JP2003136297A - Pressure mechanism in rotary press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure mechanism by which reliability at a pressing process in a rotary press for solidifying and forming a powder material such as ceramic by pressurization is improved. SOLUTION: The rotary press has a plurality of sets of die assemblies composed of a rotary table assembly 4, a die 21, an upper punch 23 and a lower punch 24, and the press working of a powder material to be worked in the die is performed by pressing the upper punch by an upper pressure means 6 and the lower punch by a lower pressure means 7 respectively in the axial direction. This pressure mechanism in the rotary press has pressurization blocks 33, 37 provided with a comparatively wide and flat pressurization surface are arranged between each of pressure means 6, 7 and the side of a pressurization end in each of punch holders 26, 27.

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, so-called rotary. The present invention relates to a press, and more particularly, to a punch pressurizing mechanism for pressing an upper punch and a lower punch in mutually facing directions in order to press the powder to be processed in a die.

[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, by 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. It is configured.

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, A powder material pressure-molded product is obtained through a pressure step in the powder material pressure stage and a 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. A plurality of sets of mold combinations, each of which is aligned on one axis, and combined with the rotary table assembly, and the powder material is added during the rotation period of the rotary table assembly. During the pressurizing step in the pressure stage, the upper punch and the lower punch are pressed in the directions facing each other to press the powder to be processed in the die.

In the conventional rotary press machine, a roller system operated by an eccentric cam mechanism has been adopted as a pressurizing means for pressing the upper punch and the lower punch in the directions facing each other. In the case of this roller type pressurizing mechanism, since the mold combination is configured to pass through the pressurizing mechanism during the rotation period of the rotary table assembly, in the roller type pressurizing mechanism, There is a problem that the pressure contact point is small and the pressure contact time is short, so that an effective pressure processing cannot be performed.

Furthermore, in the pressing mechanism in the conventional rotary type powder pressure molding apparatus, a load cell is installed in association with the eccentric shaft for pressurization, and the eccentric shaft for pressurization is displaced. Is detected to measure the pressing force, and the indirect pressing force is only detected.

Therefore, the present invention is intended to eliminate the drawbacks and problems of the pressing mechanism in the conventional rotary type powder pressure molding apparatus described above as reliably as possible. To provide an extremely effective punch pressure mechanism for pressing an upper punch and a lower punch in directions facing each other in order to press work powder to be processed in a die.

[0009]

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 composed of an upper rotary table, an intermediate rotary table and a lower rotary table which are assembled so as to rotate integrally in parallel with each other.
A die having an axially extending through-molding hole, which is supported by the intermediate rotary table, and the upper rotary table through the upper punch holder so as to enter into the die from above the through-molding hole of the die. A plurality of sets of molds including a combined upper punch and a lower punch combined with the lower rotary table via a lower punch holder so as to be located in the die from the lower side of the through-molding hole of the die. A rotary press for pressing the powder to be processed in the die by axially pressing the upper punch by the upper pressing means and the lower punch by the lower pressing means. A rotary press having a pressing block having a relatively wide flat pressing surface disposed between the pressing means and the pressing end side of each punch holder. It constitutes a pressurizing mechanism in the space.

Further, according to the present invention, the pressing mechanism in the rotary press is also constituted by providing a plurality of grooves on a relatively wide flat pressing surface of the pressing block.

Still further, according to the present invention, a pressing mechanism in a rotary press is constructed by disposing a load cell between the upper pressing means and the upper punch pressing block.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A pressure mechanism in a rotary press according to the present invention will be described below in detail with reference to specific embodiments shown in the drawings. FIG. 1 is a front view of an apparatus showing an outline of a basic configuration of a rotary press to which the present invention is applied. FIG. 2 is a vertical cross-sectional view showing details of a specific configuration example of a pressing mechanism in the rotary press according to the present invention, and FIG. 3A is a schematic cross-sectional view taken along the line AA in FIG. Yes, FIG. 3B is a schematic bottom view seen in the direction of arrow C in FIG. 3A. On the other hand, FIG. 4A is a schematic sectional view taken along line BB in FIG. 2, and FIG. 4B is a schematic plan view seen in the direction of arrow D in FIG. 4A.

In the present invention, the rotary press 1
Basically, it is provided with a machine body 3 having one vertical rotary shaft 2 and a rotary table assembly 4 assembled to the rotary shaft 2. 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. The machine body 3 is the machine base 5
A cabin housing 8 extending upward is provided, and a window opening corresponding to the entire part of the rotary table assembly 4 is provided on a front wall of the cabin housing 8.
A suitable opening / closing door is combined with the window opening.

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 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 the inside of the die 1, and at least one lower punch 24 combined so as to be located in the die 21 from the lower side of the through molding hole 22 of the die 21. .

The upper punch 23 is provided with a forming punch portion for forming the upper surface side of a press-formed product on one end side and an upper punch holder 26 on the other end side. The number of the upper punches 23 is the same as the number of the dies 21, and the upper punches 23 are concentrically located on the extension lines of the axial lines of the through-molding holes 22 in the dies 21, respectively. The upper punch holder 2 so that the upper punch holder 2 can enter from above.
It is combined with the upper rotary table 11 via 6.

