JPH06592U - Powder molding equipment - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose of the present invention is to make the packing density uniform in any case in a powder molding apparatus in which the raw material of the powder P is filled with a feeder. [Constitution] In a powder molding apparatus in which a raw material of powdery or granular material is filled into a us by a feeder and press-molded, a pressure molding mechanism is provided above the inside of the feeder to uniformly fill the raw material.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a powder compacting device, and more particularly to a powder compacting device that press-molds a powder compact using a raw material of powder granules obtained by kneading a ceramic powder or glass powder and a binder.

[0002]

[Prior art]

 As a powder molding apparatus for forming a molded body by using a raw material of powdery or granular material in which a ceramic powder or glass powder and a binder are kneaded, the one shown in FIG. is there. The substrate 101 shown in FIG. 3 has a hole 102 recessed in the center. In the powder molding apparatus of FIG. 4 for processing this, a lower punch 104 for processing the hole 102 of the substrate 101 in the center of the usher 103, and a lower sliding punch 105 fitted on the lower punch 104 and slidably provided. Is provided. Opposed to the lower punch 104 and the lower sliding punch 105, there is an upper punch 107 which is fitted in the cylinder 106 and is provided so as to be movable up and down. A feeder 108 for supplying the raw material powder particles P is slidably provided on the cable 103 between the us 103 and the lower punch 104 / lower sliding punch 105, and the powder particles are provided above the feeder 108. The supply pipe 109 of the body P is connected.

FIG. 4A shows a state in which the lower punch 104 and the lower sliding punch 105 are located below, and the powder particles P are supplied thereto by the feeder 108, and the powder particles P are filled in a mold. Is. Next, in FIG. 4 (b), the feeder 108 is slid into a slidable state, and a predetermined amount of the powder P is filled in the mold. Subsequently, as shown in FIG. 4 (c), the upper punch 107 drives the cylinder 106 to move it down, pressurizing the powder granules P, and forming the compact F.

As shown in FIG. 4 (d), the lower punch 104 and the lower sliding punch 105 are raised until they are located on the upper surface of the us 103, and the compact F is positioned on the upper surface of the us 103. Make a payment. As shown in FIG. 4 (e), the feeder 108 is slid on the head 103 to eject the molded body F, and the lower punch 104 and the lower sliding punch 105 are moved in the same manner as described in FIG. 4 (a). At the lower position, the powder particles P are filled in the mold again, and the molding product F 1 is produced by repeating the same process.

[0005]

[Problems to be solved by the device]

 The granular material obtained by kneading the ceramic powder or the glass powder and the binder is supplied into the mold from the supply port of the feeder 108, but the opening area of the feeder 108 is larger than the cross-sectional area of the supply pipe 109. It is difficult to uniformly fill the recesses formed by the lower punch 104 and the lower sliding punch 105. Further, in the shadow of the lower punch 104 protruding into the recess, the flow resistance becomes large and the packing density is not uniform in many cases. That is, the filling density is small in the shadow of the lower punch 104, the so-called green density when formed into a molded body is small, and the shrinkage amount is large due to the small green density after firing, which is a serious problem. It is a cause of poor quality.

Further, the packing density must be made as uniform as possible, but it is greatly restricted by the filling timing, and the restriction is particularly large when the rotational speed of the press is increased. Furthermore, in the case of a molded product having a complicated shape, it is difficult to make the packing density uniform.

[0007]

[Means for Solving the Problems]

 Therefore, in view of the above circumstances, the present invention provides a powder molding apparatus in which the raw material of the powder or granular material is filled into a us by a feeder and press-molded in order to make the packing density uniform in any case. This is a powder molding machine equipped with a pressure mechanism to uniformly fill the raw materials.

[0008]

[Action]

 An up-and-down pressure plate is provided above the inside of the feeder, and after the powder material is filled in the mold, pressure is applied by the pressure plate, resulting in a uniform packing density.

[0009]

【Example】

 The present invention will be described in detail below based on specific embodiments shown in the accompanying drawings. Also in this example, an example of processing the substrate 101 in which the hole 102 shown in FIG. 3 is provided will be described. In the powder molding apparatus shown in FIG. 1, a lower punch 4 for processing the hole 102 of the substrate 101 and a lower slide punch 5 fitted on the lower punch 4 so as to be slidable are provided in the center of the uss 3. There is a mark. Opposed to the lower punch 4 and the lower sliding punch 5, there is an upper punch 7 which is fitted in a cylinder 6 and is provided to be movable up and down. A feeder 8 for supplying the raw material powder P is provided between the us 3 and the lower punch 4 / lower sliding punch 5 on the us 3 in a sliding manner. A supply pipe 9 for the granules P is connected.

