JPH09141499A - Die exchange mechanism for rotary type powder press molding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the exchange of the die composed of a die and upper and lower punches for the purpose of press molding in particular and to make a contribution to the shortening of the die exchange time with a rotary type powder press molding device for solidifying and molding a powder material by pressurizing. SOLUTION: This mechanism includes a holder 26 for external preparatory plan which has an upper punch supporting section 28 for supporting the upper punch 23 movably in an axial direction on one end side in the axial direction, has a die supporting section 36 for fixing and supporting the die 21 in the intermediate part of the axial direction and has a lower punch supporting section 39 for supporting the lower punch 24 (including a core punch 25 in some cases) movably in the axial direction into a cylinder body from the other end side in the axial direction. This holder 26 for external preparatory plan is made attachably and detachably settable at an intermediate turn table 12 of a turn table assembly via a fixing means 73. The max. amt. of packing in the die is made adjustable and settable by the exchange of a means 71 for adjusting and setting the amt. of packing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary type powder pressure molding apparatus for pressing and solidifying powder material such as ceramic powder, ferrite powder or tungsten powder. In particular, the die for powder pressure molding, the upper punch and the lower punch (which may also include the core punch) can be collectively set as an external setup holder in the external setup holder as a mold combination. The dies can be quickly and easily replaced through the holder to shorten the dies exchange time, and moreover, the dies can be replaced accurately and surely to save the labor of the dies exchange work. At the same time, it reduces the tilting force applied to each punch when the machine is operating.Furthermore, it is possible to adjust and set the maximum filling amount of the powder material filled in the die in the mold combination. It relates mold exchanging mechanism in the rotary powder compression molding apparatus.

[0002]

2. Description of the Related Art As is well known, when processing materials such as ceramics, ferrites or tungsten which are difficult to machine in the past, they are once pulverized into a powder material and subjected to pressure treatment. A method of solidifying and molding into a powder pressure-molded product has been widely adopted, and the powder material pressure-molded product molded by the method has been widely used in many industrial fields.

Conventionally, many devices have been developed and provided for the purpose of pressure-molding the powder material as described above. This type of powder material pressure molding device,
Basically, a die having a through-molding hole extending in the axial direction, and an upper punch and a lower punch (necessary for pressing the powder material filled in the die from both openings of the through-molding hole of the die) Depending on the, may include a core punch) and.

An example of a conventional powder material pressure molding apparatus is provided as a rotary pressing apparatus, in which the die and the pair of punches are an intermediate rotary table for supporting the die and the upper punch. A lower rotary table supporting the upper punch and a lower rotary table supporting the lower punch, respectively, and a filling step in a powder material filling stage during the rotation period of the rotary table, a weighing step in the powder material measuring stage, The powder material pressure-molded product is obtained through the pressure step in the powder material pressure stage and the recovery step in the processed molded product recovery stage.

[0005]

According to this rotary type powder pressure molding apparatus, a die, an upper punch and a lower punch (may include a core punch) each time the shape of the molded product to be molded changes. It is necessary to exchange all of the plural sets of mold combinations constituted by. Conventionally, in the rotary powder pressure molding apparatus, a die is replaced by a die, an upper punch and a lower punch according to the form of a molded product to be molded in the next stage with the pressure molding apparatus stopped. Are individually and directly combined with the rotary table assembly in the pressure molding apparatus. When combining the die groups, the axial center of the die, the upper punch and the lower punch must be aligned and the axial position must be set reliably and accurately for each die combination. The replacement work of the mold combination has to be performed in a limited small space of the pressure molding apparatus, and the work is extremely complicated and extremely inconvenient in terms of workability.

[0006] Further, when the pressure-molded products to be molded in this rotary type powder pressure molding apparatus are made to be in small lots and a large variety of products are required, and the molds must be frequently replaced, the operating time of the apparatus is increased. On the other hand, it has been pointed out that there are serious problems such as a reduction in the actual operation rate of the pressure molding device because the down time of the device required for exchanging the mold becomes extremely long.

