JPH106091A - Production of green compact - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for efficiently removing burr which is generated caused on the clearance between a male die and a female die on a green compact obtained by compacting a powder for forming using the female die and the male die. SOLUTION: After compacting a green compact 10, when it is transferred to the next process along a transferring passage 20, a burr 17 is removed. Therefore, a transferring face 22 of making in contact with a face crossing part formed with the burr 17 of the green compact 17 is installed on the transferring passage 20. The transferring face 20 has preferably a V-shaped cross-section. Further, when the green compact 10 is a circular disk-like, the green compact 10 is moved while rolling in the attitude of its main face 14, 15 toward the side direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a powder press molded product, and more particularly to a method for removing burrs that may be formed on a powder press molded product after press molding. The present invention relates to a method for producing a body press molded product.

[0002]

2. Description of the Related Art For example, a ceramic electronic component element or a drug pellet is often manufactured through a powder press molding process.

FIG. 6 shows several steps involved in a method of manufacturing a powder press molded product by powder press molding.

[0006] As shown in FIG. 6 (1), a molding powder 3 is loaded into a molding cavity 2 formed in a female mold 1. At this stage, the upper surface of the molding cavity 2 is open. The bottom surface of the molding cavity 2 is closed by a lower mold 4 that can move in the vertical direction, and the volume of the molding cavity 2 is determined by the position of the lower mold 4.

[0005] Next, as shown in FIG.
Moves along the upper surface of the molding cavity 2 as shown by an arrow 6 to remove the excess molding powder 3. As a result, a predetermined amount of the molding powder 3 remains in the molding cavity 2.

Next, as shown in FIG. 6 (3), the male mold 7 is inserted into the molding cavity 2 from above, and the male mold 7 is further moved downward in the molding cavity 2 so that the male mold 7 is moved downward. The mold 7 and the lower mold 4 exert a pressing action on the molding powder 3 as shown by arrows 8 and 9. Thereby, the powder press-formed product 10 is obtained.

Next, after the male mold 7 is returned so as to escape from the molding cavity 2, the lower mold 4 is moved upward as shown by an arrow 11, as shown in FIG. Then, the powder press-formed product 10 is pushed out of the molding cavity 2. At this time, the upper surface of the lower mold 4 is brought to almost the same height position as the upper surface of the female mold 1.

[0008] Next, as shown in FIG.
2 acts in the direction indicated by the arrow 13 so that the powder press-formed product 10 is removed from the female mold 1 and then conveyed to the next step.

The above-described steps shown in FIGS. 6 (1) to 6 (5) are performed as a series of operations in, for example, a rotary press.

[0010]

FIG. 7 is an enlarged view of the powder press-formed product 10 obtained as described above. FIG. 7 shows a half of the powder press-formed product 10 in a perspective view.

[0011] As shown in FIG.
Is, for example, a disk having two opposing main surfaces 14 and 15 and a cylindrical peripheral surface 16. In many cases, burrs 17 are formed on the powder press-formed product 10 particularly at the intersections where the upper principal surface 14 and the peripheral surface 16 intersect. Since such burrs 17 are caused by the clearance between the female mold 1 and the male mold 7, a clearance is also formed between the female mold 1 and the lower mold 4; At the stage of press forming as shown in (3), not only the plane intersection where the upper main surface 14 and the peripheral surface 16 intersect, but also the surface intersection where the lower main surface 15 and the peripheral surface 16 intersect. May also be formed. However, as shown in FIG. 6 (5), when the female mold 1 is removed, the lower burr is almost removed, and only the upper burr 17 is left.

Since such burrs 17 may hinder the subsequent handling of the powder press-formed product 10, it must be removed before supplying the powder to the next step. Therefore, conventionally, a step of removing the burrs 17 by a method such as brushing or barrel polishing has been performed before being sent to the next step.

However, burr 1 due to brushing
Removal of 7 has many manual factors and is poor in productivity. On the other hand, in the case of barrel polishing, the powder press molded product 10
In many cases, cracking or chipping occurs relatively, and it is not so easy to stabilize the quality of the powder press-formed product 10.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a powder press-formed product having a deburring step capable of solving the above-mentioned problems.

