JPH07102475B2 - Mold changing mechanism in rotary powder pressure molding machine - Google Patents

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 a powder material such as ceramic powder, ferrite powder or tungsten powder. In particular, the present invention relates to a mold exchanging mechanism in a rotary powder pressure molding apparatus that facilitates exchanging of a mold and shortens the time for exchanging the mold.

[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 above powder material. This type of powder material pressure molding device is basically
It comprises a die having a through-molding hole extending in the axial direction, and an upper punch and a lower punch for pressing the powder material filled in the die from both openings of the through-molding hole of the die.

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

[0004]

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. All sets of mold combinations consisting of must be replaced. 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. In this combination, the die, the axial center alignment of the upper punch and the lower punch, the axial position, and the like must be set reliably and accurately for each mold 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.

Further, when the pressure-molded products 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 have to 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.

Therefore, the present invention is intended to eliminate the drawbacks and problems of the conventional rotary type powder pressure molding apparatus described above when the mold 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 is performed. 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.

[0007]

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, which are assembled so as to rotate in parallel with each other, and to the rotary table assembly, A die having a positioned through-molding hole extending in the axial direction, and an upper punch supported on the upper rotary table side and combined so as to enter into the die from above the through-molding hole of the die. And a lower punch supported on the lower rotary table side and combined so as to enter the die from the lower side of the through-molding hole of the die. A plurality of sets of mold combinations are combined, and the plurality of sets of mold combinations are subjected to a powder filling stage, a powder measuring stage, and a powder pressurizing unit during one rotation period of the rotary table assembly. In a rotary type powder pressure molding apparatus adapted to be brought to a stage and a processed molded product collecting stage, a cylindrical cylindrical body having a through hole penetrating in the axial direction, wherein the die is provided on one end side in the axial direction. A die support part for fixed support is provided, and a lower punch combination means for supporting the lower punch movably in the axial direction is provided inside the cylindrical body, and the die and the lower punch corresponding to the form of a work to be formed are added to the die. The external setup holder includes an external setup holder that is axially aligned and supported outside the pressure forming apparatus in advance, and the external setup holder is an axially intermediate portion that is outside of the external setup holder. And a lower rotary table in the rotary table assembly, wherein the lower rotary table in the rotary table assembly is located below the first lower rotary table and the first lower rotary table. A second lower rotary table arranged in parallel with a space between the first and second lower rotary tables.
Lower rotary table has holes corresponding to the outer diameter of the external setup holder, and the second lower rotary table allows passage of a brim member in the external setup holder around the holes. The external setup holder includes a pair of keyways and a liner member provided at a predetermined angle position with respect to the keyways, and the outer setup holder is provided with the flange member from below the second lower rotary table. After being inserted in a state of being aligned with, the flange member passes through the key groove, the external setup holder is rotated, and the liner member is used to insert the external setup holder into the rotary table. It is intended to constitute a mold exchanging mechanism in a rotary type powder pressure molding apparatus which can be detachably set to an assembly.

[0008]

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. Figure 1
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. 6 is a vertical cross-sectional view showing a specific configuration example of a mold exchanging mechanism in the rotary powder pressure molding apparatus according to the present invention.

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 pressurization mechanisms 6 and 7 are provided on the machine base 5 at positions apart from the rotary shaft 2. The machine body 3 includes a cabin housing 8 extending on the machine base 5, and a front wall of the cabin housing 8 is provided with a window opening 9 corresponding to the entire portion of the rotary table assembly 4. 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, the intermediate rotary table 12, the first lower rotary table 13 and the second lower rotary table 14. The main rotary system in the apparatus including the rotary table assembly 4 is, for example, a worm wheel 15 attached to the rotary shaft 2,
A worm gear 16 meshing with the worm wheel 15,
The variable speed reduction mechanism 17 and the rotary power source 18 are configured to rotate at an appropriately set rotational speed.

In the present invention, the mold assembly 20 is supported by the die 21 having a through-molding hole 22 extending in the axial direction and the upper rotary table 11 side, and the through-molding hole 22 of the die 21 is formed. The upper punch 23 combined so as to enter the die 21 from above, the first punch 23
At least one lower punch supported by the lower rotary table 13 and the second lower rotary table 14 side of the die 21 and combined so as to enter into the die 21 from the lower side of the through-molding hole 22 of the die 21. And 24.

Next, the mold exchanging mechanism according to the present invention will be described in detail with reference to FIG. According to the specific example shown in FIG. 2, the lower punch 24 includes a core punch 25. In this invention,
The mold changing mechanism is constituted by an external setup holder 26. The external setup holder 26 is a cylindrical tubular body having a through hole 27 penetrating in the axial direction, and has a die supporting portion 28 for supporting the die 21 at one end side in the axial direction. The die 21 can be integrally attached by the means. The die 21 has a diameter portion 21a that fits into a hole 12a provided in the intermediate rotary table 12, and a flange portion 2 that abuts the lower surface of the intermediate rotary table 12 when the external setup holder 26 is set.
It has 1b.