Further, as in the conventional rotary powder pressure molding apparatus described above, the die is supported on the intermediate rotary table, and the upper punch supported on the upper rotary table is advanced from above the die. In the structure in which the lower punch supported on the lower rotary table is made to enter from the lower part of the die, the tilting force acts on the upper punch and the lower punch at the stage of gradually pressing while rotating the table, There was a problem in the consistency of the upper punch and the lower punch with respect to the die center.

[0008] Therefore, the present invention is intended to eliminate the drawbacks and problems found in the above-mentioned conventional rotary type powder pressure molding apparatus when the die is replaced. During the operation period of the molding apparatus, the dies according to the form of the pressure-molded product to be pressure-molded next are preliminarily combined outside the pressure-molding apparatus to stand-by, and the pressure-molding process of the previous stage It is an object of the present invention to provide a mold exchanging mechanism in a rotary powder pressure molding device in which the device is stopped after completion of the process and the molds in a pre-assembled state can be mounted on the device as they are.

Further, the present invention has a problem in the above-mentioned conventional rotary type powder pressure molding apparatus, that is, to the upper punch and the lower punch which occur at the stage of gradually pressing while rotating the table. It is an object of the present invention to provide a mold exchanging mechanism in a rotary powder pressure molding apparatus which is suitable for surely preventing a tilting force and ensuring the consistency of an upper punch and a lower punch with respect to a die axis.

Further, according to the present invention, the maximum filling amount of the powder material to be filled in the die can be appropriately set in advance for the die combination including the die, the upper punch and the lower punch. Another object of the present invention is to provide a mold exchanging mechanism in the rotary type powder pressure molding apparatus.

[0011]

In order to achieve the above object, the present invention is specifically provided with one rotating shaft extending in the vertical direction, and is provided with a predetermined interval in the axial direction with respect to the rotating shaft. A rotary table assembly comprising an upper rotary table, an intermediate rotary table, and a lower rotary table assembled so as to rotate integrally in parallel with each other, and a die having a through-molding hole extending in the axial direction. , An upper punch combined so as to enter into the die from the upper side of the through-molding hole of the die, and a lower punch combined so as to enter into the die from the lower side of the through-molding hole of the die. And a plurality of sets of molds including a powder filling stage, a powder weighing stage, and a powder pressurizing stage during one rotation period of the rotary table assembly. In the rotary type powder pressure molding device that is brought to the stage for collecting and processed molded products, it is a cylindrical body having a through hole penetrating in the axial direction, and the upper punch is provided on one end side in the axial direction. An axially movable upper punch supporting portion is provided, and an axially intermediate portion is provided with a die supporting portion for fixedly supporting the die, and the lower punch is axially penetrated from the other end side in the axial direction. It has a lower punch support part for movably supporting the direction, and removes the die, the upper punch and the lower punch from the pressure forming device according to the form of the work to be formed, and the shaft is preliminarily adjusted to the axial center in advance. The intermediate table includes an external setup holder that is supported together, and the intermediate table is provided with a lower table portion and an upper table portion that are parallel to each other at a predetermined interval in the axial direction. The die, the upper punch, and the lower punch are radiated outward from the mounting position for the external setup holder, which is provided at a predetermined angular interval on the intermediate rotary table in the rotary table assembly through the external setup holder. It is mountable, and constitutes a mold exchanging mechanism in the rotary type powder pressure molding apparatus which can be fixed by the fixing means provided on the lower table portion and the upper table portion of the intermediate rotary table.

Further, according to the present invention, the external setup holder is arranged between the lower end portion of the upper ram arranged on the upper rotary table of the rotary table assembly and the upper end portion of the external setup holder in the radial outward direction. From the above, a rotary type is provided, which is provided with engaging mounting means for engaging with each other and positioning and mounting the external setup holder at the external setup holder mounting position. A die exchange mechanism in the powder pressure molding apparatus is configured.

