JPH0716796A - Die mechanism for rotary type powder press molding device - Google Patents

Abstract

PURPOSE:To provide the die mechanism of a rotary powder press molding device capable of. surely taking out press molded goods in a way as not to generate damages at a stage for taking out the press molded goods. CONSTITUTION:This die mechanism consists of a die 21 having a through- molding hole 22, and an upper punch 23 and lower punch assembly 24 which can be advanced into the through-molding hole 22 of the die from both sides thereof. The lower punch assembly 24 includes a first lower punch 25, second lower punch 26 and core punch 27 which are respectively discretely movable along an axial direction. The lower punch assembly is provided with an actuation mechanism to move the first lower punch 25 and the second lower punch 26 at the same level and the same stroke from the time for pressurizing a power material PM until the time for taking out the molded products W formed by press molding and to push out the molded products by the second lower punch 26 in the final removing stage of the molded products.

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. Especially, in the improvement of the lower punch assembly, regarding the powder material filling stage, the pressure stage, and the pressure molded product take-out stage,
A mold mechanism in a rotary powder pressure molding device that operates extremely effectively, and in particular, can be reliably taken out so that the pressure molded product is not damaged at the stage for taking out the pressure molded product. Is.

[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 press apparatus, and the die and the pair of upper and lower punches support an intermediate rotary table for supporting the die and the upper punch. The upper rotary table and the lower rotary table supporting the lower punch, respectively, and a filling process in a powder material filling stage, a weighing process in a powder material measuring stage, and a powder during a rotation period of the rotary table. The powder material pressure-molded product is obtained through a pressing process in the body material pressing stage and a taking-out process in the processed molded product taking-out stage.

In the rotary type powder pressure molding apparatus having the above-mentioned structure, the powder material pressure molded product W as shown in FIG. 1C, that is, the one end W _a in the axial direction is terminated by the end surface W _A. The first diameter portion D _L and the other end W _b in the axial direction are continuous with the first diameter portion D _L via the stepped surface W _C , and end at the end surface W _B. Has a diameter portion D _S ,
When a molded product W having a central hole P penetrating in the axial direction is to be pressure-molded, after the pressure molding, at the stage of taking out the pressure-processed molded product, especially when the second diameter portion D _S is Although it has a big problem that it is damaged, and attempts have been made to solve it, an effective and rational lower punch such as the structure of the lower punch assembly becomes extremely complicated. It did not reach the assembly mechanism.

[Problems to be Solved by the Invention]

In view of the above, the present invention has drawbacks and problems in the above-described conventional rotary type powder pressure molding apparatus when the powder material pressure molding product W as shown in FIG. 1C is pressure molded. In order to eliminate the problem as much as possible, the powder material filling stage, the pressure stage, and the pressure-molded product take-out stage operate extremely effectively, and particularly, the pressure-molded product take-out stage. In order to provide a mold mechanism in a rotary powder pressure molding apparatus, which can be taken out surely without damaging a pressure molded article.

[0006]

In order to achieve the above-mentioned object, the present invention is specifically, one end side W in the axial direction.
_a , a first diameter portion D _L terminating at the end surface W _A , and a stepped surface W _L on the other end side W _b in the axial direction with respect to the first diameter portion D _L.
A molded product W that is continuous through _C and has a second diameter portion D _S that terminates at the end face W _B and that has a central hole P that penetrates in the axial direction is formed into a powder material by pressure molding. A rotary powder pressure molding apparatus for molding by means of a die having a through-molding hole having a diameter corresponding to the diameter of the first diameter portion D _L of the molded product W, and a through-molding hole of the die. It consists of an upper punch and a lower punch assembly that enter into the die through-molding hole from both sides and pressurize the powder material filled in the die through-molding hole, and the upper punch is from above the die. The lower punch assembly includes a molding surface that enters the through-molding hole and molds the end surface W _A of the molded product W.
It includes a first lower punch, a second lower punch, and a core punch that are individually movable along the axial direction, and the first lower punch is of the second diameter portion D _S of the molded product W. A molding surface having a through-molding hole having a diameter corresponding to the diameter and entering the through-molding hole from below the die to mold the second diameter portion D _{S and the} stepped surface W _C of the molded product W. Equipped with
The second lower punch has a through-molding hole having a diameter corresponding to the diameter of the central hole P of the molded product W, and enters the through-molded hole of the first lower punch to allow the molded product W The core punch has a molding surface for molding the end surface W _B ,
And a molding surface which has an outer diameter for forming the central hole P of the molded product W and enters the second lower punch to form the central hole P of the molded product W, with respect to the lower punch assembly. Then, the first lower punch and the second lower punch are moved at the same level and the same stroke from when the powder material is pressed to when the molded product is extruded, and the second lower punch is molded when the molded product is finally extracted. The present invention constitutes a metal mold mechanism in a rotary type powder pressure molding apparatus provided with a molded product takeout mechanism adapted to extrude a product.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The mold mechanism of the rotary type 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
1A shows a concrete example of the structure of a mold mechanism in a rotary powder pressure molding apparatus according to the present invention.
FIG. 1B is a schematic vertical sectional view of the whole thereof, FIG. 1B is a schematic side view of a developed form showing a form of a ring cam directly connected to the first and second lower punches, and FIG. 1C is a powder. FIG. 2 is a schematic side sectional view showing a specific form of the pressure-formed product W, and FIG. 2 is a schematic vertical cross-sectional view showing an operating mode of a die mechanism in the rotary powder pressure-forming apparatus according to the present invention. FIG. 3 is a plan view, and FIG. 3 is a schematic front view of an apparatus showing a basic configuration of a rotary type powder pressure molding apparatus to which the present invention is applied.