In the present invention, a combination means 35 for combining the lower punch 24 and the core punch 25 with the external setup holder 26 will be described. The lower punch 24 and the core punch 25 are concentrically combined with each other inside the external setup holder 26, and are individually slidable along the axial direction. The lower punch 24 has a forming punch portion 24a on one end side. The forming punch portion 24a has an outer diameter that slidably fits into the through-molding hole 22 of the die 21, and has an inner diameter that slidably fits into the outer diameter of the core punch 25. It has a hole 29. The core punch 25 has a core punch portion 25a on one end side. The core punch section 25a is
The outer diameter is slidably fitted in the through hole 29 of the lower punch 24 and slidably fitted in the through hole 30 of the upper punch 23.

Further, according to the specific construction of the external setup holder 26, the lower punch 24 is provided with the connecting portion 24b on the other end side, and the cap nut 31 and the seat member 3 are provided.
It is connected to the lower punch holder 33 via 2. The core punch 25 has a connecting portion 25b on the other end side and is connected to the core punch holder 34.

The lower punch 24 and the core punch 25 are assembled to the external setup holder 26 by the assembly pin member 35a via the lower punch holder 33 and the core punch holder 34. The assembly pin member 35a includes a pin hole 36 provided in the external setup holder 26, an elongated hole 37 extending in the axial direction provided in the lower punch holder 33, and the core punch holder 3.
4 is inserted into the pin hole 38 provided in the No. 4, and the core punch holder 34 is integrally connected to the external setup holder 26. The assembly pin member 35a is rotatable around the support pin 39, and includes a stopper pin 40a.
The fall-prevention plate 41 positioned by means prevents the fall-off prevention plate 41 from coming off in a state where it is positioned by the stopper pin 40.

Further, in the present invention, the external setup holder 26 is a middle portion in the axial direction, and is provided with a pair of brim members 42, 42 on the outer peripheral portion thereof, which extend in the diametrically outward direction in the opposite direction. ing. On the other hand, in the second lower rotary table 14, the hole 43 corresponding to the outer diameter of the external setup holder 26 and the brim member 4 are formed.
A pair of key grooves 44, 44 for allowing the insertion of 2, 42 are provided, and the first lower rotary table 13 is provided with a hole 45 corresponding to the outer diameter of the external setup holder 26. Further, a pair of liner members 46, 46 is attached to the second lower rotary table 14.
The pair of liner members 46, 46 has a liner surface 46a for accurately supporting the brim members 42, 42 of the external setup holder 26 in the axial direction. As is well known, the liner surface 46a of the liner member 46 is a surface with extremely high accuracy and is inclined slightly upward in the counterclockwise direction in the drawing. Of the pair of liner members 46, 46, one liner member 46 functions as a stopper that contacts the brim member 42. In the embodiment shown in the drawings, the one liner member 46 has a protruding portion 46 that protrudes upward from the liner surface 46a on one end side of the liner surface 46a.
b, and the stopper surface 4 is formed by the protrusion 46b.
6c is formed. That is, the external setup holder 26 is inserted into the hole 43 from the lower side of the second lower rotary table 14, allows the brim member 42 to pass through the key groove 44, and rotates counterclockwise in the example shown in FIG. 3A. By bringing the brim member 42 into contact with the liner member 46, the rotation direction is regulated, and at this stage, the external setup holder 26 is rotated counterclockwise and the liner surface 46a of the liner member 46 is rotated. Along the axial direction, the flange portion 21b of the die 21 disposed on the upper end side of the external setup holder 26 is axially fixed while abutting the intermediate rotary table 12, and is fixed to the pressure molding device. Is installed.

Next, a 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, the desired lower punch 2
4 is attached to the lower punch holder 33 via the cap nut 31 and the seat member 32. At the same time, if necessary, the core punch 25 is attached to the core punch holder 34.
As shown in FIG. 4, the external setup holder 26 is installed on the external setup table 50 prepared outside the machine body. The lower punch holder 33 prepared as described above is inserted from below the external setup holder 26. In this case, the lower punch holder 33
Is axially positioned with respect to the external setup holder 26 by a height determining jig (not shown) applied to the lower end side thereof.

When the core punch 25 is required, the core punch 25 set in the core punch holder 34 is used.
Is inserted from the lower side of the lower punch holder 33, and the pin hole 36 provided in the external setup holder 26 and the elongated hole 3 extending in the axial direction provided in the lower punch holder 33.
7, pin hole 38 provided in the core punch holder 34
Align and insert the assembly pin member 35a,
The core punch holder 34 is integrally connected to the external setup holder 26.

The external setup holder 26 assembled outside the machine body as described above is put into a separately prepared storage cylinder and put into a standby state.

