JP2557441B2 - Powder molding equipment - Google Patents

Description

The present invention relates to a tubular part such as a valve part, which has a concave surface or a convex surface on the inner diameter side in the direction of the press spindle, and compresses the powder material. The present invention relates to a powder molding device for molding.

[Conventional technology]

As a device for making unevenness on the inner and outer diameter surfaces of a molded product at the same time as compression molding of a powder material, JP-A-60-97733 and U.S. Pat.
o.4087221, Hganas Hand Book {Publisher: HGANAS-B
ILLBS HOLMS (Sweden), Year of issue: 1958.SPRING} F
Some are based on ig40 (the above three have unevenness on the outer diameter side of the molded product) and Fig39 (which has a concave surface on the inner diameter side of the molded product). The corresponding pages in Fig. 39 and 40 are PRSSING & TOOLING SECTION B, TOOL DESIGN CHAPT
ER 30 PAGE 51.

In addition to the above, some of the conventional techniques are disclosed in JP-A-60-108199.

[Problems to be Solved by the Invention]

Of the three mentioned in the preceding paragraph, the former three types of equipment make unevenness only on the outer diameter part of the molded product.
Since the device shown in Fig. 39 of the Hand Book has a semi-annular shaped product, the molded product can be taken out by pulling down the die after compression molding.However, these devices have a concave or convex surface midway in the axial direction on the inner diameter side. When used to process existing molded products, especially those with multiple uneven surfaces arranged at point symmetry positions, the protrusions and recesses that form the uneven surface interfere with the removal of the molded product. Not done.

On the other hand, the device disclosed in JP-A-60-108199 requires a separate device for operating the horizontal punch in a direction perpendicular to the press main axis, and it is difficult to form it only by using an existing general vertical press machine. . Further, the horizontal punch can be used only when the concave portion is formed on the outer diameter side.

The present invention has been made in view of these points, and an object thereof is to mold a tubular part having a concave surface or a convex surface on the inner diameter side by using an existing press machine, and further form a molded product into any shape. It is to be able to die-cut to a state where it can be taken out in the direction.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a powder molding apparatus having a die for forming a cavity, upper and lower punches, a core, etc., in which a part of a core or a lower punch arranged in the same direction as the press spindle is made independent. It is movably supported in the direction of the main axis of the press and at a right angle thereto, and a convex portion or a concave portion having a surface corresponding to the inner diameter side of the molded product is provided on the outer periphery of the powder molding portion of the independent member, and the independent member and With respect to the member inside thereof, the mutual constraining surface that keeps the independent member at the molding position at the compression completed position, and the fitting depth at which the mutual positions are matched by the relative movement in the press main axis direction is the height of the uneven portion or An escape portion to the core axial center side of the independent member, which is larger than the depth dimension, is formed. The applicant has already proposed the above configuration in Japanese Patent Application No. 62-32203.

However, in the device illustrated in the prior application, as shown in FIG. 7, the base plate 9 receives the outer core holder that descends with pressurization, and the compression is completed at this position. Therefore, even if the die 1 connected to the yoke plate (not shown) and the inner core 5 directly or indirectly connected to the yoke plate can be removed from the molded product by further pulling down the yoke plate from the compression completed position, The outer core 4, which is an independent member, is only retracted to the axial center side as shown in FIG. 8 due to the fitting of the inner core 5 in the relief portion 7 due to the lowering, and is left on the inner diameter side of the molded product A ′. Will end up. For this reason, the molded product has to be picked up upward and taken out, which makes continuous operation difficult.

In the present invention, in order to eliminate such inconvenience, the following configuration is added in addition to the above configuration.

That is, a fork is provided between the independent member and the base plate to block a descending path from the compression completion position of the independent member, and a die plate that moves integrally with the yoke plate retracts the fork from the descending path after completion of compression. Each wedge is provided. Further, the independent member and the member inside thereof are connected to the elevating means capable of lowering them independently to the extraction position from the molded product.

[Action]

Since the independent member is held in the molding position by mutual restraint with the inner member until the completion of compression, there is no fear of impairing the molding at all.

On the other hand, after the completion of compression, when the fitting points of the clearances provided between the inner member and the inner member coincide with each other due to the advance lowering of the inner member in the direction of the press spindle, the independent member slides in the direction perpendicular to the press spindle to move the core. Can be retracted to the axial center side,
By this retreat, the concave or convex portion of the independent member is completely removed from the molded product, and the molded product can be taken out in the direction of the main axis of the press, which was impossible with the conventional apparatus.

Next, the independent member retracted to the axial center side and left inside the molded product is driven by the elevating means and lowered to a position where it can be pulled out from the molded product like the inner member. Therefore, there is no restriction on the lateral movement of the molded product, and it becomes possible to select an efficient take-out direction.

〔Example〕

 1 to 6 show an embodiment of the present invention.