In the present invention, as shown in FIG. 3, the rotary powder pressure molding apparatus 1 basically has a machine body 3 having one rotating shaft 2 extending in the vertical direction, and the rotating shaft 2 described above. And the turntable assembly 4 assembled to the. 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 vertically operated by an external operation,
A shutter 10 for opening and closing the window opening 8 is combined.

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 figure, reference numeral CM indicates a lower cam mechanism for a die mechanism including a core punch.

In the present invention, the die mechanism 20 is supported by the die 21 having the through-molding hole 22 extending in the axial direction and the upper rotary table 11 side, and is above the through-molding hole 22 of the die 21. Is supported by the upper punch 23 and the lower rotary tables 13 and 14 which are combined so as to enter into the die 21, and enters into the die 21 from below the through-molding hole 22 of the die 21. As described above, the lower punch assembly 24 is composed of a combination of the first lower punch 25, the second lower punch 26, and the core punch 26 that are individually movable.

In the embodiment shown in the drawings, the molded product W has a first diameter portion D which is terminated at the end face W _A at one end side W _a in the axial direction.
_L and a second diameter portion D _S that is continuous with the other end side W _b in the axial direction with respect to the first diameter portion D _L via a stepped surface W _C and terminates at an end surface W _B. If it has a central hole P penetrating in the axial direction, the die 21 of the mold mechanism 20 has a through-molding hole having a diameter corresponding to the diameter of the first diameter portion D _L of the molded product W. It has a 22
It is attached to the die plate DP. In contrast, the upper punch 23 in the die mechanism 20 is composed of those with shaped surfaces 23a for molding the end face W _A of said molded article W. On the other hand, the first lower punch 25 is used for the molded product W.
A diameter corresponding to the diameter of the second diameter portion D _S of the through molded hole 25 for forming the second diameter portion D _S of the molded product W
a and a molding surface 25b for molding the stepped surface W _C of the molded product W. The second lower punch is provided with a through-molding hole 26a having a diameter corresponding to the diameter of the center hole P of the molded product W, and enters the through-molded hole of the first lower punch to form the molded product W. And a molding surface 26b for molding the end surface W _B of the. The core punch 27 has an outer diameter for forming the center hole P of the molded product W, and has a molding surface 27a that enters the second lower punch and forms the center hole P of the molded product W. It consists of

Next, the mold mechanism according to the present invention will be described in detail with reference to FIG. 1A. According to the specific example shown in FIG. 1A, the first lower punch 25 includes a connecting portion 28 at a lower end thereof, and includes a cap nut 29 and a seat member 3.
It is connected to the first lower punch holder 31 via 0. The lower end of the first lower punch holder 31 has a first
A lower punch ring cam member 32 is attached. The first lower punch ring cam member 32 has a ring cam 33 extending in the axial direction on the lower surface thereof. The ring cam 33 is composed of, for example, rectangular wave convex portions 33a (rectangular wave concave portions 33b) that project in the axial direction at an angular pitch of 11.25 ° (one round 32 equal parts). The first lower punch ring cam member 32 is provided with a cam follower 34 extending in the radial direction on the outer peripheral surface thereof. The first lower punch 25 is
During rotation of the rotary table assembly 4 to which the mold mechanism is attached, the cam follower 34, the first lower punch ring cam member 32, and the first lower punch ring cam member 32 are regulated by the cam surface CS1 provided on the machine side. The lower punch holder 31 can be displaced in the axial direction.

