feed state via the corresponding through-holes for each guide rod 11, are arranged above and below a horizontal state.

In other words, the upper punch 4 is a cylindrical example and is fixedly supported by the upper punch presser plate 18 with respect to the upper punch support plate 17 and can be lifted and lowered through the upper punch support plate 17 as in the conventional case. . The split holder 7 is restrained and supported by a chuck 16 such as a collect chuck attached to the split holder support plate 15 and can be moved up and down by a predetermined dimension via a split holder support plate 15 by a hydraulic device (not shown). ing. The lower punch 5 has a cylindrical shape and is fixedly supported by the lower punch presser 14 with respect to the lower punch support plate 13 and from the through hole provided in the split holder support plate 15 and the inner diameter of the split holder 7 to the split die 2 side. It protrudes and can be moved up and down by a hydraulic device (not shown) through the lower punch support plate 15. Core rod 6, with respect to the base supporting lifting plate 10 is fixedly supported by the rod pressing 12 is protruded from the inner diameter of the through hole and the lower punch 6 provided on the lower punch support plate 13 to the divided die 2 side.

  The division | segmentation die | dye 2 is an example equally divided into four as FIG. 1 and FIG. 3 shows, and is divided | segmented as die | dye part 2A-2D in a cylindrical radial direction. Each die part 2A-2D is hold | maintained so that switching to the state which closed the division die 2 via the division holder 7 of the die holder 3 and the state which can be expanded is possible. That is, the state in which the divided die 2 is closed is a state at the time of powder filling and compression molding in which the die portions 2A to 2D are constrained without gaps to form regular die holes 2a. The state in which expansion is possible means that when each die part 2A to 2D receives outward stress from the inside, the constraint is released and a minute gap is formed between the die parts. It is an unrestrained state when extruding from the die hole 2a. In addition, it is preferable that the division | segmentation die | dye 2 is divided | segmented into 3 or more in order to obtain the said unrestrained state stably and uniformly.

  Of the die holder 3, the split holder 7 is an example of four equal parts, similar to the split die 2, and is divided into holder portions 7 </ b> A to 7 </ b> D in a substantially cylindrical radial direction. In the tightening mode in which the divided holder 7 is closed as shown in FIG. 3A, the outer peripheral surface 7a of each of the holder portions 7A to 7D has a taper that is gradually inclined outward, that is, increases in diameter as the upper side goes upward. The lower side is a vertical surface having the same diameter. In addition, as the inner diameter of each of the holder portions 7A to 7D, the upper inner peripheral surface is provided with a stepped portion 7b having a one-step larger diameter for arranging the die portions 2A to 2D. The lower inner peripheral surface is formed corresponding to the lower punch 5. Further, on the lower vertical surface, an engaging groove 7c for chuck is provided on the lower end side.

  The main body 8 includes a substantially central holding hole 8a for supporting the divided die 2, engaging groove portions 8b and 8c provided on the upper and lower surfaces of the outer periphery, and a ring-shaped die outer peripheral portion 9 integrated on the outer periphery. And have. The holding hole 8a is a taper that gradually increases in diameter as the inner periphery goes on the same as the outer peripheral surface 7a on the upper side of the split holder. When the split holder 7 is inserted from above in a closed state, Become. The die outer peripheral portion 9 has an engaging groove portion whose inner periphery faces the engaging groove portion 8 b and an inner diameter portion that engages with the engaging groove portion 8 c, and the inner diameter portion is engaged with the engaging groove portion 8 c with respect to the outer periphery of the main body 8. The coupling member 19 is integrated by being engaged across the engaging groove portions. The die outer peripheral portion 9 constitutes a die table together with the die holder 8 holding the die body 8 and the divided die 2. Further, the upper end of the guide rod 11 is connected to the die outer peripheral portion 9.

  The above split holder 7 and split die 2 are assembled into the main body 8 by the following procedure example. For example, the split holder 7 is inserted into the main body side holding hole 8a downward in a state where the holder portions 7A to 7D are arranged in a cylindrical shape, and then the holder portion is attached to the chuck 16 provided on the split holder support plate 15. The lower end side is held. The chuck 16 always holds the lower sides of the holder portions 7A to 7D, and when the divided holder support plate 15 is raised from the lower limit position of FIG. 1 as shown in FIG. 5, the holder portions 7A to 7D are held. What is necessary is just a structure which hold | maintains in the non-tightening aspect which can be expanded, and hold | maintains each holder part 7A-7D in the closed tightening aspect, when it descend | falls to the lower limit position of FIG.