The die 1 and wedge 13 shown in FIG.
The upper punch 2 is fixed to the upper ram of the press. Further, the yoke plate 25 connected to the die plate 24 and the lower ram is connected by a rod to move integrally as in the conventional device. The upper and lower rams of the press and the connecting rods of the plates 24 and 25 are not shown,
It is well known.

The lower punch 3 is fixed to a lower punch holder 10 fixed on the base plate 9. Further, the core arranged inside the lower punch is the outer core 4 located at the point symmetrical position.
The inner core 5 is divided into
The outer core 4 inserted into the cutout groove 5b on the outer periphery is supported at its lower end by an outer core holder 11 which also serves as a movement guide so as to be slidable in a direction perpendicular to the press spindle. A lifting pin 12, an adjusting plate 18, and an adjusting ring 7 that determine the top dead center of the outer core 4 are connected to the outer core holder 11. Further, as means for vertically moving and locking the outer core 4, a lifting pin 19, a support plate 23, and a reaction force are applied to the adjusting plate 18 to the base plate 9.
The cylinder actuator 16 received at is connected.
The fork 14 and the wedge 13 are used for positioning the outer core 4 at the compression point and for pulling it down therefrom. That is, during compression, the fork 14 blocks the descending path from the compression point of the outer core 4. Also, the wedge 13 is forked after compression.
Slide 14 sideways to retract from the above descent.

On the other hand, the inner core 5 is connected with an inner core retainer 21 and an adjusting ring 20 which determine the top dead center of the core. Further, a support plate 22 and a cylinder actuator 15 are connected to the inner core retainer 21 as a means for moving the inner core 5 up and down.

The outer core 4 is an independent member as referred to in the present application, and a molded product A ′ (third part) is formed on the outer peripheral surface of the powder molding part.
A convex portion 6 having a height dimension t for forming a concave surface is provided on the inner diameter side in the drawing.

Further, the outer core 4 and the inner core 5 are provided with mutual constraining surfaces 4a, 5a for keeping the outer core in the molding position at the compression completion position shown in FIG. Further, when the inner core 5 is lowered by a certain amount with respect to the outer core 4 between the cores 4 and 5, as shown in FIG. The relief portion 7 of the outer core is provided so as to fit in the height direction of the convex portion 6. The relation between the relief amount T (≦ T ′) of the outer core 4 and the above-mentioned t is T> t.

Reference numeral 8 is a propelling means for the outer core 4, which is composed of a spring, a cylinder actuator, etc., for urging the outer core 4 toward the axial center side of the inner core, and 26 is a fork 14 for the descending path of the outer core holder 11. It is a propulsion means including a spring, a cylinder actuator, and the like, which are shown in the figure, for returning to the blocking position.

 The operation of the exemplary molding apparatus will be described below.

As shown in FIG. 1, a space (cavity) created between the die 1, the lower punch 3, the inner core 5, and the outer core 4.
The powder material A is supplied into the inside, and thereafter, the upper punch 2 driven by the upper ram of the press is inserted into the cavity to start compression. Along with this compression, the die 1 and the cores 4 and 5 descend together, and when the upper punch 2 reaches the bottom dead center of FIG. 3, the outer core 4 also descends to the fork 14, and the compression is completed at this position. After that, when the die 1 is further lowered, the wedges 13 hanging down from the die plate 24 are simultaneously lowered to push the forks 14 sideways as shown in FIG. 4 to retract the outer core holder 11 from the descending path. Die 1 at this point
Descent is complete. After this, the cylinder actuator 15
When the inner core 5 is lowered together with the support plate 22 by moving the shoulder portion 7 ″ of the inner core to the position of the shoulder portion 7 ′ of the outer core 4, the force of the propulsion means 8 causes the core 4 to move to the T position.
Is retracted to the axial center side of the inner core, and as shown in FIG. 4, the apex of the convex portion 6 moves to the inside of the inner diameter of the molded product A ′. On the other hand, during this time, the outer core 4 locks the cylinder actuator 16 at the same time when the inner core 5 descends and fixes the cylinder actuator 16 so as not to move vertically. Thereafter, as shown in the figure, the plate 22 hits 23, and at this time, the cylinder actuator 16 is unlocked. Cylinder actuator 15
Continues to push down the plate 22 after this. Therefore, the inner core 5 supported by the plate 22 and the plate
The outer core 4 supported by 23 moves together from the time when the plates 22 and 23 come into contact with each other, and descends while keeping the outer core 4 retracted to the axial center side, as shown in FIG. Completely exit from A '. When this state is reached, a molded product A'having a plan view shape as shown in FIG. 6 can be taken out in any direction except the lower part. FIG. 6a shows a concave surface on the inner diameter side of the molded product.

After the molded product A'is taken out, the inner and outer cores 4 and 5 are raised to their original positions by the cylinder actuators 15 and 16, respectively, and then the die 1 is raised to the original position. When the die 1 starts to rise, the wedge 13 with which it is moving disengages from the fork 14 and thus the fork
The force of the propelling means 26 also returns 14 to the position where it blocks the descending path of the outer core holder, whereby the preset state for powder supply is reproduced.