Furthermore, in the present invention, the external setup holder includes a filling amount adjusting setting means for adjusting and setting a maximum filling amount of the powder material to be filled in the die in the mold combination. The rotary type powder pressurizing means, wherein the filling amount adjustment setting means comprises a filling amount adjustment setting member for axially positioning and setting the forming punch surface of the lower punch in the die combination in the die. It also constitutes a mold exchanging mechanism in the molding apparatus.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A mold exchanging mechanism in a rotary powder pressure molding apparatus according to the present invention will be described in detail below with reference to specific embodiments shown in the drawings. FIG.
FIG. 2 is a front view of an apparatus showing an outline of a basic configuration of a rotary type powder pressure molding apparatus to which the present invention is applied.
FIG. 2A is a concrete configuration example of a mold exchanging mechanism in the rotary powder pressure molding apparatus according to the present invention, and also shows the details of the basic configuration of the external setup holder. 2B is a schematic vertical cross-sectional view as seen from a side surface direction, FIG. 2B is a schematic horizontal cross-sectional view as seen in the direction of arrow B of FIG. 2A, and FIG. 2C is an arrow of portion C of FIG. 2A. 2D is a schematic cross-sectional view as seen in the direction of view, FIG. 2D is a schematic cross-sectional view as seen in the direction of arrow D of FIG. 2A, and FIG.
FIG. 2B is a schematic cross-sectional view of an E portion in FIG. 2A as viewed in the direction of the arrow. On the other hand, FIG. 3A is a schematic vertical cross-sectional view of the mold exchanging mechanism shown in FIG. 2A as seen from the front direction, and FIG. 3B is a schematic cross section as seen in the direction of arrow 3B-3B in FIG. 3A. It is a side view.

On the other hand, FIG. 4 shows the application of the filling amount adjustment setting means in the basic configuration example of the external setup holder.
FIG. 4A shows a mode in which the maximum filling amount of the powder material filled in the die is changed, and FIG. 4A shows a configuration example in which a filling amount adjustment setting member having an axial dimension L ₂ is used. FIG. 4B is a schematic vertical cross-sectional view of the mold changing mechanism viewed from the side, showing a configuration example in which a filling amount adjustment setting member having an axial dimension L ₃ is used. FIG.

Further, FIG. 5 is a lower punch operation diagram schematically showing an operation mode of the lower punch and the lower ram in the mold assembly in the present invention. FIG. 6 is a lower punch operation diagram schematically showing the operation mode of the lower punch in the conventional powder pressure molding apparatus, corresponding to FIG. 5.

In the present invention, the rotary type powder pressure molding apparatus 1 basically comprises a machine body 3 having one rotary shaft 2 extending in the vertical direction, and a rotary body assembled to the rotary shaft 2. And a table assembly 4. The machine body 3 has a machine base 5, and an upper pressure mechanism 6 and a lower pressure mechanism 7 are provided on the machine frame 5 at positions separated from the rotary shaft 2. Aircraft 3
Includes a cabin housing 8 extending above the machine base 5, and a front wall of the cabin housing 8 includes:
A window opening 9 corresponding to the entire portion of the rotary table assembly 4 is provided, and the window opening 9 is combined with a shutter 10 which is vertically operated by an external operation to open and close the window opening 8.

On the other hand, the rotary table assembly 4 is an upper rotary table which is assembled so as to rotate integrally in parallel with each other at a predetermined interval in the axial direction at an axially intermediate portion of the rotary shaft 2 in the machine body 3. 11, an intermediate rotary table 12, and a lower rotary table 13. The main rotary system in the powder pressure molding apparatus including the rotary table assembly 4 includes, for example, a worm wheel 14 attached to the rotary shaft 2 and the worm wheel 1.
The worm gear 15, the variable speed reduction mechanism 16, and the rotary power source 17, which mesh with the gear 4, are configured to rotate at an appropriately set rotational speed. The intermediate rotary table 12 includes a lower table portion 12A and an upper table portion 12 that are integrated and extend in parallel with each other with a gap in the axial direction.
It consists of B and.

In the present invention, the die assembly 20 includes a die 21 having a through-molding hole 22 extending in the axial direction, and the die 2 from the upper side of the through-molding hole 22 of the die 21.
1 and an upper punch 23 combined so as to enter into the die 1, and at least one lower punch 24 combined so as to enter into the die 21 from the lower side of the through-molding hole 22 of the die 21. .