[0015]

SUMMARY OF THE INVENTION According to the present invention, a molding powder is charged into a molding cavity formed in a female mold, and the male mold is operated in the molding cavity to form the molding powder. Exerting a pressing action on the powder press-formed product, thereby obtaining the powder press-formed product, and transporting the powder press-formed product to the next step, comprising: In order to solve the above technical problem, the present invention is characterized by having the following configuration.

That is, the step of transporting includes a step of moving the powder press-formed product along the transport path, and the transport path removes burrs formed at the plane intersections of the powder press-formed product. As described above, a transport surface that comes into contact with the surface intersection is provided.

The present invention is particularly advantageously applied when the powder press-formed product is a disk having two opposing main surfaces and a cylindrical peripheral surface. In this case, in the transporting step, the powder press-formed product is configured to move while rolling with the two main surfaces facing sideways.

In the present invention, preferably, the transfer surface includes a portion providing a substantially V-shaped cross section,
In the transporting step, the powder press-formed product is moved while the intersections of two planes at opposing positions are in contact with the transport surface.

Further, in the present invention, the transport surface may include:
It may include a portion provided by the peripheral surfaces of two rollers extending parallel to each other and arranged side by side.
In this case, the two rollers are rotated in a direction in which the respective peripheral surface portions of the two rollers opposing each other move upward, and in the transporting step, the powder press-molded product is placed at the opposing position. Are moved in contact with the peripheral portions of the two rollers facing each other.

In the present invention, it is preferable that the transferring step is continuously performed after the step of obtaining the powder press-formed product is completed.

[0021]

FIG. 1 is a schematic front view mainly showing a conveying step included in a method of manufacturing a powder press-formed product according to an embodiment of the present invention.

FIG. 1 shows a disk-shaped powder press-formed product 10 removed from the female mold 1 in the step of FIG. 6 (5) described above. The powder press-formed product 10 is transported to the next step (not shown) via the first and second transport paths 19 and 20 in sequence as indicated by an arrow 18. The first and second transport paths 19 and 20 are arranged in an inclined state so that the movement of the powder press-formed product 10 is basically caused by gravity acting on itself.

The first transport path 19 includes a chute 21. When the chute 21 is twisted, the powder press-formed product 10 turns the main surfaces 14 and 15 sideways from a posture in which the main surfaces 14 and 15 are turned in the vertical direction. Changed to posture. In the first transport path 19, the illustration of the wall surfaces formed on both sides of the chute 21 is omitted.

The powder press-formed product 10 is sent to the second transfer path 20 with the main surfaces 14 and 15 facing sideways. A part of the second transport path 20 is shown in a perspective view in FIG. FIG. 3 is a sectional view taken along line III-II in FIG.
It is sectional drawing which follows I.

The second transport path 20 forms a transport surface 22 that provides a V-shaped cross section. This transport surface 22
Is formed by a pair of bottom rails 23 and 24. A pair of side rails 25 and 26 are arranged above the transport surface 22 at a predetermined interval.

In the second transport path 20, the powder press-formed product 10 moves while rolling with the main surfaces 14 and 15 directed sideways. This rolling movement,
As shown in FIG. 2, the second transport path 20 is disposed with an appropriate inclination angle 27 so as to be generated by gravity acting on the powder press-formed product 10 itself. Further, in order to maintain the posture in which the main surfaces 14 and 15 of the powder press-formed product 10 are directed sideways, the above-described side rail 2 is used.
5 and 26 are working.

As described above, when the powder press-formed product 10 moves along the second transport path 20, as shown in FIG. It comes into contact with the letter-shaped transport surface 22. Therefore, the burrs 17 formed at one of the intersections are advantageously removed while contacting the transfer surface 22. Even if burrs 17 are formed at both intersections of the planes, these burrs can be advantageously removed while contacting the transfer surface 22.

In order to enhance the effect of removing the burrs 17 described above, the bottom rails 23 and 24 or the second transport path 2
0 may be vibrated by a vibrator or the like, or the transfer surface 22 may be provided with an uneven surface.

The conveying surface 22 described above is not limited to a form in which two flat surfaces are arranged in a V-shape, as shown in the figure. May be changed to a form in which, for example, two convexly or concavely curved surfaces are arranged in a V shape.