  On the other hand, the split die 2 is configured such that, for example, the split holder 7 is lifted via the split holder support plate 15 so that the holder portions 7A to 7D can be expanded. It arrange | positions in the level | step-difference part 7b of the part 7A-7D. The die portions 2A to 2D are switched to a closed state via the switching means (8a, 7a, 15) described above when the split holder 7 is lowered to the lower limit position of FIG. It is done. That is, the switching means is configured such that the split holder 7 is fitted with the downward taper that is the outer peripheral surface 7a of the split holder 7 and the downward taper that is the inner peripheral surface of the holder main body side holding hole 8a. When lowered through 15, the holder portions 7 </ b> A to 7 </ b> D are brought into close tightening due to the wedge action between the tapers, and the die portions 2 </ b> A to 2 </ b> D are held in a closed state. FIG. 1 and FIG. 3 (a) show a tightening mode of the divided holder 7 (holder portions 7A to 7D). In this form, in the tightening mode, the upper surface of the main body 8 and the upper end surfaces of the split holder 7 (holder portions 7A to 7D) and the split die 2 (die portions 2A to 2D) are set to be flush with each other. Yes.

  Next, a powder compression method using the above powder molding apparatus 1 will be described. As this powder compression method, a powder filling process for filling the cavity C with the powder H, a pressurizing process for compressing the powder H, and a die cutting process for extruding the molded body are performed. 1 and 2 show a powder filling process. In this step, the divided holder 7 is disposed at the lower limit position via the divided holder support plate 15, and the lower punch 5 is disposed at the lower limit position via the lower punch support plate 13, and the die hole formed in the closed state of the divided die 2. A cavity C is defined by 2 a, the lower punch 5, and the core rod 6. The cavity C is filled with the powder H through the powder supply device as in the conventional case.

  FIG. 4 shows the pressurizing process. In this step, the upper punch 4 is lowered through the upper punch support plate 17 and inserted into the die hole of the divided die 2, and the lower punch 5 is raised through the lower punch support plate 13, The powder H in the cavity C is compressed. Reference numeral H1 denotes a molded body in which the powder H is pressure-molded in this way.

  5 to 8 show a die cutting process. In this step, first, as shown in FIG. 5, the upper punch 4 is lifted through the upper punch support plate 17 and pulled out from the die hole of the split die 2, and the split holder 7 is lifted up through the split holder support plate 15. Raised to position. When the split holder 7 is switched to the upper limit position, the outer peripheral taper of the outer peripheral surface 7a of the split holder 7 (holder portions 7A to 7D) is fitted with play with respect to the inner peripheral taper of the die body side holding hole 8a. Therefore, the split holder 7 (holder portions 7A to 7D) can be finely moved in the arrow direction (radial direction) in FIG. 5 to be in a non-tightening mode, and the split die 2 (die portions 2A to 2D) can be expanded. Keep in state. That is, the split die 2 is not subjected to the restraining force from the split holder 7 and is slightly expanded outward in the radial direction. FIG. 6 schematically shows such an operation with arrows.

In this state, the lower punch 5 is raised to the upper limit position of Figure 7 through the lower punch support plate 13. Then, the molded body H1 in the die hole of the split die 2 is pushed up by the lower punch 5 and extracted from the die hole. In this extraction process, the molded body H1 is held between the inner periphery of the die hole and the outer periphery of the core rod 6 because the split holder 7 holds the split die 2 in a state where the split die 2 can be expanded in the above-described non-tightening manner. It is pushed up by the lower punch 5 with almost no frictional force.

Next, as shown in FIG. 8, the split holder 7 is lowered to the lower limit position via the split holder support plate 15. At the same time, the lower punch 5 is lowered through the lower punch support plate 13 until the upper end is flush with the upper surface of the die body 8 (and the upper end of the divided holder 7 at the lower limit position). In this state, the molded body H1 is transferred from the die table including the die outer peripheral portion 9, the die main body 8, and the divided holder 7 holding the divided die 2 to a target location.