Next, in the mold exchanging mechanism in the rotary type powder pressure molding apparatus according to the present invention, a specific configuration example of the external setup holder 26 constituting the main part thereof will be described. 21, upper punch 23, lower punch 24 and core punch 2
The combination structure of No. 5 will be described. First, in the present invention, the lower punch 24 and the core punch 25 are concentrically combined inside the external setup holder 26 and are slidable individually along the axial direction. The lower punch 24 has a forming punch surface 24a on one end side. The forming punch surface 24a
Has an outer diameter that slidably fits into the through molding hole 22 of the die 21 and an inner diameter through hole 24b that slidably fits into the outer diameter of the core punch 25. ing. The core punch 25 has a core punch surface 25a on one end side. The core punch surface 25
a has an outer diameter that slidably fits in the through hole 24b of the lower punch 24 and slidably fits in the through hole 23a of the upper punch 23.

Next, the mold exchanging mechanism according to the present invention will be described in detail with reference to FIGS. 2 and 3. According to the specific example shown in FIGS. 2 and 3, the lower punch 2
4 includes a core punch 25. In the present invention, the mold exchanging mechanism is constituted by an external setup holder 26. The external setup holder 26 is a tubular body having a through hole 27 penetrating in the axial direction, and has an upper punch support portion 28 for axially movably supporting the upper punch 23 on one end side 26a in the axial direction. I have it. The upper punch 23 is attached to an upper punch holder 30 via an upper punch holder 29. The upper punch holder 30 corresponds to the external setup holder 26.
Is assembled to the upper punch support portion 28 in FIG. 1 so as to be slidable in the axial direction by the key mechanism 32 with respect to the upper punch sleeve 31 fixed by, for example, bolts.
The upper punch sleeve 31 is located on the upper side in the axial direction and has a flat notch 31a on the outer periphery thereof. The intermediate punch 12 is fixed by a toggle clamp fixing means described later.
The upper table portion 12B of the rotary axis direction (arrow X
Direction) and is fixed by pressing.

On the other hand, the upper punch sleeve 31 is an intermediate portion in the axial direction, and a pressure ring 33 is attached to the outer periphery thereof. The pressure ring 33
Is provided with a convex portion 33b protruding upward on a part of its upper surface 33a, and abuts against the pressure ring receiver 12Ba formed on the lower surface of the upper table portion 12B of the intermediate table 12. They are formed so as to correspond to each other. That is, when the holder 26 for external setup is mounted on the intermediate table 12, the holder 26 for external setup is inserted into the mounting position, and then the pressure ring 33 is rotated so that the holder 26 is provided on the pressure ring 33. By bringing the convex portion 33b that is formed into contact with the pressure ring receiver 12Ba provided on the upper table portion 12B of the intermediate table 12, the external setup holder 26 can be fastened securely in the axial direction. It has become.

An upper ram 35 is attached to the upper rotary table 11 via an upper ram sleeve 34 so as to be slidable in the axial direction. The upper ram 35 is adapted to be pushed downward by the upper side pressure mechanism 6, and the upper punch 23 is actuated via the working surface 30a of the upper punch holder 30 which contacts the lower end 35a of the upper ram 35. Can be moved downwards.

In a preferred embodiment of the present invention, the external setup is provided between the lower end of the upper ram 35 arranged on the upper rotary table 11 of the rotary table assembly 4 and the upper end of the external setup holder 26. Holder 2
When attaching 6 to the rotary table assembly from the radial outside direction, there is provided an engagement mounting means 70 for engaging with each other to position and attach the external setup holder to the external setup holder attachment position. .

According to a preferred example of the engagement mounting means 70, a thin neck portion 35 is provided at a lower end portion of the upper ram 35 arranged on the upper rotary table 11 in the rotary table assembly 4.
An outer peripheral flange 35B is provided at the lower end thereof through A. On the other hand, at the upper end of the upper punch holder 30, there is a U-shaped cut 30A that opens in one radial direction so that the small diameter neck portion 35A of the upper ram 35 can be received in the radial direction. Lower rim 35 of upper ram 35
A U-shaped notch 30B is provided concentrically, which is open toward one side in the radial direction so that B can be received in the radial direction. With this structure, the external setup holder 26 can be quickly and easily mounted from the outer radial direction to the upper ram 35 arranged on the upper rotary table 11 of the rotary table assembly 4.