FIG. 4 shows another embodiment of the present invention.
FIG. 3 is a diagram corresponding to FIG. 2. Second transport path 2 shown in FIG.
0a are 2 extending parallel to each other and arranged side by side
It is constituted by two rollers 28 and 29. FIG.
FIG. 5 is a view in the direction of the arrow V in FIG. 4.

The transport surface 30 provided on the second transport path 20a
Is provided by the peripheral surfaces of the rollers 28 and 29.
As shown by arrows 31 and 32, these rollers 28 and 29 are rotated in a direction in which the peripheral portions facing each other move upward.

In the second transport path 20a, the powder press-formed product 10 moves while rolling with the main surfaces 14 and 15 directed sideways. In order that this rolling movement is caused by the gravity acting on the powder press-formed product 10 itself, the second transport path 20a is arranged with an appropriate inclination angle 33 as shown in FIG.
In order to maintain the main surfaces 14 and 15 of the powder press-formed product 10 in the lateral direction, as shown by imaginary lines in FIG. A pair of guide rails 34 and 35 may be arranged at an interval.

As described above, when the powder press-formed product 10 moves along the second transport path 20a, as shown in FIG.
A contact surface 30 provided by opposing peripheral portions of the two rollers 28 and 29. Therefore,
The burrs 17 formed at the intersections are advantageously removed while contacting the transport surface 30. At this time, since the rollers 28 and 29 are rotating, the conveying surface 30 moves in a direction intersecting with the moving direction of the powder press-formed product 10. Therefore, the frequency of contact between the burrs 17 and the transfer surface 30 is increased, and the effect of removing the burrs 17 per unit movement distance of the powder press-formed product 10 can be enhanced. Note that, as described above, the rollers 28 and 29
As shown by 1 and 32, the opposing peripheral surface portions are both rotated in the direction of moving upward, so that the powder press molded product 10 does not bite between the rollers 28 and 29.

Although the present invention has been described with reference to the illustrated embodiment, various other modifications are possible within the scope of the present invention.

For example, in order to move the powder press-formed product along the transport path, in the illustrated embodiment, the transport paths 19 and 20 or 20a are inclined to use the gravity acting on the powder press-formed product 10 itself. But instead,
Alternatively, in addition to this, means for forcibly sending the powder press-formed product may be used.

When the powder press-formed product 10 handled in the above-described embodiment becomes a body for an electronic component, it is subsequently fired to form electrodes on the surface. At the stage after the molded article 10 is fired, the burrs may be removed while being transported.

In the above-described embodiment, after the powder press-formed product 10 is obtained, it is immediately subjected to the transporting step, and the burrs 17 are removed in this transporting step. Instead, after obtaining the powder press-formed product 10, this is temporarily stored, and then, at another time, a transfer process to the next process is performed. In this transfer process, the burr 17 is removed. It may be performed.

In the above-described embodiment, the powder press-formed product 10 has a disk shape, but may have another shape such as a square plate shape. For example, in the case of a square plate-shaped powder press-formed product, it is difficult to move while rolling, but for example, by changing the direction during conveyance, it is necessary to bring all the intersections into contact with the conveyance surface. Therefore, the burr can be removed without any problem by changing the direction as needed.

[0039]

As described above, according to the present invention, when a powder press molded article is transported, the powder press molded article moves along the transport path, and the powder Since the transfer surface is provided so as to remove the burr formed at the intersection of the press-formed product, the transfer surface is provided so as to remove the burr formed at the intersection of the press-formed product.
Burrs are removed. Therefore, burrs can be efficiently removed without causing cracks or large chips that affect the quality. In addition, there is no need to provide a special step for removing burrs, and burrs can be removed in the transfer step to the next step, so that the steps can be simplified and the efficiency can be increased.

When the powder press-formed product is a disk having two opposing main surfaces and a cylindrical peripheral surface, the powder press-formed product is moved while rolling with the two main surfaces facing sideways. When the powder press-formed product is transported, the powder press-formed product can be transported smoothly, and the intersection of the burrs can be evenly brought into contact with the transport surface. Therefore, an operation such as changing the attitude of the powder press-formed product during the conveyance is not required in order to uniformly contact the intersection of the burrs with the conveyance surface. In addition, if the conveying path is inclined so that the powder press-formed product rolls due to the gravity acting on itself, the powder press-formed product can be manufactured without providing a special feed mechanism for moving the powder press-formed product. It can be moved along the transport path.