(Second Mode) In this mode, FIG. 9 corresponds to FIG. 2, FIG. 10 corresponds to FIG. 4, FIG. 11 corresponds to FIG. 5, and FIG. This powder forming apparatus 1A is an example of forming a columnar shaped body H2, and as shown in FIGS. 9 and 10, the divided die 22 and the divided die 22 are held in a closed state and a state where the divided die 22 can be expanded. A raw material powder H filled in a cavity C1 provided with a die holder 3, an upper punch 4A and a lower punch 5A, and defined by a die hole 20a and a lower punch 4A formed with the divided die 22 closed, 3 and the upper and lower punches 4A and 5A. The main part is the same as the above embodiment. That is, the die holder 3 is provided with the switching means (8a, 27a, 15 for switching the split holder 27, the main body 8 holding the split holder 27, and the tightening mode in which the split holder 27 is closed and the non-tightening mode in which the split holder 27 can be expanded. The split holder 27 holds the split die 22 in a closed state in the tightening mode, and holds the split die 22 in a state in which the split die 22 can be expanded in the non-tightened mode. Further, the switching means (8a, 27a, 15) sets the outer peripheral surface 27a of the split holder 27 and the inner peripheral surface of the holder main body side holding hole 8a to taper fitting, and the split holder 27 is attached to the split holder support plate 15. It is the composition which goes up and down via.

The press structure of the powder molding apparatus 1A is different in that there is no core rod 6 of the above form, but is otherwise substantially the same as the above form. That is, the upper punch 4 </ b> A is fixedly supported by the upper punch presser 18 with respect to the upper punch support plate 17, and can be moved up and down via the upper punch support plate 17. The split holder 27 is restrained and supported by a chuck 16A such as a collect chuck attached to the split holder support plate 15, and can be moved up and down by a predetermined dimension by a hydraulic device (not shown) via the split holder support plate 15. ing. The lower punch 5A is fixedly supported by the lower punch holder 14 with respect to the lower punch support plate 13, and protrudes from the through hole provided in the divided holder support plate 15 and the inner diameter of the divided holder 27 toward the divided die 22 side. The lower punch support plate 13 can be moved up and down by a hydraulic device (not shown) or the like.

  The division die 22 is an example of four equal parts as shown in FIG. 9, and is divided as die portions 22A to 22D along the periphery of the rectangle. Each die part 22A-22D is hold | maintained so that switching to the state which closed the division die 22 via the division holder 27 of the die holder 3 and the state which can be expanded is possible. That is, the state in which the divided die 22 is closed is a state at the time of powder filling and compression molding in which the die portions 22A to 22D are constrained without gaps to form the regular die hole 20a. The state in which expansion is possible means that when each die part 22A to 22D receives an outward stress from the inside, the constraint is released and a minute gap is formed between the die parts. It is an unrestrained state when extruding from the die hole 20a.

  Of the die holder 3, the split holder 27 is an example of four equal parts like the split die 22, and is divided into holder portions 27 </ b> A to 27 </ b> D corresponding to the corresponding portions of the die portions 22 </ b> A to 22 </ b> D. In the tightening mode in which the divided holder 27 is closed as shown in FIG. 9, the outer peripheral surface 27a of each of the holder portions 27A to 27D has a taper that gradually slopes outward, that is, increases in diameter as the upper side goes upward. The side is a vertical surface with the same diameter. Moreover, in each holder part 27A-27D, the level | step-difference part which arrange | positions die | dye part 22A-22D is provided inside the said upper side. The lower inner peripheral surface is formed corresponding to the lower punch 5A. In addition, an engaging groove for chuck is provided on the lower side of the lower vertical surface.

  The main body 8 has a substantially central holding hole 8a for supporting the divided die 22, engaging groove portions provided on the upper and lower surfaces of the outer periphery, and a ring-shaped die outer peripheral portion 9 integrated on the outer periphery. doing. The holding hole 8a is a taper that gradually increases in diameter as the inner periphery goes on the same as the outer peripheral surface 7a on the upper side of the split holder, and when the split holder 27 is inserted from above in a closed state, Become. The die outer peripheral portion 9 has an engagement groove portion whose inner periphery faces the engagement groove portion of the main body 8 and an inner diameter portion that engages with the engagement groove portion of the main body 8, and the inner diameter portion is engaged with the outer periphery of the main body 8. It is integrated by engaging with the mating groove portion and mounting the connecting member 19 across the engaging groove portions. The die outer peripheral portion 9 constitutes a die table together with the die holder 8 holding the die body 8 and the divided die 22. Further, the upper end of the guide rod 11 is connected to the die outer peripheral portion 9 as in the first embodiment.