The external setup holder 26 is provided with a die support portion 36 for fixing and supporting the die 21 at an intermediate portion in the axial direction. The die 21 is fixed to the die support portion 36 of the external setup holder 26 by a die fixing nut 37. A table 38 screwed to the external setup holder 26 is arranged on the upper side of the die 21.

Further, the external setup holder 26.
Is provided with a lower punch support portion 39 that supports the lower punch 24 and the core punch 25 movably in the axial direction on the other end side 26b in the axial direction. First, the lower punch 24
It is attached to the lower punch holder 42 via the lower punch holder 41 with the seat member 40 interposed. The lower punch holder 42 is assembled slidably in the axial direction with respect to a pair of upper and lower holder bearings 43, 44 which are fixed to the lower punch support portion 39 of the external setup holder 26 by, for example, screwing. There is. In particular, a key mechanism 44A is provided between the lower punch holder 42 and the lower holder bearing 44. A spring 45 biased in the expansion direction is disposed between the step seat surface 42a of the lower punch holder 42 and the lower surface of a core punch holder, which will be described later.

A lower ram 48 is axially slidably attached to the lower rotary table 13 via a pair of upper and lower ram metals 46 and 47 screwed into the lower rotary table 13. The lower ram 48 is urged in the expansion direction by a lower ram spring 49 arranged between the lower surface 46a of the upper ram metal 46 and the step seat surface 48a of the lower ram 48. The lower ram 48 is adapted to be pushed upward by the lower side pressure mechanism 7, and is pressed against the spring 45 via the lower punch holder 42 that comes into contact with the upper end 48b of the lower ram 48. The lower punch 24 can be moved upward.

In the embodiment shown in FIGS. 2 and 3, the core punch 25 is fixed to the core punch holder 51 by the core punch fixing bolt 50 at the lower end side thereof. The core punch holder 51 can move axially in a slit formed in the lower punch holder 42 along the radial direction. The core punch holder 51 and the upper holder bearing 43
A core punch height adjusting collar 52 is arranged between the and.

Further, according to the present invention, the external setup holder 26 is provided with a filling amount adjusting setting means 71 for adjusting and setting the maximum filling amount of the powder material filled in the die 21 of the mold assembly 20. Consists of The filling amount adjustment setting means 71 includes a filling amount adjustment setting member 72 for axially positioning and setting the forming punch surface 24a of the lower punch 24 in the mold assembly 20 in the die 21. As shown in FIGS. 2, 4A and 4B, the filling amount adjustment setting member 72 is made up of a tubular member having axial dimensions L ₁ , L ₂ , L ₃ , and L _n , and has an upper end side 72 a. Is fixed to the lower punch holder 41, and abuts against the lower punch holder bearing 43 at the lower end 72b.

In the present invention, the filling amount adjustment setting members 72 having different axial dimensions are prepared, and the filling amount adjustment setting members 72 are selectively used for the external setup holder 26.
By incorporating the powder material in the die 21, the maximum filling amount of the powder material filled in the die 21 can be adjusted and set. For example, when the filling amount adjustment setting member 72 having the axial dimension L ₁ is combined as shown in FIG. 2, the filling amount F ₁ of the powder material is filled in the die 21, and as shown in FIG. When the filling amount adjustment setting member 72 of the dimension L ₂ is combined, the filling material of the filling amount F ₂ is filled in the die 21, and the filling amount adjustment setting member 72 of the axial dimension L ₃ is filled as shown in FIG. 4B. When the above are combined, the die 21 is filled with the powder material of the filling amount F ₃ .