Further, the conveying surface includes a portion giving a substantially V-shaped cross section, and two plane intersections at opposing positions of the powder press-formed product come into contact with the V-shaped conveying surface. If it is made to move, these two intersections can be brought into contact with the transport surface at the same time, so that the burrs formed at these two intersections can be removed at the same time. Further, the degree of freedom with respect to the direction of the powder press molded article when moving the transport path is increased, and the process of arranging the powder press molded article supplied to the transport path can be simplified.

Further, the conveying surface includes a portion provided by the peripheral surfaces of two rollers extending parallel to each other and arranged side by side, and these two rollers have respective peripheral surface portions opposed to each other. Both are rotated in the direction of moving upward, and the powder press-formed product is moved so that the two surface intersection portions at the opposing positions respectively contact the opposing peripheral surface portions of the two rollers. Then, the powder press-formed product can be smoothly moved without being caught between the two rollers. Also,
Since the rotation of the roller is added to the movement of the powder press-formed product along the transport path, the frequency of contact of the peripheral surface of the roller, that is, the transport surface, with the plane intersection is increased. Therefore, the effect of removing burrs per unit moving distance of the powder press-formed product is increased, and the transport path for removing burrs can be shortened as necessary.

Further, if the conveying step is performed continuously after the step of obtaining the powder press molded article, the steps from the pressing step to the next step through the conveying step can be performed efficiently. You can proceed to.

[Brief description of the drawings]

FIG. 1 is a schematic front view mainly showing a transportation step included in a method for manufacturing a powder press-formed product according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a part of a second transport path 20 shown in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a view corresponding to FIG. 2, showing a second transport path 20a used in another embodiment of the present invention.

FIG. 5 is a view in the direction of arrow V in FIG. 4;

FIG. 6 is a powder press-formed product 1 of interest to the present invention.
FIG. 3 is an illustrative sectional view sequentially showing a process for obtaining 0.

7 is an enlarged perspective view showing a half of the powder press-formed product 10 obtained through the process shown in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Female mold 2 Molding cavity 3 Molding powder 4 Lower mold 7 Male mold 10 Powder press molded article 14, 15 Main surface 16 Peripheral surface 17 Burr 19, 20, 20a Transport path 22, 30, Transport surface 28, 29 Roller

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Masanobu Kishi 2-26-10 Tenjin, Nagaokakyo-shi, Kyoto Inside Murata Manufacturing Co., Ltd. (72) Inventor Mitsuru Nagashima 2-26-10 Tenjin, Nagaokakyo-shi, Kyoto Stock Company Inside Murata Manufacturing (72) Inventor Nobuyoshi Osuge 2-26-10 Tenjin, Nagaokakyo-shi, Kyoto

Claims (5)

[Claims] 1. A molding powder is loaded into a molding cavity formed in a female mold, and a male mold is operated in the molding cavity to exert a pressing action on the molding powder. A powder press molded article is thereby obtained, and the powder press molded article is transported to the next step. The method includes a step of moving a powder press-formed product, wherein the transport path includes a transport surface that comes into contact with the intersecting surface of the powder press molded product so as to remove burrs formed at the intersecting surface. A method for producing a powder press-formed product, characterized in that: 2. The powder press-molded product has two opposing surfaces.
The powder press-formed product has a disk shape having two main surfaces and a cylindrical peripheral surface, and in the transporting step, the powder press-formed product moves while rolling with the two main surfaces facing sideways. Item 2. A method for producing a powder press-formed product according to Item 1. 3. The conveying surface includes a portion providing a substantially V-shaped cross-section, and in the conveying step, the powder press-formed product is provided with two plane-intersecting portions located at opposing positions. The method for producing a powder press-formed product according to claim 1, wherein the member moves while contacting the transfer surface. 4. The conveying surface includes a portion provided by a peripheral surface of two rollers extending parallel to each other and arranged side by side, and the two rollers are each opposed to each other of the two rollers. In the transporting step, the powder press-molded product is formed such that two surface intersection portions located at opposing positions have the peripheral surfaces facing each other of the two rollers. The method for producing a powder press-formed product according to claim 1 or 2, wherein the method moves while contacting each of the portions. 5. The production of a powder press-molded article according to claim 1, wherein the step of carrying is performed continuously after finishing the step of obtaining the powder press-molded article. Method.