JP5493141B2 - Deburring method and apparatus for powder molded parts - Google Patents

Description

  The present invention relates to a molded product (hereinafter referred to as “intermediate product”) in compression molding of powder, which is the first half of a process for producing a cemented carbide chip, a precision machine part or the like by compression molding and firing a fine powder of metal, ceramics, etc. The present invention relates to a deburring method and apparatus for a powder molded part that removes “burrs (protruding portions)” generated in the above.

  A fine powder such as metal and ceramics is mixed with a binder such as wax and filled in a mold of a press machine, and compression molded to produce a molded product (intermediate product). Manufacturing cemented carbide chips for processing, precision machine parts, and the like are performed. At the time of this compression molding, the pressure acting on the fine powder causes the fine powder to protrude into a slight gap around the mold, and a protruding portion called “burr” is generated. Since this is an unnecessary and harmful part of the product, it is necessary to remove it immediately after compression molding.

Patent Document 1 describes that after compression molding, the intermediate product is deburred (according to the same document, the burr is called “flushing”) by a “burr removal device” provided in the press. . This “deburring device” is a hollow cylinder attached to the upper head of the press machine, and its inside is connected to a vacuum source and an air supply source, and pulsates around the intermediate product after molding. A stream of air is blown off to separate the flashes, which are then sucked out and removed by a vacuum.
Special table 2001-502238 gazette

  The deburring device described in Patent Document 1 has a rather complicated configuration such as incorporating a turbine blade rotor to generate pulsation in the air flow, which not only increases the cost but also reduces the size of the device. Because it is difficult, it cannot be applied unless the dimensions of the mold and intermediate product are large to some extent. In addition, since it only affects the outer periphery of the intermediate product surrounded by the deburring device, there are problems such as not being able to remove all the flashes when multiple intermediate products are compression molded together. Yes.

  An object of the present invention is to realize a deburring method and apparatus for a powder molded part which has a simpler structure and can be easily reduced in size.

In the first aspect of the present invention, an upper punch and a lower punch are arranged above and below the die, a powder is filled in a space formed by the lower punch and the die, and the upper punch is lowered to compress the powder. In the powder forming press machine that is formed into an intermediate product, after the compression and molding, the die is retracted from the periphery of the intermediate product while the intermediate product is held between the upper punch and the lower punch, and the brush row is raised from the outside. A powder-molded part that is brought close to the outer surfaces of the punch and the lower punch, and that the intermediate belly portion of the brush is brought into contact with the intermediate product to remove the “burrs” protruding from the upper punch or the lower punch. Deburring method.

The present invention according to claim 2 is a method for deburring a powder molded part according to claim 1, wherein air is sprayed along the brush to vibrate the brush and blow away the removed powder. .
According to the third aspect of the present invention, the upper punch and the lower punch are arranged above and below the die, the powder is filled in the space formed by the lower punch and the die, and the upper punch is lowered to compress the powder. in powder molding press to an intermediate product by molding, in the vicinity of the upper punch and the lower punch, with placing capable brush rows closer to the outer surface of the upper punch and lower punch in a state of being retracted die, this Deburring a powder molded part, characterized in that an intermediate belly part of a brush in a brush row is brought into contact with the intermediate product, and an air pipe and an ejection hole for injecting air along the brush are provided in the brush row. Device.

  According to the present invention, even in the case of a mold having a small size, there is an excellent effect that it is possible to efficiently remove the dust without scattering dust around and to improve the quality of the powder molded product.

  Embodiments of the present invention will be described with reference to the drawings. First, the operation of the powder forming press according to the present invention will be described with reference to FIG. In FIG. 1, 1 is a die (mortar) of a press machine, 2 is an upper punch, 3 is a lower punch, upper punch 2 and lower punch 3 are arranged above and below the die 1, and as shown in FIG. The powder P is filled in the space formed by the die 1. Next, as shown in (b), the upper punch 2 descends to compress the powder, and an intermediate product G is formed. Subsequently, the die 1 is lowered, or the upper punch 2 and the lower punch 3 are raised while holding the intermediate product G. Thus, the contour portion of the intermediate product G appears at the top of the die 1.