Next, based on FIGS. 2, 3 and 4, a specific structure of the intermediate rotary table 12 and an assembling mode of the external setup holder 26 with respect to the intermediate rotary table 12 will be described. The intermediate rotary table 12 has a lower table portion 12A extending in the radial direction on the lower end side in the axial direction and an upper table portion 12B extending in the radial direction on the upper end side in the axial direction.

The lower table portion 12A and the upper table portion 12B each have an equal angular interval, for example, 7
The external setup holder 26 with an angular interval of 2 °
There are U-shaped slots 53, 54 open towards the outer periphery for mounting the.

On the other hand, in the present invention, a fixing means 73 for fixing the external setup holder 26 to the rotary table assembly 4 will be described. In the present invention, the fixing means 73 is configured by a so-called toggle clamp, and is configured by an upper toggle clamp 74 and a lower toggle clamp 75. According to a preferred embodiment of the present invention, a toggle clamp is attached to each of the upper rotary table 11 and the lower rotary table 13 of the rotary table assembly 4 at their external setup holder mounting positions,
As shown in FIG. 2, after the external setup holder is mounted at the external setup holder mounting position, the toggle clamp is manually operated from the state indicated by the phantom line to the state indicated by the solid line to set the external setup holder 26. Is securely pressed and fixed to the rotary table assembly 4 at the two points on the upper end side and the lower end side in the direction of the rotation axis.

Next, the procedure for exchanging the mold will be described based on the mold exchanging mechanism in the rotary type powder pressure molding apparatus according to the present invention. First, core punch 25
If desired, the desired core punch 25, core punch adapter 25A, and core punch holder 50 are assembled, and the spring 45 and the assembled core punch assembly as described above are inserted into the lower punch holder 42 and set. On the other hand, with respect to the lower punch 24, the seat member 40, the lower punch 24, and the lower punch holder 41 are assembled in this order on the lower punch holder 42 and fixed by screwing. Insert the lower punch 24 and the core punch assembly from below the external setup holder 26,
The lower metal is fixed to the external setup holder 26 with screws.

On the other hand, the die 21 is fixed to the die supporting portion 36 of the external setup holder 26 by a die fixing nut 37. In this case, first, the external setup holder 26 is attached to the mold setting jig, the handle is turned, and the lower punch 24 is raised to the position at the time of knockout. At this time, the die spacer 37
A, the die fixing nut 37 is passed through the lower punch 24. In this state, the die 21 is set while aligning it with the lower punch 24, and the die fixing nut 37 is screwed in and fixed with a lock screw.

On the other hand, the maximum filling amount of the powder material filled in the die 21 is determined by the filling amount adjusting setting means 71 for adjusting and setting the maximum filling amount of the powder material, which is a feature of the present invention. . This maximum filling amount is formed by fixing the filling amount adjusting setting member 72 having an axial length dimension L _n corresponding to the preset maximum filling amount to the lower punch holder 41 by screwing.

Next, the upper punch 23 is assembled to the upper punch support portion 28 of the external setup holder 26. In this case, the upper punch 23 is attached to the die 2
It is fixed by screwing to the upper punch holder 30 via the upper punch holder 29 while aligning with 1. After being fixed in this way, a standby state is established with an upper punch drop prevention stopper mounted between the die 21 and the upper punch holder 29.

The procedure for setting the external setup holder 26 assembled as described above in the rotary pressure molding apparatus is as follows. The external setup holder 26 in the standby state is taken out from the storage cylinder, and the lower table portion 12A of the intermediate rotary table 12 in the rotary pressure molding apparatus is taken out from the storage cylinder.
In addition, the U-shaped slots 53 and 54 provided in the upper table portion 12B are inserted from the radially outer side toward the inner side. The upper end side and the lower end side of the external setup holder 26 are clamped by the upper toggle clamp 74 and the lower toggle clamp 75 in a pressed state toward the center of the rotation axis. After that, the pressure ring 33 is rotated to clamp the external setup holder 26 in the axial direction. After that, the upper punch drop prevention stopper mounted between the die 21 and the upper punch holder 29 is removed to complete the die replacement.