On the other hand, the second lower punch 26 has a connecting portion 35 at the lower end thereof, and has a cap nut 36 and a seat member 37.
Is connected to the second lower punch holder 38 via. A second lower punch ring cam member 39 is rotatably attached to the intermediate outer peripheral portion of the second lower punch holder 38. The second lower punch ring cam member 39
Has a ring cam 40 extending in the axial direction on its upper surface. The ring cam 40 is composed of, for example, a rectangular wave convex portion 40a (rectangular wave concave portion 40b) that protrudes in the axial direction at an angular pitch of 11.25 ° (around 32 equal parts). The second lower punch ring cam member 39 is provided with a cam follower 41 extending in the radial direction on the outer peripheral surface thereof. The second
The lower punch 26 is restricted by the cam surface CS2 provided on the machine side during the rotation period of the rotary table assembly 4 to which the mold mechanism is attached, and the cam follower 41,
The second lower punch ring cam member 39 and the second lower punch holder 38 can be used for axial displacement.

The core punch 27 has a connecting portion 42 at its lower end, and is connected to the core holder 43 via the connecting portion 42.

Next, the operation mode of the die mechanism in the rotary type powder pressure molding apparatus according to the present invention will be described in detail with reference to FIGS. 2A and 2B. First, FIG. 2A shows a state in which the die changes with time in the operation mode of the die mechanism. The filling stage S _F for filling the powder material PM into the die, the upper punch and the lower punch in order from the left side. 1 shows the states of a pressure stage S _P for pressing the powder material PM in the die mold by the punch assembly and a molded product take-out stage S _T for taking out the molded product W that has been pressure-formed.
In particular, the molded product take-out stage S _T is divided into three stages of a first extrusion stage S _T 1, a second extrusion stage S _T 2 and a final extrusion stage S _T F. Figure 2B
Is an operation mode of a molded product take-out mechanism for taking out a press-formed molded product W composed of a first lower punching cam member, a second lower punching cam member, and the like.
The state of meshing is shown in correspondence with the time-dependent change of the mold in each stage.

First, in FIGS. 2A and 2B, in the powder material PM filling stage S _F , the first lower punching cam member 32 and the second lower punching cam member 38 are axially separated from each other. The first lower punch 25 is in the position, the first lower punch 25 is in the first position, and the second lower punch 26 is in the first position. In this state, the powder material PM is filled.
On the pressure stage S _P , the second lower punch ring cam member 38 moves upward in the axial direction with respect to the first lower punch ring cam member 32, and the convex portions of each ring cam member come into abutting contact with each other. Therefore, the first lower punch 25 is in the first position, while the second lower punch 26 is in the second position.
It is moved to the position of and is positioned. In this state, the upper punch 23 descends to press-mold the powder material PM. In the molded product take-out stage S _T , the extrusion first stage S
During the period of _T 1 and the second step S _T 2 of extrusion, the first lower punch ring cam member 32 and the second lower punch ring cam member 38 abutted against each other so that the convex portions of each ring cam member abut each other. In the state, it moves upward in the axial direction. This state continues until the upper end forming surface 25b of the first lower punch 25 is flush with the die top surface 21a, that is, the first lower punch 25 reaches the second position. At this time, the second lower punch 26 takes the third position. From this state to the state of the final stage of extrusion S _T F in the molded product take-out stage S _T , the first lower punch ring cam member 3 is pressed.
On the other hand, the second lower punching cam member 38 rotates in the direction of the arrow to move the first lower punching cam member 32,
The second lower punch ring cam member 38 shifts to the meshed state, the second lower punch 26 takes the fourth position, and the press-formed molded product W is taken out.

[0017]

The mold mechanism in the rotary type powder pressure molding apparatus of the present invention having the above-described structure has the first lower punch 25 and the second lower punch 26 in the mold mechanism. The lower part of the lower punching cam member 32, the second lower part of the punching cam member 38, and the like are provided with a molded product take-out mechanism PM for taking out the press-formed molded product W. Works reasonably,
It can be said that when the pressure-formed molded product W is taken out, the pressure-formed molded product W can be reliably taken out without damaging the pressure-formed molded product W, which can be said to be extremely effective.