If the propelling means 8 has both push and pull mechanisms, the shoulders 7'and 7 "need not be inclined surfaces.

Further, if the recess of the escape portion 7 on the outer core 4 side is made large enough to receive the upper end of the inner core 5, the shoulder portion 7 ″ can be omitted.
Since the gap between the cores 5 is in the two-stage sealing state at the preset position, it is difficult for the powder material to enter between both cores, and the mold can be moved smoothly.

In addition, the adjusting rings 17 and 20, the adjusting plate 18 and the inner core retainer 21 screwed to them adjust the powder material filling amount of the cavity by changing the heights of the inner and outer cores 4 and 5 with respect to the lower punch 3. If necessary, it is provided as an adjusting means.

Further, depending on the shape of the molded product, a plurality of lower punches may be provided and the above-mentioned independent member may be configured by a part of the lower punch. In this case, another lower punch may be interposed between the independent lower punch and the central core, but at that time, the position constraining surface and the relief portion at the compression completion point of the independent lower punch are connected to the central core. It is provided between the punch and the intervening lower punch.

〔effect〕

As described above, according to the present invention, the core or the lower punch having a concave or convex surface on the inner diameter side of the molded product is partially made independent, and at the compression completion position, the independent member is constrained by the inner member to be molded. Position, and after compression is completed, use the relief parts that fit with each other by relative movement in the direction of the press main axis to retract to the core axis side until the molded product can be taken out. Since it is held and the independent member is completely pulled out from the inside of the molded product,
It becomes possible to mold a tubular member having a concave surface or a convex surface on the inner diameter side by using an existing press machine. Further, at the same time, the restriction on the lateral take-out of the molded product is also removed, that is, the molded product can be taken out in a direction with good work efficiency by using a take-out device having a simple structure with no function,
It is possible to improve productivity by speeding up the take-out work and by making the work from molding to take-out continuous.

Although most of the molded parts are cylindrical, the present invention can also be applied to a molding device for non-cylindrical cylindrical parts.

[Brief description of drawings]

FIG. 1 is a front perspective view showing a simplified example of the device of the present invention, FIG. 2 is a plan view of a core and a die, FIG. 3 is a sectional view showing a completed state of compression, and FIG. 4 is an outer. FIG. 5 is a sectional view showing a retracted state of the core, FIG. 5 is a cross-sectional view showing a state in which the outer core is pulled out, FIG. 6 is a plan view of a molded product obtained by the exemplified device, and FIG. 7 and FIG. Japanese Patent Application Sho 62-32203
FIG. 4 is a cross-sectional view of the apparatus of No. 1) when compression is completed and when the outer core is retracted. 1 ... Die, 2 ... Top punch, 3 ... Bottom punch, 4 ... Outer core, 5 ... Inner core, 4a, 5a ... Mutual restraint surface, 5b ... Notch groove, 6 ... Convex part , 7 ... Relief part, 8, 26 ... Propulsion means, 9 ... Base plate, 10 ... Lower punch holder, 11 ... Outer core holder, 12, 19 ... Lifting pin, 13 ... Wedge, 14 ... Fork, 15, 16 …… Cylinder actuator, 17,20 …… Adjustment ring, 18 …… Adjustment plate, 21 …… Inner core retainer, 22,23 …… Support plate, 24 …… Die plate, 25 …… Yoke plate .

Claims (3)

(57) [Claims] 1. A die for creating a cavity, a top and bottom punch,
In a powder molding apparatus equipped with a core, etc., a part of the core or the lower punch arranged in the same direction as the press main shaft is independently supported so as to be movable in the press main shaft direction and the direction perpendicular thereto, and the powder of this independent member Provided on the outer periphery of the molded portion is a convex portion or a concave portion having a surface corresponding to the inner diameter side of the molded product,
The mutual restraining surface that keeps the independent member in the molding position at the compression completion position, and the fitting depth at which the mutual position is matched by the relative movement in the press main axis direction are the uneven portions. Of the independent member, which is larger than the height or depth of the independent member, toward the core axis side of the independent member, and blocks the descending path from the compression completion position of the independent member between the independent member and the base plate. The fork and the die plate that moves integrally with the yoke plate are each provided with wedges for retracting the fork from the descending path after completion of compression, and the independent member and the member inside thereof are individually molded products. A powder molding apparatus, characterized in that the powder molding apparatus is connected to an elevating means capable of descending to an extraction position. 2. The powder molding according to claim 1, wherein a support member independent of the yoke plate is connected to the core and the independent member, and the elevating means is installed between the support member and the base plate. apparatus. 3. The powder molding apparatus according to claim 1, further comprising means for propelling the independent member in a direction perpendicular to the main axis of the press.