FIG. 5 shows the necessity of changing the maximum filling amount of the powder material filled in the die 21 in relation to the mold exchanging mechanism in the rotary type powder pressure molding apparatus according to the present invention. The operation will be described based on the operation modes of the lower punch 24 and the lower ram 48 in the mold assembly 20. For example, as shown in FIG. 6, according to the operation mode of the lower punch in the conventional powder pressure molding apparatus, the compression ratio (powder material filling dimension / molded article dimension) is 2, and the overfill amount is 5 mm. Then, in the case of a molded product of 5 mm, the required maximum filling amount M is M
= 5 x 2 (compression ratio) + 5 (overfill amount) = 15 mm
In the case of a molded product of 10 mm, the required maximum filling amount M is
M = 10 × 2 + 5 = 25 mm, and in the case of a molded product of 20 mm, the required maximum filling amount M is M = 20 × 2 + 5 = 45 mm. For example, assuming that the maximum filling amount is 45 mm and a 5 mm molded product is pressed, 45- (5 × 2) = 35 mm
When the thickness of the molded product is changed, there is a problem such as the overfill amount of the above, the biting of the powder between the lower punch and the die, and the deterioration of the powder due to the excessive overfill amount.
Changing the maximum filling amount is essential.

[0041]

The mold exchanging mechanism in the rotary type powder pressure molding apparatus of the present invention having the above-mentioned structure is used for the pressure molding product to be pressure-molded next during the operation period of the pressure molding apparatus. The molds according to the form are preliminarily combined outside the pressure molding device to stand by, and after the pressure molding process of the previous stage is completed, the device is stopped, and the molds in the preliminarily combined state are left as they are. It can be mounted on the equipment, and even if the dies must be changed frequently due to the large number of small lots, the downtime of the equipment required for the dies must be minimized. It can be shortened, and it can be said that it works extremely effectively for improving work efficiency for powder pressure molding.

Further, according to the mold exchanging mechanism in the rotary type powder pressure molding apparatus according to the present invention, a die, a lower punch (core punch if necessary) and an upper punch are added to the external setup holder 26. In the point that all the molds required for pressure forming are set and they can be assembled on the intermediate rotary table, the tilting to the upper punch and the lower punch that occurs at the stage of gradually pressing while rotating the table is prevented. This can be said to be extremely effective in that the force can be reliably prevented and the alignment of the upper punch and the lower punch with respect to the die axis can be surely secured.

Further, according to the mold exchanging mechanism in the rotary type powder pressure molding apparatus according to the present invention, the mold combination of the combination of the die, the upper punch and the lower punch is filled in the die. By applying the filling amount adjustment setting means for adjusting and setting the maximum filling amount of the powder material, the maximum filling amount of the powder material filled in the die can be simply changed by the filling amount adjustment setting member. It can be said that it works extremely effectively in that it can be performed extremely easily and quickly.

[Brief description of the drawings]

FIG. 1 is a schematic front view of an apparatus showing an outline of a basic configuration of a rotary type powder pressure molding apparatus to which the present invention is applied.

FIG. 2 shows a specific structural example of a mold exchanging mechanism in the rotary type powder pressure molding apparatus according to the present invention, and FIG. 2A is a schematic vertical section as seen from a side direction. 2B is a schematic horizontal cross-sectional view of the portion B in FIG. 2A viewed in the arrow direction, and FIG. 2C is a schematic horizontal cross-sectional view of the portion C in FIG. 2A viewed in the arrow direction. 2D is a schematic cross-sectional view of the portion D in FIG. 2A viewed in the direction of the arrow, FIG.
FIG. 2B is a schematic cross-sectional view of part E in FIG. 2A as viewed in the direction of the arrow.

FIG. 3 shows a specific example of a mold exchanging mechanism in the rotary powder pressure molding apparatus according to the present invention, and FIG. 3A shows the mold exchanging mechanism shown in FIG. 2A in the front direction. 3B is a schematic vertical cross-sectional view as viewed from above, and FIG. 3B is a schematic horizontal cross-sectional view taken along line 3B-3B in FIG. 3A.