  The above-described split holder 27 and split die 22 are assembled into the main body 8 by the following procedure example. The split holder 27 is, for example, inserted into the main body side holding hole 8a downward in a state where the holder portions 27A to 27D are arranged in a rectangular frame shape, and then attached to the chuck 16A provided on the split holder support plate 15 The lower end side of the part is held. The chuck 16A always holds the lower sides of the holder portions 27A to 27D, and when the divided holder support plate 15 is lifted from the lower limit position of FIG. 10 as shown in FIG. 11, the holder portions 27A to 27D are held. What is necessary is just the structure which hold | maintains in the non-tightening aspect which can be expanded, and hold | maintains each holder part 27A-27D in the closed tightening aspect, when it descend | falls to the lower limit position of FIG.

  On the other hand, in the split die 22, the split holder 27 is lifted via the split holder support plate 15 so that each of the holder portions 27A to 27D can be expanded. It arrange | positions in the level | step-difference part of -27D. Each die part 22A-22D switches to the closed state via the switching means (8a, 27a, 15) described above when the split holder 27 is lowered to the lower limit position of FIG. 10 via the split holder support plate 15. It is done. That is, the switching means is configured such that the split holder 27 is fitted with the downward taper that is the outer peripheral surface 27a of the split holder 27 and the downward taper that is the inner peripheral surface of the holder main body side holding hole 8a. When lowered through 15, the holder portions 27 </ b> A to 27 </ b> D are in close contact with each other by the wedge action between the tapers, and the die portions 22 </ b> A to 22 </ b> D are held in a closed state. 9 and 10 show a tightening mode of the split holder 27 (holder portions 27A to 27D). Also in this form, in the tightening mode, the upper surface of the main body 8 and the upper end surfaces of the split holder 27 and the split die 22 are set to be flush with each other.

  Next, a powder compression method using the above powder molding apparatus 1A will be described. Even in this powder compression method, a powder filling process for filling the cavity C1 with the powder H, a pressure process for compressing the powder H, and a die-cutting process for extruding the molded body are performed. In the powder filling step, the divided holder 27 is disposed at the lower limit position via the divided holder support plate 15, and the lower punch 5 </ b> A is disposed at the lower limit position via the lower punch support plate 13. A cavity C1 is defined by the hole 20a and the lower punch 5A. The cavity C1 is filled with powder H through a powder supply device.

  FIG. 10 shows a pressurizing process. In this step, the upper punch 4A is lowered via the upper punch support plate 17 and inserted into the die hole of the split die 22, and the lower punch 5A is raised via the lower punch support plate 13, The powder H in the cavity C1 is compressed. The symbol H2 is a molded body in which the powder H is pressure-molded in this way.

  11 and 12 show the die cutting process. In this step, first, as shown in FIG. 11, the upper punch 4 </ b> A is lifted through the upper punch support plate 17 and pulled out from the die hole of the split die 22. Raised to position. When the split holder 27 is switched to the upper limit position, the outer peripheral taper of the outer peripheral surface 27a of the split holder 27 (holder parts 27A to 27D) fits with the inner peripheral taper of the main body side holding hole 8a with play. The split holder 27 (holder parts 27A to 27D) can be finely moved in the arrow direction (radial direction) in FIG. Hold on. That is, the split die 22 does not receive the restraining force from the split holder 27 and is slightly expanded radially outward.

From this state, the lower punch 5 </ b> A is raised to the upper limit position of FIG. 12 via the lower punch support plate 13 . Then, the molded body H2 in the die hole of the divided die 22 is pushed up by the lower punch 5A and extracted from the die hole. In this extraction process, the molded body H2 has almost no frictional force with the inner periphery of the die hole because the split holder 27 holds the split die 22 in a state where the split die 22 can be expanded in the above-described non-tightening manner. It is pushed up by the lower punch 5A without receiving.