FIG. 2 is an enlarged explanatory view at the compression molding stage corresponding to FIG. As an example, the width of the upper punch 2 and the lower punch 3 in this figure is 1.8 to 8.2 mm, and the gap g with the die 1 is 5 to 10 μm on one side. The fine powder enters the gap by the pressure during compression molding, and the flash F is formed.
FIG. 3 is a partial perspective view showing a brush row 4 as a main part of a deburring device according to an embodiment of the present invention, FIG. 4 is a front view, 41 is a brush (hair) for each brush row, and 42 is a brush holder. , 43 are brush pressers. That is, this brush row 4 has a structure in which a brush such as nylon is applied to a brush holder having a concave groove in the lower part and is fastened and fixed by a brush presser 43 from below, and brushes 41 that are opened in an eight-letter shape are arranged side by side. Yes. The brush 41 may have such a thickness by twisting or weaving fibers such as nylon having a diameter of about 0.1 to 0.15 mm, or finer fibers. Further, the brush holder 42 is provided with holes 44 and 45 through which compressed air is ejected. In FIG. 4, the hole 44 opens directly above the brush 41, but the hole 45 opens at the portion where the brush 41 is aligned. ing. By injecting air from these holes, the brush 41 is vibrated finely, and the deburring effect is enhanced, and at the same time, it can be expected that the removed fine powder is blown away.

  FIG. 5 is a plan view showing a deburring situation in the embodiment, FIG. 6 is a front view, 5 is an air nozzle, and 6 is a duct. In this example, the mold represented by the upper punch 2 has a rectangular shape, and the same one is arranged in a plurality of rows. On the other hand, a plurality of rows of brush rows 4 are arranged so as to enter the middle of each of the above-mentioned molds, and as shown by an arrow b in FIG. 6, the whole moves so that the brush 41 contacts the side surface of the die. .

  FIG. 7 is an explanatory view of the mold part at this time, and the positional relationship between the die 1 and the upper and lower punches 2 and 3 corresponds to (c) in FIG. As shown in this figure, in the present invention, the brush 41 does not prick the intermediate product at its tip, but contacts at the middle belly part and peels off the flash part by fine vibration. The brush 41 extends as shown by a broken line in a free state, but enters the position of the mold and bends as shown by a solid line.

On the other hand, as shown in FIGS. 5 and 6, the peeled fine powder is collected in the direction of arrow a without being scattered around by the air flow from the air nozzle 5, and is collected through the duct 6.
As described above, even when the intermediate product has a small size and a plurality of the intermediate products are compression-molded together, the brush rows 4 can be made into a plurality of rows in the same manner, so that the deburring can be performed collectively.

  FIG. 8 is a plan view of a brush portion in a modified embodiment. If the mold or intermediate product has a polygonal cross section such as a triangle, hexagon, or star, the burr is generated mainly at the corner, so the brush may be brought into contact with the corner from the outside. Therefore, as shown in FIG. 8, a brush holder 42a is formed so as to surround the mold and the intermediate product G, and the brush 41 is planted in a slightly oblique direction instead of the center. In this case, the brush holder 42a may be disposed, for example, on the upper part of the mold, and may be lowered and / or rotated as necessary.

It is explanatory drawing explaining the action | operation of the metal mold | die part of the powder shaping press machine concerning this invention. FIG. 2 is an enlarged explanatory diagram in one stage of FIG. 1. It is a fragmentary perspective view of the brush row | line which is the principal part of this invention Example. It is a front view of the brush row | line which is the principal part of this invention Example. It is a top view explaining the deburring situation in the example of the present invention. It is a front view explaining the deburring situation in the embodiment of the present invention. It is a front view of the metal mold | die part explaining the deburring condition in this invention Example. It is a top view of the brush in this invention modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Die 2 Upper punch 3 Lower punch 4 Brush row 5 Air nozzle 6 Duct 41 Brush 42, 42a Brush holder 43 Brush retainer F Beam G Intermediate product P Fine powder

Claims (3)

The upper punch and below the die, and place the lower punch, the powder was filled into the space formed by the lower punch and the die, compressed by lowering the upper punch from above, molding powder molding press to obtain an intermediate product in the compression, after molding, and the intermediate product on the punch, it is retracted die while holding between the lower punch from the periphery of the intermediate product, to approximate the brush rows from the outside to the outer surface of the upper punch and the lower punch, this A deburring method for a powder molded part, characterized in that an intermediate belly part of a brush is brought into contact with the intermediate product to remove “burrs” protruding from the upper punch or lower punch. The method for deburring a powder molded part according to claim 1, wherein air is sprayed along the brush to vibrate the brush and to blow away the removed powder. The upper punch and below the die, and place the lower punch, the powder was filled into the space formed by the lower punch and the die, compressed by lowering the upper punch from above, molding powder molding press to obtain an intermediate product in the near of the upper punch and the lower punch, with placing capable brush rows closer to the outer surface of the upper punch and lower punch in a state of being retracted die, a portion of the intermediate belly brush the brush rows An apparatus for deburring a powder molded part, characterized in that an air pipe and an ejection hole are provided in the brush row so as to be brought into contact with an intermediate product and eject air along the brush .

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