A pressure plate 11 is provided above the center of the inside of the feeder 8. As shown in detail in FIG. 2, the pressure plate 11 is fixed to the tip of the actuating rod 12 that projects to the outside of the feeder 8. An electromagnetic coil 13 is wound around the actuating rod 12, and the pressure plate 11 is lowered to pressurize the granular material P when energized. When the coil spring 15 is contracted on the seat plate 14 side at the base end of the operating rod 12 and the electromagnetic coil 13 is not energized, the pressing plate 11 is moved upward by the urging force of the coil spring 15. positioned. Reference numeral 16 is a seal ring which maintains airtightness between the actuating rod 12 and the feeder 8. Such an electromagnetic lifting type pressure plate 11 has a high response speed and a small amount of fluctuation, so that uniform filling can be performed.

FIG. 1A shows a state in which the lower punch 4 and the lower sliding punch 5 are located below, and the powder particles P are supplied to the feeder 8 by the feeder 8 and the powder particles P are filled in a mold. is there. At this position, the pressing plate 11 is energized by the energizing coil 13 to pressurize the powder P. Next, in FIG. 1 (b), the pressure plate 11 is kept at the lower limit and the feeder 8 is slid into a state of being slid to fill the mold with a predetermined amount of the powder P.

Subsequently, as shown in FIG. 1 (c), the upper punch 7 drives the cylinder 6 to move it downward to pressurize the powder P to form a compact F. At this time, the pressing plate 11 is positioned at the upper limit due to the urging force of the coil spring 15 because the current to the energizing coil 13 is cut off. As shown in FIG. 1 (d), the lower punch 4 and the lower sliding punch 5 are lifted until they are located on the upper surface of the uss 3, and the compact F is located on the upper surface of the uss 3, and the compact F is discharged. . The pressure plate 11 is also at the upper limit position here.

Subsequently, as shown in FIG. 1 (e), the feeder 8 is slid on the uss 3 to eject the compact F, and the lower punch 4 / The lower slide punch 5 is positioned below, the powder P is filled in the mold, and the molding F is repeated in the same manner. Here, the size of the pressure plate 11 used is preferably 1.5 to 2 times the area of the molded body F. However, in some cases, the area may be smaller than the area of the molded body F, and the pressure may be applied in spots.

Further, the lifting stroke of the pressure plate 11 is preferably 0.5 to 1.8 times the thickness of the molded body F. Here, the pressure plate 11 is moved up and down by an electromagnetic method, but it is also possible to use a mechanical method, hydraulic pressure, pneumatic pressure, or another method. For example, when pneumatic pressure is used, the pressure plate may be moved up and down by an air cylinder using jet air.

A rectangular substrate having a recess at the center and a width of 14.20 mm in the advancing direction of the feeder 8 is processed by a powder molding apparatus provided with the pressure plate 11 of the present invention and a conventional powder without the pressure plate 11. Table 1 below shows the results when compared with those processed with a molding machine.

[0016]

[Table 1]

From the above results, it can be seen that the powder molding apparatus of the present invention provided with the pressure plate has better processing accuracy at any rotation speed than the processing by the conventional powder molding apparatus having no pressure plate. In the present invention, it has been proved that the machining accuracy is good even if the rotation speed is increased.

[0018]

[Effect of device]

 As described above, the present invention is a powder molding apparatus in which the raw material of the powder or granular material is charged into the us by the feeder and press-molded, and the powder molding is provided with a pressurizing mechanism to uniformly fill the raw material inside the feeder. Since it is a device, when filling the raw material of the powder body, the filling density in the shadow of the mold can be made uniform as it is in other parts, and a high-quality molded body can be obtained.

Further, according to the present invention, it is possible to obtain a molded product which is of an electromagnetic type and has a fast response speed and a small variation amount and a substantially uniform size. Further, in the present invention, while the conventional powder molding apparatus controls the filling amount at the timing of the feeder, it can be adjusted by controlling the pressure plate. That is, it is possible to cope with rough timing control of the feeder.

Furthermore, the present invention can prevent the occurrence of cracks during debinding as much as possible. Further, according to the present invention, since the packing density is increased by pressing with the pressing plate, it is possible to easily press-mold even a molded body having a complicated shape.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a processing step of a powder compact provided with a pressure plate according to a specific embodiment of the present invention.

FIG. 2 is a vertical sectional view of a main part of a feeder provided with a pressure plate according to the present invention.

FIG. 3 is a vertical cross-sectional view of a substrate.

FIG. 4 is a vertical cross-sectional view illustrating a processing sequence of a conventional powder molding device.

[Explanation of symbols]

 1 ... Feeder P ... Granule 11 ... Pressure plate

Claims (1)

[Scope of utility model registration request] 1. A powder molding apparatus in which a raw material for powdery or granular material is filled into a us by a feeder and press-formed, and a powder molding apparatus is provided above the inside of the feeder so as to uniformly fill the raw material.