After that, although not shown, it is the same as the above embodiment. That is, the split holder 27 is lowered to the lower limit position via the split holder support plate 15. At the same time, the lower punch 5A is lowered through the lower punch support plate 13 until the upper end is flush with the upper surface of the die body 8 (and the upper end of the division holder 27 at the lower limit position). In this state, the molded body H2 is transferred from the die table including the die outer peripheral portion 9, the die main body 8, and the divided holder 27 holding the divided die 22 to a target location.

It is a longitudinal cross-sectional view which shows the powder shaping | molding apparatus of a 1st form in a powder filling state. (A) is a top view of the apparatus main body of FIG. 1, (b) is the sectional view on the AA line of FIG. (A) is a principal part perspective view shown in the state where the division die of Drawing 1 was closed, (b) is a principal part perspective view shown in the state where the division die was expanded. It is a longitudinal cross-sectional view which shows the apparatus of FIG. 1 in the state which compressed the powder. FIG. 5 is a longitudinal sectional view in which the above-mentioned apparatus is changed from the state of FIG. 4 to a state in which a split die can be expanded. FIG. 6 is a cross-sectional view taken along line A1-A1 of FIG. It is the longitudinal cross-sectional view which raised the molded object from the state of FIG. It is the longitudinal cross-sectional view which made the said apparatus the state which closed the division | segmentation die again from the state of FIG. (A) is a top view which shows the powder shaping | molding apparatus of a 2nd form corresponding to FIG. 2 (a), (b) is the BB sectional drawing of FIG. It is a longitudinal cross-sectional view which shows the apparatus of a 2nd form corresponding to FIG. It is a longitudinal cross-sectional view which shows the apparatus of a 2nd form corresponding to FIG. It is a longitudinal cross-sectional view which shows the apparatus of a 2nd form corresponding to FIG. (A), (b) is the longitudinal cross-sectional view and BB sectional drawing of the powder shaping | molding apparatus disclosed by patent document 1. FIG.

DESCRIPTION OF SYMBOLS 1,1A ... Powder molding apparatus 2,22 ... Dividing die (2A-2D is a die part, 22A-22D is a die part)
2a, 20a ... Die hole 3 ... Die holder (8 is main body, 8a is holding hole, 9 is die outer peripheral part)
4, 4A ... Upper punch 5, 5A ... Lower punch 6 ... Core rod 7, 27 ... Divided holder (7A-7D is holder part, 27A-27D is holder part)
DESCRIPTION OF SYMBOLS 10 ... Base support plate 11 ... Guide rod 13 ... Lower punch support plate 15 ... Divided holder support plate 17 ... Upper punch support plate C, C1 ... Cavity H ... Raw material powder H1, H2 ... Compact (green compact)

Claims (4)

A die hole formed in a state in which the split die is closed, the split die being radially divided, a die holder that holds the split die in a closed state and a state in which the split die can be expanded, and an upper and lower punch; In the powder molding apparatus for compressing the raw material powder filled in the cavity defined by the lower punch or the core rod disposed in the die hole by the relative movement of the upper and lower punches,
The die holder has a main body that forms a holding hole penetrating vertically, an outer diameter that fits into the holding hole, and a step portion that is one step larger in diameter, and the divided die is fitted to the step portion. A split holder that is radially divided, and a switching means that switches the split holder to a closed tightening mode and a non-tightening mode that allows expansion.
The divided holder, the split die is held in a closed state, and holds the said split die ready expansion is a mode with a non-clamping in the manner tightening, which can be its expanded state In the powder molding apparatus, the split die can be disposed in the stepped portion in a replaceable manner . The Daihoruta is held in base over scan support plate, the lower punch is held on the lower punch support plate, the divided holder is held in divided holder supporting plate, the upper punch is held by the upper punch supporting plate, The powder molding apparatus according to claim 1, wherein the lower punch support plate, the split holder support plate, and the upper punch support plate can be moved up and down relatively with respect to the base support plate.
  The switching means is formed in a taper that increases in diameter as the outer peripheral surface of the split holder and the inner peripheral surface of the holding hole go upward, and the split holder is lifted through a support plate. The powder molding apparatus according to claim 1, wherein the non-tightening mode is reached and the tightening mode is set by being lowered.   The powder molding apparatus according to claim 3, wherein the split die is arranged such that a boundary between the die portions is deviated from the boundary between the holder portions by a predetermined dimension with respect to the split holder.

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