FIG. 4 shows a mode in which the maximum filling amount of the powder material filled in the die is changed by applying the filling amount adjustment setting means in the basic configuration example of the external setup holder, FIG. 4A is a schematic vertical cross-sectional view of the mold exchanging mechanism when the filling amount adjustment setting member having the axial dimension L ₂ is used, and FIG. 4B shows the axial dimension L.
FIG. 9 is a schematic vertical cross-sectional view of the mold exchanging mechanism when the filling amount adjusting and setting member of ₃ is used, viewed from the side.

FIG. 5 is an operation diagram of a lower punch and a lower ram schematically showing an operation mode of the lower punch and the lower ram in the mold assembly in the present invention.

FIG. 6 is a lower punch operation diagram schematically showing the operation mode of the lower punch in the conventional powder pressure molding apparatus, corresponding to FIG. 5.

[Explanation of Codes] 1 rotary type powder pressure molding device 2 rotary shaft 3 machine body 4 rotary table assembly 5 machine base 6, 7 pressurizing mechanism 11 upper rotary table 12 intermediate rotary table 12A lower table portion 12B upper table portion 13 Lower Rotating Table 20 Mold Assembly 21 Die 22 Through Molding Hole 23 Upper Punch 24 Lower Punch 25 Core Punch 26 External Setup Holder 28 Die Support 42 Lower Punch Holder 51 Core Punch Holder 70 Engagement Mounting Means 71 Filling Adjustment Setting Means 72 Filling amount adjustment setting member 73 Fixing means 74 Upper toggle clamp 75 Lower toggle clamp

Claims (3)

[Claims] 1. An axis of rotation extending vertically is provided,
A rotary table assembly including an upper rotary table, an intermediate rotary table, and a lower rotary table, which are assembled so as to integrally rotate in parallel with each other at a predetermined distance in the axial direction with respect to the rotary shaft. A die having a through-molding hole extending in the axial direction, an upper punch combined so as to enter the die from above the through-molding hole of the die, and the die from below the through-molding hole of the die. A plurality of sets of mold combinations including a lower punch combined so as to enter the inside, and the plurality of sets of mold combinations are powder-filled during one rotation period of the rotary table assembly. A rotary type powder pressure molding machine designed to be introduced into a stage, a powder measuring stage, a powder pressure stage, and a processed molded product collecting stage is provided with a through hole penetrating in the axial direction. The upper punch support part that axially movably supports the upper punch is provided at one end side in the axial direction, and the die support part that fixes and supports the die is provided at the intermediate portion in the axial direction. It has a lower punch support portion that penetrates the inside of the cylinder from the other end side and supports the lower punch so as to be movable in the axial direction, and includes a die, an upper punch and a lower punch according to the form of the work to be formed. The intermediate table includes a holder for external setup which is detached from the pressure molding apparatus and is externally aligned and supported in an axially aligned state in advance. The intermediate table has lower sides parallel to each other with a predetermined interval in the axial direction. A table portion and an upper table portion are provided, and the die, the upper punch, and the lower punch are predetermined on the intermediate rotary table in the rotary table assembly through the external setup holder. It can be mounted from the outside in the radial direction with respect to the mounting position of the external setup holder provided at an angular interval of, and can be fixed by the fixing means provided on the lower table portion and the upper table portion of the intermediate rotary table. A mold change mechanism in a rotary type powder pressure molding apparatus characterized by what has been done. 2. The rotary table is arranged between the lower end portion of an upper ram arranged on the upper rotary table of the rotary table assembly and the upper end portion of the external setup holder, and the external setup holder is radiated outward from the rotary table. The engaging mounting means for mounting the external setup holder by positioning the external setup holder at a mounting position of the external setup holder when the assembly is attached to the assembly. Die changing mechanism in rotary powder pressure molding equipment. 3. The external setup holder comprises a filling amount adjustment setting means for adjusting and setting a maximum filling amount of the powder material to be filled in the die in the mold combination, and the filling is performed. 2. The amount adjustment setting means comprises a filling amount adjustment setting member for axially setting and setting the forming punch surface of the lower punch in the mold combination in the die. Die changing mechanism in rotary powder pressure molding equipment.