On the other hand, the lower punch 24 is provided with a forming punch portion for forming the lower surface side of the pressure-formed product on one end side and a lower punch holder 27 on the other end side. ing. The number of the lower punches 24 is the same as the number of the dies 21, and the lower punches 24 are concentrically located on the extension lines of the axes of the through-molding holes 22 in the dies 21, respectively. On the other hand, the lower rotary table 1 is placed via the lower punch holder 27 so as to be positioned on the lower side thereof.
Combined with 1.

Next, the punch pressing mechanism 28 in the rotary press according to the present invention will be described. The punch pressurizing mechanism 28, between the upper punch 23 and the lower punch 24, the position where the die 21 enters the through-molding hole 22 and the position where the die 21 retreats to the outside of the through-molding hole 22, Each of them reciprocates along a shaft to press the powder to be pressed in the through-molding hole 22 of the die 21, and includes an upper punch pressing mechanism 6 and a lower punch pressing mechanism 7. It consists of things.

In the present invention, the upper punch pressing mechanism 6 includes an upper eccentric shaft 29, and an eccentric shaft portion 30 of the upper eccentric shaft 29 and the upper punch holder 2 are included.
6, a load cell 31, a backing plate 32, and an upper pressure block 33 are arranged. The upper pressing block 33 has a relatively wide flat pressing surface 33a, and the pressing surface 33a directly contacts the pressing end side 26a of the upper punch holder 26.

In a more preferable example of the present invention, a relatively wide flat pressing surface 3 of the upper pressing block 33 is provided.
3a is provided with a plurality of grooves 34 for the purpose of preventing wear.

On the other hand, the lower punch pressing mechanism 7 includes a lower eccentric shaft 35, and is provided between the eccentric shaft portion 36 of the lower eccentric shaft 35 and the lower punch holder 27. The lower pressure block 37 is provided. The lower pressing block 37 has a relatively wide flat pressing surface 37a, and the pressing surface 37a directly contacts the pressing end side 27a of the lower punch holder 27.

Similarly to the above, in a more preferable example of the present invention, a plurality of grooves 38 are provided on the relatively wide flat pressure surface 37a of the lower pressure block 37 for the purpose of preventing wear.

[0023]

According to the pressurizing mechanism in the rotary press of the present invention having the above-mentioned structure, the rotary die is constructed so that the mold assembly passes through the pressurizing mechanism during the rotation period of the rotary table assembly. When applied to the press,
By maintaining a pressing block with a relatively wide flat pressing surface between each pressing means and the pressing end side of each punch holder, the pressing time is kept average and long. It can be said that the pressure-pressing effect can be enhanced in that it can be achieved, and in that respect, it can be said to act extremely effectively.

Further, according to the pressing mechanism in the rotary press according to the present invention, the load cell is arranged between the upper pressing means and the upper punch pressing block, so that the object to be pressed is pressed. It can be said that it works extremely effectively in that the pressure can be directly measured and detected in the pressing axis direction.

[Brief description of drawings]

FIG. 1 is a front view of an apparatus showing an outline of a basic configuration of a rotary press to which the present invention is applied.

FIG. 2 is a vertical cross-sectional view showing details of a specific configuration example of a pressing mechanism in the rotary press 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 bottom view seen in the direction of arrow C in FIG. 3A.

4A is a schematic cross-sectional view taken along line BB in FIG. 2, and FIG. 4B is a schematic plan view seen in the direction of arrow D in FIG. 4A.

[Explanation of symbols]

1 Rotary press 2 rotation axes 3 aircraft 4 Rotary table assembly 5 units 6 Upper pressure mechanism 7 Lower pressure mechanism 11 Upper rotary table 12 Intermediate rotary table 13 First lower rotary table 14 Second lower rotary table 20 mold combination 21 dice 22 Through hole 23 Upper punch 24 Lower punch 25 core punch 26 Upper punch holder 27 Lower punch holder 28 Punch pressure mechanism 29 Upper eccentric shaft 31 load cell 33 Upper pressure block 34 Anti-wear groove 35 Lower eccentric shaft 37 Lower pressure block 38 Anti-wear groove

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 rotate integrally with each other in parallel with each other at a predetermined interval in the axial direction with respect to the rotary shaft, and an axial direction. A die having a through-molding hole extending to the intermediate rotary table and a die supported from the upper side of the through-molding hole of the die and combined with the upper rotary table via an upper punch holder so as to enter the die. A plurality of sets of die combinations each including an upper punch and a lower punch that is combined with the lower rotary table through a lower punch holder so as to be positioned in the die from the lower side of the through-molding hole of the die. The upper punch is pressed by the upper pressing means, and the lower punch is pressed by the lower pressing means in the axial direction,
In a rotary press for pressing powder to be processed in a die, a pressure block having a relatively wide flat pressure surface is arranged between each pressure means and the pressure end side of each punch holder. A pressurizing mechanism in a rotary press, which is characterized in that 2. The pressing mechanism for a rotary press according to claim 1, wherein a plurality of grooves are provided on a relatively wide flat pressing surface of the pressing block. 3. The pressure in the rotary press according to claim 1, wherein a load cell is arranged between the upper pressure means and the upper punch pressure block. mechanism.