[Brief description of drawings]

FIG. 1 shows a specific structural example of a die mechanism in a rotary type powder pressure molding apparatus according to the present invention, and FIG. 1A is a schematic vertical sectional view of the whole. Figure 1
FIG. 1B is a schematic side view of a developed state showing a form of a ring cam directly connected to the first and second lower punches, FIG.
C is a schematic side sectional view showing a specific form of the powder pressure-formed product W.

FIG. 2 is a view for explaining an operation mode of the mold mechanism in the rotary powder pressure molding apparatus according to the present invention, and FIG. 2A shows an operation mode of the mold mechanism.
It shows the state of change over time of the mold, from the left side,
The filling stage S _F for filling the powder material PM into the die, and the powder material P in the die die by the upper punch and the lower punch assembly.
The figure shows the states of a pressure stage S _{P for} pressing M and a molded product take-out stage S _T for taking out a molded product W that has undergone pressure molding. Particularly, the molded product take-out stage S _T is the first stage of extrusion. S _T 1, extrusion second stage S
FIG. 2B is a schematic side sectional view showing three stages of _T 2, the final stage of extrusion S _T F, and FIG. 2B is composed of a first lower punch ring cam member, a second lower punch ring cam member, and the like. FIG. 8 is a schematic side view showing an engagement state of an operating mode of a molded product take-out mechanism for taking out a press-molded molded product W, corresponding to a temporal change of a mold in each stage.

FIG. 3 is a schematic front view of an apparatus showing a basic configuration of a rotary type powder pressure molding apparatus to which the present invention is applied.

[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 pressure mechanism 11 upper rotary table 12 intermediate rotary table 13 first lower rotary table 14th 2 lower rotary table 20 mold mechanism 21 die 22 die through-molding hole 23 upper punch 24 lower punch assembly 25 first lower punch 26 second lower punch 27 core punch 31 first lower punch holder 32 first lower Punch ring cam member 33 First lower punch rectangular wave ring cam portion 34 First lower punch cam follower 38 Second lower punch holder 39 Second lower punch ring cam member 40 Second lower punch rectangular wave ring cam portion 41 Second lower punch cam follower 43 core punch holder PM powder material W powder pressing products S _F filling stearyl the Stage S _P Pressing stage S _T Mold ejection stage S _T 1 Extrusion 1st stage S _T 2 Extrusion 2nd stage S _T F Extrusion final stage

Claims (1)

[Claims] 1. _A first diameter portion D _L terminating at an end face W _A at one end W _a in the axial direction, and the first diameter portion D _L at the other end W _b in the axial direction.
With a second diameter portion D _S which is continuous with the diameter portion D _L of the end portion of the inner surface through the stepped surface W _C and ends at the end surface W _B , and which has a central hole P penetrating in the axial direction. A rotary powder pressure molding apparatus for molding a product W by a pressure molding process of a powder material, comprising: a through molding hole having a diameter corresponding to the diameter of the first diameter portion D _L of the molding product W. From a die provided, and an upper punch and a lower punch assembly that enter the die through-molding hole from both sides of the die through-molding hole and press the powder material filled in the die through-molding hole. The upper punch has a forming surface that enters the through-forming hole from above the die to form the end surface W _A of the formed product W, and the lower punch assembly is arranged along the axial direction. Includes a first lower punch, a second lower punch, and a core punch that are individually movable. Said first lower punch, the second diameter portion D of the molded product W
A through molding hole having a diameter corresponding to the diameter of _S is provided, and the second diameter portion D _S of the molded product W and the stepped surface W _C are molded by entering the through molding hole from below the die. The second lower punch has a molding surface, and the second lower punch has a center hole P of the molding product W.
A through-molding hole having a diameter corresponding to that of the first lower punch is inserted into the through-molding hole of the first lower punch to form an end surface W of the molded product W.
Comprising a molding surface for molding the _B, the Koapanchi has an outer diameter forming a center hole P of the molded article W, enters into the second lower punch, the center hole P of the molded product W The first lower punch and the second lower punch are provided to the lower punch assembly at the same level and the same stroke from when the powder material is pressed to when the molded product is extruded. A mold mechanism in a rotary powder pressure molding apparatus, characterized in that a molding product take-out mechanism is provided which is configured to be extruded by the second lower punch when the molding product is finally extracted.