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 storage cylinder in the standby state is taken out from the storage cylinder, and is inserted into the hole 43 from the lower side of the second lower rotary table 14 in the rotary pressure molding apparatus. After the insertion, as shown in FIG. 3B, the external setup holder 26 is turned by the hooking wrench 52 to securely fix it in the axial direction and the radial direction.

Further, in the mold exchanging mechanism according to the present invention, the lower punch and the core punch assembled to the machine body through the external setup holder 26 can be exchanged very easily even in the assembled state. . In this case, first, the wading cam in the lower cam mechanism 53 for the lower punch and the core punch is removed, and the core rod screw collar 51 is attached to the core punch holder 34.
To the bottom of the. In this state, the assembling pin member 35a is pulled out, and is pulled downward together with the lower punch holder 33 (while the core punch holder 34 is set). At the time of resetting, by placing the core rod screw collar 51 on the axial positioning jig, the lower punch holder 33 with the core punch holder 34 set can be positioned on the external setup holder 26. The resetting is completed by inserting the assembly pin member 35a. Further, in the present invention, the core punch holder 34
Only the core punch can be removed and replaced via.

[0022]

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 device, and its mounting operation can be performed extremely easily and with extremely high precision, and die changes must be frequently performed with the development of small lots and a wide variety of products. Even in such a case, it can be said that the downtime of the apparatus required for the die replacement can be shortened as much as possible, and the working efficiency for powder pressure molding can be improved very effectively.

[Brief description of drawings]

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

FIG. 2 is a schematic vertical cross-sectional view showing a specific configuration example of a mold exchanging mechanism in the rotary powder pressure molding apparatus according to the present invention.

3A is a schematic cross-sectional view taken along the line AA in FIG. 2 and FIG. 3B is a schematic cross-sectional view taken along the line BB in FIG. FIG. 3C is a schematic side view seen from the arrow C in FIG. 2.

FIG. 4 is an external view for a standby setting by combining a lower punch 24 and a core punch 25 with an external setup holder 26 in the mold exchanging mechanism in the rotary type powder pressure molding apparatus according to the present invention. It is a schematic perspective view which shows the specific example of a setup table, and its procedure aspect.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rotary powder pressure molding apparatus 2 rotary shaft 3 machine body 4 rotary table assembly 5 machine base 6, 7 pressurizing mechanism 8 cabin housing 11 upper rotary table 12 intermediate rotary table 13 first lower rotary table 14 second Lower rotary table 20 Mold combination 21 Die 22 Through-molding hole 23 Upper punch 24 Lower punch 25 Core punch 26 External setup holder 28 Die support 33 Lower punch holder 34 Core punch holder 35 Lower punch combination means 42 Flange member 44 Key groove 46 Liner member 50 External setup table

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B30B 11/08 Z

Claims (1)

[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, With respect to the rotary table assembly, a die having an axially extending through-molding hole that is positioned on the intermediate rotary table, and a die that is supported on the upper rotary table side and is located above the through-molding hole of the die. From an upper punch combined so as to enter into the die and a lower punch supported so as to enter the die from the lower side of the through-molding hole of the die, the upper punch being combined so as to enter the die. A plurality of sets of mold combinations are combined, and the plurality of sets of mold combinations are powder-filled during one rotation period of the rotary table assembly. A cylindrical tube having a through hole (27) penetrating in an axial direction in a rotary type powder pressure molding apparatus adapted to be brought to a stage, a powder measuring stage, a powder pressure stage and a processed molded product collecting stage. A lower punch for supporting the lower punch (24) inside the cylinder so as to include a die support portion (28) for fixedly supporting the die (21) on one end side in the axial direction. A die (21) and a lower punch (24) having a combination means (35) according to the form of a work to be formed.
An external setup holder (26) for axially preliminarily aligning and supporting the same outside the pressure molding apparatus in an axially aligned state. The external setup holder (26) is an intermediate portion in the axial direction. And a pair of brim members (42) and (42) extending outward in the radial direction in the outer peripheral portion of the lower rotary table in the rotary table assembly (4). Lower turntable (13) and said first
Second lower rotary table (14) arranged below the lower rotary table (13) in parallel at a distance from each other, wherein the first and second lower rotary tables are the external setup holders. The second lower rotary table (14) has holes (45) and (43) respectively corresponding to the outer diameter of (26), and the second lower rotary table (14) has the external setup holder (26) around the hole (43). Brim member (42)
And a liner member (46) provided at a predetermined angular position with respect to the key groove (44), which allows the passage of the external setup holder (44). 26) is the brim member (42) from below the second lower rotary table (14).
Is inserted in alignment with the key groove (44), and after the brim member (42) passes through the key groove (44), the external setup holder (26) is rotated to rotate the brim member ( 42) through the liner member (46)
Thus, the mold exchanging mechanism in the rotary powder pressure molding apparatus is characterized in that the external setup holder (26) can be detachably set to the rotary table assembly (4).